avcodec: add a public function, avcodec_fill_audio_frame().
[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 * external API header
27 */
28
29 #include <errno.h>
30 #include "libavutil/samplefmt.h"
31 #include "libavutil/avutil.h"
32 #include "libavutil/cpu.h"
33 #include "libavutil/dict.h"
34 #include "libavutil/log.h"
35 #include "libavutil/pixfmt.h"
36 #include "libavutil/rational.h"
37
38 #include "libavcodec/version.h"
39 /**
40 * @defgroup libavc Encoding/Decoding Library
41 * @{
42 *
43 * @defgroup lavc_decoding Decoding
44 * @{
45 * @}
46 *
47 * @defgroup lavc_encoding Encoding
48 * @{
49 * @}
50 *
51 * @defgroup lavc_codec Codecs
52 * @{
53 * @defgroup lavc_codec_native Native Codecs
54 * @{
55 * @}
56 * @defgroup lavc_codec_wrappers External library wrappers
57 * @{
58 * @}
59 * @defgroup lavc_codec_hwaccel Hardware Accelerators bridge
60 * @{
61 * @}
62 * @}
63 * @defgroup lavc_internal Internal
64 * @{
65 * @}
66 * @}
67 *
68 */
69
70
71 /**
72 * Identify the syntax and semantics of the bitstream.
73 * The principle is roughly:
74 * Two decoders with the same ID can decode the same streams.
75 * Two encoders with the same ID can encode compatible streams.
76 * There may be slight deviations from the principle due to implementation
77 * details.
78 *
79 * If you add a codec ID to this list, add it so that
80 * 1. no value of a existing codec ID changes (that would break ABI),
81 * 2. it is as close as possible to similar codecs.
82 */
83 enum CodecID {
84 CODEC_ID_NONE,
85
86 /* video codecs */
87 CODEC_ID_MPEG1VIDEO,
88 CODEC_ID_MPEG2VIDEO, ///< preferred ID for MPEG-1/2 video decoding
89 CODEC_ID_MPEG2VIDEO_XVMC,
90 CODEC_ID_H261,
91 CODEC_ID_H263,
92 CODEC_ID_RV10,
93 CODEC_ID_RV20,
94 CODEC_ID_MJPEG,
95 CODEC_ID_MJPEGB,
96 CODEC_ID_LJPEG,
97 CODEC_ID_SP5X,
98 CODEC_ID_JPEGLS,
99 CODEC_ID_MPEG4,
100 CODEC_ID_RAWVIDEO,
101 CODEC_ID_MSMPEG4V1,
102 CODEC_ID_MSMPEG4V2,
103 CODEC_ID_MSMPEG4V3,
104 CODEC_ID_WMV1,
105 CODEC_ID_WMV2,
106 CODEC_ID_H263P,
107 CODEC_ID_H263I,
108 CODEC_ID_FLV1,
109 CODEC_ID_SVQ1,
110 CODEC_ID_SVQ3,
111 CODEC_ID_DVVIDEO,
112 CODEC_ID_HUFFYUV,
113 CODEC_ID_CYUV,
114 CODEC_ID_H264,
115 CODEC_ID_INDEO3,
116 CODEC_ID_VP3,
117 CODEC_ID_THEORA,
118 CODEC_ID_ASV1,
119 CODEC_ID_ASV2,
120 CODEC_ID_FFV1,
121 CODEC_ID_4XM,
122 CODEC_ID_VCR1,
123 CODEC_ID_CLJR,
124 CODEC_ID_MDEC,
125 CODEC_ID_ROQ,
126 CODEC_ID_INTERPLAY_VIDEO,
127 CODEC_ID_XAN_WC3,
128 CODEC_ID_XAN_WC4,
129 CODEC_ID_RPZA,
130 CODEC_ID_CINEPAK,
131 CODEC_ID_WS_VQA,
132 CODEC_ID_MSRLE,
133 CODEC_ID_MSVIDEO1,
134 CODEC_ID_IDCIN,
135 CODEC_ID_8BPS,
136 CODEC_ID_SMC,
137 CODEC_ID_FLIC,
138 CODEC_ID_TRUEMOTION1,
139 CODEC_ID_VMDVIDEO,
140 CODEC_ID_MSZH,
141 CODEC_ID_ZLIB,
142 CODEC_ID_QTRLE,
143 CODEC_ID_SNOW,
144 CODEC_ID_TSCC,
145 CODEC_ID_ULTI,
146 CODEC_ID_QDRAW,
147 CODEC_ID_VIXL,
148 CODEC_ID_QPEG,
149 CODEC_ID_PNG,
150 CODEC_ID_PPM,
151 CODEC_ID_PBM,
152 CODEC_ID_PGM,
153 CODEC_ID_PGMYUV,
154 CODEC_ID_PAM,
155 CODEC_ID_FFVHUFF,
156 CODEC_ID_RV30,
157 CODEC_ID_RV40,
158 CODEC_ID_VC1,
159 CODEC_ID_WMV3,
160 CODEC_ID_LOCO,
161 CODEC_ID_WNV1,
162 CODEC_ID_AASC,
163 CODEC_ID_INDEO2,
164 CODEC_ID_FRAPS,
165 CODEC_ID_TRUEMOTION2,
166 CODEC_ID_BMP,
167 CODEC_ID_CSCD,
168 CODEC_ID_MMVIDEO,
169 CODEC_ID_ZMBV,
170 CODEC_ID_AVS,
171 CODEC_ID_SMACKVIDEO,
172 CODEC_ID_NUV,
173 CODEC_ID_KMVC,
174 CODEC_ID_FLASHSV,
175 CODEC_ID_CAVS,
176 CODEC_ID_JPEG2000,
177 CODEC_ID_VMNC,
178 CODEC_ID_VP5,
179 CODEC_ID_VP6,
180 CODEC_ID_VP6F,
181 CODEC_ID_TARGA,
182 CODEC_ID_DSICINVIDEO,
183 CODEC_ID_TIERTEXSEQVIDEO,
184 CODEC_ID_TIFF,
185 CODEC_ID_GIF,
186 #if LIBAVCODEC_VERSION_MAJOR == 53
187 CODEC_ID_FFH264,
188 #endif
189 CODEC_ID_DXA,
190 CODEC_ID_DNXHD,
191 CODEC_ID_THP,
192 CODEC_ID_SGI,
193 CODEC_ID_C93,
194 CODEC_ID_BETHSOFTVID,
195 CODEC_ID_PTX,
196 CODEC_ID_TXD,
197 CODEC_ID_VP6A,
198 CODEC_ID_AMV,
199 CODEC_ID_VB,
200 CODEC_ID_PCX,
201 CODEC_ID_SUNRAST,
202 CODEC_ID_INDEO4,
203 CODEC_ID_INDEO5,
204 CODEC_ID_MIMIC,
205 CODEC_ID_RL2,
206 #if LIBAVCODEC_VERSION_MAJOR == 53
207 CODEC_ID_8SVX_EXP,
208 CODEC_ID_8SVX_FIB,
209 #endif
210 CODEC_ID_ESCAPE124,
211 CODEC_ID_DIRAC,
212 CODEC_ID_BFI,
213 CODEC_ID_CMV,
214 CODEC_ID_MOTIONPIXELS,
215 CODEC_ID_TGV,
216 CODEC_ID_TGQ,
217 CODEC_ID_TQI,
218 CODEC_ID_AURA,
219 CODEC_ID_AURA2,
220 CODEC_ID_V210X,
221 CODEC_ID_TMV,
222 CODEC_ID_V210,
223 CODEC_ID_DPX,
224 CODEC_ID_MAD,
225 CODEC_ID_FRWU,
226 CODEC_ID_FLASHSV2,
227 CODEC_ID_CDGRAPHICS,
228 CODEC_ID_R210,
229 CODEC_ID_ANM,
230 CODEC_ID_BINKVIDEO,
231 CODEC_ID_IFF_ILBM,
232 CODEC_ID_IFF_BYTERUN1,
233 CODEC_ID_KGV1,
234 CODEC_ID_YOP,
235 CODEC_ID_VP8,
236 CODEC_ID_PICTOR,
237 CODEC_ID_ANSI,
238 CODEC_ID_A64_MULTI,
239 CODEC_ID_A64_MULTI5,
240 CODEC_ID_R10K,
241 CODEC_ID_MXPEG,
242 CODEC_ID_LAGARITH,
243 CODEC_ID_PRORES,
244 CODEC_ID_JV,
245 CODEC_ID_DFA,
246 CODEC_ID_WMV3IMAGE,
247 CODEC_ID_VC1IMAGE,
248 #if LIBAVCODEC_VERSION_MAJOR == 53
249 CODEC_ID_G723_1,
250 CODEC_ID_G729,
251 #endif
252 CODEC_ID_UTVIDEO,
253 CODEC_ID_BMV_VIDEO,
254 CODEC_ID_VBLE,
255 CODEC_ID_DXTORY,
256 CODEC_ID_V410,
257
258 /* various PCM "codecs" */
259 CODEC_ID_FIRST_AUDIO = 0x10000, ///< A dummy id pointing at the start of audio codecs
260 CODEC_ID_PCM_S16LE = 0x10000,
261 CODEC_ID_PCM_S16BE,
262 CODEC_ID_PCM_U16LE,
263 CODEC_ID_PCM_U16BE,
264 CODEC_ID_PCM_S8,
265 CODEC_ID_PCM_U8,
266 CODEC_ID_PCM_MULAW,
267 CODEC_ID_PCM_ALAW,
268 CODEC_ID_PCM_S32LE,
269 CODEC_ID_PCM_S32BE,
270 CODEC_ID_PCM_U32LE,
271 CODEC_ID_PCM_U32BE,
272 CODEC_ID_PCM_S24LE,
273 CODEC_ID_PCM_S24BE,
274 CODEC_ID_PCM_U24LE,
275 CODEC_ID_PCM_U24BE,
276 CODEC_ID_PCM_S24DAUD,
277 CODEC_ID_PCM_ZORK,
278 CODEC_ID_PCM_S16LE_PLANAR,
279 CODEC_ID_PCM_DVD,
280 CODEC_ID_PCM_F32BE,
281 CODEC_ID_PCM_F32LE,
282 CODEC_ID_PCM_F64BE,
283 CODEC_ID_PCM_F64LE,
284 CODEC_ID_PCM_BLURAY,
285 CODEC_ID_PCM_LXF,
286 CODEC_ID_S302M,
287 CODEC_ID_PCM_S8_PLANAR,
288
289 /* various ADPCM codecs */
290 CODEC_ID_ADPCM_IMA_QT = 0x11000,
291 CODEC_ID_ADPCM_IMA_WAV,
292 CODEC_ID_ADPCM_IMA_DK3,
293 CODEC_ID_ADPCM_IMA_DK4,
294 CODEC_ID_ADPCM_IMA_WS,
295 CODEC_ID_ADPCM_IMA_SMJPEG,
296 CODEC_ID_ADPCM_MS,
297 CODEC_ID_ADPCM_4XM,
298 CODEC_ID_ADPCM_XA,
299 CODEC_ID_ADPCM_ADX,
300 CODEC_ID_ADPCM_EA,
301 CODEC_ID_ADPCM_G726,
302 CODEC_ID_ADPCM_CT,
303 CODEC_ID_ADPCM_SWF,
304 CODEC_ID_ADPCM_YAMAHA,
305 CODEC_ID_ADPCM_SBPRO_4,
306 CODEC_ID_ADPCM_SBPRO_3,
307 CODEC_ID_ADPCM_SBPRO_2,
308 CODEC_ID_ADPCM_THP,
309 CODEC_ID_ADPCM_IMA_AMV,
310 CODEC_ID_ADPCM_EA_R1,
311 CODEC_ID_ADPCM_EA_R3,
312 CODEC_ID_ADPCM_EA_R2,
313 CODEC_ID_ADPCM_IMA_EA_SEAD,
314 CODEC_ID_ADPCM_IMA_EA_EACS,
315 CODEC_ID_ADPCM_EA_XAS,
316 CODEC_ID_ADPCM_EA_MAXIS_XA,
317 CODEC_ID_ADPCM_IMA_ISS,
318 CODEC_ID_ADPCM_G722,
319
320 /* AMR */
321 CODEC_ID_AMR_NB = 0x12000,
322 CODEC_ID_AMR_WB,
323
324 /* RealAudio codecs*/
325 CODEC_ID_RA_144 = 0x13000,
326 CODEC_ID_RA_288,
327
328 /* various DPCM codecs */
329 CODEC_ID_ROQ_DPCM = 0x14000,
330 CODEC_ID_INTERPLAY_DPCM,
331 CODEC_ID_XAN_DPCM,
332 CODEC_ID_SOL_DPCM,
333
334 /* audio codecs */
335 CODEC_ID_MP2 = 0x15000,
336 CODEC_ID_MP3, ///< preferred ID for decoding MPEG audio layer 1, 2 or 3
337 CODEC_ID_AAC,
338 CODEC_ID_AC3,
339 CODEC_ID_DTS,
340 CODEC_ID_VORBIS,
341 CODEC_ID_DVAUDIO,
342 CODEC_ID_WMAV1,
343 CODEC_ID_WMAV2,
344 CODEC_ID_MACE3,
345 CODEC_ID_MACE6,
346 CODEC_ID_VMDAUDIO,
347 #if LIBAVCODEC_VERSION_MAJOR == 53
348 CODEC_ID_SONIC,
349 CODEC_ID_SONIC_LS,
350 #endif
351 CODEC_ID_FLAC,
352 CODEC_ID_MP3ADU,
353 CODEC_ID_MP3ON4,
354 CODEC_ID_SHORTEN,
355 CODEC_ID_ALAC,
356 CODEC_ID_WESTWOOD_SND1,
357 CODEC_ID_GSM, ///< as in Berlin toast format
358 CODEC_ID_QDM2,
359 CODEC_ID_COOK,
360 CODEC_ID_TRUESPEECH,
361 CODEC_ID_TTA,
362 CODEC_ID_SMACKAUDIO,
363 CODEC_ID_QCELP,
364 CODEC_ID_WAVPACK,
365 CODEC_ID_DSICINAUDIO,
366 CODEC_ID_IMC,
367 CODEC_ID_MUSEPACK7,
368 CODEC_ID_MLP,
369 CODEC_ID_GSM_MS, /* as found in WAV */
370 CODEC_ID_ATRAC3,
371 CODEC_ID_VOXWARE,
372 CODEC_ID_APE,
373 CODEC_ID_NELLYMOSER,
374 CODEC_ID_MUSEPACK8,
375 CODEC_ID_SPEEX,
376 CODEC_ID_WMAVOICE,
377 CODEC_ID_WMAPRO,
378 CODEC_ID_WMALOSSLESS,
379 CODEC_ID_ATRAC3P,
380 CODEC_ID_EAC3,
381 CODEC_ID_SIPR,
382 CODEC_ID_MP1,
383 CODEC_ID_TWINVQ,
384 CODEC_ID_TRUEHD,
385 CODEC_ID_MP4ALS,
386 CODEC_ID_ATRAC1,
387 CODEC_ID_BINKAUDIO_RDFT,
388 CODEC_ID_BINKAUDIO_DCT,
389 CODEC_ID_AAC_LATM,
390 CODEC_ID_QDMC,
391 CODEC_ID_CELT,
392 #if LIBAVCODEC_VERSION_MAJOR > 53
393 CODEC_ID_G723_1,
394 CODEC_ID_G729,
395 CODEC_ID_8SVX_EXP,
396 CODEC_ID_8SVX_FIB,
397 #endif
398 CODEC_ID_BMV_AUDIO,
399
400 /* subtitle codecs */
401 CODEC_ID_FIRST_SUBTITLE = 0x17000, ///< A dummy ID pointing at the start of subtitle codecs.
402 CODEC_ID_DVD_SUBTITLE = 0x17000,
403 CODEC_ID_DVB_SUBTITLE,
404 CODEC_ID_TEXT, ///< raw UTF-8 text
405 CODEC_ID_XSUB,
406 CODEC_ID_SSA,
407 CODEC_ID_MOV_TEXT,
408 CODEC_ID_HDMV_PGS_SUBTITLE,
409 CODEC_ID_DVB_TELETEXT,
410 CODEC_ID_SRT,
411
412 /* other specific kind of codecs (generally used for attachments) */
413 CODEC_ID_FIRST_UNKNOWN = 0x18000, ///< A dummy ID pointing at the start of various fake codecs.
414 CODEC_ID_TTF = 0x18000,
415
416 CODEC_ID_PROBE = 0x19000, ///< codec_id is not known (like CODEC_ID_NONE) but lavf should attempt to identify it
417
418 CODEC_ID_MPEG2TS = 0x20000, /**< _FAKE_ codec to indicate a raw MPEG-2 TS
419 * stream (only used by libavformat) */
420 CODEC_ID_MPEG4SYSTEMS = 0x20001, /**< _FAKE_ codec to indicate a MPEG-4 Systems
421 * stream (only used by libavformat) */
422 CODEC_ID_FFMETADATA = 0x21000, ///< Dummy codec for streams containing only metadata information.
423 };
424
425 #if FF_API_OLD_SAMPLE_FMT
426 #define SampleFormat AVSampleFormat
427
428 #define SAMPLE_FMT_NONE AV_SAMPLE_FMT_NONE
429 #define SAMPLE_FMT_U8 AV_SAMPLE_FMT_U8
430 #define SAMPLE_FMT_S16 AV_SAMPLE_FMT_S16
431 #define SAMPLE_FMT_S32 AV_SAMPLE_FMT_S32
432 #define SAMPLE_FMT_FLT AV_SAMPLE_FMT_FLT
433 #define SAMPLE_FMT_DBL AV_SAMPLE_FMT_DBL
434 #define SAMPLE_FMT_NB AV_SAMPLE_FMT_NB
435 #endif
436
437 #if FF_API_OLD_AUDIOCONVERT
438 #include "libavutil/audioconvert.h"
439
440 /* Audio channel masks */
441 #define CH_FRONT_LEFT AV_CH_FRONT_LEFT
442 #define CH_FRONT_RIGHT AV_CH_FRONT_RIGHT
443 #define CH_FRONT_CENTER AV_CH_FRONT_CENTER
444 #define CH_LOW_FREQUENCY AV_CH_LOW_FREQUENCY
445 #define CH_BACK_LEFT AV_CH_BACK_LEFT
446 #define CH_BACK_RIGHT AV_CH_BACK_RIGHT
447 #define CH_FRONT_LEFT_OF_CENTER AV_CH_FRONT_LEFT_OF_CENTER
448 #define CH_FRONT_RIGHT_OF_CENTER AV_CH_FRONT_RIGHT_OF_CENTER
449 #define CH_BACK_CENTER AV_CH_BACK_CENTER
450 #define CH_SIDE_LEFT AV_CH_SIDE_LEFT
451 #define CH_SIDE_RIGHT AV_CH_SIDE_RIGHT
452 #define CH_TOP_CENTER AV_CH_TOP_CENTER
453 #define CH_TOP_FRONT_LEFT AV_CH_TOP_FRONT_LEFT
454 #define CH_TOP_FRONT_CENTER AV_CH_TOP_FRONT_CENTER
455 #define CH_TOP_FRONT_RIGHT AV_CH_TOP_FRONT_RIGHT
456 #define CH_TOP_BACK_LEFT AV_CH_TOP_BACK_LEFT
457 #define CH_TOP_BACK_CENTER AV_CH_TOP_BACK_CENTER
458 #define CH_TOP_BACK_RIGHT AV_CH_TOP_BACK_RIGHT
459 #define CH_STEREO_LEFT AV_CH_STEREO_LEFT
460 #define CH_STEREO_RIGHT AV_CH_STEREO_RIGHT
461
462 /** Channel mask value used for AVCodecContext.request_channel_layout
463 to indicate that the user requests the channel order of the decoder output
464 to be the native codec channel order. */
465 #define CH_LAYOUT_NATIVE AV_CH_LAYOUT_NATIVE
466
467 /* Audio channel convenience macros */
468 #define CH_LAYOUT_MONO AV_CH_LAYOUT_MONO
469 #define CH_LAYOUT_STEREO AV_CH_LAYOUT_STEREO
470 #define CH_LAYOUT_2_1 AV_CH_LAYOUT_2_1
471 #define CH_LAYOUT_SURROUND AV_CH_LAYOUT_SURROUND
472 #define CH_LAYOUT_4POINT0 AV_CH_LAYOUT_4POINT0
473 #define CH_LAYOUT_2_2 AV_CH_LAYOUT_2_2
474 #define CH_LAYOUT_QUAD AV_CH_LAYOUT_QUAD
475 #define CH_LAYOUT_5POINT0 AV_CH_LAYOUT_5POINT0
476 #define CH_LAYOUT_5POINT1 AV_CH_LAYOUT_5POINT1
477 #define CH_LAYOUT_5POINT0_BACK AV_CH_LAYOUT_5POINT0_BACK
478 #define CH_LAYOUT_5POINT1_BACK AV_CH_LAYOUT_5POINT1_BACK
479 #define CH_LAYOUT_7POINT0 AV_CH_LAYOUT_7POINT0
480 #define CH_LAYOUT_7POINT1 AV_CH_LAYOUT_7POINT1
481 #define CH_LAYOUT_7POINT1_WIDE AV_CH_LAYOUT_7POINT1_WIDE
482 #define CH_LAYOUT_STEREO_DOWNMIX AV_CH_LAYOUT_STEREO_DOWNMIX
483 #endif
484
485 #if FF_API_OLD_DECODE_AUDIO
486 /* in bytes */
487 #define AVCODEC_MAX_AUDIO_FRAME_SIZE 192000 // 1 second of 48khz 32bit audio
488 #endif
489
490 /**
491 * Required number of additionally allocated bytes at the end of the input bitstream for decoding.
492 * This is mainly needed because some optimized bitstream readers read
493 * 32 or 64 bit at once and could read over the end.<br>
494 * Note: If the first 23 bits of the additional bytes are not 0, then damaged
495 * MPEG bitstreams could cause overread and segfault.
496 */
497 #define FF_INPUT_BUFFER_PADDING_SIZE 8
498
499 /**
500 * minimum encoding buffer size
501 * Used to avoid some checks during header writing.
502 */
503 #define FF_MIN_BUFFER_SIZE 16384
504
505
506 /**
507 * motion estimation type.
508 */
509 enum Motion_Est_ID {
510 ME_ZERO = 1, ///< no search, that is use 0,0 vector whenever one is needed
511 ME_FULL,
512 ME_LOG,
513 ME_PHODS,
514 ME_EPZS, ///< enhanced predictive zonal search
515 ME_X1, ///< reserved for experiments
516 ME_HEX, ///< hexagon based search
517 ME_UMH, ///< uneven multi-hexagon search
518 ME_ITER, ///< iterative search
519 ME_TESA, ///< transformed exhaustive search algorithm
520 };
521
522 enum AVDiscard{
523 /* We leave some space between them for extensions (drop some
524 * keyframes for intra-only or drop just some bidir frames). */
525 AVDISCARD_NONE =-16, ///< discard nothing
526 AVDISCARD_DEFAULT= 0, ///< discard useless packets like 0 size packets in avi
527 AVDISCARD_NONREF = 8, ///< discard all non reference
528 AVDISCARD_BIDIR = 16, ///< discard all bidirectional frames
529 AVDISCARD_NONKEY = 32, ///< discard all frames except keyframes
530 AVDISCARD_ALL = 48, ///< discard all
531 };
532
533 enum AVColorPrimaries{
534 AVCOL_PRI_BT709 =1, ///< also ITU-R BT1361 / IEC 61966-2-4 / SMPTE RP177 Annex B
535 AVCOL_PRI_UNSPECIFIED=2,
536 AVCOL_PRI_BT470M =4,
537 AVCOL_PRI_BT470BG =5, ///< also ITU-R BT601-6 625 / ITU-R BT1358 625 / ITU-R BT1700 625 PAL & SECAM
538 AVCOL_PRI_SMPTE170M =6, ///< also ITU-R BT601-6 525 / ITU-R BT1358 525 / ITU-R BT1700 NTSC
539 AVCOL_PRI_SMPTE240M =7, ///< functionally identical to above
540 AVCOL_PRI_FILM =8,
541 AVCOL_PRI_NB , ///< Not part of ABI
542 };
543
544 enum AVColorTransferCharacteristic{
545 AVCOL_TRC_BT709 =1, ///< also ITU-R BT1361
546 AVCOL_TRC_UNSPECIFIED=2,
547 AVCOL_TRC_GAMMA22 =4, ///< also ITU-R BT470M / ITU-R BT1700 625 PAL & SECAM
548 AVCOL_TRC_GAMMA28 =5, ///< also ITU-R BT470BG
549 AVCOL_TRC_NB , ///< Not part of ABI
550 };
551
552 enum AVColorSpace{
553 AVCOL_SPC_RGB =0,
554 AVCOL_SPC_BT709 =1, ///< also ITU-R BT1361 / IEC 61966-2-4 xvYCC709 / SMPTE RP177 Annex B
555 AVCOL_SPC_UNSPECIFIED=2,
556 AVCOL_SPC_FCC =4,
557 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
558 AVCOL_SPC_SMPTE170M =6, ///< also ITU-R BT601-6 525 / ITU-R BT1358 525 / ITU-R BT1700 NTSC / functionally identical to above
559 AVCOL_SPC_SMPTE240M =7,
560 AVCOL_SPC_NB , ///< Not part of ABI
561 };
562
563 enum AVColorRange{
564 AVCOL_RANGE_UNSPECIFIED=0,
565 AVCOL_RANGE_MPEG =1, ///< the normal 219*2^(n-8) "MPEG" YUV ranges
566 AVCOL_RANGE_JPEG =2, ///< the normal 2^n-1 "JPEG" YUV ranges
567 AVCOL_RANGE_NB , ///< Not part of ABI
568 };
569
570 /**
571 * X X 3 4 X X are luma samples,
572 * 1 2 1-6 are possible chroma positions
573 * X X 5 6 X 0 is undefined/unknown position
574 */
575 enum AVChromaLocation{
576 AVCHROMA_LOC_UNSPECIFIED=0,
577 AVCHROMA_LOC_LEFT =1, ///< mpeg2/4, h264 default
578 AVCHROMA_LOC_CENTER =2, ///< mpeg1, jpeg, h263
579 AVCHROMA_LOC_TOPLEFT =3, ///< DV
580 AVCHROMA_LOC_TOP =4,
581 AVCHROMA_LOC_BOTTOMLEFT =5,
582 AVCHROMA_LOC_BOTTOM =6,
583 AVCHROMA_LOC_NB , ///< Not part of ABI
584 };
585
586 #if FF_API_FLAC_GLOBAL_OPTS
587 /**
588 * LPC analysis type
589 */
590 enum AVLPCType {
591 AV_LPC_TYPE_DEFAULT = -1, ///< use the codec default LPC type
592 AV_LPC_TYPE_NONE = 0, ///< do not use LPC prediction or use all zero coefficients
593 AV_LPC_TYPE_FIXED = 1, ///< fixed LPC coefficients
594 AV_LPC_TYPE_LEVINSON = 2, ///< Levinson-Durbin recursion
595 AV_LPC_TYPE_CHOLESKY = 3, ///< Cholesky factorization
596 AV_LPC_TYPE_NB , ///< Not part of ABI
597 };
598 #endif
599
600 enum AVAudioServiceType {
601 AV_AUDIO_SERVICE_TYPE_MAIN = 0,
602 AV_AUDIO_SERVICE_TYPE_EFFECTS = 1,
603 AV_AUDIO_SERVICE_TYPE_VISUALLY_IMPAIRED = 2,
604 AV_AUDIO_SERVICE_TYPE_HEARING_IMPAIRED = 3,
605 AV_AUDIO_SERVICE_TYPE_DIALOGUE = 4,
606 AV_AUDIO_SERVICE_TYPE_COMMENTARY = 5,
607 AV_AUDIO_SERVICE_TYPE_EMERGENCY = 6,
608 AV_AUDIO_SERVICE_TYPE_VOICE_OVER = 7,
609 AV_AUDIO_SERVICE_TYPE_KARAOKE = 8,
610 AV_AUDIO_SERVICE_TYPE_NB , ///< Not part of ABI
611 };
612
613 typedef struct RcOverride{
614 int start_frame;
615 int end_frame;
616 int qscale; // If this is 0 then quality_factor will be used instead.
617 float quality_factor;
618 } RcOverride;
619
620 #define FF_MAX_B_FRAMES 16
621
622 /* encoding support
623 These flags can be passed in AVCodecContext.flags before initialization.
624 Note: Not everything is supported yet.
625 */
626
627 #define CODEC_FLAG_QSCALE 0x0002 ///< Use fixed qscale.
628 #define CODEC_FLAG_4MV 0x0004 ///< 4 MV per MB allowed / advanced prediction for H.263.
629 #define CODEC_FLAG_QPEL 0x0010 ///< Use qpel MC.
630 #define CODEC_FLAG_GMC 0x0020 ///< Use GMC.
631 #define CODEC_FLAG_MV0 0x0040 ///< Always try a MB with MV=<0,0>.
632 /**
633 * The parent program guarantees that the input for B-frames containing
634 * streams is not written to for at least s->max_b_frames+1 frames, if
635 * this is not set the input will be copied.
636 */
637 #define CODEC_FLAG_INPUT_PRESERVED 0x0100
638 #define CODEC_FLAG_PASS1 0x0200 ///< Use internal 2pass ratecontrol in first pass mode.
639 #define CODEC_FLAG_PASS2 0x0400 ///< Use internal 2pass ratecontrol in second pass mode.
640 #define CODEC_FLAG_GRAY 0x2000 ///< Only decode/encode grayscale.
641 #define CODEC_FLAG_EMU_EDGE 0x4000 ///< Don't draw edges.
642 #define CODEC_FLAG_PSNR 0x8000 ///< error[?] variables will be set during encoding.
643 #define CODEC_FLAG_TRUNCATED 0x00010000 /** Input bitstream might be truncated at a random
644 location instead of only at frame boundaries. */
645 #define CODEC_FLAG_NORMALIZE_AQP 0x00020000 ///< Normalize adaptive quantization.
646 #define CODEC_FLAG_INTERLACED_DCT 0x00040000 ///< Use interlaced DCT.
647 #define CODEC_FLAG_LOW_DELAY 0x00080000 ///< Force low delay.
648 #define CODEC_FLAG_GLOBAL_HEADER 0x00400000 ///< Place global headers in extradata instead of every keyframe.
649 #define CODEC_FLAG_BITEXACT 0x00800000 ///< Use only bitexact stuff (except (I)DCT).
650 /* Fx : Flag for h263+ extra options */
651 #define CODEC_FLAG_AC_PRED 0x01000000 ///< H.263 advanced intra coding / MPEG-4 AC prediction
652 #define CODEC_FLAG_CBP_RD 0x04000000 ///< Use rate distortion optimization for cbp.
653 #define CODEC_FLAG_QP_RD 0x08000000 ///< Use rate distortion optimization for qp selectioon.
654 #define CODEC_FLAG_LOOP_FILTER 0x00000800 ///< loop filter
655 #define CODEC_FLAG_INTERLACED_ME 0x20000000 ///< interlaced motion estimation
656 #define CODEC_FLAG_CLOSED_GOP 0x80000000
657 #define CODEC_FLAG2_FAST 0x00000001 ///< Allow non spec compliant speedup tricks.
658 #define CODEC_FLAG2_STRICT_GOP 0x00000002 ///< Strictly enforce GOP size.
659 #define CODEC_FLAG2_NO_OUTPUT 0x00000004 ///< Skip bitstream encoding.
660 #define CODEC_FLAG2_LOCAL_HEADER 0x00000008 ///< Place global headers at every keyframe instead of in extradata.
661 #define CODEC_FLAG2_SKIP_RD 0x00004000 ///< RD optimal MB level residual skipping
662 #define CODEC_FLAG2_CHUNKS 0x00008000 ///< Input bitstream might be truncated at a packet boundaries instead of only at frame boundaries.
663 /**
664 * @defgroup deprecated_flags Deprecated codec flags
665 * Use corresponding private codec options instead.
666 * @{
667 */
668 #if FF_API_MPEGVIDEO_GLOBAL_OPTS
669 #define CODEC_FLAG_OBMC 0x00000001 ///< OBMC
670 #define CODEC_FLAG_H263P_AIV 0x00000008 ///< H.263 alternative inter VLC
671 #define CODEC_FLAG_PART 0x0080 ///< Use data partitioning.
672 #define CODEC_FLAG_ALT_SCAN 0x00100000 ///< Use alternate scan.
673 #define CODEC_FLAG_H263P_UMV 0x02000000 ///< unlimited motion vector
674 #define CODEC_FLAG_H263P_SLICE_STRUCT 0x10000000
675 #define CODEC_FLAG_SVCD_SCAN_OFFSET 0x40000000 ///< Will reserve space for SVCD scan offset user data.
676 #define CODEC_FLAG2_INTRA_VLC 0x00000800 ///< Use MPEG-2 intra VLC table.
677 #define CODEC_FLAG2_DROP_FRAME_TIMECODE 0x00002000 ///< timecode is in drop frame format.
678 #define CODEC_FLAG2_NON_LINEAR_QUANT 0x00010000 ///< Use MPEG-2 nonlinear quantizer.
679 #endif
680 #if FF_API_MJPEG_GLOBAL_OPTS
681 #define CODEC_FLAG_EXTERN_HUFF 0x1000 ///< Use external Huffman table (for MJPEG).
682 #endif
683 #if FF_API_X264_GLOBAL_OPTS
684 #define CODEC_FLAG2_BPYRAMID 0x00000010 ///< H.264 allow B-frames to be used as references.
685 #define CODEC_FLAG2_WPRED 0x00000020 ///< H.264 weighted biprediction for B-frames
686 #define CODEC_FLAG2_MIXED_REFS 0x00000040 ///< H.264 one reference per partition, as opposed to one reference per macroblock
687 #define CODEC_FLAG2_8X8DCT 0x00000080 ///< H.264 high profile 8x8 transform
688 #define CODEC_FLAG2_FASTPSKIP 0x00000100 ///< H.264 fast pskip
689 #define CODEC_FLAG2_AUD 0x00000200 ///< H.264 access unit delimiters
690 #define CODEC_FLAG2_BRDO 0x00000400 ///< B-frame rate-distortion optimization
691 #define CODEC_FLAG2_MBTREE 0x00040000 ///< Use macroblock tree ratecontrol (x264 only)
692 #define CODEC_FLAG2_PSY 0x00080000 ///< Use psycho visual optimizations.
693 #define CODEC_FLAG2_SSIM 0x00100000 ///< Compute SSIM during encoding, error[] values are undefined.
694 #define CODEC_FLAG2_INTRA_REFRESH 0x00200000 ///< Use periodic insertion of intra blocks instead of keyframes.
695 #endif
696 #if FF_API_SNOW_GLOBAL_OPTS
697 #define CODEC_FLAG2_MEMC_ONLY 0x00001000 ///< Only do ME/MC (I frames -> ref, P frame -> ME+MC).
698 #endif
699 #if FF_API_LAME_GLOBAL_OPTS
700 #define CODEC_FLAG2_BIT_RESERVOIR 0x00020000 ///< Use a bit reservoir when encoding if possible
701 #endif
702 /**
703 * @}
704 */
705
706 /* Unsupported options :
707 * Syntax Arithmetic coding (SAC)
708 * Reference Picture Selection
709 * Independent Segment Decoding */
710 /* /Fx */
711 /* codec capabilities */
712
713 #define CODEC_CAP_DRAW_HORIZ_BAND 0x0001 ///< Decoder can use draw_horiz_band callback.
714 /**
715 * Codec uses get_buffer() for allocating buffers and supports custom allocators.
716 * If not set, it might not use get_buffer() at all or use operations that
717 * assume the buffer was allocated by avcodec_default_get_buffer.
718 */
719 #define CODEC_CAP_DR1 0x0002
720 #if FF_API_PARSE_FRAME
721 /* If 'parse_only' field is true, then avcodec_parse_frame() can be used. */
722 #define CODEC_CAP_PARSE_ONLY 0x0004
723 #endif
724 #define CODEC_CAP_TRUNCATED 0x0008
725 /* Codec can export data for HW decoding (XvMC). */
726 #define CODEC_CAP_HWACCEL 0x0010
727 /**
728 * Encoder or decoder requires flushing with NULL input at the end in order to
729 * give the complete and correct output.
730 *
731 * NOTE: If this flag is not set, the codec is guaranteed to never be fed with
732 * with NULL data. The user can still send NULL data to the public encode
733 * or decode function, but libavcodec will not pass it along to the codec
734 * unless this flag is set.
735 *
736 * Decoders:
737 * The decoder has a non-zero delay and needs to be fed with avpkt->data=NULL,
738 * avpkt->size=0 at the end to get the delayed data until the decoder no longer
739 * returns frames.
740 *
741 * Encoders:
742 * The encoder needs to be fed with NULL data at the end of encoding until the
743 * encoder no longer returns data.
744 */
745 #define CODEC_CAP_DELAY 0x0020
746 /**
747 * Codec can be fed a final frame with a smaller size.
748 * This can be used to prevent truncation of the last audio samples.
749 */
750 #define CODEC_CAP_SMALL_LAST_FRAME 0x0040
751 /**
752 * Codec can export data for HW decoding (VDPAU).
753 */
754 #define CODEC_CAP_HWACCEL_VDPAU 0x0080
755 /**
756 * Codec can output multiple frames per AVPacket
757 * Normally demuxers return one frame at a time, demuxers which do not do
758 * are connected to a parser to split what they return into proper frames.
759 * This flag is reserved to the very rare category of codecs which have a
760 * bitstream that cannot be split into frames without timeconsuming
761 * operations like full decoding. Demuxers carring such bitstreams thus
762 * may return multiple frames in a packet. This has many disadvantages like
763 * prohibiting stream copy in many cases thus it should only be considered
764 * as a last resort.
765 */
766 #define CODEC_CAP_SUBFRAMES 0x0100
767 /**
768 * Codec is experimental and is thus avoided in favor of non experimental
769 * encoders
770 */
771 #define CODEC_CAP_EXPERIMENTAL 0x0200
772 /**
773 * Codec should fill in channel configuration and samplerate instead of container
774 */
775 #define CODEC_CAP_CHANNEL_CONF 0x0400
776 /**
777 * Codec is able to deal with negative linesizes
778 */
779 #define CODEC_CAP_NEG_LINESIZES 0x0800
780 /**
781 * Codec supports frame-level multithreading.
782 */
783 #define CODEC_CAP_FRAME_THREADS 0x1000
784 /**
785 * Codec supports slice-based (or partition-based) multithreading.
786 */
787 #define CODEC_CAP_SLICE_THREADS 0x2000
788 /**
789 * Codec supports changed parameters at any point.
790 */
791 #define CODEC_CAP_PARAM_CHANGE 0x4000
792 /**
793 * Codec supports avctx->thread_count == 0 (auto).
794 */
795 #define CODEC_CAP_AUTO_THREADS 0x8000
796
797 //The following defines may change, don't expect compatibility if you use them.
798 #define MB_TYPE_INTRA4x4 0x0001
799 #define MB_TYPE_INTRA16x16 0x0002 //FIXME H.264-specific
800 #define MB_TYPE_INTRA_PCM 0x0004 //FIXME H.264-specific
801 #define MB_TYPE_16x16 0x0008
802 #define MB_TYPE_16x8 0x0010
803 #define MB_TYPE_8x16 0x0020
804 #define MB_TYPE_8x8 0x0040
805 #define MB_TYPE_INTERLACED 0x0080
806 #define MB_TYPE_DIRECT2 0x0100 //FIXME
807 #define MB_TYPE_ACPRED 0x0200
808 #define MB_TYPE_GMC 0x0400
809 #define MB_TYPE_SKIP 0x0800
810 #define MB_TYPE_P0L0 0x1000
811 #define MB_TYPE_P1L0 0x2000
812 #define MB_TYPE_P0L1 0x4000
813 #define MB_TYPE_P1L1 0x8000
814 #define MB_TYPE_L0 (MB_TYPE_P0L0 | MB_TYPE_P1L0)
815 #define MB_TYPE_L1 (MB_TYPE_P0L1 | MB_TYPE_P1L1)
816 #define MB_TYPE_L0L1 (MB_TYPE_L0 | MB_TYPE_L1)
817 #define MB_TYPE_QUANT 0x00010000
818 #define MB_TYPE_CBP 0x00020000
819 //Note bits 24-31 are reserved for codec specific use (h264 ref0, mpeg1 0mv, ...)
820
821 /**
822 * Pan Scan area.
823 * This specifies the area which should be displayed.
824 * Note there may be multiple such areas for one frame.
825 */
826 typedef struct AVPanScan{
827 /**
828 * id
829 * - encoding: Set by user.
830 * - decoding: Set by libavcodec.
831 */
832 int id;
833
834 /**
835 * width and height in 1/16 pel
836 * - encoding: Set by user.
837 * - decoding: Set by libavcodec.
838 */
839 int width;
840 int height;
841
842 /**
843 * position of the top left corner in 1/16 pel for up to 3 fields/frames
844 * - encoding: Set by user.
845 * - decoding: Set by libavcodec.
846 */
847 int16_t position[3][2];
848 }AVPanScan;
849
850 #define FF_QSCALE_TYPE_MPEG1 0
851 #define FF_QSCALE_TYPE_MPEG2 1
852 #define FF_QSCALE_TYPE_H264 2
853 #define FF_QSCALE_TYPE_VP56 3
854
855 #define FF_BUFFER_TYPE_INTERNAL 1
856 #define FF_BUFFER_TYPE_USER 2 ///< direct rendering buffers (image is (de)allocated by user)
857 #define FF_BUFFER_TYPE_SHARED 4 ///< Buffer from somewhere else; don't deallocate image (data/base), all other tables are not shared.
858 #define FF_BUFFER_TYPE_COPY 8 ///< Just a (modified) copy of some other buffer, don't deallocate anything.
859
860 #if FF_API_OLD_FF_PICT_TYPES
861 /* DEPRECATED, directly use the AV_PICTURE_TYPE_* enum values */
862 #define FF_I_TYPE AV_PICTURE_TYPE_I ///< Intra
863 #define FF_P_TYPE AV_PICTURE_TYPE_P ///< Predicted
864 #define FF_B_TYPE AV_PICTURE_TYPE_B ///< Bi-dir predicted
865 #define FF_S_TYPE AV_PICTURE_TYPE_S ///< S(GMC)-VOP MPEG4
866 #define FF_SI_TYPE AV_PICTURE_TYPE_SI ///< Switching Intra
867 #define FF_SP_TYPE AV_PICTURE_TYPE_SP ///< Switching Predicted
868 #define FF_BI_TYPE AV_PICTURE_TYPE_BI
869 #endif
870
871 #define FF_BUFFER_HINTS_VALID 0x01 // Buffer hints value is meaningful (if 0 ignore).
872 #define FF_BUFFER_HINTS_READABLE 0x02 // Codec will read from buffer.
873 #define FF_BUFFER_HINTS_PRESERVE 0x04 // User must not alter buffer content.
874 #define FF_BUFFER_HINTS_REUSABLE 0x08 // Codec will reuse the buffer (update).
875
876 enum AVPacketSideDataType {
877 AV_PKT_DATA_PALETTE,
878 AV_PKT_DATA_NEW_EXTRADATA,
879 AV_PKT_DATA_PARAM_CHANGE,
880 };
881
882 typedef struct AVPacket {
883 /**
884 * Presentation timestamp in AVStream->time_base units; the time at which
885 * the decompressed packet will be presented to the user.
886 * Can be AV_NOPTS_VALUE if it is not stored in the file.
887 * pts MUST be larger or equal to dts as presentation cannot happen before
888 * decompression, unless one wants to view hex dumps. Some formats misuse
889 * the terms dts and pts/cts to mean something different. Such timestamps
890 * must be converted to true pts/dts before they are stored in AVPacket.
891 */
892 int64_t pts;
893 /**
894 * Decompression timestamp in AVStream->time_base units; the time at which
895 * the packet is decompressed.
896 * Can be AV_NOPTS_VALUE if it is not stored in the file.
897 */
898 int64_t dts;
899 uint8_t *data;
900 int size;
901 int stream_index;
902 /**
903 * A combination of AV_PKT_FLAG values
904 */
905 int flags;
906 /**
907 * Additional packet data that can be provided by the container.
908 * Packet can contain several types of side information.
909 */
910 struct {
911 uint8_t *data;
912 int size;
913 enum AVPacketSideDataType type;
914 } *side_data;
915 int side_data_elems;
916
917 /**
918 * Duration of this packet in AVStream->time_base units, 0 if unknown.
919 * Equals next_pts - this_pts in presentation order.
920 */
921 int duration;
922 void (*destruct)(struct AVPacket *);
923 void *priv;
924 int64_t pos; ///< byte position in stream, -1 if unknown
925
926 /**
927 * Time difference in AVStream->time_base units from the pts of this
928 * packet to the point at which the output from the decoder has converged
929 * independent from the availability of previous frames. That is, the
930 * frames are virtually identical no matter if decoding started from
931 * the very first frame or from this keyframe.
932 * Is AV_NOPTS_VALUE if unknown.
933 * This field is not the display duration of the current packet.
934 * This field has no meaning if the packet does not have AV_PKT_FLAG_KEY
935 * set.
936 *
937 * The purpose of this field is to allow seeking in streams that have no
938 * keyframes in the conventional sense. It corresponds to the
939 * recovery point SEI in H.264 and match_time_delta in NUT. It is also
940 * essential for some types of subtitle streams to ensure that all
941 * subtitles are correctly displayed after seeking.
942 */
943 int64_t convergence_duration;
944 } AVPacket;
945 #define AV_PKT_FLAG_KEY 0x0001 ///< The packet contains a keyframe
946 #define AV_PKT_FLAG_CORRUPT 0x0002 ///< The packet content is corrupted
947
948 /**
949 * An AV_PKT_DATA_PARAM_CHANGE side data packet is laid out as follows:
950 * u32le param_flags
951 * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_COUNT)
952 * s32le channel_count
953 * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_LAYOUT)
954 * u64le channel_layout
955 * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_SAMPLE_RATE)
956 * s32le sample_rate
957 * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_DIMENSIONS)
958 * s32le width
959 * s32le height
960 */
961
962 enum AVSideDataParamChangeFlags {
963 AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_COUNT = 0x0001,
964 AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_LAYOUT = 0x0002,
965 AV_SIDE_DATA_PARAM_CHANGE_SAMPLE_RATE = 0x0004,
966 AV_SIDE_DATA_PARAM_CHANGE_DIMENSIONS = 0x0008,
967 };
968
969 /**
970 * Audio Video Frame.
971 * New fields can be added to the end of AVFRAME with minor version
972 * bumps. Removal, reordering and changes to existing fields require
973 * a major version bump.
974 * sizeof(AVFrame) must not be used outside libav*.
975 */
976 typedef struct AVFrame {
977 #if FF_API_DATA_POINTERS
978 #define AV_NUM_DATA_POINTERS 4
979 #else
980 #define AV_NUM_DATA_POINTERS 8
981 #endif
982 /**
983 * pointer to the picture/channel planes.
984 * This might be different from the first allocated byte
985 * - encoding: Set by user
986 * - decoding: set by AVCodecContext.get_buffer()
987 */
988 uint8_t *data[AV_NUM_DATA_POINTERS];
989
990 /**
991 * Size, in bytes, of the data for each picture/channel plane.
992 *
993 * For audio, only linesize[0] may be set. For planar audio, each channel
994 * plane must be the same size.
995 *
996 * - encoding: Set by user (video only)
997 * - decoding: set by AVCodecContext.get_buffer()
998 */
999 int linesize[AV_NUM_DATA_POINTERS];
1000
1001 /**
1002 * pointer to the first allocated byte of the picture. Can be used in get_buffer/release_buffer.
1003 * This isn't used by libavcodec unless the default get/release_buffer() is used.
1004 * - encoding:
1005 * - decoding:
1006 */
1007 uint8_t *base[AV_NUM_DATA_POINTERS];
1008 /**
1009 * 1 -> keyframe, 0-> not
1010 * - encoding: Set by libavcodec.
1011 * - decoding: Set by libavcodec.
1012 */
1013 int key_frame;
1014
1015 /**
1016 * Picture type of the frame, see ?_TYPE below.
1017 * - encoding: Set by libavcodec. for coded_picture (and set by user for input).
1018 * - decoding: Set by libavcodec.
1019 */
1020 enum AVPictureType pict_type;
1021
1022 /**
1023 * presentation timestamp in time_base units (time when frame should be shown to user)
1024 * If AV_NOPTS_VALUE then frame_rate = 1/time_base will be assumed.
1025 * - encoding: MUST be set by user.
1026 * - decoding: Set by libavcodec.
1027 */
1028 int64_t pts;
1029
1030 /**
1031 * picture number in bitstream order
1032 * - encoding: set by
1033 * - decoding: Set by libavcodec.
1034 */
1035 int coded_picture_number;
1036 /**
1037 * picture number in display order
1038 * - encoding: set by
1039 * - decoding: Set by libavcodec.
1040 */
1041 int display_picture_number;
1042
1043 /**
1044 * quality (between 1 (good) and FF_LAMBDA_MAX (bad))
1045 * - encoding: Set by libavcodec. for coded_picture (and set by user for input).
1046 * - decoding: Set by libavcodec.
1047 */
1048 int quality;
1049
1050 #if FF_API_AVFRAME_AGE
1051 /**
1052 * @deprecated unused
1053 */
1054 attribute_deprecated int age;
1055 #endif
1056
1057 /**
1058 * is this picture used as reference
1059 * The values for this are the same as the MpegEncContext.picture_structure
1060 * variable, that is 1->top field, 2->bottom field, 3->frame/both fields.
1061 * Set to 4 for delayed, non-reference frames.
1062 * - encoding: unused
1063 * - decoding: Set by libavcodec. (before get_buffer() call)).
1064 */
1065 int reference;
1066
1067 /**
1068 * QP table
1069 * - encoding: unused
1070 * - decoding: Set by libavcodec.
1071 */
1072 int8_t *qscale_table;
1073 /**
1074 * QP store stride
1075 * - encoding: unused
1076 * - decoding: Set by libavcodec.
1077 */
1078 int qstride;
1079
1080 /**
1081 * mbskip_table[mb]>=1 if MB didn't change
1082 * stride= mb_width = (width+15)>>4
1083 * - encoding: unused
1084 * - decoding: Set by libavcodec.
1085 */
1086 uint8_t *mbskip_table;
1087
1088 /**
1089 * motion vector table
1090 * @code
1091 * example:
1092 * int mv_sample_log2= 4 - motion_subsample_log2;
1093 * int mb_width= (width+15)>>4;
1094 * int mv_stride= (mb_width << mv_sample_log2) + 1;
1095 * motion_val[direction][x + y*mv_stride][0->mv_x, 1->mv_y];
1096 * @endcode
1097 * - encoding: Set by user.
1098 * - decoding: Set by libavcodec.
1099 */
1100 int16_t (*motion_val[2])[2];
1101
1102 /**
1103 * macroblock type table
1104 * mb_type_base + mb_width + 2
1105 * - encoding: Set by user.
1106 * - decoding: Set by libavcodec.
1107 */
1108 uint32_t *mb_type;
1109
1110 /**
1111 * log2 of the size of the block which a single vector in motion_val represents:
1112 * (4->16x16, 3->8x8, 2-> 4x4, 1-> 2x2)
1113 * - encoding: unused
1114 * - decoding: Set by libavcodec.
1115 */
1116 uint8_t motion_subsample_log2;
1117
1118 /**
1119 * for some private data of the user
1120 * - encoding: unused
1121 * - decoding: Set by user.
1122 */
1123 void *opaque;
1124
1125 /**
1126 * error
1127 * - encoding: Set by libavcodec. if flags&CODEC_FLAG_PSNR.
1128 * - decoding: unused
1129 */
1130 uint64_t error[AV_NUM_DATA_POINTERS];
1131
1132 /**
1133 * type of the buffer (to keep track of who has to deallocate data[*])
1134 * - encoding: Set by the one who allocates it.
1135 * - decoding: Set by the one who allocates it.
1136 * Note: User allocated (direct rendering) & internal buffers cannot coexist currently.
1137 */
1138 int type;
1139
1140 /**
1141 * When decoding, this signals how much the picture must be delayed.
1142 * extra_delay = repeat_pict / (2*fps)
1143 * - encoding: unused
1144 * - decoding: Set by libavcodec.
1145 */
1146 int repeat_pict;
1147
1148 /**
1149 *
1150 */
1151 int qscale_type;
1152
1153 /**
1154 * The content of the picture is interlaced.
1155 * - encoding: Set by user.
1156 * - decoding: Set by libavcodec. (default 0)
1157 */
1158 int interlaced_frame;
1159
1160 /**
1161 * If the content is interlaced, is top field displayed first.
1162 * - encoding: Set by user.
1163 * - decoding: Set by libavcodec.
1164 */
1165 int top_field_first;
1166
1167 /**
1168 * Pan scan.
1169 * - encoding: Set by user.
1170 * - decoding: Set by libavcodec.
1171 */
1172 AVPanScan *pan_scan;
1173
1174 /**
1175 * Tell user application that palette has changed from previous frame.
1176 * - encoding: ??? (no palette-enabled encoder yet)
1177 * - decoding: Set by libavcodec. (default 0).
1178 */
1179 int palette_has_changed;
1180
1181 /**
1182 * codec suggestion on buffer type if != 0
1183 * - encoding: unused
1184 * - decoding: Set by libavcodec. (before get_buffer() call)).
1185 */
1186 int buffer_hints;
1187
1188 /**
1189 * DCT coefficients
1190 * - encoding: unused
1191 * - decoding: Set by libavcodec.
1192 */
1193 short *dct_coeff;
1194
1195 /**
1196 * motion reference frame index
1197 * the order in which these are stored can depend on the codec.
1198 * - encoding: Set by user.
1199 * - decoding: Set by libavcodec.
1200 */
1201 int8_t *ref_index[2];
1202
1203 /**
1204 * reordered opaque 64bit (generally an integer or a double precision float
1205 * PTS but can be anything).
1206 * The user sets AVCodecContext.reordered_opaque to represent the input at
1207 * that time,
1208 * the decoder reorders values as needed and sets AVFrame.reordered_opaque
1209 * to exactly one of the values provided by the user through AVCodecContext.reordered_opaque
1210 * @deprecated in favor of pkt_pts
1211 * - encoding: unused
1212 * - decoding: Read by user.
1213 */
1214 int64_t reordered_opaque;
1215
1216 /**
1217 * hardware accelerator private data (Libav-allocated)
1218 * - encoding: unused
1219 * - decoding: Set by libavcodec
1220 */
1221 void *hwaccel_picture_private;
1222
1223 /**
1224 * reordered pts from the last AVPacket that has been input into the decoder
1225 * - encoding: unused
1226 * - decoding: Read by user.
1227 */
1228 int64_t pkt_pts;
1229
1230 /**
1231 * dts from the last AVPacket that has been input into the decoder
1232 * - encoding: unused
1233 * - decoding: Read by user.
1234 */
1235 int64_t pkt_dts;
1236
1237 /**
1238 * the AVCodecContext which ff_thread_get_buffer() was last called on
1239 * - encoding: Set by libavcodec.
1240 * - decoding: Set by libavcodec.
1241 */
1242 struct AVCodecContext *owner;
1243
1244 /**
1245 * used by multithreading to store frame-specific info
1246 * - encoding: Set by libavcodec.
1247 * - decoding: Set by libavcodec.
1248 */
1249 void *thread_opaque;
1250
1251 /**
1252 * number of audio samples (per channel) described by this frame
1253 * - encoding: unused
1254 * - decoding: Set by libavcodec
1255 */
1256 int nb_samples;
1257
1258 /**
1259 * pointers to the data planes/channels.
1260 *
1261 * For video, this should simply point to data[].
1262 *
1263 * For planar audio, each channel has a separate data pointer, and
1264 * linesize[0] contains the size of each channel buffer.
1265 * For packed audio, there is just one data pointer, and linesize[0]
1266 * contains the total size of the buffer for all channels.
1267 *
1268 * Note: Both data and extended_data will always be set by get_buffer(),
1269 * but for planar audio with more channels that can fit in data,
1270 * extended_data must be used by the decoder in order to access all
1271 * channels.
1272 *
1273 * encoding: unused
1274 * decoding: set by AVCodecContext.get_buffer()
1275 */
1276 uint8_t **extended_data;
1277
1278 /**
1279 * sample aspect ratio for the video frame, 0/1 if unknown\unspecified
1280 * - encoding: unused
1281 * - decoding: Read by user.
1282 */
1283 AVRational sample_aspect_ratio;
1284
1285 /**
1286 * width and height of the video frame
1287 * - encoding: unused
1288 * - decoding: Read by user.
1289 */
1290 int width, height;
1291
1292 /**
1293 * format of the frame, -1 if unknown or unset
1294 * Values correspond to enum PixelFormat for video frames,
1295 * enum AVSampleFormat for audio)
1296 * - encoding: unused
1297 * - decoding: Read by user.
1298 */
1299 int format;
1300 } AVFrame;
1301
1302 struct AVCodecInternal;
1303
1304 enum AVFieldOrder {
1305 AV_FIELD_UNKNOWN,
1306 AV_FIELD_PROGRESSIVE,
1307 AV_FIELD_TT, //< Top coded_first, top displayed first
1308 AV_FIELD_BB, //< Bottom coded first, bottom displayed first
1309 AV_FIELD_TB, //< Top coded first, bottom displayed first
1310 AV_FIELD_BT, //< Bottom coded first, top displayed first
1311 };
1312
1313 /**
1314 * main external API structure.
1315 * New fields can be added to the end with minor version bumps.
1316 * Removal, reordering and changes to existing fields require a major
1317 * version bump.
1318 * sizeof(AVCodecContext) must not be used outside libav*.
1319 */
1320 typedef struct AVCodecContext {
1321 /**
1322 * information on struct for av_log
1323 * - set by avcodec_alloc_context3
1324 */
1325 const AVClass *av_class;
1326 /**
1327 * the average bitrate
1328 * - encoding: Set by user; unused for constant quantizer encoding.
1329 * - decoding: Set by libavcodec. 0 or some bitrate if this info is available in the stream.
1330 */
1331 int bit_rate;
1332
1333 /**
1334 * number of bits the bitstream is allowed to diverge from the reference.
1335 * the reference can be CBR (for CBR pass1) or VBR (for pass2)
1336 * - encoding: Set by user; unused for constant quantizer encoding.
1337 * - decoding: unused
1338 */
1339 int bit_rate_tolerance;
1340
1341 /**
1342 * CODEC_FLAG_*.
1343 * - encoding: Set by user.
1344 * - decoding: Set by user.
1345 */
1346 int flags;
1347
1348 /**
1349 * Some codecs need additional format info. It is stored here.
1350 * If any muxer uses this then ALL demuxers/parsers AND encoders for the
1351 * specific codec MUST set it correctly otherwise stream copy breaks.
1352 * In general use of this field by muxers is not recommended.
1353 * - encoding: Set by libavcodec.
1354 * - decoding: Set by libavcodec. (FIXME: Is this OK?)
1355 */
1356 int sub_id;
1357
1358 /**
1359 * Motion estimation algorithm used for video coding.
1360 * 1 (zero), 2 (full), 3 (log), 4 (phods), 5 (epzs), 6 (x1), 7 (hex),
1361 * 8 (umh), 9 (iter), 10 (tesa) [7, 8, 10 are x264 specific, 9 is snow specific]
1362 * - encoding: MUST be set by user.
1363 * - decoding: unused
1364 */
1365 int me_method;
1366
1367 /**
1368 * some codecs need / can use extradata like Huffman tables.
1369 * mjpeg: Huffman tables
1370 * rv10: additional flags
1371 * mpeg4: global headers (they can be in the bitstream or here)
1372 * The allocated memory should be FF_INPUT_BUFFER_PADDING_SIZE bytes larger
1373 * than extradata_size to avoid prolems if it is read with the bitstream reader.
1374 * The bytewise contents of extradata must not depend on the architecture or CPU endianness.
1375 * - encoding: Set/allocated/freed by libavcodec.
1376 * - decoding: Set/allocated/freed by user.
1377 */
1378 uint8_t *extradata;
1379 int extradata_size;
1380
1381 /**
1382 * This is the fundamental unit of time (in seconds) in terms
1383 * of which frame timestamps are represented. For fixed-fps content,
1384 * timebase should be 1/framerate and timestamp increments should be
1385 * identically 1.
1386 * - encoding: MUST be set by user.
1387 * - decoding: Set by libavcodec.
1388 */
1389 AVRational time_base;
1390
1391 /* video only */
1392 /**
1393 * picture width / height.
1394 * - encoding: MUST be set by user.
1395 * - decoding: Set by libavcodec.
1396 * Note: For compatibility it is possible to set this instead of
1397 * coded_width/height before decoding.
1398 */
1399 int width, height;
1400
1401 #define FF_ASPECT_EXTENDED 15
1402
1403 /**
1404 * the number of pictures in a group of pictures, or 0 for intra_only
1405 * - encoding: Set by user.
1406 * - decoding: unused
1407 */
1408 int gop_size;
1409
1410 /**
1411 * Pixel format, see PIX_FMT_xxx.
1412 * May be set by the demuxer if known from headers.
1413 * May be overriden by the decoder if it knows better.
1414 * - encoding: Set by user.
1415 * - decoding: Set by user if known, overridden by libavcodec if known
1416 */
1417 enum PixelFormat pix_fmt;
1418
1419 /**
1420 * If non NULL, 'draw_horiz_band' is called by the libavcodec
1421 * decoder to draw a horizontal band. It improves cache usage. Not
1422 * all codecs can do that. You must check the codec capabilities
1423 * beforehand.
1424 * When multithreading is used, it may be called from multiple threads
1425 * at the same time; threads might draw different parts of the same AVFrame,
1426 * or multiple AVFrames, and there is no guarantee that slices will be drawn
1427 * in order.
1428 * The function is also used by hardware acceleration APIs.
1429 * It is called at least once during frame decoding to pass
1430 * the data needed for hardware render.
1431 * In that mode instead of pixel data, AVFrame points to
1432 * a structure specific to the acceleration API. The application
1433 * reads the structure and can change some fields to indicate progress
1434 * or mark state.
1435 * - encoding: unused
1436 * - decoding: Set by user.
1437 * @param height the height of the slice
1438 * @param y the y position of the slice
1439 * @param type 1->top field, 2->bottom field, 3->frame
1440 * @param offset offset into the AVFrame.data from which the slice should be read
1441 */
1442 void (*draw_horiz_band)(struct AVCodecContext *s,
1443 const AVFrame *src, int offset[AV_NUM_DATA_POINTERS],
1444 int y, int type, int height);
1445
1446 /* audio only */
1447 int sample_rate; ///< samples per second
1448 int channels; ///< number of audio channels
1449
1450 /**
1451 * audio sample format
1452 * - encoding: Set by user.
1453 * - decoding: Set by libavcodec.
1454 */
1455 enum AVSampleFormat sample_fmt; ///< sample format
1456
1457 /* The following data should not be initialized. */
1458 /**
1459 * Samples per packet, initialized when calling 'init'.
1460 */
1461 int frame_size;
1462 int frame_number; ///< audio or video frame number
1463
1464 /**
1465 * Number of frames the decoded output will be delayed relative to
1466 * the encoded input.
1467 * - encoding: Set by libavcodec.
1468 * - decoding: unused
1469 */
1470 int delay;
1471
1472 /* - encoding parameters */
1473 float qcompress; ///< amount of qscale change between easy & hard scenes (0.0-1.0)
1474 float qblur; ///< amount of qscale smoothing over time (0.0-1.0)
1475
1476 /**
1477 * minimum quantizer
1478 * - encoding: Set by user.
1479 * - decoding: unused
1480 */
1481 int qmin;
1482
1483 /**
1484 * maximum quantizer
1485 * - encoding: Set by user.
1486 * - decoding: unused
1487 */
1488 int qmax;
1489
1490 /**
1491 * maximum quantizer difference between frames
1492 * - encoding: Set by user.
1493 * - decoding: unused
1494 */
1495 int max_qdiff;
1496
1497 /**
1498 * maximum number of B-frames between non-B-frames
1499 * Note: The output will be delayed by max_b_frames+1 relative to the input.
1500 * - encoding: Set by user.
1501 * - decoding: unused
1502 */
1503 int max_b_frames;
1504
1505 /**
1506 * qscale factor between IP and B-frames
1507 * If > 0 then the last P-frame quantizer will be used (q= lastp_q*factor+offset).
1508 * If < 0 then normal ratecontrol will be done (q= -normal_q*factor+offset).
1509 * - encoding: Set by user.
1510 * - decoding: unused
1511 */
1512 float b_quant_factor;
1513
1514 /** obsolete FIXME remove */
1515 int rc_strategy;
1516 #define FF_RC_STRATEGY_XVID 1
1517
1518 int b_frame_strategy;
1519
1520 struct AVCodec *codec;
1521
1522 void *priv_data;
1523
1524 int rtp_payload_size; /* The size of the RTP payload: the coder will */
1525 /* do its best to deliver a chunk with size */
1526 /* below rtp_payload_size, the chunk will start */
1527 /* with a start code on some codecs like H.263. */
1528 /* This doesn't take account of any particular */
1529 /* headers inside the transmitted RTP payload. */
1530
1531
1532 /* The RTP callback: This function is called */
1533 /* every time the encoder has a packet to send. */
1534 /* It depends on the encoder if the data starts */
1535 /* with a Start Code (it should). H.263 does. */
1536 /* mb_nb contains the number of macroblocks */
1537 /* encoded in the RTP payload. */
1538 void (*rtp_callback)(struct AVCodecContext *avctx, void *data, int size, int mb_nb);
1539
1540 /* statistics, used for 2-pass encoding */
1541 int mv_bits;
1542 int header_bits;
1543 int i_tex_bits;
1544 int p_tex_bits;
1545 int i_count;
1546 int p_count;
1547 int skip_count;
1548 int misc_bits;
1549
1550 /**
1551 * number of bits used for the previously encoded frame
1552 * - encoding: Set by libavcodec.
1553 * - decoding: unused
1554 */
1555 int frame_bits;
1556
1557 /**
1558 * Private data of the user, can be used to carry app specific stuff.
1559 * - encoding: Set by user.
1560 * - decoding: Set by user.
1561 */
1562 void *opaque;
1563
1564 char codec_name[32];
1565 enum AVMediaType codec_type; /* see AVMEDIA_TYPE_xxx */
1566 enum CodecID codec_id; /* see CODEC_ID_xxx */
1567
1568 /**
1569 * fourcc (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A').
1570 * This is used to work around some encoder bugs.
1571 * A demuxer should set this to what is stored in the field used to identify the codec.
1572 * If there are multiple such fields in a container then the demuxer should choose the one
1573 * which maximizes the information about the used codec.
1574 * If the codec tag field in a container is larger than 32 bits then the demuxer should
1575 * remap the longer ID to 32 bits with a table or other structure. Alternatively a new
1576 * extra_codec_tag + size could be added but for this a clear advantage must be demonstrated
1577 * first.
1578 * - encoding: Set by user, if not then the default based on codec_id will be used.
1579 * - decoding: Set by user, will be converted to uppercase by libavcodec during init.
1580 */
1581 unsigned int codec_tag;
1582
1583 /**
1584 * Work around bugs in encoders which sometimes cannot be detected automatically.
1585 * - encoding: Set by user
1586 * - decoding: Set by user
1587 */
1588 int workaround_bugs;
1589 #define FF_BUG_AUTODETECT 1 ///< autodetection
1590 #define FF_BUG_OLD_MSMPEG4 2
1591 #define FF_BUG_XVID_ILACE 4
1592 #define FF_BUG_UMP4 8
1593 #define FF_BUG_NO_PADDING 16
1594 #define FF_BUG_AMV 32
1595 #define FF_BUG_AC_VLC 0 ///< Will be removed, libavcodec can now handle these non-compliant files by default.
1596 #define FF_BUG_QPEL_CHROMA 64
1597 #define FF_BUG_STD_QPEL 128
1598 #define FF_BUG_QPEL_CHROMA2 256
1599 #define FF_BUG_DIRECT_BLOCKSIZE 512
1600 #define FF_BUG_EDGE 1024
1601 #define FF_BUG_HPEL_CHROMA 2048
1602 #define FF_BUG_DC_CLIP 4096
1603 #define FF_BUG_MS 8192 ///< Work around various bugs in Microsoft's broken decoders.
1604 #define FF_BUG_TRUNCATED 16384
1605 //#define FF_BUG_FAKE_SCALABILITY 16 //Autodetection should work 100%.
1606
1607 /**
1608 * luma single coefficient elimination threshold
1609 * - encoding: Set by user.
1610 * - decoding: unused
1611 */
1612 int luma_elim_threshold;
1613
1614 /**
1615 * chroma single coeff elimination threshold
1616 * - encoding: Set by user.
1617 * - decoding: unused
1618 */
1619 int chroma_elim_threshold;
1620
1621 /**
1622 * strictly follow the standard (MPEG4, ...).
1623 * - encoding: Set by user.
1624 * - decoding: Set by user.
1625 * Setting this to STRICT or higher means the encoder and decoder will
1626 * generally do stupid things, whereas setting it to unofficial or lower
1627 * will mean the encoder might produce output that is not supported by all
1628 * spec-compliant decoders. Decoders don't differentiate between normal,
1629 * unofficial and experimental (that is, they always try to decode things
1630 * when they can) unless they are explicitly asked to behave stupidly
1631 * (=strictly conform to the specs)
1632 */
1633 int strict_std_compliance;
1634 #define FF_COMPLIANCE_VERY_STRICT 2 ///< Strictly conform to an older more strict version of the spec or reference software.
1635 #define FF_COMPLIANCE_STRICT 1 ///< Strictly conform to all the things in the spec no matter what consequences.
1636 #define FF_COMPLIANCE_NORMAL 0
1637 #define FF_COMPLIANCE_UNOFFICIAL -1 ///< Allow unofficial extensions
1638 #define FF_COMPLIANCE_EXPERIMENTAL -2 ///< Allow nonstandardized experimental things.
1639
1640 /**
1641 * qscale offset between IP and B-frames
1642 * - encoding: Set by user.
1643 * - decoding: unused
1644 */
1645 float b_quant_offset;
1646
1647 #if FF_API_ER
1648 /**
1649 * Error recognition; higher values will detect more errors but may
1650 * misdetect some more or less valid parts as errors.
1651 * - encoding: unused
1652 * - decoding: Set by user.
1653 */
1654 attribute_deprecated int error_recognition;
1655 #define FF_ER_CAREFUL 1
1656 #define FF_ER_COMPLIANT 2
1657 #define FF_ER_AGGRESSIVE 3
1658 #define FF_ER_VERY_AGGRESSIVE 4
1659 #define FF_ER_EXPLODE 5
1660 #endif /* FF_API_ER */
1661
1662 /**
1663 * Called at the beginning of each frame to get a buffer for it.
1664 *
1665 * The function will set AVFrame.data[], AVFrame.linesize[].
1666 * AVFrame.extended_data[] must also be set, but it should be the same as
1667 * AVFrame.data[] except for planar audio with more channels than can fit
1668 * in AVFrame.data[]. In that case, AVFrame.data[] shall still contain as
1669 * many data pointers as it can hold.
1670 *
1671 * if CODEC_CAP_DR1 is not set then get_buffer() must call
1672 * avcodec_default_get_buffer() instead of providing buffers allocated by
1673 * some other means.
1674 *
1675 * AVFrame.data[] should be 32- or 16-byte-aligned unless the CPU doesn't
1676 * need it. avcodec_default_get_buffer() aligns the output buffer properly,
1677 * but if get_buffer() is overridden then alignment considerations should
1678 * be taken into account.
1679 *
1680 * @see avcodec_default_get_buffer()
1681 *
1682 * Video:
1683 *
1684 * If pic.reference is set then the frame will be read later by libavcodec.
1685 * avcodec_align_dimensions2() should be used to find the required width and
1686 * height, as they normally need to be rounded up to the next multiple of 16.
1687 *
1688 * If frame multithreading is used and thread_safe_callbacks is set,
1689 * it may be called from a different thread, but not from more than one at
1690 * once. Does not need to be reentrant.
1691 *
1692 * @see release_buffer(), reget_buffer()
1693 * @see avcodec_align_dimensions2()
1694 *
1695 * Audio:
1696 *
1697 * Decoders request a buffer of a particular size by setting
1698 * AVFrame.nb_samples prior to calling get_buffer(). The decoder may,
1699 * however, utilize only part of the buffer by setting AVFrame.nb_samples
1700 * to a smaller value in the output frame.
1701 *
1702 * Decoders cannot use the buffer after returning from
1703 * avcodec_decode_audio4(), so they will not call release_buffer(), as it
1704 * is assumed to be released immediately upon return.
1705 *
1706 * As a convenience, av_samples_get_buffer_size() and
1707 * av_samples_fill_arrays() in libavutil may be used by custom get_buffer()
1708 * functions to find the required data size and to fill data pointers and
1709 * linesize. In AVFrame.linesize, only linesize[0] may be set for audio
1710 * since all planes must be the same size.
1711 *
1712 * @see av_samples_get_buffer_size(), av_samples_fill_arrays()
1713 *
1714 * - encoding: unused
1715 * - decoding: Set by libavcodec, user can override.
1716 */
1717 int (*get_buffer)(struct AVCodecContext *c, AVFrame *pic);
1718
1719 /**
1720 * Called to release buffers which were allocated with get_buffer.
1721 * A released buffer can be reused in get_buffer().
1722 * pic.data[*] must be set to NULL.
1723 * May be called from a different thread if frame multithreading is used,
1724 * but not by more than one thread at once, so does not need to be reentrant.
1725 * - encoding: unused
1726 * - decoding: Set by libavcodec, user can override.
1727 */
1728 void (*release_buffer)(struct AVCodecContext *c, AVFrame *pic);
1729
1730 /**
1731 * Size of the frame reordering buffer in the decoder.
1732 * For MPEG-2 it is 1 IPB or 0 low delay IP.
1733 * - encoding: Set by libavcodec.
1734 * - decoding: Set by libavcodec.
1735 */
1736 int has_b_frames;
1737
1738 /**
1739 * number of bytes per packet if constant and known or 0
1740 * Used by some WAV based audio codecs.
1741 */
1742 int block_align;
1743
1744 #if FF_API_PARSE_FRAME
1745 /**
1746 * If true, only parsing is done. The frame data is returned.
1747 * Only MPEG audio decoders support this now.
1748 * - encoding: unused
1749 * - decoding: Set by user
1750 */
1751 attribute_deprecated int parse_only;
1752 #endif
1753
1754 /**
1755 * 0-> h263 quant 1-> mpeg quant
1756 * - encoding: Set by user.
1757 * - decoding: unused
1758 */
1759 int mpeg_quant;
1760
1761 /**
1762 * pass1 encoding statistics output buffer
1763 * - encoding: Set by libavcodec.
1764 * - decoding: unused
1765 */
1766 char *stats_out;
1767
1768 /**
1769 * pass2 encoding statistics input buffer
1770 * Concatenated stuff from stats_out of pass1 should be placed here.
1771 * - encoding: Allocated/set/freed by user.
1772 * - decoding: unused
1773 */
1774 char *stats_in;
1775
1776 /**
1777 * ratecontrol qmin qmax limiting method
1778 * 0-> clipping, 1-> use a nice continous function to limit qscale wthin qmin/qmax.
1779 * - encoding: Set by user.
1780 * - decoding: unused
1781 */
1782 float rc_qsquish;
1783
1784 float rc_qmod_amp;
1785 int rc_qmod_freq;
1786
1787 /**
1788 * ratecontrol override, see RcOverride
1789 * - encoding: Allocated/set/freed by user.
1790 * - decoding: unused
1791 */
1792 RcOverride *rc_override;
1793 int rc_override_count;
1794
1795 /**
1796 * rate control equation
1797 * - encoding: Set by user
1798 * - decoding: unused
1799 */
1800 const char *rc_eq;
1801
1802 /**
1803 * maximum bitrate
1804 * - encoding: Set by user.
1805 * - decoding: unused
1806 */
1807 int rc_max_rate;
1808
1809 /**
1810 * minimum bitrate
1811 * - encoding: Set by user.
1812 * - decoding: unused
1813 */
1814 int rc_min_rate;
1815
1816 /**
1817 * decoder bitstream buffer size
1818 * - encoding: Set by user.
1819 * - decoding: unused
1820 */
1821 int rc_buffer_size;
1822 float rc_buffer_aggressivity;
1823
1824 /**
1825 * qscale factor between P and I-frames
1826 * If > 0 then the last p frame quantizer will be used (q= lastp_q*factor+offset).
1827 * If < 0 then normal ratecontrol will be done (q= -normal_q*factor+offset).
1828 * - encoding: Set by user.
1829 * - decoding: unused
1830 */
1831 float i_quant_factor;
1832
1833 /**
1834 * qscale offset between P and I-frames
1835 * - encoding: Set by user.
1836 * - decoding: unused
1837 */
1838 float i_quant_offset;
1839
1840 /**
1841 * initial complexity for pass1 ratecontrol
1842 * - encoding: Set by user.
1843 * - decoding: unused
1844 */
1845 float rc_initial_cplx;
1846
1847 /**
1848 * DCT algorithm, see FF_DCT_* below
1849 * - encoding: Set by user.
1850 * - decoding: unused
1851 */
1852 int dct_algo;
1853 #define FF_DCT_AUTO 0
1854 #define FF_DCT_FASTINT 1
1855 #define FF_DCT_INT 2
1856 #define FF_DCT_MMX 3
1857 #define FF_DCT_MLIB 4
1858 #define FF_DCT_ALTIVEC 5
1859 #define FF_DCT_FAAN 6
1860
1861 /**
1862 * luminance masking (0-> disabled)
1863 * - encoding: Set by user.
1864 * - decoding: unused
1865 */
1866 float lumi_masking;
1867
1868 /**
1869 * temporary complexity masking (0-> disabled)
1870 * - encoding: Set by user.
1871 * - decoding: unused
1872 */
1873 float temporal_cplx_masking;
1874
1875 /**
1876 * spatial complexity masking (0-> disabled)
1877 * - encoding: Set by user.
1878 * - decoding: unused
1879 */
1880 float spatial_cplx_masking;
1881
1882 /**
1883 * p block masking (0-> disabled)
1884 * - encoding: Set by user.
1885 * - decoding: unused
1886 */
1887 float p_masking;
1888
1889 /**
1890 * darkness masking (0-> disabled)
1891 * - encoding: Set by user.
1892 * - decoding: unused
1893 */
1894 float dark_masking;
1895
1896 /**
1897 * IDCT algorithm, see FF_IDCT_* below.
1898 * - encoding: Set by user.
1899 * - decoding: Set by user.
1900 */
1901 int idct_algo;
1902 #define FF_IDCT_AUTO 0
1903 #define FF_IDCT_INT 1
1904 #define FF_IDCT_SIMPLE 2
1905 #define FF_IDCT_SIMPLEMMX 3
1906 #define FF_IDCT_LIBMPEG2MMX 4
1907 #define FF_IDCT_PS2 5
1908 #define FF_IDCT_MLIB 6
1909 #define FF_IDCT_ARM 7
1910 #define FF_IDCT_ALTIVEC 8
1911 #define FF_IDCT_SH4 9
1912 #define FF_IDCT_SIMPLEARM 10
1913 #define FF_IDCT_H264 11
1914 #define FF_IDCT_VP3 12
1915 #define FF_IDCT_IPP 13
1916 #define FF_IDCT_XVIDMMX 14
1917 #define FF_IDCT_CAVS 15
1918 #define FF_IDCT_SIMPLEARMV5TE 16
1919 #define FF_IDCT_SIMPLEARMV6 17
1920 #define FF_IDCT_SIMPLEVIS 18
1921 #define FF_IDCT_WMV2 19
1922 #define FF_IDCT_FAAN 20
1923 #define FF_IDCT_EA 21
1924 #define FF_IDCT_SIMPLENEON 22
1925 #define FF_IDCT_SIMPLEALPHA 23
1926 #define FF_IDCT_BINK 24
1927
1928 /**
1929 * slice count
1930 * - encoding: Set by libavcodec.
1931 * - decoding: Set by user (or 0).
1932 */
1933 int slice_count;
1934 /**
1935 * slice offsets in the frame in bytes
1936 * - encoding: Set/allocated by libavcodec.
1937 * - decoding: Set/allocated by user (or NULL).
1938 */
1939 int *slice_offset;
1940
1941 /**
1942 * error concealment flags
1943 * - encoding: unused
1944 * - decoding: Set by user.
1945 */
1946 int error_concealment;
1947 #define FF_EC_GUESS_MVS 1
1948 #define FF_EC_DEBLOCK 2
1949
1950 /**
1951 * dsp_mask could be add used to disable unwanted CPU features
1952 * CPU features (i.e. MMX, SSE. ...)
1953 *
1954 * With the FORCE flag you may instead enable given CPU features.
1955 * (Dangerous: Usable in case of misdetection, improper usage however will
1956 * result into program crash.)
1957 */
1958 unsigned dsp_mask;
1959
1960 /**
1961 * bits per sample/pixel from the demuxer (needed for huffyuv).
1962 * - encoding: Set by libavcodec.
1963 * - decoding: Set by user.
1964 */
1965 int bits_per_coded_sample;
1966
1967 /**
1968 * prediction method (needed for huffyuv)
1969 * - encoding: Set by user.
1970 * - decoding: unused
1971 */
1972 int prediction_method;
1973 #define FF_PRED_LEFT 0
1974 #define FF_PRED_PLANE 1
1975 #define FF_PRED_MEDIAN 2
1976
1977 /**
1978 * sample aspect ratio (0 if unknown)
1979 * That is the width of a pixel divided by the height of the pixel.
1980 * Numerator and denominator must be relatively prime and smaller than 256 for some video standards.
1981 * - encoding: Set by user.
1982 * - decoding: Set by libavcodec.
1983 */
1984 AVRational sample_aspect_ratio;
1985
1986 /**
1987 * the picture in the bitstream
1988 * - encoding: Set by libavcodec.
1989 * - decoding: Set by libavcodec.
1990 */
1991 AVFrame *coded_frame;
1992
1993 /**
1994 * debug
1995 * - encoding: Set by user.
1996 * - decoding: Set by user.
1997 */
1998 int debug;
1999 #define FF_DEBUG_PICT_INFO 1
2000 #define FF_DEBUG_RC 2
2001 #define FF_DEBUG_BITSTREAM 4
2002 #define FF_DEBUG_MB_TYPE 8
2003 #define FF_DEBUG_QP 16
2004 #define FF_DEBUG_MV 32
2005 #define FF_DEBUG_DCT_COEFF 0x00000040
2006 #define FF_DEBUG_SKIP 0x00000080
2007 #define FF_DEBUG_STARTCODE 0x00000100
2008 #define FF_DEBUG_PTS 0x00000200
2009 #define FF_DEBUG_ER 0x00000400
2010 #define FF_DEBUG_MMCO 0x00000800
2011 #define FF_DEBUG_BUGS 0x00001000
2012 #define FF_DEBUG_VIS_QP 0x00002000
2013 #define FF_DEBUG_VIS_MB_TYPE 0x00004000
2014 #define FF_DEBUG_BUFFERS 0x00008000
2015 #define FF_DEBUG_THREADS 0x00010000
2016
2017 /**
2018 * debug
2019 * - encoding: Set by user.
2020 * - decoding: Set by user.
2021 */
2022 int debug_mv;
2023 #define FF_DEBUG_VIS_MV_P_FOR 0x00000001 //visualize forward predicted MVs of P frames
2024 #define FF_DEBUG_VIS_MV_B_FOR 0x00000002 //visualize forward predicted MVs of B frames
2025 #define FF_DEBUG_VIS_MV_B_BACK 0x00000004 //visualize backward predicted MVs of B frames
2026
2027 /**
2028 * error
2029 * - encoding: Set by libavcodec if flags&CODEC_FLAG_PSNR.
2030 * - decoding: unused
2031 */
2032 uint64_t error[AV_NUM_DATA_POINTERS];
2033
2034 /**
2035 * motion estimation comparison function
2036 * - encoding: Set by user.
2037 * - decoding: unused
2038 */
2039 int me_cmp;
2040 /**
2041 * subpixel motion estimation comparison function
2042 * - encoding: Set by user.
2043 * - decoding: unused
2044 */
2045 int me_sub_cmp;
2046 /**
2047 * macroblock comparison function (not supported yet)
2048 * - encoding: Set by user.
2049 * - decoding: unused
2050 */
2051 int mb_cmp;
2052 /**
2053 * interlaced DCT comparison function
2054 * - encoding: Set by user.
2055 * - decoding: unused
2056 */
2057 int ildct_cmp;
2058 #define FF_CMP_SAD 0
2059 #define FF_CMP_SSE 1
2060 #define FF_CMP_SATD 2
2061 #define FF_CMP_DCT 3
2062 #define FF_CMP_PSNR 4
2063 #define FF_CMP_BIT 5
2064 #define FF_CMP_RD 6
2065 #define FF_CMP_ZERO 7
2066 #define FF_CMP_VSAD 8
2067 #define FF_CMP_VSSE 9
2068 #define FF_CMP_NSSE 10
2069 #define FF_CMP_W53 11
2070 #define FF_CMP_W97 12
2071 #define FF_CMP_DCTMAX 13
2072 #define FF_CMP_DCT264 14
2073 #define FF_CMP_CHROMA 256
2074
2075 /**
2076 * ME diamond size & shape
2077 * - encoding: Set by user.
2078 * - decoding: unused
2079 */
2080 int dia_size;
2081
2082 /**
2083 * amount of previous MV predictors (2a+1 x 2a+1 square)
2084 * - encoding: Set by user.
2085 * - decoding: unused
2086 */
2087 int last_predictor_count;
2088
2089 /**
2090 * prepass for motion estimation
2091 * - encoding: Set by user.
2092 * - decoding: unused
2093 */
2094 int pre_me;
2095
2096 /**
2097 * motion estimation prepass comparison function
2098 * - encoding: Set by user.
2099 * - decoding: unused
2100 */
2101 int me_pre_cmp;
2102
2103 /**
2104 * ME prepass diamond size & shape
2105 * - encoding: Set by user.
2106 * - decoding: unused
2107 */
2108 int pre_dia_size;
2109
2110 /**
2111 * subpel ME quality
2112 * - encoding: Set by user.
2113 * - decoding: unused
2114 */
2115 int me_subpel_quality;
2116
2117 /**
2118 * callback to negotiate the pixelFormat
2119 * @param fmt is the list of formats which are supported by the codec,
2120 * it is terminated by -1 as 0 is a valid format, the formats are ordered by quality.
2121 * The first is always the native one.
2122 * @return the chosen format
2123 * - encoding: unused
2124 * - decoding: Set by user, if not set the native format will be chosen.
2125 */
2126 enum PixelFormat (*get_format)(struct AVCodecContext *s, const enum PixelFormat * fmt);
2127
2128 /**
2129 * DTG active format information (additional aspect ratio
2130 * information only used in DVB MPEG-2 transport streams)
2131 * 0 if not set.
2132 *
2133 * - encoding: unused
2134 * - decoding: Set by decoder.
2135 */
2136 int dtg_active_format;
2137 #define FF_DTG_AFD_SAME 8
2138 #define FF_DTG_AFD_4_3 9
2139 #define FF_DTG_AFD_16_9 10
2140 #define FF_DTG_AFD_14_9 11
2141 #define FF_DTG_AFD_4_3_SP_14_9 13
2142 #define FF_DTG_AFD_16_9_SP_14_9 14
2143 #define FF_DTG_AFD_SP_4_3 15
2144
2145 /**
2146 * maximum motion estimation search range in subpel units
2147 * If 0 then no limit.
2148 *
2149 * - encoding: Set by user.
2150 * - decoding: unused
2151 */
2152 int me_range;
2153
2154 /**
2155 * intra quantizer bias
2156 * - encoding: Set by user.
2157 * - decoding: unused
2158 */
2159 int intra_quant_bias;
2160 #define FF_DEFAULT_QUANT_BIAS 999999
2161
2162 /**
2163 * inter quantizer bias
2164 * - encoding: Set by user.
2165 * - decoding: unused
2166 */
2167 int inter_quant_bias;
2168
2169 /**
2170 * color table ID
2171 * - encoding: unused
2172 * - decoding: Which clrtable should be used for 8bit RGB images.
2173 * Tables have to be stored somewhere. FIXME
2174 */
2175 int color_table_id;
2176
2177 #if FF_API_INTERNAL_CONTEXT
2178 /**
2179 * internal_buffer count
2180 * Don't touch, used by libavcodec default_get_buffer().
2181 * @deprecated this field was moved to an internal context
2182 */
2183 attribute_deprecated int internal_buffer_count;
2184
2185 /**
2186 * internal_buffers
2187 * Don't touch, used by libavcodec default_get_buffer().
2188 * @deprecated this field was moved to an internal context
2189 */
2190 attribute_deprecated void *internal_buffer;
2191 #endif
2192
2193 /**
2194 * Global quality for codecs which cannot change it per frame.
2195 * This should be proportional to MPEG-1/2/4 qscale.
2196 * - encoding: Set by user.
2197 * - decoding: unused
2198 */
2199 int global_quality;
2200
2201 #define FF_CODER_TYPE_VLC 0
2202 #define FF_CODER_TYPE_AC 1
2203 #define FF_CODER_TYPE_RAW 2
2204 #define FF_CODER_TYPE_RLE 3
2205 #define FF_CODER_TYPE_DEFLATE 4
2206 /**
2207 * coder type
2208 * - encoding: Set by user.
2209 * - decoding: unused
2210 */
2211 int coder_type;
2212
2213 /**
2214 * context model
2215 * - encoding: Set by user.
2216 * - decoding: unused
2217 */
2218 int context_model;
2219 #if 0
2220 /**
2221 *
2222 * - encoding: unused
2223 * - decoding: Set by user.
2224 */
2225 uint8_t * (*realloc)(struct AVCodecContext *s, uint8_t *buf, int buf_size);
2226 #endif
2227
2228 /**
2229 * slice flags
2230 * - encoding: unused
2231 * - decoding: Set by user.
2232 */
2233 int slice_flags;
2234 #define SLICE_FLAG_CODED_ORDER 0x0001 ///< draw_horiz_band() is called in coded order instead of display
2235 #define SLICE_FLAG_ALLOW_FIELD 0x0002 ///< allow draw_horiz_band() with field slices (MPEG2 field pics)
2236 #define SLICE_FLAG_ALLOW_PLANE 0x0004 ///< allow draw_horiz_band() with 1 component at a time (SVQ1)
2237
2238 /**
2239 * XVideo Motion Acceleration
2240 * - encoding: forbidden
2241 * - decoding: set by decoder
2242 */
2243 int xvmc_acceleration;
2244
2245 /**
2246 * macroblock decision mode
2247 * - encoding: Set by user.
2248 * - decoding: unused
2249 */
2250 int mb_decision;
2251 #define FF_MB_DECISION_SIMPLE 0 ///< uses mb_cmp
2252 #define FF_MB_DECISION_BITS 1 ///< chooses the one which needs the fewest bits
2253 #define FF_MB_DECISION_RD 2 ///< rate distortion
2254
2255 /**
2256 * custom intra quantization matrix
2257 * - encoding: Set by user, can be NULL.
2258 * - decoding: Set by libavcodec.
2259 */
2260 uint16_t *intra_matrix;
2261
2262 /**
2263 * custom inter quantization matrix
2264 * - encoding: Set by user, can be NULL.
2265 * - decoding: Set by libavcodec.
2266 */
2267 uint16_t *inter_matrix;
2268
2269 /**
2270 * fourcc from the AVI stream header (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A').
2271 * This is used to work around some encoder bugs.
2272 * - encoding: unused
2273 * - decoding: Set by user, will be converted to uppercase by libavcodec during init.
2274 */
2275 unsigned int stream_codec_tag;
2276
2277 /**
2278 * scene change detection threshold
2279 * 0 is default, larger means fewer detected scene changes.
2280 * - encoding: Set by user.
2281 * - decoding: unused
2282 */
2283 int scenechange_threshold;
2284
2285 /**
2286 * minimum Lagrange multipler
2287 * - encoding: Set by user.
2288 * - decoding: unused
2289 */
2290 int lmin;
2291
2292 /**
2293 * maximum Lagrange multipler
2294 * - encoding: Set by user.
2295 * - decoding: unused
2296 */
2297 int lmax;
2298
2299 #if FF_API_PALETTE_CONTROL
2300 /**
2301 * palette control structure
2302 * - encoding: ??? (no palette-enabled encoder yet)
2303 * - decoding: Set by user.
2304 */
2305 struct AVPaletteControl *palctrl;
2306 #endif
2307
2308 /**
2309 * noise reduction strength
2310 * - encoding: Set by user.
2311 * - decoding: unused
2312 */
2313 int noise_reduction;
2314
2315 /**
2316 * Called at the beginning of a frame to get cr buffer for it.
2317 * Buffer type (size, hints) must be the same. libavcodec won't check it.
2318 * libavcodec will pass previous buffer in pic, function should return
2319 * same buffer or new buffer with old frame "painted" into it.
2320 * If pic.data[0] == NULL must behave like get_buffer().
2321 * if CODEC_CAP_DR1 is not set then reget_buffer() must call
2322 * avcodec_default_reget_buffer() instead of providing buffers allocated by
2323 * some other means.
2324 * - encoding: unused
2325 * - decoding: Set by libavcodec, user can override.
2326 */
2327 int (*reget_buffer)(struct AVCodecContext *c, AVFrame *pic);
2328
2329 /**
2330 * Number of bits which should be loaded into the rc buffer before decoding starts.
2331 * - encoding: Set by user.
2332 * - decoding: unused
2333 */
2334 int rc_initial_buffer_occupancy;
2335
2336 /**
2337 *
2338 * - encoding: Set by user.
2339 * - decoding: unused
2340 */
2341 int inter_threshold;
2342
2343 /**
2344 * CODEC_FLAG2_*
2345 * - encoding: Set by user.
2346 * - decoding: Set by user.
2347 */
2348 int flags2;
2349
2350 /**
2351 * Simulates errors in the bitstream to test error concealment.
2352 * - encoding: Set by user.
2353 * - decoding: unused
2354 */
2355 int error_rate;
2356
2357 #if FF_API_ANTIALIAS_ALGO
2358 /**
2359 * MP3 antialias algorithm, see FF_AA_* below.
2360 * - encoding: unused
2361 * - decoding: Set by user.
2362 */
2363 attribute_deprecated int antialias_algo;
2364 #define FF_AA_AUTO 0
2365 #define FF_AA_FASTINT 1 //not implemented yet
2366 #define FF_AA_INT 2
2367 #define FF_AA_FLOAT 3
2368 #endif
2369
2370 /**
2371 * quantizer noise shaping
2372 * - encoding: Set by user.
2373 * - decoding: unused
2374 */
2375 int quantizer_noise_shaping;
2376
2377 /**
2378 * thread count
2379 * is used to decide how many independent tasks should be passed to execute()
2380 * - encoding: Set by user.
2381 * - decoding: Set by user.
2382 */
2383 int thread_count;
2384
2385 /**
2386 * The codec may call this to execute several independent things.
2387 * It will return only after finishing all tasks.
2388 * The user may replace this with some multithreaded implementation,
2389 * the default implementation will execute the parts serially.
2390 * @param count the number of things to execute
2391 * - encoding: Set by libavcodec, user can override.
2392 * - decoding: Set by libavcodec, user can override.
2393 */
2394 int (*execute)(struct AVCodecContext *c, int (*func)(struct AVCodecContext *c2, void *arg), void *arg2, int *ret, int count, int size);
2395
2396 /**
2397 * thread opaque
2398 * Can be used by execute() to store some per AVCodecContext stuff.
2399 * - encoding: set by execute()
2400 * - decoding: set by execute()
2401 */
2402 void *thread_opaque;
2403
2404 /**
2405 * Motion estimation threshold below which no motion estimation is
2406 * performed, but instead the user specified motion vectors are used.
2407 *
2408 * - encoding: Set by user.
2409 * - decoding: unused
2410 */
2411 int me_threshold;
2412
2413 /**
2414 * Macroblock threshold below which the user specified macroblock types will be used.
2415 * - encoding: Set by user.
2416 * - decoding: unused
2417 */
2418 int mb_threshold;
2419
2420 /**
2421 * precision of the intra DC coefficient - 8
2422 * - encoding: Set by user.
2423 * - decoding: unused
2424 */
2425 int intra_dc_precision;
2426
2427 /**
2428 * noise vs. sse weight for the nsse comparsion function
2429 * - encoding: Set by user.
2430 * - decoding: unused
2431 */
2432 int nsse_weight;
2433
2434 /**
2435 * Number of macroblock rows at the top which are skipped.
2436 * - encoding: unused
2437 * - decoding: Set by user.
2438 */
2439 int skip_top;
2440
2441 /**
2442 * Number of macroblock rows at the bottom which are skipped.
2443 * - encoding: unused
2444 * - decoding: Set by user.
2445 */
2446 int skip_bottom;
2447
2448 /**
2449 * profile
2450 * - encoding: Set by user.
2451 * - decoding: Set by libavcodec.
2452 */
2453 int profile;
2454 #define FF_PROFILE_UNKNOWN -99
2455 #define FF_PROFILE_RESERVED -100
2456
2457 #define FF_PROFILE_AAC_MAIN 0
2458 #define FF_PROFILE_AAC_LOW 1
2459 #define FF_PROFILE_AAC_SSR 2
2460 #define FF_PROFILE_AAC_LTP 3
2461
2462 #define FF_PROFILE_DTS 20
2463 #define FF_PROFILE_DTS_ES 30
2464 #define FF_PROFILE_DTS_96_24 40
2465 #define FF_PROFILE_DTS_HD_HRA 50
2466 #define FF_PROFILE_DTS_HD_MA 60
2467
2468 #define FF_PROFILE_MPEG2_422 0
2469 #define FF_PROFILE_MPEG2_HIGH 1
2470 #define FF_PROFILE_MPEG2_SS 2
2471 #define FF_PROFILE_MPEG2_SNR_SCALABLE 3
2472 #define FF_PROFILE_MPEG2_MAIN 4
2473 #define FF_PROFILE_MPEG2_SIMPLE 5
2474
2475 #define FF_PROFILE_H264_CONSTRAINED (1<<9) // 8+1; constraint_set1_flag
2476 #define FF_PROFILE_H264_INTRA (1<<11) // 8+3; constraint_set3_flag
2477
2478 #define FF_PROFILE_H264_BASELINE 66
2479 #define FF_PROFILE_H264_CONSTRAINED_BASELINE (66|FF_PROFILE_H264_CONSTRAINED)
2480 #define FF_PROFILE_H264_MAIN 77
2481 #define FF_PROFILE_H264_EXTENDED 88
2482 #define FF_PROFILE_H264_HIGH 100
2483 #define FF_PROFILE_H264_HIGH_10 110
2484 #define FF_PROFILE_H264_HIGH_10_INTRA (110|FF_PROFILE_H264_INTRA)
2485 #define FF_PROFILE_H264_HIGH_422 122
2486 #define FF_PROFILE_H264_HIGH_422_INTRA (122|FF_PROFILE_H264_INTRA)
2487 #define FF_PROFILE_H264_HIGH_444 144
2488 #define FF_PROFILE_H264_HIGH_444_PREDICTIVE 244
2489 #define FF_PROFILE_H264_HIGH_444_INTRA (244|FF_PROFILE_H264_INTRA)
2490 #define FF_PROFILE_H264_CAVLC_444 44
2491
2492 #define FF_PROFILE_VC1_SIMPLE 0
2493 #define FF_PROFILE_VC1_MAIN 1
2494 #define FF_PROFILE_VC1_COMPLEX 2
2495 #define FF_PROFILE_VC1_ADVANCED 3
2496
2497 #define FF_PROFILE_MPEG4_SIMPLE 0
2498 #define FF_PROFILE_MPEG4_SIMPLE_SCALABLE 1
2499 #define FF_PROFILE_MPEG4_CORE 2
2500 #define FF_PROFILE_MPEG4_MAIN 3
2501 #define FF_PROFILE_MPEG4_N_BIT 4
2502 #define FF_PROFILE_MPEG4_SCALABLE_TEXTURE 5
2503 #define FF_PROFILE_MPEG4_SIMPLE_FACE_ANIMATION 6
2504 #define FF_PROFILE_MPEG4_BASIC_ANIMATED_TEXTURE 7
2505 #define FF_PROFILE_MPEG4_HYBRID 8
2506 #define FF_PROFILE_MPEG4_ADVANCED_REAL_TIME 9
2507 #define FF_PROFILE_MPEG4_CORE_SCALABLE 10
2508 #define FF_PROFILE_MPEG4_ADVANCED_CODING 11
2509 #define FF_PROFILE_MPEG4_ADVANCED_CORE 12
2510 #define FF_PROFILE_MPEG4_ADVANCED_SCALABLE_TEXTURE 13
2511 #define FF_PROFILE_MPEG4_SIMPLE_STUDIO 14
2512 #define FF_PROFILE_MPEG4_ADVANCED_SIMPLE 15
2513
2514 /**
2515 * level
2516 * - encoding: Set by user.
2517 * - decoding: Set by libavcodec.
2518 */
2519 int level;
2520 #define FF_LEVEL_UNKNOWN -99
2521
2522 /**
2523 * low resolution decoding, 1-> 1/2 size, 2->1/4 size
2524 * - encoding: unused
2525 * - decoding: Set by user.
2526 */
2527 int lowres;
2528
2529 /**
2530 * Bitstream width / height, may be different from width/height if lowres enabled.
2531 * - encoding: unused
2532 * - decoding: Set by user before init if known. Codec should override / dynamically change if needed.
2533 */
2534 int coded_width, coded_height;
2535
2536 /**
2537 * frame skip threshold
2538 * - encoding: Set by user.
2539 * - decoding: unused
2540 */
2541 int frame_skip_threshold;
2542
2543 /**
2544 * frame skip factor
2545 * - encoding: Set by user.
2546 * - decoding: unused
2547 */
2548 int frame_skip_factor;
2549
2550 /**
2551 * frame skip exponent
2552 * - encoding: Set by user.
2553 * - decoding: unused
2554 */
2555 int frame_skip_exp;
2556
2557 /**
2558 * frame skip comparison function
2559 * - encoding: Set by user.
2560 * - decoding: unused
2561 */
2562 int frame_skip_cmp;
2563
2564 /**
2565 * Border processing masking, raises the quantizer for mbs on the borders
2566 * of the picture.
2567 * - encoding: Set by user.
2568 * - decoding: unused
2569 */
2570 float border_masking;
2571
2572 /**
2573 * minimum MB lagrange multipler
2574 * - encoding: Set by user.
2575 * - decoding: unused
2576 */
2577 int mb_lmin;
2578
2579 /**
2580 * maximum MB lagrange multipler
2581 * - encoding: Set by user.
2582 * - decoding: unused
2583 */
2584 int mb_lmax;
2585
2586 /**
2587 *
2588 * - encoding: Set by user.
2589 * - decoding: unused
2590 */
2591 int me_penalty_compensation;
2592
2593 /**
2594 *
2595 * - encoding: unused
2596 * - decoding: Set by user.
2597 */
2598 enum AVDiscard skip_loop_filter;
2599
2600 /**
2601 *
2602 * - encoding: unused
2603 * - decoding: Set by user.
2604 */
2605 enum AVDiscard skip_idct;
2606
2607 /**
2608 *
2609 * - encoding: unused
2610 * - decoding: Set by user.
2611 */
2612 enum AVDiscard skip_frame;
2613
2614 /**
2615 *
2616 * - encoding: Set by user.
2617 * - decoding: unused
2618 */
2619 int bidir_refine;
2620
2621 /**
2622 *
2623 * - encoding: Set by user.
2624 * - decoding: unused
2625 */
2626 int brd_scale;
2627
2628 #if FF_API_X264_GLOBAL_OPTS
2629 /**
2630 * constant rate factor - quality-based VBR - values ~correspond to qps
2631 * - encoding: Set by user.
2632 * - decoding: unused
2633 * @deprecated use 'crf' libx264 private option
2634 */
2635 attribute_deprecated float crf;
2636
2637 /**
2638 * constant quantization parameter rate control method
2639 * - encoding: Set by user.
2640 * - decoding: unused
2641 * @deprecated use 'cqp' libx264 private option
2642 */
2643 attribute_deprecated int cqp;
2644 #endif
2645
2646 /**
2647 * minimum GOP size
2648 * - encoding: Set by user.
2649 * - decoding: unused
2650 */
2651 int keyint_min;
2652
2653 /**
2654 * number of reference frames
2655 * - encoding: Set by user.
2656 * - decoding: Set by lavc.
2657 */
2658 int refs;
2659
2660 /**
2661 * chroma qp offset from luma
2662 * - encoding: Set by user.
2663 * - decoding: unused
2664 */
2665 int chromaoffset;
2666
2667 #if FF_API_X264_GLOBAL_OPTS
2668 /**
2669 * Influence how often B-frames are used.
2670 * - encoding: Set by user.
2671 * - decoding: unused
2672 */
2673 attribute_deprecated int bframebias;
2674 #endif
2675
2676 /**
2677 * trellis RD quantization
2678 * - encoding: Set by user.
2679 * - decoding: unused
2680 */
2681 int trellis;
2682
2683 #if FF_API_X264_GLOBAL_OPTS
2684 /**
2685 * Reduce fluctuations in qp (before curve compression).
2686 * - encoding: Set by user.
2687 * - decoding: unused
2688 */
2689 attribute_deprecated float complexityblur;
2690
2691 /**
2692 * in-loop deblocking filter alphac0 parameter
2693 * alpha is in the range -6...6
2694 * - encoding: Set by user.
2695 * - decoding: unused
2696 */
2697 attribute_deprecated int deblockalpha;
2698
2699 /**
2700 * in-loop deblocking filter beta parameter
2701 * beta is in the range -6...6
2702 * - encoding: Set by user.
2703 * - decoding: unused
2704 */
2705 attribute_deprecated int deblockbeta;
2706
2707 /**
2708 * macroblock subpartition sizes to consider - p8x8, p4x4, b8x8, i8x8, i4x4
2709 * - encoding: Set by user.
2710 * - decoding: unused
2711 */
2712 attribute_deprecated int partitions;
2713 #define X264_PART_I4X4 0x001 /* Analyze i4x4 */
2714 #define X264_PART_I8X8 0x002 /* Analyze i8x8 (requires 8x8 transform) */
2715 #define X264_PART_P8X8 0x010 /* Analyze p16x8, p8x16 and p8x8 */
2716 #define X264_PART_P4X4 0x020 /* Analyze p8x4, p4x8, p4x4 */
2717 #define X264_PART_B8X8 0x100 /* Analyze b16x8, b8x16 and b8x8 */
2718
2719 /**
2720 * direct MV prediction mode - 0 (none), 1 (spatial), 2 (temporal), 3 (auto)
2721 * - encoding: Set by user.
2722 * - decoding: unused
2723 */
2724 attribute_deprecated int directpred;
2725 #endif
2726
2727 /**
2728 * Audio cutoff bandwidth (0 means "automatic")
2729 * - encoding: Set by user.
2730 * - decoding: unused
2731 */
2732 int cutoff;
2733
2734 /**
2735 * Multiplied by qscale for each frame and added to scene_change_score.
2736 * - encoding: Set by user.
2737 * - decoding: unused
2738 */
2739 int scenechange_factor;
2740
2741 /**
2742 *
2743 * Note: Value depends upon the compare function used for fullpel ME.
2744 * - encoding: Set by user.
2745 * - decoding: unused
2746 */
2747 int mv0_threshold;
2748
2749 /**
2750 * Adjust sensitivity of b_frame_strategy 1.
2751 * - encoding: Set by user.
2752 * - decoding: unused
2753 */
2754 int b_sensitivity;
2755
2756 /**
2757 * - encoding: Set by user.
2758 * - decoding: unused
2759 */
2760 int compression_level;
2761 #define FF_COMPRESSION_DEFAULT -1
2762
2763 /**
2764 * - encoding: Set by user.
2765 * - decoding: unused
2766 */
2767 int min_prediction_order;
2768
2769 /**
2770 * - encoding: Set by user.
2771 * - decoding: unused
2772 */
2773 int max_prediction_order;
2774
2775 #if FF_API_FLAC_GLOBAL_OPTS
2776 /**
2777 * @name FLAC options
2778 * @deprecated Use FLAC encoder private options instead.
2779 * @{
2780 */
2781
2782 /**
2783 * LPC coefficient precision - used by FLAC encoder
2784 * - encoding: Set by user.
2785 * - decoding: unused
2786 */
2787 attribute_deprecated int lpc_coeff_precision;
2788
2789 /**
2790 * search method for selecting prediction order
2791 * - encoding: Set by user.
2792 * - decoding: unused
2793 */
2794 attribute_deprecated int prediction_order_method;
2795
2796 /**
2797 * - encoding: Set by user.
2798 * - decoding: unused
2799 */
2800 attribute_deprecated int min_partition_order;
2801
2802 /**
2803 * - encoding: Set by user.
2804 * - decoding: unused
2805 */
2806 attribute_deprecated int max_partition_order;
2807 /**
2808 * @}
2809 */
2810 #endif
2811
2812 /**
2813 * GOP timecode frame start number, in non drop frame format
2814 * - encoding: Set by user.
2815 * - decoding: unused
2816 */
2817 int64_t timecode_frame_start;
2818
2819 #if FF_API_REQUEST_CHANNELS
2820 /**
2821 * Decoder should decode to this many channels if it can (0 for default)
2822 * - encoding: unused
2823 * - decoding: Set by user.
2824 * @deprecated Deprecated in favor of request_channel_layout.
2825 */
2826 int request_channels;
2827 #endif
2828
2829 #if FF_API_DRC_SCALE
2830 /**
2831 * Percentage of dynamic range compression to be applied by the decoder.
2832 * The default value is 1.0, corresponding to full compression.
2833 * - encoding: unused
2834 * - decoding: Set by user.
2835 * @deprecated use AC3 decoder private option instead.
2836 */
2837 attribute_deprecated float drc_scale;
2838 #endif
2839
2840 /**
2841 * opaque 64bit number (generally a PTS) that will be reordered and
2842 * output in AVFrame.reordered_opaque
2843 * @deprecated in favor of pkt_pts
2844 * - encoding: unused
2845 * - decoding: Set by user.
2846 */
2847 int64_t reordered_opaque;
2848
2849 /**
2850 * Bits per sample/pixel of internal libavcodec pixel/sample format.
2851 * - encoding: set by user.
2852 * - decoding: set by libavcodec.
2853 */
2854 int bits_per_raw_sample;
2855
2856 /**
2857 * Audio channel layout.
2858 * - encoding: set by user.
2859 * - decoding: set by libavcodec.
2860 */
2861 uint64_t channel_layout;
2862
2863 /**
2864 * Request decoder to use this channel layout if it can (0 for default)
2865 * - encoding: unused
2866 * - decoding: Set by user.
2867 */
2868 uint64_t request_channel_layout;
2869
2870 /**
2871 * Ratecontrol attempt to use, at maximum, <value> of what can be used without an underflow.
2872 * - encoding: Set by user.
2873 * - decoding: unused.
2874 */
2875 float rc_max_available_vbv_use;
2876
2877 /**
2878 * Ratecontrol attempt to use, at least, <value> times the amount needed to prevent a vbv overflow.
2879 * - encoding: Set by user.
2880 * - decoding: unused.
2881 */
2882 float rc_min_vbv_overflow_use;
2883
2884 /**
2885 * Hardware accelerator in use
2886 * - encoding: unused.
2887 * - decoding: Set by libavcodec
2888 */
2889 struct AVHWAccel *hwaccel;
2890
2891 /**
2892 * For some codecs, the time base is closer to the field rate than the frame rate.
2893 * Most notably, H.264 and MPEG-2 specify time_base as half of frame duration
2894 * if no telecine is used ...
2895 *
2896 * Set to time_base ticks per frame. Default 1, e.g., H.264/MPEG-2 set it to 2.
2897 */
2898 int ticks_per_frame;
2899
2900 /**
2901 * Hardware accelerator context.
2902 * For some hardware accelerators, a global context needs to be
2903 * provided by the user. In that case, this holds display-dependent
2904 * data Libav cannot instantiate itself. Please refer to the
2905 * Libav HW accelerator documentation to know how to fill this
2906 * is. e.g. for VA API, this is a struct vaapi_context.
2907 * - encoding: unused
2908 * - decoding: Set by user
2909 */
2910 void *hwaccel_context;
2911
2912 /**
2913 * Chromaticity coordinates of the source primaries.
2914 * - encoding: Set by user
2915 * - decoding: Set by libavcodec
2916 */
2917 enum AVColorPrimaries color_primaries;
2918
2919 /**
2920 * Color Transfer Characteristic.
2921 * - encoding: Set by user
2922 * - decoding: Set by libavcodec
2923 */
2924 enum AVColorTransferCharacteristic color_trc;
2925
2926 /**
2927 * YUV colorspace type.
2928 * - encoding: Set by user
2929 * - decoding: Set by libavcodec
2930 */
2931 enum AVColorSpace colorspace;
2932
2933 /**
2934 * MPEG vs JPEG YUV range.
2935 * - encoding: Set by user
2936 * - decoding: Set by libavcodec
2937 */
2938 enum AVColorRange color_range;
2939
2940 /**
2941 * This defines the location of chroma samples.
2942 * - encoding: Set by user
2943 * - decoding: Set by libavcodec
2944 */
2945 enum AVChromaLocation chroma_sample_location;
2946
2947 /**
2948 * The codec may call this to execute several independent things.
2949 * It will return only after finishing all tasks.
2950 * The user may replace this with some multithreaded implementation,
2951 * the default implementation will execute the parts serially.
2952 * Also see avcodec_thread_init and e.g. the --enable-pthread configure option.
2953 * @param c context passed also to func
2954 * @param count the number of things to execute
2955 * @param arg2 argument passed unchanged to func
2956 * @param ret return values of executed functions, must have space for "count" values. May be NULL.
2957 * @param func function that will be called count times, with jobnr from 0 to count-1.
2958 * threadnr will be in the range 0 to c->thread_count-1 < MAX_THREADS and so that no
2959 * two instances of func executing at the same time will have the same threadnr.
2960 * @return always 0 currently, but code should handle a future improvement where when any call to func
2961 * returns < 0 no further calls to func may be done and < 0 is returned.
2962 * - encoding: Set by libavcodec, user can override.
2963 * - decoding: Set by libavcodec, user can override.
2964 */
2965 int (*execute2)(struct AVCodecContext *c, int (*func)(struct AVCodecContext *c2, void *arg, int jobnr, int threadnr), void *arg2, int *ret, int count);
2966
2967 #if FF_API_X264_GLOBAL_OPTS
2968 /**
2969 * explicit P-frame weighted prediction analysis method
2970 * 0: off
2971 * 1: fast blind weighting (one reference duplicate with -1 offset)
2972 * 2: smart weighting (full fade detection analysis)
2973 * - encoding: Set by user.
2974 * - decoding: unused
2975 */
2976 attribute_deprecated int weighted_p_pred;
2977
2978 /**
2979 * AQ mode
2980 * 0: Disabled
2981 * 1: Variance AQ (complexity mask)
2982 * 2: Auto-variance AQ (experimental)
2983 * - encoding: Set by user
2984 * - decoding: unused
2985 */
2986 attribute_deprecated int aq_mode;
2987
2988 /**
2989 * AQ strength
2990 * Reduces blocking and blurring in flat and textured areas.
2991 * - encoding: Set by user
2992 * - decoding: unused
2993 */
2994 attribute_deprecated float aq_strength;
2995
2996 /**
2997 * PSY RD
2998 * Strength of psychovisual optimization
2999 * - encoding: Set by user
3000 * - decoding: unused
3001 */
3002 attribute_deprecated float psy_rd;
3003
3004 /**
3005 * PSY trellis
3006 * Strength of psychovisual optimization
3007 * - encoding: Set by user
3008 * - decoding: unused
3009 */
3010 attribute_deprecated float psy_trellis;
3011
3012 /**
3013 * RC lookahead
3014 * Number of frames for frametype and ratecontrol lookahead
3015 * - encoding: Set by user
3016 * - decoding: unused
3017 */
3018 attribute_deprecated int rc_lookahead;
3019
3020 /**
3021 * Constant rate factor maximum
3022 * With CRF encoding mode and VBV restrictions enabled, prevents quality from being worse
3023 * than crf_max, even if doing so would violate VBV restrictions.
3024 * - encoding: Set by user.
3025 * - decoding: unused
3026 */
3027 attribute_deprecated float crf_max;
3028 #endif
3029
3030 int log_level_offset;
3031
3032 #if FF_API_FLAC_GLOBAL_OPTS
3033 /**
3034 * Determine which LPC analysis algorithm to use.
3035 * - encoding: Set by user
3036 * - decoding: unused
3037 */
3038 attribute_deprecated enum AVLPCType lpc_type;
3039
3040 /**
3041 * Number of passes to use for Cholesky factorization during LPC analysis
3042 * - encoding: Set by user
3043 * - decoding: unused
3044 */
3045 attribute_deprecated int lpc_passes;
3046 #endif
3047
3048 /**
3049 * Number of slices.
3050 * Indicates number of picture subdivisions. Used for parallelized
3051 * decoding.
3052 * - encoding: Set by user
3053 * - decoding: unused
3054 */
3055 int slices;
3056
3057 /**
3058 * Header containing style information for text subtitles.
3059 * For SUBTITLE_ASS subtitle type, it should contain the whole ASS
3060 * [Script Info] and [V4+ Styles] section, plus the [Events] line and
3061 * the Format line following. It shouldn't include any Dialogue line.
3062 * - encoding: Set/allocated/freed by user (before avcodec_open2())
3063 * - decoding: Set/allocated/freed by libavcodec (by avcodec_open2())
3064 */
3065 uint8_t *subtitle_header;
3066 int subtitle_header_size;
3067
3068 /**
3069 * Current packet as passed into the decoder, to avoid having
3070 * to pass the packet into every function. Currently only valid
3071 * inside lavc and get/release_buffer callbacks.
3072 * - decoding: set by avcodec_decode_*, read by get_buffer() for setting pkt_pts
3073 * - encoding: unused
3074 */
3075 AVPacket *pkt;
3076
3077 #if FF_API_INTERNAL_CONTEXT
3078 /**
3079 * Whether this is a copy of the context which had init() called on it.
3080 * This is used by multithreading - shared tables and picture pointers
3081 * should be freed from the original context only.
3082 * - encoding: Set by libavcodec.
3083 * - decoding: Set by libavcodec.
3084 *
3085 * @deprecated this field has been moved to an internal context
3086 */
3087 attribute_deprecated int is_copy;
3088 #endif
3089
3090 /**
3091 * Which multithreading methods to use.
3092 * Use of FF_THREAD_FRAME will increase decoding delay by one frame per thread,
3093 * so clients which cannot provide future frames should not use it.
3094 *
3095 * - encoding: Set by user, otherwise the default is used.
3096 * - decoding: Set by user, otherwise the default is used.
3097 */
3098 int thread_type;
3099 #define FF_THREAD_FRAME 1 ///< Decode more than one frame at once
3100 #define FF_THREAD_SLICE 2 ///< Decode more than one part of a single frame at once
3101
3102 /**
3103 * Which multithreading methods are in use by the codec.
3104 * - encoding: Set by libavcodec.
3105 * - decoding: Set by libavcodec.
3106 */
3107 int active_thread_type;
3108
3109 /**
3110 * Set by the client if its custom get_buffer() callback can be called
3111 * from another thread, which allows faster multithreaded decoding.
3112 * draw_horiz_band() will be called from other threads regardless of this setting.
3113 * Ignored if the default get_buffer() is used.
3114 * - encoding: Set by user.
3115 * - decoding: Set by user.
3116 */
3117 int thread_safe_callbacks;
3118
3119 /**
3120 * VBV delay coded in the last frame (in periods of a 27 MHz clock).
3121 * Used for compliant TS muxing.
3122 * - encoding: Set by libavcodec.
3123 * - decoding: unused.
3124 */
3125 uint64_t vbv_delay;
3126
3127 /**
3128 * Type of service that the audio stream conveys.
3129 * - encoding: Set by user.
3130 * - decoding: Set by libavcodec.
3131 */
3132 enum AVAudioServiceType audio_service_type;
3133
3134 /**
3135 * Used to request a sample format from the decoder.
3136 * - encoding: unused.
3137 * - decoding: Set by user.
3138 */
3139 enum AVSampleFormat request_sample_fmt;
3140
3141 /**
3142 * Error recognition; may misdetect some more or less valid parts as errors.
3143 * - encoding: unused
3144 * - decoding: Set by user.
3145 */
3146 int err_recognition;
3147 #define AV_EF_CRCCHECK (1<<0)
3148 #define AV_EF_BITSTREAM (1<<1)
3149 #define AV_EF_BUFFER (1<<2)
3150 #define AV_EF_EXPLODE (1<<3)
3151
3152 /**
3153 * Private context used for internal data.
3154 *
3155 * Unlike priv_data, this is not codec-specific. It is used in general
3156 * libavcodec functions.
3157 */
3158 struct AVCodecInternal *internal;
3159
3160 /** Field order
3161 * - encoding: set by libavcodec
3162 * - decoding: Set by libavcodec
3163 */
3164 enum AVFieldOrder field_order;
3165 } AVCodecContext;
3166
3167 /**
3168 * AVProfile.
3169 */
3170 typedef struct AVProfile {
3171 int profile;
3172 const char *name; ///< short name for the profile
3173 } AVProfile;
3174
3175 typedef struct AVCodecDefault AVCodecDefault;
3176
3177 /**
3178 * AVCodec.
3179 */
3180 typedef struct AVCodec {
3181 /**
3182 * Name of the codec implementation.
3183 * The name is globally unique among encoders and among decoders (but an
3184 * encoder and a decoder can share the same name).
3185 * This is the primary way to find a codec from the user perspective.
3186 */
3187 const char *name;
3188 enum AVMediaType type;
3189 enum CodecID id;
3190 int priv_data_size;
3191 int (*init)(AVCodecContext *);
3192 int (*encode)(AVCodecContext *, uint8_t *buf, int buf_size, void *data);
3193 int (*close)(AVCodecContext *);
3194 int (*decode)(AVCodecContext *, void *outdata, int *outdata_size, AVPacket *avpkt);
3195 /**
3196 * Codec capabilities.
3197 * see CODEC_CAP_*
3198 */
3199 int capabilities;
3200 struct AVCodec *next;
3201 /**
3202 * Flush buffers.
3203 * Will be called when seeking
3204 */
3205 void (*flush)(AVCodecContext *);
3206 const AVRational *supported_framerates; ///< array of supported framerates, or NULL if any, array is terminated by {0,0}
3207 const enum PixelFormat *pix_fmts; ///< array of supported pixel formats, or NULL if unknown, array is terminated by -1
3208 /**
3209 * Descriptive name for the codec, meant to be more human readable than name.
3210 * You should use the NULL_IF_CONFIG_SMALL() macro to define it.
3211 */
3212 const char *long_name;
3213 const int *supported_samplerates; ///< array of supported audio samplerates, or NULL if unknown, array is terminated by 0
3214 const enum AVSampleFormat *sample_fmts; ///< array of supported sample formats, or NULL if unknown, array is terminated by -1
3215 const uint64_t *channel_layouts; ///< array of support channel layouts, or NULL if unknown. array is terminated by 0
3216 uint8_t max_lowres; ///< maximum value for lowres supported by the decoder
3217 const AVClass *priv_class; ///< AVClass for the private context
3218 const AVProfile *profiles; ///< array of recognized profiles, or NULL if unknown, array is terminated by {FF_PROFILE_UNKNOWN}
3219
3220 /**
3221 * @name Frame-level threading support functions
3222 * @{
3223 */
3224 /**
3225 * If defined, called on thread contexts when they are created.
3226 * If the codec allocates writable tables in init(), re-allocate them here.
3227 * priv_data will be set to a copy of the original.
3228 */
3229 int (*init_thread_copy)(AVCodecContext *);
3230 /**
3231 * Copy necessary context variables from a previous thread context to the current one.
3232 * If not defined, the next thread will start automatically; otherwise, the codec
3233 * must call ff_thread_finish_setup().
3234 *
3235 * dst and src will (rarely) point to the same context, in which case memcpy should be skipped.
3236 */
3237 int (*update_thread_context)(AVCodecContext *dst, const AVCodecContext *src);
3238 /** @} */
3239
3240 /**
3241 * Private codec-specific defaults.
3242 */
3243 const AVCodecDefault *defaults;
3244
3245 /**
3246 * Initialize codec static data, called from avcodec_register().
3247 */
3248 void (*init_static_data)(struct AVCodec *codec);
3249 } AVCodec;
3250
3251 /**
3252 * AVHWAccel.
3253 */
3254 typedef struct AVHWAccel {
3255 /**
3256 * Name of the hardware accelerated codec.
3257 * The name is globally unique among encoders and among decoders (but an
3258 * encoder and a decoder can share the same name).
3259 */
3260 const char *name;
3261
3262 /**
3263 * Type of codec implemented by the hardware accelerator.
3264 *
3265 * See AVMEDIA_TYPE_xxx
3266 */
3267 enum AVMediaType type;
3268
3269 /**
3270 * Codec implemented by the hardware accelerator.
3271 *
3272 * See CODEC_ID_xxx
3273 */
3274 enum CodecID id;
3275
3276 /**
3277 * Supported pixel format.
3278 *
3279 * Only hardware accelerated formats are supported here.
3280 */
3281 enum PixelFormat pix_fmt;
3282
3283 /**
3284 * Hardware accelerated codec capabilities.
3285 * see FF_HWACCEL_CODEC_CAP_*
3286 */
3287 int capabilities;
3288
3289 struct AVHWAccel *next;
3290
3291 /**
3292 * Called at the beginning of each frame or field picture.
3293 *
3294 * Meaningful frame information (codec specific) is guaranteed to
3295 * be parsed at this point. This function is mandatory.
3296 *
3297 * Note that buf can be NULL along with buf_size set to 0.
3298 * Otherwise, this means the whole frame is available at this point.
3299 *
3300 * @param avctx the codec context
3301 * @param buf the frame data buffer base
3302 * @param buf_size the size of the frame in bytes
3303 * @return zero if successful, a negative value otherwise
3304 */
3305 int (*start_frame)(AVCodecContext *avctx, const uint8_t *buf, uint32_t buf_size);
3306
3307 /**
3308 * Callback for each slice.
3309 *
3310 * Meaningful slice information (codec specific) is guaranteed to
3311 * be parsed at this point. This function is mandatory.
3312 *
3313 * @param avctx the codec context
3314 * @param buf the slice data buffer base
3315 * @param buf_size the size of the slice in bytes
3316 * @return zero if successful, a negative value otherwise
3317 */
3318 int (*decode_slice)(AVCodecContext *avctx, const uint8_t *buf, uint32_t buf_size);
3319
3320 /**
3321 * Called at the end of each frame or field picture.
3322 *
3323 * The whole picture is parsed at this point and can now be sent
3324 * to the hardware accelerator. This function is mandatory.
3325 *
3326 * @param avctx the codec context
3327 * @return zero if successful, a negative value otherwise
3328 */
3329 int (*end_frame)(AVCodecContext *avctx);
3330
3331 /**
3332 * Size of HW accelerator private data.
3333 *
3334 * Private data is allocated with av_mallocz() before
3335 * AVCodecContext.get_buffer() and deallocated after
3336 * AVCodecContext.release_buffer().
3337 */
3338 int priv_data_size;
3339 } AVHWAccel;
3340
3341 /**
3342 * four components are given, that's all.
3343 * the last component is alpha
3344 */
3345 typedef struct AVPicture {
3346 uint8_t *data[AV_NUM_DATA_POINTERS];
3347 int linesize[AV_NUM_DATA_POINTERS]; ///< number of bytes per line
3348 } AVPicture;
3349
3350 #define AVPALETTE_SIZE 1024
3351 #define AVPALETTE_COUNT 256
3352 #if FF_API_PALETTE_CONTROL
3353 /**
3354 * AVPaletteControl
3355 * This structure defines a method for communicating palette changes
3356 * between and demuxer and a decoder.
3357 *
3358 * @deprecated Use AVPacket to send palette changes instead.
3359 * This is totally broken.
3360 */
3361 typedef struct AVPaletteControl {
3362
3363 /* Demuxer sets this to 1 to indicate the palette has changed;
3364 * decoder resets to 0. */
3365 int palette_changed;
3366
3367 /* 4-byte ARGB palette entries, stored in native byte order; note that
3368 * the individual palette components should be on a 8-bit scale; if
3369 * the palette data comes from an IBM VGA native format, the component
3370 * data is probably 6 bits in size and needs to be scaled. */
3371 unsigned int palette[AVPALETTE_COUNT];
3372
3373 } AVPaletteControl attribute_deprecated;
3374 #endif
3375
3376 enum AVSubtitleType {
3377 SUBTITLE_NONE,
3378
3379 SUBTITLE_BITMAP, ///< A bitmap, pict will be set
3380
3381 /**
3382 * Plain text, the text field must be set by the decoder and is
3383 * authoritative. ass and pict fields may contain approximations.
3384 */
3385 SUBTITLE_TEXT,
3386
3387 /**
3388 * Formatted text, the ass field must be set by the decoder and is
3389 * authoritative. pict and text fields may contain approximations.
3390 */
3391 SUBTITLE_ASS,
3392 };
3393
3394 typedef struct AVSubtitleRect {
3395 int x; ///< top left corner of pict, undefined when pict is not set
3396 int y; ///< top left corner of pict, undefined when pict is not set
3397 int w; ///< width of pict, undefined when pict is not set
3398 int h; ///< height of pict, undefined when pict is not set
3399 int nb_colors; ///< number of colors in pict, undefined when pict is not set
3400
3401 /**
3402 * data+linesize for the bitmap of this subtitle.
3403 * can be set for text/ass as well once they where rendered
3404 */
3405 AVPicture pict;
3406 enum AVSubtitleType type;
3407
3408 char *text; ///< 0 terminated plain UTF-8 text
3409
3410 /**
3411 * 0 terminated ASS/SSA compatible event line.
3412 * The pressentation of this is unaffected by the other values in this
3413 * struct.
3414 */
3415 char *ass;
3416 } AVSubtitleRect;
3417
3418 typedef struct AVSubtitle {
3419 uint16_t format; /* 0 = graphics */
3420 uint32_t start_display_time; /* relative to packet pts, in ms */
3421 uint32_t end_display_time; /* relative to packet pts, in ms */
3422 unsigned num_rects;
3423 AVSubtitleRect **rects;
3424 int64_t pts; ///< Same as packet pts, in AV_TIME_BASE
3425 } AVSubtitle;
3426
3427 /* packet functions */
3428
3429 /**
3430 * @deprecated use NULL instead
3431 */
3432 attribute_deprecated void av_destruct_packet_nofree(AVPacket *pkt);
3433
3434 /**
3435 * Default packet destructor.
3436 */
3437 void av_destruct_packet(AVPacket *pkt);
3438
3439 /**
3440 * Initialize optional fields of a packet with default values.
3441 *
3442 * @param pkt packet
3443 */
3444 void av_init_packet(AVPacket *pkt);
3445
3446 /**
3447 * Allocate the payload of a packet and initialize its fields with
3448 * default values.
3449 *
3450 * @param pkt packet
3451 * @param size wanted payload size
3452 * @return 0 if OK, AVERROR_xxx otherwise
3453 */
3454 int av_new_packet(AVPacket *pkt, int size);
3455
3456 /**
3457 * Reduce packet size, correctly zeroing padding
3458 *
3459 * @param pkt packet
3460 * @param size new size
3461 */
3462 void av_shrink_packet(AVPacket *pkt, int size);
3463
3464 /**
3465 * Increase packet size, correctly zeroing padding
3466 *
3467 * @param pkt packet
3468 * @param grow_by number of bytes by which to increase the size of the packet
3469 */
3470 int av_grow_packet(AVPacket *pkt, int grow_by);
3471
3472 /**
3473 * @warning This is a hack - the packet memory allocation stuff is broken. The
3474 * packet is allocated if it was not really allocated.
3475 */
3476 int av_dup_packet(AVPacket *pkt);
3477
3478 /**
3479 * Free a packet.
3480 *
3481 * @param pkt packet to free
3482 */
3483 void av_free_packet(AVPacket *pkt);
3484
3485 /**
3486 * Allocate new information of a packet.
3487 *
3488 * @param pkt packet
3489 * @param type side information type
3490 * @param size side information size
3491 * @return pointer to fresh allocated data or NULL otherwise
3492 */
3493 uint8_t* av_packet_new_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
3494 int size);
3495
3496 /**
3497 * Get side information from packet.
3498 *
3499 * @param pkt packet
3500 * @param type desired side information type
3501 * @param size pointer for side information size to store (optional)
3502 * @return pointer to data if present or NULL otherwise
3503 */
3504 uint8_t* av_packet_get_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
3505 int *size);
3506
3507 /* resample.c */
3508
3509 struct ReSampleContext;
3510 struct AVResampleContext;
3511
3512 typedef struct ReSampleContext ReSampleContext;
3513
3514 /**
3515 * Initialize audio resampling context.
3516 *
3517 * @param output_channels number of output channels
3518 * @param input_channels number of input channels
3519 * @param output_rate output sample rate
3520 * @param input_rate input sample rate
3521 * @param sample_fmt_out requested output sample format
3522 * @param sample_fmt_in input sample format
3523 * @param filter_length length of each FIR filter in the filterbank relative to the cutoff frequency
3524 * @param log2_phase_count log2 of the number of entries in the polyphase filterbank
3525 * @param linear if 1 then the used FIR filter will be linearly interpolated
3526 between the 2 closest, if 0 the closest will be used
3527 * @param cutoff cutoff frequency, 1.0 corresponds to half the output sampling rate
3528 * @return allocated ReSampleContext, NULL if error occurred
3529 */
3530 ReSampleContext *av_audio_resample_init(int output_channels, int input_channels,
3531 int output_rate, int input_rate,
3532 enum AVSampleFormat sample_fmt_out,
3533 enum AVSampleFormat sample_fmt_in,
3534 int filter_length, int log2_phase_count,
3535 int linear, double cutoff);
3536
3537 int audio_resample(ReSampleContext *s, short *output, short *input, int nb_samples);
3538
3539 /**
3540 * Free resample context.
3541 *
3542 * @param s a non-NULL pointer to a resample context previously
3543 * created with av_audio_resample_init()
3544 */
3545 void audio_resample_close(ReSampleContext *s);
3546
3547
3548 /**
3549 * Initialize an audio resampler.
3550 * Note, if either rate is not an integer then simply scale both rates up so they are.
3551 * @param filter_length length of each FIR filter in the filterbank relative to the cutoff freq
3552 * @param log2_phase_count log2 of the number of entries in the polyphase filterbank
3553 * @param linear If 1 then the used FIR filter will be linearly interpolated
3554 between the 2 closest, if 0 the closest will be used
3555 * @param cutoff cutoff frequency, 1.0 corresponds to half the output sampling rate
3556 */
3557 struct AVResampleContext *av_resample_init(int out_rate, int in_rate, int filter_length, int log2_phase_count, int linear, double cutoff);
3558
3559 /**
3560 * Resample an array of samples using a previously configured context.
3561 * @param src an array of unconsumed samples
3562 * @param consumed the number of samples of src which have been consumed are returned here
3563 * @param src_size the number of unconsumed samples available
3564 * @param dst_size the amount of space in samples available in dst
3565 * @param update_ctx If this is 0 then the context will not be modified, that way several channels can be resampled with the same context.
3566 * @return the number of samples written in dst or -1 if an error occurred
3567 */
3568 int av_resample(struct AVResampleContext *c, short *dst, short *src, int *consumed, int src_size, int dst_size, int update_ctx);
3569
3570
3571 /**
3572 * Compensate samplerate/timestamp drift. The compensation is done by changing
3573 * the resampler parameters, so no audible clicks or similar distortions occur
3574 * @param compensation_distance distance in output samples over which the compensation should be performed
3575 * @param sample_delta number of output samples which should be output less
3576 *
3577 * example: av_resample_compensate(c, 10, 500)
3578 * here instead of 510 samples only 500 samples would be output
3579 *
3580 * note, due to rounding the actual compensation might be slightly different,
3581 * especially if the compensation_distance is large and the in_rate used during init is small
3582 */
3583 void av_resample_compensate(struct AVResampleContext *c, int sample_delta, int compensation_distance);
3584 void av_resample_close(struct AVResampleContext *c);
3585
3586 /**
3587 * Allocate memory for a picture. Call avpicture_free() to free it.
3588 *
3589 * @see avpicture_fill()
3590 *
3591 * @param picture the picture to be filled in
3592 * @param pix_fmt the format of the picture
3593 * @param width the width of the picture
3594 * @param height the height of the picture
3595 * @return zero if successful, a negative value if not
3596 */
3597 int avpicture_alloc(AVPicture *picture, enum PixelFormat pix_fmt, int width, int height);
3598
3599 /**
3600 * Free a picture previously allocated by avpicture_alloc().
3601 * The data buffer used by the AVPicture is freed, but the AVPicture structure
3602 * itself is not.
3603 *
3604 * @param picture the AVPicture to be freed
3605 */
3606 void avpicture_free(AVPicture *picture);
3607
3608 /**
3609 * Fill in the AVPicture fields.
3610 * The fields of the given AVPicture are filled in by using the 'ptr' address
3611 * which points to the image data buffer. Depending on the specified picture
3612 * format, one or multiple image data pointers and line sizes will be set.
3613 * If a planar format is specified, several pointers will be set pointing to
3614 * the different picture planes and the line sizes of the different planes
3615 * will be stored in the lines_sizes array.
3616 * Call with ptr == NULL to get the required size for the ptr buffer.
3617 *
3618 * To allocate the buffer and fill in the AVPicture fields in one call,
3619 * use avpicture_alloc().
3620 *
3621 * @param picture AVPicture whose fields are to be filled in
3622 * @param ptr Buffer which will contain or contains the actual image data
3623 * @param pix_fmt The format in which the picture data is stored.
3624 * @param width the width of the image in pixels
3625 * @param height the height of the image in pixels
3626 * @return size of the image data in bytes
3627 */
3628 int avpicture_fill(AVPicture *picture, uint8_t *ptr,
3629 enum PixelFormat pix_fmt, int width, int height);
3630
3631 /**
3632 * Copy pixel data from an AVPicture into a buffer.
3633 * The data is stored compactly, without any gaps for alignment or padding
3634 * which may be applied by avpicture_fill().
3635 *
3636 * @see avpicture_get_size()
3637 *
3638 * @param[in] src AVPicture containing image data
3639 * @param[in] pix_fmt The format in which the picture data is stored.
3640 * @param[in] width the width of the image in pixels.
3641 * @param[in] height the height of the image in pixels.
3642 * @param[out] dest A buffer into which picture data will be copied.
3643 * @param[in] dest_size The size of 'dest'.
3644 * @return The number of bytes written to dest, or a negative value (error code) on error.
3645 */
3646 int avpicture_layout(const AVPicture* src, enum PixelFormat pix_fmt, int width, int height,
3647 unsigned char *dest, int dest_size);
3648
3649 /**
3650 * Calculate the size in bytes that a picture of the given width and height
3651 * would occupy if stored in the given picture format.
3652 * Note that this returns the size of a compact representation as generated
3653 * by avpicture_layout(), which can be smaller than the size required for e.g.
3654 * avpicture_fill().
3655 *
3656 * @param pix_fmt the given picture format
3657 * @param width the width of the image
3658 * @param height the height of the image
3659 * @return Image data size in bytes or -1 on error (e.g. too large dimensions).
3660 */
3661 int avpicture_get_size(enum PixelFormat pix_fmt, int width, int height);
3662 void avcodec_get_chroma_sub_sample(enum PixelFormat pix_fmt, int *h_shift, int *v_shift);
3663
3664 #if FF_API_GET_PIX_FMT_NAME
3665 /**
3666 * @deprecated Deprecated in favor of av_get_pix_fmt_name().
3667 */
3668 attribute_deprecated
3669 const char *avcodec_get_pix_fmt_name(enum PixelFormat pix_fmt);
3670 #endif
3671
3672 void avcodec_set_dimensions(AVCodecContext *s, int width, int height);
3673
3674 /**
3675 * Return a value representing the fourCC code associated to the
3676 * pixel format pix_fmt, or 0 if no associated fourCC code can be
3677 * found.
3678 */
3679 unsigned int avcodec_pix_fmt_to_codec_tag(enum PixelFormat pix_fmt);
3680
3681 /**
3682 * Put a string representing the codec tag codec_tag in buf.
3683 *
3684 * @param buf_size size in bytes of buf
3685 * @return the length of the string that would have been generated if
3686 * enough space had been available, excluding the trailing null
3687 */
3688 size_t av_get_codec_tag_string(char *buf, size_t buf_size, unsigned int codec_tag);
3689
3690 #define FF_LOSS_RESOLUTION 0x0001 /**< loss due to resolution change */
3691 #define FF_LOSS_DEPTH 0x0002 /**< loss due to color depth change */
3692 #define FF_LOSS_COLORSPACE 0x0004 /**< loss due to color space conversion */
3693 #define FF_LOSS_ALPHA 0x0008 /**< loss of alpha bits */
3694 #define FF_LOSS_COLORQUANT 0x0010 /**< loss due to color quantization */
3695 #define FF_LOSS_CHROMA 0x0020 /**< loss of chroma (e.g. RGB to gray conversion) */
3696
3697 /**
3698 * Compute what kind of losses will occur when converting from one specific
3699 * pixel format to another.
3700 * When converting from one pixel format to another, information loss may occur.
3701 * For example, when converting from RGB24 to GRAY, the color information will
3702 * be lost. Similarly, other losses occur when converting from some formats to
3703 * other formats. These losses can involve loss of chroma, but also loss of
3704 * resolution, loss of color depth, loss due to the color space conversion, loss
3705 * of the alpha bits or loss due to color quantization.
3706 * avcodec_get_fix_fmt_loss() informs you about the various types of losses
3707 * which will occur when converting from one pixel format to another.
3708 *
3709 * @param[in] dst_pix_fmt destination pixel format
3710 * @param[in] src_pix_fmt source pixel format
3711 * @param[in] has_alpha Whether the source pixel format alpha channel is used.
3712 * @return Combination of flags informing you what kind of losses will occur.
3713 */
3714 int avcodec_get_pix_fmt_loss(enum PixelFormat dst_pix_fmt, enum PixelFormat src_pix_fmt,
3715 int has_alpha);
3716
3717 /**
3718 * Find the best pixel format to convert to given a certain source pixel
3719 * format. When converting from one pixel format to another, information loss
3720 * may occur. For example, when converting from RGB24 to GRAY, the color
3721 * information will be lost. Similarly, other losses occur when converting from
3722 * some formats to other formats. avcodec_find_best_pix_fmt() searches which of
3723 * the given pixel formats should be used to suffer the least amount of loss.
3724 * The pixel formats from which it chooses one, are determined by the
3725 * pix_fmt_mask parameter.
3726 *
3727 * @code
3728 * src_pix_fmt = PIX_FMT_YUV420P;
3729 * pix_fmt_mask = (1 << PIX_FMT_YUV422P) || (1 << PIX_FMT_RGB24);
3730 * dst_pix_fmt = avcodec_find_best_pix_fmt(pix_fmt_mask, src_pix_fmt, alpha, &loss);
3731 * @endcode
3732 *
3733 * @param[in] pix_fmt_mask bitmask determining which pixel format to choose from
3734 * @param[in] src_pix_fmt source pixel format
3735 * @param[in] has_alpha Whether the source pixel format alpha channel is used.
3736 * @param[out] loss_ptr Combination of flags informing you what kind of losses will occur.
3737 * @return The best pixel format to convert to or -1 if none was found.
3738 */
3739 enum PixelFormat avcodec_find_best_pix_fmt(int64_t pix_fmt_mask, enum PixelFormat src_pix_fmt,
3740 int has_alpha, int *loss_ptr);
3741
3742 #if FF_API_GET_ALPHA_INFO
3743 #define FF_ALPHA_TRANSP 0x0001 /* image has some totally transparent pixels */
3744 #define FF_ALPHA_SEMI_TRANSP 0x0002 /* image has some transparent pixels */
3745
3746 /**
3747 * Tell if an image really has transparent alpha values.
3748 * @return ored mask of FF_ALPHA_xxx constants
3749 */
3750 attribute_deprecated
3751 int img_get_alpha_info(const AVPicture *src,
3752 enum PixelFormat pix_fmt, int width, int height);
3753 #endif
3754
3755 /* deinterlace a picture */
3756 /* deinterlace - if not supported return -1 */
3757 int avpicture_deinterlace(AVPicture *dst, const AVPicture *src,
3758 enum PixelFormat pix_fmt, int width, int height);
3759
3760 /* external high level API */
3761
3762 /**
3763 * If c is NULL, returns the first registered codec,
3764 * if c is non-NULL, returns the next registered codec after c,
3765 * or NULL if c is the last one.
3766 */
3767 AVCodec *av_codec_next(AVCodec *c);
3768
3769 /**
3770 * Return the LIBAVCODEC_VERSION_INT constant.
3771 */
3772 unsigned avcodec_version(void);
3773
3774 /**
3775 * Return the libavcodec build-time configuration.
3776 */
3777 const char *avcodec_configuration(void);
3778
3779 /**
3780 * Return the libavcodec license.
3781 */
3782 const char *avcodec_license(void);
3783
3784 #if FF_API_AVCODEC_INIT
3785 /**
3786 * @deprecated this function is called automatically from avcodec_register()
3787 * and avcodec_register_all(), there is no need to call it manually
3788 */
3789 attribute_deprecated
3790 void avcodec_init(void);
3791 #endif
3792
3793 /**
3794 * Register the codec codec and initialize libavcodec.
3795 *
3796 * @warning either this function or avcodec_register_all() must be called
3797 * before any other libavcodec functions.
3798 *
3799 * @see avcodec_register_all()
3800 */
3801 void avcodec_register(AVCodec *codec);
3802
3803 /**
3804 * Find a registered encoder with a matching codec ID.
3805 *
3806 * @param id CodecID of the requested encoder
3807 * @return An encoder if one was found, NULL otherwise.
3808 */
3809 AVCodec *avcodec_find_encoder(enum CodecID id);
3810
3811 /**
3812 * Find a registered encoder with the specified name.
3813 *
3814 * @param name name of the requested encoder
3815 * @return An encoder if one was found, NULL otherwise.
3816 */
3817 AVCodec *avcodec_find_encoder_by_name(const char *name);
3818
3819 /**
3820 * Find a registered decoder with a matching codec ID.
3821 *
3822 * @param id CodecID of the requested decoder
3823 * @return A decoder if one was found, NULL otherwise.
3824 */
3825 AVCodec *avcodec_find_decoder(enum CodecID id);
3826
3827 /**
3828 * Find a registered decoder with the specified name.
3829 *
3830 * @param name name of the requested decoder
3831 * @return A decoder if one was found, NULL otherwise.
3832 */
3833 AVCodec *avcodec_find_decoder_by_name(const char *name);
3834 void avcodec_string(char *buf, int buf_size, AVCodecContext *enc, int encode);
3835
3836 /**
3837 * Return a name for the specified profile, if available.
3838 *
3839 * @param codec the codec that is searched for the given profile
3840 * @param profile the profile value for which a name is requested
3841 * @return A name for the profile if found, NULL otherwise.
3842 */
3843 const char *</