lavc: Move context_model to codec private options
[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 /**
81 * @defgroup lavc_core Core functions/structures.
82 * @ingroup libavc
83 *
84 * Basic definitions, functions for querying libavcodec capabilities,
85 * allocating core structures, etc.
86 * @{
87 */
88
89
90 /**
91 * Identify the syntax and semantics of the bitstream.
92 * The principle is roughly:
93 * Two decoders with the same ID can decode the same streams.
94 * Two encoders with the same ID can encode compatible streams.
95 * There may be slight deviations from the principle due to implementation
96 * details.
97 *
98 * If you add a codec ID to this list, add it so that
99 * 1. no value of a existing codec ID changes (that would break ABI),
100 * 2. it is as close as possible to similar codecs.
101 *
102 * After adding new codec IDs, do not forget to add an entry to the codec
103 * descriptor list and bump libavcodec minor version.
104 */
105 enum AVCodecID {
106 AV_CODEC_ID_NONE,
107
108 /* video codecs */
109 AV_CODEC_ID_MPEG1VIDEO,
110 AV_CODEC_ID_MPEG2VIDEO, ///< preferred ID for MPEG-1/2 video decoding
111 #if FF_API_XVMC
112 AV_CODEC_ID_MPEG2VIDEO_XVMC,
113 #endif /* FF_API_XVMC */
114 AV_CODEC_ID_H261,
115 AV_CODEC_ID_H263,
116 AV_CODEC_ID_RV10,
117 AV_CODEC_ID_RV20,
118 AV_CODEC_ID_MJPEG,
119 AV_CODEC_ID_MJPEGB,
120 AV_CODEC_ID_LJPEG,
121 AV_CODEC_ID_SP5X,
122 AV_CODEC_ID_JPEGLS,
123 AV_CODEC_ID_MPEG4,
124 AV_CODEC_ID_RAWVIDEO,
125 AV_CODEC_ID_MSMPEG4V1,
126 AV_CODEC_ID_MSMPEG4V2,
127 AV_CODEC_ID_MSMPEG4V3,
128 AV_CODEC_ID_WMV1,
129 AV_CODEC_ID_WMV2,
130 AV_CODEC_ID_H263P,
131 AV_CODEC_ID_H263I,
132 AV_CODEC_ID_FLV1,
133 AV_CODEC_ID_SVQ1,
134 AV_CODEC_ID_SVQ3,
135 AV_CODEC_ID_DVVIDEO,
136 AV_CODEC_ID_HUFFYUV,
137 AV_CODEC_ID_CYUV,
138 AV_CODEC_ID_H264,
139 AV_CODEC_ID_INDEO3,
140 AV_CODEC_ID_VP3,
141 AV_CODEC_ID_THEORA,
142 AV_CODEC_ID_ASV1,
143 AV_CODEC_ID_ASV2,
144 AV_CODEC_ID_FFV1,
145 AV_CODEC_ID_4XM,
146 AV_CODEC_ID_VCR1,
147 AV_CODEC_ID_CLJR,
148 AV_CODEC_ID_MDEC,
149 AV_CODEC_ID_ROQ,
150 AV_CODEC_ID_INTERPLAY_VIDEO,
151 AV_CODEC_ID_XAN_WC3,
152 AV_CODEC_ID_XAN_WC4,
153 AV_CODEC_ID_RPZA,
154 AV_CODEC_ID_CINEPAK,
155 AV_CODEC_ID_WS_VQA,
156 AV_CODEC_ID_MSRLE,
157 AV_CODEC_ID_MSVIDEO1,
158 AV_CODEC_ID_IDCIN,
159 AV_CODEC_ID_8BPS,
160 AV_CODEC_ID_SMC,
161 AV_CODEC_ID_FLIC,
162 AV_CODEC_ID_TRUEMOTION1,
163 AV_CODEC_ID_VMDVIDEO,
164 AV_CODEC_ID_MSZH,
165 AV_CODEC_ID_ZLIB,
166 AV_CODEC_ID_QTRLE,
167 AV_CODEC_ID_TSCC,
168 AV_CODEC_ID_ULTI,
169 AV_CODEC_ID_QDRAW,
170 AV_CODEC_ID_VIXL,
171 AV_CODEC_ID_QPEG,
172 AV_CODEC_ID_PNG,
173 AV_CODEC_ID_PPM,
174 AV_CODEC_ID_PBM,
175 AV_CODEC_ID_PGM,
176 AV_CODEC_ID_PGMYUV,
177 AV_CODEC_ID_PAM,
178 AV_CODEC_ID_FFVHUFF,
179 AV_CODEC_ID_RV30,
180 AV_CODEC_ID_RV40,
181 AV_CODEC_ID_VC1,
182 AV_CODEC_ID_WMV3,
183 AV_CODEC_ID_LOCO,
184 AV_CODEC_ID_WNV1,
185 AV_CODEC_ID_AASC,
186 AV_CODEC_ID_INDEO2,
187 AV_CODEC_ID_FRAPS,
188 AV_CODEC_ID_TRUEMOTION2,
189 AV_CODEC_ID_BMP,
190 AV_CODEC_ID_CSCD,
191 AV_CODEC_ID_MMVIDEO,
192 AV_CODEC_ID_ZMBV,
193 AV_CODEC_ID_AVS,
194 AV_CODEC_ID_SMACKVIDEO,
195 AV_CODEC_ID_NUV,
196 AV_CODEC_ID_KMVC,
197 AV_CODEC_ID_FLASHSV,
198 AV_CODEC_ID_CAVS,
199 AV_CODEC_ID_JPEG2000,
200 AV_CODEC_ID_VMNC,
201 AV_CODEC_ID_VP5,
202 AV_CODEC_ID_VP6,
203 AV_CODEC_ID_VP6F,
204 AV_CODEC_ID_TARGA,
205 AV_CODEC_ID_DSICINVIDEO,
206 AV_CODEC_ID_TIERTEXSEQVIDEO,
207 AV_CODEC_ID_TIFF,
208 AV_CODEC_ID_GIF,
209 AV_CODEC_ID_DXA,
210 AV_CODEC_ID_DNXHD,
211 AV_CODEC_ID_THP,
212 AV_CODEC_ID_SGI,
213 AV_CODEC_ID_C93,
214 AV_CODEC_ID_BETHSOFTVID,
215 AV_CODEC_ID_PTX,
216 AV_CODEC_ID_TXD,
217 AV_CODEC_ID_VP6A,
218 AV_CODEC_ID_AMV,
219 AV_CODEC_ID_VB,
220 AV_CODEC_ID_PCX,
221 AV_CODEC_ID_SUNRAST,
222 AV_CODEC_ID_INDEO4,
223 AV_CODEC_ID_INDEO5,
224 AV_CODEC_ID_MIMIC,
225 AV_CODEC_ID_RL2,
226 AV_CODEC_ID_ESCAPE124,
227 AV_CODEC_ID_DIRAC,
228 AV_CODEC_ID_BFI,
229 AV_CODEC_ID_CMV,
230 AV_CODEC_ID_MOTIONPIXELS,
231 AV_CODEC_ID_TGV,
232 AV_CODEC_ID_TGQ,
233 AV_CODEC_ID_TQI,
234 AV_CODEC_ID_AURA,
235 AV_CODEC_ID_AURA2,
236 AV_CODEC_ID_V210X,
237 AV_CODEC_ID_TMV,
238 AV_CODEC_ID_V210,
239 AV_CODEC_ID_DPX,
240 AV_CODEC_ID_MAD,
241 AV_CODEC_ID_FRWU,
242 AV_CODEC_ID_FLASHSV2,
243 AV_CODEC_ID_CDGRAPHICS,
244 AV_CODEC_ID_R210,
245 AV_CODEC_ID_ANM,
246 AV_CODEC_ID_BINKVIDEO,
247 AV_CODEC_ID_IFF_ILBM,
248 AV_CODEC_ID_IFF_BYTERUN1,
249 AV_CODEC_ID_KGV1,
250 AV_CODEC_ID_YOP,
251 AV_CODEC_ID_VP8,
252 AV_CODEC_ID_PICTOR,
253 AV_CODEC_ID_ANSI,
254 AV_CODEC_ID_A64_MULTI,
255 AV_CODEC_ID_A64_MULTI5,
256 AV_CODEC_ID_R10K,
257 AV_CODEC_ID_MXPEG,
258 AV_CODEC_ID_LAGARITH,
259 AV_CODEC_ID_PRORES,
260 AV_CODEC_ID_JV,
261 AV_CODEC_ID_DFA,
262 AV_CODEC_ID_WMV3IMAGE,
263 AV_CODEC_ID_VC1IMAGE,
264 AV_CODEC_ID_UTVIDEO,
265 AV_CODEC_ID_BMV_VIDEO,
266 AV_CODEC_ID_VBLE,
267 AV_CODEC_ID_DXTORY,
268 AV_CODEC_ID_V410,
269 AV_CODEC_ID_XWD,
270 AV_CODEC_ID_CDXL,
271 AV_CODEC_ID_XBM,
272 AV_CODEC_ID_ZEROCODEC,
273 AV_CODEC_ID_MSS1,
274 AV_CODEC_ID_MSA1,
275 AV_CODEC_ID_TSCC2,
276 AV_CODEC_ID_MTS2,
277 AV_CODEC_ID_CLLC,
278 AV_CODEC_ID_MSS2,
279 AV_CODEC_ID_VP9,
280 AV_CODEC_ID_AIC,
281 AV_CODEC_ID_ESCAPE130,
282 AV_CODEC_ID_G2M,
283 AV_CODEC_ID_WEBP,
284 AV_CODEC_ID_HNM4_VIDEO,
285 AV_CODEC_ID_HEVC,
286 AV_CODEC_ID_FIC,
287 AV_CODEC_ID_ALIAS_PIX,
288 AV_CODEC_ID_BRENDER_PIX,
289 AV_CODEC_ID_PAF_VIDEO,
290 AV_CODEC_ID_EXR,
291 AV_CODEC_ID_VP7,
292 AV_CODEC_ID_SANM,
293 AV_CODEC_ID_SGIRLE,
294 AV_CODEC_ID_MVC1,
295 AV_CODEC_ID_MVC2,
296 AV_CODEC_ID_HQX,
297 AV_CODEC_ID_TDSC,
298 AV_CODEC_ID_HQ_HQA,
299 AV_CODEC_ID_HAP,
300 AV_CODEC_ID_DDS,
301 AV_CODEC_ID_DXV,
302 AV_CODEC_ID_SCREENPRESSO,
303 AV_CODEC_ID_RSCC,
304
305 /* various PCM "codecs" */
306 AV_CODEC_ID_FIRST_AUDIO = 0x10000, ///< A dummy id pointing at the start of audio codecs
307 AV_CODEC_ID_PCM_S16LE = 0x10000,
308 AV_CODEC_ID_PCM_S16BE,
309 AV_CODEC_ID_PCM_U16LE,
310 AV_CODEC_ID_PCM_U16BE,
311 AV_CODEC_ID_PCM_S8,
312 AV_CODEC_ID_PCM_U8,
313 AV_CODEC_ID_PCM_MULAW,
314 AV_CODEC_ID_PCM_ALAW,
315 AV_CODEC_ID_PCM_S32LE,
316 AV_CODEC_ID_PCM_S32BE,
317 AV_CODEC_ID_PCM_U32LE,
318 AV_CODEC_ID_PCM_U32BE,
319 AV_CODEC_ID_PCM_S24LE,
320 AV_CODEC_ID_PCM_S24BE,
321 AV_CODEC_ID_PCM_U24LE,
322 AV_CODEC_ID_PCM_U24BE,
323 AV_CODEC_ID_PCM_S24DAUD,
324 AV_CODEC_ID_PCM_ZORK,
325 AV_CODEC_ID_PCM_S16LE_PLANAR,
326 AV_CODEC_ID_PCM_DVD,
327 AV_CODEC_ID_PCM_F32BE,
328 AV_CODEC_ID_PCM_F32LE,
329 AV_CODEC_ID_PCM_F64BE,
330 AV_CODEC_ID_PCM_F64LE,
331 AV_CODEC_ID_PCM_BLURAY,
332 AV_CODEC_ID_PCM_LXF,
333 AV_CODEC_ID_S302M,
334 AV_CODEC_ID_PCM_S8_PLANAR,
335 AV_CODEC_ID_PCM_S24LE_PLANAR,
336 AV_CODEC_ID_PCM_S32LE_PLANAR,
337 AV_CODEC_ID_PCM_S16BE_PLANAR,
338
339 /* various ADPCM codecs */
340 AV_CODEC_ID_ADPCM_IMA_QT = 0x11000,
341 AV_CODEC_ID_ADPCM_IMA_WAV,
342 AV_CODEC_ID_ADPCM_IMA_DK3,
343 AV_CODEC_ID_ADPCM_IMA_DK4,
344 AV_CODEC_ID_ADPCM_IMA_WS,
345 AV_CODEC_ID_ADPCM_IMA_SMJPEG,
346 AV_CODEC_ID_ADPCM_MS,
347 AV_CODEC_ID_ADPCM_4XM,
348 AV_CODEC_ID_ADPCM_XA,
349 AV_CODEC_ID_ADPCM_ADX,
350 AV_CODEC_ID_ADPCM_EA,
351 AV_CODEC_ID_ADPCM_G726,
352 AV_CODEC_ID_ADPCM_CT,
353 AV_CODEC_ID_ADPCM_SWF,
354 AV_CODEC_ID_ADPCM_YAMAHA,
355 AV_CODEC_ID_ADPCM_SBPRO_4,
356 AV_CODEC_ID_ADPCM_SBPRO_3,
357 AV_CODEC_ID_ADPCM_SBPRO_2,
358 AV_CODEC_ID_ADPCM_THP,
359 AV_CODEC_ID_ADPCM_IMA_AMV,
360 AV_CODEC_ID_ADPCM_EA_R1,
361 AV_CODEC_ID_ADPCM_EA_R3,
362 AV_CODEC_ID_ADPCM_EA_R2,
363 AV_CODEC_ID_ADPCM_IMA_EA_SEAD,
364 AV_CODEC_ID_ADPCM_IMA_EA_EACS,
365 AV_CODEC_ID_ADPCM_EA_XAS,
366 AV_CODEC_ID_ADPCM_EA_MAXIS_XA,
367 AV_CODEC_ID_ADPCM_IMA_ISS,
368 AV_CODEC_ID_ADPCM_G722,
369 AV_CODEC_ID_ADPCM_IMA_APC,
370 AV_CODEC_ID_ADPCM_VIMA,
371
372 /* AMR */
373 AV_CODEC_ID_AMR_NB = 0x12000,
374 AV_CODEC_ID_AMR_WB,
375
376 /* RealAudio codecs*/
377 AV_CODEC_ID_RA_144 = 0x13000,
378 AV_CODEC_ID_RA_288,
379
380 /* various DPCM codecs */
381 AV_CODEC_ID_ROQ_DPCM = 0x14000,
382 AV_CODEC_ID_INTERPLAY_DPCM,
383 AV_CODEC_ID_XAN_DPCM,
384 AV_CODEC_ID_SOL_DPCM,
385
386 /* audio codecs */
387 AV_CODEC_ID_MP2 = 0x15000,
388 AV_CODEC_ID_MP3, ///< preferred ID for decoding MPEG audio layer 1, 2 or 3
389 AV_CODEC_ID_AAC,
390 AV_CODEC_ID_AC3,
391 AV_CODEC_ID_DTS,
392 AV_CODEC_ID_VORBIS,
393 AV_CODEC_ID_DVAUDIO,
394 AV_CODEC_ID_WMAV1,
395 AV_CODEC_ID_WMAV2,
396 AV_CODEC_ID_MACE3,
397 AV_CODEC_ID_MACE6,
398 AV_CODEC_ID_VMDAUDIO,
399 AV_CODEC_ID_FLAC,
400 AV_CODEC_ID_MP3ADU,
401 AV_CODEC_ID_MP3ON4,
402 AV_CODEC_ID_SHORTEN,
403 AV_CODEC_ID_ALAC,
404 AV_CODEC_ID_WESTWOOD_SND1,
405 AV_CODEC_ID_GSM, ///< as in Berlin toast format
406 AV_CODEC_ID_QDM2,
407 AV_CODEC_ID_COOK,
408 AV_CODEC_ID_TRUESPEECH,
409 AV_CODEC_ID_TTA,
410 AV_CODEC_ID_SMACKAUDIO,
411 AV_CODEC_ID_QCELP,
412 AV_CODEC_ID_WAVPACK,
413 AV_CODEC_ID_DSICINAUDIO,
414 AV_CODEC_ID_IMC,
415 AV_CODEC_ID_MUSEPACK7,
416 AV_CODEC_ID_MLP,
417 AV_CODEC_ID_GSM_MS, /* as found in WAV */
418 AV_CODEC_ID_ATRAC3,
419 #if FF_API_VOXWARE
420 AV_CODEC_ID_VOXWARE,
421 #endif
422 AV_CODEC_ID_APE,
423 AV_CODEC_ID_NELLYMOSER,
424 AV_CODEC_ID_MUSEPACK8,
425 AV_CODEC_ID_SPEEX,
426 AV_CODEC_ID_WMAVOICE,
427 AV_CODEC_ID_WMAPRO,
428 AV_CODEC_ID_WMALOSSLESS,
429 AV_CODEC_ID_ATRAC3P,
430 AV_CODEC_ID_EAC3,
431 AV_CODEC_ID_SIPR,
432 AV_CODEC_ID_MP1,
433 AV_CODEC_ID_TWINVQ,
434 AV_CODEC_ID_TRUEHD,
435 AV_CODEC_ID_MP4ALS,
436 AV_CODEC_ID_ATRAC1,
437 AV_CODEC_ID_BINKAUDIO_RDFT,
438 AV_CODEC_ID_BINKAUDIO_DCT,
439 AV_CODEC_ID_AAC_LATM,
440 AV_CODEC_ID_QDMC,
441 AV_CODEC_ID_CELT,
442 AV_CODEC_ID_G723_1,
443 AV_CODEC_ID_G729,
444 AV_CODEC_ID_8SVX_EXP,
445 AV_CODEC_ID_8SVX_FIB,
446 AV_CODEC_ID_BMV_AUDIO,
447 AV_CODEC_ID_RALF,
448 AV_CODEC_ID_IAC,
449 AV_CODEC_ID_ILBC,
450 AV_CODEC_ID_OPUS,
451 AV_CODEC_ID_COMFORT_NOISE,
452 AV_CODEC_ID_TAK,
453 AV_CODEC_ID_METASOUND,
454 AV_CODEC_ID_PAF_AUDIO,
455 AV_CODEC_ID_ON2AVC,
456 AV_CODEC_ID_DSS_SP,
457
458 /* subtitle codecs */
459 AV_CODEC_ID_FIRST_SUBTITLE = 0x17000, ///< A dummy ID pointing at the start of subtitle codecs.
460 AV_CODEC_ID_DVD_SUBTITLE = 0x17000,
461 AV_CODEC_ID_DVB_SUBTITLE,
462 AV_CODEC_ID_TEXT, ///< raw UTF-8 text
463 AV_CODEC_ID_XSUB,
464 AV_CODEC_ID_SSA,
465 AV_CODEC_ID_MOV_TEXT,
466 AV_CODEC_ID_HDMV_PGS_SUBTITLE,
467 AV_CODEC_ID_DVB_TELETEXT,
468 AV_CODEC_ID_SRT,
469
470 /* other specific kind of codecs (generally used for attachments) */
471 AV_CODEC_ID_FIRST_UNKNOWN = 0x18000, ///< A dummy ID pointing at the start of various fake codecs.
472 AV_CODEC_ID_TTF = 0x18000,
473
474 AV_CODEC_ID_PROBE = 0x19000, ///< codec_id is not known (like AV_CODEC_ID_NONE) but lavf should attempt to identify it
475
476 AV_CODEC_ID_MPEG2TS = 0x20000, /**< _FAKE_ codec to indicate a raw MPEG-2 TS
477 * stream (only used by libavformat) */
478 AV_CODEC_ID_MPEG4SYSTEMS = 0x20001, /**< _FAKE_ codec to indicate a MPEG-4 Systems
479 * stream (only used by libavformat) */
480 AV_CODEC_ID_FFMETADATA = 0x21000, ///< Dummy codec for streams containing only metadata information.
481 AV_CODEC_ID_WRAPPED_AVFRAME = 0x21001, ///< Passthrough codec, AVFrames wrapped in AVPacket
482 };
483
484 /**
485 * This struct describes the properties of a single codec described by an
486 * AVCodecID.
487 * @see avcodec_descriptor_get()
488 */
489 typedef struct AVCodecDescriptor {
490 enum AVCodecID id;
491 enum AVMediaType type;
492 /**
493 * Name of the codec described by this descriptor. It is non-empty and
494 * unique for each codec descriptor. It should contain alphanumeric
495 * characters and '_' only.
496 */
497 const char *name;
498 /**
499 * A more descriptive name for this codec. May be NULL.
500 */
501 const char *long_name;
502 /**
503 * Codec properties, a combination of AV_CODEC_PROP_* flags.
504 */
505 int props;
506 /**
507 * If non-NULL, an array of profiles recognized for this codec.
508 * Terminated with FF_PROFILE_UNKNOWN.
509 */
510 const struct AVProfile *profiles;
511 } AVCodecDescriptor;
512
513 /**
514 * Codec uses only intra compression.
515 * Video codecs only.
516 */
517 #define AV_CODEC_PROP_INTRA_ONLY (1 << 0)
518 /**
519 * Codec supports lossy compression. Audio and video codecs only.
520 * @note a codec may support both lossy and lossless
521 * compression modes
522 */
523 #define AV_CODEC_PROP_LOSSY (1 << 1)
524 /**
525 * Codec supports lossless compression. Audio and video codecs only.
526 */
527 #define AV_CODEC_PROP_LOSSLESS (1 << 2)
528 /**
529 * Codec supports frame reordering. That is, the coded order (the order in which
530 * the encoded packets are output by the encoders / stored / input to the
531 * decoders) may be different from the presentation order of the corresponding
532 * frames.
533 *
534 * For codecs that do not have this property set, PTS and DTS should always be
535 * equal.
536 */
537 #define AV_CODEC_PROP_REORDER (1 << 3)
538
539 /**
540 * @ingroup lavc_decoding
541 * Required number of additionally allocated bytes at the end of the input bitstream for decoding.
542 * This is mainly needed because some optimized bitstream readers read
543 * 32 or 64 bit at once and could read over the end.<br>
544 * Note: If the first 23 bits of the additional bytes are not 0, then damaged
545 * MPEG bitstreams could cause overread and segfault.
546 */
547 #define AV_INPUT_BUFFER_PADDING_SIZE 8
548
549 /**
550 * @ingroup lavc_encoding
551 * minimum encoding buffer size
552 * Used to avoid some checks during header writing.
553 */
554 #define AV_INPUT_BUFFER_MIN_SIZE 16384
555
556 #if FF_API_WITHOUT_PREFIX
557 /**
558 * @deprecated use AV_INPUT_BUFFER_PADDING_SIZE instead
559 */
560 #define FF_INPUT_BUFFER_PADDING_SIZE 8
561
562 /**
563 * @deprecated use AV_INPUT_BUFFER_MIN_SIZE instead
564 */
565 #define FF_MIN_BUFFER_SIZE 16384
566 #endif /* FF_API_WITHOUT_PREFIX */
567
568 /**
569 * @ingroup lavc_encoding
570 * motion estimation type.
571 * @deprecated use codec private option instead
572 */
573 #if FF_API_MOTION_EST
574 enum Motion_Est_ID {
575 ME_ZERO = 1, ///< no search, that is use 0,0 vector whenever one is needed
576 ME_FULL,
577 ME_LOG,
578 ME_PHODS,
579 ME_EPZS, ///< enhanced predictive zonal search
580 ME_X1, ///< reserved for experiments
581 ME_HEX, ///< hexagon based search
582 ME_UMH, ///< uneven multi-hexagon search
583 ME_TESA, ///< transformed exhaustive search algorithm
584 };
585 #endif
586
587 /**
588 * @ingroup lavc_decoding
589 */
590 enum AVDiscard{
591 /* We leave some space between them for extensions (drop some
592 * keyframes for intra-only or drop just some bidir frames). */
593 AVDISCARD_NONE =-16, ///< discard nothing
594 AVDISCARD_DEFAULT = 0, ///< discard useless packets like 0 size packets in avi
595 AVDISCARD_NONREF = 8, ///< discard all non reference
596 AVDISCARD_BIDIR = 16, ///< discard all bidirectional frames
597 AVDISCARD_NONKEY = 32, ///< discard all frames except keyframes
598 AVDISCARD_ALL = 48, ///< discard all
599 };
600
601 enum AVAudioServiceType {
602 AV_AUDIO_SERVICE_TYPE_MAIN = 0,
603 AV_AUDIO_SERVICE_TYPE_EFFECTS = 1,
604 AV_AUDIO_SERVICE_TYPE_VISUALLY_IMPAIRED = 2,
605 AV_AUDIO_SERVICE_TYPE_HEARING_IMPAIRED = 3,
606 AV_AUDIO_SERVICE_TYPE_DIALOGUE = 4,
607 AV_AUDIO_SERVICE_TYPE_COMMENTARY = 5,
608 AV_AUDIO_SERVICE_TYPE_EMERGENCY = 6,
609 AV_AUDIO_SERVICE_TYPE_VOICE_OVER = 7,
610 AV_AUDIO_SERVICE_TYPE_KARAOKE = 8,
611 AV_AUDIO_SERVICE_TYPE_NB , ///< Not part of ABI
612 };
613
614 /**
615 * @ingroup lavc_encoding
616 */
617 typedef struct RcOverride{
618 int start_frame;
619 int end_frame;
620 int qscale; // If this is 0 then quality_factor will be used instead.
621 float quality_factor;
622 } RcOverride;
623
624 #if FF_API_MAX_BFRAMES
625 /**
626 * @deprecated there is no libavcodec-wide limit on the number of B-frames
627 */
628 #define FF_MAX_B_FRAMES 16
629 #endif
630
631 /* encoding support
632 These flags can be passed in AVCodecContext.flags before initialization.
633 Note: Not everything is supported yet.
634 */
635
636 /**
637 * Allow decoders to produce frames with data planes that are not aligned
638 * to CPU requirements (e.g. due to cropping).
639 */
640 #define AV_CODEC_FLAG_UNALIGNED (1 << 0)
641 /**
642 * Use fixed qscale.
643 */
644 #define AV_CODEC_FLAG_QSCALE (1 << 1)
645 /**
646 * 4 MV per MB allowed / advanced prediction for H.263.
647 */
648 #define AV_CODEC_FLAG_4MV (1 << 2)
649 /**
650 * Output even those frames that might be corrupted.
651 */
652 #define AV_CODEC_FLAG_OUTPUT_CORRUPT (1 << 3)
653 /**
654 * Use qpel MC.
655 */
656 #define AV_CODEC_FLAG_QPEL (1 << 4)
657 /**
658 * Use internal 2pass ratecontrol in first pass mode.
659 */
660 #define AV_CODEC_FLAG_PASS1 (1 << 9)
661 /**
662 * Use internal 2pass ratecontrol in second pass mode.
663 */
664 #define AV_CODEC_FLAG_PASS2 (1 << 10)
665 /**
666 * loop filter.
667 */
668 #define AV_CODEC_FLAG_LOOP_FILTER (1 << 11)
669 /**
670 * Only decode/encode grayscale.
671 */
672 #define AV_CODEC_FLAG_GRAY (1 << 13)
673 /**
674 * error[?] variables will be set during encoding.
675 */
676 #define AV_CODEC_FLAG_PSNR (1 << 15)
677 /**
678 * Input bitstream might be truncated at a random location
679 * instead of only at frame boundaries.
680 */
681 #define AV_CODEC_FLAG_TRUNCATED (1 << 16)
682 /**
683 * Use interlaced DCT.
684 */
685 #define AV_CODEC_FLAG_INTERLACED_DCT (1 << 18)
686 /**
687 * Force low delay.
688 */
689 #define AV_CODEC_FLAG_LOW_DELAY (1 << 19)
690 /**
691 * Place global headers in extradata instead of every keyframe.
692 */
693 #define AV_CODEC_FLAG_GLOBAL_HEADER (1 << 22)
694 /**
695 * Use only bitexact stuff (except (I)DCT).
696 */
697 #define AV_CODEC_FLAG_BITEXACT (1 << 23)
698 /* Fx : Flag for h263+ extra options */
699 /**
700 * H.263 advanced intra coding / MPEG-4 AC prediction
701 */
702 #define AV_CODEC_FLAG_AC_PRED (1 << 24)
703 /**
704 * interlaced motion estimation
705 */
706 #define AV_CODEC_FLAG_INTERLACED_ME (1 << 29)
707 #define AV_CODEC_FLAG_CLOSED_GOP (1 << 31)
708
709 /**
710 * Allow non spec compliant speedup tricks.
711 */
712 #define AV_CODEC_FLAG2_FAST (1 << 0)
713 /**
714 * Skip bitstream encoding.
715 */
716 #define AV_CODEC_FLAG2_NO_OUTPUT (1 << 2)
717 /**
718 * Place global headers at every keyframe instead of in extradata.
719 */
720 #define AV_CODEC_FLAG2_LOCAL_HEADER (1 << 3)
721 /**
722 * Input bitstream might be truncated at a packet boundaries
723 * instead of only at frame boundaries.
724 */
725 #define AV_CODEC_FLAG2_CHUNKS (1 << 15)
726 /**
727 * Discard cropping information from SPS.
728 */
729 #define AV_CODEC_FLAG2_IGNORE_CROP (1 << 16)
730
731 /* Unsupported options :
732 * Syntax Arithmetic coding (SAC)
733 * Reference Picture Selection
734 * Independent Segment Decoding */
735 /* /Fx */
736 /* codec capabilities */
737
738 /**
739 * Decoder can use draw_horiz_band callback.
740 */
741 #define AV_CODEC_CAP_DRAW_HORIZ_BAND (1 << 0)
742 /**
743 * Codec uses get_buffer() for allocating buffers and supports custom allocators.
744 * If not set, it might not use get_buffer() at all or use operations that
745 * assume the buffer was allocated by avcodec_default_get_buffer.
746 */
747 #define AV_CODEC_CAP_DR1 (1 << 1)
748 #define AV_CODEC_CAP_TRUNCATED (1 << 3)
749 /**
750 * Encoder or decoder requires flushing with NULL input at the end in order to
751 * give the complete and correct output.
752 *
753 * NOTE: If this flag is not set, the codec is guaranteed to never be fed with
754 * with NULL data. The user can still send NULL data to the public encode
755 * or decode function, but libavcodec will not pass it along to the codec
756 * unless this flag is set.
757 *
758 * Decoders:
759 * The decoder has a non-zero delay and needs to be fed with avpkt->data=NULL,
760 * avpkt->size=0 at the end to get the delayed data until the decoder no longer
761 * returns frames.
762 *
763 * Encoders:
764 * The encoder needs to be fed with NULL data at the end of encoding until the
765 * encoder no longer returns data.
766 *
767 * NOTE: For encoders implementing the AVCodec.encode2() function, setting this
768 * flag also means that the encoder must set the pts and duration for
769 * each output packet. If this flag is not set, the pts and duration will
770 * be determined by libavcodec from the input frame.
771 */
772 #define AV_CODEC_CAP_DELAY (1 << 5)
773 /**
774 * Codec can be fed a final frame with a smaller size.
775 * This can be used to prevent truncation of the last audio samples.
776 */
777 #define AV_CODEC_CAP_SMALL_LAST_FRAME (1 << 6)
778 /**
779 * Codec can output multiple frames per AVPacket
780 * Normally demuxers return one frame at a time, demuxers which do not do
781 * are connected to a parser to split what they return into proper frames.
782 * This flag is reserved to the very rare category of codecs which have a
783 * bitstream that cannot be split into frames without timeconsuming
784 * operations like full decoding. Demuxers carring such bitstreams thus
785 * may return multiple frames in a packet. This has many disadvantages like
786 * prohibiting stream copy in many cases thus it should only be considered
787 * as a last resort.
788 */
789 #define AV_CODEC_CAP_SUBFRAMES (1 << 8)
790 /**
791 * Codec is experimental and is thus avoided in favor of non experimental
792 * encoders
793 */
794 #define AV_CODEC_CAP_EXPERIMENTAL (1 << 9)
795 /**
796 * Codec should fill in channel configuration and samplerate instead of container
797 */
798 #define AV_CODEC_CAP_CHANNEL_CONF (1 << 10)
799 /**
800 * Codec supports frame-level multithreading.
801 */
802 #define AV_CODEC_CAP_FRAME_THREADS (1 << 12)
803 /**
804 * Codec supports slice-based (or partition-based) multithreading.
805 */
806 #define AV_CODEC_CAP_SLICE_THREADS (1 << 13)
807 /**
808 * Codec supports changed parameters at any point.
809 */
810 #define AV_CODEC_CAP_PARAM_CHANGE (1 << 14)
811 /**
812 * Codec supports avctx->thread_count == 0 (auto).
813 */
814 #define AV_CODEC_CAP_AUTO_THREADS (1 << 15)
815 /**
816 * Audio encoder supports receiving a different number of samples in each call.
817 */
818 #define AV_CODEC_CAP_VARIABLE_FRAME_SIZE (1 << 16)
819
820 #if FF_API_WITHOUT_PREFIX
821 /**
822 * Allow decoders to produce frames with data planes that are not aligned
823 * to CPU requirements (e.g. due to cropping).
824 */
825 #define CODEC_FLAG_UNALIGNED 0x0001
826 #define CODEC_FLAG_QSCALE 0x0002 ///< Use fixed qscale.
827 #define CODEC_FLAG_4MV 0x0004 ///< 4 MV per MB allowed / advanced prediction for H.263.
828 #define CODEC_FLAG_OUTPUT_CORRUPT 0x0008 ///< Output even those frames that might be corrupted
829 #define CODEC_FLAG_QPEL 0x0010 ///< Use qpel MC.
830 #if FF_API_GMC
831 /**
832 * @deprecated use the "gmc" private option of the libxvid encoder
833 */
834 #define CODEC_FLAG_GMC 0x0020 ///< Use GMC.
835 #endif
836 #if FF_API_MV0
837 /**
838 * @deprecated use the flag "mv0" in the "mpv_flags" private option of the
839 * mpegvideo encoders
840 */
841 #define CODEC_FLAG_MV0 0x0040
842 #endif
843 #if FF_API_INPUT_PRESERVED
844 /**
845 * @deprecated passing reference-counted frames to the encoders replaces this
846 * flag
847 */
848 #define CODEC_FLAG_INPUT_PRESERVED 0x0100
849 #endif
850 #define CODEC_FLAG_PASS1 0x0200 ///< Use internal 2pass ratecontrol in first pass mode.
851 #define CODEC_FLAG_PASS2 0x0400 ///< Use internal 2pass ratecontrol in second pass mode.
852 #define CODEC_FLAG_GRAY 0x2000 ///< Only decode/encode grayscale.
853 #if FF_API_EMU_EDGE
854 /**
855 * @deprecated edges are not used/required anymore. I.e. this flag is now always
856 * set.
857 */
858 #define CODEC_FLAG_EMU_EDGE 0x4000
859 #endif
860 #define CODEC_FLAG_PSNR 0x8000 ///< error[?] variables will be set during encoding.
861 #define CODEC_FLAG_TRUNCATED 0x00010000 /** Input bitstream might be truncated at a random
862 location instead of only at frame boundaries. */
863 #if FF_API_NORMALIZE_AQP
864 /**
865 * @deprecated use the flag "naq" in the "mpv_flags" private option of the
866 * mpegvideo encoders
867 */
868 #define CODEC_FLAG_NORMALIZE_AQP 0x00020000
869 #endif
870 #define CODEC_FLAG_INTERLACED_DCT 0x00040000 ///< Use interlaced DCT.
871 #define CODEC_FLAG_LOW_DELAY 0x00080000 ///< Force low delay.
872 #define CODEC_FLAG_GLOBAL_HEADER 0x00400000 ///< Place global headers in extradata instead of every keyframe.
873 #define CODEC_FLAG_BITEXACT 0x00800000 ///< Use only bitexact stuff (except (I)DCT).
874 /* Fx : Flag for h263+ extra options */
875 #define CODEC_FLAG_AC_PRED 0x01000000 ///< H.263 advanced intra coding / MPEG-4 AC prediction
876 #define CODEC_FLAG_LOOP_FILTER 0x00000800 ///< loop filter
877 #define CODEC_FLAG_INTERLACED_ME 0x20000000 ///< interlaced motion estimation
878 #define CODEC_FLAG_CLOSED_GOP 0x80000000
879 #define CODEC_FLAG2_FAST 0x00000001 ///< Allow non spec compliant speedup tricks.
880 #define CODEC_FLAG2_NO_OUTPUT 0x00000004 ///< Skip bitstream encoding.
881 #define CODEC_FLAG2_LOCAL_HEADER 0x00000008 ///< Place global headers at every keyframe instead of in extradata.
882 #define CODEC_FLAG2_IGNORE_CROP 0x00010000 ///< Discard cropping information from SPS.
883
884 #define CODEC_FLAG2_CHUNKS 0x00008000 ///< Input bitstream might be truncated at a packet boundaries instead of only at frame boundaries.
885
886 /* Unsupported options :
887 * Syntax Arithmetic coding (SAC)
888 * Reference Picture Selection
889 * Independent Segment Decoding */
890 /* /Fx */
891 /* codec capabilities */
892
893 #define CODEC_CAP_DRAW_HORIZ_BAND 0x0001 ///< Decoder can use draw_horiz_band callback.
894 /**
895 * Codec uses get_buffer() for allocating buffers and supports custom allocators.
896 * If not set, it might not use get_buffer() at all or use operations that
897 * assume the buffer was allocated by avcodec_default_get_buffer.
898 */
899 #define CODEC_CAP_DR1 0x0002
900 #define CODEC_CAP_TRUNCATED 0x0008
901 #if FF_API_XVMC
902 /* Codec can export data for HW decoding (XvMC). */
903 #define CODEC_CAP_HWACCEL 0x0010
904 #endif /* FF_API_XVMC */
905 /**
906 * Encoder or decoder requires flushing with NULL input at the end in order to
907 * give the complete and correct output.
908 *
909 * NOTE: If this flag is not set, the codec is guaranteed to never be fed with
910 * with NULL data. The user can still send NULL data to the public encode
911 * or decode function, but libavcodec will not pass it along to the codec
912 * unless this flag is set.
913 *
914 * Decoders:
915 * The decoder has a non-zero delay and needs to be fed with avpkt->data=NULL,
916 * avpkt->size=0 at the end to get the delayed data until the decoder no longer
917 * returns frames.
918 *
919 * Encoders:
920 * The encoder needs to be fed with NULL data at the end of encoding until the
921 * encoder no longer returns data.
922 *
923 * NOTE: For encoders implementing the AVCodec.encode2() function, setting this
924 * flag also means that the encoder must set the pts and duration for
925 * each output packet. If this flag is not set, the pts and duration will
926 * be determined by libavcodec from the input frame.
927 */
928 #define CODEC_CAP_DELAY 0x0020
929 /**
930 * Codec can be fed a final frame with a smaller size.
931 * This can be used to prevent truncation of the last audio samples.
932 */
933 #define CODEC_CAP_SMALL_LAST_FRAME 0x0040
934 #if FF_API_CAP_VDPAU
935 /**
936 * Codec can export data for HW decoding (VDPAU).
937 */
938 #define CODEC_CAP_HWACCEL_VDPAU 0x0080
939 #endif
940 /**
941 * Codec can output multiple frames per AVPacket
942 * Normally demuxers return one frame at a time, demuxers which do not do
943 * are connected to a parser to split what they return into proper frames.
944 * This flag is reserved to the very rare category of codecs which have a
945 * bitstream that cannot be split into frames without timeconsuming
946 * operations like full decoding. Demuxers carring such bitstreams thus
947 * may return multiple frames in a packet. This has many disadvantages like
948 * prohibiting stream copy in many cases thus it should only be considered
949 * as a last resort.
950 */
951 #define CODEC_CAP_SUBFRAMES 0x0100
952 /**
953 * Codec is experimental and is thus avoided in favor of non experimental
954 * encoders
955 */
956 #define CODEC_CAP_EXPERIMENTAL 0x0200
957 /**
958 * Codec should fill in channel configuration and samplerate instead of container
959 */
960 #define CODEC_CAP_CHANNEL_CONF 0x0400
961 #if FF_API_NEG_LINESIZES
962 /**
963 * @deprecated no codecs use this capability
964 */
965 #define CODEC_CAP_NEG_LINESIZES 0x0800
966 #endif
967 /**
968 * Codec supports frame-level multithreading.
969 */
970 #define CODEC_CAP_FRAME_THREADS 0x1000
971 /**
972 * Codec supports slice-based (or partition-based) multithreading.
973 */
974 #define CODEC_CAP_SLICE_THREADS 0x2000
975 /**
976 * Codec supports changed parameters at any point.
977 */
978 #define CODEC_CAP_PARAM_CHANGE 0x4000
979 /**
980 * Codec supports avctx->thread_count == 0 (auto).
981 */
982 #define CODEC_CAP_AUTO_THREADS 0x8000
983 /**
984 * Audio encoder supports receiving a different number of samples in each call.
985 */
986 #define CODEC_CAP_VARIABLE_FRAME_SIZE 0x10000
987 #endif /* FF_API_WITHOUT_PREFIX */
988
989 #if FF_API_MB_TYPE
990 //The following defines may change, don't expect compatibility if you use them.
991 #define MB_TYPE_INTRA4x4 0x0001
992 #define MB_TYPE_INTRA16x16 0x0002 //FIXME H.264-specific
993 #define MB_TYPE_INTRA_PCM 0x0004 //FIXME H.264-specific
994 #define MB_TYPE_16x16 0x0008
995 #define MB_TYPE_16x8 0x0010
996 #define MB_TYPE_8x16 0x0020
997 #define MB_TYPE_8x8 0x0040
998 #define MB_TYPE_INTERLACED 0x0080
999 #define MB_TYPE_DIRECT2 0x0100 //FIXME
1000 #define MB_TYPE_ACPRED 0x0200
1001 #define MB_TYPE_GMC 0x0400
1002 #define MB_TYPE_SKIP 0x0800
1003 #define MB_TYPE_P0L0 0x1000
1004 #define MB_TYPE_P1L0 0x2000
1005 #define MB_TYPE_P0L1 0x4000
1006 #define MB_TYPE_P1L1 0x8000
1007 #define MB_TYPE_L0 (MB_TYPE_P0L0 | MB_TYPE_P1L0)
1008 #define MB_TYPE_L1 (MB_TYPE_P0L1 | MB_TYPE_P1L1)
1009 #define MB_TYPE_L0L1 (MB_TYPE_L0 | MB_TYPE_L1)
1010 #define MB_TYPE_QUANT 0x00010000
1011 #define MB_TYPE_CBP 0x00020000
1012 //Note bits 24-31 are reserved for codec specific use (h264 ref0, mpeg1 0mv, ...)
1013 #endif
1014
1015 /**
1016 * Pan Scan area.
1017 * This specifies the area which should be displayed.
1018 * Note there may be multiple such areas for one frame.
1019 */
1020 typedef struct AVPanScan{
1021 /**
1022 * id
1023 * - encoding: Set by user.
1024 * - decoding: Set by libavcodec.
1025 */
1026 int id;
1027
1028 /**
1029 * width and height in 1/16 pel
1030 * - encoding: Set by user.
1031 * - decoding: Set by libavcodec.
1032 */
1033 int width;
1034 int height;
1035
1036 /**
1037 * position of the top left corner in 1/16 pel for up to 3 fields/frames
1038 * - encoding: Set by user.
1039 * - decoding: Set by libavcodec.
1040 */
1041 int16_t position[3][2];
1042 }AVPanScan;
1043
1044 /**
1045 * This structure describes the bitrate properties of an encoded bitstream. It
1046 * roughly corresponds to a subset the VBV parameters for MPEG-2 or HRD
1047 * parameters for H.264/HEVC.
1048 */
1049 typedef struct AVCPBProperties {
1050 /**
1051 * Maximum bitrate of the stream, in bits per second.
1052 * Zero if unknown or unspecified.
1053 */
1054 int max_bitrate;
1055 /**
1056 * Minimum bitrate of the stream, in bits per second.
1057 * Zero if unknown or unspecified.
1058 */
1059 int min_bitrate;
1060 /**
1061 * Average bitrate of the stream, in bits per second.
1062 * Zero if unknown or unspecified.
1063 */
1064 int avg_bitrate;
1065
1066 /**
1067 * The size of the buffer to which the ratecontrol is applied, in bits.
1068 * Zero if unknown or unspecified.
1069 */
1070 int buffer_size;
1071
1072 /**
1073 * The delay between the time the packet this structure is associated with
1074 * is received and the time when it should be decoded, in periods of a 27MHz
1075 * clock.
1076 *
1077 * UINT64_MAX when unknown or unspecified.
1078 */
1079 uint64_t vbv_delay;
1080 } AVCPBProperties;
1081
1082 #if FF_API_QSCALE_TYPE
1083 #define FF_QSCALE_TYPE_MPEG1 0
1084 #define FF_QSCALE_TYPE_MPEG2 1
1085 #define FF_QSCALE_TYPE_H264 2
1086 #define FF_QSCALE_TYPE_VP56 3
1087 #endif
1088
1089 /**
1090 * The decoder will keep a reference to the frame and may reuse it later.
1091 */
1092 #define AV_GET_BUFFER_FLAG_REF (1 << 0)
1093
1094 /**
1095 * @defgroup lavc_packet AVPacket
1096 *
1097 * Types and functions for working with AVPacket.
1098 * @{
1099 */
1100 enum AVPacketSideDataType {
1101 AV_PKT_DATA_PALETTE,
1102 AV_PKT_DATA_NEW_EXTRADATA,
1103
1104 /**
1105 * An AV_PKT_DATA_PARAM_CHANGE side data packet is laid out as follows:
1106 * @code
1107 * u32le param_flags
1108 * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_COUNT)
1109 * s32le channel_count
1110 * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_LAYOUT)
1111 * u64le channel_layout
1112 * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_SAMPLE_RATE)
1113 * s32le sample_rate
1114 * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_DIMENSIONS)
1115 * s32le width
1116 * s32le height
1117 * @endcode
1118 */
1119 AV_PKT_DATA_PARAM_CHANGE,
1120
1121 /**
1122 * An AV_PKT_DATA_H263_MB_INFO side data packet contains a number of
1123 * structures with info about macroblocks relevant to splitting the
1124 * packet into smaller packets on macroblock edges (e.g. as for RFC 2190).
1125 * That is, it does not necessarily contain info about all macroblocks,
1126 * as long as the distance between macroblocks in the info is smaller
1127 * than the target payload size.
1128 * Each MB info structure is 12 bytes, and is laid out as follows:
1129 * @code
1130 * u32le bit offset from the start of the packet
1131 * u8 current quantizer at the start of the macroblock
1132 * u8 GOB number
1133 * u16le macroblock address within the GOB
1134 * u8 horizontal MV predictor
1135 * u8 vertical MV predictor
1136 * u8 horizontal MV predictor for block number 3
1137 * u8 vertical MV predictor for block number 3
1138 * @endcode
1139 */
1140 AV_PKT_DATA_H263_MB_INFO,
1141
1142 /**
1143 * This side data should be associated with an audio stream and contains
1144 * ReplayGain information in form of the AVReplayGain struct.
1145 */
1146 AV_PKT_DATA_REPLAYGAIN,
1147
1148 /**
1149 * This side data contains a 3x3 transformation matrix describing an affine
1150 * transformation that needs to be applied to the decoded video frames for
1151 * correct presentation.
1152 *
1153 * See libavutil/display.h for a detailed description of the data.
1154 */
1155 AV_PKT_DATA_DISPLAYMATRIX,
1156
1157 /**
1158 * This side data should be associated with a video stream and contains
1159 * Stereoscopic 3D information in form of the AVStereo3D struct.
1160 */
1161 AV_PKT_DATA_STEREO3D,
1162
1163 /**
1164 * This side data should be associated with an audio stream and corresponds
1165 * to enum AVAudioServiceType.
1166 */
1167 AV_PKT_DATA_AUDIO_SERVICE_TYPE,
1168
1169 /**
1170 * This side data contains an integer value representing the quality
1171 * factor of the compressed frame. Allowed range is between 1 (good)
1172 * and FF_LAMBDA_MAX (bad).
1173 */
1174 AV_PKT_DATA_QUALITY_FACTOR,
1175
1176 /**
1177 * This side data contains an integer value representing the stream index
1178 * of a "fallback" track. A fallback track indicates an alternate
1179 * track to use when the current track can not be decoded for some reason.
1180 * e.g. no decoder available for codec.
1181 */
1182 AV_PKT_DATA_FALLBACK_TRACK,
1183
1184 /**
1185 * This side data corresponds to the AVCPBProperties struct.
1186 */
1187 AV_PKT_DATA_CPB_PROPERTIES,
1188 };
1189
1190 typedef struct AVPacketSideData {
1191 uint8_t *data;
1192 int size;
1193 enum AVPacketSideDataType type;
1194 } AVPacketSideData;
1195
1196 /**
1197 * This structure stores compressed data. It is typically exported by demuxers
1198 * and then passed as input to decoders, or received as output from encoders and
1199 * then passed to muxers.
1200 *
1201 * For video, it should typically contain one compressed frame. For audio it may
1202 * contain several compressed frames. Encoders are allowed to output empty
1203 * packets, with no compressed data, containing only side data
1204 * (e.g. to update some stream parameters at the end of encoding).
1205 *
1206 * AVPacket is one of the few structs in Libav, whose size is a part of public
1207 * ABI. Thus it may be allocated on stack and no new fields can be added to it
1208 * without libavcodec and libavformat major bump.
1209 *
1210 * The semantics of data ownership depends on the buf field.
1211 * If it is set, the packet data is dynamically allocated and is
1212 * valid indefinitely until a call to av_packet_unref() reduces the
1213 * reference count to 0.
1214 *
1215 * If the buf field is not set av_packet_ref() would make a copy instead
1216 * of increasing the reference count.
1217 *
1218 * The side data is always allocated with av_malloc(), copied by
1219 * av_packet_ref() and freed by av_packet_unref().
1220 *
1221 * @see av_packet_ref
1222 * @see av_packet_unref
1223 */
1224 typedef struct AVPacket {
1225 /**
1226 * A reference to the reference-counted buffer where the packet data is
1227 * stored.
1228 * May be NULL, then the packet data is not reference-counted.
1229 */
1230 AVBufferRef *buf;
1231 /**
1232 * Presentation timestamp in AVStream->time_base units; the time at which
1233 * the decompressed packet will be presented to the user.
1234 * Can be AV_NOPTS_VALUE if it is not stored in the file.
1235 * pts MUST be larger or equal to dts as presentation cannot happen before
1236 * decompression, unless one wants to view hex dumps. Some formats misuse
1237 * the terms dts and pts/cts to mean something different. Such timestamps
1238 * must be converted to true pts/dts before they are stored in AVPacket.
1239 */
1240 int64_t pts;
1241 /**
1242 * Decompression timestamp in AVStream->time_base units; the time at which
1243 * the packet is decompressed.
1244 * Can be AV_NOPTS_VALUE if it is not stored in the file.
1245 */
1246 int64_t dts;
1247 uint8_t *data;
1248 int size;
1249 int stream_index;
1250 /**
1251 * A combination of AV_PKT_FLAG values
1252 */
1253 int flags;
1254 /**
1255 * Additional packet data that can be provided by the container.
1256 * Packet can contain several types of side information.
1257 */
1258 AVPacketSideData *side_data;
1259 int side_data_elems;
1260
1261 /**
1262 * Duration of this packet in AVStream->time_base units, 0 if unknown.
1263 * Equals next_pts - this_pts in presentation order.
1264 */
1265 int64_t duration;
1266
1267 int64_t pos; ///< byte position in stream, -1 if unknown
1268
1269 #if FF_API_CONVERGENCE_DURATION
1270 /**
1271 * @deprecated Same as the duration field, but as int64_t. This was required
1272 * for Matroska subtitles, whose duration values could overflow when the
1273 * duration field was still an int.
1274 */
1275 attribute_deprecated
1276 int64_t convergence_duration;
1277 #endif
1278 } AVPacket;
1279 #define AV_PKT_FLAG_KEY 0x0001 ///< The packet contains a keyframe
1280 #define AV_PKT_FLAG_CORRUPT 0x0002 ///< The packet content is corrupted
1281
1282 enum AVSideDataParamChangeFlags {
1283 AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_COUNT = 0x0001,
1284 AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_LAYOUT = 0x0002,
1285 AV_SIDE_DATA_PARAM_CHANGE_SAMPLE_RATE = 0x0004,
1286 AV_SIDE_DATA_PARAM_CHANGE_DIMENSIONS = 0x0008,
1287 };
1288 /**
1289 * @}
1290 */
1291
1292 struct AVCodecInternal;
1293
1294 enum AVFieldOrder {
1295 AV_FIELD_UNKNOWN,
1296 AV_FIELD_PROGRESSIVE,
1297 AV_FIELD_TT, //< Top coded_first, top displayed first
1298 AV_FIELD_BB, //< Bottom coded first, bottom displayed first
1299 AV_FIELD_TB, //< Top coded first, bottom displayed first
1300 AV_FIELD_BT, //< Bottom coded first, top displayed first
1301 };
1302
1303 /**
1304 * main external API structure.
1305 * New fields can be added to the end with minor version bumps.
1306 * Removal, reordering and changes to existing fields require a major
1307 * version bump.
1308 * sizeof(AVCodecContext) must not be used outside libav*.
1309 */
1310 typedef struct AVCodecContext {
1311 /**
1312 * information on struct for av_log
1313 * - set by avcodec_alloc_context3
1314 */
1315 const AVClass *av_class;
1316 int log_level_offset;
1317
1318 enum AVMediaType codec_type; /* see AVMEDIA_TYPE_xxx */
1319 const struct AVCodec *codec;
1320 #if FF_API_CODEC_NAME
1321 /**
1322 * @deprecated this field is not used for anything in libavcodec
1323 */
1324 attribute_deprecated
1325 char codec_name[32];
1326 #endif
1327 enum AVCodecID codec_id; /* see AV_CODEC_ID_xxx */
1328
1329 /**
1330 * fourcc (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A').
1331 * This is used to work around some encoder bugs.
1332 * A demuxer should set this to what is stored in the field used to identify the codec.
1333 * If there are multiple such fields in a container then the demuxer should choose the one
1334 * which maximizes the information about the used codec.
1335 * If the codec tag field in a container is larger than 32 bits then the demuxer should
1336 * remap the longer ID to 32 bits with a table or other structure. Alternatively a new
1337 * extra_codec_tag + size could be added but for this a clear advantage must be demonstrated
1338 * first.
1339 * - encoding: Set by user, if not then the default based on codec_id will be used.
1340 * - decoding: Set by user, will be converted to uppercase by libavcodec during init.
1341 */
1342 unsigned int codec_tag;
1343
1344 #if FF_API_STREAM_CODEC_TAG
1345 /**
1346 * @deprecated this field is unused
1347 */
1348 attribute_deprecated
1349 unsigned int stream_codec_tag;
1350 #endif
1351
1352 void *priv_data;
1353
1354 /**
1355 * Private context used for internal data.
1356 *
1357 * Unlike priv_data, this is not codec-specific. It is used in general
1358 * libavcodec functions.
1359 */
1360 struct AVCodecInternal *internal;
1361
1362 /**
1363 * Private data of the user, can be used to carry app specific stuff.
1364 * - encoding: Set by user.
1365 * - decoding: Set by user.
1366 */
1367 void *opaque;
1368
1369 /**
1370 * the average bitrate
1371 * - encoding: Set by user; unused for constant quantizer encoding.
1372 * - decoding: Set by libavcodec. 0 or some bitrate if this info is available in the stream.
1373 */
1374 int bit_rate;
1375
1376 /**
1377 * number of bits the bitstream is allowed to diverge from the reference.
1378 * the reference can be CBR (for CBR pass1) or VBR (for pass2)
1379 * - encoding: Set by user; unused for constant quantizer encoding.
1380 * - decoding: unused
1381 */
1382 int bit_rate_tolerance;
1383
1384 /**
1385 * Global quality for codecs which cannot change it per frame.
1386 * This should be proportional to MPEG-1/2/4 qscale.
1387 * - encoding: Set by user.
1388 * - decoding: unused
1389 */
1390 int global_quality;
1391
1392 /**
1393 * - encoding: Set by user.
1394 * - decoding: unused
1395 */
1396 int compression_level;
1397 #define FF_COMPRESSION_DEFAULT -1
1398
1399 /**
1400 * AV_CODEC_FLAG_*.
1401 * - encoding: Set by user.
1402 * - decoding: Set by user.
1403 */
1404 int flags;
1405
1406 /**
1407 * AV_CODEC_FLAG2_*
1408 * - encoding: Set by user.
1409 * - decoding: Set by user.
1410 */
1411 int flags2;
1412
1413 /**
1414 * some codecs need / can use extradata like Huffman tables.
1415 * mjpeg: Huffman tables
1416 * rv10: additional flags
1417 * mpeg4: global headers (they can be in the bitstream or here)
1418 * The allocated memory should be AV_INPUT_BUFFER_PADDING_SIZE bytes larger
1419 * than extradata_size to avoid prolems if it is read with the bitstream reader.
1420 * The bytewise contents of extradata must not depend on the architecture or CPU endianness.
1421 * - encoding: Set/allocated/freed by libavcodec.
1422 * - decoding: Set/allocated/freed by user.
1423 */
1424 uint8_t *extradata;
1425 int extradata_size;
1426
1427 /**
1428 * This is the fundamental unit of time (in seconds) in terms
1429 * of which frame timestamps are represented. For fixed-fps content,
1430 * timebase should be 1/framerate and timestamp increments should be
1431 * identically 1.
1432 * - encoding: MUST be set by user.
1433 * - decoding: the use of this field for decoding is deprecated.
1434 * Use framerate instead.
1435 */
1436 AVRational time_base;
1437
1438 /**
1439 * For some codecs, the time base is closer to the field rate than the frame rate.
1440 * Most notably, H.264 and MPEG-2 specify time_base as half of frame duration
1441 * if no telecine is used ...
1442 *
1443 * Set to time_base ticks per frame. Default 1, e.g., H.264/MPEG-2 set it to 2.
1444 */
1445 int ticks_per_frame;
1446
1447 /**
1448 * Codec delay.
1449 *
1450 * Video:
1451 * Number of frames the decoded output will be delayed relative to the
1452 * encoded input.
1453 *
1454 * Audio:
1455 * For encoding, this field is unused (see initial_padding).
1456 *
1457 * For decoding, this is the number of samples the decoder needs to
1458 * output before the decoder's output is valid. When seeking, you should
1459 * start decoding this many samples prior to your desired seek point.
1460 *
1461 * - encoding: Set by libavcodec.
1462 * - decoding: Set by libavcodec.
1463 */
1464 int delay;
1465
1466
1467 /* video only */
1468 /**
1469 * picture width / height.
1470 *
1471 * @note Those fields may not match the values of the last
1472 * AVFrame outputted by avcodec_decode_video2 due frame
1473 * reordering.
1474 *
1475 * - encoding: MUST be set by user.
1476 * - decoding: May be set by the user before opening the decoder if known e.g.
1477 * from the container. Some decoders will require the dimensions
1478 * to be set by the caller. During decoding, the decoder may
1479 * overwrite those values as required while parsing the data.
1480 */
1481 int width, height;
1482
1483 /**
1484 * Bitstream width / height, may be different from width/height e.g. when
1485 * the decoded frame is cropped before being output.
1486 *
1487 * @note Those field may not match the value of the last
1488 * AVFrame outputted by avcodec_decode_video2 due frame
1489 * reordering.
1490 *
1491 * - encoding: unused
1492 * - decoding: May be set by the user before opening the decoder if known
1493 * e.g. from the container. During decoding, the decoder may
1494 * overwrite those values as required while parsing the data.
1495 */
1496 int coded_width, coded_height;
1497
1498 #if FF_API_ASPECT_EXTENDED
1499 #define FF_ASPECT_EXTENDED 15
1500 #endif
1501
1502 /**
1503 * the number of pictures in a group of pictures, or 0 for intra_only
1504 * - encoding: Set by user.
1505 * - decoding: unused
1506 */
1507 int gop_size;
1508
1509 /**
1510 * Pixel format, see AV_PIX_FMT_xxx.
1511 * May be set by the demuxer if known from headers.
1512 * May be overriden by the decoder if it knows better.
1513 *
1514 * @note This field may not match the value of the last
1515 * AVFrame outputted by avcodec_decode_video2 due frame
1516 * reordering.
1517 *
1518 * - encoding: Set by user.
1519 * - decoding: Set by user if known, overridden by libavcodec while
1520 * parsing the data.
1521 */
1522 enum AVPixelFormat pix_fmt;
1523
1524 #if FF_API_MOTION_EST
1525 /**
1526 * This option does nothing
1527 * @deprecated use codec private options instead
1528 */
1529 attribute_deprecated int me_method;
1530 #endif
1531
1532 /**
1533 * If non NULL, 'draw_horiz_band' is called by the libavcodec
1534 * decoder to draw a horizontal band. It improves cache usage. Not
1535 * all codecs can do that. You must check the codec capabilities
1536 * beforehand.
1537 * When multithreading is used, it may be called from multiple threads
1538 * at the same time; threads might draw different parts of the same AVFrame,
1539 * or multiple AVFrames, and there is no guarantee that slices will be drawn
1540 * in order.
1541 * The function is also used by hardware acceleration APIs.
1542 * It is called at least once during frame decoding to pass
1543 * the data needed for hardware render.
1544 * In that mode instead of pixel data, AVFrame points to
1545 * a structure specific to the acceleration API. The application
1546 * reads the structure and can change some fields to indicate progress
1547 * or mark state.
1548 * - encoding: unused
1549 * - decoding: Set by user.
1550 * @param height the height of the slice
1551 * @param y the y position of the slice
1552 * @param type 1->top field, 2->bottom field, 3->frame
1553 * @param offset offset into the AVFrame.data from which the slice should be read
1554 */
1555 void (*draw_horiz_band)(struct AVCodecContext *s,
1556 const AVFrame *src, int offset[AV_NUM_DATA_POINTERS],
1557 int y, int type, int height);
1558
1559 /**
1560 * callback to negotiate the pixelFormat
1561 * @param fmt is the list of formats which are supported by the codec,
1562 * it is terminated by -1 as 0 is a valid format, the formats are ordered by quality.
1563 * The first is always the native one.
1564 * @note The callback may be called again immediately if initialization for
1565 * the selected (hardware-accelerated) pixel format failed.
1566 * @warning Behavior is undefined if the callback returns a value not
1567 * in the fmt list of formats.
1568 * @return the chosen format
1569 * - encoding: unused
1570 * - decoding: Set by user, if not set the native format will be chosen.
1571 */
1572 enum AVPixelFormat (*get_format)(struct AVCodecContext *s, const enum AVPixelFormat * fmt);
1573
1574 /**
1575 * maximum number of B-frames between non-B-frames
1576 * Note: The output will be delayed by max_b_frames+1 relative to the input.
1577 * - encoding: Set by user.
1578 * - decoding: unused
1579 */
1580 int max_b_frames;
1581
1582 /**
1583 * qscale factor between IP and B-frames
1584 * If > 0 then the last P-frame quantizer will be used (q= lastp_q*factor+offset).
1585 * If < 0 then normal ratecontrol will be done (q= -normal_q*factor+offset).
1586 * - encoding: Set by user.
1587 * - decoding: unused
1588 */
1589 float b_quant_factor;
1590
1591 #if FF_API_RC_STRATEGY
1592 /** @deprecated use codec private option instead */
1593 attribute_deprecated int rc_strategy;
1594 #define FF_RC_STRATEGY_XVID 1
1595 #endif
1596
1597 #if FF_API_PRIVATE_OPT
1598 /** @deprecated use encoder private options instead */
1599 attribute_deprecated
1600 int b_frame_strategy;
1601 #endif
1602
1603 /**
1604 * qscale offset between IP and B-frames
1605 * - encoding: Set by user.
1606 * - decoding: unused
1607 */
1608 float b_quant_offset;
1609
1610 /**
1611 * Size of the frame reordering buffer in the decoder.
1612 * For MPEG-2 it is 1 IPB or 0 low delay IP.
1613 * - encoding: Set by libavcodec.
1614 * - decoding: Set by libavcodec.
1615 */
1616 int has_b_frames;
1617
1618 #if FF_API_PRIVATE_OPT
1619 /** @deprecated use encoder private options instead */
1620 attribute_deprecated
1621 int mpeg_quant;
1622 #endif
1623
1624 /**
1625 * qscale factor between P and I-frames
1626 * If > 0 then the last p frame quantizer will be used (q= lastp_q*factor+offset).
1627 * If < 0 then normal ratecontrol will be done (q= -normal_q*factor+offset).
1628 * - encoding: Set by user.
1629 * - decoding: unused
1630 */
1631 float i_quant_factor;
1632
1633 /**
1634 * qscale offset between P and I-frames
1635 * - encoding: Set by user.
1636 * - decoding: unused
1637 */
1638 float i_quant_offset;
1639
1640 /**
1641 * luminance masking (0-> disabled)
1642 * - encoding: Set by user.
1643 * - decoding: unused
1644 */
1645 float lumi_masking;
1646
1647 /**
1648 * temporary complexity masking (0-> disabled)
1649 * - encoding: Set by user.
1650 * - decoding: unused
1651 */
1652 float temporal_cplx_masking;
1653
1654 /**
1655 * spatial complexity masking (0-> disabled)
1656 * - encoding: Set by user.
1657 * - decoding: unused
1658 */
1659 float spatial_cplx_masking;
1660
1661 /**
1662 * p block masking (0-> disabled)
1663 * - encoding: Set by user.
1664 * - decoding: unused
1665 */
1666 float p_masking;
1667
1668 /**
1669 * darkness masking (0-> disabled)
1670 * - encoding: Set by user.
1671 * - decoding: unused
1672 */
1673 float dark_masking;
1674
1675 /**
1676 * slice count
1677 * - encoding: Set by libavcodec.
1678 * - decoding: Set by user (or 0).
1679 */
1680 int slice_count;
1681 /**
1682 * prediction method (needed for huffyuv)
1683 * - encoding: Set by user.
1684 * - decoding: unused
1685 */
1686 int prediction_method;
1687 #define FF_PRED_LEFT 0
1688 #define FF_PRED_PLANE 1
1689 #define FF_PRED_MEDIAN 2
1690
1691 /**
1692 * slice offsets in the frame in bytes
1693 * - encoding: Set/allocated by libavcodec.
1694 * - decoding: Set/allocated by user (or NULL).
1695 */
1696 int *slice_offset;
1697
1698 /**
1699 * sample aspect ratio (0 if unknown)
1700 * That is the width of a pixel divided by the height of the pixel.
1701 * Numerator and denominator must be relatively prime and smaller than 256 for some video standards.
1702 * - encoding: Set by user.
1703 * - decoding: Set by libavcodec.
1704 */
1705 AVRational sample_aspect_ratio;
1706
1707 /**
1708 * motion estimation comparison function
1709 * - encoding: Set by user.
1710 * - decoding: unused
1711 */
1712 int me_cmp;
1713 /**
1714 * subpixel motion estimation comparison function
1715 * - encoding: Set by user.
1716 * - decoding: unused
1717 */
1718 int me_sub_cmp;
1719 /**
1720 * macroblock comparison function (not supported yet)
1721 * - encoding: Set by user.
1722 * - decoding: unused
1723 */
1724 int mb_cmp;
1725 /**
1726 * interlaced DCT comparison function
1727 * - encoding: Set by user.
1728 * - decoding: unused
1729 */
1730 int ildct_cmp;
1731 #define FF_CMP_SAD 0
1732 #define FF_CMP_SSE 1
1733 #define FF_CMP_SATD 2
1734 #define FF_CMP_DCT 3
1735 #define FF_CMP_PSNR 4
1736 #define FF_CMP_BIT 5
1737 #define FF_CMP_RD 6
1738 #define FF_CMP_ZERO 7
1739 #define FF_CMP_VSAD 8
1740 #define FF_CMP_VSSE 9
1741 #define FF_CMP_NSSE 10
1742 #define FF_CMP_DCTMAX 13
1743 #define FF_CMP_DCT264 14
1744 #define FF_CMP_CHROMA 256
1745
1746 /**
1747 * ME diamond size & shape
1748 * - encoding: Set by user.
1749 * - decoding: unused
1750 */
1751 int dia_size;
1752
1753 /**
1754 * amount of previous MV predictors (2a+1 x 2a+1 square)
1755 * - encoding: Set by user.
1756 * - decoding: unused
1757 */
1758 int last_predictor_count;
1759
1760 /**
1761 * prepass for motion estimation
1762 * - encoding: Set by user.
1763 * - decoding: unused
1764 */
1765 int pre_me;
1766
1767 /**
1768 * motion estimation prepass comparison function
1769 * - encoding: Set by user.
1770 * - decoding: unused
1771 */
1772 int me_pre_cmp;
1773
1774 /**
1775 * ME prepass diamond size & shape
1776 * - encoding: Set by user.
1777 * - decoding: unused
1778 */
1779 int pre_dia_size;
1780
1781 /**
1782 * subpel ME quality
1783 * - encoding: Set by user.
1784 * - decoding: unused
1785 */
1786 int me_subpel_quality;
1787
1788 #if FF_API_AFD
1789 /**
1790 * DTG active format information (additional aspect ratio
1791 * information only used in DVB MPEG-2 transport streams)
1792 * 0 if not set.
1793 *
1794 * - encoding: unused
1795 * - decoding: Set by decoder.
1796 * @deprecated Deprecated in favor of AVSideData
1797 */
1798 attribute_deprecated int dtg_active_format;
1799 #define FF_DTG_AFD_SAME 8
1800 #define FF_DTG_AFD_4_3 9
1801 #define FF_DTG_AFD_16_9 10
1802 #define FF_DTG_AFD_14_9 11
1803 #define FF_DTG_AFD_4_3_SP_14_9 13
1804 #define FF_DTG_AFD_16_9_SP_14_9 14
1805 #define FF_DTG_AFD_SP_4_3 15
1806 #endif /* FF_API_AFD */
1807
1808 /**
1809 * maximum motion estimation search range in subpel units
1810 * If 0 then no limit.
1811 *
1812 * - encoding: Set by user.
1813 * - decoding: unused
1814 */
1815 int me_range;
1816
1817 #if FF_API_QUANT_BIAS
1818 /**
1819 * @deprecated use encoder private option instead
1820 */
1821 attribute_deprecated int intra_quant_bias;
1822 #define FF_DEFAULT_QUANT_BIAS 999999
1823
1824 /**
1825 * @deprecated use encoder private option instead
1826 */
1827 attribute_deprecated int inter_quant_bias;
1828 #endif
1829
1830 /**
1831 * slice flags
1832 * - encoding: unused
1833 * - decoding: Set by user.
1834 */
1835 int slice_flags;
1836 #define SLICE_FLAG_CODED_ORDER 0x0001 ///< draw_horiz_band() is called in coded order instead of display
1837 #define SLICE_FLAG_ALLOW_FIELD 0x0002 ///< allow draw_horiz_band() with field slices (MPEG2 field pics)
1838 #define SLICE_FLAG_ALLOW_PLANE 0x0004 ///< allow draw_horiz_band() with 1 component at a time (SVQ1)
1839
1840 #if FF_API_XVMC
1841 /**
1842 * XVideo Motion Acceleration
1843 * - encoding: forbidden
1844 * - decoding: set by decoder
1845 * @deprecated XvMC support is slated for removal.
1846 */
1847 attribute_deprecated int xvmc_acceleration;
1848 #endif /* FF_API_XVMC */
1849
1850 /**
1851 * macroblock decision mode
1852 * - encoding: Set by user.
1853 * - decoding: unused
1854 */
1855 int mb_decision;
1856 #define FF_MB_DECISION_SIMPLE 0 ///< uses mb_cmp
1857 #define FF_MB_DECISION_BITS 1 ///< chooses the one which needs the fewest bits
1858 #define FF_MB_DECISION_RD 2 ///< rate distortion
1859
1860 /**
1861 * custom intra quantization matrix
1862 * - encoding: Set by user, can be NULL.
1863 * - decoding: Set by libavcodec.
1864 */
1865 uint16_t *intra_matrix;
1866
1867 /**
1868 * custom inter quantization matrix
1869 * - encoding: Set by user, can be NULL.
1870 * - decoding: Set by libavcodec.
1871 */
1872 uint16_t *inter_matrix;
1873
1874 #if FF_API_PRIVATE_OPT
1875 /** @deprecated use encoder private options instead */
1876 attribute_deprecated
1877 int scenechange_threshold;
1878
1879 /** @deprecated use encoder private options instead */
1880 attribute_deprecated
1881 int noise_reduction;
1882 #endif
1883
1884 #if FF_API_MPV_OPT
1885 /**
1886 * @deprecated this field is unused
1887 */
1888 attribute_deprecated
1889 int me_threshold;
1890
1891 /**
1892 * @deprecated this field is unused
1893 */
1894 attribute_deprecated
1895 int mb_threshold;
1896 #endif
1897
1898 /**
1899 * precision of the intra DC coefficient - 8
1900 * - encoding: Set by user.
1901 * - decoding: unused
1902 */
1903 int intra_dc_precision;
1904
1905 /**
1906 * Number of macroblock rows at the top which are skipped.
1907 * - encoding: unused
1908 * - decoding: Set by user.
1909 */
1910 int skip_top;
1911
1912 /**
1913 * Number of macroblock rows at the bottom which are skipped.
1914 * - encoding: unused
1915 * - decoding: Set by user.
1916 */
1917 int skip_bottom;
1918
1919 #if FF_API_MPV_OPT
1920 /**
1921 * @deprecated use encoder private options instead
1922 */
1923 attribute_deprecated
1924 float border_masking;
1925 #endif
1926
1927 /**
1928 * minimum MB lagrange multipler
1929 * - encoding: Set by user.
1930 * - decoding: unused
1931 */
1932 int mb_lmin;
1933
1934 /**
1935 * maximum MB lagrange multipler
1936 * - encoding: Set by user.
1937 * - decoding: unused
1938 */
1939 int mb_lmax;
1940
1941 /**
1942 *
1943 * - encoding: Set by user.
1944 * - decoding: unused
1945 */
1946 int me_penalty_compensation;
1947
1948 /**
1949 *
1950 * - encoding: Set by user.
1951 * - decoding: unused
1952 */
1953 int bidir_refine;
1954
1955 #if FF_API_PRIVATE_OPT
1956 /** @deprecated use encoder private options instead */
1957 attribute_deprecated
1958 int brd_scale;
1959 #endif
1960
1961 /**
1962 * minimum GOP size
1963 * - encoding: Set by user.
1964 * - decoding: unused
1965 */
1966 int keyint_min;
1967
1968 /**
1969 * number of reference frames
1970 * - encoding: Set by user.
1971 * - decoding: Set by lavc.
1972 */
1973 int refs;
1974
1975 #if FF_API_PRIVATE_OPT
1976 /** @deprecated use encoder private options instead */
1977 attribute_deprecated
1978 int chromaoffset;
1979 #endif
1980
1981 #if FF_API_UNUSED_MEMBERS
1982 /**
1983 * Multiplied by qscale for each frame and added to scene_change_score.
1984 * - encoding: Set by user.
1985 * - decoding: unused
1986 */
1987 attribute_deprecated int scenechange_factor;
1988 #endif
1989
1990 /**
1991 *
1992 * Note: Value depends upon the compare function used for fullpel ME.
1993 * - encoding: Set by user.
1994 * - decoding: unused
1995 */
1996 int mv0_threshold;
1997
1998 #if FF_API_PRIVATE_OPT
1999 /** @deprecated use encoder private options instead */
2000 attribute_deprecated
2001 int b_sensitivity;
2002 #endif
2003
2004 /**
2005 * Chromaticity coordinates of the source primaries.
2006 * - encoding: Set by user
2007 * - decoding: Set by libavcodec
2008 */
2009 enum AVColorPrimaries color_primaries;
2010
2011 /**
2012 * Color Transfer Characteristic.
2013 * - encoding: Set by user
2014 * - decoding: Set by libavcodec
2015 */
2016 enum AVColorTransferCharacteristic color_trc;
2017
2018 /**
2019 * YUV colorspace type.
2020 * - encoding: Set by user
2021 * - decoding: Set by libavcodec
2022 */
2023 enum AVColorSpace colorspace;
2024
2025 /**
2026 * MPEG vs JPEG YUV range.
2027 * - encoding: Set by user
2028 * - decoding: Set by libavcodec
2029 */
2030 enum AVColorRange color_range;
2031
2032 /**
2033 * This defines the location of chroma samples.
2034 * - encoding: Set by user
2035 * - decoding: Set by libavcodec
2036 */
2037 enum AVChromaLocation chroma_sample_location;
2038
2039 /**
2040 * Number of slices.
2041 * Indicates number of picture subdivisions. Used for parallelized
2042 * decoding.
2043 * - encoding: Set by user
2044 * - decoding: unused
2045 */
2046 int slices;
2047
2048 /** Field order
2049 * - encoding: set by libavcodec
2050 * - decoding: Set by libavcodec
2051 */
2052 enum AVFieldOrder field_order;
2053
2054 /* audio only */
2055 int sample_rate; ///< samples per second
2056 int channels; ///< number of audio channels
2057
2058 /**
2059 * audio sample format
2060 * - encoding: Set by user.
2061 * - decoding: Set by libavcodec.
2062 */
2063 enum AVSampleFormat sample_fmt; ///< sample format
2064
2065 /* The following data should not be initialized. */
2066 /**
2067 * Number of samples per channel in an audio frame.
2068 *
2069 * - encoding: set by libavcodec in avcodec_open2(). Each submitted frame
2070 * except the last must contain exactly frame_size samples per channel.
2071 * May be 0 when the codec has AV_CODEC_CAP_VARIABLE_FRAME_SIZE set, then the
2072 * frame size is not restricted.
2073 * - decoding: may be set by some decoders to indicate constant frame size
2074 */
2075 int frame_size;
2076
2077 /**
2078 * Frame counter, set by libavcodec.
2079 *
2080 * - decoding: total number of frames returned from the decoder so far.
2081 * - encoding: total number of frames passed to the encoder so far.
2082 *
2083 * @note the counter is not incremented if encoding/decoding resulted in
2084 * an error.
2085 */
2086 int frame_number;
2087
2088 /**
2089 * number of bytes per packet if constant and known or 0
2090 * Used by some WAV based audio codecs.
2091 */
2092 int block_align;
2093
2094 /**
2095 * Audio cutoff bandwidth (0 means "automatic")
2096 * - encoding: Set by user.
2097 * - decoding: unused
2098 */
2099 int cutoff;
2100
2101 /**
2102 * Audio channel layout.
2103 * - encoding: set by user.
2104 * - decoding: set by libavcodec.
2105 */
2106 uint64_t channel_layout;
2107
2108 /**
2109 * Request decoder to use this channel layout if it can (0 for default)
2110 * - encoding: unused
2111 * - decoding: Set by user.
2112 */
2113 uint64_t request_channel_layout;
2114
2115 /**
2116 * Type of service that the audio stream conveys.
2117 * - encoding: Set by user.
2118 * - decoding: Set by libavcodec.
2119 */
2120 enum AVAudioServiceType audio_service_type;
2121
2122 /**
2123 * Used to request a sample format from the decoder.
2124 * - encoding: unused.
2125 * - decoding: Set by user.
2126 */
2127 enum AVSampleFormat request_sample_fmt;
2128
2129 /**
2130 * This callback is called at the beginning of each frame to get data
2131 * buffer(s) for it. There may be one contiguous buffer for all the data or
2132 * there may be a buffer per each data plane or anything in between. What
2133 * this means is, you may set however many entries in buf[] you feel necessary.
2134 * Each buffer must be reference-counted using the AVBuffer API (see description
2135 * of buf[] below).
2136 *
2137 * The following fields will be set in the frame before this callback is
2138 * called:
2139 * - format
2140 * - width, height (video only)
2141 * - sample_rate, channel_layout, nb_samples (audio only)
2142 * Their values may differ from the corresponding values in
2143 * AVCodecContext. This callback must use the frame values, not the codec
2144 * context values, to calculate the required buffer size.
2145 *
2146 * This callback must fill the following fields in the frame:
2147 * - data[]
2148 * - linesize[]
2149 * - extended_data:
2150 * * if the data is planar audio with more than 8 channels, then this
2151 * callback must allocate and fill extended_data to contain all pointers
2152 * to all data planes. data[] must hold as many pointers as it can.
2153 * extended_data must be allocated with av_malloc() and will be freed in
2154 * av_frame_unref().
2155 * * otherwise exended_data must point to data
2156 * - buf[] must contain one or more pointers to AVBufferRef structures. Each of
2157 * the frame's data and extended_data pointers must be contained in these. That
2158 * is, one AVBufferRef for each allocated chunk of memory, not necessarily one
2159 * AVBufferRef per data[] entry. See: av_buffer_create(), av_buffer_alloc(),
2160 * and av_buffer_ref().
2161 * - extended_buf and nb_extended_buf must be allocated with av_malloc() by
2162 * this callback and filled with the extra buffers if there are more
2163 * buffers than buf[] can hold. extended_buf will be freed in
2164 * av_frame_unref().
2165 *
2166 * If AV_CODEC_CAP_DR1 is not set then get_buffer2() must call
2167 * avcodec_default_get_buffer2() instead of providing buffers allocated by
2168 * some other means.
2169 *
2170 * Each data plane must be aligned to the maximum required by the target
2171 * CPU.
2172 *
2173 * @see avcodec_default_get_buffer2()
2174 *
2175 * Video:
2176 *
2177 * If AV_GET_BUFFER_FLAG_REF is set in flags then the frame may be reused
2178 * (read and/or written to if it is writable) later by libavcodec.
2179 *
2180 * avcodec_align_dimensions2() should be used to find the required width and
2181 * height, as they normally need to be rounded up to the next multiple of 16.
2182 *
2183 * If frame multithreading is used and thread_safe_callbacks is set,
2184 * this callback may be called from a different thread, but not from more
2185 * than one at once. Does not need to be reentrant.
2186 *
2187 * @see avcodec_align_dimensions2()
2188 *
2189 * Audio:
2190 *
2191 * Decoders request a buffer of a particular size by setting
2192 * AVFrame.nb_samples prior to calling get_buffer2(). The decoder may,
2193 * however, utilize only part of the buffer by setting AVFrame.nb_samples
2194 * to a smaller value in the output frame.
2195 *
2196 * As a convenience, av_samples_get_buffer_size() and
2197 * av_samples_fill_arrays() in libavutil may be used by custom get_buffer2()
2198 * functions to find the required data size and to fill data pointers and
2199 * linesize. In AVFrame.linesize, only linesize[0] may be set for audio
2200 * since all planes must be the same size.
2201 *
2202 * @see av_samples_get_buffer_size(), av_samples_fill_arrays()
2203 *
2204 * - encoding: unused
2205 * - decoding: Set by libavcodec, user can override.
2206 */
2207 int (*get_buffer2)(struct AVCodecContext *s, AVFrame *frame, int flags);
2208
2209 /**
2210 * If non-zero, the decoded audio and video frames returned from
2211 * avcodec_decode_video2() and avcodec_decode_audio4() are reference-counted
2212 * and are valid indefinitely. The caller must free them with
2213 * av_frame_unref() when they are not needed anymore.
2214 * Otherwise, the decoded frames must not be freed by the caller and are
2215 * only valid until the next decode call.
2216 *
2217 * - encoding: unused
2218 * - decoding: set by the caller before avcodec_open2().
2219 */
2220 int refcounted_frames;
2221
2222 /* - encoding parameters */
2223 float qcompress; ///< amount of qscale change between easy & hard scenes (0.0-1.0)
2224 float qblur; ///< amount of qscale smoothing over time (0.0-1.0)
2225
2226 /**
2227 * minimum quantizer
2228 * - encoding: Set by user.
2229 * - decoding: unused
2230 */
2231 int qmin;
2232
2233 /**
2234 * maximum quantizer
2235 * - encoding: Set by user.
2236 * - decoding: unused
2237 */
2238 int qmax;
2239
2240 /**
2241 * maximum quantizer difference between frames
2242 * - encoding: Set by user.
2243 * - decoding: unused
2244 */
2245 int max_qdiff;
2246
2247 #if FF_API_MPV_OPT
2248 /**
2249 * @deprecated use encoder private options instead
2250 */
2251 attribute_deprecated
2252 float rc_qsquish;
2253
2254 attribute_deprecated
2255 float rc_qmod_amp;
2256 attribute_deprecated
2257 int rc_qmod_freq;
2258 #endif
2259
2260 /**
2261 * decoder bitstream buffer size
2262 * - encoding: Set by user.
2263 * - decoding: unused
2264 */
2265 int rc_buffer_size;
2266
2267 /**
2268 * ratecontrol override, see RcOverride
2269 * - encoding: Allocated/set/freed by user.
2270 * - decoding: unused
2271 */
2272 int rc_override_count;
2273 RcOverride *rc_override;
2274
2275 #if FF_API_MPV_OPT
2276 /**
2277 * @deprecated use encoder private options instead
2278 */
2279 attribute_deprecated
2280 const char *rc_eq;
2281 #endif
2282
2283 /**
2284 * maximum bitrate
2285 * - encoding: Set by user.
2286 * - decoding: unused
2287 */
2288 int rc_max_rate;
2289
2290 /**
2291 * minimum bitrate
2292 * - encoding: Set by user.
2293 * - decoding: unused
2294 */
2295 int rc_min_rate;
2296
2297 #if FF_API_MPV_OPT
2298 /**
2299 * @deprecated use encoder private options instead
2300 */
2301 attribute_deprecated
2302 float rc_buffer_aggressivity;
2303
2304 attribute_deprecated
2305 float rc_initial_cplx;
2306 #endif
2307
2308 /**
2309 * Ratecontrol attempt to use, at maximum, <value> of what can be used without an underflow.
2310 * - encoding: Set by user.
2311 * - decoding: unused.
2312 */
2313 float rc_max_available_vbv_use;
2314
2315 /**
2316 * Ratecontrol attempt to use, at least, <value> times the amount needed to prevent a vbv overflow.
2317 * - encoding: Set by user.
2318 * - decoding: unused.
2319 */
2320 float rc_min_vbv_overflow_use;
2321
2322 /**
2323 * Number of bits which should be loaded into the rc buffer before decoding starts.
2324 * - encoding: Set by user.
2325 * - decoding: unused
2326 */
2327 int rc_initial_buffer_occupancy;
2328
2329 #if FF_API_CODER_TYPE
2330 #define FF_CODER_TYPE_VLC 0
2331 #define FF_CODER_TYPE_AC 1
2332 #define FF_CODER_TYPE_RAW 2
2333 #define FF_CODER_TYPE_RLE 3
2334 #if FF_API_UNUSED_MEMBERS
2335 #define FF_CODER_TYPE_DEFLATE 4
2336 #endif /* FF_API_UNUSED_MEMBERS */
2337 /**
2338 * @deprecated use encoder private options instead
2339 */
2340 attribute_deprecated
2341 int coder_type;
2342 #endif /* FF_API_CODER_TYPE */
2343
2344 #if FF_API_PRIVATE_OPT
2345 /** @deprecated use encoder private options instead */
2346 attribute_deprecated
2347 int context_model;
2348 #endif
2349
2350 #if FF_API_MPV_OPT
2351 /**
2352 * @deprecated use encoder private options instead
2353 */
2354 attribute_deprecated
2355 int lmin;
2356
2357 /**
2358 * @deprecated use encoder private options instead
2359 */
2360 attribute_deprecated
2361 int lmax;
2362 #endif
2363
2364 #if FF_API_PRIVATE_OPT
2365 /** @deprecated use encoder private options instead */
2366 attribute_deprecated
2367 int frame_skip_threshold;
2368
2369 /** @deprecated use encoder private options instead */
2370 attribute_deprecated
2371 int frame_skip_factor;
2372
2373 /** @deprecated use encoder private options instead */
2374 attribute_deprecated
2375 int frame_skip_exp;
2376
2377 /** @deprecated use encoder private options instead */
2378 attribute_deprecated
2379 int frame_skip_cmp;
2380 #endif /* FF_API_PRIVATE_OPT */
2381
2382 /**
2383 * trellis RD quantization
2384 * - encoding: Set by user.
2385 * - decoding: unused
2386 */
2387 int trellis;
2388
2389 /**
2390 * - encoding: Set by user.
2391 * - decoding: unused
2392 */
2393 int min_prediction_order;
2394
2395 /**
2396 * - encoding: Set by user.
2397 * - decoding: unused
2398 */
2399 int max_prediction_order;
2400
2401 /**
2402 * GOP timecode frame start number, in non drop frame format
2403 * - encoding: Set by user.
2404 * - decoding: unused
2405 */
2406 int64_t timecode_frame_start;
2407
2408 #if FF_API_RTP_CALLBACK
2409 /**
2410 * @deprecated unused
2411 */
2412 /* The RTP callback: This function is called */
2413 /* every time the encoder has a packet to send. */
2414 /* It depends on the encoder if the data starts */
2415 /* with a Start Code (it should). H.263 does. */
2416 /* mb_nb contains the number of macroblocks */
2417 /* encoded in the RTP payload. */
2418 attribute_deprecated
2419 void (*rtp_callback)(struct AVCodecContext *avctx, void *data, int size, int mb_nb);
2420 #endif
2421
2422 int rtp_payload_size; /* The size of the RTP payload: the coder will */
2423 /* do its best to deliver a chunk with size */
2424 /* below rtp_payload_size, the chunk will start */
2425 /* with a start code on some codecs like H.263. */
2426 /* This doesn't take account of any particular */
2427 /* headers inside the transmitted RTP payload. */
2428
2429 #if FF_API_STAT_BITS
2430 /* statistics, used for 2-pass encoding */
2431 attribute_deprecated
2432 int mv_bits;
2433 attribute_deprecated
2434 int header_bits;
2435 attribute_deprecated
2436 int i_tex_bits;
2437 attribute_deprecated
2438 int p_tex_bits;
2439 attribute_deprecated
2440 int i_count;
2441 attribute_deprecated
2442 int p_count;
2443 attribute_deprecated
2444 int skip_count;
2445 attribute_deprecated
2446 int misc_bits;
2447
2448 /** @deprecated this field is unused */
2449 attribute_deprecated
2450 int frame_bits;
2451 #endif
2452
2453 /**
2454 * pass1 encoding statistics output buffer
2455 * - encoding: Set by libavcodec.
2456 * - decoding: unused
2457 */
2458 char *stats_out;
2459
2460 /**
2461 * pass2 encoding statistics input buffer
2462 * Concatenated stuff from stats_out of pass1 should be placed here.
2463 * - encoding: Allocated/set/freed by user.
2464 * - decoding: unused
2465 */
2466 char *stats_in;
2467
2468 /**
2469 * Work around bugs in encoders which sometimes cannot be detected automatically.
2470 * - encoding: Set by user
2471 * - decoding: Set by user
2472 */
2473 int workaround_bugs;
2474 #define FF_BUG_AUTODETECT 1 ///< autodetection
2475 #if FF_API_OLD_MSMPEG4
2476 #define FF_BUG_OLD_MSMPEG4 2
2477 #endif
2478 #define FF_BUG_XVID_ILACE 4
2479 #define FF_BUG_UMP4 8
2480 #define FF_BUG_NO_PADDING 16
2481 #define FF_BUG_AMV 32
2482 #if FF_API_AC_VLC
2483 #define FF_BUG_AC_VLC 0 ///< Will be removed, libavcodec can now handle these non-compliant files by default.
2484 #endif
2485 #define FF_BUG_QPEL_CHROMA 64
2486 #define FF_BUG_STD_QPEL 128
2487 #define FF_BUG_QPEL_CHROMA2 256
2488 #define FF_BUG_DIRECT_BLOCKSIZE 512
2489 #define FF_BUG_EDGE 1024
2490 #define FF_BUG_HPEL_CHROMA 2048
2491 #define FF_BUG_DC_CLIP 4096
2492 #define FF_BUG_MS 8192 ///< Work around various bugs in Microsoft's broken decoders.
2493 #define FF_BUG_TRUNCATED 16384
2494
2495 /**
2496 * strictly follow the standard (MPEG4, ...).
2497 * - encoding: Set by user.
2498 * - decoding: Set by user.
2499 * Setting this to STRICT or higher means the encoder and decoder will
2500 * generally do stupid things, whereas setting it to unofficial or lower
2501 * will mean the encoder might produce output that is not supported by all
2502 * spec-compliant decoders. Decoders don't differentiate between normal,
2503 * unofficial and experimental (that is, they always try to decode things
2504 * when they can) unless they are explicitly asked to behave stupidly
2505 * (=strictly conform to the specs)
2506 */
2507 int strict_std_compliance;
2508 #define FF_COMPLIANCE_VERY_STRICT 2 ///< Strictly conform to an older more strict version of the spec or reference software.
2509 #define FF_COMPLIANCE_STRICT 1 ///< Strictly conform to all the things in the spec no matter what consequences.
2510 #define FF_COMPLIANCE_NORMAL 0
2511 #define FF_COMPLIANCE_UNOFFICIAL -1 ///< Allow unofficial extensions
2512 #define FF_COMPLIANCE_EXPERIMENTAL -2 ///< Allow nonstandardized experimental things.
2513
2514 /**
2515 * error concealment flags
2516 * - encoding: unused
2517 * - decoding: Set by user.
2518 */
2519 int error_concealment;
2520 #define FF_EC_GUESS_MVS 1
2521 #define FF_EC_DEBLOCK 2
2522
2523 /**
2524 * debug
2525 * - encoding: Set by user.
2526 * - decoding: Set by user.
2527 */
2528 int debug;
2529 #define FF_DEBUG_PICT_INFO 1
2530 #define FF_DEBUG_RC 2
2531 #define FF_DEBUG_BITSTREAM 4
2532 #define FF_DEBUG_MB_TYPE 8
2533 #define FF_DEBUG_QP 16
2534 #if FF_API_DEBUG_MV
2535 /**
2536 * @deprecated this option does nothing
2537 */
2538 #define FF_DEBUG_MV 32
2539 #endif
2540 #define FF_DEBUG_DCT_COEFF 0x00000040
2541 #define FF_DEBUG_SKIP 0x00000080
2542 #define FF_DEBUG_STARTCODE 0x00000100
2543 #if FF_API_UNUSED_MEMBERS
2544 #define FF_DEBUG_PTS 0x00000200
2545 #endif /* FF_API_UNUSED_MEMBERS */
2546 #define FF_DEBUG_ER 0x00000400
2547 #define FF_DEBUG_MMCO 0x00000800
2548 #define FF_DEBUG_BUGS 0x00001000
2549 #if FF_API_DEBUG_MV
2550 #define FF_DEBUG_VIS_QP 0x00002000
2551 #define FF_DEBUG_VIS_MB_TYPE 0x00004000
2552 #endif
2553 #define FF_DEBUG_BUFFERS 0x00008000
2554 #define FF_DEBUG_THREADS 0x00010000
2555
2556 #if FF_API_DEBUG_MV
2557 /**
2558 * @deprecated this option does not have any effect
2559 */
2560 attribute_deprecated
2561 int debug_mv;
2562 #define FF_DEBUG_VIS_MV_P_FOR 0x00000001 //visualize forward predicted MVs of P frames
2563 #define FF_DEBUG_VIS_MV_B_FOR 0x00000002 //visualize forward predicted MVs of B frames
2564 #define FF_DEBUG_VIS_MV_B_BACK 0x00000004 //visualize backward predicted MVs of B frames
2565 #endif
2566
2567 /**
2568 * Error recognition; may misdetect some more or less valid parts as errors.
2569 * - encoding: unused
2570 * - decoding: Set by user.
2571 */
2572 int err_recognition;
2573
2574 /**
2575 * Verify checksums embedded in the bitstream (could be of either encoded or
2576 * decoded data, depending on the codec) and print an error message on mismatch.
2577 * If AV_EF_EXPLODE is also set, a mismatching checksum will result in the
2578 * decoder returning an error.
2579 */
2580 #define AV_EF_CRCCHECK (1<<0)
2581 #define AV_EF_BITSTREAM (1<<1)
2582 #define AV_EF_BUFFER (1<<2)
2583 #define AV_EF_EXPLODE (1<<3)
2584
2585 /**
2586 * opaque 64bit number (generally a PTS) that will be reordered and
2587 * output in AVFrame.reordered_opaque
2588 * - encoding: unused
2589 * - decoding: Set by user.
2590 */
2591 int64_t reordered_opaque;
2592
2593 /**
2594 * Hardware accelerator in use
2595 * - encoding: unused.
2596 * - decoding: Set by libavcodec
2597 */
2598 struct AVHWAccel *hwaccel;
2599
2600 /**
2601 * Hardware accelerator context.
2602 * For some hardware accelerators, a global context needs to be
2603 * provided by the user. In that case, this holds display-dependent
2604 * data Libav cannot instantiate itself. Please refer to the
2605 * Libav HW accelerator documentation to know how to fill this
2606 * is. e.g. for VA API, this is a struct vaapi_context.
2607 * - encoding: unused
2608 * - decoding: Set by user
2609 */
2610 void *hwaccel_context;
2611
2612 /**
2613 * error
2614 * - encoding: Set by libavcodec if flags & AV_CODEC_FLAG_PSNR.
2615 * - decoding: unused
2616 */
2617 uint64_t error[AV_NUM_DATA_POINTERS];
2618
2619 /**
2620 * DCT algorithm, see FF_DCT_* below
2621 * - encoding: Set by user.
2622 * - decoding: unused
2623 */
2624 int dct_algo;
2625 #define FF_DCT_AUTO 0
2626 #define FF_DCT_FASTINT 1
2627 #define FF_DCT_INT 2
2628 #define FF_DCT_MMX 3
2629 #define FF_DCT_ALTIVEC 5
2630 #define FF_DCT_FAAN 6
2631
2632 /**
2633 * IDCT algorithm, see FF_IDCT_* below.
2634 * - encoding: Set by user.
2635 * - decoding: Set by user.
2636 */
2637 int idct_algo;
2638 #define FF_IDCT_AUTO 0
2639 #define FF_IDCT_INT 1
2640 #define FF_IDCT_SIMPLE 2
2641 #define FF_IDCT_SIMPLEMMX 3
2642 #define FF_IDCT_ARM 7
2643 #define FF_IDCT_ALTIVEC 8
2644 #if FF_API_ARCH_SH4
2645 #define FF_IDCT_SH4 9
2646 #endif
2647 #define FF_IDCT_SIMPLEARM 10
2648 #if FF_API_UNUSED_MEMBERS
2649 #define FF_IDCT_IPP 13
2650 #endif /* FF_API_UNUSED_MEMBERS */
2651 #define FF_IDCT_XVID 14
2652 #if FF_API_IDCT_XVIDMMX
2653 #define FF_IDCT_XVIDMMX 14
2654 #endif /* FF_API_IDCT_XVIDMMX */
2655 #define FF_IDCT_SIMPLEARMV5TE 16
2656 #define FF_IDCT_SIMPLEARMV6 17
2657 #if FF_API_ARCH_SPARC
2658 #define FF_IDCT_SIMPLEVIS 18
2659 #endif
2660 #define FF_IDCT_FAAN 20
2661 #define FF_IDCT_SIMPLENEON 22
2662 #if FF_API_ARCH_ALPHA
2663 #define FF_IDCT_SIMPLEALPHA 23
2664 #endif
2665
2666 /**
2667 * bits per sample/pixel from the demuxer (needed for huffyuv).
2668 * - encoding: Set by libavcodec.
2669 * - decoding: Set by user.
2670 */
2671 int bits_per_coded_sample;
2672
2673 /**
2674 * Bits per sample/pixel of internal libavcodec pixel/sample format.
2675 * - encoding: set by user.
2676 * - decoding: set by libavcodec.
2677 */
2678 int bits_per_raw_sample;
2679
2680 #if FF_API_LOWRES
2681 /**
2682 * low resolution decoding, 1-> 1/2 size, 2->1/4 size
2683 * - encoding: unused
2684 * - decoding: Set by user.
2685 *
2686 * @deprecated use decoder private options instead
2687 */
2688 attribute_deprecated int lowres;
2689 #endif
2690
2691 #if FF_API_CODED_FRAME
2692 /**
2693 * the picture in the bitstream
2694 * - encoding: Set by libavcodec.
2695 * - decoding: unused
2696 *
2697 * @deprecated use the quality factor packet side data instead
2698 */
2699 attribute_deprecated AVFrame *coded_frame;
2700 #endif
2701
2702 /**
2703 * thread count
2704 * is used to decide how many independent tasks should be passed to execute()
2705 * - encoding: Set by user.
2706 * - decoding: Set by user.
2707 */
2708 int thread_count;
2709
2710 /**
2711 * Which multithreading methods to use.
2712 * Use of FF_THREAD_FRAME will increase decoding delay by one frame per thread,
2713 * so clients which cannot provide future frames should not use it.
2714 *
2715 * - encoding: Set by user, otherwise the default is used.
2716 * - decoding: Set by user, otherwise the default is used.
2717 */
2718 int thread_type;
2719 #define FF_THREAD_FRAME 1 ///< Decode more than one frame at once
2720 #define FF_THREAD_SLICE 2 ///< Decode more than one part of a single frame at once
2721
2722 /**
2723 * Which multithreading methods are in use by the codec.
2724 * - encoding: Set by libavcodec.
2725 * - decoding: Set by libavcodec.
2726 */
2727 int active_thread_type;
2728
2729 /**
2730 * Set by the client if its custom get_buffer() callback can be called
2731 * synchronously from another thread, which allows faster multithreaded decoding.
2732 * draw_horiz_band() will be called from other threads regardless of this setting.
2733 * Ignored if the default get_buffer() is used.
2734 * - encoding: Set by user.
2735 * - decoding: Set by user.
2736 */
2737 int thread_safe_callbacks;
2738
2739 /**
2740 * The codec may call this to execute several independent things.
2741 * It will return only after finishing all tasks.
2742 * The user may replace this with some multithreaded implementation,
2743 * the default implementation will execute the parts serially.
2744 * @param count the number of things to execute
2745 * - encoding: Set by libavcodec, user can override.
2746 * - decoding: Set by libavcodec, user can override.
2747 */
2748 int (*execute)(struct AVCodecContext *c, int (*func)(struct AVCodecContext *c2, void *arg), void *arg2, int *ret, int count, int size);
2749
2750 /**
2751 * The codec may call this to execute several independent things.
2752 * It will return only after finishing all tasks.
2753 * The user may replace this with some multithreaded implementation,
2754 * the default implementation will execute the parts serially.
2755 * Also see avcodec_thread_init and e.g. the --enable-pthread configure option.
2756 * @param c context passed also to func
2757 * @param count the number of things to execute
2758 * @param arg2 argument passed unchanged to func
2759 * @param ret return values of executed functions, must have space for "count" values. May be NULL.
2760 * @param func function that will be called count times, with jobnr from 0 to count-1.
2761 * threadnr will be in the range 0 to c->thread_count-1 < MAX_THREADS and so that no
2762 * two instances of func executing at the same time will have the same threadnr.
2763 * @return always 0 currently, but code should handle a future improvement where when any call to func
2764 * returns < 0 no further calls to func may be done and < 0 is returned.
2765 * - encoding: Set by libavcodec, user can override.
2766 * - decoding: Set by libavcodec, user can override.
2767 */
2768 int (*execute2)(struct AVCodecContext *c, int (*func)(struct AVCodecContext *c2, void *arg, int jobnr, int threadnr), void *arg2, int *ret, int count);
2769
2770 /**
2771 * noise vs. sse weight for the nsse comparsion function
2772 * - encoding: Set by user.
2773 * - decoding: unused
2774 */
2775 int nsse_weight;
2776
2777 /**
2778 * profile
2779 * - encoding: Set by user.
2780 * - decoding: Set by libavcodec.
2781 */
2782 int profile;
2783 #define FF_PROFILE_UNKNOWN -99
2784 #define FF_PROFILE_RESERVED -100
2785
2786 #define FF_PROFILE_AAC_MAIN 0
2787 #define FF_PROFILE_AAC_LOW 1
2788 #define FF_PROFILE_AAC_SSR 2
2789 #define FF_PROFILE_AAC_LTP 3
2790 #define FF_PROFILE_AAC_HE 4
2791 #define FF_PROFILE_AAC_HE_V2 28
2792 #define FF_PROFILE_AAC_LD 22
2793 #define FF_PROFILE_AAC_ELD 38
2794 #define FF_PROFILE_MPEG2_AAC_LOW 128
2795 #define FF_PROFILE_MPEG2_AAC_HE 131
2796
2797 #define FF_PROFILE_DTS 20
2798 #define FF_PROFILE_DTS_ES 30
2799 #define FF_PROFILE_DTS_96_24 40
2800 #define FF_PROFILE_DTS_HD_HRA 50
2801 #define FF_PROFILE_DTS_HD_MA 60
2802 #define FF_PROFILE_DTS_EXPRESS 70
2803
2804 #define FF_PROFILE_MPEG2_422 0
2805 #define FF_PROFILE_MPEG2_HIGH 1
2806 #define FF_PROFILE_MPEG2_SS 2
2807 #define FF_PROFILE_MPEG2_SNR_SCALABLE 3
2808 #define FF_PROFILE_MPEG2_MAIN 4
2809 #define FF_PROFILE_MPEG2_SIMPLE 5
2810
2811 #define FF_PROFILE_H264_CONSTRAINED (1<<9) // 8+1; constraint_set1_flag
2812 #define FF_PROFILE_H264_INTRA (1<<11) // 8+3; constraint_set3_flag
2813
2814 #define FF_PROFILE_H264_BASELINE 66
2815 #define FF_PROFILE_H264_CONSTRAINED_BASELINE (66|FF_PROFILE_H264_CONSTRAINED)
2816 #define FF_PROFILE_H264_MAIN 77
2817 #define FF_PROFILE_H264_EXTENDED 88
2818 #define FF_PROFILE_H264_HIGH 100
2819 #define FF_PROFILE_H264_HIGH_10 110
2820 #define FF_PROFILE_H264_HIGH_10_INTRA (110|FF_PROFILE_H264_INTRA)
2821 #define FF_PROFILE_H264_HIGH_422 122
2822 #define FF_PROFILE_H264_HIGH_422_INTRA (122|FF_PROFILE_H264_INTRA)
2823 #define FF_PROFILE_H264_HIGH_444 144
2824 #define FF_PROFILE_H264_HIGH_444_PREDICTIVE 244
2825 #define FF_PROFILE_H264_HIGH_444_INTRA (244|FF_PROFILE_H264_INTRA)
2826 #define FF_PROFILE_H264_CAVLC_444 44
2827
2828 #define FF_PROFILE_VC1_SIMPLE 0
2829 #define FF_PROFILE_VC1_MAIN 1
2830 #define FF_PROFILE_VC1_COMPLEX 2
2831 #define FF_PROFILE_VC1_ADVANCED 3
2832
2833 #define FF_PROFILE_MPEG4_SIMPLE 0
2834 #define FF_PROFILE_MPEG4_SIMPLE_SCALABLE 1
2835 #define FF_PROFILE_MPEG4_CORE 2
2836 #define FF_PROFILE_MPEG4_MAIN 3
2837 #define FF_PROFILE_MPEG4_N_BIT 4
2838 #define FF_PROFILE_MPEG4_SCALABLE_TEXTURE 5
2839 #define FF_PROFILE_MPEG4_SIMPLE_FACE_ANIMATION 6
2840 #define FF_PROFILE_MPEG4_BASIC_ANIMATED_TEXTURE 7
2841 #define FF_PROFILE_MPEG4_HYBRID 8
2842 #define FF_PROFILE_MPEG4_ADVANCED_REAL_TIME 9
2843 #define FF_PROFILE_MPEG4_CORE_SCALABLE 10
2844 #define FF_PROFILE_MPEG4_ADVANCED_CODING 11
2845 #define FF_PROFILE_MPEG4_ADVANCED_CORE 12
2846 #define FF_PROFILE_MPEG4_ADVANCED_SCALABLE_TEXTURE 13
2847 #define FF_PROFILE_MPEG4_SIMPLE_STUDIO 14
2848 #define FF_PROFILE_MPEG4_ADVANCED_SIMPLE 15
2849
2850 #define FF_PROFILE_JPEG2000_CSTREAM_RESTRICTION_0 0
2851 #define FF_PROFILE_JPEG2000_CSTREAM_RESTRICTION_1 1
2852 #define FF_PROFILE_JPEG2000_CSTREAM_NO_RESTRICTION 2
2853 #define FF_PROFILE_JPEG2000_DCINEMA_2K 3
2854 #define FF_PROFILE_JPEG2000_DCINEMA_4K 4
2855
2856 #define FF_PROFILE_VP9_0 0
2857 #define FF_PROFILE_VP9_1 1
2858 #define FF_PROFILE_VP9_2 2
2859 #define FF_PROFILE_VP9_3 3
2860
2861 #define FF_PROFILE_HEVC_MAIN 1
2862 #define FF_PROFILE_HEVC_MAIN_10 2
2863 #define FF_PROFILE_HEVC_MAIN_STILL_PICTURE 3
2864
2865 /**
2866 * level
2867 * - encoding: Set by user.
2868 * - decoding: Set by libavcodec.
2869 */
2870 int level;
2871 #define FF_LEVEL_UNKNOWN -99
2872
2873 /**
2874 *
2875 * - encoding: unused
2876 * - decoding: Set by user.
2877 */
2878 enum AVDiscard skip_loop_filter;
2879
2880 /**
2881 *
2882 * - encoding: unused
2883 * - decoding: Set by user.
2884 */
2885 enum AVDiscard skip_idct;
2886
2887 /**
2888 *
2889 * - encoding: unused
2890 * - decoding: Set by user.
2891 */
2892 enum AVDiscard skip_frame;
2893
2894 /**
2895 * Header containing style information for text subtitles.
2896 * For SUBTITLE_ASS subtitle type, it should contain the whole ASS
2897 * [Script Info] and [V4+ Styles] section, plus the [Events] line and
2898 * the Format line following. It shouldn't include any Dialogue line.
2899 * - encoding: Set/allocated/freed by user (before avcodec_open2())
2900 * - decoding: Set/allocated/freed by libavcodec (by avcodec_open2())
2901 */
2902 uint8_t *subtitle_header;
2903 int subtitle_header_size;
2904
2905 #if FF_API_ERROR_RATE
2906 /**
2907 * @deprecated use the 'error_rate' private AVOption of the mpegvideo
2908 * encoders
2909 */
2910 attribute_deprecated
2911 int error_rate;
2912 #endif
2913
2914 #if FF_API_VBV_DELAY
2915 /**
2916 * VBV delay coded in the last frame (in periods of a 27 MHz clock).
2917 * Used for compliant TS muxing.
2918 * - encoding: Set by libavcodec.
2919 * - decoding: unused.
2920 * @deprecated this value is now exported as a part of
2921 * AV_PKT_DATA_CPB_PROPERTIES packet side data
2922 */
2923 attribute_deprecated
2924 uint64_t vbv_delay;
2925 #endif
2926
2927 #if FF_API_SIDEDATA_ONLY_PKT
2928 /**
2929 * Encoding only and set by default. Allow encoders to output packets
2930 * that do not contain any encoded data, only side data.
2931 *
2932 * Some encoders need to output such packets, e.g. to update some stream
2933 * parameters at the end of encoding.
2934 *
2935 * @deprecated this field disables the default behaviour and
2936 * it is kept only for compatibility.
2937 */
2938 attribute_deprecated
2939 int side_data_only_packets;
2940 #endif
2941
2942 /**
2943 * Audio only. The number of "priming" samples (padding) inserted by the
2944 * encoder at the beginning of the audio. I.e. this number of leading
2945 * decoded samples must be discarded by the caller to get the original audio
2946 * without leading padding.
2947 *
2948 * - decoding: unused
2949 * - encoding: Set by libavcodec. The timestamps on the output packets are
2950 * adjusted by the encoder so that they always refer to the
2951 * first sample of the data actually contained in the packet,
2952 * including any added padding. E.g. if the timebase is
2953 * 1/samplerate and the timestamp of the first input sample is
2954 * 0, the timestamp of the first output packet will be
2955 * -initial_padding.
2956 */
2957 int initial_padding;
2958
2959 /*
2960 * - decoding: For codecs that store a framerate value in the compressed
2961 * bitstream, the decoder may export it here. { 0, 1} when
2962 * unknown.
2963 * - encoding: unused
2964 */
2965 AVRational framerate;
2966
2967 /**
2968 * Nominal unaccelerated pixel format, see AV_PIX_FMT_xxx.
2969 * - encoding: unused.
2970 * - decoding: Set by libavcodec before calling get_format()
2971 */
2972 enum AVPixelFormat sw_pix_fmt;
2973
2974 /**
2975 * Additional data associated with the entire coded stream.
2976 *
2977 * - decoding: unused
2978 * - encoding: may be set by libavcodec after avcodec_open2().
2979 */
2980 AVPacketSideData *coded_side_data;
2981 int nb_coded_side_data;
2982
2983 } AVCodecContext;
2984
2985 /**
2986 * AVProfile.
2987 */
2988 typedef struct AVProfile {
2989 int profile;
2990 const char *name; ///< short name for the profile
2991 } AVProfile;
2992
2993 typedef struct AVCodecDefault AVCodecDefault;
2994
2995 struct AVSubtitle;
2996
2997 /**
2998 * AVCodec.
2999 */
3000 typedef struct AVCodec {
3001 /**
3002 * Name of the codec implementation.
3003 * The name is globally unique among encoders and among decoders (but an
3004 * encoder and a decoder can share the same name).
3005 * This is the primary way to find a codec from the user perspective.
3006 */
3007 const char *name;
3008 /**
3009 * Descriptive name for the codec, meant to be more human readable than name.
3010 * You should use the NULL_IF_CONFIG_SMALL() macro to define it.
3011 */
3012 const char *long_name;
3013 enum AVMediaType type;
3014 enum AVCodecID id;
3015 /**
3016 * Codec capabilities.
3017 * see AV_CODEC_CAP_*
3018 */
3019 int capabilities;
3020 const AVRational *supported_framerates; ///< array of supported framerates, or NULL if any, array is terminated by {0,0}
3021 const enum AVPixelFormat *pix_fmts; ///< array of supported pixel formats, or NULL if unknown, array is terminated by -1
3022 const int *supported_samplerates; ///< array of supported audio samplerates, or NULL if unknown, array is terminated by 0
3023 const enum AVSampleFormat *sample_fmts; ///< array of supported sample formats, or NULL if unknown, array is terminated by -1
3024 const uint64_t *channel_layouts; ///< array of support channel layouts, or NULL if unknown. array is terminated by 0
3025 #if FF_API_LOWRES
3026 attribute_deprecated uint8_t max_lowres; ///< maximum value for lowres supported by the decoder
3027 #endif
3028 const AVClass *priv_class; ///< AVClass for the private context
3029 const AVProfile *profiles; ///< array of recognized profiles, or NULL if unknown, array is terminated by {FF_PROFILE_UNKNOWN}
3030
3031 /*****************************************************************
3032 * No fields below this line are part of the public API. They
3033 * may not be used outside of libavcodec and can be changed and
3034 * removed at will.
3035 * New public fields should be added right above.
3036 *****************************************************************
3037 */
3038 int priv_data_size;
3039 struct AVCodec *next;
3040 /**
3041 * @name Frame-level threading support functions
3042 * @{
3043 */
3044 /**
3045 * If defined, called on thread contexts when they are created.
3046 * If the codec allocates writable tables in init(), re-allocate them here.
3047 * priv_data will be set to a copy of the original.
3048 */
3049 int (*init_thread_copy)(AVCodecContext *);
3050 /**
3051 * Copy necessary context variables from a previous thread context to the current one.
3052 * If not defined, the next thread will start automatically; otherwise, the codec
3053 * must call ff_thread_finish_setup().
3054 *
3055 * dst and src will (rarely) point to the same context, in which case memcpy should be skipped.
3056 */
3057 int (*update_thread_context)(AVCodecContext *dst, const AVCodecContext *src);
3058 /** @} */
3059
3060 /**
3061 * Private codec-specific defaults.
3062 */
3063 const AVCodecDefault *defaults;
3064
3065 /**
3066 * Initialize codec static data, called from avcodec_register().
3067 */
3068 void (*init_static_data)(struct AVCodec *codec);
3069
3070 int (*init)(AVCodecContext *);
3071 int (*encode_sub)(AVCodecContext *, uint8_t *buf, int buf_size,
3072 const struct AVSubtitle *sub);
3073 /**
3074 * Encode data to an AVPacket.
3075 *
3076 * @param avctx codec context
3077 * @param avpkt output AVPacket (may contain a user-provided buffer)
3078 * @param[in] frame AVFrame containing the raw data to be encoded
3079 * @param[out] got_packet_ptr encoder sets to 0 or 1 to indicate that a
3080 * non-empty packet was returned in avpkt.
3081 * @return 0 on success, negative error code on failure
3082 */
3083 int (*encode2)(AVCodecContext *avctx, AVPacket *avpkt, const AVFrame *frame,
3084 int *got_packet_ptr);
3085 int (*decode)(AVCodecContext *, void *outdata, int *outdata_size, AVPacket *avpkt);
3086 int (*close)(AVCodecContext *);
3087 /**
3088 * Flush buffers.
3089 * Will be called when seeking
3090 */
3091 void (*flush)(AVCodecContext *);
3092 /**
3093 * Internal codec capabilities.
3094 * See FF_CODEC_CAP_* in internal.h
3095 */
3096 int caps_internal;
3097 } AVCodec;
3098
3099 /**
3100 * @defgroup lavc_hwaccel AVHWAccel
3101 * @{
3102 */
3103 typedef struct AVHWAccel {
3104 /**
3105 * Name of the hardware accelerated codec.
3106 * The name is globally unique among encoders and among decoders (but an
3107 * encoder and a decoder can share the same name).
3108 */
3109 const char *name;
3110
3111 /**
3112 * Type of codec implemented by the hardware accelerator.
3113 *
3114 * See AVMEDIA_TYPE_xxx
3115 */
3116 enum AVMediaType type;
3117
3118 /**
3119 * Codec implemented by the hardware accelerator.
3120 *
3121 * See AV_CODEC_ID_xxx
3122 */
3123 enum AVCodecID id;
3124
3125 /**
3126 * Supported pixel format.
3127 *
3128 * Only hardware accelerated formats are supported here.
3129 */
3130 enum AVPixelFormat pix_fmt;
3131
3132 /**
3133 * Hardware accelerated codec capabilities.
3134 * see FF_HWACCEL_CODEC_CAP_*
3135 */
3136 int capabilities;
3137
3138 /*****************************************************************
3139 * No fields below this line are part of the public API. They
3140 * may not be used outside of libavcodec and can be changed and
3141 * removed at will.
3142 * New public fields should be added right above.
3143 *****************************************************************
3144 */
3145 struct AVHWAccel *next;
3146
3147 /**
3148 * Allocate a custom buffer
3149 */
3150 int (*alloc_frame)(AVCodecContext *avctx, AVFrame *frame);
3151
3152 /**
3153 * Called at the beginning of each frame or field picture.
3154 *
3155 * Meaningful frame information (codec specific) is guaranteed to
3156 * be parsed at this point. This function is mandatory.
3157 *
3158 * Note that buf can be NULL along with buf_size set to 0.
3159 * Otherwise, this means the whole frame is available at this point.
3160 *
3161 * @param avctx the codec context
3162 * @param buf the frame data buffer base
3163 * @param buf_size the size of the frame in bytes
3164 * @return zero if successful, a negative value otherwise
3165 */
3166 int (*start_frame)(AVCodecContext *avctx, const uint8_t *buf, uint32_t buf_size);
3167
3168 /**
3169 * Callback for each slice.
3170 *
3171 * Meaningful slice information (codec specific) is guaranteed to
3172 * be parsed at this point. This function is mandatory.
3173 *
3174 * @param avctx the codec context
3175 * @param buf the slice data buffer base
3176 * @param buf_size the size of the slice in bytes
3177 * @return zero if successful, a negative value otherwise
3178 */
3179 int (*decode_slice)(AVCodecContext *avctx, const uint8_t *buf, uint32_t buf_size);
3180
3181 /**
3182 * Called at the end of each frame or field picture.
3183 *
3184 * The whole picture is parsed at this point and can now be sent
3185 * to the hardware accelerator. This function is mandatory.
3186 *
3187 * @param avctx the codec context
3188 * @return zero if successful, a negative value otherwise
3189 */
3190 int (*end_frame)(AVCodecContext *avctx);
3191
3192 /**
3193 * Size of per-frame hardware accelerator private data.
3194 *
3195 * Private data is allocated with av_mallocz() before
3196 * AVCodecContext.get_buffer() and deallocated after
3197 * AVCodecContext.release_buffer().
3198 */
3199 int frame_priv_data_size;
3200
3201 /**
3202 * Initialize the hwaccel private data.
3203 *
3204 * This will be called from ff_get_format(), after hwaccel and
3205 * hwaccel_context are set and the hwaccel private data in AVCodecInternal
3206 * is allocated.
3207 */
3208 int (*init)(AVCodecContext *avctx);
3209
3210 /**
3211 * Uninitialize the hwaccel private data.
3212 *
3213 * This will be called from get_format() or avcodec_close(), after hwaccel
3214 * and hwaccel_context are already uninitialized.
3215 */
3216 int (*uninit)(AVCodecContext *avctx);
3217
3218 /**
3219 * Size of the private data to allocate in
3220 * AVCodecInternal.hwaccel_priv_data.
3221 */
3222 int priv_data_size;
3223 } AVHWAccel;
3224
3225 /**
3226 * Hardware acceleration should be used for decoding even if the codec level
3227 * used is unknown or higher than the maximum supported level reported by the
3228 * hardware driver.
3229 */
3230 #define AV_HWACCEL_FLAG_IGNORE_LEVEL (1 << 0)
3231
3232 /**
3233 * Hardware acceleration can output YUV pixel formats with a different chroma
3234 * sampling than 4:2:0 and/or other than 8 bits per component.
3235 */
3236 #define AV_HWACCEL_FLAG_ALLOW_HIGH_DEPTH (1 << 1)
3237
3238 /**
3239 * @}
3240 */
3241
3242 #if FF_API_AVPICTURE
3243 /**
3244 * @defgroup lavc_picture AVPicture
3245 *
3246 * Functions for working with AVPicture
3247 * @{
3248 */
3249
3250 /**
3251 * four components are given, that's all.
3252 * the last component is alpha
3253 * @deprecated Use the imgutils functions
3254 */
3255 typedef struct AVPicture {
3256 attribute_deprecated
3257 uint8_t *data[AV_NUM_DATA_POINTERS];
3258 attribute_deprecated
3259 int linesize[AV_NUM_DATA_POINTERS]; ///< number of bytes per line
3260 } AVPicture;
3261
3262 /**
3263 * @}
3264 */
3265 #endif
3266
3267 #define AVPALETTE_SIZE 1024
3268 #define AVPALETTE_COUNT 256
3269
3270 enum AVSubtitleType {
3271 SUBTITLE_NONE,
3272
3273 SUBTITLE_BITMAP, ///< A bitmap, pict will be set
3274
3275 /**
3276 * Plain text, the text field must be set by the decoder and is
3277 * authoritative. ass and pict fields may contain approximations.
3278 */
3279 SUBTITLE_TEXT,
3280
3281 /**
3282 * Formatted text, the ass field must be set by the decoder and is
3283 * authoritative. pict and text fields may contain approximations.
3284 */
3285 SUBTITLE_ASS,
3286 };
3287
3288 #define AV_SUBTITLE_FLAG_FORCED 0x00000001
3289
3290 typedef struct AVSubtitleRect {
3291 int x; ///< top left corner of pict, undefined when pict is not set
3292 int y; ///< top left corner of pict, undefined when pict is not set
3293 int w; ///< width of pict, undefined when pict is not set
3294 int h; ///< height of pict, undefined when pict is not set
3295 int nb_colors; ///< number of colors in pict, undefined when pict is not set
3296
3297 #if FF_API_AVPICTURE
3298 /**
3299 * @deprecated unused
3300 */
3301 attribute_deprecated
3302 AVPicture pict;
3303 #endif
3304 /**
3305 * data+linesize for the bitmap of this subtitle.
3306 * Can be set for text/ass as well once they are rendered.
3307 */
3308 uint8_t *data[4];
3309 int linesize[4];
3310
3311 enum AVSubtitleType type;
3312
3313 char *text; ///< 0 terminated plain UTF-8 text
3314
3315 /**
3316 * 0 terminated ASS/SSA compatible event line.
3317 * The pressentation of this is unaffected by the other values in this
3318 * struct.
3319 */
3320 char *ass;
3321 int flags;
3322 } AVSubtitleRect;
3323
3324 typedef struct AVSubtitle {
3325 uint16_t format; /* 0 = graphics */
3326 uint32_t start_display_time; /* relative to packet pts, in ms */
3327 uint32_t end_display_time; /* relative to packet pts, in ms */
3328 unsigned num_rects;
3329 AVSubtitleRect **rects;
3330 int64_t pts; ///< Same as packet pts, in AV_TIME_BASE
3331 } AVSubtitle;
3332
3333 /**
3334 * If c is NULL, returns the first registered codec,
3335 * if c is non-NULL, returns the next registered codec after c,
3336 * or NULL if c is the last one.
3337 */
3338 AVCodec *av_codec_next(const AVCodec *c);
3339
3340 /**
3341 * Return the LIBAVCODEC_VERSION_INT constant.
3342 */
3343 unsigned avcodec_version(void);
3344
3345 /**
3346 * Return the libavcodec build-time configuration.
3347 */
3348 const char *avcodec_configuration(void);
3349
3350 /**
3351 * Return the libavcodec license.
3352 */
3353 const char *avcodec_license(void);
3354
3355 /**
3356 * Register the codec codec and initialize libavcodec.
3357 *
3358 * @warning either this function or avcodec_register_all() must be called
3359 * before any other libavcodec functions.
3360 *
3361 * @see avcodec_register_all()
3362 */
3363 void avcodec_register(AVCodec *codec);
3364
3365 /**
3366 * Register all the codecs, parsers and bitstream filters which were enabled at
3367 * configuration time. If you do not call this function you can select exactly
3368 * which formats you want to support, by using the individual registration
3369 * functions.
3370 *
3371 * @see avcodec_register
3372 * @see av_register_codec_parser
3373 * @see av_register_bitstream_filter
3374 */
3375 void avcodec_register_all(void);
3376
3377 /**
3378 * Allocate an AVCodecContext and set its fields to default values. The
3379 * resulting struct should be freed with avcodec_free_context().
3380 *
3381 * @param codec if non-NULL, allocate private data and initialize defaults
3382 * for the given codec. It is illegal to then call avcodec_open2()
3383 * with a different codec.
3384 * If NULL, then the codec-specific defaults won't be initialized,
3385 * which may result in suboptimal default settings (this is
3386 * important mainly for encoders, e.g. libx264).
3387 *
3388 * @return An AVCodecContext filled with default values or NULL on failure.
3389 * @see avcodec_get_context_defaults
3390 */
3391 AVCodecContext *avcodec_alloc_context3(const AVCodec *codec);
3392
3393 /**
3394 * Free the codec context and everything associated with it and write NULL to
3395 * the provided pointer.
3396 */
3397 void avcodec_free_context(AVCodecContext **avctx);
3398
3399 /**
3400 * Set the fields of the given AVCodecContext to default values corresponding
3401 * to the given codec (defaults may be codec-dependent).
3402 *
3403 * Do not call this function if a non-NULL codec has been passed
3404 * to avcodec_alloc_context3() that allocated this AVCodecContext.
3405 * If codec is non-NULL, it is illegal to call avcodec_open2() with a
3406 * different codec on this AVCodecContext.
3407 */
3408 int avcodec_get_context_defaults3(AVCodecContext *s, const AVCodec *codec);
3409
3410 /**
3411 * Get the AVClass for AVCodecContext. It can be used in combination with
3412 * AV_OPT_SEARCH_FAKE_OBJ for examining options.
3413 *
3414 * @see av_opt_find().
3415 */
3416 const AVClass *avcodec_get_class(void);
3417
3418 /**
3419 * Copy the settings of the source AVCodecContext into the destination
3420 * AVCodecContext. The resulting destination codec context will be
3421 * unopened, i.e. you are required to call avcodec_open2() before you
3422 * can use this AVCodecContext to decode/encode video/audio data.
3423 *
3424 * @param dest target codec context, should be initialized with
3425 * avcodec_alloc_context3(), but otherwise uninitialized
3426 * @param src source codec context
3427 * @return AVERROR() on error (e.g. memory allocation error), 0 on success
3428 */
3429 int avcodec_copy_context(AVCodecContext *dest, const AVCodecContext *src);
3430
3431 /**
3432 * Initialize the AVCodecContext to use the given AVCodec. Prior to using this
3433 * function the context has to be allocated with avcodec_alloc_context3().
3434 *
3435 * The functions avcodec_find_decoder_by_name(), avcodec_find_encoder_by_name(),
3436 * avcodec_find_decoder() and avcodec_find_encoder() provide an easy way for
3437 * retrieving a codec.
3438 *
3439 * @warning This function is not thread safe!
3440 *
3441 * @note Always call this function before using decoding routines (such as
3442 * @ref avcodec_decode_video2()).
3443 *
3444 * @code
3445 * avcodec_register_all();
3446 * av_dict_set(&opts, "b", "2.5M", 0);
3447 * codec = avcodec_find_decoder(AV_CODEC_ID_H264);
3448 * if (!codec)
3449 * exit(1);
3450 *
3451 * context = avcodec_alloc_context3(codec);
3452 *
3453 * if (avcodec_open2(context, codec, opts) < 0)
3454 * exit(1);
3455 * @endcode
3456 *
3457 * @param avctx The context to initialize.
3458 * @param codec The codec to open this context for. If a non-NULL codec has been
3459 * previously passed to avcodec_alloc_context3() or
3460 * avcodec_get_context_defaults3() for this context, then this
3461 * parameter MUST be either NULL or equal to the previously passed
3462 * codec.
3463 * @param options A dictionary filled with AVCodecContext and codec-private options.
3464 * On return this object will be filled with options that were not found.
3465 *
3466 * @return zero on success, a negative value on error
3467 * @see avcodec_alloc_context3(), avcodec_find_decoder(), avcodec_find_encoder(),
3468 * av_dict_set(), av_opt_find().
3469 */
3470 int avcodec_open2(AVCodecContext *avctx, const AVCodec *codec, AVDictionary **options);
3471
3472 /**
3473 * Close a given AVCodecContext and free all the data associated with it
3474 * (but not the AVCodecContext itself).
3475 *
3476 * Calling this function on an AVCodecContext that hasn't been opened will free
3477 * the codec-specific data allocated in avcodec_alloc_context3() /
3478 * avcodec_get_context_defaults3() with a non-NULL codec. Subsequent calls will
3479 * do nothing.
3480 */
3481 int avcodec_close(AVCodecContext *avctx);
3482
3483 /**
3484 * Free all allocated data in the given subtitle struct.
3485 *
3486 * @param sub AVSubtitle to free.
3487 */
3488 void avsubtitle_free(AVSubtitle *sub);
3489
3490 /**
3491 * @}
3492 */
3493
3494 /**
3495 * @addtogroup lavc_packet
3496 * @{
3497 */
3498
3499 /**
3500 * Allocate an AVPacket and set its fields to default values. The resulting
3501 * struct must be freed using av_packet_free().
3502 *
3503 * @return An AVPacket filled with default values or NULL on failure.
3504 *
3505 * @note this only allocates the AVPacket itself, not the data buffers. Those
3506 * must be allocated through other means such as av_new_packet.
3507 *
3508 * @see av_new_packet
3509 */
3510 AVPacket *av_packet_alloc(void);
3511
3512 /**
3513 * Create a new packet that references the same data as src.
3514 *
3515 * This is a shortcut for av_packet_alloc()+av_packet_ref().
3516 *
3517 * @return newly created AVPacket on success, NULL on error.
3518 *
3519 * @see av_packet_alloc
3520 * @see av_packet_ref
3521 */
3522 AVPacket *av_packet_clone(AVPacket *src);
3523
3524 /**
3525 * Free the packet, if the packet is reference counted, it will be
3526 * unreferenced first.
3527 *
3528 * @param packet packet to be freed. The pointer will be set to NULL.
3529 * @note passing NULL is a no-op.
3530 */
3531 void av_packet_free(AVPacket **pkt);
3532
3533 /**
3534 * Initialize optional fields of a packet with default values.
3535 *
3536 * Note, this does not touch the data and size members, which have to be
3537 * initialized separately.
3538 *
3539 * @param pkt packet
3540 */
3541 void av_init_packet(AVPacket *pkt);
3542
3543 /**
3544 * Allocate the payload of a packet and initialize its fields with
3545 * default values.
3546 *
3547 * @param pkt packet
3548 * @param size wanted payload size
3549 * @return 0 if OK, AVERROR_xxx otherwise
3550 */
3551 int av_new_packet(AVPacket *pkt, int size);
3552
3553 /**
3554 * Reduce packet size, correctly zeroing padding
3555 *
3556 * @param pkt packet
3557 * @param size new size
3558 */
3559 void av_shrink_packet(AVPacket *pkt, int size);
3560
3561 /**
3562 * Increase packet size, correctly zeroing padding
3563 *
3564 * @param pkt packet
3565 * @param grow_by number of bytes by which to increase the size of the packet
3566 */
3567 int av_grow_packet(AVPacket *pkt, int grow_by);
3568
3569 /**
3570 * Initialize a reference-counted packet from av_malloc()ed data.
3571 *
3572 * @param pkt packet to be initialized. This function will set the data, size,
3573 * buf and destruct fields, all others are left untouched.
3574 * @param data Data allocated by av_malloc() to be used as packet data. If this
3575 * function returns successfully, the data is owned by the underlying AVBuffer.
3576 * The caller may not access the data through other means.
3577 * @param size size of data in bytes, without the padding. I.e. the full buffer
3578 * size is assumed to be size + AV_INPUT_BUFFER_PADDING_SIZE.
3579 *
3580 * @return 0 on success, a negative AVERROR on error
3581 */
3582 int av_packet_from_data(AVPacket *pkt, uint8_t *data, int size);
3583
3584 #if FF_API_AVPACKET_OLD_API
3585 /**
3586 * @warning This is a hack - the packet memory allocation stuff is broken. The
3587 * packet is allocated if it was not really allocated.
3588 *
3589 * @deprecated Use av_packet_ref
3590 */
3591 attribute_deprecated
3592 int av_dup_packet(AVPacket *pkt);
3593 /**
3594 * Free a packet.
3595 *
3596 * @deprecated Use av_packet_unref
3597 *
3598 * @param pkt packet to free
3599 */
3600 attribute_deprecated
3601 void av_free_packet(AVPacket *pkt);
3602 #endif
3603 /**
3604 * Allocate new information of a packet.
3605 *
3606 * @param pkt packet
3607 * @param type side information type
3608 * @param size side information size
3609 * @return pointer to fresh allocated data or NULL otherwise
3610 */
3611 uint8_t* av_packet_new_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
3612 int size);
3613
3614 /**
3615 * Wrap an existing array as a packet side data.
3616 *
3617 * @param pkt packet
3618 * @param type side information type
3619 * @param data the side data array. It must be allocated with the av_malloc()
3620 * family of functions. The ownership of the data is transferred to
3621 * pkt.
3622 * @param size side information size
3623 * @return a non-negative number on success, a negative AVERROR code on
3624 * failure. On failure, the packet is unchanged and the data remains
3625 * owned by the caller.
3626 */
3627 int av_packet_add_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
3628 uint8_t *data, size_t size);
3629
3630 /**
3631 * Shrink the already allocated side data buffer
3632 *
3633 * @param pkt packet
3634 * @param type side information type
3635 * @param size new side information size
3636 * @return 0 on success, < 0 on failure
3637 */
3638 int av_packet_shrink_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
3639 int size);
3640
3641 /**
3642 * Get side information from packet.
3643 *
3644 * @param pkt packet
3645 * @param type desired side information type
3646 * @param size pointer for side information size to store (optional)
3647 * @return pointer to data if present or NULL otherwise
3648 */
3649 uint8_t* av_packet_get_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
3650 int *size);
3651
3652 /**
3653 * Convenience function to free all the side data stored.
3654 * All the other fields stay untouched.
3655 *
3656 * @param pkt packet
3657 */
3658 void av_packet_free_side_data(AVPacket *pkt);
3659
3660 /**
3661 * Setup a new reference to the data described by a given packet
3662 *
3663 * If src is reference-counted, setup dst as a new reference to the
3664 * buffer in src. Otherwise allocate a new buffer in dst and copy the
3665 * data from src into it.
3666 *
3667 * All the other fields are copied from src.
3668 *
3669 * @see av_packet_unref
3670 *
3671 * @param dst Destination packet
3672 * @param src Source packet
3673 *
3674 * @return 0 on success, a negative AVERROR on error.
3675 */
3676 int av_packet_ref(AVPacket *dst, AVPacket *src);
3677
3678 /**
3679 * Wipe the packet.
3680 *
3681 * Unreference the buffer referenced by the packet and reset the
3682 * remaining packet fields to their default values.
3683 *
3684 * @param pkt The packet to be unreferenced.
3685 */
3686 void av_packet_unref(AVPacket *pkt);
3687
3688 /**
3689 * Move every field in src to dst and reset src.
3690 *
3691 * @see av_packet_unref
3692 *
3693 * @param src Source packet, will be reset
3694 * @param dst Destination packet
3695 */
3696 void av_packet_move_ref(AVPacket *dst, AVPacket *src);
3697
3698 /**
3699 * Copy only "properties" fields from src to dst.
3700 *
3701 * Properties for the purpose of this function are all the fields
3702 * beside those related to the packet data (buf, data, size)
3703 *
3704 * @param dst Destination packet
3705 * @param src Source packet
3706 *
3707 * @return 0 on success AVERROR on failure.
3708 *
3709 */
3710 int av_packet_copy_props(AVPacket *dst, const AVPacket *src);
3711
3712 /**
3713 * Convert valid timing fields (timestamps / durations) in a packet from one
3714 * timebase to another. Timestamps with unknown values (AV_NOPTS_VALUE) will be
3715 * ignored.
3716 *
3717 * @param pkt packet on which the conversion will be performed
3718 * @param tb_src source timebase, in which the timing fields in pkt are
3719 * expressed
3720 * @param tb_dst destination timebase, to which the timing fields will be
3721 * converted
3722 */
3723 void av_packet_rescale_ts(AVPacket *pkt, AVRational tb_src, AVRational tb_dst);
3724
3725 /**
3726 * @}
3727 */
3728
3729 /**
3730 * @addtogroup lavc_decoding
3731 * @{
3732 */
3733
3734 /**
3735 * Find a registered decoder with a matching codec ID.
3736 *
3737 * @param id AVCodecID of the requested decoder
3738 * @return A decoder if one was found, NULL otherwise.
3739 */
3740 AVCodec *avcodec_find_decoder(enum AVCodecID id);
3741
3742 /**
3743 * Find a registered decoder with the specified name.
3744 *
3745 * @param name name of the requested decoder
3746 * @return A decoder if one was found, NULL otherwise.
3747 */
3748 AVCodec *avcodec_find_decoder_by_name(const char *name);
3749
3750 /**
3751 * The default callback for AVCodecContext.get_buffer2(). It is made public so
3752 * it can be called by custom get_buffer2() implementations for decoders without
3753 * AV_CODEC_CAP_DR1 set.
3754 */
3755 int avcodec_default_get_buffer2(AVCodecContext *s, AVFrame *frame, int flags);
3756
3757 #if FF_API_EMU_EDGE
3758 /**
3759 * Return the amount of padding in pixels which the get_buffer callback must
3760 * provide around the edge of the image for codecs which do not have the
3761 * CODEC_FLAG_EMU_EDGE flag.
3762 *
3763 * @return Required padding in pixels.
3764 *
3765 * @deprecated CODEC_FLAG_EMU_EDGE is deprecated, so this function is no longer
3766 * needed
3767 */
3768 attribute_deprecated
3769 unsigned avcodec_get_edge_width(void);
3770 #endif
3771
3772 /**
3773 * Modify width and height values so that they will result in a memory
3774 * buffer that is acceptable for the codec if you do not use any horizontal
3775 * padding.
3776 *
3777 * May only be used if a codec with AV_CODEC_CAP_DR1 has been opened.
3778 */
3779 void avcodec_align_dimensions(AVCodecContext *s, int *width, int *height);
3780
3781 /**
3782 * Modify width and height values so that they will result in a memory
3783 * buffer that is acceptable for the codec if you also ensure that all
3784 * line sizes are a multiple of the respective linesize_align[i].
3785 *
3786 * May only be used if a codec with AV_CODEC_CAP_DR1 has been opened.
3787 */
3788 void avcodec_align_dimensions2(AVCodecContext *s, int *width, int *height,
3789 int linesize_align[AV_NUM_DATA_POINTERS]);
3790
3791 /**
3792 * Decode the audio frame of size avpkt->size from avpkt->data into frame.
3793 *
3794 * Some decoders may support multiple frames in a single AVPacket. Such
3795 * decoders would then just decode the first frame and the return value would be
3796 * less than the packet size. In this case, avcodec_decode_audio4 has to be
3797 * called again with an AVPacket containing the remaining data in order to
3798 * decode the second frame, etc... Even if no frames are returned, the packet
3799 * needs to be fed to the decoder with remaining data until it is completely
3800 * consumed or an error occurs.
3801 *
3802 * Some decoders (those marked with AV_CODEC_CAP_DELAY) have a delay between input
3803 * and output. This means that for some packets they will not immediately
3804 * produce decoded output and need to be flushed at the end of decoding to get
3805 * all the decoded data. Flushing is done by calling this function with packets
3806 * with avpkt->data set to NULL and avpkt->size set to 0 until it stops
3807 * returning samples. It is safe to flush even those decoders that are not
3808 * marked with AV_CODEC_CAP_DELAY, then no samples will be returned.
3809 *
3810 * @warning The input buffer, avpkt->data must be AV_INPUT_BUFFER_PADDING_SIZE
3811 * larger than the actual read bytes because some optimized bitstream
3812 * readers read 32 or 64 bits at once and could read over the end.
3813 *
3814 * @note The AVCodecContext MUST have been opened with @ref avcodec_open2()
3815 * before packets may be fed to the decoder.
3816 *
3817 * @param avctx the codec context
3818 * @param[out] frame The AVFrame in which to store decoded audio samples.
3819 * The decoder will allocate a buffer for the decoded frame by
3820 * calling the AVCodecContext.get_buffer2() callback.
3821 * When AVCodecContext.refcounted_frames is set to 1, the frame is
3822 * reference counted and the returned reference belongs to the
3823 * caller. The caller must release the frame using av_frame_unref()
3824 * when the frame is no longer needed. The caller may safely write
3825 * to the frame if av_frame_is_writable() returns 1.
3826 * When AVCodecContext.refcounted_frames is set to 0, the returned
3827 * reference belongs to the decoder and is valid only until the
3828 * next call to this function or until closing or flushing the
3829 * decoder. The caller may not write to it.
3830 * @param[out] got_frame_ptr Zero if no frame could be decoded, otherwise it is
3831 * non-zero. Note that this field being set to zero
3832 * does not mean that an error has occurred. For
3833 * decoders with AV_CODEC_CAP_DELAY set, no given decode
3834 * call is guaranteed to produce a frame.
3835 * @param[in] avpkt The input AVPacket containing the input buffer.
3836 * At least avpkt->data and avpkt->size should be set. Some
3837 * decoders might also require additional fields to be set.
3838 * @return A negative error code is returned if an error occurred during
3839 * decoding, otherwise the number of bytes consumed from the input
3840 * AVPacket is returned.
3841 */
3842 int avcodec_decode_audio4(AVCodecContext *avctx, AVFrame *frame,
3843 int *got_frame_ptr, AVPacket *avpkt);
3844
3845 /**
3846 * Decode the video frame of size avpkt->size from avpkt->data into picture.
3847 * Some decoders may support multiple frames in a single AVPacket, such
3848 * decoders would then just decode the first frame.
3849 *
3850 * @warning The input buffer must be AV_INPUT_BUFFER_PADDING_SIZE larger than
3851 * the actual read bytes because some optimized bitstream readers read 32 or 64
3852 * bits at once and could read over the end.
3853 *
3854 * @warning The end of the input buffer buf should be set to 0 to ensure that
3855 * no overreading happens for damaged MPEG streams.
3856 *
3857 * @note Codecs which have the AV_CODEC_CAP_DELAY capability set have a delay
3858 * between input and output, these need to be fed with avpkt->data=NULL,
3859 * avpkt->size=0 at the end to return the remaining frames.
3860 *
3861 * @note The AVCodecContext MUST have been opened with @ref avcodec_open2()
3862 * before packets may be fed to the decoder.
3863 *
3864 * @param avctx the codec context
3865 * @param[out] picture The AVFrame in which the decoded video frame will be stored.
3866 * Use av_frame_alloc() to get an AVFrame. The codec will
3867 * allocate memory for the actual bitmap by calling the
3868 * AVCodecContext.get_buffer2() callback.
3869 * When AVCodecContext.refcounted_frames is set to 1, the frame is
3870 * reference counted and the returned reference belongs to the
3871 * caller. The caller must release the frame using av_frame_unref()
3872 * when the frame is no longer needed. The caller may safely write
3873 * to the frame if av_frame_is_writable() returns 1.
3874 * When AVCodecContext.refcounted_frames is set to 0, the returned
3875 * reference belongs to the decoder and is valid only until the
3876 * next call to this function or until closing or flushing the
3877 * decoder. The caller may not write to it.
3878 *
3879 * @param[in] avpkt The input AVpacket containing the input buffer.
3880 * You can create such packet with av_init_packet() and by then setting
3881 * data and size, some decoders might in addition need other fields like
3882 * flags&AV_PKT_FLAG_KEY. All decoders are designed to use the least
3883 * fields possible.
3884 * @param[in,out] got_picture_ptr Zero if no frame could be decompressed, otherwise, it is nonzero.
3885 * @return On error a negative value is returned, otherwise the number of bytes
3886 * used or zero if no frame could be decompressed.
3887 */
3888 int avcodec_decode_video2(AVCodecContext *avctx, AVFrame *picture,
3889 int *got_picture_ptr,
3890 AVPacket *avpkt);
3891
3892 /**
3893 * Decode a subtitle message.
3894 * Return a negative value on error, otherwise return the number of bytes used.
3895 * If no subtitle could be decompressed, got_sub_ptr is zero.
3896 * Otherwise, the subtitle is stored in *sub.
3897 * Note that AV_CODEC_CAP_DR1 is not available for subtitle codecs. This is for
3898 * simplicity, because the performance difference is expect to be negligible
3899 * and reusing a get_buffer written for video codecs would probably perform badly
3900 * due to a potentially very different allocation pattern.
3901 *
3902 * @note The AVCodecContext MUST have been opened with @ref avcodec_open2()
3903 * before packets may be fed to the decoder.
3904 *
3905 * @param avctx the codec context
3906 * @param[out] sub The AVSubtitle in which the decoded subtitle will be stored, must be
3907 freed with avsubtitle_free if *got_sub_ptr is set.
3908 * @param[in,out] got_sub_ptr Zero if no subtitle could be decompressed, otherwise, it is nonzero.
3909 * @param[in] avpkt The input AVPacket containing the input buffer.
3910 */
3911 int avcodec_decode_subtitle2(AVCodecContext *avctx, AVSubtitle *sub,
3912 int *got_sub_ptr,
3913 AVPacket *avpkt);
3914
3915 /**
3916 * @defgroup lavc_parsing Frame parsing
3917 * @{
3918 */
3919
3920 enum AVPictureStructure {
3921 AV_PICTURE_STRUCTURE_UNKNOWN, //< unknown
3922 AV_PICTURE_STRUCTURE_TOP_FIELD, //< coded as top field
3923 AV_PICTURE_STRUCTURE_BOTTOM_FIELD, //< coded as bottom field
3924 AV_PICTURE_STRUCTURE_FRAME, //< coded as frame
3925 };
3926
3927 typedef struct AVCodecParserContext {
3928 void *priv_data;
3929 struct AVCodecParser *parser;
3930 int64_t frame_offset; /* offset of the current frame */
3931 int64_t cur_offset; /* current offset
3932 (incremented by each av_parser_parse()) */
3933 int64_t next_frame_offset; /* offset of the next frame */
3934 /* video info */
3935 int pict_type; /* XXX: Put it back in AVCodecContext. */
3936 /**
3937 * This field is used for proper frame duration computation in lavf.
3938 * It signals, how much longer the frame duration of the current frame
3939 * is compared to normal frame duration.
3940 *
3941 * frame_duration = (1 + repeat_pict) * time_base
3942 *
3943 * It is used by codecs like H.264 to display telecined material.
3944 */
3945 int repeat_pict; /* XXX: Put it back in AVCodecContext. */
3946 int64_t pts; /* pts of the current frame */
3947 int64_t dts; /* dts of the current frame */
3948
3949 /* private data */
3950 int64_t last_pts;
3951 int64_t last_dts;
3952 int fetch_timestamp;
3953
3954 #define AV_PARSER_PTS_NB 4
3955 int cur_frame_start_index;
3956 int64_t cur_frame_offset[AV_PARSER_PTS_NB];
3957 int64_t cur_frame_pts[AV_PARSER_PTS_NB];
3958 int64_t cur_frame_dts[AV_PARSER_PTS_NB];
3959
3960 int flags;
3961 #define PARSER_FLAG_COMPLETE_FRAMES 0x0001
3962 #define PARSER_FLAG_ONCE 0x0002
3963 /// Set if the parser has a valid file offset
3964 #define PARSER_FLAG_FETCHED_OFFSET 0x0004
3965
3966 int64_t offset; ///< byte offset from starting packet start
3967 int64_t cur_frame_end[AV_PARSER_PTS_NB];
3968
3969 /**
3970 * Set by parser to 1 for key frames and 0 for non-key frames.
3971 * It is initialized to -1, so if the parser doesn't set this flag,
3972 * old-style fallback using AV_PICTURE_TYPE_I picture type as key frames
3973 * will be used.
3974 */
3975 int key_frame;
3976
3977 #if FF_API_CONVERGENCE_DURATION
3978 /**
3979 * @deprecated unused
3980 */
3981 attribute_deprecated
3982 int64_t convergence_duration;
3983 #endif
3984
3985 // Timestamp generation support:
3986 /**
3987 * Synchronization point for start of timestamp generation.
3988 *
3989 * Set to >0 for sync point, 0 for no sync point and <0 for undefined
3990 * (default).
3991 *
3992 * For example, this corresponds to presence of H.264 buffering period
3993 * SEI message.
3994 */
3995 int dts_sync_point;
3996
3997 /**
3998 * Offset of the current timestamp against last timestamp sync point in
3999 * units of AVCodecContext.time_base.
4000 *
4001 * Set to INT_MIN when dts_sync_point unused. Otherwise, it must
4002 * contain a valid timestamp offset.
4003 *
4004 * Note that the timestamp of sync point has usually a nonzero
4005 * dts_ref_dts_delta, which refers to the previous sync point. Offset of
4006 * the next frame after timestamp sync point will be usually 1.
4007 *
4008 * For example, this corresponds to H.264 cpb_removal_delay.
4009 */
4010 int dts_ref_dts_delta;
4011
4012 /**
4013 * Presentation delay of current frame in units of AVCodecContext.time_base.
4014 *
4015 * Set to INT_MIN when dts_sync_point unused. Otherwise, it must
4016 * contain valid non-negative timestamp delta (presentation time of a frame
4017 * must not lie in the past).
4018 *
4019 * This delay represents the difference between decoding and presentation
4020 * time of the frame.
4021 *
4022 * For example, this corresponds to H.264 dpb_output_delay.
4023 */
4024 int pts_dts_delta;
4025
4026 /**
4027 * Position of the packet in file.
4028 *
4029 * Analogous to cur_frame_pts/dts
4030 */
4031 int64_t cur_frame_pos[AV_PARSER_PTS_NB];
4032
4033 /**
4034 * Byte position of currently parsed frame in stream.
4035 */
4036 int64_t pos;
4037
4038 /**
4039 * Previous frame byte position.
4040 */
4041 int64_t last_pos;
4042
4043 /**
4044 * Duration of the current frame.
4045 * For audio, this is in units of 1 / AVCodecContext.sample_rate.
4046 * For all other types, this is in units of AVCodecContext.time_base.
4047 */
4048 int duration;
4049
4050 enum AVFieldOrder field_order;
4051
4052 /**
4053 * Indicate whether a picture is coded as a frame, top field or bottom field.
4054 *
4055 * For example, H.264 field_pic_flag equal to 0 corresponds to
4056 * AV_PICTURE_STRUCTURE_FRAME. An H.264 picture with field_pic_flag
4057 * equal to 1 and bottom_field_flag equal to 0 corresponds to
4058 * AV_PICTURE_STRUCTURE_TOP_FIELD.
4059 */
4060 enum AVPictureStructure picture_structure;
4061
4062 /**
4063 * Picture number incremented in presentation or output order.
4064 * This field may be reinitialized at the first picture of a new sequence.
4065 *
4066 * For example, this corresponds to H.264 PicOrderCnt.
4067 */
4068 int output_picture_number;
4069
4070 /**
4071 * Dimensions of the decoded video intended for presentation.
4072 */
4073 int width;
4074 int height;
4075
4076 /**
4077 * Dimensions of the coded video.
4078 */
4079 int coded_width;
4080 int coded_height;
4081
4082 /**
4083 * The format of the coded data, corresponds to enum AVPixelFormat for video
4084 * and for enum AVSampleFormat for audio.
4085 *
4086 * Note that a decoder can have considerable freedom in how exactly it
4087 * decodes the data, so the format reported here might be different from the
4088 * one returned by a decoder.
4089 */
4090 int format;
4091 } AVCodecParserContext;
4092
4093 typedef struct AVCodecParser {
4094 int codec_ids[5]; /* several codec IDs are permitted */
4095 int priv_data_size;
4096 int (*parser_init)(AVCodecParserContext *s);
4097 /* This callback never returns an error, a negative value means that
4098 * the frame start was in a previous packet. */
4099 int (*parser_parse)(AVCodecParserContext *s,
4100 AVCodecContext *avctx,
4101 const uint8_t **poutbuf, int *poutbuf_size,
4102 const uint8_t *buf, int buf_size);
4103 void (*parser_close)(AVCodecParserContext *s);
4104 int (*split)(AVCodecContext *avctx, const uint8_t *buf, int buf_size);
4105 struct AVCodecParser *next;
4106 } AVCodecParser;
4107
4108 AVCodecParser *av_parser_next(const AVCodecParser *c);
4109
4110 void av_register_codec_parser(AVCodecParser *parser);
4111 AVCodecParserContext *av_parser_init(int codec_id);
4112
4113 /**
4114 * Parse a packet.
4115 *
4116 * @param s parser context.
4117 * @param avctx codec context.
4118 * @param poutbuf set to pointer to parsed buffer or NULL if not yet finished.
4119 * @param poutbuf_size set to size of parsed buffer or zero if not yet finished.
4120 * @param buf input buffer.
4121 * @param buf_size input length, to signal EOF, this should be 0 (so that the last frame can be output).
4122 * @param pts input presentation timestamp.
4123 * @param dts input decoding timestamp.
4124 * @param pos input byte position in stream.
4125 * @return the number of bytes of the input bitstream used.
4126 *
4127 * Example:
4128 * @code
4129 * while(in_len){
4130 * len = av_parser_parse2(myparser, AVCodecContext, &data, &size,
4131 * in_data, in_len,
4132 * pts, dts, pos);
4133 * in_data += len;
4134 * in_len -= len;
4135 *
4136 * if(size)
4137 * decode_frame(data, size);
4138 * }
4139 * @endcode
4140 */
4141 int av_parser_parse2(AVCodecParserContext *s,
4142 AVCodecContext *avctx,
4143 uint8_t **poutbuf, int *poutbuf_size,
4144 const uint8_t *buf, int buf_size,
4145 int64_t pts, int64_t dts,
4146 int64_t pos);
4147
4148 /**
4149 * @return 0 if the output buffer is a subset of the input, 1 if it is allocated and must be freed
4150 * @deprecated use AVBitstreamFilter
4151 */
4152 int av_parser_change(AVCodecParserContext *s,
4153 AVCodecContext *avctx,
4154 uint8_t **poutbuf, int *poutbuf_size,
4155 const uint8_t *buf, int buf_size, int keyframe);
4156 void av_parser_close(AVCodecParserContext *s);
4157
4158 /**
4159 * @}
4160 * @}
4161 */
4162
4163 /**
4164 * @addtogroup lavc_encoding
4165 * @{
4166 */
4167
4168 /**
4169 * Find a registered encoder with a matching codec ID.
4170 *
4171 * @param id AVCodecID of the requested encoder
4172 * @return An encoder if one was found, NULL otherwise.
4173 */
4174 AVCodec *avcodec_find_encoder(enum AVCodecID id);
4175
4176 /**
4177 * Find a registered encoder with the specified name.
4178 *
4179 * @param name name of the requested encoder
4180 * @return An encoder if one was found, NULL otherwise.
4181 */
4182 AVCodec *avcodec_find_encoder_by_name(const char *name);
4183
4184 /**
4185 * Encode a frame of audio.
4186 *
4187 * Takes input samples from frame and writes the next output packet, if
4188 * available, to avpkt. The output packet does not necessarily contain data for
4189 * the most recent frame, as encoders can delay, split, and combine input frames
4190 * internally as needed.
4191 *
4192 * @param avctx codec context
4193 * @param avpkt output AVPacket.
4194 * The user can supply an output buffer by setting
4195 * avpkt->data and avpkt->size prior to calling the
4196 * function, but if the size of the user-provided data is not
4197 * large enough, encoding will fail. All other AVPacket fields
4198 * will be reset by the encoder using av_init_packet(). If
4199 * avpkt->data is NULL, the encoder will allocate it.
4200 * The encoder will set avpkt->size to the size of the
4201 * output packet.
4202 *
4203 * If this function fails or produces no output, avpkt will be
4204 * freed using av_packet_unref().
4205 * @param[in] frame AVFrame containing the raw audio data to be encoded.
4206 * May be NULL when flushing an encoder that has the
4207 * AV_CODEC_CAP_DELAY capability set.
4208 * If AV_CODEC_CAP_VARIABLE_FRAME_SIZE is set, then each frame
4209 * can have any number of samples.
4210 * If it is not set, frame->nb_samples must be equal to
4211 * avctx->frame_size for all frames except the last.
4212 * The final frame may be smaller than avctx->frame_size.
4213 * @param[out] got_packet_ptr This field is set to 1 by libavcodec if the
4214 * output packet is non-empty, and to 0 if it is
4215 * empty. If the function returns an error, the
4216 * packet can be assumed to be invalid, and the
4217 * value of got_packet_ptr is undefined and should
4218 * not be used.
4219 * @return 0 on success, negative error code on failure
4220 */
4221 int avcodec_encode_audio2(AVCodecContext *avctx, AVPacket *avpkt,
4222 const AVFrame *frame, int *got_packet_ptr);
4223
4224 /**
4225 * Encode a frame of video.
4226 *
4227 * Takes input raw video data from frame and writes the next output packet, if
4228 * available, to avpkt. The output packet does not necessarily contain data for
4229 * the most recent frame, as encoders can delay and reorder input frames
4230 * internally as needed.
4231 *
4232 * @param avctx codec context
4233 * @param avpkt output AVPacket.
4234 * The user can supply an output buffer by setting
4235 * avpkt->data and avpkt->size prior to calling the
4236 * function, but if the size of the user-provided data is not
4237 * large enough, encoding will fail. All other AVPacket fields
4238 * will be reset by the encoder using av_init_packet(). If
4239 * avpkt->data is NULL, the encoder will allocate it.
4240 * The encoder will set avpkt->size to the size of the
4241 * output packet. The returned data (if any) belongs to the
4242 * caller, he is responsible for freeing it.
4243 *
4244 * If this function fails or produces no output, avpkt will be
4245 * freed using av_packet_unref().
4246 * @param[in] frame AVFrame containing the raw video data to be encoded.
4247 * May be NULL when flushing an encoder that has the
4248 * AV_CODEC_CAP_DELAY capability set.
4249 * @param[out] got_packet_ptr This field is set to 1 by libavcodec if the
4250 * output packet is non-empty, and to 0 if it is
4251 * empty. If the function returns an error, the
4252 * packet can be assumed to be invalid, and the
4253 * value of got_packet_ptr is undefined and should
4254 * not be used.
4255 * @return 0 on success, negative error code on failure
4256 */
4257 int avcodec_encode_video2(AVCodecContext *avctx, AVPacket *avpkt,
4258 const AVFrame *frame, int *got_packet_ptr);
4259
4260 int avcodec_encode_subtitle(AVCodecContext *avctx, uint8_t *buf, int buf_size,
4261 const AVSubtitle *sub);
4262
4263
4264 /**
4265 * @}
4266 */
4267
4268 #if FF_API_AVPICTURE
4269 /**
4270 * @addtogroup lavc_picture
4271 * @{
4272 */
4273
4274 /**
4275 * @deprecated unused
4276 */
4277 attribute_deprecated
4278 int avpicture_alloc(AVPicture *picture, enum AVPixelFormat pix_fmt, int width, int height);
4279
4280 /**
4281 * @deprecated unused
4282 */
4283 attribute_deprecated
4284 void avpicture_free(AVPicture *picture);
4285
4286 /**
4287 * @deprecated use av_image_fill_arrays() instead.
4288 */
4289 attribute_deprecated
4290 int avpicture_fill(AVPicture *picture, uint8_t *ptr,
4291 enum AVPixelFormat pix_fmt, int width, int height);
4292
4293 /**
4294 * @deprecated use av_image_copy_to_buffer() instead.
4295 */
4296 attribute_deprecated
4297 int avpicture_layout(const AVPicture* src, enum AVPixelFormat pix_fmt,
4298 int width, int height,
4299 unsigned char *dest, int dest_size);
4300
4301 /**
4302 * @deprecated use av_image_get_buffer_size() instead.
4303 */
4304 attribute_deprecated
4305 int avpicture_get_size(enum AVPixelFormat pix_fmt, int width, int height);
4306
4307 /**
4308 * @deprecated av_image_copy() instead.
4309 */
4310 attribute_deprecated
4311 void av_picture_copy(AVPicture *dst, const AVPicture *src,
4312 enum AVPixelFormat pix_fmt, int width, int height);
4313
4314 /**
4315 * @deprecated unused
4316 */
4317 attribute_deprecated
4318 int av_picture_crop(AVPicture *dst, const AVPicture *src,
4319 enum AVPixelFormat pix_fmt, int top_band, int left_band);
4320
4321 /**
4322 * @deprecated unused
4323 */
4324 attribute_deprecated
4325 int av_picture_pad(AVPicture *dst, const AVPicture *src, int height, int width, enum AVPixelFormat pix_fmt,
4326 int padtop, int padbottom, int padleft, int padright, int *color);
4327
4328 /**
4329 * @}
4330 */
4331 #endif
4332
4333 /**
4334 * @defgroup lavc_misc Utility functions
4335 * @ingroup libavc
4336 *
4337 * Miscellaneous utility functions related to both encoding and decoding
4338 * (or neither).
4339 * @{
4340 */
4341
4342 /**
4343 * @defgroup lavc_misc_pixfmt Pixel formats
4344 *
4345 * Functions for working with pixel formats.
4346 * @{
4347 */
4348
4349 /**
4350 * @deprecated Use av_pix_fmt_get_chroma_sub_sample
4351 */
4352
4353 void attribute_deprecated avcodec_get_chroma_sub_sample(enum AVPixelFormat pix_fmt, int *h_shift, int *v_shift);
4354
4355 /**
4356 * Return a value representing the fourCC code associated to the
4357 * pixel format pix_fmt, or 0 if no associated fourCC code can be
4358 * found.
4359 */
4360 unsigned int avcodec_pix_fmt_to_codec_tag(enum AVPixelFormat pix_fmt);
4361
4362 #define FF_LOSS_RESOLUTION 0x0001 /**< loss due to resolution change */
4363 #define FF_LOSS_DEPTH 0x0002 /**< loss due to color depth change */
4364 #define FF_LOSS_COLORSPACE 0x0004 /**< loss due to color space conversion */
4365 #define FF_LOSS_ALPHA 0x0008 /**< loss of alpha bits */
4366 #define FF_LOSS_COLORQUANT 0x0010 /**< loss due to color quantization */
4367 #define FF_LOSS_CHROMA 0x0020 /**< loss of chroma (e.g. RGB to gray conversion) */
4368
4369 /**
4370 * Compute what kind of losses will occur when converting from one specific
4371 * pixel format to another.
4372 * When converting from one pixel format to another, information loss may occur.
4373 * For example, when converting from RGB24 to GRAY, the color information will
4374 * be lost. Similarly, other losses occur when converting from some formats to
4375 * other formats. These losses can involve loss of chroma, but also loss of
4376 * resolution, loss of color depth, loss due to the color space conversion, loss
4377 * of the alpha bits or loss due to color quantization.
4378 * avcodec_get_fix_fmt_loss() informs you about the various types of losses
4379 * which will occur when converting from one pixel format to another.
4380 *
4381 * @param[in] dst_pix_fmt destination pixel format
4382 * @param[in] src_pix_fmt source pixel format
4383 * @param[in] has_alpha Whether the source pixel format alpha channel is used.
4384 * @return Combination of flags informing you what kind of losses will occur.
4385 */
4386 int avcodec_get_pix_fmt_loss(enum AVPixelFormat dst_pix_fmt, enum AVPixelFormat src_pix_fmt,
4387 int has_alpha);
4388
4389 /**
4390 * Find the best pixel format to convert to given a certain source pixel
4391 * format. When converting from one pixel format to another, information loss
4392 * may occur. For example, when converting from RGB24 to GRAY, the color
4393 * information will be lost. Similarly, other losses occur when converting from
4394 * some formats to other formats. avcodec_find_best_pix_fmt2() searches which of
4395 * the given pixel formats should be used to suffer the least amount of loss.
4396 * The pixel formats from which it chooses one, are determined by the
4397 * pix_fmt_list parameter.
4398 *
4399 *
4400 * @param[in] pix_fmt_list AV_PIX_FMT_NONE terminated array of pixel formats to choose from
4401 * @param[in] src_pix_fmt source pixel format
4402 * @param[in] has_alpha Whether the source pixel format alpha channel is used.
4403 * @param[out] loss_ptr Combination of flags informing you what kind of losses will occur.
4404 * @return The best pixel format to convert to or -1 if none was found.
4405 */
4406 enum AVPixelFormat avcodec_find_best_pix_fmt2(enum AVPixelFormat *pix_fmt_list,
4407 enum AVPixelFormat src_pix_fmt,
4408 int has_alpha, int *loss_ptr);
4409
4410 enum AVPixelFormat avcodec_default_get_format(struct AVCodecContext *s, const enum AVPixelFormat * fmt);
4411
4412 /**
4413 * @}
4414 */
4415
4416 #if FF_API_SET_DIMENSIONS
4417 /**
4418 * @deprecated this function is not supposed to be used from outside of lavc
4419 */
4420 attribute_deprecated
4421 void avcodec_set_dimensions(AVCodecContext *s, int width, int height);
4422 #endif
4423
4424 /**
4425 * Put a string representing the codec tag codec_tag in buf.
4426 *
4427 * @param buf buffer to place codec tag in
4428 * @param buf_size size in bytes of buf
4429 * @param codec_tag codec tag to assign
4430 * @return the length of the string that would have been generated if
4431 * enough space had been available, excluding the trailing null
4432 */
4433 size_t av_get_codec_tag_string(char *buf, size_t buf_size, unsigned int codec_tag);
4434
4435 void avcodec_string(char *buf, int buf_size, AVCodecContext *enc, int encode);
4436
4437 /**
4438 * Return a name for the specified profile, if available.
4439 *
4440 * @param codec the codec that is searched for the given profile
4441 * @param profile the profile value for which a name is requested
4442 * @return A name for the profile if found, NULL otherwise.
4443 */
4444 const char *av_get_profile_name(const AVCodec *codec, int profile);
4445
4446 /**
4447 * Return a name for the specified profile, if available.
4448 *
4449 * @param codec_id the ID of the codec to which the requested profile belongs
4450 * @param profile the profile value for which a name is requested
4451 * @return A name for the profile if found, NULL otherwise.
4452 *
4453 * @note unlike av_get_profile_name(), which searches a list of profiles
4454 * supported by a specific decoder or encoder implementation, this
4455 * function searches the list of profiles from the AVCodecDescriptor
4456 */
4457 const char *avcodec_profile_name(enum AVCodecID codec_id, int profile);
4458
4459 int avcodec_default_execute(AVCodecContext *c, int (*func)(AVCodecContext *c2, void *arg2),void *arg, int *ret, int count, int size);
4460 int avcodec_default_execute2(AVCodecContext *c, int (*func)(AVCodecContext *c2, void *arg2, int, int),void *arg, int *ret, int count);
4461 //FIXME func typedef
4462
4463 /**
4464 * Fill audio frame data and linesize.
4465 * AVFrame extended_data channel pointers are allocated if necessary for
4466 * planar audio.
4467 *
4468 * @param frame the AVFrame
4469 * frame->nb_samples must be set prior to calling the
4470 * function. This function fills in frame->data,
4471 * frame->extended_data, frame->linesize[0].
4472 * @param nb_channels channel count
4473 * @param sample_fmt sample format
4474 * @param buf buffer to use for frame data
4475 * @param buf_size size of buffer
4476 * @param align plane size sample alignment (0 = default)
4477 * @return 0 on success, negative error code on failure
4478 */
4479 int avcodec_fill_audio_frame(AVFrame *frame, int nb_channels,
4480 enum AVSampleFormat sample_fmt, const uint8_t *buf,
4481 int buf_size, int align);
4482
4483 /**
4484 * Reset the internal decoder state / flush internal buffers. Should be called
4485 * e.g. when seeking or when switching to a different stream.
4486 *
4487 * @note when refcounted frames are not used (i.e. avctx->refcounted_frames is 0),
4488 * this invalidates the frames previously returned from the decoder. When
4489 * refcounted frames are used, the decoder just releases any references it might
4490 * keep internally, but the caller's reference remains valid.
4491 */
4492 void avcodec_flush_buffers(AVCodecContext *avctx);
4493
4494 /**
4495 * Return codec bits per sample.
4496 *
4497 * @param[in] codec_id the codec
4498 * @return Number of bits per sample or zero if unknown for the given codec.
4499 */
4500 int av_get_bits_per_sample(enum AVCodecID codec_id);
4501
4502 /**
4503 * Return codec bits per sample.
4504 * Only return non-zero if the bits per sample is exactly correct, not an
4505 * approximation.
4506 *
4507 * @param[in] codec_id the codec
4508 * @return Number of bits per sample or zero if unknown for the given codec.
4509 */
4510 int av_get_exact_bits_per_sample(enum AVCodecID codec_id);
4511
4512 /**
4513 * Return audio frame duration.
4514 *
4515 * @param avctx codec context
4516 * @param frame_bytes size of the frame, or 0 if unknown
4517 * @return frame duration, in samples, if known. 0 if not able to
4518 * determine.
4519 */
4520 int av_get_audio_frame_duration(AVCodecContext *avctx, int frame_bytes);
4521
4522
4523 typedef struct AVBitStreamFilterContext {
4524 void *priv_data;
4525 struct AVBitStreamFilter *filter;
4526 AVCodecParserContext *parser;
4527 struct AVBitStreamFilterContext *next;
4528 } AVBitStreamFilterContext;
4529
4530
4531 typedef struct AVBitStreamFilter {
4532 const char *name;
4533 int priv_data_size;
4534 int (*filter)(AVBitStreamFilterContext *bsfc,
4535 AVCodecContext *avctx, const char *args,
4536 uint8_t **poutbuf, int *poutbuf_size,
4537 const uint8_t *buf, int buf_size, int keyframe);
4538 void (*close)(AVBitStreamFilterContext *bsfc);
4539 struct AVBitStreamFilter *next;
4540 } AVBitStreamFilter;
4541
4542 void av_register_bitstream_filter(AVBitStreamFilter *bsf);
4543 AVBitStreamFilterContext *av_bitstream_filter_init(const char *name);
4544 int av_bitstream_filter_filter(AVBitStreamFilterContext *bsfc,
4545 AVCodecContext *avctx, const char *args,
4546 uint8_t **poutbuf, int *poutbuf_size,
4547 const uint8_t *buf, int buf_size, int keyframe);
4548 void av_bitstream_filter_close(AVBitStreamFilterContext *bsf);
4549
4550 AVBitStreamFilter *av_bitstream_filter_next(const AVBitStreamFilter *f);
4551