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 independantly 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,
250 CODEC_ID_Y41P = MKBETAG('Y','4','1','P'),
251 CODEC_ID_ESCAPE130 = MKBETAG('E','1','3','0'),
252 CODEC_ID_AVRP = MKBETAG('A','V','R','P'),
254 CODEC_ID_G2M = MKBETAG( 0 ,'G','2','M'),
255 CODEC_ID_AYUV = MKBETAG('A','Y','U','V'),
256 CODEC_ID_V308 = MKBETAG('V','3','0','8'),
257 CODEC_ID_V408 = MKBETAG('V','4','0','8'),
258 CODEC_ID_YUV4 = MKBETAG('Y','U','V','4'),
260 /* various PCM "codecs" */
261 CODEC_ID_FIRST_AUDIO = 0x10000, ///< A dummy id pointing at the start of audio codecs
262 CODEC_ID_PCM_S16LE = 0x10000,
278 CODEC_ID_PCM_S24DAUD,
280 CODEC_ID_PCM_S16LE_PLANAR,
289 CODEC_ID_PCM_S8_PLANAR,
291 /* various ADPCM codecs */
292 CODEC_ID_ADPCM_IMA_QT = 0x11000,
293 CODEC_ID_ADPCM_IMA_WAV,
294 CODEC_ID_ADPCM_IMA_DK3,
295 CODEC_ID_ADPCM_IMA_DK4,
296 CODEC_ID_ADPCM_IMA_WS,
297 CODEC_ID_ADPCM_IMA_SMJPEG,
306 CODEC_ID_ADPCM_YAMAHA,
307 CODEC_ID_ADPCM_SBPRO_4,
308 CODEC_ID_ADPCM_SBPRO_3,
309 CODEC_ID_ADPCM_SBPRO_2,
311 CODEC_ID_ADPCM_IMA_AMV,
312 CODEC_ID_ADPCM_EA_R1,
313 CODEC_ID_ADPCM_EA_R3,
314 CODEC_ID_ADPCM_EA_R2,
315 CODEC_ID_ADPCM_IMA_EA_SEAD,
316 CODEC_ID_ADPCM_IMA_EA_EACS,
317 CODEC_ID_ADPCM_EA_XAS,
318 CODEC_ID_ADPCM_EA_MAXIS_XA,
319 CODEC_ID_ADPCM_IMA_ISS,
321 CODEC_ID_ADPCM_IMA_APC,
324 CODEC_ID_AMR_NB = 0x12000,
327 /* RealAudio codecs*/
328 CODEC_ID_RA_144 = 0x13000,
331 /* various DPCM codecs */
332 CODEC_ID_ROQ_DPCM = 0x14000,
333 CODEC_ID_INTERPLAY_DPCM,
338 CODEC_ID_MP2 = 0x15000,
339 CODEC_ID_MP3, ///< preferred ID for decoding MPEG audio layer 1, 2 or 3
355 CODEC_ID_WESTWOOD_SND1,
356 CODEC_ID_GSM, ///< as in Berlin toast format
364 CODEC_ID_DSICINAUDIO,
368 CODEC_ID_GSM_MS, /* as found in WAV */
377 CODEC_ID_WMALOSSLESS,
386 CODEC_ID_BINKAUDIO_RDFT,
387 CODEC_ID_BINKAUDIO_DCT,
396 CODEC_ID_FFWAVESYNTH = MKBETAG('F','F','W','S'),
397 CODEC_ID_8SVX_RAW = MKBETAG('8','S','V','X'),
398 CODEC_ID_SONIC = MKBETAG('S','O','N','C'),
399 CODEC_ID_SONIC_LS = MKBETAG('S','O','N','L'),
401 /* subtitle codecs */
402 CODEC_ID_FIRST_SUBTITLE = 0x17000, ///< A dummy ID pointing at the start of subtitle codecs.
403 CODEC_ID_DVD_SUBTITLE = 0x17000,
404 CODEC_ID_DVB_SUBTITLE,
405 CODEC_ID_TEXT, ///< raw UTF-8 text
409 CODEC_ID_HDMV_PGS_SUBTITLE,
410 CODEC_ID_DVB_TELETEXT,
412 CODEC_ID_MICRODVD = MKBETAG('m','D','V','D'),
414 /* other specific kind of codecs (generally used for attachments) */
415 CODEC_ID_FIRST_UNKNOWN = 0x18000, ///< A dummy ID pointing at the start of various fake codecs.
416 CODEC_ID_TTF = 0x18000,
417 CODEC_ID_BINTEXT = MKBETAG('B','T','X','T'),
418 CODEC_ID_XBIN = MKBETAG('X','B','I','N'),
419 CODEC_ID_IDF = MKBETAG( 0 ,'I','D','F'),
421 CODEC_ID_PROBE = 0x19000, ///< codec_id is not known (like CODEC_ID_NONE) but lavf should attempt to identify it
423 CODEC_ID_MPEG2TS = 0x20000, /**< _FAKE_ codec to indicate a raw MPEG-2 TS
424 * stream (only used by libavformat) */
425 CODEC_ID_MPEG4SYSTEMS = 0x20001, /**< _FAKE_ codec to indicate a MPEG-4 Systems
426 * stream (only used by libavformat) */
427 CODEC_ID_FFMETADATA = 0x21000, ///< Dummy codec for streams containing only metadata information.
430 #if FF_API_OLD_DECODE_AUDIO
432 #define AVCODEC_MAX_AUDIO_FRAME_SIZE 192000 // 1 second of 48khz 32bit audio
436 * Required number of additionally allocated bytes at the end of the input bitstream for decoding.
437 * This is mainly needed because some optimized bitstream readers read
438 * 32 or 64 bit at once and could read over the end.<br>
439 * Note: If the first 23 bits of the additional bytes are not 0, then damaged
440 * MPEG bitstreams could cause overread and segfault.
442 #define FF_INPUT_BUFFER_PADDING_SIZE 16
445 * minimum encoding buffer size
446 * Used to avoid some checks during header writing.
448 #define FF_MIN_BUFFER_SIZE 16384
452 * motion estimation type.
455 ME_ZERO = 1, ///< no search, that is use 0,0 vector whenever one is needed
459 ME_EPZS, ///< enhanced predictive zonal search
460 ME_X1, ///< reserved for experiments
461 ME_HEX, ///< hexagon based search
462 ME_UMH, ///< uneven multi-hexagon search
463 ME_ITER, ///< iterative search
464 ME_TESA, ///< transformed exhaustive search algorithm
468 /* We leave some space between them for extensions (drop some
469 * keyframes for intra-only or drop just some bidir frames). */
470 AVDISCARD_NONE =-16, ///< discard nothing
471 AVDISCARD_DEFAULT= 0, ///< discard useless packets like 0 size packets in avi
472 AVDISCARD_NONREF = 8, ///< discard all non reference
473 AVDISCARD_BIDIR = 16, ///< discard all bidirectional frames
474 AVDISCARD_NONKEY = 32, ///< discard all frames except keyframes
475 AVDISCARD_ALL = 48, ///< discard all
478 enum AVColorPrimaries{
479 AVCOL_PRI_BT709 =1, ///< also ITU-R BT1361 / IEC 61966-2-4 / SMPTE RP177 Annex B
480 AVCOL_PRI_UNSPECIFIED=2,
482 AVCOL_PRI_BT470BG =5, ///< also ITU-R BT601-6 625 / ITU-R BT1358 625 / ITU-R BT1700 625 PAL & SECAM
483 AVCOL_PRI_SMPTE170M =6, ///< also ITU-R BT601-6 525 / ITU-R BT1358 525 / ITU-R BT1700 NTSC
484 AVCOL_PRI_SMPTE240M =7, ///< functionally identical to above
486 AVCOL_PRI_NB , ///< Not part of ABI
489 enum AVColorTransferCharacteristic{
490 AVCOL_TRC_BT709 =1, ///< also ITU-R BT1361
491 AVCOL_TRC_UNSPECIFIED=2,
492 AVCOL_TRC_GAMMA22 =4, ///< also ITU-R BT470M / ITU-R BT1700 625 PAL & SECAM
493 AVCOL_TRC_GAMMA28 =5, ///< also ITU-R BT470BG
494 AVCOL_TRC_SMPTE240M =7,
495 AVCOL_TRC_NB , ///< Not part of ABI
500 AVCOL_SPC_BT709 =1, ///< also ITU-R BT1361 / IEC 61966-2-4 xvYCC709 / SMPTE RP177 Annex B
501 AVCOL_SPC_UNSPECIFIED=2,
503 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
504 AVCOL_SPC_SMPTE170M =6, ///< also ITU-R BT601-6 525 / ITU-R BT1358 525 / ITU-R BT1700 NTSC / functionally identical to above
505 AVCOL_SPC_SMPTE240M =7,
507 AVCOL_SPC_NB , ///< Not part of ABI
511 AVCOL_RANGE_UNSPECIFIED=0,
512 AVCOL_RANGE_MPEG =1, ///< the normal 219*2^(n-8) "MPEG" YUV ranges
513 AVCOL_RANGE_JPEG =2, ///< the normal 2^n-1 "JPEG" YUV ranges
514 AVCOL_RANGE_NB , ///< Not part of ABI
518 * X X 3 4 X X are luma samples,
519 * 1 2 1-6 are possible chroma positions
520 * X X 5 6 X 0 is undefined/unknown position
522 enum AVChromaLocation{
523 AVCHROMA_LOC_UNSPECIFIED=0,
524 AVCHROMA_LOC_LEFT =1, ///< mpeg2/4, h264 default
525 AVCHROMA_LOC_CENTER =2, ///< mpeg1, jpeg, h263
526 AVCHROMA_LOC_TOPLEFT =3, ///< DV
528 AVCHROMA_LOC_BOTTOMLEFT =5,
529 AVCHROMA_LOC_BOTTOM =6,
530 AVCHROMA_LOC_NB , ///< Not part of ABI
533 enum AVAudioServiceType {
534 AV_AUDIO_SERVICE_TYPE_MAIN = 0,
535 AV_AUDIO_SERVICE_TYPE_EFFECTS = 1,
536 AV_AUDIO_SERVICE_TYPE_VISUALLY_IMPAIRED = 2,
537 AV_AUDIO_SERVICE_TYPE_HEARING_IMPAIRED = 3,
538 AV_AUDIO_SERVICE_TYPE_DIALOGUE = 4,
539 AV_AUDIO_SERVICE_TYPE_COMMENTARY = 5,
540 AV_AUDIO_SERVICE_TYPE_EMERGENCY = 6,
541 AV_AUDIO_SERVICE_TYPE_VOICE_OVER = 7,
542 AV_AUDIO_SERVICE_TYPE_KARAOKE = 8,
543 AV_AUDIO_SERVICE_TYPE_NB , ///< Not part of ABI
546 typedef struct RcOverride{
549 int qscale; // If this is 0 then quality_factor will be used instead.
550 float quality_factor;
553 #define FF_MAX_B_FRAMES 16
556 These flags can be passed in AVCodecContext.flags before initialization.
557 Note: Not everything is supported yet.
560 #define CODEC_FLAG_QSCALE 0x0002 ///< Use fixed qscale.
561 #define CODEC_FLAG_4MV 0x0004 ///< 4 MV per MB allowed / advanced prediction for H.263.
562 #define CODEC_FLAG_QPEL 0x0010 ///< Use qpel MC.
563 #define CODEC_FLAG_GMC 0x0020 ///< Use GMC.
564 #define CODEC_FLAG_MV0 0x0040 ///< Always try a MB with MV=<0,0>.
566 * The parent program guarantees that the input for B-frames containing
567 * streams is not written to for at least s->max_b_frames+1 frames, if
568 * this is not set the input will be copied.
570 #define CODEC_FLAG_INPUT_PRESERVED 0x0100
571 #define CODEC_FLAG_PASS1 0x0200 ///< Use internal 2pass ratecontrol in first pass mode.
572 #define CODEC_FLAG_PASS2 0x0400 ///< Use internal 2pass ratecontrol in second pass mode.
573 #define CODEC_FLAG_GRAY 0x2000 ///< Only decode/encode grayscale.
574 #define CODEC_FLAG_EMU_EDGE 0x4000 ///< Don't draw edges.
575 #define CODEC_FLAG_PSNR 0x8000 ///< error[?] variables will be set during encoding.
576 #define CODEC_FLAG_TRUNCATED 0x00010000 /** Input bitstream might be truncated at a random
577 location instead of only at frame boundaries. */
578 #define CODEC_FLAG_NORMALIZE_AQP 0x00020000 ///< Normalize adaptive quantization.
579 #define CODEC_FLAG_INTERLACED_DCT 0x00040000 ///< Use interlaced DCT.
580 #define CODEC_FLAG_LOW_DELAY 0x00080000 ///< Force low delay.
581 #define CODEC_FLAG_GLOBAL_HEADER 0x00400000 ///< Place global headers in extradata instead of every keyframe.
582 #define CODEC_FLAG_BITEXACT 0x00800000 ///< Use only bitexact stuff (except (I)DCT).
583 /* Fx : Flag for h263+ extra options */
584 #define CODEC_FLAG_AC_PRED 0x01000000 ///< H.263 advanced intra coding / MPEG-4 AC prediction
585 #define CODEC_FLAG_LOOP_FILTER 0x00000800 ///< loop filter
586 #define CODEC_FLAG_INTERLACED_ME 0x20000000 ///< interlaced motion estimation
587 #define CODEC_FLAG_CLOSED_GOP 0x80000000
588 #define CODEC_FLAG2_FAST 0x00000001 ///< Allow non spec compliant speedup tricks.
589 #define CODEC_FLAG2_NO_OUTPUT 0x00000004 ///< Skip bitstream encoding.
590 #define CODEC_FLAG2_LOCAL_HEADER 0x00000008 ///< Place global headers at every keyframe instead of in extradata.
591 #define CODEC_FLAG2_DROP_FRAME_TIMECODE 0x00002000 ///< timecode is in drop frame format. DEPRECATED!!!!
592 #if FF_API_MPV_GLOBAL_OPTS
593 #define CODEC_FLAG_CBP_RD 0x04000000 ///< Use rate distortion optimization for cbp.
594 #define CODEC_FLAG_QP_RD 0x08000000 ///< Use rate distortion optimization for qp selectioon.
595 #define CODEC_FLAG2_STRICT_GOP 0x00000002 ///< Strictly enforce GOP size.
596 #define CODEC_FLAG2_SKIP_RD 0x00004000 ///< RD optimal MB level residual skipping
598 #define CODEC_FLAG2_CHUNKS 0x00008000 ///< Input bitstream might be truncated at a packet boundaries instead of only at frame boundaries.
599 #define CODEC_FLAG2_SHOW_ALL 0x00400000 ///< Show all frames before the first keyframe
601 /* Unsupported options :
602 * Syntax Arithmetic coding (SAC)
603 * Reference Picture Selection
604 * Independent Segment Decoding */
606 /* codec capabilities */
608 #define CODEC_CAP_DRAW_HORIZ_BAND 0x0001 ///< Decoder can use draw_horiz_band callback.
610 * Codec uses get_buffer() for allocating buffers and supports custom allocators.
611 * If not set, it might not use get_buffer() at all or use operations that
612 * assume the buffer was allocated by avcodec_default_get_buffer.
614 #define CODEC_CAP_DR1 0x0002
615 #define CODEC_CAP_TRUNCATED 0x0008
616 /* Codec can export data for HW decoding (XvMC). */
617 #define CODEC_CAP_HWACCEL 0x0010
619 * Encoder or decoder requires flushing with NULL input at the end in order to
620 * give the complete and correct output.
622 * NOTE: If this flag is not set, the codec is guaranteed to never be fed with
623 * with NULL data. The user can still send NULL data to the public encode
624 * or decode function, but libavcodec will not pass it along to the codec
625 * unless this flag is set.
628 * The decoder has a non-zero delay and needs to be fed with avpkt->data=NULL,
629 * avpkt->size=0 at the end to get the delayed data until the decoder no longer
633 * The encoder needs to be fed with NULL data at the end of encoding until the
634 * encoder no longer returns data.
636 * NOTE: For encoders implementing the AVCodec.encode2() function, setting this
637 * flag also means that the encoder must set the pts and duration for
638 * each output packet. If this flag is not set, the pts and duration will
639 * be determined by libavcodec from the input frame.
641 #define CODEC_CAP_DELAY 0x0020
643 * Codec can be fed a final frame with a smaller size.
644 * This can be used to prevent truncation of the last audio samples.
646 #define CODEC_CAP_SMALL_LAST_FRAME 0x0040
648 * Codec can export data for HW decoding (VDPAU).
650 #define CODEC_CAP_HWACCEL_VDPAU 0x0080
652 * Codec can output multiple frames per AVPacket
653 * Normally demuxers return one frame at a time, demuxers which do not do
654 * are connected to a parser to split what they return into proper frames.
655 * This flag is reserved to the very rare category of codecs which have a
656 * bitstream that cannot be split into frames without timeconsuming
657 * operations like full decoding. Demuxers carring such bitstreams thus
658 * may return multiple frames in a packet. This has many disadvantages like
659 * prohibiting stream copy in many cases thus it should only be considered
662 #define CODEC_CAP_SUBFRAMES 0x0100
664 * Codec is experimental and is thus avoided in favor of non experimental
667 #define CODEC_CAP_EXPERIMENTAL 0x0200
669 * Codec should fill in channel configuration and samplerate instead of container
671 #define CODEC_CAP_CHANNEL_CONF 0x0400
674 * Codec is able to deal with negative linesizes
676 #define CODEC_CAP_NEG_LINESIZES 0x0800
679 * Codec supports frame-level multithreading.
681 #define CODEC_CAP_FRAME_THREADS 0x1000
683 * Codec supports slice-based (or partition-based) multithreading.
685 #define CODEC_CAP_SLICE_THREADS 0x2000
687 * Codec supports changed parameters at any point.
689 #define CODEC_CAP_PARAM_CHANGE 0x4000
691 * Codec supports avctx->thread_count == 0 (auto).
693 #define CODEC_CAP_AUTO_THREADS 0x8000
695 * Audio encoder supports receiving a different number of samples in each call.
697 #define CODEC_CAP_VARIABLE_FRAME_SIZE 0x10000
701 #define CODEC_CAP_LOSSLESS 0x80000000
703 //The following defines may change, don't expect compatibility if you use them.
704 #define MB_TYPE_INTRA4x4 0x0001
705 #define MB_TYPE_INTRA16x16 0x0002 //FIXME H.264-specific
706 #define MB_TYPE_INTRA_PCM 0x0004 //FIXME H.264-specific
707 #define MB_TYPE_16x16 0x0008
708 #define MB_TYPE_16x8 0x0010
709 #define MB_TYPE_8x16 0x0020
710 #define MB_TYPE_8x8 0x0040
711 #define MB_TYPE_INTERLACED 0x0080
712 #define MB_TYPE_DIRECT2 0x0100 //FIXME
713 #define MB_TYPE_ACPRED 0x0200
714 #define MB_TYPE_GMC 0x0400
715 #define MB_TYPE_SKIP 0x0800
716 #define MB_TYPE_P0L0 0x1000
717 #define MB_TYPE_P1L0 0x2000
718 #define MB_TYPE_P0L1 0x4000
719 #define MB_TYPE_P1L1 0x8000
720 #define MB_TYPE_L0 (MB_TYPE_P0L0 | MB_TYPE_P1L0)
721 #define MB_TYPE_L1 (MB_TYPE_P0L1 | MB_TYPE_P1L1)
722 #define MB_TYPE_L0L1 (MB_TYPE_L0 | MB_TYPE_L1)
723 #define MB_TYPE_QUANT 0x00010000
724 #define MB_TYPE_CBP 0x00020000
725 //Note bits 24-31 are reserved for codec specific use (h264 ref0, mpeg1 0mv, ...)
729 * This specifies the area which should be displayed.
730 * Note there may be multiple such areas for one frame.
732 typedef struct AVPanScan{
735 * - encoding: Set by user.
736 * - decoding: Set by libavcodec.
741 * width and height in 1/16 pel
742 * - encoding: Set by user.
743 * - decoding: Set by libavcodec.
749 * position of the top left corner in 1/16 pel for up to 3 fields/frames
750 * - encoding: Set by user.
751 * - decoding: Set by libavcodec.
753 int16_t position[3][2];
756 #define FF_QSCALE_TYPE_MPEG1 0
757 #define FF_QSCALE_TYPE_MPEG2 1
758 #define FF_QSCALE_TYPE_H264 2
759 #define FF_QSCALE_TYPE_VP56 3
761 #define FF_BUFFER_TYPE_INTERNAL 1
762 #define FF_BUFFER_TYPE_USER 2 ///< direct rendering buffers (image is (de)allocated by user)
763 #define FF_BUFFER_TYPE_SHARED 4 ///< Buffer from somewhere else; don't deallocate image (data/base), all other tables are not shared.
764 #define FF_BUFFER_TYPE_COPY 8 ///< Just a (modified) copy of some other buffer, don't deallocate anything.
766 #define FF_BUFFER_HINTS_VALID 0x01 // Buffer hints value is meaningful (if 0 ignore).
767 #define FF_BUFFER_HINTS_READABLE 0x02 // Codec will read from buffer.
768 #define FF_BUFFER_HINTS_PRESERVE 0x04 // User must not alter buffer content.
769 #define FF_BUFFER_HINTS_REUSABLE 0x08 // Codec will reuse the buffer (update).
771 enum AVPacketSideDataType {
773 AV_PKT_DATA_NEW_EXTRADATA,
774 AV_PKT_DATA_PARAM_CHANGE,
775 AV_PKT_DATA_H263_MB_INFO,
778 typedef struct AVPacket {
780 * Presentation timestamp in AVStream->time_base units; the time at which
781 * the decompressed packet will be presented to the user.
782 * Can be AV_NOPTS_VALUE if it is not stored in the file.
783 * pts MUST be larger or equal to dts as presentation cannot happen before
784 * decompression, unless one wants to view hex dumps. Some formats misuse
785 * the terms dts and pts/cts to mean something different. Such timestamps
786 * must be converted to true pts/dts before they are stored in AVPacket.
790 * Decompression timestamp in AVStream->time_base units; the time at which
791 * the packet is decompressed.
792 * Can be AV_NOPTS_VALUE if it is not stored in the file.
799 * A combination of AV_PKT_FLAG values
803 * Additional packet data that can be provided by the container.
804 * Packet can contain several types of side information.
809 enum AVPacketSideDataType type;
814 * Duration of this packet in AVStream->time_base units, 0 if unknown.
815 * Equals next_pts - this_pts in presentation order.
818 void (*destruct)(struct AVPacket *);
820 int64_t pos; ///< byte position in stream, -1 if unknown
823 * Time difference in AVStream->time_base units from the pts of this
824 * packet to the point at which the output from the decoder has converged
825 * independent from the availability of previous frames. That is, the
826 * frames are virtually identical no matter if decoding started from
827 * the very first frame or from this keyframe.
828 * Is AV_NOPTS_VALUE if unknown.
829 * This field is not the display duration of the current packet.
830 * This field has no meaning if the packet does not have AV_PKT_FLAG_KEY
833 * The purpose of this field is to allow seeking in streams that have no
834 * keyframes in the conventional sense. It corresponds to the
835 * recovery point SEI in H.264 and match_time_delta in NUT. It is also
836 * essential for some types of subtitle streams to ensure that all
837 * subtitles are correctly displayed after seeking.
839 int64_t convergence_duration;
841 #define AV_PKT_FLAG_KEY 0x0001 ///< The packet contains a keyframe
842 #define AV_PKT_FLAG_CORRUPT 0x0002 ///< The packet content is corrupted
845 * An AV_PKT_DATA_PARAM_CHANGE side data packet is laid out as follows:
847 * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_COUNT)
848 * s32le channel_count
849 * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_LAYOUT)
850 * u64le channel_layout
851 * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_SAMPLE_RATE)
853 * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_DIMENSIONS)
859 * An AV_PKT_DATA_H263_MB_INFO side data packet contains a number of
860 * structures with info about macroblocks relevant to splitting the
861 * packet into smaller packets on macroblock edges (e.g. as for RFC 2190).
862 * That is, it does not necessarily contain info about all macroblocks,
863 * as long as the distance between macroblocks in the info is smaller
864 * than the target payload size.
865 * Each MB info structure is 12 bytes, and is laid out as follows:
866 * u32le bit offset from the start of the packet
867 * u8 current quantizer at the start of the macroblock
869 * u16le macroblock address within the GOB
870 * u8 horizontal MV predictor
871 * u8 vertical MV predictor
872 * u8 horizontal MV predictor for block number 3
873 * u8 vertical MV predictor for block number 3
876 enum AVSideDataParamChangeFlags {
877 AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_COUNT = 0x0001,
878 AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_LAYOUT = 0x0002,
879 AV_SIDE_DATA_PARAM_CHANGE_SAMPLE_RATE = 0x0004,
880 AV_SIDE_DATA_PARAM_CHANGE_DIMENSIONS = 0x0008,
885 * New fields can be added to the end of AVFRAME with minor version
886 * bumps. Similarly fields that are marked as to be only accessed by
887 * av_opt_ptr() can be reordered. This allows 2 forks to add fields
888 * without breaking compatibility with each other.
889 * Removal, reordering and changes in the remaining cases require
890 * a major version bump.
891 * sizeof(AVFrame) must not be used outside libavcodec.
893 typedef struct AVFrame {
894 #define AV_NUM_DATA_POINTERS 8
896 * pointer to the picture/channel planes.
897 * This might be different from the first allocated byte
898 * - encoding: Set by user
899 * - decoding: set by AVCodecContext.get_buffer()
901 uint8_t *data[AV_NUM_DATA_POINTERS];
904 * Size, in bytes, of the data for each picture/channel plane.
906 * For audio, only linesize[0] may be set. For planar audio, each channel
907 * plane must be the same size.
909 * - encoding: Set by user
910 * - decoding: set by AVCodecContext.get_buffer()
912 int linesize[AV_NUM_DATA_POINTERS];
915 * pointers to the data planes/channels.
917 * For video, this should simply point to data[].
919 * For planar audio, each channel has a separate data pointer, and
920 * linesize[0] contains the size of each channel buffer.
921 * For packed audio, there is just one data pointer, and linesize[0]
922 * contains the total size of the buffer for all channels.
924 * Note: Both data and extended_data will always be set by get_buffer(),
925 * but for planar audio with more channels that can fit in data,
926 * extended_data must be used by the decoder in order to access all
930 * decoding: set by AVCodecContext.get_buffer()
932 uint8_t **extended_data;
935 * width and height of the video frame
937 * - decoding: Read by user.
942 * number of audio samples (per channel) described by this frame
943 * - encoding: Set by user
944 * - decoding: Set by libavcodec
949 * format of the frame, -1 if unknown or unset
950 * Values correspond to enum PixelFormat for video frames,
951 * enum AVSampleFormat for audio)
953 * - decoding: Read by user.
958 * 1 -> keyframe, 0-> not
959 * - encoding: Set by libavcodec.
960 * - decoding: Set by libavcodec.
965 * Picture type of the frame, see ?_TYPE below.
966 * - encoding: Set by libavcodec. for coded_picture (and set by user for input).
967 * - decoding: Set by libavcodec.
969 enum AVPictureType pict_type;
972 * pointer to the first allocated byte of the picture. Can be used in get_buffer/release_buffer.
973 * This isn't used by libavcodec unless the default get/release_buffer() is used.
977 uint8_t *base[AV_NUM_DATA_POINTERS];
980 * sample aspect ratio for the video frame, 0/1 if unknown\unspecified
982 * - decoding: Read by user.
984 AVRational sample_aspect_ratio;
987 * presentation timestamp in time_base units (time when frame should be shown to user)
988 * If AV_NOPTS_VALUE then frame_rate = 1/time_base will be assumed.
989 * - encoding: MUST be set by user.
990 * - decoding: Set by libavcodec.
995 * reordered pts from the last AVPacket that has been input into the decoder
997 * - decoding: Read by user.
1002 * dts from the last AVPacket that has been input into the decoder
1003 * - encoding: unused
1004 * - decoding: Read by user.
1009 * picture number in bitstream order
1010 * - encoding: set by
1011 * - decoding: Set by libavcodec.
1013 int coded_picture_number;
1015 * picture number in display order
1016 * - encoding: set by
1017 * - decoding: Set by libavcodec.
1019 int display_picture_number;
1022 * quality (between 1 (good) and FF_LAMBDA_MAX (bad))
1023 * - encoding: Set by libavcodec. for coded_picture (and set by user for input).
1024 * - decoding: Set by libavcodec.
1029 * is this picture used as reference
1030 * The values for this are the same as the MpegEncContext.picture_structure
1031 * variable, that is 1->top field, 2->bottom field, 3->frame/both fields.
1032 * Set to 4 for delayed, non-reference frames.
1033 * - encoding: unused
1034 * - decoding: Set by libavcodec. (before get_buffer() call)).
1040 * - encoding: unused
1041 * - decoding: Set by libavcodec.
1043 int8_t *qscale_table;
1046 * - encoding: unused
1047 * - decoding: Set by libavcodec.
1057 * mbskip_table[mb]>=1 if MB didn't change
1058 * stride= mb_width = (width+15)>>4
1059 * - encoding: unused
1060 * - decoding: Set by libavcodec.
1062 uint8_t *mbskip_table;
1065 * motion vector table
1068 * int mv_sample_log2= 4 - motion_subsample_log2;
1069 * int mb_width= (width+15)>>4;
1070 * int mv_stride= (mb_width << mv_sample_log2) + 1;
1071 * motion_val[direction][x + y*mv_stride][0->mv_x, 1->mv_y];
1073 * - encoding: Set by user.
1074 * - decoding: Set by libavcodec.
1076 int16_t (*motion_val[2])[2];
1079 * macroblock type table
1080 * mb_type_base + mb_width + 2
1081 * - encoding: Set by user.
1082 * - decoding: Set by libavcodec.
1088 * - encoding: unused
1089 * - decoding: Set by libavcodec.
1094 * motion reference frame index
1095 * the order in which these are stored can depend on the codec.
1096 * - encoding: Set by user.
1097 * - decoding: Set by libavcodec.
1099 int8_t *ref_index[2];
1102 * for some private data of the user
1103 * - encoding: unused
1104 * - decoding: Set by user.
1110 * - encoding: Set by libavcodec. if flags&CODEC_FLAG_PSNR.
1111 * - decoding: unused
1113 uint64_t error[AV_NUM_DATA_POINTERS];
1116 * type of the buffer (to keep track of who has to deallocate data[*])
1117 * - encoding: Set by the one who allocates it.
1118 * - decoding: Set by the one who allocates it.
1119 * Note: User allocated (direct rendering) & internal buffers cannot coexist currently.
1124 * When decoding, this signals how much the picture must be delayed.
1125 * extra_delay = repeat_pict / (2*fps)
1126 * - encoding: unused
1127 * - decoding: Set by libavcodec.
1132 * The content of the picture is interlaced.
1133 * - encoding: Set by user.
1134 * - decoding: Set by libavcodec. (default 0)
1136 int interlaced_frame;
1139 * If the content is interlaced, is top field displayed first.
1140 * - encoding: Set by user.
1141 * - decoding: Set by libavcodec.
1143 int top_field_first;
1146 * Tell user application that palette has changed from previous frame.
1147 * - encoding: ??? (no palette-enabled encoder yet)
1148 * - decoding: Set by libavcodec. (default 0).
1150 int palette_has_changed;
1153 * codec suggestion on buffer type if != 0
1154 * - encoding: unused
1155 * - decoding: Set by libavcodec. (before get_buffer() call)).
1161 * - encoding: Set by user.
1162 * - decoding: Set by libavcodec.
1164 AVPanScan *pan_scan;
1167 * reordered opaque 64bit (generally an integer or a double precision float
1168 * PTS but can be anything).
1169 * The user sets AVCodecContext.reordered_opaque to represent the input at
1171 * the decoder reorders values as needed and sets AVFrame.reordered_opaque
1172 * to exactly one of the values provided by the user through AVCodecContext.reordered_opaque
1173 * @deprecated in favor of pkt_pts
1174 * - encoding: unused
1175 * - decoding: Read by user.
1177 int64_t reordered_opaque;
1180 * hardware accelerator private data (FFmpeg-allocated)
1181 * - encoding: unused
1182 * - decoding: Set by libavcodec
1184 void *hwaccel_picture_private;
1187 * the AVCodecContext which ff_thread_get_buffer() was last called on
1188 * - encoding: Set by libavcodec.
1189 * - decoding: Set by libavcodec.
1191 struct AVCodecContext *owner;
1194 * used by multithreading to store frame-specific info
1195 * - encoding: Set by libavcodec.
1196 * - decoding: Set by libavcodec.
1198 void *thread_opaque;
1201 * log2 of the size of the block which a single vector in motion_val represents:
1202 * (4->16x16, 3->8x8, 2-> 4x4, 1-> 2x2)
1203 * - encoding: unused
1204 * - decoding: Set by libavcodec.
1206 uint8_t motion_subsample_log2;
1209 * frame timestamp estimated using various heuristics, in stream time base
1210 * Code outside libavcodec should access this field using:
1211 * av_opt_ptr(avcodec_get_frame_class(), frame, "best_effort_timestamp");
1212 * - encoding: unused
1213 * - decoding: set by libavcodec, read by user.
1215 int64_t best_effort_timestamp;
1218 * reordered pos from the last AVPacket that has been input into the decoder
1219 * Code outside libavcodec should access this field using:
1220 * av_opt_ptr(avcodec_get_frame_class(), frame, "pkt_pos");
1221 * - encoding: unused
1222 * - decoding: Read by user.
1227 struct AVCodecInternal;
1231 AV_FIELD_PROGRESSIVE,
1232 AV_FIELD_TT, //< Top coded_first, top displayed first
1233 AV_FIELD_BB, //< Bottom coded first, bottom displayed first
1234 AV_FIELD_TB, //< Top coded first, bottom displayed first
1235 AV_FIELD_BT, //< Bottom coded first, top displayed first
1239 * main external API structure.
1240 * New fields can be added to the end with minor version bumps.
1241 * Removal, reordering and changes to existing fields require a major
1243 * Please use AVOptions (av_opt* / av_set/get*()) to access these fields from user
1245 * sizeof(AVCodecContext) must not be used outside libav*.
1247 typedef struct AVCodecContext {
1249 * information on struct for av_log
1250 * - set by avcodec_alloc_context3
1252 const AVClass *av_class;
1253 int log_level_offset;
1255 enum AVMediaType codec_type; /* see AVMEDIA_TYPE_xxx */
1256 struct AVCodec *codec;
1257 char codec_name[32];
1258 enum CodecID codec_id; /* see CODEC_ID_xxx */
1261 * fourcc (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A').
1262 * This is used to work around some encoder bugs.
1263 * A demuxer should set this to what is stored in the field used to identify the codec.
1264 * If there are multiple such fields in a container then the demuxer should choose the one
1265 * which maximizes the information about the used codec.
1266 * If the codec tag field in a container is larger than 32 bits then the demuxer should
1267 * remap the longer ID to 32 bits with a table or other structure. Alternatively a new
1268 * extra_codec_tag + size could be added but for this a clear advantage must be demonstrated
1270 * - encoding: Set by user, if not then the default based on codec_id will be used.
1271 * - decoding: Set by user, will be converted to uppercase by libavcodec during init.
1273 unsigned int codec_tag;
1276 * fourcc from the AVI stream header (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A').
1277 * This is used to work around some encoder bugs.
1278 * - encoding: unused
1279 * - decoding: Set by user, will be converted to uppercase by libavcodec during init.
1281 unsigned int stream_codec_tag;
1284 * Some codecs need additional format info. It is stored here.
1285 * If any muxer uses this then ALL demuxers/parsers AND encoders for the
1286 * specific codec MUST set it correctly otherwise stream copy breaks.
1287 * In general use of this field by muxers is not recommended.
1288 * - encoding: Set by libavcodec.
1289 * - decoding: Set by libavcodec. (FIXME: Is this OK?)
1296 * Private context used for internal data.
1298 * Unlike priv_data, this is not codec-specific. It is used in general
1299 * libavcodec functions.
1301 struct AVCodecInternal *internal;
1304 * Private data of the user, can be used to carry app specific stuff.
1305 * - encoding: Set by user.
1306 * - decoding: Set by user.
1311 * the average bitrate
1312 * - encoding: Set by user; unused for constant quantizer encoding.
1313 * - decoding: Set by libavcodec. 0 or some bitrate if this info is available in the stream.
1318 * number of bits the bitstream is allowed to diverge from the reference.
1319 * the reference can be CBR (for CBR pass1) or VBR (for pass2)
1320 * - encoding: Set by user; unused for constant quantizer encoding.
1321 * - decoding: unused
1323 int bit_rate_tolerance;
1326 * Global quality for codecs which cannot change it per frame.
1327 * This should be proportional to MPEG-1/2/4 qscale.
1328 * - encoding: Set by user.
1329 * - decoding: unused
1334 * - encoding: Set by user.
1335 * - decoding: unused
1337 int compression_level;
1338 #define FF_COMPRESSION_DEFAULT -1
1342 * - encoding: Set by user.
1343 * - decoding: Set by user.
1349 * - encoding: Set by user.
1350 * - decoding: Set by user.
1355 * some codecs need / can use extradata like Huffman tables.
1356 * mjpeg: Huffman tables
1357 * rv10: additional flags
1358 * mpeg4: global headers (they can be in the bitstream or here)
1359 * The allocated memory should be FF_INPUT_BUFFER_PADDING_SIZE bytes larger
1360 * than extradata_size to avoid prolems if it is read with the bitstream reader.
1361 * The bytewise contents of extradata must not depend on the architecture or CPU endianness.
1362 * - encoding: Set/allocated/freed by libavcodec.
1363 * - decoding: Set/allocated/freed by user.
1369 * This is the fundamental unit of time (in seconds) in terms
1370 * of which frame timestamps are represented. For fixed-fps content,
1371 * timebase should be 1/framerate and timestamp increments should be
1373 * - encoding: MUST be set by user.
1374 * - decoding: Set by libavcodec.
1376 AVRational time_base;
1379 * For some codecs, the time base is closer to the field rate than the frame rate.
1380 * Most notably, H.264 and MPEG-2 specify time_base as half of frame duration
1381 * if no telecine is used ...
1383 * Set to time_base ticks per frame. Default 1, e.g., H.264/MPEG-2 set it to 2.
1385 int ticks_per_frame;
1388 * Encoding: Number of frames delay there will be from the encoder input to
1389 * the decoder output. (we assume the decoder matches the spec)
1390 * Decoding: Number of frames delay in addition to what a standard decoder
1391 * as specified in the spec would produce.
1394 * Number of frames the decoded output will be delayed relative to the
1398 * Number of "priming" samples added to the beginning of the stream
1399 * during encoding. The decoded output will be delayed by this many
1400 * samples relative to the input to the encoder. Note that this field is
1401 * purely informational and does not directly affect the pts output by
1402 * the encoder, which should always be based on the actual presentation
1403 * time, including any delay.
1405 * - encoding: Set by libavcodec.
1406 * - decoding: Set by libavcodec.
1413 * picture width / height.
1414 * - encoding: MUST be set by user.
1415 * - decoding: Set by libavcodec.
1416 * Note: For compatibility it is possible to set this instead of
1417 * coded_width/height before decoding.
1422 * Bitstream width / height, may be different from width/height if lowres enabled.
1423 * - encoding: unused
1424 * - decoding: Set by user before init if known. Codec should override / dynamically change if needed.
1426 int coded_width, coded_height;
1428 #define FF_ASPECT_EXTENDED 15
1431 * the number of pictures in a group of pictures, or 0 for intra_only
1432 * - encoding: Set by user.
1433 * - decoding: unused
1438 * Pixel format, see PIX_FMT_xxx.
1439 * May be set by the demuxer if known from headers.
1440 * May be overriden by the decoder if it knows better.
1441 * - encoding: Set by user.
1442 * - decoding: Set by user if known, overridden by libavcodec if known
1444 enum PixelFormat pix_fmt;
1447 * Motion estimation algorithm used for video coding.
1448 * 1 (zero), 2 (full), 3 (log), 4 (phods), 5 (epzs), 6 (x1), 7 (hex),
1449 * 8 (umh), 9 (iter), 10 (tesa) [7, 8, 10 are x264 specific, 9 is snow specific]
1450 * - encoding: MUST be set by user.
1451 * - decoding: unused
1456 * If non NULL, 'draw_horiz_band' is called by the libavcodec
1457 * decoder to draw a horizontal band. It improves cache usage. Not
1458 * all codecs can do that. You must check the codec capabilities
1460 * When multithreading is used, it may be called from multiple threads
1461 * at the same time; threads might draw different parts of the same AVFrame,
1462 * or multiple AVFrames, and there is no guarantee that slices will be drawn
1464 * The function is also used by hardware acceleration APIs.
1465 * It is called at least once during frame decoding to pass
1466 * the data needed for hardware render.
1467 * In that mode instead of pixel data, AVFrame points to
1468 * a structure specific to the acceleration API. The application
1469 * reads the structure and can change some fields to indicate progress
1471 * - encoding: unused
1472 * - decoding: Set by user.
1473 * @param height the height of the slice
1474 * @param y the y position of the slice
1475 * @param type 1->top field, 2->bottom field, 3->frame
1476 * @param offset offset into the AVFrame.data from which the slice should be read
1478 void (*draw_horiz_band)(struct AVCodecContext *s,
1479 const AVFrame *src, int offset[AV_NUM_DATA_POINTERS],
1480 int y, int type, int height);
1483 * callback to negotiate the pixelFormat
1484 * @param fmt is the list of formats which are supported by the codec,
1485 * it is terminated by -1 as 0 is a valid format, the formats are ordered by quality.
1486 * The first is always the native one.
1487 * @return the chosen format
1488 * - encoding: unused
1489 * - decoding: Set by user, if not set the native format will be chosen.
1491 enum PixelFormat (*get_format)(struct AVCodecContext *s, const enum PixelFormat * fmt);
1494 * maximum number of B-frames between non-B-frames
1495 * Note: The output will be delayed by max_b_frames+1 relative to the input.
1496 * - encoding: Set by user.
1497 * - decoding: unused
1502 * qscale factor between IP and B-frames
1503 * If > 0 then the last P-frame quantizer will be used (q= lastp_q*factor+offset).
1504 * If < 0 then normal ratecontrol will be done (q= -normal_q*factor+offset).
1505 * - encoding: Set by user.
1506 * - decoding: unused
1508 float b_quant_factor;
1510 /** obsolete FIXME remove */
1512 #define FF_RC_STRATEGY_XVID 1
1514 int b_frame_strategy;
1516 #if FF_API_MPV_GLOBAL_OPTS
1518 * luma single coefficient elimination threshold
1519 * - encoding: Set by user.
1520 * - decoding: unused
1522 attribute_deprecated int luma_elim_threshold;
1525 * chroma single coeff elimination threshold
1526 * - encoding: Set by user.
1527 * - decoding: unused
1529 attribute_deprecated int chroma_elim_threshold;
1533 * qscale offset between IP and B-frames
1534 * - encoding: Set by user.
1535 * - decoding: unused
1537 float b_quant_offset;
1540 * Size of the frame reordering buffer in the decoder.
1541 * For MPEG-2 it is 1 IPB or 0 low delay IP.
1542 * - encoding: Set by libavcodec.
1543 * - decoding: Set by libavcodec.
1548 * 0-> h263 quant 1-> mpeg quant
1549 * - encoding: Set by user.
1550 * - decoding: unused
1555 * qscale factor between P and I-frames
1556 * If > 0 then the last p frame quantizer will be used (q= lastp_q*factor+offset).
1557 * If < 0 then normal ratecontrol will be done (q= -normal_q*factor+offset).
1558 * - encoding: Set by user.
1559 * - decoding: unused
1561 float i_quant_factor;
1564 * qscale offset between P and I-frames
1565 * - encoding: Set by user.
1566 * - decoding: unused
1568 float i_quant_offset;
1571 * luminance masking (0-> disabled)
1572 * - encoding: Set by user.
1573 * - decoding: unused
1578 * temporary complexity masking (0-> disabled)
1579 * - encoding: Set by user.
1580 * - decoding: unused
1582 float temporal_cplx_masking;
1585 * spatial complexity masking (0-> disabled)
1586 * - encoding: Set by user.
1587 * - decoding: unused
1589 float spatial_cplx_masking;
1592 * p block masking (0-> disabled)
1593 * - encoding: Set by user.
1594 * - decoding: unused
1599 * darkness masking (0-> disabled)
1600 * - encoding: Set by user.
1601 * - decoding: unused
1607 * - encoding: Set by libavcodec.
1608 * - decoding: Set by user (or 0).
1612 * prediction method (needed for huffyuv)
1613 * - encoding: Set by user.
1614 * - decoding: unused
1616 int prediction_method;
1617 #define FF_PRED_LEFT 0
1618 #define FF_PRED_PLANE 1
1619 #define FF_PRED_MEDIAN 2
1622 * slice offsets in the frame in bytes
1623 * - encoding: Set/allocated by libavcodec.
1624 * - decoding: Set/allocated by user (or NULL).
1629 * sample aspect ratio (0 if unknown)
1630 * That is the width of a pixel divided by the height of the pixel.
1631 * Numerator and denominator must be relatively prime and smaller than 256 for some video standards.
1632 * - encoding: Set by user.
1633 * - decoding: Set by libavcodec.
1635 AVRational sample_aspect_ratio;
1638 * motion estimation comparison function
1639 * - encoding: Set by user.
1640 * - decoding: unused
1644 * subpixel motion estimation comparison function
1645 * - encoding: Set by user.
1646 * - decoding: unused
1650 * macroblock comparison function (not supported yet)
1651 * - encoding: Set by user.
1652 * - decoding: unused
1656 * interlaced DCT comparison function
1657 * - encoding: Set by user.
1658 * - decoding: unused
1661 #define FF_CMP_SAD 0
1662 #define FF_CMP_SSE 1
1663 #define FF_CMP_SATD 2
1664 #define FF_CMP_DCT 3
1665 #define FF_CMP_PSNR 4
1666 #define FF_CMP_BIT 5
1668 #define FF_CMP_ZERO 7
1669 #define FF_CMP_VSAD 8
1670 #define FF_CMP_VSSE 9
1671 #define FF_CMP_NSSE 10
1672 #define FF_CMP_W53 11
1673 #define FF_CMP_W97 12
1674 #define FF_CMP_DCTMAX 13
1675 #define FF_CMP_DCT264 14
1676 #define FF_CMP_CHROMA 256
1679 * ME diamond size & shape
1680 * - encoding: Set by user.
1681 * - decoding: unused
1686 * amount of previous MV predictors (2a+1 x 2a+1 square)
1687 * - encoding: Set by user.
1688 * - decoding: unused
1690 int last_predictor_count;
1693 * prepass for motion estimation
1694 * - encoding: Set by user.
1695 * - decoding: unused
1700 * motion estimation prepass comparison function
1701 * - encoding: Set by user.
1702 * - decoding: unused
1707 * ME prepass diamond size & shape
1708 * - encoding: Set by user.
1709 * - decoding: unused
1715 * - encoding: Set by user.
1716 * - decoding: unused
1718 int me_subpel_quality;
1721 * DTG active format information (additional aspect ratio
1722 * information only used in DVB MPEG-2 transport streams)
1725 * - encoding: unused
1726 * - decoding: Set by decoder.
1728 int dtg_active_format;
1729 #define FF_DTG_AFD_SAME 8
1730 #define FF_DTG_AFD_4_3 9
1731 #define FF_DTG_AFD_16_9 10
1732 #define FF_DTG_AFD_14_9 11
1733 #define FF_DTG_AFD_4_3_SP_14_9 13
1734 #define FF_DTG_AFD_16_9_SP_14_9 14
1735 #define FF_DTG_AFD_SP_4_3 15
1738 * maximum motion estimation search range in subpel units
1739 * If 0 then no limit.
1741 * - encoding: Set by user.
1742 * - decoding: unused
1747 * intra quantizer bias
1748 * - encoding: Set by user.
1749 * - decoding: unused
1751 int intra_quant_bias;
1752 #define FF_DEFAULT_QUANT_BIAS 999999
1755 * inter quantizer bias
1756 * - encoding: Set by user.
1757 * - decoding: unused
1759 int inter_quant_bias;
1761 #if FF_API_COLOR_TABLE_ID
1764 * - encoding: unused
1765 * - decoding: Which clrtable should be used for 8bit RGB images.
1766 * Tables have to be stored somewhere. FIXME
1768 attribute_deprecated int color_table_id;
1773 * - encoding: unused
1774 * - decoding: Set by user.
1777 #define SLICE_FLAG_CODED_ORDER 0x0001 ///< draw_horiz_band() is called in coded order instead of display
1778 #define SLICE_FLAG_ALLOW_FIELD 0x0002 ///< allow draw_horiz_band() with field slices (MPEG2 field pics)
1779 #define SLICE_FLAG_ALLOW_PLANE 0x0004 ///< allow draw_horiz_band() with 1 component at a time (SVQ1)
1782 * XVideo Motion Acceleration
1783 * - encoding: forbidden
1784 * - decoding: set by decoder
1786 int xvmc_acceleration;
1789 * macroblock decision mode
1790 * - encoding: Set by user.
1791 * - decoding: unused
1794 #define FF_MB_DECISION_SIMPLE 0 ///< uses mb_cmp
1795 #define FF_MB_DECISION_BITS 1 ///< chooses the one which needs the fewest bits
1796 #define FF_MB_DECISION_RD 2 ///< rate distortion
1799 * custom intra quantization matrix
1800 * - encoding: Set by user, can be NULL.
1801 * - decoding: Set by libavcodec.
1803 uint16_t *intra_matrix;
1806 * custom inter quantization matrix
1807 * - encoding: Set by user, can be NULL.
1808 * - decoding: Set by libavcodec.
1810 uint16_t *inter_matrix;
1813 * scene change detection threshold
1814 * 0 is default, larger means fewer detected scene changes.
1815 * - encoding: Set by user.
1816 * - decoding: unused
1818 int scenechange_threshold;
1821 * noise reduction strength
1822 * - encoding: Set by user.
1823 * - decoding: unused
1825 int noise_reduction;
1827 #if FF_API_INTER_THRESHOLD
1829 * @deprecated this field is unused
1831 attribute_deprecated int inter_threshold;
1834 #if FF_API_MPV_GLOBAL_OPTS
1836 * @deprecated use mpegvideo private options instead
1838 attribute_deprecated int quantizer_noise_shaping;
1842 * Motion estimation threshold below which no motion estimation is
1843 * performed, but instead the user specified motion vectors are used.
1845 * - encoding: Set by user.
1846 * - decoding: unused
1851 * Macroblock threshold below which the user specified macroblock types will be used.
1852 * - encoding: Set by user.
1853 * - decoding: unused
1858 * precision of the intra DC coefficient - 8
1859 * - encoding: Set by user.
1860 * - decoding: unused
1862 int intra_dc_precision;
1865 * Number of macroblock rows at the top which are skipped.
1866 * - encoding: unused
1867 * - decoding: Set by user.
1872 * Number of macroblock rows at the bottom which are skipped.
1873 * - encoding: unused
1874 * - decoding: Set by user.
1879 * Border processing masking, raises the quantizer for mbs on the borders
1881 * - encoding: Set by user.
1882 * - decoding: unused
1884 float border_masking;
1887 * minimum MB lagrange multipler
1888 * - encoding: Set by user.
1889 * - decoding: unused
1894 * maximum MB lagrange multipler
1895 * - encoding: Set by user.
1896 * - decoding: unused
1902 * - encoding: Set by user.
1903 * - decoding: unused
1905 int me_penalty_compensation;
1909 * - encoding: Set by user.
1910 * - decoding: unused
1916 * - encoding: Set by user.
1917 * - decoding: unused
1923 * - encoding: Set by user.
1924 * - decoding: unused
1929 * number of reference frames
1930 * - encoding: Set by user.
1931 * - decoding: Set by lavc.
1936 * chroma qp offset from luma
1937 * - encoding: Set by user.
1938 * - decoding: unused
1943 * Multiplied by qscale for each frame and added to scene_change_score.
1944 * - encoding: Set by user.
1945 * - decoding: unused
1947 int scenechange_factor;
1951 * Note: Value depends upon the compare function used for fullpel ME.
1952 * - encoding: Set by user.
1953 * - decoding: unused
1958 * Adjust sensitivity of b_frame_strategy 1.
1959 * - encoding: Set by user.
1960 * - decoding: unused
1965 * Chromaticity coordinates of the source primaries.
1966 * - encoding: Set by user
1967 * - decoding: Set by libavcodec
1969 enum AVColorPrimaries color_primaries;
1972 * Color Transfer Characteristic.
1973 * - encoding: Set by user
1974 * - decoding: Set by libavcodec
1976 enum AVColorTransferCharacteristic color_trc;
1979 * YUV colorspace type.
1980 * - encoding: Set by user
1981 * - decoding: Set by libavcodec
1983 enum AVColorSpace colorspace;
1986 * MPEG vs JPEG YUV range.
1987 * - encoding: Set by user
1988 * - decoding: Set by libavcodec
1990 enum AVColorRange color_range;
1993 * This defines the location of chroma samples.
1994 * - encoding: Set by user
1995 * - decoding: Set by libavcodec
1997 enum AVChromaLocation chroma_sample_location;
2001 * Indicates number of picture subdivisions. Used for parallelized
2003 * - encoding: Set by user
2004 * - decoding: unused
2009 * - encoding: set by libavcodec
2010 * - decoding: Set by libavcodec
2012 enum AVFieldOrder field_order;
2015 int sample_rate; ///< samples per second
2016 int channels; ///< number of audio channels
2019 * audio sample format
2020 * - encoding: Set by user.
2021 * - decoding: Set by libavcodec.
2023 enum AVSampleFormat sample_fmt; ///< sample format
2025 /* The following data should not be initialized. */
2027 * Samples per packet, initialized when calling 'init'.
2030 int frame_number; ///< audio or video frame number
2033 * number of bytes per packet if constant and known or 0
2034 * Used by some WAV based audio codecs.
2039 * Audio cutoff bandwidth (0 means "automatic")
2040 * - encoding: Set by user.
2041 * - decoding: unused
2045 #if FF_API_REQUEST_CHANNELS
2047 * Decoder should decode to this many channels if it can (0 for default)
2048 * - encoding: unused
2049 * - decoding: Set by user.
2050 * @deprecated Deprecated in favor of request_channel_layout.
2052 int request_channels;
2056 * Audio channel layout.
2057 * - encoding: set by user.
2058 * - decoding: set by user, may be overwritten by libavcodec.
2060 uint64_t channel_layout;
2063 * Request decoder to use this channel layout if it can (0 for default)
2064 * - encoding: unused
2065 * - decoding: Set by user.
2067 uint64_t request_channel_layout;
2070 * Type of service that the audio stream conveys.
2071 * - encoding: Set by user.
2072 * - decoding: Set by libavcodec.
2074 enum AVAudioServiceType audio_service_type;
2077 * desired sample format
2078 * - encoding: Not used.
2079 * - decoding: Set by user.
2080 * Decoder will decode to this format if it can.
2082 enum AVSampleFormat request_sample_fmt;
2085 * Called at the beginning of each frame to get a buffer for it.
2087 * The function will set AVFrame.data[], AVFrame.linesize[].
2088 * AVFrame.extended_data[] must also be set, but it should be the same as
2089 * AVFrame.data[] except for planar audio with more channels than can fit
2090 * in AVFrame.data[]. In that case, AVFrame.data[] shall still contain as
2091 * many data pointers as it can hold.
2093 * if CODEC_CAP_DR1 is not set then get_buffer() must call
2094 * avcodec_default_get_buffer() instead of providing buffers allocated by
2097 * AVFrame.data[] should be 32- or 16-byte-aligned unless the CPU doesn't
2098 * need it. avcodec_default_get_buffer() aligns the output buffer properly,
2099 * but if get_buffer() is overridden then alignment considerations should
2100 * be taken into account.
2102 * @see avcodec_default_get_buffer()
2106 * If pic.reference is set then the frame will be read later by libavcodec.
2107 * avcodec_align_dimensions2() should be used to find the required width and
2108 * height, as they normally need to be rounded up to the next multiple of 16.
2110 * If frame multithreading is used and thread_safe_callbacks is set,
2111 * it may be called from a different thread, but not from more than one at
2112 * once. Does not need to be reentrant.
2114 * @see release_buffer(), reget_buffer()
2115 * @see avcodec_align_dimensions2()
2119 * Decoders request a buffer of a particular size by setting
2120 * AVFrame.nb_samples prior to calling get_buffer(). The decoder may,
2121 * however, utilize only part of the buffer by setting AVFrame.nb_samples
2122 * to a smaller value in the output frame.
2124 * Decoders cannot use the buffer after returning from
2125 * avcodec_decode_audio4(), so they will not call release_buffer(), as it
2126 * is assumed to be released immediately upon return.
2128 * As a convenience, av_samples_get_buffer_size() and
2129 * av_samples_fill_arrays() in libavutil may be used by custom get_buffer()
2130 * functions to find the required data size and to fill data pointers and
2131 * linesize. In AVFrame.linesize, only linesize[0] may be set for audio
2132 * since all planes must be the same size.
2134 * @see av_samples_get_buffer_size(), av_samples_fill_arrays()
2136 * - encoding: unused
2137 * - decoding: Set by libavcodec, user can override.
2139 int (*get_buffer)(struct AVCodecContext *c, AVFrame *pic);
2142 * Called to release buffers which were allocated with get_buffer.
2143 * A released buffer can be reused in get_buffer().
2144 * pic.data[*] must be set to NULL.
2145 * May be called from a different thread if frame multithreading is used,
2146 * but not by more than one thread at once, so does not need to be reentrant.
2147 * - encoding: unused
2148 * - decoding: Set by libavcodec, user can override.
2150 void (*release_buffer)(struct AVCodecContext *c, AVFrame *pic);
2153 * Called at the beginning of a frame to get cr buffer for it.
2154 * Buffer type (size, hints) must be the same. libavcodec won't check it.
2155 * libavcodec will pass previous buffer in pic, function should return
2156 * same buffer or new buffer with old frame "painted" into it.
2157 * If pic.data[0] == NULL must behave like get_buffer().
2158 * if CODEC_CAP_DR1 is not set then reget_buffer() must call
2159 * avcodec_default_reget_buffer() instead of providing buffers allocated by
2161 * - encoding: unused
2162 * - decoding: Set by libavcodec, user can override.
2164 int (*reget_buffer)(struct AVCodecContext *c, AVFrame *pic);
2167 /* - encoding parameters */
2168 float qcompress; ///< amount of qscale change between easy & hard scenes (0.0-1.0)
2169 float qblur; ///< amount of qscale smoothing over time (0.0-1.0)
2173 * - encoding: Set by user.
2174 * - decoding: unused
2180 * - encoding: Set by user.
2181 * - decoding: unused
2186 * maximum quantizer difference between frames
2187 * - encoding: Set by user.
2188 * - decoding: unused
2193 * ratecontrol qmin qmax limiting method
2194 * 0-> clipping, 1-> use a nice continous function to limit qscale wthin qmin/qmax.
2195 * - encoding: Set by user.
2196 * - decoding: unused
2204 * decoder bitstream buffer size
2205 * - encoding: Set by user.
2206 * - decoding: unused
2211 * ratecontrol override, see RcOverride
2212 * - encoding: Allocated/set/freed by user.
2213 * - decoding: unused
2215 int rc_override_count;
2216 RcOverride *rc_override;
2219 * rate control equation
2220 * - encoding: Set by user
2221 * - decoding: unused
2227 * - encoding: Set by user.
2228 * - decoding: unused
2234 * - encoding: Set by user.
2235 * - decoding: unused
2239 float rc_buffer_aggressivity;
2242 * initial complexity for pass1 ratecontrol
2243 * - encoding: Set by user.
2244 * - decoding: unused
2246 float rc_initial_cplx;
2249 * Ratecontrol attempt to use, at maximum, <value> of what can be used without an underflow.
2250 * - encoding: Set by user.
2251 * - decoding: unused.
2253 float rc_max_available_vbv_use;
2256 * Ratecontrol attempt to use, at least, <value> times the amount needed to prevent a vbv overflow.
2257 * - encoding: Set by user.
2258 * - decoding: unused.
2260 float rc_min_vbv_overflow_use;
2263 * Number of bits which should be loaded into the rc buffer before decoding starts.
2264 * - encoding: Set by user.
2265 * - decoding: unused
2267 int rc_initial_buffer_occupancy;
2269 #define FF_CODER_TYPE_VLC 0
2270 #define FF_CODER_TYPE_AC 1
2271 #define FF_CODER_TYPE_RAW 2
2272 #define FF_CODER_TYPE_RLE 3
2273 #define FF_CODER_TYPE_DEFLATE 4
2276 * - encoding: Set by user.
2277 * - decoding: unused
2283 * - encoding: Set by user.
2284 * - decoding: unused
2289 * minimum Lagrange multipler
2290 * - encoding: Set by user.
2291 * - decoding: unused
2296 * maximum Lagrange multipler
2297 * - encoding: Set by user.
2298 * - decoding: unused
2303 * frame skip threshold
2304 * - encoding: Set by user.
2305 * - decoding: unused
2307 int frame_skip_threshold;
2311 * - encoding: Set by user.
2312 * - decoding: unused
2314 int frame_skip_factor;
2317 * frame skip exponent
2318 * - encoding: Set by user.
2319 * - decoding: unused
2324 * frame skip comparison function
2325 * - encoding: Set by user.
2326 * - decoding: unused
2331 * trellis RD quantization
2332 * - encoding: Set by user.
2333 * - decoding: unused
2338 * - encoding: Set by user.
2339 * - decoding: unused
2341 int min_prediction_order;
2344 * - encoding: Set by user.
2345 * - decoding: unused
2347 int max_prediction_order;
2350 * GOP timecode frame start number
2351 * - encoding: Set by user, in non drop frame format
2352 * - decoding: Set by libavcodec (timecode in the 25 bits format, -1 if unset)
2354 int64_t timecode_frame_start;
2356 /* The RTP callback: This function is called */
2357 /* every time the encoder has a packet to send. */
2358 /* It depends on the encoder if the data starts */
2359 /* with a Start Code (it should). H.263 does. */
2360 /* mb_nb contains the number of macroblocks */
2361 /* encoded in the RTP payload. */
2362 void (*rtp_callback)(struct AVCodecContext *avctx, void *data, int size, int mb_nb);
2364 int rtp_payload_size; /* The size of the RTP payload: the coder will */
2365 /* do its best to deliver a chunk with size */
2366 /* below rtp_payload_size, the chunk will start */
2367 /* with a start code on some codecs like H.263. */
2368 /* This doesn't take account of any particular */
2369 /* headers inside the transmitted RTP payload. */
2371 /* statistics, used for 2-pass encoding */
2382 * number of bits used for the previously encoded frame
2383 * - encoding: Set by libavcodec.
2384 * - decoding: unused
2389 * pass1 encoding statistics output buffer
2390 * - encoding: Set by libavcodec.
2391 * - decoding: unused
2396 * pass2 encoding statistics input buffer
2397 * Concatenated stuff from stats_out of pass1 should be placed here.
2398 * - encoding: Allocated/set/freed by user.
2399 * - decoding: unused
2404 * Work around bugs in encoders which sometimes cannot be detected automatically.
2405 * - encoding: Set by user
2406 * - decoding: Set by user
2408 int workaround_bugs;
2409 #define FF_BUG_AUTODETECT 1 ///< autodetection
2410 #define FF_BUG_OLD_MSMPEG4 2
2411 #define FF_BUG_XVID_ILACE 4
2412 #define FF_BUG_UMP4 8
2413 #define FF_BUG_NO_PADDING 16
2414 #define FF_BUG_AMV 32
2415 #define FF_BUG_AC_VLC 0 ///< Will be removed, libavcodec can now handle these non-compliant files by default.
2416 #define FF_BUG_QPEL_CHROMA 64
2417 #define FF_BUG_STD_QPEL 128
2418 #define FF_BUG_QPEL_CHROMA2 256
2419 #define FF_BUG_DIRECT_BLOCKSIZE 512
2420 #define FF_BUG_EDGE 1024
2421 #define FF_BUG_HPEL_CHROMA 2048
2422 #define FF_BUG_DC_CLIP 4096
2423 #define FF_BUG_MS 8192 ///< Work around various bugs in Microsoft's broken decoders.
2424 #define FF_BUG_TRUNCATED 16384
2427 * strictly follow the standard (MPEG4, ...).
2428 * - encoding: Set by user.
2429 * - decoding: Set by user.
2430 * Setting this to STRICT or higher means the encoder and decoder will
2431 * generally do stupid things, whereas setting it to unofficial or lower
2432 * will mean the encoder might produce output that is not supported by all
2433 * spec-compliant decoders. Decoders don't differentiate between normal,
2434 * unofficial and experimental (that is, they always try to decode things
2435 * when they can) unless they are explicitly asked to behave stupidly
2436 * (=strictly conform to the specs)
2438 int strict_std_compliance;
2439 #define FF_COMPLIANCE_VERY_STRICT 2 ///< Strictly conform to an older more strict version of the spec or reference software.
2440 #define FF_COMPLIANCE_STRICT 1 ///< Strictly conform to all the things in the spec no matter what consequences.
2441 #define FF_COMPLIANCE_NORMAL 0
2442 #define FF_COMPLIANCE_UNOFFICIAL -1 ///< Allow unofficial extensions
2443 #define FF_COMPLIANCE_EXPERIMENTAL -2 ///< Allow nonstandardized experimental things.
2446 * error concealment flags
2447 * - encoding: unused
2448 * - decoding: Set by user.
2450 int error_concealment;
2451 #define FF_EC_GUESS_MVS 1
2452 #define FF_EC_DEBLOCK 2
2456 * - encoding: Set by user.
2457 * - decoding: Set by user.
2460 #define FF_DEBUG_PICT_INFO 1
2461 #define FF_DEBUG_RC 2
2462 #define FF_DEBUG_BITSTREAM 4
2463 #define FF_DEBUG_MB_TYPE 8
2464 #define FF_DEBUG_QP 16
2465 #define FF_DEBUG_MV 32
2466 #define FF_DEBUG_DCT_COEFF 0x00000040
2467 #define FF_DEBUG_SKIP 0x00000080
2468 #define FF_DEBUG_STARTCODE 0x00000100
2469 #define FF_DEBUG_PTS 0x00000200
2470 #define FF_DEBUG_ER 0x00000400
2471 #define FF_DEBUG_MMCO 0x00000800
2472 #define FF_DEBUG_BUGS 0x00001000
2473 #define FF_DEBUG_VIS_QP 0x00002000
2474 #define FF_DEBUG_VIS_MB_TYPE 0x00004000
2475 #define FF_DEBUG_BUFFERS 0x00008000
2476 #define FF_DEBUG_THREADS 0x00010000
2480 * - encoding: Set by user.
2481 * - decoding: Set by user.
2484 #define FF_DEBUG_VIS_MV_P_FOR 0x00000001 //visualize forward predicted MVs of P frames
2485 #define FF_DEBUG_VIS_MV_B_FOR 0x00000002 //visualize forward predicted MVs of B frames
2486 #define FF_DEBUG_VIS_MV_B_BACK 0x00000004 //visualize backward predicted MVs of B frames
2489 * Error recognition; may misdetect some more or less valid parts as errors.
2490 * - encoding: unused
2491 * - decoding: Set by user.
2493 int err_recognition;
2494 #define AV_EF_CRCCHECK (1<<0)
2495 #define AV_EF_BITSTREAM (1<<1)
2496 #define AV_EF_BUFFER (1<<2)
2497 #define AV_EF_EXPLODE (1<<3)
2499 #define AV_EF_CAREFUL (1<<16)
2500 #define AV_EF_COMPLIANT (1<<17)
2501 #define AV_EF_AGGRESSIVE (1<<18)
2505 * opaque 64bit number (generally a PTS) that will be reordered and
2506 * output in AVFrame.reordered_opaque
2507 * @deprecated in favor of pkt_pts
2508 * - encoding: unused
2509 * - decoding: Set by user.
2511 int64_t reordered_opaque;
2514 * Hardware accelerator in use
2515 * - encoding: unused.
2516 * - decoding: Set by libavcodec
2518 struct AVHWAccel *hwaccel;
2521 * Hardware accelerator context.
2522 * For some hardware accelerators, a global context needs to be
2523 * provided by the user. In that case, this holds display-dependent
2524 * data FFmpeg cannot instantiate itself. Please refer to the
2525 * FFmpeg HW accelerator documentation to know how to fill this
2526 * is. e.g. for VA API, this is a struct vaapi_context.
2527 * - encoding: unused
2528 * - decoding: Set by user
2530 void *hwaccel_context;
2534 * - encoding: Set by libavcodec if flags&CODEC_FLAG_PSNR.
2535 * - decoding: unused
2537 uint64_t error[AV_NUM_DATA_POINTERS];
2540 * DCT algorithm, see FF_DCT_* below
2541 * - encoding: Set by user.
2542 * - decoding: unused
2545 #define FF_DCT_AUTO 0
2546 #define FF_DCT_FASTINT 1
2547 #define FF_DCT_INT 2
2548 #define FF_DCT_MMX 3
2549 #define FF_DCT_ALTIVEC 5
2550 #define FF_DCT_FAAN 6
2553 * IDCT algorithm, see FF_IDCT_* below.
2554 * - encoding: Set by user.
2555 * - decoding: Set by user.
2558 #define FF_IDCT_AUTO 0
2559 #define FF_IDCT_INT 1
2560 #define FF_IDCT_SIMPLE 2
2561 #define FF_IDCT_SIMPLEMMX 3
2562 #define FF_IDCT_LIBMPEG2MMX 4
2563 #define FF_IDCT_MMI 5
2564 #define FF_IDCT_ARM 7
2565 #define FF_IDCT_ALTIVEC 8
2566 #define FF_IDCT_SH4 9
2567 #define FF_IDCT_SIMPLEARM 10
2568 #define FF_IDCT_H264 11
2569 #define FF_IDCT_VP3 12
2570 #define FF_IDCT_IPP 13
2571 #define FF_IDCT_XVIDMMX 14
2572 #define FF_IDCT_CAVS 15
2573 #define FF_IDCT_SIMPLEARMV5TE 16
2574 #define FF_IDCT_SIMPLEARMV6 17
2575 #define FF_IDCT_SIMPLEVIS 18
2576 #define FF_IDCT_WMV2 19
2577 #define FF_IDCT_FAAN 20
2578 #define FF_IDCT_EA 21
2579 #define FF_IDCT_SIMPLENEON 22
2580 #define FF_IDCT_SIMPLEALPHA 23
2581 #define FF_IDCT_BINK 24
2584 * dsp_mask could be add used to disable unwanted CPU features
2585 * CPU features (i.e. MMX, SSE. ...)
2587 * With the FORCE flag you may instead enable given CPU features.
2588 * (Dangerous: Usable in case of misdetection, improper usage however will
2589 * result into program crash.)
2594 * bits per sample/pixel from the demuxer (needed for huffyuv).
2595 * - encoding: Set by libavcodec.
2596 * - decoding: Set by user.
2598 int bits_per_coded_sample;
2601 * Bits per sample/pixel of internal libavcodec pixel/sample format.
2602 * - encoding: set by user.
2603 * - decoding: set by libavcodec.
2605 int bits_per_raw_sample;
2608 * low resolution decoding, 1-> 1/2 size, 2->1/4 size
2609 * - encoding: unused
2610 * - decoding: Set by user.
2615 * the picture in the bitstream
2616 * - encoding: Set by libavcodec.
2617 * - decoding: Set by libavcodec.
2619 AVFrame *coded_frame;
2623 * is used to decide how many independent tasks should be passed to execute()
2624 * - encoding: Set by user.
2625 * - decoding: Set by user.
2630 * Which multithreading methods to use.
2631 * Use of FF_THREAD_FRAME will increase decoding delay by one frame per thread,
2632 * so clients which cannot provide future frames should not use it.
2634 * - encoding: Set by user, otherwise the default is used.
2635 * - decoding: Set by user, otherwise the default is used.
2638 #define FF_THREAD_FRAME 1 ///< Decode more than one frame at once
2639 #define FF_THREAD_SLICE 2 ///< Decode more than one part of a single frame at once
2642 * Which multithreading methods are in use by the codec.
2643 * - encoding: Set by libavcodec.
2644 * - decoding: Set by libavcodec.
2646 int active_thread_type;
2649 * Set by the client if its custom get_buffer() callback can be called
2650 * from another thread, which allows faster multithreaded decoding.
2651 * draw_horiz_band() will be called from other threads regardless of this setting.
2652 * Ignored if the default get_buffer() is used.
2653 * - encoding: Set by user.
2654 * - decoding: Set by user.
2656 int thread_safe_callbacks;
2659 * The codec may call this to execute several independent things.
2660 * It will return only after finishing all tasks.
2661 * The user may replace this with some multithreaded implementation,
2662 * the default implementation will execute the parts serially.
2663 * @param count the number of things to execute
2664 * - encoding: Set by libavcodec, user can override.
2665 * - decoding: Set by libavcodec, user can override.
2667 int (*execute)(struct AVCodecContext *c, int (*func)(struct AVCodecContext *c2, void *arg), void *arg2, int *ret, int count, int size);
2670 * The codec may call this to execute several independent things.
2671 * It will return only after finishing all tasks.
2672 * The user may replace this with some multithreaded implementation,
2673 * the default implementation will execute the parts serially.
2674 * Also see avcodec_thread_init and e.g. the --enable-pthread configure option.
2675 * @param c context passed also to func
2676 * @param count the number of things to execute
2677 * @param arg2 argument passed unchanged to func
2678 * @param ret return values of executed functions, must have space for "count" values. May be NULL.
2679 * @param func function that will be called count times, with jobnr from 0 to count-1.
2680 * threadnr will be in the range 0 to c->thread_count-1 < MAX_THREADS and so that no
2681 * two instances of func executing at the same time will have the same threadnr.
2682 * @return always 0 currently, but code should handle a future improvement where when any call to func
2683 * returns < 0 no further calls to func may be done and < 0 is returned.
2684 * - encoding: Set by libavcodec, user can override.
2685 * - decoding: Set by libavcodec, user can override.
2687 int (*execute2)(struct AVCodecContext *c, int (*func)(struct AVCodecContext *c2, void *arg, int jobnr, int threadnr), void *arg2, int *ret, int count);
2691 * Can be used by execute() to store some per AVCodecContext stuff.
2692 * - encoding: set by execute()
2693 * - decoding: set by execute()
2695 void *thread_opaque;
2698 * noise vs. sse weight for the nsse comparsion function
2699 * - encoding: Set by user.
2700 * - decoding: unused
2706 * - encoding: Set by user.
2707 * - decoding: Set by libavcodec.
2710 #define FF_PROFILE_UNKNOWN -99
2711 #define FF_PROFILE_RESERVED -100
2713 #define FF_PROFILE_AAC_MAIN 0
2714 #define FF_PROFILE_AAC_LOW 1
2715 #define FF_PROFILE_AAC_SSR 2
2716 #define FF_PROFILE_AAC_LTP 3
2718 #define FF_PROFILE_DTS 20
2719 #define FF_PROFILE_DTS_ES 30
2720 #define FF_PROFILE_DTS_96_24 40
2721 #define FF_PROFILE_DTS_HD_HRA 50
2722 #define FF_PROFILE_DTS_HD_MA 60
2724 #define FF_PROFILE_MPEG2_422 0
2725 #define FF_PROFILE_MPEG2_HIGH 1
2726 #define FF_PROFILE_MPEG2_SS 2
2727 #define FF_PROFILE_MPEG2_SNR_SCALABLE 3
2728 #define FF_PROFILE_MPEG2_MAIN 4
2729 #define FF_PROFILE_MPEG2_SIMPLE 5
2731 #define FF_PROFILE_H264_CONSTRAINED (1<<9) // 8+1; constraint_set1_flag
2732 #define FF_PROFILE_H264_INTRA (1<<11) // 8+3; constraint_set3_flag
2734 #define FF_PROFILE_H264_BASELINE 66
2735 #define FF_PROFILE_H264_CONSTRAINED_BASELINE (66|FF_PROFILE_H264_CONSTRAINED)
2736 #define FF_PROFILE_H264_MAIN 77
2737 #define FF_PROFILE_H264_EXTENDED 88
2738 #define FF_PROFILE_H264_HIGH 100
2739 #define FF_PROFILE_H264_HIGH_10 110
2740 #define FF_PROFILE_H264_HIGH_10_INTRA (110|FF_PROFILE_H264_INTRA)
2741 #define FF_PROFILE_H264_HIGH_422 122
2742 #define FF_PROFILE_H264_HIGH_422_INTRA (122|FF_PROFILE_H264_INTRA)
2743 #define FF_PROFILE_H264_HIGH_444 144
2744 #define FF_PROFILE_H264_HIGH_444_PREDICTIVE 244
2745 #define FF_PROFILE_H264_HIGH_444_INTRA (244|FF_PROFILE_H264_INTRA)
2746 #define FF_PROFILE_H264_CAVLC_444 44
2748 #define FF_PROFILE_VC1_SIMPLE 0
2749 #define FF_PROFILE_VC1_MAIN 1
2750 #define FF_PROFILE_VC1_COMPLEX 2
2751 #define FF_PROFILE_VC1_ADVANCED 3
2753 #define FF_PROFILE_MPEG4_SIMPLE 0
2754 #define FF_PROFILE_MPEG4_SIMPLE_SCALABLE 1
2755 #define FF_PROFILE_MPEG4_CORE 2
2756 #define FF_PROFILE_MPEG4_MAIN 3
2757 #define FF_PROFILE_MPEG4_N_BIT 4
2758 #define FF_PROFILE_MPEG4_SCALABLE_TEXTURE 5
2759 #define FF_PROFILE_MPEG4_SIMPLE_FACE_ANIMATION 6
2760 #define FF_PROFILE_MPEG4_BASIC_ANIMATED_TEXTURE 7
2761 #define FF_PROFILE_MPEG4_HYBRID 8
2762 #define FF_PROFILE_MPEG4_ADVANCED_REAL_TIME 9
2763 #define FF_PROFILE_MPEG4_CORE_SCALABLE 10
2764 #define FF_PROFILE_MPEG4_ADVANCED_CODING 11
2765 #define FF_PROFILE_MPEG4_ADVANCED_CORE 12
2766 #define FF_PROFILE_MPEG4_ADVANCED_SCALABLE_TEXTURE 13
2767 #define FF_PROFILE_MPEG4_SIMPLE_STUDIO 14
2768 #define FF_PROFILE_MPEG4_ADVANCED_SIMPLE 15
2772 * - encoding: Set by user.
2773 * - decoding: Set by libavcodec.
2776 #define FF_LEVEL_UNKNOWN -99
2780 * - encoding: unused
2781 * - decoding: Set by user.
2783 enum AVDiscard skip_loop_filter;
2787 * - encoding: unused
2788 * - decoding: Set by user.
2790 enum AVDiscard skip_idct;
2794 * - encoding: unused
2795 * - decoding: Set by user.
2797 enum AVDiscard skip_frame;
2800 * Header containing style information for text subtitles.
2801 * For SUBTITLE_ASS subtitle type, it should contain the whole ASS
2802 * [Script Info] and [V4+ Styles] section, plus the [Events] line and
2803 * the Format line following. It shouldn't include any Dialogue line.
2804 * - encoding: Set/allocated/freed by user (before avcodec_open2())
2805 * - decoding: Set/allocated/freed by libavcodec (by avcodec_open2())
2807 uint8_t *subtitle_header;
2808 int subtitle_header_size;
2811 * Simulates errors in the bitstream to test error concealment.
2812 * - encoding: Set by user.
2813 * - decoding: unused
2818 * Current packet as passed into the decoder, to avoid having
2819 * to pass the packet into every function. Currently only valid
2820 * inside lavc and get/release_buffer callbacks.
2821 * - decoding: set by avcodec_decode_*, read by get_buffer() for setting pkt_pts
2822 * - encoding: unused
2827 * VBV delay coded in the last frame (in periods of a 27 MHz clock).
2828 * Used for compliant TS muxing.
2829 * - encoding: Set by libavcodec.
2830 * - decoding: unused.
2835 * Current statistics for PTS correction.
2836 * - decoding: maintained and used by libavcodec, not intended to be used by user apps
2837 * - encoding: unused
2839 int64_t pts_correction_num_faulty_pts; /// Number of incorrect PTS values so far
2840 int64_t pts_correction_num_faulty_dts; /// Number of incorrect DTS values so far
2841 int64_t pts_correction_last_pts; /// PTS of the last frame
2842 int64_t pts_correction_last_dts; /// DTS of the last frame
2848 typedef struct AVProfile {
2850 const char *name; ///< short name for the profile
2853 typedef struct AVCodecDefault AVCodecDefault;
2858 typedef struct AVCodec {
2860 * Name of the codec implementation.
2861 * The name is globally unique among encoders and among decoders (but an
2862 * encoder and a decoder can share the same name).
2863 * This is the primary way to find a codec from the user perspective.
2867 * Descriptive name for the codec, meant to be more human readable than name.
2868 * You should use the NULL_IF_CONFIG_SMALL() macro to define it.
2870 const char *long_name;
2871 enum AVMediaType type;
2874 * Codec capabilities.
2878 const AVRational *supported_framerates; ///< array of supported framerates, or NULL if any, array is terminated by {0,0}
2879 const enum PixelFormat *pix_fmts; ///< array of supported pixel formats, or NULL if unknown, array is terminated by -1
2880 const int *supported_samplerates; ///< array of supported audio samplerates, or NULL if unknown, array is terminated by 0
2881 const enum AVSampleFormat *sample_fmts; ///< array of supported sample formats, or NULL if unknown, array is terminated by -1
2882 const uint64_t *channel_layouts; ///< array of support channel layouts, or NULL if unknown. array is terminated by 0
2883 uint8_t max_lowres; ///< maximum value for lowres supported by the decoder
2884 const AVClass *priv_class; ///< AVClass for the private context
2885 const AVProfile *profiles; ///< array of recognized profiles, or NULL if unknown, array is terminated by {FF_PROFILE_UNKNOWN}
2887 /*****************************************************************
2888 * No fields below this line are part of the public API. They
2889 * may not be used outside of libavcodec and can be changed and
2891 * New public fields should be added right above.
2892 *****************************************************************
2895 struct AVCodec *next;
2897 * @name Frame-level threading support functions
2901 * If defined, called on thread contexts when they are created.
2902 * If the codec allocates writable tables in init(), re-allocate them here.
2903 * priv_data will be set to a copy of the original.
2905 int (*init_thread_copy)(AVCodecContext *);
2907 * Copy necessary context variables from a previous thread context to the current one.
2908 * If not defined, the next thread will start automatically; otherwise, the codec
2909 * must call ff_thread_finish_setup().
2911 * dst and src will (rarely) point to the same context, in which case memcpy should be skipped.
2913 int (*update_thread_context)(AVCodecContext *dst, const AVCodecContext *src);
2917 * Private codec-specific defaults.
2919 const AVCodecDefault *defaults;
2922 * Initialize codec static data, called from avcodec_register().
2924 void (*init_static_data)(struct AVCodec *codec);
2926 int (*init)(AVCodecContext *);
2927 int (*encode)(AVCodecContext *, uint8_t *buf, int buf_size, void *data);
2929 * Encode data to an AVPacket.
2931 * @param avctx codec context
2932 * @param avpkt output AVPacket (may contain a user-provided buffer)
2933 * @param[in] frame AVFrame containing the raw data to be encoded
2934 * @param[out] got_packet_ptr encoder sets to 0 or 1 to indicate that a
2935 * non-empty packet was returned in avpkt.
2936 * @return 0 on success, negative error code on failure
2938 int (*encode2)(AVCodecContext *avctx, AVPacket *avpkt, const AVFrame *frame,
2939 int *got_packet_ptr);
2940 int (*decode)(AVCodecContext *, void *outdata, int *outdata_size, AVPacket *avpkt);
2941 int (*close)(AVCodecContext *);
2944 * Will be called when seeking
2946 void (*flush)(AVCodecContext *);
2952 typedef struct AVHWAccel {
2954 * Name of the hardware accelerated codec.
2955 * The name is globally unique among encoders and among decoders (but an
2956 * encoder and a decoder can share the same name).
2961 * Type of codec implemented by the hardware accelerator.
2963 * See AVMEDIA_TYPE_xxx
2965 enum AVMediaType type;
2968 * Codec implemented by the hardware accelerator.
2975 * Supported pixel format.
2977 * Only hardware accelerated formats are supported here.
2979 enum PixelFormat pix_fmt;
2982 * Hardware accelerated codec capabilities.
2983 * see FF_HWACCEL_CODEC_CAP_*
2987 struct AVHWAccel *next;
2990 * Called at the beginning of each frame or field picture.
2992 * Meaningful frame information (codec specific) is guaranteed to
2993 * be parsed at this point. This function is mandatory.
2995 * Note that buf can be NULL along with buf_size set to 0.
2996 * Otherwise, this means the whole frame is available at this point.
2998 * @param avctx the codec context
2999 * @param buf the frame data buffer base
3000 * @param buf_size the size of the frame in bytes
3001 * @return zero if successful, a negative value otherwise
3003 int (*start_frame)(AVCodecContext *avctx, const uint8_t *buf, uint32_t buf_size);
3006 * Callback for each slice.
3008 * Meaningful slice information (codec specific) is guaranteed to
3009 * be parsed at this point. This function is mandatory.
3011 * @param avctx the codec context
3012 * @param buf the slice data buffer base
3013 * @param buf_size the size of the slice in bytes
3014 * @return zero if successful, a negative value otherwise
3016 int (*decode_slice)(AVCodecContext *avctx, const uint8_t *buf, uint32_t buf_size);
3019 * Called at the end of each frame or field picture.
3021 * The whole picture is parsed at this point and can now be sent
3022 * to the hardware accelerator. This function is mandatory.
3024 * @param avctx the codec context
3025 * @return zero if successful, a negative value otherwise
3027 int (*end_frame)(AVCodecContext *avctx);
3030 * Size of HW accelerator private data.
3032 * Private data is allocated with av_mallocz() before
3033 * AVCodecContext.get_buffer() and deallocated after
3034 * AVCodecContext.release_buffer().
3040 * four components are given, that's all.
3041 * the last component is alpha
3043 typedef struct AVPicture {
3044 uint8_t *data[AV_NUM_DATA_POINTERS];
3045 int linesize[AV_NUM_DATA_POINTERS]; ///< number of bytes per line
3048 #define AVPALETTE_SIZE 1024
3049 #define AVPALETTE_COUNT 256
3051 enum AVSubtitleType {
3054 SUBTITLE_BITMAP, ///< A bitmap, pict will be set
3057 * Plain text, the text field must be set by the decoder and is
3058 * authoritative. ass and pict fields may contain approximations.
3063 * Formatted text, the ass field must be set by the decoder and is
3064 * authoritative. pict and text fields may contain approximations.
3069 typedef struct AVSubtitleRect {
3070 int x; ///< top left corner of pict, undefined when pict is not set
3071 int y; ///< top left corner of pict, undefined when pict is not set
3072 int w; ///< width of pict, undefined when pict is not set
3073 int h; ///< height of pict, undefined when pict is not set
3074 int nb_colors; ///< number of colors in pict, undefined when pict is not set
3077 * data+linesize for the bitmap of this subtitle.
3078 * can be set for text/ass as well once they where rendered
3081 enum AVSubtitleType type;
3083 char *text; ///< 0 terminated plain UTF-8 text
3086 * 0 terminated ASS/SSA compatible event line.
3087 * The pressentation of this is unaffected by the other values in this
3093 typedef struct AVSubtitle {
3094 uint16_t format; /* 0 = graphics */
3095 uint32_t start_display_time; /* relative to packet pts, in ms */
3096 uint32_t end_display_time; /* relative to packet pts, in ms */
3098 AVSubtitleRect **rects;
3099 int64_t pts; ///< Same as packet pts, in AV_TIME_BASE
3102 /* packet functions */
3105 * @deprecated use NULL instead
3107 attribute_deprecated void av_destruct_packet_nofree(AVPacket *pkt);
3110 * Default packet destructor.
3112 void av_destruct_packet(AVPacket *pkt);
3115 * Initialize optional fields of a packet with default values.
3119 void av_init_packet(AVPacket *pkt);
3122 * Allocate the payload of a packet and initialize its fields with
3126 * @param size wanted payload size
3127 * @return 0 if OK, AVERROR_xxx otherwise
3129 int av_new_packet(AVPacket *pkt, int size);
3132 * Reduce packet size, correctly zeroing padding
3135 * @param size new size
3137 void av_shrink_packet(AVPacket *pkt, int size);
3140 * Increase packet size, correctly zeroing padding
3143 * @param grow_by number of bytes by which to increase the size of the packet
3145 int av_grow_packet(AVPacket *pkt, int grow_by);
3148 * @warning This is a hack - the packet memory allocation stuff is broken. The
3149 * packet is allocated if it was not really allocated.
3151 int av_dup_packet(AVPacket *pkt);
3156 * @param pkt packet to free
3158 void av_free_packet(AVPacket *pkt);
3161 * Allocate new information of a packet.
3164 * @param type side information type
3165 * @param size side information size
3166 * @return pointer to fresh allocated data or NULL otherwise
3168 uint8_t* av_packet_new_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
3172 * Shrink the already allocated side data buffer
3175 * @param type side information type
3176 * @param size new side information size
3177 * @return 0 on success, < 0 on failure
3179 int av_packet_shrink_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
3183 * Get side information from packet.
3186 * @param type desired side information type
3187 * @param size pointer for side information size to store (optional)
3188 * @return pointer to data if present or NULL otherwise
3190 uint8_t* av_packet_get_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
3193 int av_packet_merge_side_data(AVPacket *pkt);
3195 int av_packet_split_side_data(AVPacket *pkt);
3200 struct ReSampleContext;
3201 struct AVResampleContext;
3203 typedef struct ReSampleContext ReSampleContext;
3206 * Initialize audio resampling context.
3208 * @param output_channels number of output channels
3209 * @param input_channels number of input channels
3210 * @param output_rate output sample rate
3211 * @param input_rate input sample rate
3212 * @param sample_fmt_out requested output sample format
3213 * @param sample_fmt_in input sample format
3214 * @param filter_length length of each FIR filter in the filterbank relative to the cutoff frequency
3215 * @param log2_phase_count log2 of the number of entries in the polyphase filterbank
3216 * @param linear if 1 then the used FIR filter will be linearly interpolated
3217 between the 2 closest, if 0 the closest will be used
3218 * @param cutoff cutoff frequency, 1.0 corresponds to half the output sampling rate
3219 * @return allocated ReSampleContext, NULL if error occurred
3221 ReSampleContext *av_audio_resample_init(int output_channels, int input_channels,
3222 int output_rate, int input_rate,
3223 enum AVSampleFormat sample_fmt_out,
3224 enum AVSampleFormat sample_fmt_in,
3225 int filter_length, int log2_phase_count,
3226 int linear, double cutoff);
3228 int audio_resample(ReSampleContext *s, short *output, short *input, int nb_samples);
3231 * Free resample context.
3233 * @param s a non-NULL pointer to a resample context previously
3234 * created with av_audio_resample_init()
3236 void audio_resample_close(ReSampleContext *s);
3240 * Initialize an audio resampler.
3241 * Note, if either rate is not an integer then simply scale both rates up so they are.
3242 * @param filter_length length of each FIR filter in the filterbank relative to the cutoff freq
3243 * @param log2_phase_count log2 of the number of entries in the polyphase filterbank
3244 * @param linear If 1 then the used FIR filter will be linearly interpolated
3245 between the 2 closest, if 0 the closest will be used
3246 * @param cutoff cutoff frequency, 1.0 corresponds to half the output sampling rate
3248 struct AVResampleContext *av_resample_init(int out_rate, int in_rate, int filter_length, int log2_phase_count, int linear, double cutoff);
3251 * Resample an array of samples using a previously configured context.
3252 * @param src an array of unconsumed samples
3253 * @param consumed the number of samples of src which have been consumed are returned here
3254 * @param src_size the number of unconsumed samples available
3255 * @param dst_size the amount of space in samples available in dst
3256 * @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.
3257 * @return the number of samples written in dst or -1 if an error occurred
3259 int av_resample(struct AVResampleContext *c, short *dst, short *src, int *consumed, int src_size, int dst_size, int update_ctx);
3263 * Compensate samplerate/timestamp drift. The compensation is done by changing
3264 * the resampler parameters, so no audible clicks or similar distortions occur
3265 * @param compensation_distance distance in output samples over which the compensation should be performed
3266 * @param sample_delta number of output samples which should be output less
3268 * example: av_resample_compensate(c, 10, 500)
3269 * here instead of 510 samples only 500 samples would be output
3271 * note, due to rounding the actual compensation might be slightly different,
3272 * especially if the compensation_distance is large and the in_rate used during init is small
3274 void av_resample_compensate(struct AVResampleContext *c, int sample_delta, int compensation_distance);
3275 void av_resample_close(struct AVResampleContext *c);
3278 * Allocate memory for a picture. Call avpicture_free() to free it.
3280 * @see avpicture_fill()
3282 * @param picture the picture to be filled in
3283 * @param pix_fmt the format of the picture
3284 * @param width the width of the picture
3285 * @param height the height of the picture
3286 * @return zero if successful, a negative value if not
3288 int avpicture_alloc(AVPicture *picture, enum PixelFormat pix_fmt, int width, int height);
3291 * Free a picture previously allocated by avpicture_alloc().
3292 * The data buffer used by the AVPicture is freed, but the AVPicture structure
3295 * @param picture the AVPicture to be freed
3297 void avpicture_free(AVPicture *picture);
3300 * Fill in the AVPicture fields.
3301 * The fields of the given AVPicture are filled in by using the 'ptr' address
3302 * which points to the image data buffer. Depending on the specified picture
3303 * format, one or multiple image data pointers and line sizes will be set.
3304 * If a planar format is specified, several pointers will be set pointing to
3305 * the different picture planes and the line sizes of the different planes
3306 * will be stored in the lines_sizes array.
3307 * Call with ptr == NULL to get the required size for the ptr buffer.
3309 * To allocate the buffer and fill in the AVPicture fields in one call,
3310 * use avpicture_alloc().
3312 * @param picture AVPicture whose fields are to be filled in
3313 * @param ptr Buffer which will contain or contains the actual image data
3314 * @param pix_fmt The format in which the picture data is stored.
3315 * @param width the width of the image in pixels
3316 * @param height the height of the image in pixels
3317 * @return size of the image data in bytes
3319 int avpicture_fill(AVPicture *picture, uint8_t *ptr,
3320 enum PixelFormat pix_fmt, int width, int height);
3323 * Copy pixel data from an AVPicture into a buffer.
3324 * The data is stored compactly, without any gaps for alignment or padding
3325 * which may be applied by avpicture_fill().
3327 * @see avpicture_get_size()
3329 * @param[in] src AVPicture containing image data
3330 * @param[in] pix_fmt The format in which the picture data is stored.
3331 * @param[in] width the width of the image in pixels.
3332 * @param[in] height the height of the image in pixels.
3333 * @param[out] dest A buffer into which picture data will be copied.
3334 * @param[in] dest_size The size of 'dest'.
3335 * @return The number of bytes written to dest, or a negative value (error code) on error.
3337 int avpicture_layout(const AVPicture* src, enum PixelFormat pix_fmt, int width, int height,
3338 unsigned char *dest, int dest_size);
3341 * Calculate the size in bytes that a picture of the given width and height
3342 * would occupy if stored in the given picture format.
3343 * Note that this returns the size of a compact representation as generated
3344 * by avpicture_layout(), which can be smaller than the size required for e.g.
3347 * @param pix_fmt the given picture format
3348 * @param width the width of the image
3349 * @param height the height of the image
3350 * @return Image data size in bytes or -1 on error (e.g. too large dimensions).
3352 int avpicture_get_size(enum PixelFormat pix_fmt, int width, int height);
3353 void avcodec_get_chroma_sub_sample(enum PixelFormat pix_fmt, int *h_shift, int *v_shift);
3356 * Get the name of a codec.
3357 * @return a static string identifying the codec; never NULL
3359 const char *avcodec_get_name(enum CodecID id);
3361 void avcodec_set_dimensions(AVCodecContext *s, int width, int height);
3364 * Return a value representing the fourCC code associated to the
3365 * pixel format pix_fmt, or 0 if no associated fourCC code can be
3368 unsigned int avcodec_pix_fmt_to_codec_tag(enum PixelFormat pix_fmt);
3371 * Put a string representing the codec tag codec_tag in buf.
3373 * @param buf_size size in bytes of buf
3374 * @return the length of the string that would have been generated if
3375 * enough space had been available, excluding the trailing null
3377 size_t av_get_codec_tag_string(char *buf, size_t buf_size, unsigned int codec_tag);
3379 #define FF_LOSS_RESOLUTION 0x0001 /**< loss due to resolution change */
3380 #define FF_LOSS_DEPTH 0x0002 /**< loss due to color depth change */
3381 #define FF_LOSS_COLORSPACE 0x0004 /**< loss due to color space conversion */
3382 #define FF_LOSS_ALPHA 0x0008 /**< loss of alpha bits */
3383 #define FF_LOSS_COLORQUANT 0x0010 /**< loss due to color quantization */
3384 #define FF_LOSS_CHROMA 0x0020 /**< loss of chroma (e.g. RGB to gray conversion) */
3387 * Compute what kind of losses will occur when converting from one specific
3388 * pixel format to another.
3389 * When converting from one pixel format to another, information loss may occur.
3390 * For example, when converting from RGB24 to GRAY, the color information will
3391 * be lost. Similarly, other losses occur when converting from some formats to
3392 * other formats. These losses can involve loss of chroma, but also loss of
3393 * resolution, loss of color depth, loss due to the color space conversion, loss
3394 * of the alpha bits or loss due to color quantization.
3395 * avcodec_get_fix_fmt_loss() informs you about the various types of losses
3396 * which will occur when converting from one pixel format to another.
3398 * @param[in] dst_pix_fmt destination pixel format
3399 * @param[in] src_pix_fmt source pixel format
3400 * @param[in] has_alpha Whether the source pixel format alpha channel is used.
3401 * @return Combination of flags informing you what kind of losses will occur
3402 * (maximum loss for an invalid dst_pix_fmt).
3404 int avcodec_get_pix_fmt_loss(enum PixelFormat dst_pix_fmt, enum PixelFormat src_pix_fmt,
3408 * Find the best pixel format to convert to given a certain source pixel
3409 * format. When converting from one pixel format to another, information loss
3410 * may occur. For example, when converting from RGB24 to GRAY, the color
3411 * information will be lost. Similarly, other losses occur when converting from
3412 * some formats to other formats. avcodec_find_best_pix_fmt() searches which of
3413 * the given pixel formats should be used to suffer the least amount of loss.
3414 * The pixel formats from which it chooses one, are determined by the
3415 * pix_fmt_mask parameter.
3417 * Note, only the first 64 pixel formats will fit in pix_fmt_mask.
3420 * src_pix_fmt = PIX_FMT_YUV420P;
3421 * pix_fmt_mask = (1 << PIX_FMT_YUV422P) | (1 << PIX_FMT_RGB24);
3422 * dst_pix_fmt = avcodec_find_best_pix_fmt(pix_fmt_mask, src_pix_fmt, alpha, &loss);
3425 * @param[in] pix_fmt_mask bitmask determining which pixel format to choose from
3426 * @param[in] src_pix_fmt source pixel format
3427 * @param[in] has_alpha Whether the source pixel format alpha channel is used.
3428 * @param[out] loss_ptr Combination of flags informing you what kind of losses will occur.
3429 * @return The best pixel format to convert to or -1 if none was found.
3431 enum PixelFormat avcodec_find_best_pix_fmt(int64_t pix_fmt_mask, enum PixelFormat src_pix_fmt,
3432 int has_alpha, int *loss_ptr);
3435 * Find the best pixel format to convert to given a certain source pixel
3436 * format and a selection of two destination pixel formats. When converting from
3437 * one pixel format to another, information loss may occur. For example, when converting
3438 * from RGB24 to GRAY, the color information will be lost. Similarly, other losses occur when
3439 * converting from some formats to other formats. avcodec_find_best_pix_fmt2() selects which of
3440 * the given pixel formats should be used to suffer the least amount of loss.
3442 * If one of the destination formats is PIX_FMT_NONE the other pixel format (if valid) will be
3446 * src_pix_fmt = PIX_FMT_YUV420P;
3447 * dst_pix_fmt1= PIX_FMT_RGB24;
3448 * dst_pix_fmt2= PIX_FMT_GRAY8;
3449 * dst_pix_fmt3= PIX_FMT_RGB8;
3450 * loss= FF_LOSS_CHROMA; // don't care about chroma loss, so chroma loss will be ignored.
3451 * dst_pix_fmt = avcodec_find_best_pix_fmt2(dst_pix_fmt1, dst_pix_fmt2, src_pix_fmt, alpha, &loss);
3452 * dst_pix_fmt = avcodec_find_best_pix_fmt2(dst_pix_fmt, dst_pix_fmt3, src_pix_fmt, alpha, &loss);
3455 * @param[in] dst_pix_fmt1 One of the two destination pixel formats to choose from
3456 * @param[in] dst_pix_fmt2 The other of the two destination pixel formats to choose from
3457 * @param[in] src_pix_fmt Source pixel format
3458 * @param[in] has_alpha Whether the source pixel format alpha channel is used.
3459 * @param[in, out] loss_ptr Combination of loss flags. In: selects which of the losses to ignore, i.e.
3460 * NULL or value of zero means we care about all losses. Out: the loss
3461 * that occurs when converting from src to selected dst pixel format.
3462 * @return The best pixel format to convert to or -1 if none was found.
3464 enum PixelFormat avcodec_find_best_pix_fmt2(enum PixelFormat dst_pix_fmt1, enum PixelFormat dst_pix_fmt2,
3465 enum PixelFormat src_pix_fmt, int has_alpha, int *loss_ptr);
3468 /* deinterlace a picture */
3469 /* deinterlace - if not supported return -1 */
3470 int avpicture_deinterlace(AVPicture *dst, const AVPicture *src,
3471 enum PixelFormat pix_fmt, int width, int height);
3473 /* external high level API */
3476 * If c is NULL, returns the first registered codec,
3477 * if c is non-NULL, returns the next registered codec after c,
3478 * or NULL if c is the last one.
3480 AVCodec *av_codec_next(AVCodec *c);
3483 * Return the LIBAVCODEC_VERSION_INT constant.
3485 unsigned avcodec_version(void);
3488 * Return the libavcodec build-time configuration.
3490 const char *avcodec_configuration(void);
3493 * Return the libavcodec license.
3495 const char *avcodec_license(void);
3498 * Register the codec codec and initialize libavcodec.
3500 * @warning either this function or avcodec_register_all() must be called
3501 * before any other libavcodec functions.
3503 * @see avcodec_register_all()
3505 void avcodec_register(AVCodec *codec);
3508 * Find a registered encoder with a matching codec ID.
3510 * @param id CodecID of the requested encoder
3511 * @return An encoder if one was found, NULL otherwise.
3513 AVCodec *avcodec_find_encoder(enum CodecID id);
3516 * Find a registered encoder with the specified name.
3518 * @param name name of the requested encoder
3519 * @return An encoder if one was found, NULL otherwise.
3521 AVCodec *avcodec_find_encoder_by_name(const char *name);
3524 * Find a registered decoder with a matching codec ID.
3526 * @param id CodecID of the requested decoder
3527 * @return A decoder if one was found, NULL otherwise.
3529 AVCodec *avcodec_find_decoder(enum CodecID id);
3532 * Find a registered decoder with the specified name.
3534 * @param name name of the requested decoder
3535 * @return A decoder if one was found, NULL otherwise.
3537 AVCodec *avcodec_find_decoder_by_name(const char *name);
3538 void avcodec_string(char *buf, int buf_size, AVCodecContext *enc, int encode);
3541 * Return a name for the specified profile, if available.
3543 * @param codec the codec that is searched for the given profile
3544 * @param profile the profile value for which a name is requested
3545 * @return A name for the profile if found, NULL otherwise.
3547 const char *av_get_profile_name(const AVCodec *codec, int profile);
3549 #if FF_API_ALLOC_CONTEXT
3551 * Set the fields of the given AVCodecContext to default values.
3553 * @param s The AVCodecContext of which the fields should be set to default values.
3554 * @deprecated use avcodec_get_context_defaults3
3556 attribute_deprecated
3557 void avcodec_get_context_defaults(AVCodecContext *s);
3559 /** THIS FUNCTION IS NOT YET PART OF THE PUBLIC API!
3560 * we WILL change its arguments and name a few times! */
3561 attribute_deprecated
3562 void avcodec_get_context_defaults2(AVCodecContext *s, enum AVMediaType);
3566 * Set the fields of the given AVCodecContext to default values corresponding
3567 * to the given codec (defaults may be codec-dependent).
3569 * Do not call this function if a non-NULL codec has been passed
3570 * to avcodec_alloc_context3() that allocated this AVCodecContext.
3571 * If codec is non-NULL, it is illegal to call avcodec_open2() with a
3572 * different codec on this AVCodecContext.
3574 int avcodec_get_context_defaults3(AVCodecContext *s, AVCodec *codec);
3576 #if FF_API_ALLOC_CONTEXT
3578 * Allocate an AVCodecContext and set its fields to default values. The
3579 * resulting struct can be deallocated by simply calling av_free().
3581 * @return An AVCodecContext filled with default values or NULL on failure.
3582 * @see avcodec_get_context_defaults
3584 * @deprecated use avcodec_alloc_context3()
3586 attribute_deprecated
3587 AVCodecContext *avcodec_alloc_context(void);
3589 /** THIS FUNCTION IS NOT YET PART OF THE PUBLIC API!
3590 * we WILL change its arguments and name a few times! */
3591 attribute_deprecated
3592 AVCodecContext *avcodec_alloc_context2(enum AVMediaType);
3596 * Allocate an AVCodecContext and set its fields to default values. The
3597 * resulting struct can be deallocated by calling avcodec_close() on it followed
3600 * @param codec if non-NULL, allocate private data and initialize defaults
3601 * for the given codec. It is illegal to then call avcodec_open2()
3602 * with a different codec.
3603 * If NULL, then the codec-specific defaults won't be initialized,
3604 * which may result in suboptimal default settings (this is
3605 * important mainly for encoders, e.g. libx264).
3607 * @return An AVCodecContext filled with default values or NULL on failure.
3608 * @see avcodec_get_context_defaults
3610 AVCodecContext *avcodec_alloc_context3(AVCodec *codec);
3613 * Copy the settings of the source AVCodecContext into the destination
3614 * AVCodecContext. The resulting destination codec context will be
3615 * unopened, i.e. you are required to call avcodec_open2() before you
3616 * can use this AVCodecContext to decode/encode video/audio data.
3618 * @param dest target codec context, should be initialized with
3619 * avcodec_alloc_context3(), but otherwise uninitialized
3620 * @param src source codec context
3621 * @return AVERROR() on error (e.g. memory allocation error), 0 on success
3623 int avcodec_copy_context(AVCodecContext *dest, const AVCodecContext *src);
3626 * Set the fields of the given AVFrame to default values.
3628 * @param pic The AVFrame of which the fields should be set to default values.
3630 void avcodec_get_frame_defaults(AVFrame *pic);
3633 * Allocate an AVFrame and set its fields to default values. The resulting
3634 * struct can be deallocated by simply calling av_free().
3636 * @return An AVFrame filled with default values or NULL on failure.
3637 * @see avcodec_get_frame_defaults
3639 AVFrame *avcodec_alloc_frame(void);
3641 int avcodec_default_get_buffer(AVCodecContext *s, AVFrame *pic);
3642 void avcodec_default_release_buffer(AVCodecContext *s, AVFrame *pic);
3643 int avcodec_default_reget_buffer(AVCodecContext *s, AVFrame *pic);
3646 * Return the amount of padding in pixels which the get_buffer callback must
3647 * provide around the edge of the image for codecs which do not have the
3648 * CODEC_FLAG_EMU_EDGE flag.
3650 * @return Required padding in pixels.
3652 unsigned avcodec_get_edge_width(void);
3654 * Modify width and height values so that they will result in a memory
3655 * buffer that is acceptable for the codec if you do not use any horizontal
3658 * May only be used if a codec with CODEC_CAP_DR1 has been opened.
3659 * If CODEC_FLAG_EMU_EDGE is not set, the dimensions must have been increased
3660 * according to avcodec_get_edge_width() before.
3662 void avcodec_align_dimensions(AVCodecContext *s, int *width, int *height);
3664 * Modify width and height values so that they will result in a memory
3665 * buffer that is acceptable for the codec if you also ensure that all
3666 * line sizes are a multiple of the respective linesize_align[i].
3668 * May only be used if a codec with CODEC_CAP_DR1 has been opened.
3669 * If CODEC_FLAG_EMU_EDGE is not set, the dimensions must have been increased
3670 * according to avcodec_get_edge_width() before.
3672 void avcodec_align_dimensions2(AVCodecContext *s, int *width, int *height,
3673 int linesize_align[AV_NUM_DATA_POINTERS]);
3675 enum PixelFormat avcodec_default_get_format(struct AVCodecContext *s, const enum PixelFormat * fmt);
3677 int avcodec_default_execute(AVCodecContext *c, int (*func)(AVCodecContext *c2, void *arg2),void *arg, int *ret, int count, int size);
3678 int avcodec_default_execute2(AVCodecContext *c, int (*func)(AVCodecContext *c2, void *arg2, int, int),void *arg, int *ret, int count);
3679 //FIXME func typedef
3681 #if FF_API_AVCODEC_OPEN
3683 * Initialize the AVCodecContext to use the given AVCodec. Prior to using this
3684 * function the context has to be allocated.
3686 * The functions avcodec_find_decoder_by_name(), avcodec_find_encoder_by_name(),
3687 * avcodec_find_decoder() and avcodec_find_encoder() provide an easy way for
3688 * retrieving a codec.
3690 * @warning This function is not thread safe!
3693 * avcodec_register_all();
3694 * codec = avcodec_find_decoder(CODEC_ID_H264);
3698 * context = avcodec_alloc_context3(codec);
3700 * if (avcodec_open(context, codec) < 0)
3704 * @param avctx The context which will be set up to use the given codec.
3705 * @param codec The codec to use within the context.
3706 * @return zero on success, a negative value on error
3707 * @see avcodec_alloc_context3, avcodec_find_decoder, avcodec_find_encoder, avcodec_close
3709 * @deprecated use avcodec_open2
3711 attribute_deprecated
3712 int avcodec_open(AVCodecContext *avctx, AVCodec *codec);
3716 * Initialize the AVCodecContext to use the given AVCodec. Prior to using this
3717 * function the context has to be allocated with avcodec_alloc_context3().
3719 * The functions avcodec_find_decoder_by_name(), avcodec_find_encoder_by_name(),
3720 * avcodec_find_decoder() and avcodec_find_encoder() provide an easy way for
3721 * retrieving a codec.
3723 * @warning This function is not thread safe!
3726 * avcodec_register_all();
3727 * av_dict_set(&opts, "b", "2.5M", 0);
3728 * codec = avcodec_find_decoder(CODEC_ID_H264);
3732 * context = avcodec_alloc_context3(codec);
3734 * if (avcodec_open2(context, codec, opts) < 0)
3738 * @param avctx The context to initialize.
3739 * @param codec The codec to open this context for. If a non-NULL codec has been
3740 * previously passed to avcodec_alloc_context3() or
3741 * avcodec_get_context_defaults3() for this context, then this
3742 * parameter MUST be either NULL or equal to the previously passed
3744 * @param options A dictionary filled with AVCodecContext and codec-private options.
3745 * On return this object will be filled with options that were not found.
3747 * @return zero on success, a negative value on error
3748 * @see avcodec_alloc_context3(), avcodec_find_decoder(), avcodec_find_encoder(),
3749 * av_dict_set(), av_opt_find().
3751 int avcodec_open2(AVCodecContext *avctx, AVCodec *codec, AVDictionary **options);
3753 #if FF_API_OLD_DECODE_AUDIO
3755 * Wrapper function which calls avcodec_decode_audio4.
3757 * @deprecated Use avcodec_decode_audio4 instead.
3759 * Decode the audio frame of size avpkt->size from avpkt->data into samples.
3760 * Some decoders may support multiple frames in a single AVPacket, such
3761 * decoders would then just decode the first frame. In this case,
3762 * avcodec_decode_audio3 has to be called again with an AVPacket that contains
3763 * the remaining data in order to decode the second frame etc.
3765 * could be outputted, frame_size_ptr is zero. Otherwise, it is the
3766 * decompressed frame size in bytes.
3768 * @warning You must set frame_size_ptr to the allocated size of the
3769 * output buffer before calling avcodec_decode_audio3().
3771 * @warning The input buffer must be FF_INPUT_BUFFER_PADDING_SIZE larger than
3772 * the actual read bytes because some optimized bitstream readers read 32 or 64
3773 * bits at once and could read over the end.
3775 * @warning The end of the input buffer avpkt->data should be set to 0 to ensure that
3776 * no overreading happens for damaged MPEG streams.
3778 * @warning You must not provide a custom get_buffer() when using
3779 * avcodec_decode_audio3(). Doing so will override it with
3780 * avcodec_default_get_buffer. Use avcodec_decode_audio4() instead,
3781 * which does allow the application to provide a custom get_buffer().
3783 * @note You might have to align the input buffer avpkt->data and output buffer
3784 * samples. The alignment requirements depend on the CPU: On some CPUs it isn't
3785 * necessary at all, on others it won't work at all if not aligned and on others
3786 * it will work but it will have an impact on performance.
3788 * In practice, avpkt->data should have 4 byte alignment at minimum and
3789 * samples should be 16 byte aligned unless the CPU doesn't need it
3790 * (AltiVec and SSE do).
3792 * @note Codecs which have the CODEC_CAP_DELAY capability set have a delay
3793 * between input and output, these need to be fed with avpkt->data=NULL,
3794 * avpkt->size=0 at the end to return the remaining frames.
3796 * @param avctx the codec context
3797 * @param[out] samples the output buffer, sample type in avctx->sample_fmt
3798 * If the sample format is planar, each channel plane will
3799 * be the same size, with no padding between channels.
3800 * @param[in,out] frame_size_ptr the output buffer size in bytes
3801 * @param[in] avpkt The input AVPacket containing the input buffer.
3802 * You can create such packet with av_init_packet() and by then setting
3803 * data and size, some decoders might in addition need other fields.
3804 * All decoders are designed to use the least fields possible though.
3805 * @return On error a negative value is returned, otherwise the number of bytes
3806 * used or zero if no frame data was decompressed (used) from the input AVPacket.
3808 attribute_deprecated int avcodec_decode_audio3(AVCodecContext *avctx, int16_t *samples,
3809 int *frame_size_ptr,
3814 * Decode the audio frame of size avpkt->size from avpkt->data into frame.
3816 * Some decoders may support multiple frames in a single AVPacket. Such
3817 * decoders would then just decode the first frame. In this case,
3818 * avcodec_decode_audio4 has to be called again with an AVPacket containing
3819 * the remaining data in order to decode the second frame, etc...
3820 * Even if no frames are returned, the packet needs to be fed to the decoder
3821 * with remaining data until it is completely consumed or an error occurs.
3823 * @warning The input buffer, avpkt->data must be FF_INPUT_BUFFER_PADDING_SIZE
3824 * larger than the actual read bytes because some optimized bitstream
3825 * readers read 32 or 64 bits at once and could read over the end.
3827 * @note You might have to align the input buffer. The alignment requirements
3828 * depend on the CPU and the decoder.
3830 * @param avctx the codec context
3831 * @param[out] frame The AVFrame in which to store decoded audio samples.
3832 * Decoders request a buffer of a particular size by setting
3833 * AVFrame.nb_samples prior to calling get_buffer(). The
3834 * decoder may, however, only utilize part of the buffer by
3835 * setting AVFrame.nb_samples to a smaller value in the
3837 * @param[out] got_frame_ptr Zero if no frame could be decoded, otherwise it is
3839 * @param[in] avpkt The input AVPacket containing the input buffer.
3840 * At least avpkt->data and avpkt->size should be set. Some
3841 * decoders might also require additional fields to be set.
3842 * @return A negative error code is returned if an error occurred during
3843 * decoding, otherwise the number of bytes consumed from the input
3844 * AVPacket is returned.
3846 int avcodec_decode_audio4(AVCodecContext *avctx, AVFrame *frame,
3847 int *got_frame_ptr, AVPacket *avpkt);
3850 * Decode the video frame of size avpkt->size from avpkt->data into picture.
3851 * Some decoders may support multiple frames in a single AVPacket, such
3852 * decoders would then just decode the first frame.
3854 * @warning The input buffer must be FF_INPUT_BUFFER_PADDING_SIZE larger than
3855 * the actual read bytes because some optimized bitstream readers read 32 or 64
3856 * bits at once and could read over the end.
3858 * @warning The end of the input buffer buf should be set to 0 to ensure that
3859 * no overreading happens for damaged MPEG streams.
3861 * @note You might have to align the input buffer avpkt->data.
3862 * The alignment requirements depend on the CPU: on some CPUs it isn't
3863 * necessary at all, on others it won't work at all if not aligned and on others
3864 * it will work but it will have an impact on performance.
3866 * In practice, avpkt->data should have 4 byte alignment at minimum.
3868 * @note Codecs which have the CODEC_CAP_DELAY capability set have a delay
3869 * between input and output, these need to be fed with avpkt->data=NULL,
3870 * avpkt->size=0 at the end to return the remaining frames.
3872 * @param avctx the codec context
3873 * @param[out] picture The AVFrame in which the decoded video frame will be stored.
3874 * Use avcodec_alloc_frame to get an AVFrame, the codec will
3875 * allocate memory for the actual bitmap.
3876 * with default get/release_buffer(), the decoder frees/reuses the bitmap as it sees fit.
3877 * with overridden get/release_buffer() (needs CODEC_CAP_DR1) the user decides into what buffer the decoder
3878 * decodes and the decoder tells the user once it does not need the data anymore,
3879 * the user app can at this point free/reuse/keep the memory as it sees fit.
3881 * @param[in] avpkt The input AVpacket containing the input buffer.
3882 * You can create such packet with av_init_packet() and by then setting
3883 * data and size, some decoders might in addition need other fields like
3884 * flags&AV_PKT_FLAG_KEY. All decoders are designed to use the least
3886 * @param[in,out] got_picture_ptr Zero if no frame could be decompressed, otherwise, it is nonzero.
3887 * @return On error a negative value is returned, otherwise the number of bytes
3888 * used or zero if no frame could be decompressed.
3890 int avcodec_decode_video2(AVCodecContext *avctx, AVFrame *picture,
3891 int *got_picture_ptr,
3892 const AVPacket *avpkt);
3895 * Decode a subtitle message.
3896 * Return a negative value on error, otherwise return the number of bytes used.
3897 * If no subtitle could be decompressed, got_sub_ptr is zero.
3898 * Otherwise, the subtitle is stored in *sub.
3899 * Note that CODEC_CAP_DR1 is not available for subtitle codecs. This is for
3900 * simplicity, because the performance difference is expect to be negligible
3901 * and reusing a get_buffer written for video codecs would probably perform badly
3902 * due to a potentially very different allocation pattern.
3904 * @param avctx the codec context
3905 * @param[out] sub The AVSubtitle in which the decoded subtitle will be stored, must be
3906 freed with avsubtitle_free if *got_sub_ptr is set.
3907 * @param[in,out] got_sub_ptr Zero if no subtitle could be decompressed, otherwise, it is nonzero.
3908 * @param[in] avpkt The input AVPacket containing the input buffer.
3910 int avcodec_decode_subtitle2(AVCodecContext *avctx, AVSubtitle *sub,
3915 * Free all allocated data in the given subtitle struct.
3917 * @param sub AVSubtitle to free.
3919 void avsubtitle_free(AVSubtitle *sub);
3921 #if FF_API_OLD_ENCODE_AUDIO
3923 * Encode an audio frame from samples into buf.
3925 * @deprecated Use avcodec_encode_audio2 instead.
3927 * @note The output buffer should be at least FF_MIN_BUFFER_SIZE bytes large.
3928 * However, for codecs with avctx->frame_size equal to 0 (e.g. PCM) the user
3929 * will know how much space is needed because it depends on the value passed
3930 * in buf_size as described below. In that case a lower value can be used.
3932 * @param avctx the codec context
3933 * @param[out] buf the output buffer
3934 * @param[in] buf_size the output buffer size
3935 * @param[in] samples the input buffer containing the samples
3936 * The number of samples read from this buffer is frame_size*channels,
3937 * both of which are defined in avctx.
3938 * For codecs which have avctx->frame_size equal to 0 (e.g. PCM) the number of
3939 * samples read from samples is equal to:
3940 * buf_size * 8 / (avctx->channels * av_get_bits_per_sample(avctx->codec_id))
3941 * This also implies that av_get_bits_per_sample() must not return 0 for these
3943 * @return On error a negative value is returned, on success zero or the number
3944 * of bytes used to encode the data read from the input buffer.
3946 int attribute_deprecated avcodec_encode_audio(AVCodecContext *avctx,
3947 uint8_t *buf, int buf_size,
3948 const short *samples);
3952 * Encode a frame of audio.
3954 * Takes input samples from frame and writes the next output packet, if
3955 * available, to avpkt. The output packet does not necessarily contain data for
3956 * the most recent frame, as encoders can delay, split, and combine input frames
3957 * internally as needed.
3959 * @param avctx codec context
3960 * @param avpkt output AVPacket.
3961 * The user can supply an output buffer by setting
3962 * avpkt->data and avpkt->size prior to calling the
3963 * function, but if the size of the user-provided data is not
3964 * large enough, encoding will fail. All other AVPacket fields
3965 * will be reset by the encoder using av_init_packet(). If
3966 * avpkt->data is NULL, the encoder will allocate it.
3967 * The encoder will set avpkt->size to the size of the
3969 * @param[in] frame AVFrame containing the raw audio data to be encoded.
3970 * May be NULL when flushing an encoder that has the
3971 * CODEC_CAP_DELAY capability set.
3972 * There are 2 codec capabilities that affect the allowed
3973 * values of frame->nb_samples.
3974 * If CODEC_CAP_SMALL_LAST_FRAME is set, then only the final
3975 * frame may be smaller than avctx->frame_size, and all other
3976 * frames must be equal to avctx->frame_size.
3977 * If CODEC_CAP_VARIABLE_FRAME_SIZE is set, then each frame
3978 * can have any number of samples.
3979 * If neither is set, frame->nb_samples must be equal to
3980 * avctx->frame_size for all frames.
3981 * @param[out] got_packet_ptr This field is set to 1 by libavcodec if the
3982 * output packet is non-empty, and to 0 if it is
3983 * empty. If the function returns an error, the
3984 * packet can be assumed to be invalid, and the
3985 * value of got_packet_ptr is undefined and should
3987 * @return 0 on success, negative error code on failure
3989 int avcodec_encode_audio2(AVCodecContext *avctx, AVPacket *avpkt,
3990 const AVFrame *frame, int *got_packet_ptr);
3993 * Fill audio frame data and linesize.
3994 * AVFrame extended_data channel pointers are allocated if necessary for
3997 * @param frame the AVFrame
3998 * frame->nb_samples must be set prior to calling the
3999 * function. This function fills in frame->data,
4000 * frame->extended_data, frame->linesize[0].
4001 * @param nb_channels channel count
4002 * @param sample_fmt sample format
4003 * @param buf buffer to use for frame data
4004 * @param buf_size size of buffer
4005 * @param align plane size sample alignment
4006 * @return 0 on success, negative error code on failure
4008 int avcodec_fill_audio_frame(AVFrame *frame, int nb_channels,
4009 enum AVSampleFormat sample_fmt, const uint8_t *buf,
4010 int buf_size, int align);
4012 #if FF_API_OLD_ENCODE_VIDEO
4014 * @deprecated use avcodec_encode_video2() instead.
4016 * Encode a video frame from pict into buf.
4017 * The input picture should be
4018 * stored using a specific format, namely avctx.pix_fmt.
4020 * @param avctx the codec context
4021 * @param[out] buf the output buffer for the bitstream of encoded frame
4022 * @param[in] buf_size the size of the output buffer in bytes
4023 * @param[in] pict the input picture to encode
4024 * @return On error a negative value is returned, on success zero or the number
4025 * of bytes used from the output buffer.
4027 attribute_deprecated
4028 int avcodec_encode_video(AVCodecContext *avctx, uint8_t *buf, int buf_size,
4029 const AVFrame *pict);
4033 * Encode a frame of video.
4035 * Takes input raw video data from frame and writes the next output packet, if
4036 * available, to avpkt. The output packet does not necessarily contain data for
4037 * the most recent frame, as encoders can delay and reorder input frames
4038 * internally as needed.
4040 * @param avctx codec context
4041 * @param avpkt output AVPacket.
4042 * The user can supply an output buffer by setting
4043 * avpkt->data and avpkt->size prior to calling the
4044 * function, but if the size of the user-provided data is not
4045 * large enough, encoding will fail. All other AVPacket fields
4046 * will be reset by the encoder using av_init_packet(). If
4047 * avpkt->data is NULL, the encoder will allocate it.
4048 * The encoder will set avpkt->size to the size of the
4049 * output packet. The returned data (if any) belongs to the
4050 * caller, he is responsible for freeing it.
4051 * @param[in] frame AVFrame containing the raw video data to be encoded.
4052 * May be NULL when flushing an encoder that has the
4053 * CODEC_CAP_DELAY capability set.
4054 * @param[out] got_packet_ptr This field is set to 1 by libavcodec if the
4055 * output packet is non-empty, and to 0 if it is
4056 * empty. If the function returns an error, the
4057 * packet can be assumed to be invalid, and the
4058 * value of got_packet_ptr is undefined and should
4060 * @return 0 on success, negative error code on failure
4062 int avcodec_encode_video2(AVCodecContext *avctx, AVPacket *avpkt,
4063 const AVFrame *frame, int *got_packet_ptr);
4065 int avcodec_encode_subtitle(AVCodecContext *avctx, uint8_t *buf, int buf_size,
4066 const AVSubtitle *sub);
4069 * Close a given AVCodecContext and free all the data associated with it
4070 * (but not the AVCodecContext itself).
4072 * Calling this function on an AVCodecContext that hasn't been opened will free
4073 * the codec-specific data allocated in avcodec_alloc_context3() /
4074 * avcodec_get_context_defaults3() with a non-NULL codec. Subsequent calls will
4077 int avcodec_close(AVCodecContext *avctx);
4080 * Register all the codecs, parsers and bitstream filters which were enabled at
4081 * configuration time. If you do not call this function you can select exactly
4082 * which formats you want to support, by using the individual registration
4085 * @see avcodec_register
4086 * @see av_register_codec_parser
4087 * @see av_register_bitstream_filter
4089 void avcodec_register_all(void);
4092 * Flush buffers, should be called when seeking or when switching to a different stream.
4094 void avcodec_flush_buffers(AVCodecContext *avctx);
4096 void avcodec_default_free_buffers(AVCodecContext *s);
4098 /* misc useful functions */
4101 * Return codec bits per sample.
4103 * @param[in] codec_id the codec
4104 * @return Number of bits per sample or zero if unknown for the given codec.
4106 int av_get_bits_per_sample(enum CodecID codec_id);
4109 * Return the PCM codec associated with a sample format.
4110 * @param be endianness, 0 for little, 1 for big,
4111 * -1 (or anything else) for native
4112 * @return CODEC_ID_PCM_* or CODEC_ID_NONE
4114 enum CodecID av_get_pcm_codec(enum AVSampleFormat fmt, int be);
4117 typedef struct AVCodecParserContext {
4119 struct AVCodecParser *parser;
4120 int64_t frame_offset; /* offset of the current frame */
4121 int64_t cur_offset; /* current offset
4122 (incremented by each av_parser_parse()) */
4123 int64_t next_frame_offset; /* offset of the next frame */
4125 int pict_type; /* XXX: Put it back in AVCodecContext. */
4127 * This field is used for proper frame duration computation in lavf.
4128 * It signals, how much longer the frame duration of the current frame
4129 * is compared to normal frame duration.
4131 * frame_duration = (1 + repeat_pict) * time_base
4133 * It is used by codecs like H.264 to display telecined material.
4135 int repeat_pict; /* XXX: Put it back in AVCodecContext. */
4136 int64_t pts; /* pts of the current frame */
4137 int64_t dts; /* dts of the current frame */
4142 int fetch_timestamp;
4144 #define AV_PARSER_PTS_NB 4
4145 int cur_frame_start_index;
4146 int64_t cur_frame_offset[AV_PARSER_PTS_NB];
4147 int64_t cur_frame_pts[AV_PARSER_PTS_NB];
4148 int64_t cur_frame_dts[AV_PARSER_PTS_NB];
4151 #define PARSER_FLAG_COMPLETE_FRAMES 0x0001
4152 #define PARSER_FLAG_ONCE 0x0002
4153 /// Set if the parser has a valid file offset
4154 #define PARSER_FLAG_FETCHED_OFFSET 0x0004
4156 int64_t offset; ///< byte offset from starting packet start
4157 int64_t cur_frame_end[AV_PARSER_PTS_NB];
4160 * Set by parser to 1 for key frames and 0 for non-key frames.
4161 * It is initialized to -1, so if the parser doesn't set this flag,
4162 * old-style fallback using AV_PICTURE_TYPE_I picture type as key frames
4168 * Time difference in stream time base units from the pts of this
4169 * packet to the point at which the output from the decoder has converged
4170 * independent from the availability of previous frames. That is, the
4171 * frames are virtually identical no matter if decoding started from
4172 * the very first frame or from this keyframe.
4173 * Is AV_NOPTS_VALUE if unknown.
4174 * This field is not the display duration of the current frame.
4175 * This field has no meaning if the packet does not have AV_PKT_FLAG_KEY
4178 * The purpose of this field is to allow seeking in streams that have no
4179 * keyframes in the conventional sense. It corresponds to the
4180 * recovery point SEI in H.264 and match_time_delta in NUT. It is also
4181 * essential for some types of subtitle streams to ensure that all
4182 * subtitles are correctly displayed after seeking.
4184 int64_t convergence_duration;
4186 // Timestamp generation support:
4188 * Synchronization point for start of timestamp generation.
4190 * Set to >0 for sync point, 0 for no sync point and <0 for undefined
4193 * For example, this corresponds to presence of H.264 buffering period
4199 * Offset of the current timestamp against last timestamp sync point in
4200 * units of AVCodecContext.time_base.
4202 * Set to INT_MIN when dts_sync_point unused. Otherwise, it must
4203 * contain a valid timestamp offset.
4205 * Note that the timestamp of sync point has usually a nonzero
4206 * dts_ref_dts_delta, which refers to the previous sync point. Offset of
4207 * the next frame after timestamp sync point will be usually 1.
4209 * For example, this corresponds to H.264 cpb_removal_delay.
4211 int dts_ref_dts_delta;
4214 * Presentation delay of current frame in units of AVCodecContext.time_base.
4216 * Set to INT_MIN when dts_sync_point unused. Otherwise, it must
4217 * contain valid non-negative timestamp delta (presentation time of a frame
4218 * must not lie in the past).
4220 * This delay represents the difference between decoding and presentation
4221 * time of the frame.
4223 * For example, this corresponds to H.264 dpb_output_delay.
4228 * Position of the packet in file.
4230 * Analogous to cur_frame_pts/dts
4232 int64_t cur_frame_pos[AV_PARSER_PTS_NB];
4235 * Byte position of currently parsed frame in stream.
4240 * Previous frame byte position.
4245 * Duration of the current frame.
4246 * For audio, this is in units of 1 / AVCodecContext.sample_rate.
4247 * For all other types, this is in units of AVCodecContext.time_base.
4250 } AVCodecParserContext;
4252 typedef struct AVCodecParser {
4253 int codec_ids[5]; /* several codec IDs are permitted */
4255 int (*parser_init)(AVCodecParserContext *s);
4256 int (*parser_parse)(AVCodecParserContext *s,
4257 AVCodecContext *avctx,
4258 const uint8_t **poutbuf, int *poutbuf_size,
4259 const uint8_t *buf, int buf_size);
4260 void (*parser_close)(AVCodecParserContext *s);
4261 int (*split)(AVCodecContext *avctx, const uint8_t *buf, int buf_size);
4262 struct AVCodecParser *next;
4265 AVCodecParser *av_parser_next(AVCodecParser *c);
4267 void av_register_codec_parser(AVCodecParser *parser);
4268 AVCodecParserContext *av_parser_init(int codec_id);
4273 * @param s parser context.
4274 * @param avctx codec context.
4275 * @param poutbuf set to pointer to parsed buffer or NULL if not yet finished.
4276 * @param poutbuf_size set to size of parsed buffer or zero if not yet finished.
4277 * @param buf input buffer.
4278 * @param buf_size input length, to signal EOF, this should be 0 (so that the last frame can be output).
4279 * @param pts input presentation timestamp.
4280 * @param dts input decoding timestamp.
4281 * @param pos input byte position in stream.
4282 * @return the number of bytes of the input bitstream used.
4287 * len = av_parser_parse2(myparser, AVCodecContext, &data, &size,
4294 * decode_frame(data, size);
4298 int av_parser_parse2(AVCodecParserContext *s,
4299 AVCodecContext *avctx,
4300 uint8_t **poutbuf, int *poutbuf_size,
4301 const uint8_t *buf, int buf_size,
4302 int64_t pts, int64_t dts,
4305 int av_parser_change(AVCodecParserContext *s,
4306 AVCodecContext *avctx,
4307 uint8_t **poutbuf, int *poutbuf_size,
4308 const uint8_t *buf, int buf_size, int keyframe);
4309 void av_parser_close(AVCodecParserContext *s);
4312 typedef struct AVBitStreamFilterContext {
4314 struct AVBitStreamFilter *filter;
4315 AVCodecParserContext *parser;
4316 struct AVBitStreamFilterContext *next;
4317 } AVBitStreamFilterContext;
4320 typedef struct AVBitStreamFilter {
4323 int (*filter)(AVBitStreamFilterContext *bsfc,
4324 AVCodecContext *avctx, const char *args,
4325 uint8_t **poutbuf, int *poutbuf_size,
4326 const uint8_t *buf, int buf_size, int keyframe);
4327 void (*close)(AVBitStreamFilterContext *bsfc);
4328 struct AVBitStreamFilter *next;
4329 } AVBitStreamFilter;
4331 void av_register_bitstream_filter(AVBitStreamFilter *bsf);
4332 AVBitStreamFilterContext *av_bitstream_filter_init(const char *name);
4333 int av_bitstream_filter_filter(AVBitStreamFilterContext *bsfc,
4334 AVCodecContext *avctx, const char *args,
4335 uint8_t **poutbuf, int *poutbuf_size,
4336 const uint8_t *buf, int buf_size, int keyframe);
4337 void av_bitstream_filter_close(AVBitStreamFilterContext *bsf);
4339 AVBitStreamFilter *av_bitstream_filter_next(AVBitStreamFilter *f);
4344 * Reallocate the given block if it is not large enough, otherwise do nothing.
4348 void *av_fast_realloc(void *ptr, unsigned int *size, size_t min_size);
4351 * Allocate a buffer, reusing the given one if large enough.
4353 * Contrary to av_fast_realloc the current buffer contents might not be
4354 * preserved and on error the old buffer is freed, thus no special
4355 * handling to avoid memleaks is necessary.
4357 * @param ptr pointer to pointer to already allocated buffer, overwritten with pointer to new buffer
4358 * @param size size of the buffer *ptr points to
4359 * @param min_size minimum size of *ptr buffer after returning, *ptr will be NULL and
4360 * *size 0 if an error occurred.
4362 void av_fast_malloc(void *ptr, unsigned int *size, size_t min_size);
4365 * Same behaviour av_fast_malloc but the buffer has additional
4366 * FF_INPUT_PADDING_SIZE at the end which will will always be 0.
4368 * In addition the whole buffer will initially and after resizes
4369 * be 0-initialized so that no uninitialized data will ever appear.
4371 void av_fast_padded_malloc(void *ptr, unsigned int *size, size_t min_size);
4374 * Copy image src to dst. Wraps av_picture_data_copy() above.
4376 void av_picture_copy(AVPicture *dst, const AVPicture *src,
4377 enum PixelFormat pix_fmt, int width, int height);
4380 * Crop image top and left side.
4382 int av_picture_crop(AVPicture *dst, const AVPicture *src,
4383 enum PixelFormat pix_fmt, int top_band, int left_band);
4388 int av_picture_pad(AVPicture *dst, const AVPicture *src, int height, int width, enum PixelFormat pix_fmt,
4389 int padtop, int padbottom, int padleft, int padright, int *color);
4392 * Encode extradata length to a buffer. Used by xiph codecs.
4394 * @param s buffer to write to; must be at least (v/255+1) bytes long
4395 * @param v size of extradata in bytes
4396 * @return number of bytes written to the buffer.
4398 unsigned int av_xiphlacing(unsigned char *s, unsigned int v);
4401 * Log a generic warning message about a missing feature. This function is
4402 * intended to be used internally by FFmpeg (libavcodec, libavformat, etc.)
4403 * only, and would normally not be used by applications.
4404 * @param[in] avc a pointer to an arbitrary struct of which the first field is
4405 * a pointer to an AVClass struct
4406 * @param[in] feature string containing the name of the missing feature
4407 * @param[in] want_sample indicates if samples are wanted which exhibit this feature.
4408 * If want_sample is non-zero, additional verbage will be added to the log
4409 * message which tells the user how to report samples to the development
4412 void av_log_missing_feature(void *avc, const char *feature, int want_sample);
4415 * Log a generic warning message asking for a sample. This function is
4416 * intended to be used internally by FFmpeg (libavcodec, libavformat, etc.)
4417 * only, and would normally not be used by applications.
4418 * @param[in] avc a pointer to an arbitrary struct of which the first field is
4419 * a pointer to an AVClass struct
4420 * @param[in] msg string containing an optional message, or NULL if no message
4422 void av_log_ask_for_sample(void *avc, const char *msg, ...) av_printf_format(2, 3);
4425 * Register the hardware accelerator hwaccel.
4427 void av_register_hwaccel(AVHWAccel *hwaccel);
4430 * If hwaccel is NULL, returns the first registered hardware accelerator,
4431 * if hwaccel is non-NULL, returns the next registered hardware accelerator
4432 * after hwaccel, or NULL if hwaccel is the last one.
4434 AVHWAccel *av_hwaccel_next(AVHWAccel *hwaccel);
4438 * Lock operation used by lockmgr
4441 AV_LOCK_CREATE, ///< Create a mutex
4442 AV_LOCK_OBTAIN, ///< Lock the mutex
4443 AV_LOCK_RELEASE, ///< Unlock the mutex
4444 AV_LOCK_DESTROY, ///< Free mutex resources
4448 * Register a user provided lock manager supporting the operations
4449 * specified by AVLockOp. mutex points to a (void *) where the
4450 * lockmgr should store/get a pointer to a user allocated mutex. It's
4451 * NULL upon AV_LOCK_CREATE and != NULL for all other ops.
4453 * @param cb User defined callback. Note: FFmpeg may invoke calls to this
4454 * callback during the call to av_lockmgr_register().
4455 * Thus, the application must be prepared to handle that.
4456 * If cb is set to NULL the lockmgr will be unregistered.
4457 * Also note that during unregistration the previously registered
4458 * lockmgr callback may also be invoked.
4460 int av_lockmgr_register(int (*cb)(void **mutex, enum AVLockOp op));
4463 * Get the type of the given codec.
4465 enum AVMediaType avcodec_get_type(enum CodecID codec_id);
4468 * Get the AVClass for AVCodecContext. It can be used in combination with
4469 * AV_OPT_SEARCH_FAKE_OBJ for examining options.
4471 * @see av_opt_find().
4473 const AVClass *avcodec_get_class(void);
4476 * Get the AVClass for AVFrame. It can be used in combination with
4477 * AV_OPT_SEARCH_FAKE_OBJ for examining options.
4479 * @see av_opt_find().
4481 const AVClass *avcodec_get_frame_class(void);
4484 * @return a positive value if s is open (i.e. avcodec_open2() was called on it
4485 * with no corresponding avcodec_close()), 0 otherwise.
4487 int avcodec_is_open(AVCodecContext *s);
4489 #endif /* AVCODEC_AVCODEC_H */