2 * copyright (c) 2001 Fabrice Bellard
4 * This file is part of FFmpeg.
6 * FFmpeg is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
11 * FFmpeg is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with FFmpeg; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21 #ifndef AVCODEC_AVCODEC_H
22 #define AVCODEC_AVCODEC_H
30 #include "libavutil/avutil.h"
31 #include "libavutil/cpu.h"
33 #define LIBAVCODEC_VERSION_MAJOR 52
34 #define LIBAVCODEC_VERSION_MINOR 91
35 #define LIBAVCODEC_VERSION_MICRO 1
37 #define LIBAVCODEC_VERSION_INT AV_VERSION_INT(LIBAVCODEC_VERSION_MAJOR, \
38 LIBAVCODEC_VERSION_MINOR, \
39 LIBAVCODEC_VERSION_MICRO)
40 #define LIBAVCODEC_VERSION AV_VERSION(LIBAVCODEC_VERSION_MAJOR, \
41 LIBAVCODEC_VERSION_MINOR, \
42 LIBAVCODEC_VERSION_MICRO)
43 #define LIBAVCODEC_BUILD LIBAVCODEC_VERSION_INT
45 #define LIBAVCODEC_IDENT "Lavc" AV_STRINGIFY(LIBAVCODEC_VERSION)
48 * Those FF_API_* defines are not part of public API.
49 * They may change, break or disappear at any time.
51 #ifndef FF_API_PALETTE_CONTROL
52 #define FF_API_PALETTE_CONTROL (LIBAVCODEC_VERSION_MAJOR < 54)
54 #ifndef FF_API_MM_FLAGS
55 #define FF_API_MM_FLAGS (LIBAVCODEC_VERSION_MAJOR < 53)
57 #ifndef FF_API_OPT_SHOW
58 #define FF_API_OPT_SHOW (LIBAVCODEC_VERSION_MAJOR < 53)
60 #ifndef FF_API_AUDIO_OLD
61 #define FF_API_AUDIO_OLD (LIBAVCODEC_VERSION_MAJOR < 53)
63 #ifndef FF_API_VIDEO_OLD
64 #define FF_API_VIDEO_OLD (LIBAVCODEC_VERSION_MAJOR < 53)
67 #define AV_NOPTS_VALUE INT64_C(0x8000000000000000)
68 #define AV_TIME_BASE 1000000
69 #define AV_TIME_BASE_Q (AVRational){1, AV_TIME_BASE}
72 * Identify the syntax and semantics of the bitstream.
73 * The principle is roughly:
74 * Two decoders with the same ID can decode the same streams.
75 * Two encoders with the same ID can encode compatible streams.
76 * There may be slight deviations from the principle due to implementation
79 * If you add a codec ID to this list, add it so that
80 * 1. no value of a existing codec ID changes (that would break ABI),
81 * 2. it is as close as possible to similar codecs.
88 CODEC_ID_MPEG2VIDEO, ///< preferred ID for MPEG-1/2 video decoding
89 CODEC_ID_MPEG2VIDEO_XVMC,
126 CODEC_ID_INTERPLAY_VIDEO,
138 CODEC_ID_TRUEMOTION1,
149 #if LIBAVCODEC_VERSION_MAJOR < 53
168 CODEC_ID_TRUEMOTION2,
185 CODEC_ID_DSICINVIDEO,
186 CODEC_ID_TIERTEXSEQVIDEO,
195 CODEC_ID_BETHSOFTVID,
213 CODEC_ID_MOTIONPIXELS,
231 CODEC_ID_IFF_BYTERUN1,
241 /* various PCM "codecs" */
242 CODEC_ID_PCM_S16LE= 0x10000,
258 CODEC_ID_PCM_S24DAUD,
260 CODEC_ID_PCM_S16LE_PLANAR,
268 /* various ADPCM codecs */
269 CODEC_ID_ADPCM_IMA_QT= 0x11000,
270 CODEC_ID_ADPCM_IMA_WAV,
271 CODEC_ID_ADPCM_IMA_DK3,
272 CODEC_ID_ADPCM_IMA_DK4,
273 CODEC_ID_ADPCM_IMA_WS,
274 CODEC_ID_ADPCM_IMA_SMJPEG,
283 CODEC_ID_ADPCM_YAMAHA,
284 CODEC_ID_ADPCM_SBPRO_4,
285 CODEC_ID_ADPCM_SBPRO_3,
286 CODEC_ID_ADPCM_SBPRO_2,
288 CODEC_ID_ADPCM_IMA_AMV,
289 CODEC_ID_ADPCM_EA_R1,
290 CODEC_ID_ADPCM_EA_R3,
291 CODEC_ID_ADPCM_EA_R2,
292 CODEC_ID_ADPCM_IMA_EA_SEAD,
293 CODEC_ID_ADPCM_IMA_EA_EACS,
294 CODEC_ID_ADPCM_EA_XAS,
295 CODEC_ID_ADPCM_EA_MAXIS_XA,
296 CODEC_ID_ADPCM_IMA_ISS,
300 CODEC_ID_AMR_NB= 0x12000,
303 /* RealAudio codecs*/
304 CODEC_ID_RA_144= 0x13000,
307 /* various DPCM codecs */
308 CODEC_ID_ROQ_DPCM= 0x14000,
309 CODEC_ID_INTERPLAY_DPCM,
314 CODEC_ID_MP2= 0x15000,
315 CODEC_ID_MP3, ///< preferred ID for decoding MPEG audio layer 1, 2 or 3
333 CODEC_ID_WESTWOOD_SND1,
334 CODEC_ID_GSM, ///< as in Berlin toast format
342 CODEC_ID_DSICINAUDIO,
346 CODEC_ID_GSM_MS, /* as found in WAV */
355 CODEC_ID_WMALOSSLESS,
364 CODEC_ID_BINKAUDIO_RDFT,
365 CODEC_ID_BINKAUDIO_DCT,
367 /* subtitle codecs */
368 CODEC_ID_DVD_SUBTITLE= 0x17000,
369 CODEC_ID_DVB_SUBTITLE,
370 CODEC_ID_TEXT, ///< raw UTF-8 text
374 CODEC_ID_HDMV_PGS_SUBTITLE,
375 CODEC_ID_DVB_TELETEXT,
378 /* other specific kind of codecs (generally used for attachments) */
379 CODEC_ID_TTF= 0x18000,
381 CODEC_ID_PROBE= 0x19000, ///< codec_id is not known (like CODEC_ID_NONE) but lavf should attempt to identify it
383 CODEC_ID_MPEG2TS= 0x20000, /**< _FAKE_ codec to indicate a raw MPEG-2 TS
384 * stream (only used by libavformat) */
387 #if LIBAVCODEC_VERSION_MAJOR < 53
388 #define CodecType AVMediaType
390 #define CODEC_TYPE_UNKNOWN AVMEDIA_TYPE_UNKNOWN
391 #define CODEC_TYPE_VIDEO AVMEDIA_TYPE_VIDEO
392 #define CODEC_TYPE_AUDIO AVMEDIA_TYPE_AUDIO
393 #define CODEC_TYPE_DATA AVMEDIA_TYPE_DATA
394 #define CODEC_TYPE_SUBTITLE AVMEDIA_TYPE_SUBTITLE
395 #define CODEC_TYPE_ATTACHMENT AVMEDIA_TYPE_ATTACHMENT
396 #define CODEC_TYPE_NB AVMEDIA_TYPE_NB
400 * all in native-endian format
403 SAMPLE_FMT_NONE = -1,
404 SAMPLE_FMT_U8, ///< unsigned 8 bits
405 SAMPLE_FMT_S16, ///< signed 16 bits
406 SAMPLE_FMT_S32, ///< signed 32 bits
407 SAMPLE_FMT_FLT, ///< float
408 SAMPLE_FMT_DBL, ///< double
409 SAMPLE_FMT_NB ///< Number of sample formats. DO NOT USE if dynamically linking to libavcodec
412 /* Audio channel masks */
413 #define CH_FRONT_LEFT 0x00000001
414 #define CH_FRONT_RIGHT 0x00000002
415 #define CH_FRONT_CENTER 0x00000004
416 #define CH_LOW_FREQUENCY 0x00000008
417 #define CH_BACK_LEFT 0x00000010
418 #define CH_BACK_RIGHT 0x00000020
419 #define CH_FRONT_LEFT_OF_CENTER 0x00000040
420 #define CH_FRONT_RIGHT_OF_CENTER 0x00000080
421 #define CH_BACK_CENTER 0x00000100
422 #define CH_SIDE_LEFT 0x00000200
423 #define CH_SIDE_RIGHT 0x00000400
424 #define CH_TOP_CENTER 0x00000800
425 #define CH_TOP_FRONT_LEFT 0x00001000
426 #define CH_TOP_FRONT_CENTER 0x00002000
427 #define CH_TOP_FRONT_RIGHT 0x00004000
428 #define CH_TOP_BACK_LEFT 0x00008000
429 #define CH_TOP_BACK_CENTER 0x00010000
430 #define CH_TOP_BACK_RIGHT 0x00020000
431 #define CH_STEREO_LEFT 0x20000000 ///< Stereo downmix.
432 #define CH_STEREO_RIGHT 0x40000000 ///< See CH_STEREO_LEFT.
434 /** Channel mask value used for AVCodecContext.request_channel_layout
435 to indicate that the user requests the channel order of the decoder output
436 to be the native codec channel order. */
437 #define CH_LAYOUT_NATIVE 0x8000000000000000LL
439 /* Audio channel convenience macros */
440 #define CH_LAYOUT_MONO (CH_FRONT_CENTER)
441 #define CH_LAYOUT_STEREO (CH_FRONT_LEFT|CH_FRONT_RIGHT)
442 #define CH_LAYOUT_2_1 (CH_LAYOUT_STEREO|CH_BACK_CENTER)
443 #define CH_LAYOUT_SURROUND (CH_LAYOUT_STEREO|CH_FRONT_CENTER)
444 #define CH_LAYOUT_4POINT0 (CH_LAYOUT_SURROUND|CH_BACK_CENTER)
445 #define CH_LAYOUT_2_2 (CH_LAYOUT_STEREO|CH_SIDE_LEFT|CH_SIDE_RIGHT)
446 #define CH_LAYOUT_QUAD (CH_LAYOUT_STEREO|CH_BACK_LEFT|CH_BACK_RIGHT)
447 #define CH_LAYOUT_5POINT0 (CH_LAYOUT_SURROUND|CH_SIDE_LEFT|CH_SIDE_RIGHT)
448 #define CH_LAYOUT_5POINT1 (CH_LAYOUT_5POINT0|CH_LOW_FREQUENCY)
449 #define CH_LAYOUT_5POINT0_BACK (CH_LAYOUT_SURROUND|CH_BACK_LEFT|CH_BACK_RIGHT)
450 #define CH_LAYOUT_5POINT1_BACK (CH_LAYOUT_5POINT0_BACK|CH_LOW_FREQUENCY)
451 #define CH_LAYOUT_7POINT0 (CH_LAYOUT_5POINT0|CH_BACK_LEFT|CH_BACK_RIGHT)
452 #define CH_LAYOUT_7POINT1 (CH_LAYOUT_5POINT1|CH_BACK_LEFT|CH_BACK_RIGHT)
453 #define CH_LAYOUT_7POINT1_WIDE (CH_LAYOUT_5POINT1_BACK|\
454 CH_FRONT_LEFT_OF_CENTER|CH_FRONT_RIGHT_OF_CENTER)
455 #define CH_LAYOUT_STEREO_DOWNMIX (CH_STEREO_LEFT|CH_STEREO_RIGHT)
458 #define AVCODEC_MAX_AUDIO_FRAME_SIZE 192000 // 1 second of 48khz 32bit audio
461 * Required number of additionally allocated bytes at the end of the input bitstream for decoding.
462 * This is mainly needed because some optimized bitstream readers read
463 * 32 or 64 bit at once and could read over the end.<br>
464 * Note: If the first 23 bits of the additional bytes are not 0, then damaged
465 * MPEG bitstreams could cause overread and segfault.
467 #define FF_INPUT_BUFFER_PADDING_SIZE 8
470 * minimum encoding buffer size
471 * Used to avoid some checks during header writing.
473 #define FF_MIN_BUFFER_SIZE 16384
477 * motion estimation type.
480 ME_ZERO = 1, ///< no search, that is use 0,0 vector whenever one is needed
484 ME_EPZS, ///< enhanced predictive zonal search
485 ME_X1, ///< reserved for experiments
486 ME_HEX, ///< hexagon based search
487 ME_UMH, ///< uneven multi-hexagon search
488 ME_ITER, ///< iterative search
489 ME_TESA, ///< transformed exhaustive search algorithm
493 /* We leave some space between them for extensions (drop some
494 * keyframes for intra-only or drop just some bidir frames). */
495 AVDISCARD_NONE =-16, ///< discard nothing
496 AVDISCARD_DEFAULT= 0, ///< discard useless packets like 0 size packets in avi
497 AVDISCARD_NONREF = 8, ///< discard all non reference
498 AVDISCARD_BIDIR = 16, ///< discard all bidirectional frames
499 AVDISCARD_NONKEY = 32, ///< discard all frames except keyframes
500 AVDISCARD_ALL = 48, ///< discard all
503 enum AVColorPrimaries{
504 AVCOL_PRI_BT709 =1, ///< also ITU-R BT1361 / IEC 61966-2-4 / SMPTE RP177 Annex B
505 AVCOL_PRI_UNSPECIFIED=2,
507 AVCOL_PRI_BT470BG =5, ///< also ITU-R BT601-6 625 / ITU-R BT1358 625 / ITU-R BT1700 625 PAL & SECAM
508 AVCOL_PRI_SMPTE170M =6, ///< also ITU-R BT601-6 525 / ITU-R BT1358 525 / ITU-R BT1700 NTSC
509 AVCOL_PRI_SMPTE240M =7, ///< functionally identical to above
511 AVCOL_PRI_NB , ///< Not part of ABI
514 enum AVColorTransferCharacteristic{
515 AVCOL_TRC_BT709 =1, ///< also ITU-R BT1361
516 AVCOL_TRC_UNSPECIFIED=2,
517 AVCOL_TRC_GAMMA22 =4, ///< also ITU-R BT470M / ITU-R BT1700 625 PAL & SECAM
518 AVCOL_TRC_GAMMA28 =5, ///< also ITU-R BT470BG
519 AVCOL_TRC_NB , ///< Not part of ABI
524 AVCOL_SPC_BT709 =1, ///< also ITU-R BT1361 / IEC 61966-2-4 xvYCC709 / SMPTE RP177 Annex B
525 AVCOL_SPC_UNSPECIFIED=2,
527 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
528 AVCOL_SPC_SMPTE170M =6, ///< also ITU-R BT601-6 525 / ITU-R BT1358 525 / ITU-R BT1700 NTSC / functionally identical to above
529 AVCOL_SPC_SMPTE240M =7,
530 AVCOL_SPC_NB , ///< Not part of ABI
534 AVCOL_RANGE_UNSPECIFIED=0,
535 AVCOL_RANGE_MPEG =1, ///< the normal 219*2^(n-8) "MPEG" YUV ranges
536 AVCOL_RANGE_JPEG =2, ///< the normal 2^n-1 "JPEG" YUV ranges
537 AVCOL_RANGE_NB , ///< Not part of ABI
541 * X X 3 4 X X are luma samples,
542 * 1 2 1-6 are possible chroma positions
543 * X X 5 6 X 0 is undefined/unknown position
545 enum AVChromaLocation{
546 AVCHROMA_LOC_UNSPECIFIED=0,
547 AVCHROMA_LOC_LEFT =1, ///< mpeg2/4, h264 default
548 AVCHROMA_LOC_CENTER =2, ///< mpeg1, jpeg, h263
549 AVCHROMA_LOC_TOPLEFT =3, ///< DV
551 AVCHROMA_LOC_BOTTOMLEFT =5,
552 AVCHROMA_LOC_BOTTOM =6,
553 AVCHROMA_LOC_NB , ///< Not part of ABI
560 AV_LPC_TYPE_DEFAULT = -1, ///< use the codec default LPC type
561 AV_LPC_TYPE_NONE = 0, ///< do not use LPC prediction or use all zero coefficients
562 AV_LPC_TYPE_FIXED = 1, ///< fixed LPC coefficients
563 AV_LPC_TYPE_LEVINSON = 2, ///< Levinson-Durbin recursion
564 AV_LPC_TYPE_CHOLESKY = 3, ///< Cholesky factorization
565 AV_LPC_TYPE_NB , ///< Not part of ABI
568 typedef struct RcOverride{
571 int qscale; // If this is 0 then quality_factor will be used instead.
572 float quality_factor;
575 #define FF_MAX_B_FRAMES 16
578 These flags can be passed in AVCodecContext.flags before initialization.
579 Note: Not everything is supported yet.
582 #define CODEC_FLAG_QSCALE 0x0002 ///< Use fixed qscale.
583 #define CODEC_FLAG_4MV 0x0004 ///< 4 MV per MB allowed / advanced prediction for H.263.
584 #define CODEC_FLAG_QPEL 0x0010 ///< Use qpel MC.
585 #define CODEC_FLAG_GMC 0x0020 ///< Use GMC.
586 #define CODEC_FLAG_MV0 0x0040 ///< Always try a MB with MV=<0,0>.
587 #define CODEC_FLAG_PART 0x0080 ///< Use data partitioning.
589 * The parent program guarantees that the input for B-frames containing
590 * streams is not written to for at least s->max_b_frames+1 frames, if
591 * this is not set the input will be copied.
593 #define CODEC_FLAG_INPUT_PRESERVED 0x0100
594 #define CODEC_FLAG_PASS1 0x0200 ///< Use internal 2pass ratecontrol in first pass mode.
595 #define CODEC_FLAG_PASS2 0x0400 ///< Use internal 2pass ratecontrol in second pass mode.
596 #define CODEC_FLAG_EXTERN_HUFF 0x1000 ///< Use external Huffman table (for MJPEG).
597 #define CODEC_FLAG_GRAY 0x2000 ///< Only decode/encode grayscale.
598 #define CODEC_FLAG_EMU_EDGE 0x4000 ///< Don't draw edges.
599 #define CODEC_FLAG_PSNR 0x8000 ///< error[?] variables will be set during encoding.
600 #define CODEC_FLAG_TRUNCATED 0x00010000 /** Input bitstream might be truncated at a random
601 location instead of only at frame boundaries. */
602 #define CODEC_FLAG_NORMALIZE_AQP 0x00020000 ///< Normalize adaptive quantization.
603 #define CODEC_FLAG_INTERLACED_DCT 0x00040000 ///< Use interlaced DCT.
604 #define CODEC_FLAG_LOW_DELAY 0x00080000 ///< Force low delay.
605 #define CODEC_FLAG_ALT_SCAN 0x00100000 ///< Use alternate scan.
606 #define CODEC_FLAG_GLOBAL_HEADER 0x00400000 ///< Place global headers in extradata instead of every keyframe.
607 #define CODEC_FLAG_BITEXACT 0x00800000 ///< Use only bitexact stuff (except (I)DCT).
608 /* Fx : Flag for h263+ extra options */
609 #define CODEC_FLAG_AC_PRED 0x01000000 ///< H.263 advanced intra coding / MPEG-4 AC prediction
610 #define CODEC_FLAG_H263P_UMV 0x02000000 ///< unlimited motion vector
611 #define CODEC_FLAG_CBP_RD 0x04000000 ///< Use rate distortion optimization for cbp.
612 #define CODEC_FLAG_QP_RD 0x08000000 ///< Use rate distortion optimization for qp selectioon.
613 #define CODEC_FLAG_H263P_AIV 0x00000008 ///< H.263 alternative inter VLC
614 #define CODEC_FLAG_OBMC 0x00000001 ///< OBMC
615 #define CODEC_FLAG_LOOP_FILTER 0x00000800 ///< loop filter
616 #define CODEC_FLAG_H263P_SLICE_STRUCT 0x10000000
617 #define CODEC_FLAG_INTERLACED_ME 0x20000000 ///< interlaced motion estimation
618 #define CODEC_FLAG_SVCD_SCAN_OFFSET 0x40000000 ///< Will reserve space for SVCD scan offset user data.
619 #define CODEC_FLAG_CLOSED_GOP 0x80000000
620 #define CODEC_FLAG2_FAST 0x00000001 ///< Allow non spec compliant speedup tricks.
621 #define CODEC_FLAG2_STRICT_GOP 0x00000002 ///< Strictly enforce GOP size.
622 #define CODEC_FLAG2_NO_OUTPUT 0x00000004 ///< Skip bitstream encoding.
623 #define CODEC_FLAG2_LOCAL_HEADER 0x00000008 ///< Place global headers at every keyframe instead of in extradata.
624 #define CODEC_FLAG2_BPYRAMID 0x00000010 ///< H.264 allow B-frames to be used as references.
625 #define CODEC_FLAG2_WPRED 0x00000020 ///< H.264 weighted biprediction for B-frames
626 #define CODEC_FLAG2_MIXED_REFS 0x00000040 ///< H.264 one reference per partition, as opposed to one reference per macroblock
627 #define CODEC_FLAG2_8X8DCT 0x00000080 ///< H.264 high profile 8x8 transform
628 #define CODEC_FLAG2_FASTPSKIP 0x00000100 ///< H.264 fast pskip
629 #define CODEC_FLAG2_AUD 0x00000200 ///< H.264 access unit delimiters
630 #define CODEC_FLAG2_BRDO 0x00000400 ///< B-frame rate-distortion optimization
631 #define CODEC_FLAG2_INTRA_VLC 0x00000800 ///< Use MPEG-2 intra VLC table.
632 #define CODEC_FLAG2_MEMC_ONLY 0x00001000 ///< Only do ME/MC (I frames -> ref, P frame -> ME+MC).
633 #define CODEC_FLAG2_DROP_FRAME_TIMECODE 0x00002000 ///< timecode is in drop frame format.
634 #define CODEC_FLAG2_SKIP_RD 0x00004000 ///< RD optimal MB level residual skipping
635 #define CODEC_FLAG2_CHUNKS 0x00008000 ///< Input bitstream might be truncated at a packet boundaries instead of only at frame boundaries.
636 #define CODEC_FLAG2_NON_LINEAR_QUANT 0x00010000 ///< Use MPEG-2 nonlinear quantizer.
637 #define CODEC_FLAG2_BIT_RESERVOIR 0x00020000 ///< Use a bit reservoir when encoding if possible
638 #define CODEC_FLAG2_MBTREE 0x00040000 ///< Use macroblock tree ratecontrol (x264 only)
639 #define CODEC_FLAG2_PSY 0x00080000 ///< Use psycho visual optimizations.
640 #define CODEC_FLAG2_SSIM 0x00100000 ///< Compute SSIM during encoding, error[] values are undefined.
641 #define CODEC_FLAG2_INTRA_REFRESH 0x00200000 ///< Use periodic insertion of intra blocks instead of keyframes.
643 /* Unsupported options :
644 * Syntax Arithmetic coding (SAC)
645 * Reference Picture Selection
646 * Independent Segment Decoding */
648 /* codec capabilities */
650 #define CODEC_CAP_DRAW_HORIZ_BAND 0x0001 ///< Decoder can use draw_horiz_band callback.
652 * Codec uses get_buffer() for allocating buffers and supports custom allocators.
653 * If not set, it might not use get_buffer() at all or use operations that
654 * assume the buffer was allocated by avcodec_default_get_buffer.
656 #define CODEC_CAP_DR1 0x0002
657 /* If 'parse_only' field is true, then avcodec_parse_frame() can be used. */
658 #define CODEC_CAP_PARSE_ONLY 0x0004
659 #define CODEC_CAP_TRUNCATED 0x0008
660 /* Codec can export data for HW decoding (XvMC). */
661 #define CODEC_CAP_HWACCEL 0x0010
663 * Codec has a nonzero delay and needs to be fed with NULL at the end to get the delayed data.
664 * If this is not set, the codec is guaranteed to never be fed with NULL data.
666 #define CODEC_CAP_DELAY 0x0020
668 * Codec can be fed a final frame with a smaller size.
669 * This can be used to prevent truncation of the last audio samples.
671 #define CODEC_CAP_SMALL_LAST_FRAME 0x0040
673 * Codec can export data for HW decoding (VDPAU).
675 #define CODEC_CAP_HWACCEL_VDPAU 0x0080
677 * Codec can output multiple frames per AVPacket
678 * Normally demuxers return one frame at a time, demuxers which do not do
679 * are connected to a parser to split what they return into proper frames.
680 * This flag is reserved to the very rare category of codecs which have a
681 * bitstream that cannot be split into frames without timeconsuming
682 * operations like full decoding. Demuxers carring such bitstreams thus
683 * may return multiple frames in a packet. This has many disadvantages like
684 * prohibiting stream copy in many cases thus it should only be considered
687 #define CODEC_CAP_SUBFRAMES 0x0100
689 * Codec is experimental and is thus avoided in favor of non experimental
692 #define CODEC_CAP_EXPERIMENTAL 0x0200
694 //The following defines may change, don't expect compatibility if you use them.
695 #define MB_TYPE_INTRA4x4 0x0001
696 #define MB_TYPE_INTRA16x16 0x0002 //FIXME H.264-specific
697 #define MB_TYPE_INTRA_PCM 0x0004 //FIXME H.264-specific
698 #define MB_TYPE_16x16 0x0008
699 #define MB_TYPE_16x8 0x0010
700 #define MB_TYPE_8x16 0x0020
701 #define MB_TYPE_8x8 0x0040
702 #define MB_TYPE_INTERLACED 0x0080
703 #define MB_TYPE_DIRECT2 0x0100 //FIXME
704 #define MB_TYPE_ACPRED 0x0200
705 #define MB_TYPE_GMC 0x0400
706 #define MB_TYPE_SKIP 0x0800
707 #define MB_TYPE_P0L0 0x1000
708 #define MB_TYPE_P1L0 0x2000
709 #define MB_TYPE_P0L1 0x4000
710 #define MB_TYPE_P1L1 0x8000
711 #define MB_TYPE_L0 (MB_TYPE_P0L0 | MB_TYPE_P1L0)
712 #define MB_TYPE_L1 (MB_TYPE_P0L1 | MB_TYPE_P1L1)
713 #define MB_TYPE_L0L1 (MB_TYPE_L0 | MB_TYPE_L1)
714 #define MB_TYPE_QUANT 0x00010000
715 #define MB_TYPE_CBP 0x00020000
716 //Note bits 24-31 are reserved for codec specific use (h264 ref0, mpeg1 0mv, ...)
720 * This specifies the area which should be displayed.
721 * Note there may be multiple such areas for one frame.
723 typedef struct AVPanScan{
726 * - encoding: Set by user.
727 * - decoding: Set by libavcodec.
732 * width and height in 1/16 pel
733 * - encoding: Set by user.
734 * - decoding: Set by libavcodec.
740 * position of the top left corner in 1/16 pel for up to 3 fields/frames
741 * - encoding: Set by user.
742 * - decoding: Set by libavcodec.
744 int16_t position[3][2];
747 #define FF_COMMON_FRAME \
749 * pointer to the picture planes.\
750 * This might be different from the first allocated byte\
757 * pointer to the first allocated byte of the picture. Can be used in get_buffer/release_buffer.\
758 * This isn't used by libavcodec unless the default get/release_buffer() is used.\
764 * 1 -> keyframe, 0-> not\
765 * - encoding: Set by libavcodec.\
766 * - decoding: Set by libavcodec.\
771 * Picture type of the frame, see ?_TYPE below.\
772 * - encoding: Set by libavcodec. for coded_picture (and set by user for input).\
773 * - decoding: Set by libavcodec.\
778 * presentation timestamp in time_base units (time when frame should be shown to user)\
779 * If AV_NOPTS_VALUE then frame_rate = 1/time_base will be assumed.\
780 * - encoding: MUST be set by user.\
781 * - decoding: Set by libavcodec.\
786 * picture number in bitstream order\
787 * - encoding: set by\
788 * - decoding: Set by libavcodec.\
790 int coded_picture_number;\
792 * picture number in display order\
793 * - encoding: set by\
794 * - decoding: Set by libavcodec.\
796 int display_picture_number;\
799 * quality (between 1 (good) and FF_LAMBDA_MAX (bad)) \
800 * - encoding: Set by libavcodec. for coded_picture (and set by user for input).\
801 * - decoding: Set by libavcodec.\
806 * buffer age (1->was last buffer and dint change, 2->..., ...).\
807 * Set to INT_MAX if the buffer has not been used yet.\
808 * - encoding: unused\
809 * - decoding: MUST be set by get_buffer().\
814 * is this picture used as reference\
815 * The values for this are the same as the MpegEncContext.picture_structure\
816 * variable, that is 1->top field, 2->bottom field, 3->frame/both fields.\
817 * Set to 4 for delayed, non-reference frames.\
818 * - encoding: unused\
819 * - decoding: Set by libavcodec. (before get_buffer() call)).\
825 * - encoding: unused\
826 * - decoding: Set by libavcodec.\
828 int8_t *qscale_table;\
831 * - encoding: unused\
832 * - decoding: Set by libavcodec.\
837 * mbskip_table[mb]>=1 if MB didn't change\
838 * stride= mb_width = (width+15)>>4\
839 * - encoding: unused\
840 * - decoding: Set by libavcodec.\
842 uint8_t *mbskip_table;\
845 * motion vector table\
848 * int mv_sample_log2= 4 - motion_subsample_log2;\
849 * int mb_width= (width+15)>>4;\
850 * int mv_stride= (mb_width << mv_sample_log2) + 1;\
851 * motion_val[direction][x + y*mv_stride][0->mv_x, 1->mv_y];\
853 * - encoding: Set by user.\
854 * - decoding: Set by libavcodec.\
856 int16_t (*motion_val[2])[2];\
859 * macroblock type table\
860 * mb_type_base + mb_width + 2\
861 * - encoding: Set by user.\
862 * - decoding: Set by libavcodec.\
867 * log2 of the size of the block which a single vector in motion_val represents: \
868 * (4->16x16, 3->8x8, 2-> 4x4, 1-> 2x2)\
869 * - encoding: unused\
870 * - decoding: Set by libavcodec.\
872 uint8_t motion_subsample_log2;\
875 * for some private data of the user\
876 * - encoding: unused\
877 * - decoding: Set by user.\
883 * - encoding: Set by libavcodec. if flags&CODEC_FLAG_PSNR.\
884 * - decoding: unused\
889 * type of the buffer (to keep track of who has to deallocate data[*])\
890 * - encoding: Set by the one who allocates it.\
891 * - decoding: Set by the one who allocates it.\
892 * Note: User allocated (direct rendering) & internal buffers cannot coexist currently.\
897 * When decoding, this signals how much the picture must be delayed.\
898 * extra_delay = repeat_pict / (2*fps)\
899 * - encoding: unused\
900 * - decoding: Set by libavcodec.\
910 * The content of the picture is interlaced.\
911 * - encoding: Set by user.\
912 * - decoding: Set by libavcodec. (default 0)\
914 int interlaced_frame;\
917 * If the content is interlaced, is top field displayed first.\
918 * - encoding: Set by user.\
919 * - decoding: Set by libavcodec.\
921 int top_field_first;\
925 * - encoding: Set by user.\
926 * - decoding: Set by libavcodec.\
928 AVPanScan *pan_scan;\
931 * Tell user application that palette has changed from previous frame.\
932 * - encoding: ??? (no palette-enabled encoder yet)\
933 * - decoding: Set by libavcodec. (default 0).\
935 int palette_has_changed;\
938 * codec suggestion on buffer type if != 0\
939 * - encoding: unused\
940 * - decoding: Set by libavcodec. (before get_buffer() call)).\
946 * - encoding: unused\
947 * - decoding: Set by libavcodec.\
952 * motion reference frame index\
953 * the order in which these are stored can depend on the codec.\
954 * - encoding: Set by user.\
955 * - decoding: Set by libavcodec.\
957 int8_t *ref_index[2];\
960 * reordered opaque 64bit number (generally a PTS) from AVCodecContext.reordered_opaque\
961 * output in AVFrame.reordered_opaque\
962 * - encoding: unused\
963 * - decoding: Read by user.\
965 int64_t reordered_opaque;\
968 * hardware accelerator private data (FFmpeg allocated)\
969 * - encoding: unused\
970 * - decoding: Set by libavcodec\
972 void *hwaccel_picture_private;\
975 #define FF_QSCALE_TYPE_MPEG1 0
976 #define FF_QSCALE_TYPE_MPEG2 1
977 #define FF_QSCALE_TYPE_H264 2
978 #define FF_QSCALE_TYPE_VP56 3
980 #define FF_BUFFER_TYPE_INTERNAL 1
981 #define FF_BUFFER_TYPE_USER 2 ///< direct rendering buffers (image is (de)allocated by user)
982 #define FF_BUFFER_TYPE_SHARED 4 ///< Buffer from somewhere else; don't deallocate image (data/base), all other tables are not shared.
983 #define FF_BUFFER_TYPE_COPY 8 ///< Just a (modified) copy of some other buffer, don't deallocate anything.
986 #define FF_I_TYPE 1 ///< Intra
987 #define FF_P_TYPE 2 ///< Predicted
988 #define FF_B_TYPE 3 ///< Bi-dir predicted
989 #define FF_S_TYPE 4 ///< S(GMC)-VOP MPEG4
990 #define FF_SI_TYPE 5 ///< Switching Intra
991 #define FF_SP_TYPE 6 ///< Switching Predicted
994 #define FF_BUFFER_HINTS_VALID 0x01 // Buffer hints value is meaningful (if 0 ignore).
995 #define FF_BUFFER_HINTS_READABLE 0x02 // Codec will read from buffer.
996 #define FF_BUFFER_HINTS_PRESERVE 0x04 // User must not alter buffer content.
997 #define FF_BUFFER_HINTS_REUSABLE 0x08 // Codec will reuse the buffer (update).
999 typedef struct AVPacket {
1001 * Presentation timestamp in AVStream->time_base units; the time at which
1002 * the decompressed packet will be presented to the user.
1003 * Can be AV_NOPTS_VALUE if it is not stored in the file.
1004 * pts MUST be larger or equal to dts as presentation cannot happen before
1005 * decompression, unless one wants to view hex dumps. Some formats misuse
1006 * the terms dts and pts/cts to mean something different. Such timestamps
1007 * must be converted to true pts/dts before they are stored in AVPacket.
1011 * Decompression timestamp in AVStream->time_base units; the time at which
1012 * the packet is decompressed.
1013 * Can be AV_NOPTS_VALUE if it is not stored in the file.
1021 * Duration of this packet in AVStream->time_base units, 0 if unknown.
1022 * Equals next_pts - this_pts in presentation order.
1025 void (*destruct)(struct AVPacket *);
1027 int64_t pos; ///< byte position in stream, -1 if unknown
1030 * Time difference in AVStream->time_base units from the pts of this
1031 * packet to the point at which the output from the decoder has converged
1032 * independent from the availability of previous frames. That is, the
1033 * frames are virtually identical no matter if decoding started from
1034 * the very first frame or from this keyframe.
1035 * Is AV_NOPTS_VALUE if unknown.
1036 * This field is not the display duration of the current packet.
1037 * This field has no meaning if the packet does not have AV_PKT_FLAG_KEY
1040 * The purpose of this field is to allow seeking in streams that have no
1041 * keyframes in the conventional sense. It corresponds to the
1042 * recovery point SEI in H.264 and match_time_delta in NUT. It is also
1043 * essential for some types of subtitle streams to ensure that all
1044 * subtitles are correctly displayed after seeking.
1046 int64_t convergence_duration;
1048 #define AV_PKT_FLAG_KEY 0x0001
1049 #if LIBAVCODEC_VERSION_MAJOR < 53
1050 #define PKT_FLAG_KEY AV_PKT_FLAG_KEY
1054 * Audio Video Frame.
1055 * New fields can be added to the end of FF_COMMON_FRAME with minor version
1057 * Removal, reordering and changes to existing fields require a major
1058 * version bump. No fields should be added into AVFrame before or after
1060 * sizeof(AVFrame) must not be used outside libav*.
1062 typedef struct AVFrame {
1067 * main external API structure.
1068 * New fields can be added to the end with minor version bumps.
1069 * Removal, reordering and changes to existing fields require a major
1071 * sizeof(AVCodecContext) must not be used outside libav*.
1073 typedef struct AVCodecContext {
1075 * information on struct for av_log
1076 * - set by avcodec_alloc_context
1078 const AVClass *av_class;
1080 * the average bitrate
1081 * - encoding: Set by user; unused for constant quantizer encoding.
1082 * - decoding: Set by libavcodec. 0 or some bitrate if this info is available in the stream.
1087 * number of bits the bitstream is allowed to diverge from the reference.
1088 * the reference can be CBR (for CBR pass1) or VBR (for pass2)
1089 * - encoding: Set by user; unused for constant quantizer encoding.
1090 * - decoding: unused
1092 int bit_rate_tolerance;
1096 * - encoding: Set by user.
1097 * - decoding: Set by user.
1102 * Some codecs need additional format info. It is stored here.
1103 * If any muxer uses this then ALL demuxers/parsers AND encoders for the
1104 * specific codec MUST set it correctly otherwise stream copy breaks.
1105 * In general use of this field by muxers is not recommanded.
1106 * - encoding: Set by libavcodec.
1107 * - decoding: Set by libavcodec. (FIXME: Is this OK?)
1112 * Motion estimation algorithm used for video coding.
1113 * 1 (zero), 2 (full), 3 (log), 4 (phods), 5 (epzs), 6 (x1), 7 (hex),
1114 * 8 (umh), 9 (iter), 10 (tesa) [7, 8, 10 are x264 specific, 9 is snow specific]
1115 * - encoding: MUST be set by user.
1116 * - decoding: unused
1121 * some codecs need / can use extradata like Huffman tables.
1122 * mjpeg: Huffman tables
1123 * rv10: additional flags
1124 * mpeg4: global headers (they can be in the bitstream or here)
1125 * The allocated memory should be FF_INPUT_BUFFER_PADDING_SIZE bytes larger
1126 * than extradata_size to avoid prolems if it is read with the bitstream reader.
1127 * The bytewise contents of extradata must not depend on the architecture or CPU endianness.
1128 * - encoding: Set/allocated/freed by libavcodec.
1129 * - decoding: Set/allocated/freed by user.
1135 * This is the fundamental unit of time (in seconds) in terms
1136 * of which frame timestamps are represented. For fixed-fps content,
1137 * timebase should be 1/framerate and timestamp increments should be
1139 * - encoding: MUST be set by user.
1140 * - decoding: Set by libavcodec.
1142 AVRational time_base;
1146 * picture width / height.
1147 * - encoding: MUST be set by user.
1148 * - decoding: Set by libavcodec.
1149 * Note: For compatibility it is possible to set this instead of
1150 * coded_width/height before decoding.
1154 #define FF_ASPECT_EXTENDED 15
1157 * the number of pictures in a group of pictures, or 0 for intra_only
1158 * - encoding: Set by user.
1159 * - decoding: unused
1164 * Pixel format, see PIX_FMT_xxx.
1165 * May be set by the demuxer if known from headers.
1166 * May be overriden by the decoder if it knows better.
1167 * - encoding: Set by user.
1168 * - decoding: Set by user if known, overridden by libavcodec if known
1170 enum PixelFormat pix_fmt;
1173 * Frame rate emulation. If not zero, the lower layer (i.e. format handler)
1174 * has to read frames at native frame rate.
1175 * - encoding: Set by user.
1176 * - decoding: unused
1181 * If non NULL, 'draw_horiz_band' is called by the libavcodec
1182 * decoder to draw a horizontal band. It improves cache usage. Not
1183 * all codecs can do that. You must check the codec capabilities
1185 * The function is also used by hardware acceleration APIs.
1186 * It is called at least once during frame decoding to pass
1187 * the data needed for hardware render.
1188 * In that mode instead of pixel data, AVFrame points to
1189 * a structure specific to the acceleration API. The application
1190 * reads the structure and can change some fields to indicate progress
1192 * - encoding: unused
1193 * - decoding: Set by user.
1194 * @param height the height of the slice
1195 * @param y the y position of the slice
1196 * @param type 1->top field, 2->bottom field, 3->frame
1197 * @param offset offset into the AVFrame.data from which the slice should be read
1199 void (*draw_horiz_band)(struct AVCodecContext *s,
1200 const AVFrame *src, int offset[4],
1201 int y, int type, int height);
1204 int sample_rate; ///< samples per second
1205 int channels; ///< number of audio channels
1208 * audio sample format
1209 * - encoding: Set by user.
1210 * - decoding: Set by libavcodec.
1212 enum SampleFormat sample_fmt; ///< sample format
1214 /* The following data should not be initialized. */
1216 * Samples per packet, initialized when calling 'init'.
1219 int frame_number; ///< audio or video frame number
1220 #if LIBAVCODEC_VERSION_MAJOR < 53
1221 int real_pict_num; ///< Returns the real picture number of previous encoded frame.
1225 * Number of frames the decoded output will be delayed relative to
1226 * the encoded input.
1227 * - encoding: Set by libavcodec.
1228 * - decoding: unused
1232 /* - encoding parameters */
1233 float qcompress; ///< amount of qscale change between easy & hard scenes (0.0-1.0)
1234 float qblur; ///< amount of qscale smoothing over time (0.0-1.0)
1238 * - encoding: Set by user.
1239 * - decoding: unused
1245 * - encoding: Set by user.
1246 * - decoding: unused
1251 * maximum quantizer difference between frames
1252 * - encoding: Set by user.
1253 * - decoding: unused
1258 * maximum number of B-frames between non-B-frames
1259 * Note: The output will be delayed by max_b_frames+1 relative to the input.
1260 * - encoding: Set by user.
1261 * - decoding: unused
1266 * qscale factor between IP and B-frames
1267 * If > 0 then the last P-frame quantizer will be used (q= lastp_q*factor+offset).
1268 * If < 0 then normal ratecontrol will be done (q= -normal_q*factor+offset).
1269 * - encoding: Set by user.
1270 * - decoding: unused
1272 float b_quant_factor;
1274 /** obsolete FIXME remove */
1276 #define FF_RC_STRATEGY_XVID 1
1278 int b_frame_strategy;
1282 * - encoding: unused
1283 * - decoding: Set by user. 1-> Skip B-frames, 2-> Skip IDCT/dequant too, 5-> Skip everything except header
1284 * @deprecated Deprecated in favor of skip_idct and skip_frame.
1288 struct AVCodec *codec;
1292 int rtp_payload_size; /* The size of the RTP payload: the coder will */
1293 /* do its best to deliver a chunk with size */
1294 /* below rtp_payload_size, the chunk will start */
1295 /* with a start code on some codecs like H.263. */
1296 /* This doesn't take account of any particular */
1297 /* headers inside the transmitted RTP payload. */
1300 /* The RTP callback: This function is called */
1301 /* every time the encoder has a packet to send. */
1302 /* It depends on the encoder if the data starts */
1303 /* with a Start Code (it should). H.263 does. */
1304 /* mb_nb contains the number of macroblocks */
1305 /* encoded in the RTP payload. */
1306 void (*rtp_callback)(struct AVCodecContext *avctx, void *data, int size, int mb_nb);
1308 /* statistics, used for 2-pass encoding */
1319 * number of bits used for the previously encoded frame
1320 * - encoding: Set by libavcodec.
1321 * - decoding: unused
1326 * Private data of the user, can be used to carry app specific stuff.
1327 * - encoding: Set by user.
1328 * - decoding: Set by user.
1332 char codec_name[32];
1333 enum AVMediaType codec_type; /* see AVMEDIA_TYPE_xxx */
1334 enum CodecID codec_id; /* see CODEC_ID_xxx */
1337 * fourcc (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A').
1338 * This is used to work around some encoder bugs.
1339 * A demuxer should set this to what is stored in the field used to identify the codec.
1340 * If there are multiple such fields in a container then the demuxer should choose the one
1341 * which maximizes the information about the used codec.
1342 * If the codec tag field in a container is larger then 32 bits then the demuxer should
1343 * remap the longer ID to 32 bits with a table or other structure. Alternatively a new
1344 * extra_codec_tag + size could be added but for this a clear advantage must be demonstrated
1346 * - encoding: Set by user, if not then the default based on codec_id will be used.
1347 * - decoding: Set by user, will be converted to uppercase by libavcodec during init.
1349 unsigned int codec_tag;
1352 * Work around bugs in encoders which sometimes cannot be detected automatically.
1353 * - encoding: Set by user
1354 * - decoding: Set by user
1356 int workaround_bugs;
1357 #define FF_BUG_AUTODETECT 1 ///< autodetection
1358 #define FF_BUG_OLD_MSMPEG4 2
1359 #define FF_BUG_XVID_ILACE 4
1360 #define FF_BUG_UMP4 8
1361 #define FF_BUG_NO_PADDING 16
1362 #define FF_BUG_AMV 32
1363 #define FF_BUG_AC_VLC 0 ///< Will be removed, libavcodec can now handle these non-compliant files by default.
1364 #define FF_BUG_QPEL_CHROMA 64
1365 #define FF_BUG_STD_QPEL 128
1366 #define FF_BUG_QPEL_CHROMA2 256
1367 #define FF_BUG_DIRECT_BLOCKSIZE 512
1368 #define FF_BUG_EDGE 1024
1369 #define FF_BUG_HPEL_CHROMA 2048
1370 #define FF_BUG_DC_CLIP 4096
1371 #define FF_BUG_MS 8192 ///< Work around various bugs in Microsoft's broken decoders.
1372 #define FF_BUG_TRUNCATED 16384
1373 //#define FF_BUG_FAKE_SCALABILITY 16 //Autodetection should work 100%.
1376 * luma single coefficient elimination threshold
1377 * - encoding: Set by user.
1378 * - decoding: unused
1380 int luma_elim_threshold;
1383 * chroma single coeff elimination threshold
1384 * - encoding: Set by user.
1385 * - decoding: unused
1387 int chroma_elim_threshold;
1390 * strictly follow the standard (MPEG4, ...).
1391 * - encoding: Set by user.
1392 * - decoding: Set by user.
1393 * Setting this to STRICT or higher means the encoder and decoder will
1394 * generally do stupid things, whereas setting it to unofficial or lower
1395 * will mean the encoder might produce output that is not supported by all
1396 * spec-compliant decoders. Decoders don't differentiate between normal,
1397 * unofficial and experimental (that is, they always try to decode things
1398 * when they can) unless they are explicitly asked to behave stupidly
1399 * (=strictly conform to the specs)
1401 int strict_std_compliance;
1402 #define FF_COMPLIANCE_VERY_STRICT 2 ///< Strictly conform to an older more strict version of the spec or reference software.
1403 #define FF_COMPLIANCE_STRICT 1 ///< Strictly conform to all the things in the spec no matter what consequences.
1404 #define FF_COMPLIANCE_NORMAL 0
1405 #if LIBAVCODEC_VERSION_MAJOR < 53
1406 #define FF_COMPLIANCE_INOFFICIAL -1 ///< Allow inofficial extensions (deprecated - use FF_COMPLIANCE_UNOFFICIAL instead).
1408 #define FF_COMPLIANCE_UNOFFICIAL -1 ///< Allow unofficial extensions
1409 #define FF_COMPLIANCE_EXPERIMENTAL -2 ///< Allow nonstandardized experimental things.
1412 * qscale offset between IP and B-frames
1413 * - encoding: Set by user.
1414 * - decoding: unused
1416 float b_quant_offset;
1419 * Error recognization; higher values will detect more errors but may
1420 * misdetect some more or less valid parts as errors.
1421 * - encoding: unused
1422 * - decoding: Set by user.
1424 int error_recognition;
1425 #define FF_ER_CAREFUL 1
1426 #define FF_ER_COMPLIANT 2
1427 #define FF_ER_AGGRESSIVE 3
1428 #define FF_ER_VERY_AGGRESSIVE 4
1431 * Called at the beginning of each frame to get a buffer for it.
1432 * If pic.reference is set then the frame will be read later by libavcodec.
1433 * avcodec_align_dimensions2() should be used to find the required width and
1434 * height, as they normally need to be rounded up to the next multiple of 16.
1435 * if CODEC_CAP_DR1 is not set then get_buffer() must call
1436 * avcodec_default_get_buffer() instead of providing buffers allocated by
1438 * - encoding: unused
1439 * - decoding: Set by libavcodec, user can override.
1441 int (*get_buffer)(struct AVCodecContext *c, AVFrame *pic);
1444 * Called to release buffers which were allocated with get_buffer.
1445 * A released buffer can be reused in get_buffer().
1446 * pic.data[*] must be set to NULL.
1447 * - encoding: unused
1448 * - decoding: Set by libavcodec, user can override.
1450 void (*release_buffer)(struct AVCodecContext *c, AVFrame *pic);
1453 * Size of the frame reordering buffer in the decoder.
1454 * For MPEG-2 it is 1 IPB or 0 low delay IP.
1455 * - encoding: Set by libavcodec.
1456 * - decoding: Set by libavcodec.
1461 * number of bytes per packet if constant and known or 0
1462 * Used by some WAV based audio codecs.
1466 int parse_only; /* - decoding only: If true, only parsing is done
1467 (function avcodec_parse_frame()). The frame
1468 data is returned. Only MPEG codecs support this now. */
1471 * 0-> h263 quant 1-> mpeg quant
1472 * - encoding: Set by user.
1473 * - decoding: unused
1478 * pass1 encoding statistics output buffer
1479 * - encoding: Set by libavcodec.
1480 * - decoding: unused
1485 * pass2 encoding statistics input buffer
1486 * Concatenated stuff from stats_out of pass1 should be placed here.
1487 * - encoding: Allocated/set/freed by user.
1488 * - decoding: unused
1493 * ratecontrol qmin qmax limiting method
1494 * 0-> clipping, 1-> use a nice continous function to limit qscale wthin qmin/qmax.
1495 * - encoding: Set by user.
1496 * - decoding: unused
1504 * ratecontrol override, see RcOverride
1505 * - encoding: Allocated/set/freed by user.
1506 * - decoding: unused
1508 RcOverride *rc_override;
1509 int rc_override_count;
1512 * rate control equation
1513 * - encoding: Set by user
1514 * - decoding: unused
1520 * - encoding: Set by user.
1521 * - decoding: unused
1527 * - encoding: Set by user.
1528 * - decoding: unused
1533 * decoder bitstream buffer size
1534 * - encoding: Set by user.
1535 * - decoding: unused
1538 float rc_buffer_aggressivity;
1541 * qscale factor between P and I-frames
1542 * If > 0 then the last p frame quantizer will be used (q= lastp_q*factor+offset).
1543 * If < 0 then normal ratecontrol will be done (q= -normal_q*factor+offset).
1544 * - encoding: Set by user.
1545 * - decoding: unused
1547 float i_quant_factor;
1550 * qscale offset between P and I-frames
1551 * - encoding: Set by user.
1552 * - decoding: unused
1554 float i_quant_offset;
1557 * initial complexity for pass1 ratecontrol
1558 * - encoding: Set by user.
1559 * - decoding: unused
1561 float rc_initial_cplx;
1564 * DCT algorithm, see FF_DCT_* below
1565 * - encoding: Set by user.
1566 * - decoding: unused
1569 #define FF_DCT_AUTO 0
1570 #define FF_DCT_FASTINT 1
1571 #define FF_DCT_INT 2
1572 #define FF_DCT_MMX 3
1573 #define FF_DCT_MLIB 4
1574 #define FF_DCT_ALTIVEC 5
1575 #define FF_DCT_FAAN 6
1578 * luminance masking (0-> disabled)
1579 * - encoding: Set by user.
1580 * - decoding: unused
1585 * temporary complexity masking (0-> disabled)
1586 * - encoding: Set by user.
1587 * - decoding: unused
1589 float temporal_cplx_masking;
1592 * spatial complexity masking (0-> disabled)
1593 * - encoding: Set by user.
1594 * - decoding: unused
1596 float spatial_cplx_masking;
1599 * p block masking (0-> disabled)
1600 * - encoding: Set by user.
1601 * - decoding: unused
1606 * darkness masking (0-> disabled)
1607 * - encoding: Set by user.
1608 * - decoding: unused
1613 * IDCT algorithm, see FF_IDCT_* below.
1614 * - encoding: Set by user.
1615 * - decoding: Set by user.
1618 #define FF_IDCT_AUTO 0
1619 #define FF_IDCT_INT 1
1620 #define FF_IDCT_SIMPLE 2
1621 #define FF_IDCT_SIMPLEMMX 3
1622 #define FF_IDCT_LIBMPEG2MMX 4
1623 #define FF_IDCT_PS2 5
1624 #define FF_IDCT_MLIB 6
1625 #define FF_IDCT_ARM 7
1626 #define FF_IDCT_ALTIVEC 8
1627 #define FF_IDCT_SH4 9
1628 #define FF_IDCT_SIMPLEARM 10
1629 #define FF_IDCT_H264 11
1630 #define FF_IDCT_VP3 12
1631 #define FF_IDCT_IPP 13
1632 #define FF_IDCT_XVIDMMX 14
1633 #define FF_IDCT_CAVS 15
1634 #define FF_IDCT_SIMPLEARMV5TE 16
1635 #define FF_IDCT_SIMPLEARMV6 17
1636 #define FF_IDCT_SIMPLEVIS 18
1637 #define FF_IDCT_WMV2 19
1638 #define FF_IDCT_FAAN 20
1639 #define FF_IDCT_EA 21
1640 #define FF_IDCT_SIMPLENEON 22
1641 #define FF_IDCT_SIMPLEALPHA 23
1642 #define FF_IDCT_BINK 24
1646 * - encoding: Set by libavcodec.
1647 * - decoding: Set by user (or 0).
1651 * slice offsets in the frame in bytes
1652 * - encoding: Set/allocated by libavcodec.
1653 * - decoding: Set/allocated by user (or NULL).
1658 * error concealment flags
1659 * - encoding: unused
1660 * - decoding: Set by user.
1662 int error_concealment;
1663 #define FF_EC_GUESS_MVS 1
1664 #define FF_EC_DEBLOCK 2
1667 * dsp_mask could be add used to disable unwanted CPU features
1668 * CPU features (i.e. MMX, SSE. ...)
1670 * With the FORCE flag you may instead enable given CPU features.
1671 * (Dangerous: Usable in case of misdetection, improper usage however will
1672 * result into program crash.)
1677 #define FF_MM_FORCE AV_CPU_FLAG_FORCE
1678 #define FF_MM_MMX AV_CPU_FLAG_MMX
1679 #define FF_MM_3DNOW AV_CPU_FLAG_3DNOW
1680 #define FF_MM_MMXEXT AV_CPU_FLAG_MMX2
1681 #define FF_MM_MMX2 AV_CPU_FLAG_MMX2
1682 #define FF_MM_SSE AV_CPU_FLAG_SSE
1683 #define FF_MM_SSE2 AV_CPU_FLAG_SSE2
1684 #define FF_MM_SSE2SLOW AV_CPU_FLAG_SSE2SLOW
1685 #define FF_MM_3DNOWEXT AV_CPU_FLAG_3DNOWEXT
1686 #define FF_MM_SSE3 AV_CPU_FLAG_SSE3
1687 #define FF_MM_SSE3SLOW AV_CPU_FLAG_SSE3SLOW
1688 #define FF_MM_SSSE3 AV_CPU_FLAG_SSSE3
1689 #define FF_MM_SSE4 AV_CPU_FLAG_SSE4
1690 #define FF_MM_SSE42 AV_CPU_FLAG_SSE42
1691 #define FF_MM_IWMMXT AV_CPU_FLAG_IWMMXT
1692 #define FF_MM_ALTIVEC AV_CPU_FLAG_ALTIVEC
1696 * bits per sample/pixel from the demuxer (needed for huffyuv).
1697 * - encoding: Set by libavcodec.
1698 * - decoding: Set by user.
1700 int bits_per_coded_sample;
1703 * prediction method (needed for huffyuv)
1704 * - encoding: Set by user.
1705 * - decoding: unused
1707 int prediction_method;
1708 #define FF_PRED_LEFT 0
1709 #define FF_PRED_PLANE 1
1710 #define FF_PRED_MEDIAN 2
1713 * sample aspect ratio (0 if unknown)
1714 * That is the width of a pixel divided by the height of the pixel.
1715 * Numerator and denominator must be relatively prime and smaller than 256 for some video standards.
1716 * - encoding: Set by user.
1717 * - decoding: Set by libavcodec.
1719 AVRational sample_aspect_ratio;
1722 * the picture in the bitstream
1723 * - encoding: Set by libavcodec.
1724 * - decoding: Set by libavcodec.
1726 AVFrame *coded_frame;
1730 * - encoding: Set by user.
1731 * - decoding: Set by user.
1734 #define FF_DEBUG_PICT_INFO 1
1735 #define FF_DEBUG_RC 2
1736 #define FF_DEBUG_BITSTREAM 4
1737 #define FF_DEBUG_MB_TYPE 8
1738 #define FF_DEBUG_QP 16
1739 #define FF_DEBUG_MV 32
1740 #define FF_DEBUG_DCT_COEFF 0x00000040
1741 #define FF_DEBUG_SKIP 0x00000080
1742 #define FF_DEBUG_STARTCODE 0x00000100
1743 #define FF_DEBUG_PTS 0x00000200
1744 #define FF_DEBUG_ER 0x00000400
1745 #define FF_DEBUG_MMCO 0x00000800
1746 #define FF_DEBUG_BUGS 0x00001000
1747 #define FF_DEBUG_VIS_QP 0x00002000
1748 #define FF_DEBUG_VIS_MB_TYPE 0x00004000
1749 #define FF_DEBUG_BUFFERS 0x00008000
1753 * - encoding: Set by user.
1754 * - decoding: Set by user.
1757 #define FF_DEBUG_VIS_MV_P_FOR 0x00000001 //visualize forward predicted MVs of P frames
1758 #define FF_DEBUG_VIS_MV_B_FOR 0x00000002 //visualize forward predicted MVs of B frames
1759 #define FF_DEBUG_VIS_MV_B_BACK 0x00000004 //visualize backward predicted MVs of B frames
1763 * - encoding: Set by libavcodec if flags&CODEC_FLAG_PSNR.
1764 * - decoding: unused
1769 * minimum MB quantizer
1770 * - encoding: unused
1771 * - decoding: unused
1776 * maximum MB quantizer
1777 * - encoding: unused
1778 * - decoding: unused
1783 * motion estimation comparison function
1784 * - encoding: Set by user.
1785 * - decoding: unused
1789 * subpixel motion estimation comparison function
1790 * - encoding: Set by user.
1791 * - decoding: unused
1795 * macroblock comparison function (not supported yet)
1796 * - encoding: Set by user.
1797 * - decoding: unused
1801 * interlaced DCT comparison function
1802 * - encoding: Set by user.
1803 * - decoding: unused
1806 #define FF_CMP_SAD 0
1807 #define FF_CMP_SSE 1
1808 #define FF_CMP_SATD 2
1809 #define FF_CMP_DCT 3
1810 #define FF_CMP_PSNR 4
1811 #define FF_CMP_BIT 5
1813 #define FF_CMP_ZERO 7
1814 #define FF_CMP_VSAD 8
1815 #define FF_CMP_VSSE 9
1816 #define FF_CMP_NSSE 10
1817 #define FF_CMP_W53 11
1818 #define FF_CMP_W97 12
1819 #define FF_CMP_DCTMAX 13
1820 #define FF_CMP_DCT264 14
1821 #define FF_CMP_CHROMA 256
1824 * ME diamond size & shape
1825 * - encoding: Set by user.
1826 * - decoding: unused
1831 * amount of previous MV predictors (2a+1 x 2a+1 square)
1832 * - encoding: Set by user.
1833 * - decoding: unused
1835 int last_predictor_count;
1838 * prepass for motion estimation
1839 * - encoding: Set by user.
1840 * - decoding: unused
1845 * motion estimation prepass comparison function
1846 * - encoding: Set by user.
1847 * - decoding: unused
1852 * ME prepass diamond size & shape
1853 * - encoding: Set by user.
1854 * - decoding: unused
1860 * - encoding: Set by user.
1861 * - decoding: unused
1863 int me_subpel_quality;
1866 * callback to negotiate the pixelFormat
1867 * @param fmt is the list of formats which are supported by the codec,
1868 * it is terminated by -1 as 0 is a valid format, the formats are ordered by quality.
1869 * The first is always the native one.
1870 * @return the chosen format
1871 * - encoding: unused
1872 * - decoding: Set by user, if not set the native format will be chosen.
1874 enum PixelFormat (*get_format)(struct AVCodecContext *s, const enum PixelFormat * fmt);
1877 * DTG active format information (additional aspect ratio
1878 * information only used in DVB MPEG-2 transport streams)
1881 * - encoding: unused
1882 * - decoding: Set by decoder.
1884 int dtg_active_format;
1885 #define FF_DTG_AFD_SAME 8
1886 #define FF_DTG_AFD_4_3 9
1887 #define FF_DTG_AFD_16_9 10
1888 #define FF_DTG_AFD_14_9 11
1889 #define FF_DTG_AFD_4_3_SP_14_9 13
1890 #define FF_DTG_AFD_16_9_SP_14_9 14
1891 #define FF_DTG_AFD_SP_4_3 15
1894 * maximum motion estimation search range in subpel units
1895 * If 0 then no limit.
1897 * - encoding: Set by user.
1898 * - decoding: unused
1903 * intra quantizer bias
1904 * - encoding: Set by user.
1905 * - decoding: unused
1907 int intra_quant_bias;
1908 #define FF_DEFAULT_QUANT_BIAS 999999
1911 * inter quantizer bias
1912 * - encoding: Set by user.
1913 * - decoding: unused
1915 int inter_quant_bias;
1919 * - encoding: unused
1920 * - decoding: Which clrtable should be used for 8bit RGB images.
1921 * Tables have to be stored somewhere. FIXME
1926 * internal_buffer count
1927 * Don't touch, used by libavcodec default_get_buffer().
1929 int internal_buffer_count;
1933 * Don't touch, used by libavcodec default_get_buffer().
1935 void *internal_buffer;
1938 * Global quality for codecs which cannot change it per frame.
1939 * This should be proportional to MPEG-1/2/4 qscale.
1940 * - encoding: Set by user.
1941 * - decoding: unused
1945 #define FF_CODER_TYPE_VLC 0
1946 #define FF_CODER_TYPE_AC 1
1947 #define FF_CODER_TYPE_RAW 2
1948 #define FF_CODER_TYPE_RLE 3
1949 #define FF_CODER_TYPE_DEFLATE 4
1952 * - encoding: Set by user.
1953 * - decoding: unused
1959 * - encoding: Set by user.
1960 * - decoding: unused
1966 * - encoding: unused
1967 * - decoding: Set by user.
1969 uint8_t * (*realloc)(struct AVCodecContext *s, uint8_t *buf, int buf_size);
1974 * - encoding: unused
1975 * - decoding: Set by user.
1978 #define SLICE_FLAG_CODED_ORDER 0x0001 ///< draw_horiz_band() is called in coded order instead of display
1979 #define SLICE_FLAG_ALLOW_FIELD 0x0002 ///< allow draw_horiz_band() with field slices (MPEG2 field pics)
1980 #define SLICE_FLAG_ALLOW_PLANE 0x0004 ///< allow draw_horiz_band() with 1 component at a time (SVQ1)
1983 * XVideo Motion Acceleration
1984 * - encoding: forbidden
1985 * - decoding: set by decoder
1987 int xvmc_acceleration;
1990 * macroblock decision mode
1991 * - encoding: Set by user.
1992 * - decoding: unused
1995 #define FF_MB_DECISION_SIMPLE 0 ///< uses mb_cmp
1996 #define FF_MB_DECISION_BITS 1 ///< chooses the one which needs the fewest bits
1997 #define FF_MB_DECISION_RD 2 ///< rate distortion
2000 * custom intra quantization matrix
2001 * - encoding: Set by user, can be NULL.
2002 * - decoding: Set by libavcodec.
2004 uint16_t *intra_matrix;
2007 * custom inter quantization matrix
2008 * - encoding: Set by user, can be NULL.
2009 * - decoding: Set by libavcodec.
2011 uint16_t *inter_matrix;
2014 * fourcc from the AVI stream header (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A').
2015 * This is used to work around some encoder bugs.
2016 * - encoding: unused
2017 * - decoding: Set by user, will be converted to uppercase by libavcodec during init.
2019 unsigned int stream_codec_tag;
2022 * scene change detection threshold
2023 * 0 is default, larger means fewer detected scene changes.
2024 * - encoding: Set by user.
2025 * - decoding: unused
2027 int scenechange_threshold;
2030 * minimum Lagrange multipler
2031 * - encoding: Set by user.
2032 * - decoding: unused
2037 * maximum Lagrange multipler
2038 * - encoding: Set by user.
2039 * - decoding: unused
2043 #if FF_API_PALETTE_CONTROL
2045 * palette control structure
2046 * - encoding: ??? (no palette-enabled encoder yet)
2047 * - decoding: Set by user.
2049 struct AVPaletteControl *palctrl;
2053 * noise reduction strength
2054 * - encoding: Set by user.
2055 * - decoding: unused
2057 int noise_reduction;
2060 * Called at the beginning of a frame to get cr buffer for it.
2061 * Buffer type (size, hints) must be the same. libavcodec won't check it.
2062 * libavcodec will pass previous buffer in pic, function should return
2063 * same buffer or new buffer with old frame "painted" into it.
2064 * If pic.data[0] == NULL must behave like get_buffer().
2065 * if CODEC_CAP_DR1 is not set then reget_buffer() must call
2066 * avcodec_default_reget_buffer() instead of providing buffers allocated by
2068 * - encoding: unused
2069 * - decoding: Set by libavcodec, user can override.
2071 int (*reget_buffer)(struct AVCodecContext *c, AVFrame *pic);
2074 * Number of bits which should be loaded into the rc buffer before decoding starts.
2075 * - encoding: Set by user.
2076 * - decoding: unused
2078 int rc_initial_buffer_occupancy;
2082 * - encoding: Set by user.
2083 * - decoding: unused
2085 int inter_threshold;
2089 * - encoding: Set by user.
2090 * - decoding: Set by user.
2095 * Simulates errors in the bitstream to test error concealment.
2096 * - encoding: Set by user.
2097 * - decoding: unused
2102 * MP3 antialias algorithm, see FF_AA_* below.
2103 * - encoding: unused
2104 * - decoding: Set by user.
2107 #define FF_AA_AUTO 0
2108 #define FF_AA_FASTINT 1 //not implemented yet
2110 #define FF_AA_FLOAT 3
2112 * quantizer noise shaping
2113 * - encoding: Set by user.
2114 * - decoding: unused
2116 int quantizer_noise_shaping;
2120 * is used to decide how many independent tasks should be passed to execute()
2121 * - encoding: Set by user.
2122 * - decoding: Set by user.
2127 * The codec may call this to execute several independent things.
2128 * It will return only after finishing all tasks.
2129 * The user may replace this with some multithreaded implementation,
2130 * the default implementation will execute the parts serially.
2131 * @param count the number of things to execute
2132 * - encoding: Set by libavcodec, user can override.
2133 * - decoding: Set by libavcodec, user can override.
2135 int (*execute)(struct AVCodecContext *c, int (*func)(struct AVCodecContext *c2, void *arg), void *arg2, int *ret, int count, int size);
2139 * Can be used by execute() to store some per AVCodecContext stuff.
2140 * - encoding: set by execute()
2141 * - decoding: set by execute()
2143 void *thread_opaque;
2146 * Motion estimation threshold below which no motion estimation is
2147 * performed, but instead the user specified motion vectors are used.
2149 * - encoding: Set by user.
2150 * - decoding: unused
2155 * Macroblock threshold below which the user specified macroblock types will be used.
2156 * - encoding: Set by user.
2157 * - decoding: unused
2162 * precision of the intra DC coefficient - 8
2163 * - encoding: Set by user.
2164 * - decoding: unused
2166 int intra_dc_precision;
2169 * noise vs. sse weight for the nsse comparsion function
2170 * - encoding: Set by user.
2171 * - decoding: unused
2176 * Number of macroblock rows at the top which are skipped.
2177 * - encoding: unused
2178 * - decoding: Set by user.
2183 * Number of macroblock rows at the bottom which are skipped.
2184 * - encoding: unused
2185 * - decoding: Set by user.
2191 * - encoding: Set by user.
2192 * - decoding: Set by libavcodec.
2195 #define FF_PROFILE_UNKNOWN -99
2197 #define FF_PROFILE_AAC_MAIN 0
2198 #define FF_PROFILE_AAC_LOW 1
2199 #define FF_PROFILE_AAC_SSR 2
2200 #define FF_PROFILE_AAC_LTP 3
2202 #define FF_PROFILE_H264_BASELINE 66
2203 #define FF_PROFILE_H264_MAIN 77
2204 #define FF_PROFILE_H264_EXTENDED 88
2205 #define FF_PROFILE_H264_HIGH 100
2206 #define FF_PROFILE_H264_HIGH_10 110
2207 #define FF_PROFILE_H264_HIGH_422 122
2208 #define FF_PROFILE_H264_HIGH_444 244
2209 #define FF_PROFILE_H264_CAVLC_444 44
2213 * - encoding: Set by user.
2214 * - decoding: Set by libavcodec.
2217 #define FF_LEVEL_UNKNOWN -99
2220 * low resolution decoding, 1-> 1/2 size, 2->1/4 size
2221 * - encoding: unused
2222 * - decoding: Set by user.
2227 * Bitstream width / height, may be different from width/height if lowres
2228 * or other things are used.
2229 * - encoding: unused
2230 * - decoding: Set by user before init if known. Codec should override / dynamically change if needed.
2232 int coded_width, coded_height;
2235 * frame skip threshold
2236 * - encoding: Set by user.
2237 * - decoding: unused
2239 int frame_skip_threshold;
2243 * - encoding: Set by user.
2244 * - decoding: unused
2246 int frame_skip_factor;
2249 * frame skip exponent
2250 * - encoding: Set by user.
2251 * - decoding: unused
2256 * frame skip comparison function
2257 * - encoding: Set by user.
2258 * - decoding: unused
2263 * Border processing masking, raises the quantizer for mbs on the borders
2265 * - encoding: Set by user.
2266 * - decoding: unused
2268 float border_masking;
2271 * minimum MB lagrange multipler
2272 * - encoding: Set by user.
2273 * - decoding: unused
2278 * maximum MB lagrange multipler
2279 * - encoding: Set by user.
2280 * - decoding: unused
2286 * - encoding: Set by user.
2287 * - decoding: unused
2289 int me_penalty_compensation;
2293 * - encoding: unused
2294 * - decoding: Set by user.
2296 enum AVDiscard skip_loop_filter;
2300 * - encoding: unused
2301 * - decoding: Set by user.
2303 enum AVDiscard skip_idct;
2307 * - encoding: unused
2308 * - decoding: Set by user.
2310 enum AVDiscard skip_frame;
2314 * - encoding: Set by user.
2315 * - decoding: unused
2321 * - encoding: Set by user.
2322 * - decoding: unused
2327 * constant rate factor - quality-based VBR - values ~correspond to qps
2328 * - encoding: Set by user.
2329 * - decoding: unused
2334 * constant quantization parameter rate control method
2335 * - encoding: Set by user.
2336 * - decoding: unused
2342 * - encoding: Set by user.
2343 * - decoding: unused
2348 * number of reference frames
2349 * - encoding: Set by user.
2350 * - decoding: Set by lavc.
2355 * chroma qp offset from luma
2356 * - encoding: Set by user.
2357 * - decoding: unused
2362 * Influences how often B-frames are used.
2363 * - encoding: Set by user.
2364 * - decoding: unused
2369 * trellis RD quantization
2370 * - encoding: Set by user.
2371 * - decoding: unused
2376 * Reduce fluctuations in qp (before curve compression).
2377 * - encoding: Set by user.
2378 * - decoding: unused
2380 float complexityblur;
2383 * in-loop deblocking filter alphac0 parameter
2384 * alpha is in the range -6...6
2385 * - encoding: Set by user.
2386 * - decoding: unused
2391 * in-loop deblocking filter beta parameter
2392 * beta is in the range -6...6
2393 * - encoding: Set by user.
2394 * - decoding: unused
2399 * macroblock subpartition sizes to consider - p8x8, p4x4, b8x8, i8x8, i4x4
2400 * - encoding: Set by user.
2401 * - decoding: unused
2404 #define X264_PART_I4X4 0x001 /* Analyze i4x4 */
2405 #define X264_PART_I8X8 0x002 /* Analyze i8x8 (requires 8x8 transform) */
2406 #define X264_PART_P8X8 0x010 /* Analyze p16x8, p8x16 and p8x8 */
2407 #define X264_PART_P4X4 0x020 /* Analyze p8x4, p4x8, p4x4 */
2408 #define X264_PART_B8X8 0x100 /* Analyze b16x8, b8x16 and b8x8 */
2411 * direct MV prediction mode - 0 (none), 1 (spatial), 2 (temporal), 3 (auto)
2412 * - encoding: Set by user.
2413 * - decoding: unused
2418 * Audio cutoff bandwidth (0 means "automatic")
2419 * - encoding: Set by user.
2420 * - decoding: unused
2425 * Multiplied by qscale for each frame and added to scene_change_score.
2426 * - encoding: Set by user.
2427 * - decoding: unused
2429 int scenechange_factor;
2433 * Note: Value depends upon the compare function used for fullpel ME.
2434 * - encoding: Set by user.
2435 * - decoding: unused
2440 * Adjusts sensitivity of b_frame_strategy 1.
2441 * - encoding: Set by user.
2442 * - decoding: unused
2447 * - encoding: Set by user.
2448 * - decoding: unused
2450 int compression_level;
2451 #define FF_COMPRESSION_DEFAULT -1
2453 #if LIBAVCODEC_VERSION_MAJOR < 53
2455 * Sets whether to use LPC mode - used by FLAC encoder.
2456 * - encoding: Set by user.
2457 * - decoding: unused
2458 * @deprecated Deprecated in favor of lpc_type and lpc_passes.
2464 * LPC coefficient precision - used by FLAC encoder
2465 * - encoding: Set by user.
2466 * - decoding: unused
2468 int lpc_coeff_precision;
2471 * - encoding: Set by user.
2472 * - decoding: unused
2474 int min_prediction_order;
2477 * - encoding: Set by user.
2478 * - decoding: unused
2480 int max_prediction_order;
2483 * search method for selecting prediction order
2484 * - encoding: Set by user.
2485 * - decoding: unused
2487 int prediction_order_method;
2490 * - encoding: Set by user.
2491 * - decoding: unused
2493 int min_partition_order;
2496 * - encoding: Set by user.
2497 * - decoding: unused
2499 int max_partition_order;
2502 * GOP timecode frame start number, in non drop frame format
2503 * - encoding: Set by user.
2504 * - decoding: unused
2506 int64_t timecode_frame_start;
2508 #if LIBAVCODEC_VERSION_MAJOR < 53
2510 * Decoder should decode to this many channels if it can (0 for default)
2511 * - encoding: unused
2512 * - decoding: Set by user.
2513 * @deprecated Deprecated in favor of request_channel_layout.
2515 int request_channels;
2519 * Percentage of dynamic range compression to be applied by the decoder.
2520 * The default value is 1.0, corresponding to full compression.
2521 * - encoding: unused
2522 * - decoding: Set by user.
2527 * opaque 64bit number (generally a PTS) that will be reordered and
2528 * output in AVFrame.reordered_opaque
2529 * - encoding: unused
2530 * - decoding: Set by user.
2532 int64_t reordered_opaque;
2535 * Bits per sample/pixel of internal libavcodec pixel/sample format.
2536 * This field is applicable only when sample_fmt is SAMPLE_FMT_S32.
2537 * - encoding: set by user.
2538 * - decoding: set by libavcodec.
2540 int bits_per_raw_sample;
2543 * Audio channel layout.
2544 * - encoding: set by user.
2545 * - decoding: set by libavcodec.
2547 int64_t channel_layout;
2550 * Request decoder to use this channel layout if it can (0 for default)
2551 * - encoding: unused
2552 * - decoding: Set by user.
2554 int64_t request_channel_layout;
2557 * Ratecontrol attempt to use, at maximum, <value> of what can be used without an underflow.
2558 * - encoding: Set by user.
2559 * - decoding: unused.
2561 float rc_max_available_vbv_use;
2564 * Ratecontrol attempt to use, at least, <value> times the amount needed to prevent a vbv overflow.
2565 * - encoding: Set by user.
2566 * - decoding: unused.
2568 float rc_min_vbv_overflow_use;
2571 * Hardware accelerator in use
2572 * - encoding: unused.
2573 * - decoding: Set by libavcodec
2575 struct AVHWAccel *hwaccel;
2578 * For some codecs, the time base is closer to the field rate than the frame rate.
2579 * Most notably, H.264 and MPEG-2 specify time_base as half of frame duration
2580 * if no telecine is used ...
2582 * Set to time_base ticks per frame. Default 1, e.g., H.264/MPEG-2 set it to 2.
2584 int ticks_per_frame;
2587 * Hardware accelerator context.
2588 * For some hardware accelerators, a global context needs to be
2589 * provided by the user. In that case, this holds display-dependent
2590 * data FFmpeg cannot instantiate itself. Please refer to the
2591 * FFmpeg HW accelerator documentation to know how to fill this
2592 * is. e.g. for VA API, this is a struct vaapi_context.
2593 * - encoding: unused
2594 * - decoding: Set by user
2596 void *hwaccel_context;
2599 * Chromaticity coordinates of the source primaries.
2600 * - encoding: Set by user
2601 * - decoding: Set by libavcodec
2603 enum AVColorPrimaries color_primaries;
2606 * Color Transfer Characteristic.
2607 * - encoding: Set by user
2608 * - decoding: Set by libavcodec
2610 enum AVColorTransferCharacteristic color_trc;
2613 * YUV colorspace type.
2614 * - encoding: Set by user
2615 * - decoding: Set by libavcodec
2617 enum AVColorSpace colorspace;
2620 * MPEG vs JPEG YUV range.
2621 * - encoding: Set by user
2622 * - decoding: Set by libavcodec
2624 enum AVColorRange color_range;
2627 * This defines the location of chroma samples.
2628 * - encoding: Set by user
2629 * - decoding: Set by libavcodec
2631 enum AVChromaLocation chroma_sample_location;
2634 * The codec may call this to execute several independent things.
2635 * It will return only after finishing all tasks.
2636 * The user may replace this with some multithreaded implementation,
2637 * the default implementation will execute the parts serially.
2638 * Also see avcodec_thread_init and e.g. the --enable-pthread configure option.
2639 * @param c context passed also to func
2640 * @param count the number of things to execute
2641 * @param arg2 argument passed unchanged to func
2642 * @param ret return values of executed functions, must have space for "count" values. May be NULL.
2643 * @param func function that will be called count times, with jobnr from 0 to count-1.
2644 * threadnr will be in the range 0 to c->thread_count-1 < MAX_THREADS and so that no
2645 * two instances of func executing at the same time will have the same threadnr.
2646 * @return always 0 currently, but code should handle a future improvement where when any call to func
2647 * returns < 0 no further calls to func may be done and < 0 is returned.
2648 * - encoding: Set by libavcodec, user can override.
2649 * - decoding: Set by libavcodec, user can override.
2651 int (*execute2)(struct AVCodecContext *c, int (*func)(struct AVCodecContext *c2, void *arg, int jobnr, int threadnr), void *arg2, int *ret, int count);
2654 * explicit P-frame weighted prediction analysis method
2656 * 1: fast blind weighting (one reference duplicate with -1 offset)
2657 * 2: smart weighting (full fade detection analysis)
2658 * - encoding: Set by user.
2659 * - decoding: unused
2661 int weighted_p_pred;
2666 * 1: Variance AQ (complexity mask)
2667 * 2: Auto-variance AQ (experimental)
2668 * - encoding: Set by user
2669 * - decoding: unused
2675 * Reduces blocking and blurring in flat and textured areas.
2676 * - encoding: Set by user
2677 * - decoding: unused
2683 * Strength of psychovisual optimization
2684 * - encoding: Set by user
2685 * - decoding: unused
2691 * Strength of psychovisual optimization
2692 * - encoding: Set by user
2693 * - decoding: unused
2699 * Number of frames for frametype and ratecontrol lookahead
2700 * - encoding: Set by user
2701 * - decoding: unused
2706 * Constant rate factor maximum
2707 * With CRF encoding mode and VBV restrictions enabled, prevents quality from being worse
2708 * than crf_max, even if doing so would violate VBV restrictions.
2709 * - encoding: Set by user.
2710 * - decoding: unused
2714 int log_level_offset;
2717 * Determines which LPC analysis algorithm to use.
2718 * - encoding: Set by user
2719 * - decoding: unused
2721 enum AVLPCType lpc_type;
2724 * Number of passes to use for Cholesky factorization during LPC analysis
2725 * - encoding: Set by user
2726 * - decoding: unused
2734 typedef struct AVCodec {
2736 * Name of the codec implementation.
2737 * The name is globally unique among encoders and among decoders (but an
2738 * encoder and a decoder can share the same name).
2739 * This is the primary way to find a codec from the user perspective.
2742 enum AVMediaType type;
2745 int (*init)(AVCodecContext *);
2746 int (*encode)(AVCodecContext *, uint8_t *buf, int buf_size, void *data);
2747 int (*close)(AVCodecContext *);
2748 int (*decode)(AVCodecContext *, void *outdata, int *outdata_size, AVPacket *avpkt);
2750 * Codec capabilities.
2754 struct AVCodec *next;
2757 * Will be called when seeking
2759 void (*flush)(AVCodecContext *);
2760 const AVRational *supported_framerates; ///< array of supported framerates, or NULL if any, array is terminated by {0,0}
2761 const enum PixelFormat *pix_fmts; ///< array of supported pixel formats, or NULL if unknown, array is terminated by -1
2763 * Descriptive name for the codec, meant to be more human readable than name.
2764 * You should use the NULL_IF_CONFIG_SMALL() macro to define it.
2766 const char *long_name;
2767 const int *supported_samplerates; ///< array of supported audio samplerates, or NULL if unknown, array is terminated by 0
2768 const enum SampleFormat *sample_fmts; ///< array of supported sample formats, or NULL if unknown, array is terminated by -1
2769 const int64_t *channel_layouts; ///< array of support channel layouts, or NULL if unknown. array is terminated by 0
2770 uint8_t max_lowres; ///< maximum value for lowres supported by the decoder
2771 AVClass *priv_class; ///< AVClass for the private context
2777 typedef struct AVHWAccel {
2779 * Name of the hardware accelerated codec.
2780 * The name is globally unique among encoders and among decoders (but an
2781 * encoder and a decoder can share the same name).
2786 * Type of codec implemented by the hardware accelerator.
2788 * See AVMEDIA_TYPE_xxx
2790 enum AVMediaType type;
2793 * Codec implemented by the hardware accelerator.
2800 * Supported pixel format.
2802 * Only hardware accelerated formats are supported here.
2804 enum PixelFormat pix_fmt;
2807 * Hardware accelerated codec capabilities.
2808 * see FF_HWACCEL_CODEC_CAP_*
2812 struct AVHWAccel *next;
2815 * Called at the beginning of each frame or field picture.
2817 * Meaningful frame information (codec specific) is guaranteed to
2818 * be parsed at this point. This function is mandatory.
2820 * Note that buf can be NULL along with buf_size set to 0.
2821 * Otherwise, this means the whole frame is available at this point.
2823 * @param avctx the codec context
2824 * @param buf the frame data buffer base
2825 * @param buf_size the size of the frame in bytes
2826 * @return zero if successful, a negative value otherwise
2828 int (*start_frame)(AVCodecContext *avctx, const uint8_t *buf, uint32_t buf_size);
2831 * Callback for each slice.
2833 * Meaningful slice information (codec specific) is guaranteed to
2834 * be parsed at this point. This function is mandatory.
2836 * @param avctx the codec context
2837 * @param buf the slice data buffer base
2838 * @param buf_size the size of the slice in bytes
2839 * @return zero if successful, a negative value otherwise
2841 int (*decode_slice)(AVCodecContext *avctx, const uint8_t *buf, uint32_t buf_size);
2844 * Called at the end of each frame or field picture.
2846 * The whole picture is parsed at this point and can now be sent
2847 * to the hardware accelerator. This function is mandatory.
2849 * @param avctx the codec context
2850 * @return zero if successful, a negative value otherwise
2852 int (*end_frame)(AVCodecContext *avctx);
2855 * Size of HW accelerator private data.
2857 * Private data is allocated with av_mallocz() before
2858 * AVCodecContext.get_buffer() and deallocated after
2859 * AVCodecContext.release_buffer().
2865 * four components are given, that's all.
2866 * the last component is alpha
2868 typedef struct AVPicture {
2870 int linesize[4]; ///< number of bytes per line
2873 #if FF_API_PALETTE_CONTROL
2876 * This structure defines a method for communicating palette changes
2877 * between and demuxer and a decoder.
2879 * @deprecated Use AVPacket to send palette changes instead.
2880 * This is totally broken.
2882 #define AVPALETTE_SIZE 1024
2883 #define AVPALETTE_COUNT 256
2884 typedef struct AVPaletteControl {
2886 /* Demuxer sets this to 1 to indicate the palette has changed;
2887 * decoder resets to 0. */
2888 int palette_changed;
2890 /* 4-byte ARGB palette entries, stored in native byte order; note that
2891 * the individual palette components should be on a 8-bit scale; if
2892 * the palette data comes from an IBM VGA native format, the component
2893 * data is probably 6 bits in size and needs to be scaled. */
2894 unsigned int palette[AVPALETTE_COUNT];
2896 } AVPaletteControl attribute_deprecated;
2899 enum AVSubtitleType {
2902 SUBTITLE_BITMAP, ///< A bitmap, pict will be set
2905 * Plain text, the text field must be set by the decoder and is
2906 * authoritative. ass and pict fields may contain approximations.
2911 * Formatted text, the ass field must be set by the decoder and is
2912 * authoritative. pict and text fields may contain approximations.
2917 typedef struct AVSubtitleRect {
2918 int x; ///< top left corner of pict, undefined when pict is not set
2919 int y; ///< top left corner of pict, undefined when pict is not set
2920 int w; ///< width of pict, undefined when pict is not set
2921 int h; ///< height of pict, undefined when pict is not set
2922 int nb_colors; ///< number of colors in pict, undefined when pict is not set
2925 * data+linesize for the bitmap of this subtitle.
2926 * can be set for text/ass as well once they where rendered
2929 enum AVSubtitleType type;
2931 char *text; ///< 0 terminated plain UTF-8 text
2934 * 0 terminated ASS/SSA compatible event line.
2935 * The pressentation of this is unaffected by the other values in this
2941 typedef struct AVSubtitle {
2942 uint16_t format; /* 0 = graphics */
2943 uint32_t start_display_time; /* relative to packet pts, in ms */
2944 uint32_t end_display_time; /* relative to packet pts, in ms */
2946 AVSubtitleRect **rects;
2947 int64_t pts; ///< Same as packet pts, in AV_TIME_BASE
2950 /* packet functions */
2953 * @deprecated use NULL instead
2955 attribute_deprecated void av_destruct_packet_nofree(AVPacket *pkt);
2958 * Default packet destructor.
2960 void av_destruct_packet(AVPacket *pkt);
2963 * Initialize optional fields of a packet with default values.
2967 void av_init_packet(AVPacket *pkt);
2970 * Allocate the payload of a packet and initialize its fields with
2974 * @param size wanted payload size
2975 * @return 0 if OK, AVERROR_xxx otherwise
2977 int av_new_packet(AVPacket *pkt, int size);
2980 * Reduce packet size, correctly zeroing padding
2983 * @param size new size
2985 void av_shrink_packet(AVPacket *pkt, int size);
2988 * @warning This is a hack - the packet memory allocation stuff is broken. The
2989 * packet is allocated if it was not really allocated.
2991 int av_dup_packet(AVPacket *pkt);
2996 * @param pkt packet to free
2998 void av_free_packet(AVPacket *pkt);
3002 struct ReSampleContext;
3003 struct AVResampleContext;
3005 typedef struct ReSampleContext ReSampleContext;
3007 #if FF_API_AUDIO_OLD
3009 * @deprecated Use av_audio_resample_init() instead.
3011 attribute_deprecated ReSampleContext *audio_resample_init(int output_channels, int input_channels,
3012 int output_rate, int input_rate);
3015 * Initialize audio resampling context
3017 * @param output_channels number of output channels
3018 * @param input_channels number of input channels
3019 * @param output_rate output sample rate
3020 * @param input_rate input sample rate
3021 * @param sample_fmt_out requested output sample format
3022 * @param sample_fmt_in input sample format
3023 * @param filter_length length of each FIR filter in the filterbank relative to the cutoff freq
3024 * @param log2_phase_count log2 of the number of entries in the polyphase filterbank
3025 * @param linear If 1 then the used FIR filter will be linearly interpolated
3026 between the 2 closest, if 0 the closest will be used
3027 * @param cutoff cutoff frequency, 1.0 corresponds to half the output sampling rate
3028 * @return allocated ReSampleContext, NULL if error occured
3030 ReSampleContext *av_audio_resample_init(int output_channels, int input_channels,
3031 int output_rate, int input_rate,
3032 enum SampleFormat sample_fmt_out,
3033 enum SampleFormat sample_fmt_in,
3034 int filter_length, int log2_phase_count,
3035 int linear, double cutoff);
3037 int audio_resample(ReSampleContext *s, short *output, short *input, int nb_samples);
3038 void audio_resample_close(ReSampleContext *s);
3042 * Initialize an audio resampler.
3043 * Note, if either rate is not an integer then simply scale both rates up so they are.
3044 * @param filter_length length of each FIR filter in the filterbank relative to the cutoff freq
3045 * @param log2_phase_count log2 of the number of entries in the polyphase filterbank
3046 * @param linear If 1 then the used FIR filter will be linearly interpolated
3047 between the 2 closest, if 0 the closest will be used
3048 * @param cutoff cutoff frequency, 1.0 corresponds to half the output sampling rate
3050 struct AVResampleContext *av_resample_init(int out_rate, int in_rate, int filter_length, int log2_phase_count, int linear, double cutoff);
3053 * Resample an array of samples using a previously configured context.
3054 * @param src an array of unconsumed samples
3055 * @param consumed the number of samples of src which have been consumed are returned here
3056 * @param src_size the number of unconsumed samples available
3057 * @param dst_size the amount of space in samples available in dst
3058 * @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.
3059 * @return the number of samples written in dst or -1 if an error occurred
3061 int av_resample(struct AVResampleContext *c, short *dst, short *src, int *consumed, int src_size, int dst_size, int update_ctx);
3065 * Compensate samplerate/timestamp drift. The compensation is done by changing
3066 * the resampler parameters, so no audible clicks or similar distortions occur
3067 * @param compensation_distance distance in output samples over which the compensation should be performed
3068 * @param sample_delta number of output samples which should be output less
3070 * example: av_resample_compensate(c, 10, 500)
3071 * here instead of 510 samples only 500 samples would be output
3073 * note, due to rounding the actual compensation might be slightly different,
3074 * especially if the compensation_distance is large and the in_rate used during init is small
3076 void av_resample_compensate(struct AVResampleContext *c, int sample_delta, int compensation_distance);
3077 void av_resample_close(struct AVResampleContext *c);
3080 * Allocate memory for a picture. Call avpicture_free to free it.
3082 * @param picture the picture to be filled in
3083 * @param pix_fmt the format of the picture
3084 * @param width the width of the picture
3085 * @param height the height of the picture
3086 * @return zero if successful, a negative value if not
3088 int avpicture_alloc(AVPicture *picture, enum PixelFormat pix_fmt, int width, int height);
3091 * Free a picture previously allocated by avpicture_alloc().
3093 * @param picture the AVPicture to be freed
3095 void avpicture_free(AVPicture *picture);
3098 * Fill in the AVPicture fields.
3099 * The fields of the given AVPicture are filled in by using the 'ptr' address
3100 * which points to the image data buffer. Depending on the specified picture
3101 * format, one or multiple image data pointers and line sizes will be set.
3102 * If a planar format is specified, several pointers will be set pointing to
3103 * the different picture planes and the line sizes of the different planes
3104 * will be stored in the lines_sizes array.
3105 * Call with ptr == NULL to get the required size for the ptr buffer.
3107 * @param picture AVPicture whose fields are to be filled in
3108 * @param ptr Buffer which will contain or contains the actual image data
3109 * @param pix_fmt The format in which the picture data is stored.
3110 * @param width the width of the image in pixels
3111 * @param height the height of the image in pixels
3112 * @return size of the image data in bytes
3114 int avpicture_fill(AVPicture *picture, uint8_t *ptr,
3115 enum PixelFormat pix_fmt, int width, int height);
3116 int avpicture_layout(const AVPicture* src, enum PixelFormat pix_fmt, int width, int height,
3117 unsigned char *dest, int dest_size);
3120 * Calculate the size in bytes that a picture of the given width and height
3121 * would occupy if stored in the given picture format.
3122 * Note that this returns the size of a compact representation as generated
3123 * by avpicture_layout, which can be smaller than the size required for e.g.
3126 * @param pix_fmt the given picture format
3127 * @param width the width of the image
3128 * @param height the height of the image
3129 * @return Image data size in bytes or -1 on error (e.g. too large dimensions).
3131 int avpicture_get_size(enum PixelFormat pix_fmt, int width, int height);
3132 void avcodec_get_chroma_sub_sample(enum PixelFormat pix_fmt, int *h_shift, int *v_shift);
3133 const char *avcodec_get_pix_fmt_name(enum PixelFormat pix_fmt);
3134 void avcodec_set_dimensions(AVCodecContext *s, int width, int height);
3136 #if LIBAVCODEC_VERSION_MAJOR < 53
3138 * Return the pixel format corresponding to the name name.
3140 * If there is no pixel format with name name, then look for a
3141 * pixel format with the name corresponding to the native endian
3143 * For example in a little-endian system, first look for "gray16",
3144 * then for "gray16le".
3146 * Finally if no pixel format has been found, return PIX_FMT_NONE.
3148 * @deprecated Deprecated in favor of av_get_pix_fmt().
3150 attribute_deprecated enum PixelFormat avcodec_get_pix_fmt(const char* name);
3154 * Return a value representing the fourCC code associated to the
3155 * pixel format pix_fmt, or 0 if no associated fourCC code can be
3158 unsigned int avcodec_pix_fmt_to_codec_tag(enum PixelFormat pix_fmt);
3161 * Put a string representing the codec tag codec_tag in buf.
3163 * @param buf_size size in bytes of buf
3164 * @return the length of the string that would have been generated if
3165 * enough space had been available, excluding the trailing null
3167 size_t av_get_codec_tag_string(char *buf, size_t buf_size, unsigned int codec_tag);
3169 #define FF_LOSS_RESOLUTION 0x0001 /**< loss due to resolution change */
3170 #define FF_LOSS_DEPTH 0x0002 /**< loss due to color depth change */
3171 #define FF_LOSS_COLORSPACE 0x0004 /**< loss due to color space conversion */
3172 #define FF_LOSS_ALPHA 0x0008 /**< loss of alpha bits */
3173 #define FF_LOSS_COLORQUANT 0x0010 /**< loss due to color quantization */
3174 #define FF_LOSS_CHROMA 0x0020 /**< loss of chroma (e.g. RGB to gray conversion) */
3177 * Compute what kind of losses will occur when converting from one specific
3178 * pixel format to another.
3179 * When converting from one pixel format to another, information loss may occur.
3180 * For example, when converting from RGB24 to GRAY, the color information will
3181 * be lost. Similarly, other losses occur when converting from some formats to
3182 * other formats. These losses can involve loss of chroma, but also loss of
3183 * resolution, loss of color depth, loss due to the color space conversion, loss
3184 * of the alpha bits or loss due to color quantization.
3185 * avcodec_get_fix_fmt_loss() informs you about the various types of losses
3186 * which will occur when converting from one pixel format to another.
3188 * @param[in] dst_pix_fmt destination pixel format
3189 * @param[in] src_pix_fmt source pixel format
3190 * @param[in] has_alpha Whether the source pixel format alpha channel is used.
3191 * @return Combination of flags informing you what kind of losses will occur.
3193 int avcodec_get_pix_fmt_loss(enum PixelFormat dst_pix_fmt, enum PixelFormat src_pix_fmt,
3197 * Find the best pixel format to convert to given a certain source pixel
3198 * format. When converting from one pixel format to another, information loss
3199 * may occur. For example, when converting from RGB24 to GRAY, the color
3200 * information will be lost. Similarly, other losses occur when converting from
3201 * some formats to other formats. avcodec_find_best_pix_fmt() searches which of
3202 * the given pixel formats should be used to suffer the least amount of loss.
3203 * The pixel formats from which it chooses one, are determined by the
3204 * pix_fmt_mask parameter.
3207 * src_pix_fmt = PIX_FMT_YUV420P;
3208 * pix_fmt_mask = (1 << PIX_FMT_YUV422P) || (1 << PIX_FMT_RGB24);
3209 * dst_pix_fmt = avcodec_find_best_pix_fmt(pix_fmt_mask, src_pix_fmt, alpha, &loss);
3212 * @param[in] pix_fmt_mask bitmask determining which pixel format to choose from
3213 * @param[in] src_pix_fmt source pixel format
3214 * @param[in] has_alpha Whether the source pixel format alpha channel is used.
3215 * @param[out] loss_ptr Combination of flags informing you what kind of losses will occur.
3216 * @return The best pixel format to convert to or -1 if none was found.
3218 enum PixelFormat avcodec_find_best_pix_fmt(int64_t pix_fmt_mask, enum PixelFormat src_pix_fmt,
3219 int has_alpha, int *loss_ptr);
3223 * Print in buf the string corresponding to the pixel format with
3224 * number pix_fmt, or an header if pix_fmt is negative.
3226 * @param[in] buf the buffer where to write the string
3227 * @param[in] buf_size the size of buf
3228 * @param[in] pix_fmt the number of the pixel format to print the corresponding info string, or
3229 * a negative value to print the corresponding header.
3230 * Meaningful values for obtaining a pixel format info vary from 0 to PIX_FMT_NB -1.
3232 void avcodec_pix_fmt_string (char *buf, int buf_size, enum PixelFormat pix_fmt);
3234 #define FF_ALPHA_TRANSP 0x0001 /* image has some totally transparent pixels */
3235 #define FF_ALPHA_SEMI_TRANSP 0x0002 /* image has some transparent pixels */
3238 * Tell if an image really has transparent alpha values.
3239 * @return ored mask of FF_ALPHA_xxx constants
3241 int img_get_alpha_info(const AVPicture *src,
3242 enum PixelFormat pix_fmt, int width, int height);
3244 /* deinterlace a picture */
3245 /* deinterlace - if not supported return -1 */
3246 int avpicture_deinterlace(AVPicture *dst, const AVPicture *src,
3247 enum PixelFormat pix_fmt, int width, int height);
3249 /* external high level API */
3252 * If c is NULL, returns the first registered codec,
3253 * if c is non-NULL, returns the next registered codec after c,
3254 * or NULL if c is the last one.
3256 AVCodec *av_codec_next(AVCodec *c);
3259 * Return the LIBAVCODEC_VERSION_INT constant.
3261 unsigned avcodec_version(void);
3264 * Return the libavcodec build-time configuration.
3266 const char *avcodec_configuration(void);
3269 * Return the libavcodec license.
3271 const char *avcodec_license(void);
3274 * Initialize libavcodec.
3276 * @warning This function must be called before any other libavcodec
3279 void avcodec_init(void);
3281 #if LIBAVCODEC_VERSION_MAJOR < 53
3283 * @deprecated Deprecated in favor of avcodec_register().
3285 attribute_deprecated void register_avcodec(AVCodec *codec);
3289 * Register the codec codec and initialize libavcodec.
3291 * @see avcodec_init()
3293 void avcodec_register(AVCodec *codec);
3296 * Find a registered encoder with a matching codec ID.
3298 * @param id CodecID of the requested encoder
3299 * @return An encoder if one was found, NULL otherwise.
3301 AVCodec *avcodec_find_encoder(enum CodecID id);
3304 * Find a registered encoder with the specified name.
3306 * @param name name of the requested encoder
3307 * @return An encoder if one was found, NULL otherwise.
3309 AVCodec *avcodec_find_encoder_by_name(const char *name);
3312 * Find a registered decoder with a matching codec ID.
3314 * @param id CodecID of the requested decoder
3315 * @return A decoder if one was found, NULL otherwise.
3317 AVCodec *avcodec_find_decoder(enum CodecID id);
3320 * Find a registered decoder with the specified name.
3322 * @param name name of the requested decoder
3323 * @return A decoder if one was found, NULL otherwise.
3325 AVCodec *avcodec_find_decoder_by_name(const char *name);
3326 void avcodec_string(char *buf, int buf_size, AVCodecContext *enc, int encode);
3329 * Set the fields of the given AVCodecContext to default values.
3331 * @param s The AVCodecContext of which the fields should be set to default values.
3333 void avcodec_get_context_defaults(AVCodecContext *s);
3335 /** THIS FUNCTION IS NOT YET PART OF THE PUBLIC API!
3336 * we WILL change its arguments and name a few times! */
3337 void avcodec_get_context_defaults2(AVCodecContext *s, enum AVMediaType);
3339 /** THIS FUNCTION IS NOT YET PART OF THE PUBLIC API!
3340 * we WILL change its arguments and name a few times! */
3341 int avcodec_get_context_defaults3(AVCodecContext *s, AVCodec *codec);
3344 * Allocate an AVCodecContext and set its fields to default values. The
3345 * resulting struct can be deallocated by simply calling av_free().
3347 * @return An AVCodecContext filled with default values or NULL on failure.
3348 * @see avcodec_get_context_defaults
3350 AVCodecContext *avcodec_alloc_context(void);
3352 /** THIS FUNCTION IS NOT YET PART OF THE PUBLIC API!
3353 * we WILL change its arguments and name a few times! */
3354 AVCodecContext *avcodec_alloc_context2(enum AVMediaType);
3356 /** THIS FUNCTION IS NOT YET PART OF THE PUBLIC API!
3357 * we WILL change its arguments and name a few times! */
3358 AVCodecContext *avcodec_alloc_context3(AVCodec *codec);
3361 * Copy the settings of the source AVCodecContext into the destination
3362 * AVCodecContext. The resulting destination codec context will be
3363 * unopened, i.e. you are required to call avcodec_open() before you
3364 * can use this AVCodecContext to decode/encode video/audio data.
3366 * @param dest target codec context, should be initialized with
3367 * avcodec_alloc_context(), but otherwise uninitialized
3368 * @param src source codec context
3369 * @return AVERROR() on error (e.g. memory allocation error), 0 on success
3371 int avcodec_copy_context(AVCodecContext *dest, const AVCodecContext *src);
3374 * Set the fields of the given AVFrame to default values.
3376 * @param pic The AVFrame of which the fields should be set to default values.
3378 void avcodec_get_frame_defaults(AVFrame *pic);
3381 * Allocate an AVFrame and set its fields to default values. The resulting
3382 * struct can be deallocated by simply calling av_free().
3384 * @return An AVFrame filled with default values or NULL on failure.
3385 * @see avcodec_get_frame_defaults
3387 AVFrame *avcodec_alloc_frame(void);
3389 int avcodec_default_get_buffer(AVCodecContext *s, AVFrame *pic);
3390 void avcodec_default_release_buffer(AVCodecContext *s, AVFrame *pic);
3391 int avcodec_default_reget_buffer(AVCodecContext *s, AVFrame *pic);
3394 * Return the amount of padding in pixels which the get_buffer callback must
3395 * provide around the edge of the image for codecs which do not have the
3396 * CODEC_FLAG_EMU_EDGE flag.
3398 * @return Required padding in pixels.
3400 unsigned avcodec_get_edge_width(void);
3402 * Modify width and height values so that they will result in a memory
3403 * buffer that is acceptable for the codec if you do not use any horizontal
3406 * May only be used if a codec with CODEC_CAP_DR1 has been opened.
3407 * If CODEC_FLAG_EMU_EDGE is not set, the dimensions must have been increased
3408 * according to avcodec_get_edge_width() before.
3410 void avcodec_align_dimensions(AVCodecContext *s, int *width, int *height);
3412 * Modify width and height values so that they will result in a memory
3413 * buffer that is acceptable for the codec if you also ensure that all
3414 * line sizes are a multiple of the respective linesize_align[i].
3416 * May only be used if a codec with CODEC_CAP_DR1 has been opened.
3417 * If CODEC_FLAG_EMU_EDGE is not set, the dimensions must have been increased
3418 * according to avcodec_get_edge_width() before.
3420 void avcodec_align_dimensions2(AVCodecContext *s, int *width, int *height,
3421 int linesize_align[4]);
3423 #if LIBAVCODEC_VERSION_MAJOR < 53
3425 * @deprecated Deprecated in favor of av_check_image_size().
3427 attribute_deprecated
3428 int avcodec_check_dimensions(void *av_log_ctx, unsigned int w, unsigned int h);
3431 enum PixelFormat avcodec_default_get_format(struct AVCodecContext *s, const enum PixelFormat * fmt);
3433 int avcodec_thread_init(AVCodecContext *s, int thread_count);
3434 void avcodec_thread_free(AVCodecContext *s);
3435 int avcodec_default_execute(AVCodecContext *c, int (*func)(AVCodecContext *c2, void *arg2),void *arg, int *ret, int count, int size);
3436 int avcodec_default_execute2(AVCodecContext *c, int (*func)(AVCodecContext *c2, void *arg2, int, int),void *arg, int *ret, int count);
3437 //FIXME func typedef
3440 * Initialize the AVCodecContext to use the given AVCodec. Prior to using this
3441 * function the context has to be allocated.
3443 * The functions avcodec_find_decoder_by_name(), avcodec_find_encoder_by_name(),
3444 * avcodec_find_decoder() and avcodec_find_encoder() provide an easy way for
3445 * retrieving a codec.
3447 * @warning This function is not thread safe!
3450 * avcodec_register_all();
3451 * codec = avcodec_find_decoder(CODEC_ID_H264);
3455 * context = avcodec_alloc_context();
3457 * if (avcodec_open(context, codec) < 0)
3461 * @param avctx The context which will be set up to use the given codec.
3462 * @param codec The codec to use within the context.
3463 * @return zero on success, a negative value on error
3464 * @see avcodec_alloc_context, avcodec_find_decoder, avcodec_find_encoder
3466 int avcodec_open(AVCodecContext *avctx, AVCodec *codec);
3468 #if FF_API_AUDIO_OLD
3470 * Decode an audio frame from buf into samples.
3471 * Wrapper function which calls avcodec_decode_audio3.
3473 * @deprecated Use avcodec_decode_audio3 instead.
3474 * @param avctx the codec context
3475 * @param[out] samples the output buffer
3476 * @param[in,out] frame_size_ptr the output buffer size in bytes
3477 * @param[in] buf the input buffer
3478 * @param[in] buf_size the input buffer size in bytes
3479 * @return On error a negative value is returned, otherwise the number of bytes
3480 * used or zero if no frame could be decompressed.
3482 attribute_deprecated int avcodec_decode_audio2(AVCodecContext *avctx, int16_t *samples,
3483 int *frame_size_ptr,
3484 const uint8_t *buf, int buf_size);
3488 * Decode the audio frame of size avpkt->size from avpkt->data into samples.
3489 * Some decoders may support multiple frames in a single AVPacket, such
3490 * decoders would then just decode the first frame. In this case,
3491 * avcodec_decode_audio3 has to be called again with an AVPacket that contains
3492 * the remaining data in order to decode the second frame etc.
3494 * could be outputted, frame_size_ptr is zero. Otherwise, it is the
3495 * decompressed frame size in bytes.
3497 * @warning You must set frame_size_ptr to the allocated size of the
3498 * output buffer before calling avcodec_decode_audio3().
3500 * @warning The input buffer must be FF_INPUT_BUFFER_PADDING_SIZE larger than
3501 * the actual read bytes because some optimized bitstream readers read 32 or 64
3502 * bits at once and could read over the end.
3504 * @warning The end of the input buffer avpkt->data should be set to 0 to ensure that
3505 * no overreading happens for damaged MPEG streams.
3507 * @note You might have to align the input buffer avpkt->data and output buffer
3508 * samples. The alignment requirements depend on the CPU: On some CPUs it isn't
3509 * necessary at all, on others it won't work at all if not aligned and on others
3510 * it will work but it will have an impact on performance.
3512 * In practice, avpkt->data should have 4 byte alignment at minimum and
3513 * samples should be 16 byte aligned unless the CPU doesn't need it
3514 * (AltiVec and SSE do).
3516 * @param avctx the codec context
3517 * @param[out] samples the output buffer, sample type in avctx->sample_fmt
3518 * @param[in,out] frame_size_ptr the output buffer size in bytes
3519 * @param[in] avpkt The input AVPacket containing the input buffer.
3520 * You can create such packet with av_init_packet() and by then setting
3521 * data and size, some decoders might in addition need other fields.
3522 * All decoders are designed to use the least fields possible though.
3523 * @return On error a negative value is returned, otherwise the number of bytes
3524 * used or zero if no frame data was decompressed (used) from the input AVPacket.
3526 int avcodec_decode_audio3(AVCodecContext *avctx, int16_t *samples,
3527 int *frame_size_ptr,
3530 #if FF_API_VIDEO_OLD
3532 * Decode a video frame from buf into picture.
3533 * Wrapper function which calls avcodec_decode_video2.
3535 * @deprecated Use avcodec_decode_video2 instead.
3536 * @param avctx the codec context
3537 * @param[out] picture The AVFrame in which the decoded video frame will be stored.
3538 * @param[in] buf the input buffer
3539 * @param[in] buf_size the size of the input buffer in bytes
3540 * @param[in,out] got_picture_ptr Zero if no frame could be decompressed, otherwise, it is nonzero.
3541 * @return On error a negative value is returned, otherwise the number of bytes
3542 * used or zero if no frame could be decompressed.
3544 attribute_deprecated int avcodec_decode_video(AVCodecContext *avctx, AVFrame *picture,
3545 int *got_picture_ptr,
3546 const uint8_t *buf, int buf_size);
3550 * Decode the video frame of size avpkt->size from avpkt->data into picture.
3551 * Some decoders may support multiple frames in a single AVPacket, such
3552 * decoders would then just decode the first frame.
3554 * @warning The input buffer must be FF_INPUT_BUFFER_PADDING_SIZE larger than
3555 * the actual read bytes because some optimized bitstream readers read 32 or 64
3556 * bits at once and could read over the end.
3558 * @warning The end of the input buffer buf should be set to 0 to ensure that
3559 * no overreading happens for damaged MPEG streams.
3561 * @note You might have to align the input buffer avpkt->data.
3562 * The alignment requirements depend on the CPU: on some CPUs it isn't
3563 * necessary at all, on others it won't work at all if not aligned and on others
3564 * it will work but it will have an impact on performance.
3566 * In practice, avpkt->data should have 4 byte alignment at minimum.
3568 * @note Some codecs have a delay between input and output, these need to be
3569 * fed with avpkt->data=NULL, avpkt->size=0 at the end to return the remaining frames.
3571 * @param avctx the codec context
3572 * @param[out] picture The AVFrame in which the decoded video frame will be stored.
3573 * Use avcodec_alloc_frame to get an AVFrame, the codec will
3574 * allocate memory for the actual bitmap.
3575 * with default get/release_buffer(), the decoder frees/reuses the bitmap as it sees fit.
3576 * with overridden get/release_buffer() (needs CODEC_CAP_DR1) the user decides into what buffer the decoder
3577 * decodes and the decoder tells the user once it does not need the data anymore,
3578 * the user app can at this point free/reuse/keep the memory as it sees fit.
3580 * @param[in] avpkt The input AVpacket containing the input buffer.
3581 * You can create such packet with av_init_packet() and by then setting
3582 * data and size, some decoders might in addition need other fields like
3583 * flags&AV_PKT_FLAG_KEY. All decoders are designed to use the least
3585 * @param[in,out] got_picture_ptr Zero if no frame could be decompressed, otherwise, it is nonzero.
3586 * @return On error a negative value is returned, otherwise the number of bytes
3587 * used or zero if no frame could be decompressed.
3589 int avcodec_decode_video2(AVCodecContext *avctx, AVFrame *picture,
3590 int *got_picture_ptr,
3593 #if LIBAVCODEC_VERSION_MAJOR < 53
3594 /* Decode a subtitle message. Return -1 if error, otherwise return the
3595 * number of bytes used. If no subtitle could be decompressed,
3596 * got_sub_ptr is zero. Otherwise, the subtitle is stored in *sub. */
3597 attribute_deprecated int avcodec_decode_subtitle(AVCodecContext *avctx, AVSubtitle *sub,
3599 const uint8_t *buf, int buf_size);
3603 * Decode a subtitle message.
3604 * Return a negative value on error, otherwise return the number of bytes used.
3605 * If no subtitle could be decompressed, got_sub_ptr is zero.
3606 * Otherwise, the subtitle is stored in *sub.
3607 * Note that CODEC_CAP_DR1 is not available for subtitle codecs. This is for
3608 * simplicity, because the performance difference is expect to be negligible
3609 * and reusing a get_buffer written for video codecs would probably perform badly
3610 * due to a potentially very different allocation pattern.
3612 * @param avctx the codec context
3613 * @param[out] sub The AVSubtitle in which the decoded subtitle will be stored, must be
3614 freed with avsubtitle_free if *got_sub_ptr is set.
3615 * @param[in,out] got_sub_ptr Zero if no subtitle could be decompressed, otherwise, it is nonzero.
3616 * @param[in] avpkt The input AVPacket containing the input buffer.
3618 int avcodec_decode_subtitle2(AVCodecContext *avctx, AVSubtitle *sub,
3623 * Frees all allocated data in the given subtitle struct.
3625 * @param sub AVSubtitle to free.
3627 void avsubtitle_free(AVSubtitle *sub);
3629 int avcodec_parse_frame(AVCodecContext *avctx, uint8_t **pdata,
3631 uint8_t *buf, int buf_size);
3634 * Encode an audio frame from samples into buf.
3636 * @note The output buffer should be at least FF_MIN_BUFFER_SIZE bytes large.
3637 * However, for PCM audio the user will know how much space is needed
3638 * because it depends on the value passed in buf_size as described
3639 * below. In that case a lower value can be used.
3641 * @param avctx the codec context
3642 * @param[out] buf the output buffer
3643 * @param[in] buf_size the output buffer size
3644 * @param[in] samples the input buffer containing the samples
3645 * The number of samples read from this buffer is frame_size*channels,
3646 * both of which are defined in avctx.
3647 * For PCM audio the number of samples read from samples is equal to
3648 * buf_size * input_sample_size / output_sample_size.
3649 * @return On error a negative value is returned, on success zero or the number
3650 * of bytes used to encode the data read from the input buffer.
3652 int avcodec_encode_audio(AVCodecContext *avctx, uint8_t *buf, int buf_size,
3653 const short *samples);
3656 * Encode a video frame from pict into buf.
3657 * The input picture should be
3658 * stored using a specific format, namely avctx.pix_fmt.
3660 * @param avctx the codec context
3661 * @param[out] buf the output buffer for the bitstream of encoded frame
3662 * @param[in] buf_size the size of the output buffer in bytes
3663 * @param[in] pict the input picture to encode
3664 * @return On error a negative value is returned, on success zero or the number
3665 * of bytes used from the output buffer.
3667 int avcodec_encode_video(AVCodecContext *avctx, uint8_t *buf, int buf_size,
3668 const AVFrame *pict);
3669 int avcodec_encode_subtitle(AVCodecContext *avctx, uint8_t *buf, int buf_size,
3670 const AVSubtitle *sub);
3672 int avcodec_close(AVCodecContext *avctx);
3675 * Register all the codecs, parsers and bitstream filters which were enabled at
3676 * configuration time. If you do not call this function you can select exactly
3677 * which formats you want to support, by using the individual registration
3680 * @see avcodec_register
3681 * @see av_register_codec_parser
3682 * @see av_register_bitstream_filter
3684 void avcodec_register_all(void);
3687 * Flush buffers, should be called when seeking or when switching to a different stream.
3689 void avcodec_flush_buffers(AVCodecContext *avctx);
3691 void avcodec_default_free_buffers(AVCodecContext *s);
3693 /* misc useful functions */
3696 * Return a single letter to describe the given picture type pict_type.
3698 * @param[in] pict_type the picture type
3699 * @return A single character representing the picture type.
3701 char av_get_pict_type_char(int pict_type);
3704 * Return codec bits per sample.
3706 * @param[in] codec_id the codec
3707 * @return Number of bits per sample or zero if unknown for the given codec.
3709 int av_get_bits_per_sample(enum CodecID codec_id);
3712 * Return sample format bits per sample.
3714 * @param[in] sample_fmt the sample format
3715 * @return Number of bits per sample or zero if unknown for the given sample format.
3717 int av_get_bits_per_sample_format(enum SampleFormat sample_fmt);
3720 typedef struct AVCodecParserContext {
3722 struct AVCodecParser *parser;
3723 int64_t frame_offset; /* offset of the current frame */
3724 int64_t cur_offset; /* current offset
3725 (incremented by each av_parser_parse()) */
3726 int64_t next_frame_offset; /* offset of the next frame */
3728 int pict_type; /* XXX: Put it back in AVCodecContext. */
3730 * This field is used for proper frame duration computation in lavf.
3731 * It signals, how much longer the frame duration of the current frame
3732 * is compared to normal frame duration.
3734 * frame_duration = (1 + repeat_pict) * time_base
3736 * It is used by codecs like H.264 to display telecined material.
3738 int repeat_pict; /* XXX: Put it back in AVCodecContext. */
3739 int64_t pts; /* pts of the current frame */
3740 int64_t dts; /* dts of the current frame */
3745 int fetch_timestamp;
3747 #define AV_PARSER_PTS_NB 4
3748 int cur_frame_start_index;
3749 int64_t cur_frame_offset[AV_PARSER_PTS_NB];
3750 int64_t cur_frame_pts[AV_PARSER_PTS_NB];
3751 int64_t cur_frame_dts[AV_PARSER_PTS_NB];
3754 #define PARSER_FLAG_COMPLETE_FRAMES 0x0001
3755 #define PARSER_FLAG_ONCE 0x0002
3756 /// Set if the parser has a valid file offset
3757 #define PARSER_FLAG_FETCHED_OFFSET 0x0004
3759 int64_t offset; ///< byte offset from starting packet start
3760 int64_t cur_frame_end[AV_PARSER_PTS_NB];
3763 * Set by parser to 1 for key frames and 0 for non-key frames.
3764 * It is initialized to -1, so if the parser doesn't set this flag,
3765 * old-style fallback using FF_I_TYPE picture type as key frames
3771 * Time difference in stream time base units from the pts of this
3772 * packet to the point at which the output from the decoder has converged
3773 * independent from the availability of previous frames. That is, the
3774 * frames are virtually identical no matter if decoding started from
3775 * the very first frame or from this keyframe.
3776 * Is AV_NOPTS_VALUE if unknown.
3777 * This field is not the display duration of the current frame.
3778 * This field has no meaning if the packet does not have AV_PKT_FLAG_KEY
3781 * The purpose of this field is to allow seeking in streams that have no
3782 * keyframes in the conventional sense. It corresponds to the
3783 * recovery point SEI in H.264 and match_time_delta in NUT. It is also
3784 * essential for some types of subtitle streams to ensure that all
3785 * subtitles are correctly displayed after seeking.
3787 int64_t convergence_duration;
3789 // Timestamp generation support:
3791 * Synchronization point for start of timestamp generation.
3793 * Set to >0 for sync point, 0 for no sync point and <0 for undefined
3796 * For example, this corresponds to presence of H.264 buffering period
3802 * Offset of the current timestamp against last timestamp sync point in
3803 * units of AVCodecContext.time_base.
3805 * Set to INT_MIN when dts_sync_point unused. Otherwise, it must
3806 * contain a valid timestamp offset.
3808 * Note that the timestamp of sync point has usually a nonzero
3809 * dts_ref_dts_delta, which refers to the previous sync point. Offset of
3810 * the next frame after timestamp sync point will be usually 1.
3812 * For example, this corresponds to H.264 cpb_removal_delay.
3814 int dts_ref_dts_delta;
3817 * Presentation delay of current frame in units of AVCodecContext.time_base.
3819 * Set to INT_MIN when dts_sync_point unused. Otherwise, it must
3820 * contain valid non-negative timestamp delta (presentation time of a frame
3821 * must not lie in the past).
3823 * This delay represents the difference between decoding and presentation
3824 * time of the frame.
3826 * For example, this corresponds to H.264 dpb_output_delay.
3831 * Position of the packet in file.
3833 * Analogous to cur_frame_pts/dts
3835 int64_t cur_frame_pos[AV_PARSER_PTS_NB];
3838 * Byte position of currently parsed frame in stream.
3843 * Previous frame byte position.
3846 } AVCodecParserContext;
3848 typedef struct AVCodecParser {
3849 int codec_ids[5]; /* several codec IDs are permitted */
3851 int (*parser_init)(AVCodecParserContext *s);
3852 int (*parser_parse)(AVCodecParserContext *s,
3853 AVCodecContext *avctx,
3854 const uint8_t **poutbuf, int *poutbuf_size,
3855 const uint8_t *buf, int buf_size);
3856 void (*parser_close)(AVCodecParserContext *s);
3857 int (*split)(AVCodecContext *avctx, const uint8_t *buf, int buf_size);
3858 struct AVCodecParser *next;
3861 AVCodecParser *av_parser_next(AVCodecParser *c);
3863 void av_register_codec_parser(AVCodecParser *parser);
3864 AVCodecParserContext *av_parser_init(int codec_id);
3866 #if LIBAVCODEC_VERSION_MAJOR < 53
3867 attribute_deprecated
3868 int av_parser_parse(AVCodecParserContext *s,
3869 AVCodecContext *avctx,
3870 uint8_t **poutbuf, int *poutbuf_size,
3871 const uint8_t *buf, int buf_size,
3872 int64_t pts, int64_t dts);
3878 * @param s parser context.
3879 * @param avctx codec context.
3880 * @param poutbuf set to pointer to parsed buffer or NULL if not yet finished.
3881 * @param poutbuf_size set to size of parsed buffer or zero if not yet finished.
3882 * @param buf input buffer.
3883 * @param buf_size input length, to signal EOF, this should be 0 (so that the last frame can be output).
3884 * @param pts input presentation timestamp.
3885 * @param dts input decoding timestamp.
3886 * @param pos input byte position in stream.
3887 * @return the number of bytes of the input bitstream used.
3892 * len = av_parser_parse2(myparser, AVCodecContext, &data, &size,
3899 * decode_frame(data, size);
3903 int av_parser_parse2(AVCodecParserContext *s,
3904 AVCodecContext *avctx,
3905 uint8_t **poutbuf, int *poutbuf_size,
3906 const uint8_t *buf, int buf_size,
3907 int64_t pts, int64_t dts,
3910 int av_parser_change(AVCodecParserContext *s,
3911 AVCodecContext *avctx,
3912 uint8_t **poutbuf, int *poutbuf_size,
3913 const uint8_t *buf, int buf_size, int keyframe);
3914 void av_parser_close(AVCodecParserContext *s);
3917 typedef struct AVBitStreamFilterContext {
3919 struct AVBitStreamFilter *filter;
3920 AVCodecParserContext *parser;
3921 struct AVBitStreamFilterContext *next;
3922 } AVBitStreamFilterContext;
3925 typedef struct AVBitStreamFilter {
3928 int (*filter)(AVBitStreamFilterContext *bsfc,
3929 AVCodecContext *avctx, const char *args,
3930 uint8_t **poutbuf, int *poutbuf_size,
3931 const uint8_t *buf, int buf_size, int keyframe);
3932 void (*close)(AVBitStreamFilterContext *bsfc);
3933 struct AVBitStreamFilter *next;
3934 } AVBitStreamFilter;
3936 void av_register_bitstream_filter(AVBitStreamFilter *bsf);
3937 AVBitStreamFilterContext *av_bitstream_filter_init(const char *name);
3938 int av_bitstream_filter_filter(AVBitStreamFilterContext *bsfc,
3939 AVCodecContext *avctx, const char *args,
3940 uint8_t **poutbuf, int *poutbuf_size,
3941 const uint8_t *buf, int buf_size, int keyframe);
3942 void av_bitstream_filter_close(AVBitStreamFilterContext *bsf);
3944 AVBitStreamFilter *av_bitstream_filter_next(AVBitStreamFilter *f);
3949 * Reallocate the given block if it is not large enough, otherwise do nothing.
3953 void *av_fast_realloc(void *ptr, unsigned int *size, unsigned int min_size);
3956 * Allocate a buffer, reusing the given one if large enough.
3958 * Contrary to av_fast_realloc the current buffer contents might not be
3959 * preserved and on error the old buffer is freed, thus no special
3960 * handling to avoid memleaks is necessary.
3962 * @param ptr pointer to pointer to already allocated buffer, overwritten with pointer to new buffer
3963 * @param size size of the buffer *ptr points to
3964 * @param min_size minimum size of *ptr buffer after returning, *ptr will be NULL and
3965 * *size 0 if an error occurred.
3967 void av_fast_malloc(void *ptr, unsigned int *size, unsigned int min_size);
3969 #if LIBAVCODEC_VERSION_MAJOR < 53
3971 * @deprecated Deprecated in favor of av_image_copy().
3973 attribute_deprecated
3974 void av_picture_data_copy(uint8_t *dst_data[4], int dst_linesize[4],
3975 uint8_t *src_data[4], int src_linesize[4],
3976 enum PixelFormat pix_fmt, int width, int height);
3980 * Copy image src to dst. Wraps av_picture_data_copy() above.
3982 void av_picture_copy(AVPicture *dst, const AVPicture *src,
3983 enum PixelFormat pix_fmt, int width, int height);
3986 * Crop image top and left side.
3988 int av_picture_crop(AVPicture *dst, const AVPicture *src,
3989 enum PixelFormat pix_fmt, int top_band, int left_band);
3994 int av_picture_pad(AVPicture *dst, const AVPicture *src, int height, int width, enum PixelFormat pix_fmt,
3995 int padtop, int padbottom, int padleft, int padright, int *color);
3998 * Encode extradata length to a buffer. Used by xiph codecs.
4000 * @param s buffer to write to; must be at least (v/255+1) bytes long
4001 * @param v size of extradata in bytes
4002 * @return number of bytes written to the buffer.
4004 unsigned int av_xiphlacing(unsigned char *s, unsigned int v);
4006 #if LIBAVCODEC_VERSION_MAJOR < 53
4008 * Parse str and put in width_ptr and height_ptr the detected values.
4010 * @deprecated Deprecated in favor of av_parse_video_size().
4012 attribute_deprecated int av_parse_video_frame_size(int *width_ptr, int *height_ptr, const char *str);
4015 * Parse str and store the detected values in *frame_rate.
4017 * @deprecated Deprecated in favor of av_parse_video_rate().
4019 attribute_deprecated int av_parse_video_frame_rate(AVRational *frame_rate, const char *str);
4023 * Logs a generic warning message about a missing feature. This function is
4024 * intended to be used internally by FFmpeg (libavcodec, libavformat, etc.)
4025 * only, and would normally not be used by applications.
4026 * @param[in] avc a pointer to an arbitrary struct of which the first field is
4027 * a pointer to an AVClass struct
4028 * @param[in] feature string containing the name of the missing feature
4029 * @param[in] want_sample indicates if samples are wanted which exhibit this feature.
4030 * If want_sample is non-zero, additional verbage will be added to the log
4031 * message which tells the user how to report samples to the development
4034 void av_log_missing_feature(void *avc, const char *feature, int want_sample);
4037 * Log a generic warning message asking for a sample. This function is
4038 * intended to be used internally by FFmpeg (libavcodec, libavformat, etc.)
4039 * only, and would normally not be used by applications.
4040 * @param[in] avc a pointer to an arbitrary struct of which the first field is
4041 * a pointer to an AVClass struct
4042 * @param[in] msg string containing an optional message, or NULL if no message
4044 void av_log_ask_for_sample(void *avc, const char *msg);
4047 * Register the hardware accelerator hwaccel.
4049 void av_register_hwaccel(AVHWAccel *hwaccel);
4052 * If hwaccel is NULL, returns the first registered hardware accelerator,
4053 * if hwaccel is non-NULL, returns the next registered hardware accelerator
4054 * after hwaccel, or NULL if hwaccel is the last one.
4056 AVHWAccel *av_hwaccel_next(AVHWAccel *hwaccel);
4060 * Lock operation used by lockmgr
4063 AV_LOCK_CREATE, ///< Create a mutex
4064 AV_LOCK_OBTAIN, ///< Lock the mutex
4065 AV_LOCK_RELEASE, ///< Unlock the mutex
4066 AV_LOCK_DESTROY, ///< Free mutex resources
4070 * Register a user provided lock manager supporting the operations
4071 * specified by AVLockOp. mutex points to a (void *) where the
4072 * lockmgr should store/get a pointer to a user allocated mutex. It's
4073 * NULL upon AV_LOCK_CREATE and != NULL for all other ops.
4075 * @param cb User defined callback. Note: FFmpeg may invoke calls to this
4076 * callback during the call to av_lockmgr_register().
4077 * Thus, the application must be prepared to handle that.
4078 * If cb is set to NULL the lockmgr will be unregistered.
4079 * Also note that during unregistration the previously registered
4080 * lockmgr callback may also be invoked.
4082 int av_lockmgr_register(int (*cb)(void **mutex, enum AVLockOp op));
4084 #endif /* AVCODEC_AVCODEC_H */