2 * copyright (c) 2001 Fabrice Bellard
4 * This file is part of FFmpeg.
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.
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.
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with FFmpeg; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21 #ifndef AVCODEC_AVCODEC_H
22 #define AVCODEC_AVCODEC_H
30 #include "libavutil/samplefmt.h"
31 #include "libavutil/avutil.h"
32 #include "libavutil/cpu.h"
33 #include "libavutil/channel_layout.h"
34 #include "libavutil/dict.h"
35 #include "libavutil/log.h"
36 #include "libavutil/pixfmt.h"
37 #include "libavutil/rational.h"
39 #include "libavcodec/version.h"
41 * @defgroup libavc Encoding/Decoding Library
44 * @defgroup lavc_decoding Decoding
48 * @defgroup lavc_encoding Encoding
52 * @defgroup lavc_codec Codecs
54 * @defgroup lavc_codec_native Native Codecs
57 * @defgroup lavc_codec_wrappers External library wrappers
60 * @defgroup lavc_codec_hwaccel Hardware Accelerators bridge
64 * @defgroup lavc_internal Internal
72 * @defgroup lavc_core Core functions/structures.
75 * Basic definitions, functions for querying libavcodec capabilities,
76 * allocating core structures, etc.
82 * Identify the syntax and semantics of the bitstream.
83 * The principle is roughly:
84 * Two decoders with the same ID can decode the same streams.
85 * Two encoders with the same ID can encode compatible streams.
86 * There may be slight deviations from the principle due to implementation
89 * If you add a codec ID to this list, add it so that
90 * 1. no value of a existing codec ID changes (that would break ABI),
91 * 2. Give it a value which when taken as ASCII is recognized uniquely by a human as this specific codec.
92 * This ensures that 2 forks can independently add AVCodecIDs without producing conflicts.
94 * After adding new codec IDs, do not forget to add an entry to the codec
95 * descriptor list and bump libavcodec minor version.
101 AV_CODEC_ID_MPEG1VIDEO,
102 AV_CODEC_ID_MPEG2VIDEO, ///< preferred ID for MPEG-1/2 video decoding
103 AV_CODEC_ID_MPEG2VIDEO_XVMC,
114 AV_CODEC_ID_RAWVIDEO,
115 AV_CODEC_ID_MSMPEG4V1,
116 AV_CODEC_ID_MSMPEG4V2,
117 AV_CODEC_ID_MSMPEG4V3,
140 AV_CODEC_ID_INTERPLAY_VIDEO,
147 AV_CODEC_ID_MSVIDEO1,
152 AV_CODEC_ID_TRUEMOTION1,
153 AV_CODEC_ID_VMDVIDEO,
179 AV_CODEC_ID_TRUEMOTION2,
185 AV_CODEC_ID_SMACKVIDEO,
190 AV_CODEC_ID_JPEG2000,
196 AV_CODEC_ID_DSICINVIDEO,
197 AV_CODEC_ID_TIERTEXSEQVIDEO,
205 AV_CODEC_ID_BETHSOFTVID,
217 AV_CODEC_ID_ESCAPE124,
221 AV_CODEC_ID_MOTIONPIXELS,
233 AV_CODEC_ID_FLASHSV2,
234 AV_CODEC_ID_CDGRAPHICS,
237 AV_CODEC_ID_BINKVIDEO,
238 AV_CODEC_ID_IFF_ILBM,
239 AV_CODEC_ID_IFF_BYTERUN1,
245 AV_CODEC_ID_A64_MULTI,
246 AV_CODEC_ID_A64_MULTI5,
249 AV_CODEC_ID_LAGARITH,
253 AV_CODEC_ID_WMV3IMAGE,
254 AV_CODEC_ID_VC1IMAGE,
256 AV_CODEC_ID_BMV_VIDEO,
263 AV_CODEC_ID_ZEROCODEC,
270 AV_CODEC_ID_BRENDER_PIX= MKBETAG('B','P','I','X'),
271 AV_CODEC_ID_Y41P = MKBETAG('Y','4','1','P'),
272 AV_CODEC_ID_ESCAPE130 = MKBETAG('E','1','3','0'),
273 AV_CODEC_ID_EXR = MKBETAG('0','E','X','R'),
274 AV_CODEC_ID_AVRP = MKBETAG('A','V','R','P'),
276 AV_CODEC_ID_G2M = MKBETAG( 0 ,'G','2','M'),
277 AV_CODEC_ID_AVUI = MKBETAG('A','V','U','I'),
278 AV_CODEC_ID_AYUV = MKBETAG('A','Y','U','V'),
279 AV_CODEC_ID_TARGA_Y216 = MKBETAG('T','2','1','6'),
280 AV_CODEC_ID_V308 = MKBETAG('V','3','0','8'),
281 AV_CODEC_ID_V408 = MKBETAG('V','4','0','8'),
282 AV_CODEC_ID_YUV4 = MKBETAG('Y','U','V','4'),
283 AV_CODEC_ID_SANM = MKBETAG('S','A','N','M'),
284 AV_CODEC_ID_PAF_VIDEO = MKBETAG('P','A','F','V'),
285 AV_CODEC_ID_AVRN = MKBETAG('A','V','R','n'),
286 AV_CODEC_ID_CPIA = MKBETAG('C','P','I','A'),
287 AV_CODEC_ID_XFACE = MKBETAG('X','F','A','C'),
288 AV_CODEC_ID_SGIRLE = MKBETAG('S','G','I','R'),
289 AV_CODEC_ID_MVC1 = MKBETAG('M','V','C','1'),
290 AV_CODEC_ID_MVC2 = MKBETAG('M','V','C','2'),
292 /* various PCM "codecs" */
293 AV_CODEC_ID_FIRST_AUDIO = 0x10000, ///< A dummy id pointing at the start of audio codecs
294 AV_CODEC_ID_PCM_S16LE = 0x10000,
295 AV_CODEC_ID_PCM_S16BE,
296 AV_CODEC_ID_PCM_U16LE,
297 AV_CODEC_ID_PCM_U16BE,
300 AV_CODEC_ID_PCM_MULAW,
301 AV_CODEC_ID_PCM_ALAW,
302 AV_CODEC_ID_PCM_S32LE,
303 AV_CODEC_ID_PCM_S32BE,
304 AV_CODEC_ID_PCM_U32LE,
305 AV_CODEC_ID_PCM_U32BE,
306 AV_CODEC_ID_PCM_S24LE,
307 AV_CODEC_ID_PCM_S24BE,
308 AV_CODEC_ID_PCM_U24LE,
309 AV_CODEC_ID_PCM_U24BE,
310 AV_CODEC_ID_PCM_S24DAUD,
311 AV_CODEC_ID_PCM_ZORK,
312 AV_CODEC_ID_PCM_S16LE_PLANAR,
314 AV_CODEC_ID_PCM_F32BE,
315 AV_CODEC_ID_PCM_F32LE,
316 AV_CODEC_ID_PCM_F64BE,
317 AV_CODEC_ID_PCM_F64LE,
318 AV_CODEC_ID_PCM_BLURAY,
321 AV_CODEC_ID_PCM_S8_PLANAR,
322 AV_CODEC_ID_PCM_S24LE_PLANAR = MKBETAG(24,'P','S','P'),
323 AV_CODEC_ID_PCM_S32LE_PLANAR = MKBETAG(32,'P','S','P'),
324 AV_CODEC_ID_PCM_S16BE_PLANAR = MKBETAG('P','S','P',16),
326 /* various ADPCM codecs */
327 AV_CODEC_ID_ADPCM_IMA_QT = 0x11000,
328 AV_CODEC_ID_ADPCM_IMA_WAV,
329 AV_CODEC_ID_ADPCM_IMA_DK3,
330 AV_CODEC_ID_ADPCM_IMA_DK4,
331 AV_CODEC_ID_ADPCM_IMA_WS,
332 AV_CODEC_ID_ADPCM_IMA_SMJPEG,
333 AV_CODEC_ID_ADPCM_MS,
334 AV_CODEC_ID_ADPCM_4XM,
335 AV_CODEC_ID_ADPCM_XA,
336 AV_CODEC_ID_ADPCM_ADX,
337 AV_CODEC_ID_ADPCM_EA,
338 AV_CODEC_ID_ADPCM_G726,
339 AV_CODEC_ID_ADPCM_CT,
340 AV_CODEC_ID_ADPCM_SWF,
341 AV_CODEC_ID_ADPCM_YAMAHA,
342 AV_CODEC_ID_ADPCM_SBPRO_4,
343 AV_CODEC_ID_ADPCM_SBPRO_3,
344 AV_CODEC_ID_ADPCM_SBPRO_2,
345 AV_CODEC_ID_ADPCM_THP,
346 AV_CODEC_ID_ADPCM_IMA_AMV,
347 AV_CODEC_ID_ADPCM_EA_R1,
348 AV_CODEC_ID_ADPCM_EA_R3,
349 AV_CODEC_ID_ADPCM_EA_R2,
350 AV_CODEC_ID_ADPCM_IMA_EA_SEAD,
351 AV_CODEC_ID_ADPCM_IMA_EA_EACS,
352 AV_CODEC_ID_ADPCM_EA_XAS,
353 AV_CODEC_ID_ADPCM_EA_MAXIS_XA,
354 AV_CODEC_ID_ADPCM_IMA_ISS,
355 AV_CODEC_ID_ADPCM_G722,
356 AV_CODEC_ID_ADPCM_IMA_APC,
357 AV_CODEC_ID_VIMA = MKBETAG('V','I','M','A'),
358 AV_CODEC_ID_ADPCM_AFC = MKBETAG('A','F','C',' '),
359 AV_CODEC_ID_ADPCM_IMA_OKI = MKBETAG('O','K','I',' '),
362 AV_CODEC_ID_AMR_NB = 0x12000,
365 /* RealAudio codecs*/
366 AV_CODEC_ID_RA_144 = 0x13000,
369 /* various DPCM codecs */
370 AV_CODEC_ID_ROQ_DPCM = 0x14000,
371 AV_CODEC_ID_INTERPLAY_DPCM,
372 AV_CODEC_ID_XAN_DPCM,
373 AV_CODEC_ID_SOL_DPCM,
376 AV_CODEC_ID_MP2 = 0x15000,
377 AV_CODEC_ID_MP3, ///< preferred ID for decoding MPEG audio layer 1, 2 or 3
387 AV_CODEC_ID_VMDAUDIO,
393 AV_CODEC_ID_WESTWOOD_SND1,
394 AV_CODEC_ID_GSM, ///< as in Berlin toast format
397 AV_CODEC_ID_TRUESPEECH,
399 AV_CODEC_ID_SMACKAUDIO,
402 AV_CODEC_ID_DSICINAUDIO,
404 AV_CODEC_ID_MUSEPACK7,
406 AV_CODEC_ID_GSM_MS, /* as found in WAV */
410 AV_CODEC_ID_NELLYMOSER,
411 AV_CODEC_ID_MUSEPACK8,
413 AV_CODEC_ID_WMAVOICE,
415 AV_CODEC_ID_WMALOSSLESS,
424 AV_CODEC_ID_BINKAUDIO_RDFT,
425 AV_CODEC_ID_BINKAUDIO_DCT,
426 AV_CODEC_ID_AAC_LATM,
431 AV_CODEC_ID_8SVX_EXP,
432 AV_CODEC_ID_8SVX_FIB,
433 AV_CODEC_ID_BMV_AUDIO,
437 AV_CODEC_ID_OPUS_DEPRECATED,
438 AV_CODEC_ID_COMFORT_NOISE,
439 AV_CODEC_ID_TAK_DEPRECATED,
440 AV_CODEC_ID_FFWAVESYNTH = MKBETAG('F','F','W','S'),
441 #if LIBAVCODEC_VERSION_MAJOR <= 54
442 AV_CODEC_ID_8SVX_RAW = MKBETAG('8','S','V','X'),
444 AV_CODEC_ID_SONIC = MKBETAG('S','O','N','C'),
445 AV_CODEC_ID_SONIC_LS = MKBETAG('S','O','N','L'),
446 AV_CODEC_ID_PAF_AUDIO = MKBETAG('P','A','F','A'),
447 AV_CODEC_ID_OPUS = MKBETAG('O','P','U','S'),
448 AV_CODEC_ID_TAK = MKBETAG('t','B','a','K'),
450 /* subtitle codecs */
451 AV_CODEC_ID_FIRST_SUBTITLE = 0x17000, ///< A dummy ID pointing at the start of subtitle codecs.
452 AV_CODEC_ID_DVD_SUBTITLE = 0x17000,
453 AV_CODEC_ID_DVB_SUBTITLE,
454 AV_CODEC_ID_TEXT, ///< raw UTF-8 text
457 AV_CODEC_ID_MOV_TEXT,
458 AV_CODEC_ID_HDMV_PGS_SUBTITLE,
459 AV_CODEC_ID_DVB_TELETEXT,
461 AV_CODEC_ID_MICRODVD = MKBETAG('m','D','V','D'),
462 AV_CODEC_ID_EIA_608 = MKBETAG('c','6','0','8'),
463 AV_CODEC_ID_JACOSUB = MKBETAG('J','S','U','B'),
464 AV_CODEC_ID_SAMI = MKBETAG('S','A','M','I'),
465 AV_CODEC_ID_REALTEXT = MKBETAG('R','T','X','T'),
466 AV_CODEC_ID_SUBVIEWER = MKBETAG('S','u','b','V'),
467 AV_CODEC_ID_SUBRIP = MKBETAG('S','R','i','p'),
468 AV_CODEC_ID_WEBVTT = MKBETAG('W','V','T','T'),
470 /* other specific kind of codecs (generally used for attachments) */
471 AV_CODEC_ID_FIRST_UNKNOWN = 0x18000, ///< A dummy ID pointing at the start of various fake codecs.
472 AV_CODEC_ID_TTF = 0x18000,
473 AV_CODEC_ID_BINTEXT = MKBETAG('B','T','X','T'),
474 AV_CODEC_ID_XBIN = MKBETAG('X','B','I','N'),
475 AV_CODEC_ID_IDF = MKBETAG( 0 ,'I','D','F'),
476 AV_CODEC_ID_OTF = MKBETAG( 0 ,'O','T','F'),
477 AV_CODEC_ID_SMPTE_KLV = MKBETAG('K','L','V','A'),
479 AV_CODEC_ID_PROBE = 0x19000, ///< codec_id is not known (like AV_CODEC_ID_NONE) but lavf should attempt to identify it
481 AV_CODEC_ID_MPEG2TS = 0x20000, /**< _FAKE_ codec to indicate a raw MPEG-2 TS
482 * stream (only used by libavformat) */
483 AV_CODEC_ID_MPEG4SYSTEMS = 0x20001, /**< _FAKE_ codec to indicate a MPEG-4 Systems
484 * stream (only used by libavformat) */
485 AV_CODEC_ID_FFMETADATA = 0x21000, ///< Dummy codec for streams containing only metadata information.
488 #include "old_codec_ids.h"
493 #define CodecID AVCodecID
497 * This struct describes the properties of a single codec described by an
499 * @see avcodec_get_descriptor()
501 typedef struct AVCodecDescriptor {
503 enum AVMediaType type;
505 * Name of the codec described by this descriptor. It is non-empty and
506 * unique for each codec descriptor. It should contain alphanumeric
507 * characters and '_' only.
511 * A more descriptive name for this codec. May be NULL.
513 const char *long_name;
515 * Codec properties, a combination of AV_CODEC_PROP_* flags.
521 * Codec uses only intra compression.
524 #define AV_CODEC_PROP_INTRA_ONLY (1 << 0)
526 * Codec supports lossy compression. Audio and video codecs only.
527 * @note a codec may support both lossy and lossless
530 #define AV_CODEC_PROP_LOSSY (1 << 1)
532 * Codec supports lossless compression. Audio and video codecs only.
534 #define AV_CODEC_PROP_LOSSLESS (1 << 2)
536 #if FF_API_OLD_DECODE_AUDIO
538 #define AVCODEC_MAX_AUDIO_FRAME_SIZE 192000 // 1 second of 48khz 32bit audio
542 * @ingroup lavc_decoding
543 * Required number of additionally allocated bytes at the end of the input bitstream for decoding.
544 * This is mainly needed because some optimized bitstream readers read
545 * 32 or 64 bit at once and could read over the end.<br>
546 * Note: If the first 23 bits of the additional bytes are not 0, then damaged
547 * MPEG bitstreams could cause overread and segfault.
549 #define FF_INPUT_BUFFER_PADDING_SIZE 16
552 * @ingroup lavc_encoding
553 * minimum encoding buffer size
554 * Used to avoid some checks during header writing.
556 #define FF_MIN_BUFFER_SIZE 16384
560 * @ingroup lavc_encoding
561 * motion estimation type.
564 ME_ZERO = 1, ///< no search, that is use 0,0 vector whenever one is needed
568 ME_EPZS, ///< enhanced predictive zonal search
569 ME_X1, ///< reserved for experiments
570 ME_HEX, ///< hexagon based search
571 ME_UMH, ///< uneven multi-hexagon search
572 ME_ITER, ///< iterative search
573 ME_TESA, ///< transformed exhaustive search algorithm
577 * @ingroup lavc_decoding
580 /* We leave some space between them for extensions (drop some
581 * keyframes for intra-only or drop just some bidir frames). */
582 AVDISCARD_NONE =-16, ///< discard nothing
583 AVDISCARD_DEFAULT = 0, ///< discard useless packets like 0 size packets in avi
584 AVDISCARD_NONREF = 8, ///< discard all non reference
585 AVDISCARD_BIDIR = 16, ///< discard all bidirectional frames
586 AVDISCARD_NONKEY = 32, ///< discard all frames except keyframes
587 AVDISCARD_ALL = 48, ///< discard all
590 enum AVColorPrimaries{
591 AVCOL_PRI_BT709 = 1, ///< also ITU-R BT1361 / IEC 61966-2-4 / SMPTE RP177 Annex B
592 AVCOL_PRI_UNSPECIFIED = 2,
593 AVCOL_PRI_BT470M = 4,
594 AVCOL_PRI_BT470BG = 5, ///< also ITU-R BT601-6 625 / ITU-R BT1358 625 / ITU-R BT1700 625 PAL & SECAM
595 AVCOL_PRI_SMPTE170M = 6, ///< also ITU-R BT601-6 525 / ITU-R BT1358 525 / ITU-R BT1700 NTSC
596 AVCOL_PRI_SMPTE240M = 7, ///< functionally identical to above
598 AVCOL_PRI_NB , ///< Not part of ABI
601 enum AVColorTransferCharacteristic{
602 AVCOL_TRC_BT709 = 1, ///< also ITU-R BT1361
603 AVCOL_TRC_UNSPECIFIED = 2,
604 AVCOL_TRC_GAMMA22 = 4, ///< also ITU-R BT470M / ITU-R BT1700 625 PAL & SECAM
605 AVCOL_TRC_GAMMA28 = 5, ///< also ITU-R BT470BG
606 AVCOL_TRC_SMPTE240M = 7,
607 AVCOL_TRC_NB , ///< Not part of ABI
612 AVCOL_SPC_BT709 = 1, ///< also ITU-R BT1361 / IEC 61966-2-4 xvYCC709 / SMPTE RP177 Annex B
613 AVCOL_SPC_UNSPECIFIED = 2,
615 AVCOL_SPC_BT470BG = 5, ///< also ITU-R BT601-6 625 / ITU-R BT1358 625 / ITU-R BT1700 625 PAL & SECAM / IEC 61966-2-4 xvYCC601
616 AVCOL_SPC_SMPTE170M = 6, ///< also ITU-R BT601-6 525 / ITU-R BT1358 525 / ITU-R BT1700 NTSC / functionally identical to above
617 AVCOL_SPC_SMPTE240M = 7,
618 AVCOL_SPC_YCOCG = 8, ///< Used by Dirac / VC-2 and H.264 FRext, see ITU-T SG16
619 AVCOL_SPC_NB , ///< Not part of ABI
621 #define AVCOL_SPC_YCGCO AVCOL_SPC_YCOCG
624 AVCOL_RANGE_UNSPECIFIED = 0,
625 AVCOL_RANGE_MPEG = 1, ///< the normal 219*2^(n-8) "MPEG" YUV ranges
626 AVCOL_RANGE_JPEG = 2, ///< the normal 2^n-1 "JPEG" YUV ranges
627 AVCOL_RANGE_NB , ///< Not part of ABI
631 * X X 3 4 X X are luma samples,
632 * 1 2 1-6 are possible chroma positions
633 * X X 5 6 X 0 is undefined/unknown position
635 enum AVChromaLocation{
636 AVCHROMA_LOC_UNSPECIFIED = 0,
637 AVCHROMA_LOC_LEFT = 1, ///< mpeg2/4, h264 default
638 AVCHROMA_LOC_CENTER = 2, ///< mpeg1, jpeg, h263
639 AVCHROMA_LOC_TOPLEFT = 3, ///< DV
640 AVCHROMA_LOC_TOP = 4,
641 AVCHROMA_LOC_BOTTOMLEFT = 5,
642 AVCHROMA_LOC_BOTTOM = 6,
643 AVCHROMA_LOC_NB , ///< Not part of ABI
646 enum AVAudioServiceType {
647 AV_AUDIO_SERVICE_TYPE_MAIN = 0,
648 AV_AUDIO_SERVICE_TYPE_EFFECTS = 1,
649 AV_AUDIO_SERVICE_TYPE_VISUALLY_IMPAIRED = 2,
650 AV_AUDIO_SERVICE_TYPE_HEARING_IMPAIRED = 3,
651 AV_AUDIO_SERVICE_TYPE_DIALOGUE = 4,
652 AV_AUDIO_SERVICE_TYPE_COMMENTARY = 5,
653 AV_AUDIO_SERVICE_TYPE_EMERGENCY = 6,
654 AV_AUDIO_SERVICE_TYPE_VOICE_OVER = 7,
655 AV_AUDIO_SERVICE_TYPE_KARAOKE = 8,
656 AV_AUDIO_SERVICE_TYPE_NB , ///< Not part of ABI
660 * @ingroup lavc_encoding
662 typedef struct RcOverride{
665 int qscale; // If this is 0 then quality_factor will be used instead.
666 float quality_factor;
669 #define FF_MAX_B_FRAMES 16
672 These flags can be passed in AVCodecContext.flags before initialization.
673 Note: Not everything is supported yet.
676 #define CODEC_FLAG_QSCALE 0x0002 ///< Use fixed qscale.
677 #define CODEC_FLAG_4MV 0x0004 ///< 4 MV per MB allowed / advanced prediction for H.263.
678 #define CODEC_FLAG_QPEL 0x0010 ///< Use qpel MC.
679 #define CODEC_FLAG_GMC 0x0020 ///< Use GMC.
680 #define CODEC_FLAG_MV0 0x0040 ///< Always try a MB with MV=<0,0>.
682 * The parent program guarantees that the input for B-frames containing
683 * streams is not written to for at least s->max_b_frames+1 frames, if
684 * this is not set the input will be copied.
686 #define CODEC_FLAG_INPUT_PRESERVED 0x0100
687 #define CODEC_FLAG_PASS1 0x0200 ///< Use internal 2pass ratecontrol in first pass mode.
688 #define CODEC_FLAG_PASS2 0x0400 ///< Use internal 2pass ratecontrol in second pass mode.
689 #define CODEC_FLAG_GRAY 0x2000 ///< Only decode/encode grayscale.
690 #define CODEC_FLAG_EMU_EDGE 0x4000 ///< Don't draw edges.
691 #define CODEC_FLAG_PSNR 0x8000 ///< error[?] variables will be set during encoding.
692 #define CODEC_FLAG_TRUNCATED 0x00010000 /** Input bitstream might be truncated at a random
693 location instead of only at frame boundaries. */
694 #define CODEC_FLAG_NORMALIZE_AQP 0x00020000 ///< Normalize adaptive quantization.
695 #define CODEC_FLAG_INTERLACED_DCT 0x00040000 ///< Use interlaced DCT.
696 #define CODEC_FLAG_LOW_DELAY 0x00080000 ///< Force low delay.
697 #define CODEC_FLAG_GLOBAL_HEADER 0x00400000 ///< Place global headers in extradata instead of every keyframe.
698 #define CODEC_FLAG_BITEXACT 0x00800000 ///< Use only bitexact stuff (except (I)DCT).
699 /* Fx : Flag for h263+ extra options */
700 #define CODEC_FLAG_AC_PRED 0x01000000 ///< H.263 advanced intra coding / MPEG-4 AC prediction
701 #define CODEC_FLAG_LOOP_FILTER 0x00000800 ///< loop filter
702 #define CODEC_FLAG_INTERLACED_ME 0x20000000 ///< interlaced motion estimation
703 #define CODEC_FLAG_CLOSED_GOP 0x80000000
704 #define CODEC_FLAG2_FAST 0x00000001 ///< Allow non spec compliant speedup tricks.
705 #define CODEC_FLAG2_NO_OUTPUT 0x00000004 ///< Skip bitstream encoding.
706 #define CODEC_FLAG2_LOCAL_HEADER 0x00000008 ///< Place global headers at every keyframe instead of in extradata.
707 #define CODEC_FLAG2_DROP_FRAME_TIMECODE 0x00002000 ///< timecode is in drop frame format. DEPRECATED!!!!
708 #if FF_API_MPV_GLOBAL_OPTS
709 #define CODEC_FLAG_CBP_RD 0x04000000 ///< Use rate distortion optimization for cbp.
710 #define CODEC_FLAG_QP_RD 0x08000000 ///< Use rate distortion optimization for qp selectioon.
711 #define CODEC_FLAG2_STRICT_GOP 0x00000002 ///< Strictly enforce GOP size.
712 #define CODEC_FLAG2_SKIP_RD 0x00004000 ///< RD optimal MB level residual skipping
714 #define CODEC_FLAG2_CHUNKS 0x00008000 ///< Input bitstream might be truncated at a packet boundaries instead of only at frame boundaries.
715 #define CODEC_FLAG2_SHOW_ALL 0x00400000 ///< Show all frames before the first keyframe
717 /* Unsupported options :
718 * Syntax Arithmetic coding (SAC)
719 * Reference Picture Selection
720 * Independent Segment Decoding */
722 /* codec capabilities */
724 #define CODEC_CAP_DRAW_HORIZ_BAND 0x0001 ///< Decoder can use draw_horiz_band callback.
726 * Codec uses get_buffer() for allocating buffers and supports custom allocators.
727 * If not set, it might not use get_buffer() at all or use operations that
728 * assume the buffer was allocated by avcodec_default_get_buffer.
730 #define CODEC_CAP_DR1 0x0002
731 #define CODEC_CAP_TRUNCATED 0x0008
732 /* Codec can export data for HW decoding (XvMC). */
733 #define CODEC_CAP_HWACCEL 0x0010
735 * Encoder or decoder requires flushing with NULL input at the end in order to
736 * give the complete and correct output.
738 * NOTE: If this flag is not set, the codec is guaranteed to never be fed with
739 * with NULL data. The user can still send NULL data to the public encode
740 * or decode function, but libavcodec will not pass it along to the codec
741 * unless this flag is set.
744 * The decoder has a non-zero delay and needs to be fed with avpkt->data=NULL,
745 * avpkt->size=0 at the end to get the delayed data until the decoder no longer
749 * The encoder needs to be fed with NULL data at the end of encoding until the
750 * encoder no longer returns data.
752 * NOTE: For encoders implementing the AVCodec.encode2() function, setting this
753 * flag also means that the encoder must set the pts and duration for
754 * each output packet. If this flag is not set, the pts and duration will
755 * be determined by libavcodec from the input frame.
757 #define CODEC_CAP_DELAY 0x0020
759 * Codec can be fed a final frame with a smaller size.
760 * This can be used to prevent truncation of the last audio samples.
762 #define CODEC_CAP_SMALL_LAST_FRAME 0x0040
764 * Codec can export data for HW decoding (VDPAU).
766 #define CODEC_CAP_HWACCEL_VDPAU 0x0080
768 * Codec can output multiple frames per AVPacket
769 * Normally demuxers return one frame at a time, demuxers which do not do
770 * are connected to a parser to split what they return into proper frames.
771 * This flag is reserved to the very rare category of codecs which have a
772 * bitstream that cannot be split into frames without timeconsuming
773 * operations like full decoding. Demuxers carring such bitstreams thus
774 * may return multiple frames in a packet. This has many disadvantages like
775 * prohibiting stream copy in many cases thus it should only be considered
778 #define CODEC_CAP_SUBFRAMES 0x0100
780 * Codec is experimental and is thus avoided in favor of non experimental
783 #define CODEC_CAP_EXPERIMENTAL 0x0200
785 * Codec should fill in channel configuration and samplerate instead of container
787 #define CODEC_CAP_CHANNEL_CONF 0x0400
790 * Codec is able to deal with negative linesizes
792 #define CODEC_CAP_NEG_LINESIZES 0x0800
795 * Codec supports frame-level multithreading.
797 #define CODEC_CAP_FRAME_THREADS 0x1000
799 * Codec supports slice-based (or partition-based) multithreading.
801 #define CODEC_CAP_SLICE_THREADS 0x2000
803 * Codec supports changed parameters at any point.
805 #define CODEC_CAP_PARAM_CHANGE 0x4000
807 * Codec supports avctx->thread_count == 0 (auto).
809 #define CODEC_CAP_AUTO_THREADS 0x8000
811 * Audio encoder supports receiving a different number of samples in each call.
813 #define CODEC_CAP_VARIABLE_FRAME_SIZE 0x10000
815 * Codec is intra only.
817 #define CODEC_CAP_INTRA_ONLY 0x40000000
821 #define CODEC_CAP_LOSSLESS 0x80000000
823 //The following defines may change, don't expect compatibility if you use them.
824 #define MB_TYPE_INTRA4x4 0x0001
825 #define MB_TYPE_INTRA16x16 0x0002 //FIXME H.264-specific
826 #define MB_TYPE_INTRA_PCM 0x0004 //FIXME H.264-specific
827 #define MB_TYPE_16x16 0x0008
828 #define MB_TYPE_16x8 0x0010
829 #define MB_TYPE_8x16 0x0020
830 #define MB_TYPE_8x8 0x0040
831 #define MB_TYPE_INTERLACED 0x0080
832 #define MB_TYPE_DIRECT2 0x0100 //FIXME
833 #define MB_TYPE_ACPRED 0x0200
834 #define MB_TYPE_GMC 0x0400
835 #define MB_TYPE_SKIP 0x0800
836 #define MB_TYPE_P0L0 0x1000
837 #define MB_TYPE_P1L0 0x2000
838 #define MB_TYPE_P0L1 0x4000
839 #define MB_TYPE_P1L1 0x8000
840 #define MB_TYPE_L0 (MB_TYPE_P0L0 | MB_TYPE_P1L0)
841 #define MB_TYPE_L1 (MB_TYPE_P0L1 | MB_TYPE_P1L1)
842 #define MB_TYPE_L0L1 (MB_TYPE_L0 | MB_TYPE_L1)
843 #define MB_TYPE_QUANT 0x00010000
844 #define MB_TYPE_CBP 0x00020000
845 //Note bits 24-31 are reserved for codec specific use (h264 ref0, mpeg1 0mv, ...)
849 * This specifies the area which should be displayed.
850 * Note there may be multiple such areas for one frame.
852 typedef struct AVPanScan{
855 * - encoding: Set by user.
856 * - decoding: Set by libavcodec.
861 * width and height in 1/16 pel
862 * - encoding: Set by user.
863 * - decoding: Set by libavcodec.
869 * position of the top left corner in 1/16 pel for up to 3 fields/frames
870 * - encoding: Set by user.
871 * - decoding: Set by libavcodec.
873 int16_t position[3][2];
876 #define FF_QSCALE_TYPE_MPEG1 0
877 #define FF_QSCALE_TYPE_MPEG2 1
878 #define FF_QSCALE_TYPE_H264 2
879 #define FF_QSCALE_TYPE_VP56 3
881 #define FF_BUFFER_TYPE_INTERNAL 1
882 #define FF_BUFFER_TYPE_USER 2 ///< direct rendering buffers (image is (de)allocated by user)
883 #define FF_BUFFER_TYPE_SHARED 4 ///< Buffer from somewhere else; don't deallocate image (data/base), all other tables are not shared.
884 #define FF_BUFFER_TYPE_COPY 8 ///< Just a (modified) copy of some other buffer, don't deallocate anything.
886 #define FF_BUFFER_HINTS_VALID 0x01 // Buffer hints value is meaningful (if 0 ignore).
887 #define FF_BUFFER_HINTS_READABLE 0x02 // Codec will read from buffer.
888 #define FF_BUFFER_HINTS_PRESERVE 0x04 // User must not alter buffer content.
889 #define FF_BUFFER_HINTS_REUSABLE 0x08 // Codec will reuse the buffer (update).
892 * @defgroup lavc_packet AVPacket
894 * Types and functions for working with AVPacket.
897 enum AVPacketSideDataType {
899 AV_PKT_DATA_NEW_EXTRADATA,
902 * An AV_PKT_DATA_PARAM_CHANGE side data packet is laid out as follows:
905 * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_COUNT)
906 * s32le channel_count
907 * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_LAYOUT)
908 * u64le channel_layout
909 * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_SAMPLE_RATE)
911 * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_DIMENSIONS)
916 AV_PKT_DATA_PARAM_CHANGE,
919 * An AV_PKT_DATA_H263_MB_INFO side data packet contains a number of
920 * structures with info about macroblocks relevant to splitting the
921 * packet into smaller packets on macroblock edges (e.g. as for RFC 2190).
922 * That is, it does not necessarily contain info about all macroblocks,
923 * as long as the distance between macroblocks in the info is smaller
924 * than the target payload size.
925 * Each MB info structure is 12 bytes, and is laid out as follows:
927 * u32le bit offset from the start of the packet
928 * u8 current quantizer at the start of the macroblock
930 * u16le macroblock address within the GOB
931 * u8 horizontal MV predictor
932 * u8 vertical MV predictor
933 * u8 horizontal MV predictor for block number 3
934 * u8 vertical MV predictor for block number 3
937 AV_PKT_DATA_H263_MB_INFO,
940 * Recommmends skipping the specified number of samples
942 * u32le number of samples to skip from start of this packet
943 * u32le number of samples to skip from end of this packet
944 * u8 reason for start skip
945 * u8 reason for end skip (0=padding silence, 1=convergence)
948 AV_PKT_DATA_SKIP_SAMPLES=70,
951 * An AV_PKT_DATA_JP_DUALMONO side data packet indicates that
952 * the packet may contain "dual mono" audio specific to Japanese DTV
953 * and if it is true, recommends only the selected channel to be used.
955 * u8 selected channels (0=mail/left, 1=sub/right, 2=both)
958 AV_PKT_DATA_JP_DUALMONO,
961 * A list of zero terminated key/value strings. There is no end marker for
962 * the list, so it is required to rely on the side data size to stop.
964 AV_PKT_DATA_STRINGS_METADATA,
967 * Subtitle event position
975 AV_PKT_DATA_SUBTITLE_POSITION,
979 * This structure stores compressed data. It is typically exported by demuxers
980 * and then passed as input to decoders, or received as output from encoders and
981 * then passed to muxers.
983 * For video, it should typically contain one compressed frame. For audio it may
984 * contain several compressed frames.
986 * AVPacket is one of the few structs in FFmpeg, whose size is a part of public
987 * ABI. Thus it may be allocated on stack and no new fields can be added to it
988 * without libavcodec and libavformat major bump.
990 * The semantics of data ownership depends on the destruct field.
991 * If it is set, the packet data is dynamically allocated and is valid
992 * indefinitely until av_free_packet() is called (which in turn calls the
993 * destruct callback to free the data). If destruct is not set, the packet data
994 * is typically backed by some static buffer somewhere and is only valid for a
995 * limited time (e.g. until the next read call when demuxing).
997 * The side data is always allocated with av_malloc() and is freed in
1000 typedef struct AVPacket {
1002 * Presentation timestamp in AVStream->time_base units; the time at which
1003 * the decompressed packet will be presented to the user.
1004 * Can be AV_NOPTS_VALUE if it is not stored in the file.
1005 * pts MUST be larger or equal to dts as presentation cannot happen before
1006 * decompression, unless one wants to view hex dumps. Some formats misuse
1007 * the terms dts and pts/cts to mean something different. Such timestamps
1008 * must be converted to true pts/dts before they are stored in AVPacket.
1012 * Decompression timestamp in AVStream->time_base units; the time at which
1013 * the packet is decompressed.
1014 * Can be AV_NOPTS_VALUE if it is not stored in the file.
1021 * A combination of AV_PKT_FLAG values
1025 * Additional packet data that can be provided by the container.
1026 * Packet can contain several types of side information.
1031 enum AVPacketSideDataType type;
1033 int side_data_elems;
1036 * Duration of this packet in AVStream->time_base units, 0 if unknown.
1037 * Equals next_pts - this_pts in presentation order.
1040 void (*destruct)(struct AVPacket *);
1042 int64_t pos; ///< byte position in stream, -1 if unknown
1045 * Time difference in AVStream->time_base units from the pts of this
1046 * packet to the point at which the output from the decoder has converged
1047 * independent from the availability of previous frames. That is, the
1048 * frames are virtually identical no matter if decoding started from
1049 * the very first frame or from this keyframe.
1050 * Is AV_NOPTS_VALUE if unknown.
1051 * This field is not the display duration of the current packet.
1052 * This field has no meaning if the packet does not have AV_PKT_FLAG_KEY
1055 * The purpose of this field is to allow seeking in streams that have no
1056 * keyframes in the conventional sense. It corresponds to the
1057 * recovery point SEI in H.264 and match_time_delta in NUT. It is also
1058 * essential for some types of subtitle streams to ensure that all
1059 * subtitles are correctly displayed after seeking.
1061 int64_t convergence_duration;
1063 #define AV_PKT_FLAG_KEY 0x0001 ///< The packet contains a keyframe
1064 #define AV_PKT_FLAG_CORRUPT 0x0002 ///< The packet content is corrupted
1066 enum AVSideDataParamChangeFlags {
1067 AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_COUNT = 0x0001,
1068 AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_LAYOUT = 0x0002,
1069 AV_SIDE_DATA_PARAM_CHANGE_SAMPLE_RATE = 0x0004,
1070 AV_SIDE_DATA_PARAM_CHANGE_DIMENSIONS = 0x0008,
1077 * Audio Video Frame.
1078 * New fields can be added to the end of AVFRAME with minor version
1079 * bumps. Similarly fields that are marked as to be only accessed by
1080 * av_opt_ptr() can be reordered. This allows 2 forks to add fields
1081 * without breaking compatibility with each other.
1082 * Removal, reordering and changes in the remaining cases require
1083 * a major version bump.
1084 * sizeof(AVFrame) must not be used outside libavcodec.
1086 typedef struct AVFrame {
1087 #define AV_NUM_DATA_POINTERS 8
1089 * pointer to the picture/channel planes.
1090 * This might be different from the first allocated byte
1091 * - encoding: Set by user
1092 * - decoding: set by AVCodecContext.get_buffer()
1094 uint8_t *data[AV_NUM_DATA_POINTERS];
1097 * Size, in bytes, of the data for each picture/channel plane.
1099 * For audio, only linesize[0] may be set. For planar audio, each channel
1100 * plane must be the same size.
1102 * - encoding: Set by user
1103 * - decoding: set by AVCodecContext.get_buffer()
1105 int linesize[AV_NUM_DATA_POINTERS];
1108 * pointers to the data planes/channels.
1110 * For video, this should simply point to data[].
1112 * For planar audio, each channel has a separate data pointer, and
1113 * linesize[0] contains the size of each channel buffer.
1114 * For packed audio, there is just one data pointer, and linesize[0]
1115 * contains the total size of the buffer for all channels.
1117 * Note: Both data and extended_data will always be set by get_buffer(),
1118 * but for planar audio with more channels that can fit in data,
1119 * extended_data must be used by the decoder in order to access all
1122 * encoding: set by user
1123 * decoding: set by AVCodecContext.get_buffer()
1125 uint8_t **extended_data;
1128 * width and height of the video frame
1129 * - encoding: unused
1130 * - decoding: Read by user.
1135 * number of audio samples (per channel) described by this frame
1136 * - encoding: Set by user
1137 * - decoding: Set by libavcodec
1142 * format of the frame, -1 if unknown or unset
1143 * Values correspond to enum AVPixelFormat for video frames,
1144 * enum AVSampleFormat for audio)
1145 * - encoding: unused
1146 * - decoding: Read by user.
1151 * 1 -> keyframe, 0-> not
1152 * - encoding: Set by libavcodec.
1153 * - decoding: Set by libavcodec.
1158 * Picture type of the frame, see ?_TYPE below.
1159 * - encoding: Set by libavcodec. for coded_picture (and set by user for input).
1160 * - decoding: Set by libavcodec.
1162 enum AVPictureType pict_type;
1165 * pointer to the first allocated byte of the picture. Can be used in get_buffer/release_buffer.
1166 * This isn't used by libavcodec unless the default get/release_buffer() is used.
1170 uint8_t *base[AV_NUM_DATA_POINTERS];
1173 * sample aspect ratio for the video frame, 0/1 if unknown/unspecified
1174 * - encoding: unused
1175 * - decoding: Read by user.
1177 AVRational sample_aspect_ratio;
1180 * presentation timestamp in time_base units (time when frame should be shown to user)
1181 * If AV_NOPTS_VALUE then frame_rate = 1/time_base will be assumed.
1182 * - encoding: MUST be set by user.
1183 * - decoding: Set by libavcodec.
1188 * reordered pts from the last AVPacket that has been input into the decoder
1189 * - encoding: unused
1190 * - decoding: Read by user.
1195 * dts from the last AVPacket that has been input into the decoder
1196 * - encoding: unused
1197 * - decoding: Read by user.
1202 * picture number in bitstream order
1203 * - encoding: set by
1204 * - decoding: Set by libavcodec.
1206 int coded_picture_number;
1208 * picture number in display order
1209 * - encoding: set by
1210 * - decoding: Set by libavcodec.
1212 int display_picture_number;
1215 * quality (between 1 (good) and FF_LAMBDA_MAX (bad))
1216 * - encoding: Set by libavcodec. for coded_picture (and set by user for input).
1217 * - decoding: Set by libavcodec.
1222 * is this picture used as reference
1223 * The values for this are the same as the MpegEncContext.picture_structure
1224 * variable, that is 1->top field, 2->bottom field, 3->frame/both fields.
1225 * Set to 4 for delayed, non-reference frames.
1226 * - encoding: unused
1227 * - decoding: Set by libavcodec. (before get_buffer() call)).
1233 * - encoding: unused
1234 * - decoding: Set by libavcodec.
1236 int8_t *qscale_table;
1239 * - encoding: unused
1240 * - decoding: Set by libavcodec.
1250 * mbskip_table[mb]>=1 if MB didn't change
1251 * stride= mb_width = (width+15)>>4
1252 * - encoding: unused
1253 * - decoding: Set by libavcodec.
1255 uint8_t *mbskip_table;
1258 * motion vector table
1261 * int mv_sample_log2= 4 - motion_subsample_log2;
1262 * int mb_width= (width+15)>>4;
1263 * int mv_stride= (mb_width << mv_sample_log2) + 1;
1264 * motion_val[direction][x + y*mv_stride][0->mv_x, 1->mv_y];
1266 * - encoding: Set by user.
1267 * - decoding: Set by libavcodec.
1269 int16_t (*motion_val[2])[2];
1272 * macroblock type table
1273 * mb_type_base + mb_width + 2
1274 * - encoding: Set by user.
1275 * - decoding: Set by libavcodec.
1281 * - encoding: unused
1282 * - decoding: Set by libavcodec.
1287 * motion reference frame index
1288 * the order in which these are stored can depend on the codec.
1289 * - encoding: Set by user.
1290 * - decoding: Set by libavcodec.
1292 int8_t *ref_index[2];
1295 * for some private data of the user
1296 * - encoding: unused
1297 * - decoding: Set by user.
1303 * - encoding: Set by libavcodec. if flags&CODEC_FLAG_PSNR.
1304 * - decoding: unused
1306 uint64_t error[AV_NUM_DATA_POINTERS];
1309 * type of the buffer (to keep track of who has to deallocate data[*])
1310 * - encoding: Set by the one who allocates it.
1311 * - decoding: Set by the one who allocates it.
1312 * Note: User allocated (direct rendering) & internal buffers cannot coexist currently.
1317 * When decoding, this signals how much the picture must be delayed.
1318 * extra_delay = repeat_pict / (2*fps)
1319 * - encoding: unused
1320 * - decoding: Set by libavcodec.
1325 * The content of the picture is interlaced.
1326 * - encoding: Set by user.
1327 * - decoding: Set by libavcodec. (default 0)
1329 int interlaced_frame;
1332 * If the content is interlaced, is top field displayed first.
1333 * - encoding: Set by user.
1334 * - decoding: Set by libavcodec.
1336 int top_field_first;
1339 * Tell user application that palette has changed from previous frame.
1340 * - encoding: ??? (no palette-enabled encoder yet)
1341 * - decoding: Set by libavcodec. (default 0).
1343 int palette_has_changed;
1346 * codec suggestion on buffer type if != 0
1347 * - encoding: unused
1348 * - decoding: Set by libavcodec. (before get_buffer() call)).
1354 * - encoding: Set by user.
1355 * - decoding: Set by libavcodec.
1357 AVPanScan *pan_scan;
1360 * reordered opaque 64bit (generally an integer or a double precision float
1361 * PTS but can be anything).
1362 * The user sets AVCodecContext.reordered_opaque to represent the input at
1364 * the decoder reorders values as needed and sets AVFrame.reordered_opaque
1365 * to exactly one of the values provided by the user through AVCodecContext.reordered_opaque
1366 * @deprecated in favor of pkt_pts
1367 * - encoding: unused
1368 * - decoding: Read by user.
1370 int64_t reordered_opaque;
1373 * hardware accelerator private data (FFmpeg-allocated)
1374 * - encoding: unused
1375 * - decoding: Set by libavcodec
1377 void *hwaccel_picture_private;
1380 * the AVCodecContext which ff_thread_get_buffer() was last called on
1381 * - encoding: Set by libavcodec.
1382 * - decoding: Set by libavcodec.
1384 struct AVCodecContext *owner;
1387 * used by multithreading to store frame-specific info
1388 * - encoding: Set by libavcodec.
1389 * - decoding: Set by libavcodec.
1391 void *thread_opaque;
1394 * log2 of the size of the block which a single vector in motion_val represents:
1395 * (4->16x16, 3->8x8, 2-> 4x4, 1-> 2x2)
1396 * - encoding: unused
1397 * - decoding: Set by libavcodec.
1399 uint8_t motion_subsample_log2;
1402 * Sample rate of the audio data.
1404 * - encoding: unused
1405 * - decoding: read by user
1410 * Channel layout of the audio data.
1412 * - encoding: unused
1413 * - decoding: read by user.
1415 uint64_t channel_layout;
1418 * frame timestamp estimated using various heuristics, in stream time base
1419 * Code outside libavcodec should access this field using:
1420 * av_frame_get_best_effort_timestamp(frame)
1421 * - encoding: unused
1422 * - decoding: set by libavcodec, read by user.
1424 int64_t best_effort_timestamp;
1427 * reordered pos from the last AVPacket that has been input into the decoder
1428 * Code outside libavcodec should access this field using:
1429 * av_frame_get_pkt_pos(frame)
1430 * - encoding: unused
1431 * - decoding: Read by user.
1436 * duration of the corresponding packet, expressed in
1437 * AVStream->time_base units, 0 if unknown.
1438 * Code outside libavcodec should access this field using:
1439 * av_frame_get_pkt_duration(frame)
1440 * - encoding: unused
1441 * - decoding: Read by user.
1443 int64_t pkt_duration;
1447 * Code outside libavcodec should access this field using:
1448 * av_frame_get_metadata(frame)
1449 * - encoding: Set by user.
1450 * - decoding: Set by libavcodec.
1452 AVDictionary *metadata;
1455 * decode error flags of the frame, set to a combination of
1456 * FF_DECODE_ERROR_xxx flags if the decoder produced a frame, but there
1457 * were errors during the decoding.
1458 * Code outside libavcodec should access this field using:
1459 * av_frame_get_decode_error_flags(frame)
1460 * - encoding: unused
1461 * - decoding: set by libavcodec, read by user.
1463 int decode_error_flags;
1464 #define FF_DECODE_ERROR_INVALID_BITSTREAM 1
1465 #define FF_DECODE_ERROR_MISSING_REFERENCE 2
1468 * number of audio channels, only used for audio.
1469 * Code outside libavcodec should access this field using:
1470 * av_frame_get_channels(frame)
1471 * - encoding: unused
1472 * - decoding: Read by user.
1477 * size of the corresponding packet containing the compressed
1478 * frame. It must be accessed using av_frame_get_pkt_size() and
1479 * av_frame_set_pkt_size().
1480 * It is set to a negative value if unknown.
1481 * - encoding: unused
1482 * - decoding: set by libavcodec, read by user.
1488 * Accessors for some AVFrame fields.
1489 * The position of these field in the structure is not part of the ABI,
1490 * they should not be accessed directly outside libavcodec.
1492 int64_t av_frame_get_best_effort_timestamp(const AVFrame *frame);
1493 void av_frame_set_best_effort_timestamp(AVFrame *frame, int64_t val);
1494 int64_t av_frame_get_pkt_duration (const AVFrame *frame);
1495 void av_frame_set_pkt_duration (AVFrame *frame, int64_t val);
1496 int64_t av_frame_get_pkt_pos (const AVFrame *frame);
1497 void av_frame_set_pkt_pos (AVFrame *frame, int64_t val);
1498 int64_t av_frame_get_channel_layout (const AVFrame *frame);
1499 void av_frame_set_channel_layout (AVFrame *frame, int64_t val);
1500 int av_frame_get_channels (const AVFrame *frame);
1501 void av_frame_set_channels (AVFrame *frame, int val);
1502 int av_frame_get_sample_rate (const AVFrame *frame);
1503 void av_frame_set_sample_rate (AVFrame *frame, int val);
1504 AVDictionary *av_frame_get_metadata (const AVFrame *frame);
1505 void av_frame_set_metadata (AVFrame *frame, AVDictionary *val);
1506 int av_frame_get_decode_error_flags (const AVFrame *frame);
1507 void av_frame_set_decode_error_flags (AVFrame *frame, int val);
1508 int av_frame_get_pkt_size(const AVFrame *frame);
1509 void av_frame_set_pkt_size(AVFrame *frame, int val);
1511 struct AVCodecInternal;
1515 AV_FIELD_PROGRESSIVE,
1516 AV_FIELD_TT, //< Top coded_first, top displayed first
1517 AV_FIELD_BB, //< Bottom coded first, bottom displayed first
1518 AV_FIELD_TB, //< Top coded first, bottom displayed first
1519 AV_FIELD_BT, //< Bottom coded first, top displayed first
1523 * main external API structure.
1524 * New fields can be added to the end with minor version bumps.
1525 * Removal, reordering and changes to existing fields require a major
1527 * Please use AVOptions (av_opt* / av_set/get*()) to access these fields from user
1529 * sizeof(AVCodecContext) must not be used outside libav*.
1531 typedef struct AVCodecContext {
1533 * information on struct for av_log
1534 * - set by avcodec_alloc_context3
1536 const AVClass *av_class;
1537 int log_level_offset;
1539 enum AVMediaType codec_type; /* see AVMEDIA_TYPE_xxx */
1540 const struct AVCodec *codec;
1541 char codec_name[32];
1542 enum AVCodecID codec_id; /* see AV_CODEC_ID_xxx */
1545 * fourcc (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A').
1546 * This is used to work around some encoder bugs.
1547 * A demuxer should set this to what is stored in the field used to identify the codec.
1548 * If there are multiple such fields in a container then the demuxer should choose the one
1549 * which maximizes the information about the used codec.
1550 * If the codec tag field in a container is larger than 32 bits then the demuxer should
1551 * remap the longer ID to 32 bits with a table or other structure. Alternatively a new
1552 * extra_codec_tag + size could be added but for this a clear advantage must be demonstrated
1554 * - encoding: Set by user, if not then the default based on codec_id will be used.
1555 * - decoding: Set by user, will be converted to uppercase by libavcodec during init.
1557 unsigned int codec_tag;
1560 * fourcc from the AVI stream header (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A').
1561 * This is used to work around some encoder bugs.
1562 * - encoding: unused
1563 * - decoding: Set by user, will be converted to uppercase by libavcodec during init.
1565 unsigned int stream_codec_tag;
1569 * @deprecated this field is unused
1571 attribute_deprecated int sub_id;
1577 * Private context used for internal data.
1579 * Unlike priv_data, this is not codec-specific. It is used in general
1580 * libavcodec functions.
1582 struct AVCodecInternal *internal;
1585 * Private data of the user, can be used to carry app specific stuff.
1586 * - encoding: Set by user.
1587 * - decoding: Set by user.
1592 * the average bitrate
1593 * - encoding: Set by user; unused for constant quantizer encoding.
1594 * - decoding: Set by libavcodec. 0 or some bitrate if this info is available in the stream.
1599 * number of bits the bitstream is allowed to diverge from the reference.
1600 * the reference can be CBR (for CBR pass1) or VBR (for pass2)
1601 * - encoding: Set by user; unused for constant quantizer encoding.
1602 * - decoding: unused
1604 int bit_rate_tolerance;
1607 * Global quality for codecs which cannot change it per frame.
1608 * This should be proportional to MPEG-1/2/4 qscale.
1609 * - encoding: Set by user.
1610 * - decoding: unused
1615 * - encoding: Set by user.
1616 * - decoding: unused
1618 int compression_level;
1619 #define FF_COMPRESSION_DEFAULT -1
1623 * - encoding: Set by user.
1624 * - decoding: Set by user.
1630 * - encoding: Set by user.
1631 * - decoding: Set by user.
1636 * some codecs need / can use extradata like Huffman tables.
1637 * mjpeg: Huffman tables
1638 * rv10: additional flags
1639 * mpeg4: global headers (they can be in the bitstream or here)
1640 * The allocated memory should be FF_INPUT_BUFFER_PADDING_SIZE bytes larger
1641 * than extradata_size to avoid prolems if it is read with the bitstream reader.
1642 * The bytewise contents of extradata must not depend on the architecture or CPU endianness.
1643 * - encoding: Set/allocated/freed by libavcodec.
1644 * - decoding: Set/allocated/freed by user.
1650 * This is the fundamental unit of time (in seconds) in terms
1651 * of which frame timestamps are represented. For fixed-fps content,
1652 * timebase should be 1/framerate and timestamp increments should be
1654 * - encoding: MUST be set by user.
1655 * - decoding: Set by libavcodec.
1657 AVRational time_base;
1660 * For some codecs, the time base is closer to the field rate than the frame rate.
1661 * Most notably, H.264 and MPEG-2 specify time_base as half of frame duration
1662 * if no telecine is used ...
1664 * Set to time_base ticks per frame. Default 1, e.g., H.264/MPEG-2 set it to 2.
1666 int ticks_per_frame;
1671 * Encoding: Number of frames delay there will be from the encoder input to
1672 * the decoder output. (we assume the decoder matches the spec)
1673 * Decoding: Number of frames delay in addition to what a standard decoder
1674 * as specified in the spec would produce.
1677 * Number of frames the decoded output will be delayed relative to the
1681 * For encoding, this is the number of "priming" samples added to the
1682 * beginning of the stream. The decoded output will be delayed by this
1683 * many samples relative to the input to the encoder. Note that this
1684 * field is purely informational and does not directly affect the pts
1685 * output by the encoder, which should always be based on the actual
1686 * presentation time, including any delay.
1687 * For decoding, this is the number of samples the decoder needs to
1688 * output before the decoder's output is valid. When seeking, you should
1689 * start decoding this many samples prior to your desired seek point.
1691 * - encoding: Set by libavcodec.
1692 * - decoding: Set by libavcodec.
1699 * picture width / height.
1700 * - encoding: MUST be set by user.
1701 * - decoding: Set by libavcodec.
1702 * Note: For compatibility it is possible to set this instead of
1703 * coded_width/height before decoding.
1708 * Bitstream width / height, may be different from width/height if lowres enabled.
1709 * - encoding: unused
1710 * - decoding: Set by user before init if known. Codec should override / dynamically change if needed.
1712 int coded_width, coded_height;
1714 #define FF_ASPECT_EXTENDED 15
1717 * the number of pictures in a group of pictures, or 0 for intra_only
1718 * - encoding: Set by user.
1719 * - decoding: unused
1724 * Pixel format, see AV_PIX_FMT_xxx.
1725 * May be set by the demuxer if known from headers.
1726 * May be overridden by the decoder if it knows better.
1727 * - encoding: Set by user.
1728 * - decoding: Set by user if known, overridden by libavcodec if known
1730 enum AVPixelFormat pix_fmt;
1733 * Motion estimation algorithm used for video coding.
1734 * 1 (zero), 2 (full), 3 (log), 4 (phods), 5 (epzs), 6 (x1), 7 (hex),
1735 * 8 (umh), 9 (iter), 10 (tesa) [7, 8, 10 are x264 specific, 9 is snow specific]
1736 * - encoding: MUST be set by user.
1737 * - decoding: unused
1742 * If non NULL, 'draw_horiz_band' is called by the libavcodec
1743 * decoder to draw a horizontal band. It improves cache usage. Not
1744 * all codecs can do that. You must check the codec capabilities
1746 * When multithreading is used, it may be called from multiple threads
1747 * at the same time; threads might draw different parts of the same AVFrame,
1748 * or multiple AVFrames, and there is no guarantee that slices will be drawn
1750 * The function is also used by hardware acceleration APIs.
1751 * It is called at least once during frame decoding to pass
1752 * the data needed for hardware render.
1753 * In that mode instead of pixel data, AVFrame points to
1754 * a structure specific to the acceleration API. The application
1755 * reads the structure and can change some fields to indicate progress
1757 * - encoding: unused
1758 * - decoding: Set by user.
1759 * @param height the height of the slice
1760 * @param y the y position of the slice
1761 * @param type 1->top field, 2->bottom field, 3->frame
1762 * @param offset offset into the AVFrame.data from which the slice should be read
1764 void (*draw_horiz_band)(struct AVCodecContext *s,
1765 const AVFrame *src, int offset[AV_NUM_DATA_POINTERS],
1766 int y, int type, int height);
1769 * callback to negotiate the pixelFormat
1770 * @param fmt is the list of formats which are supported by the codec,
1771 * it is terminated by -1 as 0 is a valid format, the formats are ordered by quality.
1772 * The first is always the native one.
1773 * @return the chosen format
1774 * - encoding: unused
1775 * - decoding: Set by user, if not set the native format will be chosen.
1777 enum AVPixelFormat (*get_format)(struct AVCodecContext *s, const enum AVPixelFormat * fmt);
1780 * maximum number of B-frames between non-B-frames
1781 * Note: The output will be delayed by max_b_frames+1 relative to the input.
1782 * - encoding: Set by user.
1783 * - decoding: unused
1788 * qscale factor between IP and B-frames
1789 * If > 0 then the last P-frame quantizer will be used (q= lastp_q*factor+offset).
1790 * If < 0 then normal ratecontrol will be done (q= -normal_q*factor+offset).
1791 * - encoding: Set by user.
1792 * - decoding: unused
1794 float b_quant_factor;
1796 /** obsolete FIXME remove */
1798 #define FF_RC_STRATEGY_XVID 1
1800 int b_frame_strategy;
1802 #if FF_API_MPV_GLOBAL_OPTS
1804 * luma single coefficient elimination threshold
1805 * - encoding: Set by user.
1806 * - decoding: unused
1808 attribute_deprecated int luma_elim_threshold;
1811 * chroma single coeff elimination threshold
1812 * - encoding: Set by user.
1813 * - decoding: unused
1815 attribute_deprecated int chroma_elim_threshold;
1819 * qscale offset between IP and B-frames
1820 * - encoding: Set by user.
1821 * - decoding: unused
1823 float b_quant_offset;
1826 * Size of the frame reordering buffer in the decoder.
1827 * For MPEG-2 it is 1 IPB or 0 low delay IP.
1828 * - encoding: Set by libavcodec.
1829 * - decoding: Set by libavcodec.
1834 * 0-> h263 quant 1-> mpeg quant
1835 * - encoding: Set by user.
1836 * - decoding: unused
1841 * qscale factor between P and I-frames
1842 * If > 0 then the last p frame quantizer will be used (q= lastp_q*factor+offset).
1843 * If < 0 then normal ratecontrol will be done (q= -normal_q*factor+offset).
1844 * - encoding: Set by user.
1845 * - decoding: unused
1847 float i_quant_factor;
1850 * qscale offset between P and I-frames
1851 * - encoding: Set by user.
1852 * - decoding: unused
1854 float i_quant_offset;
1857 * luminance masking (0-> disabled)
1858 * - encoding: Set by user.
1859 * - decoding: unused
1864 * temporary complexity masking (0-> disabled)
1865 * - encoding: Set by user.
1866 * - decoding: unused
1868 float temporal_cplx_masking;
1871 * spatial complexity masking (0-> disabled)
1872 * - encoding: Set by user.
1873 * - decoding: unused
1875 float spatial_cplx_masking;
1878 * p block masking (0-> disabled)
1879 * - encoding: Set by user.
1880 * - decoding: unused
1885 * darkness masking (0-> disabled)
1886 * - encoding: Set by user.
1887 * - decoding: unused
1893 * - encoding: Set by libavcodec.
1894 * - decoding: Set by user (or 0).
1898 * prediction method (needed for huffyuv)
1899 * - encoding: Set by user.
1900 * - decoding: unused
1902 int prediction_method;
1903 #define FF_PRED_LEFT 0
1904 #define FF_PRED_PLANE 1
1905 #define FF_PRED_MEDIAN 2
1908 * slice offsets in the frame in bytes
1909 * - encoding: Set/allocated by libavcodec.
1910 * - decoding: Set/allocated by user (or NULL).
1915 * sample aspect ratio (0 if unknown)
1916 * That is the width of a pixel divided by the height of the pixel.
1917 * Numerator and denominator must be relatively prime and smaller than 256 for some video standards.
1918 * - encoding: Set by user.
1919 * - decoding: Set by libavcodec.
1921 AVRational sample_aspect_ratio;
1924 * motion estimation comparison function
1925 * - encoding: Set by user.
1926 * - decoding: unused
1930 * subpixel motion estimation comparison function
1931 * - encoding: Set by user.
1932 * - decoding: unused
1936 * macroblock comparison function (not supported yet)
1937 * - encoding: Set by user.
1938 * - decoding: unused
1942 * interlaced DCT comparison function
1943 * - encoding: Set by user.
1944 * - decoding: unused
1947 #define FF_CMP_SAD 0
1948 #define FF_CMP_SSE 1
1949 #define FF_CMP_SATD 2
1950 #define FF_CMP_DCT 3
1951 #define FF_CMP_PSNR 4
1952 #define FF_CMP_BIT 5
1954 #define FF_CMP_ZERO 7
1955 #define FF_CMP_VSAD 8
1956 #define FF_CMP_VSSE 9
1957 #define FF_CMP_NSSE 10
1958 #define FF_CMP_W53 11
1959 #define FF_CMP_W97 12
1960 #define FF_CMP_DCTMAX 13
1961 #define FF_CMP_DCT264 14
1962 #define FF_CMP_CHROMA 256
1965 * ME diamond size & shape
1966 * - encoding: Set by user.
1967 * - decoding: unused
1972 * amount of previous MV predictors (2a+1 x 2a+1 square)
1973 * - encoding: Set by user.
1974 * - decoding: unused
1976 int last_predictor_count;
1979 * prepass for motion estimation
1980 * - encoding: Set by user.
1981 * - decoding: unused
1986 * motion estimation prepass comparison function
1987 * - encoding: Set by user.
1988 * - decoding: unused
1993 * ME prepass diamond size & shape
1994 * - encoding: Set by user.
1995 * - decoding: unused
2001 * - encoding: Set by user.
2002 * - decoding: unused
2004 int me_subpel_quality;
2007 * DTG active format information (additional aspect ratio
2008 * information only used in DVB MPEG-2 transport streams)
2011 * - encoding: unused
2012 * - decoding: Set by decoder.
2014 int dtg_active_format;
2015 #define FF_DTG_AFD_SAME 8
2016 #define FF_DTG_AFD_4_3 9
2017 #define FF_DTG_AFD_16_9 10
2018 #define FF_DTG_AFD_14_9 11
2019 #define FF_DTG_AFD_4_3_SP_14_9 13
2020 #define FF_DTG_AFD_16_9_SP_14_9 14
2021 #define FF_DTG_AFD_SP_4_3 15
2024 * maximum motion estimation search range in subpel units
2025 * If 0 then no limit.
2027 * - encoding: Set by user.
2028 * - decoding: unused
2033 * intra quantizer bias
2034 * - encoding: Set by user.
2035 * - decoding: unused
2037 int intra_quant_bias;
2038 #define FF_DEFAULT_QUANT_BIAS 999999
2041 * inter quantizer bias
2042 * - encoding: Set by user.
2043 * - decoding: unused
2045 int inter_quant_bias;
2047 #if FF_API_COLOR_TABLE_ID
2050 * - encoding: unused
2051 * - decoding: Which clrtable should be used for 8bit RGB images.
2052 * Tables have to be stored somewhere. FIXME
2054 attribute_deprecated int color_table_id;
2059 * - encoding: unused
2060 * - decoding: Set by user.
2063 #define SLICE_FLAG_CODED_ORDER 0x0001 ///< draw_horiz_band() is called in coded order instead of display
2064 #define SLICE_FLAG_ALLOW_FIELD 0x0002 ///< allow draw_horiz_band() with field slices (MPEG2 field pics)
2065 #define SLICE_FLAG_ALLOW_PLANE 0x0004 ///< allow draw_horiz_band() with 1 component at a time (SVQ1)
2068 * XVideo Motion Acceleration
2069 * - encoding: forbidden
2070 * - decoding: set by decoder
2072 int xvmc_acceleration;
2075 * macroblock decision mode
2076 * - encoding: Set by user.
2077 * - decoding: unused
2080 #define FF_MB_DECISION_SIMPLE 0 ///< uses mb_cmp
2081 #define FF_MB_DECISION_BITS 1 ///< chooses the one which needs the fewest bits
2082 #define FF_MB_DECISION_RD 2 ///< rate distortion
2085 * custom intra quantization matrix
2086 * - encoding: Set by user, can be NULL.
2087 * - decoding: Set by libavcodec.
2089 uint16_t *intra_matrix;
2092 * custom inter quantization matrix
2093 * - encoding: Set by user, can be NULL.
2094 * - decoding: Set by libavcodec.
2096 uint16_t *inter_matrix;
2099 * scene change detection threshold
2100 * 0 is default, larger means fewer detected scene changes.
2101 * - encoding: Set by user.
2102 * - decoding: unused
2104 int scenechange_threshold;
2107 * noise reduction strength
2108 * - encoding: Set by user.
2109 * - decoding: unused
2111 int noise_reduction;
2113 #if FF_API_INTER_THRESHOLD
2115 * @deprecated this field is unused
2117 attribute_deprecated int inter_threshold;
2120 #if FF_API_MPV_GLOBAL_OPTS
2122 * @deprecated use mpegvideo private options instead
2124 attribute_deprecated int quantizer_noise_shaping;
2128 * Motion estimation threshold below which no motion estimation is
2129 * performed, but instead the user specified motion vectors are used.
2131 * - encoding: Set by user.
2132 * - decoding: unused
2137 * Macroblock threshold below which the user specified macroblock types will be used.
2138 * - encoding: Set by user.
2139 * - decoding: unused
2144 * precision of the intra DC coefficient - 8
2145 * - encoding: Set by user.
2146 * - decoding: unused
2148 int intra_dc_precision;
2151 * Number of macroblock rows at the top which are skipped.
2152 * - encoding: unused
2153 * - decoding: Set by user.
2158 * Number of macroblock rows at the bottom which are skipped.
2159 * - encoding: unused
2160 * - decoding: Set by user.
2165 * Border processing masking, raises the quantizer for mbs on the borders
2167 * - encoding: Set by user.
2168 * - decoding: unused
2170 float border_masking;
2173 * minimum MB lagrange multipler
2174 * - encoding: Set by user.
2175 * - decoding: unused
2180 * maximum MB lagrange multipler
2181 * - encoding: Set by user.
2182 * - decoding: unused
2188 * - encoding: Set by user.
2189 * - decoding: unused
2191 int me_penalty_compensation;
2195 * - encoding: Set by user.
2196 * - decoding: unused
2202 * - encoding: Set by user.
2203 * - decoding: unused
2209 * - encoding: Set by user.
2210 * - decoding: unused
2215 * number of reference frames
2216 * - encoding: Set by user.
2217 * - decoding: Set by lavc.
2222 * chroma qp offset from luma
2223 * - encoding: Set by user.
2224 * - decoding: unused
2229 * Multiplied by qscale for each frame and added to scene_change_score.
2230 * - encoding: Set by user.
2231 * - decoding: unused
2233 int scenechange_factor;
2237 * Note: Value depends upon the compare function used for fullpel ME.
2238 * - encoding: Set by user.
2239 * - decoding: unused
2244 * Adjust sensitivity of b_frame_strategy 1.
2245 * - encoding: Set by user.
2246 * - decoding: unused
2251 * Chromaticity coordinates of the source primaries.
2252 * - encoding: Set by user
2253 * - decoding: Set by libavcodec
2255 enum AVColorPrimaries color_primaries;
2258 * Color Transfer Characteristic.
2259 * - encoding: Set by user
2260 * - decoding: Set by libavcodec
2262 enum AVColorTransferCharacteristic color_trc;
2265 * YUV colorspace type.
2266 * - encoding: Set by user
2267 * - decoding: Set by libavcodec
2269 enum AVColorSpace colorspace;
2272 * MPEG vs JPEG YUV range.
2273 * - encoding: Set by user
2274 * - decoding: Set by libavcodec
2276 enum AVColorRange color_range;
2279 * This defines the location of chroma samples.
2280 * - encoding: Set by user
2281 * - decoding: Set by libavcodec
2283 enum AVChromaLocation chroma_sample_location;
2287 * Indicates number of picture subdivisions. Used for parallelized
2289 * - encoding: Set by user
2290 * - decoding: unused
2295 * - encoding: set by libavcodec
2296 * - decoding: Set by user.
2298 enum AVFieldOrder field_order;
2301 int sample_rate; ///< samples per second
2302 int channels; ///< number of audio channels
2305 * audio sample format
2306 * - encoding: Set by user.
2307 * - decoding: Set by libavcodec.
2309 enum AVSampleFormat sample_fmt; ///< sample format
2311 /* The following data should not be initialized. */
2313 * Number of samples per channel in an audio frame.
2315 * - encoding: set by libavcodec in avcodec_open2(). Each submitted frame
2316 * except the last must contain exactly frame_size samples per channel.
2317 * May be 0 when the codec has CODEC_CAP_VARIABLE_FRAME_SIZE set, then the
2318 * frame size is not restricted.
2319 * - decoding: may be set by some decoders to indicate constant frame size
2324 * Frame counter, set by libavcodec.
2326 * - decoding: total number of frames returned from the decoder so far.
2327 * - encoding: total number of frames passed to the encoder so far.
2329 * @note the counter is not incremented if encoding/decoding resulted in
2335 * number of bytes per packet if constant and known or 0
2336 * Used by some WAV based audio codecs.
2341 * Audio cutoff bandwidth (0 means "automatic")
2342 * - encoding: Set by user.
2343 * - decoding: unused
2347 #if FF_API_REQUEST_CHANNELS
2349 * Decoder should decode to this many channels if it can (0 for default)
2350 * - encoding: unused
2351 * - decoding: Set by user.
2352 * @deprecated Deprecated in favor of request_channel_layout.
2354 int request_channels;
2358 * Audio channel layout.
2359 * - encoding: set by user.
2360 * - decoding: set by user, may be overwritten by libavcodec.
2362 uint64_t channel_layout;
2365 * Request decoder to use this channel layout if it can (0 for default)
2366 * - encoding: unused
2367 * - decoding: Set by user.
2369 uint64_t request_channel_layout;
2372 * Type of service that the audio stream conveys.
2373 * - encoding: Set by user.
2374 * - decoding: Set by libavcodec.
2376 enum AVAudioServiceType audio_service_type;
2379 * desired sample format
2380 * - encoding: Not used.
2381 * - decoding: Set by user.
2382 * Decoder will decode to this format if it can.
2384 enum AVSampleFormat request_sample_fmt;
2387 * Called at the beginning of each frame to get a buffer for it.
2389 * The function will set AVFrame.data[], AVFrame.linesize[].
2390 * AVFrame.extended_data[] must also be set, but it should be the same as
2391 * AVFrame.data[] except for planar audio with more channels than can fit
2392 * in AVFrame.data[]. In that case, AVFrame.data[] shall still contain as
2393 * many data pointers as it can hold.
2395 * if CODEC_CAP_DR1 is not set then get_buffer() must call
2396 * avcodec_default_get_buffer() instead of providing buffers allocated by
2399 * AVFrame.data[] should be 32- or 16-byte-aligned unless the CPU doesn't
2400 * need it. avcodec_default_get_buffer() aligns the output buffer properly,
2401 * but if get_buffer() is overridden then alignment considerations should
2402 * be taken into account.
2404 * @see avcodec_default_get_buffer()
2408 * If pic.reference is set then the frame will be read later by libavcodec.
2409 * avcodec_align_dimensions2() should be used to find the required width and
2410 * height, as they normally need to be rounded up to the next multiple of 16.
2412 * If frame multithreading is used and thread_safe_callbacks is set,
2413 * it may be called from a different thread, but not from more than one at
2414 * once. Does not need to be reentrant.
2416 * @see release_buffer(), reget_buffer()
2417 * @see avcodec_align_dimensions2()
2421 * Decoders request a buffer of a particular size by setting
2422 * AVFrame.nb_samples prior to calling get_buffer(). The decoder may,
2423 * however, utilize only part of the buffer by setting AVFrame.nb_samples
2424 * to a smaller value in the output frame.
2426 * Decoders cannot use the buffer after returning from
2427 * avcodec_decode_audio4(), so they will not call release_buffer(), as it
2428 * is assumed to be released immediately upon return. In some rare cases,
2429 * a decoder may need to call get_buffer() more than once in a single
2430 * call to avcodec_decode_audio4(). In that case, when get_buffer() is
2431 * called again after it has already been called once, the previously
2432 * acquired buffer is assumed to be released at that time and may not be
2433 * reused by the decoder.
2435 * As a convenience, av_samples_get_buffer_size() and
2436 * av_samples_fill_arrays() in libavutil may be used by custom get_buffer()
2437 * functions to find the required data size and to fill data pointers and
2438 * linesize. In AVFrame.linesize, only linesize[0] may be set for audio
2439 * since all planes must be the same size.
2441 * @see av_samples_get_buffer_size(), av_samples_fill_arrays()
2443 * - encoding: unused
2444 * - decoding: Set by libavcodec, user can override.
2446 int (*get_buffer)(struct AVCodecContext *c, AVFrame *pic);
2449 * Called to release buffers which were allocated with get_buffer.
2450 * A released buffer can be reused in get_buffer().
2451 * pic.data[*] must be set to NULL.
2452 * May be called from a different thread if frame multithreading is used,
2453 * but not by more than one thread at once, so does not need to be reentrant.
2454 * - encoding: unused
2455 * - decoding: Set by libavcodec, user can override.
2457 void (*release_buffer)(struct AVCodecContext *c, AVFrame *pic);
2460 * Called at the beginning of a frame to get cr buffer for it.
2461 * Buffer type (size, hints) must be the same. libavcodec won't check it.
2462 * libavcodec will pass previous buffer in pic, function should return
2463 * same buffer or new buffer with old frame "painted" into it.
2464 * If pic.data[0] == NULL must behave like get_buffer().
2465 * if CODEC_CAP_DR1 is not set then reget_buffer() must call
2466 * avcodec_default_reget_buffer() instead of providing buffers allocated by
2468 * - encoding: unused
2469 * - decoding: Set by libavcodec, user can override.
2471 int (*reget_buffer)(struct AVCodecContext *c, AVFrame *pic);
2474 /* - encoding parameters */
2475 float qcompress; ///< amount of qscale change between easy & hard scenes (0.0-1.0)
2476 float qblur; ///< amount of qscale smoothing over time (0.0-1.0)
2480 * - encoding: Set by user.
2481 * - decoding: unused
2487 * - encoding: Set by user.
2488 * - decoding: unused
2493 * maximum quantizer difference between frames
2494 * - encoding: Set by user.
2495 * - decoding: unused
2500 * ratecontrol qmin qmax limiting method
2501 * 0-> clipping, 1-> use a nice continuous function to limit qscale wthin qmin/qmax.
2502 * - encoding: Set by user.
2503 * - decoding: unused
2511 * decoder bitstream buffer size
2512 * - encoding: Set by user.
2513 * - decoding: unused
2518 * ratecontrol override, see RcOverride
2519 * - encoding: Allocated/set/freed by user.
2520 * - decoding: unused
2522 int rc_override_count;
2523 RcOverride *rc_override;
2526 * rate control equation
2527 * - encoding: Set by user
2528 * - decoding: unused
2534 * - encoding: Set by user.
2535 * - decoding: unused
2541 * - encoding: Set by user.
2542 * - decoding: unused
2546 float rc_buffer_aggressivity;
2549 * initial complexity for pass1 ratecontrol
2550 * - encoding: Set by user.
2551 * - decoding: unused
2553 float rc_initial_cplx;
2556 * Ratecontrol attempt to use, at maximum, <value> of what can be used without an underflow.
2557 * - encoding: Set by user.
2558 * - decoding: unused.
2560 float rc_max_available_vbv_use;
2563 * Ratecontrol attempt to use, at least, <value> times the amount needed to prevent a vbv overflow.
2564 * - encoding: Set by user.
2565 * - decoding: unused.
2567 float rc_min_vbv_overflow_use;
2570 * Number of bits which should be loaded into the rc buffer before decoding starts.
2571 * - encoding: Set by user.
2572 * - decoding: unused
2574 int rc_initial_buffer_occupancy;
2576 #define FF_CODER_TYPE_VLC 0
2577 #define FF_CODER_TYPE_AC 1
2578 #define FF_CODER_TYPE_RAW 2
2579 #define FF_CODER_TYPE_RLE 3
2580 #define FF_CODER_TYPE_DEFLATE 4
2583 * - encoding: Set by user.
2584 * - decoding: unused
2590 * - encoding: Set by user.
2591 * - decoding: unused
2596 * minimum Lagrange multipler
2597 * - encoding: Set by user.
2598 * - decoding: unused
2603 * maximum Lagrange multipler
2604 * - encoding: Set by user.
2605 * - decoding: unused
2610 * frame skip threshold
2611 * - encoding: Set by user.
2612 * - decoding: unused
2614 int frame_skip_threshold;
2618 * - encoding: Set by user.
2619 * - decoding: unused
2621 int frame_skip_factor;
2624 * frame skip exponent
2625 * - encoding: Set by user.
2626 * - decoding: unused
2631 * frame skip comparison function
2632 * - encoding: Set by user.
2633 * - decoding: unused
2638 * trellis RD quantization
2639 * - encoding: Set by user.
2640 * - decoding: unused
2645 * - encoding: Set by user.
2646 * - decoding: unused
2648 int min_prediction_order;
2651 * - encoding: Set by user.
2652 * - decoding: unused
2654 int max_prediction_order;
2657 * GOP timecode frame start number
2658 * - encoding: Set by user, in non drop frame format
2659 * - decoding: Set by libavcodec (timecode in the 25 bits format, -1 if unset)
2661 int64_t timecode_frame_start;
2663 /* The RTP callback: This function is called */
2664 /* every time the encoder has a packet to send. */
2665 /* It depends on the encoder if the data starts */
2666 /* with a Start Code (it should). H.263 does. */
2667 /* mb_nb contains the number of macroblocks */
2668 /* encoded in the RTP payload. */
2669 void (*rtp_callback)(struct AVCodecContext *avctx, void *data, int size, int mb_nb);
2671 int rtp_payload_size; /* The size of the RTP payload: the coder will */
2672 /* do its best to deliver a chunk with size */
2673 /* below rtp_payload_size, the chunk will start */
2674 /* with a start code on some codecs like H.263. */
2675 /* This doesn't take account of any particular */
2676 /* headers inside the transmitted RTP payload. */
2678 /* statistics, used for 2-pass encoding */
2689 * number of bits used for the previously encoded frame
2690 * - encoding: Set by libavcodec.
2691 * - decoding: unused
2696 * pass1 encoding statistics output buffer
2697 * - encoding: Set by libavcodec.
2698 * - decoding: unused
2703 * pass2 encoding statistics input buffer
2704 * Concatenated stuff from stats_out of pass1 should be placed here.
2705 * - encoding: Allocated/set/freed by user.
2706 * - decoding: unused
2711 * Work around bugs in encoders which sometimes cannot be detected automatically.
2712 * - encoding: Set by user
2713 * - decoding: Set by user
2715 int workaround_bugs;
2716 #define FF_BUG_AUTODETECT 1 ///< autodetection
2717 #define FF_BUG_OLD_MSMPEG4 2
2718 #define FF_BUG_XVID_ILACE 4
2719 #define FF_BUG_UMP4 8
2720 #define FF_BUG_NO_PADDING 16
2721 #define FF_BUG_AMV 32
2722 #define FF_BUG_AC_VLC 0 ///< Will be removed, libavcodec can now handle these non-compliant files by default.
2723 #define FF_BUG_QPEL_CHROMA 64
2724 #define FF_BUG_STD_QPEL 128
2725 #define FF_BUG_QPEL_CHROMA2 256
2726 #define FF_BUG_DIRECT_BLOCKSIZE 512
2727 #define FF_BUG_EDGE 1024
2728 #define FF_BUG_HPEL_CHROMA 2048
2729 #define FF_BUG_DC_CLIP 4096
2730 #define FF_BUG_MS 8192 ///< Work around various bugs in Microsoft's broken decoders.
2731 #define FF_BUG_TRUNCATED 16384
2734 * strictly follow the standard (MPEG4, ...).
2735 * - encoding: Set by user.
2736 * - decoding: Set by user.
2737 * Setting this to STRICT or higher means the encoder and decoder will
2738 * generally do stupid things, whereas setting it to unofficial or lower
2739 * will mean the encoder might produce output that is not supported by all
2740 * spec-compliant decoders. Decoders don't differentiate between normal,
2741 * unofficial and experimental (that is, they always try to decode things
2742 * when they can) unless they are explicitly asked to behave stupidly
2743 * (=strictly conform to the specs)
2745 int strict_std_compliance;
2746 #define FF_COMPLIANCE_VERY_STRICT 2 ///< Strictly conform to an older more strict version of the spec or reference software.
2747 #define FF_COMPLIANCE_STRICT 1 ///< Strictly conform to all the things in the spec no matter what consequences.
2748 #define FF_COMPLIANCE_NORMAL 0
2749 #define FF_COMPLIANCE_UNOFFICIAL -1 ///< Allow unofficial extensions
2750 #define FF_COMPLIANCE_EXPERIMENTAL -2 ///< Allow nonstandardized experimental things.
2753 * error concealment flags
2754 * - encoding: unused
2755 * - decoding: Set by user.
2757 int error_concealment;
2758 #define FF_EC_GUESS_MVS 1
2759 #define FF_EC_DEBLOCK 2
2763 * - encoding: Set by user.
2764 * - decoding: Set by user.
2767 #define FF_DEBUG_PICT_INFO 1
2768 #define FF_DEBUG_RC 2
2769 #define FF_DEBUG_BITSTREAM 4
2770 #define FF_DEBUG_MB_TYPE 8
2771 #define FF_DEBUG_QP 16
2772 #define FF_DEBUG_MV 32
2773 #define FF_DEBUG_DCT_COEFF 0x00000040
2774 #define FF_DEBUG_SKIP 0x00000080
2775 #define FF_DEBUG_STARTCODE 0x00000100
2776 #define FF_DEBUG_PTS 0x00000200
2777 #define FF_DEBUG_ER 0x00000400
2778 #define FF_DEBUG_MMCO 0x00000800
2779 #define FF_DEBUG_BUGS 0x00001000
2780 #define FF_DEBUG_VIS_QP 0x00002000
2781 #define FF_DEBUG_VIS_MB_TYPE 0x00004000
2782 #define FF_DEBUG_BUFFERS 0x00008000
2783 #define FF_DEBUG_THREADS 0x00010000
2787 * - encoding: Set by user.
2788 * - decoding: Set by user.
2791 #define FF_DEBUG_VIS_MV_P_FOR 0x00000001 //visualize forward predicted MVs of P frames
2792 #define FF_DEBUG_VIS_MV_B_FOR 0x00000002 //visualize forward predicted MVs of B frames
2793 #define FF_DEBUG_VIS_MV_B_BACK 0x00000004 //visualize backward predicted MVs of B frames
2796 * Error recognition; may misdetect some more or less valid parts as errors.
2797 * - encoding: unused
2798 * - decoding: Set by user.
2800 int err_recognition;
2801 #define AV_EF_CRCCHECK (1<<0)
2802 #define AV_EF_BITSTREAM (1<<1)
2803 #define AV_EF_BUFFER (1<<2)
2804 #define AV_EF_EXPLODE (1<<3)
2806 #define AV_EF_CAREFUL (1<<16)
2807 #define AV_EF_COMPLIANT (1<<17)
2808 #define AV_EF_AGGRESSIVE (1<<18)
2812 * opaque 64bit number (generally a PTS) that will be reordered and
2813 * output in AVFrame.reordered_opaque
2814 * @deprecated in favor of pkt_pts
2815 * - encoding: unused
2816 * - decoding: Set by user.
2818 int64_t reordered_opaque;
2821 * Hardware accelerator in use
2822 * - encoding: unused.
2823 * - decoding: Set by libavcodec
2825 struct AVHWAccel *hwaccel;
2828 * Hardware accelerator context.
2829 * For some hardware accelerators, a global context needs to be
2830 * provided by the user. In that case, this holds display-dependent
2831 * data FFmpeg cannot instantiate itself. Please refer to the
2832 * FFmpeg HW accelerator documentation to know how to fill this
2833 * is. e.g. for VA API, this is a struct vaapi_context.
2834 * - encoding: unused
2835 * - decoding: Set by user
2837 void *hwaccel_context;
2841 * - encoding: Set by libavcodec if flags&CODEC_FLAG_PSNR.
2842 * - decoding: unused
2844 uint64_t error[AV_NUM_DATA_POINTERS];
2847 * DCT algorithm, see FF_DCT_* below
2848 * - encoding: Set by user.
2849 * - decoding: unused
2852 #define FF_DCT_AUTO 0
2853 #define FF_DCT_FASTINT 1
2854 #define FF_DCT_INT 2
2855 #define FF_DCT_MMX 3
2856 #define FF_DCT_ALTIVEC 5
2857 #define FF_DCT_FAAN 6
2860 * IDCT algorithm, see FF_IDCT_* below.
2861 * - encoding: Set by user.
2862 * - decoding: Set by user.
2865 #define FF_IDCT_AUTO 0
2866 #define FF_IDCT_INT 1
2867 #define FF_IDCT_SIMPLE 2
2868 #define FF_IDCT_SIMPLEMMX 3
2869 #define FF_IDCT_LIBMPEG2MMX 4
2871 #define FF_IDCT_MMI 5
2873 #define FF_IDCT_ARM 7
2874 #define FF_IDCT_ALTIVEC 8
2875 #define FF_IDCT_SH4 9
2876 #define FF_IDCT_SIMPLEARM 10
2877 #define FF_IDCT_H264 11
2878 #define FF_IDCT_VP3 12
2879 #define FF_IDCT_IPP 13
2880 #define FF_IDCT_XVIDMMX 14
2881 #define FF_IDCT_CAVS 15
2882 #define FF_IDCT_SIMPLEARMV5TE 16
2883 #define FF_IDCT_SIMPLEARMV6 17
2884 #define FF_IDCT_SIMPLEVIS 18
2885 #define FF_IDCT_WMV2 19
2886 #define FF_IDCT_FAAN 20
2887 #define FF_IDCT_EA 21
2888 #define FF_IDCT_SIMPLENEON 22
2889 #define FF_IDCT_SIMPLEALPHA 23
2890 #define FF_IDCT_BINK 24
2895 * @deprecated use av_set_cpu_flags_mask() instead.
2897 attribute_deprecated unsigned dsp_mask;
2901 * bits per sample/pixel from the demuxer (needed for huffyuv).
2902 * - encoding: Set by libavcodec.
2903 * - decoding: Set by user.
2905 int bits_per_coded_sample;
2908 * Bits per sample/pixel of internal libavcodec pixel/sample format.
2909 * - encoding: set by user.
2910 * - decoding: set by libavcodec.
2912 int bits_per_raw_sample;
2915 * low resolution decoding, 1-> 1/2 size, 2->1/4 size
2916 * - encoding: unused
2917 * - decoding: Set by user.
2922 * the picture in the bitstream
2923 * - encoding: Set by libavcodec.
2924 * - decoding: Set by libavcodec.
2926 AVFrame *coded_frame;
2930 * is used to decide how many independent tasks should be passed to execute()
2931 * - encoding: Set by user.
2932 * - decoding: Set by user.
2937 * Which multithreading methods to use.
2938 * Use of FF_THREAD_FRAME will increase decoding delay by one frame per thread,
2939 * so clients which cannot provide future frames should not use it.
2941 * - encoding: Set by user, otherwise the default is used.
2942 * - decoding: Set by user, otherwise the default is used.
2945 #define FF_THREAD_FRAME 1 ///< Decode more than one frame at once
2946 #define FF_THREAD_SLICE 2 ///< Decode more than one part of a single frame at once
2949 * Which multithreading methods are in use by the codec.
2950 * - encoding: Set by libavcodec.
2951 * - decoding: Set by libavcodec.
2953 int active_thread_type;
2956 * Set by the client if its custom get_buffer() callback can be called
2957 * synchronously from another thread, which allows faster multithreaded decoding.
2958 * draw_horiz_band() will be called from other threads regardless of this setting.
2959 * Ignored if the default get_buffer() is used.
2960 * - encoding: Set by user.
2961 * - decoding: Set by user.
2963 int thread_safe_callbacks;
2966 * The codec may call this to execute several independent things.
2967 * It will return only after finishing all tasks.
2968 * The user may replace this with some multithreaded implementation,
2969 * the default implementation will execute the parts serially.
2970 * @param count the number of things to execute
2971 * - encoding: Set by libavcodec, user can override.
2972 * - decoding: Set by libavcodec, user can override.
2974 int (*execute)(struct AVCodecContext *c, int (*func)(struct AVCodecContext *c2, void *arg), void *arg2, int *ret, int count, int size);
2977 * The codec may call this to execute several independent things.
2978 * It will return only after finishing all tasks.
2979 * The user may replace this with some multithreaded implementation,
2980 * the default implementation will execute the parts serially.
2981 * Also see avcodec_thread_init and e.g. the --enable-pthread configure option.
2982 * @param c context passed also to func
2983 * @param count the number of things to execute
2984 * @param arg2 argument passed unchanged to func
2985 * @param ret return values of executed functions, must have space for "count" values. May be NULL.
2986 * @param func function that will be called count times, with jobnr from 0 to count-1.
2987 * threadnr will be in the range 0 to c->thread_count-1 < MAX_THREADS and so that no
2988 * two instances of func executing at the same time will have the same threadnr.
2989 * @return always 0 currently, but code should handle a future improvement where when any call to func
2990 * returns < 0 no further calls to func may be done and < 0 is returned.
2991 * - encoding: Set by libavcodec, user can override.
2992 * - decoding: Set by libavcodec, user can override.
2994 int (*execute2)(struct AVCodecContext *c, int (*func)(struct AVCodecContext *c2, void *arg, int jobnr, int threadnr), void *arg2, int *ret, int count);
2998 * Can be used by execute() to store some per AVCodecContext stuff.
2999 * - encoding: set by execute()
3000 * - decoding: set by execute()
3002 void *thread_opaque;
3005 * noise vs. sse weight for the nsse comparsion function
3006 * - encoding: Set by user.
3007 * - decoding: unused
3013 * - encoding: Set by user.
3014 * - decoding: Set by libavcodec.
3017 #define FF_PROFILE_UNKNOWN -99
3018 #define FF_PROFILE_RESERVED -100
3020 #define FF_PROFILE_AAC_MAIN 0
3021 #define FF_PROFILE_AAC_LOW 1
3022 #define FF_PROFILE_AAC_SSR 2
3023 #define FF_PROFILE_AAC_LTP 3
3024 #define FF_PROFILE_AAC_HE 4
3025 #define FF_PROFILE_AAC_HE_V2 28
3026 #define FF_PROFILE_AAC_LD 22
3027 #define FF_PROFILE_AAC_ELD 38
3029 #define FF_PROFILE_DTS 20
3030 #define FF_PROFILE_DTS_ES 30
3031 #define FF_PROFILE_DTS_96_24 40
3032 #define FF_PROFILE_DTS_HD_HRA 50
3033 #define FF_PROFILE_DTS_HD_MA 60
3035 #define FF_PROFILE_MPEG2_422 0
3036 #define FF_PROFILE_MPEG2_HIGH 1
3037 #define FF_PROFILE_MPEG2_SS 2
3038 #define FF_PROFILE_MPEG2_SNR_SCALABLE 3
3039 #define FF_PROFILE_MPEG2_MAIN 4
3040 #define FF_PROFILE_MPEG2_SIMPLE 5
3042 #define FF_PROFILE_H264_CONSTRAINED (1<<9) // 8+1; constraint_set1_flag
3043 #define FF_PROFILE_H264_INTRA (1<<11) // 8+3; constraint_set3_flag
3045 #define FF_PROFILE_H264_BASELINE 66
3046 #define FF_PROFILE_H264_CONSTRAINED_BASELINE (66|FF_PROFILE_H264_CONSTRAINED)
3047 #define FF_PROFILE_H264_MAIN 77
3048 #define FF_PROFILE_H264_EXTENDED 88
3049 #define FF_PROFILE_H264_HIGH 100
3050 #define FF_PROFILE_H264_HIGH_10 110
3051 #define FF_PROFILE_H264_HIGH_10_INTRA (110|FF_PROFILE_H264_INTRA)
3052 #define FF_PROFILE_H264_HIGH_422 122
3053 #define FF_PROFILE_H264_HIGH_422_INTRA (122|FF_PROFILE_H264_INTRA)
3054 #define FF_PROFILE_H264_HIGH_444 144
3055 #define FF_PROFILE_H264_HIGH_444_PREDICTIVE 244
3056 #define FF_PROFILE_H264_HIGH_444_INTRA (244|FF_PROFILE_H264_INTRA)
3057 #define FF_PROFILE_H264_CAVLC_444 44
3059 #define FF_PROFILE_VC1_SIMPLE 0
3060 #define FF_PROFILE_VC1_MAIN 1
3061 #define FF_PROFILE_VC1_COMPLEX 2
3062 #define FF_PROFILE_VC1_ADVANCED 3
3064 #define FF_PROFILE_MPEG4_SIMPLE 0
3065 #define FF_PROFILE_MPEG4_SIMPLE_SCALABLE 1
3066 #define FF_PROFILE_MPEG4_CORE 2
3067 #define FF_PROFILE_MPEG4_MAIN 3
3068 #define FF_PROFILE_MPEG4_N_BIT 4
3069 #define FF_PROFILE_MPEG4_SCALABLE_TEXTURE 5
3070 #define FF_PROFILE_MPEG4_SIMPLE_FACE_ANIMATION 6
3071 #define FF_PROFILE_MPEG4_BASIC_ANIMATED_TEXTURE 7
3072 #define FF_PROFILE_MPEG4_HYBRID 8
3073 #define FF_PROFILE_MPEG4_ADVANCED_REAL_TIME 9
3074 #define FF_PROFILE_MPEG4_CORE_SCALABLE 10
3075 #define FF_PROFILE_MPEG4_ADVANCED_CODING 11
3076 #define FF_PROFILE_MPEG4_ADVANCED_CORE 12
3077 #define FF_PROFILE_MPEG4_ADVANCED_SCALABLE_TEXTURE 13
3078 #define FF_PROFILE_MPEG4_SIMPLE_STUDIO 14
3079 #define FF_PROFILE_MPEG4_ADVANCED_SIMPLE 15
3083 * - encoding: Set by user.
3084 * - decoding: Set by libavcodec.
3087 #define FF_LEVEL_UNKNOWN -99
3091 * - encoding: unused
3092 * - decoding: Set by user.
3094 enum AVDiscard skip_loop_filter;
3098 * - encoding: unused
3099 * - decoding: Set by user.
3101 enum AVDiscard skip_idct;
3105 * - encoding: unused
3106 * - decoding: Set by user.
3108 enum AVDiscard skip_frame;
3111 * Header containing style information for text subtitles.
3112 * For SUBTITLE_ASS subtitle type, it should contain the whole ASS
3113 * [Script Info] and [V4+ Styles] section, plus the [Events] line and
3114 * the Format line following. It shouldn't include any Dialogue line.
3115 * - encoding: Set/allocated/freed by user (before avcodec_open2())
3116 * - decoding: Set/allocated/freed by libavcodec (by avcodec_open2())
3118 uint8_t *subtitle_header;
3119 int subtitle_header_size;
3122 * Simulates errors in the bitstream to test error concealment.
3123 * - encoding: Set by user.
3124 * - decoding: unused
3129 * Current packet as passed into the decoder, to avoid having
3130 * to pass the packet into every function. Currently only valid
3131 * inside lavc and get/release_buffer callbacks.
3132 * - decoding: set by avcodec_decode_*, read by get_buffer() for setting pkt_pts
3133 * - encoding: unused
3138 * VBV delay coded in the last frame (in periods of a 27 MHz clock).
3139 * Used for compliant TS muxing.
3140 * - encoding: Set by libavcodec.
3141 * - decoding: unused.
3146 * Timebase in which pkt_dts/pts and AVPacket.dts/pts are.
3147 * Code outside libavcodec should access this field using:
3148 * avcodec_set_pkt_timebase(avctx)
3149 * - encoding unused.
3150 * - decodimg set by user
3152 AVRational pkt_timebase;
3156 * Code outside libavcodec should access this field using:
3157 * avcodec_get_codec_descriptior(avctx)
3158 * - encoding: unused.
3159 * - decoding: set by libavcodec.
3161 const AVCodecDescriptor *codec_descriptor;
3164 * Current statistics for PTS correction.
3165 * - decoding: maintained and used by libavcodec, not intended to be used by user apps
3166 * - encoding: unused
3168 int64_t pts_correction_num_faulty_pts; /// Number of incorrect PTS values so far
3169 int64_t pts_correction_num_faulty_dts; /// Number of incorrect DTS values so far
3170 int64_t pts_correction_last_pts; /// PTS of the last frame
3171 int64_t pts_correction_last_dts; /// DTS of the last frame
3174 * Current frame metadata.
3175 * - decoding: maintained and used by libavcodec, not intended to be used by user apps
3176 * - encoding: unused
3178 AVDictionary *metadata;
3181 AVRational av_codec_get_pkt_timebase (const AVCodecContext *avctx);
3182 void av_codec_set_pkt_timebase (AVCodecContext *avctx, AVRational val);
3184 const AVCodecDescriptor *av_codec_get_codec_descriptor(const AVCodecContext *avctx);
3185 void av_codec_set_codec_descriptor(AVCodecContext *avctx, const AVCodecDescriptor *desc);
3190 typedef struct AVProfile {
3192 const char *name; ///< short name for the profile
3195 typedef struct AVCodecDefault AVCodecDefault;
3202 typedef struct AVCodec {
3204 * Name of the codec implementation.
3205 * The name is globally unique among encoders and among decoders (but an
3206 * encoder and a decoder can share the same name).
3207 * This is the primary way to find a codec from the user perspective.
3211 * Descriptive name for the codec, meant to be more human readable than name.
3212 * You should use the NULL_IF_CONFIG_SMALL() macro to define it.
3214 const char *long_name;
3215 enum AVMediaType type;
3218 * Codec capabilities.
3222 const AVRational *supported_framerates; ///< array of supported framerates, or NULL if any, array is terminated by {0,0}
3223 const enum AVPixelFormat *pix_fmts; ///< array of supported pixel formats, or NULL if unknown, array is terminated by -1
3224 const int *supported_samplerates; ///< array of supported audio samplerates, or NULL if unknown, array is terminated by 0
3225 const enum AVSampleFormat *sample_fmts; ///< array of supported sample formats, or NULL if unknown, array is terminated by -1
3226 const uint64_t *channel_layouts; ///< array of support channel layouts, or NULL if unknown. array is terminated by 0
3227 uint8_t max_lowres; ///< maximum value for lowres supported by the decoder
3228 const AVClass *priv_class; ///< AVClass for the private context
3229 const AVProfile *profiles; ///< array of recognized profiles, or NULL if unknown, array is terminated by {FF_PROFILE_UNKNOWN}
3231 /*****************************************************************
3232 * No fields below this line are part of the public API. They
3233 * may not be used outside of libavcodec and can be changed and
3235 * New public fields should be added right above.
3236 *****************************************************************
3239 struct AVCodec *next;
3241 * @name Frame-level threading support functions
3245 * If defined, called on thread contexts when they are created.
3246 * If the codec allocates writable tables in init(), re-allocate them here.
3247 * priv_data will be set to a copy of the original.
3249 int (*init_thread_copy)(AVCodecContext *);
3251 * Copy necessary context variables from a previous thread context to the current one.
3252 * If not defined, the next thread will start automatically; otherwise, the codec
3253 * must call ff_thread_finish_setup().
3255 * dst and src will (rarely) point to the same context, in which case memcpy should be skipped.
3257 int (*update_thread_context)(AVCodecContext *dst, const AVCodecContext *src);
3261 * Private codec-specific defaults.
3263 const AVCodecDefault *defaults;
3266 * Initialize codec static data, called from avcodec_register().
3268 void (*init_static_data)(struct AVCodec *codec);
3270 int (*init)(AVCodecContext *);
3271 int (*encode_sub)(AVCodecContext *, uint8_t *buf, int buf_size,
3272 const struct AVSubtitle *sub);
3274 * Encode data to an AVPacket.
3276 * @param avctx codec context
3277 * @param avpkt output AVPacket (may contain a user-provided buffer)
3278 * @param[in] frame AVFrame containing the raw data to be encoded
3279 * @param[out] got_packet_ptr encoder sets to 0 or 1 to indicate that a
3280 * non-empty packet was returned in avpkt.
3281 * @return 0 on success, negative error code on failure
3283 int (*encode2)(AVCodecContext *avctx, AVPacket *avpkt, const AVFrame *frame,
3284 int *got_packet_ptr);
3285 int (*decode)(AVCodecContext *, void *outdata, int *outdata_size, AVPacket *avpkt);
3286 int (*close)(AVCodecContext *);
3289 * Will be called when seeking
3291 void (*flush)(AVCodecContext *);
3297 typedef struct AVHWAccel {
3299 * Name of the hardware accelerated codec.
3300 * The name is globally unique among encoders and among decoders (but an
3301 * encoder and a decoder can share the same name).
3306 * Type of codec implemented by the hardware accelerator.
3308 * See AVMEDIA_TYPE_xxx
3310 enum AVMediaType type;
3313 * Codec implemented by the hardware accelerator.
3315 * See AV_CODEC_ID_xxx
3320 * Supported pixel format.
3322 * Only hardware accelerated formats are supported here.
3324 enum AVPixelFormat pix_fmt;
3327 * Hardware accelerated codec capabilities.
3328 * see FF_HWACCEL_CODEC_CAP_*
3332 struct AVHWAccel *next;
3335 * Called at the beginning of each frame or field picture.
3337 * Meaningful frame information (codec specific) is guaranteed to
3338 * be parsed at this point. This function is mandatory.
3340 * Note that buf can be NULL along with buf_size set to 0.
3341 * Otherwise, this means the whole frame is available at this point.
3343 * @param avctx the codec context
3344 * @param buf the frame data buffer base
3345 * @param buf_size the size of the frame in bytes
3346 * @return zero if successful, a negative value otherwise
3348 int (*start_frame)(AVCodecContext *avctx, const uint8_t *buf, uint32_t buf_size);
3351 * Callback for each slice.
3353 * Meaningful slice information (codec specific) is guaranteed to
3354 * be parsed at this point. This function is mandatory.
3356 * @param avctx the codec context
3357 * @param buf the slice data buffer base
3358 * @param buf_size the size of the slice in bytes
3359 * @return zero if successful, a negative value otherwise
3361 int (*decode_slice)(AVCodecContext *avctx, const uint8_t *buf, uint32_t buf_size);
3364 * Called at the end of each frame or field picture.
3366 * The whole picture is parsed at this point and can now be sent
3367 * to the hardware accelerator. This function is mandatory.
3369 * @param avctx the codec context
3370 * @return zero if successful, a negative value otherwise
3372 int (*end_frame)(AVCodecContext *avctx);
3375 * Size of HW accelerator private data.
3377 * Private data is allocated with av_mallocz() before
3378 * AVCodecContext.get_buffer() and deallocated after
3379 * AVCodecContext.release_buffer().
3385 * @defgroup lavc_picture AVPicture
3387 * Functions for working with AVPicture
3392 * four components are given, that's all.
3393 * the last component is alpha
3395 typedef struct AVPicture {
3396 uint8_t *data[AV_NUM_DATA_POINTERS];
3397 int linesize[AV_NUM_DATA_POINTERS]; ///< number of bytes per line
3404 enum AVSubtitleType {
3407 SUBTITLE_BITMAP, ///< A bitmap, pict will be set
3410 * Plain text, the text field must be set by the decoder and is
3411 * authoritative. ass and pict fields may contain approximations.
3416 * Formatted text, the ass field must be set by the decoder and is
3417 * authoritative. pict and text fields may contain approximations.
3422 #define AV_SUBTITLE_FLAG_FORCED 0x00000001
3424 typedef struct AVSubtitleRect {
3425 int x; ///< top left corner of pict, undefined when pict is not set
3426 int y; ///< top left corner of pict, undefined when pict is not set
3427 int w; ///< width of pict, undefined when pict is not set
3428 int h; ///< height of pict, undefined when pict is not set
3429 int nb_colors; ///< number of colors in pict, undefined when pict is not set
3432 * data+linesize for the bitmap of this subtitle.
3433 * can be set for text/ass as well once they where rendered
3436 enum AVSubtitleType type;
3438 char *text; ///< 0 terminated plain UTF-8 text
3441 * 0 terminated ASS/SSA compatible event line.
3442 * The presentation of this is unaffected by the other values in this
3450 typedef struct AVSubtitle {
3451 uint16_t format; /* 0 = graphics */
3452 uint32_t start_display_time; /* relative to packet pts, in ms */
3453 uint32_t end_display_time; /* relative to packet pts, in ms */
3455 AVSubtitleRect **rects;
3456 int64_t pts; ///< Same as packet pts, in AV_TIME_BASE
3460 * If c is NULL, returns the first registered codec,
3461 * if c is non-NULL, returns the next registered codec after c,
3462 * or NULL if c is the last one.
3464 AVCodec *av_codec_next(const AVCodec *c);
3467 * Return the LIBAVCODEC_VERSION_INT constant.
3469 unsigned avcodec_version(void);
3472 * Return the libavcodec build-time configuration.
3474 const char *avcodec_configuration(void);
3477 * Return the libavcodec license.
3479 const char *avcodec_license(void);
3482 * Register the codec codec and initialize libavcodec.
3484 * @warning either this function or avcodec_register_all() must be called
3485 * before any other libavcodec functions.
3487 * @see avcodec_register_all()
3489 void avcodec_register(AVCodec *codec);
3492 * Register all the codecs, parsers and bitstream filters which were enabled at
3493 * configuration time. If you do not call this function you can select exactly
3494 * which formats you want to support, by using the individual registration
3497 * @see avcodec_register
3498 * @see av_register_codec_parser
3499 * @see av_register_bitstream_filter
3501 void avcodec_register_all(void);
3504 #if FF_API_ALLOC_CONTEXT
3506 * Allocate an AVCodecContext and set its fields to default values. The
3507 * resulting struct can be deallocated by simply calling av_free().
3509 * @return An AVCodecContext filled with default values or NULL on failure.
3510 * @see avcodec_get_context_defaults
3512 * @deprecated use avcodec_alloc_context3()
3514 attribute_deprecated
3515 AVCodecContext *avcodec_alloc_context(void);
3517 /** THIS FUNCTION IS NOT YET PART OF THE PUBLIC API!
3518 * we WILL change its arguments and name a few times! */
3519 attribute_deprecated
3520 AVCodecContext *avcodec_alloc_context2(enum AVMediaType);
3523 * Set the fields of the given AVCodecContext to default values.
3525 * @param s The AVCodecContext of which the fields should be set to default values.
3526 * @deprecated use avcodec_get_context_defaults3
3528 attribute_deprecated
3529 void avcodec_get_context_defaults(AVCodecContext *s);
3531 /** THIS FUNCTION IS NOT YET PART OF THE PUBLIC API!
3532 * we WILL change its arguments and name a few times! */
3533 attribute_deprecated
3534 void avcodec_get_context_defaults2(AVCodecContext *s, enum AVMediaType);
3538 * Allocate an AVCodecContext and set its fields to default values. The
3539 * resulting struct can be deallocated by calling avcodec_close() on it followed
3542 * @param codec if non-NULL, allocate private data and initialize defaults
3543 * for the given codec. It is illegal to then call avcodec_open2()
3544 * with a different codec.
3545 * If NULL, then the codec-specific defaults won't be initialized,
3546 * which may result in suboptimal default settings (this is
3547 * important mainly for encoders, e.g. libx264).
3549 * @return An AVCodecContext filled with default values or NULL on failure.
3550 * @see avcodec_get_context_defaults
3552 AVCodecContext *avcodec_alloc_context3(const AVCodec *codec);
3555 * Set the fields of the given AVCodecContext to default values corresponding
3556 * to the given codec (defaults may be codec-dependent).
3558 * Do not call this function if a non-NULL codec has been passed
3559 * to avcodec_alloc_context3() that allocated this AVCodecContext.
3560 * If codec is non-NULL, it is illegal to call avcodec_open2() with a
3561 * different codec on this AVCodecContext.
3563 int avcodec_get_context_defaults3(AVCodecContext *s, const AVCodec *codec);
3566 * Get the AVClass for AVCodecContext. It can be used in combination with
3567 * AV_OPT_SEARCH_FAKE_OBJ for examining options.
3569 * @see av_opt_find().
3571 const AVClass *avcodec_get_class(void);
3574 * Get the AVClass for AVFrame. It can be used in combination with
3575 * AV_OPT_SEARCH_FAKE_OBJ for examining options.
3577 * @see av_opt_find().
3579 const AVClass *avcodec_get_frame_class(void);
3582 * Get the AVClass for AVSubtitleRect. It can be used in combination with
3583 * AV_OPT_SEARCH_FAKE_OBJ for examining options.
3585 * @see av_opt_find().
3587 const AVClass *avcodec_get_subtitle_rect_class(void);
3590 * Copy the settings of the source AVCodecContext into the destination
3591 * AVCodecContext. The resulting destination codec context will be
3592 * unopened, i.e. you are required to call avcodec_open2() before you
3593 * can use this AVCodecContext to decode/encode video/audio data.
3595 * @param dest target codec context, should be initialized with
3596 * avcodec_alloc_context3(), but otherwise uninitialized
3597 * @param src source codec context
3598 * @return AVERROR() on error (e.g. memory allocation error), 0 on success
3600 int avcodec_copy_context(AVCodecContext *dest, const AVCodecContext *src);
3603 * Allocate an AVFrame and set its fields to default values. The resulting
3604 * struct must be freed using avcodec_free_frame().
3606 * @return An AVFrame filled with default values or NULL on failure.
3607 * @see avcodec_get_frame_defaults
3609 AVFrame *avcodec_alloc_frame(void);
3612 * Set the fields of the given AVFrame to default values.
3614 * @param frame The AVFrame of which the fields should be set to default values.
3616 void avcodec_get_frame_defaults(AVFrame *frame);
3619 * Free the frame and any dynamically allocated objects in it,
3620 * e.g. extended_data.
3622 * @param frame frame to be freed. The pointer will be set to NULL.
3624 * @warning this function does NOT free the data buffers themselves
3625 * (it does not know how, since they might have been allocated with
3626 * a custom get_buffer()).
3628 void avcodec_free_frame(AVFrame **frame);
3630 #if FF_API_AVCODEC_OPEN
3632 * Initialize the AVCodecContext to use the given AVCodec. Prior to using this
3633 * function the context has to be allocated.
3635 * The functions avcodec_find_decoder_by_name(), avcodec_find_encoder_by_name(),
3636 * avcodec_find_decoder() and avcodec_find_encoder() provide an easy way for
3637 * retrieving a codec.
3639 * @warning This function is not thread safe!
3642 * avcodec_register_all();
3643 * codec = avcodec_find_decoder(AV_CODEC_ID_H264);
3647 * context = avcodec_alloc_context3(codec);
3649 * if (avcodec_open(context, codec) < 0)
3653 * @param avctx The context which will be set up to use the given codec.
3654 * @param codec The codec to use within the context.
3655 * @return zero on success, a negative value on error
3656 * @see avcodec_alloc_context3, avcodec_find_decoder, avcodec_find_encoder, avcodec_close
3658 * @deprecated use avcodec_open2
3660 attribute_deprecated
3661 int avcodec_open(AVCodecContext *avctx, AVCodec *codec);
3665 * Initialize the AVCodecContext to use the given AVCodec. Prior to using this
3666 * function the context has to be allocated with avcodec_alloc_context3().
3668 * The functions avcodec_find_decoder_by_name(), avcodec_find_encoder_by_name(),
3669 * avcodec_find_decoder() and avcodec_find_encoder() provide an easy way for
3670 * retrieving a codec.
3672 * @warning This function is not thread safe!
3675 * avcodec_register_all();
3676 * av_dict_set(&opts, "b", "2.5M", 0);
3677 * codec = avcodec_find_decoder(AV_CODEC_ID_H264);
3681 * context = avcodec_alloc_context3(codec);
3683 * if (avcodec_open2(context, codec, opts) < 0)
3687 * @param avctx The context to initialize.
3688 * @param codec The codec to open this context for. If a non-NULL codec has been
3689 * previously passed to avcodec_alloc_context3() or
3690 * avcodec_get_context_defaults3() for this context, then this
3691 * parameter MUST be either NULL or equal to the previously passed
3693 * @param options A dictionary filled with AVCodecContext and codec-private options.
3694 * On return this object will be filled with options that were not found.
3696 * @return zero on success, a negative value on error
3697 * @see avcodec_alloc_context3(), avcodec_find_decoder(), avcodec_find_encoder(),
3698 * av_dict_set(), av_opt_find().
3700 int avcodec_open2(AVCodecContext *avctx, const AVCodec *codec, AVDictionary **options);
3703 * Close a given AVCodecContext and free all the data associated with it
3704 * (but not the AVCodecContext itself).
3706 * Calling this function on an AVCodecContext that hasn't been opened will free
3707 * the codec-specific data allocated in avcodec_alloc_context3() /
3708 * avcodec_get_context_defaults3() with a non-NULL codec. Subsequent calls will
3711 int avcodec_close(AVCodecContext *avctx);
3714 * Free all allocated data in the given subtitle struct.
3716 * @param sub AVSubtitle to free.
3718 void avsubtitle_free(AVSubtitle *sub);
3725 * @addtogroup lavc_packet
3730 * Default packet destructor.
3732 void av_destruct_packet(AVPacket *pkt);
3735 * Initialize optional fields of a packet with default values.
3737 * Note, this does not touch the data and size members, which have to be
3738 * initialized separately.
3742 void av_init_packet(AVPacket *pkt);
3745 * Allocate the payload of a packet and initialize its fields with
3749 * @param size wanted payload size
3750 * @return 0 if OK, AVERROR_xxx otherwise
3752 int av_new_packet(AVPacket *pkt, int size);
3755 * Reduce packet size, correctly zeroing padding
3758 * @param size new size
3760 void av_shrink_packet(AVPacket *pkt, int size);
3763 * Increase packet size, correctly zeroing padding
3766 * @param grow_by number of bytes by which to increase the size of the packet
3768 int av_grow_packet(AVPacket *pkt, int grow_by);
3771 * @warning This is a hack - the packet memory allocation stuff is broken. The
3772 * packet is allocated if it was not really allocated.
3774 int av_dup_packet(AVPacket *pkt);
3777 * Copy packet, including contents
3779 * @return 0 on success, negative AVERROR on fail
3781 int av_copy_packet(AVPacket *dst, AVPacket *src);
3786 * @param pkt packet to free
3788 void av_free_packet(AVPacket *pkt);
3791 * Allocate new information of a packet.
3794 * @param type side information type
3795 * @param size side information size
3796 * @return pointer to fresh allocated data or NULL otherwise
3798 uint8_t* av_packet_new_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
3802 * Shrink the already allocated side data buffer
3805 * @param type side information type
3806 * @param size new side information size
3807 * @return 0 on success, < 0 on failure
3809 int av_packet_shrink_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
3813 * Get side information from packet.
3816 * @param type desired side information type
3817 * @param size pointer for side information size to store (optional)
3818 * @return pointer to data if present or NULL otherwise
3820 uint8_t* av_packet_get_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
3823 int av_packet_merge_side_data(AVPacket *pkt);
3825 int av_packet_split_side_data(AVPacket *pkt);
3833 * @addtogroup lavc_decoding
3838 * Find a registered decoder with a matching codec ID.
3840 * @param id AVCodecID of the requested decoder
3841 * @return A decoder if one was found, NULL otherwise.
3843 AVCodec *avcodec_find_decoder(enum AVCodecID id);
3846 * Find a registered decoder with the specified name.
3848 * @param name name of the requested decoder
3849 * @return A decoder if one was found, NULL otherwise.
3851 AVCodec *avcodec_find_decoder_by_name(const char *name);
3853 int avcodec_default_get_buffer(AVCodecContext *s, AVFrame *pic);
3854 void avcodec_default_release_buffer(AVCodecContext *s, AVFrame *pic);
3855 int avcodec_default_reget_buffer(AVCodecContext *s, AVFrame *pic);
3858 * Return the amount of padding in pixels which the get_buffer callback must
3859 * provide around the edge of the image for codecs which do not have the
3860 * CODEC_FLAG_EMU_EDGE flag.
3862 * @return Required padding in pixels.
3864 unsigned avcodec_get_edge_width(void);
3867 * Modify width and height values so that they will result in a memory
3868 * buffer that is acceptable for the codec if you do not use any horizontal
3871 * May only be used if a codec with CODEC_CAP_DR1 has been opened.
3872 * If CODEC_FLAG_EMU_EDGE is not set, the dimensions must have been increased
3873 * according to avcodec_get_edge_width() before.
3875 void avcodec_align_dimensions(AVCodecContext *s, int *width, int *height);
3878 * Modify width and height values so that they will result in a memory
3879 * buffer that is acceptable for the codec if you also ensure that all
3880 * line sizes are a multiple of the respective linesize_align[i].
3882 * May only be used if a codec with CODEC_CAP_DR1 has been opened.
3883 * If CODEC_FLAG_EMU_EDGE is not set, the dimensions must have been increased
3884 * according to avcodec_get_edge_width() before.
3886 void avcodec_align_dimensions2(AVCodecContext *s, int *width, int *height,
3887 int linesize_align[AV_NUM_DATA_POINTERS]);
3889 #if FF_API_OLD_DECODE_AUDIO
3891 * Wrapper function which calls avcodec_decode_audio4.
3893 * @deprecated Use avcodec_decode_audio4 instead.
3895 * Decode the audio frame of size avpkt->size from avpkt->data into samples.
3896 * Some decoders may support multiple frames in a single AVPacket, such
3897 * decoders would then just decode the first frame. In this case,
3898 * avcodec_decode_audio3 has to be called again with an AVPacket that contains
3899 * the remaining data in order to decode the second frame etc.
3901 * could be outputted, frame_size_ptr is zero. Otherwise, it is the
3902 * decompressed frame size in bytes.
3904 * @warning You must set frame_size_ptr to the allocated size of the
3905 * output buffer before calling avcodec_decode_audio3().
3907 * @warning The input buffer must be FF_INPUT_BUFFER_PADDING_SIZE larger than
3908 * the actual read bytes because some optimized bitstream readers read 32 or 64
3909 * bits at once and could read over the end.
3911 * @warning The end of the input buffer avpkt->data should be set to 0 to ensure that
3912 * no overreading happens for damaged MPEG streams.
3914 * @warning You must not provide a custom get_buffer() when using
3915 * avcodec_decode_audio3(). Doing so will override it with
3916 * avcodec_default_get_buffer. Use avcodec_decode_audio4() instead,
3917 * which does allow the application to provide a custom get_buffer().
3919 * @note You might have to align the input buffer avpkt->data and output buffer
3920 * samples. The alignment requirements depend on the CPU: On some CPUs it isn't
3921 * necessary at all, on others it won't work at all if not aligned and on others
3922 * it will work but it will have an impact on performance.
3924 * In practice, avpkt->data should have 4 byte alignment at minimum and
3925 * samples should be 16 byte aligned unless the CPU doesn't need it
3926 * (AltiVec and SSE do).
3928 * @note Codecs which have the CODEC_CAP_DELAY capability set have a delay
3929 * between input and output, these need to be fed with avpkt->data=NULL,
3930 * avpkt->size=0 at the end to return the remaining frames.
3932 * @param avctx the codec context
3933 * @param[out] samples the output buffer, sample type in avctx->sample_fmt
3934 * If the sample format is planar, each channel plane will
3935 * be the same size, with no padding between channels.
3936 * @param[in,out] frame_size_ptr the output buffer size in bytes
3937 * @param[in] avpkt The input AVPacket containing the input buffer.
3938 * You can create such packet with av_init_packet() and by then setting
3939 * data and size, some decoders might in addition need other fields.
3940 * All decoders are designed to use the least fields possible though.
3941 * @return On error a negative value is returned, otherwise the number of bytes
3942 * used or zero if no frame data was decompressed (used) from the input AVPacket.
3944 attribute_deprecated int avcodec_decode_audio3(AVCodecContext *avctx, int16_t *samples,
3945 int *frame_size_ptr,
3950 * Decode the audio frame of size avpkt->size from avpkt->data into frame.
3952 * Some decoders may support multiple frames in a single AVPacket. Such
3953 * decoders would then just decode the first frame. In this case,
3954 * avcodec_decode_audio4 has to be called again with an AVPacket containing
3955 * the remaining data in order to decode the second frame, etc...
3956 * Even if no frames are returned, the packet needs to be fed to the decoder
3957 * with remaining data until it is completely consumed or an error occurs.
3959 * @warning The input buffer, avpkt->data must be FF_INPUT_BUFFER_PADDING_SIZE
3960 * larger than the actual read bytes because some optimized bitstream
3961 * readers read 32 or 64 bits at once and could read over the end.
3963 * @note You might have to align the input buffer. The alignment requirements
3964 * depend on the CPU and the decoder.
3966 * @param avctx the codec context
3967 * @param[out] frame The AVFrame in which to store decoded audio samples.
3968 * Decoders request a buffer of a particular size by setting
3969 * AVFrame.nb_samples prior to calling get_buffer(). The
3970 * decoder may, however, only utilize part of the buffer by
3971 * setting AVFrame.nb_samples to a smaller value in the
3973 * @param[out] got_frame_ptr Zero if no frame could be decoded, otherwise it is
3975 * @param[in] avpkt The input AVPacket containing the input buffer.
3976 * At least avpkt->data and avpkt->size should be set. Some
3977 * decoders might also require additional fields to be set.
3978 * @return A negative error code is returned if an error occurred during
3979 * decoding, otherwise the number of bytes consumed from the input
3980 * AVPacket is returned.
3982 int avcodec_decode_audio4(AVCodecContext *avctx, AVFrame *frame,
3983 int *got_frame_ptr, const AVPacket *avpkt);
3986 * Decode the video frame of size avpkt->size from avpkt->data into picture.
3987 * Some decoders may support multiple frames in a single AVPacket, such
3988 * decoders would then just decode the first frame.
3990 * @warning The input buffer must be FF_INPUT_BUFFER_PADDING_SIZE larger than
3991 * the actual read bytes because some optimized bitstream readers read 32 or 64
3992 * bits at once and could read over the end.
3994 * @warning The end of the input buffer buf should be set to 0 to ensure that
3995 * no overreading happens for damaged MPEG streams.
3997 * @note You might have to align the input buffer avpkt->data.
3998 * The alignment requirements depend on the CPU: on some CPUs it isn't
3999 * necessary at all, on others it won't work at all if not aligned and on others
4000 * it will work but it will have an impact on performance.
4002 * In practice, avpkt->data should have 4 byte alignment at minimum.
4004 * @note Codecs which have the CODEC_CAP_DELAY capability set have a delay
4005 * between input and output, these need to be fed with avpkt->data=NULL,
4006 * avpkt->size=0 at the end to return the remaining frames.
4008 * @param avctx the codec context
4009 * @param[out] picture The AVFrame in which the decoded video frame will be stored.
4010 * Use avcodec_alloc_frame to get an AVFrame, the codec will
4011 * allocate memory for the actual bitmap.
4012 * with default get/release_buffer(), the decoder frees/reuses the bitmap as it sees fit.
4013 * with overridden get/release_buffer() (needs CODEC_CAP_DR1) the user decides into what buffer the decoder
4014 * decodes and the decoder tells the user once it does not need the data anymore,
4015 * the user app can at this point free/reuse/keep the memory as it sees fit.
4017 * @param[in] avpkt The input AVpacket containing the input buffer.
4018 * You can create such packet with av_init_packet() and by then setting
4019 * data and size, some decoders might in addition need other fields like
4020 * flags&AV_PKT_FLAG_KEY. All decoders are designed to use the least
4022 * @param[in,out] got_picture_ptr Zero if no frame could be decompressed, otherwise, it is nonzero.
4023 * @return On error a negative value is returned, otherwise the number of bytes
4024 * used or zero if no frame could be decompressed.
4026 int avcodec_decode_video2(AVCodecContext *avctx, AVFrame *picture,
4027 int *got_picture_ptr,
4028 const AVPacket *avpkt);
4031 * Decode a subtitle message.
4032 * Return a negative value on error, otherwise return the number of bytes used.
4033 * If no subtitle could be decompressed, got_sub_ptr is zero.
4034 * Otherwise, the subtitle is stored in *sub.
4035 * Note that CODEC_CAP_DR1 is not available for subtitle codecs. This is for
4036 * simplicity, because the performance difference is expect to be negligible
4037 * and reusing a get_buffer written for video codecs would probably perform badly
4038 * due to a potentially very different allocation pattern.
4040 * @param avctx the codec context
4041 * @param[out] sub The AVSubtitle in which the decoded subtitle will be stored, must be
4042 freed with avsubtitle_free if *got_sub_ptr is set.
4043 * @param[in,out] got_sub_ptr Zero if no subtitle could be decompressed, otherwise, it is nonzero.
4044 * @param[in] avpkt The input AVPacket containing the input buffer.
4046 int avcodec_decode_subtitle2(AVCodecContext *avctx, AVSubtitle *sub,
4051 * @defgroup lavc_parsing Frame parsing
4055 typedef struct AVCodecParserContext {
4057 struct AVCodecParser *parser;
4058 int64_t frame_offset; /* offset of the current frame */
4059 int64_t cur_offset; /* current offset
4060 (incremented by each av_parser_parse()) */
4061 int64_t next_frame_offset; /* offset of the next frame */
4063 int pict_type; /* XXX: Put it back in AVCodecContext. */
4065 * This field is used for proper frame duration computation in lavf.
4066 * It signals, how much longer the frame duration of the current frame
4067 * is compared to normal frame duration.
4069 * frame_duration = (1 + repeat_pict) * time_base
4071 * It is used by codecs like H.264 to display telecined material.
4073 int repeat_pict; /* XXX: Put it back in AVCodecContext. */
4074 int64_t pts; /* pts of the current frame */
4075 int64_t dts; /* dts of the current frame */
4080 int fetch_timestamp;
4082 #define AV_PARSER_PTS_NB 4
4083 int cur_frame_start_index;
4084 int64_t cur_frame_offset[AV_PARSER_PTS_NB];
4085 int64_t cur_frame_pts[AV_PARSER_PTS_NB];
4086 int64_t cur_frame_dts[AV_PARSER_PTS_NB];
4089 #define PARSER_FLAG_COMPLETE_FRAMES 0x0001
4090 #define PARSER_FLAG_ONCE 0x0002
4091 /// Set if the parser has a valid file offset
4092 #define PARSER_FLAG_FETCHED_OFFSET 0x0004
4093 #define PARSER_FLAG_USE_CODEC_TS 0x1000
4095 int64_t offset; ///< byte offset from starting packet start
4096 int64_t cur_frame_end[AV_PARSER_PTS_NB];
4099 * Set by parser to 1 for key frames and 0 for non-key frames.
4100 * It is initialized to -1, so if the parser doesn't set this flag,
4101 * old-style fallback using AV_PICTURE_TYPE_I picture type as key frames
4107 * Time difference in stream time base units from the pts of this
4108 * packet to the point at which the output from the decoder has converged
4109 * independent from the availability of previous frames. That is, the
4110 * frames are virtually identical no matter if decoding started from
4111 * the very first frame or from this keyframe.
4112 * Is AV_NOPTS_VALUE if unknown.
4113 * This field is not the display duration of the current frame.
4114 * This field has no meaning if the packet does not have AV_PKT_FLAG_KEY
4117 * The purpose of this field is to allow seeking in streams that have no
4118 * keyframes in the conventional sense. It corresponds to the
4119 * recovery point SEI in H.264 and match_time_delta in NUT. It is also
4120 * essential for some types of subtitle streams to ensure that all
4121 * subtitles are correctly displayed after seeking.
4123 int64_t convergence_duration;
4125 // Timestamp generation support:
4127 * Synchronization point for start of timestamp generation.
4129 * Set to >0 for sync point, 0 for no sync point and <0 for undefined
4132 * For example, this corresponds to presence of H.264 buffering period
4138 * Offset of the current timestamp against last timestamp sync point in
4139 * units of AVCodecContext.time_base.
4141 * Set to INT_MIN when dts_sync_point unused. Otherwise, it must
4142 * contain a valid timestamp offset.
4144 * Note that the timestamp of sync point has usually a nonzero
4145 * dts_ref_dts_delta, which refers to the previous sync point. Offset of
4146 * the next frame after timestamp sync point will be usually 1.
4148 * For example, this corresponds to H.264 cpb_removal_delay.
4150 int dts_ref_dts_delta;
4153 * Presentation delay of current frame in units of AVCodecContext.time_base.
4155 * Set to INT_MIN when dts_sync_point unused. Otherwise, it must
4156 * contain valid non-negative timestamp delta (presentation time of a frame
4157 * must not lie in the past).
4159 * This delay represents the difference between decoding and presentation
4160 * time of the frame.
4162 * For example, this corresponds to H.264 dpb_output_delay.
4167 * Position of the packet in file.
4169 * Analogous to cur_frame_pts/dts
4171 int64_t cur_frame_pos[AV_PARSER_PTS_NB];
4174 * Byte position of currently parsed frame in stream.
4179 * Previous frame byte position.
4184 * Duration of the current frame.
4185 * For audio, this is in units of 1 / AVCodecContext.sample_rate.
4186 * For all other types, this is in units of AVCodecContext.time_base.
4189 } AVCodecParserContext;
4191 typedef struct AVCodecParser {
4192 int codec_ids[5]; /* several codec IDs are permitted */
4194 int (*parser_init)(AVCodecParserContext *s);
4195 int (*parser_parse)(AVCodecParserContext *s,
4196 AVCodecContext *avctx,
4197 const uint8_t **poutbuf, int *poutbuf_size,
4198 const uint8_t *buf, int buf_size);
4199 void (*parser_close)(AVCodecParserContext *s);
4200 int (*split)(AVCodecContext *avctx, const uint8_t *buf, int buf_size);
4201 struct AVCodecParser *next;
4204 AVCodecParser *av_parser_next(AVCodecParser *c);
4206 void av_register_codec_parser(AVCodecParser *parser);
4207 AVCodecParserContext *av_parser_init(int codec_id);
4212 * @param s parser context.
4213 * @param avctx codec context.
4214 * @param poutbuf set to pointer to parsed buffer or NULL if not yet finished.
4215 * @param poutbuf_size set to size of parsed buffer or zero if not yet finished.
4216 * @param buf input buffer.
4217 * @param buf_size input length, to signal EOF, this should be 0 (so that the last frame can be output).
4218 * @param pts input presentation timestamp.
4219 * @param dts input decoding timestamp.
4220 * @param pos input byte position in stream.
4221 * @return the number of bytes of the input bitstream used.
4226 * len = av_parser_parse2(myparser, AVCodecContext, &data, &size,
4233 * decode_frame(data, size);
4237 int av_parser_parse2(AVCodecParserContext *s,
4238 AVCodecContext *avctx,
4239 uint8_t **poutbuf, int *poutbuf_size,
4240 const uint8_t *buf, int buf_size,
4241 int64_t pts, int64_t dts,
4245 * @return 0 if the output buffer is a subset of the input, 1 if it is allocated and must be freed
4246 * @deprecated use AVBitstreamFilter
4248 int av_parser_change(AVCodecParserContext *s,
4249 AVCodecContext *avctx,
4250 uint8_t **poutbuf, int *poutbuf_size,
4251 const uint8_t *buf, int buf_size, int keyframe);
4252 void av_parser_close(AVCodecParserContext *s);
4260 * @addtogroup lavc_encoding
4265 * Find a registered encoder with a matching codec ID.
4267 * @param id AVCodecID of the requested encoder
4268 * @return An encoder if one was found, NULL otherwise.
4270 AVCodec *avcodec_find_encoder(enum AVCodecID id);
4273 * Find a registered encoder with the specified name.
4275 * @param name name of the requested encoder
4276 * @return An encoder if one was found, NULL otherwise.
4278 AVCodec *avcodec_find_encoder_by_name(const char *name);
4280 #if FF_API_OLD_ENCODE_AUDIO
4282 * Encode an audio frame from samples into buf.
4284 * @deprecated Use avcodec_encode_audio2 instead.
4286 * @note The output buffer should be at least FF_MIN_BUFFER_SIZE bytes large.
4287 * However, for codecs with avctx->frame_size equal to 0 (e.g. PCM) the user
4288 * will know how much space is needed because it depends on the value passed
4289 * in buf_size as described below. In that case a lower value can be used.
4291 * @param avctx the codec context
4292 * @param[out] buf the output buffer
4293 * @param[in] buf_size the output buffer size
4294 * @param[in] samples the input buffer containing the samples
4295 * The number of samples read from this buffer is frame_size*channels,
4296 * both of which are defined in avctx.
4297 * For codecs which have avctx->frame_size equal to 0 (e.g. PCM) the number of
4298 * samples read from samples is equal to:
4299 * buf_size * 8 / (avctx->channels * av_get_bits_per_sample(avctx->codec_id))
4300 * This also implies that av_get_bits_per_sample() must not return 0 for these
4302 * @return On error a negative value is returned, on success zero or the number
4303 * of bytes used to encode the data read from the input buffer.
4305 int attribute_deprecated avcodec_encode_audio(AVCodecContext *avctx,
4306 uint8_t *buf, int buf_size,
4307 const short *samples);
4311 * Encode a frame of audio.
4313 * Takes input samples from frame and writes the next output packet, if
4314 * available, to avpkt. The output packet does not necessarily contain data for
4315 * the most recent frame, as encoders can delay, split, and combine input frames
4316 * internally as needed.
4318 * @param avctx codec context
4319 * @param avpkt output AVPacket.
4320 * The user can supply an output buffer by setting
4321 * avpkt->data and avpkt->size prior to calling the
4322 * function, but if the size of the user-provided data is not
4323 * large enough, encoding will fail. If avpkt->data and
4324 * avpkt->size are set, avpkt->destruct must also be set. All
4325 * other AVPacket fields will be reset by the encoder using
4326 * av_init_packet(). If avpkt->data is NULL, the encoder will
4327 * allocate it. The encoder will set avpkt->size to the size
4328 * of the output packet.
4330 * If this function fails or produces no output, avpkt will be
4331 * freed using av_free_packet() (i.e. avpkt->destruct will be
4332 * called to free the user supplied buffer).
4333 * @param[in] frame AVFrame containing the raw audio data to be encoded.
4334 * May be NULL when flushing an encoder that has the
4335 * CODEC_CAP_DELAY capability set.
4336 * If CODEC_CAP_VARIABLE_FRAME_SIZE is set, then each frame
4337 * can have any number of samples.
4338 * If it is not set, frame->nb_samples must be equal to
4339 * avctx->frame_size for all frames except the last.
4340 * The final frame may be smaller than avctx->frame_size.
4341 * @param[out] got_packet_ptr This field is set to 1 by libavcodec if the
4342 * output packet is non-empty, and to 0 if it is
4343 * empty. If the function returns an error, the
4344 * packet can be assumed to be invalid, and the
4345 * value of got_packet_ptr is undefined and should
4347 * @return 0 on success, negative error code on failure
4349 int avcodec_encode_audio2(AVCodecContext *avctx, AVPacket *avpkt,
4350 const AVFrame *frame, int *got_packet_ptr);
4352 #if FF_API_OLD_ENCODE_VIDEO
4354 * @deprecated use avcodec_encode_video2() instead.
4356 * Encode a video frame from pict into buf.
4357 * The input picture should be
4358 * stored using a specific format, namely avctx.pix_fmt.
4360 * @param avctx the codec context
4361 * @param[out] buf the output buffer for the bitstream of encoded frame
4362 * @param[in] buf_size the size of the output buffer in bytes
4363 * @param[in] pict the input picture to encode
4364 * @return On error a negative value is returned, on success zero or the number
4365 * of bytes used from the output buffer.
4367 attribute_deprecated
4368 int avcodec_encode_video(AVCodecContext *avctx, uint8_t *buf, int buf_size,
4369 const AVFrame *pict);
4373 * Encode a frame of video.
4375 * Takes input raw video data from frame and writes the next output packet, if
4376 * available, to avpkt. The output packet does not necessarily contain data for
4377 * the most recent frame, as encoders can delay and reorder input frames
4378 * internally as needed.
4380 * @param avctx codec context
4381 * @param avpkt output AVPacket.
4382 * The user can supply an output buffer by setting
4383 * avpkt->data and avpkt->size prior to calling the
4384 * function, but if the size of the user-provided data is not
4385 * large enough, encoding will fail. All other AVPacket fields
4386 * will be reset by the encoder using av_init_packet(). If
4387 * avpkt->data is NULL, the encoder will allocate it.
4388 * The encoder will set avpkt->size to the size of the
4389 * output packet. The returned data (if any) belongs to the
4390 * caller, he is responsible for freeing it.
4392 * If this function fails or produces no output, avpkt will be
4393 * freed using av_free_packet() (i.e. avpkt->destruct will be
4394 * called to free the user supplied buffer).
4395 * @param[in] frame AVFrame containing the raw video data to be encoded.
4396 * May be NULL when flushing an encoder that has the
4397 * CODEC_CAP_DELAY capability set.
4398 * @param[out] got_packet_ptr This field is set to 1 by libavcodec if the
4399 * output packet is non-empty, and to 0 if it is
4400 * empty. If the function returns an error, the
4401 * packet can be assumed to be invalid, and the
4402 * value of got_packet_ptr is undefined and should
4404 * @return 0 on success, negative error code on failure
4406 int avcodec_encode_video2(AVCodecContext *avctx, AVPacket *avpkt,
4407 const AVFrame *frame, int *got_packet_ptr);
4409 int avcodec_encode_subtitle(AVCodecContext *avctx, uint8_t *buf, int buf_size,
4410 const AVSubtitle *sub);
4417 #if FF_API_AVCODEC_RESAMPLE
4419 * @defgroup lavc_resample Audio resampling
4421 * @deprecated use libswresample instead
4425 struct ReSampleContext;
4426 struct AVResampleContext;
4428 typedef struct ReSampleContext ReSampleContext;
4431 * Initialize audio resampling context.
4433 * @param output_channels number of output channels
4434 * @param input_channels number of input channels
4435 * @param output_rate output sample rate
4436 * @param input_rate input sample rate
4437 * @param sample_fmt_out requested output sample format
4438 * @param sample_fmt_in input sample format
4439 * @param filter_length length of each FIR filter in the filterbank relative to the cutoff frequency
4440 * @param log2_phase_count log2 of the number of entries in the polyphase filterbank
4441 * @param linear if 1 then the used FIR filter will be linearly interpolated
4442 between the 2 closest, if 0 the closest will be used
4443 * @param cutoff cutoff frequency, 1.0 corresponds to half the output sampling rate
4444 * @return allocated ReSampleContext, NULL if error occurred
4446 attribute_deprecated
4447 ReSampleContext *av_audio_resample_init(int output_channels, int input_channels,
4448 int output_rate, int input_rate,
4449 enum AVSampleFormat sample_fmt_out,
4450 enum AVSampleFormat sample_fmt_in,
4451 int filter_length, int log2_phase_count,
4452 int linear, double cutoff);
4454 attribute_deprecated
4455 int audio_resample(ReSampleContext *s, short *output, short *input, int nb_samples);
4458 * Free resample context.
4460 * @param s a non-NULL pointer to a resample context previously
4461 * created with av_audio_resample_init()
4463 attribute_deprecated
4464 void audio_resample_close(ReSampleContext *s);
4468 * Initialize an audio resampler.
4469 * Note, if either rate is not an integer then simply scale both rates up so they are.
4470 * @param filter_length length of each FIR filter in the filterbank relative to the cutoff freq
4471 * @param log2_phase_count log2 of the number of entries in the polyphase filterbank
4472 * @param linear If 1 then the used FIR filter will be linearly interpolated
4473 between the 2 closest, if 0 the closest will be used
4474 * @param cutoff cutoff frequency, 1.0 corresponds to half the output sampling rate
4476 attribute_deprecated
4477 struct AVResampleContext *av_resample_init(int out_rate, int in_rate, int filter_length, int log2_phase_count, int linear, double cutoff);
4480 * Resample an array of samples using a previously configured context.
4481 * @param src an array of unconsumed samples
4482 * @param consumed the number of samples of src which have been consumed are returned here
4483 * @param src_size the number of unconsumed samples available
4484 * @param dst_size the amount of space in samples available in dst
4485 * @param update_ctx If this is 0 then the context will not be modified, that way several channels can be resampled with the same context.
4486 * @return the number of samples written in dst or -1 if an error occurred
4488 attribute_deprecated
4489 int av_resample(struct AVResampleContext *c, short *dst, short *src, int *consumed, int src_size, int dst_size, int update_ctx);
4493 * Compensate samplerate/timestamp drift. The compensation is done by changing
4494 * the resampler parameters, so no audible clicks or similar distortions occur
4495 * @param compensation_distance distance in output samples over which the compensation should be performed
4496 * @param sample_delta number of output samples which should be output less
4498 * example: av_resample_compensate(c, 10, 500)
4499 * here instead of 510 samples only 500 samples would be output
4501 * note, due to rounding the actual compensation might be slightly different,
4502 * especially if the compensation_distance is large and the in_rate used during init is small
4504 attribute_deprecated
4505 void av_resample_compensate(struct AVResampleContext *c, int sample_delta, int compensation_distance);
4506 attribute_deprecated
4507 void av_resample_close(struct AVResampleContext *c);
4515 * @addtogroup lavc_picture
4520 * Allocate memory for a picture. Call avpicture_free() to free it.
4522 * @see avpicture_fill()
4524 * @param picture the picture to be filled in
4525 * @param pix_fmt the format of the picture
4526 * @param width the width of the picture
4527 * @param height the height of the picture
4528 * @return zero if successful, a negative value if not
4530 int avpicture_alloc(AVPicture *picture, enum AVPixelFormat pix_fmt, int width, int height);
4533 * Free a picture previously allocated by avpicture_alloc().
4534 * The data buffer used by the AVPicture is freed, but the AVPicture structure
4537 * @param picture the AVPicture to be freed
4539 void avpicture_free(AVPicture *picture);
4542 * Fill in the AVPicture fields, always assume a linesize alignment of
4545 * @see av_image_fill_arrays()
4547 int avpicture_fill(AVPicture *picture, const uint8_t *ptr,
4548 enum AVPixelFormat pix_fmt, int width, int height);
4551 * Copy pixel data from an AVPicture into a buffer, always assume a
4552 * linesize alignment of 1.
4554 * @see av_image_copy_to_buffer()
4556 int avpicture_layout(const AVPicture* src, enum AVPixelFormat pix_fmt,
4557 int width, int height,
4558 unsigned char *dest, int dest_size);
4561 * Calculate the size in bytes that a picture of the given width and height
4562 * would occupy if stored in the given picture format.
4563 * Always assume a linesize alignment of 1.
4565 * @see av_image_get_buffer_size().
4567 int avpicture_get_size(enum AVPixelFormat pix_fmt, int width, int height);
4570 * deinterlace - if not supported return -1
4572 int avpicture_deinterlace(AVPicture *dst, const AVPicture *src,
4573 enum AVPixelFormat pix_fmt, int width, int height);
4575 * Copy image src to dst. Wraps av_image_copy().
4577 void av_picture_copy(AVPicture *dst, const AVPicture *src,
4578 enum AVPixelFormat pix_fmt, int width, int height);
4581 * Crop image top and left side.
4583 int av_picture_crop(AVPicture *dst, const AVPicture *src,
4584 enum AVPixelFormat pix_fmt, int top_band, int left_band);
4589 int av_picture_pad(AVPicture *dst, const AVPicture *src, int height, int width, enum AVPixelFormat pix_fmt,
4590 int padtop, int padbottom, int padleft, int padright, int *color);
4597 * @defgroup lavc_misc Utility functions
4600 * Miscellaneous utility functions related to both encoding and decoding
4606 * @defgroup lavc_misc_pixfmt Pixel formats
4608 * Functions for working with pixel formats.
4613 * Utility function to access log2_chroma_w log2_chroma_h from
4614 * the pixel format AVPixFmtDescriptor.
4616 * This function asserts that pix_fmt is valid. See av_pix_fmt_get_chroma_sub_sample
4617 * for one that returns a failure code and continues in case of invalid
4620 * @param[in] pix_fmt the pixel format
4621 * @param[out] h_shift store log2_chroma_h
4622 * @param[out] v_shift store log2_chroma_w
4624 * @see av_pix_fmt_get_chroma_sub_sample
4627 void avcodec_get_chroma_sub_sample(enum AVPixelFormat pix_fmt, int *h_shift, int *v_shift);
4630 * Return a value representing the fourCC code associated to the
4631 * pixel format pix_fmt, or 0 if no associated fourCC code can be
4634 unsigned int avcodec_pix_fmt_to_codec_tag(enum AVPixelFormat pix_fmt);
4636 #define FF_LOSS_RESOLUTION 0x0001 /**< loss due to resolution change */
4637 #define FF_LOSS_DEPTH 0x0002 /**< loss due to color depth change */
4638 #define FF_LOSS_COLORSPACE 0x0004 /**< loss due to color space conversion */
4639 #define FF_LOSS_ALPHA 0x0008 /**< loss of alpha bits */
4640 #define FF_LOSS_COLORQUANT 0x0010 /**< loss due to color quantization */
4641 #define FF_LOSS_CHROMA 0x0020 /**< loss of chroma (e.g. RGB to gray conversion) */
4644 * Compute what kind of losses will occur when converting from one specific
4645 * pixel format to another.
4646 * When converting from one pixel format to another, information loss may occur.
4647 * For example, when converting from RGB24 to GRAY, the color information will
4648 * be lost. Similarly, other losses occur when converting from some formats to
4649 * other formats. These losses can involve loss of chroma, but also loss of
4650 * resolution, loss of color depth, loss due to the color space conversion, loss
4651 * of the alpha bits or loss due to color quantization.
4652 * avcodec_get_fix_fmt_loss() informs you about the various types of losses
4653 * which will occur when converting from one pixel format to another.
4655 * @param[in] dst_pix_fmt destination pixel format
4656 * @param[in] src_pix_fmt source pixel format
4657 * @param[in] has_alpha Whether the source pixel format alpha channel is used.
4658 * @return Combination of flags informing you what kind of losses will occur
4659 * (maximum loss for an invalid dst_pix_fmt).
4661 int avcodec_get_pix_fmt_loss(enum AVPixelFormat dst_pix_fmt, enum AVPixelFormat src_pix_fmt,
4664 #if FF_API_FIND_BEST_PIX_FMT
4666 * @deprecated use avcodec_find_best_pix_fmt_of_2() instead.
4668 * Find the best pixel format to convert to given a certain source pixel
4669 * format. When converting from one pixel format to another, information loss
4670 * may occur. For example, when converting from RGB24 to GRAY, the color
4671 * information will be lost. Similarly, other losses occur when converting from
4672 * some formats to other formats. avcodec_find_best_pix_fmt() searches which of
4673 * the given pixel formats should be used to suffer the least amount of loss.
4674 * The pixel formats from which it chooses one, are determined by the
4675 * pix_fmt_mask parameter.
4677 * Note, only the first 64 pixel formats will fit in pix_fmt_mask.
4680 * src_pix_fmt = AV_PIX_FMT_YUV420P;
4681 * pix_fmt_mask = (1 << AV_PIX_FMT_YUV422P) | (1 << AV_PIX_FMT_RGB24);
4682 * dst_pix_fmt = avcodec_find_best_pix_fmt(pix_fmt_mask, src_pix_fmt, alpha, &loss);
4685 * @param[in] pix_fmt_mask bitmask determining which pixel format to choose from
4686 * @param[in] src_pix_fmt source pixel format
4687 * @param[in] has_alpha Whether the source pixel format alpha channel is used.
4688 * @param[out] loss_ptr Combination of flags informing you what kind of losses will occur.
4689 * @return The best pixel format to convert to or -1 if none was found.
4691 attribute_deprecated
4692 enum AVPixelFormat avcodec_find_best_pix_fmt(int64_t pix_fmt_mask, enum AVPixelFormat src_pix_fmt,
4693 int has_alpha, int *loss_ptr);
4694 #endif /* FF_API_FIND_BEST_PIX_FMT */
4697 * Find the best pixel format to convert to given a certain source pixel
4698 * format. When converting from one pixel format to another, information loss
4699 * may occur. For example, when converting from RGB24 to GRAY, the color
4700 * information will be lost. Similarly, other losses occur when converting from
4701 * some formats to other formats. avcodec_find_best_pix_fmt_of_2() searches which of
4702 * the given pixel formats should be used to suffer the least amount of loss.
4703 * The pixel formats from which it chooses one, are determined by the
4704 * pix_fmt_list parameter.
4707 * @param[in] pix_fmt_list AV_PIX_FMT_NONE terminated array of pixel formats to choose from
4708 * @param[in] src_pix_fmt source pixel format
4709 * @param[in] has_alpha Whether the source pixel format alpha channel is used.
4710 * @param[out] loss_ptr Combination of flags informing you what kind of losses will occur.
4711 * @return The best pixel format to convert to or -1 if none was found.
4713 enum AVPixelFormat avcodec_find_best_pix_fmt_of_list(enum AVPixelFormat *pix_fmt_list,
4714 enum AVPixelFormat src_pix_fmt,
4715 int has_alpha, int *loss_ptr);
4718 * Find the best pixel format to convert to given a certain source pixel
4719 * format and a selection of two destination pixel formats. When converting from
4720 * one pixel format to another, information loss may occur. For example, when converting
4721 * from RGB24 to GRAY, the color information will be lost. Similarly, other losses occur when
4722 * converting from some formats to other formats. avcodec_find_best_pix_fmt_of_2() selects which of
4723 * the given pixel formats should be used to suffer the least amount of loss.
4725 * If one of the destination formats is AV_PIX_FMT_NONE the other pixel format (if valid) will be
4729 * src_pix_fmt = AV_PIX_FMT_YUV420P;
4730 * dst_pix_fmt1= AV_PIX_FMT_RGB24;
4731 * dst_pix_fmt2= AV_PIX_FMT_GRAY8;
4732 * dst_pix_fmt3= AV_PIX_FMT_RGB8;
4733 * loss= FF_LOSS_CHROMA; // don't care about chroma loss, so chroma loss will be ignored.
4734 * dst_pix_fmt = avcodec_find_best_pix_fmt_of_2(dst_pix_fmt1, dst_pix_fmt2, src_pix_fmt, alpha, &loss);
4735 * dst_pix_fmt = avcodec_find_best_pix_fmt_of_2(dst_pix_fmt, dst_pix_fmt3, src_pix_fmt, alpha, &loss);
4738 * @param[in] dst_pix_fmt1 One of the two destination pixel formats to choose from
4739 * @param[in] dst_pix_fmt2 The other of the two destination pixel formats to choose from
4740 * @param[in] src_pix_fmt Source pixel format
4741 * @param[in] has_alpha Whether the source pixel format alpha channel is used.
4742 * @param[in, out] loss_ptr Combination of loss flags. In: selects which of the losses to ignore, i.e.
4743 * NULL or value of zero means we care about all losses. Out: the loss
4744 * that occurs when converting from src to selected dst pixel format.
4745 * @return The best pixel format to convert to or -1 if none was found.
4747 enum AVPixelFormat avcodec_find_best_pix_fmt_of_2(enum AVPixelFormat dst_pix_fmt1, enum AVPixelFormat dst_pix_fmt2,
4748 enum AVPixelFormat src_pix_fmt, int has_alpha, int *loss_ptr);
4750 attribute_deprecated
4751 #if AV_HAVE_INCOMPATIBLE_FORK_ABI
4752 enum AVPixelFormat avcodec_find_best_pix_fmt2(enum AVPixelFormat *pix_fmt_list,
4753 enum AVPixelFormat src_pix_fmt,
4754 int has_alpha, int *loss_ptr);
4756 enum AVPixelFormat avcodec_find_best_pix_fmt2(enum AVPixelFormat dst_pix_fmt1, enum AVPixelFormat dst_pix_fmt2,
4757 enum AVPixelFormat src_pix_fmt, int has_alpha, int *loss_ptr);
4761 enum AVPixelFormat avcodec_default_get_format(struct AVCodecContext *s, const enum AVPixelFormat * fmt);
4767 void avcodec_set_dimensions(AVCodecContext *s, int width, int height);
4770 * Put a string representing the codec tag codec_tag in buf.
4772 * @param buf_size size in bytes of buf
4773 * @return the length of the string that would have been generated if
4774 * enough space had been available, excluding the trailing null
4776 size_t av_get_codec_tag_string(char *buf, size_t buf_size, unsigned int codec_tag);
4778 void avcodec_string(char *buf, int buf_size, AVCodecContext *enc, int encode);
4781 * Return a name for the specified profile, if available.
4783 * @param codec the codec that is searched for the given profile
4784 * @param profile the profile value for which a name is requested
4785 * @return A name for the profile if found, NULL otherwise.
4787 const char *av_get_profile_name(const AVCodec *codec, int profile);
4789 int avcodec_default_execute(AVCodecContext *c, int (*func)(AVCodecContext *c2, void *arg2),void *arg, int *ret, int count, int size);
4790 int avcodec_default_execute2(AVCodecContext *c, int (*func)(AVCodecContext *c2, void *arg2, int, int),void *arg, int *ret, int count);
4791 //FIXME func typedef
4794 * Fill AVFrame audio data and linesize pointers.
4796 * The buffer buf must be a preallocated buffer with a size big enough
4797 * to contain the specified samples amount. The filled AVFrame data
4798 * pointers will point to this buffer.
4800 * AVFrame extended_data channel pointers are allocated if necessary for
4803 * @param frame the AVFrame
4804 * frame->nb_samples must be set prior to calling the
4805 * function. This function fills in frame->data,
4806 * frame->extended_data, frame->linesize[0].
4807 * @param nb_channels channel count
4808 * @param sample_fmt sample format
4809 * @param buf buffer to use for frame data
4810 * @param buf_size size of buffer
4811 * @param align plane size sample alignment (0 = default)
4812 * @return >=0 on success, negative error code on failure
4813 * @todo return the size in bytes required to store the samples in
4814 * case of success, at the next libavutil bump
4816 int avcodec_fill_audio_frame(AVFrame *frame, int nb_channels,
4817 enum AVSampleFormat sample_fmt, const uint8_t *buf,
4818 int buf_size, int align);
4821 * Flush buffers, should be called when seeking or when switching to a different stream.
4823 void avcodec_flush_buffers(AVCodecContext *avctx);
4825 void avcodec_default_free_buffers(AVCodecContext *s);
4828 * Return codec bits per sample.
4830 * @param[in] codec_id the codec
4831 * @return Number of bits per sample or zero if unknown for the given codec.
4833 int av_get_bits_per_sample(enum AVCodecID codec_id);
4836 * Return the PCM codec associated with a sample format.
4837 * @param be endianness, 0 for little, 1 for big,
4838 * -1 (or anything else) for native
4839 * @return AV_CODEC_ID_PCM_* or AV_CODEC_ID_NONE
4841 enum AVCodecID av_get_pcm_codec(enum AVSampleFormat fmt, int be);
4844 * Return codec bits per sample.
4845 * Only return non-zero if the bits per sample is exactly correct, not an
4848 * @param[in] codec_id the codec
4849 * @return Number of bits per sample or zero if unknown for the given codec.
4851 int av_get_exact_bits_per_sample(enum AVCodecID codec_id);
4854 * Return audio frame duration.
4856 * @param avctx codec context
4857 * @param frame_bytes size of the frame, or 0 if unknown
4858 * @return frame duration, in samples, if known. 0 if not able to
4861 int av_get_audio_frame_duration(AVCodecContext *avctx, int frame_bytes);
4864 typedef struct AVBitStreamFilterContext {
4866 struct AVBitStreamFilter *filter;
4867 AVCodecParserContext *parser;
4868 struct AVBitStreamFilterContext *next;
4869 } AVBitStreamFilterContext;
4872 typedef struct AVBitStreamFilter {
4875 int (*filter)(AVBitStreamFilterContext *bsfc,
4876 AVCodecContext *avctx, const char *args,
4877 uint8_t **poutbuf, int *poutbuf_size,
4878 const uint8_t *buf, int buf_size, int keyframe);
4879 void (*close)(AVBitStreamFilterContext *bsfc);
4880 struct AVBitStreamFilter *next;
4881 } AVBitStreamFilter;
4883 void av_register_bitstream_filter(AVBitStreamFilter *bsf);
4884 AVBitStreamFilterContext *av_bitstream_filter_init(const char *name);
4885 int av_bitstream_filter_filter(AVBitStreamFilterContext *bsfc,
4886 AVCodecContext *avctx, const char *args,
4887 uint8_t **poutbuf, int *poutbuf_size,
4888 const uint8_t *buf, int buf_size, int keyframe);
4889 void av_bitstream_filter_close(AVBitStreamFilterContext *bsf);
4891 AVBitStreamFilter *av_bitstream_filter_next(AVBitStreamFilter *f);
4896 * Reallocate the given block if it is not large enough, otherwise do nothing.
4900 void *av_fast_realloc(void *ptr, unsigned int *size, size_t min_size);
4903 * Allocate a buffer, reusing the given one if large enough.
4905 * Contrary to av_fast_realloc the current buffer contents might not be
4906 * preserved and on error the old buffer is freed, thus no special
4907 * handling to avoid memleaks is necessary.
4909 * @param ptr pointer to pointer to already allocated buffer, overwritten with pointer to new buffer
4910 * @param size size of the buffer *ptr points to
4911 * @param min_size minimum size of *ptr buffer after returning, *ptr will be NULL and
4912 * *size 0 if an error occurred.
4914 void av_fast_malloc(void *ptr, unsigned int *size, size_t min_size);
4917 * Same behaviour av_fast_malloc but the buffer has additional
4918 * FF_INPUT_PADDING_SIZE at the end which will will always be 0.
4920 * In addition the whole buffer will initially and after resizes
4921 * be 0-initialized so that no uninitialized data will ever appear.
4923 void av_fast_padded_malloc(void *ptr, unsigned int *size, size_t min_size);
4926 * Same behaviour av_fast_padded_malloc except that buffer will always
4927 * be 0-initialized after call.
4929 void av_fast_padded_mallocz(void *ptr, unsigned int *size, size_t min_size);
4932 * Encode extradata length to a buffer. Used by xiph codecs.
4934 * @param s buffer to write to; must be at least (v/255+1) bytes long
4935 * @param v size of extradata in bytes
4936 * @return number of bytes written to the buffer.
4938 unsigned int av_xiphlacing(unsigned char *s, unsigned int v);
4941 * Log a generic warning message about a missing feature. This function is
4942 * intended to be used internally by FFmpeg (libavcodec, libavformat, etc.)
4943 * only, and would normally not be used by applications.
4944 * @param[in] avc a pointer to an arbitrary struct of which the first field is
4945 * a pointer to an AVClass struct
4946 * @param[in] feature string containing the name of the missing feature
4947 * @param[in] want_sample indicates if samples are wanted which exhibit this feature.
4948 * If want_sample is non-zero, additional verbage will be added to the log
4949 * message which tells the user how to report samples to the development
4952 void av_log_missing_feature(void *avc, const char *feature, int want_sample);
4955 * Log a generic warning message asking for a sample. This function is
4956 * intended to be used internally by FFmpeg (libavcodec, libavformat, etc.)
4957 * only, and would normally not be used by applications.
4958 * @param[in] avc a pointer to an arbitrary struct of which the first field is
4959 * a pointer to an AVClass struct
4960 * @param[in] msg string containing an optional message, or NULL if no message
4962 void av_log_ask_for_sample(void *avc, const char *msg, ...) av_printf_format(2, 3);
4965 * Register the hardware accelerator hwaccel.
4967 void av_register_hwaccel(AVHWAccel *hwaccel);
4970 * If hwaccel is NULL, returns the first registered hardware accelerator,
4971 * if hwaccel is non-NULL, returns the next registered hardware accelerator
4972 * after hwaccel, or NULL if hwaccel is the last one.
4974 AVHWAccel *av_hwaccel_next(AVHWAccel *hwaccel);
4978 * Lock operation used by lockmgr
4981 AV_LOCK_CREATE, ///< Create a mutex
4982 AV_LOCK_OBTAIN, ///< Lock the mutex
4983 AV_LOCK_RELEASE, ///< Unlock the mutex
4984 AV_LOCK_DESTROY, ///< Free mutex resources
4988 * Register a user provided lock manager supporting the operations
4989 * specified by AVLockOp. mutex points to a (void *) where the
4990 * lockmgr should store/get a pointer to a user allocated mutex. It's
4991 * NULL upon AV_LOCK_CREATE and != NULL for all other ops.
4993 * @param cb User defined callback. Note: FFmpeg may invoke calls to this
4994 * callback during the call to av_lockmgr_register().
4995 * Thus, the application must be prepared to handle that.
4996 * If cb is set to NULL the lockmgr will be unregistered.
4997 * Also note that during unregistration the previously registered
4998 * lockmgr callback may also be invoked.
5000 int av_lockmgr_register(int (*cb)(void **mutex, enum AVLockOp op));
5003 * Get the type of the given codec.
5005 enum AVMediaType avcodec_get_type(enum AVCodecID codec_id);
5008 * Get the name of a codec.
5009 * @return a static string identifying the codec; never NULL
5011 const char *avcodec_get_name(enum AVCodecID id);
5014 * @return a positive value if s is open (i.e. avcodec_open2() was called on it
5015 * with no corresponding avcodec_close()), 0 otherwise.
5017 int avcodec_is_open(AVCodecContext *s);
5020 * @return a non-zero number if codec is an encoder, zero otherwise
5022 int av_codec_is_encoder(const AVCodec *codec);
5025 * @return a non-zero number if codec is a decoder, zero otherwise
5027 int av_codec_is_decoder(const AVCodec *codec);
5030 * @return descriptor for given codec ID or NULL if no descriptor exists.
5032 const AVCodecDescriptor *avcodec_descriptor_get(enum AVCodecID id);
5035 * Iterate over all codec descriptors known to libavcodec.
5037 * @param prev previous descriptor. NULL to get the first descriptor.
5039 * @return next descriptor or NULL after the last descriptor
5041 const AVCodecDescriptor *avcodec_descriptor_next(const AVCodecDescriptor *prev);
5044 * @return codec descriptor with the given name or NULL if no such descriptor
5047 const AVCodecDescriptor *avcodec_descriptor_get_by_name(const char *name);
5053 #endif /* AVCODEC_AVCODEC_H */