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 87
35 #define LIBAVCODEC_VERSION_MICRO 5
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)
58 #define AV_NOPTS_VALUE INT64_C(0x8000000000000000)
59 #define AV_TIME_BASE 1000000
60 #define AV_TIME_BASE_Q (AVRational){1, AV_TIME_BASE}
63 * Identify the syntax and semantics of the bitstream.
64 * The principle is roughly:
65 * Two decoders with the same ID can decode the same streams.
66 * Two encoders with the same ID can encode compatible streams.
67 * There may be slight deviations from the principle due to implementation
70 * If you add a codec ID to this list, add it so that
71 * 1. no value of a existing codec ID changes (that would break ABI),
72 * 2. it is as close as possible to similar codecs.
79 CODEC_ID_MPEG2VIDEO, ///< preferred ID for MPEG-1/2 video decoding
80 CODEC_ID_MPEG2VIDEO_XVMC,
117 CODEC_ID_INTERPLAY_VIDEO,
129 CODEC_ID_TRUEMOTION1,
140 #if LIBAVCODEC_VERSION_MAJOR < 53
159 CODEC_ID_TRUEMOTION2,
176 CODEC_ID_DSICINVIDEO,
177 CODEC_ID_TIERTEXSEQVIDEO,
186 CODEC_ID_BETHSOFTVID,
204 CODEC_ID_MOTIONPIXELS,
222 CODEC_ID_IFF_BYTERUN1,
231 /* various PCM "codecs" */
232 CODEC_ID_PCM_S16LE= 0x10000,
248 CODEC_ID_PCM_S24DAUD,
250 CODEC_ID_PCM_S16LE_PLANAR,
258 /* various ADPCM codecs */
259 CODEC_ID_ADPCM_IMA_QT= 0x11000,
260 CODEC_ID_ADPCM_IMA_WAV,
261 CODEC_ID_ADPCM_IMA_DK3,
262 CODEC_ID_ADPCM_IMA_DK4,
263 CODEC_ID_ADPCM_IMA_WS,
264 CODEC_ID_ADPCM_IMA_SMJPEG,
273 CODEC_ID_ADPCM_YAMAHA,
274 CODEC_ID_ADPCM_SBPRO_4,
275 CODEC_ID_ADPCM_SBPRO_3,
276 CODEC_ID_ADPCM_SBPRO_2,
278 CODEC_ID_ADPCM_IMA_AMV,
279 CODEC_ID_ADPCM_EA_R1,
280 CODEC_ID_ADPCM_EA_R3,
281 CODEC_ID_ADPCM_EA_R2,
282 CODEC_ID_ADPCM_IMA_EA_SEAD,
283 CODEC_ID_ADPCM_IMA_EA_EACS,
284 CODEC_ID_ADPCM_EA_XAS,
285 CODEC_ID_ADPCM_EA_MAXIS_XA,
286 CODEC_ID_ADPCM_IMA_ISS,
289 CODEC_ID_AMR_NB= 0x12000,
292 /* RealAudio codecs*/
293 CODEC_ID_RA_144= 0x13000,
296 /* various DPCM codecs */
297 CODEC_ID_ROQ_DPCM= 0x14000,
298 CODEC_ID_INTERPLAY_DPCM,
303 CODEC_ID_MP2= 0x15000,
304 CODEC_ID_MP3, ///< preferred ID for decoding MPEG audio layer 1, 2 or 3
322 CODEC_ID_WESTWOOD_SND1,
323 CODEC_ID_GSM, ///< as in Berlin toast format
331 CODEC_ID_DSICINAUDIO,
335 CODEC_ID_GSM_MS, /* as found in WAV */
344 CODEC_ID_WMALOSSLESS,
353 CODEC_ID_BINKAUDIO_RDFT,
354 CODEC_ID_BINKAUDIO_DCT,
356 /* subtitle codecs */
357 CODEC_ID_DVD_SUBTITLE= 0x17000,
358 CODEC_ID_DVB_SUBTITLE,
359 CODEC_ID_TEXT, ///< raw UTF-8 text
363 CODEC_ID_HDMV_PGS_SUBTITLE,
364 CODEC_ID_DVB_TELETEXT,
367 /* other specific kind of codecs (generally used for attachments) */
368 CODEC_ID_TTF= 0x18000,
370 CODEC_ID_PROBE= 0x19000, ///< codec_id is not known (like CODEC_ID_NONE) but lavf should attempt to identify it
372 CODEC_ID_MPEG2TS= 0x20000, /**< _FAKE_ codec to indicate a raw MPEG-2 TS
373 * stream (only used by libavformat) */
376 #if LIBAVCODEC_VERSION_MAJOR < 53
377 #define CodecType AVMediaType
379 #define CODEC_TYPE_UNKNOWN AVMEDIA_TYPE_UNKNOWN
380 #define CODEC_TYPE_VIDEO AVMEDIA_TYPE_VIDEO
381 #define CODEC_TYPE_AUDIO AVMEDIA_TYPE_AUDIO
382 #define CODEC_TYPE_DATA AVMEDIA_TYPE_DATA
383 #define CODEC_TYPE_SUBTITLE AVMEDIA_TYPE_SUBTITLE
384 #define CODEC_TYPE_ATTACHMENT AVMEDIA_TYPE_ATTACHMENT
385 #define CODEC_TYPE_NB AVMEDIA_TYPE_NB
389 * all in native-endian format
392 SAMPLE_FMT_NONE = -1,
393 SAMPLE_FMT_U8, ///< unsigned 8 bits
394 SAMPLE_FMT_S16, ///< signed 16 bits
395 SAMPLE_FMT_S32, ///< signed 32 bits
396 SAMPLE_FMT_FLT, ///< float
397 SAMPLE_FMT_DBL, ///< double
398 SAMPLE_FMT_NB ///< Number of sample formats. DO NOT USE if dynamically linking to libavcodec
401 /* Audio channel masks */
402 #define CH_FRONT_LEFT 0x00000001
403 #define CH_FRONT_RIGHT 0x00000002
404 #define CH_FRONT_CENTER 0x00000004
405 #define CH_LOW_FREQUENCY 0x00000008
406 #define CH_BACK_LEFT 0x00000010
407 #define CH_BACK_RIGHT 0x00000020
408 #define CH_FRONT_LEFT_OF_CENTER 0x00000040
409 #define CH_FRONT_RIGHT_OF_CENTER 0x00000080
410 #define CH_BACK_CENTER 0x00000100
411 #define CH_SIDE_LEFT 0x00000200
412 #define CH_SIDE_RIGHT 0x00000400
413 #define CH_TOP_CENTER 0x00000800
414 #define CH_TOP_FRONT_LEFT 0x00001000
415 #define CH_TOP_FRONT_CENTER 0x00002000
416 #define CH_TOP_FRONT_RIGHT 0x00004000
417 #define CH_TOP_BACK_LEFT 0x00008000
418 #define CH_TOP_BACK_CENTER 0x00010000
419 #define CH_TOP_BACK_RIGHT 0x00020000
420 #define CH_STEREO_LEFT 0x20000000 ///< Stereo downmix.
421 #define CH_STEREO_RIGHT 0x40000000 ///< See CH_STEREO_LEFT.
423 /** Channel mask value used for AVCodecContext.request_channel_layout
424 to indicate that the user requests the channel order of the decoder output
425 to be the native codec channel order. */
426 #define CH_LAYOUT_NATIVE 0x8000000000000000LL
428 /* Audio channel convenience macros */
429 #define CH_LAYOUT_MONO (CH_FRONT_CENTER)
430 #define CH_LAYOUT_STEREO (CH_FRONT_LEFT|CH_FRONT_RIGHT)
431 #define CH_LAYOUT_2_1 (CH_LAYOUT_STEREO|CH_BACK_CENTER)
432 #define CH_LAYOUT_SURROUND (CH_LAYOUT_STEREO|CH_FRONT_CENTER)
433 #define CH_LAYOUT_4POINT0 (CH_LAYOUT_SURROUND|CH_BACK_CENTER)
434 #define CH_LAYOUT_2_2 (CH_LAYOUT_STEREO|CH_SIDE_LEFT|CH_SIDE_RIGHT)
435 #define CH_LAYOUT_QUAD (CH_LAYOUT_STEREO|CH_BACK_LEFT|CH_BACK_RIGHT)
436 #define CH_LAYOUT_5POINT0 (CH_LAYOUT_SURROUND|CH_SIDE_LEFT|CH_SIDE_RIGHT)
437 #define CH_LAYOUT_5POINT1 (CH_LAYOUT_5POINT0|CH_LOW_FREQUENCY)
438 #define CH_LAYOUT_5POINT0_BACK (CH_LAYOUT_SURROUND|CH_BACK_LEFT|CH_BACK_RIGHT)
439 #define CH_LAYOUT_5POINT1_BACK (CH_LAYOUT_5POINT0_BACK|CH_LOW_FREQUENCY)
440 #define CH_LAYOUT_7POINT0 (CH_LAYOUT_5POINT0|CH_BACK_LEFT|CH_BACK_RIGHT)
441 #define CH_LAYOUT_7POINT1 (CH_LAYOUT_5POINT1|CH_BACK_LEFT|CH_BACK_RIGHT)
442 #define CH_LAYOUT_7POINT1_WIDE (CH_LAYOUT_5POINT1_BACK|\
443 CH_FRONT_LEFT_OF_CENTER|CH_FRONT_RIGHT_OF_CENTER)
444 #define CH_LAYOUT_STEREO_DOWNMIX (CH_STEREO_LEFT|CH_STEREO_RIGHT)
447 #define AVCODEC_MAX_AUDIO_FRAME_SIZE 192000 // 1 second of 48khz 32bit audio
450 * Required number of additionally allocated bytes at the end of the input bitstream for decoding.
451 * This is mainly needed because some optimized bitstream readers read
452 * 32 or 64 bit at once and could read over the end.<br>
453 * Note: If the first 23 bits of the additional bytes are not 0, then damaged
454 * MPEG bitstreams could cause overread and segfault.
456 #define FF_INPUT_BUFFER_PADDING_SIZE 8
459 * minimum encoding buffer size
460 * Used to avoid some checks during header writing.
462 #define FF_MIN_BUFFER_SIZE 16384
466 * motion estimation type.
469 ME_ZERO = 1, ///< no search, that is use 0,0 vector whenever one is needed
473 ME_EPZS, ///< enhanced predictive zonal search
474 ME_X1, ///< reserved for experiments
475 ME_HEX, ///< hexagon based search
476 ME_UMH, ///< uneven multi-hexagon search
477 ME_ITER, ///< iterative search
478 ME_TESA, ///< transformed exhaustive search algorithm
482 /* We leave some space between them for extensions (drop some
483 * keyframes for intra-only or drop just some bidir frames). */
484 AVDISCARD_NONE =-16, ///< discard nothing
485 AVDISCARD_DEFAULT= 0, ///< discard useless packets like 0 size packets in avi
486 AVDISCARD_NONREF = 8, ///< discard all non reference
487 AVDISCARD_BIDIR = 16, ///< discard all bidirectional frames
488 AVDISCARD_NONKEY = 32, ///< discard all frames except keyframes
489 AVDISCARD_ALL = 48, ///< discard all
492 enum AVColorPrimaries{
493 AVCOL_PRI_BT709 =1, ///< also ITU-R BT1361 / IEC 61966-2-4 / SMPTE RP177 Annex B
494 AVCOL_PRI_UNSPECIFIED=2,
496 AVCOL_PRI_BT470BG =5, ///< also ITU-R BT601-6 625 / ITU-R BT1358 625 / ITU-R BT1700 625 PAL & SECAM
497 AVCOL_PRI_SMPTE170M =6, ///< also ITU-R BT601-6 525 / ITU-R BT1358 525 / ITU-R BT1700 NTSC
498 AVCOL_PRI_SMPTE240M =7, ///< functionally identical to above
500 AVCOL_PRI_NB , ///< Not part of ABI
503 enum AVColorTransferCharacteristic{
504 AVCOL_TRC_BT709 =1, ///< also ITU-R BT1361
505 AVCOL_TRC_UNSPECIFIED=2,
506 AVCOL_TRC_GAMMA22 =4, ///< also ITU-R BT470M / ITU-R BT1700 625 PAL & SECAM
507 AVCOL_TRC_GAMMA28 =5, ///< also ITU-R BT470BG
508 AVCOL_TRC_NB , ///< Not part of ABI
513 AVCOL_SPC_BT709 =1, ///< also ITU-R BT1361 / IEC 61966-2-4 xvYCC709 / SMPTE RP177 Annex B
514 AVCOL_SPC_UNSPECIFIED=2,
516 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
517 AVCOL_SPC_SMPTE170M =6, ///< also ITU-R BT601-6 525 / ITU-R BT1358 525 / ITU-R BT1700 NTSC / functionally identical to above
518 AVCOL_SPC_SMPTE240M =7,
519 AVCOL_SPC_NB , ///< Not part of ABI
523 AVCOL_RANGE_UNSPECIFIED=0,
524 AVCOL_RANGE_MPEG =1, ///< the normal 219*2^(n-8) "MPEG" YUV ranges
525 AVCOL_RANGE_JPEG =2, ///< the normal 2^n-1 "JPEG" YUV ranges
526 AVCOL_RANGE_NB , ///< Not part of ABI
530 * X X 3 4 X X are luma samples,
531 * 1 2 1-6 are possible chroma positions
532 * X X 5 6 X 0 is undefined/unknown position
534 enum AVChromaLocation{
535 AVCHROMA_LOC_UNSPECIFIED=0,
536 AVCHROMA_LOC_LEFT =1, ///< mpeg2/4, h264 default
537 AVCHROMA_LOC_CENTER =2, ///< mpeg1, jpeg, h263
538 AVCHROMA_LOC_TOPLEFT =3, ///< DV
540 AVCHROMA_LOC_BOTTOMLEFT =5,
541 AVCHROMA_LOC_BOTTOM =6,
542 AVCHROMA_LOC_NB , ///< Not part of ABI
549 AV_LPC_TYPE_DEFAULT = -1, ///< use the codec default LPC type
550 AV_LPC_TYPE_NONE = 0, ///< do not use LPC prediction or use all zero coefficients
551 AV_LPC_TYPE_FIXED = 1, ///< fixed LPC coefficients
552 AV_LPC_TYPE_LEVINSON = 2, ///< Levinson-Durbin recursion
553 AV_LPC_TYPE_CHOLESKY = 3, ///< Cholesky factorization
554 AV_LPC_TYPE_NB , ///< Not part of ABI
557 typedef struct RcOverride{
560 int qscale; // If this is 0 then quality_factor will be used instead.
561 float quality_factor;
564 #define FF_MAX_B_FRAMES 16
567 These flags can be passed in AVCodecContext.flags before initialization.
568 Note: Not everything is supported yet.
571 #define CODEC_FLAG_QSCALE 0x0002 ///< Use fixed qscale.
572 #define CODEC_FLAG_4MV 0x0004 ///< 4 MV per MB allowed / advanced prediction for H.263.
573 #define CODEC_FLAG_QPEL 0x0010 ///< Use qpel MC.
574 #define CODEC_FLAG_GMC 0x0020 ///< Use GMC.
575 #define CODEC_FLAG_MV0 0x0040 ///< Always try a MB with MV=<0,0>.
576 #define CODEC_FLAG_PART 0x0080 ///< Use data partitioning.
578 * The parent program guarantees that the input for B-frames containing
579 * streams is not written to for at least s->max_b_frames+1 frames, if
580 * this is not set the input will be copied.
582 #define CODEC_FLAG_INPUT_PRESERVED 0x0100
583 #define CODEC_FLAG_PASS1 0x0200 ///< Use internal 2pass ratecontrol in first pass mode.
584 #define CODEC_FLAG_PASS2 0x0400 ///< Use internal 2pass ratecontrol in second pass mode.
585 #define CODEC_FLAG_EXTERN_HUFF 0x1000 ///< Use external Huffman table (for MJPEG).
586 #define CODEC_FLAG_GRAY 0x2000 ///< Only decode/encode grayscale.
587 #define CODEC_FLAG_EMU_EDGE 0x4000 ///< Don't draw edges.
588 #define CODEC_FLAG_PSNR 0x8000 ///< error[?] variables will be set during encoding.
589 #define CODEC_FLAG_TRUNCATED 0x00010000 /** Input bitstream might be truncated at a random
590 location instead of only at frame boundaries. */
591 #define CODEC_FLAG_NORMALIZE_AQP 0x00020000 ///< Normalize adaptive quantization.
592 #define CODEC_FLAG_INTERLACED_DCT 0x00040000 ///< Use interlaced DCT.
593 #define CODEC_FLAG_LOW_DELAY 0x00080000 ///< Force low delay.
594 #define CODEC_FLAG_ALT_SCAN 0x00100000 ///< Use alternate scan.
595 #define CODEC_FLAG_GLOBAL_HEADER 0x00400000 ///< Place global headers in extradata instead of every keyframe.
596 #define CODEC_FLAG_BITEXACT 0x00800000 ///< Use only bitexact stuff (except (I)DCT).
597 /* Fx : Flag for h263+ extra options */
598 #define CODEC_FLAG_AC_PRED 0x01000000 ///< H.263 advanced intra coding / MPEG-4 AC prediction
599 #define CODEC_FLAG_H263P_UMV 0x02000000 ///< unlimited motion vector
600 #define CODEC_FLAG_CBP_RD 0x04000000 ///< Use rate distortion optimization for cbp.
601 #define CODEC_FLAG_QP_RD 0x08000000 ///< Use rate distortion optimization for qp selectioon.
602 #define CODEC_FLAG_H263P_AIV 0x00000008 ///< H.263 alternative inter VLC
603 #define CODEC_FLAG_OBMC 0x00000001 ///< OBMC
604 #define CODEC_FLAG_LOOP_FILTER 0x00000800 ///< loop filter
605 #define CODEC_FLAG_H263P_SLICE_STRUCT 0x10000000
606 #define CODEC_FLAG_INTERLACED_ME 0x20000000 ///< interlaced motion estimation
607 #define CODEC_FLAG_SVCD_SCAN_OFFSET 0x40000000 ///< Will reserve space for SVCD scan offset user data.
608 #define CODEC_FLAG_CLOSED_GOP 0x80000000
609 #define CODEC_FLAG2_FAST 0x00000001 ///< Allow non spec compliant speedup tricks.
610 #define CODEC_FLAG2_STRICT_GOP 0x00000002 ///< Strictly enforce GOP size.
611 #define CODEC_FLAG2_NO_OUTPUT 0x00000004 ///< Skip bitstream encoding.
612 #define CODEC_FLAG2_LOCAL_HEADER 0x00000008 ///< Place global headers at every keyframe instead of in extradata.
613 #define CODEC_FLAG2_BPYRAMID 0x00000010 ///< H.264 allow B-frames to be used as references.
614 #define CODEC_FLAG2_WPRED 0x00000020 ///< H.264 weighted biprediction for B-frames
615 #define CODEC_FLAG2_MIXED_REFS 0x00000040 ///< H.264 one reference per partition, as opposed to one reference per macroblock
616 #define CODEC_FLAG2_8X8DCT 0x00000080 ///< H.264 high profile 8x8 transform
617 #define CODEC_FLAG2_FASTPSKIP 0x00000100 ///< H.264 fast pskip
618 #define CODEC_FLAG2_AUD 0x00000200 ///< H.264 access unit delimiters
619 #define CODEC_FLAG2_BRDO 0x00000400 ///< B-frame rate-distortion optimization
620 #define CODEC_FLAG2_INTRA_VLC 0x00000800 ///< Use MPEG-2 intra VLC table.
621 #define CODEC_FLAG2_MEMC_ONLY 0x00001000 ///< Only do ME/MC (I frames -> ref, P frame -> ME+MC).
622 #define CODEC_FLAG2_DROP_FRAME_TIMECODE 0x00002000 ///< timecode is in drop frame format.
623 #define CODEC_FLAG2_SKIP_RD 0x00004000 ///< RD optimal MB level residual skipping
624 #define CODEC_FLAG2_CHUNKS 0x00008000 ///< Input bitstream might be truncated at a packet boundaries instead of only at frame boundaries.
625 #define CODEC_FLAG2_NON_LINEAR_QUANT 0x00010000 ///< Use MPEG-2 nonlinear quantizer.
626 #define CODEC_FLAG2_BIT_RESERVOIR 0x00020000 ///< Use a bit reservoir when encoding if possible
627 #define CODEC_FLAG2_MBTREE 0x00040000 ///< Use macroblock tree ratecontrol (x264 only)
628 #define CODEC_FLAG2_PSY 0x00080000 ///< Use psycho visual optimizations.
629 #define CODEC_FLAG2_SSIM 0x00100000 ///< Compute SSIM during encoding, error[] values are undefined.
630 #define CODEC_FLAG2_INTRA_REFRESH 0x00200000 ///< Use periodic insertion of intra blocks instead of keyframes.
632 /* Unsupported options :
633 * Syntax Arithmetic coding (SAC)
634 * Reference Picture Selection
635 * Independent Segment Decoding */
637 /* codec capabilities */
639 #define CODEC_CAP_DRAW_HORIZ_BAND 0x0001 ///< Decoder can use draw_horiz_band callback.
641 * Codec uses get_buffer() for allocating buffers and supports custom allocators.
642 * If not set, it might not use get_buffer() at all or use operations that
643 * assume the buffer was allocated by avcodec_default_get_buffer.
645 #define CODEC_CAP_DR1 0x0002
646 /* If 'parse_only' field is true, then avcodec_parse_frame() can be used. */
647 #define CODEC_CAP_PARSE_ONLY 0x0004
648 #define CODEC_CAP_TRUNCATED 0x0008
649 /* Codec can export data for HW decoding (XvMC). */
650 #define CODEC_CAP_HWACCEL 0x0010
652 * Codec has a nonzero delay and needs to be fed with NULL at the end to get the delayed data.
653 * If this is not set, the codec is guaranteed to never be fed with NULL data.
655 #define CODEC_CAP_DELAY 0x0020
657 * Codec can be fed a final frame with a smaller size.
658 * This can be used to prevent truncation of the last audio samples.
660 #define CODEC_CAP_SMALL_LAST_FRAME 0x0040
662 * Codec can export data for HW decoding (VDPAU).
664 #define CODEC_CAP_HWACCEL_VDPAU 0x0080
666 * Codec can output multiple frames per AVPacket
667 * Normally demuxers return one frame at a time, demuxers which do not do
668 * are connected to a parser to split what they return into proper frames.
669 * This flag is reserved to the very rare category of codecs which have a
670 * bitstream that cannot be split into frames without timeconsuming
671 * operations like full decoding. Demuxers carring such bitstreams thus
672 * may return multiple frames in a packet. This has many disadvantages like
673 * prohibiting stream copy in many cases thus it should only be considered
676 #define CODEC_CAP_SUBFRAMES 0x0100
678 * Codec is experimental and is thus avoided in favor of non experimental
681 #define CODEC_CAP_EXPERIMENTAL 0x0200
683 //The following defines may change, don't expect compatibility if you use them.
684 #define MB_TYPE_INTRA4x4 0x0001
685 #define MB_TYPE_INTRA16x16 0x0002 //FIXME H.264-specific
686 #define MB_TYPE_INTRA_PCM 0x0004 //FIXME H.264-specific
687 #define MB_TYPE_16x16 0x0008
688 #define MB_TYPE_16x8 0x0010
689 #define MB_TYPE_8x16 0x0020
690 #define MB_TYPE_8x8 0x0040
691 #define MB_TYPE_INTERLACED 0x0080
692 #define MB_TYPE_DIRECT2 0x0100 //FIXME
693 #define MB_TYPE_ACPRED 0x0200
694 #define MB_TYPE_GMC 0x0400
695 #define MB_TYPE_SKIP 0x0800
696 #define MB_TYPE_P0L0 0x1000
697 #define MB_TYPE_P1L0 0x2000
698 #define MB_TYPE_P0L1 0x4000
699 #define MB_TYPE_P1L1 0x8000
700 #define MB_TYPE_L0 (MB_TYPE_P0L0 | MB_TYPE_P1L0)
701 #define MB_TYPE_L1 (MB_TYPE_P0L1 | MB_TYPE_P1L1)
702 #define MB_TYPE_L0L1 (MB_TYPE_L0 | MB_TYPE_L1)
703 #define MB_TYPE_QUANT 0x00010000
704 #define MB_TYPE_CBP 0x00020000
705 //Note bits 24-31 are reserved for codec specific use (h264 ref0, mpeg1 0mv, ...)
709 * This specifies the area which should be displayed.
710 * Note there may be multiple such areas for one frame.
712 typedef struct AVPanScan{
715 * - encoding: Set by user.
716 * - decoding: Set by libavcodec.
721 * width and height in 1/16 pel
722 * - encoding: Set by user.
723 * - decoding: Set by libavcodec.
729 * position of the top left corner in 1/16 pel for up to 3 fields/frames
730 * - encoding: Set by user.
731 * - decoding: Set by libavcodec.
733 int16_t position[3][2];
736 #define FF_COMMON_FRAME \
738 * pointer to the picture planes.\
739 * This might be different from the first allocated byte\
746 * pointer to the first allocated byte of the picture. Can be used in get_buffer/release_buffer.\
747 * This isn't used by libavcodec unless the default get/release_buffer() is used.\
753 * 1 -> keyframe, 0-> not\
754 * - encoding: Set by libavcodec.\
755 * - decoding: Set by libavcodec.\
760 * Picture type of the frame, see ?_TYPE below.\
761 * - encoding: Set by libavcodec. for coded_picture (and set by user for input).\
762 * - decoding: Set by libavcodec.\
767 * presentation timestamp in time_base units (time when frame should be shown to user)\
768 * If AV_NOPTS_VALUE then frame_rate = 1/time_base will be assumed.\
769 * - encoding: MUST be set by user.\
770 * - decoding: Set by libavcodec.\
775 * picture number in bitstream order\
776 * - encoding: set by\
777 * - decoding: Set by libavcodec.\
779 int coded_picture_number;\
781 * picture number in display order\
782 * - encoding: set by\
783 * - decoding: Set by libavcodec.\
785 int display_picture_number;\
788 * quality (between 1 (good) and FF_LAMBDA_MAX (bad)) \
789 * - encoding: Set by libavcodec. for coded_picture (and set by user for input).\
790 * - decoding: Set by libavcodec.\
795 * buffer age (1->was last buffer and dint change, 2->..., ...).\
796 * Set to INT_MAX if the buffer has not been used yet.\
797 * - encoding: unused\
798 * - decoding: MUST be set by get_buffer().\
803 * is this picture used as reference\
804 * The values for this are the same as the MpegEncContext.picture_structure\
805 * variable, that is 1->top field, 2->bottom field, 3->frame/both fields.\
806 * Set to 4 for delayed, non-reference frames.\
807 * - encoding: unused\
808 * - decoding: Set by libavcodec. (before get_buffer() call)).\
814 * - encoding: unused\
815 * - decoding: Set by libavcodec.\
817 int8_t *qscale_table;\
820 * - encoding: unused\
821 * - decoding: Set by libavcodec.\
826 * mbskip_table[mb]>=1 if MB didn't change\
827 * stride= mb_width = (width+15)>>4\
828 * - encoding: unused\
829 * - decoding: Set by libavcodec.\
831 uint8_t *mbskip_table;\
834 * motion vector table\
837 * int mv_sample_log2= 4 - motion_subsample_log2;\
838 * int mb_width= (width+15)>>4;\
839 * int mv_stride= (mb_width << mv_sample_log2) + 1;\
840 * motion_val[direction][x + y*mv_stride][0->mv_x, 1->mv_y];\
842 * - encoding: Set by user.\
843 * - decoding: Set by libavcodec.\
845 int16_t (*motion_val[2])[2];\
848 * macroblock type table\
849 * mb_type_base + mb_width + 2\
850 * - encoding: Set by user.\
851 * - decoding: Set by libavcodec.\
856 * log2 of the size of the block which a single vector in motion_val represents: \
857 * (4->16x16, 3->8x8, 2-> 4x4, 1-> 2x2)\
858 * - encoding: unused\
859 * - decoding: Set by libavcodec.\
861 uint8_t motion_subsample_log2;\
864 * for some private data of the user\
865 * - encoding: unused\
866 * - decoding: Set by user.\
872 * - encoding: Set by libavcodec. if flags&CODEC_FLAG_PSNR.\
873 * - decoding: unused\
878 * type of the buffer (to keep track of who has to deallocate data[*])\
879 * - encoding: Set by the one who allocates it.\
880 * - decoding: Set by the one who allocates it.\
881 * Note: User allocated (direct rendering) & internal buffers cannot coexist currently.\
886 * When decoding, this signals how much the picture must be delayed.\
887 * extra_delay = repeat_pict / (2*fps)\
888 * - encoding: unused\
889 * - decoding: Set by libavcodec.\
899 * The content of the picture is interlaced.\
900 * - encoding: Set by user.\
901 * - decoding: Set by libavcodec. (default 0)\
903 int interlaced_frame;\
906 * If the content is interlaced, is top field displayed first.\
907 * - encoding: Set by user.\
908 * - decoding: Set by libavcodec.\
910 int top_field_first;\
914 * - encoding: Set by user.\
915 * - decoding: Set by libavcodec.\
917 AVPanScan *pan_scan;\
920 * Tell user application that palette has changed from previous frame.\
921 * - encoding: ??? (no palette-enabled encoder yet)\
922 * - decoding: Set by libavcodec. (default 0).\
924 int palette_has_changed;\
927 * codec suggestion on buffer type if != 0\
928 * - encoding: unused\
929 * - decoding: Set by libavcodec. (before get_buffer() call)).\
935 * - encoding: unused\
936 * - decoding: Set by libavcodec.\
941 * motion reference frame index\
942 * the order in which these are stored can depend on the codec.\
943 * - encoding: Set by user.\
944 * - decoding: Set by libavcodec.\
946 int8_t *ref_index[2];\
949 * reordered opaque 64bit number (generally a PTS) from AVCodecContext.reordered_opaque\
950 * output in AVFrame.reordered_opaque\
951 * - encoding: unused\
952 * - decoding: Read by user.\
954 int64_t reordered_opaque;\
957 * hardware accelerator private data (FFmpeg allocated)\
958 * - encoding: unused\
959 * - decoding: Set by libavcodec\
961 void *hwaccel_picture_private;\
964 #define FF_QSCALE_TYPE_MPEG1 0
965 #define FF_QSCALE_TYPE_MPEG2 1
966 #define FF_QSCALE_TYPE_H264 2
967 #define FF_QSCALE_TYPE_VP56 3
969 #define FF_BUFFER_TYPE_INTERNAL 1
970 #define FF_BUFFER_TYPE_USER 2 ///< direct rendering buffers (image is (de)allocated by user)
971 #define FF_BUFFER_TYPE_SHARED 4 ///< Buffer from somewhere else; don't deallocate image (data/base), all other tables are not shared.
972 #define FF_BUFFER_TYPE_COPY 8 ///< Just a (modified) copy of some other buffer, don't deallocate anything.
975 #define FF_I_TYPE 1 ///< Intra
976 #define FF_P_TYPE 2 ///< Predicted
977 #define FF_B_TYPE 3 ///< Bi-dir predicted
978 #define FF_S_TYPE 4 ///< S(GMC)-VOP MPEG4
979 #define FF_SI_TYPE 5 ///< Switching Intra
980 #define FF_SP_TYPE 6 ///< Switching Predicted
983 #define FF_BUFFER_HINTS_VALID 0x01 // Buffer hints value is meaningful (if 0 ignore).
984 #define FF_BUFFER_HINTS_READABLE 0x02 // Codec will read from buffer.
985 #define FF_BUFFER_HINTS_PRESERVE 0x04 // User must not alter buffer content.
986 #define FF_BUFFER_HINTS_REUSABLE 0x08 // Codec will reuse the buffer (update).
988 typedef struct AVPacket {
990 * Presentation timestamp in AVStream->time_base units; the time at which
991 * the decompressed packet will be presented to the user.
992 * Can be AV_NOPTS_VALUE if it is not stored in the file.
993 * pts MUST be larger or equal to dts as presentation cannot happen before
994 * decompression, unless one wants to view hex dumps. Some formats misuse
995 * the terms dts and pts/cts to mean something different. Such timestamps
996 * must be converted to true pts/dts before they are stored in AVPacket.
1000 * Decompression timestamp in AVStream->time_base units; the time at which
1001 * the packet is decompressed.
1002 * Can be AV_NOPTS_VALUE if it is not stored in the file.
1010 * Duration of this packet in AVStream->time_base units, 0 if unknown.
1011 * Equals next_pts - this_pts in presentation order.
1014 void (*destruct)(struct AVPacket *);
1016 int64_t pos; ///< byte position in stream, -1 if unknown
1019 * Time difference in AVStream->time_base units from the pts of this
1020 * packet to the point at which the output from the decoder has converged
1021 * independent from the availability of previous frames. That is, the
1022 * frames are virtually identical no matter if decoding started from
1023 * the very first frame or from this keyframe.
1024 * Is AV_NOPTS_VALUE if unknown.
1025 * This field is not the display duration of the current packet.
1026 * This field has no meaning if the packet does not have AV_PKT_FLAG_KEY
1029 * The purpose of this field is to allow seeking in streams that have no
1030 * keyframes in the conventional sense. It corresponds to the
1031 * recovery point SEI in H.264 and match_time_delta in NUT. It is also
1032 * essential for some types of subtitle streams to ensure that all
1033 * subtitles are correctly displayed after seeking.
1035 int64_t convergence_duration;
1037 #define AV_PKT_FLAG_KEY 0x0001
1038 #if LIBAVCODEC_VERSION_MAJOR < 53
1039 #define PKT_FLAG_KEY AV_PKT_FLAG_KEY
1043 * Audio Video Frame.
1044 * New fields can be added to the end of FF_COMMON_FRAME with minor version
1046 * Removal, reordering and changes to existing fields require a major
1047 * version bump. No fields should be added into AVFrame before or after
1049 * sizeof(AVFrame) must not be used outside libav*.
1051 typedef struct AVFrame {
1056 * main external API structure.
1057 * New fields can be added to the end with minor version bumps.
1058 * Removal, reordering and changes to existing fields require a major
1060 * sizeof(AVCodecContext) must not be used outside libav*.
1062 typedef struct AVCodecContext {
1064 * information on struct for av_log
1065 * - set by avcodec_alloc_context
1067 const AVClass *av_class;
1069 * the average bitrate
1070 * - encoding: Set by user; unused for constant quantizer encoding.
1071 * - decoding: Set by libavcodec. 0 or some bitrate if this info is available in the stream.
1076 * number of bits the bitstream is allowed to diverge from the reference.
1077 * the reference can be CBR (for CBR pass1) or VBR (for pass2)
1078 * - encoding: Set by user; unused for constant quantizer encoding.
1079 * - decoding: unused
1081 int bit_rate_tolerance;
1085 * - encoding: Set by user.
1086 * - decoding: Set by user.
1091 * Some codecs need additional format info. It is stored here.
1092 * If any muxer uses this then ALL demuxers/parsers AND encoders for the
1093 * specific codec MUST set it correctly otherwise stream copy breaks.
1094 * In general use of this field by muxers is not recommanded.
1095 * - encoding: Set by libavcodec.
1096 * - decoding: Set by libavcodec. (FIXME: Is this OK?)
1101 * Motion estimation algorithm used for video coding.
1102 * 1 (zero), 2 (full), 3 (log), 4 (phods), 5 (epzs), 6 (x1), 7 (hex),
1103 * 8 (umh), 9 (iter), 10 (tesa) [7, 8, 10 are x264 specific, 9 is snow specific]
1104 * - encoding: MUST be set by user.
1105 * - decoding: unused
1110 * some codecs need / can use extradata like Huffman tables.
1111 * mjpeg: Huffman tables
1112 * rv10: additional flags
1113 * mpeg4: global headers (they can be in the bitstream or here)
1114 * The allocated memory should be FF_INPUT_BUFFER_PADDING_SIZE bytes larger
1115 * than extradata_size to avoid prolems if it is read with the bitstream reader.
1116 * The bytewise contents of extradata must not depend on the architecture or CPU endianness.
1117 * - encoding: Set/allocated/freed by libavcodec.
1118 * - decoding: Set/allocated/freed by user.
1124 * This is the fundamental unit of time (in seconds) in terms
1125 * of which frame timestamps are represented. For fixed-fps content,
1126 * timebase should be 1/framerate and timestamp increments should be
1128 * - encoding: MUST be set by user.
1129 * - decoding: Set by libavcodec.
1131 AVRational time_base;
1135 * picture width / height.
1136 * - encoding: MUST be set by user.
1137 * - decoding: Set by libavcodec.
1138 * Note: For compatibility it is possible to set this instead of
1139 * coded_width/height before decoding.
1143 #define FF_ASPECT_EXTENDED 15
1146 * the number of pictures in a group of pictures, or 0 for intra_only
1147 * - encoding: Set by user.
1148 * - decoding: unused
1153 * Pixel format, see PIX_FMT_xxx.
1154 * May be set by the demuxer if known from headers.
1155 * May be overriden by the decoder if it knows better.
1156 * - encoding: Set by user.
1157 * - decoding: Set by user if known, overridden by libavcodec if known
1159 enum PixelFormat pix_fmt;
1162 * Frame rate emulation. If not zero, the lower layer (i.e. format handler)
1163 * has to read frames at native frame rate.
1164 * - encoding: Set by user.
1165 * - decoding: unused
1170 * If non NULL, 'draw_horiz_band' is called by the libavcodec
1171 * decoder to draw a horizontal band. It improves cache usage. Not
1172 * all codecs can do that. You must check the codec capabilities
1174 * The function is also used by hardware acceleration APIs.
1175 * It is called at least once during frame decoding to pass
1176 * the data needed for hardware render.
1177 * In that mode instead of pixel data, AVFrame points to
1178 * a structure specific to the acceleration API. The application
1179 * reads the structure and can change some fields to indicate progress
1181 * - encoding: unused
1182 * - decoding: Set by user.
1183 * @param height the height of the slice
1184 * @param y the y position of the slice
1185 * @param type 1->top field, 2->bottom field, 3->frame
1186 * @param offset offset into the AVFrame.data from which the slice should be read
1188 void (*draw_horiz_band)(struct AVCodecContext *s,
1189 const AVFrame *src, int offset[4],
1190 int y, int type, int height);
1193 int sample_rate; ///< samples per second
1194 int channels; ///< number of audio channels
1197 * audio sample format
1198 * - encoding: Set by user.
1199 * - decoding: Set by libavcodec.
1201 enum SampleFormat sample_fmt; ///< sample format
1203 /* The following data should not be initialized. */
1205 * Samples per packet, initialized when calling 'init'.
1208 int frame_number; ///< audio or video frame number
1209 #if LIBAVCODEC_VERSION_MAJOR < 53
1210 int real_pict_num; ///< Returns the real picture number of previous encoded frame.
1214 * Number of frames the decoded output will be delayed relative to
1215 * the encoded input.
1216 * - encoding: Set by libavcodec.
1217 * - decoding: unused
1221 /* - encoding parameters */
1222 float qcompress; ///< amount of qscale change between easy & hard scenes (0.0-1.0)
1223 float qblur; ///< amount of qscale smoothing over time (0.0-1.0)
1227 * - encoding: Set by user.
1228 * - decoding: unused
1234 * - encoding: Set by user.
1235 * - decoding: unused
1240 * maximum quantizer difference between frames
1241 * - encoding: Set by user.
1242 * - decoding: unused
1247 * maximum number of B-frames between non-B-frames
1248 * Note: The output will be delayed by max_b_frames+1 relative to the input.
1249 * - encoding: Set by user.
1250 * - decoding: unused
1255 * qscale factor between IP and B-frames
1256 * If > 0 then the last P-frame quantizer will be used (q= lastp_q*factor+offset).
1257 * If < 0 then normal ratecontrol will be done (q= -normal_q*factor+offset).
1258 * - encoding: Set by user.
1259 * - decoding: unused
1261 float b_quant_factor;
1263 /** obsolete FIXME remove */
1265 #define FF_RC_STRATEGY_XVID 1
1267 int b_frame_strategy;
1271 * - encoding: unused
1272 * - decoding: Set by user. 1-> Skip B-frames, 2-> Skip IDCT/dequant too, 5-> Skip everything except header
1273 * @deprecated Deprecated in favor of skip_idct and skip_frame.
1277 struct AVCodec *codec;
1281 int rtp_payload_size; /* The size of the RTP payload: the coder will */
1282 /* do its best to deliver a chunk with size */
1283 /* below rtp_payload_size, the chunk will start */
1284 /* with a start code on some codecs like H.263. */
1285 /* This doesn't take account of any particular */
1286 /* headers inside the transmitted RTP payload. */
1289 /* The RTP callback: This function is called */
1290 /* every time the encoder has a packet to send. */
1291 /* It depends on the encoder if the data starts */
1292 /* with a Start Code (it should). H.263 does. */
1293 /* mb_nb contains the number of macroblocks */
1294 /* encoded in the RTP payload. */
1295 void (*rtp_callback)(struct AVCodecContext *avctx, void *data, int size, int mb_nb);
1297 /* statistics, used for 2-pass encoding */
1308 * number of bits used for the previously encoded frame
1309 * - encoding: Set by libavcodec.
1310 * - decoding: unused
1315 * Private data of the user, can be used to carry app specific stuff.
1316 * - encoding: Set by user.
1317 * - decoding: Set by user.
1321 char codec_name[32];
1322 enum AVMediaType codec_type; /* see AVMEDIA_TYPE_xxx */
1323 enum CodecID codec_id; /* see CODEC_ID_xxx */
1326 * fourcc (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A').
1327 * This is used to work around some encoder bugs.
1328 * A demuxer should set this to what is stored in the field used to identify the codec.
1329 * If there are multiple such fields in a container then the demuxer should choose the one
1330 * which maximizes the information about the used codec.
1331 * If the codec tag field in a container is larger then 32 bits then the demuxer should
1332 * remap the longer ID to 32 bits with a table or other structure. Alternatively a new
1333 * extra_codec_tag + size could be added but for this a clear advantage must be demonstrated
1335 * - encoding: Set by user, if not then the default based on codec_id will be used.
1336 * - decoding: Set by user, will be converted to uppercase by libavcodec during init.
1338 unsigned int codec_tag;
1341 * Work around bugs in encoders which sometimes cannot be detected automatically.
1342 * - encoding: Set by user
1343 * - decoding: Set by user
1345 int workaround_bugs;
1346 #define FF_BUG_AUTODETECT 1 ///< autodetection
1347 #define FF_BUG_OLD_MSMPEG4 2
1348 #define FF_BUG_XVID_ILACE 4
1349 #define FF_BUG_UMP4 8
1350 #define FF_BUG_NO_PADDING 16
1351 #define FF_BUG_AMV 32
1352 #define FF_BUG_AC_VLC 0 ///< Will be removed, libavcodec can now handle these non-compliant files by default.
1353 #define FF_BUG_QPEL_CHROMA 64
1354 #define FF_BUG_STD_QPEL 128
1355 #define FF_BUG_QPEL_CHROMA2 256
1356 #define FF_BUG_DIRECT_BLOCKSIZE 512
1357 #define FF_BUG_EDGE 1024
1358 #define FF_BUG_HPEL_CHROMA 2048
1359 #define FF_BUG_DC_CLIP 4096
1360 #define FF_BUG_MS 8192 ///< Work around various bugs in Microsoft's broken decoders.
1361 #define FF_BUG_TRUNCATED 16384
1362 //#define FF_BUG_FAKE_SCALABILITY 16 //Autodetection should work 100%.
1365 * luma single coefficient elimination threshold
1366 * - encoding: Set by user.
1367 * - decoding: unused
1369 int luma_elim_threshold;
1372 * chroma single coeff elimination threshold
1373 * - encoding: Set by user.
1374 * - decoding: unused
1376 int chroma_elim_threshold;
1379 * strictly follow the standard (MPEG4, ...).
1380 * - encoding: Set by user.
1381 * - decoding: Set by user.
1382 * Setting this to STRICT or higher means the encoder and decoder will
1383 * generally do stupid things, whereas setting it to unofficial or lower
1384 * will mean the encoder might produce output that is not supported by all
1385 * spec-compliant decoders. Decoders don't differentiate between normal,
1386 * unofficial and experimental (that is, they always try to decode things
1387 * when they can) unless they are explicitly asked to behave stupidly
1388 * (=strictly conform to the specs)
1390 int strict_std_compliance;
1391 #define FF_COMPLIANCE_VERY_STRICT 2 ///< Strictly conform to an older more strict version of the spec or reference software.
1392 #define FF_COMPLIANCE_STRICT 1 ///< Strictly conform to all the things in the spec no matter what consequences.
1393 #define FF_COMPLIANCE_NORMAL 0
1394 #if LIBAVCODEC_VERSION_MAJOR < 53
1395 #define FF_COMPLIANCE_INOFFICIAL -1 ///< Allow inofficial extensions (deprecated - use FF_COMPLIANCE_UNOFFICIAL instead).
1397 #define FF_COMPLIANCE_UNOFFICIAL -1 ///< Allow unofficial extensions
1398 #define FF_COMPLIANCE_EXPERIMENTAL -2 ///< Allow nonstandardized experimental things.
1401 * qscale offset between IP and B-frames
1402 * - encoding: Set by user.
1403 * - decoding: unused
1405 float b_quant_offset;
1408 * Error recognization; higher values will detect more errors but may
1409 * misdetect some more or less valid parts as errors.
1410 * - encoding: unused
1411 * - decoding: Set by user.
1413 int error_recognition;
1414 #define FF_ER_CAREFUL 1
1415 #define FF_ER_COMPLIANT 2
1416 #define FF_ER_AGGRESSIVE 3
1417 #define FF_ER_VERY_AGGRESSIVE 4
1420 * Called at the beginning of each frame to get a buffer for it.
1421 * If pic.reference is set then the frame will be read later by libavcodec.
1422 * avcodec_align_dimensions2() should be used to find the required width and
1423 * height, as they normally need to be rounded up to the next multiple of 16.
1424 * if CODEC_CAP_DR1 is not set then get_buffer() must call
1425 * avcodec_default_get_buffer() instead of providing buffers allocated by
1427 * - encoding: unused
1428 * - decoding: Set by libavcodec, user can override.
1430 int (*get_buffer)(struct AVCodecContext *c, AVFrame *pic);
1433 * Called to release buffers which were allocated with get_buffer.
1434 * A released buffer can be reused in get_buffer().
1435 * pic.data[*] must be set to NULL.
1436 * - encoding: unused
1437 * - decoding: Set by libavcodec, user can override.
1439 void (*release_buffer)(struct AVCodecContext *c, AVFrame *pic);
1442 * Size of the frame reordering buffer in the decoder.
1443 * For MPEG-2 it is 1 IPB or 0 low delay IP.
1444 * - encoding: Set by libavcodec.
1445 * - decoding: Set by libavcodec.
1450 * number of bytes per packet if constant and known or 0
1451 * Used by some WAV based audio codecs.
1455 int parse_only; /* - decoding only: If true, only parsing is done
1456 (function avcodec_parse_frame()). The frame
1457 data is returned. Only MPEG codecs support this now. */
1460 * 0-> h263 quant 1-> mpeg quant
1461 * - encoding: Set by user.
1462 * - decoding: unused
1467 * pass1 encoding statistics output buffer
1468 * - encoding: Set by libavcodec.
1469 * - decoding: unused
1474 * pass2 encoding statistics input buffer
1475 * Concatenated stuff from stats_out of pass1 should be placed here.
1476 * - encoding: Allocated/set/freed by user.
1477 * - decoding: unused
1482 * ratecontrol qmin qmax limiting method
1483 * 0-> clipping, 1-> use a nice continous function to limit qscale wthin qmin/qmax.
1484 * - encoding: Set by user.
1485 * - decoding: unused
1493 * ratecontrol override, see RcOverride
1494 * - encoding: Allocated/set/freed by user.
1495 * - decoding: unused
1497 RcOverride *rc_override;
1498 int rc_override_count;
1501 * rate control equation
1502 * - encoding: Set by user
1503 * - decoding: unused
1509 * - encoding: Set by user.
1510 * - decoding: unused
1516 * - encoding: Set by user.
1517 * - decoding: unused
1522 * decoder bitstream buffer size
1523 * - encoding: Set by user.
1524 * - decoding: unused
1527 float rc_buffer_aggressivity;
1530 * qscale factor between P and I-frames
1531 * If > 0 then the last p frame quantizer will be used (q= lastp_q*factor+offset).
1532 * If < 0 then normal ratecontrol will be done (q= -normal_q*factor+offset).
1533 * - encoding: Set by user.
1534 * - decoding: unused
1536 float i_quant_factor;
1539 * qscale offset between P and I-frames
1540 * - encoding: Set by user.
1541 * - decoding: unused
1543 float i_quant_offset;
1546 * initial complexity for pass1 ratecontrol
1547 * - encoding: Set by user.
1548 * - decoding: unused
1550 float rc_initial_cplx;
1553 * DCT algorithm, see FF_DCT_* below
1554 * - encoding: Set by user.
1555 * - decoding: unused
1558 #define FF_DCT_AUTO 0
1559 #define FF_DCT_FASTINT 1
1560 #define FF_DCT_INT 2
1561 #define FF_DCT_MMX 3
1562 #define FF_DCT_MLIB 4
1563 #define FF_DCT_ALTIVEC 5
1564 #define FF_DCT_FAAN 6
1567 * luminance masking (0-> disabled)
1568 * - encoding: Set by user.
1569 * - decoding: unused
1574 * temporary complexity masking (0-> disabled)
1575 * - encoding: Set by user.
1576 * - decoding: unused
1578 float temporal_cplx_masking;
1581 * spatial complexity masking (0-> disabled)
1582 * - encoding: Set by user.
1583 * - decoding: unused
1585 float spatial_cplx_masking;
1588 * p block masking (0-> disabled)
1589 * - encoding: Set by user.
1590 * - decoding: unused
1595 * darkness masking (0-> disabled)
1596 * - encoding: Set by user.
1597 * - decoding: unused
1602 * IDCT algorithm, see FF_IDCT_* below.
1603 * - encoding: Set by user.
1604 * - decoding: Set by user.
1607 #define FF_IDCT_AUTO 0
1608 #define FF_IDCT_INT 1
1609 #define FF_IDCT_SIMPLE 2
1610 #define FF_IDCT_SIMPLEMMX 3
1611 #define FF_IDCT_LIBMPEG2MMX 4
1612 #define FF_IDCT_PS2 5
1613 #define FF_IDCT_MLIB 6
1614 #define FF_IDCT_ARM 7
1615 #define FF_IDCT_ALTIVEC 8
1616 #define FF_IDCT_SH4 9
1617 #define FF_IDCT_SIMPLEARM 10
1618 #define FF_IDCT_H264 11
1619 #define FF_IDCT_VP3 12
1620 #define FF_IDCT_IPP 13
1621 #define FF_IDCT_XVIDMMX 14
1622 #define FF_IDCT_CAVS 15
1623 #define FF_IDCT_SIMPLEARMV5TE 16
1624 #define FF_IDCT_SIMPLEARMV6 17
1625 #define FF_IDCT_SIMPLEVIS 18
1626 #define FF_IDCT_WMV2 19
1627 #define FF_IDCT_FAAN 20
1628 #define FF_IDCT_EA 21
1629 #define FF_IDCT_SIMPLENEON 22
1630 #define FF_IDCT_SIMPLEALPHA 23
1631 #define FF_IDCT_BINK 24
1635 * - encoding: Set by libavcodec.
1636 * - decoding: Set by user (or 0).
1640 * slice offsets in the frame in bytes
1641 * - encoding: Set/allocated by libavcodec.
1642 * - decoding: Set/allocated by user (or NULL).
1647 * error concealment flags
1648 * - encoding: unused
1649 * - decoding: Set by user.
1651 int error_concealment;
1652 #define FF_EC_GUESS_MVS 1
1653 #define FF_EC_DEBLOCK 2
1656 * dsp_mask could be add used to disable unwanted CPU features
1657 * CPU features (i.e. MMX, SSE. ...)
1659 * With the FORCE flag you may instead enable given CPU features.
1660 * (Dangerous: Usable in case of misdetection, improper usage however will
1661 * result into program crash.)
1666 #define FF_MM_FORCE AV_CPU_FLAG_FORCE
1667 #define FF_MM_MMX AV_CPU_FLAG_MMX
1668 #define FF_MM_3DNOW AV_CPU_FLAG_3DNOW
1669 #define FF_MM_MMXEXT AV_CPU_FLAG_MMX2
1670 #define FF_MM_MMX2 AV_CPU_FLAG_MMX2
1671 #define FF_MM_SSE AV_CPU_FLAG_SSE
1672 #define FF_MM_SSE2 AV_CPU_FLAG_SSE2
1673 #define FF_MM_SSE2SLOW AV_CPU_FLAG_SSE2SLOW
1674 #define FF_MM_3DNOWEXT AV_CPU_FLAG_3DNOWEXT
1675 #define FF_MM_SSE3 AV_CPU_FLAG_SSE3
1676 #define FF_MM_SSE3SLOW AV_CPU_FLAG_SSE3SLOW
1677 #define FF_MM_SSSE3 AV_CPU_FLAG_SSSE3
1678 #define FF_MM_SSE4 AV_CPU_FLAG_SSE4
1679 #define FF_MM_SSE42 AV_CPU_FLAG_SSE42
1680 #define FF_MM_IWMMXT AV_CPU_FLAG_IWMMXT
1681 #define FF_MM_ALTIVEC AV_CPU_FLAG_ALTIVEC
1685 * bits per sample/pixel from the demuxer (needed for huffyuv).
1686 * - encoding: Set by libavcodec.
1687 * - decoding: Set by user.
1689 int bits_per_coded_sample;
1692 * prediction method (needed for huffyuv)
1693 * - encoding: Set by user.
1694 * - decoding: unused
1696 int prediction_method;
1697 #define FF_PRED_LEFT 0
1698 #define FF_PRED_PLANE 1
1699 #define FF_PRED_MEDIAN 2
1702 * sample aspect ratio (0 if unknown)
1703 * That is the width of a pixel divided by the height of the pixel.
1704 * Numerator and denominator must be relatively prime and smaller than 256 for some video standards.
1705 * - encoding: Set by user.
1706 * - decoding: Set by libavcodec.
1708 AVRational sample_aspect_ratio;
1711 * the picture in the bitstream
1712 * - encoding: Set by libavcodec.
1713 * - decoding: Set by libavcodec.
1715 AVFrame *coded_frame;
1719 * - encoding: Set by user.
1720 * - decoding: Set by user.
1723 #define FF_DEBUG_PICT_INFO 1
1724 #define FF_DEBUG_RC 2
1725 #define FF_DEBUG_BITSTREAM 4
1726 #define FF_DEBUG_MB_TYPE 8
1727 #define FF_DEBUG_QP 16
1728 #define FF_DEBUG_MV 32
1729 #define FF_DEBUG_DCT_COEFF 0x00000040
1730 #define FF_DEBUG_SKIP 0x00000080
1731 #define FF_DEBUG_STARTCODE 0x00000100
1732 #define FF_DEBUG_PTS 0x00000200
1733 #define FF_DEBUG_ER 0x00000400
1734 #define FF_DEBUG_MMCO 0x00000800
1735 #define FF_DEBUG_BUGS 0x00001000
1736 #define FF_DEBUG_VIS_QP 0x00002000
1737 #define FF_DEBUG_VIS_MB_TYPE 0x00004000
1738 #define FF_DEBUG_BUFFERS 0x00008000
1742 * - encoding: Set by user.
1743 * - decoding: Set by user.
1746 #define FF_DEBUG_VIS_MV_P_FOR 0x00000001 //visualize forward predicted MVs of P frames
1747 #define FF_DEBUG_VIS_MV_B_FOR 0x00000002 //visualize forward predicted MVs of B frames
1748 #define FF_DEBUG_VIS_MV_B_BACK 0x00000004 //visualize backward predicted MVs of B frames
1752 * - encoding: Set by libavcodec if flags&CODEC_FLAG_PSNR.
1753 * - decoding: unused
1758 * minimum MB quantizer
1759 * - encoding: unused
1760 * - decoding: unused
1765 * maximum MB quantizer
1766 * - encoding: unused
1767 * - decoding: unused
1772 * motion estimation comparison function
1773 * - encoding: Set by user.
1774 * - decoding: unused
1778 * subpixel motion estimation comparison function
1779 * - encoding: Set by user.
1780 * - decoding: unused
1784 * macroblock comparison function (not supported yet)
1785 * - encoding: Set by user.
1786 * - decoding: unused
1790 * interlaced DCT comparison function
1791 * - encoding: Set by user.
1792 * - decoding: unused
1795 #define FF_CMP_SAD 0
1796 #define FF_CMP_SSE 1
1797 #define FF_CMP_SATD 2
1798 #define FF_CMP_DCT 3
1799 #define FF_CMP_PSNR 4
1800 #define FF_CMP_BIT 5
1802 #define FF_CMP_ZERO 7
1803 #define FF_CMP_VSAD 8
1804 #define FF_CMP_VSSE 9
1805 #define FF_CMP_NSSE 10
1806 #define FF_CMP_W53 11
1807 #define FF_CMP_W97 12
1808 #define FF_CMP_DCTMAX 13
1809 #define FF_CMP_DCT264 14
1810 #define FF_CMP_CHROMA 256
1813 * ME diamond size & shape
1814 * - encoding: Set by user.
1815 * - decoding: unused
1820 * amount of previous MV predictors (2a+1 x 2a+1 square)
1821 * - encoding: Set by user.
1822 * - decoding: unused
1824 int last_predictor_count;
1827 * prepass for motion estimation
1828 * - encoding: Set by user.
1829 * - decoding: unused
1834 * motion estimation prepass comparison function
1835 * - encoding: Set by user.
1836 * - decoding: unused
1841 * ME prepass diamond size & shape
1842 * - encoding: Set by user.
1843 * - decoding: unused
1849 * - encoding: Set by user.
1850 * - decoding: unused
1852 int me_subpel_quality;
1855 * callback to negotiate the pixelFormat
1856 * @param fmt is the list of formats which are supported by the codec,
1857 * it is terminated by -1 as 0 is a valid format, the formats are ordered by quality.
1858 * The first is always the native one.
1859 * @return the chosen format
1860 * - encoding: unused
1861 * - decoding: Set by user, if not set the native format will be chosen.
1863 enum PixelFormat (*get_format)(struct AVCodecContext *s, const enum PixelFormat * fmt);
1866 * DTG active format information (additional aspect ratio
1867 * information only used in DVB MPEG-2 transport streams)
1870 * - encoding: unused
1871 * - decoding: Set by decoder.
1873 int dtg_active_format;
1874 #define FF_DTG_AFD_SAME 8
1875 #define FF_DTG_AFD_4_3 9
1876 #define FF_DTG_AFD_16_9 10
1877 #define FF_DTG_AFD_14_9 11
1878 #define FF_DTG_AFD_4_3_SP_14_9 13
1879 #define FF_DTG_AFD_16_9_SP_14_9 14
1880 #define FF_DTG_AFD_SP_4_3 15
1883 * maximum motion estimation search range in subpel units
1884 * If 0 then no limit.
1886 * - encoding: Set by user.
1887 * - decoding: unused
1892 * intra quantizer bias
1893 * - encoding: Set by user.
1894 * - decoding: unused
1896 int intra_quant_bias;
1897 #define FF_DEFAULT_QUANT_BIAS 999999
1900 * inter quantizer bias
1901 * - encoding: Set by user.
1902 * - decoding: unused
1904 int inter_quant_bias;
1908 * - encoding: unused
1909 * - decoding: Which clrtable should be used for 8bit RGB images.
1910 * Tables have to be stored somewhere. FIXME
1915 * internal_buffer count
1916 * Don't touch, used by libavcodec default_get_buffer().
1918 int internal_buffer_count;
1922 * Don't touch, used by libavcodec default_get_buffer().
1924 void *internal_buffer;
1926 #define FF_LAMBDA_SHIFT 7
1927 #define FF_LAMBDA_SCALE (1<<FF_LAMBDA_SHIFT)
1928 #define FF_QP2LAMBDA 118 ///< factor to convert from H.263 QP to lambda
1929 #define FF_LAMBDA_MAX (256*128-1)
1931 #define FF_QUALITY_SCALE FF_LAMBDA_SCALE //FIXME maybe remove
1933 * Global quality for codecs which cannot change it per frame.
1934 * This should be proportional to MPEG-1/2/4 qscale.
1935 * - encoding: Set by user.
1936 * - decoding: unused
1940 #define FF_CODER_TYPE_VLC 0
1941 #define FF_CODER_TYPE_AC 1
1942 #define FF_CODER_TYPE_RAW 2
1943 #define FF_CODER_TYPE_RLE 3
1944 #define FF_CODER_TYPE_DEFLATE 4
1947 * - encoding: Set by user.
1948 * - decoding: unused
1954 * - encoding: Set by user.
1955 * - decoding: unused
1961 * - encoding: unused
1962 * - decoding: Set by user.
1964 uint8_t * (*realloc)(struct AVCodecContext *s, uint8_t *buf, int buf_size);
1969 * - encoding: unused
1970 * - decoding: Set by user.
1973 #define SLICE_FLAG_CODED_ORDER 0x0001 ///< draw_horiz_band() is called in coded order instead of display
1974 #define SLICE_FLAG_ALLOW_FIELD 0x0002 ///< allow draw_horiz_band() with field slices (MPEG2 field pics)
1975 #define SLICE_FLAG_ALLOW_PLANE 0x0004 ///< allow draw_horiz_band() with 1 component at a time (SVQ1)
1978 * XVideo Motion Acceleration
1979 * - encoding: forbidden
1980 * - decoding: set by decoder
1982 int xvmc_acceleration;
1985 * macroblock decision mode
1986 * - encoding: Set by user.
1987 * - decoding: unused
1990 #define FF_MB_DECISION_SIMPLE 0 ///< uses mb_cmp
1991 #define FF_MB_DECISION_BITS 1 ///< chooses the one which needs the fewest bits
1992 #define FF_MB_DECISION_RD 2 ///< rate distortion
1995 * custom intra quantization matrix
1996 * - encoding: Set by user, can be NULL.
1997 * - decoding: Set by libavcodec.
1999 uint16_t *intra_matrix;
2002 * custom inter quantization matrix
2003 * - encoding: Set by user, can be NULL.
2004 * - decoding: Set by libavcodec.
2006 uint16_t *inter_matrix;
2009 * fourcc from the AVI stream header (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A').
2010 * This is used to work around some encoder bugs.
2011 * - encoding: unused
2012 * - decoding: Set by user, will be converted to uppercase by libavcodec during init.
2014 unsigned int stream_codec_tag;
2017 * scene change detection threshold
2018 * 0 is default, larger means fewer detected scene changes.
2019 * - encoding: Set by user.
2020 * - decoding: unused
2022 int scenechange_threshold;
2025 * minimum Lagrange multipler
2026 * - encoding: Set by user.
2027 * - decoding: unused
2032 * maximum Lagrange multipler
2033 * - encoding: Set by user.
2034 * - decoding: unused
2038 #if FF_API_PALETTE_CONTROL
2040 * palette control structure
2041 * - encoding: ??? (no palette-enabled encoder yet)
2042 * - decoding: Set by user.
2044 struct AVPaletteControl *palctrl;
2048 * noise reduction strength
2049 * - encoding: Set by user.
2050 * - decoding: unused
2052 int noise_reduction;
2055 * Called at the beginning of a frame to get cr buffer for it.
2056 * Buffer type (size, hints) must be the same. libavcodec won't check it.
2057 * libavcodec will pass previous buffer in pic, function should return
2058 * same buffer or new buffer with old frame "painted" into it.
2059 * If pic.data[0] == NULL must behave like get_buffer().
2060 * if CODEC_CAP_DR1 is not set then reget_buffer() must call
2061 * avcodec_default_reget_buffer() instead of providing buffers allocated by
2063 * - encoding: unused
2064 * - decoding: Set by libavcodec, user can override.
2066 int (*reget_buffer)(struct AVCodecContext *c, AVFrame *pic);
2069 * Number of bits which should be loaded into the rc buffer before decoding starts.
2070 * - encoding: Set by user.
2071 * - decoding: unused
2073 int rc_initial_buffer_occupancy;
2077 * - encoding: Set by user.
2078 * - decoding: unused
2080 int inter_threshold;
2084 * - encoding: Set by user.
2085 * - decoding: Set by user.
2090 * Simulates errors in the bitstream to test error concealment.
2091 * - encoding: Set by user.
2092 * - decoding: unused
2097 * MP3 antialias algorithm, see FF_AA_* below.
2098 * - encoding: unused
2099 * - decoding: Set by user.
2102 #define FF_AA_AUTO 0
2103 #define FF_AA_FASTINT 1 //not implemented yet
2105 #define FF_AA_FLOAT 3
2107 * quantizer noise shaping
2108 * - encoding: Set by user.
2109 * - decoding: unused
2111 int quantizer_noise_shaping;
2115 * is used to decide how many independent tasks should be passed to execute()
2116 * - encoding: Set by user.
2117 * - decoding: Set by user.
2122 * The codec may call this to execute several independent things.
2123 * It will return only after finishing all tasks.
2124 * The user may replace this with some multithreaded implementation,
2125 * the default implementation will execute the parts serially.
2126 * @param count the number of things to execute
2127 * - encoding: Set by libavcodec, user can override.
2128 * - decoding: Set by libavcodec, user can override.
2130 int (*execute)(struct AVCodecContext *c, int (*func)(struct AVCodecContext *c2, void *arg), void *arg2, int *ret, int count, int size);
2134 * Can be used by execute() to store some per AVCodecContext stuff.
2135 * - encoding: set by execute()
2136 * - decoding: set by execute()
2138 void *thread_opaque;
2141 * Motion estimation threshold below which no motion estimation is
2142 * performed, but instead the user specified motion vectors are used.
2144 * - encoding: Set by user.
2145 * - decoding: unused
2150 * Macroblock threshold below which the user specified macroblock types will be used.
2151 * - encoding: Set by user.
2152 * - decoding: unused
2157 * precision of the intra DC coefficient - 8
2158 * - encoding: Set by user.
2159 * - decoding: unused
2161 int intra_dc_precision;
2164 * noise vs. sse weight for the nsse comparsion function
2165 * - encoding: Set by user.
2166 * - decoding: unused
2171 * Number of macroblock rows at the top which are skipped.
2172 * - encoding: unused
2173 * - decoding: Set by user.
2178 * Number of macroblock rows at the bottom which are skipped.
2179 * - encoding: unused
2180 * - decoding: Set by user.
2186 * - encoding: Set by user.
2187 * - decoding: Set by libavcodec.
2190 #define FF_PROFILE_UNKNOWN -99
2192 #define FF_PROFILE_AAC_MAIN 0
2193 #define FF_PROFILE_AAC_LOW 1
2194 #define FF_PROFILE_AAC_SSR 2
2195 #define FF_PROFILE_AAC_LTP 3
2197 #define FF_PROFILE_H264_BASELINE 66
2198 #define FF_PROFILE_H264_MAIN 77
2199 #define FF_PROFILE_H264_EXTENDED 88
2200 #define FF_PROFILE_H264_HIGH 100
2201 #define FF_PROFILE_H264_HIGH_10 110
2202 #define FF_PROFILE_H264_HIGH_422 122
2203 #define FF_PROFILE_H264_HIGH_444 244
2204 #define FF_PROFILE_H264_CAVLC_444 44
2208 * - encoding: Set by user.
2209 * - decoding: Set by libavcodec.
2212 #define FF_LEVEL_UNKNOWN -99
2215 * low resolution decoding, 1-> 1/2 size, 2->1/4 size
2216 * - encoding: unused
2217 * - decoding: Set by user.
2222 * Bitstream width / height, may be different from width/height if lowres
2223 * or other things are used.
2224 * - encoding: unused
2225 * - decoding: Set by user before init if known. Codec should override / dynamically change if needed.
2227 int coded_width, coded_height;
2230 * frame skip threshold
2231 * - encoding: Set by user.
2232 * - decoding: unused
2234 int frame_skip_threshold;
2238 * - encoding: Set by user.
2239 * - decoding: unused
2241 int frame_skip_factor;
2244 * frame skip exponent
2245 * - encoding: Set by user.
2246 * - decoding: unused
2251 * frame skip comparison function
2252 * - encoding: Set by user.
2253 * - decoding: unused
2258 * Border processing masking, raises the quantizer for mbs on the borders
2260 * - encoding: Set by user.
2261 * - decoding: unused
2263 float border_masking;
2266 * minimum MB lagrange multipler
2267 * - encoding: Set by user.
2268 * - decoding: unused
2273 * maximum MB lagrange multipler
2274 * - encoding: Set by user.
2275 * - decoding: unused
2281 * - encoding: Set by user.
2282 * - decoding: unused
2284 int me_penalty_compensation;
2288 * - encoding: unused
2289 * - decoding: Set by user.
2291 enum AVDiscard skip_loop_filter;
2295 * - encoding: unused
2296 * - decoding: Set by user.
2298 enum AVDiscard skip_idct;
2302 * - encoding: unused
2303 * - decoding: Set by user.
2305 enum AVDiscard skip_frame;
2309 * - encoding: Set by user.
2310 * - decoding: unused
2316 * - encoding: Set by user.
2317 * - decoding: unused
2322 * constant rate factor - quality-based VBR - values ~correspond to qps
2323 * - encoding: Set by user.
2324 * - decoding: unused
2329 * constant quantization parameter rate control method
2330 * - encoding: Set by user.
2331 * - decoding: unused
2337 * - encoding: Set by user.
2338 * - decoding: unused
2343 * number of reference frames
2344 * - encoding: Set by user.
2345 * - decoding: Set by lavc.
2350 * chroma qp offset from luma
2351 * - encoding: Set by user.
2352 * - decoding: unused
2357 * Influences how often B-frames are used.
2358 * - encoding: Set by user.
2359 * - decoding: unused
2364 * trellis RD quantization
2365 * - encoding: Set by user.
2366 * - decoding: unused
2371 * Reduce fluctuations in qp (before curve compression).
2372 * - encoding: Set by user.
2373 * - decoding: unused
2375 float complexityblur;
2378 * in-loop deblocking filter alphac0 parameter
2379 * alpha is in the range -6...6
2380 * - encoding: Set by user.
2381 * - decoding: unused
2386 * in-loop deblocking filter beta parameter
2387 * beta is in the range -6...6
2388 * - encoding: Set by user.
2389 * - decoding: unused
2394 * macroblock subpartition sizes to consider - p8x8, p4x4, b8x8, i8x8, i4x4
2395 * - encoding: Set by user.
2396 * - decoding: unused
2399 #define X264_PART_I4X4 0x001 /* Analyze i4x4 */
2400 #define X264_PART_I8X8 0x002 /* Analyze i8x8 (requires 8x8 transform) */
2401 #define X264_PART_P8X8 0x010 /* Analyze p16x8, p8x16 and p8x8 */
2402 #define X264_PART_P4X4 0x020 /* Analyze p8x4, p4x8, p4x4 */
2403 #define X264_PART_B8X8 0x100 /* Analyze b16x8, b8x16 and b8x8 */
2406 * direct MV prediction mode - 0 (none), 1 (spatial), 2 (temporal), 3 (auto)
2407 * - encoding: Set by user.
2408 * - decoding: unused
2413 * Audio cutoff bandwidth (0 means "automatic")
2414 * - encoding: Set by user.
2415 * - decoding: unused
2420 * Multiplied by qscale for each frame and added to scene_change_score.
2421 * - encoding: Set by user.
2422 * - decoding: unused
2424 int scenechange_factor;
2428 * Note: Value depends upon the compare function used for fullpel ME.
2429 * - encoding: Set by user.
2430 * - decoding: unused
2435 * Adjusts sensitivity of b_frame_strategy 1.
2436 * - encoding: Set by user.
2437 * - decoding: unused
2442 * - encoding: Set by user.
2443 * - decoding: unused
2445 int compression_level;
2446 #define FF_COMPRESSION_DEFAULT -1
2448 #if LIBAVCODEC_VERSION_MAJOR < 53
2450 * Sets whether to use LPC mode - used by FLAC encoder.
2451 * - encoding: Set by user.
2452 * - decoding: unused
2453 * @deprecated Deprecated in favor of lpc_type and lpc_passes.
2459 * LPC coefficient precision - used by FLAC encoder
2460 * - encoding: Set by user.
2461 * - decoding: unused
2463 int lpc_coeff_precision;
2466 * - encoding: Set by user.
2467 * - decoding: unused
2469 int min_prediction_order;
2472 * - encoding: Set by user.
2473 * - decoding: unused
2475 int max_prediction_order;
2478 * search method for selecting prediction order
2479 * - encoding: Set by user.
2480 * - decoding: unused
2482 int prediction_order_method;
2485 * - encoding: Set by user.
2486 * - decoding: unused
2488 int min_partition_order;
2491 * - encoding: Set by user.
2492 * - decoding: unused
2494 int max_partition_order;
2497 * GOP timecode frame start number, in non drop frame format
2498 * - encoding: Set by user.
2499 * - decoding: unused
2501 int64_t timecode_frame_start;
2503 #if LIBAVCODEC_VERSION_MAJOR < 53
2505 * Decoder should decode to this many channels if it can (0 for default)
2506 * - encoding: unused
2507 * - decoding: Set by user.
2508 * @deprecated Deprecated in favor of request_channel_layout.
2510 int request_channels;
2514 * Percentage of dynamic range compression to be applied by the decoder.
2515 * The default value is 1.0, corresponding to full compression.
2516 * - encoding: unused
2517 * - decoding: Set by user.
2522 * opaque 64bit number (generally a PTS) that will be reordered and
2523 * output in AVFrame.reordered_opaque
2524 * - encoding: unused
2525 * - decoding: Set by user.
2527 int64_t reordered_opaque;
2530 * Bits per sample/pixel of internal libavcodec pixel/sample format.
2531 * This field is applicable only when sample_fmt is SAMPLE_FMT_S32.
2532 * - encoding: set by user.
2533 * - decoding: set by libavcodec.
2535 int bits_per_raw_sample;
2538 * Audio channel layout.
2539 * - encoding: set by user.
2540 * - decoding: set by libavcodec.
2542 int64_t channel_layout;
2545 * Request decoder to use this channel layout if it can (0 for default)
2546 * - encoding: unused
2547 * - decoding: Set by user.
2549 int64_t request_channel_layout;
2552 * Ratecontrol attempt to use, at maximum, <value> of what can be used without an underflow.
2553 * - encoding: Set by user.
2554 * - decoding: unused.
2556 float rc_max_available_vbv_use;
2559 * Ratecontrol attempt to use, at least, <value> times the amount needed to prevent a vbv overflow.
2560 * - encoding: Set by user.
2561 * - decoding: unused.
2563 float rc_min_vbv_overflow_use;
2566 * Hardware accelerator in use
2567 * - encoding: unused.
2568 * - decoding: Set by libavcodec
2570 struct AVHWAccel *hwaccel;
2573 * For some codecs, the time base is closer to the field rate than the frame rate.
2574 * Most notably, H.264 and MPEG-2 specify time_base as half of frame duration
2575 * if no telecine is used ...
2577 * Set to time_base ticks per frame. Default 1, e.g., H.264/MPEG-2 set it to 2.
2579 int ticks_per_frame;
2582 * Hardware accelerator context.
2583 * For some hardware accelerators, a global context needs to be
2584 * provided by the user. In that case, this holds display-dependent
2585 * data FFmpeg cannot instantiate itself. Please refer to the
2586 * FFmpeg HW accelerator documentation to know how to fill this
2587 * is. e.g. for VA API, this is a struct vaapi_context.
2588 * - encoding: unused
2589 * - decoding: Set by user
2591 void *hwaccel_context;
2594 * Chromaticity coordinates of the source primaries.
2595 * - encoding: Set by user
2596 * - decoding: Set by libavcodec
2598 enum AVColorPrimaries color_primaries;
2601 * Color Transfer Characteristic.
2602 * - encoding: Set by user
2603 * - decoding: Set by libavcodec
2605 enum AVColorTransferCharacteristic color_trc;
2608 * YUV colorspace type.
2609 * - encoding: Set by user
2610 * - decoding: Set by libavcodec
2612 enum AVColorSpace colorspace;
2615 * MPEG vs JPEG YUV range.
2616 * - encoding: Set by user
2617 * - decoding: Set by libavcodec
2619 enum AVColorRange color_range;
2622 * This defines the location of chroma samples.
2623 * - encoding: Set by user
2624 * - decoding: Set by libavcodec
2626 enum AVChromaLocation chroma_sample_location;
2629 * The codec may call this to execute several independent things.
2630 * It will return only after finishing all tasks.
2631 * The user may replace this with some multithreaded implementation,
2632 * the default implementation will execute the parts serially.
2633 * Also see avcodec_thread_init and e.g. the --enable-pthread configure option.
2634 * @param c context passed also to func
2635 * @param count the number of things to execute
2636 * @param arg2 argument passed unchanged to func
2637 * @param ret return values of executed functions, must have space for "count" values. May be NULL.
2638 * @param func function that will be called count times, with jobnr from 0 to count-1.
2639 * threadnr will be in the range 0 to c->thread_count-1 < MAX_THREADS and so that no
2640 * two instances of func executing at the same time will have the same threadnr.
2641 * @return always 0 currently, but code should handle a future improvement where when any call to func
2642 * returns < 0 no further calls to func may be done and < 0 is returned.
2643 * - encoding: Set by libavcodec, user can override.
2644 * - decoding: Set by libavcodec, user can override.
2646 int (*execute2)(struct AVCodecContext *c, int (*func)(struct AVCodecContext *c2, void *arg, int jobnr, int threadnr), void *arg2, int *ret, int count);
2649 * explicit P-frame weighted prediction analysis method
2651 * 1: fast blind weighting (one reference duplicate with -1 offset)
2652 * 2: smart weighting (full fade detection analysis)
2653 * - encoding: Set by user.
2654 * - decoding: unused
2656 int weighted_p_pred;
2661 * 1: Variance AQ (complexity mask)
2662 * 2: Auto-variance AQ (experimental)
2663 * - encoding: Set by user
2664 * - decoding: unused
2670 * Reduces blocking and blurring in flat and textured areas.
2671 * - encoding: Set by user
2672 * - decoding: unused
2678 * Strength of psychovisual optimization
2679 * - encoding: Set by user
2680 * - decoding: unused
2686 * Strength of psychovisual optimization
2687 * - encoding: Set by user
2688 * - decoding: unused
2694 * Number of frames for frametype and ratecontrol lookahead
2695 * - encoding: Set by user
2696 * - decoding: unused
2701 * Constant rate factor maximum
2702 * With CRF encoding mode and VBV restrictions enabled, prevents quality from being worse
2703 * than crf_max, even if doing so would violate VBV restrictions.
2704 * - encoding: Set by user.
2705 * - decoding: unused
2709 int log_level_offset;
2712 * Determines which LPC analysis algorithm to use.
2713 * - encoding: Set by user
2714 * - decoding: unused
2716 enum AVLPCType lpc_type;
2719 * Number of passes to use for Cholesky factorization during LPC analysis
2720 * - encoding: Set by user
2721 * - decoding: unused
2729 typedef struct AVCodec {
2731 * Name of the codec implementation.
2732 * The name is globally unique among encoders and among decoders (but an
2733 * encoder and a decoder can share the same name).
2734 * This is the primary way to find a codec from the user perspective.
2737 enum AVMediaType type;
2740 int (*init)(AVCodecContext *);
2741 int (*encode)(AVCodecContext *, uint8_t *buf, int buf_size, void *data);
2742 int (*close)(AVCodecContext *);
2743 int (*decode)(AVCodecContext *, void *outdata, int *outdata_size, AVPacket *avpkt);
2745 * Codec capabilities.
2749 struct AVCodec *next;
2752 * Will be called when seeking
2754 void (*flush)(AVCodecContext *);
2755 const AVRational *supported_framerates; ///< array of supported framerates, or NULL if any, array is terminated by {0,0}
2756 const enum PixelFormat *pix_fmts; ///< array of supported pixel formats, or NULL if unknown, array is terminated by -1
2758 * Descriptive name for the codec, meant to be more human readable than name.
2759 * You should use the NULL_IF_CONFIG_SMALL() macro to define it.
2761 const char *long_name;
2762 const int *supported_samplerates; ///< array of supported audio samplerates, or NULL if unknown, array is terminated by 0
2763 const enum SampleFormat *sample_fmts; ///< array of supported sample formats, or NULL if unknown, array is terminated by -1
2764 const int64_t *channel_layouts; ///< array of support channel layouts, or NULL if unknown. array is terminated by 0
2765 uint8_t max_lowres; ///< maximum value for lowres supported by the decoder
2771 typedef struct AVHWAccel {
2773 * Name of the hardware accelerated codec.
2774 * The name is globally unique among encoders and among decoders (but an
2775 * encoder and a decoder can share the same name).
2780 * Type of codec implemented by the hardware accelerator.
2782 * See AVMEDIA_TYPE_xxx
2784 enum AVMediaType type;
2787 * Codec implemented by the hardware accelerator.
2794 * Supported pixel format.
2796 * Only hardware accelerated formats are supported here.
2798 enum PixelFormat pix_fmt;
2801 * Hardware accelerated codec capabilities.
2802 * see FF_HWACCEL_CODEC_CAP_*
2806 struct AVHWAccel *next;
2809 * Called at the beginning of each frame or field picture.
2811 * Meaningful frame information (codec specific) is guaranteed to
2812 * be parsed at this point. This function is mandatory.
2814 * Note that buf can be NULL along with buf_size set to 0.
2815 * Otherwise, this means the whole frame is available at this point.
2817 * @param avctx the codec context
2818 * @param buf the frame data buffer base
2819 * @param buf_size the size of the frame in bytes
2820 * @return zero if successful, a negative value otherwise
2822 int (*start_frame)(AVCodecContext *avctx, const uint8_t *buf, uint32_t buf_size);
2825 * Callback for each slice.
2827 * Meaningful slice information (codec specific) is guaranteed to
2828 * be parsed at this point. This function is mandatory.
2830 * @param avctx the codec context
2831 * @param buf the slice data buffer base
2832 * @param buf_size the size of the slice in bytes
2833 * @return zero if successful, a negative value otherwise
2835 int (*decode_slice)(AVCodecContext *avctx, const uint8_t *buf, uint32_t buf_size);
2838 * Called at the end of each frame or field picture.
2840 * The whole picture is parsed at this point and can now be sent
2841 * to the hardware accelerator. This function is mandatory.
2843 * @param avctx the codec context
2844 * @return zero if successful, a negative value otherwise
2846 int (*end_frame)(AVCodecContext *avctx);
2849 * Size of HW accelerator private data.
2851 * Private data is allocated with av_mallocz() before
2852 * AVCodecContext.get_buffer() and deallocated after
2853 * AVCodecContext.release_buffer().
2859 * four components are given, that's all.
2860 * the last component is alpha
2862 typedef struct AVPicture {
2864 int linesize[4]; ///< number of bytes per line
2867 #if FF_API_PALETTE_CONTROL
2870 * This structure defines a method for communicating palette changes
2871 * between and demuxer and a decoder.
2873 * @deprecated Use AVPacket to send palette changes instead.
2874 * This is totally broken.
2876 #define AVPALETTE_SIZE 1024
2877 #define AVPALETTE_COUNT 256
2878 typedef struct AVPaletteControl {
2880 /* Demuxer sets this to 1 to indicate the palette has changed;
2881 * decoder resets to 0. */
2882 int palette_changed;
2884 /* 4-byte ARGB palette entries, stored in native byte order; note that
2885 * the individual palette components should be on a 8-bit scale; if
2886 * the palette data comes from an IBM VGA native format, the component
2887 * data is probably 6 bits in size and needs to be scaled. */
2888 unsigned int palette[AVPALETTE_COUNT];
2890 } AVPaletteControl attribute_deprecated;
2893 enum AVSubtitleType {
2896 SUBTITLE_BITMAP, ///< A bitmap, pict will be set
2899 * Plain text, the text field must be set by the decoder and is
2900 * authoritative. ass and pict fields may contain approximations.
2905 * Formatted text, the ass field must be set by the decoder and is
2906 * authoritative. pict and text fields may contain approximations.
2911 typedef struct AVSubtitleRect {
2912 int x; ///< top left corner of pict, undefined when pict is not set
2913 int y; ///< top left corner of pict, undefined when pict is not set
2914 int w; ///< width of pict, undefined when pict is not set
2915 int h; ///< height of pict, undefined when pict is not set
2916 int nb_colors; ///< number of colors in pict, undefined when pict is not set
2919 * data+linesize for the bitmap of this subtitle.
2920 * can be set for text/ass as well once they where rendered
2923 enum AVSubtitleType type;
2925 char *text; ///< 0 terminated plain UTF-8 text
2928 * 0 terminated ASS/SSA compatible event line.
2929 * The pressentation of this is unaffected by the other values in this
2935 typedef struct AVSubtitle {
2936 uint16_t format; /* 0 = graphics */
2937 uint32_t start_display_time; /* relative to packet pts, in ms */
2938 uint32_t end_display_time; /* relative to packet pts, in ms */
2940 AVSubtitleRect **rects;
2941 int64_t pts; ///< Same as packet pts, in AV_TIME_BASE
2944 /* packet functions */
2947 * @deprecated use NULL instead
2949 attribute_deprecated void av_destruct_packet_nofree(AVPacket *pkt);
2952 * Default packet destructor.
2954 void av_destruct_packet(AVPacket *pkt);
2957 * Initialize optional fields of a packet with default values.
2961 void av_init_packet(AVPacket *pkt);
2964 * Allocate the payload of a packet and initialize its fields with
2968 * @param size wanted payload size
2969 * @return 0 if OK, AVERROR_xxx otherwise
2971 int av_new_packet(AVPacket *pkt, int size);
2974 * Reduce packet size, correctly zeroing padding
2977 * @param size new size
2979 void av_shrink_packet(AVPacket *pkt, int size);
2982 * @warning This is a hack - the packet memory allocation stuff is broken. The
2983 * packet is allocated if it was not really allocated.
2985 int av_dup_packet(AVPacket *pkt);
2990 * @param pkt packet to free
2992 void av_free_packet(AVPacket *pkt);
2996 struct ReSampleContext;
2997 struct AVResampleContext;
2999 typedef struct ReSampleContext ReSampleContext;
3001 #if LIBAVCODEC_VERSION_MAJOR < 53
3003 * @deprecated Use av_audio_resample_init() instead.
3005 attribute_deprecated ReSampleContext *audio_resample_init(int output_channels, int input_channels,
3006 int output_rate, int input_rate);
3009 * Initialize audio resampling context
3011 * @param output_channels number of output channels
3012 * @param input_channels number of input channels
3013 * @param output_rate output sample rate
3014 * @param input_rate input sample rate
3015 * @param sample_fmt_out requested output sample format
3016 * @param sample_fmt_in input sample format
3017 * @param filter_length length of each FIR filter in the filterbank relative to the cutoff freq
3018 * @param log2_phase_count log2 of the number of entries in the polyphase filterbank
3019 * @param linear If 1 then the used FIR filter will be linearly interpolated
3020 between the 2 closest, if 0 the closest will be used
3021 * @param cutoff cutoff frequency, 1.0 corresponds to half the output sampling rate
3022 * @return allocated ReSampleContext, NULL if error occured
3024 ReSampleContext *av_audio_resample_init(int output_channels, int input_channels,
3025 int output_rate, int input_rate,
3026 enum SampleFormat sample_fmt_out,
3027 enum SampleFormat sample_fmt_in,
3028 int filter_length, int log2_phase_count,
3029 int linear, double cutoff);
3031 int audio_resample(ReSampleContext *s, short *output, short *input, int nb_samples);
3032 void audio_resample_close(ReSampleContext *s);
3036 * Initialize an audio resampler.
3037 * Note, if either rate is not an integer then simply scale both rates up so they are.
3038 * @param filter_length length of each FIR filter in the filterbank relative to the cutoff freq
3039 * @param log2_phase_count log2 of the number of entries in the polyphase filterbank
3040 * @param linear If 1 then the used FIR filter will be linearly interpolated
3041 between the 2 closest, if 0 the closest will be used
3042 * @param cutoff cutoff frequency, 1.0 corresponds to half the output sampling rate
3044 struct AVResampleContext *av_resample_init(int out_rate, int in_rate, int filter_length, int log2_phase_count, int linear, double cutoff);
3047 * Resample an array of samples using a previously configured context.
3048 * @param src an array of unconsumed samples
3049 * @param consumed the number of samples of src which have been consumed are returned here
3050 * @param src_size the number of unconsumed samples available
3051 * @param dst_size the amount of space in samples available in dst
3052 * @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.
3053 * @return the number of samples written in dst or -1 if an error occurred
3055 int av_resample(struct AVResampleContext *c, short *dst, short *src, int *consumed, int src_size, int dst_size, int update_ctx);
3059 * Compensate samplerate/timestamp drift. The compensation is done by changing
3060 * the resampler parameters, so no audible clicks or similar distortions occur
3061 * @param compensation_distance distance in output samples over which the compensation should be performed
3062 * @param sample_delta number of output samples which should be output less
3064 * example: av_resample_compensate(c, 10, 500)
3065 * here instead of 510 samples only 500 samples would be output
3067 * note, due to rounding the actual compensation might be slightly different,
3068 * especially if the compensation_distance is large and the in_rate used during init is small
3070 void av_resample_compensate(struct AVResampleContext *c, int sample_delta, int compensation_distance);
3071 void av_resample_close(struct AVResampleContext *c);
3074 * Allocate memory for a picture. Call avpicture_free to free it.
3076 * @param picture the picture to be filled in
3077 * @param pix_fmt the format of the picture
3078 * @param width the width of the picture
3079 * @param height the height of the picture
3080 * @return zero if successful, a negative value if not
3082 int avpicture_alloc(AVPicture *picture, enum PixelFormat pix_fmt, int width, int height);
3085 * Free a picture previously allocated by avpicture_alloc().
3087 * @param picture the AVPicture to be freed
3089 void avpicture_free(AVPicture *picture);
3092 * Fill in the AVPicture fields.
3093 * The fields of the given AVPicture are filled in by using the 'ptr' address
3094 * which points to the image data buffer. Depending on the specified picture
3095 * format, one or multiple image data pointers and line sizes will be set.
3096 * If a planar format is specified, several pointers will be set pointing to
3097 * the different picture planes and the line sizes of the different planes
3098 * will be stored in the lines_sizes array.
3099 * Call with ptr == NULL to get the required size for the ptr buffer.
3101 * @param picture AVPicture whose fields are to be filled in
3102 * @param ptr Buffer which will contain or contains the actual image data
3103 * @param pix_fmt The format in which the picture data is stored.
3104 * @param width the width of the image in pixels
3105 * @param height the height of the image in pixels
3106 * @return size of the image data in bytes
3108 int avpicture_fill(AVPicture *picture, uint8_t *ptr,
3109 enum PixelFormat pix_fmt, int width, int height);
3110 int avpicture_layout(const AVPicture* src, enum PixelFormat pix_fmt, int width, int height,
3111 unsigned char *dest, int dest_size);
3114 * Calculate the size in bytes that a picture of the given width and height
3115 * would occupy if stored in the given picture format.
3116 * Note that this returns the size of a compact representation as generated
3117 * by avpicture_layout, which can be smaller than the size required for e.g.
3120 * @param pix_fmt the given picture format
3121 * @param width the width of the image
3122 * @param height the height of the image
3123 * @return Image data size in bytes or -1 on error (e.g. too large dimensions).
3125 int avpicture_get_size(enum PixelFormat pix_fmt, int width, int height);
3126 void avcodec_get_chroma_sub_sample(enum PixelFormat pix_fmt, int *h_shift, int *v_shift);
3127 const char *avcodec_get_pix_fmt_name(enum PixelFormat pix_fmt);
3128 void avcodec_set_dimensions(AVCodecContext *s, int width, int height);
3130 #if LIBAVCODEC_VERSION_MAJOR < 53
3132 * Return the pixel format corresponding to the name name.
3134 * If there is no pixel format with name name, then look for a
3135 * pixel format with the name corresponding to the native endian
3137 * For example in a little-endian system, first look for "gray16",
3138 * then for "gray16le".
3140 * Finally if no pixel format has been found, return PIX_FMT_NONE.
3142 * @deprecated Deprecated in favor of av_get_pix_fmt().
3144 attribute_deprecated enum PixelFormat avcodec_get_pix_fmt(const char* name);
3148 * Return a value representing the fourCC code associated to the
3149 * pixel format pix_fmt, or 0 if no associated fourCC code can be
3152 unsigned int avcodec_pix_fmt_to_codec_tag(enum PixelFormat pix_fmt);
3155 * Put a string representing the codec tag codec_tag in buf.
3157 * @param buf_size size in bytes of buf
3158 * @return the length of the string that would have been generated if
3159 * enough space had been available, excluding the trailing null
3161 size_t av_get_codec_tag_string(char *buf, size_t buf_size, unsigned int codec_tag);
3163 #define FF_LOSS_RESOLUTION 0x0001 /**< loss due to resolution change */
3164 #define FF_LOSS_DEPTH 0x0002 /**< loss due to color depth change */
3165 #define FF_LOSS_COLORSPACE 0x0004 /**< loss due to color space conversion */
3166 #define FF_LOSS_ALPHA 0x0008 /**< loss of alpha bits */
3167 #define FF_LOSS_COLORQUANT 0x0010 /**< loss due to color quantization */
3168 #define FF_LOSS_CHROMA 0x0020 /**< loss of chroma (e.g. RGB to gray conversion) */
3171 * Compute what kind of losses will occur when converting from one specific
3172 * pixel format to another.
3173 * When converting from one pixel format to another, information loss may occur.
3174 * For example, when converting from RGB24 to GRAY, the color information will
3175 * be lost. Similarly, other losses occur when converting from some formats to
3176 * other formats. These losses can involve loss of chroma, but also loss of
3177 * resolution, loss of color depth, loss due to the color space conversion, loss
3178 * of the alpha bits or loss due to color quantization.
3179 * avcodec_get_fix_fmt_loss() informs you about the various types of losses
3180 * which will occur when converting from one pixel format to another.
3182 * @param[in] dst_pix_fmt destination pixel format
3183 * @param[in] src_pix_fmt source pixel format
3184 * @param[in] has_alpha Whether the source pixel format alpha channel is used.
3185 * @return Combination of flags informing you what kind of losses will occur.
3187 int avcodec_get_pix_fmt_loss(enum PixelFormat dst_pix_fmt, enum PixelFormat src_pix_fmt,
3191 * Find the best pixel format to convert to given a certain source pixel
3192 * format. When converting from one pixel format to another, information loss
3193 * may occur. For example, when converting from RGB24 to GRAY, the color
3194 * information will be lost. Similarly, other losses occur when converting from
3195 * some formats to other formats. avcodec_find_best_pix_fmt() searches which of
3196 * the given pixel formats should be used to suffer the least amount of loss.
3197 * The pixel formats from which it chooses one, are determined by the
3198 * pix_fmt_mask parameter.
3201 * src_pix_fmt = PIX_FMT_YUV420P;
3202 * pix_fmt_mask = (1 << PIX_FMT_YUV422P) || (1 << PIX_FMT_RGB24);
3203 * dst_pix_fmt = avcodec_find_best_pix_fmt(pix_fmt_mask, src_pix_fmt, alpha, &loss);
3206 * @param[in] pix_fmt_mask bitmask determining which pixel format to choose from
3207 * @param[in] src_pix_fmt source pixel format
3208 * @param[in] has_alpha Whether the source pixel format alpha channel is used.
3209 * @param[out] loss_ptr Combination of flags informing you what kind of losses will occur.
3210 * @return The best pixel format to convert to or -1 if none was found.
3212 enum PixelFormat avcodec_find_best_pix_fmt(int64_t pix_fmt_mask, enum PixelFormat src_pix_fmt,
3213 int has_alpha, int *loss_ptr);
3217 * Print in buf the string corresponding to the pixel format with
3218 * number pix_fmt, or an header if pix_fmt is negative.
3220 * @param[in] buf the buffer where to write the string
3221 * @param[in] buf_size the size of buf
3222 * @param[in] pix_fmt the number of the pixel format to print the corresponding info string, or
3223 * a negative value to print the corresponding header.
3224 * Meaningful values for obtaining a pixel format info vary from 0 to PIX_FMT_NB -1.
3226 void avcodec_pix_fmt_string (char *buf, int buf_size, enum PixelFormat pix_fmt);
3228 #define FF_ALPHA_TRANSP 0x0001 /* image has some totally transparent pixels */
3229 #define FF_ALPHA_SEMI_TRANSP 0x0002 /* image has some transparent pixels */
3232 * Tell if an image really has transparent alpha values.
3233 * @return ored mask of FF_ALPHA_xxx constants
3235 int img_get_alpha_info(const AVPicture *src,
3236 enum PixelFormat pix_fmt, int width, int height);
3238 /* deinterlace a picture */
3239 /* deinterlace - if not supported return -1 */
3240 int avpicture_deinterlace(AVPicture *dst, const AVPicture *src,
3241 enum PixelFormat pix_fmt, int width, int height);
3243 /* external high level API */
3246 * If c is NULL, returns the first registered codec,
3247 * if c is non-NULL, returns the next registered codec after c,
3248 * or NULL if c is the last one.
3250 AVCodec *av_codec_next(AVCodec *c);
3253 * Return the LIBAVCODEC_VERSION_INT constant.
3255 unsigned avcodec_version(void);
3258 * Return the libavcodec build-time configuration.
3260 const char *avcodec_configuration(void);
3263 * Return the libavcodec license.
3265 const char *avcodec_license(void);
3268 * Initialize libavcodec.
3270 * @warning This function must be called before any other libavcodec
3273 void avcodec_init(void);
3275 #if LIBAVCODEC_VERSION_MAJOR < 53
3277 * @deprecated Deprecated in favor of avcodec_register().
3279 attribute_deprecated void register_avcodec(AVCodec *codec);
3283 * Register the codec codec and initialize libavcodec.
3285 * @see avcodec_init()
3287 void avcodec_register(AVCodec *codec);
3290 * Find a registered encoder with a matching codec ID.
3292 * @param id CodecID of the requested encoder
3293 * @return An encoder if one was found, NULL otherwise.
3295 AVCodec *avcodec_find_encoder(enum CodecID id);
3298 * Find a registered encoder with the specified name.
3300 * @param name name of the requested encoder
3301 * @return An encoder if one was found, NULL otherwise.
3303 AVCodec *avcodec_find_encoder_by_name(const char *name);
3306 * Find a registered decoder with a matching codec ID.
3308 * @param id CodecID of the requested decoder
3309 * @return A decoder if one was found, NULL otherwise.
3311 AVCodec *avcodec_find_decoder(enum CodecID id);
3314 * Find a registered decoder with the specified name.
3316 * @param name name of the requested decoder
3317 * @return A decoder if one was found, NULL otherwise.
3319 AVCodec *avcodec_find_decoder_by_name(const char *name);
3320 void avcodec_string(char *buf, int buf_size, AVCodecContext *enc, int encode);
3323 * Set the fields of the given AVCodecContext to default values.
3325 * @param s The AVCodecContext of which the fields should be set to default values.
3327 void avcodec_get_context_defaults(AVCodecContext *s);
3329 /** THIS FUNCTION IS NOT YET PART OF THE PUBLIC API!
3330 * we WILL change its arguments and name a few times! */
3331 void avcodec_get_context_defaults2(AVCodecContext *s, enum AVMediaType);
3334 * Allocate an AVCodecContext and set its fields to default values. The
3335 * resulting struct can be deallocated by simply calling av_free().
3337 * @return An AVCodecContext filled with default values or NULL on failure.
3338 * @see avcodec_get_context_defaults
3340 AVCodecContext *avcodec_alloc_context(void);
3342 /** THIS FUNCTION IS NOT YET PART OF THE PUBLIC API!
3343 * we WILL change its arguments and name a few times! */
3344 AVCodecContext *avcodec_alloc_context2(enum AVMediaType);
3347 * Copy the settings of the source AVCodecContext into the destination
3348 * AVCodecContext. The resulting destination codec context will be
3349 * unopened, i.e. you are required to call avcodec_open() before you
3350 * can use this AVCodecContext to decode/encode video/audio data.
3352 * @param dest target codec context, should be initialized with
3353 * avcodec_alloc_context(), but otherwise uninitialized
3354 * @param src source codec context
3355 * @return AVERROR() on error (e.g. memory allocation error), 0 on success
3357 int avcodec_copy_context(AVCodecContext *dest, const AVCodecContext *src);
3360 * Set the fields of the given AVFrame to default values.
3362 * @param pic The AVFrame of which the fields should be set to default values.
3364 void avcodec_get_frame_defaults(AVFrame *pic);
3367 * Allocate an AVFrame and set its fields to default values. The resulting
3368 * struct can be deallocated by simply calling av_free().
3370 * @return An AVFrame filled with default values or NULL on failure.
3371 * @see avcodec_get_frame_defaults
3373 AVFrame *avcodec_alloc_frame(void);
3375 int avcodec_default_get_buffer(AVCodecContext *s, AVFrame *pic);
3376 void avcodec_default_release_buffer(AVCodecContext *s, AVFrame *pic);
3377 int avcodec_default_reget_buffer(AVCodecContext *s, AVFrame *pic);
3380 * Return the amount of padding in pixels which the get_buffer callback must
3381 * provide around the edge of the image for codecs which do not have the
3382 * CODEC_FLAG_EMU_EDGE flag.
3384 * @return Required padding in pixels.
3386 unsigned avcodec_get_edge_width(void);
3388 * Modify width and height values so that they will result in a memory
3389 * buffer that is acceptable for the codec if you do not use any horizontal
3392 * May only be used if a codec with CODEC_CAP_DR1 has been opened.
3393 * If CODEC_FLAG_EMU_EDGE is not set, the dimensions must have been increased
3394 * according to avcodec_get_edge_width() before.
3396 void avcodec_align_dimensions(AVCodecContext *s, int *width, int *height);
3398 * Modify width and height values so that they will result in a memory
3399 * buffer that is acceptable for the codec if you also ensure that all
3400 * line sizes are a multiple of the respective linesize_align[i].
3402 * May only be used if a codec with CODEC_CAP_DR1 has been opened.
3403 * If CODEC_FLAG_EMU_EDGE is not set, the dimensions must have been increased
3404 * according to avcodec_get_edge_width() before.
3406 void avcodec_align_dimensions2(AVCodecContext *s, int *width, int *height,
3407 int linesize_align[4]);
3409 #if LIBAVCODEC_VERSION_MAJOR < 53
3411 * @deprecated Deprecated in favor of av_check_image_size().
3413 attribute_deprecated
3414 int avcodec_check_dimensions(void *av_log_ctx, unsigned int w, unsigned int h);
3417 enum PixelFormat avcodec_default_get_format(struct AVCodecContext *s, const enum PixelFormat * fmt);
3419 int avcodec_thread_init(AVCodecContext *s, int thread_count);
3420 void avcodec_thread_free(AVCodecContext *s);
3421 int avcodec_default_execute(AVCodecContext *c, int (*func)(AVCodecContext *c2, void *arg2),void *arg, int *ret, int count, int size);
3422 int avcodec_default_execute2(AVCodecContext *c, int (*func)(AVCodecContext *c2, void *arg2, int, int),void *arg, int *ret, int count);
3423 //FIXME func typedef
3426 * Initialize the AVCodecContext to use the given AVCodec. Prior to using this
3427 * function the context has to be allocated.
3429 * The functions avcodec_find_decoder_by_name(), avcodec_find_encoder_by_name(),
3430 * avcodec_find_decoder() and avcodec_find_encoder() provide an easy way for
3431 * retrieving a codec.
3433 * @warning This function is not thread safe!
3436 * avcodec_register_all();
3437 * codec = avcodec_find_decoder(CODEC_ID_H264);
3441 * context = avcodec_alloc_context();
3443 * if (avcodec_open(context, codec) < 0)
3447 * @param avctx The context which will be set up to use the given codec.
3448 * @param codec The codec to use within the context.
3449 * @return zero on success, a negative value on error
3450 * @see avcodec_alloc_context, avcodec_find_decoder, avcodec_find_encoder
3452 int avcodec_open(AVCodecContext *avctx, AVCodec *codec);
3454 #if LIBAVCODEC_VERSION_MAJOR < 53
3456 * Decode an audio frame from buf into samples.
3457 * Wrapper function which calls avcodec_decode_audio3.
3459 * @deprecated Use avcodec_decode_audio3 instead.
3460 * @param avctx the codec context
3461 * @param[out] samples the output buffer
3462 * @param[in,out] frame_size_ptr the output buffer size in bytes
3463 * @param[in] buf the input buffer
3464 * @param[in] buf_size the input buffer size in bytes
3465 * @return On error a negative value is returned, otherwise the number of bytes
3466 * used or zero if no frame could be decompressed.
3468 attribute_deprecated int avcodec_decode_audio2(AVCodecContext *avctx, int16_t *samples,
3469 int *frame_size_ptr,
3470 const uint8_t *buf, int buf_size);
3474 * Decode the audio frame of size avpkt->size from avpkt->data into samples.
3475 * Some decoders may support multiple frames in a single AVPacket, such
3476 * decoders would then just decode the first frame. In this case,
3477 * avcodec_decode_audio3 has to be called again with an AVPacket that contains
3478 * the remaining data in order to decode the second frame etc.
3480 * could be outputted, frame_size_ptr is zero. Otherwise, it is the
3481 * decompressed frame size in bytes.
3483 * @warning You must set frame_size_ptr to the allocated size of the
3484 * output buffer before calling avcodec_decode_audio3().
3486 * @warning The input buffer must be FF_INPUT_BUFFER_PADDING_SIZE larger than
3487 * the actual read bytes because some optimized bitstream readers read 32 or 64
3488 * bits at once and could read over the end.
3490 * @warning The end of the input buffer avpkt->data should be set to 0 to ensure that
3491 * no overreading happens for damaged MPEG streams.
3493 * @note You might have to align the input buffer avpkt->data and output buffer
3494 * samples. The alignment requirements depend on the CPU: On some CPUs it isn't
3495 * necessary at all, on others it won't work at all if not aligned and on others
3496 * it will work but it will have an impact on performance.
3498 * In practice, avpkt->data should have 4 byte alignment at minimum and
3499 * samples should be 16 byte aligned unless the CPU doesn't need it
3500 * (AltiVec and SSE do).
3502 * @param avctx the codec context
3503 * @param[out] samples the output buffer, sample type in avctx->sample_fmt
3504 * @param[in,out] frame_size_ptr the output buffer size in bytes
3505 * @param[in] avpkt The input AVPacket containing the input buffer.
3506 * You can create such packet with av_init_packet() and by then setting
3507 * data and size, some decoders might in addition need other fields.
3508 * All decoders are designed to use the least fields possible though.
3509 * @return On error a negative value is returned, otherwise the number of bytes
3510 * used or zero if no frame data was decompressed (used) from the input AVPacket.
3512 int avcodec_decode_audio3(AVCodecContext *avctx, int16_t *samples,
3513 int *frame_size_ptr,
3516 #if LIBAVCODEC_VERSION_MAJOR < 53
3518 * Decode a video frame from buf into picture.
3519 * Wrapper function which calls avcodec_decode_video2.
3521 * @deprecated Use avcodec_decode_video2 instead.
3522 * @param avctx the codec context
3523 * @param[out] picture The AVFrame in which the decoded video frame will be stored.
3524 * @param[in] buf the input buffer
3525 * @param[in] buf_size the size of the input buffer in bytes
3526 * @param[in,out] got_picture_ptr Zero if no frame could be decompressed, otherwise, it is nonzero.
3527 * @return On error a negative value is returned, otherwise the number of bytes
3528 * used or zero if no frame could be decompressed.
3530 attribute_deprecated int avcodec_decode_video(AVCodecContext *avctx, AVFrame *picture,
3531 int *got_picture_ptr,
3532 const uint8_t *buf, int buf_size);
3536 * Decode the video frame of size avpkt->size from avpkt->data into picture.
3537 * Some decoders may support multiple frames in a single AVPacket, such
3538 * decoders would then just decode the first frame.
3540 * @warning The input buffer must be FF_INPUT_BUFFER_PADDING_SIZE larger than
3541 * the actual read bytes because some optimized bitstream readers read 32 or 64
3542 * bits at once and could read over the end.
3544 * @warning The end of the input buffer buf should be set to 0 to ensure that
3545 * no overreading happens for damaged MPEG streams.
3547 * @note You might have to align the input buffer avpkt->data.
3548 * The alignment requirements depend on the CPU: on some CPUs it isn't
3549 * necessary at all, on others it won't work at all if not aligned and on others
3550 * it will work but it will have an impact on performance.
3552 * In practice, avpkt->data should have 4 byte alignment at minimum.
3554 * @note Some codecs have a delay between input and output, these need to be
3555 * fed with avpkt->data=NULL, avpkt->size=0 at the end to return the remaining frames.
3557 * @param avctx the codec context
3558 * @param[out] picture The AVFrame in which the decoded video frame will be stored.
3559 * Use avcodec_alloc_frame to get an AVFrame, the codec will
3560 * allocate memory for the actual bitmap.
3561 * with default get/release_buffer(), the decoder frees/reuses the bitmap as it sees fit.
3562 * with overridden get/release_buffer() (needs CODEC_CAP_DR1) the user decides into what buffer the decoder
3563 * decodes and the decoder tells the user once it does not need the data anymore,
3564 * the user app can at this point free/reuse/keep the memory as it sees fit.
3566 * @param[in] avpkt The input AVpacket containing the input buffer.
3567 * You can create such packet with av_init_packet() and by then setting
3568 * data and size, some decoders might in addition need other fields like
3569 * flags&AV_PKT_FLAG_KEY. All decoders are designed to use the least
3571 * @param[in,out] got_picture_ptr Zero if no frame could be decompressed, otherwise, it is nonzero.
3572 * @return On error a negative value is returned, otherwise the number of bytes
3573 * used or zero if no frame could be decompressed.
3575 int avcodec_decode_video2(AVCodecContext *avctx, AVFrame *picture,
3576 int *got_picture_ptr,
3579 #if LIBAVCODEC_VERSION_MAJOR < 53
3580 /* Decode a subtitle message. Return -1 if error, otherwise return the
3581 * number of bytes used. If no subtitle could be decompressed,
3582 * got_sub_ptr is zero. Otherwise, the subtitle is stored in *sub. */
3583 attribute_deprecated int avcodec_decode_subtitle(AVCodecContext *avctx, AVSubtitle *sub,
3585 const uint8_t *buf, int buf_size);
3589 * Decode a subtitle message.
3590 * Return a negative value on error, otherwise return the number of bytes used.
3591 * If no subtitle could be decompressed, got_sub_ptr is zero.
3592 * Otherwise, the subtitle is stored in *sub.
3593 * Note that CODEC_CAP_DR1 is not available for subtitle codecs. This is for
3594 * simplicity, because the performance difference is expect to be negligible
3595 * and reusing a get_buffer written for video codecs would probably perform badly
3596 * due to a potentially very different allocation pattern.
3598 * @param avctx the codec context
3599 * @param[out] sub The AVSubtitle in which the decoded subtitle will be stored, must be
3600 freed with avsubtitle_free if *got_sub_ptr is set.
3601 * @param[in,out] got_sub_ptr Zero if no subtitle could be decompressed, otherwise, it is nonzero.
3602 * @param[in] avpkt The input AVPacket containing the input buffer.
3604 int avcodec_decode_subtitle2(AVCodecContext *avctx, AVSubtitle *sub,
3609 * Frees all allocated data in the given subtitle struct.
3611 * @param sub AVSubtitle to free.
3613 void avsubtitle_free(AVSubtitle *sub);
3615 int avcodec_parse_frame(AVCodecContext *avctx, uint8_t **pdata,
3617 uint8_t *buf, int buf_size);
3620 * Encode an audio frame from samples into buf.
3622 * @note The output buffer should be at least FF_MIN_BUFFER_SIZE bytes large.
3623 * However, for PCM audio the user will know how much space is needed
3624 * because it depends on the value passed in buf_size as described
3625 * below. In that case a lower value can be used.
3627 * @param avctx the codec context
3628 * @param[out] buf the output buffer
3629 * @param[in] buf_size the output buffer size
3630 * @param[in] samples the input buffer containing the samples
3631 * The number of samples read from this buffer is frame_size*channels,
3632 * both of which are defined in avctx.
3633 * For PCM audio the number of samples read from samples is equal to
3634 * buf_size * input_sample_size / output_sample_size.
3635 * @return On error a negative value is returned, on success zero or the number
3636 * of bytes used to encode the data read from the input buffer.
3638 int avcodec_encode_audio(AVCodecContext *avctx, uint8_t *buf, int buf_size,
3639 const short *samples);
3642 * Encode a video frame from pict into buf.
3643 * The input picture should be
3644 * stored using a specific format, namely avctx.pix_fmt.
3646 * @param avctx the codec context
3647 * @param[out] buf the output buffer for the bitstream of encoded frame
3648 * @param[in] buf_size the size of the output buffer in bytes
3649 * @param[in] pict the input picture to encode
3650 * @return On error a negative value is returned, on success zero or the number
3651 * of bytes used from the output buffer.
3653 int avcodec_encode_video(AVCodecContext *avctx, uint8_t *buf, int buf_size,
3654 const AVFrame *pict);
3655 int avcodec_encode_subtitle(AVCodecContext *avctx, uint8_t *buf, int buf_size,
3656 const AVSubtitle *sub);
3658 int avcodec_close(AVCodecContext *avctx);
3661 * Register all the codecs, parsers and bitstream filters which were enabled at
3662 * configuration time. If you do not call this function you can select exactly
3663 * which formats you want to support, by using the individual registration
3666 * @see avcodec_register
3667 * @see av_register_codec_parser
3668 * @see av_register_bitstream_filter
3670 void avcodec_register_all(void);
3673 * Flush buffers, should be called when seeking or when switching to a different stream.
3675 void avcodec_flush_buffers(AVCodecContext *avctx);
3677 void avcodec_default_free_buffers(AVCodecContext *s);
3679 /* misc useful functions */
3682 * Return a single letter to describe the given picture type pict_type.
3684 * @param[in] pict_type the picture type
3685 * @return A single character representing the picture type.
3687 char av_get_pict_type_char(int pict_type);
3690 * Return codec bits per sample.
3692 * @param[in] codec_id the codec
3693 * @return Number of bits per sample or zero if unknown for the given codec.
3695 int av_get_bits_per_sample(enum CodecID codec_id);
3698 * Return sample format bits per sample.
3700 * @param[in] sample_fmt the sample format
3701 * @return Number of bits per sample or zero if unknown for the given sample format.
3703 int av_get_bits_per_sample_format(enum SampleFormat sample_fmt);
3706 typedef struct AVCodecParserContext {
3708 struct AVCodecParser *parser;
3709 int64_t frame_offset; /* offset of the current frame */
3710 int64_t cur_offset; /* current offset
3711 (incremented by each av_parser_parse()) */
3712 int64_t next_frame_offset; /* offset of the next frame */
3714 int pict_type; /* XXX: Put it back in AVCodecContext. */
3716 * This field is used for proper frame duration computation in lavf.
3717 * It signals, how much longer the frame duration of the current frame
3718 * is compared to normal frame duration.
3720 * frame_duration = (1 + repeat_pict) * time_base
3722 * It is used by codecs like H.264 to display telecined material.
3724 int repeat_pict; /* XXX: Put it back in AVCodecContext. */
3725 int64_t pts; /* pts of the current frame */
3726 int64_t dts; /* dts of the current frame */
3731 int fetch_timestamp;
3733 #define AV_PARSER_PTS_NB 4
3734 int cur_frame_start_index;
3735 int64_t cur_frame_offset[AV_PARSER_PTS_NB];
3736 int64_t cur_frame_pts[AV_PARSER_PTS_NB];
3737 int64_t cur_frame_dts[AV_PARSER_PTS_NB];
3740 #define PARSER_FLAG_COMPLETE_FRAMES 0x0001
3741 #define PARSER_FLAG_ONCE 0x0002
3743 int64_t offset; ///< byte offset from starting packet start
3744 int64_t cur_frame_end[AV_PARSER_PTS_NB];
3747 * Set by parser to 1 for key frames and 0 for non-key frames.
3748 * It is initialized to -1, so if the parser doesn't set this flag,
3749 * old-style fallback using FF_I_TYPE picture type as key frames
3755 * Time difference in stream time base units from the pts of this
3756 * packet to the point at which the output from the decoder has converged
3757 * independent from the availability of previous frames. That is, the
3758 * frames are virtually identical no matter if decoding started from
3759 * the very first frame or from this keyframe.
3760 * Is AV_NOPTS_VALUE if unknown.
3761 * This field is not the display duration of the current frame.
3762 * This field has no meaning if the packet does not have AV_PKT_FLAG_KEY
3765 * The purpose of this field is to allow seeking in streams that have no
3766 * keyframes in the conventional sense. It corresponds to the
3767 * recovery point SEI in H.264 and match_time_delta in NUT. It is also
3768 * essential for some types of subtitle streams to ensure that all
3769 * subtitles are correctly displayed after seeking.
3771 int64_t convergence_duration;
3773 // Timestamp generation support:
3775 * Synchronization point for start of timestamp generation.
3777 * Set to >0 for sync point, 0 for no sync point and <0 for undefined
3780 * For example, this corresponds to presence of H.264 buffering period
3786 * Offset of the current timestamp against last timestamp sync point in
3787 * units of AVCodecContext.time_base.
3789 * Set to INT_MIN when dts_sync_point unused. Otherwise, it must
3790 * contain a valid timestamp offset.
3792 * Note that the timestamp of sync point has usually a nonzero
3793 * dts_ref_dts_delta, which refers to the previous sync point. Offset of
3794 * the next frame after timestamp sync point will be usually 1.
3796 * For example, this corresponds to H.264 cpb_removal_delay.
3798 int dts_ref_dts_delta;
3801 * Presentation delay of current frame in units of AVCodecContext.time_base.
3803 * Set to INT_MIN when dts_sync_point unused. Otherwise, it must
3804 * contain valid non-negative timestamp delta (presentation time of a frame
3805 * must not lie in the past).
3807 * This delay represents the difference between decoding and presentation
3808 * time of the frame.
3810 * For example, this corresponds to H.264 dpb_output_delay.
3815 * Position of the packet in file.
3817 * Analogous to cur_frame_pts/dts
3819 int64_t cur_frame_pos[AV_PARSER_PTS_NB];
3822 * Byte position of currently parsed frame in stream.
3827 * Previous frame byte position.
3830 } AVCodecParserContext;
3832 typedef struct AVCodecParser {
3833 int codec_ids[5]; /* several codec IDs are permitted */
3835 int (*parser_init)(AVCodecParserContext *s);
3836 int (*parser_parse)(AVCodecParserContext *s,
3837 AVCodecContext *avctx,
3838 const uint8_t **poutbuf, int *poutbuf_size,
3839 const uint8_t *buf, int buf_size);
3840 void (*parser_close)(AVCodecParserContext *s);
3841 int (*split)(AVCodecContext *avctx, const uint8_t *buf, int buf_size);
3842 struct AVCodecParser *next;
3845 AVCodecParser *av_parser_next(AVCodecParser *c);
3847 void av_register_codec_parser(AVCodecParser *parser);
3848 AVCodecParserContext *av_parser_init(int codec_id);
3850 #if LIBAVCODEC_VERSION_MAJOR < 53
3851 attribute_deprecated
3852 int av_parser_parse(AVCodecParserContext *s,
3853 AVCodecContext *avctx,
3854 uint8_t **poutbuf, int *poutbuf_size,
3855 const uint8_t *buf, int buf_size,
3856 int64_t pts, int64_t dts);
3862 * @param s parser context.
3863 * @param avctx codec context.
3864 * @param poutbuf set to pointer to parsed buffer or NULL if not yet finished.
3865 * @param poutbuf_size set to size of parsed buffer or zero if not yet finished.
3866 * @param buf input buffer.
3867 * @param buf_size input length, to signal EOF, this should be 0 (so that the last frame can be output).
3868 * @param pts input presentation timestamp.
3869 * @param dts input decoding timestamp.
3870 * @param pos input byte position in stream.
3871 * @return the number of bytes of the input bitstream used.
3876 * len = av_parser_parse2(myparser, AVCodecContext, &data, &size,
3883 * decode_frame(data, size);
3887 int av_parser_parse2(AVCodecParserContext *s,
3888 AVCodecContext *avctx,
3889 uint8_t **poutbuf, int *poutbuf_size,
3890 const uint8_t *buf, int buf_size,
3891 int64_t pts, int64_t dts,
3894 int av_parser_change(AVCodecParserContext *s,
3895 AVCodecContext *avctx,
3896 uint8_t **poutbuf, int *poutbuf_size,
3897 const uint8_t *buf, int buf_size, int keyframe);
3898 void av_parser_close(AVCodecParserContext *s);
3901 typedef struct AVBitStreamFilterContext {
3903 struct AVBitStreamFilter *filter;
3904 AVCodecParserContext *parser;
3905 struct AVBitStreamFilterContext *next;
3906 } AVBitStreamFilterContext;
3909 typedef struct AVBitStreamFilter {
3912 int (*filter)(AVBitStreamFilterContext *bsfc,
3913 AVCodecContext *avctx, const char *args,
3914 uint8_t **poutbuf, int *poutbuf_size,
3915 const uint8_t *buf, int buf_size, int keyframe);
3916 void (*close)(AVBitStreamFilterContext *bsfc);
3917 struct AVBitStreamFilter *next;
3918 } AVBitStreamFilter;
3920 void av_register_bitstream_filter(AVBitStreamFilter *bsf);
3921 AVBitStreamFilterContext *av_bitstream_filter_init(const char *name);
3922 int av_bitstream_filter_filter(AVBitStreamFilterContext *bsfc,
3923 AVCodecContext *avctx, const char *args,
3924 uint8_t **poutbuf, int *poutbuf_size,
3925 const uint8_t *buf, int buf_size, int keyframe);
3926 void av_bitstream_filter_close(AVBitStreamFilterContext *bsf);
3928 AVBitStreamFilter *av_bitstream_filter_next(AVBitStreamFilter *f);
3933 * Reallocate the given block if it is not large enough, otherwise do nothing.
3937 void *av_fast_realloc(void *ptr, unsigned int *size, unsigned int min_size);
3940 * Allocate a buffer, reusing the given one if large enough.
3942 * Contrary to av_fast_realloc the current buffer contents might not be
3943 * preserved and on error the old buffer is freed, thus no special
3944 * handling to avoid memleaks is necessary.
3946 * @param ptr pointer to pointer to already allocated buffer, overwritten with pointer to new buffer
3947 * @param size size of the buffer *ptr points to
3948 * @param min_size minimum size of *ptr buffer after returning, *ptr will be NULL and
3949 * *size 0 if an error occurred.
3951 void av_fast_malloc(void *ptr, unsigned int *size, unsigned int min_size);
3953 #if LIBAVCODEC_VERSION_MAJOR < 53
3955 * @deprecated Deprecated in favor of av_image_copy().
3957 attribute_deprecated
3958 void av_picture_data_copy(uint8_t *dst_data[4], int dst_linesize[4],
3959 uint8_t *src_data[4], int src_linesize[4],
3960 enum PixelFormat pix_fmt, int width, int height);
3964 * Copy image src to dst. Wraps av_picture_data_copy() above.
3966 void av_picture_copy(AVPicture *dst, const AVPicture *src,
3967 enum PixelFormat pix_fmt, int width, int height);
3970 * Crop image top and left side.
3972 int av_picture_crop(AVPicture *dst, const AVPicture *src,
3973 enum PixelFormat pix_fmt, int top_band, int left_band);
3978 int av_picture_pad(AVPicture *dst, const AVPicture *src, int height, int width, enum PixelFormat pix_fmt,
3979 int padtop, int padbottom, int padleft, int padright, int *color);
3982 * Encode extradata length to a buffer. Used by xiph codecs.
3984 * @param s buffer to write to; must be at least (v/255+1) bytes long
3985 * @param v size of extradata in bytes
3986 * @return number of bytes written to the buffer.
3988 unsigned int av_xiphlacing(unsigned char *s, unsigned int v);
3990 #if LIBAVCODEC_VERSION_MAJOR < 53
3992 * Parse str and put in width_ptr and height_ptr the detected values.
3994 * @deprecated Deprecated in favor of av_parse_video_size().
3996 attribute_deprecated int av_parse_video_frame_size(int *width_ptr, int *height_ptr, const char *str);
3999 * Parse str and store the detected values in *frame_rate.
4001 * @deprecated Deprecated in favor of av_parse_video_rate().
4003 attribute_deprecated int av_parse_video_frame_rate(AVRational *frame_rate, const char *str);
4007 * Logs a generic warning message about a missing feature. This function is
4008 * intended to be used internally by FFmpeg (libavcodec, libavformat, etc.)
4009 * only, and would normally not be used by applications.
4010 * @param[in] avc a pointer to an arbitrary struct of which the first field is
4011 * a pointer to an AVClass struct
4012 * @param[in] feature string containing the name of the missing feature
4013 * @param[in] want_sample indicates if samples are wanted which exhibit this feature.
4014 * If want_sample is non-zero, additional verbage will be added to the log
4015 * message which tells the user how to report samples to the development
4018 void av_log_missing_feature(void *avc, const char *feature, int want_sample);
4021 * Log a generic warning message asking for a sample. This function is
4022 * intended to be used internally by FFmpeg (libavcodec, libavformat, etc.)
4023 * only, and would normally not be used by applications.
4024 * @param[in] avc a pointer to an arbitrary struct of which the first field is
4025 * a pointer to an AVClass struct
4026 * @param[in] msg string containing an optional message, or NULL if no message
4028 void av_log_ask_for_sample(void *avc, const char *msg);
4031 * Register the hardware accelerator hwaccel.
4033 void av_register_hwaccel(AVHWAccel *hwaccel);
4036 * If hwaccel is NULL, returns the first registered hardware accelerator,
4037 * if hwaccel is non-NULL, returns the next registered hardware accelerator
4038 * after hwaccel, or NULL if hwaccel is the last one.
4040 AVHWAccel *av_hwaccel_next(AVHWAccel *hwaccel);
4044 * Lock operation used by lockmgr
4047 AV_LOCK_CREATE, ///< Create a mutex
4048 AV_LOCK_OBTAIN, ///< Lock the mutex
4049 AV_LOCK_RELEASE, ///< Unlock the mutex
4050 AV_LOCK_DESTROY, ///< Free mutex resources
4054 * Register a user provided lock manager supporting the operations
4055 * specified by AVLockOp. mutex points to a (void *) where the
4056 * lockmgr should store/get a pointer to a user allocated mutex. It's
4057 * NULL upon AV_LOCK_CREATE and != NULL for all other ops.
4059 * @param cb User defined callback. Note: FFmpeg may invoke calls to this
4060 * callback during the call to av_lockmgr_register().
4061 * Thus, the application must be prepared to handle that.
4062 * If cb is set to NULL the lockmgr will be unregistered.
4063 * Also note that during unregistration the previously registered
4064 * lockmgr callback may also be invoked.
4066 int av_lockmgr_register(int (*cb)(void **mutex, enum AVLockOp op));
4068 #endif /* AVCODEC_AVCODEC_H */