2 * copyright (c) 2001 Fabrice Bellard
4 * This file is part of Libav.
6 * Libav 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 * Libav 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 Libav; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21 #ifndef AVCODEC_AVCODEC_H
22 #define AVCODEC_AVCODEC_H
30 #include "libavutil/samplefmt.h"
31 #include "libavutil/avutil.h"
32 #include "libavutil/cpu.h"
33 #include "libavutil/dict.h"
34 #include "libavutil/log.h"
35 #include "libavutil/pixfmt.h"
36 #include "libavutil/rational.h"
38 #include "libavcodec/version.h"
40 * @defgroup libavc Encoding/Decoding Library
43 * @defgroup lavc_decoding Decoding
47 * @defgroup lavc_encoding Encoding
51 * @defgroup lavc_codec Codecs
53 * @defgroup lavc_codec_native Native Codecs
56 * @defgroup lavc_codec_wrappers External library wrappers
59 * @defgroup lavc_codec_hwaccel Hardware Accelerators bridge
63 * @defgroup lavc_internal Internal
72 * Identify the syntax and semantics of the bitstream.
73 * The principle is roughly:
74 * Two decoders with the same ID can decode the same streams.
75 * Two encoders with the same ID can encode compatible streams.
76 * There may be slight deviations from the principle due to implementation
79 * If you add a codec ID to this list, add it so that
80 * 1. no value of a existing codec ID changes (that would break ABI),
81 * 2. it is as close as possible to similar codecs.
88 CODEC_ID_MPEG2VIDEO, ///< preferred ID for MPEG-1/2 video decoding
89 CODEC_ID_MPEG2VIDEO_XVMC,
126 CODEC_ID_INTERPLAY_VIDEO,
138 CODEC_ID_TRUEMOTION1,
165 CODEC_ID_TRUEMOTION2,
182 CODEC_ID_DSICINVIDEO,
183 CODEC_ID_TIERTEXSEQVIDEO,
186 #if LIBAVCODEC_VERSION_MAJOR == 53
194 CODEC_ID_BETHSOFTVID,
206 #if LIBAVCODEC_VERSION_MAJOR == 53
214 CODEC_ID_MOTIONPIXELS,
232 CODEC_ID_IFF_BYTERUN1,
248 #if LIBAVCODEC_VERSION_MAJOR == 53
259 /* various PCM "codecs" */
260 CODEC_ID_FIRST_AUDIO = 0x10000, ///< A dummy id pointing at the start of audio codecs
261 CODEC_ID_PCM_S16LE = 0x10000,
277 CODEC_ID_PCM_S24DAUD,
279 CODEC_ID_PCM_S16LE_PLANAR,
288 CODEC_ID_PCM_S8_PLANAR,
290 /* various ADPCM codecs */
291 CODEC_ID_ADPCM_IMA_QT = 0x11000,
292 CODEC_ID_ADPCM_IMA_WAV,
293 CODEC_ID_ADPCM_IMA_DK3,
294 CODEC_ID_ADPCM_IMA_DK4,
295 CODEC_ID_ADPCM_IMA_WS,
296 CODEC_ID_ADPCM_IMA_SMJPEG,
305 CODEC_ID_ADPCM_YAMAHA,
306 CODEC_ID_ADPCM_SBPRO_4,
307 CODEC_ID_ADPCM_SBPRO_3,
308 CODEC_ID_ADPCM_SBPRO_2,
310 CODEC_ID_ADPCM_IMA_AMV,
311 CODEC_ID_ADPCM_EA_R1,
312 CODEC_ID_ADPCM_EA_R3,
313 CODEC_ID_ADPCM_EA_R2,
314 CODEC_ID_ADPCM_IMA_EA_SEAD,
315 CODEC_ID_ADPCM_IMA_EA_EACS,
316 CODEC_ID_ADPCM_EA_XAS,
317 CODEC_ID_ADPCM_EA_MAXIS_XA,
318 CODEC_ID_ADPCM_IMA_ISS,
320 CODEC_ID_ADPCM_IMA_APC,
323 CODEC_ID_AMR_NB = 0x12000,
326 /* RealAudio codecs*/
327 CODEC_ID_RA_144 = 0x13000,
330 /* various DPCM codecs */
331 CODEC_ID_ROQ_DPCM = 0x14000,
332 CODEC_ID_INTERPLAY_DPCM,
337 CODEC_ID_MP2 = 0x15000,
338 CODEC_ID_MP3, ///< preferred ID for decoding MPEG audio layer 1, 2 or 3
349 #if LIBAVCODEC_VERSION_MAJOR == 53
358 CODEC_ID_WESTWOOD_SND1,
359 CODEC_ID_GSM, ///< as in Berlin toast format
367 CODEC_ID_DSICINAUDIO,
371 CODEC_ID_GSM_MS, /* as found in WAV */
380 CODEC_ID_WMALOSSLESS,
389 CODEC_ID_BINKAUDIO_RDFT,
390 CODEC_ID_BINKAUDIO_DCT,
394 #if LIBAVCODEC_VERSION_MAJOR > 53
402 /* subtitle codecs */
403 CODEC_ID_FIRST_SUBTITLE = 0x17000, ///< A dummy ID pointing at the start of subtitle codecs.
404 CODEC_ID_DVD_SUBTITLE = 0x17000,
405 CODEC_ID_DVB_SUBTITLE,
406 CODEC_ID_TEXT, ///< raw UTF-8 text
410 CODEC_ID_HDMV_PGS_SUBTITLE,
411 CODEC_ID_DVB_TELETEXT,
414 /* other specific kind of codecs (generally used for attachments) */
415 CODEC_ID_FIRST_UNKNOWN = 0x18000, ///< A dummy ID pointing at the start of various fake codecs.
416 CODEC_ID_TTF = 0x18000,
418 CODEC_ID_PROBE = 0x19000, ///< codec_id is not known (like CODEC_ID_NONE) but lavf should attempt to identify it
420 CODEC_ID_MPEG2TS = 0x20000, /**< _FAKE_ codec to indicate a raw MPEG-2 TS
421 * stream (only used by libavformat) */
422 CODEC_ID_MPEG4SYSTEMS = 0x20001, /**< _FAKE_ codec to indicate a MPEG-4 Systems
423 * stream (only used by libavformat) */
424 CODEC_ID_FFMETADATA = 0x21000, ///< Dummy codec for streams containing only metadata information.
427 #if FF_API_OLD_SAMPLE_FMT
428 #define SampleFormat AVSampleFormat
430 #define SAMPLE_FMT_NONE AV_SAMPLE_FMT_NONE
431 #define SAMPLE_FMT_U8 AV_SAMPLE_FMT_U8
432 #define SAMPLE_FMT_S16 AV_SAMPLE_FMT_S16
433 #define SAMPLE_FMT_S32 AV_SAMPLE_FMT_S32
434 #define SAMPLE_FMT_FLT AV_SAMPLE_FMT_FLT
435 #define SAMPLE_FMT_DBL AV_SAMPLE_FMT_DBL
436 #define SAMPLE_FMT_NB AV_SAMPLE_FMT_NB
439 #if FF_API_OLD_AUDIOCONVERT
440 #include "libavutil/audioconvert.h"
442 /* Audio channel masks */
443 #define CH_FRONT_LEFT AV_CH_FRONT_LEFT
444 #define CH_FRONT_RIGHT AV_CH_FRONT_RIGHT
445 #define CH_FRONT_CENTER AV_CH_FRONT_CENTER
446 #define CH_LOW_FREQUENCY AV_CH_LOW_FREQUENCY
447 #define CH_BACK_LEFT AV_CH_BACK_LEFT
448 #define CH_BACK_RIGHT AV_CH_BACK_RIGHT
449 #define CH_FRONT_LEFT_OF_CENTER AV_CH_FRONT_LEFT_OF_CENTER
450 #define CH_FRONT_RIGHT_OF_CENTER AV_CH_FRONT_RIGHT_OF_CENTER
451 #define CH_BACK_CENTER AV_CH_BACK_CENTER
452 #define CH_SIDE_LEFT AV_CH_SIDE_LEFT
453 #define CH_SIDE_RIGHT AV_CH_SIDE_RIGHT
454 #define CH_TOP_CENTER AV_CH_TOP_CENTER
455 #define CH_TOP_FRONT_LEFT AV_CH_TOP_FRONT_LEFT
456 #define CH_TOP_FRONT_CENTER AV_CH_TOP_FRONT_CENTER
457 #define CH_TOP_FRONT_RIGHT AV_CH_TOP_FRONT_RIGHT
458 #define CH_TOP_BACK_LEFT AV_CH_TOP_BACK_LEFT
459 #define CH_TOP_BACK_CENTER AV_CH_TOP_BACK_CENTER
460 #define CH_TOP_BACK_RIGHT AV_CH_TOP_BACK_RIGHT
461 #define CH_STEREO_LEFT AV_CH_STEREO_LEFT
462 #define CH_STEREO_RIGHT AV_CH_STEREO_RIGHT
464 /** Channel mask value used for AVCodecContext.request_channel_layout
465 to indicate that the user requests the channel order of the decoder output
466 to be the native codec channel order. */
467 #define CH_LAYOUT_NATIVE AV_CH_LAYOUT_NATIVE
469 /* Audio channel convenience macros */
470 #define CH_LAYOUT_MONO AV_CH_LAYOUT_MONO
471 #define CH_LAYOUT_STEREO AV_CH_LAYOUT_STEREO
472 #define CH_LAYOUT_2_1 AV_CH_LAYOUT_2_1
473 #define CH_LAYOUT_SURROUND AV_CH_LAYOUT_SURROUND
474 #define CH_LAYOUT_4POINT0 AV_CH_LAYOUT_4POINT0
475 #define CH_LAYOUT_2_2 AV_CH_LAYOUT_2_2
476 #define CH_LAYOUT_QUAD AV_CH_LAYOUT_QUAD
477 #define CH_LAYOUT_5POINT0 AV_CH_LAYOUT_5POINT0
478 #define CH_LAYOUT_5POINT1 AV_CH_LAYOUT_5POINT1
479 #define CH_LAYOUT_5POINT0_BACK AV_CH_LAYOUT_5POINT0_BACK
480 #define CH_LAYOUT_5POINT1_BACK AV_CH_LAYOUT_5POINT1_BACK
481 #define CH_LAYOUT_7POINT0 AV_CH_LAYOUT_7POINT0
482 #define CH_LAYOUT_7POINT1 AV_CH_LAYOUT_7POINT1
483 #define CH_LAYOUT_7POINT1_WIDE AV_CH_LAYOUT_7POINT1_WIDE
484 #define CH_LAYOUT_STEREO_DOWNMIX AV_CH_LAYOUT_STEREO_DOWNMIX
487 #if FF_API_OLD_DECODE_AUDIO
489 #define AVCODEC_MAX_AUDIO_FRAME_SIZE 192000 // 1 second of 48khz 32bit audio
493 * Required number of additionally allocated bytes at the end of the input bitstream for decoding.
494 * This is mainly needed because some optimized bitstream readers read
495 * 32 or 64 bit at once and could read over the end.<br>
496 * Note: If the first 23 bits of the additional bytes are not 0, then damaged
497 * MPEG bitstreams could cause overread and segfault.
499 #define FF_INPUT_BUFFER_PADDING_SIZE 8
502 * minimum encoding buffer size
503 * Used to avoid some checks during header writing.
505 #define FF_MIN_BUFFER_SIZE 16384
509 * motion estimation type.
512 ME_ZERO = 1, ///< no search, that is use 0,0 vector whenever one is needed
516 ME_EPZS, ///< enhanced predictive zonal search
517 ME_X1, ///< reserved for experiments
518 ME_HEX, ///< hexagon based search
519 ME_UMH, ///< uneven multi-hexagon search
520 ME_ITER, ///< iterative search
521 ME_TESA, ///< transformed exhaustive search algorithm
525 /* We leave some space between them for extensions (drop some
526 * keyframes for intra-only or drop just some bidir frames). */
527 AVDISCARD_NONE =-16, ///< discard nothing
528 AVDISCARD_DEFAULT= 0, ///< discard useless packets like 0 size packets in avi
529 AVDISCARD_NONREF = 8, ///< discard all non reference
530 AVDISCARD_BIDIR = 16, ///< discard all bidirectional frames
531 AVDISCARD_NONKEY = 32, ///< discard all frames except keyframes
532 AVDISCARD_ALL = 48, ///< discard all
535 enum AVColorPrimaries{
536 AVCOL_PRI_BT709 =1, ///< also ITU-R BT1361 / IEC 61966-2-4 / SMPTE RP177 Annex B
537 AVCOL_PRI_UNSPECIFIED=2,
539 AVCOL_PRI_BT470BG =5, ///< also ITU-R BT601-6 625 / ITU-R BT1358 625 / ITU-R BT1700 625 PAL & SECAM
540 AVCOL_PRI_SMPTE170M =6, ///< also ITU-R BT601-6 525 / ITU-R BT1358 525 / ITU-R BT1700 NTSC
541 AVCOL_PRI_SMPTE240M =7, ///< functionally identical to above
543 AVCOL_PRI_NB , ///< Not part of ABI
546 enum AVColorTransferCharacteristic{
547 AVCOL_TRC_BT709 =1, ///< also ITU-R BT1361
548 AVCOL_TRC_UNSPECIFIED=2,
549 AVCOL_TRC_GAMMA22 =4, ///< also ITU-R BT470M / ITU-R BT1700 625 PAL & SECAM
550 AVCOL_TRC_GAMMA28 =5, ///< also ITU-R BT470BG
551 AVCOL_TRC_NB , ///< Not part of ABI
556 AVCOL_SPC_BT709 =1, ///< also ITU-R BT1361 / IEC 61966-2-4 xvYCC709 / SMPTE RP177 Annex B
557 AVCOL_SPC_UNSPECIFIED=2,
559 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
560 AVCOL_SPC_SMPTE170M =6, ///< also ITU-R BT601-6 525 / ITU-R BT1358 525 / ITU-R BT1700 NTSC / functionally identical to above
561 AVCOL_SPC_SMPTE240M =7,
562 AVCOL_SPC_NB , ///< Not part of ABI
566 AVCOL_RANGE_UNSPECIFIED=0,
567 AVCOL_RANGE_MPEG =1, ///< the normal 219*2^(n-8) "MPEG" YUV ranges
568 AVCOL_RANGE_JPEG =2, ///< the normal 2^n-1 "JPEG" YUV ranges
569 AVCOL_RANGE_NB , ///< Not part of ABI
573 * X X 3 4 X X are luma samples,
574 * 1 2 1-6 are possible chroma positions
575 * X X 5 6 X 0 is undefined/unknown position
577 enum AVChromaLocation{
578 AVCHROMA_LOC_UNSPECIFIED=0,
579 AVCHROMA_LOC_LEFT =1, ///< mpeg2/4, h264 default
580 AVCHROMA_LOC_CENTER =2, ///< mpeg1, jpeg, h263
581 AVCHROMA_LOC_TOPLEFT =3, ///< DV
583 AVCHROMA_LOC_BOTTOMLEFT =5,
584 AVCHROMA_LOC_BOTTOM =6,
585 AVCHROMA_LOC_NB , ///< Not part of ABI
588 #if FF_API_FLAC_GLOBAL_OPTS
593 AV_LPC_TYPE_DEFAULT = -1, ///< use the codec default LPC type
594 AV_LPC_TYPE_NONE = 0, ///< do not use LPC prediction or use all zero coefficients
595 AV_LPC_TYPE_FIXED = 1, ///< fixed LPC coefficients
596 AV_LPC_TYPE_LEVINSON = 2, ///< Levinson-Durbin recursion
597 AV_LPC_TYPE_CHOLESKY = 3, ///< Cholesky factorization
598 AV_LPC_TYPE_NB , ///< Not part of ABI
602 enum AVAudioServiceType {
603 AV_AUDIO_SERVICE_TYPE_MAIN = 0,
604 AV_AUDIO_SERVICE_TYPE_EFFECTS = 1,
605 AV_AUDIO_SERVICE_TYPE_VISUALLY_IMPAIRED = 2,
606 AV_AUDIO_SERVICE_TYPE_HEARING_IMPAIRED = 3,
607 AV_AUDIO_SERVICE_TYPE_DIALOGUE = 4,
608 AV_AUDIO_SERVICE_TYPE_COMMENTARY = 5,
609 AV_AUDIO_SERVICE_TYPE_EMERGENCY = 6,
610 AV_AUDIO_SERVICE_TYPE_VOICE_OVER = 7,
611 AV_AUDIO_SERVICE_TYPE_KARAOKE = 8,
612 AV_AUDIO_SERVICE_TYPE_NB , ///< Not part of ABI
615 typedef struct RcOverride{
618 int qscale; // If this is 0 then quality_factor will be used instead.
619 float quality_factor;
622 #define FF_MAX_B_FRAMES 16
625 These flags can be passed in AVCodecContext.flags before initialization.
626 Note: Not everything is supported yet.
629 #define CODEC_FLAG_QSCALE 0x0002 ///< Use fixed qscale.
630 #define CODEC_FLAG_4MV 0x0004 ///< 4 MV per MB allowed / advanced prediction for H.263.
631 #define CODEC_FLAG_QPEL 0x0010 ///< Use qpel MC.
632 #define CODEC_FLAG_GMC 0x0020 ///< Use GMC.
633 #define CODEC_FLAG_MV0 0x0040 ///< Always try a MB with MV=<0,0>.
635 * The parent program guarantees that the input for B-frames containing
636 * streams is not written to for at least s->max_b_frames+1 frames, if
637 * this is not set the input will be copied.
639 #define CODEC_FLAG_INPUT_PRESERVED 0x0100
640 #define CODEC_FLAG_PASS1 0x0200 ///< Use internal 2pass ratecontrol in first pass mode.
641 #define CODEC_FLAG_PASS2 0x0400 ///< Use internal 2pass ratecontrol in second pass mode.
642 #define CODEC_FLAG_GRAY 0x2000 ///< Only decode/encode grayscale.
643 #define CODEC_FLAG_EMU_EDGE 0x4000 ///< Don't draw edges.
644 #define CODEC_FLAG_PSNR 0x8000 ///< error[?] variables will be set during encoding.
645 #define CODEC_FLAG_TRUNCATED 0x00010000 /** Input bitstream might be truncated at a random
646 location instead of only at frame boundaries. */
647 #define CODEC_FLAG_NORMALIZE_AQP 0x00020000 ///< Normalize adaptive quantization.
648 #define CODEC_FLAG_INTERLACED_DCT 0x00040000 ///< Use interlaced DCT.
649 #define CODEC_FLAG_LOW_DELAY 0x00080000 ///< Force low delay.
650 #define CODEC_FLAG_GLOBAL_HEADER 0x00400000 ///< Place global headers in extradata instead of every keyframe.
651 #define CODEC_FLAG_BITEXACT 0x00800000 ///< Use only bitexact stuff (except (I)DCT).
652 /* Fx : Flag for h263+ extra options */
653 #define CODEC_FLAG_AC_PRED 0x01000000 ///< H.263 advanced intra coding / MPEG-4 AC prediction
654 #define CODEC_FLAG_CBP_RD 0x04000000 ///< Use rate distortion optimization for cbp.
655 #define CODEC_FLAG_QP_RD 0x08000000 ///< Use rate distortion optimization for qp selectioon.
656 #define CODEC_FLAG_LOOP_FILTER 0x00000800 ///< loop filter
657 #define CODEC_FLAG_INTERLACED_ME 0x20000000 ///< interlaced motion estimation
658 #define CODEC_FLAG_CLOSED_GOP 0x80000000
659 #define CODEC_FLAG2_FAST 0x00000001 ///< Allow non spec compliant speedup tricks.
660 #define CODEC_FLAG2_STRICT_GOP 0x00000002 ///< Strictly enforce GOP size.
661 #define CODEC_FLAG2_NO_OUTPUT 0x00000004 ///< Skip bitstream encoding.
662 #define CODEC_FLAG2_LOCAL_HEADER 0x00000008 ///< Place global headers at every keyframe instead of in extradata.
663 #define CODEC_FLAG2_SKIP_RD 0x00004000 ///< RD optimal MB level residual skipping
664 #define CODEC_FLAG2_CHUNKS 0x00008000 ///< Input bitstream might be truncated at a packet boundaries instead of only at frame boundaries.
666 * @defgroup deprecated_flags Deprecated codec flags
667 * Use corresponding private codec options instead.
670 #if FF_API_MJPEG_GLOBAL_OPTS
671 #define CODEC_FLAG_EXTERN_HUFF 0x1000 ///< Use external Huffman table (for MJPEG).
673 #if FF_API_SNOW_GLOBAL_OPTS
674 #define CODEC_FLAG2_MEMC_ONLY 0x00001000 ///< Only do ME/MC (I frames -> ref, P frame -> ME+MC).
676 #if FF_API_LAME_GLOBAL_OPTS
677 #define CODEC_FLAG2_BIT_RESERVOIR 0x00020000 ///< Use a bit reservoir when encoding if possible
683 /* Unsupported options :
684 * Syntax Arithmetic coding (SAC)
685 * Reference Picture Selection
686 * Independent Segment Decoding */
688 /* codec capabilities */
690 #define CODEC_CAP_DRAW_HORIZ_BAND 0x0001 ///< Decoder can use draw_horiz_band callback.
692 * Codec uses get_buffer() for allocating buffers and supports custom allocators.
693 * If not set, it might not use get_buffer() at all or use operations that
694 * assume the buffer was allocated by avcodec_default_get_buffer.
696 #define CODEC_CAP_DR1 0x0002
697 #if FF_API_PARSE_FRAME
698 /* If 'parse_only' field is true, then avcodec_parse_frame() can be used. */
699 #define CODEC_CAP_PARSE_ONLY 0x0004
701 #define CODEC_CAP_TRUNCATED 0x0008
702 /* Codec can export data for HW decoding (XvMC). */
703 #define CODEC_CAP_HWACCEL 0x0010
705 * Encoder or decoder requires flushing with NULL input at the end in order to
706 * give the complete and correct output.
708 * NOTE: If this flag is not set, the codec is guaranteed to never be fed with
709 * with NULL data. The user can still send NULL data to the public encode
710 * or decode function, but libavcodec will not pass it along to the codec
711 * unless this flag is set.
714 * The decoder has a non-zero delay and needs to be fed with avpkt->data=NULL,
715 * avpkt->size=0 at the end to get the delayed data until the decoder no longer
719 * The encoder needs to be fed with NULL data at the end of encoding until the
720 * encoder no longer returns data.
722 * NOTE: For encoders implementing the AVCodec.encode2() function, setting this
723 * flag also means that the encoder must set the pts and duration for
724 * each output packet. If this flag is not set, the pts and duration will
725 * be determined by libavcodec from the input frame.
727 #define CODEC_CAP_DELAY 0x0020
729 * Codec can be fed a final frame with a smaller size.
730 * This can be used to prevent truncation of the last audio samples.
732 #define CODEC_CAP_SMALL_LAST_FRAME 0x0040
734 * Codec can export data for HW decoding (VDPAU).
736 #define CODEC_CAP_HWACCEL_VDPAU 0x0080
738 * Codec can output multiple frames per AVPacket
739 * Normally demuxers return one frame at a time, demuxers which do not do
740 * are connected to a parser to split what they return into proper frames.
741 * This flag is reserved to the very rare category of codecs which have a
742 * bitstream that cannot be split into frames without timeconsuming
743 * operations like full decoding. Demuxers carring such bitstreams thus
744 * may return multiple frames in a packet. This has many disadvantages like
745 * prohibiting stream copy in many cases thus it should only be considered
748 #define CODEC_CAP_SUBFRAMES 0x0100
750 * Codec is experimental and is thus avoided in favor of non experimental
753 #define CODEC_CAP_EXPERIMENTAL 0x0200
755 * Codec should fill in channel configuration and samplerate instead of container
757 #define CODEC_CAP_CHANNEL_CONF 0x0400
759 * Codec is able to deal with negative linesizes
761 #define CODEC_CAP_NEG_LINESIZES 0x0800
763 * Codec supports frame-level multithreading.
765 #define CODEC_CAP_FRAME_THREADS 0x1000
767 * Codec supports slice-based (or partition-based) multithreading.
769 #define CODEC_CAP_SLICE_THREADS 0x2000
771 * Codec supports changed parameters at any point.
773 #define CODEC_CAP_PARAM_CHANGE 0x4000
775 * Codec supports avctx->thread_count == 0 (auto).
777 #define CODEC_CAP_AUTO_THREADS 0x8000
779 * Audio encoder supports receiving a different number of samples in each call.
781 #define CODEC_CAP_VARIABLE_FRAME_SIZE 0x10000
783 //The following defines may change, don't expect compatibility if you use them.
784 #define MB_TYPE_INTRA4x4 0x0001
785 #define MB_TYPE_INTRA16x16 0x0002 //FIXME H.264-specific
786 #define MB_TYPE_INTRA_PCM 0x0004 //FIXME H.264-specific
787 #define MB_TYPE_16x16 0x0008
788 #define MB_TYPE_16x8 0x0010
789 #define MB_TYPE_8x16 0x0020
790 #define MB_TYPE_8x8 0x0040
791 #define MB_TYPE_INTERLACED 0x0080
792 #define MB_TYPE_DIRECT2 0x0100 //FIXME
793 #define MB_TYPE_ACPRED 0x0200
794 #define MB_TYPE_GMC 0x0400
795 #define MB_TYPE_SKIP 0x0800
796 #define MB_TYPE_P0L0 0x1000
797 #define MB_TYPE_P1L0 0x2000
798 #define MB_TYPE_P0L1 0x4000
799 #define MB_TYPE_P1L1 0x8000
800 #define MB_TYPE_L0 (MB_TYPE_P0L0 | MB_TYPE_P1L0)
801 #define MB_TYPE_L1 (MB_TYPE_P0L1 | MB_TYPE_P1L1)
802 #define MB_TYPE_L0L1 (MB_TYPE_L0 | MB_TYPE_L1)
803 #define MB_TYPE_QUANT 0x00010000
804 #define MB_TYPE_CBP 0x00020000
805 //Note bits 24-31 are reserved for codec specific use (h264 ref0, mpeg1 0mv, ...)
809 * This specifies the area which should be displayed.
810 * Note there may be multiple such areas for one frame.
812 typedef struct AVPanScan{
815 * - encoding: Set by user.
816 * - decoding: Set by libavcodec.
821 * width and height in 1/16 pel
822 * - encoding: Set by user.
823 * - decoding: Set by libavcodec.
829 * position of the top left corner in 1/16 pel for up to 3 fields/frames
830 * - encoding: Set by user.
831 * - decoding: Set by libavcodec.
833 int16_t position[3][2];
836 #define FF_QSCALE_TYPE_MPEG1 0
837 #define FF_QSCALE_TYPE_MPEG2 1
838 #define FF_QSCALE_TYPE_H264 2
839 #define FF_QSCALE_TYPE_VP56 3
841 #define FF_BUFFER_TYPE_INTERNAL 1
842 #define FF_BUFFER_TYPE_USER 2 ///< direct rendering buffers (image is (de)allocated by user)
843 #define FF_BUFFER_TYPE_SHARED 4 ///< Buffer from somewhere else; don't deallocate image (data/base), all other tables are not shared.
844 #define FF_BUFFER_TYPE_COPY 8 ///< Just a (modified) copy of some other buffer, don't deallocate anything.
846 #if FF_API_OLD_FF_PICT_TYPES
847 /* DEPRECATED, directly use the AV_PICTURE_TYPE_* enum values */
848 #define FF_I_TYPE AV_PICTURE_TYPE_I ///< Intra
849 #define FF_P_TYPE AV_PICTURE_TYPE_P ///< Predicted
850 #define FF_B_TYPE AV_PICTURE_TYPE_B ///< Bi-dir predicted
851 #define FF_S_TYPE AV_PICTURE_TYPE_S ///< S(GMC)-VOP MPEG4
852 #define FF_SI_TYPE AV_PICTURE_TYPE_SI ///< Switching Intra
853 #define FF_SP_TYPE AV_PICTURE_TYPE_SP ///< Switching Predicted
854 #define FF_BI_TYPE AV_PICTURE_TYPE_BI
857 #define FF_BUFFER_HINTS_VALID 0x01 // Buffer hints value is meaningful (if 0 ignore).
858 #define FF_BUFFER_HINTS_READABLE 0x02 // Codec will read from buffer.
859 #define FF_BUFFER_HINTS_PRESERVE 0x04 // User must not alter buffer content.
860 #define FF_BUFFER_HINTS_REUSABLE 0x08 // Codec will reuse the buffer (update).
862 enum AVPacketSideDataType {
864 AV_PKT_DATA_NEW_EXTRADATA,
865 AV_PKT_DATA_PARAM_CHANGE,
868 typedef struct AVPacket {
870 * Presentation timestamp in AVStream->time_base units; the time at which
871 * the decompressed packet will be presented to the user.
872 * Can be AV_NOPTS_VALUE if it is not stored in the file.
873 * pts MUST be larger or equal to dts as presentation cannot happen before
874 * decompression, unless one wants to view hex dumps. Some formats misuse
875 * the terms dts and pts/cts to mean something different. Such timestamps
876 * must be converted to true pts/dts before they are stored in AVPacket.
880 * Decompression timestamp in AVStream->time_base units; the time at which
881 * the packet is decompressed.
882 * Can be AV_NOPTS_VALUE if it is not stored in the file.
889 * A combination of AV_PKT_FLAG values
893 * Additional packet data that can be provided by the container.
894 * Packet can contain several types of side information.
899 enum AVPacketSideDataType type;
904 * Duration of this packet in AVStream->time_base units, 0 if unknown.
905 * Equals next_pts - this_pts in presentation order.
908 void (*destruct)(struct AVPacket *);
910 int64_t pos; ///< byte position in stream, -1 if unknown
913 * Time difference in AVStream->time_base units from the pts of this
914 * packet to the point at which the output from the decoder has converged
915 * independent from the availability of previous frames. That is, the
916 * frames are virtually identical no matter if decoding started from
917 * the very first frame or from this keyframe.
918 * Is AV_NOPTS_VALUE if unknown.
919 * This field is not the display duration of the current packet.
920 * This field has no meaning if the packet does not have AV_PKT_FLAG_KEY
923 * The purpose of this field is to allow seeking in streams that have no
924 * keyframes in the conventional sense. It corresponds to the
925 * recovery point SEI in H.264 and match_time_delta in NUT. It is also
926 * essential for some types of subtitle streams to ensure that all
927 * subtitles are correctly displayed after seeking.
929 int64_t convergence_duration;
931 #define AV_PKT_FLAG_KEY 0x0001 ///< The packet contains a keyframe
932 #define AV_PKT_FLAG_CORRUPT 0x0002 ///< The packet content is corrupted
935 * An AV_PKT_DATA_PARAM_CHANGE side data packet is laid out as follows:
937 * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_COUNT)
938 * s32le channel_count
939 * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_LAYOUT)
940 * u64le channel_layout
941 * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_SAMPLE_RATE)
943 * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_DIMENSIONS)
948 enum AVSideDataParamChangeFlags {
949 AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_COUNT = 0x0001,
950 AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_LAYOUT = 0x0002,
951 AV_SIDE_DATA_PARAM_CHANGE_SAMPLE_RATE = 0x0004,
952 AV_SIDE_DATA_PARAM_CHANGE_DIMENSIONS = 0x0008,
957 * New fields can be added to the end of AVFRAME with minor version
958 * bumps. Removal, reordering and changes to existing fields require
959 * a major version bump.
960 * sizeof(AVFrame) must not be used outside libav*.
962 typedef struct AVFrame {
963 #if FF_API_DATA_POINTERS
964 #define AV_NUM_DATA_POINTERS 4
966 #define AV_NUM_DATA_POINTERS 8
969 * pointer to the picture/channel planes.
970 * This might be different from the first allocated byte
971 * - encoding: Set by user
972 * - decoding: set by AVCodecContext.get_buffer()
974 uint8_t *data[AV_NUM_DATA_POINTERS];
977 * Size, in bytes, of the data for each picture/channel plane.
979 * For audio, only linesize[0] may be set. For planar audio, each channel
980 * plane must be the same size.
982 * - encoding: Set by user (video only)
983 * - decoding: set by AVCodecContext.get_buffer()
985 int linesize[AV_NUM_DATA_POINTERS];
988 * pointer to the first allocated byte of the picture. Can be used in get_buffer/release_buffer.
989 * This isn't used by libavcodec unless the default get/release_buffer() is used.
993 uint8_t *base[AV_NUM_DATA_POINTERS];
995 * 1 -> keyframe, 0-> not
996 * - encoding: Set by libavcodec.
997 * - decoding: Set by libavcodec.
1002 * Picture type of the frame, see ?_TYPE below.
1003 * - encoding: Set by libavcodec. for coded_picture (and set by user for input).
1004 * - decoding: Set by libavcodec.
1006 enum AVPictureType pict_type;
1009 * presentation timestamp in time_base units (time when frame should be shown to user)
1010 * If AV_NOPTS_VALUE then frame_rate = 1/time_base will be assumed.
1011 * - encoding: MUST be set by user.
1012 * - decoding: Set by libavcodec.
1017 * picture number in bitstream order
1018 * - encoding: set by
1019 * - decoding: Set by libavcodec.
1021 int coded_picture_number;
1023 * picture number in display order
1024 * - encoding: set by
1025 * - decoding: Set by libavcodec.
1027 int display_picture_number;
1030 * quality (between 1 (good) and FF_LAMBDA_MAX (bad))
1031 * - encoding: Set by libavcodec. for coded_picture (and set by user for input).
1032 * - decoding: Set by libavcodec.
1036 #if FF_API_AVFRAME_AGE
1038 * @deprecated unused
1040 attribute_deprecated int age;
1044 * is this picture used as reference
1045 * The values for this are the same as the MpegEncContext.picture_structure
1046 * variable, that is 1->top field, 2->bottom field, 3->frame/both fields.
1047 * Set to 4 for delayed, non-reference frames.
1048 * - encoding: unused
1049 * - decoding: Set by libavcodec. (before get_buffer() call)).
1055 * - encoding: unused
1056 * - decoding: Set by libavcodec.
1058 int8_t *qscale_table;
1061 * - encoding: unused
1062 * - decoding: Set by libavcodec.
1067 * mbskip_table[mb]>=1 if MB didn't change
1068 * stride= mb_width = (width+15)>>4
1069 * - encoding: unused
1070 * - decoding: Set by libavcodec.
1072 uint8_t *mbskip_table;
1075 * motion vector table
1078 * int mv_sample_log2= 4 - motion_subsample_log2;
1079 * int mb_width= (width+15)>>4;
1080 * int mv_stride= (mb_width << mv_sample_log2) + 1;
1081 * motion_val[direction][x + y*mv_stride][0->mv_x, 1->mv_y];
1083 * - encoding: Set by user.
1084 * - decoding: Set by libavcodec.
1086 int16_t (*motion_val[2])[2];
1089 * macroblock type table
1090 * mb_type_base + mb_width + 2
1091 * - encoding: Set by user.
1092 * - decoding: Set by libavcodec.
1097 * log2 of the size of the block which a single vector in motion_val represents:
1098 * (4->16x16, 3->8x8, 2-> 4x4, 1-> 2x2)
1099 * - encoding: unused
1100 * - decoding: Set by libavcodec.
1102 uint8_t motion_subsample_log2;
1105 * for some private data of the user
1106 * - encoding: unused
1107 * - decoding: Set by user.
1113 * - encoding: Set by libavcodec. if flags&CODEC_FLAG_PSNR.
1114 * - decoding: unused
1116 uint64_t error[AV_NUM_DATA_POINTERS];
1119 * type of the buffer (to keep track of who has to deallocate data[*])
1120 * - encoding: Set by the one who allocates it.
1121 * - decoding: Set by the one who allocates it.
1122 * Note: User allocated (direct rendering) & internal buffers cannot coexist currently.
1127 * When decoding, this signals how much the picture must be delayed.
1128 * extra_delay = repeat_pict / (2*fps)
1129 * - encoding: unused
1130 * - decoding: Set by libavcodec.
1140 * The content of the picture is interlaced.
1141 * - encoding: Set by user.
1142 * - decoding: Set by libavcodec. (default 0)
1144 int interlaced_frame;
1147 * If the content is interlaced, is top field displayed first.
1148 * - encoding: Set by user.
1149 * - decoding: Set by libavcodec.
1151 int top_field_first;
1155 * - encoding: Set by user.
1156 * - decoding: Set by libavcodec.
1158 AVPanScan *pan_scan;
1161 * Tell user application that palette has changed from previous frame.
1162 * - encoding: ??? (no palette-enabled encoder yet)
1163 * - decoding: Set by libavcodec. (default 0).
1165 int palette_has_changed;
1168 * codec suggestion on buffer type if != 0
1169 * - encoding: unused
1170 * - decoding: Set by libavcodec. (before get_buffer() call)).
1176 * - encoding: unused
1177 * - decoding: Set by libavcodec.
1182 * motion reference frame index
1183 * the order in which these are stored can depend on the codec.
1184 * - encoding: Set by user.
1185 * - decoding: Set by libavcodec.
1187 int8_t *ref_index[2];
1190 * reordered opaque 64bit (generally an integer or a double precision float
1191 * PTS but can be anything).
1192 * The user sets AVCodecContext.reordered_opaque to represent the input at
1194 * the decoder reorders values as needed and sets AVFrame.reordered_opaque
1195 * to exactly one of the values provided by the user through AVCodecContext.reordered_opaque
1196 * @deprecated in favor of pkt_pts
1197 * - encoding: unused
1198 * - decoding: Read by user.
1200 int64_t reordered_opaque;
1203 * hardware accelerator private data (Libav-allocated)
1204 * - encoding: unused
1205 * - decoding: Set by libavcodec
1207 void *hwaccel_picture_private;
1210 * reordered pts from the last AVPacket that has been input into the decoder
1211 * - encoding: unused
1212 * - decoding: Read by user.
1217 * dts from the last AVPacket that has been input into the decoder
1218 * - encoding: unused
1219 * - decoding: Read by user.
1224 * the AVCodecContext which ff_thread_get_buffer() was last called on
1225 * - encoding: Set by libavcodec.
1226 * - decoding: Set by libavcodec.
1228 struct AVCodecContext *owner;
1231 * used by multithreading to store frame-specific info
1232 * - encoding: Set by libavcodec.
1233 * - decoding: Set by libavcodec.
1235 void *thread_opaque;
1238 * number of audio samples (per channel) described by this frame
1239 * - encoding: unused
1240 * - decoding: Set by libavcodec
1245 * pointers to the data planes/channels.
1247 * For video, this should simply point to data[].
1249 * For planar audio, each channel has a separate data pointer, and
1250 * linesize[0] contains the size of each channel buffer.
1251 * For packed audio, there is just one data pointer, and linesize[0]
1252 * contains the total size of the buffer for all channels.
1254 * Note: Both data and extended_data will always be set by get_buffer(),
1255 * but for planar audio with more channels that can fit in data,
1256 * extended_data must be used by the decoder in order to access all
1260 * decoding: set by AVCodecContext.get_buffer()
1262 uint8_t **extended_data;
1265 * sample aspect ratio for the video frame, 0/1 if unknown\unspecified
1266 * - encoding: unused
1267 * - decoding: Read by user.
1269 AVRational sample_aspect_ratio;
1272 * width and height of the video frame
1273 * - encoding: unused
1274 * - decoding: Read by user.
1279 * format of the frame, -1 if unknown or unset
1280 * Values correspond to enum PixelFormat for video frames,
1281 * enum AVSampleFormat for audio)
1282 * - encoding: unused
1283 * - decoding: Read by user.
1288 struct AVCodecInternal;
1292 AV_FIELD_PROGRESSIVE,
1293 AV_FIELD_TT, //< Top coded_first, top displayed first
1294 AV_FIELD_BB, //< Bottom coded first, bottom displayed first
1295 AV_FIELD_TB, //< Top coded first, bottom displayed first
1296 AV_FIELD_BT, //< Bottom coded first, top displayed first
1300 * main external API structure.
1301 * New fields can be added to the end with minor version bumps.
1302 * Removal, reordering and changes to existing fields require a major
1304 * sizeof(AVCodecContext) must not be used outside libav*.
1306 typedef struct AVCodecContext {
1308 * information on struct for av_log
1309 * - set by avcodec_alloc_context3
1311 const AVClass *av_class;
1313 * the average bitrate
1314 * - encoding: Set by user; unused for constant quantizer encoding.
1315 * - decoding: Set by libavcodec. 0 or some bitrate if this info is available in the stream.
1320 * number of bits the bitstream is allowed to diverge from the reference.
1321 * the reference can be CBR (for CBR pass1) or VBR (for pass2)
1322 * - encoding: Set by user; unused for constant quantizer encoding.
1323 * - decoding: unused
1325 int bit_rate_tolerance;
1329 * - encoding: Set by user.
1330 * - decoding: Set by user.
1335 * Some codecs need additional format info. It is stored here.
1336 * If any muxer uses this then ALL demuxers/parsers AND encoders for the
1337 * specific codec MUST set it correctly otherwise stream copy breaks.
1338 * In general use of this field by muxers is not recommended.
1339 * - encoding: Set by libavcodec.
1340 * - decoding: Set by libavcodec. (FIXME: Is this OK?)
1345 * Motion estimation algorithm used for video coding.
1346 * 1 (zero), 2 (full), 3 (log), 4 (phods), 5 (epzs), 6 (x1), 7 (hex),
1347 * 8 (umh), 9 (iter), 10 (tesa) [7, 8, 10 are x264 specific, 9 is snow specific]
1348 * - encoding: MUST be set by user.
1349 * - decoding: unused
1354 * some codecs need / can use extradata like Huffman tables.
1355 * mjpeg: Huffman tables
1356 * rv10: additional flags
1357 * mpeg4: global headers (they can be in the bitstream or here)
1358 * The allocated memory should be FF_INPUT_BUFFER_PADDING_SIZE bytes larger
1359 * than extradata_size to avoid prolems if it is read with the bitstream reader.
1360 * The bytewise contents of extradata must not depend on the architecture or CPU endianness.
1361 * - encoding: Set/allocated/freed by libavcodec.
1362 * - decoding: Set/allocated/freed by user.
1368 * This is the fundamental unit of time (in seconds) in terms
1369 * of which frame timestamps are represented. For fixed-fps content,
1370 * timebase should be 1/framerate and timestamp increments should be
1372 * - encoding: MUST be set by user.
1373 * - decoding: Set by libavcodec.
1375 AVRational time_base;
1379 * picture width / height.
1380 * - encoding: MUST be set by user.
1381 * - decoding: Set by libavcodec.
1382 * Note: For compatibility it is possible to set this instead of
1383 * coded_width/height before decoding.
1387 #define FF_ASPECT_EXTENDED 15
1390 * the number of pictures in a group of pictures, or 0 for intra_only
1391 * - encoding: Set by user.
1392 * - decoding: unused
1397 * Pixel format, see PIX_FMT_xxx.
1398 * May be set by the demuxer if known from headers.
1399 * May be overriden by the decoder if it knows better.
1400 * - encoding: Set by user.
1401 * - decoding: Set by user if known, overridden by libavcodec if known
1403 enum PixelFormat pix_fmt;
1406 * If non NULL, 'draw_horiz_band' is called by the libavcodec
1407 * decoder to draw a horizontal band. It improves cache usage. Not
1408 * all codecs can do that. You must check the codec capabilities
1410 * When multithreading is used, it may be called from multiple threads
1411 * at the same time; threads might draw different parts of the same AVFrame,
1412 * or multiple AVFrames, and there is no guarantee that slices will be drawn
1414 * The function is also used by hardware acceleration APIs.
1415 * It is called at least once during frame decoding to pass
1416 * the data needed for hardware render.
1417 * In that mode instead of pixel data, AVFrame points to
1418 * a structure specific to the acceleration API. The application
1419 * reads the structure and can change some fields to indicate progress
1421 * - encoding: unused
1422 * - decoding: Set by user.
1423 * @param height the height of the slice
1424 * @param y the y position of the slice
1425 * @param type 1->top field, 2->bottom field, 3->frame
1426 * @param offset offset into the AVFrame.data from which the slice should be read
1428 void (*draw_horiz_band)(struct AVCodecContext *s,
1429 const AVFrame *src, int offset[AV_NUM_DATA_POINTERS],
1430 int y, int type, int height);
1433 int sample_rate; ///< samples per second
1434 int channels; ///< number of audio channels
1437 * audio sample format
1438 * - encoding: Set by user.
1439 * - decoding: Set by libavcodec.
1441 enum AVSampleFormat sample_fmt; ///< sample format
1443 /* The following data should not be initialized. */
1445 * Samples per packet, initialized when calling 'init'.
1448 int frame_number; ///< audio or video frame number
1451 * Number of frames the decoded output will be delayed relative to
1452 * the encoded input.
1453 * - encoding: Set by libavcodec.
1454 * - decoding: unused
1458 /* - encoding parameters */
1459 float qcompress; ///< amount of qscale change between easy & hard scenes (0.0-1.0)
1460 float qblur; ///< amount of qscale smoothing over time (0.0-1.0)
1464 * - encoding: Set by user.
1465 * - decoding: unused
1471 * - encoding: Set by user.
1472 * - decoding: unused
1477 * maximum quantizer difference between frames
1478 * - encoding: Set by user.
1479 * - decoding: unused
1484 * maximum number of B-frames between non-B-frames
1485 * Note: The output will be delayed by max_b_frames+1 relative to the input.
1486 * - encoding: Set by user.
1487 * - decoding: unused
1492 * qscale factor between IP and B-frames
1493 * If > 0 then the last P-frame quantizer will be used (q= lastp_q*factor+offset).
1494 * If < 0 then normal ratecontrol will be done (q= -normal_q*factor+offset).
1495 * - encoding: Set by user.
1496 * - decoding: unused
1498 float b_quant_factor;
1500 /** obsolete FIXME remove */
1502 #define FF_RC_STRATEGY_XVID 1
1504 int b_frame_strategy;
1506 struct AVCodec *codec;
1510 int rtp_payload_size; /* The size of the RTP payload: the coder will */
1511 /* do its best to deliver a chunk with size */
1512 /* below rtp_payload_size, the chunk will start */
1513 /* with a start code on some codecs like H.263. */
1514 /* This doesn't take account of any particular */
1515 /* headers inside the transmitted RTP payload. */
1518 /* The RTP callback: This function is called */
1519 /* every time the encoder has a packet to send. */
1520 /* It depends on the encoder if the data starts */
1521 /* with a Start Code (it should). H.263 does. */
1522 /* mb_nb contains the number of macroblocks */
1523 /* encoded in the RTP payload. */
1524 void (*rtp_callback)(struct AVCodecContext *avctx, void *data, int size, int mb_nb);
1526 /* statistics, used for 2-pass encoding */
1537 * number of bits used for the previously encoded frame
1538 * - encoding: Set by libavcodec.
1539 * - decoding: unused
1544 * Private data of the user, can be used to carry app specific stuff.
1545 * - encoding: Set by user.
1546 * - decoding: Set by user.
1550 char codec_name[32];
1551 enum AVMediaType codec_type; /* see AVMEDIA_TYPE_xxx */
1552 enum CodecID codec_id; /* see CODEC_ID_xxx */
1555 * fourcc (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A').
1556 * This is used to work around some encoder bugs.
1557 * A demuxer should set this to what is stored in the field used to identify the codec.
1558 * If there are multiple such fields in a container then the demuxer should choose the one
1559 * which maximizes the information about the used codec.
1560 * If the codec tag field in a container is larger than 32 bits then the demuxer should
1561 * remap the longer ID to 32 bits with a table or other structure. Alternatively a new
1562 * extra_codec_tag + size could be added but for this a clear advantage must be demonstrated
1564 * - encoding: Set by user, if not then the default based on codec_id will be used.
1565 * - decoding: Set by user, will be converted to uppercase by libavcodec during init.
1567 unsigned int codec_tag;
1570 * Work around bugs in encoders which sometimes cannot be detected automatically.
1571 * - encoding: Set by user
1572 * - decoding: Set by user
1574 int workaround_bugs;
1575 #define FF_BUG_AUTODETECT 1 ///< autodetection
1576 #define FF_BUG_OLD_MSMPEG4 2
1577 #define FF_BUG_XVID_ILACE 4
1578 #define FF_BUG_UMP4 8
1579 #define FF_BUG_NO_PADDING 16
1580 #define FF_BUG_AMV 32
1581 #define FF_BUG_AC_VLC 0 ///< Will be removed, libavcodec can now handle these non-compliant files by default.
1582 #define FF_BUG_QPEL_CHROMA 64
1583 #define FF_BUG_STD_QPEL 128
1584 #define FF_BUG_QPEL_CHROMA2 256
1585 #define FF_BUG_DIRECT_BLOCKSIZE 512
1586 #define FF_BUG_EDGE 1024
1587 #define FF_BUG_HPEL_CHROMA 2048
1588 #define FF_BUG_DC_CLIP 4096
1589 #define FF_BUG_MS 8192 ///< Work around various bugs in Microsoft's broken decoders.
1590 #define FF_BUG_TRUNCATED 16384
1591 //#define FF_BUG_FAKE_SCALABILITY 16 //Autodetection should work 100%.
1594 * luma single coefficient elimination threshold
1595 * - encoding: Set by user.
1596 * - decoding: unused
1598 int luma_elim_threshold;
1601 * chroma single coeff elimination threshold
1602 * - encoding: Set by user.
1603 * - decoding: unused
1605 int chroma_elim_threshold;
1608 * strictly follow the standard (MPEG4, ...).
1609 * - encoding: Set by user.
1610 * - decoding: Set by user.
1611 * Setting this to STRICT or higher means the encoder and decoder will
1612 * generally do stupid things, whereas setting it to unofficial or lower
1613 * will mean the encoder might produce output that is not supported by all
1614 * spec-compliant decoders. Decoders don't differentiate between normal,
1615 * unofficial and experimental (that is, they always try to decode things
1616 * when they can) unless they are explicitly asked to behave stupidly
1617 * (=strictly conform to the specs)
1619 int strict_std_compliance;
1620 #define FF_COMPLIANCE_VERY_STRICT 2 ///< Strictly conform to an older more strict version of the spec or reference software.
1621 #define FF_COMPLIANCE_STRICT 1 ///< Strictly conform to all the things in the spec no matter what consequences.
1622 #define FF_COMPLIANCE_NORMAL 0
1623 #define FF_COMPLIANCE_UNOFFICIAL -1 ///< Allow unofficial extensions
1624 #define FF_COMPLIANCE_EXPERIMENTAL -2 ///< Allow nonstandardized experimental things.
1627 * qscale offset between IP and B-frames
1628 * - encoding: Set by user.
1629 * - decoding: unused
1631 float b_quant_offset;
1635 * Error recognition; higher values will detect more errors but may
1636 * misdetect some more or less valid parts as errors.
1637 * - encoding: unused
1638 * - decoding: Set by user.
1640 attribute_deprecated int error_recognition;
1641 #define FF_ER_CAREFUL 1
1642 #define FF_ER_COMPLIANT 2
1643 #define FF_ER_AGGRESSIVE 3
1644 #define FF_ER_VERY_AGGRESSIVE 4
1645 #define FF_ER_EXPLODE 5
1646 #endif /* FF_API_ER */
1649 * Called at the beginning of each frame to get a buffer for it.
1651 * The function will set AVFrame.data[], AVFrame.linesize[].
1652 * AVFrame.extended_data[] must also be set, but it should be the same as
1653 * AVFrame.data[] except for planar audio with more channels than can fit
1654 * in AVFrame.data[]. In that case, AVFrame.data[] shall still contain as
1655 * many data pointers as it can hold.
1657 * if CODEC_CAP_DR1 is not set then get_buffer() must call
1658 * avcodec_default_get_buffer() instead of providing buffers allocated by
1661 * AVFrame.data[] should be 32- or 16-byte-aligned unless the CPU doesn't
1662 * need it. avcodec_default_get_buffer() aligns the output buffer properly,
1663 * but if get_buffer() is overridden then alignment considerations should
1664 * be taken into account.
1666 * @see avcodec_default_get_buffer()
1670 * If pic.reference is set then the frame will be read later by libavcodec.
1671 * avcodec_align_dimensions2() should be used to find the required width and
1672 * height, as they normally need to be rounded up to the next multiple of 16.
1674 * If frame multithreading is used and thread_safe_callbacks is set,
1675 * it may be called from a different thread, but not from more than one at
1676 * once. Does not need to be reentrant.
1678 * @see release_buffer(), reget_buffer()
1679 * @see avcodec_align_dimensions2()
1683 * Decoders request a buffer of a particular size by setting
1684 * AVFrame.nb_samples prior to calling get_buffer(). The decoder may,
1685 * however, utilize only part of the buffer by setting AVFrame.nb_samples
1686 * to a smaller value in the output frame.
1688 * Decoders cannot use the buffer after returning from
1689 * avcodec_decode_audio4(), so they will not call release_buffer(), as it
1690 * is assumed to be released immediately upon return.
1692 * As a convenience, av_samples_get_buffer_size() and
1693 * av_samples_fill_arrays() in libavutil may be used by custom get_buffer()
1694 * functions to find the required data size and to fill data pointers and
1695 * linesize. In AVFrame.linesize, only linesize[0] may be set for audio
1696 * since all planes must be the same size.
1698 * @see av_samples_get_buffer_size(), av_samples_fill_arrays()
1700 * - encoding: unused
1701 * - decoding: Set by libavcodec, user can override.
1703 int (*get_buffer)(struct AVCodecContext *c, AVFrame *pic);
1706 * Called to release buffers which were allocated with get_buffer.
1707 * A released buffer can be reused in get_buffer().
1708 * pic.data[*] must be set to NULL.
1709 * May be called from a different thread if frame multithreading is used,
1710 * but not by more than one thread at once, so does not need to be reentrant.
1711 * - encoding: unused
1712 * - decoding: Set by libavcodec, user can override.
1714 void (*release_buffer)(struct AVCodecContext *c, AVFrame *pic);
1717 * Size of the frame reordering buffer in the decoder.
1718 * For MPEG-2 it is 1 IPB or 0 low delay IP.
1719 * - encoding: Set by libavcodec.
1720 * - decoding: Set by libavcodec.
1725 * number of bytes per packet if constant and known or 0
1726 * Used by some WAV based audio codecs.
1730 #if FF_API_PARSE_FRAME
1732 * If true, only parsing is done. The frame data is returned.
1733 * Only MPEG audio decoders support this now.
1734 * - encoding: unused
1735 * - decoding: Set by user
1737 attribute_deprecated int parse_only;
1741 * 0-> h263 quant 1-> mpeg quant
1742 * - encoding: Set by user.
1743 * - decoding: unused
1748 * pass1 encoding statistics output buffer
1749 * - encoding: Set by libavcodec.
1750 * - decoding: unused
1755 * pass2 encoding statistics input buffer
1756 * Concatenated stuff from stats_out of pass1 should be placed here.
1757 * - encoding: Allocated/set/freed by user.
1758 * - decoding: unused
1763 * ratecontrol qmin qmax limiting method
1764 * 0-> clipping, 1-> use a nice continous function to limit qscale wthin qmin/qmax.
1765 * - encoding: Set by user.
1766 * - decoding: unused
1774 * ratecontrol override, see RcOverride
1775 * - encoding: Allocated/set/freed by user.
1776 * - decoding: unused
1778 RcOverride *rc_override;
1779 int rc_override_count;
1782 * rate control equation
1783 * - encoding: Set by user
1784 * - decoding: unused
1790 * - encoding: Set by user.
1791 * - decoding: unused
1797 * - encoding: Set by user.
1798 * - decoding: unused
1803 * decoder bitstream buffer size
1804 * - encoding: Set by user.
1805 * - decoding: unused
1808 float rc_buffer_aggressivity;
1811 * qscale factor between P and I-frames
1812 * If > 0 then the last p frame quantizer will be used (q= lastp_q*factor+offset).
1813 * If < 0 then normal ratecontrol will be done (q= -normal_q*factor+offset).
1814 * - encoding: Set by user.
1815 * - decoding: unused
1817 float i_quant_factor;
1820 * qscale offset between P and I-frames
1821 * - encoding: Set by user.
1822 * - decoding: unused
1824 float i_quant_offset;
1827 * initial complexity for pass1 ratecontrol
1828 * - encoding: Set by user.
1829 * - decoding: unused
1831 float rc_initial_cplx;
1834 * DCT algorithm, see FF_DCT_* below
1835 * - encoding: Set by user.
1836 * - decoding: unused
1839 #define FF_DCT_AUTO 0
1840 #define FF_DCT_FASTINT 1
1841 #define FF_DCT_INT 2
1842 #define FF_DCT_MMX 3
1843 #define FF_DCT_MLIB 4
1844 #define FF_DCT_ALTIVEC 5
1845 #define FF_DCT_FAAN 6
1848 * luminance masking (0-> disabled)
1849 * - encoding: Set by user.
1850 * - decoding: unused
1855 * temporary complexity masking (0-> disabled)
1856 * - encoding: Set by user.
1857 * - decoding: unused
1859 float temporal_cplx_masking;
1862 * spatial complexity masking (0-> disabled)
1863 * - encoding: Set by user.
1864 * - decoding: unused
1866 float spatial_cplx_masking;
1869 * p block masking (0-> disabled)
1870 * - encoding: Set by user.
1871 * - decoding: unused
1876 * darkness masking (0-> disabled)
1877 * - encoding: Set by user.
1878 * - decoding: unused
1883 * IDCT algorithm, see FF_IDCT_* below.
1884 * - encoding: Set by user.
1885 * - decoding: Set by user.
1888 #define FF_IDCT_AUTO 0
1889 #define FF_IDCT_INT 1
1890 #define FF_IDCT_SIMPLE 2
1891 #define FF_IDCT_SIMPLEMMX 3
1892 #define FF_IDCT_LIBMPEG2MMX 4
1893 #define FF_IDCT_PS2 5
1894 #define FF_IDCT_MLIB 6
1895 #define FF_IDCT_ARM 7
1896 #define FF_IDCT_ALTIVEC 8
1897 #define FF_IDCT_SH4 9
1898 #define FF_IDCT_SIMPLEARM 10
1899 #define FF_IDCT_H264 11
1900 #define FF_IDCT_VP3 12
1901 #define FF_IDCT_IPP 13
1902 #define FF_IDCT_XVIDMMX 14
1903 #define FF_IDCT_CAVS 15
1904 #define FF_IDCT_SIMPLEARMV5TE 16
1905 #define FF_IDCT_SIMPLEARMV6 17
1906 #define FF_IDCT_SIMPLEVIS 18
1907 #define FF_IDCT_WMV2 19
1908 #define FF_IDCT_FAAN 20
1909 #define FF_IDCT_EA 21
1910 #define FF_IDCT_SIMPLENEON 22
1911 #define FF_IDCT_SIMPLEALPHA 23
1912 #define FF_IDCT_BINK 24
1916 * - encoding: Set by libavcodec.
1917 * - decoding: Set by user (or 0).
1921 * slice offsets in the frame in bytes
1922 * - encoding: Set/allocated by libavcodec.
1923 * - decoding: Set/allocated by user (or NULL).
1928 * error concealment flags
1929 * - encoding: unused
1930 * - decoding: Set by user.
1932 int error_concealment;
1933 #define FF_EC_GUESS_MVS 1
1934 #define FF_EC_DEBLOCK 2
1937 * dsp_mask could be add used to disable unwanted CPU features
1938 * CPU features (i.e. MMX, SSE. ...)
1940 * With the FORCE flag you may instead enable given CPU features.
1941 * (Dangerous: Usable in case of misdetection, improper usage however will
1942 * result into program crash.)
1947 * bits per sample/pixel from the demuxer (needed for huffyuv).
1948 * - encoding: Set by libavcodec.
1949 * - decoding: Set by user.
1951 int bits_per_coded_sample;
1954 * prediction method (needed for huffyuv)
1955 * - encoding: Set by user.
1956 * - decoding: unused
1958 int prediction_method;
1959 #define FF_PRED_LEFT 0
1960 #define FF_PRED_PLANE 1
1961 #define FF_PRED_MEDIAN 2
1964 * sample aspect ratio (0 if unknown)
1965 * That is the width of a pixel divided by the height of the pixel.
1966 * Numerator and denominator must be relatively prime and smaller than 256 for some video standards.
1967 * - encoding: Set by user.
1968 * - decoding: Set by libavcodec.
1970 AVRational sample_aspect_ratio;
1973 * the picture in the bitstream
1974 * - encoding: Set by libavcodec.
1975 * - decoding: Set by libavcodec.
1977 AVFrame *coded_frame;
1981 * - encoding: Set by user.
1982 * - decoding: Set by user.
1985 #define FF_DEBUG_PICT_INFO 1
1986 #define FF_DEBUG_RC 2
1987 #define FF_DEBUG_BITSTREAM 4
1988 #define FF_DEBUG_MB_TYPE 8
1989 #define FF_DEBUG_QP 16
1990 #define FF_DEBUG_MV 32
1991 #define FF_DEBUG_DCT_COEFF 0x00000040
1992 #define FF_DEBUG_SKIP 0x00000080
1993 #define FF_DEBUG_STARTCODE 0x00000100
1994 #define FF_DEBUG_PTS 0x00000200
1995 #define FF_DEBUG_ER 0x00000400
1996 #define FF_DEBUG_MMCO 0x00000800
1997 #define FF_DEBUG_BUGS 0x00001000
1998 #define FF_DEBUG_VIS_QP 0x00002000
1999 #define FF_DEBUG_VIS_MB_TYPE 0x00004000
2000 #define FF_DEBUG_BUFFERS 0x00008000
2001 #define FF_DEBUG_THREADS 0x00010000
2005 * - encoding: Set by user.
2006 * - decoding: Set by user.
2009 #define FF_DEBUG_VIS_MV_P_FOR 0x00000001 //visualize forward predicted MVs of P frames
2010 #define FF_DEBUG_VIS_MV_B_FOR 0x00000002 //visualize forward predicted MVs of B frames
2011 #define FF_DEBUG_VIS_MV_B_BACK 0x00000004 //visualize backward predicted MVs of B frames
2015 * - encoding: Set by libavcodec if flags&CODEC_FLAG_PSNR.
2016 * - decoding: unused
2018 uint64_t error[AV_NUM_DATA_POINTERS];
2021 * motion estimation comparison function
2022 * - encoding: Set by user.
2023 * - decoding: unused
2027 * subpixel motion estimation comparison function
2028 * - encoding: Set by user.
2029 * - decoding: unused
2033 * macroblock comparison function (not supported yet)
2034 * - encoding: Set by user.
2035 * - decoding: unused
2039 * interlaced DCT comparison function
2040 * - encoding: Set by user.
2041 * - decoding: unused
2044 #define FF_CMP_SAD 0
2045 #define FF_CMP_SSE 1
2046 #define FF_CMP_SATD 2
2047 #define FF_CMP_DCT 3
2048 #define FF_CMP_PSNR 4
2049 #define FF_CMP_BIT 5
2051 #define FF_CMP_ZERO 7
2052 #define FF_CMP_VSAD 8
2053 #define FF_CMP_VSSE 9
2054 #define FF_CMP_NSSE 10
2055 #define FF_CMP_W53 11
2056 #define FF_CMP_W97 12
2057 #define FF_CMP_DCTMAX 13
2058 #define FF_CMP_DCT264 14
2059 #define FF_CMP_CHROMA 256
2062 * ME diamond size & shape
2063 * - encoding: Set by user.
2064 * - decoding: unused
2069 * amount of previous MV predictors (2a+1 x 2a+1 square)
2070 * - encoding: Set by user.
2071 * - decoding: unused
2073 int last_predictor_count;
2076 * prepass for motion estimation
2077 * - encoding: Set by user.
2078 * - decoding: unused
2083 * motion estimation prepass comparison function
2084 * - encoding: Set by user.
2085 * - decoding: unused
2090 * ME prepass diamond size & shape
2091 * - encoding: Set by user.
2092 * - decoding: unused
2098 * - encoding: Set by user.
2099 * - decoding: unused
2101 int me_subpel_quality;
2104 * callback to negotiate the pixelFormat
2105 * @param fmt is the list of formats which are supported by the codec,
2106 * it is terminated by -1 as 0 is a valid format, the formats are ordered by quality.
2107 * The first is always the native one.
2108 * @return the chosen format
2109 * - encoding: unused
2110 * - decoding: Set by user, if not set the native format will be chosen.
2112 enum PixelFormat (*get_format)(struct AVCodecContext *s, const enum PixelFormat * fmt);
2115 * DTG active format information (additional aspect ratio
2116 * information only used in DVB MPEG-2 transport streams)
2119 * - encoding: unused
2120 * - decoding: Set by decoder.
2122 int dtg_active_format;
2123 #define FF_DTG_AFD_SAME 8
2124 #define FF_DTG_AFD_4_3 9
2125 #define FF_DTG_AFD_16_9 10
2126 #define FF_DTG_AFD_14_9 11
2127 #define FF_DTG_AFD_4_3_SP_14_9 13
2128 #define FF_DTG_AFD_16_9_SP_14_9 14
2129 #define FF_DTG_AFD_SP_4_3 15
2132 * maximum motion estimation search range in subpel units
2133 * If 0 then no limit.
2135 * - encoding: Set by user.
2136 * - decoding: unused
2141 * intra quantizer bias
2142 * - encoding: Set by user.
2143 * - decoding: unused
2145 int intra_quant_bias;
2146 #define FF_DEFAULT_QUANT_BIAS 999999
2149 * inter quantizer bias
2150 * - encoding: Set by user.
2151 * - decoding: unused
2153 int inter_quant_bias;
2157 * - encoding: unused
2158 * - decoding: Which clrtable should be used for 8bit RGB images.
2159 * Tables have to be stored somewhere. FIXME
2163 #if FF_API_INTERNAL_CONTEXT
2165 * internal_buffer count
2166 * Don't touch, used by libavcodec default_get_buffer().
2167 * @deprecated this field was moved to an internal context
2169 attribute_deprecated int internal_buffer_count;
2173 * Don't touch, used by libavcodec default_get_buffer().
2174 * @deprecated this field was moved to an internal context
2176 attribute_deprecated void *internal_buffer;
2180 * Global quality for codecs which cannot change it per frame.
2181 * This should be proportional to MPEG-1/2/4 qscale.
2182 * - encoding: Set by user.
2183 * - decoding: unused
2187 #define FF_CODER_TYPE_VLC 0
2188 #define FF_CODER_TYPE_AC 1
2189 #define FF_CODER_TYPE_RAW 2
2190 #define FF_CODER_TYPE_RLE 3
2191 #define FF_CODER_TYPE_DEFLATE 4
2194 * - encoding: Set by user.
2195 * - decoding: unused
2201 * - encoding: Set by user.
2202 * - decoding: unused
2208 * - encoding: unused
2209 * - decoding: Set by user.
2211 uint8_t * (*realloc)(struct AVCodecContext *s, uint8_t *buf, int buf_size);
2216 * - encoding: unused
2217 * - decoding: Set by user.
2220 #define SLICE_FLAG_CODED_ORDER 0x0001 ///< draw_horiz_band() is called in coded order instead of display
2221 #define SLICE_FLAG_ALLOW_FIELD 0x0002 ///< allow draw_horiz_band() with field slices (MPEG2 field pics)
2222 #define SLICE_FLAG_ALLOW_PLANE 0x0004 ///< allow draw_horiz_band() with 1 component at a time (SVQ1)
2225 * XVideo Motion Acceleration
2226 * - encoding: forbidden
2227 * - decoding: set by decoder
2229 int xvmc_acceleration;
2232 * macroblock decision mode
2233 * - encoding: Set by user.
2234 * - decoding: unused
2237 #define FF_MB_DECISION_SIMPLE 0 ///< uses mb_cmp
2238 #define FF_MB_DECISION_BITS 1 ///< chooses the one which needs the fewest bits
2239 #define FF_MB_DECISION_RD 2 ///< rate distortion
2242 * custom intra quantization matrix
2243 * - encoding: Set by user, can be NULL.
2244 * - decoding: Set by libavcodec.
2246 uint16_t *intra_matrix;
2249 * custom inter quantization matrix
2250 * - encoding: Set by user, can be NULL.
2251 * - decoding: Set by libavcodec.
2253 uint16_t *inter_matrix;
2256 * fourcc from the AVI stream header (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A').
2257 * This is used to work around some encoder bugs.
2258 * - encoding: unused
2259 * - decoding: Set by user, will be converted to uppercase by libavcodec during init.
2261 unsigned int stream_codec_tag;
2264 * scene change detection threshold
2265 * 0 is default, larger means fewer detected scene changes.
2266 * - encoding: Set by user.
2267 * - decoding: unused
2269 int scenechange_threshold;
2272 * minimum Lagrange multipler
2273 * - encoding: Set by user.
2274 * - decoding: unused
2279 * maximum Lagrange multipler
2280 * - encoding: Set by user.
2281 * - decoding: unused
2285 #if FF_API_PALETTE_CONTROL
2287 * palette control structure
2288 * - encoding: ??? (no palette-enabled encoder yet)
2289 * - decoding: Set by user.
2291 struct AVPaletteControl *palctrl;
2295 * noise reduction strength
2296 * - encoding: Set by user.
2297 * - decoding: unused
2299 int noise_reduction;
2302 * Called at the beginning of a frame to get cr buffer for it.
2303 * Buffer type (size, hints) must be the same. libavcodec won't check it.
2304 * libavcodec will pass previous buffer in pic, function should return
2305 * same buffer or new buffer with old frame "painted" into it.
2306 * If pic.data[0] == NULL must behave like get_buffer().
2307 * if CODEC_CAP_DR1 is not set then reget_buffer() must call
2308 * avcodec_default_reget_buffer() instead of providing buffers allocated by
2310 * - encoding: unused
2311 * - decoding: Set by libavcodec, user can override.
2313 int (*reget_buffer)(struct AVCodecContext *c, AVFrame *pic);
2316 * Number of bits which should be loaded into the rc buffer before decoding starts.
2317 * - encoding: Set by user.
2318 * - decoding: unused
2320 int rc_initial_buffer_occupancy;
2324 * - encoding: Set by user.
2325 * - decoding: unused
2327 int inter_threshold;
2331 * - encoding: Set by user.
2332 * - decoding: Set by user.
2337 * Simulates errors in the bitstream to test error concealment.
2338 * - encoding: Set by user.
2339 * - decoding: unused
2343 #if FF_API_ANTIALIAS_ALGO
2345 * MP3 antialias algorithm, see FF_AA_* below.
2346 * - encoding: unused
2347 * - decoding: Set by user.
2349 attribute_deprecated int antialias_algo;
2350 #define FF_AA_AUTO 0
2351 #define FF_AA_FASTINT 1 //not implemented yet
2353 #define FF_AA_FLOAT 3
2357 * quantizer noise shaping
2358 * - encoding: Set by user.
2359 * - decoding: unused
2361 int quantizer_noise_shaping;
2365 * is used to decide how many independent tasks should be passed to execute()
2366 * - encoding: Set by user.
2367 * - decoding: Set by user.
2372 * The codec may call this to execute several independent things.
2373 * It will return only after finishing all tasks.
2374 * The user may replace this with some multithreaded implementation,
2375 * the default implementation will execute the parts serially.
2376 * @param count the number of things to execute
2377 * - encoding: Set by libavcodec, user can override.
2378 * - decoding: Set by libavcodec, user can override.
2380 int (*execute)(struct AVCodecContext *c, int (*func)(struct AVCodecContext *c2, void *arg), void *arg2, int *ret, int count, int size);
2384 * Can be used by execute() to store some per AVCodecContext stuff.
2385 * - encoding: set by execute()
2386 * - decoding: set by execute()
2388 void *thread_opaque;
2391 * Motion estimation threshold below which no motion estimation is
2392 * performed, but instead the user specified motion vectors are used.
2394 * - encoding: Set by user.
2395 * - decoding: unused
2400 * Macroblock threshold below which the user specified macroblock types will be used.
2401 * - encoding: Set by user.
2402 * - decoding: unused
2407 * precision of the intra DC coefficient - 8
2408 * - encoding: Set by user.
2409 * - decoding: unused
2411 int intra_dc_precision;
2414 * noise vs. sse weight for the nsse comparsion function
2415 * - encoding: Set by user.
2416 * - decoding: unused
2421 * Number of macroblock rows at the top which are skipped.
2422 * - encoding: unused
2423 * - decoding: Set by user.
2428 * Number of macroblock rows at the bottom which are skipped.
2429 * - encoding: unused
2430 * - decoding: Set by user.
2436 * - encoding: Set by user.
2437 * - decoding: Set by libavcodec.
2440 #define FF_PROFILE_UNKNOWN -99
2441 #define FF_PROFILE_RESERVED -100
2443 #define FF_PROFILE_AAC_MAIN 0
2444 #define FF_PROFILE_AAC_LOW 1
2445 #define FF_PROFILE_AAC_SSR 2
2446 #define FF_PROFILE_AAC_LTP 3
2448 #define FF_PROFILE_DTS 20
2449 #define FF_PROFILE_DTS_ES 30
2450 #define FF_PROFILE_DTS_96_24 40
2451 #define FF_PROFILE_DTS_HD_HRA 50
2452 #define FF_PROFILE_DTS_HD_MA 60
2454 #define FF_PROFILE_MPEG2_422 0
2455 #define FF_PROFILE_MPEG2_HIGH 1
2456 #define FF_PROFILE_MPEG2_SS 2
2457 #define FF_PROFILE_MPEG2_SNR_SCALABLE 3
2458 #define FF_PROFILE_MPEG2_MAIN 4
2459 #define FF_PROFILE_MPEG2_SIMPLE 5
2461 #define FF_PROFILE_H264_CONSTRAINED (1<<9) // 8+1; constraint_set1_flag
2462 #define FF_PROFILE_H264_INTRA (1<<11) // 8+3; constraint_set3_flag
2464 #define FF_PROFILE_H264_BASELINE 66
2465 #define FF_PROFILE_H264_CONSTRAINED_BASELINE (66|FF_PROFILE_H264_CONSTRAINED)
2466 #define FF_PROFILE_H264_MAIN 77
2467 #define FF_PROFILE_H264_EXTENDED 88
2468 #define FF_PROFILE_H264_HIGH 100
2469 #define FF_PROFILE_H264_HIGH_10 110
2470 #define FF_PROFILE_H264_HIGH_10_INTRA (110|FF_PROFILE_H264_INTRA)
2471 #define FF_PROFILE_H264_HIGH_422 122
2472 #define FF_PROFILE_H264_HIGH_422_INTRA (122|FF_PROFILE_H264_INTRA)
2473 #define FF_PROFILE_H264_HIGH_444 144
2474 #define FF_PROFILE_H264_HIGH_444_PREDICTIVE 244
2475 #define FF_PROFILE_H264_HIGH_444_INTRA (244|FF_PROFILE_H264_INTRA)
2476 #define FF_PROFILE_H264_CAVLC_444 44
2478 #define FF_PROFILE_VC1_SIMPLE 0
2479 #define FF_PROFILE_VC1_MAIN 1
2480 #define FF_PROFILE_VC1_COMPLEX 2
2481 #define FF_PROFILE_VC1_ADVANCED 3
2483 #define FF_PROFILE_MPEG4_SIMPLE 0
2484 #define FF_PROFILE_MPEG4_SIMPLE_SCALABLE 1
2485 #define FF_PROFILE_MPEG4_CORE 2
2486 #define FF_PROFILE_MPEG4_MAIN 3
2487 #define FF_PROFILE_MPEG4_N_BIT 4
2488 #define FF_PROFILE_MPEG4_SCALABLE_TEXTURE 5
2489 #define FF_PROFILE_MPEG4_SIMPLE_FACE_ANIMATION 6
2490 #define FF_PROFILE_MPEG4_BASIC_ANIMATED_TEXTURE 7
2491 #define FF_PROFILE_MPEG4_HYBRID 8
2492 #define FF_PROFILE_MPEG4_ADVANCED_REAL_TIME 9
2493 #define FF_PROFILE_MPEG4_CORE_SCALABLE 10
2494 #define FF_PROFILE_MPEG4_ADVANCED_CODING 11
2495 #define FF_PROFILE_MPEG4_ADVANCED_CORE 12
2496 #define FF_PROFILE_MPEG4_ADVANCED_SCALABLE_TEXTURE 13
2497 #define FF_PROFILE_MPEG4_SIMPLE_STUDIO 14
2498 #define FF_PROFILE_MPEG4_ADVANCED_SIMPLE 15
2502 * - encoding: Set by user.
2503 * - decoding: Set by libavcodec.
2506 #define FF_LEVEL_UNKNOWN -99
2509 * low resolution decoding, 1-> 1/2 size, 2->1/4 size
2510 * - encoding: unused
2511 * - decoding: Set by user.
2516 * Bitstream width / height, may be different from width/height if lowres enabled.
2517 * - encoding: unused
2518 * - decoding: Set by user before init if known. Codec should override / dynamically change if needed.
2520 int coded_width, coded_height;
2523 * frame skip threshold
2524 * - encoding: Set by user.
2525 * - decoding: unused
2527 int frame_skip_threshold;
2531 * - encoding: Set by user.
2532 * - decoding: unused
2534 int frame_skip_factor;
2537 * frame skip exponent
2538 * - encoding: Set by user.
2539 * - decoding: unused
2544 * frame skip comparison function
2545 * - encoding: Set by user.
2546 * - decoding: unused
2551 * Border processing masking, raises the quantizer for mbs on the borders
2553 * - encoding: Set by user.
2554 * - decoding: unused
2556 float border_masking;
2559 * minimum MB lagrange multipler
2560 * - encoding: Set by user.
2561 * - decoding: unused
2566 * maximum MB lagrange multipler
2567 * - encoding: Set by user.
2568 * - decoding: unused
2574 * - encoding: Set by user.
2575 * - decoding: unused
2577 int me_penalty_compensation;
2581 * - encoding: unused
2582 * - decoding: Set by user.
2584 enum AVDiscard skip_loop_filter;
2588 * - encoding: unused
2589 * - decoding: Set by user.
2591 enum AVDiscard skip_idct;
2595 * - encoding: unused
2596 * - decoding: Set by user.
2598 enum AVDiscard skip_frame;
2602 * - encoding: Set by user.
2603 * - decoding: unused
2609 * - encoding: Set by user.
2610 * - decoding: unused
2616 * - encoding: Set by user.
2617 * - decoding: unused
2622 * number of reference frames
2623 * - encoding: Set by user.
2624 * - decoding: Set by lavc.
2629 * chroma qp offset from luma
2630 * - encoding: Set by user.
2631 * - decoding: unused
2636 * trellis RD quantization
2637 * - encoding: Set by user.
2638 * - decoding: unused
2643 * Audio cutoff bandwidth (0 means "automatic")
2644 * - encoding: Set by user.
2645 * - decoding: unused
2650 * Multiplied by qscale for each frame and added to scene_change_score.
2651 * - encoding: Set by user.
2652 * - decoding: unused
2654 int scenechange_factor;
2658 * Note: Value depends upon the compare function used for fullpel ME.
2659 * - encoding: Set by user.
2660 * - decoding: unused
2665 * Adjust sensitivity of b_frame_strategy 1.
2666 * - encoding: Set by user.
2667 * - decoding: unused
2672 * - encoding: Set by user.
2673 * - decoding: unused
2675 int compression_level;
2676 #define FF_COMPRESSION_DEFAULT -1
2679 * - encoding: Set by user.
2680 * - decoding: unused
2682 int min_prediction_order;
2685 * - encoding: Set by user.
2686 * - decoding: unused
2688 int max_prediction_order;
2690 #if FF_API_FLAC_GLOBAL_OPTS
2692 * @name FLAC options
2693 * @deprecated Use FLAC encoder private options instead.
2698 * LPC coefficient precision - used by FLAC encoder
2699 * - encoding: Set by user.
2700 * - decoding: unused
2702 attribute_deprecated int lpc_coeff_precision;
2705 * search method for selecting prediction order
2706 * - encoding: Set by user.
2707 * - decoding: unused
2709 attribute_deprecated int prediction_order_method;
2712 * - encoding: Set by user.
2713 * - decoding: unused
2715 attribute_deprecated int min_partition_order;
2718 * - encoding: Set by user.
2719 * - decoding: unused
2721 attribute_deprecated int max_partition_order;
2728 * GOP timecode frame start number, in non drop frame format
2729 * - encoding: Set by user.
2730 * - decoding: unused
2732 int64_t timecode_frame_start;
2734 #if FF_API_REQUEST_CHANNELS
2736 * Decoder should decode to this many channels if it can (0 for default)
2737 * - encoding: unused
2738 * - decoding: Set by user.
2739 * @deprecated Deprecated in favor of request_channel_layout.
2741 int request_channels;
2744 #if FF_API_DRC_SCALE
2746 * Percentage of dynamic range compression to be applied by the decoder.
2747 * The default value is 1.0, corresponding to full compression.
2748 * - encoding: unused
2749 * - decoding: Set by user.
2750 * @deprecated use AC3 decoder private option instead.
2752 attribute_deprecated float drc_scale;
2756 * opaque 64bit number (generally a PTS) that will be reordered and
2757 * output in AVFrame.reordered_opaque
2758 * @deprecated in favor of pkt_pts
2759 * - encoding: unused
2760 * - decoding: Set by user.
2762 int64_t reordered_opaque;
2765 * Bits per sample/pixel of internal libavcodec pixel/sample format.
2766 * - encoding: set by user.
2767 * - decoding: set by libavcodec.
2769 int bits_per_raw_sample;
2772 * Audio channel layout.
2773 * - encoding: set by user.
2774 * - decoding: set by libavcodec.
2776 uint64_t channel_layout;
2779 * Request decoder to use this channel layout if it can (0 for default)
2780 * - encoding: unused
2781 * - decoding: Set by user.
2783 uint64_t request_channel_layout;
2786 * Ratecontrol attempt to use, at maximum, <value> of what can be used without an underflow.
2787 * - encoding: Set by user.
2788 * - decoding: unused.
2790 float rc_max_available_vbv_use;
2793 * Ratecontrol attempt to use, at least, <value> times the amount needed to prevent a vbv overflow.
2794 * - encoding: Set by user.
2795 * - decoding: unused.
2797 float rc_min_vbv_overflow_use;
2800 * Hardware accelerator in use
2801 * - encoding: unused.
2802 * - decoding: Set by libavcodec
2804 struct AVHWAccel *hwaccel;
2807 * For some codecs, the time base is closer to the field rate than the frame rate.
2808 * Most notably, H.264 and MPEG-2 specify time_base as half of frame duration
2809 * if no telecine is used ...
2811 * Set to time_base ticks per frame. Default 1, e.g., H.264/MPEG-2 set it to 2.
2813 int ticks_per_frame;
2816 * Hardware accelerator context.
2817 * For some hardware accelerators, a global context needs to be
2818 * provided by the user. In that case, this holds display-dependent
2819 * data Libav cannot instantiate itself. Please refer to the
2820 * Libav HW accelerator documentation to know how to fill this
2821 * is. e.g. for VA API, this is a struct vaapi_context.
2822 * - encoding: unused
2823 * - decoding: Set by user
2825 void *hwaccel_context;
2828 * Chromaticity coordinates of the source primaries.
2829 * - encoding: Set by user
2830 * - decoding: Set by libavcodec
2832 enum AVColorPrimaries color_primaries;
2835 * Color Transfer Characteristic.
2836 * - encoding: Set by user
2837 * - decoding: Set by libavcodec
2839 enum AVColorTransferCharacteristic color_trc;
2842 * YUV colorspace type.
2843 * - encoding: Set by user
2844 * - decoding: Set by libavcodec
2846 enum AVColorSpace colorspace;
2849 * MPEG vs JPEG YUV range.
2850 * - encoding: Set by user
2851 * - decoding: Set by libavcodec
2853 enum AVColorRange color_range;
2856 * This defines the location of chroma samples.
2857 * - encoding: Set by user
2858 * - decoding: Set by libavcodec
2860 enum AVChromaLocation chroma_sample_location;
2863 * The codec may call this to execute several independent things.
2864 * It will return only after finishing all tasks.
2865 * The user may replace this with some multithreaded implementation,
2866 * the default implementation will execute the parts serially.
2867 * Also see avcodec_thread_init and e.g. the --enable-pthread configure option.
2868 * @param c context passed also to func
2869 * @param count the number of things to execute
2870 * @param arg2 argument passed unchanged to func
2871 * @param ret return values of executed functions, must have space for "count" values. May be NULL.
2872 * @param func function that will be called count times, with jobnr from 0 to count-1.
2873 * threadnr will be in the range 0 to c->thread_count-1 < MAX_THREADS and so that no
2874 * two instances of func executing at the same time will have the same threadnr.
2875 * @return always 0 currently, but code should handle a future improvement where when any call to func
2876 * returns < 0 no further calls to func may be done and < 0 is returned.
2877 * - encoding: Set by libavcodec, user can override.
2878 * - decoding: Set by libavcodec, user can override.
2880 int (*execute2)(struct AVCodecContext *c, int (*func)(struct AVCodecContext *c2, void *arg, int jobnr, int threadnr), void *arg2, int *ret, int count);
2882 int log_level_offset;
2884 #if FF_API_FLAC_GLOBAL_OPTS
2886 * Determine which LPC analysis algorithm to use.
2887 * - encoding: Set by user
2888 * - decoding: unused
2890 attribute_deprecated enum AVLPCType lpc_type;
2893 * Number of passes to use for Cholesky factorization during LPC analysis
2894 * - encoding: Set by user
2895 * - decoding: unused
2897 attribute_deprecated int lpc_passes;
2902 * Indicates number of picture subdivisions. Used for parallelized
2904 * - encoding: Set by user
2905 * - decoding: unused
2910 * Header containing style information for text subtitles.
2911 * For SUBTITLE_ASS subtitle type, it should contain the whole ASS
2912 * [Script Info] and [V4+ Styles] section, plus the [Events] line and
2913 * the Format line following. It shouldn't include any Dialogue line.
2914 * - encoding: Set/allocated/freed by user (before avcodec_open2())
2915 * - decoding: Set/allocated/freed by libavcodec (by avcodec_open2())
2917 uint8_t *subtitle_header;
2918 int subtitle_header_size;
2921 * Current packet as passed into the decoder, to avoid having
2922 * to pass the packet into every function. Currently only valid
2923 * inside lavc and get/release_buffer callbacks.
2924 * - decoding: set by avcodec_decode_*, read by get_buffer() for setting pkt_pts
2925 * - encoding: unused
2929 #if FF_API_INTERNAL_CONTEXT
2931 * Whether this is a copy of the context which had init() called on it.
2932 * This is used by multithreading - shared tables and picture pointers
2933 * should be freed from the original context only.
2934 * - encoding: Set by libavcodec.
2935 * - decoding: Set by libavcodec.
2937 * @deprecated this field has been moved to an internal context
2939 attribute_deprecated int is_copy;
2943 * Which multithreading methods to use.
2944 * Use of FF_THREAD_FRAME will increase decoding delay by one frame per thread,
2945 * so clients which cannot provide future frames should not use it.
2947 * - encoding: Set by user, otherwise the default is used.
2948 * - decoding: Set by user, otherwise the default is used.
2951 #define FF_THREAD_FRAME 1 ///< Decode more than one frame at once
2952 #define FF_THREAD_SLICE 2 ///< Decode more than one part of a single frame at once
2955 * Which multithreading methods are in use by the codec.
2956 * - encoding: Set by libavcodec.
2957 * - decoding: Set by libavcodec.
2959 int active_thread_type;
2962 * Set by the client if its custom get_buffer() callback can be called
2963 * from another thread, which allows faster multithreaded decoding.
2964 * draw_horiz_band() will be called from other threads regardless of this setting.
2965 * Ignored if the default get_buffer() is used.
2966 * - encoding: Set by user.
2967 * - decoding: Set by user.
2969 int thread_safe_callbacks;
2972 * VBV delay coded in the last frame (in periods of a 27 MHz clock).
2973 * Used for compliant TS muxing.
2974 * - encoding: Set by libavcodec.
2975 * - decoding: unused.
2980 * Type of service that the audio stream conveys.
2981 * - encoding: Set by user.
2982 * - decoding: Set by libavcodec.
2984 enum AVAudioServiceType audio_service_type;
2987 * Used to request a sample format from the decoder.
2988 * - encoding: unused.
2989 * - decoding: Set by user.
2991 enum AVSampleFormat request_sample_fmt;
2994 * Error recognition; may misdetect some more or less valid parts as errors.
2995 * - encoding: unused
2996 * - decoding: Set by user.
2998 int err_recognition;
2999 #define AV_EF_CRCCHECK (1<<0)
3000 #define AV_EF_BITSTREAM (1<<1)
3001 #define AV_EF_BUFFER (1<<2)
3002 #define AV_EF_EXPLODE (1<<3)
3005 * Private context used for internal data.
3007 * Unlike priv_data, this is not codec-specific. It is used in general
3008 * libavcodec functions.
3010 struct AVCodecInternal *internal;
3013 * - encoding: set by libavcodec
3014 * - decoding: Set by libavcodec
3016 enum AVFieldOrder field_order;
3022 typedef struct AVProfile {
3024 const char *name; ///< short name for the profile
3027 typedef struct AVCodecDefault AVCodecDefault;
3032 typedef struct AVCodec {
3034 * Name of the codec implementation.
3035 * The name is globally unique among encoders and among decoders (but an
3036 * encoder and a decoder can share the same name).
3037 * This is the primary way to find a codec from the user perspective.
3040 enum AVMediaType type;
3043 int (*init)(AVCodecContext *);
3044 int (*encode)(AVCodecContext *, uint8_t *buf, int buf_size, void *data);
3045 int (*close)(AVCodecContext *);
3046 int (*decode)(AVCodecContext *, void *outdata, int *outdata_size, AVPacket *avpkt);
3048 * Codec capabilities.
3052 struct AVCodec *next;
3055 * Will be called when seeking
3057 void (*flush)(AVCodecContext *);
3058 const AVRational *supported_framerates; ///< array of supported framerates, or NULL if any, array is terminated by {0,0}
3059 const enum PixelFormat *pix_fmts; ///< array of supported pixel formats, or NULL if unknown, array is terminated by -1
3061 * Descriptive name for the codec, meant to be more human readable than name.
3062 * You should use the NULL_IF_CONFIG_SMALL() macro to define it.
3064 const char *long_name;
3065 const int *supported_samplerates; ///< array of supported audio samplerates, or NULL if unknown, array is terminated by 0
3066 const enum AVSampleFormat *sample_fmts; ///< array of supported sample formats, or NULL if unknown, array is terminated by -1
3067 const uint64_t *channel_layouts; ///< array of support channel layouts, or NULL if unknown. array is terminated by 0
3068 uint8_t max_lowres; ///< maximum value for lowres supported by the decoder
3069 const AVClass *priv_class; ///< AVClass for the private context
3070 const AVProfile *profiles; ///< array of recognized profiles, or NULL if unknown, array is terminated by {FF_PROFILE_UNKNOWN}
3073 * @name Frame-level threading support functions
3077 * If defined, called on thread contexts when they are created.
3078 * If the codec allocates writable tables in init(), re-allocate them here.
3079 * priv_data will be set to a copy of the original.
3081 int (*init_thread_copy)(AVCodecContext *);
3083 * Copy necessary context variables from a previous thread context to the current one.
3084 * If not defined, the next thread will start automatically; otherwise, the codec
3085 * must call ff_thread_finish_setup().
3087 * dst and src will (rarely) point to the same context, in which case memcpy should be skipped.
3089 int (*update_thread_context)(AVCodecContext *dst, const AVCodecContext *src);
3093 * Private codec-specific defaults.
3095 const AVCodecDefault *defaults;
3098 * Initialize codec static data, called from avcodec_register().
3100 void (*init_static_data)(struct AVCodec *codec);
3103 * Encode data to an AVPacket.
3105 * @param avctx codec context
3106 * @param avpkt output AVPacket (may contain a user-provided buffer)
3107 * @param[in] frame AVFrame containing the raw data to be encoded
3108 * @param[out] got_packet_ptr encoder sets to 0 or 1 to indicate that a
3109 * non-empty packet was returned in avpkt.
3110 * @return 0 on success, negative error code on failure
3112 int (*encode2)(AVCodecContext *avctx, AVPacket *avpkt, const AVFrame *frame,
3113 int *got_packet_ptr);
3119 typedef struct AVHWAccel {
3121 * Name of the hardware accelerated codec.
3122 * The name is globally unique among encoders and among decoders (but an
3123 * encoder and a decoder can share the same name).
3128 * Type of codec implemented by the hardware accelerator.
3130 * See AVMEDIA_TYPE_xxx
3132 enum AVMediaType type;
3135 * Codec implemented by the hardware accelerator.
3142 * Supported pixel format.
3144 * Only hardware accelerated formats are supported here.
3146 enum PixelFormat pix_fmt;
3149 * Hardware accelerated codec capabilities.
3150 * see FF_HWACCEL_CODEC_CAP_*
3154 struct AVHWAccel *next;
3157 * Called at the beginning of each frame or field picture.
3159 * Meaningful frame information (codec specific) is guaranteed to
3160 * be parsed at this point. This function is mandatory.
3162 * Note that buf can be NULL along with buf_size set to 0.
3163 * Otherwise, this means the whole frame is available at this point.
3165 * @param avctx the codec context
3166 * @param buf the frame data buffer base
3167 * @param buf_size the size of the frame in bytes
3168 * @return zero if successful, a negative value otherwise
3170 int (*start_frame)(AVCodecContext *avctx, const uint8_t *buf, uint32_t buf_size);
3173 * Callback for each slice.
3175 * Meaningful slice information (codec specific) is guaranteed to
3176 * be parsed at this point. This function is mandatory.
3178 * @param avctx the codec context
3179 * @param buf the slice data buffer base
3180 * @param buf_size the size of the slice in bytes
3181 * @return zero if successful, a negative value otherwise
3183 int (*decode_slice)(AVCodecContext *avctx, const uint8_t *buf, uint32_t buf_size);
3186 * Called at the end of each frame or field picture.
3188 * The whole picture is parsed at this point and can now be sent
3189 * to the hardware accelerator. This function is mandatory.
3191 * @param avctx the codec context
3192 * @return zero if successful, a negative value otherwise
3194 int (*end_frame)(AVCodecContext *avctx);
3197 * Size of HW accelerator private data.
3199 * Private data is allocated with av_mallocz() before
3200 * AVCodecContext.get_buffer() and deallocated after
3201 * AVCodecContext.release_buffer().
3207 * four components are given, that's all.
3208 * the last component is alpha
3210 typedef struct AVPicture {
3211 uint8_t *data[AV_NUM_DATA_POINTERS];
3212 int linesize[AV_NUM_DATA_POINTERS]; ///< number of bytes per line
3215 #define AVPALETTE_SIZE 1024
3216 #define AVPALETTE_COUNT 256
3217 #if FF_API_PALETTE_CONTROL
3220 * This structure defines a method for communicating palette changes
3221 * between and demuxer and a decoder.
3223 * @deprecated Use AVPacket to send palette changes instead.
3224 * This is totally broken.
3226 typedef struct AVPaletteControl {
3228 /* Demuxer sets this to 1 to indicate the palette has changed;
3229 * decoder resets to 0. */
3230 int palette_changed;
3232 /* 4-byte ARGB palette entries, stored in native byte order; note that
3233 * the individual palette components should be on a 8-bit scale; if
3234 * the palette data comes from an IBM VGA native format, the component
3235 * data is probably 6 bits in size and needs to be scaled. */
3236 unsigned int palette[AVPALETTE_COUNT];
3238 } AVPaletteControl attribute_deprecated;
3241 enum AVSubtitleType {
3244 SUBTITLE_BITMAP, ///< A bitmap, pict will be set
3247 * Plain text, the text field must be set by the decoder and is
3248 * authoritative. ass and pict fields may contain approximations.
3253 * Formatted text, the ass field must be set by the decoder and is
3254 * authoritative. pict and text fields may contain approximations.
3259 typedef struct AVSubtitleRect {
3260 int x; ///< top left corner of pict, undefined when pict is not set
3261 int y; ///< top left corner of pict, undefined when pict is not set
3262 int w; ///< width of pict, undefined when pict is not set
3263 int h; ///< height of pict, undefined when pict is not set
3264 int nb_colors; ///< number of colors in pict, undefined when pict is not set
3267 * data+linesize for the bitmap of this subtitle.
3268 * can be set for text/ass as well once they where rendered
3271 enum AVSubtitleType type;
3273 char *text; ///< 0 terminated plain UTF-8 text
3276 * 0 terminated ASS/SSA compatible event line.
3277 * The pressentation of this is unaffected by the other values in this
3283 typedef struct AVSubtitle {
3284 uint16_t format; /* 0 = graphics */
3285 uint32_t start_display_time; /* relative to packet pts, in ms */
3286 uint32_t end_display_time; /* relative to packet pts, in ms */
3288 AVSubtitleRect **rects;
3289 int64_t pts; ///< Same as packet pts, in AV_TIME_BASE
3292 /* packet functions */
3295 * @deprecated use NULL instead
3297 attribute_deprecated void av_destruct_packet_nofree(AVPacket *pkt);
3300 * Default packet destructor.
3302 void av_destruct_packet(AVPacket *pkt);
3305 * Initialize optional fields of a packet with default values.
3309 void av_init_packet(AVPacket *pkt);
3312 * Allocate the payload of a packet and initialize its fields with
3316 * @param size wanted payload size
3317 * @return 0 if OK, AVERROR_xxx otherwise
3319 int av_new_packet(AVPacket *pkt, int size);
3322 * Reduce packet size, correctly zeroing padding
3325 * @param size new size
3327 void av_shrink_packet(AVPacket *pkt, int size);
3330 * Increase packet size, correctly zeroing padding
3333 * @param grow_by number of bytes by which to increase the size of the packet
3335 int av_grow_packet(AVPacket *pkt, int grow_by);
3338 * @warning This is a hack - the packet memory allocation stuff is broken. The
3339 * packet is allocated if it was not really allocated.
3341 int av_dup_packet(AVPacket *pkt);
3346 * @param pkt packet to free
3348 void av_free_packet(AVPacket *pkt);
3351 * Allocate new information of a packet.
3354 * @param type side information type
3355 * @param size side information size
3356 * @return pointer to fresh allocated data or NULL otherwise
3358 uint8_t* av_packet_new_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
3362 * Get side information from packet.
3365 * @param type desired side information type
3366 * @param size pointer for side information size to store (optional)
3367 * @return pointer to data if present or NULL otherwise
3369 uint8_t* av_packet_get_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
3374 struct ReSampleContext;
3375 struct AVResampleContext;
3377 typedef struct ReSampleContext ReSampleContext;
3380 * Initialize audio resampling context.
3382 * @param output_channels number of output channels
3383 * @param input_channels number of input channels
3384 * @param output_rate output sample rate
3385 * @param input_rate input sample rate
3386 * @param sample_fmt_out requested output sample format
3387 * @param sample_fmt_in input sample format
3388 * @param filter_length length of each FIR filter in the filterbank relative to the cutoff frequency
3389 * @param log2_phase_count log2 of the number of entries in the polyphase filterbank
3390 * @param linear if 1 then the used FIR filter will be linearly interpolated
3391 between the 2 closest, if 0 the closest will be used
3392 * @param cutoff cutoff frequency, 1.0 corresponds to half the output sampling rate
3393 * @return allocated ReSampleContext, NULL if error occurred
3395 ReSampleContext *av_audio_resample_init(int output_channels, int input_channels,
3396 int output_rate, int input_rate,
3397 enum AVSampleFormat sample_fmt_out,
3398 enum AVSampleFormat sample_fmt_in,
3399 int filter_length, int log2_phase_count,
3400 int linear, double cutoff);
3402 int audio_resample(ReSampleContext *s, short *output, short *input, int nb_samples);
3405 * Free resample context.
3407 * @param s a non-NULL pointer to a resample context previously
3408 * created with av_audio_resample_init()
3410 void audio_resample_close(ReSampleContext *s);
3414 * Initialize an audio resampler.
3415 * Note, if either rate is not an integer then simply scale both rates up so they are.
3416 * @param filter_length length of each FIR filter in the filterbank relative to the cutoff freq
3417 * @param log2_phase_count log2 of the number of entries in the polyphase filterbank
3418 * @param linear If 1 then the used FIR filter will be linearly interpolated
3419 between the 2 closest, if 0 the closest will be used
3420 * @param cutoff cutoff frequency, 1.0 corresponds to half the output sampling rate
3422 struct AVResampleContext *av_resample_init(int out_rate, int in_rate, int filter_length, int log2_phase_count, int linear, double cutoff);
3425 * Resample an array of samples using a previously configured context.
3426 * @param src an array of unconsumed samples
3427 * @param consumed the number of samples of src which have been consumed are returned here
3428 * @param src_size the number of unconsumed samples available
3429 * @param dst_size the amount of space in samples available in dst
3430 * @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.
3431 * @return the number of samples written in dst or -1 if an error occurred
3433 int av_resample(struct AVResampleContext *c, short *dst, short *src, int *consumed, int src_size, int dst_size, int update_ctx);
3437 * Compensate samplerate/timestamp drift. The compensation is done by changing
3438 * the resampler parameters, so no audible clicks or similar distortions occur
3439 * @param compensation_distance distance in output samples over which the compensation should be performed
3440 * @param sample_delta number of output samples which should be output less
3442 * example: av_resample_compensate(c, 10, 500)
3443 * here instead of 510 samples only 500 samples would be output
3445 * note, due to rounding the actual compensation might be slightly different,
3446 * especially if the compensation_distance is large and the in_rate used during init is small
3448 void av_resample_compensate(struct AVResampleContext *c, int sample_delta, int compensation_distance);
3449 void av_resample_close(struct AVResampleContext *c);
3452 * Allocate memory for a picture. Call avpicture_free() to free it.
3454 * @see avpicture_fill()
3456 * @param picture the picture to be filled in
3457 * @param pix_fmt the format of the picture
3458 * @param width the width of the picture
3459 * @param height the height of the picture
3460 * @return zero if successful, a negative value if not
3462 int avpicture_alloc(AVPicture *picture, enum PixelFormat pix_fmt, int width, int height);
3465 * Free a picture previously allocated by avpicture_alloc().
3466 * The data buffer used by the AVPicture is freed, but the AVPicture structure
3469 * @param picture the AVPicture to be freed
3471 void avpicture_free(AVPicture *picture);
3474 * Fill in the AVPicture fields.
3475 * The fields of the given AVPicture are filled in by using the 'ptr' address
3476 * which points to the image data buffer. Depending on the specified picture
3477 * format, one or multiple image data pointers and line sizes will be set.
3478 * If a planar format is specified, several pointers will be set pointing to
3479 * the different picture planes and the line sizes of the different planes
3480 * will be stored in the lines_sizes array.
3481 * Call with ptr == NULL to get the required size for the ptr buffer.
3483 * To allocate the buffer and fill in the AVPicture fields in one call,
3484 * use avpicture_alloc().
3486 * @param picture AVPicture whose fields are to be filled in
3487 * @param ptr Buffer which will contain or contains the actual image data
3488 * @param pix_fmt The format in which the picture data is stored.
3489 * @param width the width of the image in pixels
3490 * @param height the height of the image in pixels
3491 * @return size of the image data in bytes
3493 int avpicture_fill(AVPicture *picture, uint8_t *ptr,
3494 enum PixelFormat pix_fmt, int width, int height);
3497 * Copy pixel data from an AVPicture into a buffer.
3498 * The data is stored compactly, without any gaps for alignment or padding
3499 * which may be applied by avpicture_fill().
3501 * @see avpicture_get_size()
3503 * @param[in] src AVPicture containing image data
3504 * @param[in] pix_fmt The format in which the picture data is stored.
3505 * @param[in] width the width of the image in pixels.
3506 * @param[in] height the height of the image in pixels.
3507 * @param[out] dest A buffer into which picture data will be copied.
3508 * @param[in] dest_size The size of 'dest'.
3509 * @return The number of bytes written to dest, or a negative value (error code) on error.
3511 int avpicture_layout(const AVPicture* src, enum PixelFormat pix_fmt, int width, int height,
3512 unsigned char *dest, int dest_size);
3515 * Calculate the size in bytes that a picture of the given width and height
3516 * would occupy if stored in the given picture format.
3517 * Note that this returns the size of a compact representation as generated
3518 * by avpicture_layout(), which can be smaller than the size required for e.g.
3521 * @param pix_fmt the given picture format
3522 * @param width the width of the image
3523 * @param height the height of the image
3524 * @return Image data size in bytes or -1 on error (e.g. too large dimensions).
3526 int avpicture_get_size(enum PixelFormat pix_fmt, int width, int height);
3527 void avcodec_get_chroma_sub_sample(enum PixelFormat pix_fmt, int *h_shift, int *v_shift);
3529 #if FF_API_GET_PIX_FMT_NAME
3531 * @deprecated Deprecated in favor of av_get_pix_fmt_name().
3533 attribute_deprecated
3534 const char *avcodec_get_pix_fmt_name(enum PixelFormat pix_fmt);
3537 void avcodec_set_dimensions(AVCodecContext *s, int width, int height);
3540 * Return a value representing the fourCC code associated to the
3541 * pixel format pix_fmt, or 0 if no associated fourCC code can be
3544 unsigned int avcodec_pix_fmt_to_codec_tag(enum PixelFormat pix_fmt);
3547 * Put a string representing the codec tag codec_tag in buf.
3549 * @param buf_size size in bytes of buf
3550 * @return the length of the string that would have been generated if
3551 * enough space had been available, excluding the trailing null
3553 size_t av_get_codec_tag_string(char *buf, size_t buf_size, unsigned int codec_tag);
3555 #define FF_LOSS_RESOLUTION 0x0001 /**< loss due to resolution change */
3556 #define FF_LOSS_DEPTH 0x0002 /**< loss due to color depth change */
3557 #define FF_LOSS_COLORSPACE 0x0004 /**< loss due to color space conversion */
3558 #define FF_LOSS_ALPHA 0x0008 /**< loss of alpha bits */
3559 #define FF_LOSS_COLORQUANT 0x0010 /**< loss due to color quantization */
3560 #define FF_LOSS_CHROMA 0x0020 /**< loss of chroma (e.g. RGB to gray conversion) */
3563 * Compute what kind of losses will occur when converting from one specific
3564 * pixel format to another.
3565 * When converting from one pixel format to another, information loss may occur.
3566 * For example, when converting from RGB24 to GRAY, the color information will
3567 * be lost. Similarly, other losses occur when converting from some formats to
3568 * other formats. These losses can involve loss of chroma, but also loss of
3569 * resolution, loss of color depth, loss due to the color space conversion, loss
3570 * of the alpha bits or loss due to color quantization.
3571 * avcodec_get_fix_fmt_loss() informs you about the various types of losses
3572 * which will occur when converting from one pixel format to another.
3574 * @param[in] dst_pix_fmt destination pixel format
3575 * @param[in] src_pix_fmt source pixel format
3576 * @param[in] has_alpha Whether the source pixel format alpha channel is used.
3577 * @return Combination of flags informing you what kind of losses will occur.
3579 int avcodec_get_pix_fmt_loss(enum PixelFormat dst_pix_fmt, enum PixelFormat src_pix_fmt,
3583 * Find the best pixel format to convert to given a certain source pixel
3584 * format. When converting from one pixel format to another, information loss
3585 * may occur. For example, when converting from RGB24 to GRAY, the color
3586 * information will be lost. Similarly, other losses occur when converting from
3587 * some formats to other formats. avcodec_find_best_pix_fmt() searches which of
3588 * the given pixel formats should be used to suffer the least amount of loss.
3589 * The pixel formats from which it chooses one, are determined by the
3590 * pix_fmt_mask parameter.
3593 * src_pix_fmt = PIX_FMT_YUV420P;
3594 * pix_fmt_mask = (1 << PIX_FMT_YUV422P) || (1 << PIX_FMT_RGB24);
3595 * dst_pix_fmt = avcodec_find_best_pix_fmt(pix_fmt_mask, src_pix_fmt, alpha, &loss);
3598 * @param[in] pix_fmt_mask bitmask determining which pixel format to choose from
3599 * @param[in] src_pix_fmt source pixel format
3600 * @param[in] has_alpha Whether the source pixel format alpha channel is used.
3601 * @param[out] loss_ptr Combination of flags informing you what kind of losses will occur.
3602 * @return The best pixel format to convert to or -1 if none was found.
3604 enum PixelFormat avcodec_find_best_pix_fmt(int64_t pix_fmt_mask, enum PixelFormat src_pix_fmt,
3605 int has_alpha, int *loss_ptr);
3607 #if FF_API_GET_ALPHA_INFO
3608 #define FF_ALPHA_TRANSP 0x0001 /* image has some totally transparent pixels */
3609 #define FF_ALPHA_SEMI_TRANSP 0x0002 /* image has some transparent pixels */
3612 * Tell if an image really has transparent alpha values.
3613 * @return ored mask of FF_ALPHA_xxx constants
3615 attribute_deprecated
3616 int img_get_alpha_info(const AVPicture *src,
3617 enum PixelFormat pix_fmt, int width, int height);
3620 /* deinterlace a picture */
3621 /* deinterlace - if not supported return -1 */
3622 int avpicture_deinterlace(AVPicture *dst, const AVPicture *src,
3623 enum PixelFormat pix_fmt, int width, int height);
3625 /* external high level API */
3628 * If c is NULL, returns the first registered codec,
3629 * if c is non-NULL, returns the next registered codec after c,
3630 * or NULL if c is the last one.
3632 AVCodec *av_codec_next(AVCodec *c);
3635 * Return the LIBAVCODEC_VERSION_INT constant.
3637 unsigned avcodec_version(void);
3640 * Return the libavcodec build-time configuration.
3642 const char *avcodec_configuration(void);
3645 * Return the libavcodec license.
3647 const char *avcodec_license(void);
3649 #if FF_API_AVCODEC_INIT
3651 * @deprecated this function is called automatically from avcodec_register()
3652 * and avcodec_register_all(), there is no need to call it manually
3654 attribute_deprecated
3655 void avcodec_init(void);
3659 * Register the codec codec and initialize libavcodec.
3661 * @warning either this function or avcodec_register_all() must be called
3662 * before any other libavcodec functions.
3664 * @see avcodec_register_all()
3666 void avcodec_register(AVCodec *codec);
3669 * Find a registered encoder with a matching codec ID.
3671 * @param id CodecID of the requested encoder
3672 * @return An encoder if one was found, NULL otherwise.
3674 AVCodec *avcodec_find_encoder(enum CodecID id);
3677 * Find a registered encoder with the specified name.
3679 * @param name name of the requested encoder
3680 * @return An encoder if one was found, NULL otherwise.
3682 AVCodec *avcodec_find_encoder_by_name(const char *name);
3685 * Find a registered decoder with a matching codec ID.
3687 * @param id CodecID of the requested decoder
3688 * @return A decoder if one was found, NULL otherwise.
3690 AVCodec *avcodec_find_decoder(enum CodecID id);
3693 * Find a registered decoder with the specified name.
3695 * @param name name of the requested decoder
3696 * @return A decoder if one was found, NULL otherwise.
3698 AVCodec *avcodec_find_decoder_by_name(const char *name);
3699 void avcodec_string(char *buf, int buf_size, AVCodecContext *enc, int encode);
3702 * Return a name for the specified profile, if available.
3704 * @param codec the codec that is searched for the given profile
3705 * @param profile the profile value for which a name is requested
3706 * @return A name for the profile if found, NULL otherwise.
3708 const char *av_get_profile_name(const AVCodec *codec, int profile);
3710 #if FF_API_ALLOC_CONTEXT
3712 * Set the fields of the given AVCodecContext to default values.
3714 * @param s The AVCodecContext of which the fields should be set to default values.
3715 * @deprecated use avcodec_get_context_defaults3
3717 attribute_deprecated
3718 void avcodec_get_context_defaults(AVCodecContext *s);
3720 /** THIS FUNCTION IS NOT YET PART OF THE PUBLIC API!
3721 * we WILL change its arguments and name a few times! */
3722 attribute_deprecated
3723 void avcodec_get_context_defaults2(AVCodecContext *s, enum AVMediaType);
3727 * Set the fields of the given AVCodecContext to default values corresponding
3728 * to the given codec (defaults may be codec-dependent).
3730 * Do not call this function if a non-NULL codec has been passed
3731 * to avcodec_alloc_context3() that allocated this AVCodecContext.
3732 * If codec is non-NULL, it is illegal to call avcodec_open2() with a
3733 * different codec on this AVCodecContext.
3735 int avcodec_get_context_defaults3(AVCodecContext *s, AVCodec *codec);
3737 #if FF_API_ALLOC_CONTEXT
3739 * Allocate an AVCodecContext and set its fields to default values. The
3740 * resulting struct can be deallocated by simply calling av_free().
3742 * @return An AVCodecContext filled with default values or NULL on failure.
3743 * @see avcodec_get_context_defaults
3745 * @deprecated use avcodec_alloc_context3()
3747 attribute_deprecated
3748 AVCodecContext *avcodec_alloc_context(void);
3750 /** THIS FUNCTION IS NOT YET PART OF THE PUBLIC API!
3751 * we WILL change its arguments and name a few times! */
3752 attribute_deprecated
3753 AVCodecContext *avcodec_alloc_context2(enum AVMediaType);
3757 * Allocate an AVCodecContext and set its fields to default values. The
3758 * resulting struct can be deallocated by simply calling av_free().
3760 * @param codec if non-NULL, allocate private data and initialize defaults
3761 * for the given codec. It is illegal to then call avcodec_open2()
3762 * with a different codec.
3764 * @return An AVCodecContext filled with default values or NULL on failure.
3765 * @see avcodec_get_context_defaults
3767 AVCodecContext *avcodec_alloc_context3(AVCodec *codec);
3770 * Copy the settings of the source AVCodecContext into the destination
3771 * AVCodecContext. The resulting destination codec context will be
3772 * unopened, i.e. you are required to call avcodec_open2() before you
3773 * can use this AVCodecContext to decode/encode video/audio data.
3775 * @param dest target codec context, should be initialized with
3776 * avcodec_alloc_context3(), but otherwise uninitialized
3777 * @param src source codec context
3778 * @return AVERROR() on error (e.g. memory allocation error), 0 on success
3780 int avcodec_copy_context(AVCodecContext *dest, const AVCodecContext *src);
3783 * Set the fields of the given AVFrame to default values.
3785 * @param pic The AVFrame of which the fields should be set to default values.
3787 void avcodec_get_frame_defaults(AVFrame *pic);
3790 * Allocate an AVFrame and set its fields to default values. The resulting
3791 * struct can be deallocated by simply calling av_free().
3793 * @return An AVFrame filled with default values or NULL on failure.
3794 * @see avcodec_get_frame_defaults
3796 AVFrame *avcodec_alloc_frame(void);
3798 int avcodec_default_get_buffer(AVCodecContext *s, AVFrame *pic);
3799 void avcodec_default_release_buffer(AVCodecContext *s, AVFrame *pic);
3800 int avcodec_default_reget_buffer(AVCodecContext *s, AVFrame *pic);
3803 * Return the amount of padding in pixels which the get_buffer callback must
3804 * provide around the edge of the image for codecs which do not have the
3805 * CODEC_FLAG_EMU_EDGE flag.
3807 * @return Required padding in pixels.
3809 unsigned avcodec_get_edge_width(void);
3811 * Modify width and height values so that they will result in a memory
3812 * buffer that is acceptable for the codec if you do not use any horizontal
3815 * May only be used if a codec with CODEC_CAP_DR1 has been opened.
3816 * If CODEC_FLAG_EMU_EDGE is not set, the dimensions must have been increased
3817 * according to avcodec_get_edge_width() before.
3819 void avcodec_align_dimensions(AVCodecContext *s, int *width, int *height);
3821 * Modify width and height values so that they will result in a memory
3822 * buffer that is acceptable for the codec if you also ensure that all
3823 * line sizes are a multiple of the respective linesize_align[i].
3825 * May only be used if a codec with CODEC_CAP_DR1 has been opened.
3826 * If CODEC_FLAG_EMU_EDGE is not set, the dimensions must have been increased
3827 * according to avcodec_get_edge_width() before.
3829 void avcodec_align_dimensions2(AVCodecContext *s, int *width, int *height,
3830 int linesize_align[AV_NUM_DATA_POINTERS]);
3832 enum PixelFormat avcodec_default_get_format(struct AVCodecContext *s, const enum PixelFormat * fmt);
3834 #if FF_API_THREAD_INIT
3836 * @deprecated Set s->thread_count before calling avcodec_open2() instead of calling this.
3838 attribute_deprecated
3839 int avcodec_thread_init(AVCodecContext *s, int thread_count);
3842 int avcodec_default_execute(AVCodecContext *c, int (*func)(AVCodecContext *c2, void *arg2),void *arg, int *ret, int count, int size);
3843 int avcodec_default_execute2(AVCodecContext *c, int (*func)(AVCodecContext *c2, void *arg2, int, int),void *arg, int *ret, int count);
3844 //FIXME func typedef
3846 #if FF_API_AVCODEC_OPEN
3848 * Initialize the AVCodecContext to use the given AVCodec. Prior to using this
3849 * function the context has to be allocated.
3851 * The functions avcodec_find_decoder_by_name(), avcodec_find_encoder_by_name(),
3852 * avcodec_find_decoder() and avcodec_find_encoder() provide an easy way for
3853 * retrieving a codec.
3855 * @warning This function is not thread safe!
3858 * avcodec_register_all();
3859 * codec = avcodec_find_decoder(CODEC_ID_H264);
3863 * context = avcodec_alloc_context3(codec);
3865 * if (avcodec_open(context, codec) < 0)
3869 * @param avctx The context which will be set up to use the given codec.
3870 * @param codec The codec to use within the context.
3871 * @return zero on success, a negative value on error
3872 * @see avcodec_alloc_context3, avcodec_find_decoder, avcodec_find_encoder, avcodec_close
3874 * @deprecated use avcodec_open2
3876 attribute_deprecated
3877 int avcodec_open(AVCodecContext *avctx, AVCodec *codec);
3881 * Initialize the AVCodecContext to use the given AVCodec. Prior to using this
3882 * function the context has to be allocated with avcodec_alloc_context3().
3884 * The functions avcodec_find_decoder_by_name(), avcodec_find_encoder_by_name(),
3885 * avcodec_find_decoder() and avcodec_find_encoder() provide an easy way for
3886 * retrieving a codec.
3888 * @warning This function is not thread safe!
3891 * avcodec_register_all();
3892 * av_dict_set(&opts, "b", "2.5M", 0);
3893 * codec = avcodec_find_decoder(CODEC_ID_H264);
3897 * context = avcodec_alloc_context3(codec);
3899 * if (avcodec_open2(context, codec, opts) < 0)
3903 * @param avctx The context to initialize.
3904 * @param options A dictionary filled with AVCodecContext and codec-private options.
3905 * On return this object will be filled with options that were not found.
3907 * @return zero on success, a negative value on error
3908 * @see avcodec_alloc_context3(), avcodec_find_decoder(), avcodec_find_encoder(),
3909 * av_dict_set(), av_opt_find().
3911 int avcodec_open2(AVCodecContext *avctx, AVCodec *codec, AVDictionary **options);
3913 #if FF_API_OLD_DECODE_AUDIO
3915 * Wrapper function which calls avcodec_decode_audio4.
3917 * @deprecated Use avcodec_decode_audio4 instead.
3919 * Decode the audio frame of size avpkt->size from avpkt->data into samples.
3920 * Some decoders may support multiple frames in a single AVPacket, such
3921 * decoders would then just decode the first frame. In this case,
3922 * avcodec_decode_audio3 has to be called again with an AVPacket that contains
3923 * the remaining data in order to decode the second frame etc.
3925 * could be outputted, frame_size_ptr is zero. Otherwise, it is the
3926 * decompressed frame size in bytes.
3928 * @warning You must set frame_size_ptr to the allocated size of the
3929 * output buffer before calling avcodec_decode_audio3().
3931 * @warning The input buffer must be FF_INPUT_BUFFER_PADDING_SIZE larger than
3932 * the actual read bytes because some optimized bitstream readers read 32 or 64
3933 * bits at once and could read over the end.
3935 * @warning The end of the input buffer avpkt->data should be set to 0 to ensure that
3936 * no overreading happens for damaged MPEG streams.
3938 * @warning You must not provide a custom get_buffer() when using
3939 * avcodec_decode_audio3(). Doing so will override it with
3940 * avcodec_default_get_buffer. Use avcodec_decode_audio4() instead,
3941 * which does allow the application to provide a custom get_buffer().
3943 * @note You might have to align the input buffer avpkt->data and output buffer
3944 * samples. The alignment requirements depend on the CPU: On some CPUs it isn't
3945 * necessary at all, on others it won't work at all if not aligned and on others
3946 * it will work but it will have an impact on performance.
3948 * In practice, avpkt->data should have 4 byte alignment at minimum and
3949 * samples should be 16 byte aligned unless the CPU doesn't need it
3950 * (AltiVec and SSE do).
3952 * @note Codecs which have the CODEC_CAP_DELAY capability set have a delay
3953 * between input and output, these need to be fed with avpkt->data=NULL,
3954 * avpkt->size=0 at the end to return the remaining frames.
3956 * @param avctx the codec context
3957 * @param[out] samples the output buffer, sample type in avctx->sample_fmt
3958 * If the sample format is planar, each channel plane will
3959 * be the same size, with no padding between channels.
3960 * @param[in,out] frame_size_ptr the output buffer size in bytes
3961 * @param[in] avpkt The input AVPacket containing the input buffer.
3962 * You can create such packet with av_init_packet() and by then setting
3963 * data and size, some decoders might in addition need other fields.
3964 * All decoders are designed to use the least fields possible though.
3965 * @return On error a negative value is returned, otherwise the number of bytes
3966 * used or zero if no frame data was decompressed (used) from the input AVPacket.
3968 attribute_deprecated int avcodec_decode_audio3(AVCodecContext *avctx, int16_t *samples,
3969 int *frame_size_ptr,
3974 * Decode the audio frame of size avpkt->size from avpkt->data into frame.
3976 * Some decoders may support multiple frames in a single AVPacket. Such
3977 * decoders would then just decode the first frame. In this case,
3978 * avcodec_decode_audio4 has to be called again with an AVPacket containing
3979 * the remaining data in order to decode the second frame, etc...
3980 * Even if no frames are returned, the packet needs to be fed to the decoder
3981 * with remaining data until it is completely consumed or an error occurs.
3983 * @warning The input buffer, avpkt->data must be FF_INPUT_BUFFER_PADDING_SIZE
3984 * larger than the actual read bytes because some optimized bitstream
3985 * readers read 32 or 64 bits at once and could read over the end.
3987 * @note You might have to align the input buffer. The alignment requirements
3988 * depend on the CPU and the decoder.
3990 * @param avctx the codec context
3991 * @param[out] frame The AVFrame in which to store decoded audio samples.
3992 * Decoders request a buffer of a particular size by setting
3993 * AVFrame.nb_samples prior to calling get_buffer(). The
3994 * decoder may, however, only utilize part of the buffer by
3995 * setting AVFrame.nb_samples to a smaller value in the
3997 * @param[out] got_frame_ptr Zero if no frame could be decoded, otherwise it is
3999 * @param[in] avpkt The input AVPacket containing the input buffer.
4000 * At least avpkt->data and avpkt->size should be set. Some
4001 * decoders might also require additional fields to be set.
4002 * @return A negative error code is returned if an error occurred during
4003 * decoding, otherwise the number of bytes consumed from the input
4004 * AVPacket is returned.
4006 int avcodec_decode_audio4(AVCodecContext *avctx, AVFrame *frame,
4007 int *got_frame_ptr, AVPacket *avpkt);
4010 * Decode the video frame of size avpkt->size from avpkt->data into picture.
4011 * Some decoders may support multiple frames in a single AVPacket, such
4012 * decoders would then just decode the first frame.
4014 * @warning The input buffer must be FF_INPUT_BUFFER_PADDING_SIZE larger than
4015 * the actual read bytes because some optimized bitstream readers read 32 or 64
4016 * bits at once and could read over the end.
4018 * @warning The end of the input buffer buf should be set to 0 to ensure that
4019 * no overreading happens for damaged MPEG streams.
4021 * @note You might have to align the input buffer avpkt->data.
4022 * The alignment requirements depend on the CPU: on some CPUs it isn't
4023 * necessary at all, on others it won't work at all if not aligned and on others
4024 * it will work but it will have an impact on performance.
4026 * In practice, avpkt->data should have 4 byte alignment at minimum.
4028 * @note Codecs which have the CODEC_CAP_DELAY capability set have a delay
4029 * between input and output, these need to be fed with avpkt->data=NULL,
4030 * avpkt->size=0 at the end to return the remaining frames.
4032 * @param avctx the codec context
4033 * @param[out] picture The AVFrame in which the decoded video frame will be stored.
4034 * Use avcodec_alloc_frame to get an AVFrame, the codec will
4035 * allocate memory for the actual bitmap.
4036 * with default get/release_buffer(), the decoder frees/reuses the bitmap as it sees fit.
4037 * with overridden get/release_buffer() (needs CODEC_CAP_DR1) the user decides into what buffer the decoder
4038 * decodes and the decoder tells the user once it does not need the data anymore,
4039 * the user app can at this point free/reuse/keep the memory as it sees fit.
4041 * @param[in] avpkt The input AVpacket containing the input buffer.
4042 * You can create such packet with av_init_packet() and by then setting
4043 * data and size, some decoders might in addition need other fields like
4044 * flags&AV_PKT_FLAG_KEY. All decoders are designed to use the least
4046 * @param[in,out] got_picture_ptr Zero if no frame could be decompressed, otherwise, it is nonzero.
4047 * @return On error a negative value is returned, otherwise the number of bytes
4048 * used or zero if no frame could be decompressed.
4050 int avcodec_decode_video2(AVCodecContext *avctx, AVFrame *picture,
4051 int *got_picture_ptr,
4055 * Decode a subtitle message.
4056 * Return a negative value on error, otherwise return the number of bytes used.
4057 * If no subtitle could be decompressed, got_sub_ptr is zero.
4058 * Otherwise, the subtitle is stored in *sub.
4059 * Note that CODEC_CAP_DR1 is not available for subtitle codecs. This is for
4060 * simplicity, because the performance difference is expect to be negligible
4061 * and reusing a get_buffer written for video codecs would probably perform badly
4062 * due to a potentially very different allocation pattern.
4064 * @param avctx the codec context
4065 * @param[out] sub The AVSubtitle in which the decoded subtitle will be stored, must be
4066 freed with avsubtitle_free if *got_sub_ptr is set.
4067 * @param[in,out] got_sub_ptr Zero if no subtitle could be decompressed, otherwise, it is nonzero.
4068 * @param[in] avpkt The input AVPacket containing the input buffer.
4070 int avcodec_decode_subtitle2(AVCodecContext *avctx, AVSubtitle *sub,
4075 * Free all allocated data in the given subtitle struct.
4077 * @param sub AVSubtitle to free.
4079 void avsubtitle_free(AVSubtitle *sub);
4081 #if FF_API_OLD_ENCODE_AUDIO
4083 * Encode an audio frame from samples into buf.
4085 * @deprecated Use avcodec_encode_audio2 instead.
4087 * @note The output buffer should be at least FF_MIN_BUFFER_SIZE bytes large.
4088 * However, for codecs with avctx->frame_size equal to 0 (e.g. PCM) the user
4089 * will know how much space is needed because it depends on the value passed
4090 * in buf_size as described below. In that case a lower value can be used.
4092 * @param avctx the codec context
4093 * @param[out] buf the output buffer
4094 * @param[in] buf_size the output buffer size
4095 * @param[in] samples the input buffer containing the samples
4096 * The number of samples read from this buffer is frame_size*channels,
4097 * both of which are defined in avctx.
4098 * For codecs which have avctx->frame_size equal to 0 (e.g. PCM) the number of
4099 * samples read from samples is equal to:
4100 * buf_size * 8 / (avctx->channels * av_get_bits_per_sample(avctx->codec_id))
4101 * This also implies that av_get_bits_per_sample() must not return 0 for these
4103 * @return On error a negative value is returned, on success zero or the number
4104 * of bytes used to encode the data read from the input buffer.
4106 int attribute_deprecated avcodec_encode_audio(AVCodecContext *avctx,
4107 uint8_t *buf, int buf_size,
4108 const short *samples);
4112 * Encode a frame of audio.
4114 * Takes input samples from frame and writes the next output packet, if
4115 * available, to avpkt. The output packet does not necessarily contain data for
4116 * the most recent frame, as encoders can delay, split, and combine input frames
4117 * internally as needed.
4119 * @param avctx codec context
4120 * @param avpkt output AVPacket.
4121 * The user can supply an output buffer by setting
4122 * avpkt->data and avpkt->size prior to calling the
4123 * function, but if the size of the user-provided data is not
4124 * large enough, encoding will fail. All other AVPacket fields
4125 * will be reset by the encoder using av_init_packet(). If
4126 * avpkt->data is NULL, the encoder will allocate it.
4127 * The encoder will set avpkt->size to the size of the
4129 * @param[in] frame AVFrame containing the raw audio data to be encoded.
4130 * May be NULL when flushing an encoder that has the
4131 * CODEC_CAP_DELAY capability set.
4132 * There are 2 codec capabilities that affect the allowed
4133 * values of frame->nb_samples.
4134 * If CODEC_CAP_SMALL_LAST_FRAME is set, then only the final
4135 * frame may be smaller than avctx->frame_size, and all other
4136 * frames must be equal to avctx->frame_size.
4137 * If CODEC_CAP_VARIABLE_FRAME_SIZE is set, then each frame
4138 * can have any number of samples.
4139 * If neither is set, frame->nb_samples must be equal to
4140 * avctx->frame_size for all frames.
4141 * @param[out] got_packet_ptr This field is set to 1 by libavcodec if the
4142 * output packet is non-empty, and to 0 if it is
4143 * empty. If the function returns an error, the
4144 * packet can be assumed to be invalid, and the
4145 * value of got_packet_ptr is undefined and should
4147 * @return 0 on success, negative error code on failure
4149 int avcodec_encode_audio2(AVCodecContext *avctx, AVPacket *avpkt,
4150 const AVFrame *frame, int *got_packet_ptr);
4153 * Fill audio frame data and linesize.
4154 * AVFrame extended_data channel pointers are allocated if necessary for
4157 * @param frame the AVFrame
4158 * frame->nb_samples must be set prior to calling the
4159 * function. This function fills in frame->data,
4160 * frame->extended_data, frame->linesize[0].
4161 * @param nb_channels channel count
4162 * @param sample_fmt sample format
4163 * @param buf buffer to use for frame data
4164 * @param buf_size size of buffer
4165 * @param align plane size sample alignment
4166 * @return 0 on success, negative error code on failure
4168 int avcodec_fill_audio_frame(AVFrame *frame, int nb_channels,
4169 enum AVSampleFormat sample_fmt, const uint8_t *buf,
4170 int buf_size, int align);
4173 * Encode a video frame from pict into buf.
4174 * The input picture should be
4175 * stored using a specific format, namely avctx.pix_fmt.
4177 * @param avctx the codec context
4178 * @param[out] buf the output buffer for the bitstream of encoded frame
4179 * @param[in] buf_size the size of the output buffer in bytes
4180 * @param[in] pict the input picture to encode
4181 * @return On error a negative value is returned, on success zero or the number
4182 * of bytes used from the output buffer.
4184 int avcodec_encode_video(AVCodecContext *avctx, uint8_t *buf, int buf_size,
4185 const AVFrame *pict);
4186 int avcodec_encode_subtitle(AVCodecContext *avctx, uint8_t *buf, int buf_size,
4187 const AVSubtitle *sub);
4189 int avcodec_close(AVCodecContext *avctx);
4192 * Register all the codecs, parsers and bitstream filters which were enabled at
4193 * configuration time. If you do not call this function you can select exactly
4194 * which formats you want to support, by using the individual registration
4197 * @see avcodec_register
4198 * @see av_register_codec_parser
4199 * @see av_register_bitstream_filter
4201 void avcodec_register_all(void);
4204 * Flush buffers, should be called when seeking or when switching to a different stream.
4206 void avcodec_flush_buffers(AVCodecContext *avctx);
4208 void avcodec_default_free_buffers(AVCodecContext *s);
4210 /* misc useful functions */
4212 #if FF_API_OLD_FF_PICT_TYPES
4214 * Return a single letter to describe the given picture type pict_type.
4216 * @param[in] pict_type the picture type
4217 * @return A single character representing the picture type.
4218 * @deprecated Use av_get_picture_type_char() instead.
4220 attribute_deprecated
4221 char av_get_pict_type_char(int pict_type);
4225 * Return codec bits per sample.
4227 * @param[in] codec_id the codec
4228 * @return Number of bits per sample or zero if unknown for the given codec.
4230 int av_get_bits_per_sample(enum CodecID codec_id);
4232 #if FF_API_OLD_SAMPLE_FMT
4234 * @deprecated Use av_get_bytes_per_sample() instead.
4236 attribute_deprecated
4237 int av_get_bits_per_sample_format(enum AVSampleFormat sample_fmt);
4241 typedef struct AVCodecParserContext {
4243 struct AVCodecParser *parser;
4244 int64_t frame_offset; /* offset of the current frame */
4245 int64_t cur_offset; /* current offset
4246 (incremented by each av_parser_parse()) */
4247 int64_t next_frame_offset; /* offset of the next frame */
4249 int pict_type; /* XXX: Put it back in AVCodecContext. */
4251 * This field is used for proper frame duration computation in lavf.
4252 * It signals, how much longer the frame duration of the current frame
4253 * is compared to normal frame duration.
4255 * frame_duration = (1 + repeat_pict) * time_base
4257 * It is used by codecs like H.264 to display telecined material.
4259 int repeat_pict; /* XXX: Put it back in AVCodecContext. */
4260 int64_t pts; /* pts of the current frame */
4261 int64_t dts; /* dts of the current frame */
4266 int fetch_timestamp;
4268 #define AV_PARSER_PTS_NB 4
4269 int cur_frame_start_index;
4270 int64_t cur_frame_offset[AV_PARSER_PTS_NB];
4271 int64_t cur_frame_pts[AV_PARSER_PTS_NB];
4272 int64_t cur_frame_dts[AV_PARSER_PTS_NB];
4275 #define PARSER_FLAG_COMPLETE_FRAMES 0x0001
4276 #define PARSER_FLAG_ONCE 0x0002
4277 /// Set if the parser has a valid file offset
4278 #define PARSER_FLAG_FETCHED_OFFSET 0x0004
4280 int64_t offset; ///< byte offset from starting packet start
4281 int64_t cur_frame_end[AV_PARSER_PTS_NB];
4284 * Set by parser to 1 for key frames and 0 for non-key frames.
4285 * It is initialized to -1, so if the parser doesn't set this flag,
4286 * old-style fallback using AV_PICTURE_TYPE_I picture type as key frames
4292 * Time difference in stream time base units from the pts of this
4293 * packet to the point at which the output from the decoder has converged
4294 * independent from the availability of previous frames. That is, the
4295 * frames are virtually identical no matter if decoding started from
4296 * the very first frame or from this keyframe.
4297 * Is AV_NOPTS_VALUE if unknown.
4298 * This field is not the display duration of the current frame.
4299 * This field has no meaning if the packet does not have AV_PKT_FLAG_KEY
4302 * The purpose of this field is to allow seeking in streams that have no
4303 * keyframes in the conventional sense. It corresponds to the
4304 * recovery point SEI in H.264 and match_time_delta in NUT. It is also
4305 * essential for some types of subtitle streams to ensure that all
4306 * subtitles are correctly displayed after seeking.
4308 int64_t convergence_duration;
4310 // Timestamp generation support:
4312 * Synchronization point for start of timestamp generation.
4314 * Set to >0 for sync point, 0 for no sync point and <0 for undefined
4317 * For example, this corresponds to presence of H.264 buffering period
4323 * Offset of the current timestamp against last timestamp sync point in
4324 * units of AVCodecContext.time_base.
4326 * Set to INT_MIN when dts_sync_point unused. Otherwise, it must
4327 * contain a valid timestamp offset.
4329 * Note that the timestamp of sync point has usually a nonzero
4330 * dts_ref_dts_delta, which refers to the previous sync point. Offset of
4331 * the next frame after timestamp sync point will be usually 1.
4333 * For example, this corresponds to H.264 cpb_removal_delay.
4335 int dts_ref_dts_delta;
4338 * Presentation delay of current frame in units of AVCodecContext.time_base.
4340 * Set to INT_MIN when dts_sync_point unused. Otherwise, it must
4341 * contain valid non-negative timestamp delta (presentation time of a frame
4342 * must not lie in the past).
4344 * This delay represents the difference between decoding and presentation
4345 * time of the frame.
4347 * For example, this corresponds to H.264 dpb_output_delay.
4352 * Position of the packet in file.
4354 * Analogous to cur_frame_pts/dts
4356 int64_t cur_frame_pos[AV_PARSER_PTS_NB];
4359 * Byte position of currently parsed frame in stream.
4364 * Previous frame byte position.
4367 } AVCodecParserContext;
4369 typedef struct AVCodecParser {
4370 int codec_ids[5]; /* several codec IDs are permitted */
4372 int (*parser_init)(AVCodecParserContext *s);
4373 int (*parser_parse)(AVCodecParserContext *s,
4374 AVCodecContext *avctx,
4375 const uint8_t **poutbuf, int *poutbuf_size,
4376 const uint8_t *buf, int buf_size);
4377 void (*parser_close)(AVCodecParserContext *s);
4378 int (*split)(AVCodecContext *avctx, const uint8_t *buf, int buf_size);
4379 struct AVCodecParser *next;
4382 AVCodecParser *av_parser_next(AVCodecParser *c);
4384 void av_register_codec_parser(AVCodecParser *parser);
4385 AVCodecParserContext *av_parser_init(int codec_id);
4390 * @param s parser context.
4391 * @param avctx codec context.
4392 * @param poutbuf set to pointer to parsed buffer or NULL if not yet finished.
4393 * @param poutbuf_size set to size of parsed buffer or zero if not yet finished.
4394 * @param buf input buffer.
4395 * @param buf_size input length, to signal EOF, this should be 0 (so that the last frame can be output).
4396 * @param pts input presentation timestamp.
4397 * @param dts input decoding timestamp.
4398 * @param pos input byte position in stream.
4399 * @return the number of bytes of the input bitstream used.
4404 * len = av_parser_parse2(myparser, AVCodecContext, &data, &size,
4411 * decode_frame(data, size);
4415 int av_parser_parse2(AVCodecParserContext *s,
4416 AVCodecContext *avctx,
4417 uint8_t **poutbuf, int *poutbuf_size,
4418 const uint8_t *buf, int buf_size,
4419 int64_t pts, int64_t dts,
4422 int av_parser_change(AVCodecParserContext *s,
4423 AVCodecContext *avctx,
4424 uint8_t **poutbuf, int *poutbuf_size,
4425 const uint8_t *buf, int buf_size, int keyframe);
4426 void av_parser_close(AVCodecParserContext *s);
4429 typedef struct AVBitStreamFilterContext {
4431 struct AVBitStreamFilter *filter;
4432 AVCodecParserContext *parser;
4433 struct AVBitStreamFilterContext *next;
4434 } AVBitStreamFilterContext;
4437 typedef struct AVBitStreamFilter {
4440 int (*filter)(AVBitStreamFilterContext *bsfc,
4441 AVCodecContext *avctx, const char *args,
4442 uint8_t **poutbuf, int *poutbuf_size,
4443 const uint8_t *buf, int buf_size, int keyframe);
4444 void (*close)(AVBitStreamFilterContext *bsfc);
4445 struct AVBitStreamFilter *next;
4446 } AVBitStreamFilter;
4448 void av_register_bitstream_filter(AVBitStreamFilter *bsf);
4449 AVBitStreamFilterContext *av_bitstream_filter_init(const char *name);
4450 int av_bitstream_filter_filter(AVBitStreamFilterContext *bsfc,
4451 AVCodecContext *avctx, const char *args,
4452 uint8_t **poutbuf, int *poutbuf_size,
4453 const uint8_t *buf, int buf_size, int keyframe);
4454 void av_bitstream_filter_close(AVBitStreamFilterContext *bsf);
4456 AVBitStreamFilter *av_bitstream_filter_next(AVBitStreamFilter *f);
4461 * Reallocate the given block if it is not large enough, otherwise do nothing.
4465 void *av_fast_realloc(void *ptr, unsigned int *size, size_t min_size);
4468 * Allocate a buffer, reusing the given one if large enough.
4470 * Contrary to av_fast_realloc the current buffer contents might not be
4471 * preserved and on error the old buffer is freed, thus no special
4472 * handling to avoid memleaks is necessary.
4474 * @param ptr pointer to pointer to already allocated buffer, overwritten with pointer to new buffer
4475 * @param size size of the buffer *ptr points to
4476 * @param min_size minimum size of *ptr buffer after returning, *ptr will be NULL and
4477 * *size 0 if an error occurred.
4479 void av_fast_malloc(void *ptr, unsigned int *size, size_t min_size);
4482 * Copy image src to dst. Wraps av_picture_data_copy() above.
4484 void av_picture_copy(AVPicture *dst, const AVPicture *src,
4485 enum PixelFormat pix_fmt, int width, int height);
4488 * Crop image top and left side.
4490 int av_picture_crop(AVPicture *dst, const AVPicture *src,
4491 enum PixelFormat pix_fmt, int top_band, int left_band);
4496 int av_picture_pad(AVPicture *dst, const AVPicture *src, int height, int width, enum PixelFormat pix_fmt,
4497 int padtop, int padbottom, int padleft, int padright, int *color);
4500 * Encode extradata length to a buffer. Used by xiph codecs.
4502 * @param s buffer to write to; must be at least (v/255+1) bytes long
4503 * @param v size of extradata in bytes
4504 * @return number of bytes written to the buffer.
4506 unsigned int av_xiphlacing(unsigned char *s, unsigned int v);
4509 * Log a generic warning message about a missing feature. This function is
4510 * intended to be used internally by Libav (libavcodec, libavformat, etc.)
4511 * only, and would normally not be used by applications.
4512 * @param[in] avc a pointer to an arbitrary struct of which the first field is
4513 * a pointer to an AVClass struct
4514 * @param[in] feature string containing the name of the missing feature
4515 * @param[in] want_sample indicates if samples are wanted which exhibit this feature.
4516 * If want_sample is non-zero, additional verbage will be added to the log
4517 * message which tells the user how to report samples to the development
4520 void av_log_missing_feature(void *avc, const char *feature, int want_sample);
4523 * Log a generic warning message asking for a sample. This function is
4524 * intended to be used internally by Libav (libavcodec, libavformat, etc.)
4525 * only, and would normally not be used by applications.
4526 * @param[in] avc a pointer to an arbitrary struct of which the first field is
4527 * a pointer to an AVClass struct
4528 * @param[in] msg string containing an optional message, or NULL if no message
4530 void av_log_ask_for_sample(void *avc, const char *msg, ...) av_printf_format(2, 3);
4533 * Register the hardware accelerator hwaccel.
4535 void av_register_hwaccel(AVHWAccel *hwaccel);
4538 * If hwaccel is NULL, returns the first registered hardware accelerator,
4539 * if hwaccel is non-NULL, returns the next registered hardware accelerator
4540 * after hwaccel, or NULL if hwaccel is the last one.
4542 AVHWAccel *av_hwaccel_next(AVHWAccel *hwaccel);
4546 * Lock operation used by lockmgr
4549 AV_LOCK_CREATE, ///< Create a mutex
4550 AV_LOCK_OBTAIN, ///< Lock the mutex
4551 AV_LOCK_RELEASE, ///< Unlock the mutex
4552 AV_LOCK_DESTROY, ///< Free mutex resources
4556 * Register a user provided lock manager supporting the operations
4557 * specified by AVLockOp. mutex points to a (void *) where the
4558 * lockmgr should store/get a pointer to a user allocated mutex. It's
4559 * NULL upon AV_LOCK_CREATE and != NULL for all other ops.
4561 * @param cb User defined callback. Note: Libav may invoke calls to this
4562 * callback during the call to av_lockmgr_register().
4563 * Thus, the application must be prepared to handle that.
4564 * If cb is set to NULL the lockmgr will be unregistered.
4565 * Also note that during unregistration the previously registered
4566 * lockmgr callback may also be invoked.
4568 int av_lockmgr_register(int (*cb)(void **mutex, enum AVLockOp op));
4571 * Get the type of the given codec.
4573 enum AVMediaType avcodec_get_type(enum CodecID codec_id);
4576 * Get the AVClass for AVCodecContext. It can be used in combination with
4577 * AV_OPT_SEARCH_FAKE_OBJ for examining options.
4579 * @see av_opt_find().
4581 const AVClass *avcodec_get_class(void);
4583 #endif /* AVCODEC_AVCODEC_H */