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
108 AV_CODEC_ID_MPEG2VIDEO_XVMC,
119 AV_CODEC_ID_RAWVIDEO,
120 AV_CODEC_ID_MSMPEG4V1,
121 AV_CODEC_ID_MSMPEG4V2,
122 AV_CODEC_ID_MSMPEG4V3,
145 AV_CODEC_ID_INTERPLAY_VIDEO,
152 AV_CODEC_ID_MSVIDEO1,
157 AV_CODEC_ID_TRUEMOTION1,
158 AV_CODEC_ID_VMDVIDEO,
183 AV_CODEC_ID_TRUEMOTION2,
189 AV_CODEC_ID_SMACKVIDEO,
194 AV_CODEC_ID_JPEG2000,
200 AV_CODEC_ID_DSICINVIDEO,
201 AV_CODEC_ID_TIERTEXSEQVIDEO,
209 AV_CODEC_ID_BETHSOFTVID,
221 AV_CODEC_ID_ESCAPE124,
225 AV_CODEC_ID_MOTIONPIXELS,
237 AV_CODEC_ID_FLASHSV2,
238 AV_CODEC_ID_CDGRAPHICS,
241 AV_CODEC_ID_BINKVIDEO,
242 AV_CODEC_ID_IFF_ILBM,
243 AV_CODEC_ID_IFF_BYTERUN1,
249 AV_CODEC_ID_A64_MULTI,
250 AV_CODEC_ID_A64_MULTI5,
253 AV_CODEC_ID_LAGARITH,
257 AV_CODEC_ID_WMV3IMAGE,
258 AV_CODEC_ID_VC1IMAGE,
260 AV_CODEC_ID_BMV_VIDEO,
267 AV_CODEC_ID_ZEROCODEC,
276 AV_CODEC_ID_ESCAPE130_DEPRECATED,
277 AV_CODEC_ID_G2M_DEPRECATED,
279 AV_CODEC_ID_BRENDER_PIX= MKBETAG('B','P','I','X'),
280 AV_CODEC_ID_Y41P = MKBETAG('Y','4','1','P'),
281 AV_CODEC_ID_ESCAPE130 = MKBETAG('E','1','3','0'),
282 AV_CODEC_ID_EXR = MKBETAG('0','E','X','R'),
283 AV_CODEC_ID_AVRP = MKBETAG('A','V','R','P'),
285 AV_CODEC_ID_012V = MKBETAG('0','1','2','V'),
286 AV_CODEC_ID_G2M = MKBETAG( 0 ,'G','2','M'),
287 AV_CODEC_ID_AVUI = MKBETAG('A','V','U','I'),
288 AV_CODEC_ID_AYUV = MKBETAG('A','Y','U','V'),
289 AV_CODEC_ID_TARGA_Y216 = MKBETAG('T','2','1','6'),
290 AV_CODEC_ID_V308 = MKBETAG('V','3','0','8'),
291 AV_CODEC_ID_V408 = MKBETAG('V','4','0','8'),
292 AV_CODEC_ID_YUV4 = MKBETAG('Y','U','V','4'),
293 AV_CODEC_ID_SANM = MKBETAG('S','A','N','M'),
294 AV_CODEC_ID_PAF_VIDEO = MKBETAG('P','A','F','V'),
295 AV_CODEC_ID_AVRN = MKBETAG('A','V','R','n'),
296 AV_CODEC_ID_CPIA = MKBETAG('C','P','I','A'),
297 AV_CODEC_ID_XFACE = MKBETAG('X','F','A','C'),
298 AV_CODEC_ID_SGIRLE = MKBETAG('S','G','I','R'),
299 AV_CODEC_ID_MVC1 = MKBETAG('M','V','C','1'),
300 AV_CODEC_ID_MVC2 = MKBETAG('M','V','C','2'),
301 AV_CODEC_ID_SNOW = MKBETAG('S','N','O','W'),
302 AV_CODEC_ID_WEBP = MKBETAG('W','E','B','P'),
303 AV_CODEC_ID_SMVJPEG = MKBETAG('S','M','V','J'),
304 AV_CODEC_ID_H265 = MKBETAG('H','2','6','5'),
306 /* various PCM "codecs" */
307 AV_CODEC_ID_FIRST_AUDIO = 0x10000, ///< A dummy id pointing at the start of audio codecs
308 AV_CODEC_ID_PCM_S16LE = 0x10000,
309 AV_CODEC_ID_PCM_S16BE,
310 AV_CODEC_ID_PCM_U16LE,
311 AV_CODEC_ID_PCM_U16BE,
314 AV_CODEC_ID_PCM_MULAW,
315 AV_CODEC_ID_PCM_ALAW,
316 AV_CODEC_ID_PCM_S32LE,
317 AV_CODEC_ID_PCM_S32BE,
318 AV_CODEC_ID_PCM_U32LE,
319 AV_CODEC_ID_PCM_U32BE,
320 AV_CODEC_ID_PCM_S24LE,
321 AV_CODEC_ID_PCM_S24BE,
322 AV_CODEC_ID_PCM_U24LE,
323 AV_CODEC_ID_PCM_U24BE,
324 AV_CODEC_ID_PCM_S24DAUD,
325 AV_CODEC_ID_PCM_ZORK,
326 AV_CODEC_ID_PCM_S16LE_PLANAR,
328 AV_CODEC_ID_PCM_F32BE,
329 AV_CODEC_ID_PCM_F32LE,
330 AV_CODEC_ID_PCM_F64BE,
331 AV_CODEC_ID_PCM_F64LE,
332 AV_CODEC_ID_PCM_BLURAY,
335 AV_CODEC_ID_PCM_S8_PLANAR,
336 AV_CODEC_ID_PCM_S24LE_PLANAR = MKBETAG(24,'P','S','P'),
337 AV_CODEC_ID_PCM_S32LE_PLANAR = MKBETAG(32,'P','S','P'),
338 AV_CODEC_ID_PCM_S16BE_PLANAR = MKBETAG('P','S','P',16),
340 /* various ADPCM codecs */
341 AV_CODEC_ID_ADPCM_IMA_QT = 0x11000,
342 AV_CODEC_ID_ADPCM_IMA_WAV,
343 AV_CODEC_ID_ADPCM_IMA_DK3,
344 AV_CODEC_ID_ADPCM_IMA_DK4,
345 AV_CODEC_ID_ADPCM_IMA_WS,
346 AV_CODEC_ID_ADPCM_IMA_SMJPEG,
347 AV_CODEC_ID_ADPCM_MS,
348 AV_CODEC_ID_ADPCM_4XM,
349 AV_CODEC_ID_ADPCM_XA,
350 AV_CODEC_ID_ADPCM_ADX,
351 AV_CODEC_ID_ADPCM_EA,
352 AV_CODEC_ID_ADPCM_G726,
353 AV_CODEC_ID_ADPCM_CT,
354 AV_CODEC_ID_ADPCM_SWF,
355 AV_CODEC_ID_ADPCM_YAMAHA,
356 AV_CODEC_ID_ADPCM_SBPRO_4,
357 AV_CODEC_ID_ADPCM_SBPRO_3,
358 AV_CODEC_ID_ADPCM_SBPRO_2,
359 AV_CODEC_ID_ADPCM_THP,
360 AV_CODEC_ID_ADPCM_IMA_AMV,
361 AV_CODEC_ID_ADPCM_EA_R1,
362 AV_CODEC_ID_ADPCM_EA_R3,
363 AV_CODEC_ID_ADPCM_EA_R2,
364 AV_CODEC_ID_ADPCM_IMA_EA_SEAD,
365 AV_CODEC_ID_ADPCM_IMA_EA_EACS,
366 AV_CODEC_ID_ADPCM_EA_XAS,
367 AV_CODEC_ID_ADPCM_EA_MAXIS_XA,
368 AV_CODEC_ID_ADPCM_IMA_ISS,
369 AV_CODEC_ID_ADPCM_G722,
370 AV_CODEC_ID_ADPCM_IMA_APC,
371 AV_CODEC_ID_VIMA = MKBETAG('V','I','M','A'),
372 AV_CODEC_ID_ADPCM_AFC = MKBETAG('A','F','C',' '),
373 AV_CODEC_ID_ADPCM_IMA_OKI = MKBETAG('O','K','I',' '),
374 AV_CODEC_ID_ADPCM_DTK = MKBETAG('D','T','K',' '),
375 AV_CODEC_ID_ADPCM_IMA_RAD = MKBETAG('R','A','D',' '),
378 AV_CODEC_ID_AMR_NB = 0x12000,
381 /* RealAudio codecs*/
382 AV_CODEC_ID_RA_144 = 0x13000,
385 /* various DPCM codecs */
386 AV_CODEC_ID_ROQ_DPCM = 0x14000,
387 AV_CODEC_ID_INTERPLAY_DPCM,
388 AV_CODEC_ID_XAN_DPCM,
389 AV_CODEC_ID_SOL_DPCM,
392 AV_CODEC_ID_MP2 = 0x15000,
393 AV_CODEC_ID_MP3, ///< preferred ID for decoding MPEG audio layer 1, 2 or 3
403 AV_CODEC_ID_VMDAUDIO,
409 AV_CODEC_ID_WESTWOOD_SND1,
410 AV_CODEC_ID_GSM, ///< as in Berlin toast format
413 AV_CODEC_ID_TRUESPEECH,
415 AV_CODEC_ID_SMACKAUDIO,
418 AV_CODEC_ID_DSICINAUDIO,
420 AV_CODEC_ID_MUSEPACK7,
422 AV_CODEC_ID_GSM_MS, /* as found in WAV */
428 AV_CODEC_ID_NELLYMOSER,
429 AV_CODEC_ID_MUSEPACK8,
431 AV_CODEC_ID_WMAVOICE,
433 AV_CODEC_ID_WMALOSSLESS,
442 AV_CODEC_ID_BINKAUDIO_RDFT,
443 AV_CODEC_ID_BINKAUDIO_DCT,
444 AV_CODEC_ID_AAC_LATM,
449 AV_CODEC_ID_8SVX_EXP,
450 AV_CODEC_ID_8SVX_FIB,
451 AV_CODEC_ID_BMV_AUDIO,
455 AV_CODEC_ID_OPUS_DEPRECATED,
456 AV_CODEC_ID_COMFORT_NOISE,
457 AV_CODEC_ID_TAK_DEPRECATED,
458 AV_CODEC_ID_METASOUND,
459 AV_CODEC_ID_FFWAVESYNTH = MKBETAG('F','F','W','S'),
460 AV_CODEC_ID_SONIC = MKBETAG('S','O','N','C'),
461 AV_CODEC_ID_SONIC_LS = MKBETAG('S','O','N','L'),
462 AV_CODEC_ID_PAF_AUDIO = MKBETAG('P','A','F','A'),
463 AV_CODEC_ID_OPUS = MKBETAG('O','P','U','S'),
464 AV_CODEC_ID_TAK = MKBETAG('t','B','a','K'),
465 AV_CODEC_ID_EVRC = MKBETAG('s','e','v','c'),
466 AV_CODEC_ID_SMV = MKBETAG('s','s','m','v'),
468 /* subtitle codecs */
469 AV_CODEC_ID_FIRST_SUBTITLE = 0x17000, ///< A dummy ID pointing at the start of subtitle codecs.
470 AV_CODEC_ID_DVD_SUBTITLE = 0x17000,
471 AV_CODEC_ID_DVB_SUBTITLE,
472 AV_CODEC_ID_TEXT, ///< raw UTF-8 text
475 AV_CODEC_ID_MOV_TEXT,
476 AV_CODEC_ID_HDMV_PGS_SUBTITLE,
477 AV_CODEC_ID_DVB_TELETEXT,
479 AV_CODEC_ID_MICRODVD = MKBETAG('m','D','V','D'),
480 AV_CODEC_ID_EIA_608 = MKBETAG('c','6','0','8'),
481 AV_CODEC_ID_JACOSUB = MKBETAG('J','S','U','B'),
482 AV_CODEC_ID_SAMI = MKBETAG('S','A','M','I'),
483 AV_CODEC_ID_REALTEXT = MKBETAG('R','T','X','T'),
484 AV_CODEC_ID_SUBVIEWER1 = MKBETAG('S','b','V','1'),
485 AV_CODEC_ID_SUBVIEWER = MKBETAG('S','u','b','V'),
486 AV_CODEC_ID_SUBRIP = MKBETAG('S','R','i','p'),
487 AV_CODEC_ID_WEBVTT = MKBETAG('W','V','T','T'),
488 AV_CODEC_ID_MPL2 = MKBETAG('M','P','L','2'),
489 AV_CODEC_ID_VPLAYER = MKBETAG('V','P','l','r'),
490 AV_CODEC_ID_PJS = MKBETAG('P','h','J','S'),
491 AV_CODEC_ID_ASS = MKBETAG('A','S','S',' '), ///< ASS as defined in Matroska
493 /* other specific kind of codecs (generally used for attachments) */
494 AV_CODEC_ID_FIRST_UNKNOWN = 0x18000, ///< A dummy ID pointing at the start of various fake codecs.
495 AV_CODEC_ID_TTF = 0x18000,
496 AV_CODEC_ID_BINTEXT = MKBETAG('B','T','X','T'),
497 AV_CODEC_ID_XBIN = MKBETAG('X','B','I','N'),
498 AV_CODEC_ID_IDF = MKBETAG( 0 ,'I','D','F'),
499 AV_CODEC_ID_OTF = MKBETAG( 0 ,'O','T','F'),
500 AV_CODEC_ID_SMPTE_KLV = MKBETAG('K','L','V','A'),
501 AV_CODEC_ID_DVD_NAV = MKBETAG('D','N','A','V'),
504 AV_CODEC_ID_PROBE = 0x19000, ///< codec_id is not known (like AV_CODEC_ID_NONE) but lavf should attempt to identify it
506 AV_CODEC_ID_MPEG2TS = 0x20000, /**< _FAKE_ codec to indicate a raw MPEG-2 TS
507 * stream (only used by libavformat) */
508 AV_CODEC_ID_MPEG4SYSTEMS = 0x20001, /**< _FAKE_ codec to indicate a MPEG-4 Systems
509 * stream (only used by libavformat) */
510 AV_CODEC_ID_FFMETADATA = 0x21000, ///< Dummy codec for streams containing only metadata information.
513 #include "old_codec_ids.h"
518 * This struct describes the properties of a single codec described by an
520 * @see avcodec_get_descriptor()
522 typedef struct AVCodecDescriptor {
524 enum AVMediaType type;
526 * Name of the codec described by this descriptor. It is non-empty and
527 * unique for each codec descriptor. It should contain alphanumeric
528 * characters and '_' only.
532 * A more descriptive name for this codec. May be NULL.
534 const char *long_name;
536 * Codec properties, a combination of AV_CODEC_PROP_* flags.
542 * Codec uses only intra compression.
545 #define AV_CODEC_PROP_INTRA_ONLY (1 << 0)
547 * Codec supports lossy compression. Audio and video codecs only.
548 * @note a codec may support both lossy and lossless
551 #define AV_CODEC_PROP_LOSSY (1 << 1)
553 * Codec supports lossless compression. Audio and video codecs only.
555 #define AV_CODEC_PROP_LOSSLESS (1 << 2)
557 * Subtitle codec is bitmap based
558 * Decoded AVSubtitle data can be read from the AVSubtitleRect->pict field.
560 #define AV_CODEC_PROP_BITMAP_SUB (1 << 16)
562 * Subtitle codec is text based.
563 * Decoded AVSubtitle data can be read from the AVSubtitleRect->ass field.
565 #define AV_CODEC_PROP_TEXT_SUB (1 << 17)
568 * @ingroup lavc_decoding
569 * Required number of additionally allocated bytes at the end of the input bitstream for decoding.
570 * This is mainly needed because some optimized bitstream readers read
571 * 32 or 64 bit at once and could read over the end.<br>
572 * Note: If the first 23 bits of the additional bytes are not 0, then damaged
573 * MPEG bitstreams could cause overread and segfault.
575 #define FF_INPUT_BUFFER_PADDING_SIZE 16
578 * @ingroup lavc_encoding
579 * minimum encoding buffer size
580 * Used to avoid some checks during header writing.
582 #define FF_MIN_BUFFER_SIZE 16384
586 * @ingroup lavc_encoding
587 * motion estimation type.
590 ME_ZERO = 1, ///< no search, that is use 0,0 vector whenever one is needed
594 ME_EPZS, ///< enhanced predictive zonal search
595 ME_X1, ///< reserved for experiments
596 ME_HEX, ///< hexagon based search
597 ME_UMH, ///< uneven multi-hexagon search
598 ME_TESA, ///< transformed exhaustive search algorithm
599 ME_ITER=50, ///< iterative search
603 * @ingroup lavc_decoding
606 /* We leave some space between them for extensions (drop some
607 * keyframes for intra-only or drop just some bidir frames). */
608 AVDISCARD_NONE =-16, ///< discard nothing
609 AVDISCARD_DEFAULT = 0, ///< discard useless packets like 0 size packets in avi
610 AVDISCARD_NONREF = 8, ///< discard all non reference
611 AVDISCARD_BIDIR = 16, ///< discard all bidirectional frames
612 AVDISCARD_NONKEY = 32, ///< discard all frames except keyframes
613 AVDISCARD_ALL = 48, ///< discard all
616 enum AVColorPrimaries{
617 AVCOL_PRI_BT709 = 1, ///< also ITU-R BT1361 / IEC 61966-2-4 / SMPTE RP177 Annex B
618 AVCOL_PRI_UNSPECIFIED = 2,
619 AVCOL_PRI_BT470M = 4,
620 AVCOL_PRI_BT470BG = 5, ///< also ITU-R BT601-6 625 / ITU-R BT1358 625 / ITU-R BT1700 625 PAL & SECAM
621 AVCOL_PRI_SMPTE170M = 6, ///< also ITU-R BT601-6 525 / ITU-R BT1358 525 / ITU-R BT1700 NTSC
622 AVCOL_PRI_SMPTE240M = 7, ///< functionally identical to above
624 AVCOL_PRI_NB , ///< Not part of ABI
627 enum AVColorTransferCharacteristic{
628 AVCOL_TRC_BT709 = 1, ///< also ITU-R BT1361
629 AVCOL_TRC_UNSPECIFIED = 2,
630 AVCOL_TRC_GAMMA22 = 4, ///< also ITU-R BT470M / ITU-R BT1700 625 PAL & SECAM
631 AVCOL_TRC_GAMMA28 = 5, ///< also ITU-R BT470BG
632 AVCOL_TRC_SMPTE240M = 7,
633 AVCOL_TRC_NB , ///< Not part of ABI
637 * X X 3 4 X X are luma samples,
638 * 1 2 1-6 are possible chroma positions
639 * X X 5 6 X 0 is undefined/unknown position
641 enum AVChromaLocation{
642 AVCHROMA_LOC_UNSPECIFIED = 0,
643 AVCHROMA_LOC_LEFT = 1, ///< mpeg2/4, h264 default
644 AVCHROMA_LOC_CENTER = 2, ///< mpeg1, jpeg, h263
645 AVCHROMA_LOC_TOPLEFT = 3, ///< DV
646 AVCHROMA_LOC_TOP = 4,
647 AVCHROMA_LOC_BOTTOMLEFT = 5,
648 AVCHROMA_LOC_BOTTOM = 6,
649 AVCHROMA_LOC_NB , ///< Not part of ABI
652 enum AVAudioServiceType {
653 AV_AUDIO_SERVICE_TYPE_MAIN = 0,
654 AV_AUDIO_SERVICE_TYPE_EFFECTS = 1,
655 AV_AUDIO_SERVICE_TYPE_VISUALLY_IMPAIRED = 2,
656 AV_AUDIO_SERVICE_TYPE_HEARING_IMPAIRED = 3,
657 AV_AUDIO_SERVICE_TYPE_DIALOGUE = 4,
658 AV_AUDIO_SERVICE_TYPE_COMMENTARY = 5,
659 AV_AUDIO_SERVICE_TYPE_EMERGENCY = 6,
660 AV_AUDIO_SERVICE_TYPE_VOICE_OVER = 7,
661 AV_AUDIO_SERVICE_TYPE_KARAOKE = 8,
662 AV_AUDIO_SERVICE_TYPE_NB , ///< Not part of ABI
666 * @ingroup lavc_encoding
668 typedef struct RcOverride{
671 int qscale; // If this is 0 then quality_factor will be used instead.
672 float quality_factor;
675 #define FF_MAX_B_FRAMES 16
678 These flags can be passed in AVCodecContext.flags before initialization.
679 Note: Not everything is supported yet.
683 * Allow decoders to produce frames with data planes that are not aligned
684 * to CPU requirements (e.g. due to cropping).
686 #define CODEC_FLAG_UNALIGNED 0x0001
687 #define CODEC_FLAG_QSCALE 0x0002 ///< Use fixed qscale.
688 #define CODEC_FLAG_4MV 0x0004 ///< 4 MV per MB allowed / advanced prediction for H.263.
689 #define CODEC_FLAG_QPEL 0x0010 ///< Use qpel MC.
690 #define CODEC_FLAG_GMC 0x0020 ///< Use GMC.
691 #define CODEC_FLAG_MV0 0x0040 ///< Always try a MB with MV=<0,0>.
693 * The parent program guarantees that the input for B-frames containing
694 * streams is not written to for at least s->max_b_frames+1 frames, if
695 * this is not set the input will be copied.
697 #define CODEC_FLAG_INPUT_PRESERVED 0x0100
698 #define CODEC_FLAG_PASS1 0x0200 ///< Use internal 2pass ratecontrol in first pass mode.
699 #define CODEC_FLAG_PASS2 0x0400 ///< Use internal 2pass ratecontrol in second pass mode.
700 #define CODEC_FLAG_GRAY 0x2000 ///< Only decode/encode grayscale.
701 #define CODEC_FLAG_EMU_EDGE 0x4000 ///< Don't draw edges.
702 #define CODEC_FLAG_PSNR 0x8000 ///< error[?] variables will be set during encoding.
703 #define CODEC_FLAG_TRUNCATED 0x00010000 /** Input bitstream might be truncated at a random
704 location instead of only at frame boundaries. */
705 #define CODEC_FLAG_NORMALIZE_AQP 0x00020000 ///< Normalize adaptive quantization.
706 #define CODEC_FLAG_INTERLACED_DCT 0x00040000 ///< Use interlaced DCT.
707 #define CODEC_FLAG_LOW_DELAY 0x00080000 ///< Force low delay.
708 #define CODEC_FLAG_GLOBAL_HEADER 0x00400000 ///< Place global headers in extradata instead of every keyframe.
709 #define CODEC_FLAG_BITEXACT 0x00800000 ///< Use only bitexact stuff (except (I)DCT).
710 /* Fx : Flag for h263+ extra options */
711 #define CODEC_FLAG_AC_PRED 0x01000000 ///< H.263 advanced intra coding / MPEG-4 AC prediction
712 #define CODEC_FLAG_LOOP_FILTER 0x00000800 ///< loop filter
713 #define CODEC_FLAG_INTERLACED_ME 0x20000000 ///< interlaced motion estimation
714 #define CODEC_FLAG_CLOSED_GOP 0x80000000
715 #define CODEC_FLAG2_FAST 0x00000001 ///< Allow non spec compliant speedup tricks.
716 #define CODEC_FLAG2_NO_OUTPUT 0x00000004 ///< Skip bitstream encoding.
717 #define CODEC_FLAG2_LOCAL_HEADER 0x00000008 ///< Place global headers at every keyframe instead of in extradata.
718 #define CODEC_FLAG2_DROP_FRAME_TIMECODE 0x00002000 ///< timecode is in drop frame format. DEPRECATED!!!!
719 #define CODEC_FLAG2_IGNORE_CROP 0x00010000 ///< Discard cropping information from SPS.
721 #define CODEC_FLAG2_CHUNKS 0x00008000 ///< Input bitstream might be truncated at a packet boundaries instead of only at frame boundaries.
722 #define CODEC_FLAG2_SHOW_ALL 0x00400000 ///< Show all frames before the first keyframe
724 /* Unsupported options :
725 * Syntax Arithmetic coding (SAC)
726 * Reference Picture Selection
727 * Independent Segment Decoding */
729 /* codec capabilities */
731 #define CODEC_CAP_DRAW_HORIZ_BAND 0x0001 ///< Decoder can use draw_horiz_band callback.
733 * Codec uses get_buffer() for allocating buffers and supports custom allocators.
734 * If not set, it might not use get_buffer() at all or use operations that
735 * assume the buffer was allocated by avcodec_default_get_buffer.
737 #define CODEC_CAP_DR1 0x0002
738 #define CODEC_CAP_TRUNCATED 0x0008
739 /* Codec can export data for HW decoding (XvMC). */
740 #define CODEC_CAP_HWACCEL 0x0010
742 * Encoder or decoder requires flushing with NULL input at the end in order to
743 * give the complete and correct output.
745 * NOTE: If this flag is not set, the codec is guaranteed to never be fed with
746 * with NULL data. The user can still send NULL data to the public encode
747 * or decode function, but libavcodec will not pass it along to the codec
748 * unless this flag is set.
751 * The decoder has a non-zero delay and needs to be fed with avpkt->data=NULL,
752 * avpkt->size=0 at the end to get the delayed data until the decoder no longer
756 * The encoder needs to be fed with NULL data at the end of encoding until the
757 * encoder no longer returns data.
759 * NOTE: For encoders implementing the AVCodec.encode2() function, setting this
760 * flag also means that the encoder must set the pts and duration for
761 * each output packet. If this flag is not set, the pts and duration will
762 * be determined by libavcodec from the input frame.
764 #define CODEC_CAP_DELAY 0x0020
766 * Codec can be fed a final frame with a smaller size.
767 * This can be used to prevent truncation of the last audio samples.
769 #define CODEC_CAP_SMALL_LAST_FRAME 0x0040
772 * Codec can export data for HW decoding (VDPAU).
774 #define CODEC_CAP_HWACCEL_VDPAU 0x0080
777 * Codec can output multiple frames per AVPacket
778 * Normally demuxers return one frame at a time, demuxers which do not do
779 * are connected to a parser to split what they return into proper frames.
780 * This flag is reserved to the very rare category of codecs which have a
781 * bitstream that cannot be split into frames without timeconsuming
782 * operations like full decoding. Demuxers carring such bitstreams thus
783 * may return multiple frames in a packet. This has many disadvantages like
784 * prohibiting stream copy in many cases thus it should only be considered
787 #define CODEC_CAP_SUBFRAMES 0x0100
789 * Codec is experimental and is thus avoided in favor of non experimental
792 #define CODEC_CAP_EXPERIMENTAL 0x0200
794 * Codec should fill in channel configuration and samplerate instead of container
796 #define CODEC_CAP_CHANNEL_CONF 0x0400
799 * Codec is able to deal with negative linesizes
801 #define CODEC_CAP_NEG_LINESIZES 0x0800
804 * Codec supports frame-level multithreading.
806 #define CODEC_CAP_FRAME_THREADS 0x1000
808 * Codec supports slice-based (or partition-based) multithreading.
810 #define CODEC_CAP_SLICE_THREADS 0x2000
812 * Codec supports changed parameters at any point.
814 #define CODEC_CAP_PARAM_CHANGE 0x4000
816 * Codec supports avctx->thread_count == 0 (auto).
818 #define CODEC_CAP_AUTO_THREADS 0x8000
820 * Audio encoder supports receiving a different number of samples in each call.
822 #define CODEC_CAP_VARIABLE_FRAME_SIZE 0x10000
824 * Codec is intra only.
826 #define CODEC_CAP_INTRA_ONLY 0x40000000
830 #define CODEC_CAP_LOSSLESS 0x80000000
832 //The following defines may change, don't expect compatibility if you use them.
833 #define MB_TYPE_INTRA4x4 0x0001
834 #define MB_TYPE_INTRA16x16 0x0002 //FIXME H.264-specific
835 #define MB_TYPE_INTRA_PCM 0x0004 //FIXME H.264-specific
836 #define MB_TYPE_16x16 0x0008
837 #define MB_TYPE_16x8 0x0010
838 #define MB_TYPE_8x16 0x0020
839 #define MB_TYPE_8x8 0x0040
840 #define MB_TYPE_INTERLACED 0x0080
841 #define MB_TYPE_DIRECT2 0x0100 //FIXME
842 #define MB_TYPE_ACPRED 0x0200
843 #define MB_TYPE_GMC 0x0400
844 #define MB_TYPE_SKIP 0x0800
845 #define MB_TYPE_P0L0 0x1000
846 #define MB_TYPE_P1L0 0x2000
847 #define MB_TYPE_P0L1 0x4000
848 #define MB_TYPE_P1L1 0x8000
849 #define MB_TYPE_L0 (MB_TYPE_P0L0 | MB_TYPE_P1L0)
850 #define MB_TYPE_L1 (MB_TYPE_P0L1 | MB_TYPE_P1L1)
851 #define MB_TYPE_L0L1 (MB_TYPE_L0 | MB_TYPE_L1)
852 #define MB_TYPE_QUANT 0x00010000
853 #define MB_TYPE_CBP 0x00020000
854 //Note bits 24-31 are reserved for codec specific use (h264 ref0, mpeg1 0mv, ...)
858 * This specifies the area which should be displayed.
859 * Note there may be multiple such areas for one frame.
861 typedef struct AVPanScan{
864 * - encoding: Set by user.
865 * - decoding: Set by libavcodec.
870 * width and height in 1/16 pel
871 * - encoding: Set by user.
872 * - decoding: Set by libavcodec.
878 * position of the top left corner in 1/16 pel for up to 3 fields/frames
879 * - encoding: Set by user.
880 * - decoding: Set by libavcodec.
882 int16_t position[3][2];
885 #define FF_QSCALE_TYPE_MPEG1 0
886 #define FF_QSCALE_TYPE_MPEG2 1
887 #define FF_QSCALE_TYPE_H264 2
888 #define FF_QSCALE_TYPE_VP56 3
890 #if FF_API_GET_BUFFER
891 #define FF_BUFFER_TYPE_INTERNAL 1
892 #define FF_BUFFER_TYPE_USER 2 ///< direct rendering buffers (image is (de)allocated by user)
893 #define FF_BUFFER_TYPE_SHARED 4 ///< Buffer from somewhere else; don't deallocate image (data/base), all other tables are not shared.
894 #define FF_BUFFER_TYPE_COPY 8 ///< Just a (modified) copy of some other buffer, don't deallocate anything.
896 #define FF_BUFFER_HINTS_VALID 0x01 // Buffer hints value is meaningful (if 0 ignore).
897 #define FF_BUFFER_HINTS_READABLE 0x02 // Codec will read from buffer.
898 #define FF_BUFFER_HINTS_PRESERVE 0x04 // User must not alter buffer content.
899 #define FF_BUFFER_HINTS_REUSABLE 0x08 // Codec will reuse the buffer (update).
903 * The decoder will keep a reference to the frame and may reuse it later.
905 #define AV_GET_BUFFER_FLAG_REF (1 << 0)
908 * @defgroup lavc_packet AVPacket
910 * Types and functions for working with AVPacket.
913 enum AVPacketSideDataType {
915 AV_PKT_DATA_NEW_EXTRADATA,
918 * An AV_PKT_DATA_PARAM_CHANGE side data packet is laid out as follows:
921 * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_COUNT)
922 * s32le channel_count
923 * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_LAYOUT)
924 * u64le channel_layout
925 * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_SAMPLE_RATE)
927 * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_DIMENSIONS)
932 AV_PKT_DATA_PARAM_CHANGE,
935 * An AV_PKT_DATA_H263_MB_INFO side data packet contains a number of
936 * structures with info about macroblocks relevant to splitting the
937 * packet into smaller packets on macroblock edges (e.g. as for RFC 2190).
938 * That is, it does not necessarily contain info about all macroblocks,
939 * as long as the distance between macroblocks in the info is smaller
940 * than the target payload size.
941 * Each MB info structure is 12 bytes, and is laid out as follows:
943 * u32le bit offset from the start of the packet
944 * u8 current quantizer at the start of the macroblock
946 * u16le macroblock address within the GOB
947 * u8 horizontal MV predictor
948 * u8 vertical MV predictor
949 * u8 horizontal MV predictor for block number 3
950 * u8 vertical MV predictor for block number 3
953 AV_PKT_DATA_H263_MB_INFO,
956 * Recommmends skipping the specified number of samples
958 * u32le number of samples to skip from start of this packet
959 * u32le number of samples to skip from end of this packet
960 * u8 reason for start skip
961 * u8 reason for end skip (0=padding silence, 1=convergence)
964 AV_PKT_DATA_SKIP_SAMPLES=70,
967 * An AV_PKT_DATA_JP_DUALMONO side data packet indicates that
968 * the packet may contain "dual mono" audio specific to Japanese DTV
969 * and if it is true, recommends only the selected channel to be used.
971 * u8 selected channels (0=mail/left, 1=sub/right, 2=both)
974 AV_PKT_DATA_JP_DUALMONO,
977 * A list of zero terminated key/value strings. There is no end marker for
978 * the list, so it is required to rely on the side data size to stop.
980 AV_PKT_DATA_STRINGS_METADATA,
983 * Subtitle event position
991 AV_PKT_DATA_SUBTITLE_POSITION,
994 * Data found in BlockAdditional element of matroska container. There is
995 * no end marker for the data, so it is required to rely on the side data
996 * size to recognize the end. 8 byte id (as found in BlockAddId) followed
999 AV_PKT_DATA_MATROSKA_BLOCKADDITIONAL,
1002 * The optional first identifier line of a WebVTT cue.
1004 AV_PKT_DATA_WEBVTT_IDENTIFIER,
1007 * The optional settings (rendering instructions) that immediately
1008 * follow the timestamp specifier of a WebVTT cue.
1010 AV_PKT_DATA_WEBVTT_SETTINGS,
1014 * This structure stores compressed data. It is typically exported by demuxers
1015 * and then passed as input to decoders, or received as output from encoders and
1016 * then passed to muxers.
1018 * For video, it should typically contain one compressed frame. For audio it may
1019 * contain several compressed frames.
1021 * AVPacket is one of the few structs in FFmpeg, whose size is a part of public
1022 * ABI. Thus it may be allocated on stack and no new fields can be added to it
1023 * without libavcodec and libavformat major bump.
1025 * The semantics of data ownership depends on the buf or destruct (deprecated)
1026 * fields. If either is set, the packet data is dynamically allocated and is
1027 * valid indefinitely until av_free_packet() is called (which in turn calls
1028 * av_buffer_unref()/the destruct callback to free the data). If neither is set,
1029 * the packet data is typically backed by some static buffer somewhere and is
1030 * only valid for a limited time (e.g. until the next read call when demuxing).
1032 * The side data is always allocated with av_malloc() and is freed in
1035 typedef struct AVPacket {
1037 * A reference to the reference-counted buffer where the packet data is
1039 * May be NULL, then the packet data is not reference-counted.
1043 * Presentation timestamp in AVStream->time_base units; the time at which
1044 * the decompressed packet will be presented to the user.
1045 * Can be AV_NOPTS_VALUE if it is not stored in the file.
1046 * pts MUST be larger or equal to dts as presentation cannot happen before
1047 * decompression, unless one wants to view hex dumps. Some formats misuse
1048 * the terms dts and pts/cts to mean something different. Such timestamps
1049 * must be converted to true pts/dts before they are stored in AVPacket.
1053 * Decompression timestamp in AVStream->time_base units; the time at which
1054 * the packet is decompressed.
1055 * Can be AV_NOPTS_VALUE if it is not stored in the file.
1062 * A combination of AV_PKT_FLAG values
1066 * Additional packet data that can be provided by the container.
1067 * Packet can contain several types of side information.
1072 enum AVPacketSideDataType type;
1074 int side_data_elems;
1077 * Duration of this packet in AVStream->time_base units, 0 if unknown.
1078 * Equals next_pts - this_pts in presentation order.
1081 #if FF_API_DESTRUCT_PACKET
1082 attribute_deprecated
1083 void (*destruct)(struct AVPacket *);
1084 attribute_deprecated
1087 int64_t pos; ///< byte position in stream, -1 if unknown
1090 * Time difference in AVStream->time_base units from the pts of this
1091 * packet to the point at which the output from the decoder has converged
1092 * independent from the availability of previous frames. That is, the
1093 * frames are virtually identical no matter if decoding started from
1094 * the very first frame or from this keyframe.
1095 * Is AV_NOPTS_VALUE if unknown.
1096 * This field is not the display duration of the current packet.
1097 * This field has no meaning if the packet does not have AV_PKT_FLAG_KEY
1100 * The purpose of this field is to allow seeking in streams that have no
1101 * keyframes in the conventional sense. It corresponds to the
1102 * recovery point SEI in H.264 and match_time_delta in NUT. It is also
1103 * essential for some types of subtitle streams to ensure that all
1104 * subtitles are correctly displayed after seeking.
1106 int64_t convergence_duration;
1108 #define AV_PKT_FLAG_KEY 0x0001 ///< The packet contains a keyframe
1109 #define AV_PKT_FLAG_CORRUPT 0x0002 ///< The packet content is corrupted
1111 enum AVSideDataParamChangeFlags {
1112 AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_COUNT = 0x0001,
1113 AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_LAYOUT = 0x0002,
1114 AV_SIDE_DATA_PARAM_CHANGE_SAMPLE_RATE = 0x0004,
1115 AV_SIDE_DATA_PARAM_CHANGE_DIMENSIONS = 0x0008,
1121 struct AVCodecInternal;
1125 AV_FIELD_PROGRESSIVE,
1126 AV_FIELD_TT, //< Top coded_first, top displayed first
1127 AV_FIELD_BB, //< Bottom coded first, bottom displayed first
1128 AV_FIELD_TB, //< Top coded first, bottom displayed first
1129 AV_FIELD_BT, //< Bottom coded first, top displayed first
1133 * main external API structure.
1134 * New fields can be added to the end with minor version bumps.
1135 * Removal, reordering and changes to existing fields require a major
1137 * Please use AVOptions (av_opt* / av_set/get*()) to access these fields from user
1139 * sizeof(AVCodecContext) must not be used outside libav*.
1141 typedef struct AVCodecContext {
1143 * information on struct for av_log
1144 * - set by avcodec_alloc_context3
1146 const AVClass *av_class;
1147 int log_level_offset;
1149 enum AVMediaType codec_type; /* see AVMEDIA_TYPE_xxx */
1150 const struct AVCodec *codec;
1151 char codec_name[32];
1152 enum AVCodecID codec_id; /* see AV_CODEC_ID_xxx */
1155 * fourcc (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A').
1156 * This is used to work around some encoder bugs.
1157 * A demuxer should set this to what is stored in the field used to identify the codec.
1158 * If there are multiple such fields in a container then the demuxer should choose the one
1159 * which maximizes the information about the used codec.
1160 * If the codec tag field in a container is larger than 32 bits then the demuxer should
1161 * remap the longer ID to 32 bits with a table or other structure. Alternatively a new
1162 * extra_codec_tag + size could be added but for this a clear advantage must be demonstrated
1164 * - encoding: Set by user, if not then the default based on codec_id will be used.
1165 * - decoding: Set by user, will be converted to uppercase by libavcodec during init.
1167 unsigned int codec_tag;
1170 * fourcc from the AVI stream header (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A').
1171 * This is used to work around some encoder bugs.
1172 * - encoding: unused
1173 * - decoding: Set by user, will be converted to uppercase by libavcodec during init.
1175 unsigned int stream_codec_tag;
1180 * Private context used for internal data.
1182 * Unlike priv_data, this is not codec-specific. It is used in general
1183 * libavcodec functions.
1185 struct AVCodecInternal *internal;
1188 * Private data of the user, can be used to carry app specific stuff.
1189 * - encoding: Set by user.
1190 * - decoding: Set by user.
1195 * the average bitrate
1196 * - encoding: Set by user; unused for constant quantizer encoding.
1197 * - decoding: Set by libavcodec. 0 or some bitrate if this info is available in the stream.
1202 * number of bits the bitstream is allowed to diverge from the reference.
1203 * the reference can be CBR (for CBR pass1) or VBR (for pass2)
1204 * - encoding: Set by user; unused for constant quantizer encoding.
1205 * - decoding: unused
1207 int bit_rate_tolerance;
1210 * Global quality for codecs which cannot change it per frame.
1211 * This should be proportional to MPEG-1/2/4 qscale.
1212 * - encoding: Set by user.
1213 * - decoding: unused
1218 * - encoding: Set by user.
1219 * - decoding: unused
1221 int compression_level;
1222 #define FF_COMPRESSION_DEFAULT -1
1226 * - encoding: Set by user.
1227 * - decoding: Set by user.
1233 * - encoding: Set by user.
1234 * - decoding: Set by user.
1239 * some codecs need / can use extradata like Huffman tables.
1240 * mjpeg: Huffman tables
1241 * rv10: additional flags
1242 * mpeg4: global headers (they can be in the bitstream or here)
1243 * The allocated memory should be FF_INPUT_BUFFER_PADDING_SIZE bytes larger
1244 * than extradata_size to avoid problems if it is read with the bitstream reader.
1245 * The bytewise contents of extradata must not depend on the architecture or CPU endianness.
1246 * - encoding: Set/allocated/freed by libavcodec.
1247 * - decoding: Set/allocated/freed by user.
1253 * This is the fundamental unit of time (in seconds) in terms
1254 * of which frame timestamps are represented. For fixed-fps content,
1255 * timebase should be 1/framerate and timestamp increments should be
1257 * - encoding: MUST be set by user.
1258 * - decoding: Set by libavcodec.
1260 AVRational time_base;
1263 * For some codecs, the time base is closer to the field rate than the frame rate.
1264 * Most notably, H.264 and MPEG-2 specify time_base as half of frame duration
1265 * if no telecine is used ...
1267 * Set to time_base ticks per frame. Default 1, e.g., H.264/MPEG-2 set it to 2.
1269 int ticks_per_frame;
1274 * Encoding: Number of frames delay there will be from the encoder input to
1275 * the decoder output. (we assume the decoder matches the spec)
1276 * Decoding: Number of frames delay in addition to what a standard decoder
1277 * as specified in the spec would produce.
1280 * Number of frames the decoded output will be delayed relative to the
1284 * For encoding, this is the number of "priming" samples added to the
1285 * beginning of the stream. The decoded output will be delayed by this
1286 * many samples relative to the input to the encoder. Note that this
1287 * field is purely informational and does not directly affect the pts
1288 * output by the encoder, which should always be based on the actual
1289 * presentation time, including any delay.
1290 * For decoding, this is the number of samples the decoder needs to
1291 * output before the decoder's output is valid. When seeking, you should
1292 * start decoding this many samples prior to your desired seek point.
1294 * - encoding: Set by libavcodec.
1295 * - decoding: Set by libavcodec.
1302 * picture width / height.
1303 * - encoding: MUST be set by user.
1304 * - decoding: May be set by the user before opening the decoder if known e.g.
1305 * from the container. Some decoders will require the dimensions
1306 * to be set by the caller. During decoding, the decoder may
1307 * overwrite those values as required.
1312 * Bitstream width / height, may be different from width/height e.g. when
1313 * the decoded frame is cropped before being output or lowres is enabled.
1314 * - encoding: unused
1315 * - decoding: May be set by the user before opening the decoder if known
1316 * e.g. from the container. During decoding, the decoder may
1317 * overwrite those values as required.
1319 int coded_width, coded_height;
1321 #define FF_ASPECT_EXTENDED 15
1324 * the number of pictures in a group of pictures, or 0 for intra_only
1325 * - encoding: Set by user.
1326 * - decoding: unused
1331 * Pixel format, see AV_PIX_FMT_xxx.
1332 * May be set by the demuxer if known from headers.
1333 * May be overridden by the decoder if it knows better.
1334 * - encoding: Set by user.
1335 * - decoding: Set by user if known, overridden by libavcodec if known
1337 enum AVPixelFormat pix_fmt;
1340 * Motion estimation algorithm used for video coding.
1341 * 1 (zero), 2 (full), 3 (log), 4 (phods), 5 (epzs), 6 (x1), 7 (hex),
1342 * 8 (umh), 9 (iter), 10 (tesa) [7, 8, 10 are x264 specific, 9 is snow specific]
1343 * - encoding: MUST be set by user.
1344 * - decoding: unused
1349 * If non NULL, 'draw_horiz_band' is called by the libavcodec
1350 * decoder to draw a horizontal band. It improves cache usage. Not
1351 * all codecs can do that. You must check the codec capabilities
1353 * When multithreading is used, it may be called from multiple threads
1354 * at the same time; threads might draw different parts of the same AVFrame,
1355 * or multiple AVFrames, and there is no guarantee that slices will be drawn
1357 * The function is also used by hardware acceleration APIs.
1358 * It is called at least once during frame decoding to pass
1359 * the data needed for hardware render.
1360 * In that mode instead of pixel data, AVFrame points to
1361 * a structure specific to the acceleration API. The application
1362 * reads the structure and can change some fields to indicate progress
1364 * - encoding: unused
1365 * - decoding: Set by user.
1366 * @param height the height of the slice
1367 * @param y the y position of the slice
1368 * @param type 1->top field, 2->bottom field, 3->frame
1369 * @param offset offset into the AVFrame.data from which the slice should be read
1371 void (*draw_horiz_band)(struct AVCodecContext *s,
1372 const AVFrame *src, int offset[AV_NUM_DATA_POINTERS],
1373 int y, int type, int height);
1376 * callback to negotiate the pixelFormat
1377 * @param fmt is the list of formats which are supported by the codec,
1378 * it is terminated by -1 as 0 is a valid format, the formats are ordered by quality.
1379 * The first is always the native one.
1380 * @return the chosen format
1381 * - encoding: unused
1382 * - decoding: Set by user, if not set the native format will be chosen.
1384 enum AVPixelFormat (*get_format)(struct AVCodecContext *s, const enum AVPixelFormat * fmt);
1387 * maximum number of B-frames between non-B-frames
1388 * Note: The output will be delayed by max_b_frames+1 relative to the input.
1389 * - encoding: Set by user.
1390 * - decoding: unused
1395 * qscale factor between IP and B-frames
1396 * If > 0 then the last P-frame quantizer will be used (q= lastp_q*factor+offset).
1397 * If < 0 then normal ratecontrol will be done (q= -normal_q*factor+offset).
1398 * - encoding: Set by user.
1399 * - decoding: unused
1401 float b_quant_factor;
1403 /** obsolete FIXME remove */
1405 #define FF_RC_STRATEGY_XVID 1
1407 int b_frame_strategy;
1410 * qscale offset between IP and B-frames
1411 * - encoding: Set by user.
1412 * - decoding: unused
1414 float b_quant_offset;
1417 * Size of the frame reordering buffer in the decoder.
1418 * For MPEG-2 it is 1 IPB or 0 low delay IP.
1419 * - encoding: Set by libavcodec.
1420 * - decoding: Set by libavcodec.
1425 * 0-> h263 quant 1-> mpeg quant
1426 * - encoding: Set by user.
1427 * - decoding: unused
1432 * qscale factor between P and I-frames
1433 * If > 0 then the last p frame quantizer will be used (q= lastp_q*factor+offset).
1434 * If < 0 then normal ratecontrol will be done (q= -normal_q*factor+offset).
1435 * - encoding: Set by user.
1436 * - decoding: unused
1438 float i_quant_factor;
1441 * qscale offset between P and I-frames
1442 * - encoding: Set by user.
1443 * - decoding: unused
1445 float i_quant_offset;
1448 * luminance masking (0-> disabled)
1449 * - encoding: Set by user.
1450 * - decoding: unused
1455 * temporary complexity masking (0-> disabled)
1456 * - encoding: Set by user.
1457 * - decoding: unused
1459 float temporal_cplx_masking;
1462 * spatial complexity masking (0-> disabled)
1463 * - encoding: Set by user.
1464 * - decoding: unused
1466 float spatial_cplx_masking;
1469 * p block masking (0-> disabled)
1470 * - encoding: Set by user.
1471 * - decoding: unused
1476 * darkness masking (0-> disabled)
1477 * - encoding: Set by user.
1478 * - decoding: unused
1484 * - encoding: Set by libavcodec.
1485 * - decoding: Set by user (or 0).
1489 * prediction method (needed for huffyuv)
1490 * - encoding: Set by user.
1491 * - decoding: unused
1493 int prediction_method;
1494 #define FF_PRED_LEFT 0
1495 #define FF_PRED_PLANE 1
1496 #define FF_PRED_MEDIAN 2
1499 * slice offsets in the frame in bytes
1500 * - encoding: Set/allocated by libavcodec.
1501 * - decoding: Set/allocated by user (or NULL).
1506 * sample aspect ratio (0 if unknown)
1507 * That is the width of a pixel divided by the height of the pixel.
1508 * Numerator and denominator must be relatively prime and smaller than 256 for some video standards.
1509 * - encoding: Set by user.
1510 * - decoding: Set by libavcodec.
1512 AVRational sample_aspect_ratio;
1515 * motion estimation comparison function
1516 * - encoding: Set by user.
1517 * - decoding: unused
1521 * subpixel motion estimation comparison function
1522 * - encoding: Set by user.
1523 * - decoding: unused
1527 * macroblock comparison function (not supported yet)
1528 * - encoding: Set by user.
1529 * - decoding: unused
1533 * interlaced DCT comparison function
1534 * - encoding: Set by user.
1535 * - decoding: unused
1538 #define FF_CMP_SAD 0
1539 #define FF_CMP_SSE 1
1540 #define FF_CMP_SATD 2
1541 #define FF_CMP_DCT 3
1542 #define FF_CMP_PSNR 4
1543 #define FF_CMP_BIT 5
1545 #define FF_CMP_ZERO 7
1546 #define FF_CMP_VSAD 8
1547 #define FF_CMP_VSSE 9
1548 #define FF_CMP_NSSE 10
1549 #define FF_CMP_W53 11
1550 #define FF_CMP_W97 12
1551 #define FF_CMP_DCTMAX 13
1552 #define FF_CMP_DCT264 14
1553 #define FF_CMP_CHROMA 256
1556 * ME diamond size & shape
1557 * - encoding: Set by user.
1558 * - decoding: unused
1563 * amount of previous MV predictors (2a+1 x 2a+1 square)
1564 * - encoding: Set by user.
1565 * - decoding: unused
1567 int last_predictor_count;
1570 * prepass for motion estimation
1571 * - encoding: Set by user.
1572 * - decoding: unused
1577 * motion estimation prepass comparison function
1578 * - encoding: Set by user.
1579 * - decoding: unused
1584 * ME prepass diamond size & shape
1585 * - encoding: Set by user.
1586 * - decoding: unused
1592 * - encoding: Set by user.
1593 * - decoding: unused
1595 int me_subpel_quality;
1598 * DTG active format information (additional aspect ratio
1599 * information only used in DVB MPEG-2 transport streams)
1602 * - encoding: unused
1603 * - decoding: Set by decoder.
1605 int dtg_active_format;
1606 #define FF_DTG_AFD_SAME 8
1607 #define FF_DTG_AFD_4_3 9
1608 #define FF_DTG_AFD_16_9 10
1609 #define FF_DTG_AFD_14_9 11
1610 #define FF_DTG_AFD_4_3_SP_14_9 13
1611 #define FF_DTG_AFD_16_9_SP_14_9 14
1612 #define FF_DTG_AFD_SP_4_3 15
1615 * maximum motion estimation search range in subpel units
1616 * If 0 then no limit.
1618 * - encoding: Set by user.
1619 * - decoding: unused
1624 * intra quantizer bias
1625 * - encoding: Set by user.
1626 * - decoding: unused
1628 int intra_quant_bias;
1629 #define FF_DEFAULT_QUANT_BIAS 999999
1632 * inter quantizer bias
1633 * - encoding: Set by user.
1634 * - decoding: unused
1636 int inter_quant_bias;
1640 * - encoding: unused
1641 * - decoding: Set by user.
1644 #define SLICE_FLAG_CODED_ORDER 0x0001 ///< draw_horiz_band() is called in coded order instead of display
1645 #define SLICE_FLAG_ALLOW_FIELD 0x0002 ///< allow draw_horiz_band() with field slices (MPEG2 field pics)
1646 #define SLICE_FLAG_ALLOW_PLANE 0x0004 ///< allow draw_horiz_band() with 1 component at a time (SVQ1)
1649 * XVideo Motion Acceleration
1650 * - encoding: forbidden
1651 * - decoding: set by decoder
1653 int xvmc_acceleration;
1656 * macroblock decision mode
1657 * - encoding: Set by user.
1658 * - decoding: unused
1661 #define FF_MB_DECISION_SIMPLE 0 ///< uses mb_cmp
1662 #define FF_MB_DECISION_BITS 1 ///< chooses the one which needs the fewest bits
1663 #define FF_MB_DECISION_RD 2 ///< rate distortion
1666 * custom intra quantization matrix
1667 * - encoding: Set by user, can be NULL.
1668 * - decoding: Set by libavcodec.
1670 uint16_t *intra_matrix;
1673 * custom inter quantization matrix
1674 * - encoding: Set by user, can be NULL.
1675 * - decoding: Set by libavcodec.
1677 uint16_t *inter_matrix;
1680 * scene change detection threshold
1681 * 0 is default, larger means fewer detected scene changes.
1682 * - encoding: Set by user.
1683 * - decoding: unused
1685 int scenechange_threshold;
1688 * noise reduction strength
1689 * - encoding: Set by user.
1690 * - decoding: unused
1692 int noise_reduction;
1695 * Motion estimation threshold below which no motion estimation is
1696 * performed, but instead the user specified motion vectors are used.
1698 * - encoding: Set by user.
1699 * - decoding: unused
1704 * Macroblock threshold below which the user specified macroblock types will be used.
1705 * - encoding: Set by user.
1706 * - decoding: unused
1711 * precision of the intra DC coefficient - 8
1712 * - encoding: Set by user.
1713 * - decoding: unused
1715 int intra_dc_precision;
1718 * Number of macroblock rows at the top which are skipped.
1719 * - encoding: unused
1720 * - decoding: Set by user.
1725 * Number of macroblock rows at the bottom which are skipped.
1726 * - encoding: unused
1727 * - decoding: Set by user.
1732 * Border processing masking, raises the quantizer for mbs on the borders
1734 * - encoding: Set by user.
1735 * - decoding: unused
1737 float border_masking;
1740 * minimum MB lagrange multipler
1741 * - encoding: Set by user.
1742 * - decoding: unused
1747 * maximum MB lagrange multipler
1748 * - encoding: Set by user.
1749 * - decoding: unused
1755 * - encoding: Set by user.
1756 * - decoding: unused
1758 int me_penalty_compensation;
1762 * - encoding: Set by user.
1763 * - decoding: unused
1769 * - encoding: Set by user.
1770 * - decoding: unused
1776 * - encoding: Set by user.
1777 * - decoding: unused
1782 * number of reference frames
1783 * - encoding: Set by user.
1784 * - decoding: Set by lavc.
1789 * chroma qp offset from luma
1790 * - encoding: Set by user.
1791 * - decoding: unused
1796 * Multiplied by qscale for each frame and added to scene_change_score.
1797 * - encoding: Set by user.
1798 * - decoding: unused
1800 int scenechange_factor;
1804 * Note: Value depends upon the compare function used for fullpel ME.
1805 * - encoding: Set by user.
1806 * - decoding: unused
1811 * Adjust sensitivity of b_frame_strategy 1.
1812 * - encoding: Set by user.
1813 * - decoding: unused
1818 * Chromaticity coordinates of the source primaries.
1819 * - encoding: Set by user
1820 * - decoding: Set by libavcodec
1822 enum AVColorPrimaries color_primaries;
1825 * Color Transfer Characteristic.
1826 * - encoding: Set by user
1827 * - decoding: Set by libavcodec
1829 enum AVColorTransferCharacteristic color_trc;
1832 * YUV colorspace type.
1833 * - encoding: Set by user
1834 * - decoding: Set by libavcodec
1836 enum AVColorSpace colorspace;
1839 * MPEG vs JPEG YUV range.
1840 * - encoding: Set by user
1841 * - decoding: Set by libavcodec
1843 enum AVColorRange color_range;
1846 * This defines the location of chroma samples.
1847 * - encoding: Set by user
1848 * - decoding: Set by libavcodec
1850 enum AVChromaLocation chroma_sample_location;
1854 * Indicates number of picture subdivisions. Used for parallelized
1856 * - encoding: Set by user
1857 * - decoding: unused
1862 * - encoding: set by libavcodec
1863 * - decoding: Set by user.
1865 enum AVFieldOrder field_order;
1868 int sample_rate; ///< samples per second
1869 int channels; ///< number of audio channels
1872 * audio sample format
1873 * - encoding: Set by user.
1874 * - decoding: Set by libavcodec.
1876 enum AVSampleFormat sample_fmt; ///< sample format
1878 /* The following data should not be initialized. */
1880 * Number of samples per channel in an audio frame.
1882 * - encoding: set by libavcodec in avcodec_open2(). Each submitted frame
1883 * except the last must contain exactly frame_size samples per channel.
1884 * May be 0 when the codec has CODEC_CAP_VARIABLE_FRAME_SIZE set, then the
1885 * frame size is not restricted.
1886 * - decoding: may be set by some decoders to indicate constant frame size
1891 * Frame counter, set by libavcodec.
1893 * - decoding: total number of frames returned from the decoder so far.
1894 * - encoding: total number of frames passed to the encoder so far.
1896 * @note the counter is not incremented if encoding/decoding resulted in
1902 * number of bytes per packet if constant and known or 0
1903 * Used by some WAV based audio codecs.
1908 * Audio cutoff bandwidth (0 means "automatic")
1909 * - encoding: Set by user.
1910 * - decoding: unused
1914 #if FF_API_REQUEST_CHANNELS
1916 * Decoder should decode to this many channels if it can (0 for default)
1917 * - encoding: unused
1918 * - decoding: Set by user.
1919 * @deprecated Deprecated in favor of request_channel_layout.
1921 attribute_deprecated int request_channels;
1925 * Audio channel layout.
1926 * - encoding: set by user.
1927 * - decoding: set by user, may be overwritten by libavcodec.
1929 uint64_t channel_layout;
1932 * Request decoder to use this channel layout if it can (0 for default)
1933 * - encoding: unused
1934 * - decoding: Set by user.
1936 uint64_t request_channel_layout;
1939 * Type of service that the audio stream conveys.
1940 * - encoding: Set by user.
1941 * - decoding: Set by libavcodec.
1943 enum AVAudioServiceType audio_service_type;
1946 * desired sample format
1947 * - encoding: Not used.
1948 * - decoding: Set by user.
1949 * Decoder will decode to this format if it can.
1951 enum AVSampleFormat request_sample_fmt;
1953 #if FF_API_GET_BUFFER
1955 * Called at the beginning of each frame to get a buffer for it.
1957 * The function will set AVFrame.data[], AVFrame.linesize[].
1958 * AVFrame.extended_data[] must also be set, but it should be the same as
1959 * AVFrame.data[] except for planar audio with more channels than can fit
1960 * in AVFrame.data[]. In that case, AVFrame.data[] shall still contain as
1961 * many data pointers as it can hold.
1963 * if CODEC_CAP_DR1 is not set then get_buffer() must call
1964 * avcodec_default_get_buffer() instead of providing buffers allocated by
1967 * AVFrame.data[] should be 32- or 16-byte-aligned unless the CPU doesn't
1968 * need it. avcodec_default_get_buffer() aligns the output buffer properly,
1969 * but if get_buffer() is overridden then alignment considerations should
1970 * be taken into account.
1972 * @see avcodec_default_get_buffer()
1976 * If pic.reference is set then the frame will be read later by libavcodec.
1977 * avcodec_align_dimensions2() should be used to find the required width and
1978 * height, as they normally need to be rounded up to the next multiple of 16.
1980 * If frame multithreading is used and thread_safe_callbacks is set,
1981 * it may be called from a different thread, but not from more than one at
1982 * once. Does not need to be reentrant.
1984 * @see release_buffer(), reget_buffer()
1985 * @see avcodec_align_dimensions2()
1989 * Decoders request a buffer of a particular size by setting
1990 * AVFrame.nb_samples prior to calling get_buffer(). The decoder may,
1991 * however, utilize only part of the buffer by setting AVFrame.nb_samples
1992 * to a smaller value in the output frame.
1994 * Decoders cannot use the buffer after returning from
1995 * avcodec_decode_audio4(), so they will not call release_buffer(), as it
1996 * is assumed to be released immediately upon return. In some rare cases,
1997 * a decoder may need to call get_buffer() more than once in a single
1998 * call to avcodec_decode_audio4(). In that case, when get_buffer() is
1999 * called again after it has already been called once, the previously
2000 * acquired buffer is assumed to be released at that time and may not be
2001 * reused by the decoder.
2003 * As a convenience, av_samples_get_buffer_size() and
2004 * av_samples_fill_arrays() in libavutil may be used by custom get_buffer()
2005 * functions to find the required data size and to fill data pointers and
2006 * linesize. In AVFrame.linesize, only linesize[0] may be set for audio
2007 * since all planes must be the same size.
2009 * @see av_samples_get_buffer_size(), av_samples_fill_arrays()
2011 * - encoding: unused
2012 * - decoding: Set by libavcodec, user can override.
2014 * @deprecated use get_buffer2()
2016 attribute_deprecated
2017 int (*get_buffer)(struct AVCodecContext *c, AVFrame *pic);
2020 * Called to release buffers which were allocated with get_buffer.
2021 * A released buffer can be reused in get_buffer().
2022 * pic.data[*] must be set to NULL.
2023 * May be called from a different thread if frame multithreading is used,
2024 * but not by more than one thread at once, so does not need to be reentrant.
2025 * - encoding: unused
2026 * - decoding: Set by libavcodec, user can override.
2028 * @deprecated custom freeing callbacks should be set from get_buffer2()
2030 attribute_deprecated
2031 void (*release_buffer)(struct AVCodecContext *c, AVFrame *pic);
2034 * Called at the beginning of a frame to get cr buffer for it.
2035 * Buffer type (size, hints) must be the same. libavcodec won't check it.
2036 * libavcodec will pass previous buffer in pic, function should return
2037 * same buffer or new buffer with old frame "painted" into it.
2038 * If pic.data[0] == NULL must behave like get_buffer().
2039 * if CODEC_CAP_DR1 is not set then reget_buffer() must call
2040 * avcodec_default_reget_buffer() instead of providing buffers allocated by
2042 * - encoding: unused
2043 * - decoding: Set by libavcodec, user can override.
2045 attribute_deprecated
2046 int (*reget_buffer)(struct AVCodecContext *c, AVFrame *pic);
2050 * This callback is called at the beginning of each frame to get data
2051 * buffer(s) for it. There may be one contiguous buffer for all the data or
2052 * there may be a buffer per each data plane or anything in between. What
2053 * this means is, you may set however many entries in buf[] you feel necessary.
2054 * Each buffer must be reference-counted using the AVBuffer API (see description
2057 * The following fields will be set in the frame before this callback is
2060 * - width, height (video only)
2061 * - sample_rate, channel_layout, nb_samples (audio only)
2062 * Their values may differ from the corresponding values in
2063 * AVCodecContext. This callback must use the frame values, not the codec
2064 * context values, to calculate the required buffer size.
2066 * This callback must fill the following fields in the frame:
2070 * * if the data is planar audio with more than 8 channels, then this
2071 * callback must allocate and fill extended_data to contain all pointers
2072 * to all data planes. data[] must hold as many pointers as it can.
2073 * extended_data must be allocated with av_malloc() and will be freed in
2075 * * otherwise exended_data must point to data
2076 * - buf[] must contain one or more pointers to AVBufferRef structures. Each of
2077 * the frame's data and extended_data pointers must be contained in these. That
2078 * is, one AVBufferRef for each allocated chunk of memory, not necessarily one
2079 * AVBufferRef per data[] entry. See: av_buffer_create(), av_buffer_alloc(),
2080 * and av_buffer_ref().
2081 * - extended_buf and nb_extended_buf must be allocated with av_malloc() by
2082 * this callback and filled with the extra buffers if there are more
2083 * buffers than buf[] can hold. extended_buf will be freed in
2086 * If CODEC_CAP_DR1 is not set then get_buffer2() must call
2087 * avcodec_default_get_buffer2() instead of providing buffers allocated by
2090 * Each data plane must be aligned to the maximum required by the target
2093 * @see avcodec_default_get_buffer2()
2097 * If AV_GET_BUFFER_FLAG_REF is set in flags then the frame may be reused
2098 * (read and/or written to if it is writable) later by libavcodec.
2100 * If CODEC_FLAG_EMU_EDGE is not set in s->flags, the buffer must contain an
2101 * edge of the size returned by avcodec_get_edge_width() on all sides.
2103 * avcodec_align_dimensions2() should be used to find the required width and
2104 * height, as they normally need to be rounded up to the next multiple of 16.
2106 * If frame multithreading is used and thread_safe_callbacks is set,
2107 * this callback may be called from a different thread, but not from more
2108 * than one at once. Does not need to be reentrant.
2110 * @see avcodec_align_dimensions2()
2114 * Decoders request a buffer of a particular size by setting
2115 * AVFrame.nb_samples prior to calling get_buffer2(). The decoder may,
2116 * however, utilize only part of the buffer by setting AVFrame.nb_samples
2117 * to a smaller value in the output frame.
2119 * As a convenience, av_samples_get_buffer_size() and
2120 * av_samples_fill_arrays() in libavutil may be used by custom get_buffer2()
2121 * functions to find the required data size and to fill data pointers and
2122 * linesize. In AVFrame.linesize, only linesize[0] may be set for audio
2123 * since all planes must be the same size.
2125 * @see av_samples_get_buffer_size(), av_samples_fill_arrays()
2127 * - encoding: unused
2128 * - decoding: Set by libavcodec, user can override.
2130 int (*get_buffer2)(struct AVCodecContext *s, AVFrame *frame, int flags);
2133 * If non-zero, the decoded audio and video frames returned from
2134 * avcodec_decode_video2() and avcodec_decode_audio4() are reference-counted
2135 * and are valid indefinitely. The caller must free them with
2136 * av_frame_unref() when they are not needed anymore.
2137 * Otherwise, the decoded frames must not be freed by the caller and are
2138 * only valid until the next decode call.
2140 * - encoding: unused
2141 * - decoding: set by the caller before avcodec_open2().
2143 int refcounted_frames;
2145 /* - encoding parameters */
2146 float qcompress; ///< amount of qscale change between easy & hard scenes (0.0-1.0)
2147 float qblur; ///< amount of qscale smoothing over time (0.0-1.0)
2151 * - encoding: Set by user.
2152 * - decoding: unused
2158 * - encoding: Set by user.
2159 * - decoding: unused
2164 * maximum quantizer difference between frames
2165 * - encoding: Set by user.
2166 * - decoding: unused
2171 * ratecontrol qmin qmax limiting method
2172 * 0-> clipping, 1-> use a nice continuous function to limit qscale wthin qmin/qmax.
2173 * - encoding: Set by user.
2174 * - decoding: unused
2182 * decoder bitstream buffer size
2183 * - encoding: Set by user.
2184 * - decoding: unused
2189 * ratecontrol override, see RcOverride
2190 * - encoding: Allocated/set/freed by user.
2191 * - decoding: unused
2193 int rc_override_count;
2194 RcOverride *rc_override;
2197 * rate control equation
2198 * - encoding: Set by user
2199 * - decoding: unused
2205 * - encoding: Set by user.
2206 * - decoding: unused
2212 * - encoding: Set by user.
2213 * - decoding: unused
2217 float rc_buffer_aggressivity;
2220 * initial complexity for pass1 ratecontrol
2221 * - encoding: Set by user.
2222 * - decoding: unused
2224 float rc_initial_cplx;
2227 * Ratecontrol attempt to use, at maximum, <value> of what can be used without an underflow.
2228 * - encoding: Set by user.
2229 * - decoding: unused.
2231 float rc_max_available_vbv_use;
2234 * Ratecontrol attempt to use, at least, <value> times the amount needed to prevent a vbv overflow.
2235 * - encoding: Set by user.
2236 * - decoding: unused.
2238 float rc_min_vbv_overflow_use;
2241 * Number of bits which should be loaded into the rc buffer before decoding starts.
2242 * - encoding: Set by user.
2243 * - decoding: unused
2245 int rc_initial_buffer_occupancy;
2247 #define FF_CODER_TYPE_VLC 0
2248 #define FF_CODER_TYPE_AC 1
2249 #define FF_CODER_TYPE_RAW 2
2250 #define FF_CODER_TYPE_RLE 3
2251 #define FF_CODER_TYPE_DEFLATE 4
2254 * - encoding: Set by user.
2255 * - decoding: unused
2261 * - encoding: Set by user.
2262 * - decoding: unused
2267 * minimum Lagrange multipler
2268 * - encoding: Set by user.
2269 * - decoding: unused
2274 * maximum Lagrange multipler
2275 * - encoding: Set by user.
2276 * - decoding: unused
2281 * frame skip threshold
2282 * - encoding: Set by user.
2283 * - decoding: unused
2285 int frame_skip_threshold;
2289 * - encoding: Set by user.
2290 * - decoding: unused
2292 int frame_skip_factor;
2295 * frame skip exponent
2296 * - encoding: Set by user.
2297 * - decoding: unused
2302 * frame skip comparison function
2303 * - encoding: Set by user.
2304 * - decoding: unused
2309 * trellis RD quantization
2310 * - encoding: Set by user.
2311 * - decoding: unused
2316 * - encoding: Set by user.
2317 * - decoding: unused
2319 int min_prediction_order;
2322 * - encoding: Set by user.
2323 * - decoding: unused
2325 int max_prediction_order;
2328 * GOP timecode frame start number
2329 * - encoding: Set by user, in non drop frame format
2330 * - decoding: Set by libavcodec (timecode in the 25 bits format, -1 if unset)
2332 int64_t timecode_frame_start;
2334 /* The RTP callback: This function is called */
2335 /* every time the encoder has a packet to send. */
2336 /* It depends on the encoder if the data starts */
2337 /* with a Start Code (it should). H.263 does. */
2338 /* mb_nb contains the number of macroblocks */
2339 /* encoded in the RTP payload. */
2340 void (*rtp_callback)(struct AVCodecContext *avctx, void *data, int size, int mb_nb);
2342 int rtp_payload_size; /* The size of the RTP payload: the coder will */
2343 /* do its best to deliver a chunk with size */
2344 /* below rtp_payload_size, the chunk will start */
2345 /* with a start code on some codecs like H.263. */
2346 /* This doesn't take account of any particular */
2347 /* headers inside the transmitted RTP payload. */
2349 /* statistics, used for 2-pass encoding */
2360 * number of bits used for the previously encoded frame
2361 * - encoding: Set by libavcodec.
2362 * - decoding: unused
2367 * pass1 encoding statistics output buffer
2368 * - encoding: Set by libavcodec.
2369 * - decoding: unused
2374 * pass2 encoding statistics input buffer
2375 * Concatenated stuff from stats_out of pass1 should be placed here.
2376 * - encoding: Allocated/set/freed by user.
2377 * - decoding: unused
2382 * Work around bugs in encoders which sometimes cannot be detected automatically.
2383 * - encoding: Set by user
2384 * - decoding: Set by user
2386 int workaround_bugs;
2387 #define FF_BUG_AUTODETECT 1 ///< autodetection
2388 #define FF_BUG_OLD_MSMPEG4 2
2389 #define FF_BUG_XVID_ILACE 4
2390 #define FF_BUG_UMP4 8
2391 #define FF_BUG_NO_PADDING 16
2392 #define FF_BUG_AMV 32
2393 #define FF_BUG_AC_VLC 0 ///< Will be removed, libavcodec can now handle these non-compliant files by default.
2394 #define FF_BUG_QPEL_CHROMA 64
2395 #define FF_BUG_STD_QPEL 128
2396 #define FF_BUG_QPEL_CHROMA2 256
2397 #define FF_BUG_DIRECT_BLOCKSIZE 512
2398 #define FF_BUG_EDGE 1024
2399 #define FF_BUG_HPEL_CHROMA 2048
2400 #define FF_BUG_DC_CLIP 4096
2401 #define FF_BUG_MS 8192 ///< Work around various bugs in Microsoft's broken decoders.
2402 #define FF_BUG_TRUNCATED 16384
2405 * strictly follow the standard (MPEG4, ...).
2406 * - encoding: Set by user.
2407 * - decoding: Set by user.
2408 * Setting this to STRICT or higher means the encoder and decoder will
2409 * generally do stupid things, whereas setting it to unofficial or lower
2410 * will mean the encoder might produce output that is not supported by all
2411 * spec-compliant decoders. Decoders don't differentiate between normal,
2412 * unofficial and experimental (that is, they always try to decode things
2413 * when they can) unless they are explicitly asked to behave stupidly
2414 * (=strictly conform to the specs)
2416 int strict_std_compliance;
2417 #define FF_COMPLIANCE_VERY_STRICT 2 ///< Strictly conform to an older more strict version of the spec or reference software.
2418 #define FF_COMPLIANCE_STRICT 1 ///< Strictly conform to all the things in the spec no matter what consequences.
2419 #define FF_COMPLIANCE_NORMAL 0
2420 #define FF_COMPLIANCE_UNOFFICIAL -1 ///< Allow unofficial extensions
2421 #define FF_COMPLIANCE_EXPERIMENTAL -2 ///< Allow nonstandardized experimental things.
2424 * error concealment flags
2425 * - encoding: unused
2426 * - decoding: Set by user.
2428 int error_concealment;
2429 #define FF_EC_GUESS_MVS 1
2430 #define FF_EC_DEBLOCK 2
2434 * - encoding: Set by user.
2435 * - decoding: Set by user.
2438 #define FF_DEBUG_PICT_INFO 1
2439 #define FF_DEBUG_RC 2
2440 #define FF_DEBUG_BITSTREAM 4
2441 #define FF_DEBUG_MB_TYPE 8
2442 #define FF_DEBUG_QP 16
2443 #define FF_DEBUG_MV 32
2444 #define FF_DEBUG_DCT_COEFF 0x00000040
2445 #define FF_DEBUG_SKIP 0x00000080
2446 #define FF_DEBUG_STARTCODE 0x00000100
2447 #define FF_DEBUG_PTS 0x00000200
2448 #define FF_DEBUG_ER 0x00000400
2449 #define FF_DEBUG_MMCO 0x00000800
2450 #define FF_DEBUG_BUGS 0x00001000
2451 #define FF_DEBUG_VIS_QP 0x00002000
2452 #define FF_DEBUG_VIS_MB_TYPE 0x00004000
2453 #define FF_DEBUG_BUFFERS 0x00008000
2454 #define FF_DEBUG_THREADS 0x00010000
2458 * - encoding: Set by user.
2459 * - decoding: Set by user.
2462 #define FF_DEBUG_VIS_MV_P_FOR 0x00000001 //visualize forward predicted MVs of P frames
2463 #define FF_DEBUG_VIS_MV_B_FOR 0x00000002 //visualize forward predicted MVs of B frames
2464 #define FF_DEBUG_VIS_MV_B_BACK 0x00000004 //visualize backward predicted MVs of B frames
2467 * Error recognition; may misdetect some more or less valid parts as errors.
2468 * - encoding: unused
2469 * - decoding: Set by user.
2471 int err_recognition;
2472 #define AV_EF_CRCCHECK (1<<0)
2473 #define AV_EF_BITSTREAM (1<<1)
2474 #define AV_EF_BUFFER (1<<2)
2475 #define AV_EF_EXPLODE (1<<3)
2477 #define AV_EF_CAREFUL (1<<16)
2478 #define AV_EF_COMPLIANT (1<<17)
2479 #define AV_EF_AGGRESSIVE (1<<18)
2483 * opaque 64bit number (generally a PTS) that will be reordered and
2484 * output in AVFrame.reordered_opaque
2485 * @deprecated in favor of pkt_pts
2486 * - encoding: unused
2487 * - decoding: Set by user.
2489 int64_t reordered_opaque;
2492 * Hardware accelerator in use
2493 * - encoding: unused.
2494 * - decoding: Set by libavcodec
2496 struct AVHWAccel *hwaccel;
2499 * Hardware accelerator context.
2500 * For some hardware accelerators, a global context needs to be
2501 * provided by the user. In that case, this holds display-dependent
2502 * data FFmpeg cannot instantiate itself. Please refer to the
2503 * FFmpeg HW accelerator documentation to know how to fill this
2504 * is. e.g. for VA API, this is a struct vaapi_context.
2505 * - encoding: unused
2506 * - decoding: Set by user
2508 void *hwaccel_context;
2512 * - encoding: Set by libavcodec if flags&CODEC_FLAG_PSNR.
2513 * - decoding: unused
2515 uint64_t error[AV_NUM_DATA_POINTERS];
2518 * DCT algorithm, see FF_DCT_* below
2519 * - encoding: Set by user.
2520 * - decoding: unused
2523 #define FF_DCT_AUTO 0
2524 #define FF_DCT_FASTINT 1
2525 #define FF_DCT_INT 2
2526 #define FF_DCT_MMX 3
2527 #define FF_DCT_ALTIVEC 5
2528 #define FF_DCT_FAAN 6
2531 * IDCT algorithm, see FF_IDCT_* below.
2532 * - encoding: Set by user.
2533 * - decoding: Set by user.
2536 #define FF_IDCT_AUTO 0
2537 #define FF_IDCT_INT 1
2538 #define FF_IDCT_SIMPLE 2
2539 #define FF_IDCT_SIMPLEMMX 3
2540 #define FF_IDCT_ARM 7
2541 #define FF_IDCT_ALTIVEC 8
2542 #define FF_IDCT_SH4 9
2543 #define FF_IDCT_SIMPLEARM 10
2544 #define FF_IDCT_IPP 13
2545 #define FF_IDCT_XVIDMMX 14
2546 #define FF_IDCT_SIMPLEARMV5TE 16
2547 #define FF_IDCT_SIMPLEARMV6 17
2548 #define FF_IDCT_SIMPLEVIS 18
2549 #define FF_IDCT_FAAN 20
2550 #define FF_IDCT_SIMPLENEON 22
2551 #define FF_IDCT_SIMPLEALPHA 23
2554 * bits per sample/pixel from the demuxer (needed for huffyuv).
2555 * - encoding: Set by libavcodec.
2556 * - decoding: Set by user.
2558 int bits_per_coded_sample;
2561 * Bits per sample/pixel of internal libavcodec pixel/sample format.
2562 * - encoding: set by user.
2563 * - decoding: set by libavcodec.
2565 int bits_per_raw_sample;
2569 * low resolution decoding, 1-> 1/2 size, 2->1/4 size
2570 * - encoding: unused
2571 * - decoding: Set by user.
2572 * Code outside libavcodec should access this field using:
2573 * av_codec_{get,set}_lowres(avctx)
2579 * the picture in the bitstream
2580 * - encoding: Set by libavcodec.
2581 * - decoding: Set by libavcodec.
2583 AVFrame *coded_frame;
2587 * is used to decide how many independent tasks should be passed to execute()
2588 * - encoding: Set by user.
2589 * - decoding: Set by user.
2594 * Which multithreading methods to use.
2595 * Use of FF_THREAD_FRAME will increase decoding delay by one frame per thread,
2596 * so clients which cannot provide future frames should not use it.
2598 * - encoding: Set by user, otherwise the default is used.
2599 * - decoding: Set by user, otherwise the default is used.
2602 #define FF_THREAD_FRAME 1 ///< Decode more than one frame at once
2603 #define FF_THREAD_SLICE 2 ///< Decode more than one part of a single frame at once
2606 * Which multithreading methods are in use by the codec.
2607 * - encoding: Set by libavcodec.
2608 * - decoding: Set by libavcodec.
2610 int active_thread_type;
2613 * Set by the client if its custom get_buffer() callback can be called
2614 * synchronously from another thread, which allows faster multithreaded decoding.
2615 * draw_horiz_band() will be called from other threads regardless of this setting.
2616 * Ignored if the default get_buffer() is used.
2617 * - encoding: Set by user.
2618 * - decoding: Set by user.
2620 int thread_safe_callbacks;
2623 * The codec may call this to execute several independent things.
2624 * It will return only after finishing all tasks.
2625 * The user may replace this with some multithreaded implementation,
2626 * the default implementation will execute the parts serially.
2627 * @param count the number of things to execute
2628 * - encoding: Set by libavcodec, user can override.
2629 * - decoding: Set by libavcodec, user can override.
2631 int (*execute)(struct AVCodecContext *c, int (*func)(struct AVCodecContext *c2, void *arg), void *arg2, int *ret, int count, int size);
2634 * The codec may call this to execute several independent things.
2635 * It will return only after finishing all tasks.
2636 * The user may replace this with some multithreaded implementation,
2637 * the default implementation will execute the parts serially.
2638 * Also see avcodec_thread_init and e.g. the --enable-pthread configure option.
2639 * @param c context passed also to func
2640 * @param count the number of things to execute
2641 * @param arg2 argument passed unchanged to func
2642 * @param ret return values of executed functions, must have space for "count" values. May be NULL.
2643 * @param func function that will be called count times, with jobnr from 0 to count-1.
2644 * threadnr will be in the range 0 to c->thread_count-1 < MAX_THREADS and so that no
2645 * two instances of func executing at the same time will have the same threadnr.
2646 * @return always 0 currently, but code should handle a future improvement where when any call to func
2647 * returns < 0 no further calls to func may be done and < 0 is returned.
2648 * - encoding: Set by libavcodec, user can override.
2649 * - decoding: Set by libavcodec, user can override.
2651 int (*execute2)(struct AVCodecContext *c, int (*func)(struct AVCodecContext *c2, void *arg, int jobnr, int threadnr), void *arg2, int *ret, int count);
2655 * Can be used by execute() to store some per AVCodecContext stuff.
2656 * - encoding: set by execute()
2657 * - decoding: set by execute()
2659 void *thread_opaque;
2662 * noise vs. sse weight for the nsse comparsion function
2663 * - encoding: Set by user.
2664 * - decoding: unused
2670 * - encoding: Set by user.
2671 * - decoding: Set by libavcodec.
2674 #define FF_PROFILE_UNKNOWN -99
2675 #define FF_PROFILE_RESERVED -100
2677 #define FF_PROFILE_AAC_MAIN 0
2678 #define FF_PROFILE_AAC_LOW 1
2679 #define FF_PROFILE_AAC_SSR 2
2680 #define FF_PROFILE_AAC_LTP 3
2681 #define FF_PROFILE_AAC_HE 4
2682 #define FF_PROFILE_AAC_HE_V2 28
2683 #define FF_PROFILE_AAC_LD 22
2684 #define FF_PROFILE_AAC_ELD 38
2685 #define FF_PROFILE_MPEG2_AAC_LOW 128
2686 #define FF_PROFILE_MPEG2_AAC_HE 131
2688 #define FF_PROFILE_DTS 20
2689 #define FF_PROFILE_DTS_ES 30
2690 #define FF_PROFILE_DTS_96_24 40
2691 #define FF_PROFILE_DTS_HD_HRA 50
2692 #define FF_PROFILE_DTS_HD_MA 60
2694 #define FF_PROFILE_MPEG2_422 0
2695 #define FF_PROFILE_MPEG2_HIGH 1
2696 #define FF_PROFILE_MPEG2_SS 2
2697 #define FF_PROFILE_MPEG2_SNR_SCALABLE 3
2698 #define FF_PROFILE_MPEG2_MAIN 4
2699 #define FF_PROFILE_MPEG2_SIMPLE 5
2701 #define FF_PROFILE_H264_CONSTRAINED (1<<9) // 8+1; constraint_set1_flag
2702 #define FF_PROFILE_H264_INTRA (1<<11) // 8+3; constraint_set3_flag
2704 #define FF_PROFILE_H264_BASELINE 66
2705 #define FF_PROFILE_H264_CONSTRAINED_BASELINE (66|FF_PROFILE_H264_CONSTRAINED)
2706 #define FF_PROFILE_H264_MAIN 77
2707 #define FF_PROFILE_H264_EXTENDED 88
2708 #define FF_PROFILE_H264_HIGH 100
2709 #define FF_PROFILE_H264_HIGH_10 110
2710 #define FF_PROFILE_H264_HIGH_10_INTRA (110|FF_PROFILE_H264_INTRA)
2711 #define FF_PROFILE_H264_HIGH_422 122
2712 #define FF_PROFILE_H264_HIGH_422_INTRA (122|FF_PROFILE_H264_INTRA)
2713 #define FF_PROFILE_H264_HIGH_444 144
2714 #define FF_PROFILE_H264_HIGH_444_PREDICTIVE 244
2715 #define FF_PROFILE_H264_HIGH_444_INTRA (244|FF_PROFILE_H264_INTRA)
2716 #define FF_PROFILE_H264_CAVLC_444 44
2718 #define FF_PROFILE_VC1_SIMPLE 0
2719 #define FF_PROFILE_VC1_MAIN 1
2720 #define FF_PROFILE_VC1_COMPLEX 2
2721 #define FF_PROFILE_VC1_ADVANCED 3
2723 #define FF_PROFILE_MPEG4_SIMPLE 0
2724 #define FF_PROFILE_MPEG4_SIMPLE_SCALABLE 1
2725 #define FF_PROFILE_MPEG4_CORE 2
2726 #define FF_PROFILE_MPEG4_MAIN 3
2727 #define FF_PROFILE_MPEG4_N_BIT 4
2728 #define FF_PROFILE_MPEG4_SCALABLE_TEXTURE 5
2729 #define FF_PROFILE_MPEG4_SIMPLE_FACE_ANIMATION 6
2730 #define FF_PROFILE_MPEG4_BASIC_ANIMATED_TEXTURE 7
2731 #define FF_PROFILE_MPEG4_HYBRID 8
2732 #define FF_PROFILE_MPEG4_ADVANCED_REAL_TIME 9
2733 #define FF_PROFILE_MPEG4_CORE_SCALABLE 10
2734 #define FF_PROFILE_MPEG4_ADVANCED_CODING 11
2735 #define FF_PROFILE_MPEG4_ADVANCED_CORE 12
2736 #define FF_PROFILE_MPEG4_ADVANCED_SCALABLE_TEXTURE 13
2737 #define FF_PROFILE_MPEG4_SIMPLE_STUDIO 14
2738 #define FF_PROFILE_MPEG4_ADVANCED_SIMPLE 15
2740 #define FF_PROFILE_JPEG2000_CSTREAM_RESTRICTION_0 0
2741 #define FF_PROFILE_JPEG2000_CSTREAM_RESTRICTION_1 1
2742 #define FF_PROFILE_JPEG2000_CSTREAM_NO_RESTRICTION 2
2743 #define FF_PROFILE_JPEG2000_DCINEMA_2K 3
2744 #define FF_PROFILE_JPEG2000_DCINEMA_4K 4
2748 * - encoding: Set by user.
2749 * - decoding: Set by libavcodec.
2752 #define FF_LEVEL_UNKNOWN -99
2755 * Skip loop filtering for selected frames.
2756 * - encoding: unused
2757 * - decoding: Set by user.
2759 enum AVDiscard skip_loop_filter;
2762 * Skip IDCT/dequantization for selected frames.
2763 * - encoding: unused
2764 * - decoding: Set by user.
2766 enum AVDiscard skip_idct;
2769 * Skip decoding for selected frames.
2770 * - encoding: unused
2771 * - decoding: Set by user.
2773 enum AVDiscard skip_frame;
2776 * Header containing style information for text subtitles.
2777 * For SUBTITLE_ASS subtitle type, it should contain the whole ASS
2778 * [Script Info] and [V4+ Styles] section, plus the [Events] line and
2779 * the Format line following. It shouldn't include any Dialogue line.
2780 * - encoding: Set/allocated/freed by user (before avcodec_open2())
2781 * - decoding: Set/allocated/freed by libavcodec (by avcodec_open2())
2783 uint8_t *subtitle_header;
2784 int subtitle_header_size;
2787 * Simulates errors in the bitstream to test error concealment.
2788 * - encoding: Set by user.
2789 * - decoding: unused
2794 * Current packet as passed into the decoder, to avoid having
2795 * to pass the packet into every function. Currently only valid
2796 * inside lavc and get/release_buffer callbacks.
2797 * - decoding: set by avcodec_decode_*, read by get_buffer() for setting pkt_pts
2798 * - encoding: unused
2803 * VBV delay coded in the last frame (in periods of a 27 MHz clock).
2804 * Used for compliant TS muxing.
2805 * - encoding: Set by libavcodec.
2806 * - decoding: unused.
2811 * Timebase in which pkt_dts/pts and AVPacket.dts/pts are.
2812 * Code outside libavcodec should access this field using:
2813 * av_codec_{get,set}_pkt_timebase(avctx)
2814 * - encoding unused.
2815 * - decoding set by user.
2817 AVRational pkt_timebase;
2821 * Code outside libavcodec should access this field using:
2822 * av_codec_{get,set}_codec_descriptor(avctx)
2823 * - encoding: unused.
2824 * - decoding: set by libavcodec.
2826 const AVCodecDescriptor *codec_descriptor;
2830 * low resolution decoding, 1-> 1/2 size, 2->1/4 size
2831 * - encoding: unused
2832 * - decoding: Set by user.
2833 * Code outside libavcodec should access this field using:
2834 * av_codec_{get,set}_lowres(avctx)
2840 * Current statistics for PTS correction.
2841 * - decoding: maintained and used by libavcodec, not intended to be used by user apps
2842 * - encoding: unused
2844 int64_t pts_correction_num_faulty_pts; /// Number of incorrect PTS values so far
2845 int64_t pts_correction_num_faulty_dts; /// Number of incorrect DTS values so far
2846 int64_t pts_correction_last_pts; /// PTS of the last frame
2847 int64_t pts_correction_last_dts; /// DTS of the last frame
2850 * Character encoding of the input subtitles file.
2851 * - decoding: set by user
2852 * - encoding: unused
2857 * Subtitles character encoding mode. Formats or codecs might be adjusting
2858 * this setting (if they are doing the conversion themselves for instance).
2859 * - decoding: set by libavcodec
2860 * - encoding: unused
2862 int sub_charenc_mode;
2863 #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)
2864 #define FF_SUB_CHARENC_MODE_AUTOMATIC 0 ///< libavcodec will select the mode itself
2865 #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
2869 AVRational av_codec_get_pkt_timebase (const AVCodecContext *avctx);
2870 void av_codec_set_pkt_timebase (AVCodecContext *avctx, AVRational val);
2872 const AVCodecDescriptor *av_codec_get_codec_descriptor(const AVCodecContext *avctx);
2873 void av_codec_set_codec_descriptor(AVCodecContext *avctx, const AVCodecDescriptor *desc);
2875 int av_codec_get_lowres(const AVCodecContext *avctx);
2876 void av_codec_set_lowres(AVCodecContext *avctx, int val);
2881 typedef struct AVProfile {
2883 const char *name; ///< short name for the profile
2886 typedef struct AVCodecDefault AVCodecDefault;
2893 typedef struct AVCodec {
2895 * Name of the codec implementation.
2896 * The name is globally unique among encoders and among decoders (but an
2897 * encoder and a decoder can share the same name).
2898 * This is the primary way to find a codec from the user perspective.
2902 * Descriptive name for the codec, meant to be more human readable than name.
2903 * You should use the NULL_IF_CONFIG_SMALL() macro to define it.
2905 const char *long_name;
2906 enum AVMediaType type;
2909 * Codec capabilities.
2913 const AVRational *supported_framerates; ///< array of supported framerates, or NULL if any, array is terminated by {0,0}
2914 const enum AVPixelFormat *pix_fmts; ///< array of supported pixel formats, or NULL if unknown, array is terminated by -1
2915 const int *supported_samplerates; ///< array of supported audio samplerates, or NULL if unknown, array is terminated by 0
2916 const enum AVSampleFormat *sample_fmts; ///< array of supported sample formats, or NULL if unknown, array is terminated by -1
2917 const uint64_t *channel_layouts; ///< array of support channel layouts, or NULL if unknown. array is terminated by 0
2918 uint8_t max_lowres; ///< maximum value for lowres supported by the decoder
2919 const AVClass *priv_class; ///< AVClass for the private context
2920 const AVProfile *profiles; ///< array of recognized profiles, or NULL if unknown, array is terminated by {FF_PROFILE_UNKNOWN}
2922 /*****************************************************************
2923 * No fields below this line are part of the public API. They
2924 * may not be used outside of libavcodec and can be changed and
2926 * New public fields should be added right above.
2927 *****************************************************************
2930 struct AVCodec *next;
2932 * @name Frame-level threading support functions
2936 * If defined, called on thread contexts when they are created.
2937 * If the codec allocates writable tables in init(), re-allocate them here.
2938 * priv_data will be set to a copy of the original.
2940 int (*init_thread_copy)(AVCodecContext *);
2942 * Copy necessary context variables from a previous thread context to the current one.
2943 * If not defined, the next thread will start automatically; otherwise, the codec
2944 * must call ff_thread_finish_setup().
2946 * dst and src will (rarely) point to the same context, in which case memcpy should be skipped.
2948 int (*update_thread_context)(AVCodecContext *dst, const AVCodecContext *src);
2952 * Private codec-specific defaults.
2954 const AVCodecDefault *defaults;
2957 * Initialize codec static data, called from avcodec_register().
2959 void (*init_static_data)(struct AVCodec *codec);
2961 int (*init)(AVCodecContext *);
2962 int (*encode_sub)(AVCodecContext *, uint8_t *buf, int buf_size,
2963 const struct AVSubtitle *sub);
2965 * Encode data to an AVPacket.
2967 * @param avctx codec context
2968 * @param avpkt output AVPacket (may contain a user-provided buffer)
2969 * @param[in] frame AVFrame containing the raw data to be encoded
2970 * @param[out] got_packet_ptr encoder sets to 0 or 1 to indicate that a
2971 * non-empty packet was returned in avpkt.
2972 * @return 0 on success, negative error code on failure
2974 int (*encode2)(AVCodecContext *avctx, AVPacket *avpkt, const AVFrame *frame,
2975 int *got_packet_ptr);
2976 int (*decode)(AVCodecContext *, void *outdata, int *outdata_size, AVPacket *avpkt);
2977 int (*close)(AVCodecContext *);
2980 * Will be called when seeking
2982 void (*flush)(AVCodecContext *);
2988 typedef struct AVHWAccel {
2990 * Name of the hardware accelerated codec.
2991 * The name is globally unique among encoders and among decoders (but an
2992 * encoder and a decoder can share the same name).
2997 * Type of codec implemented by the hardware accelerator.
2999 * See AVMEDIA_TYPE_xxx
3001 enum AVMediaType type;
3004 * Codec implemented by the hardware accelerator.
3006 * See AV_CODEC_ID_xxx
3011 * Supported pixel format.
3013 * Only hardware accelerated formats are supported here.
3015 enum AVPixelFormat pix_fmt;
3018 * Hardware accelerated codec capabilities.
3019 * see FF_HWACCEL_CODEC_CAP_*
3023 struct AVHWAccel *next;
3026 * Called at the beginning of each frame or field picture.
3028 * Meaningful frame information (codec specific) is guaranteed to
3029 * be parsed at this point. This function is mandatory.
3031 * Note that buf can be NULL along with buf_size set to 0.
3032 * Otherwise, this means the whole frame is available at this point.
3034 * @param avctx the codec context
3035 * @param buf the frame data buffer base
3036 * @param buf_size the size of the frame in bytes
3037 * @return zero if successful, a negative value otherwise
3039 int (*start_frame)(AVCodecContext *avctx, const uint8_t *buf, uint32_t buf_size);
3042 * Callback for each slice.
3044 * Meaningful slice information (codec specific) is guaranteed to
3045 * be parsed at this point. This function is mandatory.
3047 * @param avctx the codec context
3048 * @param buf the slice data buffer base
3049 * @param buf_size the size of the slice in bytes
3050 * @return zero if successful, a negative value otherwise
3052 int (*decode_slice)(AVCodecContext *avctx, const uint8_t *buf, uint32_t buf_size);
3055 * Called at the end of each frame or field picture.
3057 * The whole picture is parsed at this point and can now be sent
3058 * to the hardware accelerator. This function is mandatory.
3060 * @param avctx the codec context
3061 * @return zero if successful, a negative value otherwise
3063 int (*end_frame)(AVCodecContext *avctx);
3066 * Size of HW accelerator private data.
3068 * Private data is allocated with av_mallocz() before
3069 * AVCodecContext.get_buffer() and deallocated after
3070 * AVCodecContext.release_buffer().
3076 * @defgroup lavc_picture AVPicture
3078 * Functions for working with AVPicture
3083 * Picture data structure.
3085 * Up to four components can be stored into it, the last component is
3088 typedef struct AVPicture {
3089 uint8_t *data[AV_NUM_DATA_POINTERS]; ///< pointers to the image data planes
3090 int linesize[AV_NUM_DATA_POINTERS]; ///< number of bytes per line
3097 enum AVSubtitleType {
3100 SUBTITLE_BITMAP, ///< A bitmap, pict will be set
3103 * Plain text, the text field must be set by the decoder and is
3104 * authoritative. ass and pict fields may contain approximations.
3109 * Formatted text, the ass field must be set by the decoder and is
3110 * authoritative. pict and text fields may contain approximations.
3115 #define AV_SUBTITLE_FLAG_FORCED 0x00000001
3117 typedef struct AVSubtitleRect {
3118 int x; ///< top left corner of pict, undefined when pict is not set
3119 int y; ///< top left corner of pict, undefined when pict is not set
3120 int w; ///< width of pict, undefined when pict is not set
3121 int h; ///< height of pict, undefined when pict is not set
3122 int nb_colors; ///< number of colors in pict, undefined when pict is not set
3125 * data+linesize for the bitmap of this subtitle.
3126 * can be set for text/ass as well once they where rendered
3129 enum AVSubtitleType type;
3131 char *text; ///< 0 terminated plain UTF-8 text
3134 * 0 terminated ASS/SSA compatible event line.
3135 * The presentation of this is unaffected by the other values in this
3143 typedef struct AVSubtitle {
3144 uint16_t format; /* 0 = graphics */
3145 uint32_t start_display_time; /* relative to packet pts, in ms */
3146 uint32_t end_display_time; /* relative to packet pts, in ms */
3148 AVSubtitleRect **rects;
3149 int64_t pts; ///< Same as packet pts, in AV_TIME_BASE
3153 * If c is NULL, returns the first registered codec,
3154 * if c is non-NULL, returns the next registered codec after c,
3155 * or NULL if c is the last one.
3157 AVCodec *av_codec_next(const AVCodec *c);
3160 * Return the LIBAVCODEC_VERSION_INT constant.
3162 unsigned avcodec_version(void);
3165 * Return the libavcodec build-time configuration.
3167 const char *avcodec_configuration(void);
3170 * Return the libavcodec license.
3172 const char *avcodec_license(void);
3175 * Register the codec codec and initialize libavcodec.
3177 * @warning either this function or avcodec_register_all() must be called
3178 * before any other libavcodec functions.
3180 * @see avcodec_register_all()
3182 void avcodec_register(AVCodec *codec);
3185 * Register all the codecs, parsers and bitstream filters which were enabled at
3186 * configuration time. If you do not call this function you can select exactly
3187 * which formats you want to support, by using the individual registration
3190 * @see avcodec_register
3191 * @see av_register_codec_parser
3192 * @see av_register_bitstream_filter
3194 void avcodec_register_all(void);
3197 #if FF_API_ALLOC_CONTEXT
3199 * Allocate an AVCodecContext and set its fields to default values. The
3200 * resulting struct can be deallocated by simply calling av_free().
3202 * @return An AVCodecContext filled with default values or NULL on failure.
3203 * @see avcodec_get_context_defaults
3205 * @deprecated use avcodec_alloc_context3()
3207 attribute_deprecated
3208 AVCodecContext *avcodec_alloc_context(void);
3210 /** THIS FUNCTION IS NOT YET PART OF THE PUBLIC API!
3211 * we WILL change its arguments and name a few times! */
3212 attribute_deprecated
3213 AVCodecContext *avcodec_alloc_context2(enum AVMediaType);
3216 * Set the fields of the given AVCodecContext to default values.
3218 * @param s The AVCodecContext of which the fields should be set to default values.
3219 * @deprecated use avcodec_get_context_defaults3
3221 attribute_deprecated
3222 void avcodec_get_context_defaults(AVCodecContext *s);
3224 /** THIS FUNCTION IS NOT YET PART OF THE PUBLIC API!
3225 * we WILL change its arguments and name a few times! */
3226 attribute_deprecated
3227 void avcodec_get_context_defaults2(AVCodecContext *s, enum AVMediaType);
3231 * Allocate an AVCodecContext and set its fields to default values. The
3232 * resulting struct can be deallocated by calling avcodec_close() on it followed
3235 * @param codec if non-NULL, allocate private data and initialize defaults
3236 * for the given codec. It is illegal to then call avcodec_open2()
3237 * with a different codec.
3238 * If NULL, then the codec-specific defaults won't be initialized,
3239 * which may result in suboptimal default settings (this is
3240 * important mainly for encoders, e.g. libx264).
3242 * @return An AVCodecContext filled with default values or NULL on failure.
3243 * @see avcodec_get_context_defaults
3245 AVCodecContext *avcodec_alloc_context3(const AVCodec *codec);
3248 * Set the fields of the given AVCodecContext to default values corresponding
3249 * to the given codec (defaults may be codec-dependent).
3251 * Do not call this function if a non-NULL codec has been passed
3252 * to avcodec_alloc_context3() that allocated this AVCodecContext.
3253 * If codec is non-NULL, it is illegal to call avcodec_open2() with a
3254 * different codec on this AVCodecContext.
3256 int avcodec_get_context_defaults3(AVCodecContext *s, const AVCodec *codec);
3259 * Get the AVClass for AVCodecContext. It can be used in combination with
3260 * AV_OPT_SEARCH_FAKE_OBJ for examining options.
3262 * @see av_opt_find().
3264 const AVClass *avcodec_get_class(void);
3267 * Get the AVClass for AVFrame. It can be used in combination with
3268 * AV_OPT_SEARCH_FAKE_OBJ for examining options.
3270 * @see av_opt_find().
3272 const AVClass *avcodec_get_frame_class(void);
3275 * Get the AVClass for AVSubtitleRect. It can be used in combination with
3276 * AV_OPT_SEARCH_FAKE_OBJ for examining options.
3278 * @see av_opt_find().
3280 const AVClass *avcodec_get_subtitle_rect_class(void);
3283 * Copy the settings of the source AVCodecContext into the destination
3284 * AVCodecContext. The resulting destination codec context will be
3285 * unopened, i.e. you are required to call avcodec_open2() before you
3286 * can use this AVCodecContext to decode/encode video/audio data.
3288 * @param dest target codec context, should be initialized with
3289 * avcodec_alloc_context3(NULL), but otherwise uninitialized
3290 * @param src source codec context
3291 * @return AVERROR() on error (e.g. memory allocation error), 0 on success
3293 int avcodec_copy_context(AVCodecContext *dest, const AVCodecContext *src);
3296 * Allocate an AVFrame and set its fields to default values. The resulting
3297 * struct must be freed using avcodec_free_frame().
3299 * @return An AVFrame filled with default values or NULL on failure.
3300 * @see avcodec_get_frame_defaults
3302 AVFrame *avcodec_alloc_frame(void);
3305 * Set the fields of the given AVFrame to default values.
3307 * @param frame The AVFrame of which the fields should be set to default values.
3309 void avcodec_get_frame_defaults(AVFrame *frame);
3312 * Free the frame and any dynamically allocated objects in it,
3313 * e.g. extended_data.
3315 * @param frame frame to be freed. The pointer will be set to NULL.
3317 * @warning this function does NOT free the data buffers themselves
3318 * (it does not know how, since they might have been allocated with
3319 * a custom get_buffer()).
3321 void avcodec_free_frame(AVFrame **frame);
3323 #if FF_API_AVCODEC_OPEN
3325 * Initialize the AVCodecContext to use the given AVCodec. Prior to using this
3326 * function the context has to be allocated.
3328 * The functions avcodec_find_decoder_by_name(), avcodec_find_encoder_by_name(),
3329 * avcodec_find_decoder() and avcodec_find_encoder() provide an easy way for
3330 * retrieving a codec.
3332 * @warning This function is not thread safe!
3335 * avcodec_register_all();
3336 * codec = avcodec_find_decoder(AV_CODEC_ID_H264);
3340 * context = avcodec_alloc_context3(codec);
3342 * if (avcodec_open(context, codec) < 0)
3346 * @param avctx The context which will be set up to use the given codec.
3347 * @param codec The codec to use within the context.
3348 * @return zero on success, a negative value on error
3349 * @see avcodec_alloc_context3, avcodec_find_decoder, avcodec_find_encoder, avcodec_close
3351 * @deprecated use avcodec_open2
3353 attribute_deprecated
3354 int avcodec_open(AVCodecContext *avctx, AVCodec *codec);
3358 * Initialize the AVCodecContext to use the given AVCodec. Prior to using this
3359 * function the context has to be allocated with avcodec_alloc_context3().
3361 * The functions avcodec_find_decoder_by_name(), avcodec_find_encoder_by_name(),
3362 * avcodec_find_decoder() and avcodec_find_encoder() provide an easy way for
3363 * retrieving a codec.
3365 * @warning This function is not thread safe!
3368 * avcodec_register_all();
3369 * av_dict_set(&opts, "b", "2.5M", 0);
3370 * codec = avcodec_find_decoder(AV_CODEC_ID_H264);
3374 * context = avcodec_alloc_context3(codec);
3376 * if (avcodec_open2(context, codec, opts) < 0)
3380 * @param avctx The context to initialize.
3381 * @param codec The codec to open this context for. If a non-NULL codec has been
3382 * previously passed to avcodec_alloc_context3() or
3383 * avcodec_get_context_defaults3() for this context, then this
3384 * parameter MUST be either NULL or equal to the previously passed
3386 * @param options A dictionary filled with AVCodecContext and codec-private options.
3387 * On return this object will be filled with options that were not found.
3389 * @return zero on success, a negative value on error
3390 * @see avcodec_alloc_context3(), avcodec_find_decoder(), avcodec_find_encoder(),
3391 * av_dict_set(), av_opt_find().
3393 int avcodec_open2(AVCodecContext *avctx, const AVCodec *codec, AVDictionary **options);
3396 * Close a given AVCodecContext and free all the data associated with it
3397 * (but not the AVCodecContext itself).
3399 * Calling this function on an AVCodecContext that hasn't been opened will free
3400 * the codec-specific data allocated in avcodec_alloc_context3() /
3401 * avcodec_get_context_defaults3() with a non-NULL codec. Subsequent calls will
3404 int avcodec_close(AVCodecContext *avctx);
3407 * Free all allocated data in the given subtitle struct.
3409 * @param sub AVSubtitle to free.
3411 void avsubtitle_free(AVSubtitle *sub);
3418 * @addtogroup lavc_packet
3422 #if FF_API_DESTRUCT_PACKET
3424 * Default packet destructor.
3425 * @deprecated use the AVBuffer API instead
3427 attribute_deprecated
3428 void av_destruct_packet(AVPacket *pkt);
3432 * Initialize optional fields of a packet with default values.
3434 * Note, this does not touch the data and size members, which have to be
3435 * initialized separately.
3439 void av_init_packet(AVPacket *pkt);
3442 * Allocate the payload of a packet and initialize its fields with
3446 * @param size wanted payload size
3447 * @return 0 if OK, AVERROR_xxx otherwise
3449 int av_new_packet(AVPacket *pkt, int size);
3452 * Reduce packet size, correctly zeroing padding
3455 * @param size new size
3457 void av_shrink_packet(AVPacket *pkt, int size);
3460 * Increase packet size, correctly zeroing padding
3463 * @param grow_by number of bytes by which to increase the size of the packet
3465 int av_grow_packet(AVPacket *pkt, int grow_by);
3468 * Initialize a reference-counted packet from av_malloc()ed data.
3470 * @param pkt packet to be initialized. This function will set the data, size,
3471 * buf and destruct fields, all others are left untouched.
3472 * @param data Data allocated by av_malloc() to be used as packet data. If this
3473 * function returns successfully, the data is owned by the underlying AVBuffer.
3474 * The caller may not access the data through other means.
3475 * @param size size of data in bytes, without the padding. I.e. the full buffer
3476 * size is assumed to be size + FF_INPUT_BUFFER_PADDING_SIZE.
3478 * @return 0 on success, a negative AVERROR on error
3480 int av_packet_from_data(AVPacket *pkt, uint8_t *data, int size);
3483 * @warning This is a hack - the packet memory allocation stuff is broken. The
3484 * packet is allocated if it was not really allocated.
3486 int av_dup_packet(AVPacket *pkt);
3489 * Copy packet, including contents
3491 * @return 0 on success, negative AVERROR on fail
3493 int av_copy_packet(AVPacket *dst, AVPacket *src);
3496 * Copy packet side data
3498 * @return 0 on success, negative AVERROR on fail
3500 int av_copy_packet_side_data(AVPacket *dst, AVPacket *src);
3505 * @param pkt packet to free
3507 void av_free_packet(AVPacket *pkt);
3510 * Allocate new information of a packet.
3513 * @param type side information type
3514 * @param size side information size
3515 * @return pointer to fresh allocated data or NULL otherwise
3517 uint8_t* av_packet_new_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
3521 * Shrink the already allocated side data buffer
3524 * @param type side information type
3525 * @param size new side information size
3526 * @return 0 on success, < 0 on failure
3528 int av_packet_shrink_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
3532 * Get side information from packet.
3535 * @param type desired side information type
3536 * @param size pointer for side information size to store (optional)
3537 * @return pointer to data if present or NULL otherwise
3539 uint8_t* av_packet_get_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
3542 int av_packet_merge_side_data(AVPacket *pkt);
3544 int av_packet_split_side_data(AVPacket *pkt);
3548 * Convenience function to free all the side data stored.
3549 * All the other fields stay untouched.
3553 void av_packet_free_side_data(AVPacket *pkt);
3556 * Setup a new reference to the data described by a given packet
3558 * If src is reference-counted, setup dst as a new reference to the
3559 * buffer in src. Otherwise allocate a new buffer in dst and copy the
3560 * data from src into it.
3562 * All the other fields are copied from src.
3564 * @see av_packet_unref
3566 * @param dst Destination packet
3567 * @param src Source packet
3569 * @return 0 on success, a negative AVERROR on error.
3571 int av_packet_ref(AVPacket *dst, AVPacket *src);
3576 * Unreference the buffer referenced by the packet and reset the
3577 * remaining packet fields to their default values.
3579 * @param pkt The packet to be unreferenced.
3581 void av_packet_unref(AVPacket *pkt);
3584 * Move every field in src to dst and reset src.
3586 * @see av_packet_unref
3588 * @param src Source packet, will be reset
3589 * @param dst Destination packet
3591 void av_packet_move_ref(AVPacket *dst, AVPacket *src);
3594 * Copy only "properties" fields from src to dst.
3596 * Properties for the purpose of this function are all the fields
3597 * beside those related to the packet data (buf, data, size)
3599 * @param dst Destination packet
3600 * @param src Source packet
3602 * @return 0 on success AVERROR on failure.
3605 int av_packet_copy_props(AVPacket *dst, const AVPacket *src);
3612 * @addtogroup lavc_decoding
3617 * Find a registered decoder with a matching codec ID.
3619 * @param id AVCodecID of the requested decoder
3620 * @return A decoder if one was found, NULL otherwise.
3622 AVCodec *avcodec_find_decoder(enum AVCodecID id);
3625 * Find a registered decoder with the specified name.
3627 * @param name name of the requested decoder
3628 * @return A decoder if one was found, NULL otherwise.
3630 AVCodec *avcodec_find_decoder_by_name(const char *name);
3632 #if FF_API_GET_BUFFER
3633 attribute_deprecated int avcodec_default_get_buffer(AVCodecContext *s, AVFrame *pic);
3634 attribute_deprecated void avcodec_default_release_buffer(AVCodecContext *s, AVFrame *pic);
3635 attribute_deprecated int avcodec_default_reget_buffer(AVCodecContext *s, AVFrame *pic);
3639 * The default callback for AVCodecContext.get_buffer2(). It is made public so
3640 * it can be called by custom get_buffer2() implementations for decoders without
3641 * CODEC_CAP_DR1 set.
3643 int avcodec_default_get_buffer2(AVCodecContext *s, AVFrame *frame, int flags);
3646 * Return the amount of padding in pixels which the get_buffer callback must
3647 * provide around the edge of the image for codecs which do not have the
3648 * CODEC_FLAG_EMU_EDGE flag.
3650 * @return Required padding in pixels.
3652 unsigned avcodec_get_edge_width(void);
3655 * Modify width and height values so that they will result in a memory
3656 * buffer that is acceptable for the codec if you do not use any horizontal
3659 * May only be used if a codec with CODEC_CAP_DR1 has been opened.
3660 * If CODEC_FLAG_EMU_EDGE is not set, the dimensions must have been increased
3661 * according to avcodec_get_edge_width() before.
3663 void avcodec_align_dimensions(AVCodecContext *s, int *width, int *height);
3666 * Modify width and height values so that they will result in a memory
3667 * buffer that is acceptable for the codec if you also ensure that all
3668 * line sizes are a multiple of the respective linesize_align[i].
3670 * May only be used if a codec with CODEC_CAP_DR1 has been opened.
3671 * If CODEC_FLAG_EMU_EDGE is not set, the dimensions must have been increased
3672 * according to avcodec_get_edge_width() before.
3674 void avcodec_align_dimensions2(AVCodecContext *s, int *width, int *height,
3675 int linesize_align[AV_NUM_DATA_POINTERS]);
3678 * Converts AVChromaLocation to swscale x/y chroma position.
3680 * The positions represent the chroma (0,0) position in a coordinates system
3681 * with luma (0,0) representing the origin and luma(1,1) representing 256,256
3683 * @param xpos horizontal chroma sample position
3684 * @param ypos vertical chroma sample position
3686 int avcodec_enum_to_chroma_pos(int *xpos, int *ypos, enum AVChromaLocation pos);
3689 * Converts swscale x/y chroma position to AVChromaLocation.
3691 * The positions represent the chroma (0,0) position in a coordinates system
3692 * with luma (0,0) representing the origin and luma(1,1) representing 256,256
3694 * @param xpos horizontal chroma sample position
3695 * @param ypos vertical chroma sample position
3697 enum AVChromaLocation avcodec_chroma_pos_to_enum(int xpos, int ypos);
3699 #if FF_API_OLD_DECODE_AUDIO
3701 * Wrapper function which calls avcodec_decode_audio4.
3703 * @deprecated Use avcodec_decode_audio4 instead.
3705 * Decode the audio frame of size avpkt->size from avpkt->data into samples.
3706 * Some decoders may support multiple frames in a single AVPacket, such
3707 * decoders would then just decode the first frame. In this case,
3708 * avcodec_decode_audio3 has to be called again with an AVPacket that contains
3709 * the remaining data in order to decode the second frame etc.
3711 * could be outputted, frame_size_ptr is zero. Otherwise, it is the
3712 * decompressed frame size in bytes.
3714 * @warning You must set frame_size_ptr to the allocated size of the
3715 * output buffer before calling avcodec_decode_audio3().
3717 * @warning The input buffer must be FF_INPUT_BUFFER_PADDING_SIZE larger than
3718 * the actual read bytes because some optimized bitstream readers read 32 or 64
3719 * bits at once and could read over the end.
3721 * @warning The end of the input buffer avpkt->data should be set to 0 to ensure that
3722 * no overreading happens for damaged MPEG streams.
3724 * @warning You must not provide a custom get_buffer() when using
3725 * avcodec_decode_audio3(). Doing so will override it with
3726 * avcodec_default_get_buffer. Use avcodec_decode_audio4() instead,
3727 * which does allow the application to provide a custom get_buffer().
3729 * @note You might have to align the input buffer avpkt->data and output buffer
3730 * samples. The alignment requirements depend on the CPU: On some CPUs it isn't
3731 * necessary at all, on others it won't work at all if not aligned and on others
3732 * it will work but it will have an impact on performance.
3734 * In practice, avpkt->data should have 4 byte alignment at minimum and
3735 * samples should be 16 byte aligned unless the CPU doesn't need it
3736 * (AltiVec and SSE do).
3738 * @note Codecs which have the CODEC_CAP_DELAY capability set have a delay
3739 * between input and output, these need to be fed with avpkt->data=NULL,
3740 * avpkt->size=0 at the end to return the remaining frames.
3742 * @param avctx the codec context
3743 * @param[out] samples the output buffer, sample type in avctx->sample_fmt
3744 * If the sample format is planar, each channel plane will
3745 * be the same size, with no padding between channels.
3746 * @param[in,out] frame_size_ptr the output buffer size in bytes
3747 * @param[in] avpkt The input AVPacket containing the input buffer.
3748 * You can create such packet with av_init_packet() and by then setting
3749 * data and size, some decoders might in addition need other fields.
3750 * All decoders are designed to use the least fields possible though.
3751 * @return On error a negative value is returned, otherwise the number of bytes
3752 * used or zero if no frame data was decompressed (used) from the input AVPacket.
3754 attribute_deprecated int avcodec_decode_audio3(AVCodecContext *avctx, int16_t *samples,
3755 int *frame_size_ptr,
3760 * Decode the audio frame of size avpkt->size from avpkt->data into frame.
3762 * Some decoders may support multiple frames in a single AVPacket. Such
3763 * decoders would then just decode the first frame. In this case,
3764 * avcodec_decode_audio4 has to be called again with an AVPacket containing
3765 * the remaining data in order to decode the second frame, etc...
3766 * Even if no frames are returned, the packet needs to be fed to the decoder
3767 * with remaining data until it is completely consumed or an error occurs.
3769 * @warning The input buffer, avpkt->data must be FF_INPUT_BUFFER_PADDING_SIZE
3770 * larger than the actual read bytes because some optimized bitstream
3771 * readers read 32 or 64 bits at once and could read over the end.
3773 * @note You might have to align the input buffer. The alignment requirements
3774 * depend on the CPU and the decoder.
3776 * @param avctx the codec context
3777 * @param[out] frame The AVFrame in which to store decoded audio samples.
3778 * The decoder will allocate a buffer for the decoded frame by
3779 * calling the AVCodecContext.get_buffer2() callback.
3780 * When AVCodecContext.refcounted_frames is set to 1, the frame is
3781 * reference counted and the returned reference belongs to the
3782 * caller. The caller must release the frame using av_frame_unref()
3783 * when the frame is no longer needed. The caller may safely write
3784 * to the frame if av_frame_is_writable() returns 1.
3785 * When AVCodecContext.refcounted_frames is set to 0, the returned
3786 * reference belongs to the decoder and is valid only until the
3787 * next call to this function or until closing the decoder.
3788 * The caller may not write to it.
3789 * @param[out] got_frame_ptr Zero if no frame could be decoded, otherwise it is
3791 * @param[in] avpkt The input AVPacket containing the input buffer.
3792 * At least avpkt->data and avpkt->size should be set. Some
3793 * decoders might also require additional fields to be set.
3794 * @return A negative error code is returned if an error occurred during
3795 * decoding, otherwise the number of bytes consumed from the input
3796 * AVPacket is returned.
3798 int avcodec_decode_audio4(AVCodecContext *avctx, AVFrame *frame,
3799 int *got_frame_ptr, const AVPacket *avpkt);
3802 * Decode the video frame of size avpkt->size from avpkt->data into picture.
3803 * Some decoders may support multiple frames in a single AVPacket, such
3804 * decoders would then just decode the first frame.
3806 * @warning The input buffer must be FF_INPUT_BUFFER_PADDING_SIZE larger than
3807 * the actual read bytes because some optimized bitstream readers read 32 or 64
3808 * bits at once and could read over the end.
3810 * @warning The end of the input buffer buf should be set to 0 to ensure that
3811 * no overreading happens for damaged MPEG streams.
3813 * @note You might have to align the input buffer avpkt->data.
3814 * The alignment requirements depend on the CPU: on some CPUs it isn't
3815 * necessary at all, on others it won't work at all if not aligned and on others
3816 * it will work but it will have an impact on performance.
3818 * In practice, avpkt->data should have 4 byte alignment at minimum.
3820 * @note Codecs which have the CODEC_CAP_DELAY capability set have a delay
3821 * between input and output, these need to be fed with avpkt->data=NULL,
3822 * avpkt->size=0 at the end to return the remaining frames.
3824 * @param avctx the codec context
3825 * @param[out] picture The AVFrame in which the decoded video frame will be stored.
3826 * Use av_frame_alloc() to get an AVFrame. The codec will
3827 * allocate memory for the actual bitmap by calling the
3828 * AVCodecContext.get_buffer2() callback.
3829 * When AVCodecContext.refcounted_frames is set to 1, the frame is
3830 * reference counted and the returned reference belongs to the
3831 * caller. The caller must release the frame using av_frame_unref()
3832 * when the frame is no longer needed. The caller may safely write
3833 * to the frame if av_frame_is_writable() returns 1.
3834 * When AVCodecContext.refcounted_frames is set to 0, the returned
3835 * reference belongs to the decoder and is valid only until the
3836 * next call to this function or until closing the decoder. The
3837 * caller may not write to it.
3839 * @param[in] avpkt The input AVPacket containing the input buffer.
3840 * You can create such packet with av_init_packet() and by then setting
3841 * data and size, some decoders might in addition need other fields like
3842 * flags&AV_PKT_FLAG_KEY. All decoders are designed to use the least
3844 * @param[in,out] got_picture_ptr Zero if no frame could be decompressed, otherwise, it is nonzero.
3845 * @return On error a negative value is returned, otherwise the number of bytes
3846 * used or zero if no frame could be decompressed.
3848 int avcodec_decode_video2(AVCodecContext *avctx, AVFrame *picture,
3849 int *got_picture_ptr,
3850 const AVPacket *avpkt);
3853 * Decode a subtitle message.
3854 * Return a negative value on error, otherwise return the number of bytes used.
3855 * If no subtitle could be decompressed, got_sub_ptr is zero.
3856 * Otherwise, the subtitle is stored in *sub.
3857 * Note that CODEC_CAP_DR1 is not available for subtitle codecs. This is for
3858 * simplicity, because the performance difference is expect to be negligible
3859 * and reusing a get_buffer written for video codecs would probably perform badly
3860 * due to a potentially very different allocation pattern.
3862 * @param avctx the codec context
3863 * @param[out] sub The AVSubtitle in which the decoded subtitle will be stored, must be
3864 freed with avsubtitle_free if *got_sub_ptr is set.
3865 * @param[in,out] got_sub_ptr Zero if no subtitle could be decompressed, otherwise, it is nonzero.
3866 * @param[in] avpkt The input AVPacket containing the input buffer.
3868 int avcodec_decode_subtitle2(AVCodecContext *avctx, AVSubtitle *sub,
3873 * @defgroup lavc_parsing Frame parsing
3877 enum AVPictureStructure {
3878 AV_PICTURE_STRUCTURE_UNKNOWN, //< unknown
3879 AV_PICTURE_STRUCTURE_TOP_FIELD, //< coded as top field
3880 AV_PICTURE_STRUCTURE_BOTTOM_FIELD, //< coded as bottom field
3881 AV_PICTURE_STRUCTURE_FRAME, //< coded as frame
3884 typedef struct AVCodecParserContext {
3886 struct AVCodecParser *parser;
3887 int64_t frame_offset; /* offset of the current frame */
3888 int64_t cur_offset; /* current offset
3889 (incremented by each av_parser_parse()) */
3890 int64_t next_frame_offset; /* offset of the next frame */
3892 int pict_type; /* XXX: Put it back in AVCodecContext. */
3894 * This field is used for proper frame duration computation in lavf.
3895 * It signals, how much longer the frame duration of the current frame
3896 * is compared to normal frame duration.
3898 * frame_duration = (1 + repeat_pict) * time_base
3900 * It is used by codecs like H.264 to display telecined material.
3902 int repeat_pict; /* XXX: Put it back in AVCodecContext. */
3903 int64_t pts; /* pts of the current frame */
3904 int64_t dts; /* dts of the current frame */
3909 int fetch_timestamp;
3911 #define AV_PARSER_PTS_NB 4
3912 int cur_frame_start_index;
3913 int64_t cur_frame_offset[AV_PARSER_PTS_NB];
3914 int64_t cur_frame_pts[AV_PARSER_PTS_NB];
3915 int64_t cur_frame_dts[AV_PARSER_PTS_NB];
3918 #define PARSER_FLAG_COMPLETE_FRAMES 0x0001
3919 #define PARSER_FLAG_ONCE 0x0002
3920 /// Set if the parser has a valid file offset
3921 #define PARSER_FLAG_FETCHED_OFFSET 0x0004
3922 #define PARSER_FLAG_USE_CODEC_TS 0x1000
3924 int64_t offset; ///< byte offset from starting packet start
3925 int64_t cur_frame_end[AV_PARSER_PTS_NB];
3928 * Set by parser to 1 for key frames and 0 for non-key frames.
3929 * It is initialized to -1, so if the parser doesn't set this flag,
3930 * old-style fallback using AV_PICTURE_TYPE_I picture type as key frames
3936 * Time difference in stream time base units from the pts of this
3937 * packet to the point at which the output from the decoder has converged
3938 * independent from the availability of previous frames. That is, the
3939 * frames are virtually identical no matter if decoding started from
3940 * the very first frame or from this keyframe.
3941 * Is AV_NOPTS_VALUE if unknown.
3942 * This field is not the display duration of the current frame.
3943 * This field has no meaning if the packet does not have AV_PKT_FLAG_KEY
3946 * The purpose of this field is to allow seeking in streams that have no
3947 * keyframes in the conventional sense. It corresponds to the
3948 * recovery point SEI in H.264 and match_time_delta in NUT. It is also
3949 * essential for some types of subtitle streams to ensure that all
3950 * subtitles are correctly displayed after seeking.
3952 int64_t convergence_duration;
3954 // Timestamp generation support:
3956 * Synchronization point for start of timestamp generation.
3958 * Set to >0 for sync point, 0 for no sync point and <0 for undefined
3961 * For example, this corresponds to presence of H.264 buffering period
3967 * Offset of the current timestamp against last timestamp sync point in
3968 * units of AVCodecContext.time_base.
3970 * Set to INT_MIN when dts_sync_point unused. Otherwise, it must
3971 * contain a valid timestamp offset.
3973 * Note that the timestamp of sync point has usually a nonzero
3974 * dts_ref_dts_delta, which refers to the previous sync point. Offset of
3975 * the next frame after timestamp sync point will be usually 1.
3977 * For example, this corresponds to H.264 cpb_removal_delay.
3979 int dts_ref_dts_delta;
3982 * Presentation delay of current frame in units of AVCodecContext.time_base.
3984 * Set to INT_MIN when dts_sync_point unused. Otherwise, it must
3985 * contain valid non-negative timestamp delta (presentation time of a frame
3986 * must not lie in the past).
3988 * This delay represents the difference between decoding and presentation
3989 * time of the frame.
3991 * For example, this corresponds to H.264 dpb_output_delay.
3996 * Position of the packet in file.
3998 * Analogous to cur_frame_pts/dts
4000 int64_t cur_frame_pos[AV_PARSER_PTS_NB];
4003 * Byte position of currently parsed frame in stream.
4008 * Previous frame byte position.
4013 * Duration of the current frame.
4014 * For audio, this is in units of 1 / AVCodecContext.sample_rate.
4015 * For all other types, this is in units of AVCodecContext.time_base.
4019 enum AVFieldOrder field_order;
4022 * Indicate whether a picture is coded as a frame, top field or bottom field.
4024 * For example, H.264 field_pic_flag equal to 0 corresponds to
4025 * AV_PICTURE_STRUCTURE_FRAME. An H.264 picture with field_pic_flag
4026 * equal to 1 and bottom_field_flag equal to 0 corresponds to
4027 * AV_PICTURE_STRUCTURE_TOP_FIELD.
4029 enum AVPictureStructure picture_structure;
4032 * Picture number incremented in presentation or output order.
4033 * This field may be reinitialized at the first picture of a new sequence.
4035 * For example, this corresponds to H.264 PicOrderCnt.
4037 int output_picture_number;
4038 } AVCodecParserContext;
4040 typedef struct AVCodecParser {
4041 int codec_ids[5]; /* several codec IDs are permitted */
4043 int (*parser_init)(AVCodecParserContext *s);
4044 int (*parser_parse)(AVCodecParserContext *s,
4045 AVCodecContext *avctx,
4046 const uint8_t **poutbuf, int *poutbuf_size,
4047 const uint8_t *buf, int buf_size);
4048 void (*parser_close)(AVCodecParserContext *s);
4049 int (*split)(AVCodecContext *avctx, const uint8_t *buf, int buf_size);
4050 struct AVCodecParser *next;
4053 AVCodecParser *av_parser_next(AVCodecParser *c);
4055 void av_register_codec_parser(AVCodecParser *parser);
4056 AVCodecParserContext *av_parser_init(int codec_id);
4061 * @param s parser context.
4062 * @param avctx codec context.
4063 * @param poutbuf set to pointer to parsed buffer or NULL if not yet finished.
4064 * @param poutbuf_size set to size of parsed buffer or zero if not yet finished.
4065 * @param buf input buffer.
4066 * @param buf_size input length, to signal EOF, this should be 0 (so that the last frame can be output).
4067 * @param pts input presentation timestamp.
4068 * @param dts input decoding timestamp.
4069 * @param pos input byte position in stream.
4070 * @return the number of bytes of the input bitstream used.
4075 * len = av_parser_parse2(myparser, AVCodecContext, &data, &size,
4082 * decode_frame(data, size);
4086 int av_parser_parse2(AVCodecParserContext *s,
4087 AVCodecContext *avctx,
4088 uint8_t **poutbuf, int *poutbuf_size,
4089 const uint8_t *buf, int buf_size,
4090 int64_t pts, int64_t dts,
4094 * @return 0 if the output buffer is a subset of the input, 1 if it is allocated and must be freed
4095 * @deprecated use AVBitStreamFilter
4097 int av_parser_change(AVCodecParserContext *s,
4098 AVCodecContext *avctx,
4099 uint8_t **poutbuf, int *poutbuf_size,
4100 const uint8_t *buf, int buf_size, int keyframe);
4101 void av_parser_close(AVCodecParserContext *s);
4109 * @addtogroup lavc_encoding
4114 * Find a registered encoder with a matching codec ID.
4116 * @param id AVCodecID of the requested encoder
4117 * @return An encoder if one was found, NULL otherwise.
4119 AVCodec *avcodec_find_encoder(enum AVCodecID id);
4122 * Find a registered encoder with the specified name.
4124 * @param name name of the requested encoder
4125 * @return An encoder if one was found, NULL otherwise.
4127 AVCodec *avcodec_find_encoder_by_name(const char *name);
4129 #if FF_API_OLD_ENCODE_AUDIO
4131 * Encode an audio frame from samples into buf.
4133 * @deprecated Use avcodec_encode_audio2 instead.
4135 * @note The output buffer should be at least FF_MIN_BUFFER_SIZE bytes large.
4136 * However, for codecs with avctx->frame_size equal to 0 (e.g. PCM) the user
4137 * will know how much space is needed because it depends on the value passed
4138 * in buf_size as described below. In that case a lower value can be used.
4140 * @param avctx the codec context
4141 * @param[out] buf the output buffer
4142 * @param[in] buf_size the output buffer size
4143 * @param[in] samples the input buffer containing the samples
4144 * The number of samples read from this buffer is frame_size*channels,
4145 * both of which are defined in avctx.
4146 * For codecs which have avctx->frame_size equal to 0 (e.g. PCM) the number of
4147 * samples read from samples is equal to:
4148 * buf_size * 8 / (avctx->channels * av_get_bits_per_sample(avctx->codec_id))
4149 * This also implies that av_get_bits_per_sample() must not return 0 for these
4151 * @return On error a negative value is returned, on success zero or the number
4152 * of bytes used to encode the data read from the input buffer.
4154 int attribute_deprecated avcodec_encode_audio(AVCodecContext *avctx,
4155 uint8_t *buf, int buf_size,
4156 const short *samples);
4160 * Encode a frame of audio.
4162 * Takes input samples from frame and writes the next output packet, if
4163 * available, to avpkt. The output packet does not necessarily contain data for
4164 * the most recent frame, as encoders can delay, split, and combine input frames
4165 * internally as needed.
4167 * @param avctx codec context
4168 * @param avpkt output AVPacket.
4169 * The user can supply an output buffer by setting
4170 * avpkt->data and avpkt->size prior to calling the
4171 * function, but if the size of the user-provided data is not
4172 * large enough, encoding will fail. If avpkt->data and
4173 * avpkt->size are set, avpkt->destruct must also be set. All
4174 * other AVPacket fields will be reset by the encoder using
4175 * av_init_packet(). If avpkt->data is NULL, the encoder will
4176 * allocate it. The encoder will set avpkt->size to the size
4177 * of the output packet.
4179 * If this function fails or produces no output, avpkt will be
4180 * freed using av_free_packet() (i.e. avpkt->destruct will be
4181 * called to free the user supplied buffer).
4182 * @param[in] frame AVFrame containing the raw audio data to be encoded.
4183 * May be NULL when flushing an encoder that has the
4184 * CODEC_CAP_DELAY capability set.
4185 * If CODEC_CAP_VARIABLE_FRAME_SIZE is set, then each frame
4186 * can have any number of samples.
4187 * If it is not set, frame->nb_samples must be equal to
4188 * avctx->frame_size for all frames except the last.
4189 * The final frame may be smaller than avctx->frame_size.
4190 * @param[out] got_packet_ptr This field is set to 1 by libavcodec if the
4191 * output packet is non-empty, and to 0 if it is
4192 * empty. If the function returns an error, the
4193 * packet can be assumed to be invalid, and the
4194 * value of got_packet_ptr is undefined and should
4196 * @return 0 on success, negative error code on failure
4198 int avcodec_encode_audio2(AVCodecContext *avctx, AVPacket *avpkt,
4199 const AVFrame *frame, int *got_packet_ptr);
4201 #if FF_API_OLD_ENCODE_VIDEO
4203 * @deprecated use avcodec_encode_video2() instead.
4205 * Encode a video frame from pict into buf.
4206 * The input picture should be
4207 * stored using a specific format, namely avctx.pix_fmt.
4209 * @param avctx the codec context
4210 * @param[out] buf the output buffer for the bitstream of encoded frame
4211 * @param[in] buf_size the size of the output buffer in bytes
4212 * @param[in] pict the input picture to encode
4213 * @return On error a negative value is returned, on success zero or the number
4214 * of bytes used from the output buffer.
4216 attribute_deprecated
4217 int avcodec_encode_video(AVCodecContext *avctx, uint8_t *buf, int buf_size,
4218 const AVFrame *pict);
4222 * Encode a frame of video.
4224 * Takes input raw video data from frame and writes the next output packet, if
4225 * available, to avpkt. The output packet does not necessarily contain data for
4226 * the most recent frame, as encoders can delay and reorder input frames
4227 * internally as needed.
4229 * @param avctx codec context
4230 * @param avpkt output AVPacket.
4231 * The user can supply an output buffer by setting
4232 * avpkt->data and avpkt->size prior to calling the
4233 * function, but if the size of the user-provided data is not
4234 * large enough, encoding will fail. All other AVPacket fields
4235 * will be reset by the encoder using av_init_packet(). If
4236 * avpkt->data is NULL, the encoder will allocate it.
4237 * The encoder will set avpkt->size to the size of the
4238 * output packet. The returned data (if any) belongs to the
4239 * caller, he is responsible for freeing it.
4241 * If this function fails or produces no output, avpkt will be
4242 * freed using av_free_packet() (i.e. avpkt->destruct will be
4243 * called to free the user supplied buffer).
4244 * @param[in] frame AVFrame containing the raw video data to be encoded.
4245 * May be NULL when flushing an encoder that has the
4246 * CODEC_CAP_DELAY capability set.
4247 * @param[out] got_packet_ptr This field is set to 1 by libavcodec if the
4248 * output packet is non-empty, and to 0 if it is
4249 * empty. If the function returns an error, the
4250 * packet can be assumed to be invalid, and the
4251 * value of got_packet_ptr is undefined and should
4253 * @return 0 on success, negative error code on failure
4255 int avcodec_encode_video2(AVCodecContext *avctx, AVPacket *avpkt,
4256 const AVFrame *frame, int *got_packet_ptr);
4258 int avcodec_encode_subtitle(AVCodecContext *avctx, uint8_t *buf, int buf_size,
4259 const AVSubtitle *sub);
4266 #if FF_API_AVCODEC_RESAMPLE
4268 * @defgroup lavc_resample Audio resampling
4270 * @deprecated use libswresample instead
4274 struct ReSampleContext;
4275 struct AVResampleContext;
4277 typedef struct ReSampleContext ReSampleContext;
4280 * Initialize audio resampling context.
4282 * @param output_channels number of output channels
4283 * @param input_channels number of input channels
4284 * @param output_rate output sample rate
4285 * @param input_rate input sample rate
4286 * @param sample_fmt_out requested output sample format
4287 * @param sample_fmt_in input sample format
4288 * @param filter_length length of each FIR filter in the filterbank relative to the cutoff frequency
4289 * @param log2_phase_count log2 of the number of entries in the polyphase filterbank
4290 * @param linear if 1 then the used FIR filter will be linearly interpolated
4291 between the 2 closest, if 0 the closest will be used
4292 * @param cutoff cutoff frequency, 1.0 corresponds to half the output sampling rate
4293 * @return allocated ReSampleContext, NULL if error occurred
4295 attribute_deprecated
4296 ReSampleContext *av_audio_resample_init(int output_channels, int input_channels,
4297 int output_rate, int input_rate,
4298 enum AVSampleFormat sample_fmt_out,
4299 enum AVSampleFormat sample_fmt_in,
4300 int filter_length, int log2_phase_count,
4301 int linear, double cutoff);
4303 attribute_deprecated
4304 int audio_resample(ReSampleContext *s, short *output, short *input, int nb_samples);
4307 * Free resample context.
4309 * @param s a non-NULL pointer to a resample context previously
4310 * created with av_audio_resample_init()
4312 attribute_deprecated
4313 void audio_resample_close(ReSampleContext *s);
4317 * Initialize an audio resampler.
4318 * Note, if either rate is not an integer then simply scale both rates up so they are.
4319 * @param filter_length length of each FIR filter in the filterbank relative to the cutoff freq
4320 * @param log2_phase_count log2 of the number of entries in the polyphase filterbank
4321 * @param linear If 1 then the used FIR filter will be linearly interpolated
4322 between the 2 closest, if 0 the closest will be used
4323 * @param cutoff cutoff frequency, 1.0 corresponds to half the output sampling rate
4325 attribute_deprecated
4326 struct AVResampleContext *av_resample_init(int out_rate, int in_rate, int filter_length, int log2_phase_count, int linear, double cutoff);
4329 * Resample an array of samples using a previously configured context.
4330 * @param src an array of unconsumed samples
4331 * @param consumed the number of samples of src which have been consumed are returned here
4332 * @param src_size the number of unconsumed samples available
4333 * @param dst_size the amount of space in samples available in dst
4334 * @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.
4335 * @return the number of samples written in dst or -1 if an error occurred
4337 attribute_deprecated
4338 int av_resample(struct AVResampleContext *c, short *dst, short *src, int *consumed, int src_size, int dst_size, int update_ctx);
4342 * Compensate samplerate/timestamp drift. The compensation is done by changing
4343 * the resampler parameters, so no audible clicks or similar distortions occur
4344 * @param compensation_distance distance in output samples over which the compensation should be performed
4345 * @param sample_delta number of output samples which should be output less
4347 * example: av_resample_compensate(c, 10, 500)
4348 * here instead of 510 samples only 500 samples would be output
4350 * note, due to rounding the actual compensation might be slightly different,
4351 * especially if the compensation_distance is large and the in_rate used during init is small
4353 attribute_deprecated
4354 void av_resample_compensate(struct AVResampleContext *c, int sample_delta, int compensation_distance);
4355 attribute_deprecated
4356 void av_resample_close(struct AVResampleContext *c);
4364 * @addtogroup lavc_picture
4369 * Allocate memory for the pixels of a picture and setup the AVPicture
4372 * Call avpicture_free() to free it.
4374 * @param picture the picture structure to be filled in
4375 * @param pix_fmt the pixel format of the picture
4376 * @param width the width of the picture
4377 * @param height the height of the picture
4378 * @return zero if successful, a negative error code otherwise
4380 * @see av_image_alloc(), avpicture_fill()
4382 int avpicture_alloc(AVPicture *picture, enum AVPixelFormat pix_fmt, int width, int height);
4385 * Free a picture previously allocated by avpicture_alloc().
4386 * The data buffer used by the AVPicture is freed, but the AVPicture structure
4389 * @param picture the AVPicture to be freed
4391 void avpicture_free(AVPicture *picture);
4394 * Setup the picture fields based on the specified image parameters
4395 * and the provided image data buffer.
4397 * The picture fields are filled in by using the image data buffer
4398 * pointed to by ptr.
4400 * If ptr is NULL, the function will fill only the picture linesize
4401 * array and return the required size for the image buffer.
4403 * To allocate an image buffer and fill the picture data in one call,
4404 * use avpicture_alloc().
4406 * @param picture the picture to be filled in
4407 * @param ptr buffer where the image data is stored, or NULL
4408 * @param pix_fmt the pixel format of the image
4409 * @param width the width of the image in pixels
4410 * @param height the height of the image in pixels
4411 * @return the size in bytes required for src, a negative error code
4412 * in case of failure
4414 * @see av_image_fill_arrays()
4416 int avpicture_fill(AVPicture *picture, const uint8_t *ptr,
4417 enum AVPixelFormat pix_fmt, int width, int height);
4420 * Copy pixel data from an AVPicture into a buffer.
4422 * avpicture_get_size() can be used to compute the required size for
4423 * the buffer to fill.
4425 * @param src source picture with filled data
4426 * @param pix_fmt picture pixel format
4427 * @param width picture width
4428 * @param height picture height
4429 * @param dest destination buffer
4430 * @param dest_size destination buffer size in bytes
4431 * @return the number of bytes written to dest, or a negative value
4432 * (error code) on error, for example if the destination buffer is not
4435 * @see av_image_copy_to_buffer()
4437 int avpicture_layout(const AVPicture *src, enum AVPixelFormat pix_fmt,
4438 int width, int height,
4439 unsigned char *dest, int dest_size);
4442 * Calculate the size in bytes that a picture of the given width and height
4443 * would occupy if stored in the given picture format.
4445 * @param pix_fmt picture pixel format
4446 * @param width picture width
4447 * @param height picture height
4448 * @return the computed picture buffer size or a negative error code
4451 * @see av_image_get_buffer_size().
4453 int avpicture_get_size(enum AVPixelFormat pix_fmt, int width, int height);
4455 #if FF_API_DEINTERLACE
4457 * deinterlace - if not supported return -1
4459 * @deprecated - use yadif (in libavfilter) instead
4461 attribute_deprecated
4462 int avpicture_deinterlace(AVPicture *dst, const AVPicture *src,
4463 enum AVPixelFormat pix_fmt, int width, int height);
4466 * Copy image src to dst. Wraps av_image_copy().
4468 void av_picture_copy(AVPicture *dst, const AVPicture *src,
4469 enum AVPixelFormat pix_fmt, int width, int height);
4472 * Crop image top and left side.
4474 int av_picture_crop(AVPicture *dst, const AVPicture *src,
4475 enum AVPixelFormat pix_fmt, int top_band, int left_band);
4480 int av_picture_pad(AVPicture *dst, const AVPicture *src, int height, int width, enum AVPixelFormat pix_fmt,
4481 int padtop, int padbottom, int padleft, int padright, int *color);
4488 * @defgroup lavc_misc Utility functions
4491 * Miscellaneous utility functions related to both encoding and decoding
4497 * @defgroup lavc_misc_pixfmt Pixel formats
4499 * Functions for working with pixel formats.
4504 * Utility function to access log2_chroma_w log2_chroma_h from
4505 * the pixel format AVPixFmtDescriptor.
4507 * This function asserts that pix_fmt is valid. See av_pix_fmt_get_chroma_sub_sample
4508 * for one that returns a failure code and continues in case of invalid
4511 * @param[in] pix_fmt the pixel format
4512 * @param[out] h_shift store log2_chroma_w
4513 * @param[out] v_shift store log2_chroma_h
4515 * @see av_pix_fmt_get_chroma_sub_sample
4518 void avcodec_get_chroma_sub_sample(enum AVPixelFormat pix_fmt, int *h_shift, int *v_shift);
4521 * Return a value representing the fourCC code associated to the
4522 * pixel format pix_fmt, or 0 if no associated fourCC code can be
4525 unsigned int avcodec_pix_fmt_to_codec_tag(enum AVPixelFormat pix_fmt);
4527 #define FF_LOSS_RESOLUTION 0x0001 /**< loss due to resolution change */
4528 #define FF_LOSS_DEPTH 0x0002 /**< loss due to color depth change */
4529 #define FF_LOSS_COLORSPACE 0x0004 /**< loss due to color space conversion */
4530 #define FF_LOSS_ALPHA 0x0008 /**< loss of alpha bits */
4531 #define FF_LOSS_COLORQUANT 0x0010 /**< loss due to color quantization */
4532 #define FF_LOSS_CHROMA 0x0020 /**< loss of chroma (e.g. RGB to gray conversion) */
4535 * Compute what kind of losses will occur when converting from one specific
4536 * pixel format to another.
4537 * When converting from one pixel format to another, information loss may occur.
4538 * For example, when converting from RGB24 to GRAY, the color information will
4539 * be lost. Similarly, other losses occur when converting from some formats to
4540 * other formats. These losses can involve loss of chroma, but also loss of
4541 * resolution, loss of color depth, loss due to the color space conversion, loss
4542 * of the alpha bits or loss due to color quantization.
4543 * avcodec_get_fix_fmt_loss() informs you about the various types of losses
4544 * which will occur when converting from one pixel format to another.
4546 * @param[in] dst_pix_fmt destination pixel format
4547 * @param[in] src_pix_fmt source pixel format
4548 * @param[in] has_alpha Whether the source pixel format alpha channel is used.
4549 * @return Combination of flags informing you what kind of losses will occur
4550 * (maximum loss for an invalid dst_pix_fmt).
4552 int avcodec_get_pix_fmt_loss(enum AVPixelFormat dst_pix_fmt, enum AVPixelFormat src_pix_fmt,
4556 * Find the best pixel format to convert to given a certain source pixel
4557 * format. When converting from one pixel format to another, information loss
4558 * may occur. For example, when converting from RGB24 to GRAY, the color
4559 * information will be lost. Similarly, other losses occur when converting from
4560 * some formats to other formats. avcodec_find_best_pix_fmt_of_2() searches which of
4561 * the given pixel formats should be used to suffer the least amount of loss.
4562 * The pixel formats from which it chooses one, are determined by the
4563 * pix_fmt_list parameter.
4566 * @param[in] pix_fmt_list AV_PIX_FMT_NONE terminated array of pixel formats to choose from
4567 * @param[in] src_pix_fmt source pixel format
4568 * @param[in] has_alpha Whether the source pixel format alpha channel is used.
4569 * @param[out] loss_ptr Combination of flags informing you what kind of losses will occur.
4570 * @return The best pixel format to convert to or -1 if none was found.
4572 enum AVPixelFormat avcodec_find_best_pix_fmt_of_list(const enum AVPixelFormat *pix_fmt_list,
4573 enum AVPixelFormat src_pix_fmt,
4574 int has_alpha, int *loss_ptr);
4577 * Find the best pixel format to convert to given a certain source pixel
4578 * format and a selection of two destination pixel formats. When converting from
4579 * one pixel format to another, information loss may occur. For example, when converting
4580 * from RGB24 to GRAY, the color information will be lost. Similarly, other losses occur when
4581 * converting from some formats to other formats. avcodec_find_best_pix_fmt_of_2() selects which of
4582 * the given pixel formats should be used to suffer the least amount of loss.
4584 * If one of the destination formats is AV_PIX_FMT_NONE the other pixel format (if valid) will be
4588 * src_pix_fmt = AV_PIX_FMT_YUV420P;
4589 * dst_pix_fmt1= AV_PIX_FMT_RGB24;
4590 * dst_pix_fmt2= AV_PIX_FMT_GRAY8;
4591 * dst_pix_fmt3= AV_PIX_FMT_RGB8;
4592 * loss= FF_LOSS_CHROMA; // don't care about chroma loss, so chroma loss will be ignored.
4593 * dst_pix_fmt = avcodec_find_best_pix_fmt_of_2(dst_pix_fmt1, dst_pix_fmt2, src_pix_fmt, alpha, &loss);
4594 * dst_pix_fmt = avcodec_find_best_pix_fmt_of_2(dst_pix_fmt, dst_pix_fmt3, src_pix_fmt, alpha, &loss);
4597 * @param[in] dst_pix_fmt1 One of the two destination pixel formats to choose from
4598 * @param[in] dst_pix_fmt2 The other of the two destination pixel formats to choose from
4599 * @param[in] src_pix_fmt Source pixel format
4600 * @param[in] has_alpha Whether the source pixel format alpha channel is used.
4601 * @param[in, out] loss_ptr Combination of loss flags. In: selects which of the losses to ignore, i.e.
4602 * NULL or value of zero means we care about all losses. Out: the loss
4603 * that occurs when converting from src to selected dst pixel format.
4604 * @return The best pixel format to convert to or -1 if none was found.
4606 enum AVPixelFormat avcodec_find_best_pix_fmt_of_2(enum AVPixelFormat dst_pix_fmt1, enum AVPixelFormat dst_pix_fmt2,
4607 enum AVPixelFormat src_pix_fmt, int has_alpha, int *loss_ptr);
4609 attribute_deprecated
4610 #if AV_HAVE_INCOMPATIBLE_LIBAV_ABI
4611 enum AVPixelFormat avcodec_find_best_pix_fmt2(const enum AVPixelFormat *pix_fmt_list,
4612 enum AVPixelFormat src_pix_fmt,
4613 int has_alpha, int *loss_ptr);
4615 enum AVPixelFormat avcodec_find_best_pix_fmt2(enum AVPixelFormat dst_pix_fmt1, enum AVPixelFormat dst_pix_fmt2,
4616 enum AVPixelFormat src_pix_fmt, int has_alpha, int *loss_ptr);
4620 enum AVPixelFormat avcodec_default_get_format(struct AVCodecContext *s, const enum AVPixelFormat * fmt);
4626 void avcodec_set_dimensions(AVCodecContext *s, int width, int height);
4629 * Put a string representing the codec tag codec_tag in buf.
4631 * @param buf_size size in bytes of buf
4632 * @return the length of the string that would have been generated if
4633 * enough space had been available, excluding the trailing null
4635 size_t av_get_codec_tag_string(char *buf, size_t buf_size, unsigned int codec_tag);
4637 void avcodec_string(char *buf, int buf_size, AVCodecContext *enc, int encode);
4640 * Return a name for the specified profile, if available.
4642 * @param codec the codec that is searched for the given profile
4643 * @param profile the profile value for which a name is requested
4644 * @return A name for the profile if found, NULL otherwise.
4646 const char *av_get_profile_name(const AVCodec *codec, int profile);
4648 int avcodec_default_execute(AVCodecContext *c, int (*func)(AVCodecContext *c2, void *arg2),void *arg, int *ret, int count, int size);
4649 int avcodec_default_execute2(AVCodecContext *c, int (*func)(AVCodecContext *c2, void *arg2, int, int),void *arg, int *ret, int count);
4650 //FIXME func typedef
4653 * Fill AVFrame audio data and linesize pointers.
4655 * The buffer buf must be a preallocated buffer with a size big enough
4656 * to contain the specified samples amount. The filled AVFrame data
4657 * pointers will point to this buffer.
4659 * AVFrame extended_data channel pointers are allocated if necessary for
4662 * @param frame the AVFrame
4663 * frame->nb_samples must be set prior to calling the
4664 * function. This function fills in frame->data,
4665 * frame->extended_data, frame->linesize[0].
4666 * @param nb_channels channel count
4667 * @param sample_fmt sample format
4668 * @param buf buffer to use for frame data
4669 * @param buf_size size of buffer
4670 * @param align plane size sample alignment (0 = default)
4671 * @return >=0 on success, negative error code on failure
4672 * @todo return the size in bytes required to store the samples in
4673 * case of success, at the next libavutil bump
4675 int avcodec_fill_audio_frame(AVFrame *frame, int nb_channels,
4676 enum AVSampleFormat sample_fmt, const uint8_t *buf,
4677 int buf_size, int align);
4680 * Flush buffers, should be called when seeking or when switching to a different stream.
4682 void avcodec_flush_buffers(AVCodecContext *avctx);
4685 * Return codec bits per sample.
4687 * @param[in] codec_id the codec
4688 * @return Number of bits per sample or zero if unknown for the given codec.
4690 int av_get_bits_per_sample(enum AVCodecID codec_id);
4693 * Return the PCM codec associated with a sample format.
4694 * @param be endianness, 0 for little, 1 for big,
4695 * -1 (or anything else) for native
4696 * @return AV_CODEC_ID_PCM_* or AV_CODEC_ID_NONE
4698 enum AVCodecID av_get_pcm_codec(enum AVSampleFormat fmt, int be);
4701 * Return codec bits per sample.
4702 * Only return non-zero if the bits per sample is exactly correct, not an
4705 * @param[in] codec_id the codec
4706 * @return Number of bits per sample or zero if unknown for the given codec.
4708 int av_get_exact_bits_per_sample(enum AVCodecID codec_id);
4711 * Return audio frame duration.
4713 * @param avctx codec context
4714 * @param frame_bytes size of the frame, or 0 if unknown
4715 * @return frame duration, in samples, if known. 0 if not able to
4718 int av_get_audio_frame_duration(AVCodecContext *avctx, int frame_bytes);
4721 typedef struct AVBitStreamFilterContext {
4723 struct AVBitStreamFilter *filter;
4724 AVCodecParserContext *parser;
4725 struct AVBitStreamFilterContext *next;
4726 } AVBitStreamFilterContext;
4729 typedef struct AVBitStreamFilter {
4732 int (*filter)(AVBitStreamFilterContext *bsfc,
4733 AVCodecContext *avctx, const char *args,
4734 uint8_t **poutbuf, int *poutbuf_size,
4735 const uint8_t *buf, int buf_size, int keyframe);
4736 void (*close)(AVBitStreamFilterContext *bsfc);
4737 struct AVBitStreamFilter *next;
4738 } AVBitStreamFilter;
4741 * Register a bitstream filter.
4743 * The filter will be accessible to the application code through
4744 * av_bitstream_filter_next() or can be directly initialized with
4745 * av_bitstream_filter_init().
4747 * @see avcodec_register_all()
4749 void av_register_bitstream_filter(AVBitStreamFilter *bsf);
4752 * Create and initialize a bitstream filter context given a bitstream
4755 * The returned context must be freed with av_bitstream_filter_close().
4757 * @param name the name of the bitstream filter
4758 * @return a bitstream filter context if a matching filter was found
4759 * and successfully initialized, NULL otherwise
4761 AVBitStreamFilterContext *av_bitstream_filter_init(const char *name);
4766 * This function filters the buffer buf with size buf_size, and places the
4767 * filtered buffer in the buffer pointed to by poutbuf.
4769 * The output buffer must be freed by the caller.
4771 * @param bsfc bitstream filter context created by av_bitstream_filter_init()
4772 * @param avctx AVCodecContext accessed by the filter, may be NULL.
4773 * If specified, this must point to the encoder context of the
4774 * output stream the packet is sent to.
4775 * @param args arguments which specify the filter configuration, may be NULL
4776 * @param poutbuf pointer which is updated to point to the filtered buffer
4777 * @param poutbuf_size pointer which is updated to the filtered buffer size in bytes
4778 * @param buf buffer containing the data to filter
4779 * @param buf_size size in bytes of buf
4780 * @param keyframe set to non-zero if the buffer to filter corresponds to a key-frame packet data
4781 * @return >= 0 in case of success, or a negative error code in case of failure
4783 * If the return value is positive, an output buffer is allocated and
4784 * is availble in *poutbuf, and is distinct from the input buffer.
4786 * If the return value is 0, the output buffer is not allocated and
4787 * should be considered identical to the input buffer, or in case
4788 * *poutbuf was set it points to the input buffer (not necessarily to
4789 * its starting address).
4791 int av_bitstream_filter_filter(AVBitStreamFilterContext *bsfc,
4792 AVCodecContext *avctx, const char *args,
4793 uint8_t **poutbuf, int *poutbuf_size,
4794 const uint8_t *buf, int buf_size, int keyframe);
4797 * Release bitstream filter context.
4799 * @param bsf the bitstream filter context created with
4800 * av_bitstream_filter_init(), can be NULL
4802 void av_bitstream_filter_close(AVBitStreamFilterContext *bsf);
4805 * If f is NULL, return the first registered bitstream filter,
4806 * if f is non-NULL, return the next registered bitstream filter
4807 * after f, or NULL if f is the last one.
4809 * This function can be used to iterate over all registered bitstream
4812 AVBitStreamFilter *av_bitstream_filter_next(AVBitStreamFilter *f);
4817 * Reallocate the given block if it is not large enough, otherwise do nothing.
4821 void *av_fast_realloc(void *ptr, unsigned int *size, size_t min_size);
4824 * Allocate a buffer, reusing the given one if large enough.
4826 * Contrary to av_fast_realloc the current buffer contents might not be
4827 * preserved and on error the old buffer is freed, thus no special
4828 * handling to avoid memleaks is necessary.
4830 * @param ptr pointer to pointer to already allocated buffer, overwritten with pointer to new buffer
4831 * @param size size of the buffer *ptr points to
4832 * @param min_size minimum size of *ptr buffer after returning, *ptr will be NULL and
4833 * *size 0 if an error occurred.
4835 void av_fast_malloc(void *ptr, unsigned int *size, size_t min_size);
4838 * Same behaviour av_fast_malloc but the buffer has additional
4839 * FF_INPUT_BUFFER_PADDING_SIZE at the end which will always be 0.
4841 * In addition the whole buffer will initially and after resizes
4842 * be 0-initialized so that no uninitialized data will ever appear.
4844 void av_fast_padded_malloc(void *ptr, unsigned int *size, size_t min_size);
4847 * Same behaviour av_fast_padded_malloc except that buffer will always
4848 * be 0-initialized after call.
4850 void av_fast_padded_mallocz(void *ptr, unsigned int *size, size_t min_size);
4853 * Encode extradata length to a buffer. Used by xiph codecs.
4855 * @param s buffer to write to; must be at least (v/255+1) bytes long
4856 * @param v size of extradata in bytes
4857 * @return number of bytes written to the buffer.
4859 unsigned int av_xiphlacing(unsigned char *s, unsigned int v);
4861 #if FF_API_MISSING_SAMPLE
4863 * Log a generic warning message about a missing feature. This function is
4864 * intended to be used internally by FFmpeg (libavcodec, libavformat, etc.)
4865 * only, and would normally not be used by applications.
4866 * @param[in] avc a pointer to an arbitrary struct of which the first field is
4867 * a pointer to an AVClass struct
4868 * @param[in] feature string containing the name of the missing feature
4869 * @param[in] want_sample indicates if samples are wanted which exhibit this feature.
4870 * If want_sample is non-zero, additional verbage will be added to the log
4871 * message which tells the user how to report samples to the development
4873 * @deprecated Use avpriv_report_missing_feature() instead.
4875 attribute_deprecated
4876 void av_log_missing_feature(void *avc, const char *feature, int want_sample);
4879 * Log a generic warning message asking for a sample. This function is
4880 * intended to be used internally by FFmpeg (libavcodec, libavformat, etc.)
4881 * only, and would normally not be used by applications.
4882 * @param[in] avc a pointer to an arbitrary struct of which the first field is
4883 * a pointer to an AVClass struct
4884 * @param[in] msg string containing an optional message, or NULL if no message
4885 * @deprecated Use avpriv_request_sample() instead.
4887 attribute_deprecated
4888 void av_log_ask_for_sample(void *avc, const char *msg, ...) av_printf_format(2, 3);
4889 #endif /* FF_API_MISSING_SAMPLE */
4892 * Register the hardware accelerator hwaccel.
4894 void av_register_hwaccel(AVHWAccel *hwaccel);
4897 * If hwaccel is NULL, returns the first registered hardware accelerator,
4898 * if hwaccel is non-NULL, returns the next registered hardware accelerator
4899 * after hwaccel, or NULL if hwaccel is the last one.
4901 AVHWAccel *av_hwaccel_next(AVHWAccel *hwaccel);
4905 * Lock operation used by lockmgr
4908 AV_LOCK_CREATE, ///< Create a mutex
4909 AV_LOCK_OBTAIN, ///< Lock the mutex
4910 AV_LOCK_RELEASE, ///< Unlock the mutex
4911 AV_LOCK_DESTROY, ///< Free mutex resources
4915 * Register a user provided lock manager supporting the operations
4916 * specified by AVLockOp. mutex points to a (void *) where the
4917 * lockmgr should store/get a pointer to a user allocated mutex. It's
4918 * NULL upon AV_LOCK_CREATE and != NULL for all other ops.
4920 * @param cb User defined callback. Note: FFmpeg may invoke calls to this
4921 * callback during the call to av_lockmgr_register().
4922 * Thus, the application must be prepared to handle that.
4923 * If cb is set to NULL the lockmgr will be unregistered.
4924 * Also note that during unregistration the previously registered
4925 * lockmgr callback may also be invoked.
4927 int av_lockmgr_register(int (*cb)(void **mutex, enum AVLockOp op));
4930 * Get the type of the given codec.
4932 enum AVMediaType avcodec_get_type(enum AVCodecID codec_id);
4935 * Get the name of a codec.
4936 * @return a static string identifying the codec; never NULL
4938 const char *avcodec_get_name(enum AVCodecID id);
4941 * @return a positive value if s is open (i.e. avcodec_open2() was called on it
4942 * with no corresponding avcodec_close()), 0 otherwise.
4944 int avcodec_is_open(AVCodecContext *s);
4947 * @return a non-zero number if codec is an encoder, zero otherwise
4949 int av_codec_is_encoder(const AVCodec *codec);
4952 * @return a non-zero number if codec is a decoder, zero otherwise
4954 int av_codec_is_decoder(const AVCodec *codec);
4957 * @return descriptor for given codec ID or NULL if no descriptor exists.
4959 const AVCodecDescriptor *avcodec_descriptor_get(enum AVCodecID id);
4962 * Iterate over all codec descriptors known to libavcodec.
4964 * @param prev previous descriptor. NULL to get the first descriptor.
4966 * @return next descriptor or NULL after the last descriptor
4968 const AVCodecDescriptor *avcodec_descriptor_next(const AVCodecDescriptor *prev);
4971 * @return codec descriptor with the given name or NULL if no such descriptor
4974 const AVCodecDescriptor *avcodec_descriptor_get_by_name(const char *name);
4980 #endif /* AVCODEC_AVCODEC_H */