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,
347 CODEC_ID_G729 = 0x15800,
348 CODEC_ID_G723_1= 0x15801,
350 /* subtitle codecs */
351 CODEC_ID_FIRST_SUBTITLE = 0x17000, ///< A dummy ID pointing at the start of subtitle codecs.
352 CODEC_ID_DVD_SUBTITLE= 0x17000,
353 CODEC_ID_DVB_SUBTITLE,
354 CODEC_ID_TEXT, ///< raw UTF-8 text
358 CODEC_ID_HDMV_PGS_SUBTITLE,
359 CODEC_ID_DVB_TELETEXT,
363 /* other specific kind of codecs (generally used for attachments) */
364 CODEC_ID_FIRST_UNKNOWN = 0x18000, ///< A dummy ID pointing at the start of various fake codecs.
365 CODEC_ID_TTF= 0x18000,
370 CODEC_ID_PROBE= 0x19000, ///< codec_id is not known (like CODEC_ID_NONE) but lavf should attempt to identify it
372 CODEC_ID_MPEG2TS= 0x20000, /**< _FAKE_ codec to indicate a raw MPEG-2 TS
373 * stream (only used by libavformat) */
374 CODEC_ID_FFMETADATA=0x21000, ///< Dummy codec for streams containing only metadata information.
377 #if FF_API_OLD_SAMPLE_FMT
378 #define SampleFormat AVSampleFormat
380 #define SAMPLE_FMT_NONE AV_SAMPLE_FMT_NONE
381 #define SAMPLE_FMT_U8 AV_SAMPLE_FMT_U8
382 #define SAMPLE_FMT_S16 AV_SAMPLE_FMT_S16
383 #define SAMPLE_FMT_S32 AV_SAMPLE_FMT_S32
384 #define SAMPLE_FMT_FLT AV_SAMPLE_FMT_FLT
385 #define SAMPLE_FMT_DBL AV_SAMPLE_FMT_DBL
386 #define SAMPLE_FMT_NB AV_SAMPLE_FMT_NB
389 #if FF_API_OLD_AUDIOCONVERT
390 #include "libavutil/audioconvert.h"
392 /* Audio channel masks */
393 #define CH_FRONT_LEFT AV_CH_FRONT_LEFT
394 #define CH_FRONT_RIGHT AV_CH_FRONT_RIGHT
395 #define CH_FRONT_CENTER AV_CH_FRONT_CENTER
396 #define CH_LOW_FREQUENCY AV_CH_LOW_FREQUENCY
397 #define CH_BACK_LEFT AV_CH_BACK_LEFT
398 #define CH_BACK_RIGHT AV_CH_BACK_RIGHT
399 #define CH_FRONT_LEFT_OF_CENTER AV_CH_FRONT_LEFT_OF_CENTER
400 #define CH_FRONT_RIGHT_OF_CENTER AV_CH_FRONT_RIGHT_OF_CENTER
401 #define CH_BACK_CENTER AV_CH_BACK_CENTER
402 #define CH_SIDE_LEFT AV_CH_SIDE_LEFT
403 #define CH_SIDE_RIGHT AV_CH_SIDE_RIGHT
404 #define CH_TOP_CENTER AV_CH_TOP_CENTER
405 #define CH_TOP_FRONT_LEFT AV_CH_TOP_FRONT_LEFT
406 #define CH_TOP_FRONT_CENTER AV_CH_TOP_FRONT_CENTER
407 #define CH_TOP_FRONT_RIGHT AV_CH_TOP_FRONT_RIGHT
408 #define CH_TOP_BACK_LEFT AV_CH_TOP_BACK_LEFT
409 #define CH_TOP_BACK_CENTER AV_CH_TOP_BACK_CENTER
410 #define CH_TOP_BACK_RIGHT AV_CH_TOP_BACK_RIGHT
411 #define CH_STEREO_LEFT AV_CH_STEREO_LEFT
412 #define CH_STEREO_RIGHT AV_CH_STEREO_RIGHT
414 /** Channel mask value used for AVCodecContext.request_channel_layout
415 to indicate that the user requests the channel order of the decoder output
416 to be the native codec channel order. */
417 #define CH_LAYOUT_NATIVE AV_CH_LAYOUT_NATIVE
419 /* Audio channel convenience macros */
420 #define CH_LAYOUT_MONO AV_CH_LAYOUT_MONO
421 #define CH_LAYOUT_STEREO AV_CH_LAYOUT_STEREO
422 #define CH_LAYOUT_2_1 AV_CH_LAYOUT_2_1
423 #define CH_LAYOUT_SURROUND AV_CH_LAYOUT_SURROUND
424 #define CH_LAYOUT_4POINT0 AV_CH_LAYOUT_4POINT0
425 #define CH_LAYOUT_2_2 AV_CH_LAYOUT_2_2
426 #define CH_LAYOUT_QUAD AV_CH_LAYOUT_QUAD
427 #define CH_LAYOUT_5POINT0 AV_CH_LAYOUT_5POINT0
428 #define CH_LAYOUT_5POINT1 AV_CH_LAYOUT_5POINT1
429 #define CH_LAYOUT_5POINT0_BACK AV_CH_LAYOUT_5POINT0_BACK
430 #define CH_LAYOUT_5POINT1_BACK AV_CH_LAYOUT_5POINT1_BACK
431 #define CH_LAYOUT_7POINT0 AV_CH_LAYOUT_7POINT0
432 #define CH_LAYOUT_7POINT1 AV_CH_LAYOUT_7POINT1
433 #define CH_LAYOUT_7POINT1_WIDE AV_CH_LAYOUT_7POINT1_WIDE
434 #define CH_LAYOUT_STEREO_DOWNMIX AV_CH_LAYOUT_STEREO_DOWNMIX
438 #define AVCODEC_MAX_AUDIO_FRAME_SIZE 192000 // 1 second of 48khz 32bit audio
441 * Required number of additionally allocated bytes at the end of the input bitstream for decoding.
442 * This is mainly needed because some optimized bitstream readers read
443 * 32 or 64 bit at once and could read over the end.<br>
444 * Note: If the first 23 bits of the additional bytes are not 0, then damaged
445 * MPEG bitstreams could cause overread and segfault.
447 #define FF_INPUT_BUFFER_PADDING_SIZE 16
450 * minimum encoding buffer size
451 * Used to avoid some checks during header writing.
453 #define FF_MIN_BUFFER_SIZE 16384
457 * motion estimation type.
460 ME_ZERO = 1, ///< no search, that is use 0,0 vector whenever one is needed
464 ME_EPZS, ///< enhanced predictive zonal search
465 ME_X1, ///< reserved for experiments
466 ME_HEX, ///< hexagon based search
467 ME_UMH, ///< uneven multi-hexagon search
468 ME_ITER, ///< iterative search
469 ME_TESA, ///< transformed exhaustive search algorithm
473 /* We leave some space between them for extensions (drop some
474 * keyframes for intra-only or drop just some bidir frames). */
475 AVDISCARD_NONE =-16, ///< discard nothing
476 AVDISCARD_DEFAULT= 0, ///< discard useless packets like 0 size packets in avi
477 AVDISCARD_NONREF = 8, ///< discard all non reference
478 AVDISCARD_BIDIR = 16, ///< discard all bidirectional frames
479 AVDISCARD_NONKEY = 32, ///< discard all frames except keyframes
480 AVDISCARD_ALL = 48, ///< discard all
483 enum AVColorPrimaries{
484 AVCOL_PRI_BT709 =1, ///< also ITU-R BT1361 / IEC 61966-2-4 / SMPTE RP177 Annex B
485 AVCOL_PRI_UNSPECIFIED=2,
487 AVCOL_PRI_BT470BG =5, ///< also ITU-R BT601-6 625 / ITU-R BT1358 625 / ITU-R BT1700 625 PAL & SECAM
488 AVCOL_PRI_SMPTE170M =6, ///< also ITU-R BT601-6 525 / ITU-R BT1358 525 / ITU-R BT1700 NTSC
489 AVCOL_PRI_SMPTE240M =7, ///< functionally identical to above
491 AVCOL_PRI_NB , ///< Not part of ABI
494 enum AVColorTransferCharacteristic{
495 AVCOL_TRC_BT709 =1, ///< also ITU-R BT1361
496 AVCOL_TRC_UNSPECIFIED=2,
497 AVCOL_TRC_GAMMA22 =4, ///< also ITU-R BT470M / ITU-R BT1700 625 PAL & SECAM
498 AVCOL_TRC_GAMMA28 =5, ///< also ITU-R BT470BG
499 AVCOL_TRC_NB , ///< Not part of ABI
504 AVCOL_SPC_BT709 =1, ///< also ITU-R BT1361 / IEC 61966-2-4 xvYCC709 / SMPTE RP177 Annex B
505 AVCOL_SPC_UNSPECIFIED=2,
507 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
508 AVCOL_SPC_SMPTE170M =6, ///< also ITU-R BT601-6 525 / ITU-R BT1358 525 / ITU-R BT1700 NTSC / functionally identical to above
509 AVCOL_SPC_SMPTE240M =7,
510 AVCOL_SPC_NB , ///< Not part of ABI
514 AVCOL_RANGE_UNSPECIFIED=0,
515 AVCOL_RANGE_MPEG =1, ///< the normal 219*2^(n-8) "MPEG" YUV ranges
516 AVCOL_RANGE_JPEG =2, ///< the normal 2^n-1 "JPEG" YUV ranges
517 AVCOL_RANGE_NB , ///< Not part of ABI
521 * X X 3 4 X X are luma samples,
522 * 1 2 1-6 are possible chroma positions
523 * X X 5 6 X 0 is undefined/unknown position
525 enum AVChromaLocation{
526 AVCHROMA_LOC_UNSPECIFIED=0,
527 AVCHROMA_LOC_LEFT =1, ///< mpeg2/4, h264 default
528 AVCHROMA_LOC_CENTER =2, ///< mpeg1, jpeg, h263
529 AVCHROMA_LOC_TOPLEFT =3, ///< DV
531 AVCHROMA_LOC_BOTTOMLEFT =5,
532 AVCHROMA_LOC_BOTTOM =6,
533 AVCHROMA_LOC_NB , ///< Not part of ABI
536 #if FF_API_FLAC_GLOBAL_OPTS
540 attribute_deprecated enum AVLPCType {
541 AV_LPC_TYPE_DEFAULT = -1, ///< use the codec default LPC type
542 AV_LPC_TYPE_NONE = 0, ///< do not use LPC prediction or use all zero coefficients
543 AV_LPC_TYPE_FIXED = 1, ///< fixed LPC coefficients
544 AV_LPC_TYPE_LEVINSON = 2, ///< Levinson-Durbin recursion
545 AV_LPC_TYPE_CHOLESKY = 3, ///< Cholesky factorization
546 AV_LPC_TYPE_NB , ///< Not part of ABI
550 enum AVAudioServiceType {
551 AV_AUDIO_SERVICE_TYPE_MAIN = 0,
552 AV_AUDIO_SERVICE_TYPE_EFFECTS = 1,
553 AV_AUDIO_SERVICE_TYPE_VISUALLY_IMPAIRED = 2,
554 AV_AUDIO_SERVICE_TYPE_HEARING_IMPAIRED = 3,
555 AV_AUDIO_SERVICE_TYPE_DIALOGUE = 4,
556 AV_AUDIO_SERVICE_TYPE_COMMENTARY = 5,
557 AV_AUDIO_SERVICE_TYPE_EMERGENCY = 6,
558 AV_AUDIO_SERVICE_TYPE_VOICE_OVER = 7,
559 AV_AUDIO_SERVICE_TYPE_KARAOKE = 8,
560 AV_AUDIO_SERVICE_TYPE_NB , ///< Not part of ABI
563 typedef struct RcOverride{
566 int qscale; // If this is 0 then quality_factor will be used instead.
567 float quality_factor;
570 #define FF_MAX_B_FRAMES 16
573 These flags can be passed in AVCodecContext.flags before initialization.
574 Note: Not everything is supported yet.
577 #define CODEC_FLAG_QSCALE 0x0002 ///< Use fixed qscale.
578 #define CODEC_FLAG_4MV 0x0004 ///< 4 MV per MB allowed / advanced prediction for H.263.
579 #define CODEC_FLAG_QPEL 0x0010 ///< Use qpel MC.
580 #define CODEC_FLAG_GMC 0x0020 ///< Use GMC.
581 #define CODEC_FLAG_MV0 0x0040 ///< Always try a MB with MV=<0,0>.
583 * The parent program guarantees that the input for B-frames containing
584 * streams is not written to for at least s->max_b_frames+1 frames, if
585 * this is not set the input will be copied.
587 #define CODEC_FLAG_INPUT_PRESERVED 0x0100
588 #define CODEC_FLAG_PASS1 0x0200 ///< Use internal 2pass ratecontrol in first pass mode.
589 #define CODEC_FLAG_PASS2 0x0400 ///< Use internal 2pass ratecontrol in second pass mode.
590 #define CODEC_FLAG_GRAY 0x2000 ///< Only decode/encode grayscale.
591 #define CODEC_FLAG_EMU_EDGE 0x4000 ///< Don't draw edges.
592 #define CODEC_FLAG_PSNR 0x8000 ///< error[?] variables will be set during encoding.
593 #define CODEC_FLAG_TRUNCATED 0x00010000 /** Input bitstream might be truncated at a random
594 location instead of only at frame boundaries. */
595 #define CODEC_FLAG_NORMALIZE_AQP 0x00020000 ///< Normalize adaptive quantization.
596 #define CODEC_FLAG_INTERLACED_DCT 0x00040000 ///< Use interlaced DCT.
597 #define CODEC_FLAG_LOW_DELAY 0x00080000 ///< Force low delay.
598 #define CODEC_FLAG_GLOBAL_HEADER 0x00400000 ///< Place global headers in extradata instead of every keyframe.
599 #define CODEC_FLAG_BITEXACT 0x00800000 ///< Use only bitexact stuff (except (I)DCT).
600 /* Fx : Flag for h263+ extra options */
601 #define CODEC_FLAG_AC_PRED 0x01000000 ///< H.263 advanced intra coding / MPEG-4 AC prediction
602 #define CODEC_FLAG_CBP_RD 0x04000000 ///< Use rate distortion optimization for cbp.
603 #define CODEC_FLAG_QP_RD 0x08000000 ///< Use rate distortion optimization for qp selectioon.
604 #define CODEC_FLAG_LOOP_FILTER 0x00000800 ///< loop filter
605 #define CODEC_FLAG_INTERLACED_ME 0x20000000 ///< interlaced motion estimation
606 #define CODEC_FLAG_CLOSED_GOP 0x80000000
607 #define CODEC_FLAG2_FAST 0x00000001 ///< Allow non spec compliant speedup tricks.
608 #define CODEC_FLAG2_STRICT_GOP 0x00000002 ///< Strictly enforce GOP size.
609 #define CODEC_FLAG2_NO_OUTPUT 0x00000004 ///< Skip bitstream encoding.
610 #define CODEC_FLAG2_LOCAL_HEADER 0x00000008 ///< Place global headers at every keyframe instead of in extradata.
611 #define CODEC_FLAG2_SKIP_RD 0x00004000 ///< RD optimal MB level residual skipping
612 #define CODEC_FLAG2_CHUNKS 0x00008000 ///< Input bitstream might be truncated at a packet boundaries instead of only at frame boundaries.
613 #define CODEC_FLAG2_SHOW_ALL 0x00400000 ///< Show all frames before the first keyframe
615 * @defgroup deprecated_flags Deprecated codec flags
616 * Use corresponding private codec options instead.
619 #if FF_API_MPEGVIDEO_GLOBAL_OPTS
620 #define CODEC_FLAG_OBMC 0x00000001 ///< OBMC
621 #define CODEC_FLAG_H263P_AIV 0x00000008 ///< H.263 alternative inter VLC
622 #define CODEC_FLAG_PART 0x0080 ///< Use data partitioning.
623 #define CODEC_FLAG_ALT_SCAN 0x00100000 ///< Use alternate scan.
624 #define CODEC_FLAG_H263P_UMV 0x02000000 ///< unlimited motion vector
625 #define CODEC_FLAG_H263P_SLICE_STRUCT 0x10000000
626 #define CODEC_FLAG_SVCD_SCAN_OFFSET 0x40000000 ///< Will reserve space for SVCD scan offset user data.
627 #define CODEC_FLAG2_INTRA_VLC 0x00000800 ///< Use MPEG-2 intra VLC table.
628 #define CODEC_FLAG2_DROP_FRAME_TIMECODE 0x00002000 ///< timecode is in drop frame format.
629 #define CODEC_FLAG2_NON_LINEAR_QUANT 0x00010000 ///< Use MPEG-2 nonlinear quantizer.
631 #if FF_API_MJPEG_GLOBAL_OPTS
632 #define CODEC_FLAG_EXTERN_HUFF 0x1000 ///< Use external Huffman table (for MJPEG).
634 #if FF_API_X264_GLOBAL_OPTS
635 #define CODEC_FLAG2_BPYRAMID 0x00000010 ///< H.264 allow B-frames to be used as references.
636 #define CODEC_FLAG2_WPRED 0x00000020 ///< H.264 weighted biprediction for B-frames
637 #define CODEC_FLAG2_MIXED_REFS 0x00000040 ///< H.264 one reference per partition, as opposed to one reference per macroblock
638 #define CODEC_FLAG2_8X8DCT 0x00000080 ///< H.264 high profile 8x8 transform
639 #define CODEC_FLAG2_FASTPSKIP 0x00000100 ///< H.264 fast pskip
640 #define CODEC_FLAG2_AUD 0x00000200 ///< H.264 access unit delimiters
641 #define CODEC_FLAG2_BRDO 0x00000400 ///< B-frame rate-distortion optimization
642 #define CODEC_FLAG2_MBTREE 0x00040000 ///< Use macroblock tree ratecontrol (x264 only)
643 #define CODEC_FLAG2_PSY 0x00080000 ///< Use psycho visual optimizations.
644 #define CODEC_FLAG2_SSIM 0x00100000 ///< Compute SSIM during encoding, error[] values are undefined.
645 #define CODEC_FLAG2_INTRA_REFRESH 0x00200000 ///< Use periodic insertion of intra blocks instead of keyframes.
647 #if FF_API_SNOW_GLOBAL_OPTS
648 #define CODEC_FLAG2_MEMC_ONLY 0x00001000 ///< Only do ME/MC (I frames -> ref, P frame -> ME+MC).
650 #if FF_API_LAME_GLOBAL_OPTS
651 #define CODEC_FLAG2_BIT_RESERVOIR 0x00020000 ///< Use a bit reservoir when encoding if possible
657 /* Unsupported options :
658 * Syntax Arithmetic coding (SAC)
659 * Reference Picture Selection
660 * Independent Segment Decoding */
662 /* codec capabilities */
664 #define CODEC_CAP_DRAW_HORIZ_BAND 0x0001 ///< Decoder can use draw_horiz_band callback.
666 * Codec uses get_buffer() for allocating buffers and supports custom allocators.
667 * If not set, it might not use get_buffer() at all or use operations that
668 * assume the buffer was allocated by avcodec_default_get_buffer.
670 #define CODEC_CAP_DR1 0x0002
671 /* If 'parse_only' field is true, then avcodec_parse_frame() can be used. */
672 #define CODEC_CAP_PARSE_ONLY 0x0004
673 #define CODEC_CAP_TRUNCATED 0x0008
674 /* Codec can export data for HW decoding (XvMC). */
675 #define CODEC_CAP_HWACCEL 0x0010
677 * Codec has a nonzero delay and needs to be fed with NULL at the end to get the delayed data.
678 * If this is not set, the codec is guaranteed to never be fed with NULL data.
680 #define CODEC_CAP_DELAY 0x0020
682 * Codec can be fed a final frame with a smaller size.
683 * This can be used to prevent truncation of the last audio samples.
685 #define CODEC_CAP_SMALL_LAST_FRAME 0x0040
687 * Codec can export data for HW decoding (VDPAU).
689 #define CODEC_CAP_HWACCEL_VDPAU 0x0080
691 * Codec can output multiple frames per AVPacket
692 * Normally demuxers return one frame at a time, demuxers which do not do
693 * are connected to a parser to split what they return into proper frames.
694 * This flag is reserved to the very rare category of codecs which have a
695 * bitstream that cannot be split into frames without timeconsuming
696 * operations like full decoding. Demuxers carring such bitstreams thus
697 * may return multiple frames in a packet. This has many disadvantages like
698 * prohibiting stream copy in many cases thus it should only be considered
701 #define CODEC_CAP_SUBFRAMES 0x0100
703 * Codec is experimental and is thus avoided in favor of non experimental
706 #define CODEC_CAP_EXPERIMENTAL 0x0200
708 * Codec should fill in channel configuration and samplerate instead of container
710 #define CODEC_CAP_CHANNEL_CONF 0x0400
713 * Codec is able to deal with negative linesizes
715 #define CODEC_CAP_NEG_LINESIZES 0x0800
718 * Codec supports frame-level multithreading.
720 #define CODEC_CAP_FRAME_THREADS 0x1000
722 * Codec supports slice-based (or partition-based) multithreading.
724 #define CODEC_CAP_SLICE_THREADS 0x2000
728 #define CODEC_CAP_LOSSLESS 0x80000000
730 //The following defines may change, don't expect compatibility if you use them.
731 #define MB_TYPE_INTRA4x4 0x0001
732 #define MB_TYPE_INTRA16x16 0x0002 //FIXME H.264-specific
733 #define MB_TYPE_INTRA_PCM 0x0004 //FIXME H.264-specific
734 #define MB_TYPE_16x16 0x0008
735 #define MB_TYPE_16x8 0x0010
736 #define MB_TYPE_8x16 0x0020
737 #define MB_TYPE_8x8 0x0040
738 #define MB_TYPE_INTERLACED 0x0080
739 #define MB_TYPE_DIRECT2 0x0100 //FIXME
740 #define MB_TYPE_ACPRED 0x0200
741 #define MB_TYPE_GMC 0x0400
742 #define MB_TYPE_SKIP 0x0800
743 #define MB_TYPE_P0L0 0x1000
744 #define MB_TYPE_P1L0 0x2000
745 #define MB_TYPE_P0L1 0x4000
746 #define MB_TYPE_P1L1 0x8000
747 #define MB_TYPE_L0 (MB_TYPE_P0L0 | MB_TYPE_P1L0)
748 #define MB_TYPE_L1 (MB_TYPE_P0L1 | MB_TYPE_P1L1)
749 #define MB_TYPE_L0L1 (MB_TYPE_L0 | MB_TYPE_L1)
750 #define MB_TYPE_QUANT 0x00010000
751 #define MB_TYPE_CBP 0x00020000
752 //Note bits 24-31 are reserved for codec specific use (h264 ref0, mpeg1 0mv, ...)
756 * This specifies the area which should be displayed.
757 * Note there may be multiple such areas for one frame.
759 typedef struct AVPanScan{
762 * - encoding: Set by user.
763 * - decoding: Set by libavcodec.
768 * width and height in 1/16 pel
769 * - encoding: Set by user.
770 * - decoding: Set by libavcodec.
776 * position of the top left corner in 1/16 pel for up to 3 fields/frames
777 * - encoding: Set by user.
778 * - decoding: Set by libavcodec.
780 int16_t position[3][2];
783 #define FF_QSCALE_TYPE_MPEG1 0
784 #define FF_QSCALE_TYPE_MPEG2 1
785 #define FF_QSCALE_TYPE_H264 2
786 #define FF_QSCALE_TYPE_VP56 3
788 #define FF_BUFFER_TYPE_INTERNAL 1
789 #define FF_BUFFER_TYPE_USER 2 ///< direct rendering buffers (image is (de)allocated by user)
790 #define FF_BUFFER_TYPE_SHARED 4 ///< Buffer from somewhere else; don't deallocate image (data/base), all other tables are not shared.
791 #define FF_BUFFER_TYPE_COPY 8 ///< Just a (modified) copy of some other buffer, don't deallocate anything.
793 #if FF_API_OLD_FF_PICT_TYPES
794 /* DEPRECATED, directly use the AV_PICTURE_TYPE_* enum values */
795 #define FF_I_TYPE AV_PICTURE_TYPE_I ///< Intra
796 #define FF_P_TYPE AV_PICTURE_TYPE_P ///< Predicted
797 #define FF_B_TYPE AV_PICTURE_TYPE_B ///< Bi-dir predicted
798 #define FF_S_TYPE AV_PICTURE_TYPE_S ///< S(GMC)-VOP MPEG4
799 #define FF_SI_TYPE AV_PICTURE_TYPE_SI ///< Switching Intra
800 #define FF_SP_TYPE AV_PICTURE_TYPE_SP ///< Switching Predicted
801 #define FF_BI_TYPE AV_PICTURE_TYPE_BI
804 #define FF_BUFFER_HINTS_VALID 0x01 // Buffer hints value is meaningful (if 0 ignore).
805 #define FF_BUFFER_HINTS_READABLE 0x02 // Codec will read from buffer.
806 #define FF_BUFFER_HINTS_PRESERVE 0x04 // User must not alter buffer content.
807 #define FF_BUFFER_HINTS_REUSABLE 0x08 // Codec will reuse the buffer (update).
809 enum AVPacketSideDataType {
813 typedef struct AVPacket {
815 * Presentation timestamp in AVStream->time_base units; the time at which
816 * the decompressed packet will be presented to the user.
817 * Can be AV_NOPTS_VALUE if it is not stored in the file.
818 * pts MUST be larger or equal to dts as presentation cannot happen before
819 * decompression, unless one wants to view hex dumps. Some formats misuse
820 * the terms dts and pts/cts to mean something different. Such timestamps
821 * must be converted to true pts/dts before they are stored in AVPacket.
825 * Decompression timestamp in AVStream->time_base units; the time at which
826 * the packet is decompressed.
827 * Can be AV_NOPTS_VALUE if it is not stored in the file.
834 * A combination of AV_PKT_FLAG values
838 * Additional packet data that can be provided by the container.
839 * Packet can contain several types of side information.
844 enum AVPacketSideDataType type;
849 * Duration of this packet in AVStream->time_base units, 0 if unknown.
850 * Equals next_pts - this_pts in presentation order.
853 void (*destruct)(struct AVPacket *);
855 int64_t pos; ///< byte position in stream, -1 if unknown
858 * Time difference in AVStream->time_base units from the pts of this
859 * packet to the point at which the output from the decoder has converged
860 * independent from the availability of previous frames. That is, the
861 * frames are virtually identical no matter if decoding started from
862 * the very first frame or from this keyframe.
863 * Is AV_NOPTS_VALUE if unknown.
864 * This field is not the display duration of the current packet.
865 * This field has no meaning if the packet does not have AV_PKT_FLAG_KEY
868 * The purpose of this field is to allow seeking in streams that have no
869 * keyframes in the conventional sense. It corresponds to the
870 * recovery point SEI in H.264 and match_time_delta in NUT. It is also
871 * essential for some types of subtitle streams to ensure that all
872 * subtitles are correctly displayed after seeking.
874 int64_t convergence_duration;
876 #define AV_PKT_FLAG_KEY 0x0001 ///< The packet contains a keyframe
877 #define AV_PKT_FLAG_CORRUPT 0x0002 ///< The packet content is corrupted
881 * New fields can be added to the end of AVFRAME with minor version
882 * bumps. Removal, reordering and changes to existing fields require
883 * a major version bump.
884 * sizeof(AVFrame) must not be used outside libav*.
886 typedef struct AVFrame {
888 * pointer to the picture planes.
889 * This might be different from the first allocated byte
896 * pointer to the first allocated byte of the picture. Can be used in get_buffer/release_buffer.
897 * This isn't used by libavcodec unless the default get/release_buffer() is used.
903 * 1 -> keyframe, 0-> not
904 * - encoding: Set by libavcodec.
905 * - decoding: Set by libavcodec.
910 * Picture type of the frame, see ?_TYPE below.
911 * - encoding: Set by libavcodec. for coded_picture (and set by user for input).
912 * - decoding: Set by libavcodec.
914 enum AVPictureType pict_type;
917 * presentation timestamp in time_base units (time when frame should be shown to user)
918 * If AV_NOPTS_VALUE then frame_rate = 1/time_base will be assumed.
919 * - encoding: MUST be set by user.
920 * - decoding: Set by libavcodec.
925 * picture number in bitstream order
927 * - decoding: Set by libavcodec.
929 int coded_picture_number;
931 * picture number in display order
933 * - decoding: Set by libavcodec.
935 int display_picture_number;
938 * quality (between 1 (good) and FF_LAMBDA_MAX (bad))
939 * - encoding: Set by libavcodec. for coded_picture (and set by user for input).
940 * - decoding: Set by libavcodec.
945 * buffer age (1->was last buffer and dint change, 2->..., ...).
946 * Set to INT_MAX if the buffer has not been used yet.
948 * - decoding: MUST be set by get_buffer().
953 * is this picture used as reference
954 * The values for this are the same as the MpegEncContext.picture_structure
955 * variable, that is 1->top field, 2->bottom field, 3->frame/both fields.
956 * Set to 4 for delayed, non-reference frames.
958 * - decoding: Set by libavcodec. (before get_buffer() call)).
965 * - decoding: Set by libavcodec.
967 int8_t *qscale_table;
971 * - decoding: Set by libavcodec.
976 * mbskip_table[mb]>=1 if MB didn't change
977 * stride= mb_width = (width+15)>>4
979 * - decoding: Set by libavcodec.
981 uint8_t *mbskip_table;
984 * motion vector table
987 * int mv_sample_log2= 4 - motion_subsample_log2;
988 * int mb_width= (width+15)>>4;
989 * int mv_stride= (mb_width << mv_sample_log2) + 1;
990 * motion_val[direction][x + y*mv_stride][0->mv_x, 1->mv_y];
992 * - encoding: Set by user.
993 * - decoding: Set by libavcodec.
995 int16_t (*motion_val[2])[2];
998 * macroblock type table
999 * mb_type_base + mb_width + 2
1000 * - encoding: Set by user.
1001 * - decoding: Set by libavcodec.
1006 * log2 of the size of the block which a single vector in motion_val represents:
1007 * (4->16x16, 3->8x8, 2-> 4x4, 1-> 2x2)
1008 * - encoding: unused
1009 * - decoding: Set by libavcodec.
1011 uint8_t motion_subsample_log2;
1014 * for some private data of the user
1015 * - encoding: unused
1016 * - decoding: Set by user.
1022 * - encoding: Set by libavcodec. if flags&CODEC_FLAG_PSNR.
1023 * - decoding: unused
1028 * type of the buffer (to keep track of who has to deallocate data[*])
1029 * - encoding: Set by the one who allocates it.
1030 * - decoding: Set by the one who allocates it.
1031 * Note: User allocated (direct rendering) & internal buffers cannot coexist currently.
1036 * When decoding, this signals how much the picture must be delayed.
1037 * extra_delay = repeat_pict / (2*fps)
1038 * - encoding: unused
1039 * - decoding: Set by libavcodec.
1049 * The content of the picture is interlaced.
1050 * - encoding: Set by user.
1051 * - decoding: Set by libavcodec. (default 0)
1053 int interlaced_frame;
1056 * If the content is interlaced, is top field displayed first.
1057 * - encoding: Set by user.
1058 * - decoding: Set by libavcodec.
1060 int top_field_first;
1064 * - encoding: Set by user.
1065 * - decoding: Set by libavcodec.
1067 AVPanScan *pan_scan;
1070 * Tell user application that palette has changed from previous frame.
1071 * - encoding: ??? (no palette-enabled encoder yet)
1072 * - decoding: Set by libavcodec. (default 0).
1074 int palette_has_changed;
1077 * codec suggestion on buffer type if != 0
1078 * - encoding: unused
1079 * - decoding: Set by libavcodec. (before get_buffer() call)).
1085 * - encoding: unused
1086 * - decoding: Set by libavcodec.
1091 * motion reference frame index
1092 * the order in which these are stored can depend on the codec.
1093 * - encoding: Set by user.
1094 * - decoding: Set by libavcodec.
1096 int8_t *ref_index[2];
1099 * reordered opaque 64bit (generally an integer or a double precision float
1100 * PTS but can be anything).
1101 * The user sets AVCodecContext.reordered_opaque to represent the input at
1103 * the decoder reorders values as needed and sets AVFrame.reordered_opaque
1104 * to exactly one of the values provided by the user through AVCodecContext.reordered_opaque
1105 * @deprecated in favor of pkt_pts
1106 * - encoding: unused
1107 * - decoding: Read by user.
1109 int64_t reordered_opaque;
1112 * hardware accelerator private data (FFmpeg-allocated)
1113 * - encoding: unused
1114 * - decoding: Set by libavcodec
1116 void *hwaccel_picture_private;
1119 * reordered pts from the last AVPacket that has been input into the decoder
1120 * - encoding: unused
1121 * - decoding: Read by user.
1126 * dts from the last AVPacket that has been input into the decoder
1127 * - encoding: unused
1128 * - decoding: Read by user.
1133 * the AVCodecContext which ff_thread_get_buffer() was last called on
1134 * - encoding: Set by libavcodec.
1135 * - decoding: Set by libavcodec.
1137 struct AVCodecContext *owner;
1140 * used by multithreading to store frame-specific info
1141 * - encoding: Set by libavcodec.
1142 * - decoding: Set by libavcodec.
1144 void *thread_opaque;
1147 * frame timestamp estimated using various heuristics, in stream time base
1148 * - encoding: unused
1149 * - decoding: set by libavcodec, read by user.
1151 int64_t best_effort_timestamp;
1154 * reordered pos from the last AVPacket that has been input into the decoder
1155 * - encoding: unused
1156 * - decoding: Read by user.
1161 * reordered sample aspect ratio for the video frame, 0/1 if unknown\unspecified
1162 * - encoding: unused
1163 * - decoding: Read by user.
1165 AVRational sample_aspect_ratio;
1168 * width and height of the video frame
1169 * - encoding: unused
1170 * - decoding: Read by user.
1175 * format of the frame, -1 if unknown or unset
1176 * It should be cast to the corresponding enum (enum PixelFormat
1177 * for video, enum AVSampleFormat for audio)
1178 * - encoding: unused
1179 * - decoding: Read by user.
1186 * main external API structure.
1187 * New fields can be added to the end with minor version bumps.
1188 * Removal, reordering and changes to existing fields require a major
1190 * Please use AVOptions (av_opt* / av_set/get*()) to access these fields from user
1192 * sizeof(AVCodecContext) must not be used outside libav*.
1194 typedef struct AVCodecContext {
1196 * information on struct for av_log
1197 * - set by avcodec_alloc_context
1199 const AVClass *av_class;
1201 * the average bitrate
1202 * - encoding: Set by user; unused for constant quantizer encoding.
1203 * - decoding: Set by libavcodec. 0 or some bitrate if this info is available in the stream.
1208 * number of bits the bitstream is allowed to diverge from the reference.
1209 * the reference can be CBR (for CBR pass1) or VBR (for pass2)
1210 * - encoding: Set by user; unused for constant quantizer encoding.
1211 * - decoding: unused
1213 int bit_rate_tolerance;
1217 * - encoding: Set by user.
1218 * - decoding: Set by user.
1223 * Some codecs need additional format info. It is stored here.
1224 * If any muxer uses this then ALL demuxers/parsers AND encoders for the
1225 * specific codec MUST set it correctly otherwise stream copy breaks.
1226 * In general use of this field by muxers is not recommanded.
1227 * - encoding: Set by libavcodec.
1228 * - decoding: Set by libavcodec. (FIXME: Is this OK?)
1233 * Motion estimation algorithm used for video coding.
1234 * 1 (zero), 2 (full), 3 (log), 4 (phods), 5 (epzs), 6 (x1), 7 (hex),
1235 * 8 (umh), 9 (iter), 10 (tesa) [7, 8, 10 are x264 specific, 9 is snow specific]
1236 * - encoding: MUST be set by user.
1237 * - decoding: unused
1242 * some codecs need / can use extradata like Huffman tables.
1243 * mjpeg: Huffman tables
1244 * rv10: additional flags
1245 * mpeg4: global headers (they can be in the bitstream or here)
1246 * The allocated memory should be FF_INPUT_BUFFER_PADDING_SIZE bytes larger
1247 * than extradata_size to avoid prolems if it is read with the bitstream reader.
1248 * The bytewise contents of extradata must not depend on the architecture or CPU endianness.
1249 * - encoding: Set/allocated/freed by libavcodec.
1250 * - decoding: Set/allocated/freed by user.
1256 * This is the fundamental unit of time (in seconds) in terms
1257 * of which frame timestamps are represented. For fixed-fps content,
1258 * timebase should be 1/framerate and timestamp increments should be
1260 * - encoding: MUST be set by user.
1261 * - decoding: Set by libavcodec.
1263 AVRational time_base;
1267 * picture width / height.
1268 * - encoding: MUST be set by user.
1269 * - decoding: Set by libavcodec.
1270 * Note: For compatibility it is possible to set this instead of
1271 * coded_width/height before decoding.
1275 #define FF_ASPECT_EXTENDED 15
1278 * the number of pictures in a group of pictures, or 0 for intra_only
1279 * - encoding: Set by user.
1280 * - decoding: unused
1285 * Pixel format, see PIX_FMT_xxx.
1286 * May be set by the demuxer if known from headers.
1287 * May be overriden by the decoder if it knows better.
1288 * - encoding: Set by user.
1289 * - decoding: Set by user if known, overridden by libavcodec if known
1291 enum PixelFormat pix_fmt;
1294 * If non NULL, 'draw_horiz_band' is called by the libavcodec
1295 * decoder to draw a horizontal band. It improves cache usage. Not
1296 * all codecs can do that. You must check the codec capabilities
1298 * When multithreading is used, it may be called from multiple threads
1299 * at the same time; threads might draw different parts of the same AVFrame,
1300 * or multiple AVFrames, and there is no guarantee that slices will be drawn
1302 * The function is also used by hardware acceleration APIs.
1303 * It is called at least once during frame decoding to pass
1304 * the data needed for hardware render.
1305 * In that mode instead of pixel data, AVFrame points to
1306 * a structure specific to the acceleration API. The application
1307 * reads the structure and can change some fields to indicate progress
1309 * - encoding: unused
1310 * - decoding: Set by user.
1311 * @param height the height of the slice
1312 * @param y the y position of the slice
1313 * @param type 1->top field, 2->bottom field, 3->frame
1314 * @param offset offset into the AVFrame.data from which the slice should be read
1316 void (*draw_horiz_band)(struct AVCodecContext *s,
1317 const AVFrame *src, int offset[4],
1318 int y, int type, int height);
1321 int sample_rate; ///< samples per second
1322 int channels; ///< number of audio channels
1325 * audio sample format
1326 * - encoding: Set by user.
1327 * - decoding: Set by libavcodec.
1329 enum AVSampleFormat sample_fmt; ///< sample format
1331 /* The following data should not be initialized. */
1333 * Samples per packet, initialized when calling 'init'.
1336 int frame_number; ///< audio or video frame number
1339 * Number of frames the decoded output will be delayed relative to
1340 * the encoded input.
1341 * - encoding: Set by libavcodec.
1342 * - decoding: unused
1346 /* - encoding parameters */
1347 float qcompress; ///< amount of qscale change between easy & hard scenes (0.0-1.0)
1348 float qblur; ///< amount of qscale smoothing over time (0.0-1.0)
1352 * - encoding: Set by user.
1353 * - decoding: unused
1359 * - encoding: Set by user.
1360 * - decoding: unused
1365 * maximum quantizer difference between frames
1366 * - encoding: Set by user.
1367 * - decoding: unused
1372 * maximum number of B-frames between non-B-frames
1373 * Note: The output will be delayed by max_b_frames+1 relative to the input.
1374 * - encoding: Set by user.
1375 * - decoding: unused
1380 * qscale factor between IP and B-frames
1381 * If > 0 then the last P-frame quantizer will be used (q= lastp_q*factor+offset).
1382 * If < 0 then normal ratecontrol will be done (q= -normal_q*factor+offset).
1383 * - encoding: Set by user.
1384 * - decoding: unused
1386 float b_quant_factor;
1388 /** obsolete FIXME remove */
1390 #define FF_RC_STRATEGY_XVID 1
1392 int b_frame_strategy;
1394 struct AVCodec *codec;
1398 int rtp_payload_size; /* The size of the RTP payload: the coder will */
1399 /* do its best to deliver a chunk with size */
1400 /* below rtp_payload_size, the chunk will start */
1401 /* with a start code on some codecs like H.263. */
1402 /* This doesn't take account of any particular */
1403 /* headers inside the transmitted RTP payload. */
1406 /* The RTP callback: This function is called */
1407 /* every time the encoder has a packet to send. */
1408 /* It depends on the encoder if the data starts */
1409 /* with a Start Code (it should). H.263 does. */
1410 /* mb_nb contains the number of macroblocks */
1411 /* encoded in the RTP payload. */
1412 void (*rtp_callback)(struct AVCodecContext *avctx, void *data, int size, int mb_nb);
1414 /* statistics, used for 2-pass encoding */
1425 * number of bits used for the previously encoded frame
1426 * - encoding: Set by libavcodec.
1427 * - decoding: unused
1432 * Private data of the user, can be used to carry app specific stuff.
1433 * - encoding: Set by user.
1434 * - decoding: Set by user.
1438 char codec_name[32];
1439 enum AVMediaType codec_type; /* see AVMEDIA_TYPE_xxx */
1440 enum CodecID codec_id; /* see CODEC_ID_xxx */
1443 * fourcc (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A').
1444 * This is used to work around some encoder bugs.
1445 * A demuxer should set this to what is stored in the field used to identify the codec.
1446 * If there are multiple such fields in a container then the demuxer should choose the one
1447 * which maximizes the information about the used codec.
1448 * If the codec tag field in a container is larger than 32 bits then the demuxer should
1449 * remap the longer ID to 32 bits with a table or other structure. Alternatively a new
1450 * extra_codec_tag + size could be added but for this a clear advantage must be demonstrated
1452 * - encoding: Set by user, if not then the default based on codec_id will be used.
1453 * - decoding: Set by user, will be converted to uppercase by libavcodec during init.
1455 unsigned int codec_tag;
1458 * Work around bugs in encoders which sometimes cannot be detected automatically.
1459 * - encoding: Set by user
1460 * - decoding: Set by user
1462 int workaround_bugs;
1463 #define FF_BUG_AUTODETECT 1 ///< autodetection
1464 #define FF_BUG_OLD_MSMPEG4 2
1465 #define FF_BUG_XVID_ILACE 4
1466 #define FF_BUG_UMP4 8
1467 #define FF_BUG_NO_PADDING 16
1468 #define FF_BUG_AMV 32
1469 #define FF_BUG_AC_VLC 0 ///< Will be removed, libavcodec can now handle these non-compliant files by default.
1470 #define FF_BUG_QPEL_CHROMA 64
1471 #define FF_BUG_STD_QPEL 128
1472 #define FF_BUG_QPEL_CHROMA2 256
1473 #define FF_BUG_DIRECT_BLOCKSIZE 512
1474 #define FF_BUG_EDGE 1024
1475 #define FF_BUG_HPEL_CHROMA 2048
1476 #define FF_BUG_DC_CLIP 4096
1477 #define FF_BUG_MS 8192 ///< Work around various bugs in Microsoft's broken decoders.
1478 #define FF_BUG_TRUNCATED 16384
1479 //#define FF_BUG_FAKE_SCALABILITY 16 //Autodetection should work 100%.
1482 * luma single coefficient elimination threshold
1483 * - encoding: Set by user.
1484 * - decoding: unused
1486 int luma_elim_threshold;
1489 * chroma single coeff elimination threshold
1490 * - encoding: Set by user.
1491 * - decoding: unused
1493 int chroma_elim_threshold;
1496 * strictly follow the standard (MPEG4, ...).
1497 * - encoding: Set by user.
1498 * - decoding: Set by user.
1499 * Setting this to STRICT or higher means the encoder and decoder will
1500 * generally do stupid things, whereas setting it to unofficial or lower
1501 * will mean the encoder might produce output that is not supported by all
1502 * spec-compliant decoders. Decoders don't differentiate between normal,
1503 * unofficial and experimental (that is, they always try to decode things
1504 * when they can) unless they are explicitly asked to behave stupidly
1505 * (=strictly conform to the specs)
1507 int strict_std_compliance;
1508 #define FF_COMPLIANCE_VERY_STRICT 2 ///< Strictly conform to an older more strict version of the spec or reference software.
1509 #define FF_COMPLIANCE_STRICT 1 ///< Strictly conform to all the things in the spec no matter what consequences.
1510 #define FF_COMPLIANCE_NORMAL 0
1511 #define FF_COMPLIANCE_UNOFFICIAL -1 ///< Allow unofficial extensions
1512 #define FF_COMPLIANCE_EXPERIMENTAL -2 ///< Allow nonstandardized experimental things.
1515 * qscale offset between IP and B-frames
1516 * - encoding: Set by user.
1517 * - decoding: unused
1519 float b_quant_offset;
1523 * Error recognition; higher values will detect more errors but may
1524 * misdetect some more or less valid parts as errors.
1525 * - encoding: unused
1526 * - decoding: Set by user.
1528 attribute_deprecated int error_recognition;
1529 #define FF_ER_CAREFUL 1
1530 #define FF_ER_COMPLIANT 2
1531 #define FF_ER_AGGRESSIVE 3
1532 #define FF_ER_VERY_AGGRESSIVE 4
1533 #define FF_ER_EXPLODE 5
1534 #endif /* FF_API_ER */
1537 * Called at the beginning of each frame to get a buffer for it.
1538 * If pic.reference is set then the frame will be read later by libavcodec.
1539 * avcodec_align_dimensions2() should be used to find the required width and
1540 * height, as they normally need to be rounded up to the next multiple of 16.
1541 * if CODEC_CAP_DR1 is not set then get_buffer() must call
1542 * avcodec_default_get_buffer() instead of providing buffers allocated by
1544 * If frame multithreading is used and thread_safe_callbacks is set,
1545 * it may be called from a different thread, but not from more than one at once.
1546 * Does not need to be reentrant.
1547 * - encoding: unused
1548 * - decoding: Set by libavcodec, user can override.
1550 int (*get_buffer)(struct AVCodecContext *c, AVFrame *pic);
1553 * Called to release buffers which were allocated with get_buffer.
1554 * A released buffer can be reused in get_buffer().
1555 * pic.data[*] must be set to NULL.
1556 * May be called from a different thread if frame multithreading is used,
1557 * but not by more than one thread at once, so does not need to be reentrant.
1558 * - encoding: unused
1559 * - decoding: Set by libavcodec, user can override.
1561 void (*release_buffer)(struct AVCodecContext *c, AVFrame *pic);
1564 * Size of the frame reordering buffer in the decoder.
1565 * For MPEG-2 it is 1 IPB or 0 low delay IP.
1566 * - encoding: Set by libavcodec.
1567 * - decoding: Set by libavcodec.
1572 * number of bytes per packet if constant and known or 0
1573 * Used by some WAV based audio codecs.
1577 int parse_only; /* - decoding only: If true, only parsing is done
1578 (function avcodec_parse_frame()). The frame
1579 data is returned. Only MPEG codecs support this now. */
1582 * 0-> h263 quant 1-> mpeg quant
1583 * - encoding: Set by user.
1584 * - decoding: unused
1589 * pass1 encoding statistics output buffer
1590 * - encoding: Set by libavcodec.
1591 * - decoding: unused
1596 * pass2 encoding statistics input buffer
1597 * Concatenated stuff from stats_out of pass1 should be placed here.
1598 * - encoding: Allocated/set/freed by user.
1599 * - decoding: unused
1604 * ratecontrol qmin qmax limiting method
1605 * 0-> clipping, 1-> use a nice continous function to limit qscale wthin qmin/qmax.
1606 * - encoding: Set by user.
1607 * - decoding: unused
1615 * ratecontrol override, see RcOverride
1616 * - encoding: Allocated/set/freed by user.
1617 * - decoding: unused
1619 RcOverride *rc_override;
1620 int rc_override_count;
1623 * rate control equation
1624 * - encoding: Set by user
1625 * - decoding: unused
1631 * - encoding: Set by user.
1632 * - decoding: unused
1638 * - encoding: Set by user.
1639 * - decoding: unused
1644 * decoder bitstream buffer size
1645 * - encoding: Set by user.
1646 * - decoding: unused
1649 float rc_buffer_aggressivity;
1652 * qscale factor between P and I-frames
1653 * If > 0 then the last p frame quantizer will be used (q= lastp_q*factor+offset).
1654 * If < 0 then normal ratecontrol will be done (q= -normal_q*factor+offset).
1655 * - encoding: Set by user.
1656 * - decoding: unused
1658 float i_quant_factor;
1661 * qscale offset between P and I-frames
1662 * - encoding: Set by user.
1663 * - decoding: unused
1665 float i_quant_offset;
1668 * initial complexity for pass1 ratecontrol
1669 * - encoding: Set by user.
1670 * - decoding: unused
1672 float rc_initial_cplx;
1675 * DCT algorithm, see FF_DCT_* below
1676 * - encoding: Set by user.
1677 * - decoding: unused
1680 #define FF_DCT_AUTO 0
1681 #define FF_DCT_FASTINT 1
1682 #define FF_DCT_INT 2
1683 #define FF_DCT_MMX 3
1684 #define FF_DCT_MLIB 4
1685 #define FF_DCT_ALTIVEC 5
1686 #define FF_DCT_FAAN 6
1689 * luminance masking (0-> disabled)
1690 * - encoding: Set by user.
1691 * - decoding: unused
1696 * temporary complexity masking (0-> disabled)
1697 * - encoding: Set by user.
1698 * - decoding: unused
1700 float temporal_cplx_masking;
1703 * spatial complexity masking (0-> disabled)
1704 * - encoding: Set by user.
1705 * - decoding: unused
1707 float spatial_cplx_masking;
1710 * p block masking (0-> disabled)
1711 * - encoding: Set by user.
1712 * - decoding: unused
1717 * darkness masking (0-> disabled)
1718 * - encoding: Set by user.
1719 * - decoding: unused
1724 * IDCT algorithm, see FF_IDCT_* below.
1725 * - encoding: Set by user.
1726 * - decoding: Set by user.
1729 #define FF_IDCT_AUTO 0
1730 #define FF_IDCT_INT 1
1731 #define FF_IDCT_SIMPLE 2
1732 #define FF_IDCT_SIMPLEMMX 3
1733 #define FF_IDCT_LIBMPEG2MMX 4
1734 #define FF_IDCT_PS2 5
1735 #define FF_IDCT_MLIB 6
1736 #define FF_IDCT_ARM 7
1737 #define FF_IDCT_ALTIVEC 8
1738 #define FF_IDCT_SH4 9
1739 #define FF_IDCT_SIMPLEARM 10
1740 #define FF_IDCT_H264 11
1741 #define FF_IDCT_VP3 12
1742 #define FF_IDCT_IPP 13
1743 #define FF_IDCT_XVIDMMX 14
1744 #define FF_IDCT_CAVS 15
1745 #define FF_IDCT_SIMPLEARMV5TE 16
1746 #define FF_IDCT_SIMPLEARMV6 17
1747 #define FF_IDCT_SIMPLEVIS 18
1748 #define FF_IDCT_WMV2 19
1749 #define FF_IDCT_FAAN 20
1750 #define FF_IDCT_EA 21
1751 #define FF_IDCT_SIMPLENEON 22
1752 #define FF_IDCT_SIMPLEALPHA 23
1753 #define FF_IDCT_BINK 24
1757 * - encoding: Set by libavcodec.
1758 * - decoding: Set by user (or 0).
1762 * slice offsets in the frame in bytes
1763 * - encoding: Set/allocated by libavcodec.
1764 * - decoding: Set/allocated by user (or NULL).
1769 * error concealment flags
1770 * - encoding: unused
1771 * - decoding: Set by user.
1773 int error_concealment;
1774 #define FF_EC_GUESS_MVS 1
1775 #define FF_EC_DEBLOCK 2
1778 * dsp_mask could be add used to disable unwanted CPU features
1779 * CPU features (i.e. MMX, SSE. ...)
1781 * With the FORCE flag you may instead enable given CPU features.
1782 * (Dangerous: Usable in case of misdetection, improper usage however will
1783 * result into program crash.)
1788 * bits per sample/pixel from the demuxer (needed for huffyuv).
1789 * - encoding: Set by libavcodec.
1790 * - decoding: Set by user.
1792 int bits_per_coded_sample;
1795 * prediction method (needed for huffyuv)
1796 * - encoding: Set by user.
1797 * - decoding: unused
1799 int prediction_method;
1800 #define FF_PRED_LEFT 0
1801 #define FF_PRED_PLANE 1
1802 #define FF_PRED_MEDIAN 2
1805 * sample aspect ratio (0 if unknown)
1806 * That is the width of a pixel divided by the height of the pixel.
1807 * Numerator and denominator must be relatively prime and smaller than 256 for some video standards.
1808 * - encoding: Set by user.
1809 * - decoding: Set by libavcodec.
1811 AVRational sample_aspect_ratio;
1814 * the picture in the bitstream
1815 * - encoding: Set by libavcodec.
1816 * - decoding: Set by libavcodec.
1818 AVFrame *coded_frame;
1822 * - encoding: Set by user.
1823 * - decoding: Set by user.
1826 #define FF_DEBUG_PICT_INFO 1
1827 #define FF_DEBUG_RC 2
1828 #define FF_DEBUG_BITSTREAM 4
1829 #define FF_DEBUG_MB_TYPE 8
1830 #define FF_DEBUG_QP 16
1831 #define FF_DEBUG_MV 32
1832 #define FF_DEBUG_DCT_COEFF 0x00000040
1833 #define FF_DEBUG_SKIP 0x00000080
1834 #define FF_DEBUG_STARTCODE 0x00000100
1835 #define FF_DEBUG_PTS 0x00000200
1836 #define FF_DEBUG_ER 0x00000400
1837 #define FF_DEBUG_MMCO 0x00000800
1838 #define FF_DEBUG_BUGS 0x00001000
1839 #define FF_DEBUG_VIS_QP 0x00002000
1840 #define FF_DEBUG_VIS_MB_TYPE 0x00004000
1841 #define FF_DEBUG_BUFFERS 0x00008000
1842 #define FF_DEBUG_THREADS 0x00010000
1846 * - encoding: Set by user.
1847 * - decoding: Set by user.
1850 #define FF_DEBUG_VIS_MV_P_FOR 0x00000001 //visualize forward predicted MVs of P frames
1851 #define FF_DEBUG_VIS_MV_B_FOR 0x00000002 //visualize forward predicted MVs of B frames
1852 #define FF_DEBUG_VIS_MV_B_BACK 0x00000004 //visualize backward predicted MVs of B frames
1856 * - encoding: Set by libavcodec if flags&CODEC_FLAG_PSNR.
1857 * - decoding: unused
1862 * motion estimation comparison function
1863 * - encoding: Set by user.
1864 * - decoding: unused
1868 * subpixel motion estimation comparison function
1869 * - encoding: Set by user.
1870 * - decoding: unused
1874 * macroblock comparison function (not supported yet)
1875 * - encoding: Set by user.
1876 * - decoding: unused
1880 * interlaced DCT comparison function
1881 * - encoding: Set by user.
1882 * - decoding: unused
1885 #define FF_CMP_SAD 0
1886 #define FF_CMP_SSE 1
1887 #define FF_CMP_SATD 2
1888 #define FF_CMP_DCT 3
1889 #define FF_CMP_PSNR 4
1890 #define FF_CMP_BIT 5
1892 #define FF_CMP_ZERO 7
1893 #define FF_CMP_VSAD 8
1894 #define FF_CMP_VSSE 9
1895 #define FF_CMP_NSSE 10
1896 #define FF_CMP_W53 11
1897 #define FF_CMP_W97 12
1898 #define FF_CMP_DCTMAX 13
1899 #define FF_CMP_DCT264 14
1900 #define FF_CMP_CHROMA 256
1903 * ME diamond size & shape
1904 * - encoding: Set by user.
1905 * - decoding: unused
1910 * amount of previous MV predictors (2a+1 x 2a+1 square)
1911 * - encoding: Set by user.
1912 * - decoding: unused
1914 int last_predictor_count;
1917 * prepass for motion estimation
1918 * - encoding: Set by user.
1919 * - decoding: unused
1924 * motion estimation prepass comparison function
1925 * - encoding: Set by user.
1926 * - decoding: unused
1931 * ME prepass diamond size & shape
1932 * - encoding: Set by user.
1933 * - decoding: unused
1939 * - encoding: Set by user.
1940 * - decoding: unused
1942 int me_subpel_quality;
1945 * callback to negotiate the pixelFormat
1946 * @param fmt is the list of formats which are supported by the codec,
1947 * it is terminated by -1 as 0 is a valid format, the formats are ordered by quality.
1948 * The first is always the native one.
1949 * @return the chosen format
1950 * - encoding: unused
1951 * - decoding: Set by user, if not set the native format will be chosen.
1953 enum PixelFormat (*get_format)(struct AVCodecContext *s, const enum PixelFormat * fmt);
1956 * DTG active format information (additional aspect ratio
1957 * information only used in DVB MPEG-2 transport streams)
1960 * - encoding: unused
1961 * - decoding: Set by decoder.
1963 int dtg_active_format;
1964 #define FF_DTG_AFD_SAME 8
1965 #define FF_DTG_AFD_4_3 9
1966 #define FF_DTG_AFD_16_9 10
1967 #define FF_DTG_AFD_14_9 11
1968 #define FF_DTG_AFD_4_3_SP_14_9 13
1969 #define FF_DTG_AFD_16_9_SP_14_9 14
1970 #define FF_DTG_AFD_SP_4_3 15
1973 * maximum motion estimation search range in subpel units
1974 * If 0 then no limit.
1976 * - encoding: Set by user.
1977 * - decoding: unused
1982 * intra quantizer bias
1983 * - encoding: Set by user.
1984 * - decoding: unused
1986 int intra_quant_bias;
1987 #define FF_DEFAULT_QUANT_BIAS 999999
1990 * inter quantizer bias
1991 * - encoding: Set by user.
1992 * - decoding: unused
1994 int inter_quant_bias;
1998 * - encoding: unused
1999 * - decoding: Which clrtable should be used for 8bit RGB images.
2000 * Tables have to be stored somewhere. FIXME
2005 * internal_buffer count
2006 * Don't touch, used by libavcodec default_get_buffer().
2008 int internal_buffer_count;
2012 * Don't touch, used by libavcodec default_get_buffer().
2014 void *internal_buffer;
2017 * Global quality for codecs which cannot change it per frame.
2018 * This should be proportional to MPEG-1/2/4 qscale.
2019 * - encoding: Set by user.
2020 * - decoding: unused
2024 #define FF_CODER_TYPE_VLC 0
2025 #define FF_CODER_TYPE_AC 1
2026 #define FF_CODER_TYPE_RAW 2
2027 #define FF_CODER_TYPE_RLE 3
2028 #define FF_CODER_TYPE_DEFLATE 4
2031 * - encoding: Set by user.
2032 * - decoding: unused
2038 * - encoding: Set by user.
2039 * - decoding: unused
2045 * - encoding: unused
2046 * - decoding: Set by user.
2048 uint8_t * (*realloc)(struct AVCodecContext *s, uint8_t *buf, int buf_size);
2053 * - encoding: unused
2054 * - decoding: Set by user.
2057 #define SLICE_FLAG_CODED_ORDER 0x0001 ///< draw_horiz_band() is called in coded order instead of display
2058 #define SLICE_FLAG_ALLOW_FIELD 0x0002 ///< allow draw_horiz_band() with field slices (MPEG2 field pics)
2059 #define SLICE_FLAG_ALLOW_PLANE 0x0004 ///< allow draw_horiz_band() with 1 component at a time (SVQ1)
2062 * XVideo Motion Acceleration
2063 * - encoding: forbidden
2064 * - decoding: set by decoder
2066 int xvmc_acceleration;
2069 * macroblock decision mode
2070 * - encoding: Set by user.
2071 * - decoding: unused
2074 #define FF_MB_DECISION_SIMPLE 0 ///< uses mb_cmp
2075 #define FF_MB_DECISION_BITS 1 ///< chooses the one which needs the fewest bits
2076 #define FF_MB_DECISION_RD 2 ///< rate distortion
2079 * custom intra quantization matrix
2080 * - encoding: Set by user, can be NULL.
2081 * - decoding: Set by libavcodec.
2083 uint16_t *intra_matrix;
2086 * custom inter quantization matrix
2087 * - encoding: Set by user, can be NULL.
2088 * - decoding: Set by libavcodec.
2090 uint16_t *inter_matrix;
2093 * fourcc from the AVI stream header (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A').
2094 * This is used to work around some encoder bugs.
2095 * - encoding: unused
2096 * - decoding: Set by user, will be converted to uppercase by libavcodec during init.
2098 unsigned int stream_codec_tag;
2101 * scene change detection threshold
2102 * 0 is default, larger means fewer detected scene changes.
2103 * - encoding: Set by user.
2104 * - decoding: unused
2106 int scenechange_threshold;
2109 * minimum Lagrange multipler
2110 * - encoding: Set by user.
2111 * - decoding: unused
2116 * maximum Lagrange multipler
2117 * - encoding: Set by user.
2118 * - decoding: unused
2122 #if FF_API_PALETTE_CONTROL
2124 * palette control structure
2125 * - encoding: ??? (no palette-enabled encoder yet)
2126 * - decoding: Set by user.
2128 struct AVPaletteControl *palctrl;
2132 * noise reduction strength
2133 * - encoding: Set by user.
2134 * - decoding: unused
2136 int noise_reduction;
2139 * Called at the beginning of a frame to get cr buffer for it.
2140 * Buffer type (size, hints) must be the same. libavcodec won't check it.
2141 * libavcodec will pass previous buffer in pic, function should return
2142 * same buffer or new buffer with old frame "painted" into it.
2143 * If pic.data[0] == NULL must behave like get_buffer().
2144 * if CODEC_CAP_DR1 is not set then reget_buffer() must call
2145 * avcodec_default_reget_buffer() instead of providing buffers allocated by
2147 * - encoding: unused
2148 * - decoding: Set by libavcodec, user can override.
2150 int (*reget_buffer)(struct AVCodecContext *c, AVFrame *pic);
2153 * Number of bits which should be loaded into the rc buffer before decoding starts.
2154 * - encoding: Set by user.
2155 * - decoding: unused
2157 int rc_initial_buffer_occupancy;
2161 * - encoding: Set by user.
2162 * - decoding: unused
2164 int inter_threshold;
2168 * - encoding: Set by user.
2169 * - decoding: Set by user.
2174 * Simulates errors in the bitstream to test error concealment.
2175 * - encoding: Set by user.
2176 * - decoding: unused
2180 #if FF_API_ANTIALIAS_ALGO
2182 * MP3 antialias algorithm, see FF_AA_* below.
2183 * - encoding: unused
2184 * - decoding: Set by user.
2186 attribute_deprecated int antialias_algo;
2187 #define FF_AA_AUTO 0
2188 #define FF_AA_FASTINT 1 //not implemented yet
2190 #define FF_AA_FLOAT 3
2194 * quantizer noise shaping
2195 * - encoding: Set by user.
2196 * - decoding: unused
2198 int quantizer_noise_shaping;
2202 * is used to decide how many independent tasks should be passed to execute()
2203 * - encoding: Set by user.
2204 * - decoding: Set by user.
2209 * The codec may call this to execute several independent things.
2210 * It will return only after finishing all tasks.
2211 * The user may replace this with some multithreaded implementation,
2212 * the default implementation will execute the parts serially.
2213 * @param count the number of things to execute
2214 * - encoding: Set by libavcodec, user can override.
2215 * - decoding: Set by libavcodec, user can override.
2217 int (*execute)(struct AVCodecContext *c, int (*func)(struct AVCodecContext *c2, void *arg), void *arg2, int *ret, int count, int size);
2221 * Can be used by execute() to store some per AVCodecContext stuff.
2222 * - encoding: set by execute()
2223 * - decoding: set by execute()
2225 void *thread_opaque;
2228 * Motion estimation threshold below which no motion estimation is
2229 * performed, but instead the user specified motion vectors are used.
2231 * - encoding: Set by user.
2232 * - decoding: unused
2237 * Macroblock threshold below which the user specified macroblock types will be used.
2238 * - encoding: Set by user.
2239 * - decoding: unused
2244 * precision of the intra DC coefficient - 8
2245 * - encoding: Set by user.
2246 * - decoding: unused
2248 int intra_dc_precision;
2251 * noise vs. sse weight for the nsse comparsion function
2252 * - encoding: Set by user.
2253 * - decoding: unused
2258 * Number of macroblock rows at the top which are skipped.
2259 * - encoding: unused
2260 * - decoding: Set by user.
2265 * Number of macroblock rows at the bottom which are skipped.
2266 * - encoding: unused
2267 * - decoding: Set by user.
2273 * - encoding: Set by user.
2274 * - decoding: Set by libavcodec.
2277 #define FF_PROFILE_UNKNOWN -99
2278 #define FF_PROFILE_RESERVED -100
2280 #define FF_PROFILE_AAC_MAIN 0
2281 #define FF_PROFILE_AAC_LOW 1
2282 #define FF_PROFILE_AAC_SSR 2
2283 #define FF_PROFILE_AAC_LTP 3
2285 #define FF_PROFILE_DTS 20
2286 #define FF_PROFILE_DTS_ES 30
2287 #define FF_PROFILE_DTS_96_24 40
2288 #define FF_PROFILE_DTS_HD_HRA 50
2289 #define FF_PROFILE_DTS_HD_MA 60
2291 #define FF_PROFILE_MPEG2_422 0
2292 #define FF_PROFILE_MPEG2_HIGH 1
2293 #define FF_PROFILE_MPEG2_SS 2
2294 #define FF_PROFILE_MPEG2_SNR_SCALABLE 3
2295 #define FF_PROFILE_MPEG2_MAIN 4
2296 #define FF_PROFILE_MPEG2_SIMPLE 5
2298 #define FF_PROFILE_H264_CONSTRAINED (1<<9) // 8+1; constraint_set1_flag
2299 #define FF_PROFILE_H264_INTRA (1<<11) // 8+3; constraint_set3_flag
2301 #define FF_PROFILE_H264_BASELINE 66
2302 #define FF_PROFILE_H264_CONSTRAINED_BASELINE (66|FF_PROFILE_H264_CONSTRAINED)
2303 #define FF_PROFILE_H264_MAIN 77
2304 #define FF_PROFILE_H264_EXTENDED 88
2305 #define FF_PROFILE_H264_HIGH 100
2306 #define FF_PROFILE_H264_HIGH_10 110
2307 #define FF_PROFILE_H264_HIGH_10_INTRA (110|FF_PROFILE_H264_INTRA)
2308 #define FF_PROFILE_H264_HIGH_422 122
2309 #define FF_PROFILE_H264_HIGH_422_INTRA (122|FF_PROFILE_H264_INTRA)
2310 #define FF_PROFILE_H264_HIGH_444 144
2311 #define FF_PROFILE_H264_HIGH_444_PREDICTIVE 244
2312 #define FF_PROFILE_H264_HIGH_444_INTRA (244|FF_PROFILE_H264_INTRA)
2313 #define FF_PROFILE_H264_CAVLC_444 44
2315 #define FF_PROFILE_VC1_SIMPLE 0
2316 #define FF_PROFILE_VC1_MAIN 1
2317 #define FF_PROFILE_VC1_COMPLEX 2
2318 #define FF_PROFILE_VC1_ADVANCED 3
2320 #define FF_PROFILE_MPEG4_SIMPLE 0
2321 #define FF_PROFILE_MPEG4_SIMPLE_SCALABLE 1
2322 #define FF_PROFILE_MPEG4_CORE 2
2323 #define FF_PROFILE_MPEG4_MAIN 3
2324 #define FF_PROFILE_MPEG4_N_BIT 4
2325 #define FF_PROFILE_MPEG4_SCALABLE_TEXTURE 5
2326 #define FF_PROFILE_MPEG4_SIMPLE_FACE_ANIMATION 6
2327 #define FF_PROFILE_MPEG4_BASIC_ANIMATED_TEXTURE 7
2328 #define FF_PROFILE_MPEG4_HYBRID 8
2329 #define FF_PROFILE_MPEG4_ADVANCED_REAL_TIME 9
2330 #define FF_PROFILE_MPEG4_CORE_SCALABLE 10
2331 #define FF_PROFILE_MPEG4_ADVANCED_CODING 11
2332 #define FF_PROFILE_MPEG4_ADVANCED_CORE 12
2333 #define FF_PROFILE_MPEG4_ADVANCED_SCALABLE_TEXTURE 13
2334 #define FF_PROFILE_MPEG4_SIMPLE_STUDIO 14
2335 #define FF_PROFILE_MPEG4_ADVANCED_SIMPLE 15
2339 * - encoding: Set by user.
2340 * - decoding: Set by libavcodec.
2343 #define FF_LEVEL_UNKNOWN -99
2346 * low resolution decoding, 1-> 1/2 size, 2->1/4 size
2347 * - encoding: unused
2348 * - decoding: Set by user.
2353 * Bitstream width / height, may be different from width/height if lowres enabled.
2354 * - encoding: unused
2355 * - decoding: Set by user before init if known. Codec should override / dynamically change if needed.
2357 int coded_width, coded_height;
2360 * frame skip threshold
2361 * - encoding: Set by user.
2362 * - decoding: unused
2364 int frame_skip_threshold;
2368 * - encoding: Set by user.
2369 * - decoding: unused
2371 int frame_skip_factor;
2374 * frame skip exponent
2375 * - encoding: Set by user.
2376 * - decoding: unused
2381 * frame skip comparison function
2382 * - encoding: Set by user.
2383 * - decoding: unused
2388 * Border processing masking, raises the quantizer for mbs on the borders
2390 * - encoding: Set by user.
2391 * - decoding: unused
2393 float border_masking;
2396 * minimum MB lagrange multipler
2397 * - encoding: Set by user.
2398 * - decoding: unused
2403 * maximum MB lagrange multipler
2404 * - encoding: Set by user.
2405 * - decoding: unused
2411 * - encoding: Set by user.
2412 * - decoding: unused
2414 int me_penalty_compensation;
2418 * - encoding: unused
2419 * - decoding: Set by user.
2421 enum AVDiscard skip_loop_filter;
2425 * - encoding: unused
2426 * - decoding: Set by user.
2428 enum AVDiscard skip_idct;
2432 * - encoding: unused
2433 * - decoding: Set by user.
2435 enum AVDiscard skip_frame;
2439 * - encoding: Set by user.
2440 * - decoding: unused
2446 * - encoding: Set by user.
2447 * - decoding: unused
2451 #if FF_API_X264_GLOBAL_OPTS
2453 * constant rate factor - quality-based VBR - values ~correspond to qps
2454 * - encoding: Set by user.
2455 * - decoding: unused
2456 * @deprecated use 'crf' libx264 private option
2458 attribute_deprecated float crf;
2461 * constant quantization parameter rate control method
2462 * - encoding: Set by user.
2463 * - decoding: unused
2464 * @deprecated use 'cqp' libx264 private option
2466 attribute_deprecated int cqp;
2471 * - encoding: Set by user.
2472 * - decoding: unused
2477 * number of reference frames
2478 * - encoding: Set by user.
2479 * - decoding: Set by lavc.
2484 * chroma qp offset from luma
2485 * - encoding: Set by user.
2486 * - decoding: unused
2490 #if FF_API_X264_GLOBAL_OPTS
2492 * Influences how often B-frames are used.
2493 * - encoding: Set by user.
2494 * - decoding: unused
2496 attribute_deprecated int bframebias;
2500 * trellis RD quantization
2501 * - encoding: Set by user.
2502 * - decoding: unused
2506 #if FF_API_X264_GLOBAL_OPTS
2508 * Reduce fluctuations in qp (before curve compression).
2509 * - encoding: Set by user.
2510 * - decoding: unused
2512 attribute_deprecated float complexityblur;
2515 * in-loop deblocking filter alphac0 parameter
2516 * alpha is in the range -6...6
2517 * - encoding: Set by user.
2518 * - decoding: unused
2520 attribute_deprecated int deblockalpha;
2523 * in-loop deblocking filter beta parameter
2524 * beta is in the range -6...6
2525 * - encoding: Set by user.
2526 * - decoding: unused
2528 attribute_deprecated int deblockbeta;
2531 * macroblock subpartition sizes to consider - p8x8, p4x4, b8x8, i8x8, i4x4
2532 * - encoding: Set by user.
2533 * - decoding: unused
2535 attribute_deprecated int partitions;
2536 #define X264_PART_I4X4 0x001 /* Analyze i4x4 */
2537 #define X264_PART_I8X8 0x002 /* Analyze i8x8 (requires 8x8 transform) */
2538 #define X264_PART_P8X8 0x010 /* Analyze p16x8, p8x16 and p8x8 */
2539 #define X264_PART_P4X4 0x020 /* Analyze p8x4, p4x8, p4x4 */
2540 #define X264_PART_B8X8 0x100 /* Analyze b16x8, b8x16 and b8x8 */
2543 * direct MV prediction mode - 0 (none), 1 (spatial), 2 (temporal), 3 (auto)
2544 * - encoding: Set by user.
2545 * - decoding: unused
2547 attribute_deprecated int directpred;
2551 * Audio cutoff bandwidth (0 means "automatic")
2552 * - encoding: Set by user.
2553 * - decoding: unused
2558 * Multiplied by qscale for each frame and added to scene_change_score.
2559 * - encoding: Set by user.
2560 * - decoding: unused
2562 int scenechange_factor;
2566 * Note: Value depends upon the compare function used for fullpel ME.
2567 * - encoding: Set by user.
2568 * - decoding: unused
2573 * Adjusts sensitivity of b_frame_strategy 1.
2574 * - encoding: Set by user.
2575 * - decoding: unused
2580 * - encoding: Set by user.
2581 * - decoding: unused
2583 int compression_level;
2584 #define FF_COMPRESSION_DEFAULT -1
2587 * - encoding: Set by user.
2588 * - decoding: unused
2590 int min_prediction_order;
2593 * - encoding: Set by user.
2594 * - decoding: unused
2596 int max_prediction_order;
2598 #if FF_API_FLAC_GLOBAL_OPTS
2600 * @name FLAC options
2601 * @deprecated Use FLAC encoder private options instead.
2606 * LPC coefficient precision - used by FLAC encoder
2607 * - encoding: Set by user.
2608 * - decoding: unused
2610 attribute_deprecated int lpc_coeff_precision;
2613 * search method for selecting prediction order
2614 * - encoding: Set by user.
2615 * - decoding: unused
2617 attribute_deprecated int prediction_order_method;
2620 * - encoding: Set by user.
2621 * - decoding: unused
2623 attribute_deprecated int min_partition_order;
2626 * - encoding: Set by user.
2627 * - decoding: unused
2629 attribute_deprecated int max_partition_order;
2636 * GOP timecode frame start number, in non drop frame format
2637 * - encoding: Set by user.
2638 * - decoding: unused
2640 int64_t timecode_frame_start;
2642 #if FF_API_REQUEST_CHANNELS
2644 * Decoder should decode to this many channels if it can (0 for default)
2645 * - encoding: unused
2646 * - decoding: Set by user.
2647 * @deprecated Deprecated in favor of request_channel_layout.
2649 int request_channels;
2652 #if FF_API_DRC_SCALE
2654 * Percentage of dynamic range compression to be applied by the decoder.
2655 * The default value is 1.0, corresponding to full compression.
2656 * - encoding: unused
2657 * - decoding: Set by user.
2658 * @deprecated use AC3 decoder private option instead.
2660 attribute_deprecated float drc_scale;
2664 * opaque 64bit number (generally a PTS) that will be reordered and
2665 * output in AVFrame.reordered_opaque
2666 * @deprecated in favor of pkt_pts
2667 * - encoding: unused
2668 * - decoding: Set by user.
2670 int64_t reordered_opaque;
2673 * Bits per sample/pixel of internal libavcodec pixel/sample format.
2674 * - encoding: set by user.
2675 * - decoding: set by libavcodec.
2677 int bits_per_raw_sample;
2680 * Audio channel layout.
2681 * - encoding: set by user.
2682 * - decoding: set by user, may be overwritten by libavcodec.
2684 int64_t channel_layout;
2687 * Request decoder to use this channel layout if it can (0 for default)
2688 * - encoding: unused
2689 * - decoding: Set by user.
2691 int64_t request_channel_layout;
2694 * Ratecontrol attempt to use, at maximum, <value> of what can be used without an underflow.
2695 * - encoding: Set by user.
2696 * - decoding: unused.
2698 float rc_max_available_vbv_use;
2701 * Ratecontrol attempt to use, at least, <value> times the amount needed to prevent a vbv overflow.
2702 * - encoding: Set by user.
2703 * - decoding: unused.
2705 float rc_min_vbv_overflow_use;
2708 * Hardware accelerator in use
2709 * - encoding: unused.
2710 * - decoding: Set by libavcodec
2712 struct AVHWAccel *hwaccel;
2715 * For some codecs, the time base is closer to the field rate than the frame rate.
2716 * Most notably, H.264 and MPEG-2 specify time_base as half of frame duration
2717 * if no telecine is used ...
2719 * Set to time_base ticks per frame. Default 1, e.g., H.264/MPEG-2 set it to 2.
2721 int ticks_per_frame;
2724 * Hardware accelerator context.
2725 * For some hardware accelerators, a global context needs to be
2726 * provided by the user. In that case, this holds display-dependent
2727 * data FFmpeg cannot instantiate itself. Please refer to the
2728 * FFmpeg HW accelerator documentation to know how to fill this
2729 * is. e.g. for VA API, this is a struct vaapi_context.
2730 * - encoding: unused
2731 * - decoding: Set by user
2733 void *hwaccel_context;
2736 * Chromaticity coordinates of the source primaries.
2737 * - encoding: Set by user
2738 * - decoding: Set by libavcodec
2740 enum AVColorPrimaries color_primaries;
2743 * Color Transfer Characteristic.
2744 * - encoding: Set by user
2745 * - decoding: Set by libavcodec
2747 enum AVColorTransferCharacteristic color_trc;
2750 * YUV colorspace type.
2751 * - encoding: Set by user
2752 * - decoding: Set by libavcodec
2754 enum AVColorSpace colorspace;
2757 * MPEG vs JPEG YUV range.
2758 * - encoding: Set by user
2759 * - decoding: Set by libavcodec
2761 enum AVColorRange color_range;
2764 * This defines the location of chroma samples.
2765 * - encoding: Set by user
2766 * - decoding: Set by libavcodec
2768 enum AVChromaLocation chroma_sample_location;
2771 * The codec may call this to execute several independent things.
2772 * It will return only after finishing all tasks.
2773 * The user may replace this with some multithreaded implementation,
2774 * the default implementation will execute the parts serially.
2775 * Also see avcodec_thread_init and e.g. the --enable-pthread configure option.
2776 * @param c context passed also to func
2777 * @param count the number of things to execute
2778 * @param arg2 argument passed unchanged to func
2779 * @param ret return values of executed functions, must have space for "count" values. May be NULL.
2780 * @param func function that will be called count times, with jobnr from 0 to count-1.
2781 * threadnr will be in the range 0 to c->thread_count-1 < MAX_THREADS and so that no
2782 * two instances of func executing at the same time will have the same threadnr.
2783 * @return always 0 currently, but code should handle a future improvement where when any call to func
2784 * returns < 0 no further calls to func may be done and < 0 is returned.
2785 * - encoding: Set by libavcodec, user can override.
2786 * - decoding: Set by libavcodec, user can override.
2788 int (*execute2)(struct AVCodecContext *c, int (*func)(struct AVCodecContext *c2, void *arg, int jobnr, int threadnr), void *arg2, int *ret, int count);
2790 #if FF_API_X264_GLOBAL_OPTS
2792 * explicit P-frame weighted prediction analysis method
2794 * 1: fast blind weighting (one reference duplicate with -1 offset)
2795 * 2: smart weighting (full fade detection analysis)
2796 * - encoding: Set by user.
2797 * - decoding: unused
2799 attribute_deprecated int weighted_p_pred;
2804 * 1: Variance AQ (complexity mask)
2805 * 2: Auto-variance AQ (experimental)
2806 * - encoding: Set by user
2807 * - decoding: unused
2809 attribute_deprecated int aq_mode;
2813 * Reduces blocking and blurring in flat and textured areas.
2814 * - encoding: Set by user
2815 * - decoding: unused
2817 attribute_deprecated float aq_strength;
2821 * Strength of psychovisual optimization
2822 * - encoding: Set by user
2823 * - decoding: unused
2825 attribute_deprecated float psy_rd;
2829 * Strength of psychovisual optimization
2830 * - encoding: Set by user
2831 * - decoding: unused
2833 attribute_deprecated float psy_trellis;
2837 * Number of frames for frametype and ratecontrol lookahead
2838 * - encoding: Set by user
2839 * - decoding: unused
2841 attribute_deprecated int rc_lookahead;
2844 * Constant rate factor maximum
2845 * With CRF encoding mode and VBV restrictions enabled, prevents quality from being worse
2846 * than crf_max, even if doing so would violate VBV restrictions.
2847 * - encoding: Set by user.
2848 * - decoding: unused
2850 attribute_deprecated float crf_max;
2853 int log_level_offset;
2855 #if FF_API_FLAC_GLOBAL_OPTS
2857 * Determines which LPC analysis algorithm to use.
2858 * - encoding: Set by user
2859 * - decoding: unused
2861 attribute_deprecated enum AVLPCType lpc_type;
2864 * Number of passes to use for Cholesky factorization during LPC analysis
2865 * - encoding: Set by user
2866 * - decoding: unused
2868 attribute_deprecated int lpc_passes;
2873 * Indicates number of picture subdivisions. Used for parallelized
2875 * - encoding: Set by user
2876 * - decoding: unused
2881 * Header containing style information for text subtitles.
2882 * For SUBTITLE_ASS subtitle type, it should contain the whole ASS
2883 * [Script Info] and [V4+ Styles] section, plus the [Events] line and
2884 * the Format line following. It shouldn't include any Dialogue line.
2885 * - encoding: Set/allocated/freed by user (before avcodec_open())
2886 * - decoding: Set/allocated/freed by libavcodec (by avcodec_open())
2888 uint8_t *subtitle_header;
2889 int subtitle_header_size;
2892 * Current packet as passed into the decoder, to avoid having
2893 * to pass the packet into every function. Currently only valid
2894 * inside lavc and get/release_buffer callbacks.
2895 * - decoding: set by avcodec_decode_*, read by get_buffer() for setting pkt_pts
2896 * - encoding: unused
2901 * Whether this is a copy of the context which had init() called on it.
2902 * This is used by multithreading - shared tables and picture pointers
2903 * should be freed from the original context only.
2904 * - encoding: Set by libavcodec.
2905 * - decoding: Set by libavcodec.
2910 * Which multithreading methods to use.
2911 * Use of FF_THREAD_FRAME will increase decoding delay by one frame per thread,
2912 * so clients which cannot provide future frames should not use it.
2914 * - encoding: Set by user, otherwise the default is used.
2915 * - decoding: Set by user, otherwise the default is used.
2918 #define FF_THREAD_FRAME 1 ///< Decode more than one frame at once
2919 #define FF_THREAD_SLICE 2 ///< Decode more than one part of a single frame at once
2922 * Which multithreading methods are in use by the codec.
2923 * - encoding: Set by libavcodec.
2924 * - decoding: Set by libavcodec.
2926 int active_thread_type;
2929 * Set by the client if its custom get_buffer() callback can be called
2930 * from another thread, which allows faster multithreaded decoding.
2931 * draw_horiz_band() will be called from other threads regardless of this setting.
2932 * Ignored if the default get_buffer() is used.
2933 * - encoding: Set by user.
2934 * - decoding: Set by user.
2936 int thread_safe_callbacks;
2939 * VBV delay coded in the last frame (in periods of a 27 MHz clock).
2940 * Used for compliant TS muxing.
2941 * - encoding: Set by libavcodec.
2942 * - decoding: unused.
2947 * Type of service that the audio stream conveys.
2948 * - encoding: Set by user.
2949 * - decoding: Set by libavcodec.
2951 enum AVAudioServiceType audio_service_type;
2954 * desired sample format
2955 * - encoding: Not used.
2956 * - decoding: Set by user.
2957 * Decoder will decode to this format if it can.
2959 enum AVSampleFormat request_sample_fmt;
2962 * Error recognition; may misdetect some more or less valid parts as errors.
2963 * - encoding: unused
2964 * - decoding: Set by user.
2967 int error_recognition2;
2969 int error_recognition;
2970 #endif /* FF_API_ER */
2971 #define AV_ER_CRCCHECK (1<<0)
2972 #define AV_ER_BITSTREAM (1<<1)
2973 #define AV_ER_AGGRESSIVE (1<<2)
2974 #define AV_ER_EXPLODE (1<<3)
2977 * Current statistics for PTS correction.
2978 * - decoding: maintained and used by libavcodec, not intended to be used by user apps
2979 * - encoding: unused
2981 int64_t pts_correction_num_faulty_pts; /// Number of incorrect PTS values so far
2982 int64_t pts_correction_num_faulty_dts; /// Number of incorrect DTS values so far
2983 int64_t pts_correction_last_pts; /// PTS of the last frame
2984 int64_t pts_correction_last_dts; /// DTS of the last frame
2992 typedef struct AVProfile {
2994 const char *name; ///< short name for the profile
2997 typedef struct AVCodecDefault AVCodecDefault;
3002 typedef struct AVCodec {
3004 * Name of the codec implementation.
3005 * The name is globally unique among encoders and among decoders (but an
3006 * encoder and a decoder can share the same name).
3007 * This is the primary way to find a codec from the user perspective.
3010 enum AVMediaType type;
3013 int (*init)(AVCodecContext *);
3014 int (*encode)(AVCodecContext *, uint8_t *buf, int buf_size, void *data);
3015 int (*close)(AVCodecContext *);
3016 int (*decode)(AVCodecContext *, void *outdata, int *outdata_size, AVPacket *avpkt);
3018 * Codec capabilities.
3022 struct AVCodec *next;
3025 * Will be called when seeking
3027 void (*flush)(AVCodecContext *);
3028 const AVRational *supported_framerates; ///< array of supported framerates, or NULL if any, array is terminated by {0,0}
3029 const enum PixelFormat *pix_fmts; ///< array of supported pixel formats, or NULL if unknown, array is terminated by -1
3031 * Descriptive name for the codec, meant to be more human readable than name.
3032 * You should use the NULL_IF_CONFIG_SMALL() macro to define it.
3034 const char *long_name;
3035 const int *supported_samplerates; ///< array of supported audio samplerates, or NULL if unknown, array is terminated by 0
3036 const enum AVSampleFormat *sample_fmts; ///< array of supported sample formats, or NULL if unknown, array is terminated by -1
3037 const int64_t *channel_layouts; ///< array of support channel layouts, or NULL if unknown. array is terminated by 0
3038 uint8_t max_lowres; ///< maximum value for lowres supported by the decoder
3039 const AVClass *priv_class; ///< AVClass for the private context
3040 const AVProfile *profiles; ///< array of recognized profiles, or NULL if unknown, array is terminated by {FF_PROFILE_UNKNOWN}
3043 * @name Frame-level threading support functions
3047 * If defined, called on thread contexts when they are created.
3048 * If the codec allocates writable tables in init(), re-allocate them here.
3049 * priv_data will be set to a copy of the original.
3051 int (*init_thread_copy)(AVCodecContext *);
3053 * Copy necessary context variables from a previous thread context to the current one.
3054 * If not defined, the next thread will start automatically; otherwise, the codec
3055 * must call ff_thread_finish_setup().
3057 * dst and src will (rarely) point to the same context, in which case memcpy should be skipped.
3059 int (*update_thread_context)(AVCodecContext *dst, const AVCodecContext *src);
3063 * Private codec-specific defaults.
3065 const AVCodecDefault *defaults;
3068 * Initialize codec static data, called from avcodec_register().
3070 void (*init_static_data)(struct AVCodec *codec);
3076 typedef struct AVHWAccel {
3078 * Name of the hardware accelerated codec.
3079 * The name is globally unique among encoders and among decoders (but an
3080 * encoder and a decoder can share the same name).
3085 * Type of codec implemented by the hardware accelerator.
3087 * See AVMEDIA_TYPE_xxx
3089 enum AVMediaType type;
3092 * Codec implemented by the hardware accelerator.
3099 * Supported pixel format.
3101 * Only hardware accelerated formats are supported here.
3103 enum PixelFormat pix_fmt;
3106 * Hardware accelerated codec capabilities.
3107 * see FF_HWACCEL_CODEC_CAP_*
3111 struct AVHWAccel *next;
3114 * Called at the beginning of each frame or field picture.
3116 * Meaningful frame information (codec specific) is guaranteed to
3117 * be parsed at this point. This function is mandatory.
3119 * Note that buf can be NULL along with buf_size set to 0.
3120 * Otherwise, this means the whole frame is available at this point.
3122 * @param avctx the codec context
3123 * @param buf the frame data buffer base
3124 * @param buf_size the size of the frame in bytes
3125 * @return zero if successful, a negative value otherwise
3127 int (*start_frame)(AVCodecContext *avctx, const uint8_t *buf, uint32_t buf_size);
3130 * Callback for each slice.
3132 * Meaningful slice information (codec specific) is guaranteed to
3133 * be parsed at this point. This function is mandatory.
3135 * @param avctx the codec context
3136 * @param buf the slice data buffer base
3137 * @param buf_size the size of the slice in bytes
3138 * @return zero if successful, a negative value otherwise
3140 int (*decode_slice)(AVCodecContext *avctx, const uint8_t *buf, uint32_t buf_size);
3143 * Called at the end of each frame or field picture.
3145 * The whole picture is parsed at this point and can now be sent
3146 * to the hardware accelerator. This function is mandatory.
3148 * @param avctx the codec context
3149 * @return zero if successful, a negative value otherwise
3151 int (*end_frame)(AVCodecContext *avctx);
3154 * Size of HW accelerator private data.
3156 * Private data is allocated with av_mallocz() before
3157 * AVCodecContext.get_buffer() and deallocated after
3158 * AVCodecContext.release_buffer().
3164 * four components are given, that's all.
3165 * the last component is alpha
3167 typedef struct AVPicture {
3169 int linesize[4]; ///< number of bytes per line
3172 #define AVPALETTE_SIZE 1024
3173 #define AVPALETTE_COUNT 256
3174 #if FF_API_PALETTE_CONTROL
3177 * This structure defines a method for communicating palette changes
3178 * between and demuxer and a decoder.
3180 * @deprecated Use AVPacket to send palette changes instead.
3181 * This is totally broken.
3183 typedef struct AVPaletteControl {
3185 /* Demuxer sets this to 1 to indicate the palette has changed;
3186 * decoder resets to 0. */
3187 int palette_changed;
3189 /* 4-byte ARGB palette entries, stored in native byte order; note that
3190 * the individual palette components should be on a 8-bit scale; if
3191 * the palette data comes from an IBM VGA native format, the component
3192 * data is probably 6 bits in size and needs to be scaled. */
3193 unsigned int palette[AVPALETTE_COUNT];
3195 } AVPaletteControl attribute_deprecated;
3198 enum AVSubtitleType {
3201 SUBTITLE_BITMAP, ///< A bitmap, pict will be set
3204 * Plain text, the text field must be set by the decoder and is
3205 * authoritative. ass and pict fields may contain approximations.
3210 * Formatted text, the ass field must be set by the decoder and is
3211 * authoritative. pict and text fields may contain approximations.
3216 typedef struct AVSubtitleRect {
3217 int x; ///< top left corner of pict, undefined when pict is not set
3218 int y; ///< top left corner of pict, undefined when pict is not set
3219 int w; ///< width of pict, undefined when pict is not set
3220 int h; ///< height of pict, undefined when pict is not set
3221 int nb_colors; ///< number of colors in pict, undefined when pict is not set
3224 * data+linesize for the bitmap of this subtitle.
3225 * can be set for text/ass as well once they where rendered
3228 enum AVSubtitleType type;
3230 char *text; ///< 0 terminated plain UTF-8 text
3233 * 0 terminated ASS/SSA compatible event line.
3234 * The pressentation of this is unaffected by the other values in this
3240 typedef struct AVSubtitle {
3241 uint16_t format; /* 0 = graphics */
3242 uint32_t start_display_time; /* relative to packet pts, in ms */
3243 uint32_t end_display_time; /* relative to packet pts, in ms */
3245 AVSubtitleRect **rects;
3246 int64_t pts; ///< Same as packet pts, in AV_TIME_BASE
3249 /* packet functions */
3252 * @deprecated use NULL instead
3254 attribute_deprecated void av_destruct_packet_nofree(AVPacket *pkt);
3257 * Default packet destructor.
3259 void av_destruct_packet(AVPacket *pkt);
3262 * Initialize optional fields of a packet with default values.
3266 void av_init_packet(AVPacket *pkt);
3269 * Allocate the payload of a packet and initialize its fields with
3273 * @param size wanted payload size
3274 * @return 0 if OK, AVERROR_xxx otherwise
3276 int av_new_packet(AVPacket *pkt, int size);
3279 * Reduce packet size, correctly zeroing padding
3282 * @param size new size
3284 void av_shrink_packet(AVPacket *pkt, int size);
3287 * Increase packet size, correctly zeroing padding
3290 * @param grow_by number of bytes by which to increase the size of the packet
3292 int av_grow_packet(AVPacket *pkt, int grow_by);
3295 * @warning This is a hack - the packet memory allocation stuff is broken. The
3296 * packet is allocated if it was not really allocated.
3298 int av_dup_packet(AVPacket *pkt);
3303 * @param pkt packet to free
3305 void av_free_packet(AVPacket *pkt);
3308 * Allocate new information of a packet.
3311 * @param type side information type
3312 * @param size side information size
3313 * @return pointer to fresh allocated data or NULL otherwise
3315 uint8_t* av_packet_new_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
3319 * Get side information from packet.
3322 * @param type desired side information type
3323 * @param size pointer for side information size to store (optional)
3324 * @return pointer to data if present or NULL otherwise
3326 uint8_t* av_packet_get_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
3329 int av_packet_merge_side_data(AVPacket *pkt);
3331 int av_packet_split_side_data(AVPacket *pkt);
3336 struct ReSampleContext;
3337 struct AVResampleContext;
3339 typedef struct ReSampleContext ReSampleContext;
3342 * Initialize audio resampling context.
3344 * @param output_channels number of output channels
3345 * @param input_channels number of input channels
3346 * @param output_rate output sample rate
3347 * @param input_rate input sample rate
3348 * @param sample_fmt_out requested output sample format
3349 * @param sample_fmt_in input sample format
3350 * @param filter_length length of each FIR filter in the filterbank relative to the cutoff frequency
3351 * @param log2_phase_count log2 of the number of entries in the polyphase filterbank
3352 * @param linear if 1 then the used FIR filter will be linearly interpolated
3353 between the 2 closest, if 0 the closest will be used
3354 * @param cutoff cutoff frequency, 1.0 corresponds to half the output sampling rate
3355 * @return allocated ReSampleContext, NULL if error occured
3357 ReSampleContext *av_audio_resample_init(int output_channels, int input_channels,
3358 int output_rate, int input_rate,
3359 enum AVSampleFormat sample_fmt_out,
3360 enum AVSampleFormat sample_fmt_in,
3361 int filter_length, int log2_phase_count,
3362 int linear, double cutoff);
3364 int audio_resample(ReSampleContext *s, short *output, short *input, int nb_samples);
3367 * Free resample context.
3369 * @param s a non-NULL pointer to a resample context previously
3370 * created with av_audio_resample_init()
3372 void audio_resample_close(ReSampleContext *s);
3376 * Initialize an audio resampler.
3377 * Note, if either rate is not an integer then simply scale both rates up so they are.
3378 * @param filter_length length of each FIR filter in the filterbank relative to the cutoff freq
3379 * @param log2_phase_count log2 of the number of entries in the polyphase filterbank
3380 * @param linear If 1 then the used FIR filter will be linearly interpolated
3381 between the 2 closest, if 0 the closest will be used
3382 * @param cutoff cutoff frequency, 1.0 corresponds to half the output sampling rate
3384 struct AVResampleContext *av_resample_init(int out_rate, int in_rate, int filter_length, int log2_phase_count, int linear, double cutoff);
3387 * Resample an array of samples using a previously configured context.
3388 * @param src an array of unconsumed samples
3389 * @param consumed the number of samples of src which have been consumed are returned here
3390 * @param src_size the number of unconsumed samples available
3391 * @param dst_size the amount of space in samples available in dst
3392 * @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.
3393 * @return the number of samples written in dst or -1 if an error occurred
3395 int av_resample(struct AVResampleContext *c, short *dst, short *src, int *consumed, int src_size, int dst_size, int update_ctx);
3399 * Compensate samplerate/timestamp drift. The compensation is done by changing
3400 * the resampler parameters, so no audible clicks or similar distortions occur
3401 * @param compensation_distance distance in output samples over which the compensation should be performed
3402 * @param sample_delta number of output samples which should be output less
3404 * example: av_resample_compensate(c, 10, 500)
3405 * here instead of 510 samples only 500 samples would be output
3407 * note, due to rounding the actual compensation might be slightly different,
3408 * especially if the compensation_distance is large and the in_rate used during init is small
3410 void av_resample_compensate(struct AVResampleContext *c, int sample_delta, int compensation_distance);
3411 void av_resample_close(struct AVResampleContext *c);
3414 * Allocate memory for a picture. Call avpicture_free() to free it.
3416 * @see avpicture_fill()
3418 * @param picture the picture to be filled in
3419 * @param pix_fmt the format of the picture
3420 * @param width the width of the picture
3421 * @param height the height of the picture
3422 * @return zero if successful, a negative value if not
3424 int avpicture_alloc(AVPicture *picture, enum PixelFormat pix_fmt, int width, int height);
3427 * Free a picture previously allocated by avpicture_alloc().
3428 * The data buffer used by the AVPicture is freed, but the AVPicture structure
3431 * @param picture the AVPicture to be freed
3433 void avpicture_free(AVPicture *picture);
3436 * Fill in the AVPicture fields.
3437 * The fields of the given AVPicture are filled in by using the 'ptr' address
3438 * which points to the image data buffer. Depending on the specified picture
3439 * format, one or multiple image data pointers and line sizes will be set.
3440 * If a planar format is specified, several pointers will be set pointing to
3441 * the different picture planes and the line sizes of the different planes
3442 * will be stored in the lines_sizes array.
3443 * Call with ptr == NULL to get the required size for the ptr buffer.
3445 * To allocate the buffer and fill in the AVPicture fields in one call,
3446 * use avpicture_alloc().
3448 * @param picture AVPicture whose fields are to be filled in
3449 * @param ptr Buffer which will contain or contains the actual image data
3450 * @param pix_fmt The format in which the picture data is stored.
3451 * @param width the width of the image in pixels
3452 * @param height the height of the image in pixels
3453 * @return size of the image data in bytes
3455 int avpicture_fill(AVPicture *picture, uint8_t *ptr,
3456 enum PixelFormat pix_fmt, int width, int height);
3459 * Copy pixel data from an AVPicture into a buffer.
3460 * The data is stored compactly, without any gaps for alignment or padding
3461 * which may be applied by avpicture_fill().
3463 * @see avpicture_get_size()
3465 * @param[in] src AVPicture containing image data
3466 * @param[in] pix_fmt The format in which the picture data is stored.
3467 * @param[in] width the width of the image in pixels.
3468 * @param[in] height the height of the image in pixels.
3469 * @param[out] dest A buffer into which picture data will be copied.
3470 * @param[in] dest_size The size of 'dest'.
3471 * @return The number of bytes written to dest, or a negative value (error code) on error.
3473 int avpicture_layout(const AVPicture* src, enum PixelFormat pix_fmt, int width, int height,
3474 unsigned char *dest, int dest_size);
3477 * Calculate the size in bytes that a picture of the given width and height
3478 * would occupy if stored in the given picture format.
3479 * Note that this returns the size of a compact representation as generated
3480 * by avpicture_layout(), which can be smaller than the size required for e.g.
3483 * @param pix_fmt the given picture format
3484 * @param width the width of the image
3485 * @param height the height of the image
3486 * @return Image data size in bytes or -1 on error (e.g. too large dimensions).
3488 int avpicture_get_size(enum PixelFormat pix_fmt, int width, int height);
3489 void avcodec_get_chroma_sub_sample(enum PixelFormat pix_fmt, int *h_shift, int *v_shift);
3492 * Get the name of a codec.
3493 * @return a static string identifying the codec; never NULL
3495 const char *avcodec_get_name(enum CodecID id);
3497 #if FF_API_GET_PIX_FMT_NAME
3499 * Return the short name for a pixel format.
3501 * \see av_get_pix_fmt(), av_get_pix_fmt_string().
3502 * @deprecated Deprecated in favor of av_get_pix_fmt_name().
3504 attribute_deprecated
3505 const char *avcodec_get_pix_fmt_name(enum PixelFormat pix_fmt);
3508 void avcodec_set_dimensions(AVCodecContext *s, int width, int height);
3511 * Return a value representing the fourCC code associated to the
3512 * pixel format pix_fmt, or 0 if no associated fourCC code can be
3515 unsigned int avcodec_pix_fmt_to_codec_tag(enum PixelFormat pix_fmt);
3518 * Put a string representing the codec tag codec_tag in buf.
3520 * @param buf_size size in bytes of buf
3521 * @return the length of the string that would have been generated if
3522 * enough space had been available, excluding the trailing null
3524 size_t av_get_codec_tag_string(char *buf, size_t buf_size, unsigned int codec_tag);
3526 #define FF_LOSS_RESOLUTION 0x0001 /**< loss due to resolution change */
3527 #define FF_LOSS_DEPTH 0x0002 /**< loss due to color depth change */
3528 #define FF_LOSS_COLORSPACE 0x0004 /**< loss due to color space conversion */
3529 #define FF_LOSS_ALPHA 0x0008 /**< loss of alpha bits */
3530 #define FF_LOSS_COLORQUANT 0x0010 /**< loss due to color quantization */
3531 #define FF_LOSS_CHROMA 0x0020 /**< loss of chroma (e.g. RGB to gray conversion) */
3534 * Compute what kind of losses will occur when converting from one specific
3535 * pixel format to another.
3536 * When converting from one pixel format to another, information loss may occur.
3537 * For example, when converting from RGB24 to GRAY, the color information will
3538 * be lost. Similarly, other losses occur when converting from some formats to
3539 * other formats. These losses can involve loss of chroma, but also loss of
3540 * resolution, loss of color depth, loss due to the color space conversion, loss
3541 * of the alpha bits or loss due to color quantization.
3542 * avcodec_get_fix_fmt_loss() informs you about the various types of losses
3543 * which will occur when converting from one pixel format to another.
3545 * @param[in] dst_pix_fmt destination pixel format
3546 * @param[in] src_pix_fmt source pixel format
3547 * @param[in] has_alpha Whether the source pixel format alpha channel is used.
3548 * @return Combination of flags informing you what kind of losses will occur
3549 * (maximum loss for an invalid dst_pix_fmt).
3551 int avcodec_get_pix_fmt_loss(enum PixelFormat dst_pix_fmt, enum PixelFormat src_pix_fmt,
3555 * Find the best pixel format to convert to given a certain source pixel
3556 * format. When converting from one pixel format to another, information loss
3557 * may occur. For example, when converting from RGB24 to GRAY, the color
3558 * information will be lost. Similarly, other losses occur when converting from
3559 * some formats to other formats. avcodec_find_best_pix_fmt() searches which of
3560 * the given pixel formats should be used to suffer the least amount of loss.
3561 * The pixel formats from which it chooses one, are determined by the
3562 * pix_fmt_mask parameter.
3564 * Note, only the first 64 pixel formats will fit in pix_fmt_mask.
3567 * src_pix_fmt = PIX_FMT_YUV420P;
3568 * pix_fmt_mask = (1 << PIX_FMT_YUV422P) | (1 << PIX_FMT_RGB24);
3569 * dst_pix_fmt = avcodec_find_best_pix_fmt(pix_fmt_mask, src_pix_fmt, alpha, &loss);
3572 * @param[in] pix_fmt_mask bitmask determining which pixel format to choose from
3573 * @param[in] src_pix_fmt source pixel format
3574 * @param[in] has_alpha Whether the source pixel format alpha channel is used.
3575 * @param[out] loss_ptr Combination of flags informing you what kind of losses will occur.
3576 * @return The best pixel format to convert to or -1 if none was found.
3578 enum PixelFormat avcodec_find_best_pix_fmt(int64_t pix_fmt_mask, enum PixelFormat src_pix_fmt,
3579 int has_alpha, int *loss_ptr);
3582 * Find the best pixel format to convert to given a certain source pixel
3583 * format and a selection of two destination pixel formats. When converting from
3584 * one pixel format to another, information loss may occur. For example, when converting
3585 * from RGB24 to GRAY, the color information will be lost. Similarly, other losses occur when
3586 * converting from some formats to other formats. avcodec_find_best_pix_fmt2() selects which of
3587 * the given pixel formats should be used to suffer the least amount of loss.
3589 * If one of the destination formats is PIX_FMT_NONE the other pixel format (if valid) will be
3593 * src_pix_fmt = PIX_FMT_YUV420P;
3594 * dst_pix_fmt1= PIX_FMT_RGB24;
3595 * dst_pix_fmt2= PIX_FMT_GRAY8;
3596 * dst_pix_fmt3= PIX_FMT_RGB8;
3597 * loss= FF_LOSS_CHROMA; // don't care about chroma loss, so chroma loss will be ignored.
3598 * dst_pix_fmt = avcodec_find_best_pix_fmt2(dst_pix_fmt1, dst_pix_fmt2, src_pix_fmt, alpha, &loss);
3599 * dst_pix_fmt = avcodec_find_best_pix_fmt2(dst_pix_fmt, dst_pix_fmt3, src_pix_fmt, alpha, &loss);
3602 * @param[in] dst_pix_fmt1 One of the two destination pixel formats to choose from
3603 * @param[in] dst_pix_fmt2 The other of the two destination pixel formats to choose from
3604 * @param[in] src_pix_fmt Source pixel format
3605 * @param[in] has_alpha Whether the source pixel format alpha channel is used.
3606 * @param[in, out] loss_ptr Combination of loss flags. In: selects which of the losses to ignore, i.e.
3607 * NULL or value of zero means we care about all losses. Out: the loss
3608 * that occurs when converting from src to selected dst pixel format.
3609 * @return The best pixel format to convert to or -1 if none was found.
3611 enum PixelFormat avcodec_find_best_pix_fmt2(enum PixelFormat dst_pix_fmt1, enum PixelFormat dst_pix_fmt2,
3612 enum PixelFormat src_pix_fmt, int has_alpha, int *loss_ptr);
3614 #define FF_ALPHA_TRANSP 0x0001 /* image has some totally transparent pixels */
3615 #define FF_ALPHA_SEMI_TRANSP 0x0002 /* image has some transparent pixels */
3618 * Tell if an image really has transparent alpha values.
3619 * @return ored mask of FF_ALPHA_xxx constants
3621 int img_get_alpha_info(const AVPicture *src,
3622 enum PixelFormat pix_fmt, int width, int height);
3624 /* deinterlace a picture */
3625 /* deinterlace - if not supported return -1 */
3626 int avpicture_deinterlace(AVPicture *dst, const AVPicture *src,
3627 enum PixelFormat pix_fmt, int width, int height);
3629 /* external high level API */
3632 * If c is NULL, returns the first registered codec,
3633 * if c is non-NULL, returns the next registered codec after c,
3634 * or NULL if c is the last one.
3636 AVCodec *av_codec_next(AVCodec *c);
3639 * Return the LIBAVCODEC_VERSION_INT constant.
3641 unsigned avcodec_version(void);
3644 * Return the libavcodec build-time configuration.
3646 const char *avcodec_configuration(void);
3649 * Return the libavcodec license.
3651 const char *avcodec_license(void);
3653 #if FF_API_AVCODEC_INIT
3655 * @deprecated this function is called automatically from avcodec_register()
3656 * and avcodec_register_all(), there is no need to call it manually
3658 attribute_deprecated
3659 void avcodec_init(void);
3663 * Register the codec codec and initialize libavcodec.
3665 * @warning either this function or avcodec_register_all() must be called
3666 * before any other libavcodec functions.
3668 * @see avcodec_register_all()
3670 void avcodec_register(AVCodec *codec);
3673 * Find a registered encoder with a matching codec ID.
3675 * @param id CodecID of the requested encoder
3676 * @return An encoder if one was found, NULL otherwise.
3678 AVCodec *avcodec_find_encoder(enum CodecID id);
3681 * Find a registered encoder with the specified name.
3683 * @param name name of the requested encoder
3684 * @return An encoder if one was found, NULL otherwise.
3686 AVCodec *avcodec_find_encoder_by_name(const char *name);
3689 * Find a registered decoder with a matching codec ID.
3691 * @param id CodecID of the requested decoder
3692 * @return A decoder if one was found, NULL otherwise.
3694 AVCodec *avcodec_find_decoder(enum CodecID id);
3697 * Find a registered decoder with the specified name.
3699 * @param name name of the requested decoder
3700 * @return A decoder if one was found, NULL otherwise.
3702 AVCodec *avcodec_find_decoder_by_name(const char *name);
3703 void avcodec_string(char *buf, int buf_size, AVCodecContext *enc, int encode);
3706 * Return a name for the specified profile, if available.
3708 * @param codec the codec that is searched for the given profile
3709 * @param profile the profile value for which a name is requested
3710 * @return A name for the profile if found, NULL otherwise.
3712 const char *av_get_profile_name(const AVCodec *codec, int profile);
3715 * Set the fields of the given AVCodecContext to default values.
3717 * @param s The AVCodecContext of which the fields should be set to default values.
3719 void avcodec_get_context_defaults(AVCodecContext *s);
3721 /** THIS FUNCTION IS NOT YET PART OF THE PUBLIC API!
3722 * we WILL change its arguments and name a few times! */
3723 void avcodec_get_context_defaults2(AVCodecContext *s, enum AVMediaType);
3725 /** THIS FUNCTION IS NOT YET PART OF THE PUBLIC API!
3726 * we WILL change its arguments and name a few times! */
3727 int avcodec_get_context_defaults3(AVCodecContext *s, AVCodec *codec);
3729 #if FF_API_ALLOC_CONTEXT
3731 * Allocate an AVCodecContext and set its fields to default values. The
3732 * resulting struct can be deallocated by simply calling av_free().
3734 * @return An AVCodecContext filled with default values or NULL on failure.
3735 * @see avcodec_get_context_defaults
3737 * @deprecated use avcodec_alloc_context3()
3739 attribute_deprecated
3740 AVCodecContext *avcodec_alloc_context(void);
3742 /** THIS FUNCTION IS NOT YET PART OF THE PUBLIC API!
3743 * we WILL change its arguments and name a few times! */
3744 attribute_deprecated
3745 AVCodecContext *avcodec_alloc_context2(enum AVMediaType);
3749 * Allocate an AVCodecContext and set its fields to default values. The
3750 * resulting struct can be deallocated by simply calling av_free().
3752 * @param codec if non-NULL, allocate private data and initialize defaults
3753 * for the given codec. It is illegal to then call avcodec_open()
3754 * with a different codec.
3756 * @return An AVCodecContext filled with default values or NULL on failure.
3757 * @see avcodec_get_context_defaults
3759 * @deprecated use avcodec_alloc_context3()
3761 AVCodecContext *avcodec_alloc_context3(AVCodec *codec);
3764 * Copy the settings of the source AVCodecContext into the destination
3765 * AVCodecContext. The resulting destination codec context will be
3766 * unopened, i.e. you are required to call avcodec_open() before you
3767 * can use this AVCodecContext to decode/encode video/audio data.
3769 * @param dest target codec context, should be initialized with
3770 * avcodec_alloc_context3(), but otherwise uninitialized
3771 * @param src source codec context
3772 * @return AVERROR() on error (e.g. memory allocation error), 0 on success
3774 int avcodec_copy_context(AVCodecContext *dest, const AVCodecContext *src);
3777 * Set the fields of the given AVFrame to default values.
3779 * @param pic The AVFrame of which the fields should be set to default values.
3781 void avcodec_get_frame_defaults(AVFrame *pic);
3784 * Allocate an AVFrame and set its fields to default values. The resulting
3785 * struct can be deallocated by simply calling av_free().
3787 * @return An AVFrame filled with default values or NULL on failure.
3788 * @see avcodec_get_frame_defaults
3790 AVFrame *avcodec_alloc_frame(void);
3792 int avcodec_default_get_buffer(AVCodecContext *s, AVFrame *pic);
3793 void avcodec_default_release_buffer(AVCodecContext *s, AVFrame *pic);
3794 int avcodec_default_reget_buffer(AVCodecContext *s, AVFrame *pic);
3797 * Return the amount of padding in pixels which the get_buffer callback must
3798 * provide around the edge of the image for codecs which do not have the
3799 * CODEC_FLAG_EMU_EDGE flag.
3801 * @return Required padding in pixels.
3803 unsigned avcodec_get_edge_width(void);
3805 * Modify width and height values so that they will result in a memory
3806 * buffer that is acceptable for the codec if you do not use any horizontal
3809 * May only be used if a codec with CODEC_CAP_DR1 has been opened.
3810 * If CODEC_FLAG_EMU_EDGE is not set, the dimensions must have been increased
3811 * according to avcodec_get_edge_width() before.
3813 void avcodec_align_dimensions(AVCodecContext *s, int *width, int *height);
3815 * Modify width and height values so that they will result in a memory
3816 * buffer that is acceptable for the codec if you also ensure that all
3817 * line sizes are a multiple of the respective linesize_align[i].
3819 * May only be used if a codec with CODEC_CAP_DR1 has been opened.
3820 * If CODEC_FLAG_EMU_EDGE is not set, the dimensions must have been increased
3821 * according to avcodec_get_edge_width() before.
3823 void avcodec_align_dimensions2(AVCodecContext *s, int *width, int *height,
3824 int linesize_align[4]);
3826 enum PixelFormat avcodec_default_get_format(struct AVCodecContext *s, const enum PixelFormat * fmt);
3828 #if FF_API_THREAD_INIT
3830 * @deprecated Set s->thread_count before calling avcodec_open() instead of calling this.
3832 attribute_deprecated
3833 int avcodec_thread_init(AVCodecContext *s, int thread_count);
3836 int avcodec_default_execute(AVCodecContext *c, int (*func)(AVCodecContext *c2, void *arg2),void *arg, int *ret, int count, int size);
3837 int avcodec_default_execute2(AVCodecContext *c, int (*func)(AVCodecContext *c2, void *arg2, int, int),void *arg, int *ret, int count);
3838 //FIXME func typedef
3840 #if FF_API_AVCODEC_OPEN
3842 * Initialize the AVCodecContext to use the given AVCodec. Prior to using this
3843 * function the context has to be allocated.
3845 * The functions avcodec_find_decoder_by_name(), avcodec_find_encoder_by_name(),
3846 * avcodec_find_decoder() and avcodec_find_encoder() provide an easy way for
3847 * retrieving a codec.
3849 * @warning This function is not thread safe!
3852 * avcodec_register_all();
3853 * codec = avcodec_find_decoder(CODEC_ID_H264);
3857 * context = avcodec_alloc_context3(codec);
3859 * if (avcodec_open(context, codec) < 0)
3863 * @param avctx The context which will be set up to use the given codec.
3864 * @param codec The codec to use within the context.
3865 * @return zero on success, a negative value on error
3866 * @see avcodec_alloc_context3, avcodec_find_decoder, avcodec_find_encoder, avcodec_close
3868 * @deprecated use avcodec_open2
3870 attribute_deprecated
3871 int avcodec_open(AVCodecContext *avctx, AVCodec *codec);
3875 * Initialize the AVCodecContext to use the given AVCodec. Prior to using this
3876 * function the context has to be allocated with avcodec_alloc_context().
3878 * The functions avcodec_find_decoder_by_name(), avcodec_find_encoder_by_name(),
3879 * avcodec_find_decoder() and avcodec_find_encoder() provide an easy way for
3880 * retrieving a codec.
3882 * @warning This function is not thread safe!
3885 * avcodec_register_all();
3886 * av_dict_set(&opts, "b", "2.5M", 0);
3887 * codec = avcodec_find_decoder(CODEC_ID_H264);
3891 * context = avcodec_alloc_context();
3893 * if (avcodec_open(context, codec, opts) < 0)
3897 * @param avctx The context to initialize.
3898 * @param options A dictionary filled with AVCodecContext and codec-private options.
3899 * On return this object will be filled with options that were not found.
3901 * @return zero on success, a negative value on error
3902 * @see avcodec_alloc_context3(), avcodec_find_decoder(), avcodec_find_encoder(),
3903 * av_dict_set(), av_opt_find().
3905 int avcodec_open2(AVCodecContext *avctx, AVCodec *codec, AVDictionary **options);
3908 * Decode the audio frame of size avpkt->size from avpkt->data into samples.
3909 * Some decoders may support multiple frames in a single AVPacket, such
3910 * decoders would then just decode the first frame. In this case,
3911 * avcodec_decode_audio3 has to be called again with an AVPacket that contains
3912 * the remaining data in order to decode the second frame etc.
3914 * could be outputted, frame_size_ptr is zero. Otherwise, it is the
3915 * decompressed frame size in bytes.
3917 * @warning You must set frame_size_ptr to the allocated size of the
3918 * output buffer before calling avcodec_decode_audio3().
3920 * @warning The input buffer must be FF_INPUT_BUFFER_PADDING_SIZE larger than
3921 * the actual read bytes because some optimized bitstream readers read 32 or 64
3922 * bits at once and could read over the end.
3924 * @warning The end of the input buffer avpkt->data should be set to 0 to ensure that
3925 * no overreading happens for damaged MPEG streams.
3927 * @note You might have to align the input buffer avpkt->data and output buffer
3928 * samples. The alignment requirements depend on the CPU: On some CPUs it isn't
3929 * necessary at all, on others it won't work at all if not aligned and on others
3930 * it will work but it will have an impact on performance.
3932 * In practice, avpkt->data should have 4 byte alignment at minimum and
3933 * samples should be 16 byte aligned unless the CPU doesn't need it
3934 * (AltiVec and SSE do).
3936 * @param avctx the codec context
3937 * @param[out] samples the output buffer, sample type in avctx->sample_fmt
3938 * @param[in,out] frame_size_ptr the output buffer size in bytes
3939 * @param[in] avpkt The input AVPacket containing the input buffer.
3940 * You can create such packet with av_init_packet() and by then setting
3941 * data and size, some decoders might in addition need other fields.
3942 * All decoders are designed to use the least fields possible though.
3943 * @return On error a negative value is returned, otherwise the number of bytes
3944 * used or zero if no frame data was decompressed (used) from the input AVPacket.
3946 int avcodec_decode_audio3(AVCodecContext *avctx, int16_t *samples,
3947 int *frame_size_ptr,
3951 * Decode the video frame of size avpkt->size from avpkt->data into picture.
3952 * Some decoders may support multiple frames in a single AVPacket, such
3953 * decoders would then just decode the first frame.
3955 * @warning The input buffer must be FF_INPUT_BUFFER_PADDING_SIZE larger than
3956 * the actual read bytes because some optimized bitstream readers read 32 or 64
3957 * bits at once and could read over the end.
3959 * @warning The end of the input buffer buf should be set to 0 to ensure that
3960 * no overreading happens for damaged MPEG streams.
3962 * @note You might have to align the input buffer avpkt->data.
3963 * The alignment requirements depend on the CPU: on some CPUs it isn't
3964 * necessary at all, on others it won't work at all if not aligned and on others
3965 * it will work but it will have an impact on performance.
3967 * In practice, avpkt->data should have 4 byte alignment at minimum.
3969 * @note Some codecs have a delay between input and output, these need to be
3970 * fed with avpkt->data=NULL, avpkt->size=0 at the end to return the remaining frames.
3972 * @param avctx the codec context
3973 * @param[out] picture The AVFrame in which the decoded video frame will be stored.
3974 * Use avcodec_alloc_frame to get an AVFrame, the codec will
3975 * allocate memory for the actual bitmap.
3976 * with default get/release_buffer(), the decoder frees/reuses the bitmap as it sees fit.
3977 * with overridden get/release_buffer() (needs CODEC_CAP_DR1) the user decides into what buffer the decoder
3978 * decodes and the decoder tells the user once it does not need the data anymore,
3979 * the user app can at this point free/reuse/keep the memory as it sees fit.
3981 * @param[in] avpkt The input AVpacket containing the input buffer.
3982 * You can create such packet with av_init_packet() and by then setting
3983 * data and size, some decoders might in addition need other fields like
3984 * flags&AV_PKT_FLAG_KEY. All decoders are designed to use the least
3986 * @param[in,out] got_picture_ptr Zero if no frame could be decompressed, otherwise, it is nonzero.
3987 * @return On error a negative value is returned, otherwise the number of bytes
3988 * used or zero if no frame could be decompressed.
3990 int avcodec_decode_video2(AVCodecContext *avctx, AVFrame *picture,
3991 int *got_picture_ptr,
3995 * Decode a subtitle message.
3996 * Return a negative value on error, otherwise return the number of bytes used.
3997 * If no subtitle could be decompressed, got_sub_ptr is zero.
3998 * Otherwise, the subtitle is stored in *sub.
3999 * Note that CODEC_CAP_DR1 is not available for subtitle codecs. This is for
4000 * simplicity, because the performance difference is expect to be negligible
4001 * and reusing a get_buffer written for video codecs would probably perform badly
4002 * due to a potentially very different allocation pattern.
4004 * @param avctx the codec context
4005 * @param[out] sub The AVSubtitle in which the decoded subtitle will be stored, must be
4006 freed with avsubtitle_free if *got_sub_ptr is set.
4007 * @param[in,out] got_sub_ptr Zero if no subtitle could be decompressed, otherwise, it is nonzero.
4008 * @param[in] avpkt The input AVPacket containing the input buffer.
4010 int avcodec_decode_subtitle2(AVCodecContext *avctx, AVSubtitle *sub,
4015 * Frees all allocated data in the given subtitle struct.
4017 * @param sub AVSubtitle to free.
4019 void avsubtitle_free(AVSubtitle *sub);
4021 int avcodec_parse_frame(AVCodecContext *avctx, uint8_t **pdata,
4023 uint8_t *buf, int buf_size);
4026 * Encode an audio frame from samples into buf.
4028 * @note The output buffer should be at least FF_MIN_BUFFER_SIZE bytes large.
4029 * However, for PCM audio the user will know how much space is needed
4030 * because it depends on the value passed in buf_size as described
4031 * below. In that case a lower value can be used.
4033 * @param avctx the codec context
4034 * @param[out] buf the output buffer
4035 * @param[in] buf_size the output buffer size
4036 * @param[in] samples the input buffer containing the samples
4037 * The number of samples read from this buffer is frame_size*channels,
4038 * both of which are defined in avctx.
4039 * For PCM audio the number of samples read from samples is equal to
4040 * buf_size * input_sample_size / output_sample_size.
4041 * @return On error a negative value is returned, on success zero or the number
4042 * of bytes used to encode the data read from the input buffer.
4044 int avcodec_encode_audio(AVCodecContext *avctx, uint8_t *buf, int buf_size,
4045 const short *samples);
4048 * Encode a video frame from pict into buf.
4049 * The input picture should be
4050 * stored using a specific format, namely avctx.pix_fmt.
4052 * @param avctx the codec context
4053 * @param[out] buf the output buffer for the bitstream of encoded frame
4054 * @param[in] buf_size the size of the output buffer in bytes
4055 * @param[in] pict the input picture to encode
4056 * @return On error a negative value is returned, on success zero or the number
4057 * of bytes used from the output buffer.
4059 int avcodec_encode_video(AVCodecContext *avctx, uint8_t *buf, int buf_size,
4060 const AVFrame *pict);
4061 int avcodec_encode_subtitle(AVCodecContext *avctx, uint8_t *buf, int buf_size,
4062 const AVSubtitle *sub);
4064 int avcodec_close(AVCodecContext *avctx);
4067 * Register all the codecs, parsers and bitstream filters which were enabled at
4068 * configuration time. If you do not call this function you can select exactly
4069 * which formats you want to support, by using the individual registration
4072 * @see avcodec_register
4073 * @see av_register_codec_parser
4074 * @see av_register_bitstream_filter
4076 void avcodec_register_all(void);
4079 * Flush buffers, should be called when seeking or when switching to a different stream.
4081 void avcodec_flush_buffers(AVCodecContext *avctx);
4083 void avcodec_default_free_buffers(AVCodecContext *s);
4085 /* misc useful functions */
4087 #if FF_API_OLD_FF_PICT_TYPES
4089 * Return a single letter to describe the given picture type pict_type.
4091 * @param[in] pict_type the picture type
4092 * @return A single character representing the picture type.
4093 * @deprecated Use av_get_picture_type_char() instead.
4095 attribute_deprecated
4096 char av_get_pict_type_char(int pict_type);
4100 * Return codec bits per sample.
4102 * @param[in] codec_id the codec
4103 * @return Number of bits per sample or zero if unknown for the given codec.
4105 int av_get_bits_per_sample(enum CodecID codec_id);
4107 #if FF_API_OLD_SAMPLE_FMT
4109 * @deprecated Use av_get_bytes_per_sample() instead.
4111 attribute_deprecated
4112 int av_get_bits_per_sample_format(enum AVSampleFormat sample_fmt);
4116 typedef struct AVCodecParserContext {
4118 struct AVCodecParser *parser;
4119 int64_t frame_offset; /* offset of the current frame */
4120 int64_t cur_offset; /* current offset
4121 (incremented by each av_parser_parse()) */
4122 int64_t next_frame_offset; /* offset of the next frame */
4124 int pict_type; /* XXX: Put it back in AVCodecContext. */
4126 * This field is used for proper frame duration computation in lavf.
4127 * It signals, how much longer the frame duration of the current frame
4128 * is compared to normal frame duration.
4130 * frame_duration = (1 + repeat_pict) * time_base
4132 * It is used by codecs like H.264 to display telecined material.
4134 int repeat_pict; /* XXX: Put it back in AVCodecContext. */
4135 int64_t pts; /* pts of the current frame */
4136 int64_t dts; /* dts of the current frame */
4141 int fetch_timestamp;
4143 #define AV_PARSER_PTS_NB 4
4144 int cur_frame_start_index;
4145 int64_t cur_frame_offset[AV_PARSER_PTS_NB];
4146 int64_t cur_frame_pts[AV_PARSER_PTS_NB];
4147 int64_t cur_frame_dts[AV_PARSER_PTS_NB];
4150 #define PARSER_FLAG_COMPLETE_FRAMES 0x0001
4151 #define PARSER_FLAG_ONCE 0x0002
4152 /// Set if the parser has a valid file offset
4153 #define PARSER_FLAG_FETCHED_OFFSET 0x0004
4155 int64_t offset; ///< byte offset from starting packet start
4156 int64_t cur_frame_end[AV_PARSER_PTS_NB];
4159 * Set by parser to 1 for key frames and 0 for non-key frames.
4160 * It is initialized to -1, so if the parser doesn't set this flag,
4161 * old-style fallback using AV_PICTURE_TYPE_I picture type as key frames
4167 * Time difference in stream time base units from the pts of this
4168 * packet to the point at which the output from the decoder has converged
4169 * independent from the availability of previous frames. That is, the
4170 * frames are virtually identical no matter if decoding started from
4171 * the very first frame or from this keyframe.
4172 * Is AV_NOPTS_VALUE if unknown.
4173 * This field is not the display duration of the current frame.
4174 * This field has no meaning if the packet does not have AV_PKT_FLAG_KEY
4177 * The purpose of this field is to allow seeking in streams that have no
4178 * keyframes in the conventional sense. It corresponds to the
4179 * recovery point SEI in H.264 and match_time_delta in NUT. It is also
4180 * essential for some types of subtitle streams to ensure that all
4181 * subtitles are correctly displayed after seeking.
4183 int64_t convergence_duration;
4185 // Timestamp generation support:
4187 * Synchronization point for start of timestamp generation.
4189 * Set to >0 for sync point, 0 for no sync point and <0 for undefined
4192 * For example, this corresponds to presence of H.264 buffering period
4198 * Offset of the current timestamp against last timestamp sync point in
4199 * units of AVCodecContext.time_base.
4201 * Set to INT_MIN when dts_sync_point unused. Otherwise, it must
4202 * contain a valid timestamp offset.
4204 * Note that the timestamp of sync point has usually a nonzero
4205 * dts_ref_dts_delta, which refers to the previous sync point. Offset of
4206 * the next frame after timestamp sync point will be usually 1.
4208 * For example, this corresponds to H.264 cpb_removal_delay.
4210 int dts_ref_dts_delta;
4213 * Presentation delay of current frame in units of AVCodecContext.time_base.
4215 * Set to INT_MIN when dts_sync_point unused. Otherwise, it must
4216 * contain valid non-negative timestamp delta (presentation time of a frame
4217 * must not lie in the past).
4219 * This delay represents the difference between decoding and presentation
4220 * time of the frame.
4222 * For example, this corresponds to H.264 dpb_output_delay.
4227 * Position of the packet in file.
4229 * Analogous to cur_frame_pts/dts
4231 int64_t cur_frame_pos[AV_PARSER_PTS_NB];
4234 * Byte position of currently parsed frame in stream.
4239 * Previous frame byte position.
4242 } AVCodecParserContext;
4244 typedef struct AVCodecParser {
4245 int codec_ids[5]; /* several codec IDs are permitted */
4247 int (*parser_init)(AVCodecParserContext *s);
4248 int (*parser_parse)(AVCodecParserContext *s,
4249 AVCodecContext *avctx,
4250 const uint8_t **poutbuf, int *poutbuf_size,
4251 const uint8_t *buf, int buf_size);
4252 void (*parser_close)(AVCodecParserContext *s);
4253 int (*split)(AVCodecContext *avctx, const uint8_t *buf, int buf_size);
4254 struct AVCodecParser *next;
4257 AVCodecParser *av_parser_next(AVCodecParser *c);
4259 void av_register_codec_parser(AVCodecParser *parser);
4260 AVCodecParserContext *av_parser_init(int codec_id);
4265 * @param s parser context.
4266 * @param avctx codec context.
4267 * @param poutbuf set to pointer to parsed buffer or NULL if not yet finished.
4268 * @param poutbuf_size set to size of parsed buffer or zero if not yet finished.
4269 * @param buf input buffer.
4270 * @param buf_size input length, to signal EOF, this should be 0 (so that the last frame can be output).
4271 * @param pts input presentation timestamp.
4272 * @param dts input decoding timestamp.
4273 * @param pos input byte position in stream.
4274 * @return the number of bytes of the input bitstream used.
4279 * len = av_parser_parse2(myparser, AVCodecContext, &data, &size,
4286 * decode_frame(data, size);
4290 int av_parser_parse2(AVCodecParserContext *s,
4291 AVCodecContext *avctx,
4292 uint8_t **poutbuf, int *poutbuf_size,
4293 const uint8_t *buf, int buf_size,
4294 int64_t pts, int64_t dts,
4297 int av_parser_change(AVCodecParserContext *s,
4298 AVCodecContext *avctx,
4299 uint8_t **poutbuf, int *poutbuf_size,
4300 const uint8_t *buf, int buf_size, int keyframe);
4301 void av_parser_close(AVCodecParserContext *s);
4304 typedef struct AVBitStreamFilterContext {
4306 struct AVBitStreamFilter *filter;
4307 AVCodecParserContext *parser;
4308 struct AVBitStreamFilterContext *next;
4309 } AVBitStreamFilterContext;
4312 typedef struct AVBitStreamFilter {
4315 int (*filter)(AVBitStreamFilterContext *bsfc,
4316 AVCodecContext *avctx, const char *args,
4317 uint8_t **poutbuf, int *poutbuf_size,
4318 const uint8_t *buf, int buf_size, int keyframe);
4319 void (*close)(AVBitStreamFilterContext *bsfc);
4320 struct AVBitStreamFilter *next;
4321 } AVBitStreamFilter;
4323 void av_register_bitstream_filter(AVBitStreamFilter *bsf);
4324 AVBitStreamFilterContext *av_bitstream_filter_init(const char *name);
4325 int av_bitstream_filter_filter(AVBitStreamFilterContext *bsfc,
4326 AVCodecContext *avctx, const char *args,
4327 uint8_t **poutbuf, int *poutbuf_size,
4328 const uint8_t *buf, int buf_size, int keyframe);
4329 void av_bitstream_filter_close(AVBitStreamFilterContext *bsf);
4331 AVBitStreamFilter *av_bitstream_filter_next(AVBitStreamFilter *f);
4336 * Reallocate the given block if it is not large enough, otherwise do nothing.
4340 void *av_fast_realloc(void *ptr, unsigned int *size, size_t min_size);
4343 * Allocate a buffer, reusing the given one if large enough.
4345 * Contrary to av_fast_realloc the current buffer contents might not be
4346 * preserved and on error the old buffer is freed, thus no special
4347 * handling to avoid memleaks is necessary.
4349 * @param ptr pointer to pointer to already allocated buffer, overwritten with pointer to new buffer
4350 * @param size size of the buffer *ptr points to
4351 * @param min_size minimum size of *ptr buffer after returning, *ptr will be NULL and
4352 * *size 0 if an error occurred.
4354 void av_fast_malloc(void *ptr, unsigned int *size, size_t min_size);
4357 * Copy image src to dst. Wraps av_picture_data_copy() above.
4359 void av_picture_copy(AVPicture *dst, const AVPicture *src,
4360 enum PixelFormat pix_fmt, int width, int height);
4363 * Crop image top and left side.
4365 int av_picture_crop(AVPicture *dst, const AVPicture *src,
4366 enum PixelFormat pix_fmt, int top_band, int left_band);
4371 int av_picture_pad(AVPicture *dst, const AVPicture *src, int height, int width, enum PixelFormat pix_fmt,
4372 int padtop, int padbottom, int padleft, int padright, int *color);
4375 * Encode extradata length to a buffer. Used by xiph codecs.
4377 * @param s buffer to write to; must be at least (v/255+1) bytes long
4378 * @param v size of extradata in bytes
4379 * @return number of bytes written to the buffer.
4381 unsigned int av_xiphlacing(unsigned char *s, unsigned int v);
4384 * Logs a generic warning message about a missing feature. This function is
4385 * intended to be used internally by FFmpeg (libavcodec, libavformat, etc.)
4386 * only, and would normally not be used by applications.
4387 * @param[in] avc a pointer to an arbitrary struct of which the first field is
4388 * a pointer to an AVClass struct
4389 * @param[in] feature string containing the name of the missing feature
4390 * @param[in] want_sample indicates if samples are wanted which exhibit this feature.
4391 * If want_sample is non-zero, additional verbage will be added to the log
4392 * message which tells the user how to report samples to the development
4395 void av_log_missing_feature(void *avc, const char *feature, int want_sample);
4398 * Log a generic warning message asking for a sample. This function is
4399 * intended to be used internally by FFmpeg (libavcodec, libavformat, etc.)
4400 * only, and would normally not be used by applications.
4401 * @param[in] avc a pointer to an arbitrary struct of which the first field is
4402 * a pointer to an AVClass struct
4403 * @param[in] msg string containing an optional message, or NULL if no message
4405 void av_log_ask_for_sample(void *avc, const char *msg, ...) av_printf_format(2, 3);
4408 * Register the hardware accelerator hwaccel.
4410 void av_register_hwaccel(AVHWAccel *hwaccel);
4413 * If hwaccel is NULL, returns the first registered hardware accelerator,
4414 * if hwaccel is non-NULL, returns the next registered hardware accelerator
4415 * after hwaccel, or NULL if hwaccel is the last one.
4417 AVHWAccel *av_hwaccel_next(AVHWAccel *hwaccel);
4421 * Lock operation used by lockmgr
4424 AV_LOCK_CREATE, ///< Create a mutex
4425 AV_LOCK_OBTAIN, ///< Lock the mutex
4426 AV_LOCK_RELEASE, ///< Unlock the mutex
4427 AV_LOCK_DESTROY, ///< Free mutex resources
4431 * Register a user provided lock manager supporting the operations
4432 * specified by AVLockOp. mutex points to a (void *) where the
4433 * lockmgr should store/get a pointer to a user allocated mutex. It's
4434 * NULL upon AV_LOCK_CREATE and != NULL for all other ops.
4436 * @param cb User defined callback. Note: FFmpeg may invoke calls to this
4437 * callback during the call to av_lockmgr_register().
4438 * Thus, the application must be prepared to handle that.
4439 * If cb is set to NULL the lockmgr will be unregistered.
4440 * Also note that during unregistration the previously registered
4441 * lockmgr callback may also be invoked.
4443 int av_lockmgr_register(int (*cb)(void **mutex, enum AVLockOp op));
4446 * Get the type of the given codec.
4448 enum AVMediaType avcodec_get_type(enum CodecID codec_id);
4451 * Get the AVClass for AVCodecContext. It can be used in combination with
4452 * AV_OPT_SEARCH_FAKE_OBJ for examining options.
4454 * @see av_opt_find().
4456 const AVClass *avcodec_get_class(void);
4458 #endif /* AVCODEC_AVCODEC_H */