f72058988f139cfe4e18b760fc21044544869846
[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
297 /* various PCM "codecs" */
298 AV_CODEC_ID_FIRST_AUDIO = 0x10000, ///< A dummy id pointing at the start of audio codecs
299 AV_CODEC_ID_PCM_S16LE = 0x10000,
300 AV_CODEC_ID_PCM_S16BE,
301 AV_CODEC_ID_PCM_U16LE,
302 AV_CODEC_ID_PCM_U16BE,
303 AV_CODEC_ID_PCM_S8,
304 AV_CODEC_ID_PCM_U8,
305 AV_CODEC_ID_PCM_MULAW,
306 AV_CODEC_ID_PCM_ALAW,
307 AV_CODEC_ID_PCM_S32LE,
308 AV_CODEC_ID_PCM_S32BE,
309 AV_CODEC_ID_PCM_U32LE,
310 AV_CODEC_ID_PCM_U32BE,
311 AV_CODEC_ID_PCM_S24LE,
312 AV_CODEC_ID_PCM_S24BE,
313 AV_CODEC_ID_PCM_U24LE,
314 AV_CODEC_ID_PCM_U24BE,
315 AV_CODEC_ID_PCM_S24DAUD,
316 AV_CODEC_ID_PCM_ZORK,
317 AV_CODEC_ID_PCM_S16LE_PLANAR,
318 AV_CODEC_ID_PCM_DVD,
319 AV_CODEC_ID_PCM_F32BE,
320 AV_CODEC_ID_PCM_F32LE,
321 AV_CODEC_ID_PCM_F64BE,
322 AV_CODEC_ID_PCM_F64LE,
323 AV_CODEC_ID_PCM_BLURAY,
324 AV_CODEC_ID_PCM_LXF,
325 AV_CODEC_ID_S302M,
326 AV_CODEC_ID_PCM_S8_PLANAR,
327 AV_CODEC_ID_PCM_S24LE_PLANAR,
328 AV_CODEC_ID_PCM_S32LE_PLANAR,
329
330 /* various ADPCM codecs */
331 AV_CODEC_ID_ADPCM_IMA_QT = 0x11000,
332 AV_CODEC_ID_ADPCM_IMA_WAV,
333 AV_CODEC_ID_ADPCM_IMA_DK3,
334 AV_CODEC_ID_ADPCM_IMA_DK4,
335 AV_CODEC_ID_ADPCM_IMA_WS,
336 AV_CODEC_ID_ADPCM_IMA_SMJPEG,
337 AV_CODEC_ID_ADPCM_MS,
338 AV_CODEC_ID_ADPCM_4XM,
339 AV_CODEC_ID_ADPCM_XA,
340 AV_CODEC_ID_ADPCM_ADX,
341 AV_CODEC_ID_ADPCM_EA,
342 AV_CODEC_ID_ADPCM_G726,
343 AV_CODEC_ID_ADPCM_CT,
344 AV_CODEC_ID_ADPCM_SWF,
345 AV_CODEC_ID_ADPCM_YAMAHA,
346 AV_CODEC_ID_ADPCM_SBPRO_4,
347 AV_CODEC_ID_ADPCM_SBPRO_3,
348 AV_CODEC_ID_ADPCM_SBPRO_2,
349 AV_CODEC_ID_ADPCM_THP,
350 AV_CODEC_ID_ADPCM_IMA_AMV,
351 AV_CODEC_ID_ADPCM_EA_R1,
352 AV_CODEC_ID_ADPCM_EA_R3,
353 AV_CODEC_ID_ADPCM_EA_R2,
354 AV_CODEC_ID_ADPCM_IMA_EA_SEAD,
355 AV_CODEC_ID_ADPCM_IMA_EA_EACS,
356 AV_CODEC_ID_ADPCM_EA_XAS,
357 AV_CODEC_ID_ADPCM_EA_MAXIS_XA,
358 AV_CODEC_ID_ADPCM_IMA_ISS,
359 AV_CODEC_ID_ADPCM_G722,
360 AV_CODEC_ID_ADPCM_IMA_APC,
361 AV_CODEC_ID_ADPCM_VIMA,
362
363 /* AMR */
364 AV_CODEC_ID_AMR_NB = 0x12000,
365 AV_CODEC_ID_AMR_WB,
366
367 /* RealAudio codecs*/
368 AV_CODEC_ID_RA_144 = 0x13000,
369 AV_CODEC_ID_RA_288,
370
371 /* various DPCM codecs */
372 AV_CODEC_ID_ROQ_DPCM = 0x14000,
373 AV_CODEC_ID_INTERPLAY_DPCM,
374 AV_CODEC_ID_XAN_DPCM,
375 AV_CODEC_ID_SOL_DPCM,
376
377 /* audio codecs */
378 AV_CODEC_ID_MP2 = 0x15000,
379 AV_CODEC_ID_MP3, ///< preferred ID for decoding MPEG audio layer 1, 2 or 3
380 AV_CODEC_ID_AAC,
381 AV_CODEC_ID_AC3,
382 AV_CODEC_ID_DTS,
383 AV_CODEC_ID_VORBIS,
384 AV_CODEC_ID_DVAUDIO,
385 AV_CODEC_ID_WMAV1,
386 AV_CODEC_ID_WMAV2,
387 AV_CODEC_ID_MACE3,
388 AV_CODEC_ID_MACE6,
389 AV_CODEC_ID_VMDAUDIO,
390 AV_CODEC_ID_FLAC,
391 AV_CODEC_ID_MP3ADU,
392 AV_CODEC_ID_MP3ON4,
393 AV_CODEC_ID_SHORTEN,
394 AV_CODEC_ID_ALAC,
395 AV_CODEC_ID_WESTWOOD_SND1,
396 AV_CODEC_ID_GSM, ///< as in Berlin toast format
397 AV_CODEC_ID_QDM2,
398 AV_CODEC_ID_COOK,
399 AV_CODEC_ID_TRUESPEECH,
400 AV_CODEC_ID_TTA,
401 AV_CODEC_ID_SMACKAUDIO,
402 AV_CODEC_ID_QCELP,
403 AV_CODEC_ID_WAVPACK,
404 AV_CODEC_ID_DSICINAUDIO,
405 AV_CODEC_ID_IMC,
406 AV_CODEC_ID_MUSEPACK7,
407 AV_CODEC_ID_MLP,
408 AV_CODEC_ID_GSM_MS, /* as found in WAV */
409 AV_CODEC_ID_ATRAC3,
410 #if FF_API_VOXWARE
411 AV_CODEC_ID_VOXWARE,
412 #endif
413 AV_CODEC_ID_APE,
414 AV_CODEC_ID_NELLYMOSER,
415 AV_CODEC_ID_MUSEPACK8,
416 AV_CODEC_ID_SPEEX,
417 AV_CODEC_ID_WMAVOICE,
418 AV_CODEC_ID_WMAPRO,
419 AV_CODEC_ID_WMALOSSLESS,
420 AV_CODEC_ID_ATRAC3P,
421 AV_CODEC_ID_EAC3,
422 AV_CODEC_ID_SIPR,
423 AV_CODEC_ID_MP1,
424 AV_CODEC_ID_TWINVQ,
425 AV_CODEC_ID_TRUEHD,
426 AV_CODEC_ID_MP4ALS,
427 AV_CODEC_ID_ATRAC1,
428 AV_CODEC_ID_BINKAUDIO_RDFT,
429 AV_CODEC_ID_BINKAUDIO_DCT,
430 AV_CODEC_ID_AAC_LATM,
431 AV_CODEC_ID_QDMC,
432 AV_CODEC_ID_CELT,
433 AV_CODEC_ID_G723_1,
434 AV_CODEC_ID_G729,
435 AV_CODEC_ID_8SVX_EXP,
436 AV_CODEC_ID_8SVX_FIB,
437 AV_CODEC_ID_BMV_AUDIO,
438 AV_CODEC_ID_RALF,
439 AV_CODEC_ID_IAC,
440 AV_CODEC_ID_ILBC,
441 AV_CODEC_ID_OPUS,
442 AV_CODEC_ID_COMFORT_NOISE,
443 AV_CODEC_ID_TAK,
444 AV_CODEC_ID_METASOUND,
445 AV_CODEC_ID_PAF_AUDIO,
446 AV_CODEC_ID_ON2AVC,
447
448 /* subtitle codecs */
449 AV_CODEC_ID_FIRST_SUBTITLE = 0x17000, ///< A dummy ID pointing at the start of subtitle codecs.
450 AV_CODEC_ID_DVD_SUBTITLE = 0x17000,
451 AV_CODEC_ID_DVB_SUBTITLE,
452 AV_CODEC_ID_TEXT, ///< raw UTF-8 text
453 AV_CODEC_ID_XSUB,
454 AV_CODEC_ID_SSA,
455 AV_CODEC_ID_MOV_TEXT,
456 AV_CODEC_ID_HDMV_PGS_SUBTITLE,
457 AV_CODEC_ID_DVB_TELETEXT,
458 AV_CODEC_ID_SRT,
459
460 /* other specific kind of codecs (generally used for attachments) */
461 AV_CODEC_ID_FIRST_UNKNOWN = 0x18000, ///< A dummy ID pointing at the start of various fake codecs.
462 AV_CODEC_ID_TTF = 0x18000,
463
464 AV_CODEC_ID_PROBE = 0x19000, ///< codec_id is not known (like AV_CODEC_ID_NONE) but lavf should attempt to identify it
465
466 AV_CODEC_ID_MPEG2TS = 0x20000, /**< _FAKE_ codec to indicate a raw MPEG-2 TS
467 * stream (only used by libavformat) */
468 AV_CODEC_ID_MPEG4SYSTEMS = 0x20001, /**< _FAKE_ codec to indicate a MPEG-4 Systems
469 * stream (only used by libavformat) */
470 AV_CODEC_ID_FFMETADATA = 0x21000, ///< Dummy codec for streams containing only metadata information.
471 };
472
473 /**
474 * This struct describes the properties of a single codec described by an
475 * AVCodecID.
476 * @see avcodec_get_descriptor()
477 */
478 typedef struct AVCodecDescriptor {
479 enum AVCodecID id;
480 enum AVMediaType type;
481 /**
482 * Name of the codec described by this descriptor. It is non-empty and
483 * unique for each codec descriptor. It should contain alphanumeric
484 * characters and '_' only.
485 */
486 const char *name;
487 /**
488 * A more descriptive name for this codec. May be NULL.
489 */
490 const char *long_name;
491 /**
492 * Codec properties, a combination of AV_CODEC_PROP_* flags.
493 */
494 int props;
495 } AVCodecDescriptor;
496
497 /**
498 * Codec uses only intra compression.
499 * Video codecs only.
500 */
501 #define AV_CODEC_PROP_INTRA_ONLY (1 << 0)
502 /**
503 * Codec supports lossy compression. Audio and video codecs only.
504 * @note a codec may support both lossy and lossless
505 * compression modes
506 */
507 #define AV_CODEC_PROP_LOSSY (1 << 1)
508 /**
509 * Codec supports lossless compression. Audio and video codecs only.
510 */
511 #define AV_CODEC_PROP_LOSSLESS (1 << 2)
512
513 /**
514 * @ingroup lavc_decoding
515 * Required number of additionally allocated bytes at the end of the input bitstream for decoding.
516 * This is mainly needed because some optimized bitstream readers read
517 * 32 or 64 bit at once and could read over the end.<br>
518 * Note: If the first 23 bits of the additional bytes are not 0, then damaged
519 * MPEG bitstreams could cause overread and segfault.
520 */
521 #define FF_INPUT_BUFFER_PADDING_SIZE 8
522
523 /**
524 * @ingroup lavc_encoding
525 * minimum encoding buffer size
526 * Used to avoid some checks during header writing.
527 */
528 #define FF_MIN_BUFFER_SIZE 16384
529
530
531 /**
532 * @ingroup lavc_encoding
533 * motion estimation type.
534 */
535 enum Motion_Est_ID {
536 ME_ZERO = 1, ///< no search, that is use 0,0 vector whenever one is needed
537 ME_FULL,
538 ME_LOG,
539 ME_PHODS,
540 ME_EPZS, ///< enhanced predictive zonal search
541 ME_X1, ///< reserved for experiments
542 ME_HEX, ///< hexagon based search
543 ME_UMH, ///< uneven multi-hexagon search
544 ME_TESA, ///< transformed exhaustive search algorithm
545 };
546
547 /**
548 * @ingroup lavc_decoding
549 */
550 enum AVDiscard{
551 /* We leave some space between them for extensions (drop some
552 * keyframes for intra-only or drop just some bidir frames). */
553 AVDISCARD_NONE =-16, ///< discard nothing
554 AVDISCARD_DEFAULT = 0, ///< discard useless packets like 0 size packets in avi
555 AVDISCARD_NONREF = 8, ///< discard all non reference
556 AVDISCARD_BIDIR = 16, ///< discard all bidirectional frames
557 AVDISCARD_NONKEY = 32, ///< discard all frames except keyframes
558 AVDISCARD_ALL = 48, ///< discard all
559 };
560
561 enum AVColorPrimaries{
562 AVCOL_PRI_BT709 = 1, ///< also ITU-R BT1361 / IEC 61966-2-4 / SMPTE RP177 Annex B
563 AVCOL_PRI_UNSPECIFIED = 2,
564 AVCOL_PRI_BT470M = 4,
565 AVCOL_PRI_BT470BG = 5, ///< also ITU-R BT601-6 625 / ITU-R BT1358 625 / ITU-R BT1700 625 PAL & SECAM
566 AVCOL_PRI_SMPTE170M = 6, ///< also ITU-R BT601-6 525 / ITU-R BT1358 525 / ITU-R BT1700 NTSC
567 AVCOL_PRI_SMPTE240M = 7, ///< functionally identical to above
568 AVCOL_PRI_FILM = 8,
569 AVCOL_PRI_BT2020 = 9, ///< ITU-R BT2020
570 AVCOL_PRI_NB , ///< Not part of ABI
571 };
572
573 enum AVColorTransferCharacteristic{
574 AVCOL_TRC_BT709 = 1, ///< also ITU-R BT1361
575 AVCOL_TRC_UNSPECIFIED = 2,
576 AVCOL_TRC_GAMMA22 = 4, ///< also ITU-R BT470M / ITU-R BT1700 625 PAL & SECAM
577 AVCOL_TRC_GAMMA28 = 5, ///< also ITU-R BT470BG
578 AVCOL_TRC_SMPTE170M = 6, ///< also ITU-R BT601-6 525 or 625 / ITU-R BT1358 525 or 625 / ITU-R BT1700 NTSC
579 AVCOL_TRC_SMPTE240M = 7,
580 AVCOL_TRC_LINEAR = 8, ///< "Linear transfer characteristics"
581 AVCOL_TRC_LOG = 9, ///< "Logarithmic transfer characteristic (100:1 range)"
582 AVCOL_TRC_LOG_SQRT = 10, ///< "Logarithmic transfer characteristic (100 * Sqrt( 10 ) : 1 range)"
583 AVCOL_TRC_IEC61966_2_4 = 11, ///< IEC 61966-2-4
584 AVCOL_TRC_BT1361_ECG = 12, ///< ITU-R BT1361 Extended Colour Gamut
585 AVCOL_TRC_IEC61966_2_1 = 13, ///< IEC 61966-2-1 (sRGB or sYCC)
586 AVCOL_TRC_BT2020_10 = 14, ///< ITU-R BT2020 for 10 bit system
587 AVCOL_TRC_BT2020_12 = 15, ///< ITU-R BT2020 for 12 bit system
588 AVCOL_TRC_NB , ///< Not part of ABI
589 };
590
591 enum AVColorSpace{
592 AVCOL_SPC_RGB = 0,
593 AVCOL_SPC_BT709 = 1, ///< also ITU-R BT1361 / IEC 61966-2-4 xvYCC709 / SMPTE RP177 Annex B
594 AVCOL_SPC_UNSPECIFIED = 2,
595 AVCOL_SPC_FCC = 4,
596 AVCOL_SPC_BT470BG = 5, ///< also ITU-R BT601-6 625 / ITU-R BT1358 625 / ITU-R BT1700 625 PAL & SECAM / IEC 61966-2-4 xvYCC601
597 AVCOL_SPC_SMPTE170M = 6, ///< also ITU-R BT601-6 525 / ITU-R BT1358 525 / ITU-R BT1700 NTSC / functionally identical to above
598 AVCOL_SPC_SMPTE240M = 7,
599 AVCOL_SPC_YCOCG = 8, ///< Used by Dirac / VC-2 and H.264 FRext, see ITU-T SG16
600 AVCOL_SPC_BT2020_NCL = 9, ///< ITU-R BT2020 non-constant luminance system
601 AVCOL_SPC_BT2020_CL = 10, ///< ITU-R BT2020 constant luminance system
602 AVCOL_SPC_NB , ///< Not part of ABI
603 };
604
605 enum AVColorRange{
606 AVCOL_RANGE_UNSPECIFIED = 0,
607 AVCOL_RANGE_MPEG = 1, ///< the normal 219*2^(n-8) "MPEG" YUV ranges
608 AVCOL_RANGE_JPEG = 2, ///< the normal 2^n-1 "JPEG" YUV ranges
609 AVCOL_RANGE_NB , ///< Not part of ABI
610 };
611
612 /**
613 * X X 3 4 X X are luma samples,
614 * 1 2 1-6 are possible chroma positions
615 * X X 5 6 X 0 is undefined/unknown position
616 */
617 enum AVChromaLocation{
618 AVCHROMA_LOC_UNSPECIFIED = 0,
619 AVCHROMA_LOC_LEFT = 1, ///< mpeg2/4, h264 default
620 AVCHROMA_LOC_CENTER = 2, ///< mpeg1, jpeg, h263
621 AVCHROMA_LOC_TOPLEFT = 3, ///< DV
622 AVCHROMA_LOC_TOP = 4,
623 AVCHROMA_LOC_BOTTOMLEFT = 5,
624 AVCHROMA_LOC_BOTTOM = 6,
625 AVCHROMA_LOC_NB , ///< Not part of ABI
626 };
627
628 enum AVAudioServiceType {
629 AV_AUDIO_SERVICE_TYPE_MAIN = 0,
630 AV_AUDIO_SERVICE_TYPE_EFFECTS = 1,
631 AV_AUDIO_SERVICE_TYPE_VISUALLY_IMPAIRED = 2,
632 AV_AUDIO_SERVICE_TYPE_HEARING_IMPAIRED = 3,
633 AV_AUDIO_SERVICE_TYPE_DIALOGUE = 4,
634 AV_AUDIO_SERVICE_TYPE_COMMENTARY = 5,
635 AV_AUDIO_SERVICE_TYPE_EMERGENCY = 6,
636 AV_AUDIO_SERVICE_TYPE_VOICE_OVER = 7,
637 AV_AUDIO_SERVICE_TYPE_KARAOKE = 8,
638 AV_AUDIO_SERVICE_TYPE_NB , ///< Not part of ABI
639 };
640
641 /**
642 * @ingroup lavc_encoding
643 */
644 typedef struct RcOverride{
645 int start_frame;
646 int end_frame;
647 int qscale; // If this is 0 then quality_factor will be used instead.
648 float quality_factor;
649 } RcOverride;
650
651 #if FF_API_MAX_BFRAMES
652 /**
653 * @deprecated there is no libavcodec-wide limit on the number of B-frames
654 */
655 #define FF_MAX_B_FRAMES 16
656 #endif
657
658 /* encoding support
659 These flags can be passed in AVCodecContext.flags before initialization.
660 Note: Not everything is supported yet.
661 */
662
663 /**
664 * Allow decoders to produce frames with data planes that are not aligned
665 * to CPU requirements (e.g. due to cropping).
666 */
667 #define CODEC_FLAG_UNALIGNED 0x0001
668 #define CODEC_FLAG_QSCALE 0x0002 ///< Use fixed qscale.
669 #define CODEC_FLAG_4MV 0x0004 ///< 4 MV per MB allowed / advanced prediction for H.263.
670 #define CODEC_FLAG_OUTPUT_CORRUPT 0x0008 ///< Output even those frames that might be corrupted
671 #define CODEC_FLAG_QPEL 0x0010 ///< Use qpel MC.
672 #if FF_API_GMC
673 /**
674 * @deprecated use the "gmc" private option of the libxvid encoder
675 */
676 #define CODEC_FLAG_GMC 0x0020 ///< Use GMC.
677 #endif
678 #if FF_API_MV0
679 /**
680 * @deprecated use the flag "mv0" in the "mpv_flags" private option of the
681 * mpegvideo encoders
682 */
683 #define CODEC_FLAG_MV0 0x0040
684 #endif
685 #if FF_API_INPUT_PRESERVED
686 /**
687 * @deprecated passing reference-counted frames to the encoders replaces this
688 * flag
689 */
690 #define CODEC_FLAG_INPUT_PRESERVED 0x0100
691 #endif
692 #define CODEC_FLAG_PASS1 0x0200 ///< Use internal 2pass ratecontrol in first pass mode.
693 #define CODEC_FLAG_PASS2 0x0400 ///< Use internal 2pass ratecontrol in second pass mode.
694 #define CODEC_FLAG_GRAY 0x2000 ///< Only decode/encode grayscale.
695 #if FF_API_EMU_EDGE
696 /**
697 * @deprecated edges are not used/required anymore. I.e. this flag is now always
698 * set.
699 */
700 #define CODEC_FLAG_EMU_EDGE 0x4000
701 #endif
702 #define CODEC_FLAG_PSNR 0x8000 ///< error[?] variables will be set during encoding.
703 #define CODEC_FLAG_TRUNCATED 0x00010000 /** Input bitstream might be truncated at a random
704 location instead of only at frame boundaries. */
705 #if FF_API_NORMALIZE_AQP
706 /**
707 * @deprecated use the flag "naq" in the "mpv_flags" private option of the
708 * mpegvideo encoders
709 */
710 #define CODEC_FLAG_NORMALIZE_AQP 0x00020000
711 #endif
712 #define CODEC_FLAG_INTERLACED_DCT 0x00040000 ///< Use interlaced DCT.
713 #define CODEC_FLAG_LOW_DELAY 0x00080000 ///< Force low delay.
714 #define CODEC_FLAG_GLOBAL_HEADER 0x00400000 ///< Place global headers in extradata instead of every keyframe.
715 #define CODEC_FLAG_BITEXACT 0x00800000 ///< Use only bitexact stuff (except (I)DCT).
716 /* Fx : Flag for h263+ extra options */
717 #define CODEC_FLAG_AC_PRED 0x01000000 ///< H.263 advanced intra coding / MPEG-4 AC prediction
718 #define CODEC_FLAG_LOOP_FILTER 0x00000800 ///< loop filter
719 #define CODEC_FLAG_INTERLACED_ME 0x20000000 ///< interlaced motion estimation
720 #define CODEC_FLAG_CLOSED_GOP 0x80000000
721 #define CODEC_FLAG2_FAST 0x00000001 ///< Allow non spec compliant speedup tricks.
722 #define CODEC_FLAG2_NO_OUTPUT 0x00000004 ///< Skip bitstream encoding.
723 #define CODEC_FLAG2_LOCAL_HEADER 0x00000008 ///< Place global headers at every keyframe instead of in extradata.
724 #define CODEC_FLAG2_IGNORE_CROP 0x00010000 ///< Discard cropping information from SPS.
725
726 #define CODEC_FLAG2_CHUNKS 0x00008000 ///< Input bitstream might be truncated at a packet boundaries instead of only at frame boundaries.
727
728 /* Unsupported options :
729 * Syntax Arithmetic coding (SAC)
730 * Reference Picture Selection
731 * Independent Segment Decoding */
732 /* /Fx */
733 /* codec capabilities */
734
735 #define CODEC_CAP_DRAW_HORIZ_BAND 0x0001 ///< Decoder can use draw_horiz_band callback.
736 /**
737 * Codec uses get_buffer() for allocating buffers and supports custom allocators.
738 * If not set, it might not use get_buffer() at all or use operations that
739 * assume the buffer was allocated by avcodec_default_get_buffer.
740 */
741 #define CODEC_CAP_DR1 0x0002
742 #define CODEC_CAP_TRUNCATED 0x0008
743 #if FF_API_XVMC
744 /* Codec can export data for HW decoding (XvMC). */
745 #define CODEC_CAP_HWACCEL 0x0010
746 #endif /* FF_API_XVMC */
747 /**
748 * Encoder or decoder requires flushing with NULL input at the end in order to
749 * give the complete and correct output.
750 *
751 * NOTE: If this flag is not set, the codec is guaranteed to never be fed with
752 * with NULL data. The user can still send NULL data to the public encode
753 * or decode function, but libavcodec will not pass it along to the codec
754 * unless this flag is set.
755 *
756 * Decoders:
757 * The decoder has a non-zero delay and needs to be fed with avpkt->data=NULL,
758 * avpkt->size=0 at the end to get the delayed data until the decoder no longer
759 * returns frames.
760 *
761 * Encoders:
762 * The encoder needs to be fed with NULL data at the end of encoding until the
763 * encoder no longer returns data.
764 *
765 * NOTE: For encoders implementing the AVCodec.encode2() function, setting this
766 * flag also means that the encoder must set the pts and duration for
767 * each output packet. If this flag is not set, the pts and duration will
768 * be determined by libavcodec from the input frame.
769 */
770 #define CODEC_CAP_DELAY 0x0020
771 /**
772 * Codec can be fed a final frame with a smaller size.
773 * This can be used to prevent truncation of the last audio samples.
774 */
775 #define CODEC_CAP_SMALL_LAST_FRAME 0x0040
776 #if FF_API_CAP_VDPAU
777 /**
778 * Codec can export data for HW decoding (VDPAU).
779 */
780 #define CODEC_CAP_HWACCEL_VDPAU 0x0080
781 #endif
782 /**
783 * Codec can output multiple frames per AVPacket
784 * Normally demuxers return one frame at a time, demuxers which do not do
785 * are connected to a parser to split what they return into proper frames.
786 * This flag is reserved to the very rare category of codecs which have a
787 * bitstream that cannot be split into frames without timeconsuming
788 * operations like full decoding. Demuxers carring such bitstreams thus
789 * may return multiple frames in a packet. This has many disadvantages like
790 * prohibiting stream copy in many cases thus it should only be considered
791 * as a last resort.
792 */
793 #define CODEC_CAP_SUBFRAMES 0x0100
794 /**
795 * Codec is experimental and is thus avoided in favor of non experimental
796 * encoders
797 */
798 #define CODEC_CAP_EXPERIMENTAL 0x0200
799 /**
800 * Codec should fill in channel configuration and samplerate instead of container
801 */
802 #define CODEC_CAP_CHANNEL_CONF 0x0400
803 #if FF_API_NEG_LINESIZES
804 /**
805 * @deprecated no codecs use this capability
806 */
807 #define CODEC_CAP_NEG_LINESIZES 0x0800
808 #endif
809 /**
810 * Codec supports frame-level multithreading.
811 */
812 #define CODEC_CAP_FRAME_THREADS 0x1000
813 /**
814 * Codec supports slice-based (or partition-based) multithreading.
815 */
816 #define CODEC_CAP_SLICE_THREADS 0x2000
817 /**
818 * Codec supports changed parameters at any point.
819 */
820 #define CODEC_CAP_PARAM_CHANGE 0x4000
821 /**
822 * Codec supports avctx->thread_count == 0 (auto).
823 */
824 #define CODEC_CAP_AUTO_THREADS 0x8000
825 /**
826 * Audio encoder supports receiving a different number of samples in each call.
827 */
828 #define CODEC_CAP_VARIABLE_FRAME_SIZE 0x10000
829
830 #if FF_API_MB_TYPE
831 //The following defines may change, don't expect compatibility if you use them.
832 #define MB_TYPE_INTRA4x4 0x0001
833 #define MB_TYPE_INTRA16x16 0x0002 //FIXME H.264-specific
834 #define MB_TYPE_INTRA_PCM 0x0004 //FIXME H.264-specific
835 #define MB_TYPE_16x16 0x0008
836 #define MB_TYPE_16x8 0x0010
837 #define MB_TYPE_8x16 0x0020
838 #define MB_TYPE_8x8 0x0040
839 #define MB_TYPE_INTERLACED 0x0080
840 #define MB_TYPE_DIRECT2 0x0100 //FIXME
841 #define MB_TYPE_ACPRED 0x0200
842 #define MB_TYPE_GMC 0x0400
843 #define MB_TYPE_SKIP 0x0800
844 #define MB_TYPE_P0L0 0x1000
845 #define MB_TYPE_P1L0 0x2000
846 #define MB_TYPE_P0L1 0x4000
847 #define MB_TYPE_P1L1 0x8000
848 #define MB_TYPE_L0 (MB_TYPE_P0L0 | MB_TYPE_P1L0)
849 #define MB_TYPE_L1 (MB_TYPE_P0L1 | MB_TYPE_P1L1)
850 #define MB_TYPE_L0L1 (MB_TYPE_L0 | MB_TYPE_L1)
851 #define MB_TYPE_QUANT 0x00010000
852 #define MB_TYPE_CBP 0x00020000
853 //Note bits 24-31 are reserved for codec specific use (h264 ref0, mpeg1 0mv, ...)
854 #endif
855
856 /**
857 * Pan Scan area.
858 * This specifies the area which should be displayed.
859 * Note there may be multiple such areas for one frame.
860 */
861 typedef struct AVPanScan{
862 /**
863 * id
864 * - encoding: Set by user.
865 * - decoding: Set by libavcodec.
866 */
867 int id;
868
869 /**
870 * width and height in 1/16 pel
871 * - encoding: Set by user.
872 * - decoding: Set by libavcodec.
873 */
874 int width;
875 int height;
876
877 /**
878 * position of the top left corner in 1/16 pel for up to 3 fields/frames
879 * - encoding: Set by user.
880 * - decoding: Set by libavcodec.
881 */
882 int16_t position[3][2];
883 }AVPanScan;
884
885 #if FF_API_QSCALE_TYPE
886 #define FF_QSCALE_TYPE_MPEG1 0
887 #define FF_QSCALE_TYPE_MPEG2 1
888 #define FF_QSCALE_TYPE_H264 2
889 #define FF_QSCALE_TYPE_VP56 3
890 #endif
891
892 #if FF_API_GET_BUFFER
893 #define FF_BUFFER_TYPE_INTERNAL 1
894 #define FF_BUFFER_TYPE_USER 2 ///< direct rendering buffers (image is (de)allocated by user)
895 #define FF_BUFFER_TYPE_SHARED 4 ///< Buffer from somewhere else; don't deallocate image (data/base), all other tables are not shared.
896 #define FF_BUFFER_TYPE_COPY 8 ///< Just a (modified) copy of some other buffer, don't deallocate anything.
897
898 #define FF_BUFFER_HINTS_VALID 0x01 // Buffer hints value is meaningful (if 0 ignore).
899 #define FF_BUFFER_HINTS_READABLE 0x02 // Codec will read from buffer.
900 #define FF_BUFFER_HINTS_PRESERVE 0x04 // User must not alter buffer content.
901 #define FF_BUFFER_HINTS_REUSABLE 0x08 // Codec will reuse the buffer (update).
902 #endif
903
904 /**
905 * The decoder will keep a reference to the frame and may reuse it later.
906 */
907 #define AV_GET_BUFFER_FLAG_REF (1 << 0)
908
909 /**
910 * @defgroup lavc_packet AVPacket
911 *
912 * Types and functions for working with AVPacket.
913 * @{
914 */
915 enum AVPacketSideDataType {
916 AV_PKT_DATA_PALETTE,
917 AV_PKT_DATA_NEW_EXTRADATA,
918
919 /**
920 * An AV_PKT_DATA_PARAM_CHANGE side data packet is laid out as follows:
921 * @code
922 * u32le param_flags
923 * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_COUNT)
924 * s32le channel_count
925 * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_LAYOUT)
926 * u64le channel_layout
927 * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_SAMPLE_RATE)
928 * s32le sample_rate
929 * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_DIMENSIONS)
930 * s32le width
931 * s32le height
932 * @endcode
933 */
934 AV_PKT_DATA_PARAM_CHANGE,
935
936 /**
937 * An AV_PKT_DATA_H263_MB_INFO side data packet contains a number of
938 * structures with info about macroblocks relevant to splitting the
939 * packet into smaller packets on macroblock edges (e.g. as for RFC 2190).
940 * That is, it does not necessarily contain info about all macroblocks,
941 * as long as the distance between macroblocks in the info is smaller
942 * than the target payload size.
943 * Each MB info structure is 12 bytes, and is laid out as follows:
944 * @code
945 * u32le bit offset from the start of the packet
946 * u8 current quantizer at the start of the macroblock
947 * u8 GOB number
948 * u16le macroblock address within the GOB
949 * u8 horizontal MV predictor
950 * u8 vertical MV predictor
951 * u8 horizontal MV predictor for block number 3
952 * u8 vertical MV predictor for block number 3
953 * @endcode
954 */
955 AV_PKT_DATA_H263_MB_INFO,
956
957 /**
958 * This side data should be associated with an audio stream and contains
959 * ReplayGain information in form of the AVReplayGain struct.
960 */
961 AV_PKT_DATA_REPLAYGAIN,
962 };
963
964 typedef struct AVPacketSideData {
965 uint8_t *data;
966 int size;
967 enum AVPacketSideDataType type;
968 } AVPacketSideData;
969
970 /**
971 * This structure stores compressed data. It is typically exported by demuxers
972 * and then passed as input to decoders, or received as output from encoders and
973 * then passed to muxers.
974 *
975 * For video, it should typically contain one compressed frame. For audio it may
976 * contain several compressed frames.
977 *
978 * AVPacket is one of the few structs in Libav, whose size is a part of public
979 * ABI. Thus it may be allocated on stack and no new fields can be added to it
980 * without libavcodec and libavformat major bump.
981 *
982 * The semantics of data ownership depends on the buf or destruct (deprecated)
983 * fields. If either is set, the packet data is dynamically allocated and is
984 * valid indefinitely until av_free_packet() is called (which in turn calls
985 * av_buffer_unref()/the destruct callback to free the data). If neither is set,
986 * the packet data is typically backed by some static buffer somewhere and is
987 * only valid for a limited time (e.g. until the next read call when demuxing).
988 *
989 * The side data is always allocated with av_malloc() and is freed in
990 * av_free_packet().
991 */
992 typedef struct AVPacket {
993 /**
994 * A reference to the reference-counted buffer where the packet data is
995 * stored.
996 * May be NULL, then the packet data is not reference-counted.
997 */
998 AVBufferRef *buf;
999 /**
1000 * Presentation timestamp in AVStream->time_base units; the time at which
1001 * the decompressed packet will be presented to the user.
1002 * Can be AV_NOPTS_VALUE if it is not stored in the file.
1003 * pts MUST be larger or equal to dts as presentation cannot happen before
1004 * decompression, unless one wants to view hex dumps. Some formats misuse
1005 * the terms dts and pts/cts to mean something different. Such timestamps
1006 * must be converted to true pts/dts before they are stored in AVPacket.
1007 */
1008 int64_t pts;
1009 /**
1010 * Decompression timestamp in AVStream->time_base units; the time at which
1011 * the packet is decompressed.
1012 * Can be AV_NOPTS_VALUE if it is not stored in the file.
1013 */
1014 int64_t dts;
1015 uint8_t *data;
1016 int size;
1017 int stream_index;
1018 /**
1019 * A combination of AV_PKT_FLAG values
1020 */
1021 int flags;
1022 /**
1023 * Additional packet data that can be provided by the container.
1024 * Packet can contain several types of side information.
1025 */
1026 AVPacketSideData *side_data;
1027 int side_data_elems;
1028
1029 /**
1030 * Duration of this packet in AVStream->time_base units, 0 if unknown.
1031 * Equals next_pts - this_pts in presentation order.
1032 */
1033 int duration;
1034 #if FF_API_DESTRUCT_PACKET
1035 attribute_deprecated
1036 void (*destruct)(struct AVPacket *);
1037 attribute_deprecated
1038 void *priv;
1039 #endif
1040 int64_t pos; ///< byte position in stream, -1 if unknown
1041
1042 /**
1043 * Time difference in AVStream->time_base units from the pts of this
1044 * packet to the point at which the output from the decoder has converged
1045 * independent from the availability of previous frames. That is, the
1046 * frames are virtually identical no matter if decoding started from
1047 * the very first frame or from this keyframe.
1048 * Is AV_NOPTS_VALUE if unknown.
1049 * This field is not the display duration of the current packet.
1050 * This field has no meaning if the packet does not have AV_PKT_FLAG_KEY
1051 * set.
1052 *
1053 * The purpose of this field is to allow seeking in streams that have no
1054 * keyframes in the conventional sense. It corresponds to the
1055 * recovery point SEI in H.264 and match_time_delta in NUT. It is also
1056 * essential for some types of subtitle streams to ensure that all
1057 * subtitles are correctly displayed after seeking.
1058 */
1059 int64_t convergence_duration;
1060 } AVPacket;
1061 #define AV_PKT_FLAG_KEY 0x0001 ///< The packet contains a keyframe
1062 #define AV_PKT_FLAG_CORRUPT 0x0002 ///< The packet content is corrupted
1063
1064 enum AVSideDataParamChangeFlags {
1065 AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_COUNT = 0x0001,
1066 AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_LAYOUT = 0x0002,
1067 AV_SIDE_DATA_PARAM_CHANGE_SAMPLE_RATE = 0x0004,
1068 AV_SIDE_DATA_PARAM_CHANGE_DIMENSIONS = 0x0008,
1069 };
1070 /**
1071 * @}
1072 */
1073
1074 struct AVCodecInternal;
1075
1076 enum AVFieldOrder {
1077 AV_FIELD_UNKNOWN,
1078 AV_FIELD_PROGRESSIVE,
1079 AV_FIELD_TT, //< Top coded_first, top displayed first
1080 AV_FIELD_BB, //< Bottom coded first, bottom displayed first
1081 AV_FIELD_TB, //< Top coded first, bottom displayed first
1082 AV_FIELD_BT, //< Bottom coded first, top displayed first
1083 };
1084
1085 /**
1086 * main external API structure.
1087 * New fields can be added to the end with minor version bumps.
1088 * Removal, reordering and changes to existing fields require a major
1089 * version bump.
1090 * sizeof(AVCodecContext) must not be used outside libav*.
1091 */
1092 typedef struct AVCodecContext {
1093 /**
1094 * information on struct for av_log
1095 * - set by avcodec_alloc_context3
1096 */
1097 const AVClass *av_class;
1098 int log_level_offset;
1099
1100 enum AVMediaType codec_type; /* see AVMEDIA_TYPE_xxx */
1101 const struct AVCodec *codec;
1102 #if FF_API_CODEC_NAME
1103 /**
1104 * @deprecated this field is not used for anything in libavcodec
1105 */
1106 attribute_deprecated
1107 char codec_name[32];
1108 #endif
1109 enum AVCodecID codec_id; /* see AV_CODEC_ID_xxx */
1110
1111 /**
1112 * fourcc (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A').
1113 * This is used to work around some encoder bugs.
1114 * A demuxer should set this to what is stored in the field used to identify the codec.
1115 * If there are multiple such fields in a container then the demuxer should choose the one
1116 * which maximizes the information about the used codec.
1117 * If the codec tag field in a container is larger than 32 bits then the demuxer should
1118 * remap the longer ID to 32 bits with a table or other structure. Alternatively a new
1119 * extra_codec_tag + size could be added but for this a clear advantage must be demonstrated
1120 * first.
1121 * - encoding: Set by user, if not then the default based on codec_id will be used.
1122 * - decoding: Set by user, will be converted to uppercase by libavcodec during init.
1123 */
1124 unsigned int codec_tag;
1125
1126 /**
1127 * fourcc from the AVI stream header (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A').
1128 * This is used to work around some encoder bugs.
1129 * - encoding: unused
1130 * - decoding: Set by user, will be converted to uppercase by libavcodec during init.
1131 */
1132 unsigned int stream_codec_tag;
1133
1134 void *priv_data;
1135
1136 /**
1137 * Private context used for internal data.
1138 *
1139 * Unlike priv_data, this is not codec-specific. It is used in general
1140 * libavcodec functions.
1141 */
1142 struct AVCodecInternal *internal;
1143
1144 /**
1145 * Private data of the user, can be used to carry app specific stuff.
1146 * - encoding: Set by user.
1147 * - decoding: Set by user.
1148 */
1149 void *opaque;
1150
1151 /**
1152 * the average bitrate
1153 * - encoding: Set by user; unused for constant quantizer encoding.
1154 * - decoding: Set by libavcodec. 0 or some bitrate if this info is available in the stream.
1155 */
1156 int bit_rate;
1157
1158 /**
1159 * number of bits the bitstream is allowed to diverge from the reference.
1160 * the reference can be CBR (for CBR pass1) or VBR (for pass2)
1161 * - encoding: Set by user; unused for constant quantizer encoding.
1162 * - decoding: unused
1163 */
1164 int bit_rate_tolerance;
1165
1166 /**
1167 * Global quality for codecs which cannot change it per frame.
1168 * This should be proportional to MPEG-1/2/4 qscale.
1169 * - encoding: Set by user.
1170 * - decoding: unused
1171 */
1172 int global_quality;
1173
1174 /**
1175 * - encoding: Set by user.
1176 * - decoding: unused
1177 */
1178 int compression_level;
1179 #define FF_COMPRESSION_DEFAULT -1
1180
1181 /**
1182 * CODEC_FLAG_*.
1183 * - encoding: Set by user.
1184 * - decoding: Set by user.
1185 */
1186 int flags;
1187
1188 /**
1189 * CODEC_FLAG2_*
1190 * - encoding: Set by user.
1191 * - decoding: Set by user.
1192 */
1193 int flags2;
1194
1195 /**
1196 * some codecs need / can use extradata like Huffman tables.
1197 * mjpeg: Huffman tables
1198 * rv10: additional flags
1199 * mpeg4: global headers (they can be in the bitstream or here)
1200 * The allocated memory should be FF_INPUT_BUFFER_PADDING_SIZE bytes larger
1201 * than extradata_size to avoid prolems if it is read with the bitstream reader.
1202 * The bytewise contents of extradata must not depend on the architecture or CPU endianness.
1203 * - encoding: Set/allocated/freed by libavcodec.
1204 * - decoding: Set/allocated/freed by user.
1205 */
1206 uint8_t *extradata;
1207 int extradata_size;
1208
1209 /**
1210 * This is the fundamental unit of time (in seconds) in terms
1211 * of which frame timestamps are represented. For fixed-fps content,
1212 * timebase should be 1/framerate and timestamp increments should be
1213 * identically 1.
1214 * - encoding: MUST be set by user.
1215 * - decoding: Set by libavcodec.
1216 */
1217 AVRational time_base;
1218
1219 /**
1220 * For some codecs, the time base is closer to the field rate than the frame rate.
1221 * Most notably, H.264 and MPEG-2 specify time_base as half of frame duration
1222 * if no telecine is used ...
1223 *
1224 * Set to time_base ticks per frame. Default 1, e.g., H.264/MPEG-2 set it to 2.
1225 */
1226 int ticks_per_frame;
1227
1228 /**
1229 * Codec delay.
1230 *
1231 * Video:
1232 * Number of frames the decoded output will be delayed relative to the
1233 * encoded input.
1234 *
1235 * Audio:
1236 * For encoding, this is the number of "priming" samples added by the
1237 * encoder to the beginning of the stream. The decoded output will be
1238 * delayed by this many samples relative to the input to the encoder (or
1239 * more, if the decoder adds its own padding).
1240 * The timestamps on the output packets are adjusted by the encoder so
1241 * that they always refer to the first sample of the data actually
1242 * contained in the packet, including any added padding.
1243 * E.g. if the timebase is 1/samplerate and the timestamp of the first
1244 * input sample is 0, the timestamp of the first output packet will be
1245 * -delay.
1246 *
1247 * For decoding, this is the number of samples the decoder needs to
1248 * output before the decoder's output is valid. When seeking, you should
1249 * start decoding this many samples prior to your desired seek point.
1250 *
1251 * - encoding: Set by libavcodec.
1252 * - decoding: Set by libavcodec.
1253 */
1254 int delay;
1255
1256
1257 /* video only */
1258 /**
1259 * picture width / height.
1260 * - encoding: MUST be set by user.
1261 * - decoding: May be set by the user before opening the decoder if known e.g.
1262 * from the container. Some decoders will require the dimensions
1263 * to be set by the caller. During decoding, the decoder may
1264 * overwrite those values as required.
1265 */
1266 int width, height;
1267
1268 /**
1269 * Bitstream width / height, may be different from width/height e.g. when
1270 * the decoded frame is cropped before being output.
1271 * - encoding: unused
1272 * - decoding: May be set by the user before opening the decoder if known
1273 * e.g. from the container. During decoding, the decoder may
1274 * overwrite those values as required.
1275 */
1276 int coded_width, coded_height;
1277
1278 #if FF_API_ASPECT_EXTENDED
1279 #define FF_ASPECT_EXTENDED 15
1280 #endif
1281
1282 /**
1283 * the number of pictures in a group of pictures, or 0 for intra_only
1284 * - encoding: Set by user.
1285 * - decoding: unused
1286 */
1287 int gop_size;
1288
1289 /**
1290 * Pixel format, see AV_PIX_FMT_xxx.
1291 * May be set by the demuxer if known from headers.
1292 * May be overriden by the decoder if it knows better.
1293 * - encoding: Set by user.
1294 * - decoding: Set by user if known, overridden by libavcodec if known
1295 */
1296 enum AVPixelFormat pix_fmt;
1297
1298 /**
1299 * Motion estimation algorithm used for video coding.
1300 * 1 (zero), 2 (full), 3 (log), 4 (phods), 5 (epzs), 6 (x1), 7 (hex),
1301 * 8 (umh), 10 (tesa) [7, 8, 10 are x264 specific]
1302 * - encoding: MUST be set by user.
1303 * - decoding: unused
1304 */
1305 int me_method;
1306
1307 /**
1308 * If non NULL, 'draw_horiz_band' is called by the libavcodec
1309 * decoder to draw a horizontal band. It improves cache usage. Not
1310 * all codecs can do that. You must check the codec capabilities
1311 * beforehand.
1312 * When multithreading is used, it may be called from multiple threads
1313 * at the same time; threads might draw different parts of the same AVFrame,
1314 * or multiple AVFrames, and there is no guarantee that slices will be drawn
1315 * in order.
1316 * The function is also used by hardware acceleration APIs.
1317 * It is called at least once during frame decoding to pass
1318 * the data needed for hardware render.
1319 * In that mode instead of pixel data, AVFrame points to
1320 * a structure specific to the acceleration API. The application
1321 * reads the structure and can change some fields to indicate progress
1322 * or mark state.
1323 * - encoding: unused
1324 * - decoding: Set by user.
1325 * @param height the height of the slice
1326 * @param y the y position of the slice
1327 * @param type 1->top field, 2->bottom field, 3->frame
1328 * @param offset offset into the AVFrame.data from which the slice should be read
1329 */
1330 void (*draw_horiz_band)(struct AVCodecContext *s,
1331 const AVFrame *src, int offset[AV_NUM_DATA_POINTERS],
1332 int y, int type, int height);
1333
1334 /**
1335 * callback to negotiate the pixelFormat
1336 * @param fmt is the list of formats which are supported by the codec,
1337 * it is terminated by -1 as 0 is a valid format, the formats are ordered by quality.
1338 * The first is always the native one.
1339 * @return the chosen format
1340 * - encoding: unused
1341 * - decoding: Set by user, if not set the native format will be chosen.
1342 */
1343 enum AVPixelFormat (*get_format)(struct AVCodecContext *s, const enum AVPixelFormat * fmt);
1344
1345 /**
1346 * maximum number of B-frames between non-B-frames
1347 * Note: The output will be delayed by max_b_frames+1 relative to the input.
1348 * - encoding: Set by user.
1349 * - decoding: unused
1350 */
1351 int max_b_frames;
1352
1353 /**
1354 * qscale factor between IP and B-frames
1355 * If > 0 then the last P-frame quantizer will be used (q= lastp_q*factor+offset).
1356 * If < 0 then normal ratecontrol will be done (q= -normal_q*factor+offset).
1357 * - encoding: Set by user.
1358 * - decoding: unused
1359 */
1360 float b_quant_factor;
1361
1362 /** obsolete FIXME remove */
1363 int rc_strategy;
1364 #define FF_RC_STRATEGY_XVID 1
1365
1366 int b_frame_strategy;
1367
1368 /**
1369 * qscale offset between IP and B-frames
1370 * - encoding: Set by user.
1371 * - decoding: unused
1372 */
1373 float b_quant_offset;
1374
1375 /**
1376 * Size of the frame reordering buffer in the decoder.
1377 * For MPEG-2 it is 1 IPB or 0 low delay IP.
1378 * - encoding: Set by libavcodec.
1379 * - decoding: Set by libavcodec.
1380 */
1381 int has_b_frames;
1382
1383 /**
1384 * 0-> h263 quant 1-> mpeg quant
1385 * - encoding: Set by user.
1386 * - decoding: unused
1387 */
1388 int mpeg_quant;
1389
1390 /**
1391 * qscale factor between P and I-frames
1392 * If > 0 then the last p frame quantizer will be used (q= lastp_q*factor+offset).
1393 * If < 0 then normal ratecontrol will be done (q= -normal_q*factor+offset).
1394 * - encoding: Set by user.
1395 * - decoding: unused
1396 */
1397 float i_quant_factor;
1398
1399 /**
1400 * qscale offset between P and I-frames
1401 * - encoding: Set by user.
1402 * - decoding: unused
1403 */
1404 float i_quant_offset;
1405
1406 /**
1407 * luminance masking (0-> disabled)
1408 * - encoding: Set by user.
1409 * - decoding: unused
1410 */
1411 float lumi_masking;
1412
1413 /**
1414 * temporary complexity masking (0-> disabled)
1415 * - encoding: Set by user.
1416 * - decoding: unused
1417 */
1418 float temporal_cplx_masking;
1419
1420 /**
1421 * spatial complexity masking (0-> disabled)
1422 * - encoding: Set by user.
1423 * - decoding: unused
1424 */
1425 float spatial_cplx_masking;
1426
1427 /**
1428 * p block masking (0-> disabled)
1429 * - encoding: Set by user.
1430 * - decoding: unused
1431 */
1432 float p_masking;
1433
1434 /**
1435 * darkness masking (0-> disabled)
1436 * - encoding: Set by user.
1437 * - decoding: unused
1438 */
1439 float dark_masking;
1440
1441 /**
1442 * slice count
1443 * - encoding: Set by libavcodec.
1444 * - decoding: Set by user (or 0).
1445 */
1446 int slice_count;
1447 /**
1448 * prediction method (needed for huffyuv)
1449 * - encoding: Set by user.
1450 * - decoding: unused
1451 */
1452 int prediction_method;
1453 #define FF_PRED_LEFT 0
1454 #define FF_PRED_PLANE 1
1455 #define FF_PRED_MEDIAN 2
1456
1457 /**
1458 * slice offsets in the frame in bytes
1459 * - encoding: Set/allocated by libavcodec.
1460 * - decoding: Set/allocated by user (or NULL).
1461 */
1462 int *slice_offset;
1463
1464 /**
1465 * sample aspect ratio (0 if unknown)
1466 * That is the width of a pixel divided by the height of the pixel.
1467 * Numerator and denominator must be relatively prime and smaller than 256 for some video standards.
1468 * - encoding: Set by user.
1469 * - decoding: Set by libavcodec.
1470 */
1471 AVRational sample_aspect_ratio;
1472
1473 /**
1474 * motion estimation comparison function
1475 * - encoding: Set by user.
1476 * - decoding: unused
1477 */
1478 int me_cmp;
1479 /**
1480 * subpixel motion estimation comparison function
1481 * - encoding: Set by user.
1482 * - decoding: unused
1483 */
1484 int me_sub_cmp;
1485 /**
1486 * macroblock comparison function (not supported yet)
1487 * - encoding: Set by user.
1488 * - decoding: unused
1489 */
1490 int mb_cmp;
1491 /**
1492 * interlaced DCT comparison function
1493 * - encoding: Set by user.
1494 * - decoding: unused
1495 */
1496 int ildct_cmp;
1497 #define FF_CMP_SAD 0
1498 #define FF_CMP_SSE 1
1499 #define FF_CMP_SATD 2
1500 #define FF_CMP_DCT 3
1501 #define FF_CMP_PSNR 4
1502 #define FF_CMP_BIT 5
1503 #define FF_CMP_RD 6
1504 #define FF_CMP_ZERO 7
1505 #define FF_CMP_VSAD 8
1506 #define FF_CMP_VSSE 9
1507 #define FF_CMP_NSSE 10
1508 #define FF_CMP_DCTMAX 13
1509 #define FF_CMP_DCT264 14
1510 #define FF_CMP_CHROMA 256
1511
1512 /**
1513 * ME diamond size & shape
1514 * - encoding: Set by user.
1515 * - decoding: unused
1516 */
1517 int dia_size;
1518
1519 /**
1520 * amount of previous MV predictors (2a+1 x 2a+1 square)
1521 * - encoding: Set by user.
1522 * - decoding: unused
1523 */
1524 int last_predictor_count;
1525
1526 /**
1527 * prepass for motion estimation
1528 * - encoding: Set by user.
1529 * - decoding: unused
1530 */
1531 int pre_me;
1532
1533 /**
1534 * motion estimation prepass comparison function
1535 * - encoding: Set by user.
1536 * - decoding: unused
1537 */
1538 int me_pre_cmp;
1539
1540 /**
1541 * ME prepass diamond size & shape
1542 * - encoding: Set by user.
1543 * - decoding: unused
1544 */
1545 int pre_dia_size;
1546
1547 /**
1548 * subpel ME quality
1549 * - encoding: Set by user.
1550 * - decoding: unused
1551 */
1552 int me_subpel_quality;
1553
1554 /**
1555 * DTG active format information (additional aspect ratio
1556 * information only used in DVB MPEG-2 transport streams)
1557 * 0 if not set.
1558 *
1559 * - encoding: unused
1560 * - decoding: Set by decoder.
1561 */
1562 int dtg_active_format;
1563 #define FF_DTG_AFD_SAME 8
1564 #define FF_DTG_AFD_4_3 9
1565 #define FF_DTG_AFD_16_9 10
1566 #define FF_DTG_AFD_14_9 11
1567 #define FF_DTG_AFD_4_3_SP_14_9 13
1568 #define FF_DTG_AFD_16_9_SP_14_9 14
1569 #define FF_DTG_AFD_SP_4_3 15
1570
1571 /**
1572 * maximum motion estimation search range in subpel units
1573 * If 0 then no limit.
1574 *
1575 * - encoding: Set by user.
1576 * - decoding: unused
1577 */
1578 int me_range;
1579
1580 /**
1581 * intra quantizer bias
1582 * - encoding: Set by user.
1583 * - decoding: unused
1584 */
1585 int intra_quant_bias;
1586 #define FF_DEFAULT_QUANT_BIAS 999999
1587
1588 /**
1589 * inter quantizer bias
1590 * - encoding: Set by user.
1591 * - decoding: unused
1592 */
1593 int inter_quant_bias;
1594
1595 /**
1596 * slice flags
1597 * - encoding: unused
1598 * - decoding: Set by user.
1599 */
1600 int slice_flags;
1601 #define SLICE_FLAG_CODED_ORDER 0x0001 ///< draw_horiz_band() is called in coded order instead of display
1602 #define SLICE_FLAG_ALLOW_FIELD 0x0002 ///< allow draw_horiz_band() with field slices (MPEG2 field pics)
1603 #define SLICE_FLAG_ALLOW_PLANE 0x0004 ///< allow draw_horiz_band() with 1 component at a time (SVQ1)
1604
1605 #if FF_API_XVMC
1606 /**
1607 * XVideo Motion Acceleration
1608 * - encoding: forbidden
1609 * - decoding: set by decoder
1610 * @deprecated XvMC support is slated for removal.
1611 */
1612 attribute_deprecated int xvmc_acceleration;
1613 #endif /* FF_API_XVMC */
1614
1615 /**
1616 * macroblock decision mode
1617 * - encoding: Set by user.
1618 * - decoding: unused
1619 */
1620 int mb_decision;
1621 #define FF_MB_DECISION_SIMPLE 0 ///< uses mb_cmp
1622 #define FF_MB_DECISION_BITS 1 ///< chooses the one which needs the fewest bits
1623 #define FF_MB_DECISION_RD 2 ///< rate distortion
1624
1625 /**
1626 * custom intra quantization matrix
1627 * - encoding: Set by user, can be NULL.
1628 * - decoding: Set by libavcodec.
1629 */
1630 uint16_t *intra_matrix;
1631
1632 /**
1633 * custom inter quantization matrix
1634 * - encoding: Set by user, can be NULL.
1635 * - decoding: Set by libavcodec.
1636 */
1637 uint16_t *inter_matrix;
1638
1639 /**
1640 * scene change detection threshold
1641 * 0 is default, larger means fewer detected scene changes.
1642 * - encoding: Set by user.
1643 * - decoding: unused
1644 */
1645 int scenechange_threshold;
1646
1647 /**
1648 * noise reduction strength
1649 * - encoding: Set by user.
1650 * - decoding: unused
1651 */
1652 int noise_reduction;
1653
1654 /**
1655 * Motion estimation threshold below which no motion estimation is
1656 * performed, but instead the user specified motion vectors are used.
1657 *
1658 * - encoding: Set by user.
1659 * - decoding: unused
1660 */
1661 int me_threshold;
1662
1663 /**
1664 * Macroblock threshold below which the user specified macroblock types will be used.
1665 * - encoding: Set by user.
1666 * - decoding: unused
1667 */
1668 int mb_threshold;
1669
1670 /**
1671 * precision of the intra DC coefficient - 8
1672 * - encoding: Set by user.
1673 * - decoding: unused
1674 */
1675 int intra_dc_precision;
1676
1677 /**
1678 * Number of macroblock rows at the top which are skipped.
1679 * - encoding: unused
1680 * - decoding: Set by user.
1681 */
1682 int skip_top;
1683
1684 /**
1685 * Number of macroblock rows at the bottom which are skipped.
1686 * - encoding: unused
1687 * - decoding: Set by user.
1688 */
1689 int skip_bottom;
1690
1691 /**
1692 * Border processing masking, raises the quantizer for mbs on the borders
1693 * of the picture.
1694 * - encoding: Set by user.
1695 * - decoding: unused
1696 */
1697 float border_masking;
1698
1699 /**
1700 * minimum MB lagrange multipler
1701 * - encoding: Set by user.
1702 * - decoding: unused
1703 */
1704 int mb_lmin;
1705
1706 /**
1707 * maximum MB lagrange multipler
1708 * - encoding: Set by user.
1709 * - decoding: unused
1710 */
1711 int mb_lmax;
1712
1713 /**
1714 *
1715 * - encoding: Set by user.
1716 * - decoding: unused
1717 */
1718 int me_penalty_compensation;
1719
1720 /**
1721 *
1722 * - encoding: Set by user.
1723 * - decoding: unused
1724 */
1725 int bidir_refine;
1726
1727 /**
1728 *
1729 * - encoding: Set by user.
1730 * - decoding: unused
1731 */
1732 int brd_scale;
1733
1734 /**
1735 * minimum GOP size
1736 * - encoding: Set by user.
1737 * - decoding: unused
1738 */
1739 int keyint_min;
1740
1741 /**
1742 * number of reference frames
1743 * - encoding: Set by user.
1744 * - decoding: Set by lavc.
1745 */
1746 int refs;
1747
1748 /**
1749 * chroma qp offset from luma
1750 * - encoding: Set by user.
1751 * - decoding: unused
1752 */
1753 int chromaoffset;
1754
1755 /**
1756 * Multiplied by qscale for each frame and added to scene_change_score.
1757 * - encoding: Set by user.
1758 * - decoding: unused
1759 */
1760 int scenechange_factor;
1761
1762 /**
1763 *
1764 * Note: Value depends upon the compare function used for fullpel ME.
1765 * - encoding: Set by user.
1766 * - decoding: unused
1767 */
1768 int mv0_threshold;
1769
1770 /**
1771 * Adjust sensitivity of b_frame_strategy 1.
1772 * - encoding: Set by user.
1773 * - decoding: unused
1774 */
1775 int b_sensitivity;
1776
1777 /**
1778 * Chromaticity coordinates of the source primaries.
1779 * - encoding: Set by user
1780 * - decoding: Set by libavcodec
1781 */
1782 enum AVColorPrimaries color_primaries;
1783
1784 /**
1785 * Color Transfer Characteristic.
1786 * - encoding: Set by user
1787 * - decoding: Set by libavcodec
1788 */
1789 enum AVColorTransferCharacteristic color_trc;
1790
1791 /**
1792 * YUV colorspace type.
1793 * - encoding: Set by user
1794 * - decoding: Set by libavcodec
1795 */
1796 enum AVColorSpace colorspace;
1797
1798 /**
1799 * MPEG vs JPEG YUV range.
1800 * - encoding: Set by user
1801 * - decoding: Set by libavcodec
1802 */
1803 enum AVColorRange color_range;
1804
1805 /**
1806 * This defines the location of chroma samples.
1807 * - encoding: Set by user
1808 * - decoding: Set by libavcodec
1809 */
1810 enum AVChromaLocation chroma_sample_location;
1811
1812 /**
1813 * Number of slices.
1814 * Indicates number of picture subdivisions. Used for parallelized
1815 * decoding.
1816 * - encoding: Set by user
1817 * - decoding: unused
1818 */
1819 int slices;
1820
1821 /** Field order
1822 * - encoding: set by libavcodec
1823 * - decoding: Set by libavcodec
1824 */
1825 enum AVFieldOrder field_order;
1826
1827 /* audio only */
1828 int sample_rate; ///< samples per second
1829 int channels; ///< number of audio channels
1830
1831 /**
1832 * audio sample format
1833 * - encoding: Set by user.
1834 * - decoding: Set by libavcodec.
1835 */
1836 enum AVSampleFormat sample_fmt; ///< sample format
1837
1838 /* The following data should not be initialized. */
1839 /**
1840 * Number of samples per channel in an audio frame.
1841 *
1842 * - encoding: set by libavcodec in avcodec_open2(). Each submitted frame
1843 * except the last must contain exactly frame_size samples per channel.
1844 * May be 0 when the codec has CODEC_CAP_VARIABLE_FRAME_SIZE set, then the
1845 * frame size is not restricted.
1846 * - decoding: may be set by some decoders to indicate constant frame size
1847 */
1848 int frame_size;
1849
1850 /**
1851 * Frame counter, set by libavcodec.
1852 *
1853 * - decoding: total number of frames returned from the decoder so far.
1854 * - encoding: total number of frames passed to the encoder so far.
1855 *
1856 * @note the counter is not incremented if encoding/decoding resulted in
1857 * an error.
1858 */
1859 int frame_number;
1860
1861 /**
1862 * number of bytes per packet if constant and known or 0
1863 * Used by some WAV based audio codecs.
1864 */
1865 int block_align;
1866
1867 /**
1868 * Audio cutoff bandwidth (0 means "automatic")
1869 * - encoding: Set by user.
1870 * - decoding: unused
1871 */
1872 int cutoff;
1873
1874 #if FF_API_REQUEST_CHANNELS
1875 /**
1876 * Decoder should decode to this many channels if it can (0 for default)
1877 * - encoding: unused
1878 * - decoding: Set by user.
1879 * @deprecated Deprecated in favor of request_channel_layout.
1880 */
1881 attribute_deprecated int request_channels;
1882 #endif
1883
1884 /**
1885 * Audio channel layout.
1886 * - encoding: set by user.
1887 * - decoding: set by libavcodec.
1888 */
1889 uint64_t channel_layout;
1890
1891 /**
1892 * Request decoder to use this channel layout if it can (0 for default)
1893 * - encoding: unused
1894 * - decoding: Set by user.
1895 */
1896 uint64_t request_channel_layout;
1897
1898 /**
1899 * Type of service that the audio stream conveys.
1900 * - encoding: Set by user.
1901 * - decoding: Set by libavcodec.
1902 */
1903 enum AVAudioServiceType audio_service_type;
1904
1905 /**
1906 * Used to request a sample format from the decoder.
1907 * - encoding: unused.
1908 * - decoding: Set by user.
1909 */
1910 enum AVSampleFormat request_sample_fmt;
1911
1912 #if FF_API_GET_BUFFER
1913 /**
1914 * Called at the beginning of each frame to get a buffer for it.
1915 *
1916 * The function will set AVFrame.data[], AVFrame.linesize[].
1917 * AVFrame.extended_data[] must also be set, but it should be the same as
1918 * AVFrame.data[] except for planar audio with more channels than can fit
1919 * in AVFrame.data[]. In that case, AVFrame.data[] shall still contain as
1920 * many data pointers as it can hold.
1921 *
1922 * if CODEC_CAP_DR1 is not set then get_buffer() must call
1923 * avcodec_default_get_buffer() instead of providing buffers allocated by
1924 * some other means.
1925 *
1926 * AVFrame.data[] should be 32- or 16-byte-aligned unless the CPU doesn't
1927 * need it. avcodec_default_get_buffer() aligns the output buffer properly,
1928 * but if get_buffer() is overridden then alignment considerations should
1929 * be taken into account.
1930 *
1931 * @see avcodec_default_get_buffer()
1932 *
1933 * Video:
1934 *
1935 * If pic.reference is set then the frame will be read later by libavcodec.
1936 * avcodec_align_dimensions2() should be used to find the required width and
1937 * height, as they normally need to be rounded up to the next multiple of 16.
1938 *
1939 * If frame multithreading is used and thread_safe_callbacks is set,
1940 * it may be called from a different thread, but not from more than one at
1941 * once. Does not need to be reentrant.
1942 *
1943 * @see release_buffer(), reget_buffer()
1944 * @see avcodec_align_dimensions2()
1945 *
1946 * Audio:
1947 *
1948 * Decoders request a buffer of a particular size by setting
1949 * AVFrame.nb_samples prior to calling get_buffer(). The decoder may,
1950 * however, utilize only part of the buffer by setting AVFrame.nb_samples
1951 * to a smaller value in the output frame.
1952 *
1953 * Decoders cannot use the buffer after returning from
1954 * avcodec_decode_audio4(), so they will not call release_buffer(), as it
1955 * is assumed to be released immediately upon return. In some rare cases,
1956 * a decoder may need to call get_buffer() more than once in a single
1957 * call to avcodec_decode_audio4(). In that case, when get_buffer() is
1958 * called again after it has already been called once, the previously
1959 * acquired buffer is assumed to be released at that time and may not be
1960 * reused by the decoder.
1961 *
1962 * As a convenience, av_samples_get_buffer_size() and
1963 * av_samples_fill_arrays() in libavutil may be used by custom get_buffer()
1964 * functions to find the required data size and to fill data pointers and
1965 * linesize. In AVFrame.linesize, only linesize[0] may be set for audio
1966 * since all planes must be the same size.
1967 *
1968 * @see av_samples_get_buffer_size(), av_samples_fill_arrays()
1969 *
1970 * - encoding: unused
1971 * - decoding: Set by libavcodec, user can override.
1972 *
1973 * @deprecated use get_buffer2()
1974 */
1975 attribute_deprecated
1976 int (*get_buffer)(struct AVCodecContext *c, AVFrame *pic);
1977
1978 /**
1979 * Called to release buffers which were allocated with get_buffer.
1980 * A released buffer can be reused in get_buffer().
1981 * pic.data[*] must be set to NULL.
1982 * May be called from a different thread if frame multithreading is used,
1983 * but not by more than one thread at once, so does not need to be reentrant.
1984 * - encoding: unused
1985 * - decoding: Set by libavcodec, user can override.
1986 *
1987 * @deprecated custom freeing callbacks should be set from get_buffer2()
1988 */
1989 attribute_deprecated
1990 void (*release_buffer)(struct AVCodecContext *c, AVFrame *pic);
1991
1992 /**
1993 * Called at the beginning of a frame to get cr buffer for it.
1994 * Buffer type (size, hints) must be the same. libavcodec won't check it.
1995 * libavcodec will pass previous buffer in pic, function should return
1996 * same buffer or new buffer with old frame "painted" into it.
1997 * If pic.data[0] == NULL must behave like get_buffer().
1998 * if CODEC_CAP_DR1 is not set then reget_buffer() must call
1999 * avcodec_default_reget_buffer() instead of providing buffers allocated by
2000 * some other means.
2001 * - encoding: unused
2002 * - decoding: Set by libavcodec, user can override.
2003 */
2004 attribute_deprecated
2005 int (*reget_buffer)(struct AVCodecContext *c, AVFrame *pic);
2006 #endif
2007
2008 /**
2009 * This callback is called at the beginning of each frame to get data
2010 * buffer(s) for it. There may be one contiguous buffer for all the data or
2011 * there may be a buffer per each data plane or anything in between. What
2012 * this means is, you may set however many entries in buf[] you feel necessary.
2013 * Each buffer must be reference-counted using the AVBuffer API (see description
2014 * of buf[] below).
2015 *
2016 * The following fields will be set in the frame before this callback is
2017 * called:
2018 * - format
2019 * - width, height (video only)
2020 * - sample_rate, channel_layout, nb_samples (audio only)
2021 * Their values may differ from the corresponding values in
2022 * AVCodecContext. This callback must use the frame values, not the codec
2023 * context values, to calculate the required buffer size.
2024 *
2025 * This callback must fill the following fields in the frame:
2026 * - data[]
2027 * - linesize[]
2028 * - extended_data:
2029 * * if the data is planar audio with more than 8 channels, then this
2030 * callback must allocate and fill extended_data to contain all pointers
2031 * to all data planes. data[] must hold as many pointers as it can.
2032 * extended_data must be allocated with av_malloc() and will be freed in
2033 * av_frame_unref().
2034 * * otherwise exended_data must point to data
2035 * - buf[] must contain one or more pointers to AVBufferRef structures. Each of
2036 * the frame's data and extended_data pointers must be contained in these. That
2037 * is, one AVBufferRef for each allocated chunk of memory, not necessarily one
2038 * AVBufferRef per data[] entry. See: av_buffer_create(), av_buffer_alloc(),
2039 * and av_buffer_ref().
2040 * - extended_buf and nb_extended_buf must be allocated with av_malloc() by
2041 * this callback and filled with the extra buffers if there are more
2042 * buffers than buf[] can hold. extended_buf will be freed in
2043 * av_frame_unref().
2044 *
2045 * If CODEC_CAP_DR1 is not set then get_buffer2() must call
2046 * avcodec_default_get_buffer2() instead of providing buffers allocated by
2047 * some other means.
2048 *
2049 * Each data plane must be aligned to the maximum required by the target
2050 * CPU.
2051 *
2052 * @see avcodec_default_get_buffer2()
2053 *
2054 * Video:
2055 *
2056 * If AV_GET_BUFFER_FLAG_REF is set in flags then the frame may be reused
2057 * (read and/or written to if it is writable) later by libavcodec.
2058 *
2059 * avcodec_align_dimensions2() should be used to find the required width and
2060 * height, as they normally need to be rounded up to the next multiple of 16.
2061 *
2062 * If frame multithreading is used and thread_safe_callbacks is set,
2063 * this callback may be called from a different thread, but not from more
2064 * than one at once. Does not need to be reentrant.
2065 *
2066 * @see avcodec_align_dimensions2()
2067 *
2068 * Audio:
2069 *
2070 * Decoders request a buffer of a particular size by setting
2071 * AVFrame.nb_samples prior to calling get_buffer2(). The decoder may,
2072 * however, utilize only part of the buffer by setting AVFrame.nb_samples
2073 * to a smaller value in the output frame.
2074 *
2075 * As a convenience, av_samples_get_buffer_size() and
2076 * av_samples_fill_arrays() in libavutil may be used by custom get_buffer2()
2077 * functions to find the required data size and to fill data pointers and
2078 * linesize. In AVFrame.linesize, only linesize[0] may be set for audio
2079 * since all planes must be the same size.
2080 *
2081 * @see av_samples_get_buffer_size(), av_samples_fill_arrays()
2082 *
2083 * - encoding: unused
2084 * - decoding: Set by libavcodec, user can override.
2085 */
2086 int (*get_buffer2)(struct AVCodecContext *s, AVFrame *frame, int flags);
2087
2088 /**
2089 * If non-zero, the decoded audio and video frames returned from
2090 * avcodec_decode_video2() and avcodec_decode_audio4() are reference-counted
2091 * and are valid indefinitely. The caller must free them with
2092 * av_frame_unref() when they are not needed anymore.
2093 * Otherwise, the decoded frames must not be freed by the caller and are
2094 * only valid until the next decode call.
2095 *
2096 * - encoding: unused
2097 * - decoding: set by the caller before avcodec_open2().
2098 */
2099 int refcounted_frames;
2100
2101 /* - encoding parameters */
2102 float qcompress; ///< amount of qscale change between easy & hard scenes (0.0-1.0)
2103 float qblur; ///< amount of qscale smoothing over time (0.0-1.0)
2104
2105 /**
2106 * minimum quantizer
2107 * - encoding: Set by user.
2108 * - decoding: unused
2109 */
2110 int qmin;
2111
2112 /**
2113 * maximum quantizer
2114 * - encoding: Set by user.
2115 * - decoding: unused
2116 */
2117 int qmax;
2118
2119 /**
2120 * maximum quantizer difference between frames
2121 * - encoding: Set by user.
2122 * - decoding: unused
2123 */
2124 int max_qdiff;
2125
2126 /**
2127 * ratecontrol qmin qmax limiting method
2128 * 0-> clipping, 1-> use a nice continuous function to limit qscale wthin qmin/qmax.
2129 * - encoding: Set by user.
2130 * - decoding: unused
2131 */
2132 float rc_qsquish;
2133
2134 float rc_qmod_amp;
2135 int rc_qmod_freq;
2136
2137 /**
2138 * decoder bitstream buffer size
2139 * - encoding: Set by user.
2140 * - decoding: unused
2141 */
2142 int rc_buffer_size;
2143
2144 /**
2145 * ratecontrol override, see RcOverride
2146 * - encoding: Allocated/set/freed by user.
2147 * - decoding: unused
2148 */
2149 int rc_override_count;
2150 RcOverride *rc_override;
2151
2152 /**
2153 * rate control equation
2154 * - encoding: Set by user
2155 * - decoding: unused
2156 */
2157 const char *rc_eq;
2158
2159 /**
2160 * maximum bitrate
2161 * - encoding: Set by user.
2162 * - decoding: unused
2163 */
2164 int rc_max_rate;
2165
2166 /**
2167 * minimum bitrate
2168 * - encoding: Set by user.
2169 * - decoding: unused
2170 */
2171 int rc_min_rate;
2172
2173 float rc_buffer_aggressivity;
2174
2175 /**
2176 * initial complexity for pass1 ratecontrol
2177 * - encoding: Set by user.
2178 * - decoding: unused
2179 */
2180 float rc_initial_cplx;
2181
2182 /**
2183 * Ratecontrol attempt to use, at maximum, <value> of what can be used without an underflow.
2184 * - encoding: Set by user.
2185 * - decoding: unused.
2186 */
2187 float rc_max_available_vbv_use;
2188
2189 /**
2190 * Ratecontrol attempt to use, at least, <value> times the amount needed to prevent a vbv overflow.
2191 * - encoding: Set by user.
2192 * - decoding: unused.
2193 */
2194 float rc_min_vbv_overflow_use;
2195
2196 /**
2197 * Number of bits which should be loaded into the rc buffer before decoding starts.
2198 * - encoding: Set by user.
2199 * - decoding: unused
2200 */
2201 int rc_initial_buffer_occupancy;
2202
2203 #define FF_CODER_TYPE_VLC 0
2204 #define FF_CODER_TYPE_AC 1
2205 #define FF_CODER_TYPE_RAW 2
2206 #define FF_CODER_TYPE_RLE 3
2207 #define FF_CODER_TYPE_DEFLATE 4
2208 /**
2209 * coder type
2210 * - encoding: Set by user.
2211 * - decoding: unused
2212 */
2213 int coder_type;
2214
2215 /**
2216 * context model
2217 * - encoding: Set by user.
2218 * - decoding: unused
2219 */
2220 int context_model;
2221
2222 /**
2223 * minimum Lagrange multipler
2224 * - encoding: Set by user.
2225 * - decoding: unused
2226 */
2227 int lmin;
2228
2229 /**
2230 * maximum Lagrange multipler
2231 * - encoding: Set by user.
2232 * - decoding: unused
2233 */
2234 int lmax;
2235
2236 /**
2237 * frame skip threshold
2238 * - encoding: Set by user.
2239 * - decoding: unused
2240 */
2241 int frame_skip_threshold;
2242
2243 /**
2244 * frame skip factor
2245 * - encoding: Set by user.
2246 * - decoding: unused
2247 */
2248 int frame_skip_factor;
2249
2250 /**
2251 * frame skip exponent
2252 * - encoding: Set by user.
2253 * - decoding: unused
2254 */
2255 int frame_skip_exp;
2256
2257 /**
2258 * frame skip comparison function
2259 * - encoding: Set by user.
2260 * - decoding: unused
2261 */
2262 int frame_skip_cmp;
2263
2264 /**
2265 * trellis RD quantization
2266 * - encoding: Set by user.
2267 * - decoding: unused
2268 */
2269 int trellis;
2270
2271 /**
2272 * - encoding: Set by user.
2273 * - decoding: unused
2274 */
2275 int min_prediction_order;
2276
2277 /**
2278 * - encoding: Set by user.
2279 * - decoding: unused
2280 */
2281 int max_prediction_order;
2282
2283 /**
2284 * GOP timecode frame start number, in non drop frame format
2285 * - encoding: Set by user.
2286 * - decoding: unused
2287 */
2288 int64_t timecode_frame_start;
2289
2290 /* The RTP callback: This function is called */
2291 /* every time the encoder has a packet to send. */
2292 /* It depends on the encoder if the data starts */
2293 /* with a Start Code (it should). H.263 does. */
2294 /* mb_nb contains the number of macroblocks */
2295 /* encoded in the RTP payload. */
2296 void (*rtp_callback)(struct AVCodecContext *avctx, void *data, int size, int mb_nb);
2297
2298 int rtp_payload_size; /* The size of the RTP payload: the coder will */
2299 /* do its best to deliver a chunk with size */
2300 /* below rtp_payload_size, the chunk will start */
2301 /* with a start code on some codecs like H.263. */
2302 /* This doesn't take account of any particular */
2303 /* headers inside the transmitted RTP payload. */
2304
2305 /* statistics, used for 2-pass encoding */
2306 int mv_bits;
2307 int header_bits;
2308 int i_tex_bits;
2309 int p_tex_bits;
2310 int i_count;
2311 int p_count;
2312 int skip_count;
2313 int misc_bits;
2314
2315 /**
2316 * number of bits used for the previously encoded frame
2317 * - encoding: Set by libavcodec.
2318 * - decoding: unused
2319 */
2320 int frame_bits;
2321
2322 /**
2323 * pass1 encoding statistics output buffer
2324 * - encoding: Set by libavcodec.
2325 * - decoding: unused
2326 */
2327 char *stats_out;
2328
2329 /**
2330 * pass2 encoding statistics input buffer
2331 * Concatenated stuff from stats_out of pass1 should be placed here.
2332 * - encoding: Allocated/set/freed by user.
2333 * - decoding: unused
2334 */
2335 char *stats_in;
2336
2337 /**
2338 * Work around bugs in encoders which sometimes cannot be detected automatically.
2339 * - encoding: Set by user
2340 * - decoding: Set by user
2341 */
2342 int workaround_bugs;
2343 #define FF_BUG_AUTODETECT 1 ///< autodetection
2344 #if FF_API_OLD_MSMPEG4
2345 #define FF_BUG_OLD_MSMPEG4 2
2346 #endif
2347 #define FF_BUG_XVID_ILACE 4
2348 #define FF_BUG_UMP4 8
2349 #define FF_BUG_NO_PADDING 16
2350 #define FF_BUG_AMV 32
2351 #if FF_API_AC_VLC
2352 #define FF_BUG_AC_VLC 0 ///< Will be removed, libavcodec can now handle these non-compliant files by default.
2353 #endif
2354 #define FF_BUG_QPEL_CHROMA 64
2355 #define FF_BUG_STD_QPEL 128
2356 #define FF_BUG_QPEL_CHROMA2 256
2357 #define FF_BUG_DIRECT_BLOCKSIZE 512
2358 #define FF_BUG_EDGE 1024
2359 #define FF_BUG_HPEL_CHROMA 2048
2360 #define FF_BUG_DC_CLIP 4096
2361 #define FF_BUG_MS 8192 ///< Work around various bugs in Microsoft's broken decoders.
2362 #define FF_BUG_TRUNCATED 16384
2363
2364 /**
2365 * strictly follow the standard (MPEG4, ...).
2366 * - encoding: Set by user.
2367 * - decoding: Set by user.
2368 * Setting this to STRICT or higher means the encoder and decoder will
2369 * generally do stupid things, whereas setting it to unofficial or lower
2370 * will mean the encoder might produce output that is not supported by all
2371 * spec-compliant decoders. Decoders don't differentiate between normal,
2372 * unofficial and experimental (that is, they always try to decode things
2373 * when they can) unless they are explicitly asked to behave stupidly
2374 * (=strictly conform to the specs)
2375 */
2376 int strict_std_compliance;
2377 #define FF_COMPLIANCE_VERY_STRICT 2 ///< Strictly conform to an older more strict version of the spec or reference software.
2378 #define FF_COMPLIANCE_STRICT 1 ///< Strictly conform to all the things in the spec no matter what consequences.
2379 #define FF_COMPLIANCE_NORMAL 0
2380 #define FF_COMPLIANCE_UNOFFICIAL -1 ///< Allow unofficial extensions
2381 #define FF_COMPLIANCE_EXPERIMENTAL -2 ///< Allow nonstandardized experimental things.
2382
2383 /**
2384 * error concealment flags
2385 * - encoding: unused
2386 * - decoding: Set by user.
2387 */
2388 int error_concealment;
2389 #define FF_EC_GUESS_MVS 1
2390 #define FF_EC_DEBLOCK 2
2391
2392 /**
2393 * debug
2394 * - encoding: Set by user.
2395 * - decoding: Set by user.
2396 */
2397 int debug;
2398 #define FF_DEBUG_PICT_INFO 1
2399 #define FF_DEBUG_RC 2
2400 #define FF_DEBUG_BITSTREAM 4
2401 #define FF_DEBUG_MB_TYPE 8
2402 #define FF_DEBUG_QP 16
2403 #if FF_API_DEBUG_MV
2404 /**
2405 * @deprecated this option does nothing
2406 */
2407 #define FF_DEBUG_MV 32
2408 #endif
2409 #define FF_DEBUG_DCT_COEFF 0x00000040
2410 #define FF_DEBUG_SKIP 0x00000080
2411 #define FF_DEBUG_STARTCODE 0x00000100
2412 #define FF_DEBUG_PTS 0x00000200
2413 #define FF_DEBUG_ER 0x00000400
2414 #define FF_DEBUG_MMCO 0x00000800
2415 #define FF_DEBUG_BUGS 0x00001000
2416 #if FF_API_DEBUG_MV
2417 #define FF_DEBUG_VIS_QP 0x00002000
2418 #define FF_DEBUG_VIS_MB_TYPE 0x00004000
2419 #endif
2420 #define FF_DEBUG_BUFFERS 0x00008000
2421 #define FF_DEBUG_THREADS 0x00010000
2422
2423 #if FF_API_DEBUG_MV
2424 /**
2425 * @deprecated this option does not have any effect
2426 */
2427 attribute_deprecated
2428 int debug_mv;
2429 #define FF_DEBUG_VIS_MV_P_FOR 0x00000001 //visualize forward predicted MVs of P frames
2430 #define FF_DEBUG_VIS_MV_B_FOR 0x00000002 //visualize forward predicted MVs of B frames
2431 #define FF_DEBUG_VIS_MV_B_BACK 0x00000004 //visualize backward predicted MVs of B frames
2432 #endif
2433
2434 /**
2435 * Error recognition; may misdetect some more or less valid parts as errors.
2436 * - encoding: unused
2437 * - decoding: Set by user.
2438 */
2439 int err_recognition;
2440
2441 /**
2442 * Verify checksums embedded in the bitstream (could be of either encoded or
2443 * decoded data, depending on the codec) and print an error message on mismatch.
2444 * If AV_EF_EXPLODE is also set, a mismatching checksum will result in the
2445 * decoder returning an error.
2446 */
2447 #define AV_EF_CRCCHECK (1<<0)
2448 #define AV_EF_BITSTREAM (1<<1)
2449 #define AV_EF_BUFFER (1<<2)
2450 #define AV_EF_EXPLODE (1<<3)
2451
2452 /**
2453 * opaque 64bit number (generally a PTS) that will be reordered and
2454 * output in AVFrame.reordered_opaque
2455 * @deprecated in favor of pkt_pts
2456 * - encoding: unused
2457 * - decoding: Set by user.
2458 */
2459 int64_t reordered_opaque;
2460
2461 /**
2462 * Hardware accelerator in use
2463 * - encoding: unused.
2464 * - decoding: Set by libavcodec
2465 */
2466 struct AVHWAccel *hwaccel;
2467
2468 /**
2469 * Hardware accelerator context.
2470 * For some hardware accelerators, a global context needs to be
2471 * provided by the user. In that case, this holds display-dependent
2472 * data Libav cannot instantiate itself. Please refer to the
2473 * Libav HW accelerator documentation to know how to fill this
2474 * is. e.g. for VA API, this is a struct vaapi_context.
2475 * - encoding: unused
2476 * - decoding: Set by user
2477 */
2478 void *hwaccel_context;
2479
2480 /**
2481 * error
2482 * - encoding: Set by libavcodec if flags&CODEC_FLAG_PSNR.
2483 * - decoding: unused
2484 */
2485 uint64_t error[AV_NUM_DATA_POINTERS];
2486
2487 /**
2488 * DCT algorithm, see FF_DCT_* below
2489 * - encoding: Set by user.
2490 * - decoding: unused
2491 */
2492 int dct_algo;
2493 #define FF_DCT_AUTO 0
2494 #define FF_DCT_FASTINT 1
2495 #define FF_DCT_INT 2
2496 #define FF_DCT_MMX 3
2497 #define FF_DCT_ALTIVEC 5
2498 #define FF_DCT_FAAN 6
2499
2500 /**
2501 * IDCT algorithm, see FF_IDCT_* below.
2502 * - encoding: Set by user.
2503 * - decoding: Set by user.
2504 */
2505 int idct_algo;
2506 #define FF_IDCT_AUTO 0
2507 #define FF_IDCT_INT 1
2508 #define FF_IDCT_SIMPLE 2
2509 #define FF_IDCT_SIMPLEMMX 3
2510 #define FF_IDCT_ARM 7
2511 #define FF_IDCT_ALTIVEC 8
2512 #if FF_API_ARCH_SH4
2513 #define FF_IDCT_SH4 9
2514 #endif
2515 #define FF_IDCT_SIMPLEARM 10
2516 #define FF_IDCT_IPP 13
2517 #define FF_IDCT_XVIDMMX 14
2518 #define FF_IDCT_SIMPLEARMV5TE 16
2519 #define FF_IDCT_SIMPLEARMV6 17
2520 #if FF_API_ARCH_SPARC
2521 #define FF_IDCT_SIMPLEVIS 18
2522 #endif
2523 #define FF_IDCT_FAAN 20
2524 #define FF_IDCT_SIMPLENEON 22
2525 #if FF_API_ARCH_ALPHA
2526 #define FF_IDCT_SIMPLEALPHA 23
2527 #endif
2528
2529 /**
2530 * bits per sample/pixel from the demuxer (needed for huffyuv).
2531 * - encoding: Set by libavcodec.
2532 * - decoding: Set by user.
2533 */
2534 int bits_per_coded_sample;
2535
2536 /**
2537 * Bits per sample/pixel of internal libavcodec pixel/sample format.
2538 * - encoding: set by user.
2539 * - decoding: set by libavcodec.
2540 */
2541 int bits_per_raw_sample;
2542
2543 #if FF_API_LOWRES
2544 /**
2545 * low resolution decoding, 1-> 1/2 size, 2->1/4 size
2546 * - encoding: unused
2547 * - decoding: Set by user.
2548 *
2549 * @deprecated use decoder private options instead
2550 */
2551 attribute_deprecated int lowres;
2552 #endif
2553
2554 /**
2555 * the picture in the bitstream
2556 * - encoding: Set by libavcodec.
2557 * - decoding: unused
2558 */
2559 AVFrame *coded_frame;
2560
2561 /**
2562 * thread count
2563 * is used to decide how many independent tasks should be passed to execute()
2564 * - encoding: Set by user.
2565 * - decoding: Set by user.
2566 */
2567 int thread_count;
2568
2569 /**
2570 * Which multithreading methods to use.
2571 * Use of FF_THREAD_FRAME will increase decoding delay by one frame per thread,
2572 * so clients which cannot provide future frames should not use it.
2573 *
2574 * - encoding: Set by user, otherwise the default is used.
2575 * - decoding: Set by user, otherwise the default is used.
2576 */
2577 int thread_type;
2578 #define FF_THREAD_FRAME 1 ///< Decode more than one frame at once
2579 #define FF_THREAD_SLICE 2 ///< Decode more than one part of a single frame at once
2580
2581 /**
2582 * Which multithreading methods are in use by the codec.
2583 * - encoding: Set by libavcodec.
2584 * - decoding: Set by libavcodec.
2585 */
2586 int active_thread_type;
2587
2588 /**
2589 * Set by the client if its custom get_buffer() callback can be called
2590 * synchronously from another thread, which allows faster multithreaded decoding.
2591 * draw_horiz_band() will be called from other threads regardless of this setting.
2592 * Ignored if the default get_buffer() is used.
2593 * - encoding: Set by user.
2594 * - decoding: Set by user.
2595 */
2596 int thread_safe_callbacks;
2597
2598 /**
2599 * The codec may call this to execute several independent things.
2600 * It will return only after finishing all tasks.
2601 * The user may replace this with some multithreaded implementation,
2602 * the default implementation will execute the parts serially.
2603 * @param count the number of things to execute
2604 * - encoding: Set by libavcodec, user can override.
2605 * - decoding: Set by libavcodec, user can override.
2606 */
2607 int (*execute)(struct AVCodecContext *c, int (*func)(struct AVCodecContext *c2, void *arg), void *arg2, int *ret, int count, int size);
2608
2609 /**
2610 * The codec may call this to execute several independent things.
2611 * It will return only after finishing all tasks.
2612 * The user may replace this with some multithreaded implementation,
2613 * the default implementation will execute the parts serially.
2614 * Also see avcodec_thread_init and e.g. the --enable-pthread configure option.
2615 * @param c context passed also to func
2616 * @param count the number of things to execute
2617 * @param arg2 argument passed unchanged to func
2618 * @param ret return values of executed functions, must have space for "count" values. May be NULL.
2619 * @param func function that will be called count times, with jobnr from 0 to count-1.
2620 * threadnr will be in the range 0 to c->thread_count-1 < MAX_THREADS and so that no
2621 * two instances of func executing at the same time will have the same threadnr.
2622 * @return always 0 currently, but code should handle a future improvement where when any call to func
2623 * returns < 0 no further calls to func may be done and < 0 is returned.
2624 * - encoding: Set by libavcodec, user can override.
2625 * - decoding: Set by libavcodec, user can override.
2626 */
2627 int (*execute2)(struct AVCodecContext *c, int (*func)(struct AVCodecContext *c2, void *arg, int jobnr, int threadnr), void *arg2, int *ret, int count);
2628
2629 #if FF_API_THREAD_OPAQUE
2630 /**
2631 * @deprecated this field should not be used from outside of lavc
2632 */
2633 attribute_deprecated
2634 void *thread_opaque;
2635 #endif
2636
2637 /**
2638 * noise vs. sse weight for the nsse comparsion function
2639 * - encoding: Set by user.
2640 * - decoding: unused
2641 */
2642 int nsse_weight;
2643
2644 /**
2645 * profile
2646 * - encoding: Set by user.
2647 * - decoding: Set by libavcodec.
2648 */
2649 int profile;
2650 #define FF_PROFILE_UNKNOWN -99
2651 #define FF_PROFILE_RESERVED -100
2652
2653 #define FF_PROFILE_AAC_MAIN 0
2654 #define FF_PROFILE_AAC_LOW 1
2655 #define FF_PROFILE_AAC_SSR 2
2656 #define FF_PROFILE_AAC_LTP 3
2657 #define FF_PROFILE_AAC_HE 4
2658 #define FF_PROFILE_AAC_HE_V2 28
2659 #define FF_PROFILE_AAC_LD 22
2660 #define FF_PROFILE_AAC_ELD 38
2661 #define FF_PROFILE_MPEG2_AAC_LOW 128
2662 #define FF_PROFILE_MPEG2_AAC_HE 131
2663
2664 #define FF_PROFILE_DTS 20
2665 #define FF_PROFILE_DTS_ES 30
2666 #define FF_PROFILE_DTS_96_24 40
2667 #define FF_PROFILE_DTS_HD_HRA 50
2668 #define FF_PROFILE_DTS_HD_MA 60
2669
2670 #define FF_PROFILE_MPEG2_422 0
2671 #define FF_PROFILE_MPEG2_HIGH 1
2672 #define FF_PROFILE_MPEG2_SS 2
2673 #define FF_PROFILE_MPEG2_SNR_SCALABLE 3
2674 #define FF_PROFILE_MPEG2_MAIN 4
2675 #define FF_PROFILE_MPEG2_SIMPLE 5
2676
2677 #define FF_PROFILE_H264_CONSTRAINED (1<<9) // 8+1; constraint_set1_flag
2678 #define FF_PROFILE_H264_INTRA (1<<11) // 8+3; constraint_set3_flag
2679
2680 #define FF_PROFILE_H264_BASELINE 66
2681 #define FF_PROFILE_H264_CONSTRAINED_BASELINE (66|FF_PROFILE_H264_CONSTRAINED)
2682 #define FF_PROFILE_H264_MAIN 77
2683 #define FF_PROFILE_H264_EXTENDED 88
2684 #define FF_PROFILE_H264_HIGH 100
2685 #define FF_PROFILE_H264_HIGH_10 110
2686 #define FF_PROFILE_H264_HIGH_10_INTRA (110|FF_PROFILE_H264_INTRA)
2687 #define FF_PROFILE_H264_HIGH_422 122
2688 #define FF_PROFILE_H264_HIGH_422_INTRA (122|FF_PROFILE_H264_INTRA)
2689 #define FF_PROFILE_H264_HIGH_444 144
2690 #define FF_PROFILE_H264_HIGH_444_PREDICTIVE 244
2691 #define FF_PROFILE_H264_HIGH_444_INTRA (244|FF_PROFILE_H264_INTRA)
2692 #define FF_PROFILE_H264_CAVLC_444 44
2693
2694 #define FF_PROFILE_VC1_SIMPLE 0
2695 #define FF_PROFILE_VC1_MAIN 1
2696 #define FF_PROFILE_VC1_COMPLEX 2
2697 #define FF_PROFILE_VC1_ADVANCED 3
2698
2699 #define FF_PROFILE_MPEG4_SIMPLE 0
2700 #define FF_PROFILE_MPEG4_SIMPLE_SCALABLE 1
2701 #define FF_PROFILE_MPEG4_CORE 2
2702 #define FF_PROFILE_MPEG4_MAIN 3
2703 #define FF_PROFILE_MPEG4_N_BIT 4
2704 #define FF_PROFILE_MPEG4_SCALABLE_TEXTURE 5
2705 #define FF_PROFILE_MPEG4_SIMPLE_FACE_ANIMATION 6
2706 #define FF_PROFILE_MPEG4_BASIC_ANIMATED_TEXTURE 7
2707 #define FF_PROFILE_MPEG4_HYBRID 8
2708 #define FF_PROFILE_MPEG4_ADVANCED_REAL_TIME 9
2709 #define FF_PROFILE_MPEG4_CORE_SCALABLE 10
2710 #define FF_PROFILE_MPEG4_ADVANCED_CODING 11
2711 #define FF_PROFILE_MPEG4_ADVANCED_CORE 12
2712 #define FF_PROFILE_MPEG4_ADVANCED_SCALABLE_TEXTURE 13
2713 #define FF_PROFILE_MPEG4_SIMPLE_STUDIO 14
2714 #define FF_PROFILE_MPEG4_ADVANCED_SIMPLE 15
2715
2716 #define FF_PROFILE_JPEG2000_CSTREAM_RESTRICTION_0 0
2717 #define FF_PROFILE_JPEG2000_CSTREAM_RESTRICTION_1 1
2718 #define FF_PROFILE_JPEG2000_CSTREAM_NO_RESTRICTION 2
2719 #define FF_PROFILE_JPEG2000_DCINEMA_2K 3
2720 #define FF_PROFILE_JPEG2000_DCINEMA_4K 4
2721
2722
2723 #define FF_PROFILE_HEVC_MAIN 1
2724 #define FF_PROFILE_HEVC_MAIN_10 2
2725 #define FF_PROFILE_HEVC_MAIN_STILL_PICTURE 3
2726
2727 /**
2728 * level
2729 * - encoding: Set by user.
2730 * - decoding: Set by libavcodec.
2731 */
2732 int level;
2733 #define FF_LEVEL_UNKNOWN -99
2734
2735 /**
2736 *
2737 * - encoding: unused
2738 * - decoding: Set by user.
2739 */
2740 enum AVDiscard skip_loop_filter;
2741
2742 /**
2743 *
2744 * - encoding: unused
2745 * - decoding: Set by user.
2746 */
2747 enum AVDiscard skip_idct;
2748
2749 /**
2750 *
2751 * - encoding: unused
2752 * - decoding: Set by user.
2753 */
2754 enum AVDiscard skip_frame;
2755
2756 /**
2757 * Header containing style information for text subtitles.
2758 * For SUBTITLE_ASS subtitle type, it should contain the whole ASS
2759 * [Script Info] and [V4+ Styles] section, plus the [Events] line and
2760 * the Format line following. It shouldn't include any Dialogue line.
2761 * - encoding: Set/allocated/freed by user (before avcodec_open2())
2762 * - decoding: Set/allocated/freed by libavcodec (by avcodec_open2())
2763 */
2764 uint8_t *subtitle_header;
2765 int subtitle_header_size;
2766
2767 #if FF_API_ERROR_RATE
2768 /**
2769 * @deprecated use the 'error_rate' private AVOption of the mpegvideo
2770 * encoders
2771 */
2772 attribute_deprecated
2773 int error_rate;
2774 #endif
2775
2776 #if FF_API_CODEC_PKT
2777 /**
2778 * @deprecated this field is not supposed to be accessed from outside lavc
2779 */
2780 attribute_deprecated
2781 AVPacket *pkt;
2782 #endif
2783
2784 /**
2785 * VBV delay coded in the last frame (in periods of a 27 MHz clock).
2786 * Used for compliant TS muxing.
2787 * - encoding: Set by libavcodec.
2788 * - decoding: unused.
2789 */
2790 uint64_t vbv_delay;
2791 } AVCodecContext;
2792
2793 /**
2794 * AVProfile.
2795 */
2796 typedef struct AVProfile {
2797 int profile;
2798 const char *name; ///< short name for the profile
2799 } AVProfile;
2800
2801 typedef struct AVCodecDefault AVCodecDefault;
2802
2803 struct AVSubtitle;
2804
2805 /**
2806 * AVCodec.
2807 */
2808 typedef struct AVCodec {
2809 /**
2810 * Name of the codec implementation.
2811 * The name is globally unique among encoders and among decoders (but an
2812 * encoder and a decoder can share the same name).
2813 * This is the primary way to find a codec from the user perspective.
2814 */
2815 const char *name;
2816 /**
2817 * Descriptive name for the codec, meant to be more human readable than name.
2818 * You should use the NULL_IF_CONFIG_SMALL() macro to define it.
2819 */
2820 const char *long_name;
2821 enum AVMediaType type;
2822 enum AVCodecID id;
2823 /**
2824 * Codec capabilities.
2825 * see CODEC_CAP_*
2826 */
2827 int capabilities;
2828 const AVRational *supported_framerates; ///< array of supported framerates, or NULL if any, array is terminated by {0,0}
2829 const enum AVPixelFormat *pix_fmts; ///< array of supported pixel formats, or NULL if unknown, array is terminated by -1
2830 const int *supported_samplerates; ///< array of supported audio samplerates, or NULL if unknown, array is terminated by 0
2831 const enum AVSampleFormat *sample_fmts; ///< array of supported sample formats, or NULL if unknown, array is terminated by -1
2832 const uint64_t *channel_layouts; ///< array of support channel layouts, or NULL if unknown. array is terminated by 0
2833 #if FF_API_LOWRES
2834 attribute_deprecated uint8_t max_lowres; ///< maximum value for lowres supported by the decoder
2835 #endif
2836 const AVClass *priv_class; ///< AVClass for the private context
2837 const AVProfile *profiles; ///< array of recognized profiles, or NULL if unknown, array is terminated by {FF_PROFILE_UNKNOWN}
2838
2839 /*****************************************************************
2840 * No fields below this line are part of the public API. They
2841 * may not be used outside of libavcodec and can be changed and
2842 * removed at will.
2843 * New public fields should be added right above.
2844 *****************************************************************
2845 */
2846 int priv_data_size;
2847 struct AVCodec *next;
2848 /**
2849 * @name Frame-level threading support functions
2850 * @{
2851 */
2852 /**
2853 * If defined, called on thread contexts when they are created.
2854 * If the codec allocates writable tables in init(), re-allocate them here.
2855 * priv_data will be set to a copy of the original.
2856 */
2857 int (*init_thread_copy)(AVCodecContext *);
2858 /**
2859 * Copy necessary context variables from a previous thread context to the current one.
2860 * If not defined, the next thread will start automatically; otherwise, the codec
2861 * must call ff_thread_finish_setup().
2862 *
2863 * dst and src will (rarely) point to the same context, in which case memcpy should be skipped.
2864 */
2865 int (*update_thread_context)(AVCodecContext *dst, const AVCodecContext *src);
2866 /** @} */
2867
2868 /**
2869 * Private codec-specific defaults.
2870 */
2871 const AVCodecDefault *defaults;
2872
2873 /**
2874 * Initialize codec static data, called from avcodec_register().
2875 */
2876 void (*init_static_data)(struct AVCodec *codec);
2877
2878 int (*init)(AVCodecContext *);
2879 int (*encode_sub)(AVCodecContext *, uint8_t *buf, int buf_size,
2880 const struct AVSubtitle *sub);
2881 /**
2882 * Encode data to an AVPacket.
2883 *
2884 * @param avctx codec context
2885 * @param avpkt output AVPacket (may contain a user-provided buffer)
2886 * @param[in] frame AVFrame containing the raw data to be encoded
2887 * @param[out] got_packet_ptr encoder sets to 0 or 1 to indicate that a
2888 * non-empty packet was returned in avpkt.
2889 * @return 0 on success, negative error code on failure
2890 */
2891 int (*encode2)(AVCodecContext *avctx, AVPacket *avpkt, const AVFrame *frame,
2892 int *got_packet_ptr);
2893 int (*decode)(AVCodecContext *, void *outdata, int *outdata_size, AVPacket *avpkt);
2894 int (*close)(AVCodecContext *);
2895 /**
2896 * Flush buffers.
2897 * Will be called when seeking
2898 */
2899 void (*flush)(AVCodecContext *);
2900 } AVCodec;
2901
2902 /**
2903 * AVHWAccel.
2904 */
2905 typedef struct AVHWAccel {
2906 /**
2907 * Name of the hardware accelerated codec.
2908 * The name is globally unique among encoders and among decoders (but an
2909 * encoder and a decoder can share the same name).
2910 */
2911 const char *name;
2912
2913 /**
2914 * Type of codec implemented by the hardware accelerator.
2915 *
2916 * See AVMEDIA_TYPE_xxx
2917 */
2918 enum AVMediaType type;
2919
2920 /**
2921 * Codec implemented by the hardware accelerator.
2922 *
2923 * See AV_CODEC_ID_xxx
2924 */
2925 enum AVCodecID id;
2926
2927 /**
2928 * Supported pixel format.
2929 *
2930 * Only hardware accelerated formats are supported here.
2931 */
2932 enum AVPixelFormat pix_fmt;
2933
2934 /**
2935 * Hardware accelerated codec capabilities.
2936 * see FF_HWACCEL_CODEC_CAP_*
2937 */
2938 int capabilities;
2939
2940 /*****************************************************************
2941 * No fields below this line are part of the public API. They
2942 * may not be used outside of libavcodec and can be changed and
2943 * removed at will.
2944 * New public fields should be added right above.
2945 *****************************************************************
2946 */
2947 struct AVHWAccel *next;
2948
2949 /**
2950 * Called at the beginning of each frame or field picture.
2951 *
2952 * Meaningful frame information (codec specific) is guaranteed to
2953 * be parsed at this point. This function is mandatory.
2954 *
2955 * Note that buf can be NULL along with buf_size set to 0.
2956 * Otherwise, this means the whole frame is available at this point.
2957 *
2958 * @param avctx the codec context
2959 * @param buf the frame data buffer base
2960 * @param buf_size the size of the frame in bytes
2961 * @return zero if successful, a negative value otherwise
2962 */
2963 int (*start_frame)(AVCodecContext *avctx, const uint8_t *buf, uint32_t buf_size);
2964
2965 /**
2966 * Callback for each slice.
2967 *
2968 * Meaningful slice information (codec specific) is guaranteed to
2969 * be parsed at this point. This function is mandatory.
2970 *
2971 * @param avctx the codec context
2972 * @param buf the slice data buffer base
2973 * @param buf_size the size of the slice in bytes
2974 * @return zero if successful, a negative value otherwise
2975 */
2976 int (*decode_slice)(AVCodecContext *avctx, const uint8_t *buf, uint32_t buf_size);
2977
2978 /**
2979 * Called at the end of each frame or field picture.
2980 *
2981 * The whole picture is parsed at this point and can now be sent
2982 * to the hardware accelerator. This function is mandatory.
2983 *
2984 * @param avctx the codec context
2985 * @return zero if successful, a negative value otherwise
2986 */
2987 int (*end_frame)(AVCodecContext *avctx);
2988
2989 /**
2990 * Size of HW accelerator private data.
2991 *
2992 * Private data is allocated with av_mallocz() before
2993 * AVCodecContext.get_buffer() and deallocated after
2994 * AVCodecContext.release_buffer().
2995 */
2996 int priv_data_size;
2997 } AVHWAccel;
2998
2999 /**
3000 * @defgroup lavc_picture AVPicture
3001 *
3002 * Functions for working with AVPicture
3003 * @{
3004 */
3005
3006 /**
3007 * four components are given, that's all.
3008 * the last component is alpha
3009 */
3010 typedef struct AVPicture {
3011 uint8_t *data[AV_NUM_DATA_POINTERS];
3012 int linesize[AV_NUM_DATA_POINTERS]; ///< number of bytes per line
3013 } AVPicture;
3014
3015 /**
3016 * @}
3017 */
3018
3019 #define AVPALETTE_SIZE 1024
3020 #define AVPALETTE_COUNT 256
3021
3022 enum AVSubtitleType {
3023 SUBTITLE_NONE,
3024
3025 SUBTITLE_BITMAP, ///< A bitmap, pict will be set
3026
3027 /**
3028 * Plain text, the text field must be set by the decoder and is
3029 * authoritative. ass and pict fields may contain approximations.
3030 */
3031 SUBTITLE_TEXT,
3032
3033 /**
3034 * Formatted text, the ass field must be set by the decoder and is
3035 * authoritative. pict and text fields may contain approximations.
3036 */
3037 SUBTITLE_ASS,
3038 };
3039
3040 #define AV_SUBTITLE_FLAG_FORCED 0x00000001
3041
3042 typedef struct AVSubtitleRect {
3043 int x; ///< top left corner of pict, undefined when pict is not set
3044 int y; ///< top left corner of pict, undefined when pict is not set
3045 int w; ///< width of pict, undefined when pict is not set
3046 int h; ///< height of pict, undefined when pict is not set
3047 int nb_colors; ///< number of colors in pict, undefined when pict is not set
3048
3049 /**
3050 * data+linesize for the bitmap of this subtitle.
3051 * can be set for text/ass as well once they where rendered
3052 */
3053 AVPicture pict;
3054 enum AVSubtitleType type;
3055
3056 char *text; ///< 0 terminated plain UTF-8 text
3057
3058 /**
3059 * 0 terminated ASS/SSA compatible event line.
3060 * The pressentation of this is unaffected by the other values in this
3061 * struct.
3062 */
3063 char *ass;
3064 int flags;
3065 } AVSubtitleRect;
3066
3067 typedef struct AVSubtitle {
3068 uint16_t format; /* 0 = graphics */
3069 uint32_t start_display_time; /* relative to packet pts, in ms */
3070 uint32_t end_display_time; /* relative to packet pts, in ms */
3071 unsigned num_rects;
3072 AVSubtitleRect **rects;
3073 int64_t pts; ///< Same as packet pts, in AV_TIME_BASE
3074 } AVSubtitle;
3075
3076 /**
3077 * If c is NULL, returns the first registered codec,
3078 * if c is non-NULL, returns the next registered codec after c,
3079 * or NULL if c is the last one.
3080 */
3081 AVCodec *av_codec_next(const AVCodec *c);
3082
3083 /**
3084 * Return the LIBAVCODEC_VERSION_INT constant.
3085 */
3086 unsigned avcodec_version(void);
3087
3088 /**
3089 * Return the libavcodec build-time configuration.
3090 */
3091 const char *avcodec_configuration(void);
3092
3093 /**
3094 * Return the libavcodec license.
3095 */
3096 const char *avcodec_license(void);
3097
3098 /**
3099 * Register the codec codec and initialize libavcodec.
3100 *
3101 * @warning either this function or avcodec_register_all() must be called
3102 * before any other libavcodec functions.
3103 *
3104 * @see avcodec_register_all()
3105 */
3106 void avcodec_register(AVCodec *codec);
3107
3108 /**
3109 * Register all the codecs, parsers and bitstream filters which were enabled at
3110 * configuration time. If you do not call this function you can select exactly
3111 * which formats you want to support, by using the individual registration
3112 * functions.
3113 *
3114 * @see avcodec_register
3115 * @see av_register_codec_parser
3116 * @see av_register_bitstream_filter
3117 */
3118 void avcodec_register_all(void);
3119
3120 /**
3121 * Allocate an AVCodecContext and set its fields to default values. The
3122 * resulting struct can be deallocated by calling avcodec_close() on it followed
3123 * by av_free().
3124 *
3125 * @param codec if non-NULL, allocate private data and initialize defaults
3126 * for the given codec. It is illegal to then call avcodec_open2()
3127 * with a different codec.
3128 * If NULL, then the codec-specific defaults won't be initialized,
3129 * which may result in suboptimal default settings (this is
3130 * important mainly for encoders, e.g. libx264).
3131 *
3132 * @return An AVCodecContext filled with default values or NULL on failure.
3133 * @see avcodec_get_context_defaults
3134 */
3135 AVCodecContext *avcodec_alloc_context3(const AVCodec *codec);
3136
3137 /**
3138 * Set the fields of the given AVCodecContext to default values corresponding
3139 * to the given codec (defaults may be codec-dependent).
3140 *
3141 * Do not call this function if a non-NULL codec has been passed
3142 * to avcodec_alloc_context3() that allocated this AVCodecContext.
3143 * If codec is non-NULL, it is illegal to call avcodec_open2() with a
3144 * different codec on this AVCodecContext.
3145 */
3146 int avcodec_get_context_defaults3(AVCodecContext *s, const AVCodec *codec);
3147
3148 /**
3149 * Get the AVClass for AVCodecContext. It can be used in combination with
3150 * AV_OPT_SEARCH_FAKE_OBJ for examining options.
3151 *
3152 * @see av_opt_find().
3153 */
3154 const AVClass *avcodec_get_class(void);
3155
3156 /**
3157 * Copy the settings of the source AVCodecContext into the destination
3158 * AVCodecContext. The resulting destination codec context will be
3159 * unopened, i.e. you are required to call avcodec_open2() before you
3160 * can use this AVCodecContext to decode/encode video/audio data.
3161 *
3162 * @param dest target codec context, should be initialized with
3163 * avcodec_alloc_context3(), but otherwise uninitialized
3164 * @param src source codec context
3165 * @return AVERROR() on error (e.g. memory allocation error), 0 on success
3166 */
3167 int avcodec_copy_context(AVCodecContext *dest, const AVCodecContext *src);
3168
3169 #if FF_API_AVFRAME_LAVC
3170 /**
3171 * @deprecated use av_frame_alloc()
3172 */
3173 attribute_deprecated
3174 AVFrame *avcodec_alloc_frame(void);
3175
3176 /**
3177 * Set the fields of the given AVFrame to default values.
3178 *
3179 * @param frame The AVFrame of which the fields should be set to default values.
3180 *
3181 * @deprecated use av_frame_unref()
3182 */
3183 attribute_deprecated
3184 void avcodec_get_frame_defaults(AVFrame *frame);
3185
3186 /**
3187 * Free the frame and any dynamically allocated objects in it,
3188 * e.g. extended_data.
3189 *
3190 * @param frame frame to be freed. The pointer will be set to NULL.
3191 *
3192 * @warning this function does NOT free the data buffers themselves
3193 * (it does not know how, since they might have been allocated with
3194 * a custom get_buffer()).
3195 *
3196 * @deprecated use av_frame_free()
3197 */
3198 attribute_deprecated
3199 void avcodec_free_frame(AVFrame **frame);
3200 #endif
3201
3202 /**
3203 * Initialize the AVCodecContext to use the given AVCodec. Prior to using this
3204 * function the context has to be allocated with avcodec_alloc_context3().
3205 *
3206 * The functions avcodec_find_decoder_by_name(), avcodec_find_encoder_by_name(),
3207 * avcodec_find_decoder() and avcodec_find_encoder() provide an easy way for
3208 * retrieving a codec.
3209 *
3210 * @warning This function is not thread safe!
3211 *
3212 * @code
3213 * avcodec_register_all();
3214 * av_dict_set(&opts, "b", "2.5M", 0);
3215 * codec = avcodec_find_decoder(AV_CODEC_ID_H264);
3216 * if (!codec)
3217 * exit(1);
3218 *
3219 * context = avcodec_alloc_context3(codec);
3220 *
3221 * if (avcodec_open2(context, codec, opts) < 0)
3222 * exit(1);
3223 * @endcode
3224 *
3225 * @param avctx The context to initialize.
3226 * @param codec The codec to open this context for. If a non-NULL codec has been
3227 * previously passed to avcodec_alloc_context3() or
3228 * avcodec_get_context_defaults3() for this context, then this
3229 * parameter MUST be either NULL or equal to the previously passed
3230 * codec.
3231 * @param options A dictionary filled with AVCodecContext and codec-private options.
3232 * On return this object will be filled with options that were not found.
3233 *
3234 * @return zero on success, a negative value on error
3235 * @see avcodec_alloc_context3(), avcodec_find_decoder(), avcodec_find_encoder(),
3236 * av_dict_set(), av_opt_find().
3237 */
3238 int avcodec_open2(AVCodecContext *avctx, const AVCodec *codec, AVDictionary **options);
3239
3240 /**
3241 * Close a given AVCodecContext and free all the data associated with it
3242 * (but not the AVCodecContext itself).
3243 *
3244 * Calling this function on an AVCodecContext that hasn't been opened will free
3245 * the codec-specific data allocated in avcodec_alloc_context3() /
3246 * avcodec_get_context_defaults3() with a non-NULL codec. Subsequent calls will
3247 * do nothing.
3248 */
3249 int avcodec_close(AVCodecContext *avctx);
3250
3251 /**
3252 * Free all allocated data in the given subtitle struct.
3253 *
3254 * @param sub AVSubtitle to free.
3255 */
3256 void avsubtitle_free(AVSubtitle *sub);
3257
3258 /**
3259 * @}
3260 */
3261
3262 /**
3263 * @addtogroup lavc_packet
3264 * @{
3265 */
3266
3267 #if FF_API_DESTRUCT_PACKET
3268 /**
3269 * Default packet destructor.
3270 * @deprecated use the AVBuffer API instead
3271 */
3272 attribute_deprecated
3273 void av_destruct_packet(AVPacket *pkt);
3274 #endif
3275
3276 /**
3277 * Initialize optional fields of a packet with default values.
3278 *
3279 * Note, this does not touch the data and size members, which have to be
3280 * initialized separately.
3281 *
3282 * @param pkt packet
3283 */
3284 void av_init_packet(AVPacket *pkt);
3285
3286 /**
3287 * Allocate the payload of a packet and initialize its fields with
3288 * default values.
3289 *
3290 * @param pkt packet
3291 * @param size wanted payload size
3292 * @return 0 if OK, AVERROR_xxx otherwise
3293 */
3294 int av_new_packet(AVPacket *pkt, int size);
3295
3296 /**
3297 * Reduce packet size, correctly zeroing padding
3298 *
3299 * @param pkt packet
3300 * @param size new size
3301 */
3302 void av_shrink_packet(AVPacket *pkt, int size);
3303
3304 /**
3305 * Increase packet size, correctly zeroing padding
3306 *
3307 * @param pkt packet
3308 * @param grow_by number of bytes by which to increase the size of the packet
3309 */
3310 int av_grow_packet(AVPacket *pkt, int grow_by);
3311
3312 /**
3313 * Initialize a reference-counted packet from av_malloc()ed data.
3314 *
3315 * @param pkt packet to be initialized. This function will set the data, size,
3316 * buf and destruct fields, all others are left untouched.
3317 * @param data Data allocated by av_malloc() to be used as packet data. If this
3318 * function returns successfully, the data is owned by the underlying AVBuffer.
3319 * The caller may not access the data through other means.
3320 * @param size size of data in bytes, without the padding. I.e. the full buffer
3321 * size is assumed to be size + FF_INPUT_BUFFER_PADDING_SIZE.
3322 *
3323 * @return 0 on success, a negative AVERROR on error
3324 */
3325 int av_packet_from_data(AVPacket *pkt, uint8_t *data, int size);
3326
3327 /**
3328 * @warning This is a hack - the packet memory allocation stuff is broken. The
3329 * packet is allocated if it was not really allocated.
3330 */
3331 int av_dup_packet(AVPacket *pkt);
3332
3333 /**
3334 * Free a packet.
3335 *
3336 * @param pkt packet to free
3337 */
3338 void av_free_packet(AVPacket *pkt);
3339
3340 /**
3341 * Allocate new information of a packet.
3342 *
3343 * @param pkt packet
3344 * @param type side information type
3345 * @param size side information size
3346 * @return pointer to fresh allocated data or NULL otherwise
3347 */
3348 uint8_t* av_packet_new_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
3349 int size);
3350
3351 /**
3352 * Shrink the already allocated side data buffer
3353 *
3354 * @param pkt packet
3355 * @param type side information type
3356 * @param size new side information size
3357 * @return 0 on success, < 0 on failure
3358 */
3359 int av_packet_shrink_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
3360 int size);
3361
3362 /**
3363 * Get side information from packet.
3364 *
3365 * @param pkt packet
3366 * @param type desired side information type
3367 * @param size pointer for side information size to store (optional)
3368 * @return pointer to data if present or NULL otherwise
3369 */
3370 uint8_t* av_packet_get_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
3371 int *size);
3372
3373 /**
3374 * Convenience function to free all the side data stored.
3375 * All the other fields stay untouched.
3376 *
3377 * @param pkt packet
3378 */
3379 void av_packet_free_side_data(AVPacket *pkt);
3380
3381 /**
3382 * Setup a new reference to the data described by a given packet
3383 *
3384 * If src is reference-counted, setup dst as a new reference to the
3385 * buffer in src. Otherwise allocate a new buffer in dst and copy the
3386 * data from src into it.
3387 *
3388 * All the other fields are copied from src.
3389 *
3390 * @see av_packet_unref
3391 *
3392 * @param dst Destination packet
3393 * @param src Source packet
3394 *
3395 * @return 0 on success, a negative AVERROR on error.
3396 */
3397 int av_packet_ref(AVPacket *dst, AVPacket *src);
3398
3399 /**
3400 * Wipe the packet.
3401 *
3402 * Unreference the buffer referenced by the packet and reset the
3403 * remaining packet fields to their default values.
3404 *
3405 * @param pkt The packet to be unreferenced.
3406 */
3407 void av_packet_unref(AVPacket *pkt);
3408
3409 /**
3410 * Move every field in src to dst and reset src.
3411 *
3412 * @see av_packet_unref
3413 *
3414 * @param src Source packet, will be reset
3415 * @param dst Destination packet
3416 */
3417 void av_packet_move_ref(AVPacket *dst, AVPacket *src);
3418
3419 /**
3420 * Copy only "properties" fields from src to dst.
3421 *
3422 * Properties for the purpose of this function are all the fields
3423 * beside those related to the packet data (buf, data, size)
3424 *
3425 * @param dst Destination packet
3426 * @param src Source packet
3427 *
3428 * @return 0 on success AVERROR on failure.
3429 *
3430 */
3431 int av_packet_copy_props(AVPacket *dst, const AVPacket *src);
3432
3433 /**
3434 * @}
3435 */
3436
3437 /**
3438 * @addtogroup lavc_decoding
3439 * @{
3440 */
3441
3442 /**
3443 * Find a registered decoder with a matching codec ID.
3444 *
3445 * @param id AVCodecID of the requested decoder
3446 * @return A decoder if one was found, NULL otherwise.
3447 */
3448 AVCodec *avcodec_find_decoder(enum AVCodecID id);
3449
3450 /**
3451 * Find a registered decoder with the specified name.
3452 *
3453 * @param name name of the requested decoder
3454 * @return A decoder if one was found, NULL otherwise.
3455 */
3456 AVCodec *avcodec_find_decoder_by_name(const char *name);
3457
3458 #if FF_API_GET_BUFFER
3459 attribute_deprecated int avcodec_default_get_buffer(AVCodecContext *s, AVFrame *pic);
3460 attribute_deprecated void avcodec_default_release_buffer(AVCodecContext *s, AVFrame *pic);
3461 attribute_deprecated int avcodec_default_reget_buffer(AVCodecContext *s, AVFrame *pic);
3462 #endif
3463
3464 /**
3465 * The default callback for AVCodecContext.get_buffer2(). It is made public so
3466 * it can be called by custom get_buffer2() implementations for decoders without
3467 * CODEC_CAP_DR1 set.
3468 */
3469 int avcodec_default_get_buffer2(AVCodecContext *s, AVFrame *frame, int flags);
3470
3471 #if FF_API_EMU_EDGE
3472 /**
3473 * Return the amount of padding in pixels which the get_buffer callback must
3474 * provide around the edge of the image for codecs which do not have the
3475 * CODEC_FLAG_EMU_EDGE flag.
3476 *
3477 * @return Required padding in pixels.
3478 *
3479 * @deprecated CODEC_FLAG_EMU_EDGE is deprecated, so this function is no longer
3480 * needed
3481 */
3482 attribute_deprecated
3483 unsigned avcodec_get_edge_width(void);
3484 #endif
3485
3486 /**
3487 * Modify width and height values so that they will result in a memory
3488 * buffer that is acceptable for the codec if you do not use any horizontal
3489 * padding.
3490 *
3491 * May only be used if a codec with CODEC_CAP_DR1 has been opened.
3492 */
3493 void avcodec_align_dimensions(AVCodecContext *s, int *width, int *height);
3494
3495 /**
3496 * Modify width and height values so that they will result in a memory
3497 * buffer that is acceptable for the codec if you also ensure that all
3498 * line sizes are a multiple of the respective linesize_align[i].
3499 *
3500 * May only be used if a codec with CODEC_CAP_DR1 has been opened.
3501 */
3502 void avcodec_align_dimensions2(AVCodecContext *s, int *width, int *height,
3503 int linesize_align[AV_NUM_DATA_POINTERS]);
3504
3505 /**
3506 * Decode the audio frame of size avpkt->size from avpkt->data into frame.
3507 *
3508 * Some decoders may support multiple frames in a single AVPacket. Such
3509 * decoders would then just decode the first frame and the return value would be
3510 * less than the packet size. In this case, avcodec_decode_audio4 has to be
3511 * called again with an AVPacket containing the remaining data in order to
3512 * decode the second frame, etc... Even if no frames are returned, the packet
3513 * needs to be fed to the decoder with remaining data until it is completely
3514 * consumed or an error occurs.
3515 *
3516 * Some decoders (those marked with CODEC_CAP_DELAY) have a delay between input
3517 * and output. This means that for some packets they will not immediately
3518 * produce decoded output and need to be flushed at the end of decoding to get
3519 * all the decoded data. Flushing is done by calling this function with packets
3520 * with avpkt->data set to NULL and avpkt->size set to 0 until it stops
3521 * returning samples. It is safe to flush even those decoders that are not
3522 * marked with CODEC_CAP_DELAY, then no samples will be returned.
3523 *
3524 * @warning The input buffer, avpkt->data must be FF_INPUT_BUFFER_PADDING_SIZE
3525 * larger than the actual read bytes because some optimized bitstream
3526 * readers read 32 or 64 bits at once and could read over the end.
3527 *
3528 * @param avctx the codec context
3529 * @param[out] frame The AVFrame in which to store decoded audio samples.
3530 * The decoder will allocate a buffer for the decoded frame by
3531 * calling the AVCodecContext.get_buffer2() callback.
3532 * When AVCodecContext.refcounted_frames is set to 1, the frame is
3533 * reference counted and the returned reference belongs to the
3534 * caller. The caller must release the frame using av_frame_unref()
3535 * when the frame is no longer needed. The caller may safely write
3536 * to the frame if av_frame_is_writable() returns 1.
3537 * When AVCodecContext.refcounted_frames is set to 0, the returned
3538 * reference belongs to the decoder and is valid only until the
3539 * next call to this function or until closing or flushing the
3540 * decoder. The caller may not write to it.
3541 * @param[out] got_frame_ptr Zero if no frame could be decoded, otherwise it is
3542 * non-zero. Note that this field being set to zero
3543 * does not mean that an error has occurred. For
3544 * decoders with CODEC_CAP_DELAY set, no given decode
3545 * call is guaranteed to produce a frame.
3546 * @param[in] avpkt The input AVPacket containing the input buffer.
3547 * At least avpkt->data and avpkt->size should be set. Some
3548 * decoders might also require additional fields to be set.
3549 * @return A negative error code is returned if an error occurred during
3550 * decoding, otherwise the number of bytes consumed from the input
3551 * AVPacket is returned.
3552 */
3553 int avcodec_decode_audio4(AVCodecContext *avctx, AVFrame *frame,
3554 int *got_frame_ptr, AVPacket *avpkt);
3555
3556 /**
3557 * Decode the video frame of size avpkt->size from avpkt->data into picture.
3558 * Some decoders may support multiple frames in a single AVPacket, such
3559 * decoders would then just decode the first frame.
3560 *
3561 * @warning The input buffer must be FF_INPUT_BUFFER_PADDING_SIZE larger than
3562 * the actual read bytes because some optimized bitstream readers read 32 or 64
3563 * bits at once and could read over the end.
3564 *
3565 * @warning The end of the input buffer buf should be set to 0 to ensure that
3566 * no overreading happens for damaged MPEG streams.
3567 *
3568 * @note Codecs which have the CODEC_CAP_DELAY capability set have a delay
3569 * between input and output, these need to be fed with avpkt->data=NULL,
3570 * avpkt->size=0 at the end to return the remaining frames.
3571 *
3572 * @param avctx the codec context
3573 * @param[out] picture The AVFrame in which the decoded video frame will be stored.
3574 * Use av_frame_alloc() to get an AVFrame. The codec will
3575 * allocate memory for the actual bitmap by calling the
3576 * AVCodecContext.get_buffer2() callback.
3577 * When AVCodecContext.refcounted_frames is set to 1, the frame is
3578 * reference counted and the returned reference belongs to the
3579 * caller. The caller must release the frame using av_frame_unref()
3580 * when the frame is no longer needed. The caller may safely write
3581 * to the frame if av_frame_is_writable() returns 1.
3582 * When AVCodecContext.refcounted_frames is set to 0, the returned
3583 * reference belongs to the decoder and is valid only until the
3584 * next call to this function or until closing or flushing the
3585 * decoder. The caller may not write to it.
3586 *
3587 * @param[in] avpkt The input AVpacket containing the input buffer.
3588 * You can create such packet with av_init_packet() and by then setting
3589 * data and size, some decoders might in addition need other fields like
3590 * flags&AV_PKT_FLAG_KEY. All decoders are designed to use the least
3591 * fields possible.
3592 * @param[in,out] got_picture_ptr Zero if no frame could be decompressed, otherwise, it is nonzero.
3593 * @return On error a negative value is returned, otherwise the number of bytes
3594 * used or zero if no frame could be decompressed.
3595 */
3596 int avcodec_decode_video2(AVCodecContext *avctx, AVFrame *picture,
3597 int *got_picture_ptr,
3598 AVPacket *avpkt);
3599
3600 /**
3601 * Decode a subtitle message.
3602 * Return a negative value on error, otherwise return the number of bytes used.
3603 * If no subtitle could be decompressed, got_sub_ptr is zero.
3604 * Otherwise, the subtitle is stored in *sub.
3605 * Note that CODEC_CAP_DR1 is not available for subtitle codecs. This is for
3606 * simplicity, because the performance difference is expect to be negligible
3607 * and reusing a get_buffer written for video codecs would probably perform badly
3608 * due to a potentially very different allocation pattern.
3609 *
3610 * @param avctx the codec context
3611 * @param[out] sub The AVSubtitle in which the decoded subtitle will be stored, must be
3612 freed with avsubtitle_free if *got_sub_ptr is set.
3613 * @param[in,out] got_sub_ptr Zero if no subtitle could be decompressed, otherwise, it is nonzero.
3614 * @param[in] avpkt The input AVPacket containing the input buffer.
3615 */
3616 int avcodec_decode_subtitle2(AVCodecContext *avctx, AVSubtitle *sub,
3617 int *got_sub_ptr,
3618 AVPacket *avpkt);
3619
3620 /**
3621 * @defgroup lavc_parsing Frame parsing
3622 * @{
3623 */
3624
3625 enum AVPictureStructure {
3626 AV_PICTURE_STRUCTURE_UNKNOWN, //< unknown
3627 AV_PICTURE_STRUCTURE_TOP_FIELD, //< coded as top field
3628 AV_PICTURE_STRUCTURE_BOTTOM_FIELD, //< coded as bottom field
3629 AV_PICTURE_STRUCTURE_FRAME, //< coded as frame
3630 };
3631
3632 typedef struct AVCodecParserContext {
3633 void *priv_data;
3634 struct AVCodecParser *parser;
3635 int64_t frame_offset; /* offset of the current frame */
3636 int64_t cur_offset; /* current offset
3637 (incremented by each av_parser_parse()) */
3638 int64_t next_frame_offset; /* offset of the next frame */
3639 /* video info */
3640 int pict_type; /* XXX: Put it back in AVCodecContext. */
3641 /**
3642 * This field is used for proper frame duration computation in lavf.
3643 * It signals, how much longer the frame duration of the current frame
3644 * is compared to normal frame duration.
3645 *
3646 * frame_duration = (1 + repeat_pict) * time_base
3647 *
3648 * It is used by codecs like H.264 to display telecined material.
3649 */
3650 int repeat_pict; /* XXX: Put it back in AVCodecContext. */
3651 int64_t pts; /* pts of the current frame */
3652 int64_t dts; /* dts of the current frame */
3653
3654 /* private data */
3655 int64_t last_pts;
3656 int64_t last_dts;
3657 int fetch_timestamp;
3658
3659 #define AV_PARSER_PTS_NB 4
3660 int cur_frame_start_index;
3661 int64_t cur_frame_offset[AV_PARSER_PTS_NB];
3662 int64_t cur_frame_pts[AV_PARSER_PTS_NB];
3663 int64_t cur_frame_dts[AV_PARSER_PTS_NB];
3664
3665 int flags;
3666 #define PARSER_FLAG_COMPLETE_FRAMES 0x0001
3667 #define PARSER_FLAG_ONCE 0x0002
3668 /// Set if the parser has a valid file offset
3669 #define PARSER_FLAG_FETCHED_OFFSET 0x0004
3670
3671 int64_t offset; ///< byte offset from starting packet start
3672 int64_t cur_frame_end[AV_PARSER_PTS_NB];
3673
3674 /**
3675 * Set by parser to 1 for key frames and 0 for non-key frames.
3676 * It is initialized to -1, so if the parser doesn't set this flag,
3677 * old-style fallback using AV_PICTURE_TYPE_I picture type as key frames
3678 * will be used.
3679 */
3680 int key_frame;
3681
3682 /**
3683 * Time difference in stream time base units from the pts of this
3684 * packet to the point at which the output from the decoder has converged
3685 * independent from the availability of previous frames. That is, the
3686 * frames are virtually identical no matter if decoding started from
3687 * the very first frame or from this keyframe.
3688 * Is AV_NOPTS_VALUE if unknown.
3689 * This field is not the display duration of the current frame.
3690 * This field has no meaning if the packet does not have AV_PKT_FLAG_KEY
3691 * set.
3692 *
3693 * The purpose of this field is to allow seeking in streams that have no
3694 * keyframes in the conventional sense. It corresponds to the
3695 * recovery point SEI in H.264 and match_time_delta in NUT. It is also
3696 * essential for some types of subtitle streams to ensure that all
3697 * subtitles are correctly displayed after seeking.
3698 */
3699 int64_t convergence_duration;
3700
3701 // Timestamp generation support:
3702 /**
3703 * Synchronization point for start of timestamp generation.
3704 *
3705 * Set to >0 for sync point, 0 for no sync point and <0 for undefined
3706 * (default).
3707 *
3708 * For example, this corresponds to presence of H.264 buffering period
3709 * SEI message.
3710 */
3711 int dts_sync_point;
3712
3713 /**
3714 * Offset of the current timestamp against last timestamp sync point in
3715 * units of AVCodecContext.time_base.
3716 *
3717 * Set to INT_MIN when dts_sync_point unused. Otherwise, it must
3718 * contain a valid timestamp offset.
3719 *
3720 * Note that the timestamp of sync point has usually a nonzero
3721 * dts_ref_dts_delta, which refers to the previous sync point. Offset of
3722 * the next frame after timestamp sync point will be usually 1.
3723 *
3724 * For example, this corresponds to H.264 cpb_removal_delay.
3725 */
3726 int dts_ref_dts_delta;
3727
3728 /**
3729 * Presentation delay of current frame in units of AVCodecContext.time_base.
3730 *
3731 * Set to INT_MIN when dts_sync_point unused. Otherwise, it must
3732 * contain valid non-negative timestamp delta (presentation time of a frame
3733 * must not lie in the past).
3734 *
3735 * This delay represents the difference between decoding and presentation
3736 * time of the frame.
3737 *
3738 * For example, this corresponds to H.264 dpb_output_delay.
3739 */
3740 int pts_dts_delta;
3741
3742 /**
3743 * Position of the packet in file.
3744 *
3745 * Analogous to cur_frame_pts/dts
3746 */
3747 int64_t cur_frame_pos[AV_PARSER_PTS_NB];
3748
3749 /**
3750 * Byte position of currently parsed frame in stream.
3751 */
3752 int64_t pos;
3753
3754 /**
3755 * Previous frame byte position.
3756 */
3757 int64_t last_pos;
3758
3759 /**
3760 * Duration of the current frame.
3761 * For audio, this is in units of 1 / AVCodecContext.sample_rate.
3762 * For all other types, this is in units of AVCodecContext.time_base.
3763 */
3764 int duration;
3765
3766 enum AVFieldOrder field_order;
3767
3768 /**
3769 * Indicate whether a picture is coded as a frame, top field or bottom field.
3770 *
3771 * For example, H.264 field_pic_flag equal to 0 corresponds to
3772 * AV_PICTURE_STRUCTURE_FRAME. An H.264 picture with field_pic_flag
3773 * equal to 1 and bottom_field_flag equal to 0 corresponds to
3774 * AV_PICTURE_STRUCTURE_TOP_FIELD.
3775 */
3776 enum AVPictureStructure picture_structure;
3777
3778 /**
3779 * Picture number incremented in presentation or output order.
3780 * This field may be reinitialized at the first picture of a new sequence.
3781 *
3782 * For example, this corresponds to H.264 PicOrderCnt.
3783 */
3784 int output_picture_number;
3785 } AVCodecParserContext;
3786
3787 typedef struct AVCodecParser {
3788 int codec_ids[5]; /* several codec IDs are permitted */
3789 int priv_data_size;
3790 int (*parser_init)(AVCodecParserContext *s);
3791 int (*parser_parse)(AVCodecParserContext *s,
3792 AVCodecContext *avctx,
3793 const uint8_t **poutbuf, int *poutbuf_size,
3794 const uint8_t *buf, int buf_size);
3795 void (*parser_close)(AVCodecParserContext *s);
3796 int (*split)(AVCodecContext *avctx, const uint8_t *buf, int buf_size);
3797 struct AVCodecParser *next;
3798 } AVCodecParser;
3799
3800 AVCodecParser *av_parser_next(AVCodecParser *c);
3801
3802 void av_register_codec_parser(AVCodecParser *parser);
3803 AVCodecParserContext *av_parser_init(int codec_id);
3804
3805 /**
3806 * Parse a packet.
3807 *
3808 * @param s parser context.
3809 * @param avctx codec context.
3810 * @param poutbuf set to pointer to parsed buffer or NULL if not yet finished.
3811 * @param poutbuf_size set to size of parsed buffer or zero if not yet finished.
3812 * @param buf input buffer.
3813 * @param buf_size input length, to signal EOF, this should be 0 (so that the last frame can be output).
3814 * @param pts input presentation timestamp.
3815 * @param dts input decoding timestamp.
3816 * @param pos input byte position in stream.
3817 * @return the number of bytes of the input bitstream used.
3818 *
3819 * Example:
3820 * @code
3821 * while(in_len){
3822 * len = av_parser_parse2(myparser, AVCodecContext, &data, &size,
3823 * in_data, in_len,
3824 * pts, dts, pos);
3825 * in_data += len;
3826 * in_len -= len;
3827 *
3828 * if(size)
3829 * decode_frame(data, size);
3830 * }
3831 * @endcode
3832 */
3833 int av_parser_parse2(AVCodecParserContext *s,
3834 AVCodecContext *avctx,
3835 uint8_t **poutbuf, int *poutbuf_size,
3836 const uint8_t *buf, int buf_size,
3837 int64_t pts, int64_t dts,
3838 int64_t pos);
3839
3840 /**
3841 * @return 0 if the output buffer is a subset of the input, 1 if it is allocated and must be freed
3842 * @deprecated use AVBitstreamFilter
3843 */
3844 int av_parser_change(AVCodecParserContext *s,
3845 AVCodecContext *avctx,
3846 uint8_t **poutbuf, int *poutbuf_size,
3847 const uint8_t *buf, int buf_size, int keyframe);
3848 void av_parser_close(AVCodecParserContext *s);
3849
3850 /**
3851 * @}
3852 * @}
3853 */
3854
3855 /**
3856 * @addtogroup lavc_encoding
3857 * @{
3858 */
3859
3860 /**
3861 * Find a registered encoder with a matching codec ID.
3862 *
3863 * @param id AVCodecID of the requested encoder
3864 * @return An encoder if one was found, NULL otherwise.
3865 */
3866 AVCodec *avcodec_find_encoder(enum AVCodecID id);
3867
3868 /**
3869 * Find a registered encoder with the specified name.
3870 *
3871 * @param name name of the requested encoder
3872 * @return An encoder if one was found, NULL otherwise.
3873 */
3874 AVCodec *avcodec_find_encoder_by_name(const char *name);
3875
3876 /**
3877 * Encode a frame of audio.
3878 *
3879 * Takes input samples from frame and writes the next output packet, if
3880 * available, to avpkt. The output packet does not necessarily contain data for
3881 * the most recent frame, as encoders can delay, split, and combine input frames
3882 * internally as needed.
3883 *
3884 * @param avctx codec context
3885 * @param avpkt output AVPacket.
3886 * The user can supply an output buffer by setting
3887 * avpkt->data and avpkt->size prior to calling the
3888 * function, but if the size of the user-provided data is not
3889 * large enough, encoding will fail. All other AVPacket fields
3890 * will be reset by the encoder using av_init_packet(). If
3891 * avpkt->data is NULL, the encoder will allocate it.
3892 * The encoder will set avpkt->size to the size of the
3893 * output packet.
3894 *
3895 * If this function fails or produces no output, avpkt will be
3896 * freed using av_free_packet() (i.e. avpkt->destruct will be
3897 * called to free the user supplied buffer).
3898 * @param[in] frame AVFrame containing the raw audio data to be encoded.
3899 * May be NULL when flushing an encoder that has the
3900 * CODEC_CAP_DELAY capability set.
3901 * If CODEC_CAP_VARIABLE_FRAME_SIZE is set, then each frame
3902 * can have any number of samples.
3903 * If it is not set, frame->nb_samples must be equal to
3904 * avctx->frame_size for all frames except the last.
3905 * The final frame may be smaller than avctx->frame_size.
3906 * @param[out] got_packet_ptr This field is set to 1 by libavcodec if the
3907 * output packet is non-empty, and to 0 if it is
3908 * empty. If the function returns an error, the
3909 * packet can be assumed to be invalid, and the
3910 * value of got_packet_ptr is undefined and should
3911 * not be used.
3912 * @return 0 on success, negative error code on failure
3913 */
3914 int avcodec_encode_audio2(AVCodecContext *avctx, AVPacket *avpkt,
3915 const AVFrame *frame, int *got_packet_ptr);
3916
3917 /**
3918 * Encode a frame of video.
3919 *
3920 * Takes input raw video data from frame and writes the next output packet, if
3921 * available, to avpkt. The output packet does not necessarily contain data for
3922 * the most recent frame, as encoders can delay and reorder input frames
3923 * internally as needed.
3924 *
3925 * @param avctx codec context
3926 * @param avpkt output AVPacket.
3927 * The user can supply an output buffer by setting
3928 * avpkt->data and avpkt->size prior to calling the
3929 * function, but if the size of the user-provided data is not
3930 * large enough, encoding will fail. All other AVPacket fields
3931 * will be reset by the encoder using av_init_packet(). If
3932 * avpkt->data is NULL, the encoder will allocate it.
3933 * The encoder will set avpkt->size to the size of the
3934 * output packet. The returned data (if any) belongs to the
3935 * caller, he is responsible for freeing it.
3936 *
3937 * If this function fails or produces no output, avpkt will be
3938 * freed using av_free_packet() (i.e. avpkt->destruct will be
3939 * called to free the user supplied buffer).
3940 * @param[in] frame AVFrame containing the raw video data to be encoded.
3941 * May be NULL when flushing an encoder that has the
3942 * CODEC_CAP_DELAY capability set.
3943 * @param[out] got_packet_ptr This field is set to 1 by libavcodec if the
3944 * output packet is non-empty, and to 0 if it is
3945 * empty. If the function returns an error, the
3946 * packet can be assumed to be invalid, and the
3947 * value of got_packet_ptr is undefined and should
3948 * not be used.
3949 * @return 0 on success, negative error code on failure
3950 */
3951 int avcodec_encode_video2(AVCodecContext *avctx, AVPacket *avpkt,
3952 const AVFrame *frame, int *got_packet_ptr);
3953
3954 int avcodec_encode_subtitle(AVCodecContext *avctx, uint8_t *buf, int buf_size,
3955 const AVSubtitle *sub);
3956
3957
3958 /**
3959 * @}
3960 */
3961
3962 /**
3963 * @addtogroup lavc_picture
3964 * @{
3965 */
3966
3967 /**
3968 * Allocate memory for a picture. Call avpicture_free() to free it.
3969 *
3970 * @see avpicture_fill()
3971 *
3972 * @param picture the picture to be filled in
3973 * @param pix_fmt the format of the picture
3974 * @param width the width of the picture
3975 * @param height the height of the picture
3976 * @return zero if successful, a negative value if not
3977 */
3978 int avpicture_alloc(AVPicture *picture, enum AVPixelFormat pix_fmt, int width, int height);
3979
3980 /**
3981 * Free a picture previously allocated by avpicture_alloc().
3982 * The data buffer used by the AVPicture is freed, but the AVPicture structure
3983 * itself is not.
3984 *
3985 * @param picture the AVPicture to be freed
3986 */
3987 void avpicture_free(AVPicture *picture);
3988
3989 /**
3990 * Fill in the AVPicture fields.
3991 * The fields of the given AVPicture are filled in by using the 'ptr' address
3992 * which points to the image data buffer. Depending on the specified picture
3993 * format, one or multiple image data pointers and line sizes will be set.
3994 * If a planar format is specified, several pointers will be set pointing to
3995 * the different picture planes and the line sizes of the different planes
3996 * will be stored in the lines_sizes array.
3997 * Call with ptr == NULL to get the required size for the ptr buffer.
3998 *
3999 * To allocate the buffer and fill in the AVPicture fields in one call,
4000 * use avpicture_alloc().
4001 *
4002 * @param picture AVPicture whose fields are to be filled in
4003 * @param ptr Buffer which will contain or contains the actual image data
4004 * @param pix_fmt The format in which the picture data is stored.
4005 * @param width the width of the image in pixels
4006 * @param height the height of the image in pixels
4007 * @return size of the image data in bytes
4008 */
4009 int avpicture_fill(AVPicture *picture, uint8_t *ptr,
4010 enum AVPixelFormat pix_fmt, int width, int height);
4011
4012 /**
4013 * Copy pixel data from an AVPicture into a buffer.
4014 * The data is stored compactly, without any gaps for alignment or padding
4015 * which may be applied by avpicture_fill().
4016 *
4017 * @see avpicture_get_size()
4018 *
4019 * @param[in] src AVPicture containing image data
4020 * @param[in] pix_fmt The format in which the picture data is stored.
4021 * @param[in] width the width of the image in pixels.
4022 * @param[in] height the height of the image in pixels.
4023 * @param[out] dest A buffer into which picture data will be copied.
4024 * @param[in] dest_size The size of 'dest'.
4025 * @return The number of bytes written to dest, or a negative value (error code) on error.
4026 */
4027 int avpicture_layout(const AVPicture* src, enum AVPixelFormat pix_fmt,
4028 int width, int height,
4029 unsigned char *dest, int dest_size);
4030
4031 /**
4032 * Calculate the size in bytes that a picture of the given width and height
4033 * would occupy if stored in the given picture format.
4034 * Note that this returns the size of a compact representation as generated
4035 * by avpicture_layout(), which can be smaller than the size required for e.g.
4036 * avpicture_fill().
4037 *
4038 * @param pix_fmt the given picture format
4039 * @param width the width of the image
4040 * @param height the height of the image
4041 * @return Image data size in bytes or -1 on error (e.g. too large dimensions).
4042 */
4043 int avpicture_get_size(enum AVPixelFormat pix_fmt, int width, int height);
4044
4045 #if FF_API_DEINTERLACE
4046 /**
4047 * deinterlace - if not supported return -1
4048 *
4049 * @deprecated - use yadif (in libavfilter) instead
4050 */
4051 attribute_deprecated
4052 int avpicture_deinterlace(AVPicture *dst, const AVPicture *src,
4053 enum AVPixelFormat pix_fmt, int width, int height);
4054 #endif
4055 /**
4056 * Copy image src to dst. Wraps av_picture_data_copy() above.
4057 */
4058 void av_picture_copy(AVPicture *dst, const AVPicture *src,
4059 enum AVPixelFormat pix_fmt, int width, int height);
4060
4061 /**
4062 * Crop image top and left side.
4063 */
4064 int av_picture_crop(AVPicture *dst, const AVPicture *src,
4065 enum AVPixelFormat pix_fmt, int top_band, int left_band);
4066
4067 /**
4068 * Pad image.
4069 */
4070 int av_picture_pad(AVPicture *dst, const AVPicture *src, int height, int width, enum AVPixelFormat pix_fmt,
4071 int padtop, int padbottom, int padleft, int padright, int *color);
4072
4073 /**
4074 * @}
4075 */
4076
4077 /**
4078 * @defgroup lavc_misc Utility functions
4079 * @ingroup libavc
4080 *
4081 * Miscellaneous utility functions related to both encoding and decoding
4082 * (or neither).
4083 * @{
4084 */
4085
4086 /**
4087 * @defgroup lavc_misc_pixfmt Pixel formats
4088 *
4089 * Functions for working with pixel formats.
4090 * @{
4091 */
4092
4093 /**
4094 * @deprecated Use av_pix_fmt_get_chroma_sub_sample
4095 */
4096
4097 void attribute_deprecated avcodec_get_chroma_sub_sample(enum AVPixelFormat pix_fmt, int *h_shift, int *v_shift);
4098
4099 /**
4100 * Return a value representing the fourCC code associated to the
4101 * pixel format pix_fmt, or 0 if no associated fourCC code can be
4102 * found.
4103 */
4104 unsigned int avcodec_pix_fmt_to_codec_tag(enum AVPixelFormat pix_fmt);
4105
4106 #define FF_LOSS_RESOLUTION 0x0001 /**< loss due to resolution change */
4107 #define FF_LOSS_DEPTH 0x0002 /**< loss due to color depth change */
4108 #define FF_LOSS_COLORSPACE 0x0004 /**< loss due to color space conversion */
4109 #define FF_LOSS_ALPHA 0x0008 /**< loss of alpha bits */
4110 #define FF_LOSS_COLORQUANT 0x0010 /**< loss due to color quantization */
4111 #define FF_LOSS_CHROMA 0x0020 /**< loss of chroma (e.g. RGB to gray conversion) */
4112
4113 /**
4114 * Compute what kind of losses will occur when converting from one specific
4115 * pixel format to another.
4116 * When converting from one pixel format to another, information loss may occur.
4117 * For example, when converting from RGB24 to GRAY, the color information will
4118 * be lost. Similarly, other losses occur when converting from some formats to
4119 * other formats. These losses can involve loss of chroma, but also loss of
4120 * resolution, loss of color depth, loss due to the color space conversion, loss
4121 * of the alpha bits or loss due to color quantization.
4122 * avcodec_get_fix_fmt_loss() informs you about the various types of losses
4123 * which will occur when converting from one pixel format to another.
4124 *
4125 * @param[in] dst_pix_fmt destination pixel format
4126 * @param[in] src_pix_fmt source pixel format
4127 * @param[in] has_alpha Whether the source pixel format alpha channel is used.
4128 * @return Combination of flags informing you what kind of losses will occur.
4129 */
4130 int avcodec_get_pix_fmt_loss(enum AVPixelFormat dst_pix_fmt, enum AVPixelFormat src_pix_fmt,
4131 int has_alpha);
4132
4133 /**
4134 * Find the best pixel format to convert to given a certain source pixel
4135 * format. When converting from one pixel format to another, information loss
4136 * may occur. For example, when converting from RGB24 to GRAY, the color
4137 * information will be lost. Similarly, other losses occur when converting from
4138 * some formats to other formats. avcodec_find_best_pix_fmt2() searches which of
4139 * the given pixel formats should be used to suffer the least amount of loss.
4140 * The pixel formats from which it chooses one, are determined by the
4141 * pix_fmt_list parameter.
4142 *
4143 *
4144 * @param[in] pix_fmt_list AV_PIX_FMT_NONE terminated array of pixel formats to choose from
4145 * @param[in] src_pix_fmt source pixel format
4146 * @param[in] has_alpha Whether the source pixel format alpha channel is used.
4147 * @param[out] loss_ptr Combination of flags informing you what kind of losses will occur.
4148 * @return The best pixel format to convert to or -1 if none was found.
4149 */
4150 enum AVPixelFormat avcodec_find_best_pix_fmt2(enum AVPixelFormat *pix_fmt_list,
4151 enum AVPixelFormat src_pix_fmt,
4152 int has_alpha, int *loss_ptr);
4153
4154 enum AVPixelFormat avcodec_default_get_format(struct AVCodecContext *s, const enum AVPixelFormat * fmt);
4155
4156 /**
4157 * @}
4158 */
4159
4160 #if FF_API_SET_DIMENSIONS
4161 /**
4162 * @deprecated this function is not supposed to be used from outside of lavc
4163 */
4164 attribute_deprecated
4165 void avcodec_set_dimensions(AVCodecContext *s, int width, int height);
4166 #endif
4167
4168 /**
4169 * Put a string representing the codec tag codec_tag in buf.
4170 *
4171 * @param buf buffer to place codec tag in
4172 * @param buf_size size in bytes of buf
4173 * @param codec_tag codec tag to assign
4174 * @return the length of the string that would have been generated if
4175 * enough space had been available, excluding the trailing null
4176 */
4177 size_t av_get_codec_tag_string(char *buf, size_t buf_size, unsigned int codec_tag);
4178
4179 void avcodec_string(char *buf, int buf_size, AVCodecContext *enc, int encode);
4180
4181 /**
4182 * Return a name for the specified profile, if available.
4183 *
4184 * @param codec the codec that is searched for the given profile
4185 * @param profile the profile value for which a name is requested
4186 * @return A name for the profile if found, NULL otherwise.
4187 */
4188 const char *av_get_profile_name(const AVCodec *codec, int profile);
4189
4190 int avcodec_default_execute(AVCodecContext *c, int (*func)(AVCodecContext *c2, void *arg2),void *arg, int *ret, int count, int size);
4191 int avcodec_default_execute2(AVCodecContext *c, int (*func)(AVCodecContext *c2, void *arg2, int, int),void *arg, int *ret, int count);
4192 //FIXME func typedef
4193
4194 /**
4195 * Fill audio frame data and linesize.
4196 * AVFrame extended_data channel pointers are allocated if necessary for
4197 * planar audio.
4198 *
4199 * @param frame the AVFrame
4200 * frame->nb_samples must be set prior to calling the
4201 * function. This function fills in frame->data,
4202 * frame->extended_data, frame->linesize[0].
4203 * @param nb_channels channel count
4204 * @param sample_fmt sample format
4205 * @param buf buffer to use for frame data
4206 * @param buf_size size of buffer
4207 * @param align plane size sample alignment (0 = default)
4208 * @return 0 on success, negative error code on failure
4209 */
4210 int avcodec_fill_audio_frame(AVFrame *frame, int nb_channels,
4211 enum AVSampleFormat sample_fmt, const uint8_t *buf,
4212 int buf_size, int align);
4213
4214 /**
4215 * Reset the internal decoder state / flush internal buffers. Should be called
4216 * e.g. when seeking or when switching to a different stream.
4217 *
4218 * @note when refcounted frames are not used (i.e. avctx->refcounted_frames is 0),
4219 * this invalidates the frames previously returned from the decoder. When
4220 * refcounted frames are used, the decoder just releases any references it might
4221 * keep internally, but the caller's reference remains valid.
4222 */
4223 void avcodec_flush_buffers(AVCodecContext *avctx);
4224
4225 /**
4226 * Return codec bits per sample.
4227 *
4228 * @param[in] codec_id the codec
4229 * @return Number of bits per sample or zero if unknown for the given codec.
4230 */
4231 int av_get_bits_per_sample(enum AVCodecID codec_id);
4232
4233 /**
4234 * Return codec bits per sample.
4235 * Only return non-zero if the bits per sample is exactly correct, not an
4236 * approximation.
4237 *
4238 * @param[in] codec_id the codec
4239 * @return Number of bits per sample or zero if unknown for the given codec.
4240 */
4241 int av_get_exact_bits_per_sample(enum AVCodecID codec_id);
4242
4243 /**
4244 * Return audio frame duration.
4245 *
4246 * @param avctx codec context
4247 * @param frame_bytes size of the frame, or 0 if unknown
4248 * @return frame duration, in samples, if known. 0 if not able to
4249 * determine.
4250 */
4251 int av_get_audio_frame_duration(AVCodecContext *avctx, int frame_bytes);
4252
4253
4254 typedef struct AVBitStreamFilterContext {
4255 void *priv_data;
4256 struct AVBitStreamFilter *filter;
4257 AVCodecParserContext *parser;
4258 struct AVBitStreamFilterContext *next;
4259 } AVBitStreamFilterContext;
4260
4261
4262 typedef struct AVBitStreamFilter {
4263 const char *name;
4264 int priv_data_size;
4265 int (*filter)(AVBitStreamFilterContext *bsfc,
4266 AVCodecContext *avctx, const char *args,
4267 uint8_t **poutbuf, int *poutbuf_size,
4268 const uint8_t *buf, int buf_size, int keyframe);
4269 void (*close)(AVBitStreamFilterContext *bsfc);
4270 struct AVBitStreamFilter *next;
4271 } AVBitStreamFilter;
4272
4273 void av_register_bitstream_filter(AVBitStreamFilter *bsf);
4274 AVBitStreamFilterContext *av_bitstream_filter_init(const char *name);
4275 int av_bitstream_filter_filter(AVBitStreamFilterContext *bsfc,
4276 AVCodecContext *avctx, const char *args,
4277 uint8_t **poutbuf, int *poutbuf_size,
4278 const uint8_t *buf, int buf_size, int keyframe);
4279 void av_bitstream_filter_close(AVBitStreamFilterContext *bsf);
4280
4281 AVBitStreamFilter *av_bitstream_filter_next(AVBitStreamFilter *f);
4282
4283 /* memory */
4284
4285 /**
4286 * Allocate a buffer with padding, reusing the given one if large enough.
4287 *
4288 * Same behaviour av_fast_malloc but the buffer has additional
4289 * FF_INPUT_PADDING_SIZE at the end which will always memset to 0.
4290 *
4291 */
4292 void av_fast_padded_malloc(void *ptr, unsigned int *size, size_t min_size);
4293
4294 /**
4295 * Encode extradata length to a buffer. Used by xiph codecs.
4296 *
4297 * @param s buffer to write to; must be at least (v/255+1) bytes long
4298 * @param v size of extradata in bytes
4299 * @return number of bytes written to the buffer.
4300 */
4301 unsigned int av_xiphlacing(unsigned char *s, unsigned int v);
4302
4303 #if FF_API_MISSING_SAMPLE
4304 /**
4305 * Log a generic warning message about a missing feature. This function is
4306 * intended to be used internally by Libav (libavcodec, libavformat, etc.)
4307 * only, and would normally not be used by applications.
4308 * @param[in] avc a pointer to an arbitrary struct of which the first field is
4309 * a pointer to an AVClass struct
4310 * @param[in] feature string containing the name of the missing feature
4311 * @param[in] want_sample indicates if samples are wanted which exhibit this feature.
4312 * If want_sample is non-zero, additional verbage will be added to the log
4313 * message which tells the user how to report samples to the development
4314 * mailing list.
4315 * @deprecated Use avpriv_report_missing_feature() instead.
4316 */
4317 attribute_deprecated
4318 void av_log_missing_feature(void *avc, const char *feature, int want_sample);
4319
4320 /**
4321 * Log a generic warning message asking for a sample. This function is
4322 * intended to be used internally by Libav (libavcodec, libavformat, etc.)
4323 * only, and would normally not be used by applications.
4324 * @param[in] avc a pointer to an arbitrary struct of which the first field is
4325 * a pointer to an AVClass struct
4326 * @param[in] msg string containing an optional message, or NULL if no message
4327 * @deprecated Use avpriv_request_sample() instead.
4328 */
4329 attribute_deprecated
4330 void av_log_ask_for_sample(void *avc, const char *msg, ...) av_printf_format(2, 3);
4331 #endif /* FF_API_MISSING_SAMPLE */
4332
4333 /**
4334 * Register the hardware accelerator hwaccel.
4335 */
4336 void av_register_hwaccel(AVHWAccel *hwaccel);
4337
4338 /**
4339 * If hwaccel is NULL, returns the first registered hardware accelerator,
4340 * if hwaccel is non-NULL, returns the next registered hardware accelerator
4341 * after hwaccel, or NULL if hwaccel is the last one.
4342 */
4343 AVHWAccel *av_hwaccel_next(AVHWAccel *hwaccel);
4344
4345
4346 /**
4347 * Lock operation used by lockmgr
4348 */
4349 enum AVLockOp {
4350 AV_LOCK_CREATE, ///< Create a mutex
4351 AV_LOCK_OBTAIN, ///< Lock the mutex
4352 AV_LOCK_RELEASE, ///< Unlock the mutex
4353 AV_LOCK_DESTROY, ///< Free mutex resources
4354 };
4355
4356 /**
4357 * Register a user provided lock manager supporting the operations
4358 * specified by AVLockOp. mutex points to a (void *) where the
4359 * lockmgr should store/get a pointer to a user allocated mutex. It's
4360 * NULL upon AV_LOCK_CREATE and != NULL for all other ops.
4361 *
4362 * @param cb User defined callback. Note: Libav may invoke calls to this
4363 * callback during the call to av_lockmgr_register().
4364 * Thus, the application must be prepared to handle that.
4365 * If cb is set to NULL the lockmgr will be unregistered.
4366 * Also note that during unregistration the previously registered
4367 * lockmgr callback may also be invoked.
4368 */
4369 int av_lockmgr_register(int (*cb)(void **mutex, enum AVLockOp op));
4370
4371 /**
4372 * Get the type of the given codec.
4373 */
4374 enum AVMediaType avcodec_get_type(enum AVCodecID codec_id);
4375
4376 /**
4377 * @return a positive value if s is open (i.e. avcodec_open2() was called on it
4378 * with no corresponding avcodec_close()), 0 otherwise.
4379 */
4380 int avcodec_is_open(AVCodecContext *s);
4381
4382 /**
4383 * @return a non-zero number if codec is an encoder, zero otherwise
4384 */
4385 int av_codec_is_encoder(const AVCodec *codec);
4386
4387 /**
4388 * @return a non-zero number if codec is a decoder, zero otherwise
4389 */
4390 int av_codec_is_decoder(const AVCodec *codec);
4391
4392 /**
4393 * @return descriptor for given codec ID or NULL if no descriptor exists.
4394 */
4395 const AVCodecDescriptor *avcodec_descriptor_get(enum AVCodecID id);
4396
4397 /**
4398 * Iterate over all codec descriptors known to libavcodec.
4399 *
4400 * @param prev previous descriptor. NULL to get the first descriptor.
4401 *
4402 * @return next descriptor or NULL after the last descriptor
4403 */
4404 const AVCodecDescriptor *avcodec_descriptor_next(const AVCodecDescriptor *prev);
4405
4406 /**
4407 * @return codec descriptor with the given name or NULL if no such descriptor
4408 * exists.
4409 */
4410 const AVCodecDescriptor *avcodec_descriptor_get_by_name(const char *name);
4411
4412 /**
4413 * @}
4414 */
4415
4416 #endif /* AVCODEC_AVCODEC_H */