2 * copyright (c) 2001 Fabrice Bellard
4 * This file is part of FFmpeg.
6 * FFmpeg is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
11 * FFmpeg is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with FFmpeg; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21 #ifndef AVCODEC_AVCODEC_H
22 #define AVCODEC_AVCODEC_H
30 #include "libavutil/avutil.h"
31 #include "libavutil/cpu.h"
33 #define LIBAVCODEC_VERSION_MAJOR 52
34 #define LIBAVCODEC_VERSION_MINOR 91
35 #define LIBAVCODEC_VERSION_MICRO 1
37 #define LIBAVCODEC_VERSION_INT AV_VERSION_INT(LIBAVCODEC_VERSION_MAJOR, \
38 LIBAVCODEC_VERSION_MINOR, \
39 LIBAVCODEC_VERSION_MICRO)
40 #define LIBAVCODEC_VERSION AV_VERSION(LIBAVCODEC_VERSION_MAJOR, \
41 LIBAVCODEC_VERSION_MINOR, \
42 LIBAVCODEC_VERSION_MICRO)
43 #define LIBAVCODEC_BUILD LIBAVCODEC_VERSION_INT
45 #define LIBAVCODEC_IDENT "Lavc" AV_STRINGIFY(LIBAVCODEC_VERSION)
48 * Those FF_API_* defines are not part of public API.
49 * They may change, break or disappear at any time.
51 #ifndef FF_API_PALETTE_CONTROL
52 #define FF_API_PALETTE_CONTROL (LIBAVCODEC_VERSION_MAJOR < 54)
54 #ifndef FF_API_MM_FLAGS
55 #define FF_API_MM_FLAGS (LIBAVCODEC_VERSION_MAJOR < 53)
57 #ifndef FF_API_OPT_SHOW
58 #define FF_API_OPT_SHOW (LIBAVCODEC_VERSION_MAJOR < 53)
60 #ifndef FF_API_AUDIO_OLD
61 #define FF_API_AUDIO_OLD (LIBAVCODEC_VERSION_MAJOR < 53)
63 #ifndef FF_API_VIDEO_OLD
64 #define FF_API_VIDEO_OLD (LIBAVCODEC_VERSION_MAJOR < 53)
66 #ifndef FF_API_SUBTITLE_OLD
67 #define FF_API_SUBTITLE_OLD (LIBAVCODEC_VERSION_MAJOR < 53)
70 #define AV_NOPTS_VALUE INT64_C(0x8000000000000000)
71 #define AV_TIME_BASE 1000000
72 #define AV_TIME_BASE_Q (AVRational){1, AV_TIME_BASE}
75 * Identify the syntax and semantics of the bitstream.
76 * The principle is roughly:
77 * Two decoders with the same ID can decode the same streams.
78 * Two encoders with the same ID can encode compatible streams.
79 * There may be slight deviations from the principle due to implementation
82 * If you add a codec ID to this list, add it so that
83 * 1. no value of a existing codec ID changes (that would break ABI),
84 * 2. it is as close as possible to similar codecs.
91 CODEC_ID_MPEG2VIDEO, ///< preferred ID for MPEG-1/2 video decoding
92 CODEC_ID_MPEG2VIDEO_XVMC,
129 CODEC_ID_INTERPLAY_VIDEO,
141 CODEC_ID_TRUEMOTION1,
152 #if LIBAVCODEC_VERSION_MAJOR < 53
171 CODEC_ID_TRUEMOTION2,
188 CODEC_ID_DSICINVIDEO,
189 CODEC_ID_TIERTEXSEQVIDEO,
198 CODEC_ID_BETHSOFTVID,
216 CODEC_ID_MOTIONPIXELS,
234 CODEC_ID_IFF_BYTERUN1,
244 /* various PCM "codecs" */
245 CODEC_ID_PCM_S16LE= 0x10000,
261 CODEC_ID_PCM_S24DAUD,
263 CODEC_ID_PCM_S16LE_PLANAR,
271 /* various ADPCM codecs */
272 CODEC_ID_ADPCM_IMA_QT= 0x11000,
273 CODEC_ID_ADPCM_IMA_WAV,
274 CODEC_ID_ADPCM_IMA_DK3,
275 CODEC_ID_ADPCM_IMA_DK4,
276 CODEC_ID_ADPCM_IMA_WS,
277 CODEC_ID_ADPCM_IMA_SMJPEG,
286 CODEC_ID_ADPCM_YAMAHA,
287 CODEC_ID_ADPCM_SBPRO_4,
288 CODEC_ID_ADPCM_SBPRO_3,
289 CODEC_ID_ADPCM_SBPRO_2,
291 CODEC_ID_ADPCM_IMA_AMV,
292 CODEC_ID_ADPCM_EA_R1,
293 CODEC_ID_ADPCM_EA_R3,
294 CODEC_ID_ADPCM_EA_R2,
295 CODEC_ID_ADPCM_IMA_EA_SEAD,
296 CODEC_ID_ADPCM_IMA_EA_EACS,
297 CODEC_ID_ADPCM_EA_XAS,
298 CODEC_ID_ADPCM_EA_MAXIS_XA,
299 CODEC_ID_ADPCM_IMA_ISS,
303 CODEC_ID_AMR_NB= 0x12000,
306 /* RealAudio codecs*/
307 CODEC_ID_RA_144= 0x13000,
310 /* various DPCM codecs */
311 CODEC_ID_ROQ_DPCM= 0x14000,
312 CODEC_ID_INTERPLAY_DPCM,
317 CODEC_ID_MP2= 0x15000,
318 CODEC_ID_MP3, ///< preferred ID for decoding MPEG audio layer 1, 2 or 3
336 CODEC_ID_WESTWOOD_SND1,
337 CODEC_ID_GSM, ///< as in Berlin toast format
345 CODEC_ID_DSICINAUDIO,
349 CODEC_ID_GSM_MS, /* as found in WAV */
358 CODEC_ID_WMALOSSLESS,
367 CODEC_ID_BINKAUDIO_RDFT,
368 CODEC_ID_BINKAUDIO_DCT,
370 /* subtitle codecs */
371 CODEC_ID_DVD_SUBTITLE= 0x17000,
372 CODEC_ID_DVB_SUBTITLE,
373 CODEC_ID_TEXT, ///< raw UTF-8 text
377 CODEC_ID_HDMV_PGS_SUBTITLE,
378 CODEC_ID_DVB_TELETEXT,
381 /* other specific kind of codecs (generally used for attachments) */
382 CODEC_ID_TTF= 0x18000,
384 CODEC_ID_PROBE= 0x19000, ///< codec_id is not known (like CODEC_ID_NONE) but lavf should attempt to identify it
386 CODEC_ID_MPEG2TS= 0x20000, /**< _FAKE_ codec to indicate a raw MPEG-2 TS
387 * stream (only used by libavformat) */
390 #if LIBAVCODEC_VERSION_MAJOR < 53
391 #define CodecType AVMediaType
393 #define CODEC_TYPE_UNKNOWN AVMEDIA_TYPE_UNKNOWN
394 #define CODEC_TYPE_VIDEO AVMEDIA_TYPE_VIDEO
395 #define CODEC_TYPE_AUDIO AVMEDIA_TYPE_AUDIO
396 #define CODEC_TYPE_DATA AVMEDIA_TYPE_DATA
397 #define CODEC_TYPE_SUBTITLE AVMEDIA_TYPE_SUBTITLE
398 #define CODEC_TYPE_ATTACHMENT AVMEDIA_TYPE_ATTACHMENT
399 #define CODEC_TYPE_NB AVMEDIA_TYPE_NB
403 * all in native-endian format
406 SAMPLE_FMT_NONE = -1,
407 SAMPLE_FMT_U8, ///< unsigned 8 bits
408 SAMPLE_FMT_S16, ///< signed 16 bits
409 SAMPLE_FMT_S32, ///< signed 32 bits
410 SAMPLE_FMT_FLT, ///< float
411 SAMPLE_FMT_DBL, ///< double
412 SAMPLE_FMT_NB ///< Number of sample formats. DO NOT USE if dynamically linking to libavcodec
415 /* Audio channel masks */
416 #define CH_FRONT_LEFT 0x00000001
417 #define CH_FRONT_RIGHT 0x00000002
418 #define CH_FRONT_CENTER 0x00000004
419 #define CH_LOW_FREQUENCY 0x00000008
420 #define CH_BACK_LEFT 0x00000010
421 #define CH_BACK_RIGHT 0x00000020
422 #define CH_FRONT_LEFT_OF_CENTER 0x00000040
423 #define CH_FRONT_RIGHT_OF_CENTER 0x00000080
424 #define CH_BACK_CENTER 0x00000100
425 #define CH_SIDE_LEFT 0x00000200
426 #define CH_SIDE_RIGHT 0x00000400
427 #define CH_TOP_CENTER 0x00000800
428 #define CH_TOP_FRONT_LEFT 0x00001000
429 #define CH_TOP_FRONT_CENTER 0x00002000
430 #define CH_TOP_FRONT_RIGHT 0x00004000
431 #define CH_TOP_BACK_LEFT 0x00008000
432 #define CH_TOP_BACK_CENTER 0x00010000
433 #define CH_TOP_BACK_RIGHT 0x00020000
434 #define CH_STEREO_LEFT 0x20000000 ///< Stereo downmix.
435 #define CH_STEREO_RIGHT 0x40000000 ///< See CH_STEREO_LEFT.
437 /** Channel mask value used for AVCodecContext.request_channel_layout
438 to indicate that the user requests the channel order of the decoder output
439 to be the native codec channel order. */
440 #define CH_LAYOUT_NATIVE 0x8000000000000000LL
442 /* Audio channel convenience macros */
443 #define CH_LAYOUT_MONO (CH_FRONT_CENTER)
444 #define CH_LAYOUT_STEREO (CH_FRONT_LEFT|CH_FRONT_RIGHT)
445 #define CH_LAYOUT_2_1 (CH_LAYOUT_STEREO|CH_BACK_CENTER)
446 #define CH_LAYOUT_SURROUND (CH_LAYOUT_STEREO|CH_FRONT_CENTER)
447 #define CH_LAYOUT_4POINT0 (CH_LAYOUT_SURROUND|CH_BACK_CENTER)
448 #define CH_LAYOUT_2_2 (CH_LAYOUT_STEREO|CH_SIDE_LEFT|CH_SIDE_RIGHT)
449 #define CH_LAYOUT_QUAD (CH_LAYOUT_STEREO|CH_BACK_LEFT|CH_BACK_RIGHT)
450 #define CH_LAYOUT_5POINT0 (CH_LAYOUT_SURROUND|CH_SIDE_LEFT|CH_SIDE_RIGHT)
451 #define CH_LAYOUT_5POINT1 (CH_LAYOUT_5POINT0|CH_LOW_FREQUENCY)
452 #define CH_LAYOUT_5POINT0_BACK (CH_LAYOUT_SURROUND|CH_BACK_LEFT|CH_BACK_RIGHT)
453 #define CH_LAYOUT_5POINT1_BACK (CH_LAYOUT_5POINT0_BACK|CH_LOW_FREQUENCY)
454 #define CH_LAYOUT_7POINT0 (CH_LAYOUT_5POINT0|CH_BACK_LEFT|CH_BACK_RIGHT)
455 #define CH_LAYOUT_7POINT1 (CH_LAYOUT_5POINT1|CH_BACK_LEFT|CH_BACK_RIGHT)
456 #define CH_LAYOUT_7POINT1_WIDE (CH_LAYOUT_5POINT1_BACK|\
457 CH_FRONT_LEFT_OF_CENTER|CH_FRONT_RIGHT_OF_CENTER)
458 #define CH_LAYOUT_STEREO_DOWNMIX (CH_STEREO_LEFT|CH_STEREO_RIGHT)
461 #define AVCODEC_MAX_AUDIO_FRAME_SIZE 192000 // 1 second of 48khz 32bit audio
464 * Required number of additionally allocated bytes at the end of the input bitstream for decoding.
465 * This is mainly needed because some optimized bitstream readers read
466 * 32 or 64 bit at once and could read over the end.<br>
467 * Note: If the first 23 bits of the additional bytes are not 0, then damaged
468 * MPEG bitstreams could cause overread and segfault.
470 #define FF_INPUT_BUFFER_PADDING_SIZE 8
473 * minimum encoding buffer size
474 * Used to avoid some checks during header writing.
476 #define FF_MIN_BUFFER_SIZE 16384
480 * motion estimation type.
483 ME_ZERO = 1, ///< no search, that is use 0,0 vector whenever one is needed
487 ME_EPZS, ///< enhanced predictive zonal search
488 ME_X1, ///< reserved for experiments
489 ME_HEX, ///< hexagon based search
490 ME_UMH, ///< uneven multi-hexagon search
491 ME_ITER, ///< iterative search
492 ME_TESA, ///< transformed exhaustive search algorithm
496 /* We leave some space between them for extensions (drop some
497 * keyframes for intra-only or drop just some bidir frames). */
498 AVDISCARD_NONE =-16, ///< discard nothing
499 AVDISCARD_DEFAULT= 0, ///< discard useless packets like 0 size packets in avi
500 AVDISCARD_NONREF = 8, ///< discard all non reference
501 AVDISCARD_BIDIR = 16, ///< discard all bidirectional frames
502 AVDISCARD_NONKEY = 32, ///< discard all frames except keyframes
503 AVDISCARD_ALL = 48, ///< discard all
506 enum AVColorPrimaries{
507 AVCOL_PRI_BT709 =1, ///< also ITU-R BT1361 / IEC 61966-2-4 / SMPTE RP177 Annex B
508 AVCOL_PRI_UNSPECIFIED=2,
510 AVCOL_PRI_BT470BG =5, ///< also ITU-R BT601-6 625 / ITU-R BT1358 625 / ITU-R BT1700 625 PAL & SECAM
511 AVCOL_PRI_SMPTE170M =6, ///< also ITU-R BT601-6 525 / ITU-R BT1358 525 / ITU-R BT1700 NTSC
512 AVCOL_PRI_SMPTE240M =7, ///< functionally identical to above
514 AVCOL_PRI_NB , ///< Not part of ABI
517 enum AVColorTransferCharacteristic{
518 AVCOL_TRC_BT709 =1, ///< also ITU-R BT1361
519 AVCOL_TRC_UNSPECIFIED=2,
520 AVCOL_TRC_GAMMA22 =4, ///< also ITU-R BT470M / ITU-R BT1700 625 PAL & SECAM
521 AVCOL_TRC_GAMMA28 =5, ///< also ITU-R BT470BG
522 AVCOL_TRC_NB , ///< Not part of ABI
527 AVCOL_SPC_BT709 =1, ///< also ITU-R BT1361 / IEC 61966-2-4 xvYCC709 / SMPTE RP177 Annex B
528 AVCOL_SPC_UNSPECIFIED=2,
530 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
531 AVCOL_SPC_SMPTE170M =6, ///< also ITU-R BT601-6 525 / ITU-R BT1358 525 / ITU-R BT1700 NTSC / functionally identical to above
532 AVCOL_SPC_SMPTE240M =7,
533 AVCOL_SPC_NB , ///< Not part of ABI
537 AVCOL_RANGE_UNSPECIFIED=0,
538 AVCOL_RANGE_MPEG =1, ///< the normal 219*2^(n-8) "MPEG" YUV ranges
539 AVCOL_RANGE_JPEG =2, ///< the normal 2^n-1 "JPEG" YUV ranges
540 AVCOL_RANGE_NB , ///< Not part of ABI
544 * X X 3 4 X X are luma samples,
545 * 1 2 1-6 are possible chroma positions
546 * X X 5 6 X 0 is undefined/unknown position
548 enum AVChromaLocation{
549 AVCHROMA_LOC_UNSPECIFIED=0,
550 AVCHROMA_LOC_LEFT =1, ///< mpeg2/4, h264 default
551 AVCHROMA_LOC_CENTER =2, ///< mpeg1, jpeg, h263
552 AVCHROMA_LOC_TOPLEFT =3, ///< DV
554 AVCHROMA_LOC_BOTTOMLEFT =5,
555 AVCHROMA_LOC_BOTTOM =6,
556 AVCHROMA_LOC_NB , ///< Not part of ABI
563 AV_LPC_TYPE_DEFAULT = -1, ///< use the codec default LPC type
564 AV_LPC_TYPE_NONE = 0, ///< do not use LPC prediction or use all zero coefficients
565 AV_LPC_TYPE_FIXED = 1, ///< fixed LPC coefficients
566 AV_LPC_TYPE_LEVINSON = 2, ///< Levinson-Durbin recursion
567 AV_LPC_TYPE_CHOLESKY = 3, ///< Cholesky factorization
568 AV_LPC_TYPE_NB , ///< Not part of ABI
571 typedef struct RcOverride{
574 int qscale; // If this is 0 then quality_factor will be used instead.
575 float quality_factor;
578 #define FF_MAX_B_FRAMES 16
581 These flags can be passed in AVCodecContext.flags before initialization.
582 Note: Not everything is supported yet.
585 #define CODEC_FLAG_QSCALE 0x0002 ///< Use fixed qscale.
586 #define CODEC_FLAG_4MV 0x0004 ///< 4 MV per MB allowed / advanced prediction for H.263.
587 #define CODEC_FLAG_QPEL 0x0010 ///< Use qpel MC.
588 #define CODEC_FLAG_GMC 0x0020 ///< Use GMC.
589 #define CODEC_FLAG_MV0 0x0040 ///< Always try a MB with MV=<0,0>.
590 #define CODEC_FLAG_PART 0x0080 ///< Use data partitioning.
592 * The parent program guarantees that the input for B-frames containing
593 * streams is not written to for at least s->max_b_frames+1 frames, if
594 * this is not set the input will be copied.
596 #define CODEC_FLAG_INPUT_PRESERVED 0x0100
597 #define CODEC_FLAG_PASS1 0x0200 ///< Use internal 2pass ratecontrol in first pass mode.
598 #define CODEC_FLAG_PASS2 0x0400 ///< Use internal 2pass ratecontrol in second pass mode.
599 #define CODEC_FLAG_EXTERN_HUFF 0x1000 ///< Use external Huffman table (for MJPEG).
600 #define CODEC_FLAG_GRAY 0x2000 ///< Only decode/encode grayscale.
601 #define CODEC_FLAG_EMU_EDGE 0x4000 ///< Don't draw edges.
602 #define CODEC_FLAG_PSNR 0x8000 ///< error[?] variables will be set during encoding.
603 #define CODEC_FLAG_TRUNCATED 0x00010000 /** Input bitstream might be truncated at a random
604 location instead of only at frame boundaries. */
605 #define CODEC_FLAG_NORMALIZE_AQP 0x00020000 ///< Normalize adaptive quantization.
606 #define CODEC_FLAG_INTERLACED_DCT 0x00040000 ///< Use interlaced DCT.
607 #define CODEC_FLAG_LOW_DELAY 0x00080000 ///< Force low delay.
608 #define CODEC_FLAG_ALT_SCAN 0x00100000 ///< Use alternate scan.
609 #define CODEC_FLAG_GLOBAL_HEADER 0x00400000 ///< Place global headers in extradata instead of every keyframe.
610 #define CODEC_FLAG_BITEXACT 0x00800000 ///< Use only bitexact stuff (except (I)DCT).
611 /* Fx : Flag for h263+ extra options */
612 #define CODEC_FLAG_AC_PRED 0x01000000 ///< H.263 advanced intra coding / MPEG-4 AC prediction
613 #define CODEC_FLAG_H263P_UMV 0x02000000 ///< unlimited motion vector
614 #define CODEC_FLAG_CBP_RD 0x04000000 ///< Use rate distortion optimization for cbp.
615 #define CODEC_FLAG_QP_RD 0x08000000 ///< Use rate distortion optimization for qp selectioon.
616 #define CODEC_FLAG_H263P_AIV 0x00000008 ///< H.263 alternative inter VLC
617 #define CODEC_FLAG_OBMC 0x00000001 ///< OBMC
618 #define CODEC_FLAG_LOOP_FILTER 0x00000800 ///< loop filter
619 #define CODEC_FLAG_H263P_SLICE_STRUCT 0x10000000
620 #define CODEC_FLAG_INTERLACED_ME 0x20000000 ///< interlaced motion estimation
621 #define CODEC_FLAG_SVCD_SCAN_OFFSET 0x40000000 ///< Will reserve space for SVCD scan offset user data.
622 #define CODEC_FLAG_CLOSED_GOP 0x80000000
623 #define CODEC_FLAG2_FAST 0x00000001 ///< Allow non spec compliant speedup tricks.
624 #define CODEC_FLAG2_STRICT_GOP 0x00000002 ///< Strictly enforce GOP size.
625 #define CODEC_FLAG2_NO_OUTPUT 0x00000004 ///< Skip bitstream encoding.
626 #define CODEC_FLAG2_LOCAL_HEADER 0x00000008 ///< Place global headers at every keyframe instead of in extradata.
627 #define CODEC_FLAG2_BPYRAMID 0x00000010 ///< H.264 allow B-frames to be used as references.
628 #define CODEC_FLAG2_WPRED 0x00000020 ///< H.264 weighted biprediction for B-frames
629 #define CODEC_FLAG2_MIXED_REFS 0x00000040 ///< H.264 one reference per partition, as opposed to one reference per macroblock
630 #define CODEC_FLAG2_8X8DCT 0x00000080 ///< H.264 high profile 8x8 transform
631 #define CODEC_FLAG2_FASTPSKIP 0x00000100 ///< H.264 fast pskip
632 #define CODEC_FLAG2_AUD 0x00000200 ///< H.264 access unit delimiters
633 #define CODEC_FLAG2_BRDO 0x00000400 ///< B-frame rate-distortion optimization
634 #define CODEC_FLAG2_INTRA_VLC 0x00000800 ///< Use MPEG-2 intra VLC table.
635 #define CODEC_FLAG2_MEMC_ONLY 0x00001000 ///< Only do ME/MC (I frames -> ref, P frame -> ME+MC).
636 #define CODEC_FLAG2_DROP_FRAME_TIMECODE 0x00002000 ///< timecode is in drop frame format.
637 #define CODEC_FLAG2_SKIP_RD 0x00004000 ///< RD optimal MB level residual skipping
638 #define CODEC_FLAG2_CHUNKS 0x00008000 ///< Input bitstream might be truncated at a packet boundaries instead of only at frame boundaries.
639 #define CODEC_FLAG2_NON_LINEAR_QUANT 0x00010000 ///< Use MPEG-2 nonlinear quantizer.
640 #define CODEC_FLAG2_BIT_RESERVOIR 0x00020000 ///< Use a bit reservoir when encoding if possible
641 #define CODEC_FLAG2_MBTREE 0x00040000 ///< Use macroblock tree ratecontrol (x264 only)
642 #define CODEC_FLAG2_PSY 0x00080000 ///< Use psycho visual optimizations.
643 #define CODEC_FLAG2_SSIM 0x00100000 ///< Compute SSIM during encoding, error[] values are undefined.
644 #define CODEC_FLAG2_INTRA_REFRESH 0x00200000 ///< Use periodic insertion of intra blocks instead of keyframes.
646 /* Unsupported options :
647 * Syntax Arithmetic coding (SAC)
648 * Reference Picture Selection
649 * Independent Segment Decoding */
651 /* codec capabilities */
653 #define CODEC_CAP_DRAW_HORIZ_BAND 0x0001 ///< Decoder can use draw_horiz_band callback.
655 * Codec uses get_buffer() for allocating buffers and supports custom allocators.
656 * If not set, it might not use get_buffer() at all or use operations that
657 * assume the buffer was allocated by avcodec_default_get_buffer.
659 #define CODEC_CAP_DR1 0x0002
660 /* If 'parse_only' field is true, then avcodec_parse_frame() can be used. */
661 #define CODEC_CAP_PARSE_ONLY 0x0004
662 #define CODEC_CAP_TRUNCATED 0x0008
663 /* Codec can export data for HW decoding (XvMC). */
664 #define CODEC_CAP_HWACCEL 0x0010
666 * Codec has a nonzero delay and needs to be fed with NULL at the end to get the delayed data.
667 * If this is not set, the codec is guaranteed to never be fed with NULL data.
669 #define CODEC_CAP_DELAY 0x0020
671 * Codec can be fed a final frame with a smaller size.
672 * This can be used to prevent truncation of the last audio samples.
674 #define CODEC_CAP_SMALL_LAST_FRAME 0x0040
676 * Codec can export data for HW decoding (VDPAU).
678 #define CODEC_CAP_HWACCEL_VDPAU 0x0080
680 * Codec can output multiple frames per AVPacket
681 * Normally demuxers return one frame at a time, demuxers which do not do
682 * are connected to a parser to split what they return into proper frames.
683 * This flag is reserved to the very rare category of codecs which have a
684 * bitstream that cannot be split into frames without timeconsuming
685 * operations like full decoding. Demuxers carring such bitstreams thus
686 * may return multiple frames in a packet. This has many disadvantages like
687 * prohibiting stream copy in many cases thus it should only be considered
690 #define CODEC_CAP_SUBFRAMES 0x0100
692 * Codec is experimental and is thus avoided in favor of non experimental
695 #define CODEC_CAP_EXPERIMENTAL 0x0200
697 //The following defines may change, don't expect compatibility if you use them.
698 #define MB_TYPE_INTRA4x4 0x0001
699 #define MB_TYPE_INTRA16x16 0x0002 //FIXME H.264-specific
700 #define MB_TYPE_INTRA_PCM 0x0004 //FIXME H.264-specific
701 #define MB_TYPE_16x16 0x0008
702 #define MB_TYPE_16x8 0x0010
703 #define MB_TYPE_8x16 0x0020
704 #define MB_TYPE_8x8 0x0040
705 #define MB_TYPE_INTERLACED 0x0080
706 #define MB_TYPE_DIRECT2 0x0100 //FIXME
707 #define MB_TYPE_ACPRED 0x0200
708 #define MB_TYPE_GMC 0x0400
709 #define MB_TYPE_SKIP 0x0800
710 #define MB_TYPE_P0L0 0x1000
711 #define MB_TYPE_P1L0 0x2000
712 #define MB_TYPE_P0L1 0x4000
713 #define MB_TYPE_P1L1 0x8000
714 #define MB_TYPE_L0 (MB_TYPE_P0L0 | MB_TYPE_P1L0)
715 #define MB_TYPE_L1 (MB_TYPE_P0L1 | MB_TYPE_P1L1)
716 #define MB_TYPE_L0L1 (MB_TYPE_L0 | MB_TYPE_L1)
717 #define MB_TYPE_QUANT 0x00010000
718 #define MB_TYPE_CBP 0x00020000
719 //Note bits 24-31 are reserved for codec specific use (h264 ref0, mpeg1 0mv, ...)
723 * This specifies the area which should be displayed.
724 * Note there may be multiple such areas for one frame.
726 typedef struct AVPanScan{
729 * - encoding: Set by user.
730 * - decoding: Set by libavcodec.
735 * width and height in 1/16 pel
736 * - encoding: Set by user.
737 * - decoding: Set by libavcodec.
743 * position of the top left corner in 1/16 pel for up to 3 fields/frames
744 * - encoding: Set by user.
745 * - decoding: Set by libavcodec.
747 int16_t position[3][2];
750 #define FF_COMMON_FRAME \
752 * pointer to the picture planes.\
753 * This might be different from the first allocated byte\
760 * pointer to the first allocated byte of the picture. Can be used in get_buffer/release_buffer.\
761 * This isn't used by libavcodec unless the default get/release_buffer() is used.\
767 * 1 -> keyframe, 0-> not\
768 * - encoding: Set by libavcodec.\
769 * - decoding: Set by libavcodec.\
774 * Picture type of the frame, see ?_TYPE below.\
775 * - encoding: Set by libavcodec. for coded_picture (and set by user for input).\
776 * - decoding: Set by libavcodec.\
781 * presentation timestamp in time_base units (time when frame should be shown to user)\
782 * If AV_NOPTS_VALUE then frame_rate = 1/time_base will be assumed.\
783 * - encoding: MUST be set by user.\
784 * - decoding: Set by libavcodec.\
789 * picture number in bitstream order\
790 * - encoding: set by\
791 * - decoding: Set by libavcodec.\
793 int coded_picture_number;\
795 * picture number in display order\
796 * - encoding: set by\
797 * - decoding: Set by libavcodec.\
799 int display_picture_number;\
802 * quality (between 1 (good) and FF_LAMBDA_MAX (bad)) \
803 * - encoding: Set by libavcodec. for coded_picture (and set by user for input).\
804 * - decoding: Set by libavcodec.\
809 * buffer age (1->was last buffer and dint change, 2->..., ...).\
810 * Set to INT_MAX if the buffer has not been used yet.\
811 * - encoding: unused\
812 * - decoding: MUST be set by get_buffer().\
817 * is this picture used as reference\
818 * The values for this are the same as the MpegEncContext.picture_structure\
819 * variable, that is 1->top field, 2->bottom field, 3->frame/both fields.\
820 * Set to 4 for delayed, non-reference frames.\
821 * - encoding: unused\
822 * - decoding: Set by libavcodec. (before get_buffer() call)).\
828 * - encoding: unused\
829 * - decoding: Set by libavcodec.\
831 int8_t *qscale_table;\
834 * - encoding: unused\
835 * - decoding: Set by libavcodec.\
840 * mbskip_table[mb]>=1 if MB didn't change\
841 * stride= mb_width = (width+15)>>4\
842 * - encoding: unused\
843 * - decoding: Set by libavcodec.\
845 uint8_t *mbskip_table;\
848 * motion vector table\
851 * int mv_sample_log2= 4 - motion_subsample_log2;\
852 * int mb_width= (width+15)>>4;\
853 * int mv_stride= (mb_width << mv_sample_log2) + 1;\
854 * motion_val[direction][x + y*mv_stride][0->mv_x, 1->mv_y];\
856 * - encoding: Set by user.\
857 * - decoding: Set by libavcodec.\
859 int16_t (*motion_val[2])[2];\
862 * macroblock type table\
863 * mb_type_base + mb_width + 2\
864 * - encoding: Set by user.\
865 * - decoding: Set by libavcodec.\
870 * log2 of the size of the block which a single vector in motion_val represents: \
871 * (4->16x16, 3->8x8, 2-> 4x4, 1-> 2x2)\
872 * - encoding: unused\
873 * - decoding: Set by libavcodec.\
875 uint8_t motion_subsample_log2;\
878 * for some private data of the user\
879 * - encoding: unused\
880 * - decoding: Set by user.\
886 * - encoding: Set by libavcodec. if flags&CODEC_FLAG_PSNR.\
887 * - decoding: unused\
892 * type of the buffer (to keep track of who has to deallocate data[*])\
893 * - encoding: Set by the one who allocates it.\
894 * - decoding: Set by the one who allocates it.\
895 * Note: User allocated (direct rendering) & internal buffers cannot coexist currently.\
900 * When decoding, this signals how much the picture must be delayed.\
901 * extra_delay = repeat_pict / (2*fps)\
902 * - encoding: unused\
903 * - decoding: Set by libavcodec.\
913 * The content of the picture is interlaced.\
914 * - encoding: Set by user.\
915 * - decoding: Set by libavcodec. (default 0)\
917 int interlaced_frame;\
920 * If the content is interlaced, is top field displayed first.\
921 * - encoding: Set by user.\
922 * - decoding: Set by libavcodec.\
924 int top_field_first;\
928 * - encoding: Set by user.\
929 * - decoding: Set by libavcodec.\
931 AVPanScan *pan_scan;\
934 * Tell user application that palette has changed from previous frame.\
935 * - encoding: ??? (no palette-enabled encoder yet)\
936 * - decoding: Set by libavcodec. (default 0).\
938 int palette_has_changed;\
941 * codec suggestion on buffer type if != 0\
942 * - encoding: unused\
943 * - decoding: Set by libavcodec. (before get_buffer() call)).\
949 * - encoding: unused\
950 * - decoding: Set by libavcodec.\
955 * motion reference frame index\
956 * the order in which these are stored can depend on the codec.\
957 * - encoding: Set by user.\
958 * - decoding: Set by libavcodec.\
960 int8_t *ref_index[2];\
963 * reordered opaque 64bit number (generally a PTS) from AVCodecContext.reordered_opaque\
964 * output in AVFrame.reordered_opaque\
965 * - encoding: unused\
966 * - decoding: Read by user.\
968 int64_t reordered_opaque;\
971 * hardware accelerator private data (FFmpeg allocated)\
972 * - encoding: unused\
973 * - decoding: Set by libavcodec\
975 void *hwaccel_picture_private;\
978 #define FF_QSCALE_TYPE_MPEG1 0
979 #define FF_QSCALE_TYPE_MPEG2 1
980 #define FF_QSCALE_TYPE_H264 2
981 #define FF_QSCALE_TYPE_VP56 3
983 #define FF_BUFFER_TYPE_INTERNAL 1
984 #define FF_BUFFER_TYPE_USER 2 ///< direct rendering buffers (image is (de)allocated by user)
985 #define FF_BUFFER_TYPE_SHARED 4 ///< Buffer from somewhere else; don't deallocate image (data/base), all other tables are not shared.
986 #define FF_BUFFER_TYPE_COPY 8 ///< Just a (modified) copy of some other buffer, don't deallocate anything.
989 #define FF_I_TYPE 1 ///< Intra
990 #define FF_P_TYPE 2 ///< Predicted
991 #define FF_B_TYPE 3 ///< Bi-dir predicted
992 #define FF_S_TYPE 4 ///< S(GMC)-VOP MPEG4
993 #define FF_SI_TYPE 5 ///< Switching Intra
994 #define FF_SP_TYPE 6 ///< Switching Predicted
997 #define FF_BUFFER_HINTS_VALID 0x01 // Buffer hints value is meaningful (if 0 ignore).
998 #define FF_BUFFER_HINTS_READABLE 0x02 // Codec will read from buffer.
999 #define FF_BUFFER_HINTS_PRESERVE 0x04 // User must not alter buffer content.
1000 #define FF_BUFFER_HINTS_REUSABLE 0x08 // Codec will reuse the buffer (update).
1002 typedef struct AVPacket {
1004 * Presentation timestamp in AVStream->time_base units; the time at which
1005 * the decompressed packet will be presented to the user.
1006 * Can be AV_NOPTS_VALUE if it is not stored in the file.
1007 * pts MUST be larger or equal to dts as presentation cannot happen before
1008 * decompression, unless one wants to view hex dumps. Some formats misuse
1009 * the terms dts and pts/cts to mean something different. Such timestamps
1010 * must be converted to true pts/dts before they are stored in AVPacket.
1014 * Decompression timestamp in AVStream->time_base units; the time at which
1015 * the packet is decompressed.
1016 * Can be AV_NOPTS_VALUE if it is not stored in the file.
1024 * Duration of this packet in AVStream->time_base units, 0 if unknown.
1025 * Equals next_pts - this_pts in presentation order.
1028 void (*destruct)(struct AVPacket *);
1030 int64_t pos; ///< byte position in stream, -1 if unknown
1033 * Time difference in AVStream->time_base units from the pts of this
1034 * packet to the point at which the output from the decoder has converged
1035 * independent from the availability of previous frames. That is, the
1036 * frames are virtually identical no matter if decoding started from
1037 * the very first frame or from this keyframe.
1038 * Is AV_NOPTS_VALUE if unknown.
1039 * This field is not the display duration of the current packet.
1040 * This field has no meaning if the packet does not have AV_PKT_FLAG_KEY
1043 * The purpose of this field is to allow seeking in streams that have no
1044 * keyframes in the conventional sense. It corresponds to the
1045 * recovery point SEI in H.264 and match_time_delta in NUT. It is also
1046 * essential for some types of subtitle streams to ensure that all
1047 * subtitles are correctly displayed after seeking.
1049 int64_t convergence_duration;
1051 #define AV_PKT_FLAG_KEY 0x0001
1052 #if LIBAVCODEC_VERSION_MAJOR < 53
1053 #define PKT_FLAG_KEY AV_PKT_FLAG_KEY
1057 * Audio Video Frame.
1058 * New fields can be added to the end of FF_COMMON_FRAME with minor version
1060 * Removal, reordering and changes to existing fields require a major
1061 * version bump. No fields should be added into AVFrame before or after
1063 * sizeof(AVFrame) must not be used outside libav*.
1065 typedef struct AVFrame {
1070 * main external API structure.
1071 * New fields can be added to the end with minor version bumps.
1072 * Removal, reordering and changes to existing fields require a major
1074 * sizeof(AVCodecContext) must not be used outside libav*.
1076 typedef struct AVCodecContext {
1078 * information on struct for av_log
1079 * - set by avcodec_alloc_context
1081 const AVClass *av_class;
1083 * the average bitrate
1084 * - encoding: Set by user; unused for constant quantizer encoding.
1085 * - decoding: Set by libavcodec. 0 or some bitrate if this info is available in the stream.
1090 * number of bits the bitstream is allowed to diverge from the reference.
1091 * the reference can be CBR (for CBR pass1) or VBR (for pass2)
1092 * - encoding: Set by user; unused for constant quantizer encoding.
1093 * - decoding: unused
1095 int bit_rate_tolerance;
1099 * - encoding: Set by user.
1100 * - decoding: Set by user.
1105 * Some codecs need additional format info. It is stored here.
1106 * If any muxer uses this then ALL demuxers/parsers AND encoders for the
1107 * specific codec MUST set it correctly otherwise stream copy breaks.
1108 * In general use of this field by muxers is not recommanded.
1109 * - encoding: Set by libavcodec.
1110 * - decoding: Set by libavcodec. (FIXME: Is this OK?)
1115 * Motion estimation algorithm used for video coding.
1116 * 1 (zero), 2 (full), 3 (log), 4 (phods), 5 (epzs), 6 (x1), 7 (hex),
1117 * 8 (umh), 9 (iter), 10 (tesa) [7, 8, 10 are x264 specific, 9 is snow specific]
1118 * - encoding: MUST be set by user.
1119 * - decoding: unused
1124 * some codecs need / can use extradata like Huffman tables.
1125 * mjpeg: Huffman tables
1126 * rv10: additional flags
1127 * mpeg4: global headers (they can be in the bitstream or here)
1128 * The allocated memory should be FF_INPUT_BUFFER_PADDING_SIZE bytes larger
1129 * than extradata_size to avoid prolems if it is read with the bitstream reader.
1130 * The bytewise contents of extradata must not depend on the architecture or CPU endianness.
1131 * - encoding: Set/allocated/freed by libavcodec.
1132 * - decoding: Set/allocated/freed by user.
1138 * This is the fundamental unit of time (in seconds) in terms
1139 * of which frame timestamps are represented. For fixed-fps content,
1140 * timebase should be 1/framerate and timestamp increments should be
1142 * - encoding: MUST be set by user.
1143 * - decoding: Set by libavcodec.
1145 AVRational time_base;
1149 * picture width / height.
1150 * - encoding: MUST be set by user.
1151 * - decoding: Set by libavcodec.
1152 * Note: For compatibility it is possible to set this instead of
1153 * coded_width/height before decoding.
1157 #define FF_ASPECT_EXTENDED 15
1160 * the number of pictures in a group of pictures, or 0 for intra_only
1161 * - encoding: Set by user.
1162 * - decoding: unused
1167 * Pixel format, see PIX_FMT_xxx.
1168 * May be set by the demuxer if known from headers.
1169 * May be overriden by the decoder if it knows better.
1170 * - encoding: Set by user.
1171 * - decoding: Set by user if known, overridden by libavcodec if known
1173 enum PixelFormat pix_fmt;
1176 * Frame rate emulation. If not zero, the lower layer (i.e. format handler)
1177 * has to read frames at native frame rate.
1178 * - encoding: Set by user.
1179 * - decoding: unused
1184 * If non NULL, 'draw_horiz_band' is called by the libavcodec
1185 * decoder to draw a horizontal band. It improves cache usage. Not
1186 * all codecs can do that. You must check the codec capabilities
1188 * The function is also used by hardware acceleration APIs.
1189 * It is called at least once during frame decoding to pass
1190 * the data needed for hardware render.
1191 * In that mode instead of pixel data, AVFrame points to
1192 * a structure specific to the acceleration API. The application
1193 * reads the structure and can change some fields to indicate progress
1195 * - encoding: unused
1196 * - decoding: Set by user.
1197 * @param height the height of the slice
1198 * @param y the y position of the slice
1199 * @param type 1->top field, 2->bottom field, 3->frame
1200 * @param offset offset into the AVFrame.data from which the slice should be read
1202 void (*draw_horiz_band)(struct AVCodecContext *s,
1203 const AVFrame *src, int offset[4],
1204 int y, int type, int height);
1207 int sample_rate; ///< samples per second
1208 int channels; ///< number of audio channels
1211 * audio sample format
1212 * - encoding: Set by user.
1213 * - decoding: Set by libavcodec.
1215 enum SampleFormat sample_fmt; ///< sample format
1217 /* The following data should not be initialized. */
1219 * Samples per packet, initialized when calling 'init'.
1222 int frame_number; ///< audio or video frame number
1223 #if LIBAVCODEC_VERSION_MAJOR < 53
1224 int real_pict_num; ///< Returns the real picture number of previous encoded frame.
1228 * Number of frames the decoded output will be delayed relative to
1229 * the encoded input.
1230 * - encoding: Set by libavcodec.
1231 * - decoding: unused
1235 /* - encoding parameters */
1236 float qcompress; ///< amount of qscale change between easy & hard scenes (0.0-1.0)
1237 float qblur; ///< amount of qscale smoothing over time (0.0-1.0)
1241 * - encoding: Set by user.
1242 * - decoding: unused
1248 * - encoding: Set by user.
1249 * - decoding: unused
1254 * maximum quantizer difference between frames
1255 * - encoding: Set by user.
1256 * - decoding: unused
1261 * maximum number of B-frames between non-B-frames
1262 * Note: The output will be delayed by max_b_frames+1 relative to the input.
1263 * - encoding: Set by user.
1264 * - decoding: unused
1269 * qscale factor between IP and B-frames
1270 * If > 0 then the last P-frame quantizer will be used (q= lastp_q*factor+offset).
1271 * If < 0 then normal ratecontrol will be done (q= -normal_q*factor+offset).
1272 * - encoding: Set by user.
1273 * - decoding: unused
1275 float b_quant_factor;
1277 /** obsolete FIXME remove */
1279 #define FF_RC_STRATEGY_XVID 1
1281 int b_frame_strategy;
1285 * - encoding: unused
1286 * - decoding: Set by user. 1-> Skip B-frames, 2-> Skip IDCT/dequant too, 5-> Skip everything except header
1287 * @deprecated Deprecated in favor of skip_idct and skip_frame.
1291 struct AVCodec *codec;
1295 int rtp_payload_size; /* The size of the RTP payload: the coder will */
1296 /* do its best to deliver a chunk with size */
1297 /* below rtp_payload_size, the chunk will start */
1298 /* with a start code on some codecs like H.263. */
1299 /* This doesn't take account of any particular */
1300 /* headers inside the transmitted RTP payload. */
1303 /* The RTP callback: This function is called */
1304 /* every time the encoder has a packet to send. */
1305 /* It depends on the encoder if the data starts */
1306 /* with a Start Code (it should). H.263 does. */
1307 /* mb_nb contains the number of macroblocks */
1308 /* encoded in the RTP payload. */
1309 void (*rtp_callback)(struct AVCodecContext *avctx, void *data, int size, int mb_nb);
1311 /* statistics, used for 2-pass encoding */
1322 * number of bits used for the previously encoded frame
1323 * - encoding: Set by libavcodec.
1324 * - decoding: unused
1329 * Private data of the user, can be used to carry app specific stuff.
1330 * - encoding: Set by user.
1331 * - decoding: Set by user.
1335 char codec_name[32];
1336 enum AVMediaType codec_type; /* see AVMEDIA_TYPE_xxx */
1337 enum CodecID codec_id; /* see CODEC_ID_xxx */
1340 * fourcc (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A').
1341 * This is used to work around some encoder bugs.
1342 * A demuxer should set this to what is stored in the field used to identify the codec.
1343 * If there are multiple such fields in a container then the demuxer should choose the one
1344 * which maximizes the information about the used codec.
1345 * If the codec tag field in a container is larger then 32 bits then the demuxer should
1346 * remap the longer ID to 32 bits with a table or other structure. Alternatively a new
1347 * extra_codec_tag + size could be added but for this a clear advantage must be demonstrated
1349 * - encoding: Set by user, if not then the default based on codec_id will be used.
1350 * - decoding: Set by user, will be converted to uppercase by libavcodec during init.
1352 unsigned int codec_tag;
1355 * Work around bugs in encoders which sometimes cannot be detected automatically.
1356 * - encoding: Set by user
1357 * - decoding: Set by user
1359 int workaround_bugs;
1360 #define FF_BUG_AUTODETECT 1 ///< autodetection
1361 #define FF_BUG_OLD_MSMPEG4 2
1362 #define FF_BUG_XVID_ILACE 4
1363 #define FF_BUG_UMP4 8
1364 #define FF_BUG_NO_PADDING 16
1365 #define FF_BUG_AMV 32
1366 #define FF_BUG_AC_VLC 0 ///< Will be removed, libavcodec can now handle these non-compliant files by default.
1367 #define FF_BUG_QPEL_CHROMA 64
1368 #define FF_BUG_STD_QPEL 128
1369 #define FF_BUG_QPEL_CHROMA2 256
1370 #define FF_BUG_DIRECT_BLOCKSIZE 512
1371 #define FF_BUG_EDGE 1024
1372 #define FF_BUG_HPEL_CHROMA 2048
1373 #define FF_BUG_DC_CLIP 4096
1374 #define FF_BUG_MS 8192 ///< Work around various bugs in Microsoft's broken decoders.
1375 #define FF_BUG_TRUNCATED 16384
1376 //#define FF_BUG_FAKE_SCALABILITY 16 //Autodetection should work 100%.
1379 * luma single coefficient elimination threshold
1380 * - encoding: Set by user.
1381 * - decoding: unused
1383 int luma_elim_threshold;
1386 * chroma single coeff elimination threshold
1387 * - encoding: Set by user.
1388 * - decoding: unused
1390 int chroma_elim_threshold;
1393 * strictly follow the standard (MPEG4, ...).
1394 * - encoding: Set by user.
1395 * - decoding: Set by user.
1396 * Setting this to STRICT or higher means the encoder and decoder will
1397 * generally do stupid things, whereas setting it to unofficial or lower
1398 * will mean the encoder might produce output that is not supported by all
1399 * spec-compliant decoders. Decoders don't differentiate between normal,
1400 * unofficial and experimental (that is, they always try to decode things
1401 * when they can) unless they are explicitly asked to behave stupidly
1402 * (=strictly conform to the specs)
1404 int strict_std_compliance;
1405 #define FF_COMPLIANCE_VERY_STRICT 2 ///< Strictly conform to an older more strict version of the spec or reference software.
1406 #define FF_COMPLIANCE_STRICT 1 ///< Strictly conform to all the things in the spec no matter what consequences.
1407 #define FF_COMPLIANCE_NORMAL 0
1408 #if LIBAVCODEC_VERSION_MAJOR < 53
1409 #define FF_COMPLIANCE_INOFFICIAL -1 ///< Allow inofficial extensions (deprecated - use FF_COMPLIANCE_UNOFFICIAL instead).
1411 #define FF_COMPLIANCE_UNOFFICIAL -1 ///< Allow unofficial extensions
1412 #define FF_COMPLIANCE_EXPERIMENTAL -2 ///< Allow nonstandardized experimental things.
1415 * qscale offset between IP and B-frames
1416 * - encoding: Set by user.
1417 * - decoding: unused
1419 float b_quant_offset;
1422 * Error recognization; higher values will detect more errors but may
1423 * misdetect some more or less valid parts as errors.
1424 * - encoding: unused
1425 * - decoding: Set by user.
1427 int error_recognition;
1428 #define FF_ER_CAREFUL 1
1429 #define FF_ER_COMPLIANT 2
1430 #define FF_ER_AGGRESSIVE 3
1431 #define FF_ER_VERY_AGGRESSIVE 4
1434 * Called at the beginning of each frame to get a buffer for it.
1435 * If pic.reference is set then the frame will be read later by libavcodec.
1436 * avcodec_align_dimensions2() should be used to find the required width and
1437 * height, as they normally need to be rounded up to the next multiple of 16.
1438 * if CODEC_CAP_DR1 is not set then get_buffer() must call
1439 * avcodec_default_get_buffer() instead of providing buffers allocated by
1441 * - encoding: unused
1442 * - decoding: Set by libavcodec, user can override.
1444 int (*get_buffer)(struct AVCodecContext *c, AVFrame *pic);
1447 * Called to release buffers which were allocated with get_buffer.
1448 * A released buffer can be reused in get_buffer().
1449 * pic.data[*] must be set to NULL.
1450 * - encoding: unused
1451 * - decoding: Set by libavcodec, user can override.
1453 void (*release_buffer)(struct AVCodecContext *c, AVFrame *pic);
1456 * Size of the frame reordering buffer in the decoder.
1457 * For MPEG-2 it is 1 IPB or 0 low delay IP.
1458 * - encoding: Set by libavcodec.
1459 * - decoding: Set by libavcodec.
1464 * number of bytes per packet if constant and known or 0
1465 * Used by some WAV based audio codecs.
1469 int parse_only; /* - decoding only: If true, only parsing is done
1470 (function avcodec_parse_frame()). The frame
1471 data is returned. Only MPEG codecs support this now. */
1474 * 0-> h263 quant 1-> mpeg quant
1475 * - encoding: Set by user.
1476 * - decoding: unused
1481 * pass1 encoding statistics output buffer
1482 * - encoding: Set by libavcodec.
1483 * - decoding: unused
1488 * pass2 encoding statistics input buffer
1489 * Concatenated stuff from stats_out of pass1 should be placed here.
1490 * - encoding: Allocated/set/freed by user.
1491 * - decoding: unused
1496 * ratecontrol qmin qmax limiting method
1497 * 0-> clipping, 1-> use a nice continous function to limit qscale wthin qmin/qmax.
1498 * - encoding: Set by user.
1499 * - decoding: unused
1507 * ratecontrol override, see RcOverride
1508 * - encoding: Allocated/set/freed by user.
1509 * - decoding: unused
1511 RcOverride *rc_override;
1512 int rc_override_count;
1515 * rate control equation
1516 * - encoding: Set by user
1517 * - decoding: unused
1523 * - encoding: Set by user.
1524 * - decoding: unused
1530 * - encoding: Set by user.
1531 * - decoding: unused
1536 * decoder bitstream buffer size
1537 * - encoding: Set by user.
1538 * - decoding: unused
1541 float rc_buffer_aggressivity;
1544 * qscale factor between P and I-frames
1545 * If > 0 then the last p frame quantizer will be used (q= lastp_q*factor+offset).
1546 * If < 0 then normal ratecontrol will be done (q= -normal_q*factor+offset).
1547 * - encoding: Set by user.
1548 * - decoding: unused
1550 float i_quant_factor;
1553 * qscale offset between P and I-frames
1554 * - encoding: Set by user.
1555 * - decoding: unused
1557 float i_quant_offset;
1560 * initial complexity for pass1 ratecontrol
1561 * - encoding: Set by user.
1562 * - decoding: unused
1564 float rc_initial_cplx;
1567 * DCT algorithm, see FF_DCT_* below
1568 * - encoding: Set by user.
1569 * - decoding: unused
1572 #define FF_DCT_AUTO 0
1573 #define FF_DCT_FASTINT 1
1574 #define FF_DCT_INT 2
1575 #define FF_DCT_MMX 3
1576 #define FF_DCT_MLIB 4
1577 #define FF_DCT_ALTIVEC 5
1578 #define FF_DCT_FAAN 6
1581 * luminance masking (0-> disabled)
1582 * - encoding: Set by user.
1583 * - decoding: unused
1588 * temporary complexity masking (0-> disabled)
1589 * - encoding: Set by user.
1590 * - decoding: unused
1592 float temporal_cplx_masking;
1595 * spatial complexity masking (0-> disabled)
1596 * - encoding: Set by user.
1597 * - decoding: unused
1599 float spatial_cplx_masking;
1602 * p block masking (0-> disabled)
1603 * - encoding: Set by user.
1604 * - decoding: unused
1609 * darkness masking (0-> disabled)
1610 * - encoding: Set by user.
1611 * - decoding: unused
1616 * IDCT algorithm, see FF_IDCT_* below.
1617 * - encoding: Set by user.
1618 * - decoding: Set by user.
1621 #define FF_IDCT_AUTO 0
1622 #define FF_IDCT_INT 1
1623 #define FF_IDCT_SIMPLE 2
1624 #define FF_IDCT_SIMPLEMMX 3
1625 #define FF_IDCT_LIBMPEG2MMX 4
1626 #define FF_IDCT_PS2 5
1627 #define FF_IDCT_MLIB 6
1628 #define FF_IDCT_ARM 7
1629 #define FF_IDCT_ALTIVEC 8
1630 #define FF_IDCT_SH4 9
1631 #define FF_IDCT_SIMPLEARM 10
1632 #define FF_IDCT_H264 11
1633 #define FF_IDCT_VP3 12
1634 #define FF_IDCT_IPP 13
1635 #define FF_IDCT_XVIDMMX 14
1636 #define FF_IDCT_CAVS 15
1637 #define FF_IDCT_SIMPLEARMV5TE 16
1638 #define FF_IDCT_SIMPLEARMV6 17
1639 #define FF_IDCT_SIMPLEVIS 18
1640 #define FF_IDCT_WMV2 19
1641 #define FF_IDCT_FAAN 20
1642 #define FF_IDCT_EA 21
1643 #define FF_IDCT_SIMPLENEON 22
1644 #define FF_IDCT_SIMPLEALPHA 23
1645 #define FF_IDCT_BINK 24
1649 * - encoding: Set by libavcodec.
1650 * - decoding: Set by user (or 0).
1654 * slice offsets in the frame in bytes
1655 * - encoding: Set/allocated by libavcodec.
1656 * - decoding: Set/allocated by user (or NULL).
1661 * error concealment flags
1662 * - encoding: unused
1663 * - decoding: Set by user.
1665 int error_concealment;
1666 #define FF_EC_GUESS_MVS 1
1667 #define FF_EC_DEBLOCK 2
1670 * dsp_mask could be add used to disable unwanted CPU features
1671 * CPU features (i.e. MMX, SSE. ...)
1673 * With the FORCE flag you may instead enable given CPU features.
1674 * (Dangerous: Usable in case of misdetection, improper usage however will
1675 * result into program crash.)
1680 #define FF_MM_FORCE AV_CPU_FLAG_FORCE
1681 #define FF_MM_MMX AV_CPU_FLAG_MMX
1682 #define FF_MM_3DNOW AV_CPU_FLAG_3DNOW
1683 #define FF_MM_MMXEXT AV_CPU_FLAG_MMX2
1684 #define FF_MM_MMX2 AV_CPU_FLAG_MMX2
1685 #define FF_MM_SSE AV_CPU_FLAG_SSE
1686 #define FF_MM_SSE2 AV_CPU_FLAG_SSE2
1687 #define FF_MM_SSE2SLOW AV_CPU_FLAG_SSE2SLOW
1688 #define FF_MM_3DNOWEXT AV_CPU_FLAG_3DNOWEXT
1689 #define FF_MM_SSE3 AV_CPU_FLAG_SSE3
1690 #define FF_MM_SSE3SLOW AV_CPU_FLAG_SSE3SLOW
1691 #define FF_MM_SSSE3 AV_CPU_FLAG_SSSE3
1692 #define FF_MM_SSE4 AV_CPU_FLAG_SSE4
1693 #define FF_MM_SSE42 AV_CPU_FLAG_SSE42
1694 #define FF_MM_IWMMXT AV_CPU_FLAG_IWMMXT
1695 #define FF_MM_ALTIVEC AV_CPU_FLAG_ALTIVEC
1699 * bits per sample/pixel from the demuxer (needed for huffyuv).
1700 * - encoding: Set by libavcodec.
1701 * - decoding: Set by user.
1703 int bits_per_coded_sample;
1706 * prediction method (needed for huffyuv)
1707 * - encoding: Set by user.
1708 * - decoding: unused
1710 int prediction_method;
1711 #define FF_PRED_LEFT 0
1712 #define FF_PRED_PLANE 1
1713 #define FF_PRED_MEDIAN 2
1716 * sample aspect ratio (0 if unknown)
1717 * That is the width of a pixel divided by the height of the pixel.
1718 * Numerator and denominator must be relatively prime and smaller than 256 for some video standards.
1719 * - encoding: Set by user.
1720 * - decoding: Set by libavcodec.
1722 AVRational sample_aspect_ratio;
1725 * the picture in the bitstream
1726 * - encoding: Set by libavcodec.
1727 * - decoding: Set by libavcodec.
1729 AVFrame *coded_frame;
1733 * - encoding: Set by user.
1734 * - decoding: Set by user.
1737 #define FF_DEBUG_PICT_INFO 1
1738 #define FF_DEBUG_RC 2
1739 #define FF_DEBUG_BITSTREAM 4
1740 #define FF_DEBUG_MB_TYPE 8
1741 #define FF_DEBUG_QP 16
1742 #define FF_DEBUG_MV 32
1743 #define FF_DEBUG_DCT_COEFF 0x00000040
1744 #define FF_DEBUG_SKIP 0x00000080
1745 #define FF_DEBUG_STARTCODE 0x00000100
1746 #define FF_DEBUG_PTS 0x00000200
1747 #define FF_DEBUG_ER 0x00000400
1748 #define FF_DEBUG_MMCO 0x00000800
1749 #define FF_DEBUG_BUGS 0x00001000
1750 #define FF_DEBUG_VIS_QP 0x00002000
1751 #define FF_DEBUG_VIS_MB_TYPE 0x00004000
1752 #define FF_DEBUG_BUFFERS 0x00008000
1756 * - encoding: Set by user.
1757 * - decoding: Set by user.
1760 #define FF_DEBUG_VIS_MV_P_FOR 0x00000001 //visualize forward predicted MVs of P frames
1761 #define FF_DEBUG_VIS_MV_B_FOR 0x00000002 //visualize forward predicted MVs of B frames
1762 #define FF_DEBUG_VIS_MV_B_BACK 0x00000004 //visualize backward predicted MVs of B frames
1766 * - encoding: Set by libavcodec if flags&CODEC_FLAG_PSNR.
1767 * - decoding: unused
1772 * minimum MB quantizer
1773 * - encoding: unused
1774 * - decoding: unused
1779 * maximum MB quantizer
1780 * - encoding: unused
1781 * - decoding: unused
1786 * motion estimation comparison function
1787 * - encoding: Set by user.
1788 * - decoding: unused
1792 * subpixel motion estimation comparison function
1793 * - encoding: Set by user.
1794 * - decoding: unused
1798 * macroblock comparison function (not supported yet)
1799 * - encoding: Set by user.
1800 * - decoding: unused
1804 * interlaced DCT comparison function
1805 * - encoding: Set by user.
1806 * - decoding: unused
1809 #define FF_CMP_SAD 0
1810 #define FF_CMP_SSE 1
1811 #define FF_CMP_SATD 2
1812 #define FF_CMP_DCT 3
1813 #define FF_CMP_PSNR 4
1814 #define FF_CMP_BIT 5
1816 #define FF_CMP_ZERO 7
1817 #define FF_CMP_VSAD 8
1818 #define FF_CMP_VSSE 9
1819 #define FF_CMP_NSSE 10
1820 #define FF_CMP_W53 11
1821 #define FF_CMP_W97 12
1822 #define FF_CMP_DCTMAX 13
1823 #define FF_CMP_DCT264 14
1824 #define FF_CMP_CHROMA 256
1827 * ME diamond size & shape
1828 * - encoding: Set by user.
1829 * - decoding: unused
1834 * amount of previous MV predictors (2a+1 x 2a+1 square)
1835 * - encoding: Set by user.
1836 * - decoding: unused
1838 int last_predictor_count;
1841 * prepass for motion estimation
1842 * - encoding: Set by user.
1843 * - decoding: unused
1848 * motion estimation prepass comparison function
1849 * - encoding: Set by user.
1850 * - decoding: unused
1855 * ME prepass diamond size & shape
1856 * - encoding: Set by user.
1857 * - decoding: unused
1863 * - encoding: Set by user.
1864 * - decoding: unused
1866 int me_subpel_quality;
1869 * callback to negotiate the pixelFormat
1870 * @param fmt is the list of formats which are supported by the codec,
1871 * it is terminated by -1 as 0 is a valid format, the formats are ordered by quality.
1872 * The first is always the native one.
1873 * @return the chosen format
1874 * - encoding: unused
1875 * - decoding: Set by user, if not set the native format will be chosen.
1877 enum PixelFormat (*get_format)(struct AVCodecContext *s, const enum PixelFormat * fmt);
1880 * DTG active format information (additional aspect ratio
1881 * information only used in DVB MPEG-2 transport streams)
1884 * - encoding: unused
1885 * - decoding: Set by decoder.
1887 int dtg_active_format;
1888 #define FF_DTG_AFD_SAME 8
1889 #define FF_DTG_AFD_4_3 9
1890 #define FF_DTG_AFD_16_9 10
1891 #define FF_DTG_AFD_14_9 11
1892 #define FF_DTG_AFD_4_3_SP_14_9 13
1893 #define FF_DTG_AFD_16_9_SP_14_9 14
1894 #define FF_DTG_AFD_SP_4_3 15
1897 * maximum motion estimation search range in subpel units
1898 * If 0 then no limit.
1900 * - encoding: Set by user.
1901 * - decoding: unused
1906 * intra quantizer bias
1907 * - encoding: Set by user.
1908 * - decoding: unused
1910 int intra_quant_bias;
1911 #define FF_DEFAULT_QUANT_BIAS 999999
1914 * inter quantizer bias
1915 * - encoding: Set by user.
1916 * - decoding: unused
1918 int inter_quant_bias;
1922 * - encoding: unused
1923 * - decoding: Which clrtable should be used for 8bit RGB images.
1924 * Tables have to be stored somewhere. FIXME
1929 * internal_buffer count
1930 * Don't touch, used by libavcodec default_get_buffer().
1932 int internal_buffer_count;
1936 * Don't touch, used by libavcodec default_get_buffer().
1938 void *internal_buffer;
1941 * Global quality for codecs which cannot change it per frame.
1942 * This should be proportional to MPEG-1/2/4 qscale.
1943 * - encoding: Set by user.
1944 * - decoding: unused
1948 #define FF_CODER_TYPE_VLC 0
1949 #define FF_CODER_TYPE_AC 1
1950 #define FF_CODER_TYPE_RAW 2
1951 #define FF_CODER_TYPE_RLE 3
1952 #define FF_CODER_TYPE_DEFLATE 4
1955 * - encoding: Set by user.
1956 * - decoding: unused
1962 * - encoding: Set by user.
1963 * - decoding: unused
1969 * - encoding: unused
1970 * - decoding: Set by user.
1972 uint8_t * (*realloc)(struct AVCodecContext *s, uint8_t *buf, int buf_size);
1977 * - encoding: unused
1978 * - decoding: Set by user.
1981 #define SLICE_FLAG_CODED_ORDER 0x0001 ///< draw_horiz_band() is called in coded order instead of display
1982 #define SLICE_FLAG_ALLOW_FIELD 0x0002 ///< allow draw_horiz_band() with field slices (MPEG2 field pics)
1983 #define SLICE_FLAG_ALLOW_PLANE 0x0004 ///< allow draw_horiz_band() with 1 component at a time (SVQ1)
1986 * XVideo Motion Acceleration
1987 * - encoding: forbidden
1988 * - decoding: set by decoder
1990 int xvmc_acceleration;
1993 * macroblock decision mode
1994 * - encoding: Set by user.
1995 * - decoding: unused
1998 #define FF_MB_DECISION_SIMPLE 0 ///< uses mb_cmp
1999 #define FF_MB_DECISION_BITS 1 ///< chooses the one which needs the fewest bits
2000 #define FF_MB_DECISION_RD 2 ///< rate distortion
2003 * custom intra quantization matrix
2004 * - encoding: Set by user, can be NULL.
2005 * - decoding: Set by libavcodec.
2007 uint16_t *intra_matrix;
2010 * custom inter quantization matrix
2011 * - encoding: Set by user, can be NULL.
2012 * - decoding: Set by libavcodec.
2014 uint16_t *inter_matrix;
2017 * fourcc from the AVI stream header (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A').
2018 * This is used to work around some encoder bugs.
2019 * - encoding: unused
2020 * - decoding: Set by user, will be converted to uppercase by libavcodec during init.
2022 unsigned int stream_codec_tag;
2025 * scene change detection threshold
2026 * 0 is default, larger means fewer detected scene changes.
2027 * - encoding: Set by user.
2028 * - decoding: unused
2030 int scenechange_threshold;
2033 * minimum Lagrange multipler
2034 * - encoding: Set by user.
2035 * - decoding: unused
2040 * maximum Lagrange multipler
2041 * - encoding: Set by user.
2042 * - decoding: unused
2046 #if FF_API_PALETTE_CONTROL
2048 * palette control structure
2049 * - encoding: ??? (no palette-enabled encoder yet)
2050 * - decoding: Set by user.
2052 struct AVPaletteControl *palctrl;
2056 * noise reduction strength
2057 * - encoding: Set by user.
2058 * - decoding: unused
2060 int noise_reduction;
2063 * Called at the beginning of a frame to get cr buffer for it.
2064 * Buffer type (size, hints) must be the same. libavcodec won't check it.
2065 * libavcodec will pass previous buffer in pic, function should return
2066 * same buffer or new buffer with old frame "painted" into it.
2067 * If pic.data[0] == NULL must behave like get_buffer().
2068 * if CODEC_CAP_DR1 is not set then reget_buffer() must call
2069 * avcodec_default_reget_buffer() instead of providing buffers allocated by
2071 * - encoding: unused
2072 * - decoding: Set by libavcodec, user can override.
2074 int (*reget_buffer)(struct AVCodecContext *c, AVFrame *pic);
2077 * Number of bits which should be loaded into the rc buffer before decoding starts.
2078 * - encoding: Set by user.
2079 * - decoding: unused
2081 int rc_initial_buffer_occupancy;
2085 * - encoding: Set by user.
2086 * - decoding: unused
2088 int inter_threshold;
2092 * - encoding: Set by user.
2093 * - decoding: Set by user.
2098 * Simulates errors in the bitstream to test error concealment.
2099 * - encoding: Set by user.
2100 * - decoding: unused
2105 * MP3 antialias algorithm, see FF_AA_* below.
2106 * - encoding: unused
2107 * - decoding: Set by user.
2110 #define FF_AA_AUTO 0
2111 #define FF_AA_FASTINT 1 //not implemented yet
2113 #define FF_AA_FLOAT 3
2115 * quantizer noise shaping
2116 * - encoding: Set by user.
2117 * - decoding: unused
2119 int quantizer_noise_shaping;
2123 * is used to decide how many independent tasks should be passed to execute()
2124 * - encoding: Set by user.
2125 * - decoding: Set by user.
2130 * The codec may call this to execute several independent things.
2131 * It will return only after finishing all tasks.
2132 * The user may replace this with some multithreaded implementation,
2133 * the default implementation will execute the parts serially.
2134 * @param count the number of things to execute
2135 * - encoding: Set by libavcodec, user can override.
2136 * - decoding: Set by libavcodec, user can override.
2138 int (*execute)(struct AVCodecContext *c, int (*func)(struct AVCodecContext *c2, void *arg), void *arg2, int *ret, int count, int size);
2142 * Can be used by execute() to store some per AVCodecContext stuff.
2143 * - encoding: set by execute()
2144 * - decoding: set by execute()
2146 void *thread_opaque;
2149 * Motion estimation threshold below which no motion estimation is
2150 * performed, but instead the user specified motion vectors are used.
2152 * - encoding: Set by user.
2153 * - decoding: unused
2158 * Macroblock threshold below which the user specified macroblock types will be used.
2159 * - encoding: Set by user.
2160 * - decoding: unused
2165 * precision of the intra DC coefficient - 8
2166 * - encoding: Set by user.
2167 * - decoding: unused
2169 int intra_dc_precision;
2172 * noise vs. sse weight for the nsse comparsion function
2173 * - encoding: Set by user.
2174 * - decoding: unused
2179 * Number of macroblock rows at the top which are skipped.
2180 * - encoding: unused
2181 * - decoding: Set by user.
2186 * Number of macroblock rows at the bottom which are skipped.
2187 * - encoding: unused
2188 * - decoding: Set by user.
2194 * - encoding: Set by user.
2195 * - decoding: Set by libavcodec.
2198 #define FF_PROFILE_UNKNOWN -99
2200 #define FF_PROFILE_AAC_MAIN 0
2201 #define FF_PROFILE_AAC_LOW 1
2202 #define FF_PROFILE_AAC_SSR 2
2203 #define FF_PROFILE_AAC_LTP 3
2205 #define FF_PROFILE_H264_BASELINE 66
2206 #define FF_PROFILE_H264_MAIN 77
2207 #define FF_PROFILE_H264_EXTENDED 88
2208 #define FF_PROFILE_H264_HIGH 100
2209 #define FF_PROFILE_H264_HIGH_10 110
2210 #define FF_PROFILE_H264_HIGH_422 122
2211 #define FF_PROFILE_H264_HIGH_444 244
2212 #define FF_PROFILE_H264_CAVLC_444 44
2216 * - encoding: Set by user.
2217 * - decoding: Set by libavcodec.
2220 #define FF_LEVEL_UNKNOWN -99
2223 * low resolution decoding, 1-> 1/2 size, 2->1/4 size
2224 * - encoding: unused
2225 * - decoding: Set by user.
2230 * Bitstream width / height, may be different from width/height if lowres
2231 * or other things are used.
2232 * - encoding: unused
2233 * - decoding: Set by user before init if known. Codec should override / dynamically change if needed.
2235 int coded_width, coded_height;
2238 * frame skip threshold
2239 * - encoding: Set by user.
2240 * - decoding: unused
2242 int frame_skip_threshold;
2246 * - encoding: Set by user.
2247 * - decoding: unused
2249 int frame_skip_factor;
2252 * frame skip exponent
2253 * - encoding: Set by user.
2254 * - decoding: unused
2259 * frame skip comparison function
2260 * - encoding: Set by user.
2261 * - decoding: unused
2266 * Border processing masking, raises the quantizer for mbs on the borders
2268 * - encoding: Set by user.
2269 * - decoding: unused
2271 float border_masking;
2274 * minimum MB lagrange multipler
2275 * - encoding: Set by user.
2276 * - decoding: unused
2281 * maximum MB lagrange multipler
2282 * - encoding: Set by user.
2283 * - decoding: unused
2289 * - encoding: Set by user.
2290 * - decoding: unused
2292 int me_penalty_compensation;
2296 * - encoding: unused
2297 * - decoding: Set by user.
2299 enum AVDiscard skip_loop_filter;
2303 * - encoding: unused
2304 * - decoding: Set by user.
2306 enum AVDiscard skip_idct;
2310 * - encoding: unused
2311 * - decoding: Set by user.
2313 enum AVDiscard skip_frame;
2317 * - encoding: Set by user.
2318 * - decoding: unused
2324 * - encoding: Set by user.
2325 * - decoding: unused
2330 * constant rate factor - quality-based VBR - values ~correspond to qps
2331 * - encoding: Set by user.
2332 * - decoding: unused
2337 * constant quantization parameter rate control method
2338 * - encoding: Set by user.
2339 * - decoding: unused
2345 * - encoding: Set by user.
2346 * - decoding: unused
2351 * number of reference frames
2352 * - encoding: Set by user.
2353 * - decoding: Set by lavc.
2358 * chroma qp offset from luma
2359 * - encoding: Set by user.
2360 * - decoding: unused
2365 * Influences how often B-frames are used.
2366 * - encoding: Set by user.
2367 * - decoding: unused
2372 * trellis RD quantization
2373 * - encoding: Set by user.
2374 * - decoding: unused
2379 * Reduce fluctuations in qp (before curve compression).
2380 * - encoding: Set by user.
2381 * - decoding: unused
2383 float complexityblur;
2386 * in-loop deblocking filter alphac0 parameter
2387 * alpha is in the range -6...6
2388 * - encoding: Set by user.
2389 * - decoding: unused
2394 * in-loop deblocking filter beta parameter
2395 * beta is in the range -6...6
2396 * - encoding: Set by user.
2397 * - decoding: unused
2402 * macroblock subpartition sizes to consider - p8x8, p4x4, b8x8, i8x8, i4x4
2403 * - encoding: Set by user.
2404 * - decoding: unused
2407 #define X264_PART_I4X4 0x001 /* Analyze i4x4 */
2408 #define X264_PART_I8X8 0x002 /* Analyze i8x8 (requires 8x8 transform) */
2409 #define X264_PART_P8X8 0x010 /* Analyze p16x8, p8x16 and p8x8 */
2410 #define X264_PART_P4X4 0x020 /* Analyze p8x4, p4x8, p4x4 */
2411 #define X264_PART_B8X8 0x100 /* Analyze b16x8, b8x16 and b8x8 */
2414 * direct MV prediction mode - 0 (none), 1 (spatial), 2 (temporal), 3 (auto)
2415 * - encoding: Set by user.
2416 * - decoding: unused
2421 * Audio cutoff bandwidth (0 means "automatic")
2422 * - encoding: Set by user.
2423 * - decoding: unused
2428 * Multiplied by qscale for each frame and added to scene_change_score.
2429 * - encoding: Set by user.
2430 * - decoding: unused
2432 int scenechange_factor;
2436 * Note: Value depends upon the compare function used for fullpel ME.
2437 * - encoding: Set by user.
2438 * - decoding: unused
2443 * Adjusts sensitivity of b_frame_strategy 1.
2444 * - encoding: Set by user.
2445 * - decoding: unused
2450 * - encoding: Set by user.
2451 * - decoding: unused
2453 int compression_level;
2454 #define FF_COMPRESSION_DEFAULT -1
2456 #if LIBAVCODEC_VERSION_MAJOR < 53
2458 * Sets whether to use LPC mode - used by FLAC encoder.
2459 * - encoding: Set by user.
2460 * - decoding: unused
2461 * @deprecated Deprecated in favor of lpc_type and lpc_passes.
2467 * LPC coefficient precision - used by FLAC encoder
2468 * - encoding: Set by user.
2469 * - decoding: unused
2471 int lpc_coeff_precision;
2474 * - encoding: Set by user.
2475 * - decoding: unused
2477 int min_prediction_order;
2480 * - encoding: Set by user.
2481 * - decoding: unused
2483 int max_prediction_order;
2486 * search method for selecting prediction order
2487 * - encoding: Set by user.
2488 * - decoding: unused
2490 int prediction_order_method;
2493 * - encoding: Set by user.
2494 * - decoding: unused
2496 int min_partition_order;
2499 * - encoding: Set by user.
2500 * - decoding: unused
2502 int max_partition_order;
2505 * GOP timecode frame start number, in non drop frame format
2506 * - encoding: Set by user.
2507 * - decoding: unused
2509 int64_t timecode_frame_start;
2511 #if LIBAVCODEC_VERSION_MAJOR < 53
2513 * Decoder should decode to this many channels if it can (0 for default)
2514 * - encoding: unused
2515 * - decoding: Set by user.
2516 * @deprecated Deprecated in favor of request_channel_layout.
2518 int request_channels;
2522 * Percentage of dynamic range compression to be applied by the decoder.
2523 * The default value is 1.0, corresponding to full compression.
2524 * - encoding: unused
2525 * - decoding: Set by user.
2530 * opaque 64bit number (generally a PTS) that will be reordered and
2531 * output in AVFrame.reordered_opaque
2532 * - encoding: unused
2533 * - decoding: Set by user.
2535 int64_t reordered_opaque;
2538 * Bits per sample/pixel of internal libavcodec pixel/sample format.
2539 * This field is applicable only when sample_fmt is SAMPLE_FMT_S32.
2540 * - encoding: set by user.
2541 * - decoding: set by libavcodec.
2543 int bits_per_raw_sample;
2546 * Audio channel layout.
2547 * - encoding: set by user.
2548 * - decoding: set by libavcodec.
2550 int64_t channel_layout;
2553 * Request decoder to use this channel layout if it can (0 for default)
2554 * - encoding: unused
2555 * - decoding: Set by user.
2557 int64_t request_channel_layout;
2560 * Ratecontrol attempt to use, at maximum, <value> of what can be used without an underflow.
2561 * - encoding: Set by user.
2562 * - decoding: unused.
2564 float rc_max_available_vbv_use;
2567 * Ratecontrol attempt to use, at least, <value> times the amount needed to prevent a vbv overflow.
2568 * - encoding: Set by user.
2569 * - decoding: unused.
2571 float rc_min_vbv_overflow_use;
2574 * Hardware accelerator in use
2575 * - encoding: unused.
2576 * - decoding: Set by libavcodec
2578 struct AVHWAccel *hwaccel;
2581 * For some codecs, the time base is closer to the field rate than the frame rate.
2582 * Most notably, H.264 and MPEG-2 specify time_base as half of frame duration
2583 * if no telecine is used ...
2585 * Set to time_base ticks per frame. Default 1, e.g., H.264/MPEG-2 set it to 2.
2587 int ticks_per_frame;
2590 * Hardware accelerator context.
2591 * For some hardware accelerators, a global context needs to be
2592 * provided by the user. In that case, this holds display-dependent
2593 * data FFmpeg cannot instantiate itself. Please refer to the
2594 * FFmpeg HW accelerator documentation to know how to fill this
2595 * is. e.g. for VA API, this is a struct vaapi_context.
2596 * - encoding: unused
2597 * - decoding: Set by user
2599 void *hwaccel_context;
2602 * Chromaticity coordinates of the source primaries.
2603 * - encoding: Set by user
2604 * - decoding: Set by libavcodec
2606 enum AVColorPrimaries color_primaries;
2609 * Color Transfer Characteristic.
2610 * - encoding: Set by user
2611 * - decoding: Set by libavcodec
2613 enum AVColorTransferCharacteristic color_trc;
2616 * YUV colorspace type.
2617 * - encoding: Set by user
2618 * - decoding: Set by libavcodec
2620 enum AVColorSpace colorspace;
2623 * MPEG vs JPEG YUV range.
2624 * - encoding: Set by user
2625 * - decoding: Set by libavcodec
2627 enum AVColorRange color_range;
2630 * This defines the location of chroma samples.
2631 * - encoding: Set by user
2632 * - decoding: Set by libavcodec
2634 enum AVChromaLocation chroma_sample_location;
2637 * The codec may call this to execute several independent things.
2638 * It will return only after finishing all tasks.
2639 * The user may replace this with some multithreaded implementation,
2640 * the default implementation will execute the parts serially.
2641 * Also see avcodec_thread_init and e.g. the --enable-pthread configure option.
2642 * @param c context passed also to func
2643 * @param count the number of things to execute
2644 * @param arg2 argument passed unchanged to func
2645 * @param ret return values of executed functions, must have space for "count" values. May be NULL.
2646 * @param func function that will be called count times, with jobnr from 0 to count-1.
2647 * threadnr will be in the range 0 to c->thread_count-1 < MAX_THREADS and so that no
2648 * two instances of func executing at the same time will have the same threadnr.
2649 * @return always 0 currently, but code should handle a future improvement where when any call to func
2650 * returns < 0 no further calls to func may be done and < 0 is returned.
2651 * - encoding: Set by libavcodec, user can override.
2652 * - decoding: Set by libavcodec, user can override.
2654 int (*execute2)(struct AVCodecContext *c, int (*func)(struct AVCodecContext *c2, void *arg, int jobnr, int threadnr), void *arg2, int *ret, int count);
2657 * explicit P-frame weighted prediction analysis method
2659 * 1: fast blind weighting (one reference duplicate with -1 offset)
2660 * 2: smart weighting (full fade detection analysis)
2661 * - encoding: Set by user.
2662 * - decoding: unused
2664 int weighted_p_pred;
2669 * 1: Variance AQ (complexity mask)
2670 * 2: Auto-variance AQ (experimental)
2671 * - encoding: Set by user
2672 * - decoding: unused
2678 * Reduces blocking and blurring in flat and textured areas.
2679 * - encoding: Set by user
2680 * - decoding: unused
2686 * Strength of psychovisual optimization
2687 * - encoding: Set by user
2688 * - decoding: unused
2694 * Strength of psychovisual optimization
2695 * - encoding: Set by user
2696 * - decoding: unused
2702 * Number of frames for frametype and ratecontrol lookahead
2703 * - encoding: Set by user
2704 * - decoding: unused
2709 * Constant rate factor maximum
2710 * With CRF encoding mode and VBV restrictions enabled, prevents quality from being worse
2711 * than crf_max, even if doing so would violate VBV restrictions.
2712 * - encoding: Set by user.
2713 * - decoding: unused
2717 int log_level_offset;
2720 * Determines which LPC analysis algorithm to use.
2721 * - encoding: Set by user
2722 * - decoding: unused
2724 enum AVLPCType lpc_type;
2727 * Number of passes to use for Cholesky factorization during LPC analysis
2728 * - encoding: Set by user
2729 * - decoding: unused
2737 typedef struct AVCodec {
2739 * Name of the codec implementation.
2740 * The name is globally unique among encoders and among decoders (but an
2741 * encoder and a decoder can share the same name).
2742 * This is the primary way to find a codec from the user perspective.
2745 enum AVMediaType type;
2748 int (*init)(AVCodecContext *);
2749 int (*encode)(AVCodecContext *, uint8_t *buf, int buf_size, void *data);
2750 int (*close)(AVCodecContext *);
2751 int (*decode)(AVCodecContext *, void *outdata, int *outdata_size, AVPacket *avpkt);
2753 * Codec capabilities.
2757 struct AVCodec *next;
2760 * Will be called when seeking
2762 void (*flush)(AVCodecContext *);
2763 const AVRational *supported_framerates; ///< array of supported framerates, or NULL if any, array is terminated by {0,0}
2764 const enum PixelFormat *pix_fmts; ///< array of supported pixel formats, or NULL if unknown, array is terminated by -1
2766 * Descriptive name for the codec, meant to be more human readable than name.
2767 * You should use the NULL_IF_CONFIG_SMALL() macro to define it.
2769 const char *long_name;
2770 const int *supported_samplerates; ///< array of supported audio samplerates, or NULL if unknown, array is terminated by 0
2771 const enum SampleFormat *sample_fmts; ///< array of supported sample formats, or NULL if unknown, array is terminated by -1
2772 const int64_t *channel_layouts; ///< array of support channel layouts, or NULL if unknown. array is terminated by 0
2773 uint8_t max_lowres; ///< maximum value for lowres supported by the decoder
2774 AVClass *priv_class; ///< AVClass for the private context
2780 typedef struct AVHWAccel {
2782 * Name of the hardware accelerated codec.
2783 * The name is globally unique among encoders and among decoders (but an
2784 * encoder and a decoder can share the same name).
2789 * Type of codec implemented by the hardware accelerator.
2791 * See AVMEDIA_TYPE_xxx
2793 enum AVMediaType type;
2796 * Codec implemented by the hardware accelerator.
2803 * Supported pixel format.
2805 * Only hardware accelerated formats are supported here.
2807 enum PixelFormat pix_fmt;
2810 * Hardware accelerated codec capabilities.
2811 * see FF_HWACCEL_CODEC_CAP_*
2815 struct AVHWAccel *next;
2818 * Called at the beginning of each frame or field picture.
2820 * Meaningful frame information (codec specific) is guaranteed to
2821 * be parsed at this point. This function is mandatory.
2823 * Note that buf can be NULL along with buf_size set to 0.
2824 * Otherwise, this means the whole frame is available at this point.
2826 * @param avctx the codec context
2827 * @param buf the frame data buffer base
2828 * @param buf_size the size of the frame in bytes
2829 * @return zero if successful, a negative value otherwise
2831 int (*start_frame)(AVCodecContext *avctx, const uint8_t *buf, uint32_t buf_size);
2834 * Callback for each slice.
2836 * Meaningful slice information (codec specific) is guaranteed to
2837 * be parsed at this point. This function is mandatory.
2839 * @param avctx the codec context
2840 * @param buf the slice data buffer base
2841 * @param buf_size the size of the slice in bytes
2842 * @return zero if successful, a negative value otherwise
2844 int (*decode_slice)(AVCodecContext *avctx, const uint8_t *buf, uint32_t buf_size);
2847 * Called at the end of each frame or field picture.
2849 * The whole picture is parsed at this point and can now be sent
2850 * to the hardware accelerator. This function is mandatory.
2852 * @param avctx the codec context
2853 * @return zero if successful, a negative value otherwise
2855 int (*end_frame)(AVCodecContext *avctx);
2858 * Size of HW accelerator private data.
2860 * Private data is allocated with av_mallocz() before
2861 * AVCodecContext.get_buffer() and deallocated after
2862 * AVCodecContext.release_buffer().
2868 * four components are given, that's all.
2869 * the last component is alpha
2871 typedef struct AVPicture {
2873 int linesize[4]; ///< number of bytes per line
2876 #if FF_API_PALETTE_CONTROL
2879 * This structure defines a method for communicating palette changes
2880 * between and demuxer and a decoder.
2882 * @deprecated Use AVPacket to send palette changes instead.
2883 * This is totally broken.
2885 #define AVPALETTE_SIZE 1024
2886 #define AVPALETTE_COUNT 256
2887 typedef struct AVPaletteControl {
2889 /* Demuxer sets this to 1 to indicate the palette has changed;
2890 * decoder resets to 0. */
2891 int palette_changed;
2893 /* 4-byte ARGB palette entries, stored in native byte order; note that
2894 * the individual palette components should be on a 8-bit scale; if
2895 * the palette data comes from an IBM VGA native format, the component
2896 * data is probably 6 bits in size and needs to be scaled. */
2897 unsigned int palette[AVPALETTE_COUNT];
2899 } AVPaletteControl attribute_deprecated;
2902 enum AVSubtitleType {
2905 SUBTITLE_BITMAP, ///< A bitmap, pict will be set
2908 * Plain text, the text field must be set by the decoder and is
2909 * authoritative. ass and pict fields may contain approximations.
2914 * Formatted text, the ass field must be set by the decoder and is
2915 * authoritative. pict and text fields may contain approximations.
2920 typedef struct AVSubtitleRect {
2921 int x; ///< top left corner of pict, undefined when pict is not set
2922 int y; ///< top left corner of pict, undefined when pict is not set
2923 int w; ///< width of pict, undefined when pict is not set
2924 int h; ///< height of pict, undefined when pict is not set
2925 int nb_colors; ///< number of colors in pict, undefined when pict is not set
2928 * data+linesize for the bitmap of this subtitle.
2929 * can be set for text/ass as well once they where rendered
2932 enum AVSubtitleType type;
2934 char *text; ///< 0 terminated plain UTF-8 text
2937 * 0 terminated ASS/SSA compatible event line.
2938 * The pressentation of this is unaffected by the other values in this
2944 typedef struct AVSubtitle {
2945 uint16_t format; /* 0 = graphics */
2946 uint32_t start_display_time; /* relative to packet pts, in ms */
2947 uint32_t end_display_time; /* relative to packet pts, in ms */
2949 AVSubtitleRect **rects;
2950 int64_t pts; ///< Same as packet pts, in AV_TIME_BASE
2953 /* packet functions */
2956 * @deprecated use NULL instead
2958 attribute_deprecated void av_destruct_packet_nofree(AVPacket *pkt);
2961 * Default packet destructor.
2963 void av_destruct_packet(AVPacket *pkt);
2966 * Initialize optional fields of a packet with default values.
2970 void av_init_packet(AVPacket *pkt);
2973 * Allocate the payload of a packet and initialize its fields with
2977 * @param size wanted payload size
2978 * @return 0 if OK, AVERROR_xxx otherwise
2980 int av_new_packet(AVPacket *pkt, int size);
2983 * Reduce packet size, correctly zeroing padding
2986 * @param size new size
2988 void av_shrink_packet(AVPacket *pkt, int size);
2991 * @warning This is a hack - the packet memory allocation stuff is broken. The
2992 * packet is allocated if it was not really allocated.
2994 int av_dup_packet(AVPacket *pkt);
2999 * @param pkt packet to free
3001 void av_free_packet(AVPacket *pkt);
3005 struct ReSampleContext;
3006 struct AVResampleContext;
3008 typedef struct ReSampleContext ReSampleContext;
3010 #if FF_API_AUDIO_OLD
3012 * @deprecated Use av_audio_resample_init() instead.
3014 attribute_deprecated ReSampleContext *audio_resample_init(int output_channels, int input_channels,
3015 int output_rate, int input_rate);
3018 * Initialize audio resampling context
3020 * @param output_channels number of output channels
3021 * @param input_channels number of input channels
3022 * @param output_rate output sample rate
3023 * @param input_rate input sample rate
3024 * @param sample_fmt_out requested output sample format
3025 * @param sample_fmt_in input sample format
3026 * @param filter_length length of each FIR filter in the filterbank relative to the cutoff freq
3027 * @param log2_phase_count log2 of the number of entries in the polyphase filterbank
3028 * @param linear If 1 then the used FIR filter will be linearly interpolated
3029 between the 2 closest, if 0 the closest will be used
3030 * @param cutoff cutoff frequency, 1.0 corresponds to half the output sampling rate
3031 * @return allocated ReSampleContext, NULL if error occured
3033 ReSampleContext *av_audio_resample_init(int output_channels, int input_channels,
3034 int output_rate, int input_rate,
3035 enum SampleFormat sample_fmt_out,
3036 enum SampleFormat sample_fmt_in,
3037 int filter_length, int log2_phase_count,
3038 int linear, double cutoff);
3040 int audio_resample(ReSampleContext *s, short *output, short *input, int nb_samples);
3041 void audio_resample_close(ReSampleContext *s);
3045 * Initialize an audio resampler.
3046 * Note, if either rate is not an integer then simply scale both rates up so they are.
3047 * @param filter_length length of each FIR filter in the filterbank relative to the cutoff freq
3048 * @param log2_phase_count log2 of the number of entries in the polyphase filterbank
3049 * @param linear If 1 then the used FIR filter will be linearly interpolated
3050 between the 2 closest, if 0 the closest will be used
3051 * @param cutoff cutoff frequency, 1.0 corresponds to half the output sampling rate
3053 struct AVResampleContext *av_resample_init(int out_rate, int in_rate, int filter_length, int log2_phase_count, int linear, double cutoff);
3056 * Resample an array of samples using a previously configured context.
3057 * @param src an array of unconsumed samples
3058 * @param consumed the number of samples of src which have been consumed are returned here
3059 * @param src_size the number of unconsumed samples available
3060 * @param dst_size the amount of space in samples available in dst
3061 * @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.
3062 * @return the number of samples written in dst or -1 if an error occurred
3064 int av_resample(struct AVResampleContext *c, short *dst, short *src, int *consumed, int src_size, int dst_size, int update_ctx);
3068 * Compensate samplerate/timestamp drift. The compensation is done by changing
3069 * the resampler parameters, so no audible clicks or similar distortions occur
3070 * @param compensation_distance distance in output samples over which the compensation should be performed
3071 * @param sample_delta number of output samples which should be output less
3073 * example: av_resample_compensate(c, 10, 500)
3074 * here instead of 510 samples only 500 samples would be output
3076 * note, due to rounding the actual compensation might be slightly different,
3077 * especially if the compensation_distance is large and the in_rate used during init is small
3079 void av_resample_compensate(struct AVResampleContext *c, int sample_delta, int compensation_distance);
3080 void av_resample_close(struct AVResampleContext *c);
3083 * Allocate memory for a picture. Call avpicture_free to free it.
3085 * @param picture the picture to be filled in
3086 * @param pix_fmt the format of the picture
3087 * @param width the width of the picture
3088 * @param height the height of the picture
3089 * @return zero if successful, a negative value if not
3091 int avpicture_alloc(AVPicture *picture, enum PixelFormat pix_fmt, int width, int height);
3094 * Free a picture previously allocated by avpicture_alloc().
3096 * @param picture the AVPicture to be freed
3098 void avpicture_free(AVPicture *picture);
3101 * Fill in the AVPicture fields.
3102 * The fields of the given AVPicture are filled in by using the 'ptr' address
3103 * which points to the image data buffer. Depending on the specified picture
3104 * format, one or multiple image data pointers and line sizes will be set.
3105 * If a planar format is specified, several pointers will be set pointing to
3106 * the different picture planes and the line sizes of the different planes
3107 * will be stored in the lines_sizes array.
3108 * Call with ptr == NULL to get the required size for the ptr buffer.
3110 * @param picture AVPicture whose fields are to be filled in
3111 * @param ptr Buffer which will contain or contains the actual image data
3112 * @param pix_fmt The format in which the picture data is stored.
3113 * @param width the width of the image in pixels
3114 * @param height the height of the image in pixels
3115 * @return size of the image data in bytes
3117 int avpicture_fill(AVPicture *picture, uint8_t *ptr,
3118 enum PixelFormat pix_fmt, int width, int height);
3119 int avpicture_layout(const AVPicture* src, enum PixelFormat pix_fmt, int width, int height,
3120 unsigned char *dest, int dest_size);
3123 * Calculate the size in bytes that a picture of the given width and height
3124 * would occupy if stored in the given picture format.
3125 * Note that this returns the size of a compact representation as generated
3126 * by avpicture_layout, which can be smaller than the size required for e.g.
3129 * @param pix_fmt the given picture format
3130 * @param width the width of the image
3131 * @param height the height of the image
3132 * @return Image data size in bytes or -1 on error (e.g. too large dimensions).
3134 int avpicture_get_size(enum PixelFormat pix_fmt, int width, int height);
3135 void avcodec_get_chroma_sub_sample(enum PixelFormat pix_fmt, int *h_shift, int *v_shift);
3136 const char *avcodec_get_pix_fmt_name(enum PixelFormat pix_fmt);
3137 void avcodec_set_dimensions(AVCodecContext *s, int width, int height);
3139 #if LIBAVCODEC_VERSION_MAJOR < 53
3141 * Return the pixel format corresponding to the name name.
3143 * If there is no pixel format with name name, then look for a
3144 * pixel format with the name corresponding to the native endian
3146 * For example in a little-endian system, first look for "gray16",
3147 * then for "gray16le".
3149 * Finally if no pixel format has been found, return PIX_FMT_NONE.
3151 * @deprecated Deprecated in favor of av_get_pix_fmt().
3153 attribute_deprecated enum PixelFormat avcodec_get_pix_fmt(const char* name);
3157 * Return a value representing the fourCC code associated to the
3158 * pixel format pix_fmt, or 0 if no associated fourCC code can be
3161 unsigned int avcodec_pix_fmt_to_codec_tag(enum PixelFormat pix_fmt);
3164 * Put a string representing the codec tag codec_tag in buf.
3166 * @param buf_size size in bytes of buf
3167 * @return the length of the string that would have been generated if
3168 * enough space had been available, excluding the trailing null
3170 size_t av_get_codec_tag_string(char *buf, size_t buf_size, unsigned int codec_tag);
3172 #define FF_LOSS_RESOLUTION 0x0001 /**< loss due to resolution change */
3173 #define FF_LOSS_DEPTH 0x0002 /**< loss due to color depth change */
3174 #define FF_LOSS_COLORSPACE 0x0004 /**< loss due to color space conversion */
3175 #define FF_LOSS_ALPHA 0x0008 /**< loss of alpha bits */
3176 #define FF_LOSS_COLORQUANT 0x0010 /**< loss due to color quantization */
3177 #define FF_LOSS_CHROMA 0x0020 /**< loss of chroma (e.g. RGB to gray conversion) */
3180 * Compute what kind of losses will occur when converting from one specific
3181 * pixel format to another.
3182 * When converting from one pixel format to another, information loss may occur.
3183 * For example, when converting from RGB24 to GRAY, the color information will
3184 * be lost. Similarly, other losses occur when converting from some formats to
3185 * other formats. These losses can involve loss of chroma, but also loss of
3186 * resolution, loss of color depth, loss due to the color space conversion, loss
3187 * of the alpha bits or loss due to color quantization.
3188 * avcodec_get_fix_fmt_loss() informs you about the various types of losses
3189 * which will occur when converting from one pixel format to another.
3191 * @param[in] dst_pix_fmt destination pixel format
3192 * @param[in] src_pix_fmt source pixel format
3193 * @param[in] has_alpha Whether the source pixel format alpha channel is used.
3194 * @return Combination of flags informing you what kind of losses will occur.
3196 int avcodec_get_pix_fmt_loss(enum PixelFormat dst_pix_fmt, enum PixelFormat src_pix_fmt,
3200 * Find the best pixel format to convert to given a certain source pixel
3201 * format. When converting from one pixel format to another, information loss
3202 * may occur. For example, when converting from RGB24 to GRAY, the color
3203 * information will be lost. Similarly, other losses occur when converting from
3204 * some formats to other formats. avcodec_find_best_pix_fmt() searches which of
3205 * the given pixel formats should be used to suffer the least amount of loss.
3206 * The pixel formats from which it chooses one, are determined by the
3207 * pix_fmt_mask parameter.
3210 * src_pix_fmt = PIX_FMT_YUV420P;
3211 * pix_fmt_mask = (1 << PIX_FMT_YUV422P) || (1 << PIX_FMT_RGB24);
3212 * dst_pix_fmt = avcodec_find_best_pix_fmt(pix_fmt_mask, src_pix_fmt, alpha, &loss);
3215 * @param[in] pix_fmt_mask bitmask determining which pixel format to choose from
3216 * @param[in] src_pix_fmt source pixel format
3217 * @param[in] has_alpha Whether the source pixel format alpha channel is used.
3218 * @param[out] loss_ptr Combination of flags informing you what kind of losses will occur.
3219 * @return The best pixel format to convert to or -1 if none was found.
3221 enum PixelFormat avcodec_find_best_pix_fmt(int64_t pix_fmt_mask, enum PixelFormat src_pix_fmt,
3222 int has_alpha, int *loss_ptr);
3226 * Print in buf the string corresponding to the pixel format with
3227 * number pix_fmt, or an header if pix_fmt is negative.
3229 * @param[in] buf the buffer where to write the string
3230 * @param[in] buf_size the size of buf
3231 * @param[in] pix_fmt the number of the pixel format to print the corresponding info string, or
3232 * a negative value to print the corresponding header.
3233 * Meaningful values for obtaining a pixel format info vary from 0 to PIX_FMT_NB -1.
3235 void avcodec_pix_fmt_string (char *buf, int buf_size, enum PixelFormat pix_fmt);
3237 #define FF_ALPHA_TRANSP 0x0001 /* image has some totally transparent pixels */
3238 #define FF_ALPHA_SEMI_TRANSP 0x0002 /* image has some transparent pixels */
3241 * Tell if an image really has transparent alpha values.
3242 * @return ored mask of FF_ALPHA_xxx constants
3244 int img_get_alpha_info(const AVPicture *src,
3245 enum PixelFormat pix_fmt, int width, int height);
3247 /* deinterlace a picture */
3248 /* deinterlace - if not supported return -1 */
3249 int avpicture_deinterlace(AVPicture *dst, const AVPicture *src,
3250 enum PixelFormat pix_fmt, int width, int height);
3252 /* external high level API */
3255 * If c is NULL, returns the first registered codec,
3256 * if c is non-NULL, returns the next registered codec after c,
3257 * or NULL if c is the last one.
3259 AVCodec *av_codec_next(AVCodec *c);
3262 * Return the LIBAVCODEC_VERSION_INT constant.
3264 unsigned avcodec_version(void);
3267 * Return the libavcodec build-time configuration.
3269 const char *avcodec_configuration(void);
3272 * Return the libavcodec license.
3274 const char *avcodec_license(void);
3277 * Initialize libavcodec.
3279 * @warning This function must be called before any other libavcodec
3282 void avcodec_init(void);
3284 #if LIBAVCODEC_VERSION_MAJOR < 53
3286 * @deprecated Deprecated in favor of avcodec_register().
3288 attribute_deprecated void register_avcodec(AVCodec *codec);
3292 * Register the codec codec and initialize libavcodec.
3294 * @see avcodec_init()
3296 void avcodec_register(AVCodec *codec);
3299 * Find a registered encoder with a matching codec ID.
3301 * @param id CodecID of the requested encoder
3302 * @return An encoder if one was found, NULL otherwise.
3304 AVCodec *avcodec_find_encoder(enum CodecID id);
3307 * Find a registered encoder with the specified name.
3309 * @param name name of the requested encoder
3310 * @return An encoder if one was found, NULL otherwise.
3312 AVCodec *avcodec_find_encoder_by_name(const char *name);
3315 * Find a registered decoder with a matching codec ID.
3317 * @param id CodecID of the requested decoder
3318 * @return A decoder if one was found, NULL otherwise.
3320 AVCodec *avcodec_find_decoder(enum CodecID id);
3323 * Find a registered decoder with the specified name.
3325 * @param name name of the requested decoder
3326 * @return A decoder if one was found, NULL otherwise.
3328 AVCodec *avcodec_find_decoder_by_name(const char *name);
3329 void avcodec_string(char *buf, int buf_size, AVCodecContext *enc, int encode);
3332 * Set the fields of the given AVCodecContext to default values.
3334 * @param s The AVCodecContext of which the fields should be set to default values.
3336 void avcodec_get_context_defaults(AVCodecContext *s);
3338 /** THIS FUNCTION IS NOT YET PART OF THE PUBLIC API!
3339 * we WILL change its arguments and name a few times! */
3340 void avcodec_get_context_defaults2(AVCodecContext *s, enum AVMediaType);
3342 /** THIS FUNCTION IS NOT YET PART OF THE PUBLIC API!
3343 * we WILL change its arguments and name a few times! */
3344 int avcodec_get_context_defaults3(AVCodecContext *s, AVCodec *codec);
3347 * Allocate an AVCodecContext and set its fields to default values. The
3348 * resulting struct can be deallocated by simply calling av_free().
3350 * @return An AVCodecContext filled with default values or NULL on failure.
3351 * @see avcodec_get_context_defaults
3353 AVCodecContext *avcodec_alloc_context(void);
3355 /** THIS FUNCTION IS NOT YET PART OF THE PUBLIC API!
3356 * we WILL change its arguments and name a few times! */
3357 AVCodecContext *avcodec_alloc_context2(enum AVMediaType);
3359 /** THIS FUNCTION IS NOT YET PART OF THE PUBLIC API!
3360 * we WILL change its arguments and name a few times! */
3361 AVCodecContext *avcodec_alloc_context3(AVCodec *codec);
3364 * Copy the settings of the source AVCodecContext into the destination
3365 * AVCodecContext. The resulting destination codec context will be
3366 * unopened, i.e. you are required to call avcodec_open() before you
3367 * can use this AVCodecContext to decode/encode video/audio data.
3369 * @param dest target codec context, should be initialized with
3370 * avcodec_alloc_context(), but otherwise uninitialized
3371 * @param src source codec context
3372 * @return AVERROR() on error (e.g. memory allocation error), 0 on success
3374 int avcodec_copy_context(AVCodecContext *dest, const AVCodecContext *src);
3377 * Set the fields of the given AVFrame to default values.
3379 * @param pic The AVFrame of which the fields should be set to default values.
3381 void avcodec_get_frame_defaults(AVFrame *pic);
3384 * Allocate an AVFrame and set its fields to default values. The resulting
3385 * struct can be deallocated by simply calling av_free().
3387 * @return An AVFrame filled with default values or NULL on failure.
3388 * @see avcodec_get_frame_defaults
3390 AVFrame *avcodec_alloc_frame(void);
3392 int avcodec_default_get_buffer(AVCodecContext *s, AVFrame *pic);
3393 void avcodec_default_release_buffer(AVCodecContext *s, AVFrame *pic);
3394 int avcodec_default_reget_buffer(AVCodecContext *s, AVFrame *pic);
3397 * Return the amount of padding in pixels which the get_buffer callback must
3398 * provide around the edge of the image for codecs which do not have the
3399 * CODEC_FLAG_EMU_EDGE flag.
3401 * @return Required padding in pixels.
3403 unsigned avcodec_get_edge_width(void);
3405 * Modify width and height values so that they will result in a memory
3406 * buffer that is acceptable for the codec if you do not use any horizontal
3409 * May only be used if a codec with CODEC_CAP_DR1 has been opened.
3410 * If CODEC_FLAG_EMU_EDGE is not set, the dimensions must have been increased
3411 * according to avcodec_get_edge_width() before.
3413 void avcodec_align_dimensions(AVCodecContext *s, int *width, int *height);
3415 * Modify width and height values so that they will result in a memory
3416 * buffer that is acceptable for the codec if you also ensure that all
3417 * line sizes are a multiple of the respective linesize_align[i].
3419 * May only be used if a codec with CODEC_CAP_DR1 has been opened.
3420 * If CODEC_FLAG_EMU_EDGE is not set, the dimensions must have been increased
3421 * according to avcodec_get_edge_width() before.
3423 void avcodec_align_dimensions2(AVCodecContext *s, int *width, int *height,
3424 int linesize_align[4]);
3426 #if LIBAVCODEC_VERSION_MAJOR < 53
3428 * @deprecated Deprecated in favor of av_check_image_size().
3430 attribute_deprecated
3431 int avcodec_check_dimensions(void *av_log_ctx, unsigned int w, unsigned int h);
3434 enum PixelFormat avcodec_default_get_format(struct AVCodecContext *s, const enum PixelFormat * fmt);
3436 int avcodec_thread_init(AVCodecContext *s, int thread_count);
3437 void avcodec_thread_free(AVCodecContext *s);
3438 int avcodec_default_execute(AVCodecContext *c, int (*func)(AVCodecContext *c2, void *arg2),void *arg, int *ret, int count, int size);
3439 int avcodec_default_execute2(AVCodecContext *c, int (*func)(AVCodecContext *c2, void *arg2, int, int),void *arg, int *ret, int count);
3440 //FIXME func typedef
3443 * Initialize the AVCodecContext to use the given AVCodec. Prior to using this
3444 * function the context has to be allocated.
3446 * The functions avcodec_find_decoder_by_name(), avcodec_find_encoder_by_name(),
3447 * avcodec_find_decoder() and avcodec_find_encoder() provide an easy way for
3448 * retrieving a codec.
3450 * @warning This function is not thread safe!
3453 * avcodec_register_all();
3454 * codec = avcodec_find_decoder(CODEC_ID_H264);
3458 * context = avcodec_alloc_context();
3460 * if (avcodec_open(context, codec) < 0)
3464 * @param avctx The context which will be set up to use the given codec.
3465 * @param codec The codec to use within the context.
3466 * @return zero on success, a negative value on error
3467 * @see avcodec_alloc_context, avcodec_find_decoder, avcodec_find_encoder
3469 int avcodec_open(AVCodecContext *avctx, AVCodec *codec);
3471 #if FF_API_AUDIO_OLD
3473 * Decode an audio frame from buf into samples.
3474 * Wrapper function which calls avcodec_decode_audio3.
3476 * @deprecated Use avcodec_decode_audio3 instead.
3477 * @param avctx the codec context
3478 * @param[out] samples the output buffer
3479 * @param[in,out] frame_size_ptr the output buffer size in bytes
3480 * @param[in] buf the input buffer
3481 * @param[in] buf_size the input buffer size in bytes
3482 * @return On error a negative value is returned, otherwise the number of bytes
3483 * used or zero if no frame could be decompressed.
3485 attribute_deprecated int avcodec_decode_audio2(AVCodecContext *avctx, int16_t *samples,
3486 int *frame_size_ptr,
3487 const uint8_t *buf, int buf_size);
3491 * Decode the audio frame of size avpkt->size from avpkt->data into samples.
3492 * Some decoders may support multiple frames in a single AVPacket, such
3493 * decoders would then just decode the first frame. In this case,
3494 * avcodec_decode_audio3 has to be called again with an AVPacket that contains
3495 * the remaining data in order to decode the second frame etc.
3497 * could be outputted, frame_size_ptr is zero. Otherwise, it is the
3498 * decompressed frame size in bytes.
3500 * @warning You must set frame_size_ptr to the allocated size of the
3501 * output buffer before calling avcodec_decode_audio3().
3503 * @warning The input buffer must be FF_INPUT_BUFFER_PADDING_SIZE larger than
3504 * the actual read bytes because some optimized bitstream readers read 32 or 64
3505 * bits at once and could read over the end.
3507 * @warning The end of the input buffer avpkt->data should be set to 0 to ensure that
3508 * no overreading happens for damaged MPEG streams.
3510 * @note You might have to align the input buffer avpkt->data and output buffer
3511 * samples. The alignment requirements depend on the CPU: On some CPUs it isn't
3512 * necessary at all, on others it won't work at all if not aligned and on others
3513 * it will work but it will have an impact on performance.
3515 * In practice, avpkt->data should have 4 byte alignment at minimum and
3516 * samples should be 16 byte aligned unless the CPU doesn't need it
3517 * (AltiVec and SSE do).
3519 * @param avctx the codec context
3520 * @param[out] samples the output buffer, sample type in avctx->sample_fmt
3521 * @param[in,out] frame_size_ptr the output buffer size in bytes
3522 * @param[in] avpkt The input AVPacket containing the input buffer.
3523 * You can create such packet with av_init_packet() and by then setting
3524 * data and size, some decoders might in addition need other fields.
3525 * All decoders are designed to use the least fields possible though.
3526 * @return On error a negative value is returned, otherwise the number of bytes
3527 * used or zero if no frame data was decompressed (used) from the input AVPacket.
3529 int avcodec_decode_audio3(AVCodecContext *avctx, int16_t *samples,
3530 int *frame_size_ptr,
3533 #if FF_API_VIDEO_OLD
3535 * Decode a video frame from buf into picture.
3536 * Wrapper function which calls avcodec_decode_video2.
3538 * @deprecated Use avcodec_decode_video2 instead.
3539 * @param avctx the codec context
3540 * @param[out] picture The AVFrame in which the decoded video frame will be stored.
3541 * @param[in] buf the input buffer
3542 * @param[in] buf_size the size of the input buffer in bytes
3543 * @param[in,out] got_picture_ptr Zero if no frame could be decompressed, otherwise, it is nonzero.
3544 * @return On error a negative value is returned, otherwise the number of bytes
3545 * used or zero if no frame could be decompressed.
3547 attribute_deprecated int avcodec_decode_video(AVCodecContext *avctx, AVFrame *picture,
3548 int *got_picture_ptr,
3549 const uint8_t *buf, int buf_size);
3553 * Decode the video frame of size avpkt->size from avpkt->data into picture.
3554 * Some decoders may support multiple frames in a single AVPacket, such
3555 * decoders would then just decode the first frame.
3557 * @warning The input buffer must be FF_INPUT_BUFFER_PADDING_SIZE larger than
3558 * the actual read bytes because some optimized bitstream readers read 32 or 64
3559 * bits at once and could read over the end.
3561 * @warning The end of the input buffer buf should be set to 0 to ensure that
3562 * no overreading happens for damaged MPEG streams.
3564 * @note You might have to align the input buffer avpkt->data.
3565 * The alignment requirements depend on the CPU: on some CPUs it isn't
3566 * necessary at all, on others it won't work at all if not aligned and on others
3567 * it will work but it will have an impact on performance.
3569 * In practice, avpkt->data should have 4 byte alignment at minimum.
3571 * @note Some codecs have a delay between input and output, these need to be
3572 * fed with avpkt->data=NULL, avpkt->size=0 at the end to return the remaining frames.
3574 * @param avctx the codec context
3575 * @param[out] picture The AVFrame in which the decoded video frame will be stored.
3576 * Use avcodec_alloc_frame to get an AVFrame, the codec will
3577 * allocate memory for the actual bitmap.
3578 * with default get/release_buffer(), the decoder frees/reuses the bitmap as it sees fit.
3579 * with overridden get/release_buffer() (needs CODEC_CAP_DR1) the user decides into what buffer the decoder
3580 * decodes and the decoder tells the user once it does not need the data anymore,
3581 * the user app can at this point free/reuse/keep the memory as it sees fit.
3583 * @param[in] avpkt The input AVpacket containing the input buffer.
3584 * You can create such packet with av_init_packet() and by then setting
3585 * data and size, some decoders might in addition need other fields like
3586 * flags&AV_PKT_FLAG_KEY. All decoders are designed to use the least
3588 * @param[in,out] got_picture_ptr Zero if no frame could be decompressed, otherwise, it is nonzero.
3589 * @return On error a negative value is returned, otherwise the number of bytes
3590 * used or zero if no frame could be decompressed.
3592 int avcodec_decode_video2(AVCodecContext *avctx, AVFrame *picture,
3593 int *got_picture_ptr,
3596 #if FF_API_SUBTITLE_OLD
3597 /* Decode a subtitle message. Return -1 if error, otherwise return the
3598 * number of bytes used. If no subtitle could be decompressed,
3599 * got_sub_ptr is zero. Otherwise, the subtitle is stored in *sub. */
3600 attribute_deprecated int avcodec_decode_subtitle(AVCodecContext *avctx, AVSubtitle *sub,
3602 const uint8_t *buf, int buf_size);
3606 * Decode a subtitle message.
3607 * Return a negative value on error, otherwise return the number of bytes used.
3608 * If no subtitle could be decompressed, got_sub_ptr is zero.
3609 * Otherwise, the subtitle is stored in *sub.
3610 * Note that CODEC_CAP_DR1 is not available for subtitle codecs. This is for
3611 * simplicity, because the performance difference is expect to be negligible
3612 * and reusing a get_buffer written for video codecs would probably perform badly
3613 * due to a potentially very different allocation pattern.
3615 * @param avctx the codec context
3616 * @param[out] sub The AVSubtitle in which the decoded subtitle will be stored, must be
3617 freed with avsubtitle_free if *got_sub_ptr is set.
3618 * @param[in,out] got_sub_ptr Zero if no subtitle could be decompressed, otherwise, it is nonzero.
3619 * @param[in] avpkt The input AVPacket containing the input buffer.
3621 int avcodec_decode_subtitle2(AVCodecContext *avctx, AVSubtitle *sub,
3626 * Frees all allocated data in the given subtitle struct.
3628 * @param sub AVSubtitle to free.
3630 void avsubtitle_free(AVSubtitle *sub);
3632 int avcodec_parse_frame(AVCodecContext *avctx, uint8_t **pdata,
3634 uint8_t *buf, int buf_size);
3637 * Encode an audio frame from samples into buf.
3639 * @note The output buffer should be at least FF_MIN_BUFFER_SIZE bytes large.
3640 * However, for PCM audio the user will know how much space is needed
3641 * because it depends on the value passed in buf_size as described
3642 * below. In that case a lower value can be used.
3644 * @param avctx the codec context
3645 * @param[out] buf the output buffer
3646 * @param[in] buf_size the output buffer size
3647 * @param[in] samples the input buffer containing the samples
3648 * The number of samples read from this buffer is frame_size*channels,
3649 * both of which are defined in avctx.
3650 * For PCM audio the number of samples read from samples is equal to
3651 * buf_size * input_sample_size / output_sample_size.
3652 * @return On error a negative value is returned, on success zero or the number
3653 * of bytes used to encode the data read from the input buffer.
3655 int avcodec_encode_audio(AVCodecContext *avctx, uint8_t *buf, int buf_size,
3656 const short *samples);
3659 * Encode a video frame from pict into buf.
3660 * The input picture should be
3661 * stored using a specific format, namely avctx.pix_fmt.
3663 * @param avctx the codec context
3664 * @param[out] buf the output buffer for the bitstream of encoded frame
3665 * @param[in] buf_size the size of the output buffer in bytes
3666 * @param[in] pict the input picture to encode
3667 * @return On error a negative value is returned, on success zero or the number
3668 * of bytes used from the output buffer.
3670 int avcodec_encode_video(AVCodecContext *avctx, uint8_t *buf, int buf_size,
3671 const AVFrame *pict);
3672 int avcodec_encode_subtitle(AVCodecContext *avctx, uint8_t *buf, int buf_size,
3673 const AVSubtitle *sub);
3675 int avcodec_close(AVCodecContext *avctx);
3678 * Register all the codecs, parsers and bitstream filters which were enabled at
3679 * configuration time. If you do not call this function you can select exactly
3680 * which formats you want to support, by using the individual registration
3683 * @see avcodec_register
3684 * @see av_register_codec_parser
3685 * @see av_register_bitstream_filter
3687 void avcodec_register_all(void);
3690 * Flush buffers, should be called when seeking or when switching to a different stream.
3692 void avcodec_flush_buffers(AVCodecContext *avctx);
3694 void avcodec_default_free_buffers(AVCodecContext *s);
3696 /* misc useful functions */
3699 * Return a single letter to describe the given picture type pict_type.
3701 * @param[in] pict_type the picture type
3702 * @return A single character representing the picture type.
3704 char av_get_pict_type_char(int pict_type);
3707 * Return codec bits per sample.
3709 * @param[in] codec_id the codec
3710 * @return Number of bits per sample or zero if unknown for the given codec.
3712 int av_get_bits_per_sample(enum CodecID codec_id);
3715 * Return sample format bits per sample.
3717 * @param[in] sample_fmt the sample format
3718 * @return Number of bits per sample or zero if unknown for the given sample format.
3720 int av_get_bits_per_sample_format(enum SampleFormat sample_fmt);
3723 typedef struct AVCodecParserContext {
3725 struct AVCodecParser *parser;
3726 int64_t frame_offset; /* offset of the current frame */
3727 int64_t cur_offset; /* current offset
3728 (incremented by each av_parser_parse()) */
3729 int64_t next_frame_offset; /* offset of the next frame */
3731 int pict_type; /* XXX: Put it back in AVCodecContext. */
3733 * This field is used for proper frame duration computation in lavf.
3734 * It signals, how much longer the frame duration of the current frame
3735 * is compared to normal frame duration.
3737 * frame_duration = (1 + repeat_pict) * time_base
3739 * It is used by codecs like H.264 to display telecined material.
3741 int repeat_pict; /* XXX: Put it back in AVCodecContext. */
3742 int64_t pts; /* pts of the current frame */
3743 int64_t dts; /* dts of the current frame */
3748 int fetch_timestamp;
3750 #define AV_PARSER_PTS_NB 4
3751 int cur_frame_start_index;
3752 int64_t cur_frame_offset[AV_PARSER_PTS_NB];
3753 int64_t cur_frame_pts[AV_PARSER_PTS_NB];
3754 int64_t cur_frame_dts[AV_PARSER_PTS_NB];
3757 #define PARSER_FLAG_COMPLETE_FRAMES 0x0001
3758 #define PARSER_FLAG_ONCE 0x0002
3759 /// Set if the parser has a valid file offset
3760 #define PARSER_FLAG_FETCHED_OFFSET 0x0004
3762 int64_t offset; ///< byte offset from starting packet start
3763 int64_t cur_frame_end[AV_PARSER_PTS_NB];
3766 * Set by parser to 1 for key frames and 0 for non-key frames.
3767 * It is initialized to -1, so if the parser doesn't set this flag,
3768 * old-style fallback using FF_I_TYPE picture type as key frames
3774 * Time difference in stream time base units from the pts of this
3775 * packet to the point at which the output from the decoder has converged
3776 * independent from the availability of previous frames. That is, the
3777 * frames are virtually identical no matter if decoding started from
3778 * the very first frame or from this keyframe.
3779 * Is AV_NOPTS_VALUE if unknown.
3780 * This field is not the display duration of the current frame.
3781 * This field has no meaning if the packet does not have AV_PKT_FLAG_KEY
3784 * The purpose of this field is to allow seeking in streams that have no
3785 * keyframes in the conventional sense. It corresponds to the
3786 * recovery point SEI in H.264 and match_time_delta in NUT. It is also
3787 * essential for some types of subtitle streams to ensure that all
3788 * subtitles are correctly displayed after seeking.
3790 int64_t convergence_duration;
3792 // Timestamp generation support:
3794 * Synchronization point for start of timestamp generation.
3796 * Set to >0 for sync point, 0 for no sync point and <0 for undefined
3799 * For example, this corresponds to presence of H.264 buffering period
3805 * Offset of the current timestamp against last timestamp sync point in
3806 * units of AVCodecContext.time_base.
3808 * Set to INT_MIN when dts_sync_point unused. Otherwise, it must
3809 * contain a valid timestamp offset.
3811 * Note that the timestamp of sync point has usually a nonzero
3812 * dts_ref_dts_delta, which refers to the previous sync point. Offset of
3813 * the next frame after timestamp sync point will be usually 1.
3815 * For example, this corresponds to H.264 cpb_removal_delay.
3817 int dts_ref_dts_delta;
3820 * Presentation delay of current frame in units of AVCodecContext.time_base.
3822 * Set to INT_MIN when dts_sync_point unused. Otherwise, it must
3823 * contain valid non-negative timestamp delta (presentation time of a frame
3824 * must not lie in the past).
3826 * This delay represents the difference between decoding and presentation
3827 * time of the frame.
3829 * For example, this corresponds to H.264 dpb_output_delay.
3834 * Position of the packet in file.
3836 * Analogous to cur_frame_pts/dts
3838 int64_t cur_frame_pos[AV_PARSER_PTS_NB];
3841 * Byte position of currently parsed frame in stream.
3846 * Previous frame byte position.
3849 } AVCodecParserContext;
3851 typedef struct AVCodecParser {
3852 int codec_ids[5]; /* several codec IDs are permitted */
3854 int (*parser_init)(AVCodecParserContext *s);
3855 int (*parser_parse)(AVCodecParserContext *s,
3856 AVCodecContext *avctx,
3857 const uint8_t **poutbuf, int *poutbuf_size,
3858 const uint8_t *buf, int buf_size);
3859 void (*parser_close)(AVCodecParserContext *s);
3860 int (*split)(AVCodecContext *avctx, const uint8_t *buf, int buf_size);
3861 struct AVCodecParser *next;
3864 AVCodecParser *av_parser_next(AVCodecParser *c);
3866 void av_register_codec_parser(AVCodecParser *parser);
3867 AVCodecParserContext *av_parser_init(int codec_id);
3869 #if LIBAVCODEC_VERSION_MAJOR < 53
3870 attribute_deprecated
3871 int av_parser_parse(AVCodecParserContext *s,
3872 AVCodecContext *avctx,
3873 uint8_t **poutbuf, int *poutbuf_size,
3874 const uint8_t *buf, int buf_size,
3875 int64_t pts, int64_t dts);
3881 * @param s parser context.
3882 * @param avctx codec context.
3883 * @param poutbuf set to pointer to parsed buffer or NULL if not yet finished.
3884 * @param poutbuf_size set to size of parsed buffer or zero if not yet finished.
3885 * @param buf input buffer.
3886 * @param buf_size input length, to signal EOF, this should be 0 (so that the last frame can be output).
3887 * @param pts input presentation timestamp.
3888 * @param dts input decoding timestamp.
3889 * @param pos input byte position in stream.
3890 * @return the number of bytes of the input bitstream used.
3895 * len = av_parser_parse2(myparser, AVCodecContext, &data, &size,
3902 * decode_frame(data, size);
3906 int av_parser_parse2(AVCodecParserContext *s,
3907 AVCodecContext *avctx,
3908 uint8_t **poutbuf, int *poutbuf_size,
3909 const uint8_t *buf, int buf_size,
3910 int64_t pts, int64_t dts,
3913 int av_parser_change(AVCodecParserContext *s,
3914 AVCodecContext *avctx,
3915 uint8_t **poutbuf, int *poutbuf_size,
3916 const uint8_t *buf, int buf_size, int keyframe);
3917 void av_parser_close(AVCodecParserContext *s);
3920 typedef struct AVBitStreamFilterContext {
3922 struct AVBitStreamFilter *filter;
3923 AVCodecParserContext *parser;
3924 struct AVBitStreamFilterContext *next;
3925 } AVBitStreamFilterContext;
3928 typedef struct AVBitStreamFilter {
3931 int (*filter)(AVBitStreamFilterContext *bsfc,
3932 AVCodecContext *avctx, const char *args,
3933 uint8_t **poutbuf, int *poutbuf_size,
3934 const uint8_t *buf, int buf_size, int keyframe);
3935 void (*close)(AVBitStreamFilterContext *bsfc);
3936 struct AVBitStreamFilter *next;
3937 } AVBitStreamFilter;
3939 void av_register_bitstream_filter(AVBitStreamFilter *bsf);
3940 AVBitStreamFilterContext *av_bitstream_filter_init(const char *name);
3941 int av_bitstream_filter_filter(AVBitStreamFilterContext *bsfc,
3942 AVCodecContext *avctx, const char *args,
3943 uint8_t **poutbuf, int *poutbuf_size,
3944 const uint8_t *buf, int buf_size, int keyframe);
3945 void av_bitstream_filter_close(AVBitStreamFilterContext *bsf);
3947 AVBitStreamFilter *av_bitstream_filter_next(AVBitStreamFilter *f);
3952 * Reallocate the given block if it is not large enough, otherwise do nothing.
3956 void *av_fast_realloc(void *ptr, unsigned int *size, unsigned int min_size);
3959 * Allocate a buffer, reusing the given one if large enough.
3961 * Contrary to av_fast_realloc the current buffer contents might not be
3962 * preserved and on error the old buffer is freed, thus no special
3963 * handling to avoid memleaks is necessary.
3965 * @param ptr pointer to pointer to already allocated buffer, overwritten with pointer to new buffer
3966 * @param size size of the buffer *ptr points to
3967 * @param min_size minimum size of *ptr buffer after returning, *ptr will be NULL and
3968 * *size 0 if an error occurred.
3970 void av_fast_malloc(void *ptr, unsigned int *size, unsigned int min_size);
3972 #if LIBAVCODEC_VERSION_MAJOR < 53
3974 * @deprecated Deprecated in favor of av_image_copy().
3976 attribute_deprecated
3977 void av_picture_data_copy(uint8_t *dst_data[4], int dst_linesize[4],
3978 uint8_t *src_data[4], int src_linesize[4],
3979 enum PixelFormat pix_fmt, int width, int height);
3983 * Copy image src to dst. Wraps av_picture_data_copy() above.
3985 void av_picture_copy(AVPicture *dst, const AVPicture *src,
3986 enum PixelFormat pix_fmt, int width, int height);
3989 * Crop image top and left side.
3991 int av_picture_crop(AVPicture *dst, const AVPicture *src,
3992 enum PixelFormat pix_fmt, int top_band, int left_band);
3997 int av_picture_pad(AVPicture *dst, const AVPicture *src, int height, int width, enum PixelFormat pix_fmt,
3998 int padtop, int padbottom, int padleft, int padright, int *color);
4001 * Encode extradata length to a buffer. Used by xiph codecs.
4003 * @param s buffer to write to; must be at least (v/255+1) bytes long
4004 * @param v size of extradata in bytes
4005 * @return number of bytes written to the buffer.
4007 unsigned int av_xiphlacing(unsigned char *s, unsigned int v);
4009 #if LIBAVCODEC_VERSION_MAJOR < 53
4011 * Parse str and put in width_ptr and height_ptr the detected values.
4013 * @deprecated Deprecated in favor of av_parse_video_size().
4015 attribute_deprecated int av_parse_video_frame_size(int *width_ptr, int *height_ptr, const char *str);
4018 * Parse str and store the detected values in *frame_rate.
4020 * @deprecated Deprecated in favor of av_parse_video_rate().
4022 attribute_deprecated int av_parse_video_frame_rate(AVRational *frame_rate, const char *str);
4026 * Logs a generic warning message about a missing feature. This function is
4027 * intended to be used internally by FFmpeg (libavcodec, libavformat, etc.)
4028 * only, and would normally not be used by applications.
4029 * @param[in] avc a pointer to an arbitrary struct of which the first field is
4030 * a pointer to an AVClass struct
4031 * @param[in] feature string containing the name of the missing feature
4032 * @param[in] want_sample indicates if samples are wanted which exhibit this feature.
4033 * If want_sample is non-zero, additional verbage will be added to the log
4034 * message which tells the user how to report samples to the development
4037 void av_log_missing_feature(void *avc, const char *feature, int want_sample);
4040 * Log a generic warning message asking for a sample. This function is
4041 * intended to be used internally by FFmpeg (libavcodec, libavformat, etc.)
4042 * only, and would normally not be used by applications.
4043 * @param[in] avc a pointer to an arbitrary struct of which the first field is
4044 * a pointer to an AVClass struct
4045 * @param[in] msg string containing an optional message, or NULL if no message
4047 void av_log_ask_for_sample(void *avc, const char *msg);
4050 * Register the hardware accelerator hwaccel.
4052 void av_register_hwaccel(AVHWAccel *hwaccel);
4055 * If hwaccel is NULL, returns the first registered hardware accelerator,
4056 * if hwaccel is non-NULL, returns the next registered hardware accelerator
4057 * after hwaccel, or NULL if hwaccel is the last one.
4059 AVHWAccel *av_hwaccel_next(AVHWAccel *hwaccel);
4063 * Lock operation used by lockmgr
4066 AV_LOCK_CREATE, ///< Create a mutex
4067 AV_LOCK_OBTAIN, ///< Lock the mutex
4068 AV_LOCK_RELEASE, ///< Unlock the mutex
4069 AV_LOCK_DESTROY, ///< Free mutex resources
4073 * Register a user provided lock manager supporting the operations
4074 * specified by AVLockOp. mutex points to a (void *) where the
4075 * lockmgr should store/get a pointer to a user allocated mutex. It's
4076 * NULL upon AV_LOCK_CREATE and != NULL for all other ops.
4078 * @param cb User defined callback. Note: FFmpeg may invoke calls to this
4079 * callback during the call to av_lockmgr_register().
4080 * Thus, the application must be prepared to handle that.
4081 * If cb is set to NULL the lockmgr will be unregistered.
4082 * Also note that during unregistration the previously registered
4083 * lockmgr callback may also be invoked.
4085 int av_lockmgr_register(int (*cb)(void **mutex, enum AVLockOp op));
4087 #endif /* AVCODEC_AVCODEC_H */