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 "libavcore/samplefmt.h"
31 #include "libavutil/avutil.h"
32 #include "libavutil/cpu.h"
34 #define LIBAVCODEC_VERSION_MAJOR 52
35 #define LIBAVCODEC_VERSION_MINOR 99
36 #define LIBAVCODEC_VERSION_MICRO 1
38 #define LIBAVCODEC_VERSION_INT AV_VERSION_INT(LIBAVCODEC_VERSION_MAJOR, \
39 LIBAVCODEC_VERSION_MINOR, \
40 LIBAVCODEC_VERSION_MICRO)
41 #define LIBAVCODEC_VERSION AV_VERSION(LIBAVCODEC_VERSION_MAJOR, \
42 LIBAVCODEC_VERSION_MINOR, \
43 LIBAVCODEC_VERSION_MICRO)
44 #define LIBAVCODEC_BUILD LIBAVCODEC_VERSION_INT
46 #define LIBAVCODEC_IDENT "Lavc" AV_STRINGIFY(LIBAVCODEC_VERSION)
49 * Those FF_API_* defines are not part of public API.
50 * They may change, break or disappear at any time.
52 #ifndef FF_API_PALETTE_CONTROL
53 #define FF_API_PALETTE_CONTROL (LIBAVCODEC_VERSION_MAJOR < 54)
55 #ifndef FF_API_MM_FLAGS
56 #define FF_API_MM_FLAGS (LIBAVCODEC_VERSION_MAJOR < 53)
58 #ifndef FF_API_OPT_SHOW
59 #define FF_API_OPT_SHOW (LIBAVCODEC_VERSION_MAJOR < 53)
61 #ifndef FF_API_AUDIO_OLD
62 #define FF_API_AUDIO_OLD (LIBAVCODEC_VERSION_MAJOR < 53)
64 #ifndef FF_API_VIDEO_OLD
65 #define FF_API_VIDEO_OLD (LIBAVCODEC_VERSION_MAJOR < 53)
67 #ifndef FF_API_SUBTITLE_OLD
68 #define FF_API_SUBTITLE_OLD (LIBAVCODEC_VERSION_MAJOR < 53)
70 #ifndef FF_API_USE_LPC
71 #define FF_API_USE_LPC (LIBAVCODEC_VERSION_MAJOR < 53)
73 #ifndef FF_API_SET_STRING_OLD
74 #define FF_API_SET_STRING_OLD (LIBAVCODEC_VERSION_MAJOR < 53)
76 #ifndef FF_API_INOFFICIAL
77 #define FF_API_INOFFICIAL (LIBAVCODEC_VERSION_MAJOR < 53)
79 #ifndef FF_API_OLD_SAMPLE_FMT
80 #define FF_API_OLD_SAMPLE_FMT (LIBAVCODEC_VERSION_MAJOR < 53)
82 #ifndef FF_API_OLD_AUDIOCONVERT
83 #define FF_API_OLD_AUDIOCONVERT (LIBAVCODEC_VERSION_MAJOR < 53)
86 #if LIBAVCODEC_VERSION_MAJOR < 53
87 # define FF_INTERNALC_MEM_TYPE unsigned int
89 # define FF_INTERNALC_MEM_TYPE size_t
93 * Identify the syntax and semantics of the bitstream.
94 * The principle is roughly:
95 * Two decoders with the same ID can decode the same streams.
96 * Two encoders with the same ID can encode compatible streams.
97 * There may be slight deviations from the principle due to implementation
100 * If you add a codec ID to this list, add it so that
101 * 1. no value of a existing codec ID changes (that would break ABI),
102 * 2. it is as close as possible to similar codecs.
109 CODEC_ID_MPEG2VIDEO, ///< preferred ID for MPEG-1/2 video decoding
110 CODEC_ID_MPEG2VIDEO_XVMC,
147 CODEC_ID_INTERPLAY_VIDEO,
159 CODEC_ID_TRUEMOTION1,
170 #if LIBAVCODEC_VERSION_MAJOR < 53
189 CODEC_ID_TRUEMOTION2,
206 CODEC_ID_DSICINVIDEO,
207 CODEC_ID_TIERTEXSEQVIDEO,
216 CODEC_ID_BETHSOFTVID,
234 CODEC_ID_MOTIONPIXELS,
252 CODEC_ID_IFF_BYTERUN1,
263 /* various PCM "codecs" */
264 CODEC_ID_PCM_S16LE= 0x10000,
280 CODEC_ID_PCM_S24DAUD,
282 CODEC_ID_PCM_S16LE_PLANAR,
291 /* various ADPCM codecs */
292 CODEC_ID_ADPCM_IMA_QT= 0x11000,
293 CODEC_ID_ADPCM_IMA_WAV,
294 CODEC_ID_ADPCM_IMA_DK3,
295 CODEC_ID_ADPCM_IMA_DK4,
296 CODEC_ID_ADPCM_IMA_WS,
297 CODEC_ID_ADPCM_IMA_SMJPEG,
306 CODEC_ID_ADPCM_YAMAHA,
307 CODEC_ID_ADPCM_SBPRO_4,
308 CODEC_ID_ADPCM_SBPRO_3,
309 CODEC_ID_ADPCM_SBPRO_2,
311 CODEC_ID_ADPCM_IMA_AMV,
312 CODEC_ID_ADPCM_EA_R1,
313 CODEC_ID_ADPCM_EA_R3,
314 CODEC_ID_ADPCM_EA_R2,
315 CODEC_ID_ADPCM_IMA_EA_SEAD,
316 CODEC_ID_ADPCM_IMA_EA_EACS,
317 CODEC_ID_ADPCM_EA_XAS,
318 CODEC_ID_ADPCM_EA_MAXIS_XA,
319 CODEC_ID_ADPCM_IMA_ISS,
323 CODEC_ID_AMR_NB= 0x12000,
326 /* RealAudio codecs*/
327 CODEC_ID_RA_144= 0x13000,
330 /* various DPCM codecs */
331 CODEC_ID_ROQ_DPCM= 0x14000,
332 CODEC_ID_INTERPLAY_DPCM,
337 CODEC_ID_MP2= 0x15000,
338 CODEC_ID_MP3, ///< preferred ID for decoding MPEG audio layer 1, 2 or 3
356 CODEC_ID_WESTWOOD_SND1,
357 CODEC_ID_GSM, ///< as in Berlin toast format
365 CODEC_ID_DSICINAUDIO,
369 CODEC_ID_GSM_MS, /* as found in WAV */
378 CODEC_ID_WMALOSSLESS,
387 CODEC_ID_BINKAUDIO_RDFT,
388 CODEC_ID_BINKAUDIO_DCT,
391 /* subtitle codecs */
392 CODEC_ID_DVD_SUBTITLE= 0x17000,
393 CODEC_ID_DVB_SUBTITLE,
394 CODEC_ID_TEXT, ///< raw UTF-8 text
398 CODEC_ID_HDMV_PGS_SUBTITLE,
399 CODEC_ID_DVB_TELETEXT,
402 /* other specific kind of codecs (generally used for attachments) */
403 CODEC_ID_TTF= 0x18000,
405 CODEC_ID_PROBE= 0x19000, ///< codec_id is not known (like CODEC_ID_NONE) but lavf should attempt to identify it
407 CODEC_ID_MPEG2TS= 0x20000, /**< _FAKE_ codec to indicate a raw MPEG-2 TS
408 * stream (only used by libavformat) */
411 #if LIBAVCODEC_VERSION_MAJOR < 53
412 #define CodecType AVMediaType
414 #define CODEC_TYPE_UNKNOWN AVMEDIA_TYPE_UNKNOWN
415 #define CODEC_TYPE_VIDEO AVMEDIA_TYPE_VIDEO
416 #define CODEC_TYPE_AUDIO AVMEDIA_TYPE_AUDIO
417 #define CODEC_TYPE_DATA AVMEDIA_TYPE_DATA
418 #define CODEC_TYPE_SUBTITLE AVMEDIA_TYPE_SUBTITLE
419 #define CODEC_TYPE_ATTACHMENT AVMEDIA_TYPE_ATTACHMENT
420 #define CODEC_TYPE_NB AVMEDIA_TYPE_NB
423 #if FF_API_OLD_SAMPLE_FMT
424 #define SampleFormat AVSampleFormat
426 #define SAMPLE_FMT_NONE AV_SAMPLE_FMT_NONE
427 #define SAMPLE_FMT_U8 AV_SAMPLE_FMT_U8
428 #define SAMPLE_FMT_S16 AV_SAMPLE_FMT_S16
429 #define SAMPLE_FMT_S32 AV_SAMPLE_FMT_S32
430 #define SAMPLE_FMT_FLT AV_SAMPLE_FMT_FLT
431 #define SAMPLE_FMT_DBL AV_SAMPLE_FMT_DBL
432 #define SAMPLE_FMT_NB AV_SAMPLE_FMT_NB
435 #if FF_API_OLD_AUDIOCONVERT
436 #include "libavcore/audioconvert.h"
438 /* Audio channel masks */
439 #define CH_FRONT_LEFT AV_CH_FRONT_LEFT
440 #define CH_FRONT_RIGHT AV_CH_FRONT_RIGHT
441 #define CH_FRONT_CENTER AV_CH_FRONT_CENTER
442 #define CH_LOW_FREQUENCY AV_CH_LOW_FREQUENCY
443 #define CH_BACK_LEFT AV_CH_BACK_LEFT
444 #define CH_BACK_RIGHT AV_CH_BACK_RIGHT
445 #define CH_FRONT_LEFT_OF_CENTER AV_CH_FRONT_LEFT_OF_CENTER
446 #define CH_FRONT_RIGHT_OF_CENTER AV_CH_FRONT_RIGHT_OF_CENTER
447 #define CH_BACK_CENTER AV_CH_BACK_CENTER
448 #define CH_SIDE_LEFT AV_CH_SIDE_LEFT
449 #define CH_SIDE_RIGHT AV_CH_SIDE_RIGHT
450 #define CH_TOP_CENTER AV_CH_TOP_CENTER
451 #define CH_TOP_FRONT_LEFT AV_CH_TOP_FRONT_LEFT
452 #define CH_TOP_FRONT_CENTER AV_CH_TOP_FRONT_CENTER
453 #define CH_TOP_FRONT_RIGHT AV_CH_TOP_FRONT_RIGHT
454 #define CH_TOP_BACK_LEFT AV_CH_TOP_BACK_LEFT
455 #define CH_TOP_BACK_CENTER AV_CH_TOP_BACK_CENTER
456 #define CH_TOP_BACK_RIGHT AV_CH_TOP_BACK_RIGHT
457 #define CH_STEREO_LEFT AV_CH_STEREO_LEFT
458 #define CH_STEREO_RIGHT AV_CH_STEREO_RIGHT
460 /** Channel mask value used for AVCodecContext.request_channel_layout
461 to indicate that the user requests the channel order of the decoder output
462 to be the native codec channel order. */
463 #define CH_LAYOUT_NATIVE AV_CH_LAYOUT_NATIVE
465 /* Audio channel convenience macros */
466 #define CH_LAYOUT_MONO AV_CH_LAYOUT_MONO
467 #define CH_LAYOUT_STEREO AV_CH_LAYOUT_STEREO
468 #define CH_LAYOUT_2_1 AV_CH_LAYOUT_2_1
469 #define CH_LAYOUT_SURROUND AV_CH_LAYOUT_SURROUND
470 #define CH_LAYOUT_4POINT0 AV_CH_LAYOUT_4POINT0
471 #define CH_LAYOUT_2_2 AV_CH_LAYOUT_2_2
472 #define CH_LAYOUT_QUAD AV_CH_LAYOUT_QUAD
473 #define CH_LAYOUT_5POINT0 AV_CH_LAYOUT_5POINT0
474 #define CH_LAYOUT_5POINT1 AV_CH_LAYOUT_5POINT1
475 #define CH_LAYOUT_5POINT0_BACK AV_CH_LAYOUT_5POINT0_BACK
476 #define CH_LAYOUT_5POINT1_BACK AV_CH_LAYOUT_5POINT1_BACK
477 #define CH_LAYOUT_7POINT0 AV_CH_LAYOUT_7POINT0
478 #define CH_LAYOUT_7POINT1 AV_CH_LAYOUT_7POINT1
479 #define CH_LAYOUT_7POINT1_WIDE AV_CH_LAYOUT_7POINT1_WIDE
480 #define CH_LAYOUT_STEREO_DOWNMIX AV_CH_LAYOUT_STEREO_DOWNMIX
484 #define AVCODEC_MAX_AUDIO_FRAME_SIZE 192000 // 1 second of 48khz 32bit audio
487 * Required number of additionally allocated bytes at the end of the input bitstream for decoding.
488 * This is mainly needed because some optimized bitstream readers read
489 * 32 or 64 bit at once and could read over the end.<br>
490 * Note: If the first 23 bits of the additional bytes are not 0, then damaged
491 * MPEG bitstreams could cause overread and segfault.
493 #define FF_INPUT_BUFFER_PADDING_SIZE 8
496 * minimum encoding buffer size
497 * Used to avoid some checks during header writing.
499 #define FF_MIN_BUFFER_SIZE 16384
503 * motion estimation type.
506 ME_ZERO = 1, ///< no search, that is use 0,0 vector whenever one is needed
510 ME_EPZS, ///< enhanced predictive zonal search
511 ME_X1, ///< reserved for experiments
512 ME_HEX, ///< hexagon based search
513 ME_UMH, ///< uneven multi-hexagon search
514 ME_ITER, ///< iterative search
515 ME_TESA, ///< transformed exhaustive search algorithm
519 /* We leave some space between them for extensions (drop some
520 * keyframes for intra-only or drop just some bidir frames). */
521 AVDISCARD_NONE =-16, ///< discard nothing
522 AVDISCARD_DEFAULT= 0, ///< discard useless packets like 0 size packets in avi
523 AVDISCARD_NONREF = 8, ///< discard all non reference
524 AVDISCARD_BIDIR = 16, ///< discard all bidirectional frames
525 AVDISCARD_NONKEY = 32, ///< discard all frames except keyframes
526 AVDISCARD_ALL = 48, ///< discard all
529 enum AVColorPrimaries{
530 AVCOL_PRI_BT709 =1, ///< also ITU-R BT1361 / IEC 61966-2-4 / SMPTE RP177 Annex B
531 AVCOL_PRI_UNSPECIFIED=2,
533 AVCOL_PRI_BT470BG =5, ///< also ITU-R BT601-6 625 / ITU-R BT1358 625 / ITU-R BT1700 625 PAL & SECAM
534 AVCOL_PRI_SMPTE170M =6, ///< also ITU-R BT601-6 525 / ITU-R BT1358 525 / ITU-R BT1700 NTSC
535 AVCOL_PRI_SMPTE240M =7, ///< functionally identical to above
537 AVCOL_PRI_NB , ///< Not part of ABI
540 enum AVColorTransferCharacteristic{
541 AVCOL_TRC_BT709 =1, ///< also ITU-R BT1361
542 AVCOL_TRC_UNSPECIFIED=2,
543 AVCOL_TRC_GAMMA22 =4, ///< also ITU-R BT470M / ITU-R BT1700 625 PAL & SECAM
544 AVCOL_TRC_GAMMA28 =5, ///< also ITU-R BT470BG
545 AVCOL_TRC_NB , ///< Not part of ABI
550 AVCOL_SPC_BT709 =1, ///< also ITU-R BT1361 / IEC 61966-2-4 xvYCC709 / SMPTE RP177 Annex B
551 AVCOL_SPC_UNSPECIFIED=2,
553 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
554 AVCOL_SPC_SMPTE170M =6, ///< also ITU-R BT601-6 525 / ITU-R BT1358 525 / ITU-R BT1700 NTSC / functionally identical to above
555 AVCOL_SPC_SMPTE240M =7,
556 AVCOL_SPC_NB , ///< Not part of ABI
560 AVCOL_RANGE_UNSPECIFIED=0,
561 AVCOL_RANGE_MPEG =1, ///< the normal 219*2^(n-8) "MPEG" YUV ranges
562 AVCOL_RANGE_JPEG =2, ///< the normal 2^n-1 "JPEG" YUV ranges
563 AVCOL_RANGE_NB , ///< Not part of ABI
567 * X X 3 4 X X are luma samples,
568 * 1 2 1-6 are possible chroma positions
569 * X X 5 6 X 0 is undefined/unknown position
571 enum AVChromaLocation{
572 AVCHROMA_LOC_UNSPECIFIED=0,
573 AVCHROMA_LOC_LEFT =1, ///< mpeg2/4, h264 default
574 AVCHROMA_LOC_CENTER =2, ///< mpeg1, jpeg, h263
575 AVCHROMA_LOC_TOPLEFT =3, ///< DV
577 AVCHROMA_LOC_BOTTOMLEFT =5,
578 AVCHROMA_LOC_BOTTOM =6,
579 AVCHROMA_LOC_NB , ///< Not part of ABI
586 AV_LPC_TYPE_DEFAULT = -1, ///< use the codec default LPC type
587 AV_LPC_TYPE_NONE = 0, ///< do not use LPC prediction or use all zero coefficients
588 AV_LPC_TYPE_FIXED = 1, ///< fixed LPC coefficients
589 AV_LPC_TYPE_LEVINSON = 2, ///< Levinson-Durbin recursion
590 AV_LPC_TYPE_CHOLESKY = 3, ///< Cholesky factorization
591 AV_LPC_TYPE_NB , ///< Not part of ABI
594 typedef struct RcOverride{
597 int qscale; // If this is 0 then quality_factor will be used instead.
598 float quality_factor;
601 #define FF_MAX_B_FRAMES 16
604 These flags can be passed in AVCodecContext.flags before initialization.
605 Note: Not everything is supported yet.
608 #define CODEC_FLAG_QSCALE 0x0002 ///< Use fixed qscale.
609 #define CODEC_FLAG_4MV 0x0004 ///< 4 MV per MB allowed / advanced prediction for H.263.
610 #define CODEC_FLAG_QPEL 0x0010 ///< Use qpel MC.
611 #define CODEC_FLAG_GMC 0x0020 ///< Use GMC.
612 #define CODEC_FLAG_MV0 0x0040 ///< Always try a MB with MV=<0,0>.
613 #define CODEC_FLAG_PART 0x0080 ///< Use data partitioning.
615 * The parent program guarantees that the input for B-frames containing
616 * streams is not written to for at least s->max_b_frames+1 frames, if
617 * this is not set the input will be copied.
619 #define CODEC_FLAG_INPUT_PRESERVED 0x0100
620 #define CODEC_FLAG_PASS1 0x0200 ///< Use internal 2pass ratecontrol in first pass mode.
621 #define CODEC_FLAG_PASS2 0x0400 ///< Use internal 2pass ratecontrol in second pass mode.
622 #define CODEC_FLAG_EXTERN_HUFF 0x1000 ///< Use external Huffman table (for MJPEG).
623 #define CODEC_FLAG_GRAY 0x2000 ///< Only decode/encode grayscale.
624 #define CODEC_FLAG_EMU_EDGE 0x4000 ///< Don't draw edges.
625 #define CODEC_FLAG_PSNR 0x8000 ///< error[?] variables will be set during encoding.
626 #define CODEC_FLAG_TRUNCATED 0x00010000 /** Input bitstream might be truncated at a random
627 location instead of only at frame boundaries. */
628 #define CODEC_FLAG_NORMALIZE_AQP 0x00020000 ///< Normalize adaptive quantization.
629 #define CODEC_FLAG_INTERLACED_DCT 0x00040000 ///< Use interlaced DCT.
630 #define CODEC_FLAG_LOW_DELAY 0x00080000 ///< Force low delay.
631 #define CODEC_FLAG_ALT_SCAN 0x00100000 ///< Use alternate scan.
632 #define CODEC_FLAG_GLOBAL_HEADER 0x00400000 ///< Place global headers in extradata instead of every keyframe.
633 #define CODEC_FLAG_BITEXACT 0x00800000 ///< Use only bitexact stuff (except (I)DCT).
634 /* Fx : Flag for h263+ extra options */
635 #define CODEC_FLAG_AC_PRED 0x01000000 ///< H.263 advanced intra coding / MPEG-4 AC prediction
636 #define CODEC_FLAG_H263P_UMV 0x02000000 ///< unlimited motion vector
637 #define CODEC_FLAG_CBP_RD 0x04000000 ///< Use rate distortion optimization for cbp.
638 #define CODEC_FLAG_QP_RD 0x08000000 ///< Use rate distortion optimization for qp selectioon.
639 #define CODEC_FLAG_H263P_AIV 0x00000008 ///< H.263 alternative inter VLC
640 #define CODEC_FLAG_OBMC 0x00000001 ///< OBMC
641 #define CODEC_FLAG_LOOP_FILTER 0x00000800 ///< loop filter
642 #define CODEC_FLAG_H263P_SLICE_STRUCT 0x10000000
643 #define CODEC_FLAG_INTERLACED_ME 0x20000000 ///< interlaced motion estimation
644 #define CODEC_FLAG_SVCD_SCAN_OFFSET 0x40000000 ///< Will reserve space for SVCD scan offset user data.
645 #define CODEC_FLAG_CLOSED_GOP 0x80000000
646 #define CODEC_FLAG2_FAST 0x00000001 ///< Allow non spec compliant speedup tricks.
647 #define CODEC_FLAG2_STRICT_GOP 0x00000002 ///< Strictly enforce GOP size.
648 #define CODEC_FLAG2_NO_OUTPUT 0x00000004 ///< Skip bitstream encoding.
649 #define CODEC_FLAG2_LOCAL_HEADER 0x00000008 ///< Place global headers at every keyframe instead of in extradata.
650 #define CODEC_FLAG2_BPYRAMID 0x00000010 ///< H.264 allow B-frames to be used as references.
651 #define CODEC_FLAG2_WPRED 0x00000020 ///< H.264 weighted biprediction for B-frames
652 #define CODEC_FLAG2_MIXED_REFS 0x00000040 ///< H.264 one reference per partition, as opposed to one reference per macroblock
653 #define CODEC_FLAG2_8X8DCT 0x00000080 ///< H.264 high profile 8x8 transform
654 #define CODEC_FLAG2_FASTPSKIP 0x00000100 ///< H.264 fast pskip
655 #define CODEC_FLAG2_AUD 0x00000200 ///< H.264 access unit delimiters
656 #define CODEC_FLAG2_BRDO 0x00000400 ///< B-frame rate-distortion optimization
657 #define CODEC_FLAG2_INTRA_VLC 0x00000800 ///< Use MPEG-2 intra VLC table.
658 #define CODEC_FLAG2_MEMC_ONLY 0x00001000 ///< Only do ME/MC (I frames -> ref, P frame -> ME+MC).
659 #define CODEC_FLAG2_DROP_FRAME_TIMECODE 0x00002000 ///< timecode is in drop frame format.
660 #define CODEC_FLAG2_SKIP_RD 0x00004000 ///< RD optimal MB level residual skipping
661 #define CODEC_FLAG2_CHUNKS 0x00008000 ///< Input bitstream might be truncated at a packet boundaries instead of only at frame boundaries.
662 #define CODEC_FLAG2_NON_LINEAR_QUANT 0x00010000 ///< Use MPEG-2 nonlinear quantizer.
663 #define CODEC_FLAG2_BIT_RESERVOIR 0x00020000 ///< Use a bit reservoir when encoding if possible
664 #define CODEC_FLAG2_MBTREE 0x00040000 ///< Use macroblock tree ratecontrol (x264 only)
665 #define CODEC_FLAG2_PSY 0x00080000 ///< Use psycho visual optimizations.
666 #define CODEC_FLAG2_SSIM 0x00100000 ///< Compute SSIM during encoding, error[] values are undefined.
667 #define CODEC_FLAG2_INTRA_REFRESH 0x00200000 ///< Use periodic insertion of intra blocks instead of keyframes.
669 /* Unsupported options :
670 * Syntax Arithmetic coding (SAC)
671 * Reference Picture Selection
672 * Independent Segment Decoding */
674 /* codec capabilities */
676 #define CODEC_CAP_DRAW_HORIZ_BAND 0x0001 ///< Decoder can use draw_horiz_band callback.
678 * Codec uses get_buffer() for allocating buffers and supports custom allocators.
679 * If not set, it might not use get_buffer() at all or use operations that
680 * assume the buffer was allocated by avcodec_default_get_buffer.
682 #define CODEC_CAP_DR1 0x0002
683 /* If 'parse_only' field is true, then avcodec_parse_frame() can be used. */
684 #define CODEC_CAP_PARSE_ONLY 0x0004
685 #define CODEC_CAP_TRUNCATED 0x0008
686 /* Codec can export data for HW decoding (XvMC). */
687 #define CODEC_CAP_HWACCEL 0x0010
689 * Codec has a nonzero delay and needs to be fed with NULL at the end to get the delayed data.
690 * If this is not set, the codec is guaranteed to never be fed with NULL data.
692 #define CODEC_CAP_DELAY 0x0020
694 * Codec can be fed a final frame with a smaller size.
695 * This can be used to prevent truncation of the last audio samples.
697 #define CODEC_CAP_SMALL_LAST_FRAME 0x0040
699 * Codec can export data for HW decoding (VDPAU).
701 #define CODEC_CAP_HWACCEL_VDPAU 0x0080
703 * Codec can output multiple frames per AVPacket
704 * Normally demuxers return one frame at a time, demuxers which do not do
705 * are connected to a parser to split what they return into proper frames.
706 * This flag is reserved to the very rare category of codecs which have a
707 * bitstream that cannot be split into frames without timeconsuming
708 * operations like full decoding. Demuxers carring such bitstreams thus
709 * may return multiple frames in a packet. This has many disadvantages like
710 * prohibiting stream copy in many cases thus it should only be considered
713 #define CODEC_CAP_SUBFRAMES 0x0100
715 * Codec is experimental and is thus avoided in favor of non experimental
718 #define CODEC_CAP_EXPERIMENTAL 0x0200
720 * Codec should fill in channel configuration and samplerate instead of container
722 #define CODEC_CAP_CHANNEL_CONF 0x0400
724 * Codec is able to deal with negative linesizes
726 #define CODEC_CAP_NEG_LINESIZES 0x0800
728 //The following defines may change, don't expect compatibility if you use them.
729 #define MB_TYPE_INTRA4x4 0x0001
730 #define MB_TYPE_INTRA16x16 0x0002 //FIXME H.264-specific
731 #define MB_TYPE_INTRA_PCM 0x0004 //FIXME H.264-specific
732 #define MB_TYPE_16x16 0x0008
733 #define MB_TYPE_16x8 0x0010
734 #define MB_TYPE_8x16 0x0020
735 #define MB_TYPE_8x8 0x0040
736 #define MB_TYPE_INTERLACED 0x0080
737 #define MB_TYPE_DIRECT2 0x0100 //FIXME
738 #define MB_TYPE_ACPRED 0x0200
739 #define MB_TYPE_GMC 0x0400
740 #define MB_TYPE_SKIP 0x0800
741 #define MB_TYPE_P0L0 0x1000
742 #define MB_TYPE_P1L0 0x2000
743 #define MB_TYPE_P0L1 0x4000
744 #define MB_TYPE_P1L1 0x8000
745 #define MB_TYPE_L0 (MB_TYPE_P0L0 | MB_TYPE_P1L0)
746 #define MB_TYPE_L1 (MB_TYPE_P0L1 | MB_TYPE_P1L1)
747 #define MB_TYPE_L0L1 (MB_TYPE_L0 | MB_TYPE_L1)
748 #define MB_TYPE_QUANT 0x00010000
749 #define MB_TYPE_CBP 0x00020000
750 //Note bits 24-31 are reserved for codec specific use (h264 ref0, mpeg1 0mv, ...)
754 * This specifies the area which should be displayed.
755 * Note there may be multiple such areas for one frame.
757 typedef struct AVPanScan{
760 * - encoding: Set by user.
761 * - decoding: Set by libavcodec.
766 * width and height in 1/16 pel
767 * - encoding: Set by user.
768 * - decoding: Set by libavcodec.
774 * position of the top left corner in 1/16 pel for up to 3 fields/frames
775 * - encoding: Set by user.
776 * - decoding: Set by libavcodec.
778 int16_t position[3][2];
781 #define FF_COMMON_FRAME \
783 * pointer to the picture planes.\
784 * This might be different from the first allocated byte\
791 * pointer to the first allocated byte of the picture. Can be used in get_buffer/release_buffer.\
792 * This isn't used by libavcodec unless the default get/release_buffer() is used.\
798 * 1 -> keyframe, 0-> not\
799 * - encoding: Set by libavcodec.\
800 * - decoding: Set by libavcodec.\
805 * Picture type of the frame, see ?_TYPE below.\
806 * - encoding: Set by libavcodec. for coded_picture (and set by user for input).\
807 * - decoding: Set by libavcodec.\
812 * presentation timestamp in time_base units (time when frame should be shown to user)\
813 * If AV_NOPTS_VALUE then frame_rate = 1/time_base will be assumed.\
814 * - encoding: MUST be set by user.\
815 * - decoding: Set by libavcodec.\
820 * picture number in bitstream order\
821 * - encoding: set by\
822 * - decoding: Set by libavcodec.\
824 int coded_picture_number;\
826 * picture number in display order\
827 * - encoding: set by\
828 * - decoding: Set by libavcodec.\
830 int display_picture_number;\
833 * quality (between 1 (good) and FF_LAMBDA_MAX (bad)) \
834 * - encoding: Set by libavcodec. for coded_picture (and set by user for input).\
835 * - decoding: Set by libavcodec.\
840 * buffer age (1->was last buffer and dint change, 2->..., ...).\
841 * Set to INT_MAX if the buffer has not been used yet.\
842 * - encoding: unused\
843 * - decoding: MUST be set by get_buffer().\
848 * is this picture used as reference\
849 * The values for this are the same as the MpegEncContext.picture_structure\
850 * variable, that is 1->top field, 2->bottom field, 3->frame/both fields.\
851 * Set to 4 for delayed, non-reference frames.\
852 * - encoding: unused\
853 * - decoding: Set by libavcodec. (before get_buffer() call)).\
859 * - encoding: unused\
860 * - decoding: Set by libavcodec.\
862 int8_t *qscale_table;\
865 * - encoding: unused\
866 * - decoding: Set by libavcodec.\
871 * mbskip_table[mb]>=1 if MB didn't change\
872 * stride= mb_width = (width+15)>>4\
873 * - encoding: unused\
874 * - decoding: Set by libavcodec.\
876 uint8_t *mbskip_table;\
879 * motion vector table\
882 * int mv_sample_log2= 4 - motion_subsample_log2;\
883 * int mb_width= (width+15)>>4;\
884 * int mv_stride= (mb_width << mv_sample_log2) + 1;\
885 * motion_val[direction][x + y*mv_stride][0->mv_x, 1->mv_y];\
887 * - encoding: Set by user.\
888 * - decoding: Set by libavcodec.\
890 int16_t (*motion_val[2])[2];\
893 * macroblock type table\
894 * mb_type_base + mb_width + 2\
895 * - encoding: Set by user.\
896 * - decoding: Set by libavcodec.\
901 * log2 of the size of the block which a single vector in motion_val represents: \
902 * (4->16x16, 3->8x8, 2-> 4x4, 1-> 2x2)\
903 * - encoding: unused\
904 * - decoding: Set by libavcodec.\
906 uint8_t motion_subsample_log2;\
909 * for some private data of the user\
910 * - encoding: unused\
911 * - decoding: Set by user.\
917 * - encoding: Set by libavcodec. if flags&CODEC_FLAG_PSNR.\
918 * - decoding: unused\
923 * type of the buffer (to keep track of who has to deallocate data[*])\
924 * - encoding: Set by the one who allocates it.\
925 * - decoding: Set by the one who allocates it.\
926 * Note: User allocated (direct rendering) & internal buffers cannot coexist currently.\
931 * When decoding, this signals how much the picture must be delayed.\
932 * extra_delay = repeat_pict / (2*fps)\
933 * - encoding: unused\
934 * - decoding: Set by libavcodec.\
944 * The content of the picture is interlaced.\
945 * - encoding: Set by user.\
946 * - decoding: Set by libavcodec. (default 0)\
948 int interlaced_frame;\
951 * If the content is interlaced, is top field displayed first.\
952 * - encoding: Set by user.\
953 * - decoding: Set by libavcodec.\
955 int top_field_first;\
959 * - encoding: Set by user.\
960 * - decoding: Set by libavcodec.\
962 AVPanScan *pan_scan;\
965 * Tell user application that palette has changed from previous frame.\
966 * - encoding: ??? (no palette-enabled encoder yet)\
967 * - decoding: Set by libavcodec. (default 0).\
969 int palette_has_changed;\
972 * codec suggestion on buffer type if != 0\
973 * - encoding: unused\
974 * - decoding: Set by libavcodec. (before get_buffer() call)).\
980 * - encoding: unused\
981 * - decoding: Set by libavcodec.\
986 * motion reference frame index\
987 * the order in which these are stored can depend on the codec.\
988 * - encoding: Set by user.\
989 * - decoding: Set by libavcodec.\
991 int8_t *ref_index[2];\
994 * reordered opaque 64bit (generally a integer or double preccission float \
995 * PTS but can be anything). \
996 * The user sets AVCodecContext.reordered_opaque to represent the input at\
998 * the decoder reorderes values as needed and sets AVFrame.reordered_opaque\
999 * to exactly one of the values provided by the user through AVCodecContext.reordered_opaque \
1000 * - encoding: unused\
1001 * - decoding: Read by user.\
1003 int64_t reordered_opaque;\
1006 * hardware accelerator private data (FFmpeg allocated)\
1007 * - encoding: unused\
1008 * - decoding: Set by libavcodec\
1010 void *hwaccel_picture_private;\
1013 #define FF_QSCALE_TYPE_MPEG1 0
1014 #define FF_QSCALE_TYPE_MPEG2 1
1015 #define FF_QSCALE_TYPE_H264 2
1016 #define FF_QSCALE_TYPE_VP56 3
1018 #define FF_BUFFER_TYPE_INTERNAL 1
1019 #define FF_BUFFER_TYPE_USER 2 ///< direct rendering buffers (image is (de)allocated by user)
1020 #define FF_BUFFER_TYPE_SHARED 4 ///< Buffer from somewhere else; don't deallocate image (data/base), all other tables are not shared.
1021 #define FF_BUFFER_TYPE_COPY 8 ///< Just a (modified) copy of some other buffer, don't deallocate anything.
1024 #define FF_I_TYPE 1 ///< Intra
1025 #define FF_P_TYPE 2 ///< Predicted
1026 #define FF_B_TYPE 3 ///< Bi-dir predicted
1027 #define FF_S_TYPE 4 ///< S(GMC)-VOP MPEG4
1028 #define FF_SI_TYPE 5 ///< Switching Intra
1029 #define FF_SP_TYPE 6 ///< Switching Predicted
1030 #define FF_BI_TYPE 7
1032 #define FF_BUFFER_HINTS_VALID 0x01 // Buffer hints value is meaningful (if 0 ignore).
1033 #define FF_BUFFER_HINTS_READABLE 0x02 // Codec will read from buffer.
1034 #define FF_BUFFER_HINTS_PRESERVE 0x04 // User must not alter buffer content.
1035 #define FF_BUFFER_HINTS_REUSABLE 0x08 // Codec will reuse the buffer (update).
1037 typedef struct AVPacket {
1039 * Presentation timestamp in AVStream->time_base units; the time at which
1040 * the decompressed packet will be presented to the user.
1041 * Can be AV_NOPTS_VALUE if it is not stored in the file.
1042 * pts MUST be larger or equal to dts as presentation cannot happen before
1043 * decompression, unless one wants to view hex dumps. Some formats misuse
1044 * the terms dts and pts/cts to mean something different. Such timestamps
1045 * must be converted to true pts/dts before they are stored in AVPacket.
1049 * Decompression timestamp in AVStream->time_base units; the time at which
1050 * the packet is decompressed.
1051 * Can be AV_NOPTS_VALUE if it is not stored in the file.
1059 * Duration of this packet in AVStream->time_base units, 0 if unknown.
1060 * Equals next_pts - this_pts in presentation order.
1063 void (*destruct)(struct AVPacket *);
1065 int64_t pos; ///< byte position in stream, -1 if unknown
1068 * Time difference in AVStream->time_base units from the pts of this
1069 * packet to the point at which the output from the decoder has converged
1070 * independent from the availability of previous frames. That is, the
1071 * frames are virtually identical no matter if decoding started from
1072 * the very first frame or from this keyframe.
1073 * Is AV_NOPTS_VALUE if unknown.
1074 * This field is not the display duration of the current packet.
1075 * This field has no meaning if the packet does not have AV_PKT_FLAG_KEY
1078 * The purpose of this field is to allow seeking in streams that have no
1079 * keyframes in the conventional sense. It corresponds to the
1080 * recovery point SEI in H.264 and match_time_delta in NUT. It is also
1081 * essential for some types of subtitle streams to ensure that all
1082 * subtitles are correctly displayed after seeking.
1084 int64_t convergence_duration;
1086 #define AV_PKT_FLAG_KEY 0x0001
1087 #if LIBAVCODEC_VERSION_MAJOR < 53
1088 #define PKT_FLAG_KEY AV_PKT_FLAG_KEY
1092 * Audio Video Frame.
1093 * New fields can be added to the end of FF_COMMON_FRAME with minor version
1095 * Removal, reordering and changes to existing fields require a major
1096 * version bump. No fields should be added into AVFrame before or after
1098 * sizeof(AVFrame) must not be used outside libav*.
1100 typedef struct AVFrame {
1105 * main external API structure.
1106 * New fields can be added to the end with minor version bumps.
1107 * Removal, reordering and changes to existing fields require a major
1109 * sizeof(AVCodecContext) must not be used outside libav*.
1111 typedef struct AVCodecContext {
1113 * information on struct for av_log
1114 * - set by avcodec_alloc_context
1116 const AVClass *av_class;
1118 * the average bitrate
1119 * - encoding: Set by user; unused for constant quantizer encoding.
1120 * - decoding: Set by libavcodec. 0 or some bitrate if this info is available in the stream.
1125 * number of bits the bitstream is allowed to diverge from the reference.
1126 * the reference can be CBR (for CBR pass1) or VBR (for pass2)
1127 * - encoding: Set by user; unused for constant quantizer encoding.
1128 * - decoding: unused
1130 int bit_rate_tolerance;
1134 * - encoding: Set by user.
1135 * - decoding: Set by user.
1140 * Some codecs need additional format info. It is stored here.
1141 * If any muxer uses this then ALL demuxers/parsers AND encoders for the
1142 * specific codec MUST set it correctly otherwise stream copy breaks.
1143 * In general use of this field by muxers is not recommanded.
1144 * - encoding: Set by libavcodec.
1145 * - decoding: Set by libavcodec. (FIXME: Is this OK?)
1150 * Motion estimation algorithm used for video coding.
1151 * 1 (zero), 2 (full), 3 (log), 4 (phods), 5 (epzs), 6 (x1), 7 (hex),
1152 * 8 (umh), 9 (iter), 10 (tesa) [7, 8, 10 are x264 specific, 9 is snow specific]
1153 * - encoding: MUST be set by user.
1154 * - decoding: unused
1159 * some codecs need / can use extradata like Huffman tables.
1160 * mjpeg: Huffman tables
1161 * rv10: additional flags
1162 * mpeg4: global headers (they can be in the bitstream or here)
1163 * The allocated memory should be FF_INPUT_BUFFER_PADDING_SIZE bytes larger
1164 * than extradata_size to avoid prolems if it is read with the bitstream reader.
1165 * The bytewise contents of extradata must not depend on the architecture or CPU endianness.
1166 * - encoding: Set/allocated/freed by libavcodec.
1167 * - decoding: Set/allocated/freed by user.
1173 * This is the fundamental unit of time (in seconds) in terms
1174 * of which frame timestamps are represented. For fixed-fps content,
1175 * timebase should be 1/framerate and timestamp increments should be
1177 * - encoding: MUST be set by user.
1178 * - decoding: Set by libavcodec.
1180 AVRational time_base;
1184 * picture width / height.
1185 * - encoding: MUST be set by user.
1186 * - decoding: Set by libavcodec.
1187 * Note: For compatibility it is possible to set this instead of
1188 * coded_width/height before decoding.
1192 #define FF_ASPECT_EXTENDED 15
1195 * the number of pictures in a group of pictures, or 0 for intra_only
1196 * - encoding: Set by user.
1197 * - decoding: unused
1202 * Pixel format, see PIX_FMT_xxx.
1203 * May be set by the demuxer if known from headers.
1204 * May be overriden by the decoder if it knows better.
1205 * - encoding: Set by user.
1206 * - decoding: Set by user if known, overridden by libavcodec if known
1208 enum PixelFormat pix_fmt;
1211 * Frame rate emulation. If not zero, the lower layer (i.e. format handler)
1212 * has to read frames at native frame rate.
1213 * - encoding: Set by user.
1214 * - decoding: unused
1219 * If non NULL, 'draw_horiz_band' is called by the libavcodec
1220 * decoder to draw a horizontal band. It improves cache usage. Not
1221 * all codecs can do that. You must check the codec capabilities
1223 * The function is also used by hardware acceleration APIs.
1224 * It is called at least once during frame decoding to pass
1225 * the data needed for hardware render.
1226 * In that mode instead of pixel data, AVFrame points to
1227 * a structure specific to the acceleration API. The application
1228 * reads the structure and can change some fields to indicate progress
1230 * - encoding: unused
1231 * - decoding: Set by user.
1232 * @param height the height of the slice
1233 * @param y the y position of the slice
1234 * @param type 1->top field, 2->bottom field, 3->frame
1235 * @param offset offset into the AVFrame.data from which the slice should be read
1237 void (*draw_horiz_band)(struct AVCodecContext *s,
1238 const AVFrame *src, int offset[4],
1239 int y, int type, int height);
1242 int sample_rate; ///< samples per second
1243 int channels; ///< number of audio channels
1246 * audio sample format
1247 * - encoding: Set by user.
1248 * - decoding: Set by libavcodec.
1250 enum AVSampleFormat sample_fmt; ///< sample format
1252 /* The following data should not be initialized. */
1254 * Samples per packet, initialized when calling 'init'.
1257 int frame_number; ///< audio or video frame number
1258 #if LIBAVCODEC_VERSION_MAJOR < 53
1259 int real_pict_num; ///< Returns the real picture number of previous encoded frame.
1263 * Number of frames the decoded output will be delayed relative to
1264 * the encoded input.
1265 * - encoding: Set by libavcodec.
1266 * - decoding: unused
1270 /* - encoding parameters */
1271 float qcompress; ///< amount of qscale change between easy & hard scenes (0.0-1.0)
1272 float qblur; ///< amount of qscale smoothing over time (0.0-1.0)
1276 * - encoding: Set by user.
1277 * - decoding: unused
1283 * - encoding: Set by user.
1284 * - decoding: unused
1289 * maximum quantizer difference between frames
1290 * - encoding: Set by user.
1291 * - decoding: unused
1296 * maximum number of B-frames between non-B-frames
1297 * Note: The output will be delayed by max_b_frames+1 relative to the input.
1298 * - encoding: Set by user.
1299 * - decoding: unused
1304 * qscale factor between IP and B-frames
1305 * If > 0 then the last P-frame quantizer will be used (q= lastp_q*factor+offset).
1306 * If < 0 then normal ratecontrol will be done (q= -normal_q*factor+offset).
1307 * - encoding: Set by user.
1308 * - decoding: unused
1310 float b_quant_factor;
1312 /** obsolete FIXME remove */
1314 #define FF_RC_STRATEGY_XVID 1
1316 int b_frame_strategy;
1320 * - encoding: unused
1321 * - decoding: Set by user. 1-> Skip B-frames, 2-> Skip IDCT/dequant too, 5-> Skip everything except header
1322 * @deprecated Deprecated in favor of skip_idct and skip_frame.
1326 struct AVCodec *codec;
1330 int rtp_payload_size; /* The size of the RTP payload: the coder will */
1331 /* do its best to deliver a chunk with size */
1332 /* below rtp_payload_size, the chunk will start */
1333 /* with a start code on some codecs like H.263. */
1334 /* This doesn't take account of any particular */
1335 /* headers inside the transmitted RTP payload. */
1338 /* The RTP callback: This function is called */
1339 /* every time the encoder has a packet to send. */
1340 /* It depends on the encoder if the data starts */
1341 /* with a Start Code (it should). H.263 does. */
1342 /* mb_nb contains the number of macroblocks */
1343 /* encoded in the RTP payload. */
1344 void (*rtp_callback)(struct AVCodecContext *avctx, void *data, int size, int mb_nb);
1346 /* statistics, used for 2-pass encoding */
1357 * number of bits used for the previously encoded frame
1358 * - encoding: Set by libavcodec.
1359 * - decoding: unused
1364 * Private data of the user, can be used to carry app specific stuff.
1365 * - encoding: Set by user.
1366 * - decoding: Set by user.
1370 char codec_name[32];
1371 enum AVMediaType codec_type; /* see AVMEDIA_TYPE_xxx */
1372 enum CodecID codec_id; /* see CODEC_ID_xxx */
1375 * fourcc (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A').
1376 * This is used to work around some encoder bugs.
1377 * A demuxer should set this to what is stored in the field used to identify the codec.
1378 * If there are multiple such fields in a container then the demuxer should choose the one
1379 * which maximizes the information about the used codec.
1380 * If the codec tag field in a container is larger then 32 bits then the demuxer should
1381 * remap the longer ID to 32 bits with a table or other structure. Alternatively a new
1382 * extra_codec_tag + size could be added but for this a clear advantage must be demonstrated
1384 * - encoding: Set by user, if not then the default based on codec_id will be used.
1385 * - decoding: Set by user, will be converted to uppercase by libavcodec during init.
1387 unsigned int codec_tag;
1390 * Work around bugs in encoders which sometimes cannot be detected automatically.
1391 * - encoding: Set by user
1392 * - decoding: Set by user
1394 int workaround_bugs;
1395 #define FF_BUG_AUTODETECT 1 ///< autodetection
1396 #define FF_BUG_OLD_MSMPEG4 2
1397 #define FF_BUG_XVID_ILACE 4
1398 #define FF_BUG_UMP4 8
1399 #define FF_BUG_NO_PADDING 16
1400 #define FF_BUG_AMV 32
1401 #define FF_BUG_AC_VLC 0 ///< Will be removed, libavcodec can now handle these non-compliant files by default.
1402 #define FF_BUG_QPEL_CHROMA 64
1403 #define FF_BUG_STD_QPEL 128
1404 #define FF_BUG_QPEL_CHROMA2 256
1405 #define FF_BUG_DIRECT_BLOCKSIZE 512
1406 #define FF_BUG_EDGE 1024
1407 #define FF_BUG_HPEL_CHROMA 2048
1408 #define FF_BUG_DC_CLIP 4096
1409 #define FF_BUG_MS 8192 ///< Work around various bugs in Microsoft's broken decoders.
1410 #define FF_BUG_TRUNCATED 16384
1411 //#define FF_BUG_FAKE_SCALABILITY 16 //Autodetection should work 100%.
1414 * luma single coefficient elimination threshold
1415 * - encoding: Set by user.
1416 * - decoding: unused
1418 int luma_elim_threshold;
1421 * chroma single coeff elimination threshold
1422 * - encoding: Set by user.
1423 * - decoding: unused
1425 int chroma_elim_threshold;
1428 * strictly follow the standard (MPEG4, ...).
1429 * - encoding: Set by user.
1430 * - decoding: Set by user.
1431 * Setting this to STRICT or higher means the encoder and decoder will
1432 * generally do stupid things, whereas setting it to unofficial or lower
1433 * will mean the encoder might produce output that is not supported by all
1434 * spec-compliant decoders. Decoders don't differentiate between normal,
1435 * unofficial and experimental (that is, they always try to decode things
1436 * when they can) unless they are explicitly asked to behave stupidly
1437 * (=strictly conform to the specs)
1439 int strict_std_compliance;
1440 #define FF_COMPLIANCE_VERY_STRICT 2 ///< Strictly conform to an older more strict version of the spec or reference software.
1441 #define FF_COMPLIANCE_STRICT 1 ///< Strictly conform to all the things in the spec no matter what consequences.
1442 #define FF_COMPLIANCE_NORMAL 0
1443 #if FF_API_INOFFICIAL
1444 #define FF_COMPLIANCE_INOFFICIAL -1 ///< Allow inofficial extensions (deprecated - use FF_COMPLIANCE_UNOFFICIAL instead).
1446 #define FF_COMPLIANCE_UNOFFICIAL -1 ///< Allow unofficial extensions
1447 #define FF_COMPLIANCE_EXPERIMENTAL -2 ///< Allow nonstandardized experimental things.
1450 * qscale offset between IP and B-frames
1451 * - encoding: Set by user.
1452 * - decoding: unused
1454 float b_quant_offset;
1457 * Error recognization; higher values will detect more errors but may
1458 * misdetect some more or less valid parts as errors.
1459 * - encoding: unused
1460 * - decoding: Set by user.
1462 int error_recognition;
1463 #define FF_ER_CAREFUL 1
1464 #define FF_ER_COMPLIANT 2
1465 #define FF_ER_AGGRESSIVE 3
1466 #define FF_ER_VERY_AGGRESSIVE 4
1469 * Called at the beginning of each frame to get a buffer for it.
1470 * If pic.reference is set then the frame will be read later by libavcodec.
1471 * avcodec_align_dimensions2() should be used to find the required width and
1472 * height, as they normally need to be rounded up to the next multiple of 16.
1473 * if CODEC_CAP_DR1 is not set then get_buffer() must call
1474 * avcodec_default_get_buffer() instead of providing buffers allocated by
1476 * - encoding: unused
1477 * - decoding: Set by libavcodec, user can override.
1479 int (*get_buffer)(struct AVCodecContext *c, AVFrame *pic);
1482 * Called to release buffers which were allocated with get_buffer.
1483 * A released buffer can be reused in get_buffer().
1484 * pic.data[*] must be set to NULL.
1485 * - encoding: unused
1486 * - decoding: Set by libavcodec, user can override.
1488 void (*release_buffer)(struct AVCodecContext *c, AVFrame *pic);
1491 * Size of the frame reordering buffer in the decoder.
1492 * For MPEG-2 it is 1 IPB or 0 low delay IP.
1493 * - encoding: Set by libavcodec.
1494 * - decoding: Set by libavcodec.
1499 * number of bytes per packet if constant and known or 0
1500 * Used by some WAV based audio codecs.
1504 int parse_only; /* - decoding only: If true, only parsing is done
1505 (function avcodec_parse_frame()). The frame
1506 data is returned. Only MPEG codecs support this now. */
1509 * 0-> h263 quant 1-> mpeg quant
1510 * - encoding: Set by user.
1511 * - decoding: unused
1516 * pass1 encoding statistics output buffer
1517 * - encoding: Set by libavcodec.
1518 * - decoding: unused
1523 * pass2 encoding statistics input buffer
1524 * Concatenated stuff from stats_out of pass1 should be placed here.
1525 * - encoding: Allocated/set/freed by user.
1526 * - decoding: unused
1531 * ratecontrol qmin qmax limiting method
1532 * 0-> clipping, 1-> use a nice continous function to limit qscale wthin qmin/qmax.
1533 * - encoding: Set by user.
1534 * - decoding: unused
1542 * ratecontrol override, see RcOverride
1543 * - encoding: Allocated/set/freed by user.
1544 * - decoding: unused
1546 RcOverride *rc_override;
1547 int rc_override_count;
1550 * rate control equation
1551 * - encoding: Set by user
1552 * - decoding: unused
1558 * - encoding: Set by user.
1559 * - decoding: unused
1565 * - encoding: Set by user.
1566 * - decoding: unused
1571 * decoder bitstream buffer size
1572 * - encoding: Set by user.
1573 * - decoding: unused
1576 float rc_buffer_aggressivity;
1579 * qscale factor between P and I-frames
1580 * If > 0 then the last p frame quantizer will be used (q= lastp_q*factor+offset).
1581 * If < 0 then normal ratecontrol will be done (q= -normal_q*factor+offset).
1582 * - encoding: Set by user.
1583 * - decoding: unused
1585 float i_quant_factor;
1588 * qscale offset between P and I-frames
1589 * - encoding: Set by user.
1590 * - decoding: unused
1592 float i_quant_offset;
1595 * initial complexity for pass1 ratecontrol
1596 * - encoding: Set by user.
1597 * - decoding: unused
1599 float rc_initial_cplx;
1602 * DCT algorithm, see FF_DCT_* below
1603 * - encoding: Set by user.
1604 * - decoding: unused
1607 #define FF_DCT_AUTO 0
1608 #define FF_DCT_FASTINT 1
1609 #define FF_DCT_INT 2
1610 #define FF_DCT_MMX 3
1611 #define FF_DCT_MLIB 4
1612 #define FF_DCT_ALTIVEC 5
1613 #define FF_DCT_FAAN 6
1616 * luminance masking (0-> disabled)
1617 * - encoding: Set by user.
1618 * - decoding: unused
1623 * temporary complexity masking (0-> disabled)
1624 * - encoding: Set by user.
1625 * - decoding: unused
1627 float temporal_cplx_masking;
1630 * spatial complexity masking (0-> disabled)
1631 * - encoding: Set by user.
1632 * - decoding: unused
1634 float spatial_cplx_masking;
1637 * p block masking (0-> disabled)
1638 * - encoding: Set by user.
1639 * - decoding: unused
1644 * darkness masking (0-> disabled)
1645 * - encoding: Set by user.
1646 * - decoding: unused
1651 * IDCT algorithm, see FF_IDCT_* below.
1652 * - encoding: Set by user.
1653 * - decoding: Set by user.
1656 #define FF_IDCT_AUTO 0
1657 #define FF_IDCT_INT 1
1658 #define FF_IDCT_SIMPLE 2
1659 #define FF_IDCT_SIMPLEMMX 3
1660 #define FF_IDCT_LIBMPEG2MMX 4
1661 #define FF_IDCT_PS2 5
1662 #define FF_IDCT_MLIB 6
1663 #define FF_IDCT_ARM 7
1664 #define FF_IDCT_ALTIVEC 8
1665 #define FF_IDCT_SH4 9
1666 #define FF_IDCT_SIMPLEARM 10
1667 #define FF_IDCT_H264 11
1668 #define FF_IDCT_VP3 12
1669 #define FF_IDCT_IPP 13
1670 #define FF_IDCT_XVIDMMX 14
1671 #define FF_IDCT_CAVS 15
1672 #define FF_IDCT_SIMPLEARMV5TE 16
1673 #define FF_IDCT_SIMPLEARMV6 17
1674 #define FF_IDCT_SIMPLEVIS 18
1675 #define FF_IDCT_WMV2 19
1676 #define FF_IDCT_FAAN 20
1677 #define FF_IDCT_EA 21
1678 #define FF_IDCT_SIMPLENEON 22
1679 #define FF_IDCT_SIMPLEALPHA 23
1680 #define FF_IDCT_BINK 24
1684 * - encoding: Set by libavcodec.
1685 * - decoding: Set by user (or 0).
1689 * slice offsets in the frame in bytes
1690 * - encoding: Set/allocated by libavcodec.
1691 * - decoding: Set/allocated by user (or NULL).
1696 * error concealment flags
1697 * - encoding: unused
1698 * - decoding: Set by user.
1700 int error_concealment;
1701 #define FF_EC_GUESS_MVS 1
1702 #define FF_EC_DEBLOCK 2
1705 * dsp_mask could be add used to disable unwanted CPU features
1706 * CPU features (i.e. MMX, SSE. ...)
1708 * With the FORCE flag you may instead enable given CPU features.
1709 * (Dangerous: Usable in case of misdetection, improper usage however will
1710 * result into program crash.)
1715 #define FF_MM_FORCE AV_CPU_FLAG_FORCE
1716 #define FF_MM_MMX AV_CPU_FLAG_MMX
1717 #define FF_MM_3DNOW AV_CPU_FLAG_3DNOW
1718 #define FF_MM_MMXEXT AV_CPU_FLAG_MMX2
1719 #define FF_MM_MMX2 AV_CPU_FLAG_MMX2
1720 #define FF_MM_SSE AV_CPU_FLAG_SSE
1721 #define FF_MM_SSE2 AV_CPU_FLAG_SSE2
1722 #define FF_MM_SSE2SLOW AV_CPU_FLAG_SSE2SLOW
1723 #define FF_MM_3DNOWEXT AV_CPU_FLAG_3DNOWEXT
1724 #define FF_MM_SSE3 AV_CPU_FLAG_SSE3
1725 #define FF_MM_SSE3SLOW AV_CPU_FLAG_SSE3SLOW
1726 #define FF_MM_SSSE3 AV_CPU_FLAG_SSSE3
1727 #define FF_MM_SSE4 AV_CPU_FLAG_SSE4
1728 #define FF_MM_SSE42 AV_CPU_FLAG_SSE42
1729 #define FF_MM_IWMMXT AV_CPU_FLAG_IWMMXT
1730 #define FF_MM_ALTIVEC AV_CPU_FLAG_ALTIVEC
1734 * bits per sample/pixel from the demuxer (needed for huffyuv).
1735 * - encoding: Set by libavcodec.
1736 * - decoding: Set by user.
1738 int bits_per_coded_sample;
1741 * prediction method (needed for huffyuv)
1742 * - encoding: Set by user.
1743 * - decoding: unused
1745 int prediction_method;
1746 #define FF_PRED_LEFT 0
1747 #define FF_PRED_PLANE 1
1748 #define FF_PRED_MEDIAN 2
1751 * sample aspect ratio (0 if unknown)
1752 * That is the width of a pixel divided by the height of the pixel.
1753 * Numerator and denominator must be relatively prime and smaller than 256 for some video standards.
1754 * - encoding: Set by user.
1755 * - decoding: Set by libavcodec.
1757 AVRational sample_aspect_ratio;
1760 * the picture in the bitstream
1761 * - encoding: Set by libavcodec.
1762 * - decoding: Set by libavcodec.
1764 AVFrame *coded_frame;
1768 * - encoding: Set by user.
1769 * - decoding: Set by user.
1772 #define FF_DEBUG_PICT_INFO 1
1773 #define FF_DEBUG_RC 2
1774 #define FF_DEBUG_BITSTREAM 4
1775 #define FF_DEBUG_MB_TYPE 8
1776 #define FF_DEBUG_QP 16
1777 #define FF_DEBUG_MV 32
1778 #define FF_DEBUG_DCT_COEFF 0x00000040
1779 #define FF_DEBUG_SKIP 0x00000080
1780 #define FF_DEBUG_STARTCODE 0x00000100
1781 #define FF_DEBUG_PTS 0x00000200
1782 #define FF_DEBUG_ER 0x00000400
1783 #define FF_DEBUG_MMCO 0x00000800
1784 #define FF_DEBUG_BUGS 0x00001000
1785 #define FF_DEBUG_VIS_QP 0x00002000
1786 #define FF_DEBUG_VIS_MB_TYPE 0x00004000
1787 #define FF_DEBUG_BUFFERS 0x00008000
1791 * - encoding: Set by user.
1792 * - decoding: Set by user.
1795 #define FF_DEBUG_VIS_MV_P_FOR 0x00000001 //visualize forward predicted MVs of P frames
1796 #define FF_DEBUG_VIS_MV_B_FOR 0x00000002 //visualize forward predicted MVs of B frames
1797 #define FF_DEBUG_VIS_MV_B_BACK 0x00000004 //visualize backward predicted MVs of B frames
1801 * - encoding: Set by libavcodec if flags&CODEC_FLAG_PSNR.
1802 * - decoding: unused
1807 * minimum MB quantizer
1808 * - encoding: unused
1809 * - decoding: unused
1814 * maximum MB quantizer
1815 * - encoding: unused
1816 * - decoding: unused
1821 * motion estimation comparison function
1822 * - encoding: Set by user.
1823 * - decoding: unused
1827 * subpixel motion estimation comparison function
1828 * - encoding: Set by user.
1829 * - decoding: unused
1833 * macroblock comparison function (not supported yet)
1834 * - encoding: Set by user.
1835 * - decoding: unused
1839 * interlaced DCT comparison function
1840 * - encoding: Set by user.
1841 * - decoding: unused
1844 #define FF_CMP_SAD 0
1845 #define FF_CMP_SSE 1
1846 #define FF_CMP_SATD 2
1847 #define FF_CMP_DCT 3
1848 #define FF_CMP_PSNR 4
1849 #define FF_CMP_BIT 5
1851 #define FF_CMP_ZERO 7
1852 #define FF_CMP_VSAD 8
1853 #define FF_CMP_VSSE 9
1854 #define FF_CMP_NSSE 10
1855 #define FF_CMP_W53 11
1856 #define FF_CMP_W97 12
1857 #define FF_CMP_DCTMAX 13
1858 #define FF_CMP_DCT264 14
1859 #define FF_CMP_CHROMA 256
1862 * ME diamond size & shape
1863 * - encoding: Set by user.
1864 * - decoding: unused
1869 * amount of previous MV predictors (2a+1 x 2a+1 square)
1870 * - encoding: Set by user.
1871 * - decoding: unused
1873 int last_predictor_count;
1876 * prepass for motion estimation
1877 * - encoding: Set by user.
1878 * - decoding: unused
1883 * motion estimation prepass comparison function
1884 * - encoding: Set by user.
1885 * - decoding: unused
1890 * ME prepass diamond size & shape
1891 * - encoding: Set by user.
1892 * - decoding: unused
1898 * - encoding: Set by user.
1899 * - decoding: unused
1901 int me_subpel_quality;
1904 * callback to negotiate the pixelFormat
1905 * @param fmt is the list of formats which are supported by the codec,
1906 * it is terminated by -1 as 0 is a valid format, the formats are ordered by quality.
1907 * The first is always the native one.
1908 * @return the chosen format
1909 * - encoding: unused
1910 * - decoding: Set by user, if not set the native format will be chosen.
1912 enum PixelFormat (*get_format)(struct AVCodecContext *s, const enum PixelFormat * fmt);
1915 * DTG active format information (additional aspect ratio
1916 * information only used in DVB MPEG-2 transport streams)
1919 * - encoding: unused
1920 * - decoding: Set by decoder.
1922 int dtg_active_format;
1923 #define FF_DTG_AFD_SAME 8
1924 #define FF_DTG_AFD_4_3 9
1925 #define FF_DTG_AFD_16_9 10
1926 #define FF_DTG_AFD_14_9 11
1927 #define FF_DTG_AFD_4_3_SP_14_9 13
1928 #define FF_DTG_AFD_16_9_SP_14_9 14
1929 #define FF_DTG_AFD_SP_4_3 15
1932 * maximum motion estimation search range in subpel units
1933 * If 0 then no limit.
1935 * - encoding: Set by user.
1936 * - decoding: unused
1941 * intra quantizer bias
1942 * - encoding: Set by user.
1943 * - decoding: unused
1945 int intra_quant_bias;
1946 #define FF_DEFAULT_QUANT_BIAS 999999
1949 * inter quantizer bias
1950 * - encoding: Set by user.
1951 * - decoding: unused
1953 int inter_quant_bias;
1957 * - encoding: unused
1958 * - decoding: Which clrtable should be used for 8bit RGB images.
1959 * Tables have to be stored somewhere. FIXME
1964 * internal_buffer count
1965 * Don't touch, used by libavcodec default_get_buffer().
1967 int internal_buffer_count;
1971 * Don't touch, used by libavcodec default_get_buffer().
1973 void *internal_buffer;
1976 * Global quality for codecs which cannot change it per frame.
1977 * This should be proportional to MPEG-1/2/4 qscale.
1978 * - encoding: Set by user.
1979 * - decoding: unused
1983 #define FF_CODER_TYPE_VLC 0
1984 #define FF_CODER_TYPE_AC 1
1985 #define FF_CODER_TYPE_RAW 2
1986 #define FF_CODER_TYPE_RLE 3
1987 #define FF_CODER_TYPE_DEFLATE 4
1990 * - encoding: Set by user.
1991 * - decoding: unused
1997 * - encoding: Set by user.
1998 * - decoding: unused
2004 * - encoding: unused
2005 * - decoding: Set by user.
2007 uint8_t * (*realloc)(struct AVCodecContext *s, uint8_t *buf, int buf_size);
2012 * - encoding: unused
2013 * - decoding: Set by user.
2016 #define SLICE_FLAG_CODED_ORDER 0x0001 ///< draw_horiz_band() is called in coded order instead of display
2017 #define SLICE_FLAG_ALLOW_FIELD 0x0002 ///< allow draw_horiz_band() with field slices (MPEG2 field pics)
2018 #define SLICE_FLAG_ALLOW_PLANE 0x0004 ///< allow draw_horiz_band() with 1 component at a time (SVQ1)
2021 * XVideo Motion Acceleration
2022 * - encoding: forbidden
2023 * - decoding: set by decoder
2025 int xvmc_acceleration;
2028 * macroblock decision mode
2029 * - encoding: Set by user.
2030 * - decoding: unused
2033 #define FF_MB_DECISION_SIMPLE 0 ///< uses mb_cmp
2034 #define FF_MB_DECISION_BITS 1 ///< chooses the one which needs the fewest bits
2035 #define FF_MB_DECISION_RD 2 ///< rate distortion
2038 * custom intra quantization matrix
2039 * - encoding: Set by user, can be NULL.
2040 * - decoding: Set by libavcodec.
2042 uint16_t *intra_matrix;
2045 * custom inter quantization matrix
2046 * - encoding: Set by user, can be NULL.
2047 * - decoding: Set by libavcodec.
2049 uint16_t *inter_matrix;
2052 * fourcc from the AVI stream header (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A').
2053 * This is used to work around some encoder bugs.
2054 * - encoding: unused
2055 * - decoding: Set by user, will be converted to uppercase by libavcodec during init.
2057 unsigned int stream_codec_tag;
2060 * scene change detection threshold
2061 * 0 is default, larger means fewer detected scene changes.
2062 * - encoding: Set by user.
2063 * - decoding: unused
2065 int scenechange_threshold;
2068 * minimum Lagrange multipler
2069 * - encoding: Set by user.
2070 * - decoding: unused
2075 * maximum Lagrange multipler
2076 * - encoding: Set by user.
2077 * - decoding: unused
2081 #if FF_API_PALETTE_CONTROL
2083 * palette control structure
2084 * - encoding: ??? (no palette-enabled encoder yet)
2085 * - decoding: Set by user.
2087 struct AVPaletteControl *palctrl;
2091 * noise reduction strength
2092 * - encoding: Set by user.
2093 * - decoding: unused
2095 int noise_reduction;
2098 * Called at the beginning of a frame to get cr buffer for it.
2099 * Buffer type (size, hints) must be the same. libavcodec won't check it.
2100 * libavcodec will pass previous buffer in pic, function should return
2101 * same buffer or new buffer with old frame "painted" into it.
2102 * If pic.data[0] == NULL must behave like get_buffer().
2103 * if CODEC_CAP_DR1 is not set then reget_buffer() must call
2104 * avcodec_default_reget_buffer() instead of providing buffers allocated by
2106 * - encoding: unused
2107 * - decoding: Set by libavcodec, user can override.
2109 int (*reget_buffer)(struct AVCodecContext *c, AVFrame *pic);
2112 * Number of bits which should be loaded into the rc buffer before decoding starts.
2113 * - encoding: Set by user.
2114 * - decoding: unused
2116 int rc_initial_buffer_occupancy;
2120 * - encoding: Set by user.
2121 * - decoding: unused
2123 int inter_threshold;
2127 * - encoding: Set by user.
2128 * - decoding: Set by user.
2133 * Simulates errors in the bitstream to test error concealment.
2134 * - encoding: Set by user.
2135 * - decoding: unused
2140 * MP3 antialias algorithm, see FF_AA_* below.
2141 * - encoding: unused
2142 * - decoding: Set by user.
2145 #define FF_AA_AUTO 0
2146 #define FF_AA_FASTINT 1 //not implemented yet
2148 #define FF_AA_FLOAT 3
2150 * quantizer noise shaping
2151 * - encoding: Set by user.
2152 * - decoding: unused
2154 int quantizer_noise_shaping;
2158 * is used to decide how many independent tasks should be passed to execute()
2159 * - encoding: Set by user.
2160 * - decoding: Set by user.
2165 * The codec may call this to execute several independent things.
2166 * It will return only after finishing all tasks.
2167 * The user may replace this with some multithreaded implementation,
2168 * the default implementation will execute the parts serially.
2169 * @param count the number of things to execute
2170 * - encoding: Set by libavcodec, user can override.
2171 * - decoding: Set by libavcodec, user can override.
2173 int (*execute)(struct AVCodecContext *c, int (*func)(struct AVCodecContext *c2, void *arg), void *arg2, int *ret, int count, int size);
2177 * Can be used by execute() to store some per AVCodecContext stuff.
2178 * - encoding: set by execute()
2179 * - decoding: set by execute()
2181 void *thread_opaque;
2184 * Motion estimation threshold below which no motion estimation is
2185 * performed, but instead the user specified motion vectors are used.
2187 * - encoding: Set by user.
2188 * - decoding: unused
2193 * Macroblock threshold below which the user specified macroblock types will be used.
2194 * - encoding: Set by user.
2195 * - decoding: unused
2200 * precision of the intra DC coefficient - 8
2201 * - encoding: Set by user.
2202 * - decoding: unused
2204 int intra_dc_precision;
2207 * noise vs. sse weight for the nsse comparsion function
2208 * - encoding: Set by user.
2209 * - decoding: unused
2214 * Number of macroblock rows at the top which are skipped.
2215 * - encoding: unused
2216 * - decoding: Set by user.
2221 * Number of macroblock rows at the bottom which are skipped.
2222 * - encoding: unused
2223 * - decoding: Set by user.
2229 * - encoding: Set by user.
2230 * - decoding: Set by libavcodec.
2233 #define FF_PROFILE_UNKNOWN -99
2235 #define FF_PROFILE_AAC_MAIN 0
2236 #define FF_PROFILE_AAC_LOW 1
2237 #define FF_PROFILE_AAC_SSR 2
2238 #define FF_PROFILE_AAC_LTP 3
2240 #define FF_PROFILE_H264_BASELINE 66
2241 #define FF_PROFILE_H264_MAIN 77
2242 #define FF_PROFILE_H264_EXTENDED 88
2243 #define FF_PROFILE_H264_HIGH 100
2244 #define FF_PROFILE_H264_HIGH_10 110
2245 #define FF_PROFILE_H264_HIGH_422 122
2246 #define FF_PROFILE_H264_HIGH_444 244
2247 #define FF_PROFILE_H264_CAVLC_444 44
2251 * - encoding: Set by user.
2252 * - decoding: Set by libavcodec.
2255 #define FF_LEVEL_UNKNOWN -99
2258 * low resolution decoding, 1-> 1/2 size, 2->1/4 size
2259 * - encoding: unused
2260 * - decoding: Set by user.
2265 * Bitstream width / height, may be different from width/height if lowres
2266 * or other things are used.
2267 * - encoding: unused
2268 * - decoding: Set by user before init if known. Codec should override / dynamically change if needed.
2270 int coded_width, coded_height;
2273 * frame skip threshold
2274 * - encoding: Set by user.
2275 * - decoding: unused
2277 int frame_skip_threshold;
2281 * - encoding: Set by user.
2282 * - decoding: unused
2284 int frame_skip_factor;
2287 * frame skip exponent
2288 * - encoding: Set by user.
2289 * - decoding: unused
2294 * frame skip comparison function
2295 * - encoding: Set by user.
2296 * - decoding: unused
2301 * Border processing masking, raises the quantizer for mbs on the borders
2303 * - encoding: Set by user.
2304 * - decoding: unused
2306 float border_masking;
2309 * minimum MB lagrange multipler
2310 * - encoding: Set by user.
2311 * - decoding: unused
2316 * maximum MB lagrange multipler
2317 * - encoding: Set by user.
2318 * - decoding: unused
2324 * - encoding: Set by user.
2325 * - decoding: unused
2327 int me_penalty_compensation;
2331 * - encoding: unused
2332 * - decoding: Set by user.
2334 enum AVDiscard skip_loop_filter;
2338 * - encoding: unused
2339 * - decoding: Set by user.
2341 enum AVDiscard skip_idct;
2345 * - encoding: unused
2346 * - decoding: Set by user.
2348 enum AVDiscard skip_frame;
2352 * - encoding: Set by user.
2353 * - decoding: unused
2359 * - encoding: Set by user.
2360 * - decoding: unused
2365 * constant rate factor - quality-based VBR - values ~correspond to qps
2366 * - encoding: Set by user.
2367 * - decoding: unused
2372 * constant quantization parameter rate control method
2373 * - encoding: Set by user.
2374 * - decoding: unused
2380 * - encoding: Set by user.
2381 * - decoding: unused
2386 * number of reference frames
2387 * - encoding: Set by user.
2388 * - decoding: Set by lavc.
2393 * chroma qp offset from luma
2394 * - encoding: Set by user.
2395 * - decoding: unused
2400 * Influences how often B-frames are used.
2401 * - encoding: Set by user.
2402 * - decoding: unused
2407 * trellis RD quantization
2408 * - encoding: Set by user.
2409 * - decoding: unused
2414 * Reduce fluctuations in qp (before curve compression).
2415 * - encoding: Set by user.
2416 * - decoding: unused
2418 float complexityblur;
2421 * in-loop deblocking filter alphac0 parameter
2422 * alpha is in the range -6...6
2423 * - encoding: Set by user.
2424 * - decoding: unused
2429 * in-loop deblocking filter beta parameter
2430 * beta is in the range -6...6
2431 * - encoding: Set by user.
2432 * - decoding: unused
2437 * macroblock subpartition sizes to consider - p8x8, p4x4, b8x8, i8x8, i4x4
2438 * - encoding: Set by user.
2439 * - decoding: unused
2442 #define X264_PART_I4X4 0x001 /* Analyze i4x4 */
2443 #define X264_PART_I8X8 0x002 /* Analyze i8x8 (requires 8x8 transform) */
2444 #define X264_PART_P8X8 0x010 /* Analyze p16x8, p8x16 and p8x8 */
2445 #define X264_PART_P4X4 0x020 /* Analyze p8x4, p4x8, p4x4 */
2446 #define X264_PART_B8X8 0x100 /* Analyze b16x8, b8x16 and b8x8 */
2449 * direct MV prediction mode - 0 (none), 1 (spatial), 2 (temporal), 3 (auto)
2450 * - encoding: Set by user.
2451 * - decoding: unused
2456 * Audio cutoff bandwidth (0 means "automatic")
2457 * - encoding: Set by user.
2458 * - decoding: unused
2463 * Multiplied by qscale for each frame and added to scene_change_score.
2464 * - encoding: Set by user.
2465 * - decoding: unused
2467 int scenechange_factor;
2471 * Note: Value depends upon the compare function used for fullpel ME.
2472 * - encoding: Set by user.
2473 * - decoding: unused
2478 * Adjusts sensitivity of b_frame_strategy 1.
2479 * - encoding: Set by user.
2480 * - decoding: unused
2485 * - encoding: Set by user.
2486 * - decoding: unused
2488 int compression_level;
2489 #define FF_COMPRESSION_DEFAULT -1
2493 * Sets whether to use LPC mode - used by FLAC encoder.
2494 * - encoding: Set by user.
2495 * - decoding: unused
2496 * @deprecated Deprecated in favor of lpc_type and lpc_passes.
2502 * LPC coefficient precision - used by FLAC encoder
2503 * - encoding: Set by user.
2504 * - decoding: unused
2506 int lpc_coeff_precision;
2509 * - encoding: Set by user.
2510 * - decoding: unused
2512 int min_prediction_order;
2515 * - encoding: Set by user.
2516 * - decoding: unused
2518 int max_prediction_order;
2521 * search method for selecting prediction order
2522 * - encoding: Set by user.
2523 * - decoding: unused
2525 int prediction_order_method;
2528 * - encoding: Set by user.
2529 * - decoding: unused
2531 int min_partition_order;
2534 * - encoding: Set by user.
2535 * - decoding: unused
2537 int max_partition_order;
2540 * GOP timecode frame start number, in non drop frame format
2541 * - encoding: Set by user.
2542 * - decoding: unused
2544 int64_t timecode_frame_start;
2546 #if LIBAVCODEC_VERSION_MAJOR < 53
2548 * Decoder should decode to this many channels if it can (0 for default)
2549 * - encoding: unused
2550 * - decoding: Set by user.
2551 * @deprecated Deprecated in favor of request_channel_layout.
2553 int request_channels;
2557 * Percentage of dynamic range compression to be applied by the decoder.
2558 * The default value is 1.0, corresponding to full compression.
2559 * - encoding: unused
2560 * - decoding: Set by user.
2565 * opaque 64bit number (generally a PTS) that will be reordered and
2566 * output in AVFrame.reordered_opaque
2567 * - encoding: unused
2568 * - decoding: Set by user.
2570 int64_t reordered_opaque;
2573 * Bits per sample/pixel of internal libavcodec pixel/sample format.
2574 * This field is applicable only when sample_fmt is AV_SAMPLE_FMT_S32.
2575 * - encoding: set by user.
2576 * - decoding: set by libavcodec.
2578 int bits_per_raw_sample;
2581 * Audio channel layout.
2582 * - encoding: set by user.
2583 * - decoding: set by libavcodec.
2585 int64_t channel_layout;
2588 * Request decoder to use this channel layout if it can (0 for default)
2589 * - encoding: unused
2590 * - decoding: Set by user.
2592 int64_t request_channel_layout;
2595 * Ratecontrol attempt to use, at maximum, <value> of what can be used without an underflow.
2596 * - encoding: Set by user.
2597 * - decoding: unused.
2599 float rc_max_available_vbv_use;
2602 * Ratecontrol attempt to use, at least, <value> times the amount needed to prevent a vbv overflow.
2603 * - encoding: Set by user.
2604 * - decoding: unused.
2606 float rc_min_vbv_overflow_use;
2609 * Hardware accelerator in use
2610 * - encoding: unused.
2611 * - decoding: Set by libavcodec
2613 struct AVHWAccel *hwaccel;
2616 * For some codecs, the time base is closer to the field rate than the frame rate.
2617 * Most notably, H.264 and MPEG-2 specify time_base as half of frame duration
2618 * if no telecine is used ...
2620 * Set to time_base ticks per frame. Default 1, e.g., H.264/MPEG-2 set it to 2.
2622 int ticks_per_frame;
2625 * Hardware accelerator context.
2626 * For some hardware accelerators, a global context needs to be
2627 * provided by the user. In that case, this holds display-dependent
2628 * data FFmpeg cannot instantiate itself. Please refer to the
2629 * FFmpeg HW accelerator documentation to know how to fill this
2630 * is. e.g. for VA API, this is a struct vaapi_context.
2631 * - encoding: unused
2632 * - decoding: Set by user
2634 void *hwaccel_context;
2637 * Chromaticity coordinates of the source primaries.
2638 * - encoding: Set by user
2639 * - decoding: Set by libavcodec
2641 enum AVColorPrimaries color_primaries;
2644 * Color Transfer Characteristic.
2645 * - encoding: Set by user
2646 * - decoding: Set by libavcodec
2648 enum AVColorTransferCharacteristic color_trc;
2651 * YUV colorspace type.
2652 * - encoding: Set by user
2653 * - decoding: Set by libavcodec
2655 enum AVColorSpace colorspace;
2658 * MPEG vs JPEG YUV range.
2659 * - encoding: Set by user
2660 * - decoding: Set by libavcodec
2662 enum AVColorRange color_range;
2665 * This defines the location of chroma samples.
2666 * - encoding: Set by user
2667 * - decoding: Set by libavcodec
2669 enum AVChromaLocation chroma_sample_location;
2672 * The codec may call this to execute several independent things.
2673 * It will return only after finishing all tasks.
2674 * The user may replace this with some multithreaded implementation,
2675 * the default implementation will execute the parts serially.
2676 * Also see avcodec_thread_init and e.g. the --enable-pthread configure option.
2677 * @param c context passed also to func
2678 * @param count the number of things to execute
2679 * @param arg2 argument passed unchanged to func
2680 * @param ret return values of executed functions, must have space for "count" values. May be NULL.
2681 * @param func function that will be called count times, with jobnr from 0 to count-1.
2682 * threadnr will be in the range 0 to c->thread_count-1 < MAX_THREADS and so that no
2683 * two instances of func executing at the same time will have the same threadnr.
2684 * @return always 0 currently, but code should handle a future improvement where when any call to func
2685 * returns < 0 no further calls to func may be done and < 0 is returned.
2686 * - encoding: Set by libavcodec, user can override.
2687 * - decoding: Set by libavcodec, user can override.
2689 int (*execute2)(struct AVCodecContext *c, int (*func)(struct AVCodecContext *c2, void *arg, int jobnr, int threadnr), void *arg2, int *ret, int count);
2692 * explicit P-frame weighted prediction analysis method
2694 * 1: fast blind weighting (one reference duplicate with -1 offset)
2695 * 2: smart weighting (full fade detection analysis)
2696 * - encoding: Set by user.
2697 * - decoding: unused
2699 int weighted_p_pred;
2704 * 1: Variance AQ (complexity mask)
2705 * 2: Auto-variance AQ (experimental)
2706 * - encoding: Set by user
2707 * - decoding: unused
2713 * Reduces blocking and blurring in flat and textured areas.
2714 * - encoding: Set by user
2715 * - decoding: unused
2721 * Strength of psychovisual optimization
2722 * - encoding: Set by user
2723 * - decoding: unused
2729 * Strength of psychovisual optimization
2730 * - encoding: Set by user
2731 * - decoding: unused
2737 * Number of frames for frametype and ratecontrol lookahead
2738 * - encoding: Set by user
2739 * - decoding: unused
2744 * Constant rate factor maximum
2745 * With CRF encoding mode and VBV restrictions enabled, prevents quality from being worse
2746 * than crf_max, even if doing so would violate VBV restrictions.
2747 * - encoding: Set by user.
2748 * - decoding: unused
2752 int log_level_offset;
2755 * Determines which LPC analysis algorithm to use.
2756 * - encoding: Set by user
2757 * - decoding: unused
2759 enum AVLPCType lpc_type;
2762 * Number of passes to use for Cholesky factorization during LPC analysis
2763 * - encoding: Set by user
2764 * - decoding: unused
2770 * Indicates number of picture subdivisions. Used for parallelized
2772 * - encoding: Set by user
2773 * - decoding: unused
2778 * Header containing style information for text subtitles.
2779 * For SUBTITLE_ASS subtitle type, it should contain the whole ASS
2780 * [Script Info] and [V4+ Styles] section, plus the [Events] line and
2781 * the Format line following. It shouldn't include any Dialogue line.
2782 * - encoding: Set/allocated/freed by user (before avcodec_open())
2783 * - decoding: Set/allocated/freed by libavcodec (by avcodec_open())
2785 uint8_t *subtitle_header;
2786 int subtitle_header_size;
2792 typedef struct AVCodec {
2794 * Name of the codec implementation.
2795 * The name is globally unique among encoders and among decoders (but an
2796 * encoder and a decoder can share the same name).
2797 * This is the primary way to find a codec from the user perspective.
2800 enum AVMediaType type;
2803 int (*init)(AVCodecContext *);
2804 int (*encode)(AVCodecContext *, uint8_t *buf, int buf_size, void *data);
2805 int (*close)(AVCodecContext *);
2806 int (*decode)(AVCodecContext *, void *outdata, int *outdata_size, AVPacket *avpkt);
2808 * Codec capabilities.
2812 struct AVCodec *next;
2815 * Will be called when seeking
2817 void (*flush)(AVCodecContext *);
2818 const AVRational *supported_framerates; ///< array of supported framerates, or NULL if any, array is terminated by {0,0}
2819 const enum PixelFormat *pix_fmts; ///< array of supported pixel formats, or NULL if unknown, array is terminated by -1
2821 * Descriptive name for the codec, meant to be more human readable than name.
2822 * You should use the NULL_IF_CONFIG_SMALL() macro to define it.
2824 const char *long_name;
2825 const int *supported_samplerates; ///< array of supported audio samplerates, or NULL if unknown, array is terminated by 0
2826 const enum AVSampleFormat *sample_fmts; ///< array of supported sample formats, or NULL if unknown, array is terminated by -1
2827 const int64_t *channel_layouts; ///< array of support channel layouts, or NULL if unknown. array is terminated by 0
2828 uint8_t max_lowres; ///< maximum value for lowres supported by the decoder
2829 AVClass *priv_class; ///< AVClass for the private context
2835 typedef struct AVHWAccel {
2837 * Name of the hardware accelerated codec.
2838 * The name is globally unique among encoders and among decoders (but an
2839 * encoder and a decoder can share the same name).
2844 * Type of codec implemented by the hardware accelerator.
2846 * See AVMEDIA_TYPE_xxx
2848 enum AVMediaType type;
2851 * Codec implemented by the hardware accelerator.
2858 * Supported pixel format.
2860 * Only hardware accelerated formats are supported here.
2862 enum PixelFormat pix_fmt;
2865 * Hardware accelerated codec capabilities.
2866 * see FF_HWACCEL_CODEC_CAP_*
2870 struct AVHWAccel *next;
2873 * Called at the beginning of each frame or field picture.
2875 * Meaningful frame information (codec specific) is guaranteed to
2876 * be parsed at this point. This function is mandatory.
2878 * Note that buf can be NULL along with buf_size set to 0.
2879 * Otherwise, this means the whole frame is available at this point.
2881 * @param avctx the codec context
2882 * @param buf the frame data buffer base
2883 * @param buf_size the size of the frame in bytes
2884 * @return zero if successful, a negative value otherwise
2886 int (*start_frame)(AVCodecContext *avctx, const uint8_t *buf, uint32_t buf_size);
2889 * Callback for each slice.
2891 * Meaningful slice information (codec specific) is guaranteed to
2892 * be parsed at this point. This function is mandatory.
2894 * @param avctx the codec context
2895 * @param buf the slice data buffer base
2896 * @param buf_size the size of the slice in bytes
2897 * @return zero if successful, a negative value otherwise
2899 int (*decode_slice)(AVCodecContext *avctx, const uint8_t *buf, uint32_t buf_size);
2902 * Called at the end of each frame or field picture.
2904 * The whole picture is parsed at this point and can now be sent
2905 * to the hardware accelerator. This function is mandatory.
2907 * @param avctx the codec context
2908 * @return zero if successful, a negative value otherwise
2910 int (*end_frame)(AVCodecContext *avctx);
2913 * Size of HW accelerator private data.
2915 * Private data is allocated with av_mallocz() before
2916 * AVCodecContext.get_buffer() and deallocated after
2917 * AVCodecContext.release_buffer().
2923 * four components are given, that's all.
2924 * the last component is alpha
2926 typedef struct AVPicture {
2928 int linesize[4]; ///< number of bytes per line
2931 #if FF_API_PALETTE_CONTROL
2934 * This structure defines a method for communicating palette changes
2935 * between and demuxer and a decoder.
2937 * @deprecated Use AVPacket to send palette changes instead.
2938 * This is totally broken.
2940 #define AVPALETTE_SIZE 1024
2941 #define AVPALETTE_COUNT 256
2942 typedef struct AVPaletteControl {
2944 /* Demuxer sets this to 1 to indicate the palette has changed;
2945 * decoder resets to 0. */
2946 int palette_changed;
2948 /* 4-byte ARGB palette entries, stored in native byte order; note that
2949 * the individual palette components should be on a 8-bit scale; if
2950 * the palette data comes from an IBM VGA native format, the component
2951 * data is probably 6 bits in size and needs to be scaled. */
2952 unsigned int palette[AVPALETTE_COUNT];
2954 } AVPaletteControl attribute_deprecated;
2957 enum AVSubtitleType {
2960 SUBTITLE_BITMAP, ///< A bitmap, pict will be set
2963 * Plain text, the text field must be set by the decoder and is
2964 * authoritative. ass and pict fields may contain approximations.
2969 * Formatted text, the ass field must be set by the decoder and is
2970 * authoritative. pict and text fields may contain approximations.
2975 typedef struct AVSubtitleRect {
2976 int x; ///< top left corner of pict, undefined when pict is not set
2977 int y; ///< top left corner of pict, undefined when pict is not set
2978 int w; ///< width of pict, undefined when pict is not set
2979 int h; ///< height of pict, undefined when pict is not set
2980 int nb_colors; ///< number of colors in pict, undefined when pict is not set
2983 * data+linesize for the bitmap of this subtitle.
2984 * can be set for text/ass as well once they where rendered
2987 enum AVSubtitleType type;
2989 char *text; ///< 0 terminated plain UTF-8 text
2992 * 0 terminated ASS/SSA compatible event line.
2993 * The pressentation of this is unaffected by the other values in this
2999 typedef struct AVSubtitle {
3000 uint16_t format; /* 0 = graphics */
3001 uint32_t start_display_time; /* relative to packet pts, in ms */
3002 uint32_t end_display_time; /* relative to packet pts, in ms */
3004 AVSubtitleRect **rects;
3005 int64_t pts; ///< Same as packet pts, in AV_TIME_BASE
3008 /* packet functions */
3011 * @deprecated use NULL instead
3013 attribute_deprecated void av_destruct_packet_nofree(AVPacket *pkt);
3016 * Default packet destructor.
3018 void av_destruct_packet(AVPacket *pkt);
3021 * Initialize optional fields of a packet with default values.
3025 void av_init_packet(AVPacket *pkt);
3028 * Allocate the payload of a packet and initialize its fields with
3032 * @param size wanted payload size
3033 * @return 0 if OK, AVERROR_xxx otherwise
3035 int av_new_packet(AVPacket *pkt, int size);
3038 * Reduce packet size, correctly zeroing padding
3041 * @param size new size
3043 void av_shrink_packet(AVPacket *pkt, int size);
3046 * Increase packet size, correctly zeroing padding
3049 * @param grow_by number of bytes by which to increase the size of the packet
3051 int av_grow_packet(AVPacket *pkt, int grow_by);
3054 * @warning This is a hack - the packet memory allocation stuff is broken. The
3055 * packet is allocated if it was not really allocated.
3057 int av_dup_packet(AVPacket *pkt);
3062 * @param pkt packet to free
3064 void av_free_packet(AVPacket *pkt);
3068 struct ReSampleContext;
3069 struct AVResampleContext;
3071 typedef struct ReSampleContext ReSampleContext;
3073 #if FF_API_AUDIO_OLD
3075 * @deprecated Use av_audio_resample_init() instead.
3077 attribute_deprecated ReSampleContext *audio_resample_init(int output_channels, int input_channels,
3078 int output_rate, int input_rate);
3081 * Initialize audio resampling context
3083 * @param output_channels number of output channels
3084 * @param input_channels number of input channels
3085 * @param output_rate output sample rate
3086 * @param input_rate input sample rate
3087 * @param sample_fmt_out requested output sample format
3088 * @param sample_fmt_in input sample format
3089 * @param filter_length length of each FIR filter in the filterbank relative to the cutoff freq
3090 * @param log2_phase_count log2 of the number of entries in the polyphase filterbank
3091 * @param linear If 1 then the used FIR filter will be linearly interpolated
3092 between the 2 closest, if 0 the closest will be used
3093 * @param cutoff cutoff frequency, 1.0 corresponds to half the output sampling rate
3094 * @return allocated ReSampleContext, NULL if error occured
3096 ReSampleContext *av_audio_resample_init(int output_channels, int input_channels,
3097 int output_rate, int input_rate,
3098 enum AVSampleFormat sample_fmt_out,
3099 enum AVSampleFormat sample_fmt_in,
3100 int filter_length, int log2_phase_count,
3101 int linear, double cutoff);
3103 int audio_resample(ReSampleContext *s, short *output, short *input, int nb_samples);
3104 void audio_resample_close(ReSampleContext *s);
3108 * Initialize an audio resampler.
3109 * Note, if either rate is not an integer then simply scale both rates up so they are.
3110 * @param filter_length length of each FIR filter in the filterbank relative to the cutoff freq
3111 * @param log2_phase_count log2 of the number of entries in the polyphase filterbank
3112 * @param linear If 1 then the used FIR filter will be linearly interpolated
3113 between the 2 closest, if 0 the closest will be used
3114 * @param cutoff cutoff frequency, 1.0 corresponds to half the output sampling rate
3116 struct AVResampleContext *av_resample_init(int out_rate, int in_rate, int filter_length, int log2_phase_count, int linear, double cutoff);
3119 * Resample an array of samples using a previously configured context.
3120 * @param src an array of unconsumed samples
3121 * @param consumed the number of samples of src which have been consumed are returned here
3122 * @param src_size the number of unconsumed samples available
3123 * @param dst_size the amount of space in samples available in dst
3124 * @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.
3125 * @return the number of samples written in dst or -1 if an error occurred
3127 int av_resample(struct AVResampleContext *c, short *dst, short *src, int *consumed, int src_size, int dst_size, int update_ctx);
3131 * Compensate samplerate/timestamp drift. The compensation is done by changing
3132 * the resampler parameters, so no audible clicks or similar distortions occur
3133 * @param compensation_distance distance in output samples over which the compensation should be performed
3134 * @param sample_delta number of output samples which should be output less
3136 * example: av_resample_compensate(c, 10, 500)
3137 * here instead of 510 samples only 500 samples would be output
3139 * note, due to rounding the actual compensation might be slightly different,
3140 * especially if the compensation_distance is large and the in_rate used during init is small
3142 void av_resample_compensate(struct AVResampleContext *c, int sample_delta, int compensation_distance);
3143 void av_resample_close(struct AVResampleContext *c);
3146 * Allocate memory for a picture. Call avpicture_free to free it.
3148 * @param picture the picture to be filled in
3149 * @param pix_fmt the format of the picture
3150 * @param width the width of the picture
3151 * @param height the height of the picture
3152 * @return zero if successful, a negative value if not
3154 int avpicture_alloc(AVPicture *picture, enum PixelFormat pix_fmt, int width, int height);
3157 * Free a picture previously allocated by avpicture_alloc().
3159 * @param picture the AVPicture to be freed
3161 void avpicture_free(AVPicture *picture);
3164 * Fill in the AVPicture fields.
3165 * The fields of the given AVPicture are filled in by using the 'ptr' address
3166 * which points to the image data buffer. Depending on the specified picture
3167 * format, one or multiple image data pointers and line sizes will be set.
3168 * If a planar format is specified, several pointers will be set pointing to
3169 * the different picture planes and the line sizes of the different planes
3170 * will be stored in the lines_sizes array.
3171 * Call with ptr == NULL to get the required size for the ptr buffer.
3173 * @param picture AVPicture whose fields are to be filled in
3174 * @param ptr Buffer which will contain or contains the actual image data
3175 * @param pix_fmt The format in which the picture data is stored.
3176 * @param width the width of the image in pixels
3177 * @param height the height of the image in pixels
3178 * @return size of the image data in bytes
3180 int avpicture_fill(AVPicture *picture, uint8_t *ptr,
3181 enum PixelFormat pix_fmt, int width, int height);
3182 int avpicture_layout(const AVPicture* src, enum PixelFormat pix_fmt, int width, int height,
3183 unsigned char *dest, int dest_size);
3186 * Calculate the size in bytes that a picture of the given width and height
3187 * would occupy if stored in the given picture format.
3188 * Note that this returns the size of a compact representation as generated
3189 * by avpicture_layout, which can be smaller than the size required for e.g.
3192 * @param pix_fmt the given picture format
3193 * @param width the width of the image
3194 * @param height the height of the image
3195 * @return Image data size in bytes or -1 on error (e.g. too large dimensions).
3197 int avpicture_get_size(enum PixelFormat pix_fmt, int width, int height);
3198 void avcodec_get_chroma_sub_sample(enum PixelFormat pix_fmt, int *h_shift, int *v_shift);
3199 const char *avcodec_get_pix_fmt_name(enum PixelFormat pix_fmt);
3200 void avcodec_set_dimensions(AVCodecContext *s, int width, int height);
3202 #if LIBAVCODEC_VERSION_MAJOR < 53
3204 * Return the pixel format corresponding to the name name.
3206 * If there is no pixel format with name name, then look for a
3207 * pixel format with the name corresponding to the native endian
3209 * For example in a little-endian system, first look for "gray16",
3210 * then for "gray16le".
3212 * Finally if no pixel format has been found, return PIX_FMT_NONE.
3214 * @deprecated Deprecated in favor of av_get_pix_fmt().
3216 attribute_deprecated enum PixelFormat avcodec_get_pix_fmt(const char* name);
3220 * Return a value representing the fourCC code associated to the
3221 * pixel format pix_fmt, or 0 if no associated fourCC code can be
3224 unsigned int avcodec_pix_fmt_to_codec_tag(enum PixelFormat pix_fmt);
3227 * Put a string representing the codec tag codec_tag in buf.
3229 * @param buf_size size in bytes of buf
3230 * @return the length of the string that would have been generated if
3231 * enough space had been available, excluding the trailing null
3233 size_t av_get_codec_tag_string(char *buf, size_t buf_size, unsigned int codec_tag);
3235 #define FF_LOSS_RESOLUTION 0x0001 /**< loss due to resolution change */
3236 #define FF_LOSS_DEPTH 0x0002 /**< loss due to color depth change */
3237 #define FF_LOSS_COLORSPACE 0x0004 /**< loss due to color space conversion */
3238 #define FF_LOSS_ALPHA 0x0008 /**< loss of alpha bits */
3239 #define FF_LOSS_COLORQUANT 0x0010 /**< loss due to color quantization */
3240 #define FF_LOSS_CHROMA 0x0020 /**< loss of chroma (e.g. RGB to gray conversion) */
3243 * Compute what kind of losses will occur when converting from one specific
3244 * pixel format to another.
3245 * When converting from one pixel format to another, information loss may occur.
3246 * For example, when converting from RGB24 to GRAY, the color information will
3247 * be lost. Similarly, other losses occur when converting from some formats to
3248 * other formats. These losses can involve loss of chroma, but also loss of
3249 * resolution, loss of color depth, loss due to the color space conversion, loss
3250 * of the alpha bits or loss due to color quantization.
3251 * avcodec_get_fix_fmt_loss() informs you about the various types of losses
3252 * which will occur when converting from one pixel format to another.
3254 * @param[in] dst_pix_fmt destination pixel format
3255 * @param[in] src_pix_fmt source pixel format
3256 * @param[in] has_alpha Whether the source pixel format alpha channel is used.
3257 * @return Combination of flags informing you what kind of losses will occur.
3259 int avcodec_get_pix_fmt_loss(enum PixelFormat dst_pix_fmt, enum PixelFormat src_pix_fmt,
3263 * Find the best pixel format to convert to given a certain source pixel
3264 * format. When converting from one pixel format to another, information loss
3265 * may occur. For example, when converting from RGB24 to GRAY, the color
3266 * information will be lost. Similarly, other losses occur when converting from
3267 * some formats to other formats. avcodec_find_best_pix_fmt() searches which of
3268 * the given pixel formats should be used to suffer the least amount of loss.
3269 * The pixel formats from which it chooses one, are determined by the
3270 * pix_fmt_mask parameter.
3273 * src_pix_fmt = PIX_FMT_YUV420P;
3274 * pix_fmt_mask = (1 << PIX_FMT_YUV422P) || (1 << PIX_FMT_RGB24);
3275 * dst_pix_fmt = avcodec_find_best_pix_fmt(pix_fmt_mask, src_pix_fmt, alpha, &loss);
3278 * @param[in] pix_fmt_mask bitmask determining which pixel format to choose from
3279 * @param[in] src_pix_fmt source pixel format
3280 * @param[in] has_alpha Whether the source pixel format alpha channel is used.
3281 * @param[out] loss_ptr Combination of flags informing you what kind of losses will occur.
3282 * @return The best pixel format to convert to or -1 if none was found.
3284 enum PixelFormat avcodec_find_best_pix_fmt(int64_t pix_fmt_mask, enum PixelFormat src_pix_fmt,
3285 int has_alpha, int *loss_ptr);
3287 #if LIBAVCODEC_VERSION_MAJOR < 53
3289 * @deprecated Use av_get_pix_fmt_string() instead.
3291 attribute_deprecated
3292 void avcodec_pix_fmt_string (char *buf, int buf_size, enum PixelFormat pix_fmt);
3295 #define FF_ALPHA_TRANSP 0x0001 /* image has some totally transparent pixels */
3296 #define FF_ALPHA_SEMI_TRANSP 0x0002 /* image has some transparent pixels */
3299 * Tell if an image really has transparent alpha values.
3300 * @return ored mask of FF_ALPHA_xxx constants
3302 int img_get_alpha_info(const AVPicture *src,
3303 enum PixelFormat pix_fmt, int width, int height);
3305 /* deinterlace a picture */
3306 /* deinterlace - if not supported return -1 */
3307 int avpicture_deinterlace(AVPicture *dst, const AVPicture *src,
3308 enum PixelFormat pix_fmt, int width, int height);
3310 /* external high level API */
3313 * If c is NULL, returns the first registered codec,
3314 * if c is non-NULL, returns the next registered codec after c,
3315 * or NULL if c is the last one.
3317 AVCodec *av_codec_next(AVCodec *c);
3320 * Return the LIBAVCODEC_VERSION_INT constant.
3322 unsigned avcodec_version(void);
3325 * Return the libavcodec build-time configuration.
3327 const char *avcodec_configuration(void);
3330 * Return the libavcodec license.
3332 const char *avcodec_license(void);
3335 * Initialize libavcodec.
3337 * @warning This function must be called before any other libavcodec
3340 void avcodec_init(void);
3342 #if LIBAVCODEC_VERSION_MAJOR < 53
3344 * @deprecated Deprecated in favor of avcodec_register().
3346 attribute_deprecated void register_avcodec(AVCodec *codec);
3350 * Register the codec codec and initialize libavcodec.
3352 * @see avcodec_init()
3354 void avcodec_register(AVCodec *codec);
3357 * Find a registered encoder with a matching codec ID.
3359 * @param id CodecID of the requested encoder
3360 * @return An encoder if one was found, NULL otherwise.
3362 AVCodec *avcodec_find_encoder(enum CodecID id);
3365 * Find a registered encoder with the specified name.
3367 * @param name name of the requested encoder
3368 * @return An encoder if one was found, NULL otherwise.
3370 AVCodec *avcodec_find_encoder_by_name(const char *name);
3373 * Find a registered decoder with a matching codec ID.
3375 * @param id CodecID of the requested decoder
3376 * @return A decoder if one was found, NULL otherwise.
3378 AVCodec *avcodec_find_decoder(enum CodecID id);
3381 * Find a registered decoder with the specified name.
3383 * @param name name of the requested decoder
3384 * @return A decoder if one was found, NULL otherwise.
3386 AVCodec *avcodec_find_decoder_by_name(const char *name);
3387 void avcodec_string(char *buf, int buf_size, AVCodecContext *enc, int encode);
3390 * Set the fields of the given AVCodecContext to default values.
3392 * @param s The AVCodecContext of which the fields should be set to default values.
3394 void avcodec_get_context_defaults(AVCodecContext *s);
3396 /** THIS FUNCTION IS NOT YET PART OF THE PUBLIC API!
3397 * we WILL change its arguments and name a few times! */
3398 void avcodec_get_context_defaults2(AVCodecContext *s, enum AVMediaType);
3400 /** THIS FUNCTION IS NOT YET PART OF THE PUBLIC API!
3401 * we WILL change its arguments and name a few times! */
3402 int avcodec_get_context_defaults3(AVCodecContext *s, AVCodec *codec);
3405 * Allocate an AVCodecContext and set its fields to default values. The
3406 * resulting struct can be deallocated by simply calling av_free().
3408 * @return An AVCodecContext filled with default values or NULL on failure.
3409 * @see avcodec_get_context_defaults
3411 AVCodecContext *avcodec_alloc_context(void);
3413 /** THIS FUNCTION IS NOT YET PART OF THE PUBLIC API!
3414 * we WILL change its arguments and name a few times! */
3415 AVCodecContext *avcodec_alloc_context2(enum AVMediaType);
3417 /** THIS FUNCTION IS NOT YET PART OF THE PUBLIC API!
3418 * we WILL change its arguments and name a few times! */
3419 AVCodecContext *avcodec_alloc_context3(AVCodec *codec);
3422 * Copy the settings of the source AVCodecContext into the destination
3423 * AVCodecContext. The resulting destination codec context will be
3424 * unopened, i.e. you are required to call avcodec_open() before you
3425 * can use this AVCodecContext to decode/encode video/audio data.
3427 * @param dest target codec context, should be initialized with
3428 * avcodec_alloc_context(), but otherwise uninitialized
3429 * @param src source codec context
3430 * @return AVERROR() on error (e.g. memory allocation error), 0 on success
3432 int avcodec_copy_context(AVCodecContext *dest, const AVCodecContext *src);
3435 * Set the fields of the given AVFrame to default values.
3437 * @param pic The AVFrame of which the fields should be set to default values.
3439 void avcodec_get_frame_defaults(AVFrame *pic);
3442 * Allocate an AVFrame and set its fields to default values. The resulting
3443 * struct can be deallocated by simply calling av_free().
3445 * @return An AVFrame filled with default values or NULL on failure.
3446 * @see avcodec_get_frame_defaults
3448 AVFrame *avcodec_alloc_frame(void);
3450 int avcodec_default_get_buffer(AVCodecContext *s, AVFrame *pic);
3451 void avcodec_default_release_buffer(AVCodecContext *s, AVFrame *pic);
3452 int avcodec_default_reget_buffer(AVCodecContext *s, AVFrame *pic);
3455 * Return the amount of padding in pixels which the get_buffer callback must
3456 * provide around the edge of the image for codecs which do not have the
3457 * CODEC_FLAG_EMU_EDGE flag.
3459 * @return Required padding in pixels.
3461 unsigned avcodec_get_edge_width(void);
3463 * Modify width and height values so that they will result in a memory
3464 * buffer that is acceptable for the codec if you do not use any horizontal
3467 * May only be used if a codec with CODEC_CAP_DR1 has been opened.
3468 * If CODEC_FLAG_EMU_EDGE is not set, the dimensions must have been increased
3469 * according to avcodec_get_edge_width() before.
3471 void avcodec_align_dimensions(AVCodecContext *s, int *width, int *height);
3473 * Modify width and height values so that they will result in a memory
3474 * buffer that is acceptable for the codec if you also ensure that all
3475 * line sizes are a multiple of the respective linesize_align[i].
3477 * May only be used if a codec with CODEC_CAP_DR1 has been opened.
3478 * If CODEC_FLAG_EMU_EDGE is not set, the dimensions must have been increased
3479 * according to avcodec_get_edge_width() before.
3481 void avcodec_align_dimensions2(AVCodecContext *s, int *width, int *height,
3482 int linesize_align[4]);
3484 #if LIBAVCODEC_VERSION_MAJOR < 53
3486 * @deprecated Deprecated in favor of av_check_image_size().
3488 attribute_deprecated
3489 int avcodec_check_dimensions(void *av_log_ctx, unsigned int w, unsigned int h);
3492 enum PixelFormat avcodec_default_get_format(struct AVCodecContext *s, const enum PixelFormat * fmt);
3494 int avcodec_thread_init(AVCodecContext *s, int thread_count);
3495 void avcodec_thread_free(AVCodecContext *s);
3496 int avcodec_default_execute(AVCodecContext *c, int (*func)(AVCodecContext *c2, void *arg2),void *arg, int *ret, int count, int size);
3497 int avcodec_default_execute2(AVCodecContext *c, int (*func)(AVCodecContext *c2, void *arg2, int, int),void *arg, int *ret, int count);
3498 //FIXME func typedef
3501 * Initialize the AVCodecContext to use the given AVCodec. Prior to using this
3502 * function the context has to be allocated.
3504 * The functions avcodec_find_decoder_by_name(), avcodec_find_encoder_by_name(),
3505 * avcodec_find_decoder() and avcodec_find_encoder() provide an easy way for
3506 * retrieving a codec.
3508 * @warning This function is not thread safe!
3511 * avcodec_register_all();
3512 * codec = avcodec_find_decoder(CODEC_ID_H264);
3516 * context = avcodec_alloc_context();
3518 * if (avcodec_open(context, codec) < 0)
3522 * @param avctx The context which will be set up to use the given codec.
3523 * @param codec The codec to use within the context.
3524 * @return zero on success, a negative value on error
3525 * @see avcodec_alloc_context, avcodec_find_decoder, avcodec_find_encoder
3527 int avcodec_open(AVCodecContext *avctx, AVCodec *codec);
3529 #if FF_API_AUDIO_OLD
3531 * Decode an audio frame from buf into samples.
3532 * Wrapper function which calls avcodec_decode_audio3.
3534 * @deprecated Use avcodec_decode_audio3 instead.
3535 * @param avctx the codec context
3536 * @param[out] samples the output buffer
3537 * @param[in,out] frame_size_ptr the output buffer size in bytes
3538 * @param[in] buf the input buffer
3539 * @param[in] buf_size the input buffer size in bytes
3540 * @return On error a negative value is returned, otherwise the number of bytes
3541 * used or zero if no frame could be decompressed.
3543 attribute_deprecated int avcodec_decode_audio2(AVCodecContext *avctx, int16_t *samples,
3544 int *frame_size_ptr,
3545 const uint8_t *buf, int buf_size);
3549 * Decode the audio frame of size avpkt->size from avpkt->data into samples.
3550 * Some decoders may support multiple frames in a single AVPacket, such
3551 * decoders would then just decode the first frame. In this case,
3552 * avcodec_decode_audio3 has to be called again with an AVPacket that contains
3553 * the remaining data in order to decode the second frame etc.
3555 * could be outputted, frame_size_ptr is zero. Otherwise, it is the
3556 * decompressed frame size in bytes.
3558 * @warning You must set frame_size_ptr to the allocated size of the
3559 * output buffer before calling avcodec_decode_audio3().
3561 * @warning The input buffer must be FF_INPUT_BUFFER_PADDING_SIZE larger than
3562 * the actual read bytes because some optimized bitstream readers read 32 or 64
3563 * bits at once and could read over the end.
3565 * @warning The end of the input buffer avpkt->data should be set to 0 to ensure that
3566 * no overreading happens for damaged MPEG streams.
3568 * @note You might have to align the input buffer avpkt->data and output buffer
3569 * samples. The alignment requirements depend on the CPU: On some CPUs it isn't
3570 * necessary at all, on others it won't work at all if not aligned and on others
3571 * it will work but it will have an impact on performance.
3573 * In practice, avpkt->data should have 4 byte alignment at minimum and
3574 * samples should be 16 byte aligned unless the CPU doesn't need it
3575 * (AltiVec and SSE do).
3577 * @param avctx the codec context
3578 * @param[out] samples the output buffer, sample type in avctx->sample_fmt
3579 * @param[in,out] frame_size_ptr the output buffer size in bytes
3580 * @param[in] avpkt The input AVPacket containing the input buffer.
3581 * You can create such packet with av_init_packet() and by then setting
3582 * data and size, some decoders might in addition need other fields.
3583 * All decoders are designed to use the least fields possible though.
3584 * @return On error a negative value is returned, otherwise the number of bytes
3585 * used or zero if no frame data was decompressed (used) from the input AVPacket.
3587 int avcodec_decode_audio3(AVCodecContext *avctx, int16_t *samples,
3588 int *frame_size_ptr,
3591 #if FF_API_VIDEO_OLD
3593 * Decode a video frame from buf into picture.
3594 * Wrapper function which calls avcodec_decode_video2.
3596 * @deprecated Use avcodec_decode_video2 instead.
3597 * @param avctx the codec context
3598 * @param[out] picture The AVFrame in which the decoded video frame will be stored.
3599 * @param[in] buf the input buffer
3600 * @param[in] buf_size the size of the input buffer in bytes
3601 * @param[in,out] got_picture_ptr Zero if no frame could be decompressed, otherwise, it is nonzero.
3602 * @return On error a negative value is returned, otherwise the number of bytes
3603 * used or zero if no frame could be decompressed.
3605 attribute_deprecated int avcodec_decode_video(AVCodecContext *avctx, AVFrame *picture,
3606 int *got_picture_ptr,
3607 const uint8_t *buf, int buf_size);
3611 * Decode the video frame of size avpkt->size from avpkt->data into picture.
3612 * Some decoders may support multiple frames in a single AVPacket, such
3613 * decoders would then just decode the first frame.
3615 * @warning The input buffer must be FF_INPUT_BUFFER_PADDING_SIZE larger than
3616 * the actual read bytes because some optimized bitstream readers read 32 or 64
3617 * bits at once and could read over the end.
3619 * @warning The end of the input buffer buf should be set to 0 to ensure that
3620 * no overreading happens for damaged MPEG streams.
3622 * @note You might have to align the input buffer avpkt->data.
3623 * The alignment requirements depend on the CPU: on some CPUs it isn't
3624 * necessary at all, on others it won't work at all if not aligned and on others
3625 * it will work but it will have an impact on performance.
3627 * In practice, avpkt->data should have 4 byte alignment at minimum.
3629 * @note Some codecs have a delay between input and output, these need to be
3630 * fed with avpkt->data=NULL, avpkt->size=0 at the end to return the remaining frames.
3632 * @param avctx the codec context
3633 * @param[out] picture The AVFrame in which the decoded video frame will be stored.
3634 * Use avcodec_alloc_frame to get an AVFrame, the codec will
3635 * allocate memory for the actual bitmap.
3636 * with default get/release_buffer(), the decoder frees/reuses the bitmap as it sees fit.
3637 * with overridden get/release_buffer() (needs CODEC_CAP_DR1) the user decides into what buffer the decoder
3638 * decodes and the decoder tells the user once it does not need the data anymore,
3639 * the user app can at this point free/reuse/keep the memory as it sees fit.
3641 * @param[in] avpkt The input AVpacket containing the input buffer.
3642 * You can create such packet with av_init_packet() and by then setting
3643 * data and size, some decoders might in addition need other fields like
3644 * flags&AV_PKT_FLAG_KEY. All decoders are designed to use the least
3646 * @param[in,out] got_picture_ptr Zero if no frame could be decompressed, otherwise, it is nonzero.
3647 * @return On error a negative value is returned, otherwise the number of bytes
3648 * used or zero if no frame could be decompressed.
3650 int avcodec_decode_video2(AVCodecContext *avctx, AVFrame *picture,
3651 int *got_picture_ptr,
3654 #if FF_API_SUBTITLE_OLD
3655 /* Decode a subtitle message. Return -1 if error, otherwise return the
3656 * number of bytes used. If no subtitle could be decompressed,
3657 * got_sub_ptr is zero. Otherwise, the subtitle is stored in *sub. */
3658 attribute_deprecated int avcodec_decode_subtitle(AVCodecContext *avctx, AVSubtitle *sub,
3660 const uint8_t *buf, int buf_size);
3664 * Decode a subtitle message.
3665 * Return a negative value on error, otherwise return the number of bytes used.
3666 * If no subtitle could be decompressed, got_sub_ptr is zero.
3667 * Otherwise, the subtitle is stored in *sub.
3668 * Note that CODEC_CAP_DR1 is not available for subtitle codecs. This is for
3669 * simplicity, because the performance difference is expect to be negligible
3670 * and reusing a get_buffer written for video codecs would probably perform badly
3671 * due to a potentially very different allocation pattern.
3673 * @param avctx the codec context
3674 * @param[out] sub The AVSubtitle in which the decoded subtitle will be stored, must be
3675 freed with avsubtitle_free if *got_sub_ptr is set.
3676 * @param[in,out] got_sub_ptr Zero if no subtitle could be decompressed, otherwise, it is nonzero.
3677 * @param[in] avpkt The input AVPacket containing the input buffer.
3679 int avcodec_decode_subtitle2(AVCodecContext *avctx, AVSubtitle *sub,
3684 * Frees all allocated data in the given subtitle struct.
3686 * @param sub AVSubtitle to free.
3688 void avsubtitle_free(AVSubtitle *sub);
3690 int avcodec_parse_frame(AVCodecContext *avctx, uint8_t **pdata,
3692 uint8_t *buf, int buf_size);
3695 * Encode an audio frame from samples into buf.
3697 * @note The output buffer should be at least FF_MIN_BUFFER_SIZE bytes large.
3698 * However, for PCM audio the user will know how much space is needed
3699 * because it depends on the value passed in buf_size as described
3700 * below. In that case a lower value can be used.
3702 * @param avctx the codec context
3703 * @param[out] buf the output buffer
3704 * @param[in] buf_size the output buffer size
3705 * @param[in] samples the input buffer containing the samples
3706 * The number of samples read from this buffer is frame_size*channels,
3707 * both of which are defined in avctx.
3708 * For PCM audio the number of samples read from samples is equal to
3709 * buf_size * input_sample_size / output_sample_size.
3710 * @return On error a negative value is returned, on success zero or the number
3711 * of bytes used to encode the data read from the input buffer.
3713 int avcodec_encode_audio(AVCodecContext *avctx, uint8_t *buf, int buf_size,
3714 const short *samples);
3717 * Encode a video frame from pict into buf.
3718 * The input picture should be
3719 * stored using a specific format, namely avctx.pix_fmt.
3721 * @param avctx the codec context
3722 * @param[out] buf the output buffer for the bitstream of encoded frame
3723 * @param[in] buf_size the size of the output buffer in bytes
3724 * @param[in] pict the input picture to encode
3725 * @return On error a negative value is returned, on success zero or the number
3726 * of bytes used from the output buffer.
3728 int avcodec_encode_video(AVCodecContext *avctx, uint8_t *buf, int buf_size,
3729 const AVFrame *pict);
3730 int avcodec_encode_subtitle(AVCodecContext *avctx, uint8_t *buf, int buf_size,
3731 const AVSubtitle *sub);
3733 int avcodec_close(AVCodecContext *avctx);
3736 * Register all the codecs, parsers and bitstream filters which were enabled at
3737 * configuration time. If you do not call this function you can select exactly
3738 * which formats you want to support, by using the individual registration
3741 * @see avcodec_register
3742 * @see av_register_codec_parser
3743 * @see av_register_bitstream_filter
3745 void avcodec_register_all(void);
3748 * Flush buffers, should be called when seeking or when switching to a different stream.
3750 void avcodec_flush_buffers(AVCodecContext *avctx);
3752 void avcodec_default_free_buffers(AVCodecContext *s);
3754 /* misc useful functions */
3757 * Return a single letter to describe the given picture type pict_type.
3759 * @param[in] pict_type the picture type
3760 * @return A single character representing the picture type.
3762 char av_get_pict_type_char(int pict_type);
3765 * Return codec bits per sample.
3767 * @param[in] codec_id the codec
3768 * @return Number of bits per sample or zero if unknown for the given codec.
3770 int av_get_bits_per_sample(enum CodecID codec_id);
3772 #if FF_API_OLD_SAMPLE_FMT
3774 * @deprecated Use av_get_bits_per_sample_fmt() instead.
3776 attribute_deprecated
3777 int av_get_bits_per_sample_format(enum AVSampleFormat sample_fmt);
3781 typedef struct AVCodecParserContext {
3783 struct AVCodecParser *parser;
3784 int64_t frame_offset; /* offset of the current frame */
3785 int64_t cur_offset; /* current offset
3786 (incremented by each av_parser_parse()) */
3787 int64_t next_frame_offset; /* offset of the next frame */
3789 int pict_type; /* XXX: Put it back in AVCodecContext. */
3791 * This field is used for proper frame duration computation in lavf.
3792 * It signals, how much longer the frame duration of the current frame
3793 * is compared to normal frame duration.
3795 * frame_duration = (1 + repeat_pict) * time_base
3797 * It is used by codecs like H.264 to display telecined material.
3799 int repeat_pict; /* XXX: Put it back in AVCodecContext. */
3800 int64_t pts; /* pts of the current frame */
3801 int64_t dts; /* dts of the current frame */
3806 int fetch_timestamp;
3808 #define AV_PARSER_PTS_NB 4
3809 int cur_frame_start_index;
3810 int64_t cur_frame_offset[AV_PARSER_PTS_NB];
3811 int64_t cur_frame_pts[AV_PARSER_PTS_NB];
3812 int64_t cur_frame_dts[AV_PARSER_PTS_NB];
3815 #define PARSER_FLAG_COMPLETE_FRAMES 0x0001
3816 #define PARSER_FLAG_ONCE 0x0002
3817 /// Set if the parser has a valid file offset
3818 #define PARSER_FLAG_FETCHED_OFFSET 0x0004
3820 int64_t offset; ///< byte offset from starting packet start
3821 int64_t cur_frame_end[AV_PARSER_PTS_NB];
3824 * Set by parser to 1 for key frames and 0 for non-key frames.
3825 * It is initialized to -1, so if the parser doesn't set this flag,
3826 * old-style fallback using FF_I_TYPE picture type as key frames
3832 * Time difference in stream time base units from the pts of this
3833 * packet to the point at which the output from the decoder has converged
3834 * independent from the availability of previous frames. That is, the
3835 * frames are virtually identical no matter if decoding started from
3836 * the very first frame or from this keyframe.
3837 * Is AV_NOPTS_VALUE if unknown.
3838 * This field is not the display duration of the current frame.
3839 * This field has no meaning if the packet does not have AV_PKT_FLAG_KEY
3842 * The purpose of this field is to allow seeking in streams that have no
3843 * keyframes in the conventional sense. It corresponds to the
3844 * recovery point SEI in H.264 and match_time_delta in NUT. It is also
3845 * essential for some types of subtitle streams to ensure that all
3846 * subtitles are correctly displayed after seeking.
3848 int64_t convergence_duration;
3850 // Timestamp generation support:
3852 * Synchronization point for start of timestamp generation.
3854 * Set to >0 for sync point, 0 for no sync point and <0 for undefined
3857 * For example, this corresponds to presence of H.264 buffering period
3863 * Offset of the current timestamp against last timestamp sync point in
3864 * units of AVCodecContext.time_base.
3866 * Set to INT_MIN when dts_sync_point unused. Otherwise, it must
3867 * contain a valid timestamp offset.
3869 * Note that the timestamp of sync point has usually a nonzero
3870 * dts_ref_dts_delta, which refers to the previous sync point. Offset of
3871 * the next frame after timestamp sync point will be usually 1.
3873 * For example, this corresponds to H.264 cpb_removal_delay.
3875 int dts_ref_dts_delta;
3878 * Presentation delay of current frame in units of AVCodecContext.time_base.
3880 * Set to INT_MIN when dts_sync_point unused. Otherwise, it must
3881 * contain valid non-negative timestamp delta (presentation time of a frame
3882 * must not lie in the past).
3884 * This delay represents the difference between decoding and presentation
3885 * time of the frame.
3887 * For example, this corresponds to H.264 dpb_output_delay.
3892 * Position of the packet in file.
3894 * Analogous to cur_frame_pts/dts
3896 int64_t cur_frame_pos[AV_PARSER_PTS_NB];
3899 * Byte position of currently parsed frame in stream.
3904 * Previous frame byte position.
3907 } AVCodecParserContext;
3909 typedef struct AVCodecParser {
3910 int codec_ids[5]; /* several codec IDs are permitted */
3912 int (*parser_init)(AVCodecParserContext *s);
3913 int (*parser_parse)(AVCodecParserContext *s,
3914 AVCodecContext *avctx,
3915 const uint8_t **poutbuf, int *poutbuf_size,
3916 const uint8_t *buf, int buf_size);
3917 void (*parser_close)(AVCodecParserContext *s);
3918 int (*split)(AVCodecContext *avctx, const uint8_t *buf, int buf_size);
3919 struct AVCodecParser *next;
3922 AVCodecParser *av_parser_next(AVCodecParser *c);
3924 void av_register_codec_parser(AVCodecParser *parser);
3925 AVCodecParserContext *av_parser_init(int codec_id);
3927 #if LIBAVCODEC_VERSION_MAJOR < 53
3928 attribute_deprecated
3929 int av_parser_parse(AVCodecParserContext *s,
3930 AVCodecContext *avctx,
3931 uint8_t **poutbuf, int *poutbuf_size,
3932 const uint8_t *buf, int buf_size,
3933 int64_t pts, int64_t dts);
3939 * @param s parser context.
3940 * @param avctx codec context.
3941 * @param poutbuf set to pointer to parsed buffer or NULL if not yet finished.
3942 * @param poutbuf_size set to size of parsed buffer or zero if not yet finished.
3943 * @param buf input buffer.
3944 * @param buf_size input length, to signal EOF, this should be 0 (so that the last frame can be output).
3945 * @param pts input presentation timestamp.
3946 * @param dts input decoding timestamp.
3947 * @param pos input byte position in stream.
3948 * @return the number of bytes of the input bitstream used.
3953 * len = av_parser_parse2(myparser, AVCodecContext, &data, &size,
3960 * decode_frame(data, size);
3964 int av_parser_parse2(AVCodecParserContext *s,
3965 AVCodecContext *avctx,
3966 uint8_t **poutbuf, int *poutbuf_size,
3967 const uint8_t *buf, int buf_size,
3968 int64_t pts, int64_t dts,
3971 int av_parser_change(AVCodecParserContext *s,
3972 AVCodecContext *avctx,
3973 uint8_t **poutbuf, int *poutbuf_size,
3974 const uint8_t *buf, int buf_size, int keyframe);
3975 void av_parser_close(AVCodecParserContext *s);
3978 typedef struct AVBitStreamFilterContext {
3980 struct AVBitStreamFilter *filter;
3981 AVCodecParserContext *parser;
3982 struct AVBitStreamFilterContext *next;
3983 } AVBitStreamFilterContext;
3986 typedef struct AVBitStreamFilter {
3989 int (*filter)(AVBitStreamFilterContext *bsfc,
3990 AVCodecContext *avctx, const char *args,
3991 uint8_t **poutbuf, int *poutbuf_size,
3992 const uint8_t *buf, int buf_size, int keyframe);
3993 void (*close)(AVBitStreamFilterContext *bsfc);
3994 struct AVBitStreamFilter *next;
3995 } AVBitStreamFilter;
3997 void av_register_bitstream_filter(AVBitStreamFilter *bsf);
3998 AVBitStreamFilterContext *av_bitstream_filter_init(const char *name);
3999 int av_bitstream_filter_filter(AVBitStreamFilterContext *bsfc,
4000 AVCodecContext *avctx, const char *args,
4001 uint8_t **poutbuf, int *poutbuf_size,
4002 const uint8_t *buf, int buf_size, int keyframe);
4003 void av_bitstream_filter_close(AVBitStreamFilterContext *bsf);
4005 AVBitStreamFilter *av_bitstream_filter_next(AVBitStreamFilter *f);
4010 * Reallocate the given block if it is not large enough, otherwise do nothing.
4014 void *av_fast_realloc(void *ptr, unsigned int *size, FF_INTERNALC_MEM_TYPE min_size);
4017 * Allocate a buffer, reusing the given one if large enough.
4019 * Contrary to av_fast_realloc the current buffer contents might not be
4020 * preserved and on error the old buffer is freed, thus no special
4021 * handling to avoid memleaks is necessary.
4023 * @param ptr pointer to pointer to already allocated buffer, overwritten with pointer to new buffer
4024 * @param size size of the buffer *ptr points to
4025 * @param min_size minimum size of *ptr buffer after returning, *ptr will be NULL and
4026 * *size 0 if an error occurred.
4028 void av_fast_malloc(void *ptr, unsigned int *size, FF_INTERNALC_MEM_TYPE min_size);
4030 #if LIBAVCODEC_VERSION_MAJOR < 53
4032 * @deprecated Deprecated in favor of av_image_copy().
4034 attribute_deprecated
4035 void av_picture_data_copy(uint8_t *dst_data[4], int dst_linesize[4],
4036 uint8_t *src_data[4], int src_linesize[4],
4037 enum PixelFormat pix_fmt, int width, int height);
4041 * Copy image src to dst. Wraps av_picture_data_copy() above.
4043 void av_picture_copy(AVPicture *dst, const AVPicture *src,
4044 enum PixelFormat pix_fmt, int width, int height);
4047 * Crop image top and left side.
4049 int av_picture_crop(AVPicture *dst, const AVPicture *src,
4050 enum PixelFormat pix_fmt, int top_band, int left_band);
4055 int av_picture_pad(AVPicture *dst, const AVPicture *src, int height, int width, enum PixelFormat pix_fmt,
4056 int padtop, int padbottom, int padleft, int padright, int *color);
4059 * Encode extradata length to a buffer. Used by xiph codecs.
4061 * @param s buffer to write to; must be at least (v/255+1) bytes long
4062 * @param v size of extradata in bytes
4063 * @return number of bytes written to the buffer.
4065 unsigned int av_xiphlacing(unsigned char *s, unsigned int v);
4067 #if LIBAVCODEC_VERSION_MAJOR < 53
4069 * Parse str and put in width_ptr and height_ptr the detected values.
4071 * @deprecated Deprecated in favor of av_parse_video_size().
4073 attribute_deprecated int av_parse_video_frame_size(int *width_ptr, int *height_ptr, const char *str);
4076 * Parse str and store the detected values in *frame_rate.
4078 * @deprecated Deprecated in favor of av_parse_video_rate().
4080 attribute_deprecated int av_parse_video_frame_rate(AVRational *frame_rate, const char *str);
4084 * Logs a generic warning message about a missing feature. This function is
4085 * intended to be used internally by FFmpeg (libavcodec, libavformat, etc.)
4086 * only, and would normally not be used by applications.
4087 * @param[in] avc a pointer to an arbitrary struct of which the first field is
4088 * a pointer to an AVClass struct
4089 * @param[in] feature string containing the name of the missing feature
4090 * @param[in] want_sample indicates if samples are wanted which exhibit this feature.
4091 * If want_sample is non-zero, additional verbage will be added to the log
4092 * message which tells the user how to report samples to the development
4095 void av_log_missing_feature(void *avc, const char *feature, int want_sample);
4098 * Log a generic warning message asking for a sample. This function is
4099 * intended to be used internally by FFmpeg (libavcodec, libavformat, etc.)
4100 * only, and would normally not be used by applications.
4101 * @param[in] avc a pointer to an arbitrary struct of which the first field is
4102 * a pointer to an AVClass struct
4103 * @param[in] msg string containing an optional message, or NULL if no message
4105 void av_log_ask_for_sample(void *avc, const char *msg);
4108 * Register the hardware accelerator hwaccel.
4110 void av_register_hwaccel(AVHWAccel *hwaccel);
4113 * If hwaccel is NULL, returns the first registered hardware accelerator,
4114 * if hwaccel is non-NULL, returns the next registered hardware accelerator
4115 * after hwaccel, or NULL if hwaccel is the last one.
4117 AVHWAccel *av_hwaccel_next(AVHWAccel *hwaccel);
4121 * Lock operation used by lockmgr
4124 AV_LOCK_CREATE, ///< Create a mutex
4125 AV_LOCK_OBTAIN, ///< Lock the mutex
4126 AV_LOCK_RELEASE, ///< Unlock the mutex
4127 AV_LOCK_DESTROY, ///< Free mutex resources
4131 * Register a user provided lock manager supporting the operations
4132 * specified by AVLockOp. mutex points to a (void *) where the
4133 * lockmgr should store/get a pointer to a user allocated mutex. It's
4134 * NULL upon AV_LOCK_CREATE and != NULL for all other ops.
4136 * @param cb User defined callback. Note: FFmpeg may invoke calls to this
4137 * callback during the call to av_lockmgr_register().
4138 * Thus, the application must be prepared to handle that.
4139 * If cb is set to NULL the lockmgr will be unregistered.
4140 * Also note that during unregistration the previously registered
4141 * lockmgr callback may also be invoked.
4143 int av_lockmgr_register(int (*cb)(void **mutex, enum AVLockOp op));
4145 #endif /* AVCODEC_AVCODEC_H */