8eb7c3c27c7f492c7b20e3bf36fb0395ad6c41df
[libav.git] / libavcodec / avcodec.h
1 /*
2 * copyright (c) 2001 Fabrice Bellard
3 *
4 * This file is part of FFmpeg.
5 *
6 * FFmpeg is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
10 *
11 * FFmpeg is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
15 *
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with FFmpeg; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19 */
20
21 #ifndef AVCODEC_AVCODEC_H
22 #define AVCODEC_AVCODEC_H
23
24 /**
25 * @file libavcodec/avcodec.h
26 * external API header
27 */
28
29 #include <errno.h>
30 #include "libavutil/avutil.h"
31
32 #define LIBAVCODEC_VERSION_MAJOR 52
33 #define LIBAVCODEC_VERSION_MINOR 32
34 #define LIBAVCODEC_VERSION_MICRO 0
35
36 #define LIBAVCODEC_VERSION_INT AV_VERSION_INT(LIBAVCODEC_VERSION_MAJOR, \
37 LIBAVCODEC_VERSION_MINOR, \
38 LIBAVCODEC_VERSION_MICRO)
39 #define LIBAVCODEC_VERSION AV_VERSION(LIBAVCODEC_VERSION_MAJOR, \
40 LIBAVCODEC_VERSION_MINOR, \
41 LIBAVCODEC_VERSION_MICRO)
42 #define LIBAVCODEC_BUILD LIBAVCODEC_VERSION_INT
43
44 #define LIBAVCODEC_IDENT "Lavc" AV_STRINGIFY(LIBAVCODEC_VERSION)
45
46 #define AV_NOPTS_VALUE INT64_C(0x8000000000000000)
47 #define AV_TIME_BASE 1000000
48 #define AV_TIME_BASE_Q (AVRational){1, AV_TIME_BASE}
49
50 /**
51 * Identifies the syntax and semantics of the bitstream.
52 * The principle is roughly:
53 * Two decoders with the same ID can decode the same streams.
54 * Two encoders with the same ID can encode compatible streams.
55 * There may be slight deviations from the principle due to implementation
56 * details.
57 *
58 * If you add a codec ID to this list, add it so that
59 * 1. no value of a existing codec ID changes (that would break ABI),
60 * 2. it is as close as possible to similar codecs.
61 */
62 enum CodecID {
63 CODEC_ID_NONE,
64
65 /* video codecs */
66 CODEC_ID_MPEG1VIDEO,
67 CODEC_ID_MPEG2VIDEO, ///< preferred ID for MPEG-1/2 video decoding
68 CODEC_ID_MPEG2VIDEO_XVMC,
69 CODEC_ID_H261,
70 CODEC_ID_H263,
71 CODEC_ID_RV10,
72 CODEC_ID_RV20,
73 CODEC_ID_MJPEG,
74 CODEC_ID_MJPEGB,
75 CODEC_ID_LJPEG,
76 CODEC_ID_SP5X,
77 CODEC_ID_JPEGLS,
78 CODEC_ID_MPEG4,
79 CODEC_ID_RAWVIDEO,
80 CODEC_ID_MSMPEG4V1,
81 CODEC_ID_MSMPEG4V2,
82 CODEC_ID_MSMPEG4V3,
83 CODEC_ID_WMV1,
84 CODEC_ID_WMV2,
85 CODEC_ID_H263P,
86 CODEC_ID_H263I,
87 CODEC_ID_FLV1,
88 CODEC_ID_SVQ1,
89 CODEC_ID_SVQ3,
90 CODEC_ID_DVVIDEO,
91 CODEC_ID_HUFFYUV,
92 CODEC_ID_CYUV,
93 CODEC_ID_H264,
94 CODEC_ID_INDEO3,
95 CODEC_ID_VP3,
96 CODEC_ID_THEORA,
97 CODEC_ID_ASV1,
98 CODEC_ID_ASV2,
99 CODEC_ID_FFV1,
100 CODEC_ID_4XM,
101 CODEC_ID_VCR1,
102 CODEC_ID_CLJR,
103 CODEC_ID_MDEC,
104 CODEC_ID_ROQ,
105 CODEC_ID_INTERPLAY_VIDEO,
106 CODEC_ID_XAN_WC3,
107 CODEC_ID_XAN_WC4,
108 CODEC_ID_RPZA,
109 CODEC_ID_CINEPAK,
110 CODEC_ID_WS_VQA,
111 CODEC_ID_MSRLE,
112 CODEC_ID_MSVIDEO1,
113 CODEC_ID_IDCIN,
114 CODEC_ID_8BPS,
115 CODEC_ID_SMC,
116 CODEC_ID_FLIC,
117 CODEC_ID_TRUEMOTION1,
118 CODEC_ID_VMDVIDEO,
119 CODEC_ID_MSZH,
120 CODEC_ID_ZLIB,
121 CODEC_ID_QTRLE,
122 CODEC_ID_SNOW,
123 CODEC_ID_TSCC,
124 CODEC_ID_ULTI,
125 CODEC_ID_QDRAW,
126 CODEC_ID_VIXL,
127 CODEC_ID_QPEG,
128 CODEC_ID_XVID,
129 CODEC_ID_PNG,
130 CODEC_ID_PPM,
131 CODEC_ID_PBM,
132 CODEC_ID_PGM,
133 CODEC_ID_PGMYUV,
134 CODEC_ID_PAM,
135 CODEC_ID_FFVHUFF,
136 CODEC_ID_RV30,
137 CODEC_ID_RV40,
138 CODEC_ID_VC1,
139 CODEC_ID_WMV3,
140 CODEC_ID_LOCO,
141 CODEC_ID_WNV1,
142 CODEC_ID_AASC,
143 CODEC_ID_INDEO2,
144 CODEC_ID_FRAPS,
145 CODEC_ID_TRUEMOTION2,
146 CODEC_ID_BMP,
147 CODEC_ID_CSCD,
148 CODEC_ID_MMVIDEO,
149 CODEC_ID_ZMBV,
150 CODEC_ID_AVS,
151 CODEC_ID_SMACKVIDEO,
152 CODEC_ID_NUV,
153 CODEC_ID_KMVC,
154 CODEC_ID_FLASHSV,
155 CODEC_ID_CAVS,
156 CODEC_ID_JPEG2000,
157 CODEC_ID_VMNC,
158 CODEC_ID_VP5,
159 CODEC_ID_VP6,
160 CODEC_ID_VP6F,
161 CODEC_ID_TARGA,
162 CODEC_ID_DSICINVIDEO,
163 CODEC_ID_TIERTEXSEQVIDEO,
164 CODEC_ID_TIFF,
165 CODEC_ID_GIF,
166 CODEC_ID_FFH264,
167 CODEC_ID_DXA,
168 CODEC_ID_DNXHD,
169 CODEC_ID_THP,
170 CODEC_ID_SGI,
171 CODEC_ID_C93,
172 CODEC_ID_BETHSOFTVID,
173 CODEC_ID_PTX,
174 CODEC_ID_TXD,
175 CODEC_ID_VP6A,
176 CODEC_ID_AMV,
177 CODEC_ID_VB,
178 CODEC_ID_PCX,
179 CODEC_ID_SUNRAST,
180 CODEC_ID_INDEO4,
181 CODEC_ID_INDEO5,
182 CODEC_ID_MIMIC,
183 CODEC_ID_RL2,
184 CODEC_ID_8SVX_EXP,
185 CODEC_ID_8SVX_FIB,
186 CODEC_ID_ESCAPE124,
187 CODEC_ID_DIRAC,
188 CODEC_ID_BFI,
189 CODEC_ID_CMV,
190 CODEC_ID_MOTIONPIXELS,
191 CODEC_ID_TGV,
192 CODEC_ID_TGQ,
193 CODEC_ID_TQI,
194 CODEC_ID_AURA,
195 CODEC_ID_AURA2,
196 CODEC_ID_V210X,
197 CODEC_ID_TMV,
198 CODEC_ID_V210,
199 CODEC_ID_DPX,
200 CODEC_ID_MAD,
201
202 /* various PCM "codecs" */
203 CODEC_ID_PCM_S16LE= 0x10000,
204 CODEC_ID_PCM_S16BE,
205 CODEC_ID_PCM_U16LE,
206 CODEC_ID_PCM_U16BE,
207 CODEC_ID_PCM_S8,
208 CODEC_ID_PCM_U8,
209 CODEC_ID_PCM_MULAW,
210 CODEC_ID_PCM_ALAW,
211 CODEC_ID_PCM_S32LE,
212 CODEC_ID_PCM_S32BE,
213 CODEC_ID_PCM_U32LE,
214 CODEC_ID_PCM_U32BE,
215 CODEC_ID_PCM_S24LE,
216 CODEC_ID_PCM_S24BE,
217 CODEC_ID_PCM_U24LE,
218 CODEC_ID_PCM_U24BE,
219 CODEC_ID_PCM_S24DAUD,
220 CODEC_ID_PCM_ZORK,
221 CODEC_ID_PCM_S16LE_PLANAR,
222 CODEC_ID_PCM_DVD,
223 CODEC_ID_PCM_F32BE,
224 CODEC_ID_PCM_F32LE,
225 CODEC_ID_PCM_F64BE,
226 CODEC_ID_PCM_F64LE,
227
228 /* various ADPCM codecs */
229 CODEC_ID_ADPCM_IMA_QT= 0x11000,
230 CODEC_ID_ADPCM_IMA_WAV,
231 CODEC_ID_ADPCM_IMA_DK3,
232 CODEC_ID_ADPCM_IMA_DK4,
233 CODEC_ID_ADPCM_IMA_WS,
234 CODEC_ID_ADPCM_IMA_SMJPEG,
235 CODEC_ID_ADPCM_MS,
236 CODEC_ID_ADPCM_4XM,
237 CODEC_ID_ADPCM_XA,
238 CODEC_ID_ADPCM_ADX,
239 CODEC_ID_ADPCM_EA,
240 CODEC_ID_ADPCM_G726,
241 CODEC_ID_ADPCM_CT,
242 CODEC_ID_ADPCM_SWF,
243 CODEC_ID_ADPCM_YAMAHA,
244 CODEC_ID_ADPCM_SBPRO_4,
245 CODEC_ID_ADPCM_SBPRO_3,
246 CODEC_ID_ADPCM_SBPRO_2,
247 CODEC_ID_ADPCM_THP,
248 CODEC_ID_ADPCM_IMA_AMV,
249 CODEC_ID_ADPCM_EA_R1,
250 CODEC_ID_ADPCM_EA_R3,
251 CODEC_ID_ADPCM_EA_R2,
252 CODEC_ID_ADPCM_IMA_EA_SEAD,
253 CODEC_ID_ADPCM_IMA_EA_EACS,
254 CODEC_ID_ADPCM_EA_XAS,
255 CODEC_ID_ADPCM_EA_MAXIS_XA,
256 CODEC_ID_ADPCM_IMA_ISS,
257
258 /* AMR */
259 CODEC_ID_AMR_NB= 0x12000,
260 CODEC_ID_AMR_WB,
261
262 /* RealAudio codecs*/
263 CODEC_ID_RA_144= 0x13000,
264 CODEC_ID_RA_288,
265
266 /* various DPCM codecs */
267 CODEC_ID_ROQ_DPCM= 0x14000,
268 CODEC_ID_INTERPLAY_DPCM,
269 CODEC_ID_XAN_DPCM,
270 CODEC_ID_SOL_DPCM,
271
272 /* audio codecs */
273 CODEC_ID_MP2= 0x15000,
274 CODEC_ID_MP3, ///< preferred ID for decoding MPEG audio layer 1, 2 or 3
275 CODEC_ID_AAC,
276 CODEC_ID_AC3,
277 CODEC_ID_DTS,
278 CODEC_ID_VORBIS,
279 CODEC_ID_DVAUDIO,
280 CODEC_ID_WMAV1,
281 CODEC_ID_WMAV2,
282 CODEC_ID_MACE3,
283 CODEC_ID_MACE6,
284 CODEC_ID_VMDAUDIO,
285 CODEC_ID_SONIC,
286 CODEC_ID_SONIC_LS,
287 CODEC_ID_FLAC,
288 CODEC_ID_MP3ADU,
289 CODEC_ID_MP3ON4,
290 CODEC_ID_SHORTEN,
291 CODEC_ID_ALAC,
292 CODEC_ID_WESTWOOD_SND1,
293 CODEC_ID_GSM, ///< as in Berlin toast format
294 CODEC_ID_QDM2,
295 CODEC_ID_COOK,
296 CODEC_ID_TRUESPEECH,
297 CODEC_ID_TTA,
298 CODEC_ID_SMACKAUDIO,
299 CODEC_ID_QCELP,
300 CODEC_ID_WAVPACK,
301 CODEC_ID_DSICINAUDIO,
302 CODEC_ID_IMC,
303 CODEC_ID_MUSEPACK7,
304 CODEC_ID_MLP,
305 CODEC_ID_GSM_MS, /* as found in WAV */
306 CODEC_ID_ATRAC3,
307 CODEC_ID_VOXWARE,
308 CODEC_ID_APE,
309 CODEC_ID_NELLYMOSER,
310 CODEC_ID_MUSEPACK8,
311 CODEC_ID_SPEEX,
312 CODEC_ID_WMAVOICE,
313 CODEC_ID_WMAPRO,
314 CODEC_ID_WMALOSSLESS,
315 CODEC_ID_ATRAC3P,
316 CODEC_ID_EAC3,
317 CODEC_ID_SIPR,
318 CODEC_ID_MP1,
319 CODEC_ID_TWINVQ,
320 CODEC_ID_TRUEHD,
321 CODEC_ID_MP4ALS,
322
323 /* subtitle codecs */
324 CODEC_ID_DVD_SUBTITLE= 0x17000,
325 CODEC_ID_DVB_SUBTITLE,
326 CODEC_ID_TEXT, ///< raw UTF-8 text
327 CODEC_ID_XSUB,
328 CODEC_ID_SSA,
329 CODEC_ID_MOV_TEXT,
330
331 /* other specific kind of codecs (generally used for attachments) */
332 CODEC_ID_TTF= 0x18000,
333
334 CODEC_ID_PROBE= 0x19000, ///< codec_id is not known (like CODEC_ID_NONE) but lavf should attempt to identify it
335
336 CODEC_ID_MPEG2TS= 0x20000, /**< _FAKE_ codec to indicate a raw MPEG-2 TS
337 * stream (only used by libavformat) */
338 };
339
340 enum CodecType {
341 CODEC_TYPE_UNKNOWN = -1,
342 CODEC_TYPE_VIDEO,
343 CODEC_TYPE_AUDIO,
344 CODEC_TYPE_DATA,
345 CODEC_TYPE_SUBTITLE,
346 CODEC_TYPE_ATTACHMENT,
347 CODEC_TYPE_NB
348 };
349
350 /**
351 * all in native-endian format
352 */
353 enum SampleFormat {
354 SAMPLE_FMT_NONE = -1,
355 SAMPLE_FMT_U8, ///< unsigned 8 bits
356 SAMPLE_FMT_S16, ///< signed 16 bits
357 SAMPLE_FMT_S32, ///< signed 32 bits
358 SAMPLE_FMT_FLT, ///< float
359 SAMPLE_FMT_DBL, ///< double
360 SAMPLE_FMT_NB ///< Number of sample formats. DO NOT USE if dynamically linking to libavcodec
361 };
362
363 /* Audio channel masks */
364 #define CH_FRONT_LEFT 0x00000001
365 #define CH_FRONT_RIGHT 0x00000002
366 #define CH_FRONT_CENTER 0x00000004
367 #define CH_LOW_FREQUENCY 0x00000008
368 #define CH_BACK_LEFT 0x00000010
369 #define CH_BACK_RIGHT 0x00000020
370 #define CH_FRONT_LEFT_OF_CENTER 0x00000040
371 #define CH_FRONT_RIGHT_OF_CENTER 0x00000080
372 #define CH_BACK_CENTER 0x00000100
373 #define CH_SIDE_LEFT 0x00000200
374 #define CH_SIDE_RIGHT 0x00000400
375 #define CH_TOP_CENTER 0x00000800
376 #define CH_TOP_FRONT_LEFT 0x00001000
377 #define CH_TOP_FRONT_CENTER 0x00002000
378 #define CH_TOP_FRONT_RIGHT 0x00004000
379 #define CH_TOP_BACK_LEFT 0x00008000
380 #define CH_TOP_BACK_CENTER 0x00010000
381 #define CH_TOP_BACK_RIGHT 0x00020000
382 #define CH_STEREO_LEFT 0x20000000 ///< Stereo downmix.
383 #define CH_STEREO_RIGHT 0x40000000 ///< See CH_STEREO_LEFT.
384
385 /* Audio channel convenience macros */
386 #define CH_LAYOUT_MONO (CH_FRONT_CENTER)
387 #define CH_LAYOUT_STEREO (CH_FRONT_LEFT|CH_FRONT_RIGHT)
388 #define CH_LAYOUT_2_1 (CH_LAYOUT_STEREO|CH_BACK_CENTER)
389 #define CH_LAYOUT_SURROUND (CH_LAYOUT_STEREO|CH_FRONT_CENTER)
390 #define CH_LAYOUT_4POINT0 (CH_LAYOUT_SURROUND|CH_BACK_CENTER)
391 #define CH_LAYOUT_2_2 (CH_LAYOUT_STEREO|CH_SIDE_LEFT|CH_SIDE_RIGHT)
392 #define CH_LAYOUT_QUAD (CH_LAYOUT_STEREO|CH_BACK_LEFT|CH_BACK_RIGHT)
393 #define CH_LAYOUT_5POINT0 (CH_LAYOUT_SURROUND|CH_SIDE_LEFT|CH_SIDE_RIGHT)
394 #define CH_LAYOUT_5POINT1 (CH_LAYOUT_5POINT0|CH_LOW_FREQUENCY)
395 #define CH_LAYOUT_5POINT0_BACK (CH_LAYOUT_SURROUND|CH_BACK_LEFT|CH_BACK_RIGHT)
396 #define CH_LAYOUT_5POINT1_BACK (CH_LAYOUT_5POINT0_BACK|CH_LOW_FREQUENCY)
397 #define CH_LAYOUT_7POINT1 (CH_LAYOUT_5POINT1|CH_BACK_LEFT|CH_BACK_RIGHT)
398 #define CH_LAYOUT_7POINT1_WIDE (CH_LAYOUT_5POINT1_BACK|\
399 CH_FRONT_LEFT_OF_CENTER|CH_FRONT_RIGHT_OF_CENTER)
400 #define CH_LAYOUT_STEREO_DOWNMIX (CH_STEREO_LEFT|CH_STEREO_RIGHT)
401
402 /* in bytes */
403 #define AVCODEC_MAX_AUDIO_FRAME_SIZE 192000 // 1 second of 48khz 32bit audio
404
405 /**
406 * Required number of additionally allocated bytes at the end of the input bitstream for decoding.
407 * This is mainly needed because some optimized bitstream readers read
408 * 32 or 64 bit at once and could read over the end.<br>
409 * Note: If the first 23 bits of the additional bytes are not 0, then damaged
410 * MPEG bitstreams could cause overread and segfault.
411 */
412 #define FF_INPUT_BUFFER_PADDING_SIZE 8
413
414 /**
415 * minimum encoding buffer size
416 * Used to avoid some checks during header writing.
417 */
418 #define FF_MIN_BUFFER_SIZE 16384
419
420
421 /**
422 * motion estimation type.
423 */
424 enum Motion_Est_ID {
425 ME_ZERO = 1, ///< no search, that is use 0,0 vector whenever one is needed
426 ME_FULL,
427 ME_LOG,
428 ME_PHODS,
429 ME_EPZS, ///< enhanced predictive zonal search
430 ME_X1, ///< reserved for experiments
431 ME_HEX, ///< hexagon based search
432 ME_UMH, ///< uneven multi-hexagon search
433 ME_ITER, ///< iterative search
434 ME_TESA, ///< transformed exhaustive search algorithm
435 };
436
437 enum AVDiscard{
438 /* We leave some space between them for extensions (drop some
439 * keyframes for intra-only or drop just some bidir frames). */
440 AVDISCARD_NONE =-16, ///< discard nothing
441 AVDISCARD_DEFAULT= 0, ///< discard useless packets like 0 size packets in avi
442 AVDISCARD_NONREF = 8, ///< discard all non reference
443 AVDISCARD_BIDIR = 16, ///< discard all bidirectional frames
444 AVDISCARD_NONKEY = 32, ///< discard all frames except keyframes
445 AVDISCARD_ALL = 48, ///< discard all
446 };
447
448 enum AVColorPrimaries{
449 AVCOL_PRI_BT709 =1, ///< also ITU-R BT1361 / IEC 61966-2-4 / SMPTE RP177 Annex B
450 AVCOL_PRI_UNSPECIFIED=2,
451 AVCOL_PRI_BT470M =4,
452 AVCOL_PRI_BT470BG =5, ///< also ITU-R BT601-6 625 / ITU-R BT1358 625 / ITU-R BT1700 625 PAL & SECAM
453 AVCOL_PRI_SMPTE170M =6, ///< also ITU-R BT601-6 525 / ITU-R BT1358 525 / ITU-R BT1700 NTSC
454 AVCOL_PRI_SMPTE240M =7, ///< functionally identical to above
455 AVCOL_PRI_FILM =8,
456 AVCOL_PRI_NB , ///< Not part of ABI
457 };
458
459 enum AVColorTransferCharacteristic{
460 AVCOL_TRC_BT709 =1, ///< also ITU-R BT1361
461 AVCOL_TRC_UNSPECIFIED=2,
462 AVCOL_TRC_GAMMA22 =4, ///< also ITU-R BT470M / ITU-R BT1700 625 PAL & SECAM
463 AVCOL_TRC_GAMMA28 =5, ///< also ITU-R BT470BG
464 AVCOL_TRC_NB , ///< Not part of ABI
465 };
466
467 enum AVColorSpace{
468 AVCOL_SPC_RGB =0,
469 AVCOL_SPC_BT709 =1, ///< also ITU-R BT1361 / IEC 61966-2-4 xvYCC709 / SMPTE RP177 Annex B
470 AVCOL_SPC_UNSPECIFIED=2,
471 AVCOL_SPC_FCC =4,
472 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
473 AVCOL_SPC_SMPTE170M =6, ///< also ITU-R BT601-6 525 / ITU-R BT1358 525 / ITU-R BT1700 NTSC / functionally identical to above
474 AVCOL_SPC_SMPTE240M =7,
475 AVCOL_SPC_NB , ///< Not part of ABI
476 };
477
478 enum AVColorRange{
479 AVCOL_RANGE_UNSPECIFIED=0,
480 AVCOL_RANGE_MPEG =1, ///< the normal 219*2^(n-8) "MPEG" YUV ranges
481 AVCOL_RANGE_JPEG =2, ///< the normal 2^n-1 "JPEG" YUV ranges
482 AVCOL_RANGE_NB , ///< Not part of ABI
483 };
484
485 /**
486 * X X 3 4 X X are luma samples,
487 * 1 2 1-6 are possible chroma positions
488 * X X 5 6 X 0 is undefined/unknown position
489 */
490 enum AVChromaLocation{
491 AVCHROMA_LOC_UNSPECIFIED=0,
492 AVCHROMA_LOC_LEFT =1, ///< mpeg2/4, h264 default
493 AVCHROMA_LOC_CENTER =2, ///< mpeg1, jpeg, h263
494 AVCHROMA_LOC_TOPLEFT =3, ///< DV
495 AVCHROMA_LOC_TOP =4,
496 AVCHROMA_LOC_BOTTOMLEFT =5,
497 AVCHROMA_LOC_BOTTOM =6,
498 AVCHROMA_LOC_NB , ///< Not part of ABI
499 };
500
501 typedef struct RcOverride{
502 int start_frame;
503 int end_frame;
504 int qscale; // If this is 0 then quality_factor will be used instead.
505 float quality_factor;
506 } RcOverride;
507
508 #define FF_MAX_B_FRAMES 16
509
510 /* encoding support
511 These flags can be passed in AVCodecContext.flags before initialization.
512 Note: Not everything is supported yet.
513 */
514
515 #define CODEC_FLAG_QSCALE 0x0002 ///< Use fixed qscale.
516 #define CODEC_FLAG_4MV 0x0004 ///< 4 MV per MB allowed / advanced prediction for H.263.
517 #define CODEC_FLAG_QPEL 0x0010 ///< Use qpel MC.
518 #define CODEC_FLAG_GMC 0x0020 ///< Use GMC.
519 #define CODEC_FLAG_MV0 0x0040 ///< Always try a MB with MV=<0,0>.
520 #define CODEC_FLAG_PART 0x0080 ///< Use data partitioning.
521 /**
522 * The parent program guarantees that the input for B-frames containing
523 * streams is not written to for at least s->max_b_frames+1 frames, if
524 * this is not set the input will be copied.
525 */
526 #define CODEC_FLAG_INPUT_PRESERVED 0x0100
527 #define CODEC_FLAG_PASS1 0x0200 ///< Use internal 2pass ratecontrol in first pass mode.
528 #define CODEC_FLAG_PASS2 0x0400 ///< Use internal 2pass ratecontrol in second pass mode.
529 #define CODEC_FLAG_EXTERN_HUFF 0x1000 ///< Use external Huffman table (for MJPEG).
530 #define CODEC_FLAG_GRAY 0x2000 ///< Only decode/encode grayscale.
531 #define CODEC_FLAG_EMU_EDGE 0x4000 ///< Don't draw edges.
532 #define CODEC_FLAG_PSNR 0x8000 ///< error[?] variables will be set during encoding.
533 #define CODEC_FLAG_TRUNCATED 0x00010000 /** Input bitstream might be truncated at a random
534 location instead of only at frame boundaries. */
535 #define CODEC_FLAG_NORMALIZE_AQP 0x00020000 ///< Normalize adaptive quantization.
536 #define CODEC_FLAG_INTERLACED_DCT 0x00040000 ///< Use interlaced DCT.
537 #define CODEC_FLAG_LOW_DELAY 0x00080000 ///< Force low delay.
538 #define CODEC_FLAG_ALT_SCAN 0x00100000 ///< Use alternate scan.
539 #define CODEC_FLAG_GLOBAL_HEADER 0x00400000 ///< Place global headers in extradata instead of every keyframe.
540 #define CODEC_FLAG_BITEXACT 0x00800000 ///< Use only bitexact stuff (except (I)DCT).
541 /* Fx : Flag for h263+ extra options */
542 #define CODEC_FLAG_AC_PRED 0x01000000 ///< H.263 advanced intra coding / MPEG-4 AC prediction
543 #define CODEC_FLAG_H263P_UMV 0x02000000 ///< unlimited motion vector
544 #define CODEC_FLAG_CBP_RD 0x04000000 ///< Use rate distortion optimization for cbp.
545 #define CODEC_FLAG_QP_RD 0x08000000 ///< Use rate distortion optimization for qp selectioon.
546 #define CODEC_FLAG_H263P_AIV 0x00000008 ///< H.263 alternative inter VLC
547 #define CODEC_FLAG_OBMC 0x00000001 ///< OBMC
548 #define CODEC_FLAG_LOOP_FILTER 0x00000800 ///< loop filter
549 #define CODEC_FLAG_H263P_SLICE_STRUCT 0x10000000
550 #define CODEC_FLAG_INTERLACED_ME 0x20000000 ///< interlaced motion estimation
551 #define CODEC_FLAG_SVCD_SCAN_OFFSET 0x40000000 ///< Will reserve space for SVCD scan offset user data.
552 #define CODEC_FLAG_CLOSED_GOP 0x80000000
553 #define CODEC_FLAG2_FAST 0x00000001 ///< Allow non spec compliant speedup tricks.
554 #define CODEC_FLAG2_STRICT_GOP 0x00000002 ///< Strictly enforce GOP size.
555 #define CODEC_FLAG2_NO_OUTPUT 0x00000004 ///< Skip bitstream encoding.
556 #define CODEC_FLAG2_LOCAL_HEADER 0x00000008 ///< Place global headers at every keyframe instead of in extradata.
557 #define CODEC_FLAG2_BPYRAMID 0x00000010 ///< H.264 allow B-frames to be used as references.
558 #define CODEC_FLAG2_WPRED 0x00000020 ///< H.264 weighted biprediction for B-frames
559 #define CODEC_FLAG2_MIXED_REFS 0x00000040 ///< H.264 one reference per partition, as opposed to one reference per macroblock
560 #define CODEC_FLAG2_8X8DCT 0x00000080 ///< H.264 high profile 8x8 transform
561 #define CODEC_FLAG2_FASTPSKIP 0x00000100 ///< H.264 fast pskip
562 #define CODEC_FLAG2_AUD 0x00000200 ///< H.264 access unit delimiters
563 #define CODEC_FLAG2_BRDO 0x00000400 ///< B-frame rate-distortion optimization
564 #define CODEC_FLAG2_INTRA_VLC 0x00000800 ///< Use MPEG-2 intra VLC table.
565 #define CODEC_FLAG2_MEMC_ONLY 0x00001000 ///< Only do ME/MC (I frames -> ref, P frame -> ME+MC).
566 #define CODEC_FLAG2_DROP_FRAME_TIMECODE 0x00002000 ///< timecode is in drop frame format.
567 #define CODEC_FLAG2_SKIP_RD 0x00004000 ///< RD optimal MB level residual skipping
568 #define CODEC_FLAG2_CHUNKS 0x00008000 ///< Input bitstream might be truncated at a packet boundaries instead of only at frame boundaries.
569 #define CODEC_FLAG2_NON_LINEAR_QUANT 0x00010000 ///< Use MPEG-2 nonlinear quantizer.
570 #define CODEC_FLAG2_BIT_RESERVOIR 0x00020000 ///< Use a bit reservoir when encoding if possible
571
572 /* Unsupported options :
573 * Syntax Arithmetic coding (SAC)
574 * Reference Picture Selection
575 * Independent Segment Decoding */
576 /* /Fx */
577 /* codec capabilities */
578
579 #define CODEC_CAP_DRAW_HORIZ_BAND 0x0001 ///< Decoder can use draw_horiz_band callback.
580 /**
581 * Codec uses get_buffer() for allocating buffers.
582 * direct rendering method 1
583 */
584 #define CODEC_CAP_DR1 0x0002
585 /* If 'parse_only' field is true, then avcodec_parse_frame() can be used. */
586 #define CODEC_CAP_PARSE_ONLY 0x0004
587 #define CODEC_CAP_TRUNCATED 0x0008
588 /* Codec can export data for HW decoding (XvMC). */
589 #define CODEC_CAP_HWACCEL 0x0010
590 /**
591 * Codec has a nonzero delay and needs to be fed with NULL at the end to get the delayed data.
592 * If this is not set, the codec is guaranteed to never be fed with NULL data.
593 */
594 #define CODEC_CAP_DELAY 0x0020
595 /**
596 * Codec can be fed a final frame with a smaller size.
597 * This can be used to prevent truncation of the last audio samples.
598 */
599 #define CODEC_CAP_SMALL_LAST_FRAME 0x0040
600 /**
601 * Codec can export data for HW decoding (VDPAU).
602 */
603 #define CODEC_CAP_HWACCEL_VDPAU 0x0080
604
605 //The following defines may change, don't expect compatibility if you use them.
606 #define MB_TYPE_INTRA4x4 0x0001
607 #define MB_TYPE_INTRA16x16 0x0002 //FIXME H.264-specific
608 #define MB_TYPE_INTRA_PCM 0x0004 //FIXME H.264-specific
609 #define MB_TYPE_16x16 0x0008
610 #define MB_TYPE_16x8 0x0010
611 #define MB_TYPE_8x16 0x0020
612 #define MB_TYPE_8x8 0x0040
613 #define MB_TYPE_INTERLACED 0x0080
614 #define MB_TYPE_DIRECT2 0x0100 //FIXME
615 #define MB_TYPE_ACPRED 0x0200
616 #define MB_TYPE_GMC 0x0400
617 #define MB_TYPE_SKIP 0x0800
618 #define MB_TYPE_P0L0 0x1000
619 #define MB_TYPE_P1L0 0x2000
620 #define MB_TYPE_P0L1 0x4000
621 #define MB_TYPE_P1L1 0x8000
622 #define MB_TYPE_L0 (MB_TYPE_P0L0 | MB_TYPE_P1L0)
623 #define MB_TYPE_L1 (MB_TYPE_P0L1 | MB_TYPE_P1L1)
624 #define MB_TYPE_L0L1 (MB_TYPE_L0 | MB_TYPE_L1)
625 #define MB_TYPE_QUANT 0x00010000
626 #define MB_TYPE_CBP 0x00020000
627 //Note bits 24-31 are reserved for codec specific use (h264 ref0, mpeg1 0mv, ...)
628
629 /**
630 * Pan Scan area.
631 * This specifies the area which should be displayed.
632 * Note there may be multiple such areas for one frame.
633 */
634 typedef struct AVPanScan{
635 /**
636 * id
637 * - encoding: Set by user.
638 * - decoding: Set by libavcodec.
639 */
640 int id;
641
642 /**
643 * width and height in 1/16 pel
644 * - encoding: Set by user.
645 * - decoding: Set by libavcodec.
646 */
647 int width;
648 int height;
649
650 /**
651 * position of the top left corner in 1/16 pel for up to 3 fields/frames
652 * - encoding: Set by user.
653 * - decoding: Set by libavcodec.
654 */
655 int16_t position[3][2];
656 }AVPanScan;
657
658 #define FF_COMMON_FRAME \
659 /**\
660 * pointer to the picture planes.\
661 * This might be different from the first allocated byte\
662 * - encoding: \
663 * - decoding: \
664 */\
665 uint8_t *data[4];\
666 int linesize[4];\
667 /**\
668 * pointer to the first allocated byte of the picture. Can be used in get_buffer/release_buffer.\
669 * This isn't used by libavcodec unless the default get/release_buffer() is used.\
670 * - encoding: \
671 * - decoding: \
672 */\
673 uint8_t *base[4];\
674 /**\
675 * 1 -> keyframe, 0-> not\
676 * - encoding: Set by libavcodec.\
677 * - decoding: Set by libavcodec.\
678 */\
679 int key_frame;\
680 \
681 /**\
682 * Picture type of the frame, see ?_TYPE below.\
683 * - encoding: Set by libavcodec. for coded_picture (and set by user for input).\
684 * - decoding: Set by libavcodec.\
685 */\
686 int pict_type;\
687 \
688 /**\
689 * presentation timestamp in time_base units (time when frame should be shown to user)\
690 * If AV_NOPTS_VALUE then frame_rate = 1/time_base will be assumed.\
691 * - encoding: MUST be set by user.\
692 * - decoding: Set by libavcodec.\
693 */\
694 int64_t pts;\
695 \
696 /**\
697 * picture number in bitstream order\
698 * - encoding: set by\
699 * - decoding: Set by libavcodec.\
700 */\
701 int coded_picture_number;\
702 /**\
703 * picture number in display order\
704 * - encoding: set by\
705 * - decoding: Set by libavcodec.\
706 */\
707 int display_picture_number;\
708 \
709 /**\
710 * quality (between 1 (good) and FF_LAMBDA_MAX (bad)) \
711 * - encoding: Set by libavcodec. for coded_picture (and set by user for input).\
712 * - decoding: Set by libavcodec.\
713 */\
714 int quality; \
715 \
716 /**\
717 * buffer age (1->was last buffer and dint change, 2->..., ...).\
718 * Set to INT_MAX if the buffer has not been used yet.\
719 * - encoding: unused\
720 * - decoding: MUST be set by get_buffer().\
721 */\
722 int age;\
723 \
724 /**\
725 * is this picture used as reference\
726 * The values for this are the same as the MpegEncContext.picture_structure\
727 * variable, that is 1->top field, 2->bottom field, 3->frame/both fields.\
728 * Set to 4 for delayed, non-reference frames.\
729 * - encoding: unused\
730 * - decoding: Set by libavcodec. (before get_buffer() call)).\
731 */\
732 int reference;\
733 \
734 /**\
735 * QP table\
736 * - encoding: unused\
737 * - decoding: Set by libavcodec.\
738 */\
739 int8_t *qscale_table;\
740 /**\
741 * QP store stride\
742 * - encoding: unused\
743 * - decoding: Set by libavcodec.\
744 */\
745 int qstride;\
746 \
747 /**\
748 * mbskip_table[mb]>=1 if MB didn't change\
749 * stride= mb_width = (width+15)>>4\
750 * - encoding: unused\
751 * - decoding: Set by libavcodec.\
752 */\
753 uint8_t *mbskip_table;\
754 \
755 /**\
756 * motion vector table\
757 * @code\
758 * example:\
759 * int mv_sample_log2= 4 - motion_subsample_log2;\
760 * int mb_width= (width+15)>>4;\
761 * int mv_stride= (mb_width << mv_sample_log2) + 1;\
762 * motion_val[direction][x + y*mv_stride][0->mv_x, 1->mv_y];\
763 * @endcode\
764 * - encoding: Set by user.\
765 * - decoding: Set by libavcodec.\
766 */\
767 int16_t (*motion_val[2])[2];\
768 \
769 /**\
770 * macroblock type table\
771 * mb_type_base + mb_width + 2\
772 * - encoding: Set by user.\
773 * - decoding: Set by libavcodec.\
774 */\
775 uint32_t *mb_type;\
776 \
777 /**\
778 * log2 of the size of the block which a single vector in motion_val represents: \
779 * (4->16x16, 3->8x8, 2-> 4x4, 1-> 2x2)\
780 * - encoding: unused\
781 * - decoding: Set by libavcodec.\
782 */\
783 uint8_t motion_subsample_log2;\
784 \
785 /**\
786 * for some private data of the user\
787 * - encoding: unused\
788 * - decoding: Set by user.\
789 */\
790 void *opaque;\
791 \
792 /**\
793 * error\
794 * - encoding: Set by libavcodec. if flags&CODEC_FLAG_PSNR.\
795 * - decoding: unused\
796 */\
797 uint64_t error[4];\
798 \
799 /**\
800 * type of the buffer (to keep track of who has to deallocate data[*])\
801 * - encoding: Set by the one who allocates it.\
802 * - decoding: Set by the one who allocates it.\
803 * Note: User allocated (direct rendering) & internal buffers cannot coexist currently.\
804 */\
805 int type;\
806 \
807 /**\
808 * When decoding, this signals how much the picture must be delayed.\
809 * extra_delay = repeat_pict / (2*fps)\
810 * - encoding: unused\
811 * - decoding: Set by libavcodec.\
812 */\
813 int repeat_pict;\
814 \
815 /**\
816 * \
817 */\
818 int qscale_type;\
819 \
820 /**\
821 * The content of the picture is interlaced.\
822 * - encoding: Set by user.\
823 * - decoding: Set by libavcodec. (default 0)\
824 */\
825 int interlaced_frame;\
826 \
827 /**\
828 * If the content is interlaced, is top field displayed first.\
829 * - encoding: Set by user.\
830 * - decoding: Set by libavcodec.\
831 */\
832 int top_field_first;\
833 \
834 /**\
835 * Pan scan.\
836 * - encoding: Set by user.\
837 * - decoding: Set by libavcodec.\
838 */\
839 AVPanScan *pan_scan;\
840 \
841 /**\
842 * Tell user application that palette has changed from previous frame.\
843 * - encoding: ??? (no palette-enabled encoder yet)\
844 * - decoding: Set by libavcodec. (default 0).\
845 */\
846 int palette_has_changed;\
847 \
848 /**\
849 * codec suggestion on buffer type if != 0\
850 * - encoding: unused\
851 * - decoding: Set by libavcodec. (before get_buffer() call)).\
852 */\
853 int buffer_hints;\
854 \
855 /**\
856 * DCT coefficients\
857 * - encoding: unused\
858 * - decoding: Set by libavcodec.\
859 */\
860 short *dct_coeff;\
861 \
862 /**\
863 * motion referece frame index\
864 * - encoding: Set by user.\
865 * - decoding: Set by libavcodec.\
866 */\
867 int8_t *ref_index[2];\
868 \
869 /**\
870 * reordered opaque 64bit number (generally a PTS) from AVCodecContext.reordered_opaque\
871 * output in AVFrame.reordered_opaque\
872 * - encoding: unused\
873 * - decoding: Read by user.\
874 */\
875 int64_t reordered_opaque;\
876 \
877 /**\
878 * hardware accelerator private data (FFmpeg allocated)\
879 * - encoding: unused\
880 * - decoding: Set by libavcodec\
881 */\
882 void *hwaccel_picture_private;\
883
884
885 #define FF_QSCALE_TYPE_MPEG1 0
886 #define FF_QSCALE_TYPE_MPEG2 1
887 #define FF_QSCALE_TYPE_H264 2
888
889 #define FF_BUFFER_TYPE_INTERNAL 1
890 #define FF_BUFFER_TYPE_USER 2 ///< direct rendering buffers (image is (de)allocated by user)
891 #define FF_BUFFER_TYPE_SHARED 4 ///< Buffer from somewhere else; don't deallocate image (data/base), all other tables are not shared.
892 #define FF_BUFFER_TYPE_COPY 8 ///< Just a (modified) copy of some other buffer, don't deallocate anything.
893
894
895 #define FF_I_TYPE 1 ///< Intra
896 #define FF_P_TYPE 2 ///< Predicted
897 #define FF_B_TYPE 3 ///< Bi-dir predicted
898 #define FF_S_TYPE 4 ///< S(GMC)-VOP MPEG4
899 #define FF_SI_TYPE 5 ///< Switching Intra
900 #define FF_SP_TYPE 6 ///< Switching Predicted
901 #define FF_BI_TYPE 7
902
903 #define FF_BUFFER_HINTS_VALID 0x01 // Buffer hints value is meaningful (if 0 ignore).
904 #define FF_BUFFER_HINTS_READABLE 0x02 // Codec will read from buffer.
905 #define FF_BUFFER_HINTS_PRESERVE 0x04 // User must not alter buffer content.
906 #define FF_BUFFER_HINTS_REUSABLE 0x08 // Codec will reuse the buffer (update).
907
908 typedef struct AVPacket {
909 /**
910 * Presentation timestamp in AVStream->time_base units; the time at which
911 * the decompressed packet will be presented to the user.
912 * Can be AV_NOPTS_VALUE if it is not stored in the file.
913 * pts MUST be larger or equal to dts as presentation cannot happen before
914 * decompression, unless one wants to view hex dumps. Some formats misuse
915 * the terms dts and pts/cts to mean something different. Such timestamps
916 * must be converted to true pts/dts before they are stored in AVPacket.
917 */
918 int64_t pts;
919 /**
920 * Decompression timestamp in AVStream->time_base units; the time at which
921 * the packet is decompressed.
922 * Can be AV_NOPTS_VALUE if it is not stored in the file.
923 */
924 int64_t dts;
925 uint8_t *data;
926 int size;
927 int stream_index;
928 int flags;
929 /**
930 * Duration of this packet in AVStream->time_base units, 0 if unknown.
931 * Equals next_pts - this_pts in presentation order.
932 */
933 int duration;
934 void (*destruct)(struct AVPacket *);
935 void *priv;
936 int64_t pos; ///< byte position in stream, -1 if unknown
937
938 /**
939 * Time difference in AVStream->time_base units from the pts of this
940 * packet to the point at which the output from the decoder has converged
941 * independent from the availability of previous frames. That is, the
942 * frames are virtually identical no matter if decoding started from
943 * the very first frame or from this keyframe.
944 * Is AV_NOPTS_VALUE if unknown.
945 * This field is not the display duration of the current packet.
946 *
947 * The purpose of this field is to allow seeking in streams that have no
948 * keyframes in the conventional sense. It corresponds to the
949 * recovery point SEI in H.264 and match_time_delta in NUT. It is also
950 * essential for some types of subtitle streams to ensure that all
951 * subtitles are correctly displayed after seeking.
952 */
953 int64_t convergence_duration;
954 } AVPacket;
955 #define AV_PKT_FLAG_KEY 0x0001
956 #if LIBAVCODEC_VERSION_MAJOR < 53
957 #define PKT_FLAG_KEY AV_PKT_FLAG_KEY
958 #endif
959
960 /**
961 * Audio Video Frame.
962 * New fields can be added to the end of FF_COMMON_FRAME with minor version
963 * bumps.
964 * Removal, reordering and changes to existing fields require a major
965 * version bump. No fields should be added into AVFrame before or after
966 * FF_COMMON_FRAME!
967 * sizeof(AVFrame) must not be used outside libav*.
968 */
969 typedef struct AVFrame {
970 FF_COMMON_FRAME
971 } AVFrame;
972
973 /**
974 * main external API structure.
975 * New fields can be added to the end with minor version bumps.
976 * Removal, reordering and changes to existing fields require a major
977 * version bump.
978 * sizeof(AVCodecContext) must not be used outside libav*.
979 */
980 typedef struct AVCodecContext {
981 /**
982 * information on struct for av_log
983 * - set by avcodec_alloc_context
984 */
985 const AVClass *av_class;
986 /**
987 * the average bitrate
988 * - encoding: Set by user; unused for constant quantizer encoding.
989 * - decoding: Set by libavcodec. 0 or some bitrate if this info is available in the stream.
990 */
991 int bit_rate;
992
993 /**
994 * number of bits the bitstream is allowed to diverge from the reference.
995 * the reference can be CBR (for CBR pass1) or VBR (for pass2)
996 * - encoding: Set by user; unused for constant quantizer encoding.
997 * - decoding: unused
998 */
999 int bit_rate_tolerance;
1000
1001 /**
1002 * CODEC_FLAG_*.
1003 * - encoding: Set by user.
1004 * - decoding: Set by user.
1005 */
1006 int flags;
1007
1008 /**
1009 * Some codecs need additional format info. It is stored here.
1010 * If any muxer uses this then ALL demuxers/parsers AND encoders for the
1011 * specific codec MUST set it correctly otherwise stream copy breaks.
1012 * In general use of this field by muxers is not recommanded.
1013 * - encoding: Set by libavcodec.
1014 * - decoding: Set by libavcodec. (FIXME: Is this OK?)
1015 */
1016 int sub_id;
1017
1018 /**
1019 * Motion estimation algorithm used for video coding.
1020 * 1 (zero), 2 (full), 3 (log), 4 (phods), 5 (epzs), 6 (x1), 7 (hex),
1021 * 8 (umh), 9 (iter), 10 (tesa) [7, 8, 10 are x264 specific, 9 is snow specific]
1022 * - encoding: MUST be set by user.
1023 * - decoding: unused
1024 */
1025 int me_method;
1026
1027 /**
1028 * some codecs need / can use extradata like Huffman tables.
1029 * mjpeg: Huffman tables
1030 * rv10: additional flags
1031 * mpeg4: global headers (they can be in the bitstream or here)
1032 * The allocated memory should be FF_INPUT_BUFFER_PADDING_SIZE bytes larger
1033 * than extradata_size to avoid prolems if it is read with the bitstream reader.
1034 * The bytewise contents of extradata must not depend on the architecture or CPU endianness.
1035 * - encoding: Set/allocated/freed by libavcodec.
1036 * - decoding: Set/allocated/freed by user.
1037 */
1038 uint8_t *extradata;
1039 int extradata_size;
1040
1041 /**
1042 * This is the fundamental unit of time (in seconds) in terms
1043 * of which frame timestamps are represented. For fixed-fps content,
1044 * timebase should be 1/framerate and timestamp increments should be
1045 * identically 1.
1046 * - encoding: MUST be set by user.
1047 * - decoding: Set by libavcodec.
1048 */
1049 AVRational time_base;
1050
1051 /* video only */
1052 /**
1053 * picture width / height.
1054 * - encoding: MUST be set by user.
1055 * - decoding: Set by libavcodec.
1056 * Note: For compatibility it is possible to set this instead of
1057 * coded_width/height before decoding.
1058 */
1059 int width, height;
1060
1061 #define FF_ASPECT_EXTENDED 15
1062
1063 /**
1064 * the number of pictures in a group of pictures, or 0 for intra_only
1065 * - encoding: Set by user.
1066 * - decoding: unused
1067 */
1068 int gop_size;
1069
1070 /**
1071 * Pixel format, see PIX_FMT_xxx.
1072 * - encoding: Set by user.
1073 * - decoding: Set by libavcodec.
1074 */
1075 enum PixelFormat pix_fmt;
1076
1077 /**
1078 * Frame rate emulation. If not zero, the lower layer (i.e. format handler)
1079 * has to read frames at native frame rate.
1080 * - encoding: Set by user.
1081 * - decoding: unused
1082 */
1083 int rate_emu;
1084
1085 /**
1086 * If non NULL, 'draw_horiz_band' is called by the libavcodec
1087 * decoder to draw a horizontal band. It improves cache usage. Not
1088 * all codecs can do that. You must check the codec capabilities
1089 * beforehand.
1090 * The function is also used by hardware acceleration APIs.
1091 * It is called at least once during frame decoding to pass
1092 * the data needed for hardware render.
1093 * In that mode instead of pixel data, AVFrame points to
1094 * a structure specific to the acceleration API. The application
1095 * reads the structure and can change some fields to indicate progress
1096 * or mark state.
1097 * - encoding: unused
1098 * - decoding: Set by user.
1099 * @param height the height of the slice
1100 * @param y the y position of the slice
1101 * @param type 1->top field, 2->bottom field, 3->frame
1102 * @param offset offset into the AVFrame.data from which the slice should be read
1103 */
1104 void (*draw_horiz_band)(struct AVCodecContext *s,
1105 const AVFrame *src, int offset[4],
1106 int y, int type, int height);
1107
1108 /* audio only */
1109 int sample_rate; ///< samples per second
1110 int channels; ///< number of audio channels
1111
1112 /**
1113 * audio sample format
1114 * - encoding: Set by user.
1115 * - decoding: Set by libavcodec.
1116 */
1117 enum SampleFormat sample_fmt; ///< sample format
1118
1119 /* The following data should not be initialized. */
1120 /**
1121 * Samples per packet, initialized when calling 'init'.
1122 */
1123 int frame_size;
1124 int frame_number; ///< audio or video frame number
1125 #if LIBAVCODEC_VERSION_MAJOR < 53
1126 int real_pict_num; ///< Returns the real picture number of previous encoded frame.
1127 #endif
1128
1129 /**
1130 * Number of frames the decoded output will be delayed relative to
1131 * the encoded input.
1132 * - encoding: Set by libavcodec.
1133 * - decoding: unused
1134 */
1135 int delay;
1136
1137 /* - encoding parameters */
1138 float qcompress; ///< amount of qscale change between easy & hard scenes (0.0-1.0)
1139 float qblur; ///< amount of qscale smoothing over time (0.0-1.0)
1140
1141 /**
1142 * minimum quantizer
1143 * - encoding: Set by user.
1144 * - decoding: unused
1145 */
1146 int qmin;
1147
1148 /**
1149 * maximum quantizer
1150 * - encoding: Set by user.
1151 * - decoding: unused
1152 */
1153 int qmax;
1154
1155 /**
1156 * maximum quantizer difference between frames
1157 * - encoding: Set by user.
1158 * - decoding: unused
1159 */
1160 int max_qdiff;
1161
1162 /**
1163 * maximum number of B-frames between non-B-frames
1164 * Note: The output will be delayed by max_b_frames+1 relative to the input.
1165 * - encoding: Set by user.
1166 * - decoding: unused
1167 */
1168 int max_b_frames;
1169
1170 /**
1171 * qscale factor between IP and B-frames
1172 * If > 0 then the last P-frame quantizer will be used (q= lastp_q*factor+offset).
1173 * If < 0 then normal ratecontrol will be done (q= -normal_q*factor+offset).
1174 * - encoding: Set by user.
1175 * - decoding: unused
1176 */
1177 float b_quant_factor;
1178
1179 /** obsolete FIXME remove */
1180 int rc_strategy;
1181 #define FF_RC_STRATEGY_XVID 1
1182
1183 int b_frame_strategy;
1184
1185 /**
1186 * hurry up amount
1187 * - encoding: unused
1188 * - decoding: Set by user. 1-> Skip B-frames, 2-> Skip IDCT/dequant too, 5-> Skip everything except header
1189 * @deprecated Deprecated in favor of skip_idct and skip_frame.
1190 */
1191 int hurry_up;
1192
1193 struct AVCodec *codec;
1194
1195 void *priv_data;
1196
1197 int rtp_payload_size; /* The size of the RTP payload: the coder will */
1198 /* do its best to deliver a chunk with size */
1199 /* below rtp_payload_size, the chunk will start */
1200 /* with a start code on some codecs like H.263. */
1201 /* This doesn't take account of any particular */
1202 /* headers inside the transmitted RTP payload. */
1203
1204
1205 /* The RTP callback: This function is called */
1206 /* every time the encoder has a packet to send. */
1207 /* It depends on the encoder if the data starts */
1208 /* with a Start Code (it should). H.263 does. */
1209 /* mb_nb contains the number of macroblocks */
1210 /* encoded in the RTP payload. */
1211 void (*rtp_callback)(struct AVCodecContext *avctx, void *data, int size, int mb_nb);
1212
1213 /* statistics, used for 2-pass encoding */
1214 int mv_bits;
1215 int header_bits;
1216 int i_tex_bits;
1217 int p_tex_bits;
1218 int i_count;
1219 int p_count;
1220 int skip_count;
1221 int misc_bits;
1222
1223 /**
1224 * number of bits used for the previously encoded frame
1225 * - encoding: Set by libavcodec.
1226 * - decoding: unused
1227 */
1228 int frame_bits;
1229
1230 /**
1231 * Private data of the user, can be used to carry app specific stuff.
1232 * - encoding: Set by user.
1233 * - decoding: Set by user.
1234 */
1235 void *opaque;
1236
1237 char codec_name[32];
1238 enum CodecType codec_type; /* see CODEC_TYPE_xxx */
1239 enum CodecID codec_id; /* see CODEC_ID_xxx */
1240
1241 /**
1242 * fourcc (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A').
1243 * This is used to work around some encoder bugs.
1244 * A demuxer should set this to what is stored in the field used to identify the codec.
1245 * If there are multiple such fields in a container then the demuxer should choose the one
1246 * which maximizes the information about the used codec.
1247 * If the codec tag field in a container is larger then 32 bits then the demuxer should
1248 * remap the longer ID to 32 bits with a table or other structure. Alternatively a new
1249 * extra_codec_tag + size could be added but for this a clear advantage must be demonstrated
1250 * first.
1251 * - encoding: Set by user, if not then the default based on codec_id will be used.
1252 * - decoding: Set by user, will be converted to uppercase by libavcodec during init.
1253 */
1254 unsigned int codec_tag;
1255
1256 /**
1257 * Work around bugs in encoders which sometimes cannot be detected automatically.
1258 * - encoding: Set by user
1259 * - decoding: Set by user
1260 */
1261 int workaround_bugs;
1262 #define FF_BUG_AUTODETECT 1 ///< autodetection
1263 #define FF_BUG_OLD_MSMPEG4 2
1264 #define FF_BUG_XVID_ILACE 4
1265 #define FF_BUG_UMP4 8
1266 #define FF_BUG_NO_PADDING 16
1267 #define FF_BUG_AMV 32
1268 #define FF_BUG_AC_VLC 0 ///< Will be removed, libavcodec can now handle these non-compliant files by default.
1269 #define FF_BUG_QPEL_CHROMA 64
1270 #define FF_BUG_STD_QPEL 128
1271 #define FF_BUG_QPEL_CHROMA2 256
1272 #define FF_BUG_DIRECT_BLOCKSIZE 512
1273 #define FF_BUG_EDGE 1024
1274 #define FF_BUG_HPEL_CHROMA 2048
1275 #define FF_BUG_DC_CLIP 4096
1276 #define FF_BUG_MS 8192 ///< Work around various bugs in Microsoft's broken decoders.
1277 //#define FF_BUG_FAKE_SCALABILITY 16 //Autodetection should work 100%.
1278
1279 /**
1280 * luma single coefficient elimination threshold
1281 * - encoding: Set by user.
1282 * - decoding: unused
1283 */
1284 int luma_elim_threshold;
1285
1286 /**
1287 * chroma single coeff elimination threshold
1288 * - encoding: Set by user.
1289 * - decoding: unused
1290 */
1291 int chroma_elim_threshold;
1292
1293 /**
1294 * strictly follow the standard (MPEG4, ...).
1295 * - encoding: Set by user.
1296 * - decoding: Set by user.
1297 * Setting this to STRICT or higher means the encoder and decoder will
1298 * generally do stupid things. While setting it to inofficial or lower
1299 * will mean the encoder might use things that are not supported by all
1300 * spec compliant decoders. Decoders make no difference between normal,
1301 * inofficial and experimental, that is they always try to decode things
1302 * when they can unless they are explicitly asked to behave stupid
1303 * (=strictly conform to the specs)
1304 */
1305 int strict_std_compliance;
1306 #define FF_COMPLIANCE_VERY_STRICT 2 ///< Strictly conform to a older more strict version of the spec or reference software.
1307 #define FF_COMPLIANCE_STRICT 1 ///< Strictly conform to all the things in the spec no matter what consequences.
1308 #define FF_COMPLIANCE_NORMAL 0
1309 #define FF_COMPLIANCE_INOFFICIAL -1 ///< Allow inofficial extensions.
1310 #define FF_COMPLIANCE_EXPERIMENTAL -2 ///< Allow nonstandardized experimental things.
1311
1312 /**
1313 * qscale offset between IP and B-frames
1314 * - encoding: Set by user.
1315 * - decoding: unused
1316 */
1317 float b_quant_offset;
1318
1319 /**
1320 * Error recognization; higher values will detect more errors but may
1321 * misdetect some more or less valid parts as errors.
1322 * - encoding: unused
1323 * - decoding: Set by user.
1324 */
1325 int error_recognition;
1326 #define FF_ER_CAREFUL 1
1327 #define FF_ER_COMPLIANT 2
1328 #define FF_ER_AGGRESSIVE 3
1329 #define FF_ER_VERY_AGGRESSIVE 4
1330
1331 /**
1332 * Called at the beginning of each frame to get a buffer for it.
1333 * If pic.reference is set then the frame will be read later by libavcodec.
1334 * avcodec_align_dimensions() should be used to find the required width and
1335 * height, as they normally need to be rounded up to the next multiple of 16.
1336 * if CODEC_CAP_DR1 is not set then get_buffer() must call
1337 * avcodec_default_get_buffer() instead of providing buffers allocated by
1338 * some other means.
1339 * - encoding: unused
1340 * - decoding: Set by libavcodec., user can override.
1341 */
1342 int (*get_buffer)(struct AVCodecContext *c, AVFrame *pic);
1343
1344 /**
1345 * Called to release buffers which were allocated with get_buffer.
1346 * A released buffer can be reused in get_buffer().
1347 * pic.data[*] must be set to NULL.
1348 * - encoding: unused
1349 * - decoding: Set by libavcodec., user can override.
1350 */
1351 void (*release_buffer)(struct AVCodecContext *c, AVFrame *pic);
1352
1353 /**
1354 * Size of the frame reordering buffer in the decoder.
1355 * For MPEG-2 it is 1 IPB or 0 low delay IP.
1356 * - encoding: Set by libavcodec.
1357 * - decoding: Set by libavcodec.
1358 */
1359 int has_b_frames;
1360
1361 /**
1362 * number of bytes per packet if constant and known or 0
1363 * Used by some WAV based audio codecs.
1364 */
1365 int block_align;
1366
1367 int parse_only; /* - decoding only: If true, only parsing is done
1368 (function avcodec_parse_frame()). The frame
1369 data is returned. Only MPEG codecs support this now. */
1370
1371 /**
1372 * 0-> h263 quant 1-> mpeg quant
1373 * - encoding: Set by user.
1374 * - decoding: unused
1375 */
1376 int mpeg_quant;
1377
1378 /**
1379 * pass1 encoding statistics output buffer
1380 * - encoding: Set by libavcodec.
1381 * - decoding: unused
1382 */
1383 char *stats_out;
1384
1385 /**
1386 * pass2 encoding statistics input buffer
1387 * Concatenated stuff from stats_out of pass1 should be placed here.
1388 * - encoding: Allocated/set/freed by user.
1389 * - decoding: unused
1390 */
1391 char *stats_in;
1392
1393 /**
1394 * ratecontrol qmin qmax limiting method
1395 * 0-> clipping, 1-> use a nice continous function to limit qscale wthin qmin/qmax.
1396 * - encoding: Set by user.
1397 * - decoding: unused
1398 */
1399 float rc_qsquish;
1400
1401 float rc_qmod_amp;
1402 int rc_qmod_freq;
1403
1404 /**
1405 * ratecontrol override, see RcOverride
1406 * - encoding: Allocated/set/freed by user.
1407 * - decoding: unused
1408 */
1409 RcOverride *rc_override;
1410 int rc_override_count;
1411
1412 /**
1413 * rate control equation
1414 * - encoding: Set by user
1415 * - decoding: unused
1416 */
1417 const char *rc_eq;
1418
1419 /**
1420 * maximum bitrate
1421 * - encoding: Set by user.
1422 * - decoding: unused
1423 */
1424 int rc_max_rate;
1425
1426 /**
1427 * minimum bitrate
1428 * - encoding: Set by user.
1429 * - decoding: unused
1430 */
1431 int rc_min_rate;
1432
1433 /**
1434 * decoder bitstream buffer size
1435 * - encoding: Set by user.
1436 * - decoding: unused
1437 */
1438 int rc_buffer_size;
1439 float rc_buffer_aggressivity;
1440
1441 /**
1442 * qscale factor between P and I-frames
1443 * If > 0 then the last p frame quantizer will be used (q= lastp_q*factor+offset).
1444 * If < 0 then normal ratecontrol will be done (q= -normal_q*factor+offset).
1445 * - encoding: Set by user.
1446 * - decoding: unused
1447 */
1448 float i_quant_factor;
1449
1450 /**
1451 * qscale offset between P and I-frames
1452 * - encoding: Set by user.
1453 * - decoding: unused
1454 */
1455 float i_quant_offset;
1456
1457 /**
1458 * initial complexity for pass1 ratecontrol
1459 * - encoding: Set by user.
1460 * - decoding: unused
1461 */
1462 float rc_initial_cplx;
1463
1464 /**
1465 * DCT algorithm, see FF_DCT_* below
1466 * - encoding: Set by user.
1467 * - decoding: unused
1468 */
1469 int dct_algo;
1470 #define FF_DCT_AUTO 0
1471 #define FF_DCT_FASTINT 1
1472 #define FF_DCT_INT 2
1473 #define FF_DCT_MMX 3
1474 #define FF_DCT_MLIB 4
1475 #define FF_DCT_ALTIVEC 5
1476 #define FF_DCT_FAAN 6
1477
1478 /**
1479 * luminance masking (0-> disabled)
1480 * - encoding: Set by user.
1481 * - decoding: unused
1482 */
1483 float lumi_masking;
1484
1485 /**
1486 * temporary complexity masking (0-> disabled)
1487 * - encoding: Set by user.
1488 * - decoding: unused
1489 */
1490 float temporal_cplx_masking;
1491
1492 /**
1493 * spatial complexity masking (0-> disabled)
1494 * - encoding: Set by user.
1495 * - decoding: unused
1496 */
1497 float spatial_cplx_masking;
1498
1499 /**
1500 * p block masking (0-> disabled)
1501 * - encoding: Set by user.
1502 * - decoding: unused
1503 */
1504 float p_masking;
1505
1506 /**
1507 * darkness masking (0-> disabled)
1508 * - encoding: Set by user.
1509 * - decoding: unused
1510 */
1511 float dark_masking;
1512
1513 /**
1514 * IDCT algorithm, see FF_IDCT_* below.
1515 * - encoding: Set by user.
1516 * - decoding: Set by user.
1517 */
1518 int idct_algo;
1519 #define FF_IDCT_AUTO 0
1520 #define FF_IDCT_INT 1
1521 #define FF_IDCT_SIMPLE 2
1522 #define FF_IDCT_SIMPLEMMX 3
1523 #define FF_IDCT_LIBMPEG2MMX 4
1524 #define FF_IDCT_PS2 5
1525 #define FF_IDCT_MLIB 6
1526 #define FF_IDCT_ARM 7
1527 #define FF_IDCT_ALTIVEC 8
1528 #define FF_IDCT_SH4 9
1529 #define FF_IDCT_SIMPLEARM 10
1530 #define FF_IDCT_H264 11
1531 #define FF_IDCT_VP3 12
1532 #define FF_IDCT_IPP 13
1533 #define FF_IDCT_XVIDMMX 14
1534 #define FF_IDCT_CAVS 15
1535 #define FF_IDCT_SIMPLEARMV5TE 16
1536 #define FF_IDCT_SIMPLEARMV6 17
1537 #define FF_IDCT_SIMPLEVIS 18
1538 #define FF_IDCT_WMV2 19
1539 #define FF_IDCT_FAAN 20
1540 #define FF_IDCT_EA 21
1541 #define FF_IDCT_SIMPLENEON 22
1542 #define FF_IDCT_SIMPLEALPHA 23
1543
1544 /**
1545 * slice count
1546 * - encoding: Set by libavcodec.
1547 * - decoding: Set by user (or 0).
1548 */
1549 int slice_count;
1550 /**
1551 * slice offsets in the frame in bytes
1552 * - encoding: Set/allocated by libavcodec.
1553 * - decoding: Set/allocated by user (or NULL).
1554 */
1555 int *slice_offset;
1556
1557 /**
1558 * error concealment flags
1559 * - encoding: unused
1560 * - decoding: Set by user.
1561 */
1562 int error_concealment;
1563 #define FF_EC_GUESS_MVS 1
1564 #define FF_EC_DEBLOCK 2
1565
1566 /**
1567 * dsp_mask could be add used to disable unwanted CPU features
1568 * CPU features (i.e. MMX, SSE. ...)
1569 *
1570 * With the FORCE flag you may instead enable given CPU features.
1571 * (Dangerous: Usable in case of misdetection, improper usage however will
1572 * result into program crash.)
1573 */
1574 unsigned dsp_mask;
1575 #define FF_MM_FORCE 0x80000000 /* Force usage of selected flags (OR) */
1576 /* lower 16 bits - CPU features */
1577 #define FF_MM_MMX 0x0001 ///< standard MMX
1578 #define FF_MM_3DNOW 0x0004 ///< AMD 3DNOW
1579 #if LIBAVCODEC_VERSION_MAJOR < 53
1580 #define FF_MM_MMXEXT 0x0002 ///< SSE integer functions or AMD MMX ext
1581 #endif
1582 #define FF_MM_MMX2 0x0002 ///< SSE integer functions or AMD MMX ext
1583 #define FF_MM_SSE 0x0008 ///< SSE functions
1584 #define FF_MM_SSE2 0x0010 ///< PIV SSE2 functions
1585 #define FF_MM_3DNOWEXT 0x0020 ///< AMD 3DNowExt
1586 #define FF_MM_SSE3 0x0040 ///< Prescott SSE3 functions
1587 #define FF_MM_SSSE3 0x0080 ///< Conroe SSSE3 functions
1588 #define FF_MM_SSE4 0x0100 ///< Penryn SSE4.1 functions
1589 #define FF_MM_SSE42 0x0200 ///< Nehalem SSE4.2 functions
1590 #define FF_MM_IWMMXT 0x0100 ///< XScale IWMMXT
1591 #define FF_MM_ALTIVEC 0x0001 ///< standard AltiVec
1592
1593 /**
1594 * bits per sample/pixel from the demuxer (needed for huffyuv).
1595 * - encoding: Set by libavcodec.
1596 * - decoding: Set by user.
1597 */
1598 int bits_per_coded_sample;
1599
1600 /**
1601 * prediction method (needed for huffyuv)
1602 * - encoding: Set by user.
1603 * - decoding: unused
1604 */
1605 int prediction_method;
1606 #define FF_PRED_LEFT 0
1607 #define FF_PRED_PLANE 1
1608 #define FF_PRED_MEDIAN 2
1609
1610 /**
1611 * sample aspect ratio (0 if unknown)
1612 * That is the width of a pixel divided by the height of the pixel.
1613 * Numerator and denominator must be relatively prime and smaller than 256 for some video standards.
1614 * - encoding: Set by user.
1615 * - decoding: Set by libavcodec.
1616 */
1617 AVRational sample_aspect_ratio;
1618
1619 /**
1620 * the picture in the bitstream
1621 * - encoding: Set by libavcodec.
1622 * - decoding: Set by libavcodec.
1623 */
1624 AVFrame *coded_frame;
1625
1626 /**
1627 * debug
1628 * - encoding: Set by user.
1629 * - decoding: Set by user.
1630 */
1631 int debug;
1632 #define FF_DEBUG_PICT_INFO 1
1633 #define FF_DEBUG_RC 2
1634 #define FF_DEBUG_BITSTREAM 4
1635 #define FF_DEBUG_MB_TYPE 8
1636 #define FF_DEBUG_QP 16
1637 #define FF_DEBUG_MV 32
1638 #define FF_DEBUG_DCT_COEFF 0x00000040
1639 #define FF_DEBUG_SKIP 0x00000080
1640 #define FF_DEBUG_STARTCODE 0x00000100
1641 #define FF_DEBUG_PTS 0x00000200
1642 #define FF_DEBUG_ER 0x00000400
1643 #define FF_DEBUG_MMCO 0x00000800
1644 #define FF_DEBUG_BUGS 0x00001000
1645 #define FF_DEBUG_VIS_QP 0x00002000
1646 #define FF_DEBUG_VIS_MB_TYPE 0x00004000
1647 #define FF_DEBUG_BUFFERS 0x00008000
1648
1649 /**
1650 * debug
1651 * - encoding: Set by user.
1652 * - decoding: Set by user.
1653 */
1654 int debug_mv;
1655 #define FF_DEBUG_VIS_MV_P_FOR 0x00000001 //visualize forward predicted MVs of P frames
1656 #define FF_DEBUG_VIS_MV_B_FOR 0x00000002 //visualize forward predicted MVs of B frames
1657 #define FF_DEBUG_VIS_MV_B_BACK 0x00000004 //visualize backward predicted MVs of B frames
1658
1659 /**
1660 * error
1661 * - encoding: Set by libavcodec if flags&CODEC_FLAG_PSNR.
1662 * - decoding: unused
1663 */
1664 uint64_t error[4];
1665
1666 /**
1667 * minimum MB quantizer
1668 * - encoding: unused
1669 * - decoding: unused
1670 */
1671 int mb_qmin;
1672
1673 /**
1674 * maximum MB quantizer
1675 * - encoding: unused
1676 * - decoding: unused
1677 */
1678 int mb_qmax;
1679
1680 /**
1681 * motion estimation comparison function
1682 * - encoding: Set by user.
1683 * - decoding: unused
1684 */
1685 int me_cmp;
1686 /**
1687 * subpixel motion estimation comparison function
1688 * - encoding: Set by user.
1689 * - decoding: unused
1690 */
1691 int me_sub_cmp;
1692 /**
1693 * macroblock comparison function (not supported yet)
1694 * - encoding: Set by user.
1695 * - decoding: unused
1696 */
1697 int mb_cmp;
1698 /**
1699 * interlaced DCT comparison function
1700 * - encoding: Set by user.
1701 * - decoding: unused
1702 */
1703 int ildct_cmp;
1704 #define FF_CMP_SAD 0
1705 #define FF_CMP_SSE 1
1706 #define FF_CMP_SATD 2
1707 #define FF_CMP_DCT 3
1708 #define FF_CMP_PSNR 4
1709 #define FF_CMP_BIT 5
1710 #define FF_CMP_RD 6
1711 #define FF_CMP_ZERO 7
1712 #define FF_CMP_VSAD 8
1713 #define FF_CMP_VSSE 9
1714 #define FF_CMP_NSSE 10
1715 #define FF_CMP_W53 11
1716 #define FF_CMP_W97 12
1717 #define FF_CMP_DCTMAX 13
1718 #define FF_CMP_DCT264 14
1719 #define FF_CMP_CHROMA 256
1720
1721 /**
1722 * ME diamond size & shape
1723 * - encoding: Set by user.
1724 * - decoding: unused
1725 */
1726 int dia_size;
1727
1728 /**
1729 * amount of previous MV predictors (2a+1 x 2a+1 square)
1730 * - encoding: Set by user.
1731 * - decoding: unused
1732 */
1733 int last_predictor_count;
1734
1735 /**
1736 * prepass for motion estimation
1737 * - encoding: Set by user.
1738 * - decoding: unused
1739 */
1740 int pre_me;
1741
1742 /**
1743 * motion estimation prepass comparison function
1744 * - encoding: Set by user.
1745 * - decoding: unused
1746 */
1747 int me_pre_cmp;
1748
1749 /**
1750 * ME prepass diamond size & shape
1751 * - encoding: Set by user.
1752 * - decoding: unused
1753 */
1754 int pre_dia_size;
1755
1756 /**
1757 * subpel ME quality
1758 * - encoding: Set by user.
1759 * - decoding: unused
1760 */
1761 int me_subpel_quality;
1762
1763 /**
1764 * callback to negotiate the pixelFormat
1765 * @param fmt is the list of formats which are supported by the codec,
1766 * it is terminated by -1 as 0 is a valid format, the formats are ordered by quality.
1767 * The first is always the native one.
1768 * @return the chosen format
1769 * - encoding: unused
1770 * - decoding: Set by user, if not set the native format will be chosen.
1771 */
1772 enum PixelFormat (*get_format)(struct AVCodecContext *s, const enum PixelFormat * fmt);
1773
1774 /**
1775 * DTG active format information (additional aspect ratio
1776 * information only used in DVB MPEG-2 transport streams)
1777 * 0 if not set.
1778 *
1779 * - encoding: unused
1780 * - decoding: Set by decoder.
1781 */
1782 int dtg_active_format;
1783 #define FF_DTG_AFD_SAME 8
1784 #define FF_DTG_AFD_4_3 9
1785 #define FF_DTG_AFD_16_9 10
1786 #define FF_DTG_AFD_14_9 11
1787 #define FF_DTG_AFD_4_3_SP_14_9 13
1788 #define FF_DTG_AFD_16_9_SP_14_9 14
1789 #define FF_DTG_AFD_SP_4_3 15
1790
1791 /**
1792 * maximum motion estimation search range in subpel units
1793 * If 0 then no limit.
1794 *
1795 * - encoding: Set by user.
1796 * - decoding: unused
1797 */
1798 int me_range;
1799
1800 /**
1801 * intra quantizer bias
1802 * - encoding: Set by user.
1803 * - decoding: unused
1804 */
1805 int intra_quant_bias;
1806 #define FF_DEFAULT_QUANT_BIAS 999999
1807
1808 /**
1809 * inter quantizer bias
1810 * - encoding: Set by user.
1811 * - decoding: unused
1812 */
1813 int inter_quant_bias;
1814
1815 /**
1816 * color table ID
1817 * - encoding: unused
1818 * - decoding: Which clrtable should be used for 8bit RGB images.
1819 * Tables have to be stored somewhere. FIXME
1820 */
1821 int color_table_id;
1822
1823 /**
1824 * internal_buffer count
1825 * Don't touch, used by libavcodec default_get_buffer().
1826 */
1827 int internal_buffer_count;
1828
1829 /**
1830 * internal_buffers
1831 * Don't touch, used by libavcodec default_get_buffer().
1832 */
1833 void *internal_buffer;
1834
1835 #define FF_LAMBDA_SHIFT 7
1836 #define FF_LAMBDA_SCALE (1<<FF_LAMBDA_SHIFT)
1837 #define FF_QP2LAMBDA 118 ///< factor to convert from H.263 QP to lambda
1838 #define FF_LAMBDA_MAX (256*128-1)
1839
1840 #define FF_QUALITY_SCALE FF_LAMBDA_SCALE //FIXME maybe remove
1841 /**
1842 * Global quality for codecs which cannot change it per frame.
1843 * This should be proportional to MPEG-1/2/4 qscale.
1844 * - encoding: Set by user.
1845 * - decoding: unused
1846 */
1847 int global_quality;
1848
1849 #define FF_CODER_TYPE_VLC 0
1850 #define FF_CODER_TYPE_AC 1
1851 #define FF_CODER_TYPE_RAW 2
1852 #define FF_CODER_TYPE_RLE 3
1853 #define FF_CODER_TYPE_DEFLATE 4
1854 /**
1855 * coder type
1856 * - encoding: Set by user.
1857 * - decoding: unused
1858 */
1859 int coder_type;
1860
1861 /**
1862 * context model
1863 * - encoding: Set by user.
1864 * - decoding: unused
1865 */
1866 int context_model;
1867 #if 0
1868 /**
1869 *
1870 * - encoding: unused
1871 * - decoding: Set by user.
1872 */
1873 uint8_t * (*realloc)(struct AVCodecContext *s, uint8_t *buf, int buf_size);
1874 #endif
1875
1876 /**
1877 * slice flags
1878 * - encoding: unused
1879 * - decoding: Set by user.
1880 */
1881 int slice_flags;
1882 #define SLICE_FLAG_CODED_ORDER 0x0001 ///< draw_horiz_band() is called in coded order instead of display
1883 #define SLICE_FLAG_ALLOW_FIELD 0x0002 ///< allow draw_horiz_band() with field slices (MPEG2 field pics)
1884 #define SLICE_FLAG_ALLOW_PLANE 0x0004 ///< allow draw_horiz_band() with 1 component at a time (SVQ1)
1885
1886 /**
1887 * XVideo Motion Acceleration
1888 * - encoding: forbidden
1889 * - decoding: set by decoder
1890 */
1891 int xvmc_acceleration;
1892
1893 /**
1894 * macroblock decision mode
1895 * - encoding: Set by user.
1896 * - decoding: unused
1897 */
1898 int mb_decision;
1899 #define FF_MB_DECISION_SIMPLE 0 ///< uses mb_cmp
1900 #define FF_MB_DECISION_BITS 1 ///< chooses the one which needs the fewest bits
1901 #define FF_MB_DECISION_RD 2 ///< rate distortion
1902
1903 /**
1904 * custom intra quantization matrix
1905 * - encoding: Set by user, can be NULL.
1906 * - decoding: Set by libavcodec.
1907 */
1908 uint16_t *intra_matrix;
1909
1910 /**
1911 * custom inter quantization matrix
1912 * - encoding: Set by user, can be NULL.
1913 * - decoding: Set by libavcodec.
1914 */
1915 uint16_t *inter_matrix;
1916
1917 /**
1918 * fourcc from the AVI stream header (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A').
1919 * This is used to work around some encoder bugs.
1920 * - encoding: unused
1921 * - decoding: Set by user, will be converted to uppercase by libavcodec during init.
1922 */
1923 unsigned int stream_codec_tag;
1924
1925 /**
1926 * scene change detection threshold
1927 * 0 is default, larger means fewer detected scene changes.
1928 * - encoding: Set by user.
1929 * - decoding: unused
1930 */
1931 int scenechange_threshold;
1932
1933 /**
1934 * minimum Lagrange multipler
1935 * - encoding: Set by user.
1936 * - decoding: unused
1937 */
1938 int lmin;
1939
1940 /**
1941 * maximum Lagrange multipler
1942 * - encoding: Set by user.
1943 * - decoding: unused
1944 */
1945 int lmax;
1946
1947 /**
1948 * palette control structure
1949 * - encoding: ??? (no palette-enabled encoder yet)
1950 * - decoding: Set by user.
1951 */
1952 struct AVPaletteControl *palctrl;
1953
1954 /**
1955 * noise reduction strength
1956 * - encoding: Set by user.
1957 * - decoding: unused
1958 */
1959 int noise_reduction;
1960
1961 /**
1962 * Called at the beginning of a frame to get cr buffer for it.
1963 * Buffer type (size, hints) must be the same. libavcodec won't check it.
1964 * libavcodec will pass previous buffer in pic, function should return
1965 * same buffer or new buffer with old frame "painted" into it.
1966 * If pic.data[0] == NULL must behave like get_buffer().
1967 * if CODEC_CAP_DR1 is not set then reget_buffer() must call
1968 * avcodec_default_reget_buffer() instead of providing buffers allocated by
1969 * some other means.
1970 * - encoding: unused
1971 * - decoding: Set by libavcodec., user can override
1972 */
1973 int (*reget_buffer)(struct AVCodecContext *c, AVFrame *pic);
1974
1975 /**
1976 * Number of bits which should be loaded into the rc buffer before decoding starts.
1977 * - encoding: Set by user.
1978 * - decoding: unused
1979 */
1980 int rc_initial_buffer_occupancy;
1981
1982 /**
1983 *
1984 * - encoding: Set by user.
1985 * - decoding: unused
1986 */
1987 int inter_threshold;
1988
1989 /**
1990 * CODEC_FLAG2_*
1991 * - encoding: Set by user.
1992 * - decoding: Set by user.
1993 */
1994 int flags2;
1995
1996 /**
1997 * Simulates errors in the bitstream to test error concealment.
1998 * - encoding: Set by user.
1999 * - decoding: unused
2000 */
2001 int error_rate;
2002
2003 /**
2004 * MP3 antialias algorithm, see FF_AA_* below.
2005 * - encoding: unused
2006 * - decoding: Set by user.
2007 */
2008 int antialias_algo;
2009 #define FF_AA_AUTO 0
2010 #define FF_AA_FASTINT 1 //not implemented yet
2011 #define FF_AA_INT 2
2012 #define FF_AA_FLOAT 3
2013 /**
2014 * quantizer noise shaping
2015 * - encoding: Set by user.
2016 * - decoding: unused
2017 */
2018 int quantizer_noise_shaping;
2019
2020 /**
2021 * thread count
2022 * is used to decide how many independent tasks should be passed to execute()
2023 * - encoding: Set by user.
2024 * - decoding: Set by user.
2025 */
2026 int thread_count;
2027
2028 /**
2029 * The codec may call this to execute several independent things.
2030 * It will return only after finishing all tasks.
2031 * The user may replace this with some multithreaded implementation,
2032 * the default implementation will execute the parts serially.
2033 * @param count the number of things to execute
2034 * - encoding: Set by libavcodec, user can override.
2035 * - decoding: Set by libavcodec, user can override.
2036 */
2037 int (*execute)(struct AVCodecContext *c, int (*func)(struct AVCodecContext *c2, void *arg), void *arg2, int *ret, int count, int size);
2038
2039 /**
2040 * thread opaque
2041 * Can be used by execute() to store some per AVCodecContext stuff.
2042 * - encoding: set by execute()
2043 * - decoding: set by execute()
2044 */
2045 void *thread_opaque;
2046
2047 /**
2048 * Motion estimation threshold below which no motion estimation is
2049 * performed, but instead the user specified motion vectors are used.
2050 *
2051 * - encoding: Set by user.
2052 * - decoding: unused
2053 */
2054 int me_threshold;
2055
2056 /**
2057 * Macroblock threshold below which the user specified macroblock types will be used.
2058 * - encoding: Set by user.
2059 * - decoding: unused
2060 */
2061 int mb_threshold;
2062
2063 /**
2064 * precision of the intra DC coefficient - 8
2065 * - encoding: Set by user.
2066 * - decoding: unused
2067 */
2068 int intra_dc_precision;
2069
2070 /**
2071 * noise vs. sse weight for the nsse comparsion function
2072 * - encoding: Set by user.
2073 * - decoding: unused
2074 */
2075 int nsse_weight;
2076
2077 /**
2078 * Number of macroblock rows at the top which are skipped.
2079 * - encoding: unused
2080 * - decoding: Set by user.
2081 */
2082 int skip_top;
2083
2084 /**
2085 * Number of macroblock rows at the bottom which are skipped.
2086 * - encoding: unused
2087 * - decoding: Set by user.
2088 */
2089 int skip_bottom;
2090
2091 /**
2092 * profile
2093 * - encoding: Set by user.
2094 * - decoding: Set by libavcodec.
2095 */
2096 int profile;
2097 #define FF_PROFILE_UNKNOWN -99
2098 #define FF_PROFILE_AAC_MAIN 0
2099 #define FF_PROFILE_AAC_LOW 1
2100 #define FF_PROFILE_AAC_SSR 2
2101 #define FF_PROFILE_AAC_LTP 3
2102
2103 /**
2104 * level
2105 * - encoding: Set by user.
2106 * - decoding: Set by libavcodec.
2107 */
2108 int level;
2109 #define FF_LEVEL_UNKNOWN -99
2110
2111 /**
2112 * low resolution decoding, 1-> 1/2 size, 2->1/4 size
2113 * - encoding: unused
2114 * - decoding: Set by user.
2115 */
2116 int lowres;
2117
2118 /**
2119 * Bitstream width / height, may be different from width/height if lowres
2120 * or other things are used.
2121 * - encoding: unused
2122 * - decoding: Set by user before init if known. Codec should override / dynamically change if needed.
2123 */
2124 int coded_width, coded_height;
2125
2126 /**
2127 * frame skip threshold
2128 * - encoding: Set by user.
2129 * - decoding: unused
2130 */
2131 int frame_skip_threshold;
2132
2133 /**
2134 * frame skip factor
2135 * - encoding: Set by user.
2136 * - decoding: unused
2137 */
2138 int frame_skip_factor;
2139
2140 /**
2141 * frame skip exponent
2142 * - encoding: Set by user.
2143 * - decoding: unused
2144 */
2145 int frame_skip_exp;
2146
2147 /**
2148 * frame skip comparison function
2149 * - encoding: Set by user.
2150 * - decoding: unused
2151 */
2152 int frame_skip_cmp;
2153
2154 /**
2155 * Border processing masking, raises the quantizer for mbs on the borders
2156 * of the picture.
2157 * - encoding: Set by user.
2158 * - decoding: unused
2159 */
2160 float border_masking;
2161
2162 /**
2163 * minimum MB lagrange multipler
2164 * - encoding: Set by user.
2165 * - decoding: unused
2166 */
2167 int mb_lmin;
2168
2169 /**
2170 * maximum MB lagrange multipler
2171 * - encoding: Set by user.
2172 * - decoding: unused
2173 */
2174 int mb_lmax;
2175
2176 /**
2177 *
2178 * - encoding: Set by user.
2179 * - decoding: unused
2180 */
2181 int me_penalty_compensation;
2182
2183 /**
2184 *
2185 * - encoding: unused
2186 * - decoding: Set by user.
2187 */
2188 enum AVDiscard skip_loop_filter;
2189
2190 /**
2191 *
2192 * - encoding: unused
2193 * - decoding: Set by user.
2194 */
2195 enum AVDiscard skip_idct;
2196
2197 /**
2198 *
2199 * - encoding: unused
2200 * - decoding: Set by user.
2201 */
2202 enum AVDiscard skip_frame;
2203
2204 /**
2205 *
2206 * - encoding: Set by user.
2207 * - decoding: unused
2208 */
2209 int bidir_refine;
2210
2211 /**
2212 *
2213 * - encoding: Set by user.
2214 * - decoding: unused
2215 */
2216 int brd_scale;
2217
2218 /**
2219 * constant rate factor - quality-based VBR - values ~correspond to qps
2220 * - encoding: Set by user.
2221 * - decoding: unused
2222 */
2223 float crf;
2224
2225 /**
2226 * constant quantization parameter rate control method
2227 * - encoding: Set by user.
2228 * - decoding: unused
2229 */
2230 int cqp;
2231
2232 /**
2233 * minimum GOP size
2234 * - encoding: Set by user.
2235 * - decoding: unused
2236 */
2237 int keyint_min;
2238
2239 /**
2240 * number of reference frames
2241 * - encoding: Set by user.
2242 * - decoding: Set by lavc.
2243 */
2244 int refs;
2245
2246 /**
2247 * chroma qp offset from luma
2248 * - encoding: Set by user.
2249 * - decoding: unused
2250 */
2251 int chromaoffset;
2252
2253 /**
2254 * Influences how often B-frames are used.
2255 * - encoding: Set by user.
2256 * - decoding: unused
2257 */
2258 int bframebias;
2259
2260 /**
2261 * trellis RD quantization
2262 * - encoding: Set by user.
2263 * - decoding: unused
2264 */
2265 int trellis;
2266
2267 /**
2268 * Reduce fluctuations in qp (before curve compression).
2269 * - encoding: Set by user.
2270 * - decoding: unused
2271 */
2272 float complexityblur;
2273
2274 /**
2275 * in-loop deblocking filter alphac0 parameter
2276 * alpha is in the range -6...6
2277 * - encoding: Set by user.
2278 * - decoding: unused
2279 */
2280 int deblockalpha;
2281
2282 /**
2283 * in-loop deblocking filter beta parameter
2284 * beta is in the range -6...6
2285 * - encoding: Set by user.
2286 * - decoding: unused
2287 */
2288 int deblockbeta;
2289
2290 /**
2291 * macroblock subpartition sizes to consider - p8x8, p4x4, b8x8, i8x8, i4x4
2292 * - encoding: Set by user.
2293 * - decoding: unused
2294 */
2295 int partitions;
2296 #define X264_PART_I4X4 0x001 /* Analyze i4x4 */
2297 #define X264_PART_I8X8 0x002 /* Analyze i8x8 (requires 8x8 transform) */
2298 #define X264_PART_P8X8 0x010 /* Analyze p16x8, p8x16 and p8x8 */
2299 #define X264_PART_P4X4 0x020 /* Analyze p8x4, p4x8, p4x4 */
2300 #define X264_PART_B8X8 0x100 /* Analyze b16x8, b8x16 and b8x8 */
2301
2302 /**
2303 * direct MV prediction mode - 0 (none), 1 (spatial), 2 (temporal), 3 (auto)
2304 * - encoding: Set by user.
2305 * - decoding: unused
2306 */
2307 int directpred;
2308
2309 /**
2310 * Audio cutoff bandwidth (0 means "automatic")
2311 * - encoding: Set by user.
2312 * - decoding: unused
2313 */
2314 int cutoff;
2315
2316 /**
2317 * Multiplied by qscale for each frame and added to scene_change_score.
2318 * - encoding: Set by user.
2319 * - decoding: unused
2320 */
2321 int scenechange_factor;
2322
2323 /**
2324 *
2325 * Note: Value depends upon the compare function used for fullpel ME.
2326 * - encoding: Set by user.
2327 * - decoding: unused
2328 */
2329 int mv0_threshold;
2330
2331 /**
2332 * Adjusts sensitivity of b_frame_strategy 1.
2333 * - encoding: Set by user.
2334 * - decoding: unused
2335 */
2336 int b_sensitivity;
2337
2338 /**
2339 * - encoding: Set by user.
2340 * - decoding: unused
2341 */
2342 int compression_level;
2343 #define FF_COMPRESSION_DEFAULT -1
2344
2345 /**
2346 * Sets whether to use LPC mode - used by FLAC encoder.
2347 * - encoding: Set by user.
2348 * - decoding: unused
2349 */
2350 int use_lpc;
2351
2352 /**
2353 * LPC coefficient precision - used by FLAC encoder
2354 * - encoding: Set by user.
2355 * - decoding: unused
2356 */
2357 int lpc_coeff_precision;
2358
2359 /**
2360 * - encoding: Set by user.
2361 * - decoding: unused
2362 */
2363 int min_prediction_order;
2364
2365 /**
2366 * - encoding: Set by user.
2367 * - decoding: unused
2368 */
2369 int max_prediction_order;
2370
2371 /**
2372 * search method for selecting prediction order
2373 * - encoding: Set by user.
2374 * - decoding: unused
2375 */
2376 int prediction_order_method;
2377
2378 /**
2379 * - encoding: Set by user.
2380 * - decoding: unused
2381 */
2382 int min_partition_order;
2383
2384 /**
2385 * - encoding: Set by user.
2386 * - decoding: unused
2387 */
2388 int max_partition_order;
2389
2390 /**
2391 * GOP timecode frame start number, in non drop frame format
2392 * - encoding: Set by user.
2393 * - decoding: unused
2394 */
2395 int64_t timecode_frame_start;
2396
2397 #if LIBAVCODEC_VERSION_MAJOR < 53
2398 /**
2399 * Decoder should decode to this many channels if it can (0 for default)
2400 * - encoding: unused
2401 * - decoding: Set by user.
2402 * @deprecated Deprecated in favor of request_channel_layout.
2403 */
2404 int request_channels;
2405 #endif
2406
2407 /**
2408 * Percentage of dynamic range compression to be applied by the decoder.
2409 * The default value is 1.0, corresponding to full compression.
2410 * - encoding: unused
2411 * - decoding: Set by user.
2412 */
2413 float drc_scale;
2414
2415 /**
2416 * opaque 64bit number (generally a PTS) that will be reordered and
2417 * output in AVFrame.reordered_opaque
2418 * - encoding: unused
2419 * - decoding: Set by user.
2420 */
2421 int64_t reordered_opaque;
2422
2423 /**
2424 * Bits per sample/pixel of internal libavcodec pixel/sample format.
2425 * This field is applicable only when sample_fmt is SAMPLE_FMT_S32.
2426 * - encoding: set by user.
2427 * - decoding: set by libavcodec.
2428 */
2429 int bits_per_raw_sample;
2430
2431 /**
2432 * Audio channel layout.
2433 * - encoding: set by user.
2434 * - decoding: set by libavcodec.
2435 */
2436 int64_t channel_layout;
2437
2438 /**
2439 * Request decoder to use this channel layout if it can (0 for default)
2440 * - encoding: unused
2441 * - decoding: Set by user.
2442 */
2443 int64_t request_channel_layout;
2444
2445 /**
2446 * Ratecontrol attempt to use, at maximum, <value> of what can be used without an underflow.
2447 * - encoding: Set by user.
2448 * - decoding: unused.
2449 */
2450 float rc_max_available_vbv_use;
2451
2452 /**
2453 * Ratecontrol attempt to use, at least, <value> times the amount needed to prevent a vbv overflow.
2454 * - encoding: Set by user.
2455 * - decoding: unused.
2456 */
2457 float rc_min_vbv_overflow_use;
2458
2459 /**
2460 * Hardware accelerator in use
2461 * - encoding: unused.
2462 * - decoding: Set by libavcodec
2463 */
2464 struct AVHWAccel *hwaccel;
2465
2466 /**
2467 * For some codecs, the time base is closer to the field rate than the frame rate.
2468 * Most notably, H.264 and MPEG-2 specify time_base as half of frame duration
2469 * if no telecine is used ...
2470 *
2471 * Set to time_base ticks per frame. Default 1, e.g., H.264/MPEG-2 set it to 2.
2472 */
2473 int ticks_per_frame;
2474
2475 /**
2476 * Hardware accelerator context.
2477 * For some hardware accelerators, a global context needs to be
2478 * provided by the user. In that case, this holds display-dependent
2479 * data FFmpeg cannot instantiate itself. Please refer to the
2480 * FFmpeg HW accelerator documentation to know how to fill this
2481 * is. e.g. for VA API, this is a struct vaapi_context.
2482 * - encoding: unused
2483 * - decoding: Set by user
2484 */
2485 void *hwaccel_context;
2486
2487 /**
2488 * Chromaticity coordinates of the source primaries.
2489 * - encoding: Set by user
2490 * - decoding: Set by libavcodec
2491 */
2492 enum AVColorPrimaries color_primaries;
2493
2494 /**
2495 * Color Transfer Characteristic.
2496 * - encoding: Set by user
2497 * - decoding: Set by libavcodec
2498 */
2499 enum AVColorTransferCharacteristic color_trc;
2500
2501 /**
2502 * YUV colorspace type.
2503 * - encoding: Set by user
2504 * - decoding: Set by libavcodec
2505 */
2506 enum AVColorSpace colorspace;
2507
2508 /**
2509 * MPEG vs JPEG YUV range.
2510 * - encoding: Set by user
2511 * - decoding: Set by libavcodec
2512 */
2513 enum AVColorRange color_range;
2514
2515 /**
2516 * This defines the location of chroma samples.
2517 * - encoding: Set by user
2518 * - decoding: Set by libavcodec
2519 */
2520 enum AVChromaLocation chroma_sample_location;
2521 } AVCodecContext;
2522
2523 /**
2524 * AVCodec.
2525 */
2526 typedef struct AVCodec {
2527 /**
2528 * Name of the codec implementation.
2529 * The name is globally unique among encoders and among decoders (but an
2530 * encoder and a decoder can share the same name).
2531 * This is the primary way to find a codec from the user perspective.
2532 */
2533 const char *name;
2534 enum CodecType type;
2535 enum CodecID id;
2536 int priv_data_size;
2537 int (*init)(AVCodecContext *);
2538 int (*encode)(AVCodecContext *, uint8_t *buf, int buf_size, void *data);
2539 int (*close)(AVCodecContext *);
2540 int (*decode)(AVCodecContext *, void *outdata, int *outdata_size, AVPacket *avpkt);
2541 /**
2542 * Codec capabilities.
2543 * see CODEC_CAP_*
2544 */
2545 int capabilities;
2546 struct AVCodec *next;
2547 /**
2548 * Flush buffers.
2549 * Will be called when seeking
2550 */
2551 void (*flush)(AVCodecContext *);
2552 const AVRational *supported_framerates; ///< array of supported framerates, or NULL if any, array is terminated by {0,0}
2553 const enum PixelFormat *pix_fmts; ///< array of supported pixel formats, or NULL if unknown, array is terminated by -1
2554 /**
2555 * Descriptive name for the codec, meant to be more human readable than name.
2556 * You should use the NULL_IF_CONFIG_SMALL() macro to define it.
2557 */
2558 const char *long_name;
2559 const int *supported_samplerates; ///< array of supported audio samplerates, or NULL if unknown, array is terminated by 0
2560 const enum SampleFormat *sample_fmts; ///< array of supported sample formats, or NULL if unknown, array is terminated by -1
2561 const int64_t *channel_layouts; ///< array of support channel layouts, or NULL if unknown. array is terminated by 0
2562 } AVCodec;
2563
2564 /**
2565 * AVHWAccel.
2566 */
2567 typedef struct AVHWAccel {
2568 /**
2569 * Name of the hardware accelerated codec.
2570 * The name is globally unique among encoders and among decoders (but an
2571 * encoder and a decoder can share the same name).
2572 */
2573 const char *name;
2574
2575 /**
2576 * Type of codec implemented by the hardware accelerator.
2577 *
2578 * See CODEC_TYPE_xxx
2579 */
2580 enum CodecType type;
2581
2582 /**
2583 * Codec implemented by the hardware accelerator.
2584 *
2585 * See CODEC_ID_xxx
2586 */
2587 enum CodecID id;
2588
2589 /**
2590 * Supported pixel format.
2591 *
2592 * Only hardware accelerated formats are supported here.
2593 */
2594 enum PixelFormat pix_fmt;
2595
2596 /**
2597 * Hardware accelerated codec capabilities.
2598 * see FF_HWACCEL_CODEC_CAP_*
2599 */
2600 int capabilities;
2601
2602 struct AVHWAccel *next;
2603
2604 /**
2605 * Called at the beginning of each frame or field picture.
2606 *
2607 * Meaningful frame information (codec specific) is guaranteed to
2608 * be parsed at this point. This function is mandatory.
2609 *
2610 * Note that buf can be NULL along with buf_size set to 0.
2611 * Otherwise, this means the whole frame is available at this point.
2612 *
2613 * @param avctx the codec context
2614 * @param buf the frame data buffer base
2615 * @param buf_size the size of the frame in bytes
2616 * @return zero if successful, a negative value otherwise
2617 */
2618 int (*start_frame)(AVCodecContext *avctx, const uint8_t *buf, uint32_t buf_size);
2619
2620 /**
2621 * Callback for each slice.
2622 *
2623 * Meaningful slice information (codec specific) is guaranteed to
2624 * be parsed at this point. This function is mandatory.
2625 *
2626 * @param avctx the codec context
2627 * @param buf the slice data buffer base
2628 * @param buf_size the size of the slice in bytes
2629 * @return zero if successful, a negative value otherwise
2630 */
2631 int (*decode_slice)(AVCodecContext *avctx, const uint8_t *buf, uint32_t buf_size);
2632
2633 /**
2634 * Called at the end of each frame or field picture.
2635 *
2636 * The whole picture is parsed at this point and can now be sent
2637 * to the hardware accelerator. This function is mandatory.
2638 *
2639 * @param avctx the codec context
2640 * @return zero if successful, a negative value otherwise
2641 */
2642 int (*end_frame)(AVCodecContext *avctx);
2643
2644 /**
2645 * Size of HW accelerator private data.
2646 *
2647 * Private data is allocated with av_mallocz() before
2648 * AVCodecContext.get_buffer() and deallocated after
2649 * AVCodecContext.release_buffer().
2650 */
2651 int priv_data_size;
2652 } AVHWAccel;
2653
2654 /**
2655 * four components are given, that's all.
2656 * the last component is alpha
2657 */
2658 typedef struct AVPicture {
2659 uint8_t *data[4];
2660 int linesize[4]; ///< number of bytes per line
2661 } AVPicture;
2662
2663 #if LIBAVCODEC_VERSION_MAJOR < 53
2664 /**
2665 * AVPaletteControl
2666 * This structure defines a method for communicating palette changes
2667 * between and demuxer and a decoder.
2668 *
2669 * @deprecated Use AVPacket to send palette changes instead.
2670 * This is totally broken.
2671 */
2672 #define AVPALETTE_SIZE 1024
2673 #define AVPALETTE_COUNT 256
2674 typedef struct AVPaletteControl {
2675
2676 /* Demuxer sets this to 1 to indicate the palette has changed;
2677 * decoder resets to 0. */
2678 int palette_changed;
2679
2680 /* 4-byte ARGB palette entries, stored in native byte order; note that
2681 * the individual palette components should be on a 8-bit scale; if
2682 * the palette data comes from an IBM VGA native format, the component
2683 * data is probably 6 bits in size and needs to be scaled. */
2684 unsigned int palette[AVPALETTE_COUNT];
2685
2686 } AVPaletteControl attribute_deprecated;
2687 #endif
2688
2689 enum AVSubtitleType {
2690 SUBTITLE_NONE,
2691
2692 SUBTITLE_BITMAP, ///< A bitmap, pict will be set
2693
2694 /**
2695 * Plain text, the text field must be set by the decoder and is
2696 * authoritative. ass and pict fields may contain approximations.
2697 */
2698 SUBTITLE_TEXT,
2699
2700 /**
2701 * Formatted text, the ass field must be set by the decoder and is
2702 * authoritative. pict and text fields may contain approximations.
2703 */
2704 SUBTITLE_ASS,
2705 };
2706
2707 typedef struct AVSubtitleRect {
2708 int x; ///< top left corner of pict, undefined when pict is not set
2709 int y; ///< top left corner of pict, undefined when pict is not set
2710 int w; ///< width of pict, undefined when pict is not set
2711 int h; ///< height of pict, undefined when pict is not set
2712 int nb_colors; ///< number of colors in pict, undefined when pict is not set
2713
2714 /**
2715 * data+linesize for the bitmap of this subtitle.
2716 * can be set for text/ass as well once they where rendered
2717 */
2718 AVPicture pict;
2719 enum AVSubtitleType type;
2720
2721 char *text; ///< 0 terminated plain UTF-8 text
2722
2723 /**
2724 * 0 terminated ASS/SSA compatible event line.
2725 * The pressentation of this is unaffected by the other values in this
2726 * struct.
2727 */
2728 char *ass;
2729 } AVSubtitleRect;
2730
2731 typedef struct AVSubtitle {
2732 uint16_t format; /* 0 = graphics */
2733 uint32_t start_display_time; /* relative to packet pts, in ms */
2734 uint32_t end_display_time; /* relative to packet pts, in ms */
2735 unsigned num_rects;
2736 AVSubtitleRect **rects;
2737 int64_t pts; ///< Same as packet pts, in AV_TIME_BASE
2738 } AVSubtitle;
2739
2740 /* packet functions */
2741
2742 /**
2743 * @deprecated use NULL instead
2744 */
2745 attribute_deprecated void av_destruct_packet_nofree(AVPacket *pkt);
2746
2747 /**
2748 * Default packet destructor.
2749 */
2750 void av_destruct_packet(AVPacket *pkt);
2751
2752 /**
2753 * Initialize optional fields of a packet with default values.
2754 *
2755 * @param pkt packet
2756 */
2757 void av_init_packet(AVPacket *pkt);
2758
2759 /**
2760 * Allocate the payload of a packet and initialize its fields with
2761 * default values.
2762 *
2763 * @param pkt packet
2764 * @param size wanted payload size
2765 * @return 0 if OK, AVERROR_xxx otherwise
2766 */
2767 int av_new_packet(AVPacket *pkt, int size);
2768
2769 /**
2770 * Reduce packet size, correctly zeroing padding
2771 *
2772 * @param pkt packet
2773 * @param size new size
2774 */
2775 void av_shrink_packet(AVPacket *pkt, int size);
2776
2777 /**
2778 * @warning This is a hack - the packet memory allocation stuff is broken. The
2779 * packet is allocated if it was not really allocated.
2780 */
2781 int av_dup_packet(AVPacket *pkt);
2782
2783 /**
2784 * Free a packet.
2785 *
2786 * @param pkt packet to free
2787 */
2788 void av_free_packet(AVPacket *pkt);
2789
2790 /* resample.c */
2791
2792 struct ReSampleContext;
2793 struct AVResampleContext;
2794
2795 typedef struct ReSampleContext ReSampleContext;
2796
2797 #if LIBAVCODEC_VERSION_MAJOR < 53
2798 /**
2799 * @deprecated Use av_audio_resample_init() instead.
2800 */
2801 attribute_deprecated ReSampleContext *audio_resample_init(int output_channels, int input_channels,
2802 int output_rate, int input_rate);
2803 #endif
2804 /**
2805 * Initializes audio resampling context
2806 *
2807 * @param output_channels number of output channels
2808 * @param input_channels number of input channels
2809 * @param output_rate output sample rate
2810 * @param input_rate input sample rate
2811 * @param sample_fmt_out requested output sample format
2812 * @param sample_fmt_in input sample format
2813 * @param filter_length length of each FIR filter in the filterbank relative to the cutoff freq
2814 * @param log2_phase_count log2 of the number of entries in the polyphase filterbank
2815 * @param linear If 1 then the used FIR filter will be linearly interpolated
2816 between the 2 closest, if 0 the closest will be used
2817 * @param cutoff cutoff frequency, 1.0 corresponds to half the output sampling rate
2818 * @return allocated ReSampleContext, NULL if error occured
2819 */
2820 ReSampleContext *av_audio_resample_init(int output_channels, int input_channels,
2821 int output_rate, int input_rate,
2822 enum SampleFormat sample_fmt_out,
2823 enum SampleFormat sample_fmt_in,
2824 int filter_length, int log2_phase_count,
2825 int linear, double cutoff);
2826
2827 int audio_resample(ReSampleContext *s, short *output, short *input, int nb_samples);
2828 void audio_resample_close(ReSampleContext *s);
2829
2830
2831 /**
2832 * Initializes an audio resampler.
2833 * Note, if either rate is not an integer then simply scale both rates up so they are.
2834 * @param filter_length length of each FIR filter in the filterbank relative to the cutoff freq
2835 * @param log2_phase_count log2 of the number of entries in the polyphase filterbank
2836 * @param linear If 1 then the used FIR filter will be linearly interpolated
2837 between the 2 closest, if 0 the closest will be used
2838 * @param cutoff cutoff frequency, 1.0 corresponds to half the output sampling rate
2839 */
2840 struct AVResampleContext *av_resample_init(int out_rate, int in_rate, int filter_length, int log2_phase_count, int linear, double cutoff);
2841
2842 /**
2843 * resamples.
2844 * @param src an array of unconsumed samples
2845 * @param consumed the number of samples of src which have been consumed are returned here
2846 * @param src_size the number of unconsumed samples available
2847 * @param dst_size the amount of space in samples available in dst
2848 * @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.
2849 * @return the number of samples written in dst or -1 if an error occurred
2850 */
2851 int av_resample(struct AVResampleContext *c, short *dst, short *src, int *consumed, int src_size, int dst_size, int update_ctx);
2852
2853
2854 /**
2855 * Compensates samplerate/timestamp drift. The compensation is done by changing
2856 * the resampler parameters, so no audible clicks or similar distortions occur
2857 * @param compensation_distance distance in output samples over which the compensation should be performed
2858 * @param sample_delta number of output samples which should be output less
2859 *
2860 * example: av_resample_compensate(c, 10, 500)
2861 * here instead of 510 samples only 500 samples would be output
2862 *
2863 * note, due to rounding the actual compensation might be slightly different,
2864 * especially if the compensation_distance is large and the in_rate used during init is small
2865 */
2866 void av_resample_compensate(struct AVResampleContext *c, int sample_delta, int compensation_distance);
2867 void av_resample_close(struct AVResampleContext *c);
2868
2869 /**
2870 * Allocate memory for a picture. Call avpicture_free to free it.
2871 *
2872 * @param picture the picture to be filled in
2873 * @param pix_fmt the format of the picture
2874 * @param width the width of the picture
2875 * @param height the height of the picture
2876 * @return zero if successful, a negative value if not
2877 */
2878 int avpicture_alloc(AVPicture *picture, enum PixelFormat pix_fmt, int width, int height);
2879
2880 /**
2881 * Free a picture previously allocated by avpicture_alloc().
2882 *
2883 * @param picture the AVPicture to be freed
2884 */
2885 void avpicture_free(AVPicture *picture);
2886
2887 /**
2888 * Fill in the AVPicture fields.
2889 * The fields of the given AVPicture are filled in by using the 'ptr' address
2890 * which points to the image data buffer. Depending on the specified picture
2891 * format, one or multiple image data pointers and line sizes will be set.
2892 * If a planar format is specified, several pointers will be set pointing to
2893 * the different picture planes and the line sizes of the different planes
2894 * will be stored in the lines_sizes array.
2895 * Call with ptr == NULL to get the required size for the ptr buffer.
2896 *
2897 * @param picture AVPicture whose fields are to be filled in
2898 * @param ptr Buffer which will contain or contains the actual image data
2899 * @param pix_fmt The format in which the picture data is stored.
2900 * @param width the width of the image in pixels
2901 * @param height the height of the image in pixels
2902 * @return size of the image data in bytes
2903 */
2904 int avpicture_fill(AVPicture *picture, uint8_t *ptr,
2905 enum PixelFormat pix_fmt, int width, int height);
2906 int avpicture_layout(const AVPicture* src, enum PixelFormat pix_fmt, int width, int height,
2907 unsigned char *dest, int dest_size);
2908
2909 /**
2910 * Calculate the size in bytes that a picture of the given width and height
2911 * would occupy if stored in the given picture format.
2912 * Note that this returns the size of a compact representation as generated
2913 * by avpicture_layout, which can be smaller than the size required for e.g.
2914 * avpicture_fill.
2915 *
2916 * @param pix_fmt the given picture format
2917 * @param width the width of the image
2918 * @param height the height of the image
2919 * @return Image data size in bytes or -1 on error (e.g. too large dimensions).
2920 */
2921 int avpicture_get_size(enum PixelFormat pix_fmt, int width, int height);
2922 void avcodec_get_chroma_sub_sample(enum PixelFormat pix_fmt, int *h_shift, int *v_shift);
2923 const char *avcodec_get_pix_fmt_name(enum PixelFormat pix_fmt);
2924 void avcodec_set_dimensions(AVCodecContext *s, int width, int height);
2925
2926 /**
2927 * Returns the pixel format corresponding to the name name.
2928 *
2929 * If there is no pixel format with name name, then looks for a
2930 * pixel format with the name corresponding to the native endian
2931 * format of name.
2932 * For example in a little-endian system, first looks for "gray16",
2933 * then for "gray16le".
2934 *
2935 * Finally if no pixel format has been found, returns PIX_FMT_NONE.
2936 */
2937 enum PixelFormat avcodec_get_pix_fmt(const char* name);
2938 unsigned int avcodec_pix_fmt_to_codec_tag(enum PixelFormat p);
2939
2940 #define FF_LOSS_RESOLUTION 0x0001 /**< loss due to resolution change */
2941 #define FF_LOSS_DEPTH 0x0002 /**< loss due to color depth change */
2942 #define FF_LOSS_COLORSPACE 0x0004 /**< loss due to color space conversion */
2943 #define FF_LOSS_ALPHA 0x0008 /**< loss of alpha bits */
2944 #define FF_LOSS_COLORQUANT 0x0010 /**< loss due to color quantization */
2945 #define FF_LOSS_CHROMA 0x0020 /**< loss of chroma (e.g. RGB to gray conversion) */
2946
2947 /**
2948 * Computes what kind of losses will occur when converting from one specific
2949 * pixel format to another.
2950 * When converting from one pixel format to another, information loss may occur.
2951 * For example, when converting from RGB24 to GRAY, the color information will
2952 * be lost. Similarly, other losses occur when converting from some formats to
2953 * other formats. These losses can involve loss of chroma, but also loss of
2954 * resolution, loss of color depth, loss due to the color space conversion, loss
2955 * of the alpha bits or loss due to color quantization.
2956 * avcodec_get_fix_fmt_loss() informs you about the various types of losses
2957 * which will occur when converting from one pixel format to another.
2958 *
2959 * @param[in] dst_pix_fmt destination pixel format
2960 * @param[in] src_pix_fmt source pixel format
2961 * @param[in] has_alpha Whether the source pixel format alpha channel is used.
2962 * @return Combination of flags informing you what kind of losses will occur.
2963 */
2964 int avcodec_get_pix_fmt_loss(enum PixelFormat dst_pix_fmt, enum PixelFormat src_pix_fmt,
2965 int has_alpha);
2966
2967 /**
2968 * Finds the best pixel format to convert to given a certain source pixel
2969 * format. When converting from one pixel format to another, information loss
2970 * may occur. For example, when converting from RGB24 to GRAY, the color
2971 * information will be lost. Similarly, other losses occur when converting from
2972 * some formats to other formats. avcodec_find_best_pix_fmt() searches which of
2973 * the given pixel formats should be used to suffer the least amount of loss.
2974 * The pixel formats from which it chooses one, are determined by the
2975 * pix_fmt_mask parameter.
2976 *
2977 * @code
2978 * src_pix_fmt = PIX_FMT_YUV420P;
2979 * pix_fmt_mask = (1 << PIX_FMT_YUV422P) || (1 << PIX_FMT_RGB24);
2980 * dst_pix_fmt = avcodec_find_best_pix_fmt(pix_fmt_mask, src_pix_fmt, alpha, &loss);
2981 * @endcode
2982 *
2983 * @param[in] pix_fmt_mask bitmask determining which pixel format to choose from
2984 * @param[in] src_pix_fmt source pixel format
2985 * @param[in] has_alpha Whether the source pixel format alpha channel is used.
2986 * @param[out] loss_ptr Combination of flags informing you what kind of losses will occur.
2987 * @return The best pixel format to convert to or -1 if none was found.
2988 */
2989 enum PixelFormat avcodec_find_best_pix_fmt(int64_t pix_fmt_mask, enum PixelFormat src_pix_fmt,
2990 int has_alpha, int *loss_ptr);
2991
2992
2993 /**
2994 * Print in buf the string corresponding to the pixel format with
2995 * number pix_fmt, or an header if pix_fmt is negative.
2996 *
2997 * @param[in] buf the buffer where to write the string
2998 * @param[in] buf_size the size of buf
2999 * @param[in] pix_fmt the number of the pixel format to print the corresponding info string, or
3000 * a negative value to print the corresponding header.
3001 * Meaningful values for obtaining a pixel format info vary from 0 to PIX_FMT_NB -1.
3002 */
3003 void avcodec_pix_fmt_string (char *buf, int buf_size, enum PixelFormat pix_fmt);
3004
3005 #define FF_ALPHA_TRANSP 0x0001 /* image has some totally transparent pixels */
3006 #define FF_ALPHA_SEMI_TRANSP 0x0002 /* image has some transparent pixels */
3007
3008 /**
3009 * Tell if an image really has transparent alpha values.
3010 * @return ored mask of FF_ALPHA_xxx constants
3011 */
3012 int img_get_alpha_info(const AVPicture *src,
3013 enum PixelFormat pix_fmt, int width, int height);
3014
3015 /* deinterlace a picture */
3016 /* deinterlace - if not supported return -1 */
3017 int avpicture_deinterlace(AVPicture *dst, const AVPicture *src,
3018 enum PixelFormat pix_fmt, int width, int height);
3019
3020 /* external high level API */
3021
3022 /**
3023 * If c is NULL, returns the first registered codec,
3024 * if c is non-NULL, returns the next registered codec after c,
3025 * or NULL if c is the last one.
3026 */
3027 AVCodec *av_codec_next(AVCodec *c);
3028
3029 /**
3030 * Returns the LIBAVCODEC_VERSION_INT constant.
3031 */
3032 unsigned avcodec_version(void);
3033
3034 /**
3035 * Initializes libavcodec.
3036 *
3037 * @warning This function must be called before any other libavcodec
3038 * function.
3039 */
3040 void avcodec_init(void);
3041
3042 #if LIBAVCODEC_VERSION_MAJOR < 53
3043 /**
3044 * @deprecated Deprecated in favor of avcodec_register().
3045 */
3046 attribute_deprecated void register_avcodec(AVCodec *codec);
3047 #endif
3048
3049 /**
3050 * Register the codec codec and initialize libavcodec.
3051 *
3052 * @see avcodec_init()
3053 */
3054 void avcodec_register(AVCodec *codec);
3055
3056 /**
3057 * Finds a registered encoder with a matching codec ID.
3058 *
3059 * @param id CodecID of the requested encoder
3060 * @return An encoder if one was found, NULL otherwise.
3061 */
3062 AVCodec *avcodec_find_encoder(enum CodecID id);
3063
3064 /**
3065 * Finds a registered encoder with the specified name.
3066 *
3067 * @param name name of the requested encoder
3068 * @return An encoder if one was found, NULL otherwise.
3069 */
3070 AVCodec *avcodec_find_encoder_by_name(const char *name);
3071
3072 /**
3073 * Finds a registered decoder with a matching codec ID.
3074 *
3075 * @param id CodecID of the requested decoder
3076 * @return A decoder if one was found, NULL otherwise.
3077 */
3078 AVCodec *avcodec_find_decoder(enum CodecID id);
3079
3080 /**
3081 * Finds a registered decoder with the specified name.
3082 *
3083 * @param name name of the requested decoder
3084 * @return A decoder if one was found, NULL otherwise.
3085 */
3086 AVCodec *avcodec_find_decoder_by_name(const char *name);
3087 void avcodec_string(char *buf, int buf_size, AVCodecContext *enc, int encode);
3088
3089 /**
3090 * Sets the fields of the given AVCodecContext to default values.
3091 *
3092 * @param s The AVCodecContext of which the fields should be set to default values.
3093 */
3094 void avcodec_get_context_defaults(AVCodecContext *s);
3095
3096 /** THIS FUNCTION IS NOT YET PART OF THE PUBLIC API!
3097 * we WILL change its arguments and name a few times! */
3098 void avcodec_get_context_defaults2(AVCodecContext *s, enum CodecType);
3099
3100 /**
3101 * Allocates an AVCodecContext and sets its fields to default values. The
3102 * resulting struct can be deallocated by simply calling av_free().
3103 *
3104 * @return An AVCodecContext filled with default values or NULL on failure.
3105 * @see avcodec_get_context_defaults
3106 */
3107 AVCodecContext *avcodec_alloc_context(void);
3108
3109 /** THIS FUNCTION IS NOT YET PART OF THE PUBLIC API!
3110 * we WILL change its arguments and name a few times! */
3111 AVCodecContext *avcodec_alloc_context2(enum CodecType);
3112
3113 /**
3114 * Sets the fields of the given AVFrame to default values.
3115 *
3116 * @param pic The AVFrame of which the fields should be set to default values.
3117 */
3118 void avcodec_get_frame_defaults(AVFrame *pic);
3119
3120 /**
3121 * Allocates an AVFrame and sets its fields to default values. The resulting
3122 * struct can be deallocated by simply calling av_free().
3123 *
3124 * @return An AVFrame filled with default values or NULL on failure.
3125 * @see avcodec_get_frame_defaults
3126 */
3127 AVFrame *avcodec_alloc_frame(void);
3128
3129 int avcodec_default_get_buffer(AVCodecContext *s, AVFrame *pic);
3130 void avcodec_default_release_buffer(AVCodecContext *s, AVFrame *pic);
3131 int avcodec_default_reget_buffer(AVCodecContext *s, AVFrame *pic);
3132 void avcodec_align_dimensions(AVCodecContext *s, int *width, int *height);
3133
3134 /**
3135 * Checks if the given dimension of a picture is valid, meaning that all
3136 * bytes of the picture can be addressed with a signed int.
3137 *
3138 * @param[in] w Width of the picture.
3139 * @param[in] h Height of the picture.
3140 * @return Zero if valid, a negative value if invalid.
3141 */
3142 int avcodec_check_dimensions(void *av_log_ctx, unsigned int w, unsigned int h);
3143 enum PixelFormat avcodec_default_get_format(struct AVCodecContext *s, const enum PixelFormat * fmt);
3144
3145 int avcodec_thread_init(AVCodecContext *s, int thread_count);
3146 void avcodec_thread_free(AVCodecContext *s);
3147 int avcodec_thread_execute(AVCodecContext *s, int (*func)(AVCodecContext *c2, void *arg2),void *arg, int *ret, int count, int size);
3148 int avcodec_default_execute(AVCodecContext *c, int (*func)(AVCodecContext *c2, void *arg2),void *arg, int *ret, int count, int size);
3149 //FIXME func typedef
3150
3151 /**
3152 * Initializes the AVCodecContext to use the given AVCodec. Prior to using this
3153 * function the context has to be allocated.
3154 *
3155 * The functions avcodec_find_decoder_by_name(), avcodec_find_encoder_by_name(),
3156 * avcodec_find_decoder() and avcodec_find_encoder() provide an easy way for
3157 * retrieving a codec.
3158 *
3159 * @warning This function is not thread safe!
3160 *
3161 * @code
3162 * avcodec_register_all();
3163 * codec = avcodec_find_decoder(CODEC_ID_H264);
3164 * if (!codec)
3165 * exit(1);
3166 *
3167 * context = avcodec_alloc_context();
3168 *
3169 * if (avcodec_open(context, codec) < 0)
3170 * exit(1);
3171 * @endcode
3172 *
3173 * @param avctx The context which will be set up to use the given codec.
3174 * @param codec The codec to use within the context.
3175 * @return zero on success, a negative value on error
3176 * @see avcodec_alloc_context, avcodec_find_decoder, avcodec_find_encoder
3177 */
3178 int avcodec_open(AVCodecContext *avctx, AVCodec *codec);
3179
3180 #if LIBAVCODEC_VERSION_MAJOR < 53
3181 /**
3182 * Decodes an audio frame from buf into samples.
3183 * Wrapper function which calls avcodec_decode_audio3.
3184 *
3185 * @deprecated Use avcodec_decode_audio3 instead.
3186 * @param avctx the codec context
3187 * @param[out] samples the output buffer
3188 * @param[in,out] frame_size_ptr the output buffer size in bytes
3189 * @param[in] buf the input buffer
3190 * @param[in] buf_size the input buffer size in bytes
3191 * @return On error a negative value is returned, otherwise the number of bytes
3192 * used or zero if no frame could be decompressed.
3193 */
3194 attribute_deprecated int avcodec_decode_audio2(AVCodecContext *avctx, int16_t *samples,
3195 int *frame_size_ptr,
3196 const uint8_t *buf, int buf_size);
3197 #endif
3198
3199 /**
3200 * Decodes the audio frame of size avpkt->size from avpkt->data into samples.
3201 * Some decoders may support multiple frames in a single AVPacket, such
3202 * decoders would then just decode the first frame.
3203 * If no frame
3204 * could be decompressed, frame_size_ptr is zero. Otherwise, it is the
3205 * decompressed frame size in bytes.
3206 *
3207 * @warning You must set frame_size_ptr to the allocated size of the
3208 * output buffer before calling avcodec_decode_audio3().
3209 *
3210 * @warning The input buffer must be FF_INPUT_BUFFER_PADDING_SIZE larger than
3211 * the actual read bytes because some optimized bitstream readers read 32 or 64
3212 * bits at once and could read over the end.
3213 *
3214 * @warning The end of the input buffer avpkt->data should be set to 0 to ensure that
3215 * no overreading happens for damaged MPEG streams.
3216 *
3217 * @note You might have to align the input buffer avpkt->data and output buffer
3218 * samples. The alignment requirements depend on the CPU: On some CPUs it isn't
3219 * necessary at all, on others it won't work at all if not aligned and on others
3220 * it will work but it will have an impact on performance.
3221 *
3222 * In practice, avpkt->data should have 4 byte alignment at minimum and
3223 * samples should be 16 byte aligned unless the CPU doesn't need it
3224 * (AltiVec and SSE do).
3225 *
3226 * @param avctx the codec context
3227 * @param[out] samples the output buffer, sample type in avctx->sample_fmt
3228 * @param[in,out] frame_size_ptr the output buffer size in bytes
3229 * @param[in] avpkt The input AVPacket containing the input buffer.
3230 * You can create such packet with av_init_packet() and by then setting
3231 * data and size, some decoders might in addition need other fields.
3232 * All decoders are designed to use the least fields possible though.
3233 * @return On error a negative value is returned, otherwise the number of bytes
3234 * used or zero if no frame could be decompressed.
3235 */
3236 int avcodec_decode_audio3(AVCodecContext *avctx, int16_t *samples,
3237 int *frame_size_ptr,
3238 AVPacket *avpkt);
3239
3240 #if LIBAVCODEC_VERSION_MAJOR < 53
3241 /**
3242 * Decodes a video frame from buf into picture.
3243 * Wrapper function which calls avcodec_decode_video2.
3244 *
3245 * @deprecated Use avcodec_decode_video2 instead.
3246 * @param avctx the codec context
3247 * @param[out] picture The AVFrame in which the decoded video frame will be stored.
3248 * @param[in] buf the input buffer
3249 * @param[in] buf_size the size of the input buffer in bytes
3250 * @param[in,out] got_picture_ptr Zero if no frame could be decompressed, otherwise, it is nonzero.
3251 * @return On error a negative value is returned, otherwise the number of bytes
3252 * used or zero if no frame could be decompressed.
3253 */
3254 attribute_deprecated int avcodec_decode_video(AVCodecContext *avctx, AVFrame *picture,
3255 int *got_picture_ptr,
3256 const uint8_t *buf, int buf_size);
3257 #endif
3258
3259 /**
3260 * Decodes the video frame of size avpkt->size from avpkt->data into picture.
3261 * Some decoders may support multiple frames in a single AVPacket, such
3262 * decoders would then just decode the first frame.
3263 *
3264 * @warning The input buffer must be FF_INPUT_BUFFER_PADDING_SIZE larger than
3265 * the actual read bytes because some optimized bitstream readers read 32 or 64
3266 * bits at once and could read over the end.
3267 *
3268 * @warning The end of the input buffer buf should be set to 0 to ensure that
3269 * no overreading happens for damaged MPEG streams.
3270 *
3271 * @note You might have to align the input buffer avpkt->data.
3272 * The alignment requirements depend on the CPU: on some CPUs it isn't
3273 * necessary at all, on others it won't work at all if not aligned and on others
3274 * it will work but it will have an impact on performance.
3275 *
3276 * In practice, avpkt->data should have 4 byte alignment at minimum.
3277 *
3278 * @note Some codecs have a delay between input and output, these need to be
3279 * feeded with avpkt->data=NULL, avpkt->size=0 at the end to return the remaining frames.
3280 *
3281 * @param avctx the codec context
3282 * @param[out] picture The AVFrame in which the decoded video frame will be stored.
3283 * @param[in] avpkt The input AVpacket containing the input buffer.
3284 * You can create such packet with av_init_packet() and by then setting
3285 * data and size, some decoders might in addition need other fields like
3286 * flags&PKT_FLAG_KEY. All decoders are designed to use the least
3287 * fields possible.
3288 * @param[in,out] got_picture_ptr Zero if no frame could be decompressed, otherwise, it is nonzero.
3289 * @return On error a negative value is returned, otherwise the number of bytes
3290 * used or zero if no frame could be decompressed.
3291 */
3292 int avcodec_decode_video2(AVCodecContext *avctx, AVFrame *picture,
3293 int *got_picture_ptr,
3294 AVPacket *avpkt);
3295
3296 #if LIBAVCODEC_VERSION_MAJOR < 53
3297 /* Decode a subtitle message. Return -1 if error, otherwise return the
3298 * number of bytes used. If no subtitle could be decompressed,
3299 * got_sub_ptr is zero. Otherwise, the subtitle is stored in *sub. */
3300 attribute_deprecated int avcodec_decode_subtitle(AVCodecContext *avctx, AVSubtitle *sub,
3301 int *got_sub_ptr,
3302 const uint8_t *buf, int buf_size);
3303 #endif
3304
3305 /**
3306 * Decodes a subtitle message.
3307 * Returns a negative value on error, otherwise returns the number of bytes used.
3308 * If no subtitle could be decompressed, got_sub_ptr is zero.
3309 * Otherwise, the subtitle is stored in *sub.
3310 *
3311 * @param avctx the codec context
3312 * @param[out] sub The AVSubtitle in which the decoded subtitle will be stored.
3313 * @param[in,out] got_sub_ptr Zero if no subtitle could be decompressed, otherwise, it is nonzero.
3314 * @param[in] avpkt The input AVPacket containing the input buffer.
3315 */
3316 int avcodec_decode_subtitle2(AVCodecContext *avctx, AVSubtitle *sub,
3317 int *got_sub_ptr,
3318 AVPacket *avpkt);
3319 int avcodec_parse_frame(AVCodecContext *avctx, uint8_t **pdata,
3320 int *data_size_ptr,
3321 uint8_t *buf, int buf_size);
3322
3323 /**
3324 * Encodes an audio frame from samples into buf.
3325 *
3326 * @note The output buffer should be at least FF_MIN_BUFFER_SIZE bytes large.
3327 * However, for PCM audio the user will know how much space is needed
3328 * because it depends on the value passed in buf_size as described
3329 * below. In that case a lower value can be used.
3330 *
3331 * @param avctx the codec context
3332 * @param[out] buf the output buffer
3333 * @param[in] buf_size the output buffer size
3334 * @param[in] samples the input buffer containing the samples
3335 * The number of samples read from this buffer is frame_size*channels,
3336 * both of which are defined in avctx.
3337 * For PCM audio the number of samples read from samples is equal to
3338 * buf_size * input_sample_size / output_sample_size.
3339 * @return On error a negative value is returned, on success zero or the number
3340 * of bytes used to encode the data read from the input buffer.
3341 */
3342 int avcodec_encode_audio(AVCodecContext *avctx, uint8_t *buf, int buf_size,
3343 const short *samples);
3344
3345 /**
3346 * Encodes a video frame from pict into buf.
3347 * The input picture should be
3348 * stored using a specific format, namely avctx.pix_fmt.
3349 *
3350 * @param avctx the codec context
3351 * @param[out] buf the output buffer for the bitstream of encoded frame
3352 * @param[in] buf_size the size of the output buffer in bytes
3353 * @param[in] pict the input picture to encode
3354 * @return On error a negative value is returned, on success zero or the number
3355 * of bytes used from the output buffer.
3356 */
3357 int avcodec_encode_video(AVCodecContext *avctx, uint8_t *buf, int buf_size,
3358 const AVFrame *pict);
3359 int avcodec_encode_subtitle(AVCodecContext *avctx, uint8_t *buf, int buf_size,
3360 const AVSubtitle *sub);
3361
3362 int avcodec_close(AVCodecContext *avctx);
3363
3364 /**
3365 * Register all the codecs, parsers and bitstream filters which were enabled at
3366 * configuration time. If you do not call this function you can select exactly
3367 * which formats you want to support, by using the individual registration
3368 * functions.
3369 *
3370 * @see avcodec_register
3371 * @see av_register_codec_parser
3372 * @see av_register_bitstream_filter
3373 */
3374 void avcodec_register_all(void);
3375
3376 /**
3377 * Flush buffers, should be called when seeking or when switching to a different stream.
3378 */
3379 void avcodec_flush_buffers(AVCodecContext *avctx);
3380
3381 void avcodec_default_free_buffers(AVCodecContext *s);
3382
3383 /* misc useful functions */
3384
3385 /**
3386 * Returns a single letter to describe the given picture type pict_type.
3387 *
3388 * @param[in] pict_type the picture type
3389 * @return A single character representing the picture type.
3390 */
3391 char av_get_pict_type_char(int pict_type);
3392
3393 /**
3394 * Returns codec bits per sample.
3395 *
3396 * @param[in] codec_id the codec
3397 * @return Number of bits per sample or zero if unknown for the given codec.
3398 */
3399 int av_get_bits_per_sample(enum CodecID codec_id);
3400
3401 /**
3402 * Returns sample format bits per sample.
3403 *
3404 * @param[in] sample_fmt the sample format
3405 * @return Number of bits per sample or zero if unknown for the given sample format.
3406 */
3407 int av_get_bits_per_sample_format(enum SampleFormat sample_fmt);
3408
3409 /* frame parsing */
3410 typedef struct AVCodecParserContext {
3411 void *priv_data;
3412 struct AVCodecParser *parser;
3413 int64_t frame_offset; /* offset of the current frame */
3414 int64_t cur_offset; /* current offset
3415 (incremented by each av_parser_parse()) */
3416 int64_t next_frame_offset; /* offset of the next frame */
3417 /* video info */
3418 int pict_type; /* XXX: Put it back in AVCodecContext. */
3419 /**
3420 * This field is used for proper frame duration computation in lavf.
3421 * It signals, how much longer the frame duration of the current frame
3422 * is compared to normal frame duration.
3423 *
3424 * frame_duration = (1 + repeat_pict) * time_base
3425 *
3426 * It is used by codecs like H.264 to display telecined material.
3427 */
3428 int repeat_pict; /* XXX: Put it back in AVCodecContext. */
3429 int64_t pts; /* pts of the current frame */
3430 int64_t dts; /* dts of the current frame */
3431
3432 /* private data */
3433 int64_t last_pts;
3434 int64_t last_dts;
3435 int fetch_timestamp;
3436
3437 #define AV_PARSER_PTS_NB 4
3438 int cur_frame_start_index;
3439 int64_t cur_frame_offset[AV_PARSER_PTS_NB];
3440 int64_t cur_frame_pts[AV_PARSER_PTS_NB];
3441 int64_t cur_frame_dts[AV_PARSER_PTS_NB];
3442
3443 int flags;
3444 #define PARSER_FLAG_COMPLETE_FRAMES 0x0001
3445
3446 int64_t offset; ///< byte offset from starting packet start
3447 int64_t cur_frame_end[AV_PARSER_PTS_NB];
3448
3449 /*!
3450 * Set by parser to 1 for key frames and 0 for non-key frames.
3451 * It is initialized to -1, so if the parser doesn't set this flag,
3452 * old-style fallback using FF_I_TYPE picture type as key frames
3453 * will be used.
3454 */
3455 int key_frame;
3456
3457 /**
3458 * Time difference in stream time base units from the pts of this
3459 * packet to the point at which the output from the decoder has converged
3460 * independent from the availability of previous frames. That is, the
3461 * frames are virtually identical no matter if decoding started from
3462 * the very first frame or from this keyframe.
3463 * Is AV_NOPTS_VALUE if unknown.
3464 * This field is not the display duration of the current frame.
3465 *
3466 * The purpose of this field is to allow seeking in streams that have no
3467 * keyframes in the conventional sense. It corresponds to the
3468 * recovery point SEI in H.264 and match_time_delta in NUT. It is also
3469 * essential for some types of subtitle streams to ensure that all
3470 * subtitles are correctly displayed after seeking.
3471 */
3472 int64_t convergence_duration;
3473
3474 // Timestamp generation support:
3475 /**
3476 * Synchronization point for start of timestamp generation.
3477 *
3478 * Set to >0 for sync point, 0 for no sync point and <0 for undefined
3479 * (default).
3480 *
3481 * For example, this corresponds to presence of H.264 buffering period
3482 * SEI message.
3483 */
3484 int dts_sync_point;
3485
3486 /**
3487 * Offset of the current timestamp against last timestamp sync point in
3488 * units of AVCodecContext.time_base.
3489 *
3490 * Set to INT_MIN when dts_sync_point unused. Otherwise, it must
3491 * contain a valid timestamp offset.
3492 *
3493 * Note that the timestamp of sync point has usually a nonzero
3494 * dts_ref_dts_delta, which refers to the previous sync point. Offset of
3495 * the next frame after timestamp sync point will be usually 1.
3496 *
3497 * For example, this corresponds to H.264 cpb_removal_delay.
3498 */
3499 int dts_ref_dts_delta;
3500
3501 /**
3502 * Presentation delay of current frame in units of AVCodecContext.time_base.
3503 *
3504 * Set to INT_MIN when dts_sync_point unused. Otherwise, it must
3505 * contain valid non-negative timestamp delta (presentation time of a frame
3506 * must not lie in the past).
3507 *
3508 * This delay represents the difference between decoding and presentation
3509 * time of the frame.
3510 *
3511 * For example, this corresponds to H.264 dpb_output_delay.
3512 */
3513 int pts_dts_delta;
3514
3515 /**
3516 * Position of the packet in file.
3517 *
3518 * Analogous to cur_frame_pts/dts
3519 */
3520 int64_t cur_frame_pos[AV_PARSER_PTS_NB];
3521
3522 /**
3523 * Byte position of currently parsed frame in stream.
3524 */
3525 int64_t pos;
3526
3527 /**
3528 * Previous frame byte position.
3529 */
3530 int64_t last_pos;
3531 } AVCodecParserContext;
3532
3533 typedef struct AVCodecParser {
3534 int codec_ids[5]; /* several codec IDs are permitted */
3535 int priv_data_size;
3536 int (*parser_init)(AVCodecParserContext *s);
3537 int (*parser_parse)(AVCodecParserContext *s,
3538 AVCodecContext *avctx,
3539 const uint8_t **poutbuf, int *poutbuf_size,
3540 const uint8_t *buf, int buf_size);
3541 void (*parser_close)(AVCodecParserContext *s);
3542 int (*split)(AVCodecContext *avctx, const uint8_t *buf, int buf_size);
3543 struct AVCodecParser *next;
3544 } AVCodecParser;
3545
3546 AVCodecParser *av_parser_next(AVCodecParser *c);
3547
3548 void av_register_codec_parser(AVCodecParser *parser);
3549 AVCodecParserContext *av_parser_init(int codec_id);
3550
3551 #if LIBAVCODEC_VERSION_MAJOR < 53
3552 attribute_deprecated
3553 int av_parser_parse(AVCodecParserContext *s,
3554 AVCodecContext *avctx,
3555 uint8_t **poutbuf, int *poutbuf_size,
3556 const uint8_t *buf, int buf_size,
3557 int64_t pts, int64_t dts);
3558 #endif
3559
3560 /**
3561 * Parse a packet.
3562 *
3563 * @param s parser context.
3564 * @param avctx codec context.
3565 * @param poutbuf set to pointer to parsed buffer or NULL if not yet finished.
3566 * @param poutbuf_size set to size of parsed buffer or zero if not yet finished.
3567 * @param buf input buffer.
3568 * @param buf_size input length, to signal EOF, this should be 0 (so that the last frame can be output).
3569 * @param pts input presentation timestamp.
3570 * @param dts input decoding timestamp.
3571 * @param pos input byte position in stream.
3572 * @return the number of bytes of the input bitstream used.
3573 *
3574 * Example:
3575 * @code
3576 * while(in_len){
3577 * len = av_parser_parse2(myparser, AVCodecContext, &data, &size,
3578 * in_data, in_len,
3579 * pts, dts, pos);
3580 * in_data += len;
3581 * in_len -= len;
3582 *
3583 * if(size)
3584 * decode_frame(data, size);
3585 * }
3586 * @endcode
3587 */
3588 int av_parser_parse2(AVCodecParserContext *s,
3589 AVCodecContext *avctx,
3590 uint8_t **poutbuf, int *poutbuf_size,
3591 const uint8_t *buf, int buf_size,
3592 int64_t pts, int64_t dts,
3593 int64_t pos);
3594
3595 int av_parser_change(AVCodecParserContext *s,
3596 AVCodecContext *avctx,
3597 uint8_t **poutbuf, int *poutbuf_size,
3598 const uint8_t *buf, int buf_size, int keyframe);
3599 void av_parser_close(AVCodecParserContext *s);
3600
3601
3602 typedef struct AVBitStreamFilterContext {
3603 void *priv_data;
3604 struct AVBitStreamFilter *filter;
3605 AVCodecParserContext *parser;
3606 struct AVBitStreamFilterContext *next;
3607 } AVBitStreamFilterContext;
3608
3609
3610 typedef struct AVBitStreamFilter {
3611 const char *name;
3612 int priv_data_size;
3613 int (*filter)(AVBitStreamFilterContext *bsfc,
3614 AVCodecContext *avctx, const char *args,
3615 uint8_t **poutbuf, int *poutbuf_size,
3616 const uint8_t *buf, int buf_size, int keyframe);
3617 void (*close)(AVBitStreamFilterContext *bsfc);
3618 struct AVBitStreamFilter *next;
3619 } AVBitStreamFilter;
3620
3621 void av_register_bitstream_filter(AVBitStreamFilter *bsf);
3622 AVBitStreamFilterContext *av_bitstream_filter_init(const char *name);
3623 int av_bitstream_filter_filter(AVBitStreamFilterContext *bsfc,
3624 AVCodecContext *avctx, const char *args,
3625 uint8_t **poutbuf, int *poutbuf_size,
3626 const uint8_t *buf, int buf_size, int keyframe);
3627 void av_bitstream_filter_close(AVBitStreamFilterContext *bsf);
3628
3629 AVBitStreamFilter *av_bitstream_filter_next(AVBitStreamFilter *f);
3630
3631 /* memory */
3632
3633 /**
3634 * Reallocates the given block if it is not large enough, otherwise it
3635 * does nothing.
3636 *
3637 * @see av_realloc
3638 */
3639 void *av_fast_realloc(void *ptr, unsigned int *size, unsigned int min_size);
3640
3641 /**
3642 * Allocates a buffer, reusing the given one if large enough.
3643 *
3644 * Contrary to av_fast_realloc the current buffer contents might not be
3645 * preserved and on error the old buffer is freed, thus no special
3646 * handling to avoid memleaks is necessary.
3647 *
3648 * @param ptr pointer to pointer to already allocated buffer, overwritten with pointer to new buffer
3649 * @param size size of the buffer *ptr points to
3650 * @param min_size minimum size of *ptr buffer after returning, *ptr will be NULL and
3651 * *size 0 if an error occurred.
3652 */
3653 void av_fast_malloc(void *ptr, unsigned int *size, unsigned int min_size);
3654
3655 /**
3656 * Copy image 'src' to 'dst'.
3657 */
3658 void av_picture_copy(AVPicture *dst, const AVPicture *src,
3659 enum PixelFormat pix_fmt, int width, int height);
3660
3661 /**
3662 * Crop image top and left side.
3663 */
3664 int av_picture_crop(AVPicture *dst, const AVPicture *src,
3665 enum PixelFormat pix_fmt, int top_band, int left_band);
3666
3667 /**
3668 * Pad image.
3669 */
3670 int av_picture_pad(AVPicture *dst, const AVPicture *src, int height, int width, enum PixelFormat pix_fmt,
3671 int padtop, int padbottom, int padleft, int padright, int *color);
3672
3673 unsigned int av_xiphlacing(unsigned char *s, unsigned int v);
3674
3675 /**
3676 * Parses str and put in width_ptr and height_ptr the detected values.
3677 *
3678 * @return 0 in case of a successful parsing, a negative value otherwise
3679 * @param[in] str the string to parse: it has to be a string in the format
3680 * <width>x<height> or a valid video frame size abbreviation.
3681 * @param[in,out] width_ptr pointer to the variable which will contain the detected
3682 * frame width value
3683 * @param[in,out] height_ptr pointer to the variable which will contain the detected
3684 * frame height value
3685 */
3686 int av_parse_video_frame_size(int *width_ptr, int *height_ptr, const char *str);
3687
3688 /**
3689 * Parses str and put in frame_rate the detected values.
3690 *
3691 * @return 0 in case of a successful parsing, a negative value otherwise
3692 * @param[in] str the string to parse: it has to be a string in the format
3693 * <frame_rate_num>/<frame_rate_den>, a float number or a valid video rate abbreviation
3694 * @param[in,out] frame_rate pointer to the AVRational which will contain the detected
3695 * frame rate
3696 */
3697 int av_parse_video_frame_rate(AVRational *frame_rate, const char *str);
3698
3699 /* error handling */
3700 #if EINVAL > 0
3701 #define AVERROR(e) (-(e)) /**< Returns a negative error code from a POSIX error code, to return from library functions. */
3702 #define AVUNERROR(e) (-(e)) /**< Returns a POSIX error code from a library function error return value. */
3703 #else
3704 /* Some platforms have E* and errno already negated. */
3705 #define AVERROR(e) (e)
3706 #define AVUNERROR(e) (e)
3707 #endif
3708 #define AVERROR_UNKNOWN AVERROR(EINVAL) /**< unknown error */
3709 #define AVERROR_IO AVERROR(EIO) /**< I/O error */
3710 #define AVERROR_NUMEXPECTED AVERROR(EDOM) /**< Number syntax expected in filename. */
3711 #define AVERROR_INVALIDDATA AVERROR(EINVAL) /**< invalid data found */
3712 #define AVERROR_NOMEM AVERROR(ENOMEM) /**< not enough memory */
3713 #define AVERROR_NOFMT AVERROR(EILSEQ) /**< unknown format */
3714 #define AVERROR_NOTSUPP AVERROR(ENOSYS) /**< Operation not supported. */
3715 #define AVERROR_NOENT AVERROR(ENOENT) /**< No such file or directory. */
3716 #define AVERROR_EOF AVERROR(EPIPE) /**< End of file. */
3717 #define AVERROR_PATCHWELCOME -MKTAG('P','A','W','E') /**< Not yet implemented in FFmpeg. Patches welcome. */
3718
3719 /**
3720 * Logs a generic warning message about a missing feature. This function is
3721 * intended to be used internally by FFmpeg (libavcodec, libavformat, etc.)
3722 * only, and would normally not be used by applications.
3723 * @param[in] avc a pointer to an arbitrary struct of which the first field is
3724 * a pointer to an AVClass struct
3725 * @param[in] feature string containing the name of the missing feature
3726 * @param[in] want_sample indicates if samples are wanted which exhibit this feature.
3727 * If want_sample is non-zero, additional verbage will be added to the log
3728 * message which tells the user how to report samples to the development
3729 * mailing list.
3730 */
3731 void av_log_missing_feature(void *avc, const char *feature, int want_sample);
3732
3733 /**
3734 * Logs a generic warning message asking for a sample. This function is
3735 * intended to be used internally by FFmpeg (libavcodec, libavformat, etc.)
3736 * only, and would normally not be used by applications.
3737 * @param[in] avc a pointer to an arbitrary struct of which the first field is
3738 * a pointer to an AVClass struct
3739 * @param[in] msg string containing an optional message, or NULL if no message
3740 */
3741 void av_log_ask_for_sample(void *avc, const char *msg);
3742
3743 /**
3744 * Registers the hardware accelerator hwaccel.
3745 */
3746 void av_register_hwaccel(AVHWAccel *hwaccel);
3747
3748 /**
3749 * If hwaccel is NULL, returns the first registered hardware accelerator,
3750 * if hwaccel is non-NULL, returns the next registered hardware accelerator
3751 * after hwaccel, or NULL if hwaccel is the last one.
3752 */
3753 AVHWAccel *av_hwaccel_next(AVHWAccel *hwaccel);
3754
3755
3756 /**
3757 * Lock operation used by lockmgr
3758 */
3759 enum AVLockOp {
3760 AV_LOCK_CREATE, ///< Create a mutex
3761 AV_LOCK_OBTAIN, ///< Lock the mutex
3762 AV_LOCK_RELEASE, ///< Unlock the mutex
3763 AV_LOCK_DESTROY, ///< Free mutex resources
3764 };
3765
3766 /**
3767 * Register a user provided lock manager supporting the operations
3768 * specified by AVLockOp. mutex points to a (void *) where the
3769 * lockmgr should store/get a pointer to a user allocated mutex. It's
3770 * NULL upon AV_LOCK_CREATE and != NULL for all other ops.
3771 *
3772 * @param cb User defined callback. Note: FFmpeg may invoke calls to this
3773 * callback during the call to av_lockmgr_register().
3774 * Thus, the application must be prepared