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
73 * Identify the syntax and semantics of the bitstream.
74 * The principle is roughly:
75 * Two decoders with the same ID can decode the same streams.
76 * Two encoders with the same ID can encode compatible streams.
77 * There may be slight deviations from the principle due to implementation
80 * If you add a codec ID to this list, add it so that
81 * 1. no value of a existing codec ID changes (that would break ABI),
82 * 2. Give it a value which when taken as ASCII is recognized uniquely by a human as this specific codec.
83 * This ensures that 2 forks can independently add CodecIDs without producing conflicts.
90 CODEC_ID_MPEG2VIDEO, ///< preferred ID for MPEG-1/2 video decoding
91 CODEC_ID_MPEG2VIDEO_XVMC,
128 CODEC_ID_INTERPLAY_VIDEO,
140 CODEC_ID_TRUEMOTION1,
167 CODEC_ID_TRUEMOTION2,
184 CODEC_ID_DSICINVIDEO,
185 CODEC_ID_TIERTEXSEQVIDEO,
193 CODEC_ID_BETHSOFTVID,
209 CODEC_ID_MOTIONPIXELS,
227 CODEC_ID_IFF_BYTERUN1,
252 CODEC_ID_Y41P = MKBETAG('Y','4','1','P'),
253 CODEC_ID_ESCAPE130 = MKBETAG('E','1','3','0'),
254 CODEC_ID_AVRP = MKBETAG('A','V','R','P'),
256 CODEC_ID_G2M = MKBETAG( 0 ,'G','2','M'),
257 CODEC_ID_AYUV = MKBETAG('A','Y','U','V'),
258 CODEC_ID_V308 = MKBETAG('V','3','0','8'),
259 CODEC_ID_V408 = MKBETAG('V','4','0','8'),
260 CODEC_ID_YUV4 = MKBETAG('Y','U','V','4'),
262 /* various PCM "codecs" */
263 CODEC_ID_FIRST_AUDIO = 0x10000, ///< A dummy id pointing at the start of audio codecs
264 CODEC_ID_PCM_S16LE = 0x10000,
280 CODEC_ID_PCM_S24DAUD,
282 CODEC_ID_PCM_S16LE_PLANAR,
291 CODEC_ID_PCM_S8_PLANAR,
293 /* various ADPCM codecs */
294 CODEC_ID_ADPCM_IMA_QT = 0x11000,
295 CODEC_ID_ADPCM_IMA_WAV,
296 CODEC_ID_ADPCM_IMA_DK3,
297 CODEC_ID_ADPCM_IMA_DK4,
298 CODEC_ID_ADPCM_IMA_WS,
299 CODEC_ID_ADPCM_IMA_SMJPEG,
308 CODEC_ID_ADPCM_YAMAHA,
309 CODEC_ID_ADPCM_SBPRO_4,
310 CODEC_ID_ADPCM_SBPRO_3,
311 CODEC_ID_ADPCM_SBPRO_2,
313 CODEC_ID_ADPCM_IMA_AMV,
314 CODEC_ID_ADPCM_EA_R1,
315 CODEC_ID_ADPCM_EA_R3,
316 CODEC_ID_ADPCM_EA_R2,
317 CODEC_ID_ADPCM_IMA_EA_SEAD,
318 CODEC_ID_ADPCM_IMA_EA_EACS,
319 CODEC_ID_ADPCM_EA_XAS,
320 CODEC_ID_ADPCM_EA_MAXIS_XA,
321 CODEC_ID_ADPCM_IMA_ISS,
323 CODEC_ID_ADPCM_IMA_APC,
326 CODEC_ID_AMR_NB = 0x12000,
329 /* RealAudio codecs*/
330 CODEC_ID_RA_144 = 0x13000,
333 /* various DPCM codecs */
334 CODEC_ID_ROQ_DPCM = 0x14000,
335 CODEC_ID_INTERPLAY_DPCM,
340 CODEC_ID_MP2 = 0x15000,
341 CODEC_ID_MP3, ///< preferred ID for decoding MPEG audio layer 1, 2 or 3
357 CODEC_ID_WESTWOOD_SND1,
358 CODEC_ID_GSM, ///< as in Berlin toast format
366 CODEC_ID_DSICINAUDIO,
370 CODEC_ID_GSM_MS, /* as found in WAV */
379 CODEC_ID_WMALOSSLESS,
388 CODEC_ID_BINKAUDIO_RDFT,
389 CODEC_ID_BINKAUDIO_DCT,
398 CODEC_ID_FFWAVESYNTH = MKBETAG('F','F','W','S'),
399 CODEC_ID_8SVX_RAW = MKBETAG('8','S','V','X'),
400 CODEC_ID_SONIC = MKBETAG('S','O','N','C'),
401 CODEC_ID_SONIC_LS = MKBETAG('S','O','N','L'),
403 /* subtitle codecs */
404 CODEC_ID_FIRST_SUBTITLE = 0x17000, ///< A dummy ID pointing at the start of subtitle codecs.
405 CODEC_ID_DVD_SUBTITLE = 0x17000,
406 CODEC_ID_DVB_SUBTITLE,
407 CODEC_ID_TEXT, ///< raw UTF-8 text
411 CODEC_ID_HDMV_PGS_SUBTITLE,
412 CODEC_ID_DVB_TELETEXT,
414 CODEC_ID_MICRODVD = MKBETAG('m','D','V','D'),
416 /* other specific kind of codecs (generally used for attachments) */
417 CODEC_ID_FIRST_UNKNOWN = 0x18000, ///< A dummy ID pointing at the start of various fake codecs.
418 CODEC_ID_TTF = 0x18000,
419 CODEC_ID_BINTEXT = MKBETAG('B','T','X','T'),
420 CODEC_ID_XBIN = MKBETAG('X','B','I','N'),
421 CODEC_ID_IDF = MKBETAG( 0 ,'I','D','F'),
423 CODEC_ID_PROBE = 0x19000, ///< codec_id is not known (like CODEC_ID_NONE) but lavf should attempt to identify it
425 CODEC_ID_MPEG2TS = 0x20000, /**< _FAKE_ codec to indicate a raw MPEG-2 TS
426 * stream (only used by libavformat) */
427 CODEC_ID_MPEG4SYSTEMS = 0x20001, /**< _FAKE_ codec to indicate a MPEG-4 Systems
428 * stream (only used by libavformat) */
429 CODEC_ID_FFMETADATA = 0x21000, ///< Dummy codec for streams containing only metadata information.
432 #if FF_API_OLD_DECODE_AUDIO
434 #define AVCODEC_MAX_AUDIO_FRAME_SIZE 192000 // 1 second of 48khz 32bit audio
438 * Required number of additionally allocated bytes at the end of the input bitstream for decoding.
439 * This is mainly needed because some optimized bitstream readers read
440 * 32 or 64 bit at once and could read over the end.<br>
441 * Note: If the first 23 bits of the additional bytes are not 0, then damaged
442 * MPEG bitstreams could cause overread and segfault.
444 #define FF_INPUT_BUFFER_PADDING_SIZE 16
447 * minimum encoding buffer size
448 * Used to avoid some checks during header writing.
450 #define FF_MIN_BUFFER_SIZE 16384
454 * motion estimation type.
457 ME_ZERO = 1, ///< no search, that is use 0,0 vector whenever one is needed
461 ME_EPZS, ///< enhanced predictive zonal search
462 ME_X1, ///< reserved for experiments
463 ME_HEX, ///< hexagon based search
464 ME_UMH, ///< uneven multi-hexagon search
465 ME_ITER, ///< iterative search
466 ME_TESA, ///< transformed exhaustive search algorithm
470 /* We leave some space between them for extensions (drop some
471 * keyframes for intra-only or drop just some bidir frames). */
472 AVDISCARD_NONE =-16, ///< discard nothing
473 AVDISCARD_DEFAULT= 0, ///< discard useless packets like 0 size packets in avi
474 AVDISCARD_NONREF = 8, ///< discard all non reference
475 AVDISCARD_BIDIR = 16, ///< discard all bidirectional frames
476 AVDISCARD_NONKEY = 32, ///< discard all frames except keyframes
477 AVDISCARD_ALL = 48, ///< discard all
480 enum AVColorPrimaries{
481 AVCOL_PRI_BT709 =1, ///< also ITU-R BT1361 / IEC 61966-2-4 / SMPTE RP177 Annex B
482 AVCOL_PRI_UNSPECIFIED=2,
484 AVCOL_PRI_BT470BG =5, ///< also ITU-R BT601-6 625 / ITU-R BT1358 625 / ITU-R BT1700 625 PAL & SECAM
485 AVCOL_PRI_SMPTE170M =6, ///< also ITU-R BT601-6 525 / ITU-R BT1358 525 / ITU-R BT1700 NTSC
486 AVCOL_PRI_SMPTE240M =7, ///< functionally identical to above
488 AVCOL_PRI_NB , ///< Not part of ABI
491 enum AVColorTransferCharacteristic{
492 AVCOL_TRC_BT709 =1, ///< also ITU-R BT1361
493 AVCOL_TRC_UNSPECIFIED=2,
494 AVCOL_TRC_GAMMA22 =4, ///< also ITU-R BT470M / ITU-R BT1700 625 PAL & SECAM
495 AVCOL_TRC_GAMMA28 =5, ///< also ITU-R BT470BG
496 AVCOL_TRC_SMPTE240M =7,
497 AVCOL_TRC_NB , ///< Not part of ABI
502 AVCOL_SPC_BT709 =1, ///< also ITU-R BT1361 / IEC 61966-2-4 xvYCC709 / SMPTE RP177 Annex B
503 AVCOL_SPC_UNSPECIFIED=2,
505 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
506 AVCOL_SPC_SMPTE170M =6, ///< also ITU-R BT601-6 525 / ITU-R BT1358 525 / ITU-R BT1700 NTSC / functionally identical to above
507 AVCOL_SPC_SMPTE240M =7,
509 AVCOL_SPC_NB , ///< Not part of ABI
513 AVCOL_RANGE_UNSPECIFIED=0,
514 AVCOL_RANGE_MPEG =1, ///< the normal 219*2^(n-8) "MPEG" YUV ranges
515 AVCOL_RANGE_JPEG =2, ///< the normal 2^n-1 "JPEG" YUV ranges
516 AVCOL_RANGE_NB , ///< Not part of ABI
520 * X X 3 4 X X are luma samples,
521 * 1 2 1-6 are possible chroma positions
522 * X X 5 6 X 0 is undefined/unknown position
524 enum AVChromaLocation{
525 AVCHROMA_LOC_UNSPECIFIED=0,
526 AVCHROMA_LOC_LEFT =1, ///< mpeg2/4, h264 default
527 AVCHROMA_LOC_CENTER =2, ///< mpeg1, jpeg, h263
528 AVCHROMA_LOC_TOPLEFT =3, ///< DV
530 AVCHROMA_LOC_BOTTOMLEFT =5,
531 AVCHROMA_LOC_BOTTOM =6,
532 AVCHROMA_LOC_NB , ///< Not part of ABI
535 enum AVAudioServiceType {
536 AV_AUDIO_SERVICE_TYPE_MAIN = 0,
537 AV_AUDIO_SERVICE_TYPE_EFFECTS = 1,
538 AV_AUDIO_SERVICE_TYPE_VISUALLY_IMPAIRED = 2,
539 AV_AUDIO_SERVICE_TYPE_HEARING_IMPAIRED = 3,
540 AV_AUDIO_SERVICE_TYPE_DIALOGUE = 4,
541 AV_AUDIO_SERVICE_TYPE_COMMENTARY = 5,
542 AV_AUDIO_SERVICE_TYPE_EMERGENCY = 6,
543 AV_AUDIO_SERVICE_TYPE_VOICE_OVER = 7,
544 AV_AUDIO_SERVICE_TYPE_KARAOKE = 8,
545 AV_AUDIO_SERVICE_TYPE_NB , ///< Not part of ABI
548 typedef struct RcOverride{
551 int qscale; // If this is 0 then quality_factor will be used instead.
552 float quality_factor;
555 #define FF_MAX_B_FRAMES 16
558 These flags can be passed in AVCodecContext.flags before initialization.
559 Note: Not everything is supported yet.
562 #define CODEC_FLAG_QSCALE 0x0002 ///< Use fixed qscale.
563 #define CODEC_FLAG_4MV 0x0004 ///< 4 MV per MB allowed / advanced prediction for H.263.
564 #define CODEC_FLAG_QPEL 0x0010 ///< Use qpel MC.
565 #define CODEC_FLAG_GMC 0x0020 ///< Use GMC.
566 #define CODEC_FLAG_MV0 0x0040 ///< Always try a MB with MV=<0,0>.
568 * The parent program guarantees that the input for B-frames containing
569 * streams is not written to for at least s->max_b_frames+1 frames, if
570 * this is not set the input will be copied.
572 #define CODEC_FLAG_INPUT_PRESERVED 0x0100
573 #define CODEC_FLAG_PASS1 0x0200 ///< Use internal 2pass ratecontrol in first pass mode.
574 #define CODEC_FLAG_PASS2 0x0400 ///< Use internal 2pass ratecontrol in second pass mode.
575 #define CODEC_FLAG_GRAY 0x2000 ///< Only decode/encode grayscale.
576 #define CODEC_FLAG_EMU_EDGE 0x4000 ///< Don't draw edges.
577 #define CODEC_FLAG_PSNR 0x8000 ///< error[?] variables will be set during encoding.
578 #define CODEC_FLAG_TRUNCATED 0x00010000 /** Input bitstream might be truncated at a random
579 location instead of only at frame boundaries. */
580 #define CODEC_FLAG_NORMALIZE_AQP 0x00020000 ///< Normalize adaptive quantization.
581 #define CODEC_FLAG_INTERLACED_DCT 0x00040000 ///< Use interlaced DCT.
582 #define CODEC_FLAG_LOW_DELAY 0x00080000 ///< Force low delay.
583 #define CODEC_FLAG_GLOBAL_HEADER 0x00400000 ///< Place global headers in extradata instead of every keyframe.
584 #define CODEC_FLAG_BITEXACT 0x00800000 ///< Use only bitexact stuff (except (I)DCT).
585 /* Fx : Flag for h263+ extra options */
586 #define CODEC_FLAG_AC_PRED 0x01000000 ///< H.263 advanced intra coding / MPEG-4 AC prediction
587 #define CODEC_FLAG_LOOP_FILTER 0x00000800 ///< loop filter
588 #define CODEC_FLAG_INTERLACED_ME 0x20000000 ///< interlaced motion estimation
589 #define CODEC_FLAG_CLOSED_GOP 0x80000000
590 #define CODEC_FLAG2_FAST 0x00000001 ///< Allow non spec compliant speedup tricks.
591 #define CODEC_FLAG2_NO_OUTPUT 0x00000004 ///< Skip bitstream encoding.
592 #define CODEC_FLAG2_LOCAL_HEADER 0x00000008 ///< Place global headers at every keyframe instead of in extradata.
593 #define CODEC_FLAG2_DROP_FRAME_TIMECODE 0x00002000 ///< timecode is in drop frame format. DEPRECATED!!!!
594 #if FF_API_MPV_GLOBAL_OPTS
595 #define CODEC_FLAG_CBP_RD 0x04000000 ///< Use rate distortion optimization for cbp.
596 #define CODEC_FLAG_QP_RD 0x08000000 ///< Use rate distortion optimization for qp selectioon.
597 #define CODEC_FLAG2_STRICT_GOP 0x00000002 ///< Strictly enforce GOP size.
598 #define CODEC_FLAG2_SKIP_RD 0x00004000 ///< RD optimal MB level residual skipping
600 #define CODEC_FLAG2_CHUNKS 0x00008000 ///< Input bitstream might be truncated at a packet boundaries instead of only at frame boundaries.
601 #define CODEC_FLAG2_SHOW_ALL 0x00400000 ///< Show all frames before the first keyframe
603 /* Unsupported options :
604 * Syntax Arithmetic coding (SAC)
605 * Reference Picture Selection
606 * Independent Segment Decoding */
608 /* codec capabilities */
610 #define CODEC_CAP_DRAW_HORIZ_BAND 0x0001 ///< Decoder can use draw_horiz_band callback.
612 * Codec uses get_buffer() for allocating buffers and supports custom allocators.
613 * If not set, it might not use get_buffer() at all or use operations that
614 * assume the buffer was allocated by avcodec_default_get_buffer.
616 #define CODEC_CAP_DR1 0x0002
617 #define CODEC_CAP_TRUNCATED 0x0008
618 /* Codec can export data for HW decoding (XvMC). */
619 #define CODEC_CAP_HWACCEL 0x0010
621 * Encoder or decoder requires flushing with NULL input at the end in order to
622 * give the complete and correct output.
624 * NOTE: If this flag is not set, the codec is guaranteed to never be fed with
625 * with NULL data. The user can still send NULL data to the public encode
626 * or decode function, but libavcodec will not pass it along to the codec
627 * unless this flag is set.
630 * The decoder has a non-zero delay and needs to be fed with avpkt->data=NULL,
631 * avpkt->size=0 at the end to get the delayed data until the decoder no longer
635 * The encoder needs to be fed with NULL data at the end of encoding until the
636 * encoder no longer returns data.
638 * NOTE: For encoders implementing the AVCodec.encode2() function, setting this
639 * flag also means that the encoder must set the pts and duration for
640 * each output packet. If this flag is not set, the pts and duration will
641 * be determined by libavcodec from the input frame.
643 #define CODEC_CAP_DELAY 0x0020
645 * Codec can be fed a final frame with a smaller size.
646 * This can be used to prevent truncation of the last audio samples.
648 #define CODEC_CAP_SMALL_LAST_FRAME 0x0040
650 * Codec can export data for HW decoding (VDPAU).
652 #define CODEC_CAP_HWACCEL_VDPAU 0x0080
654 * Codec can output multiple frames per AVPacket
655 * Normally demuxers return one frame at a time, demuxers which do not do
656 * are connected to a parser to split what they return into proper frames.
657 * This flag is reserved to the very rare category of codecs which have a
658 * bitstream that cannot be split into frames without timeconsuming
659 * operations like full decoding. Demuxers carring such bitstreams thus
660 * may return multiple frames in a packet. This has many disadvantages like
661 * prohibiting stream copy in many cases thus it should only be considered
664 #define CODEC_CAP_SUBFRAMES 0x0100
666 * Codec is experimental and is thus avoided in favor of non experimental
669 #define CODEC_CAP_EXPERIMENTAL 0x0200
671 * Codec should fill in channel configuration and samplerate instead of container
673 #define CODEC_CAP_CHANNEL_CONF 0x0400
676 * Codec is able to deal with negative linesizes
678 #define CODEC_CAP_NEG_LINESIZES 0x0800
681 * Codec supports frame-level multithreading.
683 #define CODEC_CAP_FRAME_THREADS 0x1000
685 * Codec supports slice-based (or partition-based) multithreading.
687 #define CODEC_CAP_SLICE_THREADS 0x2000
689 * Codec supports changed parameters at any point.
691 #define CODEC_CAP_PARAM_CHANGE 0x4000
693 * Codec supports avctx->thread_count == 0 (auto).
695 #define CODEC_CAP_AUTO_THREADS 0x8000
697 * Audio encoder supports receiving a different number of samples in each call.
699 #define CODEC_CAP_VARIABLE_FRAME_SIZE 0x10000
703 #define CODEC_CAP_LOSSLESS 0x80000000
705 //The following defines may change, don't expect compatibility if you use them.
706 #define MB_TYPE_INTRA4x4 0x0001
707 #define MB_TYPE_INTRA16x16 0x0002 //FIXME H.264-specific
708 #define MB_TYPE_INTRA_PCM 0x0004 //FIXME H.264-specific
709 #define MB_TYPE_16x16 0x0008
710 #define MB_TYPE_16x8 0x0010
711 #define MB_TYPE_8x16 0x0020
712 #define MB_TYPE_8x8 0x0040
713 #define MB_TYPE_INTERLACED 0x0080
714 #define MB_TYPE_DIRECT2 0x0100 //FIXME
715 #define MB_TYPE_ACPRED 0x0200
716 #define MB_TYPE_GMC 0x0400
717 #define MB_TYPE_SKIP 0x0800
718 #define MB_TYPE_P0L0 0x1000
719 #define MB_TYPE_P1L0 0x2000
720 #define MB_TYPE_P0L1 0x4000
721 #define MB_TYPE_P1L1 0x8000
722 #define MB_TYPE_L0 (MB_TYPE_P0L0 | MB_TYPE_P1L0)
723 #define MB_TYPE_L1 (MB_TYPE_P0L1 | MB_TYPE_P1L1)
724 #define MB_TYPE_L0L1 (MB_TYPE_L0 | MB_TYPE_L1)
725 #define MB_TYPE_QUANT 0x00010000
726 #define MB_TYPE_CBP 0x00020000
727 //Note bits 24-31 are reserved for codec specific use (h264 ref0, mpeg1 0mv, ...)
731 * This specifies the area which should be displayed.
732 * Note there may be multiple such areas for one frame.
734 typedef struct AVPanScan{
737 * - encoding: Set by user.
738 * - decoding: Set by libavcodec.
743 * width and height in 1/16 pel
744 * - encoding: Set by user.
745 * - decoding: Set by libavcodec.
751 * position of the top left corner in 1/16 pel for up to 3 fields/frames
752 * - encoding: Set by user.
753 * - decoding: Set by libavcodec.
755 int16_t position[3][2];
758 #define FF_QSCALE_TYPE_MPEG1 0
759 #define FF_QSCALE_TYPE_MPEG2 1
760 #define FF_QSCALE_TYPE_H264 2
761 #define FF_QSCALE_TYPE_VP56 3
763 #define FF_BUFFER_TYPE_INTERNAL 1
764 #define FF_BUFFER_TYPE_USER 2 ///< direct rendering buffers (image is (de)allocated by user)
765 #define FF_BUFFER_TYPE_SHARED 4 ///< Buffer from somewhere else; don't deallocate image (data/base), all other tables are not shared.
766 #define FF_BUFFER_TYPE_COPY 8 ///< Just a (modified) copy of some other buffer, don't deallocate anything.
768 #define FF_BUFFER_HINTS_VALID 0x01 // Buffer hints value is meaningful (if 0 ignore).
769 #define FF_BUFFER_HINTS_READABLE 0x02 // Codec will read from buffer.
770 #define FF_BUFFER_HINTS_PRESERVE 0x04 // User must not alter buffer content.
771 #define FF_BUFFER_HINTS_REUSABLE 0x08 // Codec will reuse the buffer (update).
773 enum AVPacketSideDataType {
775 AV_PKT_DATA_NEW_EXTRADATA,
776 AV_PKT_DATA_PARAM_CHANGE,
777 AV_PKT_DATA_H263_MB_INFO,
780 typedef struct AVPacket {
782 * Presentation timestamp in AVStream->time_base units; the time at which
783 * the decompressed packet will be presented to the user.
784 * Can be AV_NOPTS_VALUE if it is not stored in the file.
785 * pts MUST be larger or equal to dts as presentation cannot happen before
786 * decompression, unless one wants to view hex dumps. Some formats misuse
787 * the terms dts and pts/cts to mean something different. Such timestamps
788 * must be converted to true pts/dts before they are stored in AVPacket.
792 * Decompression timestamp in AVStream->time_base units; the time at which
793 * the packet is decompressed.
794 * Can be AV_NOPTS_VALUE if it is not stored in the file.
801 * A combination of AV_PKT_FLAG values
805 * Additional packet data that can be provided by the container.
806 * Packet can contain several types of side information.
811 enum AVPacketSideDataType type;
816 * Duration of this packet in AVStream->time_base units, 0 if unknown.
817 * Equals next_pts - this_pts in presentation order.
820 void (*destruct)(struct AVPacket *);
822 int64_t pos; ///< byte position in stream, -1 if unknown
825 * Time difference in AVStream->time_base units from the pts of this
826 * packet to the point at which the output from the decoder has converged
827 * independent from the availability of previous frames. That is, the
828 * frames are virtually identical no matter if decoding started from
829 * the very first frame or from this keyframe.
830 * Is AV_NOPTS_VALUE if unknown.
831 * This field is not the display duration of the current packet.
832 * This field has no meaning if the packet does not have AV_PKT_FLAG_KEY
835 * The purpose of this field is to allow seeking in streams that have no
836 * keyframes in the conventional sense. It corresponds to the
837 * recovery point SEI in H.264 and match_time_delta in NUT. It is also
838 * essential for some types of subtitle streams to ensure that all
839 * subtitles are correctly displayed after seeking.
841 int64_t convergence_duration;
843 #define AV_PKT_FLAG_KEY 0x0001 ///< The packet contains a keyframe
844 #define AV_PKT_FLAG_CORRUPT 0x0002 ///< The packet content is corrupted
847 * An AV_PKT_DATA_PARAM_CHANGE side data packet is laid out as follows:
849 * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_COUNT)
850 * s32le channel_count
851 * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_LAYOUT)
852 * u64le channel_layout
853 * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_SAMPLE_RATE)
855 * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_DIMENSIONS)
861 * An AV_PKT_DATA_H263_MB_INFO side data packet contains a number of
862 * structures with info about macroblocks relevant to splitting the
863 * packet into smaller packets on macroblock edges (e.g. as for RFC 2190).
864 * That is, it does not necessarily contain info about all macroblocks,
865 * as long as the distance between macroblocks in the info is smaller
866 * than the target payload size.
867 * Each MB info structure is 12 bytes, and is laid out as follows:
868 * u32le bit offset from the start of the packet
869 * u8 current quantizer at the start of the macroblock
871 * u16le macroblock address within the GOB
872 * u8 horizontal MV predictor
873 * u8 vertical MV predictor
874 * u8 horizontal MV predictor for block number 3
875 * u8 vertical MV predictor for block number 3
878 enum AVSideDataParamChangeFlags {
879 AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_COUNT = 0x0001,
880 AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_LAYOUT = 0x0002,
881 AV_SIDE_DATA_PARAM_CHANGE_SAMPLE_RATE = 0x0004,
882 AV_SIDE_DATA_PARAM_CHANGE_DIMENSIONS = 0x0008,
887 * New fields can be added to the end of AVFRAME with minor version
888 * bumps. Similarly fields that are marked as to be only accessed by
889 * av_opt_ptr() can be reordered. This allows 2 forks to add fields
890 * without breaking compatibility with each other.
891 * Removal, reordering and changes in the remaining cases require
892 * a major version bump.
893 * sizeof(AVFrame) must not be used outside libavcodec.
895 typedef struct AVFrame {
896 #define AV_NUM_DATA_POINTERS 8
898 * pointer to the picture/channel planes.
899 * This might be different from the first allocated byte
900 * - encoding: Set by user
901 * - decoding: set by AVCodecContext.get_buffer()
903 uint8_t *data[AV_NUM_DATA_POINTERS];
906 * Size, in bytes, of the data for each picture/channel plane.
908 * For audio, only linesize[0] may be set. For planar audio, each channel
909 * plane must be the same size.
911 * - encoding: Set by user
912 * - decoding: set by AVCodecContext.get_buffer()
914 int linesize[AV_NUM_DATA_POINTERS];
917 * pointers to the data planes/channels.
919 * For video, this should simply point to data[].
921 * For planar audio, each channel has a separate data pointer, and
922 * linesize[0] contains the size of each channel buffer.
923 * For packed audio, there is just one data pointer, and linesize[0]
924 * contains the total size of the buffer for all channels.
926 * Note: Both data and extended_data will always be set by get_buffer(),
927 * but for planar audio with more channels that can fit in data,
928 * extended_data must be used by the decoder in order to access all
932 * decoding: set by AVCodecContext.get_buffer()
934 uint8_t **extended_data;
937 * width and height of the video frame
939 * - decoding: Read by user.
944 * number of audio samples (per channel) described by this frame
945 * - encoding: Set by user
946 * - decoding: Set by libavcodec
951 * format of the frame, -1 if unknown or unset
952 * Values correspond to enum PixelFormat for video frames,
953 * enum AVSampleFormat for audio)
955 * - decoding: Read by user.
960 * 1 -> keyframe, 0-> not
961 * - encoding: Set by libavcodec.
962 * - decoding: Set by libavcodec.
967 * Picture type of the frame, see ?_TYPE below.
968 * - encoding: Set by libavcodec. for coded_picture (and set by user for input).
969 * - decoding: Set by libavcodec.
971 enum AVPictureType pict_type;
974 * pointer to the first allocated byte of the picture. Can be used in get_buffer/release_buffer.
975 * This isn't used by libavcodec unless the default get/release_buffer() is used.
979 uint8_t *base[AV_NUM_DATA_POINTERS];
982 * sample aspect ratio for the video frame, 0/1 if unknown\unspecified
984 * - decoding: Read by user.
986 AVRational sample_aspect_ratio;
989 * presentation timestamp in time_base units (time when frame should be shown to user)
990 * If AV_NOPTS_VALUE then frame_rate = 1/time_base will be assumed.
991 * - encoding: MUST be set by user.
992 * - decoding: Set by libavcodec.
997 * reordered pts from the last AVPacket that has been input into the decoder
999 * - decoding: Read by user.
1004 * dts from the last AVPacket that has been input into the decoder
1005 * - encoding: unused
1006 * - decoding: Read by user.
1011 * picture number in bitstream order
1012 * - encoding: set by
1013 * - decoding: Set by libavcodec.
1015 int coded_picture_number;
1017 * picture number in display order
1018 * - encoding: set by
1019 * - decoding: Set by libavcodec.
1021 int display_picture_number;
1024 * quality (between 1 (good) and FF_LAMBDA_MAX (bad))
1025 * - encoding: Set by libavcodec. for coded_picture (and set by user for input).
1026 * - decoding: Set by libavcodec.
1031 * is this picture used as reference
1032 * The values for this are the same as the MpegEncContext.picture_structure
1033 * variable, that is 1->top field, 2->bottom field, 3->frame/both fields.
1034 * Set to 4 for delayed, non-reference frames.
1035 * - encoding: unused
1036 * - decoding: Set by libavcodec. (before get_buffer() call)).
1042 * - encoding: unused
1043 * - decoding: Set by libavcodec.
1045 int8_t *qscale_table;
1048 * - encoding: unused
1049 * - decoding: Set by libavcodec.
1059 * mbskip_table[mb]>=1 if MB didn't change
1060 * stride= mb_width = (width+15)>>4
1061 * - encoding: unused
1062 * - decoding: Set by libavcodec.
1064 uint8_t *mbskip_table;
1067 * motion vector table
1070 * int mv_sample_log2= 4 - motion_subsample_log2;
1071 * int mb_width= (width+15)>>4;
1072 * int mv_stride= (mb_width << mv_sample_log2) + 1;
1073 * motion_val[direction][x + y*mv_stride][0->mv_x, 1->mv_y];
1075 * - encoding: Set by user.
1076 * - decoding: Set by libavcodec.
1078 int16_t (*motion_val[2])[2];
1081 * macroblock type table
1082 * mb_type_base + mb_width + 2
1083 * - encoding: Set by user.
1084 * - decoding: Set by libavcodec.
1090 * - encoding: unused
1091 * - decoding: Set by libavcodec.
1096 * motion reference frame index
1097 * the order in which these are stored can depend on the codec.
1098 * - encoding: Set by user.
1099 * - decoding: Set by libavcodec.
1101 int8_t *ref_index[2];
1104 * for some private data of the user
1105 * - encoding: unused
1106 * - decoding: Set by user.
1112 * - encoding: Set by libavcodec. if flags&CODEC_FLAG_PSNR.
1113 * - decoding: unused
1115 uint64_t error[AV_NUM_DATA_POINTERS];
1118 * type of the buffer (to keep track of who has to deallocate data[*])
1119 * - encoding: Set by the one who allocates it.
1120 * - decoding: Set by the one who allocates it.
1121 * Note: User allocated (direct rendering) & internal buffers cannot coexist currently.
1126 * When decoding, this signals how much the picture must be delayed.
1127 * extra_delay = repeat_pict / (2*fps)
1128 * - encoding: unused
1129 * - decoding: Set by libavcodec.
1134 * The content of the picture is interlaced.
1135 * - encoding: Set by user.
1136 * - decoding: Set by libavcodec. (default 0)
1138 int interlaced_frame;
1141 * If the content is interlaced, is top field displayed first.
1142 * - encoding: Set by user.
1143 * - decoding: Set by libavcodec.
1145 int top_field_first;
1148 * Tell user application that palette has changed from previous frame.
1149 * - encoding: ??? (no palette-enabled encoder yet)
1150 * - decoding: Set by libavcodec. (default 0).
1152 int palette_has_changed;
1155 * codec suggestion on buffer type if != 0
1156 * - encoding: unused
1157 * - decoding: Set by libavcodec. (before get_buffer() call)).
1163 * - encoding: Set by user.
1164 * - decoding: Set by libavcodec.
1166 AVPanScan *pan_scan;
1169 * reordered opaque 64bit (generally an integer or a double precision float
1170 * PTS but can be anything).
1171 * The user sets AVCodecContext.reordered_opaque to represent the input at
1173 * the decoder reorders values as needed and sets AVFrame.reordered_opaque
1174 * to exactly one of the values provided by the user through AVCodecContext.reordered_opaque
1175 * @deprecated in favor of pkt_pts
1176 * - encoding: unused
1177 * - decoding: Read by user.
1179 int64_t reordered_opaque;
1182 * hardware accelerator private data (FFmpeg-allocated)
1183 * - encoding: unused
1184 * - decoding: Set by libavcodec
1186 void *hwaccel_picture_private;
1189 * the AVCodecContext which ff_thread_get_buffer() was last called on
1190 * - encoding: Set by libavcodec.
1191 * - decoding: Set by libavcodec.
1193 struct AVCodecContext *owner;
1196 * used by multithreading to store frame-specific info
1197 * - encoding: Set by libavcodec.
1198 * - decoding: Set by libavcodec.
1200 void *thread_opaque;
1203 * log2 of the size of the block which a single vector in motion_val represents:
1204 * (4->16x16, 3->8x8, 2-> 4x4, 1-> 2x2)
1205 * - encoding: unused
1206 * - decoding: Set by libavcodec.
1208 uint8_t motion_subsample_log2;
1211 * frame timestamp estimated using various heuristics, in stream time base
1212 * Code outside libavcodec should access this field using:
1213 * av_opt_ptr(avcodec_get_frame_class(), frame, "best_effort_timestamp");
1214 * - encoding: unused
1215 * - decoding: set by libavcodec, read by user.
1217 int64_t best_effort_timestamp;
1220 * reordered pos from the last AVPacket that has been input into the decoder
1221 * Code outside libavcodec should access this field using:
1222 * av_opt_ptr(avcodec_get_frame_class(), frame, "pkt_pos");
1223 * - encoding: unused
1224 * - decoding: Read by user.
1229 struct AVCodecInternal;
1233 AV_FIELD_PROGRESSIVE,
1234 AV_FIELD_TT, //< Top coded_first, top displayed first
1235 AV_FIELD_BB, //< Bottom coded first, bottom displayed first
1236 AV_FIELD_TB, //< Top coded first, bottom displayed first
1237 AV_FIELD_BT, //< Bottom coded first, top displayed first
1241 * main external API structure.
1242 * New fields can be added to the end with minor version bumps.
1243 * Removal, reordering and changes to existing fields require a major
1245 * Please use AVOptions (av_opt* / av_set/get*()) to access these fields from user
1247 * sizeof(AVCodecContext) must not be used outside libav*.
1249 typedef struct AVCodecContext {
1251 * information on struct for av_log
1252 * - set by avcodec_alloc_context3
1254 const AVClass *av_class;
1255 int log_level_offset;
1257 enum AVMediaType codec_type; /* see AVMEDIA_TYPE_xxx */
1258 struct AVCodec *codec;
1259 char codec_name[32];
1260 enum CodecID codec_id; /* see CODEC_ID_xxx */
1263 * fourcc (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A').
1264 * This is used to work around some encoder bugs.
1265 * A demuxer should set this to what is stored in the field used to identify the codec.
1266 * If there are multiple such fields in a container then the demuxer should choose the one
1267 * which maximizes the information about the used codec.
1268 * If the codec tag field in a container is larger than 32 bits then the demuxer should
1269 * remap the longer ID to 32 bits with a table or other structure. Alternatively a new
1270 * extra_codec_tag + size could be added but for this a clear advantage must be demonstrated
1272 * - encoding: Set by user, if not then the default based on codec_id will be used.
1273 * - decoding: Set by user, will be converted to uppercase by libavcodec during init.
1275 unsigned int codec_tag;
1278 * fourcc from the AVI stream header (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A').
1279 * This is used to work around some encoder bugs.
1280 * - encoding: unused
1281 * - decoding: Set by user, will be converted to uppercase by libavcodec during init.
1283 unsigned int stream_codec_tag;
1287 * @deprecated this field is unused
1289 attribute_deprecated int sub_id;
1295 * Private context used for internal data.
1297 * Unlike priv_data, this is not codec-specific. It is used in general
1298 * libavcodec functions.
1300 struct AVCodecInternal *internal;
1303 * Private data of the user, can be used to carry app specific stuff.
1304 * - encoding: Set by user.
1305 * - decoding: Set by user.
1310 * the average bitrate
1311 * - encoding: Set by user; unused for constant quantizer encoding.
1312 * - decoding: Set by libavcodec. 0 or some bitrate if this info is available in the stream.
1317 * number of bits the bitstream is allowed to diverge from the reference.
1318 * the reference can be CBR (for CBR pass1) or VBR (for pass2)
1319 * - encoding: Set by user; unused for constant quantizer encoding.
1320 * - decoding: unused
1322 int bit_rate_tolerance;
1325 * Global quality for codecs which cannot change it per frame.
1326 * This should be proportional to MPEG-1/2/4 qscale.
1327 * - encoding: Set by user.
1328 * - decoding: unused
1333 * - encoding: Set by user.
1334 * - decoding: unused
1336 int compression_level;
1337 #define FF_COMPRESSION_DEFAULT -1
1341 * - encoding: Set by user.
1342 * - decoding: Set by user.
1348 * - encoding: Set by user.
1349 * - decoding: Set by user.
1354 * some codecs need / can use extradata like Huffman tables.
1355 * mjpeg: Huffman tables
1356 * rv10: additional flags
1357 * mpeg4: global headers (they can be in the bitstream or here)
1358 * The allocated memory should be FF_INPUT_BUFFER_PADDING_SIZE bytes larger
1359 * than extradata_size to avoid prolems if it is read with the bitstream reader.
1360 * The bytewise contents of extradata must not depend on the architecture or CPU endianness.
1361 * - encoding: Set/allocated/freed by libavcodec.
1362 * - decoding: Set/allocated/freed by user.
1368 * This is the fundamental unit of time (in seconds) in terms
1369 * of which frame timestamps are represented. For fixed-fps content,
1370 * timebase should be 1/framerate and timestamp increments should be
1372 * - encoding: MUST be set by user.
1373 * - decoding: Set by libavcodec.
1375 AVRational time_base;
1378 * For some codecs, the time base is closer to the field rate than the frame rate.
1379 * Most notably, H.264 and MPEG-2 specify time_base as half of frame duration
1380 * if no telecine is used ...
1382 * Set to time_base ticks per frame. Default 1, e.g., H.264/MPEG-2 set it to 2.
1384 int ticks_per_frame;
1387 * Encoding: Number of frames delay there will be from the encoder input to
1388 * the decoder output. (we assume the decoder matches the spec)
1389 * Decoding: Number of frames delay in addition to what a standard decoder
1390 * as specified in the spec would produce.
1393 * Number of frames the decoded output will be delayed relative to the
1397 * Number of "priming" samples added to the beginning of the stream
1398 * during encoding. The decoded output will be delayed by this many
1399 * samples relative to the input to the encoder. Note that this field is
1400 * purely informational and does not directly affect the pts output by
1401 * the encoder, which should always be based on the actual presentation
1402 * time, including any delay.
1404 * - encoding: Set by libavcodec.
1405 * - decoding: Set by libavcodec.
1412 * picture width / height.
1413 * - encoding: MUST be set by user.
1414 * - decoding: Set by libavcodec.
1415 * Note: For compatibility it is possible to set this instead of
1416 * coded_width/height before decoding.
1421 * Bitstream width / height, may be different from width/height if lowres enabled.
1422 * - encoding: unused
1423 * - decoding: Set by user before init if known. Codec should override / dynamically change if needed.
1425 int coded_width, coded_height;
1427 #define FF_ASPECT_EXTENDED 15
1430 * the number of pictures in a group of pictures, or 0 for intra_only
1431 * - encoding: Set by user.
1432 * - decoding: unused
1437 * Pixel format, see PIX_FMT_xxx.
1438 * May be set by the demuxer if known from headers.
1439 * May be overriden by the decoder if it knows better.
1440 * - encoding: Set by user.
1441 * - decoding: Set by user if known, overridden by libavcodec if known
1443 enum PixelFormat pix_fmt;
1446 * Motion estimation algorithm used for video coding.
1447 * 1 (zero), 2 (full), 3 (log), 4 (phods), 5 (epzs), 6 (x1), 7 (hex),
1448 * 8 (umh), 9 (iter), 10 (tesa) [7, 8, 10 are x264 specific, 9 is snow specific]
1449 * - encoding: MUST be set by user.
1450 * - decoding: unused
1455 * If non NULL, 'draw_horiz_band' is called by the libavcodec
1456 * decoder to draw a horizontal band. It improves cache usage. Not
1457 * all codecs can do that. You must check the codec capabilities
1459 * When multithreading is used, it may be called from multiple threads
1460 * at the same time; threads might draw different parts of the same AVFrame,
1461 * or multiple AVFrames, and there is no guarantee that slices will be drawn
1463 * The function is also used by hardware acceleration APIs.
1464 * It is called at least once during frame decoding to pass
1465 * the data needed for hardware render.
1466 * In that mode instead of pixel data, AVFrame points to
1467 * a structure specific to the acceleration API. The application
1468 * reads the structure and can change some fields to indicate progress
1470 * - encoding: unused
1471 * - decoding: Set by user.
1472 * @param height the height of the slice
1473 * @param y the y position of the slice
1474 * @param type 1->top field, 2->bottom field, 3->frame
1475 * @param offset offset into the AVFrame.data from which the slice should be read
1477 void (*draw_horiz_band)(struct AVCodecContext *s,
1478 const AVFrame *src, int offset[AV_NUM_DATA_POINTERS],
1479 int y, int type, int height);
1482 * callback to negotiate the pixelFormat
1483 * @param fmt is the list of formats which are supported by the codec,
1484 * it is terminated by -1 as 0 is a valid format, the formats are ordered by quality.
1485 * The first is always the native one.
1486 * @return the chosen format
1487 * - encoding: unused
1488 * - decoding: Set by user, if not set the native format will be chosen.
1490 enum PixelFormat (*get_format)(struct AVCodecContext *s, const enum PixelFormat * fmt);
1493 * maximum number of B-frames between non-B-frames
1494 * Note: The output will be delayed by max_b_frames+1 relative to the input.
1495 * - encoding: Set by user.
1496 * - decoding: unused
1501 * qscale factor between IP and B-frames
1502 * If > 0 then the last P-frame quantizer will be used (q= lastp_q*factor+offset).
1503 * If < 0 then normal ratecontrol will be done (q= -normal_q*factor+offset).
1504 * - encoding: Set by user.
1505 * - decoding: unused
1507 float b_quant_factor;
1509 /** obsolete FIXME remove */
1511 #define FF_RC_STRATEGY_XVID 1
1513 int b_frame_strategy;
1515 #if FF_API_MPV_GLOBAL_OPTS
1517 * luma single coefficient elimination threshold
1518 * - encoding: Set by user.
1519 * - decoding: unused
1521 attribute_deprecated int luma_elim_threshold;
1524 * chroma single coeff elimination threshold
1525 * - encoding: Set by user.
1526 * - decoding: unused
1528 attribute_deprecated int chroma_elim_threshold;
1532 * qscale offset between IP and B-frames
1533 * - encoding: Set by user.
1534 * - decoding: unused
1536 float b_quant_offset;
1539 * Size of the frame reordering buffer in the decoder.
1540 * For MPEG-2 it is 1 IPB or 0 low delay IP.
1541 * - encoding: Set by libavcodec.
1542 * - decoding: Set by libavcodec.
1547 * 0-> h263 quant 1-> mpeg quant
1548 * - encoding: Set by user.
1549 * - decoding: unused
1554 * qscale factor between P and I-frames
1555 * If > 0 then the last p frame quantizer will be used (q= lastp_q*factor+offset).
1556 * If < 0 then normal ratecontrol will be done (q= -normal_q*factor+offset).
1557 * - encoding: Set by user.
1558 * - decoding: unused
1560 float i_quant_factor;
1563 * qscale offset between P and I-frames
1564 * - encoding: Set by user.
1565 * - decoding: unused
1567 float i_quant_offset;
1570 * luminance masking (0-> disabled)
1571 * - encoding: Set by user.
1572 * - decoding: unused
1577 * temporary complexity masking (0-> disabled)
1578 * - encoding: Set by user.
1579 * - decoding: unused
1581 float temporal_cplx_masking;
1584 * spatial complexity masking (0-> disabled)
1585 * - encoding: Set by user.
1586 * - decoding: unused
1588 float spatial_cplx_masking;
1591 * p block masking (0-> disabled)
1592 * - encoding: Set by user.
1593 * - decoding: unused
1598 * darkness masking (0-> disabled)
1599 * - encoding: Set by user.
1600 * - decoding: unused
1606 * - encoding: Set by libavcodec.
1607 * - decoding: Set by user (or 0).
1611 * prediction method (needed for huffyuv)
1612 * - encoding: Set by user.
1613 * - decoding: unused
1615 int prediction_method;
1616 #define FF_PRED_LEFT 0
1617 #define FF_PRED_PLANE 1
1618 #define FF_PRED_MEDIAN 2
1621 * slice offsets in the frame in bytes
1622 * - encoding: Set/allocated by libavcodec.
1623 * - decoding: Set/allocated by user (or NULL).
1628 * sample aspect ratio (0 if unknown)
1629 * That is the width of a pixel divided by the height of the pixel.
1630 * Numerator and denominator must be relatively prime and smaller than 256 for some video standards.
1631 * - encoding: Set by user.
1632 * - decoding: Set by libavcodec.
1634 AVRational sample_aspect_ratio;
1637 * motion estimation comparison function
1638 * - encoding: Set by user.
1639 * - decoding: unused
1643 * subpixel motion estimation comparison function
1644 * - encoding: Set by user.
1645 * - decoding: unused
1649 * macroblock comparison function (not supported yet)
1650 * - encoding: Set by user.
1651 * - decoding: unused
1655 * interlaced DCT comparison function
1656 * - encoding: Set by user.
1657 * - decoding: unused
1660 #define FF_CMP_SAD 0
1661 #define FF_CMP_SSE 1
1662 #define FF_CMP_SATD 2
1663 #define FF_CMP_DCT 3
1664 #define FF_CMP_PSNR 4
1665 #define FF_CMP_BIT 5
1667 #define FF_CMP_ZERO 7
1668 #define FF_CMP_VSAD 8
1669 #define FF_CMP_VSSE 9
1670 #define FF_CMP_NSSE 10
1671 #define FF_CMP_W53 11
1672 #define FF_CMP_W97 12
1673 #define FF_CMP_DCTMAX 13
1674 #define FF_CMP_DCT264 14
1675 #define FF_CMP_CHROMA 256
1678 * ME diamond size & shape
1679 * - encoding: Set by user.
1680 * - decoding: unused
1685 * amount of previous MV predictors (2a+1 x 2a+1 square)
1686 * - encoding: Set by user.
1687 * - decoding: unused
1689 int last_predictor_count;
1692 * prepass for motion estimation
1693 * - encoding: Set by user.
1694 * - decoding: unused
1699 * motion estimation prepass comparison function
1700 * - encoding: Set by user.
1701 * - decoding: unused
1706 * ME prepass diamond size & shape
1707 * - encoding: Set by user.
1708 * - decoding: unused
1714 * - encoding: Set by user.
1715 * - decoding: unused
1717 int me_subpel_quality;
1720 * DTG active format information (additional aspect ratio
1721 * information only used in DVB MPEG-2 transport streams)
1724 * - encoding: unused
1725 * - decoding: Set by decoder.
1727 int dtg_active_format;
1728 #define FF_DTG_AFD_SAME 8
1729 #define FF_DTG_AFD_4_3 9
1730 #define FF_DTG_AFD_16_9 10
1731 #define FF_DTG_AFD_14_9 11
1732 #define FF_DTG_AFD_4_3_SP_14_9 13
1733 #define FF_DTG_AFD_16_9_SP_14_9 14
1734 #define FF_DTG_AFD_SP_4_3 15
1737 * maximum motion estimation search range in subpel units
1738 * If 0 then no limit.
1740 * - encoding: Set by user.
1741 * - decoding: unused
1746 * intra quantizer bias
1747 * - encoding: Set by user.
1748 * - decoding: unused
1750 int intra_quant_bias;
1751 #define FF_DEFAULT_QUANT_BIAS 999999
1754 * inter quantizer bias
1755 * - encoding: Set by user.
1756 * - decoding: unused
1758 int inter_quant_bias;
1760 #if FF_API_COLOR_TABLE_ID
1763 * - encoding: unused
1764 * - decoding: Which clrtable should be used for 8bit RGB images.
1765 * Tables have to be stored somewhere. FIXME
1767 attribute_deprecated int color_table_id;
1772 * - encoding: unused
1773 * - decoding: Set by user.
1776 #define SLICE_FLAG_CODED_ORDER 0x0001 ///< draw_horiz_band() is called in coded order instead of display
1777 #define SLICE_FLAG_ALLOW_FIELD 0x0002 ///< allow draw_horiz_band() with field slices (MPEG2 field pics)
1778 #define SLICE_FLAG_ALLOW_PLANE 0x0004 ///< allow draw_horiz_band() with 1 component at a time (SVQ1)
1781 * XVideo Motion Acceleration
1782 * - encoding: forbidden
1783 * - decoding: set by decoder
1785 int xvmc_acceleration;
1788 * macroblock decision mode
1789 * - encoding: Set by user.
1790 * - decoding: unused
1793 #define FF_MB_DECISION_SIMPLE 0 ///< uses mb_cmp
1794 #define FF_MB_DECISION_BITS 1 ///< chooses the one which needs the fewest bits
1795 #define FF_MB_DECISION_RD 2 ///< rate distortion
1798 * custom intra quantization matrix
1799 * - encoding: Set by user, can be NULL.
1800 * - decoding: Set by libavcodec.
1802 uint16_t *intra_matrix;
1805 * custom inter quantization matrix
1806 * - encoding: Set by user, can be NULL.
1807 * - decoding: Set by libavcodec.
1809 uint16_t *inter_matrix;
1812 * scene change detection threshold
1813 * 0 is default, larger means fewer detected scene changes.
1814 * - encoding: Set by user.
1815 * - decoding: unused
1817 int scenechange_threshold;
1820 * noise reduction strength
1821 * - encoding: Set by user.
1822 * - decoding: unused
1824 int noise_reduction;
1826 #if FF_API_INTER_THRESHOLD
1828 * @deprecated this field is unused
1830 attribute_deprecated int inter_threshold;
1833 #if FF_API_MPV_GLOBAL_OPTS
1835 * @deprecated use mpegvideo private options instead
1837 attribute_deprecated int quantizer_noise_shaping;
1841 * Motion estimation threshold below which no motion estimation is
1842 * performed, but instead the user specified motion vectors are used.
1844 * - encoding: Set by user.
1845 * - decoding: unused
1850 * Macroblock threshold below which the user specified macroblock types will be used.
1851 * - encoding: Set by user.
1852 * - decoding: unused
1857 * precision of the intra DC coefficient - 8
1858 * - encoding: Set by user.
1859 * - decoding: unused
1861 int intra_dc_precision;
1864 * Number of macroblock rows at the top which are skipped.
1865 * - encoding: unused
1866 * - decoding: Set by user.
1871 * Number of macroblock rows at the bottom which are skipped.
1872 * - encoding: unused
1873 * - decoding: Set by user.
1878 * Border processing masking, raises the quantizer for mbs on the borders
1880 * - encoding: Set by user.
1881 * - decoding: unused
1883 float border_masking;
1886 * minimum MB lagrange multipler
1887 * - encoding: Set by user.
1888 * - decoding: unused
1893 * maximum MB lagrange multipler
1894 * - encoding: Set by user.
1895 * - decoding: unused
1901 * - encoding: Set by user.
1902 * - decoding: unused
1904 int me_penalty_compensation;
1908 * - encoding: Set by user.
1909 * - decoding: unused
1915 * - encoding: Set by user.
1916 * - decoding: unused
1922 * - encoding: Set by user.
1923 * - decoding: unused
1928 * number of reference frames
1929 * - encoding: Set by user.
1930 * - decoding: Set by lavc.
1935 * chroma qp offset from luma
1936 * - encoding: Set by user.
1937 * - decoding: unused
1942 * Multiplied by qscale for each frame and added to scene_change_score.
1943 * - encoding: Set by user.
1944 * - decoding: unused
1946 int scenechange_factor;
1950 * Note: Value depends upon the compare function used for fullpel ME.
1951 * - encoding: Set by user.
1952 * - decoding: unused
1957 * Adjust sensitivity of b_frame_strategy 1.
1958 * - encoding: Set by user.
1959 * - decoding: unused
1964 * Chromaticity coordinates of the source primaries.
1965 * - encoding: Set by user
1966 * - decoding: Set by libavcodec
1968 enum AVColorPrimaries color_primaries;
1971 * Color Transfer Characteristic.
1972 * - encoding: Set by user
1973 * - decoding: Set by libavcodec
1975 enum AVColorTransferCharacteristic color_trc;
1978 * YUV colorspace type.
1979 * - encoding: Set by user
1980 * - decoding: Set by libavcodec
1982 enum AVColorSpace colorspace;
1985 * MPEG vs JPEG YUV range.
1986 * - encoding: Set by user
1987 * - decoding: Set by libavcodec
1989 enum AVColorRange color_range;
1992 * This defines the location of chroma samples.
1993 * - encoding: Set by user
1994 * - decoding: Set by libavcodec
1996 enum AVChromaLocation chroma_sample_location;
2000 * Indicates number of picture subdivisions. Used for parallelized
2002 * - encoding: Set by user
2003 * - decoding: unused
2008 * - encoding: set by libavcodec
2009 * - decoding: Set by libavcodec
2011 enum AVFieldOrder field_order;
2014 int sample_rate; ///< samples per second
2015 int channels; ///< number of audio channels
2018 * audio sample format
2019 * - encoding: Set by user.
2020 * - decoding: Set by libavcodec.
2022 enum AVSampleFormat sample_fmt; ///< sample format
2024 /* The following data should not be initialized. */
2026 * Samples per packet, initialized when calling 'init'.
2031 * Frame counter, set by libavcodec.
2033 * - decoding: total number of frames returned from the decoder so far.
2034 * - encoding: total number of frames passed to the encoder so far.
2036 * @note the counter is not incremented if encoding/decoding resulted in
2042 * number of bytes per packet if constant and known or 0
2043 * Used by some WAV based audio codecs.
2048 * Audio cutoff bandwidth (0 means "automatic")
2049 * - encoding: Set by user.
2050 * - decoding: unused
2054 #if FF_API_REQUEST_CHANNELS
2056 * Decoder should decode to this many channels if it can (0 for default)
2057 * - encoding: unused
2058 * - decoding: Set by user.
2059 * @deprecated Deprecated in favor of request_channel_layout.
2061 int request_channels;
2065 * Audio channel layout.
2066 * - encoding: set by user.
2067 * - decoding: set by user, may be overwritten by libavcodec.
2069 uint64_t channel_layout;
2072 * Request decoder to use this channel layout if it can (0 for default)
2073 * - encoding: unused
2074 * - decoding: Set by user.
2076 uint64_t request_channel_layout;
2079 * Type of service that the audio stream conveys.
2080 * - encoding: Set by user.
2081 * - decoding: Set by libavcodec.
2083 enum AVAudioServiceType audio_service_type;
2086 * desired sample format
2087 * - encoding: Not used.
2088 * - decoding: Set by user.
2089 * Decoder will decode to this format if it can.
2091 enum AVSampleFormat request_sample_fmt;
2094 * Called at the beginning of each frame to get a buffer for it.
2096 * The function will set AVFrame.data[], AVFrame.linesize[].
2097 * AVFrame.extended_data[] must also be set, but it should be the same as
2098 * AVFrame.data[] except for planar audio with more channels than can fit
2099 * in AVFrame.data[]. In that case, AVFrame.data[] shall still contain as
2100 * many data pointers as it can hold.
2102 * if CODEC_CAP_DR1 is not set then get_buffer() must call
2103 * avcodec_default_get_buffer() instead of providing buffers allocated by
2106 * AVFrame.data[] should be 32- or 16-byte-aligned unless the CPU doesn't
2107 * need it. avcodec_default_get_buffer() aligns the output buffer properly,
2108 * but if get_buffer() is overridden then alignment considerations should
2109 * be taken into account.
2111 * @see avcodec_default_get_buffer()
2115 * If pic.reference is set then the frame will be read later by libavcodec.
2116 * avcodec_align_dimensions2() should be used to find the required width and
2117 * height, as they normally need to be rounded up to the next multiple of 16.
2119 * If frame multithreading is used and thread_safe_callbacks is set,
2120 * it may be called from a different thread, but not from more than one at
2121 * once. Does not need to be reentrant.
2123 * @see release_buffer(), reget_buffer()
2124 * @see avcodec_align_dimensions2()
2128 * Decoders request a buffer of a particular size by setting
2129 * AVFrame.nb_samples prior to calling get_buffer(). The decoder may,
2130 * however, utilize only part of the buffer by setting AVFrame.nb_samples
2131 * to a smaller value in the output frame.
2133 * Decoders cannot use the buffer after returning from
2134 * avcodec_decode_audio4(), so they will not call release_buffer(), as it
2135 * is assumed to be released immediately upon return.
2137 * As a convenience, av_samples_get_buffer_size() and
2138 * av_samples_fill_arrays() in libavutil may be used by custom get_buffer()
2139 * functions to find the required data size and to fill data pointers and
2140 * linesize. In AVFrame.linesize, only linesize[0] may be set for audio
2141 * since all planes must be the same size.
2143 * @see av_samples_get_buffer_size(), av_samples_fill_arrays()
2145 * - encoding: unused
2146 * - decoding: Set by libavcodec, user can override.
2148 int (*get_buffer)(struct AVCodecContext *c, AVFrame *pic);
2151 * Called to release buffers which were allocated with get_buffer.
2152 * A released buffer can be reused in get_buffer().
2153 * pic.data[*] must be set to NULL.
2154 * May be called from a different thread if frame multithreading is used,
2155 * but not by more than one thread at once, so does not need to be reentrant.
2156 * - encoding: unused
2157 * - decoding: Set by libavcodec, user can override.
2159 void (*release_buffer)(struct AVCodecContext *c, AVFrame *pic);
2162 * Called at the beginning of a frame to get cr buffer for it.
2163 * Buffer type (size, hints) must be the same. libavcodec won't check it.
2164 * libavcodec will pass previous buffer in pic, function should return
2165 * same buffer or new buffer with old frame "painted" into it.
2166 * If pic.data[0] == NULL must behave like get_buffer().
2167 * if CODEC_CAP_DR1 is not set then reget_buffer() must call
2168 * avcodec_default_reget_buffer() instead of providing buffers allocated by
2170 * - encoding: unused
2171 * - decoding: Set by libavcodec, user can override.
2173 int (*reget_buffer)(struct AVCodecContext *c, AVFrame *pic);
2176 /* - encoding parameters */
2177 float qcompress; ///< amount of qscale change between easy & hard scenes (0.0-1.0)
2178 float qblur; ///< amount of qscale smoothing over time (0.0-1.0)
2182 * - encoding: Set by user.
2183 * - decoding: unused
2189 * - encoding: Set by user.
2190 * - decoding: unused
2195 * maximum quantizer difference between frames
2196 * - encoding: Set by user.
2197 * - decoding: unused
2202 * ratecontrol qmin qmax limiting method
2203 * 0-> clipping, 1-> use a nice continous function to limit qscale wthin qmin/qmax.
2204 * - encoding: Set by user.
2205 * - decoding: unused
2213 * decoder bitstream buffer size
2214 * - encoding: Set by user.
2215 * - decoding: unused
2220 * ratecontrol override, see RcOverride
2221 * - encoding: Allocated/set/freed by user.
2222 * - decoding: unused
2224 int rc_override_count;
2225 RcOverride *rc_override;
2228 * rate control equation
2229 * - encoding: Set by user
2230 * - decoding: unused
2236 * - encoding: Set by user.
2237 * - decoding: unused
2243 * - encoding: Set by user.
2244 * - decoding: unused
2248 float rc_buffer_aggressivity;
2251 * initial complexity for pass1 ratecontrol
2252 * - encoding: Set by user.
2253 * - decoding: unused
2255 float rc_initial_cplx;
2258 * Ratecontrol attempt to use, at maximum, <value> of what can be used without an underflow.
2259 * - encoding: Set by user.
2260 * - decoding: unused.
2262 float rc_max_available_vbv_use;
2265 * Ratecontrol attempt to use, at least, <value> times the amount needed to prevent a vbv overflow.
2266 * - encoding: Set by user.
2267 * - decoding: unused.
2269 float rc_min_vbv_overflow_use;
2272 * Number of bits which should be loaded into the rc buffer before decoding starts.
2273 * - encoding: Set by user.
2274 * - decoding: unused
2276 int rc_initial_buffer_occupancy;
2278 #define FF_CODER_TYPE_VLC 0
2279 #define FF_CODER_TYPE_AC 1
2280 #define FF_CODER_TYPE_RAW 2
2281 #define FF_CODER_TYPE_RLE 3
2282 #define FF_CODER_TYPE_DEFLATE 4
2285 * - encoding: Set by user.
2286 * - decoding: unused
2292 * - encoding: Set by user.
2293 * - decoding: unused
2298 * minimum Lagrange multipler
2299 * - encoding: Set by user.
2300 * - decoding: unused
2305 * maximum Lagrange multipler
2306 * - encoding: Set by user.
2307 * - decoding: unused
2312 * frame skip threshold
2313 * - encoding: Set by user.
2314 * - decoding: unused
2316 int frame_skip_threshold;
2320 * - encoding: Set by user.
2321 * - decoding: unused
2323 int frame_skip_factor;
2326 * frame skip exponent
2327 * - encoding: Set by user.
2328 * - decoding: unused
2333 * frame skip comparison function
2334 * - encoding: Set by user.
2335 * - decoding: unused
2340 * trellis RD quantization
2341 * - encoding: Set by user.
2342 * - decoding: unused
2347 * - encoding: Set by user.
2348 * - decoding: unused
2350 int min_prediction_order;
2353 * - encoding: Set by user.
2354 * - decoding: unused
2356 int max_prediction_order;
2359 * GOP timecode frame start number
2360 * - encoding: Set by user, in non drop frame format
2361 * - decoding: Set by libavcodec (timecode in the 25 bits format, -1 if unset)
2363 int64_t timecode_frame_start;
2365 /* The RTP callback: This function is called */
2366 /* every time the encoder has a packet to send. */
2367 /* It depends on the encoder if the data starts */
2368 /* with a Start Code (it should). H.263 does. */
2369 /* mb_nb contains the number of macroblocks */
2370 /* encoded in the RTP payload. */
2371 void (*rtp_callback)(struct AVCodecContext *avctx, void *data, int size, int mb_nb);
2373 int rtp_payload_size; /* The size of the RTP payload: the coder will */
2374 /* do its best to deliver a chunk with size */
2375 /* below rtp_payload_size, the chunk will start */
2376 /* with a start code on some codecs like H.263. */
2377 /* This doesn't take account of any particular */
2378 /* headers inside the transmitted RTP payload. */
2380 /* statistics, used for 2-pass encoding */
2391 * number of bits used for the previously encoded frame
2392 * - encoding: Set by libavcodec.
2393 * - decoding: unused
2398 * pass1 encoding statistics output buffer
2399 * - encoding: Set by libavcodec.
2400 * - decoding: unused
2405 * pass2 encoding statistics input buffer
2406 * Concatenated stuff from stats_out of pass1 should be placed here.
2407 * - encoding: Allocated/set/freed by user.
2408 * - decoding: unused
2413 * Work around bugs in encoders which sometimes cannot be detected automatically.
2414 * - encoding: Set by user
2415 * - decoding: Set by user
2417 int workaround_bugs;
2418 #define FF_BUG_AUTODETECT 1 ///< autodetection
2419 #define FF_BUG_OLD_MSMPEG4 2
2420 #define FF_BUG_XVID_ILACE 4
2421 #define FF_BUG_UMP4 8
2422 #define FF_BUG_NO_PADDING 16
2423 #define FF_BUG_AMV 32
2424 #define FF_BUG_AC_VLC 0 ///< Will be removed, libavcodec can now handle these non-compliant files by default.
2425 #define FF_BUG_QPEL_CHROMA 64
2426 #define FF_BUG_STD_QPEL 128
2427 #define FF_BUG_QPEL_CHROMA2 256
2428 #define FF_BUG_DIRECT_BLOCKSIZE 512
2429 #define FF_BUG_EDGE 1024
2430 #define FF_BUG_HPEL_CHROMA 2048
2431 #define FF_BUG_DC_CLIP 4096
2432 #define FF_BUG_MS 8192 ///< Work around various bugs in Microsoft's broken decoders.
2433 #define FF_BUG_TRUNCATED 16384
2436 * strictly follow the standard (MPEG4, ...).
2437 * - encoding: Set by user.
2438 * - decoding: Set by user.
2439 * Setting this to STRICT or higher means the encoder and decoder will
2440 * generally do stupid things, whereas setting it to unofficial or lower
2441 * will mean the encoder might produce output that is not supported by all
2442 * spec-compliant decoders. Decoders don't differentiate between normal,
2443 * unofficial and experimental (that is, they always try to decode things
2444 * when they can) unless they are explicitly asked to behave stupidly
2445 * (=strictly conform to the specs)
2447 int strict_std_compliance;
2448 #define FF_COMPLIANCE_VERY_STRICT 2 ///< Strictly conform to an older more strict version of the spec or reference software.
2449 #define FF_COMPLIANCE_STRICT 1 ///< Strictly conform to all the things in the spec no matter what consequences.
2450 #define FF_COMPLIANCE_NORMAL 0
2451 #define FF_COMPLIANCE_UNOFFICIAL -1 ///< Allow unofficial extensions
2452 #define FF_COMPLIANCE_EXPERIMENTAL -2 ///< Allow nonstandardized experimental things.
2455 * error concealment flags
2456 * - encoding: unused
2457 * - decoding: Set by user.
2459 int error_concealment;
2460 #define FF_EC_GUESS_MVS 1
2461 #define FF_EC_DEBLOCK 2
2465 * - encoding: Set by user.
2466 * - decoding: Set by user.
2469 #define FF_DEBUG_PICT_INFO 1
2470 #define FF_DEBUG_RC 2
2471 #define FF_DEBUG_BITSTREAM 4
2472 #define FF_DEBUG_MB_TYPE 8
2473 #define FF_DEBUG_QP 16
2474 #define FF_DEBUG_MV 32
2475 #define FF_DEBUG_DCT_COEFF 0x00000040
2476 #define FF_DEBUG_SKIP 0x00000080
2477 #define FF_DEBUG_STARTCODE 0x00000100
2478 #define FF_DEBUG_PTS 0x00000200
2479 #define FF_DEBUG_ER 0x00000400
2480 #define FF_DEBUG_MMCO 0x00000800
2481 #define FF_DEBUG_BUGS 0x00001000
2482 #define FF_DEBUG_VIS_QP 0x00002000
2483 #define FF_DEBUG_VIS_MB_TYPE 0x00004000
2484 #define FF_DEBUG_BUFFERS 0x00008000
2485 #define FF_DEBUG_THREADS 0x00010000
2489 * - encoding: Set by user.
2490 * - decoding: Set by user.
2493 #define FF_DEBUG_VIS_MV_P_FOR 0x00000001 //visualize forward predicted MVs of P frames
2494 #define FF_DEBUG_VIS_MV_B_FOR 0x00000002 //visualize forward predicted MVs of B frames
2495 #define FF_DEBUG_VIS_MV_B_BACK 0x00000004 //visualize backward predicted MVs of B frames
2498 * Error recognition; may misdetect some more or less valid parts as errors.
2499 * - encoding: unused
2500 * - decoding: Set by user.
2502 int err_recognition;
2503 #define AV_EF_CRCCHECK (1<<0)
2504 #define AV_EF_BITSTREAM (1<<1)
2505 #define AV_EF_BUFFER (1<<2)
2506 #define AV_EF_EXPLODE (1<<3)
2508 #define AV_EF_CAREFUL (1<<16)
2509 #define AV_EF_COMPLIANT (1<<17)
2510 #define AV_EF_AGGRESSIVE (1<<18)
2514 * opaque 64bit number (generally a PTS) that will be reordered and
2515 * output in AVFrame.reordered_opaque
2516 * @deprecated in favor of pkt_pts
2517 * - encoding: unused
2518 * - decoding: Set by user.
2520 int64_t reordered_opaque;
2523 * Hardware accelerator in use
2524 * - encoding: unused.
2525 * - decoding: Set by libavcodec
2527 struct AVHWAccel *hwaccel;
2530 * Hardware accelerator context.
2531 * For some hardware accelerators, a global context needs to be
2532 * provided by the user. In that case, this holds display-dependent
2533 * data FFmpeg cannot instantiate itself. Please refer to the
2534 * FFmpeg HW accelerator documentation to know how to fill this
2535 * is. e.g. for VA API, this is a struct vaapi_context.
2536 * - encoding: unused
2537 * - decoding: Set by user
2539 void *hwaccel_context;
2543 * - encoding: Set by libavcodec if flags&CODEC_FLAG_PSNR.
2544 * - decoding: unused
2546 uint64_t error[AV_NUM_DATA_POINTERS];
2549 * DCT algorithm, see FF_DCT_* below
2550 * - encoding: Set by user.
2551 * - decoding: unused
2554 #define FF_DCT_AUTO 0
2555 #define FF_DCT_FASTINT 1
2556 #define FF_DCT_INT 2
2557 #define FF_DCT_MMX 3
2558 #define FF_DCT_ALTIVEC 5
2559 #define FF_DCT_FAAN 6
2562 * IDCT algorithm, see FF_IDCT_* below.
2563 * - encoding: Set by user.
2564 * - decoding: Set by user.
2567 #define FF_IDCT_AUTO 0
2568 #define FF_IDCT_INT 1
2569 #define FF_IDCT_SIMPLE 2
2570 #define FF_IDCT_SIMPLEMMX 3
2571 #define FF_IDCT_LIBMPEG2MMX 4
2572 #define FF_IDCT_MMI 5
2573 #define FF_IDCT_ARM 7
2574 #define FF_IDCT_ALTIVEC 8
2575 #define FF_IDCT_SH4 9
2576 #define FF_IDCT_SIMPLEARM 10
2577 #define FF_IDCT_H264 11
2578 #define FF_IDCT_VP3 12
2579 #define FF_IDCT_IPP 13
2580 #define FF_IDCT_XVIDMMX 14
2581 #define FF_IDCT_CAVS 15
2582 #define FF_IDCT_SIMPLEARMV5TE 16
2583 #define FF_IDCT_SIMPLEARMV6 17
2584 #define FF_IDCT_SIMPLEVIS 18
2585 #define FF_IDCT_WMV2 19
2586 #define FF_IDCT_FAAN 20
2587 #define FF_IDCT_EA 21
2588 #define FF_IDCT_SIMPLENEON 22
2589 #define FF_IDCT_SIMPLEALPHA 23
2590 #define FF_IDCT_BINK 24
2593 * dsp_mask could be add used to disable unwanted CPU features
2594 * CPU features (i.e. MMX, SSE. ...)
2596 * With the FORCE flag you may instead enable given CPU features.
2597 * (Dangerous: Usable in case of misdetection, improper usage however will
2598 * result into program crash.)
2603 * bits per sample/pixel from the demuxer (needed for huffyuv).
2604 * - encoding: Set by libavcodec.
2605 * - decoding: Set by user.
2607 int bits_per_coded_sample;
2610 * Bits per sample/pixel of internal libavcodec pixel/sample format.
2611 * - encoding: set by user.
2612 * - decoding: set by libavcodec.
2614 int bits_per_raw_sample;
2617 * low resolution decoding, 1-> 1/2 size, 2->1/4 size
2618 * - encoding: unused
2619 * - decoding: Set by user.
2624 * the picture in the bitstream
2625 * - encoding: Set by libavcodec.
2626 * - decoding: Set by libavcodec.
2628 AVFrame *coded_frame;
2632 * is used to decide how many independent tasks should be passed to execute()
2633 * - encoding: Set by user.
2634 * - decoding: Set by user.
2639 * Which multithreading methods to use.
2640 * Use of FF_THREAD_FRAME will increase decoding delay by one frame per thread,
2641 * so clients which cannot provide future frames should not use it.
2643 * - encoding: Set by user, otherwise the default is used.
2644 * - decoding: Set by user, otherwise the default is used.
2647 #define FF_THREAD_FRAME 1 ///< Decode more than one frame at once
2648 #define FF_THREAD_SLICE 2 ///< Decode more than one part of a single frame at once
2651 * Which multithreading methods are in use by the codec.
2652 * - encoding: Set by libavcodec.
2653 * - decoding: Set by libavcodec.
2655 int active_thread_type;
2658 * Set by the client if its custom get_buffer() callback can be called
2659 * from another thread, which allows faster multithreaded decoding.
2660 * draw_horiz_band() will be called from other threads regardless of this setting.
2661 * Ignored if the default get_buffer() is used.
2662 * - encoding: Set by user.
2663 * - decoding: Set by user.
2665 int thread_safe_callbacks;
2668 * The codec may call this to execute several independent things.
2669 * It will return only after finishing all tasks.
2670 * The user may replace this with some multithreaded implementation,
2671 * the default implementation will execute the parts serially.
2672 * @param count the number of things to execute
2673 * - encoding: Set by libavcodec, user can override.
2674 * - decoding: Set by libavcodec, user can override.
2676 int (*execute)(struct AVCodecContext *c, int (*func)(struct AVCodecContext *c2, void *arg), void *arg2, int *ret, int count, int size);
2679 * The codec may call this to execute several independent things.
2680 * It will return only after finishing all tasks.
2681 * The user may replace this with some multithreaded implementation,
2682 * the default implementation will execute the parts serially.
2683 * Also see avcodec_thread_init and e.g. the --enable-pthread configure option.
2684 * @param c context passed also to func
2685 * @param count the number of things to execute
2686 * @param arg2 argument passed unchanged to func
2687 * @param ret return values of executed functions, must have space for "count" values. May be NULL.
2688 * @param func function that will be called count times, with jobnr from 0 to count-1.
2689 * threadnr will be in the range 0 to c->thread_count-1 < MAX_THREADS and so that no
2690 * two instances of func executing at the same time will have the same threadnr.
2691 * @return always 0 currently, but code should handle a future improvement where when any call to func
2692 * returns < 0 no further calls to func may be done and < 0 is returned.
2693 * - encoding: Set by libavcodec, user can override.
2694 * - decoding: Set by libavcodec, user can override.
2696 int (*execute2)(struct AVCodecContext *c, int (*func)(struct AVCodecContext *c2, void *arg, int jobnr, int threadnr), void *arg2, int *ret, int count);
2700 * Can be used by execute() to store some per AVCodecContext stuff.
2701 * - encoding: set by execute()
2702 * - decoding: set by execute()
2704 void *thread_opaque;
2707 * noise vs. sse weight for the nsse comparsion function
2708 * - encoding: Set by user.
2709 * - decoding: unused
2715 * - encoding: Set by user.
2716 * - decoding: Set by libavcodec.
2719 #define FF_PROFILE_UNKNOWN -99
2720 #define FF_PROFILE_RESERVED -100
2722 #define FF_PROFILE_AAC_MAIN 0
2723 #define FF_PROFILE_AAC_LOW 1
2724 #define FF_PROFILE_AAC_SSR 2
2725 #define FF_PROFILE_AAC_LTP 3
2727 #define FF_PROFILE_DTS 20
2728 #define FF_PROFILE_DTS_ES 30
2729 #define FF_PROFILE_DTS_96_24 40
2730 #define FF_PROFILE_DTS_HD_HRA 50
2731 #define FF_PROFILE_DTS_HD_MA 60
2733 #define FF_PROFILE_MPEG2_422 0
2734 #define FF_PROFILE_MPEG2_HIGH 1
2735 #define FF_PROFILE_MPEG2_SS 2
2736 #define FF_PROFILE_MPEG2_SNR_SCALABLE 3
2737 #define FF_PROFILE_MPEG2_MAIN 4
2738 #define FF_PROFILE_MPEG2_SIMPLE 5
2740 #define FF_PROFILE_H264_CONSTRAINED (1<<9) // 8+1; constraint_set1_flag
2741 #define FF_PROFILE_H264_INTRA (1<<11) // 8+3; constraint_set3_flag
2743 #define FF_PROFILE_H264_BASELINE 66
2744 #define FF_PROFILE_H264_CONSTRAINED_BASELINE (66|FF_PROFILE_H264_CONSTRAINED)
2745 #define FF_PROFILE_H264_MAIN 77
2746 #define FF_PROFILE_H264_EXTENDED 88
2747 #define FF_PROFILE_H264_HIGH 100
2748 #define FF_PROFILE_H264_HIGH_10 110
2749 #define FF_PROFILE_H264_HIGH_10_INTRA (110|FF_PROFILE_H264_INTRA)
2750 #define FF_PROFILE_H264_HIGH_422 122
2751 #define FF_PROFILE_H264_HIGH_422_INTRA (122|FF_PROFILE_H264_INTRA)
2752 #define FF_PROFILE_H264_HIGH_444 144
2753 #define FF_PROFILE_H264_HIGH_444_PREDICTIVE 244
2754 #define FF_PROFILE_H264_HIGH_444_INTRA (244|FF_PROFILE_H264_INTRA)
2755 #define FF_PROFILE_H264_CAVLC_444 44
2757 #define FF_PROFILE_VC1_SIMPLE 0
2758 #define FF_PROFILE_VC1_MAIN 1
2759 #define FF_PROFILE_VC1_COMPLEX 2
2760 #define FF_PROFILE_VC1_ADVANCED 3
2762 #define FF_PROFILE_MPEG4_SIMPLE 0
2763 #define FF_PROFILE_MPEG4_SIMPLE_SCALABLE 1
2764 #define FF_PROFILE_MPEG4_CORE 2
2765 #define FF_PROFILE_MPEG4_MAIN 3
2766 #define FF_PROFILE_MPEG4_N_BIT 4
2767 #define FF_PROFILE_MPEG4_SCALABLE_TEXTURE 5
2768 #define FF_PROFILE_MPEG4_SIMPLE_FACE_ANIMATION 6
2769 #define FF_PROFILE_MPEG4_BASIC_ANIMATED_TEXTURE 7
2770 #define FF_PROFILE_MPEG4_HYBRID 8
2771 #define FF_PROFILE_MPEG4_ADVANCED_REAL_TIME 9
2772 #define FF_PROFILE_MPEG4_CORE_SCALABLE 10
2773 #define FF_PROFILE_MPEG4_ADVANCED_CODING 11
2774 #define FF_PROFILE_MPEG4_ADVANCED_CORE 12
2775 #define FF_PROFILE_MPEG4_ADVANCED_SCALABLE_TEXTURE 13
2776 #define FF_PROFILE_MPEG4_SIMPLE_STUDIO 14
2777 #define FF_PROFILE_MPEG4_ADVANCED_SIMPLE 15
2781 * - encoding: Set by user.
2782 * - decoding: Set by libavcodec.
2785 #define FF_LEVEL_UNKNOWN -99
2789 * - encoding: unused
2790 * - decoding: Set by user.
2792 enum AVDiscard skip_loop_filter;
2796 * - encoding: unused
2797 * - decoding: Set by user.
2799 enum AVDiscard skip_idct;
2803 * - encoding: unused
2804 * - decoding: Set by user.
2806 enum AVDiscard skip_frame;
2809 * Header containing style information for text subtitles.
2810 * For SUBTITLE_ASS subtitle type, it should contain the whole ASS
2811 * [Script Info] and [V4+ Styles] section, plus the [Events] line and
2812 * the Format line following. It shouldn't include any Dialogue line.
2813 * - encoding: Set/allocated/freed by user (before avcodec_open2())
2814 * - decoding: Set/allocated/freed by libavcodec (by avcodec_open2())
2816 uint8_t *subtitle_header;
2817 int subtitle_header_size;
2820 * Simulates errors in the bitstream to test error concealment.
2821 * - encoding: Set by user.
2822 * - decoding: unused
2827 * Current packet as passed into the decoder, to avoid having
2828 * to pass the packet into every function. Currently only valid
2829 * inside lavc and get/release_buffer callbacks.
2830 * - decoding: set by avcodec_decode_*, read by get_buffer() for setting pkt_pts
2831 * - encoding: unused
2836 * VBV delay coded in the last frame (in periods of a 27 MHz clock).
2837 * Used for compliant TS muxing.
2838 * - encoding: Set by libavcodec.
2839 * - decoding: unused.
2844 * Current statistics for PTS correction.
2845 * - decoding: maintained and used by libavcodec, not intended to be used by user apps
2846 * - encoding: unused
2848 int64_t pts_correction_num_faulty_pts; /// Number of incorrect PTS values so far
2849 int64_t pts_correction_num_faulty_dts; /// Number of incorrect DTS values so far
2850 int64_t pts_correction_last_pts; /// PTS of the last frame
2851 int64_t pts_correction_last_dts; /// DTS of the last frame
2857 typedef struct AVProfile {
2859 const char *name; ///< short name for the profile
2862 typedef struct AVCodecDefault AVCodecDefault;
2867 typedef struct AVCodec {
2869 * Name of the codec implementation.
2870 * The name is globally unique among encoders and among decoders (but an
2871 * encoder and a decoder can share the same name).
2872 * This is the primary way to find a codec from the user perspective.
2876 * Descriptive name for the codec, meant to be more human readable than name.
2877 * You should use the NULL_IF_CONFIG_SMALL() macro to define it.
2879 const char *long_name;
2880 enum AVMediaType type;
2883 * Codec capabilities.
2887 const AVRational *supported_framerates; ///< array of supported framerates, or NULL if any, array is terminated by {0,0}
2888 const enum PixelFormat *pix_fmts; ///< array of supported pixel formats, or NULL if unknown, array is terminated by -1
2889 const int *supported_samplerates; ///< array of supported audio samplerates, or NULL if unknown, array is terminated by 0
2890 const enum AVSampleFormat *sample_fmts; ///< array of supported sample formats, or NULL if unknown, array is terminated by -1
2891 const uint64_t *channel_layouts; ///< array of support channel layouts, or NULL if unknown. array is terminated by 0
2892 uint8_t max_lowres; ///< maximum value for lowres supported by the decoder
2893 const AVClass *priv_class; ///< AVClass for the private context
2894 const AVProfile *profiles; ///< array of recognized profiles, or NULL if unknown, array is terminated by {FF_PROFILE_UNKNOWN}
2896 /*****************************************************************
2897 * No fields below this line are part of the public API. They
2898 * may not be used outside of libavcodec and can be changed and
2900 * New public fields should be added right above.
2901 *****************************************************************
2904 struct AVCodec *next;
2906 * @name Frame-level threading support functions
2910 * If defined, called on thread contexts when they are created.
2911 * If the codec allocates writable tables in init(), re-allocate them here.
2912 * priv_data will be set to a copy of the original.
2914 int (*init_thread_copy)(AVCodecContext *);
2916 * Copy necessary context variables from a previous thread context to the current one.
2917 * If not defined, the next thread will start automatically; otherwise, the codec
2918 * must call ff_thread_finish_setup().
2920 * dst and src will (rarely) point to the same context, in which case memcpy should be skipped.
2922 int (*update_thread_context)(AVCodecContext *dst, const AVCodecContext *src);
2926 * Private codec-specific defaults.
2928 const AVCodecDefault *defaults;
2931 * Initialize codec static data, called from avcodec_register().
2933 void (*init_static_data)(struct AVCodec *codec);
2935 int (*init)(AVCodecContext *);
2936 int (*encode)(AVCodecContext *, uint8_t *buf, int buf_size, void *data);
2938 * Encode data to an AVPacket.
2940 * @param avctx codec context
2941 * @param avpkt output AVPacket (may contain a user-provided buffer)
2942 * @param[in] frame AVFrame containing the raw data to be encoded
2943 * @param[out] got_packet_ptr encoder sets to 0 or 1 to indicate that a
2944 * non-empty packet was returned in avpkt.
2945 * @return 0 on success, negative error code on failure
2947 int (*encode2)(AVCodecContext *avctx, AVPacket *avpkt, const AVFrame *frame,
2948 int *got_packet_ptr);
2949 int (*decode)(AVCodecContext *, void *outdata, int *outdata_size, AVPacket *avpkt);
2950 int (*close)(AVCodecContext *);
2953 * Will be called when seeking
2955 void (*flush)(AVCodecContext *);
2961 typedef struct AVHWAccel {
2963 * Name of the hardware accelerated codec.
2964 * The name is globally unique among encoders and among decoders (but an
2965 * encoder and a decoder can share the same name).
2970 * Type of codec implemented by the hardware accelerator.
2972 * See AVMEDIA_TYPE_xxx
2974 enum AVMediaType type;
2977 * Codec implemented by the hardware accelerator.
2984 * Supported pixel format.
2986 * Only hardware accelerated formats are supported here.
2988 enum PixelFormat pix_fmt;
2991 * Hardware accelerated codec capabilities.
2992 * see FF_HWACCEL_CODEC_CAP_*
2996 struct AVHWAccel *next;
2999 * Called at the beginning of each frame or field picture.
3001 * Meaningful frame information (codec specific) is guaranteed to
3002 * be parsed at this point. This function is mandatory.
3004 * Note that buf can be NULL along with buf_size set to 0.
3005 * Otherwise, this means the whole frame is available at this point.
3007 * @param avctx the codec context
3008 * @param buf the frame data buffer base
3009 * @param buf_size the size of the frame in bytes
3010 * @return zero if successful, a negative value otherwise
3012 int (*start_frame)(AVCodecContext *avctx, const uint8_t *buf, uint32_t buf_size);
3015 * Callback for each slice.
3017 * Meaningful slice information (codec specific) is guaranteed to
3018 * be parsed at this point. This function is mandatory.
3020 * @param avctx the codec context
3021 * @param buf the slice data buffer base
3022 * @param buf_size the size of the slice in bytes
3023 * @return zero if successful, a negative value otherwise
3025 int (*decode_slice)(AVCodecContext *avctx, const uint8_t *buf, uint32_t buf_size);
3028 * Called at the end of each frame or field picture.
3030 * The whole picture is parsed at this point and can now be sent
3031 * to the hardware accelerator. This function is mandatory.
3033 * @param avctx the codec context
3034 * @return zero if successful, a negative value otherwise
3036 int (*end_frame)(AVCodecContext *avctx);
3039 * Size of HW accelerator private data.
3041 * Private data is allocated with av_mallocz() before
3042 * AVCodecContext.get_buffer() and deallocated after
3043 * AVCodecContext.release_buffer().
3049 * four components are given, that's all.
3050 * the last component is alpha
3052 typedef struct AVPicture {
3053 uint8_t *data[AV_NUM_DATA_POINTERS];
3054 int linesize[AV_NUM_DATA_POINTERS]; ///< number of bytes per line
3057 #define AVPALETTE_SIZE 1024
3058 #define AVPALETTE_COUNT 256
3060 enum AVSubtitleType {
3063 SUBTITLE_BITMAP, ///< A bitmap, pict will be set
3066 * Plain text, the text field must be set by the decoder and is
3067 * authoritative. ass and pict fields may contain approximations.
3072 * Formatted text, the ass field must be set by the decoder and is
3073 * authoritative. pict and text fields may contain approximations.
3078 typedef struct AVSubtitleRect {
3079 int x; ///< top left corner of pict, undefined when pict is not set
3080 int y; ///< top left corner of pict, undefined when pict is not set
3081 int w; ///< width of pict, undefined when pict is not set
3082 int h; ///< height of pict, undefined when pict is not set
3083 int nb_colors; ///< number of colors in pict, undefined when pict is not set
3086 * data+linesize for the bitmap of this subtitle.
3087 * can be set for text/ass as well once they where rendered
3090 enum AVSubtitleType type;
3092 char *text; ///< 0 terminated plain UTF-8 text
3095 * 0 terminated ASS/SSA compatible event line.
3096 * The pressentation of this is unaffected by the other values in this
3102 typedef struct AVSubtitle {
3103 uint16_t format; /* 0 = graphics */
3104 uint32_t start_display_time; /* relative to packet pts, in ms */
3105 uint32_t end_display_time; /* relative to packet pts, in ms */
3107 AVSubtitleRect **rects;
3108 int64_t pts; ///< Same as packet pts, in AV_TIME_BASE
3111 /* packet functions */
3114 * @deprecated use NULL instead
3116 attribute_deprecated void av_destruct_packet_nofree(AVPacket *pkt);
3119 * Default packet destructor.
3121 void av_destruct_packet(AVPacket *pkt);
3124 * Initialize optional fields of a packet with default values.
3128 void av_init_packet(AVPacket *pkt);
3131 * Allocate the payload of a packet and initialize its fields with
3135 * @param size wanted payload size
3136 * @return 0 if OK, AVERROR_xxx otherwise
3138 int av_new_packet(AVPacket *pkt, int size);
3141 * Reduce packet size, correctly zeroing padding
3144 * @param size new size
3146 void av_shrink_packet(AVPacket *pkt, int size);
3149 * Increase packet size, correctly zeroing padding
3152 * @param grow_by number of bytes by which to increase the size of the packet
3154 int av_grow_packet(AVPacket *pkt, int grow_by);
3157 * @warning This is a hack - the packet memory allocation stuff is broken. The
3158 * packet is allocated if it was not really allocated.
3160 int av_dup_packet(AVPacket *pkt);
3165 * @param pkt packet to free
3167 void av_free_packet(AVPacket *pkt);
3170 * Allocate new information of a packet.
3173 * @param type side information type
3174 * @param size side information size
3175 * @return pointer to fresh allocated data or NULL otherwise
3177 uint8_t* av_packet_new_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
3181 * Shrink the already allocated side data buffer
3184 * @param type side information type
3185 * @param size new side information size
3186 * @return 0 on success, < 0 on failure
3188 int av_packet_shrink_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
3192 * Get side information from packet.
3195 * @param type desired side information type
3196 * @param size pointer for side information size to store (optional)
3197 * @return pointer to data if present or NULL otherwise
3199 uint8_t* av_packet_get_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
3202 int av_packet_merge_side_data(AVPacket *pkt);
3204 int av_packet_split_side_data(AVPacket *pkt);
3209 struct ReSampleContext;
3210 struct AVResampleContext;
3212 typedef struct ReSampleContext ReSampleContext;
3215 * Initialize audio resampling context.
3217 * @param output_channels number of output channels
3218 * @param input_channels number of input channels
3219 * @param output_rate output sample rate
3220 * @param input_rate input sample rate
3221 * @param sample_fmt_out requested output sample format
3222 * @param sample_fmt_in input sample format
3223 * @param filter_length length of each FIR filter in the filterbank relative to the cutoff frequency
3224 * @param log2_phase_count log2 of the number of entries in the polyphase filterbank
3225 * @param linear if 1 then the used FIR filter will be linearly interpolated
3226 between the 2 closest, if 0 the closest will be used
3227 * @param cutoff cutoff frequency, 1.0 corresponds to half the output sampling rate
3228 * @return allocated ReSampleContext, NULL if error occurred
3230 ReSampleContext *av_audio_resample_init(int output_channels, int input_channels,
3231 int output_rate, int input_rate,
3232 enum AVSampleFormat sample_fmt_out,
3233 enum AVSampleFormat sample_fmt_in,
3234 int filter_length, int log2_phase_count,
3235 int linear, double cutoff);
3237 int audio_resample(ReSampleContext *s, short *output, short *input, int nb_samples);
3240 * Free resample context.
3242 * @param s a non-NULL pointer to a resample context previously
3243 * created with av_audio_resample_init()
3245 void audio_resample_close(ReSampleContext *s);
3249 * Initialize an audio resampler.
3250 * Note, if either rate is not an integer then simply scale both rates up so they are.
3251 * @param filter_length length of each FIR filter in the filterbank relative to the cutoff freq
3252 * @param log2_phase_count log2 of the number of entries in the polyphase filterbank
3253 * @param linear If 1 then the used FIR filter will be linearly interpolated
3254 between the 2 closest, if 0 the closest will be used
3255 * @param cutoff cutoff frequency, 1.0 corresponds to half the output sampling rate
3257 struct AVResampleContext *av_resample_init(int out_rate, int in_rate, int filter_length, int log2_phase_count, int linear, double cutoff);
3260 * Resample an array of samples using a previously configured context.
3261 * @param src an array of unconsumed samples
3262 * @param consumed the number of samples of src which have been consumed are returned here
3263 * @param src_size the number of unconsumed samples available
3264 * @param dst_size the amount of space in samples available in dst
3265 * @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.
3266 * @return the number of samples written in dst or -1 if an error occurred
3268 int av_resample(struct AVResampleContext *c, short *dst, short *src, int *consumed, int src_size, int dst_size, int update_ctx);
3272 * Compensate samplerate/timestamp drift. The compensation is done by changing
3273 * the resampler parameters, so no audible clicks or similar distortions occur
3274 * @param compensation_distance distance in output samples over which the compensation should be performed
3275 * @param sample_delta number of output samples which should be output less
3277 * example: av_resample_compensate(c, 10, 500)
3278 * here instead of 510 samples only 500 samples would be output
3280 * note, due to rounding the actual compensation might be slightly different,
3281 * especially if the compensation_distance is large and the in_rate used during init is small
3283 void av_resample_compensate(struct AVResampleContext *c, int sample_delta, int compensation_distance);
3284 void av_resample_close(struct AVResampleContext *c);
3287 * Allocate memory for a picture. Call avpicture_free() to free it.
3289 * @see avpicture_fill()
3291 * @param picture the picture to be filled in
3292 * @param pix_fmt the format of the picture
3293 * @param width the width of the picture
3294 * @param height the height of the picture
3295 * @return zero if successful, a negative value if not
3297 int avpicture_alloc(AVPicture *picture, enum PixelFormat pix_fmt, int width, int height);
3300 * Free a picture previously allocated by avpicture_alloc().
3301 * The data buffer used by the AVPicture is freed, but the AVPicture structure
3304 * @param picture the AVPicture to be freed
3306 void avpicture_free(AVPicture *picture);
3309 * Fill in the AVPicture fields.
3310 * The fields of the given AVPicture are filled in by using the 'ptr' address
3311 * which points to the image data buffer. Depending on the specified picture
3312 * format, one or multiple image data pointers and line sizes will be set.
3313 * If a planar format is specified, several pointers will be set pointing to
3314 * the different picture planes and the line sizes of the different planes
3315 * will be stored in the lines_sizes array.
3316 * Call with ptr == NULL to get the required size for the ptr buffer.
3318 * To allocate the buffer and fill in the AVPicture fields in one call,
3319 * use avpicture_alloc().
3321 * @param picture AVPicture whose fields are to be filled in
3322 * @param ptr Buffer which will contain or contains the actual image data
3323 * @param pix_fmt The format in which the picture data is stored.
3324 * @param width the width of the image in pixels
3325 * @param height the height of the image in pixels
3326 * @return size of the image data in bytes
3328 int avpicture_fill(AVPicture *picture, uint8_t *ptr,
3329 enum PixelFormat pix_fmt, int width, int height);
3332 * Copy pixel data from an AVPicture into a buffer.
3333 * The data is stored compactly, without any gaps for alignment or padding
3334 * which may be applied by avpicture_fill().
3336 * @see avpicture_get_size()
3338 * @param[in] src AVPicture containing image data
3339 * @param[in] pix_fmt The format in which the picture data is stored.
3340 * @param[in] width the width of the image in pixels.
3341 * @param[in] height the height of the image in pixels.
3342 * @param[out] dest A buffer into which picture data will be copied.
3343 * @param[in] dest_size The size of 'dest'.
3344 * @return The number of bytes written to dest, or a negative value (error code) on error.
3346 int avpicture_layout(const AVPicture* src, enum PixelFormat pix_fmt, int width, int height,
3347 unsigned char *dest, int dest_size);
3350 * Calculate the size in bytes that a picture of the given width and height
3351 * would occupy if stored in the given picture format.
3352 * Note that this returns the size of a compact representation as generated
3353 * by avpicture_layout(), which can be smaller than the size required for e.g.
3356 * @param pix_fmt the given picture format
3357 * @param width the width of the image
3358 * @param height the height of the image
3359 * @return Image data size in bytes or -1 on error (e.g. too large dimensions).
3361 int avpicture_get_size(enum PixelFormat pix_fmt, int width, int height);
3362 void avcodec_get_chroma_sub_sample(enum PixelFormat pix_fmt, int *h_shift, int *v_shift);
3365 * Get the name of a codec.
3366 * @return a static string identifying the codec; never NULL
3368 const char *avcodec_get_name(enum CodecID id);
3370 void avcodec_set_dimensions(AVCodecContext *s, int width, int height);
3373 * Return a value representing the fourCC code associated to the
3374 * pixel format pix_fmt, or 0 if no associated fourCC code can be
3377 unsigned int avcodec_pix_fmt_to_codec_tag(enum PixelFormat pix_fmt);
3380 * Put a string representing the codec tag codec_tag in buf.
3382 * @param buf_size size in bytes of buf
3383 * @return the length of the string that would have been generated if
3384 * enough space had been available, excluding the trailing null
3386 size_t av_get_codec_tag_string(char *buf, size_t buf_size, unsigned int codec_tag);
3388 #define FF_LOSS_RESOLUTION 0x0001 /**< loss due to resolution change */
3389 #define FF_LOSS_DEPTH 0x0002 /**< loss due to color depth change */
3390 #define FF_LOSS_COLORSPACE 0x0004 /**< loss due to color space conversion */
3391 #define FF_LOSS_ALPHA 0x0008 /**< loss of alpha bits */
3392 #define FF_LOSS_COLORQUANT 0x0010 /**< loss due to color quantization */
3393 #define FF_LOSS_CHROMA 0x0020 /**< loss of chroma (e.g. RGB to gray conversion) */
3396 * Compute what kind of losses will occur when converting from one specific
3397 * pixel format to another.
3398 * When converting from one pixel format to another, information loss may occur.
3399 * For example, when converting from RGB24 to GRAY, the color information will
3400 * be lost. Similarly, other losses occur when converting from some formats to
3401 * other formats. These losses can involve loss of chroma, but also loss of
3402 * resolution, loss of color depth, loss due to the color space conversion, loss
3403 * of the alpha bits or loss due to color quantization.
3404 * avcodec_get_fix_fmt_loss() informs you about the various types of losses
3405 * which will occur when converting from one pixel format to another.
3407 * @param[in] dst_pix_fmt destination pixel format
3408 * @param[in] src_pix_fmt source pixel format
3409 * @param[in] has_alpha Whether the source pixel format alpha channel is used.
3410 * @return Combination of flags informing you what kind of losses will occur
3411 * (maximum loss for an invalid dst_pix_fmt).
3413 int avcodec_get_pix_fmt_loss(enum PixelFormat dst_pix_fmt, enum PixelFormat src_pix_fmt,
3417 * Find the best pixel format to convert to given a certain source pixel
3418 * format. When converting from one pixel format to another, information loss
3419 * may occur. For example, when converting from RGB24 to GRAY, the color
3420 * information will be lost. Similarly, other losses occur when converting from
3421 * some formats to other formats. avcodec_find_best_pix_fmt() searches which of
3422 * the given pixel formats should be used to suffer the least amount of loss.
3423 * The pixel formats from which it chooses one, are determined by the
3424 * pix_fmt_mask parameter.
3426 * Note, only the first 64 pixel formats will fit in pix_fmt_mask.
3429 * src_pix_fmt = PIX_FMT_YUV420P;
3430 * pix_fmt_mask = (1 << PIX_FMT_YUV422P) | (1 << PIX_FMT_RGB24);
3431 * dst_pix_fmt = avcodec_find_best_pix_fmt(pix_fmt_mask, src_pix_fmt, alpha, &loss);
3434 * @param[in] pix_fmt_mask bitmask determining which pixel format to choose from
3435 * @param[in] src_pix_fmt source pixel format
3436 * @param[in] has_alpha Whether the source pixel format alpha channel is used.
3437 * @param[out] loss_ptr Combination of flags informing you what kind of losses will occur.
3438 * @return The best pixel format to convert to or -1 if none was found.
3440 enum PixelFormat avcodec_find_best_pix_fmt(int64_t pix_fmt_mask, enum PixelFormat src_pix_fmt,
3441 int has_alpha, int *loss_ptr);
3444 * Find the best pixel format to convert to given a certain source pixel
3445 * format and a selection of two destination pixel formats. When converting from
3446 * one pixel format to another, information loss may occur. For example, when converting
3447 * from RGB24 to GRAY, the color information will be lost. Similarly, other losses occur when
3448 * converting from some formats to other formats. avcodec_find_best_pix_fmt2() selects which of
3449 * the given pixel formats should be used to suffer the least amount of loss.
3451 * If one of the destination formats is PIX_FMT_NONE the other pixel format (if valid) will be
3455 * src_pix_fmt = PIX_FMT_YUV420P;
3456 * dst_pix_fmt1= PIX_FMT_RGB24;
3457 * dst_pix_fmt2= PIX_FMT_GRAY8;
3458 * dst_pix_fmt3= PIX_FMT_RGB8;
3459 * loss= FF_LOSS_CHROMA; // don't care about chroma loss, so chroma loss will be ignored.
3460 * dst_pix_fmt = avcodec_find_best_pix_fmt2(dst_pix_fmt1, dst_pix_fmt2, src_pix_fmt, alpha, &loss);
3461 * dst_pix_fmt = avcodec_find_best_pix_fmt2(dst_pix_fmt, dst_pix_fmt3, src_pix_fmt, alpha, &loss);
3464 * @param[in] dst_pix_fmt1 One of the two destination pixel formats to choose from
3465 * @param[in] dst_pix_fmt2 The other of the two destination pixel formats to choose from
3466 * @param[in] src_pix_fmt Source pixel format
3467 * @param[in] has_alpha Whether the source pixel format alpha channel is used.
3468 * @param[in, out] loss_ptr Combination of loss flags. In: selects which of the losses to ignore, i.e.
3469 * NULL or value of zero means we care about all losses. Out: the loss
3470 * that occurs when converting from src to selected dst pixel format.
3471 * @return The best pixel format to convert to or -1 if none was found.
3473 enum PixelFormat avcodec_find_best_pix_fmt2(enum PixelFormat dst_pix_fmt1, enum PixelFormat dst_pix_fmt2,
3474 enum PixelFormat src_pix_fmt, int has_alpha, int *loss_ptr);
3477 /* deinterlace a picture */
3478 /* deinterlace - if not supported return -1 */
3479 int avpicture_deinterlace(AVPicture *dst, const AVPicture *src,
3480 enum PixelFormat pix_fmt, int width, int height);
3482 /* external high level API */
3485 * If c is NULL, returns the first registered codec,
3486 * if c is non-NULL, returns the next registered codec after c,
3487 * or NULL if c is the last one.
3489 AVCodec *av_codec_next(AVCodec *c);
3492 * Return the LIBAVCODEC_VERSION_INT constant.
3494 unsigned avcodec_version(void);
3497 * Return the libavcodec build-time configuration.
3499 const char *avcodec_configuration(void);
3502 * Return the libavcodec license.
3504 const char *avcodec_license(void);
3507 * Register the codec codec and initialize libavcodec.
3509 * @warning either this function or avcodec_register_all() must be called
3510 * before any other libavcodec functions.
3512 * @see avcodec_register_all()
3514 void avcodec_register(AVCodec *codec);
3517 * Find a registered encoder with a matching codec ID.
3519 * @param id CodecID of the requested encoder
3520 * @return An encoder if one was found, NULL otherwise.
3522 AVCodec *avcodec_find_encoder(enum CodecID id);
3525 * Find a registered encoder with the specified name.
3527 * @param name name of the requested encoder
3528 * @return An encoder if one was found, NULL otherwise.
3530 AVCodec *avcodec_find_encoder_by_name(const char *name);
3533 * Find a registered decoder with a matching codec ID.
3535 * @param id CodecID of the requested decoder
3536 * @return A decoder if one was found, NULL otherwise.
3538 AVCodec *avcodec_find_decoder(enum CodecID id);
3541 * Find a registered decoder with the specified name.
3543 * @param name name of the requested decoder
3544 * @return A decoder if one was found, NULL otherwise.
3546 AVCodec *avcodec_find_decoder_by_name(const char *name);
3547 void avcodec_string(char *buf, int buf_size, AVCodecContext *enc, int encode);
3550 * Return a name for the specified profile, if available.
3552 * @param codec the codec that is searched for the given profile
3553 * @param profile the profile value for which a name is requested
3554 * @return A name for the profile if found, NULL otherwise.
3556 const char *av_get_profile_name(const AVCodec *codec, int profile);
3558 #if FF_API_ALLOC_CONTEXT
3560 * Set the fields of the given AVCodecContext to default values.
3562 * @param s The AVCodecContext of which the fields should be set to default values.
3563 * @deprecated use avcodec_get_context_defaults3
3565 attribute_deprecated
3566 void avcodec_get_context_defaults(AVCodecContext *s);
3568 /** THIS FUNCTION IS NOT YET PART OF THE PUBLIC API!
3569 * we WILL change its arguments and name a few times! */
3570 attribute_deprecated
3571 void avcodec_get_context_defaults2(AVCodecContext *s, enum AVMediaType);
3575 * Set the fields of the given AVCodecContext to default values corresponding
3576 * to the given codec (defaults may be codec-dependent).
3578 * Do not call this function if a non-NULL codec has been passed
3579 * to avcodec_alloc_context3() that allocated this AVCodecContext.
3580 * If codec is non-NULL, it is illegal to call avcodec_open2() with a
3581 * different codec on this AVCodecContext.
3583 int avcodec_get_context_defaults3(AVCodecContext *s, AVCodec *codec);
3585 #if FF_API_ALLOC_CONTEXT
3587 * Allocate an AVCodecContext and set its fields to default values. The
3588 * resulting struct can be deallocated by simply calling av_free().
3590 * @return An AVCodecContext filled with default values or NULL on failure.
3591 * @see avcodec_get_context_defaults
3593 * @deprecated use avcodec_alloc_context3()
3595 attribute_deprecated
3596 AVCodecContext *avcodec_alloc_context(void);
3598 /** THIS FUNCTION IS NOT YET PART OF THE PUBLIC API!
3599 * we WILL change its arguments and name a few times! */
3600 attribute_deprecated
3601 AVCodecContext *avcodec_alloc_context2(enum AVMediaType);
3605 * Allocate an AVCodecContext and set its fields to default values. The
3606 * resulting struct can be deallocated by calling avcodec_close() on it followed
3609 * @param codec if non-NULL, allocate private data and initialize defaults
3610 * for the given codec. It is illegal to then call avcodec_open2()
3611 * with a different codec.
3612 * If NULL, then the codec-specific defaults won't be initialized,
3613 * which may result in suboptimal default settings (this is
3614 * important mainly for encoders, e.g. libx264).
3616 * @return An AVCodecContext filled with default values or NULL on failure.
3617 * @see avcodec_get_context_defaults
3619 AVCodecContext *avcodec_alloc_context3(AVCodec *codec);
3622 * Copy the settings of the source AVCodecContext into the destination
3623 * AVCodecContext. The resulting destination codec context will be
3624 * unopened, i.e. you are required to call avcodec_open2() before you
3625 * can use this AVCodecContext to decode/encode video/audio data.
3627 * @param dest target codec context, should be initialized with
3628 * avcodec_alloc_context3(), but otherwise uninitialized
3629 * @param src source codec context
3630 * @return AVERROR() on error (e.g. memory allocation error), 0 on success
3632 int avcodec_copy_context(AVCodecContext *dest, const AVCodecContext *src);
3635 * Set the fields of the given AVFrame to default values.
3637 * @param pic The AVFrame of which the fields should be set to default values.
3639 void avcodec_get_frame_defaults(AVFrame *pic);
3642 * Allocate an AVFrame and set its fields to default values. The resulting
3643 * struct can be deallocated by simply calling av_free().
3645 * @return An AVFrame filled with default values or NULL on failure.
3646 * @see avcodec_get_frame_defaults
3648 AVFrame *avcodec_alloc_frame(void);
3650 int avcodec_default_get_buffer(AVCodecContext *s, AVFrame *pic);
3651 void avcodec_default_release_buffer(AVCodecContext *s, AVFrame *pic);
3652 int avcodec_default_reget_buffer(AVCodecContext *s, AVFrame *pic);
3655 * Return the amount of padding in pixels which the get_buffer callback must
3656 * provide around the edge of the image for codecs which do not have the
3657 * CODEC_FLAG_EMU_EDGE flag.
3659 * @return Required padding in pixels.
3661 unsigned avcodec_get_edge_width(void);
3663 * Modify width and height values so that they will result in a memory
3664 * buffer that is acceptable for the codec if you do not use any horizontal
3667 * May only be used if a codec with CODEC_CAP_DR1 has been opened.
3668 * If CODEC_FLAG_EMU_EDGE is not set, the dimensions must have been increased
3669 * according to avcodec_get_edge_width() before.
3671 void avcodec_align_dimensions(AVCodecContext *s, int *width, int *height);
3673 * Modify width and height values so that they will result in a memory
3674 * buffer that is acceptable for the codec if you also ensure that all
3675 * line sizes are a multiple of the respective linesize_align[i].
3677 * May only be used if a codec with CODEC_CAP_DR1 has been opened.
3678 * If CODEC_FLAG_EMU_EDGE is not set, the dimensions must have been increased
3679 * according to avcodec_get_edge_width() before.
3681 void avcodec_align_dimensions2(AVCodecContext *s, int *width, int *height,
3682 int linesize_align[AV_NUM_DATA_POINTERS]);
3684 enum PixelFormat avcodec_default_get_format(struct AVCodecContext *s, const enum PixelFormat * fmt);
3686 int avcodec_default_execute(AVCodecContext *c, int (*func)(AVCodecContext *c2, void *arg2),void *arg, int *ret, int count, int size);
3687 int avcodec_default_execute2(AVCodecContext *c, int (*func)(AVCodecContext *c2, void *arg2, int, int),void *arg, int *ret, int count);
3688 //FIXME func typedef
3690 #if FF_API_AVCODEC_OPEN
3692 * Initialize the AVCodecContext to use the given AVCodec. Prior to using this
3693 * function the context has to be allocated.
3695 * The functions avcodec_find_decoder_by_name(), avcodec_find_encoder_by_name(),
3696 * avcodec_find_decoder() and avcodec_find_encoder() provide an easy way for
3697 * retrieving a codec.
3699 * @warning This function is not thread safe!
3702 * avcodec_register_all();
3703 * codec = avcodec_find_decoder(CODEC_ID_H264);
3707 * context = avcodec_alloc_context3(codec);
3709 * if (avcodec_open(context, codec) < 0)
3713 * @param avctx The context which will be set up to use the given codec.
3714 * @param codec The codec to use within the context.
3715 * @return zero on success, a negative value on error
3716 * @see avcodec_alloc_context3, avcodec_find_decoder, avcodec_find_encoder, avcodec_close
3718 * @deprecated use avcodec_open2
3720 attribute_deprecated
3721 int avcodec_open(AVCodecContext *avctx, AVCodec *codec);
3725 * Initialize the AVCodecContext to use the given AVCodec. Prior to using this
3726 * function the context has to be allocated with avcodec_alloc_context3().
3728 * The functions avcodec_find_decoder_by_name(), avcodec_find_encoder_by_name(),
3729 * avcodec_find_decoder() and avcodec_find_encoder() provide an easy way for
3730 * retrieving a codec.
3732 * @warning This function is not thread safe!
3735 * avcodec_register_all();
3736 * av_dict_set(&opts, "b", "2.5M", 0);
3737 * codec = avcodec_find_decoder(CODEC_ID_H264);
3741 * context = avcodec_alloc_context3(codec);
3743 * if (avcodec_open2(context, codec, opts) < 0)
3747 * @param avctx The context to initialize.
3748 * @param codec The codec to open this context for. If a non-NULL codec has been
3749 * previously passed to avcodec_alloc_context3() or
3750 * avcodec_get_context_defaults3() for this context, then this
3751 * parameter MUST be either NULL or equal to the previously passed
3753 * @param options A dictionary filled with AVCodecContext and codec-private options.
3754 * On return this object will be filled with options that were not found.
3756 * @return zero on success, a negative value on error
3757 * @see avcodec_alloc_context3(), avcodec_find_decoder(), avcodec_find_encoder(),
3758 * av_dict_set(), av_opt_find().
3760 int avcodec_open2(AVCodecContext *avctx, AVCodec *codec, AVDictionary **options);
3762 #if FF_API_OLD_DECODE_AUDIO
3764 * Wrapper function which calls avcodec_decode_audio4.
3766 * @deprecated Use avcodec_decode_audio4 instead.
3768 * Decode the audio frame of size avpkt->size from avpkt->data into samples.
3769 * Some decoders may support multiple frames in a single AVPacket, such
3770 * decoders would then just decode the first frame. In this case,
3771 * avcodec_decode_audio3 has to be called again with an AVPacket that contains
3772 * the remaining data in order to decode the second frame etc.
3774 * could be outputted, frame_size_ptr is zero. Otherwise, it is the
3775 * decompressed frame size in bytes.
3777 * @warning You must set frame_size_ptr to the allocated size of the
3778 * output buffer before calling avcodec_decode_audio3().
3780 * @warning The input buffer must be FF_INPUT_BUFFER_PADDING_SIZE larger than
3781 * the actual read bytes because some optimized bitstream readers read 32 or 64
3782 * bits at once and could read over the end.
3784 * @warning The end of the input buffer avpkt->data should be set to 0 to ensure that
3785 * no overreading happens for damaged MPEG streams.
3787 * @warning You must not provide a custom get_buffer() when using
3788 * avcodec_decode_audio3(). Doing so will override it with
3789 * avcodec_default_get_buffer. Use avcodec_decode_audio4() instead,
3790 * which does allow the application to provide a custom get_buffer().
3792 * @note You might have to align the input buffer avpkt->data and output buffer
3793 * samples. The alignment requirements depend on the CPU: On some CPUs it isn't
3794 * necessary at all, on others it won't work at all if not aligned and on others
3795 * it will work but it will have an impact on performance.
3797 * In practice, avpkt->data should have 4 byte alignment at minimum and
3798 * samples should be 16 byte aligned unless the CPU doesn't need it
3799 * (AltiVec and SSE do).
3801 * @note Codecs which have the CODEC_CAP_DELAY capability set have a delay
3802 * between input and output, these need to be fed with avpkt->data=NULL,
3803 * avpkt->size=0 at the end to return the remaining frames.
3805 * @param avctx the codec context
3806 * @param[out] samples the output buffer, sample type in avctx->sample_fmt
3807 * If the sample format is planar, each channel plane will
3808 * be the same size, with no padding between channels.
3809 * @param[in,out] frame_size_ptr the output buffer size in bytes
3810 * @param[in] avpkt The input AVPacket containing the input buffer.
3811 * You can create such packet with av_init_packet() and by then setting
3812 * data and size, some decoders might in addition need other fields.
3813 * All decoders are designed to use the least fields possible though.
3814 * @return On error a negative value is returned, otherwise the number of bytes
3815 * used or zero if no frame data was decompressed (used) from the input AVPacket.
3817 attribute_deprecated int avcodec_decode_audio3(AVCodecContext *avctx, int16_t *samples,
3818 int *frame_size_ptr,
3823 * Decode the audio frame of size avpkt->size from avpkt->data into frame.
3825 * Some decoders may support multiple frames in a single AVPacket. Such
3826 * decoders would then just decode the first frame. In this case,
3827 * avcodec_decode_audio4 has to be called again with an AVPacket containing
3828 * the remaining data in order to decode the second frame, etc...
3829 * Even if no frames are returned, the packet needs to be fed to the decoder
3830 * with remaining data until it is completely consumed or an error occurs.
3832 * @warning The input buffer, avpkt->data must be FF_INPUT_BUFFER_PADDING_SIZE
3833 * larger than the actual read bytes because some optimized bitstream
3834 * readers read 32 or 64 bits at once and could read over the end.
3836 * @note You might have to align the input buffer. The alignment requirements
3837 * depend on the CPU and the decoder.
3839 * @param avctx the codec context
3840 * @param[out] frame The AVFrame in which to store decoded audio samples.
3841 * Decoders request a buffer of a particular size by setting
3842 * AVFrame.nb_samples prior to calling get_buffer(). The
3843 * decoder may, however, only utilize part of the buffer by
3844 * setting AVFrame.nb_samples to a smaller value in the
3846 * @param[out] got_frame_ptr Zero if no frame could be decoded, otherwise it is
3848 * @param[in] avpkt The input AVPacket containing the input buffer.
3849 * At least avpkt->data and avpkt->size should be set. Some
3850 * decoders might also require additional fields to be set.
3851 * @return A negative error code is returned if an error occurred during
3852 * decoding, otherwise the number of bytes consumed from the input
3853 * AVPacket is returned.
3855 int avcodec_decode_audio4(AVCodecContext *avctx, AVFrame *frame,
3856 int *got_frame_ptr, AVPacket *avpkt);
3859 * Decode the video frame of size avpkt->size from avpkt->data into picture.
3860 * Some decoders may support multiple frames in a single AVPacket, such
3861 * decoders would then just decode the first frame.
3863 * @warning The input buffer must be FF_INPUT_BUFFER_PADDING_SIZE larger than
3864 * the actual read bytes because some optimized bitstream readers read 32 or 64
3865 * bits at once and could read over the end.
3867 * @warning The end of the input buffer buf should be set to 0 to ensure that
3868 * no overreading happens for damaged MPEG streams.
3870 * @note You might have to align the input buffer avpkt->data.
3871 * The alignment requirements depend on the CPU: on some CPUs it isn't
3872 * necessary at all, on others it won't work at all if not aligned and on others
3873 * it will work but it will have an impact on performance.
3875 * In practice, avpkt->data should have 4 byte alignment at minimum.
3877 * @note Codecs which have the CODEC_CAP_DELAY capability set have a delay
3878 * between input and output, these need to be fed with avpkt->data=NULL,
3879 * avpkt->size=0 at the end to return the remaining frames.
3881 * @param avctx the codec context
3882 * @param[out] picture The AVFrame in which the decoded video frame will be stored.
3883 * Use avcodec_alloc_frame to get an AVFrame, the codec will
3884 * allocate memory for the actual bitmap.
3885 * with default get/release_buffer(), the decoder frees/reuses the bitmap as it sees fit.
3886 * with overridden get/release_buffer() (needs CODEC_CAP_DR1) the user decides into what buffer the decoder
3887 * decodes and the decoder tells the user once it does not need the data anymore,
3888 * the user app can at this point free/reuse/keep the memory as it sees fit.
3890 * @param[in] avpkt The input AVpacket containing the input buffer.
3891 * You can create such packet with av_init_packet() and by then setting
3892 * data and size, some decoders might in addition need other fields like
3893 * flags&AV_PKT_FLAG_KEY. All decoders are designed to use the least
3895 * @param[in,out] got_picture_ptr Zero if no frame could be decompressed, otherwise, it is nonzero.
3896 * @return On error a negative value is returned, otherwise the number of bytes
3897 * used or zero if no frame could be decompressed.
3899 int avcodec_decode_video2(AVCodecContext *avctx, AVFrame *picture,
3900 int *got_picture_ptr,
3901 const AVPacket *avpkt);
3904 * Decode a subtitle message.
3905 * Return a negative value on error, otherwise return the number of bytes used.
3906 * If no subtitle could be decompressed, got_sub_ptr is zero.
3907 * Otherwise, the subtitle is stored in *sub.
3908 * Note that CODEC_CAP_DR1 is not available for subtitle codecs. This is for
3909 * simplicity, because the performance difference is expect to be negligible
3910 * and reusing a get_buffer written for video codecs would probably perform badly
3911 * due to a potentially very different allocation pattern.
3913 * @param avctx the codec context
3914 * @param[out] sub The AVSubtitle in which the decoded subtitle will be stored, must be
3915 freed with avsubtitle_free if *got_sub_ptr is set.
3916 * @param[in,out] got_sub_ptr Zero if no subtitle could be decompressed, otherwise, it is nonzero.
3917 * @param[in] avpkt The input AVPacket containing the input buffer.
3919 int avcodec_decode_subtitle2(AVCodecContext *avctx, AVSubtitle *sub,
3924 * Free all allocated data in the given subtitle struct.
3926 * @param sub AVSubtitle to free.
3928 void avsubtitle_free(AVSubtitle *sub);
3930 #if FF_API_OLD_ENCODE_AUDIO
3932 * Encode an audio frame from samples into buf.
3934 * @deprecated Use avcodec_encode_audio2 instead.
3936 * @note The output buffer should be at least FF_MIN_BUFFER_SIZE bytes large.
3937 * However, for codecs with avctx->frame_size equal to 0 (e.g. PCM) the user
3938 * will know how much space is needed because it depends on the value passed
3939 * in buf_size as described below. In that case a lower value can be used.
3941 * @param avctx the codec context
3942 * @param[out] buf the output buffer
3943 * @param[in] buf_size the output buffer size
3944 * @param[in] samples the input buffer containing the samples
3945 * The number of samples read from this buffer is frame_size*channels,
3946 * both of which are defined in avctx.
3947 * For codecs which have avctx->frame_size equal to 0 (e.g. PCM) the number of
3948 * samples read from samples is equal to:
3949 * buf_size * 8 / (avctx->channels * av_get_bits_per_sample(avctx->codec_id))
3950 * This also implies that av_get_bits_per_sample() must not return 0 for these
3952 * @return On error a negative value is returned, on success zero or the number
3953 * of bytes used to encode the data read from the input buffer.
3955 int attribute_deprecated avcodec_encode_audio(AVCodecContext *avctx,
3956 uint8_t *buf, int buf_size,
3957 const short *samples);
3961 * Encode a frame of audio.
3963 * Takes input samples from frame and writes the next output packet, if
3964 * available, to avpkt. The output packet does not necessarily contain data for
3965 * the most recent frame, as encoders can delay, split, and combine input frames
3966 * internally as needed.
3968 * @param avctx codec context
3969 * @param avpkt output AVPacket.
3970 * The user can supply an output buffer by setting
3971 * avpkt->data and avpkt->size prior to calling the
3972 * function, but if the size of the user-provided data is not
3973 * large enough, encoding will fail. All other AVPacket fields
3974 * will be reset by the encoder using av_init_packet(). If
3975 * avpkt->data is NULL, the encoder will allocate it.
3976 * The encoder will set avpkt->size to the size of the
3979 * If this function fails or produces no output, avpkt will be
3980 * freed using av_free_packet() (i.e. avpkt->destruct will be
3981 * called to free the user supplied buffer).
3982 * @param[in] frame AVFrame containing the raw audio data to be encoded.
3983 * May be NULL when flushing an encoder that has the
3984 * CODEC_CAP_DELAY capability set.
3985 * There are 2 codec capabilities that affect the allowed
3986 * values of frame->nb_samples.
3987 * If CODEC_CAP_SMALL_LAST_FRAME is set, then only the final
3988 * frame may be smaller than avctx->frame_size, and all other
3989 * frames must be equal to avctx->frame_size.
3990 * If CODEC_CAP_VARIABLE_FRAME_SIZE is set, then each frame
3991 * can have any number of samples.
3992 * If neither is set, frame->nb_samples must be equal to
3993 * avctx->frame_size for all frames.
3994 * @param[out] got_packet_ptr This field is set to 1 by libavcodec if the
3995 * output packet is non-empty, and to 0 if it is
3996 * empty. If the function returns an error, the
3997 * packet can be assumed to be invalid, and the
3998 * value of got_packet_ptr is undefined and should
4000 * @return 0 on success, negative error code on failure
4002 int avcodec_encode_audio2(AVCodecContext *avctx, AVPacket *avpkt,
4003 const AVFrame *frame, int *got_packet_ptr);
4006 * Fill audio frame data and linesize.
4007 * AVFrame extended_data channel pointers are allocated if necessary for
4010 * @param frame the AVFrame
4011 * frame->nb_samples must be set prior to calling the
4012 * function. This function fills in frame->data,
4013 * frame->extended_data, frame->linesize[0].
4014 * @param nb_channels channel count
4015 * @param sample_fmt sample format
4016 * @param buf buffer to use for frame data
4017 * @param buf_size size of buffer
4018 * @param align plane size sample alignment
4019 * @return 0 on success, negative error code on failure
4021 int avcodec_fill_audio_frame(AVFrame *frame, int nb_channels,
4022 enum AVSampleFormat sample_fmt, const uint8_t *buf,
4023 int buf_size, int align);
4025 #if FF_API_OLD_ENCODE_VIDEO
4027 * @deprecated use avcodec_encode_video2() instead.
4029 * Encode a video frame from pict into buf.
4030 * The input picture should be
4031 * stored using a specific format, namely avctx.pix_fmt.
4033 * @param avctx the codec context
4034 * @param[out] buf the output buffer for the bitstream of encoded frame
4035 * @param[in] buf_size the size of the output buffer in bytes
4036 * @param[in] pict the input picture to encode
4037 * @return On error a negative value is returned, on success zero or the number
4038 * of bytes used from the output buffer.
4040 attribute_deprecated
4041 int avcodec_encode_video(AVCodecContext *avctx, uint8_t *buf, int buf_size,
4042 const AVFrame *pict);
4046 * Encode a frame of video.
4048 * Takes input raw video data from frame and writes the next output packet, if
4049 * available, to avpkt. The output packet does not necessarily contain data for
4050 * the most recent frame, as encoders can delay and reorder input frames
4051 * internally as needed.
4053 * @param avctx codec context
4054 * @param avpkt output AVPacket.
4055 * The user can supply an output buffer by setting
4056 * avpkt->data and avpkt->size prior to calling the
4057 * function, but if the size of the user-provided data is not
4058 * large enough, encoding will fail. All other AVPacket fields
4059 * will be reset by the encoder using av_init_packet(). If
4060 * avpkt->data is NULL, the encoder will allocate it.
4061 * The encoder will set avpkt->size to the size of the
4062 * output packet. The returned data (if any) belongs to the
4063 * caller, he is responsible for freeing it.
4065 * If this function fails or produces no output, avpkt will be
4066 * freed using av_free_packet() (i.e. avpkt->destruct will be
4067 * called to free the user supplied buffer).
4068 * @param[in] frame AVFrame containing the raw video data to be encoded.
4069 * May be NULL when flushing an encoder that has the
4070 * CODEC_CAP_DELAY capability set.
4071 * @param[out] got_packet_ptr This field is set to 1 by libavcodec if the
4072 * output packet is non-empty, and to 0 if it is
4073 * empty. If the function returns an error, the
4074 * packet can be assumed to be invalid, and the
4075 * value of got_packet_ptr is undefined and should
4077 * @return 0 on success, negative error code on failure
4079 int avcodec_encode_video2(AVCodecContext *avctx, AVPacket *avpkt,
4080 const AVFrame *frame, int *got_packet_ptr);
4082 int avcodec_encode_subtitle(AVCodecContext *avctx, uint8_t *buf, int buf_size,
4083 const AVSubtitle *sub);
4086 * Close a given AVCodecContext and free all the data associated with it
4087 * (but not the AVCodecContext itself).
4089 * Calling this function on an AVCodecContext that hasn't been opened will free
4090 * the codec-specific data allocated in avcodec_alloc_context3() /
4091 * avcodec_get_context_defaults3() with a non-NULL codec. Subsequent calls will
4094 int avcodec_close(AVCodecContext *avctx);
4097 * Register all the codecs, parsers and bitstream filters which were enabled at
4098 * configuration time. If you do not call this function you can select exactly
4099 * which formats you want to support, by using the individual registration
4102 * @see avcodec_register
4103 * @see av_register_codec_parser
4104 * @see av_register_bitstream_filter
4106 void avcodec_register_all(void);
4109 * Flush buffers, should be called when seeking or when switching to a different stream.
4111 void avcodec_flush_buffers(AVCodecContext *avctx);
4113 void avcodec_default_free_buffers(AVCodecContext *s);
4115 /* misc useful functions */
4118 * Return codec bits per sample.
4120 * @param[in] codec_id the codec
4121 * @return Number of bits per sample or zero if unknown for the given codec.
4123 int av_get_bits_per_sample(enum CodecID codec_id);
4126 * Return the PCM codec associated with a sample format.
4127 * @param be endianness, 0 for little, 1 for big,
4128 * -1 (or anything else) for native
4129 * @return CODEC_ID_PCM_* or CODEC_ID_NONE
4131 enum CodecID av_get_pcm_codec(enum AVSampleFormat fmt, int be);
4134 * Return codec bits per sample.
4135 * Only return non-zero if the bits per sample is exactly correct, not an
4138 * @param[in] codec_id the codec
4139 * @return Number of bits per sample or zero if unknown for the given codec.
4141 int av_get_exact_bits_per_sample(enum CodecID codec_id);
4144 * Return audio frame duration.
4146 * @param avctx codec context
4147 * @param frame_bytes size of the frame, or 0 if unknown
4148 * @return frame duration, in samples, if known. 0 if not able to
4151 int av_get_audio_frame_duration(AVCodecContext *avctx, int frame_bytes);
4154 typedef struct AVCodecParserContext {
4156 struct AVCodecParser *parser;
4157 int64_t frame_offset; /* offset of the current frame */
4158 int64_t cur_offset; /* current offset
4159 (incremented by each av_parser_parse()) */
4160 int64_t next_frame_offset; /* offset of the next frame */
4162 int pict_type; /* XXX: Put it back in AVCodecContext. */
4164 * This field is used for proper frame duration computation in lavf.
4165 * It signals, how much longer the frame duration of the current frame
4166 * is compared to normal frame duration.
4168 * frame_duration = (1 + repeat_pict) * time_base
4170 * It is used by codecs like H.264 to display telecined material.
4172 int repeat_pict; /* XXX: Put it back in AVCodecContext. */
4173 int64_t pts; /* pts of the current frame */
4174 int64_t dts; /* dts of the current frame */
4179 int fetch_timestamp;
4181 #define AV_PARSER_PTS_NB 4
4182 int cur_frame_start_index;
4183 int64_t cur_frame_offset[AV_PARSER_PTS_NB];
4184 int64_t cur_frame_pts[AV_PARSER_PTS_NB];
4185 int64_t cur_frame_dts[AV_PARSER_PTS_NB];
4188 #define PARSER_FLAG_COMPLETE_FRAMES 0x0001
4189 #define PARSER_FLAG_ONCE 0x0002
4190 /// Set if the parser has a valid file offset
4191 #define PARSER_FLAG_FETCHED_OFFSET 0x0004
4193 int64_t offset; ///< byte offset from starting packet start
4194 int64_t cur_frame_end[AV_PARSER_PTS_NB];
4197 * Set by parser to 1 for key frames and 0 for non-key frames.
4198 * It is initialized to -1, so if the parser doesn't set this flag,
4199 * old-style fallback using AV_PICTURE_TYPE_I picture type as key frames
4205 * Time difference in stream time base units from the pts of this
4206 * packet to the point at which the output from the decoder has converged
4207 * independent from the availability of previous frames. That is, the
4208 * frames are virtually identical no matter if decoding started from
4209 * the very first frame or from this keyframe.
4210 * Is AV_NOPTS_VALUE if unknown.
4211 * This field is not the display duration of the current frame.
4212 * This field has no meaning if the packet does not have AV_PKT_FLAG_KEY
4215 * The purpose of this field is to allow seeking in streams that have no
4216 * keyframes in the conventional sense. It corresponds to the
4217 * recovery point SEI in H.264 and match_time_delta in NUT. It is also
4218 * essential for some types of subtitle streams to ensure that all
4219 * subtitles are correctly displayed after seeking.
4221 int64_t convergence_duration;
4223 // Timestamp generation support:
4225 * Synchronization point for start of timestamp generation.
4227 * Set to >0 for sync point, 0 for no sync point and <0 for undefined
4230 * For example, this corresponds to presence of H.264 buffering period
4236 * Offset of the current timestamp against last timestamp sync point in
4237 * units of AVCodecContext.time_base.
4239 * Set to INT_MIN when dts_sync_point unused. Otherwise, it must
4240 * contain a valid timestamp offset.
4242 * Note that the timestamp of sync point has usually a nonzero
4243 * dts_ref_dts_delta, which refers to the previous sync point. Offset of
4244 * the next frame after timestamp sync point will be usually 1.
4246 * For example, this corresponds to H.264 cpb_removal_delay.
4248 int dts_ref_dts_delta;
4251 * Presentation delay of current frame in units of AVCodecContext.time_base.
4253 * Set to INT_MIN when dts_sync_point unused. Otherwise, it must
4254 * contain valid non-negative timestamp delta (presentation time of a frame
4255 * must not lie in the past).
4257 * This delay represents the difference between decoding and presentation
4258 * time of the frame.
4260 * For example, this corresponds to H.264 dpb_output_delay.
4265 * Position of the packet in file.
4267 * Analogous to cur_frame_pts/dts
4269 int64_t cur_frame_pos[AV_PARSER_PTS_NB];
4272 * Byte position of currently parsed frame in stream.
4277 * Previous frame byte position.
4282 * Duration of the current frame.
4283 * For audio, this is in units of 1 / AVCodecContext.sample_rate.
4284 * For all other types, this is in units of AVCodecContext.time_base.
4287 } AVCodecParserContext;
4289 typedef struct AVCodecParser {
4290 int codec_ids[5]; /* several codec IDs are permitted */
4292 int (*parser_init)(AVCodecParserContext *s);
4293 int (*parser_parse)(AVCodecParserContext *s,
4294 AVCodecContext *avctx,
4295 const uint8_t **poutbuf, int *poutbuf_size,
4296 const uint8_t *buf, int buf_size);
4297 void (*parser_close)(AVCodecParserContext *s);
4298 int (*split)(AVCodecContext *avctx, const uint8_t *buf, int buf_size);
4299 struct AVCodecParser *next;
4302 AVCodecParser *av_parser_next(AVCodecParser *c);
4304 void av_register_codec_parser(AVCodecParser *parser);
4305 AVCodecParserContext *av_parser_init(int codec_id);
4310 * @param s parser context.
4311 * @param avctx codec context.
4312 * @param poutbuf set to pointer to parsed buffer or NULL if not yet finished.
4313 * @param poutbuf_size set to size of parsed buffer or zero if not yet finished.
4314 * @param buf input buffer.
4315 * @param buf_size input length, to signal EOF, this should be 0 (so that the last frame can be output).
4316 * @param pts input presentation timestamp.
4317 * @param dts input decoding timestamp.
4318 * @param pos input byte position in stream.
4319 * @return the number of bytes of the input bitstream used.
4324 * len = av_parser_parse2(myparser, AVCodecContext, &data, &size,
4331 * decode_frame(data, size);
4335 int av_parser_parse2(AVCodecParserContext *s,
4336 AVCodecContext *avctx,
4337 uint8_t **poutbuf, int *poutbuf_size,
4338 const uint8_t *buf, int buf_size,
4339 int64_t pts, int64_t dts,
4342 int av_parser_change(AVCodecParserContext *s,
4343 AVCodecContext *avctx,
4344 uint8_t **poutbuf, int *poutbuf_size,
4345 const uint8_t *buf, int buf_size, int keyframe);
4346 void av_parser_close(AVCodecParserContext *s);
4349 typedef struct AVBitStreamFilterContext {
4351 struct AVBitStreamFilter *filter;
4352 AVCodecParserContext *parser;
4353 struct AVBitStreamFilterContext *next;
4354 } AVBitStreamFilterContext;
4357 typedef struct AVBitStreamFilter {
4360 int (*filter)(AVBitStreamFilterContext *bsfc,
4361 AVCodecContext *avctx, const char *args,
4362 uint8_t **poutbuf, int *poutbuf_size,
4363 const uint8_t *buf, int buf_size, int keyframe);
4364 void (*close)(AVBitStreamFilterContext *bsfc);
4365 struct AVBitStreamFilter *next;
4366 } AVBitStreamFilter;
4368 void av_register_bitstream_filter(AVBitStreamFilter *bsf);
4369 AVBitStreamFilterContext *av_bitstream_filter_init(const char *name);
4370 int av_bitstream_filter_filter(AVBitStreamFilterContext *bsfc,
4371 AVCodecContext *avctx, const char *args,
4372 uint8_t **poutbuf, int *poutbuf_size,
4373 const uint8_t *buf, int buf_size, int keyframe);
4374 void av_bitstream_filter_close(AVBitStreamFilterContext *bsf);
4376 AVBitStreamFilter *av_bitstream_filter_next(AVBitStreamFilter *f);
4381 * Reallocate the given block if it is not large enough, otherwise do nothing.
4385 void *av_fast_realloc(void *ptr, unsigned int *size, size_t min_size);
4388 * Allocate a buffer, reusing the given one if large enough.
4390 * Contrary to av_fast_realloc the current buffer contents might not be
4391 * preserved and on error the old buffer is freed, thus no special
4392 * handling to avoid memleaks is necessary.
4394 * @param ptr pointer to pointer to already allocated buffer, overwritten with pointer to new buffer
4395 * @param size size of the buffer *ptr points to
4396 * @param min_size minimum size of *ptr buffer after returning, *ptr will be NULL and
4397 * *size 0 if an error occurred.
4399 void av_fast_malloc(void *ptr, unsigned int *size, size_t min_size);
4402 * Same behaviour av_fast_malloc but the buffer has additional
4403 * FF_INPUT_PADDING_SIZE at the end which will will always be 0.
4405 * In addition the whole buffer will initially and after resizes
4406 * be 0-initialized so that no uninitialized data will ever appear.
4408 void av_fast_padded_malloc(void *ptr, unsigned int *size, size_t min_size);
4411 * Copy image src to dst. Wraps av_picture_data_copy() above.
4413 void av_picture_copy(AVPicture *dst, const AVPicture *src,
4414 enum PixelFormat pix_fmt, int width, int height);
4417 * Crop image top and left side.
4419 int av_picture_crop(AVPicture *dst, const AVPicture *src,
4420 enum PixelFormat pix_fmt, int top_band, int left_band);
4425 int av_picture_pad(AVPicture *dst, const AVPicture *src, int height, int width, enum PixelFormat pix_fmt,
4426 int padtop, int padbottom, int padleft, int padright, int *color);
4429 * Encode extradata length to a buffer. Used by xiph codecs.
4431 * @param s buffer to write to; must be at least (v/255+1) bytes long
4432 * @param v size of extradata in bytes
4433 * @return number of bytes written to the buffer.
4435 unsigned int av_xiphlacing(unsigned char *s, unsigned int v);
4438 * Log a generic warning message about a missing feature. This function is
4439 * intended to be used internally by FFmpeg (libavcodec, libavformat, etc.)
4440 * only, and would normally not be used by applications.
4441 * @param[in] avc a pointer to an arbitrary struct of which the first field is
4442 * a pointer to an AVClass struct
4443 * @param[in] feature string containing the name of the missing feature
4444 * @param[in] want_sample indicates if samples are wanted which exhibit this feature.
4445 * If want_sample is non-zero, additional verbage will be added to the log
4446 * message which tells the user how to report samples to the development
4449 void av_log_missing_feature(void *avc, const char *feature, int want_sample);
4452 * Log a generic warning message asking for a sample. This function is
4453 * intended to be used internally by FFmpeg (libavcodec, libavformat, etc.)
4454 * only, and would normally not be used by applications.
4455 * @param[in] avc a pointer to an arbitrary struct of which the first field is
4456 * a pointer to an AVClass struct
4457 * @param[in] msg string containing an optional message, or NULL if no message
4459 void av_log_ask_for_sample(void *avc, const char *msg, ...) av_printf_format(2, 3);
4462 * Register the hardware accelerator hwaccel.
4464 void av_register_hwaccel(AVHWAccel *hwaccel);
4467 * If hwaccel is NULL, returns the first registered hardware accelerator,
4468 * if hwaccel is non-NULL, returns the next registered hardware accelerator
4469 * after hwaccel, or NULL if hwaccel is the last one.
4471 AVHWAccel *av_hwaccel_next(AVHWAccel *hwaccel);
4475 * Lock operation used by lockmgr
4478 AV_LOCK_CREATE, ///< Create a mutex
4479 AV_LOCK_OBTAIN, ///< Lock the mutex
4480 AV_LOCK_RELEASE, ///< Unlock the mutex
4481 AV_LOCK_DESTROY, ///< Free mutex resources
4485 * Register a user provided lock manager supporting the operations
4486 * specified by AVLockOp. mutex points to a (void *) where the
4487 * lockmgr should store/get a pointer to a user allocated mutex. It's
4488 * NULL upon AV_LOCK_CREATE and != NULL for all other ops.
4490 * @param cb User defined callback. Note: FFmpeg may invoke calls to this
4491 * callback during the call to av_lockmgr_register().
4492 * Thus, the application must be prepared to handle that.
4493 * If cb is set to NULL the lockmgr will be unregistered.
4494 * Also note that during unregistration the previously registered
4495 * lockmgr callback may also be invoked.
4497 int av_lockmgr_register(int (*cb)(void **mutex, enum AVLockOp op));
4500 * Get the type of the given codec.
4502 enum AVMediaType avcodec_get_type(enum CodecID codec_id);
4505 * Get the AVClass for AVCodecContext. It can be used in combination with
4506 * AV_OPT_SEARCH_FAKE_OBJ for examining options.
4508 * @see av_opt_find().
4510 const AVClass *avcodec_get_class(void);
4513 * Get the AVClass for AVFrame. It can be used in combination with
4514 * AV_OPT_SEARCH_FAKE_OBJ for examining options.
4516 * @see av_opt_find().
4518 const AVClass *avcodec_get_frame_class(void);
4521 * @return a positive value if s is open (i.e. avcodec_open2() was called on it
4522 * with no corresponding avcodec_close()), 0 otherwise.
4524 int avcodec_is_open(AVCodecContext *s);
4527 * @return a non-zero number if codec is an encoder, zero otherwise
4529 int av_codec_is_encoder(AVCodec *codec);
4532 * @return a non-zero number if codec is a decoder, zero otherwise
4534 int av_codec_is_decoder(AVCodec *codec);
4536 #endif /* AVCODEC_AVCODEC_H */