2 * copyright (c) 2001 Fabrice Bellard
4 * This file is part of FFmpeg.
6 * FFmpeg is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
11 * FFmpeg is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with FFmpeg; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21 #ifndef AVCODEC_AVCODEC_H
22 #define AVCODEC_AVCODEC_H
30 #include "libavutil/samplefmt.h"
31 #include "libavutil/avutil.h"
32 #include "libavutil/cpu.h"
33 #include "libavutil/dict.h"
34 #include "libavutil/log.h"
35 #include "libavutil/pixfmt.h"
36 #include "libavutil/rational.h"
38 #include "libavcodec/version.h"
40 * @defgroup libavc Encoding/Decoding Library
43 * @defgroup lavc_decoding Decoding
47 * @defgroup lavc_encoding Encoding
51 * @defgroup lavc_codec Codecs
53 * @defgroup lavc_codec_native Native Codecs
56 * @defgroup lavc_codec_wrappers External library wrappers
59 * @defgroup lavc_codec_hwaccel Hardware Accelerators bridge
63 * @defgroup lavc_internal Internal
72 * Identify the syntax and semantics of the bitstream.
73 * The principle is roughly:
74 * Two decoders with the same ID can decode the same streams.
75 * Two encoders with the same ID can encode compatible streams.
76 * There may be slight deviations from the principle due to implementation
79 * If you add a codec ID to this list, add it so that
80 * 1. no value of a existing codec ID changes (that would break ABI),
81 * 2. Give it a value which when taken as ASCII is recognized uniquely by a human as this specific codec.
82 * This ensures that 2 forks can independantly add CodecIDs without producing conflicts.
89 CODEC_ID_MPEG2VIDEO, ///< preferred ID for MPEG-1/2 video decoding
90 CODEC_ID_MPEG2VIDEO_XVMC,
127 CODEC_ID_INTERPLAY_VIDEO,
139 CODEC_ID_TRUEMOTION1,
166 CODEC_ID_TRUEMOTION2,
183 CODEC_ID_DSICINVIDEO,
184 CODEC_ID_TIERTEXSEQVIDEO,
187 #if LIBAVCODEC_VERSION_MAJOR == 53
195 CODEC_ID_BETHSOFTVID,
207 #if LIBAVCODEC_VERSION_MAJOR == 53
215 CODEC_ID_MOTIONPIXELS,
233 CODEC_ID_IFF_BYTERUN1,
249 #if LIBAVCODEC_VERSION_MAJOR == 53
250 CODEC_ID_G723_1_DEPRECATED,
251 CODEC_ID_G729_DEPRECATED,
253 CODEC_ID_UTVIDEO_DEPRECATED,
258 CODEC_ID_Y41P = MKBETAG('Y','4','1','P'),
259 CODEC_ID_UTVIDEO = 0x800,
260 CODEC_ID_ESCAPE130 = MKBETAG('E','1','3','0'),
261 CODEC_ID_AVRP = MKBETAG('A','V','R','P'),
263 CODEC_ID_G2M = MKBETAG( 0 ,'G','2','M'),
264 CODEC_ID_V308 = MKBETAG('V','3','0','8'),
265 CODEC_ID_YUV4 = MKBETAG('Y','U','V','4'),
267 /* various PCM "codecs" */
268 CODEC_ID_FIRST_AUDIO = 0x10000, ///< A dummy id pointing at the start of audio codecs
269 CODEC_ID_PCM_S16LE = 0x10000,
285 CODEC_ID_PCM_S24DAUD,
287 CODEC_ID_PCM_S16LE_PLANAR,
296 CODEC_ID_PCM_S8_PLANAR,
298 /* various ADPCM codecs */
299 CODEC_ID_ADPCM_IMA_QT = 0x11000,
300 CODEC_ID_ADPCM_IMA_WAV,
301 CODEC_ID_ADPCM_IMA_DK3,
302 CODEC_ID_ADPCM_IMA_DK4,
303 CODEC_ID_ADPCM_IMA_WS,
304 CODEC_ID_ADPCM_IMA_SMJPEG,
313 CODEC_ID_ADPCM_YAMAHA,
314 CODEC_ID_ADPCM_SBPRO_4,
315 CODEC_ID_ADPCM_SBPRO_3,
316 CODEC_ID_ADPCM_SBPRO_2,
318 CODEC_ID_ADPCM_IMA_AMV,
319 CODEC_ID_ADPCM_EA_R1,
320 CODEC_ID_ADPCM_EA_R3,
321 CODEC_ID_ADPCM_EA_R2,
322 CODEC_ID_ADPCM_IMA_EA_SEAD,
323 CODEC_ID_ADPCM_IMA_EA_EACS,
324 CODEC_ID_ADPCM_EA_XAS,
325 CODEC_ID_ADPCM_EA_MAXIS_XA,
326 CODEC_ID_ADPCM_IMA_ISS,
330 CODEC_ID_AMR_NB = 0x12000,
333 /* RealAudio codecs*/
334 CODEC_ID_RA_144 = 0x13000,
337 /* various DPCM codecs */
338 CODEC_ID_ROQ_DPCM = 0x14000,
339 CODEC_ID_INTERPLAY_DPCM,
344 CODEC_ID_MP2 = 0x15000,
345 CODEC_ID_MP3, ///< preferred ID for decoding MPEG audio layer 1, 2 or 3
356 #if LIBAVCODEC_VERSION_MAJOR == 53
365 CODEC_ID_WESTWOOD_SND1,
366 CODEC_ID_GSM, ///< as in Berlin toast format
374 CODEC_ID_DSICINAUDIO,
378 CODEC_ID_GSM_MS, /* as found in WAV */
387 CODEC_ID_WMALOSSLESS,
396 CODEC_ID_BINKAUDIO_RDFT,
397 CODEC_ID_BINKAUDIO_DCT,
401 #if LIBAVCODEC_VERSION_MAJOR > 53
402 CODEC_ID_G723_1_DEPRECATED,
403 CODEC_ID_G729_DEPRECATED,
408 CODEC_ID_G729 = 0x15800,
409 CODEC_ID_G723_1= 0x15801,
410 CODEC_ID_FFWAVESYNTH = MKBETAG('F','F','W','S'),
411 CODEC_ID_8SVX_RAW = MKBETAG('8','S','V','X'),
413 /* subtitle codecs */
414 CODEC_ID_FIRST_SUBTITLE = 0x17000, ///< A dummy ID pointing at the start of subtitle codecs.
415 CODEC_ID_DVD_SUBTITLE = 0x17000,
416 CODEC_ID_DVB_SUBTITLE,
417 CODEC_ID_TEXT, ///< raw UTF-8 text
421 CODEC_ID_HDMV_PGS_SUBTITLE,
422 CODEC_ID_DVB_TELETEXT,
424 CODEC_ID_MICRODVD = MKBETAG('m','D','V','D'),
426 /* other specific kind of codecs (generally used for attachments) */
427 CODEC_ID_FIRST_UNKNOWN = 0x18000, ///< A dummy ID pointing at the start of various fake codecs.
428 CODEC_ID_TTF = 0x18000,
429 CODEC_ID_BINTEXT = MKBETAG('B','T','X','T'),
430 CODEC_ID_XBIN = MKBETAG('X','B','I','N'),
431 CODEC_ID_IDF = MKBETAG( 0 ,'I','D','F'),
433 CODEC_ID_PROBE = 0x19000, ///< codec_id is not known (like CODEC_ID_NONE) but lavf should attempt to identify it
435 CODEC_ID_MPEG2TS = 0x20000, /**< _FAKE_ codec to indicate a raw MPEG-2 TS
436 * stream (only used by libavformat) */
437 CODEC_ID_MPEG4SYSTEMS = 0x20001, /**< _FAKE_ codec to indicate a MPEG-4 Systems
438 * stream (only used by libavformat) */
439 CODEC_ID_FFMETADATA = 0x21000, ///< Dummy codec for streams containing only metadata information.
442 #if FF_API_OLD_SAMPLE_FMT
443 #define SampleFormat AVSampleFormat
445 #define SAMPLE_FMT_NONE AV_SAMPLE_FMT_NONE
446 #define SAMPLE_FMT_U8 AV_SAMPLE_FMT_U8
447 #define SAMPLE_FMT_S16 AV_SAMPLE_FMT_S16
448 #define SAMPLE_FMT_S32 AV_SAMPLE_FMT_S32
449 #define SAMPLE_FMT_FLT AV_SAMPLE_FMT_FLT
450 #define SAMPLE_FMT_DBL AV_SAMPLE_FMT_DBL
451 #define SAMPLE_FMT_NB AV_SAMPLE_FMT_NB
454 #if FF_API_OLD_AUDIOCONVERT
455 #include "libavutil/audioconvert.h"
457 /* Audio channel masks */
458 #define CH_FRONT_LEFT AV_CH_FRONT_LEFT
459 #define CH_FRONT_RIGHT AV_CH_FRONT_RIGHT
460 #define CH_FRONT_CENTER AV_CH_FRONT_CENTER
461 #define CH_LOW_FREQUENCY AV_CH_LOW_FREQUENCY
462 #define CH_BACK_LEFT AV_CH_BACK_LEFT
463 #define CH_BACK_RIGHT AV_CH_BACK_RIGHT
464 #define CH_FRONT_LEFT_OF_CENTER AV_CH_FRONT_LEFT_OF_CENTER
465 #define CH_FRONT_RIGHT_OF_CENTER AV_CH_FRONT_RIGHT_OF_CENTER
466 #define CH_BACK_CENTER AV_CH_BACK_CENTER
467 #define CH_SIDE_LEFT AV_CH_SIDE_LEFT
468 #define CH_SIDE_RIGHT AV_CH_SIDE_RIGHT
469 #define CH_TOP_CENTER AV_CH_TOP_CENTER
470 #define CH_TOP_FRONT_LEFT AV_CH_TOP_FRONT_LEFT
471 #define CH_TOP_FRONT_CENTER AV_CH_TOP_FRONT_CENTER
472 #define CH_TOP_FRONT_RIGHT AV_CH_TOP_FRONT_RIGHT
473 #define CH_TOP_BACK_LEFT AV_CH_TOP_BACK_LEFT
474 #define CH_TOP_BACK_CENTER AV_CH_TOP_BACK_CENTER
475 #define CH_TOP_BACK_RIGHT AV_CH_TOP_BACK_RIGHT
476 #define CH_STEREO_LEFT AV_CH_STEREO_LEFT
477 #define CH_STEREO_RIGHT AV_CH_STEREO_RIGHT
479 /** Channel mask value used for AVCodecContext.request_channel_layout
480 to indicate that the user requests the channel order of the decoder output
481 to be the native codec channel order. */
482 #define CH_LAYOUT_NATIVE AV_CH_LAYOUT_NATIVE
484 /* Audio channel convenience macros */
485 #define CH_LAYOUT_MONO AV_CH_LAYOUT_MONO
486 #define CH_LAYOUT_STEREO AV_CH_LAYOUT_STEREO
487 #define CH_LAYOUT_2_1 AV_CH_LAYOUT_2_1
488 #define CH_LAYOUT_SURROUND AV_CH_LAYOUT_SURROUND
489 #define CH_LAYOUT_4POINT0 AV_CH_LAYOUT_4POINT0
490 #define CH_LAYOUT_2_2 AV_CH_LAYOUT_2_2
491 #define CH_LAYOUT_QUAD AV_CH_LAYOUT_QUAD
492 #define CH_LAYOUT_5POINT0 AV_CH_LAYOUT_5POINT0
493 #define CH_LAYOUT_5POINT1 AV_CH_LAYOUT_5POINT1
494 #define CH_LAYOUT_5POINT0_BACK AV_CH_LAYOUT_5POINT0_BACK
495 #define CH_LAYOUT_5POINT1_BACK AV_CH_LAYOUT_5POINT1_BACK
496 #define CH_LAYOUT_7POINT0 AV_CH_LAYOUT_7POINT0
497 #define CH_LAYOUT_7POINT1 AV_CH_LAYOUT_7POINT1
498 #define CH_LAYOUT_7POINT1_WIDE AV_CH_LAYOUT_7POINT1_WIDE
499 #define CH_LAYOUT_STEREO_DOWNMIX AV_CH_LAYOUT_STEREO_DOWNMIX
502 #if FF_API_OLD_DECODE_AUDIO
504 #define AVCODEC_MAX_AUDIO_FRAME_SIZE 192000 // 1 second of 48khz 32bit audio
508 * Required number of additionally allocated bytes at the end of the input bitstream for decoding.
509 * This is mainly needed because some optimized bitstream readers read
510 * 32 or 64 bit at once and could read over the end.<br>
511 * Note: If the first 23 bits of the additional bytes are not 0, then damaged
512 * MPEG bitstreams could cause overread and segfault.
514 #define FF_INPUT_BUFFER_PADDING_SIZE 16
517 * minimum encoding buffer size
518 * Used to avoid some checks during header writing.
520 #define FF_MIN_BUFFER_SIZE 16384
524 * motion estimation type.
527 ME_ZERO = 1, ///< no search, that is use 0,0 vector whenever one is needed
531 ME_EPZS, ///< enhanced predictive zonal search
532 ME_X1, ///< reserved for experiments
533 ME_HEX, ///< hexagon based search
534 ME_UMH, ///< uneven multi-hexagon search
535 ME_ITER, ///< iterative search
536 ME_TESA, ///< transformed exhaustive search algorithm
540 /* We leave some space between them for extensions (drop some
541 * keyframes for intra-only or drop just some bidir frames). */
542 AVDISCARD_NONE =-16, ///< discard nothing
543 AVDISCARD_DEFAULT= 0, ///< discard useless packets like 0 size packets in avi
544 AVDISCARD_NONREF = 8, ///< discard all non reference
545 AVDISCARD_BIDIR = 16, ///< discard all bidirectional frames
546 AVDISCARD_NONKEY = 32, ///< discard all frames except keyframes
547 AVDISCARD_ALL = 48, ///< discard all
550 enum AVColorPrimaries{
551 AVCOL_PRI_BT709 =1, ///< also ITU-R BT1361 / IEC 61966-2-4 / SMPTE RP177 Annex B
552 AVCOL_PRI_UNSPECIFIED=2,
554 AVCOL_PRI_BT470BG =5, ///< also ITU-R BT601-6 625 / ITU-R BT1358 625 / ITU-R BT1700 625 PAL & SECAM
555 AVCOL_PRI_SMPTE170M =6, ///< also ITU-R BT601-6 525 / ITU-R BT1358 525 / ITU-R BT1700 NTSC
556 AVCOL_PRI_SMPTE240M =7, ///< functionally identical to above
558 AVCOL_PRI_NB , ///< Not part of ABI
561 enum AVColorTransferCharacteristic{
562 AVCOL_TRC_BT709 =1, ///< also ITU-R BT1361
563 AVCOL_TRC_UNSPECIFIED=2,
564 AVCOL_TRC_GAMMA22 =4, ///< also ITU-R BT470M / ITU-R BT1700 625 PAL & SECAM
565 AVCOL_TRC_GAMMA28 =5, ///< also ITU-R BT470BG
566 AVCOL_TRC_SMPTE240M =7,
567 AVCOL_TRC_NB , ///< Not part of ABI
572 AVCOL_SPC_BT709 =1, ///< also ITU-R BT1361 / IEC 61966-2-4 xvYCC709 / SMPTE RP177 Annex B
573 AVCOL_SPC_UNSPECIFIED=2,
575 AVCOL_SPC_BT470BG =5, ///< also ITU-R BT601-6 625 / ITU-R BT1358 625 / ITU-R BT1700 625 PAL & SECAM / IEC 61966-2-4 xvYCC601
576 AVCOL_SPC_SMPTE170M =6, ///< also ITU-R BT601-6 525 / ITU-R BT1358 525 / ITU-R BT1700 NTSC / functionally identical to above
577 AVCOL_SPC_SMPTE240M =7,
579 AVCOL_SPC_NB , ///< Not part of ABI
583 AVCOL_RANGE_UNSPECIFIED=0,
584 AVCOL_RANGE_MPEG =1, ///< the normal 219*2^(n-8) "MPEG" YUV ranges
585 AVCOL_RANGE_JPEG =2, ///< the normal 2^n-1 "JPEG" YUV ranges
586 AVCOL_RANGE_NB , ///< Not part of ABI
590 * X X 3 4 X X are luma samples,
591 * 1 2 1-6 are possible chroma positions
592 * X X 5 6 X 0 is undefined/unknown position
594 enum AVChromaLocation{
595 AVCHROMA_LOC_UNSPECIFIED=0,
596 AVCHROMA_LOC_LEFT =1, ///< mpeg2/4, h264 default
597 AVCHROMA_LOC_CENTER =2, ///< mpeg1, jpeg, h263
598 AVCHROMA_LOC_TOPLEFT =3, ///< DV
600 AVCHROMA_LOC_BOTTOMLEFT =5,
601 AVCHROMA_LOC_BOTTOM =6,
602 AVCHROMA_LOC_NB , ///< Not part of ABI
605 #if FF_API_FLAC_GLOBAL_OPTS
610 AV_LPC_TYPE_DEFAULT = -1, ///< use the codec default LPC type
611 AV_LPC_TYPE_NONE = 0, ///< do not use LPC prediction or use all zero coefficients
612 AV_LPC_TYPE_FIXED = 1, ///< fixed LPC coefficients
613 AV_LPC_TYPE_LEVINSON = 2, ///< Levinson-Durbin recursion
614 AV_LPC_TYPE_CHOLESKY = 3, ///< Cholesky factorization
615 AV_LPC_TYPE_NB , ///< Not part of ABI
619 enum AVAudioServiceType {
620 AV_AUDIO_SERVICE_TYPE_MAIN = 0,
621 AV_AUDIO_SERVICE_TYPE_EFFECTS = 1,
622 AV_AUDIO_SERVICE_TYPE_VISUALLY_IMPAIRED = 2,
623 AV_AUDIO_SERVICE_TYPE_HEARING_IMPAIRED = 3,
624 AV_AUDIO_SERVICE_TYPE_DIALOGUE = 4,
625 AV_AUDIO_SERVICE_TYPE_COMMENTARY = 5,
626 AV_AUDIO_SERVICE_TYPE_EMERGENCY = 6,
627 AV_AUDIO_SERVICE_TYPE_VOICE_OVER = 7,
628 AV_AUDIO_SERVICE_TYPE_KARAOKE = 8,
629 AV_AUDIO_SERVICE_TYPE_NB , ///< Not part of ABI
632 typedef struct RcOverride{
635 int qscale; // If this is 0 then quality_factor will be used instead.
636 float quality_factor;
639 #define FF_MAX_B_FRAMES 16
642 These flags can be passed in AVCodecContext.flags before initialization.
643 Note: Not everything is supported yet.
646 #define CODEC_FLAG_QSCALE 0x0002 ///< Use fixed qscale.
647 #define CODEC_FLAG_4MV 0x0004 ///< 4 MV per MB allowed / advanced prediction for H.263.
648 #define CODEC_FLAG_QPEL 0x0010 ///< Use qpel MC.
649 #define CODEC_FLAG_GMC 0x0020 ///< Use GMC.
650 #define CODEC_FLAG_MV0 0x0040 ///< Always try a MB with MV=<0,0>.
652 * The parent program guarantees that the input for B-frames containing
653 * streams is not written to for at least s->max_b_frames+1 frames, if
654 * this is not set the input will be copied.
656 #define CODEC_FLAG_INPUT_PRESERVED 0x0100
657 #define CODEC_FLAG_PASS1 0x0200 ///< Use internal 2pass ratecontrol in first pass mode.
658 #define CODEC_FLAG_PASS2 0x0400 ///< Use internal 2pass ratecontrol in second pass mode.
659 #define CODEC_FLAG_GRAY 0x2000 ///< Only decode/encode grayscale.
660 #define CODEC_FLAG_EMU_EDGE 0x4000 ///< Don't draw edges.
661 #define CODEC_FLAG_PSNR 0x8000 ///< error[?] variables will be set during encoding.
662 #define CODEC_FLAG_TRUNCATED 0x00010000 /** Input bitstream might be truncated at a random
663 location instead of only at frame boundaries. */
664 #define CODEC_FLAG_NORMALIZE_AQP 0x00020000 ///< Normalize adaptive quantization.
665 #define CODEC_FLAG_INTERLACED_DCT 0x00040000 ///< Use interlaced DCT.
666 #define CODEC_FLAG_LOW_DELAY 0x00080000 ///< Force low delay.
667 #define CODEC_FLAG_GLOBAL_HEADER 0x00400000 ///< Place global headers in extradata instead of every keyframe.
668 #define CODEC_FLAG_BITEXACT 0x00800000 ///< Use only bitexact stuff (except (I)DCT).
669 /* Fx : Flag for h263+ extra options */
670 #define CODEC_FLAG_AC_PRED 0x01000000 ///< H.263 advanced intra coding / MPEG-4 AC prediction
671 #define CODEC_FLAG_CBP_RD 0x04000000 ///< Use rate distortion optimization for cbp.
672 #define CODEC_FLAG_QP_RD 0x08000000 ///< Use rate distortion optimization for qp selectioon.
673 #define CODEC_FLAG_LOOP_FILTER 0x00000800 ///< loop filter
674 #define CODEC_FLAG_INTERLACED_ME 0x20000000 ///< interlaced motion estimation
675 #define CODEC_FLAG_CLOSED_GOP 0x80000000
676 #define CODEC_FLAG2_FAST 0x00000001 ///< Allow non spec compliant speedup tricks.
677 #define CODEC_FLAG2_STRICT_GOP 0x00000002 ///< Strictly enforce GOP size.
678 #define CODEC_FLAG2_NO_OUTPUT 0x00000004 ///< Skip bitstream encoding.
679 #define CODEC_FLAG2_LOCAL_HEADER 0x00000008 ///< Place global headers at every keyframe instead of in extradata.
680 #define CODEC_FLAG2_SKIP_RD 0x00004000 ///< RD optimal MB level residual skipping
681 #define CODEC_FLAG2_CHUNKS 0x00008000 ///< Input bitstream might be truncated at a packet boundaries instead of only at frame boundaries.
682 #define CODEC_FLAG2_SHOW_ALL 0x00400000 ///< Show all frames before the first keyframe
684 * @defgroup deprecated_flags Deprecated codec flags
685 * Use corresponding private codec options instead.
688 #if FF_API_MPEGVIDEO_GLOBAL_OPTS
689 #define CODEC_FLAG_OBMC 0x00000001 ///< OBMC
690 #define CODEC_FLAG_H263P_AIV 0x00000008 ///< H.263 alternative inter VLC
691 #define CODEC_FLAG_PART 0x0080 ///< Use data partitioning.
692 #define CODEC_FLAG_ALT_SCAN 0x00100000 ///< Use alternate scan.
693 #define CODEC_FLAG_H263P_UMV 0x02000000 ///< unlimited motion vector
694 #define CODEC_FLAG_H263P_SLICE_STRUCT 0x10000000
695 #define CODEC_FLAG_SVCD_SCAN_OFFSET 0x40000000 ///< Will reserve space for SVCD scan offset user data.
696 #define CODEC_FLAG2_INTRA_VLC 0x00000800 ///< Use MPEG-2 intra VLC table.
697 #define CODEC_FLAG2_DROP_FRAME_TIMECODE 0x00002000 ///< timecode is in drop frame format.
698 #define CODEC_FLAG2_NON_LINEAR_QUANT 0x00010000 ///< Use MPEG-2 nonlinear quantizer.
700 #if FF_API_MJPEG_GLOBAL_OPTS
701 #define CODEC_FLAG_EXTERN_HUFF 0x1000 ///< Use external Huffman table (for MJPEG).
703 #if FF_API_X264_GLOBAL_OPTS
704 #define CODEC_FLAG2_BPYRAMID 0x00000010 ///< H.264 allow B-frames to be used as references.
705 #define CODEC_FLAG2_WPRED 0x00000020 ///< H.264 weighted biprediction for B-frames
706 #define CODEC_FLAG2_MIXED_REFS 0x00000040 ///< H.264 one reference per partition, as opposed to one reference per macroblock
707 #define CODEC_FLAG2_8X8DCT 0x00000080 ///< H.264 high profile 8x8 transform
708 #define CODEC_FLAG2_FASTPSKIP 0x00000100 ///< H.264 fast pskip
709 #define CODEC_FLAG2_AUD 0x00000200 ///< H.264 access unit delimiters
710 #define CODEC_FLAG2_BRDO 0x00000400 ///< B-frame rate-distortion optimization
711 #define CODEC_FLAG2_MBTREE 0x00040000 ///< Use macroblock tree ratecontrol (x264 only)
712 #define CODEC_FLAG2_PSY 0x00080000 ///< Use psycho visual optimizations.
713 #define CODEC_FLAG2_SSIM 0x00100000 ///< Compute SSIM during encoding, error[] values are undefined.
714 #define CODEC_FLAG2_INTRA_REFRESH 0x00200000 ///< Use periodic insertion of intra blocks instead of keyframes.
716 #if FF_API_SNOW_GLOBAL_OPTS
717 #define CODEC_FLAG2_MEMC_ONLY 0x00001000 ///< Only do ME/MC (I frames -> ref, P frame -> ME+MC).
719 #if FF_API_LAME_GLOBAL_OPTS
720 #define CODEC_FLAG2_BIT_RESERVOIR 0x00020000 ///< Use a bit reservoir when encoding if possible
726 /* Unsupported options :
727 * Syntax Arithmetic coding (SAC)
728 * Reference Picture Selection
729 * Independent Segment Decoding */
731 /* codec capabilities */
733 #define CODEC_CAP_DRAW_HORIZ_BAND 0x0001 ///< Decoder can use draw_horiz_band callback.
735 * Codec uses get_buffer() for allocating buffers and supports custom allocators.
736 * If not set, it might not use get_buffer() at all or use operations that
737 * assume the buffer was allocated by avcodec_default_get_buffer.
739 #define CODEC_CAP_DR1 0x0002
740 #if FF_API_PARSE_FRAME
741 /* If 'parse_only' field is true, then avcodec_parse_frame() can be used. */
742 #define CODEC_CAP_PARSE_ONLY 0x0004
744 #define CODEC_CAP_TRUNCATED 0x0008
745 /* Codec can export data for HW decoding (XvMC). */
746 #define CODEC_CAP_HWACCEL 0x0010
748 * Codec has a nonzero delay and needs to be fed with avpkt->data=NULL,
749 * avpkt->size=0 at the end to get the delayed data until the decoder no longer
750 * returns frames. If this is not set, the codec is guaranteed to never be fed
753 #define CODEC_CAP_DELAY 0x0020
755 * Codec can be fed a final frame with a smaller size.
756 * This can be used to prevent truncation of the last audio samples.
758 #define CODEC_CAP_SMALL_LAST_FRAME 0x0040
760 * Codec can export data for HW decoding (VDPAU).
762 #define CODEC_CAP_HWACCEL_VDPAU 0x0080
764 * Codec can output multiple frames per AVPacket
765 * Normally demuxers return one frame at a time, demuxers which do not do
766 * are connected to a parser to split what they return into proper frames.
767 * This flag is reserved to the very rare category of codecs which have a
768 * bitstream that cannot be split into frames without timeconsuming
769 * operations like full decoding. Demuxers carring such bitstreams thus
770 * may return multiple frames in a packet. This has many disadvantages like
771 * prohibiting stream copy in many cases thus it should only be considered
774 #define CODEC_CAP_SUBFRAMES 0x0100
776 * Codec is experimental and is thus avoided in favor of non experimental
779 #define CODEC_CAP_EXPERIMENTAL 0x0200
781 * Codec should fill in channel configuration and samplerate instead of container
783 #define CODEC_CAP_CHANNEL_CONF 0x0400
786 * Codec is able to deal with negative linesizes
788 #define CODEC_CAP_NEG_LINESIZES 0x0800
791 * Codec supports frame-level multithreading.
793 #define CODEC_CAP_FRAME_THREADS 0x1000
795 * Codec supports slice-based (or partition-based) multithreading.
797 #define CODEC_CAP_SLICE_THREADS 0x2000
799 * Codec supports changed parameters at any point.
801 #define CODEC_CAP_PARAM_CHANGE 0x4000
803 * Codec supports avctx->thread_count == 0 (auto).
805 #define CODEC_CAP_AUTO_THREADS 0x8000
809 #define CODEC_CAP_LOSSLESS 0x80000000
811 //The following defines may change, don't expect compatibility if you use them.
812 #define MB_TYPE_INTRA4x4 0x0001
813 #define MB_TYPE_INTRA16x16 0x0002 //FIXME H.264-specific
814 #define MB_TYPE_INTRA_PCM 0x0004 //FIXME H.264-specific
815 #define MB_TYPE_16x16 0x0008
816 #define MB_TYPE_16x8 0x0010
817 #define MB_TYPE_8x16 0x0020
818 #define MB_TYPE_8x8 0x0040
819 #define MB_TYPE_INTERLACED 0x0080
820 #define MB_TYPE_DIRECT2 0x0100 //FIXME
821 #define MB_TYPE_ACPRED 0x0200
822 #define MB_TYPE_GMC 0x0400
823 #define MB_TYPE_SKIP 0x0800
824 #define MB_TYPE_P0L0 0x1000
825 #define MB_TYPE_P1L0 0x2000
826 #define MB_TYPE_P0L1 0x4000
827 #define MB_TYPE_P1L1 0x8000
828 #define MB_TYPE_L0 (MB_TYPE_P0L0 | MB_TYPE_P1L0)
829 #define MB_TYPE_L1 (MB_TYPE_P0L1 | MB_TYPE_P1L1)
830 #define MB_TYPE_L0L1 (MB_TYPE_L0 | MB_TYPE_L1)
831 #define MB_TYPE_QUANT 0x00010000
832 #define MB_TYPE_CBP 0x00020000
833 //Note bits 24-31 are reserved for codec specific use (h264 ref0, mpeg1 0mv, ...)
837 * This specifies the area which should be displayed.
838 * Note there may be multiple such areas for one frame.
840 typedef struct AVPanScan{
843 * - encoding: Set by user.
844 * - decoding: Set by libavcodec.
849 * width and height in 1/16 pel
850 * - encoding: Set by user.
851 * - decoding: Set by libavcodec.
857 * position of the top left corner in 1/16 pel for up to 3 fields/frames
858 * - encoding: Set by user.
859 * - decoding: Set by libavcodec.
861 int16_t position[3][2];
864 #define FF_QSCALE_TYPE_MPEG1 0
865 #define FF_QSCALE_TYPE_MPEG2 1
866 #define FF_QSCALE_TYPE_H264 2
867 #define FF_QSCALE_TYPE_VP56 3
869 #define FF_BUFFER_TYPE_INTERNAL 1
870 #define FF_BUFFER_TYPE_USER 2 ///< direct rendering buffers (image is (de)allocated by user)
871 #define FF_BUFFER_TYPE_SHARED 4 ///< Buffer from somewhere else; don't deallocate image (data/base), all other tables are not shared.
872 #define FF_BUFFER_TYPE_COPY 8 ///< Just a (modified) copy of some other buffer, don't deallocate anything.
874 #if FF_API_OLD_FF_PICT_TYPES
875 /* DEPRECATED, directly use the AV_PICTURE_TYPE_* enum values */
876 #define FF_I_TYPE AV_PICTURE_TYPE_I ///< Intra
877 #define FF_P_TYPE AV_PICTURE_TYPE_P ///< Predicted
878 #define FF_B_TYPE AV_PICTURE_TYPE_B ///< Bi-dir predicted
879 #define FF_S_TYPE AV_PICTURE_TYPE_S ///< S(GMC)-VOP MPEG4
880 #define FF_SI_TYPE AV_PICTURE_TYPE_SI ///< Switching Intra
881 #define FF_SP_TYPE AV_PICTURE_TYPE_SP ///< Switching Predicted
882 #define FF_BI_TYPE AV_PICTURE_TYPE_BI
885 #define FF_BUFFER_HINTS_VALID 0x01 // Buffer hints value is meaningful (if 0 ignore).
886 #define FF_BUFFER_HINTS_READABLE 0x02 // Codec will read from buffer.
887 #define FF_BUFFER_HINTS_PRESERVE 0x04 // User must not alter buffer content.
888 #define FF_BUFFER_HINTS_REUSABLE 0x08 // Codec will reuse the buffer (update).
890 enum AVPacketSideDataType {
892 AV_PKT_DATA_NEW_EXTRADATA,
893 AV_PKT_DATA_PARAM_CHANGE,
896 typedef struct AVPacket {
898 * Presentation timestamp in AVStream->time_base units; the time at which
899 * the decompressed packet will be presented to the user.
900 * Can be AV_NOPTS_VALUE if it is not stored in the file.
901 * pts MUST be larger or equal to dts as presentation cannot happen before
902 * decompression, unless one wants to view hex dumps. Some formats misuse
903 * the terms dts and pts/cts to mean something different. Such timestamps
904 * must be converted to true pts/dts before they are stored in AVPacket.
908 * Decompression timestamp in AVStream->time_base units; the time at which
909 * the packet is decompressed.
910 * Can be AV_NOPTS_VALUE if it is not stored in the file.
917 * A combination of AV_PKT_FLAG values
921 * Additional packet data that can be provided by the container.
922 * Packet can contain several types of side information.
927 enum AVPacketSideDataType type;
932 * Duration of this packet in AVStream->time_base units, 0 if unknown.
933 * Equals next_pts - this_pts in presentation order.
936 void (*destruct)(struct AVPacket *);
938 int64_t pos; ///< byte position in stream, -1 if unknown
941 * Time difference in AVStream->time_base units from the pts of this
942 * packet to the point at which the output from the decoder has converged
943 * independent from the availability of previous frames. That is, the
944 * frames are virtually identical no matter if decoding started from
945 * the very first frame or from this keyframe.
946 * Is AV_NOPTS_VALUE if unknown.
947 * This field is not the display duration of the current packet.
948 * This field has no meaning if the packet does not have AV_PKT_FLAG_KEY
951 * The purpose of this field is to allow seeking in streams that have no
952 * keyframes in the conventional sense. It corresponds to the
953 * recovery point SEI in H.264 and match_time_delta in NUT. It is also
954 * essential for some types of subtitle streams to ensure that all
955 * subtitles are correctly displayed after seeking.
957 int64_t convergence_duration;
959 #define AV_PKT_FLAG_KEY 0x0001 ///< The packet contains a keyframe
960 #define AV_PKT_FLAG_CORRUPT 0x0002 ///< The packet content is corrupted
963 * An AV_PKT_DATA_PARAM_CHANGE side data packet is laid out as follows:
965 * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_COUNT)
966 * s32le channel_count
967 * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_LAYOUT)
968 * u64le channel_layout
969 * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_SAMPLE_RATE)
971 * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_DIMENSIONS)
976 enum AVSideDataParamChangeFlags {
977 AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_COUNT = 0x0001,
978 AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_LAYOUT = 0x0002,
979 AV_SIDE_DATA_PARAM_CHANGE_SAMPLE_RATE = 0x0004,
980 AV_SIDE_DATA_PARAM_CHANGE_DIMENSIONS = 0x0008,
985 * New fields can be added to the end of AVFRAME with minor version
986 * bumps. Similarly fields that are marked as to be only accessed by
987 * av_opt_ptr() can be reordered. This allows 2 forks to add fields
988 * without breaking compatibility with each other.
989 * Removal, reordering and changes in the remaining cases require
990 * a major version bump.
991 * sizeof(AVFrame) must not be used outside libavcodec.
993 typedef struct AVFrame {
994 #if FF_API_DATA_POINTERS
995 #define AV_NUM_DATA_POINTERS 4
997 #define AV_NUM_DATA_POINTERS 8
1000 * pointer to the picture/channel planes.
1001 * This might be different from the first allocated byte
1002 * - encoding: Set by user
1003 * - decoding: set by AVCodecContext.get_buffer()
1005 uint8_t *data[AV_NUM_DATA_POINTERS];
1008 * Size, in bytes, of the data for each picture/channel plane.
1010 * For audio, only linesize[0] may be set. For planar audio, each channel
1011 * plane must be the same size.
1013 * - encoding: Set by user (video only)
1014 * - decoding: set by AVCodecContext.get_buffer()
1016 int linesize[AV_NUM_DATA_POINTERS];
1019 * pointer to the first allocated byte of the picture. Can be used in get_buffer/release_buffer.
1020 * This isn't used by libavcodec unless the default get/release_buffer() is used.
1024 uint8_t *base[AV_NUM_DATA_POINTERS];
1026 * 1 -> keyframe, 0-> not
1027 * - encoding: Set by libavcodec.
1028 * - decoding: Set by libavcodec.
1033 * Picture type of the frame, see ?_TYPE below.
1034 * - encoding: Set by libavcodec. for coded_picture (and set by user for input).
1035 * - decoding: Set by libavcodec.
1037 enum AVPictureType pict_type;
1040 * presentation timestamp in time_base units (time when frame should be shown to user)
1041 * If AV_NOPTS_VALUE then frame_rate = 1/time_base will be assumed.
1042 * - encoding: MUST be set by user.
1043 * - decoding: Set by libavcodec.
1048 * picture number in bitstream order
1049 * - encoding: set by
1050 * - decoding: Set by libavcodec.
1052 int coded_picture_number;
1054 * picture number in display order
1055 * - encoding: set by
1056 * - decoding: Set by libavcodec.
1058 int display_picture_number;
1061 * quality (between 1 (good) and FF_LAMBDA_MAX (bad))
1062 * - encoding: Set by libavcodec. for coded_picture (and set by user for input).
1063 * - decoding: Set by libavcodec.
1067 #if FF_API_AVFRAME_AGE
1069 * @deprecated unused
1071 attribute_deprecated int age;
1075 * is this picture used as reference
1076 * The values for this are the same as the MpegEncContext.picture_structure
1077 * variable, that is 1->top field, 2->bottom field, 3->frame/both fields.
1078 * Set to 4 for delayed, non-reference frames.
1079 * - encoding: unused
1080 * - decoding: Set by libavcodec. (before get_buffer() call)).
1086 * - encoding: unused
1087 * - decoding: Set by libavcodec.
1089 int8_t *qscale_table;
1092 * - encoding: unused
1093 * - decoding: Set by libavcodec.
1098 * mbskip_table[mb]>=1 if MB didn't change
1099 * stride= mb_width = (width+15)>>4
1100 * - encoding: unused
1101 * - decoding: Set by libavcodec.
1103 uint8_t *mbskip_table;
1106 * motion vector table
1109 * int mv_sample_log2= 4 - motion_subsample_log2;
1110 * int mb_width= (width+15)>>4;
1111 * int mv_stride= (mb_width << mv_sample_log2) + 1;
1112 * motion_val[direction][x + y*mv_stride][0->mv_x, 1->mv_y];
1114 * - encoding: Set by user.
1115 * - decoding: Set by libavcodec.
1117 int16_t (*motion_val[2])[2];
1120 * macroblock type table
1121 * mb_type_base + mb_width + 2
1122 * - encoding: Set by user.
1123 * - decoding: Set by libavcodec.
1128 * log2 of the size of the block which a single vector in motion_val represents:
1129 * (4->16x16, 3->8x8, 2-> 4x4, 1-> 2x2)
1130 * - encoding: unused
1131 * - decoding: Set by libavcodec.
1133 uint8_t motion_subsample_log2;
1136 * for some private data of the user
1137 * - encoding: unused
1138 * - decoding: Set by user.
1144 * - encoding: Set by libavcodec. if flags&CODEC_FLAG_PSNR.
1145 * - decoding: unused
1147 uint64_t error[AV_NUM_DATA_POINTERS];
1150 * type of the buffer (to keep track of who has to deallocate data[*])
1151 * - encoding: Set by the one who allocates it.
1152 * - decoding: Set by the one who allocates it.
1153 * Note: User allocated (direct rendering) & internal buffers cannot coexist currently.
1158 * When decoding, this signals how much the picture must be delayed.
1159 * extra_delay = repeat_pict / (2*fps)
1160 * - encoding: unused
1161 * - decoding: Set by libavcodec.
1171 * The content of the picture is interlaced.
1172 * - encoding: Set by user.
1173 * - decoding: Set by libavcodec. (default 0)
1175 int interlaced_frame;
1178 * If the content is interlaced, is top field displayed first.
1179 * - encoding: Set by user.
1180 * - decoding: Set by libavcodec.
1182 int top_field_first;
1186 * - encoding: Set by user.
1187 * - decoding: Set by libavcodec.
1189 AVPanScan *pan_scan;
1192 * Tell user application that palette has changed from previous frame.
1193 * - encoding: ??? (no palette-enabled encoder yet)
1194 * - decoding: Set by libavcodec. (default 0).
1196 int palette_has_changed;
1199 * codec suggestion on buffer type if != 0
1200 * - encoding: unused
1201 * - decoding: Set by libavcodec. (before get_buffer() call)).
1207 * - encoding: unused
1208 * - decoding: Set by libavcodec.
1213 * motion reference frame index
1214 * the order in which these are stored can depend on the codec.
1215 * - encoding: Set by user.
1216 * - decoding: Set by libavcodec.
1218 int8_t *ref_index[2];
1221 * reordered opaque 64bit (generally an integer or a double precision float
1222 * PTS but can be anything).
1223 * The user sets AVCodecContext.reordered_opaque to represent the input at
1225 * the decoder reorders values as needed and sets AVFrame.reordered_opaque
1226 * to exactly one of the values provided by the user through AVCodecContext.reordered_opaque
1227 * @deprecated in favor of pkt_pts
1228 * - encoding: unused
1229 * - decoding: Read by user.
1231 int64_t reordered_opaque;
1234 * hardware accelerator private data (FFmpeg-allocated)
1235 * - encoding: unused
1236 * - decoding: Set by libavcodec
1238 void *hwaccel_picture_private;
1241 * reordered pts from the last AVPacket that has been input into the decoder
1242 * - encoding: unused
1243 * - decoding: Read by user.
1248 * dts from the last AVPacket that has been input into the decoder
1249 * - encoding: unused
1250 * - decoding: Read by user.
1255 * the AVCodecContext which ff_thread_get_buffer() was last called on
1256 * - encoding: Set by libavcodec.
1257 * - decoding: Set by libavcodec.
1259 struct AVCodecContext *owner;
1262 * used by multithreading to store frame-specific info
1263 * - encoding: Set by libavcodec.
1264 * - decoding: Set by libavcodec.
1266 void *thread_opaque;
1269 * number of audio samples (per channel) described by this frame
1270 * - encoding: unused
1271 * - decoding: Set by libavcodec
1276 * pointers to the data planes/channels.
1278 * For video, this should simply point to data[].
1280 * For planar audio, each channel has a separate data pointer, and
1281 * linesize[0] contains the size of each channel buffer.
1282 * For packed audio, there is just one data pointer, and linesize[0]
1283 * contains the total size of the buffer for all channels.
1285 * Note: Both data and extended_data will always be set by get_buffer(),
1286 * but for planar audio with more channels that can fit in data,
1287 * extended_data must be used by the decoder in order to access all
1291 * decoding: set by AVCodecContext.get_buffer()
1293 uint8_t **extended_data;
1296 * sample aspect ratio for the video frame, 0/1 if unknown\unspecified
1297 * - encoding: unused
1298 * - decoding: Read by user.
1300 AVRational sample_aspect_ratio;
1303 * width and height of the video frame
1304 * - encoding: unused
1305 * - decoding: Read by user.
1310 * format of the frame, -1 if unknown or unset
1311 * Values correspond to enum PixelFormat for video frames,
1312 * enum AVSampleFormat for audio)
1313 * - encoding: unused
1314 * - decoding: Read by user.
1319 * frame timestamp estimated using various heuristics, in stream time base
1320 * Code outside libavcodec should access this field using:
1321 * av_opt_ptr(avcodec_get_frame_class(), frame, "best_effort_timestamp");
1322 * - encoding: unused
1323 * - decoding: set by libavcodec, read by user.
1325 int64_t best_effort_timestamp;
1328 * reordered pos from the last AVPacket that has been input into the decoder
1329 * Code outside libavcodec should access this field using:
1330 * av_opt_ptr(avcodec_get_frame_class(), frame, "pkt_pos");
1331 * - encoding: unused
1332 * - decoding: Read by user.
1338 struct AVCodecInternal;
1342 AV_FIELD_PROGRESSIVE,
1343 AV_FIELD_TT, //< Top coded_first, top displayed first
1344 AV_FIELD_BB, //< Bottom coded first, bottom displayed first
1345 AV_FIELD_TB, //< Top coded first, bottom displayed first
1346 AV_FIELD_BT, //< Bottom coded first, top displayed first
1350 * main external API structure.
1351 * New fields can be added to the end with minor version bumps.
1352 * Removal, reordering and changes to existing fields require a major
1354 * Please use AVOptions (av_opt* / av_set/get*()) to access these fields from user
1356 * sizeof(AVCodecContext) must not be used outside libav*.
1358 typedef struct AVCodecContext {
1360 * information on struct for av_log
1361 * - set by avcodec_alloc_context3
1363 const AVClass *av_class;
1365 * the average bitrate
1366 * - encoding: Set by user; unused for constant quantizer encoding.
1367 * - decoding: Set by libavcodec. 0 or some bitrate if this info is available in the stream.
1372 * number of bits the bitstream is allowed to diverge from the reference.
1373 * the reference can be CBR (for CBR pass1) or VBR (for pass2)
1374 * - encoding: Set by user; unused for constant quantizer encoding.
1375 * - decoding: unused
1377 int bit_rate_tolerance;
1381 * - encoding: Set by user.
1382 * - decoding: Set by user.
1387 * Some codecs need additional format info. It is stored here.
1388 * If any muxer uses this then ALL demuxers/parsers AND encoders for the
1389 * specific codec MUST set it correctly otherwise stream copy breaks.
1390 * In general use of this field by muxers is not recommended.
1391 * - encoding: Set by libavcodec.
1392 * - decoding: Set by libavcodec. (FIXME: Is this OK?)
1397 * Motion estimation algorithm used for video coding.
1398 * 1 (zero), 2 (full), 3 (log), 4 (phods), 5 (epzs), 6 (x1), 7 (hex),
1399 * 8 (umh), 9 (iter), 10 (tesa) [7, 8, 10 are x264 specific, 9 is snow specific]
1400 * - encoding: MUST be set by user.
1401 * - decoding: unused
1406 * some codecs need / can use extradata like Huffman tables.
1407 * mjpeg: Huffman tables
1408 * rv10: additional flags
1409 * mpeg4: global headers (they can be in the bitstream or here)
1410 * The allocated memory should be FF_INPUT_BUFFER_PADDING_SIZE bytes larger
1411 * than extradata_size to avoid prolems if it is read with the bitstream reader.
1412 * The bytewise contents of extradata must not depend on the architecture or CPU endianness.
1413 * - encoding: Set/allocated/freed by libavcodec.
1414 * - decoding: Set/allocated/freed by user.
1420 * This is the fundamental unit of time (in seconds) in terms
1421 * of which frame timestamps are represented. For fixed-fps content,
1422 * timebase should be 1/framerate and timestamp increments should be
1424 * - encoding: MUST be set by user.
1425 * - decoding: Set by libavcodec.
1427 AVRational time_base;
1431 * picture width / height.
1432 * - encoding: MUST be set by user.
1433 * - decoding: Set by libavcodec.
1434 * Note: For compatibility it is possible to set this instead of
1435 * coded_width/height before decoding.
1439 #define FF_ASPECT_EXTENDED 15
1442 * the number of pictures in a group of pictures, or 0 for intra_only
1443 * - encoding: Set by user.
1444 * - decoding: unused
1449 * Pixel format, see PIX_FMT_xxx.
1450 * May be set by the demuxer if known from headers.
1451 * May be overriden by the decoder if it knows better.
1452 * - encoding: Set by user.
1453 * - decoding: Set by user if known, overridden by libavcodec if known
1455 enum PixelFormat pix_fmt;
1458 * If non NULL, 'draw_horiz_band' is called by the libavcodec
1459 * decoder to draw a horizontal band. It improves cache usage. Not
1460 * all codecs can do that. You must check the codec capabilities
1462 * When multithreading is used, it may be called from multiple threads
1463 * at the same time; threads might draw different parts of the same AVFrame,
1464 * or multiple AVFrames, and there is no guarantee that slices will be drawn
1466 * The function is also used by hardware acceleration APIs.
1467 * It is called at least once during frame decoding to pass
1468 * the data needed for hardware render.
1469 * In that mode instead of pixel data, AVFrame points to
1470 * a structure specific to the acceleration API. The application
1471 * reads the structure and can change some fields to indicate progress
1473 * - encoding: unused
1474 * - decoding: Set by user.
1475 * @param height the height of the slice
1476 * @param y the y position of the slice
1477 * @param type 1->top field, 2->bottom field, 3->frame
1478 * @param offset offset into the AVFrame.data from which the slice should be read
1480 void (*draw_horiz_band)(struct AVCodecContext *s,
1481 const AVFrame *src, int offset[AV_NUM_DATA_POINTERS],
1482 int y, int type, int height);
1485 int sample_rate; ///< samples per second
1486 int channels; ///< number of audio channels
1489 * audio sample format
1490 * - encoding: Set by user.
1491 * - decoding: Set by libavcodec.
1493 enum AVSampleFormat sample_fmt; ///< sample format
1495 /* The following data should not be initialized. */
1497 * Samples per packet, initialized when calling 'init'.
1500 int frame_number; ///< audio or video frame number
1503 * Encoding: Number of frames delay there will be from the encoder input to
1504 * the decoder output. (we assume the decoder matches the spec)
1505 * Decoding: Number of frames delay in addition to what a standard decoder
1506 * as specified in the spec would produce.
1507 * - encoding: Set by libavcodec.
1508 * - decoding: Set by libavcodec.
1512 /* - encoding parameters */
1513 float qcompress; ///< amount of qscale change between easy & hard scenes (0.0-1.0)
1514 float qblur; ///< amount of qscale smoothing over time (0.0-1.0)
1518 * - encoding: Set by user.
1519 * - decoding: unused
1525 * - encoding: Set by user.
1526 * - decoding: unused
1531 * maximum quantizer difference between frames
1532 * - encoding: Set by user.
1533 * - decoding: unused
1538 * maximum number of B-frames between non-B-frames
1539 * Note: The output will be delayed by max_b_frames+1 relative to the input.
1540 * - encoding: Set by user.
1541 * - decoding: unused
1546 * qscale factor between IP and B-frames
1547 * If > 0 then the last P-frame quantizer will be used (q= lastp_q*factor+offset).
1548 * If < 0 then normal ratecontrol will be done (q= -normal_q*factor+offset).
1549 * - encoding: Set by user.
1550 * - decoding: unused
1552 float b_quant_factor;
1554 /** obsolete FIXME remove */
1556 #define FF_RC_STRATEGY_XVID 1
1558 int b_frame_strategy;
1560 struct AVCodec *codec;
1564 int rtp_payload_size; /* The size of the RTP payload: the coder will */
1565 /* do its best to deliver a chunk with size */
1566 /* below rtp_payload_size, the chunk will start */
1567 /* with a start code on some codecs like H.263. */
1568 /* This doesn't take account of any particular */
1569 /* headers inside the transmitted RTP payload. */
1572 /* The RTP callback: This function is called */
1573 /* every time the encoder has a packet to send. */
1574 /* It depends on the encoder if the data starts */
1575 /* with a Start Code (it should). H.263 does. */
1576 /* mb_nb contains the number of macroblocks */
1577 /* encoded in the RTP payload. */
1578 void (*rtp_callback)(struct AVCodecContext *avctx, void *data, int size, int mb_nb);
1580 /* statistics, used for 2-pass encoding */
1591 * number of bits used for the previously encoded frame
1592 * - encoding: Set by libavcodec.
1593 * - decoding: unused
1598 * Private data of the user, can be used to carry app specific stuff.
1599 * - encoding: Set by user.
1600 * - decoding: Set by user.
1604 char codec_name[32];
1605 enum AVMediaType codec_type; /* see AVMEDIA_TYPE_xxx */
1606 enum CodecID codec_id; /* see CODEC_ID_xxx */
1609 * fourcc (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A').
1610 * This is used to work around some encoder bugs.
1611 * A demuxer should set this to what is stored in the field used to identify the codec.
1612 * If there are multiple such fields in a container then the demuxer should choose the one
1613 * which maximizes the information about the used codec.
1614 * If the codec tag field in a container is larger than 32 bits then the demuxer should
1615 * remap the longer ID to 32 bits with a table or other structure. Alternatively a new
1616 * extra_codec_tag + size could be added but for this a clear advantage must be demonstrated
1618 * - encoding: Set by user, if not then the default based on codec_id will be used.
1619 * - decoding: Set by user, will be converted to uppercase by libavcodec during init.
1621 unsigned int codec_tag;
1624 * Work around bugs in encoders which sometimes cannot be detected automatically.
1625 * - encoding: Set by user
1626 * - decoding: Set by user
1628 int workaround_bugs;
1629 #define FF_BUG_AUTODETECT 1 ///< autodetection
1630 #define FF_BUG_OLD_MSMPEG4 2
1631 #define FF_BUG_XVID_ILACE 4
1632 #define FF_BUG_UMP4 8
1633 #define FF_BUG_NO_PADDING 16
1634 #define FF_BUG_AMV 32
1635 #define FF_BUG_AC_VLC 0 ///< Will be removed, libavcodec can now handle these non-compliant files by default.
1636 #define FF_BUG_QPEL_CHROMA 64
1637 #define FF_BUG_STD_QPEL 128
1638 #define FF_BUG_QPEL_CHROMA2 256
1639 #define FF_BUG_DIRECT_BLOCKSIZE 512
1640 #define FF_BUG_EDGE 1024
1641 #define FF_BUG_HPEL_CHROMA 2048
1642 #define FF_BUG_DC_CLIP 4096
1643 #define FF_BUG_MS 8192 ///< Work around various bugs in Microsoft's broken decoders.
1644 #define FF_BUG_TRUNCATED 16384
1645 //#define FF_BUG_FAKE_SCALABILITY 16 //Autodetection should work 100%.
1648 * luma single coefficient elimination threshold
1649 * - encoding: Set by user.
1650 * - decoding: unused
1652 int luma_elim_threshold;
1655 * chroma single coeff elimination threshold
1656 * - encoding: Set by user.
1657 * - decoding: unused
1659 int chroma_elim_threshold;
1662 * strictly follow the standard (MPEG4, ...).
1663 * - encoding: Set by user.
1664 * - decoding: Set by user.
1665 * Setting this to STRICT or higher means the encoder and decoder will
1666 * generally do stupid things, whereas setting it to unofficial or lower
1667 * will mean the encoder might produce output that is not supported by all
1668 * spec-compliant decoders. Decoders don't differentiate between normal,
1669 * unofficial and experimental (that is, they always try to decode things
1670 * when they can) unless they are explicitly asked to behave stupidly
1671 * (=strictly conform to the specs)
1673 int strict_std_compliance;
1674 #define FF_COMPLIANCE_VERY_STRICT 2 ///< Strictly conform to an older more strict version of the spec or reference software.
1675 #define FF_COMPLIANCE_STRICT 1 ///< Strictly conform to all the things in the spec no matter what consequences.
1676 #define FF_COMPLIANCE_NORMAL 0
1677 #define FF_COMPLIANCE_UNOFFICIAL -1 ///< Allow unofficial extensions
1678 #define FF_COMPLIANCE_EXPERIMENTAL -2 ///< Allow nonstandardized experimental things.
1681 * qscale offset between IP and B-frames
1682 * - encoding: Set by user.
1683 * - decoding: unused
1685 float b_quant_offset;
1689 * Error recognition; higher values will detect more errors but may
1690 * misdetect some more or less valid parts as errors.
1691 * - encoding: unused
1692 * - decoding: Set by user.
1694 attribute_deprecated int error_recognition;
1695 #define FF_ER_CAREFUL 1
1696 #define FF_ER_COMPLIANT 2
1697 #define FF_ER_AGGRESSIVE 3
1698 #define FF_ER_VERY_AGGRESSIVE 4
1699 #define FF_ER_EXPLODE 5
1700 #endif /* FF_API_ER */
1703 * Called at the beginning of each frame to get a buffer for it.
1705 * The function will set AVFrame.data[], AVFrame.linesize[].
1706 * AVFrame.extended_data[] must also be set, but it should be the same as
1707 * AVFrame.data[] except for planar audio with more channels than can fit
1708 * in AVFrame.data[]. In that case, AVFrame.data[] shall still contain as
1709 * many data pointers as it can hold.
1711 * if CODEC_CAP_DR1 is not set then get_buffer() must call
1712 * avcodec_default_get_buffer() instead of providing buffers allocated by
1715 * AVFrame.data[] should be 32- or 16-byte-aligned unless the CPU doesn't
1716 * need it. avcodec_default_get_buffer() aligns the output buffer properly,
1717 * but if get_buffer() is overridden then alignment considerations should
1718 * be taken into account.
1720 * @see avcodec_default_get_buffer()
1724 * If pic.reference is set then the frame will be read later by libavcodec.
1725 * avcodec_align_dimensions2() should be used to find the required width and
1726 * height, as they normally need to be rounded up to the next multiple of 16.
1728 * If frame multithreading is used and thread_safe_callbacks is set,
1729 * it may be called from a different thread, but not from more than one at
1730 * once. Does not need to be reentrant.
1732 * @see release_buffer(), reget_buffer()
1733 * @see avcodec_align_dimensions2()
1737 * Decoders request a buffer of a particular size by setting
1738 * AVFrame.nb_samples prior to calling get_buffer(). The decoder may,
1739 * however, utilize only part of the buffer by setting AVFrame.nb_samples
1740 * to a smaller value in the output frame.
1742 * Decoders cannot use the buffer after returning from
1743 * avcodec_decode_audio4(), so they will not call release_buffer(), as it
1744 * is assumed to be released immediately upon return.
1746 * As a convenience, av_samples_get_buffer_size() and
1747 * av_samples_fill_arrays() in libavutil may be used by custom get_buffer()
1748 * functions to find the required data size and to fill data pointers and
1749 * linesize. In AVFrame.linesize, only linesize[0] may be set for audio
1750 * since all planes must be the same size.
1752 * @see av_samples_get_buffer_size(), av_samples_fill_arrays()
1754 * - encoding: unused
1755 * - decoding: Set by libavcodec, user can override.
1757 int (*get_buffer)(struct AVCodecContext *c, AVFrame *pic);
1760 * Called to release buffers which were allocated with get_buffer.
1761 * A released buffer can be reused in get_buffer().
1762 * pic.data[*] must be set to NULL.
1763 * May be called from a different thread if frame multithreading is used,
1764 * but not by more than one thread at once, so does not need to be reentrant.
1765 * - encoding: unused
1766 * - decoding: Set by libavcodec, user can override.
1768 void (*release_buffer)(struct AVCodecContext *c, AVFrame *pic);
1771 * Size of the frame reordering buffer in the decoder.
1772 * For MPEG-2 it is 1 IPB or 0 low delay IP.
1773 * - encoding: Set by libavcodec.
1774 * - decoding: Set by libavcodec.
1779 * number of bytes per packet if constant and known or 0
1780 * Used by some WAV based audio codecs.
1784 #if FF_API_PARSE_FRAME
1786 * If true, only parsing is done. The frame data is returned.
1787 * Only MPEG audio decoders support this now.
1788 * - encoding: unused
1789 * - decoding: Set by user
1791 attribute_deprecated int parse_only;
1795 * 0-> h263 quant 1-> mpeg quant
1796 * - encoding: Set by user.
1797 * - decoding: unused
1802 * pass1 encoding statistics output buffer
1803 * - encoding: Set by libavcodec.
1804 * - decoding: unused
1809 * pass2 encoding statistics input buffer
1810 * Concatenated stuff from stats_out of pass1 should be placed here.
1811 * - encoding: Allocated/set/freed by user.
1812 * - decoding: unused
1817 * ratecontrol qmin qmax limiting method
1818 * 0-> clipping, 1-> use a nice continous function to limit qscale wthin qmin/qmax.
1819 * - encoding: Set by user.
1820 * - decoding: unused
1828 * ratecontrol override, see RcOverride
1829 * - encoding: Allocated/set/freed by user.
1830 * - decoding: unused
1832 RcOverride *rc_override;
1833 int rc_override_count;
1836 * rate control equation
1837 * - encoding: Set by user
1838 * - decoding: unused
1844 * - encoding: Set by user.
1845 * - decoding: unused
1851 * - encoding: Set by user.
1852 * - decoding: unused
1857 * decoder bitstream buffer size
1858 * - encoding: Set by user.
1859 * - decoding: unused
1862 float rc_buffer_aggressivity;
1865 * qscale factor between P and I-frames
1866 * If > 0 then the last p frame quantizer will be used (q= lastp_q*factor+offset).
1867 * If < 0 then normal ratecontrol will be done (q= -normal_q*factor+offset).
1868 * - encoding: Set by user.
1869 * - decoding: unused
1871 float i_quant_factor;
1874 * qscale offset between P and I-frames
1875 * - encoding: Set by user.
1876 * - decoding: unused
1878 float i_quant_offset;
1881 * initial complexity for pass1 ratecontrol
1882 * - encoding: Set by user.
1883 * - decoding: unused
1885 float rc_initial_cplx;
1888 * DCT algorithm, see FF_DCT_* below
1889 * - encoding: Set by user.
1890 * - decoding: unused
1893 #define FF_DCT_AUTO 0
1894 #define FF_DCT_FASTINT 1
1895 #define FF_DCT_INT 2
1896 #define FF_DCT_MMX 3
1897 #define FF_DCT_MLIB 4
1898 #define FF_DCT_ALTIVEC 5
1899 #define FF_DCT_FAAN 6
1902 * luminance masking (0-> disabled)
1903 * - encoding: Set by user.
1904 * - decoding: unused
1909 * temporary complexity masking (0-> disabled)
1910 * - encoding: Set by user.
1911 * - decoding: unused
1913 float temporal_cplx_masking;
1916 * spatial complexity masking (0-> disabled)
1917 * - encoding: Set by user.
1918 * - decoding: unused
1920 float spatial_cplx_masking;
1923 * p block masking (0-> disabled)
1924 * - encoding: Set by user.
1925 * - decoding: unused
1930 * darkness masking (0-> disabled)
1931 * - encoding: Set by user.
1932 * - decoding: unused
1937 * IDCT algorithm, see FF_IDCT_* below.
1938 * - encoding: Set by user.
1939 * - decoding: Set by user.
1942 #define FF_IDCT_AUTO 0
1943 #define FF_IDCT_INT 1
1944 #define FF_IDCT_SIMPLE 2
1945 #define FF_IDCT_SIMPLEMMX 3
1946 #define FF_IDCT_LIBMPEG2MMX 4
1947 #define FF_IDCT_PS2 5
1948 #define FF_IDCT_MLIB 6
1949 #define FF_IDCT_ARM 7
1950 #define FF_IDCT_ALTIVEC 8
1951 #define FF_IDCT_SH4 9
1952 #define FF_IDCT_SIMPLEARM 10
1953 #define FF_IDCT_H264 11
1954 #define FF_IDCT_VP3 12
1955 #define FF_IDCT_IPP 13
1956 #define FF_IDCT_XVIDMMX 14
1957 #define FF_IDCT_CAVS 15
1958 #define FF_IDCT_SIMPLEARMV5TE 16
1959 #define FF_IDCT_SIMPLEARMV6 17
1960 #define FF_IDCT_SIMPLEVIS 18
1961 #define FF_IDCT_WMV2 19
1962 #define FF_IDCT_FAAN 20
1963 #define FF_IDCT_EA 21
1964 #define FF_IDCT_SIMPLENEON 22
1965 #define FF_IDCT_SIMPLEALPHA 23
1966 #define FF_IDCT_BINK 24
1970 * - encoding: Set by libavcodec.
1971 * - decoding: Set by user (or 0).
1975 * slice offsets in the frame in bytes
1976 * - encoding: Set/allocated by libavcodec.
1977 * - decoding: Set/allocated by user (or NULL).
1982 * error concealment flags
1983 * - encoding: unused
1984 * - decoding: Set by user.
1986 int error_concealment;
1987 #define FF_EC_GUESS_MVS 1
1988 #define FF_EC_DEBLOCK 2
1991 * dsp_mask could be add used to disable unwanted CPU features
1992 * CPU features (i.e. MMX, SSE. ...)
1994 * With the FORCE flag you may instead enable given CPU features.
1995 * (Dangerous: Usable in case of misdetection, improper usage however will
1996 * result into program crash.)
2001 * bits per sample/pixel from the demuxer (needed for huffyuv).
2002 * - encoding: Set by libavcodec.
2003 * - decoding: Set by user.
2005 int bits_per_coded_sample;
2008 * prediction method (needed for huffyuv)
2009 * - encoding: Set by user.
2010 * - decoding: unused
2012 int prediction_method;
2013 #define FF_PRED_LEFT 0
2014 #define FF_PRED_PLANE 1
2015 #define FF_PRED_MEDIAN 2
2018 * sample aspect ratio (0 if unknown)
2019 * That is the width of a pixel divided by the height of the pixel.
2020 * Numerator and denominator must be relatively prime and smaller than 256 for some video standards.
2021 * - encoding: Set by user.
2022 * - decoding: Set by libavcodec.
2024 AVRational sample_aspect_ratio;
2027 * the picture in the bitstream
2028 * - encoding: Set by libavcodec.
2029 * - decoding: Set by libavcodec.
2031 AVFrame *coded_frame;
2035 * - encoding: Set by user.
2036 * - decoding: Set by user.
2039 #define FF_DEBUG_PICT_INFO 1
2040 #define FF_DEBUG_RC 2
2041 #define FF_DEBUG_BITSTREAM 4
2042 #define FF_DEBUG_MB_TYPE 8
2043 #define FF_DEBUG_QP 16
2044 #define FF_DEBUG_MV 32
2045 #define FF_DEBUG_DCT_COEFF 0x00000040
2046 #define FF_DEBUG_SKIP 0x00000080
2047 #define FF_DEBUG_STARTCODE 0x00000100
2048 #define FF_DEBUG_PTS 0x00000200
2049 #define FF_DEBUG_ER 0x00000400
2050 #define FF_DEBUG_MMCO 0x00000800
2051 #define FF_DEBUG_BUGS 0x00001000
2052 #define FF_DEBUG_VIS_QP 0x00002000
2053 #define FF_DEBUG_VIS_MB_TYPE 0x00004000
2054 #define FF_DEBUG_BUFFERS 0x00008000
2055 #define FF_DEBUG_THREADS 0x00010000
2059 * - encoding: Set by user.
2060 * - decoding: Set by user.
2063 #define FF_DEBUG_VIS_MV_P_FOR 0x00000001 //visualize forward predicted MVs of P frames
2064 #define FF_DEBUG_VIS_MV_B_FOR 0x00000002 //visualize forward predicted MVs of B frames
2065 #define FF_DEBUG_VIS_MV_B_BACK 0x00000004 //visualize backward predicted MVs of B frames
2069 * - encoding: Set by libavcodec if flags&CODEC_FLAG_PSNR.
2070 * - decoding: unused
2072 uint64_t error[AV_NUM_DATA_POINTERS];
2075 * motion estimation comparison function
2076 * - encoding: Set by user.
2077 * - decoding: unused
2081 * subpixel motion estimation comparison function
2082 * - encoding: Set by user.
2083 * - decoding: unused
2087 * macroblock comparison function (not supported yet)
2088 * - encoding: Set by user.
2089 * - decoding: unused
2093 * interlaced DCT comparison function
2094 * - encoding: Set by user.
2095 * - decoding: unused
2098 #define FF_CMP_SAD 0
2099 #define FF_CMP_SSE 1
2100 #define FF_CMP_SATD 2
2101 #define FF_CMP_DCT 3
2102 #define FF_CMP_PSNR 4
2103 #define FF_CMP_BIT 5
2105 #define FF_CMP_ZERO 7
2106 #define FF_CMP_VSAD 8
2107 #define FF_CMP_VSSE 9
2108 #define FF_CMP_NSSE 10
2109 #define FF_CMP_W53 11
2110 #define FF_CMP_W97 12
2111 #define FF_CMP_DCTMAX 13
2112 #define FF_CMP_DCT264 14
2113 #define FF_CMP_CHROMA 256
2116 * ME diamond size & shape
2117 * - encoding: Set by user.
2118 * - decoding: unused
2123 * amount of previous MV predictors (2a+1 x 2a+1 square)
2124 * - encoding: Set by user.
2125 * - decoding: unused
2127 int last_predictor_count;
2130 * prepass for motion estimation
2131 * - encoding: Set by user.
2132 * - decoding: unused
2137 * motion estimation prepass comparison function
2138 * - encoding: Set by user.
2139 * - decoding: unused
2144 * ME prepass diamond size & shape
2145 * - encoding: Set by user.
2146 * - decoding: unused
2152 * - encoding: Set by user.
2153 * - decoding: unused
2155 int me_subpel_quality;
2158 * callback to negotiate the pixelFormat
2159 * @param fmt is the list of formats which are supported by the codec,
2160 * it is terminated by -1 as 0 is a valid format, the formats are ordered by quality.
2161 * The first is always the native one.
2162 * @return the chosen format
2163 * - encoding: unused
2164 * - decoding: Set by user, if not set the native format will be chosen.
2166 enum PixelFormat (*get_format)(struct AVCodecContext *s, const enum PixelFormat * fmt);
2169 * DTG active format information (additional aspect ratio
2170 * information only used in DVB MPEG-2 transport streams)
2173 * - encoding: unused
2174 * - decoding: Set by decoder.
2176 int dtg_active_format;
2177 #define FF_DTG_AFD_SAME 8
2178 #define FF_DTG_AFD_4_3 9
2179 #define FF_DTG_AFD_16_9 10
2180 #define FF_DTG_AFD_14_9 11
2181 #define FF_DTG_AFD_4_3_SP_14_9 13
2182 #define FF_DTG_AFD_16_9_SP_14_9 14
2183 #define FF_DTG_AFD_SP_4_3 15
2186 * maximum motion estimation search range in subpel units
2187 * If 0 then no limit.
2189 * - encoding: Set by user.
2190 * - decoding: unused
2195 * intra quantizer bias
2196 * - encoding: Set by user.
2197 * - decoding: unused
2199 int intra_quant_bias;
2200 #define FF_DEFAULT_QUANT_BIAS 999999
2203 * inter quantizer bias
2204 * - encoding: Set by user.
2205 * - decoding: unused
2207 int inter_quant_bias;
2211 * - encoding: unused
2212 * - decoding: Which clrtable should be used for 8bit RGB images.
2213 * Tables have to be stored somewhere. FIXME
2217 #if FF_API_INTERNAL_CONTEXT
2219 * internal_buffer count
2220 * Don't touch, used by libavcodec default_get_buffer().
2221 * @deprecated this field was moved to an internal context
2223 attribute_deprecated int internal_buffer_count;
2227 * Don't touch, used by libavcodec default_get_buffer().
2228 * @deprecated this field was moved to an internal context
2230 attribute_deprecated void *internal_buffer;
2234 * Global quality for codecs which cannot change it per frame.
2235 * This should be proportional to MPEG-1/2/4 qscale.
2236 * - encoding: Set by user.
2237 * - decoding: unused
2241 #define FF_CODER_TYPE_VLC 0
2242 #define FF_CODER_TYPE_AC 1
2243 #define FF_CODER_TYPE_RAW 2
2244 #define FF_CODER_TYPE_RLE 3
2245 #define FF_CODER_TYPE_DEFLATE 4
2248 * - encoding: Set by user.
2249 * - decoding: unused
2255 * - encoding: Set by user.
2256 * - decoding: unused
2262 * - encoding: unused
2263 * - decoding: Set by user.
2265 uint8_t * (*realloc)(struct AVCodecContext *s, uint8_t *buf, int buf_size);
2270 * - encoding: unused
2271 * - decoding: Set by user.
2274 #define SLICE_FLAG_CODED_ORDER 0x0001 ///< draw_horiz_band() is called in coded order instead of display
2275 #define SLICE_FLAG_ALLOW_FIELD 0x0002 ///< allow draw_horiz_band() with field slices (MPEG2 field pics)
2276 #define SLICE_FLAG_ALLOW_PLANE 0x0004 ///< allow draw_horiz_band() with 1 component at a time (SVQ1)
2279 * XVideo Motion Acceleration
2280 * - encoding: forbidden
2281 * - decoding: set by decoder
2283 int xvmc_acceleration;
2286 * macroblock decision mode
2287 * - encoding: Set by user.
2288 * - decoding: unused
2291 #define FF_MB_DECISION_SIMPLE 0 ///< uses mb_cmp
2292 #define FF_MB_DECISION_BITS 1 ///< chooses the one which needs the fewest bits
2293 #define FF_MB_DECISION_RD 2 ///< rate distortion
2296 * custom intra quantization matrix
2297 * - encoding: Set by user, can be NULL.
2298 * - decoding: Set by libavcodec.
2300 uint16_t *intra_matrix;
2303 * custom inter quantization matrix
2304 * - encoding: Set by user, can be NULL.
2305 * - decoding: Set by libavcodec.
2307 uint16_t *inter_matrix;
2310 * fourcc from the AVI stream header (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A').
2311 * This is used to work around some encoder bugs.
2312 * - encoding: unused
2313 * - decoding: Set by user, will be converted to uppercase by libavcodec during init.
2315 unsigned int stream_codec_tag;
2318 * scene change detection threshold
2319 * 0 is default, larger means fewer detected scene changes.
2320 * - encoding: Set by user.
2321 * - decoding: unused
2323 int scenechange_threshold;
2326 * minimum Lagrange multipler
2327 * - encoding: Set by user.
2328 * - decoding: unused
2333 * maximum Lagrange multipler
2334 * - encoding: Set by user.
2335 * - decoding: unused
2339 #if FF_API_PALETTE_CONTROL
2341 * palette control structure
2342 * - encoding: ??? (no palette-enabled encoder yet)
2343 * - decoding: Set by user.
2345 struct AVPaletteControl *palctrl;
2349 * noise reduction strength
2350 * - encoding: Set by user.
2351 * - decoding: unused
2353 int noise_reduction;
2356 * Called at the beginning of a frame to get cr buffer for it.
2357 * Buffer type (size, hints) must be the same. libavcodec won't check it.
2358 * libavcodec will pass previous buffer in pic, function should return
2359 * same buffer or new buffer with old frame "painted" into it.
2360 * If pic.data[0] == NULL must behave like get_buffer().
2361 * if CODEC_CAP_DR1 is not set then reget_buffer() must call
2362 * avcodec_default_reget_buffer() instead of providing buffers allocated by
2364 * - encoding: unused
2365 * - decoding: Set by libavcodec, user can override.
2367 int (*reget_buffer)(struct AVCodecContext *c, AVFrame *pic);
2370 * Number of bits which should be loaded into the rc buffer before decoding starts.
2371 * - encoding: Set by user.
2372 * - decoding: unused
2374 int rc_initial_buffer_occupancy;
2378 * - encoding: Set by user.
2379 * - decoding: unused
2381 int inter_threshold;
2385 * - encoding: Set by user.
2386 * - decoding: Set by user.
2391 * Simulates errors in the bitstream to test error concealment.
2392 * - encoding: Set by user.
2393 * - decoding: unused
2397 #if FF_API_ANTIALIAS_ALGO
2399 * MP3 antialias algorithm, see FF_AA_* below.
2400 * - encoding: unused
2401 * - decoding: Set by user.
2403 attribute_deprecated int antialias_algo;
2404 #define FF_AA_AUTO 0
2405 #define FF_AA_FASTINT 1 //not implemented yet
2407 #define FF_AA_FLOAT 3
2411 * quantizer noise shaping
2412 * - encoding: Set by user.
2413 * - decoding: unused
2415 int quantizer_noise_shaping;
2419 * is used to decide how many independent tasks should be passed to execute()
2420 * - encoding: Set by user.
2421 * - decoding: Set by user.
2426 * The codec may call this to execute several independent things.
2427 * It will return only after finishing all tasks.
2428 * The user may replace this with some multithreaded implementation,
2429 * the default implementation will execute the parts serially.
2430 * @param count the number of things to execute
2431 * - encoding: Set by libavcodec, user can override.
2432 * - decoding: Set by libavcodec, user can override.
2434 int (*execute)(struct AVCodecContext *c, int (*func)(struct AVCodecContext *c2, void *arg), void *arg2, int *ret, int count, int size);
2438 * Can be used by execute() to store some per AVCodecContext stuff.
2439 * - encoding: set by execute()
2440 * - decoding: set by execute()
2442 void *thread_opaque;
2445 * Motion estimation threshold below which no motion estimation is
2446 * performed, but instead the user specified motion vectors are used.
2448 * - encoding: Set by user.
2449 * - decoding: unused
2454 * Macroblock threshold below which the user specified macroblock types will be used.
2455 * - encoding: Set by user.
2456 * - decoding: unused
2461 * precision of the intra DC coefficient - 8
2462 * - encoding: Set by user.
2463 * - decoding: unused
2465 int intra_dc_precision;
2468 * noise vs. sse weight for the nsse comparsion function
2469 * - encoding: Set by user.
2470 * - decoding: unused
2475 * Number of macroblock rows at the top which are skipped.
2476 * - encoding: unused
2477 * - decoding: Set by user.
2482 * Number of macroblock rows at the bottom which are skipped.
2483 * - encoding: unused
2484 * - decoding: Set by user.
2490 * - encoding: Set by user.
2491 * - decoding: Set by libavcodec.
2494 #define FF_PROFILE_UNKNOWN -99
2495 #define FF_PROFILE_RESERVED -100
2497 #define FF_PROFILE_AAC_MAIN 0
2498 #define FF_PROFILE_AAC_LOW 1
2499 #define FF_PROFILE_AAC_SSR 2
2500 #define FF_PROFILE_AAC_LTP 3
2502 #define FF_PROFILE_DTS 20
2503 #define FF_PROFILE_DTS_ES 30
2504 #define FF_PROFILE_DTS_96_24 40
2505 #define FF_PROFILE_DTS_HD_HRA 50
2506 #define FF_PROFILE_DTS_HD_MA 60
2508 #define FF_PROFILE_MPEG2_422 0
2509 #define FF_PROFILE_MPEG2_HIGH 1
2510 #define FF_PROFILE_MPEG2_SS 2
2511 #define FF_PROFILE_MPEG2_SNR_SCALABLE 3
2512 #define FF_PROFILE_MPEG2_MAIN 4
2513 #define FF_PROFILE_MPEG2_SIMPLE 5
2515 #define FF_PROFILE_H264_CONSTRAINED (1<<9) // 8+1; constraint_set1_flag
2516 #define FF_PROFILE_H264_INTRA (1<<11) // 8+3; constraint_set3_flag
2518 #define FF_PROFILE_H264_BASELINE 66
2519 #define FF_PROFILE_H264_CONSTRAINED_BASELINE (66|FF_PROFILE_H264_CONSTRAINED)
2520 #define FF_PROFILE_H264_MAIN 77
2521 #define FF_PROFILE_H264_EXTENDED 88
2522 #define FF_PROFILE_H264_HIGH 100
2523 #define FF_PROFILE_H264_HIGH_10 110
2524 #define FF_PROFILE_H264_HIGH_10_INTRA (110|FF_PROFILE_H264_INTRA)
2525 #define FF_PROFILE_H264_HIGH_422 122
2526 #define FF_PROFILE_H264_HIGH_422_INTRA (122|FF_PROFILE_H264_INTRA)
2527 #define FF_PROFILE_H264_HIGH_444 144
2528 #define FF_PROFILE_H264_HIGH_444_PREDICTIVE 244
2529 #define FF_PROFILE_H264_HIGH_444_INTRA (244|FF_PROFILE_H264_INTRA)
2530 #define FF_PROFILE_H264_CAVLC_444 44
2532 #define FF_PROFILE_VC1_SIMPLE 0
2533 #define FF_PROFILE_VC1_MAIN 1
2534 #define FF_PROFILE_VC1_COMPLEX 2
2535 #define FF_PROFILE_VC1_ADVANCED 3
2537 #define FF_PROFILE_MPEG4_SIMPLE 0
2538 #define FF_PROFILE_MPEG4_SIMPLE_SCALABLE 1
2539 #define FF_PROFILE_MPEG4_CORE 2
2540 #define FF_PROFILE_MPEG4_MAIN 3
2541 #define FF_PROFILE_MPEG4_N_BIT 4
2542 #define FF_PROFILE_MPEG4_SCALABLE_TEXTURE 5
2543 #define FF_PROFILE_MPEG4_SIMPLE_FACE_ANIMATION 6
2544 #define FF_PROFILE_MPEG4_BASIC_ANIMATED_TEXTURE 7
2545 #define FF_PROFILE_MPEG4_HYBRID 8
2546 #define FF_PROFILE_MPEG4_ADVANCED_REAL_TIME 9
2547 #define FF_PROFILE_MPEG4_CORE_SCALABLE 10
2548 #define FF_PROFILE_MPEG4_ADVANCED_CODING 11
2549 #define FF_PROFILE_MPEG4_ADVANCED_CORE 12
2550 #define FF_PROFILE_MPEG4_ADVANCED_SCALABLE_TEXTURE 13
2551 #define FF_PROFILE_MPEG4_SIMPLE_STUDIO 14
2552 #define FF_PROFILE_MPEG4_ADVANCED_SIMPLE 15
2556 * - encoding: Set by user.
2557 * - decoding: Set by libavcodec.
2560 #define FF_LEVEL_UNKNOWN -99
2563 * low resolution decoding, 1-> 1/2 size, 2->1/4 size
2564 * - encoding: unused
2565 * - decoding: Set by user.
2570 * Bitstream width / height, may be different from width/height if lowres enabled.
2571 * - encoding: unused
2572 * - decoding: Set by user before init if known. Codec should override / dynamically change if needed.
2574 int coded_width, coded_height;
2577 * frame skip threshold
2578 * - encoding: Set by user.
2579 * - decoding: unused
2581 int frame_skip_threshold;
2585 * - encoding: Set by user.
2586 * - decoding: unused
2588 int frame_skip_factor;
2591 * frame skip exponent
2592 * - encoding: Set by user.
2593 * - decoding: unused
2598 * frame skip comparison function
2599 * - encoding: Set by user.
2600 * - decoding: unused
2605 * Border processing masking, raises the quantizer for mbs on the borders
2607 * - encoding: Set by user.
2608 * - decoding: unused
2610 float border_masking;
2613 * minimum MB lagrange multipler
2614 * - encoding: Set by user.
2615 * - decoding: unused
2620 * maximum MB lagrange multipler
2621 * - encoding: Set by user.
2622 * - decoding: unused
2628 * - encoding: Set by user.
2629 * - decoding: unused
2631 int me_penalty_compensation;
2635 * - encoding: unused
2636 * - decoding: Set by user.
2638 enum AVDiscard skip_loop_filter;
2642 * - encoding: unused
2643 * - decoding: Set by user.
2645 enum AVDiscard skip_idct;
2649 * - encoding: unused
2650 * - decoding: Set by user.
2652 enum AVDiscard skip_frame;
2656 * - encoding: Set by user.
2657 * - decoding: unused
2663 * - encoding: Set by user.
2664 * - decoding: unused
2668 #if FF_API_X264_GLOBAL_OPTS
2670 * constant rate factor - quality-based VBR - values ~correspond to qps
2671 * - encoding: Set by user.
2672 * - decoding: unused
2673 * @deprecated use 'crf' libx264 private option
2675 attribute_deprecated float crf;
2678 * constant quantization parameter rate control method
2679 * - encoding: Set by user.
2680 * - decoding: unused
2681 * @deprecated use 'cqp' libx264 private option
2683 attribute_deprecated int cqp;
2688 * - encoding: Set by user.
2689 * - decoding: unused
2694 * number of reference frames
2695 * - encoding: Set by user.
2696 * - decoding: Set by lavc.
2701 * chroma qp offset from luma
2702 * - encoding: Set by user.
2703 * - decoding: unused
2707 #if FF_API_X264_GLOBAL_OPTS
2709 * Influence how often B-frames are used.
2710 * - encoding: Set by user.
2711 * - decoding: unused
2713 attribute_deprecated int bframebias;
2717 * trellis RD quantization
2718 * - encoding: Set by user.
2719 * - decoding: unused
2723 #if FF_API_X264_GLOBAL_OPTS
2725 * Reduce fluctuations in qp (before curve compression).
2726 * - encoding: Set by user.
2727 * - decoding: unused
2729 attribute_deprecated float complexityblur;
2732 * in-loop deblocking filter alphac0 parameter
2733 * alpha is in the range -6...6
2734 * - encoding: Set by user.
2735 * - decoding: unused
2737 attribute_deprecated int deblockalpha;
2740 * in-loop deblocking filter beta parameter
2741 * beta is in the range -6...6
2742 * - encoding: Set by user.
2743 * - decoding: unused
2745 attribute_deprecated int deblockbeta;
2748 * macroblock subpartition sizes to consider - p8x8, p4x4, b8x8, i8x8, i4x4
2749 * - encoding: Set by user.
2750 * - decoding: unused
2752 attribute_deprecated int partitions;
2753 #define X264_PART_I4X4 0x001 /* Analyze i4x4 */
2754 #define X264_PART_I8X8 0x002 /* Analyze i8x8 (requires 8x8 transform) */
2755 #define X264_PART_P8X8 0x010 /* Analyze p16x8, p8x16 and p8x8 */
2756 #define X264_PART_P4X4 0x020 /* Analyze p8x4, p4x8, p4x4 */
2757 #define X264_PART_B8X8 0x100 /* Analyze b16x8, b8x16 and b8x8 */
2760 * direct MV prediction mode - 0 (none), 1 (spatial), 2 (temporal), 3 (auto)
2761 * - encoding: Set by user.
2762 * - decoding: unused
2764 attribute_deprecated int directpred;
2768 * Audio cutoff bandwidth (0 means "automatic")
2769 * - encoding: Set by user.
2770 * - decoding: unused
2775 * Multiplied by qscale for each frame and added to scene_change_score.
2776 * - encoding: Set by user.
2777 * - decoding: unused
2779 int scenechange_factor;
2783 * Note: Value depends upon the compare function used for fullpel ME.
2784 * - encoding: Set by user.
2785 * - decoding: unused
2790 * Adjust sensitivity of b_frame_strategy 1.
2791 * - encoding: Set by user.
2792 * - decoding: unused
2797 * - encoding: Set by user.
2798 * - decoding: unused
2800 int compression_level;
2801 #define FF_COMPRESSION_DEFAULT -1
2804 * - encoding: Set by user.
2805 * - decoding: unused
2807 int min_prediction_order;
2810 * - encoding: Set by user.
2811 * - decoding: unused
2813 int max_prediction_order;
2815 #if FF_API_FLAC_GLOBAL_OPTS
2817 * @name FLAC options
2818 * @deprecated Use FLAC encoder private options instead.
2823 * LPC coefficient precision - used by FLAC encoder
2824 * - encoding: Set by user.
2825 * - decoding: unused
2827 attribute_deprecated int lpc_coeff_precision;
2830 * search method for selecting prediction order
2831 * - encoding: Set by user.
2832 * - decoding: unused
2834 attribute_deprecated int prediction_order_method;
2837 * - encoding: Set by user.
2838 * - decoding: unused
2840 attribute_deprecated int min_partition_order;
2843 * - encoding: Set by user.
2844 * - decoding: unused
2846 attribute_deprecated int max_partition_order;
2853 * GOP timecode frame start number
2854 * - encoding: Set by user, in non drop frame format
2855 * - decoding: Set by libavcodec (timecode in the 25 bits format, -1 if unset)
2857 int64_t timecode_frame_start;
2859 #if FF_API_REQUEST_CHANNELS
2861 * Decoder should decode to this many channels if it can (0 for default)
2862 * - encoding: unused
2863 * - decoding: Set by user.
2864 * @deprecated Deprecated in favor of request_channel_layout.
2866 int request_channels;
2869 #if FF_API_DRC_SCALE
2871 * Percentage of dynamic range compression to be applied by the decoder.
2872 * The default value is 1.0, corresponding to full compression.
2873 * - encoding: unused
2874 * - decoding: Set by user.
2875 * @deprecated use AC3 decoder private option instead.
2877 attribute_deprecated float drc_scale;
2881 * opaque 64bit number (generally a PTS) that will be reordered and
2882 * output in AVFrame.reordered_opaque
2883 * @deprecated in favor of pkt_pts
2884 * - encoding: unused
2885 * - decoding: Set by user.
2887 int64_t reordered_opaque;
2890 * Bits per sample/pixel of internal libavcodec pixel/sample format.
2891 * - encoding: set by user.
2892 * - decoding: set by libavcodec.
2894 int bits_per_raw_sample;
2897 * Audio channel layout.
2898 * - encoding: set by user.
2899 * - decoding: set by user, may be overwritten by libavcodec.
2901 uint64_t channel_layout;
2904 * Request decoder to use this channel layout if it can (0 for default)
2905 * - encoding: unused
2906 * - decoding: Set by user.
2908 uint64_t request_channel_layout;
2911 * Ratecontrol attempt to use, at maximum, <value> of what can be used without an underflow.
2912 * - encoding: Set by user.
2913 * - decoding: unused.
2915 float rc_max_available_vbv_use;
2918 * Ratecontrol attempt to use, at least, <value> times the amount needed to prevent a vbv overflow.
2919 * - encoding: Set by user.
2920 * - decoding: unused.
2922 float rc_min_vbv_overflow_use;
2925 * Hardware accelerator in use
2926 * - encoding: unused.
2927 * - decoding: Set by libavcodec
2929 struct AVHWAccel *hwaccel;
2932 * For some codecs, the time base is closer to the field rate than the frame rate.
2933 * Most notably, H.264 and MPEG-2 specify time_base as half of frame duration
2934 * if no telecine is used ...
2936 * Set to time_base ticks per frame. Default 1, e.g., H.264/MPEG-2 set it to 2.
2938 int ticks_per_frame;
2941 * Hardware accelerator context.
2942 * For some hardware accelerators, a global context needs to be
2943 * provided by the user. In that case, this holds display-dependent
2944 * data FFmpeg cannot instantiate itself. Please refer to the
2945 * FFmpeg HW accelerator documentation to know how to fill this
2946 * is. e.g. for VA API, this is a struct vaapi_context.
2947 * - encoding: unused
2948 * - decoding: Set by user
2950 void *hwaccel_context;
2953 * Chromaticity coordinates of the source primaries.
2954 * - encoding: Set by user
2955 * - decoding: Set by libavcodec
2957 enum AVColorPrimaries color_primaries;
2960 * Color Transfer Characteristic.
2961 * - encoding: Set by user
2962 * - decoding: Set by libavcodec
2964 enum AVColorTransferCharacteristic color_trc;
2967 * YUV colorspace type.
2968 * - encoding: Set by user
2969 * - decoding: Set by libavcodec
2971 enum AVColorSpace colorspace;
2974 * MPEG vs JPEG YUV range.
2975 * - encoding: Set by user
2976 * - decoding: Set by libavcodec
2978 enum AVColorRange color_range;
2981 * This defines the location of chroma samples.
2982 * - encoding: Set by user
2983 * - decoding: Set by libavcodec
2985 enum AVChromaLocation chroma_sample_location;
2988 * The codec may call this to execute several independent things.
2989 * It will return only after finishing all tasks.
2990 * The user may replace this with some multithreaded implementation,
2991 * the default implementation will execute the parts serially.
2992 * Also see avcodec_thread_init and e.g. the --enable-pthread configure option.
2993 * @param c context passed also to func
2994 * @param count the number of things to execute
2995 * @param arg2 argument passed unchanged to func
2996 * @param ret return values of executed functions, must have space for "count" values. May be NULL.
2997 * @param func function that will be called count times, with jobnr from 0 to count-1.
2998 * threadnr will be in the range 0 to c->thread_count-1 < MAX_THREADS and so that no
2999 * two instances of func executing at the same time will have the same threadnr.
3000 * @return always 0 currently, but code should handle a future improvement where when any call to func
3001 * returns < 0 no further calls to func may be done and < 0 is returned.
3002 * - encoding: Set by libavcodec, user can override.
3003 * - decoding: Set by libavcodec, user can override.
3005 int (*execute2)(struct AVCodecContext *c, int (*func)(struct AVCodecContext *c2, void *arg, int jobnr, int threadnr), void *arg2, int *ret, int count);
3007 #if FF_API_X264_GLOBAL_OPTS
3009 * explicit P-frame weighted prediction analysis method
3011 * 1: fast blind weighting (one reference duplicate with -1 offset)
3012 * 2: smart weighting (full fade detection analysis)
3013 * - encoding: Set by user.
3014 * - decoding: unused
3016 attribute_deprecated int weighted_p_pred;
3021 * 1: Variance AQ (complexity mask)
3022 * 2: Auto-variance AQ (experimental)
3023 * - encoding: Set by user
3024 * - decoding: unused
3026 attribute_deprecated int aq_mode;
3030 * Reduces blocking and blurring in flat and textured areas.
3031 * - encoding: Set by user
3032 * - decoding: unused
3034 attribute_deprecated float aq_strength;
3038 * Strength of psychovisual optimization
3039 * - encoding: Set by user
3040 * - decoding: unused
3042 attribute_deprecated float psy_rd;
3046 * Strength of psychovisual optimization
3047 * - encoding: Set by user
3048 * - decoding: unused
3050 attribute_deprecated float psy_trellis;
3054 * Number of frames for frametype and ratecontrol lookahead
3055 * - encoding: Set by user
3056 * - decoding: unused
3058 attribute_deprecated int rc_lookahead;
3061 * Constant rate factor maximum
3062 * With CRF encoding mode and VBV restrictions enabled, prevents quality from being worse
3063 * than crf_max, even if doing so would violate VBV restrictions.
3064 * - encoding: Set by user.
3065 * - decoding: unused
3067 attribute_deprecated float crf_max;
3070 int log_level_offset;
3072 #if FF_API_FLAC_GLOBAL_OPTS
3074 * Determine which LPC analysis algorithm to use.
3075 * - encoding: Set by user
3076 * - decoding: unused
3078 attribute_deprecated enum AVLPCType lpc_type;
3081 * Number of passes to use for Cholesky factorization during LPC analysis
3082 * - encoding: Set by user
3083 * - decoding: unused
3085 attribute_deprecated int lpc_passes;
3090 * Indicates number of picture subdivisions. Used for parallelized
3092 * - encoding: Set by user
3093 * - decoding: unused
3098 * Header containing style information for text subtitles.
3099 * For SUBTITLE_ASS subtitle type, it should contain the whole ASS
3100 * [Script Info] and [V4+ Styles] section, plus the [Events] line and
3101 * the Format line following. It shouldn't include any Dialogue line.
3102 * - encoding: Set/allocated/freed by user (before avcodec_open2())
3103 * - decoding: Set/allocated/freed by libavcodec (by avcodec_open2())
3105 uint8_t *subtitle_header;
3106 int subtitle_header_size;
3109 * Current packet as passed into the decoder, to avoid having
3110 * to pass the packet into every function. Currently only valid
3111 * inside lavc and get/release_buffer callbacks.
3112 * - decoding: set by avcodec_decode_*, read by get_buffer() for setting pkt_pts
3113 * - encoding: unused
3117 #if FF_API_INTERNAL_CONTEXT
3119 * Whether this is a copy of the context which had init() called on it.
3120 * This is used by multithreading - shared tables and picture pointers
3121 * should be freed from the original context only.
3122 * - encoding: Set by libavcodec.
3123 * - decoding: Set by libavcodec.
3125 * @deprecated this field has been moved to an internal context
3127 attribute_deprecated int is_copy;
3131 * Which multithreading methods to use.
3132 * Use of FF_THREAD_FRAME will increase decoding delay by one frame per thread,
3133 * so clients which cannot provide future frames should not use it.
3135 * - encoding: Set by user, otherwise the default is used.
3136 * - decoding: Set by user, otherwise the default is used.
3139 #define FF_THREAD_FRAME 1 ///< Decode more than one frame at once
3140 #define FF_THREAD_SLICE 2 ///< Decode more than one part of a single frame at once
3143 * Which multithreading methods are in use by the codec.
3144 * - encoding: Set by libavcodec.
3145 * - decoding: Set by libavcodec.
3147 int active_thread_type;
3150 * Set by the client if its custom get_buffer() callback can be called
3151 * from another thread, which allows faster multithreaded decoding.
3152 * draw_horiz_band() will be called from other threads regardless of this setting.
3153 * Ignored if the default get_buffer() is used.
3154 * - encoding: Set by user.
3155 * - decoding: Set by user.
3157 int thread_safe_callbacks;
3160 * VBV delay coded in the last frame (in periods of a 27 MHz clock).
3161 * Used for compliant TS muxing.
3162 * - encoding: Set by libavcodec.
3163 * - decoding: unused.
3168 * Type of service that the audio stream conveys.
3169 * - encoding: Set by user.
3170 * - decoding: Set by libavcodec.
3172 enum AVAudioServiceType audio_service_type;
3175 * desired sample format
3176 * - encoding: Not used.
3177 * - decoding: Set by user.
3178 * Decoder will decode to this format if it can.
3180 enum AVSampleFormat request_sample_fmt;
3183 * Error recognition; may misdetect some more or less valid parts as errors.
3184 * - encoding: unused
3185 * - decoding: Set by user.
3187 int err_recognition;
3188 #define AV_EF_CRCCHECK (1<<0)
3189 #define AV_EF_BITSTREAM (1<<1)
3190 #define AV_EF_BUFFER (1<<2)
3191 #define AV_EF_EXPLODE (1<<3)
3193 #define AV_EF_CAREFUL (1<<16)
3194 #define AV_EF_COMPLIANT (1<<17)
3195 #define AV_EF_AGGRESSIVE (1<<18)
3198 * Private context used for internal data.
3200 * Unlike priv_data, this is not codec-specific. It is used in general
3201 * libavcodec functions.
3203 struct AVCodecInternal *internal;
3206 * - encoding: set by libavcodec
3207 * - decoding: Set by libavcodec
3209 enum AVFieldOrder field_order;
3212 * Current statistics for PTS correction.
3213 * - decoding: maintained and used by libavcodec, not intended to be used by user apps
3214 * - encoding: unused
3216 int64_t pts_correction_num_faulty_pts; /// Number of incorrect PTS values so far
3217 int64_t pts_correction_num_faulty_dts; /// Number of incorrect DTS values so far
3218 int64_t pts_correction_last_pts; /// PTS of the last frame
3219 int64_t pts_correction_last_dts; /// DTS of the last frame
3226 typedef struct AVProfile {
3228 const char *name; ///< short name for the profile
3231 typedef struct AVCodecDefault AVCodecDefault;
3236 typedef struct AVCodec {
3238 * Name of the codec implementation.
3239 * The name is globally unique among encoders and among decoders (but an
3240 * encoder and a decoder can share the same name).
3241 * This is the primary way to find a codec from the user perspective.
3244 enum AVMediaType type;
3247 int (*init)(AVCodecContext *);
3248 int (*encode)(AVCodecContext *, uint8_t *buf, int buf_size, void *data);
3249 int (*close)(AVCodecContext *);
3250 int (*decode)(AVCodecContext *, void *outdata, int *outdata_size, AVPacket *avpkt);
3252 * Codec capabilities.
3256 struct AVCodec *next;
3259 * Will be called when seeking
3261 void (*flush)(AVCodecContext *);
3262 const AVRational *supported_framerates; ///< array of supported framerates, or NULL if any, array is terminated by {0,0}
3263 const enum PixelFormat *pix_fmts; ///< array of supported pixel formats, or NULL if unknown, array is terminated by -1
3265 * Descriptive name for the codec, meant to be more human readable than name.
3266 * You should use the NULL_IF_CONFIG_SMALL() macro to define it.
3268 const char *long_name;
3269 const int *supported_samplerates; ///< array of supported audio samplerates, or NULL if unknown, array is terminated by 0
3270 const enum AVSampleFormat *sample_fmts; ///< array of supported sample formats, or NULL if unknown, array is terminated by -1
3271 const uint64_t *channel_layouts; ///< array of support channel layouts, or NULL if unknown. array is terminated by 0
3272 uint8_t max_lowres; ///< maximum value for lowres supported by the decoder
3273 const AVClass *priv_class; ///< AVClass for the private context
3274 const AVProfile *profiles; ///< array of recognized profiles, or NULL if unknown, array is terminated by {FF_PROFILE_UNKNOWN}
3277 * @name Frame-level threading support functions
3281 * If defined, called on thread contexts when they are created.
3282 * If the codec allocates writable tables in init(), re-allocate them here.
3283 * priv_data will be set to a copy of the original.
3285 int (*init_thread_copy)(AVCodecContext *);
3287 * Copy necessary context variables from a previous thread context to the current one.
3288 * If not defined, the next thread will start automatically; otherwise, the codec
3289 * must call ff_thread_finish_setup().
3291 * dst and src will (rarely) point to the same context, in which case memcpy should be skipped.
3293 int (*update_thread_context)(AVCodecContext *dst, const AVCodecContext *src);
3297 * Private codec-specific defaults.
3299 const AVCodecDefault *defaults;
3302 * Initialize codec static data, called from avcodec_register().
3304 void (*init_static_data)(struct AVCodec *codec);
3310 typedef struct AVHWAccel {
3312 * Name of the hardware accelerated codec.
3313 * The name is globally unique among encoders and among decoders (but an
3314 * encoder and a decoder can share the same name).
3319 * Type of codec implemented by the hardware accelerator.
3321 * See AVMEDIA_TYPE_xxx
3323 enum AVMediaType type;
3326 * Codec implemented by the hardware accelerator.
3333 * Supported pixel format.
3335 * Only hardware accelerated formats are supported here.
3337 enum PixelFormat pix_fmt;
3340 * Hardware accelerated codec capabilities.
3341 * see FF_HWACCEL_CODEC_CAP_*
3345 struct AVHWAccel *next;
3348 * Called at the beginning of each frame or field picture.
3350 * Meaningful frame information (codec specific) is guaranteed to
3351 * be parsed at this point. This function is mandatory.
3353 * Note that buf can be NULL along with buf_size set to 0.
3354 * Otherwise, this means the whole frame is available at this point.
3356 * @param avctx the codec context
3357 * @param buf the frame data buffer base
3358 * @param buf_size the size of the frame in bytes
3359 * @return zero if successful, a negative value otherwise
3361 int (*start_frame)(AVCodecContext *avctx, const uint8_t *buf, uint32_t buf_size);
3364 * Callback for each slice.
3366 * Meaningful slice information (codec specific) is guaranteed to
3367 * be parsed at this point. This function is mandatory.
3369 * @param avctx the codec context
3370 * @param buf the slice data buffer base
3371 * @param buf_size the size of the slice in bytes
3372 * @return zero if successful, a negative value otherwise
3374 int (*decode_slice)(AVCodecContext *avctx, const uint8_t *buf, uint32_t buf_size);
3377 * Called at the end of each frame or field picture.
3379 * The whole picture is parsed at this point and can now be sent
3380 * to the hardware accelerator. This function is mandatory.
3382 * @param avctx the codec context
3383 * @return zero if successful, a negative value otherwise
3385 int (*end_frame)(AVCodecContext *avctx);
3388 * Size of HW accelerator private data.
3390 * Private data is allocated with av_mallocz() before
3391 * AVCodecContext.get_buffer() and deallocated after
3392 * AVCodecContext.release_buffer().
3398 * four components are given, that's all.
3399 * the last component is alpha
3401 typedef struct AVPicture {
3402 uint8_t *data[AV_NUM_DATA_POINTERS];
3403 int linesize[AV_NUM_DATA_POINTERS]; ///< number of bytes per line
3406 #define AVPALETTE_SIZE 1024
3407 #define AVPALETTE_COUNT 256
3408 #if FF_API_PALETTE_CONTROL
3411 * This structure defines a method for communicating palette changes
3412 * between and demuxer and a decoder.
3414 * @deprecated Use AVPacket to send palette changes instead.
3415 * This is totally broken.
3417 typedef struct AVPaletteControl {
3419 /* Demuxer sets this to 1 to indicate the palette has changed;
3420 * decoder resets to 0. */
3421 int palette_changed;
3423 /* 4-byte ARGB palette entries, stored in native byte order; note that
3424 * the individual palette components should be on a 8-bit scale; if
3425 * the palette data comes from an IBM VGA native format, the component
3426 * data is probably 6 bits in size and needs to be scaled. */
3427 unsigned int palette[AVPALETTE_COUNT];
3429 } AVPaletteControl attribute_deprecated;
3432 enum AVSubtitleType {
3435 SUBTITLE_BITMAP, ///< A bitmap, pict will be set
3438 * Plain text, the text field must be set by the decoder and is
3439 * authoritative. ass and pict fields may contain approximations.
3444 * Formatted text, the ass field must be set by the decoder and is
3445 * authoritative. pict and text fields may contain approximations.
3450 typedef struct AVSubtitleRect {
3451 int x; ///< top left corner of pict, undefined when pict is not set
3452 int y; ///< top left corner of pict, undefined when pict is not set
3453 int w; ///< width of pict, undefined when pict is not set
3454 int h; ///< height of pict, undefined when pict is not set
3455 int nb_colors; ///< number of colors in pict, undefined when pict is not set
3458 * data+linesize for the bitmap of this subtitle.
3459 * can be set for text/ass as well once they where rendered
3462 enum AVSubtitleType type;
3464 char *text; ///< 0 terminated plain UTF-8 text
3467 * 0 terminated ASS/SSA compatible event line.
3468 * The pressentation of this is unaffected by the other values in this
3474 typedef struct AVSubtitle {
3475 uint16_t format; /* 0 = graphics */
3476 uint32_t start_display_time; /* relative to packet pts, in ms */
3477 uint32_t end_display_time; /* relative to packet pts, in ms */
3479 AVSubtitleRect **rects;
3480 int64_t pts; ///< Same as packet pts, in AV_TIME_BASE
3483 /* packet functions */
3486 * @deprecated use NULL instead
3488 attribute_deprecated void av_destruct_packet_nofree(AVPacket *pkt);
3491 * Default packet destructor.
3493 void av_destruct_packet(AVPacket *pkt);
3496 * Initialize optional fields of a packet with default values.
3500 void av_init_packet(AVPacket *pkt);
3503 * Allocate the payload of a packet and initialize its fields with
3507 * @param size wanted payload size
3508 * @return 0 if OK, AVERROR_xxx otherwise
3510 int av_new_packet(AVPacket *pkt, int size);
3513 * Reduce packet size, correctly zeroing padding
3516 * @param size new size
3518 void av_shrink_packet(AVPacket *pkt, int size);
3521 * Increase packet size, correctly zeroing padding
3524 * @param grow_by number of bytes by which to increase the size of the packet
3526 int av_grow_packet(AVPacket *pkt, int grow_by);
3529 * @warning This is a hack - the packet memory allocation stuff is broken. The
3530 * packet is allocated if it was not really allocated.
3532 int av_dup_packet(AVPacket *pkt);
3537 * @param pkt packet to free
3539 void av_free_packet(AVPacket *pkt);
3542 * Allocate new information of a packet.
3545 * @param type side information type
3546 * @param size side information size
3547 * @return pointer to fresh allocated data or NULL otherwise
3549 uint8_t* av_packet_new_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
3553 * Get side information from packet.
3556 * @param type desired side information type
3557 * @param size pointer for side information size to store (optional)
3558 * @return pointer to data if present or NULL otherwise
3560 uint8_t* av_packet_get_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
3563 int av_packet_merge_side_data(AVPacket *pkt);
3565 int av_packet_split_side_data(AVPacket *pkt);
3570 struct ReSampleContext;
3571 struct AVResampleContext;
3573 typedef struct ReSampleContext ReSampleContext;
3576 * Initialize audio resampling context.
3578 * @param output_channels number of output channels
3579 * @param input_channels number of input channels
3580 * @param output_rate output sample rate
3581 * @param input_rate input sample rate
3582 * @param sample_fmt_out requested output sample format
3583 * @param sample_fmt_in input sample format
3584 * @param filter_length length of each FIR filter in the filterbank relative to the cutoff frequency
3585 * @param log2_phase_count log2 of the number of entries in the polyphase filterbank
3586 * @param linear if 1 then the used FIR filter will be linearly interpolated
3587 between the 2 closest, if 0 the closest will be used
3588 * @param cutoff cutoff frequency, 1.0 corresponds to half the output sampling rate
3589 * @return allocated ReSampleContext, NULL if error occurred
3591 ReSampleContext *av_audio_resample_init(int output_channels, int input_channels,
3592 int output_rate, int input_rate,
3593 enum AVSampleFormat sample_fmt_out,
3594 enum AVSampleFormat sample_fmt_in,
3595 int filter_length, int log2_phase_count,
3596 int linear, double cutoff);
3598 int audio_resample(ReSampleContext *s, short *output, short *input, int nb_samples);
3601 * Free resample context.
3603 * @param s a non-NULL pointer to a resample context previously
3604 * created with av_audio_resample_init()
3606 void audio_resample_close(ReSampleContext *s);
3610 * Initialize an audio resampler.
3611 * Note, if either rate is not an integer then simply scale both rates up so they are.
3612 * @param filter_length length of each FIR filter in the filterbank relative to the cutoff freq
3613 * @param log2_phase_count log2 of the number of entries in the polyphase filterbank
3614 * @param linear If 1 then the used FIR filter will be linearly interpolated
3615 between the 2 closest, if 0 the closest will be used
3616 * @param cutoff cutoff frequency, 1.0 corresponds to half the output sampling rate
3618 struct AVResampleContext *av_resample_init(int out_rate, int in_rate, int filter_length, int log2_phase_count, int linear, double cutoff);
3621 * Resample an array of samples using a previously configured context.
3622 * @param src an array of unconsumed samples
3623 * @param consumed the number of samples of src which have been consumed are returned here
3624 * @param src_size the number of unconsumed samples available
3625 * @param dst_size the amount of space in samples available in dst
3626 * @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.
3627 * @return the number of samples written in dst or -1 if an error occurred
3629 int av_resample(struct AVResampleContext *c, short *dst, short *src, int *consumed, int src_size, int dst_size, int update_ctx);
3633 * Compensate samplerate/timestamp drift. The compensation is done by changing
3634 * the resampler parameters, so no audible clicks or similar distortions occur
3635 * @param compensation_distance distance in output samples over which the compensation should be performed
3636 * @param sample_delta number of output samples which should be output less
3638 * example: av_resample_compensate(c, 10, 500)
3639 * here instead of 510 samples only 500 samples would be output
3641 * note, due to rounding the actual compensation might be slightly different,
3642 * especially if the compensation_distance is large and the in_rate used during init is small
3644 void av_resample_compensate(struct AVResampleContext *c, int sample_delta, int compensation_distance);
3645 void av_resample_close(struct AVResampleContext *c);
3648 * Allocate memory for a picture. Call avpicture_free() to free it.
3650 * @see avpicture_fill()
3652 * @param picture the picture to be filled in
3653 * @param pix_fmt the format of the picture
3654 * @param width the width of the picture
3655 * @param height the height of the picture
3656 * @return zero if successful, a negative value if not
3658 int avpicture_alloc(AVPicture *picture, enum PixelFormat pix_fmt, int width, int height);
3661 * Free a picture previously allocated by avpicture_alloc().
3662 * The data buffer used by the AVPicture is freed, but the AVPicture structure
3665 * @param picture the AVPicture to be freed
3667 void avpicture_free(AVPicture *picture);
3670 * Fill in the AVPicture fields.
3671 * The fields of the given AVPicture are filled in by using the 'ptr' address
3672 * which points to the image data buffer. Depending on the specified picture
3673 * format, one or multiple image data pointers and line sizes will be set.
3674 * If a planar format is specified, several pointers will be set pointing to
3675 * the different picture planes and the line sizes of the different planes
3676 * will be stored in the lines_sizes array.
3677 * Call with ptr == NULL to get the required size for the ptr buffer.
3679 * To allocate the buffer and fill in the AVPicture fields in one call,
3680 * use avpicture_alloc().
3682 * @param picture AVPicture whose fields are to be filled in
3683 * @param ptr Buffer which will contain or contains the actual image data
3684 * @param pix_fmt The format in which the picture data is stored.
3685 * @param width the width of the image in pixels
3686 * @param height the height of the image in pixels
3687 * @return size of the image data in bytes
3689 int avpicture_fill(AVPicture *picture, uint8_t *ptr,
3690 enum PixelFormat pix_fmt, int width, int height);
3693 * Copy pixel data from an AVPicture into a buffer.
3694 * The data is stored compactly, without any gaps for alignment or padding
3695 * which may be applied by avpicture_fill().
3697 * @see avpicture_get_size()
3699 * @param[in] src AVPicture containing image data
3700 * @param[in] pix_fmt The format in which the picture data is stored.
3701 * @param[in] width the width of the image in pixels.
3702 * @param[in] height the height of the image in pixels.
3703 * @param[out] dest A buffer into which picture data will be copied.
3704 * @param[in] dest_size The size of 'dest'.
3705 * @return The number of bytes written to dest, or a negative value (error code) on error.
3707 int avpicture_layout(const AVPicture* src, enum PixelFormat pix_fmt, int width, int height,
3708 unsigned char *dest, int dest_size);
3711 * Calculate the size in bytes that a picture of the given width and height
3712 * would occupy if stored in the given picture format.
3713 * Note that this returns the size of a compact representation as generated
3714 * by avpicture_layout(), which can be smaller than the size required for e.g.
3717 * @param pix_fmt the given picture format
3718 * @param width the width of the image
3719 * @param height the height of the image
3720 * @return Image data size in bytes or -1 on error (e.g. too large dimensions).
3722 int avpicture_get_size(enum PixelFormat pix_fmt, int width, int height);
3723 void avcodec_get_chroma_sub_sample(enum PixelFormat pix_fmt, int *h_shift, int *v_shift);
3726 * Get the name of a codec.
3727 * @return a static string identifying the codec; never NULL
3729 const char *avcodec_get_name(enum CodecID id);
3731 #if FF_API_GET_PIX_FMT_NAME
3733 * Return the short name for a pixel format.
3735 * \see av_get_pix_fmt(), av_get_pix_fmt_string().
3736 * @deprecated Deprecated in favor of av_get_pix_fmt_name().
3738 attribute_deprecated
3739 const char *avcodec_get_pix_fmt_name(enum PixelFormat pix_fmt);
3742 void avcodec_set_dimensions(AVCodecContext *s, int width, int height);
3745 * Return a value representing the fourCC code associated to the
3746 * pixel format pix_fmt, or 0 if no associated fourCC code can be
3749 unsigned int avcodec_pix_fmt_to_codec_tag(enum PixelFormat pix_fmt);
3752 * Put a string representing the codec tag codec_tag in buf.
3754 * @param buf_size size in bytes of buf
3755 * @return the length of the string that would have been generated if
3756 * enough space had been available, excluding the trailing null
3758 size_t av_get_codec_tag_string(char *buf, size_t buf_size, unsigned int codec_tag);
3760 #define FF_LOSS_RESOLUTION 0x0001 /**< loss due to resolution change */
3761 #define FF_LOSS_DEPTH 0x0002 /**< loss due to color depth change */
3762 #define FF_LOSS_COLORSPACE 0x0004 /**< loss due to color space conversion */
3763 #define FF_LOSS_ALPHA 0x0008 /**< loss of alpha bits */
3764 #define FF_LOSS_COLORQUANT 0x0010 /**< loss due to color quantization */
3765 #define FF_LOSS_CHROMA 0x0020 /**< loss of chroma (e.g. RGB to gray conversion) */
3768 * Compute what kind of losses will occur when converting from one specific
3769 * pixel format to another.
3770 * When converting from one pixel format to another, information loss may occur.
3771 * For example, when converting from RGB24 to GRAY, the color information will
3772 * be lost. Similarly, other losses occur when converting from some formats to
3773 * other formats. These losses can involve loss of chroma, but also loss of
3774 * resolution, loss of color depth, loss due to the color space conversion, loss
3775 * of the alpha bits or loss due to color quantization.
3776 * avcodec_get_fix_fmt_loss() informs you about the various types of losses
3777 * which will occur when converting from one pixel format to another.
3779 * @param[in] dst_pix_fmt destination pixel format
3780 * @param[in] src_pix_fmt source pixel format
3781 * @param[in] has_alpha Whether the source pixel format alpha channel is used.
3782 * @return Combination of flags informing you what kind of losses will occur
3783 * (maximum loss for an invalid dst_pix_fmt).
3785 int avcodec_get_pix_fmt_loss(enum PixelFormat dst_pix_fmt, enum PixelFormat src_pix_fmt,
3789 * Find the best pixel format to convert to given a certain source pixel
3790 * format. When converting from one pixel format to another, information loss
3791 * may occur. For example, when converting from RGB24 to GRAY, the color
3792 * information will be lost. Similarly, other losses occur when converting from
3793 * some formats to other formats. avcodec_find_best_pix_fmt() searches which of
3794 * the given pixel formats should be used to suffer the least amount of loss.
3795 * The pixel formats from which it chooses one, are determined by the
3796 * pix_fmt_mask parameter.
3798 * Note, only the first 64 pixel formats will fit in pix_fmt_mask.
3801 * src_pix_fmt = PIX_FMT_YUV420P;
3802 * pix_fmt_mask = (1 << PIX_FMT_YUV422P) | (1 << PIX_FMT_RGB24);
3803 * dst_pix_fmt = avcodec_find_best_pix_fmt(pix_fmt_mask, src_pix_fmt, alpha, &loss);
3806 * @param[in] pix_fmt_mask bitmask determining which pixel format to choose from
3807 * @param[in] src_pix_fmt source pixel format
3808 * @param[in] has_alpha Whether the source pixel format alpha channel is used.
3809 * @param[out] loss_ptr Combination of flags informing you what kind of losses will occur.
3810 * @return The best pixel format to convert to or -1 if none was found.
3812 enum PixelFormat avcodec_find_best_pix_fmt(int64_t pix_fmt_mask, enum PixelFormat src_pix_fmt,
3813 int has_alpha, int *loss_ptr);
3816 * Find the best pixel format to convert to given a certain source pixel
3817 * format and a selection of two destination pixel formats. When converting from
3818 * one pixel format to another, information loss may occur. For example, when converting
3819 * from RGB24 to GRAY, the color information will be lost. Similarly, other losses occur when
3820 * converting from some formats to other formats. avcodec_find_best_pix_fmt2() selects which of
3821 * the given pixel formats should be used to suffer the least amount of loss.
3823 * If one of the destination formats is PIX_FMT_NONE the other pixel format (if valid) will be
3827 * src_pix_fmt = PIX_FMT_YUV420P;
3828 * dst_pix_fmt1= PIX_FMT_RGB24;
3829 * dst_pix_fmt2= PIX_FMT_GRAY8;
3830 * dst_pix_fmt3= PIX_FMT_RGB8;
3831 * loss= FF_LOSS_CHROMA; // don't care about chroma loss, so chroma loss will be ignored.
3832 * dst_pix_fmt = avcodec_find_best_pix_fmt2(dst_pix_fmt1, dst_pix_fmt2, src_pix_fmt, alpha, &loss);
3833 * dst_pix_fmt = avcodec_find_best_pix_fmt2(dst_pix_fmt, dst_pix_fmt3, src_pix_fmt, alpha, &loss);
3836 * @param[in] dst_pix_fmt1 One of the two destination pixel formats to choose from
3837 * @param[in] dst_pix_fmt2 The other of the two destination pixel formats to choose from
3838 * @param[in] src_pix_fmt Source pixel format
3839 * @param[in] has_alpha Whether the source pixel format alpha channel is used.
3840 * @param[in, out] loss_ptr Combination of loss flags. In: selects which of the losses to ignore, i.e.
3841 * NULL or value of zero means we care about all losses. Out: the loss
3842 * that occurs when converting from src to selected dst pixel format.
3843 * @return The best pixel format to convert to or -1 if none was found.
3845 enum PixelFormat avcodec_find_best_pix_fmt2(enum PixelFormat dst_pix_fmt1, enum PixelFormat dst_pix_fmt2,
3846 enum PixelFormat src_pix_fmt, int has_alpha, int *loss_ptr);
3848 #if FF_API_GET_ALPHA_INFO
3849 #define FF_ALPHA_TRANSP 0x0001 /* image has some totally transparent pixels */
3850 #define FF_ALPHA_SEMI_TRANSP 0x0002 /* image has some transparent pixels */
3853 * Tell if an image really has transparent alpha values.
3854 * @return ored mask of FF_ALPHA_xxx constants
3856 attribute_deprecated
3857 int img_get_alpha_info(const AVPicture *src,
3858 enum PixelFormat pix_fmt, int width, int height);
3861 /* deinterlace a picture */
3862 /* deinterlace - if not supported return -1 */
3863 int avpicture_deinterlace(AVPicture *dst, const AVPicture *src,
3864 enum PixelFormat pix_fmt, int width, int height);
3866 /* external high level API */
3869 * If c is NULL, returns the first registered codec,
3870 * if c is non-NULL, returns the next registered codec after c,
3871 * or NULL if c is the last one.
3873 AVCodec *av_codec_next(AVCodec *c);
3876 * Return the LIBAVCODEC_VERSION_INT constant.
3878 unsigned avcodec_version(void);
3881 * Return the libavcodec build-time configuration.
3883 const char *avcodec_configuration(void);
3886 * Return the libavcodec license.
3888 const char *avcodec_license(void);
3890 #if FF_API_AVCODEC_INIT
3892 * @deprecated this function is called automatically from avcodec_register()
3893 * and avcodec_register_all(), there is no need to call it manually
3895 attribute_deprecated
3896 void avcodec_init(void);
3900 * Register the codec codec and initialize libavcodec.
3902 * @warning either this function or avcodec_register_all() must be called
3903 * before any other libavcodec functions.
3905 * @see avcodec_register_all()
3907 void avcodec_register(AVCodec *codec);
3910 * Find a registered encoder with a matching codec ID.
3912 * @param id CodecID of the requested encoder
3913 * @return An encoder if one was found, NULL otherwise.
3915 AVCodec *avcodec_find_encoder(enum CodecID id);
3918 * Find a registered encoder with the specified name.
3920 * @param name name of the requested encoder
3921 * @return An encoder if one was found, NULL otherwise.
3923 AVCodec *avcodec_find_encoder_by_name(const char *name);
3926 * Find a registered decoder with a matching codec ID.
3928 * @param id CodecID of the requested decoder
3929 * @return A decoder if one was found, NULL otherwise.
3931 AVCodec *avcodec_find_decoder(enum CodecID id);
3934 * Find a registered decoder with the specified name.
3936 * @param name name of the requested decoder
3937 * @return A decoder if one was found, NULL otherwise.
3939 AVCodec *avcodec_find_decoder_by_name(const char *name);
3940 void avcodec_string(char *buf, int buf_size, AVCodecContext *enc, int encode);
3943 * Return a name for the specified profile, if available.
3945 * @param codec the codec that is searched for the given profile
3946 * @param profile the profile value for which a name is requested
3947 * @return A name for the profile if found, NULL otherwise.
3949 const char *av_get_profile_name(const AVCodec *codec, int profile);
3951 #if FF_API_ALLOC_CONTEXT
3953 * Set the fields of the given AVCodecContext to default values.
3955 * @param s The AVCodecContext of which the fields should be set to default values.
3956 * @deprecated use avcodec_get_context_defaults3
3958 attribute_deprecated
3959 void avcodec_get_context_defaults(AVCodecContext *s);
3961 /** THIS FUNCTION IS NOT YET PART OF THE PUBLIC API!
3962 * we WILL change its arguments and name a few times! */
3963 attribute_deprecated
3964 void avcodec_get_context_defaults2(AVCodecContext *s, enum AVMediaType);
3968 * Set the fields of the given AVCodecContext to default values corresponding
3969 * to the given codec (defaults may be codec-dependent).
3971 * Do not call this function if a non-NULL codec has been passed
3972 * to avcodec_alloc_context3() that allocated this AVCodecContext.
3973 * If codec is non-NULL, it is illegal to call avcodec_open2() with a
3974 * different codec on this AVCodecContext.
3976 int avcodec_get_context_defaults3(AVCodecContext *s, AVCodec *codec);
3978 #if FF_API_ALLOC_CONTEXT
3980 * Allocate an AVCodecContext and set its fields to default values. The
3981 * resulting struct can be deallocated by simply calling av_free().
3983 * @return An AVCodecContext filled with default values or NULL on failure.
3984 * @see avcodec_get_context_defaults
3986 * @deprecated use avcodec_alloc_context3()
3988 attribute_deprecated
3989 AVCodecContext *avcodec_alloc_context(void);
3991 /** THIS FUNCTION IS NOT YET PART OF THE PUBLIC API!
3992 * we WILL change its arguments and name a few times! */
3993 attribute_deprecated
3994 AVCodecContext *avcodec_alloc_context2(enum AVMediaType);
3998 * Allocate an AVCodecContext and set its fields to default values. The
3999 * resulting struct can be deallocated by simply calling av_free().
4001 * @param codec if non-NULL, allocate private data and initialize defaults
4002 * for the given codec. It is illegal to then call avcodec_open2()
4003 * with a different codec.
4005 * @return An AVCodecContext filled with default values or NULL on failure.
4006 * @see avcodec_get_context_defaults
4008 AVCodecContext *avcodec_alloc_context3(AVCodec *codec);
4011 * Copy the settings of the source AVCodecContext into the destination
4012 * AVCodecContext. The resulting destination codec context will be
4013 * unopened, i.e. you are required to call avcodec_open2() before you
4014 * can use this AVCodecContext to decode/encode video/audio data.
4016 * @param dest target codec context, should be initialized with
4017 * avcodec_alloc_context3(), but otherwise uninitialized
4018 * @param src source codec context
4019 * @return AVERROR() on error (e.g. memory allocation error), 0 on success
4021 int avcodec_copy_context(AVCodecContext *dest, const AVCodecContext *src);
4024 * Set the fields of the given AVFrame to default values.
4026 * @param pic The AVFrame of which the fields should be set to default values.
4028 void avcodec_get_frame_defaults(AVFrame *pic);
4031 * Allocate an AVFrame and set its fields to default values. The resulting
4032 * struct can be deallocated by simply calling av_free().
4034 * @return An AVFrame filled with default values or NULL on failure.
4035 * @see avcodec_get_frame_defaults
4037 AVFrame *avcodec_alloc_frame(void);
4039 int avcodec_default_get_buffer(AVCodecContext *s, AVFrame *pic);
4040 void avcodec_default_release_buffer(AVCodecContext *s, AVFrame *pic);
4041 int avcodec_default_reget_buffer(AVCodecContext *s, AVFrame *pic);
4044 * Return the amount of padding in pixels which the get_buffer callback must
4045 * provide around the edge of the image for codecs which do not have the
4046 * CODEC_FLAG_EMU_EDGE flag.
4048 * @return Required padding in pixels.
4050 unsigned avcodec_get_edge_width(void);
4052 * Modify width and height values so that they will result in a memory
4053 * buffer that is acceptable for the codec if you do not use any horizontal
4056 * May only be used if a codec with CODEC_CAP_DR1 has been opened.
4057 * If CODEC_FLAG_EMU_EDGE is not set, the dimensions must have been increased
4058 * according to avcodec_get_edge_width() before.
4060 void avcodec_align_dimensions(AVCodecContext *s, int *width, int *height);
4062 * Modify width and height values so that they will result in a memory
4063 * buffer that is acceptable for the codec if you also ensure that all
4064 * line sizes are a multiple of the respective linesize_align[i].
4066 * May only be used if a codec with CODEC_CAP_DR1 has been opened.
4067 * If CODEC_FLAG_EMU_EDGE is not set, the dimensions must have been increased
4068 * according to avcodec_get_edge_width() before.
4070 void avcodec_align_dimensions2(AVCodecContext *s, int *width, int *height,
4071 int linesize_align[AV_NUM_DATA_POINTERS]);
4073 enum PixelFormat avcodec_default_get_format(struct AVCodecContext *s, const enum PixelFormat * fmt);
4075 #if FF_API_THREAD_INIT
4077 * @deprecated Set s->thread_count before calling avcodec_open2() instead of calling this.
4079 attribute_deprecated
4080 int avcodec_thread_init(AVCodecContext *s, int thread_count);
4083 int avcodec_default_execute(AVCodecContext *c, int (*func)(AVCodecContext *c2, void *arg2),void *arg, int *ret, int count, int size);
4084 int avcodec_default_execute2(AVCodecContext *c, int (*func)(AVCodecContext *c2, void *arg2, int, int),void *arg, int *ret, int count);
4085 //FIXME func typedef
4087 #if FF_API_AVCODEC_OPEN
4089 * Initialize the AVCodecContext to use the given AVCodec. Prior to using this
4090 * function the context has to be allocated.
4092 * The functions avcodec_find_decoder_by_name(), avcodec_find_encoder_by_name(),
4093 * avcodec_find_decoder() and avcodec_find_encoder() provide an easy way for
4094 * retrieving a codec.
4096 * @warning This function is not thread safe!
4099 * avcodec_register_all();
4100 * codec = avcodec_find_decoder(CODEC_ID_H264);
4104 * context = avcodec_alloc_context3(codec);
4106 * if (avcodec_open(context, codec) < 0)
4110 * @param avctx The context which will be set up to use the given codec.
4111 * @param codec The codec to use within the context.
4112 * @return zero on success, a negative value on error
4113 * @see avcodec_alloc_context3, avcodec_find_decoder, avcodec_find_encoder, avcodec_close
4115 * @deprecated use avcodec_open2
4117 attribute_deprecated
4118 int avcodec_open(AVCodecContext *avctx, AVCodec *codec);
4122 * Initialize the AVCodecContext to use the given AVCodec. Prior to using this
4123 * function the context has to be allocated with avcodec_alloc_context3().
4125 * The functions avcodec_find_decoder_by_name(), avcodec_find_encoder_by_name(),
4126 * avcodec_find_decoder() and avcodec_find_encoder() provide an easy way for
4127 * retrieving a codec.
4129 * @warning This function is not thread safe!
4132 * avcodec_register_all();
4133 * av_dict_set(&opts, "b", "2.5M", 0);
4134 * codec = avcodec_find_decoder(CODEC_ID_H264);
4138 * context = avcodec_alloc_context3(codec);
4140 * if (avcodec_open2(context, codec, opts) < 0)
4144 * @param avctx The context to initialize.
4145 * @param options A dictionary filled with AVCodecContext and codec-private options.
4146 * On return this object will be filled with options that were not found.
4148 * @return zero on success, a negative value on error
4149 * @see avcodec_alloc_context3(), avcodec_find_decoder(), avcodec_find_encoder(),
4150 * av_dict_set(), av_opt_find().
4152 int avcodec_open2(AVCodecContext *avctx, AVCodec *codec, AVDictionary **options);
4154 #if FF_API_OLD_DECODE_AUDIO
4156 * Wrapper function which calls avcodec_decode_audio4.
4158 * @deprecated Use avcodec_decode_audio4 instead.
4160 * Decode the audio frame of size avpkt->size from avpkt->data into samples.
4161 * Some decoders may support multiple frames in a single AVPacket, such
4162 * decoders would then just decode the first frame. In this case,
4163 * avcodec_decode_audio3 has to be called again with an AVPacket that contains
4164 * the remaining data in order to decode the second frame etc.
4166 * could be outputted, frame_size_ptr is zero. Otherwise, it is the
4167 * decompressed frame size in bytes.
4169 * @warning You must set frame_size_ptr to the allocated size of the
4170 * output buffer before calling avcodec_decode_audio3().
4172 * @warning The input buffer must be FF_INPUT_BUFFER_PADDING_SIZE larger than
4173 * the actual read bytes because some optimized bitstream readers read 32 or 64
4174 * bits at once and could read over the end.
4176 * @warning The end of the input buffer avpkt->data should be set to 0 to ensure that
4177 * no overreading happens for damaged MPEG streams.
4179 * @note You might have to align the input buffer avpkt->data and output buffer
4180 * samples. The alignment requirements depend on the CPU: On some CPUs it isn't
4181 * necessary at all, on others it won't work at all if not aligned and on others
4182 * it will work but it will have an impact on performance.
4184 * In practice, avpkt->data should have 4 byte alignment at minimum and
4185 * samples should be 16 byte aligned unless the CPU doesn't need it
4186 * (AltiVec and SSE do).
4188 * @note Codecs which have the CODEC_CAP_DELAY capability set have a delay
4189 * between input and output, these need to be fed with avpkt->data=NULL,
4190 * avpkt->size=0 at the end to return the remaining frames.
4192 * @param avctx the codec context
4193 * @param[out] samples the output buffer, sample type in avctx->sample_fmt
4194 * If the sample format is planar, each channel plane will
4195 * be the same size, with no padding between channels.
4196 * @param[in,out] frame_size_ptr the output buffer size in bytes
4197 * @param[in] avpkt The input AVPacket containing the input buffer.
4198 * You can create such packet with av_init_packet() and by then setting
4199 * data and size, some decoders might in addition need other fields.
4200 * All decoders are designed to use the least fields possible though.
4201 * @return On error a negative value is returned, otherwise the number of bytes
4202 * used or zero if no frame data was decompressed (used) from the input AVPacket.
4204 attribute_deprecated int avcodec_decode_audio3(AVCodecContext *avctx, int16_t *samples,
4205 int *frame_size_ptr,
4210 * Decode the audio frame of size avpkt->size from avpkt->data into frame.
4212 * Some decoders may support multiple frames in a single AVPacket. Such
4213 * decoders would then just decode the first frame. In this case,
4214 * avcodec_decode_audio4 has to be called again with an AVPacket containing
4215 * the remaining data in order to decode the second frame, etc...
4216 * Even if no frames are returned, the packet needs to be fed to the decoder
4217 * with remaining data until it is completely consumed or an error occurs.
4219 * @warning The input buffer, avpkt->data must be FF_INPUT_BUFFER_PADDING_SIZE
4220 * larger than the actual read bytes because some optimized bitstream
4221 * readers read 32 or 64 bits at once and could read over the end.
4223 * @note You might have to align the input buffer. The alignment requirements
4224 * depend on the CPU and the decoder.
4226 * @param avctx the codec context
4227 * @param[out] frame The AVFrame in which to store decoded audio samples.
4228 * Decoders request a buffer of a particular size by setting
4229 * AVFrame.nb_samples prior to calling get_buffer(). The
4230 * decoder may, however, only utilize part of the buffer by
4231 * setting AVFrame.nb_samples to a smaller value in the
4233 * @param[out] got_frame_ptr Zero if no frame could be decoded, otherwise it is
4235 * @param[in] avpkt The input AVPacket containing the input buffer.
4236 * At least avpkt->data and avpkt->size should be set. Some
4237 * decoders might also require additional fields to be set.
4238 * @return A negative error code is returned if an error occurred during
4239 * decoding, otherwise the number of bytes consumed from the input
4240 * AVPacket is returned.
4242 int avcodec_decode_audio4(AVCodecContext *avctx, AVFrame *frame,
4243 int *got_frame_ptr, AVPacket *avpkt);
4246 * Decode the video frame of size avpkt->size from avpkt->data into picture.
4247 * Some decoders may support multiple frames in a single AVPacket, such
4248 * decoders would then just decode the first frame.
4250 * @warning The input buffer must be FF_INPUT_BUFFER_PADDING_SIZE larger than
4251 * the actual read bytes because some optimized bitstream readers read 32 or 64
4252 * bits at once and could read over the end.
4254 * @warning The end of the input buffer buf should be set to 0 to ensure that
4255 * no overreading happens for damaged MPEG streams.
4257 * @note You might have to align the input buffer avpkt->data.
4258 * The alignment requirements depend on the CPU: on some CPUs it isn't
4259 * necessary at all, on others it won't work at all if not aligned and on others
4260 * it will work but it will have an impact on performance.
4262 * In practice, avpkt->data should have 4 byte alignment at minimum.
4264 * @note Codecs which have the CODEC_CAP_DELAY capability set have a delay
4265 * between input and output, these need to be fed with avpkt->data=NULL,
4266 * avpkt->size=0 at the end to return the remaining frames.
4268 * @param avctx the codec context
4269 * @param[out] picture The AVFrame in which the decoded video frame will be stored.
4270 * Use avcodec_alloc_frame to get an AVFrame, the codec will
4271 * allocate memory for the actual bitmap.
4272 * with default get/release_buffer(), the decoder frees/reuses the bitmap as it sees fit.
4273 * with overridden get/release_buffer() (needs CODEC_CAP_DR1) the user decides into what buffer the decoder
4274 * decodes and the decoder tells the user once it does not need the data anymore,
4275 * the user app can at this point free/reuse/keep the memory as it sees fit.
4277 * @param[in] avpkt The input AVpacket containing the input buffer.
4278 * You can create such packet with av_init_packet() and by then setting
4279 * data and size, some decoders might in addition need other fields like
4280 * flags&AV_PKT_FLAG_KEY. All decoders are designed to use the least
4282 * @param[in,out] got_picture_ptr Zero if no frame could be decompressed, otherwise, it is nonzero.
4283 * @return On error a negative value is returned, otherwise the number of bytes
4284 * used or zero if no frame could be decompressed.
4286 int avcodec_decode_video2(AVCodecContext *avctx, AVFrame *picture,
4287 int *got_picture_ptr,
4291 * Decode a subtitle message.
4292 * Return a negative value on error, otherwise return the number of bytes used.
4293 * If no subtitle could be decompressed, got_sub_ptr is zero.
4294 * Otherwise, the subtitle is stored in *sub.
4295 * Note that CODEC_CAP_DR1 is not available for subtitle codecs. This is for
4296 * simplicity, because the performance difference is expect to be negligible
4297 * and reusing a get_buffer written for video codecs would probably perform badly
4298 * due to a potentially very different allocation pattern.
4300 * @param avctx the codec context
4301 * @param[out] sub The AVSubtitle in which the decoded subtitle will be stored, must be
4302 freed with avsubtitle_free if *got_sub_ptr is set.
4303 * @param[in,out] got_sub_ptr Zero if no subtitle could be decompressed, otherwise, it is nonzero.
4304 * @param[in] avpkt The input AVPacket containing the input buffer.
4306 int avcodec_decode_subtitle2(AVCodecContext *avctx, AVSubtitle *sub,
4311 * Free all allocated data in the given subtitle struct.
4313 * @param sub AVSubtitle to free.
4315 void avsubtitle_free(AVSubtitle *sub);
4318 * Encode an audio frame from samples into buf.
4320 * @note The output buffer should be at least FF_MIN_BUFFER_SIZE bytes large.
4321 * However, for PCM audio the user will know how much space is needed
4322 * because it depends on the value passed in buf_size as described
4323 * below. In that case a lower value can be used.
4325 * @param avctx the codec context
4326 * @param[out] buf the output buffer
4327 * @param[in] buf_size the output buffer size
4328 * @param[in] samples the input buffer containing the samples
4329 * The number of samples read from this buffer is frame_size*channels,
4330 * both of which are defined in avctx.
4331 * For PCM audio the number of samples read from samples is equal to
4332 * buf_size * input_sample_size / output_sample_size.
4333 * @return On error a negative value is returned, on success zero or the number
4334 * of bytes used to encode the data read from the input buffer.
4336 int avcodec_encode_audio(AVCodecContext *avctx, uint8_t *buf, int buf_size,
4337 const short *samples);
4340 * Encode a video frame from pict into buf.
4341 * The input picture should be
4342 * stored using a specific format, namely avctx.pix_fmt.
4344 * @param avctx the codec context
4345 * @param[out] buf the output buffer for the bitstream of encoded frame
4346 * @param[in] buf_size the size of the output buffer in bytes
4347 * @param[in] pict the input picture to encode
4348 * @return On error a negative value is returned, on success zero or the number
4349 * of bytes used from the output buffer.
4351 int avcodec_encode_video(AVCodecContext *avctx, uint8_t *buf, int buf_size,
4352 const AVFrame *pict);
4353 int avcodec_encode_subtitle(AVCodecContext *avctx, uint8_t *buf, int buf_size,
4354 const AVSubtitle *sub);
4356 int avcodec_close(AVCodecContext *avctx);
4359 * Register all the codecs, parsers and bitstream filters which were enabled at
4360 * configuration time. If you do not call this function you can select exactly
4361 * which formats you want to support, by using the individual registration
4364 * @see avcodec_register
4365 * @see av_register_codec_parser
4366 * @see av_register_bitstream_filter
4368 void avcodec_register_all(void);
4371 * Flush buffers, should be called when seeking or when switching to a different stream.
4373 void avcodec_flush_buffers(AVCodecContext *avctx);
4375 void avcodec_default_free_buffers(AVCodecContext *s);
4377 /* misc useful functions */
4379 #if FF_API_OLD_FF_PICT_TYPES
4381 * Return a single letter to describe the given picture type pict_type.
4383 * @param[in] pict_type the picture type
4384 * @return A single character representing the picture type.
4385 * @deprecated Use av_get_picture_type_char() instead.
4387 attribute_deprecated
4388 char av_get_pict_type_char(int pict_type);
4392 * Return codec bits per sample.
4394 * @param[in] codec_id the codec
4395 * @return Number of bits per sample or zero if unknown for the given codec.
4397 int av_get_bits_per_sample(enum CodecID codec_id);
4399 #if FF_API_OLD_SAMPLE_FMT
4401 * @deprecated Use av_get_bytes_per_sample() instead.
4403 attribute_deprecated
4404 int av_get_bits_per_sample_format(enum AVSampleFormat sample_fmt);
4408 typedef struct AVCodecParserContext {
4410 struct AVCodecParser *parser;
4411 int64_t frame_offset; /* offset of the current frame */
4412 int64_t cur_offset; /* current offset
4413 (incremented by each av_parser_parse()) */
4414 int64_t next_frame_offset; /* offset of the next frame */
4416 int pict_type; /* XXX: Put it back in AVCodecContext. */
4418 * This field is used for proper frame duration computation in lavf.
4419 * It signals, how much longer the frame duration of the current frame
4420 * is compared to normal frame duration.
4422 * frame_duration = (1 + repeat_pict) * time_base
4424 * It is used by codecs like H.264 to display telecined material.
4426 int repeat_pict; /* XXX: Put it back in AVCodecContext. */
4427 int64_t pts; /* pts of the current frame */
4428 int64_t dts; /* dts of the current frame */
4433 int fetch_timestamp;
4435 #define AV_PARSER_PTS_NB 4
4436 int cur_frame_start_index;
4437 int64_t cur_frame_offset[AV_PARSER_PTS_NB];
4438 int64_t cur_frame_pts[AV_PARSER_PTS_NB];
4439 int64_t cur_frame_dts[AV_PARSER_PTS_NB];
4442 #define PARSER_FLAG_COMPLETE_FRAMES 0x0001
4443 #define PARSER_FLAG_ONCE 0x0002
4444 /// Set if the parser has a valid file offset
4445 #define PARSER_FLAG_FETCHED_OFFSET 0x0004
4447 int64_t offset; ///< byte offset from starting packet start
4448 int64_t cur_frame_end[AV_PARSER_PTS_NB];
4451 * Set by parser to 1 for key frames and 0 for non-key frames.
4452 * It is initialized to -1, so if the parser doesn't set this flag,
4453 * old-style fallback using AV_PICTURE_TYPE_I picture type as key frames
4459 * Time difference in stream time base units from the pts of this
4460 * packet to the point at which the output from the decoder has converged
4461 * independent from the availability of previous frames. That is, the
4462 * frames are virtually identical no matter if decoding started from
4463 * the very first frame or from this keyframe.
4464 * Is AV_NOPTS_VALUE if unknown.
4465 * This field is not the display duration of the current frame.
4466 * This field has no meaning if the packet does not have AV_PKT_FLAG_KEY
4469 * The purpose of this field is to allow seeking in streams that have no
4470 * keyframes in the conventional sense. It corresponds to the
4471 * recovery point SEI in H.264 and match_time_delta in NUT. It is also
4472 * essential for some types of subtitle streams to ensure that all
4473 * subtitles are correctly displayed after seeking.
4475 int64_t convergence_duration;
4477 // Timestamp generation support:
4479 * Synchronization point for start of timestamp generation.
4481 * Set to >0 for sync point, 0 for no sync point and <0 for undefined
4484 * For example, this corresponds to presence of H.264 buffering period
4490 * Offset of the current timestamp against last timestamp sync point in
4491 * units of AVCodecContext.time_base.
4493 * Set to INT_MIN when dts_sync_point unused. Otherwise, it must
4494 * contain a valid timestamp offset.
4496 * Note that the timestamp of sync point has usually a nonzero
4497 * dts_ref_dts_delta, which refers to the previous sync point. Offset of
4498 * the next frame after timestamp sync point will be usually 1.
4500 * For example, this corresponds to H.264 cpb_removal_delay.
4502 int dts_ref_dts_delta;
4505 * Presentation delay of current frame in units of AVCodecContext.time_base.
4507 * Set to INT_MIN when dts_sync_point unused. Otherwise, it must
4508 * contain valid non-negative timestamp delta (presentation time of a frame
4509 * must not lie in the past).
4511 * This delay represents the difference between decoding and presentation
4512 * time of the frame.
4514 * For example, this corresponds to H.264 dpb_output_delay.
4519 * Position of the packet in file.
4521 * Analogous to cur_frame_pts/dts
4523 int64_t cur_frame_pos[AV_PARSER_PTS_NB];
4526 * Byte position of currently parsed frame in stream.
4531 * Previous frame byte position.
4534 } AVCodecParserContext;
4536 typedef struct AVCodecParser {
4537 int codec_ids[5]; /* several codec IDs are permitted */
4539 int (*parser_init)(AVCodecParserContext *s);
4540 int (*parser_parse)(AVCodecParserContext *s,
4541 AVCodecContext *avctx,
4542 const uint8_t **poutbuf, int *poutbuf_size,
4543 const uint8_t *buf, int buf_size);
4544 void (*parser_close)(AVCodecParserContext *s);
4545 int (*split)(AVCodecContext *avctx, const uint8_t *buf, int buf_size);
4546 struct AVCodecParser *next;
4549 AVCodecParser *av_parser_next(AVCodecParser *c);
4551 void av_register_codec_parser(AVCodecParser *parser);
4552 AVCodecParserContext *av_parser_init(int codec_id);
4557 * @param s parser context.
4558 * @param avctx codec context.
4559 * @param poutbuf set to pointer to parsed buffer or NULL if not yet finished.
4560 * @param poutbuf_size set to size of parsed buffer or zero if not yet finished.
4561 * @param buf input buffer.
4562 * @param buf_size input length, to signal EOF, this should be 0 (so that the last frame can be output).
4563 * @param pts input presentation timestamp.
4564 * @param dts input decoding timestamp.
4565 * @param pos input byte position in stream.
4566 * @return the number of bytes of the input bitstream used.
4571 * len = av_parser_parse2(myparser, AVCodecContext, &data, &size,
4578 * decode_frame(data, size);
4582 int av_parser_parse2(AVCodecParserContext *s,
4583 AVCodecContext *avctx,
4584 uint8_t **poutbuf, int *poutbuf_size,
4585 const uint8_t *buf, int buf_size,
4586 int64_t pts, int64_t dts,
4589 int av_parser_change(AVCodecParserContext *s,
4590 AVCodecContext *avctx,
4591 uint8_t **poutbuf, int *poutbuf_size,
4592 const uint8_t *buf, int buf_size, int keyframe);
4593 void av_parser_close(AVCodecParserContext *s);
4596 typedef struct AVBitStreamFilterContext {
4598 struct AVBitStreamFilter *filter;
4599 AVCodecParserContext *parser;
4600 struct AVBitStreamFilterContext *next;
4601 } AVBitStreamFilterContext;
4604 typedef struct AVBitStreamFilter {
4607 int (*filter)(AVBitStreamFilterContext *bsfc,
4608 AVCodecContext *avctx, const char *args,
4609 uint8_t **poutbuf, int *poutbuf_size,
4610 const uint8_t *buf, int buf_size, int keyframe);
4611 void (*close)(AVBitStreamFilterContext *bsfc);
4612 struct AVBitStreamFilter *next;
4613 } AVBitStreamFilter;
4615 void av_register_bitstream_filter(AVBitStreamFilter *bsf);
4616 AVBitStreamFilterContext *av_bitstream_filter_init(const char *name);
4617 int av_bitstream_filter_filter(AVBitStreamFilterContext *bsfc,
4618 AVCodecContext *avctx, const char *args,
4619 uint8_t **poutbuf, int *poutbuf_size,
4620 const uint8_t *buf, int buf_size, int keyframe);
4621 void av_bitstream_filter_close(AVBitStreamFilterContext *bsf);
4623 AVBitStreamFilter *av_bitstream_filter_next(AVBitStreamFilter *f);
4628 * Reallocate the given block if it is not large enough, otherwise do nothing.
4632 void *av_fast_realloc(void *ptr, unsigned int *size, size_t min_size);
4635 * Allocate a buffer, reusing the given one if large enough.
4637 * Contrary to av_fast_realloc the current buffer contents might not be
4638 * preserved and on error the old buffer is freed, thus no special
4639 * handling to avoid memleaks is necessary.
4641 * @param ptr pointer to pointer to already allocated buffer, overwritten with pointer to new buffer
4642 * @param size size of the buffer *ptr points to
4643 * @param min_size minimum size of *ptr buffer after returning, *ptr will be NULL and
4644 * *size 0 if an error occurred.
4646 void av_fast_malloc(void *ptr, unsigned int *size, size_t min_size);
4649 * Copy image src to dst. Wraps av_picture_data_copy() above.
4651 void av_picture_copy(AVPicture *dst, const AVPicture *src,
4652 enum PixelFormat pix_fmt, int width, int height);
4655 * Crop image top and left side.
4657 int av_picture_crop(AVPicture *dst, const AVPicture *src,
4658 enum PixelFormat pix_fmt, int top_band, int left_band);
4663 int av_picture_pad(AVPicture *dst, const AVPicture *src, int height, int width, enum PixelFormat pix_fmt,
4664 int padtop, int padbottom, int padleft, int padright, int *color);
4667 * Encode extradata length to a buffer. Used by xiph codecs.
4669 * @param s buffer to write to; must be at least (v/255+1) bytes long
4670 * @param v size of extradata in bytes
4671 * @return number of bytes written to the buffer.
4673 unsigned int av_xiphlacing(unsigned char *s, unsigned int v);
4676 * Log a generic warning message about a missing feature. This function is
4677 * intended to be used internally by FFmpeg (libavcodec, libavformat, etc.)
4678 * only, and would normally not be used by applications.
4679 * @param[in] avc a pointer to an arbitrary struct of which the first field is
4680 * a pointer to an AVClass struct
4681 * @param[in] feature string containing the name of the missing feature
4682 * @param[in] want_sample indicates if samples are wanted which exhibit this feature.
4683 * If want_sample is non-zero, additional verbage will be added to the log
4684 * message which tells the user how to report samples to the development
4687 void av_log_missing_feature(void *avc, const char *feature, int want_sample);
4690 * Log a generic warning message asking for a sample. This function is
4691 * intended to be used internally by FFmpeg (libavcodec, libavformat, etc.)
4692 * only, and would normally not be used by applications.
4693 * @param[in] avc a pointer to an arbitrary struct of which the first field is
4694 * a pointer to an AVClass struct
4695 * @param[in] msg string containing an optional message, or NULL if no message
4697 void av_log_ask_for_sample(void *avc, const char *msg, ...) av_printf_format(2, 3);
4700 * Register the hardware accelerator hwaccel.
4702 void av_register_hwaccel(AVHWAccel *hwaccel);
4705 * If hwaccel is NULL, returns the first registered hardware accelerator,
4706 * if hwaccel is non-NULL, returns the next registered hardware accelerator
4707 * after hwaccel, or NULL if hwaccel is the last one.
4709 AVHWAccel *av_hwaccel_next(AVHWAccel *hwaccel);
4713 * Lock operation used by lockmgr
4716 AV_LOCK_CREATE, ///< Create a mutex
4717 AV_LOCK_OBTAIN, ///< Lock the mutex
4718 AV_LOCK_RELEASE, ///< Unlock the mutex
4719 AV_LOCK_DESTROY, ///< Free mutex resources
4723 * Register a user provided lock manager supporting the operations
4724 * specified by AVLockOp. mutex points to a (void *) where the
4725 * lockmgr should store/get a pointer to a user allocated mutex. It's
4726 * NULL upon AV_LOCK_CREATE and != NULL for all other ops.
4728 * @param cb User defined callback. Note: FFmpeg may invoke calls to this
4729 * callback during the call to av_lockmgr_register().
4730 * Thus, the application must be prepared to handle that.
4731 * If cb is set to NULL the lockmgr will be unregistered.
4732 * Also note that during unregistration the previously registered
4733 * lockmgr callback may also be invoked.
4735 int av_lockmgr_register(int (*cb)(void **mutex, enum AVLockOp op));
4738 * Get the type of the given codec.
4740 enum AVMediaType avcodec_get_type(enum CodecID codec_id);
4743 * Get the AVClass for AVCodecContext. It can be used in combination with
4744 * AV_OPT_SEARCH_FAKE_OBJ for examining options.
4746 * @see av_opt_find().
4748 const AVClass *avcodec_get_class(void);
4751 * Get the AVClass for AVFrame. It can be used in combination with
4752 * AV_OPT_SEARCH_FAKE_OBJ for examining options.
4754 * @see av_opt_find().
4756 const AVClass *avcodec_get_frame_class(void);
4758 #endif /* AVCODEC_AVCODEC_H */