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
27 * Libavcodec external API header
31 #include "libavutil/samplefmt.h"
32 #include "libavutil/attributes.h"
33 #include "libavutil/avutil.h"
34 #include "libavutil/buffer.h"
35 #include "libavutil/cpu.h"
36 #include "libavutil/channel_layout.h"
37 #include "libavutil/dict.h"
38 #include "libavutil/frame.h"
39 #include "libavutil/log.h"
40 #include "libavutil/pixfmt.h"
41 #include "libavutil/rational.h"
46 * @defgroup libavc Encoding/Decoding Library
49 * @defgroup lavc_decoding Decoding
53 * @defgroup lavc_encoding Encoding
57 * @defgroup lavc_codec Codecs
59 * @defgroup lavc_codec_native Native Codecs
62 * @defgroup lavc_codec_wrappers External library wrappers
65 * @defgroup lavc_codec_hwaccel Hardware Accelerators bridge
69 * @defgroup lavc_internal Internal
77 * @defgroup lavc_core Core functions/structures.
80 * Basic definitions, functions for querying libavcodec capabilities,
81 * allocating core structures, etc.
87 * Identify the syntax and semantics of the bitstream.
88 * The principle is roughly:
89 * Two decoders with the same ID can decode the same streams.
90 * Two encoders with the same ID can encode compatible streams.
91 * There may be slight deviations from the principle due to implementation
94 * If you add a codec ID to this list, add it so that
95 * 1. no value of a existing codec ID changes (that would break ABI),
96 * 2. Give it a value which when taken as ASCII is recognized uniquely by a human as this specific codec.
97 * This ensures that 2 forks can independently add AVCodecIDs without producing conflicts.
99 * After adding new codec IDs, do not forget to add an entry to the codec
100 * descriptor list and bump libavcodec minor version.
106 AV_CODEC_ID_MPEG1VIDEO,
107 AV_CODEC_ID_MPEG2VIDEO, ///< preferred ID for MPEG-1/2 video decoding
109 AV_CODEC_ID_MPEG2VIDEO_XVMC,
110 #endif /* FF_API_XVMC */
121 AV_CODEC_ID_RAWVIDEO,
122 AV_CODEC_ID_MSMPEG4V1,
123 AV_CODEC_ID_MSMPEG4V2,
124 AV_CODEC_ID_MSMPEG4V3,
147 AV_CODEC_ID_INTERPLAY_VIDEO,
154 AV_CODEC_ID_MSVIDEO1,
159 AV_CODEC_ID_TRUEMOTION1,
160 AV_CODEC_ID_VMDVIDEO,
185 AV_CODEC_ID_TRUEMOTION2,
191 AV_CODEC_ID_SMACKVIDEO,
196 AV_CODEC_ID_JPEG2000,
202 AV_CODEC_ID_DSICINVIDEO,
203 AV_CODEC_ID_TIERTEXSEQVIDEO,
211 AV_CODEC_ID_BETHSOFTVID,
223 AV_CODEC_ID_ESCAPE124,
227 AV_CODEC_ID_MOTIONPIXELS,
239 AV_CODEC_ID_FLASHSV2,
240 AV_CODEC_ID_CDGRAPHICS,
243 AV_CODEC_ID_BINKVIDEO,
244 AV_CODEC_ID_IFF_ILBM,
245 AV_CODEC_ID_IFF_BYTERUN1,
251 AV_CODEC_ID_A64_MULTI,
252 AV_CODEC_ID_A64_MULTI5,
255 AV_CODEC_ID_LAGARITH,
259 AV_CODEC_ID_WMV3IMAGE,
260 AV_CODEC_ID_VC1IMAGE,
262 AV_CODEC_ID_BMV_VIDEO,
269 AV_CODEC_ID_ZEROCODEC,
278 AV_CODEC_ID_ESCAPE130_DEPRECATED,
279 AV_CODEC_ID_G2M_DEPRECATED,
280 AV_CODEC_ID_WEBP_DEPRECATED,
281 AV_CODEC_ID_HNM4_VIDEO,
282 AV_CODEC_ID_HEVC_DEPRECATED,
284 AV_CODEC_ID_ALIAS_PIX,
285 AV_CODEC_ID_BRENDER_PIX_DEPRECATED,
286 AV_CODEC_ID_PAF_VIDEO_DEPRECATED,
287 AV_CODEC_ID_EXR_DEPRECATED,
288 AV_CODEC_ID_VP7_DEPRECATED,
289 AV_CODEC_ID_SANM_DEPRECATED,
290 AV_CODEC_ID_SGIRLE_DEPRECATED,
291 AV_CODEC_ID_MVC1_DEPRECATED,
292 AV_CODEC_ID_MVC2_DEPRECATED,
297 AV_CODEC_ID_BRENDER_PIX= MKBETAG('B','P','I','X'),
298 AV_CODEC_ID_Y41P = MKBETAG('Y','4','1','P'),
299 AV_CODEC_ID_ESCAPE130 = MKBETAG('E','1','3','0'),
300 AV_CODEC_ID_EXR = MKBETAG('0','E','X','R'),
301 AV_CODEC_ID_AVRP = MKBETAG('A','V','R','P'),
303 AV_CODEC_ID_012V = MKBETAG('0','1','2','V'),
304 AV_CODEC_ID_G2M = MKBETAG( 0 ,'G','2','M'),
305 AV_CODEC_ID_AVUI = MKBETAG('A','V','U','I'),
306 AV_CODEC_ID_AYUV = MKBETAG('A','Y','U','V'),
307 AV_CODEC_ID_TARGA_Y216 = MKBETAG('T','2','1','6'),
308 AV_CODEC_ID_V308 = MKBETAG('V','3','0','8'),
309 AV_CODEC_ID_V408 = MKBETAG('V','4','0','8'),
310 AV_CODEC_ID_YUV4 = MKBETAG('Y','U','V','4'),
311 AV_CODEC_ID_SANM = MKBETAG('S','A','N','M'),
312 AV_CODEC_ID_PAF_VIDEO = MKBETAG('P','A','F','V'),
313 AV_CODEC_ID_AVRN = MKBETAG('A','V','R','n'),
314 AV_CODEC_ID_CPIA = MKBETAG('C','P','I','A'),
315 AV_CODEC_ID_XFACE = MKBETAG('X','F','A','C'),
316 AV_CODEC_ID_SGIRLE = MKBETAG('S','G','I','R'),
317 AV_CODEC_ID_MVC1 = MKBETAG('M','V','C','1'),
318 AV_CODEC_ID_MVC2 = MKBETAG('M','V','C','2'),
319 AV_CODEC_ID_SNOW = MKBETAG('S','N','O','W'),
320 AV_CODEC_ID_WEBP = MKBETAG('W','E','B','P'),
321 AV_CODEC_ID_SMVJPEG = MKBETAG('S','M','V','J'),
322 AV_CODEC_ID_HEVC = MKBETAG('H','2','6','5'),
323 #define AV_CODEC_ID_H265 AV_CODEC_ID_HEVC
324 AV_CODEC_ID_VP7 = MKBETAG('V','P','7','0'),
325 AV_CODEC_ID_APNG = MKBETAG('A','P','N','G'),
327 /* various PCM "codecs" */
328 AV_CODEC_ID_FIRST_AUDIO = 0x10000, ///< A dummy id pointing at the start of audio codecs
329 AV_CODEC_ID_PCM_S16LE = 0x10000,
330 AV_CODEC_ID_PCM_S16BE,
331 AV_CODEC_ID_PCM_U16LE,
332 AV_CODEC_ID_PCM_U16BE,
335 AV_CODEC_ID_PCM_MULAW,
336 AV_CODEC_ID_PCM_ALAW,
337 AV_CODEC_ID_PCM_S32LE,
338 AV_CODEC_ID_PCM_S32BE,
339 AV_CODEC_ID_PCM_U32LE,
340 AV_CODEC_ID_PCM_U32BE,
341 AV_CODEC_ID_PCM_S24LE,
342 AV_CODEC_ID_PCM_S24BE,
343 AV_CODEC_ID_PCM_U24LE,
344 AV_CODEC_ID_PCM_U24BE,
345 AV_CODEC_ID_PCM_S24DAUD,
346 AV_CODEC_ID_PCM_ZORK,
347 AV_CODEC_ID_PCM_S16LE_PLANAR,
349 AV_CODEC_ID_PCM_F32BE,
350 AV_CODEC_ID_PCM_F32LE,
351 AV_CODEC_ID_PCM_F64BE,
352 AV_CODEC_ID_PCM_F64LE,
353 AV_CODEC_ID_PCM_BLURAY,
356 AV_CODEC_ID_PCM_S8_PLANAR,
357 AV_CODEC_ID_PCM_S24LE_PLANAR_DEPRECATED,
358 AV_CODEC_ID_PCM_S32LE_PLANAR_DEPRECATED,
359 AV_CODEC_ID_PCM_S24LE_PLANAR = MKBETAG(24,'P','S','P'),
360 AV_CODEC_ID_PCM_S32LE_PLANAR = MKBETAG(32,'P','S','P'),
361 AV_CODEC_ID_PCM_S16BE_PLANAR = MKBETAG('P','S','P',16),
363 /* various ADPCM codecs */
364 AV_CODEC_ID_ADPCM_IMA_QT = 0x11000,
365 AV_CODEC_ID_ADPCM_IMA_WAV,
366 AV_CODEC_ID_ADPCM_IMA_DK3,
367 AV_CODEC_ID_ADPCM_IMA_DK4,
368 AV_CODEC_ID_ADPCM_IMA_WS,
369 AV_CODEC_ID_ADPCM_IMA_SMJPEG,
370 AV_CODEC_ID_ADPCM_MS,
371 AV_CODEC_ID_ADPCM_4XM,
372 AV_CODEC_ID_ADPCM_XA,
373 AV_CODEC_ID_ADPCM_ADX,
374 AV_CODEC_ID_ADPCM_EA,
375 AV_CODEC_ID_ADPCM_G726,
376 AV_CODEC_ID_ADPCM_CT,
377 AV_CODEC_ID_ADPCM_SWF,
378 AV_CODEC_ID_ADPCM_YAMAHA,
379 AV_CODEC_ID_ADPCM_SBPRO_4,
380 AV_CODEC_ID_ADPCM_SBPRO_3,
381 AV_CODEC_ID_ADPCM_SBPRO_2,
382 AV_CODEC_ID_ADPCM_THP,
383 AV_CODEC_ID_ADPCM_IMA_AMV,
384 AV_CODEC_ID_ADPCM_EA_R1,
385 AV_CODEC_ID_ADPCM_EA_R3,
386 AV_CODEC_ID_ADPCM_EA_R2,
387 AV_CODEC_ID_ADPCM_IMA_EA_SEAD,
388 AV_CODEC_ID_ADPCM_IMA_EA_EACS,
389 AV_CODEC_ID_ADPCM_EA_XAS,
390 AV_CODEC_ID_ADPCM_EA_MAXIS_XA,
391 AV_CODEC_ID_ADPCM_IMA_ISS,
392 AV_CODEC_ID_ADPCM_G722,
393 AV_CODEC_ID_ADPCM_IMA_APC,
394 AV_CODEC_ID_ADPCM_VIMA_DEPRECATED,
395 AV_CODEC_ID_ADPCM_VIMA = MKBETAG('V','I','M','A'),
396 #if FF_API_VIMA_DECODER
397 AV_CODEC_ID_VIMA = MKBETAG('V','I','M','A'),
399 AV_CODEC_ID_ADPCM_AFC = MKBETAG('A','F','C',' '),
400 AV_CODEC_ID_ADPCM_IMA_OKI = MKBETAG('O','K','I',' '),
401 AV_CODEC_ID_ADPCM_DTK = MKBETAG('D','T','K',' '),
402 AV_CODEC_ID_ADPCM_IMA_RAD = MKBETAG('R','A','D',' '),
403 AV_CODEC_ID_ADPCM_G726LE = MKBETAG('6','2','7','G'),
406 AV_CODEC_ID_AMR_NB = 0x12000,
409 /* RealAudio codecs*/
410 AV_CODEC_ID_RA_144 = 0x13000,
413 /* various DPCM codecs */
414 AV_CODEC_ID_ROQ_DPCM = 0x14000,
415 AV_CODEC_ID_INTERPLAY_DPCM,
416 AV_CODEC_ID_XAN_DPCM,
417 AV_CODEC_ID_SOL_DPCM,
420 AV_CODEC_ID_MP2 = 0x15000,
421 AV_CODEC_ID_MP3, ///< preferred ID for decoding MPEG audio layer 1, 2 or 3
431 AV_CODEC_ID_VMDAUDIO,
437 AV_CODEC_ID_WESTWOOD_SND1,
438 AV_CODEC_ID_GSM, ///< as in Berlin toast format
441 AV_CODEC_ID_TRUESPEECH,
443 AV_CODEC_ID_SMACKAUDIO,
446 AV_CODEC_ID_DSICINAUDIO,
448 AV_CODEC_ID_MUSEPACK7,
450 AV_CODEC_ID_GSM_MS, /* as found in WAV */
456 AV_CODEC_ID_NELLYMOSER,
457 AV_CODEC_ID_MUSEPACK8,
459 AV_CODEC_ID_WMAVOICE,
461 AV_CODEC_ID_WMALOSSLESS,
470 AV_CODEC_ID_BINKAUDIO_RDFT,
471 AV_CODEC_ID_BINKAUDIO_DCT,
472 AV_CODEC_ID_AAC_LATM,
477 AV_CODEC_ID_8SVX_EXP,
478 AV_CODEC_ID_8SVX_FIB,
479 AV_CODEC_ID_BMV_AUDIO,
483 AV_CODEC_ID_OPUS_DEPRECATED,
484 AV_CODEC_ID_COMFORT_NOISE,
485 AV_CODEC_ID_TAK_DEPRECATED,
486 AV_CODEC_ID_METASOUND,
487 AV_CODEC_ID_PAF_AUDIO_DEPRECATED,
490 AV_CODEC_ID_FFWAVESYNTH = MKBETAG('F','F','W','S'),
491 AV_CODEC_ID_SONIC = MKBETAG('S','O','N','C'),
492 AV_CODEC_ID_SONIC_LS = MKBETAG('S','O','N','L'),
493 AV_CODEC_ID_PAF_AUDIO = MKBETAG('P','A','F','A'),
494 AV_CODEC_ID_OPUS = MKBETAG('O','P','U','S'),
495 AV_CODEC_ID_TAK = MKBETAG('t','B','a','K'),
496 AV_CODEC_ID_EVRC = MKBETAG('s','e','v','c'),
497 AV_CODEC_ID_SMV = MKBETAG('s','s','m','v'),
498 AV_CODEC_ID_DSD_LSBF = MKBETAG('D','S','D','L'),
499 AV_CODEC_ID_DSD_MSBF = MKBETAG('D','S','D','M'),
500 AV_CODEC_ID_DSD_LSBF_PLANAR = MKBETAG('D','S','D','1'),
501 AV_CODEC_ID_DSD_MSBF_PLANAR = MKBETAG('D','S','D','8'),
503 /* subtitle codecs */
504 AV_CODEC_ID_FIRST_SUBTITLE = 0x17000, ///< A dummy ID pointing at the start of subtitle codecs.
505 AV_CODEC_ID_DVD_SUBTITLE = 0x17000,
506 AV_CODEC_ID_DVB_SUBTITLE,
507 AV_CODEC_ID_TEXT, ///< raw UTF-8 text
510 AV_CODEC_ID_MOV_TEXT,
511 AV_CODEC_ID_HDMV_PGS_SUBTITLE,
512 AV_CODEC_ID_DVB_TELETEXT,
514 AV_CODEC_ID_MICRODVD = MKBETAG('m','D','V','D'),
515 AV_CODEC_ID_EIA_608 = MKBETAG('c','6','0','8'),
516 AV_CODEC_ID_JACOSUB = MKBETAG('J','S','U','B'),
517 AV_CODEC_ID_SAMI = MKBETAG('S','A','M','I'),
518 AV_CODEC_ID_REALTEXT = MKBETAG('R','T','X','T'),
519 AV_CODEC_ID_STL = MKBETAG('S','p','T','L'),
520 AV_CODEC_ID_SUBVIEWER1 = MKBETAG('S','b','V','1'),
521 AV_CODEC_ID_SUBVIEWER = MKBETAG('S','u','b','V'),
522 AV_CODEC_ID_SUBRIP = MKBETAG('S','R','i','p'),
523 AV_CODEC_ID_WEBVTT = MKBETAG('W','V','T','T'),
524 AV_CODEC_ID_MPL2 = MKBETAG('M','P','L','2'),
525 AV_CODEC_ID_VPLAYER = MKBETAG('V','P','l','r'),
526 AV_CODEC_ID_PJS = MKBETAG('P','h','J','S'),
527 AV_CODEC_ID_ASS = MKBETAG('A','S','S',' '), ///< ASS as defined in Matroska
529 /* other specific kind of codecs (generally used for attachments) */
530 AV_CODEC_ID_FIRST_UNKNOWN = 0x18000, ///< A dummy ID pointing at the start of various fake codecs.
531 AV_CODEC_ID_TTF = 0x18000,
532 AV_CODEC_ID_BINTEXT = MKBETAG('B','T','X','T'),
533 AV_CODEC_ID_XBIN = MKBETAG('X','B','I','N'),
534 AV_CODEC_ID_IDF = MKBETAG( 0 ,'I','D','F'),
535 AV_CODEC_ID_OTF = MKBETAG( 0 ,'O','T','F'),
536 AV_CODEC_ID_SMPTE_KLV = MKBETAG('K','L','V','A'),
537 AV_CODEC_ID_DVD_NAV = MKBETAG('D','N','A','V'),
538 AV_CODEC_ID_TIMED_ID3 = MKBETAG('T','I','D','3'),
539 AV_CODEC_ID_BIN_DATA = MKBETAG('D','A','T','A'),
542 AV_CODEC_ID_PROBE = 0x19000, ///< codec_id is not known (like AV_CODEC_ID_NONE) but lavf should attempt to identify it
544 AV_CODEC_ID_MPEG2TS = 0x20000, /**< _FAKE_ codec to indicate a raw MPEG-2 TS
545 * stream (only used by libavformat) */
546 AV_CODEC_ID_MPEG4SYSTEMS = 0x20001, /**< _FAKE_ codec to indicate a MPEG-4 Systems
547 * stream (only used by libavformat) */
548 AV_CODEC_ID_FFMETADATA = 0x21000, ///< Dummy codec for streams containing only metadata information.
551 #include "old_codec_ids.h"
556 * This struct describes the properties of a single codec described by an
558 * @see avcodec_descriptor_get()
560 typedef struct AVCodecDescriptor {
562 enum AVMediaType type;
564 * Name of the codec described by this descriptor. It is non-empty and
565 * unique for each codec descriptor. It should contain alphanumeric
566 * characters and '_' only.
570 * A more descriptive name for this codec. May be NULL.
572 const char *long_name;
574 * Codec properties, a combination of AV_CODEC_PROP_* flags.
579 * MIME type(s) associated with the codec.
580 * May be NULL; if not, a NULL-terminated array of MIME types.
581 * The first item is always non-NULL and is the preferred MIME type.
583 const char *const *mime_types;
587 * Codec uses only intra compression.
590 #define AV_CODEC_PROP_INTRA_ONLY (1 << 0)
592 * Codec supports lossy compression. Audio and video codecs only.
593 * @note a codec may support both lossy and lossless
596 #define AV_CODEC_PROP_LOSSY (1 << 1)
598 * Codec supports lossless compression. Audio and video codecs only.
600 #define AV_CODEC_PROP_LOSSLESS (1 << 2)
602 * Codec supports frame reordering. That is, the coded order (the order in which
603 * the encoded packets are output by the encoders / stored / input to the
604 * decoders) may be different from the presentation order of the corresponding
607 * For codecs that do not have this property set, PTS and DTS should always be
610 #define AV_CODEC_PROP_REORDER (1 << 3)
612 * Subtitle codec is bitmap based
613 * Decoded AVSubtitle data can be read from the AVSubtitleRect->pict field.
615 #define AV_CODEC_PROP_BITMAP_SUB (1 << 16)
617 * Subtitle codec is text based.
618 * Decoded AVSubtitle data can be read from the AVSubtitleRect->ass field.
620 #define AV_CODEC_PROP_TEXT_SUB (1 << 17)
623 * @ingroup lavc_decoding
624 * Required number of additionally allocated bytes at the end of the input bitstream for decoding.
625 * This is mainly needed because some optimized bitstream readers read
626 * 32 or 64 bit at once and could read over the end.<br>
627 * Note: If the first 23 bits of the additional bytes are not 0, then damaged
628 * MPEG bitstreams could cause overread and segfault.
630 #define FF_INPUT_BUFFER_PADDING_SIZE 32
633 * @ingroup lavc_encoding
634 * minimum encoding buffer size
635 * Used to avoid some checks during header writing.
637 #define FF_MIN_BUFFER_SIZE 16384
641 * @ingroup lavc_encoding
642 * motion estimation type.
645 ME_ZERO = 1, ///< no search, that is use 0,0 vector whenever one is needed
649 ME_EPZS, ///< enhanced predictive zonal search
650 ME_X1, ///< reserved for experiments
651 ME_HEX, ///< hexagon based search
652 ME_UMH, ///< uneven multi-hexagon search
653 ME_TESA, ///< transformed exhaustive search algorithm
654 ME_ITER=50, ///< iterative search
658 * @ingroup lavc_decoding
661 /* We leave some space between them for extensions (drop some
662 * keyframes for intra-only or drop just some bidir frames). */
663 AVDISCARD_NONE =-16, ///< discard nothing
664 AVDISCARD_DEFAULT = 0, ///< discard useless packets like 0 size packets in avi
665 AVDISCARD_NONREF = 8, ///< discard all non reference
666 AVDISCARD_BIDIR = 16, ///< discard all bidirectional frames
667 AVDISCARD_NONINTRA= 24, ///< discard all non intra frames
668 AVDISCARD_NONKEY = 32, ///< discard all frames except keyframes
669 AVDISCARD_ALL = 48, ///< discard all
672 enum AVAudioServiceType {
673 AV_AUDIO_SERVICE_TYPE_MAIN = 0,
674 AV_AUDIO_SERVICE_TYPE_EFFECTS = 1,
675 AV_AUDIO_SERVICE_TYPE_VISUALLY_IMPAIRED = 2,
676 AV_AUDIO_SERVICE_TYPE_HEARING_IMPAIRED = 3,
677 AV_AUDIO_SERVICE_TYPE_DIALOGUE = 4,
678 AV_AUDIO_SERVICE_TYPE_COMMENTARY = 5,
679 AV_AUDIO_SERVICE_TYPE_EMERGENCY = 6,
680 AV_AUDIO_SERVICE_TYPE_VOICE_OVER = 7,
681 AV_AUDIO_SERVICE_TYPE_KARAOKE = 8,
682 AV_AUDIO_SERVICE_TYPE_NB , ///< Not part of ABI
686 * @ingroup lavc_encoding
688 typedef struct RcOverride{
691 int qscale; // If this is 0 then quality_factor will be used instead.
692 float quality_factor;
695 #if FF_API_MAX_BFRAMES
697 * @deprecated there is no libavcodec-wide limit on the number of B-frames
699 #define FF_MAX_B_FRAMES 16
703 These flags can be passed in AVCodecContext.flags before initialization.
704 Note: Not everything is supported yet.
708 * Allow decoders to produce frames with data planes that are not aligned
709 * to CPU requirements (e.g. due to cropping).
711 #define CODEC_FLAG_UNALIGNED 0x0001
712 #define CODEC_FLAG_QSCALE 0x0002 ///< Use fixed qscale.
713 #define CODEC_FLAG_4MV 0x0004 ///< 4 MV per MB allowed / advanced prediction for H.263.
714 #define CODEC_FLAG_OUTPUT_CORRUPT 0x0008 ///< Output even those frames that might be corrupted
715 #define CODEC_FLAG_QPEL 0x0010 ///< Use qpel MC.
718 * @deprecated use the "gmc" private option of the libxvid encoder
720 #define CODEC_FLAG_GMC 0x0020 ///< Use GMC.
724 * @deprecated use the flag "mv0" in the "mpv_flags" private option of the
727 #define CODEC_FLAG_MV0 0x0040
729 #if FF_API_INPUT_PRESERVED
731 * @deprecated passing reference-counted frames to the encoders replaces this
734 #define CODEC_FLAG_INPUT_PRESERVED 0x0100
736 #define CODEC_FLAG_PASS1 0x0200 ///< Use internal 2pass ratecontrol in first pass mode.
737 #define CODEC_FLAG_PASS2 0x0400 ///< Use internal 2pass ratecontrol in second pass mode.
738 #define CODEC_FLAG_GRAY 0x2000 ///< Only decode/encode grayscale.
741 * @deprecated edges are not used/required anymore. I.e. this flag is now always
744 #define CODEC_FLAG_EMU_EDGE 0x4000
746 #define CODEC_FLAG_PSNR 0x8000 ///< error[?] variables will be set during encoding.
747 #define CODEC_FLAG_TRUNCATED 0x00010000 /** Input bitstream might be truncated at a random
748 location instead of only at frame boundaries. */
749 #if FF_API_NORMALIZE_AQP
751 * @deprecated use the flag "naq" in the "mpv_flags" private option of the
754 #define CODEC_FLAG_NORMALIZE_AQP 0x00020000
756 #define CODEC_FLAG_INTERLACED_DCT 0x00040000 ///< Use interlaced DCT.
757 #define CODEC_FLAG_LOW_DELAY 0x00080000 ///< Force low delay.
758 #define CODEC_FLAG_GLOBAL_HEADER 0x00400000 ///< Place global headers in extradata instead of every keyframe.
759 #define CODEC_FLAG_BITEXACT 0x00800000 ///< Use only bitexact stuff (except (I)DCT).
760 /* Fx : Flag for h263+ extra options */
761 #define CODEC_FLAG_AC_PRED 0x01000000 ///< H.263 advanced intra coding / MPEG-4 AC prediction
762 #define CODEC_FLAG_LOOP_FILTER 0x00000800 ///< loop filter
763 #define CODEC_FLAG_INTERLACED_ME 0x20000000 ///< interlaced motion estimation
764 #define CODEC_FLAG_CLOSED_GOP 0x80000000
765 #define CODEC_FLAG2_FAST 0x00000001 ///< Allow non spec compliant speedup tricks.
766 #define CODEC_FLAG2_NO_OUTPUT 0x00000004 ///< Skip bitstream encoding.
767 #define CODEC_FLAG2_LOCAL_HEADER 0x00000008 ///< Place global headers at every keyframe instead of in extradata.
768 #define CODEC_FLAG2_DROP_FRAME_TIMECODE 0x00002000 ///< timecode is in drop frame format. DEPRECATED!!!!
769 #define CODEC_FLAG2_IGNORE_CROP 0x00010000 ///< Discard cropping information from SPS.
771 #define CODEC_FLAG2_CHUNKS 0x00008000 ///< Input bitstream might be truncated at a packet boundaries instead of only at frame boundaries.
772 #define CODEC_FLAG2_SHOW_ALL 0x00400000 ///< Show all frames before the first keyframe
773 #define CODEC_FLAG2_EXPORT_MVS 0x10000000 ///< Export motion vectors through frame side data
774 #define CODEC_FLAG2_SKIP_MANUAL 0x20000000 ///< Do not skip samples and export skip information as frame side data
776 /* Unsupported options :
777 * Syntax Arithmetic coding (SAC)
778 * Reference Picture Selection
779 * Independent Segment Decoding */
781 /* codec capabilities */
783 #define CODEC_CAP_DRAW_HORIZ_BAND 0x0001 ///< Decoder can use draw_horiz_band callback.
785 * Codec uses get_buffer() for allocating buffers and supports custom allocators.
786 * If not set, it might not use get_buffer() at all or use operations that
787 * assume the buffer was allocated by avcodec_default_get_buffer.
789 #define CODEC_CAP_DR1 0x0002
790 #define CODEC_CAP_TRUNCATED 0x0008
792 /* Codec can export data for HW decoding. This flag indicates that
793 * the codec would call get_format() with list that might contain HW accelerated
794 * pixel formats (XvMC, VDPAU, VAAPI, etc). The application can pick any of them
795 * including raw image format.
796 * The application can use the passed context to determine bitstream version,
797 * chroma format, resolution etc.
799 #define CODEC_CAP_HWACCEL 0x0010
800 #endif /* FF_API_XVMC */
802 * Encoder or decoder requires flushing with NULL input at the end in order to
803 * give the complete and correct output.
805 * NOTE: If this flag is not set, the codec is guaranteed to never be fed with
806 * with NULL data. The user can still send NULL data to the public encode
807 * or decode function, but libavcodec will not pass it along to the codec
808 * unless this flag is set.
811 * The decoder has a non-zero delay and needs to be fed with avpkt->data=NULL,
812 * avpkt->size=0 at the end to get the delayed data until the decoder no longer
816 * The encoder needs to be fed with NULL data at the end of encoding until the
817 * encoder no longer returns data.
819 * NOTE: For encoders implementing the AVCodec.encode2() function, setting this
820 * flag also means that the encoder must set the pts and duration for
821 * each output packet. If this flag is not set, the pts and duration will
822 * be determined by libavcodec from the input frame.
824 #define CODEC_CAP_DELAY 0x0020
826 * Codec can be fed a final frame with a smaller size.
827 * This can be used to prevent truncation of the last audio samples.
829 #define CODEC_CAP_SMALL_LAST_FRAME 0x0040
832 * Codec can export data for HW decoding (VDPAU).
834 #define CODEC_CAP_HWACCEL_VDPAU 0x0080
837 * Codec can output multiple frames per AVPacket
838 * Normally demuxers return one frame at a time, demuxers which do not do
839 * are connected to a parser to split what they return into proper frames.
840 * This flag is reserved to the very rare category of codecs which have a
841 * bitstream that cannot be split into frames without timeconsuming
842 * operations like full decoding. Demuxers carring such bitstreams thus
843 * may return multiple frames in a packet. This has many disadvantages like
844 * prohibiting stream copy in many cases thus it should only be considered
847 #define CODEC_CAP_SUBFRAMES 0x0100
849 * Codec is experimental and is thus avoided in favor of non experimental
852 #define CODEC_CAP_EXPERIMENTAL 0x0200
854 * Codec should fill in channel configuration and samplerate instead of container
856 #define CODEC_CAP_CHANNEL_CONF 0x0400
857 #if FF_API_NEG_LINESIZES
859 * @deprecated no codecs use this capability
861 #define CODEC_CAP_NEG_LINESIZES 0x0800
864 * Codec supports frame-level multithreading.
866 #define CODEC_CAP_FRAME_THREADS 0x1000
868 * Codec supports slice-based (or partition-based) multithreading.
870 #define CODEC_CAP_SLICE_THREADS 0x2000
872 * Codec supports changed parameters at any point.
874 #define CODEC_CAP_PARAM_CHANGE 0x4000
876 * Codec supports avctx->thread_count == 0 (auto).
878 #define CODEC_CAP_AUTO_THREADS 0x8000
880 * Audio encoder supports receiving a different number of samples in each call.
882 #define CODEC_CAP_VARIABLE_FRAME_SIZE 0x10000
884 * Codec is intra only.
886 #define CODEC_CAP_INTRA_ONLY 0x40000000
890 #define CODEC_CAP_LOSSLESS 0x80000000
893 //The following defines may change, don't expect compatibility if you use them.
894 #define MB_TYPE_INTRA4x4 0x0001
895 #define MB_TYPE_INTRA16x16 0x0002 //FIXME H.264-specific
896 #define MB_TYPE_INTRA_PCM 0x0004 //FIXME H.264-specific
897 #define MB_TYPE_16x16 0x0008
898 #define MB_TYPE_16x8 0x0010
899 #define MB_TYPE_8x16 0x0020
900 #define MB_TYPE_8x8 0x0040
901 #define MB_TYPE_INTERLACED 0x0080
902 #define MB_TYPE_DIRECT2 0x0100 //FIXME
903 #define MB_TYPE_ACPRED 0x0200
904 #define MB_TYPE_GMC 0x0400
905 #define MB_TYPE_SKIP 0x0800
906 #define MB_TYPE_P0L0 0x1000
907 #define MB_TYPE_P1L0 0x2000
908 #define MB_TYPE_P0L1 0x4000
909 #define MB_TYPE_P1L1 0x8000
910 #define MB_TYPE_L0 (MB_TYPE_P0L0 | MB_TYPE_P1L0)
911 #define MB_TYPE_L1 (MB_TYPE_P0L1 | MB_TYPE_P1L1)
912 #define MB_TYPE_L0L1 (MB_TYPE_L0 | MB_TYPE_L1)
913 #define MB_TYPE_QUANT 0x00010000
914 #define MB_TYPE_CBP 0x00020000
915 //Note bits 24-31 are reserved for codec specific use (h264 ref0, mpeg1 0mv, ...)
920 * This specifies the area which should be displayed.
921 * Note there may be multiple such areas for one frame.
923 typedef struct AVPanScan{
926 * - encoding: Set by user.
927 * - decoding: Set by libavcodec.
932 * width and height in 1/16 pel
933 * - encoding: Set by user.
934 * - decoding: Set by libavcodec.
940 * position of the top left corner in 1/16 pel for up to 3 fields/frames
941 * - encoding: Set by user.
942 * - decoding: Set by libavcodec.
944 int16_t position[3][2];
947 #if FF_API_QSCALE_TYPE
948 #define FF_QSCALE_TYPE_MPEG1 0
949 #define FF_QSCALE_TYPE_MPEG2 1
950 #define FF_QSCALE_TYPE_H264 2
951 #define FF_QSCALE_TYPE_VP56 3
954 #if FF_API_GET_BUFFER
955 #define FF_BUFFER_TYPE_INTERNAL 1
956 #define FF_BUFFER_TYPE_USER 2 ///< direct rendering buffers (image is (de)allocated by user)
957 #define FF_BUFFER_TYPE_SHARED 4 ///< Buffer from somewhere else; don't deallocate image (data/base), all other tables are not shared.
958 #define FF_BUFFER_TYPE_COPY 8 ///< Just a (modified) copy of some other buffer, don't deallocate anything.
960 #define FF_BUFFER_HINTS_VALID 0x01 // Buffer hints value is meaningful (if 0 ignore).
961 #define FF_BUFFER_HINTS_READABLE 0x02 // Codec will read from buffer.
962 #define FF_BUFFER_HINTS_PRESERVE 0x04 // User must not alter buffer content.
963 #define FF_BUFFER_HINTS_REUSABLE 0x08 // Codec will reuse the buffer (update).
967 * The decoder will keep a reference to the frame and may reuse it later.
969 #define AV_GET_BUFFER_FLAG_REF (1 << 0)
972 * @defgroup lavc_packet AVPacket
974 * Types and functions for working with AVPacket.
977 enum AVPacketSideDataType {
979 AV_PKT_DATA_NEW_EXTRADATA,
982 * An AV_PKT_DATA_PARAM_CHANGE side data packet is laid out as follows:
985 * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_COUNT)
986 * s32le channel_count
987 * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_LAYOUT)
988 * u64le channel_layout
989 * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_SAMPLE_RATE)
991 * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_DIMENSIONS)
996 AV_PKT_DATA_PARAM_CHANGE,
999 * An AV_PKT_DATA_H263_MB_INFO side data packet contains a number of
1000 * structures with info about macroblocks relevant to splitting the
1001 * packet into smaller packets on macroblock edges (e.g. as for RFC 2190).
1002 * That is, it does not necessarily contain info about all macroblocks,
1003 * as long as the distance between macroblocks in the info is smaller
1004 * than the target payload size.
1005 * Each MB info structure is 12 bytes, and is laid out as follows:
1007 * u32le bit offset from the start of the packet
1008 * u8 current quantizer at the start of the macroblock
1010 * u16le macroblock address within the GOB
1011 * u8 horizontal MV predictor
1012 * u8 vertical MV predictor
1013 * u8 horizontal MV predictor for block number 3
1014 * u8 vertical MV predictor for block number 3
1017 AV_PKT_DATA_H263_MB_INFO,
1020 * This side data should be associated with an audio stream and contains
1021 * ReplayGain information in form of the AVReplayGain struct.
1023 AV_PKT_DATA_REPLAYGAIN,
1026 * This side data contains a 3x3 transformation matrix describing an affine
1027 * transformation that needs to be applied to the decoded video frames for
1028 * correct presentation.
1030 * See libavutil/display.h for a detailed description of the data.
1032 AV_PKT_DATA_DISPLAYMATRIX,
1035 * This side data should be associated with a video stream and contains
1036 * Stereoscopic 3D information in form of the AVStereo3D struct.
1038 AV_PKT_DATA_STEREO3D,
1041 * This side data should be associated with an audio stream and corresponds
1042 * to enum AVAudioServiceType.
1044 AV_PKT_DATA_AUDIO_SERVICE_TYPE,
1047 * Recommmends skipping the specified number of samples
1049 * u32le number of samples to skip from start of this packet
1050 * u32le number of samples to skip from end of this packet
1051 * u8 reason for start skip
1052 * u8 reason for end skip (0=padding silence, 1=convergence)
1055 AV_PKT_DATA_SKIP_SAMPLES=70,
1058 * An AV_PKT_DATA_JP_DUALMONO side data packet indicates that
1059 * the packet may contain "dual mono" audio specific to Japanese DTV
1060 * and if it is true, recommends only the selected channel to be used.
1062 * u8 selected channels (0=mail/left, 1=sub/right, 2=both)
1065 AV_PKT_DATA_JP_DUALMONO,
1068 * A list of zero terminated key/value strings. There is no end marker for
1069 * the list, so it is required to rely on the side data size to stop.
1071 AV_PKT_DATA_STRINGS_METADATA,
1074 * Subtitle event position
1082 AV_PKT_DATA_SUBTITLE_POSITION,
1085 * Data found in BlockAdditional element of matroska container. There is
1086 * no end marker for the data, so it is required to rely on the side data
1087 * size to recognize the end. 8 byte id (as found in BlockAddId) followed
1090 AV_PKT_DATA_MATROSKA_BLOCKADDITIONAL,
1093 * The optional first identifier line of a WebVTT cue.
1095 AV_PKT_DATA_WEBVTT_IDENTIFIER,
1098 * The optional settings (rendering instructions) that immediately
1099 * follow the timestamp specifier of a WebVTT cue.
1101 AV_PKT_DATA_WEBVTT_SETTINGS,
1104 * A list of zero terminated key/value strings. There is no end marker for
1105 * the list, so it is required to rely on the side data size to stop. This
1106 * side data includes updated metadata which appeared in the stream.
1108 AV_PKT_DATA_METADATA_UPDATE,
1111 typedef struct AVPacketSideData {
1114 enum AVPacketSideDataType type;
1118 * This structure stores compressed data. It is typically exported by demuxers
1119 * and then passed as input to decoders, or received as output from encoders and
1120 * then passed to muxers.
1122 * For video, it should typically contain one compressed frame. For audio it may
1123 * contain several compressed frames.
1125 * AVPacket is one of the few structs in FFmpeg, whose size is a part of public
1126 * ABI. Thus it may be allocated on stack and no new fields can be added to it
1127 * without libavcodec and libavformat major bump.
1129 * The semantics of data ownership depends on the buf or destruct (deprecated)
1130 * fields. If either is set, the packet data is dynamically allocated and is
1131 * valid indefinitely until av_free_packet() is called (which in turn calls
1132 * av_buffer_unref()/the destruct callback to free the data). If neither is set,
1133 * the packet data is typically backed by some static buffer somewhere and is
1134 * only valid for a limited time (e.g. until the next read call when demuxing).
1136 * The side data is always allocated with av_malloc() and is freed in
1139 typedef struct AVPacket {
1141 * A reference to the reference-counted buffer where the packet data is
1143 * May be NULL, then the packet data is not reference-counted.
1147 * Presentation timestamp in AVStream->time_base units; the time at which
1148 * the decompressed packet will be presented to the user.
1149 * Can be AV_NOPTS_VALUE if it is not stored in the file.
1150 * pts MUST be larger or equal to dts as presentation cannot happen before
1151 * decompression, unless one wants to view hex dumps. Some formats misuse
1152 * the terms dts and pts/cts to mean something different. Such timestamps
1153 * must be converted to true pts/dts before they are stored in AVPacket.
1157 * Decompression timestamp in AVStream->time_base units; the time at which
1158 * the packet is decompressed.
1159 * Can be AV_NOPTS_VALUE if it is not stored in the file.
1166 * A combination of AV_PKT_FLAG values
1170 * Additional packet data that can be provided by the container.
1171 * Packet can contain several types of side information.
1173 AVPacketSideData *side_data;
1174 int side_data_elems;
1177 * Duration of this packet in AVStream->time_base units, 0 if unknown.
1178 * Equals next_pts - this_pts in presentation order.
1181 #if FF_API_DESTRUCT_PACKET
1182 attribute_deprecated
1183 void (*destruct)(struct AVPacket *);
1184 attribute_deprecated
1187 int64_t pos; ///< byte position in stream, -1 if unknown
1190 * Time difference in AVStream->time_base units from the pts of this
1191 * packet to the point at which the output from the decoder has converged
1192 * independent from the availability of previous frames. That is, the
1193 * frames are virtually identical no matter if decoding started from
1194 * the very first frame or from this keyframe.
1195 * Is AV_NOPTS_VALUE if unknown.
1196 * This field is not the display duration of the current packet.
1197 * This field has no meaning if the packet does not have AV_PKT_FLAG_KEY
1200 * The purpose of this field is to allow seeking in streams that have no
1201 * keyframes in the conventional sense. It corresponds to the
1202 * recovery point SEI in H.264 and match_time_delta in NUT. It is also
1203 * essential for some types of subtitle streams to ensure that all
1204 * subtitles are correctly displayed after seeking.
1206 int64_t convergence_duration;
1208 #define AV_PKT_FLAG_KEY 0x0001 ///< The packet contains a keyframe
1209 #define AV_PKT_FLAG_CORRUPT 0x0002 ///< The packet content is corrupted
1211 enum AVSideDataParamChangeFlags {
1212 AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_COUNT = 0x0001,
1213 AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_LAYOUT = 0x0002,
1214 AV_SIDE_DATA_PARAM_CHANGE_SAMPLE_RATE = 0x0004,
1215 AV_SIDE_DATA_PARAM_CHANGE_DIMENSIONS = 0x0008,
1221 struct AVCodecInternal;
1225 AV_FIELD_PROGRESSIVE,
1226 AV_FIELD_TT, //< Top coded_first, top displayed first
1227 AV_FIELD_BB, //< Bottom coded first, bottom displayed first
1228 AV_FIELD_TB, //< Top coded first, bottom displayed first
1229 AV_FIELD_BT, //< Bottom coded first, top displayed first
1233 * main external API structure.
1234 * New fields can be added to the end with minor version bumps.
1235 * Removal, reordering and changes to existing fields require a major
1237 * Please use AVOptions (av_opt* / av_set/get*()) to access these fields from user
1239 * sizeof(AVCodecContext) must not be used outside libav*.
1241 typedef struct AVCodecContext {
1243 * information on struct for av_log
1244 * - set by avcodec_alloc_context3
1246 const AVClass *av_class;
1247 int log_level_offset;
1249 enum AVMediaType codec_type; /* see AVMEDIA_TYPE_xxx */
1250 const struct AVCodec *codec;
1251 #if FF_API_CODEC_NAME
1253 * @deprecated this field is not used for anything in libavcodec
1255 attribute_deprecated
1256 char codec_name[32];
1258 enum AVCodecID codec_id; /* see AV_CODEC_ID_xxx */
1261 * fourcc (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A').
1262 * This is used to work around some encoder bugs.
1263 * A demuxer should set this to what is stored in the field used to identify the codec.
1264 * If there are multiple such fields in a container then the demuxer should choose the one
1265 * which maximizes the information about the used codec.
1266 * If the codec tag field in a container is larger than 32 bits then the demuxer should
1267 * remap the longer ID to 32 bits with a table or other structure. Alternatively a new
1268 * extra_codec_tag + size could be added but for this a clear advantage must be demonstrated
1270 * - encoding: Set by user, if not then the default based on codec_id will be used.
1271 * - decoding: Set by user, will be converted to uppercase by libavcodec during init.
1273 unsigned int codec_tag;
1275 #if FF_API_STREAM_CODEC_TAG
1277 * @deprecated this field is unused
1279 attribute_deprecated
1280 unsigned int stream_codec_tag;
1286 * Private context used for internal data.
1288 * Unlike priv_data, this is not codec-specific. It is used in general
1289 * libavcodec functions.
1291 struct AVCodecInternal *internal;
1294 * Private data of the user, can be used to carry app specific stuff.
1295 * - encoding: Set by user.
1296 * - decoding: Set by user.
1301 * the average bitrate
1302 * - encoding: Set by user; unused for constant quantizer encoding.
1303 * - decoding: Set by libavcodec. 0 or some bitrate if this info is available in the stream.
1308 * number of bits the bitstream is allowed to diverge from the reference.
1309 * the reference can be CBR (for CBR pass1) or VBR (for pass2)
1310 * - encoding: Set by user; unused for constant quantizer encoding.
1311 * - decoding: unused
1313 int bit_rate_tolerance;
1316 * Global quality for codecs which cannot change it per frame.
1317 * This should be proportional to MPEG-1/2/4 qscale.
1318 * - encoding: Set by user.
1319 * - decoding: unused
1324 * - encoding: Set by user.
1325 * - decoding: unused
1327 int compression_level;
1328 #define FF_COMPRESSION_DEFAULT -1
1332 * - encoding: Set by user.
1333 * - decoding: Set by user.
1339 * - encoding: Set by user.
1340 * - decoding: Set by user.
1345 * some codecs need / can use extradata like Huffman tables.
1346 * mjpeg: Huffman tables
1347 * rv10: additional flags
1348 * mpeg4: global headers (they can be in the bitstream or here)
1349 * The allocated memory should be FF_INPUT_BUFFER_PADDING_SIZE bytes larger
1350 * than extradata_size to avoid problems if it is read with the bitstream reader.
1351 * The bytewise contents of extradata must not depend on the architecture or CPU endianness.
1352 * - encoding: Set/allocated/freed by libavcodec.
1353 * - decoding: Set/allocated/freed by user.
1359 * This is the fundamental unit of time (in seconds) in terms
1360 * of which frame timestamps are represented. For fixed-fps content,
1361 * timebase should be 1/framerate and timestamp increments should be
1363 * This often, but not always is the inverse of the frame rate or field rate
1365 * - encoding: MUST be set by user.
1366 * - decoding: the use of this field for decoding is deprecated.
1367 * Use framerate instead.
1369 AVRational time_base;
1372 * For some codecs, the time base is closer to the field rate than the frame rate.
1373 * Most notably, H.264 and MPEG-2 specify time_base as half of frame duration
1374 * if no telecine is used ...
1376 * Set to time_base ticks per frame. Default 1, e.g., H.264/MPEG-2 set it to 2.
1378 int ticks_per_frame;
1383 * Encoding: Number of frames delay there will be from the encoder input to
1384 * the decoder output. (we assume the decoder matches the spec)
1385 * Decoding: Number of frames delay in addition to what a standard decoder
1386 * as specified in the spec would produce.
1389 * Number of frames the decoded output will be delayed relative to the
1393 * For encoding, this field is unused (see initial_padding).
1395 * For decoding, this is the number of samples the decoder needs to
1396 * output before the decoder's output is valid. When seeking, you should
1397 * start decoding this many samples prior to your desired seek point.
1399 * - encoding: Set by libavcodec.
1400 * - decoding: Set by libavcodec.
1407 * picture width / height.
1408 * - encoding: MUST be set by user.
1409 * - decoding: May be set by the user before opening the decoder if known e.g.
1410 * from the container. Some decoders will require the dimensions
1411 * to be set by the caller. During decoding, the decoder may
1412 * overwrite those values as required.
1417 * Bitstream width / height, may be different from width/height e.g. when
1418 * the decoded frame is cropped before being output or lowres is enabled.
1419 * - encoding: unused
1420 * - decoding: May be set by the user before opening the decoder if known
1421 * e.g. from the container. During decoding, the decoder may
1422 * overwrite those values as required.
1424 int coded_width, coded_height;
1426 #if FF_API_ASPECT_EXTENDED
1427 #define FF_ASPECT_EXTENDED 15
1431 * the number of pictures in a group of pictures, or 0 for intra_only
1432 * - encoding: Set by user.
1433 * - decoding: unused
1438 * Pixel format, see AV_PIX_FMT_xxx.
1439 * May be set by the demuxer if known from headers.
1440 * May be overridden by the decoder if it knows better.
1441 * - encoding: Set by user.
1442 * - decoding: Set by user if known, overridden by libavcodec if known
1444 enum AVPixelFormat pix_fmt;
1447 * Motion estimation algorithm used for video coding.
1448 * 1 (zero), 2 (full), 3 (log), 4 (phods), 5 (epzs), 6 (x1), 7 (hex),
1449 * 8 (umh), 9 (iter), 10 (tesa) [7, 8, 10 are x264 specific, 9 is snow specific]
1450 * - encoding: MUST be set by user.
1451 * - decoding: unused
1456 * If non NULL, 'draw_horiz_band' is called by the libavcodec
1457 * decoder to draw a horizontal band. It improves cache usage. Not
1458 * all codecs can do that. You must check the codec capabilities
1460 * When multithreading is used, it may be called from multiple threads
1461 * at the same time; threads might draw different parts of the same AVFrame,
1462 * or multiple AVFrames, and there is no guarantee that slices will be drawn
1464 * The function is also used by hardware acceleration APIs.
1465 * It is called at least once during frame decoding to pass
1466 * the data needed for hardware render.
1467 * In that mode instead of pixel data, AVFrame points to
1468 * a structure specific to the acceleration API. The application
1469 * reads the structure and can change some fields to indicate progress
1471 * - encoding: unused
1472 * - decoding: Set by user.
1473 * @param height the height of the slice
1474 * @param y the y position of the slice
1475 * @param type 1->top field, 2->bottom field, 3->frame
1476 * @param offset offset into the AVFrame.data from which the slice should be read
1478 void (*draw_horiz_band)(struct AVCodecContext *s,
1479 const AVFrame *src, int offset[AV_NUM_DATA_POINTERS],
1480 int y, int type, int height);
1483 * callback to negotiate the pixelFormat
1484 * @param fmt is the list of formats which are supported by the codec,
1485 * it is terminated by -1 as 0 is a valid format, the formats are ordered by quality.
1486 * The first is always the native one.
1487 * @note The callback may be called again immediately if initialization for
1488 * the selected (hardware-accelerated) pixel format failed.
1489 * @warning Behavior is undefined if the callback returns a value not
1490 * in the fmt list of formats.
1491 * @return the chosen format
1492 * - encoding: unused
1493 * - decoding: Set by user, if not set the native format will be chosen.
1495 enum AVPixelFormat (*get_format)(struct AVCodecContext *s, const enum AVPixelFormat * fmt);
1498 * maximum number of B-frames between non-B-frames
1499 * Note: The output will be delayed by max_b_frames+1 relative to the input.
1500 * - encoding: Set by user.
1501 * - decoding: unused
1506 * qscale factor between IP and B-frames
1507 * If > 0 then the last P-frame quantizer will be used (q= lastp_q*factor+offset).
1508 * If < 0 then normal ratecontrol will be done (q= -normal_q*factor+offset).
1509 * - encoding: Set by user.
1510 * - decoding: unused
1512 float b_quant_factor;
1514 /** obsolete FIXME remove */
1516 #define FF_RC_STRATEGY_XVID 1
1518 int b_frame_strategy;
1521 * qscale offset between IP and B-frames
1522 * - encoding: Set by user.
1523 * - decoding: unused
1525 float b_quant_offset;
1528 * Size of the frame reordering buffer in the decoder.
1529 * For MPEG-2 it is 1 IPB or 0 low delay IP.
1530 * - encoding: Set by libavcodec.
1531 * - decoding: Set by libavcodec.
1536 * 0-> h263 quant 1-> mpeg quant
1537 * - encoding: Set by user.
1538 * - decoding: unused
1543 * qscale factor between P and I-frames
1544 * If > 0 then the last p frame quantizer will be used (q= lastp_q*factor+offset).
1545 * If < 0 then normal ratecontrol will be done (q= -normal_q*factor+offset).
1546 * - encoding: Set by user.
1547 * - decoding: unused
1549 float i_quant_factor;
1552 * qscale offset between P and I-frames
1553 * - encoding: Set by user.
1554 * - decoding: unused
1556 float i_quant_offset;
1559 * luminance masking (0-> disabled)
1560 * - encoding: Set by user.
1561 * - decoding: unused
1566 * temporary complexity masking (0-> disabled)
1567 * - encoding: Set by user.
1568 * - decoding: unused
1570 float temporal_cplx_masking;
1573 * spatial complexity masking (0-> disabled)
1574 * - encoding: Set by user.
1575 * - decoding: unused
1577 float spatial_cplx_masking;
1580 * p block masking (0-> disabled)
1581 * - encoding: Set by user.
1582 * - decoding: unused
1587 * darkness masking (0-> disabled)
1588 * - encoding: Set by user.
1589 * - decoding: unused
1595 * - encoding: Set by libavcodec.
1596 * - decoding: Set by user (or 0).
1600 * prediction method (needed for huffyuv)
1601 * - encoding: Set by user.
1602 * - decoding: unused
1604 int prediction_method;
1605 #define FF_PRED_LEFT 0
1606 #define FF_PRED_PLANE 1
1607 #define FF_PRED_MEDIAN 2
1610 * slice offsets in the frame in bytes
1611 * - encoding: Set/allocated by libavcodec.
1612 * - decoding: Set/allocated by user (or NULL).
1617 * sample aspect ratio (0 if unknown)
1618 * That is the width of a pixel divided by the height of the pixel.
1619 * Numerator and denominator must be relatively prime and smaller than 256 for some video standards.
1620 * - encoding: Set by user.
1621 * - decoding: Set by libavcodec.
1623 AVRational sample_aspect_ratio;
1626 * motion estimation comparison function
1627 * - encoding: Set by user.
1628 * - decoding: unused
1632 * subpixel motion estimation comparison function
1633 * - encoding: Set by user.
1634 * - decoding: unused
1638 * macroblock comparison function (not supported yet)
1639 * - encoding: Set by user.
1640 * - decoding: unused
1644 * interlaced DCT comparison function
1645 * - encoding: Set by user.
1646 * - decoding: unused
1649 #define FF_CMP_SAD 0
1650 #define FF_CMP_SSE 1
1651 #define FF_CMP_SATD 2
1652 #define FF_CMP_DCT 3
1653 #define FF_CMP_PSNR 4
1654 #define FF_CMP_BIT 5
1656 #define FF_CMP_ZERO 7
1657 #define FF_CMP_VSAD 8
1658 #define FF_CMP_VSSE 9
1659 #define FF_CMP_NSSE 10
1660 #define FF_CMP_W53 11
1661 #define FF_CMP_W97 12
1662 #define FF_CMP_DCTMAX 13
1663 #define FF_CMP_DCT264 14
1664 #define FF_CMP_CHROMA 256
1667 * ME diamond size & shape
1668 * - encoding: Set by user.
1669 * - decoding: unused
1674 * amount of previous MV predictors (2a+1 x 2a+1 square)
1675 * - encoding: Set by user.
1676 * - decoding: unused
1678 int last_predictor_count;
1681 * prepass for motion estimation
1682 * - encoding: Set by user.
1683 * - decoding: unused
1688 * motion estimation prepass comparison function
1689 * - encoding: Set by user.
1690 * - decoding: unused
1695 * ME prepass diamond size & shape
1696 * - encoding: Set by user.
1697 * - decoding: unused
1703 * - encoding: Set by user.
1704 * - decoding: unused
1706 int me_subpel_quality;
1710 * DTG active format information (additional aspect ratio
1711 * information only used in DVB MPEG-2 transport streams)
1714 * - encoding: unused
1715 * - decoding: Set by decoder.
1716 * @deprecated Deprecated in favor of AVSideData
1718 attribute_deprecated int dtg_active_format;
1719 #define FF_DTG_AFD_SAME 8
1720 #define FF_DTG_AFD_4_3 9
1721 #define FF_DTG_AFD_16_9 10
1722 #define FF_DTG_AFD_14_9 11
1723 #define FF_DTG_AFD_4_3_SP_14_9 13
1724 #define FF_DTG_AFD_16_9_SP_14_9 14
1725 #define FF_DTG_AFD_SP_4_3 15
1726 #endif /* FF_API_AFD */
1729 * maximum motion estimation search range in subpel units
1730 * If 0 then no limit.
1732 * - encoding: Set by user.
1733 * - decoding: unused
1738 * intra quantizer bias
1739 * - encoding: Set by user.
1740 * - decoding: unused
1742 int intra_quant_bias;
1743 #define FF_DEFAULT_QUANT_BIAS 999999
1746 * inter quantizer bias
1747 * - encoding: Set by user.
1748 * - decoding: unused
1750 int inter_quant_bias;
1754 * - encoding: unused
1755 * - decoding: Set by user.
1758 #define SLICE_FLAG_CODED_ORDER 0x0001 ///< draw_horiz_band() is called in coded order instead of display
1759 #define SLICE_FLAG_ALLOW_FIELD 0x0002 ///< allow draw_horiz_band() with field slices (MPEG2 field pics)
1760 #define SLICE_FLAG_ALLOW_PLANE 0x0004 ///< allow draw_horiz_band() with 1 component at a time (SVQ1)
1764 * XVideo Motion Acceleration
1765 * - encoding: forbidden
1766 * - decoding: set by decoder
1767 * @deprecated XvMC doesn't need it anymore.
1769 attribute_deprecated int xvmc_acceleration;
1770 #endif /* FF_API_XVMC */
1773 * macroblock decision mode
1774 * - encoding: Set by user.
1775 * - decoding: unused
1778 #define FF_MB_DECISION_SIMPLE 0 ///< uses mb_cmp
1779 #define FF_MB_DECISION_BITS 1 ///< chooses the one which needs the fewest bits
1780 #define FF_MB_DECISION_RD 2 ///< rate distortion
1783 * custom intra quantization matrix
1784 * - encoding: Set by user, can be NULL.
1785 * - decoding: Set by libavcodec.
1787 uint16_t *intra_matrix;
1790 * custom inter quantization matrix
1791 * - encoding: Set by user, can be NULL.
1792 * - decoding: Set by libavcodec.
1794 uint16_t *inter_matrix;
1797 * scene change detection threshold
1798 * 0 is default, larger means fewer detected scene changes.
1799 * - encoding: Set by user.
1800 * - decoding: unused
1802 int scenechange_threshold;
1805 * noise reduction strength
1806 * - encoding: Set by user.
1807 * - decoding: unused
1809 int noise_reduction;
1813 * @deprecated this field is unused
1815 attribute_deprecated
1819 * @deprecated this field is unused
1821 attribute_deprecated
1826 * precision of the intra DC coefficient - 8
1827 * - encoding: Set by user.
1828 * - decoding: Set by libavcodec
1830 int intra_dc_precision;
1833 * Number of macroblock rows at the top which are skipped.
1834 * - encoding: unused
1835 * - decoding: Set by user.
1840 * Number of macroblock rows at the bottom which are skipped.
1841 * - encoding: unused
1842 * - decoding: Set by user.
1848 * @deprecated use encoder private options instead
1850 attribute_deprecated
1851 float border_masking;
1855 * minimum MB lagrange multipler
1856 * - encoding: Set by user.
1857 * - decoding: unused
1862 * maximum MB lagrange multipler
1863 * - encoding: Set by user.
1864 * - decoding: unused
1870 * - encoding: Set by user.
1871 * - decoding: unused
1873 int me_penalty_compensation;
1877 * - encoding: Set by user.
1878 * - decoding: unused
1884 * - encoding: Set by user.
1885 * - decoding: unused
1891 * - encoding: Set by user.
1892 * - decoding: unused
1897 * number of reference frames
1898 * - encoding: Set by user.
1899 * - decoding: Set by lavc.
1904 * chroma qp offset from luma
1905 * - encoding: Set by user.
1906 * - decoding: unused
1910 #if FF_API_UNUSED_MEMBERS
1912 * Multiplied by qscale for each frame and added to scene_change_score.
1913 * - encoding: Set by user.
1914 * - decoding: unused
1916 attribute_deprecated int scenechange_factor;
1921 * Note: Value depends upon the compare function used for fullpel ME.
1922 * - encoding: Set by user.
1923 * - decoding: unused
1928 * Adjust sensitivity of b_frame_strategy 1.
1929 * - encoding: Set by user.
1930 * - decoding: unused
1935 * Chromaticity coordinates of the source primaries.
1936 * - encoding: Set by user
1937 * - decoding: Set by libavcodec
1939 enum AVColorPrimaries color_primaries;
1942 * Color Transfer Characteristic.
1943 * - encoding: Set by user
1944 * - decoding: Set by libavcodec
1946 enum AVColorTransferCharacteristic color_trc;
1949 * YUV colorspace type.
1950 * - encoding: Set by user
1951 * - decoding: Set by libavcodec
1953 enum AVColorSpace colorspace;
1956 * MPEG vs JPEG YUV range.
1957 * - encoding: Set by user
1958 * - decoding: Set by libavcodec
1960 enum AVColorRange color_range;
1963 * This defines the location of chroma samples.
1964 * - encoding: Set by user
1965 * - decoding: Set by libavcodec
1967 enum AVChromaLocation chroma_sample_location;
1971 * Indicates number of picture subdivisions. Used for parallelized
1973 * - encoding: Set by user
1974 * - decoding: unused
1979 * - encoding: set by libavcodec
1980 * - decoding: Set by user.
1982 enum AVFieldOrder field_order;
1985 int sample_rate; ///< samples per second
1986 int channels; ///< number of audio channels
1989 * audio sample format
1990 * - encoding: Set by user.
1991 * - decoding: Set by libavcodec.
1993 enum AVSampleFormat sample_fmt; ///< sample format
1995 /* The following data should not be initialized. */
1997 * Number of samples per channel in an audio frame.
1999 * - encoding: set by libavcodec in avcodec_open2(). Each submitted frame
2000 * except the last must contain exactly frame_size samples per channel.
2001 * May be 0 when the codec has CODEC_CAP_VARIABLE_FRAME_SIZE set, then the
2002 * frame size is not restricted.
2003 * - decoding: may be set by some decoders to indicate constant frame size
2008 * Frame counter, set by libavcodec.
2010 * - decoding: total number of frames returned from the decoder so far.
2011 * - encoding: total number of frames passed to the encoder so far.
2013 * @note the counter is not incremented if encoding/decoding resulted in
2019 * number of bytes per packet if constant and known or 0
2020 * Used by some WAV based audio codecs.
2025 * Audio cutoff bandwidth (0 means "automatic")
2026 * - encoding: Set by user.
2027 * - decoding: unused
2031 #if FF_API_REQUEST_CHANNELS
2033 * Decoder should decode to this many channels if it can (0 for default)
2034 * - encoding: unused
2035 * - decoding: Set by user.
2036 * @deprecated Deprecated in favor of request_channel_layout.
2038 attribute_deprecated int request_channels;
2042 * Audio channel layout.
2043 * - encoding: set by user.
2044 * - decoding: set by user, may be overwritten by libavcodec.
2046 uint64_t channel_layout;
2049 * Request decoder to use this channel layout if it can (0 for default)
2050 * - encoding: unused
2051 * - decoding: Set by user.
2053 uint64_t request_channel_layout;
2056 * Type of service that the audio stream conveys.
2057 * - encoding: Set by user.
2058 * - decoding: Set by libavcodec.
2060 enum AVAudioServiceType audio_service_type;
2063 * desired sample format
2064 * - encoding: Not used.
2065 * - decoding: Set by user.
2066 * Decoder will decode to this format if it can.
2068 enum AVSampleFormat request_sample_fmt;
2070 #if FF_API_GET_BUFFER
2072 * Called at the beginning of each frame to get a buffer for it.
2074 * The function will set AVFrame.data[], AVFrame.linesize[].
2075 * AVFrame.extended_data[] must also be set, but it should be the same as
2076 * AVFrame.data[] except for planar audio with more channels than can fit
2077 * in AVFrame.data[]. In that case, AVFrame.data[] shall still contain as
2078 * many data pointers as it can hold.
2080 * if CODEC_CAP_DR1 is not set then get_buffer() must call
2081 * avcodec_default_get_buffer() instead of providing buffers allocated by
2084 * AVFrame.data[] should be 32- or 16-byte-aligned unless the CPU doesn't
2085 * need it. avcodec_default_get_buffer() aligns the output buffer properly,
2086 * but if get_buffer() is overridden then alignment considerations should
2087 * be taken into account.
2089 * @see avcodec_default_get_buffer()
2093 * If pic.reference is set then the frame will be read later by libavcodec.
2094 * avcodec_align_dimensions2() should be used to find the required width and
2095 * height, as they normally need to be rounded up to the next multiple of 16.
2097 * If frame multithreading is used and thread_safe_callbacks is set,
2098 * it may be called from a different thread, but not from more than one at
2099 * once. Does not need to be reentrant.
2101 * @see release_buffer(), reget_buffer()
2102 * @see avcodec_align_dimensions2()
2106 * Decoders request a buffer of a particular size by setting
2107 * AVFrame.nb_samples prior to calling get_buffer(). The decoder may,
2108 * however, utilize only part of the buffer by setting AVFrame.nb_samples
2109 * to a smaller value in the output frame.
2111 * Decoders cannot use the buffer after returning from
2112 * avcodec_decode_audio4(), so they will not call release_buffer(), as it
2113 * is assumed to be released immediately upon return. In some rare cases,
2114 * a decoder may need to call get_buffer() more than once in a single
2115 * call to avcodec_decode_audio4(). In that case, when get_buffer() is
2116 * called again after it has already been called once, the previously
2117 * acquired buffer is assumed to be released at that time and may not be
2118 * reused by the decoder.
2120 * As a convenience, av_samples_get_buffer_size() and
2121 * av_samples_fill_arrays() in libavutil may be used by custom get_buffer()
2122 * functions to find the required data size and to fill data pointers and
2123 * linesize. In AVFrame.linesize, only linesize[0] may be set for audio
2124 * since all planes must be the same size.
2126 * @see av_samples_get_buffer_size(), av_samples_fill_arrays()
2128 * - encoding: unused
2129 * - decoding: Set by libavcodec, user can override.
2131 * @deprecated use get_buffer2()
2133 attribute_deprecated
2134 int (*get_buffer)(struct AVCodecContext *c, AVFrame *pic);
2137 * Called to release buffers which were allocated with get_buffer.
2138 * A released buffer can be reused in get_buffer().
2139 * pic.data[*] must be set to NULL.
2140 * May be called from a different thread if frame multithreading is used,
2141 * but not by more than one thread at once, so does not need to be reentrant.
2142 * - encoding: unused
2143 * - decoding: Set by libavcodec, user can override.
2145 * @deprecated custom freeing callbacks should be set from get_buffer2()
2147 attribute_deprecated
2148 void (*release_buffer)(struct AVCodecContext *c, AVFrame *pic);
2151 * Called at the beginning of a frame to get cr buffer for it.
2152 * Buffer type (size, hints) must be the same. libavcodec won't check it.
2153 * libavcodec will pass previous buffer in pic, function should return
2154 * same buffer or new buffer with old frame "painted" into it.
2155 * If pic.data[0] == NULL must behave like get_buffer().
2156 * if CODEC_CAP_DR1 is not set then reget_buffer() must call
2157 * avcodec_default_reget_buffer() instead of providing buffers allocated by
2159 * - encoding: unused
2160 * - decoding: Set by libavcodec, user can override.
2162 attribute_deprecated
2163 int (*reget_buffer)(struct AVCodecContext *c, AVFrame *pic);
2167 * This callback is called at the beginning of each frame to get data
2168 * buffer(s) for it. There may be one contiguous buffer for all the data or
2169 * there may be a buffer per each data plane or anything in between. What
2170 * this means is, you may set however many entries in buf[] you feel necessary.
2171 * Each buffer must be reference-counted using the AVBuffer API (see description
2174 * The following fields will be set in the frame before this callback is
2177 * - width, height (video only)
2178 * - sample_rate, channel_layout, nb_samples (audio only)
2179 * Their values may differ from the corresponding values in
2180 * AVCodecContext. This callback must use the frame values, not the codec
2181 * context values, to calculate the required buffer size.
2183 * This callback must fill the following fields in the frame:
2187 * * if the data is planar audio with more than 8 channels, then this
2188 * callback must allocate and fill extended_data to contain all pointers
2189 * to all data planes. data[] must hold as many pointers as it can.
2190 * extended_data must be allocated with av_malloc() and will be freed in
2192 * * otherwise exended_data must point to data
2193 * - buf[] must contain one or more pointers to AVBufferRef structures. Each of
2194 * the frame's data and extended_data pointers must be contained in these. That
2195 * is, one AVBufferRef for each allocated chunk of memory, not necessarily one
2196 * AVBufferRef per data[] entry. See: av_buffer_create(), av_buffer_alloc(),
2197 * and av_buffer_ref().
2198 * - extended_buf and nb_extended_buf must be allocated with av_malloc() by
2199 * this callback and filled with the extra buffers if there are more
2200 * buffers than buf[] can hold. extended_buf will be freed in
2203 * If CODEC_CAP_DR1 is not set then get_buffer2() must call
2204 * avcodec_default_get_buffer2() instead of providing buffers allocated by
2207 * Each data plane must be aligned to the maximum required by the target
2210 * @see avcodec_default_get_buffer2()
2214 * If AV_GET_BUFFER_FLAG_REF is set in flags then the frame may be reused
2215 * (read and/or written to if it is writable) later by libavcodec.
2217 * avcodec_align_dimensions2() should be used to find the required width and
2218 * height, as they normally need to be rounded up to the next multiple of 16.
2220 * Some decoders do not support linesizes changing between frames.
2222 * If frame multithreading is used and thread_safe_callbacks is set,
2223 * this callback may be called from a different thread, but not from more
2224 * than one at once. Does not need to be reentrant.
2226 * @see avcodec_align_dimensions2()
2230 * Decoders request a buffer of a particular size by setting
2231 * AVFrame.nb_samples prior to calling get_buffer2(). The decoder may,
2232 * however, utilize only part of the buffer by setting AVFrame.nb_samples
2233 * to a smaller value in the output frame.
2235 * As a convenience, av_samples_get_buffer_size() and
2236 * av_samples_fill_arrays() in libavutil may be used by custom get_buffer2()
2237 * functions to find the required data size and to fill data pointers and
2238 * linesize. In AVFrame.linesize, only linesize[0] may be set for audio
2239 * since all planes must be the same size.
2241 * @see av_samples_get_buffer_size(), av_samples_fill_arrays()
2243 * - encoding: unused
2244 * - decoding: Set by libavcodec, user can override.
2246 int (*get_buffer2)(struct AVCodecContext *s, AVFrame *frame, int flags);
2249 * If non-zero, the decoded audio and video frames returned from
2250 * avcodec_decode_video2() and avcodec_decode_audio4() are reference-counted
2251 * and are valid indefinitely. The caller must free them with
2252 * av_frame_unref() when they are not needed anymore.
2253 * Otherwise, the decoded frames must not be freed by the caller and are
2254 * only valid until the next decode call.
2256 * - encoding: unused
2257 * - decoding: set by the caller before avcodec_open2().
2259 int refcounted_frames;
2261 /* - encoding parameters */
2262 float qcompress; ///< amount of qscale change between easy & hard scenes (0.0-1.0)
2263 float qblur; ///< amount of qscale smoothing over time (0.0-1.0)
2267 * - encoding: Set by user.
2268 * - decoding: unused
2274 * - encoding: Set by user.
2275 * - decoding: unused
2280 * maximum quantizer difference between frames
2281 * - encoding: Set by user.
2282 * - decoding: unused
2288 * @deprecated use encoder private options instead
2290 attribute_deprecated
2293 attribute_deprecated
2295 attribute_deprecated
2300 * decoder bitstream buffer size
2301 * - encoding: Set by user.
2302 * - decoding: unused
2307 * ratecontrol override, see RcOverride
2308 * - encoding: Allocated/set/freed by user.
2309 * - decoding: unused
2311 int rc_override_count;
2312 RcOverride *rc_override;
2316 * @deprecated use encoder private options instead
2318 attribute_deprecated
2324 * - encoding: Set by user.
2325 * - decoding: Set by libavcodec.
2331 * - encoding: Set by user.
2332 * - decoding: unused
2338 * @deprecated use encoder private options instead
2340 attribute_deprecated
2341 float rc_buffer_aggressivity;
2343 attribute_deprecated
2344 float rc_initial_cplx;
2348 * Ratecontrol attempt to use, at maximum, <value> of what can be used without an underflow.
2349 * - encoding: Set by user.
2350 * - decoding: unused.
2352 float rc_max_available_vbv_use;
2355 * Ratecontrol attempt to use, at least, <value> times the amount needed to prevent a vbv overflow.
2356 * - encoding: Set by user.
2357 * - decoding: unused.
2359 float rc_min_vbv_overflow_use;
2362 * Number of bits which should be loaded into the rc buffer before decoding starts.
2363 * - encoding: Set by user.
2364 * - decoding: unused
2366 int rc_initial_buffer_occupancy;
2368 #define FF_CODER_TYPE_VLC 0
2369 #define FF_CODER_TYPE_AC 1
2370 #define FF_CODER_TYPE_RAW 2
2371 #define FF_CODER_TYPE_RLE 3
2372 #if FF_API_UNUSED_MEMBERS
2373 #define FF_CODER_TYPE_DEFLATE 4
2374 #endif /* FF_API_UNUSED_MEMBERS */
2377 * - encoding: Set by user.
2378 * - decoding: unused
2384 * - encoding: Set by user.
2385 * - decoding: unused
2391 * @deprecated use encoder private options instead
2393 attribute_deprecated
2397 * @deprecated use encoder private options instead
2399 attribute_deprecated
2404 * frame skip threshold
2405 * - encoding: Set by user.
2406 * - decoding: unused
2408 int frame_skip_threshold;
2412 * - encoding: Set by user.
2413 * - decoding: unused
2415 int frame_skip_factor;
2418 * frame skip exponent
2419 * - encoding: Set by user.
2420 * - decoding: unused
2425 * frame skip comparison function
2426 * - encoding: Set by user.
2427 * - decoding: unused
2432 * trellis RD quantization
2433 * - encoding: Set by user.
2434 * - decoding: unused
2439 * - encoding: Set by user.
2440 * - decoding: unused
2442 int min_prediction_order;
2445 * - encoding: Set by user.
2446 * - decoding: unused
2448 int max_prediction_order;
2451 * GOP timecode frame start number
2452 * - encoding: Set by user, in non drop frame format
2453 * - decoding: Set by libavcodec (timecode in the 25 bits format, -1 if unset)
2455 int64_t timecode_frame_start;
2457 /* The RTP callback: This function is called */
2458 /* every time the encoder has a packet to send. */
2459 /* It depends on the encoder if the data starts */
2460 /* with a Start Code (it should). H.263 does. */
2461 /* mb_nb contains the number of macroblocks */
2462 /* encoded in the RTP payload. */
2463 void (*rtp_callback)(struct AVCodecContext *avctx, void *data, int size, int mb_nb);
2465 int rtp_payload_size; /* The size of the RTP payload: the coder will */
2466 /* do its best to deliver a chunk with size */
2467 /* below rtp_payload_size, the chunk will start */
2468 /* with a start code on some codecs like H.263. */
2469 /* This doesn't take account of any particular */
2470 /* headers inside the transmitted RTP payload. */
2472 /* statistics, used for 2-pass encoding */
2483 * number of bits used for the previously encoded frame
2484 * - encoding: Set by libavcodec.
2485 * - decoding: unused
2490 * pass1 encoding statistics output buffer
2491 * - encoding: Set by libavcodec.
2492 * - decoding: unused
2497 * pass2 encoding statistics input buffer
2498 * Concatenated stuff from stats_out of pass1 should be placed here.
2499 * - encoding: Allocated/set/freed by user.
2500 * - decoding: unused
2505 * Work around bugs in encoders which sometimes cannot be detected automatically.
2506 * - encoding: Set by user
2507 * - decoding: Set by user
2509 int workaround_bugs;
2510 #define FF_BUG_AUTODETECT 1 ///< autodetection
2511 #if FF_API_OLD_MSMPEG4
2512 #define FF_BUG_OLD_MSMPEG4 2
2514 #define FF_BUG_XVID_ILACE 4
2515 #define FF_BUG_UMP4 8
2516 #define FF_BUG_NO_PADDING 16
2517 #define FF_BUG_AMV 32
2519 #define FF_BUG_AC_VLC 0 ///< Will be removed, libavcodec can now handle these non-compliant files by default.
2521 #define FF_BUG_QPEL_CHROMA 64
2522 #define FF_BUG_STD_QPEL 128
2523 #define FF_BUG_QPEL_CHROMA2 256
2524 #define FF_BUG_DIRECT_BLOCKSIZE 512
2525 #define FF_BUG_EDGE 1024
2526 #define FF_BUG_HPEL_CHROMA 2048
2527 #define FF_BUG_DC_CLIP 4096
2528 #define FF_BUG_MS 8192 ///< Work around various bugs in Microsoft's broken decoders.
2529 #define FF_BUG_TRUNCATED 16384
2532 * strictly follow the standard (MPEG4, ...).
2533 * - encoding: Set by user.
2534 * - decoding: Set by user.
2535 * Setting this to STRICT or higher means the encoder and decoder will
2536 * generally do stupid things, whereas setting it to unofficial or lower
2537 * will mean the encoder might produce output that is not supported by all
2538 * spec-compliant decoders. Decoders don't differentiate between normal,
2539 * unofficial and experimental (that is, they always try to decode things
2540 * when they can) unless they are explicitly asked to behave stupidly
2541 * (=strictly conform to the specs)
2543 int strict_std_compliance;
2544 #define FF_COMPLIANCE_VERY_STRICT 2 ///< Strictly conform to an older more strict version of the spec or reference software.
2545 #define FF_COMPLIANCE_STRICT 1 ///< Strictly conform to all the things in the spec no matter what consequences.
2546 #define FF_COMPLIANCE_NORMAL 0
2547 #define FF_COMPLIANCE_UNOFFICIAL -1 ///< Allow unofficial extensions
2548 #define FF_COMPLIANCE_EXPERIMENTAL -2 ///< Allow nonstandardized experimental things.
2551 * error concealment flags
2552 * - encoding: unused
2553 * - decoding: Set by user.
2555 int error_concealment;
2556 #define FF_EC_GUESS_MVS 1
2557 #define FF_EC_DEBLOCK 2
2558 #define FF_EC_FAVOR_INTER 256
2562 * - encoding: Set by user.
2563 * - decoding: Set by user.
2566 #define FF_DEBUG_PICT_INFO 1
2567 #define FF_DEBUG_RC 2
2568 #define FF_DEBUG_BITSTREAM 4
2569 #define FF_DEBUG_MB_TYPE 8
2570 #define FF_DEBUG_QP 16
2573 * @deprecated this option does nothing
2575 #define FF_DEBUG_MV 32
2577 #define FF_DEBUG_DCT_COEFF 0x00000040
2578 #define FF_DEBUG_SKIP 0x00000080
2579 #define FF_DEBUG_STARTCODE 0x00000100
2580 #if FF_API_UNUSED_MEMBERS
2581 #define FF_DEBUG_PTS 0x00000200
2582 #endif /* FF_API_UNUSED_MEMBERS */
2583 #define FF_DEBUG_ER 0x00000400
2584 #define FF_DEBUG_MMCO 0x00000800
2585 #define FF_DEBUG_BUGS 0x00001000
2587 #define FF_DEBUG_VIS_QP 0x00002000 ///< only access through AVOptions from outside libavcodec
2588 #define FF_DEBUG_VIS_MB_TYPE 0x00004000 ///< only access through AVOptions from outside libavcodec
2590 #define FF_DEBUG_BUFFERS 0x00008000
2591 #define FF_DEBUG_THREADS 0x00010000
2592 #define FF_DEBUG_NOMC 0x01000000
2597 * Code outside libavcodec should access this field using AVOptions
2598 * - encoding: Set by user.
2599 * - decoding: Set by user.
2602 #define FF_DEBUG_VIS_MV_P_FOR 0x00000001 //visualize forward predicted MVs of P frames
2603 #define FF_DEBUG_VIS_MV_B_FOR 0x00000002 //visualize forward predicted MVs of B frames
2604 #define FF_DEBUG_VIS_MV_B_BACK 0x00000004 //visualize backward predicted MVs of B frames
2608 * Error recognition; may misdetect some more or less valid parts as errors.
2609 * - encoding: unused
2610 * - decoding: Set by user.
2612 int err_recognition;
2615 * Verify checksums embedded in the bitstream (could be of either encoded or
2616 * decoded data, depending on the codec) and print an error message on mismatch.
2617 * If AV_EF_EXPLODE is also set, a mismatching checksum will result in the
2618 * decoder returning an error.
2620 #define AV_EF_CRCCHECK (1<<0)
2621 #define AV_EF_BITSTREAM (1<<1) ///< detect bitstream specification deviations
2622 #define AV_EF_BUFFER (1<<2) ///< detect improper bitstream length
2623 #define AV_EF_EXPLODE (1<<3) ///< abort decoding on minor error detection
2625 #define AV_EF_IGNORE_ERR (1<<15) ///< ignore errors and continue
2626 #define AV_EF_CAREFUL (1<<16) ///< consider things that violate the spec, are fast to calculate and have not been seen in the wild as errors
2627 #define AV_EF_COMPLIANT (1<<17) ///< consider all spec non compliances as errors
2628 #define AV_EF_AGGRESSIVE (1<<18) ///< consider things that a sane encoder should not do as an error
2632 * opaque 64bit number (generally a PTS) that will be reordered and
2633 * output in AVFrame.reordered_opaque
2634 * - encoding: unused
2635 * - decoding: Set by user.
2637 int64_t reordered_opaque;
2640 * Hardware accelerator in use
2641 * - encoding: unused.
2642 * - decoding: Set by libavcodec
2644 struct AVHWAccel *hwaccel;
2647 * Hardware accelerator context.
2648 * For some hardware accelerators, a global context needs to be
2649 * provided by the user. In that case, this holds display-dependent
2650 * data FFmpeg cannot instantiate itself. Please refer to the
2651 * FFmpeg HW accelerator documentation to know how to fill this
2652 * is. e.g. for VA API, this is a struct vaapi_context.
2653 * - encoding: unused
2654 * - decoding: Set by user
2656 void *hwaccel_context;
2660 * - encoding: Set by libavcodec if flags&CODEC_FLAG_PSNR.
2661 * - decoding: unused
2663 uint64_t error[AV_NUM_DATA_POINTERS];
2666 * DCT algorithm, see FF_DCT_* below
2667 * - encoding: Set by user.
2668 * - decoding: unused
2671 #define FF_DCT_AUTO 0
2672 #define FF_DCT_FASTINT 1
2673 #if FF_API_UNUSED_MEMBERS
2674 #define FF_DCT_INT 2
2675 #endif /* FF_API_UNUSED_MEMBERS */
2676 #define FF_DCT_MMX 3
2677 #define FF_DCT_ALTIVEC 5
2678 #define FF_DCT_FAAN 6
2681 * IDCT algorithm, see FF_IDCT_* below.
2682 * - encoding: Set by user.
2683 * - decoding: Set by user.
2686 #define FF_IDCT_AUTO 0
2687 #define FF_IDCT_INT 1
2688 #define FF_IDCT_SIMPLE 2
2689 #define FF_IDCT_SIMPLEMMX 3
2690 #define FF_IDCT_ARM 7
2691 #define FF_IDCT_ALTIVEC 8
2693 #define FF_IDCT_SH4 9
2695 #define FF_IDCT_SIMPLEARM 10
2696 #if FF_API_UNUSED_MEMBERS
2697 #define FF_IDCT_IPP 13
2698 #endif /* FF_API_UNUSED_MEMBERS */
2699 #define FF_IDCT_XVID 14
2700 #if FF_API_IDCT_XVIDMMX
2701 #define FF_IDCT_XVIDMMX 14
2702 #endif /* FF_API_IDCT_XVIDMMX */
2703 #define FF_IDCT_SIMPLEARMV5TE 16
2704 #define FF_IDCT_SIMPLEARMV6 17
2705 #if FF_API_ARCH_SPARC
2706 #define FF_IDCT_SIMPLEVIS 18
2708 #define FF_IDCT_FAAN 20
2709 #define FF_IDCT_SIMPLENEON 22
2710 #if FF_API_ARCH_ALPHA
2711 #define FF_IDCT_SIMPLEALPHA 23
2713 #define FF_IDCT_SIMPLEAUTO 128
2716 * bits per sample/pixel from the demuxer (needed for huffyuv).
2717 * - encoding: Set by libavcodec.
2718 * - decoding: Set by user.
2720 int bits_per_coded_sample;
2723 * Bits per sample/pixel of internal libavcodec pixel/sample format.
2724 * - encoding: set by user.
2725 * - decoding: set by libavcodec.
2727 int bits_per_raw_sample;
2731 * low resolution decoding, 1-> 1/2 size, 2->1/4 size
2732 * - encoding: unused
2733 * - decoding: Set by user.
2734 * Code outside libavcodec should access this field using:
2735 * av_codec_{get,set}_lowres(avctx)
2741 * the picture in the bitstream
2742 * - encoding: Set by libavcodec.
2743 * - decoding: unused
2745 AVFrame *coded_frame;
2749 * is used to decide how many independent tasks should be passed to execute()
2750 * - encoding: Set by user.
2751 * - decoding: Set by user.
2756 * Which multithreading methods to use.
2757 * Use of FF_THREAD_FRAME will increase decoding delay by one frame per thread,
2758 * so clients which cannot provide future frames should not use it.
2760 * - encoding: Set by user, otherwise the default is used.
2761 * - decoding: Set by user, otherwise the default is used.
2764 #define FF_THREAD_FRAME 1 ///< Decode more than one frame at once
2765 #define FF_THREAD_SLICE 2 ///< Decode more than one part of a single frame at once
2768 * Which multithreading methods are in use by the codec.
2769 * - encoding: Set by libavcodec.
2770 * - decoding: Set by libavcodec.
2772 int active_thread_type;
2775 * Set by the client if its custom get_buffer() callback can be called
2776 * synchronously from another thread, which allows faster multithreaded decoding.
2777 * draw_horiz_band() will be called from other threads regardless of this setting.
2778 * Ignored if the default get_buffer() is used.
2779 * - encoding: Set by user.
2780 * - decoding: Set by user.
2782 int thread_safe_callbacks;
2785 * The codec may call this to execute several independent things.
2786 * It will return only after finishing all tasks.
2787 * The user may replace this with some multithreaded implementation,
2788 * the default implementation will execute the parts serially.
2789 * @param count the number of things to execute
2790 * - encoding: Set by libavcodec, user can override.
2791 * - decoding: Set by libavcodec, user can override.
2793 int (*execute)(struct AVCodecContext *c, int (*func)(struct AVCodecContext *c2, void *arg), void *arg2, int *ret, int count, int size);
2796 * The codec may call this to execute several independent things.
2797 * It will return only after finishing all tasks.
2798 * The user may replace this with some multithreaded implementation,
2799 * the default implementation will execute the parts serially.
2800 * Also see avcodec_thread_init and e.g. the --enable-pthread configure option.
2801 * @param c context passed also to func
2802 * @param count the number of things to execute
2803 * @param arg2 argument passed unchanged to func
2804 * @param ret return values of executed functions, must have space for "count" values. May be NULL.
2805 * @param func function that will be called count times, with jobnr from 0 to count-1.
2806 * threadnr will be in the range 0 to c->thread_count-1 < MAX_THREADS and so that no
2807 * two instances of func executing at the same time will have the same threadnr.
2808 * @return always 0 currently, but code should handle a future improvement where when any call to func
2809 * returns < 0 no further calls to func may be done and < 0 is returned.
2810 * - encoding: Set by libavcodec, user can override.
2811 * - decoding: Set by libavcodec, user can override.
2813 int (*execute2)(struct AVCodecContext *c, int (*func)(struct AVCodecContext *c2, void *arg, int jobnr, int threadnr), void *arg2, int *ret, int count);
2815 #if FF_API_THREAD_OPAQUE
2817 * @deprecated this field should not be used from outside of lavc
2819 attribute_deprecated
2820 void *thread_opaque;
2824 * noise vs. sse weight for the nsse comparison function
2825 * - encoding: Set by user.
2826 * - decoding: unused
2832 * - encoding: Set by user.
2833 * - decoding: Set by libavcodec.
2836 #define FF_PROFILE_UNKNOWN -99
2837 #define FF_PROFILE_RESERVED -100
2839 #define FF_PROFILE_AAC_MAIN 0
2840 #define FF_PROFILE_AAC_LOW 1
2841 #define FF_PROFILE_AAC_SSR 2
2842 #define FF_PROFILE_AAC_LTP 3
2843 #define FF_PROFILE_AAC_HE 4
2844 #define FF_PROFILE_AAC_HE_V2 28
2845 #define FF_PROFILE_AAC_LD 22
2846 #define FF_PROFILE_AAC_ELD 38
2847 #define FF_PROFILE_MPEG2_AAC_LOW 128
2848 #define FF_PROFILE_MPEG2_AAC_HE 131
2850 #define FF_PROFILE_DTS 20
2851 #define FF_PROFILE_DTS_ES 30
2852 #define FF_PROFILE_DTS_96_24 40
2853 #define FF_PROFILE_DTS_HD_HRA 50
2854 #define FF_PROFILE_DTS_HD_MA 60
2855 #define FF_PROFILE_DTS_EXPRESS 70
2857 #define FF_PROFILE_MPEG2_422 0
2858 #define FF_PROFILE_MPEG2_HIGH 1
2859 #define FF_PROFILE_MPEG2_SS 2
2860 #define FF_PROFILE_MPEG2_SNR_SCALABLE 3
2861 #define FF_PROFILE_MPEG2_MAIN 4
2862 #define FF_PROFILE_MPEG2_SIMPLE 5
2864 #define FF_PROFILE_H264_CONSTRAINED (1<<9) // 8+1; constraint_set1_flag
2865 #define FF_PROFILE_H264_INTRA (1<<11) // 8+3; constraint_set3_flag
2867 #define FF_PROFILE_H264_BASELINE 66
2868 #define FF_PROFILE_H264_CONSTRAINED_BASELINE (66|FF_PROFILE_H264_CONSTRAINED)
2869 #define FF_PROFILE_H264_MAIN 77
2870 #define FF_PROFILE_H264_EXTENDED 88
2871 #define FF_PROFILE_H264_HIGH 100
2872 #define FF_PROFILE_H264_HIGH_10 110
2873 #define FF_PROFILE_H264_HIGH_10_INTRA (110|FF_PROFILE_H264_INTRA)
2874 #define FF_PROFILE_H264_HIGH_422 122
2875 #define FF_PROFILE_H264_HIGH_422_INTRA (122|FF_PROFILE_H264_INTRA)
2876 #define FF_PROFILE_H264_HIGH_444 144
2877 #define FF_PROFILE_H264_HIGH_444_PREDICTIVE 244
2878 #define FF_PROFILE_H264_HIGH_444_INTRA (244|FF_PROFILE_H264_INTRA)
2879 #define FF_PROFILE_H264_CAVLC_444 44
2881 #define FF_PROFILE_VC1_SIMPLE 0
2882 #define FF_PROFILE_VC1_MAIN 1
2883 #define FF_PROFILE_VC1_COMPLEX 2
2884 #define FF_PROFILE_VC1_ADVANCED 3
2886 #define FF_PROFILE_MPEG4_SIMPLE 0
2887 #define FF_PROFILE_MPEG4_SIMPLE_SCALABLE 1
2888 #define FF_PROFILE_MPEG4_CORE 2
2889 #define FF_PROFILE_MPEG4_MAIN 3
2890 #define FF_PROFILE_MPEG4_N_BIT 4
2891 #define FF_PROFILE_MPEG4_SCALABLE_TEXTURE 5
2892 #define FF_PROFILE_MPEG4_SIMPLE_FACE_ANIMATION 6
2893 #define FF_PROFILE_MPEG4_BASIC_ANIMATED_TEXTURE 7
2894 #define FF_PROFILE_MPEG4_HYBRID 8
2895 #define FF_PROFILE_MPEG4_ADVANCED_REAL_TIME 9
2896 #define FF_PROFILE_MPEG4_CORE_SCALABLE 10
2897 #define FF_PROFILE_MPEG4_ADVANCED_CODING 11
2898 #define FF_PROFILE_MPEG4_ADVANCED_CORE 12
2899 #define FF_PROFILE_MPEG4_ADVANCED_SCALABLE_TEXTURE 13
2900 #define FF_PROFILE_MPEG4_SIMPLE_STUDIO 14
2901 #define FF_PROFILE_MPEG4_ADVANCED_SIMPLE 15
2903 #define FF_PROFILE_JPEG2000_CSTREAM_RESTRICTION_0 0
2904 #define FF_PROFILE_JPEG2000_CSTREAM_RESTRICTION_1 1
2905 #define FF_PROFILE_JPEG2000_CSTREAM_NO_RESTRICTION 2
2906 #define FF_PROFILE_JPEG2000_DCINEMA_2K 3
2907 #define FF_PROFILE_JPEG2000_DCINEMA_4K 4
2910 #define FF_PROFILE_HEVC_MAIN 1
2911 #define FF_PROFILE_HEVC_MAIN_10 2
2912 #define FF_PROFILE_HEVC_MAIN_STILL_PICTURE 3
2913 #define FF_PROFILE_HEVC_REXT 4
2915 #define FF_PROFILE_VP9_0 0
2916 #define FF_PROFILE_VP9_1 1
2917 #define FF_PROFILE_VP9_2 2
2918 #define FF_PROFILE_VP9_3 3
2922 * - encoding: Set by user.
2923 * - decoding: Set by libavcodec.
2926 #define FF_LEVEL_UNKNOWN -99
2929 * Skip loop filtering for selected frames.
2930 * - encoding: unused
2931 * - decoding: Set by user.
2933 enum AVDiscard skip_loop_filter;
2936 * Skip IDCT/dequantization for selected frames.
2937 * - encoding: unused
2938 * - decoding: Set by user.
2940 enum AVDiscard skip_idct;
2943 * Skip decoding for selected frames.
2944 * - encoding: unused
2945 * - decoding: Set by user.
2947 enum AVDiscard skip_frame;
2950 * Header containing style information for text subtitles.
2951 * For SUBTITLE_ASS subtitle type, it should contain the whole ASS
2952 * [Script Info] and [V4+ Styles] section, plus the [Events] line and
2953 * the Format line following. It shouldn't include any Dialogue line.
2954 * - encoding: Set/allocated/freed by user (before avcodec_open2())
2955 * - decoding: Set/allocated/freed by libavcodec (by avcodec_open2())
2957 uint8_t *subtitle_header;
2958 int subtitle_header_size;
2960 #if FF_API_ERROR_RATE
2962 * @deprecated use the 'error_rate' private AVOption of the mpegvideo
2965 attribute_deprecated
2969 #if FF_API_CODEC_PKT
2971 * @deprecated this field is not supposed to be accessed from outside lavc
2973 attribute_deprecated
2978 * VBV delay coded in the last frame (in periods of a 27 MHz clock).
2979 * Used for compliant TS muxing.
2980 * - encoding: Set by libavcodec.
2981 * - decoding: unused.
2986 * Encoding only. Allow encoders to output packets that do not contain any
2987 * encoded data, only side data.
2989 * Some encoders need to output such packets, e.g. to update some stream
2990 * parameters at the end of encoding.
2992 * All callers are strongly recommended to set this option to 1 and update
2993 * their code to deal with such packets, since this behaviour may become
2994 * always enabled in the future (then this option will be deprecated and
2995 * later removed). To avoid ABI issues when this happens, the callers should
2996 * use AVOptions to set this field.
2998 int side_data_only_packets;
3001 * Audio only. The number of "priming" samples (padding) inserted by the
3002 * encoder at the beginning of the audio. I.e. this number of leading
3003 * decoded samples must be discarded by the caller to get the original audio
3004 * without leading padding.
3006 * - decoding: unused
3007 * - encoding: Set by libavcodec. The timestamps on the output packets are
3008 * adjusted by the encoder so that they always refer to the
3009 * first sample of the data actually contained in the packet,
3010 * including any added padding. E.g. if the timebase is
3011 * 1/samplerate and the timestamp of the first input sample is
3012 * 0, the timestamp of the first output packet will be
3015 int initial_padding;
3018 * - decoding: For codecs that store a framerate value in the compressed
3019 * bitstream, the decoder may export it here. { 0, 1} when
3021 * - encoding: unused
3023 AVRational framerate;
3026 * Nominal unaccelerated pixel format, see AV_PIX_FMT_xxx.
3027 * - encoding: unused.
3028 * - decoding: Set by libavcodec before calling get_format()
3030 enum AVPixelFormat sw_pix_fmt;
3033 * Timebase in which pkt_dts/pts and AVPacket.dts/pts are.
3034 * Code outside libavcodec should access this field using:
3035 * av_codec_{get,set}_pkt_timebase(avctx)
3036 * - encoding unused.
3037 * - decoding set by user.
3039 AVRational pkt_timebase;
3043 * Code outside libavcodec should access this field using:
3044 * av_codec_{get,set}_codec_descriptor(avctx)
3045 * - encoding: unused.
3046 * - decoding: set by libavcodec.
3048 const AVCodecDescriptor *codec_descriptor;
3052 * low resolution decoding, 1-> 1/2 size, 2->1/4 size
3053 * - encoding: unused
3054 * - decoding: Set by user.
3055 * Code outside libavcodec should access this field using:
3056 * av_codec_{get,set}_lowres(avctx)
3062 * Current statistics for PTS correction.
3063 * - decoding: maintained and used by libavcodec, not intended to be used by user apps
3064 * - encoding: unused
3066 int64_t pts_correction_num_faulty_pts; /// Number of incorrect PTS values so far
3067 int64_t pts_correction_num_faulty_dts; /// Number of incorrect DTS values so far
3068 int64_t pts_correction_last_pts; /// PTS of the last frame
3069 int64_t pts_correction_last_dts; /// DTS of the last frame
3072 * Character encoding of the input subtitles file.
3073 * - decoding: set by user
3074 * - encoding: unused
3079 * Subtitles character encoding mode. Formats or codecs might be adjusting
3080 * this setting (if they are doing the conversion themselves for instance).
3081 * - decoding: set by libavcodec
3082 * - encoding: unused
3084 int sub_charenc_mode;
3085 #define FF_SUB_CHARENC_MODE_DO_NOTHING -1 ///< do nothing (demuxer outputs a stream supposed to be already in UTF-8, or the codec is bitmap for instance)
3086 #define FF_SUB_CHARENC_MODE_AUTOMATIC 0 ///< libavcodec will select the mode itself
3087 #define FF_SUB_CHARENC_MODE_PRE_DECODER 1 ///< the AVPacket data needs to be recoded to UTF-8 before being fed to the decoder, requires iconv
3090 * Skip processing alpha if supported by codec.
3091 * Note that if the format uses pre-multiplied alpha (common with VP6,
3092 * and recommended due to better video quality/compression)
3093 * the image will look as if alpha-blended onto a black background.
3094 * However for formats that do not use pre-multiplied alpha
3095 * there might be serious artefacts (though e.g. libswscale currently
3096 * assumes pre-multiplied alpha anyway).
3097 * Code outside libavcodec should access this field using AVOptions
3099 * - decoding: set by user
3100 * - encoding: unused
3105 * Number of samples to skip after a discontinuity
3106 * - decoding: unused
3107 * - encoding: set by libavcodec
3111 #if !FF_API_DEBUG_MV
3113 * debug motion vectors
3114 * Code outside libavcodec should access this field using AVOptions
3115 * - encoding: Set by user.
3116 * - decoding: Set by user.
3119 #define FF_DEBUG_VIS_MV_P_FOR 0x00000001 //visualize forward predicted MVs of P frames
3120 #define FF_DEBUG_VIS_MV_B_FOR 0x00000002 //visualize forward predicted MVs of B frames
3121 #define FF_DEBUG_VIS_MV_B_BACK 0x00000004 //visualize backward predicted MVs of B frames
3125 * custom intra quantization matrix
3126 * Code outside libavcodec should access this field using av_codec_g/set_chroma_intra_matrix()
3127 * - encoding: Set by user, can be NULL.
3128 * - decoding: unused.
3130 uint16_t *chroma_intra_matrix;
3133 * dump format separator.
3134 * can be ", " or "\n " or anything else
3135 * Code outside libavcodec should access this field using AVOptions
3136 * (NO direct access).
3137 * - encoding: Set by user.
3138 * - decoding: Set by user.
3140 uint8_t *dump_separator;
3143 * ',' separated list of allowed decoders.
3144 * If NULL then all are allowed
3145 * - encoding: unused
3146 * - decoding: set by user through AVOPtions (NO direct access)
3148 char *codec_whitelist;
3151 AVRational av_codec_get_pkt_timebase (const AVCodecContext *avctx);
3152 void av_codec_set_pkt_timebase (AVCodecContext *avctx, AVRational val);
3154 const AVCodecDescriptor *av_codec_get_codec_descriptor(const AVCodecContext *avctx);
3155 void av_codec_set_codec_descriptor(AVCodecContext *avctx, const AVCodecDescriptor *desc);
3157 int av_codec_get_lowres(const AVCodecContext *avctx);
3158 void av_codec_set_lowres(AVCodecContext *avctx, int val);
3160 int av_codec_get_seek_preroll(const AVCodecContext *avctx);
3161 void av_codec_set_seek_preroll(AVCodecContext *avctx, int val);
3163 uint16_t *av_codec_get_chroma_intra_matrix(const AVCodecContext *avctx);
3164 void av_codec_set_chroma_intra_matrix(AVCodecContext *avctx, uint16_t *val);
3169 typedef struct AVProfile {
3171 const char *name; ///< short name for the profile
3174 typedef struct AVCodecDefault AVCodecDefault;
3181 typedef struct AVCodec {
3183 * Name of the codec implementation.
3184 * The name is globally unique among encoders and among decoders (but an
3185 * encoder and a decoder can share the same name).
3186 * This is the primary way to find a codec from the user perspective.
3190 * Descriptive name for the codec, meant to be more human readable than name.
3191 * You should use the NULL_IF_CONFIG_SMALL() macro to define it.
3193 const char *long_name;
3194 enum AVMediaType type;
3197 * Codec capabilities.
3201 const AVRational *supported_framerates; ///< array of supported framerates, or NULL if any, array is terminated by {0,0}
3202 const enum AVPixelFormat *pix_fmts; ///< array of supported pixel formats, or NULL if unknown, array is terminated by -1
3203 const int *supported_samplerates; ///< array of supported audio samplerates, or NULL if unknown, array is terminated by 0
3204 const enum AVSampleFormat *sample_fmts; ///< array of supported sample formats, or NULL if unknown, array is terminated by -1
3205 const uint64_t *channel_layouts; ///< array of support channel layouts, or NULL if unknown. array is terminated by 0
3207 uint8_t max_lowres; ///< maximum value for lowres supported by the decoder, no direct access, use av_codec_get_max_lowres()
3209 const AVClass *priv_class; ///< AVClass for the private context
3210 const AVProfile *profiles; ///< array of recognized profiles, or NULL if unknown, array is terminated by {FF_PROFILE_UNKNOWN}
3212 /*****************************************************************
3213 * No fields below this line are part of the public API. They
3214 * may not be used outside of libavcodec and can be changed and
3216 * New public fields should be added right above.
3217 *****************************************************************
3220 struct AVCodec *next;
3222 * @name Frame-level threading support functions
3226 * If defined, called on thread contexts when they are created.
3227 * If the codec allocates writable tables in init(), re-allocate them here.
3228 * priv_data will be set to a copy of the original.
3230 int (*init_thread_copy)(AVCodecContext *);
3232 * Copy necessary context variables from a previous thread context to the current one.
3233 * If not defined, the next thread will start automatically; otherwise, the codec
3234 * must call ff_thread_finish_setup().
3236 * dst and src will (rarely) point to the same context, in which case memcpy should be skipped.
3238 int (*update_thread_context)(AVCodecContext *dst, const AVCodecContext *src);
3242 * Private codec-specific defaults.
3244 const AVCodecDefault *defaults;
3247 * Initialize codec static data, called from avcodec_register().
3249 void (*init_static_data)(struct AVCodec *codec);
3251 int (*init)(AVCodecContext *);
3252 int (*encode_sub)(AVCodecContext *, uint8_t *buf, int buf_size,
3253 const struct AVSubtitle *sub);
3255 * Encode data to an AVPacket.
3257 * @param avctx codec context
3258 * @param avpkt output AVPacket (may contain a user-provided buffer)
3259 * @param[in] frame AVFrame containing the raw data to be encoded
3260 * @param[out] got_packet_ptr encoder sets to 0 or 1 to indicate that a
3261 * non-empty packet was returned in avpkt.
3262 * @return 0 on success, negative error code on failure
3264 int (*encode2)(AVCodecContext *avctx, AVPacket *avpkt, const AVFrame *frame,
3265 int *got_packet_ptr);
3266 int (*decode)(AVCodecContext *, void *outdata, int *outdata_size, AVPacket *avpkt);
3267 int (*close)(AVCodecContext *);
3270 * Will be called when seeking
3272 void (*flush)(AVCodecContext *);
3274 * Internal codec capabilities.
3275 * See FF_CODEC_CAP_* in internal.h
3280 int av_codec_get_max_lowres(const AVCodec *codec);
3282 struct MpegEncContext;
3285 * @defgroup lavc_hwaccel AVHWAccel
3288 typedef struct AVHWAccel {
3290 * Name of the hardware accelerated codec.
3291 * The name is globally unique among encoders and among decoders (but an
3292 * encoder and a decoder can share the same name).
3297 * Type of codec implemented by the hardware accelerator.
3299 * See AVMEDIA_TYPE_xxx
3301 enum AVMediaType type;
3304 * Codec implemented by the hardware accelerator.
3306 * See AV_CODEC_ID_xxx
3311 * Supported pixel format.
3313 * Only hardware accelerated formats are supported here.
3315 enum AVPixelFormat pix_fmt;
3318 * Hardware accelerated codec capabilities.
3319 * see FF_HWACCEL_CODEC_CAP_*
3323 /*****************************************************************
3324 * No fields below this line are part of the public API. They
3325 * may not be used outside of libavcodec and can be changed and
3327 * New public fields should be added right above.
3328 *****************************************************************
3330 struct AVHWAccel *next;
3333 * Allocate a custom buffer
3335 int (*alloc_frame)(AVCodecContext *avctx, AVFrame *frame);
3338 * Called at the beginning of each frame or field picture.
3340 * Meaningful frame information (codec specific) is guaranteed to
3341 * be parsed at this point. This function is mandatory.
3343 * Note that buf can be NULL along with buf_size set to 0.
3344 * Otherwise, this means the whole frame is available at this point.
3346 * @param avctx the codec context
3347 * @param buf the frame data buffer base
3348 * @param buf_size the size of the frame in bytes
3349 * @return zero if successful, a negative value otherwise
3351 int (*start_frame)(AVCodecContext *avctx, const uint8_t *buf, uint32_t buf_size);
3354 * Callback for each slice.
3356 * Meaningful slice information (codec specific) is guaranteed to
3357 * be parsed at this point. This function is mandatory.
3358 * The only exception is XvMC, that works on MB level.
3360 * @param avctx the codec context
3361 * @param buf the slice data buffer base
3362 * @param buf_size the size of the slice in bytes
3363 * @return zero if successful, a negative value otherwise
3365 int (*decode_slice)(AVCodecContext *avctx, const uint8_t *buf, uint32_t buf_size);
3368 * Called at the end of each frame or field picture.
3370 * The whole picture is parsed at this point and can now be sent
3371 * to the hardware accelerator. This function is mandatory.
3373 * @param avctx the codec context
3374 * @return zero if successful, a negative value otherwise
3376 int (*end_frame)(AVCodecContext *avctx);
3379 * Size of per-frame hardware accelerator private data.
3381 * Private data is allocated with av_mallocz() before
3382 * AVCodecContext.get_buffer() and deallocated after
3383 * AVCodecContext.release_buffer().
3385 int frame_priv_data_size;
3388 * Called for every Macroblock in a slice.
3390 * XvMC uses it to replace the ff_mpv_decode_mb().
3391 * Instead of decoding to raw picture, MB parameters are
3392 * stored in an array provided by the video driver.
3394 * @param s the mpeg context
3396 void (*decode_mb)(struct MpegEncContext *s);
3399 * Initialize the hwaccel private data.
3401 * This will be called from ff_get_format(), after hwaccel and
3402 * hwaccel_context are set and the hwaccel private data in AVCodecInternal
3405 int (*init)(AVCodecContext *avctx);
3408 * Uninitialize the hwaccel private data.
3410 * This will be called from get_format() or avcodec_close(), after hwaccel
3411 * and hwaccel_context are already uninitialized.
3413 int (*uninit)(AVCodecContext *avctx);
3416 * Size of the private data to allocate in
3417 * AVCodecInternal.hwaccel_priv_data.
3423 * Hardware acceleration should be used for decoding even if the codec level
3424 * used is unknown or higher than the maximum supported level reported by the
3427 #define AV_HWACCEL_FLAG_IGNORE_LEVEL (1 << 0)
3430 * Hardware acceleration can output YUV pixel formats with a different chroma
3431 * sampling than 4:2:0 and/or other than 8 bits per component.
3433 #define AV_HWACCEL_FLAG_ALLOW_HIGH_DEPTH (1 << 1)
3440 * @defgroup lavc_picture AVPicture
3442 * Functions for working with AVPicture
3447 * Picture data structure.
3449 * Up to four components can be stored into it, the last component is
3452 typedef struct AVPicture {
3453 uint8_t *data[AV_NUM_DATA_POINTERS]; ///< pointers to the image data planes
3454 int linesize[AV_NUM_DATA_POINTERS]; ///< number of bytes per line
3461 enum AVSubtitleType {
3464 SUBTITLE_BITMAP, ///< A bitmap, pict will be set
3467 * Plain text, the text field must be set by the decoder and is
3468 * authoritative. ass and pict fields may contain approximations.
3473 * Formatted text, the ass field must be set by the decoder and is
3474 * authoritative. pict and text fields may contain approximations.
3479 #define AV_SUBTITLE_FLAG_FORCED 0x00000001
3481 typedef struct AVSubtitleRect {
3482 int x; ///< top left corner of pict, undefined when pict is not set
3483 int y; ///< top left corner of pict, undefined when pict is not set
3484 int w; ///< width of pict, undefined when pict is not set
3485 int h; ///< height of pict, undefined when pict is not set
3486 int nb_colors; ///< number of colors in pict, undefined when pict is not set
3489 * data+linesize for the bitmap of this subtitle.
3490 * can be set for text/ass as well once they are rendered
3493 enum AVSubtitleType type;
3495 char *text; ///< 0 terminated plain UTF-8 text
3498 * 0 terminated ASS/SSA compatible event line.
3499 * The presentation of this is unaffected by the other values in this
3507 typedef struct AVSubtitle {
3508 uint16_t format; /* 0 = graphics */
3509 uint32_t start_display_time; /* relative to packet pts, in ms */
3510 uint32_t end_display_time; /* relative to packet pts, in ms */
3512 AVSubtitleRect **rects;
3513 int64_t pts; ///< Same as packet pts, in AV_TIME_BASE
3517 * If c is NULL, returns the first registered codec,
3518 * if c is non-NULL, returns the next registered codec after c,
3519 * or NULL if c is the last one.
3521 AVCodec *av_codec_next(const AVCodec *c);
3524 * Return the LIBAVCODEC_VERSION_INT constant.
3526 unsigned avcodec_version(void);
3529 * Return the libavcodec build-time configuration.
3531 const char *avcodec_configuration(void);
3534 * Return the libavcodec license.
3536 const char *avcodec_license(void);
3539 * Register the codec codec and initialize libavcodec.
3541 * @warning either this function or avcodec_register_all() must be called
3542 * before any other libavcodec functions.
3544 * @see avcodec_register_all()
3546 void avcodec_register(AVCodec *codec);
3549 * Register all the codecs, parsers and bitstream filters which were enabled at
3550 * configuration time. If you do not call this function you can select exactly
3551 * which formats you want to support, by using the individual registration
3554 * @see avcodec_register
3555 * @see av_register_codec_parser
3556 * @see av_register_bitstream_filter
3558 void avcodec_register_all(void);
3561 * Allocate an AVCodecContext and set its fields to default values. The
3562 * resulting struct should be freed with avcodec_free_context().
3564 * @param codec if non-NULL, allocate private data and initialize defaults
3565 * for the given codec. It is illegal to then call avcodec_open2()
3566 * with a different codec.
3567 * If NULL, then the codec-specific defaults won't be initialized,
3568 * which may result in suboptimal default settings (this is
3569 * important mainly for encoders, e.g. libx264).
3571 * @return An AVCodecContext filled with default values or NULL on failure.
3572 * @see avcodec_get_context_defaults
3574 AVCodecContext *avcodec_alloc_context3(const AVCodec *codec);
3577 * Free the codec context and everything associated with it and write NULL to
3578 * the provided pointer.
3580 void avcodec_free_context(AVCodecContext **avctx);
3583 * Set the fields of the given AVCodecContext to default values corresponding
3584 * to the given codec (defaults may be codec-dependent).
3586 * Do not call this function if a non-NULL codec has been passed
3587 * to avcodec_alloc_context3() that allocated this AVCodecContext.
3588 * If codec is non-NULL, it is illegal to call avcodec_open2() with a
3589 * different codec on this AVCodecContext.
3591 int avcodec_get_context_defaults3(AVCodecContext *s, const AVCodec *codec);
3594 * Get the AVClass for AVCodecContext. It can be used in combination with
3595 * AV_OPT_SEARCH_FAKE_OBJ for examining options.
3597 * @see av_opt_find().
3599 const AVClass *avcodec_get_class(void);
3602 * Get the AVClass for AVFrame. It can be used in combination with
3603 * AV_OPT_SEARCH_FAKE_OBJ for examining options.
3605 * @see av_opt_find().
3607 const AVClass *avcodec_get_frame_class(void);
3610 * Get the AVClass for AVSubtitleRect. It can be used in combination with
3611 * AV_OPT_SEARCH_FAKE_OBJ for examining options.
3613 * @see av_opt_find().
3615 const AVClass *avcodec_get_subtitle_rect_class(void);
3618 * Copy the settings of the source AVCodecContext into the destination
3619 * AVCodecContext. The resulting destination codec context will be
3620 * unopened, i.e. you are required to call avcodec_open2() before you
3621 * can use this AVCodecContext to decode/encode video/audio data.
3623 * @param dest target codec context, should be initialized with
3624 * avcodec_alloc_context3(NULL), but otherwise uninitialized
3625 * @param src source codec context
3626 * @return AVERROR() on error (e.g. memory allocation error), 0 on success
3628 int avcodec_copy_context(AVCodecContext *dest, const AVCodecContext *src);
3630 #if FF_API_AVFRAME_LAVC
3632 * @deprecated use av_frame_alloc()
3634 attribute_deprecated
3635 AVFrame *avcodec_alloc_frame(void);
3638 * Set the fields of the given AVFrame to default values.
3640 * @param frame The AVFrame of which the fields should be set to default values.
3642 * @deprecated use av_frame_unref()
3644 attribute_deprecated
3645 void avcodec_get_frame_defaults(AVFrame *frame);
3648 * Free the frame and any dynamically allocated objects in it,
3649 * e.g. extended_data.
3651 * @param frame frame to be freed. The pointer will be set to NULL.
3653 * @warning this function does NOT free the data buffers themselves
3654 * (it does not know how, since they might have been allocated with
3655 * a custom get_buffer()).
3657 * @deprecated use av_frame_free()
3659 attribute_deprecated
3660 void avcodec_free_frame(AVFrame **frame);
3664 * Initialize the AVCodecContext to use the given AVCodec. Prior to using this
3665 * function the context has to be allocated with avcodec_alloc_context3().
3667 * The functions avcodec_find_decoder_by_name(), avcodec_find_encoder_by_name(),
3668 * avcodec_find_decoder() and avcodec_find_encoder() provide an easy way for
3669 * retrieving a codec.
3671 * @warning This function is not thread safe!
3673 * @note Always call this function before using decoding routines (such as
3674 * @ref avcodec_decode_video2()).
3677 * avcodec_register_all();
3678 * av_dict_set(&opts, "b", "2.5M", 0);
3679 * codec = avcodec_find_decoder(AV_CODEC_ID_H264);
3683 * context = avcodec_alloc_context3(codec);
3685 * if (avcodec_open2(context, codec, opts) < 0)
3689 * @param avctx The context to initialize.
3690 * @param codec The codec to open this context for. If a non-NULL codec has been
3691 * previously passed to avcodec_alloc_context3() or
3692 * avcodec_get_context_defaults3() for this context, then this
3693 * parameter MUST be either NULL or equal to the previously passed
3695 * @param options A dictionary filled with AVCodecContext and codec-private options.
3696 * On return this object will be filled with options that were not found.
3698 * @return zero on success, a negative value on error
3699 * @see avcodec_alloc_context3(), avcodec_find_decoder(), avcodec_find_encoder(),
3700 * av_dict_set(), av_opt_find().
3702 int avcodec_open2(AVCodecContext *avctx, const AVCodec *codec, AVDictionary **options);
3705 * Close a given AVCodecContext and free all the data associated with it
3706 * (but not the AVCodecContext itself).
3708 * Calling this function on an AVCodecContext that hasn't been opened will free
3709 * the codec-specific data allocated in avcodec_alloc_context3() /
3710 * avcodec_get_context_defaults3() with a non-NULL codec. Subsequent calls will
3713 int avcodec_close(AVCodecContext *avctx);
3716 * Free all allocated data in the given subtitle struct.
3718 * @param sub AVSubtitle to free.
3720 void avsubtitle_free(AVSubtitle *sub);
3727 * @addtogroup lavc_packet
3731 #if FF_API_DESTRUCT_PACKET
3733 * Default packet destructor.
3734 * @deprecated use the AVBuffer API instead
3736 attribute_deprecated
3737 void av_destruct_packet(AVPacket *pkt);
3741 * Initialize optional fields of a packet with default values.
3743 * Note, this does not touch the data and size members, which have to be
3744 * initialized separately.
3748 void av_init_packet(AVPacket *pkt);
3751 * Allocate the payload of a packet and initialize its fields with
3755 * @param size wanted payload size
3756 * @return 0 if OK, AVERROR_xxx otherwise
3758 int av_new_packet(AVPacket *pkt, int size);
3761 * Reduce packet size, correctly zeroing padding
3764 * @param size new size
3766 void av_shrink_packet(AVPacket *pkt, int size);
3769 * Increase packet size, correctly zeroing padding
3772 * @param grow_by number of bytes by which to increase the size of the packet
3774 int av_grow_packet(AVPacket *pkt, int grow_by);
3777 * Initialize a reference-counted packet from av_malloc()ed data.
3779 * @param pkt packet to be initialized. This function will set the data, size,
3780 * buf and destruct fields, all others are left untouched.
3781 * @param data Data allocated by av_malloc() to be used as packet data. If this
3782 * function returns successfully, the data is owned by the underlying AVBuffer.
3783 * The caller may not access the data through other means.
3784 * @param size size of data in bytes, without the padding. I.e. the full buffer
3785 * size is assumed to be size + FF_INPUT_BUFFER_PADDING_SIZE.
3787 * @return 0 on success, a negative AVERROR on error
3789 int av_packet_from_data(AVPacket *pkt, uint8_t *data, int size);
3792 * @warning This is a hack - the packet memory allocation stuff is broken. The
3793 * packet is allocated if it was not really allocated.
3795 int av_dup_packet(AVPacket *pkt);
3798 * Copy packet, including contents
3800 * @return 0 on success, negative AVERROR on fail
3802 int av_copy_packet(AVPacket *dst, const AVPacket *src);
3805 * Copy packet side data
3807 * @return 0 on success, negative AVERROR on fail
3809 int av_copy_packet_side_data(AVPacket *dst, const AVPacket *src);
3814 * @param pkt packet to free
3816 void av_free_packet(AVPacket *pkt);
3819 * Allocate new information of a packet.
3822 * @param type side information type
3823 * @param size side information size
3824 * @return pointer to fresh allocated data or NULL otherwise
3826 uint8_t* av_packet_new_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
3830 * Shrink the already allocated side data buffer
3833 * @param type side information type
3834 * @param size new side information size
3835 * @return 0 on success, < 0 on failure
3837 int av_packet_shrink_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
3841 * Get side information from packet.
3844 * @param type desired side information type
3845 * @param size pointer for side information size to store (optional)
3846 * @return pointer to data if present or NULL otherwise
3848 uint8_t* av_packet_get_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
3851 int av_packet_merge_side_data(AVPacket *pkt);
3853 int av_packet_split_side_data(AVPacket *pkt);
3855 const char *av_packet_side_data_name(enum AVPacketSideDataType type);
3858 * Pack a dictionary for use in side_data.
3860 * @param dict The dictionary to pack.
3861 * @param size pointer to store the size of the returned data
3862 * @return pointer to data if successful, NULL otherwise
3864 uint8_t *av_packet_pack_dictionary(AVDictionary *dict, int *size);
3866 * Unpack a dictionary from side_data.
3868 * @param data data from side_data
3869 * @param size size of the data
3870 * @param dict the metadata storage dictionary
3871 * @return 0 on success, < 0 on failure
3873 int av_packet_unpack_dictionary(const uint8_t *data, int size, AVDictionary **dict);
3877 * Convenience function to free all the side data stored.
3878 * All the other fields stay untouched.
3882 void av_packet_free_side_data(AVPacket *pkt);
3885 * Setup a new reference to the data described by a given packet
3887 * If src is reference-counted, setup dst as a new reference to the
3888 * buffer in src. Otherwise allocate a new buffer in dst and copy the
3889 * data from src into it.
3891 * All the other fields are copied from src.
3893 * @see av_packet_unref
3895 * @param dst Destination packet
3896 * @param src Source packet
3898 * @return 0 on success, a negative AVERROR on error.
3900 int av_packet_ref(AVPacket *dst, const AVPacket *src);
3905 * Unreference the buffer referenced by the packet and reset the
3906 * remaining packet fields to their default values.
3908 * @param pkt The packet to be unreferenced.
3910 void av_packet_unref(AVPacket *pkt);
3913 * Move every field in src to dst and reset src.
3915 * @see av_packet_unref
3917 * @param src Source packet, will be reset
3918 * @param dst Destination packet
3920 void av_packet_move_ref(AVPacket *dst, AVPacket *src);
3923 * Copy only "properties" fields from src to dst.
3925 * Properties for the purpose of this function are all the fields
3926 * beside those related to the packet data (buf, data, size)
3928 * @param dst Destination packet
3929 * @param src Source packet
3931 * @return 0 on success AVERROR on failure.
3934 int av_packet_copy_props(AVPacket *dst, const AVPacket *src);
3937 * Convert valid timing fields (timestamps / durations) in a packet from one
3938 * timebase to another. Timestamps with unknown values (AV_NOPTS_VALUE) will be
3941 * @param pkt packet on which the conversion will be performed
3942 * @param tb_src source timebase, in which the timing fields in pkt are
3944 * @param tb_dst destination timebase, to which the timing fields will be
3947 void av_packet_rescale_ts(AVPacket *pkt, AVRational tb_src, AVRational tb_dst);
3954 * @addtogroup lavc_decoding
3959 * Find a registered decoder with a matching codec ID.
3961 * @param id AVCodecID of the requested decoder
3962 * @return A decoder if one was found, NULL otherwise.
3964 AVCodec *avcodec_find_decoder(enum AVCodecID id);
3967 * Find a registered decoder with the specified name.
3969 * @param name name of the requested decoder
3970 * @return A decoder if one was found, NULL otherwise.
3972 AVCodec *avcodec_find_decoder_by_name(const char *name);
3974 #if FF_API_GET_BUFFER
3975 attribute_deprecated int avcodec_default_get_buffer(AVCodecContext *s, AVFrame *pic);
3976 attribute_deprecated void avcodec_default_release_buffer(AVCodecContext *s, AVFrame *pic);
3977 attribute_deprecated int avcodec_default_reget_buffer(AVCodecContext *s, AVFrame *pic);
3981 * The default callback for AVCodecContext.get_buffer2(). It is made public so
3982 * it can be called by custom get_buffer2() implementations for decoders without
3983 * CODEC_CAP_DR1 set.
3985 int avcodec_default_get_buffer2(AVCodecContext *s, AVFrame *frame, int flags);
3989 * Return the amount of padding in pixels which the get_buffer callback must
3990 * provide around the edge of the image for codecs which do not have the
3991 * CODEC_FLAG_EMU_EDGE flag.
3993 * @return Required padding in pixels.
3995 * @deprecated CODEC_FLAG_EMU_EDGE is deprecated, so this function is no longer
3998 attribute_deprecated
3999 unsigned avcodec_get_edge_width(void);
4003 * Modify width and height values so that they will result in a memory
4004 * buffer that is acceptable for the codec if you do not use any horizontal
4007 * May only be used if a codec with CODEC_CAP_DR1 has been opened.
4009 void avcodec_align_dimensions(AVCodecContext *s, int *width, int *height);
4012 * Modify width and height values so that they will result in a memory
4013 * buffer that is acceptable for the codec if you also ensure that all
4014 * line sizes are a multiple of the respective linesize_align[i].
4016 * May only be used if a codec with CODEC_CAP_DR1 has been opened.
4018 void avcodec_align_dimensions2(AVCodecContext *s, int *width, int *height,
4019 int linesize_align[AV_NUM_DATA_POINTERS]);
4022 * Converts AVChromaLocation to swscale x/y chroma position.
4024 * The positions represent the chroma (0,0) position in a coordinates system
4025 * with luma (0,0) representing the origin and luma(1,1) representing 256,256
4027 * @param xpos horizontal chroma sample position
4028 * @param ypos vertical chroma sample position
4030 int avcodec_enum_to_chroma_pos(int *xpos, int *ypos, enum AVChromaLocation pos);
4033 * Converts swscale x/y chroma position to AVChromaLocation.
4035 * The positions represent the chroma (0,0) position in a coordinates system
4036 * with luma (0,0) representing the origin and luma(1,1) representing 256,256
4038 * @param xpos horizontal chroma sample position
4039 * @param ypos vertical chroma sample position
4041 enum AVChromaLocation avcodec_chroma_pos_to_enum(int xpos, int ypos);
4043 #if FF_API_OLD_DECODE_AUDIO
4045 * Wrapper function which calls avcodec_decode_audio4.
4047 * @deprecated Use avcodec_decode_audio4 instead.
4049 * Decode the audio frame of size avpkt->size from avpkt->data into samples.
4050 * Some decoders may support multiple frames in a single AVPacket, such
4051 * decoders would then just decode the first frame. In this case,
4052 * avcodec_decode_audio3 has to be called again with an AVPacket that contains
4053 * the remaining data in order to decode the second frame etc.
4055 * could be outputted, frame_size_ptr is zero. Otherwise, it is the
4056 * decompressed frame size in bytes.
4058 * @warning You must set frame_size_ptr to the allocated size of the
4059 * output buffer before calling avcodec_decode_audio3().
4061 * @warning The input buffer must be FF_INPUT_BUFFER_PADDING_SIZE larger than
4062 * the actual read bytes because some optimized bitstream readers read 32 or 64
4063 * bits at once and could read over the end.
4065 * @warning The end of the input buffer avpkt->data should be set to 0 to ensure that
4066 * no overreading happens for damaged MPEG streams.
4068 * @warning You must not provide a custom get_buffer() when using
4069 * avcodec_decode_audio3(). Doing so will override it with
4070 * avcodec_default_get_buffer. Use avcodec_decode_audio4() instead,
4071 * which does allow the application to provide a custom get_buffer().
4073 * @note You might have to align the input buffer avpkt->data and output buffer
4074 * samples. The alignment requirements depend on the CPU: On some CPUs it isn't
4075 * necessary at all, on others it won't work at all if not aligned and on others
4076 * it will work but it will have an impact on performance.
4078 * In practice, avpkt->data should have 4 byte alignment at minimum and
4079 * samples should be 16 byte aligned unless the CPU doesn't need it
4080 * (AltiVec and SSE do).
4082 * @note Codecs which have the CODEC_CAP_DELAY capability set have a delay
4083 * between input and output, these need to be fed with avpkt->data=NULL,
4084 * avpkt->size=0 at the end to return the remaining frames.
4086 * @param avctx the codec context
4087 * @param[out] samples the output buffer, sample type in avctx->sample_fmt
4088 * If the sample format is planar, each channel plane will
4089 * be the same size, with no padding between channels.
4090 * @param[in,out] frame_size_ptr the output buffer size in bytes
4091 * @param[in] avpkt The input AVPacket containing the input buffer.
4092 * You can create such packet with av_init_packet() and by then setting
4093 * data and size, some decoders might in addition need other fields.
4094 * All decoders are designed to use the least fields possible though.
4095 * @return On error a negative value is returned, otherwise the number of bytes
4096 * used or zero if no frame data was decompressed (used) from the input AVPacket.
4098 attribute_deprecated int avcodec_decode_audio3(AVCodecContext *avctx, int16_t *samples,
4099 int *frame_size_ptr,
4104 * Decode the audio frame of size avpkt->size from avpkt->data into frame.
4106 * Some decoders may support multiple frames in a single AVPacket. Such
4107 * decoders would then just decode the first frame and the return value would be
4108 * less than the packet size. In this case, avcodec_decode_audio4 has to be
4109 * called again with an AVPacket containing the remaining data in order to
4110 * decode the second frame, etc... Even if no frames are returned, the packet
4111 * needs to be fed to the decoder with remaining data until it is completely
4112 * consumed or an error occurs.
4114 * Some decoders (those marked with CODEC_CAP_DELAY) have a delay between input
4115 * and output. This means that for some packets they will not immediately
4116 * produce decoded output and need to be flushed at the end of decoding to get
4117 * all the decoded data. Flushing is done by calling this function with packets
4118 * with avpkt->data set to NULL and avpkt->size set to 0 until it stops
4119 * returning samples. It is safe to flush even those decoders that are not
4120 * marked with CODEC_CAP_DELAY, then no samples will be returned.
4122 * @warning The input buffer, avpkt->data must be FF_INPUT_BUFFER_PADDING_SIZE
4123 * larger than the actual read bytes because some optimized bitstream
4124 * readers read 32 or 64 bits at once and could read over the end.
4126 * @note The AVCodecContext MUST have been opened with @ref avcodec_open2()
4127 * before packets may be fed to the decoder.
4129 * @param avctx the codec context
4130 * @param[out] frame The AVFrame in which to store decoded audio samples.
4131 * The decoder will allocate a buffer for the decoded frame by
4132 * calling the AVCodecContext.get_buffer2() callback.
4133 * When AVCodecContext.refcounted_frames is set to 1, the frame is
4134 * reference counted and the returned reference belongs to the
4135 * caller. The caller must release the frame using av_frame_unref()
4136 * when the frame is no longer needed. The caller may safely write
4137 * to the frame if av_frame_is_writable() returns 1.
4138 * When AVCodecContext.refcounted_frames is set to 0, the returned
4139 * reference belongs to the decoder and is valid only until the
4140 * next call to this function or until closing or flushing the
4141 * decoder. The caller may not write to it.
4142 * @param[out] got_frame_ptr Zero if no frame could be decoded, otherwise it is
4143 * non-zero. Note that this field being set to zero
4144 * does not mean that an error has occurred. For
4145 * decoders with CODEC_CAP_DELAY set, no given decode
4146 * call is guaranteed to produce a frame.
4147 * @param[in] avpkt The input AVPacket containing the input buffer.
4148 * At least avpkt->data and avpkt->size should be set. Some
4149 * decoders might also require additional fields to be set.
4150 * @return A negative error code is returned if an error occurred during
4151 * decoding, otherwise the number of bytes consumed from the input
4152 * AVPacket is returned.
4154 int avcodec_decode_audio4(AVCodecContext *avctx, AVFrame *frame,
4155 int *got_frame_ptr, const AVPacket *avpkt);
4158 * Decode the video frame of size avpkt->size from avpkt->data into picture.
4159 * Some decoders may support multiple frames in a single AVPacket, such
4160 * decoders would then just decode the first frame.
4162 * @warning The input buffer must be FF_INPUT_BUFFER_PADDING_SIZE larger than
4163 * the actual read bytes because some optimized bitstream readers read 32 or 64
4164 * bits at once and could read over the end.
4166 * @warning The end of the input buffer buf should be set to 0 to ensure that
4167 * no overreading happens for damaged MPEG streams.
4169 * @note Codecs which have the CODEC_CAP_DELAY capability set have a delay
4170 * between input and output, these need to be fed with avpkt->data=NULL,
4171 * avpkt->size=0 at the end to return the remaining frames.
4173 * @note The AVCodecContext MUST have been opened with @ref avcodec_open2()
4174 * before packets may be fed to the decoder.
4176 * @param avctx the codec context
4177 * @param[out] picture The AVFrame in which the decoded video frame will be stored.
4178 * Use av_frame_alloc() to get an AVFrame. The codec will
4179 * allocate memory for the actual bitmap by calling the
4180 * AVCodecContext.get_buffer2() callback.
4181 * When AVCodecContext.refcounted_frames is set to 1, the frame is
4182 * reference counted and the returned reference belongs to the
4183 * caller. The caller must release the frame using av_frame_unref()
4184 * when the frame is no longer needed. The caller may safely write
4185 * to the frame if av_frame_is_writable() returns 1.
4186 * When AVCodecContext.refcounted_frames is set to 0, the returned
4187 * reference belongs to the decoder and is valid only until the
4188 * next call to this function or until closing or flushing the
4189 * decoder. The caller may not write to it.
4191 * @param[in] avpkt The input AVPacket containing the input buffer.
4192 * You can create such packet with av_init_packet() and by then setting
4193 * data and size, some decoders might in addition need other fields like
4194 * flags&AV_PKT_FLAG_KEY. All decoders are designed to use the least
4196 * @param[in,out] got_picture_ptr Zero if no frame could be decompressed, otherwise, it is nonzero.
4197 * @return On error a negative value is returned, otherwise the number of bytes
4198 * used or zero if no frame could be decompressed.
4200 int avcodec_decode_video2(AVCodecContext *avctx, AVFrame *picture,
4201 int *got_picture_ptr,
4202 const AVPacket *avpkt);
4205 * Decode a subtitle message.
4206 * Return a negative value on error, otherwise return the number of bytes used.
4207 * If no subtitle could be decompressed, got_sub_ptr is zero.
4208 * Otherwise, the subtitle is stored in *sub.
4209 * Note that CODEC_CAP_DR1 is not available for subtitle codecs. This is for
4210 * simplicity, because the performance difference is expect to be negligible
4211 * and reusing a get_buffer written for video codecs would probably perform badly
4212 * due to a potentially very different allocation pattern.
4214 * Some decoders (those marked with CODEC_CAP_DELAY) have a delay between input
4215 * and output. This means that for some packets they will not immediately
4216 * produce decoded output and need to be flushed at the end of decoding to get
4217 * all the decoded data. Flushing is done by calling this function with packets
4218 * with avpkt->data set to NULL and avpkt->size set to 0 until it stops
4219 * returning subtitles. It is safe to flush even those decoders that are not
4220 * marked with CODEC_CAP_DELAY, then no subtitles will be returned.
4222 * @note The AVCodecContext MUST have been opened with @ref avcodec_open2()
4223 * before packets may be fed to the decoder.
4225 * @param avctx the codec context
4226 * @param[out] sub The Preallocated AVSubtitle in which the decoded subtitle will be stored,
4227 * must be freed with avsubtitle_free if *got_sub_ptr is set.
4228 * @param[in,out] got_sub_ptr Zero if no subtitle could be decompressed, otherwise, it is nonzero.
4229 * @param[in] avpkt The input AVPacket containing the input buffer.
4231 int avcodec_decode_subtitle2(AVCodecContext *avctx, AVSubtitle *sub,
4236 * @defgroup lavc_parsing Frame parsing
4240 enum AVPictureStructure {
4241 AV_PICTURE_STRUCTURE_UNKNOWN, //< unknown
4242 AV_PICTURE_STRUCTURE_TOP_FIELD, //< coded as top field
4243 AV_PICTURE_STRUCTURE_BOTTOM_FIELD, //< coded as bottom field
4244 AV_PICTURE_STRUCTURE_FRAME, //< coded as frame
4247 typedef struct AVCodecParserContext {
4249 struct AVCodecParser *parser;
4250 int64_t frame_offset; /* offset of the current frame */
4251 int64_t cur_offset; /* current offset
4252 (incremented by each av_parser_parse()) */
4253 int64_t next_frame_offset; /* offset of the next frame */
4255 int pict_type; /* XXX: Put it back in AVCodecContext. */
4257 * This field is used for proper frame duration computation in lavf.
4258 * It signals, how much longer the frame duration of the current frame
4259 * is compared to normal frame duration.
4261 * frame_duration = (1 + repeat_pict) * time_base
4263 * It is used by codecs like H.264 to display telecined material.
4265 int repeat_pict; /* XXX: Put it back in AVCodecContext. */
4266 int64_t pts; /* pts of the current frame */
4267 int64_t dts; /* dts of the current frame */
4272 int fetch_timestamp;
4274 #define AV_PARSER_PTS_NB 4
4275 int cur_frame_start_index;
4276 int64_t cur_frame_offset[AV_PARSER_PTS_NB];
4277 int64_t cur_frame_pts[AV_PARSER_PTS_NB];
4278 int64_t cur_frame_dts[AV_PARSER_PTS_NB];
4281 #define PARSER_FLAG_COMPLETE_FRAMES 0x0001
4282 #define PARSER_FLAG_ONCE 0x0002
4283 /// Set if the parser has a valid file offset
4284 #define PARSER_FLAG_FETCHED_OFFSET 0x0004
4285 #define PARSER_FLAG_USE_CODEC_TS 0x1000
4287 int64_t offset; ///< byte offset from starting packet start
4288 int64_t cur_frame_end[AV_PARSER_PTS_NB];
4291 * Set by parser to 1 for key frames and 0 for non-key frames.
4292 * It is initialized to -1, so if the parser doesn't set this flag,
4293 * old-style fallback using AV_PICTURE_TYPE_I picture type as key frames
4299 * Time difference in stream time base units from the pts of this
4300 * packet to the point at which the output from the decoder has converged
4301 * independent from the availability of previous frames. That is, the
4302 * frames are virtually identical no matter if decoding started from
4303 * the very first frame or from this keyframe.
4304 * Is AV_NOPTS_VALUE if unknown.
4305 * This field is not the display duration of the current frame.
4306 * This field has no meaning if the packet does not have AV_PKT_FLAG_KEY
4309 * The purpose of this field is to allow seeking in streams that have no
4310 * keyframes in the conventional sense. It corresponds to the
4311 * recovery point SEI in H.264 and match_time_delta in NUT. It is also
4312 * essential for some types of subtitle streams to ensure that all
4313 * subtitles are correctly displayed after seeking.
4315 int64_t convergence_duration;
4317 // Timestamp generation support:
4319 * Synchronization point for start of timestamp generation.
4321 * Set to >0 for sync point, 0 for no sync point and <0 for undefined
4324 * For example, this corresponds to presence of H.264 buffering period
4330 * Offset of the current timestamp against last timestamp sync point in
4331 * units of AVCodecContext.time_base.
4333 * Set to INT_MIN when dts_sync_point unused. Otherwise, it must
4334 * contain a valid timestamp offset.
4336 * Note that the timestamp of sync point has usually a nonzero
4337 * dts_ref_dts_delta, which refers to the previous sync point. Offset of
4338 * the next frame after timestamp sync point will be usually 1.
4340 * For example, this corresponds to H.264 cpb_removal_delay.
4342 int dts_ref_dts_delta;
4345 * Presentation delay of current frame in units of AVCodecContext.time_base.
4347 * Set to INT_MIN when dts_sync_point unused. Otherwise, it must
4348 * contain valid non-negative timestamp delta (presentation time of a frame
4349 * must not lie in the past).
4351 * This delay represents the difference between decoding and presentation
4352 * time of the frame.
4354 * For example, this corresponds to H.264 dpb_output_delay.
4359 * Position of the packet in file.
4361 * Analogous to cur_frame_pts/dts
4363 int64_t cur_frame_pos[AV_PARSER_PTS_NB];
4366 * Byte position of currently parsed frame in stream.
4371 * Previous frame byte position.
4376 * Duration of the current frame.
4377 * For audio, this is in units of 1 / AVCodecContext.sample_rate.
4378 * For all other types, this is in units of AVCodecContext.time_base.
4382 enum AVFieldOrder field_order;
4385 * Indicate whether a picture is coded as a frame, top field or bottom field.
4387 * For example, H.264 field_pic_flag equal to 0 corresponds to
4388 * AV_PICTURE_STRUCTURE_FRAME. An H.264 picture with field_pic_flag
4389 * equal to 1 and bottom_field_flag equal to 0 corresponds to
4390 * AV_PICTURE_STRUCTURE_TOP_FIELD.
4392 enum AVPictureStructure picture_structure;
4395 * Picture number incremented in presentation or output order.
4396 * This field may be reinitialized at the first picture of a new sequence.
4398 * For example, this corresponds to H.264 PicOrderCnt.
4400 int output_picture_number;
4403 * Dimensions of the decoded video intended for presentation.
4409 * Dimensions of the coded video.
4415 * The format of the coded data, corresponds to enum AVPixelFormat for video
4416 * and for enum AVSampleFormat for audio.
4418 * Note that a decoder can have considerable freedom in how exactly it
4419 * decodes the data, so the format reported here might be different from the
4420 * one returned by a decoder.
4423 } AVCodecParserContext;
4425 typedef struct AVCodecParser {
4426 int codec_ids[5]; /* several codec IDs are permitted */
4428 int (*parser_init)(AVCodecParserContext *s);
4429 /* This callback never returns an error, a negative value means that
4430 * the frame start was in a previous packet. */
4431 int (*parser_parse)(AVCodecParserContext *s,
4432 AVCodecContext *avctx,
4433 const uint8_t **poutbuf, int *poutbuf_size,
4434 const uint8_t *buf, int buf_size);
4435 void (*parser_close)(AVCodecParserContext *s);
4436 int (*split)(AVCodecContext *avctx, const uint8_t *buf, int buf_size);
4437 struct AVCodecParser *next;
4440 AVCodecParser *av_parser_next(const AVCodecParser *c);
4442 void av_register_codec_parser(AVCodecParser *parser);
4443 AVCodecParserContext *av_parser_init(int codec_id);
4448 * @param s parser context.
4449 * @param avctx codec context.
4450 * @param poutbuf set to pointer to parsed buffer or NULL if not yet finished.
4451 * @param poutbuf_size set to size of parsed buffer or zero if not yet finished.
4452 * @param buf input buffer.
4453 * @param buf_size input length, to signal EOF, this should be 0 (so that the last frame can be output).
4454 * @param pts input presentation timestamp.
4455 * @param dts input decoding timestamp.
4456 * @param pos input byte position in stream.
4457 * @return the number of bytes of the input bitstream used.
4462 * len = av_parser_parse2(myparser, AVCodecContext, &data, &size,
4469 * decode_frame(data, size);
4473 int av_parser_parse2(AVCodecParserContext *s,
4474 AVCodecContext *avctx,
4475 uint8_t **poutbuf, int *poutbuf_size,
4476 const uint8_t *buf, int buf_size,
4477 int64_t pts, int64_t dts,
4481 * @return 0 if the output buffer is a subset of the input, 1 if it is allocated and must be freed
4482 * @deprecated use AVBitStreamFilter
4484 int av_parser_change(AVCodecParserContext *s,
4485 AVCodecContext *avctx,
4486 uint8_t **poutbuf, int *poutbuf_size,
4487 const uint8_t *buf, int buf_size, int keyframe);
4488 void av_parser_close(AVCodecParserContext *s);
4496 * @addtogroup lavc_encoding
4501 * Find a registered encoder with a matching codec ID.
4503 * @param id AVCodecID of the requested encoder
4504 * @return An encoder if one was found, NULL otherwise.
4506 AVCodec *avcodec_find_encoder(enum AVCodecID id);
4509 * Find a registered encoder with the specified name.
4511 * @param name name of the requested encoder
4512 * @return An encoder if one was found, NULL otherwise.
4514 AVCodec *avcodec_find_encoder_by_name(const char *name);
4516 #if FF_API_OLD_ENCODE_AUDIO
4518 * Encode an audio frame from samples into buf.
4520 * @deprecated Use avcodec_encode_audio2 instead.
4522 * @note The output buffer should be at least FF_MIN_BUFFER_SIZE bytes large.
4523 * However, for codecs with avctx->frame_size equal to 0 (e.g. PCM) the user
4524 * will know how much space is needed because it depends on the value passed
4525 * in buf_size as described below. In that case a lower value can be used.
4527 * @param avctx the codec context
4528 * @param[out] buf the output buffer
4529 * @param[in] buf_size the output buffer size
4530 * @param[in] samples the input buffer containing the samples
4531 * The number of samples read from this buffer is frame_size*channels,
4532 * both of which are defined in avctx.
4533 * For codecs which have avctx->frame_size equal to 0 (e.g. PCM) the number of
4534 * samples read from samples is equal to:
4535 * buf_size * 8 / (avctx->channels * av_get_bits_per_sample(avctx->codec_id))
4536 * This also implies that av_get_bits_per_sample() must not return 0 for these
4538 * @return On error a negative value is returned, on success zero or the number
4539 * of bytes used to encode the data read from the input buffer.
4541 int attribute_deprecated avcodec_encode_audio(AVCodecContext *avctx,
4542 uint8_t *buf, int buf_size,
4543 const short *samples);
4547 * Encode a frame of audio.
4549 * Takes input samples from frame and writes the next output packet, if
4550 * available, to avpkt. The output packet does not necessarily contain data for
4551 * the most recent frame, as encoders can delay, split, and combine input frames
4552 * internally as needed.
4554 * @param avctx codec context
4555 * @param avpkt output AVPacket.
4556 * The user can supply an output buffer by setting
4557 * avpkt->data and avpkt->size prior to calling the
4558 * function, but if the size of the user-provided data is not
4559 * large enough, encoding will fail. If avpkt->data and
4560 * avpkt->size are set, avpkt->destruct must also be set. All
4561 * other AVPacket fields will be reset by the encoder using
4562 * av_init_packet(). If avpkt->data is NULL, the encoder will
4563 * allocate it. The encoder will set avpkt->size to the size
4564 * of the output packet.
4566 * If this function fails or produces no output, avpkt will be
4567 * freed using av_free_packet() (i.e. avpkt->destruct will be
4568 * called to free the user supplied buffer).
4569 * @param[in] frame AVFrame containing the raw audio data to be encoded.
4570 * May be NULL when flushing an encoder that has the
4571 * CODEC_CAP_DELAY capability set.
4572 * If CODEC_CAP_VARIABLE_FRAME_SIZE is set, then each frame
4573 * can have any number of samples.
4574 * If it is not set, frame->nb_samples must be equal to
4575 * avctx->frame_size for all frames except the last.
4576 * The final frame may be smaller than avctx->frame_size.
4577 * @param[out] got_packet_ptr This field is set to 1 by libavcodec if the
4578 * output packet is non-empty, and to 0 if it is
4579 * empty. If the function returns an error, the
4580 * packet can be assumed to be invalid, and the
4581 * value of got_packet_ptr is undefined and should
4583 * @return 0 on success, negative error code on failure
4585 int avcodec_encode_audio2(AVCodecContext *avctx, AVPacket *avpkt,
4586 const AVFrame *frame, int *got_packet_ptr);
4588 #if FF_API_OLD_ENCODE_VIDEO
4590 * @deprecated use avcodec_encode_video2() instead.
4592 * Encode a video frame from pict into buf.
4593 * The input picture should be
4594 * stored using a specific format, namely avctx.pix_fmt.
4596 * @param avctx the codec context
4597 * @param[out] buf the output buffer for the bitstream of encoded frame
4598 * @param[in] buf_size the size of the output buffer in bytes
4599 * @param[in] pict the input picture to encode
4600 * @return On error a negative value is returned, on success zero or the number
4601 * of bytes used from the output buffer.
4603 attribute_deprecated
4604 int avcodec_encode_video(AVCodecContext *avctx, uint8_t *buf, int buf_size,
4605 const AVFrame *pict);
4609 * Encode a frame of video.
4611 * Takes input raw video data from frame and writes the next output packet, if
4612 * available, to avpkt. The output packet does not necessarily contain data for
4613 * the most recent frame, as encoders can delay and reorder input frames
4614 * internally as needed.
4616 * @param avctx codec context
4617 * @param avpkt output AVPacket.
4618 * The user can supply an output buffer by setting
4619 * avpkt->data and avpkt->size prior to calling the
4620 * function, but if the size of the user-provided data is not
4621 * large enough, encoding will fail. All other AVPacket fields
4622 * will be reset by the encoder using av_init_packet(). If
4623 * avpkt->data is NULL, the encoder will allocate it.
4624 * The encoder will set avpkt->size to the size of the
4625 * output packet. The returned data (if any) belongs to the
4626 * caller, he is responsible for freeing it.
4628 * If this function fails or produces no output, avpkt will be
4629 * freed using av_free_packet() (i.e. avpkt->destruct will be
4630 * called to free the user supplied buffer).
4631 * @param[in] frame AVFrame containing the raw video data to be encoded.
4632 * May be NULL when flushing an encoder that has the
4633 * CODEC_CAP_DELAY capability set.
4634 * @param[out] got_packet_ptr This field is set to 1 by libavcodec if the
4635 * output packet is non-empty, and to 0 if it is
4636 * empty. If the function returns an error, the
4637 * packet can be assumed to be invalid, and the
4638 * value of got_packet_ptr is undefined and should
4640 * @return 0 on success, negative error code on failure
4642 int avcodec_encode_video2(AVCodecContext *avctx, AVPacket *avpkt,
4643 const AVFrame *frame, int *got_packet_ptr);
4645 int avcodec_encode_subtitle(AVCodecContext *avctx, uint8_t *buf, int buf_size,
4646 const AVSubtitle *sub);
4653 #if FF_API_AVCODEC_RESAMPLE
4655 * @defgroup lavc_resample Audio resampling
4657 * @deprecated use libswresample instead
4661 struct ReSampleContext;
4662 struct AVResampleContext;
4664 typedef struct ReSampleContext ReSampleContext;
4667 * Initialize audio resampling context.
4669 * @param output_channels number of output channels
4670 * @param input_channels number of input channels
4671 * @param output_rate output sample rate
4672 * @param input_rate input sample rate
4673 * @param sample_fmt_out requested output sample format
4674 * @param sample_fmt_in input sample format
4675 * @param filter_length length of each FIR filter in the filterbank relative to the cutoff frequency
4676 * @param log2_phase_count log2 of the number of entries in the polyphase filterbank
4677 * @param linear if 1 then the used FIR filter will be linearly interpolated
4678 between the 2 closest, if 0 the closest will be used
4679 * @param cutoff cutoff frequency, 1.0 corresponds to half the output sampling rate
4680 * @return allocated ReSampleContext, NULL if error occurred
4682 attribute_deprecated
4683 ReSampleContext *av_audio_resample_init(int output_channels, int input_channels,
4684 int output_rate, int input_rate,
4685 enum AVSampleFormat sample_fmt_out,
4686 enum AVSampleFormat sample_fmt_in,
4687 int filter_length, int log2_phase_count,
4688 int linear, double cutoff);
4690 attribute_deprecated
4691 int audio_resample(ReSampleContext *s, short *output, short *input, int nb_samples);
4694 * Free resample context.
4696 * @param s a non-NULL pointer to a resample context previously
4697 * created with av_audio_resample_init()
4699 attribute_deprecated
4700 void audio_resample_close(ReSampleContext *s);
4704 * Initialize an audio resampler.
4705 * Note, if either rate is not an integer then simply scale both rates up so they are.
4706 * @param filter_length length of each FIR filter in the filterbank relative to the cutoff freq
4707 * @param log2_phase_count log2 of the number of entries in the polyphase filterbank
4708 * @param linear If 1 then the used FIR filter will be linearly interpolated
4709 between the 2 closest, if 0 the closest will be used
4710 * @param cutoff cutoff frequency, 1.0 corresponds to half the output sampling rate
4712 attribute_deprecated
4713 struct AVResampleContext *av_resample_init(int out_rate, int in_rate, int filter_length, int log2_phase_count, int linear, double cutoff);
4716 * Resample an array of samples using a previously configured context.
4717 * @param src an array of unconsumed samples
4718 * @param consumed the number of samples of src which have been consumed are returned here
4719 * @param src_size the number of unconsumed samples available
4720 * @param dst_size the amount of space in samples available in dst
4721 * @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.
4722 * @return the number of samples written in dst or -1 if an error occurred
4724 attribute_deprecated
4725 int av_resample(struct AVResampleContext *c, short *dst, short *src, int *consumed, int src_size, int dst_size, int update_ctx);
4729 * Compensate samplerate/timestamp drift. The compensation is done by changing
4730 * the resampler parameters, so no audible clicks or similar distortions occur
4731 * @param compensation_distance distance in output samples over which the compensation should be performed
4732 * @param sample_delta number of output samples which should be output less
4734 * example: av_resample_compensate(c, 10, 500)
4735 * here instead of 510 samples only 500 samples would be output
4737 * note, due to rounding the actual compensation might be slightly different,
4738 * especially if the compensation_distance is large and the in_rate used during init is small
4740 attribute_deprecated
4741 void av_resample_compensate(struct AVResampleContext *c, int sample_delta, int compensation_distance);
4742 attribute_deprecated
4743 void av_resample_close(struct AVResampleContext *c);
4751 * @addtogroup lavc_picture
4756 * Allocate memory for the pixels of a picture and setup the AVPicture
4759 * Call avpicture_free() to free it.
4761 * @param picture the picture structure to be filled in
4762 * @param pix_fmt the pixel format of the picture
4763 * @param width the width of the picture
4764 * @param height the height of the picture
4765 * @return zero if successful, a negative error code otherwise
4767 * @see av_image_alloc(), avpicture_fill()
4769 int avpicture_alloc(AVPicture *picture, enum AVPixelFormat pix_fmt, int width, int height);
4772 * Free a picture previously allocated by avpicture_alloc().
4773 * The data buffer used by the AVPicture is freed, but the AVPicture structure
4776 * @param picture the AVPicture to be freed
4778 void avpicture_free(AVPicture *picture);
4781 * Setup the picture fields based on the specified image parameters
4782 * and the provided image data buffer.
4784 * The picture fields are filled in by using the image data buffer
4785 * pointed to by ptr.
4787 * If ptr is NULL, the function will fill only the picture linesize
4788 * array and return the required size for the image buffer.
4790 * To allocate an image buffer and fill the picture data in one call,
4791 * use avpicture_alloc().
4793 * @param picture the picture to be filled in
4794 * @param ptr buffer where the image data is stored, or NULL
4795 * @param pix_fmt the pixel format of the image
4796 * @param width the width of the image in pixels
4797 * @param height the height of the image in pixels
4798 * @return the size in bytes required for src, a negative error code
4799 * in case of failure
4801 * @see av_image_fill_arrays()
4803 int avpicture_fill(AVPicture *picture, const uint8_t *ptr,
4804 enum AVPixelFormat pix_fmt, int width, int height);
4807 * Copy pixel data from an AVPicture into a buffer.
4809 * avpicture_get_size() can be used to compute the required size for
4810 * the buffer to fill.
4812 * @param src source picture with filled data
4813 * @param pix_fmt picture pixel format
4814 * @param width picture width
4815 * @param height picture height
4816 * @param dest destination buffer
4817 * @param dest_size destination buffer size in bytes
4818 * @return the number of bytes written to dest, or a negative value
4819 * (error code) on error, for example if the destination buffer is not
4822 * @see av_image_copy_to_buffer()
4824 int avpicture_layout(const AVPicture *src, enum AVPixelFormat pix_fmt,
4825 int width, int height,
4826 unsigned char *dest, int dest_size);
4829 * Calculate the size in bytes that a picture of the given width and height
4830 * would occupy if stored in the given picture format.
4832 * @param pix_fmt picture pixel format
4833 * @param width picture width
4834 * @param height picture height
4835 * @return the computed picture buffer size or a negative error code
4838 * @see av_image_get_buffer_size().
4840 int avpicture_get_size(enum AVPixelFormat pix_fmt, int width, int height);
4842 #if FF_API_DEINTERLACE
4844 * deinterlace - if not supported return -1
4846 * @deprecated - use yadif (in libavfilter) instead
4848 attribute_deprecated
4849 int avpicture_deinterlace(AVPicture *dst, const AVPicture *src,
4850 enum AVPixelFormat pix_fmt, int width, int height);
4853 * Copy image src to dst. Wraps av_image_copy().
4855 void av_picture_copy(AVPicture *dst, const AVPicture *src,
4856 enum AVPixelFormat pix_fmt, int width, int height);
4859 * Crop image top and left side.
4861 int av_picture_crop(AVPicture *dst, const AVPicture *src,
4862 enum AVPixelFormat pix_fmt, int top_band, int left_band);
4867 int av_picture_pad(AVPicture *dst, const AVPicture *src, int height, int width, enum AVPixelFormat pix_fmt,
4868 int padtop, int padbottom, int padleft, int padright, int *color);
4875 * @defgroup lavc_misc Utility functions
4878 * Miscellaneous utility functions related to both encoding and decoding
4884 * @defgroup lavc_misc_pixfmt Pixel formats
4886 * Functions for working with pixel formats.
4891 * Utility function to access log2_chroma_w log2_chroma_h from
4892 * the pixel format AVPixFmtDescriptor.
4894 * This function asserts that pix_fmt is valid. See av_pix_fmt_get_chroma_sub_sample
4895 * for one that returns a failure code and continues in case of invalid
4898 * @param[in] pix_fmt the pixel format
4899 * @param[out] h_shift store log2_chroma_w
4900 * @param[out] v_shift store log2_chroma_h
4902 * @see av_pix_fmt_get_chroma_sub_sample
4905 void avcodec_get_chroma_sub_sample(enum AVPixelFormat pix_fmt, int *h_shift, int *v_shift);
4908 * Return a value representing the fourCC code associated to the
4909 * pixel format pix_fmt, or 0 if no associated fourCC code can be
4912 unsigned int avcodec_pix_fmt_to_codec_tag(enum AVPixelFormat pix_fmt);
4915 * @deprecated see av_get_pix_fmt_loss()
4917 int avcodec_get_pix_fmt_loss(enum AVPixelFormat dst_pix_fmt, enum AVPixelFormat src_pix_fmt,
4921 * Find the best pixel format to convert to given a certain source pixel
4922 * format. When converting from one pixel format to another, information loss
4923 * may occur. For example, when converting from RGB24 to GRAY, the color
4924 * information will be lost. Similarly, other losses occur when converting from
4925 * some formats to other formats. avcodec_find_best_pix_fmt_of_2() searches which of
4926 * the given pixel formats should be used to suffer the least amount of loss.
4927 * The pixel formats from which it chooses one, are determined by the
4928 * pix_fmt_list parameter.
4931 * @param[in] pix_fmt_list AV_PIX_FMT_NONE terminated array of pixel formats to choose from
4932 * @param[in] src_pix_fmt source pixel format
4933 * @param[in] has_alpha Whether the source pixel format alpha channel is used.
4934 * @param[out] loss_ptr Combination of flags informing you what kind of losses will occur.
4935 * @return The best pixel format to convert to or -1 if none was found.
4937 enum AVPixelFormat avcodec_find_best_pix_fmt_of_list(const enum AVPixelFormat *pix_fmt_list,
4938 enum AVPixelFormat src_pix_fmt,
4939 int has_alpha, int *loss_ptr);
4942 * @deprecated see av_find_best_pix_fmt_of_2()
4944 enum AVPixelFormat avcodec_find_best_pix_fmt_of_2(enum AVPixelFormat dst_pix_fmt1, enum AVPixelFormat dst_pix_fmt2,
4945 enum AVPixelFormat src_pix_fmt, int has_alpha, int *loss_ptr);
4947 attribute_deprecated
4948 #if AV_HAVE_INCOMPATIBLE_LIBAV_ABI
4949 enum AVPixelFormat avcodec_find_best_pix_fmt2(const enum AVPixelFormat *pix_fmt_list,
4950 enum AVPixelFormat src_pix_fmt,
4951 int has_alpha, int *loss_ptr);
4953 enum AVPixelFormat avcodec_find_best_pix_fmt2(enum AVPixelFormat dst_pix_fmt1, enum AVPixelFormat dst_pix_fmt2,
4954 enum AVPixelFormat src_pix_fmt, int has_alpha, int *loss_ptr);
4958 enum AVPixelFormat avcodec_default_get_format(struct AVCodecContext *s, const enum AVPixelFormat * fmt);
4964 #if FF_API_SET_DIMENSIONS
4966 * @deprecated this function is not supposed to be used from outside of lavc
4968 attribute_deprecated
4969 void avcodec_set_dimensions(AVCodecContext *s, int width, int height);
4973 * Put a string representing the codec tag codec_tag in buf.
4975 * @param buf buffer to place codec tag in
4976 * @param buf_size size in bytes of buf
4977 * @param codec_tag codec tag to assign
4978 * @return the length of the string that would have been generated if
4979 * enough space had been available, excluding the trailing null
4981 size_t av_get_codec_tag_string(char *buf, size_t buf_size, unsigned int codec_tag);
4983 void avcodec_string(char *buf, int buf_size, AVCodecContext *enc, int encode);
4986 * Return a name for the specified profile, if available.
4988 * @param codec the codec that is searched for the given profile
4989 * @param profile the profile value for which a name is requested
4990 * @return A name for the profile if found, NULL otherwise.
4992 const char *av_get_profile_name(const AVCodec *codec, int profile);
4994 int avcodec_default_execute(AVCodecContext *c, int (*func)(AVCodecContext *c2, void *arg2),void *arg, int *ret, int count, int size);
4995 int avcodec_default_execute2(AVCodecContext *c, int (*func)(AVCodecContext *c2, void *arg2, int, int),void *arg, int *ret, int count);
4996 //FIXME func typedef
4999 * Fill AVFrame audio data and linesize pointers.
5001 * The buffer buf must be a preallocated buffer with a size big enough
5002 * to contain the specified samples amount. The filled AVFrame data
5003 * pointers will point to this buffer.
5005 * AVFrame extended_data channel pointers are allocated if necessary for
5008 * @param frame the AVFrame
5009 * frame->nb_samples must be set prior to calling the
5010 * function. This function fills in frame->data,
5011 * frame->extended_data, frame->linesize[0].
5012 * @param nb_channels channel count
5013 * @param sample_fmt sample format
5014 * @param buf buffer to use for frame data
5015 * @param buf_size size of buffer
5016 * @param align plane size sample alignment (0 = default)
5017 * @return >=0 on success, negative error code on failure
5018 * @todo return the size in bytes required to store the samples in
5019 * case of success, at the next libavutil bump
5021 int avcodec_fill_audio_frame(AVFrame *frame, int nb_channels,
5022 enum AVSampleFormat sample_fmt, const uint8_t *buf,
5023 int buf_size, int align);
5026 * Reset the internal decoder state / flush internal buffers. Should be called
5027 * e.g. when seeking or when switching to a different stream.
5029 * @note when refcounted frames are not used (i.e. avctx->refcounted_frames is 0),
5030 * this invalidates the frames previously returned from the decoder. When
5031 * refcounted frames are used, the decoder just releases any references it might
5032 * keep internally, but the caller's reference remains valid.
5034 void avcodec_flush_buffers(AVCodecContext *avctx);
5037 * Return codec bits per sample.
5039 * @param[in] codec_id the codec
5040 * @return Number of bits per sample or zero if unknown for the given codec.
5042 int av_get_bits_per_sample(enum AVCodecID codec_id);
5045 * Return the PCM codec associated with a sample format.
5046 * @param be endianness, 0 for little, 1 for big,
5047 * -1 (or anything else) for native
5048 * @return AV_CODEC_ID_PCM_* or AV_CODEC_ID_NONE
5050 enum AVCodecID av_get_pcm_codec(enum AVSampleFormat fmt, int be);
5053 * Return codec bits per sample.
5054 * Only return non-zero if the bits per sample is exactly correct, not an
5057 * @param[in] codec_id the codec
5058 * @return Number of bits per sample or zero if unknown for the given codec.
5060 int av_get_exact_bits_per_sample(enum AVCodecID codec_id);
5063 * Return audio frame duration.
5065 * @param avctx codec context
5066 * @param frame_bytes size of the frame, or 0 if unknown
5067 * @return frame duration, in samples, if known. 0 if not able to
5070 int av_get_audio_frame_duration(AVCodecContext *avctx, int frame_bytes);
5073 typedef struct AVBitStreamFilterContext {
5075 struct AVBitStreamFilter *filter;
5076 AVCodecParserContext *parser;
5077 struct AVBitStreamFilterContext *next;
5078 } AVBitStreamFilterContext;
5081 typedef struct AVBitStreamFilter {
5084 int (*filter)(AVBitStreamFilterContext *bsfc,
5085 AVCodecContext *avctx, const char *args,
5086 uint8_t **poutbuf, int *poutbuf_size,
5087 const uint8_t *buf, int buf_size, int keyframe);
5088 void (*close)(AVBitStreamFilterContext *bsfc);
5089 struct AVBitStreamFilter *next;
5090 } AVBitStreamFilter;
5093 * Register a bitstream filter.
5095 * The filter will be accessible to the application code through
5096 * av_bitstream_filter_next() or can be directly initialized with
5097 * av_bitstream_filter_init().
5099 * @see avcodec_register_all()
5101 void av_register_bitstream_filter(AVBitStreamFilter *bsf);
5104 * Create and initialize a bitstream filter context given a bitstream
5107 * The returned context must be freed with av_bitstream_filter_close().
5109 * @param name the name of the bitstream filter
5110 * @return a bitstream filter context if a matching filter was found
5111 * and successfully initialized, NULL otherwise
5113 AVBitStreamFilterContext *av_bitstream_filter_init(const char *name);
5118 * This function filters the buffer buf with size buf_size, and places the
5119 * filtered buffer in the buffer pointed to by poutbuf.
5121 * The output buffer must be freed by the caller.
5123 * @param bsfc bitstream filter context created by av_bitstream_filter_init()
5124 * @param avctx AVCodecContext accessed by the filter, may be NULL.
5125 * If specified, this must point to the encoder context of the
5126 * output stream the packet is sent to.
5127 * @param args arguments which specify the filter configuration, may be NULL
5128 * @param poutbuf pointer which is updated to point to the filtered buffer
5129 * @param poutbuf_size pointer which is updated to the filtered buffer size in bytes
5130 * @param buf buffer containing the data to filter
5131 * @param buf_size size in bytes of buf
5132 * @param keyframe set to non-zero if the buffer to filter corresponds to a key-frame packet data
5133 * @return >= 0 in case of success, or a negative error code in case of failure
5135 * If the return value is positive, an output buffer is allocated and
5136 * is available in *poutbuf, and is distinct from the input buffer.
5138 * If the return value is 0, the output buffer is not allocated and
5139 * should be considered identical to the input buffer, or in case
5140 * *poutbuf was set it points to the input buffer (not necessarily to
5141 * its starting address).
5143 int av_bitstream_filter_filter(AVBitStreamFilterContext *bsfc,
5144 AVCodecContext *avctx, const char *args,
5145 uint8_t **poutbuf, int *poutbuf_size,
5146 const uint8_t *buf, int buf_size, int keyframe);
5149 * Release bitstream filter context.
5151 * @param bsf the bitstream filter context created with
5152 * av_bitstream_filter_init(), can be NULL
5154 void av_bitstream_filter_close(AVBitStreamFilterContext *bsf);
5157 * If f is NULL, return the first registered bitstream filter,
5158 * if f is non-NULL, return the next registered bitstream filter
5159 * after f, or NULL if f is the last one.
5161 * This function can be used to iterate over all registered bitstream
5164 AVBitStreamFilter *av_bitstream_filter_next(const AVBitStreamFilter *f);
5169 * Same behaviour av_fast_malloc but the buffer has additional
5170 * FF_INPUT_BUFFER_PADDING_SIZE at the end which will always be 0.
5172 * In addition the whole buffer will initially and after resizes
5173 * be 0-initialized so that no uninitialized data will ever appear.
5175 void av_fast_padded_malloc(void *ptr, unsigned int *size, size_t min_size);
5178 * Same behaviour av_fast_padded_malloc except that buffer will always
5179 * be 0-initialized after call.
5181 void av_fast_padded_mallocz(void *ptr, unsigned int *size, size_t min_size);
5184 * Encode extradata length to a buffer. Used by xiph codecs.
5186 * @param s buffer to write to; must be at least (v/255+1) bytes long
5187 * @param v size of extradata in bytes
5188 * @return number of bytes written to the buffer.
5190 unsigned int av_xiphlacing(unsigned char *s, unsigned int v);
5192 #if FF_API_MISSING_SAMPLE
5194 * Log a generic warning message about a missing feature. This function is
5195 * intended to be used internally by FFmpeg (libavcodec, libavformat, etc.)
5196 * only, and would normally not be used by applications.
5197 * @param[in] avc a pointer to an arbitrary struct of which the first field is
5198 * a pointer to an AVClass struct
5199 * @param[in] feature string containing the name of the missing feature
5200 * @param[in] want_sample indicates if samples are wanted which exhibit this feature.
5201 * If want_sample is non-zero, additional verbage will be added to the log
5202 * message which tells the user how to report samples to the development
5204 * @deprecated Use avpriv_report_missing_feature() instead.
5206 attribute_deprecated
5207 void av_log_missing_feature(void *avc, const char *feature, int want_sample);
5210 * Log a generic warning message asking for a sample. This function is
5211 * intended to be used internally by FFmpeg (libavcodec, libavformat, etc.)
5212 * only, and would normally not be used by applications.
5213 * @param[in] avc a pointer to an arbitrary struct of which the first field is
5214 * a pointer to an AVClass struct
5215 * @param[in] msg string containing an optional message, or NULL if no message
5216 * @deprecated Use avpriv_request_sample() instead.
5218 attribute_deprecated
5219 void av_log_ask_for_sample(void *avc, const char *msg, ...) av_printf_format(2, 3);
5220 #endif /* FF_API_MISSING_SAMPLE */
5223 * Register the hardware accelerator hwaccel.
5225 void av_register_hwaccel(AVHWAccel *hwaccel);
5228 * If hwaccel is NULL, returns the first registered hardware accelerator,
5229 * if hwaccel is non-NULL, returns the next registered hardware accelerator
5230 * after hwaccel, or NULL if hwaccel is the last one.
5232 AVHWAccel *av_hwaccel_next(const AVHWAccel *hwaccel);
5236 * Lock operation used by lockmgr
5239 AV_LOCK_CREATE, ///< Create a mutex
5240 AV_LOCK_OBTAIN, ///< Lock the mutex
5241 AV_LOCK_RELEASE, ///< Unlock the mutex
5242 AV_LOCK_DESTROY, ///< Free mutex resources
5246 * Register a user provided lock manager supporting the operations
5247 * specified by AVLockOp. The "mutex" argument to the function points
5248 * to a (void *) where the lockmgr should store/get a pointer to a user
5249 * allocated mutex. It is NULL upon AV_LOCK_CREATE and equal to the
5250 * value left by the last call for all other ops. If the lock manager is
5251 * unable to perform the op then it should leave the mutex in the same
5252 * state as when it was called and return a non-zero value. However,
5253 * when called with AV_LOCK_DESTROY the mutex will always be assumed to
5254 * have been successfully destroyed. If av_lockmgr_register succeeds
5255 * it will return a non-negative value, if it fails it will return a
5256 * negative value and destroy all mutex and unregister all callbacks.
5257 * av_lockmgr_register is not thread-safe, it must be called from a
5258 * single thread before any calls which make use of locking are used.
5260 * @param cb User defined callback. av_lockmgr_register invokes calls
5261 * to this callback and the previously registered callback.
5262 * The callback will be used to create more than one mutex
5263 * each of which must be backed by its own underlying locking
5264 * mechanism (i.e. do not use a single static object to
5265 * implement your lock manager). If cb is set to NULL the
5266 * lockmgr will be unregistered.
5268 int av_lockmgr_register(int (*cb)(void **mutex, enum AVLockOp op));
5271 * Get the type of the given codec.
5273 enum AVMediaType avcodec_get_type(enum AVCodecID codec_id);
5276 * Get the name of a codec.
5277 * @return a static string identifying the codec; never NULL
5279 const char *avcodec_get_name(enum AVCodecID id);
5282 * @return a positive value if s is open (i.e. avcodec_open2() was called on it
5283 * with no corresponding avcodec_close()), 0 otherwise.
5285 int avcodec_is_open(AVCodecContext *s);
5288 * @return a non-zero number if codec is an encoder, zero otherwise
5290 int av_codec_is_encoder(const AVCodec *codec);
5293 * @return a non-zero number if codec is a decoder, zero otherwise
5295 int av_codec_is_decoder(const AVCodec *codec);
5298 * @return descriptor for given codec ID or NULL if no descriptor exists.
5300 const AVCodecDescriptor *avcodec_descriptor_get(enum AVCodecID id);
5303 * Iterate over all codec descriptors known to libavcodec.
5305 * @param prev previous descriptor. NULL to get the first descriptor.
5307 * @return next descriptor or NULL after the last descriptor
5309 const AVCodecDescriptor *avcodec_descriptor_next(const AVCodecDescriptor *prev);
5312 * @return codec descriptor with the given name or NULL if no such descriptor
5315 const AVCodecDescriptor *avcodec_descriptor_get_by_name(const char *name);
5321 #endif /* AVCODEC_AVCODEC_H */