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 93
35 #define LIBAVCODEC_VERSION_MICRO 0
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)
66 #ifndef FF_API_SUBTITLE_OLD
67 #define FF_API_SUBTITLE_OLD (LIBAVCODEC_VERSION_MAJOR < 53)
69 #ifndef FF_API_USE_LPC
70 #define FF_API_USE_LPC (LIBAVCODEC_VERSION_MAJOR < 53)
72 #ifndef FF_API_SET_STRING_OLD
73 #define FF_API_SET_STRING_OLD (LIBAVCODEC_VERSION_MAJOR < 53)
75 #ifndef FF_API_INOFFICIAL
76 #define FF_API_INOFFICIAL (LIBAVCODEC_VERSION_MAJOR < 53)
79 #define AV_NOPTS_VALUE INT64_C(0x8000000000000000)
80 #define AV_TIME_BASE 1000000
81 #define AV_TIME_BASE_Q (AVRational){1, AV_TIME_BASE}
84 * Identify the syntax and semantics of the bitstream.
85 * The principle is roughly:
86 * Two decoders with the same ID can decode the same streams.
87 * Two encoders with the same ID can encode compatible streams.
88 * There may be slight deviations from the principle due to implementation
91 * If you add a codec ID to this list, add it so that
92 * 1. no value of a existing codec ID changes (that would break ABI),
93 * 2. it is as close as possible to similar codecs.
100 CODEC_ID_MPEG2VIDEO, ///< preferred ID for MPEG-1/2 video decoding
101 CODEC_ID_MPEG2VIDEO_XVMC,
138 CODEC_ID_INTERPLAY_VIDEO,
150 CODEC_ID_TRUEMOTION1,
161 #if LIBAVCODEC_VERSION_MAJOR < 53
180 CODEC_ID_TRUEMOTION2,
197 CODEC_ID_DSICINVIDEO,
198 CODEC_ID_TIERTEXSEQVIDEO,
207 CODEC_ID_BETHSOFTVID,
225 CODEC_ID_MOTIONPIXELS,
243 CODEC_ID_IFF_BYTERUN1,
253 /* various PCM "codecs" */
254 CODEC_ID_PCM_S16LE= 0x10000,
270 CODEC_ID_PCM_S24DAUD,
272 CODEC_ID_PCM_S16LE_PLANAR,
281 /* various ADPCM codecs */
282 CODEC_ID_ADPCM_IMA_QT= 0x11000,
283 CODEC_ID_ADPCM_IMA_WAV,
284 CODEC_ID_ADPCM_IMA_DK3,
285 CODEC_ID_ADPCM_IMA_DK4,
286 CODEC_ID_ADPCM_IMA_WS,
287 CODEC_ID_ADPCM_IMA_SMJPEG,
296 CODEC_ID_ADPCM_YAMAHA,
297 CODEC_ID_ADPCM_SBPRO_4,
298 CODEC_ID_ADPCM_SBPRO_3,
299 CODEC_ID_ADPCM_SBPRO_2,
301 CODEC_ID_ADPCM_IMA_AMV,
302 CODEC_ID_ADPCM_EA_R1,
303 CODEC_ID_ADPCM_EA_R3,
304 CODEC_ID_ADPCM_EA_R2,
305 CODEC_ID_ADPCM_IMA_EA_SEAD,
306 CODEC_ID_ADPCM_IMA_EA_EACS,
307 CODEC_ID_ADPCM_EA_XAS,
308 CODEC_ID_ADPCM_EA_MAXIS_XA,
309 CODEC_ID_ADPCM_IMA_ISS,
313 CODEC_ID_AMR_NB= 0x12000,
316 /* RealAudio codecs*/
317 CODEC_ID_RA_144= 0x13000,
320 /* various DPCM codecs */
321 CODEC_ID_ROQ_DPCM= 0x14000,
322 CODEC_ID_INTERPLAY_DPCM,
327 CODEC_ID_MP2= 0x15000,
328 CODEC_ID_MP3, ///< preferred ID for decoding MPEG audio layer 1, 2 or 3
346 CODEC_ID_WESTWOOD_SND1,
347 CODEC_ID_GSM, ///< as in Berlin toast format
355 CODEC_ID_DSICINAUDIO,
359 CODEC_ID_GSM_MS, /* as found in WAV */
368 CODEC_ID_WMALOSSLESS,
377 CODEC_ID_BINKAUDIO_RDFT,
378 CODEC_ID_BINKAUDIO_DCT,
380 /* subtitle codecs */
381 CODEC_ID_DVD_SUBTITLE= 0x17000,
382 CODEC_ID_DVB_SUBTITLE,
383 CODEC_ID_TEXT, ///< raw UTF-8 text
387 CODEC_ID_HDMV_PGS_SUBTITLE,
388 CODEC_ID_DVB_TELETEXT,
391 /* other specific kind of codecs (generally used for attachments) */
392 CODEC_ID_TTF= 0x18000,
394 CODEC_ID_PROBE= 0x19000, ///< codec_id is not known (like CODEC_ID_NONE) but lavf should attempt to identify it
396 CODEC_ID_MPEG2TS= 0x20000, /**< _FAKE_ codec to indicate a raw MPEG-2 TS
397 * stream (only used by libavformat) */
400 #if LIBAVCODEC_VERSION_MAJOR < 53
401 #define CodecType AVMediaType
403 #define CODEC_TYPE_UNKNOWN AVMEDIA_TYPE_UNKNOWN
404 #define CODEC_TYPE_VIDEO AVMEDIA_TYPE_VIDEO
405 #define CODEC_TYPE_AUDIO AVMEDIA_TYPE_AUDIO
406 #define CODEC_TYPE_DATA AVMEDIA_TYPE_DATA
407 #define CODEC_TYPE_SUBTITLE AVMEDIA_TYPE_SUBTITLE
408 #define CODEC_TYPE_ATTACHMENT AVMEDIA_TYPE_ATTACHMENT
409 #define CODEC_TYPE_NB AVMEDIA_TYPE_NB
413 * all in native-endian format
416 SAMPLE_FMT_NONE = -1,
417 SAMPLE_FMT_U8, ///< unsigned 8 bits
418 SAMPLE_FMT_S16, ///< signed 16 bits
419 SAMPLE_FMT_S32, ///< signed 32 bits
420 SAMPLE_FMT_FLT, ///< float
421 SAMPLE_FMT_DBL, ///< double
422 SAMPLE_FMT_NB ///< Number of sample formats. DO NOT USE if dynamically linking to libavcodec
425 /* Audio channel masks */
426 #define CH_FRONT_LEFT 0x00000001
427 #define CH_FRONT_RIGHT 0x00000002
428 #define CH_FRONT_CENTER 0x00000004
429 #define CH_LOW_FREQUENCY 0x00000008
430 #define CH_BACK_LEFT 0x00000010
431 #define CH_BACK_RIGHT 0x00000020
432 #define CH_FRONT_LEFT_OF_CENTER 0x00000040
433 #define CH_FRONT_RIGHT_OF_CENTER 0x00000080
434 #define CH_BACK_CENTER 0x00000100
435 #define CH_SIDE_LEFT 0x00000200
436 #define CH_SIDE_RIGHT 0x00000400
437 #define CH_TOP_CENTER 0x00000800
438 #define CH_TOP_FRONT_LEFT 0x00001000
439 #define CH_TOP_FRONT_CENTER 0x00002000
440 #define CH_TOP_FRONT_RIGHT 0x00004000
441 #define CH_TOP_BACK_LEFT 0x00008000
442 #define CH_TOP_BACK_CENTER 0x00010000
443 #define CH_TOP_BACK_RIGHT 0x00020000
444 #define CH_STEREO_LEFT 0x20000000 ///< Stereo downmix.
445 #define CH_STEREO_RIGHT 0x40000000 ///< See CH_STEREO_LEFT.
447 /** Channel mask value used for AVCodecContext.request_channel_layout
448 to indicate that the user requests the channel order of the decoder output
449 to be the native codec channel order. */
450 #define CH_LAYOUT_NATIVE 0x8000000000000000LL
452 /* Audio channel convenience macros */
453 #define CH_LAYOUT_MONO (CH_FRONT_CENTER)
454 #define CH_LAYOUT_STEREO (CH_FRONT_LEFT|CH_FRONT_RIGHT)
455 #define CH_LAYOUT_2_1 (CH_LAYOUT_STEREO|CH_BACK_CENTER)
456 #define CH_LAYOUT_SURROUND (CH_LAYOUT_STEREO|CH_FRONT_CENTER)
457 #define CH_LAYOUT_4POINT0 (CH_LAYOUT_SURROUND|CH_BACK_CENTER)
458 #define CH_LAYOUT_2_2 (CH_LAYOUT_STEREO|CH_SIDE_LEFT|CH_SIDE_RIGHT)
459 #define CH_LAYOUT_QUAD (CH_LAYOUT_STEREO|CH_BACK_LEFT|CH_BACK_RIGHT)
460 #define CH_LAYOUT_5POINT0 (CH_LAYOUT_SURROUND|CH_SIDE_LEFT|CH_SIDE_RIGHT)
461 #define CH_LAYOUT_5POINT1 (CH_LAYOUT_5POINT0|CH_LOW_FREQUENCY)
462 #define CH_LAYOUT_5POINT0_BACK (CH_LAYOUT_SURROUND|CH_BACK_LEFT|CH_BACK_RIGHT)
463 #define CH_LAYOUT_5POINT1_BACK (CH_LAYOUT_5POINT0_BACK|CH_LOW_FREQUENCY)
464 #define CH_LAYOUT_7POINT0 (CH_LAYOUT_5POINT0|CH_BACK_LEFT|CH_BACK_RIGHT)
465 #define CH_LAYOUT_7POINT1 (CH_LAYOUT_5POINT1|CH_BACK_LEFT|CH_BACK_RIGHT)
466 #define CH_LAYOUT_7POINT1_WIDE (CH_LAYOUT_5POINT1_BACK|\
467 CH_FRONT_LEFT_OF_CENTER|CH_FRONT_RIGHT_OF_CENTER)
468 #define CH_LAYOUT_STEREO_DOWNMIX (CH_STEREO_LEFT|CH_STEREO_RIGHT)
471 #define AVCODEC_MAX_AUDIO_FRAME_SIZE 192000 // 1 second of 48khz 32bit audio
474 * Required number of additionally allocated bytes at the end of the input bitstream for decoding.
475 * This is mainly needed because some optimized bitstream readers read
476 * 32 or 64 bit at once and could read over the end.<br>
477 * Note: If the first 23 bits of the additional bytes are not 0, then damaged
478 * MPEG bitstreams could cause overread and segfault.
480 #define FF_INPUT_BUFFER_PADDING_SIZE 8
483 * minimum encoding buffer size
484 * Used to avoid some checks during header writing.
486 #define FF_MIN_BUFFER_SIZE 16384
490 * motion estimation type.
493 ME_ZERO = 1, ///< no search, that is use 0,0 vector whenever one is needed
497 ME_EPZS, ///< enhanced predictive zonal search
498 ME_X1, ///< reserved for experiments
499 ME_HEX, ///< hexagon based search
500 ME_UMH, ///< uneven multi-hexagon search
501 ME_ITER, ///< iterative search
502 ME_TESA, ///< transformed exhaustive search algorithm
506 /* We leave some space between them for extensions (drop some
507 * keyframes for intra-only or drop just some bidir frames). */
508 AVDISCARD_NONE =-16, ///< discard nothing
509 AVDISCARD_DEFAULT= 0, ///< discard useless packets like 0 size packets in avi
510 AVDISCARD_NONREF = 8, ///< discard all non reference
511 AVDISCARD_BIDIR = 16, ///< discard all bidirectional frames
512 AVDISCARD_NONKEY = 32, ///< discard all frames except keyframes
513 AVDISCARD_ALL = 48, ///< discard all
516 enum AVColorPrimaries{
517 AVCOL_PRI_BT709 =1, ///< also ITU-R BT1361 / IEC 61966-2-4 / SMPTE RP177 Annex B
518 AVCOL_PRI_UNSPECIFIED=2,
520 AVCOL_PRI_BT470BG =5, ///< also ITU-R BT601-6 625 / ITU-R BT1358 625 / ITU-R BT1700 625 PAL & SECAM
521 AVCOL_PRI_SMPTE170M =6, ///< also ITU-R BT601-6 525 / ITU-R BT1358 525 / ITU-R BT1700 NTSC
522 AVCOL_PRI_SMPTE240M =7, ///< functionally identical to above
524 AVCOL_PRI_NB , ///< Not part of ABI
527 enum AVColorTransferCharacteristic{
528 AVCOL_TRC_BT709 =1, ///< also ITU-R BT1361
529 AVCOL_TRC_UNSPECIFIED=2,
530 AVCOL_TRC_GAMMA22 =4, ///< also ITU-R BT470M / ITU-R BT1700 625 PAL & SECAM
531 AVCOL_TRC_GAMMA28 =5, ///< also ITU-R BT470BG
532 AVCOL_TRC_NB , ///< Not part of ABI
537 AVCOL_SPC_BT709 =1, ///< also ITU-R BT1361 / IEC 61966-2-4 xvYCC709 / SMPTE RP177 Annex B
538 AVCOL_SPC_UNSPECIFIED=2,
540 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
541 AVCOL_SPC_SMPTE170M =6, ///< also ITU-R BT601-6 525 / ITU-R BT1358 525 / ITU-R BT1700 NTSC / functionally identical to above
542 AVCOL_SPC_SMPTE240M =7,
543 AVCOL_SPC_NB , ///< Not part of ABI
547 AVCOL_RANGE_UNSPECIFIED=0,
548 AVCOL_RANGE_MPEG =1, ///< the normal 219*2^(n-8) "MPEG" YUV ranges
549 AVCOL_RANGE_JPEG =2, ///< the normal 2^n-1 "JPEG" YUV ranges
550 AVCOL_RANGE_NB , ///< Not part of ABI
554 * X X 3 4 X X are luma samples,
555 * 1 2 1-6 are possible chroma positions
556 * X X 5 6 X 0 is undefined/unknown position
558 enum AVChromaLocation{
559 AVCHROMA_LOC_UNSPECIFIED=0,
560 AVCHROMA_LOC_LEFT =1, ///< mpeg2/4, h264 default
561 AVCHROMA_LOC_CENTER =2, ///< mpeg1, jpeg, h263
562 AVCHROMA_LOC_TOPLEFT =3, ///< DV
564 AVCHROMA_LOC_BOTTOMLEFT =5,
565 AVCHROMA_LOC_BOTTOM =6,
566 AVCHROMA_LOC_NB , ///< Not part of ABI
573 AV_LPC_TYPE_DEFAULT = -1, ///< use the codec default LPC type
574 AV_LPC_TYPE_NONE = 0, ///< do not use LPC prediction or use all zero coefficients
575 AV_LPC_TYPE_FIXED = 1, ///< fixed LPC coefficients
576 AV_LPC_TYPE_LEVINSON = 2, ///< Levinson-Durbin recursion
577 AV_LPC_TYPE_CHOLESKY = 3, ///< Cholesky factorization
578 AV_LPC_TYPE_NB , ///< Not part of ABI
581 typedef struct RcOverride{
584 int qscale; // If this is 0 then quality_factor will be used instead.
585 float quality_factor;
588 #define FF_MAX_B_FRAMES 16
591 These flags can be passed in AVCodecContext.flags before initialization.
592 Note: Not everything is supported yet.
595 #define CODEC_FLAG_QSCALE 0x0002 ///< Use fixed qscale.
596 #define CODEC_FLAG_4MV 0x0004 ///< 4 MV per MB allowed / advanced prediction for H.263.
597 #define CODEC_FLAG_QPEL 0x0010 ///< Use qpel MC.
598 #define CODEC_FLAG_GMC 0x0020 ///< Use GMC.
599 #define CODEC_FLAG_MV0 0x0040 ///< Always try a MB with MV=<0,0>.
600 #define CODEC_FLAG_PART 0x0080 ///< Use data partitioning.
602 * The parent program guarantees that the input for B-frames containing
603 * streams is not written to for at least s->max_b_frames+1 frames, if
604 * this is not set the input will be copied.
606 #define CODEC_FLAG_INPUT_PRESERVED 0x0100
607 #define CODEC_FLAG_PASS1 0x0200 ///< Use internal 2pass ratecontrol in first pass mode.
608 #define CODEC_FLAG_PASS2 0x0400 ///< Use internal 2pass ratecontrol in second pass mode.
609 #define CODEC_FLAG_EXTERN_HUFF 0x1000 ///< Use external Huffman table (for MJPEG).
610 #define CODEC_FLAG_GRAY 0x2000 ///< Only decode/encode grayscale.
611 #define CODEC_FLAG_EMU_EDGE 0x4000 ///< Don't draw edges.
612 #define CODEC_FLAG_PSNR 0x8000 ///< error[?] variables will be set during encoding.
613 #define CODEC_FLAG_TRUNCATED 0x00010000 /** Input bitstream might be truncated at a random
614 location instead of only at frame boundaries. */
615 #define CODEC_FLAG_NORMALIZE_AQP 0x00020000 ///< Normalize adaptive quantization.
616 #define CODEC_FLAG_INTERLACED_DCT 0x00040000 ///< Use interlaced DCT.
617 #define CODEC_FLAG_LOW_DELAY 0x00080000 ///< Force low delay.
618 #define CODEC_FLAG_ALT_SCAN 0x00100000 ///< Use alternate scan.
619 #define CODEC_FLAG_GLOBAL_HEADER 0x00400000 ///< Place global headers in extradata instead of every keyframe.
620 #define CODEC_FLAG_BITEXACT 0x00800000 ///< Use only bitexact stuff (except (I)DCT).
621 /* Fx : Flag for h263+ extra options */
622 #define CODEC_FLAG_AC_PRED 0x01000000 ///< H.263 advanced intra coding / MPEG-4 AC prediction
623 #define CODEC_FLAG_H263P_UMV 0x02000000 ///< unlimited motion vector
624 #define CODEC_FLAG_CBP_RD 0x04000000 ///< Use rate distortion optimization for cbp.
625 #define CODEC_FLAG_QP_RD 0x08000000 ///< Use rate distortion optimization for qp selectioon.
626 #define CODEC_FLAG_H263P_AIV 0x00000008 ///< H.263 alternative inter VLC
627 #define CODEC_FLAG_OBMC 0x00000001 ///< OBMC
628 #define CODEC_FLAG_LOOP_FILTER 0x00000800 ///< loop filter
629 #define CODEC_FLAG_H263P_SLICE_STRUCT 0x10000000
630 #define CODEC_FLAG_INTERLACED_ME 0x20000000 ///< interlaced motion estimation
631 #define CODEC_FLAG_SVCD_SCAN_OFFSET 0x40000000 ///< Will reserve space for SVCD scan offset user data.
632 #define CODEC_FLAG_CLOSED_GOP 0x80000000
633 #define CODEC_FLAG2_FAST 0x00000001 ///< Allow non spec compliant speedup tricks.
634 #define CODEC_FLAG2_STRICT_GOP 0x00000002 ///< Strictly enforce GOP size.
635 #define CODEC_FLAG2_NO_OUTPUT 0x00000004 ///< Skip bitstream encoding.
636 #define CODEC_FLAG2_LOCAL_HEADER 0x00000008 ///< Place global headers at every keyframe instead of in extradata.
637 #define CODEC_FLAG2_BPYRAMID 0x00000010 ///< H.264 allow B-frames to be used as references.
638 #define CODEC_FLAG2_WPRED 0x00000020 ///< H.264 weighted biprediction for B-frames
639 #define CODEC_FLAG2_MIXED_REFS 0x00000040 ///< H.264 one reference per partition, as opposed to one reference per macroblock
640 #define CODEC_FLAG2_8X8DCT 0x00000080 ///< H.264 high profile 8x8 transform
641 #define CODEC_FLAG2_FASTPSKIP 0x00000100 ///< H.264 fast pskip
642 #define CODEC_FLAG2_AUD 0x00000200 ///< H.264 access unit delimiters
643 #define CODEC_FLAG2_BRDO 0x00000400 ///< B-frame rate-distortion optimization
644 #define CODEC_FLAG2_INTRA_VLC 0x00000800 ///< Use MPEG-2 intra VLC table.
645 #define CODEC_FLAG2_MEMC_ONLY 0x00001000 ///< Only do ME/MC (I frames -> ref, P frame -> ME+MC).
646 #define CODEC_FLAG2_DROP_FRAME_TIMECODE 0x00002000 ///< timecode is in drop frame format.
647 #define CODEC_FLAG2_SKIP_RD 0x00004000 ///< RD optimal MB level residual skipping
648 #define CODEC_FLAG2_CHUNKS 0x00008000 ///< Input bitstream might be truncated at a packet boundaries instead of only at frame boundaries.
649 #define CODEC_FLAG2_NON_LINEAR_QUANT 0x00010000 ///< Use MPEG-2 nonlinear quantizer.
650 #define CODEC_FLAG2_BIT_RESERVOIR 0x00020000 ///< Use a bit reservoir when encoding if possible
651 #define CODEC_FLAG2_MBTREE 0x00040000 ///< Use macroblock tree ratecontrol (x264 only)
652 #define CODEC_FLAG2_PSY 0x00080000 ///< Use psycho visual optimizations.
653 #define CODEC_FLAG2_SSIM 0x00100000 ///< Compute SSIM during encoding, error[] values are undefined.
654 #define CODEC_FLAG2_INTRA_REFRESH 0x00200000 ///< Use periodic insertion of intra blocks instead of keyframes.
656 /* Unsupported options :
657 * Syntax Arithmetic coding (SAC)
658 * Reference Picture Selection
659 * Independent Segment Decoding */
661 /* codec capabilities */
663 #define CODEC_CAP_DRAW_HORIZ_BAND 0x0001 ///< Decoder can use draw_horiz_band callback.
665 * Codec uses get_buffer() for allocating buffers and supports custom allocators.
666 * If not set, it might not use get_buffer() at all or use operations that
667 * assume the buffer was allocated by avcodec_default_get_buffer.
669 #define CODEC_CAP_DR1 0x0002
670 /* If 'parse_only' field is true, then avcodec_parse_frame() can be used. */
671 #define CODEC_CAP_PARSE_ONLY 0x0004
672 #define CODEC_CAP_TRUNCATED 0x0008
673 /* Codec can export data for HW decoding (XvMC). */
674 #define CODEC_CAP_HWACCEL 0x0010
676 * Codec has a nonzero delay and needs to be fed with NULL at the end to get the delayed data.
677 * If this is not set, the codec is guaranteed to never be fed with NULL data.
679 #define CODEC_CAP_DELAY 0x0020
681 * Codec can be fed a final frame with a smaller size.
682 * This can be used to prevent truncation of the last audio samples.
684 #define CODEC_CAP_SMALL_LAST_FRAME 0x0040
686 * Codec can export data for HW decoding (VDPAU).
688 #define CODEC_CAP_HWACCEL_VDPAU 0x0080
690 * Codec can output multiple frames per AVPacket
691 * Normally demuxers return one frame at a time, demuxers which do not do
692 * are connected to a parser to split what they return into proper frames.
693 * This flag is reserved to the very rare category of codecs which have a
694 * bitstream that cannot be split into frames without timeconsuming
695 * operations like full decoding. Demuxers carring such bitstreams thus
696 * may return multiple frames in a packet. This has many disadvantages like
697 * prohibiting stream copy in many cases thus it should only be considered
700 #define CODEC_CAP_SUBFRAMES 0x0100
702 * Codec is experimental and is thus avoided in favor of non experimental
705 #define CODEC_CAP_EXPERIMENTAL 0x0200
707 * Codec should fill in channel configuration and samplerate instead of container
709 #define CODEC_CAP_CHANNEL_CONF 0x0400
712 //The following defines may change, don't expect compatibility if you use them.
713 #define MB_TYPE_INTRA4x4 0x0001
714 #define MB_TYPE_INTRA16x16 0x0002 //FIXME H.264-specific
715 #define MB_TYPE_INTRA_PCM 0x0004 //FIXME H.264-specific
716 #define MB_TYPE_16x16 0x0008
717 #define MB_TYPE_16x8 0x0010
718 #define MB_TYPE_8x16 0x0020
719 #define MB_TYPE_8x8 0x0040
720 #define MB_TYPE_INTERLACED 0x0080
721 #define MB_TYPE_DIRECT2 0x0100 //FIXME
722 #define MB_TYPE_ACPRED 0x0200
723 #define MB_TYPE_GMC 0x0400
724 #define MB_TYPE_SKIP 0x0800
725 #define MB_TYPE_P0L0 0x1000
726 #define MB_TYPE_P1L0 0x2000
727 #define MB_TYPE_P0L1 0x4000
728 #define MB_TYPE_P1L1 0x8000
729 #define MB_TYPE_L0 (MB_TYPE_P0L0 | MB_TYPE_P1L0)
730 #define MB_TYPE_L1 (MB_TYPE_P0L1 | MB_TYPE_P1L1)
731 #define MB_TYPE_L0L1 (MB_TYPE_L0 | MB_TYPE_L1)
732 #define MB_TYPE_QUANT 0x00010000
733 #define MB_TYPE_CBP 0x00020000
734 //Note bits 24-31 are reserved for codec specific use (h264 ref0, mpeg1 0mv, ...)
738 * This specifies the area which should be displayed.
739 * Note there may be multiple such areas for one frame.
741 typedef struct AVPanScan{
744 * - encoding: Set by user.
745 * - decoding: Set by libavcodec.
750 * width and height in 1/16 pel
751 * - encoding: Set by user.
752 * - decoding: Set by libavcodec.
758 * position of the top left corner in 1/16 pel for up to 3 fields/frames
759 * - encoding: Set by user.
760 * - decoding: Set by libavcodec.
762 int16_t position[3][2];
765 #define FF_COMMON_FRAME \
767 * pointer to the picture planes.\
768 * This might be different from the first allocated byte\
775 * pointer to the first allocated byte of the picture. Can be used in get_buffer/release_buffer.\
776 * This isn't used by libavcodec unless the default get/release_buffer() is used.\
782 * 1 -> keyframe, 0-> not\
783 * - encoding: Set by libavcodec.\
784 * - decoding: Set by libavcodec.\
789 * Picture type of the frame, see ?_TYPE below.\
790 * - encoding: Set by libavcodec. for coded_picture (and set by user for input).\
791 * - decoding: Set by libavcodec.\
796 * presentation timestamp in time_base units (time when frame should be shown to user)\
797 * If AV_NOPTS_VALUE then frame_rate = 1/time_base will be assumed.\
798 * - encoding: MUST be set by user.\
799 * - decoding: Set by libavcodec.\
804 * picture number in bitstream order\
805 * - encoding: set by\
806 * - decoding: Set by libavcodec.\
808 int coded_picture_number;\
810 * picture number in display order\
811 * - encoding: set by\
812 * - decoding: Set by libavcodec.\
814 int display_picture_number;\
817 * quality (between 1 (good) and FF_LAMBDA_MAX (bad)) \
818 * - encoding: Set by libavcodec. for coded_picture (and set by user for input).\
819 * - decoding: Set by libavcodec.\
824 * buffer age (1->was last buffer and dint change, 2->..., ...).\
825 * Set to INT_MAX if the buffer has not been used yet.\
826 * - encoding: unused\
827 * - decoding: MUST be set by get_buffer().\
832 * is this picture used as reference\
833 * The values for this are the same as the MpegEncContext.picture_structure\
834 * variable, that is 1->top field, 2->bottom field, 3->frame/both fields.\
835 * Set to 4 for delayed, non-reference frames.\
836 * - encoding: unused\
837 * - decoding: Set by libavcodec. (before get_buffer() call)).\
843 * - encoding: unused\
844 * - decoding: Set by libavcodec.\
846 int8_t *qscale_table;\
849 * - encoding: unused\
850 * - decoding: Set by libavcodec.\
855 * mbskip_table[mb]>=1 if MB didn't change\
856 * stride= mb_width = (width+15)>>4\
857 * - encoding: unused\
858 * - decoding: Set by libavcodec.\
860 uint8_t *mbskip_table;\
863 * motion vector table\
866 * int mv_sample_log2= 4 - motion_subsample_log2;\
867 * int mb_width= (width+15)>>4;\
868 * int mv_stride= (mb_width << mv_sample_log2) + 1;\
869 * motion_val[direction][x + y*mv_stride][0->mv_x, 1->mv_y];\
871 * - encoding: Set by user.\
872 * - decoding: Set by libavcodec.\
874 int16_t (*motion_val[2])[2];\
877 * macroblock type table\
878 * mb_type_base + mb_width + 2\
879 * - encoding: Set by user.\
880 * - decoding: Set by libavcodec.\
885 * log2 of the size of the block which a single vector in motion_val represents: \
886 * (4->16x16, 3->8x8, 2-> 4x4, 1-> 2x2)\
887 * - encoding: unused\
888 * - decoding: Set by libavcodec.\
890 uint8_t motion_subsample_log2;\
893 * for some private data of the user\
894 * - encoding: unused\
895 * - decoding: Set by user.\
901 * - encoding: Set by libavcodec. if flags&CODEC_FLAG_PSNR.\
902 * - decoding: unused\
907 * type of the buffer (to keep track of who has to deallocate data[*])\
908 * - encoding: Set by the one who allocates it.\
909 * - decoding: Set by the one who allocates it.\
910 * Note: User allocated (direct rendering) & internal buffers cannot coexist currently.\
915 * When decoding, this signals how much the picture must be delayed.\
916 * extra_delay = repeat_pict / (2*fps)\
917 * - encoding: unused\
918 * - decoding: Set by libavcodec.\
928 * The content of the picture is interlaced.\
929 * - encoding: Set by user.\
930 * - decoding: Set by libavcodec. (default 0)\
932 int interlaced_frame;\
935 * If the content is interlaced, is top field displayed first.\
936 * - encoding: Set by user.\
937 * - decoding: Set by libavcodec.\
939 int top_field_first;\
943 * - encoding: Set by user.\
944 * - decoding: Set by libavcodec.\
946 AVPanScan *pan_scan;\
949 * Tell user application that palette has changed from previous frame.\
950 * - encoding: ??? (no palette-enabled encoder yet)\
951 * - decoding: Set by libavcodec. (default 0).\
953 int palette_has_changed;\
956 * codec suggestion on buffer type if != 0\
957 * - encoding: unused\
958 * - decoding: Set by libavcodec. (before get_buffer() call)).\
964 * - encoding: unused\
965 * - decoding: Set by libavcodec.\
970 * motion reference frame index\
971 * the order in which these are stored can depend on the codec.\
972 * - encoding: Set by user.\
973 * - decoding: Set by libavcodec.\
975 int8_t *ref_index[2];\
978 * reordered opaque 64bit number (generally a PTS) from AVCodecContext.reordered_opaque\
979 * output in AVFrame.reordered_opaque\
980 * - encoding: unused\
981 * - decoding: Read by user.\
983 int64_t reordered_opaque;\
986 * hardware accelerator private data (FFmpeg allocated)\
987 * - encoding: unused\
988 * - decoding: Set by libavcodec\
990 void *hwaccel_picture_private;\
993 #define FF_QSCALE_TYPE_MPEG1 0
994 #define FF_QSCALE_TYPE_MPEG2 1
995 #define FF_QSCALE_TYPE_H264 2
996 #define FF_QSCALE_TYPE_VP56 3
998 #define FF_BUFFER_TYPE_INTERNAL 1
999 #define FF_BUFFER_TYPE_USER 2 ///< direct rendering buffers (image is (de)allocated by user)
1000 #define FF_BUFFER_TYPE_SHARED 4 ///< Buffer from somewhere else; don't deallocate image (data/base), all other tables are not shared.
1001 #define FF_BUFFER_TYPE_COPY 8 ///< Just a (modified) copy of some other buffer, don't deallocate anything.
1004 #define FF_I_TYPE 1 ///< Intra
1005 #define FF_P_TYPE 2 ///< Predicted
1006 #define FF_B_TYPE 3 ///< Bi-dir predicted
1007 #define FF_S_TYPE 4 ///< S(GMC)-VOP MPEG4
1008 #define FF_SI_TYPE 5 ///< Switching Intra
1009 #define FF_SP_TYPE 6 ///< Switching Predicted
1010 #define FF_BI_TYPE 7
1012 #define FF_BUFFER_HINTS_VALID 0x01 // Buffer hints value is meaningful (if 0 ignore).
1013 #define FF_BUFFER_HINTS_READABLE 0x02 // Codec will read from buffer.
1014 #define FF_BUFFER_HINTS_PRESERVE 0x04 // User must not alter buffer content.
1015 #define FF_BUFFER_HINTS_REUSABLE 0x08 // Codec will reuse the buffer (update).
1017 typedef struct AVPacket {
1019 * Presentation timestamp in AVStream->time_base units; the time at which
1020 * the decompressed packet will be presented to the user.
1021 * Can be AV_NOPTS_VALUE if it is not stored in the file.
1022 * pts MUST be larger or equal to dts as presentation cannot happen before
1023 * decompression, unless one wants to view hex dumps. Some formats misuse
1024 * the terms dts and pts/cts to mean something different. Such timestamps
1025 * must be converted to true pts/dts before they are stored in AVPacket.
1029 * Decompression timestamp in AVStream->time_base units; the time at which
1030 * the packet is decompressed.
1031 * Can be AV_NOPTS_VALUE if it is not stored in the file.
1039 * Duration of this packet in AVStream->time_base units, 0 if unknown.
1040 * Equals next_pts - this_pts in presentation order.
1043 void (*destruct)(struct AVPacket *);
1045 int64_t pos; ///< byte position in stream, -1 if unknown
1048 * Time difference in AVStream->time_base units from the pts of this
1049 * packet to the point at which the output from the decoder has converged
1050 * independent from the availability of previous frames. That is, the
1051 * frames are virtually identical no matter if decoding started from
1052 * the very first frame or from this keyframe.
1053 * Is AV_NOPTS_VALUE if unknown.
1054 * This field is not the display duration of the current packet.
1055 * This field has no meaning if the packet does not have AV_PKT_FLAG_KEY
1058 * The purpose of this field is to allow seeking in streams that have no
1059 * keyframes in the conventional sense. It corresponds to the
1060 * recovery point SEI in H.264 and match_time_delta in NUT. It is also
1061 * essential for some types of subtitle streams to ensure that all
1062 * subtitles are correctly displayed after seeking.
1064 int64_t convergence_duration;
1066 #define AV_PKT_FLAG_KEY 0x0001
1067 #if LIBAVCODEC_VERSION_MAJOR < 53
1068 #define PKT_FLAG_KEY AV_PKT_FLAG_KEY
1072 * Audio Video Frame.
1073 * New fields can be added to the end of FF_COMMON_FRAME with minor version
1075 * Removal, reordering and changes to existing fields require a major
1076 * version bump. No fields should be added into AVFrame before or after
1078 * sizeof(AVFrame) must not be used outside libav*.
1080 typedef struct AVFrame {
1085 * main external API structure.
1086 * New fields can be added to the end with minor version bumps.
1087 * Removal, reordering and changes to existing fields require a major
1089 * sizeof(AVCodecContext) must not be used outside libav*.
1091 typedef struct AVCodecContext {
1093 * information on struct for av_log
1094 * - set by avcodec_alloc_context
1096 const AVClass *av_class;
1098 * the average bitrate
1099 * - encoding: Set by user; unused for constant quantizer encoding.
1100 * - decoding: Set by libavcodec. 0 or some bitrate if this info is available in the stream.
1105 * number of bits the bitstream is allowed to diverge from the reference.
1106 * the reference can be CBR (for CBR pass1) or VBR (for pass2)
1107 * - encoding: Set by user; unused for constant quantizer encoding.
1108 * - decoding: unused
1110 int bit_rate_tolerance;
1114 * - encoding: Set by user.
1115 * - decoding: Set by user.
1120 * Some codecs need additional format info. It is stored here.
1121 * If any muxer uses this then ALL demuxers/parsers AND encoders for the
1122 * specific codec MUST set it correctly otherwise stream copy breaks.
1123 * In general use of this field by muxers is not recommanded.
1124 * - encoding: Set by libavcodec.
1125 * - decoding: Set by libavcodec. (FIXME: Is this OK?)
1130 * Motion estimation algorithm used for video coding.
1131 * 1 (zero), 2 (full), 3 (log), 4 (phods), 5 (epzs), 6 (x1), 7 (hex),
1132 * 8 (umh), 9 (iter), 10 (tesa) [7, 8, 10 are x264 specific, 9 is snow specific]
1133 * - encoding: MUST be set by user.
1134 * - decoding: unused
1139 * some codecs need / can use extradata like Huffman tables.
1140 * mjpeg: Huffman tables
1141 * rv10: additional flags
1142 * mpeg4: global headers (they can be in the bitstream or here)
1143 * The allocated memory should be FF_INPUT_BUFFER_PADDING_SIZE bytes larger
1144 * than extradata_size to avoid prolems if it is read with the bitstream reader.
1145 * The bytewise contents of extradata must not depend on the architecture or CPU endianness.
1146 * - encoding: Set/allocated/freed by libavcodec.
1147 * - decoding: Set/allocated/freed by user.
1153 * This is the fundamental unit of time (in seconds) in terms
1154 * of which frame timestamps are represented. For fixed-fps content,
1155 * timebase should be 1/framerate and timestamp increments should be
1157 * - encoding: MUST be set by user.
1158 * - decoding: Set by libavcodec.
1160 AVRational time_base;
1164 * picture width / height.
1165 * - encoding: MUST be set by user.
1166 * - decoding: Set by libavcodec.
1167 * Note: For compatibility it is possible to set this instead of
1168 * coded_width/height before decoding.
1172 #define FF_ASPECT_EXTENDED 15
1175 * the number of pictures in a group of pictures, or 0 for intra_only
1176 * - encoding: Set by user.
1177 * - decoding: unused
1182 * Pixel format, see PIX_FMT_xxx.
1183 * May be set by the demuxer if known from headers.
1184 * May be overriden by the decoder if it knows better.
1185 * - encoding: Set by user.
1186 * - decoding: Set by user if known, overridden by libavcodec if known
1188 enum PixelFormat pix_fmt;
1191 * Frame rate emulation. If not zero, the lower layer (i.e. format handler)
1192 * has to read frames at native frame rate.
1193 * - encoding: Set by user.
1194 * - decoding: unused
1199 * If non NULL, 'draw_horiz_band' is called by the libavcodec
1200 * decoder to draw a horizontal band. It improves cache usage. Not
1201 * all codecs can do that. You must check the codec capabilities
1203 * The function is also used by hardware acceleration APIs.
1204 * It is called at least once during frame decoding to pass
1205 * the data needed for hardware render.
1206 * In that mode instead of pixel data, AVFrame points to
1207 * a structure specific to the acceleration API. The application
1208 * reads the structure and can change some fields to indicate progress
1210 * - encoding: unused
1211 * - decoding: Set by user.
1212 * @param height the height of the slice
1213 * @param y the y position of the slice
1214 * @param type 1->top field, 2->bottom field, 3->frame
1215 * @param offset offset into the AVFrame.data from which the slice should be read
1217 void (*draw_horiz_band)(struct AVCodecContext *s,
1218 const AVFrame *src, int offset[4],
1219 int y, int type, int height);
1222 int sample_rate; ///< samples per second
1223 int channels; ///< number of audio channels
1226 * audio sample format
1227 * - encoding: Set by user.
1228 * - decoding: Set by libavcodec.
1230 enum SampleFormat sample_fmt; ///< sample format
1232 /* The following data should not be initialized. */
1234 * Samples per packet, initialized when calling 'init'.
1237 int frame_number; ///< audio or video frame number
1238 #if LIBAVCODEC_VERSION_MAJOR < 53
1239 int real_pict_num; ///< Returns the real picture number of previous encoded frame.
1243 * Number of frames the decoded output will be delayed relative to
1244 * the encoded input.
1245 * - encoding: Set by libavcodec.
1246 * - decoding: unused
1250 /* - encoding parameters */
1251 float qcompress; ///< amount of qscale change between easy & hard scenes (0.0-1.0)
1252 float qblur; ///< amount of qscale smoothing over time (0.0-1.0)
1256 * - encoding: Set by user.
1257 * - decoding: unused
1263 * - encoding: Set by user.
1264 * - decoding: unused
1269 * maximum quantizer difference between frames
1270 * - encoding: Set by user.
1271 * - decoding: unused
1276 * maximum number of B-frames between non-B-frames
1277 * Note: The output will be delayed by max_b_frames+1 relative to the input.
1278 * - encoding: Set by user.
1279 * - decoding: unused
1284 * qscale factor between IP and B-frames
1285 * If > 0 then the last P-frame quantizer will be used (q= lastp_q*factor+offset).
1286 * If < 0 then normal ratecontrol will be done (q= -normal_q*factor+offset).
1287 * - encoding: Set by user.
1288 * - decoding: unused
1290 float b_quant_factor;
1292 /** obsolete FIXME remove */
1294 #define FF_RC_STRATEGY_XVID 1
1296 int b_frame_strategy;
1300 * - encoding: unused
1301 * - decoding: Set by user. 1-> Skip B-frames, 2-> Skip IDCT/dequant too, 5-> Skip everything except header
1302 * @deprecated Deprecated in favor of skip_idct and skip_frame.
1306 struct AVCodec *codec;
1310 int rtp_payload_size; /* The size of the RTP payload: the coder will */
1311 /* do its best to deliver a chunk with size */
1312 /* below rtp_payload_size, the chunk will start */
1313 /* with a start code on some codecs like H.263. */
1314 /* This doesn't take account of any particular */
1315 /* headers inside the transmitted RTP payload. */
1318 /* The RTP callback: This function is called */
1319 /* every time the encoder has a packet to send. */
1320 /* It depends on the encoder if the data starts */
1321 /* with a Start Code (it should). H.263 does. */
1322 /* mb_nb contains the number of macroblocks */
1323 /* encoded in the RTP payload. */
1324 void (*rtp_callback)(struct AVCodecContext *avctx, void *data, int size, int mb_nb);
1326 /* statistics, used for 2-pass encoding */
1337 * number of bits used for the previously encoded frame
1338 * - encoding: Set by libavcodec.
1339 * - decoding: unused
1344 * Private data of the user, can be used to carry app specific stuff.
1345 * - encoding: Set by user.
1346 * - decoding: Set by user.
1350 char codec_name[32];
1351 enum AVMediaType codec_type; /* see AVMEDIA_TYPE_xxx */
1352 enum CodecID codec_id; /* see CODEC_ID_xxx */
1355 * fourcc (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A').
1356 * This is used to work around some encoder bugs.
1357 * A demuxer should set this to what is stored in the field used to identify the codec.
1358 * If there are multiple such fields in a container then the demuxer should choose the one
1359 * which maximizes the information about the used codec.
1360 * If the codec tag field in a container is larger then 32 bits then the demuxer should
1361 * remap the longer ID to 32 bits with a table or other structure. Alternatively a new
1362 * extra_codec_tag + size could be added but for this a clear advantage must be demonstrated
1364 * - encoding: Set by user, if not then the default based on codec_id will be used.
1365 * - decoding: Set by user, will be converted to uppercase by libavcodec during init.
1367 unsigned int codec_tag;
1370 * Work around bugs in encoders which sometimes cannot be detected automatically.
1371 * - encoding: Set by user
1372 * - decoding: Set by user
1374 int workaround_bugs;
1375 #define FF_BUG_AUTODETECT 1 ///< autodetection
1376 #define FF_BUG_OLD_MSMPEG4 2
1377 #define FF_BUG_XVID_ILACE 4
1378 #define FF_BUG_UMP4 8
1379 #define FF_BUG_NO_PADDING 16
1380 #define FF_BUG_AMV 32
1381 #define FF_BUG_AC_VLC 0 ///< Will be removed, libavcodec can now handle these non-compliant files by default.
1382 #define FF_BUG_QPEL_CHROMA 64
1383 #define FF_BUG_STD_QPEL 128
1384 #define FF_BUG_QPEL_CHROMA2 256
1385 #define FF_BUG_DIRECT_BLOCKSIZE 512
1386 #define FF_BUG_EDGE 1024
1387 #define FF_BUG_HPEL_CHROMA 2048
1388 #define FF_BUG_DC_CLIP 4096
1389 #define FF_BUG_MS 8192 ///< Work around various bugs in Microsoft's broken decoders.
1390 #define FF_BUG_TRUNCATED 16384
1391 //#define FF_BUG_FAKE_SCALABILITY 16 //Autodetection should work 100%.
1394 * luma single coefficient elimination threshold
1395 * - encoding: Set by user.
1396 * - decoding: unused
1398 int luma_elim_threshold;
1401 * chroma single coeff elimination threshold
1402 * - encoding: Set by user.
1403 * - decoding: unused
1405 int chroma_elim_threshold;
1408 * strictly follow the standard (MPEG4, ...).
1409 * - encoding: Set by user.
1410 * - decoding: Set by user.
1411 * Setting this to STRICT or higher means the encoder and decoder will
1412 * generally do stupid things, whereas setting it to unofficial or lower
1413 * will mean the encoder might produce output that is not supported by all
1414 * spec-compliant decoders. Decoders don't differentiate between normal,
1415 * unofficial and experimental (that is, they always try to decode things
1416 * when they can) unless they are explicitly asked to behave stupidly
1417 * (=strictly conform to the specs)
1419 int strict_std_compliance;
1420 #define FF_COMPLIANCE_VERY_STRICT 2 ///< Strictly conform to an older more strict version of the spec or reference software.
1421 #define FF_COMPLIANCE_STRICT 1 ///< Strictly conform to all the things in the spec no matter what consequences.
1422 #define FF_COMPLIANCE_NORMAL 0
1423 #if FF_API_INOFFICIAL
1424 #define FF_COMPLIANCE_INOFFICIAL -1 ///< Allow inofficial extensions (deprecated - use FF_COMPLIANCE_UNOFFICIAL instead).
1426 #define FF_COMPLIANCE_UNOFFICIAL -1 ///< Allow unofficial extensions
1427 #define FF_COMPLIANCE_EXPERIMENTAL -2 ///< Allow nonstandardized experimental things.
1430 * qscale offset between IP and B-frames
1431 * - encoding: Set by user.
1432 * - decoding: unused
1434 float b_quant_offset;
1437 * Error recognization; higher values will detect more errors but may
1438 * misdetect some more or less valid parts as errors.
1439 * - encoding: unused
1440 * - decoding: Set by user.
1442 int error_recognition;
1443 #define FF_ER_CAREFUL 1
1444 #define FF_ER_COMPLIANT 2
1445 #define FF_ER_AGGRESSIVE 3
1446 #define FF_ER_VERY_AGGRESSIVE 4
1449 * Called at the beginning of each frame to get a buffer for it.
1450 * If pic.reference is set then the frame will be read later by libavcodec.
1451 * avcodec_align_dimensions2() should be used to find the required width and
1452 * height, as they normally need to be rounded up to the next multiple of 16.
1453 * if CODEC_CAP_DR1 is not set then get_buffer() must call
1454 * avcodec_default_get_buffer() instead of providing buffers allocated by
1456 * - encoding: unused
1457 * - decoding: Set by libavcodec, user can override.
1459 int (*get_buffer)(struct AVCodecContext *c, AVFrame *pic);
1462 * Called to release buffers which were allocated with get_buffer.
1463 * A released buffer can be reused in get_buffer().
1464 * pic.data[*] must be set to NULL.
1465 * - encoding: unused
1466 * - decoding: Set by libavcodec, user can override.
1468 void (*release_buffer)(struct AVCodecContext *c, AVFrame *pic);
1471 * Size of the frame reordering buffer in the decoder.
1472 * For MPEG-2 it is 1 IPB or 0 low delay IP.
1473 * - encoding: Set by libavcodec.
1474 * - decoding: Set by libavcodec.
1479 * number of bytes per packet if constant and known or 0
1480 * Used by some WAV based audio codecs.
1484 int parse_only; /* - decoding only: If true, only parsing is done
1485 (function avcodec_parse_frame()). The frame
1486 data is returned. Only MPEG codecs support this now. */
1489 * 0-> h263 quant 1-> mpeg quant
1490 * - encoding: Set by user.
1491 * - decoding: unused
1496 * pass1 encoding statistics output buffer
1497 * - encoding: Set by libavcodec.
1498 * - decoding: unused
1503 * pass2 encoding statistics input buffer
1504 * Concatenated stuff from stats_out of pass1 should be placed here.
1505 * - encoding: Allocated/set/freed by user.
1506 * - decoding: unused
1511 * ratecontrol qmin qmax limiting method
1512 * 0-> clipping, 1-> use a nice continous function to limit qscale wthin qmin/qmax.
1513 * - encoding: Set by user.
1514 * - decoding: unused
1522 * ratecontrol override, see RcOverride
1523 * - encoding: Allocated/set/freed by user.
1524 * - decoding: unused
1526 RcOverride *rc_override;
1527 int rc_override_count;
1530 * rate control equation
1531 * - encoding: Set by user
1532 * - decoding: unused
1538 * - encoding: Set by user.
1539 * - decoding: unused
1545 * - encoding: Set by user.
1546 * - decoding: unused
1551 * decoder bitstream buffer size
1552 * - encoding: Set by user.
1553 * - decoding: unused
1556 float rc_buffer_aggressivity;
1559 * qscale factor between P and I-frames
1560 * If > 0 then the last p frame quantizer will be used (q= lastp_q*factor+offset).
1561 * If < 0 then normal ratecontrol will be done (q= -normal_q*factor+offset).
1562 * - encoding: Set by user.
1563 * - decoding: unused
1565 float i_quant_factor;
1568 * qscale offset between P and I-frames
1569 * - encoding: Set by user.
1570 * - decoding: unused
1572 float i_quant_offset;
1575 * initial complexity for pass1 ratecontrol
1576 * - encoding: Set by user.
1577 * - decoding: unused
1579 float rc_initial_cplx;
1582 * DCT algorithm, see FF_DCT_* below
1583 * - encoding: Set by user.
1584 * - decoding: unused
1587 #define FF_DCT_AUTO 0
1588 #define FF_DCT_FASTINT 1
1589 #define FF_DCT_INT 2
1590 #define FF_DCT_MMX 3
1591 #define FF_DCT_MLIB 4
1592 #define FF_DCT_ALTIVEC 5
1593 #define FF_DCT_FAAN 6
1596 * luminance masking (0-> disabled)
1597 * - encoding: Set by user.
1598 * - decoding: unused
1603 * temporary complexity masking (0-> disabled)
1604 * - encoding: Set by user.
1605 * - decoding: unused
1607 float temporal_cplx_masking;
1610 * spatial complexity masking (0-> disabled)
1611 * - encoding: Set by user.
1612 * - decoding: unused
1614 float spatial_cplx_masking;
1617 * p block masking (0-> disabled)
1618 * - encoding: Set by user.
1619 * - decoding: unused
1624 * darkness masking (0-> disabled)
1625 * - encoding: Set by user.
1626 * - decoding: unused
1631 * IDCT algorithm, see FF_IDCT_* below.
1632 * - encoding: Set by user.
1633 * - decoding: Set by user.
1636 #define FF_IDCT_AUTO 0
1637 #define FF_IDCT_INT 1
1638 #define FF_IDCT_SIMPLE 2
1639 #define FF_IDCT_SIMPLEMMX 3
1640 #define FF_IDCT_LIBMPEG2MMX 4
1641 #define FF_IDCT_PS2 5
1642 #define FF_IDCT_MLIB 6
1643 #define FF_IDCT_ARM 7
1644 #define FF_IDCT_ALTIVEC 8
1645 #define FF_IDCT_SH4 9
1646 #define FF_IDCT_SIMPLEARM 10
1647 #define FF_IDCT_H264 11
1648 #define FF_IDCT_VP3 12
1649 #define FF_IDCT_IPP 13
1650 #define FF_IDCT_XVIDMMX 14
1651 #define FF_IDCT_CAVS 15
1652 #define FF_IDCT_SIMPLEARMV5TE 16
1653 #define FF_IDCT_SIMPLEARMV6 17
1654 #define FF_IDCT_SIMPLEVIS 18
1655 #define FF_IDCT_WMV2 19
1656 #define FF_IDCT_FAAN 20
1657 #define FF_IDCT_EA 21
1658 #define FF_IDCT_SIMPLENEON 22
1659 #define FF_IDCT_SIMPLEALPHA 23
1660 #define FF_IDCT_BINK 24
1664 * - encoding: Set by libavcodec.
1665 * - decoding: Set by user (or 0).
1669 * slice offsets in the frame in bytes
1670 * - encoding: Set/allocated by libavcodec.
1671 * - decoding: Set/allocated by user (or NULL).
1676 * error concealment flags
1677 * - encoding: unused
1678 * - decoding: Set by user.
1680 int error_concealment;
1681 #define FF_EC_GUESS_MVS 1
1682 #define FF_EC_DEBLOCK 2
1685 * dsp_mask could be add used to disable unwanted CPU features
1686 * CPU features (i.e. MMX, SSE. ...)
1688 * With the FORCE flag you may instead enable given CPU features.
1689 * (Dangerous: Usable in case of misdetection, improper usage however will
1690 * result into program crash.)
1695 #define FF_MM_FORCE AV_CPU_FLAG_FORCE
1696 #define FF_MM_MMX AV_CPU_FLAG_MMX
1697 #define FF_MM_3DNOW AV_CPU_FLAG_3DNOW
1698 #define FF_MM_MMXEXT AV_CPU_FLAG_MMX2
1699 #define FF_MM_MMX2 AV_CPU_FLAG_MMX2
1700 #define FF_MM_SSE AV_CPU_FLAG_SSE
1701 #define FF_MM_SSE2 AV_CPU_FLAG_SSE2
1702 #define FF_MM_SSE2SLOW AV_CPU_FLAG_SSE2SLOW
1703 #define FF_MM_3DNOWEXT AV_CPU_FLAG_3DNOWEXT
1704 #define FF_MM_SSE3 AV_CPU_FLAG_SSE3
1705 #define FF_MM_SSE3SLOW AV_CPU_FLAG_SSE3SLOW
1706 #define FF_MM_SSSE3 AV_CPU_FLAG_SSSE3
1707 #define FF_MM_SSE4 AV_CPU_FLAG_SSE4
1708 #define FF_MM_SSE42 AV_CPU_FLAG_SSE42
1709 #define FF_MM_IWMMXT AV_CPU_FLAG_IWMMXT
1710 #define FF_MM_ALTIVEC AV_CPU_FLAG_ALTIVEC
1714 * bits per sample/pixel from the demuxer (needed for huffyuv).
1715 * - encoding: Set by libavcodec.
1716 * - decoding: Set by user.
1718 int bits_per_coded_sample;
1721 * prediction method (needed for huffyuv)
1722 * - encoding: Set by user.
1723 * - decoding: unused
1725 int prediction_method;
1726 #define FF_PRED_LEFT 0
1727 #define FF_PRED_PLANE 1
1728 #define FF_PRED_MEDIAN 2
1731 * sample aspect ratio (0 if unknown)
1732 * That is the width of a pixel divided by the height of the pixel.
1733 * Numerator and denominator must be relatively prime and smaller than 256 for some video standards.
1734 * - encoding: Set by user.
1735 * - decoding: Set by libavcodec.
1737 AVRational sample_aspect_ratio;
1740 * the picture in the bitstream
1741 * - encoding: Set by libavcodec.
1742 * - decoding: Set by libavcodec.
1744 AVFrame *coded_frame;
1748 * - encoding: Set by user.
1749 * - decoding: Set by user.
1752 #define FF_DEBUG_PICT_INFO 1
1753 #define FF_DEBUG_RC 2
1754 #define FF_DEBUG_BITSTREAM 4
1755 #define FF_DEBUG_MB_TYPE 8
1756 #define FF_DEBUG_QP 16
1757 #define FF_DEBUG_MV 32
1758 #define FF_DEBUG_DCT_COEFF 0x00000040
1759 #define FF_DEBUG_SKIP 0x00000080
1760 #define FF_DEBUG_STARTCODE 0x00000100
1761 #define FF_DEBUG_PTS 0x00000200
1762 #define FF_DEBUG_ER 0x00000400
1763 #define FF_DEBUG_MMCO 0x00000800
1764 #define FF_DEBUG_BUGS 0x00001000
1765 #define FF_DEBUG_VIS_QP 0x00002000
1766 #define FF_DEBUG_VIS_MB_TYPE 0x00004000
1767 #define FF_DEBUG_BUFFERS 0x00008000
1771 * - encoding: Set by user.
1772 * - decoding: Set by user.
1775 #define FF_DEBUG_VIS_MV_P_FOR 0x00000001 //visualize forward predicted MVs of P frames
1776 #define FF_DEBUG_VIS_MV_B_FOR 0x00000002 //visualize forward predicted MVs of B frames
1777 #define FF_DEBUG_VIS_MV_B_BACK 0x00000004 //visualize backward predicted MVs of B frames
1781 * - encoding: Set by libavcodec if flags&CODEC_FLAG_PSNR.
1782 * - decoding: unused
1787 * minimum MB quantizer
1788 * - encoding: unused
1789 * - decoding: unused
1794 * maximum MB quantizer
1795 * - encoding: unused
1796 * - decoding: unused
1801 * motion estimation comparison function
1802 * - encoding: Set by user.
1803 * - decoding: unused
1807 * subpixel motion estimation comparison function
1808 * - encoding: Set by user.
1809 * - decoding: unused
1813 * macroblock comparison function (not supported yet)
1814 * - encoding: Set by user.
1815 * - decoding: unused
1819 * interlaced DCT comparison function
1820 * - encoding: Set by user.
1821 * - decoding: unused
1824 #define FF_CMP_SAD 0
1825 #define FF_CMP_SSE 1
1826 #define FF_CMP_SATD 2
1827 #define FF_CMP_DCT 3
1828 #define FF_CMP_PSNR 4
1829 #define FF_CMP_BIT 5
1831 #define FF_CMP_ZERO 7
1832 #define FF_CMP_VSAD 8
1833 #define FF_CMP_VSSE 9
1834 #define FF_CMP_NSSE 10
1835 #define FF_CMP_W53 11
1836 #define FF_CMP_W97 12
1837 #define FF_CMP_DCTMAX 13
1838 #define FF_CMP_DCT264 14
1839 #define FF_CMP_CHROMA 256
1842 * ME diamond size & shape
1843 * - encoding: Set by user.
1844 * - decoding: unused
1849 * amount of previous MV predictors (2a+1 x 2a+1 square)
1850 * - encoding: Set by user.
1851 * - decoding: unused
1853 int last_predictor_count;
1856 * prepass for motion estimation
1857 * - encoding: Set by user.
1858 * - decoding: unused
1863 * motion estimation prepass comparison function
1864 * - encoding: Set by user.
1865 * - decoding: unused
1870 * ME prepass diamond size & shape
1871 * - encoding: Set by user.
1872 * - decoding: unused
1878 * - encoding: Set by user.
1879 * - decoding: unused
1881 int me_subpel_quality;
1884 * callback to negotiate the pixelFormat
1885 * @param fmt is the list of formats which are supported by the codec,
1886 * it is terminated by -1 as 0 is a valid format, the formats are ordered by quality.
1887 * The first is always the native one.
1888 * @return the chosen format
1889 * - encoding: unused
1890 * - decoding: Set by user, if not set the native format will be chosen.
1892 enum PixelFormat (*get_format)(struct AVCodecContext *s, const enum PixelFormat * fmt);
1895 * DTG active format information (additional aspect ratio
1896 * information only used in DVB MPEG-2 transport streams)
1899 * - encoding: unused
1900 * - decoding: Set by decoder.
1902 int dtg_active_format;
1903 #define FF_DTG_AFD_SAME 8
1904 #define FF_DTG_AFD_4_3 9
1905 #define FF_DTG_AFD_16_9 10
1906 #define FF_DTG_AFD_14_9 11
1907 #define FF_DTG_AFD_4_3_SP_14_9 13
1908 #define FF_DTG_AFD_16_9_SP_14_9 14
1909 #define FF_DTG_AFD_SP_4_3 15
1912 * maximum motion estimation search range in subpel units
1913 * If 0 then no limit.
1915 * - encoding: Set by user.
1916 * - decoding: unused
1921 * intra quantizer bias
1922 * - encoding: Set by user.
1923 * - decoding: unused
1925 int intra_quant_bias;
1926 #define FF_DEFAULT_QUANT_BIAS 999999
1929 * inter quantizer bias
1930 * - encoding: Set by user.
1931 * - decoding: unused
1933 int inter_quant_bias;
1937 * - encoding: unused
1938 * - decoding: Which clrtable should be used for 8bit RGB images.
1939 * Tables have to be stored somewhere. FIXME
1944 * internal_buffer count
1945 * Don't touch, used by libavcodec default_get_buffer().
1947 int internal_buffer_count;
1951 * Don't touch, used by libavcodec default_get_buffer().
1953 void *internal_buffer;
1956 * Global quality for codecs which cannot change it per frame.
1957 * This should be proportional to MPEG-1/2/4 qscale.
1958 * - encoding: Set by user.
1959 * - decoding: unused
1963 #define FF_CODER_TYPE_VLC 0
1964 #define FF_CODER_TYPE_AC 1
1965 #define FF_CODER_TYPE_RAW 2
1966 #define FF_CODER_TYPE_RLE 3
1967 #define FF_CODER_TYPE_DEFLATE 4
1970 * - encoding: Set by user.
1971 * - decoding: unused
1977 * - encoding: Set by user.
1978 * - decoding: unused
1984 * - encoding: unused
1985 * - decoding: Set by user.
1987 uint8_t * (*realloc)(struct AVCodecContext *s, uint8_t *buf, int buf_size);
1992 * - encoding: unused
1993 * - decoding: Set by user.
1996 #define SLICE_FLAG_CODED_ORDER 0x0001 ///< draw_horiz_band() is called in coded order instead of display
1997 #define SLICE_FLAG_ALLOW_FIELD 0x0002 ///< allow draw_horiz_band() with field slices (MPEG2 field pics)
1998 #define SLICE_FLAG_ALLOW_PLANE 0x0004 ///< allow draw_horiz_band() with 1 component at a time (SVQ1)
2001 * XVideo Motion Acceleration
2002 * - encoding: forbidden
2003 * - decoding: set by decoder
2005 int xvmc_acceleration;
2008 * macroblock decision mode
2009 * - encoding: Set by user.
2010 * - decoding: unused
2013 #define FF_MB_DECISION_SIMPLE 0 ///< uses mb_cmp
2014 #define FF_MB_DECISION_BITS 1 ///< chooses the one which needs the fewest bits
2015 #define FF_MB_DECISION_RD 2 ///< rate distortion
2018 * custom intra quantization matrix
2019 * - encoding: Set by user, can be NULL.
2020 * - decoding: Set by libavcodec.
2022 uint16_t *intra_matrix;
2025 * custom inter quantization matrix
2026 * - encoding: Set by user, can be NULL.
2027 * - decoding: Set by libavcodec.
2029 uint16_t *inter_matrix;
2032 * fourcc from the AVI stream header (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A').
2033 * This is used to work around some encoder bugs.
2034 * - encoding: unused
2035 * - decoding: Set by user, will be converted to uppercase by libavcodec during init.
2037 unsigned int stream_codec_tag;
2040 * scene change detection threshold
2041 * 0 is default, larger means fewer detected scene changes.
2042 * - encoding: Set by user.
2043 * - decoding: unused
2045 int scenechange_threshold;
2048 * minimum Lagrange multipler
2049 * - encoding: Set by user.
2050 * - decoding: unused
2055 * maximum Lagrange multipler
2056 * - encoding: Set by user.
2057 * - decoding: unused
2061 #if FF_API_PALETTE_CONTROL
2063 * palette control structure
2064 * - encoding: ??? (no palette-enabled encoder yet)
2065 * - decoding: Set by user.
2067 struct AVPaletteControl *palctrl;
2071 * noise reduction strength
2072 * - encoding: Set by user.
2073 * - decoding: unused
2075 int noise_reduction;
2078 * Called at the beginning of a frame to get cr buffer for it.
2079 * Buffer type (size, hints) must be the same. libavcodec won't check it.
2080 * libavcodec will pass previous buffer in pic, function should return
2081 * same buffer or new buffer with old frame "painted" into it.
2082 * If pic.data[0] == NULL must behave like get_buffer().
2083 * if CODEC_CAP_DR1 is not set then reget_buffer() must call
2084 * avcodec_default_reget_buffer() instead of providing buffers allocated by
2086 * - encoding: unused
2087 * - decoding: Set by libavcodec, user can override.
2089 int (*reget_buffer)(struct AVCodecContext *c, AVFrame *pic);
2092 * Number of bits which should be loaded into the rc buffer before decoding starts.
2093 * - encoding: Set by user.
2094 * - decoding: unused
2096 int rc_initial_buffer_occupancy;
2100 * - encoding: Set by user.
2101 * - decoding: unused
2103 int inter_threshold;
2107 * - encoding: Set by user.
2108 * - decoding: Set by user.
2113 * Simulates errors in the bitstream to test error concealment.
2114 * - encoding: Set by user.
2115 * - decoding: unused
2120 * MP3 antialias algorithm, see FF_AA_* below.
2121 * - encoding: unused
2122 * - decoding: Set by user.
2125 #define FF_AA_AUTO 0
2126 #define FF_AA_FASTINT 1 //not implemented yet
2128 #define FF_AA_FLOAT 3
2130 * quantizer noise shaping
2131 * - encoding: Set by user.
2132 * - decoding: unused
2134 int quantizer_noise_shaping;
2138 * is used to decide how many independent tasks should be passed to execute()
2139 * - encoding: Set by user.
2140 * - decoding: Set by user.
2145 * The codec may call this to execute several independent things.
2146 * It will return only after finishing all tasks.
2147 * The user may replace this with some multithreaded implementation,
2148 * the default implementation will execute the parts serially.
2149 * @param count the number of things to execute
2150 * - encoding: Set by libavcodec, user can override.
2151 * - decoding: Set by libavcodec, user can override.
2153 int (*execute)(struct AVCodecContext *c, int (*func)(struct AVCodecContext *c2, void *arg), void *arg2, int *ret, int count, int size);
2157 * Can be used by execute() to store some per AVCodecContext stuff.
2158 * - encoding: set by execute()
2159 * - decoding: set by execute()
2161 void *thread_opaque;
2164 * Motion estimation threshold below which no motion estimation is
2165 * performed, but instead the user specified motion vectors are used.
2167 * - encoding: Set by user.
2168 * - decoding: unused
2173 * Macroblock threshold below which the user specified macroblock types will be used.
2174 * - encoding: Set by user.
2175 * - decoding: unused
2180 * precision of the intra DC coefficient - 8
2181 * - encoding: Set by user.
2182 * - decoding: unused
2184 int intra_dc_precision;
2187 * noise vs. sse weight for the nsse comparsion function
2188 * - encoding: Set by user.
2189 * - decoding: unused
2194 * Number of macroblock rows at the top which are skipped.
2195 * - encoding: unused
2196 * - decoding: Set by user.
2201 * Number of macroblock rows at the bottom which are skipped.
2202 * - encoding: unused
2203 * - decoding: Set by user.
2209 * - encoding: Set by user.
2210 * - decoding: Set by libavcodec.
2213 #define FF_PROFILE_UNKNOWN -99
2215 #define FF_PROFILE_AAC_MAIN 0
2216 #define FF_PROFILE_AAC_LOW 1
2217 #define FF_PROFILE_AAC_SSR 2
2218 #define FF_PROFILE_AAC_LTP 3
2220 #define FF_PROFILE_H264_BASELINE 66
2221 #define FF_PROFILE_H264_MAIN 77
2222 #define FF_PROFILE_H264_EXTENDED 88
2223 #define FF_PROFILE_H264_HIGH 100
2224 #define FF_PROFILE_H264_HIGH_10 110
2225 #define FF_PROFILE_H264_HIGH_422 122
2226 #define FF_PROFILE_H264_HIGH_444 244
2227 #define FF_PROFILE_H264_CAVLC_444 44
2231 * - encoding: Set by user.
2232 * - decoding: Set by libavcodec.
2235 #define FF_LEVEL_UNKNOWN -99
2238 * low resolution decoding, 1-> 1/2 size, 2->1/4 size
2239 * - encoding: unused
2240 * - decoding: Set by user.
2245 * Bitstream width / height, may be different from width/height if lowres
2246 * or other things are used.
2247 * - encoding: unused
2248 * - decoding: Set by user before init if known. Codec should override / dynamically change if needed.
2250 int coded_width, coded_height;
2253 * frame skip threshold
2254 * - encoding: Set by user.
2255 * - decoding: unused
2257 int frame_skip_threshold;
2261 * - encoding: Set by user.
2262 * - decoding: unused
2264 int frame_skip_factor;
2267 * frame skip exponent
2268 * - encoding: Set by user.
2269 * - decoding: unused
2274 * frame skip comparison function
2275 * - encoding: Set by user.
2276 * - decoding: unused
2281 * Border processing masking, raises the quantizer for mbs on the borders
2283 * - encoding: Set by user.
2284 * - decoding: unused
2286 float border_masking;
2289 * minimum MB lagrange multipler
2290 * - encoding: Set by user.
2291 * - decoding: unused
2296 * maximum MB lagrange multipler
2297 * - encoding: Set by user.
2298 * - decoding: unused
2304 * - encoding: Set by user.
2305 * - decoding: unused
2307 int me_penalty_compensation;
2311 * - encoding: unused
2312 * - decoding: Set by user.
2314 enum AVDiscard skip_loop_filter;
2318 * - encoding: unused
2319 * - decoding: Set by user.
2321 enum AVDiscard skip_idct;
2325 * - encoding: unused
2326 * - decoding: Set by user.
2328 enum AVDiscard skip_frame;
2332 * - encoding: Set by user.
2333 * - decoding: unused
2339 * - encoding: Set by user.
2340 * - decoding: unused
2345 * constant rate factor - quality-based VBR - values ~correspond to qps
2346 * - encoding: Set by user.
2347 * - decoding: unused
2352 * constant quantization parameter rate control method
2353 * - encoding: Set by user.
2354 * - decoding: unused
2360 * - encoding: Set by user.
2361 * - decoding: unused
2366 * number of reference frames
2367 * - encoding: Set by user.
2368 * - decoding: Set by lavc.
2373 * chroma qp offset from luma
2374 * - encoding: Set by user.
2375 * - decoding: unused
2380 * Influences how often B-frames are used.
2381 * - encoding: Set by user.
2382 * - decoding: unused
2387 * trellis RD quantization
2388 * - encoding: Set by user.
2389 * - decoding: unused
2394 * Reduce fluctuations in qp (before curve compression).
2395 * - encoding: Set by user.
2396 * - decoding: unused
2398 float complexityblur;
2401 * in-loop deblocking filter alphac0 parameter
2402 * alpha is in the range -6...6
2403 * - encoding: Set by user.
2404 * - decoding: unused
2409 * in-loop deblocking filter beta parameter
2410 * beta is in the range -6...6
2411 * - encoding: Set by user.
2412 * - decoding: unused
2417 * macroblock subpartition sizes to consider - p8x8, p4x4, b8x8, i8x8, i4x4
2418 * - encoding: Set by user.
2419 * - decoding: unused
2422 #define X264_PART_I4X4 0x001 /* Analyze i4x4 */
2423 #define X264_PART_I8X8 0x002 /* Analyze i8x8 (requires 8x8 transform) */
2424 #define X264_PART_P8X8 0x010 /* Analyze p16x8, p8x16 and p8x8 */
2425 #define X264_PART_P4X4 0x020 /* Analyze p8x4, p4x8, p4x4 */
2426 #define X264_PART_B8X8 0x100 /* Analyze b16x8, b8x16 and b8x8 */
2429 * direct MV prediction mode - 0 (none), 1 (spatial), 2 (temporal), 3 (auto)
2430 * - encoding: Set by user.
2431 * - decoding: unused
2436 * Audio cutoff bandwidth (0 means "automatic")
2437 * - encoding: Set by user.
2438 * - decoding: unused
2443 * Multiplied by qscale for each frame and added to scene_change_score.
2444 * - encoding: Set by user.
2445 * - decoding: unused
2447 int scenechange_factor;
2451 * Note: Value depends upon the compare function used for fullpel ME.
2452 * - encoding: Set by user.
2453 * - decoding: unused
2458 * Adjusts sensitivity of b_frame_strategy 1.
2459 * - encoding: Set by user.
2460 * - decoding: unused
2465 * - encoding: Set by user.
2466 * - decoding: unused
2468 int compression_level;
2469 #define FF_COMPRESSION_DEFAULT -1
2473 * Sets whether to use LPC mode - used by FLAC encoder.
2474 * - encoding: Set by user.
2475 * - decoding: unused
2476 * @deprecated Deprecated in favor of lpc_type and lpc_passes.
2482 * LPC coefficient precision - used by FLAC encoder
2483 * - encoding: Set by user.
2484 * - decoding: unused
2486 int lpc_coeff_precision;
2489 * - encoding: Set by user.
2490 * - decoding: unused
2492 int min_prediction_order;
2495 * - encoding: Set by user.
2496 * - decoding: unused
2498 int max_prediction_order;
2501 * search method for selecting prediction order
2502 * - encoding: Set by user.
2503 * - decoding: unused
2505 int prediction_order_method;
2508 * - encoding: Set by user.
2509 * - decoding: unused
2511 int min_partition_order;
2514 * - encoding: Set by user.
2515 * - decoding: unused
2517 int max_partition_order;
2520 * GOP timecode frame start number, in non drop frame format
2521 * - encoding: Set by user.
2522 * - decoding: unused
2524 int64_t timecode_frame_start;
2526 #if LIBAVCODEC_VERSION_MAJOR < 53
2528 * Decoder should decode to this many channels if it can (0 for default)
2529 * - encoding: unused
2530 * - decoding: Set by user.
2531 * @deprecated Deprecated in favor of request_channel_layout.
2533 int request_channels;
2537 * Percentage of dynamic range compression to be applied by the decoder.
2538 * The default value is 1.0, corresponding to full compression.
2539 * - encoding: unused
2540 * - decoding: Set by user.
2545 * opaque 64bit number (generally a PTS) that will be reordered and
2546 * output in AVFrame.reordered_opaque
2547 * - encoding: unused
2548 * - decoding: Set by user.
2550 int64_t reordered_opaque;
2553 * Bits per sample/pixel of internal libavcodec pixel/sample format.
2554 * This field is applicable only when sample_fmt is SAMPLE_FMT_S32.
2555 * - encoding: set by user.
2556 * - decoding: set by libavcodec.
2558 int bits_per_raw_sample;
2561 * Audio channel layout.
2562 * - encoding: set by user.
2563 * - decoding: set by libavcodec.
2565 int64_t channel_layout;
2568 * Request decoder to use this channel layout if it can (0 for default)
2569 * - encoding: unused
2570 * - decoding: Set by user.
2572 int64_t request_channel_layout;
2575 * Ratecontrol attempt to use, at maximum, <value> of what can be used without an underflow.
2576 * - encoding: Set by user.
2577 * - decoding: unused.
2579 float rc_max_available_vbv_use;
2582 * Ratecontrol attempt to use, at least, <value> times the amount needed to prevent a vbv overflow.
2583 * - encoding: Set by user.
2584 * - decoding: unused.
2586 float rc_min_vbv_overflow_use;
2589 * Hardware accelerator in use
2590 * - encoding: unused.
2591 * - decoding: Set by libavcodec
2593 struct AVHWAccel *hwaccel;
2596 * For some codecs, the time base is closer to the field rate than the frame rate.
2597 * Most notably, H.264 and MPEG-2 specify time_base as half of frame duration
2598 * if no telecine is used ...
2600 * Set to time_base ticks per frame. Default 1, e.g., H.264/MPEG-2 set it to 2.
2602 int ticks_per_frame;
2605 * Hardware accelerator context.
2606 * For some hardware accelerators, a global context needs to be
2607 * provided by the user. In that case, this holds display-dependent
2608 * data FFmpeg cannot instantiate itself. Please refer to the
2609 * FFmpeg HW accelerator documentation to know how to fill this
2610 * is. e.g. for VA API, this is a struct vaapi_context.
2611 * - encoding: unused
2612 * - decoding: Set by user
2614 void *hwaccel_context;
2617 * Chromaticity coordinates of the source primaries.
2618 * - encoding: Set by user
2619 * - decoding: Set by libavcodec
2621 enum AVColorPrimaries color_primaries;
2624 * Color Transfer Characteristic.
2625 * - encoding: Set by user
2626 * - decoding: Set by libavcodec
2628 enum AVColorTransferCharacteristic color_trc;
2631 * YUV colorspace type.
2632 * - encoding: Set by user
2633 * - decoding: Set by libavcodec
2635 enum AVColorSpace colorspace;
2638 * MPEG vs JPEG YUV range.
2639 * - encoding: Set by user
2640 * - decoding: Set by libavcodec
2642 enum AVColorRange color_range;
2645 * This defines the location of chroma samples.
2646 * - encoding: Set by user
2647 * - decoding: Set by libavcodec
2649 enum AVChromaLocation chroma_sample_location;
2652 * The codec may call this to execute several independent things.
2653 * It will return only after finishing all tasks.
2654 * The user may replace this with some multithreaded implementation,
2655 * the default implementation will execute the parts serially.
2656 * Also see avcodec_thread_init and e.g. the --enable-pthread configure option.
2657 * @param c context passed also to func
2658 * @param count the number of things to execute
2659 * @param arg2 argument passed unchanged to func
2660 * @param ret return values of executed functions, must have space for "count" values. May be NULL.
2661 * @param func function that will be called count times, with jobnr from 0 to count-1.
2662 * threadnr will be in the range 0 to c->thread_count-1 < MAX_THREADS and so that no
2663 * two instances of func executing at the same time will have the same threadnr.
2664 * @return always 0 currently, but code should handle a future improvement where when any call to func
2665 * returns < 0 no further calls to func may be done and < 0 is returned.
2666 * - encoding: Set by libavcodec, user can override.
2667 * - decoding: Set by libavcodec, user can override.
2669 int (*execute2)(struct AVCodecContext *c, int (*func)(struct AVCodecContext *c2, void *arg, int jobnr, int threadnr), void *arg2, int *ret, int count);
2672 * explicit P-frame weighted prediction analysis method
2674 * 1: fast blind weighting (one reference duplicate with -1 offset)
2675 * 2: smart weighting (full fade detection analysis)
2676 * - encoding: Set by user.
2677 * - decoding: unused
2679 int weighted_p_pred;
2684 * 1: Variance AQ (complexity mask)
2685 * 2: Auto-variance AQ (experimental)
2686 * - encoding: Set by user
2687 * - decoding: unused
2693 * Reduces blocking and blurring in flat and textured areas.
2694 * - encoding: Set by user
2695 * - decoding: unused
2701 * Strength of psychovisual optimization
2702 * - encoding: Set by user
2703 * - decoding: unused
2709 * Strength of psychovisual optimization
2710 * - encoding: Set by user
2711 * - decoding: unused
2717 * Number of frames for frametype and ratecontrol lookahead
2718 * - encoding: Set by user
2719 * - decoding: unused
2724 * Constant rate factor maximum
2725 * With CRF encoding mode and VBV restrictions enabled, prevents quality from being worse
2726 * than crf_max, even if doing so would violate VBV restrictions.
2727 * - encoding: Set by user.
2728 * - decoding: unused
2732 int log_level_offset;
2735 * Determines which LPC analysis algorithm to use.
2736 * - encoding: Set by user
2737 * - decoding: unused
2739 enum AVLPCType lpc_type;
2742 * Number of passes to use for Cholesky factorization during LPC analysis
2743 * - encoding: Set by user
2744 * - decoding: unused
2750 * Indicates number of picture subdivisions. Used for parallelized
2752 * - encoding: Set by user
2753 * - decoding: unused
2761 typedef struct AVCodec {
2763 * Name of the codec implementation.
2764 * The name is globally unique among encoders and among decoders (but an
2765 * encoder and a decoder can share the same name).
2766 * This is the primary way to find a codec from the user perspective.
2769 enum AVMediaType type;
2772 int (*init)(AVCodecContext *);
2773 int (*encode)(AVCodecContext *, uint8_t *buf, int buf_size, void *data);
2774 int (*close)(AVCodecContext *);
2775 int (*decode)(AVCodecContext *, void *outdata, int *outdata_size, AVPacket *avpkt);
2777 * Codec capabilities.
2781 struct AVCodec *next;
2784 * Will be called when seeking
2786 void (*flush)(AVCodecContext *);
2787 const AVRational *supported_framerates; ///< array of supported framerates, or NULL if any, array is terminated by {0,0}
2788 const enum PixelFormat *pix_fmts; ///< array of supported pixel formats, or NULL if unknown, array is terminated by -1
2790 * Descriptive name for the codec, meant to be more human readable than name.
2791 * You should use the NULL_IF_CONFIG_SMALL() macro to define it.
2793 const char *long_name;
2794 const int *supported_samplerates; ///< array of supported audio samplerates, or NULL if unknown, array is terminated by 0
2795 const enum SampleFormat *sample_fmts; ///< array of supported sample formats, or NULL if unknown, array is terminated by -1
2796 const int64_t *channel_layouts; ///< array of support channel layouts, or NULL if unknown. array is terminated by 0
2797 uint8_t max_lowres; ///< maximum value for lowres supported by the decoder
2798 AVClass *priv_class; ///< AVClass for the private context
2804 typedef struct AVHWAccel {
2806 * Name of the hardware accelerated codec.
2807 * The name is globally unique among encoders and among decoders (but an
2808 * encoder and a decoder can share the same name).
2813 * Type of codec implemented by the hardware accelerator.
2815 * See AVMEDIA_TYPE_xxx
2817 enum AVMediaType type;
2820 * Codec implemented by the hardware accelerator.
2827 * Supported pixel format.
2829 * Only hardware accelerated formats are supported here.
2831 enum PixelFormat pix_fmt;
2834 * Hardware accelerated codec capabilities.
2835 * see FF_HWACCEL_CODEC_CAP_*
2839 struct AVHWAccel *next;
2842 * Called at the beginning of each frame or field picture.
2844 * Meaningful frame information (codec specific) is guaranteed to
2845 * be parsed at this point. This function is mandatory.
2847 * Note that buf can be NULL along with buf_size set to 0.
2848 * Otherwise, this means the whole frame is available at this point.
2850 * @param avctx the codec context
2851 * @param buf the frame data buffer base
2852 * @param buf_size the size of the frame in bytes
2853 * @return zero if successful, a negative value otherwise
2855 int (*start_frame)(AVCodecContext *avctx, const uint8_t *buf, uint32_t buf_size);
2858 * Callback for each slice.
2860 * Meaningful slice information (codec specific) is guaranteed to
2861 * be parsed at this point. This function is mandatory.
2863 * @param avctx the codec context
2864 * @param buf the slice data buffer base
2865 * @param buf_size the size of the slice in bytes
2866 * @return zero if successful, a negative value otherwise
2868 int (*decode_slice)(AVCodecContext *avctx, const uint8_t *buf, uint32_t buf_size);
2871 * Called at the end of each frame or field picture.
2873 * The whole picture is parsed at this point and can now be sent
2874 * to the hardware accelerator. This function is mandatory.
2876 * @param avctx the codec context
2877 * @return zero if successful, a negative value otherwise
2879 int (*end_frame)(AVCodecContext *avctx);
2882 * Size of HW accelerator private data.
2884 * Private data is allocated with av_mallocz() before
2885 * AVCodecContext.get_buffer() and deallocated after
2886 * AVCodecContext.release_buffer().
2892 * four components are given, that's all.
2893 * the last component is alpha
2895 typedef struct AVPicture {
2897 int linesize[4]; ///< number of bytes per line
2900 #if FF_API_PALETTE_CONTROL
2903 * This structure defines a method for communicating palette changes
2904 * between and demuxer and a decoder.
2906 * @deprecated Use AVPacket to send palette changes instead.
2907 * This is totally broken.
2909 #define AVPALETTE_SIZE 1024
2910 #define AVPALETTE_COUNT 256
2911 typedef struct AVPaletteControl {
2913 /* Demuxer sets this to 1 to indicate the palette has changed;
2914 * decoder resets to 0. */
2915 int palette_changed;
2917 /* 4-byte ARGB palette entries, stored in native byte order; note that
2918 * the individual palette components should be on a 8-bit scale; if
2919 * the palette data comes from an IBM VGA native format, the component
2920 * data is probably 6 bits in size and needs to be scaled. */
2921 unsigned int palette[AVPALETTE_COUNT];
2923 } AVPaletteControl attribute_deprecated;
2926 enum AVSubtitleType {
2929 SUBTITLE_BITMAP, ///< A bitmap, pict will be set
2932 * Plain text, the text field must be set by the decoder and is
2933 * authoritative. ass and pict fields may contain approximations.
2938 * Formatted text, the ass field must be set by the decoder and is
2939 * authoritative. pict and text fields may contain approximations.
2944 typedef struct AVSubtitleRect {
2945 int x; ///< top left corner of pict, undefined when pict is not set
2946 int y; ///< top left corner of pict, undefined when pict is not set
2947 int w; ///< width of pict, undefined when pict is not set
2948 int h; ///< height of pict, undefined when pict is not set
2949 int nb_colors; ///< number of colors in pict, undefined when pict is not set
2952 * data+linesize for the bitmap of this subtitle.
2953 * can be set for text/ass as well once they where rendered
2956 enum AVSubtitleType type;
2958 char *text; ///< 0 terminated plain UTF-8 text
2961 * 0 terminated ASS/SSA compatible event line.
2962 * The pressentation of this is unaffected by the other values in this
2968 typedef struct AVSubtitle {
2969 uint16_t format; /* 0 = graphics */
2970 uint32_t start_display_time; /* relative to packet pts, in ms */
2971 uint32_t end_display_time; /* relative to packet pts, in ms */
2973 AVSubtitleRect **rects;
2974 int64_t pts; ///< Same as packet pts, in AV_TIME_BASE
2977 /* packet functions */
2980 * @deprecated use NULL instead
2982 attribute_deprecated void av_destruct_packet_nofree(AVPacket *pkt);
2985 * Default packet destructor.
2987 void av_destruct_packet(AVPacket *pkt);
2990 * Initialize optional fields of a packet with default values.
2994 void av_init_packet(AVPacket *pkt);
2997 * Allocate the payload of a packet and initialize its fields with
3001 * @param size wanted payload size
3002 * @return 0 if OK, AVERROR_xxx otherwise
3004 int av_new_packet(AVPacket *pkt, int size);
3007 * Reduce packet size, correctly zeroing padding
3010 * @param size new size
3012 void av_shrink_packet(AVPacket *pkt, int size);
3015 * @warning This is a hack - the packet memory allocation stuff is broken. The
3016 * packet is allocated if it was not really allocated.
3018 int av_dup_packet(AVPacket *pkt);
3023 * @param pkt packet to free
3025 void av_free_packet(AVPacket *pkt);
3029 struct ReSampleContext;
3030 struct AVResampleContext;
3032 typedef struct ReSampleContext ReSampleContext;
3034 #if FF_API_AUDIO_OLD
3036 * @deprecated Use av_audio_resample_init() instead.
3038 attribute_deprecated ReSampleContext *audio_resample_init(int output_channels, int input_channels,
3039 int output_rate, int input_rate);
3042 * Initialize audio resampling context
3044 * @param output_channels number of output channels
3045 * @param input_channels number of input channels
3046 * @param output_rate output sample rate
3047 * @param input_rate input sample rate
3048 * @param sample_fmt_out requested output sample format
3049 * @param sample_fmt_in input sample format
3050 * @param filter_length length of each FIR filter in the filterbank relative to the cutoff freq
3051 * @param log2_phase_count log2 of the number of entries in the polyphase filterbank
3052 * @param linear If 1 then the used FIR filter will be linearly interpolated
3053 between the 2 closest, if 0 the closest will be used
3054 * @param cutoff cutoff frequency, 1.0 corresponds to half the output sampling rate
3055 * @return allocated ReSampleContext, NULL if error occured
3057 ReSampleContext *av_audio_resample_init(int output_channels, int input_channels,
3058 int output_rate, int input_rate,
3059 enum SampleFormat sample_fmt_out,
3060 enum SampleFormat sample_fmt_in,
3061 int filter_length, int log2_phase_count,
3062 int linear, double cutoff);
3064 int audio_resample(ReSampleContext *s, short *output, short *input, int nb_samples);
3065 void audio_resample_close(ReSampleContext *s);
3069 * Initialize an audio resampler.
3070 * Note, if either rate is not an integer then simply scale both rates up so they are.
3071 * @param filter_length length of each FIR filter in the filterbank relative to the cutoff freq
3072 * @param log2_phase_count log2 of the number of entries in the polyphase filterbank
3073 * @param linear If 1 then the used FIR filter will be linearly interpolated
3074 between the 2 closest, if 0 the closest will be used
3075 * @param cutoff cutoff frequency, 1.0 corresponds to half the output sampling rate
3077 struct AVResampleContext *av_resample_init(int out_rate, int in_rate, int filter_length, int log2_phase_count, int linear, double cutoff);
3080 * Resample an array of samples using a previously configured context.
3081 * @param src an array of unconsumed samples
3082 * @param consumed the number of samples of src which have been consumed are returned here
3083 * @param src_size the number of unconsumed samples available
3084 * @param dst_size the amount of space in samples available in dst
3085 * @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.
3086 * @return the number of samples written in dst or -1 if an error occurred
3088 int av_resample(struct AVResampleContext *c, short *dst, short *src, int *consumed, int src_size, int dst_size, int update_ctx);
3092 * Compensate samplerate/timestamp drift. The compensation is done by changing
3093 * the resampler parameters, so no audible clicks or similar distortions occur
3094 * @param compensation_distance distance in output samples over which the compensation should be performed
3095 * @param sample_delta number of output samples which should be output less
3097 * example: av_resample_compensate(c, 10, 500)
3098 * here instead of 510 samples only 500 samples would be output
3100 * note, due to rounding the actual compensation might be slightly different,
3101 * especially if the compensation_distance is large and the in_rate used during init is small
3103 void av_resample_compensate(struct AVResampleContext *c, int sample_delta, int compensation_distance);
3104 void av_resample_close(struct AVResampleContext *c);
3107 * Allocate memory for a picture. Call avpicture_free to free it.
3109 * @param picture the picture to be filled in
3110 * @param pix_fmt the format of the picture
3111 * @param width the width of the picture
3112 * @param height the height of the picture
3113 * @return zero if successful, a negative value if not
3115 int avpicture_alloc(AVPicture *picture, enum PixelFormat pix_fmt, int width, int height);
3118 * Free a picture previously allocated by avpicture_alloc().
3120 * @param picture the AVPicture to be freed
3122 void avpicture_free(AVPicture *picture);
3125 * Fill in the AVPicture fields.
3126 * The fields of the given AVPicture are filled in by using the 'ptr' address
3127 * which points to the image data buffer. Depending on the specified picture
3128 * format, one or multiple image data pointers and line sizes will be set.
3129 * If a planar format is specified, several pointers will be set pointing to
3130 * the different picture planes and the line sizes of the different planes
3131 * will be stored in the lines_sizes array.
3132 * Call with ptr == NULL to get the required size for the ptr buffer.
3134 * @param picture AVPicture whose fields are to be filled in
3135 * @param ptr Buffer which will contain or contains the actual image data
3136 * @param pix_fmt The format in which the picture data is stored.
3137 * @param width the width of the image in pixels
3138 * @param height the height of the image in pixels
3139 * @return size of the image data in bytes
3141 int avpicture_fill(AVPicture *picture, uint8_t *ptr,
3142 enum PixelFormat pix_fmt, int width, int height);
3143 int avpicture_layout(const AVPicture* src, enum PixelFormat pix_fmt, int width, int height,
3144 unsigned char *dest, int dest_size);
3147 * Calculate the size in bytes that a picture of the given width and height
3148 * would occupy if stored in the given picture format.
3149 * Note that this returns the size of a compact representation as generated
3150 * by avpicture_layout, which can be smaller than the size required for e.g.
3153 * @param pix_fmt the given picture format
3154 * @param width the width of the image
3155 * @param height the height of the image
3156 * @return Image data size in bytes or -1 on error (e.g. too large dimensions).
3158 int avpicture_get_size(enum PixelFormat pix_fmt, int width, int height);
3159 void avcodec_get_chroma_sub_sample(enum PixelFormat pix_fmt, int *h_shift, int *v_shift);
3160 const char *avcodec_get_pix_fmt_name(enum PixelFormat pix_fmt);
3161 void avcodec_set_dimensions(AVCodecContext *s, int width, int height);
3163 #if LIBAVCODEC_VERSION_MAJOR < 53
3165 * Return the pixel format corresponding to the name name.
3167 * If there is no pixel format with name name, then look for a
3168 * pixel format with the name corresponding to the native endian
3170 * For example in a little-endian system, first look for "gray16",
3171 * then for "gray16le".
3173 * Finally if no pixel format has been found, return PIX_FMT_NONE.
3175 * @deprecated Deprecated in favor of av_get_pix_fmt().
3177 attribute_deprecated enum PixelFormat avcodec_get_pix_fmt(const char* name);
3181 * Return a value representing the fourCC code associated to the
3182 * pixel format pix_fmt, or 0 if no associated fourCC code can be
3185 unsigned int avcodec_pix_fmt_to_codec_tag(enum PixelFormat pix_fmt);
3188 * Put a string representing the codec tag codec_tag in buf.
3190 * @param buf_size size in bytes of buf
3191 * @return the length of the string that would have been generated if
3192 * enough space had been available, excluding the trailing null
3194 size_t av_get_codec_tag_string(char *buf, size_t buf_size, unsigned int codec_tag);
3196 #define FF_LOSS_RESOLUTION 0x0001 /**< loss due to resolution change */
3197 #define FF_LOSS_DEPTH 0x0002 /**< loss due to color depth change */
3198 #define FF_LOSS_COLORSPACE 0x0004 /**< loss due to color space conversion */
3199 #define FF_LOSS_ALPHA 0x0008 /**< loss of alpha bits */
3200 #define FF_LOSS_COLORQUANT 0x0010 /**< loss due to color quantization */
3201 #define FF_LOSS_CHROMA 0x0020 /**< loss of chroma (e.g. RGB to gray conversion) */
3204 * Compute what kind of losses will occur when converting from one specific
3205 * pixel format to another.
3206 * When converting from one pixel format to another, information loss may occur.
3207 * For example, when converting from RGB24 to GRAY, the color information will
3208 * be lost. Similarly, other losses occur when converting from some formats to
3209 * other formats. These losses can involve loss of chroma, but also loss of
3210 * resolution, loss of color depth, loss due to the color space conversion, loss
3211 * of the alpha bits or loss due to color quantization.
3212 * avcodec_get_fix_fmt_loss() informs you about the various types of losses
3213 * which will occur when converting from one pixel format to another.
3215 * @param[in] dst_pix_fmt destination pixel format
3216 * @param[in] src_pix_fmt source pixel format
3217 * @param[in] has_alpha Whether the source pixel format alpha channel is used.
3218 * @return Combination of flags informing you what kind of losses will occur.
3220 int avcodec_get_pix_fmt_loss(enum PixelFormat dst_pix_fmt, enum PixelFormat src_pix_fmt,
3224 * Find the best pixel format to convert to given a certain source pixel
3225 * format. When converting from one pixel format to another, information loss
3226 * may occur. For example, when converting from RGB24 to GRAY, the color
3227 * information will be lost. Similarly, other losses occur when converting from
3228 * some formats to other formats. avcodec_find_best_pix_fmt() searches which of
3229 * the given pixel formats should be used to suffer the least amount of loss.
3230 * The pixel formats from which it chooses one, are determined by the
3231 * pix_fmt_mask parameter.
3234 * src_pix_fmt = PIX_FMT_YUV420P;
3235 * pix_fmt_mask = (1 << PIX_FMT_YUV422P) || (1 << PIX_FMT_RGB24);
3236 * dst_pix_fmt = avcodec_find_best_pix_fmt(pix_fmt_mask, src_pix_fmt, alpha, &loss);
3239 * @param[in] pix_fmt_mask bitmask determining which pixel format to choose from
3240 * @param[in] src_pix_fmt source pixel format
3241 * @param[in] has_alpha Whether the source pixel format alpha channel is used.
3242 * @param[out] loss_ptr Combination of flags informing you what kind of losses will occur.
3243 * @return The best pixel format to convert to or -1 if none was found.
3245 enum PixelFormat avcodec_find_best_pix_fmt(int64_t pix_fmt_mask, enum PixelFormat src_pix_fmt,
3246 int has_alpha, int *loss_ptr);
3250 * Print in buf the string corresponding to the pixel format with
3251 * number pix_fmt, or an header if pix_fmt is negative.
3253 * @param[in] buf the buffer where to write the string
3254 * @param[in] buf_size the size of buf
3255 * @param[in] pix_fmt the number of the pixel format to print the corresponding info string, or
3256 * a negative value to print the corresponding header.
3257 * Meaningful values for obtaining a pixel format info vary from 0 to PIX_FMT_NB -1.
3259 void avcodec_pix_fmt_string (char *buf, int buf_size, enum PixelFormat pix_fmt);
3261 #define FF_ALPHA_TRANSP 0x0001 /* image has some totally transparent pixels */
3262 #define FF_ALPHA_SEMI_TRANSP 0x0002 /* image has some transparent pixels */
3265 * Tell if an image really has transparent alpha values.
3266 * @return ored mask of FF_ALPHA_xxx constants
3268 int img_get_alpha_info(const AVPicture *src,
3269 enum PixelFormat pix_fmt, int width, int height);
3271 /* deinterlace a picture */
3272 /* deinterlace - if not supported return -1 */
3273 int avpicture_deinterlace(AVPicture *dst, const AVPicture *src,
3274 enum PixelFormat pix_fmt, int width, int height);
3276 /* external high level API */
3279 * If c is NULL, returns the first registered codec,
3280 * if c is non-NULL, returns the next registered codec after c,
3281 * or NULL if c is the last one.
3283 AVCodec *av_codec_next(AVCodec *c);
3286 * Return the LIBAVCODEC_VERSION_INT constant.
3288 unsigned avcodec_version(void);
3291 * Return the libavcodec build-time configuration.
3293 const char *avcodec_configuration(void);
3296 * Return the libavcodec license.
3298 const char *avcodec_license(void);
3301 * Initialize libavcodec.
3303 * @warning This function must be called before any other libavcodec
3306 void avcodec_init(void);
3308 #if LIBAVCODEC_VERSION_MAJOR < 53
3310 * @deprecated Deprecated in favor of avcodec_register().
3312 attribute_deprecated void register_avcodec(AVCodec *codec);
3316 * Register the codec codec and initialize libavcodec.
3318 * @see avcodec_init()
3320 void avcodec_register(AVCodec *codec);
3323 * Find a registered encoder with a matching codec ID.
3325 * @param id CodecID of the requested encoder
3326 * @return An encoder if one was found, NULL otherwise.
3328 AVCodec *avcodec_find_encoder(enum CodecID id);
3331 * Find a registered encoder with the specified name.
3333 * @param name name of the requested encoder
3334 * @return An encoder if one was found, NULL otherwise.
3336 AVCodec *avcodec_find_encoder_by_name(const char *name);
3339 * Find a registered decoder with a matching codec ID.
3341 * @param id CodecID of the requested decoder
3342 * @return A decoder if one was found, NULL otherwise.
3344 AVCodec *avcodec_find_decoder(enum CodecID id);
3347 * Find a registered decoder with the specified name.
3349 * @param name name of the requested decoder
3350 * @return A decoder if one was found, NULL otherwise.
3352 AVCodec *avcodec_find_decoder_by_name(const char *name);
3353 void avcodec_string(char *buf, int buf_size, AVCodecContext *enc, int encode);
3356 * Set the fields of the given AVCodecContext to default values.
3358 * @param s The AVCodecContext of which the fields should be set to default values.
3360 void avcodec_get_context_defaults(AVCodecContext *s);
3362 /** THIS FUNCTION IS NOT YET PART OF THE PUBLIC API!
3363 * we WILL change its arguments and name a few times! */
3364 void avcodec_get_context_defaults2(AVCodecContext *s, enum AVMediaType);
3366 /** THIS FUNCTION IS NOT YET PART OF THE PUBLIC API!
3367 * we WILL change its arguments and name a few times! */
3368 int avcodec_get_context_defaults3(AVCodecContext *s, AVCodec *codec);
3371 * Allocate an AVCodecContext and set its fields to default values. The
3372 * resulting struct can be deallocated by simply calling av_free().
3374 * @return An AVCodecContext filled with default values or NULL on failure.
3375 * @see avcodec_get_context_defaults
3377 AVCodecContext *avcodec_alloc_context(void);
3379 /** THIS FUNCTION IS NOT YET PART OF THE PUBLIC API!
3380 * we WILL change its arguments and name a few times! */
3381 AVCodecContext *avcodec_alloc_context2(enum AVMediaType);
3383 /** THIS FUNCTION IS NOT YET PART OF THE PUBLIC API!
3384 * we WILL change its arguments and name a few times! */
3385 AVCodecContext *avcodec_alloc_context3(AVCodec *codec);
3388 * Copy the settings of the source AVCodecContext into the destination
3389 * AVCodecContext. The resulting destination codec context will be
3390 * unopened, i.e. you are required to call avcodec_open() before you
3391 * can use this AVCodecContext to decode/encode video/audio data.
3393 * @param dest target codec context, should be initialized with
3394 * avcodec_alloc_context(), but otherwise uninitialized
3395 * @param src source codec context
3396 * @return AVERROR() on error (e.g. memory allocation error), 0 on success
3398 int avcodec_copy_context(AVCodecContext *dest, const AVCodecContext *src);
3401 * Set the fields of the given AVFrame to default values.
3403 * @param pic The AVFrame of which the fields should be set to default values.
3405 void avcodec_get_frame_defaults(AVFrame *pic);
3408 * Allocate an AVFrame and set its fields to default values. The resulting
3409 * struct can be deallocated by simply calling av_free().
3411 * @return An AVFrame filled with default values or NULL on failure.
3412 * @see avcodec_get_frame_defaults
3414 AVFrame *avcodec_alloc_frame(void);
3416 int avcodec_default_get_buffer(AVCodecContext *s, AVFrame *pic);
3417 void avcodec_default_release_buffer(AVCodecContext *s, AVFrame *pic);
3418 int avcodec_default_reget_buffer(AVCodecContext *s, AVFrame *pic);
3421 * Return the amount of padding in pixels which the get_buffer callback must
3422 * provide around the edge of the image for codecs which do not have the
3423 * CODEC_FLAG_EMU_EDGE flag.
3425 * @return Required padding in pixels.
3427 unsigned avcodec_get_edge_width(void);
3429 * Modify width and height values so that they will result in a memory
3430 * buffer that is acceptable for the codec if you do not use any horizontal
3433 * May only be used if a codec with CODEC_CAP_DR1 has been opened.
3434 * If CODEC_FLAG_EMU_EDGE is not set, the dimensions must have been increased
3435 * according to avcodec_get_edge_width() before.
3437 void avcodec_align_dimensions(AVCodecContext *s, int *width, int *height);
3439 * Modify width and height values so that they will result in a memory
3440 * buffer that is acceptable for the codec if you also ensure that all
3441 * line sizes are a multiple of the respective linesize_align[i].
3443 * May only be used if a codec with CODEC_CAP_DR1 has been opened.
3444 * If CODEC_FLAG_EMU_EDGE is not set, the dimensions must have been increased
3445 * according to avcodec_get_edge_width() before.
3447 void avcodec_align_dimensions2(AVCodecContext *s, int *width, int *height,
3448 int linesize_align[4]);
3450 #if LIBAVCODEC_VERSION_MAJOR < 53
3452 * @deprecated Deprecated in favor of av_check_image_size().
3454 attribute_deprecated
3455 int avcodec_check_dimensions(void *av_log_ctx, unsigned int w, unsigned int h);
3458 enum PixelFormat avcodec_default_get_format(struct AVCodecContext *s, const enum PixelFormat * fmt);
3460 int avcodec_thread_init(AVCodecContext *s, int thread_count);
3461 void avcodec_thread_free(AVCodecContext *s);
3462 int avcodec_default_execute(AVCodecContext *c, int (*func)(AVCodecContext *c2, void *arg2),void *arg, int *ret, int count, int size);
3463 int avcodec_default_execute2(AVCodecContext *c, int (*func)(AVCodecContext *c2, void *arg2, int, int),void *arg, int *ret, int count);
3464 //FIXME func typedef
3467 * Initialize the AVCodecContext to use the given AVCodec. Prior to using this
3468 * function the context has to be allocated.
3470 * The functions avcodec_find_decoder_by_name(), avcodec_find_encoder_by_name(),
3471 * avcodec_find_decoder() and avcodec_find_encoder() provide an easy way for
3472 * retrieving a codec.
3474 * @warning This function is not thread safe!
3477 * avcodec_register_all();
3478 * codec = avcodec_find_decoder(CODEC_ID_H264);
3482 * context = avcodec_alloc_context();
3484 * if (avcodec_open(context, codec) < 0)
3488 * @param avctx The context which will be set up to use the given codec.
3489 * @param codec The codec to use within the context.
3490 * @return zero on success, a negative value on error
3491 * @see avcodec_alloc_context, avcodec_find_decoder, avcodec_find_encoder
3493 int avcodec_open(AVCodecContext *avctx, AVCodec *codec);
3495 #if FF_API_AUDIO_OLD
3497 * Decode an audio frame from buf into samples.
3498 * Wrapper function which calls avcodec_decode_audio3.
3500 * @deprecated Use avcodec_decode_audio3 instead.
3501 * @param avctx the codec context
3502 * @param[out] samples the output buffer
3503 * @param[in,out] frame_size_ptr the output buffer size in bytes
3504 * @param[in] buf the input buffer
3505 * @param[in] buf_size the input buffer size in bytes
3506 * @return On error a negative value is returned, otherwise the number of bytes
3507 * used or zero if no frame could be decompressed.
3509 attribute_deprecated int avcodec_decode_audio2(AVCodecContext *avctx, int16_t *samples,
3510 int *frame_size_ptr,
3511 const uint8_t *buf, int buf_size);
3515 * Decode the audio frame of size avpkt->size from avpkt->data into samples.
3516 * Some decoders may support multiple frames in a single AVPacket, such
3517 * decoders would then just decode the first frame. In this case,
3518 * avcodec_decode_audio3 has to be called again with an AVPacket that contains
3519 * the remaining data in order to decode the second frame etc.
3521 * could be outputted, frame_size_ptr is zero. Otherwise, it is the
3522 * decompressed frame size in bytes.
3524 * @warning You must set frame_size_ptr to the allocated size of the
3525 * output buffer before calling avcodec_decode_audio3().
3527 * @warning The input buffer must be FF_INPUT_BUFFER_PADDING_SIZE larger than
3528 * the actual read bytes because some optimized bitstream readers read 32 or 64
3529 * bits at once and could read over the end.
3531 * @warning The end of the input buffer avpkt->data should be set to 0 to ensure that
3532 * no overreading happens for damaged MPEG streams.
3534 * @note You might have to align the input buffer avpkt->data and output buffer
3535 * samples. The alignment requirements depend on the CPU: On some CPUs it isn't
3536 * necessary at all, on others it won't work at all if not aligned and on others
3537 * it will work but it will have an impact on performance.
3539 * In practice, avpkt->data should have 4 byte alignment at minimum and
3540 * samples should be 16 byte aligned unless the CPU doesn't need it
3541 * (AltiVec and SSE do).
3543 * @param avctx the codec context
3544 * @param[out] samples the output buffer, sample type in avctx->sample_fmt
3545 * @param[in,out] frame_size_ptr the output buffer size in bytes
3546 * @param[in] avpkt The input AVPacket containing the input buffer.
3547 * You can create such packet with av_init_packet() and by then setting
3548 * data and size, some decoders might in addition need other fields.
3549 * All decoders are designed to use the least fields possible though.
3550 * @return On error a negative value is returned, otherwise the number of bytes
3551 * used or zero if no frame data was decompressed (used) from the input AVPacket.
3553 int avcodec_decode_audio3(AVCodecContext *avctx, int16_t *samples,
3554 int *frame_size_ptr,
3557 #if FF_API_VIDEO_OLD
3559 * Decode a video frame from buf into picture.
3560 * Wrapper function which calls avcodec_decode_video2.
3562 * @deprecated Use avcodec_decode_video2 instead.
3563 * @param avctx the codec context
3564 * @param[out] picture The AVFrame in which the decoded video frame will be stored.
3565 * @param[in] buf the input buffer
3566 * @param[in] buf_size the size of the input buffer in bytes
3567 * @param[in,out] got_picture_ptr Zero if no frame could be decompressed, otherwise, it is nonzero.
3568 * @return On error a negative value is returned, otherwise the number of bytes
3569 * used or zero if no frame could be decompressed.
3571 attribute_deprecated int avcodec_decode_video(AVCodecContext *avctx, AVFrame *picture,
3572 int *got_picture_ptr,
3573 const uint8_t *buf, int buf_size);
3577 * Decode the video frame of size avpkt->size from avpkt->data into picture.
3578 * Some decoders may support multiple frames in a single AVPacket, such
3579 * decoders would then just decode the first frame.
3581 * @warning The input buffer must be FF_INPUT_BUFFER_PADDING_SIZE larger than
3582 * the actual read bytes because some optimized bitstream readers read 32 or 64
3583 * bits at once and could read over the end.
3585 * @warning The end of the input buffer buf should be set to 0 to ensure that
3586 * no overreading happens for damaged MPEG streams.
3588 * @note You might have to align the input buffer avpkt->data.
3589 * The alignment requirements depend on the CPU: on some CPUs it isn't
3590 * necessary at all, on others it won't work at all if not aligned and on others
3591 * it will work but it will have an impact on performance.
3593 * In practice, avpkt->data should have 4 byte alignment at minimum.
3595 * @note Some codecs have a delay between input and output, these need to be
3596 * fed with avpkt->data=NULL, avpkt->size=0 at the end to return the remaining frames.
3598 * @param avctx the codec context
3599 * @param[out] picture The AVFrame in which the decoded video frame will be stored.
3600 * Use avcodec_alloc_frame to get an AVFrame, the codec will
3601 * allocate memory for the actual bitmap.
3602 * with default get/release_buffer(), the decoder frees/reuses the bitmap as it sees fit.
3603 * with overridden get/release_buffer() (needs CODEC_CAP_DR1) the user decides into what buffer the decoder
3604 * decodes and the decoder tells the user once it does not need the data anymore,
3605 * the user app can at this point free/reuse/keep the memory as it sees fit.
3607 * @param[in] avpkt The input AVpacket containing the input buffer.
3608 * You can create such packet with av_init_packet() and by then setting
3609 * data and size, some decoders might in addition need other fields like
3610 * flags&AV_PKT_FLAG_KEY. All decoders are designed to use the least
3612 * @param[in,out] got_picture_ptr Zero if no frame could be decompressed, otherwise, it is nonzero.
3613 * @return On error a negative value is returned, otherwise the number of bytes
3614 * used or zero if no frame could be decompressed.
3616 int avcodec_decode_video2(AVCodecContext *avctx, AVFrame *picture,
3617 int *got_picture_ptr,
3620 #if FF_API_SUBTITLE_OLD
3621 /* Decode a subtitle message. Return -1 if error, otherwise return the
3622 * number of bytes used. If no subtitle could be decompressed,
3623 * got_sub_ptr is zero. Otherwise, the subtitle is stored in *sub. */
3624 attribute_deprecated int avcodec_decode_subtitle(AVCodecContext *avctx, AVSubtitle *sub,
3626 const uint8_t *buf, int buf_size);
3630 * Decode a subtitle message.
3631 * Return a negative value on error, otherwise return the number of bytes used.
3632 * If no subtitle could be decompressed, got_sub_ptr is zero.
3633 * Otherwise, the subtitle is stored in *sub.
3634 * Note that CODEC_CAP_DR1 is not available for subtitle codecs. This is for
3635 * simplicity, because the performance difference is expect to be negligible
3636 * and reusing a get_buffer written for video codecs would probably perform badly
3637 * due to a potentially very different allocation pattern.
3639 * @param avctx the codec context
3640 * @param[out] sub The AVSubtitle in which the decoded subtitle will be stored, must be
3641 freed with avsubtitle_free if *got_sub_ptr is set.
3642 * @param[in,out] got_sub_ptr Zero if no subtitle could be decompressed, otherwise, it is nonzero.
3643 * @param[in] avpkt The input AVPacket containing the input buffer.
3645 int avcodec_decode_subtitle2(AVCodecContext *avctx, AVSubtitle *sub,
3650 * Frees all allocated data in the given subtitle struct.
3652 * @param sub AVSubtitle to free.
3654 void avsubtitle_free(AVSubtitle *sub);
3656 int avcodec_parse_frame(AVCodecContext *avctx, uint8_t **pdata,
3658 uint8_t *buf, int buf_size);
3661 * Encode an audio frame from samples into buf.
3663 * @note The output buffer should be at least FF_MIN_BUFFER_SIZE bytes large.
3664 * However, for PCM audio the user will know how much space is needed
3665 * because it depends on the value passed in buf_size as described
3666 * below. In that case a lower value can be used.
3668 * @param avctx the codec context
3669 * @param[out] buf the output buffer
3670 * @param[in] buf_size the output buffer size
3671 * @param[in] samples the input buffer containing the samples
3672 * The number of samples read from this buffer is frame_size*channels,
3673 * both of which are defined in avctx.
3674 * For PCM audio the number of samples read from samples is equal to
3675 * buf_size * input_sample_size / output_sample_size.
3676 * @return On error a negative value is returned, on success zero or the number
3677 * of bytes used to encode the data read from the input buffer.
3679 int avcodec_encode_audio(AVCodecContext *avctx, uint8_t *buf, int buf_size,
3680 const short *samples);
3683 * Encode a video frame from pict into buf.
3684 * The input picture should be
3685 * stored using a specific format, namely avctx.pix_fmt.
3687 * @param avctx the codec context
3688 * @param[out] buf the output buffer for the bitstream of encoded frame
3689 * @param[in] buf_size the size of the output buffer in bytes
3690 * @param[in] pict the input picture to encode
3691 * @return On error a negative value is returned, on success zero or the number
3692 * of bytes used from the output buffer.
3694 int avcodec_encode_video(AVCodecContext *avctx, uint8_t *buf, int buf_size,
3695 const AVFrame *pict);
3696 int avcodec_encode_subtitle(AVCodecContext *avctx, uint8_t *buf, int buf_size,
3697 const AVSubtitle *sub);
3699 int avcodec_close(AVCodecContext *avctx);
3702 * Register all the codecs, parsers and bitstream filters which were enabled at
3703 * configuration time. If you do not call this function you can select exactly
3704 * which formats you want to support, by using the individual registration
3707 * @see avcodec_register
3708 * @see av_register_codec_parser
3709 * @see av_register_bitstream_filter
3711 void avcodec_register_all(void);
3714 * Flush buffers, should be called when seeking or when switching to a different stream.
3716 void avcodec_flush_buffers(AVCodecContext *avctx);
3718 void avcodec_default_free_buffers(AVCodecContext *s);
3720 /* misc useful functions */
3723 * Return a single letter to describe the given picture type pict_type.
3725 * @param[in] pict_type the picture type
3726 * @return A single character representing the picture type.
3728 char av_get_pict_type_char(int pict_type);
3731 * Return codec bits per sample.
3733 * @param[in] codec_id the codec
3734 * @return Number of bits per sample or zero if unknown for the given codec.
3736 int av_get_bits_per_sample(enum CodecID codec_id);
3739 * Return sample format bits per sample.
3741 * @param[in] sample_fmt the sample format
3742 * @return Number of bits per sample or zero if unknown for the given sample format.
3744 int av_get_bits_per_sample_format(enum SampleFormat sample_fmt);
3747 typedef struct AVCodecParserContext {
3749 struct AVCodecParser *parser;
3750 int64_t frame_offset; /* offset of the current frame */
3751 int64_t cur_offset; /* current offset
3752 (incremented by each av_parser_parse()) */
3753 int64_t next_frame_offset; /* offset of the next frame */
3755 int pict_type; /* XXX: Put it back in AVCodecContext. */
3757 * This field is used for proper frame duration computation in lavf.
3758 * It signals, how much longer the frame duration of the current frame
3759 * is compared to normal frame duration.
3761 * frame_duration = (1 + repeat_pict) * time_base
3763 * It is used by codecs like H.264 to display telecined material.
3765 int repeat_pict; /* XXX: Put it back in AVCodecContext. */
3766 int64_t pts; /* pts of the current frame */
3767 int64_t dts; /* dts of the current frame */
3772 int fetch_timestamp;
3774 #define AV_PARSER_PTS_NB 4
3775 int cur_frame_start_index;
3776 int64_t cur_frame_offset[AV_PARSER_PTS_NB];
3777 int64_t cur_frame_pts[AV_PARSER_PTS_NB];
3778 int64_t cur_frame_dts[AV_PARSER_PTS_NB];
3781 #define PARSER_FLAG_COMPLETE_FRAMES 0x0001
3782 #define PARSER_FLAG_ONCE 0x0002
3783 /// Set if the parser has a valid file offset
3784 #define PARSER_FLAG_FETCHED_OFFSET 0x0004
3786 int64_t offset; ///< byte offset from starting packet start
3787 int64_t cur_frame_end[AV_PARSER_PTS_NB];
3790 * Set by parser to 1 for key frames and 0 for non-key frames.
3791 * It is initialized to -1, so if the parser doesn't set this flag,
3792 * old-style fallback using FF_I_TYPE picture type as key frames
3798 * Time difference in stream time base units from the pts of this
3799 * packet to the point at which the output from the decoder has converged
3800 * independent from the availability of previous frames. That is, the
3801 * frames are virtually identical no matter if decoding started from
3802 * the very first frame or from this keyframe.
3803 * Is AV_NOPTS_VALUE if unknown.
3804 * This field is not the display duration of the current frame.
3805 * This field has no meaning if the packet does not have AV_PKT_FLAG_KEY
3808 * The purpose of this field is to allow seeking in streams that have no
3809 * keyframes in the conventional sense. It corresponds to the
3810 * recovery point SEI in H.264 and match_time_delta in NUT. It is also
3811 * essential for some types of subtitle streams to ensure that all
3812 * subtitles are correctly displayed after seeking.
3814 int64_t convergence_duration;
3816 // Timestamp generation support:
3818 * Synchronization point for start of timestamp generation.
3820 * Set to >0 for sync point, 0 for no sync point and <0 for undefined
3823 * For example, this corresponds to presence of H.264 buffering period
3829 * Offset of the current timestamp against last timestamp sync point in
3830 * units of AVCodecContext.time_base.
3832 * Set to INT_MIN when dts_sync_point unused. Otherwise, it must
3833 * contain a valid timestamp offset.
3835 * Note that the timestamp of sync point has usually a nonzero
3836 * dts_ref_dts_delta, which refers to the previous sync point. Offset of
3837 * the next frame after timestamp sync point will be usually 1.
3839 * For example, this corresponds to H.264 cpb_removal_delay.
3841 int dts_ref_dts_delta;
3844 * Presentation delay of current frame in units of AVCodecContext.time_base.
3846 * Set to INT_MIN when dts_sync_point unused. Otherwise, it must
3847 * contain valid non-negative timestamp delta (presentation time of a frame
3848 * must not lie in the past).
3850 * This delay represents the difference between decoding and presentation
3851 * time of the frame.
3853 * For example, this corresponds to H.264 dpb_output_delay.
3858 * Position of the packet in file.
3860 * Analogous to cur_frame_pts/dts
3862 int64_t cur_frame_pos[AV_PARSER_PTS_NB];
3865 * Byte position of currently parsed frame in stream.
3870 * Previous frame byte position.
3873 } AVCodecParserContext;
3875 typedef struct AVCodecParser {
3876 int codec_ids[5]; /* several codec IDs are permitted */
3878 int (*parser_init)(AVCodecParserContext *s);
3879 int (*parser_parse)(AVCodecParserContext *s,
3880 AVCodecContext *avctx,
3881 const uint8_t **poutbuf, int *poutbuf_size,
3882 const uint8_t *buf, int buf_size);
3883 void (*parser_close)(AVCodecParserContext *s);
3884 int (*split)(AVCodecContext *avctx, const uint8_t *buf, int buf_size);
3885 struct AVCodecParser *next;
3888 AVCodecParser *av_parser_next(AVCodecParser *c);
3890 void av_register_codec_parser(AVCodecParser *parser);
3891 AVCodecParserContext *av_parser_init(int codec_id);
3893 #if LIBAVCODEC_VERSION_MAJOR < 53
3894 attribute_deprecated
3895 int av_parser_parse(AVCodecParserContext *s,
3896 AVCodecContext *avctx,
3897 uint8_t **poutbuf, int *poutbuf_size,
3898 const uint8_t *buf, int buf_size,
3899 int64_t pts, int64_t dts);
3905 * @param s parser context.
3906 * @param avctx codec context.
3907 * @param poutbuf set to pointer to parsed buffer or NULL if not yet finished.
3908 * @param poutbuf_size set to size of parsed buffer or zero if not yet finished.
3909 * @param buf input buffer.
3910 * @param buf_size input length, to signal EOF, this should be 0 (so that the last frame can be output).
3911 * @param pts input presentation timestamp.
3912 * @param dts input decoding timestamp.
3913 * @param pos input byte position in stream.
3914 * @return the number of bytes of the input bitstream used.
3919 * len = av_parser_parse2(myparser, AVCodecContext, &data, &size,
3926 * decode_frame(data, size);
3930 int av_parser_parse2(AVCodecParserContext *s,
3931 AVCodecContext *avctx,
3932 uint8_t **poutbuf, int *poutbuf_size,
3933 const uint8_t *buf, int buf_size,
3934 int64_t pts, int64_t dts,
3937 int av_parser_change(AVCodecParserContext *s,
3938 AVCodecContext *avctx,
3939 uint8_t **poutbuf, int *poutbuf_size,
3940 const uint8_t *buf, int buf_size, int keyframe);
3941 void av_parser_close(AVCodecParserContext *s);
3944 typedef struct AVBitStreamFilterContext {
3946 struct AVBitStreamFilter *filter;
3947 AVCodecParserContext *parser;
3948 struct AVBitStreamFilterContext *next;
3949 } AVBitStreamFilterContext;
3952 typedef struct AVBitStreamFilter {
3955 int (*filter)(AVBitStreamFilterContext *bsfc,
3956 AVCodecContext *avctx, const char *args,
3957 uint8_t **poutbuf, int *poutbuf_size,
3958 const uint8_t *buf, int buf_size, int keyframe);
3959 void (*close)(AVBitStreamFilterContext *bsfc);
3960 struct AVBitStreamFilter *next;
3961 } AVBitStreamFilter;
3963 void av_register_bitstream_filter(AVBitStreamFilter *bsf);
3964 AVBitStreamFilterContext *av_bitstream_filter_init(const char *name);
3965 int av_bitstream_filter_filter(AVBitStreamFilterContext *bsfc,
3966 AVCodecContext *avctx, const char *args,
3967 uint8_t **poutbuf, int *poutbuf_size,
3968 const uint8_t *buf, int buf_size, int keyframe);
3969 void av_bitstream_filter_close(AVBitStreamFilterContext *bsf);
3971 AVBitStreamFilter *av_bitstream_filter_next(AVBitStreamFilter *f);
3976 * Reallocate the given block if it is not large enough, otherwise do nothing.
3980 void *av_fast_realloc(void *ptr, unsigned int *size, unsigned int min_size);
3983 * Allocate a buffer, reusing the given one if large enough.
3985 * Contrary to av_fast_realloc the current buffer contents might not be
3986 * preserved and on error the old buffer is freed, thus no special
3987 * handling to avoid memleaks is necessary.
3989 * @param ptr pointer to pointer to already allocated buffer, overwritten with pointer to new buffer
3990 * @param size size of the buffer *ptr points to
3991 * @param min_size minimum size of *ptr buffer after returning, *ptr will be NULL and
3992 * *size 0 if an error occurred.
3994 void av_fast_malloc(void *ptr, unsigned int *size, unsigned int min_size);
3996 #if LIBAVCODEC_VERSION_MAJOR < 53
3998 * @deprecated Deprecated in favor of av_image_copy().
4000 attribute_deprecated
4001 void av_picture_data_copy(uint8_t *dst_data[4], int dst_linesize[4],
4002 uint8_t *src_data[4], int src_linesize[4],
4003 enum PixelFormat pix_fmt, int width, int height);
4007 * Copy image src to dst. Wraps av_picture_data_copy() above.
4009 void av_picture_copy(AVPicture *dst, const AVPicture *src,
4010 enum PixelFormat pix_fmt, int width, int height);
4013 * Crop image top and left side.
4015 int av_picture_crop(AVPicture *dst, const AVPicture *src,
4016 enum PixelFormat pix_fmt, int top_band, int left_band);
4021 int av_picture_pad(AVPicture *dst, const AVPicture *src, int height, int width, enum PixelFormat pix_fmt,
4022 int padtop, int padbottom, int padleft, int padright, int *color);
4025 * Encode extradata length to a buffer. Used by xiph codecs.
4027 * @param s buffer to write to; must be at least (v/255+1) bytes long
4028 * @param v size of extradata in bytes
4029 * @return number of bytes written to the buffer.
4031 unsigned int av_xiphlacing(unsigned char *s, unsigned int v);
4033 #if LIBAVCODEC_VERSION_MAJOR < 53
4035 * Parse str and put in width_ptr and height_ptr the detected values.
4037 * @deprecated Deprecated in favor of av_parse_video_size().
4039 attribute_deprecated int av_parse_video_frame_size(int *width_ptr, int *height_ptr, const char *str);
4042 * Parse str and store the detected values in *frame_rate.
4044 * @deprecated Deprecated in favor of av_parse_video_rate().
4046 attribute_deprecated int av_parse_video_frame_rate(AVRational *frame_rate, const char *str);
4050 * Logs a generic warning message about a missing feature. This function is
4051 * intended to be used internally by FFmpeg (libavcodec, libavformat, etc.)
4052 * only, and would normally not be used by applications.
4053 * @param[in] avc a pointer to an arbitrary struct of which the first field is
4054 * a pointer to an AVClass struct
4055 * @param[in] feature string containing the name of the missing feature
4056 * @param[in] want_sample indicates if samples are wanted which exhibit this feature.
4057 * If want_sample is non-zero, additional verbage will be added to the log
4058 * message which tells the user how to report samples to the development
4061 void av_log_missing_feature(void *avc, const char *feature, int want_sample);
4064 * Log a generic warning message asking for a sample. This function is
4065 * intended to be used internally by FFmpeg (libavcodec, libavformat, etc.)
4066 * only, and would normally not be used by applications.
4067 * @param[in] avc a pointer to an arbitrary struct of which the first field is
4068 * a pointer to an AVClass struct
4069 * @param[in] msg string containing an optional message, or NULL if no message
4071 void av_log_ask_for_sample(void *avc, const char *msg);
4074 * Register the hardware accelerator hwaccel.
4076 void av_register_hwaccel(AVHWAccel *hwaccel);
4079 * If hwaccel is NULL, returns the first registered hardware accelerator,
4080 * if hwaccel is non-NULL, returns the next registered hardware accelerator
4081 * after hwaccel, or NULL if hwaccel is the last one.
4083 AVHWAccel *av_hwaccel_next(AVHWAccel *hwaccel);
4087 * Lock operation used by lockmgr
4090 AV_LOCK_CREATE, ///< Create a mutex
4091 AV_LOCK_OBTAIN, ///< Lock the mutex
4092 AV_LOCK_RELEASE, ///< Unlock the mutex
4093 AV_LOCK_DESTROY, ///< Free mutex resources
4097 * Register a user provided lock manager supporting the operations
4098 * specified by AVLockOp. mutex points to a (void *) where the
4099 * lockmgr should store/get a pointer to a user allocated mutex. It's
4100 * NULL upon AV_LOCK_CREATE and != NULL for all other ops.
4102 * @param cb User defined callback. Note: FFmpeg may invoke calls to this
4103 * callback during the call to av_lockmgr_register().
4104 * Thus, the application must be prepared to handle that.
4105 * If cb is set to NULL the lockmgr will be unregistered.
4106 * Also note that during unregistration the previously registered
4107 * lockmgr callback may also be invoked.
4109 int av_lockmgr_register(int (*cb)(void **mutex, enum AVLockOp op));
4111 #endif /* AVCODEC_AVCODEC_H */