2 * copyright (c) 2001 Fabrice Bellard
4 * This file is part of FFmpeg.
6 * FFmpeg is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
11 * FFmpeg is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with FFmpeg; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21 #ifndef AVCODEC_AVCODEC_H
22 #define AVCODEC_AVCODEC_H
30 #include "libavutil/samplefmt.h"
31 #include "libavutil/avutil.h"
32 #include "libavutil/cpu.h"
33 #include "libavutil/dict.h"
34 #include "libavutil/log.h"
35 #include "libavutil/pixfmt.h"
36 #include "libavutil/rational.h"
37 #include "libavutil/audioconvert.h"
39 #include "libavcodec/version.h"
41 * @defgroup libavc Encoding/Decoding Library
44 * @defgroup lavc_decoding Decoding
48 * @defgroup lavc_encoding Encoding
52 * @defgroup lavc_codec Codecs
54 * @defgroup lavc_codec_native Native Codecs
57 * @defgroup lavc_codec_wrappers External library wrappers
60 * @defgroup lavc_codec_hwaccel Hardware Accelerators bridge
64 * @defgroup lavc_internal Internal
72 * @defgroup lavc_core Core functions/structures.
75 * Basic definitions, functions for querying libavcodec capabilities,
76 * allocating core structures, etc.
81 * Identify the syntax and semantics of the bitstream.
82 * The principle is roughly:
83 * Two decoders with the same ID can decode the same streams.
84 * Two encoders with the same ID can encode compatible streams.
85 * There may be slight deviations from the principle due to implementation
88 * If you add a codec ID to this list, add it so that
89 * 1. no value of a existing codec ID changes (that would break ABI),
90 * 2. Give it a value which when taken as ASCII is recognized uniquely by a human as this specific codec.
91 * This ensures that 2 forks can independently add CodecIDs without producing conflicts.
98 CODEC_ID_MPEG2VIDEO, ///< preferred ID for MPEG-1/2 video decoding
99 CODEC_ID_MPEG2VIDEO_XVMC,
136 CODEC_ID_INTERPLAY_VIDEO,
148 CODEC_ID_TRUEMOTION1,
175 CODEC_ID_TRUEMOTION2,
192 CODEC_ID_DSICINVIDEO,
193 CODEC_ID_TIERTEXSEQVIDEO,
201 CODEC_ID_BETHSOFTVID,
217 CODEC_ID_MOTIONPIXELS,
235 CODEC_ID_IFF_BYTERUN1,
262 CODEC_ID_Y41P = MKBETAG('Y','4','1','P'),
263 CODEC_ID_ESCAPE130 = MKBETAG('E','1','3','0'),
264 CODEC_ID_EXR = MKBETAG('0','E','X','R'),
265 CODEC_ID_AVRP = MKBETAG('A','V','R','P'),
267 CODEC_ID_G2M = MKBETAG( 0 ,'G','2','M'),
268 CODEC_ID_AVUI = MKBETAG('A','V','U','I'),
269 CODEC_ID_AYUV = MKBETAG('A','Y','U','V'),
270 CODEC_ID_V308 = MKBETAG('V','3','0','8'),
271 CODEC_ID_V408 = MKBETAG('V','4','0','8'),
272 CODEC_ID_YUV4 = MKBETAG('Y','U','V','4'),
273 CODEC_ID_SANM = MKBETAG('S','A','N','M'),
274 CODEC_ID_PAF_VIDEO = MKBETAG('P','A','F','V'),
276 /* various PCM "codecs" */
277 CODEC_ID_FIRST_AUDIO = 0x10000, ///< A dummy id pointing at the start of audio codecs
278 CODEC_ID_PCM_S16LE = 0x10000,
294 CODEC_ID_PCM_S24DAUD,
296 CODEC_ID_PCM_S16LE_PLANAR,
305 CODEC_ID_PCM_S8_PLANAR,
307 /* various ADPCM codecs */
308 CODEC_ID_ADPCM_IMA_QT = 0x11000,
309 CODEC_ID_ADPCM_IMA_WAV,
310 CODEC_ID_ADPCM_IMA_DK3,
311 CODEC_ID_ADPCM_IMA_DK4,
312 CODEC_ID_ADPCM_IMA_WS,
313 CODEC_ID_ADPCM_IMA_SMJPEG,
322 CODEC_ID_ADPCM_YAMAHA,
323 CODEC_ID_ADPCM_SBPRO_4,
324 CODEC_ID_ADPCM_SBPRO_3,
325 CODEC_ID_ADPCM_SBPRO_2,
327 CODEC_ID_ADPCM_IMA_AMV,
328 CODEC_ID_ADPCM_EA_R1,
329 CODEC_ID_ADPCM_EA_R3,
330 CODEC_ID_ADPCM_EA_R2,
331 CODEC_ID_ADPCM_IMA_EA_SEAD,
332 CODEC_ID_ADPCM_IMA_EA_EACS,
333 CODEC_ID_ADPCM_EA_XAS,
334 CODEC_ID_ADPCM_EA_MAXIS_XA,
335 CODEC_ID_ADPCM_IMA_ISS,
337 CODEC_ID_ADPCM_IMA_APC,
338 CODEC_ID_VIMA = MKBETAG('V','I','M','A'),
341 CODEC_ID_AMR_NB = 0x12000,
344 /* RealAudio codecs*/
345 CODEC_ID_RA_144 = 0x13000,
348 /* various DPCM codecs */
349 CODEC_ID_ROQ_DPCM = 0x14000,
350 CODEC_ID_INTERPLAY_DPCM,
355 CODEC_ID_MP2 = 0x15000,
356 CODEC_ID_MP3, ///< preferred ID for decoding MPEG audio layer 1, 2 or 3
372 CODEC_ID_WESTWOOD_SND1,
373 CODEC_ID_GSM, ///< as in Berlin toast format
381 CODEC_ID_DSICINAUDIO,
385 CODEC_ID_GSM_MS, /* as found in WAV */
394 CODEC_ID_WMALOSSLESS,
403 CODEC_ID_BINKAUDIO_RDFT,
404 CODEC_ID_BINKAUDIO_DCT,
416 CODEC_ID_FFWAVESYNTH = MKBETAG('F','F','W','S'),
417 CODEC_ID_8SVX_RAW = MKBETAG('8','S','V','X'),
418 CODEC_ID_SONIC = MKBETAG('S','O','N','C'),
419 CODEC_ID_SONIC_LS = MKBETAG('S','O','N','L'),
420 CODEC_ID_PAF_AUDIO = MKBETAG('P','A','F','A'),
422 /* subtitle codecs */
423 CODEC_ID_FIRST_SUBTITLE = 0x17000, ///< A dummy ID pointing at the start of subtitle codecs.
424 CODEC_ID_DVD_SUBTITLE = 0x17000,
425 CODEC_ID_DVB_SUBTITLE,
426 CODEC_ID_TEXT, ///< raw UTF-8 text
430 CODEC_ID_HDMV_PGS_SUBTITLE,
431 CODEC_ID_DVB_TELETEXT,
433 CODEC_ID_MICRODVD = MKBETAG('m','D','V','D'),
434 CODEC_ID_EIA_608 = MKBETAG('c','6','0','8'),
435 CODEC_ID_JACOSUB = MKBETAG('J','S','U','B'),
436 CODEC_ID_SAMI = MKBETAG('S','A','M','I'),
437 CODEC_ID_REALTEXT = MKBETAG('R','T','X','T'),
439 /* other specific kind of codecs (generally used for attachments) */
440 CODEC_ID_FIRST_UNKNOWN = 0x18000, ///< A dummy ID pointing at the start of various fake codecs.
441 CODEC_ID_TTF = 0x18000,
442 CODEC_ID_BINTEXT = MKBETAG('B','T','X','T'),
443 CODEC_ID_XBIN = MKBETAG('X','B','I','N'),
444 CODEC_ID_IDF = MKBETAG( 0 ,'I','D','F'),
446 CODEC_ID_PROBE = 0x19000, ///< codec_id is not known (like CODEC_ID_NONE) but lavf should attempt to identify it
448 CODEC_ID_MPEG2TS = 0x20000, /**< _FAKE_ codec to indicate a raw MPEG-2 TS
449 * stream (only used by libavformat) */
450 CODEC_ID_MPEG4SYSTEMS = 0x20001, /**< _FAKE_ codec to indicate a MPEG-4 Systems
451 * stream (only used by libavformat) */
452 CODEC_ID_FFMETADATA = 0x21000, ///< Dummy codec for streams containing only metadata information.
455 #if FF_API_OLD_DECODE_AUDIO
457 #define AVCODEC_MAX_AUDIO_FRAME_SIZE 192000 // 1 second of 48khz 32bit audio
461 * @ingroup lavc_decoding
462 * Required number of additionally allocated bytes at the end of the input bitstream for decoding.
463 * This is mainly needed because some optimized bitstream readers read
464 * 32 or 64 bit at once and could read over the end.<br>
465 * Note: If the first 23 bits of the additional bytes are not 0, then damaged
466 * MPEG bitstreams could cause overread and segfault.
468 #define FF_INPUT_BUFFER_PADDING_SIZE 16
471 * @ingroup lavc_encoding
472 * minimum encoding buffer size
473 * Used to avoid some checks during header writing.
475 #define FF_MIN_BUFFER_SIZE 16384
479 * @ingroup lavc_encoding
480 * motion estimation type.
483 ME_ZERO = 1, ///< no search, that is use 0,0 vector whenever one is needed
487 ME_EPZS, ///< enhanced predictive zonal search
488 ME_X1, ///< reserved for experiments
489 ME_HEX, ///< hexagon based search
490 ME_UMH, ///< uneven multi-hexagon search
491 ME_ITER, ///< iterative search
492 ME_TESA, ///< transformed exhaustive search algorithm
496 * @ingroup lavc_decoding
499 /* We leave some space between them for extensions (drop some
500 * keyframes for intra-only or drop just some bidir frames). */
501 AVDISCARD_NONE =-16, ///< discard nothing
502 AVDISCARD_DEFAULT = 0, ///< discard useless packets like 0 size packets in avi
503 AVDISCARD_NONREF = 8, ///< discard all non reference
504 AVDISCARD_BIDIR = 16, ///< discard all bidirectional frames
505 AVDISCARD_NONKEY = 32, ///< discard all frames except keyframes
506 AVDISCARD_ALL = 48, ///< discard all
509 enum AVColorPrimaries{
510 AVCOL_PRI_BT709 = 1, ///< also ITU-R BT1361 / IEC 61966-2-4 / SMPTE RP177 Annex B
511 AVCOL_PRI_UNSPECIFIED = 2,
512 AVCOL_PRI_BT470M = 4,
513 AVCOL_PRI_BT470BG = 5, ///< also ITU-R BT601-6 625 / ITU-R BT1358 625 / ITU-R BT1700 625 PAL & SECAM
514 AVCOL_PRI_SMPTE170M = 6, ///< also ITU-R BT601-6 525 / ITU-R BT1358 525 / ITU-R BT1700 NTSC
515 AVCOL_PRI_SMPTE240M = 7, ///< functionally identical to above
517 AVCOL_PRI_NB , ///< Not part of ABI
520 enum AVColorTransferCharacteristic{
521 AVCOL_TRC_BT709 = 1, ///< also ITU-R BT1361
522 AVCOL_TRC_UNSPECIFIED = 2,
523 AVCOL_TRC_GAMMA22 = 4, ///< also ITU-R BT470M / ITU-R BT1700 625 PAL & SECAM
524 AVCOL_TRC_GAMMA28 = 5, ///< also ITU-R BT470BG
525 AVCOL_TRC_SMPTE240M = 7,
526 AVCOL_TRC_NB , ///< Not part of ABI
531 AVCOL_SPC_BT709 = 1, ///< also ITU-R BT1361 / IEC 61966-2-4 xvYCC709 / SMPTE RP177 Annex B
532 AVCOL_SPC_UNSPECIFIED = 2,
534 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
535 AVCOL_SPC_SMPTE170M = 6, ///< also ITU-R BT601-6 525 / ITU-R BT1358 525 / ITU-R BT1700 NTSC / functionally identical to above
536 AVCOL_SPC_SMPTE240M = 7,
537 AVCOL_SPC_YCOCG = 8, ///< Used by Dirac / VC-2 and H.264 FRext, see ITU-T SG16
538 AVCOL_SPC_NB , ///< Not part of ABI
540 #define AVCOL_SPC_YCGCO AVCOL_SPC_YCOCG
543 AVCOL_RANGE_UNSPECIFIED = 0,
544 AVCOL_RANGE_MPEG = 1, ///< the normal 219*2^(n-8) "MPEG" YUV ranges
545 AVCOL_RANGE_JPEG = 2, ///< the normal 2^n-1 "JPEG" YUV ranges
546 AVCOL_RANGE_NB , ///< Not part of ABI
550 * X X 3 4 X X are luma samples,
551 * 1 2 1-6 are possible chroma positions
552 * X X 5 6 X 0 is undefined/unknown position
554 enum AVChromaLocation{
555 AVCHROMA_LOC_UNSPECIFIED = 0,
556 AVCHROMA_LOC_LEFT = 1, ///< mpeg2/4, h264 default
557 AVCHROMA_LOC_CENTER = 2, ///< mpeg1, jpeg, h263
558 AVCHROMA_LOC_TOPLEFT = 3, ///< DV
559 AVCHROMA_LOC_TOP = 4,
560 AVCHROMA_LOC_BOTTOMLEFT = 5,
561 AVCHROMA_LOC_BOTTOM = 6,
562 AVCHROMA_LOC_NB , ///< Not part of ABI
565 enum AVAudioServiceType {
566 AV_AUDIO_SERVICE_TYPE_MAIN = 0,
567 AV_AUDIO_SERVICE_TYPE_EFFECTS = 1,
568 AV_AUDIO_SERVICE_TYPE_VISUALLY_IMPAIRED = 2,
569 AV_AUDIO_SERVICE_TYPE_HEARING_IMPAIRED = 3,
570 AV_AUDIO_SERVICE_TYPE_DIALOGUE = 4,
571 AV_AUDIO_SERVICE_TYPE_COMMENTARY = 5,
572 AV_AUDIO_SERVICE_TYPE_EMERGENCY = 6,
573 AV_AUDIO_SERVICE_TYPE_VOICE_OVER = 7,
574 AV_AUDIO_SERVICE_TYPE_KARAOKE = 8,
575 AV_AUDIO_SERVICE_TYPE_NB , ///< Not part of ABI
579 * @ingroup lavc_encoding
581 typedef struct RcOverride{
584 int qscale; // If this is 0 then quality_factor will be used instead.
585 float quality_factor;
588 #define FF_MAX_B_FRAMES 16
591 These flags can be passed in AVCodecContext.flags before initialization.
592 Note: Not everything is supported yet.
595 #define CODEC_FLAG_QSCALE 0x0002 ///< Use fixed qscale.
596 #define CODEC_FLAG_4MV 0x0004 ///< 4 MV per MB allowed / advanced prediction for H.263.
597 #define CODEC_FLAG_QPEL 0x0010 ///< Use qpel MC.
598 #define CODEC_FLAG_GMC 0x0020 ///< Use GMC.
599 #define CODEC_FLAG_MV0 0x0040 ///< Always try a MB with MV=<0,0>.
601 * The parent program guarantees that the input for B-frames containing
602 * streams is not written to for at least s->max_b_frames+1 frames, if
603 * this is not set the input will be copied.
605 #define CODEC_FLAG_INPUT_PRESERVED 0x0100
606 #define CODEC_FLAG_PASS1 0x0200 ///< Use internal 2pass ratecontrol in first pass mode.
607 #define CODEC_FLAG_PASS2 0x0400 ///< Use internal 2pass ratecontrol in second pass mode.
608 #define CODEC_FLAG_GRAY 0x2000 ///< Only decode/encode grayscale.
609 #define CODEC_FLAG_EMU_EDGE 0x4000 ///< Don't draw edges.
610 #define CODEC_FLAG_PSNR 0x8000 ///< error[?] variables will be set during encoding.
611 #define CODEC_FLAG_TRUNCATED 0x00010000 /** Input bitstream might be truncated at a random
612 location instead of only at frame boundaries. */
613 #define CODEC_FLAG_NORMALIZE_AQP 0x00020000 ///< Normalize adaptive quantization.
614 #define CODEC_FLAG_INTERLACED_DCT 0x00040000 ///< Use interlaced DCT.
615 #define CODEC_FLAG_LOW_DELAY 0x00080000 ///< Force low delay.
616 #define CODEC_FLAG_GLOBAL_HEADER 0x00400000 ///< Place global headers in extradata instead of every keyframe.
617 #define CODEC_FLAG_BITEXACT 0x00800000 ///< Use only bitexact stuff (except (I)DCT).
618 /* Fx : Flag for h263+ extra options */
619 #define CODEC_FLAG_AC_PRED 0x01000000 ///< H.263 advanced intra coding / MPEG-4 AC prediction
620 #define CODEC_FLAG_LOOP_FILTER 0x00000800 ///< loop filter
621 #define CODEC_FLAG_INTERLACED_ME 0x20000000 ///< interlaced motion estimation
622 #define CODEC_FLAG_CLOSED_GOP 0x80000000
623 #define CODEC_FLAG2_FAST 0x00000001 ///< Allow non spec compliant speedup tricks.
624 #define CODEC_FLAG2_NO_OUTPUT 0x00000004 ///< Skip bitstream encoding.
625 #define CODEC_FLAG2_LOCAL_HEADER 0x00000008 ///< Place global headers at every keyframe instead of in extradata.
626 #define CODEC_FLAG2_DROP_FRAME_TIMECODE 0x00002000 ///< timecode is in drop frame format. DEPRECATED!!!!
627 #if FF_API_MPV_GLOBAL_OPTS
628 #define CODEC_FLAG_CBP_RD 0x04000000 ///< Use rate distortion optimization for cbp.
629 #define CODEC_FLAG_QP_RD 0x08000000 ///< Use rate distortion optimization for qp selectioon.
630 #define CODEC_FLAG2_STRICT_GOP 0x00000002 ///< Strictly enforce GOP size.
631 #define CODEC_FLAG2_SKIP_RD 0x00004000 ///< RD optimal MB level residual skipping
633 #define CODEC_FLAG2_CHUNKS 0x00008000 ///< Input bitstream might be truncated at a packet boundaries instead of only at frame boundaries.
634 #define CODEC_FLAG2_SHOW_ALL 0x00400000 ///< Show all frames before the first keyframe
636 /* Unsupported options :
637 * Syntax Arithmetic coding (SAC)
638 * Reference Picture Selection
639 * Independent Segment Decoding */
641 /* codec capabilities */
643 #define CODEC_CAP_DRAW_HORIZ_BAND 0x0001 ///< Decoder can use draw_horiz_band callback.
645 * Codec uses get_buffer() for allocating buffers and supports custom allocators.
646 * If not set, it might not use get_buffer() at all or use operations that
647 * assume the buffer was allocated by avcodec_default_get_buffer.
649 #define CODEC_CAP_DR1 0x0002
650 #define CODEC_CAP_TRUNCATED 0x0008
651 /* Codec can export data for HW decoding (XvMC). */
652 #define CODEC_CAP_HWACCEL 0x0010
654 * Encoder or decoder requires flushing with NULL input at the end in order to
655 * give the complete and correct output.
657 * NOTE: If this flag is not set, the codec is guaranteed to never be fed with
658 * with NULL data. The user can still send NULL data to the public encode
659 * or decode function, but libavcodec will not pass it along to the codec
660 * unless this flag is set.
663 * The decoder has a non-zero delay and needs to be fed with avpkt->data=NULL,
664 * avpkt->size=0 at the end to get the delayed data until the decoder no longer
668 * The encoder needs to be fed with NULL data at the end of encoding until the
669 * encoder no longer returns data.
671 * NOTE: For encoders implementing the AVCodec.encode2() function, setting this
672 * flag also means that the encoder must set the pts and duration for
673 * each output packet. If this flag is not set, the pts and duration will
674 * be determined by libavcodec from the input frame.
676 #define CODEC_CAP_DELAY 0x0020
678 * Codec can be fed a final frame with a smaller size.
679 * This can be used to prevent truncation of the last audio samples.
681 #define CODEC_CAP_SMALL_LAST_FRAME 0x0040
683 * Codec can export data for HW decoding (VDPAU).
685 #define CODEC_CAP_HWACCEL_VDPAU 0x0080
687 * Codec can output multiple frames per AVPacket
688 * Normally demuxers return one frame at a time, demuxers which do not do
689 * are connected to a parser to split what they return into proper frames.
690 * This flag is reserved to the very rare category of codecs which have a
691 * bitstream that cannot be split into frames without timeconsuming
692 * operations like full decoding. Demuxers carring such bitstreams thus
693 * may return multiple frames in a packet. This has many disadvantages like
694 * prohibiting stream copy in many cases thus it should only be considered
697 #define CODEC_CAP_SUBFRAMES 0x0100
699 * Codec is experimental and is thus avoided in favor of non experimental
702 #define CODEC_CAP_EXPERIMENTAL 0x0200
704 * Codec should fill in channel configuration and samplerate instead of container
706 #define CODEC_CAP_CHANNEL_CONF 0x0400
709 * Codec is able to deal with negative linesizes
711 #define CODEC_CAP_NEG_LINESIZES 0x0800
714 * Codec supports frame-level multithreading.
716 #define CODEC_CAP_FRAME_THREADS 0x1000
718 * Codec supports slice-based (or partition-based) multithreading.
720 #define CODEC_CAP_SLICE_THREADS 0x2000
722 * Codec supports changed parameters at any point.
724 #define CODEC_CAP_PARAM_CHANGE 0x4000
726 * Codec supports avctx->thread_count == 0 (auto).
728 #define CODEC_CAP_AUTO_THREADS 0x8000
730 * Audio encoder supports receiving a different number of samples in each call.
732 #define CODEC_CAP_VARIABLE_FRAME_SIZE 0x10000
734 * Codec is intra only.
736 #define CODEC_CAP_INTRA_ONLY 0x40000000
740 #define CODEC_CAP_LOSSLESS 0x80000000
742 //The following defines may change, don't expect compatibility if you use them.
743 #define MB_TYPE_INTRA4x4 0x0001
744 #define MB_TYPE_INTRA16x16 0x0002 //FIXME H.264-specific
745 #define MB_TYPE_INTRA_PCM 0x0004 //FIXME H.264-specific
746 #define MB_TYPE_16x16 0x0008
747 #define MB_TYPE_16x8 0x0010
748 #define MB_TYPE_8x16 0x0020
749 #define MB_TYPE_8x8 0x0040
750 #define MB_TYPE_INTERLACED 0x0080
751 #define MB_TYPE_DIRECT2 0x0100 //FIXME
752 #define MB_TYPE_ACPRED 0x0200
753 #define MB_TYPE_GMC 0x0400
754 #define MB_TYPE_SKIP 0x0800
755 #define MB_TYPE_P0L0 0x1000
756 #define MB_TYPE_P1L0 0x2000
757 #define MB_TYPE_P0L1 0x4000
758 #define MB_TYPE_P1L1 0x8000
759 #define MB_TYPE_L0 (MB_TYPE_P0L0 | MB_TYPE_P1L0)
760 #define MB_TYPE_L1 (MB_TYPE_P0L1 | MB_TYPE_P1L1)
761 #define MB_TYPE_L0L1 (MB_TYPE_L0 | MB_TYPE_L1)
762 #define MB_TYPE_QUANT 0x00010000
763 #define MB_TYPE_CBP 0x00020000
764 //Note bits 24-31 are reserved for codec specific use (h264 ref0, mpeg1 0mv, ...)
768 * This specifies the area which should be displayed.
769 * Note there may be multiple such areas for one frame.
771 typedef struct AVPanScan{
774 * - encoding: Set by user.
775 * - decoding: Set by libavcodec.
780 * width and height in 1/16 pel
781 * - encoding: Set by user.
782 * - decoding: Set by libavcodec.
788 * position of the top left corner in 1/16 pel for up to 3 fields/frames
789 * - encoding: Set by user.
790 * - decoding: Set by libavcodec.
792 int16_t position[3][2];
795 #define FF_QSCALE_TYPE_MPEG1 0
796 #define FF_QSCALE_TYPE_MPEG2 1
797 #define FF_QSCALE_TYPE_H264 2
798 #define FF_QSCALE_TYPE_VP56 3
800 #define FF_BUFFER_TYPE_INTERNAL 1
801 #define FF_BUFFER_TYPE_USER 2 ///< direct rendering buffers (image is (de)allocated by user)
802 #define FF_BUFFER_TYPE_SHARED 4 ///< Buffer from somewhere else; don't deallocate image (data/base), all other tables are not shared.
803 #define FF_BUFFER_TYPE_COPY 8 ///< Just a (modified) copy of some other buffer, don't deallocate anything.
805 #define FF_BUFFER_HINTS_VALID 0x01 // Buffer hints value is meaningful (if 0 ignore).
806 #define FF_BUFFER_HINTS_READABLE 0x02 // Codec will read from buffer.
807 #define FF_BUFFER_HINTS_PRESERVE 0x04 // User must not alter buffer content.
808 #define FF_BUFFER_HINTS_REUSABLE 0x08 // Codec will reuse the buffer (update).
811 * @defgroup lavc_packet AVPacket
813 * Types and functions for working with AVPacket.
816 enum AVPacketSideDataType {
818 AV_PKT_DATA_NEW_EXTRADATA,
821 * An AV_PKT_DATA_PARAM_CHANGE side data packet is laid out as follows:
824 * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_COUNT)
825 * s32le channel_count
826 * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_LAYOUT)
827 * u64le channel_layout
828 * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_SAMPLE_RATE)
830 * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_DIMENSIONS)
835 AV_PKT_DATA_PARAM_CHANGE,
838 * An AV_PKT_DATA_H263_MB_INFO side data packet contains a number of
839 * structures with info about macroblocks relevant to splitting the
840 * packet into smaller packets on macroblock edges (e.g. as for RFC 2190).
841 * That is, it does not necessarily contain info about all macroblocks,
842 * as long as the distance between macroblocks in the info is smaller
843 * than the target payload size.
844 * Each MB info structure is 12 bytes, and is laid out as follows:
846 * u32le bit offset from the start of the packet
847 * u8 current quantizer at the start of the macroblock
849 * u16le macroblock address within the GOB
850 * u8 horizontal MV predictor
851 * u8 vertical MV predictor
852 * u8 horizontal MV predictor for block number 3
853 * u8 vertical MV predictor for block number 3
856 AV_PKT_DATA_H263_MB_INFO,
859 typedef struct AVPacket {
861 * Presentation timestamp in AVStream->time_base units; the time at which
862 * the decompressed packet will be presented to the user.
863 * Can be AV_NOPTS_VALUE if it is not stored in the file.
864 * pts MUST be larger or equal to dts as presentation cannot happen before
865 * decompression, unless one wants to view hex dumps. Some formats misuse
866 * the terms dts and pts/cts to mean something different. Such timestamps
867 * must be converted to true pts/dts before they are stored in AVPacket.
871 * Decompression timestamp in AVStream->time_base units; the time at which
872 * the packet is decompressed.
873 * Can be AV_NOPTS_VALUE if it is not stored in the file.
880 * A combination of AV_PKT_FLAG values
884 * Additional packet data that can be provided by the container.
885 * Packet can contain several types of side information.
890 enum AVPacketSideDataType type;
895 * Duration of this packet in AVStream->time_base units, 0 if unknown.
896 * Equals next_pts - this_pts in presentation order.
899 void (*destruct)(struct AVPacket *);
901 int64_t pos; ///< byte position in stream, -1 if unknown
904 * Time difference in AVStream->time_base units from the pts of this
905 * packet to the point at which the output from the decoder has converged
906 * independent from the availability of previous frames. That is, the
907 * frames are virtually identical no matter if decoding started from
908 * the very first frame or from this keyframe.
909 * Is AV_NOPTS_VALUE if unknown.
910 * This field is not the display duration of the current packet.
911 * This field has no meaning if the packet does not have AV_PKT_FLAG_KEY
914 * The purpose of this field is to allow seeking in streams that have no
915 * keyframes in the conventional sense. It corresponds to the
916 * recovery point SEI in H.264 and match_time_delta in NUT. It is also
917 * essential for some types of subtitle streams to ensure that all
918 * subtitles are correctly displayed after seeking.
920 int64_t convergence_duration;
922 #define AV_PKT_FLAG_KEY 0x0001 ///< The packet contains a keyframe
923 #define AV_PKT_FLAG_CORRUPT 0x0002 ///< The packet content is corrupted
925 enum AVSideDataParamChangeFlags {
926 AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_COUNT = 0x0001,
927 AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_LAYOUT = 0x0002,
928 AV_SIDE_DATA_PARAM_CHANGE_SAMPLE_RATE = 0x0004,
929 AV_SIDE_DATA_PARAM_CHANGE_DIMENSIONS = 0x0008,
937 * New fields can be added to the end of AVFRAME with minor version
938 * bumps. Similarly fields that are marked as to be only accessed by
939 * av_opt_ptr() can be reordered. This allows 2 forks to add fields
940 * without breaking compatibility with each other.
941 * Removal, reordering and changes in the remaining cases require
942 * a major version bump.
943 * sizeof(AVFrame) must not be used outside libavcodec.
945 typedef struct AVFrame {
946 #define AV_NUM_DATA_POINTERS 8
948 * pointer to the picture/channel planes.
949 * This might be different from the first allocated byte
950 * - encoding: Set by user
951 * - decoding: set by AVCodecContext.get_buffer()
953 uint8_t *data[AV_NUM_DATA_POINTERS];
956 * Size, in bytes, of the data for each picture/channel plane.
958 * For audio, only linesize[0] may be set. For planar audio, each channel
959 * plane must be the same size.
961 * - encoding: Set by user
962 * - decoding: set by AVCodecContext.get_buffer()
964 int linesize[AV_NUM_DATA_POINTERS];
967 * pointers to the data planes/channels.
969 * For video, this should simply point to data[].
971 * For planar audio, each channel has a separate data pointer, and
972 * linesize[0] contains the size of each channel buffer.
973 * For packed audio, there is just one data pointer, and linesize[0]
974 * contains the total size of the buffer for all channels.
976 * Note: Both data and extended_data will always be set by get_buffer(),
977 * but for planar audio with more channels that can fit in data,
978 * extended_data must be used by the decoder in order to access all
982 * decoding: set by AVCodecContext.get_buffer()
984 uint8_t **extended_data;
987 * width and height of the video frame
989 * - decoding: Read by user.
994 * number of audio samples (per channel) described by this frame
995 * - encoding: Set by user
996 * - decoding: Set by libavcodec
1001 * format of the frame, -1 if unknown or unset
1002 * Values correspond to enum PixelFormat for video frames,
1003 * enum AVSampleFormat for audio)
1004 * - encoding: unused
1005 * - decoding: Read by user.
1010 * 1 -> keyframe, 0-> not
1011 * - encoding: Set by libavcodec.
1012 * - decoding: Set by libavcodec.
1017 * Picture type of the frame, see ?_TYPE below.
1018 * - encoding: Set by libavcodec. for coded_picture (and set by user for input).
1019 * - decoding: Set by libavcodec.
1021 enum AVPictureType pict_type;
1024 * pointer to the first allocated byte of the picture. Can be used in get_buffer/release_buffer.
1025 * This isn't used by libavcodec unless the default get/release_buffer() is used.
1029 uint8_t *base[AV_NUM_DATA_POINTERS];
1032 * sample aspect ratio for the video frame, 0/1 if unknown/unspecified
1033 * - encoding: unused
1034 * - decoding: Read by user.
1036 AVRational sample_aspect_ratio;
1039 * presentation timestamp in time_base units (time when frame should be shown to user)
1040 * If AV_NOPTS_VALUE then frame_rate = 1/time_base will be assumed.
1041 * - encoding: MUST be set by user.
1042 * - decoding: Set by libavcodec.
1047 * reordered pts from the last AVPacket that has been input into the decoder
1048 * - encoding: unused
1049 * - decoding: Read by user.
1054 * dts from the last AVPacket that has been input into the decoder
1055 * - encoding: unused
1056 * - decoding: Read by user.
1061 * picture number in bitstream order
1062 * - encoding: set by
1063 * - decoding: Set by libavcodec.
1065 int coded_picture_number;
1067 * picture number in display order
1068 * - encoding: set by
1069 * - decoding: Set by libavcodec.
1071 int display_picture_number;
1074 * quality (between 1 (good) and FF_LAMBDA_MAX (bad))
1075 * - encoding: Set by libavcodec. for coded_picture (and set by user for input).
1076 * - decoding: Set by libavcodec.
1081 * is this picture used as reference
1082 * The values for this are the same as the MpegEncContext.picture_structure
1083 * variable, that is 1->top field, 2->bottom field, 3->frame/both fields.
1084 * Set to 4 for delayed, non-reference frames.
1085 * - encoding: unused
1086 * - decoding: Set by libavcodec. (before get_buffer() call)).
1092 * - encoding: unused
1093 * - decoding: Set by libavcodec.
1095 int8_t *qscale_table;
1098 * - encoding: unused
1099 * - decoding: Set by libavcodec.
1109 * mbskip_table[mb]>=1 if MB didn't change
1110 * stride= mb_width = (width+15)>>4
1111 * - encoding: unused
1112 * - decoding: Set by libavcodec.
1114 uint8_t *mbskip_table;
1117 * motion vector table
1120 * int mv_sample_log2= 4 - motion_subsample_log2;
1121 * int mb_width= (width+15)>>4;
1122 * int mv_stride= (mb_width << mv_sample_log2) + 1;
1123 * motion_val[direction][x + y*mv_stride][0->mv_x, 1->mv_y];
1125 * - encoding: Set by user.
1126 * - decoding: Set by libavcodec.
1128 int16_t (*motion_val[2])[2];
1131 * macroblock type table
1132 * mb_type_base + mb_width + 2
1133 * - encoding: Set by user.
1134 * - decoding: Set by libavcodec.
1140 * - encoding: unused
1141 * - decoding: Set by libavcodec.
1146 * motion reference frame index
1147 * the order in which these are stored can depend on the codec.
1148 * - encoding: Set by user.
1149 * - decoding: Set by libavcodec.
1151 int8_t *ref_index[2];
1154 * for some private data of the user
1155 * - encoding: unused
1156 * - decoding: Set by user.
1162 * - encoding: Set by libavcodec. if flags&CODEC_FLAG_PSNR.
1163 * - decoding: unused
1165 uint64_t error[AV_NUM_DATA_POINTERS];
1168 * type of the buffer (to keep track of who has to deallocate data[*])
1169 * - encoding: Set by the one who allocates it.
1170 * - decoding: Set by the one who allocates it.
1171 * Note: User allocated (direct rendering) & internal buffers cannot coexist currently.
1176 * When decoding, this signals how much the picture must be delayed.
1177 * extra_delay = repeat_pict / (2*fps)
1178 * - encoding: unused
1179 * - decoding: Set by libavcodec.
1184 * The content of the picture is interlaced.
1185 * - encoding: Set by user.
1186 * - decoding: Set by libavcodec. (default 0)
1188 int interlaced_frame;
1191 * If the content is interlaced, is top field displayed first.
1192 * - encoding: Set by user.
1193 * - decoding: Set by libavcodec.
1195 int top_field_first;
1198 * Tell user application that palette has changed from previous frame.
1199 * - encoding: ??? (no palette-enabled encoder yet)
1200 * - decoding: Set by libavcodec. (default 0).
1202 int palette_has_changed;
1205 * codec suggestion on buffer type if != 0
1206 * - encoding: unused
1207 * - decoding: Set by libavcodec. (before get_buffer() call)).
1213 * - encoding: Set by user.
1214 * - decoding: Set by libavcodec.
1216 AVPanScan *pan_scan;
1219 * reordered opaque 64bit (generally an integer or a double precision float
1220 * PTS but can be anything).
1221 * The user sets AVCodecContext.reordered_opaque to represent the input at
1223 * the decoder reorders values as needed and sets AVFrame.reordered_opaque
1224 * to exactly one of the values provided by the user through AVCodecContext.reordered_opaque
1225 * @deprecated in favor of pkt_pts
1226 * - encoding: unused
1227 * - decoding: Read by user.
1229 int64_t reordered_opaque;
1232 * hardware accelerator private data (FFmpeg-allocated)
1233 * - encoding: unused
1234 * - decoding: Set by libavcodec
1236 void *hwaccel_picture_private;
1239 * the AVCodecContext which ff_thread_get_buffer() was last called on
1240 * - encoding: Set by libavcodec.
1241 * - decoding: Set by libavcodec.
1243 struct AVCodecContext *owner;
1246 * used by multithreading to store frame-specific info
1247 * - encoding: Set by libavcodec.
1248 * - decoding: Set by libavcodec.
1250 void *thread_opaque;
1253 * log2 of the size of the block which a single vector in motion_val represents:
1254 * (4->16x16, 3->8x8, 2-> 4x4, 1-> 2x2)
1255 * - encoding: unused
1256 * - decoding: Set by libavcodec.
1258 uint8_t motion_subsample_log2;
1261 * Sample rate of the audio data.
1263 * - encoding: unused
1264 * - decoding: read by user
1269 * Channel layout of the audio data.
1271 * - encoding: unused
1272 * - decoding: read by user.
1274 uint64_t channel_layout;
1277 * frame timestamp estimated using various heuristics, in stream time base
1278 * Code outside libavcodec should access this field using:
1279 * av_frame_get_best_effort_timestamp(frame)
1280 * - encoding: unused
1281 * - decoding: set by libavcodec, read by user.
1283 int64_t best_effort_timestamp;
1286 * reordered pos from the last AVPacket that has been input into the decoder
1287 * Code outside libavcodec should access this field using:
1288 * av_frame_get_pkt_pos(frame)
1289 * - encoding: unused
1290 * - decoding: Read by user.
1295 * duration of the corresponding packet, expressed in
1296 * AVStream->time_base units, 0 if unknown.
1297 * Code outside libavcodec should access this field using:
1298 * av_frame_get_pkt_duration(frame)
1299 * - encoding: unused
1300 * - decoding: Read by user.
1302 int64_t pkt_duration;
1306 * Accessors for some AVFrame fields.
1307 * The position of these field in the structure is not part of the ABI,
1308 * they should not be accessed directly outside libavcodec.
1310 int64_t av_frame_get_best_effort_timestamp(const AVFrame *frame);
1311 int64_t av_frame_get_pkt_duration (const AVFrame *frame);
1312 int64_t av_frame_get_pkt_pos (const AVFrame *frame);
1313 int64_t av_frame_get_channel_layout (const AVFrame *frame);
1314 int av_frame_get_sample_rate (const AVFrame *frame);
1315 void av_frame_set_best_effort_timestamp(AVFrame *frame, int64_t val);
1316 void av_frame_set_pkt_duration (AVFrame *frame, int64_t val);
1317 void av_frame_set_pkt_pos (AVFrame *frame, int64_t val);
1318 void av_frame_set_channel_layout (AVFrame *frame, int64_t val);
1319 void av_frame_set_sample_rate (AVFrame *frame, int val);
1321 struct AVCodecInternal;
1325 AV_FIELD_PROGRESSIVE,
1326 AV_FIELD_TT, //< Top coded_first, top displayed first
1327 AV_FIELD_BB, //< Bottom coded first, bottom displayed first
1328 AV_FIELD_TB, //< Top coded first, bottom displayed first
1329 AV_FIELD_BT, //< Bottom coded first, top displayed first
1333 * main external API structure.
1334 * New fields can be added to the end with minor version bumps.
1335 * Removal, reordering and changes to existing fields require a major
1337 * Please use AVOptions (av_opt* / av_set/get*()) to access these fields from user
1339 * sizeof(AVCodecContext) must not be used outside libav*.
1341 typedef struct AVCodecContext {
1343 * information on struct for av_log
1344 * - set by avcodec_alloc_context3
1346 const AVClass *av_class;
1347 int log_level_offset;
1349 enum AVMediaType codec_type; /* see AVMEDIA_TYPE_xxx */
1350 struct AVCodec *codec;
1351 char codec_name[32];
1352 enum CodecID codec_id; /* see CODEC_ID_xxx */
1355 * fourcc (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A').
1356 * This is used to work around some encoder bugs.
1357 * A demuxer should set this to what is stored in the field used to identify the codec.
1358 * If there are multiple such fields in a container then the demuxer should choose the one
1359 * which maximizes the information about the used codec.
1360 * If the codec tag field in a container is larger than 32 bits then the demuxer should
1361 * remap the longer ID to 32 bits with a table or other structure. Alternatively a new
1362 * extra_codec_tag + size could be added but for this a clear advantage must be demonstrated
1364 * - encoding: Set by user, if not then the default based on codec_id will be used.
1365 * - decoding: Set by user, will be converted to uppercase by libavcodec during init.
1367 unsigned int codec_tag;
1370 * fourcc from the AVI stream header (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A').
1371 * This is used to work around some encoder bugs.
1372 * - encoding: unused
1373 * - decoding: Set by user, will be converted to uppercase by libavcodec during init.
1375 unsigned int stream_codec_tag;
1379 * @deprecated this field is unused
1381 attribute_deprecated int sub_id;
1387 * Private context used for internal data.
1389 * Unlike priv_data, this is not codec-specific. It is used in general
1390 * libavcodec functions.
1392 struct AVCodecInternal *internal;
1395 * Private data of the user, can be used to carry app specific stuff.
1396 * - encoding: Set by user.
1397 * - decoding: Set by user.
1402 * the average bitrate
1403 * - encoding: Set by user; unused for constant quantizer encoding.
1404 * - decoding: Set by libavcodec. 0 or some bitrate if this info is available in the stream.
1409 * number of bits the bitstream is allowed to diverge from the reference.
1410 * the reference can be CBR (for CBR pass1) or VBR (for pass2)
1411 * - encoding: Set by user; unused for constant quantizer encoding.
1412 * - decoding: unused
1414 int bit_rate_tolerance;
1417 * Global quality for codecs which cannot change it per frame.
1418 * This should be proportional to MPEG-1/2/4 qscale.
1419 * - encoding: Set by user.
1420 * - decoding: unused
1425 * - encoding: Set by user.
1426 * - decoding: unused
1428 int compression_level;
1429 #define FF_COMPRESSION_DEFAULT -1
1433 * - encoding: Set by user.
1434 * - decoding: Set by user.
1440 * - encoding: Set by user.
1441 * - decoding: Set by user.
1446 * some codecs need / can use extradata like Huffman tables.
1447 * mjpeg: Huffman tables
1448 * rv10: additional flags
1449 * mpeg4: global headers (they can be in the bitstream or here)
1450 * The allocated memory should be FF_INPUT_BUFFER_PADDING_SIZE bytes larger
1451 * than extradata_size to avoid prolems if it is read with the bitstream reader.
1452 * The bytewise contents of extradata must not depend on the architecture or CPU endianness.
1453 * - encoding: Set/allocated/freed by libavcodec.
1454 * - decoding: Set/allocated/freed by user.
1460 * This is the fundamental unit of time (in seconds) in terms
1461 * of which frame timestamps are represented. For fixed-fps content,
1462 * timebase should be 1/framerate and timestamp increments should be
1464 * - encoding: MUST be set by user.
1465 * - decoding: Set by libavcodec.
1467 AVRational time_base;
1470 * For some codecs, the time base is closer to the field rate than the frame rate.
1471 * Most notably, H.264 and MPEG-2 specify time_base as half of frame duration
1472 * if no telecine is used ...
1474 * Set to time_base ticks per frame. Default 1, e.g., H.264/MPEG-2 set it to 2.
1476 int ticks_per_frame;
1479 * Encoding: Number of frames delay there will be from the encoder input to
1480 * the decoder output. (we assume the decoder matches the spec)
1481 * Decoding: Number of frames delay in addition to what a standard decoder
1482 * as specified in the spec would produce.
1485 * Number of frames the decoded output will be delayed relative to the
1489 * Number of "priming" samples added to the beginning of the stream
1490 * during encoding. The decoded output will be delayed by this many
1491 * samples relative to the input to the encoder. Note that this field is
1492 * purely informational and does not directly affect the pts output by
1493 * the encoder, which should always be based on the actual presentation
1494 * time, including any delay.
1496 * - encoding: Set by libavcodec.
1497 * - decoding: Set by libavcodec.
1504 * picture width / height.
1505 * - encoding: MUST be set by user.
1506 * - decoding: Set by libavcodec.
1507 * Note: For compatibility it is possible to set this instead of
1508 * coded_width/height before decoding.
1513 * Bitstream width / height, may be different from width/height if lowres enabled.
1514 * - encoding: unused
1515 * - decoding: Set by user before init if known. Codec should override / dynamically change if needed.
1517 int coded_width, coded_height;
1519 #define FF_ASPECT_EXTENDED 15
1522 * the number of pictures in a group of pictures, or 0 for intra_only
1523 * - encoding: Set by user.
1524 * - decoding: unused
1529 * Pixel format, see PIX_FMT_xxx.
1530 * May be set by the demuxer if known from headers.
1531 * May be overridden by the decoder if it knows better.
1532 * - encoding: Set by user.
1533 * - decoding: Set by user if known, overridden by libavcodec if known
1535 enum PixelFormat pix_fmt;
1538 * Motion estimation algorithm used for video coding.
1539 * 1 (zero), 2 (full), 3 (log), 4 (phods), 5 (epzs), 6 (x1), 7 (hex),
1540 * 8 (umh), 9 (iter), 10 (tesa) [7, 8, 10 are x264 specific, 9 is snow specific]
1541 * - encoding: MUST be set by user.
1542 * - decoding: unused
1547 * If non NULL, 'draw_horiz_band' is called by the libavcodec
1548 * decoder to draw a horizontal band. It improves cache usage. Not
1549 * all codecs can do that. You must check the codec capabilities
1551 * When multithreading is used, it may be called from multiple threads
1552 * at the same time; threads might draw different parts of the same AVFrame,
1553 * or multiple AVFrames, and there is no guarantee that slices will be drawn
1555 * The function is also used by hardware acceleration APIs.
1556 * It is called at least once during frame decoding to pass
1557 * the data needed for hardware render.
1558 * In that mode instead of pixel data, AVFrame points to
1559 * a structure specific to the acceleration API. The application
1560 * reads the structure and can change some fields to indicate progress
1562 * - encoding: unused
1563 * - decoding: Set by user.
1564 * @param height the height of the slice
1565 * @param y the y position of the slice
1566 * @param type 1->top field, 2->bottom field, 3->frame
1567 * @param offset offset into the AVFrame.data from which the slice should be read
1569 void (*draw_horiz_band)(struct AVCodecContext *s,
1570 const AVFrame *src, int offset[AV_NUM_DATA_POINTERS],
1571 int y, int type, int height);
1574 * callback to negotiate the pixelFormat
1575 * @param fmt is the list of formats which are supported by the codec,
1576 * it is terminated by -1 as 0 is a valid format, the formats are ordered by quality.
1577 * The first is always the native one.
1578 * @return the chosen format
1579 * - encoding: unused
1580 * - decoding: Set by user, if not set the native format will be chosen.
1582 enum PixelFormat (*get_format)(struct AVCodecContext *s, const enum PixelFormat * fmt);
1585 * maximum number of B-frames between non-B-frames
1586 * Note: The output will be delayed by max_b_frames+1 relative to the input.
1587 * - encoding: Set by user.
1588 * - decoding: unused
1593 * qscale factor between IP and B-frames
1594 * If > 0 then the last P-frame quantizer will be used (q= lastp_q*factor+offset).
1595 * If < 0 then normal ratecontrol will be done (q= -normal_q*factor+offset).
1596 * - encoding: Set by user.
1597 * - decoding: unused
1599 float b_quant_factor;
1601 /** obsolete FIXME remove */
1603 #define FF_RC_STRATEGY_XVID 1
1605 int b_frame_strategy;
1607 #if FF_API_MPV_GLOBAL_OPTS
1609 * luma single coefficient elimination threshold
1610 * - encoding: Set by user.
1611 * - decoding: unused
1613 attribute_deprecated int luma_elim_threshold;
1616 * chroma single coeff elimination threshold
1617 * - encoding: Set by user.
1618 * - decoding: unused
1620 attribute_deprecated int chroma_elim_threshold;
1624 * qscale offset between IP and B-frames
1625 * - encoding: Set by user.
1626 * - decoding: unused
1628 float b_quant_offset;
1631 * Size of the frame reordering buffer in the decoder.
1632 * For MPEG-2 it is 1 IPB or 0 low delay IP.
1633 * - encoding: Set by libavcodec.
1634 * - decoding: Set by libavcodec.
1639 * 0-> h263 quant 1-> mpeg quant
1640 * - encoding: Set by user.
1641 * - decoding: unused
1646 * qscale factor between P and I-frames
1647 * If > 0 then the last p frame quantizer will be used (q= lastp_q*factor+offset).
1648 * If < 0 then normal ratecontrol will be done (q= -normal_q*factor+offset).
1649 * - encoding: Set by user.
1650 * - decoding: unused
1652 float i_quant_factor;
1655 * qscale offset between P and I-frames
1656 * - encoding: Set by user.
1657 * - decoding: unused
1659 float i_quant_offset;
1662 * luminance masking (0-> disabled)
1663 * - encoding: Set by user.
1664 * - decoding: unused
1669 * temporary complexity masking (0-> disabled)
1670 * - encoding: Set by user.
1671 * - decoding: unused
1673 float temporal_cplx_masking;
1676 * spatial complexity masking (0-> disabled)
1677 * - encoding: Set by user.
1678 * - decoding: unused
1680 float spatial_cplx_masking;
1683 * p block masking (0-> disabled)
1684 * - encoding: Set by user.
1685 * - decoding: unused
1690 * darkness masking (0-> disabled)
1691 * - encoding: Set by user.
1692 * - decoding: unused
1698 * - encoding: Set by libavcodec.
1699 * - decoding: Set by user (or 0).
1703 * prediction method (needed for huffyuv)
1704 * - encoding: Set by user.
1705 * - decoding: unused
1707 int prediction_method;
1708 #define FF_PRED_LEFT 0
1709 #define FF_PRED_PLANE 1
1710 #define FF_PRED_MEDIAN 2
1713 * slice offsets in the frame in bytes
1714 * - encoding: Set/allocated by libavcodec.
1715 * - decoding: Set/allocated by user (or NULL).
1720 * sample aspect ratio (0 if unknown)
1721 * That is the width of a pixel divided by the height of the pixel.
1722 * Numerator and denominator must be relatively prime and smaller than 256 for some video standards.
1723 * - encoding: Set by user.
1724 * - decoding: Set by libavcodec.
1726 AVRational sample_aspect_ratio;
1729 * motion estimation comparison function
1730 * - encoding: Set by user.
1731 * - decoding: unused
1735 * subpixel motion estimation comparison function
1736 * - encoding: Set by user.
1737 * - decoding: unused
1741 * macroblock comparison function (not supported yet)
1742 * - encoding: Set by user.
1743 * - decoding: unused
1747 * interlaced DCT comparison function
1748 * - encoding: Set by user.
1749 * - decoding: unused
1752 #define FF_CMP_SAD 0
1753 #define FF_CMP_SSE 1
1754 #define FF_CMP_SATD 2
1755 #define FF_CMP_DCT 3
1756 #define FF_CMP_PSNR 4
1757 #define FF_CMP_BIT 5
1759 #define FF_CMP_ZERO 7
1760 #define FF_CMP_VSAD 8
1761 #define FF_CMP_VSSE 9
1762 #define FF_CMP_NSSE 10
1763 #define FF_CMP_W53 11
1764 #define FF_CMP_W97 12
1765 #define FF_CMP_DCTMAX 13
1766 #define FF_CMP_DCT264 14
1767 #define FF_CMP_CHROMA 256
1770 * ME diamond size & shape
1771 * - encoding: Set by user.
1772 * - decoding: unused
1777 * amount of previous MV predictors (2a+1 x 2a+1 square)
1778 * - encoding: Set by user.
1779 * - decoding: unused
1781 int last_predictor_count;
1784 * prepass for motion estimation
1785 * - encoding: Set by user.
1786 * - decoding: unused
1791 * motion estimation prepass comparison function
1792 * - encoding: Set by user.
1793 * - decoding: unused
1798 * ME prepass diamond size & shape
1799 * - encoding: Set by user.
1800 * - decoding: unused
1806 * - encoding: Set by user.
1807 * - decoding: unused
1809 int me_subpel_quality;
1812 * DTG active format information (additional aspect ratio
1813 * information only used in DVB MPEG-2 transport streams)
1816 * - encoding: unused
1817 * - decoding: Set by decoder.
1819 int dtg_active_format;
1820 #define FF_DTG_AFD_SAME 8
1821 #define FF_DTG_AFD_4_3 9
1822 #define FF_DTG_AFD_16_9 10
1823 #define FF_DTG_AFD_14_9 11
1824 #define FF_DTG_AFD_4_3_SP_14_9 13
1825 #define FF_DTG_AFD_16_9_SP_14_9 14
1826 #define FF_DTG_AFD_SP_4_3 15
1829 * maximum motion estimation search range in subpel units
1830 * If 0 then no limit.
1832 * - encoding: Set by user.
1833 * - decoding: unused
1838 * intra quantizer bias
1839 * - encoding: Set by user.
1840 * - decoding: unused
1842 int intra_quant_bias;
1843 #define FF_DEFAULT_QUANT_BIAS 999999
1846 * inter quantizer bias
1847 * - encoding: Set by user.
1848 * - decoding: unused
1850 int inter_quant_bias;
1852 #if FF_API_COLOR_TABLE_ID
1855 * - encoding: unused
1856 * - decoding: Which clrtable should be used for 8bit RGB images.
1857 * Tables have to be stored somewhere. FIXME
1859 attribute_deprecated int color_table_id;
1864 * - encoding: unused
1865 * - decoding: Set by user.
1868 #define SLICE_FLAG_CODED_ORDER 0x0001 ///< draw_horiz_band() is called in coded order instead of display
1869 #define SLICE_FLAG_ALLOW_FIELD 0x0002 ///< allow draw_horiz_band() with field slices (MPEG2 field pics)
1870 #define SLICE_FLAG_ALLOW_PLANE 0x0004 ///< allow draw_horiz_band() with 1 component at a time (SVQ1)
1873 * XVideo Motion Acceleration
1874 * - encoding: forbidden
1875 * - decoding: set by decoder
1877 int xvmc_acceleration;
1880 * macroblock decision mode
1881 * - encoding: Set by user.
1882 * - decoding: unused
1885 #define FF_MB_DECISION_SIMPLE 0 ///< uses mb_cmp
1886 #define FF_MB_DECISION_BITS 1 ///< chooses the one which needs the fewest bits
1887 #define FF_MB_DECISION_RD 2 ///< rate distortion
1890 * custom intra quantization matrix
1891 * - encoding: Set by user, can be NULL.
1892 * - decoding: Set by libavcodec.
1894 uint16_t *intra_matrix;
1897 * custom inter quantization matrix
1898 * - encoding: Set by user, can be NULL.
1899 * - decoding: Set by libavcodec.
1901 uint16_t *inter_matrix;
1904 * scene change detection threshold
1905 * 0 is default, larger means fewer detected scene changes.
1906 * - encoding: Set by user.
1907 * - decoding: unused
1909 int scenechange_threshold;
1912 * noise reduction strength
1913 * - encoding: Set by user.
1914 * - decoding: unused
1916 int noise_reduction;
1918 #if FF_API_INTER_THRESHOLD
1920 * @deprecated this field is unused
1922 attribute_deprecated int inter_threshold;
1925 #if FF_API_MPV_GLOBAL_OPTS
1927 * @deprecated use mpegvideo private options instead
1929 attribute_deprecated int quantizer_noise_shaping;
1933 * Motion estimation threshold below which no motion estimation is
1934 * performed, but instead the user specified motion vectors are used.
1936 * - encoding: Set by user.
1937 * - decoding: unused
1942 * Macroblock threshold below which the user specified macroblock types will be used.
1943 * - encoding: Set by user.
1944 * - decoding: unused
1949 * precision of the intra DC coefficient - 8
1950 * - encoding: Set by user.
1951 * - decoding: unused
1953 int intra_dc_precision;
1956 * Number of macroblock rows at the top which are skipped.
1957 * - encoding: unused
1958 * - decoding: Set by user.
1963 * Number of macroblock rows at the bottom which are skipped.
1964 * - encoding: unused
1965 * - decoding: Set by user.
1970 * Border processing masking, raises the quantizer for mbs on the borders
1972 * - encoding: Set by user.
1973 * - decoding: unused
1975 float border_masking;
1978 * minimum MB lagrange multipler
1979 * - encoding: Set by user.
1980 * - decoding: unused
1985 * maximum MB lagrange multipler
1986 * - encoding: Set by user.
1987 * - decoding: unused
1993 * - encoding: Set by user.
1994 * - decoding: unused
1996 int me_penalty_compensation;
2000 * - encoding: Set by user.
2001 * - decoding: unused
2007 * - encoding: Set by user.
2008 * - decoding: unused
2014 * - encoding: Set by user.
2015 * - decoding: unused
2020 * number of reference frames
2021 * - encoding: Set by user.
2022 * - decoding: Set by lavc.
2027 * chroma qp offset from luma
2028 * - encoding: Set by user.
2029 * - decoding: unused
2034 * Multiplied by qscale for each frame and added to scene_change_score.
2035 * - encoding: Set by user.
2036 * - decoding: unused
2038 int scenechange_factor;
2042 * Note: Value depends upon the compare function used for fullpel ME.
2043 * - encoding: Set by user.
2044 * - decoding: unused
2049 * Adjust sensitivity of b_frame_strategy 1.
2050 * - encoding: Set by user.
2051 * - decoding: unused
2056 * Chromaticity coordinates of the source primaries.
2057 * - encoding: Set by user
2058 * - decoding: Set by libavcodec
2060 enum AVColorPrimaries color_primaries;
2063 * Color Transfer Characteristic.
2064 * - encoding: Set by user
2065 * - decoding: Set by libavcodec
2067 enum AVColorTransferCharacteristic color_trc;
2070 * YUV colorspace type.
2071 * - encoding: Set by user
2072 * - decoding: Set by libavcodec
2074 enum AVColorSpace colorspace;
2077 * MPEG vs JPEG YUV range.
2078 * - encoding: Set by user
2079 * - decoding: Set by libavcodec
2081 enum AVColorRange color_range;
2084 * This defines the location of chroma samples.
2085 * - encoding: Set by user
2086 * - decoding: Set by libavcodec
2088 enum AVChromaLocation chroma_sample_location;
2092 * Indicates number of picture subdivisions. Used for parallelized
2094 * - encoding: Set by user
2095 * - decoding: unused
2100 * - encoding: set by libavcodec
2101 * - decoding: Set by libavcodec
2103 enum AVFieldOrder field_order;
2106 int sample_rate; ///< samples per second
2107 int channels; ///< number of audio channels
2110 * audio sample format
2111 * - encoding: Set by user.
2112 * - decoding: Set by libavcodec.
2114 enum AVSampleFormat sample_fmt; ///< sample format
2116 /* The following data should not be initialized. */
2118 * Samples per packet, initialized when calling 'init'.
2123 * Frame counter, set by libavcodec.
2125 * - decoding: total number of frames returned from the decoder so far.
2126 * - encoding: total number of frames passed to the encoder so far.
2128 * @note the counter is not incremented if encoding/decoding resulted in
2134 * number of bytes per packet if constant and known or 0
2135 * Used by some WAV based audio codecs.
2140 * Audio cutoff bandwidth (0 means "automatic")
2141 * - encoding: Set by user.
2142 * - decoding: unused
2146 #if FF_API_REQUEST_CHANNELS
2148 * Decoder should decode to this many channels if it can (0 for default)
2149 * - encoding: unused
2150 * - decoding: Set by user.
2151 * @deprecated Deprecated in favor of request_channel_layout.
2153 int request_channels;
2157 * Audio channel layout.
2158 * - encoding: set by user.
2159 * - decoding: set by user, may be overwritten by libavcodec.
2161 uint64_t channel_layout;
2164 * Request decoder to use this channel layout if it can (0 for default)
2165 * - encoding: unused
2166 * - decoding: Set by user.
2168 uint64_t request_channel_layout;
2171 * Type of service that the audio stream conveys.
2172 * - encoding: Set by user.
2173 * - decoding: Set by libavcodec.
2175 enum AVAudioServiceType audio_service_type;
2178 * desired sample format
2179 * - encoding: Not used.
2180 * - decoding: Set by user.
2181 * Decoder will decode to this format if it can.
2183 enum AVSampleFormat request_sample_fmt;
2186 * Called at the beginning of each frame to get a buffer for it.
2188 * The function will set AVFrame.data[], AVFrame.linesize[].
2189 * AVFrame.extended_data[] must also be set, but it should be the same as
2190 * AVFrame.data[] except for planar audio with more channels than can fit
2191 * in AVFrame.data[]. In that case, AVFrame.data[] shall still contain as
2192 * many data pointers as it can hold.
2194 * if CODEC_CAP_DR1 is not set then get_buffer() must call
2195 * avcodec_default_get_buffer() instead of providing buffers allocated by
2198 * AVFrame.data[] should be 32- or 16-byte-aligned unless the CPU doesn't
2199 * need it. avcodec_default_get_buffer() aligns the output buffer properly,
2200 * but if get_buffer() is overridden then alignment considerations should
2201 * be taken into account.
2203 * @see avcodec_default_get_buffer()
2207 * If pic.reference is set then the frame will be read later by libavcodec.
2208 * avcodec_align_dimensions2() should be used to find the required width and
2209 * height, as they normally need to be rounded up to the next multiple of 16.
2211 * If frame multithreading is used and thread_safe_callbacks is set,
2212 * it may be called from a different thread, but not from more than one at
2213 * once. Does not need to be reentrant.
2215 * @see release_buffer(), reget_buffer()
2216 * @see avcodec_align_dimensions2()
2220 * Decoders request a buffer of a particular size by setting
2221 * AVFrame.nb_samples prior to calling get_buffer(). The decoder may,
2222 * however, utilize only part of the buffer by setting AVFrame.nb_samples
2223 * to a smaller value in the output frame.
2225 * Decoders cannot use the buffer after returning from
2226 * avcodec_decode_audio4(), so they will not call release_buffer(), as it
2227 * is assumed to be released immediately upon return.
2229 * As a convenience, av_samples_get_buffer_size() and
2230 * av_samples_fill_arrays() in libavutil may be used by custom get_buffer()
2231 * functions to find the required data size and to fill data pointers and
2232 * linesize. In AVFrame.linesize, only linesize[0] may be set for audio
2233 * since all planes must be the same size.
2235 * @see av_samples_get_buffer_size(), av_samples_fill_arrays()
2237 * - encoding: unused
2238 * - decoding: Set by libavcodec, user can override.
2240 int (*get_buffer)(struct AVCodecContext *c, AVFrame *pic);
2243 * Called to release buffers which were allocated with get_buffer.
2244 * A released buffer can be reused in get_buffer().
2245 * pic.data[*] must be set to NULL.
2246 * May be called from a different thread if frame multithreading is used,
2247 * but not by more than one thread at once, so does not need to be reentrant.
2248 * - encoding: unused
2249 * - decoding: Set by libavcodec, user can override.
2251 void (*release_buffer)(struct AVCodecContext *c, AVFrame *pic);
2254 * Called at the beginning of a frame to get cr buffer for it.
2255 * Buffer type (size, hints) must be the same. libavcodec won't check it.
2256 * libavcodec will pass previous buffer in pic, function should return
2257 * same buffer or new buffer with old frame "painted" into it.
2258 * If pic.data[0] == NULL must behave like get_buffer().
2259 * if CODEC_CAP_DR1 is not set then reget_buffer() must call
2260 * avcodec_default_reget_buffer() instead of providing buffers allocated by
2262 * - encoding: unused
2263 * - decoding: Set by libavcodec, user can override.
2265 int (*reget_buffer)(struct AVCodecContext *c, AVFrame *pic);
2268 /* - encoding parameters */
2269 float qcompress; ///< amount of qscale change between easy & hard scenes (0.0-1.0)
2270 float qblur; ///< amount of qscale smoothing over time (0.0-1.0)
2274 * - encoding: Set by user.
2275 * - decoding: unused
2281 * - encoding: Set by user.
2282 * - decoding: unused
2287 * maximum quantizer difference between frames
2288 * - encoding: Set by user.
2289 * - decoding: unused
2294 * ratecontrol qmin qmax limiting method
2295 * 0-> clipping, 1-> use a nice continuous function to limit qscale wthin qmin/qmax.
2296 * - encoding: Set by user.
2297 * - decoding: unused
2305 * decoder bitstream buffer size
2306 * - encoding: Set by user.
2307 * - decoding: unused
2312 * ratecontrol override, see RcOverride
2313 * - encoding: Allocated/set/freed by user.
2314 * - decoding: unused
2316 int rc_override_count;
2317 RcOverride *rc_override;
2320 * rate control equation
2321 * - encoding: Set by user
2322 * - decoding: unused
2328 * - encoding: Set by user.
2329 * - decoding: unused
2335 * - encoding: Set by user.
2336 * - decoding: unused
2340 float rc_buffer_aggressivity;
2343 * initial complexity for pass1 ratecontrol
2344 * - encoding: Set by user.
2345 * - decoding: unused
2347 float rc_initial_cplx;
2350 * Ratecontrol attempt to use, at maximum, <value> of what can be used without an underflow.
2351 * - encoding: Set by user.
2352 * - decoding: unused.
2354 float rc_max_available_vbv_use;
2357 * Ratecontrol attempt to use, at least, <value> times the amount needed to prevent a vbv overflow.
2358 * - encoding: Set by user.
2359 * - decoding: unused.
2361 float rc_min_vbv_overflow_use;
2364 * Number of bits which should be loaded into the rc buffer before decoding starts.
2365 * - encoding: Set by user.
2366 * - decoding: unused
2368 int rc_initial_buffer_occupancy;
2370 #define FF_CODER_TYPE_VLC 0
2371 #define FF_CODER_TYPE_AC 1
2372 #define FF_CODER_TYPE_RAW 2
2373 #define FF_CODER_TYPE_RLE 3
2374 #define FF_CODER_TYPE_DEFLATE 4
2377 * - encoding: Set by user.
2378 * - decoding: unused
2384 * - encoding: Set by user.
2385 * - decoding: unused
2390 * minimum Lagrange multipler
2391 * - encoding: Set by user.
2392 * - decoding: unused
2397 * maximum Lagrange multipler
2398 * - encoding: Set by user.
2399 * - decoding: unused
2404 * frame skip threshold
2405 * - encoding: Set by user.
2406 * - decoding: unused
2408 int frame_skip_threshold;
2412 * - encoding: Set by user.
2413 * - decoding: unused
2415 int frame_skip_factor;
2418 * frame skip exponent
2419 * - encoding: Set by user.
2420 * - decoding: unused
2425 * frame skip comparison function
2426 * - encoding: Set by user.
2427 * - decoding: unused
2432 * trellis RD quantization
2433 * - encoding: Set by user.
2434 * - decoding: unused
2439 * - encoding: Set by user.
2440 * - decoding: unused
2442 int min_prediction_order;
2445 * - encoding: Set by user.
2446 * - decoding: unused
2448 int max_prediction_order;
2451 * GOP timecode frame start number
2452 * - encoding: Set by user, in non drop frame format
2453 * - decoding: Set by libavcodec (timecode in the 25 bits format, -1 if unset)
2455 int64_t timecode_frame_start;
2457 /* The RTP callback: This function is called */
2458 /* every time the encoder has a packet to send. */
2459 /* It depends on the encoder if the data starts */
2460 /* with a Start Code (it should). H.263 does. */
2461 /* mb_nb contains the number of macroblocks */
2462 /* encoded in the RTP payload. */
2463 void (*rtp_callback)(struct AVCodecContext *avctx, void *data, int size, int mb_nb);
2465 int rtp_payload_size; /* The size of the RTP payload: the coder will */
2466 /* do its best to deliver a chunk with size */
2467 /* below rtp_payload_size, the chunk will start */
2468 /* with a start code on some codecs like H.263. */
2469 /* This doesn't take account of any particular */
2470 /* headers inside the transmitted RTP payload. */
2472 /* statistics, used for 2-pass encoding */
2483 * number of bits used for the previously encoded frame
2484 * - encoding: Set by libavcodec.
2485 * - decoding: unused
2490 * pass1 encoding statistics output buffer
2491 * - encoding: Set by libavcodec.
2492 * - decoding: unused
2497 * pass2 encoding statistics input buffer
2498 * Concatenated stuff from stats_out of pass1 should be placed here.
2499 * - encoding: Allocated/set/freed by user.
2500 * - decoding: unused
2505 * Work around bugs in encoders which sometimes cannot be detected automatically.
2506 * - encoding: Set by user
2507 * - decoding: Set by user
2509 int workaround_bugs;
2510 #define FF_BUG_AUTODETECT 1 ///< autodetection
2511 #define FF_BUG_OLD_MSMPEG4 2
2512 #define FF_BUG_XVID_ILACE 4
2513 #define FF_BUG_UMP4 8
2514 #define FF_BUG_NO_PADDING 16
2515 #define FF_BUG_AMV 32
2516 #define FF_BUG_AC_VLC 0 ///< Will be removed, libavcodec can now handle these non-compliant files by default.
2517 #define FF_BUG_QPEL_CHROMA 64
2518 #define FF_BUG_STD_QPEL 128
2519 #define FF_BUG_QPEL_CHROMA2 256
2520 #define FF_BUG_DIRECT_BLOCKSIZE 512
2521 #define FF_BUG_EDGE 1024
2522 #define FF_BUG_HPEL_CHROMA 2048
2523 #define FF_BUG_DC_CLIP 4096
2524 #define FF_BUG_MS 8192 ///< Work around various bugs in Microsoft's broken decoders.
2525 #define FF_BUG_TRUNCATED 16384
2528 * strictly follow the standard (MPEG4, ...).
2529 * - encoding: Set by user.
2530 * - decoding: Set by user.
2531 * Setting this to STRICT or higher means the encoder and decoder will
2532 * generally do stupid things, whereas setting it to unofficial or lower
2533 * will mean the encoder might produce output that is not supported by all
2534 * spec-compliant decoders. Decoders don't differentiate between normal,
2535 * unofficial and experimental (that is, they always try to decode things
2536 * when they can) unless they are explicitly asked to behave stupidly
2537 * (=strictly conform to the specs)
2539 int strict_std_compliance;
2540 #define FF_COMPLIANCE_VERY_STRICT 2 ///< Strictly conform to an older more strict version of the spec or reference software.
2541 #define FF_COMPLIANCE_STRICT 1 ///< Strictly conform to all the things in the spec no matter what consequences.
2542 #define FF_COMPLIANCE_NORMAL 0
2543 #define FF_COMPLIANCE_UNOFFICIAL -1 ///< Allow unofficial extensions
2544 #define FF_COMPLIANCE_EXPERIMENTAL -2 ///< Allow nonstandardized experimental things.
2547 * error concealment flags
2548 * - encoding: unused
2549 * - decoding: Set by user.
2551 int error_concealment;
2552 #define FF_EC_GUESS_MVS 1
2553 #define FF_EC_DEBLOCK 2
2557 * - encoding: Set by user.
2558 * - decoding: Set by user.
2561 #define FF_DEBUG_PICT_INFO 1
2562 #define FF_DEBUG_RC 2
2563 #define FF_DEBUG_BITSTREAM 4
2564 #define FF_DEBUG_MB_TYPE 8
2565 #define FF_DEBUG_QP 16
2566 #define FF_DEBUG_MV 32
2567 #define FF_DEBUG_DCT_COEFF 0x00000040
2568 #define FF_DEBUG_SKIP 0x00000080
2569 #define FF_DEBUG_STARTCODE 0x00000100
2570 #define FF_DEBUG_PTS 0x00000200
2571 #define FF_DEBUG_ER 0x00000400
2572 #define FF_DEBUG_MMCO 0x00000800
2573 #define FF_DEBUG_BUGS 0x00001000
2574 #define FF_DEBUG_VIS_QP 0x00002000
2575 #define FF_DEBUG_VIS_MB_TYPE 0x00004000
2576 #define FF_DEBUG_BUFFERS 0x00008000
2577 #define FF_DEBUG_THREADS 0x00010000
2581 * - encoding: Set by user.
2582 * - decoding: Set by user.
2585 #define FF_DEBUG_VIS_MV_P_FOR 0x00000001 //visualize forward predicted MVs of P frames
2586 #define FF_DEBUG_VIS_MV_B_FOR 0x00000002 //visualize forward predicted MVs of B frames
2587 #define FF_DEBUG_VIS_MV_B_BACK 0x00000004 //visualize backward predicted MVs of B frames
2590 * Error recognition; may misdetect some more or less valid parts as errors.
2591 * - encoding: unused
2592 * - decoding: Set by user.
2594 int err_recognition;
2595 #define AV_EF_CRCCHECK (1<<0)
2596 #define AV_EF_BITSTREAM (1<<1)
2597 #define AV_EF_BUFFER (1<<2)
2598 #define AV_EF_EXPLODE (1<<3)
2600 #define AV_EF_CAREFUL (1<<16)
2601 #define AV_EF_COMPLIANT (1<<17)
2602 #define AV_EF_AGGRESSIVE (1<<18)
2606 * opaque 64bit number (generally a PTS) that will be reordered and
2607 * output in AVFrame.reordered_opaque
2608 * @deprecated in favor of pkt_pts
2609 * - encoding: unused
2610 * - decoding: Set by user.
2612 int64_t reordered_opaque;
2615 * Hardware accelerator in use
2616 * - encoding: unused.
2617 * - decoding: Set by libavcodec
2619 struct AVHWAccel *hwaccel;
2622 * Hardware accelerator context.
2623 * For some hardware accelerators, a global context needs to be
2624 * provided by the user. In that case, this holds display-dependent
2625 * data FFmpeg cannot instantiate itself. Please refer to the
2626 * FFmpeg HW accelerator documentation to know how to fill this
2627 * is. e.g. for VA API, this is a struct vaapi_context.
2628 * - encoding: unused
2629 * - decoding: Set by user
2631 void *hwaccel_context;
2635 * - encoding: Set by libavcodec if flags&CODEC_FLAG_PSNR.
2636 * - decoding: unused
2638 uint64_t error[AV_NUM_DATA_POINTERS];
2641 * DCT algorithm, see FF_DCT_* below
2642 * - encoding: Set by user.
2643 * - decoding: unused
2646 #define FF_DCT_AUTO 0
2647 #define FF_DCT_FASTINT 1
2648 #define FF_DCT_INT 2
2649 #define FF_DCT_MMX 3
2650 #define FF_DCT_ALTIVEC 5
2651 #define FF_DCT_FAAN 6
2654 * IDCT algorithm, see FF_IDCT_* below.
2655 * - encoding: Set by user.
2656 * - decoding: Set by user.
2659 #define FF_IDCT_AUTO 0
2660 #define FF_IDCT_INT 1
2661 #define FF_IDCT_SIMPLE 2
2662 #define FF_IDCT_SIMPLEMMX 3
2663 #define FF_IDCT_LIBMPEG2MMX 4
2664 #define FF_IDCT_MMI 5
2665 #define FF_IDCT_ARM 7
2666 #define FF_IDCT_ALTIVEC 8
2667 #define FF_IDCT_SH4 9
2668 #define FF_IDCT_SIMPLEARM 10
2669 #define FF_IDCT_H264 11
2670 #define FF_IDCT_VP3 12
2671 #define FF_IDCT_IPP 13
2672 #define FF_IDCT_XVIDMMX 14
2673 #define FF_IDCT_CAVS 15
2674 #define FF_IDCT_SIMPLEARMV5TE 16
2675 #define FF_IDCT_SIMPLEARMV6 17
2676 #define FF_IDCT_SIMPLEVIS 18
2677 #define FF_IDCT_WMV2 19
2678 #define FF_IDCT_FAAN 20
2679 #define FF_IDCT_EA 21
2680 #define FF_IDCT_SIMPLENEON 22
2681 #define FF_IDCT_SIMPLEALPHA 23
2682 #define FF_IDCT_BINK 24
2687 * @deprecated use av_set_cpu_flags_mask() instead.
2689 attribute_deprecated unsigned dsp_mask;
2693 * bits per sample/pixel from the demuxer (needed for huffyuv).
2694 * - encoding: Set by libavcodec.
2695 * - decoding: Set by user.
2697 int bits_per_coded_sample;
2700 * Bits per sample/pixel of internal libavcodec pixel/sample format.
2701 * - encoding: set by user.
2702 * - decoding: set by libavcodec.
2704 int bits_per_raw_sample;
2707 * low resolution decoding, 1-> 1/2 size, 2->1/4 size
2708 * - encoding: unused
2709 * - decoding: Set by user.
2714 * the picture in the bitstream
2715 * - encoding: Set by libavcodec.
2716 * - decoding: Set by libavcodec.
2718 AVFrame *coded_frame;
2722 * is used to decide how many independent tasks should be passed to execute()
2723 * - encoding: Set by user.
2724 * - decoding: Set by user.
2729 * Which multithreading methods to use.
2730 * Use of FF_THREAD_FRAME will increase decoding delay by one frame per thread,
2731 * so clients which cannot provide future frames should not use it.
2733 * - encoding: Set by user, otherwise the default is used.
2734 * - decoding: Set by user, otherwise the default is used.
2737 #define FF_THREAD_FRAME 1 ///< Decode more than one frame at once
2738 #define FF_THREAD_SLICE 2 ///< Decode more than one part of a single frame at once
2741 * Which multithreading methods are in use by the codec.
2742 * - encoding: Set by libavcodec.
2743 * - decoding: Set by libavcodec.
2745 int active_thread_type;
2748 * Set by the client if its custom get_buffer() callback can be called
2749 * synchronously from another thread, which allows faster multithreaded decoding.
2750 * draw_horiz_band() will be called from other threads regardless of this setting.
2751 * Ignored if the default get_buffer() is used.
2752 * - encoding: Set by user.
2753 * - decoding: Set by user.
2755 int thread_safe_callbacks;
2758 * The codec may call this to execute several independent things.
2759 * It will return only after finishing all tasks.
2760 * The user may replace this with some multithreaded implementation,
2761 * the default implementation will execute the parts serially.
2762 * @param count the number of things to execute
2763 * - encoding: Set by libavcodec, user can override.
2764 * - decoding: Set by libavcodec, user can override.
2766 int (*execute)(struct AVCodecContext *c, int (*func)(struct AVCodecContext *c2, void *arg), void *arg2, int *ret, int count, int size);
2769 * The codec may call this to execute several independent things.
2770 * It will return only after finishing all tasks.
2771 * The user may replace this with some multithreaded implementation,
2772 * the default implementation will execute the parts serially.
2773 * Also see avcodec_thread_init and e.g. the --enable-pthread configure option.
2774 * @param c context passed also to func
2775 * @param count the number of things to execute
2776 * @param arg2 argument passed unchanged to func
2777 * @param ret return values of executed functions, must have space for "count" values. May be NULL.
2778 * @param func function that will be called count times, with jobnr from 0 to count-1.
2779 * threadnr will be in the range 0 to c->thread_count-1 < MAX_THREADS and so that no
2780 * two instances of func executing at the same time will have the same threadnr.
2781 * @return always 0 currently, but code should handle a future improvement where when any call to func
2782 * returns < 0 no further calls to func may be done and < 0 is returned.
2783 * - encoding: Set by libavcodec, user can override.
2784 * - decoding: Set by libavcodec, user can override.
2786 int (*execute2)(struct AVCodecContext *c, int (*func)(struct AVCodecContext *c2, void *arg, int jobnr, int threadnr), void *arg2, int *ret, int count);
2790 * Can be used by execute() to store some per AVCodecContext stuff.
2791 * - encoding: set by execute()
2792 * - decoding: set by execute()
2794 void *thread_opaque;
2797 * noise vs. sse weight for the nsse comparsion function
2798 * - encoding: Set by user.
2799 * - decoding: unused
2805 * - encoding: Set by user.
2806 * - decoding: Set by libavcodec.
2809 #define FF_PROFILE_UNKNOWN -99
2810 #define FF_PROFILE_RESERVED -100
2812 #define FF_PROFILE_AAC_MAIN 0
2813 #define FF_PROFILE_AAC_LOW 1
2814 #define FF_PROFILE_AAC_SSR 2
2815 #define FF_PROFILE_AAC_LTP 3
2817 #define FF_PROFILE_DTS 20
2818 #define FF_PROFILE_DTS_ES 30
2819 #define FF_PROFILE_DTS_96_24 40
2820 #define FF_PROFILE_DTS_HD_HRA 50
2821 #define FF_PROFILE_DTS_HD_MA 60
2823 #define FF_PROFILE_MPEG2_422 0
2824 #define FF_PROFILE_MPEG2_HIGH 1
2825 #define FF_PROFILE_MPEG2_SS 2
2826 #define FF_PROFILE_MPEG2_SNR_SCALABLE 3
2827 #define FF_PROFILE_MPEG2_MAIN 4
2828 #define FF_PROFILE_MPEG2_SIMPLE 5
2830 #define FF_PROFILE_H264_CONSTRAINED (1<<9) // 8+1; constraint_set1_flag
2831 #define FF_PROFILE_H264_INTRA (1<<11) // 8+3; constraint_set3_flag
2833 #define FF_PROFILE_H264_BASELINE 66
2834 #define FF_PROFILE_H264_CONSTRAINED_BASELINE (66|FF_PROFILE_H264_CONSTRAINED)
2835 #define FF_PROFILE_H264_MAIN 77
2836 #define FF_PROFILE_H264_EXTENDED 88
2837 #define FF_PROFILE_H264_HIGH 100
2838 #define FF_PROFILE_H264_HIGH_10 110
2839 #define FF_PROFILE_H264_HIGH_10_INTRA (110|FF_PROFILE_H264_INTRA)
2840 #define FF_PROFILE_H264_HIGH_422 122
2841 #define FF_PROFILE_H264_HIGH_422_INTRA (122|FF_PROFILE_H264_INTRA)
2842 #define FF_PROFILE_H264_HIGH_444 144
2843 #define FF_PROFILE_H264_HIGH_444_PREDICTIVE 244
2844 #define FF_PROFILE_H264_HIGH_444_INTRA (244|FF_PROFILE_H264_INTRA)
2845 #define FF_PROFILE_H264_CAVLC_444 44
2847 #define FF_PROFILE_VC1_SIMPLE 0
2848 #define FF_PROFILE_VC1_MAIN 1
2849 #define FF_PROFILE_VC1_COMPLEX 2
2850 #define FF_PROFILE_VC1_ADVANCED 3
2852 #define FF_PROFILE_MPEG4_SIMPLE 0
2853 #define FF_PROFILE_MPEG4_SIMPLE_SCALABLE 1
2854 #define FF_PROFILE_MPEG4_CORE 2
2855 #define FF_PROFILE_MPEG4_MAIN 3
2856 #define FF_PROFILE_MPEG4_N_BIT 4
2857 #define FF_PROFILE_MPEG4_SCALABLE_TEXTURE 5
2858 #define FF_PROFILE_MPEG4_SIMPLE_FACE_ANIMATION 6
2859 #define FF_PROFILE_MPEG4_BASIC_ANIMATED_TEXTURE 7
2860 #define FF_PROFILE_MPEG4_HYBRID 8
2861 #define FF_PROFILE_MPEG4_ADVANCED_REAL_TIME 9
2862 #define FF_PROFILE_MPEG4_CORE_SCALABLE 10
2863 #define FF_PROFILE_MPEG4_ADVANCED_CODING 11
2864 #define FF_PROFILE_MPEG4_ADVANCED_CORE 12
2865 #define FF_PROFILE_MPEG4_ADVANCED_SCALABLE_TEXTURE 13
2866 #define FF_PROFILE_MPEG4_SIMPLE_STUDIO 14
2867 #define FF_PROFILE_MPEG4_ADVANCED_SIMPLE 15
2871 * - encoding: Set by user.
2872 * - decoding: Set by libavcodec.
2875 #define FF_LEVEL_UNKNOWN -99
2879 * - encoding: unused
2880 * - decoding: Set by user.
2882 enum AVDiscard skip_loop_filter;
2886 * - encoding: unused
2887 * - decoding: Set by user.
2889 enum AVDiscard skip_idct;
2893 * - encoding: unused
2894 * - decoding: Set by user.
2896 enum AVDiscard skip_frame;
2899 * Header containing style information for text subtitles.
2900 * For SUBTITLE_ASS subtitle type, it should contain the whole ASS
2901 * [Script Info] and [V4+ Styles] section, plus the [Events] line and
2902 * the Format line following. It shouldn't include any Dialogue line.
2903 * - encoding: Set/allocated/freed by user (before avcodec_open2())
2904 * - decoding: Set/allocated/freed by libavcodec (by avcodec_open2())
2906 uint8_t *subtitle_header;
2907 int subtitle_header_size;
2910 * Simulates errors in the bitstream to test error concealment.
2911 * - encoding: Set by user.
2912 * - decoding: unused
2917 * Current packet as passed into the decoder, to avoid having
2918 * to pass the packet into every function. Currently only valid
2919 * inside lavc and get/release_buffer callbacks.
2920 * - decoding: set by avcodec_decode_*, read by get_buffer() for setting pkt_pts
2921 * - encoding: unused
2926 * VBV delay coded in the last frame (in periods of a 27 MHz clock).
2927 * Used for compliant TS muxing.
2928 * - encoding: Set by libavcodec.
2929 * - decoding: unused.
2934 * Current statistics for PTS correction.
2935 * - decoding: maintained and used by libavcodec, not intended to be used by user apps
2936 * - encoding: unused
2938 int64_t pts_correction_num_faulty_pts; /// Number of incorrect PTS values so far
2939 int64_t pts_correction_num_faulty_dts; /// Number of incorrect DTS values so far
2940 int64_t pts_correction_last_pts; /// PTS of the last frame
2941 int64_t pts_correction_last_dts; /// DTS of the last frame
2947 typedef struct AVProfile {
2949 const char *name; ///< short name for the profile
2952 typedef struct AVCodecDefault AVCodecDefault;
2957 typedef struct AVCodec {
2959 * Name of the codec implementation.
2960 * The name is globally unique among encoders and among decoders (but an
2961 * encoder and a decoder can share the same name).
2962 * This is the primary way to find a codec from the user perspective.
2966 * Descriptive name for the codec, meant to be more human readable than name.
2967 * You should use the NULL_IF_CONFIG_SMALL() macro to define it.
2969 const char *long_name;
2970 enum AVMediaType type;
2973 * Codec capabilities.
2977 const AVRational *supported_framerates; ///< array of supported framerates, or NULL if any, array is terminated by {0,0}
2978 const enum PixelFormat *pix_fmts; ///< array of supported pixel formats, or NULL if unknown, array is terminated by -1
2979 const int *supported_samplerates; ///< array of supported audio samplerates, or NULL if unknown, array is terminated by 0
2980 const enum AVSampleFormat *sample_fmts; ///< array of supported sample formats, or NULL if unknown, array is terminated by -1
2981 const uint64_t *channel_layouts; ///< array of support channel layouts, or NULL if unknown. array is terminated by 0
2982 uint8_t max_lowres; ///< maximum value for lowres supported by the decoder
2983 const AVClass *priv_class; ///< AVClass for the private context
2984 const AVProfile *profiles; ///< array of recognized profiles, or NULL if unknown, array is terminated by {FF_PROFILE_UNKNOWN}
2986 /*****************************************************************
2987 * No fields below this line are part of the public API. They
2988 * may not be used outside of libavcodec and can be changed and
2990 * New public fields should be added right above.
2991 *****************************************************************
2994 struct AVCodec *next;
2996 * @name Frame-level threading support functions
3000 * If defined, called on thread contexts when they are created.
3001 * If the codec allocates writable tables in init(), re-allocate them here.
3002 * priv_data will be set to a copy of the original.
3004 int (*init_thread_copy)(AVCodecContext *);
3006 * Copy necessary context variables from a previous thread context to the current one.
3007 * If not defined, the next thread will start automatically; otherwise, the codec
3008 * must call ff_thread_finish_setup().
3010 * dst and src will (rarely) point to the same context, in which case memcpy should be skipped.
3012 int (*update_thread_context)(AVCodecContext *dst, const AVCodecContext *src);
3016 * Private codec-specific defaults.
3018 const AVCodecDefault *defaults;
3021 * Initialize codec static data, called from avcodec_register().
3023 void (*init_static_data)(struct AVCodec *codec);
3025 int (*init)(AVCodecContext *);
3026 int (*encode)(AVCodecContext *, uint8_t *buf, int buf_size, void *data);
3028 * Encode data to an AVPacket.
3030 * @param avctx codec context
3031 * @param avpkt output AVPacket (may contain a user-provided buffer)
3032 * @param[in] frame AVFrame containing the raw data to be encoded
3033 * @param[out] got_packet_ptr encoder sets to 0 or 1 to indicate that a
3034 * non-empty packet was returned in avpkt.
3035 * @return 0 on success, negative error code on failure
3037 int (*encode2)(AVCodecContext *avctx, AVPacket *avpkt, const AVFrame *frame,
3038 int *got_packet_ptr);
3039 int (*decode)(AVCodecContext *, void *outdata, int *outdata_size, AVPacket *avpkt);
3040 int (*close)(AVCodecContext *);
3043 * Will be called when seeking
3045 void (*flush)(AVCodecContext *);
3051 typedef struct AVHWAccel {
3053 * Name of the hardware accelerated codec.
3054 * The name is globally unique among encoders and among decoders (but an
3055 * encoder and a decoder can share the same name).
3060 * Type of codec implemented by the hardware accelerator.
3062 * See AVMEDIA_TYPE_xxx
3064 enum AVMediaType type;
3067 * Codec implemented by the hardware accelerator.
3074 * Supported pixel format.
3076 * Only hardware accelerated formats are supported here.
3078 enum PixelFormat pix_fmt;
3081 * Hardware accelerated codec capabilities.
3082 * see FF_HWACCEL_CODEC_CAP_*
3086 struct AVHWAccel *next;
3089 * Called at the beginning of each frame or field picture.
3091 * Meaningful frame information (codec specific) is guaranteed to
3092 * be parsed at this point. This function is mandatory.
3094 * Note that buf can be NULL along with buf_size set to 0.
3095 * Otherwise, this means the whole frame is available at this point.
3097 * @param avctx the codec context
3098 * @param buf the frame data buffer base
3099 * @param buf_size the size of the frame in bytes
3100 * @return zero if successful, a negative value otherwise
3102 int (*start_frame)(AVCodecContext *avctx, const uint8_t *buf, uint32_t buf_size);
3105 * Callback for each slice.
3107 * Meaningful slice information (codec specific) is guaranteed to
3108 * be parsed at this point. This function is mandatory.
3110 * @param avctx the codec context
3111 * @param buf the slice data buffer base
3112 * @param buf_size the size of the slice in bytes
3113 * @return zero if successful, a negative value otherwise
3115 int (*decode_slice)(AVCodecContext *avctx, const uint8_t *buf, uint32_t buf_size);
3118 * Called at the end of each frame or field picture.
3120 * The whole picture is parsed at this point and can now be sent
3121 * to the hardware accelerator. This function is mandatory.
3123 * @param avctx the codec context
3124 * @return zero if successful, a negative value otherwise
3126 int (*end_frame)(AVCodecContext *avctx);
3129 * Size of HW accelerator private data.
3131 * Private data is allocated with av_mallocz() before
3132 * AVCodecContext.get_buffer() and deallocated after
3133 * AVCodecContext.release_buffer().
3139 * @defgroup lavc_picture AVPicture
3141 * Functions for working with AVPicture
3146 * four components are given, that's all.
3147 * the last component is alpha
3149 typedef struct AVPicture {
3150 uint8_t *data[AV_NUM_DATA_POINTERS];
3151 int linesize[AV_NUM_DATA_POINTERS]; ///< number of bytes per line
3158 enum AVSubtitleType {
3161 SUBTITLE_BITMAP, ///< A bitmap, pict will be set
3164 * Plain text, the text field must be set by the decoder and is
3165 * authoritative. ass and pict fields may contain approximations.
3170 * Formatted text, the ass field must be set by the decoder and is
3171 * authoritative. pict and text fields may contain approximations.
3176 typedef struct AVSubtitleRect {
3177 int x; ///< top left corner of pict, undefined when pict is not set
3178 int y; ///< top left corner of pict, undefined when pict is not set
3179 int w; ///< width of pict, undefined when pict is not set
3180 int h; ///< height of pict, undefined when pict is not set
3181 int nb_colors; ///< number of colors in pict, undefined when pict is not set
3184 * data+linesize for the bitmap of this subtitle.
3185 * can be set for text/ass as well once they where rendered
3188 enum AVSubtitleType type;
3190 char *text; ///< 0 terminated plain UTF-8 text
3193 * 0 terminated ASS/SSA compatible event line.
3194 * The presentation of this is unaffected by the other values in this
3200 * 1 indicates this subtitle is a forced subtitle.
3201 * A forced subtitle should be displayed even when subtitles are hidden.
3206 typedef struct AVSubtitle {
3207 uint16_t format; /* 0 = graphics */
3208 uint32_t start_display_time; /* relative to packet pts, in ms */
3209 uint32_t end_display_time; /* relative to packet pts, in ms */
3211 AVSubtitleRect **rects;
3212 int64_t pts; ///< Same as packet pts, in AV_TIME_BASE
3216 * If c is NULL, returns the first registered codec,
3217 * if c is non-NULL, returns the next registered codec after c,
3218 * or NULL if c is the last one.
3220 AVCodec *av_codec_next(AVCodec *c);
3223 * Return the LIBAVCODEC_VERSION_INT constant.
3225 unsigned avcodec_version(void);
3228 * Return the libavcodec build-time configuration.
3230 const char *avcodec_configuration(void);
3233 * Return the libavcodec license.
3235 const char *avcodec_license(void);
3238 * Register the codec codec and initialize libavcodec.
3240 * @warning either this function or avcodec_register_all() must be called
3241 * before any other libavcodec functions.
3243 * @see avcodec_register_all()
3245 void avcodec_register(AVCodec *codec);
3248 * Register all the codecs, parsers and bitstream filters which were enabled at
3249 * configuration time. If you do not call this function you can select exactly
3250 * which formats you want to support, by using the individual registration
3253 * @see avcodec_register
3254 * @see av_register_codec_parser
3255 * @see av_register_bitstream_filter
3257 void avcodec_register_all(void);
3260 #if FF_API_ALLOC_CONTEXT
3262 * Allocate an AVCodecContext and set its fields to default values. The
3263 * resulting struct can be deallocated by simply calling av_free().
3265 * @return An AVCodecContext filled with default values or NULL on failure.
3266 * @see avcodec_get_context_defaults
3268 * @deprecated use avcodec_alloc_context3()
3270 attribute_deprecated
3271 AVCodecContext *avcodec_alloc_context(void);
3273 /** THIS FUNCTION IS NOT YET PART OF THE PUBLIC API!
3274 * we WILL change its arguments and name a few times! */
3275 attribute_deprecated
3276 AVCodecContext *avcodec_alloc_context2(enum AVMediaType);
3279 * Set the fields of the given AVCodecContext to default values.
3281 * @param s The AVCodecContext of which the fields should be set to default values.
3282 * @deprecated use avcodec_get_context_defaults3
3284 attribute_deprecated
3285 void avcodec_get_context_defaults(AVCodecContext *s);
3287 /** THIS FUNCTION IS NOT YET PART OF THE PUBLIC API!
3288 * we WILL change its arguments and name a few times! */
3289 attribute_deprecated
3290 void avcodec_get_context_defaults2(AVCodecContext *s, enum AVMediaType);
3294 * Allocate an AVCodecContext and set its fields to default values. The
3295 * resulting struct can be deallocated by calling avcodec_close() on it followed
3298 * @param codec if non-NULL, allocate private data and initialize defaults
3299 * for the given codec. It is illegal to then call avcodec_open2()
3300 * with a different codec.
3301 * If NULL, then the codec-specific defaults won't be initialized,
3302 * which may result in suboptimal default settings (this is
3303 * important mainly for encoders, e.g. libx264).
3305 * @return An AVCodecContext filled with default values or NULL on failure.
3306 * @see avcodec_get_context_defaults
3308 AVCodecContext *avcodec_alloc_context3(AVCodec *codec);
3311 * Set the fields of the given AVCodecContext to default values corresponding
3312 * to the given codec (defaults may be codec-dependent).
3314 * Do not call this function if a non-NULL codec has been passed
3315 * to avcodec_alloc_context3() that allocated this AVCodecContext.
3316 * If codec is non-NULL, it is illegal to call avcodec_open2() with a
3317 * different codec on this AVCodecContext.
3319 int avcodec_get_context_defaults3(AVCodecContext *s, AVCodec *codec);
3322 * Get the AVClass for AVCodecContext. It can be used in combination with
3323 * AV_OPT_SEARCH_FAKE_OBJ for examining options.
3325 * @see av_opt_find().
3327 const AVClass *avcodec_get_class(void);
3330 * Get the AVClass for AVFrame. It can be used in combination with
3331 * AV_OPT_SEARCH_FAKE_OBJ for examining options.
3333 * @see av_opt_find().
3335 const AVClass *avcodec_get_frame_class(void);
3338 * Get the AVClass for AVSubtitleRect. It can be used in combination with
3339 * AV_OPT_SEARCH_FAKE_OBJ for examining options.
3341 * @see av_opt_find().
3343 const AVClass *avcodec_get_subtitle_rect_class(void);
3346 * Copy the settings of the source AVCodecContext into the destination
3347 * AVCodecContext. The resulting destination codec context will be
3348 * unopened, i.e. you are required to call avcodec_open2() before you
3349 * can use this AVCodecContext to decode/encode video/audio data.
3351 * @param dest target codec context, should be initialized with
3352 * avcodec_alloc_context3(), but otherwise uninitialized
3353 * @param src source codec context
3354 * @return AVERROR() on error (e.g. memory allocation error), 0 on success
3356 int avcodec_copy_context(AVCodecContext *dest, const AVCodecContext *src);
3359 * Allocate an AVFrame and set its fields to default values. The resulting
3360 * struct can be deallocated by simply calling av_free().
3362 * @return An AVFrame filled with default values or NULL on failure.
3363 * @see avcodec_get_frame_defaults
3365 AVFrame *avcodec_alloc_frame(void);
3368 * Set the fields of the given AVFrame to default values.
3370 * @param pic The AVFrame of which the fields should be set to default values.
3372 void avcodec_get_frame_defaults(AVFrame *pic);
3374 #if FF_API_AVCODEC_OPEN
3376 * Initialize the AVCodecContext to use the given AVCodec. Prior to using this
3377 * function the context has to be allocated.
3379 * The functions avcodec_find_decoder_by_name(), avcodec_find_encoder_by_name(),
3380 * avcodec_find_decoder() and avcodec_find_encoder() provide an easy way for
3381 * retrieving a codec.
3383 * @warning This function is not thread safe!
3386 * avcodec_register_all();
3387 * codec = avcodec_find_decoder(CODEC_ID_H264);
3391 * context = avcodec_alloc_context3(codec);
3393 * if (avcodec_open(context, codec) < 0)
3397 * @param avctx The context which will be set up to use the given codec.
3398 * @param codec The codec to use within the context.
3399 * @return zero on success, a negative value on error
3400 * @see avcodec_alloc_context3, avcodec_find_decoder, avcodec_find_encoder, avcodec_close
3402 * @deprecated use avcodec_open2
3404 attribute_deprecated
3405 int avcodec_open(AVCodecContext *avctx, AVCodec *codec);
3409 * Initialize the AVCodecContext to use the given AVCodec. Prior to using this
3410 * function the context has to be allocated with avcodec_alloc_context3().
3412 * The functions avcodec_find_decoder_by_name(), avcodec_find_encoder_by_name(),
3413 * avcodec_find_decoder() and avcodec_find_encoder() provide an easy way for
3414 * retrieving a codec.
3416 * @warning This function is not thread safe!
3419 * avcodec_register_all();
3420 * av_dict_set(&opts, "b", "2.5M", 0);
3421 * codec = avcodec_find_decoder(CODEC_ID_H264);
3425 * context = avcodec_alloc_context3(codec);
3427 * if (avcodec_open2(context, codec, opts) < 0)
3431 * @param avctx The context to initialize.
3432 * @param codec The codec to open this context for. If a non-NULL codec has been
3433 * previously passed to avcodec_alloc_context3() or
3434 * avcodec_get_context_defaults3() for this context, then this
3435 * parameter MUST be either NULL or equal to the previously passed
3437 * @param options A dictionary filled with AVCodecContext and codec-private options.
3438 * On return this object will be filled with options that were not found.
3440 * @return zero on success, a negative value on error
3441 * @see avcodec_alloc_context3(), avcodec_find_decoder(), avcodec_find_encoder(),
3442 * av_dict_set(), av_opt_find().
3444 int avcodec_open2(AVCodecContext *avctx, AVCodec *codec, AVDictionary **options);
3447 * Close a given AVCodecContext and free all the data associated with it
3448 * (but not the AVCodecContext itself).
3450 * Calling this function on an AVCodecContext that hasn't been opened will free
3451 * the codec-specific data allocated in avcodec_alloc_context3() /
3452 * avcodec_get_context_defaults3() with a non-NULL codec. Subsequent calls will
3455 int avcodec_close(AVCodecContext *avctx);
3458 * Free all allocated data in the given subtitle struct.
3460 * @param sub AVSubtitle to free.
3462 void avsubtitle_free(AVSubtitle *sub);
3469 * @addtogroup lavc_packet
3474 * @deprecated use NULL instead
3476 attribute_deprecated void av_destruct_packet_nofree(AVPacket *pkt);
3479 * Default packet destructor.
3481 void av_destruct_packet(AVPacket *pkt);
3484 * Initialize optional fields of a packet with default values.
3486 * Note, this does not touch the data and size members, which have to be
3487 * initialized separately.
3491 void av_init_packet(AVPacket *pkt);
3494 * Allocate the payload of a packet and initialize its fields with
3498 * @param size wanted payload size
3499 * @return 0 if OK, AVERROR_xxx otherwise
3501 int av_new_packet(AVPacket *pkt, int size);
3504 * Reduce packet size, correctly zeroing padding
3507 * @param size new size
3509 void av_shrink_packet(AVPacket *pkt, int size);
3512 * Increase packet size, correctly zeroing padding
3515 * @param grow_by number of bytes by which to increase the size of the packet
3517 int av_grow_packet(AVPacket *pkt, int grow_by);
3520 * @warning This is a hack - the packet memory allocation stuff is broken. The
3521 * packet is allocated if it was not really allocated.
3523 int av_dup_packet(AVPacket *pkt);
3528 * @param pkt packet to free
3530 void av_free_packet(AVPacket *pkt);
3533 * Allocate new information of a packet.
3536 * @param type side information type
3537 * @param size side information size
3538 * @return pointer to fresh allocated data or NULL otherwise
3540 uint8_t* av_packet_new_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
3544 * Shrink the already allocated side data buffer
3547 * @param type side information type
3548 * @param size new side information size
3549 * @return 0 on success, < 0 on failure
3551 int av_packet_shrink_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
3555 * Get side information from packet.
3558 * @param type desired side information type
3559 * @param size pointer for side information size to store (optional)
3560 * @return pointer to data if present or NULL otherwise
3562 uint8_t* av_packet_get_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
3565 int av_packet_merge_side_data(AVPacket *pkt);
3567 int av_packet_split_side_data(AVPacket *pkt);
3575 * @addtogroup lavc_decoding
3580 * Find a registered decoder with a matching codec ID.
3582 * @param id CodecID of the requested decoder
3583 * @return A decoder if one was found, NULL otherwise.
3585 AVCodec *avcodec_find_decoder(enum CodecID id);
3588 * Find a registered decoder with the specified name.
3590 * @param name name of the requested decoder
3591 * @return A decoder if one was found, NULL otherwise.
3593 AVCodec *avcodec_find_decoder_by_name(const char *name);
3595 int avcodec_default_get_buffer(AVCodecContext *s, AVFrame *pic);
3596 void avcodec_default_release_buffer(AVCodecContext *s, AVFrame *pic);
3597 int avcodec_default_reget_buffer(AVCodecContext *s, AVFrame *pic);
3600 * Return the amount of padding in pixels which the get_buffer callback must
3601 * provide around the edge of the image for codecs which do not have the
3602 * CODEC_FLAG_EMU_EDGE flag.
3604 * @return Required padding in pixels.
3606 unsigned avcodec_get_edge_width(void);
3609 * Modify width and height values so that they will result in a memory
3610 * buffer that is acceptable for the codec if you do not use any horizontal
3613 * May only be used if a codec with CODEC_CAP_DR1 has been opened.
3614 * If CODEC_FLAG_EMU_EDGE is not set, the dimensions must have been increased
3615 * according to avcodec_get_edge_width() before.
3617 void avcodec_align_dimensions(AVCodecContext *s, int *width, int *height);
3620 * Modify width and height values so that they will result in a memory
3621 * buffer that is acceptable for the codec if you also ensure that all
3622 * line sizes are a multiple of the respective linesize_align[i].
3624 * May only be used if a codec with CODEC_CAP_DR1 has been opened.
3625 * If CODEC_FLAG_EMU_EDGE is not set, the dimensions must have been increased
3626 * according to avcodec_get_edge_width() before.
3628 void avcodec_align_dimensions2(AVCodecContext *s, int *width, int *height,
3629 int linesize_align[AV_NUM_DATA_POINTERS]);
3631 #if FF_API_OLD_DECODE_AUDIO
3633 * Wrapper function which calls avcodec_decode_audio4.
3635 * @deprecated Use avcodec_decode_audio4 instead.
3637 * Decode the audio frame of size avpkt->size from avpkt->data into samples.
3638 * Some decoders may support multiple frames in a single AVPacket, such
3639 * decoders would then just decode the first frame. In this case,
3640 * avcodec_decode_audio3 has to be called again with an AVPacket that contains
3641 * the remaining data in order to decode the second frame etc.
3643 * could be outputted, frame_size_ptr is zero. Otherwise, it is the
3644 * decompressed frame size in bytes.
3646 * @warning You must set frame_size_ptr to the allocated size of the
3647 * output buffer before calling avcodec_decode_audio3().
3649 * @warning The input buffer must be FF_INPUT_BUFFER_PADDING_SIZE larger than
3650 * the actual read bytes because some optimized bitstream readers read 32 or 64
3651 * bits at once and could read over the end.
3653 * @warning The end of the input buffer avpkt->data should be set to 0 to ensure that
3654 * no overreading happens for damaged MPEG streams.
3656 * @warning You must not provide a custom get_buffer() when using
3657 * avcodec_decode_audio3(). Doing so will override it with
3658 * avcodec_default_get_buffer. Use avcodec_decode_audio4() instead,
3659 * which does allow the application to provide a custom get_buffer().
3661 * @note You might have to align the input buffer avpkt->data and output buffer
3662 * samples. The alignment requirements depend on the CPU: On some CPUs it isn't
3663 * necessary at all, on others it won't work at all if not aligned and on others
3664 * it will work but it will have an impact on performance.
3666 * In practice, avpkt->data should have 4 byte alignment at minimum and
3667 * samples should be 16 byte aligned unless the CPU doesn't need it
3668 * (AltiVec and SSE do).
3670 * @note Codecs which have the CODEC_CAP_DELAY capability set have a delay
3671 * between input and output, these need to be fed with avpkt->data=NULL,
3672 * avpkt->size=0 at the end to return the remaining frames.
3674 * @param avctx the codec context
3675 * @param[out] samples the output buffer, sample type in avctx->sample_fmt
3676 * If the sample format is planar, each channel plane will
3677 * be the same size, with no padding between channels.
3678 * @param[in,out] frame_size_ptr the output buffer size in bytes
3679 * @param[in] avpkt The input AVPacket containing the input buffer.
3680 * You can create such packet with av_init_packet() and by then setting
3681 * data and size, some decoders might in addition need other fields.
3682 * All decoders are designed to use the least fields possible though.
3683 * @return On error a negative value is returned, otherwise the number of bytes
3684 * used or zero if no frame data was decompressed (used) from the input AVPacket.
3686 attribute_deprecated int avcodec_decode_audio3(AVCodecContext *avctx, int16_t *samples,
3687 int *frame_size_ptr,
3692 * Decode the audio frame of size avpkt->size from avpkt->data into frame.
3694 * Some decoders may support multiple frames in a single AVPacket. Such
3695 * decoders would then just decode the first frame. In this case,
3696 * avcodec_decode_audio4 has to be called again with an AVPacket containing
3697 * the remaining data in order to decode the second frame, etc...
3698 * Even if no frames are returned, the packet needs to be fed to the decoder
3699 * with remaining data until it is completely consumed or an error occurs.
3701 * @warning The input buffer, avpkt->data must be FF_INPUT_BUFFER_PADDING_SIZE
3702 * larger than the actual read bytes because some optimized bitstream
3703 * readers read 32 or 64 bits at once and could read over the end.
3705 * @note You might have to align the input buffer. The alignment requirements
3706 * depend on the CPU and the decoder.
3708 * @param avctx the codec context
3709 * @param[out] frame The AVFrame in which to store decoded audio samples.
3710 * Decoders request a buffer of a particular size by setting
3711 * AVFrame.nb_samples prior to calling get_buffer(). The
3712 * decoder may, however, only utilize part of the buffer by
3713 * setting AVFrame.nb_samples to a smaller value in the
3715 * @param[out] got_frame_ptr Zero if no frame could be decoded, otherwise it is
3717 * @param[in] avpkt The input AVPacket containing the input buffer.
3718 * At least avpkt->data and avpkt->size should be set. Some
3719 * decoders might also require additional fields to be set.
3720 * @return A negative error code is returned if an error occurred during
3721 * decoding, otherwise the number of bytes consumed from the input
3722 * AVPacket is returned.
3724 int avcodec_decode_audio4(AVCodecContext *avctx, AVFrame *frame,
3725 int *got_frame_ptr, const AVPacket *avpkt);
3728 * Decode the video frame of size avpkt->size from avpkt->data into picture.
3729 * Some decoders may support multiple frames in a single AVPacket, such
3730 * decoders would then just decode the first frame.
3732 * @warning The input buffer must be FF_INPUT_BUFFER_PADDING_SIZE larger than
3733 * the actual read bytes because some optimized bitstream readers read 32 or 64
3734 * bits at once and could read over the end.
3736 * @warning The end of the input buffer buf should be set to 0 to ensure that
3737 * no overreading happens for damaged MPEG streams.
3739 * @note You might have to align the input buffer avpkt->data.
3740 * The alignment requirements depend on the CPU: on some CPUs it isn't
3741 * necessary at all, on others it won't work at all if not aligned and on others
3742 * it will work but it will have an impact on performance.
3744 * In practice, avpkt->data should have 4 byte alignment at minimum.
3746 * @note Codecs which have the CODEC_CAP_DELAY capability set have a delay
3747 * between input and output, these need to be fed with avpkt->data=NULL,
3748 * avpkt->size=0 at the end to return the remaining frames.
3750 * @param avctx the codec context
3751 * @param[out] picture The AVFrame in which the decoded video frame will be stored.
3752 * Use avcodec_alloc_frame to get an AVFrame, the codec will
3753 * allocate memory for the actual bitmap.
3754 * with default get/release_buffer(), the decoder frees/reuses the bitmap as it sees fit.
3755 * with overridden get/release_buffer() (needs CODEC_CAP_DR1) the user decides into what buffer the decoder
3756 * decodes and the decoder tells the user once it does not need the data anymore,
3757 * the user app can at this point free/reuse/keep the memory as it sees fit.
3759 * @param[in] avpkt The input AVpacket containing the input buffer.
3760 * You can create such packet with av_init_packet() and by then setting
3761 * data and size, some decoders might in addition need other fields like
3762 * flags&AV_PKT_FLAG_KEY. All decoders are designed to use the least
3764 * @param[in,out] got_picture_ptr Zero if no frame could be decompressed, otherwise, it is nonzero.
3765 * @return On error a negative value is returned, otherwise the number of bytes
3766 * used or zero if no frame could be decompressed.
3768 int avcodec_decode_video2(AVCodecContext *avctx, AVFrame *picture,
3769 int *got_picture_ptr,
3770 const AVPacket *avpkt);
3773 * Decode a subtitle message.
3774 * Return a negative value on error, otherwise return the number of bytes used.
3775 * If no subtitle could be decompressed, got_sub_ptr is zero.
3776 * Otherwise, the subtitle is stored in *sub.
3777 * Note that CODEC_CAP_DR1 is not available for subtitle codecs. This is for
3778 * simplicity, because the performance difference is expect to be negligible
3779 * and reusing a get_buffer written for video codecs would probably perform badly
3780 * due to a potentially very different allocation pattern.
3782 * @param avctx the codec context
3783 * @param[out] sub The AVSubtitle in which the decoded subtitle will be stored, must be
3784 freed with avsubtitle_free if *got_sub_ptr is set.
3785 * @param[in,out] got_sub_ptr Zero if no subtitle could be decompressed, otherwise, it is nonzero.
3786 * @param[in] avpkt The input AVPacket containing the input buffer.
3788 int avcodec_decode_subtitle2(AVCodecContext *avctx, AVSubtitle *sub,
3793 * @defgroup lavc_parsing Frame parsing
3797 typedef struct AVCodecParserContext {
3799 struct AVCodecParser *parser;
3800 int64_t frame_offset; /* offset of the current frame */
3801 int64_t cur_offset; /* current offset
3802 (incremented by each av_parser_parse()) */
3803 int64_t next_frame_offset; /* offset of the next frame */
3805 int pict_type; /* XXX: Put it back in AVCodecContext. */
3807 * This field is used for proper frame duration computation in lavf.
3808 * It signals, how much longer the frame duration of the current frame
3809 * is compared to normal frame duration.
3811 * frame_duration = (1 + repeat_pict) * time_base
3813 * It is used by codecs like H.264 to display telecined material.
3815 int repeat_pict; /* XXX: Put it back in AVCodecContext. */
3816 int64_t pts; /* pts of the current frame */
3817 int64_t dts; /* dts of the current frame */
3822 int fetch_timestamp;
3824 #define AV_PARSER_PTS_NB 4
3825 int cur_frame_start_index;
3826 int64_t cur_frame_offset[AV_PARSER_PTS_NB];
3827 int64_t cur_frame_pts[AV_PARSER_PTS_NB];
3828 int64_t cur_frame_dts[AV_PARSER_PTS_NB];
3831 #define PARSER_FLAG_COMPLETE_FRAMES 0x0001
3832 #define PARSER_FLAG_ONCE 0x0002
3833 /// Set if the parser has a valid file offset
3834 #define PARSER_FLAG_FETCHED_OFFSET 0x0004
3835 #define PARSER_FLAG_USE_CODEC_TS 0x1000
3837 int64_t offset; ///< byte offset from starting packet start
3838 int64_t cur_frame_end[AV_PARSER_PTS_NB];
3841 * Set by parser to 1 for key frames and 0 for non-key frames.
3842 * It is initialized to -1, so if the parser doesn't set this flag,
3843 * old-style fallback using AV_PICTURE_TYPE_I picture type as key frames
3849 * Time difference in stream time base units from the pts of this
3850 * packet to the point at which the output from the decoder has converged
3851 * independent from the availability of previous frames. That is, the
3852 * frames are virtually identical no matter if decoding started from
3853 * the very first frame or from this keyframe.
3854 * Is AV_NOPTS_VALUE if unknown.
3855 * This field is not the display duration of the current frame.
3856 * This field has no meaning if the packet does not have AV_PKT_FLAG_KEY
3859 * The purpose of this field is to allow seeking in streams that have no
3860 * keyframes in the conventional sense. It corresponds to the
3861 * recovery point SEI in H.264 and match_time_delta in NUT. It is also
3862 * essential for some types of subtitle streams to ensure that all
3863 * subtitles are correctly displayed after seeking.
3865 int64_t convergence_duration;
3867 // Timestamp generation support:
3869 * Synchronization point for start of timestamp generation.
3871 * Set to >0 for sync point, 0 for no sync point and <0 for undefined
3874 * For example, this corresponds to presence of H.264 buffering period
3880 * Offset of the current timestamp against last timestamp sync point in
3881 * units of AVCodecContext.time_base.
3883 * Set to INT_MIN when dts_sync_point unused. Otherwise, it must
3884 * contain a valid timestamp offset.
3886 * Note that the timestamp of sync point has usually a nonzero
3887 * dts_ref_dts_delta, which refers to the previous sync point. Offset of
3888 * the next frame after timestamp sync point will be usually 1.
3890 * For example, this corresponds to H.264 cpb_removal_delay.
3892 int dts_ref_dts_delta;
3895 * Presentation delay of current frame in units of AVCodecContext.time_base.
3897 * Set to INT_MIN when dts_sync_point unused. Otherwise, it must
3898 * contain valid non-negative timestamp delta (presentation time of a frame
3899 * must not lie in the past).
3901 * This delay represents the difference between decoding and presentation
3902 * time of the frame.
3904 * For example, this corresponds to H.264 dpb_output_delay.
3909 * Position of the packet in file.
3911 * Analogous to cur_frame_pts/dts
3913 int64_t cur_frame_pos[AV_PARSER_PTS_NB];
3916 * Byte position of currently parsed frame in stream.
3921 * Previous frame byte position.
3926 * Duration of the current frame.
3927 * For audio, this is in units of 1 / AVCodecContext.sample_rate.
3928 * For all other types, this is in units of AVCodecContext.time_base.
3931 } AVCodecParserContext;
3933 typedef struct AVCodecParser {
3934 int codec_ids[5]; /* several codec IDs are permitted */
3936 int (*parser_init)(AVCodecParserContext *s);
3937 int (*parser_parse)(AVCodecParserContext *s,
3938 AVCodecContext *avctx,
3939 const uint8_t **poutbuf, int *poutbuf_size,
3940 const uint8_t *buf, int buf_size);
3941 void (*parser_close)(AVCodecParserContext *s);
3942 int (*split)(AVCodecContext *avctx, const uint8_t *buf, int buf_size);
3943 struct AVCodecParser *next;
3946 AVCodecParser *av_parser_next(AVCodecParser *c);
3948 void av_register_codec_parser(AVCodecParser *parser);
3949 AVCodecParserContext *av_parser_init(int codec_id);
3954 * @param s parser context.
3955 * @param avctx codec context.
3956 * @param poutbuf set to pointer to parsed buffer or NULL if not yet finished.
3957 * @param poutbuf_size set to size of parsed buffer or zero if not yet finished.
3958 * @param buf input buffer.
3959 * @param buf_size input length, to signal EOF, this should be 0 (so that the last frame can be output).
3960 * @param pts input presentation timestamp.
3961 * @param dts input decoding timestamp.
3962 * @param pos input byte position in stream.
3963 * @return the number of bytes of the input bitstream used.
3968 * len = av_parser_parse2(myparser, AVCodecContext, &data, &size,
3975 * decode_frame(data, size);
3979 int av_parser_parse2(AVCodecParserContext *s,
3980 AVCodecContext *avctx,
3981 uint8_t **poutbuf, int *poutbuf_size,
3982 const uint8_t *buf, int buf_size,
3983 int64_t pts, int64_t dts,
3986 int av_parser_change(AVCodecParserContext *s,
3987 AVCodecContext *avctx,
3988 uint8_t **poutbuf, int *poutbuf_size,
3989 const uint8_t *buf, int buf_size, int keyframe);
3990 void av_parser_close(AVCodecParserContext *s);
3998 * @addtogroup lavc_encoding
4003 * Find a registered encoder with a matching codec ID.
4005 * @param id CodecID of the requested encoder
4006 * @return An encoder if one was found, NULL otherwise.
4008 AVCodec *avcodec_find_encoder(enum CodecID id);
4011 * Find a registered encoder with the specified name.
4013 * @param name name of the requested encoder
4014 * @return An encoder if one was found, NULL otherwise.
4016 AVCodec *avcodec_find_encoder_by_name(const char *name);
4018 #if FF_API_OLD_ENCODE_AUDIO
4020 * Encode an audio frame from samples into buf.
4022 * @deprecated Use avcodec_encode_audio2 instead.
4024 * @note The output buffer should be at least FF_MIN_BUFFER_SIZE bytes large.
4025 * However, for codecs with avctx->frame_size equal to 0 (e.g. PCM) the user
4026 * will know how much space is needed because it depends on the value passed
4027 * in buf_size as described below. In that case a lower value can be used.
4029 * @param avctx the codec context
4030 * @param[out] buf the output buffer
4031 * @param[in] buf_size the output buffer size
4032 * @param[in] samples the input buffer containing the samples
4033 * The number of samples read from this buffer is frame_size*channels,
4034 * both of which are defined in avctx.
4035 * For codecs which have avctx->frame_size equal to 0 (e.g. PCM) the number of
4036 * samples read from samples is equal to:
4037 * buf_size * 8 / (avctx->channels * av_get_bits_per_sample(avctx->codec_id))
4038 * This also implies that av_get_bits_per_sample() must not return 0 for these
4040 * @return On error a negative value is returned, on success zero or the number
4041 * of bytes used to encode the data read from the input buffer.
4043 int attribute_deprecated avcodec_encode_audio(AVCodecContext *avctx,
4044 uint8_t *buf, int buf_size,
4045 const short *samples);
4049 * Encode a frame of audio.
4051 * Takes input samples from frame and writes the next output packet, if
4052 * available, to avpkt. The output packet does not necessarily contain data for
4053 * the most recent frame, as encoders can delay, split, and combine input frames
4054 * internally as needed.
4056 * @param avctx codec context
4057 * @param avpkt output AVPacket.
4058 * The user can supply an output buffer by setting
4059 * avpkt->data and avpkt->size prior to calling the
4060 * function, but if the size of the user-provided data is not
4061 * large enough, encoding will fail. If avpkt->data and
4062 * avpkt->size are set, avpkt->destruct must also be set. All
4063 * other AVPacket fields will be reset by the encoder using
4064 * av_init_packet(). If avpkt->data is NULL, the encoder will
4065 * allocate it. The encoder will set avpkt->size to the size
4066 * of the output packet.
4068 * If this function fails or produces no output, avpkt will be
4069 * freed using av_free_packet() (i.e. avpkt->destruct will be
4070 * called to free the user supplied buffer).
4071 * @param[in] frame AVFrame containing the raw audio data to be encoded.
4072 * May be NULL when flushing an encoder that has the
4073 * CODEC_CAP_DELAY capability set.
4074 * If CODEC_CAP_VARIABLE_FRAME_SIZE is set, then each frame
4075 * can have any number of samples.
4076 * If it is not set, frame->nb_samples must be equal to
4077 * avctx->frame_size for all frames except the last.
4078 * The final frame may be smaller than avctx->frame_size.
4079 * @param[out] got_packet_ptr This field is set to 1 by libavcodec if the
4080 * output packet is non-empty, and to 0 if it is
4081 * empty. If the function returns an error, the
4082 * packet can be assumed to be invalid, and the
4083 * value of got_packet_ptr is undefined and should
4085 * @return 0 on success, negative error code on failure
4087 int avcodec_encode_audio2(AVCodecContext *avctx, AVPacket *avpkt,
4088 const AVFrame *frame, int *got_packet_ptr);
4090 #if FF_API_OLD_ENCODE_VIDEO
4092 * @deprecated use avcodec_encode_video2() instead.
4094 * Encode a video frame from pict into buf.
4095 * The input picture should be
4096 * stored using a specific format, namely avctx.pix_fmt.
4098 * @param avctx the codec context
4099 * @param[out] buf the output buffer for the bitstream of encoded frame
4100 * @param[in] buf_size the size of the output buffer in bytes
4101 * @param[in] pict the input picture to encode
4102 * @return On error a negative value is returned, on success zero or the number
4103 * of bytes used from the output buffer.
4105 attribute_deprecated
4106 int avcodec_encode_video(AVCodecContext *avctx, uint8_t *buf, int buf_size,
4107 const AVFrame *pict);
4111 * Encode a frame of video.
4113 * Takes input raw video data from frame and writes the next output packet, if
4114 * available, to avpkt. The output packet does not necessarily contain data for
4115 * the most recent frame, as encoders can delay and reorder input frames
4116 * internally as needed.
4118 * @param avctx codec context
4119 * @param avpkt output AVPacket.
4120 * The user can supply an output buffer by setting
4121 * avpkt->data and avpkt->size prior to calling the
4122 * function, but if the size of the user-provided data is not
4123 * large enough, encoding will fail. All other AVPacket fields
4124 * will be reset by the encoder using av_init_packet(). If
4125 * avpkt->data is NULL, the encoder will allocate it.
4126 * The encoder will set avpkt->size to the size of the
4127 * output packet. The returned data (if any) belongs to the
4128 * caller, he is responsible for freeing it.
4130 * If this function fails or produces no output, avpkt will be
4131 * freed using av_free_packet() (i.e. avpkt->destruct will be
4132 * called to free the user supplied buffer).
4133 * @param[in] frame AVFrame containing the raw video data to be encoded.
4134 * May be NULL when flushing an encoder that has the
4135 * CODEC_CAP_DELAY capability set.
4136 * @param[out] got_packet_ptr This field is set to 1 by libavcodec if the
4137 * output packet is non-empty, and to 0 if it is
4138 * empty. If the function returns an error, the
4139 * packet can be assumed to be invalid, and the
4140 * value of got_packet_ptr is undefined and should
4142 * @return 0 on success, negative error code on failure
4144 int avcodec_encode_video2(AVCodecContext *avctx, AVPacket *avpkt,
4145 const AVFrame *frame, int *got_packet_ptr);
4147 int avcodec_encode_subtitle(AVCodecContext *avctx, uint8_t *buf, int buf_size,
4148 const AVSubtitle *sub);
4156 * @defgroup lavc_resample Audio resampling
4161 struct ReSampleContext;
4162 struct AVResampleContext;
4164 typedef struct ReSampleContext ReSampleContext;
4167 * Initialize audio resampling context.
4169 * @param output_channels number of output channels
4170 * @param input_channels number of input channels
4171 * @param output_rate output sample rate
4172 * @param input_rate input sample rate
4173 * @param sample_fmt_out requested output sample format
4174 * @param sample_fmt_in input sample format
4175 * @param filter_length length of each FIR filter in the filterbank relative to the cutoff frequency
4176 * @param log2_phase_count log2 of the number of entries in the polyphase filterbank
4177 * @param linear if 1 then the used FIR filter will be linearly interpolated
4178 between the 2 closest, if 0 the closest will be used
4179 * @param cutoff cutoff frequency, 1.0 corresponds to half the output sampling rate
4180 * @return allocated ReSampleContext, NULL if error occurred
4182 ReSampleContext *av_audio_resample_init(int output_channels, int input_channels,
4183 int output_rate, int input_rate,
4184 enum AVSampleFormat sample_fmt_out,
4185 enum AVSampleFormat sample_fmt_in,
4186 int filter_length, int log2_phase_count,
4187 int linear, double cutoff);
4189 int audio_resample(ReSampleContext *s, short *output, short *input, int nb_samples);
4192 * Free resample context.
4194 * @param s a non-NULL pointer to a resample context previously
4195 * created with av_audio_resample_init()
4197 void audio_resample_close(ReSampleContext *s);
4201 * Initialize an audio resampler.
4202 * Note, if either rate is not an integer then simply scale both rates up so they are.
4203 * @param filter_length length of each FIR filter in the filterbank relative to the cutoff freq
4204 * @param log2_phase_count log2 of the number of entries in the polyphase filterbank
4205 * @param linear If 1 then the used FIR filter will be linearly interpolated
4206 between the 2 closest, if 0 the closest will be used
4207 * @param cutoff cutoff frequency, 1.0 corresponds to half the output sampling rate
4209 struct AVResampleContext *av_resample_init(int out_rate, int in_rate, int filter_length, int log2_phase_count, int linear, double cutoff);
4212 * Resample an array of samples using a previously configured context.
4213 * @param src an array of unconsumed samples
4214 * @param consumed the number of samples of src which have been consumed are returned here
4215 * @param src_size the number of unconsumed samples available
4216 * @param dst_size the amount of space in samples available in dst
4217 * @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.
4218 * @return the number of samples written in dst or -1 if an error occurred
4220 int av_resample(struct AVResampleContext *c, short *dst, short *src, int *consumed, int src_size, int dst_size, int update_ctx);
4224 * Compensate samplerate/timestamp drift. The compensation is done by changing
4225 * the resampler parameters, so no audible clicks or similar distortions occur
4226 * @param compensation_distance distance in output samples over which the compensation should be performed
4227 * @param sample_delta number of output samples which should be output less
4229 * example: av_resample_compensate(c, 10, 500)
4230 * here instead of 510 samples only 500 samples would be output
4232 * note, due to rounding the actual compensation might be slightly different,
4233 * especially if the compensation_distance is large and the in_rate used during init is small
4235 void av_resample_compensate(struct AVResampleContext *c, int sample_delta, int compensation_distance);
4236 void av_resample_close(struct AVResampleContext *c);
4243 * @addtogroup lavc_picture
4248 * Allocate memory for a picture. Call avpicture_free() to free it.
4250 * @see avpicture_fill()
4252 * @param picture the picture to be filled in
4253 * @param pix_fmt the format of the picture
4254 * @param width the width of the picture
4255 * @param height the height of the picture
4256 * @return zero if successful, a negative value if not
4258 int avpicture_alloc(AVPicture *picture, enum PixelFormat pix_fmt, int width, int height);
4261 * Free a picture previously allocated by avpicture_alloc().
4262 * The data buffer used by the AVPicture is freed, but the AVPicture structure
4265 * @param picture the AVPicture to be freed
4267 void avpicture_free(AVPicture *picture);
4270 * Fill in the AVPicture fields, always assume a linesize alignment of
4273 * @see av_image_fill_arrays()
4275 int avpicture_fill(AVPicture *picture, uint8_t *ptr,
4276 enum PixelFormat pix_fmt, int width, int height);
4279 * Copy pixel data from an AVPicture into a buffer, always assume a
4280 * linesize alignment of 1.
4282 * @see av_image_copy_to_buffer()
4284 int avpicture_layout(const AVPicture* src, enum PixelFormat pix_fmt, int width, int height,
4285 unsigned char *dest, int dest_size);
4288 * Calculate the size in bytes that a picture of the given width and height
4289 * would occupy if stored in the given picture format.
4290 * Always assume a linesize alignment of 1.
4292 * @see av_image_get_buffer_size().
4294 int avpicture_get_size(enum PixelFormat pix_fmt, int width, int height);
4297 * deinterlace - if not supported return -1
4299 int avpicture_deinterlace(AVPicture *dst, const AVPicture *src,
4300 enum PixelFormat pix_fmt, int width, int height);
4302 * Copy image src to dst. Wraps av_image_copy().
4304 void av_picture_copy(AVPicture *dst, const AVPicture *src,
4305 enum PixelFormat pix_fmt, int width, int height);
4308 * Crop image top and left side.
4310 int av_picture_crop(AVPicture *dst, const AVPicture *src,
4311 enum PixelFormat pix_fmt, int top_band, int left_band);
4316 int av_picture_pad(AVPicture *dst, const AVPicture *src, int height, int width, enum PixelFormat pix_fmt,
4317 int padtop, int padbottom, int padleft, int padright, int *color);
4324 * @defgroup lavc_misc Utility functions
4327 * Miscellaneous utility functions related to both encoding and decoding
4333 * @defgroup lavc_misc_pixfmt Pixel formats
4335 * Functions for working with pixel formats.
4339 void avcodec_get_chroma_sub_sample(enum PixelFormat pix_fmt, int *h_shift, int *v_shift);
4342 * Return a value representing the fourCC code associated to the
4343 * pixel format pix_fmt, or 0 if no associated fourCC code can be
4346 unsigned int avcodec_pix_fmt_to_codec_tag(enum PixelFormat pix_fmt);
4348 #define FF_LOSS_RESOLUTION 0x0001 /**< loss due to resolution change */
4349 #define FF_LOSS_DEPTH 0x0002 /**< loss due to color depth change */
4350 #define FF_LOSS_COLORSPACE 0x0004 /**< loss due to color space conversion */
4351 #define FF_LOSS_ALPHA 0x0008 /**< loss of alpha bits */
4352 #define FF_LOSS_COLORQUANT 0x0010 /**< loss due to color quantization */
4353 #define FF_LOSS_CHROMA 0x0020 /**< loss of chroma (e.g. RGB to gray conversion) */
4356 * Compute what kind of losses will occur when converting from one specific
4357 * pixel format to another.
4358 * When converting from one pixel format to another, information loss may occur.
4359 * For example, when converting from RGB24 to GRAY, the color information will
4360 * be lost. Similarly, other losses occur when converting from some formats to
4361 * other formats. These losses can involve loss of chroma, but also loss of
4362 * resolution, loss of color depth, loss due to the color space conversion, loss
4363 * of the alpha bits or loss due to color quantization.
4364 * avcodec_get_fix_fmt_loss() informs you about the various types of losses
4365 * which will occur when converting from one pixel format to another.
4367 * @param[in] dst_pix_fmt destination pixel format
4368 * @param[in] src_pix_fmt source pixel format
4369 * @param[in] has_alpha Whether the source pixel format alpha channel is used.
4370 * @return Combination of flags informing you what kind of losses will occur
4371 * (maximum loss for an invalid dst_pix_fmt).
4373 int avcodec_get_pix_fmt_loss(enum PixelFormat dst_pix_fmt, enum PixelFormat src_pix_fmt,
4377 * Find the best pixel format to convert to given a certain source pixel
4378 * format. When converting from one pixel format to another, information loss
4379 * may occur. For example, when converting from RGB24 to GRAY, the color
4380 * information will be lost. Similarly, other losses occur when converting from
4381 * some formats to other formats. avcodec_find_best_pix_fmt() searches which of
4382 * the given pixel formats should be used to suffer the least amount of loss.
4383 * The pixel formats from which it chooses one, are determined by the
4384 * pix_fmt_mask parameter.
4386 * Note, only the first 64 pixel formats will fit in pix_fmt_mask.
4389 * src_pix_fmt = PIX_FMT_YUV420P;
4390 * pix_fmt_mask = (1 << PIX_FMT_YUV422P) | (1 << PIX_FMT_RGB24);
4391 * dst_pix_fmt = avcodec_find_best_pix_fmt(pix_fmt_mask, src_pix_fmt, alpha, &loss);
4394 * @param[in] pix_fmt_mask bitmask determining which pixel format to choose from
4395 * @param[in] src_pix_fmt source pixel format
4396 * @param[in] has_alpha Whether the source pixel format alpha channel is used.
4397 * @param[out] loss_ptr Combination of flags informing you what kind of losses will occur.
4398 * @return The best pixel format to convert to or -1 if none was found.
4400 enum PixelFormat avcodec_find_best_pix_fmt(int64_t pix_fmt_mask, enum PixelFormat src_pix_fmt,
4401 int has_alpha, int *loss_ptr);
4404 * Find the best pixel format to convert to given a certain source pixel
4405 * format and a selection of two destination pixel formats. When converting from
4406 * one pixel format to another, information loss may occur. For example, when converting
4407 * from RGB24 to GRAY, the color information will be lost. Similarly, other losses occur when
4408 * converting from some formats to other formats. avcodec_find_best_pix_fmt2() selects which of
4409 * the given pixel formats should be used to suffer the least amount of loss.
4411 * If one of the destination formats is PIX_FMT_NONE the other pixel format (if valid) will be
4415 * src_pix_fmt = PIX_FMT_YUV420P;
4416 * dst_pix_fmt1= PIX_FMT_RGB24;
4417 * dst_pix_fmt2= PIX_FMT_GRAY8;
4418 * dst_pix_fmt3= PIX_FMT_RGB8;
4419 * loss= FF_LOSS_CHROMA; // don't care about chroma loss, so chroma loss will be ignored.
4420 * dst_pix_fmt = avcodec_find_best_pix_fmt2(dst_pix_fmt1, dst_pix_fmt2, src_pix_fmt, alpha, &loss);
4421 * dst_pix_fmt = avcodec_find_best_pix_fmt2(dst_pix_fmt, dst_pix_fmt3, src_pix_fmt, alpha, &loss);
4424 * @param[in] dst_pix_fmt1 One of the two destination pixel formats to choose from
4425 * @param[in] dst_pix_fmt2 The other of the two destination pixel formats to choose from
4426 * @param[in] src_pix_fmt Source pixel format
4427 * @param[in] has_alpha Whether the source pixel format alpha channel is used.
4428 * @param[in, out] loss_ptr Combination of loss flags. In: selects which of the losses to ignore, i.e.
4429 * NULL or value of zero means we care about all losses. Out: the loss
4430 * that occurs when converting from src to selected dst pixel format.
4431 * @return The best pixel format to convert to or -1 if none was found.
4433 enum PixelFormat avcodec_find_best_pix_fmt2(enum PixelFormat dst_pix_fmt1, enum PixelFormat dst_pix_fmt2,
4434 enum PixelFormat src_pix_fmt, int has_alpha, int *loss_ptr);
4436 enum PixelFormat avcodec_default_get_format(struct AVCodecContext *s, const enum PixelFormat * fmt);
4442 void avcodec_set_dimensions(AVCodecContext *s, int width, int height);
4445 * Put a string representing the codec tag codec_tag in buf.
4447 * @param buf_size size in bytes of buf
4448 * @return the length of the string that would have been generated if
4449 * enough space had been available, excluding the trailing null
4451 size_t av_get_codec_tag_string(char *buf, size_t buf_size, unsigned int codec_tag);
4453 void avcodec_string(char *buf, int buf_size, AVCodecContext *enc, int encode);
4456 * Return a name for the specified profile, if available.
4458 * @param codec the codec that is searched for the given profile
4459 * @param profile the profile value for which a name is requested
4460 * @return A name for the profile if found, NULL otherwise.
4462 const char *av_get_profile_name(const AVCodec *codec, int profile);
4464 int avcodec_default_execute(AVCodecContext *c, int (*func)(AVCodecContext *c2, void *arg2),void *arg, int *ret, int count, int size);
4465 int avcodec_default_execute2(AVCodecContext *c, int (*func)(AVCodecContext *c2, void *arg2, int, int),void *arg, int *ret, int count);
4466 //FIXME func typedef
4469 * Fill audio frame data and linesize.
4470 * AVFrame extended_data channel pointers are allocated if necessary for
4473 * @param frame the AVFrame
4474 * frame->nb_samples must be set prior to calling the
4475 * function. This function fills in frame->data,
4476 * frame->extended_data, frame->linesize[0].
4477 * @param nb_channels channel count
4478 * @param sample_fmt sample format
4479 * @param buf buffer to use for frame data
4480 * @param buf_size size of buffer
4481 * @param align plane size sample alignment (0 = default)
4482 * @return 0 on success, negative error code on failure
4484 int avcodec_fill_audio_frame(AVFrame *frame, int nb_channels,
4485 enum AVSampleFormat sample_fmt, const uint8_t *buf,
4486 int buf_size, int align);
4489 * Flush buffers, should be called when seeking or when switching to a different stream.
4491 void avcodec_flush_buffers(AVCodecContext *avctx);
4493 void avcodec_default_free_buffers(AVCodecContext *s);
4496 * Return codec bits per sample.
4498 * @param[in] codec_id the codec
4499 * @return Number of bits per sample or zero if unknown for the given codec.
4501 int av_get_bits_per_sample(enum CodecID codec_id);
4504 * Return the PCM codec associated with a sample format.
4505 * @param be endianness, 0 for little, 1 for big,
4506 * -1 (or anything else) for native
4507 * @return CODEC_ID_PCM_* or CODEC_ID_NONE
4509 enum CodecID av_get_pcm_codec(enum AVSampleFormat fmt, int be);
4512 * Return codec bits per sample.
4513 * Only return non-zero if the bits per sample is exactly correct, not an
4516 * @param[in] codec_id the codec
4517 * @return Number of bits per sample or zero if unknown for the given codec.
4519 int av_get_exact_bits_per_sample(enum CodecID codec_id);
4522 * Return audio frame duration.
4524 * @param avctx codec context
4525 * @param frame_bytes size of the frame, or 0 if unknown
4526 * @return frame duration, in samples, if known. 0 if not able to
4529 int av_get_audio_frame_duration(AVCodecContext *avctx, int frame_bytes);
4532 typedef struct AVBitStreamFilterContext {
4534 struct AVBitStreamFilter *filter;
4535 AVCodecParserContext *parser;
4536 struct AVBitStreamFilterContext *next;
4537 } AVBitStreamFilterContext;
4540 typedef struct AVBitStreamFilter {
4543 int (*filter)(AVBitStreamFilterContext *bsfc,
4544 AVCodecContext *avctx, const char *args,
4545 uint8_t **poutbuf, int *poutbuf_size,
4546 const uint8_t *buf, int buf_size, int keyframe);
4547 void (*close)(AVBitStreamFilterContext *bsfc);
4548 struct AVBitStreamFilter *next;
4549 } AVBitStreamFilter;
4551 void av_register_bitstream_filter(AVBitStreamFilter *bsf);
4552 AVBitStreamFilterContext *av_bitstream_filter_init(const char *name);
4553 int av_bitstream_filter_filter(AVBitStreamFilterContext *bsfc,
4554 AVCodecContext *avctx, const char *args,
4555 uint8_t **poutbuf, int *poutbuf_size,
4556 const uint8_t *buf, int buf_size, int keyframe);
4557 void av_bitstream_filter_close(AVBitStreamFilterContext *bsf);
4559 AVBitStreamFilter *av_bitstream_filter_next(AVBitStreamFilter *f);
4564 * Reallocate the given block if it is not large enough, otherwise do nothing.
4568 void *av_fast_realloc(void *ptr, unsigned int *size, size_t min_size);
4571 * Allocate a buffer, reusing the given one if large enough.
4573 * Contrary to av_fast_realloc the current buffer contents might not be
4574 * preserved and on error the old buffer is freed, thus no special
4575 * handling to avoid memleaks is necessary.
4577 * @param ptr pointer to pointer to already allocated buffer, overwritten with pointer to new buffer
4578 * @param size size of the buffer *ptr points to
4579 * @param min_size minimum size of *ptr buffer after returning, *ptr will be NULL and
4580 * *size 0 if an error occurred.
4582 void av_fast_malloc(void *ptr, unsigned int *size, size_t min_size);
4585 * Same behaviour av_fast_malloc but the buffer has additional
4586 * FF_INPUT_PADDING_SIZE at the end which will will always be 0.
4588 * In addition the whole buffer will initially and after resizes
4589 * be 0-initialized so that no uninitialized data will ever appear.
4591 void av_fast_padded_malloc(void *ptr, unsigned int *size, size_t min_size);
4594 * Encode extradata length to a buffer. Used by xiph codecs.
4596 * @param s buffer to write to; must be at least (v/255+1) bytes long
4597 * @param v size of extradata in bytes
4598 * @return number of bytes written to the buffer.
4600 unsigned int av_xiphlacing(unsigned char *s, unsigned int v);
4603 * Log a generic warning message about a missing feature. This function is
4604 * intended to be used internally by FFmpeg (libavcodec, libavformat, etc.)
4605 * only, and would normally not be used by applications.
4606 * @param[in] avc a pointer to an arbitrary struct of which the first field is
4607 * a pointer to an AVClass struct
4608 * @param[in] feature string containing the name of the missing feature
4609 * @param[in] want_sample indicates if samples are wanted which exhibit this feature.
4610 * If want_sample is non-zero, additional verbage will be added to the log
4611 * message which tells the user how to report samples to the development
4614 void av_log_missing_feature(void *avc, const char *feature, int want_sample);
4617 * Log a generic warning message asking for a sample. This function is
4618 * intended to be used internally by FFmpeg (libavcodec, libavformat, etc.)
4619 * only, and would normally not be used by applications.
4620 * @param[in] avc a pointer to an arbitrary struct of which the first field is
4621 * a pointer to an AVClass struct
4622 * @param[in] msg string containing an optional message, or NULL if no message
4624 void av_log_ask_for_sample(void *avc, const char *msg, ...) av_printf_format(2, 3);
4627 * Register the hardware accelerator hwaccel.
4629 void av_register_hwaccel(AVHWAccel *hwaccel);
4632 * If hwaccel is NULL, returns the first registered hardware accelerator,
4633 * if hwaccel is non-NULL, returns the next registered hardware accelerator
4634 * after hwaccel, or NULL if hwaccel is the last one.
4636 AVHWAccel *av_hwaccel_next(AVHWAccel *hwaccel);
4640 * Lock operation used by lockmgr
4643 AV_LOCK_CREATE, ///< Create a mutex
4644 AV_LOCK_OBTAIN, ///< Lock the mutex
4645 AV_LOCK_RELEASE, ///< Unlock the mutex
4646 AV_LOCK_DESTROY, ///< Free mutex resources
4650 * Register a user provided lock manager supporting the operations
4651 * specified by AVLockOp. mutex points to a (void *) where the
4652 * lockmgr should store/get a pointer to a user allocated mutex. It's
4653 * NULL upon AV_LOCK_CREATE and != NULL for all other ops.
4655 * @param cb User defined callback. Note: FFmpeg may invoke calls to this
4656 * callback during the call to av_lockmgr_register().
4657 * Thus, the application must be prepared to handle that.
4658 * If cb is set to NULL the lockmgr will be unregistered.
4659 * Also note that during unregistration the previously registered
4660 * lockmgr callback may also be invoked.
4662 int av_lockmgr_register(int (*cb)(void **mutex, enum AVLockOp op));
4665 * Get the type of the given codec.
4667 enum AVMediaType avcodec_get_type(enum CodecID codec_id);
4670 * Get the name of a codec.
4671 * @return a static string identifying the codec; never NULL
4673 const char *avcodec_get_name(enum CodecID id);
4676 * @return a positive value if s is open (i.e. avcodec_open2() was called on it
4677 * with no corresponding avcodec_close()), 0 otherwise.
4679 int avcodec_is_open(AVCodecContext *s);
4682 * @return a non-zero number if codec is an encoder, zero otherwise
4684 int av_codec_is_encoder(AVCodec *codec);
4687 * @return a non-zero number if codec is a decoder, zero otherwise
4689 int av_codec_is_decoder(AVCodec *codec);
4695 #endif /* AVCODEC_AVCODEC_H */