2 * copyright (c) 2001 Fabrice Bellard
4 * This file is part of FFmpeg.
6 * FFmpeg is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
11 * FFmpeg is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with FFmpeg; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21 #ifndef AVCODEC_AVCODEC_H
22 #define AVCODEC_AVCODEC_H
30 #include "libavutil/samplefmt.h"
31 #include "libavutil/avutil.h"
32 #include "libavutil/cpu.h"
33 #include "libavutil/dict.h"
34 #include "libavutil/log.h"
35 #include "libavutil/pixfmt.h"
36 #include "libavutil/rational.h"
38 #include "libavcodec/version.h"
41 * Identify the syntax and semantics of the bitstream.
42 * The principle is roughly:
43 * Two decoders with the same ID can decode the same streams.
44 * Two encoders with the same ID can encode compatible streams.
45 * There may be slight deviations from the principle due to implementation
48 * If you add a codec ID to this list, add it so that
49 * 1. no value of a existing codec ID changes (that would break ABI),
50 * 2. Give it a value which when taken as ASCII is recognized uniquely by a human as this specific codec.
51 * This ensures that 2 forks can independantly add CodecIDs without producing conflicts.
58 CODEC_ID_MPEG2VIDEO, ///< preferred ID for MPEG-1/2 video decoding
59 CODEC_ID_MPEG2VIDEO_XVMC,
96 CODEC_ID_INTERPLAY_VIDEO,
108 CODEC_ID_TRUEMOTION1,
135 CODEC_ID_TRUEMOTION2,
152 CODEC_ID_DSICINVIDEO,
153 CODEC_ID_TIERTEXSEQVIDEO,
156 #if LIBAVCODEC_VERSION_MAJOR == 53
164 CODEC_ID_BETHSOFTVID,
176 #if LIBAVCODEC_VERSION_MAJOR == 53
184 CODEC_ID_MOTIONPIXELS,
202 CODEC_ID_IFF_BYTERUN1,
218 #if LIBAVCODEC_VERSION_MAJOR == 53
219 CODEC_ID_G723_1_DEPRECATED,
220 CODEC_ID_G729_DEPRECATED,
222 CODEC_ID_UTVIDEO_DEPRECATED,
224 CODEC_ID_UTVIDEO = 0x800,
226 CODEC_ID_G2M = MKBETAG( 0 ,'G','2','M'),
228 /* various PCM "codecs" */
229 CODEC_ID_FIRST_AUDIO = 0x10000, ///< A dummy id pointing at the start of audio codecs
230 CODEC_ID_PCM_S16LE = 0x10000,
246 CODEC_ID_PCM_S24DAUD,
248 CODEC_ID_PCM_S16LE_PLANAR,
257 CODEC_ID_PCM_S8_PLANAR,
259 /* various ADPCM codecs */
260 CODEC_ID_ADPCM_IMA_QT = 0x11000,
261 CODEC_ID_ADPCM_IMA_WAV,
262 CODEC_ID_ADPCM_IMA_DK3,
263 CODEC_ID_ADPCM_IMA_DK4,
264 CODEC_ID_ADPCM_IMA_WS,
265 CODEC_ID_ADPCM_IMA_SMJPEG,
274 CODEC_ID_ADPCM_YAMAHA,
275 CODEC_ID_ADPCM_SBPRO_4,
276 CODEC_ID_ADPCM_SBPRO_3,
277 CODEC_ID_ADPCM_SBPRO_2,
279 CODEC_ID_ADPCM_IMA_AMV,
280 CODEC_ID_ADPCM_EA_R1,
281 CODEC_ID_ADPCM_EA_R3,
282 CODEC_ID_ADPCM_EA_R2,
283 CODEC_ID_ADPCM_IMA_EA_SEAD,
284 CODEC_ID_ADPCM_IMA_EA_EACS,
285 CODEC_ID_ADPCM_EA_XAS,
286 CODEC_ID_ADPCM_EA_MAXIS_XA,
287 CODEC_ID_ADPCM_IMA_ISS,
291 CODEC_ID_AMR_NB = 0x12000,
294 /* RealAudio codecs*/
295 CODEC_ID_RA_144 = 0x13000,
298 /* various DPCM codecs */
299 CODEC_ID_ROQ_DPCM = 0x14000,
300 CODEC_ID_INTERPLAY_DPCM,
305 CODEC_ID_MP2 = 0x15000,
306 CODEC_ID_MP3, ///< preferred ID for decoding MPEG audio layer 1, 2 or 3
317 #if LIBAVCODEC_VERSION_MAJOR == 53
326 CODEC_ID_WESTWOOD_SND1,
327 CODEC_ID_GSM, ///< as in Berlin toast format
335 CODEC_ID_DSICINAUDIO,
339 CODEC_ID_GSM_MS, /* as found in WAV */
348 CODEC_ID_WMALOSSLESS,
357 CODEC_ID_BINKAUDIO_RDFT,
358 CODEC_ID_BINKAUDIO_DCT,
362 #if LIBAVCODEC_VERSION_MAJOR > 53
363 CODEC_ID_G723_1_DEPRECATED,
364 CODEC_ID_G729_DEPRECATED,
369 CODEC_ID_G729 = 0x15800,
370 CODEC_ID_G723_1= 0x15801,
371 CODEC_ID_8SVX_RAW = MKBETAG('8','S','V','X'),
373 /* subtitle codecs */
374 CODEC_ID_FIRST_SUBTITLE = 0x17000, ///< A dummy ID pointing at the start of subtitle codecs.
375 CODEC_ID_DVD_SUBTITLE = 0x17000,
376 CODEC_ID_DVB_SUBTITLE,
377 CODEC_ID_TEXT, ///< raw UTF-8 text
381 CODEC_ID_HDMV_PGS_SUBTITLE,
382 CODEC_ID_DVB_TELETEXT,
384 CODEC_ID_MICRODVD = MKBETAG('m','D','V','D'),
386 /* other specific kind of codecs (generally used for attachments) */
387 CODEC_ID_FIRST_UNKNOWN = 0x18000, ///< A dummy ID pointing at the start of various fake codecs.
388 CODEC_ID_TTF = 0x18000,
389 CODEC_ID_BINTEXT = MKBETAG('B','T','X','T'),
390 CODEC_ID_XBIN = MKBETAG('X','B','I','N'),
391 CODEC_ID_IDF = MKBETAG( 0 ,'I','D','F'),
393 CODEC_ID_PROBE = 0x19000, ///< codec_id is not known (like CODEC_ID_NONE) but lavf should attempt to identify it
395 CODEC_ID_MPEG2TS = 0x20000, /**< _FAKE_ codec to indicate a raw MPEG-2 TS
396 * stream (only used by libavformat) */
397 CODEC_ID_MPEG4SYSTEMS = 0x20001, /**< _FAKE_ codec to indicate a MPEG-4 Systems
398 * stream (only used by libavformat) */
399 CODEC_ID_FFMETADATA = 0x21000, ///< Dummy codec for streams containing only metadata information.
402 #if FF_API_OLD_SAMPLE_FMT
403 #define SampleFormat AVSampleFormat
405 #define SAMPLE_FMT_NONE AV_SAMPLE_FMT_NONE
406 #define SAMPLE_FMT_U8 AV_SAMPLE_FMT_U8
407 #define SAMPLE_FMT_S16 AV_SAMPLE_FMT_S16
408 #define SAMPLE_FMT_S32 AV_SAMPLE_FMT_S32
409 #define SAMPLE_FMT_FLT AV_SAMPLE_FMT_FLT
410 #define SAMPLE_FMT_DBL AV_SAMPLE_FMT_DBL
411 #define SAMPLE_FMT_NB AV_SAMPLE_FMT_NB
414 #if FF_API_OLD_AUDIOCONVERT
415 #include "libavutil/audioconvert.h"
417 /* Audio channel masks */
418 #define CH_FRONT_LEFT AV_CH_FRONT_LEFT
419 #define CH_FRONT_RIGHT AV_CH_FRONT_RIGHT
420 #define CH_FRONT_CENTER AV_CH_FRONT_CENTER
421 #define CH_LOW_FREQUENCY AV_CH_LOW_FREQUENCY
422 #define CH_BACK_LEFT AV_CH_BACK_LEFT
423 #define CH_BACK_RIGHT AV_CH_BACK_RIGHT
424 #define CH_FRONT_LEFT_OF_CENTER AV_CH_FRONT_LEFT_OF_CENTER
425 #define CH_FRONT_RIGHT_OF_CENTER AV_CH_FRONT_RIGHT_OF_CENTER
426 #define CH_BACK_CENTER AV_CH_BACK_CENTER
427 #define CH_SIDE_LEFT AV_CH_SIDE_LEFT
428 #define CH_SIDE_RIGHT AV_CH_SIDE_RIGHT
429 #define CH_TOP_CENTER AV_CH_TOP_CENTER
430 #define CH_TOP_FRONT_LEFT AV_CH_TOP_FRONT_LEFT
431 #define CH_TOP_FRONT_CENTER AV_CH_TOP_FRONT_CENTER
432 #define CH_TOP_FRONT_RIGHT AV_CH_TOP_FRONT_RIGHT
433 #define CH_TOP_BACK_LEFT AV_CH_TOP_BACK_LEFT
434 #define CH_TOP_BACK_CENTER AV_CH_TOP_BACK_CENTER
435 #define CH_TOP_BACK_RIGHT AV_CH_TOP_BACK_RIGHT
436 #define CH_STEREO_LEFT AV_CH_STEREO_LEFT
437 #define CH_STEREO_RIGHT AV_CH_STEREO_RIGHT
439 /** Channel mask value used for AVCodecContext.request_channel_layout
440 to indicate that the user requests the channel order of the decoder output
441 to be the native codec channel order. */
442 #define CH_LAYOUT_NATIVE AV_CH_LAYOUT_NATIVE
444 /* Audio channel convenience macros */
445 #define CH_LAYOUT_MONO AV_CH_LAYOUT_MONO
446 #define CH_LAYOUT_STEREO AV_CH_LAYOUT_STEREO
447 #define CH_LAYOUT_2_1 AV_CH_LAYOUT_2_1
448 #define CH_LAYOUT_SURROUND AV_CH_LAYOUT_SURROUND
449 #define CH_LAYOUT_4POINT0 AV_CH_LAYOUT_4POINT0
450 #define CH_LAYOUT_2_2 AV_CH_LAYOUT_2_2
451 #define CH_LAYOUT_QUAD AV_CH_LAYOUT_QUAD
452 #define CH_LAYOUT_5POINT0 AV_CH_LAYOUT_5POINT0
453 #define CH_LAYOUT_5POINT1 AV_CH_LAYOUT_5POINT1
454 #define CH_LAYOUT_5POINT0_BACK AV_CH_LAYOUT_5POINT0_BACK
455 #define CH_LAYOUT_5POINT1_BACK AV_CH_LAYOUT_5POINT1_BACK
456 #define CH_LAYOUT_7POINT0 AV_CH_LAYOUT_7POINT0
457 #define CH_LAYOUT_7POINT1 AV_CH_LAYOUT_7POINT1
458 #define CH_LAYOUT_7POINT1_WIDE AV_CH_LAYOUT_7POINT1_WIDE
459 #define CH_LAYOUT_STEREO_DOWNMIX AV_CH_LAYOUT_STEREO_DOWNMIX
463 #define AVCODEC_MAX_AUDIO_FRAME_SIZE 192000 // 1 second of 48khz 32bit audio
466 * Required number of additionally allocated bytes at the end of the input bitstream for decoding.
467 * This is mainly needed because some optimized bitstream readers read
468 * 32 or 64 bit at once and could read over the end.<br>
469 * Note: If the first 23 bits of the additional bytes are not 0, then damaged
470 * MPEG bitstreams could cause overread and segfault.
472 #define FF_INPUT_BUFFER_PADDING_SIZE 16
475 * minimum encoding buffer size
476 * Used to avoid some checks during header writing.
478 #define FF_MIN_BUFFER_SIZE 16384
482 * motion estimation type.
485 ME_ZERO = 1, ///< no search, that is use 0,0 vector whenever one is needed
489 ME_EPZS, ///< enhanced predictive zonal search
490 ME_X1, ///< reserved for experiments
491 ME_HEX, ///< hexagon based search
492 ME_UMH, ///< uneven multi-hexagon search
493 ME_ITER, ///< iterative search
494 ME_TESA, ///< transformed exhaustive search algorithm
498 /* We leave some space between them for extensions (drop some
499 * keyframes for intra-only or drop just some bidir frames). */
500 AVDISCARD_NONE =-16, ///< discard nothing
501 AVDISCARD_DEFAULT= 0, ///< discard useless packets like 0 size packets in avi
502 AVDISCARD_NONREF = 8, ///< discard all non reference
503 AVDISCARD_BIDIR = 16, ///< discard all bidirectional frames
504 AVDISCARD_NONKEY = 32, ///< discard all frames except keyframes
505 AVDISCARD_ALL = 48, ///< discard all
508 enum AVColorPrimaries{
509 AVCOL_PRI_BT709 =1, ///< also ITU-R BT1361 / IEC 61966-2-4 / SMPTE RP177 Annex B
510 AVCOL_PRI_UNSPECIFIED=2,
512 AVCOL_PRI_BT470BG =5, ///< also ITU-R BT601-6 625 / ITU-R BT1358 625 / ITU-R BT1700 625 PAL & SECAM
513 AVCOL_PRI_SMPTE170M =6, ///< also ITU-R BT601-6 525 / ITU-R BT1358 525 / ITU-R BT1700 NTSC
514 AVCOL_PRI_SMPTE240M =7, ///< functionally identical to above
516 AVCOL_PRI_NB , ///< Not part of ABI
519 enum AVColorTransferCharacteristic{
520 AVCOL_TRC_BT709 =1, ///< also ITU-R BT1361
521 AVCOL_TRC_UNSPECIFIED=2,
522 AVCOL_TRC_GAMMA22 =4, ///< also ITU-R BT470M / ITU-R BT1700 625 PAL & SECAM
523 AVCOL_TRC_GAMMA28 =5, ///< also ITU-R BT470BG
524 AVCOL_TRC_SMPTE240M =7,
525 AVCOL_TRC_NB , ///< Not part of ABI
530 AVCOL_SPC_BT709 =1, ///< also ITU-R BT1361 / IEC 61966-2-4 xvYCC709 / SMPTE RP177 Annex B
531 AVCOL_SPC_UNSPECIFIED=2,
533 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
534 AVCOL_SPC_SMPTE170M =6, ///< also ITU-R BT601-6 525 / ITU-R BT1358 525 / ITU-R BT1700 NTSC / functionally identical to above
535 AVCOL_SPC_SMPTE240M =7,
537 AVCOL_SPC_NB , ///< Not part of ABI
541 AVCOL_RANGE_UNSPECIFIED=0,
542 AVCOL_RANGE_MPEG =1, ///< the normal 219*2^(n-8) "MPEG" YUV ranges
543 AVCOL_RANGE_JPEG =2, ///< the normal 2^n-1 "JPEG" YUV ranges
544 AVCOL_RANGE_NB , ///< Not part of ABI
548 * X X 3 4 X X are luma samples,
549 * 1 2 1-6 are possible chroma positions
550 * X X 5 6 X 0 is undefined/unknown position
552 enum AVChromaLocation{
553 AVCHROMA_LOC_UNSPECIFIED=0,
554 AVCHROMA_LOC_LEFT =1, ///< mpeg2/4, h264 default
555 AVCHROMA_LOC_CENTER =2, ///< mpeg1, jpeg, h263
556 AVCHROMA_LOC_TOPLEFT =3, ///< DV
558 AVCHROMA_LOC_BOTTOMLEFT =5,
559 AVCHROMA_LOC_BOTTOM =6,
560 AVCHROMA_LOC_NB , ///< Not part of ABI
563 #if FF_API_FLAC_GLOBAL_OPTS
568 AV_LPC_TYPE_DEFAULT = -1, ///< use the codec default LPC type
569 AV_LPC_TYPE_NONE = 0, ///< do not use LPC prediction or use all zero coefficients
570 AV_LPC_TYPE_FIXED = 1, ///< fixed LPC coefficients
571 AV_LPC_TYPE_LEVINSON = 2, ///< Levinson-Durbin recursion
572 AV_LPC_TYPE_CHOLESKY = 3, ///< Cholesky factorization
573 AV_LPC_TYPE_NB , ///< Not part of ABI
577 enum AVAudioServiceType {
578 AV_AUDIO_SERVICE_TYPE_MAIN = 0,
579 AV_AUDIO_SERVICE_TYPE_EFFECTS = 1,
580 AV_AUDIO_SERVICE_TYPE_VISUALLY_IMPAIRED = 2,
581 AV_AUDIO_SERVICE_TYPE_HEARING_IMPAIRED = 3,
582 AV_AUDIO_SERVICE_TYPE_DIALOGUE = 4,
583 AV_AUDIO_SERVICE_TYPE_COMMENTARY = 5,
584 AV_AUDIO_SERVICE_TYPE_EMERGENCY = 6,
585 AV_AUDIO_SERVICE_TYPE_VOICE_OVER = 7,
586 AV_AUDIO_SERVICE_TYPE_KARAOKE = 8,
587 AV_AUDIO_SERVICE_TYPE_NB , ///< Not part of ABI
590 typedef struct RcOverride{
593 int qscale; // If this is 0 then quality_factor will be used instead.
594 float quality_factor;
597 #define FF_MAX_B_FRAMES 16
600 These flags can be passed in AVCodecContext.flags before initialization.
601 Note: Not everything is supported yet.
604 #define CODEC_FLAG_QSCALE 0x0002 ///< Use fixed qscale.
605 #define CODEC_FLAG_4MV 0x0004 ///< 4 MV per MB allowed / advanced prediction for H.263.
606 #define CODEC_FLAG_QPEL 0x0010 ///< Use qpel MC.
607 #define CODEC_FLAG_GMC 0x0020 ///< Use GMC.
608 #define CODEC_FLAG_MV0 0x0040 ///< Always try a MB with MV=<0,0>.
610 * The parent program guarantees that the input for B-frames containing
611 * streams is not written to for at least s->max_b_frames+1 frames, if
612 * this is not set the input will be copied.
614 #define CODEC_FLAG_INPUT_PRESERVED 0x0100
615 #define CODEC_FLAG_PASS1 0x0200 ///< Use internal 2pass ratecontrol in first pass mode.
616 #define CODEC_FLAG_PASS2 0x0400 ///< Use internal 2pass ratecontrol in second pass mode.
617 #define CODEC_FLAG_GRAY 0x2000 ///< Only decode/encode grayscale.
618 #define CODEC_FLAG_EMU_EDGE 0x4000 ///< Don't draw edges.
619 #define CODEC_FLAG_PSNR 0x8000 ///< error[?] variables will be set during encoding.
620 #define CODEC_FLAG_TRUNCATED 0x00010000 /** Input bitstream might be truncated at a random
621 location instead of only at frame boundaries. */
622 #define CODEC_FLAG_NORMALIZE_AQP 0x00020000 ///< Normalize adaptive quantization.
623 #define CODEC_FLAG_INTERLACED_DCT 0x00040000 ///< Use interlaced DCT.
624 #define CODEC_FLAG_LOW_DELAY 0x00080000 ///< Force low delay.
625 #define CODEC_FLAG_GLOBAL_HEADER 0x00400000 ///< Place global headers in extradata instead of every keyframe.
626 #define CODEC_FLAG_BITEXACT 0x00800000 ///< Use only bitexact stuff (except (I)DCT).
627 /* Fx : Flag for h263+ extra options */
628 #define CODEC_FLAG_AC_PRED 0x01000000 ///< H.263 advanced intra coding / MPEG-4 AC prediction
629 #define CODEC_FLAG_CBP_RD 0x04000000 ///< Use rate distortion optimization for cbp.
630 #define CODEC_FLAG_QP_RD 0x08000000 ///< Use rate distortion optimization for qp selectioon.
631 #define CODEC_FLAG_LOOP_FILTER 0x00000800 ///< loop filter
632 #define CODEC_FLAG_INTERLACED_ME 0x20000000 ///< interlaced motion estimation
633 #define CODEC_FLAG_CLOSED_GOP 0x80000000
634 #define CODEC_FLAG2_FAST 0x00000001 ///< Allow non spec compliant speedup tricks.
635 #define CODEC_FLAG2_STRICT_GOP 0x00000002 ///< Strictly enforce GOP size.
636 #define CODEC_FLAG2_NO_OUTPUT 0x00000004 ///< Skip bitstream encoding.
637 #define CODEC_FLAG2_LOCAL_HEADER 0x00000008 ///< Place global headers at every keyframe instead of in extradata.
638 #define CODEC_FLAG2_SKIP_RD 0x00004000 ///< RD optimal MB level residual skipping
639 #define CODEC_FLAG2_CHUNKS 0x00008000 ///< Input bitstream might be truncated at a packet boundaries instead of only at frame boundaries.
640 #define CODEC_FLAG2_SHOW_ALL 0x00400000 ///< Show all frames before the first keyframe
642 * @defgroup deprecated_flags Deprecated codec flags
643 * Use corresponding private codec options instead.
646 #if FF_API_MPEGVIDEO_GLOBAL_OPTS
647 #define CODEC_FLAG_OBMC 0x00000001 ///< OBMC
648 #define CODEC_FLAG_H263P_AIV 0x00000008 ///< H.263 alternative inter VLC
649 #define CODEC_FLAG_PART 0x0080 ///< Use data partitioning.
650 #define CODEC_FLAG_ALT_SCAN 0x00100000 ///< Use alternate scan.
651 #define CODEC_FLAG_H263P_UMV 0x02000000 ///< unlimited motion vector
652 #define CODEC_FLAG_H263P_SLICE_STRUCT 0x10000000
653 #define CODEC_FLAG_SVCD_SCAN_OFFSET 0x40000000 ///< Will reserve space for SVCD scan offset user data.
654 #define CODEC_FLAG2_INTRA_VLC 0x00000800 ///< Use MPEG-2 intra VLC table.
655 #define CODEC_FLAG2_DROP_FRAME_TIMECODE 0x00002000 ///< timecode is in drop frame format.
656 #define CODEC_FLAG2_NON_LINEAR_QUANT 0x00010000 ///< Use MPEG-2 nonlinear quantizer.
658 #if FF_API_MJPEG_GLOBAL_OPTS
659 #define CODEC_FLAG_EXTERN_HUFF 0x1000 ///< Use external Huffman table (for MJPEG).
661 #if FF_API_X264_GLOBAL_OPTS
662 #define CODEC_FLAG2_BPYRAMID 0x00000010 ///< H.264 allow B-frames to be used as references.
663 #define CODEC_FLAG2_WPRED 0x00000020 ///< H.264 weighted biprediction for B-frames
664 #define CODEC_FLAG2_MIXED_REFS 0x00000040 ///< H.264 one reference per partition, as opposed to one reference per macroblock
665 #define CODEC_FLAG2_8X8DCT 0x00000080 ///< H.264 high profile 8x8 transform
666 #define CODEC_FLAG2_FASTPSKIP 0x00000100 ///< H.264 fast pskip
667 #define CODEC_FLAG2_AUD 0x00000200 ///< H.264 access unit delimiters
668 #define CODEC_FLAG2_BRDO 0x00000400 ///< B-frame rate-distortion optimization
669 #define CODEC_FLAG2_MBTREE 0x00040000 ///< Use macroblock tree ratecontrol (x264 only)
670 #define CODEC_FLAG2_PSY 0x00080000 ///< Use psycho visual optimizations.
671 #define CODEC_FLAG2_SSIM 0x00100000 ///< Compute SSIM during encoding, error[] values are undefined.
672 #define CODEC_FLAG2_INTRA_REFRESH 0x00200000 ///< Use periodic insertion of intra blocks instead of keyframes.
674 #if FF_API_SNOW_GLOBAL_OPTS
675 #define CODEC_FLAG2_MEMC_ONLY 0x00001000 ///< Only do ME/MC (I frames -> ref, P frame -> ME+MC).
677 #if FF_API_LAME_GLOBAL_OPTS
678 #define CODEC_FLAG2_BIT_RESERVOIR 0x00020000 ///< Use a bit reservoir when encoding if possible
684 /* Unsupported options :
685 * Syntax Arithmetic coding (SAC)
686 * Reference Picture Selection
687 * Independent Segment Decoding */
689 /* codec capabilities */
691 #define CODEC_CAP_DRAW_HORIZ_BAND 0x0001 ///< Decoder can use draw_horiz_band callback.
693 * Codec uses get_buffer() for allocating buffers and supports custom allocators.
694 * If not set, it might not use get_buffer() at all or use operations that
695 * assume the buffer was allocated by avcodec_default_get_buffer.
697 #define CODEC_CAP_DR1 0x0002
698 #if FF_API_PARSE_FRAME
699 /* If 'parse_only' field is true, then avcodec_parse_frame() can be used. */
700 #define CODEC_CAP_PARSE_ONLY 0x0004
702 #define CODEC_CAP_TRUNCATED 0x0008
703 /* Codec can export data for HW decoding (XvMC). */
704 #define CODEC_CAP_HWACCEL 0x0010
706 * Codec has a nonzero delay and needs to be fed with avpkt->data=NULL,
707 * avpkt->size=0 at the end to get the delayed data until the decoder no longer
708 * returns frames. If this is not set, the codec is guaranteed to never be fed
711 #define CODEC_CAP_DELAY 0x0020
713 * Codec can be fed a final frame with a smaller size.
714 * This can be used to prevent truncation of the last audio samples.
716 #define CODEC_CAP_SMALL_LAST_FRAME 0x0040
718 * Codec can export data for HW decoding (VDPAU).
720 #define CODEC_CAP_HWACCEL_VDPAU 0x0080
722 * Codec can output multiple frames per AVPacket
723 * Normally demuxers return one frame at a time, demuxers which do not do
724 * are connected to a parser to split what they return into proper frames.
725 * This flag is reserved to the very rare category of codecs which have a
726 * bitstream that cannot be split into frames without timeconsuming
727 * operations like full decoding. Demuxers carring such bitstreams thus
728 * may return multiple frames in a packet. This has many disadvantages like
729 * prohibiting stream copy in many cases thus it should only be considered
732 #define CODEC_CAP_SUBFRAMES 0x0100
734 * Codec is experimental and is thus avoided in favor of non experimental
737 #define CODEC_CAP_EXPERIMENTAL 0x0200
739 * Codec should fill in channel configuration and samplerate instead of container
741 #define CODEC_CAP_CHANNEL_CONF 0x0400
744 * Codec is able to deal with negative linesizes
746 #define CODEC_CAP_NEG_LINESIZES 0x0800
749 * Codec supports frame-level multithreading.
751 #define CODEC_CAP_FRAME_THREADS 0x1000
753 * Codec supports slice-based (or partition-based) multithreading.
755 #define CODEC_CAP_SLICE_THREADS 0x2000
759 #define CODEC_CAP_LOSSLESS 0x80000000
761 //The following defines may change, don't expect compatibility if you use them.
762 #define MB_TYPE_INTRA4x4 0x0001
763 #define MB_TYPE_INTRA16x16 0x0002 //FIXME H.264-specific
764 #define MB_TYPE_INTRA_PCM 0x0004 //FIXME H.264-specific
765 #define MB_TYPE_16x16 0x0008
766 #define MB_TYPE_16x8 0x0010
767 #define MB_TYPE_8x16 0x0020
768 #define MB_TYPE_8x8 0x0040
769 #define MB_TYPE_INTERLACED 0x0080
770 #define MB_TYPE_DIRECT2 0x0100 //FIXME
771 #define MB_TYPE_ACPRED 0x0200
772 #define MB_TYPE_GMC 0x0400
773 #define MB_TYPE_SKIP 0x0800
774 #define MB_TYPE_P0L0 0x1000
775 #define MB_TYPE_P1L0 0x2000
776 #define MB_TYPE_P0L1 0x4000
777 #define MB_TYPE_P1L1 0x8000
778 #define MB_TYPE_L0 (MB_TYPE_P0L0 | MB_TYPE_P1L0)
779 #define MB_TYPE_L1 (MB_TYPE_P0L1 | MB_TYPE_P1L1)
780 #define MB_TYPE_L0L1 (MB_TYPE_L0 | MB_TYPE_L1)
781 #define MB_TYPE_QUANT 0x00010000
782 #define MB_TYPE_CBP 0x00020000
783 //Note bits 24-31 are reserved for codec specific use (h264 ref0, mpeg1 0mv, ...)
787 * This specifies the area which should be displayed.
788 * Note there may be multiple such areas for one frame.
790 typedef struct AVPanScan{
793 * - encoding: Set by user.
794 * - decoding: Set by libavcodec.
799 * width and height in 1/16 pel
800 * - encoding: Set by user.
801 * - decoding: Set by libavcodec.
807 * position of the top left corner in 1/16 pel for up to 3 fields/frames
808 * - encoding: Set by user.
809 * - decoding: Set by libavcodec.
811 int16_t position[3][2];
814 #define FF_QSCALE_TYPE_MPEG1 0
815 #define FF_QSCALE_TYPE_MPEG2 1
816 #define FF_QSCALE_TYPE_H264 2
817 #define FF_QSCALE_TYPE_VP56 3
819 #define FF_BUFFER_TYPE_INTERNAL 1
820 #define FF_BUFFER_TYPE_USER 2 ///< direct rendering buffers (image is (de)allocated by user)
821 #define FF_BUFFER_TYPE_SHARED 4 ///< Buffer from somewhere else; don't deallocate image (data/base), all other tables are not shared.
822 #define FF_BUFFER_TYPE_COPY 8 ///< Just a (modified) copy of some other buffer, don't deallocate anything.
824 #if FF_API_OLD_FF_PICT_TYPES
825 /* DEPRECATED, directly use the AV_PICTURE_TYPE_* enum values */
826 #define FF_I_TYPE AV_PICTURE_TYPE_I ///< Intra
827 #define FF_P_TYPE AV_PICTURE_TYPE_P ///< Predicted
828 #define FF_B_TYPE AV_PICTURE_TYPE_B ///< Bi-dir predicted
829 #define FF_S_TYPE AV_PICTURE_TYPE_S ///< S(GMC)-VOP MPEG4
830 #define FF_SI_TYPE AV_PICTURE_TYPE_SI ///< Switching Intra
831 #define FF_SP_TYPE AV_PICTURE_TYPE_SP ///< Switching Predicted
832 #define FF_BI_TYPE AV_PICTURE_TYPE_BI
835 #define FF_BUFFER_HINTS_VALID 0x01 // Buffer hints value is meaningful (if 0 ignore).
836 #define FF_BUFFER_HINTS_READABLE 0x02 // Codec will read from buffer.
837 #define FF_BUFFER_HINTS_PRESERVE 0x04 // User must not alter buffer content.
838 #define FF_BUFFER_HINTS_REUSABLE 0x08 // Codec will reuse the buffer (update).
840 enum AVPacketSideDataType {
844 typedef struct AVPacket {
846 * Presentation timestamp in AVStream->time_base units; the time at which
847 * the decompressed packet will be presented to the user.
848 * Can be AV_NOPTS_VALUE if it is not stored in the file.
849 * pts MUST be larger or equal to dts as presentation cannot happen before
850 * decompression, unless one wants to view hex dumps. Some formats misuse
851 * the terms dts and pts/cts to mean something different. Such timestamps
852 * must be converted to true pts/dts before they are stored in AVPacket.
856 * Decompression timestamp in AVStream->time_base units; the time at which
857 * the packet is decompressed.
858 * Can be AV_NOPTS_VALUE if it is not stored in the file.
865 * A combination of AV_PKT_FLAG values
869 * Additional packet data that can be provided by the container.
870 * Packet can contain several types of side information.
875 enum AVPacketSideDataType type;
880 * Duration of this packet in AVStream->time_base units, 0 if unknown.
881 * Equals next_pts - this_pts in presentation order.
884 void (*destruct)(struct AVPacket *);
886 int64_t pos; ///< byte position in stream, -1 if unknown
889 * Time difference in AVStream->time_base units from the pts of this
890 * packet to the point at which the output from the decoder has converged
891 * independent from the availability of previous frames. That is, the
892 * frames are virtually identical no matter if decoding started from
893 * the very first frame or from this keyframe.
894 * Is AV_NOPTS_VALUE if unknown.
895 * This field is not the display duration of the current packet.
896 * This field has no meaning if the packet does not have AV_PKT_FLAG_KEY
899 * The purpose of this field is to allow seeking in streams that have no
900 * keyframes in the conventional sense. It corresponds to the
901 * recovery point SEI in H.264 and match_time_delta in NUT. It is also
902 * essential for some types of subtitle streams to ensure that all
903 * subtitles are correctly displayed after seeking.
905 int64_t convergence_duration;
907 #define AV_PKT_FLAG_KEY 0x0001 ///< The packet contains a keyframe
908 #define AV_PKT_FLAG_CORRUPT 0x0002 ///< The packet content is corrupted
912 * New fields can be added to the end of AVFRAME with minor version
913 * bumps. Removal, reordering and changes to existing fields require
914 * a major version bump.
915 * sizeof(AVFrame) must not be used outside libav*.
917 typedef struct AVFrame {
919 * pointer to the picture planes.
920 * This might be different from the first allocated byte
927 * pointer to the first allocated byte of the picture. Can be used in get_buffer/release_buffer.
928 * This isn't used by libavcodec unless the default get/release_buffer() is used.
934 * 1 -> keyframe, 0-> not
935 * - encoding: Set by libavcodec.
936 * - decoding: Set by libavcodec.
941 * Picture type of the frame, see ?_TYPE below.
942 * - encoding: Set by libavcodec. for coded_picture (and set by user for input).
943 * - decoding: Set by libavcodec.
945 enum AVPictureType pict_type;
948 * presentation timestamp in time_base units (time when frame should be shown to user)
949 * If AV_NOPTS_VALUE then frame_rate = 1/time_base will be assumed.
950 * - encoding: MUST be set by user.
951 * - decoding: Set by libavcodec.
956 * picture number in bitstream order
958 * - decoding: Set by libavcodec.
960 int coded_picture_number;
962 * picture number in display order
964 * - decoding: Set by libavcodec.
966 int display_picture_number;
969 * quality (between 1 (good) and FF_LAMBDA_MAX (bad))
970 * - encoding: Set by libavcodec. for coded_picture (and set by user for input).
971 * - decoding: Set by libavcodec.
976 * buffer age (1->was last buffer and dint change, 2->..., ...).
977 * Set to INT_MAX if the buffer has not been used yet.
979 * - decoding: MUST be set by get_buffer().
984 * is this picture used as reference
985 * The values for this are the same as the MpegEncContext.picture_structure
986 * variable, that is 1->top field, 2->bottom field, 3->frame/both fields.
987 * Set to 4 for delayed, non-reference frames.
989 * - decoding: Set by libavcodec. (before get_buffer() call)).
996 * - decoding: Set by libavcodec.
998 int8_t *qscale_table;
1001 * - encoding: unused
1002 * - decoding: Set by libavcodec.
1007 * mbskip_table[mb]>=1 if MB didn't change
1008 * stride= mb_width = (width+15)>>4
1009 * - encoding: unused
1010 * - decoding: Set by libavcodec.
1012 uint8_t *mbskip_table;
1015 * motion vector table
1018 * int mv_sample_log2= 4 - motion_subsample_log2;
1019 * int mb_width= (width+15)>>4;
1020 * int mv_stride= (mb_width << mv_sample_log2) + 1;
1021 * motion_val[direction][x + y*mv_stride][0->mv_x, 1->mv_y];
1023 * - encoding: Set by user.
1024 * - decoding: Set by libavcodec.
1026 int16_t (*motion_val[2])[2];
1029 * macroblock type table
1030 * mb_type_base + mb_width + 2
1031 * - encoding: Set by user.
1032 * - decoding: Set by libavcodec.
1037 * log2 of the size of the block which a single vector in motion_val represents:
1038 * (4->16x16, 3->8x8, 2-> 4x4, 1-> 2x2)
1039 * - encoding: unused
1040 * - decoding: Set by libavcodec.
1042 uint8_t motion_subsample_log2;
1045 * for some private data of the user
1046 * - encoding: unused
1047 * - decoding: Set by user.
1053 * - encoding: Set by libavcodec. if flags&CODEC_FLAG_PSNR.
1054 * - decoding: unused
1059 * type of the buffer (to keep track of who has to deallocate data[*])
1060 * - encoding: Set by the one who allocates it.
1061 * - decoding: Set by the one who allocates it.
1062 * Note: User allocated (direct rendering) & internal buffers cannot coexist currently.
1067 * When decoding, this signals how much the picture must be delayed.
1068 * extra_delay = repeat_pict / (2*fps)
1069 * - encoding: unused
1070 * - decoding: Set by libavcodec.
1080 * The content of the picture is interlaced.
1081 * - encoding: Set by user.
1082 * - decoding: Set by libavcodec. (default 0)
1084 int interlaced_frame;
1087 * If the content is interlaced, is top field displayed first.
1088 * - encoding: Set by user.
1089 * - decoding: Set by libavcodec.
1091 int top_field_first;
1095 * - encoding: Set by user.
1096 * - decoding: Set by libavcodec.
1098 AVPanScan *pan_scan;
1101 * Tell user application that palette has changed from previous frame.
1102 * - encoding: ??? (no palette-enabled encoder yet)
1103 * - decoding: Set by libavcodec. (default 0).
1105 int palette_has_changed;
1108 * codec suggestion on buffer type if != 0
1109 * - encoding: unused
1110 * - decoding: Set by libavcodec. (before get_buffer() call)).
1116 * - encoding: unused
1117 * - decoding: Set by libavcodec.
1122 * motion reference frame index
1123 * the order in which these are stored can depend on the codec.
1124 * - encoding: Set by user.
1125 * - decoding: Set by libavcodec.
1127 int8_t *ref_index[2];
1130 * reordered opaque 64bit (generally an integer or a double precision float
1131 * PTS but can be anything).
1132 * The user sets AVCodecContext.reordered_opaque to represent the input at
1134 * the decoder reorders values as needed and sets AVFrame.reordered_opaque
1135 * to exactly one of the values provided by the user through AVCodecContext.reordered_opaque
1136 * @deprecated in favor of pkt_pts
1137 * - encoding: unused
1138 * - decoding: Read by user.
1140 int64_t reordered_opaque;
1143 * hardware accelerator private data (FFmpeg-allocated)
1144 * - encoding: unused
1145 * - decoding: Set by libavcodec
1147 void *hwaccel_picture_private;
1150 * reordered pts from the last AVPacket that has been input into the decoder
1151 * - encoding: unused
1152 * - decoding: Read by user.
1157 * dts from the last AVPacket that has been input into the decoder
1158 * - encoding: unused
1159 * - decoding: Read by user.
1164 * the AVCodecContext which ff_thread_get_buffer() was last called on
1165 * - encoding: Set by libavcodec.
1166 * - decoding: Set by libavcodec.
1168 struct AVCodecContext *owner;
1171 * used by multithreading to store frame-specific info
1172 * - encoding: Set by libavcodec.
1173 * - decoding: Set by libavcodec.
1175 void *thread_opaque;
1178 * frame timestamp estimated using various heuristics, in stream time base
1179 * - encoding: unused
1180 * - decoding: set by libavcodec, read by user.
1182 int64_t best_effort_timestamp;
1185 * reordered pos from the last AVPacket that has been input into the decoder
1186 * - encoding: unused
1187 * - decoding: Read by user.
1192 * reordered sample aspect ratio for the video frame, 0/1 if unknown\unspecified
1193 * - encoding: unused
1194 * - decoding: Read by user.
1196 AVRational sample_aspect_ratio;
1199 * width and height of the video frame
1200 * - encoding: unused
1201 * - decoding: Read by user.
1206 * format of the frame, -1 if unknown or unset
1207 * It should be cast to the corresponding enum (enum PixelFormat
1208 * for video, enum AVSampleFormat for audio)
1209 * - encoding: unused
1210 * - decoding: Read by user.
1217 * main external API structure.
1218 * New fields can be added to the end with minor version bumps.
1219 * Removal, reordering and changes to existing fields require a major
1221 * Please use AVOptions (av_opt* / av_set/get*()) to access these fields from user
1223 * sizeof(AVCodecContext) must not be used outside libav*.
1225 typedef struct AVCodecContext {
1227 * information on struct for av_log
1228 * - set by avcodec_alloc_context
1230 const AVClass *av_class;
1232 * the average bitrate
1233 * - encoding: Set by user; unused for constant quantizer encoding.
1234 * - decoding: Set by libavcodec. 0 or some bitrate if this info is available in the stream.
1239 * number of bits the bitstream is allowed to diverge from the reference.
1240 * the reference can be CBR (for CBR pass1) or VBR (for pass2)
1241 * - encoding: Set by user; unused for constant quantizer encoding.
1242 * - decoding: unused
1244 int bit_rate_tolerance;
1248 * - encoding: Set by user.
1249 * - decoding: Set by user.
1254 * Some codecs need additional format info. It is stored here.
1255 * If any muxer uses this then ALL demuxers/parsers AND encoders for the
1256 * specific codec MUST set it correctly otherwise stream copy breaks.
1257 * In general use of this field by muxers is not recommanded.
1258 * - encoding: Set by libavcodec.
1259 * - decoding: Set by libavcodec. (FIXME: Is this OK?)
1264 * Motion estimation algorithm used for video coding.
1265 * 1 (zero), 2 (full), 3 (log), 4 (phods), 5 (epzs), 6 (x1), 7 (hex),
1266 * 8 (umh), 9 (iter), 10 (tesa) [7, 8, 10 are x264 specific, 9 is snow specific]
1267 * - encoding: MUST be set by user.
1268 * - decoding: unused
1273 * some codecs need / can use extradata like Huffman tables.
1274 * mjpeg: Huffman tables
1275 * rv10: additional flags
1276 * mpeg4: global headers (they can be in the bitstream or here)
1277 * The allocated memory should be FF_INPUT_BUFFER_PADDING_SIZE bytes larger
1278 * than extradata_size to avoid prolems if it is read with the bitstream reader.
1279 * The bytewise contents of extradata must not depend on the architecture or CPU endianness.
1280 * - encoding: Set/allocated/freed by libavcodec.
1281 * - decoding: Set/allocated/freed by user.
1287 * This is the fundamental unit of time (in seconds) in terms
1288 * of which frame timestamps are represented. For fixed-fps content,
1289 * timebase should be 1/framerate and timestamp increments should be
1291 * - encoding: MUST be set by user.
1292 * - decoding: Set by libavcodec.
1294 AVRational time_base;
1298 * picture width / height.
1299 * - encoding: MUST be set by user.
1300 * - decoding: Set by libavcodec.
1301 * Note: For compatibility it is possible to set this instead of
1302 * coded_width/height before decoding.
1306 #define FF_ASPECT_EXTENDED 15
1309 * the number of pictures in a group of pictures, or 0 for intra_only
1310 * - encoding: Set by user.
1311 * - decoding: unused
1316 * Pixel format, see PIX_FMT_xxx.
1317 * May be set by the demuxer if known from headers.
1318 * May be overriden by the decoder if it knows better.
1319 * - encoding: Set by user.
1320 * - decoding: Set by user if known, overridden by libavcodec if known
1322 enum PixelFormat pix_fmt;
1325 * If non NULL, 'draw_horiz_band' is called by the libavcodec
1326 * decoder to draw a horizontal band. It improves cache usage. Not
1327 * all codecs can do that. You must check the codec capabilities
1329 * When multithreading is used, it may be called from multiple threads
1330 * at the same time; threads might draw different parts of the same AVFrame,
1331 * or multiple AVFrames, and there is no guarantee that slices will be drawn
1333 * The function is also used by hardware acceleration APIs.
1334 * It is called at least once during frame decoding to pass
1335 * the data needed for hardware render.
1336 * In that mode instead of pixel data, AVFrame points to
1337 * a structure specific to the acceleration API. The application
1338 * reads the structure and can change some fields to indicate progress
1340 * - encoding: unused
1341 * - decoding: Set by user.
1342 * @param height the height of the slice
1343 * @param y the y position of the slice
1344 * @param type 1->top field, 2->bottom field, 3->frame
1345 * @param offset offset into the AVFrame.data from which the slice should be read
1347 void (*draw_horiz_band)(struct AVCodecContext *s,
1348 const AVFrame *src, int offset[4],
1349 int y, int type, int height);
1352 int sample_rate; ///< samples per second
1353 int channels; ///< number of audio channels
1356 * audio sample format
1357 * - encoding: Set by user.
1358 * - decoding: Set by libavcodec.
1360 enum AVSampleFormat sample_fmt; ///< sample format
1362 /* The following data should not be initialized. */
1364 * Samples per packet, initialized when calling 'init'.
1367 int frame_number; ///< audio or video frame number
1370 * Number of frames the decoded output will be delayed relative to
1371 * the encoded input.
1372 * - encoding: Set by libavcodec.
1373 * - decoding: unused
1377 /* - encoding parameters */
1378 float qcompress; ///< amount of qscale change between easy & hard scenes (0.0-1.0)
1379 float qblur; ///< amount of qscale smoothing over time (0.0-1.0)
1383 * - encoding: Set by user.
1384 * - decoding: unused
1390 * - encoding: Set by user.
1391 * - decoding: unused
1396 * maximum quantizer difference between frames
1397 * - encoding: Set by user.
1398 * - decoding: unused
1403 * maximum number of B-frames between non-B-frames
1404 * Note: The output will be delayed by max_b_frames+1 relative to the input.
1405 * - encoding: Set by user.
1406 * - decoding: unused
1411 * qscale factor between IP and B-frames
1412 * If > 0 then the last P-frame quantizer will be used (q= lastp_q*factor+offset).
1413 * If < 0 then normal ratecontrol will be done (q= -normal_q*factor+offset).
1414 * - encoding: Set by user.
1415 * - decoding: unused
1417 float b_quant_factor;
1419 /** obsolete FIXME remove */
1421 #define FF_RC_STRATEGY_XVID 1
1423 int b_frame_strategy;
1425 struct AVCodec *codec;
1429 int rtp_payload_size; /* The size of the RTP payload: the coder will */
1430 /* do its best to deliver a chunk with size */
1431 /* below rtp_payload_size, the chunk will start */
1432 /* with a start code on some codecs like H.263. */
1433 /* This doesn't take account of any particular */
1434 /* headers inside the transmitted RTP payload. */
1437 /* The RTP callback: This function is called */
1438 /* every time the encoder has a packet to send. */
1439 /* It depends on the encoder if the data starts */
1440 /* with a Start Code (it should). H.263 does. */
1441 /* mb_nb contains the number of macroblocks */
1442 /* encoded in the RTP payload. */
1443 void (*rtp_callback)(struct AVCodecContext *avctx, void *data, int size, int mb_nb);
1445 /* statistics, used for 2-pass encoding */
1456 * number of bits used for the previously encoded frame
1457 * - encoding: Set by libavcodec.
1458 * - decoding: unused
1463 * Private data of the user, can be used to carry app specific stuff.
1464 * - encoding: Set by user.
1465 * - decoding: Set by user.
1469 char codec_name[32];
1470 enum AVMediaType codec_type; /* see AVMEDIA_TYPE_xxx */
1471 enum CodecID codec_id; /* see CODEC_ID_xxx */
1474 * fourcc (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A').
1475 * This is used to work around some encoder bugs.
1476 * A demuxer should set this to what is stored in the field used to identify the codec.
1477 * If there are multiple such fields in a container then the demuxer should choose the one
1478 * which maximizes the information about the used codec.
1479 * If the codec tag field in a container is larger than 32 bits then the demuxer should
1480 * remap the longer ID to 32 bits with a table or other structure. Alternatively a new
1481 * extra_codec_tag + size could be added but for this a clear advantage must be demonstrated
1483 * - encoding: Set by user, if not then the default based on codec_id will be used.
1484 * - decoding: Set by user, will be converted to uppercase by libavcodec during init.
1486 unsigned int codec_tag;
1489 * Work around bugs in encoders which sometimes cannot be detected automatically.
1490 * - encoding: Set by user
1491 * - decoding: Set by user
1493 int workaround_bugs;
1494 #define FF_BUG_AUTODETECT 1 ///< autodetection
1495 #define FF_BUG_OLD_MSMPEG4 2
1496 #define FF_BUG_XVID_ILACE 4
1497 #define FF_BUG_UMP4 8
1498 #define FF_BUG_NO_PADDING 16
1499 #define FF_BUG_AMV 32
1500 #define FF_BUG_AC_VLC 0 ///< Will be removed, libavcodec can now handle these non-compliant files by default.
1501 #define FF_BUG_QPEL_CHROMA 64
1502 #define FF_BUG_STD_QPEL 128
1503 #define FF_BUG_QPEL_CHROMA2 256
1504 #define FF_BUG_DIRECT_BLOCKSIZE 512
1505 #define FF_BUG_EDGE 1024
1506 #define FF_BUG_HPEL_CHROMA 2048
1507 #define FF_BUG_DC_CLIP 4096
1508 #define FF_BUG_MS 8192 ///< Work around various bugs in Microsoft's broken decoders.
1509 #define FF_BUG_TRUNCATED 16384
1510 //#define FF_BUG_FAKE_SCALABILITY 16 //Autodetection should work 100%.
1513 * luma single coefficient elimination threshold
1514 * - encoding: Set by user.
1515 * - decoding: unused
1517 int luma_elim_threshold;
1520 * chroma single coeff elimination threshold
1521 * - encoding: Set by user.
1522 * - decoding: unused
1524 int chroma_elim_threshold;
1527 * strictly follow the standard (MPEG4, ...).
1528 * - encoding: Set by user.
1529 * - decoding: Set by user.
1530 * Setting this to STRICT or higher means the encoder and decoder will
1531 * generally do stupid things, whereas setting it to unofficial or lower
1532 * will mean the encoder might produce output that is not supported by all
1533 * spec-compliant decoders. Decoders don't differentiate between normal,
1534 * unofficial and experimental (that is, they always try to decode things
1535 * when they can) unless they are explicitly asked to behave stupidly
1536 * (=strictly conform to the specs)
1538 int strict_std_compliance;
1539 #define FF_COMPLIANCE_VERY_STRICT 2 ///< Strictly conform to an older more strict version of the spec or reference software.
1540 #define FF_COMPLIANCE_STRICT 1 ///< Strictly conform to all the things in the spec no matter what consequences.
1541 #define FF_COMPLIANCE_NORMAL 0
1542 #define FF_COMPLIANCE_UNOFFICIAL -1 ///< Allow unofficial extensions
1543 #define FF_COMPLIANCE_EXPERIMENTAL -2 ///< Allow nonstandardized experimental things.
1546 * qscale offset between IP and B-frames
1547 * - encoding: Set by user.
1548 * - decoding: unused
1550 float b_quant_offset;
1554 * Error recognition; higher values will detect more errors but may
1555 * misdetect some more or less valid parts as errors.
1556 * - encoding: unused
1557 * - decoding: Set by user.
1559 attribute_deprecated int error_recognition;
1560 #define FF_ER_CAREFUL 1
1561 #define FF_ER_COMPLIANT 2
1562 #define FF_ER_AGGRESSIVE 3
1563 #define FF_ER_VERY_AGGRESSIVE 4
1564 #define FF_ER_EXPLODE 5
1565 #endif /* FF_API_ER */
1568 * Called at the beginning of each frame to get a buffer for it.
1569 * If pic.reference is set then the frame will be read later by libavcodec.
1570 * avcodec_align_dimensions2() should be used to find the required width and
1571 * height, as they normally need to be rounded up to the next multiple of 16.
1572 * if CODEC_CAP_DR1 is not set then get_buffer() must call
1573 * avcodec_default_get_buffer() instead of providing buffers allocated by
1575 * If frame multithreading is used and thread_safe_callbacks is set,
1576 * it may be called from a different thread, but not from more than one at once.
1577 * Does not need to be reentrant.
1578 * - encoding: unused
1579 * - decoding: Set by libavcodec, user can override.
1581 int (*get_buffer)(struct AVCodecContext *c, AVFrame *pic);
1584 * Called to release buffers which were allocated with get_buffer.
1585 * A released buffer can be reused in get_buffer().
1586 * pic.data[*] must be set to NULL.
1587 * May be called from a different thread if frame multithreading is used,
1588 * but not by more than one thread at once, so does not need to be reentrant.
1589 * - encoding: unused
1590 * - decoding: Set by libavcodec, user can override.
1592 void (*release_buffer)(struct AVCodecContext *c, AVFrame *pic);
1595 * Size of the frame reordering buffer in the decoder.
1596 * For MPEG-2 it is 1 IPB or 0 low delay IP.
1597 * - encoding: Set by libavcodec.
1598 * - decoding: Set by libavcodec.
1603 * number of bytes per packet if constant and known or 0
1604 * Used by some WAV based audio codecs.
1608 #if FF_API_PARSE_FRAME
1610 * If true, only parsing is done. The frame data is returned.
1611 * Only MPEG audio decoders support this now.
1612 * - encoding: unused
1613 * - decoding: Set by user
1615 attribute_deprecated int parse_only;
1619 * 0-> h263 quant 1-> mpeg quant
1620 * - encoding: Set by user.
1621 * - decoding: unused
1626 * pass1 encoding statistics output buffer
1627 * - encoding: Set by libavcodec.
1628 * - decoding: unused
1633 * pass2 encoding statistics input buffer
1634 * Concatenated stuff from stats_out of pass1 should be placed here.
1635 * - encoding: Allocated/set/freed by user.
1636 * - decoding: unused
1641 * ratecontrol qmin qmax limiting method
1642 * 0-> clipping, 1-> use a nice continous function to limit qscale wthin qmin/qmax.
1643 * - encoding: Set by user.
1644 * - decoding: unused
1652 * ratecontrol override, see RcOverride
1653 * - encoding: Allocated/set/freed by user.
1654 * - decoding: unused
1656 RcOverride *rc_override;
1657 int rc_override_count;
1660 * rate control equation
1661 * - encoding: Set by user
1662 * - decoding: unused
1668 * - encoding: Set by user.
1669 * - decoding: unused
1675 * - encoding: Set by user.
1676 * - decoding: unused
1681 * decoder bitstream buffer size
1682 * - encoding: Set by user.
1683 * - decoding: unused
1686 float rc_buffer_aggressivity;
1689 * qscale factor between P and I-frames
1690 * If > 0 then the last p frame quantizer will be used (q= lastp_q*factor+offset).
1691 * If < 0 then normal ratecontrol will be done (q= -normal_q*factor+offset).
1692 * - encoding: Set by user.
1693 * - decoding: unused
1695 float i_quant_factor;
1698 * qscale offset between P and I-frames
1699 * - encoding: Set by user.
1700 * - decoding: unused
1702 float i_quant_offset;
1705 * initial complexity for pass1 ratecontrol
1706 * - encoding: Set by user.
1707 * - decoding: unused
1709 float rc_initial_cplx;
1712 * DCT algorithm, see FF_DCT_* below
1713 * - encoding: Set by user.
1714 * - decoding: unused
1717 #define FF_DCT_AUTO 0
1718 #define FF_DCT_FASTINT 1
1719 #define FF_DCT_INT 2
1720 #define FF_DCT_MMX 3
1721 #define FF_DCT_MLIB 4
1722 #define FF_DCT_ALTIVEC 5
1723 #define FF_DCT_FAAN 6
1726 * luminance masking (0-> disabled)
1727 * - encoding: Set by user.
1728 * - decoding: unused
1733 * temporary complexity masking (0-> disabled)
1734 * - encoding: Set by user.
1735 * - decoding: unused
1737 float temporal_cplx_masking;
1740 * spatial complexity masking (0-> disabled)
1741 * - encoding: Set by user.
1742 * - decoding: unused
1744 float spatial_cplx_masking;
1747 * p block masking (0-> disabled)
1748 * - encoding: Set by user.
1749 * - decoding: unused
1754 * darkness masking (0-> disabled)
1755 * - encoding: Set by user.
1756 * - decoding: unused
1761 * IDCT algorithm, see FF_IDCT_* below.
1762 * - encoding: Set by user.
1763 * - decoding: Set by user.
1766 #define FF_IDCT_AUTO 0
1767 #define FF_IDCT_INT 1
1768 #define FF_IDCT_SIMPLE 2
1769 #define FF_IDCT_SIMPLEMMX 3
1770 #define FF_IDCT_LIBMPEG2MMX 4
1771 #define FF_IDCT_PS2 5
1772 #define FF_IDCT_MLIB 6
1773 #define FF_IDCT_ARM 7
1774 #define FF_IDCT_ALTIVEC 8
1775 #define FF_IDCT_SH4 9
1776 #define FF_IDCT_SIMPLEARM 10
1777 #define FF_IDCT_H264 11
1778 #define FF_IDCT_VP3 12
1779 #define FF_IDCT_IPP 13
1780 #define FF_IDCT_XVIDMMX 14
1781 #define FF_IDCT_CAVS 15
1782 #define FF_IDCT_SIMPLEARMV5TE 16
1783 #define FF_IDCT_SIMPLEARMV6 17
1784 #define FF_IDCT_SIMPLEVIS 18
1785 #define FF_IDCT_WMV2 19
1786 #define FF_IDCT_FAAN 20
1787 #define FF_IDCT_EA 21
1788 #define FF_IDCT_SIMPLENEON 22
1789 #define FF_IDCT_SIMPLEALPHA 23
1790 #define FF_IDCT_BINK 24
1794 * - encoding: Set by libavcodec.
1795 * - decoding: Set by user (or 0).
1799 * slice offsets in the frame in bytes
1800 * - encoding: Set/allocated by libavcodec.
1801 * - decoding: Set/allocated by user (or NULL).
1806 * error concealment flags
1807 * - encoding: unused
1808 * - decoding: Set by user.
1810 int error_concealment;
1811 #define FF_EC_GUESS_MVS 1
1812 #define FF_EC_DEBLOCK 2
1815 * dsp_mask could be add used to disable unwanted CPU features
1816 * CPU features (i.e. MMX, SSE. ...)
1818 * With the FORCE flag you may instead enable given CPU features.
1819 * (Dangerous: Usable in case of misdetection, improper usage however will
1820 * result into program crash.)
1825 * bits per sample/pixel from the demuxer (needed for huffyuv).
1826 * - encoding: Set by libavcodec.
1827 * - decoding: Set by user.
1829 int bits_per_coded_sample;
1832 * prediction method (needed for huffyuv)
1833 * - encoding: Set by user.
1834 * - decoding: unused
1836 int prediction_method;
1837 #define FF_PRED_LEFT 0
1838 #define FF_PRED_PLANE 1
1839 #define FF_PRED_MEDIAN 2
1842 * sample aspect ratio (0 if unknown)
1843 * That is the width of a pixel divided by the height of the pixel.
1844 * Numerator and denominator must be relatively prime and smaller than 256 for some video standards.
1845 * - encoding: Set by user.
1846 * - decoding: Set by libavcodec.
1848 AVRational sample_aspect_ratio;
1851 * the picture in the bitstream
1852 * - encoding: Set by libavcodec.
1853 * - decoding: Set by libavcodec.
1855 AVFrame *coded_frame;
1859 * - encoding: Set by user.
1860 * - decoding: Set by user.
1863 #define FF_DEBUG_PICT_INFO 1
1864 #define FF_DEBUG_RC 2
1865 #define FF_DEBUG_BITSTREAM 4
1866 #define FF_DEBUG_MB_TYPE 8
1867 #define FF_DEBUG_QP 16
1868 #define FF_DEBUG_MV 32
1869 #define FF_DEBUG_DCT_COEFF 0x00000040
1870 #define FF_DEBUG_SKIP 0x00000080
1871 #define FF_DEBUG_STARTCODE 0x00000100
1872 #define FF_DEBUG_PTS 0x00000200
1873 #define FF_DEBUG_ER 0x00000400
1874 #define FF_DEBUG_MMCO 0x00000800
1875 #define FF_DEBUG_BUGS 0x00001000
1876 #define FF_DEBUG_VIS_QP 0x00002000
1877 #define FF_DEBUG_VIS_MB_TYPE 0x00004000
1878 #define FF_DEBUG_BUFFERS 0x00008000
1879 #define FF_DEBUG_THREADS 0x00010000
1883 * - encoding: Set by user.
1884 * - decoding: Set by user.
1887 #define FF_DEBUG_VIS_MV_P_FOR 0x00000001 //visualize forward predicted MVs of P frames
1888 #define FF_DEBUG_VIS_MV_B_FOR 0x00000002 //visualize forward predicted MVs of B frames
1889 #define FF_DEBUG_VIS_MV_B_BACK 0x00000004 //visualize backward predicted MVs of B frames
1893 * - encoding: Set by libavcodec if flags&CODEC_FLAG_PSNR.
1894 * - decoding: unused
1899 * motion estimation comparison function
1900 * - encoding: Set by user.
1901 * - decoding: unused
1905 * subpixel motion estimation comparison function
1906 * - encoding: Set by user.
1907 * - decoding: unused
1911 * macroblock comparison function (not supported yet)
1912 * - encoding: Set by user.
1913 * - decoding: unused
1917 * interlaced DCT comparison function
1918 * - encoding: Set by user.
1919 * - decoding: unused
1922 #define FF_CMP_SAD 0
1923 #define FF_CMP_SSE 1
1924 #define FF_CMP_SATD 2
1925 #define FF_CMP_DCT 3
1926 #define FF_CMP_PSNR 4
1927 #define FF_CMP_BIT 5
1929 #define FF_CMP_ZERO 7
1930 #define FF_CMP_VSAD 8
1931 #define FF_CMP_VSSE 9
1932 #define FF_CMP_NSSE 10
1933 #define FF_CMP_W53 11
1934 #define FF_CMP_W97 12
1935 #define FF_CMP_DCTMAX 13
1936 #define FF_CMP_DCT264 14
1937 #define FF_CMP_CHROMA 256
1940 * ME diamond size & shape
1941 * - encoding: Set by user.
1942 * - decoding: unused
1947 * amount of previous MV predictors (2a+1 x 2a+1 square)
1948 * - encoding: Set by user.
1949 * - decoding: unused
1951 int last_predictor_count;
1954 * prepass for motion estimation
1955 * - encoding: Set by user.
1956 * - decoding: unused
1961 * motion estimation prepass comparison function
1962 * - encoding: Set by user.
1963 * - decoding: unused
1968 * ME prepass diamond size & shape
1969 * - encoding: Set by user.
1970 * - decoding: unused
1976 * - encoding: Set by user.
1977 * - decoding: unused
1979 int me_subpel_quality;
1982 * callback to negotiate the pixelFormat
1983 * @param fmt is the list of formats which are supported by the codec,
1984 * it is terminated by -1 as 0 is a valid format, the formats are ordered by quality.
1985 * The first is always the native one.
1986 * @return the chosen format
1987 * - encoding: unused
1988 * - decoding: Set by user, if not set the native format will be chosen.
1990 enum PixelFormat (*get_format)(struct AVCodecContext *s, const enum PixelFormat * fmt);
1993 * DTG active format information (additional aspect ratio
1994 * information only used in DVB MPEG-2 transport streams)
1997 * - encoding: unused
1998 * - decoding: Set by decoder.
2000 int dtg_active_format;
2001 #define FF_DTG_AFD_SAME 8
2002 #define FF_DTG_AFD_4_3 9
2003 #define FF_DTG_AFD_16_9 10
2004 #define FF_DTG_AFD_14_9 11
2005 #define FF_DTG_AFD_4_3_SP_14_9 13
2006 #define FF_DTG_AFD_16_9_SP_14_9 14
2007 #define FF_DTG_AFD_SP_4_3 15
2010 * maximum motion estimation search range in subpel units
2011 * If 0 then no limit.
2013 * - encoding: Set by user.
2014 * - decoding: unused
2019 * intra quantizer bias
2020 * - encoding: Set by user.
2021 * - decoding: unused
2023 int intra_quant_bias;
2024 #define FF_DEFAULT_QUANT_BIAS 999999
2027 * inter quantizer bias
2028 * - encoding: Set by user.
2029 * - decoding: unused
2031 int inter_quant_bias;
2035 * - encoding: unused
2036 * - decoding: Which clrtable should be used for 8bit RGB images.
2037 * Tables have to be stored somewhere. FIXME
2042 * internal_buffer count
2043 * Don't touch, used by libavcodec default_get_buffer().
2045 int internal_buffer_count;
2049 * Don't touch, used by libavcodec default_get_buffer().
2051 void *internal_buffer;
2054 * Global quality for codecs which cannot change it per frame.
2055 * This should be proportional to MPEG-1/2/4 qscale.
2056 * - encoding: Set by user.
2057 * - decoding: unused
2061 #define FF_CODER_TYPE_VLC 0
2062 #define FF_CODER_TYPE_AC 1
2063 #define FF_CODER_TYPE_RAW 2
2064 #define FF_CODER_TYPE_RLE 3
2065 #define FF_CODER_TYPE_DEFLATE 4
2068 * - encoding: Set by user.
2069 * - decoding: unused
2075 * - encoding: Set by user.
2076 * - decoding: unused
2082 * - encoding: unused
2083 * - decoding: Set by user.
2085 uint8_t * (*realloc)(struct AVCodecContext *s, uint8_t *buf, int buf_size);
2090 * - encoding: unused
2091 * - decoding: Set by user.
2094 #define SLICE_FLAG_CODED_ORDER 0x0001 ///< draw_horiz_band() is called in coded order instead of display
2095 #define SLICE_FLAG_ALLOW_FIELD 0x0002 ///< allow draw_horiz_band() with field slices (MPEG2 field pics)
2096 #define SLICE_FLAG_ALLOW_PLANE 0x0004 ///< allow draw_horiz_band() with 1 component at a time (SVQ1)
2099 * XVideo Motion Acceleration
2100 * - encoding: forbidden
2101 * - decoding: set by decoder
2103 int xvmc_acceleration;
2106 * macroblock decision mode
2107 * - encoding: Set by user.
2108 * - decoding: unused
2111 #define FF_MB_DECISION_SIMPLE 0 ///< uses mb_cmp
2112 #define FF_MB_DECISION_BITS 1 ///< chooses the one which needs the fewest bits
2113 #define FF_MB_DECISION_RD 2 ///< rate distortion
2116 * custom intra quantization matrix
2117 * - encoding: Set by user, can be NULL.
2118 * - decoding: Set by libavcodec.
2120 uint16_t *intra_matrix;
2123 * custom inter quantization matrix
2124 * - encoding: Set by user, can be NULL.
2125 * - decoding: Set by libavcodec.
2127 uint16_t *inter_matrix;
2130 * fourcc from the AVI stream header (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A').
2131 * This is used to work around some encoder bugs.
2132 * - encoding: unused
2133 * - decoding: Set by user, will be converted to uppercase by libavcodec during init.
2135 unsigned int stream_codec_tag;
2138 * scene change detection threshold
2139 * 0 is default, larger means fewer detected scene changes.
2140 * - encoding: Set by user.
2141 * - decoding: unused
2143 int scenechange_threshold;
2146 * minimum Lagrange multipler
2147 * - encoding: Set by user.
2148 * - decoding: unused
2153 * maximum Lagrange multipler
2154 * - encoding: Set by user.
2155 * - decoding: unused
2159 #if FF_API_PALETTE_CONTROL
2161 * palette control structure
2162 * - encoding: ??? (no palette-enabled encoder yet)
2163 * - decoding: Set by user.
2165 struct AVPaletteControl *palctrl;
2169 * noise reduction strength
2170 * - encoding: Set by user.
2171 * - decoding: unused
2173 int noise_reduction;
2176 * Called at the beginning of a frame to get cr buffer for it.
2177 * Buffer type (size, hints) must be the same. libavcodec won't check it.
2178 * libavcodec will pass previous buffer in pic, function should return
2179 * same buffer or new buffer with old frame "painted" into it.
2180 * If pic.data[0] == NULL must behave like get_buffer().
2181 * if CODEC_CAP_DR1 is not set then reget_buffer() must call
2182 * avcodec_default_reget_buffer() instead of providing buffers allocated by
2184 * - encoding: unused
2185 * - decoding: Set by libavcodec, user can override.
2187 int (*reget_buffer)(struct AVCodecContext *c, AVFrame *pic);
2190 * Number of bits which should be loaded into the rc buffer before decoding starts.
2191 * - encoding: Set by user.
2192 * - decoding: unused
2194 int rc_initial_buffer_occupancy;
2198 * - encoding: Set by user.
2199 * - decoding: unused
2201 int inter_threshold;
2205 * - encoding: Set by user.
2206 * - decoding: Set by user.
2211 * Simulates errors in the bitstream to test error concealment.
2212 * - encoding: Set by user.
2213 * - decoding: unused
2217 #if FF_API_ANTIALIAS_ALGO
2219 * MP3 antialias algorithm, see FF_AA_* below.
2220 * - encoding: unused
2221 * - decoding: Set by user.
2223 attribute_deprecated int antialias_algo;
2224 #define FF_AA_AUTO 0
2225 #define FF_AA_FASTINT 1 //not implemented yet
2227 #define FF_AA_FLOAT 3
2231 * quantizer noise shaping
2232 * - encoding: Set by user.
2233 * - decoding: unused
2235 int quantizer_noise_shaping;
2239 * is used to decide how many independent tasks should be passed to execute()
2240 * - encoding: Set by user.
2241 * - decoding: Set by user.
2246 * The codec may call this to execute several independent things.
2247 * It will return only after finishing all tasks.
2248 * The user may replace this with some multithreaded implementation,
2249 * the default implementation will execute the parts serially.
2250 * @param count the number of things to execute
2251 * - encoding: Set by libavcodec, user can override.
2252 * - decoding: Set by libavcodec, user can override.
2254 int (*execute)(struct AVCodecContext *c, int (*func)(struct AVCodecContext *c2, void *arg), void *arg2, int *ret, int count, int size);
2258 * Can be used by execute() to store some per AVCodecContext stuff.
2259 * - encoding: set by execute()
2260 * - decoding: set by execute()
2262 void *thread_opaque;
2265 * Motion estimation threshold below which no motion estimation is
2266 * performed, but instead the user specified motion vectors are used.
2268 * - encoding: Set by user.
2269 * - decoding: unused
2274 * Macroblock threshold below which the user specified macroblock types will be used.
2275 * - encoding: Set by user.
2276 * - decoding: unused
2281 * precision of the intra DC coefficient - 8
2282 * - encoding: Set by user.
2283 * - decoding: unused
2285 int intra_dc_precision;
2288 * noise vs. sse weight for the nsse comparsion function
2289 * - encoding: Set by user.
2290 * - decoding: unused
2295 * Number of macroblock rows at the top which are skipped.
2296 * - encoding: unused
2297 * - decoding: Set by user.
2302 * Number of macroblock rows at the bottom which are skipped.
2303 * - encoding: unused
2304 * - decoding: Set by user.
2310 * - encoding: Set by user.
2311 * - decoding: Set by libavcodec.
2314 #define FF_PROFILE_UNKNOWN -99
2315 #define FF_PROFILE_RESERVED -100
2317 #define FF_PROFILE_AAC_MAIN 0
2318 #define FF_PROFILE_AAC_LOW 1
2319 #define FF_PROFILE_AAC_SSR 2
2320 #define FF_PROFILE_AAC_LTP 3
2322 #define FF_PROFILE_DTS 20
2323 #define FF_PROFILE_DTS_ES 30
2324 #define FF_PROFILE_DTS_96_24 40
2325 #define FF_PROFILE_DTS_HD_HRA 50
2326 #define FF_PROFILE_DTS_HD_MA 60
2328 #define FF_PROFILE_MPEG2_422 0
2329 #define FF_PROFILE_MPEG2_HIGH 1
2330 #define FF_PROFILE_MPEG2_SS 2
2331 #define FF_PROFILE_MPEG2_SNR_SCALABLE 3
2332 #define FF_PROFILE_MPEG2_MAIN 4
2333 #define FF_PROFILE_MPEG2_SIMPLE 5
2335 #define FF_PROFILE_H264_CONSTRAINED (1<<9) // 8+1; constraint_set1_flag
2336 #define FF_PROFILE_H264_INTRA (1<<11) // 8+3; constraint_set3_flag
2338 #define FF_PROFILE_H264_BASELINE 66
2339 #define FF_PROFILE_H264_CONSTRAINED_BASELINE (66|FF_PROFILE_H264_CONSTRAINED)
2340 #define FF_PROFILE_H264_MAIN 77
2341 #define FF_PROFILE_H264_EXTENDED 88
2342 #define FF_PROFILE_H264_HIGH 100
2343 #define FF_PROFILE_H264_HIGH_10 110
2344 #define FF_PROFILE_H264_HIGH_10_INTRA (110|FF_PROFILE_H264_INTRA)
2345 #define FF_PROFILE_H264_HIGH_422 122
2346 #define FF_PROFILE_H264_HIGH_422_INTRA (122|FF_PROFILE_H264_INTRA)
2347 #define FF_PROFILE_H264_HIGH_444 144
2348 #define FF_PROFILE_H264_HIGH_444_PREDICTIVE 244
2349 #define FF_PROFILE_H264_HIGH_444_INTRA (244|FF_PROFILE_H264_INTRA)
2350 #define FF_PROFILE_H264_CAVLC_444 44
2352 #define FF_PROFILE_VC1_SIMPLE 0
2353 #define FF_PROFILE_VC1_MAIN 1
2354 #define FF_PROFILE_VC1_COMPLEX 2
2355 #define FF_PROFILE_VC1_ADVANCED 3
2357 #define FF_PROFILE_MPEG4_SIMPLE 0
2358 #define FF_PROFILE_MPEG4_SIMPLE_SCALABLE 1
2359 #define FF_PROFILE_MPEG4_CORE 2
2360 #define FF_PROFILE_MPEG4_MAIN 3
2361 #define FF_PROFILE_MPEG4_N_BIT 4
2362 #define FF_PROFILE_MPEG4_SCALABLE_TEXTURE 5
2363 #define FF_PROFILE_MPEG4_SIMPLE_FACE_ANIMATION 6
2364 #define FF_PROFILE_MPEG4_BASIC_ANIMATED_TEXTURE 7
2365 #define FF_PROFILE_MPEG4_HYBRID 8
2366 #define FF_PROFILE_MPEG4_ADVANCED_REAL_TIME 9
2367 #define FF_PROFILE_MPEG4_CORE_SCALABLE 10
2368 #define FF_PROFILE_MPEG4_ADVANCED_CODING 11
2369 #define FF_PROFILE_MPEG4_ADVANCED_CORE 12
2370 #define FF_PROFILE_MPEG4_ADVANCED_SCALABLE_TEXTURE 13
2371 #define FF_PROFILE_MPEG4_SIMPLE_STUDIO 14
2372 #define FF_PROFILE_MPEG4_ADVANCED_SIMPLE 15
2376 * - encoding: Set by user.
2377 * - decoding: Set by libavcodec.
2380 #define FF_LEVEL_UNKNOWN -99
2383 * low resolution decoding, 1-> 1/2 size, 2->1/4 size
2384 * - encoding: unused
2385 * - decoding: Set by user.
2390 * Bitstream width / height, may be different from width/height if lowres enabled.
2391 * - encoding: unused
2392 * - decoding: Set by user before init if known. Codec should override / dynamically change if needed.
2394 int coded_width, coded_height;
2397 * frame skip threshold
2398 * - encoding: Set by user.
2399 * - decoding: unused
2401 int frame_skip_threshold;
2405 * - encoding: Set by user.
2406 * - decoding: unused
2408 int frame_skip_factor;
2411 * frame skip exponent
2412 * - encoding: Set by user.
2413 * - decoding: unused
2418 * frame skip comparison function
2419 * - encoding: Set by user.
2420 * - decoding: unused
2425 * Border processing masking, raises the quantizer for mbs on the borders
2427 * - encoding: Set by user.
2428 * - decoding: unused
2430 float border_masking;
2433 * minimum MB lagrange multipler
2434 * - encoding: Set by user.
2435 * - decoding: unused
2440 * maximum MB lagrange multipler
2441 * - encoding: Set by user.
2442 * - decoding: unused
2448 * - encoding: Set by user.
2449 * - decoding: unused
2451 int me_penalty_compensation;
2455 * - encoding: unused
2456 * - decoding: Set by user.
2458 enum AVDiscard skip_loop_filter;
2462 * - encoding: unused
2463 * - decoding: Set by user.
2465 enum AVDiscard skip_idct;
2469 * - encoding: unused
2470 * - decoding: Set by user.
2472 enum AVDiscard skip_frame;
2476 * - encoding: Set by user.
2477 * - decoding: unused
2483 * - encoding: Set by user.
2484 * - decoding: unused
2488 #if FF_API_X264_GLOBAL_OPTS
2490 * constant rate factor - quality-based VBR - values ~correspond to qps
2491 * - encoding: Set by user.
2492 * - decoding: unused
2493 * @deprecated use 'crf' libx264 private option
2495 attribute_deprecated float crf;
2498 * constant quantization parameter rate control method
2499 * - encoding: Set by user.
2500 * - decoding: unused
2501 * @deprecated use 'cqp' libx264 private option
2503 attribute_deprecated int cqp;
2508 * - encoding: Set by user.
2509 * - decoding: unused
2514 * number of reference frames
2515 * - encoding: Set by user.
2516 * - decoding: Set by lavc.
2521 * chroma qp offset from luma
2522 * - encoding: Set by user.
2523 * - decoding: unused
2527 #if FF_API_X264_GLOBAL_OPTS
2529 * Influences how often B-frames are used.
2530 * - encoding: Set by user.
2531 * - decoding: unused
2533 attribute_deprecated int bframebias;
2537 * trellis RD quantization
2538 * - encoding: Set by user.
2539 * - decoding: unused
2543 #if FF_API_X264_GLOBAL_OPTS
2545 * Reduce fluctuations in qp (before curve compression).
2546 * - encoding: Set by user.
2547 * - decoding: unused
2549 attribute_deprecated float complexityblur;
2552 * in-loop deblocking filter alphac0 parameter
2553 * alpha is in the range -6...6
2554 * - encoding: Set by user.
2555 * - decoding: unused
2557 attribute_deprecated int deblockalpha;
2560 * in-loop deblocking filter beta parameter
2561 * beta is in the range -6...6
2562 * - encoding: Set by user.
2563 * - decoding: unused
2565 attribute_deprecated int deblockbeta;
2568 * macroblock subpartition sizes to consider - p8x8, p4x4, b8x8, i8x8, i4x4
2569 * - encoding: Set by user.
2570 * - decoding: unused
2572 attribute_deprecated int partitions;
2573 #define X264_PART_I4X4 0x001 /* Analyze i4x4 */
2574 #define X264_PART_I8X8 0x002 /* Analyze i8x8 (requires 8x8 transform) */
2575 #define X264_PART_P8X8 0x010 /* Analyze p16x8, p8x16 and p8x8 */
2576 #define X264_PART_P4X4 0x020 /* Analyze p8x4, p4x8, p4x4 */
2577 #define X264_PART_B8X8 0x100 /* Analyze b16x8, b8x16 and b8x8 */
2580 * direct MV prediction mode - 0 (none), 1 (spatial), 2 (temporal), 3 (auto)
2581 * - encoding: Set by user.
2582 * - decoding: unused
2584 attribute_deprecated int directpred;
2588 * Audio cutoff bandwidth (0 means "automatic")
2589 * - encoding: Set by user.
2590 * - decoding: unused
2595 * Multiplied by qscale for each frame and added to scene_change_score.
2596 * - encoding: Set by user.
2597 * - decoding: unused
2599 int scenechange_factor;
2603 * Note: Value depends upon the compare function used for fullpel ME.
2604 * - encoding: Set by user.
2605 * - decoding: unused
2610 * Adjusts sensitivity of b_frame_strategy 1.
2611 * - encoding: Set by user.
2612 * - decoding: unused
2617 * - encoding: Set by user.
2618 * - decoding: unused
2620 int compression_level;
2621 #define FF_COMPRESSION_DEFAULT -1
2624 * - encoding: Set by user.
2625 * - decoding: unused
2627 int min_prediction_order;
2630 * - encoding: Set by user.
2631 * - decoding: unused
2633 int max_prediction_order;
2635 #if FF_API_FLAC_GLOBAL_OPTS
2637 * @name FLAC options
2638 * @deprecated Use FLAC encoder private options instead.
2643 * LPC coefficient precision - used by FLAC encoder
2644 * - encoding: Set by user.
2645 * - decoding: unused
2647 attribute_deprecated int lpc_coeff_precision;
2650 * search method for selecting prediction order
2651 * - encoding: Set by user.
2652 * - decoding: unused
2654 attribute_deprecated int prediction_order_method;
2657 * - encoding: Set by user.
2658 * - decoding: unused
2660 attribute_deprecated int min_partition_order;
2663 * - encoding: Set by user.
2664 * - decoding: unused
2666 attribute_deprecated int max_partition_order;
2673 * GOP timecode frame start number, in non drop frame format
2674 * - encoding: Set by user.
2675 * - decoding: unused
2677 int64_t timecode_frame_start;
2679 #if FF_API_REQUEST_CHANNELS
2681 * Decoder should decode to this many channels if it can (0 for default)
2682 * - encoding: unused
2683 * - decoding: Set by user.
2684 * @deprecated Deprecated in favor of request_channel_layout.
2686 int request_channels;
2689 #if FF_API_DRC_SCALE
2691 * Percentage of dynamic range compression to be applied by the decoder.
2692 * The default value is 1.0, corresponding to full compression.
2693 * - encoding: unused
2694 * - decoding: Set by user.
2695 * @deprecated use AC3 decoder private option instead.
2697 attribute_deprecated float drc_scale;
2701 * opaque 64bit number (generally a PTS) that will be reordered and
2702 * output in AVFrame.reordered_opaque
2703 * @deprecated in favor of pkt_pts
2704 * - encoding: unused
2705 * - decoding: Set by user.
2707 int64_t reordered_opaque;
2710 * Bits per sample/pixel of internal libavcodec pixel/sample format.
2711 * - encoding: set by user.
2712 * - decoding: set by libavcodec.
2714 int bits_per_raw_sample;
2717 * Audio channel layout.
2718 * - encoding: set by user.
2719 * - decoding: set by user, may be overwritten by libavcodec.
2721 int64_t channel_layout;
2724 * Request decoder to use this channel layout if it can (0 for default)
2725 * - encoding: unused
2726 * - decoding: Set by user.
2728 int64_t request_channel_layout;
2731 * Ratecontrol attempt to use, at maximum, <value> of what can be used without an underflow.
2732 * - encoding: Set by user.
2733 * - decoding: unused.
2735 float rc_max_available_vbv_use;
2738 * Ratecontrol attempt to use, at least, <value> times the amount needed to prevent a vbv overflow.
2739 * - encoding: Set by user.
2740 * - decoding: unused.
2742 float rc_min_vbv_overflow_use;
2745 * Hardware accelerator in use
2746 * - encoding: unused.
2747 * - decoding: Set by libavcodec
2749 struct AVHWAccel *hwaccel;
2752 * For some codecs, the time base is closer to the field rate than the frame rate.
2753 * Most notably, H.264 and MPEG-2 specify time_base as half of frame duration
2754 * if no telecine is used ...
2756 * Set to time_base ticks per frame. Default 1, e.g., H.264/MPEG-2 set it to 2.
2758 int ticks_per_frame;
2761 * Hardware accelerator context.
2762 * For some hardware accelerators, a global context needs to be
2763 * provided by the user. In that case, this holds display-dependent
2764 * data FFmpeg cannot instantiate itself. Please refer to the
2765 * FFmpeg HW accelerator documentation to know how to fill this
2766 * is. e.g. for VA API, this is a struct vaapi_context.
2767 * - encoding: unused
2768 * - decoding: Set by user
2770 void *hwaccel_context;
2773 * Chromaticity coordinates of the source primaries.
2774 * - encoding: Set by user
2775 * - decoding: Set by libavcodec
2777 enum AVColorPrimaries color_primaries;
2780 * Color Transfer Characteristic.
2781 * - encoding: Set by user
2782 * - decoding: Set by libavcodec
2784 enum AVColorTransferCharacteristic color_trc;
2787 * YUV colorspace type.
2788 * - encoding: Set by user
2789 * - decoding: Set by libavcodec
2791 enum AVColorSpace colorspace;
2794 * MPEG vs JPEG YUV range.
2795 * - encoding: Set by user
2796 * - decoding: Set by libavcodec
2798 enum AVColorRange color_range;
2801 * This defines the location of chroma samples.
2802 * - encoding: Set by user
2803 * - decoding: Set by libavcodec
2805 enum AVChromaLocation chroma_sample_location;
2808 * The codec may call this to execute several independent things.
2809 * It will return only after finishing all tasks.
2810 * The user may replace this with some multithreaded implementation,
2811 * the default implementation will execute the parts serially.
2812 * Also see avcodec_thread_init and e.g. the --enable-pthread configure option.
2813 * @param c context passed also to func
2814 * @param count the number of things to execute
2815 * @param arg2 argument passed unchanged to func
2816 * @param ret return values of executed functions, must have space for "count" values. May be NULL.
2817 * @param func function that will be called count times, with jobnr from 0 to count-1.
2818 * threadnr will be in the range 0 to c->thread_count-1 < MAX_THREADS and so that no
2819 * two instances of func executing at the same time will have the same threadnr.
2820 * @return always 0 currently, but code should handle a future improvement where when any call to func
2821 * returns < 0 no further calls to func may be done and < 0 is returned.
2822 * - encoding: Set by libavcodec, user can override.
2823 * - decoding: Set by libavcodec, user can override.
2825 int (*execute2)(struct AVCodecContext *c, int (*func)(struct AVCodecContext *c2, void *arg, int jobnr, int threadnr), void *arg2, int *ret, int count);
2827 #if FF_API_X264_GLOBAL_OPTS
2829 * explicit P-frame weighted prediction analysis method
2831 * 1: fast blind weighting (one reference duplicate with -1 offset)
2832 * 2: smart weighting (full fade detection analysis)
2833 * - encoding: Set by user.
2834 * - decoding: unused
2836 attribute_deprecated int weighted_p_pred;
2841 * 1: Variance AQ (complexity mask)
2842 * 2: Auto-variance AQ (experimental)
2843 * - encoding: Set by user
2844 * - decoding: unused
2846 attribute_deprecated int aq_mode;
2850 * Reduces blocking and blurring in flat and textured areas.
2851 * - encoding: Set by user
2852 * - decoding: unused
2854 attribute_deprecated float aq_strength;
2858 * Strength of psychovisual optimization
2859 * - encoding: Set by user
2860 * - decoding: unused
2862 attribute_deprecated float psy_rd;
2866 * Strength of psychovisual optimization
2867 * - encoding: Set by user
2868 * - decoding: unused
2870 attribute_deprecated float psy_trellis;
2874 * Number of frames for frametype and ratecontrol lookahead
2875 * - encoding: Set by user
2876 * - decoding: unused
2878 attribute_deprecated int rc_lookahead;
2881 * Constant rate factor maximum
2882 * With CRF encoding mode and VBV restrictions enabled, prevents quality from being worse
2883 * than crf_max, even if doing so would violate VBV restrictions.
2884 * - encoding: Set by user.
2885 * - decoding: unused
2887 attribute_deprecated float crf_max;
2890 int log_level_offset;
2892 #if FF_API_FLAC_GLOBAL_OPTS
2894 * Determines which LPC analysis algorithm to use.
2895 * - encoding: Set by user
2896 * - decoding: unused
2898 attribute_deprecated enum AVLPCType lpc_type;
2901 * Number of passes to use for Cholesky factorization during LPC analysis
2902 * - encoding: Set by user
2903 * - decoding: unused
2905 attribute_deprecated int lpc_passes;
2910 * Indicates number of picture subdivisions. Used for parallelized
2912 * - encoding: Set by user
2913 * - decoding: unused
2918 * Header containing style information for text subtitles.
2919 * For SUBTITLE_ASS subtitle type, it should contain the whole ASS
2920 * [Script Info] and [V4+ Styles] section, plus the [Events] line and
2921 * the Format line following. It shouldn't include any Dialogue line.
2922 * - encoding: Set/allocated/freed by user (before avcodec_open())
2923 * - decoding: Set/allocated/freed by libavcodec (by avcodec_open())
2925 uint8_t *subtitle_header;
2926 int subtitle_header_size;
2929 * Current packet as passed into the decoder, to avoid having
2930 * to pass the packet into every function. Currently only valid
2931 * inside lavc and get/release_buffer callbacks.
2932 * - decoding: set by avcodec_decode_*, read by get_buffer() for setting pkt_pts
2933 * - encoding: unused
2938 * Whether this is a copy of the context which had init() called on it.
2939 * This is used by multithreading - shared tables and picture pointers
2940 * should be freed from the original context only.
2941 * - encoding: Set by libavcodec.
2942 * - decoding: Set by libavcodec.
2947 * Which multithreading methods to use.
2948 * Use of FF_THREAD_FRAME will increase decoding delay by one frame per thread,
2949 * so clients which cannot provide future frames should not use it.
2951 * - encoding: Set by user, otherwise the default is used.
2952 * - decoding: Set by user, otherwise the default is used.
2955 #define FF_THREAD_FRAME 1 ///< Decode more than one frame at once
2956 #define FF_THREAD_SLICE 2 ///< Decode more than one part of a single frame at once
2959 * Which multithreading methods are in use by the codec.
2960 * - encoding: Set by libavcodec.
2961 * - decoding: Set by libavcodec.
2963 int active_thread_type;
2966 * Set by the client if its custom get_buffer() callback can be called
2967 * from another thread, which allows faster multithreaded decoding.
2968 * draw_horiz_band() will be called from other threads regardless of this setting.
2969 * Ignored if the default get_buffer() is used.
2970 * - encoding: Set by user.
2971 * - decoding: Set by user.
2973 int thread_safe_callbacks;
2976 * VBV delay coded in the last frame (in periods of a 27 MHz clock).
2977 * Used for compliant TS muxing.
2978 * - encoding: Set by libavcodec.
2979 * - decoding: unused.
2984 * Type of service that the audio stream conveys.
2985 * - encoding: Set by user.
2986 * - decoding: Set by libavcodec.
2988 enum AVAudioServiceType audio_service_type;
2991 * desired sample format
2992 * - encoding: Not used.
2993 * - decoding: Set by user.
2994 * Decoder will decode to this format if it can.
2996 enum AVSampleFormat request_sample_fmt;
2999 * Error recognition; may misdetect some more or less valid parts as errors.
3000 * - encoding: unused
3001 * - decoding: Set by user.
3003 int err_recognition;
3004 #define AV_EF_CRCCHECK (1<<0)
3005 #define AV_EF_BITSTREAM (1<<1)
3006 #define AV_EF_BUFFER (1<<2)
3007 #define AV_EF_EXPLODE (1<<3)
3010 * Current statistics for PTS correction.
3011 * - decoding: maintained and used by libavcodec, not intended to be used by user apps
3012 * - encoding: unused
3014 int64_t pts_correction_num_faulty_pts; /// Number of incorrect PTS values so far
3015 int64_t pts_correction_num_faulty_dts; /// Number of incorrect DTS values so far
3016 int64_t pts_correction_last_pts; /// PTS of the last frame
3017 int64_t pts_correction_last_dts; /// DTS of the last frame
3024 typedef struct AVProfile {
3026 const char *name; ///< short name for the profile
3029 typedef struct AVCodecDefault AVCodecDefault;
3034 typedef struct AVCodec {
3036 * Name of the codec implementation.
3037 * The name is globally unique among encoders and among decoders (but an
3038 * encoder and a decoder can share the same name).
3039 * This is the primary way to find a codec from the user perspective.
3042 enum AVMediaType type;
3045 int (*init)(AVCodecContext *);
3046 int (*encode)(AVCodecContext *, uint8_t *buf, int buf_size, void *data);
3047 int (*close)(AVCodecContext *);
3048 int (*decode)(AVCodecContext *, void *outdata, int *outdata_size, AVPacket *avpkt);
3050 * Codec capabilities.
3054 struct AVCodec *next;
3057 * Will be called when seeking
3059 void (*flush)(AVCodecContext *);
3060 const AVRational *supported_framerates; ///< array of supported framerates, or NULL if any, array is terminated by {0,0}
3061 const enum PixelFormat *pix_fmts; ///< array of supported pixel formats, or NULL if unknown, array is terminated by -1
3063 * Descriptive name for the codec, meant to be more human readable than name.
3064 * You should use the NULL_IF_CONFIG_SMALL() macro to define it.
3066 const char *long_name;
3067 const int *supported_samplerates; ///< array of supported audio samplerates, or NULL if unknown, array is terminated by 0
3068 const enum AVSampleFormat *sample_fmts; ///< array of supported sample formats, or NULL if unknown, array is terminated by -1
3069 const int64_t *channel_layouts; ///< array of support channel layouts, or NULL if unknown. array is terminated by 0
3070 uint8_t max_lowres; ///< maximum value for lowres supported by the decoder
3071 const AVClass *priv_class; ///< AVClass for the private context
3072 const AVProfile *profiles; ///< array of recognized profiles, or NULL if unknown, array is terminated by {FF_PROFILE_UNKNOWN}
3075 * @name Frame-level threading support functions
3079 * If defined, called on thread contexts when they are created.
3080 * If the codec allocates writable tables in init(), re-allocate them here.
3081 * priv_data will be set to a copy of the original.
3083 int (*init_thread_copy)(AVCodecContext *);
3085 * Copy necessary context variables from a previous thread context to the current one.
3086 * If not defined, the next thread will start automatically; otherwise, the codec
3087 * must call ff_thread_finish_setup().
3089 * dst and src will (rarely) point to the same context, in which case memcpy should be skipped.
3091 int (*update_thread_context)(AVCodecContext *dst, const AVCodecContext *src);
3095 * Private codec-specific defaults.
3097 const AVCodecDefault *defaults;
3100 * Initialize codec static data, called from avcodec_register().
3102 void (*init_static_data)(struct AVCodec *codec);
3108 typedef struct AVHWAccel {
3110 * Name of the hardware accelerated codec.
3111 * The name is globally unique among encoders and among decoders (but an
3112 * encoder and a decoder can share the same name).
3117 * Type of codec implemented by the hardware accelerator.
3119 * See AVMEDIA_TYPE_xxx
3121 enum AVMediaType type;
3124 * Codec implemented by the hardware accelerator.
3131 * Supported pixel format.
3133 * Only hardware accelerated formats are supported here.
3135 enum PixelFormat pix_fmt;
3138 * Hardware accelerated codec capabilities.
3139 * see FF_HWACCEL_CODEC_CAP_*
3143 struct AVHWAccel *next;
3146 * Called at the beginning of each frame or field picture.
3148 * Meaningful frame information (codec specific) is guaranteed to
3149 * be parsed at this point. This function is mandatory.
3151 * Note that buf can be NULL along with buf_size set to 0.
3152 * Otherwise, this means the whole frame is available at this point.
3154 * @param avctx the codec context
3155 * @param buf the frame data buffer base
3156 * @param buf_size the size of the frame in bytes
3157 * @return zero if successful, a negative value otherwise
3159 int (*start_frame)(AVCodecContext *avctx, const uint8_t *buf, uint32_t buf_size);
3162 * Callback for each slice.
3164 * Meaningful slice information (codec specific) is guaranteed to
3165 * be parsed at this point. This function is mandatory.
3167 * @param avctx the codec context
3168 * @param buf the slice data buffer base
3169 * @param buf_size the size of the slice in bytes
3170 * @return zero if successful, a negative value otherwise
3172 int (*decode_slice)(AVCodecContext *avctx, const uint8_t *buf, uint32_t buf_size);
3175 * Called at the end of each frame or field picture.
3177 * The whole picture is parsed at this point and can now be sent
3178 * to the hardware accelerator. This function is mandatory.
3180 * @param avctx the codec context
3181 * @return zero if successful, a negative value otherwise
3183 int (*end_frame)(AVCodecContext *avctx);
3186 * Size of HW accelerator private data.
3188 * Private data is allocated with av_mallocz() before
3189 * AVCodecContext.get_buffer() and deallocated after
3190 * AVCodecContext.release_buffer().
3196 * four components are given, that's all.
3197 * the last component is alpha
3199 typedef struct AVPicture {
3201 int linesize[4]; ///< number of bytes per line
3204 #define AVPALETTE_SIZE 1024
3205 #define AVPALETTE_COUNT 256
3206 #if FF_API_PALETTE_CONTROL
3209 * This structure defines a method for communicating palette changes
3210 * between and demuxer and a decoder.
3212 * @deprecated Use AVPacket to send palette changes instead.
3213 * This is totally broken.
3215 typedef struct AVPaletteControl {
3217 /* Demuxer sets this to 1 to indicate the palette has changed;
3218 * decoder resets to 0. */
3219 int palette_changed;
3221 /* 4-byte ARGB palette entries, stored in native byte order; note that
3222 * the individual palette components should be on a 8-bit scale; if
3223 * the palette data comes from an IBM VGA native format, the component
3224 * data is probably 6 bits in size and needs to be scaled. */
3225 unsigned int palette[AVPALETTE_COUNT];
3227 } AVPaletteControl attribute_deprecated;
3230 enum AVSubtitleType {
3233 SUBTITLE_BITMAP, ///< A bitmap, pict will be set
3236 * Plain text, the text field must be set by the decoder and is
3237 * authoritative. ass and pict fields may contain approximations.
3242 * Formatted text, the ass field must be set by the decoder and is
3243 * authoritative. pict and text fields may contain approximations.
3248 typedef struct AVSubtitleRect {
3249 int x; ///< top left corner of pict, undefined when pict is not set
3250 int y; ///< top left corner of pict, undefined when pict is not set
3251 int w; ///< width of pict, undefined when pict is not set
3252 int h; ///< height of pict, undefined when pict is not set
3253 int nb_colors; ///< number of colors in pict, undefined when pict is not set
3256 * data+linesize for the bitmap of this subtitle.
3257 * can be set for text/ass as well once they where rendered
3260 enum AVSubtitleType type;
3262 char *text; ///< 0 terminated plain UTF-8 text
3265 * 0 terminated ASS/SSA compatible event line.
3266 * The pressentation of this is unaffected by the other values in this
3272 typedef struct AVSubtitle {
3273 uint16_t format; /* 0 = graphics */
3274 uint32_t start_display_time; /* relative to packet pts, in ms */
3275 uint32_t end_display_time; /* relative to packet pts, in ms */
3277 AVSubtitleRect **rects;
3278 int64_t pts; ///< Same as packet pts, in AV_TIME_BASE
3281 /* packet functions */
3284 * @deprecated use NULL instead
3286 attribute_deprecated void av_destruct_packet_nofree(AVPacket *pkt);
3289 * Default packet destructor.
3291 void av_destruct_packet(AVPacket *pkt);
3294 * Initialize optional fields of a packet with default values.
3298 void av_init_packet(AVPacket *pkt);
3301 * Allocate the payload of a packet and initialize its fields with
3305 * @param size wanted payload size
3306 * @return 0 if OK, AVERROR_xxx otherwise
3308 int av_new_packet(AVPacket *pkt, int size);
3311 * Reduce packet size, correctly zeroing padding
3314 * @param size new size
3316 void av_shrink_packet(AVPacket *pkt, int size);
3319 * Increase packet size, correctly zeroing padding
3322 * @param grow_by number of bytes by which to increase the size of the packet
3324 int av_grow_packet(AVPacket *pkt, int grow_by);
3327 * @warning This is a hack - the packet memory allocation stuff is broken. The
3328 * packet is allocated if it was not really allocated.
3330 int av_dup_packet(AVPacket *pkt);
3335 * @param pkt packet to free
3337 void av_free_packet(AVPacket *pkt);
3340 * Allocate new information of a packet.
3343 * @param type side information type
3344 * @param size side information size
3345 * @return pointer to fresh allocated data or NULL otherwise
3347 uint8_t* av_packet_new_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
3351 * Get side information from packet.
3354 * @param type desired side information type
3355 * @param size pointer for side information size to store (optional)
3356 * @return pointer to data if present or NULL otherwise
3358 uint8_t* av_packet_get_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
3361 int av_packet_merge_side_data(AVPacket *pkt);
3363 int av_packet_split_side_data(AVPacket *pkt);
3368 struct ReSampleContext;
3369 struct AVResampleContext;
3371 typedef struct ReSampleContext ReSampleContext;
3374 * Initialize audio resampling context.
3376 * @param output_channels number of output channels
3377 * @param input_channels number of input channels
3378 * @param output_rate output sample rate
3379 * @param input_rate input sample rate
3380 * @param sample_fmt_out requested output sample format
3381 * @param sample_fmt_in input sample format
3382 * @param filter_length length of each FIR filter in the filterbank relative to the cutoff frequency
3383 * @param log2_phase_count log2 of the number of entries in the polyphase filterbank
3384 * @param linear if 1 then the used FIR filter will be linearly interpolated
3385 between the 2 closest, if 0 the closest will be used
3386 * @param cutoff cutoff frequency, 1.0 corresponds to half the output sampling rate
3387 * @return allocated ReSampleContext, NULL if error occured
3389 ReSampleContext *av_audio_resample_init(int output_channels, int input_channels,
3390 int output_rate, int input_rate,
3391 enum AVSampleFormat sample_fmt_out,
3392 enum AVSampleFormat sample_fmt_in,
3393 int filter_length, int log2_phase_count,
3394 int linear, double cutoff);
3396 int audio_resample(ReSampleContext *s, short *output, short *input, int nb_samples);
3399 * Free resample context.
3401 * @param s a non-NULL pointer to a resample context previously
3402 * created with av_audio_resample_init()
3404 void audio_resample_close(ReSampleContext *s);
3408 * Initialize an audio resampler.
3409 * Note, if either rate is not an integer then simply scale both rates up so they are.
3410 * @param filter_length length of each FIR filter in the filterbank relative to the cutoff freq
3411 * @param log2_phase_count log2 of the number of entries in the polyphase filterbank
3412 * @param linear If 1 then the used FIR filter will be linearly interpolated
3413 between the 2 closest, if 0 the closest will be used
3414 * @param cutoff cutoff frequency, 1.0 corresponds to half the output sampling rate
3416 struct AVResampleContext *av_resample_init(int out_rate, int in_rate, int filter_length, int log2_phase_count, int linear, double cutoff);
3419 * Resample an array of samples using a previously configured context.
3420 * @param src an array of unconsumed samples
3421 * @param consumed the number of samples of src which have been consumed are returned here
3422 * @param src_size the number of unconsumed samples available
3423 * @param dst_size the amount of space in samples available in dst
3424 * @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.
3425 * @return the number of samples written in dst or -1 if an error occurred
3427 int av_resample(struct AVResampleContext *c, short *dst, short *src, int *consumed, int src_size, int dst_size, int update_ctx);
3431 * Compensate samplerate/timestamp drift. The compensation is done by changing
3432 * the resampler parameters, so no audible clicks or similar distortions occur
3433 * @param compensation_distance distance in output samples over which the compensation should be performed
3434 * @param sample_delta number of output samples which should be output less
3436 * example: av_resample_compensate(c, 10, 500)
3437 * here instead of 510 samples only 500 samples would be output
3439 * note, due to rounding the actual compensation might be slightly different,
3440 * especially if the compensation_distance is large and the in_rate used during init is small
3442 void av_resample_compensate(struct AVResampleContext *c, int sample_delta, int compensation_distance);
3443 void av_resample_close(struct AVResampleContext *c);
3446 * Allocate memory for a picture. Call avpicture_free() to free it.
3448 * @see avpicture_fill()
3450 * @param picture the picture to be filled in
3451 * @param pix_fmt the format of the picture
3452 * @param width the width of the picture
3453 * @param height the height of the picture
3454 * @return zero if successful, a negative value if not
3456 int avpicture_alloc(AVPicture *picture, enum PixelFormat pix_fmt, int width, int height);
3459 * Free a picture previously allocated by avpicture_alloc().
3460 * The data buffer used by the AVPicture is freed, but the AVPicture structure
3463 * @param picture the AVPicture to be freed
3465 void avpicture_free(AVPicture *picture);
3468 * Fill in the AVPicture fields.
3469 * The fields of the given AVPicture are filled in by using the 'ptr' address
3470 * which points to the image data buffer. Depending on the specified picture
3471 * format, one or multiple image data pointers and line sizes will be set.
3472 * If a planar format is specified, several pointers will be set pointing to
3473 * the different picture planes and the line sizes of the different planes
3474 * will be stored in the lines_sizes array.
3475 * Call with ptr == NULL to get the required size for the ptr buffer.
3477 * To allocate the buffer and fill in the AVPicture fields in one call,
3478 * use avpicture_alloc().
3480 * @param picture AVPicture whose fields are to be filled in
3481 * @param ptr Buffer which will contain or contains the actual image data
3482 * @param pix_fmt The format in which the picture data is stored.
3483 * @param width the width of the image in pixels
3484 * @param height the height of the image in pixels
3485 * @return size of the image data in bytes
3487 int avpicture_fill(AVPicture *picture, uint8_t *ptr,
3488 enum PixelFormat pix_fmt, int width, int height);
3491 * Copy pixel data from an AVPicture into a buffer.
3492 * The data is stored compactly, without any gaps for alignment or padding
3493 * which may be applied by avpicture_fill().
3495 * @see avpicture_get_size()
3497 * @param[in] src AVPicture containing image data
3498 * @param[in] pix_fmt The format in which the picture data is stored.
3499 * @param[in] width the width of the image in pixels.
3500 * @param[in] height the height of the image in pixels.
3501 * @param[out] dest A buffer into which picture data will be copied.
3502 * @param[in] dest_size The size of 'dest'.
3503 * @return The number of bytes written to dest, or a negative value (error code) on error.
3505 int avpicture_layout(const AVPicture* src, enum PixelFormat pix_fmt, int width, int height,
3506 unsigned char *dest, int dest_size);
3509 * Calculate the size in bytes that a picture of the given width and height
3510 * would occupy if stored in the given picture format.
3511 * Note that this returns the size of a compact representation as generated
3512 * by avpicture_layout(), which can be smaller than the size required for e.g.
3515 * @param pix_fmt the given picture format
3516 * @param width the width of the image
3517 * @param height the height of the image
3518 * @return Image data size in bytes or -1 on error (e.g. too large dimensions).
3520 int avpicture_get_size(enum PixelFormat pix_fmt, int width, int height);
3521 void avcodec_get_chroma_sub_sample(enum PixelFormat pix_fmt, int *h_shift, int *v_shift);
3524 * Get the name of a codec.
3525 * @return a static string identifying the codec; never NULL
3527 const char *avcodec_get_name(enum CodecID id);
3529 #if FF_API_GET_PIX_FMT_NAME
3531 * Return the short name for a pixel format.
3533 * \see av_get_pix_fmt(), av_get_pix_fmt_string().
3534 * @deprecated Deprecated in favor of av_get_pix_fmt_name().
3536 attribute_deprecated
3537 const char *avcodec_get_pix_fmt_name(enum PixelFormat pix_fmt);
3540 void avcodec_set_dimensions(AVCodecContext *s, int width, int height);
3543 * Return a value representing the fourCC code associated to the
3544 * pixel format pix_fmt, or 0 if no associated fourCC code can be
3547 unsigned int avcodec_pix_fmt_to_codec_tag(enum PixelFormat pix_fmt);
3550 * Put a string representing the codec tag codec_tag in buf.
3552 * @param buf_size size in bytes of buf
3553 * @return the length of the string that would have been generated if
3554 * enough space had been available, excluding the trailing null
3556 size_t av_get_codec_tag_string(char *buf, size_t buf_size, unsigned int codec_tag);
3558 #define FF_LOSS_RESOLUTION 0x0001 /**< loss due to resolution change */
3559 #define FF_LOSS_DEPTH 0x0002 /**< loss due to color depth change */
3560 #define FF_LOSS_COLORSPACE 0x0004 /**< loss due to color space conversion */
3561 #define FF_LOSS_ALPHA 0x0008 /**< loss of alpha bits */
3562 #define FF_LOSS_COLORQUANT 0x0010 /**< loss due to color quantization */
3563 #define FF_LOSS_CHROMA 0x0020 /**< loss of chroma (e.g. RGB to gray conversion) */
3566 * Compute what kind of losses will occur when converting from one specific
3567 * pixel format to another.
3568 * When converting from one pixel format to another, information loss may occur.
3569 * For example, when converting from RGB24 to GRAY, the color information will
3570 * be lost. Similarly, other losses occur when converting from some formats to
3571 * other formats. These losses can involve loss of chroma, but also loss of
3572 * resolution, loss of color depth, loss due to the color space conversion, loss
3573 * of the alpha bits or loss due to color quantization.
3574 * avcodec_get_fix_fmt_loss() informs you about the various types of losses
3575 * which will occur when converting from one pixel format to another.
3577 * @param[in] dst_pix_fmt destination pixel format
3578 * @param[in] src_pix_fmt source pixel format
3579 * @param[in] has_alpha Whether the source pixel format alpha channel is used.
3580 * @return Combination of flags informing you what kind of losses will occur
3581 * (maximum loss for an invalid dst_pix_fmt).
3583 int avcodec_get_pix_fmt_loss(enum PixelFormat dst_pix_fmt, enum PixelFormat src_pix_fmt,
3587 * Find the best pixel format to convert to given a certain source pixel
3588 * format. When converting from one pixel format to another, information loss
3589 * may occur. For example, when converting from RGB24 to GRAY, the color
3590 * information will be lost. Similarly, other losses occur when converting from
3591 * some formats to other formats. avcodec_find_best_pix_fmt() searches which of
3592 * the given pixel formats should be used to suffer the least amount of loss.
3593 * The pixel formats from which it chooses one, are determined by the
3594 * pix_fmt_mask parameter.
3596 * Note, only the first 64 pixel formats will fit in pix_fmt_mask.
3599 * src_pix_fmt = PIX_FMT_YUV420P;
3600 * pix_fmt_mask = (1 << PIX_FMT_YUV422P) | (1 << PIX_FMT_RGB24);
3601 * dst_pix_fmt = avcodec_find_best_pix_fmt(pix_fmt_mask, src_pix_fmt, alpha, &loss);
3604 * @param[in] pix_fmt_mask bitmask determining which pixel format to choose from
3605 * @param[in] src_pix_fmt source pixel format
3606 * @param[in] has_alpha Whether the source pixel format alpha channel is used.
3607 * @param[out] loss_ptr Combination of flags informing you what kind of losses will occur.
3608 * @return The best pixel format to convert to or -1 if none was found.
3610 enum PixelFormat avcodec_find_best_pix_fmt(int64_t pix_fmt_mask, enum PixelFormat src_pix_fmt,
3611 int has_alpha, int *loss_ptr);
3614 * Find the best pixel format to convert to given a certain source pixel
3615 * format and a selection of two destination pixel formats. When converting from
3616 * one pixel format to another, information loss may occur. For example, when converting
3617 * from RGB24 to GRAY, the color information will be lost. Similarly, other losses occur when
3618 * converting from some formats to other formats. avcodec_find_best_pix_fmt2() selects which of
3619 * the given pixel formats should be used to suffer the least amount of loss.
3621 * If one of the destination formats is PIX_FMT_NONE the other pixel format (if valid) will be
3625 * src_pix_fmt = PIX_FMT_YUV420P;
3626 * dst_pix_fmt1= PIX_FMT_RGB24;
3627 * dst_pix_fmt2= PIX_FMT_GRAY8;
3628 * dst_pix_fmt3= PIX_FMT_RGB8;
3629 * loss= FF_LOSS_CHROMA; // don't care about chroma loss, so chroma loss will be ignored.
3630 * dst_pix_fmt = avcodec_find_best_pix_fmt2(dst_pix_fmt1, dst_pix_fmt2, src_pix_fmt, alpha, &loss);
3631 * dst_pix_fmt = avcodec_find_best_pix_fmt2(dst_pix_fmt, dst_pix_fmt3, src_pix_fmt, alpha, &loss);
3634 * @param[in] dst_pix_fmt1 One of the two destination pixel formats to choose from
3635 * @param[in] dst_pix_fmt2 The other of the two destination pixel formats to choose from
3636 * @param[in] src_pix_fmt Source pixel format
3637 * @param[in] has_alpha Whether the source pixel format alpha channel is used.
3638 * @param[in, out] loss_ptr Combination of loss flags. In: selects which of the losses to ignore, i.e.
3639 * NULL or value of zero means we care about all losses. Out: the loss
3640 * that occurs when converting from src to selected dst pixel format.
3641 * @return The best pixel format to convert to or -1 if none was found.
3643 enum PixelFormat avcodec_find_best_pix_fmt2(enum PixelFormat dst_pix_fmt1, enum PixelFormat dst_pix_fmt2,
3644 enum PixelFormat src_pix_fmt, int has_alpha, int *loss_ptr);
3646 #if FF_API_GET_ALPHA_INFO
3647 #define FF_ALPHA_TRANSP 0x0001 /* image has some totally transparent pixels */
3648 #define FF_ALPHA_SEMI_TRANSP 0x0002 /* image has some transparent pixels */
3651 * Tell if an image really has transparent alpha values.
3652 * @return ored mask of FF_ALPHA_xxx constants
3654 attribute_deprecated
3655 int img_get_alpha_info(const AVPicture *src,
3656 enum PixelFormat pix_fmt, int width, int height);
3659 /* deinterlace a picture */
3660 /* deinterlace - if not supported return -1 */
3661 int avpicture_deinterlace(AVPicture *dst, const AVPicture *src,
3662 enum PixelFormat pix_fmt, int width, int height);
3664 /* external high level API */
3667 * If c is NULL, returns the first registered codec,
3668 * if c is non-NULL, returns the next registered codec after c,
3669 * or NULL if c is the last one.
3671 AVCodec *av_codec_next(AVCodec *c);
3674 * Return the LIBAVCODEC_VERSION_INT constant.
3676 unsigned avcodec_version(void);
3679 * Return the libavcodec build-time configuration.
3681 const char *avcodec_configuration(void);
3684 * Return the libavcodec license.
3686 const char *avcodec_license(void);
3688 #if FF_API_AVCODEC_INIT
3690 * @deprecated this function is called automatically from avcodec_register()
3691 * and avcodec_register_all(), there is no need to call it manually
3693 attribute_deprecated
3694 void avcodec_init(void);
3698 * Register the codec codec and initialize libavcodec.
3700 * @warning either this function or avcodec_register_all() must be called
3701 * before any other libavcodec functions.
3703 * @see avcodec_register_all()
3705 void avcodec_register(AVCodec *codec);
3708 * Find a registered encoder with a matching codec ID.
3710 * @param id CodecID of the requested encoder
3711 * @return An encoder if one was found, NULL otherwise.
3713 AVCodec *avcodec_find_encoder(enum CodecID id);
3716 * Find a registered encoder with the specified name.
3718 * @param name name of the requested encoder
3719 * @return An encoder if one was found, NULL otherwise.
3721 AVCodec *avcodec_find_encoder_by_name(const char *name);
3724 * Find a registered decoder with a matching codec ID.
3726 * @param id CodecID of the requested decoder
3727 * @return A decoder if one was found, NULL otherwise.
3729 AVCodec *avcodec_find_decoder(enum CodecID id);
3732 * Find a registered decoder with the specified name.
3734 * @param name name of the requested decoder
3735 * @return A decoder if one was found, NULL otherwise.
3737 AVCodec *avcodec_find_decoder_by_name(const char *name);
3738 void avcodec_string(char *buf, int buf_size, AVCodecContext *enc, int encode);
3741 * Return a name for the specified profile, if available.
3743 * @param codec the codec that is searched for the given profile
3744 * @param profile the profile value for which a name is requested
3745 * @return A name for the profile if found, NULL otherwise.
3747 const char *av_get_profile_name(const AVCodec *codec, int profile);
3749 #if FF_API_ALLOC_CONTEXT
3751 * Set the fields of the given AVCodecContext to default values.
3753 * @param s The AVCodecContext of which the fields should be set to default values.
3754 * @deprecated use avcodec_get_context_defaults3
3756 attribute_deprecated
3757 void avcodec_get_context_defaults(AVCodecContext *s);
3759 /** THIS FUNCTION IS NOT YET PART OF THE PUBLIC API!
3760 * we WILL change its arguments and name a few times! */
3761 attribute_deprecated
3762 void avcodec_get_context_defaults2(AVCodecContext *s, enum AVMediaType);
3766 * Set the fields of the given AVCodecContext to default values corresponding
3767 * to the given codec (defaults may be codec-dependent).
3769 * Do not call this function if a non-NULL codec has been passed
3770 * to avcodec_alloc_context3() that allocated this AVCodecContext.
3771 * If codec is non-NULL, it is illegal to call avcodec_open2() with a
3772 * different codec on this AVCodecContext.
3774 int avcodec_get_context_defaults3(AVCodecContext *s, AVCodec *codec);
3776 #if FF_API_ALLOC_CONTEXT
3778 * Allocate an AVCodecContext and set its fields to default values. The
3779 * resulting struct can be deallocated by simply calling av_free().
3781 * @return An AVCodecContext filled with default values or NULL on failure.
3782 * @see avcodec_get_context_defaults
3784 * @deprecated use avcodec_alloc_context3()
3786 attribute_deprecated
3787 AVCodecContext *avcodec_alloc_context(void);
3789 /** THIS FUNCTION IS NOT YET PART OF THE PUBLIC API!
3790 * we WILL change its arguments and name a few times! */
3791 attribute_deprecated
3792 AVCodecContext *avcodec_alloc_context2(enum AVMediaType);
3796 * Allocate an AVCodecContext and set its fields to default values. The
3797 * resulting struct can be deallocated by simply calling av_free().
3799 * @param codec if non-NULL, allocate private data and initialize defaults
3800 * for the given codec. It is illegal to then call avcodec_open()
3801 * with a different codec.
3803 * @return An AVCodecContext filled with default values or NULL on failure.
3804 * @see avcodec_get_context_defaults
3806 AVCodecContext *avcodec_alloc_context3(AVCodec *codec);
3809 * Copy the settings of the source AVCodecContext into the destination
3810 * AVCodecContext. The resulting destination codec context will be
3811 * unopened, i.e. you are required to call avcodec_open() before you
3812 * can use this AVCodecContext to decode/encode video/audio data.
3814 * @param dest target codec context, should be initialized with
3815 * avcodec_alloc_context3(), but otherwise uninitialized
3816 * @param src source codec context
3817 * @return AVERROR() on error (e.g. memory allocation error), 0 on success
3819 int avcodec_copy_context(AVCodecContext *dest, const AVCodecContext *src);
3822 * Set the fields of the given AVFrame to default values.
3824 * @param pic The AVFrame of which the fields should be set to default values.
3826 void avcodec_get_frame_defaults(AVFrame *pic);
3829 * Allocate an AVFrame and set its fields to default values. The resulting
3830 * struct can be deallocated by simply calling av_free().
3832 * @return An AVFrame filled with default values or NULL on failure.
3833 * @see avcodec_get_frame_defaults
3835 AVFrame *avcodec_alloc_frame(void);
3837 int avcodec_default_get_buffer(AVCodecContext *s, AVFrame *pic);
3838 void avcodec_default_release_buffer(AVCodecContext *s, AVFrame *pic);
3839 int avcodec_default_reget_buffer(AVCodecContext *s, AVFrame *pic);
3842 * Return the amount of padding in pixels which the get_buffer callback must
3843 * provide around the edge of the image for codecs which do not have the
3844 * CODEC_FLAG_EMU_EDGE flag.
3846 * @return Required padding in pixels.
3848 unsigned avcodec_get_edge_width(void);
3850 * Modify width and height values so that they will result in a memory
3851 * buffer that is acceptable for the codec if you do not use any horizontal
3854 * May only be used if a codec with CODEC_CAP_DR1 has been opened.
3855 * If CODEC_FLAG_EMU_EDGE is not set, the dimensions must have been increased
3856 * according to avcodec_get_edge_width() before.
3858 void avcodec_align_dimensions(AVCodecContext *s, int *width, int *height);
3860 * Modify width and height values so that they will result in a memory
3861 * buffer that is acceptable for the codec if you also ensure that all
3862 * line sizes are a multiple of the respective linesize_align[i].
3864 * May only be used if a codec with CODEC_CAP_DR1 has been opened.
3865 * If CODEC_FLAG_EMU_EDGE is not set, the dimensions must have been increased
3866 * according to avcodec_get_edge_width() before.
3868 void avcodec_align_dimensions2(AVCodecContext *s, int *width, int *height,
3869 int linesize_align[4]);
3871 enum PixelFormat avcodec_default_get_format(struct AVCodecContext *s, const enum PixelFormat * fmt);
3873 #if FF_API_THREAD_INIT
3875 * @deprecated Set s->thread_count before calling avcodec_open() instead of calling this.
3877 attribute_deprecated
3878 int avcodec_thread_init(AVCodecContext *s, int thread_count);
3881 int avcodec_default_execute(AVCodecContext *c, int (*func)(AVCodecContext *c2, void *arg2),void *arg, int *ret, int count, int size);
3882 int avcodec_default_execute2(AVCodecContext *c, int (*func)(AVCodecContext *c2, void *arg2, int, int),void *arg, int *ret, int count);
3883 //FIXME func typedef
3885 #if FF_API_AVCODEC_OPEN
3887 * Initialize the AVCodecContext to use the given AVCodec. Prior to using this
3888 * function the context has to be allocated.
3890 * The functions avcodec_find_decoder_by_name(), avcodec_find_encoder_by_name(),
3891 * avcodec_find_decoder() and avcodec_find_encoder() provide an easy way for
3892 * retrieving a codec.
3894 * @warning This function is not thread safe!
3897 * avcodec_register_all();
3898 * codec = avcodec_find_decoder(CODEC_ID_H264);
3902 * context = avcodec_alloc_context3(codec);
3904 * if (avcodec_open(context, codec) < 0)
3908 * @param avctx The context which will be set up to use the given codec.
3909 * @param codec The codec to use within the context.
3910 * @return zero on success, a negative value on error
3911 * @see avcodec_alloc_context3, avcodec_find_decoder, avcodec_find_encoder, avcodec_close
3913 * @deprecated use avcodec_open2
3915 attribute_deprecated
3916 int avcodec_open(AVCodecContext *avctx, AVCodec *codec);
3920 * Initialize the AVCodecContext to use the given AVCodec. Prior to using this
3921 * function the context has to be allocated with avcodec_alloc_context().
3923 * The functions avcodec_find_decoder_by_name(), avcodec_find_encoder_by_name(),
3924 * avcodec_find_decoder() and avcodec_find_encoder() provide an easy way for
3925 * retrieving a codec.
3927 * @warning This function is not thread safe!
3930 * avcodec_register_all();
3931 * av_dict_set(&opts, "b", "2.5M", 0);
3932 * codec = avcodec_find_decoder(CODEC_ID_H264);
3936 * context = avcodec_alloc_context();
3938 * if (avcodec_open(context, codec, opts) < 0)
3942 * @param avctx The context to initialize.
3943 * @param options A dictionary filled with AVCodecContext and codec-private options.
3944 * On return this object will be filled with options that were not found.
3946 * @return zero on success, a negative value on error
3947 * @see avcodec_alloc_context3(), avcodec_find_decoder(), avcodec_find_encoder(),
3948 * av_dict_set(), av_opt_find().
3950 int avcodec_open2(AVCodecContext *avctx, AVCodec *codec, AVDictionary **options);
3953 * Decode the audio frame of size avpkt->size from avpkt->data into samples.
3954 * Some decoders may support multiple frames in a single AVPacket, such
3955 * decoders would then just decode the first frame. In this case,
3956 * avcodec_decode_audio3 has to be called again with an AVPacket that contains
3957 * the remaining data in order to decode the second frame etc.
3959 * could be outputted, frame_size_ptr is zero. Otherwise, it is the
3960 * decompressed frame size in bytes.
3962 * @warning You must set frame_size_ptr to the allocated size of the
3963 * output buffer before calling avcodec_decode_audio3().
3965 * @warning The input buffer must be FF_INPUT_BUFFER_PADDING_SIZE larger than
3966 * the actual read bytes because some optimized bitstream readers read 32 or 64
3967 * bits at once and could read over the end.
3969 * @warning The end of the input buffer avpkt->data should be set to 0 to ensure that
3970 * no overreading happens for damaged MPEG streams.
3972 * @note You might have to align the input buffer avpkt->data and output buffer
3973 * samples. The alignment requirements depend on the CPU: On some CPUs it isn't
3974 * necessary at all, on others it won't work at all if not aligned and on others
3975 * it will work but it will have an impact on performance.
3977 * In practice, avpkt->data should have 4 byte alignment at minimum and
3978 * samples should be 16 byte aligned unless the CPU doesn't need it
3979 * (AltiVec and SSE do).
3981 * @note Codecs which have the CODEC_CAP_DELAY capability set have a delay
3982 * between input and output, these need to be fed with avpkt->data=NULL,
3983 * avpkt->size=0 at the end to return the remaining frames.
3985 * @param avctx the codec context
3986 * @param[out] samples the output buffer, sample type in avctx->sample_fmt
3987 * @param[in,out] frame_size_ptr the output buffer size in bytes
3988 * @param[in] avpkt The input AVPacket containing the input buffer.
3989 * You can create such packet with av_init_packet() and by then setting
3990 * data and size, some decoders might in addition need other fields.
3991 * All decoders are designed to use the least fields possible though.
3992 * @return On error a negative value is returned, otherwise the number of bytes
3993 * used or zero if no frame data was decompressed (used) from the input AVPacket.
3995 int avcodec_decode_audio3(AVCodecContext *avctx, int16_t *samples,
3996 int *frame_size_ptr,
4000 * Decode the video frame of size avpkt->size from avpkt->data into picture.
4001 * Some decoders may support multiple frames in a single AVPacket, such
4002 * decoders would then just decode the first frame.
4004 * @warning The input buffer must be FF_INPUT_BUFFER_PADDING_SIZE larger than
4005 * the actual read bytes because some optimized bitstream readers read 32 or 64
4006 * bits at once and could read over the end.
4008 * @warning The end of the input buffer buf should be set to 0 to ensure that
4009 * no overreading happens for damaged MPEG streams.
4011 * @note You might have to align the input buffer avpkt->data.
4012 * The alignment requirements depend on the CPU: on some CPUs it isn't
4013 * necessary at all, on others it won't work at all if not aligned and on others
4014 * it will work but it will have an impact on performance.
4016 * In practice, avpkt->data should have 4 byte alignment at minimum.
4018 * @note Codecs which have the CODEC_CAP_DELAY capability set have a delay
4019 * between input and output, these need to be fed with avpkt->data=NULL,
4020 * avpkt->size=0 at the end to return the remaining frames.
4022 * @param avctx the codec context
4023 * @param[out] picture The AVFrame in which the decoded video frame will be stored.
4024 * Use avcodec_alloc_frame to get an AVFrame, the codec will
4025 * allocate memory for the actual bitmap.
4026 * with default get/release_buffer(), the decoder frees/reuses the bitmap as it sees fit.
4027 * with overridden get/release_buffer() (needs CODEC_CAP_DR1) the user decides into what buffer the decoder
4028 * decodes and the decoder tells the user once it does not need the data anymore,
4029 * the user app can at this point free/reuse/keep the memory as it sees fit.
4031 * @param[in] avpkt The input AVpacket containing the input buffer.
4032 * You can create such packet with av_init_packet() and by then setting
4033 * data and size, some decoders might in addition need other fields like
4034 * flags&AV_PKT_FLAG_KEY. All decoders are designed to use the least
4036 * @param[in,out] got_picture_ptr Zero if no frame could be decompressed, otherwise, it is nonzero.
4037 * @return On error a negative value is returned, otherwise the number of bytes
4038 * used or zero if no frame could be decompressed.
4040 int avcodec_decode_video2(AVCodecContext *avctx, AVFrame *picture,
4041 int *got_picture_ptr,
4045 * Decode a subtitle message.
4046 * Return a negative value on error, otherwise return the number of bytes used.
4047 * If no subtitle could be decompressed, got_sub_ptr is zero.
4048 * Otherwise, the subtitle is stored in *sub.
4049 * Note that CODEC_CAP_DR1 is not available for subtitle codecs. This is for
4050 * simplicity, because the performance difference is expect to be negligible
4051 * and reusing a get_buffer written for video codecs would probably perform badly
4052 * due to a potentially very different allocation pattern.
4054 * @param avctx the codec context
4055 * @param[out] sub The AVSubtitle in which the decoded subtitle will be stored, must be
4056 freed with avsubtitle_free if *got_sub_ptr is set.
4057 * @param[in,out] got_sub_ptr Zero if no subtitle could be decompressed, otherwise, it is nonzero.
4058 * @param[in] avpkt The input AVPacket containing the input buffer.
4060 int avcodec_decode_subtitle2(AVCodecContext *avctx, AVSubtitle *sub,
4065 * Frees all allocated data in the given subtitle struct.
4067 * @param sub AVSubtitle to free.
4069 void avsubtitle_free(AVSubtitle *sub);
4072 * Encode an audio frame from samples into buf.
4074 * @note The output buffer should be at least FF_MIN_BUFFER_SIZE bytes large.
4075 * However, for PCM audio the user will know how much space is needed
4076 * because it depends on the value passed in buf_size as described
4077 * below. In that case a lower value can be used.
4079 * @param avctx the codec context
4080 * @param[out] buf the output buffer
4081 * @param[in] buf_size the output buffer size
4082 * @param[in] samples the input buffer containing the samples
4083 * The number of samples read from this buffer is frame_size*channels,
4084 * both of which are defined in avctx.
4085 * For PCM audio the number of samples read from samples is equal to
4086 * buf_size * input_sample_size / output_sample_size.
4087 * @return On error a negative value is returned, on success zero or the number
4088 * of bytes used to encode the data read from the input buffer.
4090 int avcodec_encode_audio(AVCodecContext *avctx, uint8_t *buf, int buf_size,
4091 const short *samples);
4094 * Encode a video frame from pict into buf.
4095 * The input picture should be
4096 * stored using a specific format, namely avctx.pix_fmt.
4098 * @param avctx the codec context
4099 * @param[out] buf the output buffer for the bitstream of encoded frame
4100 * @param[in] buf_size the size of the output buffer in bytes
4101 * @param[in] pict the input picture to encode
4102 * @return On error a negative value is returned, on success zero or the number
4103 * of bytes used from the output buffer.
4105 int avcodec_encode_video(AVCodecContext *avctx, uint8_t *buf, int buf_size,
4106 const AVFrame *pict);
4107 int avcodec_encode_subtitle(AVCodecContext *avctx, uint8_t *buf, int buf_size,
4108 const AVSubtitle *sub);
4110 int avcodec_close(AVCodecContext *avctx);
4113 * Register all the codecs, parsers and bitstream filters which were enabled at
4114 * configuration time. If you do not call this function you can select exactly
4115 * which formats you want to support, by using the individual registration
4118 * @see avcodec_register
4119 * @see av_register_codec_parser
4120 * @see av_register_bitstream_filter
4122 void avcodec_register_all(void);
4125 * Flush buffers, should be called when seeking or when switching to a different stream.
4127 void avcodec_flush_buffers(AVCodecContext *avctx);
4129 void avcodec_default_free_buffers(AVCodecContext *s);
4131 /* misc useful functions */
4133 #if FF_API_OLD_FF_PICT_TYPES
4135 * Return a single letter to describe the given picture type pict_type.
4137 * @param[in] pict_type the picture type
4138 * @return A single character representing the picture type.
4139 * @deprecated Use av_get_picture_type_char() instead.
4141 attribute_deprecated
4142 char av_get_pict_type_char(int pict_type);
4146 * Return codec bits per sample.
4148 * @param[in] codec_id the codec
4149 * @return Number of bits per sample or zero if unknown for the given codec.
4151 int av_get_bits_per_sample(enum CodecID codec_id);
4153 #if FF_API_OLD_SAMPLE_FMT
4155 * @deprecated Use av_get_bytes_per_sample() instead.
4157 attribute_deprecated
4158 int av_get_bits_per_sample_format(enum AVSampleFormat sample_fmt);
4162 typedef struct AVCodecParserContext {
4164 struct AVCodecParser *parser;
4165 int64_t frame_offset; /* offset of the current frame */
4166 int64_t cur_offset; /* current offset
4167 (incremented by each av_parser_parse()) */
4168 int64_t next_frame_offset; /* offset of the next frame */
4170 int pict_type; /* XXX: Put it back in AVCodecContext. */
4172 * This field is used for proper frame duration computation in lavf.
4173 * It signals, how much longer the frame duration of the current frame
4174 * is compared to normal frame duration.
4176 * frame_duration = (1 + repeat_pict) * time_base
4178 * It is used by codecs like H.264 to display telecined material.
4180 int repeat_pict; /* XXX: Put it back in AVCodecContext. */
4181 int64_t pts; /* pts of the current frame */
4182 int64_t dts; /* dts of the current frame */
4187 int fetch_timestamp;
4189 #define AV_PARSER_PTS_NB 4
4190 int cur_frame_start_index;
4191 int64_t cur_frame_offset[AV_PARSER_PTS_NB];
4192 int64_t cur_frame_pts[AV_PARSER_PTS_NB];
4193 int64_t cur_frame_dts[AV_PARSER_PTS_NB];
4196 #define PARSER_FLAG_COMPLETE_FRAMES 0x0001
4197 #define PARSER_FLAG_ONCE 0x0002
4198 /// Set if the parser has a valid file offset
4199 #define PARSER_FLAG_FETCHED_OFFSET 0x0004
4201 int64_t offset; ///< byte offset from starting packet start
4202 int64_t cur_frame_end[AV_PARSER_PTS_NB];
4205 * Set by parser to 1 for key frames and 0 for non-key frames.
4206 * It is initialized to -1, so if the parser doesn't set this flag,
4207 * old-style fallback using AV_PICTURE_TYPE_I picture type as key frames
4213 * Time difference in stream time base units from the pts of this
4214 * packet to the point at which the output from the decoder has converged
4215 * independent from the availability of previous frames. That is, the
4216 * frames are virtually identical no matter if decoding started from
4217 * the very first frame or from this keyframe.
4218 * Is AV_NOPTS_VALUE if unknown.
4219 * This field is not the display duration of the current frame.
4220 * This field has no meaning if the packet does not have AV_PKT_FLAG_KEY
4223 * The purpose of this field is to allow seeking in streams that have no
4224 * keyframes in the conventional sense. It corresponds to the
4225 * recovery point SEI in H.264 and match_time_delta in NUT. It is also
4226 * essential for some types of subtitle streams to ensure that all
4227 * subtitles are correctly displayed after seeking.
4229 int64_t convergence_duration;
4231 // Timestamp generation support:
4233 * Synchronization point for start of timestamp generation.
4235 * Set to >0 for sync point, 0 for no sync point and <0 for undefined
4238 * For example, this corresponds to presence of H.264 buffering period
4244 * Offset of the current timestamp against last timestamp sync point in
4245 * units of AVCodecContext.time_base.
4247 * Set to INT_MIN when dts_sync_point unused. Otherwise, it must
4248 * contain a valid timestamp offset.
4250 * Note that the timestamp of sync point has usually a nonzero
4251 * dts_ref_dts_delta, which refers to the previous sync point. Offset of
4252 * the next frame after timestamp sync point will be usually 1.
4254 * For example, this corresponds to H.264 cpb_removal_delay.
4256 int dts_ref_dts_delta;
4259 * Presentation delay of current frame in units of AVCodecContext.time_base.
4261 * Set to INT_MIN when dts_sync_point unused. Otherwise, it must
4262 * contain valid non-negative timestamp delta (presentation time of a frame
4263 * must not lie in the past).
4265 * This delay represents the difference between decoding and presentation
4266 * time of the frame.
4268 * For example, this corresponds to H.264 dpb_output_delay.
4273 * Position of the packet in file.
4275 * Analogous to cur_frame_pts/dts
4277 int64_t cur_frame_pos[AV_PARSER_PTS_NB];
4280 * Byte position of currently parsed frame in stream.
4285 * Previous frame byte position.
4288 } AVCodecParserContext;
4290 typedef struct AVCodecParser {
4291 int codec_ids[5]; /* several codec IDs are permitted */
4293 int (*parser_init)(AVCodecParserContext *s);
4294 int (*parser_parse)(AVCodecParserContext *s,
4295 AVCodecContext *avctx,
4296 const uint8_t **poutbuf, int *poutbuf_size,
4297 const uint8_t *buf, int buf_size);
4298 void (*parser_close)(AVCodecParserContext *s);
4299 int (*split)(AVCodecContext *avctx, const uint8_t *buf, int buf_size);
4300 struct AVCodecParser *next;
4303 AVCodecParser *av_parser_next(AVCodecParser *c);
4305 void av_register_codec_parser(AVCodecParser *parser);
4306 AVCodecParserContext *av_parser_init(int codec_id);
4311 * @param s parser context.
4312 * @param avctx codec context.
4313 * @param poutbuf set to pointer to parsed buffer or NULL if not yet finished.
4314 * @param poutbuf_size set to size of parsed buffer or zero if not yet finished.
4315 * @param buf input buffer.
4316 * @param buf_size input length, to signal EOF, this should be 0 (so that the last frame can be output).
4317 * @param pts input presentation timestamp.
4318 * @param dts input decoding timestamp.
4319 * @param pos input byte position in stream.
4320 * @return the number of bytes of the input bitstream used.
4325 * len = av_parser_parse2(myparser, AVCodecContext, &data, &size,
4332 * decode_frame(data, size);
4336 int av_parser_parse2(AVCodecParserContext *s,
4337 AVCodecContext *avctx,
4338 uint8_t **poutbuf, int *poutbuf_size,
4339 const uint8_t *buf, int buf_size,
4340 int64_t pts, int64_t dts,
4343 int av_parser_change(AVCodecParserContext *s,
4344 AVCodecContext *avctx,
4345 uint8_t **poutbuf, int *poutbuf_size,
4346 const uint8_t *buf, int buf_size, int keyframe);
4347 void av_parser_close(AVCodecParserContext *s);
4350 typedef struct AVBitStreamFilterContext {
4352 struct AVBitStreamFilter *filter;
4353 AVCodecParserContext *parser;
4354 struct AVBitStreamFilterContext *next;
4355 } AVBitStreamFilterContext;
4358 typedef struct AVBitStreamFilter {
4361 int (*filter)(AVBitStreamFilterContext *bsfc,
4362 AVCodecContext *avctx, const char *args,
4363 uint8_t **poutbuf, int *poutbuf_size,
4364 const uint8_t *buf, int buf_size, int keyframe);
4365 void (*close)(AVBitStreamFilterContext *bsfc);
4366 struct AVBitStreamFilter *next;
4367 } AVBitStreamFilter;
4369 void av_register_bitstream_filter(AVBitStreamFilter *bsf);
4370 AVBitStreamFilterContext *av_bitstream_filter_init(const char *name);
4371 int av_bitstream_filter_filter(AVBitStreamFilterContext *bsfc,
4372 AVCodecContext *avctx, const char *args,
4373 uint8_t **poutbuf, int *poutbuf_size,
4374 const uint8_t *buf, int buf_size, int keyframe);
4375 void av_bitstream_filter_close(AVBitStreamFilterContext *bsf);
4377 AVBitStreamFilter *av_bitstream_filter_next(AVBitStreamFilter *f);
4382 * Reallocate the given block if it is not large enough, otherwise do nothing.
4386 void *av_fast_realloc(void *ptr, unsigned int *size, size_t min_size);
4389 * Allocate a buffer, reusing the given one if large enough.
4391 * Contrary to av_fast_realloc the current buffer contents might not be
4392 * preserved and on error the old buffer is freed, thus no special
4393 * handling to avoid memleaks is necessary.
4395 * @param ptr pointer to pointer to already allocated buffer, overwritten with pointer to new buffer
4396 * @param size size of the buffer *ptr points to
4397 * @param min_size minimum size of *ptr buffer after returning, *ptr will be NULL and
4398 * *size 0 if an error occurred.
4400 void av_fast_malloc(void *ptr, unsigned int *size, size_t min_size);
4403 * Copy image src to dst. Wraps av_picture_data_copy() above.
4405 void av_picture_copy(AVPicture *dst, const AVPicture *src,
4406 enum PixelFormat pix_fmt, int width, int height);
4409 * Crop image top and left side.
4411 int av_picture_crop(AVPicture *dst, const AVPicture *src,
4412 enum PixelFormat pix_fmt, int top_band, int left_band);
4417 int av_picture_pad(AVPicture *dst, const AVPicture *src, int height, int width, enum PixelFormat pix_fmt,
4418 int padtop, int padbottom, int padleft, int padright, int *color);
4421 * Encode extradata length to a buffer. Used by xiph codecs.
4423 * @param s buffer to write to; must be at least (v/255+1) bytes long
4424 * @param v size of extradata in bytes
4425 * @return number of bytes written to the buffer.
4427 unsigned int av_xiphlacing(unsigned char *s, unsigned int v);
4430 * Logs a generic warning message about a missing feature. This function is
4431 * intended to be used internally by FFmpeg (libavcodec, libavformat, etc.)
4432 * only, and would normally not be used by applications.
4433 * @param[in] avc a pointer to an arbitrary struct of which the first field is
4434 * a pointer to an AVClass struct
4435 * @param[in] feature string containing the name of the missing feature
4436 * @param[in] want_sample indicates if samples are wanted which exhibit this feature.
4437 * If want_sample is non-zero, additional verbage will be added to the log
4438 * message which tells the user how to report samples to the development
4441 void av_log_missing_feature(void *avc, const char *feature, int want_sample);
4444 * Log a generic warning message asking for a sample. This function is
4445 * intended to be used internally by FFmpeg (libavcodec, libavformat, etc.)
4446 * only, and would normally not be used by applications.
4447 * @param[in] avc a pointer to an arbitrary struct of which the first field is
4448 * a pointer to an AVClass struct
4449 * @param[in] msg string containing an optional message, or NULL if no message
4451 void av_log_ask_for_sample(void *avc, const char *msg, ...) av_printf_format(2, 3);
4454 * Register the hardware accelerator hwaccel.
4456 void av_register_hwaccel(AVHWAccel *hwaccel);
4459 * If hwaccel is NULL, returns the first registered hardware accelerator,
4460 * if hwaccel is non-NULL, returns the next registered hardware accelerator
4461 * after hwaccel, or NULL if hwaccel is the last one.
4463 AVHWAccel *av_hwaccel_next(AVHWAccel *hwaccel);
4467 * Lock operation used by lockmgr
4470 AV_LOCK_CREATE, ///< Create a mutex
4471 AV_LOCK_OBTAIN, ///< Lock the mutex
4472 AV_LOCK_RELEASE, ///< Unlock the mutex
4473 AV_LOCK_DESTROY, ///< Free mutex resources
4477 * Register a user provided lock manager supporting the operations
4478 * specified by AVLockOp. mutex points to a (void *) where the
4479 * lockmgr should store/get a pointer to a user allocated mutex. It's
4480 * NULL upon AV_LOCK_CREATE and != NULL for all other ops.
4482 * @param cb User defined callback. Note: FFmpeg may invoke calls to this
4483 * callback during the call to av_lockmgr_register().
4484 * Thus, the application must be prepared to handle that.
4485 * If cb is set to NULL the lockmgr will be unregistered.
4486 * Also note that during unregistration the previously registered
4487 * lockmgr callback may also be invoked.
4489 int av_lockmgr_register(int (*cb)(void **mutex, enum AVLockOp op));
4492 * Get the type of the given codec.
4494 enum AVMediaType avcodec_get_type(enum CodecID codec_id);
4497 * Get the AVClass for AVCodecContext. It can be used in combination with
4498 * AV_OPT_SEARCH_FAKE_OBJ for examining options.
4500 * @see av_opt_find().
4502 const AVClass *avcodec_get_class(void);
4504 #endif /* AVCODEC_AVCODEC_H */