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 94
36 #define LIBAVCODEC_VERSION_MICRO 2
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)
83 #define AV_NOPTS_VALUE INT64_C(0x8000000000000000)
84 #define AV_TIME_BASE 1000000
85 #define AV_TIME_BASE_Q (AVRational){1, AV_TIME_BASE}
88 * Identify the syntax and semantics of the bitstream.
89 * The principle is roughly:
90 * Two decoders with the same ID can decode the same streams.
91 * Two encoders with the same ID can encode compatible streams.
92 * There may be slight deviations from the principle due to implementation
95 * If you add a codec ID to this list, add it so that
96 * 1. no value of a existing codec ID changes (that would break ABI),
97 * 2. it is as close as possible to similar codecs.
104 CODEC_ID_MPEG2VIDEO, ///< preferred ID for MPEG-1/2 video decoding
105 CODEC_ID_MPEG2VIDEO_XVMC,
142 CODEC_ID_INTERPLAY_VIDEO,
154 CODEC_ID_TRUEMOTION1,
165 #if LIBAVCODEC_VERSION_MAJOR < 53
184 CODEC_ID_TRUEMOTION2,
201 CODEC_ID_DSICINVIDEO,
202 CODEC_ID_TIERTEXSEQVIDEO,
211 CODEC_ID_BETHSOFTVID,
229 CODEC_ID_MOTIONPIXELS,
247 CODEC_ID_IFF_BYTERUN1,
257 /* various PCM "codecs" */
258 CODEC_ID_PCM_S16LE= 0x10000,
274 CODEC_ID_PCM_S24DAUD,
276 CODEC_ID_PCM_S16LE_PLANAR,
285 /* various ADPCM codecs */
286 CODEC_ID_ADPCM_IMA_QT= 0x11000,
287 CODEC_ID_ADPCM_IMA_WAV,
288 CODEC_ID_ADPCM_IMA_DK3,
289 CODEC_ID_ADPCM_IMA_DK4,
290 CODEC_ID_ADPCM_IMA_WS,
291 CODEC_ID_ADPCM_IMA_SMJPEG,
300 CODEC_ID_ADPCM_YAMAHA,
301 CODEC_ID_ADPCM_SBPRO_4,
302 CODEC_ID_ADPCM_SBPRO_3,
303 CODEC_ID_ADPCM_SBPRO_2,
305 CODEC_ID_ADPCM_IMA_AMV,
306 CODEC_ID_ADPCM_EA_R1,
307 CODEC_ID_ADPCM_EA_R3,
308 CODEC_ID_ADPCM_EA_R2,
309 CODEC_ID_ADPCM_IMA_EA_SEAD,
310 CODEC_ID_ADPCM_IMA_EA_EACS,
311 CODEC_ID_ADPCM_EA_XAS,
312 CODEC_ID_ADPCM_EA_MAXIS_XA,
313 CODEC_ID_ADPCM_IMA_ISS,
317 CODEC_ID_AMR_NB= 0x12000,
320 /* RealAudio codecs*/
321 CODEC_ID_RA_144= 0x13000,
324 /* various DPCM codecs */
325 CODEC_ID_ROQ_DPCM= 0x14000,
326 CODEC_ID_INTERPLAY_DPCM,
331 CODEC_ID_MP2= 0x15000,
332 CODEC_ID_MP3, ///< preferred ID for decoding MPEG audio layer 1, 2 or 3
350 CODEC_ID_WESTWOOD_SND1,
351 CODEC_ID_GSM, ///< as in Berlin toast format
359 CODEC_ID_DSICINAUDIO,
363 CODEC_ID_GSM_MS, /* as found in WAV */
372 CODEC_ID_WMALOSSLESS,
381 CODEC_ID_BINKAUDIO_RDFT,
382 CODEC_ID_BINKAUDIO_DCT,
385 /* subtitle codecs */
386 CODEC_ID_DVD_SUBTITLE= 0x17000,
387 CODEC_ID_DVB_SUBTITLE,
388 CODEC_ID_TEXT, ///< raw UTF-8 text
392 CODEC_ID_HDMV_PGS_SUBTITLE,
393 CODEC_ID_DVB_TELETEXT,
396 /* other specific kind of codecs (generally used for attachments) */
397 CODEC_ID_TTF= 0x18000,
399 CODEC_ID_PROBE= 0x19000, ///< codec_id is not known (like CODEC_ID_NONE) but lavf should attempt to identify it
401 CODEC_ID_MPEG2TS= 0x20000, /**< _FAKE_ codec to indicate a raw MPEG-2 TS
402 * stream (only used by libavformat) */
405 #if LIBAVCODEC_VERSION_MAJOR < 53
406 #define CodecType AVMediaType
408 #define CODEC_TYPE_UNKNOWN AVMEDIA_TYPE_UNKNOWN
409 #define CODEC_TYPE_VIDEO AVMEDIA_TYPE_VIDEO
410 #define CODEC_TYPE_AUDIO AVMEDIA_TYPE_AUDIO
411 #define CODEC_TYPE_DATA AVMEDIA_TYPE_DATA
412 #define CODEC_TYPE_SUBTITLE AVMEDIA_TYPE_SUBTITLE
413 #define CODEC_TYPE_ATTACHMENT AVMEDIA_TYPE_ATTACHMENT
414 #define CODEC_TYPE_NB AVMEDIA_TYPE_NB
417 #if FF_API_OLD_SAMPLE_FMT
418 #define SampleFormat AVSampleFormat
420 #define SAMPLE_FMT_NONE AV_SAMPLE_FMT_NONE
421 #define SAMPLE_FMT_U8 AV_SAMPLE_FMT_U8
422 #define SAMPLE_FMT_S16 AV_SAMPLE_FMT_S16
423 #define SAMPLE_FMT_S32 AV_SAMPLE_FMT_S32
424 #define SAMPLE_FMT_FLT AV_SAMPLE_FMT_FLT
425 #define SAMPLE_FMT_DBL AV_SAMPLE_FMT_DBL
426 #define SAMPLE_FMT_NB AV_SAMPLE_FMT_NB
429 /* Audio channel masks */
430 #define CH_FRONT_LEFT 0x00000001
431 #define CH_FRONT_RIGHT 0x00000002
432 #define CH_FRONT_CENTER 0x00000004
433 #define CH_LOW_FREQUENCY 0x00000008
434 #define CH_BACK_LEFT 0x00000010
435 #define CH_BACK_RIGHT 0x00000020
436 #define CH_FRONT_LEFT_OF_CENTER 0x00000040
437 #define CH_FRONT_RIGHT_OF_CENTER 0x00000080
438 #define CH_BACK_CENTER 0x00000100
439 #define CH_SIDE_LEFT 0x00000200
440 #define CH_SIDE_RIGHT 0x00000400
441 #define CH_TOP_CENTER 0x00000800
442 #define CH_TOP_FRONT_LEFT 0x00001000
443 #define CH_TOP_FRONT_CENTER 0x00002000
444 #define CH_TOP_FRONT_RIGHT 0x00004000
445 #define CH_TOP_BACK_LEFT 0x00008000
446 #define CH_TOP_BACK_CENTER 0x00010000
447 #define CH_TOP_BACK_RIGHT 0x00020000
448 #define CH_STEREO_LEFT 0x20000000 ///< Stereo downmix.
449 #define CH_STEREO_RIGHT 0x40000000 ///< See CH_STEREO_LEFT.
451 /** Channel mask value used for AVCodecContext.request_channel_layout
452 to indicate that the user requests the channel order of the decoder output
453 to be the native codec channel order. */
454 #define CH_LAYOUT_NATIVE 0x8000000000000000LL
456 /* Audio channel convenience macros */
457 #define CH_LAYOUT_MONO (CH_FRONT_CENTER)
458 #define CH_LAYOUT_STEREO (CH_FRONT_LEFT|CH_FRONT_RIGHT)
459 #define CH_LAYOUT_2_1 (CH_LAYOUT_STEREO|CH_BACK_CENTER)
460 #define CH_LAYOUT_SURROUND (CH_LAYOUT_STEREO|CH_FRONT_CENTER)
461 #define CH_LAYOUT_4POINT0 (CH_LAYOUT_SURROUND|CH_BACK_CENTER)
462 #define CH_LAYOUT_2_2 (CH_LAYOUT_STEREO|CH_SIDE_LEFT|CH_SIDE_RIGHT)
463 #define CH_LAYOUT_QUAD (CH_LAYOUT_STEREO|CH_BACK_LEFT|CH_BACK_RIGHT)
464 #define CH_LAYOUT_5POINT0 (CH_LAYOUT_SURROUND|CH_SIDE_LEFT|CH_SIDE_RIGHT)
465 #define CH_LAYOUT_5POINT1 (CH_LAYOUT_5POINT0|CH_LOW_FREQUENCY)
466 #define CH_LAYOUT_5POINT0_BACK (CH_LAYOUT_SURROUND|CH_BACK_LEFT|CH_BACK_RIGHT)
467 #define CH_LAYOUT_5POINT1_BACK (CH_LAYOUT_5POINT0_BACK|CH_LOW_FREQUENCY)
468 #define CH_LAYOUT_7POINT0 (CH_LAYOUT_5POINT0|CH_BACK_LEFT|CH_BACK_RIGHT)
469 #define CH_LAYOUT_7POINT1 (CH_LAYOUT_5POINT1|CH_BACK_LEFT|CH_BACK_RIGHT)
470 #define CH_LAYOUT_7POINT1_WIDE (CH_LAYOUT_5POINT1_BACK|\
471 CH_FRONT_LEFT_OF_CENTER|CH_FRONT_RIGHT_OF_CENTER)
472 #define CH_LAYOUT_STEREO_DOWNMIX (CH_STEREO_LEFT|CH_STEREO_RIGHT)
475 #define AVCODEC_MAX_AUDIO_FRAME_SIZE 192000 // 1 second of 48khz 32bit audio
478 * Required number of additionally allocated bytes at the end of the input bitstream for decoding.
479 * This is mainly needed because some optimized bitstream readers read
480 * 32 or 64 bit at once and could read over the end.<br>
481 * Note: If the first 23 bits of the additional bytes are not 0, then damaged
482 * MPEG bitstreams could cause overread and segfault.
484 #define FF_INPUT_BUFFER_PADDING_SIZE 8
487 * minimum encoding buffer size
488 * Used to avoid some checks during header writing.
490 #define FF_MIN_BUFFER_SIZE 16384
494 * motion estimation type.
497 ME_ZERO = 1, ///< no search, that is use 0,0 vector whenever one is needed
501 ME_EPZS, ///< enhanced predictive zonal search
502 ME_X1, ///< reserved for experiments
503 ME_HEX, ///< hexagon based search
504 ME_UMH, ///< uneven multi-hexagon search
505 ME_ITER, ///< iterative search
506 ME_TESA, ///< transformed exhaustive search algorithm
510 /* We leave some space between them for extensions (drop some
511 * keyframes for intra-only or drop just some bidir frames). */
512 AVDISCARD_NONE =-16, ///< discard nothing
513 AVDISCARD_DEFAULT= 0, ///< discard useless packets like 0 size packets in avi
514 AVDISCARD_NONREF = 8, ///< discard all non reference
515 AVDISCARD_BIDIR = 16, ///< discard all bidirectional frames
516 AVDISCARD_NONKEY = 32, ///< discard all frames except keyframes
517 AVDISCARD_ALL = 48, ///< discard all
520 enum AVColorPrimaries{
521 AVCOL_PRI_BT709 =1, ///< also ITU-R BT1361 / IEC 61966-2-4 / SMPTE RP177 Annex B
522 AVCOL_PRI_UNSPECIFIED=2,
524 AVCOL_PRI_BT470BG =5, ///< also ITU-R BT601-6 625 / ITU-R BT1358 625 / ITU-R BT1700 625 PAL & SECAM
525 AVCOL_PRI_SMPTE170M =6, ///< also ITU-R BT601-6 525 / ITU-R BT1358 525 / ITU-R BT1700 NTSC
526 AVCOL_PRI_SMPTE240M =7, ///< functionally identical to above
528 AVCOL_PRI_NB , ///< Not part of ABI
531 enum AVColorTransferCharacteristic{
532 AVCOL_TRC_BT709 =1, ///< also ITU-R BT1361
533 AVCOL_TRC_UNSPECIFIED=2,
534 AVCOL_TRC_GAMMA22 =4, ///< also ITU-R BT470M / ITU-R BT1700 625 PAL & SECAM
535 AVCOL_TRC_GAMMA28 =5, ///< also ITU-R BT470BG
536 AVCOL_TRC_NB , ///< Not part of ABI
541 AVCOL_SPC_BT709 =1, ///< also ITU-R BT1361 / IEC 61966-2-4 xvYCC709 / SMPTE RP177 Annex B
542 AVCOL_SPC_UNSPECIFIED=2,
544 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
545 AVCOL_SPC_SMPTE170M =6, ///< also ITU-R BT601-6 525 / ITU-R BT1358 525 / ITU-R BT1700 NTSC / functionally identical to above
546 AVCOL_SPC_SMPTE240M =7,
547 AVCOL_SPC_NB , ///< Not part of ABI
551 AVCOL_RANGE_UNSPECIFIED=0,
552 AVCOL_RANGE_MPEG =1, ///< the normal 219*2^(n-8) "MPEG" YUV ranges
553 AVCOL_RANGE_JPEG =2, ///< the normal 2^n-1 "JPEG" YUV ranges
554 AVCOL_RANGE_NB , ///< Not part of ABI
558 * X X 3 4 X X are luma samples,
559 * 1 2 1-6 are possible chroma positions
560 * X X 5 6 X 0 is undefined/unknown position
562 enum AVChromaLocation{
563 AVCHROMA_LOC_UNSPECIFIED=0,
564 AVCHROMA_LOC_LEFT =1, ///< mpeg2/4, h264 default
565 AVCHROMA_LOC_CENTER =2, ///< mpeg1, jpeg, h263
566 AVCHROMA_LOC_TOPLEFT =3, ///< DV
568 AVCHROMA_LOC_BOTTOMLEFT =5,
569 AVCHROMA_LOC_BOTTOM =6,
570 AVCHROMA_LOC_NB , ///< Not part of ABI
577 AV_LPC_TYPE_DEFAULT = -1, ///< use the codec default LPC type
578 AV_LPC_TYPE_NONE = 0, ///< do not use LPC prediction or use all zero coefficients
579 AV_LPC_TYPE_FIXED = 1, ///< fixed LPC coefficients
580 AV_LPC_TYPE_LEVINSON = 2, ///< Levinson-Durbin recursion
581 AV_LPC_TYPE_CHOLESKY = 3, ///< Cholesky factorization
582 AV_LPC_TYPE_NB , ///< Not part of ABI
585 typedef struct RcOverride{
588 int qscale; // If this is 0 then quality_factor will be used instead.
589 float quality_factor;
592 #define FF_MAX_B_FRAMES 16
595 These flags can be passed in AVCodecContext.flags before initialization.
596 Note: Not everything is supported yet.
599 #define CODEC_FLAG_QSCALE 0x0002 ///< Use fixed qscale.
600 #define CODEC_FLAG_4MV 0x0004 ///< 4 MV per MB allowed / advanced prediction for H.263.
601 #define CODEC_FLAG_QPEL 0x0010 ///< Use qpel MC.
602 #define CODEC_FLAG_GMC 0x0020 ///< Use GMC.
603 #define CODEC_FLAG_MV0 0x0040 ///< Always try a MB with MV=<0,0>.
604 #define CODEC_FLAG_PART 0x0080 ///< Use data partitioning.
606 * The parent program guarantees that the input for B-frames containing
607 * streams is not written to for at least s->max_b_frames+1 frames, if
608 * this is not set the input will be copied.
610 #define CODEC_FLAG_INPUT_PRESERVED 0x0100
611 #define CODEC_FLAG_PASS1 0x0200 ///< Use internal 2pass ratecontrol in first pass mode.
612 #define CODEC_FLAG_PASS2 0x0400 ///< Use internal 2pass ratecontrol in second pass mode.
613 #define CODEC_FLAG_EXTERN_HUFF 0x1000 ///< Use external Huffman table (for MJPEG).
614 #define CODEC_FLAG_GRAY 0x2000 ///< Only decode/encode grayscale.
615 #define CODEC_FLAG_EMU_EDGE 0x4000 ///< Don't draw edges.
616 #define CODEC_FLAG_PSNR 0x8000 ///< error[?] variables will be set during encoding.
617 #define CODEC_FLAG_TRUNCATED 0x00010000 /** Input bitstream might be truncated at a random
618 location instead of only at frame boundaries. */
619 #define CODEC_FLAG_NORMALIZE_AQP 0x00020000 ///< Normalize adaptive quantization.
620 #define CODEC_FLAG_INTERLACED_DCT 0x00040000 ///< Use interlaced DCT.
621 #define CODEC_FLAG_LOW_DELAY 0x00080000 ///< Force low delay.
622 #define CODEC_FLAG_ALT_SCAN 0x00100000 ///< Use alternate scan.
623 #define CODEC_FLAG_GLOBAL_HEADER 0x00400000 ///< Place global headers in extradata instead of every keyframe.
624 #define CODEC_FLAG_BITEXACT 0x00800000 ///< Use only bitexact stuff (except (I)DCT).
625 /* Fx : Flag for h263+ extra options */
626 #define CODEC_FLAG_AC_PRED 0x01000000 ///< H.263 advanced intra coding / MPEG-4 AC prediction
627 #define CODEC_FLAG_H263P_UMV 0x02000000 ///< unlimited motion vector
628 #define CODEC_FLAG_CBP_RD 0x04000000 ///< Use rate distortion optimization for cbp.
629 #define CODEC_FLAG_QP_RD 0x08000000 ///< Use rate distortion optimization for qp selectioon.
630 #define CODEC_FLAG_H263P_AIV 0x00000008 ///< H.263 alternative inter VLC
631 #define CODEC_FLAG_OBMC 0x00000001 ///< OBMC
632 #define CODEC_FLAG_LOOP_FILTER 0x00000800 ///< loop filter
633 #define CODEC_FLAG_H263P_SLICE_STRUCT 0x10000000
634 #define CODEC_FLAG_INTERLACED_ME 0x20000000 ///< interlaced motion estimation
635 #define CODEC_FLAG_SVCD_SCAN_OFFSET 0x40000000 ///< Will reserve space for SVCD scan offset user data.
636 #define CODEC_FLAG_CLOSED_GOP 0x80000000
637 #define CODEC_FLAG2_FAST 0x00000001 ///< Allow non spec compliant speedup tricks.
638 #define CODEC_FLAG2_STRICT_GOP 0x00000002 ///< Strictly enforce GOP size.
639 #define CODEC_FLAG2_NO_OUTPUT 0x00000004 ///< Skip bitstream encoding.
640 #define CODEC_FLAG2_LOCAL_HEADER 0x00000008 ///< Place global headers at every keyframe instead of in extradata.
641 #define CODEC_FLAG2_BPYRAMID 0x00000010 ///< H.264 allow B-frames to be used as references.
642 #define CODEC_FLAG2_WPRED 0x00000020 ///< H.264 weighted biprediction for B-frames
643 #define CODEC_FLAG2_MIXED_REFS 0x00000040 ///< H.264 one reference per partition, as opposed to one reference per macroblock
644 #define CODEC_FLAG2_8X8DCT 0x00000080 ///< H.264 high profile 8x8 transform
645 #define CODEC_FLAG2_FASTPSKIP 0x00000100 ///< H.264 fast pskip
646 #define CODEC_FLAG2_AUD 0x00000200 ///< H.264 access unit delimiters
647 #define CODEC_FLAG2_BRDO 0x00000400 ///< B-frame rate-distortion optimization
648 #define CODEC_FLAG2_INTRA_VLC 0x00000800 ///< Use MPEG-2 intra VLC table.
649 #define CODEC_FLAG2_MEMC_ONLY 0x00001000 ///< Only do ME/MC (I frames -> ref, P frame -> ME+MC).
650 #define CODEC_FLAG2_DROP_FRAME_TIMECODE 0x00002000 ///< timecode is in drop frame format.
651 #define CODEC_FLAG2_SKIP_RD 0x00004000 ///< RD optimal MB level residual skipping
652 #define CODEC_FLAG2_CHUNKS 0x00008000 ///< Input bitstream might be truncated at a packet boundaries instead of only at frame boundaries.
653 #define CODEC_FLAG2_NON_LINEAR_QUANT 0x00010000 ///< Use MPEG-2 nonlinear quantizer.
654 #define CODEC_FLAG2_BIT_RESERVOIR 0x00020000 ///< Use a bit reservoir when encoding if possible
655 #define CODEC_FLAG2_MBTREE 0x00040000 ///< Use macroblock tree ratecontrol (x264 only)
656 #define CODEC_FLAG2_PSY 0x00080000 ///< Use psycho visual optimizations.
657 #define CODEC_FLAG2_SSIM 0x00100000 ///< Compute SSIM during encoding, error[] values are undefined.
658 #define CODEC_FLAG2_INTRA_REFRESH 0x00200000 ///< Use periodic insertion of intra blocks instead of keyframes.
660 /* Unsupported options :
661 * Syntax Arithmetic coding (SAC)
662 * Reference Picture Selection
663 * Independent Segment Decoding */
665 /* codec capabilities */
667 #define CODEC_CAP_DRAW_HORIZ_BAND 0x0001 ///< Decoder can use draw_horiz_band callback.
669 * Codec uses get_buffer() for allocating buffers and supports custom allocators.
670 * If not set, it might not use get_buffer() at all or use operations that
671 * assume the buffer was allocated by avcodec_default_get_buffer.
673 #define CODEC_CAP_DR1 0x0002
674 /* If 'parse_only' field is true, then avcodec_parse_frame() can be used. */
675 #define CODEC_CAP_PARSE_ONLY 0x0004
676 #define CODEC_CAP_TRUNCATED 0x0008
677 /* Codec can export data for HW decoding (XvMC). */
678 #define CODEC_CAP_HWACCEL 0x0010
680 * Codec has a nonzero delay and needs to be fed with NULL at the end to get the delayed data.
681 * If this is not set, the codec is guaranteed to never be fed with NULL data.
683 #define CODEC_CAP_DELAY 0x0020
685 * Codec can be fed a final frame with a smaller size.
686 * This can be used to prevent truncation of the last audio samples.
688 #define CODEC_CAP_SMALL_LAST_FRAME 0x0040
690 * Codec can export data for HW decoding (VDPAU).
692 #define CODEC_CAP_HWACCEL_VDPAU 0x0080
694 * Codec can output multiple frames per AVPacket
695 * Normally demuxers return one frame at a time, demuxers which do not do
696 * are connected to a parser to split what they return into proper frames.
697 * This flag is reserved to the very rare category of codecs which have a
698 * bitstream that cannot be split into frames without timeconsuming
699 * operations like full decoding. Demuxers carring such bitstreams thus
700 * may return multiple frames in a packet. This has many disadvantages like
701 * prohibiting stream copy in many cases thus it should only be considered
704 #define CODEC_CAP_SUBFRAMES 0x0100
706 * Codec is experimental and is thus avoided in favor of non experimental
709 #define CODEC_CAP_EXPERIMENTAL 0x0200
711 * Codec should fill in channel configuration and samplerate instead of container
713 #define CODEC_CAP_CHANNEL_CONF 0x0400
716 //The following defines may change, don't expect compatibility if you use them.
717 #define MB_TYPE_INTRA4x4 0x0001
718 #define MB_TYPE_INTRA16x16 0x0002 //FIXME H.264-specific
719 #define MB_TYPE_INTRA_PCM 0x0004 //FIXME H.264-specific
720 #define MB_TYPE_16x16 0x0008
721 #define MB_TYPE_16x8 0x0010
722 #define MB_TYPE_8x16 0x0020
723 #define MB_TYPE_8x8 0x0040
724 #define MB_TYPE_INTERLACED 0x0080
725 #define MB_TYPE_DIRECT2 0x0100 //FIXME
726 #define MB_TYPE_ACPRED 0x0200
727 #define MB_TYPE_GMC 0x0400
728 #define MB_TYPE_SKIP 0x0800
729 #define MB_TYPE_P0L0 0x1000
730 #define MB_TYPE_P1L0 0x2000
731 #define MB_TYPE_P0L1 0x4000
732 #define MB_TYPE_P1L1 0x8000
733 #define MB_TYPE_L0 (MB_TYPE_P0L0 | MB_TYPE_P1L0)
734 #define MB_TYPE_L1 (MB_TYPE_P0L1 | MB_TYPE_P1L1)
735 #define MB_TYPE_L0L1 (MB_TYPE_L0 | MB_TYPE_L1)
736 #define MB_TYPE_QUANT 0x00010000
737 #define MB_TYPE_CBP 0x00020000
738 //Note bits 24-31 are reserved for codec specific use (h264 ref0, mpeg1 0mv, ...)
742 * This specifies the area which should be displayed.
743 * Note there may be multiple such areas for one frame.
745 typedef struct AVPanScan{
748 * - encoding: Set by user.
749 * - decoding: Set by libavcodec.
754 * width and height in 1/16 pel
755 * - encoding: Set by user.
756 * - decoding: Set by libavcodec.
762 * position of the top left corner in 1/16 pel for up to 3 fields/frames
763 * - encoding: Set by user.
764 * - decoding: Set by libavcodec.
766 int16_t position[3][2];
769 #define FF_COMMON_FRAME \
771 * pointer to the picture planes.\
772 * This might be different from the first allocated byte\
779 * pointer to the first allocated byte of the picture. Can be used in get_buffer/release_buffer.\
780 * This isn't used by libavcodec unless the default get/release_buffer() is used.\
786 * 1 -> keyframe, 0-> not\
787 * - encoding: Set by libavcodec.\
788 * - decoding: Set by libavcodec.\
793 * Picture type of the frame, see ?_TYPE below.\
794 * - encoding: Set by libavcodec. for coded_picture (and set by user for input).\
795 * - decoding: Set by libavcodec.\
800 * presentation timestamp in time_base units (time when frame should be shown to user)\
801 * If AV_NOPTS_VALUE then frame_rate = 1/time_base will be assumed.\
802 * - encoding: MUST be set by user.\
803 * - decoding: Set by libavcodec.\
808 * picture number in bitstream order\
809 * - encoding: set by\
810 * - decoding: Set by libavcodec.\
812 int coded_picture_number;\
814 * picture number in display order\
815 * - encoding: set by\
816 * - decoding: Set by libavcodec.\
818 int display_picture_number;\
821 * quality (between 1 (good) and FF_LAMBDA_MAX (bad)) \
822 * - encoding: Set by libavcodec. for coded_picture (and set by user for input).\
823 * - decoding: Set by libavcodec.\
828 * buffer age (1->was last buffer and dint change, 2->..., ...).\
829 * Set to INT_MAX if the buffer has not been used yet.\
830 * - encoding: unused\
831 * - decoding: MUST be set by get_buffer().\
836 * is this picture used as reference\
837 * The values for this are the same as the MpegEncContext.picture_structure\
838 * variable, that is 1->top field, 2->bottom field, 3->frame/both fields.\
839 * Set to 4 for delayed, non-reference frames.\
840 * - encoding: unused\
841 * - decoding: Set by libavcodec. (before get_buffer() call)).\
847 * - encoding: unused\
848 * - decoding: Set by libavcodec.\
850 int8_t *qscale_table;\
853 * - encoding: unused\
854 * - decoding: Set by libavcodec.\
859 * mbskip_table[mb]>=1 if MB didn't change\
860 * stride= mb_width = (width+15)>>4\
861 * - encoding: unused\
862 * - decoding: Set by libavcodec.\
864 uint8_t *mbskip_table;\
867 * motion vector table\
870 * int mv_sample_log2= 4 - motion_subsample_log2;\
871 * int mb_width= (width+15)>>4;\
872 * int mv_stride= (mb_width << mv_sample_log2) + 1;\
873 * motion_val[direction][x + y*mv_stride][0->mv_x, 1->mv_y];\
875 * - encoding: Set by user.\
876 * - decoding: Set by libavcodec.\
878 int16_t (*motion_val[2])[2];\
881 * macroblock type table\
882 * mb_type_base + mb_width + 2\
883 * - encoding: Set by user.\
884 * - decoding: Set by libavcodec.\
889 * log2 of the size of the block which a single vector in motion_val represents: \
890 * (4->16x16, 3->8x8, 2-> 4x4, 1-> 2x2)\
891 * - encoding: unused\
892 * - decoding: Set by libavcodec.\
894 uint8_t motion_subsample_log2;\
897 * for some private data of the user\
898 * - encoding: unused\
899 * - decoding: Set by user.\
905 * - encoding: Set by libavcodec. if flags&CODEC_FLAG_PSNR.\
906 * - decoding: unused\
911 * type of the buffer (to keep track of who has to deallocate data[*])\
912 * - encoding: Set by the one who allocates it.\
913 * - decoding: Set by the one who allocates it.\
914 * Note: User allocated (direct rendering) & internal buffers cannot coexist currently.\
919 * When decoding, this signals how much the picture must be delayed.\
920 * extra_delay = repeat_pict / (2*fps)\
921 * - encoding: unused\
922 * - decoding: Set by libavcodec.\
932 * The content of the picture is interlaced.\
933 * - encoding: Set by user.\
934 * - decoding: Set by libavcodec. (default 0)\
936 int interlaced_frame;\
939 * If the content is interlaced, is top field displayed first.\
940 * - encoding: Set by user.\
941 * - decoding: Set by libavcodec.\
943 int top_field_first;\
947 * - encoding: Set by user.\
948 * - decoding: Set by libavcodec.\
950 AVPanScan *pan_scan;\
953 * Tell user application that palette has changed from previous frame.\
954 * - encoding: ??? (no palette-enabled encoder yet)\
955 * - decoding: Set by libavcodec. (default 0).\
957 int palette_has_changed;\
960 * codec suggestion on buffer type if != 0\
961 * - encoding: unused\
962 * - decoding: Set by libavcodec. (before get_buffer() call)).\
968 * - encoding: unused\
969 * - decoding: Set by libavcodec.\
974 * motion reference frame index\
975 * the order in which these are stored can depend on the codec.\
976 * - encoding: Set by user.\
977 * - decoding: Set by libavcodec.\
979 int8_t *ref_index[2];\
982 * reordered opaque 64bit number (generally a PTS) from AVCodecContext.reordered_opaque\
983 * output in AVFrame.reordered_opaque\
984 * - encoding: unused\
985 * - decoding: Read by user.\
987 int64_t reordered_opaque;\
990 * hardware accelerator private data (FFmpeg allocated)\
991 * - encoding: unused\
992 * - decoding: Set by libavcodec\
994 void *hwaccel_picture_private;\
997 #define FF_QSCALE_TYPE_MPEG1 0
998 #define FF_QSCALE_TYPE_MPEG2 1
999 #define FF_QSCALE_TYPE_H264 2
1000 #define FF_QSCALE_TYPE_VP56 3
1002 #define FF_BUFFER_TYPE_INTERNAL 1
1003 #define FF_BUFFER_TYPE_USER 2 ///< direct rendering buffers (image is (de)allocated by user)
1004 #define FF_BUFFER_TYPE_SHARED 4 ///< Buffer from somewhere else; don't deallocate image (data/base), all other tables are not shared.
1005 #define FF_BUFFER_TYPE_COPY 8 ///< Just a (modified) copy of some other buffer, don't deallocate anything.
1008 #define FF_I_TYPE 1 ///< Intra
1009 #define FF_P_TYPE 2 ///< Predicted
1010 #define FF_B_TYPE 3 ///< Bi-dir predicted
1011 #define FF_S_TYPE 4 ///< S(GMC)-VOP MPEG4
1012 #define FF_SI_TYPE 5 ///< Switching Intra
1013 #define FF_SP_TYPE 6 ///< Switching Predicted
1014 #define FF_BI_TYPE 7
1016 #define FF_BUFFER_HINTS_VALID 0x01 // Buffer hints value is meaningful (if 0 ignore).
1017 #define FF_BUFFER_HINTS_READABLE 0x02 // Codec will read from buffer.
1018 #define FF_BUFFER_HINTS_PRESERVE 0x04 // User must not alter buffer content.
1019 #define FF_BUFFER_HINTS_REUSABLE 0x08 // Codec will reuse the buffer (update).
1021 typedef struct AVPacket {
1023 * Presentation timestamp in AVStream->time_base units; the time at which
1024 * the decompressed packet will be presented to the user.
1025 * Can be AV_NOPTS_VALUE if it is not stored in the file.
1026 * pts MUST be larger or equal to dts as presentation cannot happen before
1027 * decompression, unless one wants to view hex dumps. Some formats misuse
1028 * the terms dts and pts/cts to mean something different. Such timestamps
1029 * must be converted to true pts/dts before they are stored in AVPacket.
1033 * Decompression timestamp in AVStream->time_base units; the time at which
1034 * the packet is decompressed.
1035 * Can be AV_NOPTS_VALUE if it is not stored in the file.
1043 * Duration of this packet in AVStream->time_base units, 0 if unknown.
1044 * Equals next_pts - this_pts in presentation order.
1047 void (*destruct)(struct AVPacket *);
1049 int64_t pos; ///< byte position in stream, -1 if unknown
1052 * Time difference in AVStream->time_base units from the pts of this
1053 * packet to the point at which the output from the decoder has converged
1054 * independent from the availability of previous frames. That is, the
1055 * frames are virtually identical no matter if decoding started from
1056 * the very first frame or from this keyframe.
1057 * Is AV_NOPTS_VALUE if unknown.
1058 * This field is not the display duration of the current packet.
1059 * This field has no meaning if the packet does not have AV_PKT_FLAG_KEY
1062 * The purpose of this field is to allow seeking in streams that have no
1063 * keyframes in the conventional sense. It corresponds to the
1064 * recovery point SEI in H.264 and match_time_delta in NUT. It is also
1065 * essential for some types of subtitle streams to ensure that all
1066 * subtitles are correctly displayed after seeking.
1068 int64_t convergence_duration;
1070 #define AV_PKT_FLAG_KEY 0x0001
1071 #if LIBAVCODEC_VERSION_MAJOR < 53
1072 #define PKT_FLAG_KEY AV_PKT_FLAG_KEY
1076 * Audio Video Frame.
1077 * New fields can be added to the end of FF_COMMON_FRAME with minor version
1079 * Removal, reordering and changes to existing fields require a major
1080 * version bump. No fields should be added into AVFrame before or after
1082 * sizeof(AVFrame) must not be used outside libav*.
1084 typedef struct AVFrame {
1089 * main external API structure.
1090 * New fields can be added to the end with minor version bumps.
1091 * Removal, reordering and changes to existing fields require a major
1093 * sizeof(AVCodecContext) must not be used outside libav*.
1095 typedef struct AVCodecContext {
1097 * information on struct for av_log
1098 * - set by avcodec_alloc_context
1100 const AVClass *av_class;
1102 * the average bitrate
1103 * - encoding: Set by user; unused for constant quantizer encoding.
1104 * - decoding: Set by libavcodec. 0 or some bitrate if this info is available in the stream.
1109 * number of bits the bitstream is allowed to diverge from the reference.
1110 * the reference can be CBR (for CBR pass1) or VBR (for pass2)
1111 * - encoding: Set by user; unused for constant quantizer encoding.
1112 * - decoding: unused
1114 int bit_rate_tolerance;
1118 * - encoding: Set by user.
1119 * - decoding: Set by user.
1124 * Some codecs need additional format info. It is stored here.
1125 * If any muxer uses this then ALL demuxers/parsers AND encoders for the
1126 * specific codec MUST set it correctly otherwise stream copy breaks.
1127 * In general use of this field by muxers is not recommanded.
1128 * - encoding: Set by libavcodec.
1129 * - decoding: Set by libavcodec. (FIXME: Is this OK?)
1134 * Motion estimation algorithm used for video coding.
1135 * 1 (zero), 2 (full), 3 (log), 4 (phods), 5 (epzs), 6 (x1), 7 (hex),
1136 * 8 (umh), 9 (iter), 10 (tesa) [7, 8, 10 are x264 specific, 9 is snow specific]
1137 * - encoding: MUST be set by user.
1138 * - decoding: unused
1143 * some codecs need / can use extradata like Huffman tables.
1144 * mjpeg: Huffman tables
1145 * rv10: additional flags
1146 * mpeg4: global headers (they can be in the bitstream or here)
1147 * The allocated memory should be FF_INPUT_BUFFER_PADDING_SIZE bytes larger
1148 * than extradata_size to avoid prolems if it is read with the bitstream reader.
1149 * The bytewise contents of extradata must not depend on the architecture or CPU endianness.
1150 * - encoding: Set/allocated/freed by libavcodec.
1151 * - decoding: Set/allocated/freed by user.
1157 * This is the fundamental unit of time (in seconds) in terms
1158 * of which frame timestamps are represented. For fixed-fps content,
1159 * timebase should be 1/framerate and timestamp increments should be
1161 * - encoding: MUST be set by user.
1162 * - decoding: Set by libavcodec.
1164 AVRational time_base;
1168 * picture width / height.
1169 * - encoding: MUST be set by user.
1170 * - decoding: Set by libavcodec.
1171 * Note: For compatibility it is possible to set this instead of
1172 * coded_width/height before decoding.
1176 #define FF_ASPECT_EXTENDED 15
1179 * the number of pictures in a group of pictures, or 0 for intra_only
1180 * - encoding: Set by user.
1181 * - decoding: unused
1186 * Pixel format, see PIX_FMT_xxx.
1187 * May be set by the demuxer if known from headers.
1188 * May be overriden by the decoder if it knows better.
1189 * - encoding: Set by user.
1190 * - decoding: Set by user if known, overridden by libavcodec if known
1192 enum PixelFormat pix_fmt;
1195 * Frame rate emulation. If not zero, the lower layer (i.e. format handler)
1196 * has to read frames at native frame rate.
1197 * - encoding: Set by user.
1198 * - decoding: unused
1203 * If non NULL, 'draw_horiz_band' is called by the libavcodec
1204 * decoder to draw a horizontal band. It improves cache usage. Not
1205 * all codecs can do that. You must check the codec capabilities
1207 * The function is also used by hardware acceleration APIs.
1208 * It is called at least once during frame decoding to pass
1209 * the data needed for hardware render.
1210 * In that mode instead of pixel data, AVFrame points to
1211 * a structure specific to the acceleration API. The application
1212 * reads the structure and can change some fields to indicate progress
1214 * - encoding: unused
1215 * - decoding: Set by user.
1216 * @param height the height of the slice
1217 * @param y the y position of the slice
1218 * @param type 1->top field, 2->bottom field, 3->frame
1219 * @param offset offset into the AVFrame.data from which the slice should be read
1221 void (*draw_horiz_band)(struct AVCodecContext *s,
1222 const AVFrame *src, int offset[4],
1223 int y, int type, int height);
1226 int sample_rate; ///< samples per second
1227 int channels; ///< number of audio channels
1230 * audio sample format
1231 * - encoding: Set by user.
1232 * - decoding: Set by libavcodec.
1234 enum SampleFormat sample_fmt; ///< sample format
1236 /* The following data should not be initialized. */
1238 * Samples per packet, initialized when calling 'init'.
1241 int frame_number; ///< audio or video frame number
1242 #if LIBAVCODEC_VERSION_MAJOR < 53
1243 int real_pict_num; ///< Returns the real picture number of previous encoded frame.
1247 * Number of frames the decoded output will be delayed relative to
1248 * the encoded input.
1249 * - encoding: Set by libavcodec.
1250 * - decoding: unused
1254 /* - encoding parameters */
1255 float qcompress; ///< amount of qscale change between easy & hard scenes (0.0-1.0)
1256 float qblur; ///< amount of qscale smoothing over time (0.0-1.0)
1260 * - encoding: Set by user.
1261 * - decoding: unused
1267 * - encoding: Set by user.
1268 * - decoding: unused
1273 * maximum quantizer difference between frames
1274 * - encoding: Set by user.
1275 * - decoding: unused
1280 * maximum number of B-frames between non-B-frames
1281 * Note: The output will be delayed by max_b_frames+1 relative to the input.
1282 * - encoding: Set by user.
1283 * - decoding: unused
1288 * qscale factor between IP and B-frames
1289 * If > 0 then the last P-frame quantizer will be used (q= lastp_q*factor+offset).
1290 * If < 0 then normal ratecontrol will be done (q= -normal_q*factor+offset).
1291 * - encoding: Set by user.
1292 * - decoding: unused
1294 float b_quant_factor;
1296 /** obsolete FIXME remove */
1298 #define FF_RC_STRATEGY_XVID 1
1300 int b_frame_strategy;
1304 * - encoding: unused
1305 * - decoding: Set by user. 1-> Skip B-frames, 2-> Skip IDCT/dequant too, 5-> Skip everything except header
1306 * @deprecated Deprecated in favor of skip_idct and skip_frame.
1310 struct AVCodec *codec;
1314 int rtp_payload_size; /* The size of the RTP payload: the coder will */
1315 /* do its best to deliver a chunk with size */
1316 /* below rtp_payload_size, the chunk will start */
1317 /* with a start code on some codecs like H.263. */
1318 /* This doesn't take account of any particular */
1319 /* headers inside the transmitted RTP payload. */
1322 /* The RTP callback: This function is called */
1323 /* every time the encoder has a packet to send. */
1324 /* It depends on the encoder if the data starts */
1325 /* with a Start Code (it should). H.263 does. */
1326 /* mb_nb contains the number of macroblocks */
1327 /* encoded in the RTP payload. */
1328 void (*rtp_callback)(struct AVCodecContext *avctx, void *data, int size, int mb_nb);
1330 /* statistics, used for 2-pass encoding */
1341 * number of bits used for the previously encoded frame
1342 * - encoding: Set by libavcodec.
1343 * - decoding: unused
1348 * Private data of the user, can be used to carry app specific stuff.
1349 * - encoding: Set by user.
1350 * - decoding: Set by user.
1354 char codec_name[32];
1355 enum AVMediaType codec_type; /* see AVMEDIA_TYPE_xxx */
1356 enum CodecID codec_id; /* see CODEC_ID_xxx */
1359 * fourcc (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A').
1360 * This is used to work around some encoder bugs.
1361 * A demuxer should set this to what is stored in the field used to identify the codec.
1362 * If there are multiple such fields in a container then the demuxer should choose the one
1363 * which maximizes the information about the used codec.
1364 * If the codec tag field in a container is larger then 32 bits then the demuxer should
1365 * remap the longer ID to 32 bits with a table or other structure. Alternatively a new
1366 * extra_codec_tag + size could be added but for this a clear advantage must be demonstrated
1368 * - encoding: Set by user, if not then the default based on codec_id will be used.
1369 * - decoding: Set by user, will be converted to uppercase by libavcodec during init.
1371 unsigned int codec_tag;
1374 * Work around bugs in encoders which sometimes cannot be detected automatically.
1375 * - encoding: Set by user
1376 * - decoding: Set by user
1378 int workaround_bugs;
1379 #define FF_BUG_AUTODETECT 1 ///< autodetection
1380 #define FF_BUG_OLD_MSMPEG4 2
1381 #define FF_BUG_XVID_ILACE 4
1382 #define FF_BUG_UMP4 8
1383 #define FF_BUG_NO_PADDING 16
1384 #define FF_BUG_AMV 32
1385 #define FF_BUG_AC_VLC 0 ///< Will be removed, libavcodec can now handle these non-compliant files by default.
1386 #define FF_BUG_QPEL_CHROMA 64
1387 #define FF_BUG_STD_QPEL 128
1388 #define FF_BUG_QPEL_CHROMA2 256
1389 #define FF_BUG_DIRECT_BLOCKSIZE 512
1390 #define FF_BUG_EDGE 1024
1391 #define FF_BUG_HPEL_CHROMA 2048
1392 #define FF_BUG_DC_CLIP 4096
1393 #define FF_BUG_MS 8192 ///< Work around various bugs in Microsoft's broken decoders.
1394 #define FF_BUG_TRUNCATED 16384
1395 //#define FF_BUG_FAKE_SCALABILITY 16 //Autodetection should work 100%.
1398 * luma single coefficient elimination threshold
1399 * - encoding: Set by user.
1400 * - decoding: unused
1402 int luma_elim_threshold;
1405 * chroma single coeff elimination threshold
1406 * - encoding: Set by user.
1407 * - decoding: unused
1409 int chroma_elim_threshold;
1412 * strictly follow the standard (MPEG4, ...).
1413 * - encoding: Set by user.
1414 * - decoding: Set by user.
1415 * Setting this to STRICT or higher means the encoder and decoder will
1416 * generally do stupid things, whereas setting it to unofficial or lower
1417 * will mean the encoder might produce output that is not supported by all
1418 * spec-compliant decoders. Decoders don't differentiate between normal,
1419 * unofficial and experimental (that is, they always try to decode things
1420 * when they can) unless they are explicitly asked to behave stupidly
1421 * (=strictly conform to the specs)
1423 int strict_std_compliance;
1424 #define FF_COMPLIANCE_VERY_STRICT 2 ///< Strictly conform to an older more strict version of the spec or reference software.
1425 #define FF_COMPLIANCE_STRICT 1 ///< Strictly conform to all the things in the spec no matter what consequences.
1426 #define FF_COMPLIANCE_NORMAL 0
1427 #if FF_API_INOFFICIAL
1428 #define FF_COMPLIANCE_INOFFICIAL -1 ///< Allow inofficial extensions (deprecated - use FF_COMPLIANCE_UNOFFICIAL instead).
1430 #define FF_COMPLIANCE_UNOFFICIAL -1 ///< Allow unofficial extensions
1431 #define FF_COMPLIANCE_EXPERIMENTAL -2 ///< Allow nonstandardized experimental things.
1434 * qscale offset between IP and B-frames
1435 * - encoding: Set by user.
1436 * - decoding: unused
1438 float b_quant_offset;
1441 * Error recognization; higher values will detect more errors but may
1442 * misdetect some more or less valid parts as errors.
1443 * - encoding: unused
1444 * - decoding: Set by user.
1446 int error_recognition;
1447 #define FF_ER_CAREFUL 1
1448 #define FF_ER_COMPLIANT 2
1449 #define FF_ER_AGGRESSIVE 3
1450 #define FF_ER_VERY_AGGRESSIVE 4
1453 * Called at the beginning of each frame to get a buffer for it.
1454 * If pic.reference is set then the frame will be read later by libavcodec.
1455 * avcodec_align_dimensions2() should be used to find the required width and
1456 * height, as they normally need to be rounded up to the next multiple of 16.
1457 * if CODEC_CAP_DR1 is not set then get_buffer() must call
1458 * avcodec_default_get_buffer() instead of providing buffers allocated by
1460 * - encoding: unused
1461 * - decoding: Set by libavcodec, user can override.
1463 int (*get_buffer)(struct AVCodecContext *c, AVFrame *pic);
1466 * Called to release buffers which were allocated with get_buffer.
1467 * A released buffer can be reused in get_buffer().
1468 * pic.data[*] must be set to NULL.
1469 * - encoding: unused
1470 * - decoding: Set by libavcodec, user can override.
1472 void (*release_buffer)(struct AVCodecContext *c, AVFrame *pic);
1475 * Size of the frame reordering buffer in the decoder.
1476 * For MPEG-2 it is 1 IPB or 0 low delay IP.
1477 * - encoding: Set by libavcodec.
1478 * - decoding: Set by libavcodec.
1483 * number of bytes per packet if constant and known or 0
1484 * Used by some WAV based audio codecs.
1488 int parse_only; /* - decoding only: If true, only parsing is done
1489 (function avcodec_parse_frame()). The frame
1490 data is returned. Only MPEG codecs support this now. */
1493 * 0-> h263 quant 1-> mpeg quant
1494 * - encoding: Set by user.
1495 * - decoding: unused
1500 * pass1 encoding statistics output buffer
1501 * - encoding: Set by libavcodec.
1502 * - decoding: unused
1507 * pass2 encoding statistics input buffer
1508 * Concatenated stuff from stats_out of pass1 should be placed here.
1509 * - encoding: Allocated/set/freed by user.
1510 * - decoding: unused
1515 * ratecontrol qmin qmax limiting method
1516 * 0-> clipping, 1-> use a nice continous function to limit qscale wthin qmin/qmax.
1517 * - encoding: Set by user.
1518 * - decoding: unused
1526 * ratecontrol override, see RcOverride
1527 * - encoding: Allocated/set/freed by user.
1528 * - decoding: unused
1530 RcOverride *rc_override;
1531 int rc_override_count;
1534 * rate control equation
1535 * - encoding: Set by user
1536 * - decoding: unused
1542 * - encoding: Set by user.
1543 * - decoding: unused
1549 * - encoding: Set by user.
1550 * - decoding: unused
1555 * decoder bitstream buffer size
1556 * - encoding: Set by user.
1557 * - decoding: unused
1560 float rc_buffer_aggressivity;
1563 * qscale factor between P and I-frames
1564 * If > 0 then the last p frame quantizer will be used (q= lastp_q*factor+offset).
1565 * If < 0 then normal ratecontrol will be done (q= -normal_q*factor+offset).
1566 * - encoding: Set by user.
1567 * - decoding: unused
1569 float i_quant_factor;
1572 * qscale offset between P and I-frames
1573 * - encoding: Set by user.
1574 * - decoding: unused
1576 float i_quant_offset;
1579 * initial complexity for pass1 ratecontrol
1580 * - encoding: Set by user.
1581 * - decoding: unused
1583 float rc_initial_cplx;
1586 * DCT algorithm, see FF_DCT_* below
1587 * - encoding: Set by user.
1588 * - decoding: unused
1591 #define FF_DCT_AUTO 0
1592 #define FF_DCT_FASTINT 1
1593 #define FF_DCT_INT 2
1594 #define FF_DCT_MMX 3
1595 #define FF_DCT_MLIB 4
1596 #define FF_DCT_ALTIVEC 5
1597 #define FF_DCT_FAAN 6
1600 * luminance masking (0-> disabled)
1601 * - encoding: Set by user.
1602 * - decoding: unused
1607 * temporary complexity masking (0-> disabled)
1608 * - encoding: Set by user.
1609 * - decoding: unused
1611 float temporal_cplx_masking;
1614 * spatial complexity masking (0-> disabled)
1615 * - encoding: Set by user.
1616 * - decoding: unused
1618 float spatial_cplx_masking;
1621 * p block masking (0-> disabled)
1622 * - encoding: Set by user.
1623 * - decoding: unused
1628 * darkness masking (0-> disabled)
1629 * - encoding: Set by user.
1630 * - decoding: unused
1635 * IDCT algorithm, see FF_IDCT_* below.
1636 * - encoding: Set by user.
1637 * - decoding: Set by user.
1640 #define FF_IDCT_AUTO 0
1641 #define FF_IDCT_INT 1
1642 #define FF_IDCT_SIMPLE 2
1643 #define FF_IDCT_SIMPLEMMX 3
1644 #define FF_IDCT_LIBMPEG2MMX 4
1645 #define FF_IDCT_PS2 5
1646 #define FF_IDCT_MLIB 6
1647 #define FF_IDCT_ARM 7
1648 #define FF_IDCT_ALTIVEC 8
1649 #define FF_IDCT_SH4 9
1650 #define FF_IDCT_SIMPLEARM 10
1651 #define FF_IDCT_H264 11
1652 #define FF_IDCT_VP3 12
1653 #define FF_IDCT_IPP 13
1654 #define FF_IDCT_XVIDMMX 14
1655 #define FF_IDCT_CAVS 15
1656 #define FF_IDCT_SIMPLEARMV5TE 16
1657 #define FF_IDCT_SIMPLEARMV6 17
1658 #define FF_IDCT_SIMPLEVIS 18
1659 #define FF_IDCT_WMV2 19
1660 #define FF_IDCT_FAAN 20
1661 #define FF_IDCT_EA 21
1662 #define FF_IDCT_SIMPLENEON 22
1663 #define FF_IDCT_SIMPLEALPHA 23
1664 #define FF_IDCT_BINK 24
1668 * - encoding: Set by libavcodec.
1669 * - decoding: Set by user (or 0).
1673 * slice offsets in the frame in bytes
1674 * - encoding: Set/allocated by libavcodec.
1675 * - decoding: Set/allocated by user (or NULL).
1680 * error concealment flags
1681 * - encoding: unused
1682 * - decoding: Set by user.
1684 int error_concealment;
1685 #define FF_EC_GUESS_MVS 1
1686 #define FF_EC_DEBLOCK 2
1689 * dsp_mask could be add used to disable unwanted CPU features
1690 * CPU features (i.e. MMX, SSE. ...)
1692 * With the FORCE flag you may instead enable given CPU features.
1693 * (Dangerous: Usable in case of misdetection, improper usage however will
1694 * result into program crash.)
1699 #define FF_MM_FORCE AV_CPU_FLAG_FORCE
1700 #define FF_MM_MMX AV_CPU_FLAG_MMX
1701 #define FF_MM_3DNOW AV_CPU_FLAG_3DNOW
1702 #define FF_MM_MMXEXT AV_CPU_FLAG_MMX2
1703 #define FF_MM_MMX2 AV_CPU_FLAG_MMX2
1704 #define FF_MM_SSE AV_CPU_FLAG_SSE
1705 #define FF_MM_SSE2 AV_CPU_FLAG_SSE2
1706 #define FF_MM_SSE2SLOW AV_CPU_FLAG_SSE2SLOW
1707 #define FF_MM_3DNOWEXT AV_CPU_FLAG_3DNOWEXT
1708 #define FF_MM_SSE3 AV_CPU_FLAG_SSE3
1709 #define FF_MM_SSE3SLOW AV_CPU_FLAG_SSE3SLOW
1710 #define FF_MM_SSSE3 AV_CPU_FLAG_SSSE3
1711 #define FF_MM_SSE4 AV_CPU_FLAG_SSE4
1712 #define FF_MM_SSE42 AV_CPU_FLAG_SSE42
1713 #define FF_MM_IWMMXT AV_CPU_FLAG_IWMMXT
1714 #define FF_MM_ALTIVEC AV_CPU_FLAG_ALTIVEC
1718 * bits per sample/pixel from the demuxer (needed for huffyuv).
1719 * - encoding: Set by libavcodec.
1720 * - decoding: Set by user.
1722 int bits_per_coded_sample;
1725 * prediction method (needed for huffyuv)
1726 * - encoding: Set by user.
1727 * - decoding: unused
1729 int prediction_method;
1730 #define FF_PRED_LEFT 0
1731 #define FF_PRED_PLANE 1
1732 #define FF_PRED_MEDIAN 2
1735 * sample aspect ratio (0 if unknown)
1736 * That is the width of a pixel divided by the height of the pixel.
1737 * Numerator and denominator must be relatively prime and smaller than 256 for some video standards.
1738 * - encoding: Set by user.
1739 * - decoding: Set by libavcodec.
1741 AVRational sample_aspect_ratio;
1744 * the picture in the bitstream
1745 * - encoding: Set by libavcodec.
1746 * - decoding: Set by libavcodec.
1748 AVFrame *coded_frame;
1752 * - encoding: Set by user.
1753 * - decoding: Set by user.
1756 #define FF_DEBUG_PICT_INFO 1
1757 #define FF_DEBUG_RC 2
1758 #define FF_DEBUG_BITSTREAM 4
1759 #define FF_DEBUG_MB_TYPE 8
1760 #define FF_DEBUG_QP 16
1761 #define FF_DEBUG_MV 32
1762 #define FF_DEBUG_DCT_COEFF 0x00000040
1763 #define FF_DEBUG_SKIP 0x00000080
1764 #define FF_DEBUG_STARTCODE 0x00000100
1765 #define FF_DEBUG_PTS 0x00000200
1766 #define FF_DEBUG_ER 0x00000400
1767 #define FF_DEBUG_MMCO 0x00000800
1768 #define FF_DEBUG_BUGS 0x00001000
1769 #define FF_DEBUG_VIS_QP 0x00002000
1770 #define FF_DEBUG_VIS_MB_TYPE 0x00004000
1771 #define FF_DEBUG_BUFFERS 0x00008000
1775 * - encoding: Set by user.
1776 * - decoding: Set by user.
1779 #define FF_DEBUG_VIS_MV_P_FOR 0x00000001 //visualize forward predicted MVs of P frames
1780 #define FF_DEBUG_VIS_MV_B_FOR 0x00000002 //visualize forward predicted MVs of B frames
1781 #define FF_DEBUG_VIS_MV_B_BACK 0x00000004 //visualize backward predicted MVs of B frames
1785 * - encoding: Set by libavcodec if flags&CODEC_FLAG_PSNR.
1786 * - decoding: unused
1791 * minimum MB quantizer
1792 * - encoding: unused
1793 * - decoding: unused
1798 * maximum MB quantizer
1799 * - encoding: unused
1800 * - decoding: unused
1805 * motion estimation comparison function
1806 * - encoding: Set by user.
1807 * - decoding: unused
1811 * subpixel motion estimation comparison function
1812 * - encoding: Set by user.
1813 * - decoding: unused
1817 * macroblock comparison function (not supported yet)
1818 * - encoding: Set by user.
1819 * - decoding: unused
1823 * interlaced DCT comparison function
1824 * - encoding: Set by user.
1825 * - decoding: unused
1828 #define FF_CMP_SAD 0
1829 #define FF_CMP_SSE 1
1830 #define FF_CMP_SATD 2
1831 #define FF_CMP_DCT 3
1832 #define FF_CMP_PSNR 4
1833 #define FF_CMP_BIT 5
1835 #define FF_CMP_ZERO 7
1836 #define FF_CMP_VSAD 8
1837 #define FF_CMP_VSSE 9
1838 #define FF_CMP_NSSE 10
1839 #define FF_CMP_W53 11
1840 #define FF_CMP_W97 12
1841 #define FF_CMP_DCTMAX 13
1842 #define FF_CMP_DCT264 14
1843 #define FF_CMP_CHROMA 256
1846 * ME diamond size & shape
1847 * - encoding: Set by user.
1848 * - decoding: unused
1853 * amount of previous MV predictors (2a+1 x 2a+1 square)
1854 * - encoding: Set by user.
1855 * - decoding: unused
1857 int last_predictor_count;
1860 * prepass for motion estimation
1861 * - encoding: Set by user.
1862 * - decoding: unused
1867 * motion estimation prepass comparison function
1868 * - encoding: Set by user.
1869 * - decoding: unused
1874 * ME prepass diamond size & shape
1875 * - encoding: Set by user.
1876 * - decoding: unused
1882 * - encoding: Set by user.
1883 * - decoding: unused
1885 int me_subpel_quality;
1888 * callback to negotiate the pixelFormat
1889 * @param fmt is the list of formats which are supported by the codec,
1890 * it is terminated by -1 as 0 is a valid format, the formats are ordered by quality.
1891 * The first is always the native one.
1892 * @return the chosen format
1893 * - encoding: unused
1894 * - decoding: Set by user, if not set the native format will be chosen.
1896 enum PixelFormat (*get_format)(struct AVCodecContext *s, const enum PixelFormat * fmt);
1899 * DTG active format information (additional aspect ratio
1900 * information only used in DVB MPEG-2 transport streams)
1903 * - encoding: unused
1904 * - decoding: Set by decoder.
1906 int dtg_active_format;
1907 #define FF_DTG_AFD_SAME 8
1908 #define FF_DTG_AFD_4_3 9
1909 #define FF_DTG_AFD_16_9 10
1910 #define FF_DTG_AFD_14_9 11
1911 #define FF_DTG_AFD_4_3_SP_14_9 13
1912 #define FF_DTG_AFD_16_9_SP_14_9 14
1913 #define FF_DTG_AFD_SP_4_3 15
1916 * maximum motion estimation search range in subpel units
1917 * If 0 then no limit.
1919 * - encoding: Set by user.
1920 * - decoding: unused
1925 * intra quantizer bias
1926 * - encoding: Set by user.
1927 * - decoding: unused
1929 int intra_quant_bias;
1930 #define FF_DEFAULT_QUANT_BIAS 999999
1933 * inter quantizer bias
1934 * - encoding: Set by user.
1935 * - decoding: unused
1937 int inter_quant_bias;
1941 * - encoding: unused
1942 * - decoding: Which clrtable should be used for 8bit RGB images.
1943 * Tables have to be stored somewhere. FIXME
1948 * internal_buffer count
1949 * Don't touch, used by libavcodec default_get_buffer().
1951 int internal_buffer_count;
1955 * Don't touch, used by libavcodec default_get_buffer().
1957 void *internal_buffer;
1960 * Global quality for codecs which cannot change it per frame.
1961 * This should be proportional to MPEG-1/2/4 qscale.
1962 * - encoding: Set by user.
1963 * - decoding: unused
1967 #define FF_CODER_TYPE_VLC 0
1968 #define FF_CODER_TYPE_AC 1
1969 #define FF_CODER_TYPE_RAW 2
1970 #define FF_CODER_TYPE_RLE 3
1971 #define FF_CODER_TYPE_DEFLATE 4
1974 * - encoding: Set by user.
1975 * - decoding: unused
1981 * - encoding: Set by user.
1982 * - decoding: unused
1988 * - encoding: unused
1989 * - decoding: Set by user.
1991 uint8_t * (*realloc)(struct AVCodecContext *s, uint8_t *buf, int buf_size);
1996 * - encoding: unused
1997 * - decoding: Set by user.
2000 #define SLICE_FLAG_CODED_ORDER 0x0001 ///< draw_horiz_band() is called in coded order instead of display
2001 #define SLICE_FLAG_ALLOW_FIELD 0x0002 ///< allow draw_horiz_band() with field slices (MPEG2 field pics)
2002 #define SLICE_FLAG_ALLOW_PLANE 0x0004 ///< allow draw_horiz_band() with 1 component at a time (SVQ1)
2005 * XVideo Motion Acceleration
2006 * - encoding: forbidden
2007 * - decoding: set by decoder
2009 int xvmc_acceleration;
2012 * macroblock decision mode
2013 * - encoding: Set by user.
2014 * - decoding: unused
2017 #define FF_MB_DECISION_SIMPLE 0 ///< uses mb_cmp
2018 #define FF_MB_DECISION_BITS 1 ///< chooses the one which needs the fewest bits
2019 #define FF_MB_DECISION_RD 2 ///< rate distortion
2022 * custom intra quantization matrix
2023 * - encoding: Set by user, can be NULL.
2024 * - decoding: Set by libavcodec.
2026 uint16_t *intra_matrix;
2029 * custom inter quantization matrix
2030 * - encoding: Set by user, can be NULL.
2031 * - decoding: Set by libavcodec.
2033 uint16_t *inter_matrix;
2036 * fourcc from the AVI stream header (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A').
2037 * This is used to work around some encoder bugs.
2038 * - encoding: unused
2039 * - decoding: Set by user, will be converted to uppercase by libavcodec during init.
2041 unsigned int stream_codec_tag;
2044 * scene change detection threshold
2045 * 0 is default, larger means fewer detected scene changes.
2046 * - encoding: Set by user.
2047 * - decoding: unused
2049 int scenechange_threshold;
2052 * minimum Lagrange multipler
2053 * - encoding: Set by user.
2054 * - decoding: unused
2059 * maximum Lagrange multipler
2060 * - encoding: Set by user.
2061 * - decoding: unused
2065 #if FF_API_PALETTE_CONTROL
2067 * palette control structure
2068 * - encoding: ??? (no palette-enabled encoder yet)
2069 * - decoding: Set by user.
2071 struct AVPaletteControl *palctrl;
2075 * noise reduction strength
2076 * - encoding: Set by user.
2077 * - decoding: unused
2079 int noise_reduction;
2082 * Called at the beginning of a frame to get cr buffer for it.
2083 * Buffer type (size, hints) must be the same. libavcodec won't check it.
2084 * libavcodec will pass previous buffer in pic, function should return
2085 * same buffer or new buffer with old frame "painted" into it.
2086 * If pic.data[0] == NULL must behave like get_buffer().
2087 * if CODEC_CAP_DR1 is not set then reget_buffer() must call
2088 * avcodec_default_reget_buffer() instead of providing buffers allocated by
2090 * - encoding: unused
2091 * - decoding: Set by libavcodec, user can override.
2093 int (*reget_buffer)(struct AVCodecContext *c, AVFrame *pic);
2096 * Number of bits which should be loaded into the rc buffer before decoding starts.
2097 * - encoding: Set by user.
2098 * - decoding: unused
2100 int rc_initial_buffer_occupancy;
2104 * - encoding: Set by user.
2105 * - decoding: unused
2107 int inter_threshold;
2111 * - encoding: Set by user.
2112 * - decoding: Set by user.
2117 * Simulates errors in the bitstream to test error concealment.
2118 * - encoding: Set by user.
2119 * - decoding: unused
2124 * MP3 antialias algorithm, see FF_AA_* below.
2125 * - encoding: unused
2126 * - decoding: Set by user.
2129 #define FF_AA_AUTO 0
2130 #define FF_AA_FASTINT 1 //not implemented yet
2132 #define FF_AA_FLOAT 3
2134 * quantizer noise shaping
2135 * - encoding: Set by user.
2136 * - decoding: unused
2138 int quantizer_noise_shaping;
2142 * is used to decide how many independent tasks should be passed to execute()
2143 * - encoding: Set by user.
2144 * - decoding: Set by user.
2149 * The codec may call this to execute several independent things.
2150 * It will return only after finishing all tasks.
2151 * The user may replace this with some multithreaded implementation,
2152 * the default implementation will execute the parts serially.
2153 * @param count the number of things to execute
2154 * - encoding: Set by libavcodec, user can override.
2155 * - decoding: Set by libavcodec, user can override.
2157 int (*execute)(struct AVCodecContext *c, int (*func)(struct AVCodecContext *c2, void *arg), void *arg2, int *ret, int count, int size);
2161 * Can be used by execute() to store some per AVCodecContext stuff.
2162 * - encoding: set by execute()
2163 * - decoding: set by execute()
2165 void *thread_opaque;
2168 * Motion estimation threshold below which no motion estimation is
2169 * performed, but instead the user specified motion vectors are used.
2171 * - encoding: Set by user.
2172 * - decoding: unused
2177 * Macroblock threshold below which the user specified macroblock types will be used.
2178 * - encoding: Set by user.
2179 * - decoding: unused
2184 * precision of the intra DC coefficient - 8
2185 * - encoding: Set by user.
2186 * - decoding: unused
2188 int intra_dc_precision;
2191 * noise vs. sse weight for the nsse comparsion function
2192 * - encoding: Set by user.
2193 * - decoding: unused
2198 * Number of macroblock rows at the top which are skipped.
2199 * - encoding: unused
2200 * - decoding: Set by user.
2205 * Number of macroblock rows at the bottom which are skipped.
2206 * - encoding: unused
2207 * - decoding: Set by user.
2213 * - encoding: Set by user.
2214 * - decoding: Set by libavcodec.
2217 #define FF_PROFILE_UNKNOWN -99
2219 #define FF_PROFILE_AAC_MAIN 0
2220 #define FF_PROFILE_AAC_LOW 1
2221 #define FF_PROFILE_AAC_SSR 2
2222 #define FF_PROFILE_AAC_LTP 3
2224 #define FF_PROFILE_H264_BASELINE 66
2225 #define FF_PROFILE_H264_MAIN 77
2226 #define FF_PROFILE_H264_EXTENDED 88
2227 #define FF_PROFILE_H264_HIGH 100
2228 #define FF_PROFILE_H264_HIGH_10 110
2229 #define FF_PROFILE_H264_HIGH_422 122
2230 #define FF_PROFILE_H264_HIGH_444 244
2231 #define FF_PROFILE_H264_CAVLC_444 44
2235 * - encoding: Set by user.
2236 * - decoding: Set by libavcodec.
2239 #define FF_LEVEL_UNKNOWN -99
2242 * low resolution decoding, 1-> 1/2 size, 2->1/4 size
2243 * - encoding: unused
2244 * - decoding: Set by user.
2249 * Bitstream width / height, may be different from width/height if lowres
2250 * or other things are used.
2251 * - encoding: unused
2252 * - decoding: Set by user before init if known. Codec should override / dynamically change if needed.
2254 int coded_width, coded_height;
2257 * frame skip threshold
2258 * - encoding: Set by user.
2259 * - decoding: unused
2261 int frame_skip_threshold;
2265 * - encoding: Set by user.
2266 * - decoding: unused
2268 int frame_skip_factor;
2271 * frame skip exponent
2272 * - encoding: Set by user.
2273 * - decoding: unused
2278 * frame skip comparison function
2279 * - encoding: Set by user.
2280 * - decoding: unused
2285 * Border processing masking, raises the quantizer for mbs on the borders
2287 * - encoding: Set by user.
2288 * - decoding: unused
2290 float border_masking;
2293 * minimum MB lagrange multipler
2294 * - encoding: Set by user.
2295 * - decoding: unused
2300 * maximum MB lagrange multipler
2301 * - encoding: Set by user.
2302 * - decoding: unused
2308 * - encoding: Set by user.
2309 * - decoding: unused
2311 int me_penalty_compensation;
2315 * - encoding: unused
2316 * - decoding: Set by user.
2318 enum AVDiscard skip_loop_filter;
2322 * - encoding: unused
2323 * - decoding: Set by user.
2325 enum AVDiscard skip_idct;
2329 * - encoding: unused
2330 * - decoding: Set by user.
2332 enum AVDiscard skip_frame;
2336 * - encoding: Set by user.
2337 * - decoding: unused
2343 * - encoding: Set by user.
2344 * - decoding: unused
2349 * constant rate factor - quality-based VBR - values ~correspond to qps
2350 * - encoding: Set by user.
2351 * - decoding: unused
2356 * constant quantization parameter rate control method
2357 * - encoding: Set by user.
2358 * - decoding: unused
2364 * - encoding: Set by user.
2365 * - decoding: unused
2370 * number of reference frames
2371 * - encoding: Set by user.
2372 * - decoding: Set by lavc.
2377 * chroma qp offset from luma
2378 * - encoding: Set by user.
2379 * - decoding: unused
2384 * Influences how often B-frames are used.
2385 * - encoding: Set by user.
2386 * - decoding: unused
2391 * trellis RD quantization
2392 * - encoding: Set by user.
2393 * - decoding: unused
2398 * Reduce fluctuations in qp (before curve compression).
2399 * - encoding: Set by user.
2400 * - decoding: unused
2402 float complexityblur;
2405 * in-loop deblocking filter alphac0 parameter
2406 * alpha is in the range -6...6
2407 * - encoding: Set by user.
2408 * - decoding: unused
2413 * in-loop deblocking filter beta parameter
2414 * beta is in the range -6...6
2415 * - encoding: Set by user.
2416 * - decoding: unused
2421 * macroblock subpartition sizes to consider - p8x8, p4x4, b8x8, i8x8, i4x4
2422 * - encoding: Set by user.
2423 * - decoding: unused
2426 #define X264_PART_I4X4 0x001 /* Analyze i4x4 */
2427 #define X264_PART_I8X8 0x002 /* Analyze i8x8 (requires 8x8 transform) */
2428 #define X264_PART_P8X8 0x010 /* Analyze p16x8, p8x16 and p8x8 */
2429 #define X264_PART_P4X4 0x020 /* Analyze p8x4, p4x8, p4x4 */
2430 #define X264_PART_B8X8 0x100 /* Analyze b16x8, b8x16 and b8x8 */
2433 * direct MV prediction mode - 0 (none), 1 (spatial), 2 (temporal), 3 (auto)
2434 * - encoding: Set by user.
2435 * - decoding: unused
2440 * Audio cutoff bandwidth (0 means "automatic")
2441 * - encoding: Set by user.
2442 * - decoding: unused
2447 * Multiplied by qscale for each frame and added to scene_change_score.
2448 * - encoding: Set by user.
2449 * - decoding: unused
2451 int scenechange_factor;
2455 * Note: Value depends upon the compare function used for fullpel ME.
2456 * - encoding: Set by user.
2457 * - decoding: unused
2462 * Adjusts sensitivity of b_frame_strategy 1.
2463 * - encoding: Set by user.
2464 * - decoding: unused
2469 * - encoding: Set by user.
2470 * - decoding: unused
2472 int compression_level;
2473 #define FF_COMPRESSION_DEFAULT -1
2477 * Sets whether to use LPC mode - used by FLAC encoder.
2478 * - encoding: Set by user.
2479 * - decoding: unused
2480 * @deprecated Deprecated in favor of lpc_type and lpc_passes.
2486 * LPC coefficient precision - used by FLAC encoder
2487 * - encoding: Set by user.
2488 * - decoding: unused
2490 int lpc_coeff_precision;
2493 * - encoding: Set by user.
2494 * - decoding: unused
2496 int min_prediction_order;
2499 * - encoding: Set by user.
2500 * - decoding: unused
2502 int max_prediction_order;
2505 * search method for selecting prediction order
2506 * - encoding: Set by user.
2507 * - decoding: unused
2509 int prediction_order_method;
2512 * - encoding: Set by user.
2513 * - decoding: unused
2515 int min_partition_order;
2518 * - encoding: Set by user.
2519 * - decoding: unused
2521 int max_partition_order;
2524 * GOP timecode frame start number, in non drop frame format
2525 * - encoding: Set by user.
2526 * - decoding: unused
2528 int64_t timecode_frame_start;
2530 #if LIBAVCODEC_VERSION_MAJOR < 53
2532 * Decoder should decode to this many channels if it can (0 for default)
2533 * - encoding: unused
2534 * - decoding: Set by user.
2535 * @deprecated Deprecated in favor of request_channel_layout.
2537 int request_channels;
2541 * Percentage of dynamic range compression to be applied by the decoder.
2542 * The default value is 1.0, corresponding to full compression.
2543 * - encoding: unused
2544 * - decoding: Set by user.
2549 * opaque 64bit number (generally a PTS) that will be reordered and
2550 * output in AVFrame.reordered_opaque
2551 * - encoding: unused
2552 * - decoding: Set by user.
2554 int64_t reordered_opaque;
2557 * Bits per sample/pixel of internal libavcodec pixel/sample format.
2558 * This field is applicable only when sample_fmt is SAMPLE_FMT_S32.
2559 * - encoding: set by user.
2560 * - decoding: set by libavcodec.
2562 int bits_per_raw_sample;
2565 * Audio channel layout.
2566 * - encoding: set by user.
2567 * - decoding: set by libavcodec.
2569 int64_t channel_layout;
2572 * Request decoder to use this channel layout if it can (0 for default)
2573 * - encoding: unused
2574 * - decoding: Set by user.
2576 int64_t request_channel_layout;
2579 * Ratecontrol attempt to use, at maximum, <value> of what can be used without an underflow.
2580 * - encoding: Set by user.
2581 * - decoding: unused.
2583 float rc_max_available_vbv_use;
2586 * Ratecontrol attempt to use, at least, <value> times the amount needed to prevent a vbv overflow.
2587 * - encoding: Set by user.
2588 * - decoding: unused.
2590 float rc_min_vbv_overflow_use;
2593 * Hardware accelerator in use
2594 * - encoding: unused.
2595 * - decoding: Set by libavcodec
2597 struct AVHWAccel *hwaccel;
2600 * For some codecs, the time base is closer to the field rate than the frame rate.
2601 * Most notably, H.264 and MPEG-2 specify time_base as half of frame duration
2602 * if no telecine is used ...
2604 * Set to time_base ticks per frame. Default 1, e.g., H.264/MPEG-2 set it to 2.
2606 int ticks_per_frame;
2609 * Hardware accelerator context.
2610 * For some hardware accelerators, a global context needs to be
2611 * provided by the user. In that case, this holds display-dependent
2612 * data FFmpeg cannot instantiate itself. Please refer to the
2613 * FFmpeg HW accelerator documentation to know how to fill this
2614 * is. e.g. for VA API, this is a struct vaapi_context.
2615 * - encoding: unused
2616 * - decoding: Set by user
2618 void *hwaccel_context;
2621 * Chromaticity coordinates of the source primaries.
2622 * - encoding: Set by user
2623 * - decoding: Set by libavcodec
2625 enum AVColorPrimaries color_primaries;
2628 * Color Transfer Characteristic.
2629 * - encoding: Set by user
2630 * - decoding: Set by libavcodec
2632 enum AVColorTransferCharacteristic color_trc;
2635 * YUV colorspace type.
2636 * - encoding: Set by user
2637 * - decoding: Set by libavcodec
2639 enum AVColorSpace colorspace;
2642 * MPEG vs JPEG YUV range.
2643 * - encoding: Set by user
2644 * - decoding: Set by libavcodec
2646 enum AVColorRange color_range;
2649 * This defines the location of chroma samples.
2650 * - encoding: Set by user
2651 * - decoding: Set by libavcodec
2653 enum AVChromaLocation chroma_sample_location;
2656 * The codec may call this to execute several independent things.
2657 * It will return only after finishing all tasks.
2658 * The user may replace this with some multithreaded implementation,
2659 * the default implementation will execute the parts serially.
2660 * Also see avcodec_thread_init and e.g. the --enable-pthread configure option.
2661 * @param c context passed also to func
2662 * @param count the number of things to execute
2663 * @param arg2 argument passed unchanged to func
2664 * @param ret return values of executed functions, must have space for "count" values. May be NULL.
2665 * @param func function that will be called count times, with jobnr from 0 to count-1.
2666 * threadnr will be in the range 0 to c->thread_count-1 < MAX_THREADS and so that no
2667 * two instances of func executing at the same time will have the same threadnr.
2668 * @return always 0 currently, but code should handle a future improvement where when any call to func
2669 * returns < 0 no further calls to func may be done and < 0 is returned.
2670 * - encoding: Set by libavcodec, user can override.
2671 * - decoding: Set by libavcodec, user can override.
2673 int (*execute2)(struct AVCodecContext *c, int (*func)(struct AVCodecContext *c2, void *arg, int jobnr, int threadnr), void *arg2, int *ret, int count);
2676 * explicit P-frame weighted prediction analysis method
2678 * 1: fast blind weighting (one reference duplicate with -1 offset)
2679 * 2: smart weighting (full fade detection analysis)
2680 * - encoding: Set by user.
2681 * - decoding: unused
2683 int weighted_p_pred;
2688 * 1: Variance AQ (complexity mask)
2689 * 2: Auto-variance AQ (experimental)
2690 * - encoding: Set by user
2691 * - decoding: unused
2697 * Reduces blocking and blurring in flat and textured areas.
2698 * - encoding: Set by user
2699 * - decoding: unused
2705 * Strength of psychovisual optimization
2706 * - encoding: Set by user
2707 * - decoding: unused
2713 * Strength of psychovisual optimization
2714 * - encoding: Set by user
2715 * - decoding: unused
2721 * Number of frames for frametype and ratecontrol lookahead
2722 * - encoding: Set by user
2723 * - decoding: unused
2728 * Constant rate factor maximum
2729 * With CRF encoding mode and VBV restrictions enabled, prevents quality from being worse
2730 * than crf_max, even if doing so would violate VBV restrictions.
2731 * - encoding: Set by user.
2732 * - decoding: unused
2736 int log_level_offset;
2739 * Determines which LPC analysis algorithm to use.
2740 * - encoding: Set by user
2741 * - decoding: unused
2743 enum AVLPCType lpc_type;
2746 * Number of passes to use for Cholesky factorization during LPC analysis
2747 * - encoding: Set by user
2748 * - decoding: unused
2754 * Indicates number of picture subdivisions. Used for parallelized
2756 * - encoding: Set by user
2757 * - decoding: unused
2765 typedef struct AVCodec {
2767 * Name of the codec implementation.
2768 * The name is globally unique among encoders and among decoders (but an
2769 * encoder and a decoder can share the same name).
2770 * This is the primary way to find a codec from the user perspective.
2773 enum AVMediaType type;
2776 int (*init)(AVCodecContext *);
2777 int (*encode)(AVCodecContext *, uint8_t *buf, int buf_size, void *data);
2778 int (*close)(AVCodecContext *);
2779 int (*decode)(AVCodecContext *, void *outdata, int *outdata_size, AVPacket *avpkt);
2781 * Codec capabilities.
2785 struct AVCodec *next;
2788 * Will be called when seeking
2790 void (*flush)(AVCodecContext *);
2791 const AVRational *supported_framerates; ///< array of supported framerates, or NULL if any, array is terminated by {0,0}
2792 const enum PixelFormat *pix_fmts; ///< array of supported pixel formats, or NULL if unknown, array is terminated by -1
2794 * Descriptive name for the codec, meant to be more human readable than name.
2795 * You should use the NULL_IF_CONFIG_SMALL() macro to define it.
2797 const char *long_name;
2798 const int *supported_samplerates; ///< array of supported audio samplerates, or NULL if unknown, array is terminated by 0
2799 const enum SampleFormat *sample_fmts; ///< array of supported sample formats, or NULL if unknown, array is terminated by -1
2800 const int64_t *channel_layouts; ///< array of support channel layouts, or NULL if unknown. array is terminated by 0
2801 uint8_t max_lowres; ///< maximum value for lowres supported by the decoder
2802 AVClass *priv_class; ///< AVClass for the private context
2808 typedef struct AVHWAccel {
2810 * Name of the hardware accelerated codec.
2811 * The name is globally unique among encoders and among decoders (but an
2812 * encoder and a decoder can share the same name).
2817 * Type of codec implemented by the hardware accelerator.
2819 * See AVMEDIA_TYPE_xxx
2821 enum AVMediaType type;
2824 * Codec implemented by the hardware accelerator.
2831 * Supported pixel format.
2833 * Only hardware accelerated formats are supported here.
2835 enum PixelFormat pix_fmt;
2838 * Hardware accelerated codec capabilities.
2839 * see FF_HWACCEL_CODEC_CAP_*
2843 struct AVHWAccel *next;
2846 * Called at the beginning of each frame or field picture.
2848 * Meaningful frame information (codec specific) is guaranteed to
2849 * be parsed at this point. This function is mandatory.
2851 * Note that buf can be NULL along with buf_size set to 0.
2852 * Otherwise, this means the whole frame is available at this point.
2854 * @param avctx the codec context
2855 * @param buf the frame data buffer base
2856 * @param buf_size the size of the frame in bytes
2857 * @return zero if successful, a negative value otherwise
2859 int (*start_frame)(AVCodecContext *avctx, const uint8_t *buf, uint32_t buf_size);
2862 * Callback for each slice.
2864 * Meaningful slice information (codec specific) is guaranteed to
2865 * be parsed at this point. This function is mandatory.
2867 * @param avctx the codec context
2868 * @param buf the slice data buffer base
2869 * @param buf_size the size of the slice in bytes
2870 * @return zero if successful, a negative value otherwise
2872 int (*decode_slice)(AVCodecContext *avctx, const uint8_t *buf, uint32_t buf_size);
2875 * Called at the end of each frame or field picture.
2877 * The whole picture is parsed at this point and can now be sent
2878 * to the hardware accelerator. This function is mandatory.
2880 * @param avctx the codec context
2881 * @return zero if successful, a negative value otherwise
2883 int (*end_frame)(AVCodecContext *avctx);
2886 * Size of HW accelerator private data.
2888 * Private data is allocated with av_mallocz() before
2889 * AVCodecContext.get_buffer() and deallocated after
2890 * AVCodecContext.release_buffer().
2896 * four components are given, that's all.
2897 * the last component is alpha
2899 typedef struct AVPicture {
2901 int linesize[4]; ///< number of bytes per line
2904 #if FF_API_PALETTE_CONTROL
2907 * This structure defines a method for communicating palette changes
2908 * between and demuxer and a decoder.
2910 * @deprecated Use AVPacket to send palette changes instead.
2911 * This is totally broken.
2913 #define AVPALETTE_SIZE 1024
2914 #define AVPALETTE_COUNT 256
2915 typedef struct AVPaletteControl {
2917 /* Demuxer sets this to 1 to indicate the palette has changed;
2918 * decoder resets to 0. */
2919 int palette_changed;
2921 /* 4-byte ARGB palette entries, stored in native byte order; note that
2922 * the individual palette components should be on a 8-bit scale; if
2923 * the palette data comes from an IBM VGA native format, the component
2924 * data is probably 6 bits in size and needs to be scaled. */
2925 unsigned int palette[AVPALETTE_COUNT];
2927 } AVPaletteControl attribute_deprecated;
2930 enum AVSubtitleType {
2933 SUBTITLE_BITMAP, ///< A bitmap, pict will be set
2936 * Plain text, the text field must be set by the decoder and is
2937 * authoritative. ass and pict fields may contain approximations.
2942 * Formatted text, the ass field must be set by the decoder and is
2943 * authoritative. pict and text fields may contain approximations.
2948 typedef struct AVSubtitleRect {
2949 int x; ///< top left corner of pict, undefined when pict is not set
2950 int y; ///< top left corner of pict, undefined when pict is not set
2951 int w; ///< width of pict, undefined when pict is not set
2952 int h; ///< height of pict, undefined when pict is not set
2953 int nb_colors; ///< number of colors in pict, undefined when pict is not set
2956 * data+linesize for the bitmap of this subtitle.
2957 * can be set for text/ass as well once they where rendered
2960 enum AVSubtitleType type;
2962 char *text; ///< 0 terminated plain UTF-8 text
2965 * 0 terminated ASS/SSA compatible event line.
2966 * The pressentation of this is unaffected by the other values in this
2972 typedef struct AVSubtitle {
2973 uint16_t format; /* 0 = graphics */
2974 uint32_t start_display_time; /* relative to packet pts, in ms */
2975 uint32_t end_display_time; /* relative to packet pts, in ms */
2977 AVSubtitleRect **rects;
2978 int64_t pts; ///< Same as packet pts, in AV_TIME_BASE
2981 /* packet functions */
2984 * @deprecated use NULL instead
2986 attribute_deprecated void av_destruct_packet_nofree(AVPacket *pkt);
2989 * Default packet destructor.
2991 void av_destruct_packet(AVPacket *pkt);
2994 * Initialize optional fields of a packet with default values.
2998 void av_init_packet(AVPacket *pkt);
3001 * Allocate the payload of a packet and initialize its fields with
3005 * @param size wanted payload size
3006 * @return 0 if OK, AVERROR_xxx otherwise
3008 int av_new_packet(AVPacket *pkt, int size);
3011 * Reduce packet size, correctly zeroing padding
3014 * @param size new size
3016 void av_shrink_packet(AVPacket *pkt, int size);
3019 * @warning This is a hack - the packet memory allocation stuff is broken. The
3020 * packet is allocated if it was not really allocated.
3022 int av_dup_packet(AVPacket *pkt);
3027 * @param pkt packet to free
3029 void av_free_packet(AVPacket *pkt);
3033 struct ReSampleContext;
3034 struct AVResampleContext;
3036 typedef struct ReSampleContext ReSampleContext;
3038 #if FF_API_AUDIO_OLD
3040 * @deprecated Use av_audio_resample_init() instead.
3042 attribute_deprecated ReSampleContext *audio_resample_init(int output_channels, int input_channels,
3043 int output_rate, int input_rate);
3046 * Initialize audio resampling context
3048 * @param output_channels number of output channels
3049 * @param input_channels number of input channels
3050 * @param output_rate output sample rate
3051 * @param input_rate input sample rate
3052 * @param sample_fmt_out requested output sample format
3053 * @param sample_fmt_in input sample format
3054 * @param filter_length length of each FIR filter in the filterbank relative to the cutoff freq
3055 * @param log2_phase_count log2 of the number of entries in the polyphase filterbank
3056 * @param linear If 1 then the used FIR filter will be linearly interpolated
3057 between the 2 closest, if 0 the closest will be used
3058 * @param cutoff cutoff frequency, 1.0 corresponds to half the output sampling rate
3059 * @return allocated ReSampleContext, NULL if error occured
3061 ReSampleContext *av_audio_resample_init(int output_channels, int input_channels,
3062 int output_rate, int input_rate,
3063 enum SampleFormat sample_fmt_out,
3064 enum SampleFormat sample_fmt_in,
3065 int filter_length, int log2_phase_count,
3066 int linear, double cutoff);
3068 int audio_resample(ReSampleContext *s, short *output, short *input, int nb_samples);
3069 void audio_resample_close(ReSampleContext *s);
3073 * Initialize an audio resampler.
3074 * Note, if either rate is not an integer then simply scale both rates up so they are.
3075 * @param filter_length length of each FIR filter in the filterbank relative to the cutoff freq
3076 * @param log2_phase_count log2 of the number of entries in the polyphase filterbank
3077 * @param linear If 1 then the used FIR filter will be linearly interpolated
3078 between the 2 closest, if 0 the closest will be used
3079 * @param cutoff cutoff frequency, 1.0 corresponds to half the output sampling rate
3081 struct AVResampleContext *av_resample_init(int out_rate, int in_rate, int filter_length, int log2_phase_count, int linear, double cutoff);
3084 * Resample an array of samples using a previously configured context.
3085 * @param src an array of unconsumed samples
3086 * @param consumed the number of samples of src which have been consumed are returned here
3087 * @param src_size the number of unconsumed samples available
3088 * @param dst_size the amount of space in samples available in dst
3089 * @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.
3090 * @return the number of samples written in dst or -1 if an error occurred
3092 int av_resample(struct AVResampleContext *c, short *dst, short *src, int *consumed, int src_size, int dst_size, int update_ctx);
3096 * Compensate samplerate/timestamp drift. The compensation is done by changing
3097 * the resampler parameters, so no audible clicks or similar distortions occur
3098 * @param compensation_distance distance in output samples over which the compensation should be performed
3099 * @param sample_delta number of output samples which should be output less
3101 * example: av_resample_compensate(c, 10, 500)
3102 * here instead of 510 samples only 500 samples would be output
3104 * note, due to rounding the actual compensation might be slightly different,
3105 * especially if the compensation_distance is large and the in_rate used during init is small
3107 void av_resample_compensate(struct AVResampleContext *c, int sample_delta, int compensation_distance);
3108 void av_resample_close(struct AVResampleContext *c);
3111 * Allocate memory for a picture. Call avpicture_free to free it.
3113 * @param picture the picture to be filled in
3114 * @param pix_fmt the format of the picture
3115 * @param width the width of the picture
3116 * @param height the height of the picture
3117 * @return zero if successful, a negative value if not
3119 int avpicture_alloc(AVPicture *picture, enum PixelFormat pix_fmt, int width, int height);
3122 * Free a picture previously allocated by avpicture_alloc().
3124 * @param picture the AVPicture to be freed
3126 void avpicture_free(AVPicture *picture);
3129 * Fill in the AVPicture fields.
3130 * The fields of the given AVPicture are filled in by using the 'ptr' address
3131 * which points to the image data buffer. Depending on the specified picture
3132 * format, one or multiple image data pointers and line sizes will be set.
3133 * If a planar format is specified, several pointers will be set pointing to
3134 * the different picture planes and the line sizes of the different planes
3135 * will be stored in the lines_sizes array.
3136 * Call with ptr == NULL to get the required size for the ptr buffer.
3138 * @param picture AVPicture whose fields are to be filled in
3139 * @param ptr Buffer which will contain or contains the actual image data
3140 * @param pix_fmt The format in which the picture data is stored.
3141 * @param width the width of the image in pixels
3142 * @param height the height of the image in pixels
3143 * @return size of the image data in bytes
3145 int avpicture_fill(AVPicture *picture, uint8_t *ptr,
3146 enum PixelFormat pix_fmt, int width, int height);
3147 int avpicture_layout(const AVPicture* src, enum PixelFormat pix_fmt, int width, int height,
3148 unsigned char *dest, int dest_size);
3151 * Calculate the size in bytes that a picture of the given width and height
3152 * would occupy if stored in the given picture format.
3153 * Note that this returns the size of a compact representation as generated
3154 * by avpicture_layout, which can be smaller than the size required for e.g.
3157 * @param pix_fmt the given picture format
3158 * @param width the width of the image
3159 * @param height the height of the image
3160 * @return Image data size in bytes or -1 on error (e.g. too large dimensions).
3162 int avpicture_get_size(enum PixelFormat pix_fmt, int width, int height);
3163 void avcodec_get_chroma_sub_sample(enum PixelFormat pix_fmt, int *h_shift, int *v_shift);
3164 const char *avcodec_get_pix_fmt_name(enum PixelFormat pix_fmt);
3165 void avcodec_set_dimensions(AVCodecContext *s, int width, int height);
3167 #if LIBAVCODEC_VERSION_MAJOR < 53
3169 * Return the pixel format corresponding to the name name.
3171 * If there is no pixel format with name name, then look for a
3172 * pixel format with the name corresponding to the native endian
3174 * For example in a little-endian system, first look for "gray16",
3175 * then for "gray16le".
3177 * Finally if no pixel format has been found, return PIX_FMT_NONE.
3179 * @deprecated Deprecated in favor of av_get_pix_fmt().
3181 attribute_deprecated enum PixelFormat avcodec_get_pix_fmt(const char* name);
3185 * Return a value representing the fourCC code associated to the
3186 * pixel format pix_fmt, or 0 if no associated fourCC code can be
3189 unsigned int avcodec_pix_fmt_to_codec_tag(enum PixelFormat pix_fmt);
3192 * Put a string representing the codec tag codec_tag in buf.
3194 * @param buf_size size in bytes of buf
3195 * @return the length of the string that would have been generated if
3196 * enough space had been available, excluding the trailing null
3198 size_t av_get_codec_tag_string(char *buf, size_t buf_size, unsigned int codec_tag);
3200 #define FF_LOSS_RESOLUTION 0x0001 /**< loss due to resolution change */
3201 #define FF_LOSS_DEPTH 0x0002 /**< loss due to color depth change */
3202 #define FF_LOSS_COLORSPACE 0x0004 /**< loss due to color space conversion */
3203 #define FF_LOSS_ALPHA 0x0008 /**< loss of alpha bits */
3204 #define FF_LOSS_COLORQUANT 0x0010 /**< loss due to color quantization */
3205 #define FF_LOSS_CHROMA 0x0020 /**< loss of chroma (e.g. RGB to gray conversion) */
3208 * Compute what kind of losses will occur when converting from one specific
3209 * pixel format to another.
3210 * When converting from one pixel format to another, information loss may occur.
3211 * For example, when converting from RGB24 to GRAY, the color information will
3212 * be lost. Similarly, other losses occur when converting from some formats to
3213 * other formats. These losses can involve loss of chroma, but also loss of
3214 * resolution, loss of color depth, loss due to the color space conversion, loss
3215 * of the alpha bits or loss due to color quantization.
3216 * avcodec_get_fix_fmt_loss() informs you about the various types of losses
3217 * which will occur when converting from one pixel format to another.
3219 * @param[in] dst_pix_fmt destination pixel format
3220 * @param[in] src_pix_fmt source pixel format
3221 * @param[in] has_alpha Whether the source pixel format alpha channel is used.
3222 * @return Combination of flags informing you what kind of losses will occur.
3224 int avcodec_get_pix_fmt_loss(enum PixelFormat dst_pix_fmt, enum PixelFormat src_pix_fmt,
3228 * Find the best pixel format to convert to given a certain source pixel
3229 * format. When converting from one pixel format to another, information loss
3230 * may occur. For example, when converting from RGB24 to GRAY, the color
3231 * information will be lost. Similarly, other losses occur when converting from
3232 * some formats to other formats. avcodec_find_best_pix_fmt() searches which of
3233 * the given pixel formats should be used to suffer the least amount of loss.
3234 * The pixel formats from which it chooses one, are determined by the
3235 * pix_fmt_mask parameter.
3238 * src_pix_fmt = PIX_FMT_YUV420P;
3239 * pix_fmt_mask = (1 << PIX_FMT_YUV422P) || (1 << PIX_FMT_RGB24);
3240 * dst_pix_fmt = avcodec_find_best_pix_fmt(pix_fmt_mask, src_pix_fmt, alpha, &loss);
3243 * @param[in] pix_fmt_mask bitmask determining which pixel format to choose from
3244 * @param[in] src_pix_fmt source pixel format
3245 * @param[in] has_alpha Whether the source pixel format alpha channel is used.
3246 * @param[out] loss_ptr Combination of flags informing you what kind of losses will occur.
3247 * @return The best pixel format to convert to or -1 if none was found.
3249 enum PixelFormat avcodec_find_best_pix_fmt(int64_t pix_fmt_mask, enum PixelFormat src_pix_fmt,
3250 int has_alpha, int *loss_ptr);
3254 * Print in buf the string corresponding to the pixel format with
3255 * number pix_fmt, or an header if pix_fmt is negative.
3257 * @param[in] buf the buffer where to write the string
3258 * @param[in] buf_size the size of buf
3259 * @param[in] pix_fmt the number of the pixel format to print the corresponding info string, or
3260 * a negative value to print the corresponding header.
3261 * Meaningful values for obtaining a pixel format info vary from 0 to PIX_FMT_NB -1.
3263 void avcodec_pix_fmt_string (char *buf, int buf_size, enum PixelFormat pix_fmt);
3265 #define FF_ALPHA_TRANSP 0x0001 /* image has some totally transparent pixels */
3266 #define FF_ALPHA_SEMI_TRANSP 0x0002 /* image has some transparent pixels */
3269 * Tell if an image really has transparent alpha values.
3270 * @return ored mask of FF_ALPHA_xxx constants
3272 int img_get_alpha_info(const AVPicture *src,
3273 enum PixelFormat pix_fmt, int width, int height);
3275 /* deinterlace a picture */
3276 /* deinterlace - if not supported return -1 */
3277 int avpicture_deinterlace(AVPicture *dst, const AVPicture *src,
3278 enum PixelFormat pix_fmt, int width, int height);
3280 /* external high level API */
3283 * If c is NULL, returns the first registered codec,
3284 * if c is non-NULL, returns the next registered codec after c,
3285 * or NULL if c is the last one.
3287 AVCodec *av_codec_next(AVCodec *c);
3290 * Return the LIBAVCODEC_VERSION_INT constant.
3292 unsigned avcodec_version(void);
3295 * Return the libavcodec build-time configuration.
3297 const char *avcodec_configuration(void);
3300 * Return the libavcodec license.
3302 const char *avcodec_license(void);
3305 * Initialize libavcodec.
3307 * @warning This function must be called before any other libavcodec
3310 void avcodec_init(void);
3312 #if LIBAVCODEC_VERSION_MAJOR < 53
3314 * @deprecated Deprecated in favor of avcodec_register().
3316 attribute_deprecated void register_avcodec(AVCodec *codec);
3320 * Register the codec codec and initialize libavcodec.
3322 * @see avcodec_init()
3324 void avcodec_register(AVCodec *codec);
3327 * Find a registered encoder with a matching codec ID.
3329 * @param id CodecID of the requested encoder
3330 * @return An encoder if one was found, NULL otherwise.
3332 AVCodec *avcodec_find_encoder(enum CodecID id);
3335 * Find a registered encoder with the specified name.
3337 * @param name name of the requested encoder
3338 * @return An encoder if one was found, NULL otherwise.
3340 AVCodec *avcodec_find_encoder_by_name(const char *name);
3343 * Find a registered decoder with a matching codec ID.
3345 * @param id CodecID of the requested decoder
3346 * @return A decoder if one was found, NULL otherwise.
3348 AVCodec *avcodec_find_decoder(enum CodecID id);
3351 * Find a registered decoder with the specified name.
3353 * @param name name of the requested decoder
3354 * @return A decoder if one was found, NULL otherwise.
3356 AVCodec *avcodec_find_decoder_by_name(const char *name);
3357 void avcodec_string(char *buf, int buf_size, AVCodecContext *enc, int encode);
3360 * Set the fields of the given AVCodecContext to default values.
3362 * @param s The AVCodecContext of which the fields should be set to default values.
3364 void avcodec_get_context_defaults(AVCodecContext *s);
3366 /** THIS FUNCTION IS NOT YET PART OF THE PUBLIC API!
3367 * we WILL change its arguments and name a few times! */
3368 void avcodec_get_context_defaults2(AVCodecContext *s, enum AVMediaType);
3370 /** THIS FUNCTION IS NOT YET PART OF THE PUBLIC API!
3371 * we WILL change its arguments and name a few times! */
3372 int avcodec_get_context_defaults3(AVCodecContext *s, AVCodec *codec);
3375 * Allocate an AVCodecContext and set its fields to default values. The
3376 * resulting struct can be deallocated by simply calling av_free().
3378 * @return An AVCodecContext filled with default values or NULL on failure.
3379 * @see avcodec_get_context_defaults
3381 AVCodecContext *avcodec_alloc_context(void);
3383 /** THIS FUNCTION IS NOT YET PART OF THE PUBLIC API!
3384 * we WILL change its arguments and name a few times! */
3385 AVCodecContext *avcodec_alloc_context2(enum AVMediaType);
3387 /** THIS FUNCTION IS NOT YET PART OF THE PUBLIC API!
3388 * we WILL change its arguments and name a few times! */
3389 AVCodecContext *avcodec_alloc_context3(AVCodec *codec);
3392 * Copy the settings of the source AVCodecContext into the destination
3393 * AVCodecContext. The resulting destination codec context will be
3394 * unopened, i.e. you are required to call avcodec_open() before you
3395 * can use this AVCodecContext to decode/encode video/audio data.
3397 * @param dest target codec context, should be initialized with
3398 * avcodec_alloc_context(), but otherwise uninitialized
3399 * @param src source codec context
3400 * @return AVERROR() on error (e.g. memory allocation error), 0 on success
3402 int avcodec_copy_context(AVCodecContext *dest, const AVCodecContext *src);
3405 * Set the fields of the given AVFrame to default values.
3407 * @param pic The AVFrame of which the fields should be set to default values.
3409 void avcodec_get_frame_defaults(AVFrame *pic);
3412 * Allocate an AVFrame and set its fields to default values. The resulting
3413 * struct can be deallocated by simply calling av_free().
3415 * @return An AVFrame filled with default values or NULL on failure.
3416 * @see avcodec_get_frame_defaults
3418 AVFrame *avcodec_alloc_frame(void);
3420 int avcodec_default_get_buffer(AVCodecContext *s, AVFrame *pic);
3421 void avcodec_default_release_buffer(AVCodecContext *s, AVFrame *pic);
3422 int avcodec_default_reget_buffer(AVCodecContext *s, AVFrame *pic);
3425 * Return the amount of padding in pixels which the get_buffer callback must
3426 * provide around the edge of the image for codecs which do not have the
3427 * CODEC_FLAG_EMU_EDGE flag.
3429 * @return Required padding in pixels.
3431 unsigned avcodec_get_edge_width(void);
3433 * Modify width and height values so that they will result in a memory
3434 * buffer that is acceptable for the codec if you do not use any horizontal
3437 * May only be used if a codec with CODEC_CAP_DR1 has been opened.
3438 * If CODEC_FLAG_EMU_EDGE is not set, the dimensions must have been increased
3439 * according to avcodec_get_edge_width() before.
3441 void avcodec_align_dimensions(AVCodecContext *s, int *width, int *height);
3443 * Modify width and height values so that they will result in a memory
3444 * buffer that is acceptable for the codec if you also ensure that all
3445 * line sizes are a multiple of the respective linesize_align[i].
3447 * May only be used if a codec with CODEC_CAP_DR1 has been opened.
3448 * If CODEC_FLAG_EMU_EDGE is not set, the dimensions must have been increased
3449 * according to avcodec_get_edge_width() before.
3451 void avcodec_align_dimensions2(AVCodecContext *s, int *width, int *height,
3452 int linesize_align[4]);
3454 #if LIBAVCODEC_VERSION_MAJOR < 53
3456 * @deprecated Deprecated in favor of av_check_image_size().
3458 attribute_deprecated
3459 int avcodec_check_dimensions(void *av_log_ctx, unsigned int w, unsigned int h);
3462 enum PixelFormat avcodec_default_get_format(struct AVCodecContext *s, const enum PixelFormat * fmt);
3464 int avcodec_thread_init(AVCodecContext *s, int thread_count);
3465 void avcodec_thread_free(AVCodecContext *s);
3466 int avcodec_default_execute(AVCodecContext *c, int (*func)(AVCodecContext *c2, void *arg2),void *arg, int *ret, int count, int size);
3467 int avcodec_default_execute2(AVCodecContext *c, int (*func)(AVCodecContext *c2, void *arg2, int, int),void *arg, int *ret, int count);
3468 //FIXME func typedef
3471 * Initialize the AVCodecContext to use the given AVCodec. Prior to using this
3472 * function the context has to be allocated.
3474 * The functions avcodec_find_decoder_by_name(), avcodec_find_encoder_by_name(),
3475 * avcodec_find_decoder() and avcodec_find_encoder() provide an easy way for
3476 * retrieving a codec.
3478 * @warning This function is not thread safe!
3481 * avcodec_register_all();
3482 * codec = avcodec_find_decoder(CODEC_ID_H264);
3486 * context = avcodec_alloc_context();
3488 * if (avcodec_open(context, codec) < 0)
3492 * @param avctx The context which will be set up to use the given codec.
3493 * @param codec The codec to use within the context.
3494 * @return zero on success, a negative value on error
3495 * @see avcodec_alloc_context, avcodec_find_decoder, avcodec_find_encoder
3497 int avcodec_open(AVCodecContext *avctx, AVCodec *codec);
3499 #if FF_API_AUDIO_OLD
3501 * Decode an audio frame from buf into samples.
3502 * Wrapper function which calls avcodec_decode_audio3.
3504 * @deprecated Use avcodec_decode_audio3 instead.
3505 * @param avctx the codec context
3506 * @param[out] samples the output buffer
3507 * @param[in,out] frame_size_ptr the output buffer size in bytes
3508 * @param[in] buf the input buffer
3509 * @param[in] buf_size the input buffer size in bytes
3510 * @return On error a negative value is returned, otherwise the number of bytes
3511 * used or zero if no frame could be decompressed.
3513 attribute_deprecated int avcodec_decode_audio2(AVCodecContext *avctx, int16_t *samples,
3514 int *frame_size_ptr,
3515 const uint8_t *buf, int buf_size);
3519 * Decode the audio frame of size avpkt->size from avpkt->data into samples.
3520 * Some decoders may support multiple frames in a single AVPacket, such
3521 * decoders would then just decode the first frame. In this case,
3522 * avcodec_decode_audio3 has to be called again with an AVPacket that contains
3523 * the remaining data in order to decode the second frame etc.
3525 * could be outputted, frame_size_ptr is zero. Otherwise, it is the
3526 * decompressed frame size in bytes.
3528 * @warning You must set frame_size_ptr to the allocated size of the
3529 * output buffer before calling avcodec_decode_audio3().
3531 * @warning The input buffer must be FF_INPUT_BUFFER_PADDING_SIZE larger than
3532 * the actual read bytes because some optimized bitstream readers read 32 or 64
3533 * bits at once and could read over the end.
3535 * @warning The end of the input buffer avpkt->data should be set to 0 to ensure that
3536 * no overreading happens for damaged MPEG streams.
3538 * @note You might have to align the input buffer avpkt->data and output buffer
3539 * samples. The alignment requirements depend on the CPU: On some CPUs it isn't
3540 * necessary at all, on others it won't work at all if not aligned and on others
3541 * it will work but it will have an impact on performance.
3543 * In practice, avpkt->data should have 4 byte alignment at minimum and
3544 * samples should be 16 byte aligned unless the CPU doesn't need it
3545 * (AltiVec and SSE do).
3547 * @param avctx the codec context
3548 * @param[out] samples the output buffer, sample type in avctx->sample_fmt
3549 * @param[in,out] frame_size_ptr the output buffer size in bytes
3550 * @param[in] avpkt The input AVPacket containing the input buffer.
3551 * You can create such packet with av_init_packet() and by then setting
3552 * data and size, some decoders might in addition need other fields.
3553 * All decoders are designed to use the least fields possible though.
3554 * @return On error a negative value is returned, otherwise the number of bytes
3555 * used or zero if no frame data was decompressed (used) from the input AVPacket.
3557 int avcodec_decode_audio3(AVCodecContext *avctx, int16_t *samples,
3558 int *frame_size_ptr,
3561 #if FF_API_VIDEO_OLD
3563 * Decode a video frame from buf into picture.
3564 * Wrapper function which calls avcodec_decode_video2.
3566 * @deprecated Use avcodec_decode_video2 instead.
3567 * @param avctx the codec context
3568 * @param[out] picture The AVFrame in which the decoded video frame will be stored.
3569 * @param[in] buf the input buffer
3570 * @param[in] buf_size the size of the input buffer in bytes
3571 * @param[in,out] got_picture_ptr Zero if no frame could be decompressed, otherwise, it is nonzero.
3572 * @return On error a negative value is returned, otherwise the number of bytes
3573 * used or zero if no frame could be decompressed.
3575 attribute_deprecated int avcodec_decode_video(AVCodecContext *avctx, AVFrame *picture,
3576 int *got_picture_ptr,
3577 const uint8_t *buf, int buf_size);
3581 * Decode the video frame of size avpkt->size from avpkt->data into picture.
3582 * Some decoders may support multiple frames in a single AVPacket, such
3583 * decoders would then just decode the first frame.
3585 * @warning The input buffer must be FF_INPUT_BUFFER_PADDING_SIZE larger than
3586 * the actual read bytes because some optimized bitstream readers read 32 or 64
3587 * bits at once and could read over the end.
3589 * @warning The end of the input buffer buf should be set to 0 to ensure that
3590 * no overreading happens for damaged MPEG streams.
3592 * @note You might have to align the input buffer avpkt->data.
3593 * The alignment requirements depend on the CPU: on some CPUs it isn't
3594 * necessary at all, on others it won't work at all if not aligned and on others
3595 * it will work but it will have an impact on performance.
3597 * In practice, avpkt->data should have 4 byte alignment at minimum.
3599 * @note Some codecs have a delay between input and output, these need to be
3600 * fed with avpkt->data=NULL, avpkt->size=0 at the end to return the remaining frames.
3602 * @param avctx the codec context
3603 * @param[out] picture The AVFrame in which the decoded video frame will be stored.
3604 * Use avcodec_alloc_frame to get an AVFrame, the codec will
3605 * allocate memory for the actual bitmap.
3606 * with default get/release_buffer(), the decoder frees/reuses the bitmap as it sees fit.
3607 * with overridden get/release_buffer() (needs CODEC_CAP_DR1) the user decides into what buffer the decoder
3608 * decodes and the decoder tells the user once it does not need the data anymore,
3609 * the user app can at this point free/reuse/keep the memory as it sees fit.
3611 * @param[in] avpkt The input AVpacket containing the input buffer.
3612 * You can create such packet with av_init_packet() and by then setting
3613 * data and size, some decoders might in addition need other fields like
3614 * flags&AV_PKT_FLAG_KEY. All decoders are designed to use the least
3616 * @param[in,out] got_picture_ptr Zero if no frame could be decompressed, otherwise, it is nonzero.
3617 * @return On error a negative value is returned, otherwise the number of bytes
3618 * used or zero if no frame could be decompressed.
3620 int avcodec_decode_video2(AVCodecContext *avctx, AVFrame *picture,
3621 int *got_picture_ptr,
3624 #if FF_API_SUBTITLE_OLD
3625 /* Decode a subtitle message. Return -1 if error, otherwise return the
3626 * number of bytes used. If no subtitle could be decompressed,
3627 * got_sub_ptr is zero. Otherwise, the subtitle is stored in *sub. */
3628 attribute_deprecated int avcodec_decode_subtitle(AVCodecContext *avctx, AVSubtitle *sub,
3630 const uint8_t *buf, int buf_size);
3634 * Decode a subtitle message.
3635 * Return a negative value on error, otherwise return the number of bytes used.
3636 * If no subtitle could be decompressed, got_sub_ptr is zero.
3637 * Otherwise, the subtitle is stored in *sub.
3638 * Note that CODEC_CAP_DR1 is not available for subtitle codecs. This is for
3639 * simplicity, because the performance difference is expect to be negligible
3640 * and reusing a get_buffer written for video codecs would probably perform badly
3641 * due to a potentially very different allocation pattern.
3643 * @param avctx the codec context
3644 * @param[out] sub The AVSubtitle in which the decoded subtitle will be stored, must be
3645 freed with avsubtitle_free if *got_sub_ptr is set.
3646 * @param[in,out] got_sub_ptr Zero if no subtitle could be decompressed, otherwise, it is nonzero.
3647 * @param[in] avpkt The input AVPacket containing the input buffer.
3649 int avcodec_decode_subtitle2(AVCodecContext *avctx, AVSubtitle *sub,
3654 * Frees all allocated data in the given subtitle struct.
3656 * @param sub AVSubtitle to free.
3658 void avsubtitle_free(AVSubtitle *sub);
3660 int avcodec_parse_frame(AVCodecContext *avctx, uint8_t **pdata,
3662 uint8_t *buf, int buf_size);
3665 * Encode an audio frame from samples into buf.
3667 * @note The output buffer should be at least FF_MIN_BUFFER_SIZE bytes large.
3668 * However, for PCM audio the user will know how much space is needed
3669 * because it depends on the value passed in buf_size as described
3670 * below. In that case a lower value can be used.
3672 * @param avctx the codec context
3673 * @param[out] buf the output buffer
3674 * @param[in] buf_size the output buffer size
3675 * @param[in] samples the input buffer containing the samples
3676 * The number of samples read from this buffer is frame_size*channels,
3677 * both of which are defined in avctx.
3678 * For PCM audio the number of samples read from samples is equal to
3679 * buf_size * input_sample_size / output_sample_size.
3680 * @return On error a negative value is returned, on success zero or the number
3681 * of bytes used to encode the data read from the input buffer.
3683 int avcodec_encode_audio(AVCodecContext *avctx, uint8_t *buf, int buf_size,
3684 const short *samples);
3687 * Encode a video frame from pict into buf.
3688 * The input picture should be
3689 * stored using a specific format, namely avctx.pix_fmt.
3691 * @param avctx the codec context
3692 * @param[out] buf the output buffer for the bitstream of encoded frame
3693 * @param[in] buf_size the size of the output buffer in bytes
3694 * @param[in] pict the input picture to encode
3695 * @return On error a negative value is returned, on success zero or the number
3696 * of bytes used from the output buffer.
3698 int avcodec_encode_video(AVCodecContext *avctx, uint8_t *buf, int buf_size,
3699 const AVFrame *pict);
3700 int avcodec_encode_subtitle(AVCodecContext *avctx, uint8_t *buf, int buf_size,
3701 const AVSubtitle *sub);
3703 int avcodec_close(AVCodecContext *avctx);
3706 * Register all the codecs, parsers and bitstream filters which were enabled at
3707 * configuration time. If you do not call this function you can select exactly
3708 * which formats you want to support, by using the individual registration
3711 * @see avcodec_register
3712 * @see av_register_codec_parser
3713 * @see av_register_bitstream_filter
3715 void avcodec_register_all(void);
3718 * Flush buffers, should be called when seeking or when switching to a different stream.
3720 void avcodec_flush_buffers(AVCodecContext *avctx);
3722 void avcodec_default_free_buffers(AVCodecContext *s);
3724 /* misc useful functions */
3727 * Return a single letter to describe the given picture type pict_type.
3729 * @param[in] pict_type the picture type
3730 * @return A single character representing the picture type.
3732 char av_get_pict_type_char(int pict_type);
3735 * Return codec bits per sample.
3737 * @param[in] codec_id the codec
3738 * @return Number of bits per sample or zero if unknown for the given codec.
3740 int av_get_bits_per_sample(enum CodecID codec_id);
3743 * Return sample format bits per sample.
3745 * @param[in] sample_fmt the sample format
3746 * @return Number of bits per sample or zero if unknown for the given sample format.
3748 int av_get_bits_per_sample_format(enum SampleFormat sample_fmt);
3751 typedef struct AVCodecParserContext {
3753 struct AVCodecParser *parser;
3754 int64_t frame_offset; /* offset of the current frame */
3755 int64_t cur_offset; /* current offset
3756 (incremented by each av_parser_parse()) */
3757 int64_t next_frame_offset; /* offset of the next frame */
3759 int pict_type; /* XXX: Put it back in AVCodecContext. */
3761 * This field is used for proper frame duration computation in lavf.
3762 * It signals, how much longer the frame duration of the current frame
3763 * is compared to normal frame duration.
3765 * frame_duration = (1 + repeat_pict) * time_base
3767 * It is used by codecs like H.264 to display telecined material.
3769 int repeat_pict; /* XXX: Put it back in AVCodecContext. */
3770 int64_t pts; /* pts of the current frame */
3771 int64_t dts; /* dts of the current frame */
3776 int fetch_timestamp;
3778 #define AV_PARSER_PTS_NB 4
3779 int cur_frame_start_index;
3780 int64_t cur_frame_offset[AV_PARSER_PTS_NB];
3781 int64_t cur_frame_pts[AV_PARSER_PTS_NB];
3782 int64_t cur_frame_dts[AV_PARSER_PTS_NB];
3785 #define PARSER_FLAG_COMPLETE_FRAMES 0x0001
3786 #define PARSER_FLAG_ONCE 0x0002
3787 /// Set if the parser has a valid file offset
3788 #define PARSER_FLAG_FETCHED_OFFSET 0x0004
3790 int64_t offset; ///< byte offset from starting packet start
3791 int64_t cur_frame_end[AV_PARSER_PTS_NB];
3794 * Set by parser to 1 for key frames and 0 for non-key frames.
3795 * It is initialized to -1, so if the parser doesn't set this flag,
3796 * old-style fallback using FF_I_TYPE picture type as key frames
3802 * Time difference in stream time base units from the pts of this
3803 * packet to the point at which the output from the decoder has converged
3804 * independent from the availability of previous frames. That is, the
3805 * frames are virtually identical no matter if decoding started from
3806 * the very first frame or from this keyframe.
3807 * Is AV_NOPTS_VALUE if unknown.
3808 * This field is not the display duration of the current frame.
3809 * This field has no meaning if the packet does not have AV_PKT_FLAG_KEY
3812 * The purpose of this field is to allow seeking in streams that have no
3813 * keyframes in the conventional sense. It corresponds to the
3814 * recovery point SEI in H.264 and match_time_delta in NUT. It is also
3815 * essential for some types of subtitle streams to ensure that all
3816 * subtitles are correctly displayed after seeking.
3818 int64_t convergence_duration;
3820 // Timestamp generation support:
3822 * Synchronization point for start of timestamp generation.
3824 * Set to >0 for sync point, 0 for no sync point and <0 for undefined
3827 * For example, this corresponds to presence of H.264 buffering period
3833 * Offset of the current timestamp against last timestamp sync point in
3834 * units of AVCodecContext.time_base.
3836 * Set to INT_MIN when dts_sync_point unused. Otherwise, it must
3837 * contain a valid timestamp offset.
3839 * Note that the timestamp of sync point has usually a nonzero
3840 * dts_ref_dts_delta, which refers to the previous sync point. Offset of
3841 * the next frame after timestamp sync point will be usually 1.
3843 * For example, this corresponds to H.264 cpb_removal_delay.
3845 int dts_ref_dts_delta;
3848 * Presentation delay of current frame in units of AVCodecContext.time_base.
3850 * Set to INT_MIN when dts_sync_point unused. Otherwise, it must
3851 * contain valid non-negative timestamp delta (presentation time of a frame
3852 * must not lie in the past).
3854 * This delay represents the difference between decoding and presentation
3855 * time of the frame.
3857 * For example, this corresponds to H.264 dpb_output_delay.
3862 * Position of the packet in file.
3864 * Analogous to cur_frame_pts/dts
3866 int64_t cur_frame_pos[AV_PARSER_PTS_NB];
3869 * Byte position of currently parsed frame in stream.
3874 * Previous frame byte position.
3877 } AVCodecParserContext;
3879 typedef struct AVCodecParser {
3880 int codec_ids[5]; /* several codec IDs are permitted */
3882 int (*parser_init)(AVCodecParserContext *s);
3883 int (*parser_parse)(AVCodecParserContext *s,
3884 AVCodecContext *avctx,
3885 const uint8_t **poutbuf, int *poutbuf_size,
3886 const uint8_t *buf, int buf_size);
3887 void (*parser_close)(AVCodecParserContext *s);
3888 int (*split)(AVCodecContext *avctx, const uint8_t *buf, int buf_size);
3889 struct AVCodecParser *next;
3892 AVCodecParser *av_parser_next(AVCodecParser *c);
3894 void av_register_codec_parser(AVCodecParser *parser);
3895 AVCodecParserContext *av_parser_init(int codec_id);
3897 #if LIBAVCODEC_VERSION_MAJOR < 53
3898 attribute_deprecated
3899 int av_parser_parse(AVCodecParserContext *s,
3900 AVCodecContext *avctx,
3901 uint8_t **poutbuf, int *poutbuf_size,
3902 const uint8_t *buf, int buf_size,
3903 int64_t pts, int64_t dts);
3909 * @param s parser context.
3910 * @param avctx codec context.
3911 * @param poutbuf set to pointer to parsed buffer or NULL if not yet finished.
3912 * @param poutbuf_size set to size of parsed buffer or zero if not yet finished.
3913 * @param buf input buffer.
3914 * @param buf_size input length, to signal EOF, this should be 0 (so that the last frame can be output).
3915 * @param pts input presentation timestamp.
3916 * @param dts input decoding timestamp.
3917 * @param pos input byte position in stream.
3918 * @return the number of bytes of the input bitstream used.
3923 * len = av_parser_parse2(myparser, AVCodecContext, &data, &size,
3930 * decode_frame(data, size);
3934 int av_parser_parse2(AVCodecParserContext *s,
3935 AVCodecContext *avctx,
3936 uint8_t **poutbuf, int *poutbuf_size,
3937 const uint8_t *buf, int buf_size,
3938 int64_t pts, int64_t dts,
3941 int av_parser_change(AVCodecParserContext *s,
3942 AVCodecContext *avctx,
3943 uint8_t **poutbuf, int *poutbuf_size,
3944 const uint8_t *buf, int buf_size, int keyframe);
3945 void av_parser_close(AVCodecParserContext *s);
3948 typedef struct AVBitStreamFilterContext {
3950 struct AVBitStreamFilter *filter;
3951 AVCodecParserContext *parser;
3952 struct AVBitStreamFilterContext *next;
3953 } AVBitStreamFilterContext;
3956 typedef struct AVBitStreamFilter {
3959 int (*filter)(AVBitStreamFilterContext *bsfc,
3960 AVCodecContext *avctx, const char *args,
3961 uint8_t **poutbuf, int *poutbuf_size,
3962 const uint8_t *buf, int buf_size, int keyframe);
3963 void (*close)(AVBitStreamFilterContext *bsfc);
3964 struct AVBitStreamFilter *next;
3965 } AVBitStreamFilter;
3967 void av_register_bitstream_filter(AVBitStreamFilter *bsf);
3968 AVBitStreamFilterContext *av_bitstream_filter_init(const char *name);
3969 int av_bitstream_filter_filter(AVBitStreamFilterContext *bsfc,
3970 AVCodecContext *avctx, const char *args,
3971 uint8_t **poutbuf, int *poutbuf_size,
3972 const uint8_t *buf, int buf_size, int keyframe);
3973 void av_bitstream_filter_close(AVBitStreamFilterContext *bsf);
3975 AVBitStreamFilter *av_bitstream_filter_next(AVBitStreamFilter *f);
3980 * Reallocate the given block if it is not large enough, otherwise do nothing.
3984 void *av_fast_realloc(void *ptr, unsigned int *size, unsigned int min_size);
3987 * Allocate a buffer, reusing the given one if large enough.
3989 * Contrary to av_fast_realloc the current buffer contents might not be
3990 * preserved and on error the old buffer is freed, thus no special
3991 * handling to avoid memleaks is necessary.
3993 * @param ptr pointer to pointer to already allocated buffer, overwritten with pointer to new buffer
3994 * @param size size of the buffer *ptr points to
3995 * @param min_size minimum size of *ptr buffer after returning, *ptr will be NULL and
3996 * *size 0 if an error occurred.
3998 void av_fast_malloc(void *ptr, unsigned int *size, unsigned int min_size);
4000 #if LIBAVCODEC_VERSION_MAJOR < 53
4002 * @deprecated Deprecated in favor of av_image_copy().
4004 attribute_deprecated
4005 void av_picture_data_copy(uint8_t *dst_data[4], int dst_linesize[4],
4006 uint8_t *src_data[4], int src_linesize[4],
4007 enum PixelFormat pix_fmt, int width, int height);
4011 * Copy image src to dst. Wraps av_picture_data_copy() above.
4013 void av_picture_copy(AVPicture *dst, const AVPicture *src,
4014 enum PixelFormat pix_fmt, int width, int height);
4017 * Crop image top and left side.
4019 int av_picture_crop(AVPicture *dst, const AVPicture *src,
4020 enum PixelFormat pix_fmt, int top_band, int left_band);
4025 int av_picture_pad(AVPicture *dst, const AVPicture *src, int height, int width, enum PixelFormat pix_fmt,
4026 int padtop, int padbottom, int padleft, int padright, int *color);
4029 * Encode extradata length to a buffer. Used by xiph codecs.
4031 * @param s buffer to write to; must be at least (v/255+1) bytes long
4032 * @param v size of extradata in bytes
4033 * @return number of bytes written to the buffer.
4035 unsigned int av_xiphlacing(unsigned char *s, unsigned int v);
4037 #if LIBAVCODEC_VERSION_MAJOR < 53
4039 * Parse str and put in width_ptr and height_ptr the detected values.
4041 * @deprecated Deprecated in favor of av_parse_video_size().
4043 attribute_deprecated int av_parse_video_frame_size(int *width_ptr, int *height_ptr, const char *str);
4046 * Parse str and store the detected values in *frame_rate.
4048 * @deprecated Deprecated in favor of av_parse_video_rate().
4050 attribute_deprecated int av_parse_video_frame_rate(AVRational *frame_rate, const char *str);
4054 * Logs a generic warning message about a missing feature. This function is
4055 * intended to be used internally by FFmpeg (libavcodec, libavformat, etc.)
4056 * only, and would normally not be used by applications.
4057 * @param[in] avc a pointer to an arbitrary struct of which the first field is
4058 * a pointer to an AVClass struct
4059 * @param[in] feature string containing the name of the missing feature
4060 * @param[in] want_sample indicates if samples are wanted which exhibit this feature.
4061 * If want_sample is non-zero, additional verbage will be added to the log
4062 * message which tells the user how to report samples to the development
4065 void av_log_missing_feature(void *avc, const char *feature, int want_sample);
4068 * Log a generic warning message asking for a sample. This function is
4069 * intended to be used internally by FFmpeg (libavcodec, libavformat, etc.)
4070 * only, and would normally not be used by applications.
4071 * @param[in] avc a pointer to an arbitrary struct of which the first field is
4072 * a pointer to an AVClass struct
4073 * @param[in] msg string containing an optional message, or NULL if no message
4075 void av_log_ask_for_sample(void *avc, const char *msg);
4078 * Register the hardware accelerator hwaccel.
4080 void av_register_hwaccel(AVHWAccel *hwaccel);
4083 * If hwaccel is NULL, returns the first registered hardware accelerator,
4084 * if hwaccel is non-NULL, returns the next registered hardware accelerator
4085 * after hwaccel, or NULL if hwaccel is the last one.
4087 AVHWAccel *av_hwaccel_next(AVHWAccel *hwaccel);
4091 * Lock operation used by lockmgr
4094 AV_LOCK_CREATE, ///< Create a mutex
4095 AV_LOCK_OBTAIN, ///< Lock the mutex
4096 AV_LOCK_RELEASE, ///< Unlock the mutex
4097 AV_LOCK_DESTROY, ///< Free mutex resources
4101 * Register a user provided lock manager supporting the operations
4102 * specified by AVLockOp. mutex points to a (void *) where the
4103 * lockmgr should store/get a pointer to a user allocated mutex. It's
4104 * NULL upon AV_LOCK_CREATE and != NULL for all other ops.
4106 * @param cb User defined callback. Note: FFmpeg may invoke calls to this
4107 * callback during the call to av_lockmgr_register().
4108 * Thus, the application must be prepared to handle that.
4109 * If cb is set to NULL the lockmgr will be unregistered.
4110 * Also note that during unregistration the previously registered
4111 * lockmgr callback may also be invoked.
4113 int av_lockmgr_register(int (*cb)(void **mutex, enum AVLockOp op));
4115 #endif /* AVCODEC_AVCODEC_H */