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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 66
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/* some function declarations not used in rockbox use it */
51enum PixelFormat {
52 we_can_only_play_mpeg_video_anyway = -1
53};
54
55/**
56 * Identifies the syntax and semantics of the bitstream.
57 * The principle is roughly:
58 * Two decoders with the same ID can decode the same streams.
59 * Two encoders with the same ID can encode compatible streams.
60 * There may be slight deviations from the principle due to implementation
61 * details.
62 *
63 * If you add a codec ID to this list, add it so that
64 * 1. no value of a existing codec ID changes (that would break ABI),
65 * 2. it is as close as possible to similar codecs.
66 */
67enum CodecID {
68 CODEC_ID_NONE,
69
70 /* video codecs */
71 CODEC_ID_MPEG1VIDEO,
72 CODEC_ID_MPEG2VIDEO, ///< preferred ID for MPEG-1/2 video decoding
73 CODEC_ID_MPEG2VIDEO_XVMC,
74 CODEC_ID_H261,
75 CODEC_ID_H263,
76 CODEC_ID_RV10,
77 CODEC_ID_RV20,
78 CODEC_ID_MJPEG,
79 CODEC_ID_MJPEGB,
80 CODEC_ID_LJPEG,
81 CODEC_ID_SP5X,
82 CODEC_ID_JPEGLS,
83 CODEC_ID_MPEG4,
84 CODEC_ID_RAWVIDEO,
85 CODEC_ID_MSMPEG4V1,
86 CODEC_ID_MSMPEG4V2,
87 CODEC_ID_MSMPEG4V3,
88 CODEC_ID_WMV1,
89 CODEC_ID_WMV2,
90 CODEC_ID_H263P,
91 CODEC_ID_H263I,
92 CODEC_ID_FLV1,
93 CODEC_ID_SVQ1,
94 CODEC_ID_SVQ3,
95 CODEC_ID_DVVIDEO,
96 CODEC_ID_HUFFYUV,
97 CODEC_ID_CYUV,
98 CODEC_ID_H264,
99 CODEC_ID_INDEO3,
100 CODEC_ID_VP3,
101 CODEC_ID_THEORA,
102 CODEC_ID_ASV1,
103 CODEC_ID_ASV2,
104 CODEC_ID_FFV1,
105 CODEC_ID_4XM,
106 CODEC_ID_VCR1,
107 CODEC_ID_CLJR,
108 CODEC_ID_MDEC,
109 CODEC_ID_ROQ,
110 CODEC_ID_INTERPLAY_VIDEO,
111 CODEC_ID_XAN_WC3,
112 CODEC_ID_XAN_WC4,
113 CODEC_ID_RPZA,
114 CODEC_ID_CINEPAK,
115 CODEC_ID_WS_VQA,
116 CODEC_ID_MSRLE,
117 CODEC_ID_MSVIDEO1,
118 CODEC_ID_IDCIN,
119 CODEC_ID_8BPS,
120 CODEC_ID_SMC,
121 CODEC_ID_FLIC,
122 CODEC_ID_TRUEMOTION1,
123 CODEC_ID_VMDVIDEO,
124 CODEC_ID_MSZH,
125 CODEC_ID_ZLIB,
126 CODEC_ID_QTRLE,
127 CODEC_ID_SNOW,
128 CODEC_ID_TSCC,
129 CODEC_ID_ULTI,
130 CODEC_ID_QDRAW,
131 CODEC_ID_VIXL,
132 CODEC_ID_QPEG,
133#if LIBAVCODEC_VERSION_MAJOR < 53
134 CODEC_ID_XVID,
135#endif
136 CODEC_ID_PNG,
137 CODEC_ID_PPM,
138 CODEC_ID_PBM,
139 CODEC_ID_PGM,
140 CODEC_ID_PGMYUV,
141 CODEC_ID_PAM,
142 CODEC_ID_FFVHUFF,
143 CODEC_ID_RV30,
144 CODEC_ID_RV40,
145 CODEC_ID_VC1,
146 CODEC_ID_WMV3,
147 CODEC_ID_LOCO,
148 CODEC_ID_WNV1,
149 CODEC_ID_AASC,
150 CODEC_ID_INDEO2,
151 CODEC_ID_FRAPS,
152 CODEC_ID_TRUEMOTION2,
153 CODEC_ID_BMP,
154 CODEC_ID_CSCD,
155 CODEC_ID_MMVIDEO,
156 CODEC_ID_ZMBV,
157 CODEC_ID_AVS,
158 CODEC_ID_SMACKVIDEO,
159 CODEC_ID_NUV,
160 CODEC_ID_KMVC,
161 CODEC_ID_FLASHSV,
162 CODEC_ID_CAVS,
163 CODEC_ID_JPEG2000,
164 CODEC_ID_VMNC,
165 CODEC_ID_VP5,
166 CODEC_ID_VP6,
167 CODEC_ID_VP6F,
168 CODEC_ID_TARGA,
169 CODEC_ID_DSICINVIDEO,
170 CODEC_ID_TIERTEXSEQVIDEO,
171 CODEC_ID_TIFF,
172 CODEC_ID_GIF,
173 CODEC_ID_FFH264,
174 CODEC_ID_DXA,
175 CODEC_ID_DNXHD,
176 CODEC_ID_THP,
177 CODEC_ID_SGI,
178 CODEC_ID_C93,
179 CODEC_ID_BETHSOFTVID,
180 CODEC_ID_PTX,
181 CODEC_ID_TXD,
182 CODEC_ID_VP6A,
183 CODEC_ID_AMV,
184 CODEC_ID_VB,
185 CODEC_ID_PCX,
186 CODEC_ID_SUNRAST,
187 CODEC_ID_INDEO4,
188 CODEC_ID_INDEO5,
189 CODEC_ID_MIMIC,
190 CODEC_ID_RL2,
191 CODEC_ID_8SVX_EXP,
192 CODEC_ID_8SVX_FIB,
193 CODEC_ID_ESCAPE124,
194 CODEC_ID_DIRAC,
195 CODEC_ID_BFI,
196 CODEC_ID_CMV,
197 CODEC_ID_MOTIONPIXELS,
198 CODEC_ID_TGV,
199 CODEC_ID_TGQ,
200 CODEC_ID_TQI,
201 CODEC_ID_AURA,
202 CODEC_ID_AURA2,
203 CODEC_ID_V210X,
204 CODEC_ID_TMV,
205 CODEC_ID_V210,
206 CODEC_ID_DPX,
207 CODEC_ID_MAD,
208 CODEC_ID_FRWU,
209 CODEC_ID_FLASHSV2,
210 CODEC_ID_CDGRAPHICS,
211 CODEC_ID_R210,
212 CODEC_ID_ANM,
213 CODEC_ID_BINKVIDEO,
214 CODEC_ID_IFF_ILBM,
215 CODEC_ID_IFF_BYTERUN1,
216 CODEC_ID_KGV1,
217 CODEC_ID_YOP,
218
219 /* various PCM "codecs" */
220 CODEC_ID_PCM_S16LE= 0x10000,
221 CODEC_ID_PCM_S16BE,
222 CODEC_ID_PCM_U16LE,
223 CODEC_ID_PCM_U16BE,
224 CODEC_ID_PCM_S8,
225 CODEC_ID_PCM_U8,
226 CODEC_ID_PCM_MULAW,
227 CODEC_ID_PCM_ALAW,
228 CODEC_ID_PCM_S32LE,
229 CODEC_ID_PCM_S32BE,
230 CODEC_ID_PCM_U32LE,
231 CODEC_ID_PCM_U32BE,
232 CODEC_ID_PCM_S24LE,
233 CODEC_ID_PCM_S24BE,
234 CODEC_ID_PCM_U24LE,
235 CODEC_ID_PCM_U24BE,
236 CODEC_ID_PCM_S24DAUD,
237 CODEC_ID_PCM_ZORK,
238 CODEC_ID_PCM_S16LE_PLANAR,
239 CODEC_ID_PCM_DVD,
240 CODEC_ID_PCM_F32BE,
241 CODEC_ID_PCM_F32LE,
242 CODEC_ID_PCM_F64BE,
243 CODEC_ID_PCM_F64LE,
244 CODEC_ID_PCM_BLURAY,
245
246 /* various ADPCM codecs */
247 CODEC_ID_ADPCM_IMA_QT= 0x11000,
248 CODEC_ID_ADPCM_IMA_WAV,
249 CODEC_ID_ADPCM_IMA_DK3,
250 CODEC_ID_ADPCM_IMA_DK4,
251 CODEC_ID_ADPCM_IMA_WS,
252 CODEC_ID_ADPCM_IMA_SMJPEG,
253 CODEC_ID_ADPCM_MS,
254 CODEC_ID_ADPCM_4XM,
255 CODEC_ID_ADPCM_XA,
256 CODEC_ID_ADPCM_ADX,
257 CODEC_ID_ADPCM_EA,
258 CODEC_ID_ADPCM_G726,
259 CODEC_ID_ADPCM_CT,
260 CODEC_ID_ADPCM_SWF,
261 CODEC_ID_ADPCM_YAMAHA,
262 CODEC_ID_ADPCM_SBPRO_4,
263 CODEC_ID_ADPCM_SBPRO_3,
264 CODEC_ID_ADPCM_SBPRO_2,
265 CODEC_ID_ADPCM_THP,
266 CODEC_ID_ADPCM_IMA_AMV,
267 CODEC_ID_ADPCM_EA_R1,
268 CODEC_ID_ADPCM_EA_R3,
269 CODEC_ID_ADPCM_EA_R2,
270 CODEC_ID_ADPCM_IMA_EA_SEAD,
271 CODEC_ID_ADPCM_IMA_EA_EACS,
272 CODEC_ID_ADPCM_EA_XAS,
273 CODEC_ID_ADPCM_EA_MAXIS_XA,
274 CODEC_ID_ADPCM_IMA_ISS,
275
276 /* AMR */
277 CODEC_ID_AMR_NB= 0x12000,
278 CODEC_ID_AMR_WB,
279
280 /* RealAudio codecs*/
281 CODEC_ID_RA_144= 0x13000,
282 CODEC_ID_RA_288,
283
284 /* various DPCM codecs */
285 CODEC_ID_ROQ_DPCM= 0x14000,
286 CODEC_ID_INTERPLAY_DPCM,
287 CODEC_ID_XAN_DPCM,
288 CODEC_ID_SOL_DPCM,
289
290 /* audio codecs */
291 CODEC_ID_MP2= 0x15000,
292 CODEC_ID_MP3, ///< preferred ID for decoding MPEG audio layer 1, 2 or 3
293 CODEC_ID_AAC,
294 CODEC_ID_AC3,
295 CODEC_ID_DTS,
296 CODEC_ID_VORBIS,
297 CODEC_ID_DVAUDIO,
298 CODEC_ID_WMAV1,
299 CODEC_ID_WMAV2,
300 CODEC_ID_MACE3,
301 CODEC_ID_MACE6,
302 CODEC_ID_VMDAUDIO,
303 CODEC_ID_SONIC,
304 CODEC_ID_SONIC_LS,
305 CODEC_ID_FLAC,
306 CODEC_ID_MP3ADU,
307 CODEC_ID_MP3ON4,
308 CODEC_ID_SHORTEN,
309 CODEC_ID_ALAC,
310 CODEC_ID_WESTWOOD_SND1,
311 CODEC_ID_GSM, ///< as in Berlin toast format
312 CODEC_ID_QDM2,
313 CODEC_ID_COOK,
314 CODEC_ID_TRUESPEECH,
315 CODEC_ID_TTA,
316 CODEC_ID_SMACKAUDIO,
317 CODEC_ID_QCELP,
318 CODEC_ID_WAVPACK,
319 CODEC_ID_DSICINAUDIO,
320 CODEC_ID_IMC,
321 CODEC_ID_MUSEPACK7,
322 CODEC_ID_MLP,
323 CODEC_ID_GSM_MS, /* as found in WAV */
324 CODEC_ID_ATRAC3,
325 CODEC_ID_VOXWARE,
326 CODEC_ID_APE,
327 CODEC_ID_NELLYMOSER,
328 CODEC_ID_MUSEPACK8,
329 CODEC_ID_SPEEX,
330 CODEC_ID_WMAVOICE,
331 CODEC_ID_WMAPRO,
332 CODEC_ID_WMALOSSLESS,
333 CODEC_ID_ATRAC3P,
334 CODEC_ID_EAC3,
335 CODEC_ID_SIPR,
336 CODEC_ID_MP1,
337 CODEC_ID_TWINVQ,
338 CODEC_ID_TRUEHD,
339 CODEC_ID_MP4ALS,
340 CODEC_ID_ATRAC1,
341 CODEC_ID_BINKAUDIO_RDFT,
342 CODEC_ID_BINKAUDIO_DCT,
343
344 /* subtitle codecs */
345 CODEC_ID_DVD_SUBTITLE= 0x17000,
346 CODEC_ID_DVB_SUBTITLE,
347 CODEC_ID_TEXT, ///< raw UTF-8 text
348 CODEC_ID_XSUB,
349 CODEC_ID_SSA,
350 CODEC_ID_MOV_TEXT,
351 CODEC_ID_HDMV_PGS_SUBTITLE,
352 CODEC_ID_DVB_TELETEXT,
353
354 /* other specific kind of codecs (generally used for attachments) */
355 CODEC_ID_TTF= 0x18000,
356
357 CODEC_ID_PROBE= 0x19000, ///< codec_id is not known (like CODEC_ID_NONE) but lavf should attempt to identify it
358
359 CODEC_ID_MPEG2TS= 0x20000, /**< _FAKE_ codec to indicate a raw MPEG-2 TS
360 * stream (only used by libavformat) */
361};
362
363#if LIBAVCODEC_VERSION_MAJOR < 53
364#define CodecType AVMediaType
365
366#define CODEC_TYPE_UNKNOWN AVMEDIA_TYPE_UNKNOWN
367#define CODEC_TYPE_VIDEO AVMEDIA_TYPE_VIDEO
368#define CODEC_TYPE_AUDIO AVMEDIA_TYPE_AUDIO
369#define CODEC_TYPE_DATA AVMEDIA_TYPE_DATA
370#define CODEC_TYPE_SUBTITLE AVMEDIA_TYPE_SUBTITLE
371#define CODEC_TYPE_ATTACHMENT AVMEDIA_TYPE_ATTACHMENT
372#define CODEC_TYPE_NB AVMEDIA_TYPE_NB
373#endif
374
375/**
376 * all in native-endian format
377 */
378enum SampleFormat {
379 SAMPLE_FMT_NONE = -1,
380 SAMPLE_FMT_U8, ///< unsigned 8 bits
381 SAMPLE_FMT_S16, ///< signed 16 bits
382 SAMPLE_FMT_S32, ///< signed 32 bits
383 SAMPLE_FMT_FLT, ///< float
384 SAMPLE_FMT_DBL, ///< double
385 SAMPLE_FMT_NB ///< Number of sample formats. DO NOT USE if dynamically linking to libavcodec
386};
387
388/* Audio channel masks */
389#define CH_FRONT_LEFT 0x00000001
390#define CH_FRONT_RIGHT 0x00000002
391#define CH_FRONT_CENTER 0x00000004
392#define CH_LOW_FREQUENCY 0x00000008
393#define CH_BACK_LEFT 0x00000010
394#define CH_BACK_RIGHT 0x00000020
395#define CH_FRONT_LEFT_OF_CENTER 0x00000040
396#define CH_FRONT_RIGHT_OF_CENTER 0x00000080
397#define CH_BACK_CENTER 0x00000100
398#define CH_SIDE_LEFT 0x00000200
399#define CH_SIDE_RIGHT 0x00000400
400#define CH_TOP_CENTER 0x00000800
401#define CH_TOP_FRONT_LEFT 0x00001000
402#define CH_TOP_FRONT_CENTER 0x00002000
403#define CH_TOP_FRONT_RIGHT 0x00004000
404#define CH_TOP_BACK_LEFT 0x00008000
405#define CH_TOP_BACK_CENTER 0x00010000
406#define CH_TOP_BACK_RIGHT 0x00020000
407#define CH_STEREO_LEFT 0x20000000 ///< Stereo downmix.
408#define CH_STEREO_RIGHT 0x40000000 ///< See CH_STEREO_LEFT.
409
410/** Channel mask value used for AVCodecContext.request_channel_layout
411 to indicate that the user requests the channel order of the decoder output
412 to be the native codec channel order. */
413#define CH_LAYOUT_NATIVE 0x8000000000000000LL
414
415/* Audio channel convenience macros */
416#define CH_LAYOUT_MONO (CH_FRONT_CENTER)
417#define CH_LAYOUT_STEREO (CH_FRONT_LEFT|CH_FRONT_RIGHT)
418#define CH_LAYOUT_2_1 (CH_LAYOUT_STEREO|CH_BACK_CENTER)
419#define CH_LAYOUT_SURROUND (CH_LAYOUT_STEREO|CH_FRONT_CENTER)
420#define CH_LAYOUT_4POINT0 (CH_LAYOUT_SURROUND|CH_BACK_CENTER)
421#define CH_LAYOUT_2_2 (CH_LAYOUT_STEREO|CH_SIDE_LEFT|CH_SIDE_RIGHT)
422#define CH_LAYOUT_QUAD (CH_LAYOUT_STEREO|CH_BACK_LEFT|CH_BACK_RIGHT)
423#define CH_LAYOUT_5POINT0 (CH_LAYOUT_SURROUND|CH_SIDE_LEFT|CH_SIDE_RIGHT)
424#define CH_LAYOUT_5POINT1 (CH_LAYOUT_5POINT0|CH_LOW_FREQUENCY)
425#define CH_LAYOUT_5POINT0_BACK (CH_LAYOUT_SURROUND|CH_BACK_LEFT|CH_BACK_RIGHT)
426#define CH_LAYOUT_5POINT1_BACK (CH_LAYOUT_5POINT0_BACK|CH_LOW_FREQUENCY)
427#define CH_LAYOUT_7POINT0 (CH_LAYOUT_5POINT0|CH_BACK_LEFT|CH_BACK_RIGHT)
428#define CH_LAYOUT_7POINT1 (CH_LAYOUT_5POINT1|CH_BACK_LEFT|CH_BACK_RIGHT)
429#define CH_LAYOUT_7POINT1_WIDE (CH_LAYOUT_5POINT1_BACK|\
430 CH_FRONT_LEFT_OF_CENTER|CH_FRONT_RIGHT_OF_CENTER)
431#define CH_LAYOUT_STEREO_DOWNMIX (CH_STEREO_LEFT|CH_STEREO_RIGHT)
432
433/* in bytes */
434#define AVCODEC_MAX_AUDIO_FRAME_SIZE 192000 // 1 second of 48khz 32bit audio
435
436/**
437 * Required number of additionally allocated bytes at the end of the input bitstream for decoding.
438 * This is mainly needed because some optimized bitstream readers read
439 * 32 or 64 bit at once and could read over the end.<br>
440 * Note: If the first 23 bits of the additional bytes are not 0, then damaged
441 * MPEG bitstreams could cause overread and segfault.
442 */
443#define FF_INPUT_BUFFER_PADDING_SIZE 8
444
445/**
446 * minimum encoding buffer size
447 * Used to avoid some checks during header writing.
448 */
449#define FF_MIN_BUFFER_SIZE 16384
450
451
452/**
453 * motion estimation type.
454 */
455enum Motion_Est_ID {
456 ME_ZERO = 1, ///< no search, that is use 0,0 vector whenever one is needed
457 ME_FULL,
458 ME_LOG,
459 ME_PHODS,
460 ME_EPZS, ///< enhanced predictive zonal search
461 ME_X1, ///< reserved for experiments
462 ME_HEX, ///< hexagon based search
463 ME_UMH, ///< uneven multi-hexagon search
464 ME_ITER, ///< iterative search
465 ME_TESA, ///< transformed exhaustive search algorithm
466};
467
468enum AVDiscard{
469 /* We leave some space between them for extensions (drop some
470 * keyframes for intra-only or drop just some bidir frames). */
471 AVDISCARD_NONE =-16, ///< discard nothing
472 AVDISCARD_DEFAULT= 0, ///< discard useless packets like 0 size packets in avi
473 AVDISCARD_NONREF = 8, ///< discard all non reference
474 AVDISCARD_BIDIR = 16, ///< discard all bidirectional frames
475 AVDISCARD_NONKEY = 32, ///< discard all frames except keyframes
476 AVDISCARD_ALL = 48, ///< discard all
477};
478
479enum AVColorPrimaries{
480 AVCOL_PRI_BT709 =1, ///< also ITU-R BT1361 / IEC 61966-2-4 / SMPTE RP177 Annex B
481 AVCOL_PRI_UNSPECIFIED=2,
482 AVCOL_PRI_BT470M =4,
483 AVCOL_PRI_BT470BG =5, ///< also ITU-R BT601-6 625 / ITU-R BT1358 625 / ITU-R BT1700 625 PAL & SECAM
484 AVCOL_PRI_SMPTE170M =6, ///< also ITU-R BT601-6 525 / ITU-R BT1358 525 / ITU-R BT1700 NTSC
485 AVCOL_PRI_SMPTE240M =7, ///< functionally identical to above
486 AVCOL_PRI_FILM =8,
487 AVCOL_PRI_NB , ///< Not part of ABI
488};
489
490enum AVColorTransferCharacteristic{
491 AVCOL_TRC_BT709 =1, ///< also ITU-R BT1361
492 AVCOL_TRC_UNSPECIFIED=2,
493 AVCOL_TRC_GAMMA22 =4, ///< also ITU-R BT470M / ITU-R BT1700 625 PAL & SECAM
494 AVCOL_TRC_GAMMA28 =5, ///< also ITU-R BT470BG
495 AVCOL_TRC_NB , ///< Not part of ABI
496};
497
498enum AVColorSpace{
499 AVCOL_SPC_RGB =0,
500 AVCOL_SPC_BT709 =1, ///< also ITU-R BT1361 / IEC 61966-2-4 xvYCC709 / SMPTE RP177 Annex B
501 AVCOL_SPC_UNSPECIFIED=2,
502 AVCOL_SPC_FCC =4,
503 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
504 AVCOL_SPC_SMPTE170M =6, ///< also ITU-R BT601-6 525 / ITU-R BT1358 525 / ITU-R BT1700 NTSC / functionally identical to above
505 AVCOL_SPC_SMPTE240M =7,
506 AVCOL_SPC_NB , ///< Not part of ABI
507};
508
509enum AVColorRange{
510 AVCOL_RANGE_UNSPECIFIED=0,
511 AVCOL_RANGE_MPEG =1, ///< the normal 219*2^(n-8) "MPEG" YUV ranges
512 AVCOL_RANGE_JPEG =2, ///< the normal 2^n-1 "JPEG" YUV ranges
513 AVCOL_RANGE_NB , ///< Not part of ABI
514};
515
516/**
517 * X X 3 4 X X are luma samples,
518 * 1 2 1-6 are possible chroma positions
519 * X X 5 6 X 0 is undefined/unknown position
520 */
521enum AVChromaLocation{
522 AVCHROMA_LOC_UNSPECIFIED=0,
523 AVCHROMA_LOC_LEFT =1, ///< mpeg2/4, h264 default
524 AVCHROMA_LOC_CENTER =2, ///< mpeg1, jpeg, h263
525 AVCHROMA_LOC_TOPLEFT =3, ///< DV
526 AVCHROMA_LOC_TOP =4,
527 AVCHROMA_LOC_BOTTOMLEFT =5,
528 AVCHROMA_LOC_BOTTOM =6,
529 AVCHROMA_LOC_NB , ///< Not part of ABI
530};
531
532typedef struct RcOverride{
533 int start_frame;
534 int end_frame;
535 int qscale; // If this is 0 then quality_factor will be used instead.
536 float quality_factor;
537} RcOverride;
538
539#define FF_MAX_B_FRAMES 16
540
541/* encoding support
542 These flags can be passed in AVCodecContext.flags before initialization.
543 Note: Not everything is supported yet.
544*/
545
546#define CODEC_FLAG_QSCALE 0x0002 ///< Use fixed qscale.
547#define CODEC_FLAG_4MV 0x0004 ///< 4 MV per MB allowed / advanced prediction for H.263.
548#define CODEC_FLAG_QPEL 0x0010 ///< Use qpel MC.
549#define CODEC_FLAG_GMC 0x0020 ///< Use GMC.
550#define CODEC_FLAG_MV0 0x0040 ///< Always try a MB with MV=<0,0>.
551#define CODEC_FLAG_PART 0x0080 ///< Use data partitioning.
552/**
553 * The parent program guarantees that the input for B-frames containing
554 * streams is not written to for at least s->max_b_frames+1 frames, if
555 * this is not set the input will be copied.
556 */
557#define CODEC_FLAG_INPUT_PRESERVED 0x0100
558#define CODEC_FLAG_PASS1 0x0200 ///< Use internal 2pass ratecontrol in first pass mode.
559#define CODEC_FLAG_PASS2 0x0400 ///< Use internal 2pass ratecontrol in second pass mode.
560#define CODEC_FLAG_EXTERN_HUFF 0x1000 ///< Use external Huffman table (for MJPEG).
561#define CODEC_FLAG_GRAY 0x2000 ///< Only decode/encode grayscale.
562#define CODEC_FLAG_EMU_EDGE 0x4000 ///< Don't draw edges.
563#define CODEC_FLAG_PSNR 0x8000 ///< error[?] variables will be set during encoding.
564#define CODEC_FLAG_TRUNCATED 0x00010000 /** Input bitstream might be truncated at a random
565 location instead of only at frame boundaries. */
566#define CODEC_FLAG_NORMALIZE_AQP 0x00020000 ///< Normalize adaptive quantization.
567#define CODEC_FLAG_INTERLACED_DCT 0x00040000 ///< Use interlaced DCT.
568#define CODEC_FLAG_LOW_DELAY 0x00080000 ///< Force low delay.
569#define CODEC_FLAG_ALT_SCAN 0x00100000 ///< Use alternate scan.
570#define CODEC_FLAG_GLOBAL_HEADER 0x00400000 ///< Place global headers in extradata instead of every keyframe.
571#define CODEC_FLAG_BITEXACT 0x00800000 ///< Use only bitexact stuff (except (I)DCT).
572/* Fx : Flag for h263+ extra options */
573#define CODEC_FLAG_AC_PRED 0x01000000 ///< H.263 advanced intra coding / MPEG-4 AC prediction
574#define CODEC_FLAG_H263P_UMV 0x02000000 ///< unlimited motion vector
575#define CODEC_FLAG_CBP_RD 0x04000000 ///< Use rate distortion optimization for cbp.
576#define CODEC_FLAG_QP_RD 0x08000000 ///< Use rate distortion optimization for qp selectioon.
577#define CODEC_FLAG_H263P_AIV 0x00000008 ///< H.263 alternative inter VLC
578#define CODEC_FLAG_OBMC 0x00000001 ///< OBMC
579#define CODEC_FLAG_LOOP_FILTER 0x00000800 ///< loop filter
580#define CODEC_FLAG_H263P_SLICE_STRUCT 0x10000000
581#define CODEC_FLAG_INTERLACED_ME 0x20000000 ///< interlaced motion estimation
582#define CODEC_FLAG_SVCD_SCAN_OFFSET 0x40000000 ///< Will reserve space for SVCD scan offset user data.
583#define CODEC_FLAG_CLOSED_GOP 0x80000000
584#define CODEC_FLAG2_FAST 0x00000001 ///< Allow non spec compliant speedup tricks.
585#define CODEC_FLAG2_STRICT_GOP 0x00000002 ///< Strictly enforce GOP size.
586#define CODEC_FLAG2_NO_OUTPUT 0x00000004 ///< Skip bitstream encoding.
587#define CODEC_FLAG2_LOCAL_HEADER 0x00000008 ///< Place global headers at every keyframe instead of in extradata.
588#define CODEC_FLAG2_BPYRAMID 0x00000010 ///< H.264 allow B-frames to be used as references.
589#define CODEC_FLAG2_WPRED 0x00000020 ///< H.264 weighted biprediction for B-frames
590#define CODEC_FLAG2_MIXED_REFS 0x00000040 ///< H.264 one reference per partition, as opposed to one reference per macroblock
591#define CODEC_FLAG2_8X8DCT 0x00000080 ///< H.264 high profile 8x8 transform
592#define CODEC_FLAG2_FASTPSKIP 0x00000100 ///< H.264 fast pskip
593#define CODEC_FLAG2_AUD 0x00000200 ///< H.264 access unit delimiters
594#define CODEC_FLAG2_BRDO 0x00000400 ///< B-frame rate-distortion optimization
595#define CODEC_FLAG2_INTRA_VLC 0x00000800 ///< Use MPEG-2 intra VLC table.
596#define CODEC_FLAG2_MEMC_ONLY 0x00001000 ///< Only do ME/MC (I frames -> ref, P frame -> ME+MC).
597#define CODEC_FLAG2_DROP_FRAME_TIMECODE 0x00002000 ///< timecode is in drop frame format.
598#define CODEC_FLAG2_SKIP_RD 0x00004000 ///< RD optimal MB level residual skipping
599#define CODEC_FLAG2_CHUNKS 0x00008000 ///< Input bitstream might be truncated at a packet boundaries instead of only at frame boundaries.
600#define CODEC_FLAG2_NON_LINEAR_QUANT 0x00010000 ///< Use MPEG-2 nonlinear quantizer.
601#define CODEC_FLAG2_BIT_RESERVOIR 0x00020000 ///< Use a bit reservoir when encoding if possible
602#define CODEC_FLAG2_MBTREE 0x00040000 ///< Use macroblock tree ratecontrol (x264 only)
603#define CODEC_FLAG2_PSY 0x00080000 ///< Use psycho visual optimizations.
604#define CODEC_FLAG2_SSIM 0x00100000 ///< Compute SSIM during encoding, error[] values are undefined.
605
606/* Unsupported options :
607 * Syntax Arithmetic coding (SAC)
608 * Reference Picture Selection
609 * Independent Segment Decoding */
610/* /Fx */
611/* codec capabilities */
612
613#define CODEC_CAP_DRAW_HORIZ_BAND 0x0001 ///< Decoder can use draw_horiz_band callback.
614/**
615 * Codec uses get_buffer() for allocating buffers and supports custom allocators.
616 * If not set, it might not use get_buffer() at all or use operations that
617 * assume the buffer was allocated by avcodec_default_get_buffer.
618 */
619#define CODEC_CAP_DR1 0x0002
620/* If 'parse_only' field is true, then avcodec_parse_frame() can be used. */
621#define CODEC_CAP_PARSE_ONLY 0x0004
622#define CODEC_CAP_TRUNCATED 0x0008
623/* Codec can export data for HW decoding (XvMC). */
624#define CODEC_CAP_HWACCEL 0x0010
625/**
626 * Codec has a nonzero delay and needs to be fed with NULL at the end to get the delayed data.
627 * If this is not set, the codec is guaranteed to never be fed with NULL data.
628 */
629#define CODEC_CAP_DELAY 0x0020
630/**
631 * Codec can be fed a final frame with a smaller size.
632 * This can be used to prevent truncation of the last audio samples.
633 */
634#define CODEC_CAP_SMALL_LAST_FRAME 0x0040
635/**
636 * Codec can export data for HW decoding (VDPAU).
637 */
638#define CODEC_CAP_HWACCEL_VDPAU 0x0080
639/**
640 * Codec can output multiple frames per AVPacket
641 * Normally demuxers return one frame at a time, demuxers which do not do
642 * are connected to a parser to split what they return into proper frames.
643 * This flag is reserved to the very rare category of codecs which have a
644 * bitstream that cannot be split into frames without timeconsuming
645 * operations like full decoding. Demuxers carring such bitstreams thus
646 * may return multiple frames in a packet. This has many disadvantages like
647 * prohibiting stream copy in many cases thus it should only be considered
648 * as a last resort.
649 */
650#define CODEC_CAP_SUBFRAMES 0x0100
651
652//The following defines may change, don't expect compatibility if you use them.
653#define MB_TYPE_INTRA4x4 0x0001
654#define MB_TYPE_INTRA16x16 0x0002 //FIXME H.264-specific
655#define MB_TYPE_INTRA_PCM 0x0004 //FIXME H.264-specific
656#define MB_TYPE_16x16 0x0008
657#define MB_TYPE_16x8 0x0010
658#define MB_TYPE_8x16 0x0020
659#define MB_TYPE_8x8 0x0040
660#define MB_TYPE_INTERLACED 0x0080
661#define MB_TYPE_DIRECT2 0x0100 //FIXME
662#define MB_TYPE_ACPRED 0x0200
663#define MB_TYPE_GMC 0x0400
664#define MB_TYPE_SKIP 0x0800
665#define MB_TYPE_P0L0 0x1000
666#define MB_TYPE_P1L0 0x2000
667#define MB_TYPE_P0L1 0x4000
668#define MB_TYPE_P1L1 0x8000
669#define MB_TYPE_L0 (MB_TYPE_P0L0 | MB_TYPE_P1L0)
670#define MB_TYPE_L1 (MB_TYPE_P0L1 | MB_TYPE_P1L1)
671#define MB_TYPE_L0L1 (MB_TYPE_L0 | MB_TYPE_L1)
672#define MB_TYPE_QUANT 0x00010000
673#define MB_TYPE_CBP 0x00020000
674//Note bits 24-31 are reserved for codec specific use (h264 ref0, mpeg1 0mv, ...)
675
676/**
677 * Pan Scan area.
678 * This specifies the area which should be displayed.
679 * Note there may be multiple such areas for one frame.
680 */
681typedef struct AVPanScan{
682 /**
683 * id
684 * - encoding: Set by user.
685 * - decoding: Set by libavcodec.
686 */
687 int id;
688
689 /**
690 * width and height in 1/16 pel
691 * - encoding: Set by user.
692 * - decoding: Set by libavcodec.
693 */
694 int width;
695 int height;
696
697 /**
698 * position of the top left corner in 1/16 pel for up to 3 fields/frames
699 * - encoding: Set by user.
700 * - decoding: Set by libavcodec.
701 */
702 int16_t position[3][2];
703}AVPanScan;
704
705#define FF_COMMON_FRAME \
706 /**\
707 * pointer to the picture planes.\
708 * This might be different from the first allocated byte\
709 * - encoding: \
710 * - decoding: \
711 */\
712 uint8_t *data[4];\
713 int linesize[4];\
714 /**\
715 * pointer to the first allocated byte of the picture. Can be used in get_buffer/release_buffer.\
716 * This isn't used by libavcodec unless the default get/release_buffer() is used.\
717 * - encoding: \
718 * - decoding: \
719 */\
720 uint8_t *base[4];\
721 /**\
722 * 1 -> keyframe, 0-> not\
723 * - encoding: Set by libavcodec.\
724 * - decoding: Set by libavcodec.\
725 */\
726 int key_frame;\
727\
728 /**\
729 * Picture type of the frame, see ?_TYPE below.\
730 * - encoding: Set by libavcodec. for coded_picture (and set by user for input).\
731 * - decoding: Set by libavcodec.\
732 */\
733 int pict_type;\
734\
735 /**\
736 * presentation timestamp in time_base units (time when frame should be shown to user)\
737 * If AV_NOPTS_VALUE then frame_rate = 1/time_base will be assumed.\
738 * - encoding: MUST be set by user.\
739 * - decoding: Set by libavcodec.\
740 */\
741 int64_t pts;\
742\
743 /**\
744 * picture number in bitstream order\
745 * - encoding: set by\
746 * - decoding: Set by libavcodec.\
747 */\
748 int coded_picture_number;\
749 /**\
750 * picture number in display order\
751 * - encoding: set by\
752 * - decoding: Set by libavcodec.\
753 */\
754 int display_picture_number;\
755\
756 /**\
757 * quality (between 1 (good) and FF_LAMBDA_MAX (bad)) \
758 * - encoding: Set by libavcodec. for coded_picture (and set by user for input).\
759 * - decoding: Set by libavcodec.\
760 */\
761 int quality; \
762\
763 /**\
764 * buffer age (1->was last buffer and dint change, 2->..., ...).\
765 * Set to INT_MAX if the buffer has not been used yet.\
766 * - encoding: unused\
767 * - decoding: MUST be set by get_buffer().\
768 */\
769 int age;\
770\
771 /**\
772 * is this picture used as reference\
773 * The values for this are the same as the MpegEncContext.picture_structure\
774 * variable, that is 1->top field, 2->bottom field, 3->frame/both fields.\
775 * Set to 4 for delayed, non-reference frames.\
776 * - encoding: unused\
777 * - decoding: Set by libavcodec. (before get_buffer() call)).\
778 */\
779 int reference;\
780\
781 /**\
782 * QP table\
783 * - encoding: unused\
784 * - decoding: Set by libavcodec.\
785 */\
786 int8_t *qscale_table;\
787 /**\
788 * QP store stride\
789 * - encoding: unused\
790 * - decoding: Set by libavcodec.\
791 */\
792 int qstride;\
793\
794 /**\
795 * mbskip_table[mb]>=1 if MB didn't change\
796 * stride= mb_width = (width+15)>>4\
797 * - encoding: unused\
798 * - decoding: Set by libavcodec.\
799 */\
800 uint8_t *mbskip_table;\
801\
802 /**\
803 * motion vector table\
804 * @code\
805 * example:\
806 * int mv_sample_log2= 4 - motion_subsample_log2;\
807 * int mb_width= (width+15)>>4;\
808 * int mv_stride= (mb_width << mv_sample_log2) + 1;\
809 * motion_val[direction][x + y*mv_stride][0->mv_x, 1->mv_y];\
810 * @endcode\
811 * - encoding: Set by user.\
812 * - decoding: Set by libavcodec.\
813 */\
814 int16_t (*motion_val[2])[2];\
815\
816 /**\
817 * macroblock type table\
818 * mb_type_base + mb_width + 2\
819 * - encoding: Set by user.\
820 * - decoding: Set by libavcodec.\
821 */\
822 uint32_t *mb_type;\
823\
824 /**\
825 * log2 of the size of the block which a single vector in motion_val represents: \
826 * (4->16x16, 3->8x8, 2-> 4x4, 1-> 2x2)\
827 * - encoding: unused\
828 * - decoding: Set by libavcodec.\
829 */\
830 uint8_t motion_subsample_log2;\
831\
832 /**\
833 * for some private data of the user\
834 * - encoding: unused\
835 * - decoding: Set by user.\
836 */\
837 void *opaque;\
838\
839 /**\
840 * error\
841 * - encoding: Set by libavcodec. if flags&CODEC_FLAG_PSNR.\
842 * - decoding: unused\
843 */\
844 uint64_t error[4];\
845\
846 /**\
847 * type of the buffer (to keep track of who has to deallocate data[*])\
848 * - encoding: Set by the one who allocates it.\
849 * - decoding: Set by the one who allocates it.\
850 * Note: User allocated (direct rendering) & internal buffers cannot coexist currently.\
851 */\
852 int type;\
853 \
854 /**\
855 * When decoding, this signals how much the picture must be delayed.\
856 * extra_delay = repeat_pict / (2*fps)\
857 * - encoding: unused\
858 * - decoding: Set by libavcodec.\
859 */\
860 int repeat_pict;\
861 \
862 /**\
863 * \
864 */\
865 int qscale_type;\
866 \
867 /**\
868 * The content of the picture is interlaced.\
869 * - encoding: Set by user.\
870 * - decoding: Set by libavcodec. (default 0)\
871 */\
872 int interlaced_frame;\
873 \
874 /**\
875 * If the content is interlaced, is top field displayed first.\
876 * - encoding: Set by user.\
877 * - decoding: Set by libavcodec.\
878 */\
879 int top_field_first;\
880 \
881 /**\
882 * Pan scan.\
883 * - encoding: Set by user.\
884 * - decoding: Set by libavcodec.\
885 */\
886 AVPanScan *pan_scan;\
887 \
888 /**\
889 * Tell user application that palette has changed from previous frame.\
890 * - encoding: ??? (no palette-enabled encoder yet)\
891 * - decoding: Set by libavcodec. (default 0).\
892 */\
893 int palette_has_changed;\
894 \
895 /**\
896 * codec suggestion on buffer type if != 0\
897 * - encoding: unused\
898 * - decoding: Set by libavcodec. (before get_buffer() call)).\
899 */\
900 int buffer_hints;\
901\
902 /**\
903 * DCT coefficients\
904 * - encoding: unused\
905 * - decoding: Set by libavcodec.\
906 */\
907 short *dct_coeff;\
908\
909 /**\
910 * motion reference frame index\
911 * the order in which these are stored can depend on the codec.\
912 * - encoding: Set by user.\
913 * - decoding: Set by libavcodec.\
914 */\
915 int8_t *ref_index[2];\
916\
917 /**\
918 * reordered opaque 64bit number (generally a PTS) from AVCodecContext.reordered_opaque\
919 * output in AVFrame.reordered_opaque\
920 * - encoding: unused\
921 * - decoding: Read by user.\
922 */\
923 int64_t reordered_opaque;\
924\
925 /**\
926 * hardware accelerator private data (FFmpeg allocated)\
927 * - encoding: unused\
928 * - decoding: Set by libavcodec\
929 */\
930 void *hwaccel_picture_private;\
931
932
933#define FF_QSCALE_TYPE_MPEG1 0
934#define FF_QSCALE_TYPE_MPEG2 1
935#define FF_QSCALE_TYPE_H264 2
936#define FF_QSCALE_TYPE_VP56 3
937
938#define FF_BUFFER_TYPE_INTERNAL 1
939#define FF_BUFFER_TYPE_USER 2 ///< direct rendering buffers (image is (de)allocated by user)
940#define FF_BUFFER_TYPE_SHARED 4 ///< Buffer from somewhere else; don't deallocate image (data/base), all other tables are not shared.
941#define FF_BUFFER_TYPE_COPY 8 ///< Just a (modified) copy of some other buffer, don't deallocate anything.
942
943
944#define FF_I_TYPE 1 ///< Intra
945#define FF_P_TYPE 2 ///< Predicted
946#define FF_B_TYPE 3 ///< Bi-dir predicted
947#define FF_S_TYPE 4 ///< S(GMC)-VOP MPEG4
948#define FF_SI_TYPE 5 ///< Switching Intra
949#define FF_SP_TYPE 6 ///< Switching Predicted
950#define FF_BI_TYPE 7
951
952#define FF_BUFFER_HINTS_VALID 0x01 // Buffer hints value is meaningful (if 0 ignore).
953#define FF_BUFFER_HINTS_READABLE 0x02 // Codec will read from buffer.
954#define FF_BUFFER_HINTS_PRESERVE 0x04 // User must not alter buffer content.
955#define FF_BUFFER_HINTS_REUSABLE 0x08 // Codec will reuse the buffer (update).
956
957typedef struct AVPacket {
958 /**
959 * Presentation timestamp in AVStream->time_base units; the time at which
960 * the decompressed packet will be presented to the user.
961 * Can be AV_NOPTS_VALUE if it is not stored in the file.
962 * pts MUST be larger or equal to dts as presentation cannot happen before
963 * decompression, unless one wants to view hex dumps. Some formats misuse
964 * the terms dts and pts/cts to mean something different. Such timestamps
965 * must be converted to true pts/dts before they are stored in AVPacket.
966 */
967 int64_t pts;
968 /**
969 * Decompression timestamp in AVStream->time_base units; the time at which
970 * the packet is decompressed.
971 * Can be AV_NOPTS_VALUE if it is not stored in the file.
972 */
973 int64_t dts;
974 uint8_t *data;
975 int size;
976 int stream_index;
977 int flags;
978 /**
979 * Duration of this packet in AVStream->time_base units, 0 if unknown.
980 * Equals next_pts - this_pts in presentation order.
981 */
982 int duration;
983 void (*destruct)(struct AVPacket *);
984 void *priv;
985 int64_t pos; ///< byte position in stream, -1 if unknown
986
987 /**
988 * Time difference in AVStream->time_base units from the pts of this
989 * packet to the point at which the output from the decoder has converged
990 * independent from the availability of previous frames. That is, the
991 * frames are virtually identical no matter if decoding started from
992 * the very first frame or from this keyframe.
993 * Is AV_NOPTS_VALUE if unknown.
994 * This field is not the display duration of the current packet.
995 *
996 * The purpose of this field is to allow seeking in streams that have no
997 * keyframes in the conventional sense. It corresponds to the
998 * recovery point SEI in H.264 and match_time_delta in NUT. It is also
999 * essential for some types of subtitle streams to ensure that all
1000 * subtitles are correctly displayed after seeking.
1001 */
1002 int64_t convergence_duration;
1003} AVPacket;
1004#define AV_PKT_FLAG_KEY 0x0001
1005#if LIBAVCODEC_VERSION_MAJOR < 53
1006#define PKT_FLAG_KEY AV_PKT_FLAG_KEY
1007#endif
1008
1009/**
1010 * Audio Video Frame.
1011 * New fields can be added to the end of FF_COMMON_FRAME with minor version
1012 * bumps.
1013 * Removal, reordering and changes to existing fields require a major
1014 * version bump. No fields should be added into AVFrame before or after
1015 * FF_COMMON_FRAME!
1016 * sizeof(AVFrame) must not be used outside libav*.
1017 */
1018typedef struct AVFrame {
1019 FF_COMMON_FRAME
1020} AVFrame;
1021
1022/**
1023 * main external API structure.
1024 * New fields can be added to the end with minor version bumps.
1025 * Removal, reordering and changes to existing fields require a major
1026 * version bump.
1027 * sizeof(AVCodecContext) must not be used outside libav*.
1028 */
1029typedef struct AVCodecContext {
1030 /**
1031 * information on struct for av_log
1032 * - set by avcodec_alloc_context
1033 */
1034 const AVClass *av_class;
1035 /**
1036 * the average bitrate
1037 * - encoding: Set by user; unused for constant quantizer encoding.
1038 * - decoding: Set by libavcodec. 0 or some bitrate if this info is available in the stream.
1039 */
1040 int bit_rate;
1041
1042 /**
1043 * number of bits the bitstream is allowed to diverge from the reference.
1044 * the reference can be CBR (for CBR pass1) or VBR (for pass2)
1045 * - encoding: Set by user; unused for constant quantizer encoding.
1046 * - decoding: unused
1047 */
1048 int bit_rate_tolerance;
1049
1050 /**
1051 * CODEC_FLAG_*.
1052 * - encoding: Set by user.
1053 * - decoding: Set by user.
1054 */
1055 int flags;
1056
1057 /**
1058 * Some codecs need additional format info. It is stored here.
1059 * If any muxer uses this then ALL demuxers/parsers AND encoders for the
1060 * specific codec MUST set it correctly otherwise stream copy breaks.
1061 * In general use of this field by muxers is not recommanded.
1062 * - encoding: Set by libavcodec.
1063 * - decoding: Set by libavcodec. (FIXME: Is this OK?)
1064 */
1065 int sub_id;
1066
1067 /**
1068 * Motion estimation algorithm used for video coding.
1069 * 1 (zero), 2 (full), 3 (log), 4 (phods), 5 (epzs), 6 (x1), 7 (hex),
1070 * 8 (umh), 9 (iter), 10 (tesa) [7, 8, 10 are x264 specific, 9 is snow specific]
1071 * - encoding: MUST be set by user.
1072 * - decoding: unused
1073 */
1074 int me_method;
1075
1076 /**
1077 * some codecs need / can use extradata like Huffman tables.
1078 * mjpeg: Huffman tables
1079 * rv10: additional flags
1080 * mpeg4: global headers (they can be in the bitstream or here)
1081 * The allocated memory should be FF_INPUT_BUFFER_PADDING_SIZE bytes larger
1082 * than extradata_size to avoid prolems if it is read with the bitstream reader.
1083 * The bytewise contents of extradata must not depend on the architecture or CPU endianness.
1084 * - encoding: Set/allocated/freed by libavcodec.
1085 * - decoding: Set/allocated/freed by user.
1086 */
1087 uint8_t *extradata;
1088 int extradata_size;
1089
1090 /**
1091 * This is the fundamental unit of time (in seconds) in terms
1092 * of which frame timestamps are represented. For fixed-fps content,
1093 * timebase should be 1/framerate and timestamp increments should be
1094 * identically 1.
1095 * - encoding: MUST be set by user.
1096 * - decoding: Set by libavcodec.
1097 */
1098 //AVRational time_base;
1099
1100 /* video only */
1101 /**
1102 * picture width / height.
1103 * - encoding: MUST be set by user.
1104 * - decoding: Set by libavcodec.
1105 * Note: For compatibility it is possible to set this instead of
1106 * coded_width/height before decoding.
1107 */
1108 int width, height;
1109
1110#define FF_ASPECT_EXTENDED 15
1111
1112 /**
1113 * the number of pictures in a group of pictures, or 0 for intra_only
1114 * - encoding: Set by user.
1115 * - decoding: unused
1116 */
1117 int gop_size;
1118
1119 /**
1120 * Pixel format, see PIX_FMT_xxx.
1121 * - encoding: Set by user.
1122 * - decoding: Set by libavcodec.
1123 */
1124 //enum PixelFormat pix_fmt;
1125
1126 /**
1127 * Frame rate emulation. If not zero, the lower layer (i.e. format handler)
1128 * has to read frames at native frame rate.
1129 * - encoding: Set by user.
1130 * - decoding: unused
1131 */
1132 int rate_emu;
1133
1134 /**
1135 * If non NULL, 'draw_horiz_band' is called by the libavcodec
1136 * decoder to draw a horizontal band. It improves cache usage. Not
1137 * all codecs can do that. You must check the codec capabilities
1138 * beforehand.
1139 * The function is also used by hardware acceleration APIs.
1140 * It is called at least once during frame decoding to pass
1141 * the data needed for hardware render.
1142 * In that mode instead of pixel data, AVFrame points to
1143 * a structure specific to the acceleration API. The application
1144 * reads the structure and can change some fields to indicate progress
1145 * or mark state.
1146 * - encoding: unused
1147 * - decoding: Set by user.
1148 * @param height the height of the slice
1149 * @param y the y position of the slice
1150 * @param type 1->top field, 2->bottom field, 3->frame
1151 * @param offset offset into the AVFrame.data from which the slice should be read
1152 */
1153 void (*draw_horiz_band)(struct AVCodecContext *s,
1154 const AVFrame *src, int offset[4],
1155 int y, int type, int height);
1156
1157 /* audio only */
1158 int sample_rate; ///< samples per second
1159 int channels; ///< number of audio channels
1160
1161 /**
1162 * audio sample format
1163 * - encoding: Set by user.
1164 * - decoding: Set by libavcodec.
1165 */
1166 enum SampleFormat sample_fmt; ///< sample format
1167
1168 /* The following data should not be initialized. */
1169 /**
1170 * Samples per packet, initialized when calling 'init'.
1171 */
1172 int frame_size;
1173 int frame_number; ///< audio or video frame number
1174#if LIBAVCODEC_VERSION_MAJOR < 53
1175 int real_pict_num; ///< Returns the real picture number of previous encoded frame.
1176#endif
1177
1178 /**
1179 * Number of frames the decoded output will be delayed relative to
1180 * the encoded input.
1181 * - encoding: Set by libavcodec.
1182 * - decoding: unused
1183 */
1184 int delay;
1185
1186 /* - encoding parameters */
1187 float qcompress; ///< amount of qscale change between easy & hard scenes (0.0-1.0)
1188 float qblur; ///< amount of qscale smoothing over time (0.0-1.0)
1189
1190 /**
1191 * minimum quantizer
1192 * - encoding: Set by user.
1193 * - decoding: unused
1194 */
1195 int qmin;
1196
1197 /**
1198 * maximum quantizer
1199 * - encoding: Set by user.
1200 * - decoding: unused
1201 */
1202 int qmax;
1203
1204 /**
1205 * maximum quantizer difference between frames
1206 * - encoding: Set by user.
1207 * - decoding: unused
1208 */
1209 int max_qdiff;
1210
1211 /**
1212 * maximum number of B-frames between non-B-frames
1213 * Note: The output will be delayed by max_b_frames+1 relative to the input.
1214 * - encoding: Set by user.
1215 * - decoding: unused
1216 */
1217 int max_b_frames;
1218
1219 /**
1220 * qscale factor between IP and B-frames
1221 * If > 0 then the last P-frame quantizer will be used (q= lastp_q*factor+offset).
1222 * If < 0 then normal ratecontrol will be done (q= -normal_q*factor+offset).
1223 * - encoding: Set by user.
1224 * - decoding: unused
1225 */
1226 float b_quant_factor;
1227
1228 /** obsolete FIXME remove */
1229 int rc_strategy;
1230#define FF_RC_STRATEGY_XVID 1
1231
1232 int b_frame_strategy;
1233
1234 /**
1235 * hurry up amount
1236 * - encoding: unused
1237 * - decoding: Set by user. 1-> Skip B-frames, 2-> Skip IDCT/dequant too, 5-> Skip everything except header
1238 * @deprecated Deprecated in favor of skip_idct and skip_frame.
1239 */
1240 int hurry_up;
1241
1242 struct AVCodec *codec;
1243
1244 void *priv_data;
1245
1246 int rtp_payload_size; /* The size of the RTP payload: the coder will */
1247 /* do its best to deliver a chunk with size */
1248 /* below rtp_payload_size, the chunk will start */
1249 /* with a start code on some codecs like H.263. */
1250 /* This doesn't take account of any particular */
1251 /* headers inside the transmitted RTP payload. */
1252
1253
1254 /* The RTP callback: This function is called */
1255 /* every time the encoder has a packet to send. */
1256 /* It depends on the encoder if the data starts */
1257 /* with a Start Code (it should). H.263 does. */
1258 /* mb_nb contains the number of macroblocks */
1259 /* encoded in the RTP payload. */
1260 void (*rtp_callback)(struct AVCodecContext *avctx, void *data, int size, int mb_nb);
1261
1262 /* statistics, used for 2-pass encoding */
1263 int mv_bits;
1264 int header_bits;
1265 int i_tex_bits;
1266 int p_tex_bits;
1267 int i_count;
1268 int p_count;
1269 int skip_count;
1270 int misc_bits;
1271
1272 /**
1273 * number of bits used for the previously encoded frame
1274 * - encoding: Set by libavcodec.
1275 * - decoding: unused
1276 */
1277 int frame_bits;
1278
1279 /**
1280 * Private data of the user, can be used to carry app specific stuff.
1281 * - encoding: Set by user.
1282 * - decoding: Set by user.
1283 */
1284 void *opaque;
1285
1286 char codec_name[32];
1287 enum AVMediaType codec_type; /* see AVMEDIA_TYPE_xxx */
1288 enum CodecID codec_id; /* see CODEC_ID_xxx */
1289
1290 /**
1291 * fourcc (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A').
1292 * This is used to work around some encoder bugs.
1293 * A demuxer should set this to what is stored in the field used to identify the codec.
1294 * If there are multiple such fields in a container then the demuxer should choose the one
1295 * which maximizes the information about the used codec.
1296 * If the codec tag field in a container is larger then 32 bits then the demuxer should
1297 * remap the longer ID to 32 bits with a table or other structure. Alternatively a new
1298 * extra_codec_tag + size could be added but for this a clear advantage must be demonstrated
1299 * first.
1300 * - encoding: Set by user, if not then the default based on codec_id will be used.
1301 * - decoding: Set by user, will be converted to uppercase by libavcodec during init.
1302 */
1303 unsigned int codec_tag;
1304
1305 /**
1306 * Work around bugs in encoders which sometimes cannot be detected automatically.
1307 * - encoding: Set by user
1308 * - decoding: Set by user
1309 */
1310 int workaround_bugs;
1311#define FF_BUG_AUTODETECT 1 ///< autodetection
1312#define FF_BUG_OLD_MSMPEG4 2
1313#define FF_BUG_XVID_ILACE 4
1314#define FF_BUG_UMP4 8
1315#define FF_BUG_NO_PADDING 16
1316#define FF_BUG_AMV 32
1317#define FF_BUG_AC_VLC 0 ///< Will be removed, libavcodec can now handle these non-compliant files by default.
1318#define FF_BUG_QPEL_CHROMA 64
1319#define FF_BUG_STD_QPEL 128
1320#define FF_BUG_QPEL_CHROMA2 256
1321#define FF_BUG_DIRECT_BLOCKSIZE 512
1322#define FF_BUG_EDGE 1024
1323#define FF_BUG_HPEL_CHROMA 2048
1324#define FF_BUG_DC_CLIP 4096
1325#define FF_BUG_MS 8192 ///< Work around various bugs in Microsoft's broken decoders.
1326#define FF_BUG_TRUNCATED 16384
1327//#define FF_BUG_FAKE_SCALABILITY 16 //Autodetection should work 100%.
1328
1329 /**
1330 * luma single coefficient elimination threshold
1331 * - encoding: Set by user.
1332 * - decoding: unused
1333 */
1334 int luma_elim_threshold;
1335
1336 /**
1337 * chroma single coeff elimination threshold
1338 * - encoding: Set by user.
1339 * - decoding: unused
1340 */
1341 int chroma_elim_threshold;
1342
1343 /**
1344 * strictly follow the standard (MPEG4, ...).
1345 * - encoding: Set by user.
1346 * - decoding: Set by user.
1347 * Setting this to STRICT or higher means the encoder and decoder will
1348 * generally do stupid things. While setting it to inofficial or lower
1349 * will mean the encoder might use things that are not supported by all
1350 * spec compliant decoders. Decoders make no difference between normal,
1351 * inofficial and experimental, that is they always try to decode things
1352 * when they can unless they are explicitly asked to behave stupid
1353 * (=strictly conform to the specs)
1354 */
1355 int strict_std_compliance;
1356#define FF_COMPLIANCE_VERY_STRICT 2 ///< Strictly conform to a older more strict version of the spec or reference software.
1357#define FF_COMPLIANCE_STRICT 1 ///< Strictly conform to all the things in the spec no matter what consequences.
1358#define FF_COMPLIANCE_NORMAL 0
1359#define FF_COMPLIANCE_INOFFICIAL -1 ///< Allow inofficial extensions.
1360#define FF_COMPLIANCE_EXPERIMENTAL -2 ///< Allow nonstandardized experimental things.
1361
1362 /**
1363 * qscale offset between IP and B-frames
1364 * - encoding: Set by user.
1365 * - decoding: unused
1366 */
1367 float b_quant_offset;
1368
1369 /**
1370 * Error recognization; higher values will detect more errors but may
1371 * misdetect some more or less valid parts as errors.
1372 * - encoding: unused
1373 * - decoding: Set by user.
1374 */
1375 int error_recognition;
1376#define FF_ER_CAREFUL 1
1377#define FF_ER_COMPLIANT 2
1378#define FF_ER_AGGRESSIVE 3
1379#define FF_ER_VERY_AGGRESSIVE 4
1380
1381 /**
1382 * Called at the beginning of each frame to get a buffer for it.
1383 * If pic.reference is set then the frame will be read later by libavcodec.
1384 * avcodec_align_dimensions2() should be used to find the required width and
1385 * height, as they normally need to be rounded up to the next multiple of 16.
1386 * if CODEC_CAP_DR1 is not set then get_buffer() must call
1387 * avcodec_default_get_buffer() instead of providing buffers allocated by
1388 * some other means.
1389 * - encoding: unused
1390 * - decoding: Set by libavcodec., user can override.
1391 */
1392 int (*get_buffer)(struct AVCodecContext *c, AVFrame *pic);
1393
1394 /**
1395 * Called to release buffers which were allocated with get_buffer.
1396 * A released buffer can be reused in get_buffer().
1397 * pic.data[*] must be set to NULL.
1398 * - encoding: unused
1399 * - decoding: Set by libavcodec., user can override.
1400 */
1401 void (*release_buffer)(struct AVCodecContext *c, AVFrame *pic);
1402
1403 /**
1404 * Size of the frame reordering buffer in the decoder.
1405 * For MPEG-2 it is 1 IPB or 0 low delay IP.
1406 * - encoding: Set by libavcodec.
1407 * - decoding: Set by libavcodec.
1408 */
1409 int has_b_frames;
1410
1411 /**
1412 * number of bytes per packet if constant and known or 0
1413 * Used by some WAV based audio codecs.
1414 */
1415 int block_align;
1416
1417 int parse_only; /* - decoding only: If true, only parsing is done
1418 (function avcodec_parse_frame()). The frame
1419 data is returned. Only MPEG codecs support this now. */
1420
1421 /**
1422 * 0-> h263 quant 1-> mpeg quant
1423 * - encoding: Set by user.
1424 * - decoding: unused
1425 */
1426 int mpeg_quant;
1427
1428 /**
1429 * pass1 encoding statistics output buffer
1430 * - encoding: Set by libavcodec.
1431 * - decoding: unused
1432 */
1433 char *stats_out;
1434
1435 /**
1436 * pass2 encoding statistics input buffer
1437 * Concatenated stuff from stats_out of pass1 should be placed here.
1438 * - encoding: Allocated/set/freed by user.
1439 * - decoding: unused
1440 */
1441 char *stats_in;
1442
1443 /**
1444 * ratecontrol qmin qmax limiting method
1445 * 0-> clipping, 1-> use a nice continous function to limit qscale wthin qmin/qmax.
1446 * - encoding: Set by user.
1447 * - decoding: unused
1448 */
1449 float rc_qsquish;
1450
1451 float rc_qmod_amp;
1452 int rc_qmod_freq;
1453
1454 /**
1455 * ratecontrol override, see RcOverride
1456 * - encoding: Allocated/set/freed by user.
1457 * - decoding: unused
1458 */
1459 RcOverride *rc_override;
1460 int rc_override_count;
1461
1462 /**
1463 * rate control equation
1464 * - encoding: Set by user
1465 * - decoding: unused
1466 */
1467 const char *rc_eq;
1468
1469 /**
1470 * maximum bitrate
1471 * - encoding: Set by user.
1472 * - decoding: unused
1473 */
1474 int rc_max_rate;
1475
1476 /**
1477 * minimum bitrate
1478 * - encoding: Set by user.
1479 * - decoding: unused
1480 */
1481 int rc_min_rate;
1482
1483 /**
1484 * decoder bitstream buffer size
1485 * - encoding: Set by user.
1486 * - decoding: unused
1487 */
1488 int rc_buffer_size;
1489 float rc_buffer_aggressivity;
1490
1491 /**
1492 * qscale factor between P and I-frames
1493 * If > 0 then the last p frame quantizer will be used (q= lastp_q*factor+offset).
1494 * If < 0 then normal ratecontrol will be done (q= -normal_q*factor+offset).
1495 * - encoding: Set by user.
1496 * - decoding: unused
1497 */
1498 float i_quant_factor;
1499
1500 /**
1501 * qscale offset between P and I-frames
1502 * - encoding: Set by user.
1503 * - decoding: unused
1504 */
1505 float i_quant_offset;
1506
1507 /**
1508 * initial complexity for pass1 ratecontrol
1509 * - encoding: Set by user.
1510 * - decoding: unused
1511 */
1512 float rc_initial_cplx;
1513
1514 /**
1515 * DCT algorithm, see FF_DCT_* below
1516 * - encoding: Set by user.
1517 * - decoding: unused
1518 */
1519 int dct_algo;
1520#define FF_DCT_AUTO 0
1521#define FF_DCT_FASTINT 1
1522#define FF_DCT_INT 2
1523#define FF_DCT_MMX 3
1524#define FF_DCT_MLIB 4
1525#define FF_DCT_ALTIVEC 5
1526#define FF_DCT_FAAN 6
1527
1528 /**
1529 * luminance masking (0-> disabled)
1530 * - encoding: Set by user.
1531 * - decoding: unused
1532 */
1533 float lumi_masking;
1534
1535 /**
1536 * temporary complexity masking (0-> disabled)
1537 * - encoding: Set by user.
1538 * - decoding: unused
1539 */
1540 float temporal_cplx_masking;
1541
1542 /**
1543 * spatial complexity masking (0-> disabled)
1544 * - encoding: Set by user.
1545 * - decoding: unused
1546 */
1547 float spatial_cplx_masking;
1548
1549 /**
1550 * p block masking (0-> disabled)
1551 * - encoding: Set by user.
1552 * - decoding: unused
1553 */
1554 float p_masking;
1555
1556 /**
1557 * darkness masking (0-> disabled)
1558 * - encoding: Set by user.
1559 * - decoding: unused
1560 */
1561 float dark_masking;
1562
1563 /**
1564 * IDCT algorithm, see FF_IDCT_* below.
1565 * - encoding: Set by user.
1566 * - decoding: Set by user.
1567 */
1568 int idct_algo;
1569#define FF_IDCT_AUTO 0
1570#define FF_IDCT_INT 1
1571#define FF_IDCT_SIMPLE 2
1572#define FF_IDCT_SIMPLEMMX 3
1573#define FF_IDCT_LIBMPEG2MMX 4
1574#define FF_IDCT_PS2 5
1575#define FF_IDCT_MLIB 6
1576#define FF_IDCT_ARM 7
1577#define FF_IDCT_ALTIVEC 8
1578#define FF_IDCT_SH4 9
1579#define FF_IDCT_SIMPLEARM 10
1580#define FF_IDCT_H264 11
1581#define FF_IDCT_VP3 12
1582#define FF_IDCT_IPP 13
1583#define FF_IDCT_XVIDMMX 14
1584#define FF_IDCT_CAVS 15
1585#define FF_IDCT_SIMPLEARMV5TE 16
1586#define FF_IDCT_SIMPLEARMV6 17
1587#define FF_IDCT_SIMPLEVIS 18
1588#define FF_IDCT_WMV2 19
1589#define FF_IDCT_FAAN 20
1590#define FF_IDCT_EA 21
1591#define FF_IDCT_SIMPLENEON 22
1592#define FF_IDCT_SIMPLEALPHA 23
1593#define FF_IDCT_BINK 24
1594
1595 /**
1596 * slice count
1597 * - encoding: Set by libavcodec.
1598 * - decoding: Set by user (or 0).
1599 */
1600 int slice_count;
1601 /**
1602 * slice offsets in the frame in bytes
1603 * - encoding: Set/allocated by libavcodec.
1604 * - decoding: Set/allocated by user (or NULL).
1605 */
1606 int *slice_offset;
1607
1608 /**
1609 * error concealment flags
1610 * - encoding: unused
1611 * - decoding: Set by user.
1612 */
1613 int error_concealment;
1614#define FF_EC_GUESS_MVS 1
1615#define FF_EC_DEBLOCK 2
1616
1617 /**
1618 * dsp_mask could be add used to disable unwanted CPU features
1619 * CPU features (i.e. MMX, SSE. ...)
1620 *
1621 * With the FORCE flag you may instead enable given CPU features.
1622 * (Dangerous: Usable in case of misdetection, improper usage however will
1623 * result into program crash.)
1624 */
1625 unsigned dsp_mask;
1626#define FF_MM_FORCE 0x80000000 /* Force usage of selected flags (OR) */
1627 /* lower 16 bits - CPU features */
1628#define FF_MM_MMX 0x0001 ///< standard MMX
1629#define FF_MM_3DNOW 0x0004 ///< AMD 3DNOW
1630#if LIBAVCODEC_VERSION_MAJOR < 53
1631#define FF_MM_MMXEXT 0x0002 ///< SSE integer functions or AMD MMX ext
1632#endif
1633#define FF_MM_MMX2 0x0002 ///< SSE integer functions or AMD MMX ext
1634#define FF_MM_SSE 0x0008 ///< SSE functions
1635#define FF_MM_SSE2 0x0010 ///< PIV SSE2 functions
1636#define FF_MM_3DNOWEXT 0x0020 ///< AMD 3DNowExt
1637#define FF_MM_SSE3 0x0040 ///< Prescott SSE3 functions
1638#define FF_MM_SSSE3 0x0080 ///< Conroe SSSE3 functions
1639#define FF_MM_SSE4 0x0100 ///< Penryn SSE4.1 functions
1640#define FF_MM_SSE42 0x0200 ///< Nehalem SSE4.2 functions
1641#define FF_MM_IWMMXT 0x0100 ///< XScale IWMMXT
1642#define FF_MM_ALTIVEC 0x0001 ///< standard AltiVec
1643
1644 /**
1645 * bits per sample/pixel from the demuxer (needed for huffyuv).
1646 * - encoding: Set by libavcodec.
1647 * - decoding: Set by user.
1648 */
1649 int bits_per_coded_sample;
1650
1651 /**
1652 * prediction method (needed for huffyuv)
1653 * - encoding: Set by user.
1654 * - decoding: unused
1655 */
1656 int prediction_method;
1657#define FF_PRED_LEFT 0
1658#define FF_PRED_PLANE 1
1659#define FF_PRED_MEDIAN 2
1660
1661 /**
1662 * sample aspect ratio (0 if unknown)
1663 * That is the width of a pixel divided by the height of the pixel.
1664 * Numerator and denominator must be relatively prime and smaller than 256 for some video standards.
1665 * - encoding: Set by user.
1666 * - decoding: Set by libavcodec.
1667 */
1668 //AVRational sample_aspect_ratio;
1669
1670 /**
1671 * the picture in the bitstream
1672 * - encoding: Set by libavcodec.
1673 * - decoding: Set by libavcodec.
1674 */
1675 AVFrame *coded_frame;
1676
1677 /**
1678 * debug
1679 * - encoding: Set by user.
1680 * - decoding: Set by user.
1681 */
1682 int debug;
1683#define FF_DEBUG_PICT_INFO 1
1684#define FF_DEBUG_RC 2
1685#define FF_DEBUG_BITSTREAM 4
1686#define FF_DEBUG_MB_TYPE 8
1687#define FF_DEBUG_QP 16
1688#define FF_DEBUG_MV 32
1689#define FF_DEBUG_DCT_COEFF 0x00000040
1690#define FF_DEBUG_SKIP 0x00000080
1691#define FF_DEBUG_STARTCODE 0x00000100
1692#define FF_DEBUG_PTS 0x00000200
1693#define FF_DEBUG_ER 0x00000400
1694#define FF_DEBUG_MMCO 0x00000800
1695#define FF_DEBUG_BUGS 0x00001000
1696#define FF_DEBUG_VIS_QP 0x00002000
1697#define FF_DEBUG_VIS_MB_TYPE 0x00004000
1698#define FF_DEBUG_BUFFERS 0x00008000
1699
1700 /**
1701 * debug
1702 * - encoding: Set by user.
1703 * - decoding: Set by user.
1704 */
1705 int debug_mv;
1706#define FF_DEBUG_VIS_MV_P_FOR 0x00000001 //visualize forward predicted MVs of P frames
1707#define FF_DEBUG_VIS_MV_B_FOR 0x00000002 //visualize forward predicted MVs of B frames
1708#define FF_DEBUG_VIS_MV_B_BACK 0x00000004 //visualize backward predicted MVs of B frames
1709
1710 /**
1711 * error
1712 * - encoding: Set by libavcodec if flags&CODEC_FLAG_PSNR.
1713 * - decoding: unused
1714 */
1715 uint64_t error[4];
1716
1717 /**
1718 * minimum MB quantizer
1719 * - encoding: unused
1720 * - decoding: unused
1721 */
1722 int mb_qmin;
1723
1724 /**
1725 * maximum MB quantizer
1726 * - encoding: unused
1727 * - decoding: unused
1728 */
1729 int mb_qmax;
1730
1731 /**
1732 * motion estimation comparison function
1733 * - encoding: Set by user.
1734 * - decoding: unused
1735 */
1736 int me_cmp;
1737 /**
1738 * subpixel motion estimation comparison function
1739 * - encoding: Set by user.
1740 * - decoding: unused
1741 */
1742 int me_sub_cmp;
1743 /**
1744 * macroblock comparison function (not supported yet)
1745 * - encoding: Set by user.
1746 * - decoding: unused
1747 */
1748 int mb_cmp;
1749 /**
1750 * interlaced DCT comparison function
1751 * - encoding: Set by user.
1752 * - decoding: unused
1753 */
1754 int ildct_cmp;
1755#define FF_CMP_SAD 0
1756#define FF_CMP_SSE 1
1757#define FF_CMP_SATD 2
1758#define FF_CMP_DCT 3
1759#define FF_CMP_PSNR 4
1760#define FF_CMP_BIT 5
1761#define FF_CMP_RD 6
1762#define FF_CMP_ZERO 7
1763#define FF_CMP_VSAD 8
1764#define FF_CMP_VSSE 9
1765#define FF_CMP_NSSE 10
1766#define FF_CMP_W53 11
1767#define FF_CMP_W97 12
1768#define FF_CMP_DCTMAX 13
1769#define FF_CMP_DCT264 14
1770#define FF_CMP_CHROMA 256
1771
1772 /**
1773 * ME diamond size & shape
1774 * - encoding: Set by user.
1775 * - decoding: unused
1776 */
1777 int dia_size;
1778
1779 /**
1780 * amount of previous MV predictors (2a+1 x 2a+1 square)
1781 * - encoding: Set by user.
1782 * - decoding: unused
1783 */
1784 int last_predictor_count;
1785
1786 /**
1787 * prepass for motion estimation
1788 * - encoding: Set by user.
1789 * - decoding: unused
1790 */
1791 int pre_me;
1792
1793 /**
1794 * motion estimation prepass comparison function
1795 * - encoding: Set by user.
1796 * - decoding: unused
1797 */
1798 int me_pre_cmp;
1799
1800 /**
1801 * ME prepass diamond size & shape
1802 * - encoding: Set by user.
1803 * - decoding: unused
1804 */
1805 int pre_dia_size;
1806
1807 /**
1808 * subpel ME quality
1809 * - encoding: Set by user.
1810 * - decoding: unused
1811 */
1812 int me_subpel_quality;
1813
1814 /**
1815 * callback to negotiate the pixelFormat
1816 * @param fmt is the list of formats which are supported by the codec,
1817 * it is terminated by -1 as 0 is a valid format, the formats are ordered by quality.
1818 * The first is always the native one.
1819 * @return the chosen format
1820 * - encoding: unused
1821 * - decoding: Set by user, if not set the native format will be chosen.
1822 */
1823 enum PixelFormat (*get_format)(struct AVCodecContext *s, const enum PixelFormat * fmt);
1824
1825 /**
1826 * DTG active format information (additional aspect ratio
1827 * information only used in DVB MPEG-2 transport streams)
1828 * 0 if not set.
1829 *
1830 * - encoding: unused
1831 * - decoding: Set by decoder.
1832 */
1833 int dtg_active_format;
1834#define FF_DTG_AFD_SAME 8
1835#define FF_DTG_AFD_4_3 9
1836#define FF_DTG_AFD_16_9 10
1837#define FF_DTG_AFD_14_9 11
1838#define FF_DTG_AFD_4_3_SP_14_9 13
1839#define FF_DTG_AFD_16_9_SP_14_9 14
1840#define FF_DTG_AFD_SP_4_3 15
1841
1842 /**
1843 * maximum motion estimation search range in subpel units
1844 * If 0 then no limit.
1845 *
1846 * - encoding: Set by user.
1847 * - decoding: unused
1848 */
1849 int me_range;
1850
1851 /**
1852 * intra quantizer bias
1853 * - encoding: Set by user.
1854 * - decoding: unused
1855 */
1856 int intra_quant_bias;
1857#define FF_DEFAULT_QUANT_BIAS 999999
1858
1859 /**
1860 * inter quantizer bias
1861 * - encoding: Set by user.
1862 * - decoding: unused
1863 */
1864 int inter_quant_bias;
1865
1866 /**
1867 * color table ID
1868 * - encoding: unused
1869 * - decoding: Which clrtable should be used for 8bit RGB images.
1870 * Tables have to be stored somewhere. FIXME
1871 */
1872 int color_table_id;
1873
1874 /**
1875 * internal_buffer count
1876 * Don't touch, used by libavcodec default_get_buffer().
1877 */
1878 int internal_buffer_count;
1879
1880 /**
1881 * internal_buffers
1882 * Don't touch, used by libavcodec default_get_buffer().
1883 */
1884 void *internal_buffer;
1885
1886#define FF_LAMBDA_SHIFT 7
1887#define FF_LAMBDA_SCALE (1<<FF_LAMBDA_SHIFT)
1888#define FF_QP2LAMBDA 118 ///< factor to convert from H.263 QP to lambda
1889#define FF_LAMBDA_MAX (256*128-1)
1890
1891#define FF_QUALITY_SCALE FF_LAMBDA_SCALE //FIXME maybe remove
1892 /**
1893 * Global quality for codecs which cannot change it per frame.
1894 * This should be proportional to MPEG-1/2/4 qscale.
1895 * - encoding: Set by user.
1896 * - decoding: unused
1897 */
1898 int global_quality;
1899
1900#define FF_CODER_TYPE_VLC 0
1901#define FF_CODER_TYPE_AC 1
1902#define FF_CODER_TYPE_RAW 2
1903#define FF_CODER_TYPE_RLE 3
1904#define FF_CODER_TYPE_DEFLATE 4
1905 /**
1906 * coder type
1907 * - encoding: Set by user.
1908 * - decoding: unused
1909 */
1910 int coder_type;
1911
1912 /**
1913 * context model
1914 * - encoding: Set by user.
1915 * - decoding: unused
1916 */
1917 int context_model;
1918#if 0
1919 /**
1920 *
1921 * - encoding: unused
1922 * - decoding: Set by user.
1923 */
1924 uint8_t * (*realloc)(struct AVCodecContext *s, uint8_t *buf, int buf_size);
1925#endif
1926
1927 /**
1928 * slice flags
1929 * - encoding: unused
1930 * - decoding: Set by user.
1931 */
1932 int slice_flags;
1933#define SLICE_FLAG_CODED_ORDER 0x0001 ///< draw_horiz_band() is called in coded order instead of display
1934#define SLICE_FLAG_ALLOW_FIELD 0x0002 ///< allow draw_horiz_band() with field slices (MPEG2 field pics)
1935#define SLICE_FLAG_ALLOW_PLANE 0x0004 ///< allow draw_horiz_band() with 1 component at a time (SVQ1)
1936
1937 /**
1938 * XVideo Motion Acceleration
1939 * - encoding: forbidden
1940 * - decoding: set by decoder
1941 */
1942 int xvmc_acceleration;
1943
1944 /**
1945 * macroblock decision mode
1946 * - encoding: Set by user.
1947 * - decoding: unused
1948 */
1949 int mb_decision;
1950#define FF_MB_DECISION_SIMPLE 0 ///< uses mb_cmp
1951#define FF_MB_DECISION_BITS 1 ///< chooses the one which needs the fewest bits
1952#define FF_MB_DECISION_RD 2 ///< rate distortion
1953
1954 /**
1955 * custom intra quantization matrix
1956 * - encoding: Set by user, can be NULL.
1957 * - decoding: Set by libavcodec.
1958 */
1959 uint16_t *intra_matrix;
1960
1961 /**
1962 * custom inter quantization matrix
1963 * - encoding: Set by user, can be NULL.
1964 * - decoding: Set by libavcodec.
1965 */
1966 uint16_t *inter_matrix;
1967
1968 /**
1969 * fourcc from the AVI stream header (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A').
1970 * This is used to work around some encoder bugs.
1971 * - encoding: unused
1972 * - decoding: Set by user, will be converted to uppercase by libavcodec during init.
1973 */
1974 unsigned int stream_codec_tag;
1975
1976 /**
1977 * scene change detection threshold
1978 * 0 is default, larger means fewer detected scene changes.
1979 * - encoding: Set by user.
1980 * - decoding: unused
1981 */
1982 int scenechange_threshold;
1983
1984 /**
1985 * minimum Lagrange multipler
1986 * - encoding: Set by user.
1987 * - decoding: unused
1988 */
1989 int lmin;
1990
1991 /**
1992 * maximum Lagrange multipler
1993 * - encoding: Set by user.
1994 * - decoding: unused
1995 */
1996 int lmax;
1997
1998 /**
1999 * palette control structure
2000 * - encoding: ??? (no palette-enabled encoder yet)
2001 * - decoding: Set by user.
2002 */
2003 struct AVPaletteControl *palctrl;
2004
2005 /**
2006 * noise reduction strength
2007 * - encoding: Set by user.
2008 * - decoding: unused
2009 */
2010 int noise_reduction;
2011
2012 /**
2013 * Called at the beginning of a frame to get cr buffer for it.
2014 * Buffer type (size, hints) must be the same. libavcodec won't check it.
2015 * libavcodec will pass previous buffer in pic, function should return
2016 * same buffer or new buffer with old frame "painted" into it.
2017 * If pic.data[0] == NULL must behave like get_buffer().
2018 * if CODEC_CAP_DR1 is not set then reget_buffer() must call
2019 * avcodec_default_reget_buffer() instead of providing buffers allocated by
2020 * some other means.
2021 * - encoding: unused
2022 * - decoding: Set by libavcodec., user can override
2023 */
2024 int (*reget_buffer)(struct AVCodecContext *c, AVFrame *pic);
2025
2026 /**
2027 * Number of bits which should be loaded into the rc buffer before decoding starts.
2028 * - encoding: Set by user.
2029 * - decoding: unused
2030 */
2031 int rc_initial_buffer_occupancy;
2032
2033 /**
2034 *
2035 * - encoding: Set by user.
2036 * - decoding: unused
2037 */
2038 int inter_threshold;
2039
2040 /**
2041 * CODEC_FLAG2_*
2042 * - encoding: Set by user.
2043 * - decoding: Set by user.
2044 */
2045 int flags2;
2046
2047 /**
2048 * Simulates errors in the bitstream to test error concealment.
2049 * - encoding: Set by user.
2050 * - decoding: unused
2051 */
2052 int error_rate;
2053
2054 /**
2055 * MP3 antialias algorithm, see FF_AA_* below.
2056 * - encoding: unused
2057 * - decoding: Set by user.
2058 */
2059 int antialias_algo;
2060#define FF_AA_AUTO 0
2061#define FF_AA_FASTINT 1 //not implemented yet
2062#define FF_AA_INT 2
2063#define FF_AA_FLOAT 3
2064 /**
2065 * quantizer noise shaping
2066 * - encoding: Set by user.
2067 * - decoding: unused
2068 */
2069 int quantizer_noise_shaping;
2070
2071 /**
2072 * thread count
2073 * is used to decide how many independent tasks should be passed to execute()
2074 * - encoding: Set by user.
2075 * - decoding: Set by user.
2076 */
2077 int thread_count;
2078
2079 /**
2080 * The codec may call this to execute several independent things.
2081 * It will return only after finishing all tasks.
2082 * The user may replace this with some multithreaded implementation,
2083 * the default implementation will execute the parts serially.
2084 * @param count the number of things to execute
2085 * - encoding: Set by libavcodec, user can override.
2086 * - decoding: Set by libavcodec, user can override.
2087 */
2088 int (*execute)(struct AVCodecContext *c, int (*func)(struct AVCodecContext *c2, void *arg), void *arg2, int *ret, int count, int size);
2089
2090 /**
2091 * thread opaque
2092 * Can be used by execute() to store some per AVCodecContext stuff.
2093 * - encoding: set by execute()
2094 * - decoding: set by execute()
2095 */
2096 void *thread_opaque;
2097
2098 /**
2099 * Motion estimation threshold below which no motion estimation is
2100 * performed, but instead the user specified motion vectors are used.
2101 *
2102 * - encoding: Set by user.
2103 * - decoding: unused
2104 */
2105 int me_threshold;
2106
2107 /**
2108 * Macroblock threshold below which the user specified macroblock types will be used.
2109 * - encoding: Set by user.
2110 * - decoding: unused
2111 */
2112 int mb_threshold;
2113
2114 /**
2115 * precision of the intra DC coefficient - 8
2116 * - encoding: Set by user.
2117 * - decoding: unused
2118 */
2119 int intra_dc_precision;
2120
2121 /**
2122 * noise vs. sse weight for the nsse comparsion function
2123 * - encoding: Set by user.
2124 * - decoding: unused
2125 */
2126 int nsse_weight;
2127
2128 /**
2129 * Number of macroblock rows at the top which are skipped.
2130 * - encoding: unused
2131 * - decoding: Set by user.
2132 */
2133 int skip_top;
2134
2135 /**
2136 * Number of macroblock rows at the bottom which are skipped.
2137 * - encoding: unused
2138 * - decoding: Set by user.
2139 */
2140 int skip_bottom;
2141
2142 /**
2143 * profile
2144 * - encoding: Set by user.
2145 * - decoding: Set by libavcodec.
2146 */
2147 int profile;
2148#define FF_PROFILE_UNKNOWN -99
2149
2150#define FF_PROFILE_AAC_MAIN 0
2151#define FF_PROFILE_AAC_LOW 1
2152#define FF_PROFILE_AAC_SSR 2
2153#define FF_PROFILE_AAC_LTP 3
2154
2155#define FF_PROFILE_H264_BASELINE 66
2156#define FF_PROFILE_H264_MAIN 77
2157#define FF_PROFILE_H264_EXTENDED 88
2158#define FF_PROFILE_H264_HIGH 100
2159#define FF_PROFILE_H264_HIGH_10 110
2160#define FF_PROFILE_H264_HIGH_422 122
2161#define FF_PROFILE_H264_HIGH_444 244
2162#define FF_PROFILE_H264_CAVLC_444 44
2163
2164 /**
2165 * level
2166 * - encoding: Set by user.
2167 * - decoding: Set by libavcodec.
2168 */
2169 int level;
2170#define FF_LEVEL_UNKNOWN -99
2171
2172 /**
2173 * low resolution decoding, 1-> 1/2 size, 2->1/4 size
2174 * - encoding: unused
2175 * - decoding: Set by user.
2176 */
2177 int lowres;
2178
2179 /**
2180 * Bitstream width / height, may be different from width/height if lowres
2181 * or other things are used.
2182 * - encoding: unused
2183 * - decoding: Set by user before init if known. Codec should override / dynamically change if needed.
2184 */
2185 int coded_width, coded_height;
2186
2187 /**
2188 * frame skip threshold
2189 * - encoding: Set by user.
2190 * - decoding: unused
2191 */
2192 int frame_skip_threshold;
2193
2194 /**
2195 * frame skip factor
2196 * - encoding: Set by user.
2197 * - decoding: unused
2198 */
2199 int frame_skip_factor;
2200
2201 /**
2202 * frame skip exponent
2203 * - encoding: Set by user.
2204 * - decoding: unused
2205 */
2206 int frame_skip_exp;
2207
2208 /**
2209 * frame skip comparison function
2210 * - encoding: Set by user.
2211 * - decoding: unused
2212 */
2213 int frame_skip_cmp;
2214
2215 /**
2216 * Border processing masking, raises the quantizer for mbs on the borders
2217 * of the picture.
2218 * - encoding: Set by user.
2219 * - decoding: unused
2220 */
2221 float border_masking;
2222
2223 /**
2224 * minimum MB lagrange multipler
2225 * - encoding: Set by user.
2226 * - decoding: unused
2227 */
2228 int mb_lmin;
2229
2230 /**
2231 * maximum MB lagrange multipler
2232 * - encoding: Set by user.
2233 * - decoding: unused
2234 */
2235 int mb_lmax;
2236
2237 /**
2238 *
2239 * - encoding: Set by user.
2240 * - decoding: unused
2241 */
2242 int me_penalty_compensation;
2243
2244 /**
2245 *
2246 * - encoding: unused
2247 * - decoding: Set by user.
2248 */
2249 enum AVDiscard skip_loop_filter;
2250
2251 /**
2252 *
2253 * - encoding: unused
2254 * - decoding: Set by user.
2255 */
2256 enum AVDiscard skip_idct;
2257
2258 /**
2259 *
2260 * - encoding: unused
2261 * - decoding: Set by user.
2262 */
2263 enum AVDiscard skip_frame;
2264
2265 /**
2266 *
2267 * - encoding: Set by user.
2268 * - decoding: unused
2269 */
2270 int bidir_refine;
2271
2272 /**
2273 *
2274 * - encoding: Set by user.
2275 * - decoding: unused
2276 */
2277 int brd_scale;
2278
2279 /**
2280 * constant rate factor - quality-based VBR - values ~correspond to qps
2281 * - encoding: Set by user.
2282 * - decoding: unused
2283 */
2284 float crf;
2285
2286 /**
2287 * constant quantization parameter rate control method
2288 * - encoding: Set by user.
2289 * - decoding: unused
2290 */
2291 int cqp;
2292
2293 /**
2294 * minimum GOP size
2295 * - encoding: Set by user.
2296 * - decoding: unused
2297 */
2298 int keyint_min;
2299
2300 /**
2301 * number of reference frames
2302 * - encoding: Set by user.
2303 * - decoding: Set by lavc.
2304 */
2305 int refs;
2306
2307 /**
2308 * chroma qp offset from luma
2309 * - encoding: Set by user.
2310 * - decoding: unused
2311 */
2312 int chromaoffset;
2313
2314 /**
2315 * Influences how often B-frames are used.
2316 * - encoding: Set by user.
2317 * - decoding: unused
2318 */
2319 int bframebias;
2320
2321 /**
2322 * trellis RD quantization
2323 * - encoding: Set by user.
2324 * - decoding: unused
2325 */
2326 int trellis;
2327
2328 /**
2329 * Reduce fluctuations in qp (before curve compression).
2330 * - encoding: Set by user.
2331 * - decoding: unused
2332 */
2333 float complexityblur;
2334
2335 /**
2336 * in-loop deblocking filter alphac0 parameter
2337 * alpha is in the range -6...6
2338 * - encoding: Set by user.
2339 * - decoding: unused
2340 */
2341 int deblockalpha;
2342
2343 /**
2344 * in-loop deblocking filter beta parameter
2345 * beta is in the range -6...6
2346 * - encoding: Set by user.
2347 * - decoding: unused
2348 */
2349 int deblockbeta;
2350
2351 /**
2352 * macroblock subpartition sizes to consider - p8x8, p4x4, b8x8, i8x8, i4x4
2353 * - encoding: Set by user.
2354 * - decoding: unused
2355 */
2356 int partitions;
2357#define X264_PART_I4X4 0x001 /* Analyze i4x4 */
2358#define X264_PART_I8X8 0x002 /* Analyze i8x8 (requires 8x8 transform) */
2359#define X264_PART_P8X8 0x010 /* Analyze p16x8, p8x16 and p8x8 */
2360#define X264_PART_P4X4 0x020 /* Analyze p8x4, p4x8, p4x4 */
2361#define X264_PART_B8X8 0x100 /* Analyze b16x8, b8x16 and b8x8 */
2362
2363 /**
2364 * direct MV prediction mode - 0 (none), 1 (spatial), 2 (temporal), 3 (auto)
2365 * - encoding: Set by user.
2366 * - decoding: unused
2367 */
2368 int directpred;
2369
2370 /**
2371 * Audio cutoff bandwidth (0 means "automatic")
2372 * - encoding: Set by user.
2373 * - decoding: unused
2374 */
2375 int cutoff;
2376
2377 /**
2378 * Multiplied by qscale for each frame and added to scene_change_score.
2379 * - encoding: Set by user.
2380 * - decoding: unused
2381 */
2382 int scenechange_factor;
2383
2384 /**
2385 *
2386 * Note: Value depends upon the compare function used for fullpel ME.
2387 * - encoding: Set by user.
2388 * - decoding: unused
2389 */
2390 int mv0_threshold;
2391
2392 /**
2393 * Adjusts sensitivity of b_frame_strategy 1.
2394 * - encoding: Set by user.
2395 * - decoding: unused
2396 */
2397 int b_sensitivity;
2398
2399 /**
2400 * - encoding: Set by user.
2401 * - decoding: unused
2402 */
2403 int compression_level;
2404#define FF_COMPRESSION_DEFAULT -1
2405
2406 /**
2407 * Sets whether to use LPC mode - used by FLAC encoder.
2408 * - encoding: Set by user.
2409 * - decoding: unused
2410 */
2411 int use_lpc;
2412
2413 /**
2414 * LPC coefficient precision - used by FLAC encoder
2415 * - encoding: Set by user.
2416 * - decoding: unused
2417 */
2418 int lpc_coeff_precision;
2419
2420 /**
2421 * - encoding: Set by user.
2422 * - decoding: unused
2423 */
2424 int min_prediction_order;
2425
2426 /**
2427 * - encoding: Set by user.
2428 * - decoding: unused
2429 */
2430 int max_prediction_order;
2431
2432 /**
2433 * search method for selecting prediction order
2434 * - encoding: Set by user.
2435 * - decoding: unused
2436 */
2437 int prediction_order_method;
2438
2439 /**
2440 * - encoding: Set by user.
2441 * - decoding: unused
2442 */
2443 int min_partition_order;
2444
2445 /**
2446 * - encoding: Set by user.
2447 * - decoding: unused
2448 */
2449 int max_partition_order;
2450
2451 /**
2452 * GOP timecode frame start number, in non drop frame format
2453 * - encoding: Set by user.
2454 * - decoding: unused
2455 */
2456 int64_t timecode_frame_start;
2457
2458#if LIBAVCODEC_VERSION_MAJOR < 53
2459 /**
2460 * Decoder should decode to this many channels if it can (0 for default)
2461 * - encoding: unused
2462 * - decoding: Set by user.
2463 * @deprecated Deprecated in favor of request_channel_layout.
2464 */
2465 int request_channels;
2466#endif
2467
2468 /**
2469 * Percentage of dynamic range compression to be applied by the decoder.
2470 * The default value is 1.0, corresponding to full compression.
2471 * - encoding: unused
2472 * - decoding: Set by user.
2473 */
2474 float drc_scale;
2475
2476 /**
2477 * opaque 64bit number (generally a PTS) that will be reordered and
2478 * output in AVFrame.reordered_opaque
2479 * - encoding: unused
2480 * - decoding: Set by user.
2481 */
2482 int64_t reordered_opaque;
2483
2484 /**
2485 * Bits per sample/pixel of internal libavcodec pixel/sample format.
2486 * This field is applicable only when sample_fmt is SAMPLE_FMT_S32.
2487 * - encoding: set by user.
2488 * - decoding: set by libavcodec.
2489 */
2490 int bits_per_raw_sample;
2491
2492 /**
2493 * Audio channel layout.
2494 * - encoding: set by user.
2495 * - decoding: set by libavcodec.
2496 */
2497 int64_t channel_layout;
2498
2499 /**
2500 * Request decoder to use this channel layout if it can (0 for default)
2501 * - encoding: unused
2502 * - decoding: Set by user.
2503 */
2504 int64_t request_channel_layout;
2505
2506 /**
2507 * Ratecontrol attempt to use, at maximum, <value> of what can be used without an underflow.
2508 * - encoding: Set by user.
2509 * - decoding: unused.
2510 */
2511 float rc_max_available_vbv_use;
2512
2513 /**
2514 * Ratecontrol attempt to use, at least, <value> times the amount needed to prevent a vbv overflow.
2515 * - encoding: Set by user.
2516 * - decoding: unused.
2517 */
2518 float rc_min_vbv_overflow_use;
2519
2520 /**
2521 * Hardware accelerator in use
2522 * - encoding: unused.
2523 * - decoding: Set by libavcodec
2524 */
2525 struct AVHWAccel *hwaccel;
2526
2527 /**
2528 * For some codecs, the time base is closer to the field rate than the frame rate.
2529 * Most notably, H.264 and MPEG-2 specify time_base as half of frame duration
2530 * if no telecine is used ...
2531 *
2532 * Set to time_base ticks per frame. Default 1, e.g., H.264/MPEG-2 set it to 2.
2533 */
2534 int ticks_per_frame;
2535
2536 /**
2537 * Hardware accelerator context.
2538 * For some hardware accelerators, a global context needs to be
2539 * provided by the user. In that case, this holds display-dependent
2540 * data FFmpeg cannot instantiate itself. Please refer to the
2541 * FFmpeg HW accelerator documentation to know how to fill this
2542 * is. e.g. for VA API, this is a struct vaapi_context.
2543 * - encoding: unused
2544 * - decoding: Set by user
2545 */
2546 void *hwaccel_context;
2547
2548 /**
2549 * Chromaticity coordinates of the source primaries.
2550 * - encoding: Set by user
2551 * - decoding: Set by libavcodec
2552 */
2553 enum AVColorPrimaries color_primaries;
2554
2555 /**
2556 * Color Transfer Characteristic.
2557 * - encoding: Set by user
2558 * - decoding: Set by libavcodec
2559 */
2560 enum AVColorTransferCharacteristic color_trc;
2561
2562 /**
2563 * YUV colorspace type.
2564 * - encoding: Set by user
2565 * - decoding: Set by libavcodec
2566 */
2567 enum AVColorSpace colorspace;
2568
2569 /**
2570 * MPEG vs JPEG YUV range.
2571 * - encoding: Set by user
2572 * - decoding: Set by libavcodec
2573 */
2574 enum AVColorRange color_range;
2575
2576 /**
2577 * This defines the location of chroma samples.
2578 * - encoding: Set by user
2579 * - decoding: Set by libavcodec
2580 */
2581 enum AVChromaLocation chroma_sample_location;
2582
2583 /**
2584 * The codec may call this to execute several independent things.
2585 * It will return only after finishing all tasks.
2586 * The user may replace this with some multithreaded implementation,
2587 * the default implementation will execute the parts serially.
2588 * Also see avcodec_thread_init and e.g. the --enable-pthread configure option.
2589 * @param c context passed also to func
2590 * @param count the number of things to execute
2591 * @param arg2 argument passed unchanged to func
2592 * @param ret return values of executed functions, must have space for "count" values. May be NULL.
2593 * @param func function that will be called count times, with jobnr from 0 to count-1.
2594 * threadnr will be in the range 0 to c->thread_count-1 < MAX_THREADS and so that no
2595 * two instances of func executing at the same time will have the same threadnr.
2596 * @return always 0 currently, but code should handle a future improvement where when any call to func
2597 * returns < 0 no further calls to func may be done and < 0 is returned.
2598 * - encoding: Set by libavcodec, user can override.
2599 * - decoding: Set by libavcodec, user can override.
2600 */
2601 int (*execute2)(struct AVCodecContext *c, int (*func)(struct AVCodecContext *c2, void *arg, int jobnr, int threadnr), void *arg2, int *ret, int count);
2602
2603 /**
2604 * explicit P-frame weighted prediction analysis method
2605 * 0: off
2606 * 1: fast blind weighting (one reference duplicate with -1 offset)
2607 * 2: smart weighting (full fade detection analysis)
2608 * - encoding: Set by user.
2609 * - decoding: unused
2610 */
2611 int weighted_p_pred;
2612
2613 /**
2614 * AQ mode
2615 * 0: Disabled
2616 * 1: Variance AQ (complexity mask)
2617 * 2: Auto-variance AQ (experimental)
2618 * - encoding: Set by user
2619 * - decoding: unused
2620 */
2621 int aq_mode;
2622
2623 /**
2624 * AQ strength
2625 * Reduces blocking and blurring in flat and textured areas.
2626 * - encoding: Set by user
2627 * - decoding: unused
2628 */
2629 float aq_strength;
2630
2631 /**
2632 * PSY RD
2633 * Strength of psychovisual optimization
2634 * - encoding: Set by user
2635 * - decoding: unused
2636 */
2637 float psy_rd;
2638
2639 /**
2640 * PSY trellis
2641 * Strength of psychovisual optimization
2642 * - encoding: Set by user
2643 * - decoding: unused
2644 */
2645 float psy_trellis;
2646
2647 /**
2648 * RC lookahead
2649 * Number of frames for frametype and ratecontrol lookahead
2650 * - encoding: Set by user
2651 * - decoding: unused
2652 */
2653 int rc_lookahead;
2654} AVCodecContext;
2655
2656/**
2657 * AVCodec.
2658 */
2659typedef struct AVCodec {
2660 /**
2661 * Name of the codec implementation.
2662 * The name is globally unique among encoders and among decoders (but an
2663 * encoder and a decoder can share the same name).
2664 * This is the primary way to find a codec from the user perspective.
2665 */
2666 const char *name;
2667 enum AVMediaType type;
2668 enum CodecID id;
2669 int priv_data_size;
2670 int (*init)(AVCodecContext *);
2671 int (*encode)(AVCodecContext *, uint8_t *buf, int buf_size, void *data);
2672 int (*close)(AVCodecContext *);
2673 int (*decode)(AVCodecContext *, void *outdata, int *outdata_size, AVPacket *avpkt);
2674 /**
2675 * Codec capabilities.
2676 * see CODEC_CAP_*
2677 */
2678 int capabilities;
2679 struct AVCodec *next;
2680 /**
2681 * Flush buffers.
2682 * Will be called when seeking
2683 */
2684 void (*flush)(AVCodecContext *);
2685 //const AVRational *supported_framerates; ///< array of supported framerates, or NULL if any, array is terminated by {0,0}
2686 const enum PixelFormat *pix_fmts; ///< array of supported pixel formats, or NULL if unknown, array is terminated by -1
2687 /**
2688 * Descriptive name for the codec, meant to be more human readable than name.
2689 * You should use the NULL_IF_CONFIG_SMALL() macro to define it.
2690 */
2691 const char *long_name;
2692 const int *supported_samplerates; ///< array of supported audio samplerates, or NULL if unknown, array is terminated by 0
2693 const enum SampleFormat *sample_fmts; ///< array of supported sample formats, or NULL if unknown, array is terminated by -1
2694 const int64_t *channel_layouts; ///< array of support channel layouts, or NULL if unknown. array is terminated by 0
2695} AVCodec;
2696
2697/**
2698 * AVHWAccel.
2699 */
2700typedef struct AVHWAccel {
2701 /**
2702 * Name of the hardware accelerated codec.
2703 * The name is globally unique among encoders and among decoders (but an
2704 * encoder and a decoder can share the same name).
2705 */
2706 const char *name;
2707
2708 /**
2709 * Type of codec implemented by the hardware accelerator.
2710 *
2711 * See AVMEDIA_TYPE_xxx
2712 */
2713 enum AVMediaType type;
2714
2715 /**
2716 * Codec implemented by the hardware accelerator.
2717 *
2718 * See CODEC_ID_xxx
2719 */
2720 enum CodecID id;
2721
2722 /**
2723 * Supported pixel format.
2724 *
2725 * Only hardware accelerated formats are supported here.
2726 */
2727 //enum PixelFormat pix_fmt;
2728
2729 /**
2730 * Hardware accelerated codec capabilities.
2731 * see FF_HWACCEL_CODEC_CAP_*
2732 */
2733 int capabilities;
2734
2735 struct AVHWAccel *next;
2736
2737 /**
2738 * Called at the beginning of each frame or field picture.
2739 *
2740 * Meaningful frame information (codec specific) is guaranteed to
2741 * be parsed at this point. This function is mandatory.
2742 *
2743 * Note that buf can be NULL along with buf_size set to 0.
2744 * Otherwise, this means the whole frame is available at this point.
2745 *
2746 * @param avctx the codec context
2747 * @param buf the frame data buffer base
2748 * @param buf_size the size of the frame in bytes
2749 * @return zero if successful, a negative value otherwise
2750 */
2751 int (*start_frame)(AVCodecContext *avctx, const uint8_t *buf, uint32_t buf_size);
2752
2753 /**
2754 * Callback for each slice.
2755 *
2756 * Meaningful slice information (codec specific) is guaranteed to
2757 * be parsed at this point. This function is mandatory.
2758 *
2759 * @param avctx the codec context
2760 * @param buf the slice data buffer base
2761 * @param buf_size the size of the slice in bytes
2762 * @return zero if successful, a negative value otherwise
2763 */
2764 int (*decode_slice)(AVCodecContext *avctx, const uint8_t *buf, uint32_t buf_size);
2765
2766 /**
2767 * Called at the end of each frame or field picture.
2768 *
2769 * The whole picture is parsed at this point and can now be sent
2770 * to the hardware accelerator. This function is mandatory.
2771 *
2772 * @param avctx the codec context
2773 * @return zero if successful, a negative value otherwise
2774 */
2775 int (*end_frame)(AVCodecContext *avctx);
2776
2777 /**
2778 * Size of HW accelerator private data.
2779 *
2780 * Private data is allocated with av_mallocz() before
2781 * AVCodecContext.get_buffer() and deallocated after
2782 * AVCodecContext.release_buffer().
2783 */
2784 int priv_data_size;
2785} AVHWAccel;
2786
2787/**
2788 * four components are given, that's all.
2789 * the last component is alpha
2790 */
2791typedef struct AVPicture {
2792 uint8_t *data[4];
2793 int linesize[4]; ///< number of bytes per line
2794} AVPicture;
2795
2796#if LIBAVCODEC_VERSION_MAJOR < 53
2797/**
2798 * AVPaletteControl
2799 * This structure defines a method for communicating palette changes
2800 * between and demuxer and a decoder.
2801 *
2802 * @deprecated Use AVPacket to send palette changes instead.
2803 * This is totally broken.
2804 */
2805#define AVPALETTE_SIZE 1024
2806#define AVPALETTE_COUNT 256
2807typedef struct AVPaletteControl {
2808
2809 /* Demuxer sets this to 1 to indicate the palette has changed;
2810 * decoder resets to 0. */
2811 int palette_changed;
2812
2813 /* 4-byte ARGB palette entries, stored in native byte order; note that
2814 * the individual palette components should be on a 8-bit scale; if
2815 * the palette data comes from an IBM VGA native format, the component
2816 * data is probably 6 bits in size and needs to be scaled. */
2817 unsigned int palette[AVPALETTE_COUNT];
2818
2819} AVPaletteControl attribute_deprecated;
2820#endif
2821
2822enum AVSubtitleType {
2823 SUBTITLE_NONE,
2824
2825 SUBTITLE_BITMAP, ///< A bitmap, pict will be set
2826
2827 /**
2828 * Plain text, the text field must be set by the decoder and is
2829 * authoritative. ass and pict fields may contain approximations.
2830 */
2831 SUBTITLE_TEXT,
2832
2833 /**
2834 * Formatted text, the ass field must be set by the decoder and is
2835 * authoritative. pict and text fields may contain approximations.
2836 */
2837 SUBTITLE_ASS,
2838};
2839
2840typedef struct AVSubtitleRect {
2841 int x; ///< top left corner of pict, undefined when pict is not set
2842 int y; ///< top left corner of pict, undefined when pict is not set
2843 int w; ///< width of pict, undefined when pict is not set
2844 int h; ///< height of pict, undefined when pict is not set
2845 int nb_colors; ///< number of colors in pict, undefined when pict is not set
2846
2847 /**
2848 * data+linesize for the bitmap of this subtitle.
2849 * can be set for text/ass as well once they where rendered
2850 */
2851 AVPicture pict;
2852 enum AVSubtitleType type;
2853
2854 char *text; ///< 0 terminated plain UTF-8 text
2855
2856 /**
2857 * 0 terminated ASS/SSA compatible event line.
2858 * The pressentation of this is unaffected by the other values in this
2859 * struct.
2860 */
2861 char *ass;
2862} AVSubtitleRect;
2863
2864typedef struct AVSubtitle {
2865 uint16_t format; /* 0 = graphics */
2866 uint32_t start_display_time; /* relative to packet pts, in ms */
2867 uint32_t end_display_time; /* relative to packet pts, in ms */
2868 unsigned num_rects;
2869 AVSubtitleRect **rects;
2870 int64_t pts; ///< Same as packet pts, in AV_TIME_BASE
2871} AVSubtitle;
2872
2873/* packet functions */
2874
2875/**
2876 * @deprecated use NULL instead
2877 */
2878attribute_deprecated void av_destruct_packet_nofree(AVPacket *pkt);
2879
2880/**
2881 * Default packet destructor.
2882 */
2883void av_destruct_packet(AVPacket *pkt);
2884
2885/**
2886 * Initialize optional fields of a packet with default values.
2887 *
2888 * @param pkt packet
2889 */
2890void av_init_packet(AVPacket *pkt);
2891
2892/**
2893 * Allocate the payload of a packet and initialize its fields with
2894 * default values.
2895 *
2896 * @param pkt packet
2897 * @param size wanted payload size
2898 * @return 0 if OK, AVERROR_xxx otherwise
2899 */
2900int av_new_packet(AVPacket *pkt, int size);
2901
2902/**
2903 * Reduce packet size, correctly zeroing padding
2904 *
2905 * @param pkt packet
2906 * @param size new size
2907 */
2908void av_shrink_packet(AVPacket *pkt, int size);
2909
2910/**
2911 * @warning This is a hack - the packet memory allocation stuff is broken. The
2912 * packet is allocated if it was not really allocated.
2913 */
2914int av_dup_packet(AVPacket *pkt);
2915
2916/**
2917 * Free a packet.
2918 *
2919 * @param pkt packet to free
2920 */
2921void av_free_packet(AVPacket *pkt);
2922
2923/* resample.c */
2924
2925struct ReSampleContext;
2926struct AVResampleContext;
2927
2928typedef struct ReSampleContext ReSampleContext;
2929
2930#if LIBAVCODEC_VERSION_MAJOR < 53
2931/**
2932 * @deprecated Use av_audio_resample_init() instead.
2933 */
2934attribute_deprecated ReSampleContext *audio_resample_init(int output_channels, int input_channels,
2935 int output_rate, int input_rate);
2936#endif
2937/**
2938 * Initializes audio resampling context
2939 *
2940 * @param output_channels number of output channels
2941 * @param input_channels number of input channels
2942 * @param output_rate output sample rate
2943 * @param input_rate input sample rate
2944 * @param sample_fmt_out requested output sample format
2945 * @param sample_fmt_in input sample format
2946 * @param filter_length length of each FIR filter in the filterbank relative to the cutoff freq
2947 * @param log2_phase_count log2 of the number of entries in the polyphase filterbank
2948 * @param linear If 1 then the used FIR filter will be linearly interpolated
2949 between the 2 closest, if 0 the closest will be used
2950 * @param cutoff cutoff frequency, 1.0 corresponds to half the output sampling rate
2951 * @return allocated ReSampleContext, NULL if error occured
2952 */
2953ReSampleContext *av_audio_resample_init(int output_channels, int input_channels,
2954 int output_rate, int input_rate,
2955 enum SampleFormat sample_fmt_out,
2956 enum SampleFormat sample_fmt_in,
2957 int filter_length, int log2_phase_count,
2958 int linear, double cutoff);
2959
2960int audio_resample(ReSampleContext *s, short *output, short *input, int nb_samples);
2961void audio_resample_close(ReSampleContext *s);
2962
2963
2964/**
2965 * Initializes an audio resampler.
2966 * Note, if either rate is not an integer then simply scale both rates up so they are.
2967 * @param filter_length length of each FIR filter in the filterbank relative to the cutoff freq
2968 * @param log2_phase_count log2 of the number of entries in the polyphase filterbank
2969 * @param linear If 1 then the used FIR filter will be linearly interpolated
2970 between the 2 closest, if 0 the closest will be used
2971 * @param cutoff cutoff frequency, 1.0 corresponds to half the output sampling rate
2972 */
2973struct AVResampleContext *av_resample_init(int out_rate, int in_rate, int filter_length, int log2_phase_count, int linear, double cutoff);
2974
2975/**
2976 * resamples.
2977 * @param src an array of unconsumed samples
2978 * @param consumed the number of samples of src which have been consumed are returned here
2979 * @param src_size the number of unconsumed samples available
2980 * @param dst_size the amount of space in samples available in dst
2981 * @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.
2982 * @return the number of samples written in dst or -1 if an error occurred
2983 */
2984int av_resample(struct AVResampleContext *c, short *dst, short *src, int *consumed, int src_size, int dst_size, int update_ctx);
2985
2986
2987/**
2988 * Compensates samplerate/timestamp drift. The compensation is done by changing
2989 * the resampler parameters, so no audible clicks or similar distortions occur
2990 * @param compensation_distance distance in output samples over which the compensation should be performed
2991 * @param sample_delta number of output samples which should be output less
2992 *
2993 * example: av_resample_compensate(c, 10, 500)
2994 * here instead of 510 samples only 500 samples would be output
2995 *
2996 * note, due to rounding the actual compensation might be slightly different,
2997 * especially if the compensation_distance is large and the in_rate used during init is small
2998 */
2999void av_resample_compensate(struct AVResampleContext *c, int sample_delta, int compensation_distance);
3000void av_resample_close(struct AVResampleContext *c);
3001
3002/**
3003 * Allocate memory for a picture. Call avpicture_free to free it.
3004 *
3005 * @param picture the picture to be filled in
3006 * @param pix_fmt the format of the picture
3007 * @param width the width of the picture
3008 * @param height the height of the picture
3009 * @return zero if successful, a negative value if not
3010 */
3011int avpicture_alloc(AVPicture *picture, enum PixelFormat pix_fmt, int width, int height);
3012
3013/**
3014 * Free a picture previously allocated by avpicture_alloc().
3015 *
3016 * @param picture the AVPicture to be freed
3017 */
3018void avpicture_free(AVPicture *picture);
3019
3020/**
3021 * Fill in the AVPicture fields.
3022 * The fields of the given AVPicture are filled in by using the 'ptr' address
3023 * which points to the image data buffer. Depending on the specified picture
3024 * format, one or multiple image data pointers and line sizes will be set.
3025 * If a planar format is specified, several pointers will be set pointing to
3026 * the different picture planes and the line sizes of the different planes
3027 * will be stored in the lines_sizes array.
3028 * Call with ptr == NULL to get the required size for the ptr buffer.
3029 *
3030 * @param picture AVPicture whose fields are to be filled in
3031 * @param ptr Buffer which will contain or contains the actual image data
3032 * @param pix_fmt The format in which the picture data is stored.
3033 * @param width the width of the image in pixels
3034 * @param height the height of the image in pixels
3035 * @return size of the image data in bytes
3036 */
3037int avpicture_fill(AVPicture *picture, uint8_t *ptr,
3038 enum PixelFormat pix_fmt, int width, int height);
3039int avpicture_layout(const AVPicture* src, enum PixelFormat pix_fmt, int width, int height,
3040 unsigned char *dest, int dest_size);
3041
3042/**
3043 * Calculate the size in bytes that a picture of the given width and height
3044 * would occupy if stored in the given picture format.
3045 * Note that this returns the size of a compact representation as generated
3046 * by avpicture_layout, which can be smaller than the size required for e.g.
3047 * avpicture_fill.
3048 *
3049 * @param pix_fmt the given picture format
3050 * @param width the width of the image
3051 * @param height the height of the image
3052 * @return Image data size in bytes or -1 on error (e.g. too large dimensions).
3053 */
3054int avpicture_get_size(enum PixelFormat pix_fmt, int width, int height);
3055void avcodec_get_chroma_sub_sample(enum PixelFormat pix_fmt, int *h_shift, int *v_shift);
3056const char *avcodec_get_pix_fmt_name(enum PixelFormat pix_fmt);
3057void avcodec_set_dimensions(AVCodecContext *s, int width, int height);
3058
3059#if LIBAVCODEC_VERSION_MAJOR < 53
3060/**
3061 * Returns the pixel format corresponding to the name name.
3062 *
3063 * If there is no pixel format with name name, then looks for a
3064 * pixel format with the name corresponding to the native endian
3065 * format of name.
3066 * For example in a little-endian system, first looks for "gray16",
3067 * then for "gray16le".
3068 *
3069 * Finally if no pixel format has been found, returns PIX_FMT_NONE.
3070 *
3071 * @deprecated Deprecated in favor of av_get_pix_fmt().
3072 */
3073attribute_deprecated enum PixelFormat avcodec_get_pix_fmt(const char* name);
3074#endif
3075
3076/**
3077 * Returns a value representing the fourCC code associated to the
3078 * pixel format pix_fmt, or 0 if no associated fourCC code can be
3079 * found.
3080 */
3081unsigned int avcodec_pix_fmt_to_codec_tag(enum PixelFormat pix_fmt);
3082
3083#define FF_LOSS_RESOLUTION 0x0001 /**< loss due to resolution change */
3084#define FF_LOSS_DEPTH 0x0002 /**< loss due to color depth change */
3085#define FF_LOSS_COLORSPACE 0x0004 /**< loss due to color space conversion */
3086#define FF_LOSS_ALPHA 0x0008 /**< loss of alpha bits */
3087#define FF_LOSS_COLORQUANT 0x0010 /**< loss due to color quantization */
3088#define FF_LOSS_CHROMA 0x0020 /**< loss of chroma (e.g. RGB to gray conversion) */
3089
3090/**
3091 * Computes what kind of losses will occur when converting from one specific
3092 * pixel format to another.
3093 * When converting from one pixel format to another, information loss may occur.
3094 * For example, when converting from RGB24 to GRAY, the color information will
3095 * be lost. Similarly, other losses occur when converting from some formats to
3096 * other formats. These losses can involve loss of chroma, but also loss of
3097 * resolution, loss of color depth, loss due to the color space conversion, loss
3098 * of the alpha bits or loss due to color quantization.
3099 * avcodec_get_fix_fmt_loss() informs you about the various types of losses
3100 * which will occur when converting from one pixel format to another.
3101 *
3102 * @param[in] dst_pix_fmt destination pixel format
3103 * @param[in] src_pix_fmt source pixel format
3104 * @param[in] has_alpha Whether the source pixel format alpha channel is used.
3105 * @return Combination of flags informing you what kind of losses will occur.
3106 */
3107int avcodec_get_pix_fmt_loss(enum PixelFormat dst_pix_fmt, enum PixelFormat src_pix_fmt,
3108 int has_alpha);
3109
3110/**
3111 * Finds the best pixel format to convert to given a certain source pixel
3112 * format. When converting from one pixel format to another, information loss
3113 * may occur. For example, when converting from RGB24 to GRAY, the color
3114 * information will be lost. Similarly, other losses occur when converting from
3115 * some formats to other formats. avcodec_find_best_pix_fmt() searches which of
3116 * the given pixel formats should be used to suffer the least amount of loss.
3117 * The pixel formats from which it chooses one, are determined by the
3118 * pix_fmt_mask parameter.
3119 *
3120 * @code
3121 * src_pix_fmt = PIX_FMT_YUV420P;
3122 * pix_fmt_mask = (1 << PIX_FMT_YUV422P) || (1 << PIX_FMT_RGB24);
3123 * dst_pix_fmt = avcodec_find_best_pix_fmt(pix_fmt_mask, src_pix_fmt, alpha, &loss);
3124 * @endcode
3125 *
3126 * @param[in] pix_fmt_mask bitmask determining which pixel format to choose from
3127 * @param[in] src_pix_fmt source pixel format
3128 * @param[in] has_alpha Whether the source pixel format alpha channel is used.
3129 * @param[out] loss_ptr Combination of flags informing you what kind of losses will occur.
3130 * @return The best pixel format to convert to or -1 if none was found.
3131 */
3132enum PixelFormat avcodec_find_best_pix_fmt(int64_t pix_fmt_mask, enum PixelFormat src_pix_fmt,
3133 int has_alpha, int *loss_ptr);
3134
3135
3136/**
3137 * Print in buf the string corresponding to the pixel format with
3138 * number pix_fmt, or an header if pix_fmt is negative.
3139 *
3140 * @param[in] buf the buffer where to write the string
3141 * @param[in] buf_size the size of buf
3142 * @param[in] pix_fmt the number of the pixel format to print the corresponding info string, or
3143 * a negative value to print the corresponding header.
3144 * Meaningful values for obtaining a pixel format info vary from 0 to PIX_FMT_NB -1.
3145 */
3146void avcodec_pix_fmt_string (char *buf, int buf_size, enum PixelFormat pix_fmt);
3147
3148#define FF_ALPHA_TRANSP 0x0001 /* image has some totally transparent pixels */
3149#define FF_ALPHA_SEMI_TRANSP 0x0002 /* image has some transparent pixels */
3150
3151/**
3152 * Tell if an image really has transparent alpha values.
3153 * @return ored mask of FF_ALPHA_xxx constants
3154 */
3155int img_get_alpha_info(const AVPicture *src,
3156 enum PixelFormat pix_fmt, int width, int height);
3157
3158/* deinterlace a picture */
3159/* deinterlace - if not supported return -1 */
3160int avpicture_deinterlace(AVPicture *dst, const AVPicture *src,
3161 enum PixelFormat pix_fmt, int width, int height);
3162
3163/* external high level API */
3164
3165/**
3166 * If c is NULL, returns the first registered codec,
3167 * if c is non-NULL, returns the next registered codec after c,
3168 * or NULL if c is the last one.
3169 */
3170AVCodec *av_codec_next(AVCodec *c);
3171
3172/**
3173 * Returns the LIBAVCODEC_VERSION_INT constant.
3174 */
3175unsigned avcodec_version(void);
3176
3177/**
3178 * Returns the libavcodec build-time configuration.
3179 */
3180const char *avcodec_configuration(void);
3181
3182/**
3183 * Returns the libavcodec license.
3184 */
3185const char *avcodec_license(void);
3186
3187/**
3188 * Initializes libavcodec.
3189 *
3190 * @warning This function must be called before any other libavcodec
3191 * function.
3192 */
3193void avcodec_init(void);
3194
3195#if LIBAVCODEC_VERSION_MAJOR < 53
3196/**
3197 * @deprecated Deprecated in favor of avcodec_register().
3198 */
3199attribute_deprecated void register_avcodec(AVCodec *codec);
3200#endif
3201
3202/**
3203 * Register the codec codec and initialize libavcodec.
3204 *
3205 * @see avcodec_init()
3206 */
3207void avcodec_register(AVCodec *codec);
3208
3209/**
3210 * Finds a registered encoder with a matching codec ID.
3211 *
3212 * @param id CodecID of the requested encoder
3213 * @return An encoder if one was found, NULL otherwise.
3214 */
3215AVCodec *avcodec_find_encoder(enum CodecID id);
3216
3217/**
3218 * Finds a registered encoder with the specified name.
3219 *
3220 * @param name name of the requested encoder
3221 * @return An encoder if one was found, NULL otherwise.
3222 */
3223AVCodec *avcodec_find_encoder_by_name(const char *name);
3224
3225/**
3226 * Finds a registered decoder with a matching codec ID.
3227 *
3228 * @param id CodecID of the requested decoder
3229 * @return A decoder if one was found, NULL otherwise.
3230 */
3231AVCodec *avcodec_find_decoder(enum CodecID id);
3232
3233/**
3234 * Finds a registered decoder with the specified name.
3235 *
3236 * @param name name of the requested decoder
3237 * @return A decoder if one was found, NULL otherwise.
3238 */
3239AVCodec *avcodec_find_decoder_by_name(const char *name);
3240void avcodec_string(char *buf, int buf_size, AVCodecContext *enc, int encode);
3241
3242/**
3243 * Sets the fields of the given AVCodecContext to default values.
3244 *
3245 * @param s The AVCodecContext of which the fields should be set to default values.
3246 */
3247void avcodec_get_context_defaults(AVCodecContext *s);
3248
3249/** THIS FUNCTION IS NOT YET PART OF THE PUBLIC API!
3250 * we WILL change its arguments and name a few times! */
3251void avcodec_get_context_defaults2(AVCodecContext *s, enum AVMediaType);
3252
3253/**
3254 * Allocates an AVCodecContext and sets its fields to default values. The
3255 * resulting struct can be deallocated by simply calling av_free().
3256 *
3257 * @return An AVCodecContext filled with default values or NULL on failure.
3258 * @see avcodec_get_context_defaults
3259 */
3260AVCodecContext *avcodec_alloc_context(void);
3261
3262/** THIS FUNCTION IS NOT YET PART OF THE PUBLIC API!
3263 * we WILL change its arguments and name a few times! */
3264AVCodecContext *avcodec_alloc_context2(enum AVMediaType);
3265
3266/**
3267 * Copy the settings of the source AVCodecContext into the destination
3268 * AVCodecContext. The resulting destination codec context will be
3269 * unopened, i.e. you are required to call avcodec_open() before you
3270 * can use this AVCodecContext to decode/encode video/audio data.
3271 *
3272 * @param dest target codec context, should be initialized with
3273 * avcodec_alloc_context(), but otherwise uninitialized
3274 * @param src source codec context
3275 * @return AVERROR() on error (e.g. memory allocation error), 0 on success
3276 */
3277int avcodec_copy_context(AVCodecContext *dest, const AVCodecContext *src);
3278
3279/**
3280 * Sets the fields of the given AVFrame to default values.
3281 *
3282 * @param pic The AVFrame of which the fields should be set to default values.
3283 */
3284void avcodec_get_frame_defaults(AVFrame *pic);
3285
3286/**
3287 * Allocates an AVFrame and sets its fields to default values. The resulting
3288 * struct can be deallocated by simply calling av_free().
3289 *
3290 * @return An AVFrame filled with default values or NULL on failure.
3291 * @see avcodec_get_frame_defaults
3292 */
3293AVFrame *avcodec_alloc_frame(void);
3294
3295int avcodec_default_get_buffer(AVCodecContext *s, AVFrame *pic);
3296void avcodec_default_release_buffer(AVCodecContext *s, AVFrame *pic);
3297int avcodec_default_reget_buffer(AVCodecContext *s, AVFrame *pic);
3298
3299/**
3300 * Returns the amount of padding in pixels which the get_buffer callback must
3301 * provide around the edge of the image for codecs which do not have the
3302 * CODEC_FLAG_EMU_EDGE flag.
3303 *
3304 * @return Required padding in pixels.
3305 */
3306unsigned avcodec_get_edge_width(void);
3307/**
3308 * Modifies width and height values so that they will result in a memory
3309 * buffer that is acceptable for the codec if you do not use any horizontal
3310 * padding.
3311 */
3312void avcodec_align_dimensions(AVCodecContext *s, int *width, int *height);
3313/**
3314 * Modifies width and height values so that they will result in a memory
3315 * buffer that is acceptable for the codec if you also ensure that all
3316 * line sizes are a multiple of the respective linesize_align[i].
3317 */
3318void avcodec_align_dimensions2(AVCodecContext *s, int *width, int *height,
3319 int linesize_align[4]);
3320
3321/**
3322 * Checks if the given dimension of a picture is valid, meaning that all
3323 * bytes of the picture can be addressed with a signed int.
3324 *
3325 * @param[in] w Width of the picture.
3326 * @param[in] h Height of the picture.
3327 * @return Zero if valid, a negative value if invalid.
3328 */
3329int avcodec_check_dimensions(void *av_log_ctx, unsigned int w, unsigned int h);
3330enum PixelFormat avcodec_default_get_format(struct AVCodecContext *s, const enum PixelFormat * fmt);
3331
3332int avcodec_thread_init(AVCodecContext *s, int thread_count);
3333void avcodec_thread_free(AVCodecContext *s);
3334int avcodec_default_execute(AVCodecContext *c, int (*func)(AVCodecContext *c2, void *arg2),void *arg, int *ret, int count, int size);
3335int avcodec_default_execute2(AVCodecContext *c, int (*func)(AVCodecContext *c2, void *arg2, int, int),void *arg, int *ret, int count);
3336//FIXME func typedef
3337
3338/**
3339 * Initializes the AVCodecContext to use the given AVCodec. Prior to using this
3340 * function the context has to be allocated.
3341 *
3342 * The functions avcodec_find_decoder_by_name(), avcodec_find_encoder_by_name(),
3343 * avcodec_find_decoder() and avcodec_find_encoder() provide an easy way for
3344 * retrieving a codec.
3345 *
3346 * @warning This function is not thread safe!
3347 *
3348 * @code
3349 * avcodec_register_all();
3350 * codec = avcodec_find_decoder(CODEC_ID_H264);
3351 * if (!codec)
3352 * exit(1);
3353 *
3354 * context = avcodec_alloc_context();
3355 *
3356 * if (avcodec_open(context, codec) < 0)
3357 * exit(1);
3358 * @endcode
3359 *
3360 * @param avctx The context which will be set up to use the given codec.
3361 * @param codec The codec to use within the context.
3362 * @return zero on success, a negative value on error
3363 * @see avcodec_alloc_context, avcodec_find_decoder, avcodec_find_encoder
3364 */
3365int avcodec_open(AVCodecContext *avctx, AVCodec *codec);
3366
3367#if LIBAVCODEC_VERSION_MAJOR < 53
3368/**
3369 * Decodes an audio frame from buf into samples.
3370 * Wrapper function which calls avcodec_decode_audio3.
3371 *
3372 * @deprecated Use avcodec_decode_audio3 instead.
3373 * @param avctx the codec context
3374 * @param[out] samples the output buffer
3375 * @param[in,out] frame_size_ptr the output buffer size in bytes
3376 * @param[in] buf the input buffer
3377 * @param[in] buf_size the input buffer size in bytes
3378 * @return On error a negative value is returned, otherwise the number of bytes
3379 * used or zero if no frame could be decompressed.
3380 */
3381attribute_deprecated int avcodec_decode_audio2(AVCodecContext *avctx, int16_t *samples,
3382 int *frame_size_ptr,
3383 const uint8_t *buf, int buf_size);
3384#endif
3385
3386/**
3387 * Decodes the audio frame of size avpkt->size from avpkt->data into samples.
3388 * Some decoders may support multiple frames in a single AVPacket, such
3389 * decoders would then just decode the first frame. In this case,
3390 * avcodec_decode_audio3 has to be called again with an AVPacket that contains
3391 * the remaining data in order to decode the second frame etc.
3392 * If no frame
3393 * could be outputted, frame_size_ptr is zero. Otherwise, it is the
3394 * decompressed frame size in bytes.
3395 *
3396 * @warning You must set frame_size_ptr to the allocated size of the
3397 * output buffer before calling avcodec_decode_audio3().
3398 *
3399 * @warning The input buffer must be FF_INPUT_BUFFER_PADDING_SIZE larger than
3400 * the actual read bytes because some optimized bitstream readers read 32 or 64
3401 * bits at once and could read over the end.
3402 *
3403 * @warning The end of the input buffer avpkt->data should be set to 0 to ensure that
3404 * no overreading happens for damaged MPEG streams.
3405 *
3406 * @note You might have to align the input buffer avpkt->data and output buffer
3407 * samples. The alignment requirements depend on the CPU: On some CPUs it isn't
3408 * necessary at all, on others it won't work at all if not aligned and on others
3409 * it will work but it will have an impact on performance.
3410 *
3411 * In practice, avpkt->data should have 4 byte alignment at minimum and
3412 * samples should be 16 byte aligned unless the CPU doesn't need it
3413 * (AltiVec and SSE do).
3414 *
3415 * @param avctx the codec context
3416 * @param[out] samples the output buffer, sample type in avctx->sample_fmt
3417 * @param[in,out] frame_size_ptr the output buffer size in bytes
3418 * @param[in] avpkt The input AVPacket containing the input buffer.
3419 * You can create such packet with av_init_packet() and by then setting
3420 * data and size, some decoders might in addition need other fields.
3421 * All decoders are designed to use the least fields possible though.
3422 * @return On error a negative value is returned, otherwise the number of bytes
3423 * used or zero if no frame data was decompressed (used) from the input AVPacket.
3424 */
3425int avcodec_decode_audio3(AVCodecContext *avctx, int16_t *samples,
3426 int *frame_size_ptr,
3427 AVPacket *avpkt);
3428
3429#if LIBAVCODEC_VERSION_MAJOR < 53
3430/**
3431 * Decodes a video frame from buf into picture.
3432 * Wrapper function which calls avcodec_decode_video2.
3433 *
3434 * @deprecated Use avcodec_decode_video2 instead.
3435 * @param avctx the codec context
3436 * @param[out] picture The AVFrame in which the decoded video frame will be stored.
3437 * @param[in] buf the input buffer
3438 * @param[in] buf_size the size of the input buffer in bytes
3439 * @param[in,out] got_picture_ptr Zero if no frame could be decompressed, otherwise, it is nonzero.
3440 * @return On error a negative value is returned, otherwise the number of bytes
3441 * used or zero if no frame could be decompressed.
3442 */
3443attribute_deprecated int avcodec_decode_video(AVCodecContext *avctx, AVFrame *picture,
3444 int *got_picture_ptr,
3445 const uint8_t *buf, int buf_size);
3446#endif
3447
3448/**
3449 * Decodes the video frame of size avpkt->size from avpkt->data into picture.
3450 * Some decoders may support multiple frames in a single AVPacket, such
3451 * decoders would then just decode the first frame.
3452 *
3453 * @warning The input buffer must be FF_INPUT_BUFFER_PADDING_SIZE larger than
3454 * the actual read bytes because some optimized bitstream readers read 32 or 64
3455 * bits at once and could read over the end.
3456 *
3457 * @warning The end of the input buffer buf should be set to 0 to ensure that
3458 * no overreading happens for damaged MPEG streams.
3459 *
3460 * @note You might have to align the input buffer avpkt->data.
3461 * The alignment requirements depend on the CPU: on some CPUs it isn't
3462 * necessary at all, on others it won't work at all if not aligned and on others
3463 * it will work but it will have an impact on performance.
3464 *
3465 * In practice, avpkt->data should have 4 byte alignment at minimum.
3466 *
3467 * @note Some codecs have a delay between input and output, these need to be
3468 * fed with avpkt->data=NULL, avpkt->size=0 at the end to return the remaining frames.
3469 *
3470 * @param avctx the codec context
3471 * @param[out] picture The AVFrame in which the decoded video frame will be stored.
3472 * @param[in] avpkt The input AVpacket containing the input buffer.
3473 * You can create such packet with av_init_packet() and by then setting
3474 * data and size, some decoders might in addition need other fields like
3475 * flags&AV_PKT_FLAG_KEY. All decoders are designed to use the least
3476 * fields possible.
3477 * @param[in,out] got_picture_ptr Zero if no frame could be decompressed, otherwise, it is nonzero.
3478 * @return On error a negative value is returned, otherwise the number of bytes
3479 * used or zero if no frame could be decompressed.
3480 */
3481int avcodec_decode_video2(AVCodecContext *avctx, AVFrame *picture,
3482 int *got_picture_ptr,
3483 AVPacket *avpkt);
3484
3485#if LIBAVCODEC_VERSION_MAJOR < 53
3486/* Decode a subtitle message. Return -1 if error, otherwise return the
3487 * number of bytes used. If no subtitle could be decompressed,
3488 * got_sub_ptr is zero. Otherwise, the subtitle is stored in *sub. */
3489attribute_deprecated int avcodec_decode_subtitle(AVCodecContext *avctx, AVSubtitle *sub,
3490 int *got_sub_ptr,
3491 const uint8_t *buf, int buf_size);
3492#endif
3493
3494/**
3495 * Decodes a subtitle message.
3496 * Returns a negative value on error, otherwise returns the number of bytes used.
3497 * If no subtitle could be decompressed, got_sub_ptr is zero.
3498 * Otherwise, the subtitle is stored in *sub.
3499 *
3500 * @param avctx the codec context
3501 * @param[out] sub The AVSubtitle in which the decoded subtitle will be stored.
3502 * @param[in,out] got_sub_ptr Zero if no subtitle could be decompressed, otherwise, it is nonzero.
3503 * @param[in] avpkt The input AVPacket containing the input buffer.
3504 */
3505int avcodec_decode_subtitle2(AVCodecContext *avctx, AVSubtitle *sub,
3506 int *got_sub_ptr,
3507 AVPacket *avpkt);
3508int avcodec_parse_frame(AVCodecContext *avctx, uint8_t **pdata,
3509 int *data_size_ptr,
3510 uint8_t *buf, int buf_size);
3511
3512/**
3513 * Encodes an audio frame from samples into buf.
3514 *
3515 * @note The output buffer should be at least FF_MIN_BUFFER_SIZE bytes large.
3516 * However, for PCM audio the user will know how much space is needed
3517 * because it depends on the value passed in buf_size as described
3518 * below. In that case a lower value can be used.
3519 *
3520 * @param avctx the codec context
3521 * @param[out] buf the output buffer
3522 * @param[in] buf_size the output buffer size
3523 * @param[in] samples the input buffer containing the samples
3524 * The number of samples read from this buffer is frame_size*channels,
3525 * both of which are defined in avctx.
3526 * For PCM audio the number of samples read from samples is equal to
3527 * buf_size * input_sample_size / output_sample_size.
3528 * @return On error a negative value is returned, on success zero or the number
3529 * of bytes used to encode the data read from the input buffer.
3530 */
3531int avcodec_encode_audio(AVCodecContext *avctx, uint8_t *buf, int buf_size,
3532 const short *samples);
3533
3534/**
3535 * Encodes a video frame from pict into buf.
3536 * The input picture should be
3537 * stored using a specific format, namely avctx.pix_fmt.
3538 *
3539 * @param avctx the codec context
3540 * @param[out] buf the output buffer for the bitstream of encoded frame
3541 * @param[in] buf_size the size of the output buffer in bytes
3542 * @param[in] pict the input picture to encode
3543 * @return On error a negative value is returned, on success zero or the number
3544 * of bytes used from the output buffer.
3545 */
3546int avcodec_encode_video(AVCodecContext *avctx, uint8_t *buf, int buf_size,
3547 const AVFrame *pict);
3548int avcodec_encode_subtitle(AVCodecContext *avctx, uint8_t *buf, int buf_size,
3549 const AVSubtitle *sub);
3550
3551int avcodec_close(AVCodecContext *avctx);
3552
3553/**
3554 * Register all the codecs, parsers and bitstream filters which were enabled at
3555 * configuration time. If you do not call this function you can select exactly
3556 * which formats you want to support, by using the individual registration
3557 * functions.
3558 *
3559 * @see avcodec_register
3560 * @see av_register_codec_parser
3561 * @see av_register_bitstream_filter
3562 */
3563void avcodec_register_all(void);
3564
3565/**
3566 * Flush buffers, should be called when seeking or when switching to a different stream.
3567 */
3568void avcodec_flush_buffers(AVCodecContext *avctx);
3569
3570void avcodec_default_free_buffers(AVCodecContext *s);
3571
3572/* misc useful functions */
3573
3574/**
3575 * Returns a single letter to describe the given picture type pict_type.
3576 *
3577 * @param[in] pict_type the picture type
3578 * @return A single character representing the picture type.
3579 */
3580char av_get_pict_type_char(int pict_type);
3581
3582/**
3583 * Returns codec bits per sample.
3584 *
3585 * @param[in] codec_id the codec
3586 * @return Number of bits per sample or zero if unknown for the given codec.
3587 */
3588int av_get_bits_per_sample(enum CodecID codec_id);
3589
3590/**
3591 * Returns sample format bits per sample.
3592 *
3593 * @param[in] sample_fmt the sample format
3594 * @return Number of bits per sample or zero if unknown for the given sample format.
3595 */
3596int av_get_bits_per_sample_format(enum SampleFormat sample_fmt);
3597
3598/* frame parsing */
3599typedef struct AVCodecParserContext {
3600 void *priv_data;
3601 struct AVCodecParser *parser;
3602 int64_t frame_offset; /* offset of the current frame */
3603 int64_t cur_offset; /* current offset
3604 (incremented by each av_parser_parse()) */
3605 int64_t next_frame_offset; /* offset of the next frame */
3606 /* video info */
3607 int pict_type; /* XXX: Put it back in AVCodecContext. */
3608 /**
3609 * This field is used for proper frame duration computation in lavf.
3610 * It signals, how much longer the frame duration of the current frame
3611 * is compared to normal frame duration.
3612 *
3613 * frame_duration = (1 + repeat_pict) * time_base
3614 *
3615 * It is used by codecs like H.264 to display telecined material.
3616 */
3617 int repeat_pict; /* XXX: Put it back in AVCodecContext. */
3618 int64_t pts; /* pts of the current frame */
3619 int64_t dts; /* dts of the current frame */
3620
3621 /* private data */
3622 int64_t last_pts;
3623 int64_t last_dts;
3624 int fetch_timestamp;
3625
3626#define AV_PARSER_PTS_NB 4
3627 int cur_frame_start_index;
3628 int64_t cur_frame_offset[AV_PARSER_PTS_NB];
3629 int64_t cur_frame_pts[AV_PARSER_PTS_NB];
3630 int64_t cur_frame_dts[AV_PARSER_PTS_NB];
3631
3632 int flags;
3633#define PARSER_FLAG_COMPLETE_FRAMES 0x0001
3634
3635 int64_t offset; ///< byte offset from starting packet start
3636 int64_t cur_frame_end[AV_PARSER_PTS_NB];
3637
3638 /*!
3639 * Set by parser to 1 for key frames and 0 for non-key frames.
3640 * It is initialized to -1, so if the parser doesn't set this flag,
3641 * old-style fallback using FF_I_TYPE picture type as key frames
3642 * will be used.
3643 */
3644 int key_frame;
3645
3646 /**
3647 * Time difference in stream time base units from the pts of this
3648 * packet to the point at which the output from the decoder has converged
3649 * independent from the availability of previous frames. That is, the
3650 * frames are virtually identical no matter if decoding started from
3651 * the very first frame or from this keyframe.
3652 * Is AV_NOPTS_VALUE if unknown.
3653 * This field is not the display duration of the current frame.
3654 *
3655 * The purpose of this field is to allow seeking in streams that have no
3656 * keyframes in the conventional sense. It corresponds to the
3657 * recovery point SEI in H.264 and match_time_delta in NUT. It is also
3658 * essential for some types of subtitle streams to ensure that all
3659 * subtitles are correctly displayed after seeking.
3660 */
3661 int64_t convergence_duration;
3662
3663 // Timestamp generation support:
3664 /**
3665 * Synchronization point for start of timestamp generation.
3666 *
3667 * Set to >0 for sync point, 0 for no sync point and <0 for undefined
3668 * (default).
3669 *
3670 * For example, this corresponds to presence of H.264 buffering period
3671 * SEI message.
3672 */
3673 int dts_sync_point;
3674
3675 /**
3676 * Offset of the current timestamp against last timestamp sync point in
3677 * units of AVCodecContext.time_base.
3678 *
3679 * Set to INT_MIN when dts_sync_point unused. Otherwise, it must
3680 * contain a valid timestamp offset.
3681 *
3682 * Note that the timestamp of sync point has usually a nonzero
3683 * dts_ref_dts_delta, which refers to the previous sync point. Offset of
3684 * the next frame after timestamp sync point will be usually 1.
3685 *
3686 * For example, this corresponds to H.264 cpb_removal_delay.
3687 */
3688 int dts_ref_dts_delta;
3689
3690 /**
3691 * Presentation delay of current frame in units of AVCodecContext.time_base.
3692 *
3693 * Set to INT_MIN when dts_sync_point unused. Otherwise, it must
3694 * contain valid non-negative timestamp delta (presentation time of a frame
3695 * must not lie in the past).
3696 *
3697 * This delay represents the difference between decoding and presentation
3698 * time of the frame.
3699 *
3700 * For example, this corresponds to H.264 dpb_output_delay.
3701 */
3702 int pts_dts_delta;
3703
3704 /**
3705 * Position of the packet in file.
3706 *
3707 * Analogous to cur_frame_pts/dts
3708 */
3709 int64_t cur_frame_pos[AV_PARSER_PTS_NB];
3710
3711 /**
3712 * Byte position of currently parsed frame in stream.
3713 */
3714 int64_t pos;
3715
3716 /**
3717 * Previous frame byte position.
3718 */
3719 int64_t last_pos;
3720} AVCodecParserContext;
3721
3722typedef struct AVCodecParser {
3723 int codec_ids[5]; /* several codec IDs are permitted */
3724 int priv_data_size;
3725 int (*parser_init)(AVCodecParserContext *s);
3726 int (*parser_parse)(AVCodecParserContext *s,
3727 AVCodecContext *avctx,
3728 const uint8_t **poutbuf, int *poutbuf_size,
3729 const uint8_t *buf, int buf_size);
3730 void (*parser_close)(AVCodecParserContext *s);
3731 int (*split)(AVCodecContext *avctx, const uint8_t *buf, int buf_size);
3732 struct AVCodecParser *next;
3733} AVCodecParser;
3734
3735AVCodecParser *av_parser_next(AVCodecParser *c);
3736
3737void av_register_codec_parser(AVCodecParser *parser);
3738AVCodecParserContext *av_parser_init(int codec_id);
3739
3740#if LIBAVCODEC_VERSION_MAJOR < 53
3741attribute_deprecated
3742int av_parser_parse(AVCodecParserContext *s,
3743 AVCodecContext *avctx,
3744 uint8_t **poutbuf, int *poutbuf_size,
3745 const uint8_t *buf, int buf_size,
3746 int64_t pts, int64_t dts);
3747#endif
3748
3749/**
3750 * Parse a packet.
3751 *
3752 * @param s parser context.
3753 * @param avctx codec context.
3754 * @param poutbuf set to pointer to parsed buffer or NULL if not yet finished.
3755 * @param poutbuf_size set to size of parsed buffer or zero if not yet finished.
3756 * @param buf input buffer.
3757 * @param buf_size input length, to signal EOF, this should be 0 (so that the last frame can be output).
3758 * @param pts input presentation timestamp.
3759 * @param dts input decoding timestamp.
3760 * @param pos input byte position in stream.
3761 * @return the number of bytes of the input bitstream used.
3762 *
3763 * Example:
3764 * @code
3765 * while(in_len){
3766 * len = av_parser_parse2(myparser, AVCodecContext, &data, &size,
3767 * in_data, in_len,
3768 * pts, dts, pos);
3769 * in_data += len;
3770 * in_len -= len;
3771 *
3772 * if(size)
3773 * decode_frame(data, size);
3774 * }
3775 * @endcode
3776 */
3777int av_parser_parse2(AVCodecParserContext *s,
3778 AVCodecContext *avctx,
3779 uint8_t **poutbuf, int *poutbuf_size,
3780 const uint8_t *buf, int buf_size,
3781 int64_t pts, int64_t dts,
3782 int64_t pos);
3783
3784int av_parser_change(AVCodecParserContext *s,
3785 AVCodecContext *avctx,
3786 uint8_t **poutbuf, int *poutbuf_size,
3787 const uint8_t *buf, int buf_size, int keyframe);
3788void av_parser_close(AVCodecParserContext *s);
3789
3790
3791typedef struct AVBitStreamFilterContext {
3792 void *priv_data;
3793 struct AVBitStreamFilter *filter;
3794 AVCodecParserContext *parser;
3795 struct AVBitStreamFilterContext *next;
3796} AVBitStreamFilterContext;
3797
3798
3799typedef struct AVBitStreamFilter {
3800 const char *name;
3801 int priv_data_size;
3802 int (*filter)(AVBitStreamFilterContext *bsfc,
3803 AVCodecContext *avctx, const char *args,
3804 uint8_t **poutbuf, int *poutbuf_size,
3805 const uint8_t *buf, int buf_size, int keyframe);
3806 void (*close)(AVBitStreamFilterContext *bsfc);
3807 struct AVBitStreamFilter *next;
3808} AVBitStreamFilter;
3809
3810void av_register_bitstream_filter(AVBitStreamFilter *bsf);
3811AVBitStreamFilterContext *av_bitstream_filter_init(const char *name);
3812int av_bitstream_filter_filter(AVBitStreamFilterContext *bsfc,
3813 AVCodecContext *avctx, const char *args,
3814 uint8_t **poutbuf, int *poutbuf_size,
3815 const uint8_t *buf, int buf_size, int keyframe);
3816void av_bitstream_filter_close(AVBitStreamFilterContext *bsf);
3817
3818AVBitStreamFilter *av_bitstream_filter_next(AVBitStreamFilter *f);
3819
3820/* memory */
3821
3822/**
3823 * Reallocates the given block if it is not large enough, otherwise it
3824 * does nothing.
3825 *
3826 * @see av_realloc
3827 */
3828void *av_fast_realloc(void *ptr, unsigned int *size, unsigned int min_size);
3829
3830/**
3831 * Allocates a buffer, reusing the given one if large enough.
3832 *
3833 * Contrary to av_fast_realloc the current buffer contents might not be
3834 * preserved and on error the old buffer is freed, thus no special
3835 * handling to avoid memleaks is necessary.
3836 *
3837 * @param ptr pointer to pointer to already allocated buffer, overwritten with pointer to new buffer
3838 * @param size size of the buffer *ptr points to
3839 * @param min_size minimum size of *ptr buffer after returning, *ptr will be NULL and
3840 * *size 0 if an error occurred.
3841 */
3842void av_fast_malloc(void *ptr, unsigned int *size, unsigned int min_size);
3843
3844/**
3845 * Copy image 'src' to 'dst'.
3846 */
3847void av_picture_copy(AVPicture *dst, const AVPicture *src,
3848 enum PixelFormat pix_fmt, int width, int height);
3849
3850/**
3851 * Crop image top and left side.
3852 */
3853int av_picture_crop(AVPicture *dst, const AVPicture *src,
3854 enum PixelFormat pix_fmt, int top_band, int left_band);
3855
3856/**
3857 * Pad image.
3858 */
3859int av_picture_pad(AVPicture *dst, const AVPicture *src, int height, int width, enum PixelFormat pix_fmt,
3860 int padtop, int padbottom, int padleft, int padright, int *color);
3861
3862/**
3863 * Encodes extradata length to a buffer. Used by xiph codecs.
3864 *
3865 * @param s buffer to write to; must be at least (v/255+1) bytes long
3866 * @param v size of extradata in bytes
3867 * @return number of bytes written to the buffer.
3868 */
3869unsigned int av_xiphlacing(unsigned char *s, unsigned int v);
3870
3871/**
3872 * Parses str and put in width_ptr and height_ptr the detected values.
3873 *
3874 * @return 0 in case of a successful parsing, a negative value otherwise
3875 * @param[in] str the string to parse: it has to be a string in the format
3876 * <width>x<height> or a valid video frame size abbreviation.
3877 * @param[in,out] width_ptr pointer to the variable which will contain the detected
3878 * frame width value
3879 * @param[in,out] height_ptr pointer to the variable which will contain the detected
3880 * frame height value
3881 */
3882int av_parse_video_frame_size(int *width_ptr, int *height_ptr, const char *str);
3883
3884/**
3885 * Parses str and put in frame_rate the detected values.
3886 *
3887 * @return 0 in case of a successful parsing, a negative value otherwise
3888 * @param[in] str the string to parse: it has to be a string in the format
3889 * <frame_rate_num>/<frame_rate_den>, a float number or a valid video rate abbreviation
3890 * @param[in,out] frame_rate pointer to the AVRational which will contain the detected
3891 * frame rate
3892 */
3893//int av_parse_video_frame_rate(AVRational *frame_rate, const char *str);
3894
3895/**
3896 * Logs a generic warning message about a missing feature. This function is
3897 * intended to be used internally by FFmpeg (libavcodec, libavformat, etc.)
3898 * only, and would normally not be used by applications.
3899 * @param[in] avc a pointer to an arbitrary struct of which the first field is
3900 * a pointer to an AVClass struct
3901 * @param[in] feature string containing the name of the missing feature
3902 * @param[in] want_sample indicates if samples are wanted which exhibit this feature.
3903 * If want_sample is non-zero, additional verbage will be added to the log
3904 * message which tells the user how to report samples to the development
3905 * mailing list.
3906 */
3907void av_log_missing_feature(void *avc, const char *feature, int want_sample);
3908
3909/**
3910 * Logs a generic warning message asking for a sample. This function is
3911 * intended to be used internally by FFmpeg (libavcodec, libavformat, etc.)
3912 * only, and would normally not be used by applications.
3913 * @param[in] avc a pointer to an arbitrary struct of which the first field is
3914 * a pointer to an AVClass struct
3915 * @param[in] msg string containing an optional message, or NULL if no message
3916 */
3917void av_log_ask_for_sample(void *avc, const char *msg);
3918
3919/**
3920 * Registers the hardware accelerator hwaccel.
3921 */
3922void av_register_hwaccel(AVHWAccel *hwaccel);
3923
3924/**
3925 * If hwaccel is NULL, returns the first registered hardware accelerator,
3926 * if hwaccel is non-NULL, returns the next registered hardware accelerator
3927 * after hwaccel, or NULL if hwaccel is the last one.
3928 */
3929AVHWAccel *av_hwaccel_next(AVHWAccel *hwaccel);
3930
3931
3932/**
3933 * Lock operation used by lockmgr
3934 */
3935enum AVLockOp {
3936 AV_LOCK_CREATE, ///< Create a mutex
3937 AV_LOCK_OBTAIN, ///< Lock the mutex
3938 AV_LOCK_RELEASE, ///< Unlock the mutex
3939 AV_LOCK_DESTROY, ///< Free mutex resources
3940};
3941
3942/**
3943 * Register a user provided lock manager supporting the operations
3944 * specified by AVLockOp. mutex points to a (void *) where the
3945 * lockmgr should store/get a pointer to a user allocated mutex. It's
3946 * NULL upon AV_LOCK_CREATE and != NULL for all other ops.
3947 *
3948 * @param cb User defined callback. Note: FFmpeg may invoke calls to this
3949 * callback during the call to av_lockmgr_register().
3950 * Thus, the application must be prepared to handle that.
3951 * If cb is set to NULL the lockmgr will be unregistered.
3952 * Also note that during unregistration the previously registered
3953 * lockmgr callback may also be invoked.
3954 */
3955int av_lockmgr_register(int (*cb)(void **mutex, enum AVLockOp op));
3956
3957#endif /* AVCODEC_AVCODEC_H */
generated by cgit v1.2.3 (git 2.39.1) at 2024-09-27 15:24:15 +0000