FFmpeg
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 "libavutil/samplefmt.h"
31 #include "libavutil/attributes.h"
32 #include "libavutil/avutil.h"
33 #include "libavutil/buffer.h"
34 #include "libavutil/dict.h"
35 #include "libavutil/frame.h"
36 #include "libavutil/log.h"
37 #include "libavutil/pixfmt.h"
38 #include "libavutil/rational.h"
39 
40 #include "codec.h"
41 #include "codec_desc.h"
42 #include "codec_par.h"
43 #include "codec_id.h"
44 #include "defs.h"
45 #include "packet.h"
46 #include "version_major.h"
47 #ifndef HAVE_AV_CONFIG_H
48 /* When included as part of the ffmpeg build, only include the major version
49  * to avoid unnecessary rebuilds. When included externally, keep including
50  * the full version information. */
51 #include "version.h"
52 #endif
53 
54 /**
55  * @defgroup libavc libavcodec
56  * Encoding/Decoding Library
57  *
58  * @{
59  *
60  * @defgroup lavc_decoding Decoding
61  * @{
62  * @}
63  *
64  * @defgroup lavc_encoding Encoding
65  * @{
66  * @}
67  *
68  * @defgroup lavc_codec Codecs
69  * @{
70  * @defgroup lavc_codec_native Native Codecs
71  * @{
72  * @}
73  * @defgroup lavc_codec_wrappers External library wrappers
74  * @{
75  * @}
76  * @defgroup lavc_codec_hwaccel Hardware Accelerators bridge
77  * @{
78  * @}
79  * @}
80  * @defgroup lavc_internal Internal
81  * @{
82  * @}
83  * @}
84  */
85 
86 /**
87  * @ingroup libavc
88  * @defgroup lavc_encdec send/receive encoding and decoding API overview
89  * @{
90  *
91  * The avcodec_send_packet()/avcodec_receive_frame()/avcodec_send_frame()/
92  * avcodec_receive_packet() functions provide an encode/decode API, which
93  * decouples input and output.
94  *
95  * The API is very similar for encoding/decoding and audio/video, and works as
96  * follows:
97  * - Set up and open the AVCodecContext as usual.
98  * - Send valid input:
99  * - For decoding, call avcodec_send_packet() to give the decoder raw
100  * compressed data in an AVPacket.
101  * - For encoding, call avcodec_send_frame() to give the encoder an AVFrame
102  * containing uncompressed audio or video.
103  *
104  * In both cases, it is recommended that AVPackets and AVFrames are
105  * refcounted, or libavcodec might have to copy the input data. (libavformat
106  * always returns refcounted AVPackets, and av_frame_get_buffer() allocates
107  * refcounted AVFrames.)
108  * - Receive output in a loop. Periodically call one of the avcodec_receive_*()
109  * functions and process their output:
110  * - For decoding, call avcodec_receive_frame(). On success, it will return
111  * an AVFrame containing uncompressed audio or video data.
112  * - For encoding, call avcodec_receive_packet(). On success, it will return
113  * an AVPacket with a compressed frame.
114  *
115  * Repeat this call until it returns AVERROR(EAGAIN) or an error. The
116  * AVERROR(EAGAIN) return value means that new input data is required to
117  * return new output. In this case, continue with sending input. For each
118  * input frame/packet, the codec will typically return 1 output frame/packet,
119  * but it can also be 0 or more than 1.
120  *
121  * At the beginning of decoding or encoding, the codec might accept multiple
122  * input frames/packets without returning a frame, until its internal buffers
123  * are filled. This situation is handled transparently if you follow the steps
124  * outlined above.
125  *
126  * In theory, sending input can result in EAGAIN - this should happen only if
127  * not all output was received. You can use this to structure alternative decode
128  * or encode loops other than the one suggested above. For example, you could
129  * try sending new input on each iteration, and try to receive output if that
130  * returns EAGAIN.
131  *
132  * End of stream situations. These require "flushing" (aka draining) the codec,
133  * as the codec might buffer multiple frames or packets internally for
134  * performance or out of necessity (consider B-frames).
135  * This is handled as follows:
136  * - Instead of valid input, send NULL to the avcodec_send_packet() (decoding)
137  * or avcodec_send_frame() (encoding) functions. This will enter draining
138  * mode.
139  * - Call avcodec_receive_frame() (decoding) or avcodec_receive_packet()
140  * (encoding) in a loop until AVERROR_EOF is returned. The functions will
141  * not return AVERROR(EAGAIN), unless you forgot to enter draining mode.
142  * - Before decoding can be resumed again, the codec has to be reset with
143  * avcodec_flush_buffers().
144  *
145  * Using the API as outlined above is highly recommended. But it is also
146  * possible to call functions outside of this rigid schema. For example, you can
147  * call avcodec_send_packet() repeatedly without calling
148  * avcodec_receive_frame(). In this case, avcodec_send_packet() will succeed
149  * until the codec's internal buffer has been filled up (which is typically of
150  * size 1 per output frame, after initial input), and then reject input with
151  * AVERROR(EAGAIN). Once it starts rejecting input, you have no choice but to
152  * read at least some output.
153  *
154  * Not all codecs will follow a rigid and predictable dataflow; the only
155  * guarantee is that an AVERROR(EAGAIN) return value on a send/receive call on
156  * one end implies that a receive/send call on the other end will succeed, or
157  * at least will not fail with AVERROR(EAGAIN). In general, no codec will
158  * permit unlimited buffering of input or output.
159  *
160  * A codec is not allowed to return AVERROR(EAGAIN) for both sending and receiving. This
161  * would be an invalid state, which could put the codec user into an endless
162  * loop. The API has no concept of time either: it cannot happen that trying to
163  * do avcodec_send_packet() results in AVERROR(EAGAIN), but a repeated call 1 second
164  * later accepts the packet (with no other receive/flush API calls involved).
165  * The API is a strict state machine, and the passage of time is not supposed
166  * to influence it. Some timing-dependent behavior might still be deemed
167  * acceptable in certain cases. But it must never result in both send/receive
168  * returning EAGAIN at the same time at any point. It must also absolutely be
169  * avoided that the current state is "unstable" and can "flip-flop" between
170  * the send/receive APIs allowing progress. For example, it's not allowed that
171  * the codec randomly decides that it actually wants to consume a packet now
172  * instead of returning a frame, after it just returned AVERROR(EAGAIN) on an
173  * avcodec_send_packet() call.
174  * @}
175  */
176 
177 /**
178  * @defgroup lavc_core Core functions/structures.
179  * @ingroup libavc
180  *
181  * Basic definitions, functions for querying libavcodec capabilities,
182  * allocating core structures, etc.
183  * @{
184  */
185 
186 /**
187  * @ingroup lavc_encoding
188  * minimum encoding buffer size
189  * Used to avoid some checks during header writing.
190  */
191 #define AV_INPUT_BUFFER_MIN_SIZE 16384
192 
193 /**
194  * @ingroup lavc_encoding
195  */
196 typedef struct RcOverride{
199  int qscale; // If this is 0 then quality_factor will be used instead.
201 } RcOverride;
202 
203 /* encoding support
204  These flags can be passed in AVCodecContext.flags before initialization.
205  Note: Not everything is supported yet.
206 */
207 
208 /**
209  * Allow decoders to produce frames with data planes that are not aligned
210  * to CPU requirements (e.g. due to cropping).
211  */
212 #define AV_CODEC_FLAG_UNALIGNED (1 << 0)
213 /**
214  * Use fixed qscale.
215  */
216 #define AV_CODEC_FLAG_QSCALE (1 << 1)
217 /**
218  * 4 MV per MB allowed / advanced prediction for H.263.
219  */
220 #define AV_CODEC_FLAG_4MV (1 << 2)
221 /**
222  * Output even those frames that might be corrupted.
223  */
224 #define AV_CODEC_FLAG_OUTPUT_CORRUPT (1 << 3)
225 /**
226  * Use qpel MC.
227  */
228 #define AV_CODEC_FLAG_QPEL (1 << 4)
229 /**
230  * Don't output frames whose parameters differ from first
231  * decoded frame in stream.
232  */
233 #define AV_CODEC_FLAG_DROPCHANGED (1 << 5)
234 /**
235  * Request the encoder to output reconstructed frames, i.e.\ frames that would
236  * be produced by decoding the encoded bistream. These frames may be retrieved
237  * by calling avcodec_receive_frame() immediately after a successful call to
238  * avcodec_receive_packet().
239  *
240  * Should only be used with encoders flagged with the
241  * @ref AV_CODEC_CAP_ENCODER_RECON_FRAME capability.
242  */
243 #define AV_CODEC_FLAG_RECON_FRAME (1 << 6)
244 /**
245  * @par decoding
246  * Request the decoder to propagate each packets AVPacket.opaque and
247  * AVPacket.opaque_ref to its corresponding output AVFrame.
248  *
249  * @par encoding:
250  * Request the encoder to propagate each frame's AVFrame.opaque and
251  * AVFrame.opaque_ref values to its corresponding output AVPacket.
252  *
253  * @par
254  * May only be set on encoders that have the
255  * @ref AV_CODEC_CAP_ENCODER_REORDERED_OPAQUE capability flag.
256  *
257  * @note
258  * While in typical cases one input frame produces exactly one output packet
259  * (perhaps after a delay), in general the mapping of frames to packets is
260  * M-to-N, so
261  * - Any number of input frames may be associated with any given output packet.
262  * This includes zero - e.g. some encoders may output packets that carry only
263  * metadata about the whole stream.
264  * - A given input frame may be associated with any number of output packets.
265  * Again this includes zero - e.g. some encoders may drop frames under certain
266  * conditions.
267  * .
268  * This implies that when using this flag, the caller must NOT assume that
269  * - a given input frame's opaques will necessarily appear on some output packet;
270  * - every output packet will have some non-NULL opaque value.
271  * .
272  * When an output packet contains multiple frames, the opaque values will be
273  * taken from the first of those.
274  *
275  * @note
276  * The converse holds for decoders, with frames and packets switched.
277  */
278 #define AV_CODEC_FLAG_COPY_OPAQUE (1 << 7)
279 /**
280  * Signal to the encoder that the values of AVFrame.duration are valid and
281  * should be used (typically for transferring them to output packets).
282  *
283  * If this flag is not set, frame durations are ignored.
284  */
285 #define AV_CODEC_FLAG_FRAME_DURATION (1 << 8)
286 /**
287  * Use internal 2pass ratecontrol in first pass mode.
288  */
289 #define AV_CODEC_FLAG_PASS1 (1 << 9)
290 /**
291  * Use internal 2pass ratecontrol in second pass mode.
292  */
293 #define AV_CODEC_FLAG_PASS2 (1 << 10)
294 /**
295  * loop filter.
296  */
297 #define AV_CODEC_FLAG_LOOP_FILTER (1 << 11)
298 /**
299  * Only decode/encode grayscale.
300  */
301 #define AV_CODEC_FLAG_GRAY (1 << 13)
302 /**
303  * error[?] variables will be set during encoding.
304  */
305 #define AV_CODEC_FLAG_PSNR (1 << 15)
306 /**
307  * Use interlaced DCT.
308  */
309 #define AV_CODEC_FLAG_INTERLACED_DCT (1 << 18)
310 /**
311  * Force low delay.
312  */
313 #define AV_CODEC_FLAG_LOW_DELAY (1 << 19)
314 /**
315  * Place global headers in extradata instead of every keyframe.
316  */
317 #define AV_CODEC_FLAG_GLOBAL_HEADER (1 << 22)
318 /**
319  * Use only bitexact stuff (except (I)DCT).
320  */
321 #define AV_CODEC_FLAG_BITEXACT (1 << 23)
322 /* Fx : Flag for H.263+ extra options */
323 /**
324  * H.263 advanced intra coding / MPEG-4 AC prediction
325  */
326 #define AV_CODEC_FLAG_AC_PRED (1 << 24)
327 /**
328  * interlaced motion estimation
329  */
330 #define AV_CODEC_FLAG_INTERLACED_ME (1 << 29)
331 #define AV_CODEC_FLAG_CLOSED_GOP (1U << 31)
332 
333 /**
334  * Allow non spec compliant speedup tricks.
335  */
336 #define AV_CODEC_FLAG2_FAST (1 << 0)
337 /**
338  * Skip bitstream encoding.
339  */
340 #define AV_CODEC_FLAG2_NO_OUTPUT (1 << 2)
341 /**
342  * Place global headers at every keyframe instead of in extradata.
343  */
344 #define AV_CODEC_FLAG2_LOCAL_HEADER (1 << 3)
345 
346 /**
347  * Input bitstream might be truncated at a packet boundaries
348  * instead of only at frame boundaries.
349  */
350 #define AV_CODEC_FLAG2_CHUNKS (1 << 15)
351 /**
352  * Discard cropping information from SPS.
353  */
354 #define AV_CODEC_FLAG2_IGNORE_CROP (1 << 16)
355 
356 /**
357  * Show all frames before the first keyframe
358  */
359 #define AV_CODEC_FLAG2_SHOW_ALL (1 << 22)
360 /**
361  * Export motion vectors through frame side data
362  */
363 #define AV_CODEC_FLAG2_EXPORT_MVS (1 << 28)
364 /**
365  * Do not skip samples and export skip information as frame side data
366  */
367 #define AV_CODEC_FLAG2_SKIP_MANUAL (1 << 29)
368 /**
369  * Do not reset ASS ReadOrder field on flush (subtitles decoding)
370  */
371 #define AV_CODEC_FLAG2_RO_FLUSH_NOOP (1 << 30)
372 /**
373  * Generate/parse ICC profiles on encode/decode, as appropriate for the type of
374  * file. No effect on codecs which cannot contain embedded ICC profiles, or
375  * when compiled without support for lcms2.
376  */
377 #define AV_CODEC_FLAG2_ICC_PROFILES (1U << 31)
378 
379 /* Exported side data.
380  These flags can be passed in AVCodecContext.export_side_data before initialization.
381 */
382 /**
383  * Export motion vectors through frame side data
384  */
385 #define AV_CODEC_EXPORT_DATA_MVS (1 << 0)
386 /**
387  * Export encoder Producer Reference Time through packet side data
388  */
389 #define AV_CODEC_EXPORT_DATA_PRFT (1 << 1)
390 /**
391  * Decoding only.
392  * Export the AVVideoEncParams structure through frame side data.
393  */
394 #define AV_CODEC_EXPORT_DATA_VIDEO_ENC_PARAMS (1 << 2)
395 /**
396  * Decoding only.
397  * Do not apply film grain, export it instead.
398  */
399 #define AV_CODEC_EXPORT_DATA_FILM_GRAIN (1 << 3)
400 
401 /**
402  * The decoder will keep a reference to the frame and may reuse it later.
403  */
404 #define AV_GET_BUFFER_FLAG_REF (1 << 0)
405 
406 /**
407  * The encoder will keep a reference to the packet and may reuse it later.
408  */
409 #define AV_GET_ENCODE_BUFFER_FLAG_REF (1 << 0)
410 
411 struct AVCodecInternal;
412 
413 /**
414  * main external API structure.
415  * New fields can be added to the end with minor version bumps.
416  * Removal, reordering and changes to existing fields require a major
417  * version bump.
418  * You can use AVOptions (av_opt* / av_set/get*()) to access these fields from user
419  * applications.
420  * The name string for AVOptions options matches the associated command line
421  * parameter name and can be found in libavcodec/options_table.h
422  * The AVOption/command line parameter names differ in some cases from the C
423  * structure field names for historic reasons or brevity.
424  * sizeof(AVCodecContext) must not be used outside libav*.
425  */
426 typedef struct AVCodecContext {
427  /**
428  * information on struct for av_log
429  * - set by avcodec_alloc_context3
430  */
433 
434  enum AVMediaType codec_type; /* see AVMEDIA_TYPE_xxx */
435  const struct AVCodec *codec;
436  enum AVCodecID codec_id; /* see AV_CODEC_ID_xxx */
437 
438  /**
439  * fourcc (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A').
440  * This is used to work around some encoder bugs.
441  * A demuxer should set this to what is stored in the field used to identify the codec.
442  * If there are multiple such fields in a container then the demuxer should choose the one
443  * which maximizes the information about the used codec.
444  * If the codec tag field in a container is larger than 32 bits then the demuxer should
445  * remap the longer ID to 32 bits with a table or other structure. Alternatively a new
446  * extra_codec_tag + size could be added but for this a clear advantage must be demonstrated
447  * first.
448  * - encoding: Set by user, if not then the default based on codec_id will be used.
449  * - decoding: Set by user, will be converted to uppercase by libavcodec during init.
450  */
451  unsigned int codec_tag;
452 
453  void *priv_data;
454 
455  /**
456  * Private context used for internal data.
457  *
458  * Unlike priv_data, this is not codec-specific. It is used in general
459  * libavcodec functions.
460  */
461  struct AVCodecInternal *internal;
462 
463  /**
464  * Private data of the user, can be used to carry app specific stuff.
465  * - encoding: Set by user.
466  * - decoding: Set by user.
467  */
468  void *opaque;
469 
470  /**
471  * the average bitrate
472  * - encoding: Set by user; unused for constant quantizer encoding.
473  * - decoding: Set by user, may be overwritten by libavcodec
474  * if this info is available in the stream
475  */
476  int64_t bit_rate;
477 
478  /**
479  * number of bits the bitstream is allowed to diverge from the reference.
480  * the reference can be CBR (for CBR pass1) or VBR (for pass2)
481  * - encoding: Set by user; unused for constant quantizer encoding.
482  * - decoding: unused
483  */
485 
486  /**
487  * Global quality for codecs which cannot change it per frame.
488  * This should be proportional to MPEG-1/2/4 qscale.
489  * - encoding: Set by user.
490  * - decoding: unused
491  */
493 
494  /**
495  * - encoding: Set by user.
496  * - decoding: unused
497  */
499 #define FF_COMPRESSION_DEFAULT -1
500 
501  /**
502  * AV_CODEC_FLAG_*.
503  * - encoding: Set by user.
504  * - decoding: Set by user.
505  */
506  int flags;
507 
508  /**
509  * AV_CODEC_FLAG2_*
510  * - encoding: Set by user.
511  * - decoding: Set by user.
512  */
513  int flags2;
514 
515  /**
516  * some codecs need / can use extradata like Huffman tables.
517  * MJPEG: Huffman tables
518  * rv10: additional flags
519  * MPEG-4: global headers (they can be in the bitstream or here)
520  * The allocated memory should be AV_INPUT_BUFFER_PADDING_SIZE bytes larger
521  * than extradata_size to avoid problems if it is read with the bitstream reader.
522  * The bytewise contents of extradata must not depend on the architecture or CPU endianness.
523  * Must be allocated with the av_malloc() family of functions.
524  * - encoding: Set/allocated/freed by libavcodec.
525  * - decoding: Set/allocated/freed by user.
526  */
527  uint8_t *extradata;
529 
530  /**
531  * This is the fundamental unit of time (in seconds) in terms
532  * of which frame timestamps are represented. For fixed-fps content,
533  * timebase should be 1/framerate and timestamp increments should be
534  * identically 1.
535  * This often, but not always is the inverse of the frame rate or field rate
536  * for video. 1/time_base is not the average frame rate if the frame rate is not
537  * constant.
538  *
539  * Like containers, elementary streams also can store timestamps, 1/time_base
540  * is the unit in which these timestamps are specified.
541  * As example of such codec time base see ISO/IEC 14496-2:2001(E)
542  * vop_time_increment_resolution and fixed_vop_rate
543  * (fixed_vop_rate == 0 implies that it is different from the framerate)
544  *
545  * - encoding: MUST be set by user.
546  * - decoding: unused.
547  */
549 
550  /**
551  * For some codecs, the time base is closer to the field rate than the frame rate.
552  * Most notably, H.264 and MPEG-2 specify time_base as half of frame duration
553  * if no telecine is used ...
554  *
555  * Set to time_base ticks per frame. Default 1, e.g., H.264/MPEG-2 set it to 2.
556  */
558 
559  /**
560  * Codec delay.
561  *
562  * Encoding: Number of frames delay there will be from the encoder input to
563  * the decoder output. (we assume the decoder matches the spec)
564  * Decoding: Number of frames delay in addition to what a standard decoder
565  * as specified in the spec would produce.
566  *
567  * Video:
568  * Number of frames the decoded output will be delayed relative to the
569  * encoded input.
570  *
571  * Audio:
572  * For encoding, this field is unused (see initial_padding).
573  *
574  * For decoding, this is the number of samples the decoder needs to
575  * output before the decoder's output is valid. When seeking, you should
576  * start decoding this many samples prior to your desired seek point.
577  *
578  * - encoding: Set by libavcodec.
579  * - decoding: Set by libavcodec.
580  */
581  int delay;
582 
583 
584  /* video only */
585  /**
586  * picture width / height.
587  *
588  * @note Those fields may not match the values of the last
589  * AVFrame output by avcodec_receive_frame() due frame
590  * reordering.
591  *
592  * - encoding: MUST be set by user.
593  * - decoding: May be set by the user before opening the decoder if known e.g.
594  * from the container. Some decoders will require the dimensions
595  * to be set by the caller. During decoding, the decoder may
596  * overwrite those values as required while parsing the data.
597  */
598  int width, height;
599 
600  /**
601  * Bitstream width / height, may be different from width/height e.g. when
602  * the decoded frame is cropped before being output or lowres is enabled.
603  *
604  * @note Those field may not match the value of the last
605  * AVFrame output by avcodec_receive_frame() due frame
606  * reordering.
607  *
608  * - encoding: unused
609  * - decoding: May be set by the user before opening the decoder if known
610  * e.g. from the container. During decoding, the decoder may
611  * overwrite those values as required while parsing the data.
612  */
614 
615  /**
616  * the number of pictures in a group of pictures, or 0 for intra_only
617  * - encoding: Set by user.
618  * - decoding: unused
619  */
620  int gop_size;
621 
622  /**
623  * Pixel format, see AV_PIX_FMT_xxx.
624  * May be set by the demuxer if known from headers.
625  * May be overridden by the decoder if it knows better.
626  *
627  * @note This field may not match the value of the last
628  * AVFrame output by avcodec_receive_frame() due frame
629  * reordering.
630  *
631  * - encoding: Set by user.
632  * - decoding: Set by user if known, overridden by libavcodec while
633  * parsing the data.
634  */
635  enum AVPixelFormat pix_fmt;
636 
637  /**
638  * If non NULL, 'draw_horiz_band' is called by the libavcodec
639  * decoder to draw a horizontal band. It improves cache usage. Not
640  * all codecs can do that. You must check the codec capabilities
641  * beforehand.
642  * When multithreading is used, it may be called from multiple threads
643  * at the same time; threads might draw different parts of the same AVFrame,
644  * or multiple AVFrames, and there is no guarantee that slices will be drawn
645  * in order.
646  * The function is also used by hardware acceleration APIs.
647  * It is called at least once during frame decoding to pass
648  * the data needed for hardware render.
649  * In that mode instead of pixel data, AVFrame points to
650  * a structure specific to the acceleration API. The application
651  * reads the structure and can change some fields to indicate progress
652  * or mark state.
653  * - encoding: unused
654  * - decoding: Set by user.
655  * @param height the height of the slice
656  * @param y the y position of the slice
657  * @param type 1->top field, 2->bottom field, 3->frame
658  * @param offset offset into the AVFrame.data from which the slice should be read
659  */
660  void (*draw_horiz_band)(struct AVCodecContext *s,
661  const AVFrame *src, int offset[AV_NUM_DATA_POINTERS],
662  int y, int type, int height);
663 
664  /**
665  * Callback to negotiate the pixel format. Decoding only, may be set by the
666  * caller before avcodec_open2().
667  *
668  * Called by some decoders to select the pixel format that will be used for
669  * the output frames. This is mainly used to set up hardware acceleration,
670  * then the provided format list contains the corresponding hwaccel pixel
671  * formats alongside the "software" one. The software pixel format may also
672  * be retrieved from \ref sw_pix_fmt.
673  *
674  * This callback will be called when the coded frame properties (such as
675  * resolution, pixel format, etc.) change and more than one output format is
676  * supported for those new properties. If a hardware pixel format is chosen
677  * and initialization for it fails, the callback may be called again
678  * immediately.
679  *
680  * This callback may be called from different threads if the decoder is
681  * multi-threaded, but not from more than one thread simultaneously.
682  *
683  * @param fmt list of formats which may be used in the current
684  * configuration, terminated by AV_PIX_FMT_NONE.
685  * @warning Behavior is undefined if the callback returns a value other
686  * than one of the formats in fmt or AV_PIX_FMT_NONE.
687  * @return the chosen format or AV_PIX_FMT_NONE
688  */
689  enum AVPixelFormat (*get_format)(struct AVCodecContext *s, const enum AVPixelFormat * fmt);
690 
691  /**
692  * maximum number of B-frames between non-B-frames
693  * Note: The output will be delayed by max_b_frames+1 relative to the input.
694  * - encoding: Set by user.
695  * - decoding: unused
696  */
698 
699  /**
700  * qscale factor between IP and B-frames
701  * If > 0 then the last P-frame quantizer will be used (q= lastp_q*factor+offset).
702  * If < 0 then normal ratecontrol will be done (q= -normal_q*factor+offset).
703  * - encoding: Set by user.
704  * - decoding: unused
705  */
707 
708  /**
709  * qscale offset between IP and B-frames
710  * - encoding: Set by user.
711  * - decoding: unused
712  */
714 
715  /**
716  * Size of the frame reordering buffer in the decoder.
717  * For MPEG-2 it is 1 IPB or 0 low delay IP.
718  * - encoding: Set by libavcodec.
719  * - decoding: Set by libavcodec.
720  */
722 
723  /**
724  * qscale factor between P- and I-frames
725  * If > 0 then the last P-frame quantizer will be used (q = lastp_q * factor + offset).
726  * If < 0 then normal ratecontrol will be done (q= -normal_q*factor+offset).
727  * - encoding: Set by user.
728  * - decoding: unused
729  */
731 
732  /**
733  * qscale offset between P and I-frames
734  * - encoding: Set by user.
735  * - decoding: unused
736  */
738 
739  /**
740  * luminance masking (0-> disabled)
741  * - encoding: Set by user.
742  * - decoding: unused
743  */
745 
746  /**
747  * temporary complexity masking (0-> disabled)
748  * - encoding: Set by user.
749  * - decoding: unused
750  */
752 
753  /**
754  * spatial complexity masking (0-> disabled)
755  * - encoding: Set by user.
756  * - decoding: unused
757  */
759 
760  /**
761  * p block masking (0-> disabled)
762  * - encoding: Set by user.
763  * - decoding: unused
764  */
765  float p_masking;
766 
767  /**
768  * darkness masking (0-> disabled)
769  * - encoding: Set by user.
770  * - decoding: unused
771  */
773 
774  /**
775  * slice count
776  * - encoding: Set by libavcodec.
777  * - decoding: Set by user (or 0).
778  */
780 
781  /**
782  * slice offsets in the frame in bytes
783  * - encoding: Set/allocated by libavcodec.
784  * - decoding: Set/allocated by user (or NULL).
785  */
787 
788  /**
789  * sample aspect ratio (0 if unknown)
790  * That is the width of a pixel divided by the height of the pixel.
791  * Numerator and denominator must be relatively prime and smaller than 256 for some video standards.
792  * - encoding: Set by user.
793  * - decoding: Set by libavcodec.
794  */
796 
797  /**
798  * motion estimation comparison function
799  * - encoding: Set by user.
800  * - decoding: unused
801  */
802  int me_cmp;
803  /**
804  * subpixel motion estimation comparison function
805  * - encoding: Set by user.
806  * - decoding: unused
807  */
809  /**
810  * macroblock comparison function (not supported yet)
811  * - encoding: Set by user.
812  * - decoding: unused
813  */
814  int mb_cmp;
815  /**
816  * interlaced DCT comparison function
817  * - encoding: Set by user.
818  * - decoding: unused
819  */
821 #define FF_CMP_SAD 0
822 #define FF_CMP_SSE 1
823 #define FF_CMP_SATD 2
824 #define FF_CMP_DCT 3
825 #define FF_CMP_PSNR 4
826 #define FF_CMP_BIT 5
827 #define FF_CMP_RD 6
828 #define FF_CMP_ZERO 7
829 #define FF_CMP_VSAD 8
830 #define FF_CMP_VSSE 9
831 #define FF_CMP_NSSE 10
832 #define FF_CMP_W53 11
833 #define FF_CMP_W97 12
834 #define FF_CMP_DCTMAX 13
835 #define FF_CMP_DCT264 14
836 #define FF_CMP_MEDIAN_SAD 15
837 #define FF_CMP_CHROMA 256
838 
839  /**
840  * ME diamond size & shape
841  * - encoding: Set by user.
842  * - decoding: unused
843  */
844  int dia_size;
845 
846  /**
847  * amount of previous MV predictors (2a+1 x 2a+1 square)
848  * - encoding: Set by user.
849  * - decoding: unused
850  */
852 
853  /**
854  * motion estimation prepass comparison function
855  * - encoding: Set by user.
856  * - decoding: unused
857  */
859 
860  /**
861  * ME prepass diamond size & shape
862  * - encoding: Set by user.
863  * - decoding: unused
864  */
866 
867  /**
868  * subpel ME quality
869  * - encoding: Set by user.
870  * - decoding: unused
871  */
873 
874  /**
875  * maximum motion estimation search range in subpel units
876  * If 0 then no limit.
877  *
878  * - encoding: Set by user.
879  * - decoding: unused
880  */
881  int me_range;
882 
883  /**
884  * slice flags
885  * - encoding: unused
886  * - decoding: Set by user.
887  */
889 #define SLICE_FLAG_CODED_ORDER 0x0001 ///< draw_horiz_band() is called in coded order instead of display
890 #define SLICE_FLAG_ALLOW_FIELD 0x0002 ///< allow draw_horiz_band() with field slices (MPEG-2 field pics)
891 #define SLICE_FLAG_ALLOW_PLANE 0x0004 ///< allow draw_horiz_band() with 1 component at a time (SVQ1)
892 
893  /**
894  * macroblock decision mode
895  * - encoding: Set by user.
896  * - decoding: unused
897  */
899 #define FF_MB_DECISION_SIMPLE 0 ///< uses mb_cmp
900 #define FF_MB_DECISION_BITS 1 ///< chooses the one which needs the fewest bits
901 #define FF_MB_DECISION_RD 2 ///< rate distortion
902 
903  /**
904  * custom intra quantization matrix
905  * Must be allocated with the av_malloc() family of functions, and will be freed in
906  * avcodec_free_context().
907  * - encoding: Set/allocated by user, freed by libavcodec. Can be NULL.
908  * - decoding: Set/allocated/freed by libavcodec.
909  */
910  uint16_t *intra_matrix;
911 
912  /**
913  * custom inter quantization matrix
914  * Must be allocated with the av_malloc() family of functions, and will be freed in
915  * avcodec_free_context().
916  * - encoding: Set/allocated by user, freed by libavcodec. Can be NULL.
917  * - decoding: Set/allocated/freed by libavcodec.
918  */
919  uint16_t *inter_matrix;
920 
921  /**
922  * precision of the intra DC coefficient - 8
923  * - encoding: Set by user.
924  * - decoding: Set by libavcodec
925  */
927 
928  /**
929  * Number of macroblock rows at the top which are skipped.
930  * - encoding: unused
931  * - decoding: Set by user.
932  */
933  int skip_top;
934 
935  /**
936  * Number of macroblock rows at the bottom which are skipped.
937  * - encoding: unused
938  * - decoding: Set by user.
939  */
941 
942  /**
943  * minimum MB Lagrange multiplier
944  * - encoding: Set by user.
945  * - decoding: unused
946  */
947  int mb_lmin;
948 
949  /**
950  * maximum MB Lagrange multiplier
951  * - encoding: Set by user.
952  * - decoding: unused
953  */
954  int mb_lmax;
955 
956  /**
957  * - encoding: Set by user.
958  * - decoding: unused
959  */
961 
962  /**
963  * minimum GOP size
964  * - encoding: Set by user.
965  * - decoding: unused
966  */
968 
969  /**
970  * number of reference frames
971  * - encoding: Set by user.
972  * - decoding: Set by lavc.
973  */
974  int refs;
975 
976  /**
977  * Note: Value depends upon the compare function used for fullpel ME.
978  * - encoding: Set by user.
979  * - decoding: unused
980  */
982 
983  /**
984  * Chromaticity coordinates of the source primaries.
985  * - encoding: Set by user
986  * - decoding: Set by libavcodec
987  */
989 
990  /**
991  * Color Transfer Characteristic.
992  * - encoding: Set by user
993  * - decoding: Set by libavcodec
994  */
996 
997  /**
998  * YUV colorspace type.
999  * - encoding: Set by user
1000  * - decoding: Set by libavcodec
1001  */
1002  enum AVColorSpace colorspace;
1003 
1004  /**
1005  * MPEG vs JPEG YUV range.
1006  * - encoding: Set by user
1007  * - decoding: Set by libavcodec
1008  */
1010 
1011  /**
1012  * This defines the location of chroma samples.
1013  * - encoding: Set by user
1014  * - decoding: Set by libavcodec
1015  */
1017 
1018  /**
1019  * Number of slices.
1020  * Indicates number of picture subdivisions. Used for parallelized
1021  * decoding.
1022  * - encoding: Set by user
1023  * - decoding: unused
1024  */
1025  int slices;
1026 
1027  /** Field order
1028  * - encoding: set by libavcodec
1029  * - decoding: Set by user.
1030  */
1032 
1033  /* audio only */
1034  int sample_rate; ///< samples per second
1035 
1036 #if FF_API_OLD_CHANNEL_LAYOUT
1037  /**
1038  * number of audio channels
1039  * @deprecated use ch_layout.nb_channels
1040  */
1043 #endif
1044 
1045  /**
1046  * audio sample format
1047  * - encoding: Set by user.
1048  * - decoding: Set by libavcodec.
1049  */
1050  enum AVSampleFormat sample_fmt; ///< sample format
1051 
1052  /* The following data should not be initialized. */
1053  /**
1054  * Number of samples per channel in an audio frame.
1055  *
1056  * - encoding: set by libavcodec in avcodec_open2(). Each submitted frame
1057  * except the last must contain exactly frame_size samples per channel.
1058  * May be 0 when the codec has AV_CODEC_CAP_VARIABLE_FRAME_SIZE set, then the
1059  * frame size is not restricted.
1060  * - decoding: may be set by some decoders to indicate constant frame size
1061  */
1063 
1064 #if FF_API_AVCTX_FRAME_NUMBER
1065  /**
1066  * Frame counter, set by libavcodec.
1067  *
1068  * - decoding: total number of frames returned from the decoder so far.
1069  * - encoding: total number of frames passed to the encoder so far.
1070  *
1071  * @note the counter is not incremented if encoding/decoding resulted in
1072  * an error.
1073  * @deprecated use frame_num instead
1074  */
1077 #endif
1078 
1079  /**
1080  * number of bytes per packet if constant and known or 0
1081  * Used by some WAV based audio codecs.
1082  */
1084 
1085  /**
1086  * Audio cutoff bandwidth (0 means "automatic")
1087  * - encoding: Set by user.
1088  * - decoding: unused
1089  */
1090  int cutoff;
1091 
1092 #if FF_API_OLD_CHANNEL_LAYOUT
1093  /**
1094  * Audio channel layout.
1095  * - encoding: set by user.
1096  * - decoding: set by user, may be overwritten by libavcodec.
1097  * @deprecated use ch_layout
1098  */
1100  uint64_t channel_layout;
1101 
1102  /**
1103  * Request decoder to use this channel layout if it can (0 for default)
1104  * - encoding: unused
1105  * - decoding: Set by user.
1106  * @deprecated use "downmix" codec private option
1107  */
1110 #endif
1111 
1112  /**
1113  * Type of service that the audio stream conveys.
1114  * - encoding: Set by user.
1115  * - decoding: Set by libavcodec.
1116  */
1118 
1119  /**
1120  * desired sample format
1121  * - encoding: Not used.
1122  * - decoding: Set by user.
1123  * Decoder will decode to this format if it can.
1124  */
1126 
1127  /**
1128  * This callback is called at the beginning of each frame to get data
1129  * buffer(s) for it. There may be one contiguous buffer for all the data or
1130  * there may be a buffer per each data plane or anything in between. What
1131  * this means is, you may set however many entries in buf[] you feel necessary.
1132  * Each buffer must be reference-counted using the AVBuffer API (see description
1133  * of buf[] below).
1134  *
1135  * The following fields will be set in the frame before this callback is
1136  * called:
1137  * - format
1138  * - width, height (video only)
1139  * - sample_rate, channel_layout, nb_samples (audio only)
1140  * Their values may differ from the corresponding values in
1141  * AVCodecContext. This callback must use the frame values, not the codec
1142  * context values, to calculate the required buffer size.
1143  *
1144  * This callback must fill the following fields in the frame:
1145  * - data[]
1146  * - linesize[]
1147  * - extended_data:
1148  * * if the data is planar audio with more than 8 channels, then this
1149  * callback must allocate and fill extended_data to contain all pointers
1150  * to all data planes. data[] must hold as many pointers as it can.
1151  * extended_data must be allocated with av_malloc() and will be freed in
1152  * av_frame_unref().
1153  * * otherwise extended_data must point to data
1154  * - buf[] must contain one or more pointers to AVBufferRef structures. Each of
1155  * the frame's data and extended_data pointers must be contained in these. That
1156  * is, one AVBufferRef for each allocated chunk of memory, not necessarily one
1157  * AVBufferRef per data[] entry. See: av_buffer_create(), av_buffer_alloc(),
1158  * and av_buffer_ref().
1159  * - extended_buf and nb_extended_buf must be allocated with av_malloc() by
1160  * this callback and filled with the extra buffers if there are more
1161  * buffers than buf[] can hold. extended_buf will be freed in
1162  * av_frame_unref().
1163  *
1164  * If AV_CODEC_CAP_DR1 is not set then get_buffer2() must call
1165  * avcodec_default_get_buffer2() instead of providing buffers allocated by
1166  * some other means.
1167  *
1168  * Each data plane must be aligned to the maximum required by the target
1169  * CPU.
1170  *
1171  * @see avcodec_default_get_buffer2()
1172  *
1173  * Video:
1174  *
1175  * If AV_GET_BUFFER_FLAG_REF is set in flags then the frame may be reused
1176  * (read and/or written to if it is writable) later by libavcodec.
1177  *
1178  * avcodec_align_dimensions2() should be used to find the required width and
1179  * height, as they normally need to be rounded up to the next multiple of 16.
1180  *
1181  * Some decoders do not support linesizes changing between frames.
1182  *
1183  * If frame multithreading is used, this callback may be called from a
1184  * different thread, but not from more than one at once. Does not need to be
1185  * reentrant.
1186  *
1187  * @see avcodec_align_dimensions2()
1188  *
1189  * Audio:
1190  *
1191  * Decoders request a buffer of a particular size by setting
1192  * AVFrame.nb_samples prior to calling get_buffer2(). The decoder may,
1193  * however, utilize only part of the buffer by setting AVFrame.nb_samples
1194  * to a smaller value in the output frame.
1195  *
1196  * As a convenience, av_samples_get_buffer_size() and
1197  * av_samples_fill_arrays() in libavutil may be used by custom get_buffer2()
1198  * functions to find the required data size and to fill data pointers and
1199  * linesize. In AVFrame.linesize, only linesize[0] may be set for audio
1200  * since all planes must be the same size.
1201  *
1202  * @see av_samples_get_buffer_size(), av_samples_fill_arrays()
1203  *
1204  * - encoding: unused
1205  * - decoding: Set by libavcodec, user can override.
1206  */
1207  int (*get_buffer2)(struct AVCodecContext *s, AVFrame *frame, int flags);
1208 
1209  /* - encoding parameters */
1210  float qcompress; ///< amount of qscale change between easy & hard scenes (0.0-1.0)
1211  float qblur; ///< amount of qscale smoothing over time (0.0-1.0)
1212 
1213  /**
1214  * minimum quantizer
1215  * - encoding: Set by user.
1216  * - decoding: unused
1217  */
1218  int qmin;
1219 
1220  /**
1221  * maximum quantizer
1222  * - encoding: Set by user.
1223  * - decoding: unused
1224  */
1225  int qmax;
1226 
1227  /**
1228  * maximum quantizer difference between frames
1229  * - encoding: Set by user.
1230  * - decoding: unused
1231  */
1233 
1234  /**
1235  * decoder bitstream buffer size
1236  * - encoding: Set by user.
1237  * - decoding: unused
1238  */
1240 
1241  /**
1242  * ratecontrol override, see RcOverride
1243  * - encoding: Allocated/set/freed by user.
1244  * - decoding: unused
1245  */
1248 
1249  /**
1250  * maximum bitrate
1251  * - encoding: Set by user.
1252  * - decoding: Set by user, may be overwritten by libavcodec.
1253  */
1254  int64_t rc_max_rate;
1255 
1256  /**
1257  * minimum bitrate
1258  * - encoding: Set by user.
1259  * - decoding: unused
1260  */
1261  int64_t rc_min_rate;
1262 
1263  /**
1264  * Ratecontrol attempt to use, at maximum, <value> of what can be used without an underflow.
1265  * - encoding: Set by user.
1266  * - decoding: unused.
1267  */
1269 
1270  /**
1271  * Ratecontrol attempt to use, at least, <value> times the amount needed to prevent a vbv overflow.
1272  * - encoding: Set by user.
1273  * - decoding: unused.
1274  */
1276 
1277  /**
1278  * Number of bits which should be loaded into the rc buffer before decoding starts.
1279  * - encoding: Set by user.
1280  * - decoding: unused
1281  */
1283 
1284  /**
1285  * trellis RD quantization
1286  * - encoding: Set by user.
1287  * - decoding: unused
1288  */
1289  int trellis;
1290 
1291  /**
1292  * pass1 encoding statistics output buffer
1293  * - encoding: Set by libavcodec.
1294  * - decoding: unused
1295  */
1296  char *stats_out;
1297 
1298  /**
1299  * pass2 encoding statistics input buffer
1300  * Concatenated stuff from stats_out of pass1 should be placed here.
1301  * - encoding: Allocated/set/freed by user.
1302  * - decoding: unused
1303  */
1304  char *stats_in;
1305 
1306  /**
1307  * Work around bugs in encoders which sometimes cannot be detected automatically.
1308  * - encoding: Set by user
1309  * - decoding: Set by user
1310  */
1312 #define FF_BUG_AUTODETECT 1 ///< autodetection
1313 #define FF_BUG_XVID_ILACE 4
1314 #define FF_BUG_UMP4 8
1315 #define FF_BUG_NO_PADDING 16
1316 #define FF_BUG_AMV 32
1317 #define FF_BUG_QPEL_CHROMA 64
1318 #define FF_BUG_STD_QPEL 128
1319 #define FF_BUG_QPEL_CHROMA2 256
1320 #define FF_BUG_DIRECT_BLOCKSIZE 512
1321 #define FF_BUG_EDGE 1024
1322 #define FF_BUG_HPEL_CHROMA 2048
1323 #define FF_BUG_DC_CLIP 4096
1324 #define FF_BUG_MS 8192 ///< Work around various bugs in Microsoft's broken decoders.
1325 #define FF_BUG_TRUNCATED 16384
1326 #define FF_BUG_IEDGE 32768
1327 
1328  /**
1329  * strictly follow the standard (MPEG-4, ...).
1330  * - encoding: Set by user.
1331  * - decoding: Set by user.
1332  * Setting this to STRICT or higher means the encoder and decoder will
1333  * generally do stupid things, whereas setting it to unofficial or lower
1334  * will mean the encoder might produce output that is not supported by all
1335  * spec-compliant decoders. Decoders don't differentiate between normal,
1336  * unofficial and experimental (that is, they always try to decode things
1337  * when they can) unless they are explicitly asked to behave stupidly
1338  * (=strictly conform to the specs)
1339  * This may only be set to one of the FF_COMPLIANCE_* values in defs.h.
1340  */
1342 
1343  /**
1344  * error concealment flags
1345  * - encoding: unused
1346  * - decoding: Set by user.
1347  */
1349 #define FF_EC_GUESS_MVS 1
1350 #define FF_EC_DEBLOCK 2
1351 #define FF_EC_FAVOR_INTER 256
1352 
1353  /**
1354  * debug
1355  * - encoding: Set by user.
1356  * - decoding: Set by user.
1357  */
1358  int debug;
1359 #define FF_DEBUG_PICT_INFO 1
1360 #define FF_DEBUG_RC 2
1361 #define FF_DEBUG_BITSTREAM 4
1362 #define FF_DEBUG_MB_TYPE 8
1363 #define FF_DEBUG_QP 16
1364 #define FF_DEBUG_DCT_COEFF 0x00000040
1365 #define FF_DEBUG_SKIP 0x00000080
1366 #define FF_DEBUG_STARTCODE 0x00000100
1367 #define FF_DEBUG_ER 0x00000400
1368 #define FF_DEBUG_MMCO 0x00000800
1369 #define FF_DEBUG_BUGS 0x00001000
1370 #define FF_DEBUG_BUFFERS 0x00008000
1371 #define FF_DEBUG_THREADS 0x00010000
1372 #define FF_DEBUG_GREEN_MD 0x00800000
1373 #define FF_DEBUG_NOMC 0x01000000
1374 
1375  /**
1376  * Error recognition; may misdetect some more or less valid parts as errors.
1377  * This is a bitfield of the AV_EF_* values defined in defs.h.
1378  *
1379  * - encoding: Set by user.
1380  * - decoding: Set by user.
1381  */
1383 
1384 #if FF_API_REORDERED_OPAQUE
1385  /**
1386  * opaque 64-bit number (generally a PTS) that will be reordered and
1387  * output in AVFrame.reordered_opaque
1388  * - encoding: Set by libavcodec to the reordered_opaque of the input
1389  * frame corresponding to the last returned packet. Only
1390  * supported by encoders with the
1391  * AV_CODEC_CAP_ENCODER_REORDERED_OPAQUE capability.
1392  * - decoding: Set by user.
1393  *
1394  * @deprecated Use AV_CODEC_FLAG_COPY_OPAQUE instead
1395  */
1398 #endif
1399 
1400  /**
1401  * Hardware accelerator in use
1402  * - encoding: unused.
1403  * - decoding: Set by libavcodec
1404  */
1405  const struct AVHWAccel *hwaccel;
1406 
1407  /**
1408  * Legacy hardware accelerator context.
1409  *
1410  * For some hardware acceleration methods, the caller may use this field to
1411  * signal hwaccel-specific data to the codec. The struct pointed to by this
1412  * pointer is hwaccel-dependent and defined in the respective header. Please
1413  * refer to the FFmpeg HW accelerator documentation to know how to fill
1414  * this.
1415  *
1416  * In most cases this field is optional - the necessary information may also
1417  * be provided to libavcodec through @ref hw_frames_ctx or @ref
1418  * hw_device_ctx (see avcodec_get_hw_config()). However, in some cases it
1419  * may be the only method of signalling some (optional) information.
1420  *
1421  * The struct and its contents are owned by the caller.
1422  *
1423  * - encoding: May be set by the caller before avcodec_open2(). Must remain
1424  * valid until avcodec_free_context().
1425  * - decoding: May be set by the caller in the get_format() callback.
1426  * Must remain valid until the next get_format() call,
1427  * or avcodec_free_context() (whichever comes first).
1428  */
1430 
1431  /**
1432  * error
1433  * - encoding: Set by libavcodec if flags & AV_CODEC_FLAG_PSNR.
1434  * - decoding: unused
1435  */
1437 
1438  /**
1439  * DCT algorithm, see FF_DCT_* below
1440  * - encoding: Set by user.
1441  * - decoding: unused
1442  */
1444 #define FF_DCT_AUTO 0
1445 #define FF_DCT_FASTINT 1
1446 #define FF_DCT_INT 2
1447 #define FF_DCT_MMX 3
1448 #define FF_DCT_ALTIVEC 5
1449 #define FF_DCT_FAAN 6
1450 
1451  /**
1452  * IDCT algorithm, see FF_IDCT_* below.
1453  * - encoding: Set by user.
1454  * - decoding: Set by user.
1455  */
1457 #define FF_IDCT_AUTO 0
1458 #define FF_IDCT_INT 1
1459 #define FF_IDCT_SIMPLE 2
1460 #define FF_IDCT_SIMPLEMMX 3
1461 #define FF_IDCT_ARM 7
1462 #define FF_IDCT_ALTIVEC 8
1463 #define FF_IDCT_SIMPLEARM 10
1464 #define FF_IDCT_XVID 14
1465 #define FF_IDCT_SIMPLEARMV5TE 16
1466 #define FF_IDCT_SIMPLEARMV6 17
1467 #define FF_IDCT_FAAN 20
1468 #define FF_IDCT_SIMPLENEON 22
1469 #if FF_API_IDCT_NONE
1470 // formerly used by xvmc
1471 #define FF_IDCT_NONE 24
1472 #endif
1473 #define FF_IDCT_SIMPLEAUTO 128
1474 
1475  /**
1476  * bits per sample/pixel from the demuxer (needed for huffyuv).
1477  * - encoding: Set by libavcodec.
1478  * - decoding: Set by user.
1479  */
1481 
1482  /**
1483  * Bits per sample/pixel of internal libavcodec pixel/sample format.
1484  * - encoding: set by user.
1485  * - decoding: set by libavcodec.
1486  */
1488 
1489  /**
1490  * low resolution decoding, 1-> 1/2 size, 2->1/4 size
1491  * - encoding: unused
1492  * - decoding: Set by user.
1493  */
1494  int lowres;
1495 
1496  /**
1497  * thread count
1498  * is used to decide how many independent tasks should be passed to execute()
1499  * - encoding: Set by user.
1500  * - decoding: Set by user.
1501  */
1503 
1504  /**
1505  * Which multithreading methods to use.
1506  * Use of FF_THREAD_FRAME will increase decoding delay by one frame per thread,
1507  * so clients which cannot provide future frames should not use it.
1508  *
1509  * - encoding: Set by user, otherwise the default is used.
1510  * - decoding: Set by user, otherwise the default is used.
1511  */
1513 #define FF_THREAD_FRAME 1 ///< Decode more than one frame at once
1514 #define FF_THREAD_SLICE 2 ///< Decode more than one part of a single frame at once
1515 
1516  /**
1517  * Which multithreading methods are in use by the codec.
1518  * - encoding: Set by libavcodec.
1519  * - decoding: Set by libavcodec.
1520  */
1522 
1523  /**
1524  * The codec may call this to execute several independent things.
1525  * It will return only after finishing all tasks.
1526  * The user may replace this with some multithreaded implementation,
1527  * the default implementation will execute the parts serially.
1528  * @param count the number of things to execute
1529  * - encoding: Set by libavcodec, user can override.
1530  * - decoding: Set by libavcodec, user can override.
1531  */
1532  int (*execute)(struct AVCodecContext *c, int (*func)(struct AVCodecContext *c2, void *arg), void *arg2, int *ret, int count, int size);
1533 
1534  /**
1535  * The codec may call this to execute several independent things.
1536  * It will return only after finishing all tasks.
1537  * The user may replace this with some multithreaded implementation,
1538  * the default implementation will execute the parts serially.
1539  * @param c context passed also to func
1540  * @param count the number of things to execute
1541  * @param arg2 argument passed unchanged to func
1542  * @param ret return values of executed functions, must have space for "count" values. May be NULL.
1543  * @param func function that will be called count times, with jobnr from 0 to count-1.
1544  * threadnr will be in the range 0 to c->thread_count-1 < MAX_THREADS and so that no
1545  * two instances of func executing at the same time will have the same threadnr.
1546  * @return always 0 currently, but code should handle a future improvement where when any call to func
1547  * returns < 0 no further calls to func may be done and < 0 is returned.
1548  * - encoding: Set by libavcodec, user can override.
1549  * - decoding: Set by libavcodec, user can override.
1550  */
1551  int (*execute2)(struct AVCodecContext *c, int (*func)(struct AVCodecContext *c2, void *arg, int jobnr, int threadnr), void *arg2, int *ret, int count);
1552 
1553  /**
1554  * noise vs. sse weight for the nsse comparison function
1555  * - encoding: Set by user.
1556  * - decoding: unused
1557  */
1559 
1560  /**
1561  * profile
1562  * - encoding: Set by user.
1563  * - decoding: Set by libavcodec.
1564  */
1565  int profile;
1566 #define FF_PROFILE_UNKNOWN -99
1567 #define FF_PROFILE_RESERVED -100
1568 
1569 #define FF_PROFILE_AAC_MAIN 0
1570 #define FF_PROFILE_AAC_LOW 1
1571 #define FF_PROFILE_AAC_SSR 2
1572 #define FF_PROFILE_AAC_LTP 3
1573 #define FF_PROFILE_AAC_HE 4
1574 #define FF_PROFILE_AAC_HE_V2 28
1575 #define FF_PROFILE_AAC_LD 22
1576 #define FF_PROFILE_AAC_ELD 38
1577 #define FF_PROFILE_MPEG2_AAC_LOW 128
1578 #define FF_PROFILE_MPEG2_AAC_HE 131
1579 
1580 #define FF_PROFILE_DNXHD 0
1581 #define FF_PROFILE_DNXHR_LB 1
1582 #define FF_PROFILE_DNXHR_SQ 2
1583 #define FF_PROFILE_DNXHR_HQ 3
1584 #define FF_PROFILE_DNXHR_HQX 4
1585 #define FF_PROFILE_DNXHR_444 5
1586 
1587 #define FF_PROFILE_DTS 20
1588 #define FF_PROFILE_DTS_ES 30
1589 #define FF_PROFILE_DTS_96_24 40
1590 #define FF_PROFILE_DTS_HD_HRA 50
1591 #define FF_PROFILE_DTS_HD_MA 60
1592 #define FF_PROFILE_DTS_EXPRESS 70
1593 
1594 #define FF_PROFILE_MPEG2_422 0
1595 #define FF_PROFILE_MPEG2_HIGH 1
1596 #define FF_PROFILE_MPEG2_SS 2
1597 #define FF_PROFILE_MPEG2_SNR_SCALABLE 3
1598 #define FF_PROFILE_MPEG2_MAIN 4
1599 #define FF_PROFILE_MPEG2_SIMPLE 5
1600 
1601 #define FF_PROFILE_H264_CONSTRAINED (1<<9) // 8+1; constraint_set1_flag
1602 #define FF_PROFILE_H264_INTRA (1<<11) // 8+3; constraint_set3_flag
1603 
1604 #define FF_PROFILE_H264_BASELINE 66
1605 #define FF_PROFILE_H264_CONSTRAINED_BASELINE (66|FF_PROFILE_H264_CONSTRAINED)
1606 #define FF_PROFILE_H264_MAIN 77
1607 #define FF_PROFILE_H264_EXTENDED 88
1608 #define FF_PROFILE_H264_HIGH 100
1609 #define FF_PROFILE_H264_HIGH_10 110
1610 #define FF_PROFILE_H264_HIGH_10_INTRA (110|FF_PROFILE_H264_INTRA)
1611 #define FF_PROFILE_H264_MULTIVIEW_HIGH 118
1612 #define FF_PROFILE_H264_HIGH_422 122
1613 #define FF_PROFILE_H264_HIGH_422_INTRA (122|FF_PROFILE_H264_INTRA)
1614 #define FF_PROFILE_H264_STEREO_HIGH 128
1615 #define FF_PROFILE_H264_HIGH_444 144
1616 #define FF_PROFILE_H264_HIGH_444_PREDICTIVE 244
1617 #define FF_PROFILE_H264_HIGH_444_INTRA (244|FF_PROFILE_H264_INTRA)
1618 #define FF_PROFILE_H264_CAVLC_444 44
1619 
1620 #define FF_PROFILE_VC1_SIMPLE 0
1621 #define FF_PROFILE_VC1_MAIN 1
1622 #define FF_PROFILE_VC1_COMPLEX 2
1623 #define FF_PROFILE_VC1_ADVANCED 3
1624 
1625 #define FF_PROFILE_MPEG4_SIMPLE 0
1626 #define FF_PROFILE_MPEG4_SIMPLE_SCALABLE 1
1627 #define FF_PROFILE_MPEG4_CORE 2
1628 #define FF_PROFILE_MPEG4_MAIN 3
1629 #define FF_PROFILE_MPEG4_N_BIT 4
1630 #define FF_PROFILE_MPEG4_SCALABLE_TEXTURE 5
1631 #define FF_PROFILE_MPEG4_SIMPLE_FACE_ANIMATION 6
1632 #define FF_PROFILE_MPEG4_BASIC_ANIMATED_TEXTURE 7
1633 #define FF_PROFILE_MPEG4_HYBRID 8
1634 #define FF_PROFILE_MPEG4_ADVANCED_REAL_TIME 9
1635 #define FF_PROFILE_MPEG4_CORE_SCALABLE 10
1636 #define FF_PROFILE_MPEG4_ADVANCED_CODING 11
1637 #define FF_PROFILE_MPEG4_ADVANCED_CORE 12
1638 #define FF_PROFILE_MPEG4_ADVANCED_SCALABLE_TEXTURE 13
1639 #define FF_PROFILE_MPEG4_SIMPLE_STUDIO 14
1640 #define FF_PROFILE_MPEG4_ADVANCED_SIMPLE 15
1641 
1642 #define FF_PROFILE_JPEG2000_CSTREAM_RESTRICTION_0 1
1643 #define FF_PROFILE_JPEG2000_CSTREAM_RESTRICTION_1 2
1644 #define FF_PROFILE_JPEG2000_CSTREAM_NO_RESTRICTION 32768
1645 #define FF_PROFILE_JPEG2000_DCINEMA_2K 3
1646 #define FF_PROFILE_JPEG2000_DCINEMA_4K 4
1647 
1648 #define FF_PROFILE_VP9_0 0
1649 #define FF_PROFILE_VP9_1 1
1650 #define FF_PROFILE_VP9_2 2
1651 #define FF_PROFILE_VP9_3 3
1652 
1653 #define FF_PROFILE_HEVC_MAIN 1
1654 #define FF_PROFILE_HEVC_MAIN_10 2
1655 #define FF_PROFILE_HEVC_MAIN_STILL_PICTURE 3
1656 #define FF_PROFILE_HEVC_REXT 4
1657 
1658 #define FF_PROFILE_VVC_MAIN_10 1
1659 #define FF_PROFILE_VVC_MAIN_10_444 33
1660 
1661 #define FF_PROFILE_AV1_MAIN 0
1662 #define FF_PROFILE_AV1_HIGH 1
1663 #define FF_PROFILE_AV1_PROFESSIONAL 2
1664 
1665 #define FF_PROFILE_MJPEG_HUFFMAN_BASELINE_DCT 0xc0
1666 #define FF_PROFILE_MJPEG_HUFFMAN_EXTENDED_SEQUENTIAL_DCT 0xc1
1667 #define FF_PROFILE_MJPEG_HUFFMAN_PROGRESSIVE_DCT 0xc2
1668 #define FF_PROFILE_MJPEG_HUFFMAN_LOSSLESS 0xc3
1669 #define FF_PROFILE_MJPEG_JPEG_LS 0xf7
1670 
1671 #define FF_PROFILE_SBC_MSBC 1
1672 
1673 #define FF_PROFILE_PRORES_PROXY 0
1674 #define FF_PROFILE_PRORES_LT 1
1675 #define FF_PROFILE_PRORES_STANDARD 2
1676 #define FF_PROFILE_PRORES_HQ 3
1677 #define FF_PROFILE_PRORES_4444 4
1678 #define FF_PROFILE_PRORES_XQ 5
1679 
1680 #define FF_PROFILE_ARIB_PROFILE_A 0
1681 #define FF_PROFILE_ARIB_PROFILE_C 1
1682 
1683 #define FF_PROFILE_KLVA_SYNC 0
1684 #define FF_PROFILE_KLVA_ASYNC 1
1685 
1686  /**
1687  * level
1688  * - encoding: Set by user.
1689  * - decoding: Set by libavcodec.
1690  */
1691  int level;
1692 #define FF_LEVEL_UNKNOWN -99
1693 
1694  /**
1695  * Skip loop filtering for selected frames.
1696  * - encoding: unused
1697  * - decoding: Set by user.
1698  */
1700 
1701  /**
1702  * Skip IDCT/dequantization for selected frames.
1703  * - encoding: unused
1704  * - decoding: Set by user.
1705  */
1706  enum AVDiscard skip_idct;
1707 
1708  /**
1709  * Skip decoding for selected frames.
1710  * - encoding: unused
1711  * - decoding: Set by user.
1712  */
1713  enum AVDiscard skip_frame;
1714 
1715  /**
1716  * Header containing style information for text subtitles.
1717  * For SUBTITLE_ASS subtitle type, it should contain the whole ASS
1718  * [Script Info] and [V4+ Styles] section, plus the [Events] line and
1719  * the Format line following. It shouldn't include any Dialogue line.
1720  * - encoding: Set/allocated/freed by user (before avcodec_open2())
1721  * - decoding: Set/allocated/freed by libavcodec (by avcodec_open2())
1722  */
1725 
1726  /**
1727  * Audio only. The number of "priming" samples (padding) inserted by the
1728  * encoder at the beginning of the audio. I.e. this number of leading
1729  * decoded samples must be discarded by the caller to get the original audio
1730  * without leading padding.
1731  *
1732  * - decoding: unused
1733  * - encoding: Set by libavcodec. The timestamps on the output packets are
1734  * adjusted by the encoder so that they always refer to the
1735  * first sample of the data actually contained in the packet,
1736  * including any added padding. E.g. if the timebase is
1737  * 1/samplerate and the timestamp of the first input sample is
1738  * 0, the timestamp of the first output packet will be
1739  * -initial_padding.
1740  */
1742 
1743  /**
1744  * - decoding: For codecs that store a framerate value in the compressed
1745  * bitstream, the decoder may export it here. { 0, 1} when
1746  * unknown.
1747  * - encoding: May be used to signal the framerate of CFR content to an
1748  * encoder.
1749  */
1751 
1752  /**
1753  * Nominal unaccelerated pixel format, see AV_PIX_FMT_xxx.
1754  * - encoding: unused.
1755  * - decoding: Set by libavcodec before calling get_format()
1756  */
1758 
1759  /**
1760  * Timebase in which pkt_dts/pts and AVPacket.dts/pts are.
1761  * - encoding unused.
1762  * - decoding set by user.
1763  */
1765 
1766  /**
1767  * AVCodecDescriptor
1768  * - encoding: unused.
1769  * - decoding: set by libavcodec.
1770  */
1772 
1773  /**
1774  * Current statistics for PTS correction.
1775  * - decoding: maintained and used by libavcodec, not intended to be used by user apps
1776  * - encoding: unused
1777  */
1778  int64_t pts_correction_num_faulty_pts; /// Number of incorrect PTS values so far
1779  int64_t pts_correction_num_faulty_dts; /// Number of incorrect DTS values so far
1780  int64_t pts_correction_last_pts; /// PTS of the last frame
1781  int64_t pts_correction_last_dts; /// DTS of the last frame
1782 
1783  /**
1784  * Character encoding of the input subtitles file.
1785  * - decoding: set by user
1786  * - encoding: unused
1787  */
1789 
1790  /**
1791  * Subtitles character encoding mode. Formats or codecs might be adjusting
1792  * this setting (if they are doing the conversion themselves for instance).
1793  * - decoding: set by libavcodec
1794  * - encoding: unused
1795  */
1797 #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)
1798 #define FF_SUB_CHARENC_MODE_AUTOMATIC 0 ///< libavcodec will select the mode itself
1799 #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
1800 #define FF_SUB_CHARENC_MODE_IGNORE 2 ///< neither convert the subtitles, nor check them for valid UTF-8
1801 
1802  /**
1803  * Skip processing alpha if supported by codec.
1804  * Note that if the format uses pre-multiplied alpha (common with VP6,
1805  * and recommended due to better video quality/compression)
1806  * the image will look as if alpha-blended onto a black background.
1807  * However for formats that do not use pre-multiplied alpha
1808  * there might be serious artefacts (though e.g. libswscale currently
1809  * assumes pre-multiplied alpha anyway).
1810  *
1811  * - decoding: set by user
1812  * - encoding: unused
1813  */
1815 
1816  /**
1817  * Number of samples to skip after a discontinuity
1818  * - decoding: unused
1819  * - encoding: set by libavcodec
1820  */
1822 
1823  /**
1824  * custom intra quantization matrix
1825  * - encoding: Set by user, can be NULL.
1826  * - decoding: unused.
1827  */
1829 
1830  /**
1831  * dump format separator.
1832  * can be ", " or "\n " or anything else
1833  * - encoding: Set by user.
1834  * - decoding: Set by user.
1835  */
1836  uint8_t *dump_separator;
1837 
1838  /**
1839  * ',' separated list of allowed decoders.
1840  * If NULL then all are allowed
1841  * - encoding: unused
1842  * - decoding: set by user
1843  */
1845 
1846  /**
1847  * Properties of the stream that gets decoded
1848  * - encoding: unused
1849  * - decoding: set by libavcodec
1850  */
1851  unsigned properties;
1852 #define FF_CODEC_PROPERTY_LOSSLESS 0x00000001
1853 #define FF_CODEC_PROPERTY_CLOSED_CAPTIONS 0x00000002
1854 #define FF_CODEC_PROPERTY_FILM_GRAIN 0x00000004
1855 
1856  /**
1857  * Additional data associated with the entire coded stream.
1858  *
1859  * - decoding: unused
1860  * - encoding: may be set by libavcodec after avcodec_open2().
1861  */
1864 
1865  /**
1866  * A reference to the AVHWFramesContext describing the input (for encoding)
1867  * or output (decoding) frames. The reference is set by the caller and
1868  * afterwards owned (and freed) by libavcodec - it should never be read by
1869  * the caller after being set.
1870  *
1871  * - decoding: This field should be set by the caller from the get_format()
1872  * callback. The previous reference (if any) will always be
1873  * unreffed by libavcodec before the get_format() call.
1874  *
1875  * If the default get_buffer2() is used with a hwaccel pixel
1876  * format, then this AVHWFramesContext will be used for
1877  * allocating the frame buffers.
1878  *
1879  * - encoding: For hardware encoders configured to use a hwaccel pixel
1880  * format, this field should be set by the caller to a reference
1881  * to the AVHWFramesContext describing input frames.
1882  * AVHWFramesContext.format must be equal to
1883  * AVCodecContext.pix_fmt.
1884  *
1885  * This field should be set before avcodec_open2() is called.
1886  */
1888 
1889  /**
1890  * Audio only. The amount of padding (in samples) appended by the encoder to
1891  * the end of the audio. I.e. this number of decoded samples must be
1892  * discarded by the caller from the end of the stream to get the original
1893  * audio without any trailing padding.
1894  *
1895  * - decoding: unused
1896  * - encoding: unused
1897  */
1899 
1900  /**
1901  * The number of pixels per image to maximally accept.
1902  *
1903  * - decoding: set by user
1904  * - encoding: set by user
1905  */
1906  int64_t max_pixels;
1907 
1908  /**
1909  * A reference to the AVHWDeviceContext describing the device which will
1910  * be used by a hardware encoder/decoder. The reference is set by the
1911  * caller and afterwards owned (and freed) by libavcodec.
1912  *
1913  * This should be used if either the codec device does not require
1914  * hardware frames or any that are used are to be allocated internally by
1915  * libavcodec. If the user wishes to supply any of the frames used as
1916  * encoder input or decoder output then hw_frames_ctx should be used
1917  * instead. When hw_frames_ctx is set in get_format() for a decoder, this
1918  * field will be ignored while decoding the associated stream segment, but
1919  * may again be used on a following one after another get_format() call.
1920  *
1921  * For both encoders and decoders this field should be set before
1922  * avcodec_open2() is called and must not be written to thereafter.
1923  *
1924  * Note that some decoders may require this field to be set initially in
1925  * order to support hw_frames_ctx at all - in that case, all frames
1926  * contexts used must be created on the same device.
1927  */
1929 
1930  /**
1931  * Bit set of AV_HWACCEL_FLAG_* flags, which affect hardware accelerated
1932  * decoding (if active).
1933  * - encoding: unused
1934  * - decoding: Set by user (either before avcodec_open2(), or in the
1935  * AVCodecContext.get_format callback)
1936  */
1938 
1939  /**
1940  * Video decoding only. Certain video codecs support cropping, meaning that
1941  * only a sub-rectangle of the decoded frame is intended for display. This
1942  * option controls how cropping is handled by libavcodec.
1943  *
1944  * When set to 1 (the default), libavcodec will apply cropping internally.
1945  * I.e. it will modify the output frame width/height fields and offset the
1946  * data pointers (only by as much as possible while preserving alignment, or
1947  * by the full amount if the AV_CODEC_FLAG_UNALIGNED flag is set) so that
1948  * the frames output by the decoder refer only to the cropped area. The
1949  * crop_* fields of the output frames will be zero.
1950  *
1951  * When set to 0, the width/height fields of the output frames will be set
1952  * to the coded dimensions and the crop_* fields will describe the cropping
1953  * rectangle. Applying the cropping is left to the caller.
1954  *
1955  * @warning When hardware acceleration with opaque output frames is used,
1956  * libavcodec is unable to apply cropping from the top/left border.
1957  *
1958  * @note when this option is set to zero, the width/height fields of the
1959  * AVCodecContext and output AVFrames have different meanings. The codec
1960  * context fields store display dimensions (with the coded dimensions in
1961  * coded_width/height), while the frame fields store the coded dimensions
1962  * (with the display dimensions being determined by the crop_* fields).
1963  */
1965 
1966  /*
1967  * Video decoding only. Sets the number of extra hardware frames which
1968  * the decoder will allocate for use by the caller. This must be set
1969  * before avcodec_open2() is called.
1970  *
1971  * Some hardware decoders require all frames that they will use for
1972  * output to be defined in advance before decoding starts. For such
1973  * decoders, the hardware frame pool must therefore be of a fixed size.
1974  * The extra frames set here are on top of any number that the decoder
1975  * needs internally in order to operate normally (for example, frames
1976  * used as reference pictures).
1977  */
1979 
1980  /**
1981  * The percentage of damaged samples to discard a frame.
1982  *
1983  * - decoding: set by user
1984  * - encoding: unused
1985  */
1987 
1988  /**
1989  * The number of samples per frame to maximally accept.
1990  *
1991  * - decoding: set by user
1992  * - encoding: set by user
1993  */
1994  int64_t max_samples;
1995 
1996  /**
1997  * Bit set of AV_CODEC_EXPORT_DATA_* flags, which affects the kind of
1998  * metadata exported in frame, packet, or coded stream side data by
1999  * decoders and encoders.
2000  *
2001  * - decoding: set by user
2002  * - encoding: set by user
2003  */
2005 
2006  /**
2007  * This callback is called at the beginning of each packet to get a data
2008  * buffer for it.
2009  *
2010  * The following field will be set in the packet before this callback is
2011  * called:
2012  * - size
2013  * This callback must use the above value to calculate the required buffer size,
2014  * which must padded by at least AV_INPUT_BUFFER_PADDING_SIZE bytes.
2015  *
2016  * In some specific cases, the encoder may not use the entire buffer allocated by this
2017  * callback. This will be reflected in the size value in the packet once returned by
2018  * avcodec_receive_packet().
2019  *
2020  * This callback must fill the following fields in the packet:
2021  * - data: alignment requirements for AVPacket apply, if any. Some architectures and
2022  * encoders may benefit from having aligned data.
2023  * - buf: must contain a pointer to an AVBufferRef structure. The packet's
2024  * data pointer must be contained in it. See: av_buffer_create(), av_buffer_alloc(),
2025  * and av_buffer_ref().
2026  *
2027  * If AV_CODEC_CAP_DR1 is not set then get_encode_buffer() must call
2028  * avcodec_default_get_encode_buffer() instead of providing a buffer allocated by
2029  * some other means.
2030  *
2031  * The flags field may contain a combination of AV_GET_ENCODE_BUFFER_FLAG_ flags.
2032  * They may be used for example to hint what use the buffer may get after being
2033  * created.
2034  * Implementations of this callback may ignore flags they don't understand.
2035  * If AV_GET_ENCODE_BUFFER_FLAG_REF is set in flags then the packet may be reused
2036  * (read and/or written to if it is writable) later by libavcodec.
2037  *
2038  * This callback must be thread-safe, as when frame threading is used, it may
2039  * be called from multiple threads simultaneously.
2040  *
2041  * @see avcodec_default_get_encode_buffer()
2042  *
2043  * - encoding: Set by libavcodec, user can override.
2044  * - decoding: unused
2045  */
2047 
2048  /**
2049  * Audio channel layout.
2050  * - encoding: must be set by the caller, to one of AVCodec.ch_layouts.
2051  * - decoding: may be set by the caller if known e.g. from the container.
2052  * The decoder can then override during decoding as needed.
2053  */
2055 
2056  /**
2057  * Frame counter, set by libavcodec.
2058  *
2059  * - decoding: total number of frames returned from the decoder so far.
2060  * - encoding: total number of frames passed to the encoder so far.
2061  *
2062  * @note the counter is not incremented if encoding/decoding resulted in
2063  * an error.
2064  */
2065  int64_t frame_num;
2066 } AVCodecContext;
2067 
2068 /**
2069  * @defgroup lavc_hwaccel AVHWAccel
2070  *
2071  * @note Nothing in this structure should be accessed by the user. At some
2072  * point in future it will not be externally visible at all.
2073  *
2074  * @{
2075  */
2076 typedef struct AVHWAccel {
2077  /**
2078  * Name of the hardware accelerated codec.
2079  * The name is globally unique among encoders and among decoders (but an
2080  * encoder and a decoder can share the same name).
2081  */
2082  const char *name;
2083 
2084  /**
2085  * Type of codec implemented by the hardware accelerator.
2086  *
2087  * See AVMEDIA_TYPE_xxx
2088  */
2089  enum AVMediaType type;
2090 
2091  /**
2092  * Codec implemented by the hardware accelerator.
2093  *
2094  * See AV_CODEC_ID_xxx
2095  */
2096  enum AVCodecID id;
2097 
2098  /**
2099  * Supported pixel format.
2100  *
2101  * Only hardware accelerated formats are supported here.
2102  */
2103  enum AVPixelFormat pix_fmt;
2104 
2105  /**
2106  * Hardware accelerated codec capabilities.
2107  * see AV_HWACCEL_CODEC_CAP_*
2108  */
2110 
2111  /*****************************************************************
2112  * No fields below this line are part of the public API. They
2113  * may not be used outside of libavcodec and can be changed and
2114  * removed at will.
2115  * New public fields should be added right above.
2116  *****************************************************************
2117  */
2118 
2119  /**
2120  * Allocate a custom buffer
2121  */
2123 
2124  /**
2125  * Called at the beginning of each frame or field picture.
2126  *
2127  * Meaningful frame information (codec specific) is guaranteed to
2128  * be parsed at this point. This function is mandatory.
2129  *
2130  * Note that buf can be NULL along with buf_size set to 0.
2131  * Otherwise, this means the whole frame is available at this point.
2132  *
2133  * @param avctx the codec context
2134  * @param buf the frame data buffer base
2135  * @param buf_size the size of the frame in bytes
2136  * @return zero if successful, a negative value otherwise
2137  */
2138  int (*start_frame)(AVCodecContext *avctx, const uint8_t *buf, uint32_t buf_size);
2139 
2140  /**
2141  * Callback for parameter data (SPS/PPS/VPS etc).
2142  *
2143  * Useful for hardware decoders which keep persistent state about the
2144  * video parameters, and need to receive any changes to update that state.
2145  *
2146  * @param avctx the codec context
2147  * @param type the nal unit type
2148  * @param buf the nal unit data buffer
2149  * @param buf_size the size of the nal unit in bytes
2150  * @return zero if successful, a negative value otherwise
2151  */
2152  int (*decode_params)(AVCodecContext *avctx, int type, const uint8_t *buf, uint32_t buf_size);
2153 
2154  /**
2155  * Callback for each slice.
2156  *
2157  * Meaningful slice information (codec specific) is guaranteed to
2158  * be parsed at this point. This function is mandatory.
2159  *
2160  * @param avctx the codec context
2161  * @param buf the slice data buffer base
2162  * @param buf_size the size of the slice in bytes
2163  * @return zero if successful, a negative value otherwise
2164  */
2165  int (*decode_slice)(AVCodecContext *avctx, const uint8_t *buf, uint32_t buf_size);
2166 
2167  /**
2168  * Called at the end of each frame or field picture.
2169  *
2170  * The whole picture is parsed at this point and can now be sent
2171  * to the hardware accelerator. This function is mandatory.
2172  *
2173  * @param avctx the codec context
2174  * @return zero if successful, a negative value otherwise
2175  */
2176  int (*end_frame)(AVCodecContext *avctx);
2177 
2178  /**
2179  * Size of per-frame hardware accelerator private data.
2180  *
2181  * Private data is allocated with av_mallocz() before
2182  * AVCodecContext.get_buffer() and deallocated after
2183  * AVCodecContext.release_buffer().
2184  */
2186 
2187  /**
2188  * Initialize the hwaccel private data.
2189  *
2190  * This will be called from ff_get_format(), after hwaccel and
2191  * hwaccel_context are set and the hwaccel private data in AVCodecInternal
2192  * is allocated.
2193  */
2194  int (*init)(AVCodecContext *avctx);
2195 
2196  /**
2197  * Uninitialize the hwaccel private data.
2198  *
2199  * This will be called from get_format() or avcodec_close(), after hwaccel
2200  * and hwaccel_context are already uninitialized.
2201  */
2202  int (*uninit)(AVCodecContext *avctx);
2203 
2204  /**
2205  * Size of the private data to allocate in
2206  * AVCodecInternal.hwaccel_priv_data.
2207  */
2209 
2210  /**
2211  * Internal hwaccel capabilities.
2212  */
2214 
2215  /**
2216  * Fill the given hw_frames context with current codec parameters. Called
2217  * from get_format. Refer to avcodec_get_hw_frames_parameters() for
2218  * details.
2219  *
2220  * This CAN be called before AVHWAccel.init is called, and you must assume
2221  * that avctx->hwaccel_priv_data is invalid.
2222  */
2223  int (*frame_params)(AVCodecContext *avctx, AVBufferRef *hw_frames_ctx);
2224 } AVHWAccel;
2225 
2226 /**
2227  * HWAccel is experimental and is thus avoided in favor of non experimental
2228  * codecs
2229  */
2230 #define AV_HWACCEL_CODEC_CAP_EXPERIMENTAL 0x0200
2231 
2232 /**
2233  * Hardware acceleration should be used for decoding even if the codec level
2234  * used is unknown or higher than the maximum supported level reported by the
2235  * hardware driver.
2236  *
2237  * It's generally a good idea to pass this flag unless you have a specific
2238  * reason not to, as hardware tends to under-report supported levels.
2239  */
2240 #define AV_HWACCEL_FLAG_IGNORE_LEVEL (1 << 0)
2241 
2242 /**
2243  * Hardware acceleration can output YUV pixel formats with a different chroma
2244  * sampling than 4:2:0 and/or other than 8 bits per component.
2245  */
2246 #define AV_HWACCEL_FLAG_ALLOW_HIGH_DEPTH (1 << 1)
2247 
2248 /**
2249  * Hardware acceleration should still be attempted for decoding when the
2250  * codec profile does not match the reported capabilities of the hardware.
2251  *
2252  * For example, this can be used to try to decode baseline profile H.264
2253  * streams in hardware - it will often succeed, because many streams marked
2254  * as baseline profile actually conform to constrained baseline profile.
2255  *
2256  * @warning If the stream is actually not supported then the behaviour is
2257  * undefined, and may include returning entirely incorrect output
2258  * while indicating success.
2259  */
2260 #define AV_HWACCEL_FLAG_ALLOW_PROFILE_MISMATCH (1 << 2)
2261 
2262 /**
2263  * Some hardware decoders (namely nvdec) can either output direct decoder
2264  * surfaces, or make an on-device copy and return said copy.
2265  * There is a hard limit on how many decoder surfaces there can be, and it
2266  * cannot be accurately guessed ahead of time.
2267  * For some processing chains, this can be okay, but others will run into the
2268  * limit and in turn produce very confusing errors that require fine tuning of
2269  * more or less obscure options by the user, or in extreme cases cannot be
2270  * resolved at all without inserting an avfilter that forces a copy.
2271  *
2272  * Thus, the hwaccel will by default make a copy for safety and resilience.
2273  * If a users really wants to minimize the amount of copies, they can set this
2274  * flag and ensure their processing chain does not exhaust the surface pool.
2275  */
2276 #define AV_HWACCEL_FLAG_UNSAFE_OUTPUT (1 << 3)
2277 
2278 /**
2279  * @}
2280  */
2281 
2284 
2285  SUBTITLE_BITMAP, ///< A bitmap, pict will be set
2286 
2287  /**
2288  * Plain text, the text field must be set by the decoder and is
2289  * authoritative. ass and pict fields may contain approximations.
2290  */
2292 
2293  /**
2294  * Formatted text, the ass field must be set by the decoder and is
2295  * authoritative. pict and text fields may contain approximations.
2296  */
2298 };
2299 
2300 #define AV_SUBTITLE_FLAG_FORCED 0x00000001
2301 
2302 typedef struct AVSubtitleRect {
2303  int x; ///< top left corner of pict, undefined when pict is not set
2304  int y; ///< top left corner of pict, undefined when pict is not set
2305  int w; ///< width of pict, undefined when pict is not set
2306  int h; ///< height of pict, undefined when pict is not set
2307  int nb_colors; ///< number of colors in pict, undefined when pict is not set
2308 
2309  /**
2310  * data+linesize for the bitmap of this subtitle.
2311  * Can be set for text/ass as well once they are rendered.
2312  */
2313  uint8_t *data[4];
2314  int linesize[4];
2315 
2316  enum AVSubtitleType type;
2317 
2318  char *text; ///< 0 terminated plain UTF-8 text
2319 
2320  /**
2321  * 0 terminated ASS/SSA compatible event line.
2322  * The presentation of this is unaffected by the other values in this
2323  * struct.
2324  */
2325  char *ass;
2326 
2327  int flags;
2328 } AVSubtitleRect;
2329 
2330 typedef struct AVSubtitle {
2331  uint16_t format; /* 0 = graphics */
2332  uint32_t start_display_time; /* relative to packet pts, in ms */
2333  uint32_t end_display_time; /* relative to packet pts, in ms */
2334  unsigned num_rects;
2336  int64_t pts; ///< Same as packet pts, in AV_TIME_BASE
2337 } AVSubtitle;
2338 
2339 /**
2340  * Return the LIBAVCODEC_VERSION_INT constant.
2341  */
2342 unsigned avcodec_version(void);
2343 
2344 /**
2345  * Return the libavcodec build-time configuration.
2346  */
2347 const char *avcodec_configuration(void);
2348 
2349 /**
2350  * Return the libavcodec license.
2351  */
2352 const char *avcodec_license(void);
2353 
2354 /**
2355  * Allocate an AVCodecContext and set its fields to default values. The
2356  * resulting struct should be freed with avcodec_free_context().
2357  *
2358  * @param codec if non-NULL, allocate private data and initialize defaults
2359  * for the given codec. It is illegal to then call avcodec_open2()
2360  * with a different codec.
2361  * If NULL, then the codec-specific defaults won't be initialized,
2362  * which may result in suboptimal default settings (this is
2363  * important mainly for encoders, e.g. libx264).
2364  *
2365  * @return An AVCodecContext filled with default values or NULL on failure.
2366  */
2368 
2369 /**
2370  * Free the codec context and everything associated with it and write NULL to
2371  * the provided pointer.
2372  */
2374 
2375 /**
2376  * Get the AVClass for AVCodecContext. It can be used in combination with
2377  * AV_OPT_SEARCH_FAKE_OBJ for examining options.
2378  *
2379  * @see av_opt_find().
2380  */
2382 
2383 /**
2384  * Get the AVClass for AVSubtitleRect. It can be used in combination with
2385  * AV_OPT_SEARCH_FAKE_OBJ for examining options.
2386  *
2387  * @see av_opt_find().
2388  */
2390 
2391 /**
2392  * Fill the parameters struct based on the values from the supplied codec
2393  * context. Any allocated fields in par are freed and replaced with duplicates
2394  * of the corresponding fields in codec.
2395  *
2396  * @return >= 0 on success, a negative AVERROR code on failure
2397  */
2399  const AVCodecContext *codec);
2400 
2401 /**
2402  * Fill the codec context based on the values from the supplied codec
2403  * parameters. Any allocated fields in codec that have a corresponding field in
2404  * par are freed and replaced with duplicates of the corresponding field in par.
2405  * Fields in codec that do not have a counterpart in par are not touched.
2406  *
2407  * @return >= 0 on success, a negative AVERROR code on failure.
2408  */
2410  const AVCodecParameters *par);
2411 
2412 /**
2413  * Initialize the AVCodecContext to use the given AVCodec. Prior to using this
2414  * function the context has to be allocated with avcodec_alloc_context3().
2415  *
2416  * The functions avcodec_find_decoder_by_name(), avcodec_find_encoder_by_name(),
2417  * avcodec_find_decoder() and avcodec_find_encoder() provide an easy way for
2418  * retrieving a codec.
2419  *
2420  * @note Always call this function before using decoding routines (such as
2421  * @ref avcodec_receive_frame()).
2422  *
2423  * @code
2424  * av_dict_set(&opts, "b", "2.5M", 0);
2425  * codec = avcodec_find_decoder(AV_CODEC_ID_H264);
2426  * if (!codec)
2427  * exit(1);
2428  *
2429  * context = avcodec_alloc_context3(codec);
2430  *
2431  * if (avcodec_open2(context, codec, opts) < 0)
2432  * exit(1);
2433  * @endcode
2434  *
2435  * @param avctx The context to initialize.
2436  * @param codec The codec to open this context for. If a non-NULL codec has been
2437  * previously passed to avcodec_alloc_context3() or
2438  * for this context, then this parameter MUST be either NULL or
2439  * equal to the previously passed codec.
2440  * @param options A dictionary filled with AVCodecContext and codec-private options.
2441  * On return this object will be filled with options that were not found.
2442  *
2443  * @return zero on success, a negative value on error
2444  * @see avcodec_alloc_context3(), avcodec_find_decoder(), avcodec_find_encoder(),
2445  * av_dict_set(), av_opt_find().
2446  */
2447 int avcodec_open2(AVCodecContext *avctx, const AVCodec *codec, AVDictionary **options);
2448 
2449 /**
2450  * Close a given AVCodecContext and free all the data associated with it
2451  * (but not the AVCodecContext itself).
2452  *
2453  * Calling this function on an AVCodecContext that hasn't been opened will free
2454  * the codec-specific data allocated in avcodec_alloc_context3() with a non-NULL
2455  * codec. Subsequent calls will do nothing.
2456  *
2457  * @note Do not use this function. Use avcodec_free_context() to destroy a
2458  * codec context (either open or closed). Opening and closing a codec context
2459  * multiple times is not supported anymore -- use multiple codec contexts
2460  * instead.
2461  */
2463 
2464 /**
2465  * Free all allocated data in the given subtitle struct.
2466  *
2467  * @param sub AVSubtitle to free.
2468  */
2470 
2471 /**
2472  * @}
2473  */
2474 
2475 /**
2476  * @addtogroup lavc_decoding
2477  * @{
2478  */
2479 
2480 /**
2481  * The default callback for AVCodecContext.get_buffer2(). It is made public so
2482  * it can be called by custom get_buffer2() implementations for decoders without
2483  * AV_CODEC_CAP_DR1 set.
2484  */
2486 
2487 /**
2488  * The default callback for AVCodecContext.get_encode_buffer(). It is made public so
2489  * it can be called by custom get_encode_buffer() implementations for encoders without
2490  * AV_CODEC_CAP_DR1 set.
2491  */
2493 
2494 /**
2495  * Modify width and height values so that they will result in a memory
2496  * buffer that is acceptable for the codec if you do not use any horizontal
2497  * padding.
2498  *
2499  * May only be used if a codec with AV_CODEC_CAP_DR1 has been opened.
2500  */
2502 
2503 /**
2504  * Modify width and height values so that they will result in a memory
2505  * buffer that is acceptable for the codec if you also ensure that all
2506  * line sizes are a multiple of the respective linesize_align[i].
2507  *
2508  * May only be used if a codec with AV_CODEC_CAP_DR1 has been opened.
2509  */
2511  int linesize_align[AV_NUM_DATA_POINTERS]);
2512 
2513 #ifdef FF_API_AVCODEC_CHROMA_POS
2514 /**
2515  * Converts AVChromaLocation to swscale x/y chroma position.
2516  *
2517  * The positions represent the chroma (0,0) position in a coordinates system
2518  * with luma (0,0) representing the origin and luma(1,1) representing 256,256
2519  *
2520  * @param xpos horizontal chroma sample position
2521  * @param ypos vertical chroma sample position
2522  * @deprecated Use av_chroma_location_enum_to_pos() instead.
2523  */
2525 int avcodec_enum_to_chroma_pos(int *xpos, int *ypos, enum AVChromaLocation pos);
2526 
2527 /**
2528  * Converts swscale x/y chroma position to AVChromaLocation.
2529  *
2530  * The positions represent the chroma (0,0) position in a coordinates system
2531  * with luma (0,0) representing the origin and luma(1,1) representing 256,256
2532  *
2533  * @param xpos horizontal chroma sample position
2534  * @param ypos vertical chroma sample position
2535  * @deprecated Use av_chroma_location_pos_to_enum() instead.
2536  */
2538 enum AVChromaLocation avcodec_chroma_pos_to_enum(int xpos, int ypos);
2539 #endif
2540 
2541 /**
2542  * Decode a subtitle message.
2543  * Return a negative value on error, otherwise return the number of bytes used.
2544  * If no subtitle could be decompressed, got_sub_ptr is zero.
2545  * Otherwise, the subtitle is stored in *sub.
2546  * Note that AV_CODEC_CAP_DR1 is not available for subtitle codecs. This is for
2547  * simplicity, because the performance difference is expected to be negligible
2548  * and reusing a get_buffer written for video codecs would probably perform badly
2549  * due to a potentially very different allocation pattern.
2550  *
2551  * Some decoders (those marked with AV_CODEC_CAP_DELAY) have a delay between input
2552  * and output. This means that for some packets they will not immediately
2553  * produce decoded output and need to be flushed at the end of decoding to get
2554  * all the decoded data. Flushing is done by calling this function with packets
2555  * with avpkt->data set to NULL and avpkt->size set to 0 until it stops
2556  * returning subtitles. It is safe to flush even those decoders that are not
2557  * marked with AV_CODEC_CAP_DELAY, then no subtitles will be returned.
2558  *
2559  * @note The AVCodecContext MUST have been opened with @ref avcodec_open2()
2560  * before packets may be fed to the decoder.
2561  *
2562  * @param avctx the codec context
2563  * @param[out] sub The preallocated AVSubtitle in which the decoded subtitle will be stored,
2564  * must be freed with avsubtitle_free if *got_sub_ptr is set.
2565  * @param[in,out] got_sub_ptr Zero if no subtitle could be decompressed, otherwise, it is nonzero.
2566  * @param[in] avpkt The input AVPacket containing the input buffer.
2567  */
2569  int *got_sub_ptr, const AVPacket *avpkt);
2570 
2571 /**
2572  * Supply raw packet data as input to a decoder.
2573  *
2574  * Internally, this call will copy relevant AVCodecContext fields, which can
2575  * influence decoding per-packet, and apply them when the packet is actually
2576  * decoded. (For example AVCodecContext.skip_frame, which might direct the
2577  * decoder to drop the frame contained by the packet sent with this function.)
2578  *
2579  * @warning The input buffer, avpkt->data must be AV_INPUT_BUFFER_PADDING_SIZE
2580  * larger than the actual read bytes because some optimized bitstream
2581  * readers read 32 or 64 bits at once and could read over the end.
2582  *
2583  * @note The AVCodecContext MUST have been opened with @ref avcodec_open2()
2584  * before packets may be fed to the decoder.
2585  *
2586  * @param avctx codec context
2587  * @param[in] avpkt The input AVPacket. Usually, this will be a single video
2588  * frame, or several complete audio frames.
2589  * Ownership of the packet remains with the caller, and the
2590  * decoder will not write to the packet. The decoder may create
2591  * a reference to the packet data (or copy it if the packet is
2592  * not reference-counted).
2593  * Unlike with older APIs, the packet is always fully consumed,
2594  * and if it contains multiple frames (e.g. some audio codecs),
2595  * will require you to call avcodec_receive_frame() multiple
2596  * times afterwards before you can send a new packet.
2597  * It can be NULL (or an AVPacket with data set to NULL and
2598  * size set to 0); in this case, it is considered a flush
2599  * packet, which signals the end of the stream. Sending the
2600  * first flush packet will return success. Subsequent ones are
2601  * unnecessary and will return AVERROR_EOF. If the decoder
2602  * still has frames buffered, it will return them after sending
2603  * a flush packet.
2604  *
2605  * @retval 0 success
2606  * @retval AVERROR(EAGAIN) input is not accepted in the current state - user
2607  * must read output with avcodec_receive_frame() (once
2608  * all output is read, the packet should be resent,
2609  * and the call will not fail with EAGAIN).
2610  * @retval AVERROR_EOF the decoder has been flushed, and no new packets can be
2611  * sent to it (also returned if more than 1 flush
2612  * packet is sent)
2613  * @retval AVERROR(EINVAL) codec not opened, it is an encoder, or requires flush
2614  * @retval AVERROR(ENOMEM) failed to add packet to internal queue, or similar
2615  * @retval "another negative error code" legitimate decoding errors
2616  */
2617 int avcodec_send_packet(AVCodecContext *avctx, const AVPacket *avpkt);
2618 
2619 /**
2620  * Return decoded output data from a decoder or encoder (when the
2621  * AV_CODEC_FLAG_RECON_FRAME flag is used).
2622  *
2623  * @param avctx codec context
2624  * @param frame This will be set to a reference-counted video or audio
2625  * frame (depending on the decoder type) allocated by the
2626  * codec. Note that the function will always call
2627  * av_frame_unref(frame) before doing anything else.
2628  *
2629  * @retval 0 success, a frame was returned
2630  * @retval AVERROR(EAGAIN) output is not available in this state - user must
2631  * try to send new input
2632  * @retval AVERROR_EOF the codec has been fully flushed, and there will be
2633  * no more output frames
2634  * @retval AVERROR(EINVAL) codec not opened, or it is an encoder without the
2635  * AV_CODEC_FLAG_RECON_FRAME flag enabled
2636  * @retval AVERROR_INPUT_CHANGED current decoded frame has changed parameters with
2637  * respect to first decoded frame. Applicable when flag
2638  * AV_CODEC_FLAG_DROPCHANGED is set.
2639  * @retval "other negative error code" legitimate decoding errors
2640  */
2642 
2643 /**
2644  * Supply a raw video or audio frame to the encoder. Use avcodec_receive_packet()
2645  * to retrieve buffered output packets.
2646  *
2647  * @param avctx codec context
2648  * @param[in] frame AVFrame containing the raw audio or video frame to be encoded.
2649  * Ownership of the frame remains with the caller, and the
2650  * encoder will not write to the frame. The encoder may create
2651  * a reference to the frame data (or copy it if the frame is
2652  * not reference-counted).
2653  * It can be NULL, in which case it is considered a flush
2654  * packet. This signals the end of the stream. If the encoder
2655  * still has packets buffered, it will return them after this
2656  * call. Once flushing mode has been entered, additional flush
2657  * packets are ignored, and sending frames will return
2658  * AVERROR_EOF.
2659  *
2660  * For audio:
2661  * If AV_CODEC_CAP_VARIABLE_FRAME_SIZE is set, then each frame
2662  * can have any number of samples.
2663  * If it is not set, frame->nb_samples must be equal to
2664  * avctx->frame_size for all frames except the last.
2665  * The final frame may be smaller than avctx->frame_size.
2666  * @retval 0 success
2667  * @retval AVERROR(EAGAIN) input is not accepted in the current state - user must
2668  * read output with avcodec_receive_packet() (once all
2669  * output is read, the packet should be resent, and the
2670  * call will not fail with EAGAIN).
2671  * @retval AVERROR_EOF the encoder has been flushed, and no new frames can
2672  * be sent to it
2673  * @retval AVERROR(EINVAL) codec not opened, it is a decoder, or requires flush
2674  * @retval AVERROR(ENOMEM) failed to add packet to internal queue, or similar
2675  * @retval "another negative error code" legitimate encoding errors
2676  */
2678 
2679 /**
2680  * Read encoded data from the encoder.
2681  *
2682  * @param avctx codec context
2683  * @param avpkt This will be set to a reference-counted packet allocated by the
2684  * encoder. Note that the function will always call
2685  * av_packet_unref(avpkt) before doing anything else.
2686  * @retval 0 success
2687  * @retval AVERROR(EAGAIN) output is not available in the current state - user must
2688  * try to send input
2689  * @retval AVERROR_EOF the encoder has been fully flushed, and there will be no
2690  * more output packets
2691  * @retval AVERROR(EINVAL) codec not opened, or it is a decoder
2692  * @retval "another negative error code" legitimate encoding errors
2693  */
2695 
2696 /**
2697  * Create and return a AVHWFramesContext with values adequate for hardware
2698  * decoding. This is meant to get called from the get_format callback, and is
2699  * a helper for preparing a AVHWFramesContext for AVCodecContext.hw_frames_ctx.
2700  * This API is for decoding with certain hardware acceleration modes/APIs only.
2701  *
2702  * The returned AVHWFramesContext is not initialized. The caller must do this
2703  * with av_hwframe_ctx_init().
2704  *
2705  * Calling this function is not a requirement, but makes it simpler to avoid
2706  * codec or hardware API specific details when manually allocating frames.
2707  *
2708  * Alternatively to this, an API user can set AVCodecContext.hw_device_ctx,
2709  * which sets up AVCodecContext.hw_frames_ctx fully automatically, and makes
2710  * it unnecessary to call this function or having to care about
2711  * AVHWFramesContext initialization at all.
2712  *
2713  * There are a number of requirements for calling this function:
2714  *
2715  * - It must be called from get_format with the same avctx parameter that was
2716  * passed to get_format. Calling it outside of get_format is not allowed, and
2717  * can trigger undefined behavior.
2718  * - The function is not always supported (see description of return values).
2719  * Even if this function returns successfully, hwaccel initialization could
2720  * fail later. (The degree to which implementations check whether the stream
2721  * is actually supported varies. Some do this check only after the user's
2722  * get_format callback returns.)
2723  * - The hw_pix_fmt must be one of the choices suggested by get_format. If the
2724  * user decides to use a AVHWFramesContext prepared with this API function,
2725  * the user must return the same hw_pix_fmt from get_format.
2726  * - The device_ref passed to this function must support the given hw_pix_fmt.
2727  * - After calling this API function, it is the user's responsibility to
2728  * initialize the AVHWFramesContext (returned by the out_frames_ref parameter),
2729  * and to set AVCodecContext.hw_frames_ctx to it. If done, this must be done
2730  * before returning from get_format (this is implied by the normal
2731  * AVCodecContext.hw_frames_ctx API rules).
2732  * - The AVHWFramesContext parameters may change every time time get_format is
2733  * called. Also, AVCodecContext.hw_frames_ctx is reset before get_format. So
2734  * you are inherently required to go through this process again on every
2735  * get_format call.
2736  * - It is perfectly possible to call this function without actually using
2737  * the resulting AVHWFramesContext. One use-case might be trying to reuse a
2738  * previously initialized AVHWFramesContext, and calling this API function
2739  * only to test whether the required frame parameters have changed.
2740  * - Fields that use dynamically allocated values of any kind must not be set
2741  * by the user unless setting them is explicitly allowed by the documentation.
2742  * If the user sets AVHWFramesContext.free and AVHWFramesContext.user_opaque,
2743  * the new free callback must call the potentially set previous free callback.
2744  * This API call may set any dynamically allocated fields, including the free
2745  * callback.
2746  *
2747  * The function will set at least the following fields on AVHWFramesContext
2748  * (potentially more, depending on hwaccel API):
2749  *
2750  * - All fields set by av_hwframe_ctx_alloc().
2751  * - Set the format field to hw_pix_fmt.
2752  * - Set the sw_format field to the most suited and most versatile format. (An
2753  * implication is that this will prefer generic formats over opaque formats
2754  * with arbitrary restrictions, if possible.)
2755  * - Set the width/height fields to the coded frame size, rounded up to the
2756  * API-specific minimum alignment.
2757  * - Only _if_ the hwaccel requires a pre-allocated pool: set the initial_pool_size
2758  * field to the number of maximum reference surfaces possible with the codec,
2759  * plus 1 surface for the user to work (meaning the user can safely reference
2760  * at most 1 decoded surface at a time), plus additional buffering introduced
2761  * by frame threading. If the hwaccel does not require pre-allocation, the
2762  * field is left to 0, and the decoder will allocate new surfaces on demand
2763  * during decoding.
2764  * - Possibly AVHWFramesContext.hwctx fields, depending on the underlying
2765  * hardware API.
2766  *
2767  * Essentially, out_frames_ref returns the same as av_hwframe_ctx_alloc(), but
2768  * with basic frame parameters set.
2769  *
2770  * The function is stateless, and does not change the AVCodecContext or the
2771  * device_ref AVHWDeviceContext.
2772  *
2773  * @param avctx The context which is currently calling get_format, and which
2774  * implicitly contains all state needed for filling the returned
2775  * AVHWFramesContext properly.
2776  * @param device_ref A reference to the AVHWDeviceContext describing the device
2777  * which will be used by the hardware decoder.
2778  * @param hw_pix_fmt The hwaccel format you are going to return from get_format.
2779  * @param out_frames_ref On success, set to a reference to an _uninitialized_
2780  * AVHWFramesContext, created from the given device_ref.
2781  * Fields will be set to values required for decoding.
2782  * Not changed if an error is returned.
2783  * @return zero on success, a negative value on error. The following error codes
2784  * have special semantics:
2785  * AVERROR(ENOENT): the decoder does not support this functionality. Setup
2786  * is always manual, or it is a decoder which does not
2787  * support setting AVCodecContext.hw_frames_ctx at all,
2788  * or it is a software format.
2789  * AVERROR(EINVAL): it is known that hardware decoding is not supported for
2790  * this configuration, or the device_ref is not supported
2791  * for the hwaccel referenced by hw_pix_fmt.
2792  */
2794  AVBufferRef *device_ref,
2796  AVBufferRef **out_frames_ref);
2797 
2798 
2799 
2800 /**
2801  * @defgroup lavc_parsing Frame parsing
2802  * @{
2803  */
2804 
2807  AV_PICTURE_STRUCTURE_TOP_FIELD, ///< coded as top field
2808  AV_PICTURE_STRUCTURE_BOTTOM_FIELD, ///< coded as bottom field
2809  AV_PICTURE_STRUCTURE_FRAME, ///< coded as frame
2810 };
2811 
2812 typedef struct AVCodecParserContext {
2813  void *priv_data;
2814  const struct AVCodecParser *parser;
2815  int64_t frame_offset; /* offset of the current frame */
2816  int64_t cur_offset; /* current offset
2817  (incremented by each av_parser_parse()) */
2818  int64_t next_frame_offset; /* offset of the next frame */
2819  /* video info */
2820  int pict_type; /* XXX: Put it back in AVCodecContext. */
2821  /**
2822  * This field is used for proper frame duration computation in lavf.
2823  * It signals, how much longer the frame duration of the current frame
2824  * is compared to normal frame duration.
2825  *
2826  * frame_duration = (1 + repeat_pict) * time_base
2827  *
2828  * It is used by codecs like H.264 to display telecined material.
2829  */
2830  int repeat_pict; /* XXX: Put it back in AVCodecContext. */
2831  int64_t pts; /* pts of the current frame */
2832  int64_t dts; /* dts of the current frame */
2833 
2834  /* private data */
2835  int64_t last_pts;
2836  int64_t last_dts;
2838 
2839 #define AV_PARSER_PTS_NB 4
2844 
2845  int flags;
2846 #define PARSER_FLAG_COMPLETE_FRAMES 0x0001
2847 #define PARSER_FLAG_ONCE 0x0002
2848 /// Set if the parser has a valid file offset
2849 #define PARSER_FLAG_FETCHED_OFFSET 0x0004
2850 #define PARSER_FLAG_USE_CODEC_TS 0x1000
2851 
2852  int64_t offset; ///< byte offset from starting packet start
2854 
2855  /**
2856  * Set by parser to 1 for key frames and 0 for non-key frames.
2857  * It is initialized to -1, so if the parser doesn't set this flag,
2858  * old-style fallback using AV_PICTURE_TYPE_I picture type as key frames
2859  * will be used.
2860  */
2862 
2863  // Timestamp generation support:
2864  /**
2865  * Synchronization point for start of timestamp generation.
2866  *
2867  * Set to >0 for sync point, 0 for no sync point and <0 for undefined
2868  * (default).
2869  *
2870  * For example, this corresponds to presence of H.264 buffering period
2871  * SEI message.
2872  */
2874 
2875  /**
2876  * Offset of the current timestamp against last timestamp sync point in
2877  * units of AVCodecContext.time_base.
2878  *
2879  * Set to INT_MIN when dts_sync_point unused. Otherwise, it must
2880  * contain a valid timestamp offset.
2881  *
2882  * Note that the timestamp of sync point has usually a nonzero
2883  * dts_ref_dts_delta, which refers to the previous sync point. Offset of
2884  * the next frame after timestamp sync point will be usually 1.
2885  *
2886  * For example, this corresponds to H.264 cpb_removal_delay.
2887  */
2889 
2890  /**
2891  * Presentation delay of current frame in units of AVCodecContext.time_base.
2892  *
2893  * Set to INT_MIN when dts_sync_point unused. Otherwise, it must
2894  * contain valid non-negative timestamp delta (presentation time of a frame
2895  * must not lie in the past).
2896  *
2897  * This delay represents the difference between decoding and presentation
2898  * time of the frame.
2899  *
2900  * For example, this corresponds to H.264 dpb_output_delay.
2901  */
2903 
2904  /**
2905  * Position of the packet in file.
2906  *
2907  * Analogous to cur_frame_pts/dts
2908  */
2910 
2911  /**
2912  * Byte position of currently parsed frame in stream.
2913  */
2914  int64_t pos;
2915 
2916  /**
2917  * Previous frame byte position.
2918  */
2919  int64_t last_pos;
2920 
2921  /**
2922  * Duration of the current frame.
2923  * For audio, this is in units of 1 / AVCodecContext.sample_rate.
2924  * For all other types, this is in units of AVCodecContext.time_base.
2925  */
2927 
2929 
2930  /**
2931  * Indicate whether a picture is coded as a frame, top field or bottom field.
2932  *
2933  * For example, H.264 field_pic_flag equal to 0 corresponds to
2934  * AV_PICTURE_STRUCTURE_FRAME. An H.264 picture with field_pic_flag
2935  * equal to 1 and bottom_field_flag equal to 0 corresponds to
2936  * AV_PICTURE_STRUCTURE_TOP_FIELD.
2937  */
2939 
2940  /**
2941  * Picture number incremented in presentation or output order.
2942  * This field may be reinitialized at the first picture of a new sequence.
2943  *
2944  * For example, this corresponds to H.264 PicOrderCnt.
2945  */
2947 
2948  /**
2949  * Dimensions of the decoded video intended for presentation.
2950  */
2951  int width;
2952  int height;
2953 
2954  /**
2955  * Dimensions of the coded video.
2956  */
2959 
2960  /**
2961  * The format of the coded data, corresponds to enum AVPixelFormat for video
2962  * and for enum AVSampleFormat for audio.
2963  *
2964  * Note that a decoder can have considerable freedom in how exactly it
2965  * decodes the data, so the format reported here might be different from the
2966  * one returned by a decoder.
2967  */
2968  int format;
2970 
2971 typedef struct AVCodecParser {
2972  int codec_ids[7]; /* several codec IDs are permitted */
2975  /* This callback never returns an error, a negative value means that
2976  * the frame start was in a previous packet. */
2978  AVCodecContext *avctx,
2979  const uint8_t **poutbuf, int *poutbuf_size,
2980  const uint8_t *buf, int buf_size);
2982  int (*split)(AVCodecContext *avctx, const uint8_t *buf, int buf_size);
2983 } AVCodecParser;
2984 
2985 /**
2986  * Iterate over all registered codec parsers.
2987  *
2988  * @param opaque a pointer where libavcodec will store the iteration state. Must
2989  * point to NULL to start the iteration.
2990  *
2991  * @return the next registered codec parser or NULL when the iteration is
2992  * finished
2993  */
2994 const AVCodecParser *av_parser_iterate(void **opaque);
2995 
2997 
2998 /**
2999  * Parse a packet.
3000  *
3001  * @param s parser context.
3002  * @param avctx codec context.
3003  * @param poutbuf set to pointer to parsed buffer or NULL if not yet finished.
3004  * @param poutbuf_size set to size of parsed buffer or zero if not yet finished.
3005  * @param buf input buffer.
3006  * @param buf_size buffer size in bytes without the padding. I.e. the full buffer
3007  size is assumed to be buf_size + AV_INPUT_BUFFER_PADDING_SIZE.
3008  To signal EOF, this should be 0 (so that the last frame
3009  can be output).
3010  * @param pts input presentation timestamp.
3011  * @param dts input decoding timestamp.
3012  * @param pos input byte position in stream.
3013  * @return the number of bytes of the input bitstream used.
3014  *
3015  * Example:
3016  * @code
3017  * while(in_len){
3018  * len = av_parser_parse2(myparser, AVCodecContext, &data, &size,
3019  * in_data, in_len,
3020  * pts, dts, pos);
3021  * in_data += len;
3022  * in_len -= len;
3023  *
3024  * if(size)
3025  * decode_frame(data, size);
3026  * }
3027  * @endcode
3028  */
3030  AVCodecContext *avctx,
3031  uint8_t **poutbuf, int *poutbuf_size,
3032  const uint8_t *buf, int buf_size,
3033  int64_t pts, int64_t dts,
3034  int64_t pos);
3035 
3037 
3038 /**
3039  * @}
3040  * @}
3041  */
3042 
3043 /**
3044  * @addtogroup lavc_encoding
3045  * @{
3046  */
3047 
3048 int avcodec_encode_subtitle(AVCodecContext *avctx, uint8_t *buf, int buf_size,
3049  const AVSubtitle *sub);
3050 
3051 
3052 /**
3053  * @}
3054  */
3055 
3056 /**
3057  * @defgroup lavc_misc Utility functions
3058  * @ingroup libavc
3059  *
3060  * Miscellaneous utility functions related to both encoding and decoding
3061  * (or neither).
3062  * @{
3063  */
3064 
3065 /**
3066  * @defgroup lavc_misc_pixfmt Pixel formats
3067  *
3068  * Functions for working with pixel formats.
3069  * @{
3070  */
3071 
3072 /**
3073  * Return a value representing the fourCC code associated to the
3074  * pixel format pix_fmt, or 0 if no associated fourCC code can be
3075  * found.
3076  */
3078 
3079 /**
3080  * Find the best pixel format to convert to given a certain source pixel
3081  * format. When converting from one pixel format to another, information loss
3082  * may occur. For example, when converting from RGB24 to GRAY, the color
3083  * information will be lost. Similarly, other losses occur when converting from
3084  * some formats to other formats. avcodec_find_best_pix_fmt_of_2() searches which of
3085  * the given pixel formats should be used to suffer the least amount of loss.
3086  * The pixel formats from which it chooses one, are determined by the
3087  * pix_fmt_list parameter.
3088  *
3089  *
3090  * @param[in] pix_fmt_list AV_PIX_FMT_NONE terminated array of pixel formats to choose from
3091  * @param[in] src_pix_fmt source pixel format
3092  * @param[in] has_alpha Whether the source pixel format alpha channel is used.
3093  * @param[out] loss_ptr Combination of flags informing you what kind of losses will occur.
3094  * @return The best pixel format to convert to or -1 if none was found.
3095  */
3096 enum AVPixelFormat avcodec_find_best_pix_fmt_of_list(const enum AVPixelFormat *pix_fmt_list,
3097  enum AVPixelFormat src_pix_fmt,
3098  int has_alpha, int *loss_ptr);
3099 
3100 enum AVPixelFormat avcodec_default_get_format(struct AVCodecContext *s, const enum AVPixelFormat * fmt);
3101 
3102 /**
3103  * @}
3104  */
3105 
3106 void avcodec_string(char *buf, int buf_size, AVCodecContext *enc, int encode);
3107 
3108 int avcodec_default_execute(AVCodecContext *c, int (*func)(AVCodecContext *c2, void *arg2),void *arg, int *ret, int count, int size);
3109 int avcodec_default_execute2(AVCodecContext *c, int (*func)(AVCodecContext *c2, void *arg2, int, int),void *arg, int *ret, int count);
3110 //FIXME func typedef
3111 
3112 /**
3113  * Fill AVFrame audio data and linesize pointers.
3114  *
3115  * The buffer buf must be a preallocated buffer with a size big enough
3116  * to contain the specified samples amount. The filled AVFrame data
3117  * pointers will point to this buffer.
3118  *
3119  * AVFrame extended_data channel pointers are allocated if necessary for
3120  * planar audio.
3121  *
3122  * @param frame the AVFrame
3123  * frame->nb_samples must be set prior to calling the
3124  * function. This function fills in frame->data,
3125  * frame->extended_data, frame->linesize[0].
3126  * @param nb_channels channel count
3127  * @param sample_fmt sample format
3128  * @param buf buffer to use for frame data
3129  * @param buf_size size of buffer
3130  * @param align plane size sample alignment (0 = default)
3131  * @return >=0 on success, negative error code on failure
3132  * @todo return the size in bytes required to store the samples in
3133  * case of success, at the next libavutil bump
3134  */
3136  enum AVSampleFormat sample_fmt, const uint8_t *buf,
3137  int buf_size, int align);
3138 
3139 /**
3140  * Reset the internal codec state / flush internal buffers. Should be called
3141  * e.g. when seeking or when switching to a different stream.
3142  *
3143  * @note for decoders, this function just releases any references the decoder
3144  * might keep internally, but the caller's references remain valid.
3145  *
3146  * @note for encoders, this function will only do something if the encoder
3147  * declares support for AV_CODEC_CAP_ENCODER_FLUSH. When called, the encoder
3148  * will drain any remaining packets, and can then be re-used for a different
3149  * stream (as opposed to sending a null frame which will leave the encoder
3150  * in a permanent EOF state after draining). This can be desirable if the
3151  * cost of tearing down and replacing the encoder instance is high.
3152  */
3154 
3155 /**
3156  * Return audio frame duration.
3157  *
3158  * @param avctx codec context
3159  * @param frame_bytes size of the frame, or 0 if unknown
3160  * @return frame duration, in samples, if known. 0 if not able to
3161  * determine.
3162  */
3163 int av_get_audio_frame_duration(AVCodecContext *avctx, int frame_bytes);
3164 
3165 /* memory */
3166 
3167 /**
3168  * Same behaviour av_fast_malloc but the buffer has additional
3169  * AV_INPUT_BUFFER_PADDING_SIZE at the end which will always be 0.
3170  *
3171  * In addition the whole buffer will initially and after resizes
3172  * be 0-initialized so that no uninitialized data will ever appear.
3173  */
3174 void av_fast_padded_malloc(void *ptr, unsigned int *size, size_t min_size);
3175 
3176 /**
3177  * Same behaviour av_fast_padded_malloc except that buffer will always
3178  * be 0-initialized after call.
3179  */
3180 void av_fast_padded_mallocz(void *ptr, unsigned int *size, size_t min_size);
3181 
3182 /**
3183  * @return a positive value if s is open (i.e. avcodec_open2() was called on it
3184  * with no corresponding avcodec_close()), 0 otherwise.
3185  */
3187 
3188 /**
3189  * @}
3190  */
3191 
3192 #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:2839
Convenience header that includes libavutil's core.
refcounted data buffer API
Misc types and constants that do not belong anywhere else.
AVAudioServiceType
Definition: defs.h:79
static int width
Definition: demux_decode.c:40
static AVPacket * pkt
Definition: demux_decode.c:55
static enum AVPixelFormat pix_fmt
Definition: demux_decode.c:41
static int height
Definition: demux_decode.c:40
static AVFrame * frame
Definition: demux_decode.c:54
Public dictionary API.
static void encode(AVCodecContext *ctx, AVFrame *frame, AVPacket *pkt, FILE *output)
Definition: encode_audio.c:94
reference-counted frame API
#define AV_NUM_DATA_POINTERS
Definition: frame.h:331
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.
const AVClass * avcodec_get_subtitle_rect_class(void)
Get the AVClass for AVSubtitleRect.
AVSubtitleType
Definition: avcodec.h:2282
AVFieldOrder
Definition: codec_par.h:38
void avsubtitle_free(AVSubtitle *sub)
Free all allocated data in the given subtitle struct.
AVCodecID
Identify the syntax and semantics of the bitstream.
Definition: codec_id.h:49
const char * avcodec_configuration(void)
Return the libavcodec build-time configuration.
int avcodec_parameters_to_context(AVCodecContext *codec, const AVCodecParameters *par)
Fill the codec context based on the values from the supplied codec parameters.
unsigned avcodec_version(void)
Return the LIBAVCODEC_VERSION_INT constant.
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.
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:2285
@ SUBTITLE_ASS
Formatted text, the ass field must be set by the decoder and is authoritative.
Definition: avcodec.h:2297
@ SUBTITLE_TEXT
Plain text, the text field must be set by the decoder and is authoritative.
Definition: avcodec.h:2291
@ SUBTITLE_NONE
Definition: avcodec.h:2283
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 or encoder (when the AV_CODEC_FLAG_RECON_FRAME flag is used...
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: defs.h:67
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_decode_subtitle2(AVCodecContext *avctx, AVSubtitle *sub, int *got_sub_ptr, const AVPacket *avpkt)
Decode a subtitle message.
attribute_deprecated enum AVChromaLocation avcodec_chroma_pos_to_enum(int xpos, int ypos)
Converts swscale x/y chroma position to AVChromaLocation.
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_enum_to_chroma_pos(int *xpos, int *ypos, enum AVChromaLocation pos)
Converts AVChromaLocation to swscale x/y chroma position.
int avcodec_default_get_encode_buffer(AVCodecContext *s, AVPacket *pkt, int flags)
The default callback for AVCodecContext.get_encode_buffer().
int avcodec_encode_subtitle(AVCodecContext *avctx, uint8_t *buf, int buf_size, const AVSubtitle *sub)
enum AVPixelFormat avcodec_default_get_format(struct AVCodecContext *s, const enum AVPixelFormat *fmt)
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.
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_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)
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)
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)
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.
AVCodecParserContext * av_parser_init(int codec_id)
void av_parser_close(AVCodecParserContext *s)
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:2805
@ AV_PICTURE_STRUCTURE_FRAME
coded as frame
Definition: avcodec.h:2809
@ AV_PICTURE_STRUCTURE_BOTTOM_FIELD
coded as bottom field
Definition: avcodec.h:2808
@ AV_PICTURE_STRUCTURE_TOP_FIELD
coded as top field
Definition: avcodec.h:2807
@ AV_PICTURE_STRUCTURE_UNKNOWN
unknown
Definition: avcodec.h:2806
unsigned size
allocated memory
Definition: bprint.h:99
struct AVDictionary AVDictionary
Definition: dict.h:94
AVMediaType
Definition: avutil.h:199
AVSampleFormat
Audio sample formats.
Definition: samplefmt.h:55
static enum AVPixelFormat hw_pix_fmt
Definition: hw_decode.c:45
Libavutil version macros.
swscale version macros
pixel format definitions
AVChromaLocation
Location of chroma samples.
Definition: pixfmt.h:680
AVColorRange
Visual content value range.
Definition: pixfmt.h:626
AVPixelFormat
Pixel format.
Definition: pixfmt.h:64
AVColorPrimaries
Chromaticity coordinates of the source primaries.
Definition: pixfmt.h:533
AVColorTransferCharacteristic
Color Transfer Characteristic.
Definition: pixfmt.h:558
AVColorSpace
YUV colorspace type.
Definition: pixfmt.h:587
Utilties for rational number calculation.
A reference to a data buffer.
Definition: buffer.h:82
An AVChannelLayout holds information about the channel layout of audio data.
Describe the class of an AVClass context structure.
Definition: log.h:66
main external API structure.
Definition: avcodec.h:426
int nsse_weight
noise vs.
Definition: avcodec.h:1558
float rc_max_available_vbv_use
Ratecontrol attempt to use, at maximum, of what can be used without an underflow.
Definition: avcodec.h:1268
int skip_top
Number of macroblock rows at the top which are skipped.
Definition: avcodec.h:933
int trellis
trellis RD quantization
Definition: avcodec.h:1289
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
Definition: avcodec.h:635
int64_t pts_correction_last_dts
PTS of the last frame.
Definition: avcodec.h:1781
int max_qdiff
maximum quantizer difference between frames
Definition: avcodec.h:1232
uint16_t * chroma_intra_matrix
custom intra quantization matrix
Definition: avcodec.h:1828
const AVCodecDescriptor * codec_descriptor
AVCodecDescriptor.
Definition: avcodec.h:1771
int hwaccel_flags
Bit set of AV_HWACCEL_FLAG_* flags, which affect hardware accelerated decoding (if active).
Definition: avcodec.h:1937
int subtitle_header_size
Definition: avcodec.h:1724
int width
picture width / height.
Definition: avcodec.h:598
AVPacketSideData * coded_side_data
Additional data associated with the entire coded stream.
Definition: avcodec.h:1862
int64_t pts_correction_num_faulty_dts
Number of incorrect PTS values so far.
Definition: avcodec.h:1779
char * stats_out
pass1 encoding statistics output buffer
Definition: avcodec.h:1296
int rc_buffer_size
decoder bitstream buffer size
Definition: avcodec.h:1239
attribute_deprecated int frame_number
Frame counter, set by libavcodec.
Definition: avcodec.h:1076
AVChannelLayout ch_layout
Audio channel layout.
Definition: avcodec.h:2054
int64_t pts_correction_last_pts
Number of incorrect DTS values so far.
Definition: avcodec.h:1780
int me_cmp
motion estimation comparison function
Definition: avcodec.h:802
int flags2
AV_CODEC_FLAG2_*.
Definition: avcodec.h:513
enum AVSampleFormat sample_fmt
audio sample format
Definition: avcodec.h:1050
int debug
debug
Definition: avcodec.h:1358
enum AVPixelFormat sw_pix_fmt
Nominal unaccelerated pixel format, see AV_PIX_FMT_xxx.
Definition: avcodec.h:1757
int global_quality
Global quality for codecs which cannot change it per frame.
Definition: avcodec.h:492
int64_t max_pixels
The number of pixels per image to maximally accept.
Definition: avcodec.h:1906
attribute_deprecated uint64_t request_channel_layout
Request decoder to use this channel layout if it can (0 for default)
Definition: avcodec.h:1109
enum AVColorRange color_range
MPEG vs JPEG YUV range.
Definition: avcodec.h:1009
char * sub_charenc
DTS of the last frame.
Definition: avcodec.h:1788
int error_concealment
error concealment flags
Definition: avcodec.h:1348
int dct_algo
DCT algorithm, see FF_DCT_* below.
Definition: avcodec.h:1443
unsigned int codec_tag
fourcc (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A').
Definition: avcodec.h:451
int slice_flags
slice flags
Definition: avcodec.h:888
int strict_std_compliance
strictly follow the standard (MPEG-4, ...).
Definition: avcodec.h:1341
float b_quant_offset
qscale offset between IP and B-frames
Definition: avcodec.h:713
int nb_coded_side_data
Definition: avcodec.h:1863
AVRational pkt_timebase
Timebase in which pkt_dts/pts and AVPacket.dts/pts are.
Definition: avcodec.h:1764
enum AVPixelFormat(* get_format)(struct AVCodecContext *s, const enum AVPixelFormat *fmt)
Callback to negotiate the pixel format.
Definition: avcodec.h:689
enum AVAudioServiceType audio_service_type
Type of service that the audio stream conveys.
Definition: avcodec.h:1117
enum AVColorPrimaries color_primaries
Chromaticity coordinates of the source primaries.
Definition: avcodec.h:988
int me_subpel_quality
subpel ME quality
Definition: avcodec.h:872
AVBufferRef * hw_frames_ctx
A reference to the AVHWFramesContext describing the input (for encoding) or output (decoding) frames.
Definition: avcodec.h:1887
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:697
int mb_lmax
maximum MB Lagrange multiplier
Definition: avcodec.h:954
int qmin
minimum quantizer
Definition: avcodec.h:1218
int keyint_min
minimum GOP size
Definition: avcodec.h:967
enum AVMediaType codec_type
Definition: avcodec.h:434
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:706
int dia_size
ME diamond size & shape.
Definition: avcodec.h:844
int64_t frame_num
Frame counter, set by libavcodec.
Definition: avcodec.h:2065
int workaround_bugs
Work around bugs in encoders which sometimes cannot be detected automatically.
Definition: avcodec.h:1311
int apply_cropping
Video decoding only.
Definition: avcodec.h:1964
AVRational framerate
Definition: avcodec.h:1750
int bidir_refine
Definition: avcodec.h:960
char * stats_in
pass2 encoding statistics input buffer Concatenated stuff from stats_out of pass1 should be placed he...
Definition: avcodec.h:1304
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:795
int bits_per_coded_sample
bits per sample/pixel from the demuxer (needed for huffyuv).
Definition: avcodec.h:1480
int rc_override_count
ratecontrol override, see RcOverride
Definition: avcodec.h:1246
uint8_t * dump_separator
dump format separator.
Definition: avcodec.h:1836
attribute_deprecated uint64_t channel_layout
Audio channel layout.
Definition: avcodec.h:1100
int slice_count
slice count
Definition: avcodec.h:779
int ticks_per_frame
For some codecs, the time base is closer to the field rate than the frame rate.
Definition: avcodec.h:557
enum AVFieldOrder field_order
Field order.
Definition: avcodec.h:1031
uint16_t * inter_matrix
custom inter quantization matrix Must be allocated with the av_malloc() family of functions,...
Definition: avcodec.h:919
const struct AVHWAccel * hwaccel
Hardware accelerator in use.
Definition: avcodec.h:1405
int active_thread_type
Which multithreading methods are in use by the codec.
Definition: avcodec.h:1521
int(* get_encode_buffer)(struct AVCodecContext *s, AVPacket *pkt, int flags)
This callback is called at the beginning of each packet to get a data buffer for it.
Definition: avcodec.h:2046
int sub_charenc_mode
Subtitles character encoding mode.
Definition: avcodec.h:1796
int bit_rate_tolerance
number of bits the bitstream is allowed to diverge from the reference.
Definition: avcodec.h:484
int mb_decision
macroblock decision mode
Definition: avcodec.h:898
int has_b_frames
Size of the frame reordering buffer in the decoder.
Definition: avcodec.h:721
char * codec_whitelist
',' separated list of allowed decoders.
Definition: avcodec.h:1844
int level
level
Definition: avcodec.h:1691
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:660
int64_t bit_rate
the average bitrate
Definition: avcodec.h:476
enum AVDiscard skip_loop_filter
Skip loop filtering for selected frames.
Definition: avcodec.h:1699
int64_t pts_correction_num_faulty_pts
Current statistics for PTS correction.
Definition: avcodec.h:1778
const struct AVCodec * codec
Definition: avcodec.h:435
attribute_deprecated int64_t reordered_opaque
opaque 64-bit number (generally a PTS) that will be reordered and output in AVFrame....
Definition: avcodec.h:1397
attribute_deprecated int channels
number of audio channels
Definition: avcodec.h:1042
int rc_initial_buffer_occupancy
Number of bits which should be loaded into the rc buffer before decoding starts.
Definition: avcodec.h:1282
int thread_type
Which multithreading methods to use.
Definition: avcodec.h:1512
int me_sub_cmp
subpixel motion estimation comparison function
Definition: avcodec.h:808
int profile
profile
Definition: avcodec.h:1565
unsigned properties
Properties of the stream that gets decoded.
Definition: avcodec.h:1851
int last_predictor_count
amount of previous MV predictors (2a+1 x 2a+1 square)
Definition: avcodec.h:851
int log_level_offset
Definition: avcodec.h:432
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:1532
int bits_per_raw_sample
Bits per sample/pixel of internal libavcodec pixel/sample format.
Definition: avcodec.h:1487
int idct_algo
IDCT algorithm, see FF_IDCT_* below.
Definition: avcodec.h:1456
int export_side_data
Bit set of AV_CODEC_EXPORT_DATA_* flags, which affects the kind of metadata exported in frame,...
Definition: avcodec.h:2004
enum AVColorSpace colorspace
YUV colorspace type.
Definition: avcodec.h:1002
enum AVSampleFormat request_sample_fmt
desired sample format
Definition: avcodec.h:1125
int initial_padding
Audio only.
Definition: avcodec.h:1741
float temporal_cplx_masking
temporary complexity masking (0-> disabled)
Definition: avcodec.h:751
int sample_rate
samples per second
Definition: avcodec.h:1034
const AVClass * av_class
information on struct for av_log
Definition: avcodec.h:431
float p_masking
p block masking (0-> disabled)
Definition: avcodec.h:765
int delay
Codec delay.
Definition: avcodec.h:581
float dark_masking
darkness masking (0-> disabled)
Definition: avcodec.h:772
int mb_cmp
macroblock comparison function (not supported yet)
Definition: avcodec.h:814
int gop_size
the number of pictures in a group of pictures, or 0 for intra_only
Definition: avcodec.h:620
int skip_alpha
Skip processing alpha if supported by codec.
Definition: avcodec.h:1814
int refs
number of reference frames
Definition: avcodec.h:974
int ildct_cmp
interlaced DCT comparison function
Definition: avcodec.h:820
int mv0_threshold
Note: Value depends upon the compare function used for fullpel ME.
Definition: avcodec.h:981
int mb_lmin
minimum MB Lagrange multiplier
Definition: avcodec.h:947
int64_t rc_max_rate
maximum bitrate
Definition: avcodec.h:1254
int compression_level
Definition: avcodec.h:498
int discard_damaged_percentage
The percentage of damaged samples to discard a frame.
Definition: avcodec.h:1986
int thread_count
thread count is used to decide how many independent tasks should be passed to execute()
Definition: avcodec.h:1502
void * opaque
Private data of the user, can be used to carry app specific stuff.
Definition: avcodec.h:468
int qmax
maximum quantizer
Definition: avcodec.h:1225
void * hwaccel_context
Legacy hardware accelerator context.
Definition: avcodec.h:1429
uint16_t * intra_matrix
custom intra quantization matrix Must be allocated with the av_malloc() family of functions,...
Definition: avcodec.h:910
int coded_height
Definition: avcodec.h:613
enum AVColorTransferCharacteristic color_trc
Color Transfer Characteristic.
Definition: avcodec.h:995
float rc_min_vbv_overflow_use
Ratecontrol attempt to use, at least, times the amount needed to prevent a vbv overflow.
Definition: avcodec.h:1275
uint8_t * subtitle_header
Header containing style information for text subtitles.
Definition: avcodec.h:1723
AVRational time_base
This is the fundamental unit of time (in seconds) in terms of which frame timestamps are represented.
Definition: avcodec.h:548
int flags
AV_CODEC_FLAG_*.
Definition: avcodec.h:506
int seek_preroll
Number of samples to skip after a discontinuity.
Definition: avcodec.h:1821
uint8_t * extradata
some codecs need / can use extradata like Huffman tables.
Definition: avcodec.h:527
int me_pre_cmp
motion estimation prepass comparison function
Definition: avcodec.h:858
int64_t rc_min_rate
minimum bitrate
Definition: avcodec.h:1261
int trailing_padding
Audio only.
Definition: avcodec.h:1898
enum AVDiscard skip_idct
Skip IDCT/dequantization for selected frames.
Definition: avcodec.h:1706
int intra_dc_precision
precision of the intra DC coefficient - 8
Definition: avcodec.h:926
enum AVChromaLocation chroma_sample_location
This defines the location of chroma samples.
Definition: avcodec.h:1016
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:1551
uint64_t error[AV_NUM_DATA_POINTERS]
error
Definition: avcodec.h:1436
float qcompress
amount of qscale change between easy & hard scenes (0.0-1.0)
Definition: avcodec.h:1210
float qblur
amount of qscale smoothing over time (0.0-1.0)
Definition: avcodec.h:1211
AVBufferRef * hw_device_ctx
A reference to the AVHWDeviceContext describing the device which will be used by a hardware encoder/d...
Definition: avcodec.h:1928
int me_range
maximum motion estimation search range in subpel units If 0 then no limit.
Definition: avcodec.h:881
int extra_hw_frames
Definition: avcodec.h:1978
RcOverride * rc_override
Definition: avcodec.h:1247
int64_t max_samples
The number of samples per frame to maximally accept.
Definition: avcodec.h:1994
enum AVCodecID codec_id
Definition: avcodec.h:436
int pre_dia_size
ME prepass diamond size & shape.
Definition: avcodec.h:865
float lumi_masking
luminance masking (0-> disabled)
Definition: avcodec.h:744
int extradata_size
Definition: avcodec.h:528
int cutoff
Audio cutoff bandwidth (0 means "automatic")
Definition: avcodec.h:1090
int skip_bottom
Number of macroblock rows at the bottom which are skipped.
Definition: avcodec.h:940
int coded_width
Bitstream width / height, may be different from width/height e.g.
Definition: avcodec.h:613
int block_align
number of bytes per packet if constant and known or 0 Used by some WAV based audio codecs.
Definition: avcodec.h:1083
int frame_size
Number of samples per channel in an audio frame.
Definition: avcodec.h:1062
int * slice_offset
slice offsets in the frame in bytes
Definition: avcodec.h:786
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:730
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:1207
int lowres
low resolution decoding, 1-> 1/2 size, 2->1/4 size
Definition: avcodec.h:1494
void * priv_data
Definition: avcodec.h:453
float spatial_cplx_masking
spatial complexity masking (0-> disabled)
Definition: avcodec.h:758
enum AVDiscard skip_frame
Skip decoding for selected frames.
Definition: avcodec.h:1713
int err_recognition
Error recognition; may misdetect some more or less valid parts as errors.
Definition: avcodec.h:1382
float i_quant_offset
qscale offset between P and I-frames
Definition: avcodec.h:737
int slices
Number of slices.
Definition: avcodec.h:1025
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:54
int duration
Duration of the current frame.
Definition: avcodec.h:2926
int dts_ref_dts_delta
Offset of the current timestamp against last timestamp sync point in units of AVCodecContext....
Definition: avcodec.h:2888
int64_t cur_frame_end[AV_PARSER_PTS_NB]
Definition: avcodec.h:2853
int width
Dimensions of the decoded video intended for presentation.
Definition: avcodec.h:2951
enum AVFieldOrder field_order
Definition: avcodec.h:2928
const struct AVCodecParser * parser
Definition: avcodec.h:2814
int64_t pos
Byte position of currently parsed frame in stream.
Definition: avcodec.h:2914
int format
The format of the coded data, corresponds to enum AVPixelFormat for video and for enum AVSampleFormat...
Definition: avcodec.h:2968
int repeat_pict
This field is used for proper frame duration computation in lavf.
Definition: avcodec.h:2830
enum AVPictureStructure picture_structure
Indicate whether a picture is coded as a frame, top field or bottom field.
Definition: avcodec.h:2938
int64_t cur_frame_dts[AV_PARSER_PTS_NB]
Definition: avcodec.h:2843
int64_t cur_frame_pos[AV_PARSER_PTS_NB]
Position of the packet in file.
Definition: avcodec.h:2909
int output_picture_number
Picture number incremented in presentation or output order.
Definition: avcodec.h:2946
int pts_dts_delta
Presentation delay of current frame in units of AVCodecContext.time_base.
Definition: avcodec.h:2902
int64_t next_frame_offset
Definition: avcodec.h:2818
int64_t cur_frame_pts[AV_PARSER_PTS_NB]
Definition: avcodec.h:2842
int64_t cur_frame_offset[AV_PARSER_PTS_NB]
Definition: avcodec.h:2841
int key_frame
Set by parser to 1 for key frames and 0 for non-key frames.
Definition: avcodec.h:2861
int64_t frame_offset
Definition: avcodec.h:2815
int64_t last_pos
Previous frame byte position.
Definition: avcodec.h:2919
int coded_width
Dimensions of the coded video.
Definition: avcodec.h:2957
int64_t offset
byte offset from starting packet start
Definition: avcodec.h:2852
int dts_sync_point
Synchronization point for start of timestamp generation.
Definition: avcodec.h:2873
int priv_data_size
Definition: avcodec.h:2973
int codec_ids[7]
Definition: avcodec.h:2972
int(* split)(AVCodecContext *avctx, const uint8_t *buf, int buf_size)
Definition: avcodec.h:2982
void(* parser_close)(AVCodecParserContext *s)
Definition: avcodec.h:2981
int(* parser_parse)(AVCodecParserContext *s, AVCodecContext *avctx, const uint8_t **poutbuf, int *poutbuf_size, const uint8_t *buf, int buf_size)
Definition: avcodec.h:2977
int(* parser_init)(AVCodecParserContext *s)
Definition: avcodec.h:2974
AVCodec.
Definition: codec.h:184
This structure describes decoded (raw) audio or video data.
Definition: frame.h:330
int priv_data_size
Size of the private data to allocate in AVCodecInternal.hwaccel_priv_data.
Definition: avcodec.h:2208
int(* alloc_frame)(AVCodecContext *avctx, AVFrame *frame)
Allocate a custom buffer.
Definition: avcodec.h:2122
int(* uninit)(AVCodecContext *avctx)
Uninitialize the hwaccel private data.
Definition: avcodec.h:2202
enum AVCodecID id
Codec implemented by the hardware accelerator.
Definition: avcodec.h:2096
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:2138
int(* init)(AVCodecContext *avctx)
Initialize the hwaccel private data.
Definition: avcodec.h:2194
const char * name
Name of the hardware accelerated codec.
Definition: avcodec.h:2082
int capabilities
Hardware accelerated codec capabilities.
Definition: avcodec.h:2109
int(* decode_slice)(AVCodecContext *avctx, const uint8_t *buf, uint32_t buf_size)
Callback for each slice.
Definition: avcodec.h:2165
int(* frame_params)(AVCodecContext *avctx, AVBufferRef *hw_frames_ctx)
Fill the given hw_frames context with current codec parameters.
Definition: avcodec.h:2223
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:2152
enum AVPixelFormat pix_fmt
Supported pixel format.
Definition: avcodec.h:2103
int caps_internal
Internal hwaccel capabilities.
Definition: avcodec.h:2213
int(* end_frame)(AVCodecContext *avctx)
Called at the end of each frame or field picture.
Definition: avcodec.h:2176
int frame_priv_data_size
Size of per-frame hardware accelerator private data.
Definition: avcodec.h:2185
enum AVMediaType type
Type of codec implemented by the hardware accelerator.
Definition: avcodec.h:2089
This structure stores compressed data.
Definition: packet.h:351
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:2303
char * ass
0 terminated ASS/SSA compatible event line.
Definition: avcodec.h:2325
int w
width of pict, undefined when pict is not set
Definition: avcodec.h:2305
int nb_colors
number of colors in pict, undefined when pict is not set
Definition: avcodec.h:2307
char * text
0 terminated plain UTF-8 text
Definition: avcodec.h:2318
uint8_t * data[4]
data+linesize for the bitmap of this subtitle.
Definition: avcodec.h:2313
int y
top left corner of pict, undefined when pict is not set
Definition: avcodec.h:2304
enum AVSubtitleType type
Definition: avcodec.h:2316
int linesize[4]
Definition: avcodec.h:2314
int h
height of pict, undefined when pict is not set
Definition: avcodec.h:2306
uint16_t format
Definition: avcodec.h:2331
uint32_t start_display_time
Definition: avcodec.h:2332
uint32_t end_display_time
Definition: avcodec.h:2333
unsigned num_rects
Definition: avcodec.h:2334
AVSubtitleRect ** rects
Definition: avcodec.h:2335
int64_t pts
Same as packet pts, in AV_TIME_BASE.
Definition: avcodec.h:2336
int qscale
Definition: avcodec.h:199
int start_frame
Definition: avcodec.h:197
int end_frame
Definition: avcodec.h:198
float quality_factor
Definition: avcodec.h:200
static int64_t pts