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/samplefmt.h"
31 #include "libavutil/avutil.h"
32 #include "libavutil/cpu.h"
33 #include "libavutil/dict.h"
34 #include "libavutil/log.h"
35 #include "libavutil/pixfmt.h"
36 #include "libavutil/rational.h"
38 #include "libavcodec/version.h"
41 * Identify the syntax and semantics of the bitstream.
42 * The principle is roughly:
43 * Two decoders with the same ID can decode the same streams.
44 * Two encoders with the same ID can encode compatible streams.
45 * There may be slight deviations from the principle due to implementation
48 * If you add a codec ID to this list, add it so that
49 * 1. no value of a existing codec ID changes (that would break ABI),
50 * 2. it is as close as possible to similar codecs.
57 CODEC_ID_MPEG2VIDEO, ///< preferred ID for MPEG-1/2 video decoding
58 CODEC_ID_MPEG2VIDEO_XVMC,
95 CODEC_ID_INTERPLAY_VIDEO,
107 CODEC_ID_TRUEMOTION1,
134 CODEC_ID_TRUEMOTION2,
151 CODEC_ID_DSICINVIDEO,
152 CODEC_ID_TIERTEXSEQVIDEO,
161 CODEC_ID_BETHSOFTVID,
179 CODEC_ID_MOTIONPIXELS,
197 CODEC_ID_IFF_BYTERUN1,
216 /* various PCM "codecs" */
217 CODEC_ID_FIRST_AUDIO = 0x10000, ///< A dummy id pointing at the start of audio codecs
218 CODEC_ID_PCM_S16LE= 0x10000,
234 CODEC_ID_PCM_S24DAUD,
236 CODEC_ID_PCM_S16LE_PLANAR,
246 /* various ADPCM codecs */
247 CODEC_ID_ADPCM_IMA_QT= 0x11000,
248 CODEC_ID_ADPCM_IMA_WAV,
249 CODEC_ID_ADPCM_IMA_DK3,
250 CODEC_ID_ADPCM_IMA_DK4,
251 CODEC_ID_ADPCM_IMA_WS,
252 CODEC_ID_ADPCM_IMA_SMJPEG,
261 CODEC_ID_ADPCM_YAMAHA,
262 CODEC_ID_ADPCM_SBPRO_4,
263 CODEC_ID_ADPCM_SBPRO_3,
264 CODEC_ID_ADPCM_SBPRO_2,
266 CODEC_ID_ADPCM_IMA_AMV,
267 CODEC_ID_ADPCM_EA_R1,
268 CODEC_ID_ADPCM_EA_R3,
269 CODEC_ID_ADPCM_EA_R2,
270 CODEC_ID_ADPCM_IMA_EA_SEAD,
271 CODEC_ID_ADPCM_IMA_EA_EACS,
272 CODEC_ID_ADPCM_EA_XAS,
273 CODEC_ID_ADPCM_EA_MAXIS_XA,
274 CODEC_ID_ADPCM_IMA_ISS,
278 CODEC_ID_AMR_NB= 0x12000,
281 /* RealAudio codecs*/
282 CODEC_ID_RA_144= 0x13000,
285 /* various DPCM codecs */
286 CODEC_ID_ROQ_DPCM= 0x14000,
287 CODEC_ID_INTERPLAY_DPCM,
292 CODEC_ID_MP2= 0x15000,
293 CODEC_ID_MP3, ///< preferred ID for decoding MPEG audio layer 1, 2 or 3
311 CODEC_ID_WESTWOOD_SND1,
312 CODEC_ID_GSM, ///< as in Berlin toast format
320 CODEC_ID_DSICINAUDIO,
324 CODEC_ID_GSM_MS, /* as found in WAV */
333 CODEC_ID_WMALOSSLESS,
342 CODEC_ID_BINKAUDIO_RDFT,
343 CODEC_ID_BINKAUDIO_DCT,
348 /* subtitle codecs */
349 CODEC_ID_FIRST_SUBTITLE = 0x17000, ///< A dummy ID pointing at the start of subtitle codecs.
350 CODEC_ID_DVD_SUBTITLE= 0x17000,
351 CODEC_ID_DVB_SUBTITLE,
352 CODEC_ID_TEXT, ///< raw UTF-8 text
356 CODEC_ID_HDMV_PGS_SUBTITLE,
357 CODEC_ID_DVB_TELETEXT,
361 /* other specific kind of codecs (generally used for attachments) */
362 CODEC_ID_FIRST_UNKNOWN = 0x18000, ///< A dummy ID pointing at the start of various fake codecs.
363 CODEC_ID_TTF= 0x18000,
365 CODEC_ID_PROBE= 0x19000, ///< codec_id is not known (like CODEC_ID_NONE) but lavf should attempt to identify it
367 CODEC_ID_MPEG2TS= 0x20000, /**< _FAKE_ codec to indicate a raw MPEG-2 TS
368 * stream (only used by libavformat) */
369 CODEC_ID_FFMETADATA=0x21000, ///< Dummy codec for streams containing only metadata information.
372 #if FF_API_OLD_SAMPLE_FMT
373 #define SampleFormat AVSampleFormat
375 #define SAMPLE_FMT_NONE AV_SAMPLE_FMT_NONE
376 #define SAMPLE_FMT_U8 AV_SAMPLE_FMT_U8
377 #define SAMPLE_FMT_S16 AV_SAMPLE_FMT_S16
378 #define SAMPLE_FMT_S32 AV_SAMPLE_FMT_S32
379 #define SAMPLE_FMT_FLT AV_SAMPLE_FMT_FLT
380 #define SAMPLE_FMT_DBL AV_SAMPLE_FMT_DBL
381 #define SAMPLE_FMT_NB AV_SAMPLE_FMT_NB
384 #if FF_API_OLD_AUDIOCONVERT
385 #include "libavutil/audioconvert.h"
387 /* Audio channel masks */
388 #define CH_FRONT_LEFT AV_CH_FRONT_LEFT
389 #define CH_FRONT_RIGHT AV_CH_FRONT_RIGHT
390 #define CH_FRONT_CENTER AV_CH_FRONT_CENTER
391 #define CH_LOW_FREQUENCY AV_CH_LOW_FREQUENCY
392 #define CH_BACK_LEFT AV_CH_BACK_LEFT
393 #define CH_BACK_RIGHT AV_CH_BACK_RIGHT
394 #define CH_FRONT_LEFT_OF_CENTER AV_CH_FRONT_LEFT_OF_CENTER
395 #define CH_FRONT_RIGHT_OF_CENTER AV_CH_FRONT_RIGHT_OF_CENTER
396 #define CH_BACK_CENTER AV_CH_BACK_CENTER
397 #define CH_SIDE_LEFT AV_CH_SIDE_LEFT
398 #define CH_SIDE_RIGHT AV_CH_SIDE_RIGHT
399 #define CH_TOP_CENTER AV_CH_TOP_CENTER
400 #define CH_TOP_FRONT_LEFT AV_CH_TOP_FRONT_LEFT
401 #define CH_TOP_FRONT_CENTER AV_CH_TOP_FRONT_CENTER
402 #define CH_TOP_FRONT_RIGHT AV_CH_TOP_FRONT_RIGHT
403 #define CH_TOP_BACK_LEFT AV_CH_TOP_BACK_LEFT
404 #define CH_TOP_BACK_CENTER AV_CH_TOP_BACK_CENTER
405 #define CH_TOP_BACK_RIGHT AV_CH_TOP_BACK_RIGHT
406 #define CH_STEREO_LEFT AV_CH_STEREO_LEFT
407 #define CH_STEREO_RIGHT AV_CH_STEREO_RIGHT
409 /** Channel mask value used for AVCodecContext.request_channel_layout
410 to indicate that the user requests the channel order of the decoder output
411 to be the native codec channel order. */
412 #define CH_LAYOUT_NATIVE AV_CH_LAYOUT_NATIVE
414 /* Audio channel convenience macros */
415 #define CH_LAYOUT_MONO AV_CH_LAYOUT_MONO
416 #define CH_LAYOUT_STEREO AV_CH_LAYOUT_STEREO
417 #define CH_LAYOUT_2_1 AV_CH_LAYOUT_2_1
418 #define CH_LAYOUT_SURROUND AV_CH_LAYOUT_SURROUND
419 #define CH_LAYOUT_4POINT0 AV_CH_LAYOUT_4POINT0
420 #define CH_LAYOUT_2_2 AV_CH_LAYOUT_2_2
421 #define CH_LAYOUT_QUAD AV_CH_LAYOUT_QUAD
422 #define CH_LAYOUT_5POINT0 AV_CH_LAYOUT_5POINT0
423 #define CH_LAYOUT_5POINT1 AV_CH_LAYOUT_5POINT1
424 #define CH_LAYOUT_5POINT0_BACK AV_CH_LAYOUT_5POINT0_BACK
425 #define CH_LAYOUT_5POINT1_BACK AV_CH_LAYOUT_5POINT1_BACK
426 #define CH_LAYOUT_7POINT0 AV_CH_LAYOUT_7POINT0
427 #define CH_LAYOUT_7POINT1 AV_CH_LAYOUT_7POINT1
428 #define CH_LAYOUT_7POINT1_WIDE AV_CH_LAYOUT_7POINT1_WIDE
429 #define CH_LAYOUT_STEREO_DOWNMIX AV_CH_LAYOUT_STEREO_DOWNMIX
433 #define AVCODEC_MAX_AUDIO_FRAME_SIZE 192000 // 1 second of 48khz 32bit audio
436 * Required number of additionally allocated bytes at the end of the input bitstream for decoding.
437 * This is mainly needed because some optimized bitstream readers read
438 * 32 or 64 bit at once and could read over the end.<br>
439 * Note: If the first 23 bits of the additional bytes are not 0, then damaged
440 * MPEG bitstreams could cause overread and segfault.
442 #define FF_INPUT_BUFFER_PADDING_SIZE 16
445 * minimum encoding buffer size
446 * Used to avoid some checks during header writing.
448 #define FF_MIN_BUFFER_SIZE 16384
452 * motion estimation type.
455 ME_ZERO = 1, ///< no search, that is use 0,0 vector whenever one is needed
459 ME_EPZS, ///< enhanced predictive zonal search
460 ME_X1, ///< reserved for experiments
461 ME_HEX, ///< hexagon based search
462 ME_UMH, ///< uneven multi-hexagon search
463 ME_ITER, ///< iterative search
464 ME_TESA, ///< transformed exhaustive search algorithm
468 /* We leave some space between them for extensions (drop some
469 * keyframes for intra-only or drop just some bidir frames). */
470 AVDISCARD_NONE =-16, ///< discard nothing
471 AVDISCARD_DEFAULT= 0, ///< discard useless packets like 0 size packets in avi
472 AVDISCARD_NONREF = 8, ///< discard all non reference
473 AVDISCARD_BIDIR = 16, ///< discard all bidirectional frames
474 AVDISCARD_NONKEY = 32, ///< discard all frames except keyframes
475 AVDISCARD_ALL = 48, ///< discard all
478 enum AVColorPrimaries{
479 AVCOL_PRI_BT709 =1, ///< also ITU-R BT1361 / IEC 61966-2-4 / SMPTE RP177 Annex B
480 AVCOL_PRI_UNSPECIFIED=2,
482 AVCOL_PRI_BT470BG =5, ///< also ITU-R BT601-6 625 / ITU-R BT1358 625 / ITU-R BT1700 625 PAL & SECAM
483 AVCOL_PRI_SMPTE170M =6, ///< also ITU-R BT601-6 525 / ITU-R BT1358 525 / ITU-R BT1700 NTSC
484 AVCOL_PRI_SMPTE240M =7, ///< functionally identical to above
486 AVCOL_PRI_NB , ///< Not part of ABI
489 enum AVColorTransferCharacteristic{
490 AVCOL_TRC_BT709 =1, ///< also ITU-R BT1361
491 AVCOL_TRC_UNSPECIFIED=2,
492 AVCOL_TRC_GAMMA22 =4, ///< also ITU-R BT470M / ITU-R BT1700 625 PAL & SECAM
493 AVCOL_TRC_GAMMA28 =5, ///< also ITU-R BT470BG
494 AVCOL_TRC_NB , ///< Not part of ABI
499 AVCOL_SPC_BT709 =1, ///< also ITU-R BT1361 / IEC 61966-2-4 xvYCC709 / SMPTE RP177 Annex B
500 AVCOL_SPC_UNSPECIFIED=2,
502 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
503 AVCOL_SPC_SMPTE170M =6, ///< also ITU-R BT601-6 525 / ITU-R BT1358 525 / ITU-R BT1700 NTSC / functionally identical to above
504 AVCOL_SPC_SMPTE240M =7,
505 AVCOL_SPC_NB , ///< Not part of ABI
509 AVCOL_RANGE_UNSPECIFIED=0,
510 AVCOL_RANGE_MPEG =1, ///< the normal 219*2^(n-8) "MPEG" YUV ranges
511 AVCOL_RANGE_JPEG =2, ///< the normal 2^n-1 "JPEG" YUV ranges
512 AVCOL_RANGE_NB , ///< Not part of ABI
516 * X X 3 4 X X are luma samples,
517 * 1 2 1-6 are possible chroma positions
518 * X X 5 6 X 0 is undefined/unknown position
520 enum AVChromaLocation{
521 AVCHROMA_LOC_UNSPECIFIED=0,
522 AVCHROMA_LOC_LEFT =1, ///< mpeg2/4, h264 default
523 AVCHROMA_LOC_CENTER =2, ///< mpeg1, jpeg, h263
524 AVCHROMA_LOC_TOPLEFT =3, ///< DV
526 AVCHROMA_LOC_BOTTOMLEFT =5,
527 AVCHROMA_LOC_BOTTOM =6,
528 AVCHROMA_LOC_NB , ///< Not part of ABI
531 #if FF_API_FLAC_GLOBAL_OPTS
535 attribute_deprecated enum AVLPCType {
536 AV_LPC_TYPE_DEFAULT = -1, ///< use the codec default LPC type
537 AV_LPC_TYPE_NONE = 0, ///< do not use LPC prediction or use all zero coefficients
538 AV_LPC_TYPE_FIXED = 1, ///< fixed LPC coefficients
539 AV_LPC_TYPE_LEVINSON = 2, ///< Levinson-Durbin recursion
540 AV_LPC_TYPE_CHOLESKY = 3, ///< Cholesky factorization
541 AV_LPC_TYPE_NB , ///< Not part of ABI
545 enum AVAudioServiceType {
546 AV_AUDIO_SERVICE_TYPE_MAIN = 0,
547 AV_AUDIO_SERVICE_TYPE_EFFECTS = 1,
548 AV_AUDIO_SERVICE_TYPE_VISUALLY_IMPAIRED = 2,
549 AV_AUDIO_SERVICE_TYPE_HEARING_IMPAIRED = 3,
550 AV_AUDIO_SERVICE_TYPE_DIALOGUE = 4,
551 AV_AUDIO_SERVICE_TYPE_COMMENTARY = 5,
552 AV_AUDIO_SERVICE_TYPE_EMERGENCY = 6,
553 AV_AUDIO_SERVICE_TYPE_VOICE_OVER = 7,
554 AV_AUDIO_SERVICE_TYPE_KARAOKE = 8,
555 AV_AUDIO_SERVICE_TYPE_NB , ///< Not part of ABI
558 typedef struct RcOverride{
561 int qscale; // If this is 0 then quality_factor will be used instead.
562 float quality_factor;
565 #define FF_MAX_B_FRAMES 16
568 These flags can be passed in AVCodecContext.flags before initialization.
569 Note: Not everything is supported yet.
572 #define CODEC_FLAG_QSCALE 0x0002 ///< Use fixed qscale.
573 #define CODEC_FLAG_4MV 0x0004 ///< 4 MV per MB allowed / advanced prediction for H.263.
574 #define CODEC_FLAG_QPEL 0x0010 ///< Use qpel MC.
575 #define CODEC_FLAG_GMC 0x0020 ///< Use GMC.
576 #define CODEC_FLAG_MV0 0x0040 ///< Always try a MB with MV=<0,0>.
577 #define CODEC_FLAG_PART 0x0080 ///< Use data partitioning.
579 * The parent program guarantees that the input for B-frames containing
580 * streams is not written to for at least s->max_b_frames+1 frames, if
581 * this is not set the input will be copied.
583 #define CODEC_FLAG_INPUT_PRESERVED 0x0100
584 #define CODEC_FLAG_PASS1 0x0200 ///< Use internal 2pass ratecontrol in first pass mode.
585 #define CODEC_FLAG_PASS2 0x0400 ///< Use internal 2pass ratecontrol in second pass mode.
586 #define CODEC_FLAG_EXTERN_HUFF 0x1000 ///< Use external Huffman table (for MJPEG).
587 #define CODEC_FLAG_GRAY 0x2000 ///< Only decode/encode grayscale.
588 #define CODEC_FLAG_EMU_EDGE 0x4000 ///< Don't draw edges.
589 #define CODEC_FLAG_PSNR 0x8000 ///< error[?] variables will be set during encoding.
590 #define CODEC_FLAG_TRUNCATED 0x00010000 /** Input bitstream might be truncated at a random
591 location instead of only at frame boundaries. */
592 #define CODEC_FLAG_NORMALIZE_AQP 0x00020000 ///< Normalize adaptive quantization.
593 #define CODEC_FLAG_INTERLACED_DCT 0x00040000 ///< Use interlaced DCT.
594 #define CODEC_FLAG_LOW_DELAY 0x00080000 ///< Force low delay.
595 #define CODEC_FLAG_ALT_SCAN 0x00100000 ///< Use alternate scan.
596 #define CODEC_FLAG_GLOBAL_HEADER 0x00400000 ///< Place global headers in extradata instead of every keyframe.
597 #define CODEC_FLAG_BITEXACT 0x00800000 ///< Use only bitexact stuff (except (I)DCT).
598 /* Fx : Flag for h263+ extra options */
599 #define CODEC_FLAG_AC_PRED 0x01000000 ///< H.263 advanced intra coding / MPEG-4 AC prediction
600 #define CODEC_FLAG_H263P_UMV 0x02000000 ///< unlimited motion vector
601 #define CODEC_FLAG_CBP_RD 0x04000000 ///< Use rate distortion optimization for cbp.
602 #define CODEC_FLAG_QP_RD 0x08000000 ///< Use rate distortion optimization for qp selectioon.
603 #define CODEC_FLAG_H263P_AIV 0x00000008 ///< H.263 alternative inter VLC
604 #define CODEC_FLAG_OBMC 0x00000001 ///< OBMC
605 #define CODEC_FLAG_LOOP_FILTER 0x00000800 ///< loop filter
606 #define CODEC_FLAG_H263P_SLICE_STRUCT 0x10000000
607 #define CODEC_FLAG_INTERLACED_ME 0x20000000 ///< interlaced motion estimation
608 #define CODEC_FLAG_SVCD_SCAN_OFFSET 0x40000000 ///< Will reserve space for SVCD scan offset user data.
609 #define CODEC_FLAG_CLOSED_GOP 0x80000000
610 #define CODEC_FLAG2_FAST 0x00000001 ///< Allow non spec compliant speedup tricks.
611 #define CODEC_FLAG2_STRICT_GOP 0x00000002 ///< Strictly enforce GOP size.
612 #define CODEC_FLAG2_NO_OUTPUT 0x00000004 ///< Skip bitstream encoding.
613 #define CODEC_FLAG2_LOCAL_HEADER 0x00000008 ///< Place global headers at every keyframe instead of in extradata.
614 #define CODEC_FLAG2_BPYRAMID 0x00000010 ///< H.264 allow B-frames to be used as references.
615 #define CODEC_FLAG2_WPRED 0x00000020 ///< H.264 weighted biprediction for B-frames
616 #define CODEC_FLAG2_MIXED_REFS 0x00000040 ///< H.264 one reference per partition, as opposed to one reference per macroblock
617 #define CODEC_FLAG2_8X8DCT 0x00000080 ///< H.264 high profile 8x8 transform
618 #define CODEC_FLAG2_FASTPSKIP 0x00000100 ///< H.264 fast pskip
619 #define CODEC_FLAG2_AUD 0x00000200 ///< H.264 access unit delimiters
620 #define CODEC_FLAG2_BRDO 0x00000400 ///< B-frame rate-distortion optimization
621 #define CODEC_FLAG2_INTRA_VLC 0x00000800 ///< Use MPEG-2 intra VLC table.
622 #define CODEC_FLAG2_MEMC_ONLY 0x00001000 ///< Only do ME/MC (I frames -> ref, P frame -> ME+MC).
623 #define CODEC_FLAG2_DROP_FRAME_TIMECODE 0x00002000 ///< timecode is in drop frame format.
624 #define CODEC_FLAG2_SKIP_RD 0x00004000 ///< RD optimal MB level residual skipping
625 #define CODEC_FLAG2_CHUNKS 0x00008000 ///< Input bitstream might be truncated at a packet boundaries instead of only at frame boundaries.
626 #define CODEC_FLAG2_NON_LINEAR_QUANT 0x00010000 ///< Use MPEG-2 nonlinear quantizer.
627 #define CODEC_FLAG2_BIT_RESERVOIR 0x00020000 ///< Use a bit reservoir when encoding if possible
628 #define CODEC_FLAG2_MBTREE 0x00040000 ///< Use macroblock tree ratecontrol (x264 only)
629 #define CODEC_FLAG2_PSY 0x00080000 ///< Use psycho visual optimizations.
630 #define CODEC_FLAG2_SSIM 0x00100000 ///< Compute SSIM during encoding, error[] values are undefined.
631 #define CODEC_FLAG2_INTRA_REFRESH 0x00200000 ///< Use periodic insertion of intra blocks instead of keyframes.
633 /* Unsupported options :
634 * Syntax Arithmetic coding (SAC)
635 * Reference Picture Selection
636 * Independent Segment Decoding */
638 /* codec capabilities */
640 #define CODEC_CAP_DRAW_HORIZ_BAND 0x0001 ///< Decoder can use draw_horiz_band callback.
642 * Codec uses get_buffer() for allocating buffers and supports custom allocators.
643 * If not set, it might not use get_buffer() at all or use operations that
644 * assume the buffer was allocated by avcodec_default_get_buffer.
646 #define CODEC_CAP_DR1 0x0002
647 /* If 'parse_only' field is true, then avcodec_parse_frame() can be used. */
648 #define CODEC_CAP_PARSE_ONLY 0x0004
649 #define CODEC_CAP_TRUNCATED 0x0008
650 /* Codec can export data for HW decoding (XvMC). */
651 #define CODEC_CAP_HWACCEL 0x0010
653 * Codec has a nonzero delay and needs to be fed with NULL at the end to get the delayed data.
654 * If this is not set, the codec is guaranteed to never be fed with NULL data.
656 #define CODEC_CAP_DELAY 0x0020
658 * Codec can be fed a final frame with a smaller size.
659 * This can be used to prevent truncation of the last audio samples.
661 #define CODEC_CAP_SMALL_LAST_FRAME 0x0040
663 * Codec can export data for HW decoding (VDPAU).
665 #define CODEC_CAP_HWACCEL_VDPAU 0x0080
667 * Codec can output multiple frames per AVPacket
668 * Normally demuxers return one frame at a time, demuxers which do not do
669 * are connected to a parser to split what they return into proper frames.
670 * This flag is reserved to the very rare category of codecs which have a
671 * bitstream that cannot be split into frames without timeconsuming
672 * operations like full decoding. Demuxers carring such bitstreams thus
673 * may return multiple frames in a packet. This has many disadvantages like
674 * prohibiting stream copy in many cases thus it should only be considered
677 #define CODEC_CAP_SUBFRAMES 0x0100
679 * Codec is experimental and is thus avoided in favor of non experimental
682 #define CODEC_CAP_EXPERIMENTAL 0x0200
684 * Codec should fill in channel configuration and samplerate instead of container
686 #define CODEC_CAP_CHANNEL_CONF 0x0400
689 * Codec is able to deal with negative linesizes
691 #define CODEC_CAP_NEG_LINESIZES 0x0800
694 * Codec supports frame-level multithreading.
696 #define CODEC_CAP_FRAME_THREADS 0x1000
698 * Codec supports slice-based (or partition-based) multithreading.
700 #define CODEC_CAP_SLICE_THREADS 0x2000
704 #define CODEC_CAP_LOSSLESS 0x80000000
706 //The following defines may change, don't expect compatibility if you use them.
707 #define MB_TYPE_INTRA4x4 0x0001
708 #define MB_TYPE_INTRA16x16 0x0002 //FIXME H.264-specific
709 #define MB_TYPE_INTRA_PCM 0x0004 //FIXME H.264-specific
710 #define MB_TYPE_16x16 0x0008
711 #define MB_TYPE_16x8 0x0010
712 #define MB_TYPE_8x16 0x0020
713 #define MB_TYPE_8x8 0x0040
714 #define MB_TYPE_INTERLACED 0x0080
715 #define MB_TYPE_DIRECT2 0x0100 //FIXME
716 #define MB_TYPE_ACPRED 0x0200
717 #define MB_TYPE_GMC 0x0400
718 #define MB_TYPE_SKIP 0x0800
719 #define MB_TYPE_P0L0 0x1000
720 #define MB_TYPE_P1L0 0x2000
721 #define MB_TYPE_P0L1 0x4000
722 #define MB_TYPE_P1L1 0x8000
723 #define MB_TYPE_L0 (MB_TYPE_P0L0 | MB_TYPE_P1L0)
724 #define MB_TYPE_L1 (MB_TYPE_P0L1 | MB_TYPE_P1L1)
725 #define MB_TYPE_L0L1 (MB_TYPE_L0 | MB_TYPE_L1)
726 #define MB_TYPE_QUANT 0x00010000
727 #define MB_TYPE_CBP 0x00020000
728 //Note bits 24-31 are reserved for codec specific use (h264 ref0, mpeg1 0mv, ...)
732 * This specifies the area which should be displayed.
733 * Note there may be multiple such areas for one frame.
735 typedef struct AVPanScan{
738 * - encoding: Set by user.
739 * - decoding: Set by libavcodec.
744 * width and height in 1/16 pel
745 * - encoding: Set by user.
746 * - decoding: Set by libavcodec.
752 * position of the top left corner in 1/16 pel for up to 3 fields/frames
753 * - encoding: Set by user.
754 * - decoding: Set by libavcodec.
756 int16_t position[3][2];
759 #define FF_QSCALE_TYPE_MPEG1 0
760 #define FF_QSCALE_TYPE_MPEG2 1
761 #define FF_QSCALE_TYPE_H264 2
762 #define FF_QSCALE_TYPE_VP56 3
764 #define FF_BUFFER_TYPE_INTERNAL 1
765 #define FF_BUFFER_TYPE_USER 2 ///< direct rendering buffers (image is (de)allocated by user)
766 #define FF_BUFFER_TYPE_SHARED 4 ///< Buffer from somewhere else; don't deallocate image (data/base), all other tables are not shared.
767 #define FF_BUFFER_TYPE_COPY 8 ///< Just a (modified) copy of some other buffer, don't deallocate anything.
769 #if FF_API_OLD_FF_PICT_TYPES
770 /* DEPRECATED, directly use the AV_PICTURE_TYPE_* enum values */
771 #define FF_I_TYPE AV_PICTURE_TYPE_I ///< Intra
772 #define FF_P_TYPE AV_PICTURE_TYPE_P ///< Predicted
773 #define FF_B_TYPE AV_PICTURE_TYPE_B ///< Bi-dir predicted
774 #define FF_S_TYPE AV_PICTURE_TYPE_S ///< S(GMC)-VOP MPEG4
775 #define FF_SI_TYPE AV_PICTURE_TYPE_SI ///< Switching Intra
776 #define FF_SP_TYPE AV_PICTURE_TYPE_SP ///< Switching Predicted
777 #define FF_BI_TYPE AV_PICTURE_TYPE_BI
780 #define FF_BUFFER_HINTS_VALID 0x01 // Buffer hints value is meaningful (if 0 ignore).
781 #define FF_BUFFER_HINTS_READABLE 0x02 // Codec will read from buffer.
782 #define FF_BUFFER_HINTS_PRESERVE 0x04 // User must not alter buffer content.
783 #define FF_BUFFER_HINTS_REUSABLE 0x08 // Codec will reuse the buffer (update).
785 enum AVPacketSideDataType {
789 typedef struct AVPacket {
791 * Presentation timestamp in AVStream->time_base units; the time at which
792 * the decompressed packet will be presented to the user.
793 * Can be AV_NOPTS_VALUE if it is not stored in the file.
794 * pts MUST be larger or equal to dts as presentation cannot happen before
795 * decompression, unless one wants to view hex dumps. Some formats misuse
796 * the terms dts and pts/cts to mean something different. Such timestamps
797 * must be converted to true pts/dts before they are stored in AVPacket.
801 * Decompression timestamp in AVStream->time_base units; the time at which
802 * the packet is decompressed.
803 * Can be AV_NOPTS_VALUE if it is not stored in the file.
810 * A combination of AV_PKT_FLAG values
814 * Additional packet data that can be provided by the container.
815 * Packet can contain several types of side information.
820 enum AVPacketSideDataType type;
825 * Duration of this packet in AVStream->time_base units, 0 if unknown.
826 * Equals next_pts - this_pts in presentation order.
829 void (*destruct)(struct AVPacket *);
831 int64_t pos; ///< byte position in stream, -1 if unknown
834 * Time difference in AVStream->time_base units from the pts of this
835 * packet to the point at which the output from the decoder has converged
836 * independent from the availability of previous frames. That is, the
837 * frames are virtually identical no matter if decoding started from
838 * the very first frame or from this keyframe.
839 * Is AV_NOPTS_VALUE if unknown.
840 * This field is not the display duration of the current packet.
841 * This field has no meaning if the packet does not have AV_PKT_FLAG_KEY
844 * The purpose of this field is to allow seeking in streams that have no
845 * keyframes in the conventional sense. It corresponds to the
846 * recovery point SEI in H.264 and match_time_delta in NUT. It is also
847 * essential for some types of subtitle streams to ensure that all
848 * subtitles are correctly displayed after seeking.
850 int64_t convergence_duration;
852 #define AV_PKT_FLAG_KEY 0x0001 ///< The packet contains a keyframe
853 #define AV_PKT_FLAG_CORRUPT 0x0002 ///< The packet content is corrupted
857 * New fields can be added to the end of AVFRAME with minor version
858 * bumps. Removal, reordering and changes to existing fields require
859 * a major version bump.
860 * sizeof(AVFrame) must not be used outside libav*.
862 typedef struct AVFrame {
864 * pointer to the picture planes.
865 * This might be different from the first allocated byte
872 * pointer to the first allocated byte of the picture. Can be used in get_buffer/release_buffer.
873 * This isn't used by libavcodec unless the default get/release_buffer() is used.
879 * 1 -> keyframe, 0-> not
880 * - encoding: Set by libavcodec.
881 * - decoding: Set by libavcodec.
886 * Picture type of the frame, see ?_TYPE below.
887 * - encoding: Set by libavcodec. for coded_picture (and set by user for input).
888 * - decoding: Set by libavcodec.
890 enum AVPictureType pict_type;
893 * presentation timestamp in time_base units (time when frame should be shown to user)
894 * If AV_NOPTS_VALUE then frame_rate = 1/time_base will be assumed.
895 * - encoding: MUST be set by user.
896 * - decoding: Set by libavcodec.
901 * picture number in bitstream order
903 * - decoding: Set by libavcodec.
905 int coded_picture_number;
907 * picture number in display order
909 * - decoding: Set by libavcodec.
911 int display_picture_number;
914 * quality (between 1 (good) and FF_LAMBDA_MAX (bad))
915 * - encoding: Set by libavcodec. for coded_picture (and set by user for input).
916 * - decoding: Set by libavcodec.
921 * buffer age (1->was last buffer and dint change, 2->..., ...).
922 * Set to INT_MAX if the buffer has not been used yet.
924 * - decoding: MUST be set by get_buffer().
929 * is this picture used as reference
930 * The values for this are the same as the MpegEncContext.picture_structure
931 * variable, that is 1->top field, 2->bottom field, 3->frame/both fields.
932 * Set to 4 for delayed, non-reference frames.
934 * - decoding: Set by libavcodec. (before get_buffer() call)).
941 * - decoding: Set by libavcodec.
943 int8_t *qscale_table;
947 * - decoding: Set by libavcodec.
952 * mbskip_table[mb]>=1 if MB didn't change
953 * stride= mb_width = (width+15)>>4
955 * - decoding: Set by libavcodec.
957 uint8_t *mbskip_table;
960 * motion vector table
963 * int mv_sample_log2= 4 - motion_subsample_log2;
964 * int mb_width= (width+15)>>4;
965 * int mv_stride= (mb_width << mv_sample_log2) + 1;
966 * motion_val[direction][x + y*mv_stride][0->mv_x, 1->mv_y];
968 * - encoding: Set by user.
969 * - decoding: Set by libavcodec.
971 int16_t (*motion_val[2])[2];
974 * macroblock type table
975 * mb_type_base + mb_width + 2
976 * - encoding: Set by user.
977 * - decoding: Set by libavcodec.
982 * log2 of the size of the block which a single vector in motion_val represents:
983 * (4->16x16, 3->8x8, 2-> 4x4, 1-> 2x2)
985 * - decoding: Set by libavcodec.
987 uint8_t motion_subsample_log2;
990 * for some private data of the user
992 * - decoding: Set by user.
998 * - encoding: Set by libavcodec. if flags&CODEC_FLAG_PSNR.
1004 * type of the buffer (to keep track of who has to deallocate data[*])
1005 * - encoding: Set by the one who allocates it.
1006 * - decoding: Set by the one who allocates it.
1007 * Note: User allocated (direct rendering) & internal buffers cannot coexist currently.
1012 * When decoding, this signals how much the picture must be delayed.
1013 * extra_delay = repeat_pict / (2*fps)
1014 * - encoding: unused
1015 * - decoding: Set by libavcodec.
1025 * The content of the picture is interlaced.
1026 * - encoding: Set by user.
1027 * - decoding: Set by libavcodec. (default 0)
1029 int interlaced_frame;
1032 * If the content is interlaced, is top field displayed first.
1033 * - encoding: Set by user.
1034 * - decoding: Set by libavcodec.
1036 int top_field_first;
1040 * - encoding: Set by user.
1041 * - decoding: Set by libavcodec.
1043 AVPanScan *pan_scan;
1046 * Tell user application that palette has changed from previous frame.
1047 * - encoding: ??? (no palette-enabled encoder yet)
1048 * - decoding: Set by libavcodec. (default 0).
1050 int palette_has_changed;
1053 * codec suggestion on buffer type if != 0
1054 * - encoding: unused
1055 * - decoding: Set by libavcodec. (before get_buffer() call)).
1061 * - encoding: unused
1062 * - decoding: Set by libavcodec.
1067 * motion reference frame index
1068 * the order in which these are stored can depend on the codec.
1069 * - encoding: Set by user.
1070 * - decoding: Set by libavcodec.
1072 int8_t *ref_index[2];
1075 * reordered opaque 64bit (generally an integer or a double precision float
1076 * PTS but can be anything).
1077 * The user sets AVCodecContext.reordered_opaque to represent the input at
1079 * the decoder reorders values as needed and sets AVFrame.reordered_opaque
1080 * to exactly one of the values provided by the user through AVCodecContext.reordered_opaque
1081 * @deprecated in favor of pkt_pts
1082 * - encoding: unused
1083 * - decoding: Read by user.
1085 int64_t reordered_opaque;
1088 * hardware accelerator private data (FFmpeg-allocated)
1089 * - encoding: unused
1090 * - decoding: Set by libavcodec
1092 void *hwaccel_picture_private;
1095 * reordered pts from the last AVPacket that has been input into the decoder
1096 * - encoding: unused
1097 * - decoding: Read by user.
1102 * dts from the last AVPacket that has been input into the decoder
1103 * - encoding: unused
1104 * - decoding: Read by user.
1109 * the AVCodecContext which ff_thread_get_buffer() was last called on
1110 * - encoding: Set by libavcodec.
1111 * - decoding: Set by libavcodec.
1113 struct AVCodecContext *owner;
1116 * used by multithreading to store frame-specific info
1117 * - encoding: Set by libavcodec.
1118 * - decoding: Set by libavcodec.
1120 void *thread_opaque;
1123 * frame timestamp estimated using various heuristics, in stream time base
1124 * - encoding: unused
1125 * - decoding: set by libavcodec, read by user.
1127 int64_t best_effort_timestamp;
1130 * reordered pos from the last AVPacket that has been input into the decoder
1131 * - encoding: unused
1132 * - decoding: Read by user.
1137 * reordered sample aspect ratio for the video frame, 0/1 if unknown\unspecified
1138 * - encoding: unused
1139 * - decoding: Read by user.
1141 AVRational sample_aspect_ratio;
1144 * width and height of the video frame
1145 * - encoding: unused
1146 * - decoding: Read by user.
1151 * format of the frame, -1 if unknown or unset
1152 * It should be cast to the corresponding enum (enum PixelFormat
1153 * for video, enum AVSampleFormat for audio)
1154 * - encoding: unused
1155 * - decoding: Read by user.
1162 * main external API structure.
1163 * New fields can be added to the end with minor version bumps.
1164 * Removal, reordering and changes to existing fields require a major
1166 * sizeof(AVCodecContext) must not be used outside libav*.
1168 typedef struct AVCodecContext {
1170 * information on struct for av_log
1171 * - set by avcodec_alloc_context
1173 const AVClass *av_class;
1175 * the average bitrate
1176 * - encoding: Set by user; unused for constant quantizer encoding.
1177 * - decoding: Set by libavcodec. 0 or some bitrate if this info is available in the stream.
1182 * number of bits the bitstream is allowed to diverge from the reference.
1183 * the reference can be CBR (for CBR pass1) or VBR (for pass2)
1184 * - encoding: Set by user; unused for constant quantizer encoding.
1185 * - decoding: unused
1187 int bit_rate_tolerance;
1191 * - encoding: Set by user.
1192 * - decoding: Set by user.
1197 * Some codecs need additional format info. It is stored here.
1198 * If any muxer uses this then ALL demuxers/parsers AND encoders for the
1199 * specific codec MUST set it correctly otherwise stream copy breaks.
1200 * In general use of this field by muxers is not recommanded.
1201 * - encoding: Set by libavcodec.
1202 * - decoding: Set by libavcodec. (FIXME: Is this OK?)
1207 * Motion estimation algorithm used for video coding.
1208 * 1 (zero), 2 (full), 3 (log), 4 (phods), 5 (epzs), 6 (x1), 7 (hex),
1209 * 8 (umh), 9 (iter), 10 (tesa) [7, 8, 10 are x264 specific, 9 is snow specific]
1210 * - encoding: MUST be set by user.
1211 * - decoding: unused
1216 * some codecs need / can use extradata like Huffman tables.
1217 * mjpeg: Huffman tables
1218 * rv10: additional flags
1219 * mpeg4: global headers (they can be in the bitstream or here)
1220 * The allocated memory should be FF_INPUT_BUFFER_PADDING_SIZE bytes larger
1221 * than extradata_size to avoid prolems if it is read with the bitstream reader.
1222 * The bytewise contents of extradata must not depend on the architecture or CPU endianness.
1223 * - encoding: Set/allocated/freed by libavcodec.
1224 * - decoding: Set/allocated/freed by user.
1230 * This is the fundamental unit of time (in seconds) in terms
1231 * of which frame timestamps are represented. For fixed-fps content,
1232 * timebase should be 1/framerate and timestamp increments should be
1234 * - encoding: MUST be set by user.
1235 * - decoding: Set by libavcodec.
1237 AVRational time_base;
1241 * picture width / height.
1242 * - encoding: MUST be set by user.
1243 * - decoding: Set by libavcodec.
1244 * Note: For compatibility it is possible to set this instead of
1245 * coded_width/height before decoding.
1249 #define FF_ASPECT_EXTENDED 15
1252 * the number of pictures in a group of pictures, or 0 for intra_only
1253 * - encoding: Set by user.
1254 * - decoding: unused
1259 * Pixel format, see PIX_FMT_xxx.
1260 * May be set by the demuxer if known from headers.
1261 * May be overriden by the decoder if it knows better.
1262 * - encoding: Set by user.
1263 * - decoding: Set by user if known, overridden by libavcodec if known
1265 enum PixelFormat pix_fmt;
1268 * If non NULL, 'draw_horiz_band' is called by the libavcodec
1269 * decoder to draw a horizontal band. It improves cache usage. Not
1270 * all codecs can do that. You must check the codec capabilities
1272 * When multithreading is used, it may be called from multiple threads
1273 * at the same time; threads might draw different parts of the same AVFrame,
1274 * or multiple AVFrames, and there is no guarantee that slices will be drawn
1276 * The function is also used by hardware acceleration APIs.
1277 * It is called at least once during frame decoding to pass
1278 * the data needed for hardware render.
1279 * In that mode instead of pixel data, AVFrame points to
1280 * a structure specific to the acceleration API. The application
1281 * reads the structure and can change some fields to indicate progress
1283 * - encoding: unused
1284 * - decoding: Set by user.
1285 * @param height the height of the slice
1286 * @param y the y position of the slice
1287 * @param type 1->top field, 2->bottom field, 3->frame
1288 * @param offset offset into the AVFrame.data from which the slice should be read
1290 void (*draw_horiz_band)(struct AVCodecContext *s,
1291 const AVFrame *src, int offset[4],
1292 int y, int type, int height);
1295 int sample_rate; ///< samples per second
1296 int channels; ///< number of audio channels
1299 * audio sample format
1300 * - encoding: Set by user.
1301 * - decoding: Set by libavcodec.
1303 enum AVSampleFormat sample_fmt; ///< sample format
1305 /* The following data should not be initialized. */
1307 * Samples per packet, initialized when calling 'init'.
1310 int frame_number; ///< audio or video frame number
1313 * Number of frames the decoded output will be delayed relative to
1314 * the encoded input.
1315 * - encoding: Set by libavcodec.
1316 * - decoding: unused
1320 /* - encoding parameters */
1321 float qcompress; ///< amount of qscale change between easy & hard scenes (0.0-1.0)
1322 float qblur; ///< amount of qscale smoothing over time (0.0-1.0)
1326 * - encoding: Set by user.
1327 * - decoding: unused
1333 * - encoding: Set by user.
1334 * - decoding: unused
1339 * maximum quantizer difference between frames
1340 * - encoding: Set by user.
1341 * - decoding: unused
1346 * maximum number of B-frames between non-B-frames
1347 * Note: The output will be delayed by max_b_frames+1 relative to the input.
1348 * - encoding: Set by user.
1349 * - decoding: unused
1354 * qscale factor between IP and B-frames
1355 * If > 0 then the last P-frame quantizer will be used (q= lastp_q*factor+offset).
1356 * If < 0 then normal ratecontrol will be done (q= -normal_q*factor+offset).
1357 * - encoding: Set by user.
1358 * - decoding: unused
1360 float b_quant_factor;
1362 /** obsolete FIXME remove */
1364 #define FF_RC_STRATEGY_XVID 1
1366 int b_frame_strategy;
1368 struct AVCodec *codec;
1372 int rtp_payload_size; /* The size of the RTP payload: the coder will */
1373 /* do its best to deliver a chunk with size */
1374 /* below rtp_payload_size, the chunk will start */
1375 /* with a start code on some codecs like H.263. */
1376 /* This doesn't take account of any particular */
1377 /* headers inside the transmitted RTP payload. */
1380 /* The RTP callback: This function is called */
1381 /* every time the encoder has a packet to send. */
1382 /* It depends on the encoder if the data starts */
1383 /* with a Start Code (it should). H.263 does. */
1384 /* mb_nb contains the number of macroblocks */
1385 /* encoded in the RTP payload. */
1386 void (*rtp_callback)(struct AVCodecContext *avctx, void *data, int size, int mb_nb);
1388 /* statistics, used for 2-pass encoding */
1399 * number of bits used for the previously encoded frame
1400 * - encoding: Set by libavcodec.
1401 * - decoding: unused
1406 * Private data of the user, can be used to carry app specific stuff.
1407 * - encoding: Set by user.
1408 * - decoding: Set by user.
1412 char codec_name[32];
1413 enum AVMediaType codec_type; /* see AVMEDIA_TYPE_xxx */
1414 enum CodecID codec_id; /* see CODEC_ID_xxx */
1417 * fourcc (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A').
1418 * This is used to work around some encoder bugs.
1419 * A demuxer should set this to what is stored in the field used to identify the codec.
1420 * If there are multiple such fields in a container then the demuxer should choose the one
1421 * which maximizes the information about the used codec.
1422 * If the codec tag field in a container is larger than 32 bits then the demuxer should
1423 * remap the longer ID to 32 bits with a table or other structure. Alternatively a new
1424 * extra_codec_tag + size could be added but for this a clear advantage must be demonstrated
1426 * - encoding: Set by user, if not then the default based on codec_id will be used.
1427 * - decoding: Set by user, will be converted to uppercase by libavcodec during init.
1429 unsigned int codec_tag;
1432 * Work around bugs in encoders which sometimes cannot be detected automatically.
1433 * - encoding: Set by user
1434 * - decoding: Set by user
1436 int workaround_bugs;
1437 #define FF_BUG_AUTODETECT 1 ///< autodetection
1438 #define FF_BUG_OLD_MSMPEG4 2
1439 #define FF_BUG_XVID_ILACE 4
1440 #define FF_BUG_UMP4 8
1441 #define FF_BUG_NO_PADDING 16
1442 #define FF_BUG_AMV 32
1443 #define FF_BUG_AC_VLC 0 ///< Will be removed, libavcodec can now handle these non-compliant files by default.
1444 #define FF_BUG_QPEL_CHROMA 64
1445 #define FF_BUG_STD_QPEL 128
1446 #define FF_BUG_QPEL_CHROMA2 256
1447 #define FF_BUG_DIRECT_BLOCKSIZE 512
1448 #define FF_BUG_EDGE 1024
1449 #define FF_BUG_HPEL_CHROMA 2048
1450 #define FF_BUG_DC_CLIP 4096
1451 #define FF_BUG_MS 8192 ///< Work around various bugs in Microsoft's broken decoders.
1452 #define FF_BUG_TRUNCATED 16384
1453 //#define FF_BUG_FAKE_SCALABILITY 16 //Autodetection should work 100%.
1456 * luma single coefficient elimination threshold
1457 * - encoding: Set by user.
1458 * - decoding: unused
1460 int luma_elim_threshold;
1463 * chroma single coeff elimination threshold
1464 * - encoding: Set by user.
1465 * - decoding: unused
1467 int chroma_elim_threshold;
1470 * strictly follow the standard (MPEG4, ...).
1471 * - encoding: Set by user.
1472 * - decoding: Set by user.
1473 * Setting this to STRICT or higher means the encoder and decoder will
1474 * generally do stupid things, whereas setting it to unofficial or lower
1475 * will mean the encoder might produce output that is not supported by all
1476 * spec-compliant decoders. Decoders don't differentiate between normal,
1477 * unofficial and experimental (that is, they always try to decode things
1478 * when they can) unless they are explicitly asked to behave stupidly
1479 * (=strictly conform to the specs)
1481 int strict_std_compliance;
1482 #define FF_COMPLIANCE_VERY_STRICT 2 ///< Strictly conform to an older more strict version of the spec or reference software.
1483 #define FF_COMPLIANCE_STRICT 1 ///< Strictly conform to all the things in the spec no matter what consequences.
1484 #define FF_COMPLIANCE_NORMAL 0
1485 #define FF_COMPLIANCE_UNOFFICIAL -1 ///< Allow unofficial extensions
1486 #define FF_COMPLIANCE_EXPERIMENTAL -2 ///< Allow nonstandardized experimental things.
1489 * qscale offset between IP and B-frames
1490 * - encoding: Set by user.
1491 * - decoding: unused
1493 float b_quant_offset;
1496 * Error recognition; higher values will detect more errors but may
1497 * misdetect some more or less valid parts as errors.
1498 * - encoding: unused
1499 * - decoding: Set by user.
1501 int error_recognition;
1502 #define FF_ER_CAREFUL 1
1503 #define FF_ER_COMPLIANT 2
1504 #define FF_ER_AGGRESSIVE 3
1505 #if FF_API_VERY_AGGRESSIVE
1506 #define FF_ER_VERY_AGGRESSIVE 4
1507 #define FF_ER_EXPLODE 5
1509 #define FF_ER_EXPLODE 4
1510 #endif /* FF_API_VERY_AGGRESSIVE */
1513 * Called at the beginning of each frame to get a buffer for it.
1514 * If pic.reference is set then the frame will be read later by libavcodec.
1515 * avcodec_align_dimensions2() should be used to find the required width and
1516 * height, as they normally need to be rounded up to the next multiple of 16.
1517 * if CODEC_CAP_DR1 is not set then get_buffer() must call
1518 * avcodec_default_get_buffer() instead of providing buffers allocated by
1520 * If frame multithreading is used and thread_safe_callbacks is set,
1521 * it may be called from a different thread, but not from more than one at once.
1522 * Does not need to be reentrant.
1523 * - encoding: unused
1524 * - decoding: Set by libavcodec, user can override.
1526 int (*get_buffer)(struct AVCodecContext *c, AVFrame *pic);
1529 * Called to release buffers which were allocated with get_buffer.
1530 * A released buffer can be reused in get_buffer().
1531 * pic.data[*] must be set to NULL.
1532 * May be called from a different thread if frame multithreading is used,
1533 * but not by more than one thread at once, so does not need to be reentrant.
1534 * - encoding: unused
1535 * - decoding: Set by libavcodec, user can override.
1537 void (*release_buffer)(struct AVCodecContext *c, AVFrame *pic);
1540 * Size of the frame reordering buffer in the decoder.
1541 * For MPEG-2 it is 1 IPB or 0 low delay IP.
1542 * - encoding: Set by libavcodec.
1543 * - decoding: Set by libavcodec.
1548 * number of bytes per packet if constant and known or 0
1549 * Used by some WAV based audio codecs.
1553 int parse_only; /* - decoding only: If true, only parsing is done
1554 (function avcodec_parse_frame()). The frame
1555 data is returned. Only MPEG codecs support this now. */
1558 * 0-> h263 quant 1-> mpeg quant
1559 * - encoding: Set by user.
1560 * - decoding: unused
1565 * pass1 encoding statistics output buffer
1566 * - encoding: Set by libavcodec.
1567 * - decoding: unused
1572 * pass2 encoding statistics input buffer
1573 * Concatenated stuff from stats_out of pass1 should be placed here.
1574 * - encoding: Allocated/set/freed by user.
1575 * - decoding: unused
1580 * ratecontrol qmin qmax limiting method
1581 * 0-> clipping, 1-> use a nice continous function to limit qscale wthin qmin/qmax.
1582 * - encoding: Set by user.
1583 * - decoding: unused
1591 * ratecontrol override, see RcOverride
1592 * - encoding: Allocated/set/freed by user.
1593 * - decoding: unused
1595 RcOverride *rc_override;
1596 int rc_override_count;
1599 * rate control equation
1600 * - encoding: Set by user
1601 * - decoding: unused
1607 * - encoding: Set by user.
1608 * - decoding: unused
1614 * - encoding: Set by user.
1615 * - decoding: unused
1620 * decoder bitstream buffer size
1621 * - encoding: Set by user.
1622 * - decoding: unused
1625 float rc_buffer_aggressivity;
1628 * qscale factor between P and I-frames
1629 * If > 0 then the last p frame quantizer will be used (q= lastp_q*factor+offset).
1630 * If < 0 then normal ratecontrol will be done (q= -normal_q*factor+offset).
1631 * - encoding: Set by user.
1632 * - decoding: unused
1634 float i_quant_factor;
1637 * qscale offset between P and I-frames
1638 * - encoding: Set by user.
1639 * - decoding: unused
1641 float i_quant_offset;
1644 * initial complexity for pass1 ratecontrol
1645 * - encoding: Set by user.
1646 * - decoding: unused
1648 float rc_initial_cplx;
1651 * DCT algorithm, see FF_DCT_* below
1652 * - encoding: Set by user.
1653 * - decoding: unused
1656 #define FF_DCT_AUTO 0
1657 #define FF_DCT_FASTINT 1
1658 #define FF_DCT_INT 2
1659 #define FF_DCT_MMX 3
1660 #define FF_DCT_MLIB 4
1661 #define FF_DCT_ALTIVEC 5
1662 #define FF_DCT_FAAN 6
1665 * luminance masking (0-> disabled)
1666 * - encoding: Set by user.
1667 * - decoding: unused
1672 * temporary complexity masking (0-> disabled)
1673 * - encoding: Set by user.
1674 * - decoding: unused
1676 float temporal_cplx_masking;
1679 * spatial complexity masking (0-> disabled)
1680 * - encoding: Set by user.
1681 * - decoding: unused
1683 float spatial_cplx_masking;
1686 * p block masking (0-> disabled)
1687 * - encoding: Set by user.
1688 * - decoding: unused
1693 * darkness masking (0-> disabled)
1694 * - encoding: Set by user.
1695 * - decoding: unused
1700 * IDCT algorithm, see FF_IDCT_* below.
1701 * - encoding: Set by user.
1702 * - decoding: Set by user.
1705 #define FF_IDCT_AUTO 0
1706 #define FF_IDCT_INT 1
1707 #define FF_IDCT_SIMPLE 2
1708 #define FF_IDCT_SIMPLEMMX 3
1709 #define FF_IDCT_LIBMPEG2MMX 4
1710 #define FF_IDCT_PS2 5
1711 #define FF_IDCT_MLIB 6
1712 #define FF_IDCT_ARM 7
1713 #define FF_IDCT_ALTIVEC 8
1714 #define FF_IDCT_SH4 9
1715 #define FF_IDCT_SIMPLEARM 10
1716 #define FF_IDCT_H264 11
1717 #define FF_IDCT_VP3 12
1718 #define FF_IDCT_IPP 13
1719 #define FF_IDCT_XVIDMMX 14
1720 #define FF_IDCT_CAVS 15
1721 #define FF_IDCT_SIMPLEARMV5TE 16
1722 #define FF_IDCT_SIMPLEARMV6 17
1723 #define FF_IDCT_SIMPLEVIS 18
1724 #define FF_IDCT_WMV2 19
1725 #define FF_IDCT_FAAN 20
1726 #define FF_IDCT_EA 21
1727 #define FF_IDCT_SIMPLENEON 22
1728 #define FF_IDCT_SIMPLEALPHA 23
1729 #define FF_IDCT_BINK 24
1733 * - encoding: Set by libavcodec.
1734 * - decoding: Set by user (or 0).
1738 * slice offsets in the frame in bytes
1739 * - encoding: Set/allocated by libavcodec.
1740 * - decoding: Set/allocated by user (or NULL).
1745 * error concealment flags
1746 * - encoding: unused
1747 * - decoding: Set by user.
1749 int error_concealment;
1750 #define FF_EC_GUESS_MVS 1
1751 #define FF_EC_DEBLOCK 2
1754 * dsp_mask could be add used to disable unwanted CPU features
1755 * CPU features (i.e. MMX, SSE. ...)
1757 * With the FORCE flag you may instead enable given CPU features.
1758 * (Dangerous: Usable in case of misdetection, improper usage however will
1759 * result into program crash.)
1764 * bits per sample/pixel from the demuxer (needed for huffyuv).
1765 * - encoding: Set by libavcodec.
1766 * - decoding: Set by user.
1768 int bits_per_coded_sample;
1771 * prediction method (needed for huffyuv)
1772 * - encoding: Set by user.
1773 * - decoding: unused
1775 int prediction_method;
1776 #define FF_PRED_LEFT 0
1777 #define FF_PRED_PLANE 1
1778 #define FF_PRED_MEDIAN 2
1781 * sample aspect ratio (0 if unknown)
1782 * That is the width of a pixel divided by the height of the pixel.
1783 * Numerator and denominator must be relatively prime and smaller than 256 for some video standards.
1784 * - encoding: Set by user.
1785 * - decoding: Set by libavcodec.
1787 AVRational sample_aspect_ratio;
1790 * the picture in the bitstream
1791 * - encoding: Set by libavcodec.
1792 * - decoding: Set by libavcodec.
1794 AVFrame *coded_frame;
1798 * - encoding: Set by user.
1799 * - decoding: Set by user.
1802 #define FF_DEBUG_PICT_INFO 1
1803 #define FF_DEBUG_RC 2
1804 #define FF_DEBUG_BITSTREAM 4
1805 #define FF_DEBUG_MB_TYPE 8
1806 #define FF_DEBUG_QP 16
1807 #define FF_DEBUG_MV 32
1808 #define FF_DEBUG_DCT_COEFF 0x00000040
1809 #define FF_DEBUG_SKIP 0x00000080
1810 #define FF_DEBUG_STARTCODE 0x00000100
1811 #define FF_DEBUG_PTS 0x00000200
1812 #define FF_DEBUG_ER 0x00000400
1813 #define FF_DEBUG_MMCO 0x00000800
1814 #define FF_DEBUG_BUGS 0x00001000
1815 #define FF_DEBUG_VIS_QP 0x00002000
1816 #define FF_DEBUG_VIS_MB_TYPE 0x00004000
1817 #define FF_DEBUG_BUFFERS 0x00008000
1818 #define FF_DEBUG_THREADS 0x00010000
1822 * - encoding: Set by user.
1823 * - decoding: Set by user.
1826 #define FF_DEBUG_VIS_MV_P_FOR 0x00000001 //visualize forward predicted MVs of P frames
1827 #define FF_DEBUG_VIS_MV_B_FOR 0x00000002 //visualize forward predicted MVs of B frames
1828 #define FF_DEBUG_VIS_MV_B_BACK 0x00000004 //visualize backward predicted MVs of B frames
1832 * - encoding: Set by libavcodec if flags&CODEC_FLAG_PSNR.
1833 * - decoding: unused
1838 * motion estimation comparison function
1839 * - encoding: Set by user.
1840 * - decoding: unused
1844 * subpixel motion estimation comparison function
1845 * - encoding: Set by user.
1846 * - decoding: unused
1850 * macroblock comparison function (not supported yet)
1851 * - encoding: Set by user.
1852 * - decoding: unused
1856 * interlaced DCT comparison function
1857 * - encoding: Set by user.
1858 * - decoding: unused
1861 #define FF_CMP_SAD 0
1862 #define FF_CMP_SSE 1
1863 #define FF_CMP_SATD 2
1864 #define FF_CMP_DCT 3
1865 #define FF_CMP_PSNR 4
1866 #define FF_CMP_BIT 5
1868 #define FF_CMP_ZERO 7
1869 #define FF_CMP_VSAD 8
1870 #define FF_CMP_VSSE 9
1871 #define FF_CMP_NSSE 10
1872 #define FF_CMP_W53 11
1873 #define FF_CMP_W97 12
1874 #define FF_CMP_DCTMAX 13
1875 #define FF_CMP_DCT264 14
1876 #define FF_CMP_CHROMA 256
1879 * ME diamond size & shape
1880 * - encoding: Set by user.
1881 * - decoding: unused
1886 * amount of previous MV predictors (2a+1 x 2a+1 square)
1887 * - encoding: Set by user.
1888 * - decoding: unused
1890 int last_predictor_count;
1893 * prepass for motion estimation
1894 * - encoding: Set by user.
1895 * - decoding: unused
1900 * motion estimation prepass comparison function
1901 * - encoding: Set by user.
1902 * - decoding: unused
1907 * ME prepass diamond size & shape
1908 * - encoding: Set by user.
1909 * - decoding: unused
1915 * - encoding: Set by user.
1916 * - decoding: unused
1918 int me_subpel_quality;
1921 * callback to negotiate the pixelFormat
1922 * @param fmt is the list of formats which are supported by the codec,
1923 * it is terminated by -1 as 0 is a valid format, the formats are ordered by quality.
1924 * The first is always the native one.
1925 * @return the chosen format
1926 * - encoding: unused
1927 * - decoding: Set by user, if not set the native format will be chosen.
1929 enum PixelFormat (*get_format)(struct AVCodecContext *s, const enum PixelFormat * fmt);
1932 * DTG active format information (additional aspect ratio
1933 * information only used in DVB MPEG-2 transport streams)
1936 * - encoding: unused
1937 * - decoding: Set by decoder.
1939 int dtg_active_format;
1940 #define FF_DTG_AFD_SAME 8
1941 #define FF_DTG_AFD_4_3 9
1942 #define FF_DTG_AFD_16_9 10
1943 #define FF_DTG_AFD_14_9 11
1944 #define FF_DTG_AFD_4_3_SP_14_9 13
1945 #define FF_DTG_AFD_16_9_SP_14_9 14
1946 #define FF_DTG_AFD_SP_4_3 15
1949 * maximum motion estimation search range in subpel units
1950 * If 0 then no limit.
1952 * - encoding: Set by user.
1953 * - decoding: unused
1958 * intra quantizer bias
1959 * - encoding: Set by user.
1960 * - decoding: unused
1962 int intra_quant_bias;
1963 #define FF_DEFAULT_QUANT_BIAS 999999
1966 * inter quantizer bias
1967 * - encoding: Set by user.
1968 * - decoding: unused
1970 int inter_quant_bias;
1974 * - encoding: unused
1975 * - decoding: Which clrtable should be used for 8bit RGB images.
1976 * Tables have to be stored somewhere. FIXME
1981 * internal_buffer count
1982 * Don't touch, used by libavcodec default_get_buffer().
1984 int internal_buffer_count;
1988 * Don't touch, used by libavcodec default_get_buffer().
1990 void *internal_buffer;
1993 * Global quality for codecs which cannot change it per frame.
1994 * This should be proportional to MPEG-1/2/4 qscale.
1995 * - encoding: Set by user.
1996 * - decoding: unused
2000 #define FF_CODER_TYPE_VLC 0
2001 #define FF_CODER_TYPE_AC 1
2002 #define FF_CODER_TYPE_RAW 2
2003 #define FF_CODER_TYPE_RLE 3
2004 #define FF_CODER_TYPE_DEFLATE 4
2007 * - encoding: Set by user.
2008 * - decoding: unused
2014 * - encoding: Set by user.
2015 * - decoding: unused
2021 * - encoding: unused
2022 * - decoding: Set by user.
2024 uint8_t * (*realloc)(struct AVCodecContext *s, uint8_t *buf, int buf_size);
2029 * - encoding: unused
2030 * - decoding: Set by user.
2033 #define SLICE_FLAG_CODED_ORDER 0x0001 ///< draw_horiz_band() is called in coded order instead of display
2034 #define SLICE_FLAG_ALLOW_FIELD 0x0002 ///< allow draw_horiz_band() with field slices (MPEG2 field pics)
2035 #define SLICE_FLAG_ALLOW_PLANE 0x0004 ///< allow draw_horiz_band() with 1 component at a time (SVQ1)
2038 * XVideo Motion Acceleration
2039 * - encoding: forbidden
2040 * - decoding: set by decoder
2042 int xvmc_acceleration;
2045 * macroblock decision mode
2046 * - encoding: Set by user.
2047 * - decoding: unused
2050 #define FF_MB_DECISION_SIMPLE 0 ///< uses mb_cmp
2051 #define FF_MB_DECISION_BITS 1 ///< chooses the one which needs the fewest bits
2052 #define FF_MB_DECISION_RD 2 ///< rate distortion
2055 * custom intra quantization matrix
2056 * - encoding: Set by user, can be NULL.
2057 * - decoding: Set by libavcodec.
2059 uint16_t *intra_matrix;
2062 * custom inter quantization matrix
2063 * - encoding: Set by user, can be NULL.
2064 * - decoding: Set by libavcodec.
2066 uint16_t *inter_matrix;
2069 * fourcc from the AVI stream header (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A').
2070 * This is used to work around some encoder bugs.
2071 * - encoding: unused
2072 * - decoding: Set by user, will be converted to uppercase by libavcodec during init.
2074 unsigned int stream_codec_tag;
2077 * scene change detection threshold
2078 * 0 is default, larger means fewer detected scene changes.
2079 * - encoding: Set by user.
2080 * - decoding: unused
2082 int scenechange_threshold;
2085 * minimum Lagrange multipler
2086 * - encoding: Set by user.
2087 * - decoding: unused
2092 * maximum Lagrange multipler
2093 * - encoding: Set by user.
2094 * - decoding: unused
2098 #if FF_API_PALETTE_CONTROL
2100 * palette control structure
2101 * - encoding: ??? (no palette-enabled encoder yet)
2102 * - decoding: Set by user.
2104 struct AVPaletteControl *palctrl;
2108 * noise reduction strength
2109 * - encoding: Set by user.
2110 * - decoding: unused
2112 int noise_reduction;
2115 * Called at the beginning of a frame to get cr buffer for it.
2116 * Buffer type (size, hints) must be the same. libavcodec won't check it.
2117 * libavcodec will pass previous buffer in pic, function should return
2118 * same buffer or new buffer with old frame "painted" into it.
2119 * If pic.data[0] == NULL must behave like get_buffer().
2120 * if CODEC_CAP_DR1 is not set then reget_buffer() must call
2121 * avcodec_default_reget_buffer() instead of providing buffers allocated by
2123 * - encoding: unused
2124 * - decoding: Set by libavcodec, user can override.
2126 int (*reget_buffer)(struct AVCodecContext *c, AVFrame *pic);
2129 * Number of bits which should be loaded into the rc buffer before decoding starts.
2130 * - encoding: Set by user.
2131 * - decoding: unused
2133 int rc_initial_buffer_occupancy;
2137 * - encoding: Set by user.
2138 * - decoding: unused
2140 int inter_threshold;
2144 * - encoding: Set by user.
2145 * - decoding: Set by user.
2150 * Simulates errors in the bitstream to test error concealment.
2151 * - encoding: Set by user.
2152 * - decoding: unused
2156 #if FF_API_ANTIALIAS_ALGO
2158 * MP3 antialias algorithm, see FF_AA_* below.
2159 * - encoding: unused
2160 * - decoding: Set by user.
2162 attribute_deprecated int antialias_algo;
2163 #define FF_AA_AUTO 0
2164 #define FF_AA_FASTINT 1 //not implemented yet
2166 #define FF_AA_FLOAT 3
2170 * quantizer noise shaping
2171 * - encoding: Set by user.
2172 * - decoding: unused
2174 int quantizer_noise_shaping;
2178 * is used to decide how many independent tasks should be passed to execute()
2179 * - encoding: Set by user.
2180 * - decoding: Set by user.
2185 * The codec may call this to execute several independent things.
2186 * It will return only after finishing all tasks.
2187 * The user may replace this with some multithreaded implementation,
2188 * the default implementation will execute the parts serially.
2189 * @param count the number of things to execute
2190 * - encoding: Set by libavcodec, user can override.
2191 * - decoding: Set by libavcodec, user can override.
2193 int (*execute)(struct AVCodecContext *c, int (*func)(struct AVCodecContext *c2, void *arg), void *arg2, int *ret, int count, int size);
2197 * Can be used by execute() to store some per AVCodecContext stuff.
2198 * - encoding: set by execute()
2199 * - decoding: set by execute()
2201 void *thread_opaque;
2204 * Motion estimation threshold below which no motion estimation is
2205 * performed, but instead the user specified motion vectors are used.
2207 * - encoding: Set by user.
2208 * - decoding: unused
2213 * Macroblock threshold below which the user specified macroblock types will be used.
2214 * - encoding: Set by user.
2215 * - decoding: unused
2220 * precision of the intra DC coefficient - 8
2221 * - encoding: Set by user.
2222 * - decoding: unused
2224 int intra_dc_precision;
2227 * noise vs. sse weight for the nsse comparsion function
2228 * - encoding: Set by user.
2229 * - decoding: unused
2234 * Number of macroblock rows at the top which are skipped.
2235 * - encoding: unused
2236 * - decoding: Set by user.
2241 * Number of macroblock rows at the bottom which are skipped.
2242 * - encoding: unused
2243 * - decoding: Set by user.
2249 * - encoding: Set by user.
2250 * - decoding: Set by libavcodec.
2253 #define FF_PROFILE_UNKNOWN -99
2254 #define FF_PROFILE_RESERVED -100
2256 #define FF_PROFILE_AAC_MAIN 0
2257 #define FF_PROFILE_AAC_LOW 1
2258 #define FF_PROFILE_AAC_SSR 2
2259 #define FF_PROFILE_AAC_LTP 3
2261 #define FF_PROFILE_DTS 20
2262 #define FF_PROFILE_DTS_ES 30
2263 #define FF_PROFILE_DTS_96_24 40
2264 #define FF_PROFILE_DTS_HD_HRA 50
2265 #define FF_PROFILE_DTS_HD_MA 60
2267 #define FF_PROFILE_MPEG2_422 0
2268 #define FF_PROFILE_MPEG2_HIGH 1
2269 #define FF_PROFILE_MPEG2_SS 2
2270 #define FF_PROFILE_MPEG2_SNR_SCALABLE 3
2271 #define FF_PROFILE_MPEG2_MAIN 4
2272 #define FF_PROFILE_MPEG2_SIMPLE 5
2274 #define FF_PROFILE_H264_CONSTRAINED (1<<9) // 8+1; constraint_set1_flag
2275 #define FF_PROFILE_H264_INTRA (1<<11) // 8+3; constraint_set3_flag
2277 #define FF_PROFILE_H264_BASELINE 66
2278 #define FF_PROFILE_H264_CONSTRAINED_BASELINE (66|FF_PROFILE_H264_CONSTRAINED)
2279 #define FF_PROFILE_H264_MAIN 77
2280 #define FF_PROFILE_H264_EXTENDED 88
2281 #define FF_PROFILE_H264_HIGH 100
2282 #define FF_PROFILE_H264_HIGH_10 110
2283 #define FF_PROFILE_H264_HIGH_10_INTRA (110|FF_PROFILE_H264_INTRA)
2284 #define FF_PROFILE_H264_HIGH_422 122
2285 #define FF_PROFILE_H264_HIGH_422_INTRA (122|FF_PROFILE_H264_INTRA)
2286 #define FF_PROFILE_H264_HIGH_444 144
2287 #define FF_PROFILE_H264_HIGH_444_PREDICTIVE 244
2288 #define FF_PROFILE_H264_HIGH_444_INTRA (244|FF_PROFILE_H264_INTRA)
2289 #define FF_PROFILE_H264_CAVLC_444 44
2291 #define FF_PROFILE_VC1_SIMPLE 0
2292 #define FF_PROFILE_VC1_MAIN 1
2293 #define FF_PROFILE_VC1_COMPLEX 2
2294 #define FF_PROFILE_VC1_ADVANCED 3
2296 #define FF_PROFILE_MPEG4_SIMPLE 0
2297 #define FF_PROFILE_MPEG4_SIMPLE_SCALABLE 1
2298 #define FF_PROFILE_MPEG4_CORE 2
2299 #define FF_PROFILE_MPEG4_MAIN 3
2300 #define FF_PROFILE_MPEG4_N_BIT 4
2301 #define FF_PROFILE_MPEG4_SCALABLE_TEXTURE 5
2302 #define FF_PROFILE_MPEG4_SIMPLE_FACE_ANIMATION 6
2303 #define FF_PROFILE_MPEG4_BASIC_ANIMATED_TEXTURE 7
2304 #define FF_PROFILE_MPEG4_HYBRID 8
2305 #define FF_PROFILE_MPEG4_ADVANCED_REAL_TIME 9
2306 #define FF_PROFILE_MPEG4_CORE_SCALABLE 10
2307 #define FF_PROFILE_MPEG4_ADVANCED_CODING 11
2308 #define FF_PROFILE_MPEG4_ADVANCED_CORE 12
2309 #define FF_PROFILE_MPEG4_ADVANCED_SCALABLE_TEXTURE 13
2310 #define FF_PROFILE_MPEG4_SIMPLE_STUDIO 14
2311 #define FF_PROFILE_MPEG4_ADVANCED_SIMPLE 15
2315 * - encoding: Set by user.
2316 * - decoding: Set by libavcodec.
2319 #define FF_LEVEL_UNKNOWN -99
2322 * low resolution decoding, 1-> 1/2 size, 2->1/4 size
2323 * - encoding: unused
2324 * - decoding: Set by user.
2329 * Bitstream width / height, may be different from width/height if lowres
2330 * or other things are used.
2331 * - encoding: unused
2332 * - decoding: Set by user before init if known. Codec should override / dynamically change if needed.
2334 int coded_width, coded_height;
2337 * frame skip threshold
2338 * - encoding: Set by user.
2339 * - decoding: unused
2341 int frame_skip_threshold;
2345 * - encoding: Set by user.
2346 * - decoding: unused
2348 int frame_skip_factor;
2351 * frame skip exponent
2352 * - encoding: Set by user.
2353 * - decoding: unused
2358 * frame skip comparison function
2359 * - encoding: Set by user.
2360 * - decoding: unused
2365 * Border processing masking, raises the quantizer for mbs on the borders
2367 * - encoding: Set by user.
2368 * - decoding: unused
2370 float border_masking;
2373 * minimum MB lagrange multipler
2374 * - encoding: Set by user.
2375 * - decoding: unused
2380 * maximum MB lagrange multipler
2381 * - encoding: Set by user.
2382 * - decoding: unused
2388 * - encoding: Set by user.
2389 * - decoding: unused
2391 int me_penalty_compensation;
2395 * - encoding: unused
2396 * - decoding: Set by user.
2398 enum AVDiscard skip_loop_filter;
2402 * - encoding: unused
2403 * - decoding: Set by user.
2405 enum AVDiscard skip_idct;
2409 * - encoding: unused
2410 * - decoding: Set by user.
2412 enum AVDiscard skip_frame;
2416 * - encoding: Set by user.
2417 * - decoding: unused
2423 * - encoding: Set by user.
2424 * - decoding: unused
2428 #if FF_API_X264_GLOBAL_OPTS
2430 * constant rate factor - quality-based VBR - values ~correspond to qps
2431 * - encoding: Set by user.
2432 * - decoding: unused
2433 * @deprecated use 'crf' libx264 private option
2435 attribute_deprecated float crf;
2438 * constant quantization parameter rate control method
2439 * - encoding: Set by user.
2440 * - decoding: unused
2441 * @deprecated use 'cqp' libx264 private option
2443 attribute_deprecated int cqp;
2448 * - encoding: Set by user.
2449 * - decoding: unused
2454 * number of reference frames
2455 * - encoding: Set by user.
2456 * - decoding: Set by lavc.
2461 * chroma qp offset from luma
2462 * - encoding: Set by user.
2463 * - decoding: unused
2468 * Influences how often B-frames are used.
2469 * - encoding: Set by user.
2470 * - decoding: unused
2475 * trellis RD quantization
2476 * - encoding: Set by user.
2477 * - decoding: unused
2482 * Reduce fluctuations in qp (before curve compression).
2483 * - encoding: Set by user.
2484 * - decoding: unused
2486 float complexityblur;
2489 * in-loop deblocking filter alphac0 parameter
2490 * alpha is in the range -6...6
2491 * - encoding: Set by user.
2492 * - decoding: unused
2497 * in-loop deblocking filter beta parameter
2498 * beta is in the range -6...6
2499 * - encoding: Set by user.
2500 * - decoding: unused
2505 * macroblock subpartition sizes to consider - p8x8, p4x4, b8x8, i8x8, i4x4
2506 * - encoding: Set by user.
2507 * - decoding: unused
2510 #define X264_PART_I4X4 0x001 /* Analyze i4x4 */
2511 #define X264_PART_I8X8 0x002 /* Analyze i8x8 (requires 8x8 transform) */
2512 #define X264_PART_P8X8 0x010 /* Analyze p16x8, p8x16 and p8x8 */
2513 #define X264_PART_P4X4 0x020 /* Analyze p8x4, p4x8, p4x4 */
2514 #define X264_PART_B8X8 0x100 /* Analyze b16x8, b8x16 and b8x8 */
2517 * direct MV prediction mode - 0 (none), 1 (spatial), 2 (temporal), 3 (auto)
2518 * - encoding: Set by user.
2519 * - decoding: unused
2524 * Audio cutoff bandwidth (0 means "automatic")
2525 * - encoding: Set by user.
2526 * - decoding: unused
2531 * Multiplied by qscale for each frame and added to scene_change_score.
2532 * - encoding: Set by user.
2533 * - decoding: unused
2535 int scenechange_factor;
2539 * Note: Value depends upon the compare function used for fullpel ME.
2540 * - encoding: Set by user.
2541 * - decoding: unused
2546 * Adjusts sensitivity of b_frame_strategy 1.
2547 * - encoding: Set by user.
2548 * - decoding: unused
2553 * - encoding: Set by user.
2554 * - decoding: unused
2556 int compression_level;
2557 #define FF_COMPRESSION_DEFAULT -1
2560 * - encoding: Set by user.
2561 * - decoding: unused
2563 int min_prediction_order;
2566 * - encoding: Set by user.
2567 * - decoding: unused
2569 int max_prediction_order;
2571 #if FF_API_FLAC_GLOBAL_OPTS
2573 * @name FLAC options
2574 * @deprecated Use FLAC encoder private options instead.
2579 * LPC coefficient precision - used by FLAC encoder
2580 * - encoding: Set by user.
2581 * - decoding: unused
2583 attribute_deprecated int lpc_coeff_precision;
2586 * search method for selecting prediction order
2587 * - encoding: Set by user.
2588 * - decoding: unused
2590 attribute_deprecated int prediction_order_method;
2593 * - encoding: Set by user.
2594 * - decoding: unused
2596 attribute_deprecated int min_partition_order;
2599 * - encoding: Set by user.
2600 * - decoding: unused
2602 attribute_deprecated int max_partition_order;
2609 * GOP timecode frame start number, in non drop frame format
2610 * - encoding: Set by user.
2611 * - decoding: unused
2613 int64_t timecode_frame_start;
2615 #if FF_API_REQUEST_CHANNELS
2617 * Decoder should decode to this many channels if it can (0 for default)
2618 * - encoding: unused
2619 * - decoding: Set by user.
2620 * @deprecated Deprecated in favor of request_channel_layout.
2622 int request_channels;
2625 #if FF_API_DRC_SCALE
2627 * Percentage of dynamic range compression to be applied by the decoder.
2628 * The default value is 1.0, corresponding to full compression.
2629 * - encoding: unused
2630 * - decoding: Set by user.
2631 * @deprecated use AC3 decoder private option instead.
2633 attribute_deprecated float drc_scale;
2637 * opaque 64bit number (generally a PTS) that will be reordered and
2638 * output in AVFrame.reordered_opaque
2639 * @deprecated in favor of pkt_pts
2640 * - encoding: unused
2641 * - decoding: Set by user.
2643 int64_t reordered_opaque;
2646 * Bits per sample/pixel of internal libavcodec pixel/sample format.
2647 * - encoding: set by user.
2648 * - decoding: set by libavcodec.
2650 int bits_per_raw_sample;
2653 * Audio channel layout.
2654 * - encoding: set by user.
2655 * - decoding: set by user, may be overwritten by libavcodec.
2657 int64_t channel_layout;
2660 * Request decoder to use this channel layout if it can (0 for default)
2661 * - encoding: unused
2662 * - decoding: Set by user.
2664 int64_t request_channel_layout;
2667 * Ratecontrol attempt to use, at maximum, <value> of what can be used without an underflow.
2668 * - encoding: Set by user.
2669 * - decoding: unused.
2671 float rc_max_available_vbv_use;
2674 * Ratecontrol attempt to use, at least, <value> times the amount needed to prevent a vbv overflow.
2675 * - encoding: Set by user.
2676 * - decoding: unused.
2678 float rc_min_vbv_overflow_use;
2681 * Hardware accelerator in use
2682 * - encoding: unused.
2683 * - decoding: Set by libavcodec
2685 struct AVHWAccel *hwaccel;
2688 * For some codecs, the time base is closer to the field rate than the frame rate.
2689 * Most notably, H.264 and MPEG-2 specify time_base as half of frame duration
2690 * if no telecine is used ...
2692 * Set to time_base ticks per frame. Default 1, e.g., H.264/MPEG-2 set it to 2.
2694 int ticks_per_frame;
2697 * Hardware accelerator context.
2698 * For some hardware accelerators, a global context needs to be
2699 * provided by the user. In that case, this holds display-dependent
2700 * data FFmpeg cannot instantiate itself. Please refer to the
2701 * FFmpeg HW accelerator documentation to know how to fill this
2702 * is. e.g. for VA API, this is a struct vaapi_context.
2703 * - encoding: unused
2704 * - decoding: Set by user
2706 void *hwaccel_context;
2709 * Chromaticity coordinates of the source primaries.
2710 * - encoding: Set by user
2711 * - decoding: Set by libavcodec
2713 enum AVColorPrimaries color_primaries;
2716 * Color Transfer Characteristic.
2717 * - encoding: Set by user
2718 * - decoding: Set by libavcodec
2720 enum AVColorTransferCharacteristic color_trc;
2723 * YUV colorspace type.
2724 * - encoding: Set by user
2725 * - decoding: Set by libavcodec
2727 enum AVColorSpace colorspace;
2730 * MPEG vs JPEG YUV range.
2731 * - encoding: Set by user
2732 * - decoding: Set by libavcodec
2734 enum AVColorRange color_range;
2737 * This defines the location of chroma samples.
2738 * - encoding: Set by user
2739 * - decoding: Set by libavcodec
2741 enum AVChromaLocation chroma_sample_location;
2744 * The codec may call this to execute several independent things.
2745 * It will return only after finishing all tasks.
2746 * The user may replace this with some multithreaded implementation,
2747 * the default implementation will execute the parts serially.
2748 * Also see avcodec_thread_init and e.g. the --enable-pthread configure option.
2749 * @param c context passed also to func
2750 * @param count the number of things to execute
2751 * @param arg2 argument passed unchanged to func
2752 * @param ret return values of executed functions, must have space for "count" values. May be NULL.
2753 * @param func function that will be called count times, with jobnr from 0 to count-1.
2754 * threadnr will be in the range 0 to c->thread_count-1 < MAX_THREADS and so that no
2755 * two instances of func executing at the same time will have the same threadnr.
2756 * @return always 0 currently, but code should handle a future improvement where when any call to func
2757 * returns < 0 no further calls to func may be done and < 0 is returned.
2758 * - encoding: Set by libavcodec, user can override.
2759 * - decoding: Set by libavcodec, user can override.
2761 int (*execute2)(struct AVCodecContext *c, int (*func)(struct AVCodecContext *c2, void *arg, int jobnr, int threadnr), void *arg2, int *ret, int count);
2763 #if FF_API_X264_GLOBAL_OPTS
2765 * explicit P-frame weighted prediction analysis method
2767 * 1: fast blind weighting (one reference duplicate with -1 offset)
2768 * 2: smart weighting (full fade detection analysis)
2769 * - encoding: Set by user.
2770 * - decoding: unused
2772 attribute_deprecated int weighted_p_pred;
2777 * 1: Variance AQ (complexity mask)
2778 * 2: Auto-variance AQ (experimental)
2779 * - encoding: Set by user
2780 * - decoding: unused
2782 attribute_deprecated int aq_mode;
2786 * Reduces blocking and blurring in flat and textured areas.
2787 * - encoding: Set by user
2788 * - decoding: unused
2790 attribute_deprecated float aq_strength;
2794 * Strength of psychovisual optimization
2795 * - encoding: Set by user
2796 * - decoding: unused
2798 attribute_deprecated float psy_rd;
2802 * Strength of psychovisual optimization
2803 * - encoding: Set by user
2804 * - decoding: unused
2806 attribute_deprecated float psy_trellis;
2810 * Number of frames for frametype and ratecontrol lookahead
2811 * - encoding: Set by user
2812 * - decoding: unused
2814 attribute_deprecated int rc_lookahead;
2817 * Constant rate factor maximum
2818 * With CRF encoding mode and VBV restrictions enabled, prevents quality from being worse
2819 * than crf_max, even if doing so would violate VBV restrictions.
2820 * - encoding: Set by user.
2821 * - decoding: unused
2823 attribute_deprecated float crf_max;
2826 int log_level_offset;
2828 #if FF_API_FLAC_GLOBAL_OPTS
2830 * Determines which LPC analysis algorithm to use.
2831 * - encoding: Set by user
2832 * - decoding: unused
2834 attribute_deprecated enum AVLPCType lpc_type;
2837 * Number of passes to use for Cholesky factorization during LPC analysis
2838 * - encoding: Set by user
2839 * - decoding: unused
2841 attribute_deprecated int lpc_passes;
2846 * Indicates number of picture subdivisions. Used for parallelized
2848 * - encoding: Set by user
2849 * - decoding: unused
2854 * Header containing style information for text subtitles.
2855 * For SUBTITLE_ASS subtitle type, it should contain the whole ASS
2856 * [Script Info] and [V4+ Styles] section, plus the [Events] line and
2857 * the Format line following. It shouldn't include any Dialogue line.
2858 * - encoding: Set/allocated/freed by user (before avcodec_open())
2859 * - decoding: Set/allocated/freed by libavcodec (by avcodec_open())
2861 uint8_t *subtitle_header;
2862 int subtitle_header_size;
2865 * Current packet as passed into the decoder, to avoid having
2866 * to pass the packet into every function. Currently only valid
2867 * inside lavc and get/release_buffer callbacks.
2868 * - decoding: set by avcodec_decode_*, read by get_buffer() for setting pkt_pts
2869 * - encoding: unused
2874 * Whether this is a copy of the context which had init() called on it.
2875 * This is used by multithreading - shared tables and picture pointers
2876 * should be freed from the original context only.
2877 * - encoding: Set by libavcodec.
2878 * - decoding: Set by libavcodec.
2883 * Which multithreading methods to use.
2884 * Use of FF_THREAD_FRAME will increase decoding delay by one frame per thread,
2885 * so clients which cannot provide future frames should not use it.
2887 * - encoding: Set by user, otherwise the default is used.
2888 * - decoding: Set by user, otherwise the default is used.
2891 #define FF_THREAD_FRAME 1 ///< Decode more than one frame at once
2892 #define FF_THREAD_SLICE 2 ///< Decode more than one part of a single frame at once
2895 * Which multithreading methods are in use by the codec.
2896 * - encoding: Set by libavcodec.
2897 * - decoding: Set by libavcodec.
2899 int active_thread_type;
2902 * Set by the client if its custom get_buffer() callback can be called
2903 * from another thread, which allows faster multithreaded decoding.
2904 * draw_horiz_band() will be called from other threads regardless of this setting.
2905 * Ignored if the default get_buffer() is used.
2906 * - encoding: Set by user.
2907 * - decoding: Set by user.
2909 int thread_safe_callbacks;
2912 * VBV delay coded in the last frame (in periods of a 27 MHz clock).
2913 * Used for compliant TS muxing.
2914 * - encoding: Set by libavcodec.
2915 * - decoding: unused.
2920 * Type of service that the audio stream conveys.
2921 * - encoding: Set by user.
2922 * - decoding: Set by libavcodec.
2924 enum AVAudioServiceType audio_service_type;
2927 * desired sample format
2928 * - encoding: Not used.
2929 * - decoding: Set by user.
2930 * Decoder will decode to this format if it can.
2932 enum AVSampleFormat request_sample_fmt;
2935 * Current statistics for PTS correction.
2936 * - decoding: maintained and used by libavcodec, not intended to be used by user apps
2937 * - encoding: unused
2939 int64_t pts_correction_num_faulty_pts; /// Number of incorrect PTS values so far
2940 int64_t pts_correction_num_faulty_dts; /// Number of incorrect DTS values so far
2941 int64_t pts_correction_last_pts; /// PTS of the last frame
2942 int64_t pts_correction_last_dts; /// DTS of the last frame
2950 typedef struct AVProfile {
2952 const char *name; ///< short name for the profile
2955 typedef struct AVCodecDefault AVCodecDefault;
2960 typedef struct AVCodec {
2962 * Name of the codec implementation.
2963 * The name is globally unique among encoders and among decoders (but an
2964 * encoder and a decoder can share the same name).
2965 * This is the primary way to find a codec from the user perspective.
2968 enum AVMediaType type;
2971 int (*init)(AVCodecContext *);
2972 int (*encode)(AVCodecContext *, uint8_t *buf, int buf_size, void *data);
2973 int (*close)(AVCodecContext *);
2974 int (*decode)(AVCodecContext *, void *outdata, int *outdata_size, AVPacket *avpkt);
2976 * Codec capabilities.
2980 struct AVCodec *next;
2983 * Will be called when seeking
2985 void (*flush)(AVCodecContext *);
2986 const AVRational *supported_framerates; ///< array of supported framerates, or NULL if any, array is terminated by {0,0}
2987 const enum PixelFormat *pix_fmts; ///< array of supported pixel formats, or NULL if unknown, array is terminated by -1
2989 * Descriptive name for the codec, meant to be more human readable than name.
2990 * You should use the NULL_IF_CONFIG_SMALL() macro to define it.
2992 const char *long_name;
2993 const int *supported_samplerates; ///< array of supported audio samplerates, or NULL if unknown, array is terminated by 0
2994 const enum AVSampleFormat *sample_fmts; ///< array of supported sample formats, or NULL if unknown, array is terminated by -1
2995 const int64_t *channel_layouts; ///< array of support channel layouts, or NULL if unknown. array is terminated by 0
2996 uint8_t max_lowres; ///< maximum value for lowres supported by the decoder
2997 const AVClass *priv_class; ///< AVClass for the private context
2998 const AVProfile *profiles; ///< array of recognized profiles, or NULL if unknown, array is terminated by {FF_PROFILE_UNKNOWN}
3001 * @name Frame-level threading support functions
3005 * If defined, called on thread contexts when they are created.
3006 * If the codec allocates writable tables in init(), re-allocate them here.
3007 * priv_data will be set to a copy of the original.
3009 int (*init_thread_copy)(AVCodecContext *);
3011 * Copy necessary context variables from a previous thread context to the current one.
3012 * If not defined, the next thread will start automatically; otherwise, the codec
3013 * must call ff_thread_finish_setup().
3015 * dst and src will (rarely) point to the same context, in which case memcpy should be skipped.
3017 int (*update_thread_context)(AVCodecContext *dst, const AVCodecContext *src);
3021 * Private codec-specific defaults.
3023 const AVCodecDefault *defaults;
3029 typedef struct AVHWAccel {
3031 * Name of the hardware accelerated codec.
3032 * The name is globally unique among encoders and among decoders (but an
3033 * encoder and a decoder can share the same name).
3038 * Type of codec implemented by the hardware accelerator.
3040 * See AVMEDIA_TYPE_xxx
3042 enum AVMediaType type;
3045 * Codec implemented by the hardware accelerator.
3052 * Supported pixel format.
3054 * Only hardware accelerated formats are supported here.
3056 enum PixelFormat pix_fmt;
3059 * Hardware accelerated codec capabilities.
3060 * see FF_HWACCEL_CODEC_CAP_*
3064 struct AVHWAccel *next;
3067 * Called at the beginning of each frame or field picture.
3069 * Meaningful frame information (codec specific) is guaranteed to
3070 * be parsed at this point. This function is mandatory.
3072 * Note that buf can be NULL along with buf_size set to 0.
3073 * Otherwise, this means the whole frame is available at this point.
3075 * @param avctx the codec context
3076 * @param buf the frame data buffer base
3077 * @param buf_size the size of the frame in bytes
3078 * @return zero if successful, a negative value otherwise
3080 int (*start_frame)(AVCodecContext *avctx, const uint8_t *buf, uint32_t buf_size);
3083 * Callback for each slice.
3085 * Meaningful slice information (codec specific) is guaranteed to
3086 * be parsed at this point. This function is mandatory.
3088 * @param avctx the codec context
3089 * @param buf the slice data buffer base
3090 * @param buf_size the size of the slice in bytes
3091 * @return zero if successful, a negative value otherwise
3093 int (*decode_slice)(AVCodecContext *avctx, const uint8_t *buf, uint32_t buf_size);
3096 * Called at the end of each frame or field picture.
3098 * The whole picture is parsed at this point and can now be sent
3099 * to the hardware accelerator. This function is mandatory.
3101 * @param avctx the codec context
3102 * @return zero if successful, a negative value otherwise
3104 int (*end_frame)(AVCodecContext *avctx);
3107 * Size of HW accelerator private data.
3109 * Private data is allocated with av_mallocz() before
3110 * AVCodecContext.get_buffer() and deallocated after
3111 * AVCodecContext.release_buffer().
3117 * four components are given, that's all.
3118 * the last component is alpha
3120 typedef struct AVPicture {
3122 int linesize[4]; ///< number of bytes per line
3125 #if FF_API_PALETTE_CONTROL
3128 * This structure defines a method for communicating palette changes
3129 * between and demuxer and a decoder.
3131 * @deprecated Use AVPacket to send palette changes instead.
3132 * This is totally broken.
3134 #define AVPALETTE_SIZE 1024
3135 #define AVPALETTE_COUNT 256
3136 typedef struct AVPaletteControl {
3138 /* Demuxer sets this to 1 to indicate the palette has changed;
3139 * decoder resets to 0. */
3140 int palette_changed;
3142 /* 4-byte ARGB palette entries, stored in native byte order; note that
3143 * the individual palette components should be on a 8-bit scale; if
3144 * the palette data comes from an IBM VGA native format, the component
3145 * data is probably 6 bits in size and needs to be scaled. */
3146 unsigned int palette[AVPALETTE_COUNT];
3148 } AVPaletteControl attribute_deprecated;
3151 enum AVSubtitleType {
3154 SUBTITLE_BITMAP, ///< A bitmap, pict will be set
3157 * Plain text, the text field must be set by the decoder and is
3158 * authoritative. ass and pict fields may contain approximations.
3163 * Formatted text, the ass field must be set by the decoder and is
3164 * authoritative. pict and text fields may contain approximations.
3169 typedef struct AVSubtitleRect {
3170 int x; ///< top left corner of pict, undefined when pict is not set
3171 int y; ///< top left corner of pict, undefined when pict is not set
3172 int w; ///< width of pict, undefined when pict is not set
3173 int h; ///< height of pict, undefined when pict is not set
3174 int nb_colors; ///< number of colors in pict, undefined when pict is not set
3177 * data+linesize for the bitmap of this subtitle.
3178 * can be set for text/ass as well once they where rendered
3181 enum AVSubtitleType type;
3183 char *text; ///< 0 terminated plain UTF-8 text
3186 * 0 terminated ASS/SSA compatible event line.
3187 * The pressentation of this is unaffected by the other values in this
3193 typedef struct AVSubtitle {
3194 uint16_t format; /* 0 = graphics */
3195 uint32_t start_display_time; /* relative to packet pts, in ms */
3196 uint32_t end_display_time; /* relative to packet pts, in ms */
3198 AVSubtitleRect **rects;
3199 int64_t pts; ///< Same as packet pts, in AV_TIME_BASE
3202 /* packet functions */
3205 * @deprecated use NULL instead
3207 attribute_deprecated void av_destruct_packet_nofree(AVPacket *pkt);
3210 * Default packet destructor.
3212 void av_destruct_packet(AVPacket *pkt);
3215 * Initialize optional fields of a packet with default values.
3219 void av_init_packet(AVPacket *pkt);
3222 * Allocate the payload of a packet and initialize its fields with
3226 * @param size wanted payload size
3227 * @return 0 if OK, AVERROR_xxx otherwise
3229 int av_new_packet(AVPacket *pkt, int size);
3232 * Reduce packet size, correctly zeroing padding
3235 * @param size new size
3237 void av_shrink_packet(AVPacket *pkt, int size);
3240 * Increase packet size, correctly zeroing padding
3243 * @param grow_by number of bytes by which to increase the size of the packet
3245 int av_grow_packet(AVPacket *pkt, int grow_by);
3248 * @warning This is a hack - the packet memory allocation stuff is broken. The
3249 * packet is allocated if it was not really allocated.
3251 int av_dup_packet(AVPacket *pkt);
3256 * @param pkt packet to free
3258 void av_free_packet(AVPacket *pkt);
3261 * Allocate new information of a packet.
3264 * @param type side information type
3265 * @param size side information size
3266 * @return pointer to fresh allocated data or NULL otherwise
3268 uint8_t* av_packet_new_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
3272 * Get side information from packet.
3275 * @param type desired side information type
3276 * @param size pointer for side information size to store (optional)
3277 * @return pointer to data if present or NULL otherwise
3279 uint8_t* av_packet_get_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
3282 int av_packet_merge_side_data(AVPacket *pkt);
3284 int av_packet_split_side_data(AVPacket *pkt);
3289 struct ReSampleContext;
3290 struct AVResampleContext;
3292 typedef struct ReSampleContext ReSampleContext;
3295 * Initialize audio resampling context.
3297 * @param output_channels number of output channels
3298 * @param input_channels number of input channels
3299 * @param output_rate output sample rate
3300 * @param input_rate input sample rate
3301 * @param sample_fmt_out requested output sample format
3302 * @param sample_fmt_in input sample format
3303 * @param filter_length length of each FIR filter in the filterbank relative to the cutoff frequency
3304 * @param log2_phase_count log2 of the number of entries in the polyphase filterbank
3305 * @param linear if 1 then the used FIR filter will be linearly interpolated
3306 between the 2 closest, if 0 the closest will be used
3307 * @param cutoff cutoff frequency, 1.0 corresponds to half the output sampling rate
3308 * @return allocated ReSampleContext, NULL if error occured
3310 ReSampleContext *av_audio_resample_init(int output_channels, int input_channels,
3311 int output_rate, int input_rate,
3312 enum AVSampleFormat sample_fmt_out,
3313 enum AVSampleFormat sample_fmt_in,
3314 int filter_length, int log2_phase_count,
3315 int linear, double cutoff);
3317 int audio_resample(ReSampleContext *s, short *output, short *input, int nb_samples);
3320 * Free resample context.
3322 * @param s a non-NULL pointer to a resample context previously
3323 * created with av_audio_resample_init()
3325 void audio_resample_close(ReSampleContext *s);
3329 * Initialize an audio resampler.
3330 * Note, if either rate is not an integer then simply scale both rates up so they are.
3331 * @param filter_length length of each FIR filter in the filterbank relative to the cutoff freq
3332 * @param log2_phase_count log2 of the number of entries in the polyphase filterbank
3333 * @param linear If 1 then the used FIR filter will be linearly interpolated
3334 between the 2 closest, if 0 the closest will be used
3335 * @param cutoff cutoff frequency, 1.0 corresponds to half the output sampling rate
3337 struct AVResampleContext *av_resample_init(int out_rate, int in_rate, int filter_length, int log2_phase_count, int linear, double cutoff);
3340 * Resample an array of samples using a previously configured context.
3341 * @param src an array of unconsumed samples
3342 * @param consumed the number of samples of src which have been consumed are returned here
3343 * @param src_size the number of unconsumed samples available
3344 * @param dst_size the amount of space in samples available in dst
3345 * @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.
3346 * @return the number of samples written in dst or -1 if an error occurred
3348 int av_resample(struct AVResampleContext *c, short *dst, short *src, int *consumed, int src_size, int dst_size, int update_ctx);
3352 * Compensate samplerate/timestamp drift. The compensation is done by changing
3353 * the resampler parameters, so no audible clicks or similar distortions occur
3354 * @param compensation_distance distance in output samples over which the compensation should be performed
3355 * @param sample_delta number of output samples which should be output less
3357 * example: av_resample_compensate(c, 10, 500)
3358 * here instead of 510 samples only 500 samples would be output
3360 * note, due to rounding the actual compensation might be slightly different,
3361 * especially if the compensation_distance is large and the in_rate used during init is small
3363 void av_resample_compensate(struct AVResampleContext *c, int sample_delta, int compensation_distance);
3364 void av_resample_close(struct AVResampleContext *c);
3367 * Allocate memory for a picture. Call avpicture_free() to free it.
3369 * @see avpicture_fill()
3371 * @param picture the picture to be filled in
3372 * @param pix_fmt the format of the picture
3373 * @param width the width of the picture
3374 * @param height the height of the picture
3375 * @return zero if successful, a negative value if not
3377 int avpicture_alloc(AVPicture *picture, enum PixelFormat pix_fmt, int width, int height);
3380 * Free a picture previously allocated by avpicture_alloc().
3381 * The data buffer used by the AVPicture is freed, but the AVPicture structure
3384 * @param picture the AVPicture to be freed
3386 void avpicture_free(AVPicture *picture);
3389 * Fill in the AVPicture fields.
3390 * The fields of the given AVPicture are filled in by using the 'ptr' address
3391 * which points to the image data buffer. Depending on the specified picture
3392 * format, one or multiple image data pointers and line sizes will be set.
3393 * If a planar format is specified, several pointers will be set pointing to
3394 * the different picture planes and the line sizes of the different planes
3395 * will be stored in the lines_sizes array.
3396 * Call with ptr == NULL to get the required size for the ptr buffer.
3398 * To allocate the buffer and fill in the AVPicture fields in one call,
3399 * use avpicture_alloc().
3401 * @param picture AVPicture whose fields are to be filled in
3402 * @param ptr Buffer which will contain or contains the actual image data
3403 * @param pix_fmt The format in which the picture data is stored.
3404 * @param width the width of the image in pixels
3405 * @param height the height of the image in pixels
3406 * @return size of the image data in bytes
3408 int avpicture_fill(AVPicture *picture, uint8_t *ptr,
3409 enum PixelFormat pix_fmt, int width, int height);
3412 * Copy pixel data from an AVPicture into a buffer.
3413 * The data is stored compactly, without any gaps for alignment or padding
3414 * which may be applied by avpicture_fill().
3416 * @see avpicture_get_size()
3418 * @param[in] src AVPicture containing image data
3419 * @param[in] pix_fmt The format in which the picture data is stored.
3420 * @param[in] width the width of the image in pixels.
3421 * @param[in] height the height of the image in pixels.
3422 * @param[out] dest A buffer into which picture data will be copied.
3423 * @param[in] dest_size The size of 'dest'.
3424 * @return The number of bytes written to dest, or a negative value (error code) on error.
3426 int avpicture_layout(const AVPicture* src, enum PixelFormat pix_fmt, int width, int height,
3427 unsigned char *dest, int dest_size);
3430 * Calculate the size in bytes that a picture of the given width and height
3431 * would occupy if stored in the given picture format.
3432 * Note that this returns the size of a compact representation as generated
3433 * by avpicture_layout(), which can be smaller than the size required for e.g.
3436 * @param pix_fmt the given picture format
3437 * @param width the width of the image
3438 * @param height the height of the image
3439 * @return Image data size in bytes or -1 on error (e.g. too large dimensions).
3441 int avpicture_get_size(enum PixelFormat pix_fmt, int width, int height);
3442 void avcodec_get_chroma_sub_sample(enum PixelFormat pix_fmt, int *h_shift, int *v_shift);
3445 * Get the name of a codec.
3446 * @return a static string identifying the codec; never NULL
3448 const char *avcodec_get_name(enum CodecID id);
3450 #if FF_API_GET_PIX_FMT_NAME
3452 * Return the short name for a pixel format.
3454 * \see av_get_pix_fmt(), av_get_pix_fmt_string().
3455 * @deprecated Deprecated in favor of av_get_pix_fmt_name().
3457 attribute_deprecated
3458 const char *avcodec_get_pix_fmt_name(enum PixelFormat pix_fmt);
3461 void avcodec_set_dimensions(AVCodecContext *s, int width, int height);
3464 * Return a value representing the fourCC code associated to the
3465 * pixel format pix_fmt, or 0 if no associated fourCC code can be
3468 unsigned int avcodec_pix_fmt_to_codec_tag(enum PixelFormat pix_fmt);
3471 * Put a string representing the codec tag codec_tag in buf.
3473 * @param buf_size size in bytes of buf
3474 * @return the length of the string that would have been generated if
3475 * enough space had been available, excluding the trailing null
3477 size_t av_get_codec_tag_string(char *buf, size_t buf_size, unsigned int codec_tag);
3479 #define FF_LOSS_RESOLUTION 0x0001 /**< loss due to resolution change */
3480 #define FF_LOSS_DEPTH 0x0002 /**< loss due to color depth change */
3481 #define FF_LOSS_COLORSPACE 0x0004 /**< loss due to color space conversion */
3482 #define FF_LOSS_ALPHA 0x0008 /**< loss of alpha bits */
3483 #define FF_LOSS_COLORQUANT 0x0010 /**< loss due to color quantization */
3484 #define FF_LOSS_CHROMA 0x0020 /**< loss of chroma (e.g. RGB to gray conversion) */
3487 * Compute what kind of losses will occur when converting from one specific
3488 * pixel format to another.
3489 * When converting from one pixel format to another, information loss may occur.
3490 * For example, when converting from RGB24 to GRAY, the color information will
3491 * be lost. Similarly, other losses occur when converting from some formats to
3492 * other formats. These losses can involve loss of chroma, but also loss of
3493 * resolution, loss of color depth, loss due to the color space conversion, loss
3494 * of the alpha bits or loss due to color quantization.
3495 * avcodec_get_fix_fmt_loss() informs you about the various types of losses
3496 * which will occur when converting from one pixel format to another.
3498 * @param[in] dst_pix_fmt destination pixel format
3499 * @param[in] src_pix_fmt source pixel format
3500 * @param[in] has_alpha Whether the source pixel format alpha channel is used.
3501 * @return Combination of flags informing you what kind of losses will occur
3502 * (maximum loss for an invalid dst_pix_fmt).
3504 int avcodec_get_pix_fmt_loss(enum PixelFormat dst_pix_fmt, enum PixelFormat src_pix_fmt,
3508 * Find the best pixel format to convert to given a certain source pixel
3509 * format. When converting from one pixel format to another, information loss
3510 * may occur. For example, when converting from RGB24 to GRAY, the color
3511 * information will be lost. Similarly, other losses occur when converting from
3512 * some formats to other formats. avcodec_find_best_pix_fmt() searches which of
3513 * the given pixel formats should be used to suffer the least amount of loss.
3514 * The pixel formats from which it chooses one, are determined by the
3515 * pix_fmt_mask parameter.
3517 * Note, only the first 64 pixel formats will fit in pix_fmt_mask.
3520 * src_pix_fmt = PIX_FMT_YUV420P;
3521 * pix_fmt_mask = (1 << PIX_FMT_YUV422P) | (1 << PIX_FMT_RGB24);
3522 * dst_pix_fmt = avcodec_find_best_pix_fmt(pix_fmt_mask, src_pix_fmt, alpha, &loss);
3525 * @param[in] pix_fmt_mask bitmask determining which pixel format to choose from
3526 * @param[in] src_pix_fmt source pixel format
3527 * @param[in] has_alpha Whether the source pixel format alpha channel is used.
3528 * @param[out] loss_ptr Combination of flags informing you what kind of losses will occur.
3529 * @return The best pixel format to convert to or -1 if none was found.
3531 enum PixelFormat avcodec_find_best_pix_fmt(int64_t pix_fmt_mask, enum PixelFormat src_pix_fmt,
3532 int has_alpha, int *loss_ptr);
3534 #define FF_ALPHA_TRANSP 0x0001 /* image has some totally transparent pixels */
3535 #define FF_ALPHA_SEMI_TRANSP 0x0002 /* image has some transparent pixels */
3538 * Tell if an image really has transparent alpha values.
3539 * @return ored mask of FF_ALPHA_xxx constants
3541 int img_get_alpha_info(const AVPicture *src,
3542 enum PixelFormat pix_fmt, int width, int height);
3544 /* deinterlace a picture */
3545 /* deinterlace - if not supported return -1 */
3546 int avpicture_deinterlace(AVPicture *dst, const AVPicture *src,
3547 enum PixelFormat pix_fmt, int width, int height);
3549 /* external high level API */
3552 * If c is NULL, returns the first registered codec,
3553 * if c is non-NULL, returns the next registered codec after c,
3554 * or NULL if c is the last one.
3556 AVCodec *av_codec_next(AVCodec *c);
3559 * Return the LIBAVCODEC_VERSION_INT constant.
3561 unsigned avcodec_version(void);
3564 * Return the libavcodec build-time configuration.
3566 const char *avcodec_configuration(void);
3569 * Return the libavcodec license.
3571 const char *avcodec_license(void);
3573 #if FF_API_AVCODEC_INIT
3575 * @deprecated this function is called automatically from avcodec_register()
3576 * and avcodec_register_all(), there is no need to call it manually
3578 attribute_deprecated
3579 void avcodec_init(void);
3583 * Register the codec codec and initialize libavcodec.
3585 * @warning either this function or avcodec_register_all() must be called
3586 * before any other libavcodec functions.
3588 * @see avcodec_register_all()
3590 void avcodec_register(AVCodec *codec);
3593 * Find a registered encoder with a matching codec ID.
3595 * @param id CodecID of the requested encoder
3596 * @return An encoder if one was found, NULL otherwise.
3598 AVCodec *avcodec_find_encoder(enum CodecID id);
3601 * Find a registered encoder with the specified name.
3603 * @param name name of the requested encoder
3604 * @return An encoder if one was found, NULL otherwise.
3606 AVCodec *avcodec_find_encoder_by_name(const char *name);
3609 * Find a registered decoder with a matching codec ID.
3611 * @param id CodecID of the requested decoder
3612 * @return A decoder if one was found, NULL otherwise.
3614 AVCodec *avcodec_find_decoder(enum CodecID id);
3617 * Find a registered decoder with the specified name.
3619 * @param name name of the requested decoder
3620 * @return A decoder if one was found, NULL otherwise.
3622 AVCodec *avcodec_find_decoder_by_name(const char *name);
3623 void avcodec_string(char *buf, int buf_size, AVCodecContext *enc, int encode);
3626 * Return a name for the specified profile, if available.
3628 * @param codec the codec that is searched for the given profile
3629 * @param profile the profile value for which a name is requested
3630 * @return A name for the profile if found, NULL otherwise.
3632 const char *av_get_profile_name(const AVCodec *codec, int profile);
3635 * Set the fields of the given AVCodecContext to default values.
3637 * @param s The AVCodecContext of which the fields should be set to default values.
3639 void avcodec_get_context_defaults(AVCodecContext *s);
3641 /** THIS FUNCTION IS NOT YET PART OF THE PUBLIC API!
3642 * we WILL change its arguments and name a few times! */
3643 void avcodec_get_context_defaults2(AVCodecContext *s, enum AVMediaType);
3645 /** THIS FUNCTION IS NOT YET PART OF THE PUBLIC API!
3646 * we WILL change its arguments and name a few times! */
3647 int avcodec_get_context_defaults3(AVCodecContext *s, AVCodec *codec);
3649 #if FF_API_ALLOC_CONTEXT
3651 * Allocate an AVCodecContext and set its fields to default values. The
3652 * resulting struct can be deallocated by simply calling av_free().
3654 * @return An AVCodecContext filled with default values or NULL on failure.
3655 * @see avcodec_get_context_defaults
3657 * @deprecated use avcodec_alloc_context3()
3659 attribute_deprecated
3660 AVCodecContext *avcodec_alloc_context(void);
3662 /** THIS FUNCTION IS NOT YET PART OF THE PUBLIC API!
3663 * we WILL change its arguments and name a few times! */
3664 attribute_deprecated
3665 AVCodecContext *avcodec_alloc_context2(enum AVMediaType);
3669 * Allocate an AVCodecContext and set its fields to default values. The
3670 * resulting struct can be deallocated by simply calling av_free().
3672 * @param codec if non-NULL, allocate private data and initialize defaults
3673 * for the given codec. It is illegal to then call avcodec_open()
3674 * with a different codec.
3676 * @return An AVCodecContext filled with default values or NULL on failure.
3677 * @see avcodec_get_context_defaults
3679 * @deprecated use avcodec_alloc_context3()
3681 AVCodecContext *avcodec_alloc_context3(AVCodec *codec);
3684 * Copy the settings of the source AVCodecContext into the destination
3685 * AVCodecContext. The resulting destination codec context will be
3686 * unopened, i.e. you are required to call avcodec_open() before you
3687 * can use this AVCodecContext to decode/encode video/audio data.
3689 * @param dest target codec context, should be initialized with
3690 * avcodec_alloc_context3(), but otherwise uninitialized
3691 * @param src source codec context
3692 * @return AVERROR() on error (e.g. memory allocation error), 0 on success
3694 int avcodec_copy_context(AVCodecContext *dest, const AVCodecContext *src);
3697 * Set the fields of the given AVFrame to default values.
3699 * @param pic The AVFrame of which the fields should be set to default values.
3701 void avcodec_get_frame_defaults(AVFrame *pic);
3704 * Allocate an AVFrame and set its fields to default values. The resulting
3705 * struct can be deallocated by simply calling av_free().
3707 * @return An AVFrame filled with default values or NULL on failure.
3708 * @see avcodec_get_frame_defaults
3710 AVFrame *avcodec_alloc_frame(void);
3712 int avcodec_default_get_buffer(AVCodecContext *s, AVFrame *pic);
3713 void avcodec_default_release_buffer(AVCodecContext *s, AVFrame *pic);
3714 int avcodec_default_reget_buffer(AVCodecContext *s, AVFrame *pic);
3717 * Return the amount of padding in pixels which the get_buffer callback must
3718 * provide around the edge of the image for codecs which do not have the
3719 * CODEC_FLAG_EMU_EDGE flag.
3721 * @return Required padding in pixels.
3723 unsigned avcodec_get_edge_width(void);
3725 * Modify width and height values so that they will result in a memory
3726 * buffer that is acceptable for the codec if you do not use any horizontal
3729 * May only be used if a codec with CODEC_CAP_DR1 has been opened.
3730 * If CODEC_FLAG_EMU_EDGE is not set, the dimensions must have been increased
3731 * according to avcodec_get_edge_width() before.
3733 void avcodec_align_dimensions(AVCodecContext *s, int *width, int *height);
3735 * Modify width and height values so that they will result in a memory
3736 * buffer that is acceptable for the codec if you also ensure that all
3737 * line sizes are a multiple of the respective linesize_align[i].
3739 * May only be used if a codec with CODEC_CAP_DR1 has been opened.
3740 * If CODEC_FLAG_EMU_EDGE is not set, the dimensions must have been increased
3741 * according to avcodec_get_edge_width() before.
3743 void avcodec_align_dimensions2(AVCodecContext *s, int *width, int *height,
3744 int linesize_align[4]);
3746 enum PixelFormat avcodec_default_get_format(struct AVCodecContext *s, const enum PixelFormat * fmt);
3748 #if FF_API_THREAD_INIT
3750 * @deprecated Set s->thread_count before calling avcodec_open() instead of calling this.
3752 attribute_deprecated
3753 int avcodec_thread_init(AVCodecContext *s, int thread_count);
3756 int avcodec_default_execute(AVCodecContext *c, int (*func)(AVCodecContext *c2, void *arg2),void *arg, int *ret, int count, int size);
3757 int avcodec_default_execute2(AVCodecContext *c, int (*func)(AVCodecContext *c2, void *arg2, int, int),void *arg, int *ret, int count);
3758 //FIXME func typedef
3760 #if FF_API_AVCODEC_OPEN
3762 * Initialize the AVCodecContext to use the given AVCodec. Prior to using this
3763 * function the context has to be allocated.
3765 * The functions avcodec_find_decoder_by_name(), avcodec_find_encoder_by_name(),
3766 * avcodec_find_decoder() and avcodec_find_encoder() provide an easy way for
3767 * retrieving a codec.
3769 * @warning This function is not thread safe!
3772 * avcodec_register_all();
3773 * codec = avcodec_find_decoder(CODEC_ID_H264);
3777 * context = avcodec_alloc_context3(codec);
3779 * if (avcodec_open(context, codec) < 0)
3783 * @param avctx The context which will be set up to use the given codec.
3784 * @param codec The codec to use within the context.
3785 * @return zero on success, a negative value on error
3786 * @see avcodec_alloc_context3, avcodec_find_decoder, avcodec_find_encoder, avcodec_close
3788 * @deprecated use avcodec_open2
3790 attribute_deprecated
3791 int avcodec_open(AVCodecContext *avctx, AVCodec *codec);
3795 * Initialize the AVCodecContext to use the given AVCodec. Prior to using this
3796 * function the context has to be allocated with avcodec_alloc_context().
3798 * The functions avcodec_find_decoder_by_name(), avcodec_find_encoder_by_name(),
3799 * avcodec_find_decoder() and avcodec_find_encoder() provide an easy way for
3800 * retrieving a codec.
3802 * @warning This function is not thread safe!
3805 * avcodec_register_all();
3806 * av_dict_set(&opts, "b", "2.5M", 0);
3807 * codec = avcodec_find_decoder(CODEC_ID_H264);
3811 * context = avcodec_alloc_context();
3813 * if (avcodec_open(context, codec, opts) < 0)
3817 * @param avctx The context to initialize.
3818 * @param options A dictionary filled with AVCodecContext and codec-private options.
3819 * On return this object will be filled with options that were not found.
3821 * @return zero on success, a negative value on error
3822 * @see avcodec_alloc_context3(), avcodec_find_decoder(), avcodec_find_encoder(),
3823 * av_dict_set(), av_opt_find().
3825 int avcodec_open2(AVCodecContext *avctx, AVCodec *codec, AVDictionary **options);
3828 * Decode the audio frame of size avpkt->size from avpkt->data into samples.
3829 * Some decoders may support multiple frames in a single AVPacket, such
3830 * decoders would then just decode the first frame. In this case,
3831 * avcodec_decode_audio3 has to be called again with an AVPacket that contains
3832 * the remaining data in order to decode the second frame etc.
3834 * could be outputted, frame_size_ptr is zero. Otherwise, it is the
3835 * decompressed frame size in bytes.
3837 * @warning You must set frame_size_ptr to the allocated size of the
3838 * output buffer before calling avcodec_decode_audio3().
3840 * @warning The input buffer must be FF_INPUT_BUFFER_PADDING_SIZE larger than
3841 * the actual read bytes because some optimized bitstream readers read 32 or 64
3842 * bits at once and could read over the end.
3844 * @warning The end of the input buffer avpkt->data should be set to 0 to ensure that
3845 * no overreading happens for damaged MPEG streams.
3847 * @note You might have to align the input buffer avpkt->data and output buffer
3848 * samples. The alignment requirements depend on the CPU: On some CPUs it isn't
3849 * necessary at all, on others it won't work at all if not aligned and on others
3850 * it will work but it will have an impact on performance.
3852 * In practice, avpkt->data should have 4 byte alignment at minimum and
3853 * samples should be 16 byte aligned unless the CPU doesn't need it
3854 * (AltiVec and SSE do).
3856 * @param avctx the codec context
3857 * @param[out] samples the output buffer, sample type in avctx->sample_fmt
3858 * @param[in,out] frame_size_ptr the output buffer size in bytes
3859 * @param[in] avpkt The input AVPacket containing the input buffer.
3860 * You can create such packet with av_init_packet() and by then setting
3861 * data and size, some decoders might in addition need other fields.
3862 * All decoders are designed to use the least fields possible though.
3863 * @return On error a negative value is returned, otherwise the number of bytes
3864 * used or zero if no frame data was decompressed (used) from the input AVPacket.
3866 int avcodec_decode_audio3(AVCodecContext *avctx, int16_t *samples,
3867 int *frame_size_ptr,
3871 * Decode the video frame of size avpkt->size from avpkt->data into picture.
3872 * Some decoders may support multiple frames in a single AVPacket, such
3873 * decoders would then just decode the first frame.
3875 * @warning The input buffer must be FF_INPUT_BUFFER_PADDING_SIZE larger than
3876 * the actual read bytes because some optimized bitstream readers read 32 or 64
3877 * bits at once and could read over the end.
3879 * @warning The end of the input buffer buf should be set to 0 to ensure that
3880 * no overreading happens for damaged MPEG streams.
3882 * @note You might have to align the input buffer avpkt->data.
3883 * The alignment requirements depend on the CPU: on some CPUs it isn't
3884 * necessary at all, on others it won't work at all if not aligned and on others
3885 * it will work but it will have an impact on performance.
3887 * In practice, avpkt->data should have 4 byte alignment at minimum.
3889 * @note Some codecs have a delay between input and output, these need to be
3890 * fed with avpkt->data=NULL, avpkt->size=0 at the end to return the remaining frames.
3892 * @param avctx the codec context
3893 * @param[out] picture The AVFrame in which the decoded video frame will be stored.
3894 * Use avcodec_alloc_frame to get an AVFrame, the codec will
3895 * allocate memory for the actual bitmap.
3896 * with default get/release_buffer(), the decoder frees/reuses the bitmap as it sees fit.
3897 * with overridden get/release_buffer() (needs CODEC_CAP_DR1) the user decides into what buffer the decoder
3898 * decodes and the decoder tells the user once it does not need the data anymore,
3899 * the user app can at this point free/reuse/keep the memory as it sees fit.
3901 * @param[in] avpkt The input AVpacket containing the input buffer.
3902 * You can create such packet with av_init_packet() and by then setting
3903 * data and size, some decoders might in addition need other fields like
3904 * flags&AV_PKT_FLAG_KEY. All decoders are designed to use the least
3906 * @param[in,out] got_picture_ptr Zero if no frame could be decompressed, otherwise, it is nonzero.
3907 * @return On error a negative value is returned, otherwise the number of bytes
3908 * used or zero if no frame could be decompressed.
3910 int avcodec_decode_video2(AVCodecContext *avctx, AVFrame *picture,
3911 int *got_picture_ptr,
3915 * Decode a subtitle message.
3916 * Return a negative value on error, otherwise return the number of bytes used.
3917 * If no subtitle could be decompressed, got_sub_ptr is zero.
3918 * Otherwise, the subtitle is stored in *sub.
3919 * Note that CODEC_CAP_DR1 is not available for subtitle codecs. This is for
3920 * simplicity, because the performance difference is expect to be negligible
3921 * and reusing a get_buffer written for video codecs would probably perform badly
3922 * due to a potentially very different allocation pattern.
3924 * @param avctx the codec context
3925 * @param[out] sub The AVSubtitle in which the decoded subtitle will be stored, must be
3926 freed with avsubtitle_free if *got_sub_ptr is set.
3927 * @param[in,out] got_sub_ptr Zero if no subtitle could be decompressed, otherwise, it is nonzero.
3928 * @param[in] avpkt The input AVPacket containing the input buffer.
3930 int avcodec_decode_subtitle2(AVCodecContext *avctx, AVSubtitle *sub,
3935 * Frees all allocated data in the given subtitle struct.
3937 * @param sub AVSubtitle to free.
3939 void avsubtitle_free(AVSubtitle *sub);
3941 int avcodec_parse_frame(AVCodecContext *avctx, uint8_t **pdata,
3943 uint8_t *buf, int buf_size);
3946 * Encode an audio frame from samples into buf.
3948 * @note The output buffer should be at least FF_MIN_BUFFER_SIZE bytes large.
3949 * However, for PCM audio the user will know how much space is needed
3950 * because it depends on the value passed in buf_size as described
3951 * below. In that case a lower value can be used.
3953 * @param avctx the codec context
3954 * @param[out] buf the output buffer
3955 * @param[in] buf_size the output buffer size
3956 * @param[in] samples the input buffer containing the samples
3957 * The number of samples read from this buffer is frame_size*channels,
3958 * both of which are defined in avctx.
3959 * For PCM audio the number of samples read from samples is equal to
3960 * buf_size * input_sample_size / output_sample_size.
3961 * @return On error a negative value is returned, on success zero or the number
3962 * of bytes used to encode the data read from the input buffer.
3964 int avcodec_encode_audio(AVCodecContext *avctx, uint8_t *buf, int buf_size,
3965 const short *samples);
3968 * Encode a video frame from pict into buf.
3969 * The input picture should be
3970 * stored using a specific format, namely avctx.pix_fmt.
3972 * @param avctx the codec context
3973 * @param[out] buf the output buffer for the bitstream of encoded frame
3974 * @param[in] buf_size the size of the output buffer in bytes
3975 * @param[in] pict the input picture to encode
3976 * @return On error a negative value is returned, on success zero or the number
3977 * of bytes used from the output buffer.
3979 int avcodec_encode_video(AVCodecContext *avctx, uint8_t *buf, int buf_size,
3980 const AVFrame *pict);
3981 int avcodec_encode_subtitle(AVCodecContext *avctx, uint8_t *buf, int buf_size,
3982 const AVSubtitle *sub);
3984 int avcodec_close(AVCodecContext *avctx);
3987 * Register all the codecs, parsers and bitstream filters which were enabled at
3988 * configuration time. If you do not call this function you can select exactly
3989 * which formats you want to support, by using the individual registration
3992 * @see avcodec_register
3993 * @see av_register_codec_parser
3994 * @see av_register_bitstream_filter
3996 void avcodec_register_all(void);
3999 * Flush buffers, should be called when seeking or when switching to a different stream.
4001 void avcodec_flush_buffers(AVCodecContext *avctx);
4003 void avcodec_default_free_buffers(AVCodecContext *s);
4005 /* misc useful functions */
4007 #if FF_API_OLD_FF_PICT_TYPES
4009 * Return a single letter to describe the given picture type pict_type.
4011 * @param[in] pict_type the picture type
4012 * @return A single character representing the picture type.
4013 * @deprecated Use av_get_picture_type_char() instead.
4015 attribute_deprecated
4016 char av_get_pict_type_char(int pict_type);
4020 * Return codec bits per sample.
4022 * @param[in] codec_id the codec
4023 * @return Number of bits per sample or zero if unknown for the given codec.
4025 int av_get_bits_per_sample(enum CodecID codec_id);
4027 #if FF_API_OLD_SAMPLE_FMT
4029 * @deprecated Use av_get_bytes_per_sample() instead.
4031 attribute_deprecated
4032 int av_get_bits_per_sample_format(enum AVSampleFormat sample_fmt);
4036 typedef struct AVCodecParserContext {
4038 struct AVCodecParser *parser;
4039 int64_t frame_offset; /* offset of the current frame */
4040 int64_t cur_offset; /* current offset
4041 (incremented by each av_parser_parse()) */
4042 int64_t next_frame_offset; /* offset of the next frame */
4044 int pict_type; /* XXX: Put it back in AVCodecContext. */
4046 * This field is used for proper frame duration computation in lavf.
4047 * It signals, how much longer the frame duration of the current frame
4048 * is compared to normal frame duration.
4050 * frame_duration = (1 + repeat_pict) * time_base
4052 * It is used by codecs like H.264 to display telecined material.
4054 int repeat_pict; /* XXX: Put it back in AVCodecContext. */
4055 int64_t pts; /* pts of the current frame */
4056 int64_t dts; /* dts of the current frame */
4061 int fetch_timestamp;
4063 #define AV_PARSER_PTS_NB 4
4064 int cur_frame_start_index;
4065 int64_t cur_frame_offset[AV_PARSER_PTS_NB];
4066 int64_t cur_frame_pts[AV_PARSER_PTS_NB];
4067 int64_t cur_frame_dts[AV_PARSER_PTS_NB];
4070 #define PARSER_FLAG_COMPLETE_FRAMES 0x0001
4071 #define PARSER_FLAG_ONCE 0x0002
4072 /// Set if the parser has a valid file offset
4073 #define PARSER_FLAG_FETCHED_OFFSET 0x0004
4075 int64_t offset; ///< byte offset from starting packet start
4076 int64_t cur_frame_end[AV_PARSER_PTS_NB];
4079 * Set by parser to 1 for key frames and 0 for non-key frames.
4080 * It is initialized to -1, so if the parser doesn't set this flag,
4081 * old-style fallback using AV_PICTURE_TYPE_I picture type as key frames
4087 * Time difference in stream time base units from the pts of this
4088 * packet to the point at which the output from the decoder has converged
4089 * independent from the availability of previous frames. That is, the
4090 * frames are virtually identical no matter if decoding started from
4091 * the very first frame or from this keyframe.
4092 * Is AV_NOPTS_VALUE if unknown.
4093 * This field is not the display duration of the current frame.
4094 * This field has no meaning if the packet does not have AV_PKT_FLAG_KEY
4097 * The purpose of this field is to allow seeking in streams that have no
4098 * keyframes in the conventional sense. It corresponds to the
4099 * recovery point SEI in H.264 and match_time_delta in NUT. It is also
4100 * essential for some types of subtitle streams to ensure that all
4101 * subtitles are correctly displayed after seeking.
4103 int64_t convergence_duration;
4105 // Timestamp generation support:
4107 * Synchronization point for start of timestamp generation.
4109 * Set to >0 for sync point, 0 for no sync point and <0 for undefined
4112 * For example, this corresponds to presence of H.264 buffering period
4118 * Offset of the current timestamp against last timestamp sync point in
4119 * units of AVCodecContext.time_base.
4121 * Set to INT_MIN when dts_sync_point unused. Otherwise, it must
4122 * contain a valid timestamp offset.
4124 * Note that the timestamp of sync point has usually a nonzero
4125 * dts_ref_dts_delta, which refers to the previous sync point. Offset of
4126 * the next frame after timestamp sync point will be usually 1.
4128 * For example, this corresponds to H.264 cpb_removal_delay.
4130 int dts_ref_dts_delta;
4133 * Presentation delay of current frame in units of AVCodecContext.time_base.
4135 * Set to INT_MIN when dts_sync_point unused. Otherwise, it must
4136 * contain valid non-negative timestamp delta (presentation time of a frame
4137 * must not lie in the past).
4139 * This delay represents the difference between decoding and presentation
4140 * time of the frame.
4142 * For example, this corresponds to H.264 dpb_output_delay.
4147 * Position of the packet in file.
4149 * Analogous to cur_frame_pts/dts
4151 int64_t cur_frame_pos[AV_PARSER_PTS_NB];
4154 * Byte position of currently parsed frame in stream.
4159 * Previous frame byte position.
4162 } AVCodecParserContext;
4164 typedef struct AVCodecParser {
4165 int codec_ids[5]; /* several codec IDs are permitted */
4167 int (*parser_init)(AVCodecParserContext *s);
4168 int (*parser_parse)(AVCodecParserContext *s,
4169 AVCodecContext *avctx,
4170 const uint8_t **poutbuf, int *poutbuf_size,
4171 const uint8_t *buf, int buf_size);
4172 void (*parser_close)(AVCodecParserContext *s);
4173 int (*split)(AVCodecContext *avctx, const uint8_t *buf, int buf_size);
4174 struct AVCodecParser *next;
4177 AVCodecParser *av_parser_next(AVCodecParser *c);
4179 void av_register_codec_parser(AVCodecParser *parser);
4180 AVCodecParserContext *av_parser_init(int codec_id);
4185 * @param s parser context.
4186 * @param avctx codec context.
4187 * @param poutbuf set to pointer to parsed buffer or NULL if not yet finished.
4188 * @param poutbuf_size set to size of parsed buffer or zero if not yet finished.
4189 * @param buf input buffer.
4190 * @param buf_size input length, to signal EOF, this should be 0 (so that the last frame can be output).
4191 * @param pts input presentation timestamp.
4192 * @param dts input decoding timestamp.
4193 * @param pos input byte position in stream.
4194 * @return the number of bytes of the input bitstream used.
4199 * len = av_parser_parse2(myparser, AVCodecContext, &data, &size,
4206 * decode_frame(data, size);
4210 int av_parser_parse2(AVCodecParserContext *s,
4211 AVCodecContext *avctx,
4212 uint8_t **poutbuf, int *poutbuf_size,
4213 const uint8_t *buf, int buf_size,
4214 int64_t pts, int64_t dts,
4217 int av_parser_change(AVCodecParserContext *s,
4218 AVCodecContext *avctx,
4219 uint8_t **poutbuf, int *poutbuf_size,
4220 const uint8_t *buf, int buf_size, int keyframe);
4221 void av_parser_close(AVCodecParserContext *s);
4224 typedef struct AVBitStreamFilterContext {
4226 struct AVBitStreamFilter *filter;
4227 AVCodecParserContext *parser;
4228 struct AVBitStreamFilterContext *next;
4229 } AVBitStreamFilterContext;
4232 typedef struct AVBitStreamFilter {
4235 int (*filter)(AVBitStreamFilterContext *bsfc,
4236 AVCodecContext *avctx, const char *args,
4237 uint8_t **poutbuf, int *poutbuf_size,
4238 const uint8_t *buf, int buf_size, int keyframe);
4239 void (*close)(AVBitStreamFilterContext *bsfc);
4240 struct AVBitStreamFilter *next;
4241 } AVBitStreamFilter;
4243 void av_register_bitstream_filter(AVBitStreamFilter *bsf);
4244 AVBitStreamFilterContext *av_bitstream_filter_init(const char *name);
4245 int av_bitstream_filter_filter(AVBitStreamFilterContext *bsfc,
4246 AVCodecContext *avctx, const char *args,
4247 uint8_t **poutbuf, int *poutbuf_size,
4248 const uint8_t *buf, int buf_size, int keyframe);
4249 void av_bitstream_filter_close(AVBitStreamFilterContext *bsf);
4251 AVBitStreamFilter *av_bitstream_filter_next(AVBitStreamFilter *f);
4256 * Reallocate the given block if it is not large enough, otherwise do nothing.
4260 void *av_fast_realloc(void *ptr, unsigned int *size, size_t min_size);
4263 * Allocate a buffer, reusing the given one if large enough.
4265 * Contrary to av_fast_realloc the current buffer contents might not be
4266 * preserved and on error the old buffer is freed, thus no special
4267 * handling to avoid memleaks is necessary.
4269 * @param ptr pointer to pointer to already allocated buffer, overwritten with pointer to new buffer
4270 * @param size size of the buffer *ptr points to
4271 * @param min_size minimum size of *ptr buffer after returning, *ptr will be NULL and
4272 * *size 0 if an error occurred.
4274 void av_fast_malloc(void *ptr, unsigned int *size, size_t min_size);
4277 * Copy image src to dst. Wraps av_picture_data_copy() above.
4279 void av_picture_copy(AVPicture *dst, const AVPicture *src,
4280 enum PixelFormat pix_fmt, int width, int height);
4283 * Crop image top and left side.
4285 int av_picture_crop(AVPicture *dst, const AVPicture *src,
4286 enum PixelFormat pix_fmt, int top_band, int left_band);
4291 int av_picture_pad(AVPicture *dst, const AVPicture *src, int height, int width, enum PixelFormat pix_fmt,
4292 int padtop, int padbottom, int padleft, int padright, int *color);
4295 * Encode extradata length to a buffer. Used by xiph codecs.
4297 * @param s buffer to write to; must be at least (v/255+1) bytes long
4298 * @param v size of extradata in bytes
4299 * @return number of bytes written to the buffer.
4301 unsigned int av_xiphlacing(unsigned char *s, unsigned int v);
4304 * Logs a generic warning message about a missing feature. This function is
4305 * intended to be used internally by FFmpeg (libavcodec, libavformat, etc.)
4306 * only, and would normally not be used by applications.
4307 * @param[in] avc a pointer to an arbitrary struct of which the first field is
4308 * a pointer to an AVClass struct
4309 * @param[in] feature string containing the name of the missing feature
4310 * @param[in] want_sample indicates if samples are wanted which exhibit this feature.
4311 * If want_sample is non-zero, additional verbage will be added to the log
4312 * message which tells the user how to report samples to the development
4315 void av_log_missing_feature(void *avc, const char *feature, int want_sample);
4318 * Log a generic warning message asking for a sample. This function is
4319 * intended to be used internally by FFmpeg (libavcodec, libavformat, etc.)
4320 * only, and would normally not be used by applications.
4321 * @param[in] avc a pointer to an arbitrary struct of which the first field is
4322 * a pointer to an AVClass struct
4323 * @param[in] msg string containing an optional message, or NULL if no message
4325 void av_log_ask_for_sample(void *avc, const char *msg, ...) av_printf_format(2, 3);
4328 * Register the hardware accelerator hwaccel.
4330 void av_register_hwaccel(AVHWAccel *hwaccel);
4333 * If hwaccel is NULL, returns the first registered hardware accelerator,
4334 * if hwaccel is non-NULL, returns the next registered hardware accelerator
4335 * after hwaccel, or NULL if hwaccel is the last one.
4337 AVHWAccel *av_hwaccel_next(AVHWAccel *hwaccel);
4341 * Lock operation used by lockmgr
4344 AV_LOCK_CREATE, ///< Create a mutex
4345 AV_LOCK_OBTAIN, ///< Lock the mutex
4346 AV_LOCK_RELEASE, ///< Unlock the mutex
4347 AV_LOCK_DESTROY, ///< Free mutex resources
4351 * Register a user provided lock manager supporting the operations
4352 * specified by AVLockOp. mutex points to a (void *) where the
4353 * lockmgr should store/get a pointer to a user allocated mutex. It's
4354 * NULL upon AV_LOCK_CREATE and != NULL for all other ops.
4356 * @param cb User defined callback. Note: FFmpeg may invoke calls to this
4357 * callback during the call to av_lockmgr_register().
4358 * Thus, the application must be prepared to handle that.
4359 * If cb is set to NULL the lockmgr will be unregistered.
4360 * Also note that during unregistration the previously registered
4361 * lockmgr callback may also be invoked.
4363 int av_lockmgr_register(int (*cb)(void **mutex, enum AVLockOp op));
4366 * Get the type of the given codec.
4368 enum AVMediaType avcodec_get_type(enum CodecID codec_id);
4370 #endif /* AVCODEC_AVCODEC_H */