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"
40 * @defgroup libavc Encoding/Decoding Library
43 * @defgroup lavc_decoding Decoding
47 * @defgroup lavc_encoding Encoding
51 * @defgroup lavc_codec Codecs
53 * @defgroup lavc_codec_native Native Codecs
56 * @defgroup lavc_codec_wrappers External library wrappers
59 * @defgroup lavc_codec_hwaccel Hardware Accelerators bridge
63 * @defgroup lavc_internal Internal
72 * Identify the syntax and semantics of the bitstream.
73 * The principle is roughly:
74 * Two decoders with the same ID can decode the same streams.
75 * Two encoders with the same ID can encode compatible streams.
76 * There may be slight deviations from the principle due to implementation
79 * If you add a codec ID to this list, add it so that
80 * 1. no value of a existing codec ID changes (that would break ABI),
81 * 2. Give it a value which when taken as ASCII is recognized uniquely by a human as this specific codec.
82 * This ensures that 2 forks can independantly add CodecIDs without producing conflicts.
89 CODEC_ID_MPEG2VIDEO, ///< preferred ID for MPEG-1/2 video decoding
90 CODEC_ID_MPEG2VIDEO_XVMC,
127 CODEC_ID_INTERPLAY_VIDEO,
139 CODEC_ID_TRUEMOTION1,
166 CODEC_ID_TRUEMOTION2,
183 CODEC_ID_DSICINVIDEO,
184 CODEC_ID_TIERTEXSEQVIDEO,
187 #if LIBAVCODEC_VERSION_MAJOR == 53
195 CODEC_ID_BETHSOFTVID,
207 #if LIBAVCODEC_VERSION_MAJOR == 53
215 CODEC_ID_MOTIONPIXELS,
233 CODEC_ID_IFF_BYTERUN1,
249 #if LIBAVCODEC_VERSION_MAJOR == 53
250 CODEC_ID_G723_1_DEPRECATED,
251 CODEC_ID_G729_DEPRECATED,
253 CODEC_ID_UTVIDEO_DEPRECATED,
258 CODEC_ID_Y41P = MKBETAG('Y','4','1','P'),
259 CODEC_ID_UTVIDEO = 0x800,
260 CODEC_ID_ESCAPE130 = MKBETAG('E','1','3','0'),
262 CODEC_ID_G2M = MKBETAG( 0 ,'G','2','M'),
264 /* various PCM "codecs" */
265 CODEC_ID_FIRST_AUDIO = 0x10000, ///< A dummy id pointing at the start of audio codecs
266 CODEC_ID_PCM_S16LE = 0x10000,
282 CODEC_ID_PCM_S24DAUD,
284 CODEC_ID_PCM_S16LE_PLANAR,
293 CODEC_ID_PCM_S8_PLANAR,
295 /* various ADPCM codecs */
296 CODEC_ID_ADPCM_IMA_QT = 0x11000,
297 CODEC_ID_ADPCM_IMA_WAV,
298 CODEC_ID_ADPCM_IMA_DK3,
299 CODEC_ID_ADPCM_IMA_DK4,
300 CODEC_ID_ADPCM_IMA_WS,
301 CODEC_ID_ADPCM_IMA_SMJPEG,
310 CODEC_ID_ADPCM_YAMAHA,
311 CODEC_ID_ADPCM_SBPRO_4,
312 CODEC_ID_ADPCM_SBPRO_3,
313 CODEC_ID_ADPCM_SBPRO_2,
315 CODEC_ID_ADPCM_IMA_AMV,
316 CODEC_ID_ADPCM_EA_R1,
317 CODEC_ID_ADPCM_EA_R3,
318 CODEC_ID_ADPCM_EA_R2,
319 CODEC_ID_ADPCM_IMA_EA_SEAD,
320 CODEC_ID_ADPCM_IMA_EA_EACS,
321 CODEC_ID_ADPCM_EA_XAS,
322 CODEC_ID_ADPCM_EA_MAXIS_XA,
323 CODEC_ID_ADPCM_IMA_ISS,
327 CODEC_ID_AMR_NB = 0x12000,
330 /* RealAudio codecs*/
331 CODEC_ID_RA_144 = 0x13000,
334 /* various DPCM codecs */
335 CODEC_ID_ROQ_DPCM = 0x14000,
336 CODEC_ID_INTERPLAY_DPCM,
341 CODEC_ID_MP2 = 0x15000,
342 CODEC_ID_MP3, ///< preferred ID for decoding MPEG audio layer 1, 2 or 3
353 #if LIBAVCODEC_VERSION_MAJOR == 53
362 CODEC_ID_WESTWOOD_SND1,
363 CODEC_ID_GSM, ///< as in Berlin toast format
371 CODEC_ID_DSICINAUDIO,
375 CODEC_ID_GSM_MS, /* as found in WAV */
384 CODEC_ID_WMALOSSLESS,
393 CODEC_ID_BINKAUDIO_RDFT,
394 CODEC_ID_BINKAUDIO_DCT,
398 #if LIBAVCODEC_VERSION_MAJOR > 53
399 CODEC_ID_G723_1_DEPRECATED,
400 CODEC_ID_G729_DEPRECATED,
405 CODEC_ID_G729 = 0x15800,
406 CODEC_ID_G723_1= 0x15801,
407 CODEC_ID_FFWAVESYNTH = MKBETAG('F','F','W','S'),
408 CODEC_ID_8SVX_RAW = MKBETAG('8','S','V','X'),
410 /* subtitle codecs */
411 CODEC_ID_FIRST_SUBTITLE = 0x17000, ///< A dummy ID pointing at the start of subtitle codecs.
412 CODEC_ID_DVD_SUBTITLE = 0x17000,
413 CODEC_ID_DVB_SUBTITLE,
414 CODEC_ID_TEXT, ///< raw UTF-8 text
418 CODEC_ID_HDMV_PGS_SUBTITLE,
419 CODEC_ID_DVB_TELETEXT,
421 CODEC_ID_MICRODVD = MKBETAG('m','D','V','D'),
423 /* other specific kind of codecs (generally used for attachments) */
424 CODEC_ID_FIRST_UNKNOWN = 0x18000, ///< A dummy ID pointing at the start of various fake codecs.
425 CODEC_ID_TTF = 0x18000,
426 CODEC_ID_BINTEXT = MKBETAG('B','T','X','T'),
427 CODEC_ID_XBIN = MKBETAG('X','B','I','N'),
428 CODEC_ID_IDF = MKBETAG( 0 ,'I','D','F'),
430 CODEC_ID_PROBE = 0x19000, ///< codec_id is not known (like CODEC_ID_NONE) but lavf should attempt to identify it
432 CODEC_ID_MPEG2TS = 0x20000, /**< _FAKE_ codec to indicate a raw MPEG-2 TS
433 * stream (only used by libavformat) */
434 CODEC_ID_MPEG4SYSTEMS = 0x20001, /**< _FAKE_ codec to indicate a MPEG-4 Systems
435 * stream (only used by libavformat) */
436 CODEC_ID_FFMETADATA = 0x21000, ///< Dummy codec for streams containing only metadata information.
439 #if FF_API_OLD_SAMPLE_FMT
440 #define SampleFormat AVSampleFormat
442 #define SAMPLE_FMT_NONE AV_SAMPLE_FMT_NONE
443 #define SAMPLE_FMT_U8 AV_SAMPLE_FMT_U8
444 #define SAMPLE_FMT_S16 AV_SAMPLE_FMT_S16
445 #define SAMPLE_FMT_S32 AV_SAMPLE_FMT_S32
446 #define SAMPLE_FMT_FLT AV_SAMPLE_FMT_FLT
447 #define SAMPLE_FMT_DBL AV_SAMPLE_FMT_DBL
448 #define SAMPLE_FMT_NB AV_SAMPLE_FMT_NB
451 #if FF_API_OLD_AUDIOCONVERT
452 #include "libavutil/audioconvert.h"
454 /* Audio channel masks */
455 #define CH_FRONT_LEFT AV_CH_FRONT_LEFT
456 #define CH_FRONT_RIGHT AV_CH_FRONT_RIGHT
457 #define CH_FRONT_CENTER AV_CH_FRONT_CENTER
458 #define CH_LOW_FREQUENCY AV_CH_LOW_FREQUENCY
459 #define CH_BACK_LEFT AV_CH_BACK_LEFT
460 #define CH_BACK_RIGHT AV_CH_BACK_RIGHT
461 #define CH_FRONT_LEFT_OF_CENTER AV_CH_FRONT_LEFT_OF_CENTER
462 #define CH_FRONT_RIGHT_OF_CENTER AV_CH_FRONT_RIGHT_OF_CENTER
463 #define CH_BACK_CENTER AV_CH_BACK_CENTER
464 #define CH_SIDE_LEFT AV_CH_SIDE_LEFT
465 #define CH_SIDE_RIGHT AV_CH_SIDE_RIGHT
466 #define CH_TOP_CENTER AV_CH_TOP_CENTER
467 #define CH_TOP_FRONT_LEFT AV_CH_TOP_FRONT_LEFT
468 #define CH_TOP_FRONT_CENTER AV_CH_TOP_FRONT_CENTER
469 #define CH_TOP_FRONT_RIGHT AV_CH_TOP_FRONT_RIGHT
470 #define CH_TOP_BACK_LEFT AV_CH_TOP_BACK_LEFT
471 #define CH_TOP_BACK_CENTER AV_CH_TOP_BACK_CENTER
472 #define CH_TOP_BACK_RIGHT AV_CH_TOP_BACK_RIGHT
473 #define CH_STEREO_LEFT AV_CH_STEREO_LEFT
474 #define CH_STEREO_RIGHT AV_CH_STEREO_RIGHT
476 /** Channel mask value used for AVCodecContext.request_channel_layout
477 to indicate that the user requests the channel order of the decoder output
478 to be the native codec channel order. */
479 #define CH_LAYOUT_NATIVE AV_CH_LAYOUT_NATIVE
481 /* Audio channel convenience macros */
482 #define CH_LAYOUT_MONO AV_CH_LAYOUT_MONO
483 #define CH_LAYOUT_STEREO AV_CH_LAYOUT_STEREO
484 #define CH_LAYOUT_2_1 AV_CH_LAYOUT_2_1
485 #define CH_LAYOUT_SURROUND AV_CH_LAYOUT_SURROUND
486 #define CH_LAYOUT_4POINT0 AV_CH_LAYOUT_4POINT0
487 #define CH_LAYOUT_2_2 AV_CH_LAYOUT_2_2
488 #define CH_LAYOUT_QUAD AV_CH_LAYOUT_QUAD
489 #define CH_LAYOUT_5POINT0 AV_CH_LAYOUT_5POINT0
490 #define CH_LAYOUT_5POINT1 AV_CH_LAYOUT_5POINT1
491 #define CH_LAYOUT_5POINT0_BACK AV_CH_LAYOUT_5POINT0_BACK
492 #define CH_LAYOUT_5POINT1_BACK AV_CH_LAYOUT_5POINT1_BACK
493 #define CH_LAYOUT_7POINT0 AV_CH_LAYOUT_7POINT0
494 #define CH_LAYOUT_7POINT1 AV_CH_LAYOUT_7POINT1
495 #define CH_LAYOUT_7POINT1_WIDE AV_CH_LAYOUT_7POINT1_WIDE
496 #define CH_LAYOUT_STEREO_DOWNMIX AV_CH_LAYOUT_STEREO_DOWNMIX
499 #if FF_API_OLD_DECODE_AUDIO
501 #define AVCODEC_MAX_AUDIO_FRAME_SIZE 192000 // 1 second of 48khz 32bit audio
505 * Required number of additionally allocated bytes at the end of the input bitstream for decoding.
506 * This is mainly needed because some optimized bitstream readers read
507 * 32 or 64 bit at once and could read over the end.<br>
508 * Note: If the first 23 bits of the additional bytes are not 0, then damaged
509 * MPEG bitstreams could cause overread and segfault.
511 #define FF_INPUT_BUFFER_PADDING_SIZE 16
514 * minimum encoding buffer size
515 * Used to avoid some checks during header writing.
517 #define FF_MIN_BUFFER_SIZE 16384
521 * motion estimation type.
524 ME_ZERO = 1, ///< no search, that is use 0,0 vector whenever one is needed
528 ME_EPZS, ///< enhanced predictive zonal search
529 ME_X1, ///< reserved for experiments
530 ME_HEX, ///< hexagon based search
531 ME_UMH, ///< uneven multi-hexagon search
532 ME_ITER, ///< iterative search
533 ME_TESA, ///< transformed exhaustive search algorithm
537 /* We leave some space between them for extensions (drop some
538 * keyframes for intra-only or drop just some bidir frames). */
539 AVDISCARD_NONE =-16, ///< discard nothing
540 AVDISCARD_DEFAULT= 0, ///< discard useless packets like 0 size packets in avi
541 AVDISCARD_NONREF = 8, ///< discard all non reference
542 AVDISCARD_BIDIR = 16, ///< discard all bidirectional frames
543 AVDISCARD_NONKEY = 32, ///< discard all frames except keyframes
544 AVDISCARD_ALL = 48, ///< discard all
547 enum AVColorPrimaries{
548 AVCOL_PRI_BT709 =1, ///< also ITU-R BT1361 / IEC 61966-2-4 / SMPTE RP177 Annex B
549 AVCOL_PRI_UNSPECIFIED=2,
551 AVCOL_PRI_BT470BG =5, ///< also ITU-R BT601-6 625 / ITU-R BT1358 625 / ITU-R BT1700 625 PAL & SECAM
552 AVCOL_PRI_SMPTE170M =6, ///< also ITU-R BT601-6 525 / ITU-R BT1358 525 / ITU-R BT1700 NTSC
553 AVCOL_PRI_SMPTE240M =7, ///< functionally identical to above
555 AVCOL_PRI_NB , ///< Not part of ABI
558 enum AVColorTransferCharacteristic{
559 AVCOL_TRC_BT709 =1, ///< also ITU-R BT1361
560 AVCOL_TRC_UNSPECIFIED=2,
561 AVCOL_TRC_GAMMA22 =4, ///< also ITU-R BT470M / ITU-R BT1700 625 PAL & SECAM
562 AVCOL_TRC_GAMMA28 =5, ///< also ITU-R BT470BG
563 AVCOL_TRC_SMPTE240M =7,
564 AVCOL_TRC_NB , ///< Not part of ABI
569 AVCOL_SPC_BT709 =1, ///< also ITU-R BT1361 / IEC 61966-2-4 xvYCC709 / SMPTE RP177 Annex B
570 AVCOL_SPC_UNSPECIFIED=2,
572 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
573 AVCOL_SPC_SMPTE170M =6, ///< also ITU-R BT601-6 525 / ITU-R BT1358 525 / ITU-R BT1700 NTSC / functionally identical to above
574 AVCOL_SPC_SMPTE240M =7,
576 AVCOL_SPC_NB , ///< Not part of ABI
580 AVCOL_RANGE_UNSPECIFIED=0,
581 AVCOL_RANGE_MPEG =1, ///< the normal 219*2^(n-8) "MPEG" YUV ranges
582 AVCOL_RANGE_JPEG =2, ///< the normal 2^n-1 "JPEG" YUV ranges
583 AVCOL_RANGE_NB , ///< Not part of ABI
587 * X X 3 4 X X are luma samples,
588 * 1 2 1-6 are possible chroma positions
589 * X X 5 6 X 0 is undefined/unknown position
591 enum AVChromaLocation{
592 AVCHROMA_LOC_UNSPECIFIED=0,
593 AVCHROMA_LOC_LEFT =1, ///< mpeg2/4, h264 default
594 AVCHROMA_LOC_CENTER =2, ///< mpeg1, jpeg, h263
595 AVCHROMA_LOC_TOPLEFT =3, ///< DV
597 AVCHROMA_LOC_BOTTOMLEFT =5,
598 AVCHROMA_LOC_BOTTOM =6,
599 AVCHROMA_LOC_NB , ///< Not part of ABI
602 #if FF_API_FLAC_GLOBAL_OPTS
607 AV_LPC_TYPE_DEFAULT = -1, ///< use the codec default LPC type
608 AV_LPC_TYPE_NONE = 0, ///< do not use LPC prediction or use all zero coefficients
609 AV_LPC_TYPE_FIXED = 1, ///< fixed LPC coefficients
610 AV_LPC_TYPE_LEVINSON = 2, ///< Levinson-Durbin recursion
611 AV_LPC_TYPE_CHOLESKY = 3, ///< Cholesky factorization
612 AV_LPC_TYPE_NB , ///< Not part of ABI
616 enum AVAudioServiceType {
617 AV_AUDIO_SERVICE_TYPE_MAIN = 0,
618 AV_AUDIO_SERVICE_TYPE_EFFECTS = 1,
619 AV_AUDIO_SERVICE_TYPE_VISUALLY_IMPAIRED = 2,
620 AV_AUDIO_SERVICE_TYPE_HEARING_IMPAIRED = 3,
621 AV_AUDIO_SERVICE_TYPE_DIALOGUE = 4,
622 AV_AUDIO_SERVICE_TYPE_COMMENTARY = 5,
623 AV_AUDIO_SERVICE_TYPE_EMERGENCY = 6,
624 AV_AUDIO_SERVICE_TYPE_VOICE_OVER = 7,
625 AV_AUDIO_SERVICE_TYPE_KARAOKE = 8,
626 AV_AUDIO_SERVICE_TYPE_NB , ///< Not part of ABI
629 typedef struct RcOverride{
632 int qscale; // If this is 0 then quality_factor will be used instead.
633 float quality_factor;
636 #define FF_MAX_B_FRAMES 16
639 These flags can be passed in AVCodecContext.flags before initialization.
640 Note: Not everything is supported yet.
643 #define CODEC_FLAG_QSCALE 0x0002 ///< Use fixed qscale.
644 #define CODEC_FLAG_4MV 0x0004 ///< 4 MV per MB allowed / advanced prediction for H.263.
645 #define CODEC_FLAG_QPEL 0x0010 ///< Use qpel MC.
646 #define CODEC_FLAG_GMC 0x0020 ///< Use GMC.
647 #define CODEC_FLAG_MV0 0x0040 ///< Always try a MB with MV=<0,0>.
649 * The parent program guarantees that the input for B-frames containing
650 * streams is not written to for at least s->max_b_frames+1 frames, if
651 * this is not set the input will be copied.
653 #define CODEC_FLAG_INPUT_PRESERVED 0x0100
654 #define CODEC_FLAG_PASS1 0x0200 ///< Use internal 2pass ratecontrol in first pass mode.
655 #define CODEC_FLAG_PASS2 0x0400 ///< Use internal 2pass ratecontrol in second pass mode.
656 #define CODEC_FLAG_GRAY 0x2000 ///< Only decode/encode grayscale.
657 #define CODEC_FLAG_EMU_EDGE 0x4000 ///< Don't draw edges.
658 #define CODEC_FLAG_PSNR 0x8000 ///< error[?] variables will be set during encoding.
659 #define CODEC_FLAG_TRUNCATED 0x00010000 /** Input bitstream might be truncated at a random
660 location instead of only at frame boundaries. */
661 #define CODEC_FLAG_NORMALIZE_AQP 0x00020000 ///< Normalize adaptive quantization.
662 #define CODEC_FLAG_INTERLACED_DCT 0x00040000 ///< Use interlaced DCT.
663 #define CODEC_FLAG_LOW_DELAY 0x00080000 ///< Force low delay.
664 #define CODEC_FLAG_GLOBAL_HEADER 0x00400000 ///< Place global headers in extradata instead of every keyframe.
665 #define CODEC_FLAG_BITEXACT 0x00800000 ///< Use only bitexact stuff (except (I)DCT).
666 /* Fx : Flag for h263+ extra options */
667 #define CODEC_FLAG_AC_PRED 0x01000000 ///< H.263 advanced intra coding / MPEG-4 AC prediction
668 #define CODEC_FLAG_CBP_RD 0x04000000 ///< Use rate distortion optimization for cbp.
669 #define CODEC_FLAG_QP_RD 0x08000000 ///< Use rate distortion optimization for qp selectioon.
670 #define CODEC_FLAG_LOOP_FILTER 0x00000800 ///< loop filter
671 #define CODEC_FLAG_INTERLACED_ME 0x20000000 ///< interlaced motion estimation
672 #define CODEC_FLAG_CLOSED_GOP 0x80000000
673 #define CODEC_FLAG2_FAST 0x00000001 ///< Allow non spec compliant speedup tricks.
674 #define CODEC_FLAG2_STRICT_GOP 0x00000002 ///< Strictly enforce GOP size.
675 #define CODEC_FLAG2_NO_OUTPUT 0x00000004 ///< Skip bitstream encoding.
676 #define CODEC_FLAG2_LOCAL_HEADER 0x00000008 ///< Place global headers at every keyframe instead of in extradata.
677 #define CODEC_FLAG2_SKIP_RD 0x00004000 ///< RD optimal MB level residual skipping
678 #define CODEC_FLAG2_CHUNKS 0x00008000 ///< Input bitstream might be truncated at a packet boundaries instead of only at frame boundaries.
679 #define CODEC_FLAG2_SHOW_ALL 0x00400000 ///< Show all frames before the first keyframe
681 * @defgroup deprecated_flags Deprecated codec flags
682 * Use corresponding private codec options instead.
685 #if FF_API_MPEGVIDEO_GLOBAL_OPTS
686 #define CODEC_FLAG_OBMC 0x00000001 ///< OBMC
687 #define CODEC_FLAG_H263P_AIV 0x00000008 ///< H.263 alternative inter VLC
688 #define CODEC_FLAG_PART 0x0080 ///< Use data partitioning.
689 #define CODEC_FLAG_ALT_SCAN 0x00100000 ///< Use alternate scan.
690 #define CODEC_FLAG_H263P_UMV 0x02000000 ///< unlimited motion vector
691 #define CODEC_FLAG_H263P_SLICE_STRUCT 0x10000000
692 #define CODEC_FLAG_SVCD_SCAN_OFFSET 0x40000000 ///< Will reserve space for SVCD scan offset user data.
693 #define CODEC_FLAG2_INTRA_VLC 0x00000800 ///< Use MPEG-2 intra VLC table.
694 #define CODEC_FLAG2_DROP_FRAME_TIMECODE 0x00002000 ///< timecode is in drop frame format.
695 #define CODEC_FLAG2_NON_LINEAR_QUANT 0x00010000 ///< Use MPEG-2 nonlinear quantizer.
697 #if FF_API_MJPEG_GLOBAL_OPTS
698 #define CODEC_FLAG_EXTERN_HUFF 0x1000 ///< Use external Huffman table (for MJPEG).
700 #if FF_API_X264_GLOBAL_OPTS
701 #define CODEC_FLAG2_BPYRAMID 0x00000010 ///< H.264 allow B-frames to be used as references.
702 #define CODEC_FLAG2_WPRED 0x00000020 ///< H.264 weighted biprediction for B-frames
703 #define CODEC_FLAG2_MIXED_REFS 0x00000040 ///< H.264 one reference per partition, as opposed to one reference per macroblock
704 #define CODEC_FLAG2_8X8DCT 0x00000080 ///< H.264 high profile 8x8 transform
705 #define CODEC_FLAG2_FASTPSKIP 0x00000100 ///< H.264 fast pskip
706 #define CODEC_FLAG2_AUD 0x00000200 ///< H.264 access unit delimiters
707 #define CODEC_FLAG2_BRDO 0x00000400 ///< B-frame rate-distortion optimization
708 #define CODEC_FLAG2_MBTREE 0x00040000 ///< Use macroblock tree ratecontrol (x264 only)
709 #define CODEC_FLAG2_PSY 0x00080000 ///< Use psycho visual optimizations.
710 #define CODEC_FLAG2_SSIM 0x00100000 ///< Compute SSIM during encoding, error[] values are undefined.
711 #define CODEC_FLAG2_INTRA_REFRESH 0x00200000 ///< Use periodic insertion of intra blocks instead of keyframes.
713 #if FF_API_SNOW_GLOBAL_OPTS
714 #define CODEC_FLAG2_MEMC_ONLY 0x00001000 ///< Only do ME/MC (I frames -> ref, P frame -> ME+MC).
716 #if FF_API_LAME_GLOBAL_OPTS
717 #define CODEC_FLAG2_BIT_RESERVOIR 0x00020000 ///< Use a bit reservoir when encoding if possible
723 /* Unsupported options :
724 * Syntax Arithmetic coding (SAC)
725 * Reference Picture Selection
726 * Independent Segment Decoding */
728 /* codec capabilities */
730 #define CODEC_CAP_DRAW_HORIZ_BAND 0x0001 ///< Decoder can use draw_horiz_band callback.
732 * Codec uses get_buffer() for allocating buffers and supports custom allocators.
733 * If not set, it might not use get_buffer() at all or use operations that
734 * assume the buffer was allocated by avcodec_default_get_buffer.
736 #define CODEC_CAP_DR1 0x0002
737 #if FF_API_PARSE_FRAME
738 /* If 'parse_only' field is true, then avcodec_parse_frame() can be used. */
739 #define CODEC_CAP_PARSE_ONLY 0x0004
741 #define CODEC_CAP_TRUNCATED 0x0008
742 /* Codec can export data for HW decoding (XvMC). */
743 #define CODEC_CAP_HWACCEL 0x0010
745 * Codec has a nonzero delay and needs to be fed with avpkt->data=NULL,
746 * avpkt->size=0 at the end to get the delayed data until the decoder no longer
747 * returns frames. If this is not set, the codec is guaranteed to never be fed
750 #define CODEC_CAP_DELAY 0x0020
752 * Codec can be fed a final frame with a smaller size.
753 * This can be used to prevent truncation of the last audio samples.
755 #define CODEC_CAP_SMALL_LAST_FRAME 0x0040
757 * Codec can export data for HW decoding (VDPAU).
759 #define CODEC_CAP_HWACCEL_VDPAU 0x0080
761 * Codec can output multiple frames per AVPacket
762 * Normally demuxers return one frame at a time, demuxers which do not do
763 * are connected to a parser to split what they return into proper frames.
764 * This flag is reserved to the very rare category of codecs which have a
765 * bitstream that cannot be split into frames without timeconsuming
766 * operations like full decoding. Demuxers carring such bitstreams thus
767 * may return multiple frames in a packet. This has many disadvantages like
768 * prohibiting stream copy in many cases thus it should only be considered
771 #define CODEC_CAP_SUBFRAMES 0x0100
773 * Codec is experimental and is thus avoided in favor of non experimental
776 #define CODEC_CAP_EXPERIMENTAL 0x0200
778 * Codec should fill in channel configuration and samplerate instead of container
780 #define CODEC_CAP_CHANNEL_CONF 0x0400
783 * Codec is able to deal with negative linesizes
785 #define CODEC_CAP_NEG_LINESIZES 0x0800
788 * Codec supports frame-level multithreading.
790 #define CODEC_CAP_FRAME_THREADS 0x1000
792 * Codec supports slice-based (or partition-based) multithreading.
794 #define CODEC_CAP_SLICE_THREADS 0x2000
796 * Codec supports changed parameters at any point.
798 #define CODEC_CAP_PARAM_CHANGE 0x4000
800 * Codec supports avctx->thread_count == 0 (auto).
802 #define CODEC_CAP_AUTO_THREADS 0x8000
806 #define CODEC_CAP_LOSSLESS 0x80000000
808 //The following defines may change, don't expect compatibility if you use them.
809 #define MB_TYPE_INTRA4x4 0x0001
810 #define MB_TYPE_INTRA16x16 0x0002 //FIXME H.264-specific
811 #define MB_TYPE_INTRA_PCM 0x0004 //FIXME H.264-specific
812 #define MB_TYPE_16x16 0x0008
813 #define MB_TYPE_16x8 0x0010
814 #define MB_TYPE_8x16 0x0020
815 #define MB_TYPE_8x8 0x0040
816 #define MB_TYPE_INTERLACED 0x0080
817 #define MB_TYPE_DIRECT2 0x0100 //FIXME
818 #define MB_TYPE_ACPRED 0x0200
819 #define MB_TYPE_GMC 0x0400
820 #define MB_TYPE_SKIP 0x0800
821 #define MB_TYPE_P0L0 0x1000
822 #define MB_TYPE_P1L0 0x2000
823 #define MB_TYPE_P0L1 0x4000
824 #define MB_TYPE_P1L1 0x8000
825 #define MB_TYPE_L0 (MB_TYPE_P0L0 | MB_TYPE_P1L0)
826 #define MB_TYPE_L1 (MB_TYPE_P0L1 | MB_TYPE_P1L1)
827 #define MB_TYPE_L0L1 (MB_TYPE_L0 | MB_TYPE_L1)
828 #define MB_TYPE_QUANT 0x00010000
829 #define MB_TYPE_CBP 0x00020000
830 //Note bits 24-31 are reserved for codec specific use (h264 ref0, mpeg1 0mv, ...)
834 * This specifies the area which should be displayed.
835 * Note there may be multiple such areas for one frame.
837 typedef struct AVPanScan{
840 * - encoding: Set by user.
841 * - decoding: Set by libavcodec.
846 * width and height in 1/16 pel
847 * - encoding: Set by user.
848 * - decoding: Set by libavcodec.
854 * position of the top left corner in 1/16 pel for up to 3 fields/frames
855 * - encoding: Set by user.
856 * - decoding: Set by libavcodec.
858 int16_t position[3][2];
861 #define FF_QSCALE_TYPE_MPEG1 0
862 #define FF_QSCALE_TYPE_MPEG2 1
863 #define FF_QSCALE_TYPE_H264 2
864 #define FF_QSCALE_TYPE_VP56 3
866 #define FF_BUFFER_TYPE_INTERNAL 1
867 #define FF_BUFFER_TYPE_USER 2 ///< direct rendering buffers (image is (de)allocated by user)
868 #define FF_BUFFER_TYPE_SHARED 4 ///< Buffer from somewhere else; don't deallocate image (data/base), all other tables are not shared.
869 #define FF_BUFFER_TYPE_COPY 8 ///< Just a (modified) copy of some other buffer, don't deallocate anything.
871 #if FF_API_OLD_FF_PICT_TYPES
872 /* DEPRECATED, directly use the AV_PICTURE_TYPE_* enum values */
873 #define FF_I_TYPE AV_PICTURE_TYPE_I ///< Intra
874 #define FF_P_TYPE AV_PICTURE_TYPE_P ///< Predicted
875 #define FF_B_TYPE AV_PICTURE_TYPE_B ///< Bi-dir predicted
876 #define FF_S_TYPE AV_PICTURE_TYPE_S ///< S(GMC)-VOP MPEG4
877 #define FF_SI_TYPE AV_PICTURE_TYPE_SI ///< Switching Intra
878 #define FF_SP_TYPE AV_PICTURE_TYPE_SP ///< Switching Predicted
879 #define FF_BI_TYPE AV_PICTURE_TYPE_BI
882 #define FF_BUFFER_HINTS_VALID 0x01 // Buffer hints value is meaningful (if 0 ignore).
883 #define FF_BUFFER_HINTS_READABLE 0x02 // Codec will read from buffer.
884 #define FF_BUFFER_HINTS_PRESERVE 0x04 // User must not alter buffer content.
885 #define FF_BUFFER_HINTS_REUSABLE 0x08 // Codec will reuse the buffer (update).
887 enum AVPacketSideDataType {
889 AV_PKT_DATA_NEW_EXTRADATA,
890 AV_PKT_DATA_PARAM_CHANGE,
893 typedef struct AVPacket {
895 * Presentation timestamp in AVStream->time_base units; the time at which
896 * the decompressed packet will be presented to the user.
897 * Can be AV_NOPTS_VALUE if it is not stored in the file.
898 * pts MUST be larger or equal to dts as presentation cannot happen before
899 * decompression, unless one wants to view hex dumps. Some formats misuse
900 * the terms dts and pts/cts to mean something different. Such timestamps
901 * must be converted to true pts/dts before they are stored in AVPacket.
905 * Decompression timestamp in AVStream->time_base units; the time at which
906 * the packet is decompressed.
907 * Can be AV_NOPTS_VALUE if it is not stored in the file.
914 * A combination of AV_PKT_FLAG values
918 * Additional packet data that can be provided by the container.
919 * Packet can contain several types of side information.
924 enum AVPacketSideDataType type;
929 * Duration of this packet in AVStream->time_base units, 0 if unknown.
930 * Equals next_pts - this_pts in presentation order.
933 void (*destruct)(struct AVPacket *);
935 int64_t pos; ///< byte position in stream, -1 if unknown
938 * Time difference in AVStream->time_base units from the pts of this
939 * packet to the point at which the output from the decoder has converged
940 * independent from the availability of previous frames. That is, the
941 * frames are virtually identical no matter if decoding started from
942 * the very first frame or from this keyframe.
943 * Is AV_NOPTS_VALUE if unknown.
944 * This field is not the display duration of the current packet.
945 * This field has no meaning if the packet does not have AV_PKT_FLAG_KEY
948 * The purpose of this field is to allow seeking in streams that have no
949 * keyframes in the conventional sense. It corresponds to the
950 * recovery point SEI in H.264 and match_time_delta in NUT. It is also
951 * essential for some types of subtitle streams to ensure that all
952 * subtitles are correctly displayed after seeking.
954 int64_t convergence_duration;
956 #define AV_PKT_FLAG_KEY 0x0001 ///< The packet contains a keyframe
957 #define AV_PKT_FLAG_CORRUPT 0x0002 ///< The packet content is corrupted
960 * An AV_PKT_DATA_PARAM_CHANGE side data packet is laid out as follows:
962 * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_COUNT)
963 * s32le channel_count
964 * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_LAYOUT)
965 * u64le channel_layout
966 * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_SAMPLE_RATE)
968 * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_DIMENSIONS)
973 enum AVSideDataParamChangeFlags {
974 AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_COUNT = 0x0001,
975 AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_LAYOUT = 0x0002,
976 AV_SIDE_DATA_PARAM_CHANGE_SAMPLE_RATE = 0x0004,
977 AV_SIDE_DATA_PARAM_CHANGE_DIMENSIONS = 0x0008,
982 * New fields can be added to the end of AVFRAME with minor version
983 * bumps. Similarly fields that are marked as to be only accessed by
984 * av_opt_ptr() can be reordered. This allows 2 forks to add fields
985 * without breaking compatibility with each other.
986 * Removal, reordering and changes in the remaining cases require
987 * a major version bump.
988 * sizeof(AVFrame) must not be used outside libavcodec.
990 typedef struct AVFrame {
991 #if FF_API_DATA_POINTERS
992 #define AV_NUM_DATA_POINTERS 4
994 #define AV_NUM_DATA_POINTERS 8
997 * pointer to the picture/channel planes.
998 * This might be different from the first allocated byte
999 * - encoding: Set by user
1000 * - decoding: set by AVCodecContext.get_buffer()
1002 uint8_t *data[AV_NUM_DATA_POINTERS];
1005 * Size, in bytes, of the data for each picture/channel plane.
1007 * For audio, only linesize[0] may be set. For planar audio, each channel
1008 * plane must be the same size.
1010 * - encoding: Set by user (video only)
1011 * - decoding: set by AVCodecContext.get_buffer()
1013 int linesize[AV_NUM_DATA_POINTERS];
1016 * pointer to the first allocated byte of the picture. Can be used in get_buffer/release_buffer.
1017 * This isn't used by libavcodec unless the default get/release_buffer() is used.
1021 uint8_t *base[AV_NUM_DATA_POINTERS];
1023 * 1 -> keyframe, 0-> not
1024 * - encoding: Set by libavcodec.
1025 * - decoding: Set by libavcodec.
1030 * Picture type of the frame, see ?_TYPE below.
1031 * - encoding: Set by libavcodec. for coded_picture (and set by user for input).
1032 * - decoding: Set by libavcodec.
1034 enum AVPictureType pict_type;
1037 * presentation timestamp in time_base units (time when frame should be shown to user)
1038 * If AV_NOPTS_VALUE then frame_rate = 1/time_base will be assumed.
1039 * - encoding: MUST be set by user.
1040 * - decoding: Set by libavcodec.
1045 * picture number in bitstream order
1046 * - encoding: set by
1047 * - decoding: Set by libavcodec.
1049 int coded_picture_number;
1051 * picture number in display order
1052 * - encoding: set by
1053 * - decoding: Set by libavcodec.
1055 int display_picture_number;
1058 * quality (between 1 (good) and FF_LAMBDA_MAX (bad))
1059 * - encoding: Set by libavcodec. for coded_picture (and set by user for input).
1060 * - decoding: Set by libavcodec.
1064 #if FF_API_AVFRAME_AGE
1066 * @deprecated unused
1068 attribute_deprecated int age;
1072 * is this picture used as reference
1073 * The values for this are the same as the MpegEncContext.picture_structure
1074 * variable, that is 1->top field, 2->bottom field, 3->frame/both fields.
1075 * Set to 4 for delayed, non-reference frames.
1076 * - encoding: unused
1077 * - decoding: Set by libavcodec. (before get_buffer() call)).
1083 * - encoding: unused
1084 * - decoding: Set by libavcodec.
1086 int8_t *qscale_table;
1089 * - encoding: unused
1090 * - decoding: Set by libavcodec.
1095 * mbskip_table[mb]>=1 if MB didn't change
1096 * stride= mb_width = (width+15)>>4
1097 * - encoding: unused
1098 * - decoding: Set by libavcodec.
1100 uint8_t *mbskip_table;
1103 * motion vector table
1106 * int mv_sample_log2= 4 - motion_subsample_log2;
1107 * int mb_width= (width+15)>>4;
1108 * int mv_stride= (mb_width << mv_sample_log2) + 1;
1109 * motion_val[direction][x + y*mv_stride][0->mv_x, 1->mv_y];
1111 * - encoding: Set by user.
1112 * - decoding: Set by libavcodec.
1114 int16_t (*motion_val[2])[2];
1117 * macroblock type table
1118 * mb_type_base + mb_width + 2
1119 * - encoding: Set by user.
1120 * - decoding: Set by libavcodec.
1125 * log2 of the size of the block which a single vector in motion_val represents:
1126 * (4->16x16, 3->8x8, 2-> 4x4, 1-> 2x2)
1127 * - encoding: unused
1128 * - decoding: Set by libavcodec.
1130 uint8_t motion_subsample_log2;
1133 * for some private data of the user
1134 * - encoding: unused
1135 * - decoding: Set by user.
1141 * - encoding: Set by libavcodec. if flags&CODEC_FLAG_PSNR.
1142 * - decoding: unused
1144 uint64_t error[AV_NUM_DATA_POINTERS];
1147 * type of the buffer (to keep track of who has to deallocate data[*])
1148 * - encoding: Set by the one who allocates it.
1149 * - decoding: Set by the one who allocates it.
1150 * Note: User allocated (direct rendering) & internal buffers cannot coexist currently.
1155 * When decoding, this signals how much the picture must be delayed.
1156 * extra_delay = repeat_pict / (2*fps)
1157 * - encoding: unused
1158 * - decoding: Set by libavcodec.
1168 * The content of the picture is interlaced.
1169 * - encoding: Set by user.
1170 * - decoding: Set by libavcodec. (default 0)
1172 int interlaced_frame;
1175 * If the content is interlaced, is top field displayed first.
1176 * - encoding: Set by user.
1177 * - decoding: Set by libavcodec.
1179 int top_field_first;
1183 * - encoding: Set by user.
1184 * - decoding: Set by libavcodec.
1186 AVPanScan *pan_scan;
1189 * Tell user application that palette has changed from previous frame.
1190 * - encoding: ??? (no palette-enabled encoder yet)
1191 * - decoding: Set by libavcodec. (default 0).
1193 int palette_has_changed;
1196 * codec suggestion on buffer type if != 0
1197 * - encoding: unused
1198 * - decoding: Set by libavcodec. (before get_buffer() call)).
1204 * - encoding: unused
1205 * - decoding: Set by libavcodec.
1210 * motion reference frame index
1211 * the order in which these are stored can depend on the codec.
1212 * - encoding: Set by user.
1213 * - decoding: Set by libavcodec.
1215 int8_t *ref_index[2];
1218 * reordered opaque 64bit (generally an integer or a double precision float
1219 * PTS but can be anything).
1220 * The user sets AVCodecContext.reordered_opaque to represent the input at
1222 * the decoder reorders values as needed and sets AVFrame.reordered_opaque
1223 * to exactly one of the values provided by the user through AVCodecContext.reordered_opaque
1224 * @deprecated in favor of pkt_pts
1225 * - encoding: unused
1226 * - decoding: Read by user.
1228 int64_t reordered_opaque;
1231 * hardware accelerator private data (FFmpeg-allocated)
1232 * - encoding: unused
1233 * - decoding: Set by libavcodec
1235 void *hwaccel_picture_private;
1238 * reordered pts from the last AVPacket that has been input into the decoder
1239 * - encoding: unused
1240 * - decoding: Read by user.
1245 * dts from the last AVPacket that has been input into the decoder
1246 * - encoding: unused
1247 * - decoding: Read by user.
1252 * the AVCodecContext which ff_thread_get_buffer() was last called on
1253 * - encoding: Set by libavcodec.
1254 * - decoding: Set by libavcodec.
1256 struct AVCodecContext *owner;
1259 * used by multithreading to store frame-specific info
1260 * - encoding: Set by libavcodec.
1261 * - decoding: Set by libavcodec.
1263 void *thread_opaque;
1266 * number of audio samples (per channel) described by this frame
1267 * - encoding: unused
1268 * - decoding: Set by libavcodec
1273 * pointers to the data planes/channels.
1275 * For video, this should simply point to data[].
1277 * For planar audio, each channel has a separate data pointer, and
1278 * linesize[0] contains the size of each channel buffer.
1279 * For packed audio, there is just one data pointer, and linesize[0]
1280 * contains the total size of the buffer for all channels.
1282 * Note: Both data and extended_data will always be set by get_buffer(),
1283 * but for planar audio with more channels that can fit in data,
1284 * extended_data must be used by the decoder in order to access all
1288 * decoding: set by AVCodecContext.get_buffer()
1290 uint8_t **extended_data;
1293 * sample aspect ratio for the video frame, 0/1 if unknown\unspecified
1294 * - encoding: unused
1295 * - decoding: Read by user.
1297 AVRational sample_aspect_ratio;
1300 * width and height of the video frame
1301 * - encoding: unused
1302 * - decoding: Read by user.
1307 * format of the frame, -1 if unknown or unset
1308 * Values correspond to enum PixelFormat for video frames,
1309 * enum AVSampleFormat for audio)
1310 * - encoding: unused
1311 * - decoding: Read by user.
1316 * frame timestamp estimated using various heuristics, in stream time base
1317 * Code outside libavcodec should access this field using:
1318 * av_opt_ptr(avcodec_get_frame_class(), frame, "best_effort_timestamp");
1319 * - encoding: unused
1320 * - decoding: set by libavcodec, read by user.
1322 int64_t best_effort_timestamp;
1325 * reordered pos from the last AVPacket that has been input into the decoder
1326 * Code outside libavcodec should access this field using:
1327 * av_opt_ptr(avcodec_get_frame_class(), frame, "pkt_pos");
1328 * - encoding: unused
1329 * - decoding: Read by user.
1335 struct AVCodecInternal;
1339 AV_FIELD_PROGRESSIVE,
1340 AV_FIELD_TT, //< Top coded_first, top displayed first
1341 AV_FIELD_BB, //< Bottom coded first, bottom displayed first
1342 AV_FIELD_TB, //< Top coded first, bottom displayed first
1343 AV_FIELD_BT, //< Bottom coded first, top displayed first
1347 * main external API structure.
1348 * New fields can be added to the end with minor version bumps.
1349 * Removal, reordering and changes to existing fields require a major
1351 * Please use AVOptions (av_opt* / av_set/get*()) to access these fields from user
1353 * sizeof(AVCodecContext) must not be used outside libav*.
1355 typedef struct AVCodecContext {
1357 * information on struct for av_log
1358 * - set by avcodec_alloc_context3
1360 const AVClass *av_class;
1362 * the average bitrate
1363 * - encoding: Set by user; unused for constant quantizer encoding.
1364 * - decoding: Set by libavcodec. 0 or some bitrate if this info is available in the stream.
1369 * number of bits the bitstream is allowed to diverge from the reference.
1370 * the reference can be CBR (for CBR pass1) or VBR (for pass2)
1371 * - encoding: Set by user; unused for constant quantizer encoding.
1372 * - decoding: unused
1374 int bit_rate_tolerance;
1378 * - encoding: Set by user.
1379 * - decoding: Set by user.
1384 * Some codecs need additional format info. It is stored here.
1385 * If any muxer uses this then ALL demuxers/parsers AND encoders for the
1386 * specific codec MUST set it correctly otherwise stream copy breaks.
1387 * In general use of this field by muxers is not recommended.
1388 * - encoding: Set by libavcodec.
1389 * - decoding: Set by libavcodec. (FIXME: Is this OK?)
1394 * Motion estimation algorithm used for video coding.
1395 * 1 (zero), 2 (full), 3 (log), 4 (phods), 5 (epzs), 6 (x1), 7 (hex),
1396 * 8 (umh), 9 (iter), 10 (tesa) [7, 8, 10 are x264 specific, 9 is snow specific]
1397 * - encoding: MUST be set by user.
1398 * - decoding: unused
1403 * some codecs need / can use extradata like Huffman tables.
1404 * mjpeg: Huffman tables
1405 * rv10: additional flags
1406 * mpeg4: global headers (they can be in the bitstream or here)
1407 * The allocated memory should be FF_INPUT_BUFFER_PADDING_SIZE bytes larger
1408 * than extradata_size to avoid prolems if it is read with the bitstream reader.
1409 * The bytewise contents of extradata must not depend on the architecture or CPU endianness.
1410 * - encoding: Set/allocated/freed by libavcodec.
1411 * - decoding: Set/allocated/freed by user.
1417 * This is the fundamental unit of time (in seconds) in terms
1418 * of which frame timestamps are represented. For fixed-fps content,
1419 * timebase should be 1/framerate and timestamp increments should be
1421 * - encoding: MUST be set by user.
1422 * - decoding: Set by libavcodec.
1424 AVRational time_base;
1428 * picture width / height.
1429 * - encoding: MUST be set by user.
1430 * - decoding: Set by libavcodec.
1431 * Note: For compatibility it is possible to set this instead of
1432 * coded_width/height before decoding.
1436 #define FF_ASPECT_EXTENDED 15
1439 * the number of pictures in a group of pictures, or 0 for intra_only
1440 * - encoding: Set by user.
1441 * - decoding: unused
1446 * Pixel format, see PIX_FMT_xxx.
1447 * May be set by the demuxer if known from headers.
1448 * May be overriden by the decoder if it knows better.
1449 * - encoding: Set by user.
1450 * - decoding: Set by user if known, overridden by libavcodec if known
1452 enum PixelFormat pix_fmt;
1455 * If non NULL, 'draw_horiz_band' is called by the libavcodec
1456 * decoder to draw a horizontal band. It improves cache usage. Not
1457 * all codecs can do that. You must check the codec capabilities
1459 * When multithreading is used, it may be called from multiple threads
1460 * at the same time; threads might draw different parts of the same AVFrame,
1461 * or multiple AVFrames, and there is no guarantee that slices will be drawn
1463 * The function is also used by hardware acceleration APIs.
1464 * It is called at least once during frame decoding to pass
1465 * the data needed for hardware render.
1466 * In that mode instead of pixel data, AVFrame points to
1467 * a structure specific to the acceleration API. The application
1468 * reads the structure and can change some fields to indicate progress
1470 * - encoding: unused
1471 * - decoding: Set by user.
1472 * @param height the height of the slice
1473 * @param y the y position of the slice
1474 * @param type 1->top field, 2->bottom field, 3->frame
1475 * @param offset offset into the AVFrame.data from which the slice should be read
1477 void (*draw_horiz_band)(struct AVCodecContext *s,
1478 const AVFrame *src, int offset[AV_NUM_DATA_POINTERS],
1479 int y, int type, int height);
1482 int sample_rate; ///< samples per second
1483 int channels; ///< number of audio channels
1486 * audio sample format
1487 * - encoding: Set by user.
1488 * - decoding: Set by libavcodec.
1490 enum AVSampleFormat sample_fmt; ///< sample format
1492 /* The following data should not be initialized. */
1494 * Samples per packet, initialized when calling 'init'.
1497 int frame_number; ///< audio or video frame number
1500 * Encoding: Number of frames delay there will be from the encoder input to
1501 * the decoder output. (we assume the decoder matches the spec)
1502 * Decoding: Number of frames delay in addition to what a standard decoder
1503 * as specified in the spec would produce.
1504 * - encoding: Set by libavcodec.
1505 * - decoding: Set by libavcodec.
1509 /* - encoding parameters */
1510 float qcompress; ///< amount of qscale change between easy & hard scenes (0.0-1.0)
1511 float qblur; ///< amount of qscale smoothing over time (0.0-1.0)
1515 * - encoding: Set by user.
1516 * - decoding: unused
1522 * - encoding: Set by user.
1523 * - decoding: unused
1528 * maximum quantizer difference between frames
1529 * - encoding: Set by user.
1530 * - decoding: unused
1535 * maximum number of B-frames between non-B-frames
1536 * Note: The output will be delayed by max_b_frames+1 relative to the input.
1537 * - encoding: Set by user.
1538 * - decoding: unused
1543 * qscale factor between IP and B-frames
1544 * If > 0 then the last P-frame quantizer will be used (q= lastp_q*factor+offset).
1545 * If < 0 then normal ratecontrol will be done (q= -normal_q*factor+offset).
1546 * - encoding: Set by user.
1547 * - decoding: unused
1549 float b_quant_factor;
1551 /** obsolete FIXME remove */
1553 #define FF_RC_STRATEGY_XVID 1
1555 int b_frame_strategy;
1557 struct AVCodec *codec;
1561 int rtp_payload_size; /* The size of the RTP payload: the coder will */
1562 /* do its best to deliver a chunk with size */
1563 /* below rtp_payload_size, the chunk will start */
1564 /* with a start code on some codecs like H.263. */
1565 /* This doesn't take account of any particular */
1566 /* headers inside the transmitted RTP payload. */
1569 /* The RTP callback: This function is called */
1570 /* every time the encoder has a packet to send. */
1571 /* It depends on the encoder if the data starts */
1572 /* with a Start Code (it should). H.263 does. */
1573 /* mb_nb contains the number of macroblocks */
1574 /* encoded in the RTP payload. */
1575 void (*rtp_callback)(struct AVCodecContext *avctx, void *data, int size, int mb_nb);
1577 /* statistics, used for 2-pass encoding */
1588 * number of bits used for the previously encoded frame
1589 * - encoding: Set by libavcodec.
1590 * - decoding: unused
1595 * Private data of the user, can be used to carry app specific stuff.
1596 * - encoding: Set by user.
1597 * - decoding: Set by user.
1601 char codec_name[32];
1602 enum AVMediaType codec_type; /* see AVMEDIA_TYPE_xxx */
1603 enum CodecID codec_id; /* see CODEC_ID_xxx */
1606 * fourcc (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A').
1607 * This is used to work around some encoder bugs.
1608 * A demuxer should set this to what is stored in the field used to identify the codec.
1609 * If there are multiple such fields in a container then the demuxer should choose the one
1610 * which maximizes the information about the used codec.
1611 * If the codec tag field in a container is larger than 32 bits then the demuxer should
1612 * remap the longer ID to 32 bits with a table or other structure. Alternatively a new
1613 * extra_codec_tag + size could be added but for this a clear advantage must be demonstrated
1615 * - encoding: Set by user, if not then the default based on codec_id will be used.
1616 * - decoding: Set by user, will be converted to uppercase by libavcodec during init.
1618 unsigned int codec_tag;
1621 * Work around bugs in encoders which sometimes cannot be detected automatically.
1622 * - encoding: Set by user
1623 * - decoding: Set by user
1625 int workaround_bugs;
1626 #define FF_BUG_AUTODETECT 1 ///< autodetection
1627 #define FF_BUG_OLD_MSMPEG4 2
1628 #define FF_BUG_XVID_ILACE 4
1629 #define FF_BUG_UMP4 8
1630 #define FF_BUG_NO_PADDING 16
1631 #define FF_BUG_AMV 32
1632 #define FF_BUG_AC_VLC 0 ///< Will be removed, libavcodec can now handle these non-compliant files by default.
1633 #define FF_BUG_QPEL_CHROMA 64
1634 #define FF_BUG_STD_QPEL 128
1635 #define FF_BUG_QPEL_CHROMA2 256
1636 #define FF_BUG_DIRECT_BLOCKSIZE 512
1637 #define FF_BUG_EDGE 1024
1638 #define FF_BUG_HPEL_CHROMA 2048
1639 #define FF_BUG_DC_CLIP 4096
1640 #define FF_BUG_MS 8192 ///< Work around various bugs in Microsoft's broken decoders.
1641 #define FF_BUG_TRUNCATED 16384
1642 //#define FF_BUG_FAKE_SCALABILITY 16 //Autodetection should work 100%.
1645 * luma single coefficient elimination threshold
1646 * - encoding: Set by user.
1647 * - decoding: unused
1649 int luma_elim_threshold;
1652 * chroma single coeff elimination threshold
1653 * - encoding: Set by user.
1654 * - decoding: unused
1656 int chroma_elim_threshold;
1659 * strictly follow the standard (MPEG4, ...).
1660 * - encoding: Set by user.
1661 * - decoding: Set by user.
1662 * Setting this to STRICT or higher means the encoder and decoder will
1663 * generally do stupid things, whereas setting it to unofficial or lower
1664 * will mean the encoder might produce output that is not supported by all
1665 * spec-compliant decoders. Decoders don't differentiate between normal,
1666 * unofficial and experimental (that is, they always try to decode things
1667 * when they can) unless they are explicitly asked to behave stupidly
1668 * (=strictly conform to the specs)
1670 int strict_std_compliance;
1671 #define FF_COMPLIANCE_VERY_STRICT 2 ///< Strictly conform to an older more strict version of the spec or reference software.
1672 #define FF_COMPLIANCE_STRICT 1 ///< Strictly conform to all the things in the spec no matter what consequences.
1673 #define FF_COMPLIANCE_NORMAL 0
1674 #define FF_COMPLIANCE_UNOFFICIAL -1 ///< Allow unofficial extensions
1675 #define FF_COMPLIANCE_EXPERIMENTAL -2 ///< Allow nonstandardized experimental things.
1678 * qscale offset between IP and B-frames
1679 * - encoding: Set by user.
1680 * - decoding: unused
1682 float b_quant_offset;
1686 * Error recognition; higher values will detect more errors but may
1687 * misdetect some more or less valid parts as errors.
1688 * - encoding: unused
1689 * - decoding: Set by user.
1691 attribute_deprecated int error_recognition;
1692 #define FF_ER_CAREFUL 1
1693 #define FF_ER_COMPLIANT 2
1694 #define FF_ER_AGGRESSIVE 3
1695 #define FF_ER_VERY_AGGRESSIVE 4
1696 #define FF_ER_EXPLODE 5
1697 #endif /* FF_API_ER */
1700 * Called at the beginning of each frame to get a buffer for it.
1702 * The function will set AVFrame.data[], AVFrame.linesize[].
1703 * AVFrame.extended_data[] must also be set, but it should be the same as
1704 * AVFrame.data[] except for planar audio with more channels than can fit
1705 * in AVFrame.data[]. In that case, AVFrame.data[] shall still contain as
1706 * many data pointers as it can hold.
1708 * if CODEC_CAP_DR1 is not set then get_buffer() must call
1709 * avcodec_default_get_buffer() instead of providing buffers allocated by
1712 * AVFrame.data[] should be 32- or 16-byte-aligned unless the CPU doesn't
1713 * need it. avcodec_default_get_buffer() aligns the output buffer properly,
1714 * but if get_buffer() is overridden then alignment considerations should
1715 * be taken into account.
1717 * @see avcodec_default_get_buffer()
1721 * If pic.reference is set then the frame will be read later by libavcodec.
1722 * avcodec_align_dimensions2() should be used to find the required width and
1723 * height, as they normally need to be rounded up to the next multiple of 16.
1725 * If frame multithreading is used and thread_safe_callbacks is set,
1726 * it may be called from a different thread, but not from more than one at
1727 * once. Does not need to be reentrant.
1729 * @see release_buffer(), reget_buffer()
1730 * @see avcodec_align_dimensions2()
1734 * Decoders request a buffer of a particular size by setting
1735 * AVFrame.nb_samples prior to calling get_buffer(). The decoder may,
1736 * however, utilize only part of the buffer by setting AVFrame.nb_samples
1737 * to a smaller value in the output frame.
1739 * Decoders cannot use the buffer after returning from
1740 * avcodec_decode_audio4(), so they will not call release_buffer(), as it
1741 * is assumed to be released immediately upon return.
1743 * As a convenience, av_samples_get_buffer_size() and
1744 * av_samples_fill_arrays() in libavutil may be used by custom get_buffer()
1745 * functions to find the required data size and to fill data pointers and
1746 * linesize. In AVFrame.linesize, only linesize[0] may be set for audio
1747 * since all planes must be the same size.
1749 * @see av_samples_get_buffer_size(), av_samples_fill_arrays()
1751 * - encoding: unused
1752 * - decoding: Set by libavcodec, user can override.
1754 int (*get_buffer)(struct AVCodecContext *c, AVFrame *pic);
1757 * Called to release buffers which were allocated with get_buffer.
1758 * A released buffer can be reused in get_buffer().
1759 * pic.data[*] must be set to NULL.
1760 * May be called from a different thread if frame multithreading is used,
1761 * but not by more than one thread at once, so does not need to be reentrant.
1762 * - encoding: unused
1763 * - decoding: Set by libavcodec, user can override.
1765 void (*release_buffer)(struct AVCodecContext *c, AVFrame *pic);
1768 * Size of the frame reordering buffer in the decoder.
1769 * For MPEG-2 it is 1 IPB or 0 low delay IP.
1770 * - encoding: Set by libavcodec.
1771 * - decoding: Set by libavcodec.
1776 * number of bytes per packet if constant and known or 0
1777 * Used by some WAV based audio codecs.
1781 #if FF_API_PARSE_FRAME
1783 * If true, only parsing is done. The frame data is returned.
1784 * Only MPEG audio decoders support this now.
1785 * - encoding: unused
1786 * - decoding: Set by user
1788 attribute_deprecated int parse_only;
1792 * 0-> h263 quant 1-> mpeg quant
1793 * - encoding: Set by user.
1794 * - decoding: unused
1799 * pass1 encoding statistics output buffer
1800 * - encoding: Set by libavcodec.
1801 * - decoding: unused
1806 * pass2 encoding statistics input buffer
1807 * Concatenated stuff from stats_out of pass1 should be placed here.
1808 * - encoding: Allocated/set/freed by user.
1809 * - decoding: unused
1814 * ratecontrol qmin qmax limiting method
1815 * 0-> clipping, 1-> use a nice continous function to limit qscale wthin qmin/qmax.
1816 * - encoding: Set by user.
1817 * - decoding: unused
1825 * ratecontrol override, see RcOverride
1826 * - encoding: Allocated/set/freed by user.
1827 * - decoding: unused
1829 RcOverride *rc_override;
1830 int rc_override_count;
1833 * rate control equation
1834 * - encoding: Set by user
1835 * - decoding: unused
1841 * - encoding: Set by user.
1842 * - decoding: unused
1848 * - encoding: Set by user.
1849 * - decoding: unused
1854 * decoder bitstream buffer size
1855 * - encoding: Set by user.
1856 * - decoding: unused
1859 float rc_buffer_aggressivity;
1862 * qscale factor between P and I-frames
1863 * If > 0 then the last p frame quantizer will be used (q= lastp_q*factor+offset).
1864 * If < 0 then normal ratecontrol will be done (q= -normal_q*factor+offset).
1865 * - encoding: Set by user.
1866 * - decoding: unused
1868 float i_quant_factor;
1871 * qscale offset between P and I-frames
1872 * - encoding: Set by user.
1873 * - decoding: unused
1875 float i_quant_offset;
1878 * initial complexity for pass1 ratecontrol
1879 * - encoding: Set by user.
1880 * - decoding: unused
1882 float rc_initial_cplx;
1885 * DCT algorithm, see FF_DCT_* below
1886 * - encoding: Set by user.
1887 * - decoding: unused
1890 #define FF_DCT_AUTO 0
1891 #define FF_DCT_FASTINT 1
1892 #define FF_DCT_INT 2
1893 #define FF_DCT_MMX 3
1894 #define FF_DCT_MLIB 4
1895 #define FF_DCT_ALTIVEC 5
1896 #define FF_DCT_FAAN 6
1899 * luminance masking (0-> disabled)
1900 * - encoding: Set by user.
1901 * - decoding: unused
1906 * temporary complexity masking (0-> disabled)
1907 * - encoding: Set by user.
1908 * - decoding: unused
1910 float temporal_cplx_masking;
1913 * spatial complexity masking (0-> disabled)
1914 * - encoding: Set by user.
1915 * - decoding: unused
1917 float spatial_cplx_masking;
1920 * p block masking (0-> disabled)
1921 * - encoding: Set by user.
1922 * - decoding: unused
1927 * darkness masking (0-> disabled)
1928 * - encoding: Set by user.
1929 * - decoding: unused
1934 * IDCT algorithm, see FF_IDCT_* below.
1935 * - encoding: Set by user.
1936 * - decoding: Set by user.
1939 #define FF_IDCT_AUTO 0
1940 #define FF_IDCT_INT 1
1941 #define FF_IDCT_SIMPLE 2
1942 #define FF_IDCT_SIMPLEMMX 3
1943 #define FF_IDCT_LIBMPEG2MMX 4
1944 #define FF_IDCT_PS2 5
1945 #define FF_IDCT_MLIB 6
1946 #define FF_IDCT_ARM 7
1947 #define FF_IDCT_ALTIVEC 8
1948 #define FF_IDCT_SH4 9
1949 #define FF_IDCT_SIMPLEARM 10
1950 #define FF_IDCT_H264 11
1951 #define FF_IDCT_VP3 12
1952 #define FF_IDCT_IPP 13
1953 #define FF_IDCT_XVIDMMX 14
1954 #define FF_IDCT_CAVS 15
1955 #define FF_IDCT_SIMPLEARMV5TE 16
1956 #define FF_IDCT_SIMPLEARMV6 17
1957 #define FF_IDCT_SIMPLEVIS 18
1958 #define FF_IDCT_WMV2 19
1959 #define FF_IDCT_FAAN 20
1960 #define FF_IDCT_EA 21
1961 #define FF_IDCT_SIMPLENEON 22
1962 #define FF_IDCT_SIMPLEALPHA 23
1963 #define FF_IDCT_BINK 24
1967 * - encoding: Set by libavcodec.
1968 * - decoding: Set by user (or 0).
1972 * slice offsets in the frame in bytes
1973 * - encoding: Set/allocated by libavcodec.
1974 * - decoding: Set/allocated by user (or NULL).
1979 * error concealment flags
1980 * - encoding: unused
1981 * - decoding: Set by user.
1983 int error_concealment;
1984 #define FF_EC_GUESS_MVS 1
1985 #define FF_EC_DEBLOCK 2
1988 * dsp_mask could be add used to disable unwanted CPU features
1989 * CPU features (i.e. MMX, SSE. ...)
1991 * With the FORCE flag you may instead enable given CPU features.
1992 * (Dangerous: Usable in case of misdetection, improper usage however will
1993 * result into program crash.)
1998 * bits per sample/pixel from the demuxer (needed for huffyuv).
1999 * - encoding: Set by libavcodec.
2000 * - decoding: Set by user.
2002 int bits_per_coded_sample;
2005 * prediction method (needed for huffyuv)
2006 * - encoding: Set by user.
2007 * - decoding: unused
2009 int prediction_method;
2010 #define FF_PRED_LEFT 0
2011 #define FF_PRED_PLANE 1
2012 #define FF_PRED_MEDIAN 2
2015 * sample aspect ratio (0 if unknown)
2016 * That is the width of a pixel divided by the height of the pixel.
2017 * Numerator and denominator must be relatively prime and smaller than 256 for some video standards.
2018 * - encoding: Set by user.
2019 * - decoding: Set by libavcodec.
2021 AVRational sample_aspect_ratio;
2024 * the picture in the bitstream
2025 * - encoding: Set by libavcodec.
2026 * - decoding: Set by libavcodec.
2028 AVFrame *coded_frame;
2032 * - encoding: Set by user.
2033 * - decoding: Set by user.
2036 #define FF_DEBUG_PICT_INFO 1
2037 #define FF_DEBUG_RC 2
2038 #define FF_DEBUG_BITSTREAM 4
2039 #define FF_DEBUG_MB_TYPE 8
2040 #define FF_DEBUG_QP 16
2041 #define FF_DEBUG_MV 32
2042 #define FF_DEBUG_DCT_COEFF 0x00000040
2043 #define FF_DEBUG_SKIP 0x00000080
2044 #define FF_DEBUG_STARTCODE 0x00000100
2045 #define FF_DEBUG_PTS 0x00000200
2046 #define FF_DEBUG_ER 0x00000400
2047 #define FF_DEBUG_MMCO 0x00000800
2048 #define FF_DEBUG_BUGS 0x00001000
2049 #define FF_DEBUG_VIS_QP 0x00002000
2050 #define FF_DEBUG_VIS_MB_TYPE 0x00004000
2051 #define FF_DEBUG_BUFFERS 0x00008000
2052 #define FF_DEBUG_THREADS 0x00010000
2056 * - encoding: Set by user.
2057 * - decoding: Set by user.
2060 #define FF_DEBUG_VIS_MV_P_FOR 0x00000001 //visualize forward predicted MVs of P frames
2061 #define FF_DEBUG_VIS_MV_B_FOR 0x00000002 //visualize forward predicted MVs of B frames
2062 #define FF_DEBUG_VIS_MV_B_BACK 0x00000004 //visualize backward predicted MVs of B frames
2066 * - encoding: Set by libavcodec if flags&CODEC_FLAG_PSNR.
2067 * - decoding: unused
2069 uint64_t error[AV_NUM_DATA_POINTERS];
2072 * motion estimation comparison function
2073 * - encoding: Set by user.
2074 * - decoding: unused
2078 * subpixel motion estimation comparison function
2079 * - encoding: Set by user.
2080 * - decoding: unused
2084 * macroblock comparison function (not supported yet)
2085 * - encoding: Set by user.
2086 * - decoding: unused
2090 * interlaced DCT comparison function
2091 * - encoding: Set by user.
2092 * - decoding: unused
2095 #define FF_CMP_SAD 0
2096 #define FF_CMP_SSE 1
2097 #define FF_CMP_SATD 2
2098 #define FF_CMP_DCT 3
2099 #define FF_CMP_PSNR 4
2100 #define FF_CMP_BIT 5
2102 #define FF_CMP_ZERO 7
2103 #define FF_CMP_VSAD 8
2104 #define FF_CMP_VSSE 9
2105 #define FF_CMP_NSSE 10
2106 #define FF_CMP_W53 11
2107 #define FF_CMP_W97 12
2108 #define FF_CMP_DCTMAX 13
2109 #define FF_CMP_DCT264 14
2110 #define FF_CMP_CHROMA 256
2113 * ME diamond size & shape
2114 * - encoding: Set by user.
2115 * - decoding: unused
2120 * amount of previous MV predictors (2a+1 x 2a+1 square)
2121 * - encoding: Set by user.
2122 * - decoding: unused
2124 int last_predictor_count;
2127 * prepass for motion estimation
2128 * - encoding: Set by user.
2129 * - decoding: unused
2134 * motion estimation prepass comparison function
2135 * - encoding: Set by user.
2136 * - decoding: unused
2141 * ME prepass diamond size & shape
2142 * - encoding: Set by user.
2143 * - decoding: unused
2149 * - encoding: Set by user.
2150 * - decoding: unused
2152 int me_subpel_quality;
2155 * callback to negotiate the pixelFormat
2156 * @param fmt is the list of formats which are supported by the codec,
2157 * it is terminated by -1 as 0 is a valid format, the formats are ordered by quality.
2158 * The first is always the native one.
2159 * @return the chosen format
2160 * - encoding: unused
2161 * - decoding: Set by user, if not set the native format will be chosen.
2163 enum PixelFormat (*get_format)(struct AVCodecContext *s, const enum PixelFormat * fmt);
2166 * DTG active format information (additional aspect ratio
2167 * information only used in DVB MPEG-2 transport streams)
2170 * - encoding: unused
2171 * - decoding: Set by decoder.
2173 int dtg_active_format;
2174 #define FF_DTG_AFD_SAME 8
2175 #define FF_DTG_AFD_4_3 9
2176 #define FF_DTG_AFD_16_9 10
2177 #define FF_DTG_AFD_14_9 11
2178 #define FF_DTG_AFD_4_3_SP_14_9 13
2179 #define FF_DTG_AFD_16_9_SP_14_9 14
2180 #define FF_DTG_AFD_SP_4_3 15
2183 * maximum motion estimation search range in subpel units
2184 * If 0 then no limit.
2186 * - encoding: Set by user.
2187 * - decoding: unused
2192 * intra quantizer bias
2193 * - encoding: Set by user.
2194 * - decoding: unused
2196 int intra_quant_bias;
2197 #define FF_DEFAULT_QUANT_BIAS 999999
2200 * inter quantizer bias
2201 * - encoding: Set by user.
2202 * - decoding: unused
2204 int inter_quant_bias;
2208 * - encoding: unused
2209 * - decoding: Which clrtable should be used for 8bit RGB images.
2210 * Tables have to be stored somewhere. FIXME
2214 #if FF_API_INTERNAL_CONTEXT
2216 * internal_buffer count
2217 * Don't touch, used by libavcodec default_get_buffer().
2218 * @deprecated this field was moved to an internal context
2220 attribute_deprecated int internal_buffer_count;
2224 * Don't touch, used by libavcodec default_get_buffer().
2225 * @deprecated this field was moved to an internal context
2227 attribute_deprecated void *internal_buffer;
2231 * Global quality for codecs which cannot change it per frame.
2232 * This should be proportional to MPEG-1/2/4 qscale.
2233 * - encoding: Set by user.
2234 * - decoding: unused
2238 #define FF_CODER_TYPE_VLC 0
2239 #define FF_CODER_TYPE_AC 1
2240 #define FF_CODER_TYPE_RAW 2
2241 #define FF_CODER_TYPE_RLE 3
2242 #define FF_CODER_TYPE_DEFLATE 4
2245 * - encoding: Set by user.
2246 * - decoding: unused
2252 * - encoding: Set by user.
2253 * - decoding: unused
2259 * - encoding: unused
2260 * - decoding: Set by user.
2262 uint8_t * (*realloc)(struct AVCodecContext *s, uint8_t *buf, int buf_size);
2267 * - encoding: unused
2268 * - decoding: Set by user.
2271 #define SLICE_FLAG_CODED_ORDER 0x0001 ///< draw_horiz_band() is called in coded order instead of display
2272 #define SLICE_FLAG_ALLOW_FIELD 0x0002 ///< allow draw_horiz_band() with field slices (MPEG2 field pics)
2273 #define SLICE_FLAG_ALLOW_PLANE 0x0004 ///< allow draw_horiz_band() with 1 component at a time (SVQ1)
2276 * XVideo Motion Acceleration
2277 * - encoding: forbidden
2278 * - decoding: set by decoder
2280 int xvmc_acceleration;
2283 * macroblock decision mode
2284 * - encoding: Set by user.
2285 * - decoding: unused
2288 #define FF_MB_DECISION_SIMPLE 0 ///< uses mb_cmp
2289 #define FF_MB_DECISION_BITS 1 ///< chooses the one which needs the fewest bits
2290 #define FF_MB_DECISION_RD 2 ///< rate distortion
2293 * custom intra quantization matrix
2294 * - encoding: Set by user, can be NULL.
2295 * - decoding: Set by libavcodec.
2297 uint16_t *intra_matrix;
2300 * custom inter quantization matrix
2301 * - encoding: Set by user, can be NULL.
2302 * - decoding: Set by libavcodec.
2304 uint16_t *inter_matrix;
2307 * fourcc from the AVI stream header (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A').
2308 * This is used to work around some encoder bugs.
2309 * - encoding: unused
2310 * - decoding: Set by user, will be converted to uppercase by libavcodec during init.
2312 unsigned int stream_codec_tag;
2315 * scene change detection threshold
2316 * 0 is default, larger means fewer detected scene changes.
2317 * - encoding: Set by user.
2318 * - decoding: unused
2320 int scenechange_threshold;
2323 * minimum Lagrange multipler
2324 * - encoding: Set by user.
2325 * - decoding: unused
2330 * maximum Lagrange multipler
2331 * - encoding: Set by user.
2332 * - decoding: unused
2336 #if FF_API_PALETTE_CONTROL
2338 * palette control structure
2339 * - encoding: ??? (no palette-enabled encoder yet)
2340 * - decoding: Set by user.
2342 struct AVPaletteControl *palctrl;
2346 * noise reduction strength
2347 * - encoding: Set by user.
2348 * - decoding: unused
2350 int noise_reduction;
2353 * Called at the beginning of a frame to get cr buffer for it.
2354 * Buffer type (size, hints) must be the same. libavcodec won't check it.
2355 * libavcodec will pass previous buffer in pic, function should return
2356 * same buffer or new buffer with old frame "painted" into it.
2357 * If pic.data[0] == NULL must behave like get_buffer().
2358 * if CODEC_CAP_DR1 is not set then reget_buffer() must call
2359 * avcodec_default_reget_buffer() instead of providing buffers allocated by
2361 * - encoding: unused
2362 * - decoding: Set by libavcodec, user can override.
2364 int (*reget_buffer)(struct AVCodecContext *c, AVFrame *pic);
2367 * Number of bits which should be loaded into the rc buffer before decoding starts.
2368 * - encoding: Set by user.
2369 * - decoding: unused
2371 int rc_initial_buffer_occupancy;
2375 * - encoding: Set by user.
2376 * - decoding: unused
2378 int inter_threshold;
2382 * - encoding: Set by user.
2383 * - decoding: Set by user.
2388 * Simulates errors in the bitstream to test error concealment.
2389 * - encoding: Set by user.
2390 * - decoding: unused
2394 #if FF_API_ANTIALIAS_ALGO
2396 * MP3 antialias algorithm, see FF_AA_* below.
2397 * - encoding: unused
2398 * - decoding: Set by user.
2400 attribute_deprecated int antialias_algo;
2401 #define FF_AA_AUTO 0
2402 #define FF_AA_FASTINT 1 //not implemented yet
2404 #define FF_AA_FLOAT 3
2408 * quantizer noise shaping
2409 * - encoding: Set by user.
2410 * - decoding: unused
2412 int quantizer_noise_shaping;
2416 * is used to decide how many independent tasks should be passed to execute()
2417 * - encoding: Set by user.
2418 * - decoding: Set by user.
2423 * The codec may call this to execute several independent things.
2424 * It will return only after finishing all tasks.
2425 * The user may replace this with some multithreaded implementation,
2426 * the default implementation will execute the parts serially.
2427 * @param count the number of things to execute
2428 * - encoding: Set by libavcodec, user can override.
2429 * - decoding: Set by libavcodec, user can override.
2431 int (*execute)(struct AVCodecContext *c, int (*func)(struct AVCodecContext *c2, void *arg), void *arg2, int *ret, int count, int size);
2435 * Can be used by execute() to store some per AVCodecContext stuff.
2436 * - encoding: set by execute()
2437 * - decoding: set by execute()
2439 void *thread_opaque;
2442 * Motion estimation threshold below which no motion estimation is
2443 * performed, but instead the user specified motion vectors are used.
2445 * - encoding: Set by user.
2446 * - decoding: unused
2451 * Macroblock threshold below which the user specified macroblock types will be used.
2452 * - encoding: Set by user.
2453 * - decoding: unused
2458 * precision of the intra DC coefficient - 8
2459 * - encoding: Set by user.
2460 * - decoding: unused
2462 int intra_dc_precision;
2465 * noise vs. sse weight for the nsse comparsion function
2466 * - encoding: Set by user.
2467 * - decoding: unused
2472 * Number of macroblock rows at the top which are skipped.
2473 * - encoding: unused
2474 * - decoding: Set by user.
2479 * Number of macroblock rows at the bottom which are skipped.
2480 * - encoding: unused
2481 * - decoding: Set by user.
2487 * - encoding: Set by user.
2488 * - decoding: Set by libavcodec.
2491 #define FF_PROFILE_UNKNOWN -99
2492 #define FF_PROFILE_RESERVED -100
2494 #define FF_PROFILE_AAC_MAIN 0
2495 #define FF_PROFILE_AAC_LOW 1
2496 #define FF_PROFILE_AAC_SSR 2
2497 #define FF_PROFILE_AAC_LTP 3
2499 #define FF_PROFILE_DTS 20
2500 #define FF_PROFILE_DTS_ES 30
2501 #define FF_PROFILE_DTS_96_24 40
2502 #define FF_PROFILE_DTS_HD_HRA 50
2503 #define FF_PROFILE_DTS_HD_MA 60
2505 #define FF_PROFILE_MPEG2_422 0
2506 #define FF_PROFILE_MPEG2_HIGH 1
2507 #define FF_PROFILE_MPEG2_SS 2
2508 #define FF_PROFILE_MPEG2_SNR_SCALABLE 3
2509 #define FF_PROFILE_MPEG2_MAIN 4
2510 #define FF_PROFILE_MPEG2_SIMPLE 5
2512 #define FF_PROFILE_H264_CONSTRAINED (1<<9) // 8+1; constraint_set1_flag
2513 #define FF_PROFILE_H264_INTRA (1<<11) // 8+3; constraint_set3_flag
2515 #define FF_PROFILE_H264_BASELINE 66
2516 #define FF_PROFILE_H264_CONSTRAINED_BASELINE (66|FF_PROFILE_H264_CONSTRAINED)
2517 #define FF_PROFILE_H264_MAIN 77
2518 #define FF_PROFILE_H264_EXTENDED 88
2519 #define FF_PROFILE_H264_HIGH 100
2520 #define FF_PROFILE_H264_HIGH_10 110
2521 #define FF_PROFILE_H264_HIGH_10_INTRA (110|FF_PROFILE_H264_INTRA)
2522 #define FF_PROFILE_H264_HIGH_422 122
2523 #define FF_PROFILE_H264_HIGH_422_INTRA (122|FF_PROFILE_H264_INTRA)
2524 #define FF_PROFILE_H264_HIGH_444 144
2525 #define FF_PROFILE_H264_HIGH_444_PREDICTIVE 244
2526 #define FF_PROFILE_H264_HIGH_444_INTRA (244|FF_PROFILE_H264_INTRA)
2527 #define FF_PROFILE_H264_CAVLC_444 44
2529 #define FF_PROFILE_VC1_SIMPLE 0
2530 #define FF_PROFILE_VC1_MAIN 1
2531 #define FF_PROFILE_VC1_COMPLEX 2
2532 #define FF_PROFILE_VC1_ADVANCED 3
2534 #define FF_PROFILE_MPEG4_SIMPLE 0
2535 #define FF_PROFILE_MPEG4_SIMPLE_SCALABLE 1
2536 #define FF_PROFILE_MPEG4_CORE 2
2537 #define FF_PROFILE_MPEG4_MAIN 3
2538 #define FF_PROFILE_MPEG4_N_BIT 4
2539 #define FF_PROFILE_MPEG4_SCALABLE_TEXTURE 5
2540 #define FF_PROFILE_MPEG4_SIMPLE_FACE_ANIMATION 6
2541 #define FF_PROFILE_MPEG4_BASIC_ANIMATED_TEXTURE 7
2542 #define FF_PROFILE_MPEG4_HYBRID 8
2543 #define FF_PROFILE_MPEG4_ADVANCED_REAL_TIME 9
2544 #define FF_PROFILE_MPEG4_CORE_SCALABLE 10
2545 #define FF_PROFILE_MPEG4_ADVANCED_CODING 11
2546 #define FF_PROFILE_MPEG4_ADVANCED_CORE 12
2547 #define FF_PROFILE_MPEG4_ADVANCED_SCALABLE_TEXTURE 13
2548 #define FF_PROFILE_MPEG4_SIMPLE_STUDIO 14
2549 #define FF_PROFILE_MPEG4_ADVANCED_SIMPLE 15
2553 * - encoding: Set by user.
2554 * - decoding: Set by libavcodec.
2557 #define FF_LEVEL_UNKNOWN -99
2560 * low resolution decoding, 1-> 1/2 size, 2->1/4 size
2561 * - encoding: unused
2562 * - decoding: Set by user.
2567 * Bitstream width / height, may be different from width/height if lowres enabled.
2568 * - encoding: unused
2569 * - decoding: Set by user before init if known. Codec should override / dynamically change if needed.
2571 int coded_width, coded_height;
2574 * frame skip threshold
2575 * - encoding: Set by user.
2576 * - decoding: unused
2578 int frame_skip_threshold;
2582 * - encoding: Set by user.
2583 * - decoding: unused
2585 int frame_skip_factor;
2588 * frame skip exponent
2589 * - encoding: Set by user.
2590 * - decoding: unused
2595 * frame skip comparison function
2596 * - encoding: Set by user.
2597 * - decoding: unused
2602 * Border processing masking, raises the quantizer for mbs on the borders
2604 * - encoding: Set by user.
2605 * - decoding: unused
2607 float border_masking;
2610 * minimum MB lagrange multipler
2611 * - encoding: Set by user.
2612 * - decoding: unused
2617 * maximum MB lagrange multipler
2618 * - encoding: Set by user.
2619 * - decoding: unused
2625 * - encoding: Set by user.
2626 * - decoding: unused
2628 int me_penalty_compensation;
2632 * - encoding: unused
2633 * - decoding: Set by user.
2635 enum AVDiscard skip_loop_filter;
2639 * - encoding: unused
2640 * - decoding: Set by user.
2642 enum AVDiscard skip_idct;
2646 * - encoding: unused
2647 * - decoding: Set by user.
2649 enum AVDiscard skip_frame;
2653 * - encoding: Set by user.
2654 * - decoding: unused
2660 * - encoding: Set by user.
2661 * - decoding: unused
2665 #if FF_API_X264_GLOBAL_OPTS
2667 * constant rate factor - quality-based VBR - values ~correspond to qps
2668 * - encoding: Set by user.
2669 * - decoding: unused
2670 * @deprecated use 'crf' libx264 private option
2672 attribute_deprecated float crf;
2675 * constant quantization parameter rate control method
2676 * - encoding: Set by user.
2677 * - decoding: unused
2678 * @deprecated use 'cqp' libx264 private option
2680 attribute_deprecated int cqp;
2685 * - encoding: Set by user.
2686 * - decoding: unused
2691 * number of reference frames
2692 * - encoding: Set by user.
2693 * - decoding: Set by lavc.
2698 * chroma qp offset from luma
2699 * - encoding: Set by user.
2700 * - decoding: unused
2704 #if FF_API_X264_GLOBAL_OPTS
2706 * Influence how often B-frames are used.
2707 * - encoding: Set by user.
2708 * - decoding: unused
2710 attribute_deprecated int bframebias;
2714 * trellis RD quantization
2715 * - encoding: Set by user.
2716 * - decoding: unused
2720 #if FF_API_X264_GLOBAL_OPTS
2722 * Reduce fluctuations in qp (before curve compression).
2723 * - encoding: Set by user.
2724 * - decoding: unused
2726 attribute_deprecated float complexityblur;
2729 * in-loop deblocking filter alphac0 parameter
2730 * alpha is in the range -6...6
2731 * - encoding: Set by user.
2732 * - decoding: unused
2734 attribute_deprecated int deblockalpha;
2737 * in-loop deblocking filter beta parameter
2738 * beta is in the range -6...6
2739 * - encoding: Set by user.
2740 * - decoding: unused
2742 attribute_deprecated int deblockbeta;
2745 * macroblock subpartition sizes to consider - p8x8, p4x4, b8x8, i8x8, i4x4
2746 * - encoding: Set by user.
2747 * - decoding: unused
2749 attribute_deprecated int partitions;
2750 #define X264_PART_I4X4 0x001 /* Analyze i4x4 */
2751 #define X264_PART_I8X8 0x002 /* Analyze i8x8 (requires 8x8 transform) */
2752 #define X264_PART_P8X8 0x010 /* Analyze p16x8, p8x16 and p8x8 */
2753 #define X264_PART_P4X4 0x020 /* Analyze p8x4, p4x8, p4x4 */
2754 #define X264_PART_B8X8 0x100 /* Analyze b16x8, b8x16 and b8x8 */
2757 * direct MV prediction mode - 0 (none), 1 (spatial), 2 (temporal), 3 (auto)
2758 * - encoding: Set by user.
2759 * - decoding: unused
2761 attribute_deprecated int directpred;
2765 * Audio cutoff bandwidth (0 means "automatic")
2766 * - encoding: Set by user.
2767 * - decoding: unused
2772 * Multiplied by qscale for each frame and added to scene_change_score.
2773 * - encoding: Set by user.
2774 * - decoding: unused
2776 int scenechange_factor;
2780 * Note: Value depends upon the compare function used for fullpel ME.
2781 * - encoding: Set by user.
2782 * - decoding: unused
2787 * Adjust sensitivity of b_frame_strategy 1.
2788 * - encoding: Set by user.
2789 * - decoding: unused
2794 * - encoding: Set by user.
2795 * - decoding: unused
2797 int compression_level;
2798 #define FF_COMPRESSION_DEFAULT -1
2801 * - encoding: Set by user.
2802 * - decoding: unused
2804 int min_prediction_order;
2807 * - encoding: Set by user.
2808 * - decoding: unused
2810 int max_prediction_order;
2812 #if FF_API_FLAC_GLOBAL_OPTS
2814 * @name FLAC options
2815 * @deprecated Use FLAC encoder private options instead.
2820 * LPC coefficient precision - used by FLAC encoder
2821 * - encoding: Set by user.
2822 * - decoding: unused
2824 attribute_deprecated int lpc_coeff_precision;
2827 * search method for selecting prediction order
2828 * - encoding: Set by user.
2829 * - decoding: unused
2831 attribute_deprecated int prediction_order_method;
2834 * - encoding: Set by user.
2835 * - decoding: unused
2837 attribute_deprecated int min_partition_order;
2840 * - encoding: Set by user.
2841 * - decoding: unused
2843 attribute_deprecated int max_partition_order;
2850 * GOP timecode frame start number
2851 * - encoding: Set by user, in non drop frame format
2852 * - decoding: Set by libavcodec (timecode in the 25 bits format, -1 if unset)
2854 int64_t timecode_frame_start;
2856 #if FF_API_REQUEST_CHANNELS
2858 * Decoder should decode to this many channels if it can (0 for default)
2859 * - encoding: unused
2860 * - decoding: Set by user.
2861 * @deprecated Deprecated in favor of request_channel_layout.
2863 int request_channels;
2866 #if FF_API_DRC_SCALE
2868 * Percentage of dynamic range compression to be applied by the decoder.
2869 * The default value is 1.0, corresponding to full compression.
2870 * - encoding: unused
2871 * - decoding: Set by user.
2872 * @deprecated use AC3 decoder private option instead.
2874 attribute_deprecated float drc_scale;
2878 * opaque 64bit number (generally a PTS) that will be reordered and
2879 * output in AVFrame.reordered_opaque
2880 * @deprecated in favor of pkt_pts
2881 * - encoding: unused
2882 * - decoding: Set by user.
2884 int64_t reordered_opaque;
2887 * Bits per sample/pixel of internal libavcodec pixel/sample format.
2888 * - encoding: set by user.
2889 * - decoding: set by libavcodec.
2891 int bits_per_raw_sample;
2894 * Audio channel layout.
2895 * - encoding: set by user.
2896 * - decoding: set by user, may be overwritten by libavcodec.
2898 uint64_t channel_layout;
2901 * Request decoder to use this channel layout if it can (0 for default)
2902 * - encoding: unused
2903 * - decoding: Set by user.
2905 uint64_t request_channel_layout;
2908 * Ratecontrol attempt to use, at maximum, <value> of what can be used without an underflow.
2909 * - encoding: Set by user.
2910 * - decoding: unused.
2912 float rc_max_available_vbv_use;
2915 * Ratecontrol attempt to use, at least, <value> times the amount needed to prevent a vbv overflow.
2916 * - encoding: Set by user.
2917 * - decoding: unused.
2919 float rc_min_vbv_overflow_use;
2922 * Hardware accelerator in use
2923 * - encoding: unused.
2924 * - decoding: Set by libavcodec
2926 struct AVHWAccel *hwaccel;
2929 * For some codecs, the time base is closer to the field rate than the frame rate.
2930 * Most notably, H.264 and MPEG-2 specify time_base as half of frame duration
2931 * if no telecine is used ...
2933 * Set to time_base ticks per frame. Default 1, e.g., H.264/MPEG-2 set it to 2.
2935 int ticks_per_frame;
2938 * Hardware accelerator context.
2939 * For some hardware accelerators, a global context needs to be
2940 * provided by the user. In that case, this holds display-dependent
2941 * data FFmpeg cannot instantiate itself. Please refer to the
2942 * FFmpeg HW accelerator documentation to know how to fill this
2943 * is. e.g. for VA API, this is a struct vaapi_context.
2944 * - encoding: unused
2945 * - decoding: Set by user
2947 void *hwaccel_context;
2950 * Chromaticity coordinates of the source primaries.
2951 * - encoding: Set by user
2952 * - decoding: Set by libavcodec
2954 enum AVColorPrimaries color_primaries;
2957 * Color Transfer Characteristic.
2958 * - encoding: Set by user
2959 * - decoding: Set by libavcodec
2961 enum AVColorTransferCharacteristic color_trc;
2964 * YUV colorspace type.
2965 * - encoding: Set by user
2966 * - decoding: Set by libavcodec
2968 enum AVColorSpace colorspace;
2971 * MPEG vs JPEG YUV range.
2972 * - encoding: Set by user
2973 * - decoding: Set by libavcodec
2975 enum AVColorRange color_range;
2978 * This defines the location of chroma samples.
2979 * - encoding: Set by user
2980 * - decoding: Set by libavcodec
2982 enum AVChromaLocation chroma_sample_location;
2985 * The codec may call this to execute several independent things.
2986 * It will return only after finishing all tasks.
2987 * The user may replace this with some multithreaded implementation,
2988 * the default implementation will execute the parts serially.
2989 * Also see avcodec_thread_init and e.g. the --enable-pthread configure option.
2990 * @param c context passed also to func
2991 * @param count the number of things to execute
2992 * @param arg2 argument passed unchanged to func
2993 * @param ret return values of executed functions, must have space for "count" values. May be NULL.
2994 * @param func function that will be called count times, with jobnr from 0 to count-1.
2995 * threadnr will be in the range 0 to c->thread_count-1 < MAX_THREADS and so that no
2996 * two instances of func executing at the same time will have the same threadnr.
2997 * @return always 0 currently, but code should handle a future improvement where when any call to func
2998 * returns < 0 no further calls to func may be done and < 0 is returned.
2999 * - encoding: Set by libavcodec, user can override.
3000 * - decoding: Set by libavcodec, user can override.
3002 int (*execute2)(struct AVCodecContext *c, int (*func)(struct AVCodecContext *c2, void *arg, int jobnr, int threadnr), void *arg2, int *ret, int count);
3004 #if FF_API_X264_GLOBAL_OPTS
3006 * explicit P-frame weighted prediction analysis method
3008 * 1: fast blind weighting (one reference duplicate with -1 offset)
3009 * 2: smart weighting (full fade detection analysis)
3010 * - encoding: Set by user.
3011 * - decoding: unused
3013 attribute_deprecated int weighted_p_pred;
3018 * 1: Variance AQ (complexity mask)
3019 * 2: Auto-variance AQ (experimental)
3020 * - encoding: Set by user
3021 * - decoding: unused
3023 attribute_deprecated int aq_mode;
3027 * Reduces blocking and blurring in flat and textured areas.
3028 * - encoding: Set by user
3029 * - decoding: unused
3031 attribute_deprecated float aq_strength;
3035 * Strength of psychovisual optimization
3036 * - encoding: Set by user
3037 * - decoding: unused
3039 attribute_deprecated float psy_rd;
3043 * Strength of psychovisual optimization
3044 * - encoding: Set by user
3045 * - decoding: unused
3047 attribute_deprecated float psy_trellis;
3051 * Number of frames for frametype and ratecontrol lookahead
3052 * - encoding: Set by user
3053 * - decoding: unused
3055 attribute_deprecated int rc_lookahead;
3058 * Constant rate factor maximum
3059 * With CRF encoding mode and VBV restrictions enabled, prevents quality from being worse
3060 * than crf_max, even if doing so would violate VBV restrictions.
3061 * - encoding: Set by user.
3062 * - decoding: unused
3064 attribute_deprecated float crf_max;
3067 int log_level_offset;
3069 #if FF_API_FLAC_GLOBAL_OPTS
3071 * Determine which LPC analysis algorithm to use.
3072 * - encoding: Set by user
3073 * - decoding: unused
3075 attribute_deprecated enum AVLPCType lpc_type;
3078 * Number of passes to use for Cholesky factorization during LPC analysis
3079 * - encoding: Set by user
3080 * - decoding: unused
3082 attribute_deprecated int lpc_passes;
3087 * Indicates number of picture subdivisions. Used for parallelized
3089 * - encoding: Set by user
3090 * - decoding: unused
3095 * Header containing style information for text subtitles.
3096 * For SUBTITLE_ASS subtitle type, it should contain the whole ASS
3097 * [Script Info] and [V4+ Styles] section, plus the [Events] line and
3098 * the Format line following. It shouldn't include any Dialogue line.
3099 * - encoding: Set/allocated/freed by user (before avcodec_open2())
3100 * - decoding: Set/allocated/freed by libavcodec (by avcodec_open2())
3102 uint8_t *subtitle_header;
3103 int subtitle_header_size;
3106 * Current packet as passed into the decoder, to avoid having
3107 * to pass the packet into every function. Currently only valid
3108 * inside lavc and get/release_buffer callbacks.
3109 * - decoding: set by avcodec_decode_*, read by get_buffer() for setting pkt_pts
3110 * - encoding: unused
3114 #if FF_API_INTERNAL_CONTEXT
3116 * Whether this is a copy of the context which had init() called on it.
3117 * This is used by multithreading - shared tables and picture pointers
3118 * should be freed from the original context only.
3119 * - encoding: Set by libavcodec.
3120 * - decoding: Set by libavcodec.
3122 * @deprecated this field has been moved to an internal context
3124 attribute_deprecated int is_copy;
3128 * Which multithreading methods to use.
3129 * Use of FF_THREAD_FRAME will increase decoding delay by one frame per thread,
3130 * so clients which cannot provide future frames should not use it.
3132 * - encoding: Set by user, otherwise the default is used.
3133 * - decoding: Set by user, otherwise the default is used.
3136 #define FF_THREAD_FRAME 1 ///< Decode more than one frame at once
3137 #define FF_THREAD_SLICE 2 ///< Decode more than one part of a single frame at once
3140 * Which multithreading methods are in use by the codec.
3141 * - encoding: Set by libavcodec.
3142 * - decoding: Set by libavcodec.
3144 int active_thread_type;
3147 * Set by the client if its custom get_buffer() callback can be called
3148 * from another thread, which allows faster multithreaded decoding.
3149 * draw_horiz_band() will be called from other threads regardless of this setting.
3150 * Ignored if the default get_buffer() is used.
3151 * - encoding: Set by user.
3152 * - decoding: Set by user.
3154 int thread_safe_callbacks;
3157 * VBV delay coded in the last frame (in periods of a 27 MHz clock).
3158 * Used for compliant TS muxing.
3159 * - encoding: Set by libavcodec.
3160 * - decoding: unused.
3165 * Type of service that the audio stream conveys.
3166 * - encoding: Set by user.
3167 * - decoding: Set by libavcodec.
3169 enum AVAudioServiceType audio_service_type;
3172 * desired sample format
3173 * - encoding: Not used.
3174 * - decoding: Set by user.
3175 * Decoder will decode to this format if it can.
3177 enum AVSampleFormat request_sample_fmt;
3180 * Error recognition; may misdetect some more or less valid parts as errors.
3181 * - encoding: unused
3182 * - decoding: Set by user.
3184 int err_recognition;
3185 #define AV_EF_CRCCHECK (1<<0)
3186 #define AV_EF_BITSTREAM (1<<1)
3187 #define AV_EF_BUFFER (1<<2)
3188 #define AV_EF_EXPLODE (1<<3)
3190 #define AV_EF_CAREFUL (1<<16)
3191 #define AV_EF_COMPLIANT (1<<17)
3192 #define AV_EF_AGGRESSIVE (1<<18)
3195 * Private context used for internal data.
3197 * Unlike priv_data, this is not codec-specific. It is used in general
3198 * libavcodec functions.
3200 struct AVCodecInternal *internal;
3203 * - encoding: set by libavcodec
3204 * - decoding: Set by libavcodec
3206 enum AVFieldOrder field_order;
3209 * Current statistics for PTS correction.
3210 * - decoding: maintained and used by libavcodec, not intended to be used by user apps
3211 * - encoding: unused
3213 int64_t pts_correction_num_faulty_pts; /// Number of incorrect PTS values so far
3214 int64_t pts_correction_num_faulty_dts; /// Number of incorrect DTS values so far
3215 int64_t pts_correction_last_pts; /// PTS of the last frame
3216 int64_t pts_correction_last_dts; /// DTS of the last frame
3223 typedef struct AVProfile {
3225 const char *name; ///< short name for the profile
3228 typedef struct AVCodecDefault AVCodecDefault;
3233 typedef struct AVCodec {
3235 * Name of the codec implementation.
3236 * The name is globally unique among encoders and among decoders (but an
3237 * encoder and a decoder can share the same name).
3238 * This is the primary way to find a codec from the user perspective.
3241 enum AVMediaType type;
3244 int (*init)(AVCodecContext *);
3245 int (*encode)(AVCodecContext *, uint8_t *buf, int buf_size, void *data);
3246 int (*close)(AVCodecContext *);
3247 int (*decode)(AVCodecContext *, void *outdata, int *outdata_size, AVPacket *avpkt);
3249 * Codec capabilities.
3253 struct AVCodec *next;
3256 * Will be called when seeking
3258 void (*flush)(AVCodecContext *);
3259 const AVRational *supported_framerates; ///< array of supported framerates, or NULL if any, array is terminated by {0,0}
3260 const enum PixelFormat *pix_fmts; ///< array of supported pixel formats, or NULL if unknown, array is terminated by -1
3262 * Descriptive name for the codec, meant to be more human readable than name.
3263 * You should use the NULL_IF_CONFIG_SMALL() macro to define it.
3265 const char *long_name;
3266 const int *supported_samplerates; ///< array of supported audio samplerates, or NULL if unknown, array is terminated by 0
3267 const enum AVSampleFormat *sample_fmts; ///< array of supported sample formats, or NULL if unknown, array is terminated by -1
3268 const uint64_t *channel_layouts; ///< array of support channel layouts, or NULL if unknown. array is terminated by 0
3269 uint8_t max_lowres; ///< maximum value for lowres supported by the decoder
3270 const AVClass *priv_class; ///< AVClass for the private context
3271 const AVProfile *profiles; ///< array of recognized profiles, or NULL if unknown, array is terminated by {FF_PROFILE_UNKNOWN}
3274 * @name Frame-level threading support functions
3278 * If defined, called on thread contexts when they are created.
3279 * If the codec allocates writable tables in init(), re-allocate them here.
3280 * priv_data will be set to a copy of the original.
3282 int (*init_thread_copy)(AVCodecContext *);
3284 * Copy necessary context variables from a previous thread context to the current one.
3285 * If not defined, the next thread will start automatically; otherwise, the codec
3286 * must call ff_thread_finish_setup().
3288 * dst and src will (rarely) point to the same context, in which case memcpy should be skipped.
3290 int (*update_thread_context)(AVCodecContext *dst, const AVCodecContext *src);
3294 * Private codec-specific defaults.
3296 const AVCodecDefault *defaults;
3299 * Initialize codec static data, called from avcodec_register().
3301 void (*init_static_data)(struct AVCodec *codec);
3307 typedef struct AVHWAccel {
3309 * Name of the hardware accelerated codec.
3310 * The name is globally unique among encoders and among decoders (but an
3311 * encoder and a decoder can share the same name).
3316 * Type of codec implemented by the hardware accelerator.
3318 * See AVMEDIA_TYPE_xxx
3320 enum AVMediaType type;
3323 * Codec implemented by the hardware accelerator.
3330 * Supported pixel format.
3332 * Only hardware accelerated formats are supported here.
3334 enum PixelFormat pix_fmt;
3337 * Hardware accelerated codec capabilities.
3338 * see FF_HWACCEL_CODEC_CAP_*
3342 struct AVHWAccel *next;
3345 * Called at the beginning of each frame or field picture.
3347 * Meaningful frame information (codec specific) is guaranteed to
3348 * be parsed at this point. This function is mandatory.
3350 * Note that buf can be NULL along with buf_size set to 0.
3351 * Otherwise, this means the whole frame is available at this point.
3353 * @param avctx the codec context
3354 * @param buf the frame data buffer base
3355 * @param buf_size the size of the frame in bytes
3356 * @return zero if successful, a negative value otherwise
3358 int (*start_frame)(AVCodecContext *avctx, const uint8_t *buf, uint32_t buf_size);
3361 * Callback for each slice.
3363 * Meaningful slice information (codec specific) is guaranteed to
3364 * be parsed at this point. This function is mandatory.
3366 * @param avctx the codec context
3367 * @param buf the slice data buffer base
3368 * @param buf_size the size of the slice in bytes
3369 * @return zero if successful, a negative value otherwise
3371 int (*decode_slice)(AVCodecContext *avctx, const uint8_t *buf, uint32_t buf_size);
3374 * Called at the end of each frame or field picture.
3376 * The whole picture is parsed at this point and can now be sent
3377 * to the hardware accelerator. This function is mandatory.
3379 * @param avctx the codec context
3380 * @return zero if successful, a negative value otherwise
3382 int (*end_frame)(AVCodecContext *avctx);
3385 * Size of HW accelerator private data.
3387 * Private data is allocated with av_mallocz() before
3388 * AVCodecContext.get_buffer() and deallocated after
3389 * AVCodecContext.release_buffer().
3395 * four components are given, that's all.
3396 * the last component is alpha
3398 typedef struct AVPicture {
3399 uint8_t *data[AV_NUM_DATA_POINTERS];
3400 int linesize[AV_NUM_DATA_POINTERS]; ///< number of bytes per line
3403 #define AVPALETTE_SIZE 1024
3404 #define AVPALETTE_COUNT 256
3405 #if FF_API_PALETTE_CONTROL
3408 * This structure defines a method for communicating palette changes
3409 * between and demuxer and a decoder.
3411 * @deprecated Use AVPacket to send palette changes instead.
3412 * This is totally broken.
3414 typedef struct AVPaletteControl {
3416 /* Demuxer sets this to 1 to indicate the palette has changed;
3417 * decoder resets to 0. */
3418 int palette_changed;
3420 /* 4-byte ARGB palette entries, stored in native byte order; note that
3421 * the individual palette components should be on a 8-bit scale; if
3422 * the palette data comes from an IBM VGA native format, the component
3423 * data is probably 6 bits in size and needs to be scaled. */
3424 unsigned int palette[AVPALETTE_COUNT];
3426 } AVPaletteControl attribute_deprecated;
3429 enum AVSubtitleType {
3432 SUBTITLE_BITMAP, ///< A bitmap, pict will be set
3435 * Plain text, the text field must be set by the decoder and is
3436 * authoritative. ass and pict fields may contain approximations.
3441 * Formatted text, the ass field must be set by the decoder and is
3442 * authoritative. pict and text fields may contain approximations.
3447 typedef struct AVSubtitleRect {
3448 int x; ///< top left corner of pict, undefined when pict is not set
3449 int y; ///< top left corner of pict, undefined when pict is not set
3450 int w; ///< width of pict, undefined when pict is not set
3451 int h; ///< height of pict, undefined when pict is not set
3452 int nb_colors; ///< number of colors in pict, undefined when pict is not set
3455 * data+linesize for the bitmap of this subtitle.
3456 * can be set for text/ass as well once they where rendered
3459 enum AVSubtitleType type;
3461 char *text; ///< 0 terminated plain UTF-8 text
3464 * 0 terminated ASS/SSA compatible event line.
3465 * The pressentation of this is unaffected by the other values in this
3471 typedef struct AVSubtitle {
3472 uint16_t format; /* 0 = graphics */
3473 uint32_t start_display_time; /* relative to packet pts, in ms */
3474 uint32_t end_display_time; /* relative to packet pts, in ms */
3476 AVSubtitleRect **rects;
3477 int64_t pts; ///< Same as packet pts, in AV_TIME_BASE
3480 /* packet functions */
3483 * @deprecated use NULL instead
3485 attribute_deprecated void av_destruct_packet_nofree(AVPacket *pkt);
3488 * Default packet destructor.
3490 void av_destruct_packet(AVPacket *pkt);
3493 * Initialize optional fields of a packet with default values.
3497 void av_init_packet(AVPacket *pkt);
3500 * Allocate the payload of a packet and initialize its fields with
3504 * @param size wanted payload size
3505 * @return 0 if OK, AVERROR_xxx otherwise
3507 int av_new_packet(AVPacket *pkt, int size);
3510 * Reduce packet size, correctly zeroing padding
3513 * @param size new size
3515 void av_shrink_packet(AVPacket *pkt, int size);
3518 * Increase packet size, correctly zeroing padding
3521 * @param grow_by number of bytes by which to increase the size of the packet
3523 int av_grow_packet(AVPacket *pkt, int grow_by);
3526 * @warning This is a hack - the packet memory allocation stuff is broken. The
3527 * packet is allocated if it was not really allocated.
3529 int av_dup_packet(AVPacket *pkt);
3534 * @param pkt packet to free
3536 void av_free_packet(AVPacket *pkt);
3539 * Allocate new information of a packet.
3542 * @param type side information type
3543 * @param size side information size
3544 * @return pointer to fresh allocated data or NULL otherwise
3546 uint8_t* av_packet_new_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
3550 * Get side information from packet.
3553 * @param type desired side information type
3554 * @param size pointer for side information size to store (optional)
3555 * @return pointer to data if present or NULL otherwise
3557 uint8_t* av_packet_get_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
3560 int av_packet_merge_side_data(AVPacket *pkt);
3562 int av_packet_split_side_data(AVPacket *pkt);
3567 struct ReSampleContext;
3568 struct AVResampleContext;
3570 typedef struct ReSampleContext ReSampleContext;
3573 * Initialize audio resampling context.
3575 * @param output_channels number of output channels
3576 * @param input_channels number of input channels
3577 * @param output_rate output sample rate
3578 * @param input_rate input sample rate
3579 * @param sample_fmt_out requested output sample format
3580 * @param sample_fmt_in input sample format
3581 * @param filter_length length of each FIR filter in the filterbank relative to the cutoff frequency
3582 * @param log2_phase_count log2 of the number of entries in the polyphase filterbank
3583 * @param linear if 1 then the used FIR filter will be linearly interpolated
3584 between the 2 closest, if 0 the closest will be used
3585 * @param cutoff cutoff frequency, 1.0 corresponds to half the output sampling rate
3586 * @return allocated ReSampleContext, NULL if error occurred
3588 ReSampleContext *av_audio_resample_init(int output_channels, int input_channels,
3589 int output_rate, int input_rate,
3590 enum AVSampleFormat sample_fmt_out,
3591 enum AVSampleFormat sample_fmt_in,
3592 int filter_length, int log2_phase_count,
3593 int linear, double cutoff);
3595 int audio_resample(ReSampleContext *s, short *output, short *input, int nb_samples);
3598 * Free resample context.
3600 * @param s a non-NULL pointer to a resample context previously
3601 * created with av_audio_resample_init()
3603 void audio_resample_close(ReSampleContext *s);
3607 * Initialize an audio resampler.
3608 * Note, if either rate is not an integer then simply scale both rates up so they are.
3609 * @param filter_length length of each FIR filter in the filterbank relative to the cutoff freq
3610 * @param log2_phase_count log2 of the number of entries in the polyphase filterbank
3611 * @param linear If 1 then the used FIR filter will be linearly interpolated
3612 between the 2 closest, if 0 the closest will be used
3613 * @param cutoff cutoff frequency, 1.0 corresponds to half the output sampling rate
3615 struct AVResampleContext *av_resample_init(int out_rate, int in_rate, int filter_length, int log2_phase_count, int linear, double cutoff);
3618 * Resample an array of samples using a previously configured context.
3619 * @param src an array of unconsumed samples
3620 * @param consumed the number of samples of src which have been consumed are returned here
3621 * @param src_size the number of unconsumed samples available
3622 * @param dst_size the amount of space in samples available in dst
3623 * @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.
3624 * @return the number of samples written in dst or -1 if an error occurred
3626 int av_resample(struct AVResampleContext *c, short *dst, short *src, int *consumed, int src_size, int dst_size, int update_ctx);
3630 * Compensate samplerate/timestamp drift. The compensation is done by changing
3631 * the resampler parameters, so no audible clicks or similar distortions occur
3632 * @param compensation_distance distance in output samples over which the compensation should be performed
3633 * @param sample_delta number of output samples which should be output less
3635 * example: av_resample_compensate(c, 10, 500)
3636 * here instead of 510 samples only 500 samples would be output
3638 * note, due to rounding the actual compensation might be slightly different,
3639 * especially if the compensation_distance is large and the in_rate used during init is small
3641 void av_resample_compensate(struct AVResampleContext *c, int sample_delta, int compensation_distance);
3642 void av_resample_close(struct AVResampleContext *c);
3645 * Allocate memory for a picture. Call avpicture_free() to free it.
3647 * @see avpicture_fill()
3649 * @param picture the picture to be filled in
3650 * @param pix_fmt the format of the picture
3651 * @param width the width of the picture
3652 * @param height the height of the picture
3653 * @return zero if successful, a negative value if not
3655 int avpicture_alloc(AVPicture *picture, enum PixelFormat pix_fmt, int width, int height);
3658 * Free a picture previously allocated by avpicture_alloc().
3659 * The data buffer used by the AVPicture is freed, but the AVPicture structure
3662 * @param picture the AVPicture to be freed
3664 void avpicture_free(AVPicture *picture);
3667 * Fill in the AVPicture fields.
3668 * The fields of the given AVPicture are filled in by using the 'ptr' address
3669 * which points to the image data buffer. Depending on the specified picture
3670 * format, one or multiple image data pointers and line sizes will be set.
3671 * If a planar format is specified, several pointers will be set pointing to
3672 * the different picture planes and the line sizes of the different planes
3673 * will be stored in the lines_sizes array.
3674 * Call with ptr == NULL to get the required size for the ptr buffer.
3676 * To allocate the buffer and fill in the AVPicture fields in one call,
3677 * use avpicture_alloc().
3679 * @param picture AVPicture whose fields are to be filled in
3680 * @param ptr Buffer which will contain or contains the actual image data
3681 * @param pix_fmt The format in which the picture data is stored.
3682 * @param width the width of the image in pixels
3683 * @param height the height of the image in pixels
3684 * @return size of the image data in bytes
3686 int avpicture_fill(AVPicture *picture, uint8_t *ptr,
3687 enum PixelFormat pix_fmt, int width, int height);
3690 * Copy pixel data from an AVPicture into a buffer.
3691 * The data is stored compactly, without any gaps for alignment or padding
3692 * which may be applied by avpicture_fill().
3694 * @see avpicture_get_size()
3696 * @param[in] src AVPicture containing image data
3697 * @param[in] pix_fmt The format in which the picture data is stored.
3698 * @param[in] width the width of the image in pixels.
3699 * @param[in] height the height of the image in pixels.
3700 * @param[out] dest A buffer into which picture data will be copied.
3701 * @param[in] dest_size The size of 'dest'.
3702 * @return The number of bytes written to dest, or a negative value (error code) on error.
3704 int avpicture_layout(const AVPicture* src, enum PixelFormat pix_fmt, int width, int height,
3705 unsigned char *dest, int dest_size);
3708 * Calculate the size in bytes that a picture of the given width and height
3709 * would occupy if stored in the given picture format.
3710 * Note that this returns the size of a compact representation as generated
3711 * by avpicture_layout(), which can be smaller than the size required for e.g.
3714 * @param pix_fmt the given picture format
3715 * @param width the width of the image
3716 * @param height the height of the image
3717 * @return Image data size in bytes or -1 on error (e.g. too large dimensions).
3719 int avpicture_get_size(enum PixelFormat pix_fmt, int width, int height);
3720 void avcodec_get_chroma_sub_sample(enum PixelFormat pix_fmt, int *h_shift, int *v_shift);
3723 * Get the name of a codec.
3724 * @return a static string identifying the codec; never NULL
3726 const char *avcodec_get_name(enum CodecID id);
3728 #if FF_API_GET_PIX_FMT_NAME
3730 * Return the short name for a pixel format.
3732 * \see av_get_pix_fmt(), av_get_pix_fmt_string().
3733 * @deprecated Deprecated in favor of av_get_pix_fmt_name().
3735 attribute_deprecated
3736 const char *avcodec_get_pix_fmt_name(enum PixelFormat pix_fmt);
3739 void avcodec_set_dimensions(AVCodecContext *s, int width, int height);
3742 * Return a value representing the fourCC code associated to the
3743 * pixel format pix_fmt, or 0 if no associated fourCC code can be
3746 unsigned int avcodec_pix_fmt_to_codec_tag(enum PixelFormat pix_fmt);
3749 * Put a string representing the codec tag codec_tag in buf.
3751 * @param buf_size size in bytes of buf
3752 * @return the length of the string that would have been generated if
3753 * enough space had been available, excluding the trailing null
3755 size_t av_get_codec_tag_string(char *buf, size_t buf_size, unsigned int codec_tag);
3757 #define FF_LOSS_RESOLUTION 0x0001 /**< loss due to resolution change */
3758 #define FF_LOSS_DEPTH 0x0002 /**< loss due to color depth change */
3759 #define FF_LOSS_COLORSPACE 0x0004 /**< loss due to color space conversion */
3760 #define FF_LOSS_ALPHA 0x0008 /**< loss of alpha bits */
3761 #define FF_LOSS_COLORQUANT 0x0010 /**< loss due to color quantization */
3762 #define FF_LOSS_CHROMA 0x0020 /**< loss of chroma (e.g. RGB to gray conversion) */
3765 * Compute what kind of losses will occur when converting from one specific
3766 * pixel format to another.
3767 * When converting from one pixel format to another, information loss may occur.
3768 * For example, when converting from RGB24 to GRAY, the color information will
3769 * be lost. Similarly, other losses occur when converting from some formats to
3770 * other formats. These losses can involve loss of chroma, but also loss of
3771 * resolution, loss of color depth, loss due to the color space conversion, loss
3772 * of the alpha bits or loss due to color quantization.
3773 * avcodec_get_fix_fmt_loss() informs you about the various types of losses
3774 * which will occur when converting from one pixel format to another.
3776 * @param[in] dst_pix_fmt destination pixel format
3777 * @param[in] src_pix_fmt source pixel format
3778 * @param[in] has_alpha Whether the source pixel format alpha channel is used.
3779 * @return Combination of flags informing you what kind of losses will occur
3780 * (maximum loss for an invalid dst_pix_fmt).
3782 int avcodec_get_pix_fmt_loss(enum PixelFormat dst_pix_fmt, enum PixelFormat src_pix_fmt,
3786 * Find the best pixel format to convert to given a certain source pixel
3787 * format. When converting from one pixel format to another, information loss
3788 * may occur. For example, when converting from RGB24 to GRAY, the color
3789 * information will be lost. Similarly, other losses occur when converting from
3790 * some formats to other formats. avcodec_find_best_pix_fmt() searches which of
3791 * the given pixel formats should be used to suffer the least amount of loss.
3792 * The pixel formats from which it chooses one, are determined by the
3793 * pix_fmt_mask parameter.
3795 * Note, only the first 64 pixel formats will fit in pix_fmt_mask.
3798 * src_pix_fmt = PIX_FMT_YUV420P;
3799 * pix_fmt_mask = (1 << PIX_FMT_YUV422P) | (1 << PIX_FMT_RGB24);
3800 * dst_pix_fmt = avcodec_find_best_pix_fmt(pix_fmt_mask, src_pix_fmt, alpha, &loss);
3803 * @param[in] pix_fmt_mask bitmask determining which pixel format to choose from
3804 * @param[in] src_pix_fmt source pixel format
3805 * @param[in] has_alpha Whether the source pixel format alpha channel is used.
3806 * @param[out] loss_ptr Combination of flags informing you what kind of losses will occur.
3807 * @return The best pixel format to convert to or -1 if none was found.
3809 enum PixelFormat avcodec_find_best_pix_fmt(int64_t pix_fmt_mask, enum PixelFormat src_pix_fmt,
3810 int has_alpha, int *loss_ptr);
3813 * Find the best pixel format to convert to given a certain source pixel
3814 * format and a selection of two destination pixel formats. When converting from
3815 * one pixel format to another, information loss may occur. For example, when converting
3816 * from RGB24 to GRAY, the color information will be lost. Similarly, other losses occur when
3817 * converting from some formats to other formats. avcodec_find_best_pix_fmt2() selects which of
3818 * the given pixel formats should be used to suffer the least amount of loss.
3820 * If one of the destination formats is PIX_FMT_NONE the other pixel format (if valid) will be
3824 * src_pix_fmt = PIX_FMT_YUV420P;
3825 * dst_pix_fmt1= PIX_FMT_RGB24;
3826 * dst_pix_fmt2= PIX_FMT_GRAY8;
3827 * dst_pix_fmt3= PIX_FMT_RGB8;
3828 * loss= FF_LOSS_CHROMA; // don't care about chroma loss, so chroma loss will be ignored.
3829 * dst_pix_fmt = avcodec_find_best_pix_fmt2(dst_pix_fmt1, dst_pix_fmt2, src_pix_fmt, alpha, &loss);
3830 * dst_pix_fmt = avcodec_find_best_pix_fmt2(dst_pix_fmt, dst_pix_fmt3, src_pix_fmt, alpha, &loss);
3833 * @param[in] dst_pix_fmt1 One of the two destination pixel formats to choose from
3834 * @param[in] dst_pix_fmt2 The other of the two destination pixel formats to choose from
3835 * @param[in] src_pix_fmt Source pixel format
3836 * @param[in] has_alpha Whether the source pixel format alpha channel is used.
3837 * @param[in, out] loss_ptr Combination of loss flags. In: selects which of the losses to ignore, i.e.
3838 * NULL or value of zero means we care about all losses. Out: the loss
3839 * that occurs when converting from src to selected dst pixel format.
3840 * @return The best pixel format to convert to or -1 if none was found.
3842 enum PixelFormat avcodec_find_best_pix_fmt2(enum PixelFormat dst_pix_fmt1, enum PixelFormat dst_pix_fmt2,
3843 enum PixelFormat src_pix_fmt, int has_alpha, int *loss_ptr);
3845 #if FF_API_GET_ALPHA_INFO
3846 #define FF_ALPHA_TRANSP 0x0001 /* image has some totally transparent pixels */
3847 #define FF_ALPHA_SEMI_TRANSP 0x0002 /* image has some transparent pixels */
3850 * Tell if an image really has transparent alpha values.
3851 * @return ored mask of FF_ALPHA_xxx constants
3853 attribute_deprecated
3854 int img_get_alpha_info(const AVPicture *src,
3855 enum PixelFormat pix_fmt, int width, int height);
3858 /* deinterlace a picture */
3859 /* deinterlace - if not supported return -1 */
3860 int avpicture_deinterlace(AVPicture *dst, const AVPicture *src,
3861 enum PixelFormat pix_fmt, int width, int height);
3863 /* external high level API */
3866 * If c is NULL, returns the first registered codec,
3867 * if c is non-NULL, returns the next registered codec after c,
3868 * or NULL if c is the last one.
3870 AVCodec *av_codec_next(AVCodec *c);
3873 * Return the LIBAVCODEC_VERSION_INT constant.
3875 unsigned avcodec_version(void);
3878 * Return the libavcodec build-time configuration.
3880 const char *avcodec_configuration(void);
3883 * Return the libavcodec license.
3885 const char *avcodec_license(void);
3887 #if FF_API_AVCODEC_INIT
3889 * @deprecated this function is called automatically from avcodec_register()
3890 * and avcodec_register_all(), there is no need to call it manually
3892 attribute_deprecated
3893 void avcodec_init(void);
3897 * Register the codec codec and initialize libavcodec.
3899 * @warning either this function or avcodec_register_all() must be called
3900 * before any other libavcodec functions.
3902 * @see avcodec_register_all()
3904 void avcodec_register(AVCodec *codec);
3907 * Find a registered encoder with a matching codec ID.
3909 * @param id CodecID of the requested encoder
3910 * @return An encoder if one was found, NULL otherwise.
3912 AVCodec *avcodec_find_encoder(enum CodecID id);
3915 * Find a registered encoder with the specified name.
3917 * @param name name of the requested encoder
3918 * @return An encoder if one was found, NULL otherwise.
3920 AVCodec *avcodec_find_encoder_by_name(const char *name);
3923 * Find a registered decoder with a matching codec ID.
3925 * @param id CodecID of the requested decoder
3926 * @return A decoder if one was found, NULL otherwise.
3928 AVCodec *avcodec_find_decoder(enum CodecID id);
3931 * Find a registered decoder with the specified name.
3933 * @param name name of the requested decoder
3934 * @return A decoder if one was found, NULL otherwise.
3936 AVCodec *avcodec_find_decoder_by_name(const char *name);
3937 void avcodec_string(char *buf, int buf_size, AVCodecContext *enc, int encode);
3940 * Return a name for the specified profile, if available.
3942 * @param codec the codec that is searched for the given profile
3943 * @param profile the profile value for which a name is requested
3944 * @return A name for the profile if found, NULL otherwise.
3946 const char *av_get_profile_name(const AVCodec *codec, int profile);
3948 #if FF_API_ALLOC_CONTEXT
3950 * Set the fields of the given AVCodecContext to default values.
3952 * @param s The AVCodecContext of which the fields should be set to default values.
3953 * @deprecated use avcodec_get_context_defaults3
3955 attribute_deprecated
3956 void avcodec_get_context_defaults(AVCodecContext *s);
3958 /** THIS FUNCTION IS NOT YET PART OF THE PUBLIC API!
3959 * we WILL change its arguments and name a few times! */
3960 attribute_deprecated
3961 void avcodec_get_context_defaults2(AVCodecContext *s, enum AVMediaType);
3965 * Set the fields of the given AVCodecContext to default values corresponding
3966 * to the given codec (defaults may be codec-dependent).
3968 * Do not call this function if a non-NULL codec has been passed
3969 * to avcodec_alloc_context3() that allocated this AVCodecContext.
3970 * If codec is non-NULL, it is illegal to call avcodec_open2() with a
3971 * different codec on this AVCodecContext.
3973 int avcodec_get_context_defaults3(AVCodecContext *s, AVCodec *codec);
3975 #if FF_API_ALLOC_CONTEXT
3977 * Allocate an AVCodecContext and set its fields to default values. The
3978 * resulting struct can be deallocated by simply calling av_free().
3980 * @return An AVCodecContext filled with default values or NULL on failure.
3981 * @see avcodec_get_context_defaults
3983 * @deprecated use avcodec_alloc_context3()
3985 attribute_deprecated
3986 AVCodecContext *avcodec_alloc_context(void);
3988 /** THIS FUNCTION IS NOT YET PART OF THE PUBLIC API!
3989 * we WILL change its arguments and name a few times! */
3990 attribute_deprecated
3991 AVCodecContext *avcodec_alloc_context2(enum AVMediaType);
3995 * Allocate an AVCodecContext and set its fields to default values. The
3996 * resulting struct can be deallocated by simply calling av_free().
3998 * @param codec if non-NULL, allocate private data and initialize defaults
3999 * for the given codec. It is illegal to then call avcodec_open2()
4000 * with a different codec.
4002 * @return An AVCodecContext filled with default values or NULL on failure.
4003 * @see avcodec_get_context_defaults
4005 AVCodecContext *avcodec_alloc_context3(AVCodec *codec);
4008 * Copy the settings of the source AVCodecContext into the destination
4009 * AVCodecContext. The resulting destination codec context will be
4010 * unopened, i.e. you are required to call avcodec_open2() before you
4011 * can use this AVCodecContext to decode/encode video/audio data.
4013 * @param dest target codec context, should be initialized with
4014 * avcodec_alloc_context3(), but otherwise uninitialized
4015 * @param src source codec context
4016 * @return AVERROR() on error (e.g. memory allocation error), 0 on success
4018 int avcodec_copy_context(AVCodecContext *dest, const AVCodecContext *src);
4021 * Set the fields of the given AVFrame to default values.
4023 * @param pic The AVFrame of which the fields should be set to default values.
4025 void avcodec_get_frame_defaults(AVFrame *pic);
4028 * Allocate an AVFrame and set its fields to default values. The resulting
4029 * struct can be deallocated by simply calling av_free().
4031 * @return An AVFrame filled with default values or NULL on failure.
4032 * @see avcodec_get_frame_defaults
4034 AVFrame *avcodec_alloc_frame(void);
4036 int avcodec_default_get_buffer(AVCodecContext *s, AVFrame *pic);
4037 void avcodec_default_release_buffer(AVCodecContext *s, AVFrame *pic);
4038 int avcodec_default_reget_buffer(AVCodecContext *s, AVFrame *pic);
4041 * Return the amount of padding in pixels which the get_buffer callback must
4042 * provide around the edge of the image for codecs which do not have the
4043 * CODEC_FLAG_EMU_EDGE flag.
4045 * @return Required padding in pixels.
4047 unsigned avcodec_get_edge_width(void);
4049 * Modify width and height values so that they will result in a memory
4050 * buffer that is acceptable for the codec if you do not use any horizontal
4053 * May only be used if a codec with CODEC_CAP_DR1 has been opened.
4054 * If CODEC_FLAG_EMU_EDGE is not set, the dimensions must have been increased
4055 * according to avcodec_get_edge_width() before.
4057 void avcodec_align_dimensions(AVCodecContext *s, int *width, int *height);
4059 * Modify width and height values so that they will result in a memory
4060 * buffer that is acceptable for the codec if you also ensure that all
4061 * line sizes are a multiple of the respective linesize_align[i].
4063 * May only be used if a codec with CODEC_CAP_DR1 has been opened.
4064 * If CODEC_FLAG_EMU_EDGE is not set, the dimensions must have been increased
4065 * according to avcodec_get_edge_width() before.
4067 void avcodec_align_dimensions2(AVCodecContext *s, int *width, int *height,
4068 int linesize_align[AV_NUM_DATA_POINTERS]);
4070 enum PixelFormat avcodec_default_get_format(struct AVCodecContext *s, const enum PixelFormat * fmt);
4072 #if FF_API_THREAD_INIT
4074 * @deprecated Set s->thread_count before calling avcodec_open2() instead of calling this.
4076 attribute_deprecated
4077 int avcodec_thread_init(AVCodecContext *s, int thread_count);
4080 int avcodec_default_execute(AVCodecContext *c, int (*func)(AVCodecContext *c2, void *arg2),void *arg, int *ret, int count, int size);
4081 int avcodec_default_execute2(AVCodecContext *c, int (*func)(AVCodecContext *c2, void *arg2, int, int),void *arg, int *ret, int count);
4082 //FIXME func typedef
4084 #if FF_API_AVCODEC_OPEN
4086 * Initialize the AVCodecContext to use the given AVCodec. Prior to using this
4087 * function the context has to be allocated.
4089 * The functions avcodec_find_decoder_by_name(), avcodec_find_encoder_by_name(),
4090 * avcodec_find_decoder() and avcodec_find_encoder() provide an easy way for
4091 * retrieving a codec.
4093 * @warning This function is not thread safe!
4096 * avcodec_register_all();
4097 * codec = avcodec_find_decoder(CODEC_ID_H264);
4101 * context = avcodec_alloc_context3(codec);
4103 * if (avcodec_open(context, codec) < 0)
4107 * @param avctx The context which will be set up to use the given codec.
4108 * @param codec The codec to use within the context.
4109 * @return zero on success, a negative value on error
4110 * @see avcodec_alloc_context3, avcodec_find_decoder, avcodec_find_encoder, avcodec_close
4112 * @deprecated use avcodec_open2
4114 attribute_deprecated
4115 int avcodec_open(AVCodecContext *avctx, AVCodec *codec);
4119 * Initialize the AVCodecContext to use the given AVCodec. Prior to using this
4120 * function the context has to be allocated with avcodec_alloc_context3().
4122 * The functions avcodec_find_decoder_by_name(), avcodec_find_encoder_by_name(),
4123 * avcodec_find_decoder() and avcodec_find_encoder() provide an easy way for
4124 * retrieving a codec.
4126 * @warning This function is not thread safe!
4129 * avcodec_register_all();
4130 * av_dict_set(&opts, "b", "2.5M", 0);
4131 * codec = avcodec_find_decoder(CODEC_ID_H264);
4135 * context = avcodec_alloc_context3(codec);
4137 * if (avcodec_open2(context, codec, opts) < 0)
4141 * @param avctx The context to initialize.
4142 * @param options A dictionary filled with AVCodecContext and codec-private options.
4143 * On return this object will be filled with options that were not found.
4145 * @return zero on success, a negative value on error
4146 * @see avcodec_alloc_context3(), avcodec_find_decoder(), avcodec_find_encoder(),
4147 * av_dict_set(), av_opt_find().
4149 int avcodec_open2(AVCodecContext *avctx, AVCodec *codec, AVDictionary **options);
4151 #if FF_API_OLD_DECODE_AUDIO
4153 * Wrapper function which calls avcodec_decode_audio4.
4155 * @deprecated Use avcodec_decode_audio4 instead.
4157 * Decode the audio frame of size avpkt->size from avpkt->data into samples.
4158 * Some decoders may support multiple frames in a single AVPacket, such
4159 * decoders would then just decode the first frame. In this case,
4160 * avcodec_decode_audio3 has to be called again with an AVPacket that contains
4161 * the remaining data in order to decode the second frame etc.
4163 * could be outputted, frame_size_ptr is zero. Otherwise, it is the
4164 * decompressed frame size in bytes.
4166 * @warning You must set frame_size_ptr to the allocated size of the
4167 * output buffer before calling avcodec_decode_audio3().
4169 * @warning The input buffer must be FF_INPUT_BUFFER_PADDING_SIZE larger than
4170 * the actual read bytes because some optimized bitstream readers read 32 or 64
4171 * bits at once and could read over the end.
4173 * @warning The end of the input buffer avpkt->data should be set to 0 to ensure that
4174 * no overreading happens for damaged MPEG streams.
4176 * @note You might have to align the input buffer avpkt->data and output buffer
4177 * samples. The alignment requirements depend on the CPU: On some CPUs it isn't
4178 * necessary at all, on others it won't work at all if not aligned and on others
4179 * it will work but it will have an impact on performance.
4181 * In practice, avpkt->data should have 4 byte alignment at minimum and
4182 * samples should be 16 byte aligned unless the CPU doesn't need it
4183 * (AltiVec and SSE do).
4185 * @note Codecs which have the CODEC_CAP_DELAY capability set have a delay
4186 * between input and output, these need to be fed with avpkt->data=NULL,
4187 * avpkt->size=0 at the end to return the remaining frames.
4189 * @param avctx the codec context
4190 * @param[out] samples the output buffer, sample type in avctx->sample_fmt
4191 * If the sample format is planar, each channel plane will
4192 * be the same size, with no padding between channels.
4193 * @param[in,out] frame_size_ptr the output buffer size in bytes
4194 * @param[in] avpkt The input AVPacket containing the input buffer.
4195 * You can create such packet with av_init_packet() and by then setting
4196 * data and size, some decoders might in addition need other fields.
4197 * All decoders are designed to use the least fields possible though.
4198 * @return On error a negative value is returned, otherwise the number of bytes
4199 * used or zero if no frame data was decompressed (used) from the input AVPacket.
4201 attribute_deprecated int avcodec_decode_audio3(AVCodecContext *avctx, int16_t *samples,
4202 int *frame_size_ptr,
4207 * Decode the audio frame of size avpkt->size from avpkt->data into frame.
4209 * Some decoders may support multiple frames in a single AVPacket. Such
4210 * decoders would then just decode the first frame. In this case,
4211 * avcodec_decode_audio4 has to be called again with an AVPacket containing
4212 * the remaining data in order to decode the second frame, etc...
4213 * Even if no frames are returned, the packet needs to be fed to the decoder
4214 * with remaining data until it is completely consumed or an error occurs.
4216 * @warning The input buffer, avpkt->data must be FF_INPUT_BUFFER_PADDING_SIZE
4217 * larger than the actual read bytes because some optimized bitstream
4218 * readers read 32 or 64 bits at once and could read over the end.
4220 * @note You might have to align the input buffer. The alignment requirements
4221 * depend on the CPU and the decoder.
4223 * @param avctx the codec context
4224 * @param[out] frame The AVFrame in which to store decoded audio samples.
4225 * Decoders request a buffer of a particular size by setting
4226 * AVFrame.nb_samples prior to calling get_buffer(). The
4227 * decoder may, however, only utilize part of the buffer by
4228 * setting AVFrame.nb_samples to a smaller value in the
4230 * @param[out] got_frame_ptr Zero if no frame could be decoded, otherwise it is
4232 * @param[in] avpkt The input AVPacket containing the input buffer.
4233 * At least avpkt->data and avpkt->size should be set. Some
4234 * decoders might also require additional fields to be set.
4235 * @return A negative error code is returned if an error occurred during
4236 * decoding, otherwise the number of bytes consumed from the input
4237 * AVPacket is returned.
4239 int avcodec_decode_audio4(AVCodecContext *avctx, AVFrame *frame,
4240 int *got_frame_ptr, AVPacket *avpkt);
4243 * Decode the video frame of size avpkt->size from avpkt->data into picture.
4244 * Some decoders may support multiple frames in a single AVPacket, such
4245 * decoders would then just decode the first frame.
4247 * @warning The input buffer must be FF_INPUT_BUFFER_PADDING_SIZE larger than
4248 * the actual read bytes because some optimized bitstream readers read 32 or 64
4249 * bits at once and could read over the end.
4251 * @warning The end of the input buffer buf should be set to 0 to ensure that
4252 * no overreading happens for damaged MPEG streams.
4254 * @note You might have to align the input buffer avpkt->data.
4255 * The alignment requirements depend on the CPU: on some CPUs it isn't
4256 * necessary at all, on others it won't work at all if not aligned and on others
4257 * it will work but it will have an impact on performance.
4259 * In practice, avpkt->data should have 4 byte alignment at minimum.
4261 * @note Codecs which have the CODEC_CAP_DELAY capability set have a delay
4262 * between input and output, these need to be fed with avpkt->data=NULL,
4263 * avpkt->size=0 at the end to return the remaining frames.
4265 * @param avctx the codec context
4266 * @param[out] picture The AVFrame in which the decoded video frame will be stored.
4267 * Use avcodec_alloc_frame to get an AVFrame, the codec will
4268 * allocate memory for the actual bitmap.
4269 * with default get/release_buffer(), the decoder frees/reuses the bitmap as it sees fit.
4270 * with overridden get/release_buffer() (needs CODEC_CAP_DR1) the user decides into what buffer the decoder
4271 * decodes and the decoder tells the user once it does not need the data anymore,
4272 * the user app can at this point free/reuse/keep the memory as it sees fit.
4274 * @param[in] avpkt The input AVpacket containing the input buffer.
4275 * You can create such packet with av_init_packet() and by then setting
4276 * data and size, some decoders might in addition need other fields like
4277 * flags&AV_PKT_FLAG_KEY. All decoders are designed to use the least
4279 * @param[in,out] got_picture_ptr Zero if no frame could be decompressed, otherwise, it is nonzero.
4280 * @return On error a negative value is returned, otherwise the number of bytes
4281 * used or zero if no frame could be decompressed.
4283 int avcodec_decode_video2(AVCodecContext *avctx, AVFrame *picture,
4284 int *got_picture_ptr,
4288 * Decode a subtitle message.
4289 * Return a negative value on error, otherwise return the number of bytes used.
4290 * If no subtitle could be decompressed, got_sub_ptr is zero.
4291 * Otherwise, the subtitle is stored in *sub.
4292 * Note that CODEC_CAP_DR1 is not available for subtitle codecs. This is for
4293 * simplicity, because the performance difference is expect to be negligible
4294 * and reusing a get_buffer written for video codecs would probably perform badly
4295 * due to a potentially very different allocation pattern.
4297 * @param avctx the codec context
4298 * @param[out] sub The AVSubtitle in which the decoded subtitle will be stored, must be
4299 freed with avsubtitle_free if *got_sub_ptr is set.
4300 * @param[in,out] got_sub_ptr Zero if no subtitle could be decompressed, otherwise, it is nonzero.
4301 * @param[in] avpkt The input AVPacket containing the input buffer.
4303 int avcodec_decode_subtitle2(AVCodecContext *avctx, AVSubtitle *sub,
4308 * Free all allocated data in the given subtitle struct.
4310 * @param sub AVSubtitle to free.
4312 void avsubtitle_free(AVSubtitle *sub);
4315 * Encode an audio frame from samples into buf.
4317 * @note The output buffer should be at least FF_MIN_BUFFER_SIZE bytes large.
4318 * However, for PCM audio the user will know how much space is needed
4319 * because it depends on the value passed in buf_size as described
4320 * below. In that case a lower value can be used.
4322 * @param avctx the codec context
4323 * @param[out] buf the output buffer
4324 * @param[in] buf_size the output buffer size
4325 * @param[in] samples the input buffer containing the samples
4326 * The number of samples read from this buffer is frame_size*channels,
4327 * both of which are defined in avctx.
4328 * For PCM audio the number of samples read from samples is equal to
4329 * buf_size * input_sample_size / output_sample_size.
4330 * @return On error a negative value is returned, on success zero or the number
4331 * of bytes used to encode the data read from the input buffer.
4333 int avcodec_encode_audio(AVCodecContext *avctx, uint8_t *buf, int buf_size,
4334 const short *samples);
4337 * Encode a video frame from pict into buf.
4338 * The input picture should be
4339 * stored using a specific format, namely avctx.pix_fmt.
4341 * @param avctx the codec context
4342 * @param[out] buf the output buffer for the bitstream of encoded frame
4343 * @param[in] buf_size the size of the output buffer in bytes
4344 * @param[in] pict the input picture to encode
4345 * @return On error a negative value is returned, on success zero or the number
4346 * of bytes used from the output buffer.
4348 int avcodec_encode_video(AVCodecContext *avctx, uint8_t *buf, int buf_size,
4349 const AVFrame *pict);
4350 int avcodec_encode_subtitle(AVCodecContext *avctx, uint8_t *buf, int buf_size,
4351 const AVSubtitle *sub);
4353 int avcodec_close(AVCodecContext *avctx);
4356 * Register all the codecs, parsers and bitstream filters which were enabled at
4357 * configuration time. If you do not call this function you can select exactly
4358 * which formats you want to support, by using the individual registration
4361 * @see avcodec_register
4362 * @see av_register_codec_parser
4363 * @see av_register_bitstream_filter
4365 void avcodec_register_all(void);
4368 * Flush buffers, should be called when seeking or when switching to a different stream.
4370 void avcodec_flush_buffers(AVCodecContext *avctx);
4372 void avcodec_default_free_buffers(AVCodecContext *s);
4374 /* misc useful functions */
4376 #if FF_API_OLD_FF_PICT_TYPES
4378 * Return a single letter to describe the given picture type pict_type.
4380 * @param[in] pict_type the picture type
4381 * @return A single character representing the picture type.
4382 * @deprecated Use av_get_picture_type_char() instead.
4384 attribute_deprecated
4385 char av_get_pict_type_char(int pict_type);
4389 * Return codec bits per sample.
4391 * @param[in] codec_id the codec
4392 * @return Number of bits per sample or zero if unknown for the given codec.
4394 int av_get_bits_per_sample(enum CodecID codec_id);
4396 #if FF_API_OLD_SAMPLE_FMT
4398 * @deprecated Use av_get_bytes_per_sample() instead.
4400 attribute_deprecated
4401 int av_get_bits_per_sample_format(enum AVSampleFormat sample_fmt);
4405 typedef struct AVCodecParserContext {
4407 struct AVCodecParser *parser;
4408 int64_t frame_offset; /* offset of the current frame */
4409 int64_t cur_offset; /* current offset
4410 (incremented by each av_parser_parse()) */
4411 int64_t next_frame_offset; /* offset of the next frame */
4413 int pict_type; /* XXX: Put it back in AVCodecContext. */
4415 * This field is used for proper frame duration computation in lavf.
4416 * It signals, how much longer the frame duration of the current frame
4417 * is compared to normal frame duration.
4419 * frame_duration = (1 + repeat_pict) * time_base
4421 * It is used by codecs like H.264 to display telecined material.
4423 int repeat_pict; /* XXX: Put it back in AVCodecContext. */
4424 int64_t pts; /* pts of the current frame */
4425 int64_t dts; /* dts of the current frame */
4430 int fetch_timestamp;
4432 #define AV_PARSER_PTS_NB 4
4433 int cur_frame_start_index;
4434 int64_t cur_frame_offset[AV_PARSER_PTS_NB];
4435 int64_t cur_frame_pts[AV_PARSER_PTS_NB];
4436 int64_t cur_frame_dts[AV_PARSER_PTS_NB];
4439 #define PARSER_FLAG_COMPLETE_FRAMES 0x0001
4440 #define PARSER_FLAG_ONCE 0x0002
4441 /// Set if the parser has a valid file offset
4442 #define PARSER_FLAG_FETCHED_OFFSET 0x0004
4444 int64_t offset; ///< byte offset from starting packet start
4445 int64_t cur_frame_end[AV_PARSER_PTS_NB];
4448 * Set by parser to 1 for key frames and 0 for non-key frames.
4449 * It is initialized to -1, so if the parser doesn't set this flag,
4450 * old-style fallback using AV_PICTURE_TYPE_I picture type as key frames
4456 * Time difference in stream time base units from the pts of this
4457 * packet to the point at which the output from the decoder has converged
4458 * independent from the availability of previous frames. That is, the
4459 * frames are virtually identical no matter if decoding started from
4460 * the very first frame or from this keyframe.
4461 * Is AV_NOPTS_VALUE if unknown.
4462 * This field is not the display duration of the current frame.
4463 * This field has no meaning if the packet does not have AV_PKT_FLAG_KEY
4466 * The purpose of this field is to allow seeking in streams that have no
4467 * keyframes in the conventional sense. It corresponds to the
4468 * recovery point SEI in H.264 and match_time_delta in NUT. It is also
4469 * essential for some types of subtitle streams to ensure that all
4470 * subtitles are correctly displayed after seeking.
4472 int64_t convergence_duration;
4474 // Timestamp generation support:
4476 * Synchronization point for start of timestamp generation.
4478 * Set to >0 for sync point, 0 for no sync point and <0 for undefined
4481 * For example, this corresponds to presence of H.264 buffering period
4487 * Offset of the current timestamp against last timestamp sync point in
4488 * units of AVCodecContext.time_base.
4490 * Set to INT_MIN when dts_sync_point unused. Otherwise, it must
4491 * contain a valid timestamp offset.
4493 * Note that the timestamp of sync point has usually a nonzero
4494 * dts_ref_dts_delta, which refers to the previous sync point. Offset of
4495 * the next frame after timestamp sync point will be usually 1.
4497 * For example, this corresponds to H.264 cpb_removal_delay.
4499 int dts_ref_dts_delta;
4502 * Presentation delay of current frame in units of AVCodecContext.time_base.
4504 * Set to INT_MIN when dts_sync_point unused. Otherwise, it must
4505 * contain valid non-negative timestamp delta (presentation time of a frame
4506 * must not lie in the past).
4508 * This delay represents the difference between decoding and presentation
4509 * time of the frame.
4511 * For example, this corresponds to H.264 dpb_output_delay.
4516 * Position of the packet in file.
4518 * Analogous to cur_frame_pts/dts
4520 int64_t cur_frame_pos[AV_PARSER_PTS_NB];
4523 * Byte position of currently parsed frame in stream.
4528 * Previous frame byte position.
4531 } AVCodecParserContext;
4533 typedef struct AVCodecParser {
4534 int codec_ids[5]; /* several codec IDs are permitted */
4536 int (*parser_init)(AVCodecParserContext *s);
4537 int (*parser_parse)(AVCodecParserContext *s,
4538 AVCodecContext *avctx,
4539 const uint8_t **poutbuf, int *poutbuf_size,
4540 const uint8_t *buf, int buf_size);
4541 void (*parser_close)(AVCodecParserContext *s);
4542 int (*split)(AVCodecContext *avctx, const uint8_t *buf, int buf_size);
4543 struct AVCodecParser *next;
4546 AVCodecParser *av_parser_next(AVCodecParser *c);
4548 void av_register_codec_parser(AVCodecParser *parser);
4549 AVCodecParserContext *av_parser_init(int codec_id);
4554 * @param s parser context.
4555 * @param avctx codec context.
4556 * @param poutbuf set to pointer to parsed buffer or NULL if not yet finished.
4557 * @param poutbuf_size set to size of parsed buffer or zero if not yet finished.
4558 * @param buf input buffer.
4559 * @param buf_size input length, to signal EOF, this should be 0 (so that the last frame can be output).
4560 * @param pts input presentation timestamp.
4561 * @param dts input decoding timestamp.
4562 * @param pos input byte position in stream.
4563 * @return the number of bytes of the input bitstream used.
4568 * len = av_parser_parse2(myparser, AVCodecContext, &data, &size,
4575 * decode_frame(data, size);
4579 int av_parser_parse2(AVCodecParserContext *s,
4580 AVCodecContext *avctx,
4581 uint8_t **poutbuf, int *poutbuf_size,
4582 const uint8_t *buf, int buf_size,
4583 int64_t pts, int64_t dts,
4586 int av_parser_change(AVCodecParserContext *s,
4587 AVCodecContext *avctx,
4588 uint8_t **poutbuf, int *poutbuf_size,
4589 const uint8_t *buf, int buf_size, int keyframe);
4590 void av_parser_close(AVCodecParserContext *s);
4593 typedef struct AVBitStreamFilterContext {
4595 struct AVBitStreamFilter *filter;
4596 AVCodecParserContext *parser;
4597 struct AVBitStreamFilterContext *next;
4598 } AVBitStreamFilterContext;
4601 typedef struct AVBitStreamFilter {
4604 int (*filter)(AVBitStreamFilterContext *bsfc,
4605 AVCodecContext *avctx, const char *args,
4606 uint8_t **poutbuf, int *poutbuf_size,
4607 const uint8_t *buf, int buf_size, int keyframe);
4608 void (*close)(AVBitStreamFilterContext *bsfc);
4609 struct AVBitStreamFilter *next;
4610 } AVBitStreamFilter;
4612 void av_register_bitstream_filter(AVBitStreamFilter *bsf);
4613 AVBitStreamFilterContext *av_bitstream_filter_init(const char *name);
4614 int av_bitstream_filter_filter(AVBitStreamFilterContext *bsfc,
4615 AVCodecContext *avctx, const char *args,
4616 uint8_t **poutbuf, int *poutbuf_size,
4617 const uint8_t *buf, int buf_size, int keyframe);
4618 void av_bitstream_filter_close(AVBitStreamFilterContext *bsf);
4620 AVBitStreamFilter *av_bitstream_filter_next(AVBitStreamFilter *f);
4625 * Reallocate the given block if it is not large enough, otherwise do nothing.
4629 void *av_fast_realloc(void *ptr, unsigned int *size, size_t min_size);
4632 * Allocate a buffer, reusing the given one if large enough.
4634 * Contrary to av_fast_realloc the current buffer contents might not be
4635 * preserved and on error the old buffer is freed, thus no special
4636 * handling to avoid memleaks is necessary.
4638 * @param ptr pointer to pointer to already allocated buffer, overwritten with pointer to new buffer
4639 * @param size size of the buffer *ptr points to
4640 * @param min_size minimum size of *ptr buffer after returning, *ptr will be NULL and
4641 * *size 0 if an error occurred.
4643 void av_fast_malloc(void *ptr, unsigned int *size, size_t min_size);
4646 * Copy image src to dst. Wraps av_picture_data_copy() above.
4648 void av_picture_copy(AVPicture *dst, const AVPicture *src,
4649 enum PixelFormat pix_fmt, int width, int height);
4652 * Crop image top and left side.
4654 int av_picture_crop(AVPicture *dst, const AVPicture *src,
4655 enum PixelFormat pix_fmt, int top_band, int left_band);
4660 int av_picture_pad(AVPicture *dst, const AVPicture *src, int height, int width, enum PixelFormat pix_fmt,
4661 int padtop, int padbottom, int padleft, int padright, int *color);
4664 * Encode extradata length to a buffer. Used by xiph codecs.
4666 * @param s buffer to write to; must be at least (v/255+1) bytes long
4667 * @param v size of extradata in bytes
4668 * @return number of bytes written to the buffer.
4670 unsigned int av_xiphlacing(unsigned char *s, unsigned int v);
4673 * Log a generic warning message about a missing feature. This function is
4674 * intended to be used internally by FFmpeg (libavcodec, libavformat, etc.)
4675 * only, and would normally not be used by applications.
4676 * @param[in] avc a pointer to an arbitrary struct of which the first field is
4677 * a pointer to an AVClass struct
4678 * @param[in] feature string containing the name of the missing feature
4679 * @param[in] want_sample indicates if samples are wanted which exhibit this feature.
4680 * If want_sample is non-zero, additional verbage will be added to the log
4681 * message which tells the user how to report samples to the development
4684 void av_log_missing_feature(void *avc, const char *feature, int want_sample);
4687 * Log a generic warning message asking for a sample. This function is
4688 * intended to be used internally by FFmpeg (libavcodec, libavformat, etc.)
4689 * only, and would normally not be used by applications.
4690 * @param[in] avc a pointer to an arbitrary struct of which the first field is
4691 * a pointer to an AVClass struct
4692 * @param[in] msg string containing an optional message, or NULL if no message
4694 void av_log_ask_for_sample(void *avc, const char *msg, ...) av_printf_format(2, 3);
4697 * Register the hardware accelerator hwaccel.
4699 void av_register_hwaccel(AVHWAccel *hwaccel);
4702 * If hwaccel is NULL, returns the first registered hardware accelerator,
4703 * if hwaccel is non-NULL, returns the next registered hardware accelerator
4704 * after hwaccel, or NULL if hwaccel is the last one.
4706 AVHWAccel *av_hwaccel_next(AVHWAccel *hwaccel);
4710 * Lock operation used by lockmgr
4713 AV_LOCK_CREATE, ///< Create a mutex
4714 AV_LOCK_OBTAIN, ///< Lock the mutex
4715 AV_LOCK_RELEASE, ///< Unlock the mutex
4716 AV_LOCK_DESTROY, ///< Free mutex resources
4720 * Register a user provided lock manager supporting the operations
4721 * specified by AVLockOp. mutex points to a (void *) where the
4722 * lockmgr should store/get a pointer to a user allocated mutex. It's
4723 * NULL upon AV_LOCK_CREATE and != NULL for all other ops.
4725 * @param cb User defined callback. Note: FFmpeg may invoke calls to this
4726 * callback during the call to av_lockmgr_register().
4727 * Thus, the application must be prepared to handle that.
4728 * If cb is set to NULL the lockmgr will be unregistered.
4729 * Also note that during unregistration the previously registered
4730 * lockmgr callback may also be invoked.
4732 int av_lockmgr_register(int (*cb)(void **mutex, enum AVLockOp op));
4735 * Get the type of the given codec.
4737 enum AVMediaType avcodec_get_type(enum CodecID codec_id);
4740 * Get the AVClass for AVCodecContext. It can be used in combination with
4741 * AV_OPT_SEARCH_FAKE_OBJ for examining options.
4743 * @see av_opt_find().
4745 const AVClass *avcodec_get_class(void);
4748 * Get the AVClass for AVFrame. It can be used in combination with
4749 * AV_OPT_SEARCH_FAKE_OBJ for examining options.
4751 * @see av_opt_find().
4753 const AVClass *avcodec_get_frame_class(void);
4755 #endif /* AVCODEC_AVCODEC_H */