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,
271 AV_CODEC_ID_BRENDER_PIX= MKBETAG('B','P','I','X'),
272 AV_CODEC_ID_Y41P = MKBETAG('Y','4','1','P'),
273 AV_CODEC_ID_ESCAPE130 = MKBETAG('E','1','3','0'),
274 AV_CODEC_ID_EXR = MKBETAG('0','E','X','R'),
275 AV_CODEC_ID_AVRP = MKBETAG('A','V','R','P'),
277 AV_CODEC_ID_012V = MKBETAG('0','1','2','V'),
278 AV_CODEC_ID_G2M = MKBETAG( 0 ,'G','2','M'),
279 AV_CODEC_ID_AVUI = MKBETAG('A','V','U','I'),
280 AV_CODEC_ID_AYUV = MKBETAG('A','Y','U','V'),
281 AV_CODEC_ID_TARGA_Y216 = MKBETAG('T','2','1','6'),
282 AV_CODEC_ID_V308 = MKBETAG('V','3','0','8'),
283 AV_CODEC_ID_V408 = MKBETAG('V','4','0','8'),
284 AV_CODEC_ID_YUV4 = MKBETAG('Y','U','V','4'),
285 AV_CODEC_ID_SANM = MKBETAG('S','A','N','M'),
286 AV_CODEC_ID_PAF_VIDEO = MKBETAG('P','A','F','V'),
287 AV_CODEC_ID_AVRN = MKBETAG('A','V','R','n'),
288 AV_CODEC_ID_CPIA = MKBETAG('C','P','I','A'),
289 AV_CODEC_ID_XFACE = MKBETAG('X','F','A','C'),
290 AV_CODEC_ID_SGIRLE = MKBETAG('S','G','I','R'),
291 AV_CODEC_ID_MVC1 = MKBETAG('M','V','C','1'),
292 AV_CODEC_ID_MVC2 = MKBETAG('M','V','C','2'),
294 /* various PCM "codecs" */
295 AV_CODEC_ID_FIRST_AUDIO = 0x10000, ///< A dummy id pointing at the start of audio codecs
296 AV_CODEC_ID_PCM_S16LE = 0x10000,
297 AV_CODEC_ID_PCM_S16BE,
298 AV_CODEC_ID_PCM_U16LE,
299 AV_CODEC_ID_PCM_U16BE,
302 AV_CODEC_ID_PCM_MULAW,
303 AV_CODEC_ID_PCM_ALAW,
304 AV_CODEC_ID_PCM_S32LE,
305 AV_CODEC_ID_PCM_S32BE,
306 AV_CODEC_ID_PCM_U32LE,
307 AV_CODEC_ID_PCM_U32BE,
308 AV_CODEC_ID_PCM_S24LE,
309 AV_CODEC_ID_PCM_S24BE,
310 AV_CODEC_ID_PCM_U24LE,
311 AV_CODEC_ID_PCM_U24BE,
312 AV_CODEC_ID_PCM_S24DAUD,
313 AV_CODEC_ID_PCM_ZORK,
314 AV_CODEC_ID_PCM_S16LE_PLANAR,
316 AV_CODEC_ID_PCM_F32BE,
317 AV_CODEC_ID_PCM_F32LE,
318 AV_CODEC_ID_PCM_F64BE,
319 AV_CODEC_ID_PCM_F64LE,
320 AV_CODEC_ID_PCM_BLURAY,
323 AV_CODEC_ID_PCM_S8_PLANAR,
324 AV_CODEC_ID_PCM_S24LE_PLANAR = MKBETAG(24,'P','S','P'),
325 AV_CODEC_ID_PCM_S32LE_PLANAR = MKBETAG(32,'P','S','P'),
326 AV_CODEC_ID_PCM_S16BE_PLANAR = MKBETAG('P','S','P',16),
328 /* various ADPCM codecs */
329 AV_CODEC_ID_ADPCM_IMA_QT = 0x11000,
330 AV_CODEC_ID_ADPCM_IMA_WAV,
331 AV_CODEC_ID_ADPCM_IMA_DK3,
332 AV_CODEC_ID_ADPCM_IMA_DK4,
333 AV_CODEC_ID_ADPCM_IMA_WS,
334 AV_CODEC_ID_ADPCM_IMA_SMJPEG,
335 AV_CODEC_ID_ADPCM_MS,
336 AV_CODEC_ID_ADPCM_4XM,
337 AV_CODEC_ID_ADPCM_XA,
338 AV_CODEC_ID_ADPCM_ADX,
339 AV_CODEC_ID_ADPCM_EA,
340 AV_CODEC_ID_ADPCM_G726,
341 AV_CODEC_ID_ADPCM_CT,
342 AV_CODEC_ID_ADPCM_SWF,
343 AV_CODEC_ID_ADPCM_YAMAHA,
344 AV_CODEC_ID_ADPCM_SBPRO_4,
345 AV_CODEC_ID_ADPCM_SBPRO_3,
346 AV_CODEC_ID_ADPCM_SBPRO_2,
347 AV_CODEC_ID_ADPCM_THP,
348 AV_CODEC_ID_ADPCM_IMA_AMV,
349 AV_CODEC_ID_ADPCM_EA_R1,
350 AV_CODEC_ID_ADPCM_EA_R3,
351 AV_CODEC_ID_ADPCM_EA_R2,
352 AV_CODEC_ID_ADPCM_IMA_EA_SEAD,
353 AV_CODEC_ID_ADPCM_IMA_EA_EACS,
354 AV_CODEC_ID_ADPCM_EA_XAS,
355 AV_CODEC_ID_ADPCM_EA_MAXIS_XA,
356 AV_CODEC_ID_ADPCM_IMA_ISS,
357 AV_CODEC_ID_ADPCM_G722,
358 AV_CODEC_ID_ADPCM_IMA_APC,
359 AV_CODEC_ID_VIMA = MKBETAG('V','I','M','A'),
360 AV_CODEC_ID_ADPCM_AFC = MKBETAG('A','F','C',' '),
361 AV_CODEC_ID_ADPCM_IMA_OKI = MKBETAG('O','K','I',' '),
364 AV_CODEC_ID_AMR_NB = 0x12000,
367 /* RealAudio codecs*/
368 AV_CODEC_ID_RA_144 = 0x13000,
371 /* various DPCM codecs */
372 AV_CODEC_ID_ROQ_DPCM = 0x14000,
373 AV_CODEC_ID_INTERPLAY_DPCM,
374 AV_CODEC_ID_XAN_DPCM,
375 AV_CODEC_ID_SOL_DPCM,
378 AV_CODEC_ID_MP2 = 0x15000,
379 AV_CODEC_ID_MP3, ///< preferred ID for decoding MPEG audio layer 1, 2 or 3
389 AV_CODEC_ID_VMDAUDIO,
395 AV_CODEC_ID_WESTWOOD_SND1,
396 AV_CODEC_ID_GSM, ///< as in Berlin toast format
399 AV_CODEC_ID_TRUESPEECH,
401 AV_CODEC_ID_SMACKAUDIO,
404 AV_CODEC_ID_DSICINAUDIO,
406 AV_CODEC_ID_MUSEPACK7,
408 AV_CODEC_ID_GSM_MS, /* as found in WAV */
412 AV_CODEC_ID_NELLYMOSER,
413 AV_CODEC_ID_MUSEPACK8,
415 AV_CODEC_ID_WMAVOICE,
417 AV_CODEC_ID_WMALOSSLESS,
426 AV_CODEC_ID_BINKAUDIO_RDFT,
427 AV_CODEC_ID_BINKAUDIO_DCT,
428 AV_CODEC_ID_AAC_LATM,
433 AV_CODEC_ID_8SVX_EXP,
434 AV_CODEC_ID_8SVX_FIB,
435 AV_CODEC_ID_BMV_AUDIO,
439 AV_CODEC_ID_OPUS_DEPRECATED,
440 AV_CODEC_ID_COMFORT_NOISE,
441 AV_CODEC_ID_TAK_DEPRECATED,
442 AV_CODEC_ID_FFWAVESYNTH = MKBETAG('F','F','W','S'),
443 #if LIBAVCODEC_VERSION_MAJOR <= 54
444 AV_CODEC_ID_8SVX_RAW = MKBETAG('8','S','V','X'),
446 AV_CODEC_ID_SONIC = MKBETAG('S','O','N','C'),
447 AV_CODEC_ID_SONIC_LS = MKBETAG('S','O','N','L'),
448 AV_CODEC_ID_PAF_AUDIO = MKBETAG('P','A','F','A'),
449 AV_CODEC_ID_OPUS = MKBETAG('O','P','U','S'),
450 AV_CODEC_ID_TAK = MKBETAG('t','B','a','K'),
451 AV_CODEC_ID_EVRC = MKBETAG('s','e','v','c'),
452 AV_CODEC_ID_SMV = MKBETAG('s','s','m','v'),
454 /* subtitle codecs */
455 AV_CODEC_ID_FIRST_SUBTITLE = 0x17000, ///< A dummy ID pointing at the start of subtitle codecs.
456 AV_CODEC_ID_DVD_SUBTITLE = 0x17000,
457 AV_CODEC_ID_DVB_SUBTITLE,
458 AV_CODEC_ID_TEXT, ///< raw UTF-8 text
461 AV_CODEC_ID_MOV_TEXT,
462 AV_CODEC_ID_HDMV_PGS_SUBTITLE,
463 AV_CODEC_ID_DVB_TELETEXT,
465 AV_CODEC_ID_MICRODVD = MKBETAG('m','D','V','D'),
466 AV_CODEC_ID_EIA_608 = MKBETAG('c','6','0','8'),
467 AV_CODEC_ID_JACOSUB = MKBETAG('J','S','U','B'),
468 AV_CODEC_ID_SAMI = MKBETAG('S','A','M','I'),
469 AV_CODEC_ID_REALTEXT = MKBETAG('R','T','X','T'),
470 AV_CODEC_ID_SUBVIEWER1 = MKBETAG('S','b','V','1'),
471 AV_CODEC_ID_SUBVIEWER = MKBETAG('S','u','b','V'),
472 AV_CODEC_ID_SUBRIP = MKBETAG('S','R','i','p'),
473 AV_CODEC_ID_WEBVTT = MKBETAG('W','V','T','T'),
474 AV_CODEC_ID_MPL2 = MKBETAG('M','P','L','2'),
475 AV_CODEC_ID_VPLAYER = MKBETAG('V','P','l','r'),
476 AV_CODEC_ID_PJS = MKBETAG('P','h','J','S'),
478 /* other specific kind of codecs (generally used for attachments) */
479 AV_CODEC_ID_FIRST_UNKNOWN = 0x18000, ///< A dummy ID pointing at the start of various fake codecs.
480 AV_CODEC_ID_TTF = 0x18000,
481 AV_CODEC_ID_BINTEXT = MKBETAG('B','T','X','T'),
482 AV_CODEC_ID_XBIN = MKBETAG('X','B','I','N'),
483 AV_CODEC_ID_IDF = MKBETAG( 0 ,'I','D','F'),
484 AV_CODEC_ID_OTF = MKBETAG( 0 ,'O','T','F'),
485 AV_CODEC_ID_SMPTE_KLV = MKBETAG('K','L','V','A'),
487 AV_CODEC_ID_PROBE = 0x19000, ///< codec_id is not known (like AV_CODEC_ID_NONE) but lavf should attempt to identify it
489 AV_CODEC_ID_MPEG2TS = 0x20000, /**< _FAKE_ codec to indicate a raw MPEG-2 TS
490 * stream (only used by libavformat) */
491 AV_CODEC_ID_MPEG4SYSTEMS = 0x20001, /**< _FAKE_ codec to indicate a MPEG-4 Systems
492 * stream (only used by libavformat) */
493 AV_CODEC_ID_FFMETADATA = 0x21000, ///< Dummy codec for streams containing only metadata information.
496 #include "old_codec_ids.h"
501 #define CodecID AVCodecID
505 * This struct describes the properties of a single codec described by an
507 * @see avcodec_get_descriptor()
509 typedef struct AVCodecDescriptor {
511 enum AVMediaType type;
513 * Name of the codec described by this descriptor. It is non-empty and
514 * unique for each codec descriptor. It should contain alphanumeric
515 * characters and '_' only.
519 * A more descriptive name for this codec. May be NULL.
521 const char *long_name;
523 * Codec properties, a combination of AV_CODEC_PROP_* flags.
529 * Codec uses only intra compression.
532 #define AV_CODEC_PROP_INTRA_ONLY (1 << 0)
534 * Codec supports lossy compression. Audio and video codecs only.
535 * @note a codec may support both lossy and lossless
538 #define AV_CODEC_PROP_LOSSY (1 << 1)
540 * Codec supports lossless compression. Audio and video codecs only.
542 #define AV_CODEC_PROP_LOSSLESS (1 << 2)
544 #if FF_API_OLD_DECODE_AUDIO
546 #define AVCODEC_MAX_AUDIO_FRAME_SIZE 192000 // 1 second of 48khz 32bit audio
550 * @ingroup lavc_decoding
551 * Required number of additionally allocated bytes at the end of the input bitstream for decoding.
552 * This is mainly needed because some optimized bitstream readers read
553 * 32 or 64 bit at once and could read over the end.<br>
554 * Note: If the first 23 bits of the additional bytes are not 0, then damaged
555 * MPEG bitstreams could cause overread and segfault.
557 #define FF_INPUT_BUFFER_PADDING_SIZE 16
560 * @ingroup lavc_encoding
561 * minimum encoding buffer size
562 * Used to avoid some checks during header writing.
564 #define FF_MIN_BUFFER_SIZE 16384
568 * @ingroup lavc_encoding
569 * motion estimation type.
572 ME_ZERO = 1, ///< no search, that is use 0,0 vector whenever one is needed
576 ME_EPZS, ///< enhanced predictive zonal search
577 ME_X1, ///< reserved for experiments
578 ME_HEX, ///< hexagon based search
579 ME_UMH, ///< uneven multi-hexagon search
580 ME_ITER, ///< iterative search
581 ME_TESA, ///< transformed exhaustive search algorithm
585 * @ingroup lavc_decoding
588 /* We leave some space between them for extensions (drop some
589 * keyframes for intra-only or drop just some bidir frames). */
590 AVDISCARD_NONE =-16, ///< discard nothing
591 AVDISCARD_DEFAULT = 0, ///< discard useless packets like 0 size packets in avi
592 AVDISCARD_NONREF = 8, ///< discard all non reference
593 AVDISCARD_BIDIR = 16, ///< discard all bidirectional frames
594 AVDISCARD_NONKEY = 32, ///< discard all frames except keyframes
595 AVDISCARD_ALL = 48, ///< discard all
598 enum AVColorPrimaries{
599 AVCOL_PRI_BT709 = 1, ///< also ITU-R BT1361 / IEC 61966-2-4 / SMPTE RP177 Annex B
600 AVCOL_PRI_UNSPECIFIED = 2,
601 AVCOL_PRI_BT470M = 4,
602 AVCOL_PRI_BT470BG = 5, ///< also ITU-R BT601-6 625 / ITU-R BT1358 625 / ITU-R BT1700 625 PAL & SECAM
603 AVCOL_PRI_SMPTE170M = 6, ///< also ITU-R BT601-6 525 / ITU-R BT1358 525 / ITU-R BT1700 NTSC
604 AVCOL_PRI_SMPTE240M = 7, ///< functionally identical to above
606 AVCOL_PRI_NB , ///< Not part of ABI
609 enum AVColorTransferCharacteristic{
610 AVCOL_TRC_BT709 = 1, ///< also ITU-R BT1361
611 AVCOL_TRC_UNSPECIFIED = 2,
612 AVCOL_TRC_GAMMA22 = 4, ///< also ITU-R BT470M / ITU-R BT1700 625 PAL & SECAM
613 AVCOL_TRC_GAMMA28 = 5, ///< also ITU-R BT470BG
614 AVCOL_TRC_SMPTE240M = 7,
615 AVCOL_TRC_NB , ///< Not part of ABI
620 AVCOL_SPC_BT709 = 1, ///< also ITU-R BT1361 / IEC 61966-2-4 xvYCC709 / SMPTE RP177 Annex B
621 AVCOL_SPC_UNSPECIFIED = 2,
623 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
624 AVCOL_SPC_SMPTE170M = 6, ///< also ITU-R BT601-6 525 / ITU-R BT1358 525 / ITU-R BT1700 NTSC / functionally identical to above
625 AVCOL_SPC_SMPTE240M = 7,
626 AVCOL_SPC_YCOCG = 8, ///< Used by Dirac / VC-2 and H.264 FRext, see ITU-T SG16
627 AVCOL_SPC_NB , ///< Not part of ABI
629 #define AVCOL_SPC_YCGCO AVCOL_SPC_YCOCG
632 AVCOL_RANGE_UNSPECIFIED = 0,
633 AVCOL_RANGE_MPEG = 1, ///< the normal 219*2^(n-8) "MPEG" YUV ranges
634 AVCOL_RANGE_JPEG = 2, ///< the normal 2^n-1 "JPEG" YUV ranges
635 AVCOL_RANGE_NB , ///< Not part of ABI
639 * X X 3 4 X X are luma samples,
640 * 1 2 1-6 are possible chroma positions
641 * X X 5 6 X 0 is undefined/unknown position
643 enum AVChromaLocation{
644 AVCHROMA_LOC_UNSPECIFIED = 0,
645 AVCHROMA_LOC_LEFT = 1, ///< mpeg2/4, h264 default
646 AVCHROMA_LOC_CENTER = 2, ///< mpeg1, jpeg, h263
647 AVCHROMA_LOC_TOPLEFT = 3, ///< DV
648 AVCHROMA_LOC_TOP = 4,
649 AVCHROMA_LOC_BOTTOMLEFT = 5,
650 AVCHROMA_LOC_BOTTOM = 6,
651 AVCHROMA_LOC_NB , ///< Not part of ABI
654 enum AVAudioServiceType {
655 AV_AUDIO_SERVICE_TYPE_MAIN = 0,
656 AV_AUDIO_SERVICE_TYPE_EFFECTS = 1,
657 AV_AUDIO_SERVICE_TYPE_VISUALLY_IMPAIRED = 2,
658 AV_AUDIO_SERVICE_TYPE_HEARING_IMPAIRED = 3,
659 AV_AUDIO_SERVICE_TYPE_DIALOGUE = 4,
660 AV_AUDIO_SERVICE_TYPE_COMMENTARY = 5,
661 AV_AUDIO_SERVICE_TYPE_EMERGENCY = 6,
662 AV_AUDIO_SERVICE_TYPE_VOICE_OVER = 7,
663 AV_AUDIO_SERVICE_TYPE_KARAOKE = 8,
664 AV_AUDIO_SERVICE_TYPE_NB , ///< Not part of ABI
668 * @ingroup lavc_encoding
670 typedef struct RcOverride{
673 int qscale; // If this is 0 then quality_factor will be used instead.
674 float quality_factor;
677 #define FF_MAX_B_FRAMES 16
680 These flags can be passed in AVCodecContext.flags before initialization.
681 Note: Not everything is supported yet.
684 #define CODEC_FLAG_QSCALE 0x0002 ///< Use fixed qscale.
685 #define CODEC_FLAG_4MV 0x0004 ///< 4 MV per MB allowed / advanced prediction for H.263.
686 #define CODEC_FLAG_QPEL 0x0010 ///< Use qpel MC.
687 #define CODEC_FLAG_GMC 0x0020 ///< Use GMC.
688 #define CODEC_FLAG_MV0 0x0040 ///< Always try a MB with MV=<0,0>.
690 * The parent program guarantees that the input for B-frames containing
691 * streams is not written to for at least s->max_b_frames+1 frames, if
692 * this is not set the input will be copied.
694 #define CODEC_FLAG_INPUT_PRESERVED 0x0100
695 #define CODEC_FLAG_PASS1 0x0200 ///< Use internal 2pass ratecontrol in first pass mode.
696 #define CODEC_FLAG_PASS2 0x0400 ///< Use internal 2pass ratecontrol in second pass mode.
697 #define CODEC_FLAG_GRAY 0x2000 ///< Only decode/encode grayscale.
698 #define CODEC_FLAG_EMU_EDGE 0x4000 ///< Don't draw edges.
699 #define CODEC_FLAG_PSNR 0x8000 ///< error[?] variables will be set during encoding.
700 #define CODEC_FLAG_TRUNCATED 0x00010000 /** Input bitstream might be truncated at a random
701 location instead of only at frame boundaries. */
702 #define CODEC_FLAG_NORMALIZE_AQP 0x00020000 ///< Normalize adaptive quantization.
703 #define CODEC_FLAG_INTERLACED_DCT 0x00040000 ///< Use interlaced DCT.
704 #define CODEC_FLAG_LOW_DELAY 0x00080000 ///< Force low delay.
705 #define CODEC_FLAG_GLOBAL_HEADER 0x00400000 ///< Place global headers in extradata instead of every keyframe.
706 #define CODEC_FLAG_BITEXACT 0x00800000 ///< Use only bitexact stuff (except (I)DCT).
707 /* Fx : Flag for h263+ extra options */
708 #define CODEC_FLAG_AC_PRED 0x01000000 ///< H.263 advanced intra coding / MPEG-4 AC prediction
709 #define CODEC_FLAG_LOOP_FILTER 0x00000800 ///< loop filter
710 #define CODEC_FLAG_INTERLACED_ME 0x20000000 ///< interlaced motion estimation
711 #define CODEC_FLAG_CLOSED_GOP 0x80000000
712 #define CODEC_FLAG2_FAST 0x00000001 ///< Allow non spec compliant speedup tricks.
713 #define CODEC_FLAG2_NO_OUTPUT 0x00000004 ///< Skip bitstream encoding.
714 #define CODEC_FLAG2_LOCAL_HEADER 0x00000008 ///< Place global headers at every keyframe instead of in extradata.
715 #define CODEC_FLAG2_DROP_FRAME_TIMECODE 0x00002000 ///< timecode is in drop frame format. DEPRECATED!!!!
716 #if FF_API_MPV_GLOBAL_OPTS
717 #define CODEC_FLAG_CBP_RD 0x04000000 ///< Use rate distortion optimization for cbp.
718 #define CODEC_FLAG_QP_RD 0x08000000 ///< Use rate distortion optimization for qp selectioon.
719 #define CODEC_FLAG2_STRICT_GOP 0x00000002 ///< Strictly enforce GOP size.
720 #define CODEC_FLAG2_SKIP_RD 0x00004000 ///< RD optimal MB level residual skipping
722 #define CODEC_FLAG2_CHUNKS 0x00008000 ///< Input bitstream might be truncated at a packet boundaries instead of only at frame boundaries.
723 #define CODEC_FLAG2_SHOW_ALL 0x00400000 ///< Show all frames before the first keyframe
725 /* Unsupported options :
726 * Syntax Arithmetic coding (SAC)
727 * Reference Picture Selection
728 * Independent Segment Decoding */
730 /* codec capabilities */
732 #define CODEC_CAP_DRAW_HORIZ_BAND 0x0001 ///< Decoder can use draw_horiz_band callback.
734 * Codec uses get_buffer() for allocating buffers and supports custom allocators.
735 * If not set, it might not use get_buffer() at all or use operations that
736 * assume the buffer was allocated by avcodec_default_get_buffer.
738 #define CODEC_CAP_DR1 0x0002
739 #define CODEC_CAP_TRUNCATED 0x0008
740 /* Codec can export data for HW decoding (XvMC). */
741 #define CODEC_CAP_HWACCEL 0x0010
743 * Encoder or decoder requires flushing with NULL input at the end in order to
744 * give the complete and correct output.
746 * NOTE: If this flag is not set, the codec is guaranteed to never be fed with
747 * with NULL data. The user can still send NULL data to the public encode
748 * or decode function, but libavcodec will not pass it along to the codec
749 * unless this flag is set.
752 * The decoder has a non-zero delay and needs to be fed with avpkt->data=NULL,
753 * avpkt->size=0 at the end to get the delayed data until the decoder no longer
757 * The encoder needs to be fed with NULL data at the end of encoding until the
758 * encoder no longer returns data.
760 * NOTE: For encoders implementing the AVCodec.encode2() function, setting this
761 * flag also means that the encoder must set the pts and duration for
762 * each output packet. If this flag is not set, the pts and duration will
763 * be determined by libavcodec from the input frame.
765 #define CODEC_CAP_DELAY 0x0020
767 * Codec can be fed a final frame with a smaller size.
768 * This can be used to prevent truncation of the last audio samples.
770 #define CODEC_CAP_SMALL_LAST_FRAME 0x0040
772 * Codec can export data for HW decoding (VDPAU).
774 #define CODEC_CAP_HWACCEL_VDPAU 0x0080
776 * Codec can output multiple frames per AVPacket
777 * Normally demuxers return one frame at a time, demuxers which do not do
778 * are connected to a parser to split what they return into proper frames.
779 * This flag is reserved to the very rare category of codecs which have a
780 * bitstream that cannot be split into frames without timeconsuming
781 * operations like full decoding. Demuxers carring such bitstreams thus
782 * may return multiple frames in a packet. This has many disadvantages like
783 * prohibiting stream copy in many cases thus it should only be considered
786 #define CODEC_CAP_SUBFRAMES 0x0100
788 * Codec is experimental and is thus avoided in favor of non experimental
791 #define CODEC_CAP_EXPERIMENTAL 0x0200
793 * Codec should fill in channel configuration and samplerate instead of container
795 #define CODEC_CAP_CHANNEL_CONF 0x0400
798 * Codec is able to deal with negative linesizes
800 #define CODEC_CAP_NEG_LINESIZES 0x0800
803 * Codec supports frame-level multithreading.
805 #define CODEC_CAP_FRAME_THREADS 0x1000
807 * Codec supports slice-based (or partition-based) multithreading.
809 #define CODEC_CAP_SLICE_THREADS 0x2000
811 * Codec supports changed parameters at any point.
813 #define CODEC_CAP_PARAM_CHANGE 0x4000
815 * Codec supports avctx->thread_count == 0 (auto).
817 #define CODEC_CAP_AUTO_THREADS 0x8000
819 * Audio encoder supports receiving a different number of samples in each call.
821 #define CODEC_CAP_VARIABLE_FRAME_SIZE 0x10000
823 * Codec is intra only.
825 #define CODEC_CAP_INTRA_ONLY 0x40000000
829 #define CODEC_CAP_LOSSLESS 0x80000000
831 //The following defines may change, don't expect compatibility if you use them.
832 #define MB_TYPE_INTRA4x4 0x0001
833 #define MB_TYPE_INTRA16x16 0x0002 //FIXME H.264-specific
834 #define MB_TYPE_INTRA_PCM 0x0004 //FIXME H.264-specific
835 #define MB_TYPE_16x16 0x0008
836 #define MB_TYPE_16x8 0x0010
837 #define MB_TYPE_8x16 0x0020
838 #define MB_TYPE_8x8 0x0040
839 #define MB_TYPE_INTERLACED 0x0080
840 #define MB_TYPE_DIRECT2 0x0100 //FIXME
841 #define MB_TYPE_ACPRED 0x0200
842 #define MB_TYPE_GMC 0x0400
843 #define MB_TYPE_SKIP 0x0800
844 #define MB_TYPE_P0L0 0x1000
845 #define MB_TYPE_P1L0 0x2000
846 #define MB_TYPE_P0L1 0x4000
847 #define MB_TYPE_P1L1 0x8000
848 #define MB_TYPE_L0 (MB_TYPE_P0L0 | MB_TYPE_P1L0)
849 #define MB_TYPE_L1 (MB_TYPE_P0L1 | MB_TYPE_P1L1)
850 #define MB_TYPE_L0L1 (MB_TYPE_L0 | MB_TYPE_L1)
851 #define MB_TYPE_QUANT 0x00010000
852 #define MB_TYPE_CBP 0x00020000
853 //Note bits 24-31 are reserved for codec specific use (h264 ref0, mpeg1 0mv, ...)
857 * This specifies the area which should be displayed.
858 * Note there may be multiple such areas for one frame.
860 typedef struct AVPanScan{
863 * - encoding: Set by user.
864 * - decoding: Set by libavcodec.
869 * width and height in 1/16 pel
870 * - encoding: Set by user.
871 * - decoding: Set by libavcodec.
877 * position of the top left corner in 1/16 pel for up to 3 fields/frames
878 * - encoding: Set by user.
879 * - decoding: Set by libavcodec.
881 int16_t position[3][2];
884 #define FF_QSCALE_TYPE_MPEG1 0
885 #define FF_QSCALE_TYPE_MPEG2 1
886 #define FF_QSCALE_TYPE_H264 2
887 #define FF_QSCALE_TYPE_VP56 3
889 #define FF_BUFFER_TYPE_INTERNAL 1
890 #define FF_BUFFER_TYPE_USER 2 ///< direct rendering buffers (image is (de)allocated by user)
891 #define FF_BUFFER_TYPE_SHARED 4 ///< Buffer from somewhere else; don't deallocate image (data/base), all other tables are not shared.
892 #define FF_BUFFER_TYPE_COPY 8 ///< Just a (modified) copy of some other buffer, don't deallocate anything.
894 #define FF_BUFFER_HINTS_VALID 0x01 // Buffer hints value is meaningful (if 0 ignore).
895 #define FF_BUFFER_HINTS_READABLE 0x02 // Codec will read from buffer.
896 #define FF_BUFFER_HINTS_PRESERVE 0x04 // User must not alter buffer content.
897 #define FF_BUFFER_HINTS_REUSABLE 0x08 // Codec will reuse the buffer (update).
900 * @defgroup lavc_packet AVPacket
902 * Types and functions for working with AVPacket.
905 enum AVPacketSideDataType {
907 AV_PKT_DATA_NEW_EXTRADATA,
910 * An AV_PKT_DATA_PARAM_CHANGE side data packet is laid out as follows:
913 * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_COUNT)
914 * s32le channel_count
915 * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_LAYOUT)
916 * u64le channel_layout
917 * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_SAMPLE_RATE)
919 * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_DIMENSIONS)
924 AV_PKT_DATA_PARAM_CHANGE,
927 * An AV_PKT_DATA_H263_MB_INFO side data packet contains a number of
928 * structures with info about macroblocks relevant to splitting the
929 * packet into smaller packets on macroblock edges (e.g. as for RFC 2190).
930 * That is, it does not necessarily contain info about all macroblocks,
931 * as long as the distance between macroblocks in the info is smaller
932 * than the target payload size.
933 * Each MB info structure is 12 bytes, and is laid out as follows:
935 * u32le bit offset from the start of the packet
936 * u8 current quantizer at the start of the macroblock
938 * u16le macroblock address within the GOB
939 * u8 horizontal MV predictor
940 * u8 vertical MV predictor
941 * u8 horizontal MV predictor for block number 3
942 * u8 vertical MV predictor for block number 3
945 AV_PKT_DATA_H263_MB_INFO,
948 * Recommmends skipping the specified number of samples
950 * u32le number of samples to skip from start of this packet
951 * u32le number of samples to skip from end of this packet
952 * u8 reason for start skip
953 * u8 reason for end skip (0=padding silence, 1=convergence)
956 AV_PKT_DATA_SKIP_SAMPLES=70,
959 * An AV_PKT_DATA_JP_DUALMONO side data packet indicates that
960 * the packet may contain "dual mono" audio specific to Japanese DTV
961 * and if it is true, recommends only the selected channel to be used.
963 * u8 selected channels (0=mail/left, 1=sub/right, 2=both)
966 AV_PKT_DATA_JP_DUALMONO,
969 * A list of zero terminated key/value strings. There is no end marker for
970 * the list, so it is required to rely on the side data size to stop.
972 AV_PKT_DATA_STRINGS_METADATA,
975 * Subtitle event position
983 AV_PKT_DATA_SUBTITLE_POSITION,
987 * This structure stores compressed data. It is typically exported by demuxers
988 * and then passed as input to decoders, or received as output from encoders and
989 * then passed to muxers.
991 * For video, it should typically contain one compressed frame. For audio it may
992 * contain several compressed frames.
994 * AVPacket is one of the few structs in FFmpeg, whose size is a part of public
995 * ABI. Thus it may be allocated on stack and no new fields can be added to it
996 * without libavcodec and libavformat major bump.
998 * The semantics of data ownership depends on the destruct field.
999 * If it is set, the packet data is dynamically allocated and is valid
1000 * indefinitely until av_free_packet() is called (which in turn calls the
1001 * destruct callback to free the data). If destruct is not set, the packet data
1002 * is typically backed by some static buffer somewhere and is only valid for a
1003 * limited time (e.g. until the next read call when demuxing).
1005 * The side data is always allocated with av_malloc() and is freed in
1008 typedef struct AVPacket {
1010 * Presentation timestamp in AVStream->time_base units; the time at which
1011 * the decompressed packet will be presented to the user.
1012 * Can be AV_NOPTS_VALUE if it is not stored in the file.
1013 * pts MUST be larger or equal to dts as presentation cannot happen before
1014 * decompression, unless one wants to view hex dumps. Some formats misuse
1015 * the terms dts and pts/cts to mean something different. Such timestamps
1016 * must be converted to true pts/dts before they are stored in AVPacket.
1020 * Decompression timestamp in AVStream->time_base units; the time at which
1021 * the packet is decompressed.
1022 * Can be AV_NOPTS_VALUE if it is not stored in the file.
1029 * A combination of AV_PKT_FLAG values
1033 * Additional packet data that can be provided by the container.
1034 * Packet can contain several types of side information.
1039 enum AVPacketSideDataType type;
1041 int side_data_elems;
1044 * Duration of this packet in AVStream->time_base units, 0 if unknown.
1045 * Equals next_pts - this_pts in presentation order.
1048 void (*destruct)(struct AVPacket *);
1050 int64_t pos; ///< byte position in stream, -1 if unknown
1053 * Time difference in AVStream->time_base units from the pts of this
1054 * packet to the point at which the output from the decoder has converged
1055 * independent from the availability of previous frames. That is, the
1056 * frames are virtually identical no matter if decoding started from
1057 * the very first frame or from this keyframe.
1058 * Is AV_NOPTS_VALUE if unknown.
1059 * This field is not the display duration of the current packet.
1060 * This field has no meaning if the packet does not have AV_PKT_FLAG_KEY
1063 * The purpose of this field is to allow seeking in streams that have no
1064 * keyframes in the conventional sense. It corresponds to the
1065 * recovery point SEI in H.264 and match_time_delta in NUT. It is also
1066 * essential for some types of subtitle streams to ensure that all
1067 * subtitles are correctly displayed after seeking.
1069 int64_t convergence_duration;
1071 #define AV_PKT_FLAG_KEY 0x0001 ///< The packet contains a keyframe
1072 #define AV_PKT_FLAG_CORRUPT 0x0002 ///< The packet content is corrupted
1074 enum AVSideDataParamChangeFlags {
1075 AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_COUNT = 0x0001,
1076 AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_LAYOUT = 0x0002,
1077 AV_SIDE_DATA_PARAM_CHANGE_SAMPLE_RATE = 0x0004,
1078 AV_SIDE_DATA_PARAM_CHANGE_DIMENSIONS = 0x0008,
1085 * This structure describes decoded (raw) audio or video data.
1087 * AVFrame must be allocated using avcodec_alloc_frame() and freed with
1088 * avcodec_free_frame(). Note that this allocates only the AVFrame itself. The
1089 * buffers for the data must be managed through other means.
1091 * AVFrame is typically allocated once and then reused multiple times to hold
1092 * different data (e.g. a single AVFrame to hold frames received from a
1093 * decoder). In such a case, avcodec_get_frame_defaults() should be used to
1094 * reset the frame to its original clean state before it is reused again.
1096 * sizeof(AVFrame) is not a part of the public ABI, so new fields may be added
1097 * to the end with a minor bump.
1098 * Similarly fields that are marked as to be only accessed by
1099 * av_opt_ptr() can be reordered. This allows 2 forks to add fields
1100 * without breaking compatibility with each other.
1102 typedef struct AVFrame {
1103 #define AV_NUM_DATA_POINTERS 8
1105 * pointer to the picture/channel planes.
1106 * This might be different from the first allocated byte
1107 * - encoding: Set by user
1108 * - decoding: set by AVCodecContext.get_buffer()
1110 uint8_t *data[AV_NUM_DATA_POINTERS];
1113 * Size, in bytes, of the data for each picture/channel plane.
1115 * For audio, only linesize[0] may be set. For planar audio, each channel
1116 * plane must be the same size.
1118 * - encoding: Set by user
1119 * - decoding: set by AVCodecContext.get_buffer()
1121 int linesize[AV_NUM_DATA_POINTERS];
1124 * pointers to the data planes/channels.
1126 * For video, this should simply point to data[].
1128 * For planar audio, each channel has a separate data pointer, and
1129 * linesize[0] contains the size of each channel buffer.
1130 * For packed audio, there is just one data pointer, and linesize[0]
1131 * contains the total size of the buffer for all channels.
1133 * Note: Both data and extended_data will always be set by get_buffer(),
1134 * but for planar audio with more channels that can fit in data,
1135 * extended_data must be used by the decoder in order to access all
1138 * encoding: set by user
1139 * decoding: set by AVCodecContext.get_buffer()
1141 uint8_t **extended_data;
1144 * width and height of the video frame
1145 * - encoding: unused
1146 * - decoding: Read by user.
1151 * number of audio samples (per channel) described by this frame
1152 * - encoding: Set by user
1153 * - decoding: Set by libavcodec
1158 * format of the frame, -1 if unknown or unset
1159 * Values correspond to enum AVPixelFormat for video frames,
1160 * enum AVSampleFormat for audio)
1161 * - encoding: unused
1162 * - decoding: Read by user.
1167 * 1 -> keyframe, 0-> not
1168 * - encoding: Set by libavcodec.
1169 * - decoding: Set by libavcodec.
1174 * Picture type of the frame, see ?_TYPE below.
1175 * - encoding: Set by libavcodec. for coded_picture (and set by user for input).
1176 * - decoding: Set by libavcodec.
1178 enum AVPictureType pict_type;
1181 * pointer to the first allocated byte of the picture. Can be used in get_buffer/release_buffer.
1182 * This isn't used by libavcodec unless the default get/release_buffer() is used.
1186 uint8_t *base[AV_NUM_DATA_POINTERS];
1189 * sample aspect ratio for the video frame, 0/1 if unknown/unspecified
1190 * - encoding: unused
1191 * - decoding: Read by user.
1193 AVRational sample_aspect_ratio;
1196 * presentation timestamp in time_base units (time when frame should be shown to user)
1197 * If AV_NOPTS_VALUE then frame_rate = 1/time_base will be assumed.
1198 * - encoding: MUST be set by user.
1199 * - decoding: Set by libavcodec.
1204 * pts copied from the AVPacket that was decoded to produce this frame
1205 * - encoding: unused
1206 * - decoding: Read by user.
1211 * dts copied from the AVPacket that triggered returning this frame
1212 * - encoding: unused
1213 * - decoding: Read by user.
1218 * picture number in bitstream order
1219 * - encoding: set by
1220 * - decoding: Set by libavcodec.
1222 int coded_picture_number;
1224 * picture number in display order
1225 * - encoding: set by
1226 * - decoding: Set by libavcodec.
1228 int display_picture_number;
1231 * quality (between 1 (good) and FF_LAMBDA_MAX (bad))
1232 * - encoding: Set by libavcodec. for coded_picture (and set by user for input).
1233 * - decoding: Set by libavcodec.
1238 * is this picture used as reference
1239 * The values for this are the same as the MpegEncContext.picture_structure
1240 * variable, that is 1->top field, 2->bottom field, 3->frame/both fields.
1241 * Set to 4 for delayed, non-reference frames.
1242 * - encoding: unused
1243 * - decoding: Set by libavcodec. (before get_buffer() call)).
1249 * - encoding: unused
1250 * - decoding: Set by libavcodec.
1252 int8_t *qscale_table;
1255 * - encoding: unused
1256 * - decoding: Set by libavcodec.
1266 * mbskip_table[mb]>=1 if MB didn't change
1267 * stride= mb_width = (width+15)>>4
1268 * - encoding: unused
1269 * - decoding: Set by libavcodec.
1271 uint8_t *mbskip_table;
1274 * motion vector table
1277 * int mv_sample_log2= 4 - motion_subsample_log2;
1278 * int mb_width= (width+15)>>4;
1279 * int mv_stride= (mb_width << mv_sample_log2) + 1;
1280 * motion_val[direction][x + y*mv_stride][0->mv_x, 1->mv_y];
1282 * - encoding: Set by user.
1283 * - decoding: Set by libavcodec.
1285 int16_t (*motion_val[2])[2];
1288 * macroblock type table
1289 * mb_type_base + mb_width + 2
1290 * - encoding: Set by user.
1291 * - decoding: Set by libavcodec.
1297 * - encoding: unused
1298 * - decoding: Set by libavcodec.
1303 * motion reference frame index
1304 * the order in which these are stored can depend on the codec.
1305 * - encoding: Set by user.
1306 * - decoding: Set by libavcodec.
1308 int8_t *ref_index[2];
1311 * for some private data of the user
1312 * - encoding: unused
1313 * - decoding: Set by user.
1319 * - encoding: Set by libavcodec. if flags&CODEC_FLAG_PSNR.
1320 * - decoding: unused
1322 uint64_t error[AV_NUM_DATA_POINTERS];
1325 * type of the buffer (to keep track of who has to deallocate data[*])
1326 * - encoding: Set by the one who allocates it.
1327 * - decoding: Set by the one who allocates it.
1328 * Note: User allocated (direct rendering) & internal buffers cannot coexist currently.
1333 * When decoding, this signals how much the picture must be delayed.
1334 * extra_delay = repeat_pict / (2*fps)
1335 * - encoding: unused
1336 * - decoding: Set by libavcodec.
1341 * The content of the picture is interlaced.
1342 * - encoding: Set by user.
1343 * - decoding: Set by libavcodec. (default 0)
1345 int interlaced_frame;
1348 * If the content is interlaced, is top field displayed first.
1349 * - encoding: Set by user.
1350 * - decoding: Set by libavcodec.
1352 int top_field_first;
1355 * Tell user application that palette has changed from previous frame.
1356 * - encoding: ??? (no palette-enabled encoder yet)
1357 * - decoding: Set by libavcodec. (default 0).
1359 int palette_has_changed;
1362 * codec suggestion on buffer type if != 0
1363 * - encoding: unused
1364 * - decoding: Set by libavcodec. (before get_buffer() call)).
1370 * - encoding: Set by user.
1371 * - decoding: Set by libavcodec.
1373 AVPanScan *pan_scan;
1376 * reordered opaque 64bit (generally an integer or a double precision float
1377 * PTS but can be anything).
1378 * The user sets AVCodecContext.reordered_opaque to represent the input at
1380 * the decoder reorders values as needed and sets AVFrame.reordered_opaque
1381 * to exactly one of the values provided by the user through AVCodecContext.reordered_opaque
1382 * @deprecated in favor of pkt_pts
1383 * - encoding: unused
1384 * - decoding: Read by user.
1386 int64_t reordered_opaque;
1389 * hardware accelerator private data (FFmpeg-allocated)
1390 * - encoding: unused
1391 * - decoding: Set by libavcodec
1393 void *hwaccel_picture_private;
1396 * the AVCodecContext which ff_thread_get_buffer() was last called on
1397 * - encoding: Set by libavcodec.
1398 * - decoding: Set by libavcodec.
1400 struct AVCodecContext *owner;
1403 * used by multithreading to store frame-specific info
1404 * - encoding: Set by libavcodec.
1405 * - decoding: Set by libavcodec.
1407 void *thread_opaque;
1410 * log2 of the size of the block which a single vector in motion_val represents:
1411 * (4->16x16, 3->8x8, 2-> 4x4, 1-> 2x2)
1412 * - encoding: unused
1413 * - decoding: Set by libavcodec.
1415 uint8_t motion_subsample_log2;
1418 * Sample rate of the audio data.
1420 * - encoding: unused
1421 * - decoding: read by user
1426 * Channel layout of the audio data.
1428 * - encoding: unused
1429 * - decoding: read by user.
1431 uint64_t channel_layout;
1434 * frame timestamp estimated using various heuristics, in stream time base
1435 * Code outside libavcodec should access this field using:
1436 * av_frame_get_best_effort_timestamp(frame)
1437 * - encoding: unused
1438 * - decoding: set by libavcodec, read by user.
1440 int64_t best_effort_timestamp;
1443 * reordered pos from the last AVPacket that has been input into the decoder
1444 * Code outside libavcodec should access this field using:
1445 * av_frame_get_pkt_pos(frame)
1446 * - encoding: unused
1447 * - decoding: Read by user.
1452 * duration of the corresponding packet, expressed in
1453 * AVStream->time_base units, 0 if unknown.
1454 * Code outside libavcodec should access this field using:
1455 * av_frame_get_pkt_duration(frame)
1456 * - encoding: unused
1457 * - decoding: Read by user.
1459 int64_t pkt_duration;
1463 * Code outside libavcodec should access this field using:
1464 * av_frame_get_metadata(frame)
1465 * - encoding: Set by user.
1466 * - decoding: Set by libavcodec.
1468 AVDictionary *metadata;
1471 * decode error flags of the frame, set to a combination of
1472 * FF_DECODE_ERROR_xxx flags if the decoder produced a frame, but there
1473 * were errors during the decoding.
1474 * Code outside libavcodec should access this field using:
1475 * av_frame_get_decode_error_flags(frame)
1476 * - encoding: unused
1477 * - decoding: set by libavcodec, read by user.
1479 int decode_error_flags;
1480 #define FF_DECODE_ERROR_INVALID_BITSTREAM 1
1481 #define FF_DECODE_ERROR_MISSING_REFERENCE 2
1484 * number of audio channels, only used for audio.
1485 * Code outside libavcodec should access this field using:
1486 * av_frame_get_channels(frame)
1487 * - encoding: unused
1488 * - decoding: Read by user.
1493 * size of the corresponding packet containing the compressed
1494 * frame. It must be accessed using av_frame_get_pkt_size() and
1495 * av_frame_set_pkt_size().
1496 * It is set to a negative value if unknown.
1497 * - encoding: unused
1498 * - decoding: set by libavcodec, read by user.
1504 * Accessors for some AVFrame fields.
1505 * The position of these field in the structure is not part of the ABI,
1506 * they should not be accessed directly outside libavcodec.
1508 int64_t av_frame_get_best_effort_timestamp(const AVFrame *frame);
1509 void av_frame_set_best_effort_timestamp(AVFrame *frame, int64_t val);
1510 int64_t av_frame_get_pkt_duration (const AVFrame *frame);
1511 void av_frame_set_pkt_duration (AVFrame *frame, int64_t val);
1512 int64_t av_frame_get_pkt_pos (const AVFrame *frame);
1513 void av_frame_set_pkt_pos (AVFrame *frame, int64_t val);
1514 int64_t av_frame_get_channel_layout (const AVFrame *frame);
1515 void av_frame_set_channel_layout (AVFrame *frame, int64_t val);
1516 int av_frame_get_channels (const AVFrame *frame);
1517 void av_frame_set_channels (AVFrame *frame, int val);
1518 int av_frame_get_sample_rate (const AVFrame *frame);
1519 void av_frame_set_sample_rate (AVFrame *frame, int val);
1520 AVDictionary *av_frame_get_metadata (const AVFrame *frame);
1521 void av_frame_set_metadata (AVFrame *frame, AVDictionary *val);
1522 int av_frame_get_decode_error_flags (const AVFrame *frame);
1523 void av_frame_set_decode_error_flags (AVFrame *frame, int val);
1524 int av_frame_get_pkt_size(const AVFrame *frame);
1525 void av_frame_set_pkt_size(AVFrame *frame, int val);
1527 struct AVCodecInternal;
1531 AV_FIELD_PROGRESSIVE,
1532 AV_FIELD_TT, //< Top coded_first, top displayed first
1533 AV_FIELD_BB, //< Bottom coded first, bottom displayed first
1534 AV_FIELD_TB, //< Top coded first, bottom displayed first
1535 AV_FIELD_BT, //< Bottom coded first, top displayed first
1539 * main external API structure.
1540 * New fields can be added to the end with minor version bumps.
1541 * Removal, reordering and changes to existing fields require a major
1543 * Please use AVOptions (av_opt* / av_set/get*()) to access these fields from user
1545 * sizeof(AVCodecContext) must not be used outside libav*.
1547 typedef struct AVCodecContext {
1549 * information on struct for av_log
1550 * - set by avcodec_alloc_context3
1552 const AVClass *av_class;
1553 int log_level_offset;
1555 enum AVMediaType codec_type; /* see AVMEDIA_TYPE_xxx */
1556 const struct AVCodec *codec;
1557 char codec_name[32];
1558 enum AVCodecID codec_id; /* see AV_CODEC_ID_xxx */
1561 * fourcc (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A').
1562 * This is used to work around some encoder bugs.
1563 * A demuxer should set this to what is stored in the field used to identify the codec.
1564 * If there are multiple such fields in a container then the demuxer should choose the one
1565 * which maximizes the information about the used codec.
1566 * If the codec tag field in a container is larger than 32 bits then the demuxer should
1567 * remap the longer ID to 32 bits with a table or other structure. Alternatively a new
1568 * extra_codec_tag + size could be added but for this a clear advantage must be demonstrated
1570 * - encoding: Set by user, if not then the default based on codec_id will be used.
1571 * - decoding: Set by user, will be converted to uppercase by libavcodec during init.
1573 unsigned int codec_tag;
1576 * fourcc from the AVI stream header (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A').
1577 * This is used to work around some encoder bugs.
1578 * - encoding: unused
1579 * - decoding: Set by user, will be converted to uppercase by libavcodec during init.
1581 unsigned int stream_codec_tag;
1585 * @deprecated this field is unused
1587 attribute_deprecated int sub_id;
1593 * Private context used for internal data.
1595 * Unlike priv_data, this is not codec-specific. It is used in general
1596 * libavcodec functions.
1598 struct AVCodecInternal *internal;
1601 * Private data of the user, can be used to carry app specific stuff.
1602 * - encoding: Set by user.
1603 * - decoding: Set by user.
1608 * the average bitrate
1609 * - encoding: Set by user; unused for constant quantizer encoding.
1610 * - decoding: Set by libavcodec. 0 or some bitrate if this info is available in the stream.
1615 * number of bits the bitstream is allowed to diverge from the reference.
1616 * the reference can be CBR (for CBR pass1) or VBR (for pass2)
1617 * - encoding: Set by user; unused for constant quantizer encoding.
1618 * - decoding: unused
1620 int bit_rate_tolerance;
1623 * Global quality for codecs which cannot change it per frame.
1624 * This should be proportional to MPEG-1/2/4 qscale.
1625 * - encoding: Set by user.
1626 * - decoding: unused
1631 * - encoding: Set by user.
1632 * - decoding: unused
1634 int compression_level;
1635 #define FF_COMPRESSION_DEFAULT -1
1639 * - encoding: Set by user.
1640 * - decoding: Set by user.
1646 * - encoding: Set by user.
1647 * - decoding: Set by user.
1652 * some codecs need / can use extradata like Huffman tables.
1653 * mjpeg: Huffman tables
1654 * rv10: additional flags
1655 * mpeg4: global headers (they can be in the bitstream or here)
1656 * The allocated memory should be FF_INPUT_BUFFER_PADDING_SIZE bytes larger
1657 * than extradata_size to avoid prolems if it is read with the bitstream reader.
1658 * The bytewise contents of extradata must not depend on the architecture or CPU endianness.
1659 * - encoding: Set/allocated/freed by libavcodec.
1660 * - decoding: Set/allocated/freed by user.
1666 * This is the fundamental unit of time (in seconds) in terms
1667 * of which frame timestamps are represented. For fixed-fps content,
1668 * timebase should be 1/framerate and timestamp increments should be
1670 * - encoding: MUST be set by user.
1671 * - decoding: Set by libavcodec.
1673 AVRational time_base;
1676 * For some codecs, the time base is closer to the field rate than the frame rate.
1677 * Most notably, H.264 and MPEG-2 specify time_base as half of frame duration
1678 * if no telecine is used ...
1680 * Set to time_base ticks per frame. Default 1, e.g., H.264/MPEG-2 set it to 2.
1682 int ticks_per_frame;
1687 * Encoding: Number of frames delay there will be from the encoder input to
1688 * the decoder output. (we assume the decoder matches the spec)
1689 * Decoding: Number of frames delay in addition to what a standard decoder
1690 * as specified in the spec would produce.
1693 * Number of frames the decoded output will be delayed relative to the
1697 * For encoding, this is the number of "priming" samples added to the
1698 * beginning of the stream. The decoded output will be delayed by this
1699 * many samples relative to the input to the encoder. Note that this
1700 * field is purely informational and does not directly affect the pts
1701 * output by the encoder, which should always be based on the actual
1702 * presentation time, including any delay.
1703 * For decoding, this is the number of samples the decoder needs to
1704 * output before the decoder's output is valid. When seeking, you should
1705 * start decoding this many samples prior to your desired seek point.
1707 * - encoding: Set by libavcodec.
1708 * - decoding: Set by libavcodec.
1715 * picture width / height.
1716 * - encoding: MUST be set by user.
1717 * - decoding: Set by libavcodec.
1718 * Note: For compatibility it is possible to set this instead of
1719 * coded_width/height before decoding.
1724 * Bitstream width / height, may be different from width/height if lowres enabled.
1725 * - encoding: unused
1726 * - decoding: Set by user before init if known. Codec should override / dynamically change if needed.
1728 int coded_width, coded_height;
1730 #define FF_ASPECT_EXTENDED 15
1733 * the number of pictures in a group of pictures, or 0 for intra_only
1734 * - encoding: Set by user.
1735 * - decoding: unused
1740 * Pixel format, see AV_PIX_FMT_xxx.
1741 * May be set by the demuxer if known from headers.
1742 * May be overridden by the decoder if it knows better.
1743 * - encoding: Set by user.
1744 * - decoding: Set by user if known, overridden by libavcodec if known
1746 enum AVPixelFormat pix_fmt;
1749 * Motion estimation algorithm used for video coding.
1750 * 1 (zero), 2 (full), 3 (log), 4 (phods), 5 (epzs), 6 (x1), 7 (hex),
1751 * 8 (umh), 9 (iter), 10 (tesa) [7, 8, 10 are x264 specific, 9 is snow specific]
1752 * - encoding: MUST be set by user.
1753 * - decoding: unused
1758 * If non NULL, 'draw_horiz_band' is called by the libavcodec
1759 * decoder to draw a horizontal band. It improves cache usage. Not
1760 * all codecs can do that. You must check the codec capabilities
1762 * When multithreading is used, it may be called from multiple threads
1763 * at the same time; threads might draw different parts of the same AVFrame,
1764 * or multiple AVFrames, and there is no guarantee that slices will be drawn
1766 * The function is also used by hardware acceleration APIs.
1767 * It is called at least once during frame decoding to pass
1768 * the data needed for hardware render.
1769 * In that mode instead of pixel data, AVFrame points to
1770 * a structure specific to the acceleration API. The application
1771 * reads the structure and can change some fields to indicate progress
1773 * - encoding: unused
1774 * - decoding: Set by user.
1775 * @param height the height of the slice
1776 * @param y the y position of the slice
1777 * @param type 1->top field, 2->bottom field, 3->frame
1778 * @param offset offset into the AVFrame.data from which the slice should be read
1780 void (*draw_horiz_band)(struct AVCodecContext *s,
1781 const AVFrame *src, int offset[AV_NUM_DATA_POINTERS],
1782 int y, int type, int height);
1785 * callback to negotiate the pixelFormat
1786 * @param fmt is the list of formats which are supported by the codec,
1787 * it is terminated by -1 as 0 is a valid format, the formats are ordered by quality.
1788 * The first is always the native one.
1789 * @return the chosen format
1790 * - encoding: unused
1791 * - decoding: Set by user, if not set the native format will be chosen.
1793 enum AVPixelFormat (*get_format)(struct AVCodecContext *s, const enum AVPixelFormat * fmt);
1796 * maximum number of B-frames between non-B-frames
1797 * Note: The output will be delayed by max_b_frames+1 relative to the input.
1798 * - encoding: Set by user.
1799 * - decoding: unused
1804 * qscale factor between IP and B-frames
1805 * If > 0 then the last P-frame quantizer will be used (q= lastp_q*factor+offset).
1806 * If < 0 then normal ratecontrol will be done (q= -normal_q*factor+offset).
1807 * - encoding: Set by user.
1808 * - decoding: unused
1810 float b_quant_factor;
1812 /** obsolete FIXME remove */
1814 #define FF_RC_STRATEGY_XVID 1
1816 int b_frame_strategy;
1818 #if FF_API_MPV_GLOBAL_OPTS
1820 * luma single coefficient elimination threshold
1821 * - encoding: Set by user.
1822 * - decoding: unused
1824 attribute_deprecated int luma_elim_threshold;
1827 * chroma single coeff elimination threshold
1828 * - encoding: Set by user.
1829 * - decoding: unused
1831 attribute_deprecated int chroma_elim_threshold;
1835 * qscale offset between IP and B-frames
1836 * - encoding: Set by user.
1837 * - decoding: unused
1839 float b_quant_offset;
1842 * Size of the frame reordering buffer in the decoder.
1843 * For MPEG-2 it is 1 IPB or 0 low delay IP.
1844 * - encoding: Set by libavcodec.
1845 * - decoding: Set by libavcodec.
1850 * 0-> h263 quant 1-> mpeg quant
1851 * - encoding: Set by user.
1852 * - decoding: unused
1857 * qscale factor between P and I-frames
1858 * If > 0 then the last p frame quantizer will be used (q= lastp_q*factor+offset).
1859 * If < 0 then normal ratecontrol will be done (q= -normal_q*factor+offset).
1860 * - encoding: Set by user.
1861 * - decoding: unused
1863 float i_quant_factor;
1866 * qscale offset between P and I-frames
1867 * - encoding: Set by user.
1868 * - decoding: unused
1870 float i_quant_offset;
1873 * luminance masking (0-> disabled)
1874 * - encoding: Set by user.
1875 * - decoding: unused
1880 * temporary complexity masking (0-> disabled)
1881 * - encoding: Set by user.
1882 * - decoding: unused
1884 float temporal_cplx_masking;
1887 * spatial complexity masking (0-> disabled)
1888 * - encoding: Set by user.
1889 * - decoding: unused
1891 float spatial_cplx_masking;
1894 * p block masking (0-> disabled)
1895 * - encoding: Set by user.
1896 * - decoding: unused
1901 * darkness masking (0-> disabled)
1902 * - encoding: Set by user.
1903 * - decoding: unused
1909 * - encoding: Set by libavcodec.
1910 * - decoding: Set by user (or 0).
1914 * prediction method (needed for huffyuv)
1915 * - encoding: Set by user.
1916 * - decoding: unused
1918 int prediction_method;
1919 #define FF_PRED_LEFT 0
1920 #define FF_PRED_PLANE 1
1921 #define FF_PRED_MEDIAN 2
1924 * slice offsets in the frame in bytes
1925 * - encoding: Set/allocated by libavcodec.
1926 * - decoding: Set/allocated by user (or NULL).
1931 * sample aspect ratio (0 if unknown)
1932 * That is the width of a pixel divided by the height of the pixel.
1933 * Numerator and denominator must be relatively prime and smaller than 256 for some video standards.
1934 * - encoding: Set by user.
1935 * - decoding: Set by libavcodec.
1937 AVRational sample_aspect_ratio;
1940 * motion estimation comparison function
1941 * - encoding: Set by user.
1942 * - decoding: unused
1946 * subpixel motion estimation comparison function
1947 * - encoding: Set by user.
1948 * - decoding: unused
1952 * macroblock comparison function (not supported yet)
1953 * - encoding: Set by user.
1954 * - decoding: unused
1958 * interlaced DCT comparison function
1959 * - encoding: Set by user.
1960 * - decoding: unused
1963 #define FF_CMP_SAD 0
1964 #define FF_CMP_SSE 1
1965 #define FF_CMP_SATD 2
1966 #define FF_CMP_DCT 3
1967 #define FF_CMP_PSNR 4
1968 #define FF_CMP_BIT 5
1970 #define FF_CMP_ZERO 7
1971 #define FF_CMP_VSAD 8
1972 #define FF_CMP_VSSE 9
1973 #define FF_CMP_NSSE 10
1974 #define FF_CMP_W53 11
1975 #define FF_CMP_W97 12
1976 #define FF_CMP_DCTMAX 13
1977 #define FF_CMP_DCT264 14
1978 #define FF_CMP_CHROMA 256
1981 * ME diamond size & shape
1982 * - encoding: Set by user.
1983 * - decoding: unused
1988 * amount of previous MV predictors (2a+1 x 2a+1 square)
1989 * - encoding: Set by user.
1990 * - decoding: unused
1992 int last_predictor_count;
1995 * prepass for motion estimation
1996 * - encoding: Set by user.
1997 * - decoding: unused
2002 * motion estimation prepass comparison function
2003 * - encoding: Set by user.
2004 * - decoding: unused
2009 * ME prepass diamond size & shape
2010 * - encoding: Set by user.
2011 * - decoding: unused
2017 * - encoding: Set by user.
2018 * - decoding: unused
2020 int me_subpel_quality;
2023 * DTG active format information (additional aspect ratio
2024 * information only used in DVB MPEG-2 transport streams)
2027 * - encoding: unused
2028 * - decoding: Set by decoder.
2030 int dtg_active_format;
2031 #define FF_DTG_AFD_SAME 8
2032 #define FF_DTG_AFD_4_3 9
2033 #define FF_DTG_AFD_16_9 10
2034 #define FF_DTG_AFD_14_9 11
2035 #define FF_DTG_AFD_4_3_SP_14_9 13
2036 #define FF_DTG_AFD_16_9_SP_14_9 14
2037 #define FF_DTG_AFD_SP_4_3 15
2040 * maximum motion estimation search range in subpel units
2041 * If 0 then no limit.
2043 * - encoding: Set by user.
2044 * - decoding: unused
2049 * intra quantizer bias
2050 * - encoding: Set by user.
2051 * - decoding: unused
2053 int intra_quant_bias;
2054 #define FF_DEFAULT_QUANT_BIAS 999999
2057 * inter quantizer bias
2058 * - encoding: Set by user.
2059 * - decoding: unused
2061 int inter_quant_bias;
2063 #if FF_API_COLOR_TABLE_ID
2066 * - encoding: unused
2067 * - decoding: Which clrtable should be used for 8bit RGB images.
2068 * Tables have to be stored somewhere. FIXME
2070 attribute_deprecated int color_table_id;
2075 * - encoding: unused
2076 * - decoding: Set by user.
2079 #define SLICE_FLAG_CODED_ORDER 0x0001 ///< draw_horiz_band() is called in coded order instead of display
2080 #define SLICE_FLAG_ALLOW_FIELD 0x0002 ///< allow draw_horiz_band() with field slices (MPEG2 field pics)
2081 #define SLICE_FLAG_ALLOW_PLANE 0x0004 ///< allow draw_horiz_band() with 1 component at a time (SVQ1)
2084 * XVideo Motion Acceleration
2085 * - encoding: forbidden
2086 * - decoding: set by decoder
2088 int xvmc_acceleration;
2091 * macroblock decision mode
2092 * - encoding: Set by user.
2093 * - decoding: unused
2096 #define FF_MB_DECISION_SIMPLE 0 ///< uses mb_cmp
2097 #define FF_MB_DECISION_BITS 1 ///< chooses the one which needs the fewest bits
2098 #define FF_MB_DECISION_RD 2 ///< rate distortion
2101 * custom intra quantization matrix
2102 * - encoding: Set by user, can be NULL.
2103 * - decoding: Set by libavcodec.
2105 uint16_t *intra_matrix;
2108 * custom inter quantization matrix
2109 * - encoding: Set by user, can be NULL.
2110 * - decoding: Set by libavcodec.
2112 uint16_t *inter_matrix;
2115 * scene change detection threshold
2116 * 0 is default, larger means fewer detected scene changes.
2117 * - encoding: Set by user.
2118 * - decoding: unused
2120 int scenechange_threshold;
2123 * noise reduction strength
2124 * - encoding: Set by user.
2125 * - decoding: unused
2127 int noise_reduction;
2129 #if FF_API_INTER_THRESHOLD
2131 * @deprecated this field is unused
2133 attribute_deprecated int inter_threshold;
2136 #if FF_API_MPV_GLOBAL_OPTS
2138 * @deprecated use mpegvideo private options instead
2140 attribute_deprecated int quantizer_noise_shaping;
2144 * Motion estimation threshold below which no motion estimation is
2145 * performed, but instead the user specified motion vectors are used.
2147 * - encoding: Set by user.
2148 * - decoding: unused
2153 * Macroblock threshold below which the user specified macroblock types will be used.
2154 * - encoding: Set by user.
2155 * - decoding: unused
2160 * precision of the intra DC coefficient - 8
2161 * - encoding: Set by user.
2162 * - decoding: unused
2164 int intra_dc_precision;
2167 * Number of macroblock rows at the top which are skipped.
2168 * - encoding: unused
2169 * - decoding: Set by user.
2174 * Number of macroblock rows at the bottom which are skipped.
2175 * - encoding: unused
2176 * - decoding: Set by user.
2181 * Border processing masking, raises the quantizer for mbs on the borders
2183 * - encoding: Set by user.
2184 * - decoding: unused
2186 float border_masking;
2189 * minimum MB lagrange multipler
2190 * - encoding: Set by user.
2191 * - decoding: unused
2196 * maximum MB lagrange multipler
2197 * - encoding: Set by user.
2198 * - decoding: unused
2204 * - encoding: Set by user.
2205 * - decoding: unused
2207 int me_penalty_compensation;
2211 * - encoding: Set by user.
2212 * - decoding: unused
2218 * - encoding: Set by user.
2219 * - decoding: unused
2225 * - encoding: Set by user.
2226 * - decoding: unused
2231 * number of reference frames
2232 * - encoding: Set by user.
2233 * - decoding: Set by lavc.
2238 * chroma qp offset from luma
2239 * - encoding: Set by user.
2240 * - decoding: unused
2245 * Multiplied by qscale for each frame and added to scene_change_score.
2246 * - encoding: Set by user.
2247 * - decoding: unused
2249 int scenechange_factor;
2253 * Note: Value depends upon the compare function used for fullpel ME.
2254 * - encoding: Set by user.
2255 * - decoding: unused
2260 * Adjust sensitivity of b_frame_strategy 1.
2261 * - encoding: Set by user.
2262 * - decoding: unused
2267 * Chromaticity coordinates of the source primaries.
2268 * - encoding: Set by user
2269 * - decoding: Set by libavcodec
2271 enum AVColorPrimaries color_primaries;
2274 * Color Transfer Characteristic.
2275 * - encoding: Set by user
2276 * - decoding: Set by libavcodec
2278 enum AVColorTransferCharacteristic color_trc;
2281 * YUV colorspace type.
2282 * - encoding: Set by user
2283 * - decoding: Set by libavcodec
2285 enum AVColorSpace colorspace;
2288 * MPEG vs JPEG YUV range.
2289 * - encoding: Set by user
2290 * - decoding: Set by libavcodec
2292 enum AVColorRange color_range;
2295 * This defines the location of chroma samples.
2296 * - encoding: Set by user
2297 * - decoding: Set by libavcodec
2299 enum AVChromaLocation chroma_sample_location;
2303 * Indicates number of picture subdivisions. Used for parallelized
2305 * - encoding: Set by user
2306 * - decoding: unused
2311 * - encoding: set by libavcodec
2312 * - decoding: Set by user.
2314 enum AVFieldOrder field_order;
2317 int sample_rate; ///< samples per second
2318 int channels; ///< number of audio channels
2321 * audio sample format
2322 * - encoding: Set by user.
2323 * - decoding: Set by libavcodec.
2325 enum AVSampleFormat sample_fmt; ///< sample format
2327 /* The following data should not be initialized. */
2329 * Number of samples per channel in an audio frame.
2331 * - encoding: set by libavcodec in avcodec_open2(). Each submitted frame
2332 * except the last must contain exactly frame_size samples per channel.
2333 * May be 0 when the codec has CODEC_CAP_VARIABLE_FRAME_SIZE set, then the
2334 * frame size is not restricted.
2335 * - decoding: may be set by some decoders to indicate constant frame size
2340 * Frame counter, set by libavcodec.
2342 * - decoding: total number of frames returned from the decoder so far.
2343 * - encoding: total number of frames passed to the encoder so far.
2345 * @note the counter is not incremented if encoding/decoding resulted in
2351 * number of bytes per packet if constant and known or 0
2352 * Used by some WAV based audio codecs.
2357 * Audio cutoff bandwidth (0 means "automatic")
2358 * - encoding: Set by user.
2359 * - decoding: unused
2363 #if FF_API_REQUEST_CHANNELS
2365 * Decoder should decode to this many channels if it can (0 for default)
2366 * - encoding: unused
2367 * - decoding: Set by user.
2368 * @deprecated Deprecated in favor of request_channel_layout.
2370 int request_channels;
2374 * Audio channel layout.
2375 * - encoding: set by user.
2376 * - decoding: set by user, may be overwritten by libavcodec.
2378 uint64_t channel_layout;
2381 * Request decoder to use this channel layout if it can (0 for default)
2382 * - encoding: unused
2383 * - decoding: Set by user.
2385 uint64_t request_channel_layout;
2388 * Type of service that the audio stream conveys.
2389 * - encoding: Set by user.
2390 * - decoding: Set by libavcodec.
2392 enum AVAudioServiceType audio_service_type;
2395 * desired sample format
2396 * - encoding: Not used.
2397 * - decoding: Set by user.
2398 * Decoder will decode to this format if it can.
2400 enum AVSampleFormat request_sample_fmt;
2403 * Called at the beginning of each frame to get a buffer for it.
2405 * The function will set AVFrame.data[], AVFrame.linesize[].
2406 * AVFrame.extended_data[] must also be set, but it should be the same as
2407 * AVFrame.data[] except for planar audio with more channels than can fit
2408 * in AVFrame.data[]. In that case, AVFrame.data[] shall still contain as
2409 * many data pointers as it can hold.
2411 * if CODEC_CAP_DR1 is not set then get_buffer() must call
2412 * avcodec_default_get_buffer() instead of providing buffers allocated by
2415 * AVFrame.data[] should be 32- or 16-byte-aligned unless the CPU doesn't
2416 * need it. avcodec_default_get_buffer() aligns the output buffer properly,
2417 * but if get_buffer() is overridden then alignment considerations should
2418 * be taken into account.
2420 * @see avcodec_default_get_buffer()
2424 * If pic.reference is set then the frame will be read later by libavcodec.
2425 * avcodec_align_dimensions2() should be used to find the required width and
2426 * height, as they normally need to be rounded up to the next multiple of 16.
2428 * If frame multithreading is used and thread_safe_callbacks is set,
2429 * it may be called from a different thread, but not from more than one at
2430 * once. Does not need to be reentrant.
2432 * @see release_buffer(), reget_buffer()
2433 * @see avcodec_align_dimensions2()
2437 * Decoders request a buffer of a particular size by setting
2438 * AVFrame.nb_samples prior to calling get_buffer(). The decoder may,
2439 * however, utilize only part of the buffer by setting AVFrame.nb_samples
2440 * to a smaller value in the output frame.
2442 * Decoders cannot use the buffer after returning from
2443 * avcodec_decode_audio4(), so they will not call release_buffer(), as it
2444 * is assumed to be released immediately upon return. In some rare cases,
2445 * a decoder may need to call get_buffer() more than once in a single
2446 * call to avcodec_decode_audio4(). In that case, when get_buffer() is
2447 * called again after it has already been called once, the previously
2448 * acquired buffer is assumed to be released at that time and may not be
2449 * reused by the decoder.
2451 * As a convenience, av_samples_get_buffer_size() and
2452 * av_samples_fill_arrays() in libavutil may be used by custom get_buffer()
2453 * functions to find the required data size and to fill data pointers and
2454 * linesize. In AVFrame.linesize, only linesize[0] may be set for audio
2455 * since all planes must be the same size.
2457 * @see av_samples_get_buffer_size(), av_samples_fill_arrays()
2459 * - encoding: unused
2460 * - decoding: Set by libavcodec, user can override.
2462 int (*get_buffer)(struct AVCodecContext *c, AVFrame *pic);
2465 * Called to release buffers which were allocated with get_buffer.
2466 * A released buffer can be reused in get_buffer().
2467 * pic.data[*] must be set to NULL.
2468 * May be called from a different thread if frame multithreading is used,
2469 * but not by more than one thread at once, so does not need to be reentrant.
2470 * - encoding: unused
2471 * - decoding: Set by libavcodec, user can override.
2473 void (*release_buffer)(struct AVCodecContext *c, AVFrame *pic);
2476 * Called at the beginning of a frame to get cr buffer for it.
2477 * Buffer type (size, hints) must be the same. libavcodec won't check it.
2478 * libavcodec will pass previous buffer in pic, function should return
2479 * same buffer or new buffer with old frame "painted" into it.
2480 * If pic.data[0] == NULL must behave like get_buffer().
2481 * if CODEC_CAP_DR1 is not set then reget_buffer() must call
2482 * avcodec_default_reget_buffer() instead of providing buffers allocated by
2484 * - encoding: unused
2485 * - decoding: Set by libavcodec, user can override.
2487 int (*reget_buffer)(struct AVCodecContext *c, AVFrame *pic);
2490 /* - encoding parameters */
2491 float qcompress; ///< amount of qscale change between easy & hard scenes (0.0-1.0)
2492 float qblur; ///< amount of qscale smoothing over time (0.0-1.0)
2496 * - encoding: Set by user.
2497 * - decoding: unused
2503 * - encoding: Set by user.
2504 * - decoding: unused
2509 * maximum quantizer difference between frames
2510 * - encoding: Set by user.
2511 * - decoding: unused
2516 * ratecontrol qmin qmax limiting method
2517 * 0-> clipping, 1-> use a nice continuous function to limit qscale wthin qmin/qmax.
2518 * - encoding: Set by user.
2519 * - decoding: unused
2527 * decoder bitstream buffer size
2528 * - encoding: Set by user.
2529 * - decoding: unused
2534 * ratecontrol override, see RcOverride
2535 * - encoding: Allocated/set/freed by user.
2536 * - decoding: unused
2538 int rc_override_count;
2539 RcOverride *rc_override;
2542 * rate control equation
2543 * - encoding: Set by user
2544 * - decoding: unused
2550 * - encoding: Set by user.
2551 * - decoding: unused
2557 * - encoding: Set by user.
2558 * - decoding: unused
2562 float rc_buffer_aggressivity;
2565 * initial complexity for pass1 ratecontrol
2566 * - encoding: Set by user.
2567 * - decoding: unused
2569 float rc_initial_cplx;
2572 * Ratecontrol attempt to use, at maximum, <value> of what can be used without an underflow.
2573 * - encoding: Set by user.
2574 * - decoding: unused.
2576 float rc_max_available_vbv_use;
2579 * Ratecontrol attempt to use, at least, <value> times the amount needed to prevent a vbv overflow.
2580 * - encoding: Set by user.
2581 * - decoding: unused.
2583 float rc_min_vbv_overflow_use;
2586 * Number of bits which should be loaded into the rc buffer before decoding starts.
2587 * - encoding: Set by user.
2588 * - decoding: unused
2590 int rc_initial_buffer_occupancy;
2592 #define FF_CODER_TYPE_VLC 0
2593 #define FF_CODER_TYPE_AC 1
2594 #define FF_CODER_TYPE_RAW 2
2595 #define FF_CODER_TYPE_RLE 3
2596 #define FF_CODER_TYPE_DEFLATE 4
2599 * - encoding: Set by user.
2600 * - decoding: unused
2606 * - encoding: Set by user.
2607 * - decoding: unused
2612 * minimum Lagrange multipler
2613 * - encoding: Set by user.
2614 * - decoding: unused
2619 * maximum Lagrange multipler
2620 * - encoding: Set by user.
2621 * - decoding: unused
2626 * frame skip threshold
2627 * - encoding: Set by user.
2628 * - decoding: unused
2630 int frame_skip_threshold;
2634 * - encoding: Set by user.
2635 * - decoding: unused
2637 int frame_skip_factor;
2640 * frame skip exponent
2641 * - encoding: Set by user.
2642 * - decoding: unused
2647 * frame skip comparison function
2648 * - encoding: Set by user.
2649 * - decoding: unused
2654 * trellis RD quantization
2655 * - encoding: Set by user.
2656 * - decoding: unused
2661 * - encoding: Set by user.
2662 * - decoding: unused
2664 int min_prediction_order;
2667 * - encoding: Set by user.
2668 * - decoding: unused
2670 int max_prediction_order;
2673 * GOP timecode frame start number
2674 * - encoding: Set by user, in non drop frame format
2675 * - decoding: Set by libavcodec (timecode in the 25 bits format, -1 if unset)
2677 int64_t timecode_frame_start;
2679 /* The RTP callback: This function is called */
2680 /* every time the encoder has a packet to send. */
2681 /* It depends on the encoder if the data starts */
2682 /* with a Start Code (it should). H.263 does. */
2683 /* mb_nb contains the number of macroblocks */
2684 /* encoded in the RTP payload. */
2685 void (*rtp_callback)(struct AVCodecContext *avctx, void *data, int size, int mb_nb);
2687 int rtp_payload_size; /* The size of the RTP payload: the coder will */
2688 /* do its best to deliver a chunk with size */
2689 /* below rtp_payload_size, the chunk will start */
2690 /* with a start code on some codecs like H.263. */
2691 /* This doesn't take account of any particular */
2692 /* headers inside the transmitted RTP payload. */
2694 /* statistics, used for 2-pass encoding */
2705 * number of bits used for the previously encoded frame
2706 * - encoding: Set by libavcodec.
2707 * - decoding: unused
2712 * pass1 encoding statistics output buffer
2713 * - encoding: Set by libavcodec.
2714 * - decoding: unused
2719 * pass2 encoding statistics input buffer
2720 * Concatenated stuff from stats_out of pass1 should be placed here.
2721 * - encoding: Allocated/set/freed by user.
2722 * - decoding: unused
2727 * Work around bugs in encoders which sometimes cannot be detected automatically.
2728 * - encoding: Set by user
2729 * - decoding: Set by user
2731 int workaround_bugs;
2732 #define FF_BUG_AUTODETECT 1 ///< autodetection
2733 #define FF_BUG_OLD_MSMPEG4 2
2734 #define FF_BUG_XVID_ILACE 4
2735 #define FF_BUG_UMP4 8
2736 #define FF_BUG_NO_PADDING 16
2737 #define FF_BUG_AMV 32
2738 #define FF_BUG_AC_VLC 0 ///< Will be removed, libavcodec can now handle these non-compliant files by default.
2739 #define FF_BUG_QPEL_CHROMA 64
2740 #define FF_BUG_STD_QPEL 128
2741 #define FF_BUG_QPEL_CHROMA2 256
2742 #define FF_BUG_DIRECT_BLOCKSIZE 512
2743 #define FF_BUG_EDGE 1024
2744 #define FF_BUG_HPEL_CHROMA 2048
2745 #define FF_BUG_DC_CLIP 4096
2746 #define FF_BUG_MS 8192 ///< Work around various bugs in Microsoft's broken decoders.
2747 #define FF_BUG_TRUNCATED 16384
2750 * strictly follow the standard (MPEG4, ...).
2751 * - encoding: Set by user.
2752 * - decoding: Set by user.
2753 * Setting this to STRICT or higher means the encoder and decoder will
2754 * generally do stupid things, whereas setting it to unofficial or lower
2755 * will mean the encoder might produce output that is not supported by all
2756 * spec-compliant decoders. Decoders don't differentiate between normal,
2757 * unofficial and experimental (that is, they always try to decode things
2758 * when they can) unless they are explicitly asked to behave stupidly
2759 * (=strictly conform to the specs)
2761 int strict_std_compliance;
2762 #define FF_COMPLIANCE_VERY_STRICT 2 ///< Strictly conform to an older more strict version of the spec or reference software.
2763 #define FF_COMPLIANCE_STRICT 1 ///< Strictly conform to all the things in the spec no matter what consequences.
2764 #define FF_COMPLIANCE_NORMAL 0
2765 #define FF_COMPLIANCE_UNOFFICIAL -1 ///< Allow unofficial extensions
2766 #define FF_COMPLIANCE_EXPERIMENTAL -2 ///< Allow nonstandardized experimental things.
2769 * error concealment flags
2770 * - encoding: unused
2771 * - decoding: Set by user.
2773 int error_concealment;
2774 #define FF_EC_GUESS_MVS 1
2775 #define FF_EC_DEBLOCK 2
2779 * - encoding: Set by user.
2780 * - decoding: Set by user.
2783 #define FF_DEBUG_PICT_INFO 1
2784 #define FF_DEBUG_RC 2
2785 #define FF_DEBUG_BITSTREAM 4
2786 #define FF_DEBUG_MB_TYPE 8
2787 #define FF_DEBUG_QP 16
2788 #define FF_DEBUG_MV 32
2789 #define FF_DEBUG_DCT_COEFF 0x00000040
2790 #define FF_DEBUG_SKIP 0x00000080
2791 #define FF_DEBUG_STARTCODE 0x00000100
2792 #define FF_DEBUG_PTS 0x00000200
2793 #define FF_DEBUG_ER 0x00000400
2794 #define FF_DEBUG_MMCO 0x00000800
2795 #define FF_DEBUG_BUGS 0x00001000
2796 #define FF_DEBUG_VIS_QP 0x00002000
2797 #define FF_DEBUG_VIS_MB_TYPE 0x00004000
2798 #define FF_DEBUG_BUFFERS 0x00008000
2799 #define FF_DEBUG_THREADS 0x00010000
2803 * - encoding: Set by user.
2804 * - decoding: Set by user.
2807 #define FF_DEBUG_VIS_MV_P_FOR 0x00000001 //visualize forward predicted MVs of P frames
2808 #define FF_DEBUG_VIS_MV_B_FOR 0x00000002 //visualize forward predicted MVs of B frames
2809 #define FF_DEBUG_VIS_MV_B_BACK 0x00000004 //visualize backward predicted MVs of B frames
2812 * Error recognition; may misdetect some more or less valid parts as errors.
2813 * - encoding: unused
2814 * - decoding: Set by user.
2816 int err_recognition;
2817 #define AV_EF_CRCCHECK (1<<0)
2818 #define AV_EF_BITSTREAM (1<<1)
2819 #define AV_EF_BUFFER (1<<2)
2820 #define AV_EF_EXPLODE (1<<3)
2822 #define AV_EF_CAREFUL (1<<16)
2823 #define AV_EF_COMPLIANT (1<<17)
2824 #define AV_EF_AGGRESSIVE (1<<18)
2828 * opaque 64bit number (generally a PTS) that will be reordered and
2829 * output in AVFrame.reordered_opaque
2830 * @deprecated in favor of pkt_pts
2831 * - encoding: unused
2832 * - decoding: Set by user.
2834 int64_t reordered_opaque;
2837 * Hardware accelerator in use
2838 * - encoding: unused.
2839 * - decoding: Set by libavcodec
2841 struct AVHWAccel *hwaccel;
2844 * Hardware accelerator context.
2845 * For some hardware accelerators, a global context needs to be
2846 * provided by the user. In that case, this holds display-dependent
2847 * data FFmpeg cannot instantiate itself. Please refer to the
2848 * FFmpeg HW accelerator documentation to know how to fill this
2849 * is. e.g. for VA API, this is a struct vaapi_context.
2850 * - encoding: unused
2851 * - decoding: Set by user
2853 void *hwaccel_context;
2857 * - encoding: Set by libavcodec if flags&CODEC_FLAG_PSNR.
2858 * - decoding: unused
2860 uint64_t error[AV_NUM_DATA_POINTERS];
2863 * DCT algorithm, see FF_DCT_* below
2864 * - encoding: Set by user.
2865 * - decoding: unused
2868 #define FF_DCT_AUTO 0
2869 #define FF_DCT_FASTINT 1
2870 #define FF_DCT_INT 2
2871 #define FF_DCT_MMX 3
2872 #define FF_DCT_ALTIVEC 5
2873 #define FF_DCT_FAAN 6
2876 * IDCT algorithm, see FF_IDCT_* below.
2877 * - encoding: Set by user.
2878 * - decoding: Set by user.
2881 #define FF_IDCT_AUTO 0
2882 #define FF_IDCT_INT 1
2883 #define FF_IDCT_SIMPLE 2
2884 #define FF_IDCT_SIMPLEMMX 3
2885 #define FF_IDCT_LIBMPEG2MMX 4
2887 #define FF_IDCT_MMI 5
2889 #define FF_IDCT_ARM 7
2890 #define FF_IDCT_ALTIVEC 8
2891 #define FF_IDCT_SH4 9
2892 #define FF_IDCT_SIMPLEARM 10
2893 #define FF_IDCT_H264 11
2894 #define FF_IDCT_VP3 12
2895 #define FF_IDCT_IPP 13
2896 #define FF_IDCT_XVIDMMX 14
2897 #define FF_IDCT_CAVS 15
2898 #define FF_IDCT_SIMPLEARMV5TE 16
2899 #define FF_IDCT_SIMPLEARMV6 17
2900 #define FF_IDCT_SIMPLEVIS 18
2901 #define FF_IDCT_WMV2 19
2902 #define FF_IDCT_FAAN 20
2903 #define FF_IDCT_EA 21
2904 #define FF_IDCT_SIMPLENEON 22
2905 #define FF_IDCT_SIMPLEALPHA 23
2906 #define FF_IDCT_BINK 24
2911 * @deprecated use av_set_cpu_flags_mask() instead.
2913 attribute_deprecated unsigned dsp_mask;
2917 * bits per sample/pixel from the demuxer (needed for huffyuv).
2918 * - encoding: Set by libavcodec.
2919 * - decoding: Set by user.
2921 int bits_per_coded_sample;
2924 * Bits per sample/pixel of internal libavcodec pixel/sample format.
2925 * - encoding: set by user.
2926 * - decoding: set by libavcodec.
2928 int bits_per_raw_sample;
2931 * low resolution decoding, 1-> 1/2 size, 2->1/4 size
2932 * - encoding: unused
2933 * - decoding: Set by user.
2938 * the picture in the bitstream
2939 * - encoding: Set by libavcodec.
2940 * - decoding: Set by libavcodec.
2942 AVFrame *coded_frame;
2946 * is used to decide how many independent tasks should be passed to execute()
2947 * - encoding: Set by user.
2948 * - decoding: Set by user.
2953 * Which multithreading methods to use.
2954 * Use of FF_THREAD_FRAME will increase decoding delay by one frame per thread,
2955 * so clients which cannot provide future frames should not use it.
2957 * - encoding: Set by user, otherwise the default is used.
2958 * - decoding: Set by user, otherwise the default is used.
2961 #define FF_THREAD_FRAME 1 ///< Decode more than one frame at once
2962 #define FF_THREAD_SLICE 2 ///< Decode more than one part of a single frame at once
2965 * Which multithreading methods are in use by the codec.
2966 * - encoding: Set by libavcodec.
2967 * - decoding: Set by libavcodec.
2969 int active_thread_type;
2972 * Set by the client if its custom get_buffer() callback can be called
2973 * synchronously from another thread, which allows faster multithreaded decoding.
2974 * draw_horiz_band() will be called from other threads regardless of this setting.
2975 * Ignored if the default get_buffer() is used.
2976 * - encoding: Set by user.
2977 * - decoding: Set by user.
2979 int thread_safe_callbacks;
2982 * The codec may call this to execute several independent things.
2983 * It will return only after finishing all tasks.
2984 * The user may replace this with some multithreaded implementation,
2985 * the default implementation will execute the parts serially.
2986 * @param count the number of things to execute
2987 * - encoding: Set by libavcodec, user can override.
2988 * - decoding: Set by libavcodec, user can override.
2990 int (*execute)(struct AVCodecContext *c, int (*func)(struct AVCodecContext *c2, void *arg), void *arg2, int *ret, int count, int size);
2993 * The codec may call this to execute several independent things.
2994 * It will return only after finishing all tasks.
2995 * The user may replace this with some multithreaded implementation,
2996 * the default implementation will execute the parts serially.
2997 * Also see avcodec_thread_init and e.g. the --enable-pthread configure option.
2998 * @param c context passed also to func
2999 * @param count the number of things to execute
3000 * @param arg2 argument passed unchanged to func
3001 * @param ret return values of executed functions, must have space for "count" values. May be NULL.
3002 * @param func function that will be called count times, with jobnr from 0 to count-1.
3003 * threadnr will be in the range 0 to c->thread_count-1 < MAX_THREADS and so that no
3004 * two instances of func executing at the same time will have the same threadnr.
3005 * @return always 0 currently, but code should handle a future improvement where when any call to func
3006 * returns < 0 no further calls to func may be done and < 0 is returned.
3007 * - encoding: Set by libavcodec, user can override.
3008 * - decoding: Set by libavcodec, user can override.
3010 int (*execute2)(struct AVCodecContext *c, int (*func)(struct AVCodecContext *c2, void *arg, int jobnr, int threadnr), void *arg2, int *ret, int count);
3014 * Can be used by execute() to store some per AVCodecContext stuff.
3015 * - encoding: set by execute()
3016 * - decoding: set by execute()
3018 void *thread_opaque;
3021 * noise vs. sse weight for the nsse comparsion function
3022 * - encoding: Set by user.
3023 * - decoding: unused
3029 * - encoding: Set by user.
3030 * - decoding: Set by libavcodec.
3033 #define FF_PROFILE_UNKNOWN -99
3034 #define FF_PROFILE_RESERVED -100
3036 #define FF_PROFILE_AAC_MAIN 0
3037 #define FF_PROFILE_AAC_LOW 1
3038 #define FF_PROFILE_AAC_SSR 2
3039 #define FF_PROFILE_AAC_LTP 3
3040 #define FF_PROFILE_AAC_HE 4
3041 #define FF_PROFILE_AAC_HE_V2 28
3042 #define FF_PROFILE_AAC_LD 22
3043 #define FF_PROFILE_AAC_ELD 38
3045 #define FF_PROFILE_DTS 20
3046 #define FF_PROFILE_DTS_ES 30
3047 #define FF_PROFILE_DTS_96_24 40
3048 #define FF_PROFILE_DTS_HD_HRA 50
3049 #define FF_PROFILE_DTS_HD_MA 60
3051 #define FF_PROFILE_MPEG2_422 0
3052 #define FF_PROFILE_MPEG2_HIGH 1
3053 #define FF_PROFILE_MPEG2_SS 2
3054 #define FF_PROFILE_MPEG2_SNR_SCALABLE 3
3055 #define FF_PROFILE_MPEG2_MAIN 4
3056 #define FF_PROFILE_MPEG2_SIMPLE 5
3058 #define FF_PROFILE_H264_CONSTRAINED (1<<9) // 8+1; constraint_set1_flag
3059 #define FF_PROFILE_H264_INTRA (1<<11) // 8+3; constraint_set3_flag
3061 #define FF_PROFILE_H264_BASELINE 66
3062 #define FF_PROFILE_H264_CONSTRAINED_BASELINE (66|FF_PROFILE_H264_CONSTRAINED)
3063 #define FF_PROFILE_H264_MAIN 77
3064 #define FF_PROFILE_H264_EXTENDED 88
3065 #define FF_PROFILE_H264_HIGH 100
3066 #define FF_PROFILE_H264_HIGH_10 110
3067 #define FF_PROFILE_H264_HIGH_10_INTRA (110|FF_PROFILE_H264_INTRA)
3068 #define FF_PROFILE_H264_HIGH_422 122
3069 #define FF_PROFILE_H264_HIGH_422_INTRA (122|FF_PROFILE_H264_INTRA)
3070 #define FF_PROFILE_H264_HIGH_444 144
3071 #define FF_PROFILE_H264_HIGH_444_PREDICTIVE 244
3072 #define FF_PROFILE_H264_HIGH_444_INTRA (244|FF_PROFILE_H264_INTRA)
3073 #define FF_PROFILE_H264_CAVLC_444 44
3075 #define FF_PROFILE_VC1_SIMPLE 0
3076 #define FF_PROFILE_VC1_MAIN 1
3077 #define FF_PROFILE_VC1_COMPLEX 2
3078 #define FF_PROFILE_VC1_ADVANCED 3
3080 #define FF_PROFILE_MPEG4_SIMPLE 0
3081 #define FF_PROFILE_MPEG4_SIMPLE_SCALABLE 1
3082 #define FF_PROFILE_MPEG4_CORE 2
3083 #define FF_PROFILE_MPEG4_MAIN 3
3084 #define FF_PROFILE_MPEG4_N_BIT 4
3085 #define FF_PROFILE_MPEG4_SCALABLE_TEXTURE 5
3086 #define FF_PROFILE_MPEG4_SIMPLE_FACE_ANIMATION 6
3087 #define FF_PROFILE_MPEG4_BASIC_ANIMATED_TEXTURE 7
3088 #define FF_PROFILE_MPEG4_HYBRID 8
3089 #define FF_PROFILE_MPEG4_ADVANCED_REAL_TIME 9
3090 #define FF_PROFILE_MPEG4_CORE_SCALABLE 10
3091 #define FF_PROFILE_MPEG4_ADVANCED_CODING 11
3092 #define FF_PROFILE_MPEG4_ADVANCED_CORE 12
3093 #define FF_PROFILE_MPEG4_ADVANCED_SCALABLE_TEXTURE 13
3094 #define FF_PROFILE_MPEG4_SIMPLE_STUDIO 14
3095 #define FF_PROFILE_MPEG4_ADVANCED_SIMPLE 15
3099 * - encoding: Set by user.
3100 * - decoding: Set by libavcodec.
3103 #define FF_LEVEL_UNKNOWN -99
3107 * - encoding: unused
3108 * - decoding: Set by user.
3110 enum AVDiscard skip_loop_filter;
3114 * - encoding: unused
3115 * - decoding: Set by user.
3117 enum AVDiscard skip_idct;
3121 * - encoding: unused
3122 * - decoding: Set by user.
3124 enum AVDiscard skip_frame;
3127 * Header containing style information for text subtitles.
3128 * For SUBTITLE_ASS subtitle type, it should contain the whole ASS
3129 * [Script Info] and [V4+ Styles] section, plus the [Events] line and
3130 * the Format line following. It shouldn't include any Dialogue line.
3131 * - encoding: Set/allocated/freed by user (before avcodec_open2())
3132 * - decoding: Set/allocated/freed by libavcodec (by avcodec_open2())
3134 uint8_t *subtitle_header;
3135 int subtitle_header_size;
3138 * Simulates errors in the bitstream to test error concealment.
3139 * - encoding: Set by user.
3140 * - decoding: unused
3145 * Current packet as passed into the decoder, to avoid having
3146 * to pass the packet into every function. Currently only valid
3147 * inside lavc and get/release_buffer callbacks.
3148 * - decoding: set by avcodec_decode_*, read by get_buffer() for setting pkt_pts
3149 * - encoding: unused
3154 * VBV delay coded in the last frame (in periods of a 27 MHz clock).
3155 * Used for compliant TS muxing.
3156 * - encoding: Set by libavcodec.
3157 * - decoding: unused.
3162 * Timebase in which pkt_dts/pts and AVPacket.dts/pts are.
3163 * Code outside libavcodec should access this field using:
3164 * avcodec_set_pkt_timebase(avctx)
3165 * - encoding unused.
3166 * - decodimg set by user
3168 AVRational pkt_timebase;
3172 * Code outside libavcodec should access this field using:
3173 * avcodec_get_codec_descriptior(avctx)
3174 * - encoding: unused.
3175 * - decoding: set by libavcodec.
3177 const AVCodecDescriptor *codec_descriptor;
3180 * Current statistics for PTS correction.
3181 * - decoding: maintained and used by libavcodec, not intended to be used by user apps
3182 * - encoding: unused
3184 int64_t pts_correction_num_faulty_pts; /// Number of incorrect PTS values so far
3185 int64_t pts_correction_num_faulty_dts; /// Number of incorrect DTS values so far
3186 int64_t pts_correction_last_pts; /// PTS of the last frame
3187 int64_t pts_correction_last_dts; /// DTS of the last frame
3190 * Current frame metadata.
3191 * - decoding: maintained and used by libavcodec, not intended to be used by user apps
3192 * - encoding: unused
3194 AVDictionary *metadata;
3197 AVRational av_codec_get_pkt_timebase (const AVCodecContext *avctx);
3198 void av_codec_set_pkt_timebase (AVCodecContext *avctx, AVRational val);
3200 const AVCodecDescriptor *av_codec_get_codec_descriptor(const AVCodecContext *avctx);
3201 void av_codec_set_codec_descriptor(AVCodecContext *avctx, const AVCodecDescriptor *desc);
3206 typedef struct AVProfile {
3208 const char *name; ///< short name for the profile
3211 typedef struct AVCodecDefault AVCodecDefault;
3218 typedef struct AVCodec {
3220 * Name of the codec implementation.
3221 * The name is globally unique among encoders and among decoders (but an
3222 * encoder and a decoder can share the same name).
3223 * This is the primary way to find a codec from the user perspective.
3227 * Descriptive name for the codec, meant to be more human readable than name.
3228 * You should use the NULL_IF_CONFIG_SMALL() macro to define it.
3230 const char *long_name;
3231 enum AVMediaType type;
3234 * Codec capabilities.
3238 const AVRational *supported_framerates; ///< array of supported framerates, or NULL if any, array is terminated by {0,0}
3239 const enum AVPixelFormat *pix_fmts; ///< array of supported pixel formats, or NULL if unknown, array is terminated by -1
3240 const int *supported_samplerates; ///< array of supported audio samplerates, or NULL if unknown, array is terminated by 0
3241 const enum AVSampleFormat *sample_fmts; ///< array of supported sample formats, or NULL if unknown, array is terminated by -1
3242 const uint64_t *channel_layouts; ///< array of support channel layouts, or NULL if unknown. array is terminated by 0
3243 uint8_t max_lowres; ///< maximum value for lowres supported by the decoder
3244 const AVClass *priv_class; ///< AVClass for the private context
3245 const AVProfile *profiles; ///< array of recognized profiles, or NULL if unknown, array is terminated by {FF_PROFILE_UNKNOWN}
3247 /*****************************************************************
3248 * No fields below this line are part of the public API. They
3249 * may not be used outside of libavcodec and can be changed and
3251 * New public fields should be added right above.
3252 *****************************************************************
3255 struct AVCodec *next;
3257 * @name Frame-level threading support functions
3261 * If defined, called on thread contexts when they are created.
3262 * If the codec allocates writable tables in init(), re-allocate them here.
3263 * priv_data will be set to a copy of the original.
3265 int (*init_thread_copy)(AVCodecContext *);
3267 * Copy necessary context variables from a previous thread context to the current one.
3268 * If not defined, the next thread will start automatically; otherwise, the codec
3269 * must call ff_thread_finish_setup().
3271 * dst and src will (rarely) point to the same context, in which case memcpy should be skipped.
3273 int (*update_thread_context)(AVCodecContext *dst, const AVCodecContext *src);
3277 * Private codec-specific defaults.
3279 const AVCodecDefault *defaults;
3282 * Initialize codec static data, called from avcodec_register().
3284 void (*init_static_data)(struct AVCodec *codec);
3286 int (*init)(AVCodecContext *);
3287 int (*encode_sub)(AVCodecContext *, uint8_t *buf, int buf_size,
3288 const struct AVSubtitle *sub);
3290 * Encode data to an AVPacket.
3292 * @param avctx codec context
3293 * @param avpkt output AVPacket (may contain a user-provided buffer)
3294 * @param[in] frame AVFrame containing the raw data to be encoded
3295 * @param[out] got_packet_ptr encoder sets to 0 or 1 to indicate that a
3296 * non-empty packet was returned in avpkt.
3297 * @return 0 on success, negative error code on failure
3299 int (*encode2)(AVCodecContext *avctx, AVPacket *avpkt, const AVFrame *frame,
3300 int *got_packet_ptr);
3301 int (*decode)(AVCodecContext *, void *outdata, int *outdata_size, AVPacket *avpkt);
3302 int (*close)(AVCodecContext *);
3305 * Will be called when seeking
3307 void (*flush)(AVCodecContext *);
3313 typedef struct AVHWAccel {
3315 * Name of the hardware accelerated codec.
3316 * The name is globally unique among encoders and among decoders (but an
3317 * encoder and a decoder can share the same name).
3322 * Type of codec implemented by the hardware accelerator.
3324 * See AVMEDIA_TYPE_xxx
3326 enum AVMediaType type;
3329 * Codec implemented by the hardware accelerator.
3331 * See AV_CODEC_ID_xxx
3336 * Supported pixel format.
3338 * Only hardware accelerated formats are supported here.
3340 enum AVPixelFormat pix_fmt;
3343 * Hardware accelerated codec capabilities.
3344 * see FF_HWACCEL_CODEC_CAP_*
3348 struct AVHWAccel *next;
3351 * Called at the beginning of each frame or field picture.
3353 * Meaningful frame information (codec specific) is guaranteed to
3354 * be parsed at this point. This function is mandatory.
3356 * Note that buf can be NULL along with buf_size set to 0.
3357 * Otherwise, this means the whole frame is available at this point.
3359 * @param avctx the codec context
3360 * @param buf the frame data buffer base
3361 * @param buf_size the size of the frame in bytes
3362 * @return zero if successful, a negative value otherwise
3364 int (*start_frame)(AVCodecContext *avctx, const uint8_t *buf, uint32_t buf_size);
3367 * Callback for each slice.
3369 * Meaningful slice information (codec specific) is guaranteed to
3370 * be parsed at this point. This function is mandatory.
3372 * @param avctx the codec context
3373 * @param buf the slice data buffer base
3374 * @param buf_size the size of the slice in bytes
3375 * @return zero if successful, a negative value otherwise
3377 int (*decode_slice)(AVCodecContext *avctx, const uint8_t *buf, uint32_t buf_size);
3380 * Called at the end of each frame or field picture.
3382 * The whole picture is parsed at this point and can now be sent
3383 * to the hardware accelerator. This function is mandatory.
3385 * @param avctx the codec context
3386 * @return zero if successful, a negative value otherwise
3388 int (*end_frame)(AVCodecContext *avctx);
3391 * Size of HW accelerator private data.
3393 * Private data is allocated with av_mallocz() before
3394 * AVCodecContext.get_buffer() and deallocated after
3395 * AVCodecContext.release_buffer().
3401 * @defgroup lavc_picture AVPicture
3403 * Functions for working with AVPicture
3408 * four components are given, that's all.
3409 * the last component is alpha
3411 typedef struct AVPicture {
3412 uint8_t *data[AV_NUM_DATA_POINTERS];
3413 int linesize[AV_NUM_DATA_POINTERS]; ///< number of bytes per line
3420 enum AVSubtitleType {
3423 SUBTITLE_BITMAP, ///< A bitmap, pict will be set
3426 * Plain text, the text field must be set by the decoder and is
3427 * authoritative. ass and pict fields may contain approximations.
3432 * Formatted text, the ass field must be set by the decoder and is
3433 * authoritative. pict and text fields may contain approximations.
3438 #define AV_SUBTITLE_FLAG_FORCED 0x00000001
3440 typedef struct AVSubtitleRect {
3441 int x; ///< top left corner of pict, undefined when pict is not set
3442 int y; ///< top left corner of pict, undefined when pict is not set
3443 int w; ///< width of pict, undefined when pict is not set
3444 int h; ///< height of pict, undefined when pict is not set
3445 int nb_colors; ///< number of colors in pict, undefined when pict is not set
3448 * data+linesize for the bitmap of this subtitle.
3449 * can be set for text/ass as well once they where rendered
3452 enum AVSubtitleType type;
3454 char *text; ///< 0 terminated plain UTF-8 text
3457 * 0 terminated ASS/SSA compatible event line.
3458 * The presentation of this is unaffected by the other values in this
3466 typedef struct AVSubtitle {
3467 uint16_t format; /* 0 = graphics */
3468 uint32_t start_display_time; /* relative to packet pts, in ms */
3469 uint32_t end_display_time; /* relative to packet pts, in ms */
3471 AVSubtitleRect **rects;
3472 int64_t pts; ///< Same as packet pts, in AV_TIME_BASE
3476 * If c is NULL, returns the first registered codec,
3477 * if c is non-NULL, returns the next registered codec after c,
3478 * or NULL if c is the last one.
3480 AVCodec *av_codec_next(const AVCodec *c);
3483 * Return the LIBAVCODEC_VERSION_INT constant.
3485 unsigned avcodec_version(void);
3488 * Return the libavcodec build-time configuration.
3490 const char *avcodec_configuration(void);
3493 * Return the libavcodec license.
3495 const char *avcodec_license(void);
3498 * Register the codec codec and initialize libavcodec.
3500 * @warning either this function or avcodec_register_all() must be called
3501 * before any other libavcodec functions.
3503 * @see avcodec_register_all()
3505 void avcodec_register(AVCodec *codec);
3508 * Register all the codecs, parsers and bitstream filters which were enabled at
3509 * configuration time. If you do not call this function you can select exactly
3510 * which formats you want to support, by using the individual registration
3513 * @see avcodec_register
3514 * @see av_register_codec_parser
3515 * @see av_register_bitstream_filter
3517 void avcodec_register_all(void);
3520 #if FF_API_ALLOC_CONTEXT
3522 * Allocate an AVCodecContext and set its fields to default values. The
3523 * resulting struct can be deallocated by simply calling av_free().
3525 * @return An AVCodecContext filled with default values or NULL on failure.
3526 * @see avcodec_get_context_defaults
3528 * @deprecated use avcodec_alloc_context3()
3530 attribute_deprecated
3531 AVCodecContext *avcodec_alloc_context(void);
3533 /** THIS FUNCTION IS NOT YET PART OF THE PUBLIC API!
3534 * we WILL change its arguments and name a few times! */
3535 attribute_deprecated
3536 AVCodecContext *avcodec_alloc_context2(enum AVMediaType);
3539 * Set the fields of the given AVCodecContext to default values.
3541 * @param s The AVCodecContext of which the fields should be set to default values.
3542 * @deprecated use avcodec_get_context_defaults3
3544 attribute_deprecated
3545 void avcodec_get_context_defaults(AVCodecContext *s);
3547 /** THIS FUNCTION IS NOT YET PART OF THE PUBLIC API!
3548 * we WILL change its arguments and name a few times! */
3549 attribute_deprecated
3550 void avcodec_get_context_defaults2(AVCodecContext *s, enum AVMediaType);
3554 * Allocate an AVCodecContext and set its fields to default values. The
3555 * resulting struct can be deallocated by calling avcodec_close() on it followed
3558 * @param codec if non-NULL, allocate private data and initialize defaults
3559 * for the given codec. It is illegal to then call avcodec_open2()
3560 * with a different codec.
3561 * If NULL, then the codec-specific defaults won't be initialized,
3562 * which may result in suboptimal default settings (this is
3563 * important mainly for encoders, e.g. libx264).
3565 * @return An AVCodecContext filled with default values or NULL on failure.
3566 * @see avcodec_get_context_defaults
3568 AVCodecContext *avcodec_alloc_context3(const AVCodec *codec);
3571 * Set the fields of the given AVCodecContext to default values corresponding
3572 * to the given codec (defaults may be codec-dependent).
3574 * Do not call this function if a non-NULL codec has been passed
3575 * to avcodec_alloc_context3() that allocated this AVCodecContext.
3576 * If codec is non-NULL, it is illegal to call avcodec_open2() with a
3577 * different codec on this AVCodecContext.
3579 int avcodec_get_context_defaults3(AVCodecContext *s, const AVCodec *codec);
3582 * Get the AVClass for AVCodecContext. It can be used in combination with
3583 * AV_OPT_SEARCH_FAKE_OBJ for examining options.
3585 * @see av_opt_find().
3587 const AVClass *avcodec_get_class(void);
3590 * Get the AVClass for AVFrame. It can be used in combination with
3591 * AV_OPT_SEARCH_FAKE_OBJ for examining options.
3593 * @see av_opt_find().
3595 const AVClass *avcodec_get_frame_class(void);
3598 * Get the AVClass for AVSubtitleRect. It can be used in combination with
3599 * AV_OPT_SEARCH_FAKE_OBJ for examining options.
3601 * @see av_opt_find().
3603 const AVClass *avcodec_get_subtitle_rect_class(void);
3606 * Copy the settings of the source AVCodecContext into the destination
3607 * AVCodecContext. The resulting destination codec context will be
3608 * unopened, i.e. you are required to call avcodec_open2() before you
3609 * can use this AVCodecContext to decode/encode video/audio data.
3611 * @param dest target codec context, should be initialized with
3612 * avcodec_alloc_context3(), but otherwise uninitialized
3613 * @param src source codec context
3614 * @return AVERROR() on error (e.g. memory allocation error), 0 on success
3616 int avcodec_copy_context(AVCodecContext *dest, const AVCodecContext *src);
3619 * Allocate an AVFrame and set its fields to default values. The resulting
3620 * struct must be freed using avcodec_free_frame().
3622 * @return An AVFrame filled with default values or NULL on failure.
3623 * @see avcodec_get_frame_defaults
3625 AVFrame *avcodec_alloc_frame(void);
3628 * Set the fields of the given AVFrame to default values.
3630 * @param frame The AVFrame of which the fields should be set to default values.
3632 void avcodec_get_frame_defaults(AVFrame *frame);
3635 * Free the frame and any dynamically allocated objects in it,
3636 * e.g. extended_data.
3638 * @param frame frame to be freed. The pointer will be set to NULL.
3640 * @warning this function does NOT free the data buffers themselves
3641 * (it does not know how, since they might have been allocated with
3642 * a custom get_buffer()).
3644 void avcodec_free_frame(AVFrame **frame);
3646 #if FF_API_AVCODEC_OPEN
3648 * Initialize the AVCodecContext to use the given AVCodec. Prior to using this
3649 * function the context has to be allocated.
3651 * The functions avcodec_find_decoder_by_name(), avcodec_find_encoder_by_name(),
3652 * avcodec_find_decoder() and avcodec_find_encoder() provide an easy way for
3653 * retrieving a codec.
3655 * @warning This function is not thread safe!
3658 * avcodec_register_all();
3659 * codec = avcodec_find_decoder(AV_CODEC_ID_H264);
3663 * context = avcodec_alloc_context3(codec);
3665 * if (avcodec_open(context, codec) < 0)
3669 * @param avctx The context which will be set up to use the given codec.
3670 * @param codec The codec to use within the context.
3671 * @return zero on success, a negative value on error
3672 * @see avcodec_alloc_context3, avcodec_find_decoder, avcodec_find_encoder, avcodec_close
3674 * @deprecated use avcodec_open2
3676 attribute_deprecated
3677 int avcodec_open(AVCodecContext *avctx, AVCodec *codec);
3681 * Initialize the AVCodecContext to use the given AVCodec. Prior to using this
3682 * function the context has to be allocated with avcodec_alloc_context3().
3684 * The functions avcodec_find_decoder_by_name(), avcodec_find_encoder_by_name(),
3685 * avcodec_find_decoder() and avcodec_find_encoder() provide an easy way for
3686 * retrieving a codec.
3688 * @warning This function is not thread safe!
3691 * avcodec_register_all();
3692 * av_dict_set(&opts, "b", "2.5M", 0);
3693 * codec = avcodec_find_decoder(AV_CODEC_ID_H264);
3697 * context = avcodec_alloc_context3(codec);
3699 * if (avcodec_open2(context, codec, opts) < 0)
3703 * @param avctx The context to initialize.
3704 * @param codec The codec to open this context for. If a non-NULL codec has been
3705 * previously passed to avcodec_alloc_context3() or
3706 * avcodec_get_context_defaults3() for this context, then this
3707 * parameter MUST be either NULL or equal to the previously passed
3709 * @param options A dictionary filled with AVCodecContext and codec-private options.
3710 * On return this object will be filled with options that were not found.
3712 * @return zero on success, a negative value on error
3713 * @see avcodec_alloc_context3(), avcodec_find_decoder(), avcodec_find_encoder(),
3714 * av_dict_set(), av_opt_find().
3716 int avcodec_open2(AVCodecContext *avctx, const AVCodec *codec, AVDictionary **options);
3719 * Close a given AVCodecContext and free all the data associated with it
3720 * (but not the AVCodecContext itself).
3722 * Calling this function on an AVCodecContext that hasn't been opened will free
3723 * the codec-specific data allocated in avcodec_alloc_context3() /
3724 * avcodec_get_context_defaults3() with a non-NULL codec. Subsequent calls will
3727 int avcodec_close(AVCodecContext *avctx);
3730 * Free all allocated data in the given subtitle struct.
3732 * @param sub AVSubtitle to free.
3734 void avsubtitle_free(AVSubtitle *sub);
3741 * @addtogroup lavc_packet
3746 * Default packet destructor.
3748 void av_destruct_packet(AVPacket *pkt);
3751 * Initialize optional fields of a packet with default values.
3753 * Note, this does not touch the data and size members, which have to be
3754 * initialized separately.
3758 void av_init_packet(AVPacket *pkt);
3761 * Allocate the payload of a packet and initialize its fields with
3765 * @param size wanted payload size
3766 * @return 0 if OK, AVERROR_xxx otherwise
3768 int av_new_packet(AVPacket *pkt, int size);
3771 * Reduce packet size, correctly zeroing padding
3774 * @param size new size
3776 void av_shrink_packet(AVPacket *pkt, int size);
3779 * Increase packet size, correctly zeroing padding
3782 * @param grow_by number of bytes by which to increase the size of the packet
3784 int av_grow_packet(AVPacket *pkt, int grow_by);
3787 * @warning This is a hack - the packet memory allocation stuff is broken. The
3788 * packet is allocated if it was not really allocated.
3790 int av_dup_packet(AVPacket *pkt);
3793 * Copy packet, including contents
3795 * @return 0 on success, negative AVERROR on fail
3797 int av_copy_packet(AVPacket *dst, AVPacket *src);
3802 * @param pkt packet to free
3804 void av_free_packet(AVPacket *pkt);
3807 * Allocate new information of a packet.
3810 * @param type side information type
3811 * @param size side information size
3812 * @return pointer to fresh allocated data or NULL otherwise
3814 uint8_t* av_packet_new_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
3818 * Shrink the already allocated side data buffer
3821 * @param type side information type
3822 * @param size new side information size
3823 * @return 0 on success, < 0 on failure
3825 int av_packet_shrink_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
3829 * Get side information from packet.
3832 * @param type desired side information type
3833 * @param size pointer for side information size to store (optional)
3834 * @return pointer to data if present or NULL otherwise
3836 uint8_t* av_packet_get_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
3839 int av_packet_merge_side_data(AVPacket *pkt);
3841 int av_packet_split_side_data(AVPacket *pkt);
3849 * @addtogroup lavc_decoding
3854 * Find a registered decoder with a matching codec ID.
3856 * @param id AVCodecID of the requested decoder
3857 * @return A decoder if one was found, NULL otherwise.
3859 AVCodec *avcodec_find_decoder(enum AVCodecID id);
3862 * Find a registered decoder with the specified name.
3864 * @param name name of the requested decoder
3865 * @return A decoder if one was found, NULL otherwise.
3867 AVCodec *avcodec_find_decoder_by_name(const char *name);
3869 int avcodec_default_get_buffer(AVCodecContext *s, AVFrame *pic);
3870 void avcodec_default_release_buffer(AVCodecContext *s, AVFrame *pic);
3871 int avcodec_default_reget_buffer(AVCodecContext *s, AVFrame *pic);
3874 * Return the amount of padding in pixels which the get_buffer callback must
3875 * provide around the edge of the image for codecs which do not have the
3876 * CODEC_FLAG_EMU_EDGE flag.
3878 * @return Required padding in pixels.
3880 unsigned avcodec_get_edge_width(void);
3883 * Modify width and height values so that they will result in a memory
3884 * buffer that is acceptable for the codec if you do not use any horizontal
3887 * May only be used if a codec with CODEC_CAP_DR1 has been opened.
3888 * If CODEC_FLAG_EMU_EDGE is not set, the dimensions must have been increased
3889 * according to avcodec_get_edge_width() before.
3891 void avcodec_align_dimensions(AVCodecContext *s, int *width, int *height);
3894 * Modify width and height values so that they will result in a memory
3895 * buffer that is acceptable for the codec if you also ensure that all
3896 * line sizes are a multiple of the respective linesize_align[i].
3898 * May only be used if a codec with CODEC_CAP_DR1 has been opened.
3899 * If CODEC_FLAG_EMU_EDGE is not set, the dimensions must have been increased
3900 * according to avcodec_get_edge_width() before.
3902 void avcodec_align_dimensions2(AVCodecContext *s, int *width, int *height,
3903 int linesize_align[AV_NUM_DATA_POINTERS]);
3905 #if FF_API_OLD_DECODE_AUDIO
3907 * Wrapper function which calls avcodec_decode_audio4.
3909 * @deprecated Use avcodec_decode_audio4 instead.
3911 * Decode the audio frame of size avpkt->size from avpkt->data into samples.
3912 * Some decoders may support multiple frames in a single AVPacket, such
3913 * decoders would then just decode the first frame. In this case,
3914 * avcodec_decode_audio3 has to be called again with an AVPacket that contains
3915 * the remaining data in order to decode the second frame etc.
3917 * could be outputted, frame_size_ptr is zero. Otherwise, it is the
3918 * decompressed frame size in bytes.
3920 * @warning You must set frame_size_ptr to the allocated size of the
3921 * output buffer before calling avcodec_decode_audio3().
3923 * @warning The input buffer must be FF_INPUT_BUFFER_PADDING_SIZE larger than
3924 * the actual read bytes because some optimized bitstream readers read 32 or 64
3925 * bits at once and could read over the end.
3927 * @warning The end of the input buffer avpkt->data should be set to 0 to ensure that
3928 * no overreading happens for damaged MPEG streams.
3930 * @warning You must not provide a custom get_buffer() when using
3931 * avcodec_decode_audio3(). Doing so will override it with
3932 * avcodec_default_get_buffer. Use avcodec_decode_audio4() instead,
3933 * which does allow the application to provide a custom get_buffer().
3935 * @note You might have to align the input buffer avpkt->data and output buffer
3936 * samples. The alignment requirements depend on the CPU: On some CPUs it isn't
3937 * necessary at all, on others it won't work at all if not aligned and on others
3938 * it will work but it will have an impact on performance.
3940 * In practice, avpkt->data should have 4 byte alignment at minimum and
3941 * samples should be 16 byte aligned unless the CPU doesn't need it
3942 * (AltiVec and SSE do).
3944 * @note Codecs which have the CODEC_CAP_DELAY capability set have a delay
3945 * between input and output, these need to be fed with avpkt->data=NULL,
3946 * avpkt->size=0 at the end to return the remaining frames.
3948 * @param avctx the codec context
3949 * @param[out] samples the output buffer, sample type in avctx->sample_fmt
3950 * If the sample format is planar, each channel plane will
3951 * be the same size, with no padding between channels.
3952 * @param[in,out] frame_size_ptr the output buffer size in bytes
3953 * @param[in] avpkt The input AVPacket containing the input buffer.
3954 * You can create such packet with av_init_packet() and by then setting
3955 * data and size, some decoders might in addition need other fields.
3956 * All decoders are designed to use the least fields possible though.
3957 * @return On error a negative value is returned, otherwise the number of bytes
3958 * used or zero if no frame data was decompressed (used) from the input AVPacket.
3960 attribute_deprecated int avcodec_decode_audio3(AVCodecContext *avctx, int16_t *samples,
3961 int *frame_size_ptr,
3966 * Decode the audio frame of size avpkt->size from avpkt->data into frame.
3968 * Some decoders may support multiple frames in a single AVPacket. Such
3969 * decoders would then just decode the first frame. In this case,
3970 * avcodec_decode_audio4 has to be called again with an AVPacket containing
3971 * the remaining data in order to decode the second frame, etc...
3972 * Even if no frames are returned, the packet needs to be fed to the decoder
3973 * with remaining data until it is completely consumed or an error occurs.
3975 * @warning The input buffer, avpkt->data must be FF_INPUT_BUFFER_PADDING_SIZE
3976 * larger than the actual read bytes because some optimized bitstream
3977 * readers read 32 or 64 bits at once and could read over the end.
3979 * @note You might have to align the input buffer. The alignment requirements
3980 * depend on the CPU and the decoder.
3982 * @param avctx the codec context
3983 * @param[out] frame The AVFrame in which to store decoded audio samples.
3984 * Decoders request a buffer of a particular size by setting
3985 * AVFrame.nb_samples prior to calling get_buffer(). The
3986 * decoder may, however, only utilize part of the buffer by
3987 * setting AVFrame.nb_samples to a smaller value in the
3989 * @param[out] got_frame_ptr Zero if no frame could be decoded, otherwise it is
3991 * @param[in] avpkt The input AVPacket containing the input buffer.
3992 * At least avpkt->data and avpkt->size should be set. Some
3993 * decoders might also require additional fields to be set.
3994 * @return A negative error code is returned if an error occurred during
3995 * decoding, otherwise the number of bytes consumed from the input
3996 * AVPacket is returned.
3998 int avcodec_decode_audio4(AVCodecContext *avctx, AVFrame *frame,
3999 int *got_frame_ptr, const AVPacket *avpkt);
4002 * Decode the video frame of size avpkt->size from avpkt->data into picture.
4003 * Some decoders may support multiple frames in a single AVPacket, such
4004 * decoders would then just decode the first frame.
4006 * @warning The input buffer must be FF_INPUT_BUFFER_PADDING_SIZE larger than
4007 * the actual read bytes because some optimized bitstream readers read 32 or 64
4008 * bits at once and could read over the end.
4010 * @warning The end of the input buffer buf should be set to 0 to ensure that
4011 * no overreading happens for damaged MPEG streams.
4013 * @note You might have to align the input buffer avpkt->data.
4014 * The alignment requirements depend on the CPU: on some CPUs it isn't
4015 * necessary at all, on others it won't work at all if not aligned and on others
4016 * it will work but it will have an impact on performance.
4018 * In practice, avpkt->data should have 4 byte alignment at minimum.
4020 * @note Codecs which have the CODEC_CAP_DELAY capability set have a delay
4021 * between input and output, these need to be fed with avpkt->data=NULL,
4022 * avpkt->size=0 at the end to return the remaining frames.
4024 * @param avctx the codec context
4025 * @param[out] picture The AVFrame in which the decoded video frame will be stored.
4026 * Use avcodec_alloc_frame to get an AVFrame, the codec will
4027 * allocate memory for the actual bitmap.
4028 * with default get/release_buffer(), the decoder frees/reuses the bitmap as it sees fit.
4029 * with overridden get/release_buffer() (needs CODEC_CAP_DR1) the user decides into what buffer the decoder
4030 * decodes and the decoder tells the user once it does not need the data anymore,
4031 * the user app can at this point free/reuse/keep the memory as it sees fit.
4033 * @param[in] avpkt The input AVpacket containing the input buffer.
4034 * You can create such packet with av_init_packet() and by then setting
4035 * data and size, some decoders might in addition need other fields like
4036 * flags&AV_PKT_FLAG_KEY. All decoders are designed to use the least
4038 * @param[in,out] got_picture_ptr Zero if no frame could be decompressed, otherwise, it is nonzero.
4039 * @return On error a negative value is returned, otherwise the number of bytes
4040 * used or zero if no frame could be decompressed.
4042 int avcodec_decode_video2(AVCodecContext *avctx, AVFrame *picture,
4043 int *got_picture_ptr,
4044 const AVPacket *avpkt);
4047 * Decode a subtitle message.
4048 * Return a negative value on error, otherwise return the number of bytes used.
4049 * If no subtitle could be decompressed, got_sub_ptr is zero.
4050 * Otherwise, the subtitle is stored in *sub.
4051 * Note that CODEC_CAP_DR1 is not available for subtitle codecs. This is for
4052 * simplicity, because the performance difference is expect to be negligible
4053 * and reusing a get_buffer written for video codecs would probably perform badly
4054 * due to a potentially very different allocation pattern.
4056 * @param avctx the codec context
4057 * @param[out] sub The AVSubtitle in which the decoded subtitle will be stored, must be
4058 freed with avsubtitle_free if *got_sub_ptr is set.
4059 * @param[in,out] got_sub_ptr Zero if no subtitle could be decompressed, otherwise, it is nonzero.
4060 * @param[in] avpkt The input AVPacket containing the input buffer.
4062 int avcodec_decode_subtitle2(AVCodecContext *avctx, AVSubtitle *sub,
4067 * @defgroup lavc_parsing Frame parsing
4071 typedef struct AVCodecParserContext {
4073 struct AVCodecParser *parser;
4074 int64_t frame_offset; /* offset of the current frame */
4075 int64_t cur_offset; /* current offset
4076 (incremented by each av_parser_parse()) */
4077 int64_t next_frame_offset; /* offset of the next frame */
4079 int pict_type; /* XXX: Put it back in AVCodecContext. */
4081 * This field is used for proper frame duration computation in lavf.
4082 * It signals, how much longer the frame duration of the current frame
4083 * is compared to normal frame duration.
4085 * frame_duration = (1 + repeat_pict) * time_base
4087 * It is used by codecs like H.264 to display telecined material.
4089 int repeat_pict; /* XXX: Put it back in AVCodecContext. */
4090 int64_t pts; /* pts of the current frame */
4091 int64_t dts; /* dts of the current frame */
4096 int fetch_timestamp;
4098 #define AV_PARSER_PTS_NB 4
4099 int cur_frame_start_index;
4100 int64_t cur_frame_offset[AV_PARSER_PTS_NB];
4101 int64_t cur_frame_pts[AV_PARSER_PTS_NB];
4102 int64_t cur_frame_dts[AV_PARSER_PTS_NB];
4105 #define PARSER_FLAG_COMPLETE_FRAMES 0x0001
4106 #define PARSER_FLAG_ONCE 0x0002
4107 /// Set if the parser has a valid file offset
4108 #define PARSER_FLAG_FETCHED_OFFSET 0x0004
4109 #define PARSER_FLAG_USE_CODEC_TS 0x1000
4111 int64_t offset; ///< byte offset from starting packet start
4112 int64_t cur_frame_end[AV_PARSER_PTS_NB];
4115 * Set by parser to 1 for key frames and 0 for non-key frames.
4116 * It is initialized to -1, so if the parser doesn't set this flag,
4117 * old-style fallback using AV_PICTURE_TYPE_I picture type as key frames
4123 * Time difference in stream time base units from the pts of this
4124 * packet to the point at which the output from the decoder has converged
4125 * independent from the availability of previous frames. That is, the
4126 * frames are virtually identical no matter if decoding started from
4127 * the very first frame or from this keyframe.
4128 * Is AV_NOPTS_VALUE if unknown.
4129 * This field is not the display duration of the current frame.
4130 * This field has no meaning if the packet does not have AV_PKT_FLAG_KEY
4133 * The purpose of this field is to allow seeking in streams that have no
4134 * keyframes in the conventional sense. It corresponds to the
4135 * recovery point SEI in H.264 and match_time_delta in NUT. It is also
4136 * essential for some types of subtitle streams to ensure that all
4137 * subtitles are correctly displayed after seeking.
4139 int64_t convergence_duration;
4141 // Timestamp generation support:
4143 * Synchronization point for start of timestamp generation.
4145 * Set to >0 for sync point, 0 for no sync point and <0 for undefined
4148 * For example, this corresponds to presence of H.264 buffering period
4154 * Offset of the current timestamp against last timestamp sync point in
4155 * units of AVCodecContext.time_base.
4157 * Set to INT_MIN when dts_sync_point unused. Otherwise, it must
4158 * contain a valid timestamp offset.
4160 * Note that the timestamp of sync point has usually a nonzero
4161 * dts_ref_dts_delta, which refers to the previous sync point. Offset of
4162 * the next frame after timestamp sync point will be usually 1.
4164 * For example, this corresponds to H.264 cpb_removal_delay.
4166 int dts_ref_dts_delta;
4169 * Presentation delay of current frame in units of AVCodecContext.time_base.
4171 * Set to INT_MIN when dts_sync_point unused. Otherwise, it must
4172 * contain valid non-negative timestamp delta (presentation time of a frame
4173 * must not lie in the past).
4175 * This delay represents the difference between decoding and presentation
4176 * time of the frame.
4178 * For example, this corresponds to H.264 dpb_output_delay.
4183 * Position of the packet in file.
4185 * Analogous to cur_frame_pts/dts
4187 int64_t cur_frame_pos[AV_PARSER_PTS_NB];
4190 * Byte position of currently parsed frame in stream.
4195 * Previous frame byte position.
4200 * Duration of the current frame.
4201 * For audio, this is in units of 1 / AVCodecContext.sample_rate.
4202 * For all other types, this is in units of AVCodecContext.time_base.
4205 } AVCodecParserContext;
4207 typedef struct AVCodecParser {
4208 int codec_ids[5]; /* several codec IDs are permitted */
4210 int (*parser_init)(AVCodecParserContext *s);
4211 int (*parser_parse)(AVCodecParserContext *s,
4212 AVCodecContext *avctx,
4213 const uint8_t **poutbuf, int *poutbuf_size,
4214 const uint8_t *buf, int buf_size);
4215 void (*parser_close)(AVCodecParserContext *s);
4216 int (*split)(AVCodecContext *avctx, const uint8_t *buf, int buf_size);
4217 struct AVCodecParser *next;
4220 AVCodecParser *av_parser_next(AVCodecParser *c);
4222 void av_register_codec_parser(AVCodecParser *parser);
4223 AVCodecParserContext *av_parser_init(int codec_id);
4228 * @param s parser context.
4229 * @param avctx codec context.
4230 * @param poutbuf set to pointer to parsed buffer or NULL if not yet finished.
4231 * @param poutbuf_size set to size of parsed buffer or zero if not yet finished.
4232 * @param buf input buffer.
4233 * @param buf_size input length, to signal EOF, this should be 0 (so that the last frame can be output).
4234 * @param pts input presentation timestamp.
4235 * @param dts input decoding timestamp.
4236 * @param pos input byte position in stream.
4237 * @return the number of bytes of the input bitstream used.
4242 * len = av_parser_parse2(myparser, AVCodecContext, &data, &size,
4249 * decode_frame(data, size);
4253 int av_parser_parse2(AVCodecParserContext *s,
4254 AVCodecContext *avctx,
4255 uint8_t **poutbuf, int *poutbuf_size,
4256 const uint8_t *buf, int buf_size,
4257 int64_t pts, int64_t dts,
4261 * @return 0 if the output buffer is a subset of the input, 1 if it is allocated and must be freed
4262 * @deprecated use AVBitstreamFilter
4264 int av_parser_change(AVCodecParserContext *s,
4265 AVCodecContext *avctx,
4266 uint8_t **poutbuf, int *poutbuf_size,
4267 const uint8_t *buf, int buf_size, int keyframe);
4268 void av_parser_close(AVCodecParserContext *s);
4276 * @addtogroup lavc_encoding
4281 * Find a registered encoder with a matching codec ID.
4283 * @param id AVCodecID of the requested encoder
4284 * @return An encoder if one was found, NULL otherwise.
4286 AVCodec *avcodec_find_encoder(enum AVCodecID id);
4289 * Find a registered encoder with the specified name.
4291 * @param name name of the requested encoder
4292 * @return An encoder if one was found, NULL otherwise.
4294 AVCodec *avcodec_find_encoder_by_name(const char *name);
4296 #if FF_API_OLD_ENCODE_AUDIO
4298 * Encode an audio frame from samples into buf.
4300 * @deprecated Use avcodec_encode_audio2 instead.
4302 * @note The output buffer should be at least FF_MIN_BUFFER_SIZE bytes large.
4303 * However, for codecs with avctx->frame_size equal to 0 (e.g. PCM) the user
4304 * will know how much space is needed because it depends on the value passed
4305 * in buf_size as described below. In that case a lower value can be used.
4307 * @param avctx the codec context
4308 * @param[out] buf the output buffer
4309 * @param[in] buf_size the output buffer size
4310 * @param[in] samples the input buffer containing the samples
4311 * The number of samples read from this buffer is frame_size*channels,
4312 * both of which are defined in avctx.
4313 * For codecs which have avctx->frame_size equal to 0 (e.g. PCM) the number of
4314 * samples read from samples is equal to:
4315 * buf_size * 8 / (avctx->channels * av_get_bits_per_sample(avctx->codec_id))
4316 * This also implies that av_get_bits_per_sample() must not return 0 for these
4318 * @return On error a negative value is returned, on success zero or the number
4319 * of bytes used to encode the data read from the input buffer.
4321 int attribute_deprecated avcodec_encode_audio(AVCodecContext *avctx,
4322 uint8_t *buf, int buf_size,
4323 const short *samples);
4327 * Encode a frame of audio.
4329 * Takes input samples from frame and writes the next output packet, if
4330 * available, to avpkt. The output packet does not necessarily contain data for
4331 * the most recent frame, as encoders can delay, split, and combine input frames
4332 * internally as needed.
4334 * @param avctx codec context
4335 * @param avpkt output AVPacket.
4336 * The user can supply an output buffer by setting
4337 * avpkt->data and avpkt->size prior to calling the
4338 * function, but if the size of the user-provided data is not
4339 * large enough, encoding will fail. If avpkt->data and
4340 * avpkt->size are set, avpkt->destruct must also be set. All
4341 * other AVPacket fields will be reset by the encoder using
4342 * av_init_packet(). If avpkt->data is NULL, the encoder will
4343 * allocate it. The encoder will set avpkt->size to the size
4344 * of the output packet.
4346 * If this function fails or produces no output, avpkt will be
4347 * freed using av_free_packet() (i.e. avpkt->destruct will be
4348 * called to free the user supplied buffer).
4349 * @param[in] frame AVFrame containing the raw audio data to be encoded.
4350 * May be NULL when flushing an encoder that has the
4351 * CODEC_CAP_DELAY capability set.
4352 * If CODEC_CAP_VARIABLE_FRAME_SIZE is set, then each frame
4353 * can have any number of samples.
4354 * If it is not set, frame->nb_samples must be equal to
4355 * avctx->frame_size for all frames except the last.
4356 * The final frame may be smaller than avctx->frame_size.
4357 * @param[out] got_packet_ptr This field is set to 1 by libavcodec if the
4358 * output packet is non-empty, and to 0 if it is
4359 * empty. If the function returns an error, the
4360 * packet can be assumed to be invalid, and the
4361 * value of got_packet_ptr is undefined and should
4363 * @return 0 on success, negative error code on failure
4365 int avcodec_encode_audio2(AVCodecContext *avctx, AVPacket *avpkt,
4366 const AVFrame *frame, int *got_packet_ptr);
4368 #if FF_API_OLD_ENCODE_VIDEO
4370 * @deprecated use avcodec_encode_video2() instead.
4372 * Encode a video frame from pict into buf.
4373 * The input picture should be
4374 * stored using a specific format, namely avctx.pix_fmt.
4376 * @param avctx the codec context
4377 * @param[out] buf the output buffer for the bitstream of encoded frame
4378 * @param[in] buf_size the size of the output buffer in bytes
4379 * @param[in] pict the input picture to encode
4380 * @return On error a negative value is returned, on success zero or the number
4381 * of bytes used from the output buffer.
4383 attribute_deprecated
4384 int avcodec_encode_video(AVCodecContext *avctx, uint8_t *buf, int buf_size,
4385 const AVFrame *pict);
4389 * Encode a frame of video.
4391 * Takes input raw video data from frame and writes the next output packet, if
4392 * available, to avpkt. The output packet does not necessarily contain data for
4393 * the most recent frame, as encoders can delay and reorder input frames
4394 * internally as needed.
4396 * @param avctx codec context
4397 * @param avpkt output AVPacket.
4398 * The user can supply an output buffer by setting
4399 * avpkt->data and avpkt->size prior to calling the
4400 * function, but if the size of the user-provided data is not
4401 * large enough, encoding will fail. All other AVPacket fields
4402 * will be reset by the encoder using av_init_packet(). If
4403 * avpkt->data is NULL, the encoder will allocate it.
4404 * The encoder will set avpkt->size to the size of the
4405 * output packet. The returned data (if any) belongs to the
4406 * caller, he is responsible for freeing it.
4408 * If this function fails or produces no output, avpkt will be
4409 * freed using av_free_packet() (i.e. avpkt->destruct will be
4410 * called to free the user supplied buffer).
4411 * @param[in] frame AVFrame containing the raw video data to be encoded.
4412 * May be NULL when flushing an encoder that has the
4413 * CODEC_CAP_DELAY capability set.
4414 * @param[out] got_packet_ptr This field is set to 1 by libavcodec if the
4415 * output packet is non-empty, and to 0 if it is
4416 * empty. If the function returns an error, the
4417 * packet can be assumed to be invalid, and the
4418 * value of got_packet_ptr is undefined and should
4420 * @return 0 on success, negative error code on failure
4422 int avcodec_encode_video2(AVCodecContext *avctx, AVPacket *avpkt,
4423 const AVFrame *frame, int *got_packet_ptr);
4425 int avcodec_encode_subtitle(AVCodecContext *avctx, uint8_t *buf, int buf_size,
4426 const AVSubtitle *sub);
4433 #if FF_API_AVCODEC_RESAMPLE
4435 * @defgroup lavc_resample Audio resampling
4437 * @deprecated use libswresample instead
4441 struct ReSampleContext;
4442 struct AVResampleContext;
4444 typedef struct ReSampleContext ReSampleContext;
4447 * Initialize audio resampling context.
4449 * @param output_channels number of output channels
4450 * @param input_channels number of input channels
4451 * @param output_rate output sample rate
4452 * @param input_rate input sample rate
4453 * @param sample_fmt_out requested output sample format
4454 * @param sample_fmt_in input sample format
4455 * @param filter_length length of each FIR filter in the filterbank relative to the cutoff frequency
4456 * @param log2_phase_count log2 of the number of entries in the polyphase filterbank
4457 * @param linear if 1 then the used FIR filter will be linearly interpolated
4458 between the 2 closest, if 0 the closest will be used
4459 * @param cutoff cutoff frequency, 1.0 corresponds to half the output sampling rate
4460 * @return allocated ReSampleContext, NULL if error occurred
4462 attribute_deprecated
4463 ReSampleContext *av_audio_resample_init(int output_channels, int input_channels,
4464 int output_rate, int input_rate,
4465 enum AVSampleFormat sample_fmt_out,
4466 enum AVSampleFormat sample_fmt_in,
4467 int filter_length, int log2_phase_count,
4468 int linear, double cutoff);
4470 attribute_deprecated
4471 int audio_resample(ReSampleContext *s, short *output, short *input, int nb_samples);
4474 * Free resample context.
4476 * @param s a non-NULL pointer to a resample context previously
4477 * created with av_audio_resample_init()
4479 attribute_deprecated
4480 void audio_resample_close(ReSampleContext *s);
4484 * Initialize an audio resampler.
4485 * Note, if either rate is not an integer then simply scale both rates up so they are.
4486 * @param filter_length length of each FIR filter in the filterbank relative to the cutoff freq
4487 * @param log2_phase_count log2 of the number of entries in the polyphase filterbank
4488 * @param linear If 1 then the used FIR filter will be linearly interpolated
4489 between the 2 closest, if 0 the closest will be used
4490 * @param cutoff cutoff frequency, 1.0 corresponds to half the output sampling rate
4492 attribute_deprecated
4493 struct AVResampleContext *av_resample_init(int out_rate, int in_rate, int filter_length, int log2_phase_count, int linear, double cutoff);
4496 * Resample an array of samples using a previously configured context.
4497 * @param src an array of unconsumed samples
4498 * @param consumed the number of samples of src which have been consumed are returned here
4499 * @param src_size the number of unconsumed samples available
4500 * @param dst_size the amount of space in samples available in dst
4501 * @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.
4502 * @return the number of samples written in dst or -1 if an error occurred
4504 attribute_deprecated
4505 int av_resample(struct AVResampleContext *c, short *dst, short *src, int *consumed, int src_size, int dst_size, int update_ctx);
4509 * Compensate samplerate/timestamp drift. The compensation is done by changing
4510 * the resampler parameters, so no audible clicks or similar distortions occur
4511 * @param compensation_distance distance in output samples over which the compensation should be performed
4512 * @param sample_delta number of output samples which should be output less
4514 * example: av_resample_compensate(c, 10, 500)
4515 * here instead of 510 samples only 500 samples would be output
4517 * note, due to rounding the actual compensation might be slightly different,
4518 * especially if the compensation_distance is large and the in_rate used during init is small
4520 attribute_deprecated
4521 void av_resample_compensate(struct AVResampleContext *c, int sample_delta, int compensation_distance);
4522 attribute_deprecated
4523 void av_resample_close(struct AVResampleContext *c);
4531 * @addtogroup lavc_picture
4536 * Allocate memory for a picture. Call avpicture_free() to free it.
4538 * @see avpicture_fill()
4540 * @param picture the picture to be filled in
4541 * @param pix_fmt the format of the picture
4542 * @param width the width of the picture
4543 * @param height the height of the picture
4544 * @return zero if successful, a negative value if not
4546 int avpicture_alloc(AVPicture *picture, enum AVPixelFormat pix_fmt, int width, int height);
4549 * Free a picture previously allocated by avpicture_alloc().
4550 * The data buffer used by the AVPicture is freed, but the AVPicture structure
4553 * @param picture the AVPicture to be freed
4555 void avpicture_free(AVPicture *picture);
4558 * Fill in the AVPicture fields, always assume a linesize alignment of
4561 * @see av_image_fill_arrays()
4563 int avpicture_fill(AVPicture *picture, const uint8_t *ptr,
4564 enum AVPixelFormat pix_fmt, int width, int height);
4567 * Copy pixel data from an AVPicture into a buffer, always assume a
4568 * linesize alignment of 1.
4570 * @see av_image_copy_to_buffer()
4572 int avpicture_layout(const AVPicture* src, enum AVPixelFormat pix_fmt,
4573 int width, int height,
4574 unsigned char *dest, int dest_size);
4577 * Calculate the size in bytes that a picture of the given width and height
4578 * would occupy if stored in the given picture format.
4579 * Always assume a linesize alignment of 1.
4581 * @see av_image_get_buffer_size().
4583 int avpicture_get_size(enum AVPixelFormat pix_fmt, int width, int height);
4586 * deinterlace - if not supported return -1
4588 int avpicture_deinterlace(AVPicture *dst, const AVPicture *src,
4589 enum AVPixelFormat pix_fmt, int width, int height);
4591 * Copy image src to dst. Wraps av_image_copy().
4593 void av_picture_copy(AVPicture *dst, const AVPicture *src,
4594 enum AVPixelFormat pix_fmt, int width, int height);
4597 * Crop image top and left side.
4599 int av_picture_crop(AVPicture *dst, const AVPicture *src,
4600 enum AVPixelFormat pix_fmt, int top_band, int left_band);
4605 int av_picture_pad(AVPicture *dst, const AVPicture *src, int height, int width, enum AVPixelFormat pix_fmt,
4606 int padtop, int padbottom, int padleft, int padright, int *color);
4613 * @defgroup lavc_misc Utility functions
4616 * Miscellaneous utility functions related to both encoding and decoding
4622 * @defgroup lavc_misc_pixfmt Pixel formats
4624 * Functions for working with pixel formats.
4629 * Utility function to access log2_chroma_w log2_chroma_h from
4630 * the pixel format AVPixFmtDescriptor.
4632 * This function asserts that pix_fmt is valid. See av_pix_fmt_get_chroma_sub_sample
4633 * for one that returns a failure code and continues in case of invalid
4636 * @param[in] pix_fmt the pixel format
4637 * @param[out] h_shift store log2_chroma_h
4638 * @param[out] v_shift store log2_chroma_w
4640 * @see av_pix_fmt_get_chroma_sub_sample
4643 void avcodec_get_chroma_sub_sample(enum AVPixelFormat pix_fmt, int *h_shift, int *v_shift);
4646 * Return a value representing the fourCC code associated to the
4647 * pixel format pix_fmt, or 0 if no associated fourCC code can be
4650 unsigned int avcodec_pix_fmt_to_codec_tag(enum AVPixelFormat pix_fmt);
4652 #define FF_LOSS_RESOLUTION 0x0001 /**< loss due to resolution change */
4653 #define FF_LOSS_DEPTH 0x0002 /**< loss due to color depth change */
4654 #define FF_LOSS_COLORSPACE 0x0004 /**< loss due to color space conversion */
4655 #define FF_LOSS_ALPHA 0x0008 /**< loss of alpha bits */
4656 #define FF_LOSS_COLORQUANT 0x0010 /**< loss due to color quantization */
4657 #define FF_LOSS_CHROMA 0x0020 /**< loss of chroma (e.g. RGB to gray conversion) */
4660 * Compute what kind of losses will occur when converting from one specific
4661 * pixel format to another.
4662 * When converting from one pixel format to another, information loss may occur.
4663 * For example, when converting from RGB24 to GRAY, the color information will
4664 * be lost. Similarly, other losses occur when converting from some formats to
4665 * other formats. These losses can involve loss of chroma, but also loss of
4666 * resolution, loss of color depth, loss due to the color space conversion, loss
4667 * of the alpha bits or loss due to color quantization.
4668 * avcodec_get_fix_fmt_loss() informs you about the various types of losses
4669 * which will occur when converting from one pixel format to another.
4671 * @param[in] dst_pix_fmt destination pixel format
4672 * @param[in] src_pix_fmt source pixel format
4673 * @param[in] has_alpha Whether the source pixel format alpha channel is used.
4674 * @return Combination of flags informing you what kind of losses will occur
4675 * (maximum loss for an invalid dst_pix_fmt).
4677 int avcodec_get_pix_fmt_loss(enum AVPixelFormat dst_pix_fmt, enum AVPixelFormat src_pix_fmt,
4680 #if FF_API_FIND_BEST_PIX_FMT
4682 * @deprecated use avcodec_find_best_pix_fmt_of_2() instead.
4684 * Find the best pixel format to convert to given a certain source pixel
4685 * format. When converting from one pixel format to another, information loss
4686 * may occur. For example, when converting from RGB24 to GRAY, the color
4687 * information will be lost. Similarly, other losses occur when converting from
4688 * some formats to other formats. avcodec_find_best_pix_fmt() searches which of
4689 * the given pixel formats should be used to suffer the least amount of loss.
4690 * The pixel formats from which it chooses one, are determined by the
4691 * pix_fmt_mask parameter.
4693 * Note, only the first 64 pixel formats will fit in pix_fmt_mask.
4696 * src_pix_fmt = AV_PIX_FMT_YUV420P;
4697 * pix_fmt_mask = (1 << AV_PIX_FMT_YUV422P) | (1 << AV_PIX_FMT_RGB24);
4698 * dst_pix_fmt = avcodec_find_best_pix_fmt(pix_fmt_mask, src_pix_fmt, alpha, &loss);
4701 * @param[in] pix_fmt_mask bitmask determining which pixel format to choose from
4702 * @param[in] src_pix_fmt source pixel format
4703 * @param[in] has_alpha Whether the source pixel format alpha channel is used.
4704 * @param[out] loss_ptr Combination of flags informing you what kind of losses will occur.
4705 * @return The best pixel format to convert to or -1 if none was found.
4707 attribute_deprecated
4708 enum AVPixelFormat avcodec_find_best_pix_fmt(int64_t pix_fmt_mask, enum AVPixelFormat src_pix_fmt,
4709 int has_alpha, int *loss_ptr);
4710 #endif /* FF_API_FIND_BEST_PIX_FMT */
4713 * Find the best pixel format to convert to given a certain source pixel
4714 * format. When converting from one pixel format to another, information loss
4715 * may occur. For example, when converting from RGB24 to GRAY, the color
4716 * information will be lost. Similarly, other losses occur when converting from
4717 * some formats to other formats. avcodec_find_best_pix_fmt_of_2() searches which of
4718 * the given pixel formats should be used to suffer the least amount of loss.
4719 * The pixel formats from which it chooses one, are determined by the
4720 * pix_fmt_list parameter.
4723 * @param[in] pix_fmt_list AV_PIX_FMT_NONE terminated array of pixel formats to choose from
4724 * @param[in] src_pix_fmt source pixel format
4725 * @param[in] has_alpha Whether the source pixel format alpha channel is used.
4726 * @param[out] loss_ptr Combination of flags informing you what kind of losses will occur.
4727 * @return The best pixel format to convert to or -1 if none was found.
4729 enum AVPixelFormat avcodec_find_best_pix_fmt_of_list(enum AVPixelFormat *pix_fmt_list,
4730 enum AVPixelFormat src_pix_fmt,
4731 int has_alpha, int *loss_ptr);
4734 * Find the best pixel format to convert to given a certain source pixel
4735 * format and a selection of two destination pixel formats. When converting from
4736 * one pixel format to another, information loss may occur. For example, when converting
4737 * from RGB24 to GRAY, the color information will be lost. Similarly, other losses occur when
4738 * converting from some formats to other formats. avcodec_find_best_pix_fmt_of_2() selects which of
4739 * the given pixel formats should be used to suffer the least amount of loss.
4741 * If one of the destination formats is AV_PIX_FMT_NONE the other pixel format (if valid) will be
4745 * src_pix_fmt = AV_PIX_FMT_YUV420P;
4746 * dst_pix_fmt1= AV_PIX_FMT_RGB24;
4747 * dst_pix_fmt2= AV_PIX_FMT_GRAY8;
4748 * dst_pix_fmt3= AV_PIX_FMT_RGB8;
4749 * loss= FF_LOSS_CHROMA; // don't care about chroma loss, so chroma loss will be ignored.
4750 * dst_pix_fmt = avcodec_find_best_pix_fmt_of_2(dst_pix_fmt1, dst_pix_fmt2, src_pix_fmt, alpha, &loss);
4751 * dst_pix_fmt = avcodec_find_best_pix_fmt_of_2(dst_pix_fmt, dst_pix_fmt3, src_pix_fmt, alpha, &loss);
4754 * @param[in] dst_pix_fmt1 One of the two destination pixel formats to choose from
4755 * @param[in] dst_pix_fmt2 The other of the two destination pixel formats to choose from
4756 * @param[in] src_pix_fmt Source pixel format
4757 * @param[in] has_alpha Whether the source pixel format alpha channel is used.
4758 * @param[in, out] loss_ptr Combination of loss flags. In: selects which of the losses to ignore, i.e.
4759 * NULL or value of zero means we care about all losses. Out: the loss
4760 * that occurs when converting from src to selected dst pixel format.
4761 * @return The best pixel format to convert to or -1 if none was found.
4763 enum AVPixelFormat avcodec_find_best_pix_fmt_of_2(enum AVPixelFormat dst_pix_fmt1, enum AVPixelFormat dst_pix_fmt2,
4764 enum AVPixelFormat src_pix_fmt, int has_alpha, int *loss_ptr);
4766 attribute_deprecated
4767 #if AV_HAVE_INCOMPATIBLE_FORK_ABI
4768 enum AVPixelFormat avcodec_find_best_pix_fmt2(enum AVPixelFormat *pix_fmt_list,
4769 enum AVPixelFormat src_pix_fmt,
4770 int has_alpha, int *loss_ptr);
4772 enum AVPixelFormat avcodec_find_best_pix_fmt2(enum AVPixelFormat dst_pix_fmt1, enum AVPixelFormat dst_pix_fmt2,
4773 enum AVPixelFormat src_pix_fmt, int has_alpha, int *loss_ptr);
4777 enum AVPixelFormat avcodec_default_get_format(struct AVCodecContext *s, const enum AVPixelFormat * fmt);
4783 void avcodec_set_dimensions(AVCodecContext *s, int width, int height);
4786 * Put a string representing the codec tag codec_tag in buf.
4788 * @param buf_size size in bytes of buf
4789 * @return the length of the string that would have been generated if
4790 * enough space had been available, excluding the trailing null
4792 size_t av_get_codec_tag_string(char *buf, size_t buf_size, unsigned int codec_tag);
4794 void avcodec_string(char *buf, int buf_size, AVCodecContext *enc, int encode);
4797 * Return a name for the specified profile, if available.
4799 * @param codec the codec that is searched for the given profile
4800 * @param profile the profile value for which a name is requested
4801 * @return A name for the profile if found, NULL otherwise.
4803 const char *av_get_profile_name(const AVCodec *codec, int profile);
4805 int avcodec_default_execute(AVCodecContext *c, int (*func)(AVCodecContext *c2, void *arg2),void *arg, int *ret, int count, int size);
4806 int avcodec_default_execute2(AVCodecContext *c, int (*func)(AVCodecContext *c2, void *arg2, int, int),void *arg, int *ret, int count);
4807 //FIXME func typedef
4810 * Fill AVFrame audio data and linesize pointers.
4812 * The buffer buf must be a preallocated buffer with a size big enough
4813 * to contain the specified samples amount. The filled AVFrame data
4814 * pointers will point to this buffer.
4816 * AVFrame extended_data channel pointers are allocated if necessary for
4819 * @param frame the AVFrame
4820 * frame->nb_samples must be set prior to calling the
4821 * function. This function fills in frame->data,
4822 * frame->extended_data, frame->linesize[0].
4823 * @param nb_channels channel count
4824 * @param sample_fmt sample format
4825 * @param buf buffer to use for frame data
4826 * @param buf_size size of buffer
4827 * @param align plane size sample alignment (0 = default)
4828 * @return >=0 on success, negative error code on failure
4829 * @todo return the size in bytes required to store the samples in
4830 * case of success, at the next libavutil bump
4832 int avcodec_fill_audio_frame(AVFrame *frame, int nb_channels,
4833 enum AVSampleFormat sample_fmt, const uint8_t *buf,
4834 int buf_size, int align);
4837 * Flush buffers, should be called when seeking or when switching to a different stream.
4839 void avcodec_flush_buffers(AVCodecContext *avctx);
4841 void avcodec_default_free_buffers(AVCodecContext *s);
4844 * Return codec bits per sample.
4846 * @param[in] codec_id the codec
4847 * @return Number of bits per sample or zero if unknown for the given codec.
4849 int av_get_bits_per_sample(enum AVCodecID codec_id);
4852 * Return the PCM codec associated with a sample format.
4853 * @param be endianness, 0 for little, 1 for big,
4854 * -1 (or anything else) for native
4855 * @return AV_CODEC_ID_PCM_* or AV_CODEC_ID_NONE
4857 enum AVCodecID av_get_pcm_codec(enum AVSampleFormat fmt, int be);
4860 * Return codec bits per sample.
4861 * Only return non-zero if the bits per sample is exactly correct, not an
4864 * @param[in] codec_id the codec
4865 * @return Number of bits per sample or zero if unknown for the given codec.
4867 int av_get_exact_bits_per_sample(enum AVCodecID codec_id);
4870 * Return audio frame duration.
4872 * @param avctx codec context
4873 * @param frame_bytes size of the frame, or 0 if unknown
4874 * @return frame duration, in samples, if known. 0 if not able to
4877 int av_get_audio_frame_duration(AVCodecContext *avctx, int frame_bytes);
4880 typedef struct AVBitStreamFilterContext {
4882 struct AVBitStreamFilter *filter;
4883 AVCodecParserContext *parser;
4884 struct AVBitStreamFilterContext *next;
4885 } AVBitStreamFilterContext;
4888 typedef struct AVBitStreamFilter {
4891 int (*filter)(AVBitStreamFilterContext *bsfc,
4892 AVCodecContext *avctx, const char *args,
4893 uint8_t **poutbuf, int *poutbuf_size,
4894 const uint8_t *buf, int buf_size, int keyframe);
4895 void (*close)(AVBitStreamFilterContext *bsfc);
4896 struct AVBitStreamFilter *next;
4897 } AVBitStreamFilter;
4899 void av_register_bitstream_filter(AVBitStreamFilter *bsf);
4900 AVBitStreamFilterContext *av_bitstream_filter_init(const char *name);
4901 int av_bitstream_filter_filter(AVBitStreamFilterContext *bsfc,
4902 AVCodecContext *avctx, const char *args,
4903 uint8_t **poutbuf, int *poutbuf_size,
4904 const uint8_t *buf, int buf_size, int keyframe);
4905 void av_bitstream_filter_close(AVBitStreamFilterContext *bsf);
4907 AVBitStreamFilter *av_bitstream_filter_next(AVBitStreamFilter *f);
4912 * Reallocate the given block if it is not large enough, otherwise do nothing.
4916 void *av_fast_realloc(void *ptr, unsigned int *size, size_t min_size);
4919 * Allocate a buffer, reusing the given one if large enough.
4921 * Contrary to av_fast_realloc the current buffer contents might not be
4922 * preserved and on error the old buffer is freed, thus no special
4923 * handling to avoid memleaks is necessary.
4925 * @param ptr pointer to pointer to already allocated buffer, overwritten with pointer to new buffer
4926 * @param size size of the buffer *ptr points to
4927 * @param min_size minimum size of *ptr buffer after returning, *ptr will be NULL and
4928 * *size 0 if an error occurred.
4930 void av_fast_malloc(void *ptr, unsigned int *size, size_t min_size);
4933 * Same behaviour av_fast_malloc but the buffer has additional
4934 * FF_INPUT_BUFFER_PADDING_SIZE at the end which will will always be 0.
4936 * In addition the whole buffer will initially and after resizes
4937 * be 0-initialized so that no uninitialized data will ever appear.
4939 void av_fast_padded_malloc(void *ptr, unsigned int *size, size_t min_size);
4942 * Same behaviour av_fast_padded_malloc except that buffer will always
4943 * be 0-initialized after call.
4945 void av_fast_padded_mallocz(void *ptr, unsigned int *size, size_t min_size);
4948 * Encode extradata length to a buffer. Used by xiph codecs.
4950 * @param s buffer to write to; must be at least (v/255+1) bytes long
4951 * @param v size of extradata in bytes
4952 * @return number of bytes written to the buffer.
4954 unsigned int av_xiphlacing(unsigned char *s, unsigned int v);
4957 * Log a generic warning message about a missing feature. This function is
4958 * intended to be used internally by FFmpeg (libavcodec, libavformat, etc.)
4959 * only, and would normally not be used by applications.
4960 * @param[in] avc a pointer to an arbitrary struct of which the first field is
4961 * a pointer to an AVClass struct
4962 * @param[in] feature string containing the name of the missing feature
4963 * @param[in] want_sample indicates if samples are wanted which exhibit this feature.
4964 * If want_sample is non-zero, additional verbage will be added to the log
4965 * message which tells the user how to report samples to the development
4968 void av_log_missing_feature(void *avc, const char *feature, int want_sample);
4971 * Log a generic warning message asking for a sample. This function is
4972 * intended to be used internally by FFmpeg (libavcodec, libavformat, etc.)
4973 * only, and would normally not be used by applications.
4974 * @param[in] avc a pointer to an arbitrary struct of which the first field is
4975 * a pointer to an AVClass struct
4976 * @param[in] msg string containing an optional message, or NULL if no message
4978 void av_log_ask_for_sample(void *avc, const char *msg, ...) av_printf_format(2, 3);
4981 * Register the hardware accelerator hwaccel.
4983 void av_register_hwaccel(AVHWAccel *hwaccel);
4986 * If hwaccel is NULL, returns the first registered hardware accelerator,
4987 * if hwaccel is non-NULL, returns the next registered hardware accelerator
4988 * after hwaccel, or NULL if hwaccel is the last one.
4990 AVHWAccel *av_hwaccel_next(AVHWAccel *hwaccel);
4994 * Lock operation used by lockmgr
4997 AV_LOCK_CREATE, ///< Create a mutex
4998 AV_LOCK_OBTAIN, ///< Lock the mutex
4999 AV_LOCK_RELEASE, ///< Unlock the mutex
5000 AV_LOCK_DESTROY, ///< Free mutex resources
5004 * Register a user provided lock manager supporting the operations
5005 * specified by AVLockOp. mutex points to a (void *) where the
5006 * lockmgr should store/get a pointer to a user allocated mutex. It's
5007 * NULL upon AV_LOCK_CREATE and != NULL for all other ops.
5009 * @param cb User defined callback. Note: FFmpeg may invoke calls to this
5010 * callback during the call to av_lockmgr_register().
5011 * Thus, the application must be prepared to handle that.
5012 * If cb is set to NULL the lockmgr will be unregistered.
5013 * Also note that during unregistration the previously registered
5014 * lockmgr callback may also be invoked.
5016 int av_lockmgr_register(int (*cb)(void **mutex, enum AVLockOp op));
5019 * Get the type of the given codec.
5021 enum AVMediaType avcodec_get_type(enum AVCodecID codec_id);
5024 * Get the name of a codec.
5025 * @return a static string identifying the codec; never NULL
5027 const char *avcodec_get_name(enum AVCodecID id);
5030 * @return a positive value if s is open (i.e. avcodec_open2() was called on it
5031 * with no corresponding avcodec_close()), 0 otherwise.
5033 int avcodec_is_open(AVCodecContext *s);
5036 * @return a non-zero number if codec is an encoder, zero otherwise
5038 int av_codec_is_encoder(const AVCodec *codec);
5041 * @return a non-zero number if codec is a decoder, zero otherwise
5043 int av_codec_is_decoder(const AVCodec *codec);
5046 * @return descriptor for given codec ID or NULL if no descriptor exists.
5048 const AVCodecDescriptor *avcodec_descriptor_get(enum AVCodecID id);
5051 * Iterate over all codec descriptors known to libavcodec.
5053 * @param prev previous descriptor. NULL to get the first descriptor.
5055 * @return next descriptor or NULL after the last descriptor
5057 const AVCodecDescriptor *avcodec_descriptor_next(const AVCodecDescriptor *prev);
5060 * @return codec descriptor with the given name or NULL if no such descriptor
5063 const AVCodecDescriptor *avcodec_descriptor_get_by_name(const char *name);
5069 #endif /* AVCODEC_AVCODEC_H */