RoQ audio encoder
[libav.git] / libavcodec / avcodec.h
1 /*
2 * copyright (c) 2001 Fabrice Bellard
3 *
4 * This file is part of FFmpeg.
5 *
6 * FFmpeg is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
10 *
11 * FFmpeg is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
15 *
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with FFmpeg; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
19 */
20
21 #ifndef AVCODEC_H
22 #define AVCODEC_H
23
24 /**
25 * @file avcodec.h
26 * external API header
27 */
28
29
30 #ifdef __cplusplus
31 extern "C" {
32 #endif
33
34 #include "avutil.h"
35 #include <sys/types.h> /* size_t */
36
37 #define AV_STRINGIFY(s) AV_TOSTRING(s)
38 #define AV_TOSTRING(s) #s
39
40 #define LIBAVCODEC_VERSION_INT ((51<<16)+(40<<8)+4)
41 #define LIBAVCODEC_VERSION 51.40.4
42 #define LIBAVCODEC_BUILD LIBAVCODEC_VERSION_INT
43
44 #define LIBAVCODEC_IDENT "Lavc" AV_STRINGIFY(LIBAVCODEC_VERSION)
45
46 #define AV_NOPTS_VALUE INT64_C(0x8000000000000000)
47 #define AV_TIME_BASE 1000000
48 #define AV_TIME_BASE_Q (AVRational){1, AV_TIME_BASE}
49
50 /**
51 *
52 * If you add a codec ID to this list, add it so that
53 * 1. no value of a existing codec ID changes (that would break ABI),
54 * 2. it is as close as possible to similar codecs.
55 */
56 enum CodecID {
57 CODEC_ID_NONE,
58 CODEC_ID_MPEG1VIDEO,
59 CODEC_ID_MPEG2VIDEO, /* preferred ID for MPEG-1/2 video decoding */
60 CODEC_ID_MPEG2VIDEO_XVMC,
61 CODEC_ID_H261,
62 CODEC_ID_H263,
63 CODEC_ID_RV10,
64 CODEC_ID_RV20,
65 CODEC_ID_MJPEG,
66 CODEC_ID_MJPEGB,
67 CODEC_ID_LJPEG,
68 CODEC_ID_SP5X,
69 CODEC_ID_JPEGLS,
70 CODEC_ID_MPEG4,
71 CODEC_ID_RAWVIDEO,
72 CODEC_ID_MSMPEG4V1,
73 CODEC_ID_MSMPEG4V2,
74 CODEC_ID_MSMPEG4V3,
75 CODEC_ID_WMV1,
76 CODEC_ID_WMV2,
77 CODEC_ID_H263P,
78 CODEC_ID_H263I,
79 CODEC_ID_FLV1,
80 CODEC_ID_SVQ1,
81 CODEC_ID_SVQ3,
82 CODEC_ID_DVVIDEO,
83 CODEC_ID_HUFFYUV,
84 CODEC_ID_CYUV,
85 CODEC_ID_H264,
86 CODEC_ID_INDEO3,
87 CODEC_ID_VP3,
88 CODEC_ID_THEORA,
89 CODEC_ID_ASV1,
90 CODEC_ID_ASV2,
91 CODEC_ID_FFV1,
92 CODEC_ID_4XM,
93 CODEC_ID_VCR1,
94 CODEC_ID_CLJR,
95 CODEC_ID_MDEC,
96 CODEC_ID_ROQ,
97 CODEC_ID_INTERPLAY_VIDEO,
98 CODEC_ID_XAN_WC3,
99 CODEC_ID_XAN_WC4,
100 CODEC_ID_RPZA,
101 CODEC_ID_CINEPAK,
102 CODEC_ID_WS_VQA,
103 CODEC_ID_MSRLE,
104 CODEC_ID_MSVIDEO1,
105 CODEC_ID_IDCIN,
106 CODEC_ID_8BPS,
107 CODEC_ID_SMC,
108 CODEC_ID_FLIC,
109 CODEC_ID_TRUEMOTION1,
110 CODEC_ID_VMDVIDEO,
111 CODEC_ID_MSZH,
112 CODEC_ID_ZLIB,
113 CODEC_ID_QTRLE,
114 CODEC_ID_SNOW,
115 CODEC_ID_TSCC,
116 CODEC_ID_ULTI,
117 CODEC_ID_QDRAW,
118 CODEC_ID_VIXL,
119 CODEC_ID_QPEG,
120 CODEC_ID_XVID,
121 CODEC_ID_PNG,
122 CODEC_ID_PPM,
123 CODEC_ID_PBM,
124 CODEC_ID_PGM,
125 CODEC_ID_PGMYUV,
126 CODEC_ID_PAM,
127 CODEC_ID_FFVHUFF,
128 CODEC_ID_RV30,
129 CODEC_ID_RV40,
130 CODEC_ID_VC1,
131 CODEC_ID_WMV3,
132 CODEC_ID_LOCO,
133 CODEC_ID_WNV1,
134 CODEC_ID_AASC,
135 CODEC_ID_INDEO2,
136 CODEC_ID_FRAPS,
137 CODEC_ID_TRUEMOTION2,
138 CODEC_ID_BMP,
139 CODEC_ID_CSCD,
140 CODEC_ID_MMVIDEO,
141 CODEC_ID_ZMBV,
142 CODEC_ID_AVS,
143 CODEC_ID_SMACKVIDEO,
144 CODEC_ID_NUV,
145 CODEC_ID_KMVC,
146 CODEC_ID_FLASHSV,
147 CODEC_ID_CAVS,
148 CODEC_ID_JPEG2000,
149 CODEC_ID_VMNC,
150 CODEC_ID_VP5,
151 CODEC_ID_VP6,
152 CODEC_ID_VP6F,
153 CODEC_ID_TARGA,
154 CODEC_ID_DSICINVIDEO,
155 CODEC_ID_TIERTEXSEQVIDEO,
156 CODEC_ID_TIFF,
157 CODEC_ID_GIF,
158 CODEC_ID_FFH264,
159 CODEC_ID_DXA,
160 CODEC_ID_DNXHD,
161 CODEC_ID_THP,
162 CODEC_ID_SGI,
163 CODEC_ID_C93,
164 CODEC_ID_BETHSOFTVID,
165 CODEC_ID_PTX,
166
167 /* various PCM "codecs" */
168 CODEC_ID_PCM_S16LE= 0x10000,
169 CODEC_ID_PCM_S16BE,
170 CODEC_ID_PCM_U16LE,
171 CODEC_ID_PCM_U16BE,
172 CODEC_ID_PCM_S8,
173 CODEC_ID_PCM_U8,
174 CODEC_ID_PCM_MULAW,
175 CODEC_ID_PCM_ALAW,
176 CODEC_ID_PCM_S32LE,
177 CODEC_ID_PCM_S32BE,
178 CODEC_ID_PCM_U32LE,
179 CODEC_ID_PCM_U32BE,
180 CODEC_ID_PCM_S24LE,
181 CODEC_ID_PCM_S24BE,
182 CODEC_ID_PCM_U24LE,
183 CODEC_ID_PCM_U24BE,
184 CODEC_ID_PCM_S24DAUD,
185
186 /* various ADPCM codecs */
187 CODEC_ID_ADPCM_IMA_QT= 0x11000,
188 CODEC_ID_ADPCM_IMA_WAV,
189 CODEC_ID_ADPCM_IMA_DK3,
190 CODEC_ID_ADPCM_IMA_DK4,
191 CODEC_ID_ADPCM_IMA_WS,
192 CODEC_ID_ADPCM_IMA_SMJPEG,
193 CODEC_ID_ADPCM_MS,
194 CODEC_ID_ADPCM_4XM,
195 CODEC_ID_ADPCM_XA,
196 CODEC_ID_ADPCM_ADX,
197 CODEC_ID_ADPCM_EA,
198 CODEC_ID_ADPCM_G726,
199 CODEC_ID_ADPCM_CT,
200 CODEC_ID_ADPCM_SWF,
201 CODEC_ID_ADPCM_YAMAHA,
202 CODEC_ID_ADPCM_SBPRO_4,
203 CODEC_ID_ADPCM_SBPRO_3,
204 CODEC_ID_ADPCM_SBPRO_2,
205 CODEC_ID_ADPCM_THP,
206
207 /* AMR */
208 CODEC_ID_AMR_NB= 0x12000,
209 CODEC_ID_AMR_WB,
210
211 /* RealAudio codecs*/
212 CODEC_ID_RA_144= 0x13000,
213 CODEC_ID_RA_288,
214
215 /* various DPCM codecs */
216 CODEC_ID_ROQ_DPCM= 0x14000,
217 CODEC_ID_INTERPLAY_DPCM,
218 CODEC_ID_XAN_DPCM,
219 CODEC_ID_SOL_DPCM,
220
221 CODEC_ID_MP2= 0x15000,
222 CODEC_ID_MP3, /* preferred ID for decoding MPEG audio layer 1, 2 or 3 */
223 CODEC_ID_AAC,
224 #if LIBAVCODEC_VERSION_INT < ((52<<16)+(0<<8)+0)
225 CODEC_ID_MPEG4AAC,
226 #endif
227 CODEC_ID_AC3,
228 CODEC_ID_DTS,
229 CODEC_ID_VORBIS,
230 CODEC_ID_DVAUDIO,
231 CODEC_ID_WMAV1,
232 CODEC_ID_WMAV2,
233 CODEC_ID_MACE3,
234 CODEC_ID_MACE6,
235 CODEC_ID_VMDAUDIO,
236 CODEC_ID_SONIC,
237 CODEC_ID_SONIC_LS,
238 CODEC_ID_FLAC,
239 CODEC_ID_MP3ADU,
240 CODEC_ID_MP3ON4,
241 CODEC_ID_SHORTEN,
242 CODEC_ID_ALAC,
243 CODEC_ID_WESTWOOD_SND1,
244 CODEC_ID_GSM, /* as in Berlin toast format */
245 CODEC_ID_QDM2,
246 CODEC_ID_COOK,
247 CODEC_ID_TRUESPEECH,
248 CODEC_ID_TTA,
249 CODEC_ID_SMACKAUDIO,
250 CODEC_ID_QCELP,
251 CODEC_ID_WAVPACK,
252 CODEC_ID_DSICINAUDIO,
253 CODEC_ID_IMC,
254 CODEC_ID_MUSEPACK7,
255 CODEC_ID_MLP,
256 CODEC_ID_GSM_MS, /* as found in WAV */
257 CODEC_ID_ATRAC3,
258
259 /* subtitle codecs */
260 CODEC_ID_DVD_SUBTITLE= 0x17000,
261 CODEC_ID_DVB_SUBTITLE,
262
263 CODEC_ID_MPEG2TS= 0x20000, /* _FAKE_ codec to indicate a raw MPEG-2 TS
264 * stream (only used by libavformat) */
265 };
266
267 #if LIBAVCODEC_VERSION_INT < ((52<<16)+(0<<8)+0)
268 /* CODEC_ID_MP3LAME is obsolete */
269 #define CODEC_ID_MP3LAME CODEC_ID_MP3
270 #define CODEC_ID_MPEG4AAC CODEC_ID_AAC
271 #endif
272
273 enum CodecType {
274 CODEC_TYPE_UNKNOWN = -1,
275 CODEC_TYPE_VIDEO,
276 CODEC_TYPE_AUDIO,
277 CODEC_TYPE_DATA,
278 CODEC_TYPE_SUBTITLE,
279 CODEC_TYPE_NB
280 };
281
282 /* Currently unused, may be used if 24/32 bits samples are ever supported. */
283 /* all in native-endian format */
284 enum SampleFormat {
285 SAMPLE_FMT_NONE = -1,
286 SAMPLE_FMT_U8, ///< unsigned 8 bits
287 SAMPLE_FMT_S16, ///< signed 16 bits
288 SAMPLE_FMT_S24, ///< signed 24 bits
289 SAMPLE_FMT_S32, ///< signed 32 bits
290 SAMPLE_FMT_FLT, ///< float
291 };
292
293 /* in bytes */
294 #define AVCODEC_MAX_AUDIO_FRAME_SIZE 192000 // 1 second of 48khz 32bit audio
295
296 /**
297 * Required number of additionally allocated bytes at the end of the input bitstream for decoding.
298 * This is mainly needed because some optimized bitstream readers read
299 * 32 or 64 bit at once and could read over the end.<br>
300 * Note: If the first 23 bits of the additional bytes are not 0, then damaged
301 * MPEG bitstreams could cause overread and segfault.
302 */
303 #define FF_INPUT_BUFFER_PADDING_SIZE 8
304
305 /**
306 * minimum encoding buffer size
307 * Used to avoid some checks during header writing.
308 */
309 #define FF_MIN_BUFFER_SIZE 16384
310
311 /* motion estimation type, EPZS by default */
312 enum Motion_Est_ID {
313 ME_ZERO = 1,
314 ME_FULL,
315 ME_LOG,
316 ME_PHODS,
317 ME_EPZS,
318 ME_X1,
319 ME_HEX,
320 ME_UMH,
321 ME_ITER,
322 };
323
324 enum AVDiscard{
325 /* We leave some space between them for extensions (drop some
326 * keyframes for intra-only or drop just some bidir frames). */
327 AVDISCARD_NONE =-16, ///< discard nothing
328 AVDISCARD_DEFAULT= 0, ///< discard useless packets like 0 size packets in avi
329 AVDISCARD_NONREF = 8, ///< discard all non reference
330 AVDISCARD_BIDIR = 16, ///< discard all bidirectional frames
331 AVDISCARD_NONKEY = 32, ///< discard all frames except keyframes
332 AVDISCARD_ALL = 48, ///< discard all
333 };
334
335 typedef struct RcOverride{
336 int start_frame;
337 int end_frame;
338 int qscale; // If this is 0 then quality_factor will be used instead.
339 float quality_factor;
340 } RcOverride;
341
342 #define FF_MAX_B_FRAMES 16
343
344 /* encoding support
345 These flags can be passed in AVCodecContext.flags before initialization.
346 Note: Not everything is supported yet.
347 */
348
349 #define CODEC_FLAG_QSCALE 0x0002 ///< Use fixed qscale.
350 #define CODEC_FLAG_4MV 0x0004 ///< 4 MV per MB allowed / advanced prediction for H.263.
351 #define CODEC_FLAG_QPEL 0x0010 ///< Use qpel MC.
352 #define CODEC_FLAG_GMC 0x0020 ///< Use GMC.
353 #define CODEC_FLAG_MV0 0x0040 ///< Always try a MB with MV=<0,0>.
354 #define CODEC_FLAG_PART 0x0080 ///< Use data partitioning.
355 /* The parent program guarantees that the input for B-frames containing
356 * streams is not written to for at least s->max_b_frames+1 frames, if
357 * this is not set the input will be copied. */
358 #define CODEC_FLAG_INPUT_PRESERVED 0x0100
359 #define CODEC_FLAG_PASS1 0x0200 ///< Use internal 2pass ratecontrol in first pass mode.
360 #define CODEC_FLAG_PASS2 0x0400 ///< Use internal 2pass ratecontrol in second pass mode.
361 #define CODEC_FLAG_EXTERN_HUFF 0x1000 ///< Use external Huffman table (for MJPEG).
362 #define CODEC_FLAG_GRAY 0x2000 ///< Only decode/encode grayscale.
363 #define CODEC_FLAG_EMU_EDGE 0x4000///< Don't draw edges.
364 #define CODEC_FLAG_PSNR 0x8000 ///< error[?] variables will be set during encoding.
365 #define CODEC_FLAG_TRUNCATED 0x00010000 /** Input bitstream might be truncated at a random location instead
366 of only at frame boundaries. */
367 #define CODEC_FLAG_NORMALIZE_AQP 0x00020000 ///< Normalize adaptive quantization.
368 #define CODEC_FLAG_INTERLACED_DCT 0x00040000 ///< Use interlaced DCT.
369 #define CODEC_FLAG_LOW_DELAY 0x00080000 ///< Force low delay.
370 #define CODEC_FLAG_ALT_SCAN 0x00100000 ///< Use alternate scan.
371 #define CODEC_FLAG_TRELLIS_QUANT 0x00200000 ///< Use trellis quantization.
372 #define CODEC_FLAG_GLOBAL_HEADER 0x00400000 ///< Place global headers in extradata instead of every keyframe.
373 #define CODEC_FLAG_BITEXACT 0x00800000 ///< Use only bitexact stuff (except (I)DCT).
374 /* Fx : Flag for h263+ extra options */
375 #if LIBAVCODEC_VERSION_INT < ((52<<16)+(0<<8)+0)
376 #define CODEC_FLAG_H263P_AIC 0x01000000 ///< H.263 advanced intra coding / MPEG-4 AC prediction (remove this)
377 #endif
378 #define CODEC_FLAG_AC_PRED 0x01000000 ///< H.263 advanced intra coding / MPEG-4 AC prediction
379 #define CODEC_FLAG_H263P_UMV 0x02000000 ///< unlimited motion vector
380 #define CODEC_FLAG_CBP_RD 0x04000000 ///< Use rate distortion optimization for cbp.
381 #define CODEC_FLAG_QP_RD 0x08000000 ///< Use rate distortion optimization for qp selectioon.
382 #define CODEC_FLAG_H263P_AIV 0x00000008 ///< H.263 alternative inter VLC
383 #define CODEC_FLAG_OBMC 0x00000001 ///< OBMC
384 #define CODEC_FLAG_LOOP_FILTER 0x00000800 ///< loop filter
385 #define CODEC_FLAG_H263P_SLICE_STRUCT 0x10000000
386 #define CODEC_FLAG_INTERLACED_ME 0x20000000 ///< interlaced motion estimation
387 #define CODEC_FLAG_SVCD_SCAN_OFFSET 0x40000000 ///< Will reserve space for SVCD scan offset user data.
388 #define CODEC_FLAG_CLOSED_GOP ((int)0x80000000)
389 #define CODEC_FLAG2_FAST 0x00000001 ///< Allow non spec compliant speedup tricks.
390 #define CODEC_FLAG2_STRICT_GOP 0x00000002 ///< Strictly enforce GOP size.
391 #define CODEC_FLAG2_NO_OUTPUT 0x00000004 ///< Skip bitstream encoding.
392 #define CODEC_FLAG2_LOCAL_HEADER 0x00000008 ///< Place global headers at every keyframe instead of in extradata.
393 #define CODEC_FLAG2_BPYRAMID 0x00000010 ///< H.264 allow B-frames to be used as references.
394 #define CODEC_FLAG2_WPRED 0x00000020 ///< H.264 weighted biprediction for B-frames
395 #define CODEC_FLAG2_MIXED_REFS 0x00000040 ///< H.264 one reference per partition, as opposed to one reference per macroblock
396 #define CODEC_FLAG2_8X8DCT 0x00000080 ///< H.264 high profile 8x8 transform
397 #define CODEC_FLAG2_FASTPSKIP 0x00000100 ///< H.264 fast pskip
398 #define CODEC_FLAG2_AUD 0x00000200 ///< H.264 access unit delimiters
399 #define CODEC_FLAG2_BRDO 0x00000400 ///< B-frame rate-distortion optimization
400 #define CODEC_FLAG2_INTRA_VLC 0x00000800 ///< Use MPEG-2 intra VLC table.
401 #define CODEC_FLAG2_MEMC_ONLY 0x00001000 ///< Only do ME/MC (I frames -> ref, P frame -> ME+MC).
402 #define CODEC_FLAG2_DROP_FRAME_TIMECODE 0x00002000 ///< timecode is in drop frame format.
403 #define CODEC_FLAG2_SKIP_RD 0x00004000 ///< RD optimal MB level residual skipping
404 #define CODEC_FLAG2_CHUNKS 0x00008000 ///< Input bitstream might be truncated at a packet boundaries instead of only at frame boundaries.
405 #define CODEC_FLAG2_NON_LINEAR_QUANT 0x00010000 ///< Use MPEG-2 nonlinear quantizer.
406
407 /* Unsupported options :
408 * Syntax Arithmetic coding (SAC)
409 * Reference Picture Selection
410 * Independent Segment Decoding */
411 /* /Fx */
412 /* codec capabilities */
413
414 #define CODEC_CAP_DRAW_HORIZ_BAND 0x0001 ///< Decoder can use draw_horiz_band callback.
415 /**
416 * Codec uses get_buffer() for allocating buffers.
417 * direct rendering method 1
418 */
419 #define CODEC_CAP_DR1 0x0002
420 /* If 'parse_only' field is true, then avcodec_parse_frame() can be used. */
421 #define CODEC_CAP_PARSE_ONLY 0x0004
422 #define CODEC_CAP_TRUNCATED 0x0008
423 /* Codec can export data for HW decoding (XvMC). */
424 #define CODEC_CAP_HWACCEL 0x0010
425 /**
426 * Codec has a nonzero delay and needs to be fed with NULL at the end to get the delayed data.
427 * If this is not set, the codec is guaranteed to never be fed with NULL data.
428 */
429 #define CODEC_CAP_DELAY 0x0020
430 /**
431 * Codec can be fed a final frame with a smaller size.
432 * This can be used to prevent truncation of the last audio samples.
433 */
434 #define CODEC_CAP_SMALL_LAST_FRAME 0x0040
435
436 //The following defines may change, don't expect compatibility if you use them.
437 #define MB_TYPE_INTRA4x4 0x0001
438 #define MB_TYPE_INTRA16x16 0x0002 //FIXME H.264-specific
439 #define MB_TYPE_INTRA_PCM 0x0004 //FIXME H.264-specific
440 #define MB_TYPE_16x16 0x0008
441 #define MB_TYPE_16x8 0x0010
442 #define MB_TYPE_8x16 0x0020
443 #define MB_TYPE_8x8 0x0040
444 #define MB_TYPE_INTERLACED 0x0080
445 #define MB_TYPE_DIRECT2 0x0100 //FIXME
446 #define MB_TYPE_ACPRED 0x0200
447 #define MB_TYPE_GMC 0x0400
448 #define MB_TYPE_SKIP 0x0800
449 #define MB_TYPE_P0L0 0x1000
450 #define MB_TYPE_P1L0 0x2000
451 #define MB_TYPE_P0L1 0x4000
452 #define MB_TYPE_P1L1 0x8000
453 #define MB_TYPE_L0 (MB_TYPE_P0L0 | MB_TYPE_P1L0)
454 #define MB_TYPE_L1 (MB_TYPE_P0L1 | MB_TYPE_P1L1)
455 #define MB_TYPE_L0L1 (MB_TYPE_L0 | MB_TYPE_L1)
456 #define MB_TYPE_QUANT 0x00010000
457 #define MB_TYPE_CBP 0x00020000
458 //Note bits 24-31 are reserved for codec specific use (h264 ref0, mpeg1 0mv, ...)
459
460 /**
461 * Pan Scan area.
462 * This specifies the area which should be displayed.
463 * Note there may be multiple such areas for one frame.
464 */
465 typedef struct AVPanScan{
466 /**
467 * id
468 * - encoding: Set by user.
469 * - decoding: Set by libavcodec.
470 */
471 int id;
472
473 /**
474 * width and height in 1/16 pel
475 * - encoding: Set by user.
476 * - decoding: Set by libavcodec.
477 */
478 int width;
479 int height;
480
481 /**
482 * position of the top left corner in 1/16 pel for up to 3 fields/frames
483 * - encoding: Set by user.
484 * - decoding: Set by libavcodec.
485 */
486 int16_t position[3][2];
487 }AVPanScan;
488
489 #define FF_COMMON_FRAME \
490 /**\
491 * pointer to the picture planes.\
492 * This might be different from the first allocated byte\
493 * - encoding: \
494 * - decoding: \
495 */\
496 uint8_t *data[4];\
497 int linesize[4];\
498 /**\
499 * pointer to the first allocated byte of the picture. Can be used in get_buffer/release_buffer.\
500 * This isn't used by libavcodec unless the default get/release_buffer() is used.\
501 * - encoding: \
502 * - decoding: \
503 */\
504 uint8_t *base[4];\
505 /**\
506 * 1 -> keyframe, 0-> not\
507 * - encoding: Set by libavcodec.\
508 * - decoding: Set by libavcodec.\
509 */\
510 int key_frame;\
511 \
512 /**\
513 * Picture type of the frame, see ?_TYPE below.\
514 * - encoding: Set by libavcodec. for coded_picture (and set by user for input).\
515 * - decoding: Set by libavcodec.\
516 */\
517 int pict_type;\
518 \
519 /**\
520 * presentation timestamp in time_base units (time when frame should be shown to user)\
521 * If AV_NOPTS_VALUE then frame_rate = 1/time_base will be assumed.\
522 * - encoding: MUST be set by user.\
523 * - decoding: Set by libavcodec.\
524 */\
525 int64_t pts;\
526 \
527 /**\
528 * picture number in bitstream order\
529 * - encoding: set by\
530 * - decoding: Set by libavcodec.\
531 */\
532 int coded_picture_number;\
533 /**\
534 * picture number in display order\
535 * - encoding: set by\
536 * - decoding: Set by libavcodec.\
537 */\
538 int display_picture_number;\
539 \
540 /**\
541 * quality (between 1 (good) and FF_LAMBDA_MAX (bad)) \
542 * - encoding: Set by libavcodec. for coded_picture (and set by user for input).\
543 * - decoding: Set by libavcodec.\
544 */\
545 int quality; \
546 \
547 /**\
548 * buffer age (1->was last buffer and dint change, 2->..., ...).\
549 * Set to INT_MAX if the buffer has not been used yet.\
550 * - encoding: unused\
551 * - decoding: MUST be set by get_buffer().\
552 */\
553 int age;\
554 \
555 /**\
556 * is this picture used as reference\
557 * - encoding: unused\
558 * - decoding: Set by libavcodec. (before get_buffer() call)).\
559 */\
560 int reference;\
561 \
562 /**\
563 * QP table\
564 * - encoding: unused\
565 * - decoding: Set by libavcodec.\
566 */\
567 int8_t *qscale_table;\
568 /**\
569 * QP store stride\
570 * - encoding: unused\
571 * - decoding: Set by libavcodec.\
572 */\
573 int qstride;\
574 \
575 /**\
576 * mbskip_table[mb]>=1 if MB didn't change\
577 * stride= mb_width = (width+15)>>4\
578 * - encoding: unused\
579 * - decoding: Set by libavcodec.\
580 */\
581 uint8_t *mbskip_table;\
582 \
583 /**\
584 * motion vector table\
585 * @code\
586 * example:\
587 * int mv_sample_log2= 4 - motion_subsample_log2;\
588 * int mb_width= (width+15)>>4;\
589 * int mv_stride= (mb_width << mv_sample_log2) + 1;\
590 * motion_val[direction][x + y*mv_stride][0->mv_x, 1->mv_y];\
591 * @endcode\
592 * - encoding: Set by user.\
593 * - decoding: Set by libavcodec.\
594 */\
595 int16_t (*motion_val[2])[2];\
596 \
597 /**\
598 * macroblock type table\
599 * mb_type_base + mb_width + 2\
600 * - encoding: Set by user.\
601 * - decoding: Set by libavcodec.\
602 */\
603 uint32_t *mb_type;\
604 \
605 /**\
606 * log2 of the size of the block which a single vector in motion_val represents: \
607 * (4->16x16, 3->8x8, 2-> 4x4, 1-> 2x2)\
608 * - encoding: unused\
609 * - decoding: Set by libavcodec.\
610 */\
611 uint8_t motion_subsample_log2;\
612 \
613 /**\
614 * for some private data of the user\
615 * - encoding: unused\
616 * - decoding: Set by user.\
617 */\
618 void *opaque;\
619 \
620 /**\
621 * error\
622 * - encoding: Set by libavcodec. if flags&CODEC_FLAG_PSNR.\
623 * - decoding: unused\
624 */\
625 uint64_t error[4];\
626 \
627 /**\
628 * type of the buffer (to keep track of who has to deallocate data[*])\
629 * - encoding: Set by the one who allocates it.\
630 * - decoding: Set by the one who allocates it.\
631 * Note: User allocated (direct rendering) & internal buffers cannot coexist currently.\
632 */\
633 int type;\
634 \
635 /**\
636 * When decoding, this signals how much the picture must be delayed.\
637 * extra_delay = repeat_pict / (2*fps)\
638 * - encoding: unused\
639 * - decoding: Set by libavcodec.\
640 */\
641 int repeat_pict;\
642 \
643 /**\
644 * \
645 */\
646 int qscale_type;\
647 \
648 /**\
649 * The content of the picture is interlaced.\
650 * - encoding: Set by user.\
651 * - decoding: Set by libavcodec. (default 0)\
652 */\
653 int interlaced_frame;\
654 \
655 /**\
656 * If the content is interlaced, is top field displayed first.\
657 * - encoding: Set by user.\
658 * - decoding: Set by libavcodec.\
659 */\
660 int top_field_first;\
661 \
662 /**\
663 * Pan scan.\
664 * - encoding: Set by user.\
665 * - decoding: Set by libavcodec.\
666 */\
667 AVPanScan *pan_scan;\
668 \
669 /**\
670 * Tell user application that palette has changed from previous frame.\
671 * - encoding: ??? (no palette-enabled encoder yet)\
672 * - decoding: Set by libavcodec. (default 0).\
673 */\
674 int palette_has_changed;\
675 \
676 /**\
677 * codec suggestion on buffer type if != 0\
678 * - encoding: unused\
679 * - decoding: Set by libavcodec. (before get_buffer() call)).\
680 */\
681 int buffer_hints;\
682 \
683 /**\
684 * DCT coefficients\
685 * - encoding: unused\
686 * - decoding: Set by libavcodec.\
687 */\
688 short *dct_coeff;\
689 \
690 /**\
691 * motion referece frame index\
692 * - encoding: Set by user.\
693 * - decoding: Set by libavcodec.\
694 */\
695 int8_t *ref_index[2];
696
697 #define FF_QSCALE_TYPE_MPEG1 0
698 #define FF_QSCALE_TYPE_MPEG2 1
699 #define FF_QSCALE_TYPE_H264 2
700
701 #define FF_BUFFER_TYPE_INTERNAL 1
702 #define FF_BUFFER_TYPE_USER 2 ///< direct rendering buffers (image is (de)allocated by user)
703 #define FF_BUFFER_TYPE_SHARED 4 ///< Buffer from somewhere else; don't deallocate image (data/base), all other tables are not shared.
704 #define FF_BUFFER_TYPE_COPY 8 ///< Just a (modified) copy of some other buffer, don't deallocate anything.
705
706
707 #define FF_I_TYPE 1 // Intra
708 #define FF_P_TYPE 2 // Predicted
709 #define FF_B_TYPE 3 // Bi-dir predicted
710 #define FF_S_TYPE 4 // S(GMC)-VOP MPEG4
711 #define FF_SI_TYPE 5
712 #define FF_SP_TYPE 6
713
714 #define FF_BUFFER_HINTS_VALID 0x01 // Buffer hints value is meaningful (if 0 ignore).
715 #define FF_BUFFER_HINTS_READABLE 0x02 // Codec will read from buffer.
716 #define FF_BUFFER_HINTS_PRESERVE 0x04 // User must not alter buffer content.
717 #define FF_BUFFER_HINTS_REUSABLE 0x08 // Codec will reuse the buffer (update).
718
719 /**
720 * Audio Video Frame.
721 */
722 typedef struct AVFrame {
723 FF_COMMON_FRAME
724 } AVFrame;
725
726 #define DEFAULT_FRAME_RATE_BASE 1001000
727
728 /**
729 * main external API structure
730 */
731 typedef struct AVCodecContext {
732 /**
733 * information on struct for av_log
734 * - set by avcodec_alloc_context
735 */
736 AVClass *av_class;
737 /**
738 * the average bitrate
739 * - encoding: Set by user; unused for constant quantizer encoding.
740 * - decoding: Set by libavcodec. 0 or some bitrate if this info is available in the stream.
741 */
742 int bit_rate;
743
744 /**
745 * number of bits the bitstream is allowed to diverge from the reference.
746 * the reference can be CBR (for CBR pass1) or VBR (for pass2)
747 * - encoding: Set by user; unused for constant quantizer encoding.
748 * - decoding: unused
749 */
750 int bit_rate_tolerance;
751
752 /**
753 * CODEC_FLAG_*.
754 * - encoding: Set by user.
755 * - decoding: Set by user.
756 */
757 int flags;
758
759 /**
760 * Some codecs need additional format info. It is stored here.
761 * If any muxer uses this then ALL demuxers/parsers AND encoders for the
762 * specific codec MUST set it correctly otherwise stream copy breaks.
763 * In general use of this field by muxers is not recommanded.
764 * - encoding: Set by libavcodec.
765 * - decoding: Set by libavcodec. (FIXME: Is this OK?)
766 */
767 int sub_id;
768
769 /**
770 * Motion estimation algorithm used for video coding.
771 * 1 (zero), 2 (full), 3 (log), 4 (phods), 5 (epzs), 6 (x1), 7 (hex),
772 * 8 (umh), 9 (iter) [7, 8 are x264 specific, 9 is snow specific]
773 * - encoding: MUST be set by user.
774 * - decoding: unused
775 */
776 int me_method;
777
778 /**
779 * some codecs need / can use extradata like Huffman tables.
780 * mjpeg: Huffman tables
781 * rv10: additional flags
782 * mpeg4: global headers (they can be in the bitstream or here)
783 * The allocated memory should be FF_INPUT_BUFFER_PADDING_SIZE bytes larger
784 * than extradata_size to avoid prolems if it is read with the bitstream reader.
785 * The bytewise contents of extradata must not depend on the architecture or CPU endianness.
786 * - encoding: Set/allocated/freed by libavcodec.
787 * - decoding: Set/allocated/freed by user.
788 */
789 uint8_t *extradata;
790 int extradata_size;
791
792 /**
793 * This is the fundamental unit of time (in seconds) in terms
794 * of which frame timestamps are represented. For fixed-fps content,
795 * timebase should be 1/framerate and timestamp increments should be
796 * identically 1.
797 * - encoding: MUST be set by user.
798 * - decoding: Set by libavcodec.
799 */
800 AVRational time_base;
801
802 /* video only */
803 /**
804 * picture width / height.
805 * - encoding: MUST be set by user.
806 * - decoding: Set by libavcodec.
807 * Note: For compatibility it is possible to set this instead of
808 * coded_width/height before decoding.
809 */
810 int width, height;
811
812 #define FF_ASPECT_EXTENDED 15
813
814 /**
815 * the number of pictures in a group of pictures, or 0 for intra_only
816 * - encoding: Set by user.
817 * - decoding: unused
818 */
819 int gop_size;
820
821 /**
822 * Pixel format, see PIX_FMT_xxx.
823 * - encoding: Set by user.
824 * - decoding: Set by libavcodec.
825 */
826 enum PixelFormat pix_fmt;
827
828 /**
829 * Frame rate emulation. If not zero, the lower layer (i.e. format handler)
830 * has to read frames at native frame rate.
831 * - encoding: Set by user.
832 * - decoding: unused
833 */
834 int rate_emu;
835
836 /**
837 * If non NULL, 'draw_horiz_band' is called by the libavcodec
838 * decoder to draw a horizontal band. It improves cache usage. Not
839 * all codecs can do that. You must check the codec capabilities
840 * beforehand.
841 * - encoding: unused
842 * - decoding: Set by user.
843 * @param height the height of the slice
844 * @param y the y position of the slice
845 * @param type 1->top field, 2->bottom field, 3->frame
846 * @param offset offset into the AVFrame.data from which the slice should be read
847 */
848 void (*draw_horiz_band)(struct AVCodecContext *s,
849 const AVFrame *src, int offset[4],
850 int y, int type, int height);
851
852 /* audio only */
853 int sample_rate; ///< samples per second
854 int channels;
855
856 /**
857 * audio sample format
858 * - encoding: Set by user.
859 * - decoding: Set by libavcodec.
860 */
861 enum SampleFormat sample_fmt; ///< sample format, currently unused
862
863 /* The following data should not be initialized. */
864 /**
865 * Samples per packet, initialized when calling 'init'.
866 */
867 int frame_size;
868 int frame_number; ///< audio or video frame number
869 int real_pict_num; ///< Returns the real picture number of previous encoded frame.
870
871 /**
872 * Number of frames the decoded output will be delayed relative to
873 * the encoded input.
874 * - encoding: Set by libavcodec.
875 * - decoding: unused
876 */
877 int delay;
878
879 /* - encoding parameters */
880 float qcompress; ///< amount of qscale change between easy & hard scenes (0.0-1.0)
881 float qblur; ///< amount of qscale smoothing over time (0.0-1.0)
882
883 /**
884 * minimum quantizer
885 * - encoding: Set by user.
886 * - decoding: unused
887 */
888 int qmin;
889
890 /**
891 * maximum quantizer
892 * - encoding: Set by user.
893 * - decoding: unused
894 */
895 int qmax;
896
897 /**
898 * maximum quantizer difference between frames
899 * - encoding: Set by user.
900 * - decoding: unused
901 */
902 int max_qdiff;
903
904 /**
905 * maximum number of B-frames between non-B-frames
906 * Note: The output will be delayed by max_b_frames+1 relative to the input.
907 * - encoding: Set by user.
908 * - decoding: unused
909 */
910 int max_b_frames;
911
912 /**
913 * qscale factor between IP and B-frames
914 * - encoding: Set by user.
915 * - decoding: unused
916 */
917 float b_quant_factor;
918
919 /** obsolete FIXME remove */
920 int rc_strategy;
921 #define FF_RC_STRATEGY_XVID 1
922
923 int b_frame_strategy;
924
925 /**
926 * hurry up amount
927 * - encoding: unused
928 * - decoding: Set by user. 1-> Skip B-frames, 2-> Skip IDCT/dequant too, 5-> Skip everything except header
929 * @deprecated Deprecated in favor of skip_idct and skip_frame.
930 */
931 int hurry_up;
932
933 struct AVCodec *codec;
934
935 void *priv_data;
936
937 #if LIBAVCODEC_VERSION_INT < ((52<<16)+(0<<8)+0)
938 /* unused, FIXME remove*/
939 int rtp_mode;
940 #endif
941
942 int rtp_payload_size; /* The size of the RTP payload: the coder will */
943 /* do its best to deliver a chunk with size */
944 /* below rtp_payload_size, the chunk will start */
945 /* with a start code on some codecs like H.263. */
946 /* This doesn't take account of any particular */
947 /* headers inside the transmitted RTP payload. */
948
949
950 /* The RTP callback: This function is called */
951 /* every time the encoder has a packet to send. */
952 /* It depends on the encoder if the data starts */
953 /* with a Start Code (it should). H.263 does. */
954 /* mb_nb contains the number of macroblocks */
955 /* encoded in the RTP payload. */
956 void (*rtp_callback)(struct AVCodecContext *avctx, void *data, int size, int mb_nb);
957
958 /* statistics, used for 2-pass encoding */
959 int mv_bits;
960 int header_bits;
961 int i_tex_bits;
962 int p_tex_bits;
963 int i_count;
964 int p_count;
965 int skip_count;
966 int misc_bits;
967
968 /**
969 * number of bits used for the previously encoded frame
970 * - encoding: Set by libavcodec.
971 * - decoding: unused
972 */
973 int frame_bits;
974
975 /**
976 * Private data of the user, can be used to carry app specific stuff.
977 * - encoding: Set by user.
978 * - decoding: Set by user.
979 */
980 void *opaque;
981
982 char codec_name[32];
983 enum CodecType codec_type; /* see CODEC_TYPE_xxx */
984 enum CodecID codec_id; /* see CODEC_ID_xxx */
985
986 /**
987 * fourcc (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A').
988 * This is used to work around some encoder bugs.
989 * A demuxer should set this to what is stored in the field used to identify the codec.
990 * If there are multiple such fields in a container then the demuxer should choose the one
991 * which maximizes the information about the used codec.
992 * If the codec tag field in a container is larger then 32 bits then the demuxer should
993 * remap the longer ID to 32 bits with a table or other structure. Alternatively a new
994 * extra_codec_tag + size could be added but for this a clear advantage must be demonstrated
995 * first.
996 * - encoding: Set by user, if not then the default based on codec_id will be used.
997 * - decoding: Set by user, will be converted to uppercase by libavcodec during init.
998 */
999 unsigned int codec_tag;
1000
1001 /**
1002 * Work around bugs in encoders which sometimes cannot be detected automatically.
1003 * - encoding: Set by user
1004 * - decoding: Set by user
1005 */
1006 int workaround_bugs;
1007 #define FF_BUG_AUTODETECT 1 ///< autodetection
1008 #define FF_BUG_OLD_MSMPEG4 2
1009 #define FF_BUG_XVID_ILACE 4
1010 #define FF_BUG_UMP4 8
1011 #define FF_BUG_NO_PADDING 16
1012 #define FF_BUG_AMV 32
1013 #define FF_BUG_AC_VLC 0 ///< Will be removed, libavcodec can now handle these non-compliant files by default.
1014 #define FF_BUG_QPEL_CHROMA 64
1015 #define FF_BUG_STD_QPEL 128
1016 #define FF_BUG_QPEL_CHROMA2 256
1017 #define FF_BUG_DIRECT_BLOCKSIZE 512
1018 #define FF_BUG_EDGE 1024
1019 #define FF_BUG_HPEL_CHROMA 2048
1020 #define FF_BUG_DC_CLIP 4096
1021 #define FF_BUG_MS 8192 ///< Work around various bugs in Microsoft's broken decoders.
1022 //#define FF_BUG_FAKE_SCALABILITY 16 //Autodetection should work 100%.
1023
1024 /**
1025 * luma single coefficient elimination threshold
1026 * - encoding: Set by user.
1027 * - decoding: unused
1028 */
1029 int luma_elim_threshold;
1030
1031 /**
1032 * chroma single coeff elimination threshold
1033 * - encoding: Set by user.
1034 * - decoding: unused
1035 */
1036 int chroma_elim_threshold;
1037
1038 /**
1039 * strictly follow the standard (MPEG4, ...).
1040 * - encoding: Set by user.
1041 * - decoding: unused
1042 */
1043 int strict_std_compliance;
1044 #define FF_COMPLIANCE_VERY_STRICT 2 ///< Strictly conform to a older more strict version of the spec or reference software.
1045 #define FF_COMPLIANCE_STRICT 1 ///< Strictly conform to all the things in the spec no matter what consequences.
1046 #define FF_COMPLIANCE_NORMAL 0
1047 #define FF_COMPLIANCE_INOFFICIAL -1 ///< Allow inofficial extensions.
1048 #define FF_COMPLIANCE_EXPERIMENTAL -2 ///< Allow nonstandardized experimental things.
1049
1050 /**
1051 * qscale offset between IP and B-frames
1052 * If > 0 then the last P-frame quantizer will be used (q= lastp_q*factor+offset).
1053 * If < 0 then normal ratecontrol will be done (q= -normal_q*factor+offset).
1054 * - encoding: Set by user.
1055 * - decoding: unused
1056 */
1057 float b_quant_offset;
1058
1059 /**
1060 * Error resilience; higher values will detect more errors but may
1061 * misdetect some more or less valid parts as errors.
1062 * - encoding: unused
1063 * - decoding: Set by user.
1064 */
1065 int error_resilience;
1066 #define FF_ER_CAREFUL 1
1067 #define FF_ER_COMPLIANT 2
1068 #define FF_ER_AGGRESSIVE 3
1069 #define FF_ER_VERY_AGGRESSIVE 4
1070
1071 /**
1072 * Called at the beginning of each frame to get a buffer for it.
1073 * If pic.reference is set then the frame will be read later by libavcodec.
1074 * avcodec_align_dimensions() should be used to find the required width and
1075 * height, as they normally need to be rounded up to the next multiple of 16.
1076 * - encoding: unused
1077 * - decoding: Set by libavcodec., user can override.
1078 */
1079 int (*get_buffer)(struct AVCodecContext *c, AVFrame *pic);
1080
1081 /**
1082 * Called to release buffers which where allocated with get_buffer.
1083 * A released buffer can be reused in get_buffer().
1084 * pic.data[*] must be set to NULL.
1085 * - encoding: unused
1086 * - decoding: Set by libavcodec., user can override.
1087 */
1088 void (*release_buffer)(struct AVCodecContext *c, AVFrame *pic);
1089
1090 /**
1091 * If 1 the stream has a 1 frame delay during decoding.
1092 * - encoding: Set by libavcodec.
1093 * - decoding: Set by libavcodec.
1094 */
1095 int has_b_frames;
1096
1097 /**
1098 * number of bytes per packet if constant and known or 0
1099 * Used by some WAV based audio codecs.
1100 */
1101 int block_align;
1102
1103 int parse_only; /* - decoding only: If true, only parsing is done
1104 (function avcodec_parse_frame()). The frame
1105 data is returned. Only MPEG codecs support this now. */
1106
1107 /**
1108 * 0-> h263 quant 1-> mpeg quant
1109 * - encoding: Set by user.
1110 * - decoding: unused
1111 */
1112 int mpeg_quant;
1113
1114 /**
1115 * pass1 encoding statistics output buffer
1116 * - encoding: Set by libavcodec.
1117 * - decoding: unused
1118 */
1119 char *stats_out;
1120
1121 /**
1122 * pass2 encoding statistics input buffer
1123 * Concatenated stuff from stats_out of pass1 should be placed here.
1124 * - encoding: Allocated/set/freed by user.
1125 * - decoding: unused
1126 */
1127 char *stats_in;
1128
1129 /**
1130 * ratecontrol qmin qmax limiting method
1131 * 0-> clipping, 1-> use a nice continous function to limit qscale wthin qmin/qmax.
1132 * - encoding: Set by user.
1133 * - decoding: unused
1134 */
1135 float rc_qsquish;
1136
1137 float rc_qmod_amp;
1138 int rc_qmod_freq;
1139
1140 /**
1141 * ratecontrol override, see RcOverride
1142 * - encoding: Allocated/set/freed by user.
1143 * - decoding: unused
1144 */
1145 RcOverride *rc_override;
1146 int rc_override_count;
1147
1148 /**
1149 * rate control equation
1150 * - encoding: Set by user
1151 * - decoding: unused
1152 */
1153 char *rc_eq;
1154
1155 /**
1156 * maximum bitrate
1157 * - encoding: Set by user.
1158 * - decoding: unused
1159 */
1160 int rc_max_rate;
1161
1162 /**
1163 * minimum bitrate
1164 * - encoding: Set by user.
1165 * - decoding: unused
1166 */
1167 int rc_min_rate;
1168
1169 /**
1170 * decoder bitstream buffer size
1171 * - encoding: Set by user.
1172 * - decoding: unused
1173 */
1174 int rc_buffer_size;
1175 float rc_buffer_aggressivity;
1176
1177 /**
1178 * qscale factor between P and I-frames
1179 * If > 0 then the last p frame quantizer will be used (q= lastp_q*factor+offset).
1180 * If < 0 then normal ratecontrol will be done (q= -normal_q*factor+offset).
1181 * - encoding: Set by user.
1182 * - decoding: unused
1183 */
1184 float i_quant_factor;
1185
1186 /**
1187 * qscale offset between P and I-frames
1188 * - encoding: Set by user.
1189 * - decoding: unused
1190 */
1191 float i_quant_offset;
1192
1193 /**
1194 * initial complexity for pass1 ratecontrol
1195 * - encoding: Set by user.
1196 * - decoding: unused
1197 */
1198 float rc_initial_cplx;
1199
1200 /**
1201 * DCT algorithm, see FF_DCT_* below
1202 * - encoding: Set by user.
1203 * - decoding: unused
1204 */
1205 int dct_algo;
1206 #define FF_DCT_AUTO 0
1207 #define FF_DCT_FASTINT 1
1208 #define FF_DCT_INT 2
1209 #define FF_DCT_MMX 3
1210 #define FF_DCT_MLIB 4
1211 #define FF_DCT_ALTIVEC 5
1212 #define FF_DCT_FAAN 6
1213
1214 /**
1215 * luminance masking (0-> disabled)
1216 * - encoding: Set by user.
1217 * - decoding: unused
1218 */
1219 float lumi_masking;
1220
1221 /**
1222 * temporary complexity masking (0-> disabled)
1223 * - encoding: Set by user.
1224 * - decoding: unused
1225 */
1226 float temporal_cplx_masking;
1227
1228 /**
1229 * spatial complexity masking (0-> disabled)
1230 * - encoding: Set by user.
1231 * - decoding: unused
1232 */
1233 float spatial_cplx_masking;
1234
1235 /**
1236 * p block masking (0-> disabled)
1237 * - encoding: Set by user.
1238 * - decoding: unused
1239 */
1240 float p_masking;
1241
1242 /**
1243 * darkness masking (0-> disabled)
1244 * - encoding: Set by user.
1245 * - decoding: unused
1246 */
1247 float dark_masking;
1248
1249
1250 /* for binary compatibility */
1251 int unused;
1252
1253 /**
1254 * IDCT algorithm, see FF_IDCT_* below.
1255 * - encoding: Set by user.
1256 * - decoding: Set by user.
1257 */
1258 int idct_algo;
1259 #define FF_IDCT_AUTO 0
1260 #define FF_IDCT_INT 1
1261 #define FF_IDCT_SIMPLE 2
1262 #define FF_IDCT_SIMPLEMMX 3
1263 #define FF_IDCT_LIBMPEG2MMX 4
1264 #define FF_IDCT_PS2 5
1265 #define FF_IDCT_MLIB 6
1266 #define FF_IDCT_ARM 7
1267 #define FF_IDCT_ALTIVEC 8
1268 #define FF_IDCT_SH4 9
1269 #define FF_IDCT_SIMPLEARM 10
1270 #define FF_IDCT_H264 11
1271 #define FF_IDCT_VP3 12
1272 #define FF_IDCT_IPP 13
1273 #define FF_IDCT_XVIDMMX 14
1274 #define FF_IDCT_CAVS 15
1275 #define FF_IDCT_SIMPLEARMV5TE 16
1276 #define FF_IDCT_SIMPLEARMV6 17
1277
1278 /**
1279 * slice count
1280 * - encoding: Set by libavcodec.
1281 * - decoding: Set by user (or 0).
1282 */
1283 int slice_count;
1284 /**
1285 * slice offsets in the frame in bytes
1286 * - encoding: Set/allocated by libavcodec.
1287 * - decoding: Set/allocated by user (or NULL).
1288 */
1289 int *slice_offset;
1290
1291 /**
1292 * error concealment flags
1293 * - encoding: unused
1294 * - decoding: Set by user.
1295 */
1296 int error_concealment;
1297 #define FF_EC_GUESS_MVS 1
1298 #define FF_EC_DEBLOCK 2
1299
1300 /**
1301 * dsp_mask could be add used to disable unwanted CPU features
1302 * CPU features (i.e. MMX, SSE. ...)
1303 *
1304 * With the FORCE flag you may instead enable given CPU features.
1305 * (Dangerous: Usable in case of misdetection, improper usage however will
1306 * result into program crash.)
1307 */
1308 unsigned dsp_mask;
1309 #define FF_MM_FORCE 0x80000000 /* Force usage of selected flags (OR) */
1310 /* lower 16 bits - CPU features */
1311 #ifdef HAVE_MMX
1312 #define FF_MM_MMX 0x0001 /* standard MMX */
1313 #define FF_MM_3DNOW 0x0004 /* AMD 3DNOW */
1314 #define FF_MM_MMXEXT 0x0002 /* SSE integer functions or AMD MMX ext */
1315 #define FF_MM_SSE 0x0008 /* SSE functions */
1316 #define FF_MM_SSE2 0x0010 /* PIV SSE2 functions */
1317 #define FF_MM_3DNOWEXT 0x0020 /* AMD 3DNowExt */
1318 #endif /* HAVE_MMX */
1319 #ifdef HAVE_IWMMXT
1320 #define FF_MM_IWMMXT 0x0100 /* XScale IWMMXT */
1321 #endif /* HAVE_IWMMXT */
1322
1323 /**
1324 * bits per sample/pixel from the demuxer (needed for huffyuv).
1325 * - encoding: Set by libavcodec.
1326 * - decoding: Set by user.
1327 */
1328 int bits_per_sample;
1329
1330 /**
1331 * prediction method (needed for huffyuv)
1332 * - encoding: Set by user.
1333 * - decoding: unused
1334 */
1335 int prediction_method;
1336 #define FF_PRED_LEFT 0
1337 #define FF_PRED_PLANE 1
1338 #define FF_PRED_MEDIAN 2
1339
1340 /**
1341 * sample aspect ratio (0 if unknown)
1342 * Numerator and denominator must be relatively prime and smaller than 256 for some video standards.
1343 * - encoding: Set by user.
1344 * - decoding: Set by libavcodec.
1345 */
1346 AVRational sample_aspect_ratio;
1347
1348 /**
1349 * the picture in the bitstream
1350 * - encoding: Set by libavcodec.
1351 * - decoding: Set by libavcodec.
1352 */
1353 AVFrame *coded_frame;
1354
1355 /**
1356 * debug
1357 * - encoding: Set by user.
1358 * - decoding: Set by user.
1359 */
1360 int debug;
1361 #define FF_DEBUG_PICT_INFO 1
1362 #define FF_DEBUG_RC 2
1363 #define FF_DEBUG_BITSTREAM 4
1364 #define FF_DEBUG_MB_TYPE 8
1365 #define FF_DEBUG_QP 16
1366 #define FF_DEBUG_MV 32
1367 #define FF_DEBUG_DCT_COEFF 0x00000040
1368 #define FF_DEBUG_SKIP 0x00000080
1369 #define FF_DEBUG_STARTCODE 0x00000100
1370 #define FF_DEBUG_PTS 0x00000200
1371 #define FF_DEBUG_ER 0x00000400
1372 #define FF_DEBUG_MMCO 0x00000800
1373 #define FF_DEBUG_BUGS 0x00001000
1374 #define FF_DEBUG_VIS_QP 0x00002000
1375 #define FF_DEBUG_VIS_MB_TYPE 0x00004000
1376
1377 /**
1378 * debug
1379 * - encoding: Set by user.
1380 * - decoding: Set by user.
1381 */
1382 int debug_mv;
1383 #define FF_DEBUG_VIS_MV_P_FOR 0x00000001 //visualize forward predicted MVs of P frames
1384 #define FF_DEBUG_VIS_MV_B_FOR 0x00000002 //visualize forward predicted MVs of B frames
1385 #define FF_DEBUG_VIS_MV_B_BACK 0x00000004 //visualize backward predicted MVs of B frames
1386
1387 /**
1388 * error
1389 * - encoding: Set by libavcodec if flags&CODEC_FLAG_PSNR.
1390 * - decoding: unused
1391 */
1392 uint64_t error[4];
1393
1394 /**
1395 * minimum MB quantizer
1396 * - encoding: unused
1397 * - decoding: unused
1398 */
1399 int mb_qmin;
1400
1401 /**
1402 * maximum MB quantizer
1403 * - encoding: unused
1404 * - decoding: unused
1405 */
1406 int mb_qmax;
1407
1408 /**
1409 * motion estimation comparison function
1410 * - encoding: Set by user.
1411 * - decoding: unused
1412 */
1413 int me_cmp;
1414 /**
1415 * subpixel motion estimation comparison function
1416 * - encoding: Set by user.
1417 * - decoding: unused
1418 */
1419 int me_sub_cmp;
1420 /**
1421 * macroblock comparison function (not supported yet)
1422 * - encoding: Set by user.
1423 * - decoding: unused
1424 */
1425 int mb_cmp;
1426 /**
1427 * interlaced DCT comparison function
1428 * - encoding: Set by user.
1429 * - decoding: unused
1430 */
1431 int ildct_cmp;
1432 #define FF_CMP_SAD 0
1433 #define FF_CMP_SSE 1
1434 #define FF_CMP_SATD 2
1435 #define FF_CMP_DCT 3
1436 #define FF_CMP_PSNR 4
1437 #define FF_CMP_BIT 5
1438 #define FF_CMP_RD 6
1439 #define FF_CMP_ZERO 7
1440 #define FF_CMP_VSAD 8
1441 #define FF_CMP_VSSE 9
1442 #define FF_CMP_NSSE 10
1443 #define FF_CMP_W53 11
1444 #define FF_CMP_W97 12
1445 #define FF_CMP_DCTMAX 13
1446 #define FF_CMP_DCT264 14
1447 #define FF_CMP_CHROMA 256
1448
1449 /**
1450 * ME diamond size & shape
1451 * - encoding: Set by user.
1452 * - decoding: unused
1453 */
1454 int dia_size;
1455
1456 /**
1457 * amount of previous MV predictors (2a+1 x 2a+1 square)
1458 * - encoding: Set by user.
1459 * - decoding: unused
1460 */
1461 int last_predictor_count;
1462
1463 /**
1464 * prepass for motion estimation
1465 * - encoding: Set by user.
1466 * - decoding: unused
1467 */
1468 int pre_me;
1469
1470 /**
1471 * motion estimation prepass comparison function
1472 * - encoding: Set by user.
1473 * - decoding: unused
1474 */
1475 int me_pre_cmp;
1476
1477 /**
1478 * ME prepass diamond size & shape
1479 * - encoding: Set by user.
1480 * - decoding: unused
1481 */
1482 int pre_dia_size;
1483
1484 /**
1485 * subpel ME quality
1486 * - encoding: Set by user.
1487 * - decoding: unused
1488 */
1489 int me_subpel_quality;
1490
1491 /**
1492 * callback to negotiate the pixelFormat
1493 * @param fmt is the list of formats which are supported by the codec,
1494 * it is terminated by -1 as 0 is a valid format, the formats are ordered by quality.
1495 * The first is always the native one.
1496 * @return the chosen format
1497 * - encoding: unused
1498 * - decoding: Set by user, if not set the native format will be chosen.
1499 */
1500 enum PixelFormat (*get_format)(struct AVCodecContext *s, const enum PixelFormat * fmt);
1501
1502 /**
1503 * DTG active format information (additional aspect ratio
1504 * information only used in DVB MPEG-2 transport streams)
1505 * 0 if not set.
1506 *
1507 * - encoding: unused
1508 * - decoding: Set by decoder.
1509 */
1510 int dtg_active_format;
1511 #define FF_DTG_AFD_SAME 8
1512 #define FF_DTG_AFD_4_3 9
1513 #define FF_DTG_AFD_16_9 10
1514 #define FF_DTG_AFD_14_9 11
1515 #define FF_DTG_AFD_4_3_SP_14_9 13
1516 #define FF_DTG_AFD_16_9_SP_14_9 14
1517 #define FF_DTG_AFD_SP_4_3 15
1518
1519 /**
1520 * maximum motion estimation search range in subpel units
1521 * If 0 then no limit.
1522 *
1523 * - encoding: Set by user.
1524 * - decoding: unused
1525 */
1526 int me_range;
1527
1528 /**
1529 * intra quantizer bias
1530 * - encoding: Set by user.
1531 * - decoding: unused
1532 */
1533 int intra_quant_bias;
1534 #define FF_DEFAULT_QUANT_BIAS 999999
1535
1536 /**
1537 * inter quantizer bias
1538 * - encoding: Set by user.
1539 * - decoding: unused
1540 */
1541 int inter_quant_bias;
1542
1543 /**
1544 * color table ID
1545 * - encoding: unused
1546 * - decoding: Which clrtable should be used for 8bit RGB images.
1547 * Tables have to be stored somewhere. FIXME
1548 */
1549 int color_table_id;
1550
1551 /**
1552 * internal_buffer count
1553 * Don't touch, used by libavcodec default_get_buffer().
1554 */
1555 int internal_buffer_count;
1556
1557 /**
1558 * internal_buffers
1559 * Don't touch, used by libavcodec default_get_buffer().
1560 */
1561 void *internal_buffer;
1562
1563 #define FF_LAMBDA_SHIFT 7
1564 #define FF_LAMBDA_SCALE (1<<FF_LAMBDA_SHIFT)
1565 #define FF_QP2LAMBDA 118 ///< factor to convert from H.263 QP to lambda
1566 #define FF_LAMBDA_MAX (256*128-1)
1567
1568 #define FF_QUALITY_SCALE FF_LAMBDA_SCALE //FIXME maybe remove
1569 /**
1570 * Global quality for codecs which cannot change it per frame.
1571 * This should be proportional to MPEG-1/2/4 qscale.
1572 * - encoding: Set by user.
1573 * - decoding: unused
1574 */
1575 int global_quality;
1576
1577 #define FF_CODER_TYPE_VLC 0
1578 #define FF_CODER_TYPE_AC 1
1579 #define FF_CODER_TYPE_RAW 2
1580 #define FF_CODER_TYPE_RLE 3
1581 #define FF_CODER_TYPE_DEFLATE 4
1582 /**
1583 * coder type
1584 * - encoding: Set by user.
1585 * - decoding: unused
1586 */
1587 int coder_type;
1588
1589 /**
1590 * context model
1591 * - encoding: Set by user.
1592 * - decoding: unused
1593 */
1594 int context_model;
1595 #if 0
1596 /**
1597 *
1598 * - encoding: unused
1599 * - decoding: Set by user.
1600 */
1601 uint8_t * (*realloc)(struct AVCodecContext *s, uint8_t *buf, int buf_size);
1602 #endif
1603
1604 /**
1605 * slice flags
1606 * - encoding: unused
1607 * - decoding: Set by user.
1608 */
1609 int slice_flags;
1610 #define SLICE_FLAG_CODED_ORDER 0x0001 ///< draw_horiz_band() is called in coded order instead of display
1611 #define SLICE_FLAG_ALLOW_FIELD 0x0002 ///< allow draw_horiz_band() with field slices (MPEG2 field pics)
1612 #define SLICE_FLAG_ALLOW_PLANE 0x0004 ///< allow draw_horiz_band() with 1 component at a time (SVQ1)
1613
1614 /**
1615 * XVideo Motion Acceleration
1616 * - encoding: forbidden
1617 * - decoding: set by decoder
1618 */
1619 int xvmc_acceleration;
1620
1621 /**
1622 * macroblock decision mode
1623 * - encoding: Set by user.
1624 * - decoding: unused
1625 */
1626 int mb_decision;
1627 #define FF_MB_DECISION_SIMPLE 0 ///< uses mb_cmp
1628 #define FF_MB_DECISION_BITS 1 ///< chooses the one which needs the fewest bits
1629 #define FF_MB_DECISION_RD 2 ///< rate distoration
1630
1631 /**
1632 * custom intra quantization matrix
1633 * - encoding: Set by user, can be NULL.
1634 * - decoding: Set by libavcodec.
1635 */
1636 uint16_t *intra_matrix;
1637
1638 /**
1639 * custom inter quantization matrix
1640 * - encoding: Set by user, can be NULL.
1641 * - decoding: Set by libavcodec.
1642 */
1643 uint16_t *inter_matrix;
1644
1645 /**
1646 * fourcc from the AVI stream header (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A').
1647 * This is used to work around some encoder bugs.
1648 * - encoding: unused
1649 * - decoding: Set by user, will be converted to uppercase by libavcodec during init.
1650 */
1651 unsigned int stream_codec_tag;
1652
1653 /**
1654 * scene change detection threshold
1655 * 0 is default, larger means fewer detected scene changes.
1656 * - encoding: Set by user.
1657 * - decoding: unused
1658 */
1659 int scenechange_threshold;
1660
1661 /**
1662 * minimum Lagrange multipler
1663 * - encoding: Set by user.
1664 * - decoding: unused
1665 */
1666 int lmin;
1667
1668 /**
1669 * maximum Lagrange multipler
1670 * - encoding: Set by user.
1671 * - decoding: unused
1672 */
1673 int lmax;
1674
1675 /**
1676 * palette control structure
1677 * - encoding: ??? (no palette-enabled encoder yet)
1678 * - decoding: Set by user.
1679 */
1680 struct AVPaletteControl *palctrl;
1681
1682 /**
1683 * noise reduction strength
1684 * - encoding: Set by user.
1685 * - decoding: unused
1686 */
1687 int noise_reduction;
1688
1689 /**
1690 * Called at the beginning of a frame to get cr buffer for it.
1691 * Buffer type (size, hints) must be the same. libavcodec won't check it.
1692 * libavcodec will pass previous buffer in pic, function should return
1693 * same buffer or new buffer with old frame "painted" into it.
1694 * If pic.data[0] == NULL must behave like get_buffer().
1695 * - encoding: unused
1696 * - decoding: Set by libavcodec., user can override
1697 */
1698 int (*reget_buffer)(struct AVCodecContext *c, AVFrame *pic);
1699
1700 /**
1701 * Number of bits which should be loaded into the rc buffer before decoding starts.
1702 * - encoding: Set by user.
1703 * - decoding: unused
1704 */
1705 int rc_initial_buffer_occupancy;
1706
1707 /**
1708 *
1709 * - encoding: Set by user.
1710 * - decoding: unused
1711 */
1712 int inter_threshold;
1713
1714 /**
1715 * CODEC_FLAG2_*
1716 * - encoding: Set by user.
1717 * - decoding: Set by user.
1718 */
1719 int flags2;
1720
1721 /**
1722 * Simulates errors in the bitstream to test error concealment.
1723 * - encoding: Set by user.
1724 * - decoding: unused
1725 */
1726 int error_rate;
1727
1728 /**
1729 * MP3 antialias algorithm, see FF_AA_* below.
1730 * - encoding: unused
1731 * - decoding: Set by user.
1732 */
1733 int antialias_algo;
1734 #define FF_AA_AUTO 0
1735 #define FF_AA_FASTINT 1 //not implemented yet
1736 #define FF_AA_INT 2
1737 #define FF_AA_FLOAT 3
1738 /**
1739 * quantizer noise shaping
1740 * - encoding: Set by user.
1741 * - decoding: unused
1742 */
1743 int quantizer_noise_shaping;
1744
1745 /**
1746 * thread count
1747 * is used to decide how many independent tasks should be passed to execute()
1748 * - encoding: Set by user.
1749 * - decoding: Set by user.
1750 */
1751 int thread_count;
1752
1753 /**
1754 * The codec may call this to execute several independent things.
1755 * It will return only after finishing all tasks.
1756 * The user may replace this with some multithreaded implementation,
1757 * the default implementation will execute the parts serially.
1758 * @param count the number of things to execute
1759 * - encoding: Set by libavcodec, user can override.
1760 * - decoding: Set by libavcodec, user can override.
1761 */
1762 int (*execute)(struct AVCodecContext *c, int (*func)(struct AVCodecContext *c2, void *arg), void **arg2, int *ret, int count);
1763
1764 /**
1765 * thread opaque
1766 * Can be used by execute() to store some per AVCodecContext stuff.
1767 * - encoding: set by execute()
1768 * - decoding: set by execute()
1769 */
1770 void *thread_opaque;
1771
1772 /**
1773 * Motion estimation threshold below which no motion estimation is
1774 * performed, but instead the user specified motion vectors are used.
1775 *
1776 * - encoding: Set by user.
1777 * - decoding: unused
1778 */
1779 int me_threshold;
1780
1781 /**
1782 * Macroblock threshold below which the user specified macroblock types will be used.
1783 * - encoding: Set by user.
1784 * - decoding: unused
1785 */
1786 int mb_threshold;
1787
1788 /**
1789 * precision of the intra DC coefficient - 8
1790 * - encoding: Set by user.
1791 * - decoding: unused
1792 */
1793 int intra_dc_precision;
1794
1795 /**
1796 * noise vs. sse weight for the nsse comparsion function
1797 * - encoding: Set by user.
1798 * - decoding: unused
1799 */
1800 int nsse_weight;
1801
1802 /**
1803 * Number of macroblock rows at the top which are skipped.
1804 * - encoding: unused
1805 * - decoding: Set by user.
1806 */
1807 int skip_top;
1808
1809 /**
1810 * Number of macroblock rows at the bottom which are skipped.
1811 * - encoding: unused
1812 * - decoding: Set by user.
1813 */
1814 int skip_bottom;
1815
1816 /**
1817 * profile
1818 * - encoding: Set by user.
1819 * - decoding: Set by libavcodec.
1820 */
1821 int profile;
1822 #define FF_PROFILE_UNKNOWN -99
1823 #define FF_PROFILE_AAC_MAIN 0
1824 #define FF_PROFILE_AAC_LOW 1
1825 #define FF_PROFILE_AAC_SSR 2
1826 #define FF_PROFILE_AAC_LTP 3
1827
1828 /**
1829 * level
1830 * - encoding: Set by user.
1831 * - decoding: Set by libavcodec.
1832 */
1833 int level;
1834 #define FF_LEVEL_UNKNOWN -99
1835
1836 /**
1837 * low resolution decoding, 1-> 1/2 size, 2->1/4 size
1838 * - encoding: unused
1839 * - decoding: Set by user.
1840 */
1841 int lowres;
1842
1843 /**
1844 * Bitstream width / height, may be different from width/height if lowres
1845 * or other things are used.
1846 * - encoding: unused
1847 * - decoding: Set by user before init if known. Codec should override / dynamically change if needed.
1848 */
1849 int coded_width, coded_height;
1850
1851 /**
1852 * frame skip threshold
1853 * - encoding: Set by user.
1854 * - decoding: unused
1855 */
1856 int frame_skip_threshold;
1857
1858 /**
1859 * frame skip factor
1860 * - encoding: Set by user.
1861 * - decoding: unused
1862 */
1863 int frame_skip_factor;
1864
1865 /**
1866 * frame skip exponent
1867 * - encoding: Set by user.
1868 * - decoding: unused
1869 */
1870 int frame_skip_exp;
1871
1872 /**
1873 * frame skip comparison function
1874 * - encoding: Set by user.
1875 * - decoding: unused
1876 */
1877 int frame_skip_cmp;
1878
1879 /**
1880 * Border processing masking, raises the quantizer for mbs on the borders
1881 * of the picture.
1882 * - encoding: Set by user.
1883 * - decoding: unused
1884 */
1885 float border_masking;
1886
1887 /**
1888 * minimum MB lagrange multipler
1889 * - encoding: Set by user.
1890 * - decoding: unused
1891 */
1892 int mb_lmin;
1893
1894 /**
1895 * maximum MB lagrange multipler
1896 * - encoding: Set by user.
1897 * - decoding: unused
1898 */
1899 int mb_lmax;
1900
1901 /**
1902 *
1903 * - encoding: Set by user.
1904 * - decoding: unused
1905 */
1906 int me_penalty_compensation;
1907
1908 /**
1909 *
1910 * - encoding: unused
1911 * - decoding: Set by user.
1912 */
1913 enum AVDiscard skip_loop_filter;
1914
1915 /**
1916 *
1917 * - encoding: unused
1918 * - decoding: Set by user.
1919 */
1920 enum AVDiscard skip_idct;
1921
1922 /**
1923 *
1924 * - encoding: unused
1925 * - decoding: Set by user.
1926 */
1927 enum AVDiscard skip_frame;
1928
1929 /**
1930 *
1931 * - encoding: Set by user.
1932 * - decoding: unused
1933 */
1934 int bidir_refine;
1935
1936 /**
1937 *
1938 * - encoding: Set by user.
1939 * - decoding: unused
1940 */
1941 int brd_scale;
1942
1943 /**
1944 * constant rate factor - quality-based VBR - values ~correspond to qps
1945 * - encoding: Set by user.
1946 * - decoding: unused
1947 */
1948 float crf;
1949
1950 /**
1951 * constant quantization parameter rate control method
1952 * - encoding: Set by user.
1953 * - decoding: unused
1954 */
1955 int cqp;
1956
1957 /**
1958 * minimum GOP size
1959 * - encoding: Set by user.
1960 * - decoding: unused
1961 */
1962 int keyint_min;
1963
1964 /**
1965 * number of reference frames
1966 * - encoding: Set by user.
1967 * - decoding: unused
1968 */
1969 int refs;
1970
1971 /**
1972 * chroma qp offset from luma
1973 * - encoding: Set by user.
1974 * - decoding: unused
1975 */
1976 int chromaoffset;
1977
1978 /**
1979 * Influences how often B-frames are used.
1980 * - encoding: Set by user.
1981 * - decoding: unused
1982 */
1983 int bframebias;
1984
1985 /**
1986 * trellis RD quantization
1987 * - encoding: Set by user.
1988 * - decoding: unused
1989 */
1990 int trellis;
1991
1992 /**
1993 * Reduce fluctuations in qp (before curve compression).
1994 * - encoding: Set by user.
1995 * - decoding: unused
1996 */
1997 float complexityblur;
1998
1999 /**
2000 * in-loop deblocking filter alphac0 parameter
2001 * alpha is in the range -6...6
2002 * - encoding: Set by user.
2003 * - decoding: unused
2004 */
2005 int deblockalpha;
2006
2007 /**
2008 * in-loop deblocking filter beta parameter
2009 * beta is in the range -6...6
2010 * - encoding: Set by user.
2011 * - decoding: unused
2012 */
2013 int deblockbeta;
2014
2015 /**
2016 * macroblock subpartition sizes to consider - p8x8, p4x4, b8x8, i8x8, i4x4
2017 * - encoding: Set by user.
2018 * - decoding: unused
2019 */
2020 int partitions;
2021 #define X264_PART_I4X4 0x001 /* Analyse i4x4 */
2022 #define X264_PART_I8X8 0x002 /* Analyse i8x8 (requires 8x8 transform) */
2023 #define X264_PART_P8X8 0x010 /* Analyse p16x8, p8x16 and p8x8 */
2024 #define X264_PART_P4X4 0x020 /* Analyse p8x4, p4x8, p4x4 */
2025 #define X264_PART_B8X8 0x100 /* Analyse b16x8, b8x16 and b8x8 */
2026
2027 /**
2028 * direct MV prediction mode - 0 (none), 1 (spatial), 2 (temporal)
2029 * - encoding: Set by user.
2030 * - decoding: unused
2031 */
2032 int directpred;
2033
2034 /**
2035 * Audio cutoff bandwidth (0 means "automatic"), currently used only by FAAC.
2036 * - encoding: Set by user.
2037 * - decoding: unused
2038 */
2039 int cutoff;
2040
2041 /**
2042 * Multiplied by qscale for each frame and added to scene_change_score.
2043 * - encoding: Set by user.
2044 * - decoding: unused
2045 */
2046 int scenechange_factor;
2047
2048 /**
2049 *
2050 * Note: Value depends upon the compare function used for fullpel ME.
2051 * - encoding: Set by user.
2052 * - decoding: unused
2053 */
2054 int mv0_threshold;
2055
2056 /**
2057 * Adjusts sensitivity of b_frame_strategy 1.
2058 * - encoding: Set by user.
2059 * - decoding: unused
2060 */
2061 int b_sensitivity;
2062
2063 /**
2064 * - encoding: Set by user.
2065 * - decoding: unused
2066 */
2067 int compression_level;
2068 #define FF_COMPRESSION_DEFAULT -1
2069
2070 /**
2071 * Sets whether to use LPC mode - used by FLAC encoder.
2072 * - encoding: Set by user.
2073 * - decoding: unused
2074 */
2075 int use_lpc;
2076
2077 /**
2078 * LPC coefficient precision - used by FLAC encoder
2079 * - encoding: Set by user.
2080 * - decoding: unused
2081 */
2082 int lpc_coeff_precision;
2083
2084 /**
2085 * - encoding: Set by user.
2086 * - decoding: unused
2087 */
2088 int min_prediction_order;
2089
2090 /**
2091 * - encoding: Set by user.
2092 * - decoding: unused
2093 */
2094 int max_prediction_order;
2095
2096 /**
2097 * search method for selecting prediction order
2098 * - encoding: Set by user.
2099 * - decoding: unused
2100 */
2101 int prediction_order_method;
2102
2103 /**
2104 * - encoding: Set by user.
2105 * - decoding: unused
2106 */
2107 int min_partition_order;
2108
2109 /**
2110 * - encoding: Set by user.
2111 * - decoding: unused
2112 */
2113 int max_partition_order;
2114
2115 /**
2116 * GOP timecode frame start number, in non drop frame format
2117 * - encoding: Set by user.
2118 * - decoding: unused
2119 */
2120 int64_t timecode_frame_start;
2121 } AVCodecContext;
2122
2123 /**
2124 * AVCodec.
2125 */
2126 typedef struct AVCodec {
2127 const char *name;
2128 enum CodecType type;
2129 enum CodecID id;
2130 int priv_data_size;
2131 int (*init)(AVCodecContext *);
2132 int (*encode)(AVCodecContext *, uint8_t *buf, int buf_size, void *data);
2133 int (*close)(AVCodecContext *);
2134 int (*decode)(AVCodecContext *, void *outdata, int *outdata_size,
2135 uint8_t *buf, int buf_size);
2136 int capabilities;
2137 struct AVCodec *next;
2138 void (*flush)(AVCodecContext *);
2139 const AVRational *supported_framerates; ///array of supported framerates, or NULL if any, array is terminated by {0,0}
2140 const enum PixelFormat *pix_fmts; ///array of supported pixel formats, or NULL if unknown, array is terminanted by -1
2141 } AVCodec;
2142
2143 /**
2144 * four components are given, that's all.
2145 * the last component is alpha
2146 */
2147 typedef struct AVPicture {
2148 uint8_t *data[4];
2149 int linesize[4]; ///< number of bytes per line
2150 } AVPicture;
2151
2152 /**
2153 * AVPaletteControl
2154 * This structure defines a method for communicating palette changes
2155 * between and demuxer and a decoder.
2156 *
2157 * @deprecated Use AVPacket to send palette changes instead.
2158 * This is totally broken.
2159 */
2160 #define AVPALETTE_SIZE 1024
2161 #define AVPALETTE_COUNT 256
2162 typedef struct AVPaletteControl {
2163
2164 /* Demuxer sets this to 1 to indicate the palette has changed;
2165 * decoder resets to 0. */
2166 int palette_changed;
2167
2168 /* 4-byte ARGB palette entries, stored in native byte order; note that
2169 * the individual palette components should be on a 8-bit scale; if
2170 * the palette data comes from an IBM VGA native format, the component
2171 * data is probably 6 bits in size and needs to be scaled. */
2172 unsigned int palette[AVPALETTE_COUNT];
2173
2174 } AVPaletteControl attribute_deprecated;
2175
2176 typedef struct AVSubtitleRect {
2177 uint16_t x;
2178 uint16_t y;
2179 uint16_t w;
2180 uint16_t h;
2181 uint16_t nb_colors;
2182 int linesize;
2183 uint32_t *rgba_palette;
2184 uint8_t *bitmap;
2185 } AVSubtitleRect;
2186
2187 typedef struct AVSubtitle {
2188 uint16_t format; /* 0 = graphics */
2189 uint32_t start_display_time; /* relative to packet pts, in ms */
2190 uint32_t end_display_time; /* relative to packet pts, in ms */
2191 uint32_t num_rects;
2192 AVSubtitleRect *rects;
2193 } AVSubtitle;
2194
2195 extern AVCodec ac3_encoder;
2196 extern AVCodec asv1_encoder;
2197 extern AVCodec asv2_encoder;
2198 extern AVCodec bmp_encoder;
2199 extern AVCodec dvvideo_encoder;
2200 extern AVCodec ffv1_encoder;
2201 extern AVCodec ffvhuff_encoder;
2202 extern AVCodec flac_encoder;
2203 extern AVCodec flashsv_encoder;
2204 extern AVCodec flv_encoder;
2205 extern AVCodec gif_encoder;
2206 extern AVCodec h261_encoder;
2207 extern AVCodec h263_encoder;
2208 extern AVCodec h263p_encoder;
2209 extern AVCodec h264_encoder;
2210 extern AVCodec huffyuv_encoder;
2211 extern AVCodec jpegls_encoder;
2212 extern AVCodec ljpeg_encoder;
2213 extern AVCodec mdec_encoder;
2214 extern AVCodec mjpeg_encoder;
2215 extern AVCodec mp2_encoder;
2216 extern AVCodec mpeg1video_encoder;
2217 extern AVCodec mpeg2video_encoder;
2218 extern AVCodec mpeg4_encoder;
2219 extern AVCodec msmpeg4v1_encoder;
2220 extern AVCodec msmpeg4v2_encoder;
2221 extern AVCodec msmpeg4v3_encoder;
2222 extern AVCodec pam_encoder;
2223 extern AVCodec pbm_encoder;
2224 extern AVCodec pgm_encoder;
2225 extern AVCodec pgmyuv_encoder;
2226 extern AVCodec png_encoder;
2227 extern AVCodec ppm_encoder;
2228 extern AVCodec roq_dpcm_encoder;
2229 extern AVCodec rv10_encoder;
2230 extern AVCodec rv20_encoder;
2231 extern AVCodec sgi_encoder;
2232 extern AVCodec snow_encoder;
2233 extern AVCodec sonic_encoder;
2234 extern AVCodec sonic_ls_encoder;
2235 extern AVCodec svq1_encoder;
2236 extern AVCodec targa_encoder;
2237 extern AVCodec tiff_encoder;
2238 extern AVCodec vcr1_encoder;
2239 extern AVCodec vorbis_encoder;
2240 extern AVCodec wmav1_encoder;
2241 extern AVCodec wmav2_encoder;
2242 extern AVCodec wmv1_encoder;
2243 extern AVCodec wmv2_encoder;
2244 extern AVCodec zmbv_encoder;
2245
2246 extern AVCodec aasc_decoder;
2247 extern AVCodec alac_decoder;
2248 extern AVCodec asv1_decoder;
2249 extern AVCodec asv2_decoder;
2250 extern AVCodec atrac3_decoder;
2251 extern AVCodec avs_decoder;
2252 extern AVCodec bethsoftvid_decoder;
2253 extern AVCodec bmp_decoder;
2254 extern AVCodec c93_decoder;
2255 extern AVCodec cavs_decoder;
2256 extern AVCodec cinepak_decoder;
2257 extern AVCodec cljr_decoder;
2258 extern AVCodec cook_decoder;
2259 extern AVCodec cscd_decoder;
2260 extern AVCodec cyuv_decoder;
2261 extern AVCodec dca_decoder;
2262 extern AVCodec dnxhd_decoder;
2263 extern AVCodec dsicinaudio_decoder;
2264 extern AVCodec dsicinvideo_decoder;
2265 extern AVCodec dvvideo_decoder;
2266 extern AVCodec dxa_decoder;
2267 extern AVCodec eightbps_decoder;
2268 extern AVCodec ffv1_decoder;
2269 extern AVCodec ffvhuff_decoder;
2270 extern AVCodec flac_decoder;
2271 extern AVCodec flashsv_decoder;
2272 extern AVCodec flic_decoder;
2273 extern AVCodec flv_decoder;
2274 extern AVCodec fourxm_decoder;
2275 extern AVCodec fraps_decoder;
2276 extern AVCodec gif_decoder;
2277 extern AVCodec h261_decoder;
2278 extern AVCodec h263_decoder;
2279 extern AVCodec h263i_decoder;
2280 extern AVCodec h264_decoder;
2281 extern AVCodec huffyuv_decoder;
2282 extern AVCodec idcin_decoder;
2283 extern AVCodec imc_decoder;
2284 extern AVCodec indeo2_decoder;
2285 extern AVCodec indeo3_decoder;
2286 extern AVCodec interplay_dpcm_decoder;
2287 extern AVCodec interplay_video_decoder;
2288 extern AVCodec kmvc_decoder;
2289 extern AVCodec loco_decoder;
2290 extern AVCodec mace3_decoder;
2291 extern AVCodec mace6_decoder;
2292 extern AVCodec mdec_decoder;
2293 extern AVCodec mjpeg_decoder;
2294 extern AVCodec mjpegb_decoder;
2295 extern AVCodec mmvideo_decoder;
2296 extern AVCodec mp2_decoder;
2297 extern AVCodec mp3_decoder;
2298 extern AVCodec mp3adu_decoder;
2299 extern AVCodec mp3on4_decoder;
2300 extern AVCodec mpc7_decoder;
2301 extern AVCodec mpeg1video_decoder;
2302 extern AVCodec mpeg2video_decoder;
2303 extern AVCodec mpeg4_decoder;
2304 extern AVCodec mpeg_xvmc_decoder;
2305 extern AVCodec mpegvideo_decoder;
2306 extern AVCodec msmpeg4v1_decoder;
2307 extern AVCodec msmpeg4v2_decoder;
2308 extern AVCodec msmpeg4v3_decoder;
2309 extern AVCodec msrle_decoder;
2310 extern AVCodec msvideo1_decoder;
2311 extern AVCodec mszh_decoder;
2312 extern AVCodec nuv_decoder;
2313 extern AVCodec png_decoder;
2314 extern AVCodec ptx_decoder;
2315 extern AVCodec qdm2_decoder;
2316 extern AVCodec qdraw_decoder;
2317 extern AVCodec qpeg_decoder;
2318 extern AVCodec qtrle_decoder;
2319 extern AVCodec ra_144_decoder;
2320 extern AVCodec ra_288_decoder;
2321 extern AVCodec roq_decoder;
2322 extern AVCodec roq_dpcm_decoder;
2323 extern AVCodec rpza_decoder;
2324 extern AVCodec rv10_decoder;
2325 extern AVCodec rv20_decoder;
2326 extern AVCodec rv30_decoder;
2327 extern AVCodec rv40_decoder;
2328 extern AVCodec sgi_decoder;
2329 extern AVCodec shorten_decoder;
2330 extern AVCodec smackaud_decoder;
2331 extern AVCodec smacker_decoder;
2332 extern AVCodec smc_decoder;
2333 extern AVCodec snow_decoder;
2334 extern AVCodec sol_dpcm_decoder;
2335 extern AVCodec sonic_decoder;
2336 extern AVCodec sp5x_decoder;
2337 extern AVCodec svq1_decoder;
2338 extern AVCodec svq3_decoder;
2339 extern AVCodec targa_decoder;
2340 extern AVCodec theora_decoder;
2341 extern AVCodec thp_decoder;
2342 extern AVCodec tiertexseqvideo_decoder;
2343 extern AVCodec tiff_decoder;
2344 extern AVCodec truemotion1_decoder;
2345 extern AVCodec truemotion2_decoder;
2346 extern AVCodec truespeech_decoder;
2347 extern AVCodec tscc_decoder;
2348 extern AVCodec tta_decoder;
2349 extern AVCodec ulti_decoder;
2350 extern AVCodec vc1_decoder;
2351 extern AVCodec vcr1_decoder;
2352 extern AVCodec vmdaudio_decoder;
2353 extern AVCodec vmdvideo_decoder;
2354 extern AVCodec vmnc_decoder;
2355 extern AVCodec vorbis_decoder;
2356 extern AVCodec vp3_decoder;
2357 extern AVCodec vp5_decoder;
2358 extern AVCodec vp6_decoder;
2359 extern AVCodec vp6f_decoder;
2360 extern AVCodec vqa_decoder;
2361 extern AVCodec wavpack_decoder;
2362 extern AVCodec wmav1_decoder;
2363 extern AVCodec wmav2_decoder;
2364 extern AVCodec wmv1_decoder;
2365 extern AVCodec wmv2_decoder;
2366 extern AVCodec wmv3_decoder;
2367 extern AVCodec wnv1_decoder;
2368 extern AVCodec ws_snd1_decoder;
2369 extern AVCodec xan_dpcm_decoder;
2370 extern AVCodec xan_wc3_decoder;
2371 extern AVCodec xl_decoder;
2372 extern AVCodec zmbv_decoder;
2373
2374 /* PCM codecs */
2375 #define PCM_CODEC(id, name) \
2376 extern AVCodec name ## _decoder; \
2377 extern AVCodec name ## _encoder
2378
2379 PCM_CODEC(CODEC_ID_PCM_ALAW, pcm_alaw);
2380 PCM_CODEC(CODEC_ID_PCM_MULAW, pcm_mulaw);
2381 PCM_CODEC(CODEC_ID_PCM_S8, pcm_s8);
2382 PCM_CODEC(CODEC_ID_PCM_S16BE, pcm_s16be);
2383 PCM_CODEC(CODEC_ID_PCM_S16LE, pcm_s16le);
2384 PCM_CODEC(CODEC_ID_PCM_S24BE, pcm_s24be);
2385 PCM_CODEC(CODEC_ID_PCM_S24DAUD, pcm_s24daud);
2386 PCM_CODEC(CODEC_ID_PCM_S24LE, pcm_s24le);
2387 PCM_CODEC(CODEC_ID_PCM_S32BE, pcm_s32be);
2388 PCM_CODEC(CODEC_ID_PCM_S32LE, pcm_s32le);
2389 PCM_CODEC(CODEC_ID_PCM_U8, pcm_u8);
2390 PCM_CODEC(CODEC_ID_PCM_U16BE, pcm_u16be);
2391 PCM_CODEC(CODEC_ID_PCM_U16LE, pcm_u16le);
2392 PCM_CODEC(CODEC_ID_PCM_U24BE, pcm_u24be);
2393 PCM_CODEC(CODEC_ID_PCM_U24LE, pcm_u24le);
2394 PCM_CODEC(CODEC_ID_PCM_U32BE, pcm_u32be);
2395 PCM_CODEC(CODEC_ID_PCM_U32LE, pcm_u32le);
2396
2397 /* ADPCM codecs */
2398
2399 PCM_CODEC(CODEC_ID_ADPCM_4XM, adpcm_4xm);
2400 PCM_CODEC(CODEC_ID_ADPCM_ADX, adpcm_adx);
2401 PCM_CODEC(CODEC_ID_ADPCM_CT, adpcm_ct);
2402 PCM_CODEC(CODEC_ID_ADPCM_EA, adpcm_ea);
2403 PCM_CODEC(CODEC_ID_ADPCM_G726, adpcm_g726);
2404 PCM_CODEC(CODEC_ID_ADPCM_IMA_DK3, adpcm_ima_dk3);
2405 PCM_CODEC(CODEC_ID_ADPCM_IMA_DK4, adpcm_ima_dk4);
2406 PCM_CODEC(CODEC_ID_ADPCM_IMA_QT, adpcm_ima_qt);
2407 PCM_CODEC(CODEC_ID_ADPCM_IMA_WAV, adpcm_ima_wav);
2408 PCM_CODEC(CODEC_ID_ADPCM_IMA_WS, adpcm_ima_ws);
2409 PCM_CODEC(CODEC_ID_ADPCM_MS, adpcm_ms);
2410 PCM_CODEC(CODEC_ID_ADPCM_SBPRO_2, adpcm_sbpro_2);
2411 PCM_CODEC(CODEC_ID_ADPCM_SBPRO_3, adpcm_sbpro_3);
2412 PCM_CODEC(CODEC_ID_ADPCM_SBPRO_4, adpcm_sbpro_4);
2413 PCM_CODEC(CODEC_ID_ADPCM_SMJPEG, adpcm_ima_smjpeg);
2414 PCM_CODEC(CODEC_ID_ADPCM_SWF, adpcm_swf);
2415 PCM_CODEC(CODEC_ID_ADPCM_THP, adpcm_thp);
2416 PCM_CODEC(CODEC_ID_ADPCM_XA, adpcm_xa);
2417 PCM_CODEC(CODEC_ID_ADPCM_YAMAHA, adpcm_yamaha);
2418
2419 #undef PCM_CODEC
2420
2421 /* dummy raw video codec */
2422 extern AVCodec rawvideo_decoder;
2423 extern AVCodec rawvideo_encoder;
2424
2425 /* the following codecs use external libs */
2426 extern AVCodec aac_decoder;
2427 extern AVCodec faac_encoder;
2428 extern AVCodec liba52_decoder;
2429 extern AVCodec libamr_nb_decoder;
2430 extern AVCodec libamr_nb_encoder;
2431 extern AVCodec libamr_wb_decoder;
2432 extern AVCodec libamr_wb_encoder;
2433 extern AVCodec libdts_decoder;
2434 extern AVCodec libgsm_decoder;
2435 extern AVCodec libgsm_encoder;
2436 extern AVCodec libgsm_ms_decoder;
2437 extern AVCodec libgsm_ms_encoder;
2438 extern AVCodec libtheora_encoder;
2439 extern AVCodec libvorbis_decoder;
2440 extern AVCodec libvorbis_encoder;
2441 extern AVCodec mp3lame_encoder;
2442 extern AVCodec mpeg4aac_decoder;
2443 extern AVCodec x264_encoder;
2444 extern AVCodec xvid_encoder;
2445 extern AVCodec zlib_decoder;
2446 extern AVCodec zlib_encoder;
2447
2448 /* subtitles */
2449 extern AVCodec dvbsub_decoder;
2450 extern AVCodec dvbsub_encoder;
2451 extern AVCodec dvdsub_decoder;
2452 extern AVCodec dvdsub_encoder;
2453
2454 /* resample.c */
2455
2456 struct ReSampleContext;
2457 struct AVResampleContext;
2458
2459 typedef struct ReSampleContext ReSampleContext;
2460
2461 ReSampleContext *audio_resample_init(int output_channels, int input_channels,
2462 int output_rate, int input_rate);
2463 int audio_resample(ReSampleContext *s, short *output, short *input, int nb_samples);
2464 void audio_resample_close(ReSampleContext *s);
2465
2466 struct AVResampleContext *av_resample_init(int out_rate, int in_rate, int filter_length, int log2_phase_count, int linear, double cutoff);
2467 int av_resample(struct AVResampleContext *c, short *dst, short *src, int *consumed, int src_size, int dst_size, int update_ctx);
2468 void av_resample_compensate(struct AVResampleContext *c, int sample_delta, int compensation_distance);
2469 void av_resample_close(struct AVResampleContext *c);
2470
2471 #if LIBAVCODEC_VERSION_INT < ((52<<16)+(0<<8)+0)
2472 /* YUV420 format is assumed ! */
2473
2474 /**
2475 * @deprecated Use the software scaler (swscale) instead.
2476 */
2477 struct ImgReSampleContext attribute_deprecated;
2478
2479 /**
2480 * @deprecated Use the software scaler (swscale) instead.
2481 */
2482 typedef struct ImgReSampleContext ImgReSampleContext attribute_deprecated;
2483
2484 /**
2485 * @deprecated Use the software scaler (swscale) instead.
2486 */
2487 attribute_deprecated ImgReSampleContext *img_resample_init(int output_width, int output_height,
2488 int input_width, int input_height);
2489
2490 /**
2491 * @deprecated Use the software scaler (swscale) instead.
2492 */
2493 attribute_deprecated ImgReSampleContext *img_resample_full_init(int owidth, int oheight,
2494 int iwidth, int iheight,
2495 int topBand, int bottomBand,
2496 int leftBand, int rightBand,
2497 int padtop, int padbottom,
2498 int padleft, int padright);
2499
2500 /**
2501 * @deprecated Use the software scaler (swscale) instead.
2502 */
2503 attribute_deprecated void img_resample(ImgReSampleContext *s,
2504 AVPicture *output, const AVPicture *input);
2505
2506 /**
2507 * @deprecated Use the software scaler (swscale) instead.
2508 */
2509 attribute_deprecated void img_resample_close(ImgReSampleContext *s);
2510
2511 #endif
2512
2513 /**
2514 * Allocate memory for a picture. Call avpicture_free to free it.
2515 *
2516 * @param picture the picture to be filled in
2517 * @param pix_fmt the format of the picture
2518 * @param width the width of the picture
2519 * @param height the height of the picture
2520 * @return zero if successful, a negative value if not
2521 */
2522 int avpicture_alloc(AVPicture *picture, int pix_fmt, int width, int height);
2523
2524 /**
2525 * Free a picture previously allocated by avpicture_alloc().
2526 *
2527 * @param picture the AVPicture to be freed
2528 */
2529 void avpicture_free(AVPicture *picture);
2530
2531 /**
2532 * Fill in the AVPicture fields.
2533 * The fields of the given AVPicture are filled in by using the 'ptr' address
2534 * which points to the image data buffer. Depending on the specified picture
2535 * format, one or multiple image data pointers and line sizes will be set.
2536 * If a planar format is specified, several pointers will be set pointing to
2537 * the different picture planes and the line sizes of the different planes
2538 * will be stored in the lines_sizes array.
2539 *
2540 * @param picture AVPicture whose fields are to be filled in
2541 * @param ptr Buffer which will contain or contains the actual image data
2542 * @param pix_fmt The format in which the picture data is stored.
2543 * @param width the width of the image in pixels
2544 * @param height the height of the image in pixels
2545 * @return size of the image data in bytes
2546 */
2547 int avpicture_fill(AVPicture *picture, uint8_t *ptr,
2548 int pix_fmt, int width, int height);
2549 int avpicture_layout(const AVPicture* src, int pix_fmt, int width, int height,
2550 unsigned char *dest, int dest_size);
2551
2552 /**
2553 * Calculate the size in bytes that a picture of the given width and height
2554 * would occupy if stored in the given picture format.
2555 *
2556 * @param pix_fmt the given picture format
2557 * @param width the width of the image
2558 * @param height the height of the image
2559 * @return Image data size in bytes
2560 */
2561 int avpicture_get_size(int pix_fmt, int width, int height);
2562 void avcodec_get_chroma_sub_sample(int pix_fmt, int *h_shift, int *v_shift);
2563 const char *avcodec_get_pix_fmt_name(int pix_fmt);
2564 void avcodec_set_dimensions(AVCodecContext *s, int width, int height);
2565 enum PixelFormat avcodec_get_pix_fmt(const char* name);
2566 unsigned int avcodec_pix_fmt_to_codec_tag(enum PixelFormat p);
2567
2568 #define FF_LOSS_RESOLUTION 0x0001 /**< loss due to resolution change */
2569 #define FF_LOSS_DEPTH 0x0002 /**< loss due to color depth change */
2570 #define FF_LOSS_COLORSPACE 0x0004 /**< loss due to color space conversion */
2571 #define FF_LOSS_ALPHA 0x0008 /**< loss of alpha bits */
2572 #define FF_LOSS_COLORQUANT 0x0010 /**< loss due to color quantization */
2573 #define FF_LOSS_CHROMA 0x0020 /**< loss of chroma (e.g. RGB to gray conversion) */
2574
2575 /**
2576 * Computes what kind of losses will occur when converting from one specific
2577 * pixel format to another.
2578 * When converting from one pixel format to another, information loss may occur.
2579 * For example, when converting from RGB24 to GRAY, the color information will
2580 * be lost. Similarly, other losses occur when converting from some formats to
2581 * other formats. These losses can involve loss of chroma, but also loss of
2582 * resolution, loss of color depth, loss due to the color space conversion, loss
2583 * of the alpha bits or loss due to color quantization.
2584 * avcodec_get_fix_fmt_loss() informs you about the various types of losses
2585 * which will occur when converting from one pixel format to another.
2586 *
2587 * @param[in] dst_pix_fmt destination pixel format
2588 * @param[in] src_pix_fmt source pixel format
2589 * @param[in] has_alpha Whether the source pixel format alpha channel is used.
2590 * @return Combination of flags informing you what kind of losses will occur.
2591 */
2592 int avcodec_get_pix_fmt_loss(int dst_pix_fmt, int src_pix_fmt,
2593 int has_alpha);
2594
2595 /**
2596 * Finds the best pixel format to convert to given a certain source pixel
2597 * format. When converting from one pixel format to another, information loss
2598 * may occur. For example, when converting from RGB24 to GRAY, the color
2599 * information will be lost. Similarly, other losses occur when converting from
2600 * some formats to other formats. avcodec_find_best_pix_fmt() searches which of
2601 * the given pixel formats should be used to suffer the least amount of loss.
2602 * The pixel formats from which it chooses one, are determined by the
2603 * \p pix_fmt_mask parameter.
2604 *
2605 * @code
2606 * src_pix_fmt = PIX_FMT_YUV420P;
2607 * pix_fmt_mask = (1 << PIX_FMT_YUV422P) || (1 << PIX_FMT_RGB24);
2608 * dst_pix_fmt = avcodec_find_best_pix_fmt(pix_fmt_mask, src_pix_fmt, alpha, &loss);
2609 * @endcode
2610 *
2611 * @param[in] pix_fmt_mask bitmask determining which pixel format to choose from
2612 * @param[in] src_pix_fmt source pixel format
2613 * @param[in] has_alpha Whether the source pixel format alpha channel is used.
2614 * @param[out] loss_ptr Combination of flags informing you what kind of losses will occur.
2615 * @return The best pixel format to convert to or -1 if none was found.
2616 */
2617 int avcodec_find_best_pix_fmt(int pix_fmt_mask, int src_pix_fmt,
2618 int has_alpha, int *loss_ptr);
2619
2620 #define FF_ALPHA_TRANSP 0x0001 /* image has some totally transparent pixels */
2621 #define FF_ALPHA_SEMI_TRANSP 0x0002 /* image has some transparent pixels */
2622
2623 /**
2624 * Tell if an image really has transparent alpha values.
2625 * @return ored mask of FF_ALPHA_xxx constants
2626 */
2627 int img_get_alpha_info(const AVPicture *src,
2628 int pix_fmt, int width, int height);
2629
2630 #if LIBAVCODEC_VERSION_INT < ((52<<16)+(0<<8)+0)
2631 /**
2632 * convert among pixel formats
2633 * @deprecated Use the software scaler (swscale) instead.
2634 */
2635 attribute_deprecated int img_convert(AVPicture *dst, int dst_pix_fmt,
2636 const AVPicture *src, int pix_fmt,
2637 int width, int height);
2638 #endif
2639
2640 /* deinterlace a picture */
2641 /* deinterlace - if not supported return -1 */
2642 int avpicture_deinterlace(AVPicture *dst, const AVPicture *src,
2643 int pix_fmt, int width, int height);
2644
2645 /* external high level API */
2646
2647 extern AVCodec *first_avcodec;
2648
2649 /* returns LIBAVCODEC_VERSION_INT constant */
2650 unsigned avcodec_version(void);
2651 /* returns LIBAVCODEC_BUILD constant */
2652 unsigned avcodec_build(void);
2653
2654 /**
2655 * Initializes libavcodec.
2656 *
2657 * @warning This function \e must be called before any other libavcodec
2658 * function.
2659 */
2660 void avcodec_init(void);
2661
2662 void register_avcodec(AVCodec *format);
2663
2664 /**
2665 * Finds an encoder with a matching codec ID.
2666 *
2667 * @param id CodecID of the requested encoder
2668 * @return An encoder if one was found, NULL otherwise.
2669 */
2670 AVCodec *avcodec_find_encoder(enum CodecID id);
2671
2672 /**
2673 * Finds an encoder with the specified name.
2674 *
2675 * @param name name of the requested encoder
2676 * @return An encoder if one was found, NULL otherwise.
2677 */
2678 AVCodec *avcodec_find_encoder_by_name(const char *name);
2679
2680 /**
2681 * Finds a decoder with a matching codec ID.
2682 *
2683 * @param id CodecID of the requested decoder
2684 * @return A decoder if one was found, NULL otherwise.
2685 */
2686 AVCodec *avcodec_find_decoder(enum CodecID id);
2687
2688 /**
2689 * Finds an decoder with the specified name.
2690 *
2691 * @param name name of the requested decoder
2692 * @return A decoder if one was found, NULL otherwise.
2693 */
2694 AVCodec *avcodec_find_decoder_by_name(const char *name);
2695 void avcodec_string(char *buf, int buf_size, AVCodecContext *enc, int encode);
2696
2697 /**
2698 * Sets the fields of the given AVCodecContext to default values.
2699 *
2700 * @param s The AVCodecContext of which the fields should be set to default values.
2701 */
2702 void avcodec_get_context_defaults(AVCodecContext *s);
2703
2704 /** THIS FUNCTION IS NOT YET PART OF THE PUBLIC API!
2705 * we WILL change its arguments and name a few times! */
2706 void avcodec_get_context_defaults2(AVCodecContext *s, enum CodecType);
2707
2708 /**
2709 * Allocates an AVCodecContext and sets its fields to default values. The
2710 * resulting struct can be deallocated by simply calling av_free().
2711 *
2712 * @return An AVCodecContext filled with default values or NULL on failure.
2713 * @see avcodec_get_context_defaults
2714 */
2715 AVCodecContext *avcodec_alloc_context(void);
2716
2717 /** THIS FUNCTION IS NOT YET PART OF THE PUBLIC API!
2718 * we WILL change its arguments and name a few times! */
2719 AVCodecContext *avcodec_alloc_context2(enum CodecType);
2720
2721 /**
2722 * Sets the fields of the given AVFrame to default values.
2723 *
2724 * @param pic The AVFrame of which the fields should be set to default values.
2725 */
2726 void avcodec_get_frame_defaults(AVFrame *pic);
2727
2728 /**
2729 * Allocates an AVFrame and sets its fields to default values. The resulting
2730 * struct can be deallocated by simply calling av_free().
2731 *
2732 * @return An AVFrame filled with default values or NULL on failure.
2733 * @see avcodec_get_frame_defaults
2734 */
2735 AVFrame *avcodec_alloc_frame(void);
2736
2737 int avcodec_default_get_buffer(AVCodecContext *s, AVFrame *pic);
2738 void avcodec_default_release_buffer(AVCodecContext *s, AVFrame *pic);
2739 int avcodec_default_reget_buffer(AVCodecContext *s, AVFrame *pic);
2740 void avcodec_align_dimensions(AVCodecContext *s, int *width, int *height);
2741
2742 /**
2743 * Checks if the given dimension of a picture is valid, meaning that all
2744 * bytes of the picture can be addressed with a signed int.
2745 *
2746 * @param[in] w Width of the picture.
2747 * @param[in] h Height of the picture.
2748 * @return Zero if valid, a negative value if invalid.
2749 */
2750 int avcodec_check_dimensions(void *av_log_ctx, unsigned int w, unsigned int h);
2751 enum PixelFormat avcodec_default_get_format(struct AVCodecContext *s, const enum PixelFormat * fmt);
2752
2753 int avcodec_thread_init(AVCodecContext *s, int thread_count);
2754 void avcodec_thread_free(AVCodecContext *s);
2755 int avcodec_thread_execute(AVCodecContext *s, int (*func)(AVCodecContext *c2, void *arg2),void **arg, int *ret, int count);
2756 int avcodec_default_execute(AVCodecContext *c, int (*func)(AVCodecContext *c2, void *arg2),void **arg, int *ret, int count);
2757 //FIXME func typedef
2758
2759 /**
2760 * Initializes the AVCodecContext to use the given AVCodec. Prior to using this
2761 * function the context has to be allocated.
2762 *
2763 * The functions avcodec_find_decoder_by_name(), avcodec_find_encoder_by_name(),
2764 * avcodec_find_decoder() and avcodec_find_encoder() provide an easy way for
2765 * retrieving a codec.
2766 *
2767 * @warning This function is not thread safe!
2768 *
2769 * @code
2770 * codec = avcodec_find_decoder(CODEC_ID_H264);
2771 * if (!codec)
2772 * exit(1);
2773 *
2774 * context = avcodec_alloc_context();
2775 *
2776 * if (avcodec_open(context, codec) < 0)
2777 * exit(1);
2778 * @endcode
2779 *
2780 * @param avctx The context which will be set up to use the given codec.
2781 * @param codec The codec to use within the context.
2782 * @return zero on success, a negative value on error
2783 * @see avcodec_alloc_context, avcodec_find_decoder, avcodec_find_encoder
2784 */
2785 int avcodec_open(AVCodecContext *avctx, AVCodec *codec);
2786
2787 /**
2788 * @deprecated Use avcodec_decode_audio2() instead.
2789 */
2790 attribute_deprecated int avcodec_decode_audio(AVCodecContext *avctx, int16_t *samples,
2791 int *frame_size_ptr,
2792 uint8_t *buf, int buf_size);
2793
2794 /**
2795 * Decodes an audio frame from \p buf into \p samples.
2796 * The avcodec_decode_audio2() function decodes an audio frame from the input
2797 * buffer \p buf of size \p buf_size. To decode it, it makes use of the
2798 * audio codec which was coupled with \p avctx using avcodec_open(). The
2799 * resulting decoded frame is stored in output buffer \p samples. If no frame
2800 * could be decompressed, \p frame_size_ptr is zero. Otherwise, it is the
2801 * decompressed frame size in \e bytes.
2802 *
2803 * @warning You \e must set \p frame_size_ptr to the allocated size of the
2804 * output buffer before calling avcodec_decode_audio2().
2805 *
2806 * @warning The input buffer must be \c FF_INPUT_BUFFER_PADDING_SIZE larger than
2807 * the actual read bytes because some optimized bitstream readers read 32 or 64
2808 * bits at once and could read over the end.
2809 *
2810 * @warning The end of the input buffer \p buf should be set to 0 to ensure that
2811 * no overreading happens for damaged MPEG streams.
2812 *
2813 * @note You might have to align the input buffer \p buf and output buffer \p
2814 * samples. The alignment requirements depend on the CPU: On some CPUs it isn't
2815 * necessary at all, on others it won't work at all if not aligned and on others
2816 * it will work but it will have an impact on performance. In practice, the
2817 * bitstream should have 4 byte alignment at minimum and all sample data should
2818 * be 16 byte aligned unless the CPU doesn't need it (AltiVec and SSE do). If
2819 * the linesize is not a multiple of 16 then there's no sense in aligning the
2820 * start of the buffer to 16.
2821 *
2822 * @param avctx the codec context
2823 * @param[out] samples the output buffer
2824 * @param[in,out] frame_size_ptr the output buffer size in bytes
2825 * @param[in] buf the input buffer
2826 * @param[in] buf_size the input buffer size in bytes
2827 * @return On error a negative value is returned, otherwise the number of bytes
2828 * used or zero if no frame could be decompressed.
2829 */
2830 int avcodec_decode_audio2(AVCodecContext *avctx, int16_t *samples,
2831 int *frame_size_ptr,
2832 uint8_t *buf, int buf_size);
2833
2834 /**
2835 * Decodes a video frame from \p buf into \p picture.
2836 * The avcodec_decode_video() function decodes a video frame from the input
2837 * buffer \p buf of size \p buf_size. To decode it, it makes use of the
2838 * video codec which was coupled with \p avctx using avcodec_open(). The
2839 * resulting decoded frame is stored in \p picture.
2840 *
2841 * @warning The input buffer must be \c FF_INPUT_BUFFER_PADDING_SIZE larger than
2842 * the actual read bytes because some optimized bitstream readers read 32 or 64
2843 * bits at once and could read over the end.
2844 *
2845 * @warning The end of the input buffer \p buf should be set to 0 to ensure that
2846 * no overreading happens for damaged MPEG streams.
2847 *
2848 * @note You might have to align the input buffer \p buf and output buffer \p
2849 * samples. The alignment requirements depend on the CPU: on some CPUs it isn't
2850 * necessary at all, on others it won't work at all if not aligned and on others
2851 * it will work but it will have an impact on performance. In practice, the
2852 * bitstream should have 4 byte alignment at minimum and all sample data should
2853 * be 16 byte aligned unless the CPU doesn't need it (AltiVec and SSE do). If
2854 * the linesize is not a multiple of 16 then there's no sense in aligning the
2855 * start of the buffer to 16.
2856 *
2857 * @param avctx the codec context
2858 * @param[out] picture The AVFrame in which the decoded video frame will be stored.
2859 * @param[in] buf the input buffer
2860 * @param[in] buf_size the size of the input buffer in bytes
2861 * @param[in,out] got_picture_ptr Zero if no frame could be decompressed, otherwise, it is nonzero.
2862 * @return On error a negative value is returned, otherwise the number of bytes
2863 * used or zero if no frame could be decompressed.
2864 */
2865 int avcodec_decode_video(AVCodecContext *avctx, AVFrame *picture,
2866 int *got_picture_ptr,
2867 uint8_t *buf, int buf_size);
2868
2869 /* Decode a subtitle message. Return -1 if error, otherwise return the
2870 * number of bytes used. If no subtitle could be decompressed,
2871 * got_sub_ptr is zero. Otherwise, the subtitle is stored in *sub. */
2872 int avcodec_decode_subtitle(AVCodecContext *avctx, AVSubtitle *sub,
2873 int *got_sub_ptr,
2874 const uint8_t *buf, int buf_size);
2875 int avcodec_parse_frame(AVCodecContext *avctx, uint8_t **pdata,
2876 int *data_size_ptr,
2877 uint8_t *buf, int buf_size);
2878
2879 /**
2880 * Encodes an audio frame from \p samples into \p buf.
2881 * The avcodec_encode_audio() function encodes an audio frame from the input
2882 * buffer \p samples. To encode it, it makes use of the audio codec which was
2883 * coupled with \p avctx using avcodec_open(). The resulting encoded frame is
2884 * stored in output buffer \p buf.
2885 *
2886 * @note The output buffer should be at least \c FF_MIN_BUFFER_SIZE bytes large.
2887 *
2888 * @param avctx the codec context
2889 * @param[out] buf the output buffer
2890 * @param[in] buf_size the output buffer size
2891 * @param[in] samples the input buffer containing the samples
2892 * @return On error a negative value is returned, on succes zero or the number
2893 * of bytes used from the input buffer.
2894 */
2895 int avcodec_encode_audio(AVCodecContext *avctx, uint8_t *buf, int buf_size,
2896 const short *samples);
2897
2898 /**
2899 * Encodes a video frame from \p pict into \p buf.
2900 * The avcodec_encode_video() function encodes a video frame from the input
2901 * \p pict. To encode it, it makes use of the video codec which was coupled with
2902 * \p avctx using avcodec_open(). The resulting encoded bytes representing the
2903 * frame are stored in the output buffer \p buf. The input picture should be
2904 * stored using a specific format, namely \c avctx.pix_fmt.
2905 *
2906 * @param avctx the codec context
2907 * @param[out] buf the output buffer for the bitstream of encoded frame
2908 * @param[in] buf_size the size of the output buffer in bytes
2909 * @param[in] pict the input picture to encode
2910 * @return On error a negative value is returned, on success zero or the number
2911 * of bytes used from the input buffer.
2912 */
2913 int avcodec_encode_video(AVCodecContext *avctx, uint8_t *buf, int buf_size,
2914 const AVFrame *pict);
2915 int avcodec_encode_subtitle(AVCodecContext *avctx, uint8_t *buf, int buf_size,
2916 const AVSubtitle *sub);
2917
2918 int avcodec_close(AVCodecContext *avctx);
2919
2920 void avcodec_register_all(void);
2921
2922 /**
2923 * Flush buffers, should be called when seeking or when switching to a different stream.
2924 */
2925 void avcodec_flush_buffers(AVCodecContext *avctx);
2926
2927 void avcodec_default_free_buffers(AVCodecContext *s);
2928
2929 /* misc useful functions */
2930
2931 /**
2932 * Returns a single letter to describe the given picture type \p pict_type.
2933 *
2934 * @param[in] pict_type the picture type
2935 * @return A single character representing the picture type.
2936 */
2937 char av_get_pict_type_char(int pict_type);
2938
2939 /**
2940 * Returns codec bits per sample.
2941 *
2942 * @param[in] codec_id the codec
2943 * @return Number of bits per sample or zero if unknown for the given codec.
2944 */
2945 int av_get_bits_per_sample(enum CodecID codec_id);
2946
2947 /* frame parsing */
2948 typedef struct AVCodecParserContext {
2949 void *priv_data;
2950 struct AVCodecParser *parser;
2951 int64_t frame_offset; /* offset of the current frame */
2952 int64_t cur_offset; /* current offset
2953 (incremented by each av_parser_parse()) */
2954 int64_t last_frame_offset; /* offset of the last frame */
2955 /* video info */
2956 int pict_type; /* XXX: Put it back in AVCodecContext. */
2957 int repeat_pict; /* XXX: Put it back in AVCodecContext. */
2958 int64_t pts; /* pts of the current frame */
2959 int64_t dts; /* dts of the current frame */
2960
2961 /* private data */
2962 int64_t last_pts;
2963 int64_t last_dts;
2964 int fetch_timestamp;
2965
2966 #define AV_PARSER_PTS_NB 4
2967 int cur_frame_start_index;
2968 int64_t cur_frame_offset[AV_PARSER_PTS_NB];
2969 int64_t cur_frame_pts[AV_PARSER_PTS_NB];
2970 int64_t cur_frame_dts[AV_PARSER_PTS_NB];
2971
2972 int flags;
2973 #define PARSER_FLAG_COMPLETE_FRAMES 0x0001
2974
2975 int64_t offset; ///< byte offset from starting packet start
2976 int64_t last_offset;
2977 } AVCodecParserContext;
2978
2979 typedef struct AVCodecParser {
2980 int codec_ids[5]; /* several codec IDs are permitted */
2981 int priv_data_size;
2982 int (*parser_init)(AVCodecParserContext *s);
2983 int (*parser_parse)(AVCodecParserContext *s,
2984 AVCodecContext *avctx,
2985 const uint8_t **poutbuf, int *poutbuf_size,
2986 const uint8_t *buf, int buf_size);
2987 void (*parser_close)(AVCodecParserContext *s);
2988 int (*split)(AVCodecContext *avctx, const uint8_t *buf, int buf_size);
2989 struct AVCodecParser *next;
2990 } AVCodecParser;
2991
2992 extern AVCodecParser *av_first_parser;
2993
2994 void av_register_codec_parser(AVCodecParser *parser);
2995 AVCodecParserContext *av_parser_init(int codec_id);
2996 int av_parser_parse(AVCodecParserContext *s,
2997 AVCodecContext *avctx,
2998 uint8_t **poutbuf, int *poutbuf_size,
2999 const uint8_t *buf, int buf_size,
3000 int64_t pts, int64_t dts);
3001 int av_parser_change(AVCodecParserContext *s,
3002 AVCodecContext *avctx,
3003 uint8_t **poutbuf, int *poutbuf_size,
3004 const uint8_t *buf, int buf_size, int keyframe);
3005 void av_parser_close(AVCodecParserContext *s);
3006
3007 extern AVCodecParser aac_parser;
3008 extern AVCodecParser ac3_parser;
3009 extern AVCodecParser cavsvideo_parser;
3010 extern AVCodecParser dca_parser;
3011 extern AVCodecParser dvbsub_parser;
3012 extern AVCodecParser dvdsub_parser;
3013 extern AVCodecParser h261_parser;
3014 extern AVCodecParser h263_parser;
3015 extern AVCodecParser h264_parser;
3016 extern AVCodecParser mjpeg_parser;
3017 extern AVCodecParser mpeg4video_parser;
3018 extern AVCodecParser mpegaudio_parser;
3019 extern AVCodecParser mpegvideo_parser;
3020 extern AVCodecParser pnm_parser;
3021 extern AVCodecParser vc1_parser;
3022
3023
3024 typedef struct AVBitStreamFilterContext {
3025 void *priv_data;
3026 struct AVBitStreamFilter *filter;
3027 AVCodecParserContext *parser;
3028 struct AVBitStreamFilterContext *next;
3029 } AVBitStreamFilterContext;
3030
3031
3032 typedef struct AVBitStreamFilter {
3033 const char *name;
3034 int priv_data_size;
3035 int (*filter)(AVBitStreamFilterContext *bsfc,
3036 AVCodecContext *avctx, const char *args,
3037 uint8_t **poutbuf, int *poutbuf_size,
3038 const uint8_t *buf, int buf_size, int keyframe);
3039 struct AVBitStreamFilter *next;
3040 } AVBitStreamFilter;
3041
3042 extern AVBitStreamFilter *av_first_bitstream_filter;
3043
3044 void av_register_bitstream_filter(AVBitStreamFilter *bsf);
3045 AVBitStreamFilterContext *av_bitstream_filter_init(const char *name);
3046 int av_bitstream_filter_filter(AVBitStreamFilterContext *bsfc,
3047 AVCodecContext *avctx, const char *args,
3048 uint8_t **poutbuf, int *poutbuf_size,
3049 const uint8_t *buf, int buf_size, int keyframe);
3050 void av_bitstream_filter_close(AVBitStreamFilterContext *bsf);
3051
3052 extern AVBitStreamFilter dump_extradata_bsf;
3053 extern AVBitStreamFilter remove_extradata_bsf;
3054 extern AVBitStreamFilter noise_bsf;
3055 extern AVBitStreamFilter mp3_header_compress_bsf;
3056 extern AVBitStreamFilter mp3_header_decompress_bsf;
3057 extern AVBitStreamFilter mjpega_dump_header_bsf;
3058 extern AVBitStreamFilter imx_dump_header_bsf;
3059
3060
3061 /* memory */
3062
3063 /**
3064 * Reallocates the given block if it is not large enough, otherwise it
3065 * does nothing.
3066 *
3067 * @see av_realloc
3068 */
3069 void *av_fast_realloc(void *ptr, unsigned int *size, unsigned int min_size);
3070
3071 /* for static data only */
3072
3073 /**
3074 * Frees all static arrays and resets their pointers to 0.
3075 * Call this function to release all statically allocated tables.
3076 *
3077 * @deprecated. Code which uses av_free_static is broken/missdesigned
3078 * and should correctly use static arrays
3079 *
3080 */
3081 attribute_deprecated void av_free_static(void);
3082
3083 /**
3084 * Allocation of static arrays.
3085 *
3086 * @warning Do not use for normal allocation.
3087 *
3088 * @param[in] size The amount of memory you need in bytes.
3089 * @return block of memory of the requested size
3090 * @deprecated. Code which uses av_mallocz_static is broken/missdesigned
3091 * and should correctly use static arrays
3092 */
3093 attribute_deprecated void *av_mallocz_static(unsigned int size);
3094
3095 /**
3096 * Copy image 'src' to 'dst'.
3097 */
3098 void av_picture_copy(AVPicture *dst, const AVPicture *src,
3099 int pix_fmt, int width, int height);
3100
3101 /**
3102 * Crop image top and left side.
3103 */
3104 int av_picture_crop(AVPicture *dst, const AVPicture *src,
3105 int pix_fmt, int top_band, int left_band);
3106
3107 /**
3108 * Pad image.
3109 */
3110 int av_picture_pad(AVPicture *dst, const AVPicture *src, int height, int width, int pix_fmt,
3111 int padtop, int padbottom, int padleft, int padright, int *color);
3112
3113 #if LIBAVCODEC_VERSION_INT < ((52<<16)+(0<<8)+0)
3114 /**
3115 * @deprecated Use the software scaler (swscale) instead.
3116 */
3117 attribute_deprecated void img_copy(AVPicture *dst, const AVPicture *src,
3118 int pix_fmt, int width, int height);
3119
3120 /**
3121 * @deprecated Use the software scaler (swscale) instead.
3122 */
3123 attribute_deprecated int img_crop(AVPicture *dst, const AVPicture *src,
3124 int pix_fmt, int top_band, int left_band);
3125
3126 /**
3127 * @deprecated Use the software scaler (swscale) instead.
3128 */
3129 attribute_deprecated int img_pad(AVPicture *dst, const AVPicture *src, int height, int width, int pix_fmt,
3130 int padtop, int padbottom, int padleft, int padright, int *color);
3131 #endif
3132
3133 extern unsigned int av_xiphlacing(unsigned char *s, unsigned int v);
3134
3135 /* error handling */
3136 #if EINVAL > 0
3137 #define AVERROR(e) (-(e)) /**< Returns a negative error code from a POSIX error code, to return from library functions. */
3138 #define AVUNERROR(e) (-(e)) /**< Returns a POSIX error code from a library function error return value. */
3139 #else
3140 /* Some platforms have E* and errno already negated. */
3141 #define AVERROR(e) (e)
3142 #define AVUNERROR(e) (e)
3143 #endif
3144 #define AVERROR_UNKNOWN AVERROR(EINVAL) /**< unknown error */
3145 #define AVERROR_IO AVERROR(EIO) /**< I/O error */
3146 #define AVERROR_NUMEXPECTED AVERROR(EDOM) /**< Number syntax expected in filename. */
3147 #define AVERROR_INVALIDDATA AVERROR(EINVAL) /**< invalid data found */
3148 #define AVERROR_NOMEM AVERROR(ENOMEM) /**< not enough memory */
3149 #define AVERROR_NOFMT AVERROR(EILSEQ) /**< unknown format */
3150 #define AVERROR_NOTSUPP AVERROR(ENOSYS) /**< Operation not supported. */
3151
3152 #ifdef __cplusplus
3153 }
3154 #endif
3155
3156 #endif /* AVCODEC_H */