av1: Add codec_id and basic demuxing support
[libav.git] / libavcodec / avcodec.h
1 /*
2 * copyright (c) 2001 Fabrice Bellard
3 *
4 * This file is part of Libav.
5 *
6 * Libav 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 * Libav 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 Libav; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19 */
20
21 #ifndef AVCODEC_AVCODEC_H
22 #define AVCODEC_AVCODEC_H
23
24 /**
25 * @file
26 * @ingroup libavc
27 * Libavcodec external API header
28 */
29
30 #include <errno.h>
31 #include "libavutil/samplefmt.h"
32 #include "libavutil/attributes.h"
33 #include "libavutil/avutil.h"
34 #include "libavutil/buffer.h"
35 #include "libavutil/cpu.h"
36 #include "libavutil/dict.h"
37 #include "libavutil/frame.h"
38 #include "libavutil/log.h"
39 #include "libavutil/pixfmt.h"
40 #include "libavutil/rational.h"
41
42 #include "version.h"
43
44 #if FF_API_FAST_MALLOC
45 // to provide fast_*alloc
46 #include "libavutil/mem.h"
47 #endif
48
49 /**
50 * @defgroup libavc Encoding/Decoding Library
51 * @{
52 *
53 * @defgroup lavc_decoding Decoding
54 * @{
55 * @}
56 *
57 * @defgroup lavc_encoding Encoding
58 * @{
59 * @}
60 *
61 * @defgroup lavc_codec Codecs
62 * @{
63 * @defgroup lavc_codec_native Native Codecs
64 * @{
65 * @}
66 * @defgroup lavc_codec_wrappers External library wrappers
67 * @{
68 * @}
69 * @defgroup lavc_codec_hwaccel Hardware Accelerators bridge
70 * @{
71 * @}
72 * @}
73 * @defgroup lavc_internal Internal
74 * @{
75 * @}
76 * @}
77 */
78
79 /**
80 * @ingroup libavc
81 * @defgroup lavc_encdec send/receive encoding and decoding API overview
82 * @{
83 *
84 * The avcodec_send_packet()/avcodec_receive_frame()/avcodec_send_frame()/
85 * avcodec_receive_packet() functions provide an encode/decode API, which
86 * decouples input and output.
87 *
88 * The API is very similar for encoding/decoding and audio/video, and works as
89 * follows:
90 * - Set up and open the AVCodecContext as usual.
91 * - Send valid input:
92 * - For decoding, call avcodec_send_packet() to give the decoder raw
93 * compressed data in an AVPacket.
94 * - For encoding, call avcodec_send_frame() to give the decoder an AVFrame
95 * containing uncompressed audio or video.
96 * In both cases, it is recommended that AVPackets and AVFrames are
97 * refcounted, or libavcodec might have to copy the input data. (libavformat
98 * always returns refcounted AVPackets, and av_frame_get_buffer() allocates
99 * refcounted AVFrames.)
100 * - Receive output in a loop. Periodically call one of the avcodec_receive_*()
101 * functions and process their output:
102 * - For decoding, call avcodec_receive_frame(). On success, it will return
103 * an AVFrame containing uncompressed audio or video data.
104 * - For encoding, call avcodec_receive_packet(). On success, it will return
105 * an AVPacket with a compressed frame.
106 * Repeat this call until it returns AVERROR(EAGAIN) or an error. The
107 * AVERROR(EAGAIN) return value means that new input data is required to
108 * return new output. In this case, continue with sending input. For each
109 * input frame/packet, the codec will typically return 1 output frame/packet,
110 * but it can also be 0 or more than 1.
111 *
112 * At the beginning of decoding or encoding, the codec might accept multiple
113 * input frames/packets without returning a frame, until its internal buffers
114 * are filled. This situation is handled transparently if you follow the steps
115 * outlined above.
116 *
117 * End of stream situations. These require "flushing" (aka draining) the codec,
118 * as the codec might buffer multiple frames or packets internally for
119 * performance or out of necessity (consider B-frames).
120 * This is handled as follows:
121 * - Instead of valid input, send NULL to the avcodec_send_packet() (decoding)
122 * or avcodec_send_frame() (encoding) functions. This will enter draining
123 * mode.
124 * - Call avcodec_receive_frame() (decoding) or avcodec_receive_packet()
125 * (encoding) in a loop until AVERROR_EOF is returned. The functions will
126 * not return AVERROR(EAGAIN), unless you forgot to enter draining mode.
127 * - Before decoding can be resumed again, the codec has to be reset with
128 * avcodec_flush_buffers().
129 *
130 * Using the API as outlined above is highly recommended. But it is also
131 * possible to call functions outside of this rigid schema. For example, you can
132 * call avcodec_send_packet() repeatedly without calling
133 * avcodec_receive_frame(). In this case, avcodec_send_packet() will succeed
134 * until the codec's internal buffer has been filled up (which is typically of
135 * size 1 per output frame, after initial input), and then reject input with
136 * AVERROR(EAGAIN). Once it starts rejecting input, you have no choice but to
137 * read at least some output.
138 *
139 * Not all codecs will follow a rigid and predictable dataflow; the only
140 * guarantee is that an AVERROR(EAGAIN) return value on a send/receive call on
141 * one end implies that a receive/send call on the other end will succeed. In
142 * general, no codec will permit unlimited buffering of input or output.
143 *
144 * This API replaces the following legacy functions:
145 * - avcodec_decode_video2() and avcodec_decode_audio4():
146 * Use avcodec_send_packet() to feed input to the decoder, then use
147 * avcodec_receive_frame() to receive decoded frames after each packet.
148 * Unlike with the old video decoding API, multiple frames might result from
149 * a packet. For audio, splitting the input packet into frames by partially
150 * decoding packets becomes transparent to the API user. You never need to
151 * feed an AVPacket to the API twice.
152 * Additionally, sending a flush/draining packet is required only once.
153 * - avcodec_encode_video2()/avcodec_encode_audio2():
154 * Use avcodec_send_frame() to feed input to the encoder, then use
155 * avcodec_receive_packet() to receive encoded packets.
156 * Providing user-allocated buffers for avcodec_receive_packet() is not
157 * possible.
158 * - The new API does not handle subtitles yet.
159 *
160 * Mixing new and old function calls on the same AVCodecContext is not allowed,
161 * and will result in arbitrary behavior.
162 *
163 * Some codecs might require using the new API; using the old API will return
164 * an error when calling it.
165 * @}
166 */
167
168 /**
169 * @defgroup lavc_core Core functions/structures.
170 * @ingroup libavc
171 *
172 * Basic definitions, functions for querying libavcodec capabilities,
173 * allocating core structures, etc.
174 * @{
175 */
176
177
178 /**
179 * Identify the syntax and semantics of the bitstream.
180 * The principle is roughly:
181 * Two decoders with the same ID can decode the same streams.
182 * Two encoders with the same ID can encode compatible streams.
183 * There may be slight deviations from the principle due to implementation
184 * details.
185 *
186 * If you add a codec ID to this list, add it so that
187 * 1. no value of a existing codec ID changes (that would break ABI),
188 * 2. it is as close as possible to similar codecs.
189 *
190 * After adding new codec IDs, do not forget to add an entry to the codec
191 * descriptor list and bump libavcodec minor version.
192 */
193 enum AVCodecID {
194 AV_CODEC_ID_NONE,
195
196 /* video codecs */
197 AV_CODEC_ID_MPEG1VIDEO,
198 AV_CODEC_ID_MPEG2VIDEO, ///< preferred ID for MPEG-1/2 video decoding
199 #if FF_API_XVMC
200 AV_CODEC_ID_MPEG2VIDEO_XVMC,
201 #endif /* FF_API_XVMC */
202 AV_CODEC_ID_H261,
203 AV_CODEC_ID_H263,
204 AV_CODEC_ID_RV10,
205 AV_CODEC_ID_RV20,
206 AV_CODEC_ID_MJPEG,
207 AV_CODEC_ID_MJPEGB,
208 AV_CODEC_ID_LJPEG,
209 AV_CODEC_ID_SP5X,
210 AV_CODEC_ID_JPEGLS,
211 AV_CODEC_ID_MPEG4,
212 AV_CODEC_ID_RAWVIDEO,
213 AV_CODEC_ID_MSMPEG4V1,
214 AV_CODEC_ID_MSMPEG4V2,
215 AV_CODEC_ID_MSMPEG4V3,
216 AV_CODEC_ID_WMV1,
217 AV_CODEC_ID_WMV2,
218 AV_CODEC_ID_H263P,
219 AV_CODEC_ID_H263I,
220 AV_CODEC_ID_FLV1,
221 AV_CODEC_ID_SVQ1,
222 AV_CODEC_ID_SVQ3,
223 AV_CODEC_ID_DVVIDEO,
224 AV_CODEC_ID_HUFFYUV,
225 AV_CODEC_ID_CYUV,
226 AV_CODEC_ID_H264,
227 AV_CODEC_ID_INDEO3,
228 AV_CODEC_ID_VP3,
229 AV_CODEC_ID_THEORA,
230 AV_CODEC_ID_ASV1,
231 AV_CODEC_ID_ASV2,
232 AV_CODEC_ID_FFV1,
233 AV_CODEC_ID_4XM,
234 AV_CODEC_ID_VCR1,
235 AV_CODEC_ID_CLJR,
236 AV_CODEC_ID_MDEC,
237 AV_CODEC_ID_ROQ,
238 AV_CODEC_ID_INTERPLAY_VIDEO,
239 AV_CODEC_ID_XAN_WC3,
240 AV_CODEC_ID_XAN_WC4,
241 AV_CODEC_ID_RPZA,
242 AV_CODEC_ID_CINEPAK,
243 AV_CODEC_ID_WS_VQA,
244 AV_CODEC_ID_MSRLE,
245 AV_CODEC_ID_MSVIDEO1,
246 AV_CODEC_ID_IDCIN,
247 AV_CODEC_ID_8BPS,
248 AV_CODEC_ID_SMC,
249 AV_CODEC_ID_FLIC,
250 AV_CODEC_ID_TRUEMOTION1,
251 AV_CODEC_ID_VMDVIDEO,
252 AV_CODEC_ID_MSZH,
253 AV_CODEC_ID_ZLIB,
254 AV_CODEC_ID_QTRLE,
255 AV_CODEC_ID_TSCC,
256 AV_CODEC_ID_ULTI,
257 AV_CODEC_ID_QDRAW,
258 AV_CODEC_ID_VIXL,
259 AV_CODEC_ID_QPEG,
260 AV_CODEC_ID_PNG,
261 AV_CODEC_ID_PPM,
262 AV_CODEC_ID_PBM,
263 AV_CODEC_ID_PGM,
264 AV_CODEC_ID_PGMYUV,
265 AV_CODEC_ID_PAM,
266 AV_CODEC_ID_FFVHUFF,
267 AV_CODEC_ID_RV30,
268 AV_CODEC_ID_RV40,
269 AV_CODEC_ID_VC1,
270 AV_CODEC_ID_WMV3,
271 AV_CODEC_ID_LOCO,
272 AV_CODEC_ID_WNV1,
273 AV_CODEC_ID_AASC,
274 AV_CODEC_ID_INDEO2,
275 AV_CODEC_ID_FRAPS,
276 AV_CODEC_ID_TRUEMOTION2,
277 AV_CODEC_ID_BMP,
278 AV_CODEC_ID_CSCD,
279 AV_CODEC_ID_MMVIDEO,
280 AV_CODEC_ID_ZMBV,
281 AV_CODEC_ID_AVS,
282 AV_CODEC_ID_SMACKVIDEO,
283 AV_CODEC_ID_NUV,
284 AV_CODEC_ID_KMVC,
285 AV_CODEC_ID_FLASHSV,
286 AV_CODEC_ID_CAVS,
287 AV_CODEC_ID_JPEG2000,
288 AV_CODEC_ID_VMNC,
289 AV_CODEC_ID_VP5,
290 AV_CODEC_ID_VP6,
291 AV_CODEC_ID_VP6F,
292 AV_CODEC_ID_TARGA,
293 AV_CODEC_ID_DSICINVIDEO,
294 AV_CODEC_ID_TIERTEXSEQVIDEO,
295 AV_CODEC_ID_TIFF,
296 AV_CODEC_ID_GIF,
297 AV_CODEC_ID_DXA,
298 AV_CODEC_ID_DNXHD,
299 AV_CODEC_ID_THP,
300 AV_CODEC_ID_SGI,
301 AV_CODEC_ID_C93,
302 AV_CODEC_ID_BETHSOFTVID,
303 AV_CODEC_ID_PTX,
304 AV_CODEC_ID_TXD,
305 AV_CODEC_ID_VP6A,
306 AV_CODEC_ID_AMV,
307 AV_CODEC_ID_VB,
308 AV_CODEC_ID_PCX,
309 AV_CODEC_ID_SUNRAST,
310 AV_CODEC_ID_INDEO4,
311 AV_CODEC_ID_INDEO5,
312 AV_CODEC_ID_MIMIC,
313 AV_CODEC_ID_RL2,
314 AV_CODEC_ID_ESCAPE124,
315 AV_CODEC_ID_DIRAC,
316 AV_CODEC_ID_BFI,
317 AV_CODEC_ID_CMV,
318 AV_CODEC_ID_MOTIONPIXELS,
319 AV_CODEC_ID_TGV,
320 AV_CODEC_ID_TGQ,
321 AV_CODEC_ID_TQI,
322 AV_CODEC_ID_AURA,
323 AV_CODEC_ID_AURA2,
324 AV_CODEC_ID_V210X,
325 AV_CODEC_ID_TMV,
326 AV_CODEC_ID_V210,
327 AV_CODEC_ID_DPX,
328 AV_CODEC_ID_MAD,
329 AV_CODEC_ID_FRWU,
330 AV_CODEC_ID_FLASHSV2,
331 AV_CODEC_ID_CDGRAPHICS,
332 AV_CODEC_ID_R210,
333 AV_CODEC_ID_ANM,
334 AV_CODEC_ID_BINKVIDEO,
335 AV_CODEC_ID_IFF_ILBM,
336 AV_CODEC_ID_IFF_BYTERUN1,
337 AV_CODEC_ID_KGV1,
338 AV_CODEC_ID_YOP,
339 AV_CODEC_ID_VP8,
340 AV_CODEC_ID_PICTOR,
341 AV_CODEC_ID_ANSI,
342 AV_CODEC_ID_A64_MULTI,
343 AV_CODEC_ID_A64_MULTI5,
344 AV_CODEC_ID_R10K,
345 AV_CODEC_ID_MXPEG,
346 AV_CODEC_ID_LAGARITH,
347 AV_CODEC_ID_PRORES,
348 AV_CODEC_ID_JV,
349 AV_CODEC_ID_DFA,
350 AV_CODEC_ID_WMV3IMAGE,
351 AV_CODEC_ID_VC1IMAGE,
352 AV_CODEC_ID_UTVIDEO,
353 AV_CODEC_ID_BMV_VIDEO,
354 AV_CODEC_ID_VBLE,
355 AV_CODEC_ID_DXTORY,
356 AV_CODEC_ID_V410,
357 AV_CODEC_ID_XWD,
358 AV_CODEC_ID_CDXL,
359 AV_CODEC_ID_XBM,
360 AV_CODEC_ID_ZEROCODEC,
361 AV_CODEC_ID_MSS1,
362 AV_CODEC_ID_MSA1,
363 AV_CODEC_ID_TSCC2,
364 AV_CODEC_ID_MTS2,
365 AV_CODEC_ID_CLLC,
366 AV_CODEC_ID_MSS2,
367 AV_CODEC_ID_VP9,
368 AV_CODEC_ID_AIC,
369 AV_CODEC_ID_ESCAPE130,
370 AV_CODEC_ID_G2M,
371 AV_CODEC_ID_WEBP,
372 AV_CODEC_ID_HNM4_VIDEO,
373 AV_CODEC_ID_HEVC,
374 AV_CODEC_ID_FIC,
375 AV_CODEC_ID_ALIAS_PIX,
376 AV_CODEC_ID_BRENDER_PIX,
377 AV_CODEC_ID_PAF_VIDEO,
378 AV_CODEC_ID_EXR,
379 AV_CODEC_ID_VP7,
380 AV_CODEC_ID_SANM,
381 AV_CODEC_ID_SGIRLE,
382 AV_CODEC_ID_MVC1,
383 AV_CODEC_ID_MVC2,
384 AV_CODEC_ID_HQX,
385 AV_CODEC_ID_TDSC,
386 AV_CODEC_ID_HQ_HQA,
387 AV_CODEC_ID_HAP,
388 AV_CODEC_ID_DDS,
389 AV_CODEC_ID_DXV,
390 AV_CODEC_ID_SCREENPRESSO,
391 AV_CODEC_ID_RSCC,
392 AV_CODEC_ID_MAGICYUV,
393 AV_CODEC_ID_TRUEMOTION2RT,
394 AV_CODEC_ID_AV1,
395
396 /* various PCM "codecs" */
397 AV_CODEC_ID_FIRST_AUDIO = 0x10000, ///< A dummy id pointing at the start of audio codecs
398 AV_CODEC_ID_PCM_S16LE = 0x10000,
399 AV_CODEC_ID_PCM_S16BE,
400 AV_CODEC_ID_PCM_U16LE,
401 AV_CODEC_ID_PCM_U16BE,
402 AV_CODEC_ID_PCM_S8,
403 AV_CODEC_ID_PCM_U8,
404 AV_CODEC_ID_PCM_MULAW,
405 AV_CODEC_ID_PCM_ALAW,
406 AV_CODEC_ID_PCM_S32LE,
407 AV_CODEC_ID_PCM_S32BE,
408 AV_CODEC_ID_PCM_U32LE,
409 AV_CODEC_ID_PCM_U32BE,
410 AV_CODEC_ID_PCM_S24LE,
411 AV_CODEC_ID_PCM_S24BE,
412 AV_CODEC_ID_PCM_U24LE,
413 AV_CODEC_ID_PCM_U24BE,
414 AV_CODEC_ID_PCM_S24DAUD,
415 AV_CODEC_ID_PCM_ZORK,
416 AV_CODEC_ID_PCM_S16LE_PLANAR,
417 AV_CODEC_ID_PCM_DVD,
418 AV_CODEC_ID_PCM_F32BE,
419 AV_CODEC_ID_PCM_F32LE,
420 AV_CODEC_ID_PCM_F64BE,
421 AV_CODEC_ID_PCM_F64LE,
422 AV_CODEC_ID_PCM_BLURAY,
423 AV_CODEC_ID_PCM_LXF,
424 AV_CODEC_ID_S302M,
425 AV_CODEC_ID_PCM_S8_PLANAR,
426 AV_CODEC_ID_PCM_S24LE_PLANAR,
427 AV_CODEC_ID_PCM_S32LE_PLANAR,
428 AV_CODEC_ID_PCM_S16BE_PLANAR,
429
430 /* various ADPCM codecs */
431 AV_CODEC_ID_ADPCM_IMA_QT = 0x11000,
432 AV_CODEC_ID_ADPCM_IMA_WAV,
433 AV_CODEC_ID_ADPCM_IMA_DK3,
434 AV_CODEC_ID_ADPCM_IMA_DK4,
435 AV_CODEC_ID_ADPCM_IMA_WS,
436 AV_CODEC_ID_ADPCM_IMA_SMJPEG,
437 AV_CODEC_ID_ADPCM_MS,
438 AV_CODEC_ID_ADPCM_4XM,
439 AV_CODEC_ID_ADPCM_XA,
440 AV_CODEC_ID_ADPCM_ADX,
441 AV_CODEC_ID_ADPCM_EA,
442 AV_CODEC_ID_ADPCM_G726,
443 AV_CODEC_ID_ADPCM_CT,
444 AV_CODEC_ID_ADPCM_SWF,
445 AV_CODEC_ID_ADPCM_YAMAHA,
446 AV_CODEC_ID_ADPCM_SBPRO_4,
447 AV_CODEC_ID_ADPCM_SBPRO_3,
448 AV_CODEC_ID_ADPCM_SBPRO_2,
449 AV_CODEC_ID_ADPCM_THP,
450 AV_CODEC_ID_ADPCM_IMA_AMV,
451 AV_CODEC_ID_ADPCM_EA_R1,
452 AV_CODEC_ID_ADPCM_EA_R3,
453 AV_CODEC_ID_ADPCM_EA_R2,
454 AV_CODEC_ID_ADPCM_IMA_EA_SEAD,
455 AV_CODEC_ID_ADPCM_IMA_EA_EACS,
456 AV_CODEC_ID_ADPCM_EA_XAS,
457 AV_CODEC_ID_ADPCM_EA_MAXIS_XA,
458 AV_CODEC_ID_ADPCM_IMA_ISS,
459 AV_CODEC_ID_ADPCM_G722,
460 AV_CODEC_ID_ADPCM_IMA_APC,
461 AV_CODEC_ID_ADPCM_VIMA,
462
463 /* AMR */
464 AV_CODEC_ID_AMR_NB = 0x12000,
465 AV_CODEC_ID_AMR_WB,
466
467 /* RealAudio codecs*/
468 AV_CODEC_ID_RA_144 = 0x13000,
469 AV_CODEC_ID_RA_288,
470
471 /* various DPCM codecs */
472 AV_CODEC_ID_ROQ_DPCM = 0x14000,
473 AV_CODEC_ID_INTERPLAY_DPCM,
474 AV_CODEC_ID_XAN_DPCM,
475 AV_CODEC_ID_SOL_DPCM,
476
477 /* audio codecs */
478 AV_CODEC_ID_MP2 = 0x15000,
479 AV_CODEC_ID_MP3, ///< preferred ID for decoding MPEG audio layer 1, 2 or 3
480 AV_CODEC_ID_AAC,
481 AV_CODEC_ID_AC3,
482 AV_CODEC_ID_DTS,
483 AV_CODEC_ID_VORBIS,
484 AV_CODEC_ID_DVAUDIO,
485 AV_CODEC_ID_WMAV1,
486 AV_CODEC_ID_WMAV2,
487 AV_CODEC_ID_MACE3,
488 AV_CODEC_ID_MACE6,
489 AV_CODEC_ID_VMDAUDIO,
490 AV_CODEC_ID_FLAC,
491 AV_CODEC_ID_MP3ADU,
492 AV_CODEC_ID_MP3ON4,
493 AV_CODEC_ID_SHORTEN,
494 AV_CODEC_ID_ALAC,
495 AV_CODEC_ID_WESTWOOD_SND1,
496 AV_CODEC_ID_GSM, ///< as in Berlin toast format
497 AV_CODEC_ID_QDM2,
498 AV_CODEC_ID_COOK,
499 AV_CODEC_ID_TRUESPEECH,
500 AV_CODEC_ID_TTA,
501 AV_CODEC_ID_SMACKAUDIO,
502 AV_CODEC_ID_QCELP,
503 AV_CODEC_ID_WAVPACK,
504 AV_CODEC_ID_DSICINAUDIO,
505 AV_CODEC_ID_IMC,
506 AV_CODEC_ID_MUSEPACK7,
507 AV_CODEC_ID_MLP,
508 AV_CODEC_ID_GSM_MS, /* as found in WAV */
509 AV_CODEC_ID_ATRAC3,
510 #if FF_API_VOXWARE
511 AV_CODEC_ID_VOXWARE,
512 #endif
513 AV_CODEC_ID_APE,
514 AV_CODEC_ID_NELLYMOSER,
515 AV_CODEC_ID_MUSEPACK8,
516 AV_CODEC_ID_SPEEX,
517 AV_CODEC_ID_WMAVOICE,
518 AV_CODEC_ID_WMAPRO,
519 AV_CODEC_ID_WMALOSSLESS,
520 AV_CODEC_ID_ATRAC3P,
521 AV_CODEC_ID_EAC3,
522 AV_CODEC_ID_SIPR,
523 AV_CODEC_ID_MP1,
524 AV_CODEC_ID_TWINVQ,
525 AV_CODEC_ID_TRUEHD,
526 AV_CODEC_ID_MP4ALS,
527 AV_CODEC_ID_ATRAC1,
528 AV_CODEC_ID_BINKAUDIO_RDFT,
529 AV_CODEC_ID_BINKAUDIO_DCT,
530 AV_CODEC_ID_AAC_LATM,
531 AV_CODEC_ID_QDMC,
532 AV_CODEC_ID_CELT,
533 AV_CODEC_ID_G723_1,
534 AV_CODEC_ID_G729,
535 AV_CODEC_ID_8SVX_EXP,
536 AV_CODEC_ID_8SVX_FIB,
537 AV_CODEC_ID_BMV_AUDIO,
538 AV_CODEC_ID_RALF,
539 AV_CODEC_ID_IAC,
540 AV_CODEC_ID_ILBC,
541 AV_CODEC_ID_OPUS,
542 AV_CODEC_ID_COMFORT_NOISE,
543 AV_CODEC_ID_TAK,
544 AV_CODEC_ID_METASOUND,
545 AV_CODEC_ID_PAF_AUDIO,
546 AV_CODEC_ID_ON2AVC,
547 AV_CODEC_ID_DSS_SP,
548
549 /* subtitle codecs */
550 AV_CODEC_ID_FIRST_SUBTITLE = 0x17000, ///< A dummy ID pointing at the start of subtitle codecs.
551 AV_CODEC_ID_DVD_SUBTITLE = 0x17000,
552 AV_CODEC_ID_DVB_SUBTITLE,
553 AV_CODEC_ID_TEXT, ///< raw UTF-8 text
554 AV_CODEC_ID_XSUB,
555 AV_CODEC_ID_SSA,
556 AV_CODEC_ID_MOV_TEXT,
557 AV_CODEC_ID_HDMV_PGS_SUBTITLE,
558 AV_CODEC_ID_DVB_TELETEXT,
559 AV_CODEC_ID_SRT,
560
561 /* other specific kind of codecs (generally used for attachments) */
562 AV_CODEC_ID_FIRST_UNKNOWN = 0x18000, ///< A dummy ID pointing at the start of various fake codecs.
563 AV_CODEC_ID_TTF = 0x18000,
564
565 AV_CODEC_ID_PROBE = 0x19000, ///< codec_id is not known (like AV_CODEC_ID_NONE) but lavf should attempt to identify it
566
567 AV_CODEC_ID_MPEG2TS = 0x20000, /**< _FAKE_ codec to indicate a raw MPEG-2 TS
568 * stream (only used by libavformat) */
569 AV_CODEC_ID_MPEG4SYSTEMS = 0x20001, /**< _FAKE_ codec to indicate a MPEG-4 Systems
570 * stream (only used by libavformat) */
571 AV_CODEC_ID_FFMETADATA = 0x21000, ///< Dummy codec for streams containing only metadata information.
572 AV_CODEC_ID_WRAPPED_AVFRAME = 0x21001, ///< Passthrough codec, AVFrames wrapped in AVPacket
573 };
574
575 /**
576 * This struct describes the properties of a single codec described by an
577 * AVCodecID.
578 * @see avcodec_descriptor_get()
579 */
580 typedef struct AVCodecDescriptor {
581 enum AVCodecID id;
582 enum AVMediaType type;
583 /**
584 * Name of the codec described by this descriptor. It is non-empty and
585 * unique for each codec descriptor. It should contain alphanumeric
586 * characters and '_' only.
587 */
588 const char *name;
589 /**
590 * A more descriptive name for this codec. May be NULL.
591 */
592 const char *long_name;
593 /**
594 * Codec properties, a combination of AV_CODEC_PROP_* flags.
595 */
596 int props;
597 /**
598 * If non-NULL, an array of profiles recognized for this codec.
599 * Terminated with FF_PROFILE_UNKNOWN.
600 */
601 const struct AVProfile *profiles;
602 } AVCodecDescriptor;
603
604 /**
605 * Codec uses only intra compression.
606 * Video codecs only.
607 */
608 #define AV_CODEC_PROP_INTRA_ONLY (1 << 0)
609 /**
610 * Codec supports lossy compression. Audio and video codecs only.
611 * @note a codec may support both lossy and lossless
612 * compression modes
613 */
614 #define AV_CODEC_PROP_LOSSY (1 << 1)
615 /**
616 * Codec supports lossless compression. Audio and video codecs only.
617 */
618 #define AV_CODEC_PROP_LOSSLESS (1 << 2)
619 /**
620 * Codec supports frame reordering. That is, the coded order (the order in which
621 * the encoded packets are output by the encoders / stored / input to the
622 * decoders) may be different from the presentation order of the corresponding
623 * frames.
624 *
625 * For codecs that do not have this property set, PTS and DTS should always be
626 * equal.
627 */
628 #define AV_CODEC_PROP_REORDER (1 << 3)
629
630 /**
631 * @ingroup lavc_decoding
632 * Required number of additionally allocated bytes at the end of the input bitstream for decoding.
633 * This is mainly needed because some optimized bitstream readers read
634 * 32 or 64 bit at once and could read over the end.<br>
635 * Note: If the first 23 bits of the additional bytes are not 0, then damaged
636 * MPEG bitstreams could cause overread and segfault.
637 */
638 #define AV_INPUT_BUFFER_PADDING_SIZE 8
639
640 /**
641 * @ingroup lavc_encoding
642 * minimum encoding buffer size
643 * Used to avoid some checks during header writing.
644 */
645 #define AV_INPUT_BUFFER_MIN_SIZE 16384
646
647 #if FF_API_WITHOUT_PREFIX
648 /**
649 * @deprecated use AV_INPUT_BUFFER_PADDING_SIZE instead
650 */
651 #define FF_INPUT_BUFFER_PADDING_SIZE 8
652
653 /**
654 * @deprecated use AV_INPUT_BUFFER_MIN_SIZE instead
655 */
656 #define FF_MIN_BUFFER_SIZE 16384
657 #endif /* FF_API_WITHOUT_PREFIX */
658
659 /**
660 * @ingroup lavc_encoding
661 * motion estimation type.
662 * @deprecated use codec private option instead
663 */
664 #if FF_API_MOTION_EST
665 enum Motion_Est_ID {
666 ME_ZERO = 1, ///< no search, that is use 0,0 vector whenever one is needed
667 ME_FULL,
668 ME_LOG,
669 ME_PHODS,
670 ME_EPZS, ///< enhanced predictive zonal search
671 ME_X1, ///< reserved for experiments
672 ME_HEX, ///< hexagon based search
673 ME_UMH, ///< uneven multi-hexagon search
674 ME_TESA, ///< transformed exhaustive search algorithm
675 };
676 #endif
677
678 /**
679 * @ingroup lavc_decoding
680 */
681 enum AVDiscard{
682 /* We leave some space between them for extensions (drop some
683 * keyframes for intra-only or drop just some bidir frames). */
684 AVDISCARD_NONE =-16, ///< discard nothing
685 AVDISCARD_DEFAULT = 0, ///< discard useless packets like 0 size packets in avi
686 AVDISCARD_NONREF = 8, ///< discard all non reference
687 AVDISCARD_BIDIR = 16, ///< discard all bidirectional frames
688 AVDISCARD_NONKEY = 32, ///< discard all frames except keyframes
689 AVDISCARD_ALL = 48, ///< discard all
690 };
691
692 enum AVAudioServiceType {
693 AV_AUDIO_SERVICE_TYPE_MAIN = 0,
694 AV_AUDIO_SERVICE_TYPE_EFFECTS = 1,
695 AV_AUDIO_SERVICE_TYPE_VISUALLY_IMPAIRED = 2,
696 AV_AUDIO_SERVICE_TYPE_HEARING_IMPAIRED = 3,
697 AV_AUDIO_SERVICE_TYPE_DIALOGUE = 4,
698 AV_AUDIO_SERVICE_TYPE_COMMENTARY = 5,
699 AV_AUDIO_SERVICE_TYPE_EMERGENCY = 6,
700 AV_AUDIO_SERVICE_TYPE_VOICE_OVER = 7,
701 AV_AUDIO_SERVICE_TYPE_KARAOKE = 8,
702 AV_AUDIO_SERVICE_TYPE_NB , ///< Not part of ABI
703 };
704
705 /**
706 * @ingroup lavc_encoding
707 */
708 typedef struct RcOverride{
709 int start_frame;
710 int end_frame;
711 int qscale; // If this is 0 then quality_factor will be used instead.
712 float quality_factor;
713 } RcOverride;
714
715 #if FF_API_MAX_BFRAMES
716 /**
717 * @deprecated there is no libavcodec-wide limit on the number of B-frames
718 */
719 #define FF_MAX_B_FRAMES 16
720 #endif
721
722 /* encoding support
723 These flags can be passed in AVCodecContext.flags before initialization.
724 Note: Not everything is supported yet.
725 */
726
727 /**
728 * Allow decoders to produce frames with data planes that are not aligned
729 * to CPU requirements (e.g. due to cropping).
730 */
731 #define AV_CODEC_FLAG_UNALIGNED (1 << 0)
732 /**
733 * Use fixed qscale.
734 */
735 #define AV_CODEC_FLAG_QSCALE (1 << 1)
736 /**
737 * 4 MV per MB allowed / advanced prediction for H.263.
738 */
739 #define AV_CODEC_FLAG_4MV (1 << 2)
740 /**
741 * Output even those frames that might be corrupted.
742 */
743 #define AV_CODEC_FLAG_OUTPUT_CORRUPT (1 << 3)
744 /**
745 * Use qpel MC.
746 */
747 #define AV_CODEC_FLAG_QPEL (1 << 4)
748 /**
749 * Use internal 2pass ratecontrol in first pass mode.
750 */
751 #define AV_CODEC_FLAG_PASS1 (1 << 9)
752 /**
753 * Use internal 2pass ratecontrol in second pass mode.
754 */
755 #define AV_CODEC_FLAG_PASS2 (1 << 10)
756 /**
757 * loop filter.
758 */
759 #define AV_CODEC_FLAG_LOOP_FILTER (1 << 11)
760 /**
761 * Only decode/encode grayscale.
762 */
763 #define AV_CODEC_FLAG_GRAY (1 << 13)
764 /**
765 * error[?] variables will be set during encoding.
766 */
767 #define AV_CODEC_FLAG_PSNR (1 << 15)
768 /**
769 * Input bitstream might be truncated at a random location
770 * instead of only at frame boundaries.
771 */
772 #define AV_CODEC_FLAG_TRUNCATED (1 << 16)
773 /**
774 * Use interlaced DCT.
775 */
776 #define AV_CODEC_FLAG_INTERLACED_DCT (1 << 18)
777 /**
778 * Force low delay.
779 */
780 #define AV_CODEC_FLAG_LOW_DELAY (1 << 19)
781 /**
782 * Place global headers in extradata instead of every keyframe.
783 */
784 #define AV_CODEC_FLAG_GLOBAL_HEADER (1 << 22)
785 /**
786 * Use only bitexact stuff (except (I)DCT).
787 */
788 #define AV_CODEC_FLAG_BITEXACT (1 << 23)
789 /* Fx : Flag for H.263+ extra options */
790 /**
791 * H.263 advanced intra coding / MPEG-4 AC prediction
792 */
793 #define AV_CODEC_FLAG_AC_PRED (1 << 24)
794 /**
795 * interlaced motion estimation
796 */
797 #define AV_CODEC_FLAG_INTERLACED_ME (1 << 29)
798 #define AV_CODEC_FLAG_CLOSED_GOP (1 << 31)
799
800 /**
801 * Allow non spec compliant speedup tricks.
802 */
803 #define AV_CODEC_FLAG2_FAST (1 << 0)
804 /**
805 * Skip bitstream encoding.
806 */
807 #define AV_CODEC_FLAG2_NO_OUTPUT (1 << 2)
808 /**
809 * Place global headers at every keyframe instead of in extradata.
810 */
811 #define AV_CODEC_FLAG2_LOCAL_HEADER (1 << 3)
812 /**
813 * Input bitstream might be truncated at a packet boundaries
814 * instead of only at frame boundaries.
815 */
816 #define AV_CODEC_FLAG2_CHUNKS (1 << 15)
817 /**
818 * Discard cropping information from SPS.
819 */
820 #define AV_CODEC_FLAG2_IGNORE_CROP (1 << 16)
821
822 /* Unsupported options :
823 * Syntax Arithmetic coding (SAC)
824 * Reference Picture Selection
825 * Independent Segment Decoding */
826 /* /Fx */
827 /* codec capabilities */
828
829 /**
830 * Decoder can use draw_horiz_band callback.
831 */
832 #define AV_CODEC_CAP_DRAW_HORIZ_BAND (1 << 0)
833 /**
834 * Codec uses get_buffer() for allocating buffers and supports custom allocators.
835 * If not set, it might not use get_buffer() at all or use operations that
836 * assume the buffer was allocated by avcodec_default_get_buffer.
837 */
838 #define AV_CODEC_CAP_DR1 (1 << 1)
839 #define AV_CODEC_CAP_TRUNCATED (1 << 3)
840 /**
841 * Encoder or decoder requires flushing with NULL input at the end in order to
842 * give the complete and correct output.
843 *
844 * NOTE: If this flag is not set, the codec is guaranteed to never be fed with
845 * with NULL data. The user can still send NULL data to the public encode
846 * or decode function, but libavcodec will not pass it along to the codec
847 * unless this flag is set.
848 *
849 * Decoders:
850 * The decoder has a non-zero delay and needs to be fed with avpkt->data=NULL,
851 * avpkt->size=0 at the end to get the delayed data until the decoder no longer
852 * returns frames.
853 *
854 * Encoders:
855 * The encoder needs to be fed with NULL data at the end of encoding until the
856 * encoder no longer returns data.
857 *
858 * NOTE: For encoders implementing the AVCodec.encode2() function, setting this
859 * flag also means that the encoder must set the pts and duration for
860 * each output packet. If this flag is not set, the pts and duration will
861 * be determined by libavcodec from the input frame.
862 */
863 #define AV_CODEC_CAP_DELAY (1 << 5)
864 /**
865 * Codec can be fed a final frame with a smaller size.
866 * This can be used to prevent truncation of the last audio samples.
867 */
868 #define AV_CODEC_CAP_SMALL_LAST_FRAME (1 << 6)
869 /**
870 * Codec can output multiple frames per AVPacket
871 * Normally demuxers return one frame at a time, demuxers which do not do
872 * are connected to a parser to split what they return into proper frames.
873 * This flag is reserved to the very rare category of codecs which have a
874 * bitstream that cannot be split into frames without timeconsuming
875 * operations like full decoding. Demuxers carrying such bitstreams thus
876 * may return multiple frames in a packet. This has many disadvantages like
877 * prohibiting stream copy in many cases thus it should only be considered
878 * as a last resort.
879 */
880 #define AV_CODEC_CAP_SUBFRAMES (1 << 8)
881 /**
882 * Codec is experimental and is thus avoided in favor of non experimental
883 * encoders
884 */
885 #define AV_CODEC_CAP_EXPERIMENTAL (1 << 9)
886 /**
887 * Codec should fill in channel configuration and samplerate instead of container
888 */
889 #define AV_CODEC_CAP_CHANNEL_CONF (1 << 10)
890 /**
891 * Codec supports frame-level multithreading.
892 */
893 #define AV_CODEC_CAP_FRAME_THREADS (1 << 12)
894 /**
895 * Codec supports slice-based (or partition-based) multithreading.
896 */
897 #define AV_CODEC_CAP_SLICE_THREADS (1 << 13)
898 /**
899 * Codec supports changed parameters at any point.
900 */
901 #define AV_CODEC_CAP_PARAM_CHANGE (1 << 14)
902 /**
903 * Codec supports avctx->thread_count == 0 (auto).
904 */
905 #define AV_CODEC_CAP_AUTO_THREADS (1 << 15)
906 /**
907 * Audio encoder supports receiving a different number of samples in each call.
908 */
909 #define AV_CODEC_CAP_VARIABLE_FRAME_SIZE (1 << 16)
910
911 #if FF_API_WITHOUT_PREFIX
912 /**
913 * Allow decoders to produce frames with data planes that are not aligned
914 * to CPU requirements (e.g. due to cropping).
915 */
916 #define CODEC_FLAG_UNALIGNED 0x0001
917 #define CODEC_FLAG_QSCALE 0x0002 ///< Use fixed qscale.
918 #define CODEC_FLAG_4MV 0x0004 ///< 4 MV per MB allowed / advanced prediction for H.263.
919 #define CODEC_FLAG_OUTPUT_CORRUPT 0x0008 ///< Output even those frames that might be corrupted
920 #define CODEC_FLAG_QPEL 0x0010 ///< Use qpel MC.
921 #if FF_API_GMC
922 /**
923 * @deprecated use the "gmc" private option of the libxvid encoder
924 */
925 #define CODEC_FLAG_GMC 0x0020 ///< Use GMC.
926 #endif
927 #if FF_API_MV0
928 /**
929 * @deprecated use the flag "mv0" in the "mpv_flags" private option of the
930 * mpegvideo encoders
931 */
932 #define CODEC_FLAG_MV0 0x0040
933 #endif
934 #if FF_API_INPUT_PRESERVED
935 /**
936 * @deprecated passing reference-counted frames to the encoders replaces this
937 * flag
938 */
939 #define CODEC_FLAG_INPUT_PRESERVED 0x0100
940 #endif
941 #define CODEC_FLAG_PASS1 0x0200 ///< Use internal 2pass ratecontrol in first pass mode.
942 #define CODEC_FLAG_PASS2 0x0400 ///< Use internal 2pass ratecontrol in second pass mode.
943 #define CODEC_FLAG_GRAY 0x2000 ///< Only decode/encode grayscale.
944 #if FF_API_EMU_EDGE
945 /**
946 * @deprecated edges are not used/required anymore. I.e. this flag is now always
947 * set.
948 */
949 #define CODEC_FLAG_EMU_EDGE 0x4000
950 #endif
951 #define CODEC_FLAG_PSNR 0x8000 ///< error[?] variables will be set during encoding.
952 #define CODEC_FLAG_TRUNCATED 0x00010000 /** Input bitstream might be truncated at a random
953 location instead of only at frame boundaries. */
954 #if FF_API_NORMALIZE_AQP
955 /**
956 * @deprecated use the flag "naq" in the "mpv_flags" private option of the
957 * mpegvideo encoders
958 */
959 #define CODEC_FLAG_NORMALIZE_AQP 0x00020000
960 #endif
961 #define CODEC_FLAG_INTERLACED_DCT 0x00040000 ///< Use interlaced DCT.
962 #define CODEC_FLAG_LOW_DELAY 0x00080000 ///< Force low delay.
963 #define CODEC_FLAG_GLOBAL_HEADER 0x00400000 ///< Place global headers in extradata instead of every keyframe.
964 #define CODEC_FLAG_BITEXACT 0x00800000 ///< Use only bitexact stuff (except (I)DCT).
965 /* Fx : Flag for H.263+ extra options */
966 #define CODEC_FLAG_AC_PRED 0x01000000 ///< H.263 advanced intra coding / MPEG-4 AC prediction
967 #define CODEC_FLAG_LOOP_FILTER 0x00000800 ///< loop filter
968 #define CODEC_FLAG_INTERLACED_ME 0x20000000 ///< interlaced motion estimation
969 #define CODEC_FLAG_CLOSED_GOP 0x80000000
970 #define CODEC_FLAG2_FAST 0x00000001 ///< Allow non spec compliant speedup tricks.
971 #define CODEC_FLAG2_NO_OUTPUT 0x00000004 ///< Skip bitstream encoding.
972 #define CODEC_FLAG2_LOCAL_HEADER 0x00000008 ///< Place global headers at every keyframe instead of in extradata.
973 #define CODEC_FLAG2_IGNORE_CROP 0x00010000 ///< Discard cropping information from SPS.
974
975 #define CODEC_FLAG2_CHUNKS 0x00008000 ///< Input bitstream might be truncated at a packet boundaries instead of only at frame boundaries.
976
977 /* Unsupported options :
978 * Syntax Arithmetic coding (SAC)
979 * Reference Picture Selection
980 * Independent Segment Decoding */
981 /* /Fx */
982 /* codec capabilities */
983
984 #define CODEC_CAP_DRAW_HORIZ_BAND 0x0001 ///< Decoder can use draw_horiz_band callback.
985 /**
986 * Codec uses get_buffer() for allocating buffers and supports custom allocators.
987 * If not set, it might not use get_buffer() at all or use operations that
988 * assume the buffer was allocated by avcodec_default_get_buffer.
989 */
990 #define CODEC_CAP_DR1 0x0002
991 #define CODEC_CAP_TRUNCATED 0x0008
992 #if FF_API_XVMC
993 /* Codec can export data for HW decoding (XvMC). */
994 #define CODEC_CAP_HWACCEL 0x0010
995 #endif /* FF_API_XVMC */
996 /**
997 * Encoder or decoder requires flushing with NULL input at the end in order to
998 * give the complete and correct output.
999 *
1000 * NOTE: If this flag is not set, the codec is guaranteed to never be fed with
1001 * with NULL data. The user can still send NULL data to the public encode
1002 * or decode function, but libavcodec will not pass it along to the codec
1003 * unless this flag is set.
1004 *
1005 * Decoders:
1006 * The decoder has a non-zero delay and needs to be fed with avpkt->data=NULL,
1007 * avpkt->size=0 at the end to get the delayed data until the decoder no longer
1008 * returns frames.
1009 *
1010 * Encoders:
1011 * The encoder needs to be fed with NULL data at the end of encoding until the
1012 * encoder no longer returns data.
1013 *
1014 * NOTE: For encoders implementing the AVCodec.encode2() function, setting this
1015 * flag also means that the encoder must set the pts and duration for
1016 * each output packet. If this flag is not set, the pts and duration will
1017 * be determined by libavcodec from the input frame.
1018 */
1019 #define CODEC_CAP_DELAY 0x0020
1020 /**
1021 * Codec can be fed a final frame with a smaller size.
1022 * This can be used to prevent truncation of the last audio samples.
1023 */
1024 #define CODEC_CAP_SMALL_LAST_FRAME 0x0040
1025 #if FF_API_CAP_VDPAU
1026 /**
1027 * Codec can export data for HW decoding (VDPAU).
1028 */
1029 #define CODEC_CAP_HWACCEL_VDPAU 0x0080
1030 #endif
1031 /**
1032 * Codec can output multiple frames per AVPacket
1033 * Normally demuxers return one frame at a time, demuxers which do not do
1034 * are connected to a parser to split what they return into proper frames.
1035 * This flag is reserved to the very rare category of codecs which have a
1036 * bitstream that cannot be split into frames without timeconsuming
1037 * operations like full decoding. Demuxers carrying such bitstreams thus
1038 * may return multiple frames in a packet. This has many disadvantages like
1039 * prohibiting stream copy in many cases thus it should only be considered
1040 * as a last resort.
1041 */
1042 #define CODEC_CAP_SUBFRAMES 0x0100
1043 /**
1044 * Codec is experimental and is thus avoided in favor of non experimental
1045 * encoders
1046 */
1047 #define CODEC_CAP_EXPERIMENTAL 0x0200
1048 /**
1049 * Codec should fill in channel configuration and samplerate instead of container
1050 */
1051 #define CODEC_CAP_CHANNEL_CONF 0x0400
1052 #if FF_API_NEG_LINESIZES
1053 /**
1054 * @deprecated no codecs use this capability
1055 */
1056 #define CODEC_CAP_NEG_LINESIZES 0x0800
1057 #endif
1058 /**
1059 * Codec supports frame-level multithreading.
1060 */
1061 #define CODEC_CAP_FRAME_THREADS 0x1000
1062 /**
1063 * Codec supports slice-based (or partition-based) multithreading.
1064 */
1065 #define CODEC_CAP_SLICE_THREADS 0x2000
1066 /**
1067 * Codec supports changed parameters at any point.
1068 */
1069 #define CODEC_CAP_PARAM_CHANGE 0x4000
1070 /**
1071 * Codec supports avctx->thread_count == 0 (auto).
1072 */
1073 #define CODEC_CAP_AUTO_THREADS 0x8000
1074 /**
1075 * Audio encoder supports receiving a different number of samples in each call.
1076 */
1077 #define CODEC_CAP_VARIABLE_FRAME_SIZE 0x10000
1078 #endif /* FF_API_WITHOUT_PREFIX */
1079
1080 #if FF_API_MB_TYPE
1081 //The following defines may change, don't expect compatibility if you use them.
1082 #define MB_TYPE_INTRA4x4 0x0001
1083 #define MB_TYPE_INTRA16x16 0x0002 //FIXME H.264-specific
1084 #define MB_TYPE_INTRA_PCM 0x0004 //FIXME H.264-specific
1085 #define MB_TYPE_16x16 0x0008
1086 #define MB_TYPE_16x8 0x0010
1087 #define MB_TYPE_8x16 0x0020
1088 #define MB_TYPE_8x8 0x0040
1089 #define MB_TYPE_INTERLACED 0x0080
1090 #define MB_TYPE_DIRECT2 0x0100 //FIXME
1091 #define MB_TYPE_ACPRED 0x0200
1092 #define MB_TYPE_GMC 0x0400
1093 #define MB_TYPE_SKIP 0x0800
1094 #define MB_TYPE_P0L0 0x1000
1095 #define MB_TYPE_P1L0 0x2000
1096 #define MB_TYPE_P0L1 0x4000
1097 #define MB_TYPE_P1L1 0x8000
1098 #define MB_TYPE_L0 (MB_TYPE_P0L0 | MB_TYPE_P1L0)
1099 #define MB_TYPE_L1 (MB_TYPE_P0L1 | MB_TYPE_P1L1)
1100 #define MB_TYPE_L0L1 (MB_TYPE_L0 | MB_TYPE_L1)
1101 #define MB_TYPE_QUANT 0x00010000
1102 #define MB_TYPE_CBP 0x00020000
1103 // Note bits 24-31 are reserved for codec specific use (H.264 ref0, MPEG-1 0mv, ...)
1104 #endif
1105
1106 /**
1107 * Pan Scan area.
1108 * This specifies the area which should be displayed.
1109 * Note there may be multiple such areas for one frame.
1110 */
1111 typedef struct AVPanScan{
1112 /**
1113 * id
1114 * - encoding: Set by user.
1115 * - decoding: Set by libavcodec.
1116 */
1117 int id;
1118
1119 /**
1120 * width and height in 1/16 pel
1121 * - encoding: Set by user.
1122 * - decoding: Set by libavcodec.
1123 */
1124 int width;
1125 int height;
1126
1127 /**
1128 * position of the top left corner in 1/16 pel for up to 3 fields/frames
1129 * - encoding: Set by user.
1130 * - decoding: Set by libavcodec.
1131 */
1132 int16_t position[3][2];
1133 }AVPanScan;
1134
1135 /**
1136 * This structure describes the bitrate properties of an encoded bitstream. It
1137 * roughly corresponds to a subset the VBV parameters for MPEG-2 or HRD
1138 * parameters for H.264/HEVC.
1139 */
1140 typedef struct AVCPBProperties {
1141 /**
1142 * Maximum bitrate of the stream, in bits per second.
1143 * Zero if unknown or unspecified.
1144 */
1145 int max_bitrate;
1146 /**
1147 * Minimum bitrate of the stream, in bits per second.
1148 * Zero if unknown or unspecified.
1149 */
1150 int min_bitrate;
1151 /**
1152 * Average bitrate of the stream, in bits per second.
1153 * Zero if unknown or unspecified.
1154 */
1155 int avg_bitrate;
1156
1157 /**
1158 * The size of the buffer to which the ratecontrol is applied, in bits.
1159 * Zero if unknown or unspecified.
1160 */
1161 int buffer_size;
1162
1163 /**
1164 * The delay between the time the packet this structure is associated with
1165 * is received and the time when it should be decoded, in periods of a 27MHz
1166 * clock.
1167 *
1168 * UINT64_MAX when unknown or unspecified.
1169 */
1170 uint64_t vbv_delay;
1171 } AVCPBProperties;
1172
1173 #if FF_API_QSCALE_TYPE
1174 #define FF_QSCALE_TYPE_MPEG1 0
1175 #define FF_QSCALE_TYPE_MPEG2 1
1176 #define FF_QSCALE_TYPE_H264 2
1177 #define FF_QSCALE_TYPE_VP56 3
1178 #endif
1179
1180 /**
1181 * The decoder will keep a reference to the frame and may reuse it later.
1182 */
1183 #define AV_GET_BUFFER_FLAG_REF (1 << 0)
1184
1185 /**
1186 * @defgroup lavc_packet AVPacket
1187 *
1188 * Types and functions for working with AVPacket.
1189 * @{
1190 */
1191 enum AVPacketSideDataType {
1192 AV_PKT_DATA_PALETTE,
1193
1194 /**
1195 * The AV_PKT_DATA_NEW_EXTRADATA is used to notify the codec or the format
1196 * that the extradata buffer was changed and the receiving side should
1197 * act upon it appropriately. The new extradata is embedded in the side
1198 * data buffer and should be immediately used for processing the current
1199 * frame or packet.
1200 */
1201 AV_PKT_DATA_NEW_EXTRADATA,
1202
1203 /**
1204 * An AV_PKT_DATA_PARAM_CHANGE side data packet is laid out as follows:
1205 * @code
1206 * u32le param_flags
1207 * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_COUNT)
1208 * s32le channel_count
1209 * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_LAYOUT)
1210 * u64le channel_layout
1211 * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_SAMPLE_RATE)
1212 * s32le sample_rate
1213 * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_DIMENSIONS)
1214 * s32le width
1215 * s32le height
1216 * @endcode
1217 */
1218 AV_PKT_DATA_PARAM_CHANGE,
1219
1220 /**
1221 * An AV_PKT_DATA_H263_MB_INFO side data packet contains a number of
1222 * structures with info about macroblocks relevant to splitting the
1223 * packet into smaller packets on macroblock edges (e.g. as for RFC 2190).
1224 * That is, it does not necessarily contain info about all macroblocks,
1225 * as long as the distance between macroblocks in the info is smaller
1226 * than the target payload size.
1227 * Each MB info structure is 12 bytes, and is laid out as follows:
1228 * @code
1229 * u32le bit offset from the start of the packet
1230 * u8 current quantizer at the start of the macroblock
1231 * u8 GOB number
1232 * u16le macroblock address within the GOB
1233 * u8 horizontal MV predictor
1234 * u8 vertical MV predictor
1235 * u8 horizontal MV predictor for block number 3
1236 * u8 vertical MV predictor for block number 3
1237 * @endcode
1238 */
1239 AV_PKT_DATA_H263_MB_INFO,
1240
1241 /**
1242 * This side data should be associated with an audio stream and contains
1243 * ReplayGain information in form of the AVReplayGain struct.
1244 */
1245 AV_PKT_DATA_REPLAYGAIN,
1246
1247 /**
1248 * This side data contains a 3x3 transformation matrix describing an affine
1249 * transformation that needs to be applied to the decoded video frames for
1250 * correct presentation.
1251 *
1252 * See libavutil/display.h for a detailed description of the data.
1253 */
1254 AV_PKT_DATA_DISPLAYMATRIX,
1255
1256 /**
1257 * This side data should be associated with a video stream and contains
1258 * Stereoscopic 3D information in form of the AVStereo3D struct.
1259 */
1260 AV_PKT_DATA_STEREO3D,
1261
1262 /**
1263 * This side data should be associated with an audio stream and corresponds
1264 * to enum AVAudioServiceType.
1265 */
1266 AV_PKT_DATA_AUDIO_SERVICE_TYPE,
1267
1268 /**
1269 * This side data contains an integer value representing the quality
1270 * factor of the compressed frame. Allowed range is between 1 (good)
1271 * and FF_LAMBDA_MAX (bad).
1272 */
1273 AV_PKT_DATA_QUALITY_FACTOR,
1274
1275 /**
1276 * This side data contains an integer value representing the stream index
1277 * of a "fallback" track. A fallback track indicates an alternate
1278 * track to use when the current track can not be decoded for some reason.
1279 * e.g. no decoder available for codec.
1280 */
1281 AV_PKT_DATA_FALLBACK_TRACK,
1282
1283 /**
1284 * This side data corresponds to the AVCPBProperties struct.
1285 */
1286 AV_PKT_DATA_CPB_PROPERTIES,
1287 };
1288
1289 typedef struct AVPacketSideData {
1290 uint8_t *data;
1291 int size;
1292 enum AVPacketSideDataType type;
1293 } AVPacketSideData;
1294
1295 /**
1296 * This structure stores compressed data. It is typically exported by demuxers
1297 * and then passed as input to decoders, or received as output from encoders and
1298 * then passed to muxers.
1299 *
1300 * For video, it should typically contain one compressed frame. For audio it may
1301 * contain several compressed frames. Encoders are allowed to output empty
1302 * packets, with no compressed data, containing only side data
1303 * (e.g. to update some stream parameters at the end of encoding).
1304 *
1305 * AVPacket is one of the few structs in Libav, whose size is a part of public
1306 * ABI. Thus it may be allocated on stack and no new fields can be added to it
1307 * without libavcodec and libavformat major bump.
1308 *
1309 * The semantics of data ownership depends on the buf field.
1310 * If it is set, the packet data is dynamically allocated and is
1311 * valid indefinitely until a call to av_packet_unref() reduces the
1312 * reference count to 0.
1313 *
1314 * If the buf field is not set av_packet_ref() would make a copy instead
1315 * of increasing the reference count.
1316 *
1317 * The side data is always allocated with av_malloc(), copied by
1318 * av_packet_ref() and freed by av_packet_unref().
1319 *
1320 * @see av_packet_ref
1321 * @see av_packet_unref
1322 */
1323 typedef struct AVPacket {
1324 /**
1325 * A reference to the reference-counted buffer where the packet data is
1326 * stored.
1327 * May be NULL, then the packet data is not reference-counted.
1328 */
1329 AVBufferRef *buf;
1330 /**
1331 * Presentation timestamp in AVStream->time_base units; the time at which
1332 * the decompressed packet will be presented to the user.
1333 * Can be AV_NOPTS_VALUE if it is not stored in the file.
1334 * pts MUST be larger or equal to dts as presentation cannot happen before
1335 * decompression, unless one wants to view hex dumps. Some formats misuse
1336 * the terms dts and pts/cts to mean something different. Such timestamps
1337 * must be converted to true pts/dts before they are stored in AVPacket.
1338 */
1339 int64_t pts;
1340 /**
1341 * Decompression timestamp in AVStream->time_base units; the time at which
1342 * the packet is decompressed.
1343 * Can be AV_NOPTS_VALUE if it is not stored in the file.
1344 */
1345 int64_t dts;
1346 uint8_t *data;
1347 int size;
1348 int stream_index;
1349 /**
1350 * A combination of AV_PKT_FLAG values
1351 */
1352 int flags;
1353 /**
1354 * Additional packet data that can be provided by the container.
1355 * Packet can contain several types of side information.
1356 */
1357 AVPacketSideData *side_data;
1358 int side_data_elems;
1359
1360 /**
1361 * Duration of this packet in AVStream->time_base units, 0 if unknown.
1362 * Equals next_pts - this_pts in presentation order.
1363 */
1364 int64_t duration;
1365
1366 int64_t pos; ///< byte position in stream, -1 if unknown
1367
1368 #if FF_API_CONVERGENCE_DURATION
1369 /**
1370 * @deprecated Same as the duration field, but as int64_t. This was required
1371 * for Matroska subtitles, whose duration values could overflow when the
1372 * duration field was still an int.
1373 */
1374 attribute_deprecated
1375 int64_t convergence_duration;
1376 #endif
1377 } AVPacket;
1378 #define AV_PKT_FLAG_KEY 0x0001 ///< The packet contains a keyframe
1379 #define AV_PKT_FLAG_CORRUPT 0x0002 ///< The packet content is corrupted
1380
1381 enum AVSideDataParamChangeFlags {
1382 AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_COUNT = 0x0001,
1383 AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_LAYOUT = 0x0002,
1384 AV_SIDE_DATA_PARAM_CHANGE_SAMPLE_RATE = 0x0004,
1385 AV_SIDE_DATA_PARAM_CHANGE_DIMENSIONS = 0x0008,
1386 };
1387 /**
1388 * @}
1389 */
1390
1391 struct AVCodecInternal;
1392
1393 enum AVFieldOrder {
1394 AV_FIELD_UNKNOWN,
1395 AV_FIELD_PROGRESSIVE,
1396 AV_FIELD_TT, //< Top coded_first, top displayed first
1397 AV_FIELD_BB, //< Bottom coded first, bottom displayed first
1398 AV_FIELD_TB, //< Top coded first, bottom displayed first
1399 AV_FIELD_BT, //< Bottom coded first, top displayed first
1400 };
1401
1402 /**
1403 * main external API structure.
1404 * New fields can be added to the end with minor version bumps.
1405 * Removal, reordering and changes to existing fields require a major
1406 * version bump.
1407 * sizeof(AVCodecContext) must not be used outside libav*.
1408 */
1409 typedef struct AVCodecContext {
1410 /**
1411 * information on struct for av_log
1412 * - set by avcodec_alloc_context3
1413 */
1414 const AVClass *av_class;
1415 int log_level_offset;
1416
1417 enum AVMediaType codec_type; /* see AVMEDIA_TYPE_xxx */
1418 const struct AVCodec *codec;
1419 #if FF_API_CODEC_NAME
1420 /**
1421 * @deprecated this field is not used for anything in libavcodec
1422 */
1423 attribute_deprecated
1424 char codec_name[32];
1425 #endif
1426 enum AVCodecID codec_id; /* see AV_CODEC_ID_xxx */
1427
1428 /**
1429 * fourcc (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A').
1430 * This is used to work around some encoder bugs.
1431 * A demuxer should set this to what is stored in the field used to identify the codec.
1432 * If there are multiple such fields in a container then the demuxer should choose the one
1433 * which maximizes the information about the used codec.
1434 * If the codec tag field in a container is larger than 32 bits then the demuxer should
1435 * remap the longer ID to 32 bits with a table or other structure. Alternatively a new
1436 * extra_codec_tag + size could be added but for this a clear advantage must be demonstrated
1437 * first.
1438 * - encoding: Set by user, if not then the default based on codec_id will be used.
1439 * - decoding: Set by user, will be converted to uppercase by libavcodec during init.
1440 */
1441 unsigned int codec_tag;
1442
1443 #if FF_API_STREAM_CODEC_TAG
1444 /**
1445 * @deprecated this field is unused
1446 */
1447 attribute_deprecated
1448 unsigned int stream_codec_tag;
1449 #endif
1450
1451 void *priv_data;
1452
1453 /**
1454 * Private context used for internal data.
1455 *
1456 * Unlike priv_data, this is not codec-specific. It is used in general
1457 * libavcodec functions.
1458 */
1459 struct AVCodecInternal *internal;
1460
1461 /**
1462 * Private data of the user, can be used to carry app specific stuff.
1463 * - encoding: Set by user.
1464 * - decoding: Set by user.
1465 */
1466 void *opaque;
1467
1468 /**
1469 * the average bitrate
1470 * - encoding: Set by user; unused for constant quantizer encoding.
1471 * - decoding: Set by libavcodec. 0 or some bitrate if this info is available in the stream.
1472 */
1473 int bit_rate;
1474
1475 /**
1476 * number of bits the bitstream is allowed to diverge from the reference.
1477 * the reference can be CBR (for CBR pass1) or VBR (for pass2)
1478 * - encoding: Set by user; unused for constant quantizer encoding.
1479 * - decoding: unused
1480 */
1481 int bit_rate_tolerance;
1482
1483 /**
1484 * Global quality for codecs which cannot change it per frame.
1485 * This should be proportional to MPEG-1/2/4 qscale.
1486 * - encoding: Set by user.
1487 * - decoding: unused
1488 */
1489 int global_quality;
1490
1491 /**
1492 * - encoding: Set by user.
1493 * - decoding: unused
1494 */
1495 int compression_level;
1496 #define FF_COMPRESSION_DEFAULT -1
1497
1498 /**
1499 * AV_CODEC_FLAG_*.
1500 * - encoding: Set by user.
1501 * - decoding: Set by user.
1502 */
1503 int flags;
1504
1505 /**
1506 * AV_CODEC_FLAG2_*
1507 * - encoding: Set by user.
1508 * - decoding: Set by user.
1509 */
1510 int flags2;
1511
1512 /**
1513 * some codecs need / can use extradata like Huffman tables.
1514 * MJPEG: Huffman tables
1515 * rv10: additional flags
1516 * MPEG-4: global headers (they can be in the bitstream or here)
1517 * The allocated memory should be AV_INPUT_BUFFER_PADDING_SIZE bytes larger
1518 * than extradata_size to avoid problems if it is read with the bitstream reader.
1519 * The bytewise contents of extradata must not depend on the architecture or CPU endianness.
1520 * - encoding: Set/allocated/freed by libavcodec.
1521 * - decoding: Set/allocated/freed by user.
1522 */
1523 uint8_t *extradata;
1524 int extradata_size;
1525
1526 /**
1527 * This is the fundamental unit of time (in seconds) in terms
1528 * of which frame timestamps are represented. For fixed-fps content,
1529 * timebase should be 1/framerate and timestamp increments should be
1530 * identically 1.
1531 * - encoding: MUST be set by user.
1532 * - decoding: the use of this field for decoding is deprecated.
1533 * Use framerate instead.
1534 */
1535 AVRational time_base;
1536
1537 /**
1538 * For some codecs, the time base is closer to the field rate than the frame rate.
1539 * Most notably, H.264 and MPEG-2 specify time_base as half of frame duration
1540 * if no telecine is used ...
1541 *
1542 * Set to time_base ticks per frame. Default 1, e.g., H.264/MPEG-2 set it to 2.
1543 */
1544 int ticks_per_frame;
1545
1546 /**
1547 * Codec delay.
1548 *
1549 * Video:
1550 * Number of frames the decoded output will be delayed relative to the
1551 * encoded input.
1552 *
1553 * Audio:
1554 * For encoding, this field is unused (see initial_padding).
1555 *
1556 * For decoding, this is the number of samples the decoder needs to
1557 * output before the decoder's output is valid. When seeking, you should
1558 * start decoding this many samples prior to your desired seek point.
1559 *
1560 * - encoding: Set by libavcodec.
1561 * - decoding: Set by libavcodec.
1562 */
1563 int delay;
1564
1565
1566 /* video only */
1567 /**
1568 * picture width / height.
1569 *
1570 * @note Those fields may not match the values of the last
1571 * AVFrame output by avcodec_decode_video2 due frame
1572 * reordering.
1573 *
1574 * - encoding: MUST be set by user.
1575 * - decoding: May be set by the user before opening the decoder if known e.g.
1576 * from the container. Some decoders will require the dimensions
1577 * to be set by the caller. During decoding, the decoder may
1578 * overwrite those values as required while parsing the data.
1579 */
1580 int width, height;
1581
1582 /**
1583 * Bitstream width / height, may be different from width/height e.g. when
1584 * the decoded frame is cropped before being output.
1585 *
1586 * @note Those field may not match the value of the last
1587 * AVFrame output by avcodec_receive_frame() due frame
1588 * reordering.
1589 *
1590 * - encoding: unused
1591 * - decoding: May be set by the user before opening the decoder if known
1592 * e.g. from the container. During decoding, the decoder may
1593 * overwrite those values as required while parsing the data.
1594 */
1595 int coded_width, coded_height;
1596
1597 #if FF_API_ASPECT_EXTENDED
1598 #define FF_ASPECT_EXTENDED 15
1599 #endif
1600
1601 /**
1602 * the number of pictures in a group of pictures, or 0 for intra_only
1603 * - encoding: Set by user.
1604 * - decoding: unused
1605 */
1606 int gop_size;
1607
1608 /**
1609 * Pixel format, see AV_PIX_FMT_xxx.
1610 * May be set by the demuxer if known from headers.
1611 * May be overridden by the decoder if it knows better.
1612 *
1613 * @note This field may not match the value of the last
1614 * AVFrame output by avcodec_receive_frame() due frame
1615 * reordering.
1616 *
1617 * - encoding: Set by user.
1618 * - decoding: Set by user if known, overridden by libavcodec while
1619 * parsing the data.
1620 */
1621 enum AVPixelFormat pix_fmt;
1622
1623 #if FF_API_MOTION_EST
1624 /**
1625 * This option does nothing
1626 * @deprecated use codec private options instead
1627 */
1628 attribute_deprecated int me_method;
1629 #endif
1630
1631 /**
1632 * If non NULL, 'draw_horiz_band' is called by the libavcodec
1633 * decoder to draw a horizontal band. It improves cache usage. Not
1634 * all codecs can do that. You must check the codec capabilities
1635 * beforehand.
1636 * When multithreading is used, it may be called from multiple threads
1637 * at the same time; threads might draw different parts of the same AVFrame,
1638 * or multiple AVFrames, and there is no guarantee that slices will be drawn
1639 * in order.
1640 * The function is also used by hardware acceleration APIs.
1641 * It is called at least once during frame decoding to pass
1642 * the data needed for hardware render.
1643 * In that mode instead of pixel data, AVFrame points to
1644 * a structure specific to the acceleration API. The application
1645 * reads the structure and can change some fields to indicate progress
1646 * or mark state.
1647 * - encoding: unused
1648 * - decoding: Set by user.
1649 * @param height the height of the slice
1650 * @param y the y position of the slice
1651 * @param type 1->top field, 2->bottom field, 3->frame
1652 * @param offset offset into the AVFrame.data from which the slice should be read
1653 */
1654 void (*draw_horiz_band)(struct AVCodecContext *s,
1655 const AVFrame *src, int offset[AV_NUM_DATA_POINTERS],
1656 int y, int type, int height);
1657
1658 /**
1659 * callback to negotiate the pixelFormat
1660 * @param fmt is the list of formats which are supported by the codec,
1661 * it is terminated by -1 as 0 is a valid format, the formats are ordered by quality.
1662 * The first is always the native one.
1663 * @note The callback may be called again immediately if initialization for
1664 * the selected (hardware-accelerated) pixel format failed.
1665 * @warning Behavior is undefined if the callback returns a value not
1666 * in the fmt list of formats.
1667 * @return the chosen format
1668 * - encoding: unused
1669 * - decoding: Set by user, if not set the native format will be chosen.
1670 */
1671 enum AVPixelFormat (*get_format)(struct AVCodecContext *s, const enum AVPixelFormat * fmt);
1672
1673 /**
1674 * maximum number of B-frames between non-B-frames
1675 * Note: The output will be delayed by max_b_frames+1 relative to the input.
1676 * - encoding: Set by user.
1677 * - decoding: unused
1678 */
1679 int max_b_frames;
1680
1681 /**
1682 * qscale factor between IP and B-frames
1683 * If > 0 then the last P-frame quantizer will be used (q= lastp_q*factor+offset).
1684 * If < 0 then normal ratecontrol will be done (q= -normal_q*factor+offset).
1685 * - encoding: Set by user.
1686 * - decoding: unused
1687 */
1688 float b_quant_factor;
1689
1690 #if FF_API_RC_STRATEGY
1691 /** @deprecated use codec private option instead */
1692 attribute_deprecated int rc_strategy;
1693 #define FF_RC_STRATEGY_XVID 1
1694 #endif
1695
1696 #if FF_API_PRIVATE_OPT
1697 /** @deprecated use encoder private options instead */
1698 attribute_deprecated
1699 int b_frame_strategy;
1700 #endif
1701
1702 /**
1703 * qscale offset between IP and B-frames
1704 * - encoding: Set by user.
1705 * - decoding: unused
1706 */
1707 float b_quant_offset;
1708
1709 /**
1710 * Size of the frame reordering buffer in the decoder.
1711 * For MPEG-2 it is 1 IPB or 0 low delay IP.
1712 * - encoding: Set by libavcodec.
1713 * - decoding: Set by libavcodec.
1714 */
1715 int has_b_frames;
1716
1717 #if FF_API_PRIVATE_OPT
1718 /** @deprecated use encoder private options instead */
1719 attribute_deprecated
1720 int mpeg_quant;
1721 #endif
1722
1723 /**
1724 * qscale factor between P- and I-frames
1725 * If > 0 then the last P-frame quantizer will be used (q = lastp_q * factor + offset).
1726 * If < 0 then normal ratecontrol will be done (q= -normal_q*factor+offset).
1727 * - encoding: Set by user.
1728 * - decoding: unused
1729 */
1730 float i_quant_factor;
1731
1732 /**
1733 * qscale offset between P and I-frames
1734 * - encoding: Set by user.
1735 * - decoding: unused
1736 */
1737 float i_quant_offset;
1738
1739 /**
1740 * luminance masking (0-> disabled)
1741 * - encoding: Set by user.
1742 * - decoding: unused
1743 */
1744 float lumi_masking;
1745
1746 /**
1747 * temporary complexity masking (0-> disabled)
1748 * - encoding: Set by user.
1749 * - decoding: unused
1750 */
1751 float temporal_cplx_masking;
1752
1753 /**
1754 * spatial complexity masking (0-> disabled)
1755 * - encoding: Set by user.
1756 * - decoding: unused
1757 */
1758 float spatial_cplx_masking;
1759
1760 /**
1761 * p block masking (0-> disabled)
1762 * - encoding: Set by user.
1763 * - decoding: unused
1764 */
1765 float p_masking;
1766
1767 /**
1768 * darkness masking (0-> disabled)
1769 * - encoding: Set by user.
1770 * - decoding: unused
1771 */
1772 float dark_masking;
1773
1774 /**
1775 * slice count
1776 * - encoding: Set by libavcodec.
1777 * - decoding: Set by user (or 0).
1778 */
1779 int slice_count;
1780
1781 #if FF_API_PRIVATE_OPT
1782 /** @deprecated use encoder private options instead */
1783 attribute_deprecated
1784 int prediction_method;
1785 #define FF_PRED_LEFT 0
1786 #define FF_PRED_PLANE 1
1787 #define FF_PRED_MEDIAN 2
1788 #endif
1789
1790 /**
1791 * slice offsets in the frame in bytes
1792 * - encoding: Set/allocated by libavcodec.
1793 * - decoding: Set/allocated by user (or NULL).
1794 */
1795 int *slice_offset;
1796
1797 /**
1798 * sample aspect ratio (0 if unknown)
1799 * That is the width of a pixel divided by the height of the pixel.
1800 * Numerator and denominator must be relatively prime and smaller than 256 for some video standards.
1801 * - encoding: Set by user.
1802 * - decoding: Set by libavcodec.
1803 */
1804 AVRational sample_aspect_ratio;
1805
1806 /**
1807 * motion estimation comparison function
1808 * - encoding: Set by user.
1809 * - decoding: unused
1810 */
1811 int me_cmp;
1812 /**
1813 * subpixel motion estimation comparison function
1814 * - encoding: Set by user.
1815 * - decoding: unused
1816 */
1817 int me_sub_cmp;
1818 /**
1819 * macroblock comparison function (not supported yet)
1820 * - encoding: Set by user.
1821 * - decoding: unused
1822 */
1823 int mb_cmp;
1824 /**
1825 * interlaced DCT comparison function
1826 * - encoding: Set by user.
1827 * - decoding: unused
1828 */
1829 int ildct_cmp;
1830 #define FF_CMP_SAD 0
1831 #define FF_CMP_SSE 1
1832 #define FF_CMP_SATD 2
1833 #define FF_CMP_DCT 3
1834 #define FF_CMP_PSNR 4
1835 #define FF_CMP_BIT 5
1836 #define FF_CMP_RD 6
1837 #define FF_CMP_ZERO 7
1838 #define FF_CMP_VSAD 8
1839 #define FF_CMP_VSSE 9
1840 #define FF_CMP_NSSE 10
1841 #define FF_CMP_DCTMAX 13
1842 #define FF_CMP_DCT264 14
1843 #define FF_CMP_CHROMA 256
1844
1845 /**
1846 * ME diamond size & shape
1847 * - encoding: Set by user.
1848 * - decoding: unused
1849 */
1850 int dia_size;
1851
1852 /**
1853 * amount of previous MV predictors (2a+1 x 2a+1 square)
1854 * - encoding: Set by user.
1855 * - decoding: unused
1856 */
1857 int last_predictor_count;
1858
1859 #if FF_API_PRIVATE_OPT
1860 /** @deprecated use encoder private options instead */
1861 attribute_deprecated
1862 int pre_me;
1863 #endif
1864
1865 /**
1866 * motion estimation prepass comparison function
1867 * - encoding: Set by user.
1868 * - decoding: unused
1869 */
1870 int me_pre_cmp;
1871
1872 /**
1873 * ME prepass diamond size & shape
1874 * - encoding: Set by user.
1875 * - decoding: unused
1876 */
1877 int pre_dia_size;
1878
1879 /**
1880 * subpel ME quality
1881 * - encoding: Set by user.
1882 * - decoding: unused
1883 */
1884 int me_subpel_quality;
1885
1886 #if FF_API_AFD
1887 /**
1888 * DTG active format information (additional aspect ratio
1889 * information only used in DVB MPEG-2 transport streams)
1890 * 0 if not set.
1891 *
1892 * - encoding: unused
1893 * - decoding: Set by decoder.
1894 * @deprecated Deprecated in favor of AVSideData
1895 */
1896 attribute_deprecated int dtg_active_format;
1897 #define FF_DTG_AFD_SAME 8
1898 #define FF_DTG_AFD_4_3 9
1899 #define FF_DTG_AFD_16_9 10
1900 #define FF_DTG_AFD_14_9 11
1901 #define FF_DTG_AFD_4_3_SP_14_9 13
1902 #define FF_DTG_AFD_16_9_SP_14_9 14
1903 #define FF_DTG_AFD_SP_4_3 15
1904 #endif /* FF_API_AFD */
1905
1906 /**
1907 * maximum motion estimation search range in subpel units
1908 * If 0 then no limit.
1909 *
1910 * - encoding: Set by user.
1911 * - decoding: unused
1912 */
1913 int me_range;
1914
1915 #if FF_API_QUANT_BIAS
1916 /**
1917 * @deprecated use encoder private option instead
1918 */
1919 attribute_deprecated int intra_quant_bias;
1920 #define FF_DEFAULT_QUANT_BIAS 999999
1921
1922 /**
1923 * @deprecated use encoder private option instead
1924 */
1925 attribute_deprecated int inter_quant_bias;
1926 #endif
1927
1928 /**
1929 * slice flags
1930 * - encoding: unused
1931 * - decoding: Set by user.
1932 */
1933 int slice_flags;
1934 #define SLICE_FLAG_CODED_ORDER 0x0001 ///< draw_horiz_band() is called in coded order instead of display
1935 #define SLICE_FLAG_ALLOW_FIELD 0x0002 ///< allow draw_horiz_band() with field slices (MPEG-2 field pics)
1936 #define SLICE_FLAG_ALLOW_PLANE 0x0004 ///< allow draw_horiz_band() with 1 component at a time (SVQ1)
1937
1938 #if FF_API_XVMC
1939 /**
1940 * XVideo Motion Acceleration
1941 * - encoding: forbidden
1942 * - decoding: set by decoder
1943 * @deprecated XvMC support is slated for removal.
1944 */
1945 attribute_deprecated int xvmc_acceleration;
1946 #endif /* FF_API_XVMC */
1947
1948 /**
1949 * macroblock decision mode
1950 * - encoding: Set by user.
1951 * - decoding: unused
1952 */
1953 int mb_decision;
1954 #define FF_MB_DECISION_SIMPLE 0 ///< uses mb_cmp
1955 #define FF_MB_DECISION_BITS 1 ///< chooses the one which needs the fewest bits
1956 #define FF_MB_DECISION_RD 2 ///< rate distortion
1957
1958 /**
1959 * custom intra quantization matrix
1960 * - encoding: Set by user, can be NULL.
1961 * - decoding: Set by libavcodec.
1962 */
1963 uint16_t *intra_matrix;
1964
1965 /**
1966 * custom inter quantization matrix
1967 * - encoding: Set by user, can be NULL.
1968 * - decoding: Set by libavcodec.
1969 */
1970 uint16_t *inter_matrix;
1971
1972 #if FF_API_PRIVATE_OPT
1973 /** @deprecated use encoder private options instead */
1974 attribute_deprecated
1975 int scenechange_threshold;
1976
1977 /** @deprecated use encoder private options instead */
1978 attribute_deprecated
1979 int noise_reduction;
1980 #endif
1981
1982 #if FF_API_MPV_OPT
1983 /**
1984 * @deprecated this field is unused
1985 */
1986 attribute_deprecated
1987 int me_threshold;
1988
1989 /**
1990 * @deprecated this field is unused
1991 */
1992 attribute_deprecated
1993 int mb_threshold;
1994 #endif
1995
1996 /**
1997 * precision of the intra DC coefficient - 8
1998 * - encoding: Set by user.
1999 * - decoding: unused
2000 */
2001 int intra_dc_precision;
2002
2003 /**
2004 * Number of macroblock rows at the top which are skipped.
2005 * - encoding: unused
2006 * - decoding: Set by user.
2007 */
2008 int skip_top;
2009
2010 /**
2011 * Number of macroblock rows at the bottom which are skipped.
2012 * - encoding: unused
2013 * - decoding: Set by user.
2014 */
2015 int skip_bottom;
2016
2017 #if FF_API_MPV_OPT
2018 /**
2019 * @deprecated use encoder private options instead
2020 */
2021 attribute_deprecated
2022 float border_masking;
2023 #endif
2024
2025 /**
2026 * minimum MB Lagrange multiplier
2027 * - encoding: Set by user.
2028 * - decoding: unused
2029 */
2030 int mb_lmin;
2031
2032 /**
2033 * maximum MB Lagrange multiplier
2034 * - encoding: Set by user.
2035 * - decoding: unused
2036 */
2037 int mb_lmax;
2038
2039 #if FF_API_PRIVATE_OPT
2040 /**
2041 * @deprecated use encoder private options instead
2042 */
2043 attribute_deprecated
2044 int me_penalty_compensation;
2045 #endif
2046
2047 /**
2048 * - encoding: Set by user.
2049 * - decoding: unused
2050 */
2051 int bidir_refine;
2052
2053 #if FF_API_PRIVATE_OPT
2054 /** @deprecated use encoder private options instead */
2055 attribute_deprecated
2056 int brd_scale;
2057 #endif
2058
2059 /**
2060 * minimum GOP size
2061 * - encoding: Set by user.
2062 * - decoding: unused
2063 */
2064 int keyint_min;
2065
2066 /**
2067 * number of reference frames
2068 * - encoding: Set by user.
2069 * - decoding: Set by lavc.
2070 */
2071 int refs;
2072
2073 #if FF_API_PRIVATE_OPT
2074 /** @deprecated use encoder private options instead */
2075 attribute_deprecated
2076 int chromaoffset;
2077 #endif
2078
2079 #if FF_API_UNUSED_MEMBERS
2080 /**
2081 * Multiplied by qscale for each frame and added to scene_change_score.
2082 * - encoding: Set by user.
2083 * - decoding: unused
2084 */
2085 attribute_deprecated int scenechange_factor;
2086 #endif
2087
2088 /**
2089 * Note: Value depends upon the compare function used for fullpel ME.
2090 * - encoding: Set by user.
2091 * - decoding: unused
2092 */
2093 int mv0_threshold;
2094
2095 #if FF_API_PRIVATE_OPT
2096 /** @deprecated use encoder private options instead */
2097 attribute_deprecated
2098 int b_sensitivity;
2099 #endif
2100
2101 /**
2102 * Chromaticity coordinates of the source primaries.
2103 * - encoding: Set by user
2104 * - decoding: Set by libavcodec
2105 */
2106 enum AVColorPrimaries color_primaries;
2107
2108 /**
2109 * Color Transfer Characteristic.
2110 * - encoding: Set by user
2111 * - decoding: Set by libavcodec
2112 */
2113 enum AVColorTransferCharacteristic color_trc;
2114
2115 /**
2116 * YUV colorspace type.
2117 * - encoding: Set by user
2118 * - decoding: Set by libavcodec
2119 */
2120 enum AVColorSpace colorspace;
2121
2122 /**
2123 * MPEG vs JPEG YUV range.
2124 * - encoding: Set by user
2125 * - decoding: Set by libavcodec
2126 */
2127 enum AVColorRange color_range;
2128
2129 /**
2130 * This defines the location of chroma samples.
2131 * - encoding: Set by user
2132 * - decoding: Set by libavcodec
2133 */
2134 enum AVChromaLocation chroma_sample_location;
2135
2136 /**
2137 * Number of slices.
2138 * Indicates number of picture subdivisions. Used for parallelized
2139 * decoding.
2140 * - encoding: Set by user
2141 * - decoding: unused
2142 */
2143 int slices;
2144
2145 /** Field order
2146 * - encoding: set by libavcodec
2147 * - decoding: Set by libavcodec
2148 */
2149 enum AVFieldOrder field_order;
2150
2151 /* audio only */
2152 int sample_rate; ///< samples per second
2153 int channels; ///< number of audio channels
2154
2155 /**
2156 * audio sample format
2157 * - encoding: Set by user.
2158 * - decoding: Set by libavcodec.
2159 */
2160 enum AVSampleFormat sample_fmt; ///< sample format
2161
2162 /* The following data should not be initialized. */
2163 /**
2164 * Number of samples per channel in an audio frame.
2165 *
2166 * - encoding: set by libavcodec in avcodec_open2(). Each submitted frame
2167 * except the last must contain exactly frame_size samples per channel.
2168 * May be 0 when the codec has AV_CODEC_CAP_VARIABLE_FRAME_SIZE set, then the
2169 * frame size is not restricted.
2170 * - decoding: may be set by some decoders to indicate constant frame size
2171 */
2172 int frame_size;
2173
2174 /**
2175 * Frame counter, set by libavcodec.
2176 *
2177 * - decoding: total number of frames returned from the decoder so far.
2178 * - encoding: total number of frames passed to the encoder so far.
2179 *
2180 * @note the counter is not incremented if encoding/decoding resulted in
2181 * an error.
2182 */
2183 int frame_number;
2184
2185 /**
2186 * number of bytes per packet if constant and known or 0
2187 * Used by some WAV based audio codecs.
2188 */
2189 int block_align;
2190
2191 /**
2192 * Audio cutoff bandwidth (0 means "automatic")
2193 * - encoding: Set by user.
2194 * - decoding: unused
2195 */
2196 int cutoff;
2197
2198 /**
2199 * Audio channel layout.
2200 * - encoding: set by user.
2201 * - decoding: set by libavcodec.
2202 */
2203 uint64_t channel_layout;
2204
2205 /**
2206 * Request decoder to use this channel layout if it can (0 for default)
2207 * - encoding: unused
2208 * - decoding: Set by user.
2209 */
2210 uint64_t request_channel_layout;
2211
2212 /**
2213 * Type of service that the audio stream conveys.
2214 * - encoding: Set by user.
2215 * - decoding: Set by libavcodec.
2216 */
2217 enum AVAudioServiceType audio_service_type;
2218
2219 /**
2220 * Used to request a sample format from the decoder.
2221 * - encoding: unused.
2222 * - decoding: Set by user.
2223 */
2224 enum AVSampleFormat request_sample_fmt;
2225
2226 /**
2227 * This callback is called at the beginning of each frame to get data
2228 * buffer(s) for it. There may be one contiguous buffer for all the data or
2229 * there may be a buffer per each data plane or anything in between. What
2230 * this means is, you may set however many entries in buf[] you feel necessary.
2231 * Each buffer must be reference-counted using the AVBuffer API (see description
2232 * of buf[] below).
2233 *
2234 * The following fields will be set in the frame before this callback is
2235 * called:
2236 * - format
2237 * - width, height (video only)
2238 * - sample_rate, channel_layout, nb_samples (audio only)
2239 * Their values may differ from the corresponding values in
2240 * AVCodecContext. This callback must use the frame values, not the codec
2241 * context values, to calculate the required buffer size.
2242 *
2243 * This callback must fill the following fields in the frame:
2244 * - data[]
2245 * - linesize[]
2246 * - extended_data:
2247 * * if the data is planar audio with more than 8 channels, then this
2248 * callback must allocate and fill extended_data to contain all pointers
2249 * to all data planes. data[] must hold as many pointers as it can.
2250 * extended_data must be allocated with av_malloc() and will be freed in
2251 * av_frame_unref().
2252 * * otherwise extended_data must point to data
2253 * - buf[] must contain one or more pointers to AVBufferRef structures. Each of
2254 * the frame's data and extended_data pointers must be contained in these. That
2255 * is, one AVBufferRef for each allocated chunk of memory, not necessarily one
2256 * AVBufferRef per data[] entry. See: av_buffer_create(), av_buffer_alloc(),
2257 * and av_buffer_ref().
2258 * - extended_buf and nb_extended_buf must be allocated with av_malloc() by
2259 * this callback and filled with the extra buffers if there are more
2260 * buffers than buf[] can hold. extended_buf will be freed in
2261 * av_frame_unref().
2262 *
2263 * If AV_CODEC_CAP_DR1 is not set then get_buffer2() must call
2264 * avcodec_default_get_buffer2() instead of providing buffers allocated by
2265 * some other means.
2266 *
2267 * Each data plane must be aligned to the maximum required by the target
2268 * CPU.
2269 *
2270 * @see avcodec_default_get_buffer2()
2271 *
2272 * Video:
2273 *
2274 * If AV_GET_BUFFER_FLAG_REF is set in flags then the frame may be reused
2275 * (read and/or written to if it is writable) later by libavcodec.
2276 *
2277 * avcodec_align_dimensions2() should be used to find the required width and
2278 * height, as they normally need to be rounded up to the next multiple of 16.
2279 *
2280 * If frame multithreading is used and thread_safe_callbacks is set,
2281 * this callback may be called from a different thread, but not from more
2282 * than one at once. Does not need to be reentrant.
2283 *
2284 * @see avcodec_align_dimensions2()
2285 *
2286 * Audio:
2287 *
2288 * Decoders request a buffer of a particular size by setting
2289 * AVFrame.nb_samples prior to calling get_buffer2(). The decoder may,
2290 * however, utilize only part of the buffer by setting AVFrame.nb_samples
2291 * to a smaller value in the output frame.
2292 *
2293 * As a convenience, av_samples_get_buffer_size() and
2294 * av_samples_fill_arrays() in libavutil may be used by custom get_buffer2()
2295 * functions to find the required data size and to fill data pointers and
2296 * linesize. In AVFrame.linesize, only linesize[0] may be set for audio
2297 * since all planes must be the same size.
2298 *
2299 * @see av_samples_get_buffer_size(), av_samples_fill_arrays()
2300 *
2301 * - encoding: unused
2302 * - decoding: Set by libavcodec, user can override.
2303 */
2304 int (*get_buffer2)(struct AVCodecContext *s, AVFrame *frame, int flags);
2305
2306 /**
2307 * If non-zero, the decoded audio and video frames returned from
2308 * avcodec_decode_video2() and avcodec_decode_audio4() are reference-counted
2309 * and are valid indefinitely. The caller must free them with
2310 * av_frame_unref() when they are not needed anymore.
2311 * Otherwise, the decoded frames must not be freed by the caller and are
2312 * only valid until the next decode call.
2313 *
2314 * This is always automatically enabled if avcodec_receive_frame() is used.
2315 *
2316 * - encoding: unused
2317 * - decoding: set by the caller before avcodec_open2().
2318 */
2319 int refcounted_frames;
2320
2321 /* - encoding parameters */
2322 float qcompress; ///< amount of qscale change between easy & hard scenes (0.0-1.0)
2323 float qblur; ///< amount of qscale smoothing over time (0.0-1.0)
2324
2325 /**
2326 * minimum quantizer
2327 * - encoding: Set by user.
2328 * - decoding: unused
2329 */
2330 int qmin;
2331
2332 /**
2333 * maximum quantizer
2334 * - encoding: Set by user.
2335 * - decoding: unused
2336 */
2337 int qmax;
2338
2339 /**
2340 * maximum quantizer difference between frames
2341 * - encoding: Set by user.
2342 * - decoding: unused
2343 */
2344 int max_qdiff;
2345
2346 #if FF_API_MPV_OPT
2347 /**
2348 * @deprecated use encoder private options instead
2349 */
2350 attribute_deprecated
2351 float rc_qsquish;
2352
2353 attribute_deprecated
2354 float rc_qmod_amp;
2355 attribute_deprecated
2356 int rc_qmod_freq;
2357 #endif
2358
2359 /**
2360 * decoder bitstream buffer size
2361 * - encoding: Set by user.
2362 * - decoding: unused
2363 */
2364 int rc_buffer_size;
2365
2366 /**
2367 * ratecontrol override, see RcOverride
2368 * - encoding: Allocated/set/freed by user.
2369 * - decoding: unused
2370 */
2371 int rc_override_count;
2372 RcOverride *rc_override;
2373
2374 #if FF_API_MPV_OPT
2375 /**
2376 * @deprecated use encoder private options instead
2377 */
2378 attribute_deprecated
2379 const char *rc_eq;
2380 #endif
2381
2382 /**
2383 * maximum bitrate
2384 * - encoding: Set by user.
2385 * - decoding: unused
2386 */
2387 int rc_max_rate;
2388
2389 /**
2390 * minimum bitrate
2391 * - encoding: Set by user.
2392 * - decoding: unused
2393 */
2394 int rc_min_rate;
2395
2396 #if FF_API_MPV_OPT
2397 /**
2398 * @deprecated use encoder private options instead
2399 */
2400 attribute_deprecated
2401 float rc_buffer_aggressivity;
2402
2403 attribute_deprecated
2404 float rc_initial_cplx;
2405 #endif
2406
2407 /**
2408 * Ratecontrol attempt to use, at maximum, <value> of what can be used without an underflow.
2409 * - encoding: Set by user.
2410 * - decoding: unused.
2411 */
2412 float rc_max_available_vbv_use;
2413
2414 /**
2415 * Ratecontrol attempt to use, at least, <value> times the amount needed to prevent a vbv overflow.
2416 * - encoding: Set by user.
2417 * - decoding: unused.
2418 */
2419 float rc_min_vbv_overflow_use;
2420
2421 /**
2422 * Number of bits which should be loaded into the rc buffer before decoding starts.
2423 * - encoding: Set by user.
2424 * - decoding: unused
2425 */
2426 int rc_initial_buffer_occupancy;
2427
2428 #if FF_API_CODER_TYPE
2429 #define FF_CODER_TYPE_VLC 0
2430 #define FF_CODER_TYPE_AC 1
2431 #define FF_CODER_TYPE_RAW 2
2432 #define FF_CODER_TYPE_RLE 3
2433 #if FF_API_UNUSED_MEMBERS
2434 #define FF_CODER_TYPE_DEFLATE 4
2435 #endif /* FF_API_UNUSED_MEMBERS */
2436 /**
2437 * @deprecated use encoder private options instead
2438 */
2439 attribute_deprecated
2440 int coder_type;
2441 #endif /* FF_API_CODER_TYPE */
2442
2443 #if FF_API_PRIVATE_OPT
2444 /** @deprecated use encoder private options instead */
2445 attribute_deprecated
2446 int context_model;
2447 #endif
2448
2449 #if FF_API_MPV_OPT
2450 /**
2451 * @deprecated use encoder private options instead
2452 */
2453 attribute_deprecated
2454 int lmin;
2455
2456 /**
2457 * @deprecated use encoder private options instead
2458 */
2459 attribute_deprecated
2460 int lmax;
2461 #endif
2462
2463 #if FF_API_PRIVATE_OPT
2464 /** @deprecated use encoder private options instead */
2465 attribute_deprecated
2466 int frame_skip_threshold;
2467
2468 /** @deprecated use encoder private options instead */
2469 attribute_deprecated
2470 int frame_skip_factor;
2471
2472 /** @deprecated use encoder private options instead */
2473 attribute_deprecated
2474 int frame_skip_exp;
2475
2476 /** @deprecated use encoder private options instead */
2477 attribute_deprecated
2478 int frame_skip_cmp;
2479 #endif /* FF_API_PRIVATE_OPT */
2480
2481 /**
2482 * trellis RD quantization
2483 * - encoding: Set by user.
2484 * - decoding: unused
2485 */
2486 int trellis;
2487
2488 #if FF_API_PRIVATE_OPT
2489 /** @deprecated use encoder private options instead */
2490 attribute_deprecated
2491 int min_prediction_order;
2492
2493 /** @deprecated use encoder private options instead */
2494 attribute_deprecated
2495 int max_prediction_order;
2496
2497 /** @deprecated use encoder private options instead */
2498 attribute_deprecated
2499 int64_t timecode_frame_start;
2500 #endif
2501
2502 #if FF_API_RTP_CALLBACK
2503 /**
2504 * @deprecated unused
2505 */
2506 /* The RTP callback: This function is called */
2507 /* every time the encoder has a packet to send. */
2508 /* It depends on the encoder if the data starts */
2509 /* with a Start Code (it should). H.263 does. */
2510 /* mb_nb contains the number of macroblocks */
2511 /* encoded in the RTP payload. */
2512 attribute_deprecated
2513 void (*rtp_callback)(struct AVCodecContext *avctx, void *data, int size, int mb_nb);
2514 #endif
2515
2516 #if FF_API_PRIVATE_OPT
2517 /** @deprecated use encoder private options instead */
2518 attribute_deprecated
2519 int rtp_payload_size; /* The size of the RTP payload: the coder will */
2520 /* do its best to deliver a chunk with size */
2521 /* below rtp_payload_size, the chunk will start */
2522 /* with a start code on some codecs like H.263. */
2523 /* This doesn't take account of any particular */
2524 /* headers inside the transmitted RTP payload. */
2525 #endif
2526
2527 #if FF_API_STAT_BITS
2528 /* statistics, used for 2-pass encoding */
2529 attribute_deprecated
2530 int mv_bits;
2531 attribute_deprecated
2532 int header_bits;
2533 attribute_deprecated
2534 int i_tex_bits;
2535 attribute_deprecated
2536 int p_tex_bits;
2537 attribute_deprecated
2538 int i_count;
2539 attribute_deprecated
2540 int p_count;
2541 attribute_deprecated
2542 int skip_count;
2543 attribute_deprecated
2544 int misc_bits;
2545
2546 /** @deprecated this field is unused */
2547 attribute_deprecated
2548 int frame_bits;
2549 #endif
2550
2551 /**
2552 * pass1 encoding statistics output buffer
2553 * - encoding: Set by libavcodec.
2554 * - decoding: unused
2555 */
2556 char *stats_out;
2557
2558 /**
2559 * pass2 encoding statistics input buffer
2560 * Concatenated stuff from stats_out of pass1 should be placed here.
2561 * - encoding: Allocated/set/freed by user.
2562 * - decoding: unused
2563 */
2564 char *stats_in;
2565
2566 /**
2567 * Work around bugs in encoders which sometimes cannot be detected automatically.
2568 * - encoding: Set by user
2569 * - decoding: Set by user
2570 */
2571 int workaround_bugs;
2572 #define FF_BUG_AUTODETECT 1 ///< autodetection
2573 #if FF_API_OLD_MSMPEG4
2574 #define FF_BUG_OLD_MSMPEG4 2
2575 #endif
2576 #define FF_BUG_XVID_ILACE 4
2577 #define FF_BUG_UMP4 8
2578 #define FF_BUG_NO_PADDING 16
2579 #define FF_BUG_AMV 32
2580 #if FF_API_AC_VLC
2581 #define FF_BUG_AC_VLC 0 ///< Will be removed, libavcodec can now handle these non-compliant files by default.
2582 #endif
2583 #define FF_BUG_QPEL_CHROMA 64
2584 #define FF_BUG_STD_QPEL 128
2585 #define FF_BUG_QPEL_CHROMA2 256
2586 #define FF_BUG_DIRECT_BLOCKSIZE 512
2587 #define FF_BUG_EDGE 1024
2588 #define FF_BUG_HPEL_CHROMA 2048
2589 #define FF_BUG_DC_CLIP 4096
2590 #define FF_BUG_MS 8192 ///< Work around various bugs in Microsoft's broken decoders.
2591 #define FF_BUG_TRUNCATED 16384
2592
2593 /**
2594 * strictly follow the standard (MPEG-4, ...).
2595 * - encoding: Set by user.
2596 * - decoding: Set by user.
2597 * Setting this to STRICT or higher means the encoder and decoder will
2598 * generally do stupid things, whereas setting it to unofficial or lower
2599 * will mean the encoder might produce output that is not supported by all
2600 * spec-compliant decoders. Decoders don't differentiate between normal,
2601 * unofficial and experimental (that is, they always try to decode things
2602 * when they can) unless they are explicitly asked to behave stupidly
2603 * (=strictly conform to the specs)
2604 */
2605 int strict_std_compliance;
2606 #define FF_COMPLIANCE_VERY_STRICT 2 ///< Strictly conform to an older more strict version of the spec or reference software.
2607 #define FF_COMPLIANCE_STRICT 1 ///< Strictly conform to all the things in the spec no matter what consequences.
2608 #define FF_COMPLIANCE_NORMAL 0
2609 #define FF_COMPLIANCE_UNOFFICIAL -1 ///< Allow unofficial extensions
2610 #define FF_COMPLIANCE_EXPERIMENTAL -2 ///< Allow nonstandardized experimental things.
2611
2612 /**
2613 * error concealment flags
2614 * - encoding: unused
2615 * - decoding: Set by user.
2616 */
2617 int error_concealment;
2618 #define FF_EC_GUESS_MVS 1
2619 #define FF_EC_DEBLOCK 2
2620
2621 /**
2622 * debug
2623 * - encoding: Set by user.
2624 * - decoding: Set by user.
2625 */
2626 int debug;
2627 #define FF_DEBUG_PICT_INFO 1
2628 #define FF_DEBUG_RC 2
2629 #define FF_DEBUG_BITSTREAM 4
2630 #define FF_DEBUG_MB_TYPE 8
2631 #define FF_DEBUG_QP 16
2632 #if FF_API_DEBUG_MV
2633 /**
2634 * @deprecated this option does nothing
2635 */
2636 #define FF_DEBUG_MV 32
2637 #endif
2638 #define FF_DEBUG_DCT_COEFF 0x00000040
2639 #define FF_DEBUG_SKIP 0x00000080
2640 #define FF_DEBUG_STARTCODE 0x00000100
2641 #if FF_API_UNUSED_MEMBERS
2642 #define FF_DEBUG_PTS 0x00000200
2643 #endif /* FF_API_UNUSED_MEMBERS */
2644 #define FF_DEBUG_ER 0x00000400
2645 #define FF_DEBUG_MMCO 0x00000800
2646 #define FF_DEBUG_BUGS 0x00001000
2647 #if FF_API_DEBUG_MV
2648 #define FF_DEBUG_VIS_QP 0x00002000
2649 #define FF_DEBUG_VIS_MB_TYPE 0x00004000
2650 #endif
2651 #define FF_DEBUG_BUFFERS 0x00008000
2652 #define FF_DEBUG_THREADS 0x00010000
2653
2654 #if FF_API_DEBUG_MV
2655 /**
2656 * @deprecated this option does not have any effect
2657 */
2658 attribute_deprecated
2659 int debug_mv;
2660 #define FF_DEBUG_VIS_MV_P_FOR 0x00000001 // visualize forward predicted MVs of P-frames
2661 #define FF_DEBUG_VIS_MV_B_FOR 0x00000002 // visualize forward predicted MVs of B-frames
2662 #define FF_DEBUG_VIS_MV_B_BACK 0x00000004 // visualize backward predicted MVs of B-frames
2663 #endif
2664
2665 /**
2666 * Error recognition; may misdetect some more or less valid parts as errors.
2667 * - encoding: unused
2668 * - decoding: Set by user.
2669 */
2670 int err_recognition;
2671
2672 /**
2673 * Verify checksums embedded in the bitstream (could be of either encoded or
2674 * decoded data, depending on the codec) and print an error message on mismatch.
2675 * If AV_EF_EXPLODE is also set, a mismatching checksum will result in the
2676 * decoder returning an error.
2677 */
2678 #define AV_EF_CRCCHECK (1<<0)
2679 #define AV_EF_BITSTREAM (1<<1)
2680 #define AV_EF_BUFFER (1<<2)
2681 #define AV_EF_EXPLODE (1<<3)
2682
2683 /**
2684 * opaque 64-bit number (generally a PTS) that will be reordered and
2685 * output in AVFrame.reordered_opaque
2686 * - encoding: unused
2687 * - decoding: Set by user.
2688 */
2689 int64_t reordered_opaque;
2690
2691 /**
2692 * Hardware accelerator in use
2693 * - encoding: unused.
2694 * - decoding: Set by libavcodec
2695 */
2696 struct AVHWAccel *hwaccel;
2697
2698 /**
2699 * Hardware accelerator context.
2700 * For some hardware accelerators, a global context needs to be
2701 * provided by the user. In that case, this holds display-dependent
2702 * data Libav cannot instantiate itself. Please refer to the
2703 * Libav HW accelerator documentation to know how to fill this
2704 * is. e.g. for VA API, this is a struct vaapi_context.
2705 * - encoding: unused
2706 * - decoding: Set by user
2707 */
2708 void *hwaccel_context;
2709
2710 /**
2711 * error
2712 * - encoding: Set by libavcodec if flags & AV_CODEC_FLAG_PSNR.
2713 * - decoding: unused
2714 */
2715 uint64_t error[AV_NUM_DATA_POINTERS];
2716
2717 /**
2718 * DCT algorithm, see FF_DCT_* below
2719 * - encoding: Set by user.
2720 * - decoding: unused
2721 */
2722 int dct_algo;
2723 #define FF_DCT_AUTO 0
2724 #define FF_DCT_FASTINT 1
2725 #define FF_DCT_INT 2
2726 #define FF_DCT_MMX 3
2727 #define FF_DCT_ALTIVEC 5
2728 #define FF_DCT_FAAN 6
2729
2730 /**
2731 * IDCT algorithm, see FF_IDCT_* below.
2732 * - encoding: Set by user.
2733 * - decoding: Set by user.
2734 */
2735 int idct_algo;
2736 #define FF_IDCT_AUTO 0
2737 #define FF_IDCT_INT 1
2738 #define FF_IDCT_SIMPLE 2
2739 #define FF_IDCT_SIMPLEMMX 3
2740 #define FF_IDCT_ARM 7
2741 #define FF_IDCT_ALTIVEC 8
2742 #if FF_API_ARCH_SH4
2743 #define FF_IDCT_SH4 9
2744 #endif
2745 #define FF_IDCT_SIMPLEARM 10
2746 #if FF_API_UNUSED_MEMBERS
2747 #define FF_IDCT_IPP 13
2748 #endif /* FF_API_UNUSED_MEMBERS */
2749 #define FF_IDCT_XVID 14
2750 #if FF_API_IDCT_XVIDMMX
2751 #define FF_IDCT_XVIDMMX 14
2752 #endif /* FF_API_IDCT_XVIDMMX */
2753 #define FF_IDCT_SIMPLEARMV5TE 16
2754 #define FF_IDCT_SIMPLEARMV6 17
2755 #if FF_API_ARCH_SPARC
2756 #define FF_IDCT_SIMPLEVIS 18
2757 #endif
2758 #define FF_IDCT_FAAN 20
2759 #define FF_IDCT_SIMPLENEON 22
2760 #if FF_API_ARCH_ALPHA
2761 #define FF_IDCT_SIMPLEALPHA 23
2762 #endif
2763
2764 /**
2765 * bits per sample/pixel from the demuxer (needed for huffyuv).
2766 * - encoding: Set by libavcodec.
2767 * - decoding: Set by user.
2768 */
2769 int bits_per_coded_sample;
2770
2771 /**
2772 * Bits per sample/pixel of internal libavcodec pixel/sample format.
2773 * - encoding: set by user.
2774 * - decoding: set by libavcodec.
2775 */
2776 int bits_per_raw_sample;
2777
2778 #if FF_API_LOWRES
2779 /**
2780 * low resolution decoding, 1-> 1/2 size, 2->1/4 size
2781 * - encoding: unused
2782 * - decoding: Set by user.
2783 *
2784 * @deprecated use decoder private options instead
2785 */
2786 attribute_deprecated int lowres;
2787 #endif
2788
2789 #if FF_API_CODED_FRAME
2790 /**
2791 * the picture in the bitstream
2792 * - encoding: Set by libavcodec.
2793 * - decoding: unused
2794 *
2795 * @deprecated use the quality factor packet side data instead
2796 */
2797 attribute_deprecated AVFrame *coded_frame;
2798 #endif
2799
2800 /**
2801 * thread count
2802 * is used to decide how many independent tasks should be passed to execute()
2803 * - encoding: Set by user.
2804 * - decoding: Set by user.
2805 */
2806 int thread_count;
2807
2808 /**
2809 * Which multithreading methods to use.
2810 * Use of FF_THREAD_FRAME will increase decoding delay by one frame per thread,
2811 * so clients which cannot provide future frames should not use it.
2812 *
2813 * - encoding: Set by user, otherwise the default is used.
2814 * - decoding: Set by user, otherwise the default is used.
2815 */
2816 int thread_type;
2817 #define FF_THREAD_FRAME 1 ///< Decode more than one frame at once
2818 #define FF_THREAD_SLICE 2 ///< Decode more than one part of a single frame at once
2819
2820 /**
2821 * Which multithreading methods are in use by the codec.
2822 * - encoding: Set by libavcodec.
2823 * - decoding: Set by libavcodec.
2824 */
2825 int active_thread_type;
2826
2827 /**
2828 * Set by the client if its custom get_buffer() callback can be called
2829 * synchronously from another thread, which allows faster multithreaded decoding.
2830 * draw_horiz_band() will be called from other threads regardless of this setting.
2831 * Ignored if the default get_buffer() is used.
2832 * - encoding: Set by user.
2833 * - decoding: Set by user.
2834 */
2835 int thread_safe_callbacks;
2836
2837 /**
2838 * The codec may call this to execute several independent things.
2839 * It will return only after finishing all tasks.
2840 * The user may replace this with some multithreaded implementation,
2841 * the default implementation will execute the parts serially.
2842 * @param count the number of things to execute
2843 * - encoding: Set by libavcodec, user can override.
2844 * - decoding: Set by libavcodec, user can override.
2845 */
2846 int (*execute)(struct AVCodecContext *c, int (*func)(struct AVCodecContext *c2, void *arg), void *arg2, int *ret, int count, int size);
2847
2848 /**
2849 * The codec may call this to execute several independent things.
2850 * It will return only after finishing all tasks.
2851 * The user may replace this with some multithreaded implementation,
2852 * the default implementation will execute the parts serially.
2853 * Also see avcodec_thread_init and e.g. the --enable-pthread configure option.
2854 * @param c context passed also to func
2855 * @param count the number of things to execute
2856 * @param arg2 argument passed unchanged to func
2857 * @param ret return values of executed functions, must have space for "count" values. May be NULL.
2858 * @param func function that will be called count times, with jobnr from 0 to count-1.
2859 * threadnr will be in the range 0 to c->thread_count-1 < MAX_THREADS and so that no
2860 * two instances of func executing at the same time will have the same threadnr.
2861 * @return always 0 currently, but code should handle a future improvement where when any call to func
2862 * returns < 0 no further calls to func may be done and < 0 is returned.
2863 * - encoding: Set by libavcodec, user can override.
2864 * - decoding: Set by libavcodec, user can override.
2865 */
2866 int (*execute2)(struct AVCodecContext *c, int (*func)(struct AVCodecContext *c2, void *arg, int jobnr, int threadnr), void *arg2, int *ret, int count);
2867
2868 /**
2869 * noise vs. sse weight for the nsse comparison function
2870 * - encoding: Set by user.
2871 * - decoding: unused
2872 */
2873 int nsse_weight;
2874
2875 /**
2876 * profile
2877 * - encoding: Set by user.
2878 * - decoding: Set by libavcodec.
2879 */
2880 int profile;
2881 #define FF_PROFILE_UNKNOWN -99
2882 #define FF_PROFILE_RESERVED -100
2883
2884 #define FF_PROFILE_AAC_MAIN 0
2885 #define FF_PROFILE_AAC_LOW 1
2886 #define FF_PROFILE_AAC_SSR 2
2887 #define FF_PROFILE_AAC_LTP 3
2888 #define FF_PROFILE_AAC_HE 4
2889 #define FF_PROFILE_AAC_HE_V2 28
2890 #define FF_PROFILE_AAC_LD 22
2891 #define FF_PROFILE_AAC_ELD 38
2892 #define FF_PROFILE_MPEG2_AAC_LOW 128
2893 #define FF_PROFILE_MPEG2_AAC_HE 131
2894
2895 #define FF_PROFILE_DTS 20
2896 #define FF_PROFILE_DTS_ES 30
2897 #define FF_PROFILE_DTS_96_24 40
2898 #define FF_PROFILE_DTS_HD_HRA 50
2899 #define FF_PROFILE_DTS_HD_MA 60
2900 #define FF_PROFILE_DTS_EXPRESS 70
2901
2902 #define FF_PROFILE_MPEG2_422 0
2903 #define FF_PROFILE_MPEG2_HIGH 1
2904 #define FF_PROFILE_MPEG2_SS 2
2905 #define FF_PROFILE_MPEG2_SNR_SCALABLE 3
2906 #define FF_PROFILE_MPEG2_MAIN 4
2907 #define FF_PROFILE_MPEG2_SIMPLE 5
2908
2909 #define FF_PROFILE_H264_CONSTRAINED (1<<9) // 8+1; constraint_set1_flag
2910 #define FF_PROFILE_H264_INTRA (1<<11) // 8+3; constraint_set3_flag
2911
2912 #define FF_PROFILE_H264_BASELINE 66
2913 #define FF_PROFILE_H264_CONSTRAINED_BASELINE (66|FF_PROFILE_H264_CONSTRAINED)
2914 #define FF_PROFILE_H264_MAIN 77
2915 #define FF_PROFILE_H264_EXTENDED 88
2916 #define FF_PROFILE_H264_HIGH 100
2917 #define FF_PROFILE_H264_HIGH_10 110
2918 #define FF_PROFILE_H264_HIGH_10_INTRA (110|FF_PROFILE_H264_INTRA)
2919 #define FF_PROFILE_H264_MULTIVIEW_HIGH 118
2920 #define FF_PROFILE_H264_HIGH_422 122
2921 #define FF_PROFILE_H264_HIGH_422_INTRA (122|FF_PROFILE_H264_INTRA)
2922 #define FF_PROFILE_H264_STEREO_HIGH 128
2923 #define FF_PROFILE_H264_HIGH_444 144
2924 #define FF_PROFILE_H264_HIGH_444_PREDICTIVE 244
2925 #define FF_PROFILE_H264_HIGH_444_INTRA (244|FF_PROFILE_H264_INTRA)
2926 #define FF_PROFILE_H264_CAVLC_444 44
2927
2928 #define FF_PROFILE_VC1_SIMPLE 0
2929 #define FF_PROFILE_VC1_MAIN 1
2930 #define FF_PROFILE_VC1_COMPLEX 2
2931 #define FF_PROFILE_VC1_ADVANCED 3
2932
2933 #define FF_PROFILE_MPEG4_SIMPLE 0
2934 #define FF_PROFILE_MPEG4_SIMPLE_SCALABLE 1
2935 #define FF_PROFILE_MPEG4_CORE 2
2936 #define FF_PROFILE_MPEG4_MAIN 3
2937 #define FF_PROFILE_MPEG4_N_BIT 4
2938 #define FF_PROFILE_MPEG4_SCALABLE_TEXTURE 5
2939 #define FF_PROFILE_MPEG4_SIMPLE_FACE_ANIMATION 6
2940 #define FF_PROFILE_MPEG4_BASIC_ANIMATED_TEXTURE 7
2941 #define FF_PROFILE_MPEG4_HYBRID 8
2942 #define FF_PROFILE_MPEG4_ADVANCED_REAL_TIME 9
2943 #define FF_PROFILE_MPEG4_CORE_SCALABLE 10
2944 #define FF_PROFILE_MPEG4_ADVANCED_CODING 11
2945 #define FF_PROFILE_MPEG4_ADVANCED_CORE 12
2946 #define FF_PROFILE_MPEG4_ADVANCED_SCALABLE_TEXTURE 13
2947 #define FF_PROFILE_MPEG4_SIMPLE_STUDIO 14
2948 #define FF_PROFILE_MPEG4_ADVANCED_SIMPLE 15
2949
2950 #define FF_PROFILE_JPEG2000_CSTREAM_RESTRICTION_0 1
2951 #define FF_PROFILE_JPEG2000_CSTREAM_RESTRICTION_1 2
2952 #define FF_PROFILE_JPEG2000_CSTREAM_NO_RESTRICTION 32768
2953 #define FF_PROFILE_JPEG2000_DCINEMA_2K 3
2954 #define FF_PROFILE_JPEG2000_DCINEMA_4K 4
2955
2956 #define FF_PROFILE_VP9_0 0
2957 #define FF_PROFILE_VP9_1 1
2958 #define FF_PROFILE_VP9_2 2
2959 #define FF_PROFILE_VP9_3 3
2960
2961 #define FF_PROFILE_HEVC_MAIN 1
2962 #define FF_PROFILE_HEVC_MAIN_10 2
2963 #define FF_PROFILE_HEVC_MAIN_STILL_PICTURE 3
2964
2965 /**
2966 * level
2967 * - encoding: Set by user.
2968 * - decoding: Set by libavcodec.
2969 */
2970 int level;
2971 #define FF_LEVEL_UNKNOWN -99
2972
2973 /**
2974 * - encoding: unused
2975 * - decoding: Set by user.
2976 */
2977 enum AVDiscard skip_loop_filter;
2978
2979 /**
2980 * - encoding: unused
2981 * - decoding: Set by user.
2982 */
2983 enum AVDiscard skip_idct;
2984
2985 /**
2986 * - encoding: unused
2987 * - decoding: Set by user.
2988 */
2989 enum AVDiscard skip_frame;
2990
2991 /**
2992 * Header containing style information for text subtitles.
2993 * For SUBTITLE_ASS subtitle type, it should contain the whole ASS
2994 * [Script Info] and [V4+ Styles] section, plus the [Events] line and
2995 * the Format line following. It shouldn't include any Dialogue line.
2996 * - encoding: Set/allocated/freed by user (before avcodec_open2())
2997 * - decoding: Set/allocated/freed by libavcodec (by avcodec_open2())
2998 */
2999 uint8_t *subtitle_header;
3000 int subtitle_header_size;
3001
3002 #if FF_API_ERROR_RATE
3003 /**
3004 * @deprecated use the 'error_rate' private AVOption of the mpegvideo
3005 * encoders
3006 */
3007 attribute_deprecated
3008 int error_rate;
3009 #endif
3010
3011 #if FF_API_VBV_DELAY
3012 /**
3013 * VBV delay coded in the last frame (in periods of a 27 MHz clock).
3014 * Used for compliant TS muxing.
3015 * - encoding: Set by libavcodec.
3016 * - decoding: unused.
3017 * @deprecated this value is now exported as a part of
3018 * AV_PKT_DATA_CPB_PROPERTIES packet side data
3019 */
3020 attribute_deprecated
3021 uint64_t vbv_delay;
3022 #endif
3023
3024 #if FF_API_SIDEDATA_ONLY_PKT
3025 /**
3026 * Encoding only and set by default. Allow encoders to output packets
3027 * that do not contain any encoded data, only side data.
3028 *
3029 * Some encoders need to output such packets, e.g. to update some stream
3030 * parameters at the end of encoding.
3031 *
3032 * @deprecated this field disables the default behaviour and
3033 * it is kept only for compatibility.
3034 */
3035 attribute_deprecated
3036 int side_data_only_packets;
3037 #endif
3038
3039 /**
3040 * Audio only. The number of "priming" samples (padding) inserted by the
3041 * encoder at the beginning of the audio. I.e. this number of leading
3042 * decoded samples must be discarded by the caller to get the original audio
3043 * without leading padding.
3044 *
3045 * - decoding: unused
3046 * - encoding: Set by libavcodec. The timestamps on the output packets are
3047 * adjusted by the encoder so that they always refer to the
3048 * first sample of the data actually contained in the packet,
3049 * including any added padding. E.g. if the timebase is
3050 * 1/samplerate and the timestamp of the first input sample is
3051 * 0, the timestamp of the first output packet will be
3052 * -initial_padding.
3053 */
3054 int initial_padding;
3055
3056 /*
3057 * - decoding: For codecs that store a framerate value in the compressed
3058 * bitstream, the decoder may export it here. { 0, 1} when
3059 * unknown.
3060 * - encoding: May be used to signal the framerate of CFR content to an
3061 * encoder.
3062 */
3063 AVRational framerate;
3064
3065 /**
3066 * Nominal unaccelerated pixel format, see AV_PIX_FMT_xxx.
3067 * - encoding: unused.
3068 * - decoding: Set by libavcodec before calling get_format()
3069 */
3070 enum AVPixelFormat sw_pix_fmt;
3071
3072 /**
3073 * Additional data associated with the entire coded stream.
3074 *
3075 * - decoding: unused
3076 * - encoding: may be set by libavcodec after avcodec_open2().
3077 */
3078 AVPacketSideData *coded_side_data;
3079 int nb_coded_side_data;
3080
3081 /**
3082 * A reference to the AVHWFramesContext describing the input (for encoding)
3083 * or output (decoding) frames. The reference is set by the caller and
3084 * afterwards owned (and freed) by libavcodec.
3085 *
3086 * - decoding: This field should be set by the caller from the get_format()
3087 * callback. The previous reference (if any) will always be
3088 * unreffed by libavcodec before the get_format() call.
3089 *
3090 * If the default get_buffer2() is used with a hwaccel pixel
3091 * format, then this AVHWFramesContext will be used for
3092 * allocating the frame buffers.
3093 *
3094 * - encoding: For hardware encoders configured to use a hwaccel pixel
3095 * format, this field should be set by the caller to a reference
3096 * to the AVHWFramesContext describing input frames.
3097 * AVHWFramesContext.format must be equal to
3098 * AVCodecContext.pix_fmt.
3099 *
3100 * This field should be set before avcodec_open2() is called.
3101 */
3102 AVBufferRef *hw_frames_ctx;
3103 } AVCodecContext;
3104
3105 /**
3106 * AVProfile.
3107 */
3108 typedef struct AVProfile {
3109 int profile;
3110 const char *name; ///< short name for the profile
3111 } AVProfile;
3112
3113 typedef struct AVCodecDefault AVCodecDefault;
3114
3115 struct AVSubtitle;
3116
3117 /**
3118 * AVCodec.
3119 */
3120 typedef struct AVCodec {
3121 /**
3122 * Name of the codec implementation.
3123 * The name is globally unique among encoders and among decoders (but an
3124 * encoder and a decoder can share the same name).
3125 * This is the primary way to find a codec from the user perspective.
3126 */
3127 const char *name;
3128 /**
3129 * Descriptive name for the codec, meant to be more human readable than name.
3130 * You should use the NULL_IF_CONFIG_SMALL() macro to define it.
3131 */
3132 const char *long_name;
3133 enum AVMediaType type;
3134 enum AVCodecID id;
3135 /**
3136 * Codec capabilities.
3137 * see AV_CODEC_CAP_*
3138 */
3139 int capabilities;
3140 const AVRational *supported_framerates; ///< array of supported framerates, or NULL if any, array is terminated by {0,0}
3141 const enum AVPixelFormat *pix_fmts; ///< array of supported pixel formats, or NULL if unknown, array is terminated by -1
3142 const int *supported_samplerates; ///< array of supported audio samplerates, or NULL if unknown, array is terminated by 0
3143 const enum AVSampleFormat *sample_fmts; ///< array of supported sample formats, or NULL if unknown, array is terminated by -1
3144 const uint64_t *channel_layouts; ///< array of support channel layouts, or NULL if unknown. array is terminated by 0
3145 #if FF_API_LOWRES
3146 attribute_deprecated uint8_t max_lowres; ///< maximum value for lowres supported by the decoder
3147 #endif
3148 const AVClass *priv_class; ///< AVClass for the private context
3149 const AVProfile *profiles; ///< array of recognized profiles, or NULL if unknown, array is terminated by {FF_PROFILE_UNKNOWN}
3150
3151 /*****************************************************************
3152 * No fields below this line are part of the public API. They
3153 * may not be used outside of libavcodec and can be changed and
3154 * removed at will.
3155 * New public fields should be added right above.
3156 *****************************************************************
3157 */
3158 int priv_data_size;
3159 struct AVCodec *next;
3160 /**
3161 * @name Frame-level threading support functions
3162 * @{
3163 */
3164 /**
3165 * If defined, called on thread contexts when they are created.
3166 * If the codec allocates writable tables in init(), re-allocate them here.
3167 * priv_data will be set to a copy of the original.
3168 */
3169 int (*init_thread_copy)(AVCodecContext *);
3170 /**
3171 * Copy necessary context variables from a previous thread context to the current one.
3172 * If not defined, the next thread will start automatically; otherwise, the codec
3173 * must call ff_thread_finish_setup().
3174 *
3175 * dst and src will (rarely) point to the same context, in which case memcpy should be skipped.
3176 */
3177 int (*update_thread_context)(AVCodecContext *dst, const AVCodecContext *src);
3178 /** @} */
3179
3180 /**
3181 * Private codec-specific defaults.
3182 */
3183 const AVCodecDefault *defaults;
3184
3185 /**
3186 * Initialize codec static data, called from avcodec_register().
3187 */
3188 void (*init_static_data)(struct AVCodec *codec);
3189
3190 int (*init)(AVCodecContext *);
3191 int (*encode_sub)(AVCodecContext *, uint8_t *buf, int buf_size,
3192 const struct AVSubtitle *sub);
3193 /**
3194 * Encode data to an AVPacket.
3195 *
3196 * @param avctx codec context
3197 * @param avpkt output AVPacket (may contain a user-provided buffer)
3198 * @param[in] frame AVFrame containing the raw data to be encoded
3199 * @param[out] got_packet_ptr encoder sets to 0 or 1 to indicate that a
3200 * non-empty packet was returned in avpkt.
3201 * @return 0 on success, negative error code on failure
3202 */
3203 int (*encode2)(AVCodecContext *avctx, AVPacket *avpkt, const AVFrame *frame,
3204 int *got_packet_ptr);
3205 int (*decode)(AVCodecContext *, void *outdata, int *outdata_size, AVPacket *avpkt);
3206 int (*close)(AVCodecContext *);
3207 /**
3208 * Decode/encode API with decoupled packet/frame dataflow. The API is the
3209 * same as the avcodec_ prefixed APIs (avcodec_send_frame() etc.), except
3210 * that:
3211 * - never called if the codec is closed or the wrong type,
3212 * - AVPacket parameter change side data is applied right before calling
3213 * AVCodec->send_packet,
3214 * - if AV_CODEC_CAP_DELAY is not set, drain packets or frames are never sent,
3215 * - only one drain packet is ever passed down (until the next flush()),
3216 * - a drain AVPacket is always NULL (no need to check for avpkt->size).
3217 */
3218 int (*send_frame)(AVCodecContext *avctx, const AVFrame *frame);
3219 int (*send_packet)(AVCodecContext *avctx, const AVPacket *avpkt);
3220 int (*receive_frame)(AVCodecContext *avctx, AVFrame *frame);
3221 int (*receive_packet)(AVCodecContext *avctx, AVPacket *avpkt);
3222 /**
3223 * Flush buffers.
3224 * Will be called when seeking
3225 */
3226 void (*flush)(AVCodecContext *);
3227 /**
3228 * Internal codec capabilities.
3229 * See FF_CODEC_CAP_* in internal.h
3230 */
3231 int caps_internal;
3232 } AVCodec;
3233
3234 /**
3235 * @defgroup lavc_hwaccel AVHWAccel
3236 * @{
3237 */
3238 typedef struct AVHWAccel {
3239 /**
3240 * Name of the hardware accelerated codec.
3241 * The name is globally unique among encoders and among decoders (but an
3242 * encoder and a decoder can share the same name).
3243 */
3244 const char *name;
3245
3246 /**
3247 * Type of codec implemented by the hardware accelerator.
3248 *
3249 * See AVMEDIA_TYPE_xxx
3250 */
3251 enum AVMediaType type;
3252
3253 /**
3254 * Codec implemented by the hardware accelerator.
3255 *
3256 * See AV_CODEC_ID_xxx
3257 */
3258 enum AVCodecID id;
3259
3260 /**
3261 * Supported pixel format.
3262 *
3263 * Only hardware accelerated formats are supported here.
3264 */
3265 enum AVPixelFormat pix_fmt;
3266
3267 /**
3268 * Hardware accelerated codec capabilities.
3269 * see FF_HWACCEL_CODEC_CAP_*
3270 */
3271 int capabilities;
3272
3273 /*****************************************************************
3274 * No fields below this line are part of the public API. They
3275 * may not be used outside of libavcodec and can be changed and
3276 * removed at will.
3277 * New public fields should be added right above.
3278 *****************************************************************
3279 */
3280 struct AVHWAccel *next;
3281
3282 /**
3283 * Allocate a custom buffer
3284 */
3285 int (*alloc_frame)(AVCodecContext *avctx, AVFrame *frame);
3286
3287 /**
3288 * Called at the beginning of each frame or field picture.
3289 *
3290 * Meaningful frame information (codec specific) is guaranteed to
3291 * be parsed at this point. This function is mandatory.
3292 *
3293 * Note that buf can be NULL along with buf_size set to 0.
3294 * Otherwise, this means the whole frame is available at this point.
3295 *
3296 * @param avctx the codec context
3297 * @param buf the frame data buffer base
3298 * @param buf_size the size of the frame in bytes
3299 * @return zero if successful, a negative value otherwise
3300 */
3301 int (*start_frame)(AVCodecContext *avctx, const uint8_t *buf, uint32_t buf_size);
3302
3303 /**
3304 * Callback for each slice.
3305 *
3306 * Meaningful slice information (codec specific) is guaranteed to
3307 * be parsed at this point. This function is mandatory.
3308 *
3309 * @param avctx the codec context
3310 * @param buf the slice data buffer base
3311 * @param buf_size the size of the slice in bytes
3312 * @return zero if successful, a negative value otherwise
3313 */
3314 int (*decode_slice)(AVCodecContext *avctx, const uint8_t *buf, uint32_t buf_size);
3315
3316 /**
3317 * Called at the end of each frame or field picture.
3318 *
3319 * The whole picture is parsed at this point and can now be sent
3320 * to the hardware accelerator. This function is mandatory.
3321 *
3322 * @param avctx the codec context
3323 * @return zero if successful, a negative value otherwise
3324 */
3325 int (*end_frame)(AVCodecContext *avctx);
3326
3327 /**
3328 * Size of per-frame hardware accelerator private data.
3329 *
3330 * Private data is allocated with av_mallocz() before
3331 * AVCodecContext.get_buffer() and deallocated after
3332 * AVCodecContext.release_buffer().
3333 */
3334 int frame_priv_data_size;
3335
3336 /**
3337 * Initialize the hwaccel private data.
3338 *
3339 * This will be called from ff_get_format(), after hwaccel and
3340 * hwaccel_context are set and the hwaccel private data in AVCodecInternal
3341 * is allocated.
3342 */
3343 int (*init)(AVCodecContext *avctx);
3344
3345 /**
3346 * Uninitialize the hwaccel private data.
3347 *
3348 * This will be called from get_format() or avcodec_close(), after hwaccel
3349 * and hwaccel_context are already uninitialized.
3350 */
3351 int (*uninit)(AVCodecContext *avctx);
3352
3353 /**
3354 * Size of the private data to allocate in
3355 * AVCodecInternal.hwaccel_priv_data.
3356 */
3357 int priv_data_size;
3358 } AVHWAccel;
3359
3360 /**
3361 * Hardware acceleration should be used for decoding even if the codec level
3362 * used is unknown or higher than the maximum supported level reported by the
3363 * hardware driver.
3364 */
3365 #define AV_HWACCEL_FLAG_IGNORE_LEVEL (1 << 0)
3366
3367 /**
3368 * Hardware acceleration can output YUV pixel formats with a different chroma
3369 * sampling than 4:2:0 and/or other than 8 bits per component.
3370 */
3371 #define AV_HWACCEL_FLAG_ALLOW_HIGH_DEPTH (1 << 1)
3372
3373 /**
3374 * @}
3375 */
3376
3377 #if FF_API_AVPICTURE
3378 /**
3379 * @defgroup lavc_picture AVPicture
3380 *
3381 * Functions for working with AVPicture
3382 * @{
3383 */
3384
3385 /**
3386 * four components are given, that's all.
3387 * the last component is alpha
3388 * @deprecated Use the imgutils functions
3389 */
3390 typedef struct AVPicture {
3391 attribute_deprecated
3392 uint8_t *data[AV_NUM_DATA_POINTERS];
3393 attribute_deprecated
3394 int linesize[AV_NUM_DATA_POINTERS]; ///< number of bytes per line
3395 } AVPicture;
3396
3397 /**
3398 * @}
3399 */
3400 #endif
3401
3402 #define AVPALETTE_SIZE 1024
3403 #define AVPALETTE_COUNT 256
3404
3405 enum AVSubtitleType {
3406 SUBTITLE_NONE,
3407
3408 SUBTITLE_BITMAP, ///< A bitmap, pict will be set
3409
3410 /**
3411 * Plain text, the text field must be set by the decoder and is
3412 * authoritative. ass and pict fields may contain approximations.
3413 */
3414 SUBTITLE_TEXT,
3415
3416 /**
3417 * Formatted text, the ass field must be set by the decoder and is
3418 * authoritative. pict and text fields may contain approximations.
3419 */
3420 SUBTITLE_ASS,
3421 };
3422
3423 #define AV_SUBTITLE_FLAG_FORCED 0x00000001
3424
3425 typedef struct AVSubtitleRect {
3426 int x; ///< top left corner of pict, undefined when pict is not set
3427 int y; ///< top left corner of pict, undefined when pict is not set
3428 int w; ///< width of pict, undefined when pict is not set
3429 int h; ///< height of pict, undefined when pict is not set
3430 int nb_colors; ///< number of colors in pict, undefined when pict is not set
3431
3432 #if FF_API_AVPICTURE
3433 /**
3434 * @deprecated unused
3435 */
3436 attribute_deprecated
3437 AVPicture pict;
3438 #endif
3439 /**
3440 * data+linesize for the bitmap of this subtitle.
3441 * Can be set for text/ass as well once they are rendered.
3442 */
3443 uint8_t *data[4];
3444 int linesize[4];
3445
3446 enum AVSubtitleType type;
3447
3448 char *text; ///< 0 terminated plain UTF-8 text
3449
3450 /**
3451 * 0 terminated ASS/SSA compatible event line.
3452 * The presentation of this is unaffected by the other values in this
3453 * struct.
3454 */
3455 char *ass;
3456 int flags;
3457 } AVSubtitleRect;
3458
3459 typedef struct AVSubtitle {
3460 uint16_t format; /* 0 = graphics */
3461 uint32_t start_display_time; /* relative to packet pts, in ms */
3462 uint32_t end_display_time; /* relative to packet pts, in ms */
3463 unsigned num_rects;
3464 AVSubtitleRect **rects;
3465 int64_t pts; ///< Same as packet pts, in AV_TIME_BASE
3466 } AVSubtitle;
3467
3468 /**
3469 * This struct describes the properties of an encoded stream.
3470 *
3471 * sizeof(AVCodecParameters) is not a part of the public ABI, this struct must
3472 * be allocated with avcodec_parameters_alloc() and freed with
3473 * avcodec_parameters_free().
3474 */
3475 typedef struct AVCodecParameters {
3476 /**
3477 * General type of the encoded data.
3478 */
3479 enum AVMediaType codec_type;
3480 /**
3481 * Specific type of the encoded data (the codec used).
3482 */
3483 enum AVCodecID codec_id;
3484 /**
3485 * Additional information about the codec (corresponds to the AVI FOURCC).
3486 */
3487 uint32_t codec_tag;
3488
3489 /**
3490 * Extra binary data needed for initializing the decoder, codec-dependent.
3491 *
3492 * Must be allocated with av_malloc() and will be freed by
3493 * avcodec_parameters_free(). The allocated size of extradata must be at
3494 * least extradata_size + AV_INPUT_BUFFER_PADDING_SIZE, with the padding
3495 * bytes zeroed.
3496 */
3497 uint8_t *extradata;
3498 /**
3499 * Size of the extradata content in bytes.
3500 */
3501 int extradata_size;
3502
3503 /**
3504 * - video: the pixel format, the value corresponds to enum AVPixelFormat.
3505 * - audio: the sample format, the value corresponds to enum AVSampleFormat.
3506 */
3507 int format;
3508
3509 /**
3510 * The average bitrate of the encoded data (in bits per second).
3511 */
3512 int bit_rate;
3513
3514 int bits_per_coded_sample;
3515
3516 /**
3517 * Codec-specific bitstream restrictions that the stream conforms to.
3518 */
3519 int profile;
3520 int level;
3521
3522 /**
3523 * Video only. The dimensions of the video frame in pixels.
3524 */
3525 int width;
3526 int height;
3527
3528 /**
3529 * Video only. The aspect ratio (width / height) which a single pixel
3530 * should have when displayed.
3531 *
3532 * When the aspect ratio is unknown / undefined, the numerator should be
3533 * set to 0 (the denominator may have any value).
3534 */
3535 AVRational sample_aspect_ratio;
3536
3537 /**
3538 * Video only. The order of the fields in interlaced video.
3539 */
3540 enum AVFieldOrder field_order;
3541
3542 /**
3543 * Video only. Additional colorspace characteristics.
3544 */
3545 enum AVColorRange color_range;
3546 enum AVColorPrimaries color_primaries;
3547 enum AVColorTransferCharacteristic color_trc;
3548 enum AVColorSpace color_space;
3549 enum AVChromaLocation chroma_location;
3550
3551 /**
3552 * Audio only. The channel layout bitmask. May be 0 if the channel layout is
3553 * unknown or unspecified, otherwise the number of bits set must be equal to
3554 * the channels field.
3555 */
3556 uint64_t channel_layout;
3557 /**
3558 * Audio only. The number of audio channels.
3559 */
3560 int channels;
3561 /**
3562 * Audio only. The number of audio samples per second.
3563 */
3564 int sample_rate;
3565 /**
3566 * Audio only. The number of bytes per coded audio frame, required by some
3567 * formats.
3568 *
3569 * Corresponds to nBlockAlign in WAVEFORMATEX.
3570 */
3571 int block_align;
3572
3573 /**
3574 * Audio only. The amount of padding (in samples) inserted by the encoder at
3575 * the beginning of the audio. I.e. this number of leading decoded samples
3576 * must be discarded by the caller to get the original audio without leading
3577 * padding.
3578 */
3579 int initial_padding;
3580 /**
3581 * Audio only. The amount of padding (in samples) appended by the encoder to
3582 * the end of the audio. I.e. this number of decoded samples must be
3583 * discarded by the caller from the end of the stream to get the original
3584 * audio without any trailing padding.
3585 */
3586 int trailing_padding;
3587 } AVCodecParameters;
3588
3589 /**
3590 * If c is NULL, returns the first registered codec,
3591 * if c is non-NULL, returns the next registered codec after c,
3592 * or NULL if c is the last one.
3593 */
3594 AVCodec *av_codec_next(const AVCodec *c);
3595
3596 /**
3597 * Return the LIBAVCODEC_VERSION_INT constant.
3598 */
3599 unsigned avcodec_version(void);
3600
3601 /**
3602 * Return the libavcodec build-time configuration.
3603 */
3604 const char *avcodec_configuration(void);
3605
3606 /**
3607 * Return the libavcodec license.
3608 */
3609 const char *avcodec_license(void);
3610
3611 /**
3612 * Register the codec codec and initialize libavcodec.
3613 *
3614 * @warning either this function or avcodec_register_all() must be called
3615 * before any other libavcodec functions.
3616 *
3617 * @see avcodec_register_all()
3618 */
3619 void avcodec_register(AVCodec *codec);
3620
3621 /**
3622 * Register all the codecs, parsers and bitstream filters which were enabled at
3623 * configuration time. If you do not call this function you can select exactly
3624 * which formats you want to support, by using the individual registration
3625 * functions.
3626 *
3627 * @see avcodec_register
3628 * @see av_register_codec_parser
3629 * @see av_register_bitstream_filter
3630 */
3631 void avcodec_register_all(void);
3632
3633 /**
3634 * Allocate an AVCodecContext and set its fields to default values. The
3635 * resulting struct should be freed with avcodec_free_context().
3636 *
3637 * @param codec if non-NULL, allocate private data and initialize defaults
3638 * for the given codec. It is illegal to then call avcodec_open2()
3639 * with a different codec.
3640 * If NULL, then the codec-specific defaults won't be initialized,
3641 * which may result in suboptimal default settings (this is
3642 * important mainly for encoders, e.g. libx264).
3643 *
3644 * @return An AVCodecContext filled with default values or NULL on failure.
3645 */
3646 AVCodecContext *avcodec_alloc_context3(const AVCodec *codec);
3647
3648 /**
3649 * Free the codec context and everything associated with it and write NULL to
3650 * the provided pointer.
3651 */
3652 void avcodec_free_context(AVCodecContext **avctx);
3653
3654 #if FF_API_GET_CONTEXT_DEFAULTS
3655 /**
3656 * @deprecated This function should not be used, as closing and opening a codec
3657 * context multiple time is not supported. A new codec context should be
3658 * allocated for each new use.
3659 */
3660 int avcodec_get_context_defaults3(AVCodecContext *s, const AVCodec *codec);
3661 #endif
3662
3663 /**
3664 * Get the AVClass for AVCodecContext. It can be used in combination with
3665 * AV_OPT_SEARCH_FAKE_OBJ for examining options.
3666 *
3667 * @see av_opt_find().
3668 */
3669 const AVClass *avcodec_get_class(void);
3670
3671 #if FF_API_COPY_CONTEXT
3672 /**
3673 * Copy the settings of the source AVCodecContext into the destination
3674 * AVCodecContext. The resulting destination codec context will be
3675 * unopened, i.e. you are required to call avcodec_open2() before you
3676 * can use this AVCodecContext to decode/encode video/audio data.
3677 *
3678 * @param dest target codec context, should be initialized with
3679 * avcodec_alloc_context3(), but otherwise uninitialized
3680 * @param src source codec context
3681 * @return AVERROR() on error (e.g. memory allocation error), 0 on success
3682 *
3683 * @deprecated The semantics of this function are ill-defined and it should not
3684 * be used. If you need to transfer the stream parameters from one codec context
3685 * to another, use an intermediate AVCodecParameters instance and the
3686 * avcodec_parameters_from_context() / avcodec_parameters_to_context()
3687 * functions.
3688 */
3689 attribute_deprecated
3690 int avcodec_copy_context(AVCodecContext *dest, const AVCodecContext *src);
3691 #endif
3692
3693 /**
3694 * Allocate a new AVCodecParameters and set its fields to default values
3695 * (unknown/invalid/0). The returned struct must be freed with
3696 * avcodec_parameters_free().
3697 */
3698 AVCodecParameters *avcodec_parameters_alloc(void);
3699
3700 /**
3701 * Free an AVCodecParameters instance and everything associated with it and
3702 * write NULL to the supplied pointer.
3703 */
3704 void avcodec_parameters_free(AVCodecParameters **par);
3705
3706 /**
3707 * Copy the contents of src to dst. Any allocated fields in dst are freed and
3708 * replaced with newly allocated duplicates of the corresponding fields in src.
3709 *
3710 * @return >= 0 on success, a negative AVERROR code on failure.
3711 */
3712 int avcodec_parameters_copy(AVCodecParameters *dst, const AVCodecParameters *src);
3713
3714 /**
3715 * Fill the parameters struct based on the values from the supplied codec
3716 * context. Any allocated fields in par are freed and replaced with duplicates
3717 * of the corresponding fields in codec.
3718 *
3719 * @return >= 0 on success, a negative AVERROR code on failure
3720 */
3721 int avcodec_parameters_from_context(AVCodecParameters *par,
3722 const AVCodecContext *codec);
3723
3724 /**
3725 * Fill the codec context based on the values from the supplied codec
3726 * parameters. Any allocated fields in codec that have a corresponding field in
3727 * par are freed and replaced with duplicates of the corresponding field in par.
3728 * Fields in codec that do not have a counterpart in par are not touched.
3729 *
3730 * @return >= 0 on success, a negative AVERROR code on failure.
3731 */
3732 int avcodec_parameters_to_context(AVCodecContext *codec,
3733 const AVCodecParameters *par);
3734
3735 /**
3736 * Initialize the AVCodecContext to use the given AVCodec. Prior to using this
3737 * function the context has to be allocated with avcodec_alloc_context3().
3738 *
3739 * The functions avcodec_find_decoder_by_name(), avcodec_find_encoder_by_name(),
3740 * avcodec_find_decoder() and avcodec_find_encoder() provide an easy way for
3741 * retrieving a codec.
3742 *
3743 * @warning This function is not thread safe!
3744 *
3745 * @note Always call this function before using decoding routines (such as
3746 * @ref avcodec_receive_frame()).
3747 *
3748 * @code
3749 * avcodec_register_all();
3750 * av_dict_set(&opts, "b", "2.5M", 0);
3751 * codec = avcodec_find_decoder(AV_CODEC_ID_H264);
3752 * if (!codec)
3753 * exit(1);
3754 *
3755 * context = avcodec_alloc_context3(codec);
3756 *
3757 * if (avcodec_open2(context, codec, opts) < 0)
3758 * exit(1);
3759 * @endcode
3760 *
3761 * @param avctx The context to initialize.
3762 * @param codec The codec to open this context for. If a non-NULL codec has been
3763 * previously passed to avcodec_alloc_context3() or
3764 * for this context, then this parameter MUST be either NULL or
3765 * equal to the previously passed codec.
3766 * @param options A dictionary filled with AVCodecContext and codec-private options.
3767 * On return this object will be filled with options that were not found.
3768 *
3769 * @return zero on success, a negative value on error
3770 * @see avcodec_alloc_context3(), avcodec_find_decoder(), avcodec_find_encoder(),
3771 * av_dict_set(), av_opt_find().
3772 */
3773 int avcodec_open2(AVCodecContext *avctx, const AVCodec *codec, AVDictionary **options);
3774
3775 /**
3776 * Close a given AVCodecContext and free all the data associated with it
3777 * (but not the AVCodecContext itself).
3778 *
3779 * Calling this function on an AVCodecContext that hasn't been opened will free
3780 * the codec-specific data allocated in avcodec_alloc_context3() with a non-NULL
3781 * codec. Subsequent calls will do nothing.
3782 *
3783 * @note Do not use this function. Use avcodec_free_context() to destroy a
3784 * codec context (either open or closed). Opening and closing a codec context
3785 * multiple times is not supported anymore -- use multiple codec contexts
3786 * instead.
3787 */
3788 int avcodec_close(AVCodecContext *avctx);
3789
3790 /**
3791 * Free all allocated data in the given subtitle struct.
3792 *
3793 * @param sub AVSubtitle to free.
3794 */
3795 void avsubtitle_free(AVSubtitle *sub);
3796
3797 /**
3798 * @}
3799 */
3800
3801 /**
3802 * @addtogroup lavc_packet
3803 * @{
3804 */
3805
3806 /**
3807 * Allocate an AVPacket and set its fields to default values. The resulting
3808 * struct must be freed using av_packet_free().
3809 *
3810 * @return An AVPacket filled with default values or NULL on failure.
3811 *
3812 * @note this only allocates the AVPacket itself, not the data buffers. Those
3813 * must be allocated through other means such as av_new_packet.
3814 *
3815 * @see av_new_packet
3816 */
3817 AVPacket *av_packet_alloc(void);
3818
3819 /**
3820 * Create a new packet that references the same data as src.
3821 *
3822 * This is a shortcut for av_packet_alloc()+av_packet_ref().
3823 *
3824 * @return newly created AVPacket on success, NULL on error.
3825 *
3826 * @see av_packet_alloc
3827 * @see av_packet_ref
3828 */
3829 AVPacket *av_packet_clone(AVPacket *src);
3830
3831 /**
3832 * Free the packet, if the packet is reference counted, it will be
3833 * unreferenced first.
3834 *
3835 * @param packet packet to be freed. The pointer will be set to NULL.
3836 * @note passing NULL is a no-op.
3837 */
3838 void av_packet_free(AVPacket **pkt);
3839
3840 /**
3841 * Initialize optional fields of a packet with default values.
3842 *
3843 * Note, this does not touch the data and size members, which have to be
3844 * initialized separately.
3845 *
3846 * @param pkt packet
3847 */
3848 void av_init_packet(AVPacket *pkt);
3849
3850 /**
3851 * Allocate the payload of a packet and initialize its fields with
3852 * default values.
3853 *
3854 * @param pkt packet
3855 * @param size wanted payload size
3856 * @return 0 if OK, AVERROR_xxx otherwise
3857 */
3858 int av_new_packet(AVPacket *pkt, int size);
3859
3860 /**
3861 * Reduce packet size, correctly zeroing padding
3862 *
3863 * @param pkt packet
3864 * @param size new size
3865 */
3866 void av_shrink_packet(AVPacket *pkt, int size);
3867
3868 /**
3869 * Increase packet size, correctly zeroing padding
3870 *
3871 * @param pkt packet
3872 * @param grow_by number of bytes by which to increase the size of the packet
3873 */
3874 int av_grow_packet(AVPacket *pkt, int grow_by);
3875
3876 /**
3877 * Initialize a reference-counted packet from av_malloc()ed data.
3878 *
3879 * @param pkt packet to be initialized. This function will set the data, size,
3880 * buf and destruct fields, all others are left untouched.
3881 * @param data Data allocated by av_malloc() to be used as packet data. If this
3882 * function returns successfully, the data is owned by the underlying AVBuffer.
3883 * The caller may not access the data through other means.
3884 * @param size size of data in bytes, without the padding. I.e. the full buffer
3885 * size is assumed to be size + AV_INPUT_BUFFER_PADDING_SIZE.
3886 *
3887 * @return 0 on success, a negative AVERROR on error
3888 */
3889 int av_packet_from_data(AVPacket *pkt, uint8_t *data, int size);
3890
3891 #if FF_API_AVPACKET_OLD_API
3892 /**
3893 * @warning This is a hack - the packet memory allocation stuff is broken. The
3894 * packet is allocated if it was not really allocated.
3895 *
3896 * @deprecated Use av_packet_ref
3897 */
3898 attribute_deprecated
3899 int av_dup_packet(AVPacket *pkt);
3900 /**
3901 * Free a packet.
3902 *
3903 * @deprecated Use av_packet_unref
3904 *
3905 * @param pkt packet to free
3906 */
3907 attribute_deprecated
3908 void av_free_packet(AVPacket *pkt);
3909 #endif
3910 /**
3911 * Allocate new information of a packet.
3912 *
3913 * @param pkt packet
3914 * @param type side information type
3915 * @param size side information size
3916 * @return pointer to fresh allocated data or NULL otherwise
3917 */
3918 uint8_t* av_packet_new_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
3919 int size);
3920
3921 /**
3922 * Wrap an existing array as a packet side data.
3923 *
3924 * @param pkt packet
3925 * @param type side information type
3926 * @param data the side data array. It must be allocated with the av_malloc()
3927 * family of functions. The ownership of the data is transferred to
3928 * pkt.
3929 * @param size side information size
3930 * @return a non-negative number on success, a negative AVERROR code on
3931 * failure. On failure, the packet is unchanged and the data remains
3932 * owned by the caller.
3933 */
3934 int av_packet_add_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
3935 uint8_t *data, size_t size);
3936
3937 /**
3938 * Shrink the already allocated side data buffer
3939 *
3940 * @param pkt packet
3941 * @param type side information type
3942 * @param size new side information size
3943 * @return 0 on success, < 0 on failure
3944 */
3945 int av_packet_shrink_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
3946 int size);
3947
3948 /**
3949 * Get side information from packet.
3950 *
3951 * @param pkt packet
3952 * @param type desired side information type
3953 * @param size pointer for side information size to store (optional)
3954 * @return pointer to data if present or NULL otherwise
3955 */
3956 uint8_t* av_packet_get_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
3957 int *size);
3958
3959 /**
3960 * Convenience function to free all the side data stored.
3961 * All the other fields stay untouched.
3962 *
3963 * @param pkt packet
3964 */
3965 void av_packet_free_side_data(AVPacket *pkt);
3966
3967 /**
3968 * Setup a new reference to the data described by a given packet
3969 *
3970 * If src is reference-counted, setup dst as a new reference to the
3971 * buffer in src. Otherwise allocate a new buffer in dst and copy the
3972 * data from src into it.
3973 *
3974 * All the other fields are copied from src.
3975 *
3976 * @see av_packet_unref
3977 *
3978 * @param dst Destination packet
3979 * @param src Source packet
3980 *
3981 * @return 0 on success, a negative AVERROR on error.
3982 */
3983 int av_packet_ref(AVPacket *dst, AVPacket *src);
3984
3985 /**
3986 * Wipe the packet.
3987 *
3988 * Unreference the buffer referenced by the packet and reset the
3989 * remaining packet fields to their default values.
3990 *
3991 * @param pkt The packet to be unreferenced.
3992 */
3993 void av_packet_unref(AVPacket *pkt);
3994
3995 /**
3996 * Move every field in src to dst and reset src.
3997 *
3998 * @see av_packet_unref
3999 *
4000 * @param src Source packet, will be reset
4001 * @param dst Destination packet
4002 */
4003 void av_packet_move_ref(AVPacket *dst, AVPacket *src);
4004
4005 /**
4006 * Copy only "properties" fields from src to dst.
4007 *
4008 * Properties for the purpose of this function are all the fields
4009 * beside those related to the packet data (buf, data, size)
4010 *
4011 * @param dst Destination packet
4012 * @param src Source packet
4013 *
4014 * @return 0 on success AVERROR on failure.
4015 */
4016 int av_packet_copy_props(AVPacket *dst, const AVPacket *src);
4017
4018 /**
4019 * Convert valid timing fields (timestamps / durations) in a packet from one
4020 * timebase to another. Timestamps with unknown values (AV_NOPTS_VALUE) will be
4021 * ignored.
4022 *
4023 * @param pkt packet on which the conversion will be performed
4024 * @param tb_src source timebase, in which the timing fields in pkt are
4025 * expressed
4026 * @param tb_dst destination timebase, to which the timing fields will be
4027 * converted
4028 */
4029 void av_packet_rescale_ts(AVPacket *pkt, AVRational tb_src, AVRational tb_dst);
4030
4031 /**
4032 * @}
4033 */
4034
4035 /**
4036 * @addtogroup lavc_decoding
4037 * @{
4038 */
4039
4040 /**
4041 * Find a registered decoder with a matching codec ID.
4042 *
4043 * @param id AVCodecID of the requested decoder
4044 * @return A decoder if one was found, NULL otherwise.
4045 */
4046 AVCodec *avcodec_find_decoder(enum AVCodecID id);
4047
4048 /**
4049 * Find a registered decoder with the specified name.
4050 *
4051 * @param name name of the requested decoder
4052 * @return A decoder if one was found, NULL otherwise.
4053 */
4054 AVCodec *avcodec_find_decoder_by_name(const char *name);
4055
4056 /**
4057 * The default callback for AVCodecContext.get_buffer2(). It is made public so
4058 * it can be called by custom get_buffer2() implementations for decoders without
4059 * AV_CODEC_CAP_DR1 set.
4060 */
4061 int avcodec_default_get_buffer2(AVCodecContext *s, AVFrame *frame, int flags);
4062
4063 #if FF_API_EMU_EDGE
4064 /**
4065 * Return the amount of padding in pixels which the get_buffer callback must
4066 * provide around the edge of the image for codecs which do not have the
4067 * CODEC_FLAG_EMU_EDGE flag.
4068 *
4069 * @return Required padding in pixels.
4070 *
4071 * @deprecated CODEC_FLAG_EMU_EDGE is deprecated, so this function is no longer
4072 * needed
4073 */
4074 attribute_deprecated
4075 unsigned avcodec_get_edge_width(void);
4076 #endif
4077
4078 /**
4079 * Modify width and height values so that they will result in a memory
4080 * buffer that is acceptable for the codec if you do not use any horizontal
4081 * padding.
4082 *
4083 * May only be used if a codec with AV_CODEC_CAP_DR1 has been opened.
4084 */
4085 void avcodec_align_dimensions(AVCodecContext *s, int *width, int *height);
4086
4087 /**
4088 * Modify width and height values so that they will result in a memory
4089 * buffer that is acceptable for the codec if you also ensure that all
4090 * line sizes are a multiple of the respective linesize_align[i].
4091 *
4092 * May only be used if a codec with AV_CODEC_CAP_DR1 has been opened.
4093 */
4094 void avcodec_align_dimensions2(AVCodecContext *s, int *width, int *height,
4095 int linesize_align[AV_NUM_DATA_POINTERS]);
4096
4097 /**
4098 * Decode the audio frame of size avpkt->size from avpkt->data into frame.
4099 *
4100 * Some decoders may support multiple frames in a single AVPacket. Such
4101 * decoders would then just decode the first frame and the return value would be
4102 * less than the packet size. In this case, avcodec_decode_audio4 has to be
4103 * called again with an AVPacket containing the remaining data in order to
4104 * decode the second frame, etc... Even if no frames are returned, the packet
4105 * needs to be fed to the decoder with remaining data until it is completely
4106 * consumed or an error occurs.
4107 *
4108 * Some decoders (those marked with AV_CODEC_CAP_DELAY) have a delay between input
4109 * and output. This means that for some packets they will not immediately
4110 * produce decoded output and need to be flushed at the end of decoding to get
4111 * all the decoded data. Flushing is done by calling this function with packets
4112 * with avpkt->data set to NULL and avpkt->size set to 0 until it stops
4113 * returning samples. It is safe to flush even those decoders that are not
4114 * marked with AV_CODEC_CAP_DELAY, then no samples will be returned.
4115 *
4116 * @warning The input buffer, avpkt->data must be AV_INPUT_BUFFER_PADDING_SIZE
4117 * larger than the actual read bytes because some optimized bitstream
4118 * readers read 32 or 64 bits at once and could read over the end.
4119 *
4120 * @note The AVCodecContext MUST have been opened with @ref avcodec_open2()
4121 * before packets may be fed to the decoder.
4122 *
4123 * @param avctx the codec context
4124 * @param[out] frame The AVFrame in which to store decoded audio samples.
4125 * The decoder will allocate a buffer for the decoded frame by
4126 * calling the AVCodecContext.get_buffer2() callback.
4127 * When AVCodecContext.refcounted_frames is set to 1, the frame is
4128 * reference counted and the returned reference belongs to the
4129 * caller. The caller must release the frame using av_frame_unref()
4130 * when the frame is no longer needed. The caller may safely write
4131 * to the frame if av_frame_is_writable() returns 1.
4132 * When AVCodecContext.refcounted_frames is set to 0, the returned
4133 * reference belongs to the decoder and is valid only until the
4134 * next call to this function or until closing or flushing the
4135 * decoder. The caller may not write to it.
4136 * @param[out] got_frame_ptr Zero if no frame could be decoded, otherwise it is
4137 * non-zero. Note that this field being set to zero
4138 * does not mean that an error has occurred. For
4139 * decoders with AV_CODEC_CAP_DELAY set, no given decode
4140 * call is guaranteed to produce a frame.
4141 * @param[in] avpkt The input AVPacket containing the input buffer.
4142 * At least avpkt->data and avpkt->size should be set. Some
4143 * decoders might also require additional fields to be set.
4144 * @return A negative error code is returned if an error occurred during
4145 * decoding, otherwise the number of bytes consumed from the input
4146 * AVPacket is returned.
4147 *
4148 * @deprecated Use avcodec_send_packet() and avcodec_receive_frame().
4149 */
4150 attribute_deprecated
4151 int avcodec_decode_audio4(AVCodecContext *avctx, AVFrame *frame,
4152 int *got_frame_ptr, AVPacket *avpkt);
4153
4154 /**
4155 * Decode the video frame of size avpkt->size from avpkt->data into picture.
4156 * Some decoders may support multiple frames in a single AVPacket, such
4157 * decoders would then just decode the first frame.
4158 *
4159 * @warning The input buffer must be AV_INPUT_BUFFER_PADDING_SIZE larger than
4160 * the actual read bytes because some optimized bitstream readers read 32 or 64
4161 * bits at once and could read over the end.
4162 *
4163 * @warning The end of the input buffer buf should be set to 0 to ensure that
4164 * no overreading happens for damaged MPEG streams.
4165 *
4166 * @note Codecs which have the AV_CODEC_CAP_DELAY capability set have a delay
4167 * between input and output, these need to be fed with avpkt->data=NULL,
4168 * avpkt->size=0 at the end to return the remaining frames.
4169 *
4170 * @note The AVCodecContext MUST have been opened with @ref avcodec_open2()
4171 * before packets may be fed to the decoder.
4172 *
4173 * @param avctx the codec context
4174 * @param[out] picture The AVFrame in which the decoded video frame will be stored.
4175 * Use av_frame_alloc() to get an AVFrame. The codec will
4176 * allocate memory for the actual bitmap by calling the
4177 * AVCodecContext.get_buffer2() callback.
4178 * When AVCodecContext.refcounted_frames is set to 1, the frame is
4179 * reference counted and the returned reference belongs to the
4180 * caller. The caller must release the frame using av_frame_unref()
4181 * when the frame is no longer needed. The caller may safely write
4182 * to the frame if av_frame_is_writable() returns 1.
4183 * When AVCodecContext.refcounted_frames is set to 0, the returned
4184 * reference belongs to the decoder and is valid only until the
4185 * next call to this function or until closing or flushing the
4186 * decoder. The caller may not write to it.
4187 *
4188 * @param[in] avpkt The input AVPacket containing the input buffer.
4189 * You can create such packet with av_init_packet() and by then setting
4190 * data and size, some decoders might in addition need other fields like
4191 * flags&AV_PKT_FLAG_KEY. All decoders are designed to use the least
4192 * fields possible.
4193 * @param[in,out] got_picture_ptr Zero if no frame could be decompressed, otherwise, it is nonzero.
4194 * @return On error a negative value is returned, otherwise the number of bytes
4195 * used or zero if no frame could be decompressed.
4196 *
4197 * @deprecated Use avcodec_send_packet() and avcodec_receive_frame().
4198 */
4199 attribute_deprecated
4200 int avcodec_decode_video2(AVCodecContext *avctx, AVFrame *picture,
4201 int *got_picture_ptr,
4202 AVPacket *avpkt);
4203
4204 /**
4205 * Decode a subtitle message.
4206 * Return a negative value on error, otherwise return the number of bytes used.
4207 * If no subtitle could be decompressed, got_sub_ptr is zero.
4208 * Otherwise, the subtitle is stored in *sub.
4209 * Note that AV_CODEC_CAP_DR1 is not available for subtitle codecs. This is for
4210 * simplicity, because the performance difference is expect to be negligible
4211 * and reusing a get_buffer written for video codecs would probably perform badly
4212 * due to a potentially very different allocation pattern.
4213 *
4214 * @note The AVCodecContext MUST have been opened with @ref avcodec_open2()
4215 * before packets may be fed to the decoder.
4216 *
4217 * @param avctx the codec context
4218 * @param[out] sub The AVSubtitle in which the decoded subtitle will be stored, must be
4219 freed with avsubtitle_free if *got_sub_ptr is set.
4220 * @param[in,out] got_sub_ptr Zero if no subtitle could be decompressed, otherwise, it is nonzero.
4221 * @param[in] avpkt The input AVPacket containing the input buffer.
4222 */
4223 int avcodec_decode_subtitle2(AVCodecContext *avctx, AVSubtitle *sub,
4224 int *got_sub_ptr,
4225 AVPacket *avpkt);
4226
4227 /**
4228 * Supply raw packet data as input to a decoder.
4229 *
4230 * Internally, this call will copy relevant AVCodecContext fields, which can
4231 * influence decoding per-packet, and apply them when the packet is actually
4232 * decoded. (For example AVCodecContext.skip_frame, which might direct the
4233 * decoder to drop the frame contained by the packet sent with this function.)
4234 *
4235 * @warning The input buffer, avpkt->data must be AV_INPUT_BUFFER_PADDING_SIZE
4236 * larger than the actual read bytes because some optimized bitstream
4237 * readers read 32 or 64 bits at once and could read over the end.
4238 *
4239 * @warning Do not mix this API with the legacy API (like avcodec_decode_video2())
4240 * on the same AVCodecContext. It will return unexpected results now
4241 * or in future libavcodec versions.
4242 *
4243 * @note The AVCodecContext MUST have been opened with @ref avcodec_open2()
4244 * before packets may be fed to the decoder.
4245 *
4246 * @param avctx codec context
4247 * @param[in] avpkt The input AVPacket. Usually, this will be a single video
4248 * frame, or several complete audio frames.
4249 * Ownership of the packet remains with the caller, and the
4250 * decoder will not write to the packet. The decoder may create
4251 * a reference to the packet data (or copy it if the packet is
4252 * not reference-counted).
4253 * Unlike with older APIs, the packet is always fully consumed,
4254 * and if it contains multiple frames (e.g. some audio codecs),
4255 * will require you to call avcodec_receive_frame() multiple
4256 * times afterwards before you can send a new packet.
4257 * It can be NULL (or an AVPacket with data set to NULL and
4258 * size set to 0); in this case, it is considered a flush
4259 * packet, which signals the end of the stream. Sending the
4260 * first flush packet will return success. Subsequent ones are
4261 * unnecessary and will return AVERROR_EOF. If the decoder
4262 * still has frames buffered, it will return them after sending
4263 * a flush packet.
4264 *
4265 * @return 0 on success, otherwise negative error code:
4266 * AVERROR(EAGAIN): input is not accepted right now - the packet must be
4267 * resent after trying to read output
4268 * AVERROR_EOF: the decoder has been flushed, and no new packets can
4269 * be sent to it (also returned if more than 1 flush
4270 * packet is sent)
4271 * AVERROR(EINVAL): codec not opened, it is an encoder, or requires flush
4272 * AVERROR(ENOMEM): failed to add packet to internal queue, or similar
4273 * other errors: legitimate decoding errors
4274 */
4275 int avcodec_send_packet(AVCodecContext *avctx, const AVPacket *avpkt);
4276
4277 /**
4278 * Return decoded output data from a decoder.
4279 *
4280 * @param avctx codec context
4281 * @param frame This will be set to a reference-counted video or audio
4282 * frame (depending on the decoder type) allocated by the
4283 * decoder. Note that the function will always call
4284 * av_frame_unref(frame) before doing anything else.
4285 *
4286 * @return
4287 * 0: success, a frame was returned
4288 * AVERROR(EAGAIN): output is not available right now - user must try
4289 * to send new input
4290 * AVERROR_EOF: the decoder has been fully flushed, and there will be
4291 * no more output frames
4292 * AVERROR(EINVAL): codec not opened, or it is an encoder
4293 * other negative values: legitimate decoding errors
4294 */
4295 int avcodec_receive_frame(AVCodecContext *avctx, AVFrame *frame);
4296
4297 /**
4298 * Supply a raw video or audio frame to the encoder. Use avcodec_receive_packet()
4299 * to retrieve buffered output packets.
4300 *
4301 * @param avctx codec context
4302 * @param[in] frame AVFrame containing the raw audio or video frame to be encoded.
4303 * Ownership of the frame remains with the caller, and the
4304 * encoder will not write to the frame. The encoder may create
4305 * a reference to the frame data (or copy it if the frame is
4306 * not reference-counted).
4307 * It can be NULL, in which case it is considered a flush
4308 * packet. This signals the end of the stream. If the encoder
4309 * still has packets buffered, it will return them after this
4310 * call. Once flushing mode has been entered, additional flush
4311 * packets are ignored, and sending frames will return
4312 * AVERROR_EOF.
4313 *
4314 * For audio:
4315 * If AV_CODEC_CAP_VARIABLE_FRAME_SIZE is set, then each frame
4316 * can have any number of samples.
4317 * If it is not set, frame->nb_samples must be equal to
4318 * avctx->frame_size for all frames except the last.
4319 * The final frame may be smaller than avctx->frame_size.
4320 * @return 0 on success, otherwise negative error code:
4321 * AVERROR(EAGAIN): input is not accepted right now - the frame must be
4322 * resent after trying to read output packets
4323 * AVERROR_EOF: the encoder has been flushed, and no new frames can
4324 * be sent to it
4325 * AVERROR(EINVAL): codec not opened, refcounted_frames not set, it is a
4326 * decoder, or requires flush
4327 * AVERROR(ENOMEM): failed to add packet to internal queue, or similar
4328 * other errors: legitimate decoding errors
4329 */
4330 int avcodec_send_frame(AVCodecContext *avctx, const AVFrame *frame);
4331
4332 /**
4333 * Read encoded data from the encoder.
4334 *
4335 * @param avctx codec context
4336 * @param avpkt This will be set to a reference-counted packet allocated by the
4337 * encoder. Note that the function will always call
4338 * av_frame_unref(frame) before doing anything else.
4339 * @return 0 on success, otherwise negative error code:
4340 * AVERROR(EAGAIN): output is not available right now - user must try
4341 * to send input
4342 * AVERROR_EOF: the encoder has been fully flushed, and there will be
4343 * no more output packets
4344 * AVERROR(EINVAL): codec not opened, or it is an encoder
4345 * other errors: legitimate decoding errors
4346 */
4347 int avcodec_receive_packet(AVCodecContext *avctx, AVPacket *avpkt);
4348
4349
4350 /**
4351 * @defgroup lavc_parsing Frame parsing
4352 * @{
4353 */
4354
4355 enum AVPictureStructure {
4356 AV_PICTURE_STRUCTURE_UNKNOWN, //< unknown
4357 AV_PICTURE_STRUCTURE_TOP_FIELD, //< coded as top field
4358 AV_PICTURE_STRUCTURE_BOTTOM_FIELD, //< coded as bottom field
4359 AV_PICTURE_STRUCTURE_FRAME, //< coded as frame
4360 };
4361
4362 typedef struct AVCodecParserContext {
4363 void *priv_data;
4364 struct AVCodecParser *parser;
4365 int64_t frame_offset; /* offset of the current frame */
4366 int64_t cur_offset; /* current offset
4367 (incremented by each av_parser_parse()) */
4368 int64_t next_frame_offset; /* offset of the next frame */
4369 /* video info */
4370 int pict_type; /* XXX: Put it back in AVCodecContext. */
4371 /**
4372 * This field is used for proper frame duration computation in lavf.
4373 * It signals, how much longer the frame duration of the current frame
4374 * is compared to normal frame duration.
4375 *
4376 * frame_duration = (1 + repeat_pict) * time_base
4377 *
4378 * It is used by codecs like H.264 to display telecined material.
4379 */
4380 int repeat_pict; /* XXX: Put it back in AVCodecContext. */
4381 int64_t pts; /* pts of the current frame */
4382 int64_t dts; /* dts of the current frame */
4383
4384 /* private data */
4385 int64_t last_pts;
4386 int64_t last_dts;
4387 int fetch_timestamp;
4388
4389 #define AV_PARSER_PTS_NB 4
4390 int cur_frame_start_index;
4391 int64_t cur_frame_offset[AV_PARSER_PTS_NB];
4392 int64_t cur_frame_pts[AV_PARSER_PTS_NB];
4393 int64_t cur_frame_dts[AV_PARSER_PTS_NB];
4394
4395 int flags;
4396 #define PARSER_FLAG_COMPLETE_FRAMES 0x0001
4397 #define PARSER_FLAG_ONCE 0x0002
4398 /// Set if the parser has a valid file offset
4399 #define PARSER_FLAG_FETCHED_OFFSET 0x0004
4400
4401 int64_t offset; ///< byte offset from starting packet start
4402 int64_t cur_frame_end[AV_PARSER_PTS_NB];
4403
4404 /**
4405 * Set by parser to 1 for key frames and 0 for non-key frames.
4406 * It is initialized to -1, so if the parser doesn't set this flag,
4407 * old-style fallback using AV_PICTURE_TYPE_I picture type as key frames
4408 * will be used.
4409 */
4410 int key_frame;
4411
4412 #if FF_API_CONVERGENCE_DURATION
4413 /**
4414 * @deprecated unused
4415 */
4416 attribute_deprecated
4417 int64_t convergence_duration;
4418 #endif
4419
4420 // Timestamp generation support:
4421 /**
4422 * Synchronization point for start of timestamp generation.
4423 *
4424 * Set to >0 for sync point, 0 for no sync point and <0 for undefined
4425 * (default).
4426 *
4427 * For example, this corresponds to presence of H.264 buffering period
4428 * SEI message.
4429 */
4430 int dts_sync_point;
4431
4432 /**
4433 * Offset of the current timestamp against last timestamp sync point in
4434 * units of AVCodecContext.time_base.
4435 *
4436 * Set to INT_MIN when dts_sync_point unused. Otherwise, it must
4437 * contain a valid timestamp offset.
4438 *
4439 * Note that the timestamp of sync point has usually a nonzero
4440 * dts_ref_dts_delta, which refers to the previous sync point. Offset of
4441 * the next frame after timestamp sync point will be usually 1.
4442 *
4443 * For example, this corresponds to H.264 cpb_removal_delay.
4444 */
4445 int dts_ref_dts_delta;
4446
4447 /**
4448 * Presentation delay of current frame in units of AVCodecContext.time_base.
4449 *
4450 * Set to INT_MIN when dts_sync_point unused. Otherwise, it must
4451 * contain valid non-negative timestamp delta (presentation time of a frame
4452 * must not lie in the past).
4453 *
4454 * This delay represents the difference between decoding and presentation
4455 * time of the frame.
4456 *
4457 * For example, this corresponds to H.264 dpb_output_delay.
4458 */
4459 int pts_dts_delta;
4460
4461 /**
4462 * Position of the packet in file.
4463 *
4464 * Analogous to cur_frame_pts/dts
4465 */
4466 int64_t cur_frame_pos[AV_PARSER_PTS_NB];
4467
4468 /**
4469 * Byte position of currently parsed frame in stream.
4470 */
4471 int64_t pos;
4472
4473 /**
4474 * Previous frame byte position.
4475 */
4476 int64_t last_pos;
4477
4478 /**
4479 * Duration of the current frame.
4480 * For audio, this is in units of 1 / AVCodecContext.sample_rate.
4481 * For all other types, this is in units of AVCodecContext.time_base.
4482 */
4483 int duration;
4484
4485 enum AVFieldOrder field_order;
4486
4487 /**
4488 * Indicate whether a picture is coded as a frame, top field or bottom field.
4489 *
4490 * For example, H.264 field_pic_flag equal to 0 corresponds to
4491 * AV_PICTURE_STRUCTURE_FRAME. An H.264 picture with field_pic_flag
4492 * equal to 1 and bottom_field_flag equal to 0 corresponds to
4493 * AV_PICTURE_STRUCTURE_TOP_FIELD.
4494 */
4495 enum AVPictureStructure picture_structure;
4496
4497 /**
4498 * Picture number incremented in presentation or output order.
4499 * This field may be reinitialized at the first picture of a new sequence.
4500 *
4501 * For example, this corresponds to H.264 PicOrderCnt.
4502 */
4503 int output_picture_number;
4504
4505 /**
4506 * Dimensions of the decoded video intended for presentation.
4507 */
4508 int width;
4509 int height;
4510
4511 /**
4512 * Dimensions of the coded video.
4513 */
4514 int coded_width;
4515 int coded_height;
4516
4517 /**
4518 * The format of the coded data, corresponds to enum AVPixelFormat for video
4519 * and for enum AVSampleFormat for audio.
4520 *
4521 * Note that a decoder can have considerable freedom in how exactly it
4522 * decodes the data, so the format reported here might be different from the
4523 * one returned by a decoder.
4524 */
4525 int format;
4526 } AVCodecParserContext;
4527
4528 typedef struct AVCodecParser {
4529 int codec_ids[5]; /* several codec IDs are permitted */
4530 int priv_data_size;
4531 int (*parser_init)(AVCodecParserContext *s);
4532 /* This callback never returns an error, a negative value means that
4533 * the frame start was in a previous packet. */
4534 int (*parser_parse)(AVCodecParserContext *s,
4535 AVCodecContext *avctx,
4536 const uint8_t **poutbuf, int *poutbuf_size,
4537 const uint8_t *buf, int buf_size);
4538 void (*parser_close)(AVCodecParserContext *s);
4539 int (*split)(AVCodecContext *avctx, const uint8_t *buf, int buf_size);
4540 struct AVCodecParser *next;
4541 } AVCodecParser;
4542
4543 AVCodecParser *av_parser_next(const AVCodecParser *c);
4544
4545 void av_register_codec_parser(AVCodecParser *parser);
4546 AVCodecParserContext *av_parser_init(int codec_id);
4547
4548 /**
4549 * Parse a packet.
4550 *
4551 * @param s parser context.
4552 * @param avctx codec context.
4553 * @param poutbuf set to pointer to parsed buffer or NULL if not yet finished.
4554 * @param poutbuf_size set to size of parsed buffer or zero if not yet finished.
4555 * @param buf input buffer.
4556 * @param buf_size input length, to signal EOF, this should be 0 (so that the last frame can be output).
4557 * @param pts input presentation timestamp.
4558 * @param dts input decoding timestamp.
4559 * @param pos input byte position in stream.
4560 * @return the number of bytes of the input bitstream used.
4561 *
4562 * Example:
4563 * @code
4564 * while(in_len){
4565 * len = av_parser_parse2(myparser, AVCodecContext, &data, &size,
4566 * in_data, in_len,
4567 * pts, dts, pos);
4568 * in_data += len;
4569 * in_len -= len;
4570 *
4571 * if(size)
4572 * decode_frame(data, size);
4573 * }
4574 * @endcode
4575 */