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_Y41P = MKBETAG('Y','4','1','P'),
271 AV_CODEC_ID_ESCAPE130 = MKBETAG('E','1','3','0'),
272 AV_CODEC_ID_EXR = MKBETAG('0','E','X','R'),
273 AV_CODEC_ID_AVRP = MKBETAG('A','V','R','P'),
275 AV_CODEC_ID_G2M = MKBETAG( 0 ,'G','2','M'),
276 AV_CODEC_ID_AVUI = MKBETAG('A','V','U','I'),
277 AV_CODEC_ID_AYUV = MKBETAG('A','Y','U','V'),
278 AV_CODEC_ID_TARGA_Y216 = MKBETAG('T','2','1','6'),
279 AV_CODEC_ID_V308 = MKBETAG('V','3','0','8'),
280 AV_CODEC_ID_V408 = MKBETAG('V','4','0','8'),
281 AV_CODEC_ID_YUV4 = MKBETAG('Y','U','V','4'),
282 AV_CODEC_ID_SANM = MKBETAG('S','A','N','M'),
283 AV_CODEC_ID_PAF_VIDEO = MKBETAG('P','A','F','V'),
284 AV_CODEC_ID_AVRN = MKBETAG('A','V','R','n'),
285 AV_CODEC_ID_CPIA = MKBETAG('C','P','I','A'),
286 AV_CODEC_ID_XFACE = MKBETAG('X','F','A','C'),
288 /* various PCM "codecs" */
289 AV_CODEC_ID_FIRST_AUDIO = 0x10000, ///< A dummy id pointing at the start of audio codecs
290 AV_CODEC_ID_PCM_S16LE = 0x10000,
291 AV_CODEC_ID_PCM_S16BE,
292 AV_CODEC_ID_PCM_U16LE,
293 AV_CODEC_ID_PCM_U16BE,
296 AV_CODEC_ID_PCM_MULAW,
297 AV_CODEC_ID_PCM_ALAW,
298 AV_CODEC_ID_PCM_S32LE,
299 AV_CODEC_ID_PCM_S32BE,
300 AV_CODEC_ID_PCM_U32LE,
301 AV_CODEC_ID_PCM_U32BE,
302 AV_CODEC_ID_PCM_S24LE,
303 AV_CODEC_ID_PCM_S24BE,
304 AV_CODEC_ID_PCM_U24LE,
305 AV_CODEC_ID_PCM_U24BE,
306 AV_CODEC_ID_PCM_S24DAUD,
307 AV_CODEC_ID_PCM_ZORK,
308 AV_CODEC_ID_PCM_S16LE_PLANAR,
310 AV_CODEC_ID_PCM_F32BE,
311 AV_CODEC_ID_PCM_F32LE,
312 AV_CODEC_ID_PCM_F64BE,
313 AV_CODEC_ID_PCM_F64LE,
314 AV_CODEC_ID_PCM_BLURAY,
317 AV_CODEC_ID_PCM_S8_PLANAR,
318 AV_CODEC_ID_PCM_S24LE_PLANAR = MKBETAG(24,'P','S','P'),
319 AV_CODEC_ID_PCM_S32LE_PLANAR = MKBETAG(32,'P','S','P'),
320 AV_CODEC_ID_PCM_S16BE_PLANAR = MKBETAG('P','S','P',16),
322 /* various ADPCM codecs */
323 AV_CODEC_ID_ADPCM_IMA_QT = 0x11000,
324 AV_CODEC_ID_ADPCM_IMA_WAV,
325 AV_CODEC_ID_ADPCM_IMA_DK3,
326 AV_CODEC_ID_ADPCM_IMA_DK4,
327 AV_CODEC_ID_ADPCM_IMA_WS,
328 AV_CODEC_ID_ADPCM_IMA_SMJPEG,
329 AV_CODEC_ID_ADPCM_MS,
330 AV_CODEC_ID_ADPCM_4XM,
331 AV_CODEC_ID_ADPCM_XA,
332 AV_CODEC_ID_ADPCM_ADX,
333 AV_CODEC_ID_ADPCM_EA,
334 AV_CODEC_ID_ADPCM_G726,
335 AV_CODEC_ID_ADPCM_CT,
336 AV_CODEC_ID_ADPCM_SWF,
337 AV_CODEC_ID_ADPCM_YAMAHA,
338 AV_CODEC_ID_ADPCM_SBPRO_4,
339 AV_CODEC_ID_ADPCM_SBPRO_3,
340 AV_CODEC_ID_ADPCM_SBPRO_2,
341 AV_CODEC_ID_ADPCM_THP,
342 AV_CODEC_ID_ADPCM_IMA_AMV,
343 AV_CODEC_ID_ADPCM_EA_R1,
344 AV_CODEC_ID_ADPCM_EA_R3,
345 AV_CODEC_ID_ADPCM_EA_R2,
346 AV_CODEC_ID_ADPCM_IMA_EA_SEAD,
347 AV_CODEC_ID_ADPCM_IMA_EA_EACS,
348 AV_CODEC_ID_ADPCM_EA_XAS,
349 AV_CODEC_ID_ADPCM_EA_MAXIS_XA,
350 AV_CODEC_ID_ADPCM_IMA_ISS,
351 AV_CODEC_ID_ADPCM_G722,
352 AV_CODEC_ID_ADPCM_IMA_APC,
353 AV_CODEC_ID_VIMA = MKBETAG('V','I','M','A'),
356 AV_CODEC_ID_AMR_NB = 0x12000,
359 /* RealAudio codecs*/
360 AV_CODEC_ID_RA_144 = 0x13000,
363 /* various DPCM codecs */
364 AV_CODEC_ID_ROQ_DPCM = 0x14000,
365 AV_CODEC_ID_INTERPLAY_DPCM,
366 AV_CODEC_ID_XAN_DPCM,
367 AV_CODEC_ID_SOL_DPCM,
370 AV_CODEC_ID_MP2 = 0x15000,
371 AV_CODEC_ID_MP3, ///< preferred ID for decoding MPEG audio layer 1, 2 or 3
381 AV_CODEC_ID_VMDAUDIO,
387 AV_CODEC_ID_WESTWOOD_SND1,
388 AV_CODEC_ID_GSM, ///< as in Berlin toast format
391 AV_CODEC_ID_TRUESPEECH,
393 AV_CODEC_ID_SMACKAUDIO,
396 AV_CODEC_ID_DSICINAUDIO,
398 AV_CODEC_ID_MUSEPACK7,
400 AV_CODEC_ID_GSM_MS, /* as found in WAV */
404 AV_CODEC_ID_NELLYMOSER,
405 AV_CODEC_ID_MUSEPACK8,
407 AV_CODEC_ID_WMAVOICE,
409 AV_CODEC_ID_WMALOSSLESS,
418 AV_CODEC_ID_BINKAUDIO_RDFT,
419 AV_CODEC_ID_BINKAUDIO_DCT,
420 AV_CODEC_ID_AAC_LATM,
425 AV_CODEC_ID_8SVX_EXP,
426 AV_CODEC_ID_8SVX_FIB,
427 AV_CODEC_ID_BMV_AUDIO,
431 AV_CODEC_ID_OPUS_DEPRECATED,
432 AV_CODEC_ID_COMFORT_NOISE,
433 AV_CODEC_ID_FFWAVESYNTH = MKBETAG('F','F','W','S'),
434 AV_CODEC_ID_8SVX_RAW = MKBETAG('8','S','V','X'),
435 AV_CODEC_ID_SONIC = MKBETAG('S','O','N','C'),
436 AV_CODEC_ID_SONIC_LS = MKBETAG('S','O','N','L'),
437 AV_CODEC_ID_PAF_AUDIO = MKBETAG('P','A','F','A'),
438 AV_CODEC_ID_OPUS = MKBETAG('O','P','U','S'),
439 AV_CODEC_ID_TAK = MKBETAG('t','B','a','K'),
441 /* subtitle codecs */
442 AV_CODEC_ID_FIRST_SUBTITLE = 0x17000, ///< A dummy ID pointing at the start of subtitle codecs.
443 AV_CODEC_ID_DVD_SUBTITLE = 0x17000,
444 AV_CODEC_ID_DVB_SUBTITLE,
445 AV_CODEC_ID_TEXT, ///< raw UTF-8 text
448 AV_CODEC_ID_MOV_TEXT,
449 AV_CODEC_ID_HDMV_PGS_SUBTITLE,
450 AV_CODEC_ID_DVB_TELETEXT,
452 AV_CODEC_ID_MICRODVD = MKBETAG('m','D','V','D'),
453 AV_CODEC_ID_EIA_608 = MKBETAG('c','6','0','8'),
454 AV_CODEC_ID_JACOSUB = MKBETAG('J','S','U','B'),
455 AV_CODEC_ID_SAMI = MKBETAG('S','A','M','I'),
456 AV_CODEC_ID_REALTEXT = MKBETAG('R','T','X','T'),
457 AV_CODEC_ID_SUBVIEWER = MKBETAG('S','u','b','V'),
458 AV_CODEC_ID_SUBRIP = MKBETAG('S','R','i','p'),
459 AV_CODEC_ID_WEBVTT = MKBETAG('W','V','T','T'),
461 /* other specific kind of codecs (generally used for attachments) */
462 AV_CODEC_ID_FIRST_UNKNOWN = 0x18000, ///< A dummy ID pointing at the start of various fake codecs.
463 AV_CODEC_ID_TTF = 0x18000,
464 AV_CODEC_ID_BINTEXT = MKBETAG('B','T','X','T'),
465 AV_CODEC_ID_XBIN = MKBETAG('X','B','I','N'),
466 AV_CODEC_ID_IDF = MKBETAG( 0 ,'I','D','F'),
467 AV_CODEC_ID_OTF = MKBETAG( 0 ,'O','T','F'),
469 AV_CODEC_ID_PROBE = 0x19000, ///< codec_id is not known (like AV_CODEC_ID_NONE) but lavf should attempt to identify it
471 AV_CODEC_ID_MPEG2TS = 0x20000, /**< _FAKE_ codec to indicate a raw MPEG-2 TS
472 * stream (only used by libavformat) */
473 AV_CODEC_ID_MPEG4SYSTEMS = 0x20001, /**< _FAKE_ codec to indicate a MPEG-4 Systems
474 * stream (only used by libavformat) */
475 AV_CODEC_ID_FFMETADATA = 0x21000, ///< Dummy codec for streams containing only metadata information.
478 #include "old_codec_ids.h"
483 #define CodecID AVCodecID
487 * This struct describes the properties of a single codec described by an
489 * @see avcodec_get_descriptor()
491 typedef struct AVCodecDescriptor {
493 enum AVMediaType type;
495 * Name of the codec described by this descriptor. It is non-empty and
496 * unique for each codec descriptor. It should contain alphanumeric
497 * characters and '_' only.
501 * A more descriptive name for this codec. May be NULL.
503 const char *long_name;
505 * Codec properties, a combination of AV_CODEC_PROP_* flags.
511 * Codec uses only intra compression.
514 #define AV_CODEC_PROP_INTRA_ONLY (1 << 0)
516 * Codec supports lossy compression. Audio and video codecs only.
517 * @note a codec may support both lossy and lossless
520 #define AV_CODEC_PROP_LOSSY (1 << 1)
522 * Codec supports lossless compression. Audio and video codecs only.
524 #define AV_CODEC_PROP_LOSSLESS (1 << 2)
526 #if FF_API_OLD_DECODE_AUDIO
528 #define AVCODEC_MAX_AUDIO_FRAME_SIZE 192000 // 1 second of 48khz 32bit audio
532 * @ingroup lavc_decoding
533 * Required number of additionally allocated bytes at the end of the input bitstream for decoding.
534 * This is mainly needed because some optimized bitstream readers read
535 * 32 or 64 bit at once and could read over the end.<br>
536 * Note: If the first 23 bits of the additional bytes are not 0, then damaged
537 * MPEG bitstreams could cause overread and segfault.
539 #define FF_INPUT_BUFFER_PADDING_SIZE 16
542 * @ingroup lavc_encoding
543 * minimum encoding buffer size
544 * Used to avoid some checks during header writing.
546 #define FF_MIN_BUFFER_SIZE 16384
550 * @ingroup lavc_encoding
551 * motion estimation type.
554 ME_ZERO = 1, ///< no search, that is use 0,0 vector whenever one is needed
558 ME_EPZS, ///< enhanced predictive zonal search
559 ME_X1, ///< reserved for experiments
560 ME_HEX, ///< hexagon based search
561 ME_UMH, ///< uneven multi-hexagon search
562 ME_ITER, ///< iterative search
563 ME_TESA, ///< transformed exhaustive search algorithm
567 * @ingroup lavc_decoding
570 /* We leave some space between them for extensions (drop some
571 * keyframes for intra-only or drop just some bidir frames). */
572 AVDISCARD_NONE =-16, ///< discard nothing
573 AVDISCARD_DEFAULT = 0, ///< discard useless packets like 0 size packets in avi
574 AVDISCARD_NONREF = 8, ///< discard all non reference
575 AVDISCARD_BIDIR = 16, ///< discard all bidirectional frames
576 AVDISCARD_NONKEY = 32, ///< discard all frames except keyframes
577 AVDISCARD_ALL = 48, ///< discard all
580 enum AVColorPrimaries{
581 AVCOL_PRI_BT709 = 1, ///< also ITU-R BT1361 / IEC 61966-2-4 / SMPTE RP177 Annex B
582 AVCOL_PRI_UNSPECIFIED = 2,
583 AVCOL_PRI_BT470M = 4,
584 AVCOL_PRI_BT470BG = 5, ///< also ITU-R BT601-6 625 / ITU-R BT1358 625 / ITU-R BT1700 625 PAL & SECAM
585 AVCOL_PRI_SMPTE170M = 6, ///< also ITU-R BT601-6 525 / ITU-R BT1358 525 / ITU-R BT1700 NTSC
586 AVCOL_PRI_SMPTE240M = 7, ///< functionally identical to above
588 AVCOL_PRI_NB , ///< Not part of ABI
591 enum AVColorTransferCharacteristic{
592 AVCOL_TRC_BT709 = 1, ///< also ITU-R BT1361
593 AVCOL_TRC_UNSPECIFIED = 2,
594 AVCOL_TRC_GAMMA22 = 4, ///< also ITU-R BT470M / ITU-R BT1700 625 PAL & SECAM
595 AVCOL_TRC_GAMMA28 = 5, ///< also ITU-R BT470BG
596 AVCOL_TRC_SMPTE240M = 7,
597 AVCOL_TRC_NB , ///< Not part of ABI
602 AVCOL_SPC_BT709 = 1, ///< also ITU-R BT1361 / IEC 61966-2-4 xvYCC709 / SMPTE RP177 Annex B
603 AVCOL_SPC_UNSPECIFIED = 2,
605 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
606 AVCOL_SPC_SMPTE170M = 6, ///< also ITU-R BT601-6 525 / ITU-R BT1358 525 / ITU-R BT1700 NTSC / functionally identical to above
607 AVCOL_SPC_SMPTE240M = 7,
608 AVCOL_SPC_YCOCG = 8, ///< Used by Dirac / VC-2 and H.264 FRext, see ITU-T SG16
609 AVCOL_SPC_NB , ///< Not part of ABI
611 #define AVCOL_SPC_YCGCO AVCOL_SPC_YCOCG
614 AVCOL_RANGE_UNSPECIFIED = 0,
615 AVCOL_RANGE_MPEG = 1, ///< the normal 219*2^(n-8) "MPEG" YUV ranges
616 AVCOL_RANGE_JPEG = 2, ///< the normal 2^n-1 "JPEG" YUV ranges
617 AVCOL_RANGE_NB , ///< Not part of ABI
621 * X X 3 4 X X are luma samples,
622 * 1 2 1-6 are possible chroma positions
623 * X X 5 6 X 0 is undefined/unknown position
625 enum AVChromaLocation{
626 AVCHROMA_LOC_UNSPECIFIED = 0,
627 AVCHROMA_LOC_LEFT = 1, ///< mpeg2/4, h264 default
628 AVCHROMA_LOC_CENTER = 2, ///< mpeg1, jpeg, h263
629 AVCHROMA_LOC_TOPLEFT = 3, ///< DV
630 AVCHROMA_LOC_TOP = 4,
631 AVCHROMA_LOC_BOTTOMLEFT = 5,
632 AVCHROMA_LOC_BOTTOM = 6,
633 AVCHROMA_LOC_NB , ///< Not part of ABI
636 enum AVAudioServiceType {
637 AV_AUDIO_SERVICE_TYPE_MAIN = 0,
638 AV_AUDIO_SERVICE_TYPE_EFFECTS = 1,
639 AV_AUDIO_SERVICE_TYPE_VISUALLY_IMPAIRED = 2,
640 AV_AUDIO_SERVICE_TYPE_HEARING_IMPAIRED = 3,
641 AV_AUDIO_SERVICE_TYPE_DIALOGUE = 4,
642 AV_AUDIO_SERVICE_TYPE_COMMENTARY = 5,
643 AV_AUDIO_SERVICE_TYPE_EMERGENCY = 6,
644 AV_AUDIO_SERVICE_TYPE_VOICE_OVER = 7,
645 AV_AUDIO_SERVICE_TYPE_KARAOKE = 8,
646 AV_AUDIO_SERVICE_TYPE_NB , ///< Not part of ABI
650 * @ingroup lavc_encoding
652 typedef struct RcOverride{
655 int qscale; // If this is 0 then quality_factor will be used instead.
656 float quality_factor;
659 #define FF_MAX_B_FRAMES 16
662 These flags can be passed in AVCodecContext.flags before initialization.
663 Note: Not everything is supported yet.
666 #define CODEC_FLAG_QSCALE 0x0002 ///< Use fixed qscale.
667 #define CODEC_FLAG_4MV 0x0004 ///< 4 MV per MB allowed / advanced prediction for H.263.
668 #define CODEC_FLAG_QPEL 0x0010 ///< Use qpel MC.
669 #define CODEC_FLAG_GMC 0x0020 ///< Use GMC.
670 #define CODEC_FLAG_MV0 0x0040 ///< Always try a MB with MV=<0,0>.
672 * The parent program guarantees that the input for B-frames containing
673 * streams is not written to for at least s->max_b_frames+1 frames, if
674 * this is not set the input will be copied.
676 #define CODEC_FLAG_INPUT_PRESERVED 0x0100
677 #define CODEC_FLAG_PASS1 0x0200 ///< Use internal 2pass ratecontrol in first pass mode.
678 #define CODEC_FLAG_PASS2 0x0400 ///< Use internal 2pass ratecontrol in second pass mode.
679 #define CODEC_FLAG_GRAY 0x2000 ///< Only decode/encode grayscale.
680 #define CODEC_FLAG_EMU_EDGE 0x4000 ///< Don't draw edges.
681 #define CODEC_FLAG_PSNR 0x8000 ///< error[?] variables will be set during encoding.
682 #define CODEC_FLAG_TRUNCATED 0x00010000 /** Input bitstream might be truncated at a random
683 location instead of only at frame boundaries. */
684 #define CODEC_FLAG_NORMALIZE_AQP 0x00020000 ///< Normalize adaptive quantization.
685 #define CODEC_FLAG_INTERLACED_DCT 0x00040000 ///< Use interlaced DCT.
686 #define CODEC_FLAG_LOW_DELAY 0x00080000 ///< Force low delay.
687 #define CODEC_FLAG_GLOBAL_HEADER 0x00400000 ///< Place global headers in extradata instead of every keyframe.
688 #define CODEC_FLAG_BITEXACT 0x00800000 ///< Use only bitexact stuff (except (I)DCT).
689 /* Fx : Flag for h263+ extra options */
690 #define CODEC_FLAG_AC_PRED 0x01000000 ///< H.263 advanced intra coding / MPEG-4 AC prediction
691 #define CODEC_FLAG_LOOP_FILTER 0x00000800 ///< loop filter
692 #define CODEC_FLAG_INTERLACED_ME 0x20000000 ///< interlaced motion estimation
693 #define CODEC_FLAG_CLOSED_GOP 0x80000000
694 #define CODEC_FLAG2_FAST 0x00000001 ///< Allow non spec compliant speedup tricks.
695 #define CODEC_FLAG2_NO_OUTPUT 0x00000004 ///< Skip bitstream encoding.
696 #define CODEC_FLAG2_LOCAL_HEADER 0x00000008 ///< Place global headers at every keyframe instead of in extradata.
697 #define CODEC_FLAG2_DROP_FRAME_TIMECODE 0x00002000 ///< timecode is in drop frame format. DEPRECATED!!!!
698 #if FF_API_MPV_GLOBAL_OPTS
699 #define CODEC_FLAG_CBP_RD 0x04000000 ///< Use rate distortion optimization for cbp.
700 #define CODEC_FLAG_QP_RD 0x08000000 ///< Use rate distortion optimization for qp selectioon.
701 #define CODEC_FLAG2_STRICT_GOP 0x00000002 ///< Strictly enforce GOP size.
702 #define CODEC_FLAG2_SKIP_RD 0x00004000 ///< RD optimal MB level residual skipping
704 #define CODEC_FLAG2_CHUNKS 0x00008000 ///< Input bitstream might be truncated at a packet boundaries instead of only at frame boundaries.
705 #define CODEC_FLAG2_SHOW_ALL 0x00400000 ///< Show all frames before the first keyframe
707 /* Unsupported options :
708 * Syntax Arithmetic coding (SAC)
709 * Reference Picture Selection
710 * Independent Segment Decoding */
712 /* codec capabilities */
714 #define CODEC_CAP_DRAW_HORIZ_BAND 0x0001 ///< Decoder can use draw_horiz_band callback.
716 * Codec uses get_buffer() for allocating buffers and supports custom allocators.
717 * If not set, it might not use get_buffer() at all or use operations that
718 * assume the buffer was allocated by avcodec_default_get_buffer.
720 #define CODEC_CAP_DR1 0x0002
721 #define CODEC_CAP_TRUNCATED 0x0008
722 /* Codec can export data for HW decoding (XvMC). */
723 #define CODEC_CAP_HWACCEL 0x0010
725 * Encoder or decoder requires flushing with NULL input at the end in order to
726 * give the complete and correct output.
728 * NOTE: If this flag is not set, the codec is guaranteed to never be fed with
729 * with NULL data. The user can still send NULL data to the public encode
730 * or decode function, but libavcodec will not pass it along to the codec
731 * unless this flag is set.
734 * The decoder has a non-zero delay and needs to be fed with avpkt->data=NULL,
735 * avpkt->size=0 at the end to get the delayed data until the decoder no longer
739 * The encoder needs to be fed with NULL data at the end of encoding until the
740 * encoder no longer returns data.
742 * NOTE: For encoders implementing the AVCodec.encode2() function, setting this
743 * flag also means that the encoder must set the pts and duration for
744 * each output packet. If this flag is not set, the pts and duration will
745 * be determined by libavcodec from the input frame.
747 #define CODEC_CAP_DELAY 0x0020
749 * Codec can be fed a final frame with a smaller size.
750 * This can be used to prevent truncation of the last audio samples.
752 #define CODEC_CAP_SMALL_LAST_FRAME 0x0040
754 * Codec can export data for HW decoding (VDPAU).
756 #define CODEC_CAP_HWACCEL_VDPAU 0x0080
758 * Codec can output multiple frames per AVPacket
759 * Normally demuxers return one frame at a time, demuxers which do not do
760 * are connected to a parser to split what they return into proper frames.
761 * This flag is reserved to the very rare category of codecs which have a
762 * bitstream that cannot be split into frames without timeconsuming
763 * operations like full decoding. Demuxers carring such bitstreams thus
764 * may return multiple frames in a packet. This has many disadvantages like
765 * prohibiting stream copy in many cases thus it should only be considered
768 #define CODEC_CAP_SUBFRAMES 0x0100
770 * Codec is experimental and is thus avoided in favor of non experimental
773 #define CODEC_CAP_EXPERIMENTAL 0x0200
775 * Codec should fill in channel configuration and samplerate instead of container
777 #define CODEC_CAP_CHANNEL_CONF 0x0400
780 * Codec is able to deal with negative linesizes
782 #define CODEC_CAP_NEG_LINESIZES 0x0800
785 * Codec supports frame-level multithreading.
787 #define CODEC_CAP_FRAME_THREADS 0x1000
789 * Codec supports slice-based (or partition-based) multithreading.
791 #define CODEC_CAP_SLICE_THREADS 0x2000
793 * Codec supports changed parameters at any point.
795 #define CODEC_CAP_PARAM_CHANGE 0x4000
797 * Codec supports avctx->thread_count == 0 (auto).
799 #define CODEC_CAP_AUTO_THREADS 0x8000
801 * Audio encoder supports receiving a different number of samples in each call.
803 #define CODEC_CAP_VARIABLE_FRAME_SIZE 0x10000
805 * Codec is intra only.
807 #define CODEC_CAP_INTRA_ONLY 0x40000000
811 #define CODEC_CAP_LOSSLESS 0x80000000
813 //The following defines may change, don't expect compatibility if you use them.
814 #define MB_TYPE_INTRA4x4 0x0001
815 #define MB_TYPE_INTRA16x16 0x0002 //FIXME H.264-specific
816 #define MB_TYPE_INTRA_PCM 0x0004 //FIXME H.264-specific
817 #define MB_TYPE_16x16 0x0008
818 #define MB_TYPE_16x8 0x0010
819 #define MB_TYPE_8x16 0x0020
820 #define MB_TYPE_8x8 0x0040
821 #define MB_TYPE_INTERLACED 0x0080
822 #define MB_TYPE_DIRECT2 0x0100 //FIXME
823 #define MB_TYPE_ACPRED 0x0200
824 #define MB_TYPE_GMC 0x0400
825 #define MB_TYPE_SKIP 0x0800
826 #define MB_TYPE_P0L0 0x1000
827 #define MB_TYPE_P1L0 0x2000
828 #define MB_TYPE_P0L1 0x4000
829 #define MB_TYPE_P1L1 0x8000
830 #define MB_TYPE_L0 (MB_TYPE_P0L0 | MB_TYPE_P1L0)
831 #define MB_TYPE_L1 (MB_TYPE_P0L1 | MB_TYPE_P1L1)
832 #define MB_TYPE_L0L1 (MB_TYPE_L0 | MB_TYPE_L1)
833 #define MB_TYPE_QUANT 0x00010000
834 #define MB_TYPE_CBP 0x00020000
835 //Note bits 24-31 are reserved for codec specific use (h264 ref0, mpeg1 0mv, ...)
839 * This specifies the area which should be displayed.
840 * Note there may be multiple such areas for one frame.
842 typedef struct AVPanScan{
845 * - encoding: Set by user.
846 * - decoding: Set by libavcodec.
851 * width and height in 1/16 pel
852 * - encoding: Set by user.
853 * - decoding: Set by libavcodec.
859 * position of the top left corner in 1/16 pel for up to 3 fields/frames
860 * - encoding: Set by user.
861 * - decoding: Set by libavcodec.
863 int16_t position[3][2];
866 #define FF_QSCALE_TYPE_MPEG1 0
867 #define FF_QSCALE_TYPE_MPEG2 1
868 #define FF_QSCALE_TYPE_H264 2
869 #define FF_QSCALE_TYPE_VP56 3
871 #define FF_BUFFER_TYPE_INTERNAL 1
872 #define FF_BUFFER_TYPE_USER 2 ///< direct rendering buffers (image is (de)allocated by user)
873 #define FF_BUFFER_TYPE_SHARED 4 ///< Buffer from somewhere else; don't deallocate image (data/base), all other tables are not shared.
874 #define FF_BUFFER_TYPE_COPY 8 ///< Just a (modified) copy of some other buffer, don't deallocate anything.
876 #define FF_BUFFER_HINTS_VALID 0x01 // Buffer hints value is meaningful (if 0 ignore).
877 #define FF_BUFFER_HINTS_READABLE 0x02 // Codec will read from buffer.
878 #define FF_BUFFER_HINTS_PRESERVE 0x04 // User must not alter buffer content.
879 #define FF_BUFFER_HINTS_REUSABLE 0x08 // Codec will reuse the buffer (update).
882 * @defgroup lavc_packet AVPacket
884 * Types and functions for working with AVPacket.
887 enum AVPacketSideDataType {
889 AV_PKT_DATA_NEW_EXTRADATA,
892 * An AV_PKT_DATA_PARAM_CHANGE side data packet is laid out as follows:
895 * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_COUNT)
896 * s32le channel_count
897 * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_LAYOUT)
898 * u64le channel_layout
899 * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_SAMPLE_RATE)
901 * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_DIMENSIONS)
906 AV_PKT_DATA_PARAM_CHANGE,
909 * An AV_PKT_DATA_H263_MB_INFO side data packet contains a number of
910 * structures with info about macroblocks relevant to splitting the
911 * packet into smaller packets on macroblock edges (e.g. as for RFC 2190).
912 * That is, it does not necessarily contain info about all macroblocks,
913 * as long as the distance between macroblocks in the info is smaller
914 * than the target payload size.
915 * Each MB info structure is 12 bytes, and is laid out as follows:
917 * u32le bit offset from the start of the packet
918 * u8 current quantizer at the start of the macroblock
920 * u16le macroblock address within the GOB
921 * u8 horizontal MV predictor
922 * u8 vertical MV predictor
923 * u8 horizontal MV predictor for block number 3
924 * u8 vertical MV predictor for block number 3
927 AV_PKT_DATA_H263_MB_INFO,
930 * Recommmends skipping the specified number of samples
932 * u32le number of samples to skip from start of this packet
933 * u32le number of samples to skip from end of this packet
934 * u8 reason for start skip
935 * u8 reason for end skip (0=padding silence, 1=convergence)
938 AV_PKT_DATA_SKIP_SAMPLES=70,
941 * An AV_PKT_DATA_JP_DUALMONO side data packet indicates that
942 * the packet may contain "dual mono" audio specific to Japanese DTV
943 * and if it is true, recommends only the selected channel to be used.
945 * u8 selected channels (0=mail/left, 1=sub/right, 2=both)
948 AV_PKT_DATA_JP_DUALMONO,
951 * A list of zero terminated key/value strings. There is no end marker for
952 * the list, so it is required to rely on the side data size to stop.
954 AV_PKT_DATA_STRINGS_METADATA,
957 * Subtitle event position
965 AV_PKT_DATA_SUBTITLE_POSITION,
969 * This structure stores compressed data. It is typically exported by demuxers
970 * and then passed as input to decoders, or received as output from encoders and
971 * then passed to muxers.
973 * For video, it should typically contain one compressed frame. For audio it may
974 * contain several compressed frames.
976 * AVPacket is one of the few structs in FFmpeg, whose size is a part of public
977 * ABI. Thus it may be allocated on stack and no new fields can be added to it
978 * without libavcodec and libavformat major bump.
980 * The semantics of data ownership depends on the destruct field.
981 * If it is set, the packet data is dynamically allocated and is valid
982 * indefinitely until av_free_packet() is called (which in turn calls the
983 * destruct callback to free the data). If destruct is not set, the packet data
984 * is typically backed by some static buffer somewhere and is only valid for a
985 * limited time (e.g. until the next read call when demuxing).
987 * The side data is always allocated with av_malloc() and is freed in
990 typedef struct AVPacket {
992 * Presentation timestamp in AVStream->time_base units; the time at which
993 * the decompressed packet will be presented to the user.
994 * Can be AV_NOPTS_VALUE if it is not stored in the file.
995 * pts MUST be larger or equal to dts as presentation cannot happen before
996 * decompression, unless one wants to view hex dumps. Some formats misuse
997 * the terms dts and pts/cts to mean something different. Such timestamps
998 * must be converted to true pts/dts before they are stored in AVPacket.
1002 * Decompression timestamp in AVStream->time_base units; the time at which
1003 * the packet is decompressed.
1004 * Can be AV_NOPTS_VALUE if it is not stored in the file.
1011 * A combination of AV_PKT_FLAG values
1015 * Additional packet data that can be provided by the container.
1016 * Packet can contain several types of side information.
1021 enum AVPacketSideDataType type;
1023 int side_data_elems;
1026 * Duration of this packet in AVStream->time_base units, 0 if unknown.
1027 * Equals next_pts - this_pts in presentation order.
1030 void (*destruct)(struct AVPacket *);
1032 int64_t pos; ///< byte position in stream, -1 if unknown
1035 * Time difference in AVStream->time_base units from the pts of this
1036 * packet to the point at which the output from the decoder has converged
1037 * independent from the availability of previous frames. That is, the
1038 * frames are virtually identical no matter if decoding started from
1039 * the very first frame or from this keyframe.
1040 * Is AV_NOPTS_VALUE if unknown.
1041 * This field is not the display duration of the current packet.
1042 * This field has no meaning if the packet does not have AV_PKT_FLAG_KEY
1045 * The purpose of this field is to allow seeking in streams that have no
1046 * keyframes in the conventional sense. It corresponds to the
1047 * recovery point SEI in H.264 and match_time_delta in NUT. It is also
1048 * essential for some types of subtitle streams to ensure that all
1049 * subtitles are correctly displayed after seeking.
1051 int64_t convergence_duration;
1053 #define AV_PKT_FLAG_KEY 0x0001 ///< The packet contains a keyframe
1054 #define AV_PKT_FLAG_CORRUPT 0x0002 ///< The packet content is corrupted
1056 enum AVSideDataParamChangeFlags {
1057 AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_COUNT = 0x0001,
1058 AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_LAYOUT = 0x0002,
1059 AV_SIDE_DATA_PARAM_CHANGE_SAMPLE_RATE = 0x0004,
1060 AV_SIDE_DATA_PARAM_CHANGE_DIMENSIONS = 0x0008,
1067 * Audio Video Frame.
1068 * New fields can be added to the end of AVFRAME with minor version
1069 * bumps. Similarly fields that are marked as to be only accessed by
1070 * av_opt_ptr() can be reordered. This allows 2 forks to add fields
1071 * without breaking compatibility with each other.
1072 * Removal, reordering and changes in the remaining cases require
1073 * a major version bump.
1074 * sizeof(AVFrame) must not be used outside libavcodec.
1076 typedef struct AVFrame {
1077 #define AV_NUM_DATA_POINTERS 8
1079 * pointer to the picture/channel planes.
1080 * This might be different from the first allocated byte
1081 * - encoding: Set by user
1082 * - decoding: set by AVCodecContext.get_buffer()
1084 uint8_t *data[AV_NUM_DATA_POINTERS];
1087 * Size, in bytes, of the data for each picture/channel plane.
1089 * For audio, only linesize[0] may be set. For planar audio, each channel
1090 * plane must be the same size.
1092 * - encoding: Set by user
1093 * - decoding: set by AVCodecContext.get_buffer()
1095 int linesize[AV_NUM_DATA_POINTERS];
1098 * pointers to the data planes/channels.
1100 * For video, this should simply point to data[].
1102 * For planar audio, each channel has a separate data pointer, and
1103 * linesize[0] contains the size of each channel buffer.
1104 * For packed audio, there is just one data pointer, and linesize[0]
1105 * contains the total size of the buffer for all channels.
1107 * Note: Both data and extended_data will always be set by get_buffer(),
1108 * but for planar audio with more channels that can fit in data,
1109 * extended_data must be used by the decoder in order to access all
1112 * encoding: set by user
1113 * decoding: set by AVCodecContext.get_buffer()
1115 uint8_t **extended_data;
1118 * width and height of the video frame
1119 * - encoding: unused
1120 * - decoding: Read by user.
1125 * number of audio samples (per channel) described by this frame
1126 * - encoding: Set by user
1127 * - decoding: Set by libavcodec
1132 * format of the frame, -1 if unknown or unset
1133 * Values correspond to enum AVPixelFormat for video frames,
1134 * enum AVSampleFormat for audio)
1135 * - encoding: unused
1136 * - decoding: Read by user.
1141 * 1 -> keyframe, 0-> not
1142 * - encoding: Set by libavcodec.
1143 * - decoding: Set by libavcodec.
1148 * Picture type of the frame, see ?_TYPE below.
1149 * - encoding: Set by libavcodec. for coded_picture (and set by user for input).
1150 * - decoding: Set by libavcodec.
1152 enum AVPictureType pict_type;
1155 * pointer to the first allocated byte of the picture. Can be used in get_buffer/release_buffer.
1156 * This isn't used by libavcodec unless the default get/release_buffer() is used.
1160 uint8_t *base[AV_NUM_DATA_POINTERS];
1163 * sample aspect ratio for the video frame, 0/1 if unknown/unspecified
1164 * - encoding: unused
1165 * - decoding: Read by user.
1167 AVRational sample_aspect_ratio;
1170 * presentation timestamp in time_base units (time when frame should be shown to user)
1171 * If AV_NOPTS_VALUE then frame_rate = 1/time_base will be assumed.
1172 * - encoding: MUST be set by user.
1173 * - decoding: Set by libavcodec.
1178 * reordered pts from the last AVPacket that has been input into the decoder
1179 * - encoding: unused
1180 * - decoding: Read by user.
1185 * dts from the last AVPacket that has been input into the decoder
1186 * - encoding: unused
1187 * - decoding: Read by user.
1192 * picture number in bitstream order
1193 * - encoding: set by
1194 * - decoding: Set by libavcodec.
1196 int coded_picture_number;
1198 * picture number in display order
1199 * - encoding: set by
1200 * - decoding: Set by libavcodec.
1202 int display_picture_number;
1205 * quality (between 1 (good) and FF_LAMBDA_MAX (bad))
1206 * - encoding: Set by libavcodec. for coded_picture (and set by user for input).
1207 * - decoding: Set by libavcodec.
1212 * is this picture used as reference
1213 * The values for this are the same as the MpegEncContext.picture_structure
1214 * variable, that is 1->top field, 2->bottom field, 3->frame/both fields.
1215 * Set to 4 for delayed, non-reference frames.
1216 * - encoding: unused
1217 * - decoding: Set by libavcodec. (before get_buffer() call)).
1223 * - encoding: unused
1224 * - decoding: Set by libavcodec.
1226 int8_t *qscale_table;
1229 * - encoding: unused
1230 * - decoding: Set by libavcodec.
1240 * mbskip_table[mb]>=1 if MB didn't change
1241 * stride= mb_width = (width+15)>>4
1242 * - encoding: unused
1243 * - decoding: Set by libavcodec.
1245 uint8_t *mbskip_table;
1248 * motion vector table
1251 * int mv_sample_log2= 4 - motion_subsample_log2;
1252 * int mb_width= (width+15)>>4;
1253 * int mv_stride= (mb_width << mv_sample_log2) + 1;
1254 * motion_val[direction][x + y*mv_stride][0->mv_x, 1->mv_y];
1256 * - encoding: Set by user.
1257 * - decoding: Set by libavcodec.
1259 int16_t (*motion_val[2])[2];
1262 * macroblock type table
1263 * mb_type_base + mb_width + 2
1264 * - encoding: Set by user.
1265 * - decoding: Set by libavcodec.
1271 * - encoding: unused
1272 * - decoding: Set by libavcodec.
1277 * motion reference frame index
1278 * the order in which these are stored can depend on the codec.
1279 * - encoding: Set by user.
1280 * - decoding: Set by libavcodec.
1282 int8_t *ref_index[2];
1285 * for some private data of the user
1286 * - encoding: unused
1287 * - decoding: Set by user.
1293 * - encoding: Set by libavcodec. if flags&CODEC_FLAG_PSNR.
1294 * - decoding: unused
1296 uint64_t error[AV_NUM_DATA_POINTERS];
1299 * type of the buffer (to keep track of who has to deallocate data[*])
1300 * - encoding: Set by the one who allocates it.
1301 * - decoding: Set by the one who allocates it.
1302 * Note: User allocated (direct rendering) & internal buffers cannot coexist currently.
1307 * When decoding, this signals how much the picture must be delayed.
1308 * extra_delay = repeat_pict / (2*fps)
1309 * - encoding: unused
1310 * - decoding: Set by libavcodec.
1315 * The content of the picture is interlaced.
1316 * - encoding: Set by user.
1317 * - decoding: Set by libavcodec. (default 0)
1319 int interlaced_frame;
1322 * If the content is interlaced, is top field displayed first.
1323 * - encoding: Set by user.
1324 * - decoding: Set by libavcodec.
1326 int top_field_first;
1329 * Tell user application that palette has changed from previous frame.
1330 * - encoding: ??? (no palette-enabled encoder yet)
1331 * - decoding: Set by libavcodec. (default 0).
1333 int palette_has_changed;
1336 * codec suggestion on buffer type if != 0
1337 * - encoding: unused
1338 * - decoding: Set by libavcodec. (before get_buffer() call)).
1344 * - encoding: Set by user.
1345 * - decoding: Set by libavcodec.
1347 AVPanScan *pan_scan;
1350 * reordered opaque 64bit (generally an integer or a double precision float
1351 * PTS but can be anything).
1352 * The user sets AVCodecContext.reordered_opaque to represent the input at
1354 * the decoder reorders values as needed and sets AVFrame.reordered_opaque
1355 * to exactly one of the values provided by the user through AVCodecContext.reordered_opaque
1356 * @deprecated in favor of pkt_pts
1357 * - encoding: unused
1358 * - decoding: Read by user.
1360 int64_t reordered_opaque;
1363 * hardware accelerator private data (FFmpeg-allocated)
1364 * - encoding: unused
1365 * - decoding: Set by libavcodec
1367 void *hwaccel_picture_private;
1370 * the AVCodecContext which ff_thread_get_buffer() was last called on
1371 * - encoding: Set by libavcodec.
1372 * - decoding: Set by libavcodec.
1374 struct AVCodecContext *owner;
1377 * used by multithreading to store frame-specific info
1378 * - encoding: Set by libavcodec.
1379 * - decoding: Set by libavcodec.
1381 void *thread_opaque;
1384 * log2 of the size of the block which a single vector in motion_val represents:
1385 * (4->16x16, 3->8x8, 2-> 4x4, 1-> 2x2)
1386 * - encoding: unused
1387 * - decoding: Set by libavcodec.
1389 uint8_t motion_subsample_log2;
1392 * Sample rate of the audio data.
1394 * - encoding: unused
1395 * - decoding: read by user
1400 * Channel layout of the audio data.
1402 * - encoding: unused
1403 * - decoding: read by user.
1405 uint64_t channel_layout;
1408 * frame timestamp estimated using various heuristics, in stream time base
1409 * Code outside libavcodec should access this field using:
1410 * av_frame_get_best_effort_timestamp(frame)
1411 * - encoding: unused
1412 * - decoding: set by libavcodec, read by user.
1414 int64_t best_effort_timestamp;
1417 * reordered pos from the last AVPacket that has been input into the decoder
1418 * Code outside libavcodec should access this field using:
1419 * av_frame_get_pkt_pos(frame)
1420 * - encoding: unused
1421 * - decoding: Read by user.
1426 * duration of the corresponding packet, expressed in
1427 * AVStream->time_base units, 0 if unknown.
1428 * Code outside libavcodec should access this field using:
1429 * av_frame_get_pkt_duration(frame)
1430 * - encoding: unused
1431 * - decoding: Read by user.
1433 int64_t pkt_duration;
1437 * Code outside libavcodec should access this field using:
1438 * av_frame_get_metadata(frame)
1439 * - encoding: Set by user.
1440 * - decoding: Set by libavcodec.
1442 AVDictionary *metadata;
1445 * decode error flags of the frame, set to a combination of
1446 * FF_DECODE_ERROR_xxx flags if the decoder produced a frame, but there
1447 * were errors during the decoding.
1448 * Code outside libavcodec should access this field using:
1449 * av_frame_get_decode_error_flags(frame)
1450 * - encoding: unused
1451 * - decoding: set by libavcodec, read by user.
1453 int decode_error_flags;
1454 #define FF_DECODE_ERROR_INVALID_BITSTREAM 1
1455 #define FF_DECODE_ERROR_MISSING_REFERENCE 2
1458 * number of audio channels, only used for audio.
1459 * Code outside libavcodec should access this field using:
1460 * av_frame_get_channels(frame)
1461 * - encoding: unused
1462 * - decoding: Read by user.
1468 * Accessors for some AVFrame fields.
1469 * The position of these field in the structure is not part of the ABI,
1470 * they should not be accessed directly outside libavcodec.
1472 int64_t av_frame_get_best_effort_timestamp(const AVFrame *frame);
1473 void av_frame_set_best_effort_timestamp(AVFrame *frame, int64_t val);
1474 int64_t av_frame_get_pkt_duration (const AVFrame *frame);
1475 void av_frame_set_pkt_duration (AVFrame *frame, int64_t val);
1476 int64_t av_frame_get_pkt_pos (const AVFrame *frame);
1477 void av_frame_set_pkt_pos (AVFrame *frame, int64_t val);
1478 int64_t av_frame_get_channel_layout (const AVFrame *frame);
1479 void av_frame_set_channel_layout (AVFrame *frame, int64_t val);
1480 int av_frame_get_channels (const AVFrame *frame);
1481 void av_frame_set_channels (AVFrame *frame, int val);
1482 int av_frame_get_sample_rate (const AVFrame *frame);
1483 void av_frame_set_sample_rate (AVFrame *frame, int val);
1484 AVDictionary *av_frame_get_metadata (const AVFrame *frame);
1485 void av_frame_set_metadata (AVFrame *frame, AVDictionary *val);
1486 int av_frame_get_decode_error_flags (const AVFrame *frame);
1487 void av_frame_set_decode_error_flags (AVFrame *frame, int val);
1489 struct AVCodecInternal;
1493 AV_FIELD_PROGRESSIVE,
1494 AV_FIELD_TT, //< Top coded_first, top displayed first
1495 AV_FIELD_BB, //< Bottom coded first, bottom displayed first
1496 AV_FIELD_TB, //< Top coded first, bottom displayed first
1497 AV_FIELD_BT, //< Bottom coded first, top displayed first
1501 * main external API structure.
1502 * New fields can be added to the end with minor version bumps.
1503 * Removal, reordering and changes to existing fields require a major
1505 * Please use AVOptions (av_opt* / av_set/get*()) to access these fields from user
1507 * sizeof(AVCodecContext) must not be used outside libav*.
1509 typedef struct AVCodecContext {
1511 * information on struct for av_log
1512 * - set by avcodec_alloc_context3
1514 const AVClass *av_class;
1515 int log_level_offset;
1517 enum AVMediaType codec_type; /* see AVMEDIA_TYPE_xxx */
1518 const struct AVCodec *codec;
1519 char codec_name[32];
1520 enum AVCodecID codec_id; /* see AV_CODEC_ID_xxx */
1523 * fourcc (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A').
1524 * This is used to work around some encoder bugs.
1525 * A demuxer should set this to what is stored in the field used to identify the codec.
1526 * If there are multiple such fields in a container then the demuxer should choose the one
1527 * which maximizes the information about the used codec.
1528 * If the codec tag field in a container is larger than 32 bits then the demuxer should
1529 * remap the longer ID to 32 bits with a table or other structure. Alternatively a new
1530 * extra_codec_tag + size could be added but for this a clear advantage must be demonstrated
1532 * - encoding: Set by user, if not then the default based on codec_id will be used.
1533 * - decoding: Set by user, will be converted to uppercase by libavcodec during init.
1535 unsigned int codec_tag;
1538 * fourcc from the AVI stream header (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A').
1539 * This is used to work around some encoder bugs.
1540 * - encoding: unused
1541 * - decoding: Set by user, will be converted to uppercase by libavcodec during init.
1543 unsigned int stream_codec_tag;
1547 * @deprecated this field is unused
1549 attribute_deprecated int sub_id;
1555 * Private context used for internal data.
1557 * Unlike priv_data, this is not codec-specific. It is used in general
1558 * libavcodec functions.
1560 struct AVCodecInternal *internal;
1563 * Private data of the user, can be used to carry app specific stuff.
1564 * - encoding: Set by user.
1565 * - decoding: Set by user.
1570 * the average bitrate
1571 * - encoding: Set by user; unused for constant quantizer encoding.
1572 * - decoding: Set by libavcodec. 0 or some bitrate if this info is available in the stream.
1577 * number of bits the bitstream is allowed to diverge from the reference.
1578 * the reference can be CBR (for CBR pass1) or VBR (for pass2)
1579 * - encoding: Set by user; unused for constant quantizer encoding.
1580 * - decoding: unused
1582 int bit_rate_tolerance;
1585 * Global quality for codecs which cannot change it per frame.
1586 * This should be proportional to MPEG-1/2/4 qscale.
1587 * - encoding: Set by user.
1588 * - decoding: unused
1593 * - encoding: Set by user.
1594 * - decoding: unused
1596 int compression_level;
1597 #define FF_COMPRESSION_DEFAULT -1
1601 * - encoding: Set by user.
1602 * - decoding: Set by user.
1608 * - encoding: Set by user.
1609 * - decoding: Set by user.
1614 * some codecs need / can use extradata like Huffman tables.
1615 * mjpeg: Huffman tables
1616 * rv10: additional flags
1617 * mpeg4: global headers (they can be in the bitstream or here)
1618 * The allocated memory should be FF_INPUT_BUFFER_PADDING_SIZE bytes larger
1619 * than extradata_size to avoid prolems if it is read with the bitstream reader.
1620 * The bytewise contents of extradata must not depend on the architecture or CPU endianness.
1621 * - encoding: Set/allocated/freed by libavcodec.
1622 * - decoding: Set/allocated/freed by user.
1628 * This is the fundamental unit of time (in seconds) in terms
1629 * of which frame timestamps are represented. For fixed-fps content,
1630 * timebase should be 1/framerate and timestamp increments should be
1632 * - encoding: MUST be set by user.
1633 * - decoding: Set by libavcodec.
1635 AVRational time_base;
1638 * For some codecs, the time base is closer to the field rate than the frame rate.
1639 * Most notably, H.264 and MPEG-2 specify time_base as half of frame duration
1640 * if no telecine is used ...
1642 * Set to time_base ticks per frame. Default 1, e.g., H.264/MPEG-2 set it to 2.
1644 int ticks_per_frame;
1649 * Encoding: Number of frames delay there will be from the encoder input to
1650 * the decoder output. (we assume the decoder matches the spec)
1651 * Decoding: Number of frames delay in addition to what a standard decoder
1652 * as specified in the spec would produce.
1655 * Number of frames the decoded output will be delayed relative to the
1659 * For encoding, this is the number of "priming" samples added to the
1660 * beginning of the stream. The decoded output will be delayed by this
1661 * many samples relative to the input to the encoder. Note that this
1662 * field is purely informational and does not directly affect the pts
1663 * output by the encoder, which should always be based on the actual
1664 * presentation time, including any delay.
1665 * For decoding, this is the number of samples the decoder needs to
1666 * output before the decoder's output is valid. When seeking, you should
1667 * start decoding this many samples prior to your desired seek point.
1669 * - encoding: Set by libavcodec.
1670 * - decoding: Set by libavcodec.
1677 * picture width / height.
1678 * - encoding: MUST be set by user.
1679 * - decoding: Set by libavcodec.
1680 * Note: For compatibility it is possible to set this instead of
1681 * coded_width/height before decoding.
1686 * Bitstream width / height, may be different from width/height if lowres enabled.
1687 * - encoding: unused
1688 * - decoding: Set by user before init if known. Codec should override / dynamically change if needed.
1690 int coded_width, coded_height;
1692 #define FF_ASPECT_EXTENDED 15
1695 * the number of pictures in a group of pictures, or 0 for intra_only
1696 * - encoding: Set by user.
1697 * - decoding: unused
1702 * Pixel format, see AV_PIX_FMT_xxx.
1703 * May be set by the demuxer if known from headers.
1704 * May be overridden by the decoder if it knows better.
1705 * - encoding: Set by user.
1706 * - decoding: Set by user if known, overridden by libavcodec if known
1708 enum AVPixelFormat pix_fmt;
1711 * Motion estimation algorithm used for video coding.
1712 * 1 (zero), 2 (full), 3 (log), 4 (phods), 5 (epzs), 6 (x1), 7 (hex),
1713 * 8 (umh), 9 (iter), 10 (tesa) [7, 8, 10 are x264 specific, 9 is snow specific]
1714 * - encoding: MUST be set by user.
1715 * - decoding: unused
1720 * If non NULL, 'draw_horiz_band' is called by the libavcodec
1721 * decoder to draw a horizontal band. It improves cache usage. Not
1722 * all codecs can do that. You must check the codec capabilities
1724 * When multithreading is used, it may be called from multiple threads
1725 * at the same time; threads might draw different parts of the same AVFrame,
1726 * or multiple AVFrames, and there is no guarantee that slices will be drawn
1728 * The function is also used by hardware acceleration APIs.
1729 * It is called at least once during frame decoding to pass
1730 * the data needed for hardware render.
1731 * In that mode instead of pixel data, AVFrame points to
1732 * a structure specific to the acceleration API. The application
1733 * reads the structure and can change some fields to indicate progress
1735 * - encoding: unused
1736 * - decoding: Set by user.
1737 * @param height the height of the slice
1738 * @param y the y position of the slice
1739 * @param type 1->top field, 2->bottom field, 3->frame
1740 * @param offset offset into the AVFrame.data from which the slice should be read
1742 void (*draw_horiz_band)(struct AVCodecContext *s,
1743 const AVFrame *src, int offset[AV_NUM_DATA_POINTERS],
1744 int y, int type, int height);
1747 * callback to negotiate the pixelFormat
1748 * @param fmt is the list of formats which are supported by the codec,
1749 * it is terminated by -1 as 0 is a valid format, the formats are ordered by quality.
1750 * The first is always the native one.
1751 * @return the chosen format
1752 * - encoding: unused
1753 * - decoding: Set by user, if not set the native format will be chosen.
1755 enum AVPixelFormat (*get_format)(struct AVCodecContext *s, const enum AVPixelFormat * fmt);
1758 * maximum number of B-frames between non-B-frames
1759 * Note: The output will be delayed by max_b_frames+1 relative to the input.
1760 * - encoding: Set by user.
1761 * - decoding: unused
1766 * qscale factor between IP and B-frames
1767 * If > 0 then the last P-frame quantizer will be used (q= lastp_q*factor+offset).
1768 * If < 0 then normal ratecontrol will be done (q= -normal_q*factor+offset).
1769 * - encoding: Set by user.
1770 * - decoding: unused
1772 float b_quant_factor;
1774 /** obsolete FIXME remove */
1776 #define FF_RC_STRATEGY_XVID 1
1778 int b_frame_strategy;
1780 #if FF_API_MPV_GLOBAL_OPTS
1782 * luma single coefficient elimination threshold
1783 * - encoding: Set by user.
1784 * - decoding: unused
1786 attribute_deprecated int luma_elim_threshold;
1789 * chroma single coeff elimination threshold
1790 * - encoding: Set by user.
1791 * - decoding: unused
1793 attribute_deprecated int chroma_elim_threshold;
1797 * qscale offset between IP and B-frames
1798 * - encoding: Set by user.
1799 * - decoding: unused
1801 float b_quant_offset;
1804 * Size of the frame reordering buffer in the decoder.
1805 * For MPEG-2 it is 1 IPB or 0 low delay IP.
1806 * - encoding: Set by libavcodec.
1807 * - decoding: Set by libavcodec.
1812 * 0-> h263 quant 1-> mpeg quant
1813 * - encoding: Set by user.
1814 * - decoding: unused
1819 * qscale factor between P and I-frames
1820 * If > 0 then the last p frame quantizer will be used (q= lastp_q*factor+offset).
1821 * If < 0 then normal ratecontrol will be done (q= -normal_q*factor+offset).
1822 * - encoding: Set by user.
1823 * - decoding: unused
1825 float i_quant_factor;
1828 * qscale offset between P and I-frames
1829 * - encoding: Set by user.
1830 * - decoding: unused
1832 float i_quant_offset;
1835 * luminance masking (0-> disabled)
1836 * - encoding: Set by user.
1837 * - decoding: unused
1842 * temporary complexity masking (0-> disabled)
1843 * - encoding: Set by user.
1844 * - decoding: unused
1846 float temporal_cplx_masking;
1849 * spatial complexity masking (0-> disabled)
1850 * - encoding: Set by user.
1851 * - decoding: unused
1853 float spatial_cplx_masking;
1856 * p block masking (0-> disabled)
1857 * - encoding: Set by user.
1858 * - decoding: unused
1863 * darkness masking (0-> disabled)
1864 * - encoding: Set by user.
1865 * - decoding: unused
1871 * - encoding: Set by libavcodec.
1872 * - decoding: Set by user (or 0).
1876 * prediction method (needed for huffyuv)
1877 * - encoding: Set by user.
1878 * - decoding: unused
1880 int prediction_method;
1881 #define FF_PRED_LEFT 0
1882 #define FF_PRED_PLANE 1
1883 #define FF_PRED_MEDIAN 2
1886 * slice offsets in the frame in bytes
1887 * - encoding: Set/allocated by libavcodec.
1888 * - decoding: Set/allocated by user (or NULL).
1893 * sample aspect ratio (0 if unknown)
1894 * That is the width of a pixel divided by the height of the pixel.
1895 * Numerator and denominator must be relatively prime and smaller than 256 for some video standards.
1896 * - encoding: Set by user.
1897 * - decoding: Set by libavcodec.
1899 AVRational sample_aspect_ratio;
1902 * motion estimation comparison function
1903 * - encoding: Set by user.
1904 * - decoding: unused
1908 * subpixel motion estimation comparison function
1909 * - encoding: Set by user.
1910 * - decoding: unused
1914 * macroblock comparison function (not supported yet)
1915 * - encoding: Set by user.
1916 * - decoding: unused
1920 * interlaced DCT comparison function
1921 * - encoding: Set by user.
1922 * - decoding: unused
1925 #define FF_CMP_SAD 0
1926 #define FF_CMP_SSE 1
1927 #define FF_CMP_SATD 2
1928 #define FF_CMP_DCT 3
1929 #define FF_CMP_PSNR 4
1930 #define FF_CMP_BIT 5
1932 #define FF_CMP_ZERO 7
1933 #define FF_CMP_VSAD 8
1934 #define FF_CMP_VSSE 9
1935 #define FF_CMP_NSSE 10
1936 #define FF_CMP_W53 11
1937 #define FF_CMP_W97 12
1938 #define FF_CMP_DCTMAX 13
1939 #define FF_CMP_DCT264 14
1940 #define FF_CMP_CHROMA 256
1943 * ME diamond size & shape
1944 * - encoding: Set by user.
1945 * - decoding: unused
1950 * amount of previous MV predictors (2a+1 x 2a+1 square)
1951 * - encoding: Set by user.
1952 * - decoding: unused
1954 int last_predictor_count;
1957 * prepass for motion estimation
1958 * - encoding: Set by user.
1959 * - decoding: unused
1964 * motion estimation prepass comparison function
1965 * - encoding: Set by user.
1966 * - decoding: unused
1971 * ME prepass diamond size & shape
1972 * - encoding: Set by user.
1973 * - decoding: unused
1979 * - encoding: Set by user.
1980 * - decoding: unused
1982 int me_subpel_quality;
1985 * DTG active format information (additional aspect ratio
1986 * information only used in DVB MPEG-2 transport streams)
1989 * - encoding: unused
1990 * - decoding: Set by decoder.
1992 int dtg_active_format;
1993 #define FF_DTG_AFD_SAME 8
1994 #define FF_DTG_AFD_4_3 9
1995 #define FF_DTG_AFD_16_9 10
1996 #define FF_DTG_AFD_14_9 11
1997 #define FF_DTG_AFD_4_3_SP_14_9 13
1998 #define FF_DTG_AFD_16_9_SP_14_9 14
1999 #define FF_DTG_AFD_SP_4_3 15
2002 * maximum motion estimation search range in subpel units
2003 * If 0 then no limit.
2005 * - encoding: Set by user.
2006 * - decoding: unused
2011 * intra quantizer bias
2012 * - encoding: Set by user.
2013 * - decoding: unused
2015 int intra_quant_bias;
2016 #define FF_DEFAULT_QUANT_BIAS 999999
2019 * inter quantizer bias
2020 * - encoding: Set by user.
2021 * - decoding: unused
2023 int inter_quant_bias;
2025 #if FF_API_COLOR_TABLE_ID
2028 * - encoding: unused
2029 * - decoding: Which clrtable should be used for 8bit RGB images.
2030 * Tables have to be stored somewhere. FIXME
2032 attribute_deprecated int color_table_id;
2037 * - encoding: unused
2038 * - decoding: Set by user.
2041 #define SLICE_FLAG_CODED_ORDER 0x0001 ///< draw_horiz_band() is called in coded order instead of display
2042 #define SLICE_FLAG_ALLOW_FIELD 0x0002 ///< allow draw_horiz_band() with field slices (MPEG2 field pics)
2043 #define SLICE_FLAG_ALLOW_PLANE 0x0004 ///< allow draw_horiz_band() with 1 component at a time (SVQ1)
2046 * XVideo Motion Acceleration
2047 * - encoding: forbidden
2048 * - decoding: set by decoder
2050 int xvmc_acceleration;
2053 * macroblock decision mode
2054 * - encoding: Set by user.
2055 * - decoding: unused
2058 #define FF_MB_DECISION_SIMPLE 0 ///< uses mb_cmp
2059 #define FF_MB_DECISION_BITS 1 ///< chooses the one which needs the fewest bits
2060 #define FF_MB_DECISION_RD 2 ///< rate distortion
2063 * custom intra quantization matrix
2064 * - encoding: Set by user, can be NULL.
2065 * - decoding: Set by libavcodec.
2067 uint16_t *intra_matrix;
2070 * custom inter quantization matrix
2071 * - encoding: Set by user, can be NULL.
2072 * - decoding: Set by libavcodec.
2074 uint16_t *inter_matrix;
2077 * scene change detection threshold
2078 * 0 is default, larger means fewer detected scene changes.
2079 * - encoding: Set by user.
2080 * - decoding: unused
2082 int scenechange_threshold;
2085 * noise reduction strength
2086 * - encoding: Set by user.
2087 * - decoding: unused
2089 int noise_reduction;
2091 #if FF_API_INTER_THRESHOLD
2093 * @deprecated this field is unused
2095 attribute_deprecated int inter_threshold;
2098 #if FF_API_MPV_GLOBAL_OPTS
2100 * @deprecated use mpegvideo private options instead
2102 attribute_deprecated int quantizer_noise_shaping;
2106 * Motion estimation threshold below which no motion estimation is
2107 * performed, but instead the user specified motion vectors are used.
2109 * - encoding: Set by user.
2110 * - decoding: unused
2115 * Macroblock threshold below which the user specified macroblock types will be used.
2116 * - encoding: Set by user.
2117 * - decoding: unused
2122 * precision of the intra DC coefficient - 8
2123 * - encoding: Set by user.
2124 * - decoding: unused
2126 int intra_dc_precision;
2129 * Number of macroblock rows at the top which are skipped.
2130 * - encoding: unused
2131 * - decoding: Set by user.
2136 * Number of macroblock rows at the bottom which are skipped.
2137 * - encoding: unused
2138 * - decoding: Set by user.
2143 * Border processing masking, raises the quantizer for mbs on the borders
2145 * - encoding: Set by user.
2146 * - decoding: unused
2148 float border_masking;
2151 * minimum MB lagrange multipler
2152 * - encoding: Set by user.
2153 * - decoding: unused
2158 * maximum MB lagrange multipler
2159 * - encoding: Set by user.
2160 * - decoding: unused
2166 * - encoding: Set by user.
2167 * - decoding: unused
2169 int me_penalty_compensation;
2173 * - encoding: Set by user.
2174 * - decoding: unused
2180 * - encoding: Set by user.
2181 * - decoding: unused
2187 * - encoding: Set by user.
2188 * - decoding: unused
2193 * number of reference frames
2194 * - encoding: Set by user.
2195 * - decoding: Set by lavc.
2200 * chroma qp offset from luma
2201 * - encoding: Set by user.
2202 * - decoding: unused
2207 * Multiplied by qscale for each frame and added to scene_change_score.
2208 * - encoding: Set by user.
2209 * - decoding: unused
2211 int scenechange_factor;
2215 * Note: Value depends upon the compare function used for fullpel ME.
2216 * - encoding: Set by user.
2217 * - decoding: unused
2222 * Adjust sensitivity of b_frame_strategy 1.
2223 * - encoding: Set by user.
2224 * - decoding: unused
2229 * Chromaticity coordinates of the source primaries.
2230 * - encoding: Set by user
2231 * - decoding: Set by libavcodec
2233 enum AVColorPrimaries color_primaries;
2236 * Color Transfer Characteristic.
2237 * - encoding: Set by user
2238 * - decoding: Set by libavcodec
2240 enum AVColorTransferCharacteristic color_trc;
2243 * YUV colorspace type.
2244 * - encoding: Set by user
2245 * - decoding: Set by libavcodec
2247 enum AVColorSpace colorspace;
2250 * MPEG vs JPEG YUV range.
2251 * - encoding: Set by user
2252 * - decoding: Set by libavcodec
2254 enum AVColorRange color_range;
2257 * This defines the location of chroma samples.
2258 * - encoding: Set by user
2259 * - decoding: Set by libavcodec
2261 enum AVChromaLocation chroma_sample_location;
2265 * Indicates number of picture subdivisions. Used for parallelized
2267 * - encoding: Set by user
2268 * - decoding: unused
2273 * - encoding: set by libavcodec
2274 * - decoding: Set by user.
2276 enum AVFieldOrder field_order;
2279 int sample_rate; ///< samples per second
2280 int channels; ///< number of audio channels
2283 * audio sample format
2284 * - encoding: Set by user.
2285 * - decoding: Set by libavcodec.
2287 enum AVSampleFormat sample_fmt; ///< sample format
2289 /* The following data should not be initialized. */
2291 * Number of samples per channel in an audio frame.
2293 * - encoding: set by libavcodec in avcodec_open2(). Each submitted frame
2294 * except the last must contain exactly frame_size samples per channel.
2295 * May be 0 when the codec has CODEC_CAP_VARIABLE_FRAME_SIZE set, then the
2296 * frame size is not restricted.
2297 * - decoding: may be set by some decoders to indicate constant frame size
2302 * Frame counter, set by libavcodec.
2304 * - decoding: total number of frames returned from the decoder so far.
2305 * - encoding: total number of frames passed to the encoder so far.
2307 * @note the counter is not incremented if encoding/decoding resulted in
2313 * number of bytes per packet if constant and known or 0
2314 * Used by some WAV based audio codecs.
2319 * Audio cutoff bandwidth (0 means "automatic")
2320 * - encoding: Set by user.
2321 * - decoding: unused
2325 #if FF_API_REQUEST_CHANNELS
2327 * Decoder should decode to this many channels if it can (0 for default)
2328 * - encoding: unused
2329 * - decoding: Set by user.
2330 * @deprecated Deprecated in favor of request_channel_layout.
2332 int request_channels;
2336 * Audio channel layout.
2337 * - encoding: set by user.
2338 * - decoding: set by user, may be overwritten by libavcodec.
2340 uint64_t channel_layout;
2343 * Request decoder to use this channel layout if it can (0 for default)
2344 * - encoding: unused
2345 * - decoding: Set by user.
2347 uint64_t request_channel_layout;
2350 * Type of service that the audio stream conveys.
2351 * - encoding: Set by user.
2352 * - decoding: Set by libavcodec.
2354 enum AVAudioServiceType audio_service_type;
2357 * desired sample format
2358 * - encoding: Not used.
2359 * - decoding: Set by user.
2360 * Decoder will decode to this format if it can.
2362 enum AVSampleFormat request_sample_fmt;
2365 * Called at the beginning of each frame to get a buffer for it.
2367 * The function will set AVFrame.data[], AVFrame.linesize[].
2368 * AVFrame.extended_data[] must also be set, but it should be the same as
2369 * AVFrame.data[] except for planar audio with more channels than can fit
2370 * in AVFrame.data[]. In that case, AVFrame.data[] shall still contain as
2371 * many data pointers as it can hold.
2373 * if CODEC_CAP_DR1 is not set then get_buffer() must call
2374 * avcodec_default_get_buffer() instead of providing buffers allocated by
2377 * AVFrame.data[] should be 32- or 16-byte-aligned unless the CPU doesn't
2378 * need it. avcodec_default_get_buffer() aligns the output buffer properly,
2379 * but if get_buffer() is overridden then alignment considerations should
2380 * be taken into account.
2382 * @see avcodec_default_get_buffer()
2386 * If pic.reference is set then the frame will be read later by libavcodec.
2387 * avcodec_align_dimensions2() should be used to find the required width and
2388 * height, as they normally need to be rounded up to the next multiple of 16.
2390 * If frame multithreading is used and thread_safe_callbacks is set,
2391 * it may be called from a different thread, but not from more than one at
2392 * once. Does not need to be reentrant.
2394 * @see release_buffer(), reget_buffer()
2395 * @see avcodec_align_dimensions2()
2399 * Decoders request a buffer of a particular size by setting
2400 * AVFrame.nb_samples prior to calling get_buffer(). The decoder may,
2401 * however, utilize only part of the buffer by setting AVFrame.nb_samples
2402 * to a smaller value in the output frame.
2404 * Decoders cannot use the buffer after returning from
2405 * avcodec_decode_audio4(), so they will not call release_buffer(), as it
2406 * is assumed to be released immediately upon return.
2408 * As a convenience, av_samples_get_buffer_size() and
2409 * av_samples_fill_arrays() in libavutil may be used by custom get_buffer()
2410 * functions to find the required data size and to fill data pointers and
2411 * linesize. In AVFrame.linesize, only linesize[0] may be set for audio
2412 * since all planes must be the same size.
2414 * @see av_samples_get_buffer_size(), av_samples_fill_arrays()
2416 * - encoding: unused
2417 * - decoding: Set by libavcodec, user can override.
2419 int (*get_buffer)(struct AVCodecContext *c, AVFrame *pic);
2422 * Called to release buffers which were allocated with get_buffer.
2423 * A released buffer can be reused in get_buffer().
2424 * pic.data[*] must be set to NULL.
2425 * May be called from a different thread if frame multithreading is used,
2426 * but not by more than one thread at once, so does not need to be reentrant.
2427 * - encoding: unused
2428 * - decoding: Set by libavcodec, user can override.
2430 void (*release_buffer)(struct AVCodecContext *c, AVFrame *pic);
2433 * Called at the beginning of a frame to get cr buffer for it.
2434 * Buffer type (size, hints) must be the same. libavcodec won't check it.
2435 * libavcodec will pass previous buffer in pic, function should return
2436 * same buffer or new buffer with old frame "painted" into it.
2437 * If pic.data[0] == NULL must behave like get_buffer().
2438 * if CODEC_CAP_DR1 is not set then reget_buffer() must call
2439 * avcodec_default_reget_buffer() instead of providing buffers allocated by
2441 * - encoding: unused
2442 * - decoding: Set by libavcodec, user can override.
2444 int (*reget_buffer)(struct AVCodecContext *c, AVFrame *pic);
2447 /* - encoding parameters */
2448 float qcompress; ///< amount of qscale change between easy & hard scenes (0.0-1.0)
2449 float qblur; ///< amount of qscale smoothing over time (0.0-1.0)
2453 * - encoding: Set by user.
2454 * - decoding: unused
2460 * - encoding: Set by user.
2461 * - decoding: unused
2466 * maximum quantizer difference between frames
2467 * - encoding: Set by user.
2468 * - decoding: unused
2473 * ratecontrol qmin qmax limiting method
2474 * 0-> clipping, 1-> use a nice continuous function to limit qscale wthin qmin/qmax.
2475 * - encoding: Set by user.
2476 * - decoding: unused
2484 * decoder bitstream buffer size
2485 * - encoding: Set by user.
2486 * - decoding: unused
2491 * ratecontrol override, see RcOverride
2492 * - encoding: Allocated/set/freed by user.
2493 * - decoding: unused
2495 int rc_override_count;
2496 RcOverride *rc_override;
2499 * rate control equation
2500 * - encoding: Set by user
2501 * - decoding: unused
2507 * - encoding: Set by user.
2508 * - decoding: unused
2514 * - encoding: Set by user.
2515 * - decoding: unused
2519 float rc_buffer_aggressivity;
2522 * initial complexity for pass1 ratecontrol
2523 * - encoding: Set by user.
2524 * - decoding: unused
2526 float rc_initial_cplx;
2529 * Ratecontrol attempt to use, at maximum, <value> of what can be used without an underflow.
2530 * - encoding: Set by user.
2531 * - decoding: unused.
2533 float rc_max_available_vbv_use;
2536 * Ratecontrol attempt to use, at least, <value> times the amount needed to prevent a vbv overflow.
2537 * - encoding: Set by user.
2538 * - decoding: unused.
2540 float rc_min_vbv_overflow_use;
2543 * Number of bits which should be loaded into the rc buffer before decoding starts.
2544 * - encoding: Set by user.
2545 * - decoding: unused
2547 int rc_initial_buffer_occupancy;
2549 #define FF_CODER_TYPE_VLC 0
2550 #define FF_CODER_TYPE_AC 1
2551 #define FF_CODER_TYPE_RAW 2
2552 #define FF_CODER_TYPE_RLE 3
2553 #define FF_CODER_TYPE_DEFLATE 4
2556 * - encoding: Set by user.
2557 * - decoding: unused
2563 * - encoding: Set by user.
2564 * - decoding: unused
2569 * minimum Lagrange multipler
2570 * - encoding: Set by user.
2571 * - decoding: unused
2576 * maximum Lagrange multipler
2577 * - encoding: Set by user.
2578 * - decoding: unused
2583 * frame skip threshold
2584 * - encoding: Set by user.
2585 * - decoding: unused
2587 int frame_skip_threshold;
2591 * - encoding: Set by user.
2592 * - decoding: unused
2594 int frame_skip_factor;
2597 * frame skip exponent
2598 * - encoding: Set by user.
2599 * - decoding: unused
2604 * frame skip comparison function
2605 * - encoding: Set by user.
2606 * - decoding: unused
2611 * trellis RD quantization
2612 * - encoding: Set by user.
2613 * - decoding: unused
2618 * - encoding: Set by user.
2619 * - decoding: unused
2621 int min_prediction_order;
2624 * - encoding: Set by user.
2625 * - decoding: unused
2627 int max_prediction_order;
2630 * GOP timecode frame start number
2631 * - encoding: Set by user, in non drop frame format
2632 * - decoding: Set by libavcodec (timecode in the 25 bits format, -1 if unset)
2634 int64_t timecode_frame_start;
2636 /* The RTP callback: This function is called */
2637 /* every time the encoder has a packet to send. */
2638 /* It depends on the encoder if the data starts */
2639 /* with a Start Code (it should). H.263 does. */
2640 /* mb_nb contains the number of macroblocks */
2641 /* encoded in the RTP payload. */
2642 void (*rtp_callback)(struct AVCodecContext *avctx, void *data, int size, int mb_nb);
2644 int rtp_payload_size; /* The size of the RTP payload: the coder will */
2645 /* do its best to deliver a chunk with size */
2646 /* below rtp_payload_size, the chunk will start */
2647 /* with a start code on some codecs like H.263. */
2648 /* This doesn't take account of any particular */
2649 /* headers inside the transmitted RTP payload. */
2651 /* statistics, used for 2-pass encoding */
2662 * number of bits used for the previously encoded frame
2663 * - encoding: Set by libavcodec.
2664 * - decoding: unused
2669 * pass1 encoding statistics output buffer
2670 * - encoding: Set by libavcodec.
2671 * - decoding: unused
2676 * pass2 encoding statistics input buffer
2677 * Concatenated stuff from stats_out of pass1 should be placed here.
2678 * - encoding: Allocated/set/freed by user.
2679 * - decoding: unused
2684 * Work around bugs in encoders which sometimes cannot be detected automatically.
2685 * - encoding: Set by user
2686 * - decoding: Set by user
2688 int workaround_bugs;
2689 #define FF_BUG_AUTODETECT 1 ///< autodetection
2690 #define FF_BUG_OLD_MSMPEG4 2
2691 #define FF_BUG_XVID_ILACE 4
2692 #define FF_BUG_UMP4 8
2693 #define FF_BUG_NO_PADDING 16
2694 #define FF_BUG_AMV 32
2695 #define FF_BUG_AC_VLC 0 ///< Will be removed, libavcodec can now handle these non-compliant files by default.
2696 #define FF_BUG_QPEL_CHROMA 64
2697 #define FF_BUG_STD_QPEL 128
2698 #define FF_BUG_QPEL_CHROMA2 256
2699 #define FF_BUG_DIRECT_BLOCKSIZE 512
2700 #define FF_BUG_EDGE 1024
2701 #define FF_BUG_HPEL_CHROMA 2048
2702 #define FF_BUG_DC_CLIP 4096
2703 #define FF_BUG_MS 8192 ///< Work around various bugs in Microsoft's broken decoders.
2704 #define FF_BUG_TRUNCATED 16384
2707 * strictly follow the standard (MPEG4, ...).
2708 * - encoding: Set by user.
2709 * - decoding: Set by user.
2710 * Setting this to STRICT or higher means the encoder and decoder will
2711 * generally do stupid things, whereas setting it to unofficial or lower
2712 * will mean the encoder might produce output that is not supported by all
2713 * spec-compliant decoders. Decoders don't differentiate between normal,
2714 * unofficial and experimental (that is, they always try to decode things
2715 * when they can) unless they are explicitly asked to behave stupidly
2716 * (=strictly conform to the specs)
2718 int strict_std_compliance;
2719 #define FF_COMPLIANCE_VERY_STRICT 2 ///< Strictly conform to an older more strict version of the spec or reference software.
2720 #define FF_COMPLIANCE_STRICT 1 ///< Strictly conform to all the things in the spec no matter what consequences.
2721 #define FF_COMPLIANCE_NORMAL 0
2722 #define FF_COMPLIANCE_UNOFFICIAL -1 ///< Allow unofficial extensions
2723 #define FF_COMPLIANCE_EXPERIMENTAL -2 ///< Allow nonstandardized experimental things.
2726 * error concealment flags
2727 * - encoding: unused
2728 * - decoding: Set by user.
2730 int error_concealment;
2731 #define FF_EC_GUESS_MVS 1
2732 #define FF_EC_DEBLOCK 2
2736 * - encoding: Set by user.
2737 * - decoding: Set by user.
2740 #define FF_DEBUG_PICT_INFO 1
2741 #define FF_DEBUG_RC 2
2742 #define FF_DEBUG_BITSTREAM 4
2743 #define FF_DEBUG_MB_TYPE 8
2744 #define FF_DEBUG_QP 16
2745 #define FF_DEBUG_MV 32
2746 #define FF_DEBUG_DCT_COEFF 0x00000040
2747 #define FF_DEBUG_SKIP 0x00000080
2748 #define FF_DEBUG_STARTCODE 0x00000100
2749 #define FF_DEBUG_PTS 0x00000200
2750 #define FF_DEBUG_ER 0x00000400
2751 #define FF_DEBUG_MMCO 0x00000800
2752 #define FF_DEBUG_BUGS 0x00001000
2753 #define FF_DEBUG_VIS_QP 0x00002000
2754 #define FF_DEBUG_VIS_MB_TYPE 0x00004000
2755 #define FF_DEBUG_BUFFERS 0x00008000
2756 #define FF_DEBUG_THREADS 0x00010000
2760 * - encoding: Set by user.
2761 * - decoding: Set by user.
2764 #define FF_DEBUG_VIS_MV_P_FOR 0x00000001 //visualize forward predicted MVs of P frames
2765 #define FF_DEBUG_VIS_MV_B_FOR 0x00000002 //visualize forward predicted MVs of B frames
2766 #define FF_DEBUG_VIS_MV_B_BACK 0x00000004 //visualize backward predicted MVs of B frames
2769 * Error recognition; may misdetect some more or less valid parts as errors.
2770 * - encoding: unused
2771 * - decoding: Set by user.
2773 int err_recognition;
2774 #define AV_EF_CRCCHECK (1<<0)
2775 #define AV_EF_BITSTREAM (1<<1)
2776 #define AV_EF_BUFFER (1<<2)
2777 #define AV_EF_EXPLODE (1<<3)
2779 #define AV_EF_CAREFUL (1<<16)
2780 #define AV_EF_COMPLIANT (1<<17)
2781 #define AV_EF_AGGRESSIVE (1<<18)
2785 * opaque 64bit number (generally a PTS) that will be reordered and
2786 * output in AVFrame.reordered_opaque
2787 * @deprecated in favor of pkt_pts
2788 * - encoding: unused
2789 * - decoding: Set by user.
2791 int64_t reordered_opaque;
2794 * Hardware accelerator in use
2795 * - encoding: unused.
2796 * - decoding: Set by libavcodec
2798 struct AVHWAccel *hwaccel;
2801 * Hardware accelerator context.
2802 * For some hardware accelerators, a global context needs to be
2803 * provided by the user. In that case, this holds display-dependent
2804 * data FFmpeg cannot instantiate itself. Please refer to the
2805 * FFmpeg HW accelerator documentation to know how to fill this
2806 * is. e.g. for VA API, this is a struct vaapi_context.
2807 * - encoding: unused
2808 * - decoding: Set by user
2810 void *hwaccel_context;
2814 * - encoding: Set by libavcodec if flags&CODEC_FLAG_PSNR.
2815 * - decoding: unused
2817 uint64_t error[AV_NUM_DATA_POINTERS];
2820 * DCT algorithm, see FF_DCT_* below
2821 * - encoding: Set by user.
2822 * - decoding: unused
2825 #define FF_DCT_AUTO 0
2826 #define FF_DCT_FASTINT 1
2827 #define FF_DCT_INT 2
2828 #define FF_DCT_MMX 3
2829 #define FF_DCT_ALTIVEC 5
2830 #define FF_DCT_FAAN 6
2833 * IDCT algorithm, see FF_IDCT_* below.
2834 * - encoding: Set by user.
2835 * - decoding: Set by user.
2838 #define FF_IDCT_AUTO 0
2839 #define FF_IDCT_INT 1
2840 #define FF_IDCT_SIMPLE 2
2841 #define FF_IDCT_SIMPLEMMX 3
2842 #define FF_IDCT_LIBMPEG2MMX 4
2844 #define FF_IDCT_MMI 5
2846 #define FF_IDCT_ARM 7
2847 #define FF_IDCT_ALTIVEC 8
2848 #define FF_IDCT_SH4 9
2849 #define FF_IDCT_SIMPLEARM 10
2850 #define FF_IDCT_H264 11
2851 #define FF_IDCT_VP3 12
2852 #define FF_IDCT_IPP 13
2853 #define FF_IDCT_XVIDMMX 14
2854 #define FF_IDCT_CAVS 15
2855 #define FF_IDCT_SIMPLEARMV5TE 16
2856 #define FF_IDCT_SIMPLEARMV6 17
2857 #define FF_IDCT_SIMPLEVIS 18
2858 #define FF_IDCT_WMV2 19
2859 #define FF_IDCT_FAAN 20
2860 #define FF_IDCT_EA 21
2861 #define FF_IDCT_SIMPLENEON 22
2862 #define FF_IDCT_SIMPLEALPHA 23
2863 #define FF_IDCT_BINK 24
2868 * @deprecated use av_set_cpu_flags_mask() instead.
2870 attribute_deprecated unsigned dsp_mask;
2874 * bits per sample/pixel from the demuxer (needed for huffyuv).
2875 * - encoding: Set by libavcodec.
2876 * - decoding: Set by user.
2878 int bits_per_coded_sample;
2881 * Bits per sample/pixel of internal libavcodec pixel/sample format.
2882 * - encoding: set by user.
2883 * - decoding: set by libavcodec.
2885 int bits_per_raw_sample;
2888 * low resolution decoding, 1-> 1/2 size, 2->1/4 size
2889 * - encoding: unused
2890 * - decoding: Set by user.
2895 * the picture in the bitstream
2896 * - encoding: Set by libavcodec.
2897 * - decoding: Set by libavcodec.
2899 AVFrame *coded_frame;
2903 * is used to decide how many independent tasks should be passed to execute()
2904 * - encoding: Set by user.
2905 * - decoding: Set by user.
2910 * Which multithreading methods to use.
2911 * Use of FF_THREAD_FRAME will increase decoding delay by one frame per thread,
2912 * so clients which cannot provide future frames should not use it.
2914 * - encoding: Set by user, otherwise the default is used.
2915 * - decoding: Set by user, otherwise the default is used.
2918 #define FF_THREAD_FRAME 1 ///< Decode more than one frame at once
2919 #define FF_THREAD_SLICE 2 ///< Decode more than one part of a single frame at once
2922 * Which multithreading methods are in use by the codec.
2923 * - encoding: Set by libavcodec.
2924 * - decoding: Set by libavcodec.
2926 int active_thread_type;
2929 * Set by the client if its custom get_buffer() callback can be called
2930 * synchronously from another thread, which allows faster multithreaded decoding.
2931 * draw_horiz_band() will be called from other threads regardless of this setting.
2932 * Ignored if the default get_buffer() is used.
2933 * - encoding: Set by user.
2934 * - decoding: Set by user.
2936 int thread_safe_callbacks;
2939 * The codec may call this to execute several independent things.
2940 * It will return only after finishing all tasks.
2941 * The user may replace this with some multithreaded implementation,
2942 * the default implementation will execute the parts serially.
2943 * @param count the number of things to execute
2944 * - encoding: Set by libavcodec, user can override.
2945 * - decoding: Set by libavcodec, user can override.
2947 int (*execute)(struct AVCodecContext *c, int (*func)(struct AVCodecContext *c2, void *arg), void *arg2, int *ret, int count, int size);
2950 * The codec may call this to execute several independent things.
2951 * It will return only after finishing all tasks.
2952 * The user may replace this with some multithreaded implementation,
2953 * the default implementation will execute the parts serially.
2954 * Also see avcodec_thread_init and e.g. the --enable-pthread configure option.
2955 * @param c context passed also to func
2956 * @param count the number of things to execute
2957 * @param arg2 argument passed unchanged to func
2958 * @param ret return values of executed functions, must have space for "count" values. May be NULL.
2959 * @param func function that will be called count times, with jobnr from 0 to count-1.
2960 * threadnr will be in the range 0 to c->thread_count-1 < MAX_THREADS and so that no
2961 * two instances of func executing at the same time will have the same threadnr.
2962 * @return always 0 currently, but code should handle a future improvement where when any call to func
2963 * returns < 0 no further calls to func may be done and < 0 is returned.
2964 * - encoding: Set by libavcodec, user can override.
2965 * - decoding: Set by libavcodec, user can override.
2967 int (*execute2)(struct AVCodecContext *c, int (*func)(struct AVCodecContext *c2, void *arg, int jobnr, int threadnr), void *arg2, int *ret, int count);
2971 * Can be used by execute() to store some per AVCodecContext stuff.
2972 * - encoding: set by execute()
2973 * - decoding: set by execute()
2975 void *thread_opaque;
2978 * noise vs. sse weight for the nsse comparsion function
2979 * - encoding: Set by user.
2980 * - decoding: unused
2986 * - encoding: Set by user.
2987 * - decoding: Set by libavcodec.
2990 #define FF_PROFILE_UNKNOWN -99
2991 #define FF_PROFILE_RESERVED -100
2993 #define FF_PROFILE_AAC_MAIN 0
2994 #define FF_PROFILE_AAC_LOW 1
2995 #define FF_PROFILE_AAC_SSR 2
2996 #define FF_PROFILE_AAC_LTP 3
2997 #define FF_PROFILE_AAC_HE 4
2998 #define FF_PROFILE_AAC_HE_V2 28
2999 #define FF_PROFILE_AAC_LD 22
3000 #define FF_PROFILE_AAC_ELD 38
3002 #define FF_PROFILE_DTS 20
3003 #define FF_PROFILE_DTS_ES 30
3004 #define FF_PROFILE_DTS_96_24 40
3005 #define FF_PROFILE_DTS_HD_HRA 50
3006 #define FF_PROFILE_DTS_HD_MA 60
3008 #define FF_PROFILE_MPEG2_422 0
3009 #define FF_PROFILE_MPEG2_HIGH 1
3010 #define FF_PROFILE_MPEG2_SS 2
3011 #define FF_PROFILE_MPEG2_SNR_SCALABLE 3
3012 #define FF_PROFILE_MPEG2_MAIN 4
3013 #define FF_PROFILE_MPEG2_SIMPLE 5
3015 #define FF_PROFILE_H264_CONSTRAINED (1<<9) // 8+1; constraint_set1_flag
3016 #define FF_PROFILE_H264_INTRA (1<<11) // 8+3; constraint_set3_flag
3018 #define FF_PROFILE_H264_BASELINE 66
3019 #define FF_PROFILE_H264_CONSTRAINED_BASELINE (66|FF_PROFILE_H264_CONSTRAINED)
3020 #define FF_PROFILE_H264_MAIN 77
3021 #define FF_PROFILE_H264_EXTENDED 88
3022 #define FF_PROFILE_H264_HIGH 100
3023 #define FF_PROFILE_H264_HIGH_10 110
3024 #define FF_PROFILE_H264_HIGH_10_INTRA (110|FF_PROFILE_H264_INTRA)
3025 #define FF_PROFILE_H264_HIGH_422 122
3026 #define FF_PROFILE_H264_HIGH_422_INTRA (122|FF_PROFILE_H264_INTRA)
3027 #define FF_PROFILE_H264_HIGH_444 144
3028 #define FF_PROFILE_H264_HIGH_444_PREDICTIVE 244
3029 #define FF_PROFILE_H264_HIGH_444_INTRA (244|FF_PROFILE_H264_INTRA)
3030 #define FF_PROFILE_H264_CAVLC_444 44
3032 #define FF_PROFILE_VC1_SIMPLE 0
3033 #define FF_PROFILE_VC1_MAIN 1
3034 #define FF_PROFILE_VC1_COMPLEX 2
3035 #define FF_PROFILE_VC1_ADVANCED 3
3037 #define FF_PROFILE_MPEG4_SIMPLE 0
3038 #define FF_PROFILE_MPEG4_SIMPLE_SCALABLE 1
3039 #define FF_PROFILE_MPEG4_CORE 2
3040 #define FF_PROFILE_MPEG4_MAIN 3
3041 #define FF_PROFILE_MPEG4_N_BIT 4
3042 #define FF_PROFILE_MPEG4_SCALABLE_TEXTURE 5
3043 #define FF_PROFILE_MPEG4_SIMPLE_FACE_ANIMATION 6
3044 #define FF_PROFILE_MPEG4_BASIC_ANIMATED_TEXTURE 7
3045 #define FF_PROFILE_MPEG4_HYBRID 8
3046 #define FF_PROFILE_MPEG4_ADVANCED_REAL_TIME 9
3047 #define FF_PROFILE_MPEG4_CORE_SCALABLE 10
3048 #define FF_PROFILE_MPEG4_ADVANCED_CODING 11
3049 #define FF_PROFILE_MPEG4_ADVANCED_CORE 12
3050 #define FF_PROFILE_MPEG4_ADVANCED_SCALABLE_TEXTURE 13
3051 #define FF_PROFILE_MPEG4_SIMPLE_STUDIO 14
3052 #define FF_PROFILE_MPEG4_ADVANCED_SIMPLE 15
3056 * - encoding: Set by user.
3057 * - decoding: Set by libavcodec.
3060 #define FF_LEVEL_UNKNOWN -99
3064 * - encoding: unused
3065 * - decoding: Set by user.
3067 enum AVDiscard skip_loop_filter;
3071 * - encoding: unused
3072 * - decoding: Set by user.
3074 enum AVDiscard skip_idct;
3078 * - encoding: unused
3079 * - decoding: Set by user.
3081 enum AVDiscard skip_frame;
3084 * Header containing style information for text subtitles.
3085 * For SUBTITLE_ASS subtitle type, it should contain the whole ASS
3086 * [Script Info] and [V4+ Styles] section, plus the [Events] line and
3087 * the Format line following. It shouldn't include any Dialogue line.
3088 * - encoding: Set/allocated/freed by user (before avcodec_open2())
3089 * - decoding: Set/allocated/freed by libavcodec (by avcodec_open2())
3091 uint8_t *subtitle_header;
3092 int subtitle_header_size;
3095 * Simulates errors in the bitstream to test error concealment.
3096 * - encoding: Set by user.
3097 * - decoding: unused
3102 * Current packet as passed into the decoder, to avoid having
3103 * to pass the packet into every function. Currently only valid
3104 * inside lavc and get/release_buffer callbacks.
3105 * - decoding: set by avcodec_decode_*, read by get_buffer() for setting pkt_pts
3106 * - encoding: unused
3111 * VBV delay coded in the last frame (in periods of a 27 MHz clock).
3112 * Used for compliant TS muxing.
3113 * - encoding: Set by libavcodec.
3114 * - decoding: unused.
3119 * Timebase in which pkt_dts/pts and AVPacket.dts/pts are.
3120 * Code outside libavcodec should access this field using:
3121 * avcodec_set_pkt_timebase(avctx)
3122 * - encoding unused.
3123 * - decodimg set by user
3125 AVRational pkt_timebase;
3129 * Code outside libavcodec should access this field using:
3130 * avcodec_get_codec_descriptior(avctx)
3131 * - encoding: unused.
3132 * - decoding: set by libavcodec.
3134 const AVCodecDescriptor *codec_descriptor;
3137 * Current statistics for PTS correction.
3138 * - decoding: maintained and used by libavcodec, not intended to be used by user apps
3139 * - encoding: unused
3141 int64_t pts_correction_num_faulty_pts; /// Number of incorrect PTS values so far
3142 int64_t pts_correction_num_faulty_dts; /// Number of incorrect DTS values so far
3143 int64_t pts_correction_last_pts; /// PTS of the last frame
3144 int64_t pts_correction_last_dts; /// DTS of the last frame
3147 * Current frame metadata.
3148 * - decoding: maintained and used by libavcodec, not intended to be used by user apps
3149 * - encoding: unused
3151 AVDictionary *metadata;
3154 AVRational av_codec_get_pkt_timebase (const AVCodecContext *avctx);
3155 void av_codec_set_pkt_timebase (AVCodecContext *avctx, AVRational val);
3157 const AVCodecDescriptor *av_codec_get_codec_descriptor(const AVCodecContext *avctx);
3158 void av_codec_set_codec_descriptor(AVCodecContext *avctx, const AVCodecDescriptor *desc);
3163 typedef struct AVProfile {
3165 const char *name; ///< short name for the profile
3168 typedef struct AVCodecDefault AVCodecDefault;
3175 typedef struct AVCodec {
3177 * Name of the codec implementation.
3178 * The name is globally unique among encoders and among decoders (but an
3179 * encoder and a decoder can share the same name).
3180 * This is the primary way to find a codec from the user perspective.
3184 * Descriptive name for the codec, meant to be more human readable than name.
3185 * You should use the NULL_IF_CONFIG_SMALL() macro to define it.
3187 const char *long_name;
3188 enum AVMediaType type;
3191 * Codec capabilities.
3195 const AVRational *supported_framerates; ///< array of supported framerates, or NULL if any, array is terminated by {0,0}
3196 const enum AVPixelFormat *pix_fmts; ///< array of supported pixel formats, or NULL if unknown, array is terminated by -1
3197 const int *supported_samplerates; ///< array of supported audio samplerates, or NULL if unknown, array is terminated by 0
3198 const enum AVSampleFormat *sample_fmts; ///< array of supported sample formats, or NULL if unknown, array is terminated by -1
3199 const uint64_t *channel_layouts; ///< array of support channel layouts, or NULL if unknown. array is terminated by 0
3200 uint8_t max_lowres; ///< maximum value for lowres supported by the decoder
3201 const AVClass *priv_class; ///< AVClass for the private context
3202 const AVProfile *profiles; ///< array of recognized profiles, or NULL if unknown, array is terminated by {FF_PROFILE_UNKNOWN}
3204 /*****************************************************************
3205 * No fields below this line are part of the public API. They
3206 * may not be used outside of libavcodec and can be changed and
3208 * New public fields should be added right above.
3209 *****************************************************************
3212 struct AVCodec *next;
3214 * @name Frame-level threading support functions
3218 * If defined, called on thread contexts when they are created.
3219 * If the codec allocates writable tables in init(), re-allocate them here.
3220 * priv_data will be set to a copy of the original.
3222 int (*init_thread_copy)(AVCodecContext *);
3224 * Copy necessary context variables from a previous thread context to the current one.
3225 * If not defined, the next thread will start automatically; otherwise, the codec
3226 * must call ff_thread_finish_setup().
3228 * dst and src will (rarely) point to the same context, in which case memcpy should be skipped.
3230 int (*update_thread_context)(AVCodecContext *dst, const AVCodecContext *src);
3234 * Private codec-specific defaults.
3236 const AVCodecDefault *defaults;
3239 * Initialize codec static data, called from avcodec_register().
3241 void (*init_static_data)(struct AVCodec *codec);
3243 int (*init)(AVCodecContext *);
3244 int (*encode_sub)(AVCodecContext *, uint8_t *buf, int buf_size,
3245 const struct AVSubtitle *sub);
3247 * Encode data to an AVPacket.
3249 * @param avctx codec context
3250 * @param avpkt output AVPacket (may contain a user-provided buffer)
3251 * @param[in] frame AVFrame containing the raw data to be encoded
3252 * @param[out] got_packet_ptr encoder sets to 0 or 1 to indicate that a
3253 * non-empty packet was returned in avpkt.
3254 * @return 0 on success, negative error code on failure
3256 int (*encode2)(AVCodecContext *avctx, AVPacket *avpkt, const AVFrame *frame,
3257 int *got_packet_ptr);
3258 int (*decode)(AVCodecContext *, void *outdata, int *outdata_size, AVPacket *avpkt);
3259 int (*close)(AVCodecContext *);
3262 * Will be called when seeking
3264 void (*flush)(AVCodecContext *);
3270 typedef struct AVHWAccel {
3272 * Name of the hardware accelerated codec.
3273 * The name is globally unique among encoders and among decoders (but an
3274 * encoder and a decoder can share the same name).
3279 * Type of codec implemented by the hardware accelerator.
3281 * See AVMEDIA_TYPE_xxx
3283 enum AVMediaType type;
3286 * Codec implemented by the hardware accelerator.
3288 * See AV_CODEC_ID_xxx
3293 * Supported pixel format.
3295 * Only hardware accelerated formats are supported here.
3297 enum AVPixelFormat pix_fmt;
3300 * Hardware accelerated codec capabilities.
3301 * see FF_HWACCEL_CODEC_CAP_*
3305 struct AVHWAccel *next;
3308 * Called at the beginning of each frame or field picture.
3310 * Meaningful frame information (codec specific) is guaranteed to
3311 * be parsed at this point. This function is mandatory.
3313 * Note that buf can be NULL along with buf_size set to 0.
3314 * Otherwise, this means the whole frame is available at this point.
3316 * @param avctx the codec context
3317 * @param buf the frame data buffer base
3318 * @param buf_size the size of the frame in bytes
3319 * @return zero if successful, a negative value otherwise
3321 int (*start_frame)(AVCodecContext *avctx, const uint8_t *buf, uint32_t buf_size);
3324 * Callback for each slice.
3326 * Meaningful slice information (codec specific) is guaranteed to
3327 * be parsed at this point. This function is mandatory.
3329 * @param avctx the codec context
3330 * @param buf the slice data buffer base
3331 * @param buf_size the size of the slice in bytes
3332 * @return zero if successful, a negative value otherwise
3334 int (*decode_slice)(AVCodecContext *avctx, const uint8_t *buf, uint32_t buf_size);
3337 * Called at the end of each frame or field picture.
3339 * The whole picture is parsed at this point and can now be sent
3340 * to the hardware accelerator. This function is mandatory.
3342 * @param avctx the codec context
3343 * @return zero if successful, a negative value otherwise
3345 int (*end_frame)(AVCodecContext *avctx);
3348 * Size of HW accelerator private data.
3350 * Private data is allocated with av_mallocz() before
3351 * AVCodecContext.get_buffer() and deallocated after
3352 * AVCodecContext.release_buffer().
3358 * @defgroup lavc_picture AVPicture
3360 * Functions for working with AVPicture
3365 * four components are given, that's all.
3366 * the last component is alpha
3368 typedef struct AVPicture {
3369 uint8_t *data[AV_NUM_DATA_POINTERS];
3370 int linesize[AV_NUM_DATA_POINTERS]; ///< number of bytes per line
3377 enum AVSubtitleType {
3380 SUBTITLE_BITMAP, ///< A bitmap, pict will be set
3383 * Plain text, the text field must be set by the decoder and is
3384 * authoritative. ass and pict fields may contain approximations.
3389 * Formatted text, the ass field must be set by the decoder and is
3390 * authoritative. pict and text fields may contain approximations.
3395 #define AV_SUBTITLE_FLAG_FORCED 0x00000001
3397 typedef struct AVSubtitleRect {
3398 int x; ///< top left corner of pict, undefined when pict is not set
3399 int y; ///< top left corner of pict, undefined when pict is not set
3400 int w; ///< width of pict, undefined when pict is not set
3401 int h; ///< height of pict, undefined when pict is not set
3402 int nb_colors; ///< number of colors in pict, undefined when pict is not set
3405 * data+linesize for the bitmap of this subtitle.
3406 * can be set for text/ass as well once they where rendered
3409 enum AVSubtitleType type;
3411 char *text; ///< 0 terminated plain UTF-8 text
3414 * 0 terminated ASS/SSA compatible event line.
3415 * The presentation of this is unaffected by the other values in this
3423 typedef struct AVSubtitle {
3424 uint16_t format; /* 0 = graphics */
3425 uint32_t start_display_time; /* relative to packet pts, in ms */
3426 uint32_t end_display_time; /* relative to packet pts, in ms */
3428 AVSubtitleRect **rects;
3429 int64_t pts; ///< Same as packet pts, in AV_TIME_BASE
3433 * If c is NULL, returns the first registered codec,
3434 * if c is non-NULL, returns the next registered codec after c,
3435 * or NULL if c is the last one.
3437 AVCodec *av_codec_next(const AVCodec *c);
3440 * Return the LIBAVCODEC_VERSION_INT constant.
3442 unsigned avcodec_version(void);
3445 * Return the libavcodec build-time configuration.
3447 const char *avcodec_configuration(void);
3450 * Return the libavcodec license.
3452 const char *avcodec_license(void);
3455 * Register the codec codec and initialize libavcodec.
3457 * @warning either this function or avcodec_register_all() must be called
3458 * before any other libavcodec functions.
3460 * @see avcodec_register_all()
3462 void avcodec_register(AVCodec *codec);
3465 * Register all the codecs, parsers and bitstream filters which were enabled at
3466 * configuration time. If you do not call this function you can select exactly
3467 * which formats you want to support, by using the individual registration
3470 * @see avcodec_register
3471 * @see av_register_codec_parser
3472 * @see av_register_bitstream_filter
3474 void avcodec_register_all(void);
3477 #if FF_API_ALLOC_CONTEXT
3479 * Allocate an AVCodecContext and set its fields to default values. The
3480 * resulting struct can be deallocated by simply calling av_free().
3482 * @return An AVCodecContext filled with default values or NULL on failure.
3483 * @see avcodec_get_context_defaults
3485 * @deprecated use avcodec_alloc_context3()
3487 attribute_deprecated
3488 AVCodecContext *avcodec_alloc_context(void);
3490 /** THIS FUNCTION IS NOT YET PART OF THE PUBLIC API!
3491 * we WILL change its arguments and name a few times! */
3492 attribute_deprecated
3493 AVCodecContext *avcodec_alloc_context2(enum AVMediaType);
3496 * Set the fields of the given AVCodecContext to default values.
3498 * @param s The AVCodecContext of which the fields should be set to default values.
3499 * @deprecated use avcodec_get_context_defaults3
3501 attribute_deprecated
3502 void avcodec_get_context_defaults(AVCodecContext *s);
3504 /** THIS FUNCTION IS NOT YET PART OF THE PUBLIC API!
3505 * we WILL change its arguments and name a few times! */
3506 attribute_deprecated
3507 void avcodec_get_context_defaults2(AVCodecContext *s, enum AVMediaType);
3511 * Allocate an AVCodecContext and set its fields to default values. The
3512 * resulting struct can be deallocated by calling avcodec_close() on it followed
3515 * @param codec if non-NULL, allocate private data and initialize defaults
3516 * for the given codec. It is illegal to then call avcodec_open2()
3517 * with a different codec.
3518 * If NULL, then the codec-specific defaults won't be initialized,
3519 * which may result in suboptimal default settings (this is
3520 * important mainly for encoders, e.g. libx264).
3522 * @return An AVCodecContext filled with default values or NULL on failure.
3523 * @see avcodec_get_context_defaults
3525 AVCodecContext *avcodec_alloc_context3(const AVCodec *codec);
3528 * Set the fields of the given AVCodecContext to default values corresponding
3529 * to the given codec (defaults may be codec-dependent).
3531 * Do not call this function if a non-NULL codec has been passed
3532 * to avcodec_alloc_context3() that allocated this AVCodecContext.
3533 * If codec is non-NULL, it is illegal to call avcodec_open2() with a
3534 * different codec on this AVCodecContext.
3536 int avcodec_get_context_defaults3(AVCodecContext *s, const AVCodec *codec);
3539 * Get the AVClass for AVCodecContext. It can be used in combination with
3540 * AV_OPT_SEARCH_FAKE_OBJ for examining options.
3542 * @see av_opt_find().
3544 const AVClass *avcodec_get_class(void);
3547 * Get the AVClass for AVFrame. It can be used in combination with
3548 * AV_OPT_SEARCH_FAKE_OBJ for examining options.
3550 * @see av_opt_find().
3552 const AVClass *avcodec_get_frame_class(void);
3555 * Get the AVClass for AVSubtitleRect. It can be used in combination with
3556 * AV_OPT_SEARCH_FAKE_OBJ for examining options.
3558 * @see av_opt_find().
3560 const AVClass *avcodec_get_subtitle_rect_class(void);
3563 * Copy the settings of the source AVCodecContext into the destination
3564 * AVCodecContext. The resulting destination codec context will be
3565 * unopened, i.e. you are required to call avcodec_open2() before you
3566 * can use this AVCodecContext to decode/encode video/audio data.
3568 * @param dest target codec context, should be initialized with
3569 * avcodec_alloc_context3(), but otherwise uninitialized
3570 * @param src source codec context
3571 * @return AVERROR() on error (e.g. memory allocation error), 0 on success
3573 int avcodec_copy_context(AVCodecContext *dest, const AVCodecContext *src);
3576 * Allocate an AVFrame and set its fields to default values. The resulting
3577 * struct must be freed using avcodec_free_frame().
3579 * @return An AVFrame filled with default values or NULL on failure.
3580 * @see avcodec_get_frame_defaults
3582 AVFrame *avcodec_alloc_frame(void);
3585 * Set the fields of the given AVFrame to default values.
3587 * @param frame The AVFrame of which the fields should be set to default values.
3589 void avcodec_get_frame_defaults(AVFrame *frame);
3592 * Free the frame and any dynamically allocated objects in it,
3593 * e.g. extended_data.
3595 * @param frame frame to be freed. The pointer will be set to NULL.
3597 * @warning this function does NOT free the data buffers themselves
3598 * (it does not know how, since they might have been allocated with
3599 * a custom get_buffer()).
3601 void avcodec_free_frame(AVFrame **frame);
3603 #if FF_API_AVCODEC_OPEN
3605 * Initialize the AVCodecContext to use the given AVCodec. Prior to using this
3606 * function the context has to be allocated.
3608 * The functions avcodec_find_decoder_by_name(), avcodec_find_encoder_by_name(),
3609 * avcodec_find_decoder() and avcodec_find_encoder() provide an easy way for
3610 * retrieving a codec.
3612 * @warning This function is not thread safe!
3615 * avcodec_register_all();
3616 * codec = avcodec_find_decoder(AV_CODEC_ID_H264);
3620 * context = avcodec_alloc_context3(codec);
3622 * if (avcodec_open(context, codec) < 0)
3626 * @param avctx The context which will be set up to use the given codec.
3627 * @param codec The codec to use within the context.
3628 * @return zero on success, a negative value on error
3629 * @see avcodec_alloc_context3, avcodec_find_decoder, avcodec_find_encoder, avcodec_close
3631 * @deprecated use avcodec_open2
3633 attribute_deprecated
3634 int avcodec_open(AVCodecContext *avctx, AVCodec *codec);
3638 * Initialize the AVCodecContext to use the given AVCodec. Prior to using this
3639 * function the context has to be allocated with avcodec_alloc_context3().
3641 * The functions avcodec_find_decoder_by_name(), avcodec_find_encoder_by_name(),
3642 * avcodec_find_decoder() and avcodec_find_encoder() provide an easy way for
3643 * retrieving a codec.
3645 * @warning This function is not thread safe!
3648 * avcodec_register_all();
3649 * av_dict_set(&opts, "b", "2.5M", 0);
3650 * codec = avcodec_find_decoder(AV_CODEC_ID_H264);
3654 * context = avcodec_alloc_context3(codec);
3656 * if (avcodec_open2(context, codec, opts) < 0)
3660 * @param avctx The context to initialize.
3661 * @param codec The codec to open this context for. If a non-NULL codec has been
3662 * previously passed to avcodec_alloc_context3() or
3663 * avcodec_get_context_defaults3() for this context, then this
3664 * parameter MUST be either NULL or equal to the previously passed
3666 * @param options A dictionary filled with AVCodecContext and codec-private options.
3667 * On return this object will be filled with options that were not found.
3669 * @return zero on success, a negative value on error
3670 * @see avcodec_alloc_context3(), avcodec_find_decoder(), avcodec_find_encoder(),
3671 * av_dict_set(), av_opt_find().
3673 int avcodec_open2(AVCodecContext *avctx, const AVCodec *codec, AVDictionary **options);
3676 * Close a given AVCodecContext and free all the data associated with it
3677 * (but not the AVCodecContext itself).
3679 * Calling this function on an AVCodecContext that hasn't been opened will free
3680 * the codec-specific data allocated in avcodec_alloc_context3() /
3681 * avcodec_get_context_defaults3() with a non-NULL codec. Subsequent calls will
3684 int avcodec_close(AVCodecContext *avctx);
3687 * Free all allocated data in the given subtitle struct.
3689 * @param sub AVSubtitle to free.
3691 void avsubtitle_free(AVSubtitle *sub);
3698 * @addtogroup lavc_packet
3703 * Default packet destructor.
3705 void av_destruct_packet(AVPacket *pkt);
3708 * Initialize optional fields of a packet with default values.
3710 * Note, this does not touch the data and size members, which have to be
3711 * initialized separately.
3715 void av_init_packet(AVPacket *pkt);
3718 * Allocate the payload of a packet and initialize its fields with
3722 * @param size wanted payload size
3723 * @return 0 if OK, AVERROR_xxx otherwise
3725 int av_new_packet(AVPacket *pkt, int size);
3728 * Reduce packet size, correctly zeroing padding
3731 * @param size new size
3733 void av_shrink_packet(AVPacket *pkt, int size);
3736 * Increase packet size, correctly zeroing padding
3739 * @param grow_by number of bytes by which to increase the size of the packet
3741 int av_grow_packet(AVPacket *pkt, int grow_by);
3744 * @warning This is a hack - the packet memory allocation stuff is broken. The
3745 * packet is allocated if it was not really allocated.
3747 int av_dup_packet(AVPacket *pkt);
3750 * Copy packet, including contents
3752 * @return 0 on success, negative AVERROR on fail
3754 int av_copy_packet(AVPacket *dst, AVPacket *src);
3759 * @param pkt packet to free
3761 void av_free_packet(AVPacket *pkt);
3764 * Allocate new information of a packet.
3767 * @param type side information type
3768 * @param size side information size
3769 * @return pointer to fresh allocated data or NULL otherwise
3771 uint8_t* av_packet_new_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
3775 * Shrink the already allocated side data buffer
3778 * @param type side information type
3779 * @param size new side information size
3780 * @return 0 on success, < 0 on failure
3782 int av_packet_shrink_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
3786 * Get side information from packet.
3789 * @param type desired side information type
3790 * @param size pointer for side information size to store (optional)
3791 * @return pointer to data if present or NULL otherwise
3793 uint8_t* av_packet_get_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
3796 int av_packet_merge_side_data(AVPacket *pkt);
3798 int av_packet_split_side_data(AVPacket *pkt);
3806 * @addtogroup lavc_decoding
3811 * Find a registered decoder with a matching codec ID.
3813 * @param id AVCodecID of the requested decoder
3814 * @return A decoder if one was found, NULL otherwise.
3816 AVCodec *avcodec_find_decoder(enum AVCodecID id);
3819 * Find a registered decoder with the specified name.
3821 * @param name name of the requested decoder
3822 * @return A decoder if one was found, NULL otherwise.
3824 AVCodec *avcodec_find_decoder_by_name(const char *name);
3826 int avcodec_default_get_buffer(AVCodecContext *s, AVFrame *pic);
3827 void avcodec_default_release_buffer(AVCodecContext *s, AVFrame *pic);
3828 int avcodec_default_reget_buffer(AVCodecContext *s, AVFrame *pic);
3831 * Return the amount of padding in pixels which the get_buffer callback must
3832 * provide around the edge of the image for codecs which do not have the
3833 * CODEC_FLAG_EMU_EDGE flag.
3835 * @return Required padding in pixels.
3837 unsigned avcodec_get_edge_width(void);
3840 * Modify width and height values so that they will result in a memory
3841 * buffer that is acceptable for the codec if you do not use any horizontal
3844 * May only be used if a codec with CODEC_CAP_DR1 has been opened.
3845 * If CODEC_FLAG_EMU_EDGE is not set, the dimensions must have been increased
3846 * according to avcodec_get_edge_width() before.
3848 void avcodec_align_dimensions(AVCodecContext *s, int *width, int *height);
3851 * Modify width and height values so that they will result in a memory
3852 * buffer that is acceptable for the codec if you also ensure that all
3853 * line sizes are a multiple of the respective linesize_align[i].
3855 * May only be used if a codec with CODEC_CAP_DR1 has been opened.
3856 * If CODEC_FLAG_EMU_EDGE is not set, the dimensions must have been increased
3857 * according to avcodec_get_edge_width() before.
3859 void avcodec_align_dimensions2(AVCodecContext *s, int *width, int *height,
3860 int linesize_align[AV_NUM_DATA_POINTERS]);
3862 #if FF_API_OLD_DECODE_AUDIO
3864 * Wrapper function which calls avcodec_decode_audio4.
3866 * @deprecated Use avcodec_decode_audio4 instead.
3868 * Decode the audio frame of size avpkt->size from avpkt->data into samples.
3869 * Some decoders may support multiple frames in a single AVPacket, such
3870 * decoders would then just decode the first frame. In this case,
3871 * avcodec_decode_audio3 has to be called again with an AVPacket that contains
3872 * the remaining data in order to decode the second frame etc.
3874 * could be outputted, frame_size_ptr is zero. Otherwise, it is the
3875 * decompressed frame size in bytes.
3877 * @warning You must set frame_size_ptr to the allocated size of the
3878 * output buffer before calling avcodec_decode_audio3().
3880 * @warning The input buffer must be FF_INPUT_BUFFER_PADDING_SIZE larger than
3881 * the actual read bytes because some optimized bitstream readers read 32 or 64
3882 * bits at once and could read over the end.
3884 * @warning The end of the input buffer avpkt->data should be set to 0 to ensure that
3885 * no overreading happens for damaged MPEG streams.
3887 * @warning You must not provide a custom get_buffer() when using
3888 * avcodec_decode_audio3(). Doing so will override it with
3889 * avcodec_default_get_buffer. Use avcodec_decode_audio4() instead,
3890 * which does allow the application to provide a custom get_buffer().
3892 * @note You might have to align the input buffer avpkt->data and output buffer
3893 * samples. The alignment requirements depend on the CPU: On some CPUs it isn't
3894 * necessary at all, on others it won't work at all if not aligned and on others
3895 * it will work but it will have an impact on performance.
3897 * In practice, avpkt->data should have 4 byte alignment at minimum and
3898 * samples should be 16 byte aligned unless the CPU doesn't need it
3899 * (AltiVec and SSE do).
3901 * @note Codecs which have the CODEC_CAP_DELAY capability set have a delay
3902 * between input and output, these need to be fed with avpkt->data=NULL,
3903 * avpkt->size=0 at the end to return the remaining frames.
3905 * @param avctx the codec context
3906 * @param[out] samples the output buffer, sample type in avctx->sample_fmt
3907 * If the sample format is planar, each channel plane will
3908 * be the same size, with no padding between channels.
3909 * @param[in,out] frame_size_ptr the output buffer size in bytes
3910 * @param[in] avpkt The input AVPacket containing the input buffer.
3911 * You can create such packet with av_init_packet() and by then setting
3912 * data and size, some decoders might in addition need other fields.
3913 * All decoders are designed to use the least fields possible though.
3914 * @return On error a negative value is returned, otherwise the number of bytes
3915 * used or zero if no frame data was decompressed (used) from the input AVPacket.
3917 attribute_deprecated int avcodec_decode_audio3(AVCodecContext *avctx, int16_t *samples,
3918 int *frame_size_ptr,
3923 * Decode the audio frame of size avpkt->size from avpkt->data into frame.
3925 * Some decoders may support multiple frames in a single AVPacket. Such
3926 * decoders would then just decode the first frame. In this case,
3927 * avcodec_decode_audio4 has to be called again with an AVPacket containing
3928 * the remaining data in order to decode the second frame, etc...
3929 * Even if no frames are returned, the packet needs to be fed to the decoder
3930 * with remaining data until it is completely consumed or an error occurs.
3932 * @warning The input buffer, avpkt->data must be FF_INPUT_BUFFER_PADDING_SIZE
3933 * larger than the actual read bytes because some optimized bitstream
3934 * readers read 32 or 64 bits at once and could read over the end.
3936 * @note You might have to align the input buffer. The alignment requirements
3937 * depend on the CPU and the decoder.
3939 * @param avctx the codec context
3940 * @param[out] frame The AVFrame in which to store decoded audio samples.
3941 * Decoders request a buffer of a particular size by setting
3942 * AVFrame.nb_samples prior to calling get_buffer(). The
3943 * decoder may, however, only utilize part of the buffer by
3944 * setting AVFrame.nb_samples to a smaller value in the
3946 * @param[out] got_frame_ptr Zero if no frame could be decoded, otherwise it is
3948 * @param[in] avpkt The input AVPacket containing the input buffer.
3949 * At least avpkt->data and avpkt->size should be set. Some
3950 * decoders might also require additional fields to be set.
3951 * @return A negative error code is returned if an error occurred during
3952 * decoding, otherwise the number of bytes consumed from the input
3953 * AVPacket is returned.
3955 int avcodec_decode_audio4(AVCodecContext *avctx, AVFrame *frame,
3956 int *got_frame_ptr, const AVPacket *avpkt);
3959 * Decode the video frame of size avpkt->size from avpkt->data into picture.
3960 * Some decoders may support multiple frames in a single AVPacket, such
3961 * decoders would then just decode the first frame.
3963 * @warning The input buffer must be FF_INPUT_BUFFER_PADDING_SIZE larger than
3964 * the actual read bytes because some optimized bitstream readers read 32 or 64
3965 * bits at once and could read over the end.
3967 * @warning The end of the input buffer buf should be set to 0 to ensure that
3968 * no overreading happens for damaged MPEG streams.
3970 * @note You might have to align the input buffer avpkt->data.
3971 * The alignment requirements depend on the CPU: on some CPUs it isn't
3972 * necessary at all, on others it won't work at all if not aligned and on others
3973 * it will work but it will have an impact on performance.
3975 * In practice, avpkt->data should have 4 byte alignment at minimum.
3977 * @note Codecs which have the CODEC_CAP_DELAY capability set have a delay
3978 * between input and output, these need to be fed with avpkt->data=NULL,
3979 * avpkt->size=0 at the end to return the remaining frames.
3981 * @param avctx the codec context
3982 * @param[out] picture The AVFrame in which the decoded video frame will be stored.
3983 * Use avcodec_alloc_frame to get an AVFrame, the codec will
3984 * allocate memory for the actual bitmap.
3985 * with default get/release_buffer(), the decoder frees/reuses the bitmap as it sees fit.
3986 * with overridden get/release_buffer() (needs CODEC_CAP_DR1) the user decides into what buffer the decoder
3987 * decodes and the decoder tells the user once it does not need the data anymore,
3988 * the user app can at this point free/reuse/keep the memory as it sees fit.
3990 * @param[in] avpkt The input AVpacket containing the input buffer.
3991 * You can create such packet with av_init_packet() and by then setting
3992 * data and size, some decoders might in addition need other fields like
3993 * flags&AV_PKT_FLAG_KEY. All decoders are designed to use the least
3995 * @param[in,out] got_picture_ptr Zero if no frame could be decompressed, otherwise, it is nonzero.
3996 * @return On error a negative value is returned, otherwise the number of bytes
3997 * used or zero if no frame could be decompressed.
3999 int avcodec_decode_video2(AVCodecContext *avctx, AVFrame *picture,
4000 int *got_picture_ptr,
4001 const AVPacket *avpkt);
4004 * Decode a subtitle message.
4005 * Return a negative value on error, otherwise return the number of bytes used.
4006 * If no subtitle could be decompressed, got_sub_ptr is zero.
4007 * Otherwise, the subtitle is stored in *sub.
4008 * Note that CODEC_CAP_DR1 is not available for subtitle codecs. This is for
4009 * simplicity, because the performance difference is expect to be negligible
4010 * and reusing a get_buffer written for video codecs would probably perform badly
4011 * due to a potentially very different allocation pattern.
4013 * @param avctx the codec context
4014 * @param[out] sub The AVSubtitle in which the decoded subtitle will be stored, must be
4015 freed with avsubtitle_free if *got_sub_ptr is set.
4016 * @param[in,out] got_sub_ptr Zero if no subtitle could be decompressed, otherwise, it is nonzero.
4017 * @param[in] avpkt The input AVPacket containing the input buffer.
4019 int avcodec_decode_subtitle2(AVCodecContext *avctx, AVSubtitle *sub,
4024 * @defgroup lavc_parsing Frame parsing
4028 typedef struct AVCodecParserContext {
4030 struct AVCodecParser *parser;
4031 int64_t frame_offset; /* offset of the current frame */
4032 int64_t cur_offset; /* current offset
4033 (incremented by each av_parser_parse()) */
4034 int64_t next_frame_offset; /* offset of the next frame */
4036 int pict_type; /* XXX: Put it back in AVCodecContext. */
4038 * This field is used for proper frame duration computation in lavf.
4039 * It signals, how much longer the frame duration of the current frame
4040 * is compared to normal frame duration.
4042 * frame_duration = (1 + repeat_pict) * time_base
4044 * It is used by codecs like H.264 to display telecined material.
4046 int repeat_pict; /* XXX: Put it back in AVCodecContext. */
4047 int64_t pts; /* pts of the current frame */
4048 int64_t dts; /* dts of the current frame */
4053 int fetch_timestamp;
4055 #define AV_PARSER_PTS_NB 4
4056 int cur_frame_start_index;
4057 int64_t cur_frame_offset[AV_PARSER_PTS_NB];
4058 int64_t cur_frame_pts[AV_PARSER_PTS_NB];
4059 int64_t cur_frame_dts[AV_PARSER_PTS_NB];
4062 #define PARSER_FLAG_COMPLETE_FRAMES 0x0001
4063 #define PARSER_FLAG_ONCE 0x0002
4064 /// Set if the parser has a valid file offset
4065 #define PARSER_FLAG_FETCHED_OFFSET 0x0004
4066 #define PARSER_FLAG_USE_CODEC_TS 0x1000
4068 int64_t offset; ///< byte offset from starting packet start
4069 int64_t cur_frame_end[AV_PARSER_PTS_NB];
4072 * Set by parser to 1 for key frames and 0 for non-key frames.
4073 * It is initialized to -1, so if the parser doesn't set this flag,
4074 * old-style fallback using AV_PICTURE_TYPE_I picture type as key frames
4080 * Time difference in stream time base units from the pts of this
4081 * packet to the point at which the output from the decoder has converged
4082 * independent from the availability of previous frames. That is, the
4083 * frames are virtually identical no matter if decoding started from
4084 * the very first frame or from this keyframe.
4085 * Is AV_NOPTS_VALUE if unknown.
4086 * This field is not the display duration of the current frame.
4087 * This field has no meaning if the packet does not have AV_PKT_FLAG_KEY
4090 * The purpose of this field is to allow seeking in streams that have no
4091 * keyframes in the conventional sense. It corresponds to the
4092 * recovery point SEI in H.264 and match_time_delta in NUT. It is also
4093 * essential for some types of subtitle streams to ensure that all
4094 * subtitles are correctly displayed after seeking.
4096 int64_t convergence_duration;
4098 // Timestamp generation support:
4100 * Synchronization point for start of timestamp generation.
4102 * Set to >0 for sync point, 0 for no sync point and <0 for undefined
4105 * For example, this corresponds to presence of H.264 buffering period
4111 * Offset of the current timestamp against last timestamp sync point in
4112 * units of AVCodecContext.time_base.
4114 * Set to INT_MIN when dts_sync_point unused. Otherwise, it must
4115 * contain a valid timestamp offset.
4117 * Note that the timestamp of sync point has usually a nonzero
4118 * dts_ref_dts_delta, which refers to the previous sync point. Offset of
4119 * the next frame after timestamp sync point will be usually 1.
4121 * For example, this corresponds to H.264 cpb_removal_delay.
4123 int dts_ref_dts_delta;
4126 * Presentation delay of current frame in units of AVCodecContext.time_base.
4128 * Set to INT_MIN when dts_sync_point unused. Otherwise, it must
4129 * contain valid non-negative timestamp delta (presentation time of a frame
4130 * must not lie in the past).
4132 * This delay represents the difference between decoding and presentation
4133 * time of the frame.
4135 * For example, this corresponds to H.264 dpb_output_delay.
4140 * Position of the packet in file.
4142 * Analogous to cur_frame_pts/dts
4144 int64_t cur_frame_pos[AV_PARSER_PTS_NB];
4147 * Byte position of currently parsed frame in stream.
4152 * Previous frame byte position.
4157 * Duration of the current frame.
4158 * For audio, this is in units of 1 / AVCodecContext.sample_rate.
4159 * For all other types, this is in units of AVCodecContext.time_base.
4162 } AVCodecParserContext;
4164 typedef struct AVCodecParser {
4165 int codec_ids[5]; /* several codec IDs are permitted */
4167 int (*parser_init)(AVCodecParserContext *s);
4168 int (*parser_parse)(AVCodecParserContext *s,
4169 AVCodecContext *avctx,
4170 const uint8_t **poutbuf, int *poutbuf_size,
4171 const uint8_t *buf, int buf_size);
4172 void (*parser_close)(AVCodecParserContext *s);
4173 int (*split)(AVCodecContext *avctx, const uint8_t *buf, int buf_size);
4174 struct AVCodecParser *next;
4177 AVCodecParser *av_parser_next(AVCodecParser *c);
4179 void av_register_codec_parser(AVCodecParser *parser);
4180 AVCodecParserContext *av_parser_init(int codec_id);
4185 * @param s parser context.
4186 * @param avctx codec context.
4187 * @param poutbuf set to pointer to parsed buffer or NULL if not yet finished.
4188 * @param poutbuf_size set to size of parsed buffer or zero if not yet finished.
4189 * @param buf input buffer.
4190 * @param buf_size input length, to signal EOF, this should be 0 (so that the last frame can be output).
4191 * @param pts input presentation timestamp.
4192 * @param dts input decoding timestamp.
4193 * @param pos input byte position in stream.
4194 * @return the number of bytes of the input bitstream used.
4199 * len = av_parser_parse2(myparser, AVCodecContext, &data, &size,
4206 * decode_frame(data, size);
4210 int av_parser_parse2(AVCodecParserContext *s,
4211 AVCodecContext *avctx,
4212 uint8_t **poutbuf, int *poutbuf_size,
4213 const uint8_t *buf, int buf_size,
4214 int64_t pts, int64_t dts,
4218 * @return 0 if the output buffer is a subset of the input, 1 if it is allocated and must be freed
4219 * @deprecated use AVBitstreamFilter
4221 int av_parser_change(AVCodecParserContext *s,
4222 AVCodecContext *avctx,
4223 uint8_t **poutbuf, int *poutbuf_size,
4224 const uint8_t *buf, int buf_size, int keyframe);
4225 void av_parser_close(AVCodecParserContext *s);
4233 * @addtogroup lavc_encoding
4238 * Find a registered encoder with a matching codec ID.
4240 * @param id AVCodecID of the requested encoder
4241 * @return An encoder if one was found, NULL otherwise.
4243 AVCodec *avcodec_find_encoder(enum AVCodecID id);
4246 * Find a registered encoder with the specified name.
4248 * @param name name of the requested encoder
4249 * @return An encoder if one was found, NULL otherwise.
4251 AVCodec *avcodec_find_encoder_by_name(const char *name);
4253 #if FF_API_OLD_ENCODE_AUDIO
4255 * Encode an audio frame from samples into buf.
4257 * @deprecated Use avcodec_encode_audio2 instead.
4259 * @note The output buffer should be at least FF_MIN_BUFFER_SIZE bytes large.
4260 * However, for codecs with avctx->frame_size equal to 0 (e.g. PCM) the user
4261 * will know how much space is needed because it depends on the value passed
4262 * in buf_size as described below. In that case a lower value can be used.
4264 * @param avctx the codec context
4265 * @param[out] buf the output buffer
4266 * @param[in] buf_size the output buffer size
4267 * @param[in] samples the input buffer containing the samples
4268 * The number of samples read from this buffer is frame_size*channels,
4269 * both of which are defined in avctx.
4270 * For codecs which have avctx->frame_size equal to 0 (e.g. PCM) the number of
4271 * samples read from samples is equal to:
4272 * buf_size * 8 / (avctx->channels * av_get_bits_per_sample(avctx->codec_id))
4273 * This also implies that av_get_bits_per_sample() must not return 0 for these
4275 * @return On error a negative value is returned, on success zero or the number
4276 * of bytes used to encode the data read from the input buffer.
4278 int attribute_deprecated avcodec_encode_audio(AVCodecContext *avctx,
4279 uint8_t *buf, int buf_size,
4280 const short *samples);
4284 * Encode a frame of audio.
4286 * Takes input samples from frame and writes the next output packet, if
4287 * available, to avpkt. The output packet does not necessarily contain data for
4288 * the most recent frame, as encoders can delay, split, and combine input frames
4289 * internally as needed.
4291 * @param avctx codec context
4292 * @param avpkt output AVPacket.
4293 * The user can supply an output buffer by setting
4294 * avpkt->data and avpkt->size prior to calling the
4295 * function, but if the size of the user-provided data is not
4296 * large enough, encoding will fail. If avpkt->data and
4297 * avpkt->size are set, avpkt->destruct must also be set. All
4298 * other AVPacket fields will be reset by the encoder using
4299 * av_init_packet(). If avpkt->data is NULL, the encoder will
4300 * allocate it. The encoder will set avpkt->size to the size
4301 * of the output packet.
4303 * If this function fails or produces no output, avpkt will be
4304 * freed using av_free_packet() (i.e. avpkt->destruct will be
4305 * called to free the user supplied buffer).
4306 * @param[in] frame AVFrame containing the raw audio data to be encoded.
4307 * May be NULL when flushing an encoder that has the
4308 * CODEC_CAP_DELAY capability set.
4309 * If CODEC_CAP_VARIABLE_FRAME_SIZE is set, then each frame
4310 * can have any number of samples.
4311 * If it is not set, frame->nb_samples must be equal to
4312 * avctx->frame_size for all frames except the last.
4313 * The final frame may be smaller than avctx->frame_size.
4314 * @param[out] got_packet_ptr This field is set to 1 by libavcodec if the
4315 * output packet is non-empty, and to 0 if it is
4316 * empty. If the function returns an error, the
4317 * packet can be assumed to be invalid, and the
4318 * value of got_packet_ptr is undefined and should
4320 * @return 0 on success, negative error code on failure
4322 int avcodec_encode_audio2(AVCodecContext *avctx, AVPacket *avpkt,
4323 const AVFrame *frame, int *got_packet_ptr);
4325 #if FF_API_OLD_ENCODE_VIDEO
4327 * @deprecated use avcodec_encode_video2() instead.
4329 * Encode a video frame from pict into buf.
4330 * The input picture should be
4331 * stored using a specific format, namely avctx.pix_fmt.
4333 * @param avctx the codec context
4334 * @param[out] buf the output buffer for the bitstream of encoded frame
4335 * @param[in] buf_size the size of the output buffer in bytes
4336 * @param[in] pict the input picture to encode
4337 * @return On error a negative value is returned, on success zero or the number
4338 * of bytes used from the output buffer.
4340 attribute_deprecated
4341 int avcodec_encode_video(AVCodecContext *avctx, uint8_t *buf, int buf_size,
4342 const AVFrame *pict);
4346 * Encode a frame of video.
4348 * Takes input raw video data from frame and writes the next output packet, if
4349 * available, to avpkt. The output packet does not necessarily contain data for
4350 * the most recent frame, as encoders can delay and reorder input frames
4351 * internally as needed.
4353 * @param avctx codec context
4354 * @param avpkt output AVPacket.
4355 * The user can supply an output buffer by setting
4356 * avpkt->data and avpkt->size prior to calling the
4357 * function, but if the size of the user-provided data is not
4358 * large enough, encoding will fail. All other AVPacket fields
4359 * will be reset by the encoder using av_init_packet(). If
4360 * avpkt->data is NULL, the encoder will allocate it.
4361 * The encoder will set avpkt->size to the size of the
4362 * output packet. The returned data (if any) belongs to the
4363 * caller, he is responsible for freeing it.
4365 * If this function fails or produces no output, avpkt will be
4366 * freed using av_free_packet() (i.e. avpkt->destruct will be
4367 * called to free the user supplied buffer).
4368 * @param[in] frame AVFrame containing the raw video data to be encoded.
4369 * May be NULL when flushing an encoder that has the
4370 * CODEC_CAP_DELAY capability set.
4371 * @param[out] got_packet_ptr This field is set to 1 by libavcodec if the
4372 * output packet is non-empty, and to 0 if it is
4373 * empty. If the function returns an error, the
4374 * packet can be assumed to be invalid, and the
4375 * value of got_packet_ptr is undefined and should
4377 * @return 0 on success, negative error code on failure
4379 int avcodec_encode_video2(AVCodecContext *avctx, AVPacket *avpkt,
4380 const AVFrame *frame, int *got_packet_ptr);
4382 int avcodec_encode_subtitle(AVCodecContext *avctx, uint8_t *buf, int buf_size,
4383 const AVSubtitle *sub);
4390 #if FF_API_AVCODEC_RESAMPLE
4392 * @defgroup lavc_resample Audio resampling
4394 * @deprecated use libswresample instead
4398 struct ReSampleContext;
4399 struct AVResampleContext;
4401 typedef struct ReSampleContext ReSampleContext;
4404 * Initialize audio resampling context.
4406 * @param output_channels number of output channels
4407 * @param input_channels number of input channels
4408 * @param output_rate output sample rate
4409 * @param input_rate input sample rate
4410 * @param sample_fmt_out requested output sample format
4411 * @param sample_fmt_in input sample format
4412 * @param filter_length length of each FIR filter in the filterbank relative to the cutoff frequency
4413 * @param log2_phase_count log2 of the number of entries in the polyphase filterbank
4414 * @param linear if 1 then the used FIR filter will be linearly interpolated
4415 between the 2 closest, if 0 the closest will be used
4416 * @param cutoff cutoff frequency, 1.0 corresponds to half the output sampling rate
4417 * @return allocated ReSampleContext, NULL if error occurred
4419 attribute_deprecated
4420 ReSampleContext *av_audio_resample_init(int output_channels, int input_channels,
4421 int output_rate, int input_rate,
4422 enum AVSampleFormat sample_fmt_out,
4423 enum AVSampleFormat sample_fmt_in,
4424 int filter_length, int log2_phase_count,
4425 int linear, double cutoff);
4427 attribute_deprecated
4428 int audio_resample(ReSampleContext *s, short *output, short *input, int nb_samples);
4431 * Free resample context.
4433 * @param s a non-NULL pointer to a resample context previously
4434 * created with av_audio_resample_init()
4436 attribute_deprecated
4437 void audio_resample_close(ReSampleContext *s);
4441 * Initialize an audio resampler.
4442 * Note, if either rate is not an integer then simply scale both rates up so they are.
4443 * @param filter_length length of each FIR filter in the filterbank relative to the cutoff freq
4444 * @param log2_phase_count log2 of the number of entries in the polyphase filterbank
4445 * @param linear If 1 then the used FIR filter will be linearly interpolated
4446 between the 2 closest, if 0 the closest will be used
4447 * @param cutoff cutoff frequency, 1.0 corresponds to half the output sampling rate
4449 attribute_deprecated
4450 struct AVResampleContext *av_resample_init(int out_rate, int in_rate, int filter_length, int log2_phase_count, int linear, double cutoff);
4453 * Resample an array of samples using a previously configured context.
4454 * @param src an array of unconsumed samples
4455 * @param consumed the number of samples of src which have been consumed are returned here
4456 * @param src_size the number of unconsumed samples available
4457 * @param dst_size the amount of space in samples available in dst
4458 * @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.
4459 * @return the number of samples written in dst or -1 if an error occurred
4461 attribute_deprecated
4462 int av_resample(struct AVResampleContext *c, short *dst, short *src, int *consumed, int src_size, int dst_size, int update_ctx);
4466 * Compensate samplerate/timestamp drift. The compensation is done by changing
4467 * the resampler parameters, so no audible clicks or similar distortions occur
4468 * @param compensation_distance distance in output samples over which the compensation should be performed
4469 * @param sample_delta number of output samples which should be output less
4471 * example: av_resample_compensate(c, 10, 500)
4472 * here instead of 510 samples only 500 samples would be output
4474 * note, due to rounding the actual compensation might be slightly different,
4475 * especially if the compensation_distance is large and the in_rate used during init is small
4477 attribute_deprecated
4478 void av_resample_compensate(struct AVResampleContext *c, int sample_delta, int compensation_distance);
4479 attribute_deprecated
4480 void av_resample_close(struct AVResampleContext *c);
4488 * @addtogroup lavc_picture
4493 * Allocate memory for a picture. Call avpicture_free() to free it.
4495 * @see avpicture_fill()
4497 * @param picture the picture to be filled in
4498 * @param pix_fmt the format of the picture
4499 * @param width the width of the picture
4500 * @param height the height of the picture
4501 * @return zero if successful, a negative value if not
4503 int avpicture_alloc(AVPicture *picture, enum AVPixelFormat pix_fmt, int width, int height);
4506 * Free a picture previously allocated by avpicture_alloc().
4507 * The data buffer used by the AVPicture is freed, but the AVPicture structure
4510 * @param picture the AVPicture to be freed
4512 void avpicture_free(AVPicture *picture);
4515 * Fill in the AVPicture fields, always assume a linesize alignment of
4518 * @see av_image_fill_arrays()
4520 int avpicture_fill(AVPicture *picture, const uint8_t *ptr,
4521 enum AVPixelFormat pix_fmt, int width, int height);
4524 * Copy pixel data from an AVPicture into a buffer, always assume a
4525 * linesize alignment of 1.
4527 * @see av_image_copy_to_buffer()
4529 int avpicture_layout(const AVPicture* src, enum AVPixelFormat pix_fmt,
4530 int width, int height,
4531 unsigned char *dest, int dest_size);
4534 * Calculate the size in bytes that a picture of the given width and height
4535 * would occupy if stored in the given picture format.
4536 * Always assume a linesize alignment of 1.
4538 * @see av_image_get_buffer_size().
4540 int avpicture_get_size(enum AVPixelFormat pix_fmt, int width, int height);
4543 * deinterlace - if not supported return -1
4545 int avpicture_deinterlace(AVPicture *dst, const AVPicture *src,
4546 enum AVPixelFormat pix_fmt, int width, int height);
4548 * Copy image src to dst. Wraps av_image_copy().
4550 void av_picture_copy(AVPicture *dst, const AVPicture *src,
4551 enum AVPixelFormat pix_fmt, int width, int height);
4554 * Crop image top and left side.
4556 int av_picture_crop(AVPicture *dst, const AVPicture *src,
4557 enum AVPixelFormat pix_fmt, int top_band, int left_band);
4562 int av_picture_pad(AVPicture *dst, const AVPicture *src, int height, int width, enum AVPixelFormat pix_fmt,
4563 int padtop, int padbottom, int padleft, int padright, int *color);
4570 * @defgroup lavc_misc Utility functions
4573 * Miscellaneous utility functions related to both encoding and decoding
4579 * @defgroup lavc_misc_pixfmt Pixel formats
4581 * Functions for working with pixel formats.
4586 * Utility function to access log2_chroma_w log2_chroma_h from
4587 * the pixel format AVPixFmtDescriptor.
4589 * This function asserts that pix_fmt is valid. See av_pix_fmt_get_chroma_sub_sample
4590 * for one that returns a failure code and continues in case of invalid
4593 * @param[in] pix_fmt the pixel format
4594 * @param[out] h_shift store log2_chroma_h
4595 * @param[out] v_shift store log2_chroma_w
4597 * @see av_pix_fmt_get_chroma_sub_sample
4600 void avcodec_get_chroma_sub_sample(enum AVPixelFormat pix_fmt, int *h_shift, int *v_shift);
4603 * Return a value representing the fourCC code associated to the
4604 * pixel format pix_fmt, or 0 if no associated fourCC code can be
4607 unsigned int avcodec_pix_fmt_to_codec_tag(enum AVPixelFormat pix_fmt);
4609 #define FF_LOSS_RESOLUTION 0x0001 /**< loss due to resolution change */
4610 #define FF_LOSS_DEPTH 0x0002 /**< loss due to color depth change */
4611 #define FF_LOSS_COLORSPACE 0x0004 /**< loss due to color space conversion */
4612 #define FF_LOSS_ALPHA 0x0008 /**< loss of alpha bits */
4613 #define FF_LOSS_COLORQUANT 0x0010 /**< loss due to color quantization */
4614 #define FF_LOSS_CHROMA 0x0020 /**< loss of chroma (e.g. RGB to gray conversion) */
4617 * Compute what kind of losses will occur when converting from one specific
4618 * pixel format to another.
4619 * When converting from one pixel format to another, information loss may occur.
4620 * For example, when converting from RGB24 to GRAY, the color information will
4621 * be lost. Similarly, other losses occur when converting from some formats to
4622 * other formats. These losses can involve loss of chroma, but also loss of
4623 * resolution, loss of color depth, loss due to the color space conversion, loss
4624 * of the alpha bits or loss due to color quantization.
4625 * avcodec_get_fix_fmt_loss() informs you about the various types of losses
4626 * which will occur when converting from one pixel format to another.
4628 * @param[in] dst_pix_fmt destination pixel format
4629 * @param[in] src_pix_fmt source pixel format
4630 * @param[in] has_alpha Whether the source pixel format alpha channel is used.
4631 * @return Combination of flags informing you what kind of losses will occur
4632 * (maximum loss for an invalid dst_pix_fmt).
4634 int avcodec_get_pix_fmt_loss(enum AVPixelFormat dst_pix_fmt, enum AVPixelFormat src_pix_fmt,
4637 #if FF_API_FIND_BEST_PIX_FMT
4639 * @deprecated use avcodec_find_best_pix_fmt_of_2() instead.
4641 * Find the best pixel format to convert to given a certain source pixel
4642 * format. When converting from one pixel format to another, information loss
4643 * may occur. For example, when converting from RGB24 to GRAY, the color
4644 * information will be lost. Similarly, other losses occur when converting from
4645 * some formats to other formats. avcodec_find_best_pix_fmt() searches which of
4646 * the given pixel formats should be used to suffer the least amount of loss.
4647 * The pixel formats from which it chooses one, are determined by the
4648 * pix_fmt_mask parameter.
4650 * Note, only the first 64 pixel formats will fit in pix_fmt_mask.
4653 * src_pix_fmt = AV_PIX_FMT_YUV420P;
4654 * pix_fmt_mask = (1 << AV_PIX_FMT_YUV422P) | (1 << AV_PIX_FMT_RGB24);
4655 * dst_pix_fmt = avcodec_find_best_pix_fmt(pix_fmt_mask, src_pix_fmt, alpha, &loss);
4658 * @param[in] pix_fmt_mask bitmask determining which pixel format to choose from
4659 * @param[in] src_pix_fmt source pixel format
4660 * @param[in] has_alpha Whether the source pixel format alpha channel is used.
4661 * @param[out] loss_ptr Combination of flags informing you what kind of losses will occur.
4662 * @return The best pixel format to convert to or -1 if none was found.
4664 attribute_deprecated
4665 enum AVPixelFormat avcodec_find_best_pix_fmt(int64_t pix_fmt_mask, enum AVPixelFormat src_pix_fmt,
4666 int has_alpha, int *loss_ptr);
4667 #endif /* FF_API_FIND_BEST_PIX_FMT */
4670 * Find the best pixel format to convert to given a certain source pixel
4671 * format. When converting from one pixel format to another, information loss
4672 * may occur. For example, when converting from RGB24 to GRAY, the color
4673 * information will be lost. Similarly, other losses occur when converting from
4674 * some formats to other formats. avcodec_find_best_pix_fmt_of_2() searches which of
4675 * the given pixel formats should be used to suffer the least amount of loss.
4676 * The pixel formats from which it chooses one, are determined by the
4677 * pix_fmt_list parameter.
4680 * @param[in] pix_fmt_list AV_PIX_FMT_NONE terminated array of pixel formats to choose from
4681 * @param[in] src_pix_fmt source pixel format
4682 * @param[in] has_alpha Whether the source pixel format alpha channel is used.
4683 * @param[out] loss_ptr Combination of flags informing you what kind of losses will occur.
4684 * @return The best pixel format to convert to or -1 if none was found.
4686 enum AVPixelFormat avcodec_find_best_pix_fmt_of_list(enum AVPixelFormat *pix_fmt_list,
4687 enum AVPixelFormat src_pix_fmt,
4688 int has_alpha, int *loss_ptr);
4691 * Find the best pixel format to convert to given a certain source pixel
4692 * format and a selection of two destination pixel formats. When converting from
4693 * one pixel format to another, information loss may occur. For example, when converting
4694 * from RGB24 to GRAY, the color information will be lost. Similarly, other losses occur when
4695 * converting from some formats to other formats. avcodec_find_best_pix_fmt_of_2() selects which of
4696 * the given pixel formats should be used to suffer the least amount of loss.
4698 * If one of the destination formats is AV_PIX_FMT_NONE the other pixel format (if valid) will be
4702 * src_pix_fmt = AV_PIX_FMT_YUV420P;
4703 * dst_pix_fmt1= AV_PIX_FMT_RGB24;
4704 * dst_pix_fmt2= AV_PIX_FMT_GRAY8;
4705 * dst_pix_fmt3= AV_PIX_FMT_RGB8;
4706 * loss= FF_LOSS_CHROMA; // don't care about chroma loss, so chroma loss will be ignored.
4707 * dst_pix_fmt = avcodec_find_best_pix_fmt_of_2(dst_pix_fmt1, dst_pix_fmt2, src_pix_fmt, alpha, &loss);
4708 * dst_pix_fmt = avcodec_find_best_pix_fmt_of_2(dst_pix_fmt, dst_pix_fmt3, src_pix_fmt, alpha, &loss);
4711 * @param[in] dst_pix_fmt1 One of the two destination pixel formats to choose from
4712 * @param[in] dst_pix_fmt2 The other of the two destination pixel formats to choose from
4713 * @param[in] src_pix_fmt Source pixel format
4714 * @param[in] has_alpha Whether the source pixel format alpha channel is used.
4715 * @param[in, out] loss_ptr Combination of loss flags. In: selects which of the losses to ignore, i.e.
4716 * NULL or value of zero means we care about all losses. Out: the loss
4717 * that occurs when converting from src to selected dst pixel format.
4718 * @return The best pixel format to convert to or -1 if none was found.
4720 enum AVPixelFormat avcodec_find_best_pix_fmt_of_2(enum AVPixelFormat dst_pix_fmt1, enum AVPixelFormat dst_pix_fmt2,
4721 enum AVPixelFormat src_pix_fmt, int has_alpha, int *loss_ptr);
4723 attribute_deprecated
4724 #if AV_HAVE_INCOMPATIBLE_FORK_ABI
4725 enum AVPixelFormat avcodec_find_best_pix_fmt2(enum AVPixelFormat *pix_fmt_list,
4726 enum AVPixelFormat src_pix_fmt,
4727 int has_alpha, int *loss_ptr);
4729 enum AVPixelFormat avcodec_find_best_pix_fmt2(enum AVPixelFormat dst_pix_fmt1, enum AVPixelFormat dst_pix_fmt2,
4730 enum AVPixelFormat src_pix_fmt, int has_alpha, int *loss_ptr);
4734 enum AVPixelFormat avcodec_default_get_format(struct AVCodecContext *s, const enum AVPixelFormat * fmt);
4740 void avcodec_set_dimensions(AVCodecContext *s, int width, int height);
4743 * Put a string representing the codec tag codec_tag in buf.
4745 * @param buf_size size in bytes of buf
4746 * @return the length of the string that would have been generated if
4747 * enough space had been available, excluding the trailing null
4749 size_t av_get_codec_tag_string(char *buf, size_t buf_size, unsigned int codec_tag);
4751 void avcodec_string(char *buf, int buf_size, AVCodecContext *enc, int encode);
4754 * Return a name for the specified profile, if available.
4756 * @param codec the codec that is searched for the given profile
4757 * @param profile the profile value for which a name is requested
4758 * @return A name for the profile if found, NULL otherwise.
4760 const char *av_get_profile_name(const AVCodec *codec, int profile);
4762 int avcodec_default_execute(AVCodecContext *c, int (*func)(AVCodecContext *c2, void *arg2),void *arg, int *ret, int count, int size);
4763 int avcodec_default_execute2(AVCodecContext *c, int (*func)(AVCodecContext *c2, void *arg2, int, int),void *arg, int *ret, int count);
4764 //FIXME func typedef
4767 * Fill audio frame data and linesize.
4768 * AVFrame extended_data channel pointers are allocated if necessary for
4771 * @param frame the AVFrame
4772 * frame->nb_samples must be set prior to calling the
4773 * function. This function fills in frame->data,
4774 * frame->extended_data, frame->linesize[0].
4775 * @param nb_channels channel count
4776 * @param sample_fmt sample format
4777 * @param buf buffer to use for frame data
4778 * @param buf_size size of buffer
4779 * @param align plane size sample alignment (0 = default)
4780 * @return 0 on success, negative error code on failure
4782 int avcodec_fill_audio_frame(AVFrame *frame, int nb_channels,
4783 enum AVSampleFormat sample_fmt, const uint8_t *buf,
4784 int buf_size, int align);
4787 * Flush buffers, should be called when seeking or when switching to a different stream.
4789 void avcodec_flush_buffers(AVCodecContext *avctx);
4791 void avcodec_default_free_buffers(AVCodecContext *s);
4794 * Return codec bits per sample.
4796 * @param[in] codec_id the codec
4797 * @return Number of bits per sample or zero if unknown for the given codec.
4799 int av_get_bits_per_sample(enum AVCodecID codec_id);
4802 * Return the PCM codec associated with a sample format.
4803 * @param be endianness, 0 for little, 1 for big,
4804 * -1 (or anything else) for native
4805 * @return AV_CODEC_ID_PCM_* or AV_CODEC_ID_NONE
4807 enum AVCodecID av_get_pcm_codec(enum AVSampleFormat fmt, int be);
4810 * Return codec bits per sample.
4811 * Only return non-zero if the bits per sample is exactly correct, not an
4814 * @param[in] codec_id the codec
4815 * @return Number of bits per sample or zero if unknown for the given codec.
4817 int av_get_exact_bits_per_sample(enum AVCodecID codec_id);
4820 * Return audio frame duration.
4822 * @param avctx codec context
4823 * @param frame_bytes size of the frame, or 0 if unknown
4824 * @return frame duration, in samples, if known. 0 if not able to
4827 int av_get_audio_frame_duration(AVCodecContext *avctx, int frame_bytes);
4830 typedef struct AVBitStreamFilterContext {
4832 struct AVBitStreamFilter *filter;
4833 AVCodecParserContext *parser;
4834 struct AVBitStreamFilterContext *next;
4835 } AVBitStreamFilterContext;
4838 typedef struct AVBitStreamFilter {
4841 int (*filter)(AVBitStreamFilterContext *bsfc,
4842 AVCodecContext *avctx, const char *args,
4843 uint8_t **poutbuf, int *poutbuf_size,
4844 const uint8_t *buf, int buf_size, int keyframe);
4845 void (*close)(AVBitStreamFilterContext *bsfc);
4846 struct AVBitStreamFilter *next;
4847 } AVBitStreamFilter;
4849 void av_register_bitstream_filter(AVBitStreamFilter *bsf);
4850 AVBitStreamFilterContext *av_bitstream_filter_init(const char *name);
4851 int av_bitstream_filter_filter(AVBitStreamFilterContext *bsfc,
4852 AVCodecContext *avctx, const char *args,
4853 uint8_t **poutbuf, int *poutbuf_size,
4854 const uint8_t *buf, int buf_size, int keyframe);
4855 void av_bitstream_filter_close(AVBitStreamFilterContext *bsf);
4857 AVBitStreamFilter *av_bitstream_filter_next(AVBitStreamFilter *f);
4862 * Reallocate the given block if it is not large enough, otherwise do nothing.
4866 void *av_fast_realloc(void *ptr, unsigned int *size, size_t min_size);
4869 * Allocate a buffer, reusing the given one if large enough.
4871 * Contrary to av_fast_realloc the current buffer contents might not be
4872 * preserved and on error the old buffer is freed, thus no special
4873 * handling to avoid memleaks is necessary.
4875 * @param ptr pointer to pointer to already allocated buffer, overwritten with pointer to new buffer
4876 * @param size size of the buffer *ptr points to
4877 * @param min_size minimum size of *ptr buffer after returning, *ptr will be NULL and
4878 * *size 0 if an error occurred.
4880 void av_fast_malloc(void *ptr, unsigned int *size, size_t min_size);
4883 * Same behaviour av_fast_malloc but the buffer has additional
4884 * FF_INPUT_PADDING_SIZE at the end which will will always be 0.
4886 * In addition the whole buffer will initially and after resizes
4887 * be 0-initialized so that no uninitialized data will ever appear.
4889 void av_fast_padded_malloc(void *ptr, unsigned int *size, size_t min_size);
4892 * Same behaviour av_fast_padded_malloc except that buffer will always
4893 * be 0-initialized after call.
4895 void av_fast_padded_mallocz(void *ptr, unsigned int *size, size_t min_size);
4898 * Encode extradata length to a buffer. Used by xiph codecs.
4900 * @param s buffer to write to; must be at least (v/255+1) bytes long
4901 * @param v size of extradata in bytes
4902 * @return number of bytes written to the buffer.
4904 unsigned int av_xiphlacing(unsigned char *s, unsigned int v);
4907 * Log a generic warning message about a missing feature. This function is
4908 * intended to be used internally by FFmpeg (libavcodec, libavformat, etc.)
4909 * only, and would normally not be used by applications.
4910 * @param[in] avc a pointer to an arbitrary struct of which the first field is
4911 * a pointer to an AVClass struct
4912 * @param[in] feature string containing the name of the missing feature
4913 * @param[in] want_sample indicates if samples are wanted which exhibit this feature.
4914 * If want_sample is non-zero, additional verbage will be added to the log
4915 * message which tells the user how to report samples to the development
4918 void av_log_missing_feature(void *avc, const char *feature, int want_sample);
4921 * Log a generic warning message asking for a sample. This function is
4922 * intended to be used internally by FFmpeg (libavcodec, libavformat, etc.)
4923 * only, and would normally not be used by applications.
4924 * @param[in] avc a pointer to an arbitrary struct of which the first field is
4925 * a pointer to an AVClass struct
4926 * @param[in] msg string containing an optional message, or NULL if no message
4928 void av_log_ask_for_sample(void *avc, const char *msg, ...) av_printf_format(2, 3);
4931 * Register the hardware accelerator hwaccel.
4933 void av_register_hwaccel(AVHWAccel *hwaccel);
4936 * If hwaccel is NULL, returns the first registered hardware accelerator,
4937 * if hwaccel is non-NULL, returns the next registered hardware accelerator
4938 * after hwaccel, or NULL if hwaccel is the last one.
4940 AVHWAccel *av_hwaccel_next(AVHWAccel *hwaccel);
4944 * Lock operation used by lockmgr
4947 AV_LOCK_CREATE, ///< Create a mutex
4948 AV_LOCK_OBTAIN, ///< Lock the mutex
4949 AV_LOCK_RELEASE, ///< Unlock the mutex
4950 AV_LOCK_DESTROY, ///< Free mutex resources
4954 * Register a user provided lock manager supporting the operations
4955 * specified by AVLockOp. mutex points to a (void *) where the
4956 * lockmgr should store/get a pointer to a user allocated mutex. It's
4957 * NULL upon AV_LOCK_CREATE and != NULL for all other ops.
4959 * @param cb User defined callback. Note: FFmpeg may invoke calls to this
4960 * callback during the call to av_lockmgr_register().
4961 * Thus, the application must be prepared to handle that.
4962 * If cb is set to NULL the lockmgr will be unregistered.
4963 * Also note that during unregistration the previously registered
4964 * lockmgr callback may also be invoked.
4966 int av_lockmgr_register(int (*cb)(void **mutex, enum AVLockOp op));
4969 * Get the type of the given codec.
4971 enum AVMediaType avcodec_get_type(enum AVCodecID codec_id);
4974 * Get the name of a codec.
4975 * @return a static string identifying the codec; never NULL
4977 const char *avcodec_get_name(enum AVCodecID id);
4980 * @return a positive value if s is open (i.e. avcodec_open2() was called on it
4981 * with no corresponding avcodec_close()), 0 otherwise.
4983 int avcodec_is_open(AVCodecContext *s);
4986 * @return a non-zero number if codec is an encoder, zero otherwise
4988 int av_codec_is_encoder(const AVCodec *codec);
4991 * @return a non-zero number if codec is a decoder, zero otherwise
4993 int av_codec_is_decoder(const AVCodec *codec);
4996 * @return descriptor for given codec ID or NULL if no descriptor exists.
4998 const AVCodecDescriptor *avcodec_descriptor_get(enum AVCodecID id);
5001 * Iterate over all codec descriptors known to libavcodec.
5003 * @param prev previous descriptor. NULL to get the first descriptor.
5005 * @return next descriptor or NULL after the last descriptor
5007 const AVCodecDescriptor *avcodec_descriptor_next(const AVCodecDescriptor *prev);
5010 * @return codec descriptor with the given name or NULL if no such descriptor
5013 const AVCodecDescriptor *avcodec_descriptor_get_by_name(const char *name);
5019 #endif /* AVCODEC_AVCODEC_H */