2 * copyright (c) 2001 Fabrice Bellard
4 * This file is part of Libav.
6 * Libav is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
11 * Libav is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with Libav; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21 #ifndef AVCODEC_AVCODEC_H
22 #define AVCODEC_AVCODEC_H
30 #include "libavutil/samplefmt.h"
31 #include "libavutil/avutil.h"
32 #include "libavutil/cpu.h"
33 #include "libavutil/dict.h"
34 #include "libavutil/log.h"
35 #include "libavutil/pixfmt.h"
36 #include "libavutil/rational.h"
38 #include "libavcodec/version.h"
40 * @defgroup libavc Encoding/Decoding Library
43 * @defgroup lavc_decoding Decoding
47 * @defgroup lavc_encoding Encoding
51 * @defgroup lavc_codec Codecs
53 * @defgroup lavc_codec_native Native Codecs
56 * @defgroup lavc_codec_wrappers External library wrappers
59 * @defgroup lavc_codec_hwaccel Hardware Accelerators bridge
63 * @defgroup lavc_internal Internal
72 * Identify the syntax and semantics of the bitstream.
73 * The principle is roughly:
74 * Two decoders with the same ID can decode the same streams.
75 * Two encoders with the same ID can encode compatible streams.
76 * There may be slight deviations from the principle due to implementation
79 * If you add a codec ID to this list, add it so that
80 * 1. no value of a existing codec ID changes (that would break ABI),
81 * 2. it is as close as possible to similar codecs.
88 CODEC_ID_MPEG2VIDEO, ///< preferred ID for MPEG-1/2 video decoding
89 CODEC_ID_MPEG2VIDEO_XVMC,
126 CODEC_ID_INTERPLAY_VIDEO,
138 CODEC_ID_TRUEMOTION1,
165 CODEC_ID_TRUEMOTION2,
182 CODEC_ID_DSICINVIDEO,
183 CODEC_ID_TIERTEXSEQVIDEO,
191 CODEC_ID_BETHSOFTVID,
207 CODEC_ID_MOTIONPIXELS,
225 CODEC_ID_IFF_BYTERUN1,
249 /* various PCM "codecs" */
250 CODEC_ID_FIRST_AUDIO = 0x10000, ///< A dummy id pointing at the start of audio codecs
251 CODEC_ID_PCM_S16LE = 0x10000,
267 CODEC_ID_PCM_S24DAUD,
269 CODEC_ID_PCM_S16LE_PLANAR,
278 CODEC_ID_PCM_S8_PLANAR,
280 /* various ADPCM codecs */
281 CODEC_ID_ADPCM_IMA_QT = 0x11000,
282 CODEC_ID_ADPCM_IMA_WAV,
283 CODEC_ID_ADPCM_IMA_DK3,
284 CODEC_ID_ADPCM_IMA_DK4,
285 CODEC_ID_ADPCM_IMA_WS,
286 CODEC_ID_ADPCM_IMA_SMJPEG,
295 CODEC_ID_ADPCM_YAMAHA,
296 CODEC_ID_ADPCM_SBPRO_4,
297 CODEC_ID_ADPCM_SBPRO_3,
298 CODEC_ID_ADPCM_SBPRO_2,
300 CODEC_ID_ADPCM_IMA_AMV,
301 CODEC_ID_ADPCM_EA_R1,
302 CODEC_ID_ADPCM_EA_R3,
303 CODEC_ID_ADPCM_EA_R2,
304 CODEC_ID_ADPCM_IMA_EA_SEAD,
305 CODEC_ID_ADPCM_IMA_EA_EACS,
306 CODEC_ID_ADPCM_EA_XAS,
307 CODEC_ID_ADPCM_EA_MAXIS_XA,
308 CODEC_ID_ADPCM_IMA_ISS,
310 CODEC_ID_ADPCM_IMA_APC,
313 CODEC_ID_AMR_NB = 0x12000,
316 /* RealAudio codecs*/
317 CODEC_ID_RA_144 = 0x13000,
320 /* various DPCM codecs */
321 CODEC_ID_ROQ_DPCM = 0x14000,
322 CODEC_ID_INTERPLAY_DPCM,
327 CODEC_ID_MP2 = 0x15000,
328 CODEC_ID_MP3, ///< preferred ID for decoding MPEG audio layer 1, 2 or 3
344 CODEC_ID_WESTWOOD_SND1,
345 CODEC_ID_GSM, ///< as in Berlin toast format
353 CODEC_ID_DSICINAUDIO,
357 CODEC_ID_GSM_MS, /* as found in WAV */
366 CODEC_ID_WMALOSSLESS,
375 CODEC_ID_BINKAUDIO_RDFT,
376 CODEC_ID_BINKAUDIO_DCT,
386 /* subtitle codecs */
387 CODEC_ID_FIRST_SUBTITLE = 0x17000, ///< A dummy ID pointing at the start of subtitle codecs.
388 CODEC_ID_DVD_SUBTITLE = 0x17000,
389 CODEC_ID_DVB_SUBTITLE,
390 CODEC_ID_TEXT, ///< raw UTF-8 text
394 CODEC_ID_HDMV_PGS_SUBTITLE,
395 CODEC_ID_DVB_TELETEXT,
398 /* other specific kind of codecs (generally used for attachments) */
399 CODEC_ID_FIRST_UNKNOWN = 0x18000, ///< A dummy ID pointing at the start of various fake codecs.
400 CODEC_ID_TTF = 0x18000,
402 CODEC_ID_PROBE = 0x19000, ///< codec_id is not known (like CODEC_ID_NONE) but lavf should attempt to identify it
404 CODEC_ID_MPEG2TS = 0x20000, /**< _FAKE_ codec to indicate a raw MPEG-2 TS
405 * stream (only used by libavformat) */
406 CODEC_ID_MPEG4SYSTEMS = 0x20001, /**< _FAKE_ codec to indicate a MPEG-4 Systems
407 * stream (only used by libavformat) */
408 CODEC_ID_FFMETADATA = 0x21000, ///< Dummy codec for streams containing only metadata information.
411 #if FF_API_OLD_DECODE_AUDIO
413 #define AVCODEC_MAX_AUDIO_FRAME_SIZE 192000 // 1 second of 48khz 32bit audio
417 * Required number of additionally allocated bytes at the end of the input bitstream for decoding.
418 * This is mainly needed because some optimized bitstream readers read
419 * 32 or 64 bit at once and could read over the end.<br>
420 * Note: If the first 23 bits of the additional bytes are not 0, then damaged
421 * MPEG bitstreams could cause overread and segfault.
423 #define FF_INPUT_BUFFER_PADDING_SIZE 8
426 * minimum encoding buffer size
427 * Used to avoid some checks during header writing.
429 #define FF_MIN_BUFFER_SIZE 16384
433 * motion estimation type.
436 ME_ZERO = 1, ///< no search, that is use 0,0 vector whenever one is needed
440 ME_EPZS, ///< enhanced predictive zonal search
441 ME_X1, ///< reserved for experiments
442 ME_HEX, ///< hexagon based search
443 ME_UMH, ///< uneven multi-hexagon search
444 ME_ITER, ///< iterative search
445 ME_TESA, ///< transformed exhaustive search algorithm
449 /* We leave some space between them for extensions (drop some
450 * keyframes for intra-only or drop just some bidir frames). */
451 AVDISCARD_NONE =-16, ///< discard nothing
452 AVDISCARD_DEFAULT= 0, ///< discard useless packets like 0 size packets in avi
453 AVDISCARD_NONREF = 8, ///< discard all non reference
454 AVDISCARD_BIDIR = 16, ///< discard all bidirectional frames
455 AVDISCARD_NONKEY = 32, ///< discard all frames except keyframes
456 AVDISCARD_ALL = 48, ///< discard all
459 enum AVColorPrimaries{
460 AVCOL_PRI_BT709 =1, ///< also ITU-R BT1361 / IEC 61966-2-4 / SMPTE RP177 Annex B
461 AVCOL_PRI_UNSPECIFIED=2,
463 AVCOL_PRI_BT470BG =5, ///< also ITU-R BT601-6 625 / ITU-R BT1358 625 / ITU-R BT1700 625 PAL & SECAM
464 AVCOL_PRI_SMPTE170M =6, ///< also ITU-R BT601-6 525 / ITU-R BT1358 525 / ITU-R BT1700 NTSC
465 AVCOL_PRI_SMPTE240M =7, ///< functionally identical to above
467 AVCOL_PRI_NB , ///< Not part of ABI
470 enum AVColorTransferCharacteristic{
471 AVCOL_TRC_BT709 =1, ///< also ITU-R BT1361
472 AVCOL_TRC_UNSPECIFIED=2,
473 AVCOL_TRC_GAMMA22 =4, ///< also ITU-R BT470M / ITU-R BT1700 625 PAL & SECAM
474 AVCOL_TRC_GAMMA28 =5, ///< also ITU-R BT470BG
475 AVCOL_TRC_NB , ///< Not part of ABI
480 AVCOL_SPC_BT709 =1, ///< also ITU-R BT1361 / IEC 61966-2-4 xvYCC709 / SMPTE RP177 Annex B
481 AVCOL_SPC_UNSPECIFIED=2,
483 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
484 AVCOL_SPC_SMPTE170M =6, ///< also ITU-R BT601-6 525 / ITU-R BT1358 525 / ITU-R BT1700 NTSC / functionally identical to above
485 AVCOL_SPC_SMPTE240M =7,
486 AVCOL_SPC_NB , ///< Not part of ABI
490 AVCOL_RANGE_UNSPECIFIED=0,
491 AVCOL_RANGE_MPEG =1, ///< the normal 219*2^(n-8) "MPEG" YUV ranges
492 AVCOL_RANGE_JPEG =2, ///< the normal 2^n-1 "JPEG" YUV ranges
493 AVCOL_RANGE_NB , ///< Not part of ABI
497 * X X 3 4 X X are luma samples,
498 * 1 2 1-6 are possible chroma positions
499 * X X 5 6 X 0 is undefined/unknown position
501 enum AVChromaLocation{
502 AVCHROMA_LOC_UNSPECIFIED=0,
503 AVCHROMA_LOC_LEFT =1, ///< mpeg2/4, h264 default
504 AVCHROMA_LOC_CENTER =2, ///< mpeg1, jpeg, h263
505 AVCHROMA_LOC_TOPLEFT =3, ///< DV
507 AVCHROMA_LOC_BOTTOMLEFT =5,
508 AVCHROMA_LOC_BOTTOM =6,
509 AVCHROMA_LOC_NB , ///< Not part of ABI
512 enum AVAudioServiceType {
513 AV_AUDIO_SERVICE_TYPE_MAIN = 0,
514 AV_AUDIO_SERVICE_TYPE_EFFECTS = 1,
515 AV_AUDIO_SERVICE_TYPE_VISUALLY_IMPAIRED = 2,
516 AV_AUDIO_SERVICE_TYPE_HEARING_IMPAIRED = 3,
517 AV_AUDIO_SERVICE_TYPE_DIALOGUE = 4,
518 AV_AUDIO_SERVICE_TYPE_COMMENTARY = 5,
519 AV_AUDIO_SERVICE_TYPE_EMERGENCY = 6,
520 AV_AUDIO_SERVICE_TYPE_VOICE_OVER = 7,
521 AV_AUDIO_SERVICE_TYPE_KARAOKE = 8,
522 AV_AUDIO_SERVICE_TYPE_NB , ///< Not part of ABI
525 typedef struct RcOverride{
528 int qscale; // If this is 0 then quality_factor will be used instead.
529 float quality_factor;
532 #define FF_MAX_B_FRAMES 16
535 These flags can be passed in AVCodecContext.flags before initialization.
536 Note: Not everything is supported yet.
539 #define CODEC_FLAG_QSCALE 0x0002 ///< Use fixed qscale.
540 #define CODEC_FLAG_4MV 0x0004 ///< 4 MV per MB allowed / advanced prediction for H.263.
541 #define CODEC_FLAG_QPEL 0x0010 ///< Use qpel MC.
542 #define CODEC_FLAG_GMC 0x0020 ///< Use GMC.
543 #define CODEC_FLAG_MV0 0x0040 ///< Always try a MB with MV=<0,0>.
545 * The parent program guarantees that the input for B-frames containing
546 * streams is not written to for at least s->max_b_frames+1 frames, if
547 * this is not set the input will be copied.
549 #define CODEC_FLAG_INPUT_PRESERVED 0x0100
550 #define CODEC_FLAG_PASS1 0x0200 ///< Use internal 2pass ratecontrol in first pass mode.
551 #define CODEC_FLAG_PASS2 0x0400 ///< Use internal 2pass ratecontrol in second pass mode.
552 #define CODEC_FLAG_GRAY 0x2000 ///< Only decode/encode grayscale.
553 #define CODEC_FLAG_EMU_EDGE 0x4000 ///< Don't draw edges.
554 #define CODEC_FLAG_PSNR 0x8000 ///< error[?] variables will be set during encoding.
555 #define CODEC_FLAG_TRUNCATED 0x00010000 /** Input bitstream might be truncated at a random
556 location instead of only at frame boundaries. */
557 #define CODEC_FLAG_NORMALIZE_AQP 0x00020000 ///< Normalize adaptive quantization.
558 #define CODEC_FLAG_INTERLACED_DCT 0x00040000 ///< Use interlaced DCT.
559 #define CODEC_FLAG_LOW_DELAY 0x00080000 ///< Force low delay.
560 #define CODEC_FLAG_GLOBAL_HEADER 0x00400000 ///< Place global headers in extradata instead of every keyframe.
561 #define CODEC_FLAG_BITEXACT 0x00800000 ///< Use only bitexact stuff (except (I)DCT).
562 /* Fx : Flag for h263+ extra options */
563 #define CODEC_FLAG_AC_PRED 0x01000000 ///< H.263 advanced intra coding / MPEG-4 AC prediction
564 #define CODEC_FLAG_LOOP_FILTER 0x00000800 ///< loop filter
565 #define CODEC_FLAG_INTERLACED_ME 0x20000000 ///< interlaced motion estimation
566 #define CODEC_FLAG_CLOSED_GOP 0x80000000
567 #define CODEC_FLAG2_FAST 0x00000001 ///< Allow non spec compliant speedup tricks.
568 #define CODEC_FLAG2_NO_OUTPUT 0x00000004 ///< Skip bitstream encoding.
569 #define CODEC_FLAG2_LOCAL_HEADER 0x00000008 ///< Place global headers at every keyframe instead of in extradata.
570 #if FF_API_MPV_GLOBAL_OPTS
571 #define CODEC_FLAG_CBP_RD 0x04000000 ///< Use rate distortion optimization for cbp.
572 #define CODEC_FLAG_QP_RD 0x08000000 ///< Use rate distortion optimization for qp selectioon.
573 #define CODEC_FLAG2_STRICT_GOP 0x00000002 ///< Strictly enforce GOP size.
574 #define CODEC_FLAG2_SKIP_RD 0x00004000 ///< RD optimal MB level residual skipping
576 #define CODEC_FLAG2_CHUNKS 0x00008000 ///< Input bitstream might be truncated at a packet boundaries instead of only at frame boundaries.
578 /* Unsupported options :
579 * Syntax Arithmetic coding (SAC)
580 * Reference Picture Selection
581 * Independent Segment Decoding */
583 /* codec capabilities */
585 #define CODEC_CAP_DRAW_HORIZ_BAND 0x0001 ///< Decoder can use draw_horiz_band callback.
587 * Codec uses get_buffer() for allocating buffers and supports custom allocators.
588 * If not set, it might not use get_buffer() at all or use operations that
589 * assume the buffer was allocated by avcodec_default_get_buffer.
591 #define CODEC_CAP_DR1 0x0002
592 #define CODEC_CAP_TRUNCATED 0x0008
593 /* Codec can export data for HW decoding (XvMC). */
594 #define CODEC_CAP_HWACCEL 0x0010
596 * Encoder or decoder requires flushing with NULL input at the end in order to
597 * give the complete and correct output.
599 * NOTE: If this flag is not set, the codec is guaranteed to never be fed with
600 * with NULL data. The user can still send NULL data to the public encode
601 * or decode function, but libavcodec will not pass it along to the codec
602 * unless this flag is set.
605 * The decoder has a non-zero delay and needs to be fed with avpkt->data=NULL,
606 * avpkt->size=0 at the end to get the delayed data until the decoder no longer
610 * The encoder needs to be fed with NULL data at the end of encoding until the
611 * encoder no longer returns data.
613 * NOTE: For encoders implementing the AVCodec.encode2() function, setting this
614 * flag also means that the encoder must set the pts and duration for
615 * each output packet. If this flag is not set, the pts and duration will
616 * be determined by libavcodec from the input frame.
618 #define CODEC_CAP_DELAY 0x0020
620 * Codec can be fed a final frame with a smaller size.
621 * This can be used to prevent truncation of the last audio samples.
623 #define CODEC_CAP_SMALL_LAST_FRAME 0x0040
625 * Codec can export data for HW decoding (VDPAU).
627 #define CODEC_CAP_HWACCEL_VDPAU 0x0080
629 * Codec can output multiple frames per AVPacket
630 * Normally demuxers return one frame at a time, demuxers which do not do
631 * are connected to a parser to split what they return into proper frames.
632 * This flag is reserved to the very rare category of codecs which have a
633 * bitstream that cannot be split into frames without timeconsuming
634 * operations like full decoding. Demuxers carring such bitstreams thus
635 * may return multiple frames in a packet. This has many disadvantages like
636 * prohibiting stream copy in many cases thus it should only be considered
639 #define CODEC_CAP_SUBFRAMES 0x0100
641 * Codec is experimental and is thus avoided in favor of non experimental
644 #define CODEC_CAP_EXPERIMENTAL 0x0200
646 * Codec should fill in channel configuration and samplerate instead of container
648 #define CODEC_CAP_CHANNEL_CONF 0x0400
650 * Codec is able to deal with negative linesizes
652 #define CODEC_CAP_NEG_LINESIZES 0x0800
654 * Codec supports frame-level multithreading.
656 #define CODEC_CAP_FRAME_THREADS 0x1000
658 * Codec supports slice-based (or partition-based) multithreading.
660 #define CODEC_CAP_SLICE_THREADS 0x2000
662 * Codec supports changed parameters at any point.
664 #define CODEC_CAP_PARAM_CHANGE 0x4000
666 * Codec supports avctx->thread_count == 0 (auto).
668 #define CODEC_CAP_AUTO_THREADS 0x8000
670 * Audio encoder supports receiving a different number of samples in each call.
672 #define CODEC_CAP_VARIABLE_FRAME_SIZE 0x10000
674 //The following defines may change, don't expect compatibility if you use them.
675 #define MB_TYPE_INTRA4x4 0x0001
676 #define MB_TYPE_INTRA16x16 0x0002 //FIXME H.264-specific
677 #define MB_TYPE_INTRA_PCM 0x0004 //FIXME H.264-specific
678 #define MB_TYPE_16x16 0x0008
679 #define MB_TYPE_16x8 0x0010
680 #define MB_TYPE_8x16 0x0020
681 #define MB_TYPE_8x8 0x0040
682 #define MB_TYPE_INTERLACED 0x0080
683 #define MB_TYPE_DIRECT2 0x0100 //FIXME
684 #define MB_TYPE_ACPRED 0x0200
685 #define MB_TYPE_GMC 0x0400
686 #define MB_TYPE_SKIP 0x0800
687 #define MB_TYPE_P0L0 0x1000
688 #define MB_TYPE_P1L0 0x2000
689 #define MB_TYPE_P0L1 0x4000
690 #define MB_TYPE_P1L1 0x8000
691 #define MB_TYPE_L0 (MB_TYPE_P0L0 | MB_TYPE_P1L0)
692 #define MB_TYPE_L1 (MB_TYPE_P0L1 | MB_TYPE_P1L1)
693 #define MB_TYPE_L0L1 (MB_TYPE_L0 | MB_TYPE_L1)
694 #define MB_TYPE_QUANT 0x00010000
695 #define MB_TYPE_CBP 0x00020000
696 //Note bits 24-31 are reserved for codec specific use (h264 ref0, mpeg1 0mv, ...)
700 * This specifies the area which should be displayed.
701 * Note there may be multiple such areas for one frame.
703 typedef struct AVPanScan{
706 * - encoding: Set by user.
707 * - decoding: Set by libavcodec.
712 * width and height in 1/16 pel
713 * - encoding: Set by user.
714 * - decoding: Set by libavcodec.
720 * position of the top left corner in 1/16 pel for up to 3 fields/frames
721 * - encoding: Set by user.
722 * - decoding: Set by libavcodec.
724 int16_t position[3][2];
727 #define FF_QSCALE_TYPE_MPEG1 0
728 #define FF_QSCALE_TYPE_MPEG2 1
729 #define FF_QSCALE_TYPE_H264 2
730 #define FF_QSCALE_TYPE_VP56 3
732 #define FF_BUFFER_TYPE_INTERNAL 1
733 #define FF_BUFFER_TYPE_USER 2 ///< direct rendering buffers (image is (de)allocated by user)
734 #define FF_BUFFER_TYPE_SHARED 4 ///< Buffer from somewhere else; don't deallocate image (data/base), all other tables are not shared.
735 #define FF_BUFFER_TYPE_COPY 8 ///< Just a (modified) copy of some other buffer, don't deallocate anything.
737 #define FF_BUFFER_HINTS_VALID 0x01 // Buffer hints value is meaningful (if 0 ignore).
738 #define FF_BUFFER_HINTS_READABLE 0x02 // Codec will read from buffer.
739 #define FF_BUFFER_HINTS_PRESERVE 0x04 // User must not alter buffer content.
740 #define FF_BUFFER_HINTS_REUSABLE 0x08 // Codec will reuse the buffer (update).
742 enum AVPacketSideDataType {
744 AV_PKT_DATA_NEW_EXTRADATA,
745 AV_PKT_DATA_PARAM_CHANGE,
748 typedef struct AVPacket {
750 * Presentation timestamp in AVStream->time_base units; the time at which
751 * the decompressed packet will be presented to the user.
752 * Can be AV_NOPTS_VALUE if it is not stored in the file.
753 * pts MUST be larger or equal to dts as presentation cannot happen before
754 * decompression, unless one wants to view hex dumps. Some formats misuse
755 * the terms dts and pts/cts to mean something different. Such timestamps
756 * must be converted to true pts/dts before they are stored in AVPacket.
760 * Decompression timestamp in AVStream->time_base units; the time at which
761 * the packet is decompressed.
762 * Can be AV_NOPTS_VALUE if it is not stored in the file.
769 * A combination of AV_PKT_FLAG values
773 * Additional packet data that can be provided by the container.
774 * Packet can contain several types of side information.
779 enum AVPacketSideDataType type;
784 * Duration of this packet in AVStream->time_base units, 0 if unknown.
785 * Equals next_pts - this_pts in presentation order.
788 void (*destruct)(struct AVPacket *);
790 int64_t pos; ///< byte position in stream, -1 if unknown
793 * Time difference in AVStream->time_base units from the pts of this
794 * packet to the point at which the output from the decoder has converged
795 * independent from the availability of previous frames. That is, the
796 * frames are virtually identical no matter if decoding started from
797 * the very first frame or from this keyframe.
798 * Is AV_NOPTS_VALUE if unknown.
799 * This field is not the display duration of the current packet.
800 * This field has no meaning if the packet does not have AV_PKT_FLAG_KEY
803 * The purpose of this field is to allow seeking in streams that have no
804 * keyframes in the conventional sense. It corresponds to the
805 * recovery point SEI in H.264 and match_time_delta in NUT. It is also
806 * essential for some types of subtitle streams to ensure that all
807 * subtitles are correctly displayed after seeking.
809 int64_t convergence_duration;
811 #define AV_PKT_FLAG_KEY 0x0001 ///< The packet contains a keyframe
812 #define AV_PKT_FLAG_CORRUPT 0x0002 ///< The packet content is corrupted
815 * An AV_PKT_DATA_PARAM_CHANGE side data packet is laid out as follows:
817 * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_COUNT)
818 * s32le channel_count
819 * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_LAYOUT)
820 * u64le channel_layout
821 * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_SAMPLE_RATE)
823 * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_DIMENSIONS)
828 enum AVSideDataParamChangeFlags {
829 AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_COUNT = 0x0001,
830 AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_LAYOUT = 0x0002,
831 AV_SIDE_DATA_PARAM_CHANGE_SAMPLE_RATE = 0x0004,
832 AV_SIDE_DATA_PARAM_CHANGE_DIMENSIONS = 0x0008,
837 * New fields can be added to the end of AVFRAME with minor version
838 * bumps. Removal, reordering and changes to existing fields require
839 * a major version bump.
840 * sizeof(AVFrame) must not be used outside libav*.
842 typedef struct AVFrame {
843 #define AV_NUM_DATA_POINTERS 8
845 * pointer to the picture/channel planes.
846 * This might be different from the first allocated byte
847 * - encoding: Set by user
848 * - decoding: set by AVCodecContext.get_buffer()
850 uint8_t *data[AV_NUM_DATA_POINTERS];
853 * Size, in bytes, of the data for each picture/channel plane.
855 * For audio, only linesize[0] may be set. For planar audio, each channel
856 * plane must be the same size.
858 * - encoding: Set by user
859 * - decoding: set by AVCodecContext.get_buffer()
861 int linesize[AV_NUM_DATA_POINTERS];
864 * pointers to the data planes/channels.
866 * For video, this should simply point to data[].
868 * For planar audio, each channel has a separate data pointer, and
869 * linesize[0] contains the size of each channel buffer.
870 * For packed audio, there is just one data pointer, and linesize[0]
871 * contains the total size of the buffer for all channels.
873 * Note: Both data and extended_data will always be set by get_buffer(),
874 * but for planar audio with more channels that can fit in data,
875 * extended_data must be used by the decoder in order to access all
879 * decoding: set by AVCodecContext.get_buffer()
881 uint8_t **extended_data;
884 * width and height of the video frame
886 * - decoding: Read by user.
891 * number of audio samples (per channel) described by this frame
892 * - encoding: Set by user
893 * - decoding: Set by libavcodec
898 * format of the frame, -1 if unknown or unset
899 * Values correspond to enum PixelFormat for video frames,
900 * enum AVSampleFormat for audio)
902 * - decoding: Read by user.
907 * 1 -> keyframe, 0-> not
908 * - encoding: Set by libavcodec.
909 * - decoding: Set by libavcodec.
914 * Picture type of the frame, see ?_TYPE below.
915 * - encoding: Set by libavcodec. for coded_picture (and set by user for input).
916 * - decoding: Set by libavcodec.
918 enum AVPictureType pict_type;
921 * pointer to the first allocated byte of the picture. Can be used in get_buffer/release_buffer.
922 * This isn't used by libavcodec unless the default get/release_buffer() is used.
926 uint8_t *base[AV_NUM_DATA_POINTERS];
929 * sample aspect ratio for the video frame, 0/1 if unknown\unspecified
931 * - decoding: Read by user.
933 AVRational sample_aspect_ratio;
936 * presentation timestamp in time_base units (time when frame should be shown to user)
937 * If AV_NOPTS_VALUE then frame_rate = 1/time_base will be assumed.
938 * - encoding: MUST be set by user.
939 * - decoding: Set by libavcodec.
944 * reordered pts from the last AVPacket that has been input into the decoder
946 * - decoding: Read by user.
951 * dts from the last AVPacket that has been input into the decoder
953 * - decoding: Read by user.
958 * picture number in bitstream order
960 * - decoding: Set by libavcodec.
962 int coded_picture_number;
964 * picture number in display order
966 * - decoding: Set by libavcodec.
968 int display_picture_number;
971 * quality (between 1 (good) and FF_LAMBDA_MAX (bad))
972 * - encoding: Set by libavcodec. for coded_picture (and set by user for input).
973 * - decoding: Set by libavcodec.
978 * is this picture used as reference
979 * The values for this are the same as the MpegEncContext.picture_structure
980 * variable, that is 1->top field, 2->bottom field, 3->frame/both fields.
981 * Set to 4 for delayed, non-reference frames.
983 * - decoding: Set by libavcodec. (before get_buffer() call)).
990 * - decoding: Set by libavcodec.
992 int8_t *qscale_table;
996 * - decoding: Set by libavcodec.
1006 * mbskip_table[mb]>=1 if MB didn't change
1007 * stride= mb_width = (width+15)>>4
1008 * - encoding: unused
1009 * - decoding: Set by libavcodec.
1011 uint8_t *mbskip_table;
1014 * motion vector table
1017 * int mv_sample_log2= 4 - motion_subsample_log2;
1018 * int mb_width= (width+15)>>4;
1019 * int mv_stride= (mb_width << mv_sample_log2) + 1;
1020 * motion_val[direction][x + y*mv_stride][0->mv_x, 1->mv_y];
1022 * - encoding: Set by user.
1023 * - decoding: Set by libavcodec.
1025 int16_t (*motion_val[2])[2];
1028 * macroblock type table
1029 * mb_type_base + mb_width + 2
1030 * - encoding: Set by user.
1031 * - decoding: Set by libavcodec.
1037 * - encoding: unused
1038 * - decoding: Set by libavcodec.
1043 * motion reference frame index
1044 * the order in which these are stored can depend on the codec.
1045 * - encoding: Set by user.
1046 * - decoding: Set by libavcodec.
1048 int8_t *ref_index[2];
1051 * for some private data of the user
1052 * - encoding: unused
1053 * - decoding: Set by user.
1059 * - encoding: Set by libavcodec. if flags&CODEC_FLAG_PSNR.
1060 * - decoding: unused
1062 uint64_t error[AV_NUM_DATA_POINTERS];
1065 * type of the buffer (to keep track of who has to deallocate data[*])
1066 * - encoding: Set by the one who allocates it.
1067 * - decoding: Set by the one who allocates it.
1068 * Note: User allocated (direct rendering) & internal buffers cannot coexist currently.
1073 * When decoding, this signals how much the picture must be delayed.
1074 * extra_delay = repeat_pict / (2*fps)
1075 * - encoding: unused
1076 * - decoding: Set by libavcodec.
1081 * The content of the picture is interlaced.
1082 * - encoding: Set by user.
1083 * - decoding: Set by libavcodec. (default 0)
1085 int interlaced_frame;
1088 * If the content is interlaced, is top field displayed first.
1089 * - encoding: Set by user.
1090 * - decoding: Set by libavcodec.
1092 int top_field_first;
1095 * Tell user application that palette has changed from previous frame.
1096 * - encoding: ??? (no palette-enabled encoder yet)
1097 * - decoding: Set by libavcodec. (default 0).
1099 int palette_has_changed;
1102 * codec suggestion on buffer type if != 0
1103 * - encoding: unused
1104 * - decoding: Set by libavcodec. (before get_buffer() call)).
1110 * - encoding: Set by user.
1111 * - decoding: Set by libavcodec.
1113 AVPanScan *pan_scan;
1116 * reordered opaque 64bit (generally an integer or a double precision float
1117 * PTS but can be anything).
1118 * The user sets AVCodecContext.reordered_opaque to represent the input at
1120 * the decoder reorders values as needed and sets AVFrame.reordered_opaque
1121 * to exactly one of the values provided by the user through AVCodecContext.reordered_opaque
1122 * @deprecated in favor of pkt_pts
1123 * - encoding: unused
1124 * - decoding: Read by user.
1126 int64_t reordered_opaque;
1129 * hardware accelerator private data (Libav-allocated)
1130 * - encoding: unused
1131 * - decoding: Set by libavcodec
1133 void *hwaccel_picture_private;
1136 * the AVCodecContext which ff_thread_get_buffer() was last called on
1137 * - encoding: Set by libavcodec.
1138 * - decoding: Set by libavcodec.
1140 struct AVCodecContext *owner;
1143 * used by multithreading to store frame-specific info
1144 * - encoding: Set by libavcodec.
1145 * - decoding: Set by libavcodec.
1147 void *thread_opaque;
1150 * log2 of the size of the block which a single vector in motion_val represents:
1151 * (4->16x16, 3->8x8, 2-> 4x4, 1-> 2x2)
1152 * - encoding: unused
1153 * - decoding: Set by libavcodec.
1155 uint8_t motion_subsample_log2;
1158 struct AVCodecInternal;
1162 AV_FIELD_PROGRESSIVE,
1163 AV_FIELD_TT, //< Top coded_first, top displayed first
1164 AV_FIELD_BB, //< Bottom coded first, bottom displayed first
1165 AV_FIELD_TB, //< Top coded first, bottom displayed first
1166 AV_FIELD_BT, //< Bottom coded first, top displayed first
1170 * main external API structure.
1171 * New fields can be added to the end with minor version bumps.
1172 * Removal, reordering and changes to existing fields require a major
1174 * sizeof(AVCodecContext) must not be used outside libav*.
1176 typedef struct AVCodecContext {
1178 * information on struct for av_log
1179 * - set by avcodec_alloc_context3
1181 const AVClass *av_class;
1182 int log_level_offset;
1184 enum AVMediaType codec_type; /* see AVMEDIA_TYPE_xxx */
1185 struct AVCodec *codec;
1186 char codec_name[32];
1187 enum CodecID codec_id; /* see CODEC_ID_xxx */
1190 * fourcc (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A').
1191 * This is used to work around some encoder bugs.
1192 * A demuxer should set this to what is stored in the field used to identify the codec.
1193 * If there are multiple such fields in a container then the demuxer should choose the one
1194 * which maximizes the information about the used codec.
1195 * If the codec tag field in a container is larger than 32 bits then the demuxer should
1196 * remap the longer ID to 32 bits with a table or other structure. Alternatively a new
1197 * extra_codec_tag + size could be added but for this a clear advantage must be demonstrated
1199 * - encoding: Set by user, if not then the default based on codec_id will be used.
1200 * - decoding: Set by user, will be converted to uppercase by libavcodec during init.
1202 unsigned int codec_tag;
1205 * fourcc from the AVI stream header (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A').
1206 * This is used to work around some encoder bugs.
1207 * - encoding: unused
1208 * - decoding: Set by user, will be converted to uppercase by libavcodec during init.
1210 unsigned int stream_codec_tag;
1213 * Some codecs need additional format info. It is stored here.
1214 * If any muxer uses this then ALL demuxers/parsers AND encoders for the
1215 * specific codec MUST set it correctly otherwise stream copy breaks.
1216 * In general use of this field by muxers is not recommended.
1217 * - encoding: Set by libavcodec.
1218 * - decoding: Set by libavcodec. (FIXME: Is this OK?)
1225 * Private context used for internal data.
1227 * Unlike priv_data, this is not codec-specific. It is used in general
1228 * libavcodec functions.
1230 struct AVCodecInternal *internal;
1233 * Private data of the user, can be used to carry app specific stuff.
1234 * - encoding: Set by user.
1235 * - decoding: Set by user.
1240 * the average bitrate
1241 * - encoding: Set by user; unused for constant quantizer encoding.
1242 * - decoding: Set by libavcodec. 0 or some bitrate if this info is available in the stream.
1247 * number of bits the bitstream is allowed to diverge from the reference.
1248 * the reference can be CBR (for CBR pass1) or VBR (for pass2)
1249 * - encoding: Set by user; unused for constant quantizer encoding.
1250 * - decoding: unused
1252 int bit_rate_tolerance;
1255 * Global quality for codecs which cannot change it per frame.
1256 * This should be proportional to MPEG-1/2/4 qscale.
1257 * - encoding: Set by user.
1258 * - decoding: unused
1263 * - encoding: Set by user.
1264 * - decoding: unused
1266 int compression_level;
1267 #define FF_COMPRESSION_DEFAULT -1
1271 * - encoding: Set by user.
1272 * - decoding: Set by user.
1278 * - encoding: Set by user.
1279 * - decoding: Set by user.
1284 * some codecs need / can use extradata like Huffman tables.
1285 * mjpeg: Huffman tables
1286 * rv10: additional flags
1287 * mpeg4: global headers (they can be in the bitstream or here)
1288 * The allocated memory should be FF_INPUT_BUFFER_PADDING_SIZE bytes larger
1289 * than extradata_size to avoid prolems if it is read with the bitstream reader.
1290 * The bytewise contents of extradata must not depend on the architecture or CPU endianness.
1291 * - encoding: Set/allocated/freed by libavcodec.
1292 * - decoding: Set/allocated/freed by user.
1298 * This is the fundamental unit of time (in seconds) in terms
1299 * of which frame timestamps are represented. For fixed-fps content,
1300 * timebase should be 1/framerate and timestamp increments should be
1302 * - encoding: MUST be set by user.
1303 * - decoding: Set by libavcodec.
1305 AVRational time_base;
1308 * For some codecs, the time base is closer to the field rate than the frame rate.
1309 * Most notably, H.264 and MPEG-2 specify time_base as half of frame duration
1310 * if no telecine is used ...
1312 * Set to time_base ticks per frame. Default 1, e.g., H.264/MPEG-2 set it to 2.
1314 int ticks_per_frame;
1320 * Number of frames the decoded output will be delayed relative to the
1324 * Number of "priming" samples added to the beginning of the stream
1325 * during encoding. The decoded output will be delayed by this many
1326 * samples relative to the input to the encoder. Note that this field is
1327 * purely informational and does not directly affect the pts output by
1328 * the encoder, which should always be based on the actual presentation
1329 * time, including any delay.
1331 * - encoding: Set by libavcodec.
1332 * - decoding: unused
1339 * picture width / height.
1340 * - encoding: MUST be set by user.
1341 * - decoding: Set by libavcodec.
1342 * Note: For compatibility it is possible to set this instead of
1343 * coded_width/height before decoding.
1348 * Bitstream width / height, may be different from width/height if lowres enabled.
1349 * - encoding: unused
1350 * - decoding: Set by user before init if known. Codec should override / dynamically change if needed.
1352 int coded_width, coded_height;
1354 #define FF_ASPECT_EXTENDED 15
1357 * the number of pictures in a group of pictures, or 0 for intra_only
1358 * - encoding: Set by user.
1359 * - decoding: unused
1364 * Pixel format, see PIX_FMT_xxx.
1365 * May be set by the demuxer if known from headers.
1366 * May be overriden by the decoder if it knows better.
1367 * - encoding: Set by user.
1368 * - decoding: Set by user if known, overridden by libavcodec if known
1370 enum PixelFormat pix_fmt;
1373 * Motion estimation algorithm used for video coding.
1374 * 1 (zero), 2 (full), 3 (log), 4 (phods), 5 (epzs), 6 (x1), 7 (hex),
1375 * 8 (umh), 9 (iter), 10 (tesa) [7, 8, 10 are x264 specific, 9 is snow specific]
1376 * - encoding: MUST be set by user.
1377 * - decoding: unused
1382 * If non NULL, 'draw_horiz_band' is called by the libavcodec
1383 * decoder to draw a horizontal band. It improves cache usage. Not
1384 * all codecs can do that. You must check the codec capabilities
1386 * When multithreading is used, it may be called from multiple threads
1387 * at the same time; threads might draw different parts of the same AVFrame,
1388 * or multiple AVFrames, and there is no guarantee that slices will be drawn
1390 * The function is also used by hardware acceleration APIs.
1391 * It is called at least once during frame decoding to pass
1392 * the data needed for hardware render.
1393 * In that mode instead of pixel data, AVFrame points to
1394 * a structure specific to the acceleration API. The application
1395 * reads the structure and can change some fields to indicate progress
1397 * - encoding: unused
1398 * - decoding: Set by user.
1399 * @param height the height of the slice
1400 * @param y the y position of the slice
1401 * @param type 1->top field, 2->bottom field, 3->frame
1402 * @param offset offset into the AVFrame.data from which the slice should be read
1404 void (*draw_horiz_band)(struct AVCodecContext *s,
1405 const AVFrame *src, int offset[AV_NUM_DATA_POINTERS],
1406 int y, int type, int height);
1409 * callback to negotiate the pixelFormat
1410 * @param fmt is the list of formats which are supported by the codec,
1411 * it is terminated by -1 as 0 is a valid format, the formats are ordered by quality.
1412 * The first is always the native one.
1413 * @return the chosen format
1414 * - encoding: unused
1415 * - decoding: Set by user, if not set the native format will be chosen.
1417 enum PixelFormat (*get_format)(struct AVCodecContext *s, const enum PixelFormat * fmt);
1420 * maximum number of B-frames between non-B-frames
1421 * Note: The output will be delayed by max_b_frames+1 relative to the input.
1422 * - encoding: Set by user.
1423 * - decoding: unused
1428 * qscale factor between IP and B-frames
1429 * If > 0 then the last P-frame quantizer will be used (q= lastp_q*factor+offset).
1430 * If < 0 then normal ratecontrol will be done (q= -normal_q*factor+offset).
1431 * - encoding: Set by user.
1432 * - decoding: unused
1434 float b_quant_factor;
1436 /** obsolete FIXME remove */
1438 #define FF_RC_STRATEGY_XVID 1
1440 int b_frame_strategy;
1442 #if FF_API_MPV_GLOBAL_OPTS
1444 * luma single coefficient elimination threshold
1445 * - encoding: Set by user.
1446 * - decoding: unused
1448 attribute_deprecated int luma_elim_threshold;
1451 * chroma single coeff elimination threshold
1452 * - encoding: Set by user.
1453 * - decoding: unused
1455 attribute_deprecated int chroma_elim_threshold;
1459 * qscale offset between IP and B-frames
1460 * - encoding: Set by user.
1461 * - decoding: unused
1463 float b_quant_offset;
1466 * Size of the frame reordering buffer in the decoder.
1467 * For MPEG-2 it is 1 IPB or 0 low delay IP.
1468 * - encoding: Set by libavcodec.
1469 * - decoding: Set by libavcodec.
1474 * 0-> h263 quant 1-> mpeg quant
1475 * - encoding: Set by user.
1476 * - decoding: unused
1481 * qscale factor between P and I-frames
1482 * If > 0 then the last p frame quantizer will be used (q= lastp_q*factor+offset).
1483 * If < 0 then normal ratecontrol will be done (q= -normal_q*factor+offset).
1484 * - encoding: Set by user.
1485 * - decoding: unused
1487 float i_quant_factor;
1490 * qscale offset between P and I-frames
1491 * - encoding: Set by user.
1492 * - decoding: unused
1494 float i_quant_offset;
1497 * luminance masking (0-> disabled)
1498 * - encoding: Set by user.
1499 * - decoding: unused
1504 * temporary complexity masking (0-> disabled)
1505 * - encoding: Set by user.
1506 * - decoding: unused
1508 float temporal_cplx_masking;
1511 * spatial complexity masking (0-> disabled)
1512 * - encoding: Set by user.
1513 * - decoding: unused
1515 float spatial_cplx_masking;
1518 * p block masking (0-> disabled)
1519 * - encoding: Set by user.
1520 * - decoding: unused
1525 * darkness masking (0-> disabled)
1526 * - encoding: Set by user.
1527 * - decoding: unused
1533 * - encoding: Set by libavcodec.
1534 * - decoding: Set by user (or 0).
1538 * prediction method (needed for huffyuv)
1539 * - encoding: Set by user.
1540 * - decoding: unused
1542 int prediction_method;
1543 #define FF_PRED_LEFT 0
1544 #define FF_PRED_PLANE 1
1545 #define FF_PRED_MEDIAN 2
1548 * slice offsets in the frame in bytes
1549 * - encoding: Set/allocated by libavcodec.
1550 * - decoding: Set/allocated by user (or NULL).
1555 * sample aspect ratio (0 if unknown)
1556 * That is the width of a pixel divided by the height of the pixel.
1557 * Numerator and denominator must be relatively prime and smaller than 256 for some video standards.
1558 * - encoding: Set by user.
1559 * - decoding: Set by libavcodec.
1561 AVRational sample_aspect_ratio;
1564 * motion estimation comparison function
1565 * - encoding: Set by user.
1566 * - decoding: unused
1570 * subpixel motion estimation comparison function
1571 * - encoding: Set by user.
1572 * - decoding: unused
1576 * macroblock comparison function (not supported yet)
1577 * - encoding: Set by user.
1578 * - decoding: unused
1582 * interlaced DCT comparison function
1583 * - encoding: Set by user.
1584 * - decoding: unused
1587 #define FF_CMP_SAD 0
1588 #define FF_CMP_SSE 1
1589 #define FF_CMP_SATD 2
1590 #define FF_CMP_DCT 3
1591 #define FF_CMP_PSNR 4
1592 #define FF_CMP_BIT 5
1594 #define FF_CMP_ZERO 7
1595 #define FF_CMP_VSAD 8
1596 #define FF_CMP_VSSE 9
1597 #define FF_CMP_NSSE 10
1598 #define FF_CMP_W53 11
1599 #define FF_CMP_W97 12
1600 #define FF_CMP_DCTMAX 13
1601 #define FF_CMP_DCT264 14
1602 #define FF_CMP_CHROMA 256
1605 * ME diamond size & shape
1606 * - encoding: Set by user.
1607 * - decoding: unused
1612 * amount of previous MV predictors (2a+1 x 2a+1 square)
1613 * - encoding: Set by user.
1614 * - decoding: unused
1616 int last_predictor_count;
1619 * prepass for motion estimation
1620 * - encoding: Set by user.
1621 * - decoding: unused
1626 * motion estimation prepass comparison function
1627 * - encoding: Set by user.
1628 * - decoding: unused
1633 * ME prepass diamond size & shape
1634 * - encoding: Set by user.
1635 * - decoding: unused
1641 * - encoding: Set by user.
1642 * - decoding: unused
1644 int me_subpel_quality;
1647 * DTG active format information (additional aspect ratio
1648 * information only used in DVB MPEG-2 transport streams)
1651 * - encoding: unused
1652 * - decoding: Set by decoder.
1654 int dtg_active_format;
1655 #define FF_DTG_AFD_SAME 8
1656 #define FF_DTG_AFD_4_3 9
1657 #define FF_DTG_AFD_16_9 10
1658 #define FF_DTG_AFD_14_9 11
1659 #define FF_DTG_AFD_4_3_SP_14_9 13
1660 #define FF_DTG_AFD_16_9_SP_14_9 14
1661 #define FF_DTG_AFD_SP_4_3 15
1664 * maximum motion estimation search range in subpel units
1665 * If 0 then no limit.
1667 * - encoding: Set by user.
1668 * - decoding: unused
1673 * intra quantizer bias
1674 * - encoding: Set by user.
1675 * - decoding: unused
1677 int intra_quant_bias;
1678 #define FF_DEFAULT_QUANT_BIAS 999999
1681 * inter quantizer bias
1682 * - encoding: Set by user.
1683 * - decoding: unused
1685 int inter_quant_bias;
1689 * - encoding: unused
1690 * - decoding: Which clrtable should be used for 8bit RGB images.
1691 * Tables have to be stored somewhere. FIXME
1697 * - encoding: unused
1698 * - decoding: Set by user.
1701 #define SLICE_FLAG_CODED_ORDER 0x0001 ///< draw_horiz_band() is called in coded order instead of display
1702 #define SLICE_FLAG_ALLOW_FIELD 0x0002 ///< allow draw_horiz_band() with field slices (MPEG2 field pics)
1703 #define SLICE_FLAG_ALLOW_PLANE 0x0004 ///< allow draw_horiz_band() with 1 component at a time (SVQ1)
1706 * XVideo Motion Acceleration
1707 * - encoding: forbidden
1708 * - decoding: set by decoder
1710 int xvmc_acceleration;
1713 * macroblock decision mode
1714 * - encoding: Set by user.
1715 * - decoding: unused
1718 #define FF_MB_DECISION_SIMPLE 0 ///< uses mb_cmp
1719 #define FF_MB_DECISION_BITS 1 ///< chooses the one which needs the fewest bits
1720 #define FF_MB_DECISION_RD 2 ///< rate distortion
1723 * custom intra quantization matrix
1724 * - encoding: Set by user, can be NULL.
1725 * - decoding: Set by libavcodec.
1727 uint16_t *intra_matrix;
1730 * custom inter quantization matrix
1731 * - encoding: Set by user, can be NULL.
1732 * - decoding: Set by libavcodec.
1734 uint16_t *inter_matrix;
1737 * scene change detection threshold
1738 * 0 is default, larger means fewer detected scene changes.
1739 * - encoding: Set by user.
1740 * - decoding: unused
1742 int scenechange_threshold;
1745 * noise reduction strength
1746 * - encoding: Set by user.
1747 * - decoding: unused
1749 int noise_reduction;
1753 * - encoding: Set by user.
1754 * - decoding: unused
1756 int inter_threshold;
1759 * quantizer noise shaping
1760 * - encoding: Set by user.
1761 * - decoding: unused
1763 int quantizer_noise_shaping;
1766 * Motion estimation threshold below which no motion estimation is
1767 * performed, but instead the user specified motion vectors are used.
1769 * - encoding: Set by user.
1770 * - decoding: unused
1775 * Macroblock threshold below which the user specified macroblock types will be used.
1776 * - encoding: Set by user.
1777 * - decoding: unused
1782 * precision of the intra DC coefficient - 8
1783 * - encoding: Set by user.
1784 * - decoding: unused
1786 int intra_dc_precision;
1789 * Number of macroblock rows at the top which are skipped.
1790 * - encoding: unused
1791 * - decoding: Set by user.
1796 * Number of macroblock rows at the bottom which are skipped.
1797 * - encoding: unused
1798 * - decoding: Set by user.
1803 * Border processing masking, raises the quantizer for mbs on the borders
1805 * - encoding: Set by user.
1806 * - decoding: unused
1808 float border_masking;
1811 * minimum MB lagrange multipler
1812 * - encoding: Set by user.
1813 * - decoding: unused
1818 * maximum MB lagrange multipler
1819 * - encoding: Set by user.
1820 * - decoding: unused
1826 * - encoding: Set by user.
1827 * - decoding: unused
1829 int me_penalty_compensation;
1833 * - encoding: Set by user.
1834 * - decoding: unused
1840 * - encoding: Set by user.
1841 * - decoding: unused
1847 * - encoding: Set by user.
1848 * - decoding: unused
1853 * number of reference frames
1854 * - encoding: Set by user.
1855 * - decoding: Set by lavc.
1860 * chroma qp offset from luma
1861 * - encoding: Set by user.
1862 * - decoding: unused
1867 * Multiplied by qscale for each frame and added to scene_change_score.
1868 * - encoding: Set by user.
1869 * - decoding: unused
1871 int scenechange_factor;
1875 * Note: Value depends upon the compare function used for fullpel ME.
1876 * - encoding: Set by user.
1877 * - decoding: unused
1882 * Adjust sensitivity of b_frame_strategy 1.
1883 * - encoding: Set by user.
1884 * - decoding: unused
1889 * Chromaticity coordinates of the source primaries.
1890 * - encoding: Set by user
1891 * - decoding: Set by libavcodec
1893 enum AVColorPrimaries color_primaries;
1896 * Color Transfer Characteristic.
1897 * - encoding: Set by user
1898 * - decoding: Set by libavcodec
1900 enum AVColorTransferCharacteristic color_trc;
1903 * YUV colorspace type.
1904 * - encoding: Set by user
1905 * - decoding: Set by libavcodec
1907 enum AVColorSpace colorspace;
1910 * MPEG vs JPEG YUV range.
1911 * - encoding: Set by user
1912 * - decoding: Set by libavcodec
1914 enum AVColorRange color_range;
1917 * This defines the location of chroma samples.
1918 * - encoding: Set by user
1919 * - decoding: Set by libavcodec
1921 enum AVChromaLocation chroma_sample_location;
1925 * Indicates number of picture subdivisions. Used for parallelized
1927 * - encoding: Set by user
1928 * - decoding: unused
1933 * - encoding: set by libavcodec
1934 * - decoding: Set by libavcodec
1936 enum AVFieldOrder field_order;
1939 int sample_rate; ///< samples per second
1940 int channels; ///< number of audio channels
1943 * audio sample format
1944 * - encoding: Set by user.
1945 * - decoding: Set by libavcodec.
1947 enum AVSampleFormat sample_fmt; ///< sample format
1949 /* The following data should not be initialized. */
1951 * Samples per packet, initialized when calling 'init'.
1954 int frame_number; ///< audio or video frame number
1957 * number of bytes per packet if constant and known or 0
1958 * Used by some WAV based audio codecs.
1963 * Audio cutoff bandwidth (0 means "automatic")
1964 * - encoding: Set by user.
1965 * - decoding: unused
1969 #if FF_API_REQUEST_CHANNELS
1971 * Decoder should decode to this many channels if it can (0 for default)
1972 * - encoding: unused
1973 * - decoding: Set by user.
1974 * @deprecated Deprecated in favor of request_channel_layout.
1976 int request_channels;
1980 * Audio channel layout.
1981 * - encoding: set by user.
1982 * - decoding: set by libavcodec.
1984 uint64_t channel_layout;
1987 * Request decoder to use this channel layout if it can (0 for default)
1988 * - encoding: unused
1989 * - decoding: Set by user.
1991 uint64_t request_channel_layout;
1994 * Type of service that the audio stream conveys.
1995 * - encoding: Set by user.
1996 * - decoding: Set by libavcodec.
1998 enum AVAudioServiceType audio_service_type;
2001 * Used to request a sample format from the decoder.
2002 * - encoding: unused.
2003 * - decoding: Set by user.
2005 enum AVSampleFormat request_sample_fmt;
2008 * Called at the beginning of each frame to get a buffer for it.
2010 * The function will set AVFrame.data[], AVFrame.linesize[].
2011 * AVFrame.extended_data[] must also be set, but it should be the same as
2012 * AVFrame.data[] except for planar audio with more channels than can fit
2013 * in AVFrame.data[]. In that case, AVFrame.data[] shall still contain as
2014 * many data pointers as it can hold.
2016 * if CODEC_CAP_DR1 is not set then get_buffer() must call
2017 * avcodec_default_get_buffer() instead of providing buffers allocated by
2020 * AVFrame.data[] should be 32- or 16-byte-aligned unless the CPU doesn't
2021 * need it. avcodec_default_get_buffer() aligns the output buffer properly,
2022 * but if get_buffer() is overridden then alignment considerations should
2023 * be taken into account.
2025 * @see avcodec_default_get_buffer()
2029 * If pic.reference is set then the frame will be read later by libavcodec.
2030 * avcodec_align_dimensions2() should be used to find the required width and
2031 * height, as they normally need to be rounded up to the next multiple of 16.
2033 * If frame multithreading is used and thread_safe_callbacks is set,
2034 * it may be called from a different thread, but not from more than one at
2035 * once. Does not need to be reentrant.
2037 * @see release_buffer(), reget_buffer()
2038 * @see avcodec_align_dimensions2()
2042 * Decoders request a buffer of a particular size by setting
2043 * AVFrame.nb_samples prior to calling get_buffer(). The decoder may,
2044 * however, utilize only part of the buffer by setting AVFrame.nb_samples
2045 * to a smaller value in the output frame.
2047 * Decoders cannot use the buffer after returning from
2048 * avcodec_decode_audio4(), so they will not call release_buffer(), as it
2049 * is assumed to be released immediately upon return.
2051 * As a convenience, av_samples_get_buffer_size() and
2052 * av_samples_fill_arrays() in libavutil may be used by custom get_buffer()
2053 * functions to find the required data size and to fill data pointers and
2054 * linesize. In AVFrame.linesize, only linesize[0] may be set for audio
2055 * since all planes must be the same size.
2057 * @see av_samples_get_buffer_size(), av_samples_fill_arrays()
2059 * - encoding: unused
2060 * - decoding: Set by libavcodec, user can override.
2062 int (*get_buffer)(struct AVCodecContext *c, AVFrame *pic);
2065 * Called to release buffers which were allocated with get_buffer.
2066 * A released buffer can be reused in get_buffer().
2067 * pic.data[*] must be set to NULL.
2068 * May be called from a different thread if frame multithreading is used,
2069 * but not by more than one thread at once, so does not need to be reentrant.
2070 * - encoding: unused
2071 * - decoding: Set by libavcodec, user can override.
2073 void (*release_buffer)(struct AVCodecContext *c, AVFrame *pic);
2076 * Called at the beginning of a frame to get cr buffer for it.
2077 * Buffer type (size, hints) must be the same. libavcodec won't check it.
2078 * libavcodec will pass previous buffer in pic, function should return
2079 * same buffer or new buffer with old frame "painted" into it.
2080 * If pic.data[0] == NULL must behave like get_buffer().
2081 * if CODEC_CAP_DR1 is not set then reget_buffer() must call
2082 * avcodec_default_reget_buffer() instead of providing buffers allocated by
2084 * - encoding: unused
2085 * - decoding: Set by libavcodec, user can override.
2087 int (*reget_buffer)(struct AVCodecContext *c, AVFrame *pic);
2090 /* - encoding parameters */
2091 float qcompress; ///< amount of qscale change between easy & hard scenes (0.0-1.0)
2092 float qblur; ///< amount of qscale smoothing over time (0.0-1.0)
2096 * - encoding: Set by user.
2097 * - decoding: unused
2103 * - encoding: Set by user.
2104 * - decoding: unused
2109 * maximum quantizer difference between frames
2110 * - encoding: Set by user.
2111 * - decoding: unused
2116 * ratecontrol qmin qmax limiting method
2117 * 0-> clipping, 1-> use a nice continous function to limit qscale wthin qmin/qmax.
2118 * - encoding: Set by user.
2119 * - decoding: unused
2127 * decoder bitstream buffer size
2128 * - encoding: Set by user.
2129 * - decoding: unused
2134 * ratecontrol override, see RcOverride
2135 * - encoding: Allocated/set/freed by user.
2136 * - decoding: unused
2138 int rc_override_count;
2139 RcOverride *rc_override;
2142 * rate control equation
2143 * - encoding: Set by user
2144 * - decoding: unused
2150 * - encoding: Set by user.
2151 * - decoding: unused
2157 * - encoding: Set by user.
2158 * - decoding: unused
2162 float rc_buffer_aggressivity;
2165 * initial complexity for pass1 ratecontrol
2166 * - encoding: Set by user.
2167 * - decoding: unused
2169 float rc_initial_cplx;
2172 * Ratecontrol attempt to use, at maximum, <value> of what can be used without an underflow.
2173 * - encoding: Set by user.
2174 * - decoding: unused.
2176 float rc_max_available_vbv_use;
2179 * Ratecontrol attempt to use, at least, <value> times the amount needed to prevent a vbv overflow.
2180 * - encoding: Set by user.
2181 * - decoding: unused.
2183 float rc_min_vbv_overflow_use;
2186 * Number of bits which should be loaded into the rc buffer before decoding starts.
2187 * - encoding: Set by user.
2188 * - decoding: unused
2190 int rc_initial_buffer_occupancy;
2192 #define FF_CODER_TYPE_VLC 0
2193 #define FF_CODER_TYPE_AC 1
2194 #define FF_CODER_TYPE_RAW 2
2195 #define FF_CODER_TYPE_RLE 3
2196 #define FF_CODER_TYPE_DEFLATE 4
2199 * - encoding: Set by user.
2200 * - decoding: unused
2206 * - encoding: Set by user.
2207 * - decoding: unused
2212 * minimum Lagrange multipler
2213 * - encoding: Set by user.
2214 * - decoding: unused
2219 * maximum Lagrange multipler
2220 * - encoding: Set by user.
2221 * - decoding: unused
2226 * frame skip threshold
2227 * - encoding: Set by user.
2228 * - decoding: unused
2230 int frame_skip_threshold;
2234 * - encoding: Set by user.
2235 * - decoding: unused
2237 int frame_skip_factor;
2240 * frame skip exponent
2241 * - encoding: Set by user.
2242 * - decoding: unused
2247 * frame skip comparison function
2248 * - encoding: Set by user.
2249 * - decoding: unused
2254 * trellis RD quantization
2255 * - encoding: Set by user.
2256 * - decoding: unused
2261 * - encoding: Set by user.
2262 * - decoding: unused
2264 int min_prediction_order;
2267 * - encoding: Set by user.
2268 * - decoding: unused
2270 int max_prediction_order;
2273 * GOP timecode frame start number, in non drop frame format
2274 * - encoding: Set by user.
2275 * - decoding: unused
2277 int64_t timecode_frame_start;
2279 /* The RTP callback: This function is called */
2280 /* every time the encoder has a packet to send. */
2281 /* It depends on the encoder if the data starts */
2282 /* with a Start Code (it should). H.263 does. */
2283 /* mb_nb contains the number of macroblocks */
2284 /* encoded in the RTP payload. */
2285 void (*rtp_callback)(struct AVCodecContext *avctx, void *data, int size, int mb_nb);
2287 int rtp_payload_size; /* The size of the RTP payload: the coder will */
2288 /* do its best to deliver a chunk with size */
2289 /* below rtp_payload_size, the chunk will start */
2290 /* with a start code on some codecs like H.263. */
2291 /* This doesn't take account of any particular */
2292 /* headers inside the transmitted RTP payload. */
2294 /* statistics, used for 2-pass encoding */
2305 * number of bits used for the previously encoded frame
2306 * - encoding: Set by libavcodec.
2307 * - decoding: unused
2312 * pass1 encoding statistics output buffer
2313 * - encoding: Set by libavcodec.
2314 * - decoding: unused
2319 * pass2 encoding statistics input buffer
2320 * Concatenated stuff from stats_out of pass1 should be placed here.
2321 * - encoding: Allocated/set/freed by user.
2322 * - decoding: unused
2327 * Work around bugs in encoders which sometimes cannot be detected automatically.
2328 * - encoding: Set by user
2329 * - decoding: Set by user
2331 int workaround_bugs;
2332 #define FF_BUG_AUTODETECT 1 ///< autodetection
2333 #define FF_BUG_OLD_MSMPEG4 2
2334 #define FF_BUG_XVID_ILACE 4
2335 #define FF_BUG_UMP4 8
2336 #define FF_BUG_NO_PADDING 16
2337 #define FF_BUG_AMV 32
2338 #define FF_BUG_AC_VLC 0 ///< Will be removed, libavcodec can now handle these non-compliant files by default.
2339 #define FF_BUG_QPEL_CHROMA 64
2340 #define FF_BUG_STD_QPEL 128
2341 #define FF_BUG_QPEL_CHROMA2 256
2342 #define FF_BUG_DIRECT_BLOCKSIZE 512
2343 #define FF_BUG_EDGE 1024
2344 #define FF_BUG_HPEL_CHROMA 2048
2345 #define FF_BUG_DC_CLIP 4096
2346 #define FF_BUG_MS 8192 ///< Work around various bugs in Microsoft's broken decoders.
2347 #define FF_BUG_TRUNCATED 16384
2350 * strictly follow the standard (MPEG4, ...).
2351 * - encoding: Set by user.
2352 * - decoding: Set by user.
2353 * Setting this to STRICT or higher means the encoder and decoder will
2354 * generally do stupid things, whereas setting it to unofficial or lower
2355 * will mean the encoder might produce output that is not supported by all
2356 * spec-compliant decoders. Decoders don't differentiate between normal,
2357 * unofficial and experimental (that is, they always try to decode things
2358 * when they can) unless they are explicitly asked to behave stupidly
2359 * (=strictly conform to the specs)
2361 int strict_std_compliance;
2362 #define FF_COMPLIANCE_VERY_STRICT 2 ///< Strictly conform to an older more strict version of the spec or reference software.
2363 #define FF_COMPLIANCE_STRICT 1 ///< Strictly conform to all the things in the spec no matter what consequences.
2364 #define FF_COMPLIANCE_NORMAL 0
2365 #define FF_COMPLIANCE_UNOFFICIAL -1 ///< Allow unofficial extensions
2366 #define FF_COMPLIANCE_EXPERIMENTAL -2 ///< Allow nonstandardized experimental things.
2369 * error concealment flags
2370 * - encoding: unused
2371 * - decoding: Set by user.
2373 int error_concealment;
2374 #define FF_EC_GUESS_MVS 1
2375 #define FF_EC_DEBLOCK 2
2379 * - encoding: Set by user.
2380 * - decoding: Set by user.
2383 #define FF_DEBUG_PICT_INFO 1
2384 #define FF_DEBUG_RC 2
2385 #define FF_DEBUG_BITSTREAM 4
2386 #define FF_DEBUG_MB_TYPE 8
2387 #define FF_DEBUG_QP 16
2388 #define FF_DEBUG_MV 32
2389 #define FF_DEBUG_DCT_COEFF 0x00000040
2390 #define FF_DEBUG_SKIP 0x00000080
2391 #define FF_DEBUG_STARTCODE 0x00000100
2392 #define FF_DEBUG_PTS 0x00000200
2393 #define FF_DEBUG_ER 0x00000400
2394 #define FF_DEBUG_MMCO 0x00000800
2395 #define FF_DEBUG_BUGS 0x00001000
2396 #define FF_DEBUG_VIS_QP 0x00002000
2397 #define FF_DEBUG_VIS_MB_TYPE 0x00004000
2398 #define FF_DEBUG_BUFFERS 0x00008000
2399 #define FF_DEBUG_THREADS 0x00010000
2403 * - encoding: Set by user.
2404 * - decoding: Set by user.
2407 #define FF_DEBUG_VIS_MV_P_FOR 0x00000001 //visualize forward predicted MVs of P frames
2408 #define FF_DEBUG_VIS_MV_B_FOR 0x00000002 //visualize forward predicted MVs of B frames
2409 #define FF_DEBUG_VIS_MV_B_BACK 0x00000004 //visualize backward predicted MVs of B frames
2412 * Error recognition; may misdetect some more or less valid parts as errors.
2413 * - encoding: unused
2414 * - decoding: Set by user.
2416 int err_recognition;
2417 #define AV_EF_CRCCHECK (1<<0)
2418 #define AV_EF_BITSTREAM (1<<1)
2419 #define AV_EF_BUFFER (1<<2)
2420 #define AV_EF_EXPLODE (1<<3)
2423 * opaque 64bit number (generally a PTS) that will be reordered and
2424 * output in AVFrame.reordered_opaque
2425 * @deprecated in favor of pkt_pts
2426 * - encoding: unused
2427 * - decoding: Set by user.
2429 int64_t reordered_opaque;
2432 * Hardware accelerator in use
2433 * - encoding: unused.
2434 * - decoding: Set by libavcodec
2436 struct AVHWAccel *hwaccel;
2439 * Hardware accelerator context.
2440 * For some hardware accelerators, a global context needs to be
2441 * provided by the user. In that case, this holds display-dependent
2442 * data Libav cannot instantiate itself. Please refer to the
2443 * Libav HW accelerator documentation to know how to fill this
2444 * is. e.g. for VA API, this is a struct vaapi_context.
2445 * - encoding: unused
2446 * - decoding: Set by user
2448 void *hwaccel_context;
2452 * - encoding: Set by libavcodec if flags&CODEC_FLAG_PSNR.
2453 * - decoding: unused
2455 uint64_t error[AV_NUM_DATA_POINTERS];
2458 * DCT algorithm, see FF_DCT_* below
2459 * - encoding: Set by user.
2460 * - decoding: unused
2463 #define FF_DCT_AUTO 0
2464 #define FF_DCT_FASTINT 1
2465 #define FF_DCT_INT 2
2466 #define FF_DCT_MMX 3
2467 #define FF_DCT_ALTIVEC 5
2468 #define FF_DCT_FAAN 6
2471 * IDCT algorithm, see FF_IDCT_* below.
2472 * - encoding: Set by user.
2473 * - decoding: Set by user.
2476 #define FF_IDCT_AUTO 0
2477 #define FF_IDCT_INT 1
2478 #define FF_IDCT_SIMPLE 2
2479 #define FF_IDCT_SIMPLEMMX 3
2480 #define FF_IDCT_LIBMPEG2MMX 4
2481 #define FF_IDCT_MMI 5
2482 #define FF_IDCT_ARM 7
2483 #define FF_IDCT_ALTIVEC 8
2484 #define FF_IDCT_SH4 9
2485 #define FF_IDCT_SIMPLEARM 10
2486 #define FF_IDCT_H264 11
2487 #define FF_IDCT_VP3 12
2488 #define FF_IDCT_IPP 13
2489 #define FF_IDCT_XVIDMMX 14
2490 #define FF_IDCT_CAVS 15
2491 #define FF_IDCT_SIMPLEARMV5TE 16
2492 #define FF_IDCT_SIMPLEARMV6 17
2493 #define FF_IDCT_SIMPLEVIS 18
2494 #define FF_IDCT_WMV2 19
2495 #define FF_IDCT_FAAN 20
2496 #define FF_IDCT_EA 21
2497 #define FF_IDCT_SIMPLENEON 22
2498 #define FF_IDCT_SIMPLEALPHA 23
2499 #define FF_IDCT_BINK 24
2502 * dsp_mask could be add used to disable unwanted CPU features
2503 * CPU features (i.e. MMX, SSE. ...)
2505 * With the FORCE flag you may instead enable given CPU features.
2506 * (Dangerous: Usable in case of misdetection, improper usage however will
2507 * result into program crash.)
2512 * bits per sample/pixel from the demuxer (needed for huffyuv).
2513 * - encoding: Set by libavcodec.
2514 * - decoding: Set by user.
2516 int bits_per_coded_sample;
2519 * Bits per sample/pixel of internal libavcodec pixel/sample format.
2520 * - encoding: set by user.
2521 * - decoding: set by libavcodec.
2523 int bits_per_raw_sample;
2526 * low resolution decoding, 1-> 1/2 size, 2->1/4 size
2527 * - encoding: unused
2528 * - decoding: Set by user.
2533 * the picture in the bitstream
2534 * - encoding: Set by libavcodec.
2535 * - decoding: Set by libavcodec.
2537 AVFrame *coded_frame;
2541 * is used to decide how many independent tasks should be passed to execute()
2542 * - encoding: Set by user.
2543 * - decoding: Set by user.
2548 * Which multithreading methods to use.
2549 * Use of FF_THREAD_FRAME will increase decoding delay by one frame per thread,
2550 * so clients which cannot provide future frames should not use it.
2552 * - encoding: Set by user, otherwise the default is used.
2553 * - decoding: Set by user, otherwise the default is used.
2556 #define FF_THREAD_FRAME 1 ///< Decode more than one frame at once
2557 #define FF_THREAD_SLICE 2 ///< Decode more than one part of a single frame at once
2560 * Which multithreading methods are in use by the codec.
2561 * - encoding: Set by libavcodec.
2562 * - decoding: Set by libavcodec.
2564 int active_thread_type;
2567 * Set by the client if its custom get_buffer() callback can be called
2568 * from another thread, which allows faster multithreaded decoding.
2569 * draw_horiz_band() will be called from other threads regardless of this setting.
2570 * Ignored if the default get_buffer() is used.
2571 * - encoding: Set by user.
2572 * - decoding: Set by user.
2574 int thread_safe_callbacks;
2577 * The codec may call this to execute several independent things.
2578 * It will return only after finishing all tasks.
2579 * The user may replace this with some multithreaded implementation,
2580 * the default implementation will execute the parts serially.
2581 * @param count the number of things to execute
2582 * - encoding: Set by libavcodec, user can override.
2583 * - decoding: Set by libavcodec, user can override.
2585 int (*execute)(struct AVCodecContext *c, int (*func)(struct AVCodecContext *c2, void *arg), void *arg2, int *ret, int count, int size);
2588 * The codec may call this to execute several independent things.
2589 * It will return only after finishing all tasks.
2590 * The user may replace this with some multithreaded implementation,
2591 * the default implementation will execute the parts serially.
2592 * Also see avcodec_thread_init and e.g. the --enable-pthread configure option.
2593 * @param c context passed also to func
2594 * @param count the number of things to execute
2595 * @param arg2 argument passed unchanged to func
2596 * @param ret return values of executed functions, must have space for "count" values. May be NULL.
2597 * @param func function that will be called count times, with jobnr from 0 to count-1.
2598 * threadnr will be in the range 0 to c->thread_count-1 < MAX_THREADS and so that no
2599 * two instances of func executing at the same time will have the same threadnr.
2600 * @return always 0 currently, but code should handle a future improvement where when any call to func
2601 * returns < 0 no further calls to func may be done and < 0 is returned.
2602 * - encoding: Set by libavcodec, user can override.
2603 * - decoding: Set by libavcodec, user can override.
2605 int (*execute2)(struct AVCodecContext *c, int (*func)(struct AVCodecContext *c2, void *arg, int jobnr, int threadnr), void *arg2, int *ret, int count);
2609 * Can be used by execute() to store some per AVCodecContext stuff.
2610 * - encoding: set by execute()
2611 * - decoding: set by execute()
2613 void *thread_opaque;
2616 * noise vs. sse weight for the nsse comparsion function
2617 * - encoding: Set by user.
2618 * - decoding: unused
2624 * - encoding: Set by user.
2625 * - decoding: Set by libavcodec.
2628 #define FF_PROFILE_UNKNOWN -99
2629 #define FF_PROFILE_RESERVED -100
2631 #define FF_PROFILE_AAC_MAIN 0
2632 #define FF_PROFILE_AAC_LOW 1
2633 #define FF_PROFILE_AAC_SSR 2
2634 #define FF_PROFILE_AAC_LTP 3
2636 #define FF_PROFILE_DTS 20
2637 #define FF_PROFILE_DTS_ES 30
2638 #define FF_PROFILE_DTS_96_24 40
2639 #define FF_PROFILE_DTS_HD_HRA 50
2640 #define FF_PROFILE_DTS_HD_MA 60
2642 #define FF_PROFILE_MPEG2_422 0
2643 #define FF_PROFILE_MPEG2_HIGH 1
2644 #define FF_PROFILE_MPEG2_SS 2
2645 #define FF_PROFILE_MPEG2_SNR_SCALABLE 3
2646 #define FF_PROFILE_MPEG2_MAIN 4
2647 #define FF_PROFILE_MPEG2_SIMPLE 5
2649 #define FF_PROFILE_H264_CONSTRAINED (1<<9) // 8+1; constraint_set1_flag
2650 #define FF_PROFILE_H264_INTRA (1<<11) // 8+3; constraint_set3_flag
2652 #define FF_PROFILE_H264_BASELINE 66
2653 #define FF_PROFILE_H264_CONSTRAINED_BASELINE (66|FF_PROFILE_H264_CONSTRAINED)
2654 #define FF_PROFILE_H264_MAIN 77
2655 #define FF_PROFILE_H264_EXTENDED 88
2656 #define FF_PROFILE_H264_HIGH 100
2657 #define FF_PROFILE_H264_HIGH_10 110
2658 #define FF_PROFILE_H264_HIGH_10_INTRA (110|FF_PROFILE_H264_INTRA)
2659 #define FF_PROFILE_H264_HIGH_422 122
2660 #define FF_PROFILE_H264_HIGH_422_INTRA (122|FF_PROFILE_H264_INTRA)
2661 #define FF_PROFILE_H264_HIGH_444 144
2662 #define FF_PROFILE_H264_HIGH_444_PREDICTIVE 244
2663 #define FF_PROFILE_H264_HIGH_444_INTRA (244|FF_PROFILE_H264_INTRA)
2664 #define FF_PROFILE_H264_CAVLC_444 44
2666 #define FF_PROFILE_VC1_SIMPLE 0
2667 #define FF_PROFILE_VC1_MAIN 1
2668 #define FF_PROFILE_VC1_COMPLEX 2
2669 #define FF_PROFILE_VC1_ADVANCED 3
2671 #define FF_PROFILE_MPEG4_SIMPLE 0
2672 #define FF_PROFILE_MPEG4_SIMPLE_SCALABLE 1
2673 #define FF_PROFILE_MPEG4_CORE 2
2674 #define FF_PROFILE_MPEG4_MAIN 3
2675 #define FF_PROFILE_MPEG4_N_BIT 4
2676 #define FF_PROFILE_MPEG4_SCALABLE_TEXTURE 5
2677 #define FF_PROFILE_MPEG4_SIMPLE_FACE_ANIMATION 6
2678 #define FF_PROFILE_MPEG4_BASIC_ANIMATED_TEXTURE 7
2679 #define FF_PROFILE_MPEG4_HYBRID 8
2680 #define FF_PROFILE_MPEG4_ADVANCED_REAL_TIME 9
2681 #define FF_PROFILE_MPEG4_CORE_SCALABLE 10
2682 #define FF_PROFILE_MPEG4_ADVANCED_CODING 11
2683 #define FF_PROFILE_MPEG4_ADVANCED_CORE 12
2684 #define FF_PROFILE_MPEG4_ADVANCED_SCALABLE_TEXTURE 13
2685 #define FF_PROFILE_MPEG4_SIMPLE_STUDIO 14
2686 #define FF_PROFILE_MPEG4_ADVANCED_SIMPLE 15
2690 * - encoding: Set by user.
2691 * - decoding: Set by libavcodec.
2694 #define FF_LEVEL_UNKNOWN -99
2698 * - encoding: unused
2699 * - decoding: Set by user.
2701 enum AVDiscard skip_loop_filter;
2705 * - encoding: unused
2706 * - decoding: Set by user.
2708 enum AVDiscard skip_idct;
2712 * - encoding: unused
2713 * - decoding: Set by user.
2715 enum AVDiscard skip_frame;
2718 * Header containing style information for text subtitles.
2719 * For SUBTITLE_ASS subtitle type, it should contain the whole ASS
2720 * [Script Info] and [V4+ Styles] section, plus the [Events] line and
2721 * the Format line following. It shouldn't include any Dialogue line.
2722 * - encoding: Set/allocated/freed by user (before avcodec_open2())
2723 * - decoding: Set/allocated/freed by libavcodec (by avcodec_open2())
2725 uint8_t *subtitle_header;
2726 int subtitle_header_size;
2729 * Simulates errors in the bitstream to test error concealment.
2730 * - encoding: Set by user.
2731 * - decoding: unused
2736 * Current packet as passed into the decoder, to avoid having
2737 * to pass the packet into every function. Currently only valid
2738 * inside lavc and get/release_buffer callbacks.
2739 * - decoding: set by avcodec_decode_*, read by get_buffer() for setting pkt_pts
2740 * - encoding: unused
2745 * VBV delay coded in the last frame (in periods of a 27 MHz clock).
2746 * Used for compliant TS muxing.
2747 * - encoding: Set by libavcodec.
2748 * - decoding: unused.
2756 typedef struct AVProfile {
2758 const char *name; ///< short name for the profile
2761 typedef struct AVCodecDefault AVCodecDefault;
2766 typedef struct AVCodec {
2768 * Name of the codec implementation.
2769 * The name is globally unique among encoders and among decoders (but an
2770 * encoder and a decoder can share the same name).
2771 * This is the primary way to find a codec from the user perspective.
2775 * Descriptive name for the codec, meant to be more human readable than name.
2776 * You should use the NULL_IF_CONFIG_SMALL() macro to define it.
2778 const char *long_name;
2779 enum AVMediaType type;
2782 * Codec capabilities.
2786 const AVRational *supported_framerates; ///< array of supported framerates, or NULL if any, array is terminated by {0,0}
2787 const enum PixelFormat *pix_fmts; ///< array of supported pixel formats, or NULL if unknown, array is terminated by -1
2788 const int *supported_samplerates; ///< array of supported audio samplerates, or NULL if unknown, array is terminated by 0
2789 const enum AVSampleFormat *sample_fmts; ///< array of supported sample formats, or NULL if unknown, array is terminated by -1
2790 const uint64_t *channel_layouts; ///< array of support channel layouts, or NULL if unknown. array is terminated by 0
2791 uint8_t max_lowres; ///< maximum value for lowres supported by the decoder
2792 const AVClass *priv_class; ///< AVClass for the private context
2793 const AVProfile *profiles; ///< array of recognized profiles, or NULL if unknown, array is terminated by {FF_PROFILE_UNKNOWN}
2795 /*****************************************************************
2796 * No fields below this line are part of the public API. They
2797 * may not be used outside of libavcodec and can be changed and
2799 * New public fields should be added right above.
2800 *****************************************************************
2803 struct AVCodec *next;
2805 * @name Frame-level threading support functions
2809 * If defined, called on thread contexts when they are created.
2810 * If the codec allocates writable tables in init(), re-allocate them here.
2811 * priv_data will be set to a copy of the original.
2813 int (*init_thread_copy)(AVCodecContext *);
2815 * Copy necessary context variables from a previous thread context to the current one.
2816 * If not defined, the next thread will start automatically; otherwise, the codec
2817 * must call ff_thread_finish_setup().
2819 * dst and src will (rarely) point to the same context, in which case memcpy should be skipped.
2821 int (*update_thread_context)(AVCodecContext *dst, const AVCodecContext *src);
2825 * Private codec-specific defaults.
2827 const AVCodecDefault *defaults;
2830 * Initialize codec static data, called from avcodec_register().
2832 void (*init_static_data)(struct AVCodec *codec);
2834 int (*init)(AVCodecContext *);
2835 int (*encode)(AVCodecContext *, uint8_t *buf, int buf_size, void *data);
2837 * Encode data to an AVPacket.
2839 * @param avctx codec context
2840 * @param avpkt output AVPacket (may contain a user-provided buffer)
2841 * @param[in] frame AVFrame containing the raw data to be encoded
2842 * @param[out] got_packet_ptr encoder sets to 0 or 1 to indicate that a
2843 * non-empty packet was returned in avpkt.
2844 * @return 0 on success, negative error code on failure
2846 int (*encode2)(AVCodecContext *avctx, AVPacket *avpkt, const AVFrame *frame,
2847 int *got_packet_ptr);
2848 int (*decode)(AVCodecContext *, void *outdata, int *outdata_size, AVPacket *avpkt);
2849 int (*close)(AVCodecContext *);
2852 * Will be called when seeking
2854 void (*flush)(AVCodecContext *);
2860 typedef struct AVHWAccel {
2862 * Name of the hardware accelerated codec.
2863 * The name is globally unique among encoders and among decoders (but an
2864 * encoder and a decoder can share the same name).
2869 * Type of codec implemented by the hardware accelerator.
2871 * See AVMEDIA_TYPE_xxx
2873 enum AVMediaType type;
2876 * Codec implemented by the hardware accelerator.
2883 * Supported pixel format.
2885 * Only hardware accelerated formats are supported here.
2887 enum PixelFormat pix_fmt;
2890 * Hardware accelerated codec capabilities.
2891 * see FF_HWACCEL_CODEC_CAP_*
2895 struct AVHWAccel *next;
2898 * Called at the beginning of each frame or field picture.
2900 * Meaningful frame information (codec specific) is guaranteed to
2901 * be parsed at this point. This function is mandatory.
2903 * Note that buf can be NULL along with buf_size set to 0.
2904 * Otherwise, this means the whole frame is available at this point.
2906 * @param avctx the codec context
2907 * @param buf the frame data buffer base
2908 * @param buf_size the size of the frame in bytes
2909 * @return zero if successful, a negative value otherwise
2911 int (*start_frame)(AVCodecContext *avctx, const uint8_t *buf, uint32_t buf_size);
2914 * Callback for each slice.
2916 * Meaningful slice information (codec specific) is guaranteed to
2917 * be parsed at this point. This function is mandatory.
2919 * @param avctx the codec context
2920 * @param buf the slice data buffer base
2921 * @param buf_size the size of the slice in bytes
2922 * @return zero if successful, a negative value otherwise
2924 int (*decode_slice)(AVCodecContext *avctx, const uint8_t *buf, uint32_t buf_size);
2927 * Called at the end of each frame or field picture.
2929 * The whole picture is parsed at this point and can now be sent
2930 * to the hardware accelerator. This function is mandatory.
2932 * @param avctx the codec context
2933 * @return zero if successful, a negative value otherwise
2935 int (*end_frame)(AVCodecContext *avctx);
2938 * Size of HW accelerator private data.
2940 * Private data is allocated with av_mallocz() before
2941 * AVCodecContext.get_buffer() and deallocated after
2942 * AVCodecContext.release_buffer().
2948 * four components are given, that's all.
2949 * the last component is alpha
2951 typedef struct AVPicture {
2952 uint8_t *data[AV_NUM_DATA_POINTERS];
2953 int linesize[AV_NUM_DATA_POINTERS]; ///< number of bytes per line
2956 #define AVPALETTE_SIZE 1024
2957 #define AVPALETTE_COUNT 256
2959 enum AVSubtitleType {
2962 SUBTITLE_BITMAP, ///< A bitmap, pict will be set
2965 * Plain text, the text field must be set by the decoder and is
2966 * authoritative. ass and pict fields may contain approximations.
2971 * Formatted text, the ass field must be set by the decoder and is
2972 * authoritative. pict and text fields may contain approximations.
2977 typedef struct AVSubtitleRect {
2978 int x; ///< top left corner of pict, undefined when pict is not set
2979 int y; ///< top left corner of pict, undefined when pict is not set
2980 int w; ///< width of pict, undefined when pict is not set
2981 int h; ///< height of pict, undefined when pict is not set
2982 int nb_colors; ///< number of colors in pict, undefined when pict is not set
2985 * data+linesize for the bitmap of this subtitle.
2986 * can be set for text/ass as well once they where rendered
2989 enum AVSubtitleType type;
2991 char *text; ///< 0 terminated plain UTF-8 text
2994 * 0 terminated ASS/SSA compatible event line.
2995 * The pressentation of this is unaffected by the other values in this
3001 typedef struct AVSubtitle {
3002 uint16_t format; /* 0 = graphics */
3003 uint32_t start_display_time; /* relative to packet pts, in ms */
3004 uint32_t end_display_time; /* relative to packet pts, in ms */
3006 AVSubtitleRect **rects;
3007 int64_t pts; ///< Same as packet pts, in AV_TIME_BASE
3010 /* packet functions */
3013 * @deprecated use NULL instead
3015 attribute_deprecated void av_destruct_packet_nofree(AVPacket *pkt);
3018 * Default packet destructor.
3020 void av_destruct_packet(AVPacket *pkt);
3023 * Initialize optional fields of a packet with default values.
3027 void av_init_packet(AVPacket *pkt);
3030 * Allocate the payload of a packet and initialize its fields with
3034 * @param size wanted payload size
3035 * @return 0 if OK, AVERROR_xxx otherwise
3037 int av_new_packet(AVPacket *pkt, int size);
3040 * Reduce packet size, correctly zeroing padding
3043 * @param size new size
3045 void av_shrink_packet(AVPacket *pkt, int size);
3048 * Increase packet size, correctly zeroing padding
3051 * @param grow_by number of bytes by which to increase the size of the packet
3053 int av_grow_packet(AVPacket *pkt, int grow_by);
3056 * @warning This is a hack - the packet memory allocation stuff is broken. The
3057 * packet is allocated if it was not really allocated.
3059 int av_dup_packet(AVPacket *pkt);
3064 * @param pkt packet to free
3066 void av_free_packet(AVPacket *pkt);
3069 * Allocate new information of a packet.
3072 * @param type side information type
3073 * @param size side information size
3074 * @return pointer to fresh allocated data or NULL otherwise
3076 uint8_t* av_packet_new_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
3080 * Get side information from packet.
3083 * @param type desired side information type
3084 * @param size pointer for side information size to store (optional)
3085 * @return pointer to data if present or NULL otherwise
3087 uint8_t* av_packet_get_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
3092 struct ReSampleContext;
3093 struct AVResampleContext;
3095 typedef struct ReSampleContext ReSampleContext;
3098 * Initialize audio resampling context.
3100 * @param output_channels number of output channels
3101 * @param input_channels number of input channels
3102 * @param output_rate output sample rate
3103 * @param input_rate input sample rate
3104 * @param sample_fmt_out requested output sample format
3105 * @param sample_fmt_in input sample format
3106 * @param filter_length length of each FIR filter in the filterbank relative to the cutoff frequency
3107 * @param log2_phase_count log2 of the number of entries in the polyphase filterbank
3108 * @param linear if 1 then the used FIR filter will be linearly interpolated
3109 between the 2 closest, if 0 the closest will be used
3110 * @param cutoff cutoff frequency, 1.0 corresponds to half the output sampling rate
3111 * @return allocated ReSampleContext, NULL if error occurred
3113 ReSampleContext *av_audio_resample_init(int output_channels, int input_channels,
3114 int output_rate, int input_rate,
3115 enum AVSampleFormat sample_fmt_out,
3116 enum AVSampleFormat sample_fmt_in,
3117 int filter_length, int log2_phase_count,
3118 int linear, double cutoff);
3120 int audio_resample(ReSampleContext *s, short *output, short *input, int nb_samples);
3123 * Free resample context.
3125 * @param s a non-NULL pointer to a resample context previously
3126 * created with av_audio_resample_init()
3128 void audio_resample_close(ReSampleContext *s);
3132 * Initialize an audio resampler.
3133 * Note, if either rate is not an integer then simply scale both rates up so they are.
3134 * @param filter_length length of each FIR filter in the filterbank relative to the cutoff freq
3135 * @param log2_phase_count log2 of the number of entries in the polyphase filterbank
3136 * @param linear If 1 then the used FIR filter will be linearly interpolated
3137 between the 2 closest, if 0 the closest will be used
3138 * @param cutoff cutoff frequency, 1.0 corresponds to half the output sampling rate
3140 struct AVResampleContext *av_resample_init(int out_rate, int in_rate, int filter_length, int log2_phase_count, int linear, double cutoff);
3143 * Resample an array of samples using a previously configured context.
3144 * @param src an array of unconsumed samples
3145 * @param consumed the number of samples of src which have been consumed are returned here
3146 * @param src_size the number of unconsumed samples available
3147 * @param dst_size the amount of space in samples available in dst
3148 * @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.
3149 * @return the number of samples written in dst or -1 if an error occurred
3151 int av_resample(struct AVResampleContext *c, short *dst, short *src, int *consumed, int src_size, int dst_size, int update_ctx);
3155 * Compensate samplerate/timestamp drift. The compensation is done by changing
3156 * the resampler parameters, so no audible clicks or similar distortions occur
3157 * @param compensation_distance distance in output samples over which the compensation should be performed
3158 * @param sample_delta number of output samples which should be output less
3160 * example: av_resample_compensate(c, 10, 500)
3161 * here instead of 510 samples only 500 samples would be output
3163 * note, due to rounding the actual compensation might be slightly different,
3164 * especially if the compensation_distance is large and the in_rate used during init is small
3166 void av_resample_compensate(struct AVResampleContext *c, int sample_delta, int compensation_distance);
3167 void av_resample_close(struct AVResampleContext *c);
3170 * Allocate memory for a picture. Call avpicture_free() to free it.
3172 * @see avpicture_fill()
3174 * @param picture the picture to be filled in
3175 * @param pix_fmt the format of the picture
3176 * @param width the width of the picture
3177 * @param height the height of the picture
3178 * @return zero if successful, a negative value if not
3180 int avpicture_alloc(AVPicture *picture, enum PixelFormat pix_fmt, int width, int height);
3183 * Free a picture previously allocated by avpicture_alloc().
3184 * The data buffer used by the AVPicture is freed, but the AVPicture structure
3187 * @param picture the AVPicture to be freed
3189 void avpicture_free(AVPicture *picture);
3192 * Fill in the AVPicture fields.
3193 * The fields of the given AVPicture are filled in by using the 'ptr' address
3194 * which points to the image data buffer. Depending on the specified picture
3195 * format, one or multiple image data pointers and line sizes will be set.
3196 * If a planar format is specified, several pointers will be set pointing to
3197 * the different picture planes and the line sizes of the different planes
3198 * will be stored in the lines_sizes array.
3199 * Call with ptr == NULL to get the required size for the ptr buffer.
3201 * To allocate the buffer and fill in the AVPicture fields in one call,
3202 * use avpicture_alloc().
3204 * @param picture AVPicture whose fields are to be filled in
3205 * @param ptr Buffer which will contain or contains the actual image data
3206 * @param pix_fmt The format in which the picture data is stored.
3207 * @param width the width of the image in pixels
3208 * @param height the height of the image in pixels
3209 * @return size of the image data in bytes
3211 int avpicture_fill(AVPicture *picture, uint8_t *ptr,
3212 enum PixelFormat pix_fmt, int width, int height);
3215 * Copy pixel data from an AVPicture into a buffer.
3216 * The data is stored compactly, without any gaps for alignment or padding
3217 * which may be applied by avpicture_fill().
3219 * @see avpicture_get_size()
3221 * @param[in] src AVPicture containing image data
3222 * @param[in] pix_fmt The format in which the picture data is stored.
3223 * @param[in] width the width of the image in pixels.
3224 * @param[in] height the height of the image in pixels.
3225 * @param[out] dest A buffer into which picture data will be copied.
3226 * @param[in] dest_size The size of 'dest'.
3227 * @return The number of bytes written to dest, or a negative value (error code) on error.
3229 int avpicture_layout(const AVPicture* src, enum PixelFormat pix_fmt, int width, int height,
3230 unsigned char *dest, int dest_size);
3233 * Calculate the size in bytes that a picture of the given width and height
3234 * would occupy if stored in the given picture format.
3235 * Note that this returns the size of a compact representation as generated
3236 * by avpicture_layout(), which can be smaller than the size required for e.g.
3239 * @param pix_fmt the given picture format
3240 * @param width the width of the image
3241 * @param height the height of the image
3242 * @return Image data size in bytes or -1 on error (e.g. too large dimensions).
3244 int avpicture_get_size(enum PixelFormat pix_fmt, int width, int height);
3245 void avcodec_get_chroma_sub_sample(enum PixelFormat pix_fmt, int *h_shift, int *v_shift);
3247 void avcodec_set_dimensions(AVCodecContext *s, int width, int height);
3250 * Return a value representing the fourCC code associated to the
3251 * pixel format pix_fmt, or 0 if no associated fourCC code can be
3254 unsigned int avcodec_pix_fmt_to_codec_tag(enum PixelFormat pix_fmt);
3257 * Put a string representing the codec tag codec_tag in buf.
3259 * @param buf_size size in bytes of buf
3260 * @return the length of the string that would have been generated if
3261 * enough space had been available, excluding the trailing null
3263 size_t av_get_codec_tag_string(char *buf, size_t buf_size, unsigned int codec_tag);
3265 #define FF_LOSS_RESOLUTION 0x0001 /**< loss due to resolution change */
3266 #define FF_LOSS_DEPTH 0x0002 /**< loss due to color depth change */
3267 #define FF_LOSS_COLORSPACE 0x0004 /**< loss due to color space conversion */
3268 #define FF_LOSS_ALPHA 0x0008 /**< loss of alpha bits */
3269 #define FF_LOSS_COLORQUANT 0x0010 /**< loss due to color quantization */
3270 #define FF_LOSS_CHROMA 0x0020 /**< loss of chroma (e.g. RGB to gray conversion) */
3273 * Compute what kind of losses will occur when converting from one specific
3274 * pixel format to another.
3275 * When converting from one pixel format to another, information loss may occur.
3276 * For example, when converting from RGB24 to GRAY, the color information will
3277 * be lost. Similarly, other losses occur when converting from some formats to
3278 * other formats. These losses can involve loss of chroma, but also loss of
3279 * resolution, loss of color depth, loss due to the color space conversion, loss
3280 * of the alpha bits or loss due to color quantization.
3281 * avcodec_get_fix_fmt_loss() informs you about the various types of losses
3282 * which will occur when converting from one pixel format to another.
3284 * @param[in] dst_pix_fmt destination pixel format
3285 * @param[in] src_pix_fmt source pixel format
3286 * @param[in] has_alpha Whether the source pixel format alpha channel is used.
3287 * @return Combination of flags informing you what kind of losses will occur.
3289 int avcodec_get_pix_fmt_loss(enum PixelFormat dst_pix_fmt, enum PixelFormat src_pix_fmt,
3293 * Find the best pixel format to convert to given a certain source pixel
3294 * format. When converting from one pixel format to another, information loss
3295 * may occur. For example, when converting from RGB24 to GRAY, the color
3296 * information will be lost. Similarly, other losses occur when converting from
3297 * some formats to other formats. avcodec_find_best_pix_fmt() searches which of
3298 * the given pixel formats should be used to suffer the least amount of loss.
3299 * The pixel formats from which it chooses one, are determined by the
3300 * pix_fmt_mask parameter.
3303 * src_pix_fmt = PIX_FMT_YUV420P;
3304 * pix_fmt_mask = (1 << PIX_FMT_YUV422P) || (1 << PIX_FMT_RGB24);
3305 * dst_pix_fmt = avcodec_find_best_pix_fmt(pix_fmt_mask, src_pix_fmt, alpha, &loss);
3308 * @param[in] pix_fmt_mask bitmask determining which pixel format to choose from
3309 * @param[in] src_pix_fmt source pixel format
3310 * @param[in] has_alpha Whether the source pixel format alpha channel is used.
3311 * @param[out] loss_ptr Combination of flags informing you what kind of losses will occur.
3312 * @return The best pixel format to convert to or -1 if none was found.
3314 enum PixelFormat avcodec_find_best_pix_fmt(int64_t pix_fmt_mask, enum PixelFormat src_pix_fmt,
3315 int has_alpha, int *loss_ptr);
3317 /* deinterlace a picture */
3318 /* deinterlace - if not supported return -1 */
3319 int avpicture_deinterlace(AVPicture *dst, const AVPicture *src,
3320 enum PixelFormat pix_fmt, int width, int height);
3322 /* external high level API */
3325 * If c is NULL, returns the first registered codec,
3326 * if c is non-NULL, returns the next registered codec after c,
3327 * or NULL if c is the last one.
3329 AVCodec *av_codec_next(AVCodec *c);
3332 * Return the LIBAVCODEC_VERSION_INT constant.
3334 unsigned avcodec_version(void);
3337 * Return the libavcodec build-time configuration.
3339 const char *avcodec_configuration(void);
3342 * Return the libavcodec license.
3344 const char *avcodec_license(void);
3347 * Register the codec codec and initialize libavcodec.
3349 * @warning either this function or avcodec_register_all() must be called
3350 * before any other libavcodec functions.
3352 * @see avcodec_register_all()
3354 void avcodec_register(AVCodec *codec);
3357 * Find a registered encoder with a matching codec ID.
3359 * @param id CodecID of the requested encoder
3360 * @return An encoder if one was found, NULL otherwise.
3362 AVCodec *avcodec_find_encoder(enum CodecID id);
3365 * Find a registered encoder with the specified name.
3367 * @param name name of the requested encoder
3368 * @return An encoder if one was found, NULL otherwise.
3370 AVCodec *avcodec_find_encoder_by_name(const char *name);
3373 * Find a registered decoder with a matching codec ID.
3375 * @param id CodecID of the requested decoder
3376 * @return A decoder if one was found, NULL otherwise.
3378 AVCodec *avcodec_find_decoder(enum CodecID id);
3381 * Find a registered decoder with the specified name.
3383 * @param name name of the requested decoder
3384 * @return A decoder if one was found, NULL otherwise.
3386 AVCodec *avcodec_find_decoder_by_name(const char *name);
3387 void avcodec_string(char *buf, int buf_size, AVCodecContext *enc, int encode);
3390 * Return a name for the specified profile, if available.
3392 * @param codec the codec that is searched for the given profile
3393 * @param profile the profile value for which a name is requested
3394 * @return A name for the profile if found, NULL otherwise.
3396 const char *av_get_profile_name(const AVCodec *codec, int profile);
3399 * Set the fields of the given AVCodecContext to default values corresponding
3400 * to the given codec (defaults may be codec-dependent).
3402 * Do not call this function if a non-NULL codec has been passed
3403 * to avcodec_alloc_context3() that allocated this AVCodecContext.
3404 * If codec is non-NULL, it is illegal to call avcodec_open2() with a
3405 * different codec on this AVCodecContext.
3407 int avcodec_get_context_defaults3(AVCodecContext *s, AVCodec *codec);
3410 * Allocate an AVCodecContext and set its fields to default values. The
3411 * resulting struct can be deallocated by calling avcodec_close() on it followed
3414 * @param codec if non-NULL, allocate private data and initialize defaults
3415 * for the given codec. It is illegal to then call avcodec_open2()
3416 * with a different codec.
3417 * If NULL, then the codec-specific defaults won't be initialized,
3418 * which may result in suboptimal default settings (this is
3419 * important mainly for encoders, e.g. libx264).
3421 * @return An AVCodecContext filled with default values or NULL on failure.
3422 * @see avcodec_get_context_defaults
3424 AVCodecContext *avcodec_alloc_context3(AVCodec *codec);
3427 * Copy the settings of the source AVCodecContext into the destination
3428 * AVCodecContext. The resulting destination codec context will be
3429 * unopened, i.e. you are required to call avcodec_open2() before you
3430 * can use this AVCodecContext to decode/encode video/audio data.
3432 * @param dest target codec context, should be initialized with
3433 * avcodec_alloc_context3(), but otherwise uninitialized
3434 * @param src source codec context
3435 * @return AVERROR() on error (e.g. memory allocation error), 0 on success
3437 int avcodec_copy_context(AVCodecContext *dest, const AVCodecContext *src);
3440 * Set the fields of the given AVFrame to default values.
3442 * @param pic The AVFrame of which the fields should be set to default values.
3444 void avcodec_get_frame_defaults(AVFrame *pic);
3447 * Allocate an AVFrame and set its fields to default values. The resulting
3448 * struct can be deallocated by simply calling av_free().
3450 * @return An AVFrame filled with default values or NULL on failure.
3451 * @see avcodec_get_frame_defaults
3453 AVFrame *avcodec_alloc_frame(void);
3455 int avcodec_default_get_buffer(AVCodecContext *s, AVFrame *pic);
3456 void avcodec_default_release_buffer(AVCodecContext *s, AVFrame *pic);
3457 int avcodec_default_reget_buffer(AVCodecContext *s, AVFrame *pic);
3460 * Return the amount of padding in pixels which the get_buffer callback must
3461 * provide around the edge of the image for codecs which do not have the
3462 * CODEC_FLAG_EMU_EDGE flag.
3464 * @return Required padding in pixels.
3466 unsigned avcodec_get_edge_width(void);
3468 * Modify width and height values so that they will result in a memory
3469 * buffer that is acceptable for the codec if you do not use any horizontal
3472 * May only be used if a codec with CODEC_CAP_DR1 has been opened.
3473 * If CODEC_FLAG_EMU_EDGE is not set, the dimensions must have been increased
3474 * according to avcodec_get_edge_width() before.
3476 void avcodec_align_dimensions(AVCodecContext *s, int *width, int *height);
3478 * Modify width and height values so that they will result in a memory
3479 * buffer that is acceptable for the codec if you also ensure that all
3480 * line sizes are a multiple of the respective linesize_align[i].
3482 * May only be used if a codec with CODEC_CAP_DR1 has been opened.
3483 * If CODEC_FLAG_EMU_EDGE is not set, the dimensions must have been increased
3484 * according to avcodec_get_edge_width() before.
3486 void avcodec_align_dimensions2(AVCodecContext *s, int *width, int *height,
3487 int linesize_align[AV_NUM_DATA_POINTERS]);
3489 enum PixelFormat avcodec_default_get_format(struct AVCodecContext *s, const enum PixelFormat * fmt);
3491 int avcodec_default_execute(AVCodecContext *c, int (*func)(AVCodecContext *c2, void *arg2),void *arg, int *ret, int count, int size);
3492 int avcodec_default_execute2(AVCodecContext *c, int (*func)(AVCodecContext *c2, void *arg2, int, int),void *arg, int *ret, int count);
3493 //FIXME func typedef
3496 * Initialize the AVCodecContext to use the given AVCodec. Prior to using this
3497 * function the context has to be allocated with avcodec_alloc_context3().
3499 * The functions avcodec_find_decoder_by_name(), avcodec_find_encoder_by_name(),
3500 * avcodec_find_decoder() and avcodec_find_encoder() provide an easy way for
3501 * retrieving a codec.
3503 * @warning This function is not thread safe!
3506 * avcodec_register_all();
3507 * av_dict_set(&opts, "b", "2.5M", 0);
3508 * codec = avcodec_find_decoder(CODEC_ID_H264);
3512 * context = avcodec_alloc_context3(codec);
3514 * if (avcodec_open2(context, codec, opts) < 0)
3518 * @param avctx The context to initialize.
3519 * @param codec The codec to open this context for. If a non-NULL codec has been
3520 * previously passed to avcodec_alloc_context3() or
3521 * avcodec_get_context_defaults3() for this context, then this
3522 * parameter MUST be either NULL or equal to the previously passed
3524 * @param options A dictionary filled with AVCodecContext and codec-private options.
3525 * On return this object will be filled with options that were not found.
3527 * @return zero on success, a negative value on error
3528 * @see avcodec_alloc_context3(), avcodec_find_decoder(), avcodec_find_encoder(),
3529 * av_dict_set(), av_opt_find().
3531 int avcodec_open2(AVCodecContext *avctx, AVCodec *codec, AVDictionary **options);
3533 #if FF_API_OLD_DECODE_AUDIO
3535 * Wrapper function which calls avcodec_decode_audio4.
3537 * @deprecated Use avcodec_decode_audio4 instead.
3539 * Decode the audio frame of size avpkt->size from avpkt->data into samples.
3540 * Some decoders may support multiple frames in a single AVPacket, such
3541 * decoders would then just decode the first frame. In this case,
3542 * avcodec_decode_audio3 has to be called again with an AVPacket that contains
3543 * the remaining data in order to decode the second frame etc.
3545 * could be outputted, frame_size_ptr is zero. Otherwise, it is the
3546 * decompressed frame size in bytes.
3548 * @warning You must set frame_size_ptr to the allocated size of the
3549 * output buffer before calling avcodec_decode_audio3().
3551 * @warning The input buffer must be FF_INPUT_BUFFER_PADDING_SIZE larger than
3552 * the actual read bytes because some optimized bitstream readers read 32 or 64
3553 * bits at once and could read over the end.
3555 * @warning The end of the input buffer avpkt->data should be set to 0 to ensure that
3556 * no overreading happens for damaged MPEG streams.
3558 * @warning You must not provide a custom get_buffer() when using
3559 * avcodec_decode_audio3(). Doing so will override it with
3560 * avcodec_default_get_buffer. Use avcodec_decode_audio4() instead,
3561 * which does allow the application to provide a custom get_buffer().
3563 * @note You might have to align the input buffer avpkt->data and output buffer
3564 * samples. The alignment requirements depend on the CPU: On some CPUs it isn't
3565 * necessary at all, on others it won't work at all if not aligned and on others
3566 * it will work but it will have an impact on performance.
3568 * In practice, avpkt->data should have 4 byte alignment at minimum and
3569 * samples should be 16 byte aligned unless the CPU doesn't need it
3570 * (AltiVec and SSE do).
3572 * @note Codecs which have the CODEC_CAP_DELAY capability set have a delay
3573 * between input and output, these need to be fed with avpkt->data=NULL,
3574 * avpkt->size=0 at the end to return the remaining frames.
3576 * @param avctx the codec context
3577 * @param[out] samples the output buffer, sample type in avctx->sample_fmt
3578 * If the sample format is planar, each channel plane will
3579 * be the same size, with no padding between channels.
3580 * @param[in,out] frame_size_ptr the output buffer size in bytes
3581 * @param[in] avpkt The input AVPacket containing the input buffer.
3582 * You can create such packet with av_init_packet() and by then setting
3583 * data and size, some decoders might in addition need other fields.
3584 * All decoders are designed to use the least fields possible though.
3585 * @return On error a negative value is returned, otherwise the number of bytes
3586 * used or zero if no frame data was decompressed (used) from the input AVPacket.
3588 attribute_deprecated int avcodec_decode_audio3(AVCodecContext *avctx, int16_t *samples,
3589 int *frame_size_ptr,
3594 * Decode the audio frame of size avpkt->size from avpkt->data into frame.
3596 * Some decoders may support multiple frames in a single AVPacket. Such
3597 * decoders would then just decode the first frame. In this case,
3598 * avcodec_decode_audio4 has to be called again with an AVPacket containing
3599 * the remaining data in order to decode the second frame, etc...
3600 * Even if no frames are returned, the packet needs to be fed to the decoder
3601 * with remaining data until it is completely consumed or an error occurs.
3603 * @warning The input buffer, avpkt->data must be FF_INPUT_BUFFER_PADDING_SIZE
3604 * larger than the actual read bytes because some optimized bitstream
3605 * readers read 32 or 64 bits at once and could read over the end.
3607 * @note You might have to align the input buffer. The alignment requirements
3608 * depend on the CPU and the decoder.
3610 * @param avctx the codec context
3611 * @param[out] frame The AVFrame in which to store decoded audio samples.
3612 * Decoders request a buffer of a particular size by setting
3613 * AVFrame.nb_samples prior to calling get_buffer(). The
3614 * decoder may, however, only utilize part of the buffer by
3615 * setting AVFrame.nb_samples to a smaller value in the
3617 * @param[out] got_frame_ptr Zero if no frame could be decoded, otherwise it is
3619 * @param[in] avpkt The input AVPacket containing the input buffer.
3620 * At least avpkt->data and avpkt->size should be set. Some
3621 * decoders might also require additional fields to be set.
3622 * @return A negative error code is returned if an error occurred during
3623 * decoding, otherwise the number of bytes consumed from the input
3624 * AVPacket is returned.
3626 int avcodec_decode_audio4(AVCodecContext *avctx, AVFrame *frame,
3627 int *got_frame_ptr, AVPacket *avpkt);
3630 * Decode the video frame of size avpkt->size from avpkt->data into picture.
3631 * Some decoders may support multiple frames in a single AVPacket, such
3632 * decoders would then just decode the first frame.
3634 * @warning The input buffer must be FF_INPUT_BUFFER_PADDING_SIZE larger than
3635 * the actual read bytes because some optimized bitstream readers read 32 or 64
3636 * bits at once and could read over the end.
3638 * @warning The end of the input buffer buf should be set to 0 to ensure that
3639 * no overreading happens for damaged MPEG streams.
3641 * @note You might have to align the input buffer avpkt->data.
3642 * The alignment requirements depend on the CPU: on some CPUs it isn't
3643 * necessary at all, on others it won't work at all if not aligned and on others
3644 * it will work but it will have an impact on performance.
3646 * In practice, avpkt->data should have 4 byte alignment at minimum.
3648 * @note Codecs which have the CODEC_CAP_DELAY capability set have a delay
3649 * between input and output, these need to be fed with avpkt->data=NULL,
3650 * avpkt->size=0 at the end to return the remaining frames.
3652 * @param avctx the codec context
3653 * @param[out] picture The AVFrame in which the decoded video frame will be stored.
3654 * Use avcodec_alloc_frame to get an AVFrame, the codec will
3655 * allocate memory for the actual bitmap.
3656 * with default get/release_buffer(), the decoder frees/reuses the bitmap as it sees fit.
3657 * with overridden get/release_buffer() (needs CODEC_CAP_DR1) the user decides into what buffer the decoder
3658 * decodes and the decoder tells the user once it does not need the data anymore,
3659 * the user app can at this point free/reuse/keep the memory as it sees fit.
3661 * @param[in] avpkt The input AVpacket containing the input buffer.
3662 * You can create such packet with av_init_packet() and by then setting
3663 * data and size, some decoders might in addition need other fields like
3664 * flags&AV_PKT_FLAG_KEY. All decoders are designed to use the least
3666 * @param[in,out] got_picture_ptr Zero if no frame could be decompressed, otherwise, it is nonzero.
3667 * @return On error a negative value is returned, otherwise the number of bytes
3668 * used or zero if no frame could be decompressed.
3670 int avcodec_decode_video2(AVCodecContext *avctx, AVFrame *picture,
3671 int *got_picture_ptr,
3675 * Decode a subtitle message.
3676 * Return a negative value on error, otherwise return the number of bytes used.
3677 * If no subtitle could be decompressed, got_sub_ptr is zero.
3678 * Otherwise, the subtitle is stored in *sub.
3679 * Note that CODEC_CAP_DR1 is not available for subtitle codecs. This is for
3680 * simplicity, because the performance difference is expect to be negligible
3681 * and reusing a get_buffer written for video codecs would probably perform badly
3682 * due to a potentially very different allocation pattern.
3684 * @param avctx the codec context
3685 * @param[out] sub The AVSubtitle in which the decoded subtitle will be stored, must be
3686 freed with avsubtitle_free if *got_sub_ptr is set.
3687 * @param[in,out] got_sub_ptr Zero if no subtitle could be decompressed, otherwise, it is nonzero.
3688 * @param[in] avpkt The input AVPacket containing the input buffer.
3690 int avcodec_decode_subtitle2(AVCodecContext *avctx, AVSubtitle *sub,
3695 * Free all allocated data in the given subtitle struct.
3697 * @param sub AVSubtitle to free.
3699 void avsubtitle_free(AVSubtitle *sub);
3701 #if FF_API_OLD_ENCODE_AUDIO
3703 * Encode an audio frame from samples into buf.
3705 * @deprecated Use avcodec_encode_audio2 instead.
3707 * @note The output buffer should be at least FF_MIN_BUFFER_SIZE bytes large.
3708 * However, for codecs with avctx->frame_size equal to 0 (e.g. PCM) the user
3709 * will know how much space is needed because it depends on the value passed
3710 * in buf_size as described below. In that case a lower value can be used.
3712 * @param avctx the codec context
3713 * @param[out] buf the output buffer
3714 * @param[in] buf_size the output buffer size
3715 * @param[in] samples the input buffer containing the samples
3716 * The number of samples read from this buffer is frame_size*channels,
3717 * both of which are defined in avctx.
3718 * For codecs which have avctx->frame_size equal to 0 (e.g. PCM) the number of
3719 * samples read from samples is equal to:
3720 * buf_size * 8 / (avctx->channels * av_get_bits_per_sample(avctx->codec_id))
3721 * This also implies that av_get_bits_per_sample() must not return 0 for these
3723 * @return On error a negative value is returned, on success zero or the number
3724 * of bytes used to encode the data read from the input buffer.
3726 int attribute_deprecated avcodec_encode_audio(AVCodecContext *avctx,
3727 uint8_t *buf, int buf_size,
3728 const short *samples);
3732 * Encode a frame of audio.
3734 * Takes input samples from frame and writes the next output packet, if
3735 * available, to avpkt. The output packet does not necessarily contain data for
3736 * the most recent frame, as encoders can delay, split, and combine input frames
3737 * internally as needed.
3739 * @param avctx codec context
3740 * @param avpkt output AVPacket.
3741 * The user can supply an output buffer by setting
3742 * avpkt->data and avpkt->size prior to calling the
3743 * function, but if the size of the user-provided data is not
3744 * large enough, encoding will fail. All other AVPacket fields
3745 * will be reset by the encoder using av_init_packet(). If
3746 * avpkt->data is NULL, the encoder will allocate it.
3747 * The encoder will set avpkt->size to the size of the
3749 * @param[in] frame AVFrame containing the raw audio data to be encoded.
3750 * May be NULL when flushing an encoder that has the
3751 * CODEC_CAP_DELAY capability set.
3752 * There are 2 codec capabilities that affect the allowed
3753 * values of frame->nb_samples.
3754 * If CODEC_CAP_SMALL_LAST_FRAME is set, then only the final
3755 * frame may be smaller than avctx->frame_size, and all other
3756 * frames must be equal to avctx->frame_size.
3757 * If CODEC_CAP_VARIABLE_FRAME_SIZE is set, then each frame
3758 * can have any number of samples.
3759 * If neither is set, frame->nb_samples must be equal to
3760 * avctx->frame_size for all frames.
3761 * @param[out] got_packet_ptr This field is set to 1 by libavcodec if the
3762 * output packet is non-empty, and to 0 if it is
3763 * empty. If the function returns an error, the
3764 * packet can be assumed to be invalid, and the
3765 * value of got_packet_ptr is undefined and should
3767 * @return 0 on success, negative error code on failure
3769 int avcodec_encode_audio2(AVCodecContext *avctx, AVPacket *avpkt,
3770 const AVFrame *frame, int *got_packet_ptr);
3773 * Fill audio frame data and linesize.
3774 * AVFrame extended_data channel pointers are allocated if necessary for
3777 * @param frame the AVFrame
3778 * frame->nb_samples must be set prior to calling the
3779 * function. This function fills in frame->data,
3780 * frame->extended_data, frame->linesize[0].
3781 * @param nb_channels channel count
3782 * @param sample_fmt sample format
3783 * @param buf buffer to use for frame data
3784 * @param buf_size size of buffer
3785 * @param align plane size sample alignment
3786 * @return 0 on success, negative error code on failure
3788 int avcodec_fill_audio_frame(AVFrame *frame, int nb_channels,
3789 enum AVSampleFormat sample_fmt, const uint8_t *buf,
3790 int buf_size, int align);
3792 #if FF_API_OLD_ENCODE_VIDEO
3794 * @deprecated use avcodec_encode_video2() instead.
3796 * Encode a video frame from pict into buf.
3797 * The input picture should be
3798 * stored using a specific format, namely avctx.pix_fmt.
3800 * @param avctx the codec context
3801 * @param[out] buf the output buffer for the bitstream of encoded frame
3802 * @param[in] buf_size the size of the output buffer in bytes
3803 * @param[in] pict the input picture to encode
3804 * @return On error a negative value is returned, on success zero or the number
3805 * of bytes used from the output buffer.
3807 attribute_deprecated
3808 int avcodec_encode_video(AVCodecContext *avctx, uint8_t *buf, int buf_size,
3809 const AVFrame *pict);
3813 * Encode a frame of video.
3815 * Takes input raw video data from frame and writes the next output packet, if
3816 * available, to avpkt. The output packet does not necessarily contain data for
3817 * the most recent frame, as encoders can delay and reorder input frames
3818 * internally as needed.
3820 * @param avctx codec context
3821 * @param avpkt output AVPacket.
3822 * The user can supply an output buffer by setting
3823 * avpkt->data and avpkt->size prior to calling the
3824 * function, but if the size of the user-provided data is not
3825 * large enough, encoding will fail. All other AVPacket fields
3826 * will be reset by the encoder using av_init_packet(). If
3827 * avpkt->data is NULL, the encoder will allocate it.
3828 * The encoder will set avpkt->size to the size of the
3829 * output packet. The returned data (if any) belongs to the
3830 * caller, he is responsible for freeing it.
3831 * @param[in] frame AVFrame containing the raw video data to be encoded.
3832 * May be NULL when flushing an encoder that has the
3833 * CODEC_CAP_DELAY capability set.
3834 * @param[out] got_packet_ptr This field is set to 1 by libavcodec if the
3835 * output packet is non-empty, and to 0 if it is
3836 * empty. If the function returns an error, the
3837 * packet can be assumed to be invalid, and the
3838 * value of got_packet_ptr is undefined and should
3840 * @return 0 on success, negative error code on failure
3842 int avcodec_encode_video2(AVCodecContext *avctx, AVPacket *avpkt,
3843 const AVFrame *frame, int *got_packet_ptr);
3845 int avcodec_encode_subtitle(AVCodecContext *avctx, uint8_t *buf, int buf_size,
3846 const AVSubtitle *sub);
3849 * Close a given AVCodecContext and free all the data associated with it
3850 * (but not the AVCodecContext itself).
3852 * Calling this function on an AVCodecContext that hasn't been opened will free
3853 * the codec-specific data allocated in avcodec_alloc_context3() /
3854 * avcodec_get_context_defaults3() with a non-NULL codec. Subsequent calls will
3857 int avcodec_close(AVCodecContext *avctx);
3860 * Register all the codecs, parsers and bitstream filters which were enabled at
3861 * configuration time. If you do not call this function you can select exactly
3862 * which formats you want to support, by using the individual registration
3865 * @see avcodec_register
3866 * @see av_register_codec_parser
3867 * @see av_register_bitstream_filter
3869 void avcodec_register_all(void);
3872 * Flush buffers, should be called when seeking or when switching to a different stream.
3874 void avcodec_flush_buffers(AVCodecContext *avctx);
3876 void avcodec_default_free_buffers(AVCodecContext *s);
3878 /* misc useful functions */
3881 * Return codec bits per sample.
3883 * @param[in] codec_id the codec
3884 * @return Number of bits per sample or zero if unknown for the given codec.
3886 int av_get_bits_per_sample(enum CodecID codec_id);
3889 typedef struct AVCodecParserContext {
3891 struct AVCodecParser *parser;
3892 int64_t frame_offset; /* offset of the current frame */
3893 int64_t cur_offset; /* current offset
3894 (incremented by each av_parser_parse()) */
3895 int64_t next_frame_offset; /* offset of the next frame */
3897 int pict_type; /* XXX: Put it back in AVCodecContext. */
3899 * This field is used for proper frame duration computation in lavf.
3900 * It signals, how much longer the frame duration of the current frame
3901 * is compared to normal frame duration.
3903 * frame_duration = (1 + repeat_pict) * time_base
3905 * It is used by codecs like H.264 to display telecined material.
3907 int repeat_pict; /* XXX: Put it back in AVCodecContext. */
3908 int64_t pts; /* pts of the current frame */
3909 int64_t dts; /* dts of the current frame */
3914 int fetch_timestamp;
3916 #define AV_PARSER_PTS_NB 4
3917 int cur_frame_start_index;
3918 int64_t cur_frame_offset[AV_PARSER_PTS_NB];
3919 int64_t cur_frame_pts[AV_PARSER_PTS_NB];
3920 int64_t cur_frame_dts[AV_PARSER_PTS_NB];
3923 #define PARSER_FLAG_COMPLETE_FRAMES 0x0001
3924 #define PARSER_FLAG_ONCE 0x0002
3925 /// Set if the parser has a valid file offset
3926 #define PARSER_FLAG_FETCHED_OFFSET 0x0004
3928 int64_t offset; ///< byte offset from starting packet start
3929 int64_t cur_frame_end[AV_PARSER_PTS_NB];
3932 * Set by parser to 1 for key frames and 0 for non-key frames.
3933 * It is initialized to -1, so if the parser doesn't set this flag,
3934 * old-style fallback using AV_PICTURE_TYPE_I picture type as key frames
3940 * Time difference in stream time base units from the pts of this
3941 * packet to the point at which the output from the decoder has converged
3942 * independent from the availability of previous frames. That is, the
3943 * frames are virtually identical no matter if decoding started from
3944 * the very first frame or from this keyframe.
3945 * Is AV_NOPTS_VALUE if unknown.
3946 * This field is not the display duration of the current frame.
3947 * This field has no meaning if the packet does not have AV_PKT_FLAG_KEY
3950 * The purpose of this field is to allow seeking in streams that have no
3951 * keyframes in the conventional sense. It corresponds to the
3952 * recovery point SEI in H.264 and match_time_delta in NUT. It is also
3953 * essential for some types of subtitle streams to ensure that all
3954 * subtitles are correctly displayed after seeking.
3956 int64_t convergence_duration;
3958 // Timestamp generation support:
3960 * Synchronization point for start of timestamp generation.
3962 * Set to >0 for sync point, 0 for no sync point and <0 for undefined
3965 * For example, this corresponds to presence of H.264 buffering period
3971 * Offset of the current timestamp against last timestamp sync point in
3972 * units of AVCodecContext.time_base.
3974 * Set to INT_MIN when dts_sync_point unused. Otherwise, it must
3975 * contain a valid timestamp offset.
3977 * Note that the timestamp of sync point has usually a nonzero
3978 * dts_ref_dts_delta, which refers to the previous sync point. Offset of
3979 * the next frame after timestamp sync point will be usually 1.
3981 * For example, this corresponds to H.264 cpb_removal_delay.
3983 int dts_ref_dts_delta;
3986 * Presentation delay of current frame in units of AVCodecContext.time_base.
3988 * Set to INT_MIN when dts_sync_point unused. Otherwise, it must
3989 * contain valid non-negative timestamp delta (presentation time of a frame
3990 * must not lie in the past).
3992 * This delay represents the difference between decoding and presentation
3993 * time of the frame.
3995 * For example, this corresponds to H.264 dpb_output_delay.
4000 * Position of the packet in file.
4002 * Analogous to cur_frame_pts/dts
4004 int64_t cur_frame_pos[AV_PARSER_PTS_NB];
4007 * Byte position of currently parsed frame in stream.
4012 * Previous frame byte position.
4017 * Duration of the current frame.
4018 * For audio, this is in units of 1 / AVCodecContext.sample_rate.
4019 * For all other types, this is in units of AVCodecContext.time_base.
4022 } AVCodecParserContext;
4024 typedef struct AVCodecParser {
4025 int codec_ids[5]; /* several codec IDs are permitted */
4027 int (*parser_init)(AVCodecParserContext *s);
4028 int (*parser_parse)(AVCodecParserContext *s,
4029 AVCodecContext *avctx,
4030 const uint8_t **poutbuf, int *poutbuf_size,
4031 const uint8_t *buf, int buf_size);
4032 void (*parser_close)(AVCodecParserContext *s);
4033 int (*split)(AVCodecContext *avctx, const uint8_t *buf, int buf_size);
4034 struct AVCodecParser *next;
4037 AVCodecParser *av_parser_next(AVCodecParser *c);
4039 void av_register_codec_parser(AVCodecParser *parser);
4040 AVCodecParserContext *av_parser_init(int codec_id);
4045 * @param s parser context.
4046 * @param avctx codec context.
4047 * @param poutbuf set to pointer to parsed buffer or NULL if not yet finished.
4048 * @param poutbuf_size set to size of parsed buffer or zero if not yet finished.
4049 * @param buf input buffer.
4050 * @param buf_size input length, to signal EOF, this should be 0 (so that the last frame can be output).
4051 * @param pts input presentation timestamp.
4052 * @param dts input decoding timestamp.
4053 * @param pos input byte position in stream.
4054 * @return the number of bytes of the input bitstream used.
4059 * len = av_parser_parse2(myparser, AVCodecContext, &data, &size,
4066 * decode_frame(data, size);
4070 int av_parser_parse2(AVCodecParserContext *s,
4071 AVCodecContext *avctx,
4072 uint8_t **poutbuf, int *poutbuf_size,
4073 const uint8_t *buf, int buf_size,
4074 int64_t pts, int64_t dts,
4077 int av_parser_change(AVCodecParserContext *s,
4078 AVCodecContext *avctx,
4079 uint8_t **poutbuf, int *poutbuf_size,
4080 const uint8_t *buf, int buf_size, int keyframe);
4081 void av_parser_close(AVCodecParserContext *s);
4084 typedef struct AVBitStreamFilterContext {
4086 struct AVBitStreamFilter *filter;
4087 AVCodecParserContext *parser;
4088 struct AVBitStreamFilterContext *next;
4089 } AVBitStreamFilterContext;
4092 typedef struct AVBitStreamFilter {
4095 int (*filter)(AVBitStreamFilterContext *bsfc,
4096 AVCodecContext *avctx, const char *args,
4097 uint8_t **poutbuf, int *poutbuf_size,
4098 const uint8_t *buf, int buf_size, int keyframe);
4099 void (*close)(AVBitStreamFilterContext *bsfc);
4100 struct AVBitStreamFilter *next;
4101 } AVBitStreamFilter;
4103 void av_register_bitstream_filter(AVBitStreamFilter *bsf);
4104 AVBitStreamFilterContext *av_bitstream_filter_init(const char *name);
4105 int av_bitstream_filter_filter(AVBitStreamFilterContext *bsfc,
4106 AVCodecContext *avctx, const char *args,
4107 uint8_t **poutbuf, int *poutbuf_size,
4108 const uint8_t *buf, int buf_size, int keyframe);
4109 void av_bitstream_filter_close(AVBitStreamFilterContext *bsf);
4111 AVBitStreamFilter *av_bitstream_filter_next(AVBitStreamFilter *f);
4116 * Reallocate the given block if it is not large enough, otherwise do nothing.
4120 void *av_fast_realloc(void *ptr, unsigned int *size, size_t min_size);
4123 * Allocate a buffer, reusing the given one if large enough.
4125 * Contrary to av_fast_realloc the current buffer contents might not be
4126 * preserved and on error the old buffer is freed, thus no special
4127 * handling to avoid memleaks is necessary.
4129 * @param ptr pointer to pointer to already allocated buffer, overwritten with pointer to new buffer
4130 * @param size size of the buffer *ptr points to
4131 * @param min_size minimum size of *ptr buffer after returning, *ptr will be NULL and
4132 * *size 0 if an error occurred.
4134 void av_fast_malloc(void *ptr, unsigned int *size, size_t min_size);
4137 * Allocate a buffer with padding, reusing the given one if large enough.
4139 * Same behaviour av_fast_malloc but the buffer has additional
4140 * FF_INPUT_PADDING_SIZE at the end which will always memset to 0.
4143 void av_fast_padded_malloc(void *ptr, unsigned int *size, size_t min_size);
4146 * Copy image src to dst. Wraps av_picture_data_copy() above.
4148 void av_picture_copy(AVPicture *dst, const AVPicture *src,
4149 enum PixelFormat pix_fmt, int width, int height);
4152 * Crop image top and left side.
4154 int av_picture_crop(AVPicture *dst, const AVPicture *src,
4155 enum PixelFormat pix_fmt, int top_band, int left_band);
4160 int av_picture_pad(AVPicture *dst, const AVPicture *src, int height, int width, enum PixelFormat pix_fmt,
4161 int padtop, int padbottom, int padleft, int padright, int *color);
4164 * Encode extradata length to a buffer. Used by xiph codecs.
4166 * @param s buffer to write to; must be at least (v/255+1) bytes long
4167 * @param v size of extradata in bytes
4168 * @return number of bytes written to the buffer.
4170 unsigned int av_xiphlacing(unsigned char *s, unsigned int v);
4173 * Log a generic warning message about a missing feature. This function is
4174 * intended to be used internally by Libav (libavcodec, libavformat, etc.)
4175 * only, and would normally not be used by applications.
4176 * @param[in] avc a pointer to an arbitrary struct of which the first field is
4177 * a pointer to an AVClass struct
4178 * @param[in] feature string containing the name of the missing feature
4179 * @param[in] want_sample indicates if samples are wanted which exhibit this feature.
4180 * If want_sample is non-zero, additional verbage will be added to the log
4181 * message which tells the user how to report samples to the development
4184 void av_log_missing_feature(void *avc, const char *feature, int want_sample);
4187 * Log a generic warning message asking for a sample. This function is
4188 * intended to be used internally by Libav (libavcodec, libavformat, etc.)
4189 * only, and would normally not be used by applications.
4190 * @param[in] avc a pointer to an arbitrary struct of which the first field is
4191 * a pointer to an AVClass struct
4192 * @param[in] msg string containing an optional message, or NULL if no message
4194 void av_log_ask_for_sample(void *avc, const char *msg, ...) av_printf_format(2, 3);
4197 * Register the hardware accelerator hwaccel.
4199 void av_register_hwaccel(AVHWAccel *hwaccel);
4202 * If hwaccel is NULL, returns the first registered hardware accelerator,
4203 * if hwaccel is non-NULL, returns the next registered hardware accelerator
4204 * after hwaccel, or NULL if hwaccel is the last one.
4206 AVHWAccel *av_hwaccel_next(AVHWAccel *hwaccel);
4210 * Lock operation used by lockmgr
4213 AV_LOCK_CREATE, ///< Create a mutex
4214 AV_LOCK_OBTAIN, ///< Lock the mutex
4215 AV_LOCK_RELEASE, ///< Unlock the mutex
4216 AV_LOCK_DESTROY, ///< Free mutex resources
4220 * Register a user provided lock manager supporting the operations
4221 * specified by AVLockOp. mutex points to a (void *) where the
4222 * lockmgr should store/get a pointer to a user allocated mutex. It's
4223 * NULL upon AV_LOCK_CREATE and != NULL for all other ops.
4225 * @param cb User defined callback. Note: Libav may invoke calls to this
4226 * callback during the call to av_lockmgr_register().
4227 * Thus, the application must be prepared to handle that.
4228 * If cb is set to NULL the lockmgr will be unregistered.
4229 * Also note that during unregistration the previously registered
4230 * lockmgr callback may also be invoked.
4232 int av_lockmgr_register(int (*cb)(void **mutex, enum AVLockOp op));
4235 * Get the type of the given codec.
4237 enum AVMediaType avcodec_get_type(enum CodecID codec_id);
4240 * Get the AVClass for AVCodecContext. It can be used in combination with
4241 * AV_OPT_SEARCH_FAKE_OBJ for examining options.
4243 * @see av_opt_find().
4245 const AVClass *avcodec_get_class(void);
4248 * @return a positive value if s is open (i.e. avcodec_open2() was called on it
4249 * with no corresponding avcodec_close()), 0 otherwise.
4251 int avcodec_is_open(AVCodecContext *s);
4253 #endif /* AVCODEC_AVCODEC_H */