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,
260 CODEC_ID_Y41P = MKBETAG('Y','4','1','P'),
261 CODEC_ID_ESCAPE130 = MKBETAG('E','1','3','0'),
262 CODEC_ID_EXR = MKBETAG('0','E','X','R'),
263 CODEC_ID_AVRP = MKBETAG('A','V','R','P'),
265 CODEC_ID_G2M = MKBETAG( 0 ,'G','2','M'),
266 CODEC_ID_AVUI = MKBETAG('A','V','U','I'),
267 CODEC_ID_AYUV = MKBETAG('A','Y','U','V'),
268 CODEC_ID_V308 = MKBETAG('V','3','0','8'),
269 CODEC_ID_V408 = MKBETAG('V','4','0','8'),
270 CODEC_ID_YUV4 = MKBETAG('Y','U','V','4'),
272 /* various PCM "codecs" */
273 CODEC_ID_FIRST_AUDIO = 0x10000, ///< A dummy id pointing at the start of audio codecs
274 CODEC_ID_PCM_S16LE = 0x10000,
290 CODEC_ID_PCM_S24DAUD,
292 CODEC_ID_PCM_S16LE_PLANAR,
301 CODEC_ID_PCM_S8_PLANAR,
303 /* various ADPCM codecs */
304 CODEC_ID_ADPCM_IMA_QT = 0x11000,
305 CODEC_ID_ADPCM_IMA_WAV,
306 CODEC_ID_ADPCM_IMA_DK3,
307 CODEC_ID_ADPCM_IMA_DK4,
308 CODEC_ID_ADPCM_IMA_WS,
309 CODEC_ID_ADPCM_IMA_SMJPEG,
318 CODEC_ID_ADPCM_YAMAHA,
319 CODEC_ID_ADPCM_SBPRO_4,
320 CODEC_ID_ADPCM_SBPRO_3,
321 CODEC_ID_ADPCM_SBPRO_2,
323 CODEC_ID_ADPCM_IMA_AMV,
324 CODEC_ID_ADPCM_EA_R1,
325 CODEC_ID_ADPCM_EA_R3,
326 CODEC_ID_ADPCM_EA_R2,
327 CODEC_ID_ADPCM_IMA_EA_SEAD,
328 CODEC_ID_ADPCM_IMA_EA_EACS,
329 CODEC_ID_ADPCM_EA_XAS,
330 CODEC_ID_ADPCM_EA_MAXIS_XA,
331 CODEC_ID_ADPCM_IMA_ISS,
333 CODEC_ID_ADPCM_IMA_APC,
336 CODEC_ID_AMR_NB = 0x12000,
339 /* RealAudio codecs*/
340 CODEC_ID_RA_144 = 0x13000,
343 /* various DPCM codecs */
344 CODEC_ID_ROQ_DPCM = 0x14000,
345 CODEC_ID_INTERPLAY_DPCM,
350 CODEC_ID_MP2 = 0x15000,
351 CODEC_ID_MP3, ///< preferred ID for decoding MPEG audio layer 1, 2 or 3
367 CODEC_ID_WESTWOOD_SND1,
368 CODEC_ID_GSM, ///< as in Berlin toast format
376 CODEC_ID_DSICINAUDIO,
380 CODEC_ID_GSM_MS, /* as found in WAV */
389 CODEC_ID_WMALOSSLESS,
398 CODEC_ID_BINKAUDIO_RDFT,
399 CODEC_ID_BINKAUDIO_DCT,
409 CODEC_ID_FFWAVESYNTH = MKBETAG('F','F','W','S'),
410 CODEC_ID_8SVX_RAW = MKBETAG('8','S','V','X'),
411 CODEC_ID_SONIC = MKBETAG('S','O','N','C'),
412 CODEC_ID_SONIC_LS = MKBETAG('S','O','N','L'),
414 /* subtitle codecs */
415 CODEC_ID_FIRST_SUBTITLE = 0x17000, ///< A dummy ID pointing at the start of subtitle codecs.
416 CODEC_ID_DVD_SUBTITLE = 0x17000,
417 CODEC_ID_DVB_SUBTITLE,
418 CODEC_ID_TEXT, ///< raw UTF-8 text
422 CODEC_ID_HDMV_PGS_SUBTITLE,
423 CODEC_ID_DVB_TELETEXT,
425 CODEC_ID_MICRODVD = MKBETAG('m','D','V','D'),
426 CODEC_ID_EIA_608 = MKBETAG('c','6','0','8'),
427 CODEC_ID_JACOSUB = MKBETAG('J','S','U','B'),
429 /* other specific kind of codecs (generally used for attachments) */
430 CODEC_ID_FIRST_UNKNOWN = 0x18000, ///< A dummy ID pointing at the start of various fake codecs.
431 CODEC_ID_TTF = 0x18000,
432 CODEC_ID_BINTEXT = MKBETAG('B','T','X','T'),
433 CODEC_ID_XBIN = MKBETAG('X','B','I','N'),
434 CODEC_ID_IDF = MKBETAG( 0 ,'I','D','F'),
436 CODEC_ID_PROBE = 0x19000, ///< codec_id is not known (like CODEC_ID_NONE) but lavf should attempt to identify it
438 CODEC_ID_MPEG2TS = 0x20000, /**< _FAKE_ codec to indicate a raw MPEG-2 TS
439 * stream (only used by libavformat) */
440 CODEC_ID_MPEG4SYSTEMS = 0x20001, /**< _FAKE_ codec to indicate a MPEG-4 Systems
441 * stream (only used by libavformat) */
442 CODEC_ID_FFMETADATA = 0x21000, ///< Dummy codec for streams containing only metadata information.
445 #if FF_API_OLD_DECODE_AUDIO
447 #define AVCODEC_MAX_AUDIO_FRAME_SIZE 192000 // 1 second of 48khz 32bit audio
451 * @ingroup lavc_decoding
452 * Required number of additionally allocated bytes at the end of the input bitstream for decoding.
453 * This is mainly needed because some optimized bitstream readers read
454 * 32 or 64 bit at once and could read over the end.<br>
455 * Note: If the first 23 bits of the additional bytes are not 0, then damaged
456 * MPEG bitstreams could cause overread and segfault.
458 #define FF_INPUT_BUFFER_PADDING_SIZE 16
461 * @ingroup lavc_encoding
462 * minimum encoding buffer size
463 * Used to avoid some checks during header writing.
465 #define FF_MIN_BUFFER_SIZE 16384
469 * @ingroup lavc_encoding
470 * motion estimation type.
473 ME_ZERO = 1, ///< no search, that is use 0,0 vector whenever one is needed
477 ME_EPZS, ///< enhanced predictive zonal search
478 ME_X1, ///< reserved for experiments
479 ME_HEX, ///< hexagon based search
480 ME_UMH, ///< uneven multi-hexagon search
481 ME_ITER, ///< iterative search
482 ME_TESA, ///< transformed exhaustive search algorithm
486 * @ingroup lavc_decoding
489 /* We leave some space between them for extensions (drop some
490 * keyframes for intra-only or drop just some bidir frames). */
491 AVDISCARD_NONE =-16, ///< discard nothing
492 AVDISCARD_DEFAULT = 0, ///< discard useless packets like 0 size packets in avi
493 AVDISCARD_NONREF = 8, ///< discard all non reference
494 AVDISCARD_BIDIR = 16, ///< discard all bidirectional frames
495 AVDISCARD_NONKEY = 32, ///< discard all frames except keyframes
496 AVDISCARD_ALL = 48, ///< discard all
499 enum AVColorPrimaries{
500 AVCOL_PRI_BT709 = 1, ///< also ITU-R BT1361 / IEC 61966-2-4 / SMPTE RP177 Annex B
501 AVCOL_PRI_UNSPECIFIED = 2,
502 AVCOL_PRI_BT470M = 4,
503 AVCOL_PRI_BT470BG = 5, ///< also ITU-R BT601-6 625 / ITU-R BT1358 625 / ITU-R BT1700 625 PAL & SECAM
504 AVCOL_PRI_SMPTE170M = 6, ///< also ITU-R BT601-6 525 / ITU-R BT1358 525 / ITU-R BT1700 NTSC
505 AVCOL_PRI_SMPTE240M = 7, ///< functionally identical to above
507 AVCOL_PRI_NB , ///< Not part of ABI
510 enum AVColorTransferCharacteristic{
511 AVCOL_TRC_BT709 = 1, ///< also ITU-R BT1361
512 AVCOL_TRC_UNSPECIFIED = 2,
513 AVCOL_TRC_GAMMA22 = 4, ///< also ITU-R BT470M / ITU-R BT1700 625 PAL & SECAM
514 AVCOL_TRC_GAMMA28 = 5, ///< also ITU-R BT470BG
515 AVCOL_TRC_SMPTE240M = 7,
516 AVCOL_TRC_NB , ///< Not part of ABI
521 AVCOL_SPC_BT709 = 1, ///< also ITU-R BT1361 / IEC 61966-2-4 xvYCC709 / SMPTE RP177 Annex B
522 AVCOL_SPC_UNSPECIFIED = 2,
524 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
525 AVCOL_SPC_SMPTE170M = 6, ///< also ITU-R BT601-6 525 / ITU-R BT1358 525 / ITU-R BT1700 NTSC / functionally identical to above
526 AVCOL_SPC_SMPTE240M = 7,
527 AVCOL_SPC_YCOCG = 8, ///< Used by Dirac / VC-2 and H.264 FRext, see ITU-T SG16
528 AVCOL_SPC_NB , ///< Not part of ABI
530 #define AVCOL_SPC_YCGCO AVCOL_SPC_YCOCG
533 AVCOL_RANGE_UNSPECIFIED = 0,
534 AVCOL_RANGE_MPEG = 1, ///< the normal 219*2^(n-8) "MPEG" YUV ranges
535 AVCOL_RANGE_JPEG = 2, ///< the normal 2^n-1 "JPEG" YUV ranges
536 AVCOL_RANGE_NB , ///< Not part of ABI
540 * X X 3 4 X X are luma samples,
541 * 1 2 1-6 are possible chroma positions
542 * X X 5 6 X 0 is undefined/unknown position
544 enum AVChromaLocation{
545 AVCHROMA_LOC_UNSPECIFIED = 0,
546 AVCHROMA_LOC_LEFT = 1, ///< mpeg2/4, h264 default
547 AVCHROMA_LOC_CENTER = 2, ///< mpeg1, jpeg, h263
548 AVCHROMA_LOC_TOPLEFT = 3, ///< DV
549 AVCHROMA_LOC_TOP = 4,
550 AVCHROMA_LOC_BOTTOMLEFT = 5,
551 AVCHROMA_LOC_BOTTOM = 6,
552 AVCHROMA_LOC_NB , ///< Not part of ABI
555 enum AVAudioServiceType {
556 AV_AUDIO_SERVICE_TYPE_MAIN = 0,
557 AV_AUDIO_SERVICE_TYPE_EFFECTS = 1,
558 AV_AUDIO_SERVICE_TYPE_VISUALLY_IMPAIRED = 2,
559 AV_AUDIO_SERVICE_TYPE_HEARING_IMPAIRED = 3,
560 AV_AUDIO_SERVICE_TYPE_DIALOGUE = 4,
561 AV_AUDIO_SERVICE_TYPE_COMMENTARY = 5,
562 AV_AUDIO_SERVICE_TYPE_EMERGENCY = 6,
563 AV_AUDIO_SERVICE_TYPE_VOICE_OVER = 7,
564 AV_AUDIO_SERVICE_TYPE_KARAOKE = 8,
565 AV_AUDIO_SERVICE_TYPE_NB , ///< Not part of ABI
569 * @ingroup lavc_encoding
571 typedef struct RcOverride{
574 int qscale; // If this is 0 then quality_factor will be used instead.
575 float quality_factor;
578 #define FF_MAX_B_FRAMES 16
581 These flags can be passed in AVCodecContext.flags before initialization.
582 Note: Not everything is supported yet.
585 #define CODEC_FLAG_QSCALE 0x0002 ///< Use fixed qscale.
586 #define CODEC_FLAG_4MV 0x0004 ///< 4 MV per MB allowed / advanced prediction for H.263.
587 #define CODEC_FLAG_QPEL 0x0010 ///< Use qpel MC.
588 #define CODEC_FLAG_GMC 0x0020 ///< Use GMC.
589 #define CODEC_FLAG_MV0 0x0040 ///< Always try a MB with MV=<0,0>.
591 * The parent program guarantees that the input for B-frames containing
592 * streams is not written to for at least s->max_b_frames+1 frames, if
593 * this is not set the input will be copied.
595 #define CODEC_FLAG_INPUT_PRESERVED 0x0100
596 #define CODEC_FLAG_PASS1 0x0200 ///< Use internal 2pass ratecontrol in first pass mode.
597 #define CODEC_FLAG_PASS2 0x0400 ///< Use internal 2pass ratecontrol in second pass mode.
598 #define CODEC_FLAG_GRAY 0x2000 ///< Only decode/encode grayscale.
599 #define CODEC_FLAG_EMU_EDGE 0x4000 ///< Don't draw edges.
600 #define CODEC_FLAG_PSNR 0x8000 ///< error[?] variables will be set during encoding.
601 #define CODEC_FLAG_TRUNCATED 0x00010000 /** Input bitstream might be truncated at a random
602 location instead of only at frame boundaries. */
603 #define CODEC_FLAG_NORMALIZE_AQP 0x00020000 ///< Normalize adaptive quantization.
604 #define CODEC_FLAG_INTERLACED_DCT 0x00040000 ///< Use interlaced DCT.
605 #define CODEC_FLAG_LOW_DELAY 0x00080000 ///< Force low delay.
606 #define CODEC_FLAG_GLOBAL_HEADER 0x00400000 ///< Place global headers in extradata instead of every keyframe.
607 #define CODEC_FLAG_BITEXACT 0x00800000 ///< Use only bitexact stuff (except (I)DCT).
608 /* Fx : Flag for h263+ extra options */
609 #define CODEC_FLAG_AC_PRED 0x01000000 ///< H.263 advanced intra coding / MPEG-4 AC prediction
610 #define CODEC_FLAG_LOOP_FILTER 0x00000800 ///< loop filter
611 #define CODEC_FLAG_INTERLACED_ME 0x20000000 ///< interlaced motion estimation
612 #define CODEC_FLAG_CLOSED_GOP 0x80000000
613 #define CODEC_FLAG2_FAST 0x00000001 ///< Allow non spec compliant speedup tricks.
614 #define CODEC_FLAG2_NO_OUTPUT 0x00000004 ///< Skip bitstream encoding.
615 #define CODEC_FLAG2_LOCAL_HEADER 0x00000008 ///< Place global headers at every keyframe instead of in extradata.
616 #define CODEC_FLAG2_DROP_FRAME_TIMECODE 0x00002000 ///< timecode is in drop frame format. DEPRECATED!!!!
617 #if FF_API_MPV_GLOBAL_OPTS
618 #define CODEC_FLAG_CBP_RD 0x04000000 ///< Use rate distortion optimization for cbp.
619 #define CODEC_FLAG_QP_RD 0x08000000 ///< Use rate distortion optimization for qp selectioon.
620 #define CODEC_FLAG2_STRICT_GOP 0x00000002 ///< Strictly enforce GOP size.
621 #define CODEC_FLAG2_SKIP_RD 0x00004000 ///< RD optimal MB level residual skipping
623 #define CODEC_FLAG2_CHUNKS 0x00008000 ///< Input bitstream might be truncated at a packet boundaries instead of only at frame boundaries.
624 #define CODEC_FLAG2_SHOW_ALL 0x00400000 ///< Show all frames before the first keyframe
626 /* Unsupported options :
627 * Syntax Arithmetic coding (SAC)
628 * Reference Picture Selection
629 * Independent Segment Decoding */
631 /* codec capabilities */
633 #define CODEC_CAP_DRAW_HORIZ_BAND 0x0001 ///< Decoder can use draw_horiz_band callback.
635 * Codec uses get_buffer() for allocating buffers and supports custom allocators.
636 * If not set, it might not use get_buffer() at all or use operations that
637 * assume the buffer was allocated by avcodec_default_get_buffer.
639 #define CODEC_CAP_DR1 0x0002
640 #define CODEC_CAP_TRUNCATED 0x0008
641 /* Codec can export data for HW decoding (XvMC). */
642 #define CODEC_CAP_HWACCEL 0x0010
644 * Encoder or decoder requires flushing with NULL input at the end in order to
645 * give the complete and correct output.
647 * NOTE: If this flag is not set, the codec is guaranteed to never be fed with
648 * with NULL data. The user can still send NULL data to the public encode
649 * or decode function, but libavcodec will not pass it along to the codec
650 * unless this flag is set.
653 * The decoder has a non-zero delay and needs to be fed with avpkt->data=NULL,
654 * avpkt->size=0 at the end to get the delayed data until the decoder no longer
658 * The encoder needs to be fed with NULL data at the end of encoding until the
659 * encoder no longer returns data.
661 * NOTE: For encoders implementing the AVCodec.encode2() function, setting this
662 * flag also means that the encoder must set the pts and duration for
663 * each output packet. If this flag is not set, the pts and duration will
664 * be determined by libavcodec from the input frame.
666 #define CODEC_CAP_DELAY 0x0020
668 * Codec can be fed a final frame with a smaller size.
669 * This can be used to prevent truncation of the last audio samples.
671 #define CODEC_CAP_SMALL_LAST_FRAME 0x0040
673 * Codec can export data for HW decoding (VDPAU).
675 #define CODEC_CAP_HWACCEL_VDPAU 0x0080
677 * Codec can output multiple frames per AVPacket
678 * Normally demuxers return one frame at a time, demuxers which do not do
679 * are connected to a parser to split what they return into proper frames.
680 * This flag is reserved to the very rare category of codecs which have a
681 * bitstream that cannot be split into frames without timeconsuming
682 * operations like full decoding. Demuxers carring such bitstreams thus
683 * may return multiple frames in a packet. This has many disadvantages like
684 * prohibiting stream copy in many cases thus it should only be considered
687 #define CODEC_CAP_SUBFRAMES 0x0100
689 * Codec is experimental and is thus avoided in favor of non experimental
692 #define CODEC_CAP_EXPERIMENTAL 0x0200
694 * Codec should fill in channel configuration and samplerate instead of container
696 #define CODEC_CAP_CHANNEL_CONF 0x0400
699 * Codec is able to deal with negative linesizes
701 #define CODEC_CAP_NEG_LINESIZES 0x0800
704 * Codec supports frame-level multithreading.
706 #define CODEC_CAP_FRAME_THREADS 0x1000
708 * Codec supports slice-based (or partition-based) multithreading.
710 #define CODEC_CAP_SLICE_THREADS 0x2000
712 * Codec supports changed parameters at any point.
714 #define CODEC_CAP_PARAM_CHANGE 0x4000
716 * Codec supports avctx->thread_count == 0 (auto).
718 #define CODEC_CAP_AUTO_THREADS 0x8000
720 * Audio encoder supports receiving a different number of samples in each call.
722 #define CODEC_CAP_VARIABLE_FRAME_SIZE 0x10000
726 #define CODEC_CAP_LOSSLESS 0x80000000
728 //The following defines may change, don't expect compatibility if you use them.
729 #define MB_TYPE_INTRA4x4 0x0001
730 #define MB_TYPE_INTRA16x16 0x0002 //FIXME H.264-specific
731 #define MB_TYPE_INTRA_PCM 0x0004 //FIXME H.264-specific
732 #define MB_TYPE_16x16 0x0008
733 #define MB_TYPE_16x8 0x0010
734 #define MB_TYPE_8x16 0x0020
735 #define MB_TYPE_8x8 0x0040
736 #define MB_TYPE_INTERLACED 0x0080
737 #define MB_TYPE_DIRECT2 0x0100 //FIXME
738 #define MB_TYPE_ACPRED 0x0200
739 #define MB_TYPE_GMC 0x0400
740 #define MB_TYPE_SKIP 0x0800
741 #define MB_TYPE_P0L0 0x1000
742 #define MB_TYPE_P1L0 0x2000
743 #define MB_TYPE_P0L1 0x4000
744 #define MB_TYPE_P1L1 0x8000
745 #define MB_TYPE_L0 (MB_TYPE_P0L0 | MB_TYPE_P1L0)
746 #define MB_TYPE_L1 (MB_TYPE_P0L1 | MB_TYPE_P1L1)
747 #define MB_TYPE_L0L1 (MB_TYPE_L0 | MB_TYPE_L1)
748 #define MB_TYPE_QUANT 0x00010000
749 #define MB_TYPE_CBP 0x00020000
750 //Note bits 24-31 are reserved for codec specific use (h264 ref0, mpeg1 0mv, ...)
754 * This specifies the area which should be displayed.
755 * Note there may be multiple such areas for one frame.
757 typedef struct AVPanScan{
760 * - encoding: Set by user.
761 * - decoding: Set by libavcodec.
766 * width and height in 1/16 pel
767 * - encoding: Set by user.
768 * - decoding: Set by libavcodec.
774 * position of the top left corner in 1/16 pel for up to 3 fields/frames
775 * - encoding: Set by user.
776 * - decoding: Set by libavcodec.
778 int16_t position[3][2];
781 #define FF_QSCALE_TYPE_MPEG1 0
782 #define FF_QSCALE_TYPE_MPEG2 1
783 #define FF_QSCALE_TYPE_H264 2
784 #define FF_QSCALE_TYPE_VP56 3
786 #define FF_BUFFER_TYPE_INTERNAL 1
787 #define FF_BUFFER_TYPE_USER 2 ///< direct rendering buffers (image is (de)allocated by user)
788 #define FF_BUFFER_TYPE_SHARED 4 ///< Buffer from somewhere else; don't deallocate image (data/base), all other tables are not shared.
789 #define FF_BUFFER_TYPE_COPY 8 ///< Just a (modified) copy of some other buffer, don't deallocate anything.
791 #define FF_BUFFER_HINTS_VALID 0x01 // Buffer hints value is meaningful (if 0 ignore).
792 #define FF_BUFFER_HINTS_READABLE 0x02 // Codec will read from buffer.
793 #define FF_BUFFER_HINTS_PRESERVE 0x04 // User must not alter buffer content.
794 #define FF_BUFFER_HINTS_REUSABLE 0x08 // Codec will reuse the buffer (update).
797 * @defgroup lavc_packet AVPacket
799 * Types and functions for working with AVPacket.
802 enum AVPacketSideDataType {
804 AV_PKT_DATA_NEW_EXTRADATA,
807 * An AV_PKT_DATA_PARAM_CHANGE side data packet is laid out as follows:
810 * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_COUNT)
811 * s32le channel_count
812 * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_LAYOUT)
813 * u64le channel_layout
814 * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_SAMPLE_RATE)
816 * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_DIMENSIONS)
821 AV_PKT_DATA_PARAM_CHANGE,
824 * An AV_PKT_DATA_H263_MB_INFO side data packet contains a number of
825 * structures with info about macroblocks relevant to splitting the
826 * packet into smaller packets on macroblock edges (e.g. as for RFC 2190).
827 * That is, it does not necessarily contain info about all macroblocks,
828 * as long as the distance between macroblocks in the info is smaller
829 * than the target payload size.
830 * Each MB info structure is 12 bytes, and is laid out as follows:
832 * u32le bit offset from the start of the packet
833 * u8 current quantizer at the start of the macroblock
835 * u16le macroblock address within the GOB
836 * u8 horizontal MV predictor
837 * u8 vertical MV predictor
838 * u8 horizontal MV predictor for block number 3
839 * u8 vertical MV predictor for block number 3
842 AV_PKT_DATA_H263_MB_INFO,
845 typedef struct AVPacket {
847 * Presentation timestamp in AVStream->time_base units; the time at which
848 * the decompressed packet will be presented to the user.
849 * Can be AV_NOPTS_VALUE if it is not stored in the file.
850 * pts MUST be larger or equal to dts as presentation cannot happen before
851 * decompression, unless one wants to view hex dumps. Some formats misuse
852 * the terms dts and pts/cts to mean something different. Such timestamps
853 * must be converted to true pts/dts before they are stored in AVPacket.
857 * Decompression timestamp in AVStream->time_base units; the time at which
858 * the packet is decompressed.
859 * Can be AV_NOPTS_VALUE if it is not stored in the file.
866 * A combination of AV_PKT_FLAG values
870 * Additional packet data that can be provided by the container.
871 * Packet can contain several types of side information.
876 enum AVPacketSideDataType type;
881 * Duration of this packet in AVStream->time_base units, 0 if unknown.
882 * Equals next_pts - this_pts in presentation order.
885 void (*destruct)(struct AVPacket *);
887 int64_t pos; ///< byte position in stream, -1 if unknown
890 * Time difference in AVStream->time_base units from the pts of this
891 * packet to the point at which the output from the decoder has converged
892 * independent from the availability of previous frames. That is, the
893 * frames are virtually identical no matter if decoding started from
894 * the very first frame or from this keyframe.
895 * Is AV_NOPTS_VALUE if unknown.
896 * This field is not the display duration of the current packet.
897 * This field has no meaning if the packet does not have AV_PKT_FLAG_KEY
900 * The purpose of this field is to allow seeking in streams that have no
901 * keyframes in the conventional sense. It corresponds to the
902 * recovery point SEI in H.264 and match_time_delta in NUT. It is also
903 * essential for some types of subtitle streams to ensure that all
904 * subtitles are correctly displayed after seeking.
906 int64_t convergence_duration;
908 #define AV_PKT_FLAG_KEY 0x0001 ///< The packet contains a keyframe
909 #define AV_PKT_FLAG_CORRUPT 0x0002 ///< The packet content is corrupted
911 enum AVSideDataParamChangeFlags {
912 AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_COUNT = 0x0001,
913 AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_LAYOUT = 0x0002,
914 AV_SIDE_DATA_PARAM_CHANGE_SAMPLE_RATE = 0x0004,
915 AV_SIDE_DATA_PARAM_CHANGE_DIMENSIONS = 0x0008,
923 * New fields can be added to the end of AVFRAME with minor version
924 * bumps. Similarly fields that are marked as to be only accessed by
925 * av_opt_ptr() can be reordered. This allows 2 forks to add fields
926 * without breaking compatibility with each other.
927 * Removal, reordering and changes in the remaining cases require
928 * a major version bump.
929 * sizeof(AVFrame) must not be used outside libavcodec.
931 typedef struct AVFrame {
932 #define AV_NUM_DATA_POINTERS 8
934 * pointer to the picture/channel planes.
935 * This might be different from the first allocated byte
936 * - encoding: Set by user
937 * - decoding: set by AVCodecContext.get_buffer()
939 uint8_t *data[AV_NUM_DATA_POINTERS];
942 * Size, in bytes, of the data for each picture/channel plane.
944 * For audio, only linesize[0] may be set. For planar audio, each channel
945 * plane must be the same size.
947 * - encoding: Set by user
948 * - decoding: set by AVCodecContext.get_buffer()
950 int linesize[AV_NUM_DATA_POINTERS];
953 * pointers to the data planes/channels.
955 * For video, this should simply point to data[].
957 * For planar audio, each channel has a separate data pointer, and
958 * linesize[0] contains the size of each channel buffer.
959 * For packed audio, there is just one data pointer, and linesize[0]
960 * contains the total size of the buffer for all channels.
962 * Note: Both data and extended_data will always be set by get_buffer(),
963 * but for planar audio with more channels that can fit in data,
964 * extended_data must be used by the decoder in order to access all
968 * decoding: set by AVCodecContext.get_buffer()
970 uint8_t **extended_data;
973 * width and height of the video frame
975 * - decoding: Read by user.
980 * number of audio samples (per channel) described by this frame
981 * - encoding: Set by user
982 * - decoding: Set by libavcodec
987 * format of the frame, -1 if unknown or unset
988 * Values correspond to enum PixelFormat for video frames,
989 * enum AVSampleFormat for audio)
991 * - decoding: Read by user.
996 * 1 -> keyframe, 0-> not
997 * - encoding: Set by libavcodec.
998 * - decoding: Set by libavcodec.
1003 * Picture type of the frame, see ?_TYPE below.
1004 * - encoding: Set by libavcodec. for coded_picture (and set by user for input).
1005 * - decoding: Set by libavcodec.
1007 enum AVPictureType pict_type;
1010 * pointer to the first allocated byte of the picture. Can be used in get_buffer/release_buffer.
1011 * This isn't used by libavcodec unless the default get/release_buffer() is used.
1015 uint8_t *base[AV_NUM_DATA_POINTERS];
1018 * sample aspect ratio for the video frame, 0/1 if unknown/unspecified
1019 * - encoding: unused
1020 * - decoding: Read by user.
1022 AVRational sample_aspect_ratio;
1025 * presentation timestamp in time_base units (time when frame should be shown to user)
1026 * If AV_NOPTS_VALUE then frame_rate = 1/time_base will be assumed.
1027 * - encoding: MUST be set by user.
1028 * - decoding: Set by libavcodec.
1033 * reordered pts from the last AVPacket that has been input into the decoder
1034 * - encoding: unused
1035 * - decoding: Read by user.
1040 * dts from the last AVPacket that has been input into the decoder
1041 * - encoding: unused
1042 * - decoding: Read by user.
1047 * picture number in bitstream order
1048 * - encoding: set by
1049 * - decoding: Set by libavcodec.
1051 int coded_picture_number;
1053 * picture number in display order
1054 * - encoding: set by
1055 * - decoding: Set by libavcodec.
1057 int display_picture_number;
1060 * quality (between 1 (good) and FF_LAMBDA_MAX (bad))
1061 * - encoding: Set by libavcodec. for coded_picture (and set by user for input).
1062 * - decoding: Set by libavcodec.
1067 * is this picture used as reference
1068 * The values for this are the same as the MpegEncContext.picture_structure
1069 * variable, that is 1->top field, 2->bottom field, 3->frame/both fields.
1070 * Set to 4 for delayed, non-reference frames.
1071 * - encoding: unused
1072 * - decoding: Set by libavcodec. (before get_buffer() call)).
1078 * - encoding: unused
1079 * - decoding: Set by libavcodec.
1081 int8_t *qscale_table;
1084 * - encoding: unused
1085 * - decoding: Set by libavcodec.
1095 * mbskip_table[mb]>=1 if MB didn't change
1096 * stride= mb_width = (width+15)>>4
1097 * - encoding: unused
1098 * - decoding: Set by libavcodec.
1100 uint8_t *mbskip_table;
1103 * motion vector table
1106 * int mv_sample_log2= 4 - motion_subsample_log2;
1107 * int mb_width= (width+15)>>4;
1108 * int mv_stride= (mb_width << mv_sample_log2) + 1;
1109 * motion_val[direction][x + y*mv_stride][0->mv_x, 1->mv_y];
1111 * - encoding: Set by user.
1112 * - decoding: Set by libavcodec.
1114 int16_t (*motion_val[2])[2];
1117 * macroblock type table
1118 * mb_type_base + mb_width + 2
1119 * - encoding: Set by user.
1120 * - decoding: Set by libavcodec.
1126 * - encoding: unused
1127 * - decoding: Set by libavcodec.
1132 * motion reference frame index
1133 * the order in which these are stored can depend on the codec.
1134 * - encoding: Set by user.
1135 * - decoding: Set by libavcodec.
1137 int8_t *ref_index[2];
1140 * for some private data of the user
1141 * - encoding: unused
1142 * - decoding: Set by user.
1148 * - encoding: Set by libavcodec. if flags&CODEC_FLAG_PSNR.
1149 * - decoding: unused
1151 uint64_t error[AV_NUM_DATA_POINTERS];
1154 * type of the buffer (to keep track of who has to deallocate data[*])
1155 * - encoding: Set by the one who allocates it.
1156 * - decoding: Set by the one who allocates it.
1157 * Note: User allocated (direct rendering) & internal buffers cannot coexist currently.
1162 * When decoding, this signals how much the picture must be delayed.
1163 * extra_delay = repeat_pict / (2*fps)
1164 * - encoding: unused
1165 * - decoding: Set by libavcodec.
1170 * The content of the picture is interlaced.
1171 * - encoding: Set by user.
1172 * - decoding: Set by libavcodec. (default 0)
1174 int interlaced_frame;
1177 * If the content is interlaced, is top field displayed first.
1178 * - encoding: Set by user.
1179 * - decoding: Set by libavcodec.
1181 int top_field_first;
1184 * Tell user application that palette has changed from previous frame.
1185 * - encoding: ??? (no palette-enabled encoder yet)
1186 * - decoding: Set by libavcodec. (default 0).
1188 int palette_has_changed;
1191 * codec suggestion on buffer type if != 0
1192 * - encoding: unused
1193 * - decoding: Set by libavcodec. (before get_buffer() call)).
1199 * - encoding: Set by user.
1200 * - decoding: Set by libavcodec.
1202 AVPanScan *pan_scan;
1205 * reordered opaque 64bit (generally an integer or a double precision float
1206 * PTS but can be anything).
1207 * The user sets AVCodecContext.reordered_opaque to represent the input at
1209 * the decoder reorders values as needed and sets AVFrame.reordered_opaque
1210 * to exactly one of the values provided by the user through AVCodecContext.reordered_opaque
1211 * @deprecated in favor of pkt_pts
1212 * - encoding: unused
1213 * - decoding: Read by user.
1215 int64_t reordered_opaque;
1218 * hardware accelerator private data (FFmpeg-allocated)
1219 * - encoding: unused
1220 * - decoding: Set by libavcodec
1222 void *hwaccel_picture_private;
1225 * the AVCodecContext which ff_thread_get_buffer() was last called on
1226 * - encoding: Set by libavcodec.
1227 * - decoding: Set by libavcodec.
1229 struct AVCodecContext *owner;
1232 * used by multithreading to store frame-specific info
1233 * - encoding: Set by libavcodec.
1234 * - decoding: Set by libavcodec.
1236 void *thread_opaque;
1239 * log2 of the size of the block which a single vector in motion_val represents:
1240 * (4->16x16, 3->8x8, 2-> 4x4, 1-> 2x2)
1241 * - encoding: unused
1242 * - decoding: Set by libavcodec.
1244 uint8_t motion_subsample_log2;
1247 * Sample rate of the audio data.
1249 * - encoding: unused
1250 * - decoding: read by user
1255 * Channel layout of the audio data.
1257 * - encoding: unused
1258 * - decoding: read by user.
1260 uint64_t channel_layout;
1263 * frame timestamp estimated using various heuristics, in stream time base
1264 * Code outside libavcodec should access this field using:
1265 * av_frame_get_best_effort_timestamp(frame)
1266 * - encoding: unused
1267 * - decoding: set by libavcodec, read by user.
1269 int64_t best_effort_timestamp;
1272 * reordered pos from the last AVPacket that has been input into the decoder
1273 * Code outside libavcodec should access this field using:
1274 * av_frame_get_pkt_pos(frame)
1275 * - encoding: unused
1276 * - decoding: Read by user.
1281 * duration of the corresponding packet, expressed in
1282 * AVStream->time_base units, 0 if unknown.
1283 * Code outside libavcodec should access this field using:
1284 * av_frame_get_pkt_duration(frame)
1285 * - encoding: unused
1286 * - decoding: Read by user.
1288 int64_t pkt_duration;
1292 * Accessors for some AVFrame fields.
1293 * The position of these field in the structure is not part of the ABI,
1294 * they should not be accessed directly outside libavcodec.
1296 int64_t av_frame_get_best_effort_timestamp(const AVFrame *frame);
1297 int64_t av_frame_get_pkt_duration (const AVFrame *frame);
1298 int64_t av_frame_get_pkt_pos (const AVFrame *frame);
1299 int64_t av_frame_get_channel_layout (const AVFrame *frame);
1300 int av_frame_get_sample_rate (const AVFrame *frame);
1301 void av_frame_set_best_effort_timestamp(AVFrame *frame, int64_t val);
1302 void av_frame_set_pkt_duration (AVFrame *frame, int64_t val);
1303 void av_frame_set_pkt_pos (AVFrame *frame, int64_t val);
1304 void av_frame_set_channel_layout (AVFrame *frame, int64_t val);
1305 void av_frame_set_sample_rate (AVFrame *frame, int val);
1307 struct AVCodecInternal;
1311 AV_FIELD_PROGRESSIVE,
1312 AV_FIELD_TT, //< Top coded_first, top displayed first
1313 AV_FIELD_BB, //< Bottom coded first, bottom displayed first
1314 AV_FIELD_TB, //< Top coded first, bottom displayed first
1315 AV_FIELD_BT, //< Bottom coded first, top displayed first
1319 * main external API structure.
1320 * New fields can be added to the end with minor version bumps.
1321 * Removal, reordering and changes to existing fields require a major
1323 * Please use AVOptions (av_opt* / av_set/get*()) to access these fields from user
1325 * sizeof(AVCodecContext) must not be used outside libav*.
1327 typedef struct AVCodecContext {
1329 * information on struct for av_log
1330 * - set by avcodec_alloc_context3
1332 const AVClass *av_class;
1333 int log_level_offset;
1335 enum AVMediaType codec_type; /* see AVMEDIA_TYPE_xxx */
1336 struct AVCodec *codec;
1337 char codec_name[32];
1338 enum CodecID codec_id; /* see CODEC_ID_xxx */
1341 * fourcc (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A').
1342 * This is used to work around some encoder bugs.
1343 * A demuxer should set this to what is stored in the field used to identify the codec.
1344 * If there are multiple such fields in a container then the demuxer should choose the one
1345 * which maximizes the information about the used codec.
1346 * If the codec tag field in a container is larger than 32 bits then the demuxer should
1347 * remap the longer ID to 32 bits with a table or other structure. Alternatively a new
1348 * extra_codec_tag + size could be added but for this a clear advantage must be demonstrated
1350 * - encoding: Set by user, if not then the default based on codec_id will be used.
1351 * - decoding: Set by user, will be converted to uppercase by libavcodec during init.
1353 unsigned int codec_tag;
1356 * fourcc from the AVI stream header (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A').
1357 * This is used to work around some encoder bugs.
1358 * - encoding: unused
1359 * - decoding: Set by user, will be converted to uppercase by libavcodec during init.
1361 unsigned int stream_codec_tag;
1365 * @deprecated this field is unused
1367 attribute_deprecated int sub_id;
1373 * Private context used for internal data.
1375 * Unlike priv_data, this is not codec-specific. It is used in general
1376 * libavcodec functions.
1378 struct AVCodecInternal *internal;
1381 * Private data of the user, can be used to carry app specific stuff.
1382 * - encoding: Set by user.
1383 * - decoding: Set by user.
1388 * the average bitrate
1389 * - encoding: Set by user; unused for constant quantizer encoding.
1390 * - decoding: Set by libavcodec. 0 or some bitrate if this info is available in the stream.
1395 * number of bits the bitstream is allowed to diverge from the reference.
1396 * the reference can be CBR (for CBR pass1) or VBR (for pass2)
1397 * - encoding: Set by user; unused for constant quantizer encoding.
1398 * - decoding: unused
1400 int bit_rate_tolerance;
1403 * Global quality for codecs which cannot change it per frame.
1404 * This should be proportional to MPEG-1/2/4 qscale.
1405 * - encoding: Set by user.
1406 * - decoding: unused
1411 * - encoding: Set by user.
1412 * - decoding: unused
1414 int compression_level;
1415 #define FF_COMPRESSION_DEFAULT -1
1419 * - encoding: Set by user.
1420 * - decoding: Set by user.
1426 * - encoding: Set by user.
1427 * - decoding: Set by user.
1432 * some codecs need / can use extradata like Huffman tables.
1433 * mjpeg: Huffman tables
1434 * rv10: additional flags
1435 * mpeg4: global headers (they can be in the bitstream or here)
1436 * The allocated memory should be FF_INPUT_BUFFER_PADDING_SIZE bytes larger
1437 * than extradata_size to avoid prolems if it is read with the bitstream reader.
1438 * The bytewise contents of extradata must not depend on the architecture or CPU endianness.
1439 * - encoding: Set/allocated/freed by libavcodec.
1440 * - decoding: Set/allocated/freed by user.
1446 * This is the fundamental unit of time (in seconds) in terms
1447 * of which frame timestamps are represented. For fixed-fps content,
1448 * timebase should be 1/framerate and timestamp increments should be
1450 * - encoding: MUST be set by user.
1451 * - decoding: Set by libavcodec.
1453 AVRational time_base;
1456 * For some codecs, the time base is closer to the field rate than the frame rate.
1457 * Most notably, H.264 and MPEG-2 specify time_base as half of frame duration
1458 * if no telecine is used ...
1460 * Set to time_base ticks per frame. Default 1, e.g., H.264/MPEG-2 set it to 2.
1462 int ticks_per_frame;
1465 * Encoding: Number of frames delay there will be from the encoder input to
1466 * the decoder output. (we assume the decoder matches the spec)
1467 * Decoding: Number of frames delay in addition to what a standard decoder
1468 * as specified in the spec would produce.
1471 * Number of frames the decoded output will be delayed relative to the
1475 * Number of "priming" samples added to the beginning of the stream
1476 * during encoding. The decoded output will be delayed by this many
1477 * samples relative to the input to the encoder. Note that this field is
1478 * purely informational and does not directly affect the pts output by
1479 * the encoder, which should always be based on the actual presentation
1480 * time, including any delay.
1482 * - encoding: Set by libavcodec.
1483 * - decoding: Set by libavcodec.
1490 * picture width / height.
1491 * - encoding: MUST be set by user.
1492 * - decoding: Set by libavcodec.
1493 * Note: For compatibility it is possible to set this instead of
1494 * coded_width/height before decoding.
1499 * Bitstream width / height, may be different from width/height if lowres enabled.
1500 * - encoding: unused
1501 * - decoding: Set by user before init if known. Codec should override / dynamically change if needed.
1503 int coded_width, coded_height;
1505 #define FF_ASPECT_EXTENDED 15
1508 * the number of pictures in a group of pictures, or 0 for intra_only
1509 * - encoding: Set by user.
1510 * - decoding: unused
1515 * Pixel format, see PIX_FMT_xxx.
1516 * May be set by the demuxer if known from headers.
1517 * May be overriden by the decoder if it knows better.
1518 * - encoding: Set by user.
1519 * - decoding: Set by user if known, overridden by libavcodec if known
1521 enum PixelFormat pix_fmt;
1524 * Motion estimation algorithm used for video coding.
1525 * 1 (zero), 2 (full), 3 (log), 4 (phods), 5 (epzs), 6 (x1), 7 (hex),
1526 * 8 (umh), 9 (iter), 10 (tesa) [7, 8, 10 are x264 specific, 9 is snow specific]
1527 * - encoding: MUST be set by user.
1528 * - decoding: unused
1533 * If non NULL, 'draw_horiz_band' is called by the libavcodec
1534 * decoder to draw a horizontal band. It improves cache usage. Not
1535 * all codecs can do that. You must check the codec capabilities
1537 * When multithreading is used, it may be called from multiple threads
1538 * at the same time; threads might draw different parts of the same AVFrame,
1539 * or multiple AVFrames, and there is no guarantee that slices will be drawn
1541 * The function is also used by hardware acceleration APIs.
1542 * It is called at least once during frame decoding to pass
1543 * the data needed for hardware render.
1544 * In that mode instead of pixel data, AVFrame points to
1545 * a structure specific to the acceleration API. The application
1546 * reads the structure and can change some fields to indicate progress
1548 * - encoding: unused
1549 * - decoding: Set by user.
1550 * @param height the height of the slice
1551 * @param y the y position of the slice
1552 * @param type 1->top field, 2->bottom field, 3->frame
1553 * @param offset offset into the AVFrame.data from which the slice should be read
1555 void (*draw_horiz_band)(struct AVCodecContext *s,
1556 const AVFrame *src, int offset[AV_NUM_DATA_POINTERS],
1557 int y, int type, int height);
1560 * callback to negotiate the pixelFormat
1561 * @param fmt is the list of formats which are supported by the codec,
1562 * it is terminated by -1 as 0 is a valid format, the formats are ordered by quality.
1563 * The first is always the native one.
1564 * @return the chosen format
1565 * - encoding: unused
1566 * - decoding: Set by user, if not set the native format will be chosen.
1568 enum PixelFormat (*get_format)(struct AVCodecContext *s, const enum PixelFormat * fmt);
1571 * maximum number of B-frames between non-B-frames
1572 * Note: The output will be delayed by max_b_frames+1 relative to the input.
1573 * - encoding: Set by user.
1574 * - decoding: unused
1579 * qscale factor between IP and B-frames
1580 * If > 0 then the last P-frame quantizer will be used (q= lastp_q*factor+offset).
1581 * If < 0 then normal ratecontrol will be done (q= -normal_q*factor+offset).
1582 * - encoding: Set by user.
1583 * - decoding: unused
1585 float b_quant_factor;
1587 /** obsolete FIXME remove */
1589 #define FF_RC_STRATEGY_XVID 1
1591 int b_frame_strategy;
1593 #if FF_API_MPV_GLOBAL_OPTS
1595 * luma single coefficient elimination threshold
1596 * - encoding: Set by user.
1597 * - decoding: unused
1599 attribute_deprecated int luma_elim_threshold;
1602 * chroma single coeff elimination threshold
1603 * - encoding: Set by user.
1604 * - decoding: unused
1606 attribute_deprecated int chroma_elim_threshold;
1610 * qscale offset between IP and B-frames
1611 * - encoding: Set by user.
1612 * - decoding: unused
1614 float b_quant_offset;
1617 * Size of the frame reordering buffer in the decoder.
1618 * For MPEG-2 it is 1 IPB or 0 low delay IP.
1619 * - encoding: Set by libavcodec.
1620 * - decoding: Set by libavcodec.
1625 * 0-> h263 quant 1-> mpeg quant
1626 * - encoding: Set by user.
1627 * - decoding: unused
1632 * qscale factor between P and I-frames
1633 * If > 0 then the last p frame quantizer will be used (q= lastp_q*factor+offset).
1634 * If < 0 then normal ratecontrol will be done (q= -normal_q*factor+offset).
1635 * - encoding: Set by user.
1636 * - decoding: unused
1638 float i_quant_factor;
1641 * qscale offset between P and I-frames
1642 * - encoding: Set by user.
1643 * - decoding: unused
1645 float i_quant_offset;
1648 * luminance masking (0-> disabled)
1649 * - encoding: Set by user.
1650 * - decoding: unused
1655 * temporary complexity masking (0-> disabled)
1656 * - encoding: Set by user.
1657 * - decoding: unused
1659 float temporal_cplx_masking;
1662 * spatial complexity masking (0-> disabled)
1663 * - encoding: Set by user.
1664 * - decoding: unused
1666 float spatial_cplx_masking;
1669 * p block masking (0-> disabled)
1670 * - encoding: Set by user.
1671 * - decoding: unused
1676 * darkness masking (0-> disabled)
1677 * - encoding: Set by user.
1678 * - decoding: unused
1684 * - encoding: Set by libavcodec.
1685 * - decoding: Set by user (or 0).
1689 * prediction method (needed for huffyuv)
1690 * - encoding: Set by user.
1691 * - decoding: unused
1693 int prediction_method;
1694 #define FF_PRED_LEFT 0
1695 #define FF_PRED_PLANE 1
1696 #define FF_PRED_MEDIAN 2
1699 * slice offsets in the frame in bytes
1700 * - encoding: Set/allocated by libavcodec.
1701 * - decoding: Set/allocated by user (or NULL).
1706 * sample aspect ratio (0 if unknown)
1707 * That is the width of a pixel divided by the height of the pixel.
1708 * Numerator and denominator must be relatively prime and smaller than 256 for some video standards.
1709 * - encoding: Set by user.
1710 * - decoding: Set by libavcodec.
1712 AVRational sample_aspect_ratio;
1715 * motion estimation comparison function
1716 * - encoding: Set by user.
1717 * - decoding: unused
1721 * subpixel motion estimation comparison function
1722 * - encoding: Set by user.
1723 * - decoding: unused
1727 * macroblock comparison function (not supported yet)
1728 * - encoding: Set by user.
1729 * - decoding: unused
1733 * interlaced DCT comparison function
1734 * - encoding: Set by user.
1735 * - decoding: unused
1738 #define FF_CMP_SAD 0
1739 #define FF_CMP_SSE 1
1740 #define FF_CMP_SATD 2
1741 #define FF_CMP_DCT 3
1742 #define FF_CMP_PSNR 4
1743 #define FF_CMP_BIT 5
1745 #define FF_CMP_ZERO 7
1746 #define FF_CMP_VSAD 8
1747 #define FF_CMP_VSSE 9
1748 #define FF_CMP_NSSE 10
1749 #define FF_CMP_W53 11
1750 #define FF_CMP_W97 12
1751 #define FF_CMP_DCTMAX 13
1752 #define FF_CMP_DCT264 14
1753 #define FF_CMP_CHROMA 256
1756 * ME diamond size & shape
1757 * - encoding: Set by user.
1758 * - decoding: unused
1763 * amount of previous MV predictors (2a+1 x 2a+1 square)
1764 * - encoding: Set by user.
1765 * - decoding: unused
1767 int last_predictor_count;
1770 * prepass for motion estimation
1771 * - encoding: Set by user.
1772 * - decoding: unused
1777 * motion estimation prepass comparison function
1778 * - encoding: Set by user.
1779 * - decoding: unused
1784 * ME prepass diamond size & shape
1785 * - encoding: Set by user.
1786 * - decoding: unused
1792 * - encoding: Set by user.
1793 * - decoding: unused
1795 int me_subpel_quality;
1798 * DTG active format information (additional aspect ratio
1799 * information only used in DVB MPEG-2 transport streams)
1802 * - encoding: unused
1803 * - decoding: Set by decoder.
1805 int dtg_active_format;
1806 #define FF_DTG_AFD_SAME 8
1807 #define FF_DTG_AFD_4_3 9
1808 #define FF_DTG_AFD_16_9 10
1809 #define FF_DTG_AFD_14_9 11
1810 #define FF_DTG_AFD_4_3_SP_14_9 13
1811 #define FF_DTG_AFD_16_9_SP_14_9 14
1812 #define FF_DTG_AFD_SP_4_3 15
1815 * maximum motion estimation search range in subpel units
1816 * If 0 then no limit.
1818 * - encoding: Set by user.
1819 * - decoding: unused
1824 * intra quantizer bias
1825 * - encoding: Set by user.
1826 * - decoding: unused
1828 int intra_quant_bias;
1829 #define FF_DEFAULT_QUANT_BIAS 999999
1832 * inter quantizer bias
1833 * - encoding: Set by user.
1834 * - decoding: unused
1836 int inter_quant_bias;
1838 #if FF_API_COLOR_TABLE_ID
1841 * - encoding: unused
1842 * - decoding: Which clrtable should be used for 8bit RGB images.
1843 * Tables have to be stored somewhere. FIXME
1845 attribute_deprecated int color_table_id;
1850 * - encoding: unused
1851 * - decoding: Set by user.
1854 #define SLICE_FLAG_CODED_ORDER 0x0001 ///< draw_horiz_band() is called in coded order instead of display
1855 #define SLICE_FLAG_ALLOW_FIELD 0x0002 ///< allow draw_horiz_band() with field slices (MPEG2 field pics)
1856 #define SLICE_FLAG_ALLOW_PLANE 0x0004 ///< allow draw_horiz_band() with 1 component at a time (SVQ1)
1859 * XVideo Motion Acceleration
1860 * - encoding: forbidden
1861 * - decoding: set by decoder
1863 int xvmc_acceleration;
1866 * macroblock decision mode
1867 * - encoding: Set by user.
1868 * - decoding: unused
1871 #define FF_MB_DECISION_SIMPLE 0 ///< uses mb_cmp
1872 #define FF_MB_DECISION_BITS 1 ///< chooses the one which needs the fewest bits
1873 #define FF_MB_DECISION_RD 2 ///< rate distortion
1876 * custom intra quantization matrix
1877 * - encoding: Set by user, can be NULL.
1878 * - decoding: Set by libavcodec.
1880 uint16_t *intra_matrix;
1883 * custom inter quantization matrix
1884 * - encoding: Set by user, can be NULL.
1885 * - decoding: Set by libavcodec.
1887 uint16_t *inter_matrix;
1890 * scene change detection threshold
1891 * 0 is default, larger means fewer detected scene changes.
1892 * - encoding: Set by user.
1893 * - decoding: unused
1895 int scenechange_threshold;
1898 * noise reduction strength
1899 * - encoding: Set by user.
1900 * - decoding: unused
1902 int noise_reduction;
1904 #if FF_API_INTER_THRESHOLD
1906 * @deprecated this field is unused
1908 attribute_deprecated int inter_threshold;
1911 #if FF_API_MPV_GLOBAL_OPTS
1913 * @deprecated use mpegvideo private options instead
1915 attribute_deprecated int quantizer_noise_shaping;
1919 * Motion estimation threshold below which no motion estimation is
1920 * performed, but instead the user specified motion vectors are used.
1922 * - encoding: Set by user.
1923 * - decoding: unused
1928 * Macroblock threshold below which the user specified macroblock types will be used.
1929 * - encoding: Set by user.
1930 * - decoding: unused
1935 * precision of the intra DC coefficient - 8
1936 * - encoding: Set by user.
1937 * - decoding: unused
1939 int intra_dc_precision;
1942 * Number of macroblock rows at the top which are skipped.
1943 * - encoding: unused
1944 * - decoding: Set by user.
1949 * Number of macroblock rows at the bottom which are skipped.
1950 * - encoding: unused
1951 * - decoding: Set by user.
1956 * Border processing masking, raises the quantizer for mbs on the borders
1958 * - encoding: Set by user.
1959 * - decoding: unused
1961 float border_masking;
1964 * minimum MB lagrange multipler
1965 * - encoding: Set by user.
1966 * - decoding: unused
1971 * maximum MB lagrange multipler
1972 * - encoding: Set by user.
1973 * - decoding: unused
1979 * - encoding: Set by user.
1980 * - decoding: unused
1982 int me_penalty_compensation;
1986 * - encoding: Set by user.
1987 * - decoding: unused
1993 * - encoding: Set by user.
1994 * - decoding: unused
2000 * - encoding: Set by user.
2001 * - decoding: unused
2006 * number of reference frames
2007 * - encoding: Set by user.
2008 * - decoding: Set by lavc.
2013 * chroma qp offset from luma
2014 * - encoding: Set by user.
2015 * - decoding: unused
2020 * Multiplied by qscale for each frame and added to scene_change_score.
2021 * - encoding: Set by user.
2022 * - decoding: unused
2024 int scenechange_factor;
2028 * Note: Value depends upon the compare function used for fullpel ME.
2029 * - encoding: Set by user.
2030 * - decoding: unused
2035 * Adjust sensitivity of b_frame_strategy 1.
2036 * - encoding: Set by user.
2037 * - decoding: unused
2042 * Chromaticity coordinates of the source primaries.
2043 * - encoding: Set by user
2044 * - decoding: Set by libavcodec
2046 enum AVColorPrimaries color_primaries;
2049 * Color Transfer Characteristic.
2050 * - encoding: Set by user
2051 * - decoding: Set by libavcodec
2053 enum AVColorTransferCharacteristic color_trc;
2056 * YUV colorspace type.
2057 * - encoding: Set by user
2058 * - decoding: Set by libavcodec
2060 enum AVColorSpace colorspace;
2063 * MPEG vs JPEG YUV range.
2064 * - encoding: Set by user
2065 * - decoding: Set by libavcodec
2067 enum AVColorRange color_range;
2070 * This defines the location of chroma samples.
2071 * - encoding: Set by user
2072 * - decoding: Set by libavcodec
2074 enum AVChromaLocation chroma_sample_location;
2078 * Indicates number of picture subdivisions. Used for parallelized
2080 * - encoding: Set by user
2081 * - decoding: unused
2086 * - encoding: set by libavcodec
2087 * - decoding: Set by libavcodec
2089 enum AVFieldOrder field_order;
2092 int sample_rate; ///< samples per second
2093 int channels; ///< number of audio channels
2096 * audio sample format
2097 * - encoding: Set by user.
2098 * - decoding: Set by libavcodec.
2100 enum AVSampleFormat sample_fmt; ///< sample format
2102 /* The following data should not be initialized. */
2104 * Samples per packet, initialized when calling 'init'.
2109 * Frame counter, set by libavcodec.
2111 * - decoding: total number of frames returned from the decoder so far.
2112 * - encoding: total number of frames passed to the encoder so far.
2114 * @note the counter is not incremented if encoding/decoding resulted in
2120 * number of bytes per packet if constant and known or 0
2121 * Used by some WAV based audio codecs.
2126 * Audio cutoff bandwidth (0 means "automatic")
2127 * - encoding: Set by user.
2128 * - decoding: unused
2132 #if FF_API_REQUEST_CHANNELS
2134 * Decoder should decode to this many channels if it can (0 for default)
2135 * - encoding: unused
2136 * - decoding: Set by user.
2137 * @deprecated Deprecated in favor of request_channel_layout.
2139 int request_channels;
2143 * Audio channel layout.
2144 * - encoding: set by user.
2145 * - decoding: set by user, may be overwritten by libavcodec.
2147 uint64_t channel_layout;
2150 * Request decoder to use this channel layout if it can (0 for default)
2151 * - encoding: unused
2152 * - decoding: Set by user.
2154 uint64_t request_channel_layout;
2157 * Type of service that the audio stream conveys.
2158 * - encoding: Set by user.
2159 * - decoding: Set by libavcodec.
2161 enum AVAudioServiceType audio_service_type;
2164 * desired sample format
2165 * - encoding: Not used.
2166 * - decoding: Set by user.
2167 * Decoder will decode to this format if it can.
2169 enum AVSampleFormat request_sample_fmt;
2172 * Called at the beginning of each frame to get a buffer for it.
2174 * The function will set AVFrame.data[], AVFrame.linesize[].
2175 * AVFrame.extended_data[] must also be set, but it should be the same as
2176 * AVFrame.data[] except for planar audio with more channels than can fit
2177 * in AVFrame.data[]. In that case, AVFrame.data[] shall still contain as
2178 * many data pointers as it can hold.
2180 * if CODEC_CAP_DR1 is not set then get_buffer() must call
2181 * avcodec_default_get_buffer() instead of providing buffers allocated by
2184 * AVFrame.data[] should be 32- or 16-byte-aligned unless the CPU doesn't
2185 * need it. avcodec_default_get_buffer() aligns the output buffer properly,
2186 * but if get_buffer() is overridden then alignment considerations should
2187 * be taken into account.
2189 * @see avcodec_default_get_buffer()
2193 * If pic.reference is set then the frame will be read later by libavcodec.
2194 * avcodec_align_dimensions2() should be used to find the required width and
2195 * height, as they normally need to be rounded up to the next multiple of 16.
2197 * If frame multithreading is used and thread_safe_callbacks is set,
2198 * it may be called from a different thread, but not from more than one at
2199 * once. Does not need to be reentrant.
2201 * @see release_buffer(), reget_buffer()
2202 * @see avcodec_align_dimensions2()
2206 * Decoders request a buffer of a particular size by setting
2207 * AVFrame.nb_samples prior to calling get_buffer(). The decoder may,
2208 * however, utilize only part of the buffer by setting AVFrame.nb_samples
2209 * to a smaller value in the output frame.
2211 * Decoders cannot use the buffer after returning from
2212 * avcodec_decode_audio4(), so they will not call release_buffer(), as it
2213 * is assumed to be released immediately upon return.
2215 * As a convenience, av_samples_get_buffer_size() and
2216 * av_samples_fill_arrays() in libavutil may be used by custom get_buffer()
2217 * functions to find the required data size and to fill data pointers and
2218 * linesize. In AVFrame.linesize, only linesize[0] may be set for audio
2219 * since all planes must be the same size.
2221 * @see av_samples_get_buffer_size(), av_samples_fill_arrays()
2223 * - encoding: unused
2224 * - decoding: Set by libavcodec, user can override.
2226 int (*get_buffer)(struct AVCodecContext *c, AVFrame *pic);
2229 * Called to release buffers which were allocated with get_buffer.
2230 * A released buffer can be reused in get_buffer().
2231 * pic.data[*] must be set to NULL.
2232 * May be called from a different thread if frame multithreading is used,
2233 * but not by more than one thread at once, so does not need to be reentrant.
2234 * - encoding: unused
2235 * - decoding: Set by libavcodec, user can override.
2237 void (*release_buffer)(struct AVCodecContext *c, AVFrame *pic);
2240 * Called at the beginning of a frame to get cr buffer for it.
2241 * Buffer type (size, hints) must be the same. libavcodec won't check it.
2242 * libavcodec will pass previous buffer in pic, function should return
2243 * same buffer or new buffer with old frame "painted" into it.
2244 * If pic.data[0] == NULL must behave like get_buffer().
2245 * if CODEC_CAP_DR1 is not set then reget_buffer() must call
2246 * avcodec_default_reget_buffer() instead of providing buffers allocated by
2248 * - encoding: unused
2249 * - decoding: Set by libavcodec, user can override.
2251 int (*reget_buffer)(struct AVCodecContext *c, AVFrame *pic);
2254 /* - encoding parameters */
2255 float qcompress; ///< amount of qscale change between easy & hard scenes (0.0-1.0)
2256 float qblur; ///< amount of qscale smoothing over time (0.0-1.0)
2260 * - encoding: Set by user.
2261 * - decoding: unused
2267 * - encoding: Set by user.
2268 * - decoding: unused
2273 * maximum quantizer difference between frames
2274 * - encoding: Set by user.
2275 * - decoding: unused
2280 * ratecontrol qmin qmax limiting method
2281 * 0-> clipping, 1-> use a nice continous function to limit qscale wthin qmin/qmax.
2282 * - encoding: Set by user.
2283 * - decoding: unused
2291 * decoder bitstream buffer size
2292 * - encoding: Set by user.
2293 * - decoding: unused
2298 * ratecontrol override, see RcOverride
2299 * - encoding: Allocated/set/freed by user.
2300 * - decoding: unused
2302 int rc_override_count;
2303 RcOverride *rc_override;
2306 * rate control equation
2307 * - encoding: Set by user
2308 * - decoding: unused
2314 * - encoding: Set by user.
2315 * - decoding: unused
2321 * - encoding: Set by user.
2322 * - decoding: unused
2326 float rc_buffer_aggressivity;
2329 * initial complexity for pass1 ratecontrol
2330 * - encoding: Set by user.
2331 * - decoding: unused
2333 float rc_initial_cplx;
2336 * Ratecontrol attempt to use, at maximum, <value> of what can be used without an underflow.
2337 * - encoding: Set by user.
2338 * - decoding: unused.
2340 float rc_max_available_vbv_use;
2343 * Ratecontrol attempt to use, at least, <value> times the amount needed to prevent a vbv overflow.
2344 * - encoding: Set by user.
2345 * - decoding: unused.
2347 float rc_min_vbv_overflow_use;
2350 * Number of bits which should be loaded into the rc buffer before decoding starts.
2351 * - encoding: Set by user.
2352 * - decoding: unused
2354 int rc_initial_buffer_occupancy;
2356 #define FF_CODER_TYPE_VLC 0
2357 #define FF_CODER_TYPE_AC 1
2358 #define FF_CODER_TYPE_RAW 2
2359 #define FF_CODER_TYPE_RLE 3
2360 #define FF_CODER_TYPE_DEFLATE 4
2363 * - encoding: Set by user.
2364 * - decoding: unused
2370 * - encoding: Set by user.
2371 * - decoding: unused
2376 * minimum Lagrange multipler
2377 * - encoding: Set by user.
2378 * - decoding: unused
2383 * maximum Lagrange multipler
2384 * - encoding: Set by user.
2385 * - decoding: unused
2390 * frame skip threshold
2391 * - encoding: Set by user.
2392 * - decoding: unused
2394 int frame_skip_threshold;
2398 * - encoding: Set by user.
2399 * - decoding: unused
2401 int frame_skip_factor;
2404 * frame skip exponent
2405 * - encoding: Set by user.
2406 * - decoding: unused
2411 * frame skip comparison function
2412 * - encoding: Set by user.
2413 * - decoding: unused
2418 * trellis RD quantization
2419 * - encoding: Set by user.
2420 * - decoding: unused
2425 * - encoding: Set by user.
2426 * - decoding: unused
2428 int min_prediction_order;
2431 * - encoding: Set by user.
2432 * - decoding: unused
2434 int max_prediction_order;
2437 * GOP timecode frame start number
2438 * - encoding: Set by user, in non drop frame format
2439 * - decoding: Set by libavcodec (timecode in the 25 bits format, -1 if unset)
2441 int64_t timecode_frame_start;
2443 /* The RTP callback: This function is called */
2444 /* every time the encoder has a packet to send. */
2445 /* It depends on the encoder if the data starts */
2446 /* with a Start Code (it should). H.263 does. */
2447 /* mb_nb contains the number of macroblocks */
2448 /* encoded in the RTP payload. */
2449 void (*rtp_callback)(struct AVCodecContext *avctx, void *data, int size, int mb_nb);
2451 int rtp_payload_size; /* The size of the RTP payload: the coder will */
2452 /* do its best to deliver a chunk with size */
2453 /* below rtp_payload_size, the chunk will start */
2454 /* with a start code on some codecs like H.263. */
2455 /* This doesn't take account of any particular */
2456 /* headers inside the transmitted RTP payload. */
2458 /* statistics, used for 2-pass encoding */
2469 * number of bits used for the previously encoded frame
2470 * - encoding: Set by libavcodec.
2471 * - decoding: unused
2476 * pass1 encoding statistics output buffer
2477 * - encoding: Set by libavcodec.
2478 * - decoding: unused
2483 * pass2 encoding statistics input buffer
2484 * Concatenated stuff from stats_out of pass1 should be placed here.
2485 * - encoding: Allocated/set/freed by user.
2486 * - decoding: unused
2491 * Work around bugs in encoders which sometimes cannot be detected automatically.
2492 * - encoding: Set by user
2493 * - decoding: Set by user
2495 int workaround_bugs;
2496 #define FF_BUG_AUTODETECT 1 ///< autodetection
2497 #define FF_BUG_OLD_MSMPEG4 2
2498 #define FF_BUG_XVID_ILACE 4
2499 #define FF_BUG_UMP4 8
2500 #define FF_BUG_NO_PADDING 16
2501 #define FF_BUG_AMV 32
2502 #define FF_BUG_AC_VLC 0 ///< Will be removed, libavcodec can now handle these non-compliant files by default.
2503 #define FF_BUG_QPEL_CHROMA 64
2504 #define FF_BUG_STD_QPEL 128
2505 #define FF_BUG_QPEL_CHROMA2 256
2506 #define FF_BUG_DIRECT_BLOCKSIZE 512
2507 #define FF_BUG_EDGE 1024
2508 #define FF_BUG_HPEL_CHROMA 2048
2509 #define FF_BUG_DC_CLIP 4096
2510 #define FF_BUG_MS 8192 ///< Work around various bugs in Microsoft's broken decoders.
2511 #define FF_BUG_TRUNCATED 16384
2514 * strictly follow the standard (MPEG4, ...).
2515 * - encoding: Set by user.
2516 * - decoding: Set by user.
2517 * Setting this to STRICT or higher means the encoder and decoder will
2518 * generally do stupid things, whereas setting it to unofficial or lower
2519 * will mean the encoder might produce output that is not supported by all
2520 * spec-compliant decoders. Decoders don't differentiate between normal,
2521 * unofficial and experimental (that is, they always try to decode things
2522 * when they can) unless they are explicitly asked to behave stupidly
2523 * (=strictly conform to the specs)
2525 int strict_std_compliance;
2526 #define FF_COMPLIANCE_VERY_STRICT 2 ///< Strictly conform to an older more strict version of the spec or reference software.
2527 #define FF_COMPLIANCE_STRICT 1 ///< Strictly conform to all the things in the spec no matter what consequences.
2528 #define FF_COMPLIANCE_NORMAL 0
2529 #define FF_COMPLIANCE_UNOFFICIAL -1 ///< Allow unofficial extensions
2530 #define FF_COMPLIANCE_EXPERIMENTAL -2 ///< Allow nonstandardized experimental things.
2533 * error concealment flags
2534 * - encoding: unused
2535 * - decoding: Set by user.
2537 int error_concealment;
2538 #define FF_EC_GUESS_MVS 1
2539 #define FF_EC_DEBLOCK 2
2543 * - encoding: Set by user.
2544 * - decoding: Set by user.
2547 #define FF_DEBUG_PICT_INFO 1
2548 #define FF_DEBUG_RC 2
2549 #define FF_DEBUG_BITSTREAM 4
2550 #define FF_DEBUG_MB_TYPE 8
2551 #define FF_DEBUG_QP 16
2552 #define FF_DEBUG_MV 32
2553 #define FF_DEBUG_DCT_COEFF 0x00000040
2554 #define FF_DEBUG_SKIP 0x00000080
2555 #define FF_DEBUG_STARTCODE 0x00000100
2556 #define FF_DEBUG_PTS 0x00000200
2557 #define FF_DEBUG_ER 0x00000400
2558 #define FF_DEBUG_MMCO 0x00000800
2559 #define FF_DEBUG_BUGS 0x00001000
2560 #define FF_DEBUG_VIS_QP 0x00002000
2561 #define FF_DEBUG_VIS_MB_TYPE 0x00004000
2562 #define FF_DEBUG_BUFFERS 0x00008000
2563 #define FF_DEBUG_THREADS 0x00010000
2567 * - encoding: Set by user.
2568 * - decoding: Set by user.
2571 #define FF_DEBUG_VIS_MV_P_FOR 0x00000001 //visualize forward predicted MVs of P frames
2572 #define FF_DEBUG_VIS_MV_B_FOR 0x00000002 //visualize forward predicted MVs of B frames
2573 #define FF_DEBUG_VIS_MV_B_BACK 0x00000004 //visualize backward predicted MVs of B frames
2576 * Error recognition; may misdetect some more or less valid parts as errors.
2577 * - encoding: unused
2578 * - decoding: Set by user.
2580 int err_recognition;
2581 #define AV_EF_CRCCHECK (1<<0)
2582 #define AV_EF_BITSTREAM (1<<1)
2583 #define AV_EF_BUFFER (1<<2)
2584 #define AV_EF_EXPLODE (1<<3)
2586 #define AV_EF_CAREFUL (1<<16)
2587 #define AV_EF_COMPLIANT (1<<17)
2588 #define AV_EF_AGGRESSIVE (1<<18)
2592 * opaque 64bit number (generally a PTS) that will be reordered and
2593 * output in AVFrame.reordered_opaque
2594 * @deprecated in favor of pkt_pts
2595 * - encoding: unused
2596 * - decoding: Set by user.
2598 int64_t reordered_opaque;
2601 * Hardware accelerator in use
2602 * - encoding: unused.
2603 * - decoding: Set by libavcodec
2605 struct AVHWAccel *hwaccel;
2608 * Hardware accelerator context.
2609 * For some hardware accelerators, a global context needs to be
2610 * provided by the user. In that case, this holds display-dependent
2611 * data FFmpeg cannot instantiate itself. Please refer to the
2612 * FFmpeg HW accelerator documentation to know how to fill this
2613 * is. e.g. for VA API, this is a struct vaapi_context.
2614 * - encoding: unused
2615 * - decoding: Set by user
2617 void *hwaccel_context;
2621 * - encoding: Set by libavcodec if flags&CODEC_FLAG_PSNR.
2622 * - decoding: unused
2624 uint64_t error[AV_NUM_DATA_POINTERS];
2627 * DCT algorithm, see FF_DCT_* below
2628 * - encoding: Set by user.
2629 * - decoding: unused
2632 #define FF_DCT_AUTO 0
2633 #define FF_DCT_FASTINT 1
2634 #define FF_DCT_INT 2
2635 #define FF_DCT_MMX 3
2636 #define FF_DCT_ALTIVEC 5
2637 #define FF_DCT_FAAN 6
2640 * IDCT algorithm, see FF_IDCT_* below.
2641 * - encoding: Set by user.
2642 * - decoding: Set by user.
2645 #define FF_IDCT_AUTO 0
2646 #define FF_IDCT_INT 1
2647 #define FF_IDCT_SIMPLE 2
2648 #define FF_IDCT_SIMPLEMMX 3
2649 #define FF_IDCT_LIBMPEG2MMX 4
2650 #define FF_IDCT_MMI 5
2651 #define FF_IDCT_ARM 7
2652 #define FF_IDCT_ALTIVEC 8
2653 #define FF_IDCT_SH4 9
2654 #define FF_IDCT_SIMPLEARM 10
2655 #define FF_IDCT_H264 11
2656 #define FF_IDCT_VP3 12
2657 #define FF_IDCT_IPP 13
2658 #define FF_IDCT_XVIDMMX 14
2659 #define FF_IDCT_CAVS 15
2660 #define FF_IDCT_SIMPLEARMV5TE 16
2661 #define FF_IDCT_SIMPLEARMV6 17
2662 #define FF_IDCT_SIMPLEVIS 18
2663 #define FF_IDCT_WMV2 19
2664 #define FF_IDCT_FAAN 20
2665 #define FF_IDCT_EA 21
2666 #define FF_IDCT_SIMPLENEON 22
2667 #define FF_IDCT_SIMPLEALPHA 23
2668 #define FF_IDCT_BINK 24
2673 * @deprecated use av_set_cpu_flags_mask() instead.
2675 attribute_deprecated unsigned dsp_mask;
2679 * bits per sample/pixel from the demuxer (needed for huffyuv).
2680 * - encoding: Set by libavcodec.
2681 * - decoding: Set by user.
2683 int bits_per_coded_sample;
2686 * Bits per sample/pixel of internal libavcodec pixel/sample format.
2687 * - encoding: set by user.
2688 * - decoding: set by libavcodec.
2690 int bits_per_raw_sample;
2693 * low resolution decoding, 1-> 1/2 size, 2->1/4 size
2694 * - encoding: unused
2695 * - decoding: Set by user.
2700 * the picture in the bitstream
2701 * - encoding: Set by libavcodec.
2702 * - decoding: Set by libavcodec.
2704 AVFrame *coded_frame;
2708 * is used to decide how many independent tasks should be passed to execute()
2709 * - encoding: Set by user.
2710 * - decoding: Set by user.
2715 * Which multithreading methods to use.
2716 * Use of FF_THREAD_FRAME will increase decoding delay by one frame per thread,
2717 * so clients which cannot provide future frames should not use it.
2719 * - encoding: Set by user, otherwise the default is used.
2720 * - decoding: Set by user, otherwise the default is used.
2723 #define FF_THREAD_FRAME 1 ///< Decode more than one frame at once
2724 #define FF_THREAD_SLICE 2 ///< Decode more than one part of a single frame at once
2727 * Which multithreading methods are in use by the codec.
2728 * - encoding: Set by libavcodec.
2729 * - decoding: Set by libavcodec.
2731 int active_thread_type;
2734 * Set by the client if its custom get_buffer() callback can be called
2735 * synchronously from another thread, which allows faster multithreaded decoding.
2736 * draw_horiz_band() will be called from other threads regardless of this setting.
2737 * Ignored if the default get_buffer() is used.
2738 * - encoding: Set by user.
2739 * - decoding: Set by user.
2741 int thread_safe_callbacks;
2744 * The codec may call this to execute several independent things.
2745 * It will return only after finishing all tasks.
2746 * The user may replace this with some multithreaded implementation,
2747 * the default implementation will execute the parts serially.
2748 * @param count the number of things to execute
2749 * - encoding: Set by libavcodec, user can override.
2750 * - decoding: Set by libavcodec, user can override.
2752 int (*execute)(struct AVCodecContext *c, int (*func)(struct AVCodecContext *c2, void *arg), void *arg2, int *ret, int count, int size);
2755 * The codec may call this to execute several independent things.
2756 * It will return only after finishing all tasks.
2757 * The user may replace this with some multithreaded implementation,
2758 * the default implementation will execute the parts serially.
2759 * Also see avcodec_thread_init and e.g. the --enable-pthread configure option.
2760 * @param c context passed also to func
2761 * @param count the number of things to execute
2762 * @param arg2 argument passed unchanged to func
2763 * @param ret return values of executed functions, must have space for "count" values. May be NULL.
2764 * @param func function that will be called count times, with jobnr from 0 to count-1.
2765 * threadnr will be in the range 0 to c->thread_count-1 < MAX_THREADS and so that no
2766 * two instances of func executing at the same time will have the same threadnr.
2767 * @return always 0 currently, but code should handle a future improvement where when any call to func
2768 * returns < 0 no further calls to func may be done and < 0 is returned.
2769 * - encoding: Set by libavcodec, user can override.
2770 * - decoding: Set by libavcodec, user can override.
2772 int (*execute2)(struct AVCodecContext *c, int (*func)(struct AVCodecContext *c2, void *arg, int jobnr, int threadnr), void *arg2, int *ret, int count);
2776 * Can be used by execute() to store some per AVCodecContext stuff.
2777 * - encoding: set by execute()
2778 * - decoding: set by execute()
2780 void *thread_opaque;
2783 * noise vs. sse weight for the nsse comparsion function
2784 * - encoding: Set by user.
2785 * - decoding: unused
2791 * - encoding: Set by user.
2792 * - decoding: Set by libavcodec.
2795 #define FF_PROFILE_UNKNOWN -99
2796 #define FF_PROFILE_RESERVED -100
2798 #define FF_PROFILE_AAC_MAIN 0
2799 #define FF_PROFILE_AAC_LOW 1
2800 #define FF_PROFILE_AAC_SSR 2
2801 #define FF_PROFILE_AAC_LTP 3
2803 #define FF_PROFILE_DTS 20
2804 #define FF_PROFILE_DTS_ES 30
2805 #define FF_PROFILE_DTS_96_24 40
2806 #define FF_PROFILE_DTS_HD_HRA 50
2807 #define FF_PROFILE_DTS_HD_MA 60
2809 #define FF_PROFILE_MPEG2_422 0
2810 #define FF_PROFILE_MPEG2_HIGH 1
2811 #define FF_PROFILE_MPEG2_SS 2
2812 #define FF_PROFILE_MPEG2_SNR_SCALABLE 3
2813 #define FF_PROFILE_MPEG2_MAIN 4
2814 #define FF_PROFILE_MPEG2_SIMPLE 5
2816 #define FF_PROFILE_H264_CONSTRAINED (1<<9) // 8+1; constraint_set1_flag
2817 #define FF_PROFILE_H264_INTRA (1<<11) // 8+3; constraint_set3_flag
2819 #define FF_PROFILE_H264_BASELINE 66
2820 #define FF_PROFILE_H264_CONSTRAINED_BASELINE (66|FF_PROFILE_H264_CONSTRAINED)
2821 #define FF_PROFILE_H264_MAIN 77
2822 #define FF_PROFILE_H264_EXTENDED 88
2823 #define FF_PROFILE_H264_HIGH 100
2824 #define FF_PROFILE_H264_HIGH_10 110
2825 #define FF_PROFILE_H264_HIGH_10_INTRA (110|FF_PROFILE_H264_INTRA)
2826 #define FF_PROFILE_H264_HIGH_422 122
2827 #define FF_PROFILE_H264_HIGH_422_INTRA (122|FF_PROFILE_H264_INTRA)
2828 #define FF_PROFILE_H264_HIGH_444 144
2829 #define FF_PROFILE_H264_HIGH_444_PREDICTIVE 244
2830 #define FF_PROFILE_H264_HIGH_444_INTRA (244|FF_PROFILE_H264_INTRA)
2831 #define FF_PROFILE_H264_CAVLC_444 44
2833 #define FF_PROFILE_VC1_SIMPLE 0
2834 #define FF_PROFILE_VC1_MAIN 1
2835 #define FF_PROFILE_VC1_COMPLEX 2
2836 #define FF_PROFILE_VC1_ADVANCED 3
2838 #define FF_PROFILE_MPEG4_SIMPLE 0
2839 #define FF_PROFILE_MPEG4_SIMPLE_SCALABLE 1
2840 #define FF_PROFILE_MPEG4_CORE 2
2841 #define FF_PROFILE_MPEG4_MAIN 3
2842 #define FF_PROFILE_MPEG4_N_BIT 4
2843 #define FF_PROFILE_MPEG4_SCALABLE_TEXTURE 5
2844 #define FF_PROFILE_MPEG4_SIMPLE_FACE_ANIMATION 6
2845 #define FF_PROFILE_MPEG4_BASIC_ANIMATED_TEXTURE 7
2846 #define FF_PROFILE_MPEG4_HYBRID 8
2847 #define FF_PROFILE_MPEG4_ADVANCED_REAL_TIME 9
2848 #define FF_PROFILE_MPEG4_CORE_SCALABLE 10
2849 #define FF_PROFILE_MPEG4_ADVANCED_CODING 11
2850 #define FF_PROFILE_MPEG4_ADVANCED_CORE 12
2851 #define FF_PROFILE_MPEG4_ADVANCED_SCALABLE_TEXTURE 13
2852 #define FF_PROFILE_MPEG4_SIMPLE_STUDIO 14
2853 #define FF_PROFILE_MPEG4_ADVANCED_SIMPLE 15
2857 * - encoding: Set by user.
2858 * - decoding: Set by libavcodec.
2861 #define FF_LEVEL_UNKNOWN -99
2865 * - encoding: unused
2866 * - decoding: Set by user.
2868 enum AVDiscard skip_loop_filter;
2872 * - encoding: unused
2873 * - decoding: Set by user.
2875 enum AVDiscard skip_idct;
2879 * - encoding: unused
2880 * - decoding: Set by user.
2882 enum AVDiscard skip_frame;
2885 * Header containing style information for text subtitles.
2886 * For SUBTITLE_ASS subtitle type, it should contain the whole ASS
2887 * [Script Info] and [V4+ Styles] section, plus the [Events] line and
2888 * the Format line following. It shouldn't include any Dialogue line.
2889 * - encoding: Set/allocated/freed by user (before avcodec_open2())
2890 * - decoding: Set/allocated/freed by libavcodec (by avcodec_open2())
2892 uint8_t *subtitle_header;
2893 int subtitle_header_size;
2896 * Simulates errors in the bitstream to test error concealment.
2897 * - encoding: Set by user.
2898 * - decoding: unused
2903 * Current packet as passed into the decoder, to avoid having
2904 * to pass the packet into every function. Currently only valid
2905 * inside lavc and get/release_buffer callbacks.
2906 * - decoding: set by avcodec_decode_*, read by get_buffer() for setting pkt_pts
2907 * - encoding: unused
2912 * VBV delay coded in the last frame (in periods of a 27 MHz clock).
2913 * Used for compliant TS muxing.
2914 * - encoding: Set by libavcodec.
2915 * - decoding: unused.
2920 * Current statistics for PTS correction.
2921 * - decoding: maintained and used by libavcodec, not intended to be used by user apps
2922 * - encoding: unused
2924 int64_t pts_correction_num_faulty_pts; /// Number of incorrect PTS values so far
2925 int64_t pts_correction_num_faulty_dts; /// Number of incorrect DTS values so far
2926 int64_t pts_correction_last_pts; /// PTS of the last frame
2927 int64_t pts_correction_last_dts; /// DTS of the last frame
2933 typedef struct AVProfile {
2935 const char *name; ///< short name for the profile
2938 typedef struct AVCodecDefault AVCodecDefault;
2943 typedef struct AVCodec {
2945 * Name of the codec implementation.
2946 * The name is globally unique among encoders and among decoders (but an
2947 * encoder and a decoder can share the same name).
2948 * This is the primary way to find a codec from the user perspective.
2952 * Descriptive name for the codec, meant to be more human readable than name.
2953 * You should use the NULL_IF_CONFIG_SMALL() macro to define it.
2955 const char *long_name;
2956 enum AVMediaType type;
2959 * Codec capabilities.
2963 const AVRational *supported_framerates; ///< array of supported framerates, or NULL if any, array is terminated by {0,0}
2964 const enum PixelFormat *pix_fmts; ///< array of supported pixel formats, or NULL if unknown, array is terminated by -1
2965 const int *supported_samplerates; ///< array of supported audio samplerates, or NULL if unknown, array is terminated by 0
2966 const enum AVSampleFormat *sample_fmts; ///< array of supported sample formats, or NULL if unknown, array is terminated by -1
2967 const uint64_t *channel_layouts; ///< array of support channel layouts, or NULL if unknown. array is terminated by 0
2968 uint8_t max_lowres; ///< maximum value for lowres supported by the decoder
2969 const AVClass *priv_class; ///< AVClass for the private context
2970 const AVProfile *profiles; ///< array of recognized profiles, or NULL if unknown, array is terminated by {FF_PROFILE_UNKNOWN}
2972 /*****************************************************************
2973 * No fields below this line are part of the public API. They
2974 * may not be used outside of libavcodec and can be changed and
2976 * New public fields should be added right above.
2977 *****************************************************************
2980 struct AVCodec *next;
2982 * @name Frame-level threading support functions
2986 * If defined, called on thread contexts when they are created.
2987 * If the codec allocates writable tables in init(), re-allocate them here.
2988 * priv_data will be set to a copy of the original.
2990 int (*init_thread_copy)(AVCodecContext *);
2992 * Copy necessary context variables from a previous thread context to the current one.
2993 * If not defined, the next thread will start automatically; otherwise, the codec
2994 * must call ff_thread_finish_setup().
2996 * dst and src will (rarely) point to the same context, in which case memcpy should be skipped.
2998 int (*update_thread_context)(AVCodecContext *dst, const AVCodecContext *src);
3002 * Private codec-specific defaults.
3004 const AVCodecDefault *defaults;
3007 * Initialize codec static data, called from avcodec_register().
3009 void (*init_static_data)(struct AVCodec *codec);
3011 int (*init)(AVCodecContext *);
3012 int (*encode)(AVCodecContext *, uint8_t *buf, int buf_size, void *data);
3014 * Encode data to an AVPacket.
3016 * @param avctx codec context
3017 * @param avpkt output AVPacket (may contain a user-provided buffer)
3018 * @param[in] frame AVFrame containing the raw data to be encoded
3019 * @param[out] got_packet_ptr encoder sets to 0 or 1 to indicate that a
3020 * non-empty packet was returned in avpkt.
3021 * @return 0 on success, negative error code on failure
3023 int (*encode2)(AVCodecContext *avctx, AVPacket *avpkt, const AVFrame *frame,
3024 int *got_packet_ptr);
3025 int (*decode)(AVCodecContext *, void *outdata, int *outdata_size, AVPacket *avpkt);
3026 int (*close)(AVCodecContext *);
3029 * Will be called when seeking
3031 void (*flush)(AVCodecContext *);
3037 typedef struct AVHWAccel {
3039 * Name of the hardware accelerated codec.
3040 * The name is globally unique among encoders and among decoders (but an
3041 * encoder and a decoder can share the same name).
3046 * Type of codec implemented by the hardware accelerator.
3048 * See AVMEDIA_TYPE_xxx
3050 enum AVMediaType type;
3053 * Codec implemented by the hardware accelerator.
3060 * Supported pixel format.
3062 * Only hardware accelerated formats are supported here.
3064 enum PixelFormat pix_fmt;
3067 * Hardware accelerated codec capabilities.
3068 * see FF_HWACCEL_CODEC_CAP_*
3072 struct AVHWAccel *next;
3075 * Called at the beginning of each frame or field picture.
3077 * Meaningful frame information (codec specific) is guaranteed to
3078 * be parsed at this point. This function is mandatory.
3080 * Note that buf can be NULL along with buf_size set to 0.
3081 * Otherwise, this means the whole frame is available at this point.
3083 * @param avctx the codec context
3084 * @param buf the frame data buffer base
3085 * @param buf_size the size of the frame in bytes
3086 * @return zero if successful, a negative value otherwise
3088 int (*start_frame)(AVCodecContext *avctx, const uint8_t *buf, uint32_t buf_size);
3091 * Callback for each slice.
3093 * Meaningful slice information (codec specific) is guaranteed to
3094 * be parsed at this point. This function is mandatory.
3096 * @param avctx the codec context
3097 * @param buf the slice data buffer base
3098 * @param buf_size the size of the slice in bytes
3099 * @return zero if successful, a negative value otherwise
3101 int (*decode_slice)(AVCodecContext *avctx, const uint8_t *buf, uint32_t buf_size);
3104 * Called at the end of each frame or field picture.
3106 * The whole picture is parsed at this point and can now be sent
3107 * to the hardware accelerator. This function is mandatory.
3109 * @param avctx the codec context
3110 * @return zero if successful, a negative value otherwise
3112 int (*end_frame)(AVCodecContext *avctx);
3115 * Size of HW accelerator private data.
3117 * Private data is allocated with av_mallocz() before
3118 * AVCodecContext.get_buffer() and deallocated after
3119 * AVCodecContext.release_buffer().
3125 * @defgroup lavc_picture AVPicture
3127 * Functions for working with AVPicture
3132 * four components are given, that's all.
3133 * the last component is alpha
3135 typedef struct AVPicture {
3136 uint8_t *data[AV_NUM_DATA_POINTERS];
3137 int linesize[AV_NUM_DATA_POINTERS]; ///< number of bytes per line
3144 enum AVSubtitleType {
3147 SUBTITLE_BITMAP, ///< A bitmap, pict will be set
3150 * Plain text, the text field must be set by the decoder and is
3151 * authoritative. ass and pict fields may contain approximations.
3156 * Formatted text, the ass field must be set by the decoder and is
3157 * authoritative. pict and text fields may contain approximations.
3162 typedef struct AVSubtitleRect {
3163 int x; ///< top left corner of pict, undefined when pict is not set
3164 int y; ///< top left corner of pict, undefined when pict is not set
3165 int w; ///< width of pict, undefined when pict is not set
3166 int h; ///< height of pict, undefined when pict is not set
3167 int nb_colors; ///< number of colors in pict, undefined when pict is not set
3170 * data+linesize for the bitmap of this subtitle.
3171 * can be set for text/ass as well once they where rendered
3174 enum AVSubtitleType type;
3176 char *text; ///< 0 terminated plain UTF-8 text
3179 * 0 terminated ASS/SSA compatible event line.
3180 * The pressentation of this is unaffected by the other values in this
3186 * 1 indicates this subtitle is a forced subtitle.
3187 * A forced subtitle should be displayed even when subtitles are hidden.
3192 typedef struct AVSubtitle {
3193 uint16_t format; /* 0 = graphics */
3194 uint32_t start_display_time; /* relative to packet pts, in ms */
3195 uint32_t end_display_time; /* relative to packet pts, in ms */
3197 AVSubtitleRect **rects;
3198 int64_t pts; ///< Same as packet pts, in AV_TIME_BASE
3202 * If c is NULL, returns the first registered codec,
3203 * if c is non-NULL, returns the next registered codec after c,
3204 * or NULL if c is the last one.
3206 AVCodec *av_codec_next(AVCodec *c);
3209 * Return the LIBAVCODEC_VERSION_INT constant.
3211 unsigned avcodec_version(void);
3214 * Return the libavcodec build-time configuration.
3216 const char *avcodec_configuration(void);
3219 * Return the libavcodec license.
3221 const char *avcodec_license(void);
3224 * Register the codec codec and initialize libavcodec.
3226 * @warning either this function or avcodec_register_all() must be called
3227 * before any other libavcodec functions.
3229 * @see avcodec_register_all()
3231 void avcodec_register(AVCodec *codec);
3234 * Register all the codecs, parsers and bitstream filters which were enabled at
3235 * configuration time. If you do not call this function you can select exactly
3236 * which formats you want to support, by using the individual registration
3239 * @see avcodec_register
3240 * @see av_register_codec_parser
3241 * @see av_register_bitstream_filter
3243 void avcodec_register_all(void);
3246 #if FF_API_ALLOC_CONTEXT
3248 * Allocate an AVCodecContext and set its fields to default values. The
3249 * resulting struct can be deallocated by simply calling av_free().
3251 * @return An AVCodecContext filled with default values or NULL on failure.
3252 * @see avcodec_get_context_defaults
3254 * @deprecated use avcodec_alloc_context3()
3256 attribute_deprecated
3257 AVCodecContext *avcodec_alloc_context(void);
3259 /** THIS FUNCTION IS NOT YET PART OF THE PUBLIC API!
3260 * we WILL change its arguments and name a few times! */
3261 attribute_deprecated
3262 AVCodecContext *avcodec_alloc_context2(enum AVMediaType);
3265 * Set the fields of the given AVCodecContext to default values.
3267 * @param s The AVCodecContext of which the fields should be set to default values.
3268 * @deprecated use avcodec_get_context_defaults3
3270 attribute_deprecated
3271 void avcodec_get_context_defaults(AVCodecContext *s);
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 void avcodec_get_context_defaults2(AVCodecContext *s, enum AVMediaType);
3280 * Allocate an AVCodecContext and set its fields to default values. The
3281 * resulting struct can be deallocated by calling avcodec_close() on it followed
3284 * @param codec if non-NULL, allocate private data and initialize defaults
3285 * for the given codec. It is illegal to then call avcodec_open2()
3286 * with a different codec.
3287 * If NULL, then the codec-specific defaults won't be initialized,
3288 * which may result in suboptimal default settings (this is
3289 * important mainly for encoders, e.g. libx264).
3291 * @return An AVCodecContext filled with default values or NULL on failure.
3292 * @see avcodec_get_context_defaults
3294 AVCodecContext *avcodec_alloc_context3(AVCodec *codec);
3297 * Set the fields of the given AVCodecContext to default values corresponding
3298 * to the given codec (defaults may be codec-dependent).
3300 * Do not call this function if a non-NULL codec has been passed
3301 * to avcodec_alloc_context3() that allocated this AVCodecContext.
3302 * If codec is non-NULL, it is illegal to call avcodec_open2() with a
3303 * different codec on this AVCodecContext.
3305 int avcodec_get_context_defaults3(AVCodecContext *s, AVCodec *codec);
3308 * Get the AVClass for AVCodecContext. It can be used in combination with
3309 * AV_OPT_SEARCH_FAKE_OBJ for examining options.
3311 * @see av_opt_find().
3313 const AVClass *avcodec_get_class(void);
3316 * Get the AVClass for AVFrame. It can be used in combination with
3317 * AV_OPT_SEARCH_FAKE_OBJ for examining options.
3319 * @see av_opt_find().
3321 const AVClass *avcodec_get_frame_class(void);
3324 * Get the AVClass for AVSubtitleRect. It can be used in combination with
3325 * AV_OPT_SEARCH_FAKE_OBJ for examining options.
3327 * @see av_opt_find().
3329 const AVClass *avcodec_get_subtitle_rect_class(void);
3332 * Copy the settings of the source AVCodecContext into the destination
3333 * AVCodecContext. The resulting destination codec context will be
3334 * unopened, i.e. you are required to call avcodec_open2() before you
3335 * can use this AVCodecContext to decode/encode video/audio data.
3337 * @param dest target codec context, should be initialized with
3338 * avcodec_alloc_context3(), but otherwise uninitialized
3339 * @param src source codec context
3340 * @return AVERROR() on error (e.g. memory allocation error), 0 on success
3342 int avcodec_copy_context(AVCodecContext *dest, const AVCodecContext *src);
3345 * Allocate an AVFrame and set its fields to default values. The resulting
3346 * struct can be deallocated by simply calling av_free().
3348 * @return An AVFrame filled with default values or NULL on failure.
3349 * @see avcodec_get_frame_defaults
3351 AVFrame *avcodec_alloc_frame(void);
3354 * Set the fields of the given AVFrame to default values.
3356 * @param pic The AVFrame of which the fields should be set to default values.
3358 void avcodec_get_frame_defaults(AVFrame *pic);
3360 #if FF_API_AVCODEC_OPEN
3362 * Initialize the AVCodecContext to use the given AVCodec. Prior to using this
3363 * function the context has to be allocated.
3365 * The functions avcodec_find_decoder_by_name(), avcodec_find_encoder_by_name(),
3366 * avcodec_find_decoder() and avcodec_find_encoder() provide an easy way for
3367 * retrieving a codec.
3369 * @warning This function is not thread safe!
3372 * avcodec_register_all();
3373 * codec = avcodec_find_decoder(CODEC_ID_H264);
3377 * context = avcodec_alloc_context3(codec);
3379 * if (avcodec_open(context, codec) < 0)
3383 * @param avctx The context which will be set up to use the given codec.
3384 * @param codec The codec to use within the context.
3385 * @return zero on success, a negative value on error
3386 * @see avcodec_alloc_context3, avcodec_find_decoder, avcodec_find_encoder, avcodec_close
3388 * @deprecated use avcodec_open2
3390 attribute_deprecated
3391 int avcodec_open(AVCodecContext *avctx, AVCodec *codec);
3395 * Initialize the AVCodecContext to use the given AVCodec. Prior to using this
3396 * function the context has to be allocated with avcodec_alloc_context3().
3398 * The functions avcodec_find_decoder_by_name(), avcodec_find_encoder_by_name(),
3399 * avcodec_find_decoder() and avcodec_find_encoder() provide an easy way for
3400 * retrieving a codec.
3402 * @warning This function is not thread safe!
3405 * avcodec_register_all();
3406 * av_dict_set(&opts, "b", "2.5M", 0);
3407 * codec = avcodec_find_decoder(CODEC_ID_H264);
3411 * context = avcodec_alloc_context3(codec);
3413 * if (avcodec_open2(context, codec, opts) < 0)
3417 * @param avctx The context to initialize.
3418 * @param codec The codec to open this context for. If a non-NULL codec has been
3419 * previously passed to avcodec_alloc_context3() or
3420 * avcodec_get_context_defaults3() for this context, then this
3421 * parameter MUST be either NULL or equal to the previously passed
3423 * @param options A dictionary filled with AVCodecContext and codec-private options.
3424 * On return this object will be filled with options that were not found.
3426 * @return zero on success, a negative value on error
3427 * @see avcodec_alloc_context3(), avcodec_find_decoder(), avcodec_find_encoder(),
3428 * av_dict_set(), av_opt_find().
3430 int avcodec_open2(AVCodecContext *avctx, AVCodec *codec, AVDictionary **options);
3433 * Close a given AVCodecContext and free all the data associated with it
3434 * (but not the AVCodecContext itself).
3436 * Calling this function on an AVCodecContext that hasn't been opened will free
3437 * the codec-specific data allocated in avcodec_alloc_context3() /
3438 * avcodec_get_context_defaults3() with a non-NULL codec. Subsequent calls will
3441 int avcodec_close(AVCodecContext *avctx);
3444 * Free all allocated data in the given subtitle struct.
3446 * @param sub AVSubtitle to free.
3448 void avsubtitle_free(AVSubtitle *sub);
3455 * @addtogroup lavc_packet
3460 * @deprecated use NULL instead
3462 attribute_deprecated void av_destruct_packet_nofree(AVPacket *pkt);
3465 * Default packet destructor.
3467 void av_destruct_packet(AVPacket *pkt);
3470 * Initialize optional fields of a packet with default values.
3474 void av_init_packet(AVPacket *pkt);
3477 * Allocate the payload of a packet and initialize its fields with
3481 * @param size wanted payload size
3482 * @return 0 if OK, AVERROR_xxx otherwise
3484 int av_new_packet(AVPacket *pkt, int size);
3487 * Reduce packet size, correctly zeroing padding
3490 * @param size new size
3492 void av_shrink_packet(AVPacket *pkt, int size);
3495 * Increase packet size, correctly zeroing padding
3498 * @param grow_by number of bytes by which to increase the size of the packet
3500 int av_grow_packet(AVPacket *pkt, int grow_by);
3503 * @warning This is a hack - the packet memory allocation stuff is broken. The
3504 * packet is allocated if it was not really allocated.
3506 int av_dup_packet(AVPacket *pkt);
3511 * @param pkt packet to free
3513 void av_free_packet(AVPacket *pkt);
3516 * Allocate new information of a packet.
3519 * @param type side information type
3520 * @param size side information size
3521 * @return pointer to fresh allocated data or NULL otherwise
3523 uint8_t* av_packet_new_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
3527 * Shrink the already allocated side data buffer
3530 * @param type side information type
3531 * @param size new side information size
3532 * @return 0 on success, < 0 on failure
3534 int av_packet_shrink_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
3538 * Get side information from packet.
3541 * @param type desired side information type
3542 * @param size pointer for side information size to store (optional)
3543 * @return pointer to data if present or NULL otherwise
3545 uint8_t* av_packet_get_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
3548 int av_packet_merge_side_data(AVPacket *pkt);
3550 int av_packet_split_side_data(AVPacket *pkt);
3558 * @addtogroup lavc_decoding
3563 * Find a registered decoder with a matching codec ID.
3565 * @param id CodecID of the requested decoder
3566 * @return A decoder if one was found, NULL otherwise.
3568 AVCodec *avcodec_find_decoder(enum CodecID id);
3571 * Find a registered decoder with the specified name.
3573 * @param name name of the requested decoder
3574 * @return A decoder if one was found, NULL otherwise.
3576 AVCodec *avcodec_find_decoder_by_name(const char *name);
3578 int avcodec_default_get_buffer(AVCodecContext *s, AVFrame *pic);
3579 void avcodec_default_release_buffer(AVCodecContext *s, AVFrame *pic);
3580 int avcodec_default_reget_buffer(AVCodecContext *s, AVFrame *pic);
3583 * Return the amount of padding in pixels which the get_buffer callback must
3584 * provide around the edge of the image for codecs which do not have the
3585 * CODEC_FLAG_EMU_EDGE flag.
3587 * @return Required padding in pixels.
3589 unsigned avcodec_get_edge_width(void);
3592 * Modify width and height values so that they will result in a memory
3593 * buffer that is acceptable for the codec if you do not use any horizontal
3596 * May only be used if a codec with CODEC_CAP_DR1 has been opened.
3597 * If CODEC_FLAG_EMU_EDGE is not set, the dimensions must have been increased
3598 * according to avcodec_get_edge_width() before.
3600 void avcodec_align_dimensions(AVCodecContext *s, int *width, int *height);
3603 * Modify width and height values so that they will result in a memory
3604 * buffer that is acceptable for the codec if you also ensure that all
3605 * line sizes are a multiple of the respective linesize_align[i].
3607 * May only be used if a codec with CODEC_CAP_DR1 has been opened.
3608 * If CODEC_FLAG_EMU_EDGE is not set, the dimensions must have been increased
3609 * according to avcodec_get_edge_width() before.
3611 void avcodec_align_dimensions2(AVCodecContext *s, int *width, int *height,
3612 int linesize_align[AV_NUM_DATA_POINTERS]);
3614 #if FF_API_OLD_DECODE_AUDIO
3616 * Wrapper function which calls avcodec_decode_audio4.
3618 * @deprecated Use avcodec_decode_audio4 instead.
3620 * Decode the audio frame of size avpkt->size from avpkt->data into samples.
3621 * Some decoders may support multiple frames in a single AVPacket, such
3622 * decoders would then just decode the first frame. In this case,
3623 * avcodec_decode_audio3 has to be called again with an AVPacket that contains
3624 * the remaining data in order to decode the second frame etc.
3626 * could be outputted, frame_size_ptr is zero. Otherwise, it is the
3627 * decompressed frame size in bytes.
3629 * @warning You must set frame_size_ptr to the allocated size of the
3630 * output buffer before calling avcodec_decode_audio3().
3632 * @warning The input buffer must be FF_INPUT_BUFFER_PADDING_SIZE larger than
3633 * the actual read bytes because some optimized bitstream readers read 32 or 64
3634 * bits at once and could read over the end.
3636 * @warning The end of the input buffer avpkt->data should be set to 0 to ensure that
3637 * no overreading happens for damaged MPEG streams.
3639 * @warning You must not provide a custom get_buffer() when using
3640 * avcodec_decode_audio3(). Doing so will override it with
3641 * avcodec_default_get_buffer. Use avcodec_decode_audio4() instead,
3642 * which does allow the application to provide a custom get_buffer().
3644 * @note You might have to align the input buffer avpkt->data and output buffer
3645 * samples. The alignment requirements depend on the CPU: On some CPUs it isn't
3646 * necessary at all, on others it won't work at all if not aligned and on others
3647 * it will work but it will have an impact on performance.
3649 * In practice, avpkt->data should have 4 byte alignment at minimum and
3650 * samples should be 16 byte aligned unless the CPU doesn't need it
3651 * (AltiVec and SSE do).
3653 * @note Codecs which have the CODEC_CAP_DELAY capability set have a delay
3654 * between input and output, these need to be fed with avpkt->data=NULL,
3655 * avpkt->size=0 at the end to return the remaining frames.
3657 * @param avctx the codec context
3658 * @param[out] samples the output buffer, sample type in avctx->sample_fmt
3659 * If the sample format is planar, each channel plane will
3660 * be the same size, with no padding between channels.
3661 * @param[in,out] frame_size_ptr the output buffer size in bytes
3662 * @param[in] avpkt The input AVPacket containing the input buffer.
3663 * You can create such packet with av_init_packet() and by then setting
3664 * data and size, some decoders might in addition need other fields.
3665 * All decoders are designed to use the least fields possible though.
3666 * @return On error a negative value is returned, otherwise the number of bytes
3667 * used or zero if no frame data was decompressed (used) from the input AVPacket.
3669 attribute_deprecated int avcodec_decode_audio3(AVCodecContext *avctx, int16_t *samples,
3670 int *frame_size_ptr,
3675 * Decode the audio frame of size avpkt->size from avpkt->data into frame.
3677 * Some decoders may support multiple frames in a single AVPacket. Such
3678 * decoders would then just decode the first frame. In this case,
3679 * avcodec_decode_audio4 has to be called again with an AVPacket containing
3680 * the remaining data in order to decode the second frame, etc...
3681 * Even if no frames are returned, the packet needs to be fed to the decoder
3682 * with remaining data until it is completely consumed or an error occurs.
3684 * @warning The input buffer, avpkt->data must be FF_INPUT_BUFFER_PADDING_SIZE
3685 * larger than the actual read bytes because some optimized bitstream
3686 * readers read 32 or 64 bits at once and could read over the end.
3688 * @note You might have to align the input buffer. The alignment requirements
3689 * depend on the CPU and the decoder.
3691 * @param avctx the codec context
3692 * @param[out] frame The AVFrame in which to store decoded audio samples.
3693 * Decoders request a buffer of a particular size by setting
3694 * AVFrame.nb_samples prior to calling get_buffer(). The
3695 * decoder may, however, only utilize part of the buffer by
3696 * setting AVFrame.nb_samples to a smaller value in the
3698 * @param[out] got_frame_ptr Zero if no frame could be decoded, otherwise it is
3700 * @param[in] avpkt The input AVPacket containing the input buffer.
3701 * At least avpkt->data and avpkt->size should be set. Some
3702 * decoders might also require additional fields to be set.
3703 * @return A negative error code is returned if an error occurred during
3704 * decoding, otherwise the number of bytes consumed from the input
3705 * AVPacket is returned.
3707 int avcodec_decode_audio4(AVCodecContext *avctx, AVFrame *frame,
3708 int *got_frame_ptr, const AVPacket *avpkt);
3711 * Decode the video frame of size avpkt->size from avpkt->data into picture.
3712 * Some decoders may support multiple frames in a single AVPacket, such
3713 * decoders would then just decode the first frame.
3715 * @warning The input buffer must be FF_INPUT_BUFFER_PADDING_SIZE larger than
3716 * the actual read bytes because some optimized bitstream readers read 32 or 64
3717 * bits at once and could read over the end.
3719 * @warning The end of the input buffer buf should be set to 0 to ensure that
3720 * no overreading happens for damaged MPEG streams.
3722 * @note You might have to align the input buffer avpkt->data.
3723 * The alignment requirements depend on the CPU: on some CPUs it isn't
3724 * necessary at all, on others it won't work at all if not aligned and on others
3725 * it will work but it will have an impact on performance.
3727 * In practice, avpkt->data should have 4 byte alignment at minimum.
3729 * @note Codecs which have the CODEC_CAP_DELAY capability set have a delay
3730 * between input and output, these need to be fed with avpkt->data=NULL,
3731 * avpkt->size=0 at the end to return the remaining frames.
3733 * @param avctx the codec context
3734 * @param[out] picture The AVFrame in which the decoded video frame will be stored.
3735 * Use avcodec_alloc_frame to get an AVFrame, the codec will
3736 * allocate memory for the actual bitmap.
3737 * with default get/release_buffer(), the decoder frees/reuses the bitmap as it sees fit.
3738 * with overridden get/release_buffer() (needs CODEC_CAP_DR1) the user decides into what buffer the decoder
3739 * decodes and the decoder tells the user once it does not need the data anymore,
3740 * the user app can at this point free/reuse/keep the memory as it sees fit.
3742 * @param[in] avpkt The input AVpacket containing the input buffer.
3743 * You can create such packet with av_init_packet() and by then setting
3744 * data and size, some decoders might in addition need other fields like
3745 * flags&AV_PKT_FLAG_KEY. All decoders are designed to use the least
3747 * @param[in,out] got_picture_ptr Zero if no frame could be decompressed, otherwise, it is nonzero.
3748 * @return On error a negative value is returned, otherwise the number of bytes
3749 * used or zero if no frame could be decompressed.
3751 int avcodec_decode_video2(AVCodecContext *avctx, AVFrame *picture,
3752 int *got_picture_ptr,
3753 const AVPacket *avpkt);
3756 * Decode a subtitle message.
3757 * Return a negative value on error, otherwise return the number of bytes used.
3758 * If no subtitle could be decompressed, got_sub_ptr is zero.
3759 * Otherwise, the subtitle is stored in *sub.
3760 * Note that CODEC_CAP_DR1 is not available for subtitle codecs. This is for
3761 * simplicity, because the performance difference is expect to be negligible
3762 * and reusing a get_buffer written for video codecs would probably perform badly
3763 * due to a potentially very different allocation pattern.
3765 * @param avctx the codec context
3766 * @param[out] sub The AVSubtitle in which the decoded subtitle will be stored, must be
3767 freed with avsubtitle_free if *got_sub_ptr is set.
3768 * @param[in,out] got_sub_ptr Zero if no subtitle could be decompressed, otherwise, it is nonzero.
3769 * @param[in] avpkt The input AVPacket containing the input buffer.
3771 int avcodec_decode_subtitle2(AVCodecContext *avctx, AVSubtitle *sub,
3776 * @defgroup lavc_parsing Frame parsing
3780 typedef struct AVCodecParserContext {
3782 struct AVCodecParser *parser;
3783 int64_t frame_offset; /* offset of the current frame */
3784 int64_t cur_offset; /* current offset
3785 (incremented by each av_parser_parse()) */
3786 int64_t next_frame_offset; /* offset of the next frame */
3788 int pict_type; /* XXX: Put it back in AVCodecContext. */
3790 * This field is used for proper frame duration computation in lavf.
3791 * It signals, how much longer the frame duration of the current frame
3792 * is compared to normal frame duration.
3794 * frame_duration = (1 + repeat_pict) * time_base
3796 * It is used by codecs like H.264 to display telecined material.
3798 int repeat_pict; /* XXX: Put it back in AVCodecContext. */
3799 int64_t pts; /* pts of the current frame */
3800 int64_t dts; /* dts of the current frame */
3805 int fetch_timestamp;
3807 #define AV_PARSER_PTS_NB 4
3808 int cur_frame_start_index;
3809 int64_t cur_frame_offset[AV_PARSER_PTS_NB];
3810 int64_t cur_frame_pts[AV_PARSER_PTS_NB];
3811 int64_t cur_frame_dts[AV_PARSER_PTS_NB];
3814 #define PARSER_FLAG_COMPLETE_FRAMES 0x0001
3815 #define PARSER_FLAG_ONCE 0x0002
3816 /// Set if the parser has a valid file offset
3817 #define PARSER_FLAG_FETCHED_OFFSET 0x0004
3818 #define PARSER_FLAG_USE_CODEC_TS 0x1000
3820 int64_t offset; ///< byte offset from starting packet start
3821 int64_t cur_frame_end[AV_PARSER_PTS_NB];
3824 * Set by parser to 1 for key frames and 0 for non-key frames.
3825 * It is initialized to -1, so if the parser doesn't set this flag,
3826 * old-style fallback using AV_PICTURE_TYPE_I picture type as key frames
3832 * Time difference in stream time base units from the pts of this
3833 * packet to the point at which the output from the decoder has converged
3834 * independent from the availability of previous frames. That is, the
3835 * frames are virtually identical no matter if decoding started from
3836 * the very first frame or from this keyframe.
3837 * Is AV_NOPTS_VALUE if unknown.
3838 * This field is not the display duration of the current frame.
3839 * This field has no meaning if the packet does not have AV_PKT_FLAG_KEY
3842 * The purpose of this field is to allow seeking in streams that have no
3843 * keyframes in the conventional sense. It corresponds to the
3844 * recovery point SEI in H.264 and match_time_delta in NUT. It is also
3845 * essential for some types of subtitle streams to ensure that all
3846 * subtitles are correctly displayed after seeking.
3848 int64_t convergence_duration;
3850 // Timestamp generation support:
3852 * Synchronization point for start of timestamp generation.
3854 * Set to >0 for sync point, 0 for no sync point and <0 for undefined
3857 * For example, this corresponds to presence of H.264 buffering period
3863 * Offset of the current timestamp against last timestamp sync point in
3864 * units of AVCodecContext.time_base.
3866 * Set to INT_MIN when dts_sync_point unused. Otherwise, it must
3867 * contain a valid timestamp offset.
3869 * Note that the timestamp of sync point has usually a nonzero
3870 * dts_ref_dts_delta, which refers to the previous sync point. Offset of
3871 * the next frame after timestamp sync point will be usually 1.
3873 * For example, this corresponds to H.264 cpb_removal_delay.
3875 int dts_ref_dts_delta;
3878 * Presentation delay of current frame in units of AVCodecContext.time_base.
3880 * Set to INT_MIN when dts_sync_point unused. Otherwise, it must
3881 * contain valid non-negative timestamp delta (presentation time of a frame
3882 * must not lie in the past).
3884 * This delay represents the difference between decoding and presentation
3885 * time of the frame.
3887 * For example, this corresponds to H.264 dpb_output_delay.
3892 * Position of the packet in file.
3894 * Analogous to cur_frame_pts/dts
3896 int64_t cur_frame_pos[AV_PARSER_PTS_NB];
3899 * Byte position of currently parsed frame in stream.
3904 * Previous frame byte position.
3909 * Duration of the current frame.
3910 * For audio, this is in units of 1 / AVCodecContext.sample_rate.
3911 * For all other types, this is in units of AVCodecContext.time_base.
3914 } AVCodecParserContext;
3916 typedef struct AVCodecParser {
3917 int codec_ids[5]; /* several codec IDs are permitted */
3919 int (*parser_init)(AVCodecParserContext *s);
3920 int (*parser_parse)(AVCodecParserContext *s,
3921 AVCodecContext *avctx,
3922 const uint8_t **poutbuf, int *poutbuf_size,
3923 const uint8_t *buf, int buf_size);
3924 void (*parser_close)(AVCodecParserContext *s);
3925 int (*split)(AVCodecContext *avctx, const uint8_t *buf, int buf_size);
3926 struct AVCodecParser *next;
3929 AVCodecParser *av_parser_next(AVCodecParser *c);
3931 void av_register_codec_parser(AVCodecParser *parser);
3932 AVCodecParserContext *av_parser_init(int codec_id);
3937 * @param s parser context.
3938 * @param avctx codec context.
3939 * @param poutbuf set to pointer to parsed buffer or NULL if not yet finished.
3940 * @param poutbuf_size set to size of parsed buffer or zero if not yet finished.
3941 * @param buf input buffer.
3942 * @param buf_size input length, to signal EOF, this should be 0 (so that the last frame can be output).
3943 * @param pts input presentation timestamp.
3944 * @param dts input decoding timestamp.
3945 * @param pos input byte position in stream.
3946 * @return the number of bytes of the input bitstream used.
3951 * len = av_parser_parse2(myparser, AVCodecContext, &data, &size,
3958 * decode_frame(data, size);
3962 int av_parser_parse2(AVCodecParserContext *s,
3963 AVCodecContext *avctx,
3964 uint8_t **poutbuf, int *poutbuf_size,
3965 const uint8_t *buf, int buf_size,
3966 int64_t pts, int64_t dts,
3969 int av_parser_change(AVCodecParserContext *s,
3970 AVCodecContext *avctx,
3971 uint8_t **poutbuf, int *poutbuf_size,
3972 const uint8_t *buf, int buf_size, int keyframe);
3973 void av_parser_close(AVCodecParserContext *s);
3981 * @addtogroup lavc_encoding
3986 * Find a registered encoder with a matching codec ID.
3988 * @param id CodecID of the requested encoder
3989 * @return An encoder if one was found, NULL otherwise.
3991 AVCodec *avcodec_find_encoder(enum CodecID id);
3994 * Find a registered encoder with the specified name.
3996 * @param name name of the requested encoder
3997 * @return An encoder if one was found, NULL otherwise.
3999 AVCodec *avcodec_find_encoder_by_name(const char *name);
4001 #if FF_API_OLD_ENCODE_AUDIO
4003 * Encode an audio frame from samples into buf.
4005 * @deprecated Use avcodec_encode_audio2 instead.
4007 * @note The output buffer should be at least FF_MIN_BUFFER_SIZE bytes large.
4008 * However, for codecs with avctx->frame_size equal to 0 (e.g. PCM) the user
4009 * will know how much space is needed because it depends on the value passed
4010 * in buf_size as described below. In that case a lower value can be used.
4012 * @param avctx the codec context
4013 * @param[out] buf the output buffer
4014 * @param[in] buf_size the output buffer size
4015 * @param[in] samples the input buffer containing the samples
4016 * The number of samples read from this buffer is frame_size*channels,
4017 * both of which are defined in avctx.
4018 * For codecs which have avctx->frame_size equal to 0 (e.g. PCM) the number of
4019 * samples read from samples is equal to:
4020 * buf_size * 8 / (avctx->channels * av_get_bits_per_sample(avctx->codec_id))
4021 * This also implies that av_get_bits_per_sample() must not return 0 for these
4023 * @return On error a negative value is returned, on success zero or the number
4024 * of bytes used to encode the data read from the input buffer.
4026 int attribute_deprecated avcodec_encode_audio(AVCodecContext *avctx,
4027 uint8_t *buf, int buf_size,
4028 const short *samples);
4032 * Encode a frame of audio.
4034 * Takes input samples from frame and writes the next output packet, if
4035 * available, to avpkt. The output packet does not necessarily contain data for
4036 * the most recent frame, as encoders can delay, split, and combine input frames
4037 * internally as needed.
4039 * @param avctx codec context
4040 * @param avpkt output AVPacket.
4041 * The user can supply an output buffer by setting
4042 * avpkt->data and avpkt->size prior to calling the
4043 * function, but if the size of the user-provided data is not
4044 * large enough, encoding will fail. All other AVPacket fields
4045 * will be reset by the encoder using av_init_packet(). If
4046 * avpkt->data is NULL, the encoder will allocate it.
4047 * The encoder will set avpkt->size to the size of the
4050 * If this function fails or produces no output, avpkt will be
4051 * freed using av_free_packet() (i.e. avpkt->destruct will be
4052 * called to free the user supplied buffer).
4053 * @param[in] frame AVFrame containing the raw audio data to be encoded.
4054 * May be NULL when flushing an encoder that has the
4055 * CODEC_CAP_DELAY capability set.
4056 * If CODEC_CAP_VARIABLE_FRAME_SIZE is set, then each frame
4057 * can have any number of samples.
4058 * If it is not set, frame->nb_samples must be equal to
4059 * avctx->frame_size for all frames except the last.
4060 * The final frame may be smaller than avctx->frame_size.
4061 * @param[out] got_packet_ptr This field is set to 1 by libavcodec if the
4062 * output packet is non-empty, and to 0 if it is
4063 * empty. If the function returns an error, the
4064 * packet can be assumed to be invalid, and the
4065 * value of got_packet_ptr is undefined and should
4067 * @return 0 on success, negative error code on failure
4069 int avcodec_encode_audio2(AVCodecContext *avctx, AVPacket *avpkt,
4070 const AVFrame *frame, int *got_packet_ptr);
4072 #if FF_API_OLD_ENCODE_VIDEO
4074 * @deprecated use avcodec_encode_video2() instead.
4076 * Encode a video frame from pict into buf.
4077 * The input picture should be
4078 * stored using a specific format, namely avctx.pix_fmt.
4080 * @param avctx the codec context
4081 * @param[out] buf the output buffer for the bitstream of encoded frame
4082 * @param[in] buf_size the size of the output buffer in bytes
4083 * @param[in] pict the input picture to encode
4084 * @return On error a negative value is returned, on success zero or the number
4085 * of bytes used from the output buffer.
4087 attribute_deprecated
4088 int avcodec_encode_video(AVCodecContext *avctx, uint8_t *buf, int buf_size,
4089 const AVFrame *pict);
4093 * Encode a frame of video.
4095 * Takes input raw video data from frame and writes the next output packet, if
4096 * available, to avpkt. The output packet does not necessarily contain data for
4097 * the most recent frame, as encoders can delay and reorder input frames
4098 * internally as needed.
4100 * @param avctx codec context
4101 * @param avpkt output AVPacket.
4102 * The user can supply an output buffer by setting
4103 * avpkt->data and avpkt->size prior to calling the
4104 * function, but if the size of the user-provided data is not
4105 * large enough, encoding will fail. All other AVPacket fields
4106 * will be reset by the encoder using av_init_packet(). If
4107 * avpkt->data is NULL, the encoder will allocate it.
4108 * The encoder will set avpkt->size to the size of the
4109 * output packet. The returned data (if any) belongs to the
4110 * caller, he is responsible for freeing it.
4112 * If this function fails or produces no output, avpkt will be
4113 * freed using av_free_packet() (i.e. avpkt->destruct will be
4114 * called to free the user supplied buffer).
4115 * @param[in] frame AVFrame containing the raw video data to be encoded.
4116 * May be NULL when flushing an encoder that has the
4117 * CODEC_CAP_DELAY capability set.
4118 * @param[out] got_packet_ptr This field is set to 1 by libavcodec if the
4119 * output packet is non-empty, and to 0 if it is
4120 * empty. If the function returns an error, the
4121 * packet can be assumed to be invalid, and the
4122 * value of got_packet_ptr is undefined and should
4124 * @return 0 on success, negative error code on failure
4126 int avcodec_encode_video2(AVCodecContext *avctx, AVPacket *avpkt,
4127 const AVFrame *frame, int *got_packet_ptr);
4129 int avcodec_encode_subtitle(AVCodecContext *avctx, uint8_t *buf, int buf_size,
4130 const AVSubtitle *sub);
4138 * @defgroup lavc_resample Audio resampling
4143 struct ReSampleContext;
4144 struct AVResampleContext;
4146 typedef struct ReSampleContext ReSampleContext;
4149 * Initialize audio resampling context.
4151 * @param output_channels number of output channels
4152 * @param input_channels number of input channels
4153 * @param output_rate output sample rate
4154 * @param input_rate input sample rate
4155 * @param sample_fmt_out requested output sample format
4156 * @param sample_fmt_in input sample format
4157 * @param filter_length length of each FIR filter in the filterbank relative to the cutoff frequency
4158 * @param log2_phase_count log2 of the number of entries in the polyphase filterbank
4159 * @param linear if 1 then the used FIR filter will be linearly interpolated
4160 between the 2 closest, if 0 the closest will be used
4161 * @param cutoff cutoff frequency, 1.0 corresponds to half the output sampling rate
4162 * @return allocated ReSampleContext, NULL if error occurred
4164 ReSampleContext *av_audio_resample_init(int output_channels, int input_channels,
4165 int output_rate, int input_rate,
4166 enum AVSampleFormat sample_fmt_out,
4167 enum AVSampleFormat sample_fmt_in,
4168 int filter_length, int log2_phase_count,
4169 int linear, double cutoff);
4171 int audio_resample(ReSampleContext *s, short *output, short *input, int nb_samples);
4174 * Free resample context.
4176 * @param s a non-NULL pointer to a resample context previously
4177 * created with av_audio_resample_init()
4179 void audio_resample_close(ReSampleContext *s);
4183 * Initialize an audio resampler.
4184 * Note, if either rate is not an integer then simply scale both rates up so they are.
4185 * @param filter_length length of each FIR filter in the filterbank relative to the cutoff freq
4186 * @param log2_phase_count log2 of the number of entries in the polyphase filterbank
4187 * @param linear If 1 then the used FIR filter will be linearly interpolated
4188 between the 2 closest, if 0 the closest will be used
4189 * @param cutoff cutoff frequency, 1.0 corresponds to half the output sampling rate
4191 struct AVResampleContext *av_resample_init(int out_rate, int in_rate, int filter_length, int log2_phase_count, int linear, double cutoff);
4194 * Resample an array of samples using a previously configured context.
4195 * @param src an array of unconsumed samples
4196 * @param consumed the number of samples of src which have been consumed are returned here
4197 * @param src_size the number of unconsumed samples available
4198 * @param dst_size the amount of space in samples available in dst
4199 * @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.
4200 * @return the number of samples written in dst or -1 if an error occurred
4202 int av_resample(struct AVResampleContext *c, short *dst, short *src, int *consumed, int src_size, int dst_size, int update_ctx);
4206 * Compensate samplerate/timestamp drift. The compensation is done by changing
4207 * the resampler parameters, so no audible clicks or similar distortions occur
4208 * @param compensation_distance distance in output samples over which the compensation should be performed
4209 * @param sample_delta number of output samples which should be output less
4211 * example: av_resample_compensate(c, 10, 500)
4212 * here instead of 510 samples only 500 samples would be output
4214 * note, due to rounding the actual compensation might be slightly different,
4215 * especially if the compensation_distance is large and the in_rate used during init is small
4217 void av_resample_compensate(struct AVResampleContext *c, int sample_delta, int compensation_distance);
4218 void av_resample_close(struct AVResampleContext *c);
4225 * @addtogroup lavc_picture
4230 * Allocate memory for a picture. Call avpicture_free() to free it.
4232 * @see avpicture_fill()
4234 * @param picture the picture to be filled in
4235 * @param pix_fmt the format of the picture
4236 * @param width the width of the picture
4237 * @param height the height of the picture
4238 * @return zero if successful, a negative value if not
4240 int avpicture_alloc(AVPicture *picture, enum PixelFormat pix_fmt, int width, int height);
4243 * Free a picture previously allocated by avpicture_alloc().
4244 * The data buffer used by the AVPicture is freed, but the AVPicture structure
4247 * @param picture the AVPicture to be freed
4249 void avpicture_free(AVPicture *picture);
4252 * Fill in the AVPicture fields.
4253 * The fields of the given AVPicture are filled in by using the 'ptr' address
4254 * which points to the image data buffer. Depending on the specified picture
4255 * format, one or multiple image data pointers and line sizes will be set.
4256 * If a planar format is specified, several pointers will be set pointing to
4257 * the different picture planes and the line sizes of the different planes
4258 * will be stored in the lines_sizes array.
4259 * Call with ptr == NULL to get the required size for the ptr buffer.
4261 * To allocate the buffer and fill in the AVPicture fields in one call,
4262 * use avpicture_alloc().
4264 * @param picture AVPicture whose fields are to be filled in
4265 * @param ptr Buffer which will contain or contains the actual image data
4266 * @param pix_fmt The format in which the picture data is stored.
4267 * @param width the width of the image in pixels
4268 * @param height the height of the image in pixels
4269 * @return size of the image data in bytes
4271 int avpicture_fill(AVPicture *picture, uint8_t *ptr,
4272 enum PixelFormat pix_fmt, int width, int height);
4275 * Copy pixel data from an AVPicture into a buffer.
4276 * The data is stored compactly, without any gaps for alignment or padding
4277 * which may be applied by avpicture_fill().
4279 * @see avpicture_get_size()
4281 * @param[in] src AVPicture containing image data
4282 * @param[in] pix_fmt The format in which the picture data is stored.
4283 * @param[in] width the width of the image in pixels.
4284 * @param[in] height the height of the image in pixels.
4285 * @param[out] dest A buffer into which picture data will be copied.
4286 * @param[in] dest_size The size of 'dest'.
4287 * @return The number of bytes written to dest, or a negative value (error code) on error.
4289 int avpicture_layout(const AVPicture* src, enum PixelFormat pix_fmt, int width, int height,
4290 unsigned char *dest, int dest_size);
4293 * Calculate the size in bytes that a picture of the given width and height
4294 * would occupy if stored in the given picture format.
4295 * Note that this returns the size of a compact representation as generated
4296 * by avpicture_layout(), which can be smaller than the size required for e.g.
4299 * @param pix_fmt the given picture format
4300 * @param width the width of the image
4301 * @param height the height of the image
4302 * @return Image data size in bytes or -1 on error (e.g. too large dimensions).
4304 int avpicture_get_size(enum PixelFormat pix_fmt, int width, int height);
4307 * deinterlace - if not supported return -1
4309 int avpicture_deinterlace(AVPicture *dst, const AVPicture *src,
4310 enum PixelFormat pix_fmt, int width, int height);
4312 * Copy image src to dst. Wraps av_picture_data_copy() above.
4314 void av_picture_copy(AVPicture *dst, const AVPicture *src,
4315 enum PixelFormat pix_fmt, int width, int height);
4318 * Crop image top and left side.
4320 int av_picture_crop(AVPicture *dst, const AVPicture *src,
4321 enum PixelFormat pix_fmt, int top_band, int left_band);
4326 int av_picture_pad(AVPicture *dst, const AVPicture *src, int height, int width, enum PixelFormat pix_fmt,
4327 int padtop, int padbottom, int padleft, int padright, int *color);
4334 * @defgroup lavc_misc Utility functions
4337 * Miscellaneous utility functions related to both encoding and decoding
4343 * @defgroup lavc_misc_pixfmt Pixel formats
4345 * Functions for working with pixel formats.
4349 void avcodec_get_chroma_sub_sample(enum PixelFormat pix_fmt, int *h_shift, int *v_shift);
4352 * Return a value representing the fourCC code associated to the
4353 * pixel format pix_fmt, or 0 if no associated fourCC code can be
4356 unsigned int avcodec_pix_fmt_to_codec_tag(enum PixelFormat pix_fmt);
4358 #define FF_LOSS_RESOLUTION 0x0001 /**< loss due to resolution change */
4359 #define FF_LOSS_DEPTH 0x0002 /**< loss due to color depth change */
4360 #define FF_LOSS_COLORSPACE 0x0004 /**< loss due to color space conversion */
4361 #define FF_LOSS_ALPHA 0x0008 /**< loss of alpha bits */
4362 #define FF_LOSS_COLORQUANT 0x0010 /**< loss due to color quantization */
4363 #define FF_LOSS_CHROMA 0x0020 /**< loss of chroma (e.g. RGB to gray conversion) */
4366 * Compute what kind of losses will occur when converting from one specific
4367 * pixel format to another.
4368 * When converting from one pixel format to another, information loss may occur.
4369 * For example, when converting from RGB24 to GRAY, the color information will
4370 * be lost. Similarly, other losses occur when converting from some formats to
4371 * other formats. These losses can involve loss of chroma, but also loss of
4372 * resolution, loss of color depth, loss due to the color space conversion, loss
4373 * of the alpha bits or loss due to color quantization.
4374 * avcodec_get_fix_fmt_loss() informs you about the various types of losses
4375 * which will occur when converting from one pixel format to another.
4377 * @param[in] dst_pix_fmt destination pixel format
4378 * @param[in] src_pix_fmt source pixel format
4379 * @param[in] has_alpha Whether the source pixel format alpha channel is used.
4380 * @return Combination of flags informing you what kind of losses will occur
4381 * (maximum loss for an invalid dst_pix_fmt).
4383 int avcodec_get_pix_fmt_loss(enum PixelFormat dst_pix_fmt, enum PixelFormat src_pix_fmt,
4387 * Find the best pixel format to convert to given a certain source pixel
4388 * format. When converting from one pixel format to another, information loss
4389 * may occur. For example, when converting from RGB24 to GRAY, the color
4390 * information will be lost. Similarly, other losses occur when converting from
4391 * some formats to other formats. avcodec_find_best_pix_fmt() searches which of
4392 * the given pixel formats should be used to suffer the least amount of loss.
4393 * The pixel formats from which it chooses one, are determined by the
4394 * pix_fmt_mask parameter.
4396 * Note, only the first 64 pixel formats will fit in pix_fmt_mask.
4399 * src_pix_fmt = PIX_FMT_YUV420P;
4400 * pix_fmt_mask = (1 << PIX_FMT_YUV422P) | (1 << PIX_FMT_RGB24);
4401 * dst_pix_fmt = avcodec_find_best_pix_fmt(pix_fmt_mask, src_pix_fmt, alpha, &loss);
4404 * @param[in] pix_fmt_mask bitmask determining which pixel format to choose from
4405 * @param[in] src_pix_fmt source pixel format
4406 * @param[in] has_alpha Whether the source pixel format alpha channel is used.
4407 * @param[out] loss_ptr Combination of flags informing you what kind of losses will occur.
4408 * @return The best pixel format to convert to or -1 if none was found.
4410 enum PixelFormat avcodec_find_best_pix_fmt(int64_t pix_fmt_mask, enum PixelFormat src_pix_fmt,
4411 int has_alpha, int *loss_ptr);
4414 * Find the best pixel format to convert to given a certain source pixel
4415 * format and a selection of two destination pixel formats. When converting from
4416 * one pixel format to another, information loss may occur. For example, when converting
4417 * from RGB24 to GRAY, the color information will be lost. Similarly, other losses occur when
4418 * converting from some formats to other formats. avcodec_find_best_pix_fmt2() selects which of
4419 * the given pixel formats should be used to suffer the least amount of loss.
4421 * If one of the destination formats is PIX_FMT_NONE the other pixel format (if valid) will be
4425 * src_pix_fmt = PIX_FMT_YUV420P;
4426 * dst_pix_fmt1= PIX_FMT_RGB24;
4427 * dst_pix_fmt2= PIX_FMT_GRAY8;
4428 * dst_pix_fmt3= PIX_FMT_RGB8;
4429 * loss= FF_LOSS_CHROMA; // don't care about chroma loss, so chroma loss will be ignored.
4430 * dst_pix_fmt = avcodec_find_best_pix_fmt2(dst_pix_fmt1, dst_pix_fmt2, src_pix_fmt, alpha, &loss);
4431 * dst_pix_fmt = avcodec_find_best_pix_fmt2(dst_pix_fmt, dst_pix_fmt3, src_pix_fmt, alpha, &loss);
4434 * @param[in] dst_pix_fmt1 One of the two destination pixel formats to choose from
4435 * @param[in] dst_pix_fmt2 The other of the two destination pixel formats to choose from
4436 * @param[in] src_pix_fmt Source pixel format
4437 * @param[in] has_alpha Whether the source pixel format alpha channel is used.
4438 * @param[in, out] loss_ptr Combination of loss flags. In: selects which of the losses to ignore, i.e.
4439 * NULL or value of zero means we care about all losses. Out: the loss
4440 * that occurs when converting from src to selected dst pixel format.
4441 * @return The best pixel format to convert to or -1 if none was found.
4443 enum PixelFormat avcodec_find_best_pix_fmt2(enum PixelFormat dst_pix_fmt1, enum PixelFormat dst_pix_fmt2,
4444 enum PixelFormat src_pix_fmt, int has_alpha, int *loss_ptr);
4446 enum PixelFormat avcodec_default_get_format(struct AVCodecContext *s, const enum PixelFormat * fmt);
4452 void avcodec_set_dimensions(AVCodecContext *s, int width, int height);
4455 * Put a string representing the codec tag codec_tag in buf.
4457 * @param buf_size size in bytes of buf
4458 * @return the length of the string that would have been generated if
4459 * enough space had been available, excluding the trailing null
4461 size_t av_get_codec_tag_string(char *buf, size_t buf_size, unsigned int codec_tag);
4463 void avcodec_string(char *buf, int buf_size, AVCodecContext *enc, int encode);
4466 * Return a name for the specified profile, if available.
4468 * @param codec the codec that is searched for the given profile
4469 * @param profile the profile value for which a name is requested
4470 * @return A name for the profile if found, NULL otherwise.
4472 const char *av_get_profile_name(const AVCodec *codec, int profile);
4474 int avcodec_default_execute(AVCodecContext *c, int (*func)(AVCodecContext *c2, void *arg2),void *arg, int *ret, int count, int size);
4475 int avcodec_default_execute2(AVCodecContext *c, int (*func)(AVCodecContext *c2, void *arg2, int, int),void *arg, int *ret, int count);
4476 //FIXME func typedef
4479 * Fill audio frame data and linesize.
4480 * AVFrame extended_data channel pointers are allocated if necessary for
4483 * @param frame the AVFrame
4484 * frame->nb_samples must be set prior to calling the
4485 * function. This function fills in frame->data,
4486 * frame->extended_data, frame->linesize[0].
4487 * @param nb_channels channel count
4488 * @param sample_fmt sample format
4489 * @param buf buffer to use for frame data
4490 * @param buf_size size of buffer
4491 * @param align plane size sample alignment (0 = default)
4492 * @return 0 on success, negative error code on failure
4494 int avcodec_fill_audio_frame(AVFrame *frame, int nb_channels,
4495 enum AVSampleFormat sample_fmt, const uint8_t *buf,
4496 int buf_size, int align);
4499 * Flush buffers, should be called when seeking or when switching to a different stream.
4501 void avcodec_flush_buffers(AVCodecContext *avctx);
4503 void avcodec_default_free_buffers(AVCodecContext *s);
4506 * Return codec bits per sample.
4508 * @param[in] codec_id the codec
4509 * @return Number of bits per sample or zero if unknown for the given codec.
4511 int av_get_bits_per_sample(enum CodecID codec_id);
4514 * Return the PCM codec associated with a sample format.
4515 * @param be endianness, 0 for little, 1 for big,
4516 * -1 (or anything else) for native
4517 * @return CODEC_ID_PCM_* or CODEC_ID_NONE
4519 enum CodecID av_get_pcm_codec(enum AVSampleFormat fmt, int be);
4522 * Return codec bits per sample.
4523 * Only return non-zero if the bits per sample is exactly correct, not an
4526 * @param[in] codec_id the codec
4527 * @return Number of bits per sample or zero if unknown for the given codec.
4529 int av_get_exact_bits_per_sample(enum CodecID codec_id);
4532 * Return audio frame duration.
4534 * @param avctx codec context
4535 * @param frame_bytes size of the frame, or 0 if unknown
4536 * @return frame duration, in samples, if known. 0 if not able to
4539 int av_get_audio_frame_duration(AVCodecContext *avctx, int frame_bytes);
4542 typedef struct AVBitStreamFilterContext {
4544 struct AVBitStreamFilter *filter;
4545 AVCodecParserContext *parser;
4546 struct AVBitStreamFilterContext *next;
4547 } AVBitStreamFilterContext;
4550 typedef struct AVBitStreamFilter {
4553 int (*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 (*close)(AVBitStreamFilterContext *bsfc);
4558 struct AVBitStreamFilter *next;
4559 } AVBitStreamFilter;
4561 void av_register_bitstream_filter(AVBitStreamFilter *bsf);
4562 AVBitStreamFilterContext *av_bitstream_filter_init(const char *name);
4563 int av_bitstream_filter_filter(AVBitStreamFilterContext *bsfc,
4564 AVCodecContext *avctx, const char *args,
4565 uint8_t **poutbuf, int *poutbuf_size,
4566 const uint8_t *buf, int buf_size, int keyframe);
4567 void av_bitstream_filter_close(AVBitStreamFilterContext *bsf);
4569 AVBitStreamFilter *av_bitstream_filter_next(AVBitStreamFilter *f);
4574 * Reallocate the given block if it is not large enough, otherwise do nothing.
4578 void *av_fast_realloc(void *ptr, unsigned int *size, size_t min_size);
4581 * Allocate a buffer, reusing the given one if large enough.
4583 * Contrary to av_fast_realloc the current buffer contents might not be
4584 * preserved and on error the old buffer is freed, thus no special
4585 * handling to avoid memleaks is necessary.
4587 * @param ptr pointer to pointer to already allocated buffer, overwritten with pointer to new buffer
4588 * @param size size of the buffer *ptr points to
4589 * @param min_size minimum size of *ptr buffer after returning, *ptr will be NULL and
4590 * *size 0 if an error occurred.
4592 void av_fast_malloc(void *ptr, unsigned int *size, size_t min_size);
4595 * Same behaviour av_fast_malloc but the buffer has additional
4596 * FF_INPUT_PADDING_SIZE at the end which will will always be 0.
4598 * In addition the whole buffer will initially and after resizes
4599 * be 0-initialized so that no uninitialized data will ever appear.
4601 void av_fast_padded_malloc(void *ptr, unsigned int *size, size_t min_size);
4604 * Encode extradata length to a buffer. Used by xiph codecs.
4606 * @param s buffer to write to; must be at least (v/255+1) bytes long
4607 * @param v size of extradata in bytes
4608 * @return number of bytes written to the buffer.
4610 unsigned int av_xiphlacing(unsigned char *s, unsigned int v);
4613 * Log a generic warning message about a missing feature. This function is
4614 * intended to be used internally by FFmpeg (libavcodec, libavformat, etc.)
4615 * only, and would normally not be used by applications.
4616 * @param[in] avc a pointer to an arbitrary struct of which the first field is
4617 * a pointer to an AVClass struct
4618 * @param[in] feature string containing the name of the missing feature
4619 * @param[in] want_sample indicates if samples are wanted which exhibit this feature.
4620 * If want_sample is non-zero, additional verbage will be added to the log
4621 * message which tells the user how to report samples to the development
4624 void av_log_missing_feature(void *avc, const char *feature, int want_sample);
4627 * Log a generic warning message asking for a sample. This function is
4628 * intended to be used internally by FFmpeg (libavcodec, libavformat, etc.)
4629 * only, and would normally not be used by applications.
4630 * @param[in] avc a pointer to an arbitrary struct of which the first field is
4631 * a pointer to an AVClass struct
4632 * @param[in] msg string containing an optional message, or NULL if no message
4634 void av_log_ask_for_sample(void *avc, const char *msg, ...) av_printf_format(2, 3);
4637 * Register the hardware accelerator hwaccel.
4639 void av_register_hwaccel(AVHWAccel *hwaccel);
4642 * If hwaccel is NULL, returns the first registered hardware accelerator,
4643 * if hwaccel is non-NULL, returns the next registered hardware accelerator
4644 * after hwaccel, or NULL if hwaccel is the last one.
4646 AVHWAccel *av_hwaccel_next(AVHWAccel *hwaccel);
4650 * Lock operation used by lockmgr
4653 AV_LOCK_CREATE, ///< Create a mutex
4654 AV_LOCK_OBTAIN, ///< Lock the mutex
4655 AV_LOCK_RELEASE, ///< Unlock the mutex
4656 AV_LOCK_DESTROY, ///< Free mutex resources
4660 * Register a user provided lock manager supporting the operations
4661 * specified by AVLockOp. mutex points to a (void *) where the
4662 * lockmgr should store/get a pointer to a user allocated mutex. It's
4663 * NULL upon AV_LOCK_CREATE and != NULL for all other ops.
4665 * @param cb User defined callback. Note: FFmpeg may invoke calls to this
4666 * callback during the call to av_lockmgr_register().
4667 * Thus, the application must be prepared to handle that.
4668 * If cb is set to NULL the lockmgr will be unregistered.
4669 * Also note that during unregistration the previously registered
4670 * lockmgr callback may also be invoked.
4672 int av_lockmgr_register(int (*cb)(void **mutex, enum AVLockOp op));
4675 * Get the type of the given codec.
4677 enum AVMediaType avcodec_get_type(enum CodecID codec_id);
4680 * Get the name of a codec.
4681 * @return a static string identifying the codec; never NULL
4683 const char *avcodec_get_name(enum CodecID id);
4686 * @return a positive value if s is open (i.e. avcodec_open2() was called on it
4687 * with no corresponding avcodec_close()), 0 otherwise.
4689 int avcodec_is_open(AVCodecContext *s);
4692 * @return a non-zero number if codec is an encoder, zero otherwise
4694 int av_codec_is_encoder(AVCodec *codec);
4697 * @return a non-zero number if codec is a decoder, zero otherwise
4699 int av_codec_is_decoder(AVCodec *codec);
4705 #endif /* AVCODEC_AVCODEC_H */