FFmpeg  4.3.3
avcodec.h
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1 /*
2  * copyright (c) 2001 Fabrice Bellard
3  *
4  * This file is part of FFmpeg.
5  *
6  * FFmpeg is free software; you can redistribute it and/or
7  * modify it under the terms of the GNU Lesser General Public
8  * License as published by the Free Software Foundation; either
9  * version 2.1 of the License, or (at your option) any later version.
10  *
11  * FFmpeg is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14  * Lesser General Public License for more details.
15  *
16  * You should have received a copy of the GNU Lesser General Public
17  * License along with FFmpeg; if not, write to the Free Software
18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19  */
20 
21 #ifndef AVCODEC_AVCODEC_H
22 #define AVCODEC_AVCODEC_H
23 
24 /**
25  * @file
26  * @ingroup libavc
27  * Libavcodec external API header
28  */
29 
30 #include <errno.h>
31 #include "libavutil/samplefmt.h"
32 #include "libavutil/attributes.h"
33 #include "libavutil/avutil.h"
34 #include "libavutil/buffer.h"
35 #include "libavutil/cpu.h"
37 #include "libavutil/dict.h"
38 #include "libavutil/frame.h"
39 #include "libavutil/hwcontext.h"
40 #include "libavutil/log.h"
41 #include "libavutil/pixfmt.h"
42 #include "libavutil/rational.h"
43 
44 #include "bsf.h"
45 #include "codec.h"
46 #include "codec_desc.h"
47 #include "codec_par.h"
48 #include "codec_id.h"
49 #include "packet.h"
50 #include "version.h"
51 
52 /**
53  * @defgroup libavc libavcodec
54  * Encoding/Decoding Library
55  *
56  * @{
57  *
58  * @defgroup lavc_decoding Decoding
59  * @{
60  * @}
61  *
62  * @defgroup lavc_encoding Encoding
63  * @{
64  * @}
65  *
66  * @defgroup lavc_codec Codecs
67  * @{
68  * @defgroup lavc_codec_native Native Codecs
69  * @{
70  * @}
71  * @defgroup lavc_codec_wrappers External library wrappers
72  * @{
73  * @}
74  * @defgroup lavc_codec_hwaccel Hardware Accelerators bridge
75  * @{
76  * @}
77  * @}
78  * @defgroup lavc_internal Internal
79  * @{
80  * @}
81  * @}
82  */
83 
84 /**
85  * @ingroup libavc
86  * @defgroup lavc_encdec send/receive encoding and decoding API overview
87  * @{
88  *
89  * The avcodec_send_packet()/avcodec_receive_frame()/avcodec_send_frame()/
90  * avcodec_receive_packet() functions provide an encode/decode API, which
91  * decouples input and output.
92  *
93  * The API is very similar for encoding/decoding and audio/video, and works as
94  * follows:
95  * - Set up and open the AVCodecContext as usual.
96  * - Send valid input:
97  * - For decoding, call avcodec_send_packet() to give the decoder raw
98  * compressed data in an AVPacket.
99  * - For encoding, call avcodec_send_frame() to give the encoder an AVFrame
100  * containing uncompressed audio or video.
101  *
102  * In both cases, it is recommended that AVPackets and AVFrames are
103  * refcounted, or libavcodec might have to copy the input data. (libavformat
104  * always returns refcounted AVPackets, and av_frame_get_buffer() allocates
105  * refcounted AVFrames.)
106  * - Receive output in a loop. Periodically call one of the avcodec_receive_*()
107  * functions and process their output:
108  * - For decoding, call avcodec_receive_frame(). On success, it will return
109  * an AVFrame containing uncompressed audio or video data.
110  * - For encoding, call avcodec_receive_packet(). On success, it will return
111  * an AVPacket with a compressed frame.
112  *
113  * Repeat this call until it returns AVERROR(EAGAIN) or an error. The
114  * AVERROR(EAGAIN) return value means that new input data is required to
115  * return new output. In this case, continue with sending input. For each
116  * input frame/packet, the codec will typically return 1 output frame/packet,
117  * but it can also be 0 or more than 1.
118  *
119  * At the beginning of decoding or encoding, the codec might accept multiple
120  * input frames/packets without returning a frame, until its internal buffers
121  * are filled. This situation is handled transparently if you follow the steps
122  * outlined above.
123  *
124  * In theory, sending input can result in EAGAIN - this should happen only if
125  * not all output was received. You can use this to structure alternative decode
126  * or encode loops other than the one suggested above. For example, you could
127  * try sending new input on each iteration, and try to receive output if that
128  * returns EAGAIN.
129  *
130  * End of stream situations. These require "flushing" (aka draining) the codec,
131  * as the codec might buffer multiple frames or packets internally for
132  * performance or out of necessity (consider B-frames).
133  * This is handled as follows:
134  * - Instead of valid input, send NULL to the avcodec_send_packet() (decoding)
135  * or avcodec_send_frame() (encoding) functions. This will enter draining
136  * mode.
137  * - Call avcodec_receive_frame() (decoding) or avcodec_receive_packet()
138  * (encoding) in a loop until AVERROR_EOF is returned. The functions will
139  * not return AVERROR(EAGAIN), unless you forgot to enter draining mode.
140  * - Before decoding can be resumed again, the codec has to be reset with
141  * avcodec_flush_buffers().
142  *
143  * Using the API as outlined above is highly recommended. But it is also
144  * possible to call functions outside of this rigid schema. For example, you can
145  * call avcodec_send_packet() repeatedly without calling
146  * avcodec_receive_frame(). In this case, avcodec_send_packet() will succeed
147  * until the codec's internal buffer has been filled up (which is typically of
148  * size 1 per output frame, after initial input), and then reject input with
149  * AVERROR(EAGAIN). Once it starts rejecting input, you have no choice but to
150  * read at least some output.
151  *
152  * Not all codecs will follow a rigid and predictable dataflow; the only
153  * guarantee is that an AVERROR(EAGAIN) return value on a send/receive call on
154  * one end implies that a receive/send call on the other end will succeed, or
155  * at least will not fail with AVERROR(EAGAIN). In general, no codec will
156  * permit unlimited buffering of input or output.
157  *
158  * This API replaces the following legacy functions:
159  * - avcodec_decode_video2() and avcodec_decode_audio4():
160  * Use avcodec_send_packet() to feed input to the decoder, then use
161  * avcodec_receive_frame() to receive decoded frames after each packet.
162  * Unlike with the old video decoding API, multiple frames might result from
163  * a packet. For audio, splitting the input packet into frames by partially
164  * decoding packets becomes transparent to the API user. You never need to
165  * feed an AVPacket to the API twice (unless it is rejected with AVERROR(EAGAIN) - then
166  * no data was read from the packet).
167  * Additionally, sending a flush/draining packet is required only once.
168  * - avcodec_encode_video2()/avcodec_encode_audio2():
169  * Use avcodec_send_frame() to feed input to the encoder, then use
170  * avcodec_receive_packet() to receive encoded packets.
171  * Providing user-allocated buffers for avcodec_receive_packet() is not
172  * possible.
173  * - The new API does not handle subtitles yet.
174  *
175  * Mixing new and old function calls on the same AVCodecContext is not allowed,
176  * and will result in undefined behavior.
177  *
178  * Some codecs might require using the new API; using the old API will return
179  * an error when calling it. All codecs support the new API.
180  *
181  * A codec is not allowed to return AVERROR(EAGAIN) for both sending and receiving. This
182  * would be an invalid state, which could put the codec user into an endless
183  * loop. The API has no concept of time either: it cannot happen that trying to
184  * do avcodec_send_packet() results in AVERROR(EAGAIN), but a repeated call 1 second
185  * later accepts the packet (with no other receive/flush API calls involved).
186  * The API is a strict state machine, and the passage of time is not supposed
187  * to influence it. Some timing-dependent behavior might still be deemed
188  * acceptable in certain cases. But it must never result in both send/receive
189  * returning EAGAIN at the same time at any point. It must also absolutely be
190  * avoided that the current state is "unstable" and can "flip-flop" between
191  * the send/receive APIs allowing progress. For example, it's not allowed that
192  * the codec randomly decides that it actually wants to consume a packet now
193  * instead of returning a frame, after it just returned AVERROR(EAGAIN) on an
194  * avcodec_send_packet() call.
195  * @}
196  */
197 
198 /**
199  * @defgroup lavc_core Core functions/structures.
200  * @ingroup libavc
201  *
202  * Basic definitions, functions for querying libavcodec capabilities,
203  * allocating core structures, etc.
204  * @{
205  */
206 
207 /**
208  * @ingroup lavc_decoding
209  * Required number of additionally allocated bytes at the end of the input bitstream for decoding.
210  * This is mainly needed because some optimized bitstream readers read
211  * 32 or 64 bit at once and could read over the end.<br>
212  * Note: If the first 23 bits of the additional bytes are not 0, then damaged
213  * MPEG bitstreams could cause overread and segfault.
214  */
215 #define AV_INPUT_BUFFER_PADDING_SIZE 64
216 
217 /**
218  * @ingroup lavc_encoding
219  * minimum encoding buffer size
220  * Used to avoid some checks during header writing.
221  */
222 #define AV_INPUT_BUFFER_MIN_SIZE 16384
223 
224 /**
225  * @ingroup lavc_decoding
226  */
228  /* We leave some space between them for extensions (drop some
229  * keyframes for intra-only or drop just some bidir frames). */
230  AVDISCARD_NONE =-16, ///< discard nothing
231  AVDISCARD_DEFAULT = 0, ///< discard useless packets like 0 size packets in avi
232  AVDISCARD_NONREF = 8, ///< discard all non reference
233  AVDISCARD_BIDIR = 16, ///< discard all bidirectional frames
234  AVDISCARD_NONINTRA= 24, ///< discard all non intra frames
235  AVDISCARD_NONKEY = 32, ///< discard all frames except keyframes
236  AVDISCARD_ALL = 48, ///< discard all
237 };
238 
249  AV_AUDIO_SERVICE_TYPE_NB , ///< Not part of ABI
250 };
251 
252 /**
253  * @ingroup lavc_encoding
254  */
255 typedef struct RcOverride{
258  int qscale; // If this is 0 then quality_factor will be used instead.
260 } RcOverride;
261 
262 /* encoding support
263  These flags can be passed in AVCodecContext.flags before initialization.
264  Note: Not everything is supported yet.
265 */
266 
267 /**
268  * Allow decoders to produce frames with data planes that are not aligned
269  * to CPU requirements (e.g. due to cropping).
270  */
271 #define AV_CODEC_FLAG_UNALIGNED (1 << 0)
272 /**
273  * Use fixed qscale.
274  */
275 #define AV_CODEC_FLAG_QSCALE (1 << 1)
276 /**
277  * 4 MV per MB allowed / advanced prediction for H.263.
278  */
279 #define AV_CODEC_FLAG_4MV (1 << 2)
280 /**
281  * Output even those frames that might be corrupted.
282  */
283 #define AV_CODEC_FLAG_OUTPUT_CORRUPT (1 << 3)
284 /**
285  * Use qpel MC.
286  */
287 #define AV_CODEC_FLAG_QPEL (1 << 4)
288 /**
289  * Don't output frames whose parameters differ from first
290  * decoded frame in stream.
291  */
292 #define AV_CODEC_FLAG_DROPCHANGED (1 << 5)
293 /**
294  * Use internal 2pass ratecontrol in first pass mode.
295  */
296 #define AV_CODEC_FLAG_PASS1 (1 << 9)
297 /**
298  * Use internal 2pass ratecontrol in second pass mode.
299  */
300 #define AV_CODEC_FLAG_PASS2 (1 << 10)
301 /**
302  * loop filter.
303  */
304 #define AV_CODEC_FLAG_LOOP_FILTER (1 << 11)
305 /**
306  * Only decode/encode grayscale.
307  */
308 #define AV_CODEC_FLAG_GRAY (1 << 13)
309 /**
310  * error[?] variables will be set during encoding.
311  */
312 #define AV_CODEC_FLAG_PSNR (1 << 15)
313 /**
314  * Input bitstream might be truncated at a random location
315  * instead of only at frame boundaries.
316  */
317 #define AV_CODEC_FLAG_TRUNCATED (1 << 16)
318 /**
319  * Use interlaced DCT.
320  */
321 #define AV_CODEC_FLAG_INTERLACED_DCT (1 << 18)
322 /**
323  * Force low delay.
324  */
325 #define AV_CODEC_FLAG_LOW_DELAY (1 << 19)
326 /**
327  * Place global headers in extradata instead of every keyframe.
328  */
329 #define AV_CODEC_FLAG_GLOBAL_HEADER (1 << 22)
330 /**
331  * Use only bitexact stuff (except (I)DCT).
332  */
333 #define AV_CODEC_FLAG_BITEXACT (1 << 23)
334 /* Fx : Flag for H.263+ extra options */
335 /**
336  * H.263 advanced intra coding / MPEG-4 AC prediction
337  */
338 #define AV_CODEC_FLAG_AC_PRED (1 << 24)
339 /**
340  * interlaced motion estimation
341  */
342 #define AV_CODEC_FLAG_INTERLACED_ME (1 << 29)
343 #define AV_CODEC_FLAG_CLOSED_GOP (1U << 31)
344 
345 /**
346  * Allow non spec compliant speedup tricks.
347  */
348 #define AV_CODEC_FLAG2_FAST (1 << 0)
349 /**
350  * Skip bitstream encoding.
351  */
352 #define AV_CODEC_FLAG2_NO_OUTPUT (1 << 2)
353 /**
354  * Place global headers at every keyframe instead of in extradata.
355  */
356 #define AV_CODEC_FLAG2_LOCAL_HEADER (1 << 3)
357 
358 /**
359  * timecode is in drop frame format. DEPRECATED!!!!
360  */
361 #define AV_CODEC_FLAG2_DROP_FRAME_TIMECODE (1 << 13)
362 
363 /**
364  * Input bitstream might be truncated at a packet boundaries
365  * instead of only at frame boundaries.
366  */
367 #define AV_CODEC_FLAG2_CHUNKS (1 << 15)
368 /**
369  * Discard cropping information from SPS.
370  */
371 #define AV_CODEC_FLAG2_IGNORE_CROP (1 << 16)
372 
373 /**
374  * Show all frames before the first keyframe
375  */
376 #define AV_CODEC_FLAG2_SHOW_ALL (1 << 22)
377 /**
378  * Export motion vectors through frame side data
379  */
380 #define AV_CODEC_FLAG2_EXPORT_MVS (1 << 28)
381 /**
382  * Do not skip samples and export skip information as frame side data
383  */
384 #define AV_CODEC_FLAG2_SKIP_MANUAL (1 << 29)
385 /**
386  * Do not reset ASS ReadOrder field on flush (subtitles decoding)
387  */
388 #define AV_CODEC_FLAG2_RO_FLUSH_NOOP (1 << 30)
389 
390 /* Unsupported options :
391  * Syntax Arithmetic coding (SAC)
392  * Reference Picture Selection
393  * Independent Segment Decoding */
394 /* /Fx */
395 /* codec capabilities */
396 
397 /* Exported side data.
398  These flags can be passed in AVCodecContext.export_side_data before initialization.
399 */
400 /**
401  * Export motion vectors through frame side data
402  */
403 #define AV_CODEC_EXPORT_DATA_MVS (1 << 0)
404 /**
405  * Export encoder Producer Reference Time through packet side data
406  */
407 #define AV_CODEC_EXPORT_DATA_PRFT (1 << 1)
408 /**
409  * Decoding only.
410  * Export the AVVideoEncParams structure through frame side data.
411  */
412 #define AV_CODEC_EXPORT_DATA_VIDEO_ENC_PARAMS (1 << 2)
413 
414 /**
415  * Pan Scan area.
416  * This specifies the area which should be displayed.
417  * Note there may be multiple such areas for one frame.
418  */
419 typedef struct AVPanScan {
420  /**
421  * id
422  * - encoding: Set by user.
423  * - decoding: Set by libavcodec.
424  */
425  int id;
426 
427  /**
428  * width and height in 1/16 pel
429  * - encoding: Set by user.
430  * - decoding: Set by libavcodec.
431  */
432  int width;
433  int height;
434 
435  /**
436  * position of the top left corner in 1/16 pel for up to 3 fields/frames
437  * - encoding: Set by user.
438  * - decoding: Set by libavcodec.
439  */
440  int16_t position[3][2];
441 } AVPanScan;
442 
443 /**
444  * This structure describes the bitrate properties of an encoded bitstream. It
445  * roughly corresponds to a subset the VBV parameters for MPEG-2 or HRD
446  * parameters for H.264/HEVC.
447  */
448 typedef struct AVCPBProperties {
449  /**
450  * Maximum bitrate of the stream, in bits per second.
451  * Zero if unknown or unspecified.
452  */
453 #if FF_API_UNSANITIZED_BITRATES
455 #else
456  int64_t max_bitrate;
457 #endif
458  /**
459  * Minimum bitrate of the stream, in bits per second.
460  * Zero if unknown or unspecified.
461  */
462 #if FF_API_UNSANITIZED_BITRATES
464 #else
465  int64_t min_bitrate;
466 #endif
467  /**
468  * Average bitrate of the stream, in bits per second.
469  * Zero if unknown or unspecified.
470  */
471 #if FF_API_UNSANITIZED_BITRATES
473 #else
474  int64_t avg_bitrate;
475 #endif
476 
477  /**
478  * The size of the buffer to which the ratecontrol is applied, in bits.
479  * Zero if unknown or unspecified.
480  */
482 
483  /**
484  * The delay between the time the packet this structure is associated with
485  * is received and the time when it should be decoded, in periods of a 27MHz
486  * clock.
487  *
488  * UINT64_MAX when unknown or unspecified.
489  */
490  uint64_t vbv_delay;
492 
493 /**
494  * This structure supplies correlation between a packet timestamp and a wall clock
495  * production time. The definition follows the Producer Reference Time ('prft')
496  * as defined in ISO/IEC 14496-12
497  */
498 typedef struct AVProducerReferenceTime {
499  /**
500  * A UTC timestamp, in microseconds, since Unix epoch (e.g, av_gettime()).
501  */
502  int64_t wallclock;
503  int flags;
505 
506 /**
507  * The decoder will keep a reference to the frame and may reuse it later.
508  */
509 #define AV_GET_BUFFER_FLAG_REF (1 << 0)
510 
511 struct AVCodecInternal;
512 
513 /**
514  * main external API structure.
515  * New fields can be added to the end with minor version bumps.
516  * Removal, reordering and changes to existing fields require a major
517  * version bump.
518  * You can use AVOptions (av_opt* / av_set/get*()) to access these fields from user
519  * applications.
520  * The name string for AVOptions options matches the associated command line
521  * parameter name and can be found in libavcodec/options_table.h
522  * The AVOption/command line parameter names differ in some cases from the C
523  * structure field names for historic reasons or brevity.
524  * sizeof(AVCodecContext) must not be used outside libav*.
525  */
526 typedef struct AVCodecContext {
527  /**
528  * information on struct for av_log
529  * - set by avcodec_alloc_context3
530  */
533 
534  enum AVMediaType codec_type; /* see AVMEDIA_TYPE_xxx */
535  const struct AVCodec *codec;
536  enum AVCodecID codec_id; /* see AV_CODEC_ID_xxx */
537 
538  /**
539  * fourcc (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A').
540  * This is used to work around some encoder bugs.
541  * A demuxer should set this to what is stored in the field used to identify the codec.
542  * If there are multiple such fields in a container then the demuxer should choose the one
543  * which maximizes the information about the used codec.
544  * If the codec tag field in a container is larger than 32 bits then the demuxer should
545  * remap the longer ID to 32 bits with a table or other structure. Alternatively a new
546  * extra_codec_tag + size could be added but for this a clear advantage must be demonstrated
547  * first.
548  * - encoding: Set by user, if not then the default based on codec_id will be used.
549  * - decoding: Set by user, will be converted to uppercase by libavcodec during init.
550  */
551  unsigned int codec_tag;
552 
553  void *priv_data;
554 
555  /**
556  * Private context used for internal data.
557  *
558  * Unlike priv_data, this is not codec-specific. It is used in general
559  * libavcodec functions.
560  */
561  struct AVCodecInternal *internal;
562 
563  /**
564  * Private data of the user, can be used to carry app specific stuff.
565  * - encoding: Set by user.
566  * - decoding: Set by user.
567  */
568  void *opaque;
569 
570  /**
571  * the average bitrate
572  * - encoding: Set by user; unused for constant quantizer encoding.
573  * - decoding: Set by user, may be overwritten by libavcodec
574  * if this info is available in the stream
575  */
576  int64_t bit_rate;
577 
578  /**
579  * number of bits the bitstream is allowed to diverge from the reference.
580  * the reference can be CBR (for CBR pass1) or VBR (for pass2)
581  * - encoding: Set by user; unused for constant quantizer encoding.
582  * - decoding: unused
583  */
585 
586  /**
587  * Global quality for codecs which cannot change it per frame.
588  * This should be proportional to MPEG-1/2/4 qscale.
589  * - encoding: Set by user.
590  * - decoding: unused
591  */
593 
594  /**
595  * - encoding: Set by user.
596  * - decoding: unused
597  */
599 #define FF_COMPRESSION_DEFAULT -1
600 
601  /**
602  * AV_CODEC_FLAG_*.
603  * - encoding: Set by user.
604  * - decoding: Set by user.
605  */
606  int flags;
607 
608  /**
609  * AV_CODEC_FLAG2_*
610  * - encoding: Set by user.
611  * - decoding: Set by user.
612  */
613  int flags2;
614 
615  /**
616  * some codecs need / can use extradata like Huffman tables.
617  * MJPEG: Huffman tables
618  * rv10: additional flags
619  * MPEG-4: global headers (they can be in the bitstream or here)
620  * The allocated memory should be AV_INPUT_BUFFER_PADDING_SIZE bytes larger
621  * than extradata_size to avoid problems if it is read with the bitstream reader.
622  * The bytewise contents of extradata must not depend on the architecture or CPU endianness.
623  * Must be allocated with the av_malloc() family of functions.
624  * - encoding: Set/allocated/freed by libavcodec.
625  * - decoding: Set/allocated/freed by user.
626  */
627  uint8_t *extradata;
629 
630  /**
631  * This is the fundamental unit of time (in seconds) in terms
632  * of which frame timestamps are represented. For fixed-fps content,
633  * timebase should be 1/framerate and timestamp increments should be
634  * identically 1.
635  * This often, but not always is the inverse of the frame rate or field rate
636  * for video. 1/time_base is not the average frame rate if the frame rate is not
637  * constant.
638  *
639  * Like containers, elementary streams also can store timestamps, 1/time_base
640  * is the unit in which these timestamps are specified.
641  * As example of such codec time base see ISO/IEC 14496-2:2001(E)
642  * vop_time_increment_resolution and fixed_vop_rate
643  * (fixed_vop_rate == 0 implies that it is different from the framerate)
644  *
645  * - encoding: MUST be set by user.
646  * - decoding: the use of this field for decoding is deprecated.
647  * Use framerate instead.
648  */
650 
651  /**
652  * For some codecs, the time base is closer to the field rate than the frame rate.
653  * Most notably, H.264 and MPEG-2 specify time_base as half of frame duration
654  * if no telecine is used ...
655  *
656  * Set to time_base ticks per frame. Default 1, e.g., H.264/MPEG-2 set it to 2.
657  */
659 
660  /**
661  * Codec delay.
662  *
663  * Encoding: Number of frames delay there will be from the encoder input to
664  * the decoder output. (we assume the decoder matches the spec)
665  * Decoding: Number of frames delay in addition to what a standard decoder
666  * as specified in the spec would produce.
667  *
668  * Video:
669  * Number of frames the decoded output will be delayed relative to the
670  * encoded input.
671  *
672  * Audio:
673  * For encoding, this field is unused (see initial_padding).
674  *
675  * For decoding, this is the number of samples the decoder needs to
676  * output before the decoder's output is valid. When seeking, you should
677  * start decoding this many samples prior to your desired seek point.
678  *
679  * - encoding: Set by libavcodec.
680  * - decoding: Set by libavcodec.
681  */
682  int delay;
683 
684 
685  /* video only */
686  /**
687  * picture width / height.
688  *
689  * @note Those fields may not match the values of the last
690  * AVFrame output by avcodec_decode_video2 due frame
691  * reordering.
692  *
693  * - encoding: MUST be set by user.
694  * - decoding: May be set by the user before opening the decoder if known e.g.
695  * from the container. Some decoders will require the dimensions
696  * to be set by the caller. During decoding, the decoder may
697  * overwrite those values as required while parsing the data.
698  */
699  int width, height;
700 
701  /**
702  * Bitstream width / height, may be different from width/height e.g. when
703  * the decoded frame is cropped before being output or lowres is enabled.
704  *
705  * @note Those field may not match the value of the last
706  * AVFrame output by avcodec_receive_frame() due frame
707  * reordering.
708  *
709  * - encoding: unused
710  * - decoding: May be set by the user before opening the decoder if known
711  * e.g. from the container. During decoding, the decoder may
712  * overwrite those values as required while parsing the data.
713  */
715 
716  /**
717  * the number of pictures in a group of pictures, or 0 for intra_only
718  * - encoding: Set by user.
719  * - decoding: unused
720  */
721  int gop_size;
722 
723  /**
724  * Pixel format, see AV_PIX_FMT_xxx.
725  * May be set by the demuxer if known from headers.
726  * May be overridden by the decoder if it knows better.
727  *
728  * @note This field may not match the value of the last
729  * AVFrame output by avcodec_receive_frame() due frame
730  * reordering.
731  *
732  * - encoding: Set by user.
733  * - decoding: Set by user if known, overridden by libavcodec while
734  * parsing the data.
735  */
736  enum AVPixelFormat pix_fmt;
737 
738  /**
739  * If non NULL, 'draw_horiz_band' is called by the libavcodec
740  * decoder to draw a horizontal band. It improves cache usage. Not
741  * all codecs can do that. You must check the codec capabilities
742  * beforehand.
743  * When multithreading is used, it may be called from multiple threads
744  * at the same time; threads might draw different parts of the same AVFrame,
745  * or multiple AVFrames, and there is no guarantee that slices will be drawn
746  * in order.
747  * The function is also used by hardware acceleration APIs.
748  * It is called at least once during frame decoding to pass
749  * the data needed for hardware render.
750  * In that mode instead of pixel data, AVFrame points to
751  * a structure specific to the acceleration API. The application
752  * reads the structure and can change some fields to indicate progress
753  * or mark state.
754  * - encoding: unused
755  * - decoding: Set by user.
756  * @param height the height of the slice
757  * @param y the y position of the slice
758  * @param type 1->top field, 2->bottom field, 3->frame
759  * @param offset offset into the AVFrame.data from which the slice should be read
760  */
761  void (*draw_horiz_band)(struct AVCodecContext *s,
762  const AVFrame *src, int offset[AV_NUM_DATA_POINTERS],
763  int y, int type, int height);
764 
765  /**
766  * callback to negotiate the pixelFormat
767  * @param fmt is the list of formats which are supported by the codec,
768  * it is terminated by -1 as 0 is a valid format, the formats are ordered by quality.
769  * The first is always the native one.
770  * @note The callback may be called again immediately if initialization for
771  * the selected (hardware-accelerated) pixel format failed.
772  * @warning Behavior is undefined if the callback returns a value not
773  * in the fmt list of formats.
774  * @return the chosen format
775  * - encoding: unused
776  * - decoding: Set by user, if not set the native format will be chosen.
777  */
778  enum AVPixelFormat (*get_format)(struct AVCodecContext *s, const enum AVPixelFormat * fmt);
779 
780  /**
781  * maximum number of B-frames between non-B-frames
782  * Note: The output will be delayed by max_b_frames+1 relative to the input.
783  * - encoding: Set by user.
784  * - decoding: unused
785  */
787 
788  /**
789  * qscale factor between IP and B-frames
790  * If > 0 then the last P-frame quantizer will be used (q= lastp_q*factor+offset).
791  * If < 0 then normal ratecontrol will be done (q= -normal_q*factor+offset).
792  * - encoding: Set by user.
793  * - decoding: unused
794  */
796 
797 #if FF_API_PRIVATE_OPT
798  /** @deprecated use encoder private options instead */
801 #endif
802 
803  /**
804  * qscale offset between IP and B-frames
805  * - encoding: Set by user.
806  * - decoding: unused
807  */
809 
810  /**
811  * Size of the frame reordering buffer in the decoder.
812  * For MPEG-2 it is 1 IPB or 0 low delay IP.
813  * - encoding: Set by libavcodec.
814  * - decoding: Set by libavcodec.
815  */
817 
818 #if FF_API_PRIVATE_OPT
819  /** @deprecated use encoder private options instead */
822 #endif
823 
824  /**
825  * qscale factor between P- and I-frames
826  * If > 0 then the last P-frame quantizer will be used (q = lastp_q * factor + offset).
827  * If < 0 then normal ratecontrol will be done (q= -normal_q*factor+offset).
828  * - encoding: Set by user.
829  * - decoding: unused
830  */
832 
833  /**
834  * qscale offset between P and I-frames
835  * - encoding: Set by user.
836  * - decoding: unused
837  */
839 
840  /**
841  * luminance masking (0-> disabled)
842  * - encoding: Set by user.
843  * - decoding: unused
844  */
846 
847  /**
848  * temporary complexity masking (0-> disabled)
849  * - encoding: Set by user.
850  * - decoding: unused
851  */
853 
854  /**
855  * spatial complexity masking (0-> disabled)
856  * - encoding: Set by user.
857  * - decoding: unused
858  */
860 
861  /**
862  * p block masking (0-> disabled)
863  * - encoding: Set by user.
864  * - decoding: unused
865  */
866  float p_masking;
867 
868  /**
869  * darkness masking (0-> disabled)
870  * - encoding: Set by user.
871  * - decoding: unused
872  */
874 
875  /**
876  * slice count
877  * - encoding: Set by libavcodec.
878  * - decoding: Set by user (or 0).
879  */
881 
882 #if FF_API_PRIVATE_OPT
883  /** @deprecated use encoder private options instead */
886 #define FF_PRED_LEFT 0
887 #define FF_PRED_PLANE 1
888 #define FF_PRED_MEDIAN 2
889 #endif
890 
891  /**
892  * slice offsets in the frame in bytes
893  * - encoding: Set/allocated by libavcodec.
894  * - decoding: Set/allocated by user (or NULL).
895  */
897 
898  /**
899  * sample aspect ratio (0 if unknown)
900  * That is the width of a pixel divided by the height of the pixel.
901  * Numerator and denominator must be relatively prime and smaller than 256 for some video standards.
902  * - encoding: Set by user.
903  * - decoding: Set by libavcodec.
904  */
906 
907  /**
908  * motion estimation comparison function
909  * - encoding: Set by user.
910  * - decoding: unused
911  */
912  int me_cmp;
913  /**
914  * subpixel motion estimation comparison function
915  * - encoding: Set by user.
916  * - decoding: unused
917  */
919  /**
920  * macroblock comparison function (not supported yet)
921  * - encoding: Set by user.
922  * - decoding: unused
923  */
924  int mb_cmp;
925  /**
926  * interlaced DCT comparison function
927  * - encoding: Set by user.
928  * - decoding: unused
929  */
931 #define FF_CMP_SAD 0
932 #define FF_CMP_SSE 1
933 #define FF_CMP_SATD 2
934 #define FF_CMP_DCT 3
935 #define FF_CMP_PSNR 4
936 #define FF_CMP_BIT 5
937 #define FF_CMP_RD 6
938 #define FF_CMP_ZERO 7
939 #define FF_CMP_VSAD 8
940 #define FF_CMP_VSSE 9
941 #define FF_CMP_NSSE 10
942 #define FF_CMP_W53 11
943 #define FF_CMP_W97 12
944 #define FF_CMP_DCTMAX 13
945 #define FF_CMP_DCT264 14
946 #define FF_CMP_MEDIAN_SAD 15
947 #define FF_CMP_CHROMA 256
948 
949  /**
950  * ME diamond size & shape
951  * - encoding: Set by user.
952  * - decoding: unused
953  */
954  int dia_size;
955 
956  /**
957  * amount of previous MV predictors (2a+1 x 2a+1 square)
958  * - encoding: Set by user.
959  * - decoding: unused
960  */
962 
963 #if FF_API_PRIVATE_OPT
964  /** @deprecated use encoder private options instead */
966  int pre_me;
967 #endif
968 
969  /**
970  * motion estimation prepass comparison function
971  * - encoding: Set by user.
972  * - decoding: unused
973  */
975 
976  /**
977  * ME prepass diamond size & shape
978  * - encoding: Set by user.
979  * - decoding: unused
980  */
982 
983  /**
984  * subpel ME quality
985  * - encoding: Set by user.
986  * - decoding: unused
987  */
989 
990  /**
991  * maximum motion estimation search range in subpel units
992  * If 0 then no limit.
993  *
994  * - encoding: Set by user.
995  * - decoding: unused
996  */
997  int me_range;
998 
999  /**
1000  * slice flags
1001  * - encoding: unused
1002  * - decoding: Set by user.
1003  */
1005 #define SLICE_FLAG_CODED_ORDER 0x0001 ///< draw_horiz_band() is called in coded order instead of display
1006 #define SLICE_FLAG_ALLOW_FIELD 0x0002 ///< allow draw_horiz_band() with field slices (MPEG-2 field pics)
1007 #define SLICE_FLAG_ALLOW_PLANE 0x0004 ///< allow draw_horiz_band() with 1 component at a time (SVQ1)
1008 
1009  /**
1010  * macroblock decision mode
1011  * - encoding: Set by user.
1012  * - decoding: unused
1013  */
1015 #define FF_MB_DECISION_SIMPLE 0 ///< uses mb_cmp
1016 #define FF_MB_DECISION_BITS 1 ///< chooses the one which needs the fewest bits
1017 #define FF_MB_DECISION_RD 2 ///< rate distortion
1018 
1019  /**
1020  * custom intra quantization matrix
1021  * Must be allocated with the av_malloc() family of functions, and will be freed in
1022  * avcodec_free_context().
1023  * - encoding: Set/allocated by user, freed by libavcodec. Can be NULL.
1024  * - decoding: Set/allocated/freed by libavcodec.
1025  */
1026  uint16_t *intra_matrix;
1027 
1028  /**
1029  * custom inter quantization matrix
1030  * Must be allocated with the av_malloc() family of functions, and will be freed in
1031  * avcodec_free_context().
1032  * - encoding: Set/allocated by user, freed by libavcodec. Can be NULL.
1033  * - decoding: Set/allocated/freed by libavcodec.
1034  */
1035  uint16_t *inter_matrix;
1036 
1037 #if FF_API_PRIVATE_OPT
1038  /** @deprecated use encoder private options instead */
1041 
1042  /** @deprecated use encoder private options instead */
1045 #endif
1046 
1047  /**
1048  * precision of the intra DC coefficient - 8
1049  * - encoding: Set by user.
1050  * - decoding: Set by libavcodec
1051  */
1053 
1054  /**
1055  * Number of macroblock rows at the top which are skipped.
1056  * - encoding: unused
1057  * - decoding: Set by user.
1058  */
1060 
1061  /**
1062  * Number of macroblock rows at the bottom which are skipped.
1063  * - encoding: unused
1064  * - decoding: Set by user.
1065  */
1067 
1068  /**
1069  * minimum MB Lagrange multiplier
1070  * - encoding: Set by user.
1071  * - decoding: unused
1072  */
1073  int mb_lmin;
1074 
1075  /**
1076  * maximum MB Lagrange multiplier
1077  * - encoding: Set by user.
1078  * - decoding: unused
1079  */
1080  int mb_lmax;
1081 
1082 #if FF_API_PRIVATE_OPT
1083  /**
1084  * @deprecated use encoder private options instead
1085  */
1088 #endif
1089 
1090  /**
1091  * - encoding: Set by user.
1092  * - decoding: unused
1093  */
1095 
1096 #if FF_API_PRIVATE_OPT
1097  /** @deprecated use encoder private options instead */
1100 #endif
1101 
1102  /**
1103  * minimum GOP size
1104  * - encoding: Set by user.
1105  * - decoding: unused
1106  */
1108 
1109  /**
1110  * number of reference frames
1111  * - encoding: Set by user.
1112  * - decoding: Set by lavc.
1113  */
1114  int refs;
1115 
1116 #if FF_API_PRIVATE_OPT
1117  /** @deprecated use encoder private options instead */
1120 #endif
1121 
1122  /**
1123  * Note: Value depends upon the compare function used for fullpel ME.
1124  * - encoding: Set by user.
1125  * - decoding: unused
1126  */
1128 
1129 #if FF_API_PRIVATE_OPT
1130  /** @deprecated use encoder private options instead */
1133 #endif
1134 
1135  /**
1136  * Chromaticity coordinates of the source primaries.
1137  * - encoding: Set by user
1138  * - decoding: Set by libavcodec
1139  */
1141 
1142  /**
1143  * Color Transfer Characteristic.
1144  * - encoding: Set by user
1145  * - decoding: Set by libavcodec
1146  */
1148 
1149  /**
1150  * YUV colorspace type.
1151  * - encoding: Set by user
1152  * - decoding: Set by libavcodec
1153  */
1154  enum AVColorSpace colorspace;
1155 
1156  /**
1157  * MPEG vs JPEG YUV range.
1158  * - encoding: Set by user
1159  * - decoding: Set by libavcodec
1160  */
1162 
1163  /**
1164  * This defines the location of chroma samples.
1165  * - encoding: Set by user
1166  * - decoding: Set by libavcodec
1167  */
1169 
1170  /**
1171  * Number of slices.
1172  * Indicates number of picture subdivisions. Used for parallelized
1173  * decoding.
1174  * - encoding: Set by user
1175  * - decoding: unused
1176  */
1177  int slices;
1178 
1179  /** Field order
1180  * - encoding: set by libavcodec
1181  * - decoding: Set by user.
1182  */
1184 
1185  /* audio only */
1186  int sample_rate; ///< samples per second
1187  int channels; ///< number of audio channels
1188 
1189  /**
1190  * audio sample format
1191  * - encoding: Set by user.
1192  * - decoding: Set by libavcodec.
1193  */
1194  enum AVSampleFormat sample_fmt; ///< sample format
1195 
1196  /* The following data should not be initialized. */
1197  /**
1198  * Number of samples per channel in an audio frame.
1199  *
1200  * - encoding: set by libavcodec in avcodec_open2(). Each submitted frame
1201  * except the last must contain exactly frame_size samples per channel.
1202  * May be 0 when the codec has AV_CODEC_CAP_VARIABLE_FRAME_SIZE set, then the
1203  * frame size is not restricted.
1204  * - decoding: may be set by some decoders to indicate constant frame size
1205  */
1207 
1208  /**
1209  * Frame counter, set by libavcodec.
1210  *
1211  * - decoding: total number of frames returned from the decoder so far.
1212  * - encoding: total number of frames passed to the encoder so far.
1213  *
1214  * @note the counter is not incremented if encoding/decoding resulted in
1215  * an error.
1216  */
1218 
1219  /**
1220  * number of bytes per packet if constant and known or 0
1221  * Used by some WAV based audio codecs.
1222  */
1224 
1225  /**
1226  * Audio cutoff bandwidth (0 means "automatic")
1227  * - encoding: Set by user.
1228  * - decoding: unused
1229  */
1230  int cutoff;
1231 
1232  /**
1233  * Audio channel layout.
1234  * - encoding: set by user.
1235  * - decoding: set by user, may be overwritten by libavcodec.
1236  */
1237  uint64_t channel_layout;
1238 
1239  /**
1240  * Request decoder to use this channel layout if it can (0 for default)
1241  * - encoding: unused
1242  * - decoding: Set by user.
1243  */
1245 
1246  /**
1247  * Type of service that the audio stream conveys.
1248  * - encoding: Set by user.
1249  * - decoding: Set by libavcodec.
1250  */
1252 
1253  /**
1254  * desired sample format
1255  * - encoding: Not used.
1256  * - decoding: Set by user.
1257  * Decoder will decode to this format if it can.
1258  */
1260 
1261  /**
1262  * This callback is called at the beginning of each frame to get data
1263  * buffer(s) for it. There may be one contiguous buffer for all the data or
1264  * there may be a buffer per each data plane or anything in between. What
1265  * this means is, you may set however many entries in buf[] you feel necessary.
1266  * Each buffer must be reference-counted using the AVBuffer API (see description
1267  * of buf[] below).
1268  *
1269  * The following fields will be set in the frame before this callback is
1270  * called:
1271  * - format
1272  * - width, height (video only)
1273  * - sample_rate, channel_layout, nb_samples (audio only)
1274  * Their values may differ from the corresponding values in
1275  * AVCodecContext. This callback must use the frame values, not the codec
1276  * context values, to calculate the required buffer size.
1277  *
1278  * This callback must fill the following fields in the frame:
1279  * - data[]
1280  * - linesize[]
1281  * - extended_data:
1282  * * if the data is planar audio with more than 8 channels, then this
1283  * callback must allocate and fill extended_data to contain all pointers
1284  * to all data planes. data[] must hold as many pointers as it can.
1285  * extended_data must be allocated with av_malloc() and will be freed in
1286  * av_frame_unref().
1287  * * otherwise extended_data must point to data
1288  * - buf[] must contain one or more pointers to AVBufferRef structures. Each of
1289  * the frame's data and extended_data pointers must be contained in these. That
1290  * is, one AVBufferRef for each allocated chunk of memory, not necessarily one
1291  * AVBufferRef per data[] entry. See: av_buffer_create(), av_buffer_alloc(),
1292  * and av_buffer_ref().
1293  * - extended_buf and nb_extended_buf must be allocated with av_malloc() by
1294  * this callback and filled with the extra buffers if there are more
1295  * buffers than buf[] can hold. extended_buf will be freed in
1296  * av_frame_unref().
1297  *
1298  * If AV_CODEC_CAP_DR1 is not set then get_buffer2() must call
1299  * avcodec_default_get_buffer2() instead of providing buffers allocated by
1300  * some other means.
1301  *
1302  * Each data plane must be aligned to the maximum required by the target
1303  * CPU.
1304  *
1305  * @see avcodec_default_get_buffer2()
1306  *
1307  * Video:
1308  *
1309  * If AV_GET_BUFFER_FLAG_REF is set in flags then the frame may be reused
1310  * (read and/or written to if it is writable) later by libavcodec.
1311  *
1312  * avcodec_align_dimensions2() should be used to find the required width and
1313  * height, as they normally need to be rounded up to the next multiple of 16.
1314  *
1315  * Some decoders do not support linesizes changing between frames.
1316  *
1317  * If frame multithreading is used and thread_safe_callbacks is set,
1318  * this callback may be called from a different thread, but not from more
1319  * than one at once. Does not need to be reentrant.
1320  *
1321  * @see avcodec_align_dimensions2()
1322  *
1323  * Audio:
1324  *
1325  * Decoders request a buffer of a particular size by setting
1326  * AVFrame.nb_samples prior to calling get_buffer2(). The decoder may,
1327  * however, utilize only part of the buffer by setting AVFrame.nb_samples
1328  * to a smaller value in the output frame.
1329  *
1330  * As a convenience, av_samples_get_buffer_size() and
1331  * av_samples_fill_arrays() in libavutil may be used by custom get_buffer2()
1332  * functions to find the required data size and to fill data pointers and
1333  * linesize. In AVFrame.linesize, only linesize[0] may be set for audio
1334  * since all planes must be the same size.
1335  *
1336  * @see av_samples_get_buffer_size(), av_samples_fill_arrays()
1337  *
1338  * - encoding: unused
1339  * - decoding: Set by libavcodec, user can override.
1340  */
1341  int (*get_buffer2)(struct AVCodecContext *s, AVFrame *frame, int flags);
1342 
1343  /**
1344  * If non-zero, the decoded audio and video frames returned from
1345  * avcodec_decode_video2() and avcodec_decode_audio4() are reference-counted
1346  * and are valid indefinitely. The caller must free them with
1347  * av_frame_unref() when they are not needed anymore.
1348  * Otherwise, the decoded frames must not be freed by the caller and are
1349  * only valid until the next decode call.
1350  *
1351  * This is always automatically enabled if avcodec_receive_frame() is used.
1352  *
1353  * - encoding: unused
1354  * - decoding: set by the caller before avcodec_open2().
1355  */
1358 
1359  /* - encoding parameters */
1360  float qcompress; ///< amount of qscale change between easy & hard scenes (0.0-1.0)
1361  float qblur; ///< amount of qscale smoothing over time (0.0-1.0)
1362 
1363  /**
1364  * minimum quantizer
1365  * - encoding: Set by user.
1366  * - decoding: unused
1367  */
1368  int qmin;
1369 
1370  /**
1371  * maximum quantizer
1372  * - encoding: Set by user.
1373  * - decoding: unused
1374  */
1375  int qmax;
1376 
1377  /**
1378  * maximum quantizer difference between frames
1379  * - encoding: Set by user.
1380  * - decoding: unused
1381  */
1383 
1384  /**
1385  * decoder bitstream buffer size
1386  * - encoding: Set by user.
1387  * - decoding: unused
1388  */
1390 
1391  /**
1392  * ratecontrol override, see RcOverride
1393  * - encoding: Allocated/set/freed by user.
1394  * - decoding: unused
1395  */
1398 
1399  /**
1400  * maximum bitrate
1401  * - encoding: Set by user.
1402  * - decoding: Set by user, may be overwritten by libavcodec.
1403  */
1404  int64_t rc_max_rate;
1405 
1406  /**
1407  * minimum bitrate
1408  * - encoding: Set by user.
1409  * - decoding: unused
1410  */
1411  int64_t rc_min_rate;
1412 
1413  /**
1414  * Ratecontrol attempt to use, at maximum, <value> of what can be used without an underflow.
1415  * - encoding: Set by user.
1416  * - decoding: unused.
1417  */
1419 
1420  /**
1421  * Ratecontrol attempt to use, at least, <value> times the amount needed to prevent a vbv overflow.
1422  * - encoding: Set by user.
1423  * - decoding: unused.
1424  */
1426 
1427  /**
1428  * Number of bits which should be loaded into the rc buffer before decoding starts.
1429  * - encoding: Set by user.
1430  * - decoding: unused
1431  */
1433 
1434 #if FF_API_CODER_TYPE
1435 #define FF_CODER_TYPE_VLC 0
1436 #define FF_CODER_TYPE_AC 1
1437 #define FF_CODER_TYPE_RAW 2
1438 #define FF_CODER_TYPE_RLE 3
1439  /**
1440  * @deprecated use encoder private options instead
1441  */
1444 #endif /* FF_API_CODER_TYPE */
1445 
1446 #if FF_API_PRIVATE_OPT
1447  /** @deprecated use encoder private options instead */
1450 #endif
1451 
1452 #if FF_API_PRIVATE_OPT
1453  /** @deprecated use encoder private options instead */
1456 
1457  /** @deprecated use encoder private options instead */
1460 
1461  /** @deprecated use encoder private options instead */
1464 
1465  /** @deprecated use encoder private options instead */
1468 #endif /* FF_API_PRIVATE_OPT */
1469 
1470  /**
1471  * trellis RD quantization
1472  * - encoding: Set by user.
1473  * - decoding: unused
1474  */
1475  int trellis;
1476 
1477 #if FF_API_PRIVATE_OPT
1478  /** @deprecated use encoder private options instead */
1481 
1482  /** @deprecated use encoder private options instead */
1485 
1486  /** @deprecated use encoder private options instead */
1489 #endif
1490 
1491 #if FF_API_RTP_CALLBACK
1492  /**
1493  * @deprecated unused
1494  */
1495  /* The RTP callback: This function is called */
1496  /* every time the encoder has a packet to send. */
1497  /* It depends on the encoder if the data starts */
1498  /* with a Start Code (it should). H.263 does. */
1499  /* mb_nb contains the number of macroblocks */
1500  /* encoded in the RTP payload. */
1502  void (*rtp_callback)(struct AVCodecContext *avctx, void *data, int size, int mb_nb);
1503 #endif
1504 
1505 #if FF_API_PRIVATE_OPT
1506  /** @deprecated use encoder private options instead */
1508  int rtp_payload_size; /* The size of the RTP payload: the coder will */
1509  /* do its best to deliver a chunk with size */
1510  /* below rtp_payload_size, the chunk will start */
1511  /* with a start code on some codecs like H.263. */
1512  /* This doesn't take account of any particular */
1513  /* headers inside the transmitted RTP payload. */
1514 #endif
1515 
1516 #if FF_API_STAT_BITS
1517  /* statistics, used for 2-pass encoding */
1519  int mv_bits;
1527  int i_count;
1529  int p_count;
1534 
1535  /** @deprecated this field is unused */
1538 #endif
1539 
1540  /**
1541  * pass1 encoding statistics output buffer
1542  * - encoding: Set by libavcodec.
1543  * - decoding: unused
1544  */
1545  char *stats_out;
1546 
1547  /**
1548  * pass2 encoding statistics input buffer
1549  * Concatenated stuff from stats_out of pass1 should be placed here.
1550  * - encoding: Allocated/set/freed by user.
1551  * - decoding: unused
1552  */
1553  char *stats_in;
1554 
1555  /**
1556  * Work around bugs in encoders which sometimes cannot be detected automatically.
1557  * - encoding: Set by user
1558  * - decoding: Set by user
1559  */
1561 #define FF_BUG_AUTODETECT 1 ///< autodetection
1562 #define FF_BUG_XVID_ILACE 4
1563 #define FF_BUG_UMP4 8
1564 #define FF_BUG_NO_PADDING 16
1565 #define FF_BUG_AMV 32
1566 #define FF_BUG_QPEL_CHROMA 64
1567 #define FF_BUG_STD_QPEL 128
1568 #define FF_BUG_QPEL_CHROMA2 256
1569 #define FF_BUG_DIRECT_BLOCKSIZE 512
1570 #define FF_BUG_EDGE 1024
1571 #define FF_BUG_HPEL_CHROMA 2048
1572 #define FF_BUG_DC_CLIP 4096
1573 #define FF_BUG_MS 8192 ///< Work around various bugs in Microsoft's broken decoders.
1574 #define FF_BUG_TRUNCATED 16384
1575 #define FF_BUG_IEDGE 32768
1576 
1577  /**
1578  * strictly follow the standard (MPEG-4, ...).
1579  * - encoding: Set by user.
1580  * - decoding: Set by user.
1581  * Setting this to STRICT or higher means the encoder and decoder will
1582  * generally do stupid things, whereas setting it to unofficial or lower
1583  * will mean the encoder might produce output that is not supported by all
1584  * spec-compliant decoders. Decoders don't differentiate between normal,
1585  * unofficial and experimental (that is, they always try to decode things
1586  * when they can) unless they are explicitly asked to behave stupidly
1587  * (=strictly conform to the specs)
1588  */
1590 #define FF_COMPLIANCE_VERY_STRICT 2 ///< Strictly conform to an older more strict version of the spec or reference software.
1591 #define FF_COMPLIANCE_STRICT 1 ///< Strictly conform to all the things in the spec no matter what consequences.
1592 #define FF_COMPLIANCE_NORMAL 0
1593 #define FF_COMPLIANCE_UNOFFICIAL -1 ///< Allow unofficial extensions
1594 #define FF_COMPLIANCE_EXPERIMENTAL -2 ///< Allow nonstandardized experimental things.
1595 
1596  /**
1597  * error concealment flags
1598  * - encoding: unused
1599  * - decoding: Set by user.
1600  */
1602 #define FF_EC_GUESS_MVS 1
1603 #define FF_EC_DEBLOCK 2
1604 #define FF_EC_FAVOR_INTER 256
1605 
1606  /**
1607  * debug
1608  * - encoding: Set by user.
1609  * - decoding: Set by user.
1610  */
1611  int debug;
1612 #define FF_DEBUG_PICT_INFO 1
1613 #define FF_DEBUG_RC 2
1614 #define FF_DEBUG_BITSTREAM 4
1615 #define FF_DEBUG_MB_TYPE 8
1616 #define FF_DEBUG_QP 16
1617 #if FF_API_DEBUG_MV
1618 /**
1619  * @deprecated this option does nothing
1620  */
1621 #define FF_DEBUG_MV 32
1622 #endif
1623 #define FF_DEBUG_DCT_COEFF 0x00000040
1624 #define FF_DEBUG_SKIP 0x00000080
1625 #define FF_DEBUG_STARTCODE 0x00000100
1626 #define FF_DEBUG_ER 0x00000400
1627 #define FF_DEBUG_MMCO 0x00000800
1628 #define FF_DEBUG_BUGS 0x00001000
1629 #if FF_API_DEBUG_MV
1630 #define FF_DEBUG_VIS_QP 0x00002000
1631 #define FF_DEBUG_VIS_MB_TYPE 0x00004000
1632 #endif
1633 #define FF_DEBUG_BUFFERS 0x00008000
1634 #define FF_DEBUG_THREADS 0x00010000
1635 #define FF_DEBUG_GREEN_MD 0x00800000
1636 #define FF_DEBUG_NOMC 0x01000000
1637 
1638 #if FF_API_DEBUG_MV
1639  /**
1640  * debug
1641  * - encoding: Set by user.
1642  * - decoding: Set by user.
1643  */
1644  int debug_mv;
1645 #define FF_DEBUG_VIS_MV_P_FOR 0x00000001 // visualize forward predicted MVs of P-frames
1646 #define FF_DEBUG_VIS_MV_B_FOR 0x00000002 // visualize forward predicted MVs of B-frames
1647 #define FF_DEBUG_VIS_MV_B_BACK 0x00000004 // visualize backward predicted MVs of B-frames
1648 #endif
1649 
1650  /**
1651  * Error recognition; may misdetect some more or less valid parts as errors.
1652  * - encoding: unused
1653  * - decoding: Set by user.
1654  */
1656 
1657 /**
1658  * Verify checksums embedded in the bitstream (could be of either encoded or
1659  * decoded data, depending on the codec) and print an error message on mismatch.
1660  * If AV_EF_EXPLODE is also set, a mismatching checksum will result in the
1661  * decoder returning an error.
1662  */
1663 #define AV_EF_CRCCHECK (1<<0)
1664 #define AV_EF_BITSTREAM (1<<1) ///< detect bitstream specification deviations
1665 #define AV_EF_BUFFER (1<<2) ///< detect improper bitstream length
1666 #define AV_EF_EXPLODE (1<<3) ///< abort decoding on minor error detection
1667 
1668 #define AV_EF_IGNORE_ERR (1<<15) ///< ignore errors and continue
1669 #define AV_EF_CAREFUL (1<<16) ///< consider things that violate the spec, are fast to calculate and have not been seen in the wild as errors
1670 #define AV_EF_COMPLIANT (1<<17) ///< consider all spec non compliances as errors
1671 #define AV_EF_AGGRESSIVE (1<<18) ///< consider things that a sane encoder should not do as an error
1672 
1673 
1674  /**
1675  * opaque 64-bit number (generally a PTS) that will be reordered and
1676  * output in AVFrame.reordered_opaque
1677  * - encoding: Set by libavcodec to the reordered_opaque of the input
1678  * frame corresponding to the last returned packet. Only
1679  * supported by encoders with the
1680  * AV_CODEC_CAP_ENCODER_REORDERED_OPAQUE capability.
1681  * - decoding: Set by user.
1682  */
1684 
1685  /**
1686  * Hardware accelerator in use
1687  * - encoding: unused.
1688  * - decoding: Set by libavcodec
1689  */
1690  const struct AVHWAccel *hwaccel;
1691 
1692  /**
1693  * Hardware accelerator context.
1694  * For some hardware accelerators, a global context needs to be
1695  * provided by the user. In that case, this holds display-dependent
1696  * data FFmpeg cannot instantiate itself. Please refer to the
1697  * FFmpeg HW accelerator documentation to know how to fill this
1698  * is. e.g. for VA API, this is a struct vaapi_context.
1699  * - encoding: unused
1700  * - decoding: Set by user
1701  */
1703 
1704  /**
1705  * error
1706  * - encoding: Set by libavcodec if flags & AV_CODEC_FLAG_PSNR.
1707  * - decoding: unused
1708  */
1710 
1711  /**
1712  * DCT algorithm, see FF_DCT_* below
1713  * - encoding: Set by user.
1714  * - decoding: unused
1715  */
1717 #define FF_DCT_AUTO 0
1718 #define FF_DCT_FASTINT 1
1719 #define FF_DCT_INT 2
1720 #define FF_DCT_MMX 3
1721 #define FF_DCT_ALTIVEC 5
1722 #define FF_DCT_FAAN 6
1723 
1724  /**
1725  * IDCT algorithm, see FF_IDCT_* below.
1726  * - encoding: Set by user.
1727  * - decoding: Set by user.
1728  */
1730 #define FF_IDCT_AUTO 0
1731 #define FF_IDCT_INT 1
1732 #define FF_IDCT_SIMPLE 2
1733 #define FF_IDCT_SIMPLEMMX 3
1734 #define FF_IDCT_ARM 7
1735 #define FF_IDCT_ALTIVEC 8
1736 #define FF_IDCT_SIMPLEARM 10
1737 #define FF_IDCT_XVID 14
1738 #define FF_IDCT_SIMPLEARMV5TE 16
1739 #define FF_IDCT_SIMPLEARMV6 17
1740 #define FF_IDCT_FAAN 20
1741 #define FF_IDCT_SIMPLENEON 22
1742 #define FF_IDCT_NONE 24 /* Used by XvMC to extract IDCT coefficients with FF_IDCT_PERM_NONE */
1743 #define FF_IDCT_SIMPLEAUTO 128
1744 
1745  /**
1746  * bits per sample/pixel from the demuxer (needed for huffyuv).
1747  * - encoding: Set by libavcodec.
1748  * - decoding: Set by user.
1749  */
1751 
1752  /**
1753  * Bits per sample/pixel of internal libavcodec pixel/sample format.
1754  * - encoding: set by user.
1755  * - decoding: set by libavcodec.
1756  */
1758 
1759 #if FF_API_LOWRES
1760  /**
1761  * low resolution decoding, 1-> 1/2 size, 2->1/4 size
1762  * - encoding: unused
1763  * - decoding: Set by user.
1764  */
1765  int lowres;
1766 #endif
1767 
1768 #if FF_API_CODED_FRAME
1769  /**
1770  * the picture in the bitstream
1771  * - encoding: Set by libavcodec.
1772  * - decoding: unused
1773  *
1774  * @deprecated use the quality factor packet side data instead
1775  */
1777 #endif
1778 
1779  /**
1780  * thread count
1781  * is used to decide how many independent tasks should be passed to execute()
1782  * - encoding: Set by user.
1783  * - decoding: Set by user.
1784  */
1786 
1787  /**
1788  * Which multithreading methods to use.
1789  * Use of FF_THREAD_FRAME will increase decoding delay by one frame per thread,
1790  * so clients which cannot provide future frames should not use it.
1791  *
1792  * - encoding: Set by user, otherwise the default is used.
1793  * - decoding: Set by user, otherwise the default is used.
1794  */
1796 #define FF_THREAD_FRAME 1 ///< Decode more than one frame at once
1797 #define FF_THREAD_SLICE 2 ///< Decode more than one part of a single frame at once
1798 
1799  /**
1800  * Which multithreading methods are in use by the codec.
1801  * - encoding: Set by libavcodec.
1802  * - decoding: Set by libavcodec.
1803  */
1805 
1806  /**
1807  * Set by the client if its custom get_buffer() callback can be called
1808  * synchronously from another thread, which allows faster multithreaded decoding.
1809  * draw_horiz_band() will be called from other threads regardless of this setting.
1810  * Ignored if the default get_buffer() is used.
1811  * - encoding: Set by user.
1812  * - decoding: Set by user.
1813  */
1815 
1816  /**
1817  * The codec may call this to execute several independent things.
1818  * It will return only after finishing all tasks.
1819  * The user may replace this with some multithreaded implementation,
1820  * the default implementation will execute the parts serially.
1821  * @param count the number of things to execute
1822  * - encoding: Set by libavcodec, user can override.
1823  * - decoding: Set by libavcodec, user can override.
1824  */
1825  int (*execute)(struct AVCodecContext *c, int (*func)(struct AVCodecContext *c2, void *arg), void *arg2, int *ret, int count, int size);
1826 
1827  /**
1828  * The codec may call this to execute several independent things.
1829  * It will return only after finishing all tasks.
1830  * The user may replace this with some multithreaded implementation,
1831  * the default implementation will execute the parts serially.
1832  * Also see avcodec_thread_init and e.g. the --enable-pthread configure option.
1833  * @param c context passed also to func
1834  * @param count the number of things to execute
1835  * @param arg2 argument passed unchanged to func
1836  * @param ret return values of executed functions, must have space for "count" values. May be NULL.
1837  * @param func function that will be called count times, with jobnr from 0 to count-1.
1838  * threadnr will be in the range 0 to c->thread_count-1 < MAX_THREADS and so that no
1839  * two instances of func executing at the same time will have the same threadnr.
1840  * @return always 0 currently, but code should handle a future improvement where when any call to func
1841  * returns < 0 no further calls to func may be done and < 0 is returned.
1842  * - encoding: Set by libavcodec, user can override.
1843  * - decoding: Set by libavcodec, user can override.
1844  */
1845  int (*execute2)(struct AVCodecContext *c, int (*func)(struct AVCodecContext *c2, void *arg, int jobnr, int threadnr), void *arg2, int *ret, int count);
1846 
1847  /**
1848  * noise vs. sse weight for the nsse comparison function
1849  * - encoding: Set by user.
1850  * - decoding: unused
1851  */
1853 
1854  /**
1855  * profile
1856  * - encoding: Set by user.
1857  * - decoding: Set by libavcodec.
1858  */
1859  int profile;
1860 #define FF_PROFILE_UNKNOWN -99
1861 #define FF_PROFILE_RESERVED -100
1862 
1863 #define FF_PROFILE_AAC_MAIN 0
1864 #define FF_PROFILE_AAC_LOW 1
1865 #define FF_PROFILE_AAC_SSR 2
1866 #define FF_PROFILE_AAC_LTP 3
1867 #define FF_PROFILE_AAC_HE 4
1868 #define FF_PROFILE_AAC_HE_V2 28
1869 #define FF_PROFILE_AAC_LD 22
1870 #define FF_PROFILE_AAC_ELD 38
1871 #define FF_PROFILE_MPEG2_AAC_LOW 128
1872 #define FF_PROFILE_MPEG2_AAC_HE 131
1873 
1874 #define FF_PROFILE_DNXHD 0
1875 #define FF_PROFILE_DNXHR_LB 1
1876 #define FF_PROFILE_DNXHR_SQ 2
1877 #define FF_PROFILE_DNXHR_HQ 3
1878 #define FF_PROFILE_DNXHR_HQX 4
1879 #define FF_PROFILE_DNXHR_444 5
1880 
1881 #define FF_PROFILE_DTS 20
1882 #define FF_PROFILE_DTS_ES 30
1883 #define FF_PROFILE_DTS_96_24 40
1884 #define FF_PROFILE_DTS_HD_HRA 50
1885 #define FF_PROFILE_DTS_HD_MA 60
1886 #define FF_PROFILE_DTS_EXPRESS 70
1887 
1888 #define FF_PROFILE_MPEG2_422 0
1889 #define FF_PROFILE_MPEG2_HIGH 1
1890 #define FF_PROFILE_MPEG2_SS 2
1891 #define FF_PROFILE_MPEG2_SNR_SCALABLE 3
1892 #define FF_PROFILE_MPEG2_MAIN 4
1893 #define FF_PROFILE_MPEG2_SIMPLE 5
1894 
1895 #define FF_PROFILE_H264_CONSTRAINED (1<<9) // 8+1; constraint_set1_flag
1896 #define FF_PROFILE_H264_INTRA (1<<11) // 8+3; constraint_set3_flag
1897 
1898 #define FF_PROFILE_H264_BASELINE 66
1899 #define FF_PROFILE_H264_CONSTRAINED_BASELINE (66|FF_PROFILE_H264_CONSTRAINED)
1900 #define FF_PROFILE_H264_MAIN 77
1901 #define FF_PROFILE_H264_EXTENDED 88
1902 #define FF_PROFILE_H264_HIGH 100
1903 #define FF_PROFILE_H264_HIGH_10 110
1904 #define FF_PROFILE_H264_HIGH_10_INTRA (110|FF_PROFILE_H264_INTRA)
1905 #define FF_PROFILE_H264_MULTIVIEW_HIGH 118
1906 #define FF_PROFILE_H264_HIGH_422 122
1907 #define FF_PROFILE_H264_HIGH_422_INTRA (122|FF_PROFILE_H264_INTRA)
1908 #define FF_PROFILE_H264_STEREO_HIGH 128
1909 #define FF_PROFILE_H264_HIGH_444 144
1910 #define FF_PROFILE_H264_HIGH_444_PREDICTIVE 244
1911 #define FF_PROFILE_H264_HIGH_444_INTRA (244|FF_PROFILE_H264_INTRA)
1912 #define FF_PROFILE_H264_CAVLC_444 44
1913 
1914 #define FF_PROFILE_VC1_SIMPLE 0
1915 #define FF_PROFILE_VC1_MAIN 1
1916 #define FF_PROFILE_VC1_COMPLEX 2
1917 #define FF_PROFILE_VC1_ADVANCED 3
1918 
1919 #define FF_PROFILE_MPEG4_SIMPLE 0
1920 #define FF_PROFILE_MPEG4_SIMPLE_SCALABLE 1
1921 #define FF_PROFILE_MPEG4_CORE 2
1922 #define FF_PROFILE_MPEG4_MAIN 3
1923 #define FF_PROFILE_MPEG4_N_BIT 4
1924 #define FF_PROFILE_MPEG4_SCALABLE_TEXTURE 5
1925 #define FF_PROFILE_MPEG4_SIMPLE_FACE_ANIMATION 6
1926 #define FF_PROFILE_MPEG4_BASIC_ANIMATED_TEXTURE 7
1927 #define FF_PROFILE_MPEG4_HYBRID 8
1928 #define FF_PROFILE_MPEG4_ADVANCED_REAL_TIME 9
1929 #define FF_PROFILE_MPEG4_CORE_SCALABLE 10
1930 #define FF_PROFILE_MPEG4_ADVANCED_CODING 11
1931 #define FF_PROFILE_MPEG4_ADVANCED_CORE 12
1932 #define FF_PROFILE_MPEG4_ADVANCED_SCALABLE_TEXTURE 13
1933 #define FF_PROFILE_MPEG4_SIMPLE_STUDIO 14
1934 #define FF_PROFILE_MPEG4_ADVANCED_SIMPLE 15
1935 
1936 #define FF_PROFILE_JPEG2000_CSTREAM_RESTRICTION_0 1
1937 #define FF_PROFILE_JPEG2000_CSTREAM_RESTRICTION_1 2
1938 #define FF_PROFILE_JPEG2000_CSTREAM_NO_RESTRICTION 32768
1939 #define FF_PROFILE_JPEG2000_DCINEMA_2K 3
1940 #define FF_PROFILE_JPEG2000_DCINEMA_4K 4
1941 
1942 #define FF_PROFILE_VP9_0 0
1943 #define FF_PROFILE_VP9_1 1
1944 #define FF_PROFILE_VP9_2 2
1945 #define FF_PROFILE_VP9_3 3
1946 
1947 #define FF_PROFILE_HEVC_MAIN 1
1948 #define FF_PROFILE_HEVC_MAIN_10 2
1949 #define FF_PROFILE_HEVC_MAIN_STILL_PICTURE 3
1950 #define FF_PROFILE_HEVC_REXT 4
1951 
1952 #define FF_PROFILE_AV1_MAIN 0
1953 #define FF_PROFILE_AV1_HIGH 1
1954 #define FF_PROFILE_AV1_PROFESSIONAL 2
1955 
1956 #define FF_PROFILE_MJPEG_HUFFMAN_BASELINE_DCT 0xc0
1957 #define FF_PROFILE_MJPEG_HUFFMAN_EXTENDED_SEQUENTIAL_DCT 0xc1
1958 #define FF_PROFILE_MJPEG_HUFFMAN_PROGRESSIVE_DCT 0xc2
1959 #define FF_PROFILE_MJPEG_HUFFMAN_LOSSLESS 0xc3
1960 #define FF_PROFILE_MJPEG_JPEG_LS 0xf7
1961 
1962 #define FF_PROFILE_SBC_MSBC 1
1963 
1964 #define FF_PROFILE_PRORES_PROXY 0
1965 #define FF_PROFILE_PRORES_LT 1
1966 #define FF_PROFILE_PRORES_STANDARD 2
1967 #define FF_PROFILE_PRORES_HQ 3
1968 #define FF_PROFILE_PRORES_4444 4
1969 #define FF_PROFILE_PRORES_XQ 5
1970 
1971 #define FF_PROFILE_ARIB_PROFILE_A 0
1972 #define FF_PROFILE_ARIB_PROFILE_C 1
1973 
1974 #define FF_PROFILE_KLVA_SYNC 0
1975 #define FF_PROFILE_KLVA_ASYNC 1
1976 
1977  /**
1978  * level
1979  * - encoding: Set by user.
1980  * - decoding: Set by libavcodec.
1981  */
1982  int level;
1983 #define FF_LEVEL_UNKNOWN -99
1984 
1985  /**
1986  * Skip loop filtering for selected frames.
1987  * - encoding: unused
1988  * - decoding: Set by user.
1989  */
1991 
1992  /**
1993  * Skip IDCT/dequantization for selected frames.
1994  * - encoding: unused
1995  * - decoding: Set by user.
1996  */
1997  enum AVDiscard skip_idct;
1998 
1999  /**
2000  * Skip decoding for selected frames.
2001  * - encoding: unused
2002  * - decoding: Set by user.
2003  */
2004  enum AVDiscard skip_frame;
2005 
2006  /**
2007  * Header containing style information for text subtitles.
2008  * For SUBTITLE_ASS subtitle type, it should contain the whole ASS
2009  * [Script Info] and [V4+ Styles] section, plus the [Events] line and
2010  * the Format line following. It shouldn't include any Dialogue line.
2011  * - encoding: Set/allocated/freed by user (before avcodec_open2())
2012  * - decoding: Set/allocated/freed by libavcodec (by avcodec_open2())
2013  */
2016 
2017 #if FF_API_VBV_DELAY
2018  /**
2019  * VBV delay coded in the last frame (in periods of a 27 MHz clock).
2020  * Used for compliant TS muxing.
2021  * - encoding: Set by libavcodec.
2022  * - decoding: unused.
2023  * @deprecated this value is now exported as a part of
2024  * AV_PKT_DATA_CPB_PROPERTIES packet side data
2025  */
2027  uint64_t vbv_delay;
2028 #endif
2029 
2030 #if FF_API_SIDEDATA_ONLY_PKT
2031  /**
2032  * Encoding only and set by default. Allow encoders to output packets
2033  * that do not contain any encoded data, only side data.
2034  *
2035  * Some encoders need to output such packets, e.g. to update some stream
2036  * parameters at the end of encoding.
2037  *
2038  * @deprecated this field disables the default behaviour and
2039  * it is kept only for compatibility.
2040  */
2043 #endif
2044 
2045  /**
2046  * Audio only. The number of "priming" samples (padding) inserted by the
2047  * encoder at the beginning of the audio. I.e. this number of leading
2048  * decoded samples must be discarded by the caller to get the original audio
2049  * without leading padding.
2050  *
2051  * - decoding: unused
2052  * - encoding: Set by libavcodec. The timestamps on the output packets are
2053  * adjusted by the encoder so that they always refer to the
2054  * first sample of the data actually contained in the packet,
2055  * including any added padding. E.g. if the timebase is
2056  * 1/samplerate and the timestamp of the first input sample is
2057  * 0, the timestamp of the first output packet will be
2058  * -initial_padding.
2059  */
2061 
2062  /**
2063  * - decoding: For codecs that store a framerate value in the compressed
2064  * bitstream, the decoder may export it here. { 0, 1} when
2065  * unknown.
2066  * - encoding: May be used to signal the framerate of CFR content to an
2067  * encoder.
2068  */
2070 
2071  /**
2072  * Nominal unaccelerated pixel format, see AV_PIX_FMT_xxx.
2073  * - encoding: unused.
2074  * - decoding: Set by libavcodec before calling get_format()
2075  */
2077 
2078  /**
2079  * Timebase in which pkt_dts/pts and AVPacket.dts/pts are.
2080  * - encoding unused.
2081  * - decoding set by user.
2082  */
2084 
2085  /**
2086  * AVCodecDescriptor
2087  * - encoding: unused.
2088  * - decoding: set by libavcodec.
2089  */
2091 
2092 #if !FF_API_LOWRES
2093  /**
2094  * low resolution decoding, 1-> 1/2 size, 2->1/4 size
2095  * - encoding: unused
2096  * - decoding: Set by user.
2097  */
2098  int lowres;
2099 #endif
2100 
2101  /**
2102  * Current statistics for PTS correction.
2103  * - decoding: maintained and used by libavcodec, not intended to be used by user apps
2104  * - encoding: unused
2105  */
2106  int64_t pts_correction_num_faulty_pts; /// Number of incorrect PTS values so far
2107  int64_t pts_correction_num_faulty_dts; /// Number of incorrect DTS values so far
2108  int64_t pts_correction_last_pts; /// PTS of the last frame
2109  int64_t pts_correction_last_dts; /// DTS of the last frame
2110 
2111  /**
2112  * Character encoding of the input subtitles file.
2113  * - decoding: set by user
2114  * - encoding: unused
2115  */
2117 
2118  /**
2119  * Subtitles character encoding mode. Formats or codecs might be adjusting
2120  * this setting (if they are doing the conversion themselves for instance).
2121  * - decoding: set by libavcodec
2122  * - encoding: unused
2123  */
2125 #define FF_SUB_CHARENC_MODE_DO_NOTHING -1 ///< do nothing (demuxer outputs a stream supposed to be already in UTF-8, or the codec is bitmap for instance)
2126 #define FF_SUB_CHARENC_MODE_AUTOMATIC 0 ///< libavcodec will select the mode itself
2127 #define FF_SUB_CHARENC_MODE_PRE_DECODER 1 ///< the AVPacket data needs to be recoded to UTF-8 before being fed to the decoder, requires iconv
2128 #define FF_SUB_CHARENC_MODE_IGNORE 2 ///< neither convert the subtitles, nor check them for valid UTF-8
2129 
2130  /**
2131  * Skip processing alpha if supported by codec.
2132  * Note that if the format uses pre-multiplied alpha (common with VP6,
2133  * and recommended due to better video quality/compression)
2134  * the image will look as if alpha-blended onto a black background.
2135  * However for formats that do not use pre-multiplied alpha
2136  * there might be serious artefacts (though e.g. libswscale currently
2137  * assumes pre-multiplied alpha anyway).
2138  *
2139  * - decoding: set by user
2140  * - encoding: unused
2141  */
2143 
2144  /**
2145  * Number of samples to skip after a discontinuity
2146  * - decoding: unused
2147  * - encoding: set by libavcodec
2148  */
2150 
2151 #if !FF_API_DEBUG_MV
2152  /**
2153  * debug motion vectors
2154  * - encoding: Set by user.
2155  * - decoding: Set by user.
2156  */
2158 #define FF_DEBUG_VIS_MV_P_FOR 0x00000001 //visualize forward predicted MVs of P frames
2159 #define FF_DEBUG_VIS_MV_B_FOR 0x00000002 //visualize forward predicted MVs of B frames
2160 #define FF_DEBUG_VIS_MV_B_BACK 0x00000004 //visualize backward predicted MVs of B frames
2161 #endif
2162 
2163  /**
2164  * custom intra quantization matrix
2165  * - encoding: Set by user, can be NULL.
2166  * - decoding: unused.
2167  */
2169 
2170  /**
2171  * dump format separator.
2172  * can be ", " or "\n " or anything else
2173  * - encoding: Set by user.
2174  * - decoding: Set by user.
2175  */
2176  uint8_t *dump_separator;
2177 
2178  /**
2179  * ',' separated list of allowed decoders.
2180  * If NULL then all are allowed
2181  * - encoding: unused
2182  * - decoding: set by user
2183  */
2185 
2186  /**
2187  * Properties of the stream that gets decoded
2188  * - encoding: unused
2189  * - decoding: set by libavcodec
2190  */
2191  unsigned properties;
2192 #define FF_CODEC_PROPERTY_LOSSLESS 0x00000001
2193 #define FF_CODEC_PROPERTY_CLOSED_CAPTIONS 0x00000002
2194 
2195  /**
2196  * Additional data associated with the entire coded stream.
2197  *
2198  * - decoding: unused
2199  * - encoding: may be set by libavcodec after avcodec_open2().
2200  */
2203 
2204  /**
2205  * A reference to the AVHWFramesContext describing the input (for encoding)
2206  * or output (decoding) frames. The reference is set by the caller and
2207  * afterwards owned (and freed) by libavcodec - it should never be read by
2208  * the caller after being set.
2209  *
2210  * - decoding: This field should be set by the caller from the get_format()
2211  * callback. The previous reference (if any) will always be
2212  * unreffed by libavcodec before the get_format() call.
2213  *
2214  * If the default get_buffer2() is used with a hwaccel pixel
2215  * format, then this AVHWFramesContext will be used for
2216  * allocating the frame buffers.
2217  *
2218  * - encoding: For hardware encoders configured to use a hwaccel pixel
2219  * format, this field should be set by the caller to a reference
2220  * to the AVHWFramesContext describing input frames.
2221  * AVHWFramesContext.format must be equal to
2222  * AVCodecContext.pix_fmt.
2223  *
2224  * This field should be set before avcodec_open2() is called.
2225  */
2227 
2228  /**
2229  * Control the form of AVSubtitle.rects[N]->ass
2230  * - decoding: set by user
2231  * - encoding: unused
2232  */
2234 #define FF_SUB_TEXT_FMT_ASS 0
2235 #if FF_API_ASS_TIMING
2236 #define FF_SUB_TEXT_FMT_ASS_WITH_TIMINGS 1
2237 #endif
2238 
2239  /**
2240  * Audio only. The amount of padding (in samples) appended by the encoder to
2241  * the end of the audio. I.e. this number of decoded samples must be
2242  * discarded by the caller from the end of the stream to get the original
2243  * audio without any trailing padding.
2244  *
2245  * - decoding: unused
2246  * - encoding: unused
2247  */
2249 
2250  /**
2251  * The number of pixels per image to maximally accept.
2252  *
2253  * - decoding: set by user
2254  * - encoding: set by user
2255  */
2256  int64_t max_pixels;
2257 
2258  /**
2259  * A reference to the AVHWDeviceContext describing the device which will
2260  * be used by a hardware encoder/decoder. The reference is set by the
2261  * caller and afterwards owned (and freed) by libavcodec.
2262  *
2263  * This should be used if either the codec device does not require
2264  * hardware frames or any that are used are to be allocated internally by
2265  * libavcodec. If the user wishes to supply any of the frames used as
2266  * encoder input or decoder output then hw_frames_ctx should be used
2267  * instead. When hw_frames_ctx is set in get_format() for a decoder, this
2268  * field will be ignored while decoding the associated stream segment, but
2269  * may again be used on a following one after another get_format() call.
2270  *
2271  * For both encoders and decoders this field should be set before
2272  * avcodec_open2() is called and must not be written to thereafter.
2273  *
2274  * Note that some decoders may require this field to be set initially in
2275  * order to support hw_frames_ctx at all - in that case, all frames
2276  * contexts used must be created on the same device.
2277  */
2279 
2280  /**
2281  * Bit set of AV_HWACCEL_FLAG_* flags, which affect hardware accelerated
2282  * decoding (if active).
2283  * - encoding: unused
2284  * - decoding: Set by user (either before avcodec_open2(), or in the
2285  * AVCodecContext.get_format callback)
2286  */
2288 
2289  /**
2290  * Video decoding only. Certain video codecs support cropping, meaning that
2291  * only a sub-rectangle of the decoded frame is intended for display. This
2292  * option controls how cropping is handled by libavcodec.
2293  *
2294  * When set to 1 (the default), libavcodec will apply cropping internally.
2295  * I.e. it will modify the output frame width/height fields and offset the
2296  * data pointers (only by as much as possible while preserving alignment, or
2297  * by the full amount if the AV_CODEC_FLAG_UNALIGNED flag is set) so that
2298  * the frames output by the decoder refer only to the cropped area. The
2299  * crop_* fields of the output frames will be zero.
2300  *
2301  * When set to 0, the width/height fields of the output frames will be set
2302  * to the coded dimensions and the crop_* fields will describe the cropping
2303  * rectangle. Applying the cropping is left to the caller.
2304  *
2305  * @warning When hardware acceleration with opaque output frames is used,
2306  * libavcodec is unable to apply cropping from the top/left border.
2307  *
2308  * @note when this option is set to zero, the width/height fields of the
2309  * AVCodecContext and output AVFrames have different meanings. The codec
2310  * context fields store display dimensions (with the coded dimensions in
2311  * coded_width/height), while the frame fields store the coded dimensions
2312  * (with the display dimensions being determined by the crop_* fields).
2313  */
2315 
2316  /*
2317  * Video decoding only. Sets the number of extra hardware frames which
2318  * the decoder will allocate for use by the caller. This must be set
2319  * before avcodec_open2() is called.
2320  *
2321  * Some hardware decoders require all frames that they will use for
2322  * output to be defined in advance before decoding starts. For such
2323  * decoders, the hardware frame pool must therefore be of a fixed size.
2324  * The extra frames set here are on top of any number that the decoder
2325  * needs internally in order to operate normally (for example, frames
2326  * used as reference pictures).
2327  */
2329 
2330  /**
2331  * The percentage of damaged samples to discard a frame.
2332  *
2333  * - decoding: set by user
2334  * - encoding: unused
2335  */
2337 
2338  /**
2339  * The number of samples per frame to maximally accept.
2340  *
2341  * - decoding: set by user
2342  * - encoding: set by user
2343  */
2344  int64_t max_samples;
2345 
2346  /**
2347  * Bit set of AV_CODEC_EXPORT_DATA_* flags, which affects the kind of
2348  * metadata exported in frame, packet, or coded stream side data by
2349  * decoders and encoders.
2350  *
2351  * - decoding: set by user
2352  * - encoding: set by user
2353  */
2355 } AVCodecContext;
2356 
2357 #if FF_API_CODEC_GET_SET
2358 /**
2359  * Accessors for some AVCodecContext fields. These used to be provided for ABI
2360  * compatibility, and do not need to be used anymore.
2361  */
2366 
2371 
2374 
2375 #if FF_API_LOWRES
2379 void av_codec_set_lowres(AVCodecContext *avctx, int val);
2380 #endif
2381 
2386 
2391 #endif
2392 
2393 struct AVSubtitle;
2394 
2395 #if FF_API_CODEC_GET_SET
2398 #endif
2399 
2400 struct MpegEncContext;
2401 
2402 /**
2403  * @defgroup lavc_hwaccel AVHWAccel
2404  *
2405  * @note Nothing in this structure should be accessed by the user. At some
2406  * point in future it will not be externally visible at all.
2407  *
2408  * @{
2409  */
2410 typedef struct AVHWAccel {
2411  /**
2412  * Name of the hardware accelerated codec.
2413  * The name is globally unique among encoders and among decoders (but an
2414  * encoder and a decoder can share the same name).
2415  */
2416  const char *name;
2417 
2418  /**
2419  * Type of codec implemented by the hardware accelerator.
2420  *
2421  * See AVMEDIA_TYPE_xxx
2422  */
2423  enum AVMediaType type;
2424 
2425  /**
2426  * Codec implemented by the hardware accelerator.
2427  *
2428  * See AV_CODEC_ID_xxx
2429  */
2430  enum AVCodecID id;
2431 
2432  /**
2433  * Supported pixel format.
2434  *
2435  * Only hardware accelerated formats are supported here.
2436  */
2437  enum AVPixelFormat pix_fmt;
2438 
2439  /**
2440  * Hardware accelerated codec capabilities.
2441  * see AV_HWACCEL_CODEC_CAP_*
2442  */
2444 
2445  /*****************************************************************
2446  * No fields below this line are part of the public API. They
2447  * may not be used outside of libavcodec and can be changed and
2448  * removed at will.
2449  * New public fields should be added right above.
2450  *****************************************************************
2451  */
2452 
2453  /**
2454  * Allocate a custom buffer
2455  */
2457 
2458  /**
2459  * Called at the beginning of each frame or field picture.
2460  *
2461  * Meaningful frame information (codec specific) is guaranteed to
2462  * be parsed at this point. This function is mandatory.
2463  *
2464  * Note that buf can be NULL along with buf_size set to 0.
2465  * Otherwise, this means the whole frame is available at this point.
2466  *
2467  * @param avctx the codec context
2468  * @param buf the frame data buffer base
2469  * @param buf_size the size of the frame in bytes
2470  * @return zero if successful, a negative value otherwise
2471  */
2472  int (*start_frame)(AVCodecContext *avctx, const uint8_t *buf, uint32_t buf_size);
2473 
2474  /**
2475  * Callback for parameter data (SPS/PPS/VPS etc).
2476  *
2477  * Useful for hardware decoders which keep persistent state about the
2478  * video parameters, and need to receive any changes to update that state.
2479  *
2480  * @param avctx the codec context
2481  * @param type the nal unit type
2482  * @param buf the nal unit data buffer
2483  * @param buf_size the size of the nal unit in bytes
2484  * @return zero if successful, a negative value otherwise
2485  */
2486  int (*decode_params)(AVCodecContext *avctx, int type, const uint8_t *buf, uint32_t buf_size);
2487 
2488  /**
2489  * Callback for each slice.
2490  *
2491  * Meaningful slice information (codec specific) is guaranteed to
2492  * be parsed at this point. This function is mandatory.
2493  * The only exception is XvMC, that works on MB level.
2494  *
2495  * @param avctx the codec context
2496  * @param buf the slice data buffer base
2497  * @param buf_size the size of the slice in bytes
2498  * @return zero if successful, a negative value otherwise
2499  */
2500  int (*decode_slice)(AVCodecContext *avctx, const uint8_t *buf, uint32_t buf_size);
2501 
2502  /**
2503  * Called at the end of each frame or field picture.
2504  *
2505  * The whole picture is parsed at this point and can now be sent
2506  * to the hardware accelerator. This function is mandatory.
2507  *
2508  * @param avctx the codec context
2509  * @return zero if successful, a negative value otherwise
2510  */
2511  int (*end_frame)(AVCodecContext *avctx);
2512 
2513  /**
2514  * Size of per-frame hardware accelerator private data.
2515  *
2516  * Private data is allocated with av_mallocz() before
2517  * AVCodecContext.get_buffer() and deallocated after
2518  * AVCodecContext.release_buffer().
2519  */
2521 
2522  /**
2523  * Called for every Macroblock in a slice.
2524  *
2525  * XvMC uses it to replace the ff_mpv_reconstruct_mb().
2526  * Instead of decoding to raw picture, MB parameters are
2527  * stored in an array provided by the video driver.
2528  *
2529  * @param s the mpeg context
2530  */
2531  void (*decode_mb)(struct MpegEncContext *s);
2532 
2533  /**
2534  * Initialize the hwaccel private data.
2535  *
2536  * This will be called from ff_get_format(), after hwaccel and
2537  * hwaccel_context are set and the hwaccel private data in AVCodecInternal
2538  * is allocated.
2539  */
2540  int (*init)(AVCodecContext *avctx);
2541 
2542  /**
2543  * Uninitialize the hwaccel private data.
2544  *
2545  * This will be called from get_format() or avcodec_close(), after hwaccel
2546  * and hwaccel_context are already uninitialized.
2547  */
2548  int (*uninit)(AVCodecContext *avctx);
2549 
2550  /**
2551  * Size of the private data to allocate in
2552  * AVCodecInternal.hwaccel_priv_data.
2553  */
2555 
2556  /**
2557  * Internal hwaccel capabilities.
2558  */
2560 
2561  /**
2562  * Fill the given hw_frames context with current codec parameters. Called
2563  * from get_format. Refer to avcodec_get_hw_frames_parameters() for
2564  * details.
2565  *
2566  * This CAN be called before AVHWAccel.init is called, and you must assume
2567  * that avctx->hwaccel_priv_data is invalid.
2568  */
2569  int (*frame_params)(AVCodecContext *avctx, AVBufferRef *hw_frames_ctx);
2570 
2571  /**
2572  * Called if parsing fails
2573  *
2574  * An error has occured, end_frame will not be called
2575  * start_frame & decode_slice may or may not have been called
2576  * Optional
2577  *
2578  * @param avctx the codec context
2579  */
2580  void (*abort_frame)(AVCodecContext *avctx);
2581 } AVHWAccel;
2582 
2583 /**
2584  * HWAccel is experimental and is thus avoided in favor of non experimental
2585  * codecs
2586  */
2587 #define AV_HWACCEL_CODEC_CAP_EXPERIMENTAL 0x0200
2588 
2589 /**
2590  * Hardware acceleration should be used for decoding even if the codec level
2591  * used is unknown or higher than the maximum supported level reported by the
2592  * hardware driver.
2593  *
2594  * It's generally a good idea to pass this flag unless you have a specific
2595  * reason not to, as hardware tends to under-report supported levels.
2596  */
2597 #define AV_HWACCEL_FLAG_IGNORE_LEVEL (1 << 0)
2598 
2599 /**
2600  * Hardware acceleration can output YUV pixel formats with a different chroma
2601  * sampling than 4:2:0 and/or other than 8 bits per component.
2602  */
2603 #define AV_HWACCEL_FLAG_ALLOW_HIGH_DEPTH (1 << 1)
2604 
2605 /**
2606  * Hardware acceleration should still be attempted for decoding when the
2607  * codec profile does not match the reported capabilities of the hardware.
2608  *
2609  * For example, this can be used to try to decode baseline profile H.264
2610  * streams in hardware - it will often succeed, because many streams marked
2611  * as baseline profile actually conform to constrained baseline profile.
2612  *
2613  * @warning If the stream is actually not supported then the behaviour is
2614  * undefined, and may include returning entirely incorrect output
2615  * while indicating success.
2616  */
2617 #define AV_HWACCEL_FLAG_ALLOW_PROFILE_MISMATCH (1 << 2)
2618 
2619 /**
2620  * @}
2621  */
2622 
2623 #if FF_API_AVPICTURE
2624 /**
2625  * @defgroup lavc_picture AVPicture
2626  *
2627  * Functions for working with AVPicture
2628  * @{
2629  */
2630 
2631 /**
2632  * Picture data structure.
2633  *
2634  * Up to four components can be stored into it, the last component is
2635  * alpha.
2636  * @deprecated use AVFrame or imgutils functions instead
2637  */
2638 typedef struct AVPicture {
2640  uint8_t *data[AV_NUM_DATA_POINTERS]; ///< pointers to the image data planes
2642  int linesize[AV_NUM_DATA_POINTERS]; ///< number of bytes per line
2643 } AVPicture;
2644 
2645 /**
2646  * @}
2647  */
2648 #endif
2649 
2652 
2653  SUBTITLE_BITMAP, ///< A bitmap, pict will be set
2654 
2655  /**
2656  * Plain text, the text field must be set by the decoder and is
2657  * authoritative. ass and pict fields may contain approximations.
2658  */
2660 
2661  /**
2662  * Formatted text, the ass field must be set by the decoder and is
2663  * authoritative. pict and text fields may contain approximations.
2664  */
2666 };
2667 
2668 #define AV_SUBTITLE_FLAG_FORCED 0x00000001
2669 
2670 typedef struct AVSubtitleRect {
2671  int x; ///< top left corner of pict, undefined when pict is not set
2672  int y; ///< top left corner of pict, undefined when pict is not set
2673  int w; ///< width of pict, undefined when pict is not set
2674  int h; ///< height of pict, undefined when pict is not set
2675  int nb_colors; ///< number of colors in pict, undefined when pict is not set
2676 
2677 #if FF_API_AVPICTURE
2678  /**
2679  * @deprecated unused
2680  */
2683 #endif
2684  /**
2685  * data+linesize for the bitmap of this subtitle.
2686  * Can be set for text/ass as well once they are rendered.
2687  */
2688  uint8_t *data[4];
2689  int linesize[4];
2690 
2691  enum AVSubtitleType type;
2692 
2693  char *text; ///< 0 terminated plain UTF-8 text
2694 
2695  /**
2696  * 0 terminated ASS/SSA compatible event line.
2697  * The presentation of this is unaffected by the other values in this
2698  * struct.
2699  */
2700  char *ass;
2701 
2702  int flags;
2703 } AVSubtitleRect;
2704 
2705 typedef struct AVSubtitle {
2706  uint16_t format; /* 0 = graphics */
2707  uint32_t start_display_time; /* relative to packet pts, in ms */
2708  uint32_t end_display_time; /* relative to packet pts, in ms */
2709  unsigned num_rects;
2711  int64_t pts; ///< Same as packet pts, in AV_TIME_BASE
2712 } AVSubtitle;
2713 
2714 #if FF_API_NEXT
2715 /**
2716  * If c is NULL, returns the first registered codec,
2717  * if c is non-NULL, returns the next registered codec after c,
2718  * or NULL if c is the last one.
2719  */
2722 #endif
2723 
2724 /**
2725  * Return the LIBAVCODEC_VERSION_INT constant.
2726  */
2727 unsigned avcodec_version(void);
2728 
2729 /**
2730  * Return the libavcodec build-time configuration.
2731  */
2732 const char *avcodec_configuration(void);
2733 
2734 /**
2735  * Return the libavcodec license.
2736  */
2737 const char *avcodec_license(void);
2738 
2739 #if FF_API_NEXT
2740 /**
2741  * Register the codec codec and initialize libavcodec.
2742  *
2743  * @warning either this function or avcodec_register_all() must be called
2744  * before any other libavcodec functions.
2745  *
2746  * @see avcodec_register_all()
2747  */
2750 
2751 /**
2752  * Register all the codecs, parsers and bitstream filters which were enabled at
2753  * configuration time. If you do not call this function you can select exactly
2754  * which formats you want to support, by using the individual registration
2755  * functions.
2756  *
2757  * @see avcodec_register
2758  * @see av_register_codec_parser
2759  * @see av_register_bitstream_filter
2760  */
2763 #endif
2764 
2765 /**
2766  * Allocate an AVCodecContext and set its fields to default values. The
2767  * resulting struct should be freed with avcodec_free_context().
2768  *
2769  * @param codec if non-NULL, allocate private data and initialize defaults
2770  * for the given codec. It is illegal to then call avcodec_open2()
2771  * with a different codec.
2772  * If NULL, then the codec-specific defaults won't be initialized,
2773  * which may result in suboptimal default settings (this is
2774  * important mainly for encoders, e.g. libx264).
2775  *
2776  * @return An AVCodecContext filled with default values or NULL on failure.
2777  */
2779 
2780 /**
2781  * Free the codec context and everything associated with it and write NULL to
2782  * the provided pointer.
2783  */
2785 
2786 #if FF_API_GET_CONTEXT_DEFAULTS
2787 /**
2788  * @deprecated This function should not be used, as closing and opening a codec
2789  * context multiple time is not supported. A new codec context should be
2790  * allocated for each new use.
2791  */
2793 #endif
2794 
2795 /**
2796  * Get the AVClass for AVCodecContext. It can be used in combination with
2797  * AV_OPT_SEARCH_FAKE_OBJ for examining options.
2798  *
2799  * @see av_opt_find().
2800  */
2802 
2803 #if FF_API_COPY_CONTEXT
2804 /**
2805  * Get the AVClass for AVFrame. It can be used in combination with
2806  * AV_OPT_SEARCH_FAKE_OBJ for examining options.
2807  *
2808  * @see av_opt_find().
2809  */
2811 
2812 /**
2813  * Get the AVClass for AVSubtitleRect. It can be used in combination with
2814  * AV_OPT_SEARCH_FAKE_OBJ for examining options.
2815  *
2816  * @see av_opt_find().
2817  */
2819 
2820 /**
2821  * Copy the settings of the source AVCodecContext into the destination
2822  * AVCodecContext. The resulting destination codec context will be
2823  * unopened, i.e. you are required to call avcodec_open2() before you
2824  * can use this AVCodecContext to decode/encode video/audio data.
2825  *
2826  * @param dest target codec context, should be initialized with
2827  * avcodec_alloc_context3(NULL), but otherwise uninitialized
2828  * @param src source codec context
2829  * @return AVERROR() on error (e.g. memory allocation error), 0 on success
2830  *
2831  * @deprecated The semantics of this function are ill-defined and it should not
2832  * be used. If you need to transfer the stream parameters from one codec context
2833  * to another, use an intermediate AVCodecParameters instance and the
2834  * avcodec_parameters_from_context() / avcodec_parameters_to_context()
2835  * functions.
2836  */
2839 #endif
2840 
2841 /**
2842  * Fill the parameters struct based on the values from the supplied codec
2843  * context. Any allocated fields in par are freed and replaced with duplicates
2844  * of the corresponding fields in codec.
2845  *
2846  * @return >= 0 on success, a negative AVERROR code on failure
2847  */
2849  const AVCodecContext *codec);
2850 
2851 /**
2852  * Fill the codec context based on the values from the supplied codec
2853  * parameters. Any allocated fields in codec that have a corresponding field in
2854  * par are freed and replaced with duplicates of the corresponding field in par.
2855  * Fields in codec that do not have a counterpart in par are not touched.
2856  *
2857  * @return >= 0 on success, a negative AVERROR code on failure.
2858  */
2860  const AVCodecParameters *par);
2861 
2862 /**
2863  * Initialize the AVCodecContext to use the given AVCodec. Prior to using this
2864  * function the context has to be allocated with avcodec_alloc_context3().
2865  *
2866  * The functions avcodec_find_decoder_by_name(), avcodec_find_encoder_by_name(),
2867  * avcodec_find_decoder() and avcodec_find_encoder() provide an easy way for
2868  * retrieving a codec.
2869  *
2870  * @warning This function is not thread safe!
2871  *
2872  * @note Always call this function before using decoding routines (such as
2873  * @ref avcodec_receive_frame()).
2874  *
2875  * @code
2876  * avcodec_register_all();
2877  * av_dict_set(&opts, "b", "2.5M", 0);
2878  * codec = avcodec_find_decoder(AV_CODEC_ID_H264);
2879  * if (!codec)
2880  * exit(1);
2881  *
2882  * context = avcodec_alloc_context3(codec);
2883  *
2884  * if (avcodec_open2(context, codec, opts) < 0)
2885  * exit(1);
2886  * @endcode
2887  *
2888  * @param avctx The context to initialize.
2889  * @param codec The codec to open this context for. If a non-NULL codec has been
2890  * previously passed to avcodec_alloc_context3() or
2891  * for this context, then this parameter MUST be either NULL or
2892  * equal to the previously passed codec.
2893  * @param options A dictionary filled with AVCodecContext and codec-private options.
2894  * On return this object will be filled with options that were not found.
2895  *
2896  * @return zero on success, a negative value on error
2897  * @see avcodec_alloc_context3(), avcodec_find_decoder(), avcodec_find_encoder(),
2898  * av_dict_set(), av_opt_find().
2899  */
2900 int avcodec_open2(AVCodecContext *avctx, const AVCodec *codec, AVDictionary **options);
2901 
2902 /**
2903  * Close a given AVCodecContext and free all the data associated with it
2904  * (but not the AVCodecContext itself).
2905  *
2906  * Calling this function on an AVCodecContext that hasn't been opened will free
2907  * the codec-specific data allocated in avcodec_alloc_context3() with a non-NULL
2908  * codec. Subsequent calls will do nothing.
2909  *
2910  * @note Do not use this function. Use avcodec_free_context() to destroy a
2911  * codec context (either open or closed). Opening and closing a codec context
2912  * multiple times is not supported anymore -- use multiple codec contexts
2913  * instead.
2914  */
2916 
2917 /**
2918  * Free all allocated data in the given subtitle struct.
2919  *
2920  * @param sub AVSubtitle to free.
2921  */
2923 
2924 /**
2925  * @}
2926  */
2927 
2928 /**
2929  * @addtogroup lavc_decoding
2930  * @{
2931  */
2932 
2933 /**
2934  * The default callback for AVCodecContext.get_buffer2(). It is made public so
2935  * it can be called by custom get_buffer2() implementations for decoders without
2936  * AV_CODEC_CAP_DR1 set.
2937  */
2939 
2940 /**
2941  * Modify width and height values so that they will result in a memory
2942  * buffer that is acceptable for the codec if you do not use any horizontal
2943  * padding.
2944  *
2945  * May only be used if a codec with AV_CODEC_CAP_DR1 has been opened.
2946  */
2948 
2949 /**
2950  * Modify width and height values so that they will result in a memory
2951  * buffer that is acceptable for the codec if you also ensure that all
2952  * line sizes are a multiple of the respective linesize_align[i].
2953  *
2954  * May only be used if a codec with AV_CODEC_CAP_DR1 has been opened.
2955  */
2957  int linesize_align[AV_NUM_DATA_POINTERS]);
2958 
2959 /**
2960  * Converts AVChromaLocation to swscale x/y chroma position.
2961  *
2962  * The positions represent the chroma (0,0) position in a coordinates system
2963  * with luma (0,0) representing the origin and luma(1,1) representing 256,256
2964  *
2965  * @param xpos horizontal chroma sample position
2966  * @param ypos vertical chroma sample position
2967  */
2968 int avcodec_enum_to_chroma_pos(int *xpos, int *ypos, enum AVChromaLocation pos);
2969 
2970 /**
2971  * Converts swscale x/y chroma position to AVChromaLocation.
2972  *
2973  * The positions represent the chroma (0,0) position in a coordinates system
2974  * with luma (0,0) representing the origin and luma(1,1) representing 256,256
2975  *
2976  * @param xpos horizontal chroma sample position
2977  * @param ypos vertical chroma sample position
2978  */
2979 enum AVChromaLocation avcodec_chroma_pos_to_enum(int xpos, int ypos);
2980 
2981 /**
2982  * Decode the audio frame of size avpkt->size from avpkt->data into frame.
2983  *
2984  * Some decoders may support multiple frames in a single AVPacket. Such
2985  * decoders would then just decode the first frame and the return value would be
2986  * less than the packet size. In this case, avcodec_decode_audio4 has to be
2987  * called again with an AVPacket containing the remaining data in order to
2988  * decode the second frame, etc... Even if no frames are returned, the packet
2989  * needs to be fed to the decoder with remaining data until it is completely
2990  * consumed or an error occurs.
2991  *
2992  * Some decoders (those marked with AV_CODEC_CAP_DELAY) have a delay between input
2993  * and output. This means that for some packets they will not immediately
2994  * produce decoded output and need to be flushed at the end of decoding to get
2995  * all the decoded data. Flushing is done by calling this function with packets
2996  * with avpkt->data set to NULL and avpkt->size set to 0 until it stops
2997  * returning samples. It is safe to flush even those decoders that are not
2998  * marked with AV_CODEC_CAP_DELAY, then no samples will be returned.
2999  *
3000  * @warning The input buffer, avpkt->data must be AV_INPUT_BUFFER_PADDING_SIZE
3001  * larger than the actual read bytes because some optimized bitstream
3002  * readers read 32 or 64 bits at once and could read over the end.
3003  *
3004  * @note The AVCodecContext MUST have been opened with @ref avcodec_open2()
3005  * before packets may be fed to the decoder.
3006  *
3007  * @param avctx the codec context
3008  * @param[out] frame The AVFrame in which to store decoded audio samples.
3009  * The decoder will allocate a buffer for the decoded frame by
3010  * calling the AVCodecContext.get_buffer2() callback.
3011  * When AVCodecContext.refcounted_frames is set to 1, the frame is
3012  * reference counted and the returned reference belongs to the
3013  * caller. The caller must release the frame using av_frame_unref()
3014  * when the frame is no longer needed. The caller may safely write
3015  * to the frame if av_frame_is_writable() returns 1.
3016  * When AVCodecContext.refcounted_frames is set to 0, the returned
3017  * reference belongs to the decoder and is valid only until the
3018  * next call to this function or until closing or flushing the
3019  * decoder. The caller may not write to it.
3020  * @param[out] got_frame_ptr Zero if no frame could be decoded, otherwise it is
3021  * non-zero. Note that this field being set to zero
3022  * does not mean that an error has occurred. For
3023  * decoders with AV_CODEC_CAP_DELAY set, no given decode
3024  * call is guaranteed to produce a frame.
3025  * @param[in] avpkt The input AVPacket containing the input buffer.
3026  * At least avpkt->data and avpkt->size should be set. Some
3027  * decoders might also require additional fields to be set.
3028  * @return A negative error code is returned if an error occurred during
3029  * decoding, otherwise the number of bytes consumed from the input
3030  * AVPacket is returned.
3031  *
3032 * @deprecated Use avcodec_send_packet() and avcodec_receive_frame().
3033  */
3036  int *got_frame_ptr, const AVPacket *avpkt);
3037 
3038 /**
3039  * Decode the video frame of size avpkt->size from avpkt->data into picture.
3040  * Some decoders may support multiple frames in a single AVPacket, such
3041  * decoders would then just decode the first frame.
3042  *
3043  * @warning The input buffer must be AV_INPUT_BUFFER_PADDING_SIZE larger than
3044  * the actual read bytes because some optimized bitstream readers read 32 or 64
3045  * bits at once and could read over the end.
3046  *
3047  * @warning The end of the input buffer buf should be set to 0 to ensure that
3048  * no overreading happens for damaged MPEG streams.
3049  *
3050  * @note Codecs which have the AV_CODEC_CAP_DELAY capability set have a delay
3051  * between input and output, these need to be fed with avpkt->data=NULL,
3052  * avpkt->size=0 at the end to return the remaining frames.
3053  *
3054  * @note The AVCodecContext MUST have been opened with @ref avcodec_open2()
3055  * before packets may be fed to the decoder.
3056  *
3057  * @param avctx the codec context
3058  * @param[out] picture The AVFrame in which the decoded video frame will be stored.
3059  * Use av_frame_alloc() to get an AVFrame. The codec will
3060  * allocate memory for the actual bitmap by calling the
3061  * AVCodecContext.get_buffer2() callback.
3062  * When AVCodecContext.refcounted_frames is set to 1, the frame is
3063  * reference counted and the returned reference belongs to the
3064  * caller. The caller must release the frame using av_frame_unref()
3065  * when the frame is no longer needed. The caller may safely write
3066  * to the frame if av_frame_is_writable() returns 1.
3067  * When AVCodecContext.refcounted_frames is set to 0, the returned
3068  * reference belongs to the decoder and is valid only until the
3069  * next call to this function or until closing or flushing the
3070  * decoder. The caller may not write to it.
3071  *
3072  * @param[in] avpkt The input AVPacket containing the input buffer.
3073  * You can create such packet with av_init_packet() and by then setting
3074  * data and size, some decoders might in addition need other fields like
3075  * flags&AV_PKT_FLAG_KEY. All decoders are designed to use the least
3076  * fields possible.
3077  * @param[in,out] got_picture_ptr Zero if no frame could be decompressed, otherwise, it is nonzero.
3078  * @return On error a negative value is returned, otherwise the number of bytes
3079  * used or zero if no frame could be decompressed.
3080  *
3081  * @deprecated Use avcodec_send_packet() and avcodec_receive_frame().
3082  */
3085  int *got_picture_ptr,
3086  const AVPacket *avpkt);
3087 
3088 /**
3089  * Decode a subtitle message.
3090  * Return a negative value on error, otherwise return the number of bytes used.
3091  * If no subtitle could be decompressed, got_sub_ptr is zero.
3092  * Otherwise, the subtitle is stored in *sub.
3093  * Note that AV_CODEC_CAP_DR1 is not available for subtitle codecs. This is for
3094  * simplicity, because the performance difference is expected to be negligible
3095  * and reusing a get_buffer written for video codecs would probably perform badly
3096  * due to a potentially very different allocation pattern.
3097  *
3098  * Some decoders (those marked with AV_CODEC_CAP_DELAY) have a delay between input
3099  * and output. This means that for some packets they will not immediately
3100  * produce decoded output and need to be flushed at the end of decoding to get
3101  * all the decoded data. Flushing is done by calling this function with packets
3102  * with avpkt->data set to NULL and avpkt->size set to 0 until it stops
3103  * returning subtitles. It is safe to flush even those decoders that are not
3104  * marked with AV_CODEC_CAP_DELAY, then no subtitles will be returned.
3105  *
3106  * @note The AVCodecContext MUST have been opened with @ref avcodec_open2()
3107  * before packets may be fed to the decoder.
3108  *
3109  * @param avctx the codec context
3110  * @param[out] sub The preallocated AVSubtitle in which the decoded subtitle will be stored,
3111  * must be freed with avsubtitle_free if *got_sub_ptr is set.
3112  * @param[in,out] got_sub_ptr Zero if no subtitle could be decompressed, otherwise, it is nonzero.
3113  * @param[in] avpkt The input AVPacket containing the input buffer.
3114  */
3116  int *got_sub_ptr,
3117  AVPacket *avpkt);
3118 
3119 /**
3120  * Supply raw packet data as input to a decoder.
3121  *
3122  * Internally, this call will copy relevant AVCodecContext fields, which can
3123  * influence decoding per-packet, and apply them when the packet is actually
3124  * decoded. (For example AVCodecContext.skip_frame, which might direct the
3125  * decoder to drop the frame contained by the packet sent with this function.)
3126  *
3127  * @warning The input buffer, avpkt->data must be AV_INPUT_BUFFER_PADDING_SIZE
3128  * larger than the actual read bytes because some optimized bitstream
3129  * readers read 32 or 64 bits at once and could read over the end.
3130  *
3131  * @warning Do not mix this API with the legacy API (like avcodec_decode_video2())
3132  * on the same AVCodecContext. It will return unexpected results now
3133  * or in future libavcodec versions.
3134  *
3135  * @note The AVCodecContext MUST have been opened with @ref avcodec_open2()
3136  * before packets may be fed to the decoder.
3137  *
3138  * @param avctx codec context
3139  * @param[in] avpkt The input AVPacket. Usually, this will be a single video
3140  * frame, or several complete audio frames.
3141  * Ownership of the packet remains with the caller, and the
3142  * decoder will not write to the packet. The decoder may create
3143  * a reference to the packet data (or copy it if the packet is
3144  * not reference-counted).
3145  * Unlike with older APIs, the packet is always fully consumed,
3146  * and if it contains multiple frames (e.g. some audio codecs),
3147  * will require you to call avcodec_receive_frame() multiple
3148  * times afterwards before you can send a new packet.
3149  * It can be NULL (or an AVPacket with data set to NULL and
3150  * size set to 0); in this case, it is considered a flush
3151  * packet, which signals the end of the stream. Sending the
3152  * first flush packet will return success. Subsequent ones are
3153  * unnecessary and will return AVERROR_EOF. If the decoder
3154  * still has frames buffered, it will return them after sending
3155  * a flush packet.
3156  *
3157  * @return 0 on success, otherwise negative error code:
3158  * AVERROR(EAGAIN): input is not accepted in the current state - user
3159  * must read output with avcodec_receive_frame() (once
3160  * all output is read, the packet should be resent, and
3161  * the call will not fail with EAGAIN).
3162  * AVERROR_EOF: the decoder has been flushed, and no new packets can
3163  * be sent to it (also returned if more than 1 flush
3164  * packet is sent)
3165  * AVERROR(EINVAL): codec not opened, it is an encoder, or requires flush
3166  * AVERROR(ENOMEM): failed to add packet to internal queue, or similar
3167  * other errors: legitimate decoding errors
3168  */
3169 int avcodec_send_packet(AVCodecContext *avctx, const AVPacket *avpkt);
3170 
3171 /**
3172  * Return decoded output data from a decoder.
3173  *
3174  * @param avctx codec context
3175  * @param frame This will be set to a reference-counted video or audio
3176  * frame (depending on the decoder type) allocated by the
3177  * decoder. Note that the function will always call
3178  * av_frame_unref(frame) before doing anything else.
3179  *
3180  * @return
3181  * 0: success, a frame was returned
3182  * AVERROR(EAGAIN): output is not available in this state - user must try
3183  * to send new input
3184  * AVERROR_EOF: the decoder has been fully flushed, and there will be
3185  * no more output frames
3186  * AVERROR(EINVAL): codec not opened, or it is an encoder
3187  * AVERROR_INPUT_CHANGED: current decoded frame has changed parameters
3188  * with respect to first decoded frame. Applicable
3189  * when flag AV_CODEC_FLAG_DROPCHANGED is set.
3190  * other negative values: legitimate decoding errors
3191  */
3193 
3194 /**
3195  * Supply a raw video or audio frame to the encoder. Use avcodec_receive_packet()
3196  * to retrieve buffered output packets.
3197  *
3198  * @param avctx codec context
3199  * @param[in] frame AVFrame containing the raw audio or video frame to be encoded.
3200  * Ownership of the frame remains with the caller, and the
3201  * encoder will not write to the frame. The encoder may create
3202  * a reference to the frame data (or copy it if the frame is
3203  * not reference-counted).
3204  * It can be NULL, in which case it is considered a flush
3205  * packet. This signals the end of the stream. If the encoder
3206  * still has packets buffered, it will return them after this
3207  * call. Once flushing mode has been entered, additional flush
3208  * packets are ignored, and sending frames will return
3209  * AVERROR_EOF.
3210  *
3211  * For audio:
3212  * If AV_CODEC_CAP_VARIABLE_FRAME_SIZE is set, then each frame
3213  * can have any number of samples.
3214  * If it is not set, frame->nb_samples must be equal to
3215  * avctx->frame_size for all frames except the last.
3216  * The final frame may be smaller than avctx->frame_size.
3217  * @return 0 on success, otherwise negative error code:
3218  * AVERROR(EAGAIN): input is not accepted in the current state - user
3219  * must read output with avcodec_receive_packet() (once
3220  * all output is read, the packet should be resent, and
3221  * the call will not fail with EAGAIN).
3222  * AVERROR_EOF: the encoder has been flushed, and no new frames can
3223  * be sent to it
3224  * AVERROR(EINVAL): codec not opened, refcounted_frames not set, it is a
3225  * decoder, or requires flush
3226  * AVERROR(ENOMEM): failed to add packet to internal queue, or similar
3227  * other errors: legitimate encoding errors
3228  */
3230 
3231 /**
3232  * Read encoded data from the encoder.
3233  *
3234  * @param avctx codec context
3235  * @param avpkt This will be set to a reference-counted packet allocated by the
3236  * encoder. Note that the function will always call
3237  * av_packet_unref(avpkt) before doing anything else.
3238  * @return 0 on success, otherwise negative error code:
3239  * AVERROR(EAGAIN): output is not available in the current state - user
3240  * must try to send input
3241  * AVERROR_EOF: the encoder has been fully flushed, and there will be
3242  * no more output packets
3243  * AVERROR(EINVAL): codec not opened, or it is a decoder
3244  * other errors: legitimate encoding errors
3245  */
3247 
3248 /**
3249  * Create and return a AVHWFramesContext with values adequate for hardware
3250  * decoding. This is meant to get called from the get_format callback, and is
3251  * a helper for preparing a AVHWFramesContext for AVCodecContext.hw_frames_ctx.
3252  * This API is for decoding with certain hardware acceleration modes/APIs only.
3253  *
3254  * The returned AVHWFramesContext is not initialized. The caller must do this
3255  * with av_hwframe_ctx_init().
3256  *
3257  * Calling this function is not a requirement, but makes it simpler to avoid
3258  * codec or hardware API specific details when manually allocating frames.
3259  *
3260  * Alternatively to this, an API user can set AVCodecContext.hw_device_ctx,
3261  * which sets up AVCodecContext.hw_frames_ctx fully automatically, and makes
3262  * it unnecessary to call this function or having to care about
3263  * AVHWFramesContext initialization at all.
3264  *
3265  * There are a number of requirements for calling this function:
3266  *
3267  * - It must be called from get_format with the same avctx parameter that was
3268  * passed to get_format. Calling it outside of get_format is not allowed, and
3269  * can trigger undefined behavior.
3270  * - The function is not always supported (see description of return values).
3271  * Even if this function returns successfully, hwaccel initialization could
3272  * fail later. (The degree to which implementations check whether the stream
3273  * is actually supported varies. Some do this check only after the user's
3274  * get_format callback returns.)
3275  * - The hw_pix_fmt must be one of the choices suggested by get_format. If the
3276  * user decides to use a AVHWFramesContext prepared with this API function,
3277  * the user must return the same hw_pix_fmt from get_format.
3278  * - The device_ref passed to this function must support the given hw_pix_fmt.
3279  * - After calling this API function, it is the user's responsibility to
3280  * initialize the AVHWFramesContext (returned by the out_frames_ref parameter),
3281  * and to set AVCodecContext.hw_frames_ctx to it. If done, this must be done
3282  * before returning from get_format (this is implied by the normal
3283  * AVCodecContext.hw_frames_ctx API rules).
3284  * - The AVHWFramesContext parameters may change every time time get_format is
3285  * called. Also, AVCodecContext.hw_frames_ctx is reset before get_format. So
3286  * you are inherently required to go through this process again on every
3287  * get_format call.
3288  * - It is perfectly possible to call this function without actually using
3289  * the resulting AVHWFramesContext. One use-case might be trying to reuse a
3290  * previously initialized AVHWFramesContext, and calling this API function
3291  * only to test whether the required frame parameters have changed.
3292  * - Fields that use dynamically allocated values of any kind must not be set
3293  * by the user unless setting them is explicitly allowed by the documentation.
3294  * If the user sets AVHWFramesContext.free and AVHWFramesContext.user_opaque,
3295  * the new free callback must call the potentially set previous free callback.
3296  * This API call may set any dynamically allocated fields, including the free
3297  * callback.
3298  *
3299  * The function will set at least the following fields on AVHWFramesContext
3300  * (potentially more, depending on hwaccel API):
3301  *
3302  * - All fields set by av_hwframe_ctx_alloc().
3303  * - Set the format field to hw_pix_fmt.
3304  * - Set the sw_format field to the most suited and most versatile format. (An
3305  * implication is that this will prefer generic formats over opaque formats
3306  * with arbitrary restrictions, if possible.)
3307  * - Set the width/height fields to the coded frame size, rounded up to the
3308  * API-specific minimum alignment.
3309  * - Only _if_ the hwaccel requires a pre-allocated pool: set the initial_pool_size
3310  * field to the number of maximum reference surfaces possible with the codec,
3311  * plus 1 surface for the user to work (meaning the user can safely reference
3312  * at most 1 decoded surface at a time), plus additional buffering introduced
3313  * by frame threading. If the hwaccel does not require pre-allocation, the
3314  * field is left to 0, and the decoder will allocate new surfaces on demand
3315  * during decoding.
3316  * - Possibly AVHWFramesContext.hwctx fields, depending on the underlying
3317  * hardware API.
3318  *
3319  * Essentially, out_frames_ref returns the same as av_hwframe_ctx_alloc(), but
3320  * with basic frame parameters set.
3321  *
3322  * The function is stateless, and does not change the AVCodecContext or the
3323  * device_ref AVHWDeviceContext.
3324  *
3325  * @param avctx The context which is currently calling get_format, and which
3326  * implicitly contains all state needed for filling the returned
3327  * AVHWFramesContext properly.
3328  * @param device_ref A reference to the AVHWDeviceContext describing the device
3329  * which will be used by the hardware decoder.
3330  * @param hw_pix_fmt The hwaccel format you are going to return from get_format.
3331  * @param out_frames_ref On success, set to a reference to an _uninitialized_
3332  * AVHWFramesContext, created from the given device_ref.
3333  * Fields will be set to values required for decoding.
3334  * Not changed if an error is returned.
3335  * @return zero on success, a negative value on error. The following error codes
3336  * have special semantics:
3337  * AVERROR(ENOENT): the decoder does not support this functionality. Setup
3338  * is always manual, or it is a decoder which does not
3339  * support setting AVCodecContext.hw_frames_ctx at all,
3340  * or it is a software format.
3341  * AVERROR(EINVAL): it is known that hardware decoding is not supported for
3342  * this configuration, or the device_ref is not supported
3343  * for the hwaccel referenced by hw_pix_fmt.
3344  */
3346  AVBufferRef *device_ref,
3348  AVBufferRef **out_frames_ref);
3349 
3350 
3351 
3352 /**
3353  * @defgroup lavc_parsing Frame parsing
3354  * @{
3355  */
3356 
3359  AV_PICTURE_STRUCTURE_TOP_FIELD, //< coded as top field
3360  AV_PICTURE_STRUCTURE_BOTTOM_FIELD, //< coded as bottom field
3361  AV_PICTURE_STRUCTURE_FRAME, //< coded as frame
3362 };
3363 
3364 typedef struct AVCodecParserContext {
3365  void *priv_data;
3367  int64_t frame_offset; /* offset of the current frame */
3368  int64_t cur_offset; /* current offset
3369  (incremented by each av_parser_parse()) */
3370  int64_t next_frame_offset; /* offset of the next frame */
3371  /* video info */
3372  int pict_type; /* XXX: Put it back in AVCodecContext. */
3373  /**
3374  * This field is used for proper frame duration computation in lavf.
3375  * It signals, how much longer the frame duration of the current frame
3376  * is compared to normal frame duration.
3377  *
3378  * frame_duration = (1 + repeat_pict) * time_base
3379  *
3380  * It is used by codecs like H.264 to display telecined material.
3381  */
3382  int repeat_pict; /* XXX: Put it back in AVCodecContext. */
3383  int64_t pts; /* pts of the current frame */
3384  int64_t dts; /* dts of the current frame */
3385 
3386  /* private data */
3387  int64_t last_pts;
3388  int64_t last_dts;
3390 
3391 #define AV_PARSER_PTS_NB 4
3396 
3397  int flags;
3398 #define PARSER_FLAG_COMPLETE_FRAMES 0x0001
3399 #define PARSER_FLAG_ONCE 0x0002
3400 /// Set if the parser has a valid file offset
3401 #define PARSER_FLAG_FETCHED_OFFSET 0x0004
3402 #define PARSER_FLAG_USE_CODEC_TS 0x1000
3403 
3404  int64_t offset; ///< byte offset from starting packet start
3406 
3407  /**
3408  * Set by parser to 1 for key frames and 0 for non-key frames.
3409  * It is initialized to -1, so if the parser doesn't set this flag,
3410  * old-style fallback using AV_PICTURE_TYPE_I picture type as key frames
3411  * will be used.
3412  */
3414 
3415 #if FF_API_CONVERGENCE_DURATION
3416  /**
3417  * @deprecated unused
3418  */
3421 #endif
3422 
3423  // Timestamp generation support:
3424  /**
3425  * Synchronization point for start of timestamp generation.
3426  *
3427  * Set to >0 for sync point, 0 for no sync point and <0 for undefined
3428  * (default).
3429  *
3430  * For example, this corresponds to presence of H.264 buffering period
3431  * SEI message.
3432  */
3434 
3435  /**
3436  * Offset of the current timestamp against last timestamp sync point in
3437  * units of AVCodecContext.time_base.
3438  *
3439  * Set to INT_MIN when dts_sync_point unused. Otherwise, it must
3440  * contain a valid timestamp offset.
3441  *
3442  * Note that the timestamp of sync point has usually a nonzero
3443  * dts_ref_dts_delta, which refers to the previous sync point. Offset of
3444  * the next frame after timestamp sync point will be usually 1.
3445  *
3446  * For example, this corresponds to H.264 cpb_removal_delay.
3447  */
3449 
3450  /**
3451  * Presentation delay of current frame in units of AVCodecContext.time_base.
3452  *
3453  * Set to INT_MIN when dts_sync_point unused. Otherwise, it must
3454  * contain valid non-negative timestamp delta (presentation time of a frame
3455  * must not lie in the past).
3456  *
3457  * This delay represents the difference between decoding and presentation
3458  * time of the frame.
3459  *
3460  * For example, this corresponds to H.264 dpb_output_delay.
3461  */
3463 
3464  /**
3465  * Position of the packet in file.
3466  *
3467  * Analogous to cur_frame_pts/dts
3468  */
3470 
3471  /**
3472  * Byte position of currently parsed frame in stream.
3473  */
3474  int64_t pos;
3475 
3476  /**
3477  * Previous frame byte position.
3478  */
3479  int64_t last_pos;
3480 
3481  /**
3482  * Duration of the current frame.
3483  * For audio, this is in units of 1 / AVCodecContext.sample_rate.
3484  * For all other types, this is in units of AVCodecContext.time_base.
3485  */
3487 
3489 
3490  /**
3491  * Indicate whether a picture is coded as a frame, top field or bottom field.
3492  *
3493  * For example, H.264 field_pic_flag equal to 0 corresponds to
3494  * AV_PICTURE_STRUCTURE_FRAME. An H.264 picture with field_pic_flag
3495  * equal to 1 and bottom_field_flag equal to 0 corresponds to
3496  * AV_PICTURE_STRUCTURE_TOP_FIELD.
3497  */
3499 
3500  /**
3501  * Picture number incremented in presentation or output order.
3502  * This field may be reinitialized at the first picture of a new sequence.
3503  *
3504  * For example, this corresponds to H.264 PicOrderCnt.
3505  */
3507 
3508  /**
3509  * Dimensions of the decoded video intended for presentation.
3510  */
3511  int width;
3512  int height;
3513 
3514  /**
3515  * Dimensions of the coded video.
3516  */
3519 
3520  /**
3521  * The format of the coded data, corresponds to enum AVPixelFormat for video
3522  * and for enum AVSampleFormat for audio.
3523  *
3524  * Note that a decoder can have considerable freedom in how exactly it
3525  * decodes the data, so the format reported here might be different from the
3526  * one returned by a decoder.
3527  */
3528  int format;
3530 
3531 typedef struct AVCodecParser {
3532  int codec_ids[5]; /* several codec IDs are permitted */
3535  /* This callback never returns an error, a negative value means that
3536  * the frame start was in a previous packet. */
3538  AVCodecContext *avctx,
3539  const uint8_t **poutbuf, int *poutbuf_size,
3540  const uint8_t *buf, int buf_size);
3542  int (*split)(AVCodecContext *avctx, const uint8_t *buf, int buf_size);
3544 } AVCodecParser;
3545 
3546 /**
3547  * Iterate over all registered codec parsers.
3548  *
3549  * @param opaque a pointer where libavcodec will store the iteration state. Must
3550  * point to NULL to start the iteration.
3551  *
3552  * @return the next registered codec parser or NULL when the iteration is
3553  * finished
3554  */
3555 const AVCodecParser *av_parser_iterate(void **opaque);
3556 
3559 
3563 
3564 /**
3565  * Parse a packet.
3566  *
3567  * @param s parser context.
3568  * @param avctx codec context.
3569  * @param poutbuf set to pointer to parsed buffer or NULL if not yet finished.
3570  * @param poutbuf_size set to size of parsed buffer or zero if not yet finished.
3571  * @param buf input buffer.
3572  * @param buf_size buffer size in bytes without the padding. I.e. the full buffer
3573  size is assumed to be buf_size + AV_INPUT_BUFFER_PADDING_SIZE.
3574  To signal EOF, this should be 0 (so that the last frame
3575  can be output).
3576  * @param pts input presentation timestamp.
3577  * @param dts input decoding timestamp.
3578  * @param pos input byte position in stream.
3579  * @return the number of bytes of the input bitstream used.
3580  *
3581  * Example:
3582  * @code
3583  * while(in_len){
3584  * len = av_parser_parse2(myparser, AVCodecContext, &data, &size,
3585  * in_data, in_len,
3586  * pts, dts, pos);
3587  * in_data += len;
3588  * in_len -= len;
3589  *
3590  * if(size)
3591  * decode_frame(data, size);
3592  * }
3593  * @endcode
3594  */
3596  AVCodecContext *avctx,
3597  uint8_t **poutbuf, int *poutbuf_size,
3598  const uint8_t *buf, int buf_size,
3599  int64_t pts, int64_t dts,
3600  int64_t pos);
3601 
3602 /**
3603  * @return 0 if the output buffer is a subset of the input, 1 if it is allocated and must be freed
3604  * @deprecated use AVBitStreamFilter
3605  */
3607  AVCodecContext *avctx,
3608  uint8_t **poutbuf, int *poutbuf_size,
3609  const uint8_t *buf, int buf_size, int keyframe);
3611 
3612 /**
3613  * @}
3614  * @}
3615  */
3616 
3617 /**
3618  * @addtogroup lavc_encoding
3619  * @{
3620  */
3621 
3622 /**
3623  * Encode a frame of audio.
3624  *
3625  * Takes input samples from frame and writes the next output packet, if
3626  * available, to avpkt. The output packet does not necessarily contain data for
3627  * the most recent frame, as encoders can delay, split, and combine input frames
3628  * internally as needed.
3629  *
3630  * @param avctx codec context
3631  * @param avpkt output AVPacket.
3632  * The user can supply an output buffer by setting
3633  * avpkt->data and avpkt->size prior to calling the
3634  * function, but if the size of the user-provided data is not
3635  * large enough, encoding will fail. If avpkt->data and
3636  * avpkt->size are set, avpkt->destruct must also be set. All
3637  * other AVPacket fields will be reset by the encoder using
3638  * av_init_packet(). If avpkt->data is NULL, the encoder will
3639  * allocate it. The encoder will set avpkt->size to the size
3640  * of the output packet.
3641  *
3642  * If this function fails or produces no output, avpkt will be
3643  * freed using av_packet_unref().
3644  * @param[in] frame AVFrame containing the raw audio data to be encoded.
3645  * May be NULL when flushing an encoder that has the
3646  * AV_CODEC_CAP_DELAY capability set.
3647  * If AV_CODEC_CAP_VARIABLE_FRAME_SIZE is set, then each frame
3648  * can have any number of samples.
3649  * If it is not set, frame->nb_samples must be equal to
3650  * avctx->frame_size for all frames except the last.
3651  * The final frame may be smaller than avctx->frame_size.
3652  * @param[out] got_packet_ptr This field is set to 1 by libavcodec if the
3653  * output packet is non-empty, and to 0 if it is
3654  * empty. If the function returns an error, the
3655  * packet can be assumed to be invalid, and the
3656  * value of got_packet_ptr is undefined and should
3657  * not be used.
3658  * @return 0 on success, negative error code on failure
3659  *
3660  * @deprecated use avcodec_send_frame()/avcodec_receive_packet() instead
3661  */
3664  const AVFrame *frame, int *got_packet_ptr);
3665 
3666 /**
3667  * Encode a frame of video.
3668  *
3669  * Takes input raw video data from frame and writes the next output packet, if
3670  * available, to avpkt. The output packet does not necessarily contain data for
3671  * the most recent frame, as encoders can delay and reorder input frames
3672  * internally as needed.
3673  *
3674  * @param avctx codec context
3675  * @param avpkt output AVPacket.
3676  * The user can supply an output buffer by setting
3677  * avpkt->data and avpkt->size prior to calling the
3678  * function, but if the size of the user-provided data is not
3679  * large enough, encoding will fail. All other AVPacket fields
3680  * will be reset by the encoder using av_init_packet(). If
3681  * avpkt->data is NULL, the encoder will allocate it.
3682  * The encoder will set avpkt->size to the size of the
3683  * output packet. The returned data (if any) belongs to the
3684  * caller, he is responsible for freeing it.
3685  *
3686  * If this function fails or produces no output, avpkt will be
3687  * freed using av_packet_unref().
3688  * @param[in] frame AVFrame containing the raw video data to be encoded.
3689  * May be NULL when flushing an encoder that has the
3690  * AV_CODEC_CAP_DELAY capability set.
3691  * @param[out] got_packet_ptr This field is set to 1 by libavcodec if the
3692  * output packet is non-empty, and to 0 if it is
3693  * empty. If the function returns an error, the
3694  * packet can be assumed to be invalid, and the
3695  * value of got_packet_ptr is undefined and should
3696  * not be used.
3697  * @return 0 on success, negative error code on failure
3698  *
3699  * @deprecated use avcodec_send_frame()/avcodec_receive_packet() instead
3700  */
3703  const AVFrame *frame, int *got_packet_ptr);
3704 
3705 int avcodec_encode_subtitle(AVCodecContext *avctx, uint8_t *buf, int buf_size,
3706  const AVSubtitle *sub);
3707 
3708 
3709 /**
3710  * @}
3711  */
3712 
3713 #if FF_API_AVPICTURE
3714 /**
3715  * @addtogroup lavc_picture
3716  * @{
3717  */
3718 
3719 /**
3720  * @deprecated unused
3721  */
3724 
3725 /**
3726  * @deprecated unused
3727  */
3729 void avpicture_free(AVPicture *picture);
3730 
3731 /**
3732  * @deprecated use av_image_fill_arrays() instead.
3733  */
3735 int avpicture_fill(AVPicture *picture, const uint8_t *ptr,
3736  enum AVPixelFormat pix_fmt, int width, int height);
3737 
3738 /**
3739  * @deprecated use av_image_copy_to_buffer() instead.
3740  */
3743  int width, int height,
3744  unsigned char *dest, int dest_size);
3745 
3746 /**
3747  * @deprecated use av_image_get_buffer_size() instead.
3748  */
3751 
3752 /**
3753  * @deprecated av_image_copy() instead.
3754  */
3756 void av_picture_copy(AVPicture *dst, const AVPicture *src,
3757  enum AVPixelFormat pix_fmt, int width, int height);
3758 
3759 /**
3760  * @deprecated unused
3761  */
3763 int av_picture_crop(AVPicture *dst, const AVPicture *src,
3764  enum AVPixelFormat pix_fmt, int top_band, int left_band);
3765 
3766 /**
3767  * @deprecated unused
3768  */
3770 int av_picture_pad(AVPicture *dst, const AVPicture *src, int height, int width, enum AVPixelFormat pix_fmt,
3771  int padtop, int padbottom, int padleft, int padright, int *color);
3772 
3773 /**
3774  * @}
3775  */
3776 #endif
3777 
3778 /**
3779  * @defgroup lavc_misc Utility functions
3780  * @ingroup libavc
3781  *
3782  * Miscellaneous utility functions related to both encoding and decoding
3783  * (or neither).
3784  * @{
3785  */
3786 
3787 /**
3788  * @defgroup lavc_misc_pixfmt Pixel formats
3789  *
3790  * Functions for working with pixel formats.
3791  * @{
3792  */
3793 
3794 #if FF_API_GETCHROMA
3795 /**
3796  * @deprecated Use av_pix_fmt_get_chroma_sub_sample
3797  */
3798 
3800 void avcodec_get_chroma_sub_sample(enum AVPixelFormat pix_fmt, int *h_shift, int *v_shift);
3801 #endif
3802 
3803 /**
3804  * Return a value representing the fourCC code associated to the
3805  * pixel format pix_fmt, or 0 if no associated fourCC code can be
3806  * found.
3807  */
3809 
3810 /**
3811  * @deprecated see av_get_pix_fmt_loss()
3812  */
3813 int avcodec_get_pix_fmt_loss(enum AVPixelFormat dst_pix_fmt, enum AVPixelFormat src_pix_fmt,
3814  int has_alpha);
3815 
3816 /**
3817  * Find the best pixel format to convert to given a certain source pixel
3818  * format. When converting from one pixel format to another, information loss
3819  * may occur. For example, when converting from RGB24 to GRAY, the color
3820  * information will be lost. Similarly, other losses occur when converting from
3821  * some formats to other formats. avcodec_find_best_pix_fmt_of_2() searches which of
3822  * the given pixel formats should be used to suffer the least amount of loss.
3823  * The pixel formats from which it chooses one, are determined by the
3824  * pix_fmt_list parameter.
3825  *
3826  *
3827  * @param[in] pix_fmt_list AV_PIX_FMT_NONE terminated array of pixel formats to choose from
3828  * @param[in] src_pix_fmt source pixel format
3829  * @param[in] has_alpha Whether the source pixel format alpha channel is used.
3830  * @param[out] loss_ptr Combination of flags informing you what kind of losses will occur.
3831  * @return The best pixel format to convert to or -1 if none was found.
3832  */
3833 enum AVPixelFormat avcodec_find_best_pix_fmt_of_list(const enum AVPixelFormat *pix_fmt_list,
3834  enum AVPixelFormat src_pix_fmt,
3835  int has_alpha, int *loss_ptr);
3836 
3837 /**
3838  * @deprecated see av_find_best_pix_fmt_of_2()
3839  */
3840 enum AVPixelFormat avcodec_find_best_pix_fmt_of_2(enum AVPixelFormat dst_pix_fmt1, enum AVPixelFormat dst_pix_fmt2,
3841  enum AVPixelFormat src_pix_fmt, int has_alpha, int *loss_ptr);
3842 
3844 enum AVPixelFormat avcodec_find_best_pix_fmt2(enum AVPixelFormat dst_pix_fmt1, enum AVPixelFormat dst_pix_fmt2,
3845  enum AVPixelFormat src_pix_fmt, int has_alpha, int *loss_ptr);
3846 
3847 enum AVPixelFormat avcodec_default_get_format(struct AVCodecContext *s, const enum AVPixelFormat * fmt);
3848 
3849 /**
3850  * @}
3851  */
3852 
3853 #if FF_API_TAG_STRING
3854 /**
3855  * Put a string representing the codec tag codec_tag in buf.
3856  *
3857  * @param buf buffer to place codec tag in
3858  * @param buf_size size in bytes of buf
3859  * @param codec_tag codec tag to assign
3860  * @return the length of the string that would have been generated if
3861  * enough space had been available, excluding the trailing null
3862  *
3863  * @deprecated see av_fourcc_make_string() and av_fourcc2str().
3864  */
3866 size_t av_get_codec_tag_string(char *buf, size_t buf_size, unsigned int codec_tag);
3867 #endif
3868 
3869 void avcodec_string(char *buf, int buf_size, AVCodecContext *enc, int encode);
3870 
3871 /**
3872  * Return a name for the specified profile, if available.
3873  *
3874  * @param codec the codec that is searched for the given profile
3875  * @param profile the profile value for which a name is requested
3876  * @return A name for the profile if found, NULL otherwise.
3877  */
3878 const char *av_get_profile_name(const AVCodec *codec, int profile);
3879 
3880 /**
3881  * Return a name for the specified profile, if available.
3882  *
3883  * @param codec_id the ID of the codec to which the requested profile belongs
3884  * @param profile the profile value for which a name is requested
3885  * @return A name for the profile if found, NULL otherwise.
3886  *
3887  * @note unlike av_get_profile_name(), which searches a list of profiles
3888  * supported by a specific decoder or encoder implementation, this
3889  * function searches the list of profiles from the AVCodecDescriptor
3890  */
3891 const char *avcodec_profile_name(enum AVCodecID codec_id, int profile);
3892 
3893 int avcodec_default_execute(AVCodecContext *c, int (*func)(AVCodecContext *c2, void *arg2),void *arg, int *ret, int count, int size);
3894 int avcodec_default_execute2(AVCodecContext *c, int (*func)(AVCodecContext *c2, void *arg2, int, int),void *arg, int *ret, int count);
3895 //FIXME func typedef
3896 
3897 /**
3898  * Fill AVFrame audio data and linesize pointers.
3899  *
3900  * The buffer buf must be a preallocated buffer with a size big enough
3901  * to contain the specified samples amount. The filled AVFrame data
3902  * pointers will point to this buffer.
3903  *
3904  * AVFrame extended_data channel pointers are allocated if necessary for
3905  * planar audio.
3906  *
3907  * @param frame the AVFrame
3908  * frame->nb_samples must be set prior to calling the
3909  * function. This function fills in frame->data,
3910  * frame->extended_data, frame->linesize[0].
3911  * @param nb_channels channel count
3912  * @param sample_fmt sample format
3913  * @param buf buffer to use for frame data
3914  * @param buf_size size of buffer
3915  * @param align plane size sample alignment (0 = default)
3916  * @return >=0 on success, negative error code on failure
3917  * @todo return the size in bytes required to store the samples in
3918  * case of success, at the next libavutil bump
3919  */
3921  enum AVSampleFormat sample_fmt, const uint8_t *buf,
3922  int buf_size, int align);
3923 
3924 /**
3925  * Reset the internal codec state / flush internal buffers. Should be called
3926  * e.g. when seeking or when switching to a different stream.
3927  *
3928  * @note for decoders, when refcounted frames are not used
3929  * (i.e. avctx->refcounted_frames is 0), this invalidates the frames previously
3930  * returned from the decoder. When refcounted frames are used, the decoder just
3931  * releases any references it might keep internally, but the caller's reference
3932  * remains valid.
3933  *
3934  * @note for encoders, this function will only do something if the encoder
3935  * declares support for AV_CODEC_CAP_ENCODER_FLUSH. When called, the encoder
3936  * will drain any remaining packets, and can then be re-used for a different
3937  * stream (as opposed to sending a null frame which will leave the encoder
3938  * in a permanent EOF state after draining). This can be desirable if the
3939  * cost of tearing down and replacing the encoder instance is high.
3940  */
3942 
3943 /**
3944  * Return codec bits per sample.
3945  *
3946  * @param[in] codec_id the codec
3947  * @return Number of bits per sample or zero if unknown for the given codec.
3948  */
3950 
3951 /**
3952  * Return the PCM codec associated with a sample format.
3953  * @param be endianness, 0 for little, 1 for big,
3954  * -1 (or anything else) for native
3955  * @return AV_CODEC_ID_PCM_* or AV_CODEC_ID_NONE
3956  */
3957 enum AVCodecID av_get_pcm_codec(enum AVSampleFormat fmt, int be);
3958 
3959 /**
3960  * Return codec bits per sample.
3961  * Only return non-zero if the bits per sample is exactly correct, not an
3962  * approximation.
3963  *
3964  * @param[in] codec_id the codec
3965  * @return Number of bits per sample or zero if unknown for the given codec.
3966  */
3968 
3969 /**
3970  * Return audio frame duration.
3971  *
3972  * @param avctx codec context
3973  * @param frame_bytes size of the frame, or 0 if unknown
3974  * @return frame duration, in samples, if known. 0 if not able to
3975  * determine.
3976  */
3977 int av_get_audio_frame_duration(AVCodecContext *avctx, int frame_bytes);
3978 
3979 /**
3980  * This function is the same as av_get_audio_frame_duration(), except it works
3981  * with AVCodecParameters instead of an AVCodecContext.
3982  */
3984 
3985 #if FF_API_OLD_BSF
3987  void *priv_data;
3988  const struct AVBitStreamFilter *filter;
3991  /**
3992  * Internal default arguments, used if NULL is passed to av_bitstream_filter_filter().
3993  * Not for access by library users.
3994  */
3995  char *args;
3997 
3998 /**
3999  * @deprecated the old bitstream filtering API (using AVBitStreamFilterContext)
4000  * is deprecated. Use the new bitstream filtering API (using AVBSFContext).
4001  */
4004 /**
4005  * @deprecated the old bitstream filtering API (using AVBitStreamFilterContext)
4006  * is deprecated. Use av_bsf_get_by_name(), av_bsf_alloc(), and av_bsf_init()
4007  * from the new bitstream filtering API (using AVBSFContext).
4008  */
4011 /**
4012  * @deprecated the old bitstream filtering API (using AVBitStreamFilterContext)
4013  * is deprecated. Use av_bsf_send_packet() and av_bsf_receive_packet() from the
4014  * new bitstream filtering API (using AVBSFContext).
4015  */
4018  AVCodecContext *avctx, const char *args,
4019  uint8_t **poutbuf, int *poutbuf_size,
4020  const uint8_t *buf, int buf_size, int keyframe);
4021 /**
4022  * @deprecated the old bitstream filtering API (using AVBitStreamFilterContext)
4023  * is deprecated. Use av_bsf_free() from the new bitstream filtering API (using
4024  * AVBSFContext).
4025  */
4028 /**
4029  * @deprecated the old bitstream filtering API (using AVBitStreamFilterContext)
4030  * is deprecated. Use av_bsf_iterate() from the new bitstream filtering API (using
4031  * AVBSFContext).
4032  */
4035 #endif
4036 
4037 #if FF_API_NEXT
4039 const AVBitStreamFilter *av_bsf_next(void **opaque);
4040 #endif
4041 
4042 /* memory */
4043 
4044 /**
4045  * Same behaviour av_fast_malloc but the buffer has additional
4046  * AV_INPUT_BUFFER_PADDING_SIZE at the end which will always be 0.
4047  *
4048  * In addition the whole buffer will initially and after resizes
4049  * be 0-initialized so that no uninitialized data will ever appear.
4050  */
4051 void av_fast_padded_malloc(void *ptr, unsigned int *size, size_t min_size);
4052 
4053 /**
4054  * Same behaviour av_fast_padded_malloc except that buffer will always
4055  * be 0-initialized after call.
4056  */
4057 void av_fast_padded_mallocz(void *ptr, unsigned int *size, size_t min_size);
4058 
4059 /**
4060  * Encode extradata length to a buffer. Used by xiph codecs.
4061  *
4062  * @param s buffer to write to; must be at least (v/255+1) bytes long
4063  * @param v size of extradata in bytes
4064  * @return number of bytes written to the buffer.
4065  */
4066 unsigned int av_xiphlacing(unsigned char *s, unsigned int v);
4067 
4068 #if FF_API_USER_VISIBLE_AVHWACCEL
4069 /**
4070  * Register the hardware accelerator hwaccel.
4071  *
4072  * @deprecated This function doesn't do anything.
4073  */
4076 
4077 /**
4078  * If hwaccel is NULL, returns the first registered hardware accelerator,
4079  * if hwaccel is non-NULL, returns the next registered hardware accelerator
4080  * after hwaccel, or NULL if hwaccel is the last one.
4081  *
4082  * @deprecated AVHWaccel structures contain no user-serviceable parts, so
4083  * this function should not be used.
4084  */
4087 #endif
4088 
4089 #if FF_API_LOCKMGR
4090 /**
4091  * Lock operation used by lockmgr
4092  *
4093  * @deprecated Deprecated together with av_lockmgr_register().
4094  */
4095 enum AVLockOp {
4096  AV_LOCK_CREATE, ///< Create a mutex
4097  AV_LOCK_OBTAIN, ///< Lock the mutex
4098  AV_LOCK_RELEASE, ///< Unlock the mutex
4099  AV_LOCK_DESTROY, ///< Free mutex resources
4100 };
4101 
4102 /**
4103  * Register a user provided lock manager supporting the operations
4104  * specified by AVLockOp. The "mutex" argument to the function points
4105  * to a (void *) where the lockmgr should store/get a pointer to a user
4106  * allocated mutex. It is NULL upon AV_LOCK_CREATE and equal to the
4107  * value left by the last call for all other ops. If the lock manager is
4108  * unable to perform the op then it should leave the mutex in the same
4109  * state as when it was called and return a non-zero value. However,
4110  * when called with AV_LOCK_DESTROY the mutex will always be assumed to
4111  * have been successfully destroyed. If av_lockmgr_register succeeds
4112  * it will return a non-negative value, if it fails it will return a
4113  * negative value and destroy all mutex and unregister all callbacks.
4114  * av_lockmgr_register is not thread-safe, it must be called from a
4115  * single thread before any calls which make use of locking are used.
4116  *
4117  * @param cb User defined callback. av_lockmgr_register invokes calls
4118  * to this callback and the previously registered callback.
4119  * The callback will be used to create more than one mutex
4120  * each of which must be backed by its own underlying locking
4121  * mechanism (i.e. do not use a single static object to
4122  * implement your lock manager). If cb is set to NULL the
4123  * lockmgr will be unregistered.
4124  *
4125  * @deprecated This function does nothing, and always returns 0. Be sure to
4126  * build with thread support to get basic thread safety.
4127  */
4129 int av_lockmgr_register(int (*cb)(void **mutex, enum AVLockOp op));
4130 #endif
4131 
4132 /**
4133  * @return a positive value if s is open (i.e. avcodec_open2() was called on it
4134  * with no corresponding avcodec_close()), 0 otherwise.
4135  */
4137 
4138 /**
4139  * Allocate a CPB properties structure and initialize its fields to default
4140  * values.
4141  *
4142  * @param size if non-NULL, the size of the allocated struct will be written
4143  * here. This is useful for embedding it in side data.
4144  *
4145  * @return the newly allocated struct or NULL on failure
4146  */
4148 
4149 /**
4150  * @}
4151  */
4152 
4153 #endif /* AVCODEC_AVCODEC_H */
Macro definitions for various function/variable attributes.
#define attribute_deprecated
Definition: attributes.h:100
#define AV_PARSER_PTS_NB
Definition: avcodec.h:3391
Convenience header that includes libavutil's core.
refcounted data buffer API
audio channel layout utility functions
AVFieldOrder
Definition: codec_par.h:36
static int width
static enum AVPixelFormat pix_fmt
static int height
static AVFrame * frame
Public dictionary API.
static void encode(AVCodecContext *ctx, AVFrame *frame, AVPacket *pkt, FILE *output)
Definition: encode_audio.c:95
reference-counted frame API
#define AV_NUM_DATA_POINTERS
Definition: frame.h:301
int avcodec_parameters_from_context(AVCodecParameters *par, const AVCodecContext *codec)
Fill the parameters struct based on the values from the supplied codec context.
int avcodec_open2(AVCodecContext *avctx, const AVCodec *codec, AVDictionary **options)
Initialize the AVCodecContext to use the given AVCodec.
attribute_deprecated void av_codec_set_pkt_timebase(AVCodecContext *avctx, AVRational val)
int avcodec_get_context_defaults3(AVCodecContext *s, const AVCodec *codec)
attribute_deprecated AVRational av_codec_get_pkt_timebase(const AVCodecContext *avctx)
Accessors for some AVCodecContext fields.
attribute_deprecated AVCodec * av_codec_next(const AVCodec *c)
If c is NULL, returns the first registered codec, if c is non-NULL, returns the next registered codec...
const AVClass * avcodec_get_subtitle_rect_class(void)
Get the AVClass for AVSubtitleRect.
attribute_deprecated const AVCodecDescriptor * av_codec_get_codec_descriptor(const AVCodecContext *avctx)
attribute_deprecated void av_codec_set_codec_descriptor(AVCodecContext *avctx, const AVCodecDescriptor *desc)
attribute_deprecated void avcodec_register(AVCodec *codec)
Register the codec codec and initialize libavcodec.
attribute_deprecated void av_codec_set_chroma_intra_matrix(AVCodecContext *avctx, uint16_t *val)
AVSubtitleType
Definition: avcodec.h:2650
attribute_deprecated int av_codec_get_lowres(const AVCodecContext *avctx)
attribute_deprecated uint16_t * av_codec_get_chroma_intra_matrix(const AVCodecContext *avctx)
void avsubtitle_free(AVSubtitle *sub)
Free all allocated data in the given subtitle struct.
attribute_deprecated void av_codec_set_lowres(AVCodecContext *avctx, int val)
AVCodecID
Identify the syntax and semantics of the bitstream.
Definition: codec_id.h:46
const char * avcodec_configuration(void)
Return the libavcodec build-time configuration.
attribute_deprecated unsigned av_codec_get_codec_properties(const AVCodecContext *avctx)
int avcodec_parameters_to_context(AVCodecContext *codec, const AVCodecParameters *par)
Fill the codec context based on the values from the supplied codec parameters.
attribute_deprecated int av_codec_get_seek_preroll(const AVCodecContext *avctx)
attribute_deprecated void av_codec_set_seek_preroll(AVCodecContext *avctx, int val)
const AVClass * avcodec_get_frame_class(void)
Get the AVClass for AVFrame.
AVAudioServiceType
Definition: avcodec.h:239
unsigned avcodec_version(void)
Return the LIBAVCODEC_VERSION_INT constant.
attribute_deprecated int avcodec_copy_context(AVCodecContext *dest, const AVCodecContext *src)
Copy the settings of the source AVCodecContext into the destination AVCodecContext.
const char * avcodec_license(void)
Return the libavcodec license.
AVCodecContext * avcodec_alloc_context3(const AVCodec *codec)
Allocate an AVCodecContext and set its fields to default values.
const AVClass * avcodec_get_class(void)
Get the AVClass for AVCodecContext.
attribute_deprecated int av_codec_get_max_lowres(const AVCodec *codec)
attribute_deprecated void avcodec_register_all(void)
Register all the codecs, parsers and bitstream filters which were enabled at configuration time.
int avcodec_close(AVCodecContext *avctx)
Close a given AVCodecContext and free all the data associated with it (but not the AVCodecContext its...
void avcodec_free_context(AVCodecContext **avctx)
Free the codec context and everything associated with it and write NULL to the provided pointer.
@ SUBTITLE_BITMAP
A bitmap, pict will be set.
Definition: avcodec.h:2653
@ SUBTITLE_ASS
Formatted text, the ass field must be set by the decoder and is authoritative.
Definition: avcodec.h:2665
@ SUBTITLE_TEXT
Plain text, the text field must be set by the decoder and is authoritative.
Definition: avcodec.h:2659
@ SUBTITLE_NONE
Definition: avcodec.h:2651
@ AV_AUDIO_SERVICE_TYPE_VOICE_OVER
Definition: avcodec.h:247
@ AV_AUDIO_SERVICE_TYPE_EMERGENCY
Definition: avcodec.h:246
@ AV_AUDIO_SERVICE_TYPE_EFFECTS
Definition: avcodec.h:241
@ AV_AUDIO_SERVICE_TYPE_MAIN
Definition: avcodec.h:240
@ AV_AUDIO_SERVICE_TYPE_DIALOGUE
Definition: avcodec.h:244
@ AV_AUDIO_SERVICE_TYPE_KARAOKE
Definition: avcodec.h:248
@ AV_AUDIO_SERVICE_TYPE_HEARING_IMPAIRED
Definition: avcodec.h:243
@ AV_AUDIO_SERVICE_TYPE_COMMENTARY
Definition: avcodec.h:245
@ AV_AUDIO_SERVICE_TYPE_NB
Not part of ABI.
Definition: avcodec.h:249
@ AV_AUDIO_SERVICE_TYPE_VISUALLY_IMPAIRED
Definition: avcodec.h:242
int avcodec_default_get_buffer2(AVCodecContext *s, AVFrame *frame, int flags)
The default callback for AVCodecContext.get_buffer2().
int avcodec_receive_frame(AVCodecContext *avctx, AVFrame *frame)
Return decoded output data from a decoder.
int avcodec_enum_to_chroma_pos(int *xpos, int *ypos, enum AVChromaLocation pos)
Converts AVChromaLocation to swscale x/y chroma position.
enum AVChromaLocation avcodec_chroma_pos_to_enum(int xpos, int ypos)
Converts swscale x/y chroma position to AVChromaLocation.
void avcodec_align_dimensions2(AVCodecContext *s, int *width, int *height, int linesize_align[AV_NUM_DATA_POINTERS])
Modify width and height values so that they will result in a memory buffer that is acceptable for the...
AVDiscard
Definition: avcodec.h:227
attribute_deprecated int avcodec_decode_video2(AVCodecContext *avctx, AVFrame *picture, int *got_picture_ptr, const AVPacket *avpkt)
Decode the video frame of size avpkt->size from avpkt->data into picture.
int avcodec_decode_subtitle2(AVCodecContext *avctx, AVSubtitle *sub, int *got_sub_ptr, AVPacket *avpkt)
Decode a subtitle message.
void avcodec_align_dimensions(AVCodecContext *s, int *width, int *height)
Modify width and height values so that they will result in a memory buffer that is acceptable for the...
int avcodec_send_packet(AVCodecContext *avctx, const AVPacket *avpkt)
Supply raw packet data as input to a decoder.
int avcodec_receive_packet(AVCodecContext *avctx, AVPacket *avpkt)
Read encoded data from the encoder.
int avcodec_get_hw_frames_parameters(AVCodecContext *avctx, AVBufferRef *device_ref, enum AVPixelFormat hw_pix_fmt, AVBufferRef **out_frames_ref)
Create and return a AVHWFramesContext with values adequate for hardware decoding.
int avcodec_send_frame(AVCodecContext *avctx, const AVFrame *frame)
Supply a raw video or audio frame to the encoder.
attribute_deprecated int avcodec_decode_audio4(AVCodecContext *avctx, AVFrame *frame, int *got_frame_ptr, const AVPacket *avpkt)
Decode the audio frame of size avpkt->size from avpkt->data into frame.
@ AVDISCARD_ALL
discard all
Definition: avcodec.h:236
@ AVDISCARD_NONKEY
discard all frames except keyframes
Definition: avcodec.h:235
@ AVDISCARD_BIDIR
discard all bidirectional frames
Definition: avcodec.h:233
@ AVDISCARD_DEFAULT
discard useless packets like 0 size packets in avi
Definition: avcodec.h:231
@ AVDISCARD_NONE
discard nothing
Definition: avcodec.h:230
@ AVDISCARD_NONINTRA
discard all non intra frames
Definition: avcodec.h:234
@ AVDISCARD_NONREF
discard all non reference
Definition: avcodec.h:232
attribute_deprecated int avcodec_encode_video2(AVCodecContext *avctx, AVPacket *avpkt, const AVFrame *frame, int *got_packet_ptr)
Encode a frame of video.
int avcodec_encode_subtitle(AVCodecContext *avctx, uint8_t *buf, int buf_size, const AVSubtitle *sub)
attribute_deprecated int avcodec_encode_audio2(AVCodecContext *avctx, AVPacket *avpkt, const AVFrame *frame, int *got_packet_ptr)
Encode a frame of audio.
attribute_deprecated void avcodec_get_chroma_sub_sample(enum AVPixelFormat pix_fmt, int *h_shift, int *v_shift)
enum AVPixelFormat avcodec_find_best_pix_fmt_of_2(enum AVPixelFormat dst_pix_fmt1, enum AVPixelFormat dst_pix_fmt2, enum AVPixelFormat src_pix_fmt, int has_alpha, int *loss_ptr)
enum AVPixelFormat avcodec_default_get_format(struct AVCodecContext *s, const enum AVPixelFormat *fmt)
int avcodec_get_pix_fmt_loss(enum AVPixelFormat dst_pix_fmt, enum AVPixelFormat src_pix_fmt, int has_alpha)
unsigned int avcodec_pix_fmt_to_codec_tag(enum AVPixelFormat pix_fmt)
Return a value representing the fourCC code associated to the pixel format pix_fmt,...
enum AVPixelFormat avcodec_find_best_pix_fmt_of_list(const enum AVPixelFormat *pix_fmt_list, enum AVPixelFormat src_pix_fmt, int has_alpha, int *loss_ptr)
Find the best pixel format to convert to given a certain source pixel format.
attribute_deprecated enum AVPixelFormat avcodec_find_best_pix_fmt2(enum AVPixelFormat dst_pix_fmt1, enum AVPixelFormat dst_pix_fmt2, enum AVPixelFormat src_pix_fmt, int has_alpha, int *loss_ptr)
attribute_deprecated AVHWAccel * av_hwaccel_next(const AVHWAccel *hwaccel)
If hwaccel is NULL, returns the first registered hardware accelerator, if hwaccel is non-NULL,...
void av_fast_padded_malloc(void *ptr, unsigned int *size, size_t min_size)
Same behaviour av_fast_malloc but the buffer has additional AV_INPUT_BUFFER_PADDING_SIZE at the end w...
int av_get_bits_per_sample(enum AVCodecID codec_id)
Return codec bits per sample.
const char * av_get_profile_name(const AVCodec *codec, int profile)
Return a name for the specified profile, if available.
unsigned int av_xiphlacing(unsigned char *s, unsigned int v)
Encode extradata length to a buffer.
int av_get_audio_frame_duration2(AVCodecParameters *par, int frame_bytes)
This function is the same as av_get_audio_frame_duration(), except it works with AVCodecParameters in...
attribute_deprecated void av_bitstream_filter_close(AVBitStreamFilterContext *bsf)
int av_get_audio_frame_duration(AVCodecContext *avctx, int frame_bytes)
Return audio frame duration.
int avcodec_default_execute2(AVCodecContext *c, int(*func)(AVCodecContext *c2, void *arg2, int, int), void *arg, int *ret, int count)
attribute_deprecated int av_lockmgr_register(int(*cb)(void **mutex, enum AVLockOp op))
Register a user provided lock manager supporting the operations specified by AVLockOp.
attribute_deprecated AVBitStreamFilterContext * av_bitstream_filter_init(const char *name)
int avcodec_fill_audio_frame(AVFrame *frame, int nb_channels, enum AVSampleFormat sample_fmt, const uint8_t *buf, int buf_size, int align)
Fill AVFrame audio data and linesize pointers.
void avcodec_string(char *buf, int buf_size, AVCodecContext *enc, int encode)
attribute_deprecated void av_register_bitstream_filter(AVBitStreamFilter *bsf)
attribute_deprecated void av_register_hwaccel(AVHWAccel *hwaccel)
Register the hardware accelerator hwaccel.
AVLockOp
Lock operation used by lockmgr.
Definition: avcodec.h:4095
const char * avcodec_profile_name(enum AVCodecID codec_id, int profile)
Return a name for the specified profile, if available.
AVCPBProperties * av_cpb_properties_alloc(size_t *size)
Allocate a CPB properties structure and initialize its fields to default values.
attribute_deprecated int av_bitstream_filter_filter(AVBitStreamFilterContext *bsfc, AVCodecContext *avctx, const char *args, uint8_t **poutbuf, int *poutbuf_size, const uint8_t *buf, int buf_size, int keyframe)
int avcodec_is_open(AVCodecContext *s)
int avcodec_default_execute(AVCodecContext *c, int(*func)(AVCodecContext *c2, void *arg2), void *arg, int *ret, int count, int size)
attribute_deprecated const AVBitStreamFilter * av_bitstream_filter_next(const AVBitStreamFilter *f)
int av_get_exact_bits_per_sample(enum AVCodecID codec_id)
Return codec bits per sample.
attribute_deprecated const AVBitStreamFilter * av_bsf_next(void **opaque)
void av_fast_padded_mallocz(void *ptr, unsigned int *size, size_t min_size)
Same behaviour av_fast_padded_malloc except that buffer will always be 0-initialized after call.
void avcodec_flush_buffers(AVCodecContext *avctx)
Reset the internal codec state / flush internal buffers.
attribute_deprecated size_t av_get_codec_tag_string(char *buf, size_t buf_size, unsigned int codec_tag)
Put a string representing the codec tag codec_tag in buf.
enum AVCodecID av_get_pcm_codec(enum AVSampleFormat fmt, int be)
Return the PCM codec associated with a sample format.
@ AV_LOCK_CREATE
Create a mutex.
Definition: avcodec.h:4096
@ AV_LOCK_RELEASE
Unlock the mutex.
Definition: avcodec.h:4098
@ AV_LOCK_DESTROY
Free mutex resources.
Definition: avcodec.h:4099
@ AV_LOCK_OBTAIN
Lock the mutex.
Definition: avcodec.h:4097
attribute_deprecated void av_register_codec_parser(AVCodecParser *parser)
AVCodecParserContext * av_parser_init(int codec_id)
void av_parser_close(AVCodecParserContext *s)
int av_parser_change(AVCodecParserContext *s, AVCodecContext *avctx, uint8_t **poutbuf, int *poutbuf_size, const uint8_t *buf, int buf_size, int keyframe)
int av_parser_parse2(AVCodecParserContext *s, AVCodecContext *avctx, uint8_t **poutbuf, int *poutbuf_size, const uint8_t *buf, int buf_size, int64_t pts, int64_t dts, int64_t pos)
Parse a packet.
const AVCodecParser * av_parser_iterate(void **opaque)
Iterate over all registered codec parsers.
AVPictureStructure
Definition: avcodec.h:3357
attribute_deprecated AVCodecParser * av_parser_next(const AVCodecParser *c)
@ AV_PICTURE_STRUCTURE_FRAME
Definition: avcodec.h:3361
@ AV_PICTURE_STRUCTURE_BOTTOM_FIELD
Definition: avcodec.h:3360
@ AV_PICTURE_STRUCTURE_TOP_FIELD
Definition: avcodec.h:3359
@ AV_PICTURE_STRUCTURE_UNKNOWN
Definition: avcodec.h:3358
attribute_deprecated void av_picture_copy(AVPicture *dst, const AVPicture *src, enum AVPixelFormat pix_fmt, int width, int height)
attribute_deprecated void avpicture_free(AVPicture *picture)
attribute_deprecated int avpicture_layout(const AVPicture *src, enum AVPixelFormat pix_fmt, int width, int height, unsigned char *dest, int dest_size)
attribute_deprecated int av_picture_pad(AVPicture *dst, const AVPicture *src, int height, int width, enum AVPixelFormat pix_fmt, int padtop, int padbottom, int padleft, int padright, int *color)
attribute_deprecated int avpicture_fill(AVPicture *picture, const uint8_t *ptr, enum AVPixelFormat pix_fmt, int width, int height)
attribute_deprecated int avpicture_alloc(AVPicture *picture, enum AVPixelFormat pix_fmt, int width, int height)
attribute_deprecated int avpicture_get_size(enum AVPixelFormat pix_fmt, int width, int height)
attribute_deprecated int av_picture_crop(AVPicture *dst, const AVPicture *src, enum AVPixelFormat pix_fmt, int top_band, int left_band)
struct AVDictionary AVDictionary
Definition: dict.h:86
AVMediaType
Definition: avutil.h:199
AVSampleFormat
Audio sample formats.
Definition: samplefmt.h:58
static enum AVPixelFormat hw_pix_fmt
Definition: hw_decode.c:46
Libavutil version macros.
pixel format definitions
AVChromaLocation
Location of chroma samples.
Definition: pixfmt.h:560
AVColorRange
MPEG vs JPEG YUV range.
Definition: pixfmt.h:538
AVPixelFormat
Pixel format.
Definition: pixfmt.h:64
AVColorPrimaries
Chromaticity coordinates of the source primaries.
Definition: pixfmt.h:461
AVColorTransferCharacteristic
Color Transfer Characteristic.
Definition: pixfmt.h:486
AVColorSpace
YUV colorspace type.
Definition: pixfmt.h:515
Utilties for rational number calculation.
const struct AVBitStreamFilter * filter
Definition: avcodec.h:3988
char * args
Internal default arguments, used if NULL is passed to av_bitstream_filter_filter().
Definition: avcodec.h:3995
struct AVBitStreamFilterContext * next
Definition: avcodec.h:3990
AVCodecParserContext * parser
Definition: avcodec.h:3989
A reference to a data buffer.
Definition: buffer.h:81
This structure describes the bitrate properties of an encoded bitstream.
Definition: avcodec.h:448
int avg_bitrate
Average bitrate of the stream, in bits per second.
Definition: avcodec.h:472
uint64_t vbv_delay
The delay between the time the packet this structure is associated with is received and the time when...
Definition: avcodec.h:490
int min_bitrate
Minimum bitrate of the stream, in bits per second.
Definition: avcodec.h:463
int buffer_size
The size of the buffer to which the ratecontrol is applied, in bits.
Definition: avcodec.h:481
int max_bitrate
Maximum bitrate of the stream, in bits per second.
Definition: avcodec.h:454
Describe the class of an AVClass context structure.
Definition: log.h:67
main external API structure.
Definition: avcodec.h:526
attribute_deprecated int brd_scale
Definition: avcodec.h:1099
int nsse_weight
noise vs.
Definition: avcodec.h:1852
float rc_max_available_vbv_use
Ratecontrol attempt to use, at maximum, of what can be used without an underflow.
Definition: avcodec.h:1418
int skip_top
Number of macroblock rows at the top which are skipped.
Definition: avcodec.h:1059
int trellis
trellis RD quantization
Definition: avcodec.h:1475
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
Definition: avcodec.h:736
attribute_deprecated int pre_me
Definition: avcodec.h:966
int64_t pts_correction_last_dts
PTS of the last frame.
Definition: avcodec.h:2109
int max_qdiff
maximum quantizer difference between frames
Definition: avcodec.h:1382
uint16_t * chroma_intra_matrix
custom intra quantization matrix
Definition: avcodec.h:2168
const AVCodecDescriptor * codec_descriptor
AVCodecDescriptor.
Definition: avcodec.h:2090
int hwaccel_flags
Bit set of AV_HWACCEL_FLAG_* flags, which affect hardware accelerated decoding (if active).
Definition: avcodec.h:2287
attribute_deprecated int min_prediction_order
Definition: avcodec.h:1480
int subtitle_header_size
Definition: avcodec.h:2015
int width
picture width / height.
Definition: avcodec.h:699
AVPacketSideData * coded_side_data
Additional data associated with the entire coded stream.
Definition: avcodec.h:2201
int64_t pts_correction_num_faulty_dts
Number of incorrect PTS values so far.
Definition: avcodec.h:2107
attribute_deprecated int i_count
Definition: avcodec.h:1527
char * stats_out
pass1 encoding statistics output buffer
Definition: avcodec.h:1545
int rc_buffer_size
decoder bitstream buffer size
Definition: avcodec.h:1389
attribute_deprecated int header_bits
Definition: avcodec.h:1521
int64_t pts_correction_last_pts
Number of incorrect DTS values so far.
Definition: avcodec.h:2108
attribute_deprecated int refcounted_frames
If non-zero, the decoded audio and video frames returned from avcodec_decode_video2() and avcodec_dec...
Definition: avcodec.h:1357
int me_cmp
motion estimation comparison function
Definition: avcodec.h:912
int flags2
AV_CODEC_FLAG2_*.
Definition: avcodec.h:613
enum AVSampleFormat sample_fmt
audio sample format
Definition: avcodec.h:1194
int debug
debug
Definition: avcodec.h:1611
enum AVPixelFormat sw_pix_fmt
Nominal unaccelerated pixel format, see AV_PIX_FMT_xxx.
Definition: avcodec.h:2076
int global_quality
Global quality for codecs which cannot change it per frame.
Definition: avcodec.h:592
int64_t max_pixels
The number of pixels per image to maximally accept.
Definition: avcodec.h:2256
attribute_deprecated int coder_type
Definition: avcodec.h:1443
attribute_deprecated int scenechange_threshold
Definition: avcodec.h:1040
enum AVColorRange color_range
MPEG vs JPEG YUV range.
Definition: avcodec.h:1161
char * sub_charenc
DTS of the last frame.
Definition: avcodec.h:2116
int error_concealment
error concealment flags
Definition: avcodec.h:1601
int dct_algo
DCT algorithm, see FF_DCT_* below.
Definition: avcodec.h:1716
unsigned int codec_tag
fourcc (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A').
Definition: avcodec.h:551
int slice_flags
slice flags
Definition: avcodec.h:1004
int strict_std_compliance
strictly follow the standard (MPEG-4, ...).
Definition: avcodec.h:1589
float b_quant_offset
qscale offset between IP and B-frames
Definition: avcodec.h:808
int nb_coded_side_data
Definition: avcodec.h:2202
AVRational pkt_timebase
Timebase in which pkt_dts/pts and AVPacket.dts/pts are.
Definition: avcodec.h:2083
attribute_deprecated int frame_bits
Definition: avcodec.h:1537
attribute_deprecated int chromaoffset
Definition: avcodec.h:1119
attribute_deprecated int mv_bits
Definition: avcodec.h:1519
enum AVPixelFormat(* get_format)(struct AVCodecContext *s, const enum AVPixelFormat *fmt)
callback to negotiate the pixelFormat
Definition: avcodec.h:778
enum AVAudioServiceType audio_service_type
Type of service that the audio stream conveys.
Definition: avcodec.h:1251
enum AVColorPrimaries color_primaries
Chromaticity coordinates of the source primaries.
Definition: avcodec.h:1140
int me_subpel_quality
subpel ME quality
Definition: avcodec.h:988
AVBufferRef * hw_frames_ctx
A reference to the AVHWFramesContext describing the input (for encoding) or output (decoding) frames.
Definition: avcodec.h:2226
int max_b_frames
maximum number of B-frames between non-B-frames Note: The output will be delayed by max_b_frames+1 re...
Definition: avcodec.h:786
int mb_lmax
maximum MB Lagrange multiplier
Definition: avcodec.h:1080
int qmin
minimum quantizer
Definition: avcodec.h:1368
int keyint_min
minimum GOP size
Definition: avcodec.h:1107
enum AVMediaType codec_type
Definition: avcodec.h:534
float b_quant_factor
qscale factor between IP and B-frames If > 0 then the last P-frame quantizer will be used (q= lastp_q...
Definition: avcodec.h:795
int dia_size
ME diamond size & shape.
Definition: avcodec.h:954
int workaround_bugs
Work around bugs in encoders which sometimes cannot be detected automatically.
Definition: avcodec.h:1560
attribute_deprecated int b_sensitivity
Definition: avcodec.h:1132
int apply_cropping
Video decoding only.
Definition: avcodec.h:2314
AVRational framerate
Definition: avcodec.h:2069
int bidir_refine
Definition: avcodec.h:1094
char * stats_in
pass2 encoding statistics input buffer Concatenated stuff from stats_out of pass1 should be placed he...
Definition: avcodec.h:1553
AVRational sample_aspect_ratio
sample aspect ratio (0 if unknown) That is the width of a pixel divided by the height of the pixel.
Definition: avcodec.h:905
int bits_per_coded_sample
bits per sample/pixel from the demuxer (needed for huffyuv).
Definition: avcodec.h:1750
int rc_override_count
ratecontrol override, see RcOverride
Definition: avcodec.h:1396
uint8_t * dump_separator
dump format separator.
Definition: avcodec.h:2176
attribute_deprecated AVFrame * coded_frame
the picture in the bitstream
Definition: avcodec.h:1776
int slice_count
slice count
Definition: avcodec.h:880
attribute_deprecated int max_prediction_order
Definition: avcodec.h:1484
int thread_safe_callbacks
Set by the client if its custom get_buffer() callback can be called synchronously from another thread...
Definition: avcodec.h:1814
int ticks_per_frame
For some codecs, the time base is closer to the field rate than the frame rate.
Definition: avcodec.h:658
enum AVFieldOrder field_order
Field order.
Definition: avcodec.h:1183
uint16_t * inter_matrix
custom inter quantization matrix Must be allocated with the av_malloc() family of functions,...
Definition: avcodec.h:1035
const struct AVHWAccel * hwaccel
Hardware accelerator in use.
Definition: avcodec.h:1690
int active_thread_type
Which multithreading methods are in use by the codec.
Definition: avcodec.h:1804
int sub_charenc_mode
Subtitles character encoding mode.
Definition: avcodec.h:2124
int64_t reordered_opaque
opaque 64-bit number (generally a PTS) that will be reordered and output in AVFrame....
Definition: avcodec.h:1683
int bit_rate_tolerance
number of bits the bitstream is allowed to diverge from the reference.
Definition: avcodec.h:584
int mb_decision
macroblock decision mode
Definition: avcodec.h:1014
attribute_deprecated int misc_bits
Definition: avcodec.h:1533
int has_b_frames
Size of the frame reordering buffer in the decoder.
Definition: avcodec.h:816
char * codec_whitelist
',' separated list of allowed decoders.
Definition: avcodec.h:2184
int level
level
Definition: avcodec.h:1982
void(* draw_horiz_band)(struct AVCodecContext *s, const AVFrame *src, int offset[AV_NUM_DATA_POINTERS], int y, int type, int height)
If non NULL, 'draw_horiz_band' is called by the libavcodec decoder to draw a horizontal band.
Definition: avcodec.h:761
attribute_deprecated int frame_skip_threshold
Definition: avcodec.h:1455
int64_t bit_rate
the average bitrate
Definition: avcodec.h:576
enum AVDiscard skip_loop_filter
Skip loop filtering for selected frames.
Definition: avcodec.h:1990
int64_t pts_correction_num_faulty_pts
Current statistics for PTS correction.
Definition: avcodec.h:2106
const struct AVCodec * codec
Definition: avcodec.h:535
int rc_initial_buffer_occupancy
Number of bits which should be loaded into the rc buffer before decoding starts.
Definition: avcodec.h:1432
int thread_type
Which multithreading methods to use.
Definition: avcodec.h:1795
attribute_deprecated int frame_skip_cmp
Definition: avcodec.h:1467
int me_sub_cmp
subpixel motion estimation comparison function
Definition: avcodec.h:918
attribute_deprecated int p_count
Definition: avcodec.h:1529
int profile
profile
Definition: avcodec.h:1859
unsigned properties
Properties of the stream that gets decoded.
Definition: avcodec.h:2191
int last_predictor_count
amount of previous MV predictors (2a+1 x 2a+1 square)
Definition: avcodec.h:961
int log_level_offset
Definition: avcodec.h:532
int(* execute)(struct AVCodecContext *c, int(*func)(struct AVCodecContext *c2, void *arg), void *arg2, int *ret, int count, int size)
The codec may call this to execute several independent things.
Definition: avcodec.h:1825
int bits_per_raw_sample
Bits per sample/pixel of internal libavcodec pixel/sample format.
Definition: avcodec.h:1757
int idct_algo
IDCT algorithm, see FF_IDCT_* below.
Definition: avcodec.h:1729
int export_side_data
Bit set of AV_CODEC_EXPORT_DATA_* flags, which affects the kind of metadata exported in frame,...
Definition: avcodec.h:2354
enum AVColorSpace colorspace
YUV colorspace type.
Definition: avcodec.h:1154
int sub_text_format
Control the form of AVSubtitle.rects[N]->ass.
Definition: avcodec.h:2233
enum AVSampleFormat request_sample_fmt
desired sample format
Definition: avcodec.h:1259
attribute_deprecated int mpeg_quant
Definition: avcodec.h:821
int initial_padding
Audio only.
Definition: avcodec.h:2060
float temporal_cplx_masking
temporary complexity masking (0-> disabled)
Definition: avcodec.h:852
int sample_rate
samples per second
Definition: avcodec.h:1186
const AVClass * av_class
information on struct for av_log
Definition: avcodec.h:531
float p_masking
p block masking (0-> disabled)
Definition: avcodec.h:866
int delay
Codec delay.
Definition: avcodec.h:682
float dark_masking
darkness masking (0-> disabled)
Definition: avcodec.h:873
attribute_deprecated int64_t timecode_frame_start
Definition: avcodec.h:1488
int mb_cmp
macroblock comparison function (not supported yet)
Definition: avcodec.h:924
int gop_size
the number of pictures in a group of pictures, or 0 for intra_only
Definition: avcodec.h:721
uint64_t request_channel_layout
Request decoder to use this channel layout if it can (0 for default)
Definition: avcodec.h:1244
int frame_number
Frame counter, set by libavcodec.
Definition: avcodec.h:1217
attribute_deprecated int rtp_payload_size
Definition: avcodec.h:1508
int skip_alpha
Skip processing alpha if supported by codec.
Definition: avcodec.h:2142
int refs
number of reference frames
Definition: avcodec.h:1114
int ildct_cmp
interlaced DCT comparison function
Definition: avcodec.h:930
int mv0_threshold
Note: Value depends upon the compare function used for fullpel ME.
Definition: avcodec.h:1127
int mb_lmin
minimum MB Lagrange multiplier
Definition: avcodec.h:1073
int64_t rc_max_rate
maximum bitrate
Definition: avcodec.h:1404
int compression_level
Definition: avcodec.h:598
int discard_damaged_percentage
The percentage of damaged samples to discard a frame.
Definition: avcodec.h:2336
attribute_deprecated int me_penalty_compensation
Definition: avcodec.h:1087
int thread_count
thread count is used to decide how many independent tasks should be passed to execute()
Definition: avcodec.h:1785
void * opaque
Private data of the user, can be used to carry app specific stuff.
Definition: avcodec.h:568
int qmax
maximum quantizer
Definition: avcodec.h:1375
void * hwaccel_context
Hardware accelerator context.
Definition: avcodec.h:1702
uint16_t * intra_matrix
custom intra quantization matrix Must be allocated with the av_malloc() family of functions,...
Definition: avcodec.h:1026
int coded_height
Definition: avcodec.h:714
enum AVColorTransferCharacteristic color_trc
Color Transfer Characteristic.
Definition: avcodec.h:1147
float rc_min_vbv_overflow_use
Ratecontrol attempt to use, at least, times the amount needed to prevent a vbv overflow.
Definition: avcodec.h:1425
uint8_t * subtitle_header
Header containing style information for text subtitles.
Definition: avcodec.h:2014
AVRational time_base
This is the fundamental unit of time (in seconds) in terms of which frame timestamps are represented.
Definition: avcodec.h:649
attribute_deprecated int i_tex_bits
Definition: avcodec.h:1523
int flags
AV_CODEC_FLAG_*.
Definition: avcodec.h:606
int seek_preroll
Number of samples to skip after a discontinuity.
Definition: avcodec.h:2149
attribute_deprecated int frame_skip_exp
Definition: avcodec.h:1463
uint8_t * extradata
some codecs need / can use extradata like Huffman tables.
Definition: avcodec.h:627
int me_pre_cmp
motion estimation prepass comparison function
Definition: avcodec.h:974
attribute_deprecated int prediction_method
Definition: avcodec.h:885
int channels
number of audio channels
Definition: avcodec.h:1187
int64_t rc_min_rate
minimum bitrate
Definition: avcodec.h:1411
int trailing_padding
Audio only.
Definition: avcodec.h:2248
enum AVDiscard skip_idct
Skip IDCT/dequantization for selected frames.
Definition: avcodec.h:1997
int intra_dc_precision
precision of the intra DC coefficient - 8
Definition: avcodec.h:1052
enum AVChromaLocation chroma_sample_location
This defines the location of chroma samples.
Definition: avcodec.h:1168
int(* execute2)(struct AVCodecContext *c, int(*func)(struct AVCodecContext *c2, void *arg, int jobnr, int threadnr), void *arg2, int *ret, int count)
The codec may call this to execute several independent things.
Definition: avcodec.h:1845
uint64_t error[AV_NUM_DATA_POINTERS]
error
Definition: avcodec.h:1709
attribute_deprecated int p_tex_bits
Definition: avcodec.h:1525
attribute_deprecated int context_model
Definition: avcodec.h:1449
float qcompress
amount of qscale change between easy & hard scenes (0.0-1.0)
Definition: avcodec.h:1360
float qblur
amount of qscale smoothing over time (0.0-1.0)
Definition: avcodec.h:1361
AVBufferRef * hw_device_ctx
A reference to the AVHWDeviceContext describing the device which will be used by a hardware encoder/d...
Definition: avcodec.h:2278
int me_range
maximum motion estimation search range in subpel units If 0 then no limit.
Definition: avcodec.h:997
attribute_deprecated int noise_reduction
Definition: avcodec.h:1044
int extra_hw_frames
Definition: avcodec.h:2328
attribute_deprecated int side_data_only_packets
Encoding only and set by default.
Definition: avcodec.h:2042
attribute_deprecated int skip_count
Definition: avcodec.h:1531
int debug_mv
debug motion vectors
Definition: avcodec.h:2157
RcOverride * rc_override
Definition: avcodec.h:1397
int64_t max_samples
The number of samples per frame to maximally accept.
Definition: avcodec.h:2344
enum AVCodecID codec_id
Definition: avcodec.h:536
attribute_deprecated int b_frame_strategy
Definition: avcodec.h:800
int pre_dia_size
ME prepass diamond size & shape.
Definition: avcodec.h:981
float lumi_masking
luminance masking (0-> disabled)
Definition: avcodec.h:845
int extradata_size
Definition: avcodec.h:628
int cutoff
Audio cutoff bandwidth (0 means "automatic")
Definition: avcodec.h:1230
int skip_bottom
Number of macroblock rows at the bottom which are skipped.
Definition: avcodec.h:1066
int coded_width
Bitstream width / height, may be different from width/height e.g.
Definition: avcodec.h:714
int block_align
number of bytes per packet if constant and known or 0 Used by some WAV based audio codecs.
Definition: avcodec.h:1223
attribute_deprecated void(* rtp_callback)(struct AVCodecContext *avctx, void *data, int size, int mb_nb)
Definition: avcodec.h:1502
attribute_deprecated int frame_skip_factor
Definition: avcodec.h:1459
attribute_deprecated uint64_t vbv_delay
VBV delay coded in the last frame (in periods of a 27 MHz clock).
Definition: avcodec.h:2027
uint64_t channel_layout
Audio channel layout.
Definition: avcodec.h:1237
int frame_size
Number of samples per channel in an audio frame.
Definition: avcodec.h:1206
int * slice_offset
slice offsets in the frame in bytes
Definition: avcodec.h:896
float i_quant_factor
qscale factor between P- and I-frames If > 0 then the last P-frame quantizer will be used (q = lastp_...
Definition: avcodec.h:831
int(* get_buffer2)(struct AVCodecContext *s, AVFrame *frame, int flags)
This callback is called at the beginning of each frame to get data buffer(s) for it.
Definition: avcodec.h:1341
int lowres
low resolution decoding, 1-> 1/2 size, 2->1/4 size
Definition: avcodec.h:1765
void * priv_data
Definition: avcodec.h:553
float spatial_cplx_masking
spatial complexity masking (0-> disabled)
Definition: avcodec.h:859
enum AVDiscard skip_frame
Skip decoding for selected frames.
Definition: avcodec.h:2004
int err_recognition
Error recognition; may misdetect some more or less valid parts as errors.
Definition: avcodec.h:1655
float i_quant_offset
qscale offset between P and I-frames
Definition: avcodec.h:838
int slices
Number of slices.
Definition: avcodec.h:1177
This struct describes the properties of a single codec described by an AVCodecID.
Definition: codec_desc.h:38
This struct describes the properties of an encoded stream.
Definition: codec_par.h:52
int duration
Duration of the current frame.
Definition: avcodec.h:3486
int dts_ref_dts_delta
Offset of the current timestamp against last timestamp sync point in units of AVCodecContext....
Definition: avcodec.h:3448
int64_t cur_frame_end[AV_PARSER_PTS_NB]
Definition: avcodec.h:3405
int width
Dimensions of the decoded video intended for presentation.
Definition: avcodec.h:3511
enum AVFieldOrder field_order
Definition: avcodec.h:3488
struct AVCodecParser * parser
Definition: avcodec.h:3366
int64_t pos
Byte position of currently parsed frame in stream.
Definition: avcodec.h:3474
int format
The format of the coded data, corresponds to enum AVPixelFormat for video and for enum AVSampleFormat...
Definition: avcodec.h:3528
int repeat_pict
This field is used for proper frame duration computation in lavf.
Definition: avcodec.h:3382
enum AVPictureStructure picture_structure
Indicate whether a picture is coded as a frame, top field or bottom field.
Definition: avcodec.h:3498
int64_t cur_frame_dts[AV_PARSER_PTS_NB]
Definition: avcodec.h:3395
int64_t cur_frame_pos[AV_PARSER_PTS_NB]
Position of the packet in file.
Definition: avcodec.h:3469
attribute_deprecated int64_t convergence_duration
Definition: avcodec.h:3420
int output_picture_number
Picture number incremented in presentation or output order.
Definition: avcodec.h:3506
int pts_dts_delta
Presentation delay of current frame in units of AVCodecContext.time_base.
Definition: avcodec.h:3462
int64_t next_frame_offset
Definition: avcodec.h:3370
int64_t cur_frame_pts[AV_PARSER_PTS_NB]
Definition: avcodec.h:3394
int64_t cur_frame_offset[AV_PARSER_PTS_NB]
Definition: avcodec.h:3393
int key_frame
Set by parser to 1 for key frames and 0 for non-key frames.
Definition: avcodec.h:3413
int64_t frame_offset
Definition: avcodec.h:3367
int64_t last_pos
Previous frame byte position.
Definition: avcodec.h:3479
int coded_width
Dimensions of the coded video.
Definition: avcodec.h:3517
int64_t offset
byte offset from starting packet start
Definition: avcodec.h:3404
int dts_sync_point
Synchronization point for start of timestamp generation.
Definition: avcodec.h:3433
int codec_ids[5]
Definition: avcodec.h:3532
int priv_data_size
Definition: avcodec.h:3533
int(* split)(AVCodecContext *avctx, const uint8_t *buf, int buf_size)
Definition: avcodec.h:3542
void(* parser_close)(AVCodecParserContext *s)
Definition: avcodec.h:3541
int(* parser_parse)(AVCodecParserContext *s, AVCodecContext *avctx, const uint8_t **poutbuf, int *poutbuf_size, const uint8_t *buf, int buf_size)
Definition: avcodec.h:3537
int(* parser_init)(AVCodecParserContext *s)
Definition: avcodec.h:3534
struct AVCodecParser * next
Definition: avcodec.h:3543
AVCodec.
Definition: codec.h:190
This structure describes decoded (raw) audio or video data.
Definition: frame.h:300
int priv_data_size
Size of the private data to allocate in AVCodecInternal.hwaccel_priv_data.
Definition: avcodec.h:2554
int(* alloc_frame)(AVCodecContext *avctx, AVFrame *frame)
Allocate a custom buffer.
Definition: avcodec.h:2456
int(* uninit)(AVCodecContext *avctx)
Uninitialize the hwaccel private data.
Definition: avcodec.h:2548
enum AVCodecID id
Codec implemented by the hardware accelerator.
Definition: avcodec.h:2430
int(* start_frame)(AVCodecContext *avctx, const uint8_t *buf, uint32_t buf_size)
Called at the beginning of each frame or field picture.
Definition: avcodec.h:2472
void(* abort_frame)(AVCodecContext *avctx)
Called if parsing fails.
Definition: avcodec.h:2580
void(* decode_mb)(struct MpegEncContext *s)
Called for every Macroblock in a slice.
Definition: avcodec.h:2531
int(* init)(AVCodecContext *avctx)
Initialize the hwaccel private data.
Definition: avcodec.h:2540
const char * name
Name of the hardware accelerated codec.
Definition: avcodec.h:2416
int capabilities
Hardware accelerated codec capabilities.
Definition: avcodec.h:2443
int(* decode_slice)(AVCodecContext *avctx, const uint8_t *buf, uint32_t buf_size)
Callback for each slice.
Definition: avcodec.h:2500
int(* frame_params)(AVCodecContext *avctx, AVBufferRef *hw_frames_ctx)
Fill the given hw_frames context with current codec parameters.
Definition: avcodec.h:2569
int(* decode_params)(AVCodecContext *avctx, int type, const uint8_t *buf, uint32_t buf_size)
Callback for parameter data (SPS/PPS/VPS etc).
Definition: avcodec.h:2486
enum AVPixelFormat pix_fmt
Supported pixel format.
Definition: avcodec.h:2437
int caps_internal
Internal hwaccel capabilities.
Definition: avcodec.h:2559
int(* end_frame)(AVCodecContext *avctx)
Called at the end of each frame or field picture.
Definition: avcodec.h:2511
int frame_priv_data_size
Size of per-frame hardware accelerator private data.
Definition: avcodec.h:2520
enum AVMediaType type
Type of codec implemented by the hardware accelerator.
Definition: avcodec.h:2423
This structure stores compressed data.
Definition: packet.h:332
Pan Scan area.
Definition: avcodec.h:419
int id
id
Definition: avcodec.h:425
int width
width and height in 1/16 pel
Definition: avcodec.h:432
int height
Definition: avcodec.h:433
int16_t position[3][2]
position of the top left corner in 1/16 pel for up to 3 fields/frames
Definition: avcodec.h:440
Picture data structure.
Definition: avcodec.h:2638
attribute_deprecated uint8_t * data[AV_NUM_DATA_POINTERS]
pointers to the image data planes
Definition: avcodec.h:2640
attribute_deprecated int linesize[AV_NUM_DATA_POINTERS]
number of bytes per line
Definition: avcodec.h:2642
This structure supplies correlation between a packet timestamp and a wall clock production time.
Definition: avcodec.h:498
int64_t wallclock
A UTC timestamp, in microseconds, since Unix epoch (e.g, av_gettime()).
Definition: avcodec.h:502
Rational number (pair of numerator and denominator).
Definition: rational.h:58
int x
top left corner of pict, undefined when pict is not set
Definition: avcodec.h:2671
char * ass
0 terminated ASS/SSA compatible event line.
Definition: avcodec.h:2700
int w
width of pict, undefined when pict is not set
Definition: avcodec.h:2673
attribute_deprecated AVPicture pict
Definition: avcodec.h:2682
int nb_colors
number of colors in pict, undefined when pict is not set
Definition: avcodec.h:2675
char * text
0 terminated plain UTF-8 text
Definition: avcodec.h:2693
uint8_t * data[4]
data+linesize for the bitmap of this subtitle.
Definition: avcodec.h:2688
int y
top left corner of pict, undefined when pict is not set
Definition: avcodec.h:2672
enum AVSubtitleType type
Definition: avcodec.h:2691
int linesize[4]
Definition: avcodec.h:2689
int h
height of pict, undefined when pict is not set
Definition: avcodec.h:2674
uint16_t format
Definition: avcodec.h:2706
uint32_t start_display_time
Definition: avcodec.h:2707
uint32_t end_display_time
Definition: avcodec.h:2708
unsigned num_rects
Definition: avcodec.h:2709
AVSubtitleRect ** rects
Definition: avcodec.h:2710
int64_t pts
Same as packet pts, in AV_TIME_BASE.
Definition: avcodec.h:2711
int qscale
Definition: avcodec.h:258
int start_frame
Definition: avcodec.h:256
int end_frame
Definition: avcodec.h:257
float quality_factor
Definition: avcodec.h:259
static int64_t pts