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_CBP_RD 0x04000000 ///< Use rate distortion optimization for cbp.
565 #define CODEC_FLAG_QP_RD 0x08000000 ///< Use rate distortion optimization for qp selectioon.
566 #define CODEC_FLAG_LOOP_FILTER 0x00000800 ///< loop filter
567 #define CODEC_FLAG_INTERLACED_ME 0x20000000 ///< interlaced motion estimation
568 #define CODEC_FLAG_CLOSED_GOP 0x80000000
569 #define CODEC_FLAG2_FAST 0x00000001 ///< Allow non spec compliant speedup tricks.
570 #define CODEC_FLAG2_STRICT_GOP 0x00000002 ///< Strictly enforce GOP size.
571 #define CODEC_FLAG2_NO_OUTPUT 0x00000004 ///< Skip bitstream encoding.
572 #define CODEC_FLAG2_LOCAL_HEADER 0x00000008 ///< Place global headers at every keyframe instead of in extradata.
573 #define CODEC_FLAG2_SKIP_RD 0x00004000 ///< RD optimal MB level residual skipping
574 #define CODEC_FLAG2_CHUNKS 0x00008000 ///< Input bitstream might be truncated at a packet boundaries instead of only at frame boundaries.
576 /* Unsupported options :
577 * Syntax Arithmetic coding (SAC)
578 * Reference Picture Selection
579 * Independent Segment Decoding */
581 /* codec capabilities */
583 #define CODEC_CAP_DRAW_HORIZ_BAND 0x0001 ///< Decoder can use draw_horiz_band callback.
585 * Codec uses get_buffer() for allocating buffers and supports custom allocators.
586 * If not set, it might not use get_buffer() at all or use operations that
587 * assume the buffer was allocated by avcodec_default_get_buffer.
589 #define CODEC_CAP_DR1 0x0002
590 #define CODEC_CAP_TRUNCATED 0x0008
591 /* Codec can export data for HW decoding (XvMC). */
592 #define CODEC_CAP_HWACCEL 0x0010
594 * Encoder or decoder requires flushing with NULL input at the end in order to
595 * give the complete and correct output.
597 * NOTE: If this flag is not set, the codec is guaranteed to never be fed with
598 * with NULL data. The user can still send NULL data to the public encode
599 * or decode function, but libavcodec will not pass it along to the codec
600 * unless this flag is set.
603 * The decoder has a non-zero delay and needs to be fed with avpkt->data=NULL,
604 * avpkt->size=0 at the end to get the delayed data until the decoder no longer
608 * The encoder needs to be fed with NULL data at the end of encoding until the
609 * encoder no longer returns data.
611 * NOTE: For encoders implementing the AVCodec.encode2() function, setting this
612 * flag also means that the encoder must set the pts and duration for
613 * each output packet. If this flag is not set, the pts and duration will
614 * be determined by libavcodec from the input frame.
616 #define CODEC_CAP_DELAY 0x0020
618 * Codec can be fed a final frame with a smaller size.
619 * This can be used to prevent truncation of the last audio samples.
621 #define CODEC_CAP_SMALL_LAST_FRAME 0x0040
623 * Codec can export data for HW decoding (VDPAU).
625 #define CODEC_CAP_HWACCEL_VDPAU 0x0080
627 * Codec can output multiple frames per AVPacket
628 * Normally demuxers return one frame at a time, demuxers which do not do
629 * are connected to a parser to split what they return into proper frames.
630 * This flag is reserved to the very rare category of codecs which have a
631 * bitstream that cannot be split into frames without timeconsuming
632 * operations like full decoding. Demuxers carring such bitstreams thus
633 * may return multiple frames in a packet. This has many disadvantages like
634 * prohibiting stream copy in many cases thus it should only be considered
637 #define CODEC_CAP_SUBFRAMES 0x0100
639 * Codec is experimental and is thus avoided in favor of non experimental
642 #define CODEC_CAP_EXPERIMENTAL 0x0200
644 * Codec should fill in channel configuration and samplerate instead of container
646 #define CODEC_CAP_CHANNEL_CONF 0x0400
648 * Codec is able to deal with negative linesizes
650 #define CODEC_CAP_NEG_LINESIZES 0x0800
652 * Codec supports frame-level multithreading.
654 #define CODEC_CAP_FRAME_THREADS 0x1000
656 * Codec supports slice-based (or partition-based) multithreading.
658 #define CODEC_CAP_SLICE_THREADS 0x2000
660 * Codec supports changed parameters at any point.
662 #define CODEC_CAP_PARAM_CHANGE 0x4000
664 * Codec supports avctx->thread_count == 0 (auto).
666 #define CODEC_CAP_AUTO_THREADS 0x8000
668 * Audio encoder supports receiving a different number of samples in each call.
670 #define CODEC_CAP_VARIABLE_FRAME_SIZE 0x10000
672 //The following defines may change, don't expect compatibility if you use them.
673 #define MB_TYPE_INTRA4x4 0x0001
674 #define MB_TYPE_INTRA16x16 0x0002 //FIXME H.264-specific
675 #define MB_TYPE_INTRA_PCM 0x0004 //FIXME H.264-specific
676 #define MB_TYPE_16x16 0x0008
677 #define MB_TYPE_16x8 0x0010
678 #define MB_TYPE_8x16 0x0020
679 #define MB_TYPE_8x8 0x0040
680 #define MB_TYPE_INTERLACED 0x0080
681 #define MB_TYPE_DIRECT2 0x0100 //FIXME
682 #define MB_TYPE_ACPRED 0x0200
683 #define MB_TYPE_GMC 0x0400
684 #define MB_TYPE_SKIP 0x0800
685 #define MB_TYPE_P0L0 0x1000
686 #define MB_TYPE_P1L0 0x2000
687 #define MB_TYPE_P0L1 0x4000
688 #define MB_TYPE_P1L1 0x8000
689 #define MB_TYPE_L0 (MB_TYPE_P0L0 | MB_TYPE_P1L0)
690 #define MB_TYPE_L1 (MB_TYPE_P0L1 | MB_TYPE_P1L1)
691 #define MB_TYPE_L0L1 (MB_TYPE_L0 | MB_TYPE_L1)
692 #define MB_TYPE_QUANT 0x00010000
693 #define MB_TYPE_CBP 0x00020000
694 //Note bits 24-31 are reserved for codec specific use (h264 ref0, mpeg1 0mv, ...)
698 * This specifies the area which should be displayed.
699 * Note there may be multiple such areas for one frame.
701 typedef struct AVPanScan{
704 * - encoding: Set by user.
705 * - decoding: Set by libavcodec.
710 * width and height in 1/16 pel
711 * - encoding: Set by user.
712 * - decoding: Set by libavcodec.
718 * position of the top left corner in 1/16 pel for up to 3 fields/frames
719 * - encoding: Set by user.
720 * - decoding: Set by libavcodec.
722 int16_t position[3][2];
725 #define FF_QSCALE_TYPE_MPEG1 0
726 #define FF_QSCALE_TYPE_MPEG2 1
727 #define FF_QSCALE_TYPE_H264 2
728 #define FF_QSCALE_TYPE_VP56 3
730 #define FF_BUFFER_TYPE_INTERNAL 1
731 #define FF_BUFFER_TYPE_USER 2 ///< direct rendering buffers (image is (de)allocated by user)
732 #define FF_BUFFER_TYPE_SHARED 4 ///< Buffer from somewhere else; don't deallocate image (data/base), all other tables are not shared.
733 #define FF_BUFFER_TYPE_COPY 8 ///< Just a (modified) copy of some other buffer, don't deallocate anything.
735 #define FF_BUFFER_HINTS_VALID 0x01 // Buffer hints value is meaningful (if 0 ignore).
736 #define FF_BUFFER_HINTS_READABLE 0x02 // Codec will read from buffer.
737 #define FF_BUFFER_HINTS_PRESERVE 0x04 // User must not alter buffer content.
738 #define FF_BUFFER_HINTS_REUSABLE 0x08 // Codec will reuse the buffer (update).
740 enum AVPacketSideDataType {
742 AV_PKT_DATA_NEW_EXTRADATA,
743 AV_PKT_DATA_PARAM_CHANGE,
746 typedef struct AVPacket {
748 * Presentation timestamp in AVStream->time_base units; the time at which
749 * the decompressed packet will be presented to the user.
750 * Can be AV_NOPTS_VALUE if it is not stored in the file.
751 * pts MUST be larger or equal to dts as presentation cannot happen before
752 * decompression, unless one wants to view hex dumps. Some formats misuse
753 * the terms dts and pts/cts to mean something different. Such timestamps
754 * must be converted to true pts/dts before they are stored in AVPacket.
758 * Decompression timestamp in AVStream->time_base units; the time at which
759 * the packet is decompressed.
760 * Can be AV_NOPTS_VALUE if it is not stored in the file.
767 * A combination of AV_PKT_FLAG values
771 * Additional packet data that can be provided by the container.
772 * Packet can contain several types of side information.
777 enum AVPacketSideDataType type;
782 * Duration of this packet in AVStream->time_base units, 0 if unknown.
783 * Equals next_pts - this_pts in presentation order.
786 void (*destruct)(struct AVPacket *);
788 int64_t pos; ///< byte position in stream, -1 if unknown
791 * Time difference in AVStream->time_base units from the pts of this
792 * packet to the point at which the output from the decoder has converged
793 * independent from the availability of previous frames. That is, the
794 * frames are virtually identical no matter if decoding started from
795 * the very first frame or from this keyframe.
796 * Is AV_NOPTS_VALUE if unknown.
797 * This field is not the display duration of the current packet.
798 * This field has no meaning if the packet does not have AV_PKT_FLAG_KEY
801 * The purpose of this field is to allow seeking in streams that have no
802 * keyframes in the conventional sense. It corresponds to the
803 * recovery point SEI in H.264 and match_time_delta in NUT. It is also
804 * essential for some types of subtitle streams to ensure that all
805 * subtitles are correctly displayed after seeking.
807 int64_t convergence_duration;
809 #define AV_PKT_FLAG_KEY 0x0001 ///< The packet contains a keyframe
810 #define AV_PKT_FLAG_CORRUPT 0x0002 ///< The packet content is corrupted
813 * An AV_PKT_DATA_PARAM_CHANGE side data packet is laid out as follows:
815 * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_COUNT)
816 * s32le channel_count
817 * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_LAYOUT)
818 * u64le channel_layout
819 * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_SAMPLE_RATE)
821 * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_DIMENSIONS)
826 enum AVSideDataParamChangeFlags {
827 AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_COUNT = 0x0001,
828 AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_LAYOUT = 0x0002,
829 AV_SIDE_DATA_PARAM_CHANGE_SAMPLE_RATE = 0x0004,
830 AV_SIDE_DATA_PARAM_CHANGE_DIMENSIONS = 0x0008,
835 * New fields can be added to the end of AVFRAME with minor version
836 * bumps. Removal, reordering and changes to existing fields require
837 * a major version bump.
838 * sizeof(AVFrame) must not be used outside libav*.
840 typedef struct AVFrame {
841 #define AV_NUM_DATA_POINTERS 8
843 * pointer to the picture/channel planes.
844 * This might be different from the first allocated byte
845 * - encoding: Set by user
846 * - decoding: set by AVCodecContext.get_buffer()
848 uint8_t *data[AV_NUM_DATA_POINTERS];
851 * Size, in bytes, of the data for each picture/channel plane.
853 * For audio, only linesize[0] may be set. For planar audio, each channel
854 * plane must be the same size.
856 * - encoding: Set by user
857 * - decoding: set by AVCodecContext.get_buffer()
859 int linesize[AV_NUM_DATA_POINTERS];
862 * pointers to the data planes/channels.
864 * For video, this should simply point to data[].
866 * For planar audio, each channel has a separate data pointer, and
867 * linesize[0] contains the size of each channel buffer.
868 * For packed audio, there is just one data pointer, and linesize[0]
869 * contains the total size of the buffer for all channels.
871 * Note: Both data and extended_data will always be set by get_buffer(),
872 * but for planar audio with more channels that can fit in data,
873 * extended_data must be used by the decoder in order to access all
877 * decoding: set by AVCodecContext.get_buffer()
879 uint8_t **extended_data;
882 * width and height of the video frame
884 * - decoding: Read by user.
889 * number of audio samples (per channel) described by this frame
890 * - encoding: Set by user
891 * - decoding: Set by libavcodec
896 * format of the frame, -1 if unknown or unset
897 * Values correspond to enum PixelFormat for video frames,
898 * enum AVSampleFormat for audio)
900 * - decoding: Read by user.
905 * 1 -> keyframe, 0-> not
906 * - encoding: Set by libavcodec.
907 * - decoding: Set by libavcodec.
912 * Picture type of the frame, see ?_TYPE below.
913 * - encoding: Set by libavcodec. for coded_picture (and set by user for input).
914 * - decoding: Set by libavcodec.
916 enum AVPictureType pict_type;
919 * pointer to the first allocated byte of the picture. Can be used in get_buffer/release_buffer.
920 * This isn't used by libavcodec unless the default get/release_buffer() is used.
924 uint8_t *base[AV_NUM_DATA_POINTERS];
927 * sample aspect ratio for the video frame, 0/1 if unknown\unspecified
929 * - decoding: Read by user.
931 AVRational sample_aspect_ratio;
934 * presentation timestamp in time_base units (time when frame should be shown to user)
935 * If AV_NOPTS_VALUE then frame_rate = 1/time_base will be assumed.
936 * - encoding: MUST be set by user.
937 * - decoding: Set by libavcodec.
942 * reordered pts from the last AVPacket that has been input into the decoder
944 * - decoding: Read by user.
949 * dts from the last AVPacket that has been input into the decoder
951 * - decoding: Read by user.
956 * picture number in bitstream order
958 * - decoding: Set by libavcodec.
960 int coded_picture_number;
962 * picture number in display order
964 * - decoding: Set by libavcodec.
966 int display_picture_number;
969 * quality (between 1 (good) and FF_LAMBDA_MAX (bad))
970 * - encoding: Set by libavcodec. for coded_picture (and set by user for input).
971 * - decoding: Set by libavcodec.
976 * is this picture used as reference
977 * The values for this are the same as the MpegEncContext.picture_structure
978 * variable, that is 1->top field, 2->bottom field, 3->frame/both fields.
979 * Set to 4 for delayed, non-reference frames.
981 * - decoding: Set by libavcodec. (before get_buffer() call)).
988 * - decoding: Set by libavcodec.
990 int8_t *qscale_table;
994 * - decoding: Set by libavcodec.
1004 * mbskip_table[mb]>=1 if MB didn't change
1005 * stride= mb_width = (width+15)>>4
1006 * - encoding: unused
1007 * - decoding: Set by libavcodec.
1009 uint8_t *mbskip_table;
1012 * motion vector table
1015 * int mv_sample_log2= 4 - motion_subsample_log2;
1016 * int mb_width= (width+15)>>4;
1017 * int mv_stride= (mb_width << mv_sample_log2) + 1;
1018 * motion_val[direction][x + y*mv_stride][0->mv_x, 1->mv_y];
1020 * - encoding: Set by user.
1021 * - decoding: Set by libavcodec.
1023 int16_t (*motion_val[2])[2];
1026 * macroblock type table
1027 * mb_type_base + mb_width + 2
1028 * - encoding: Set by user.
1029 * - decoding: Set by libavcodec.
1035 * - encoding: unused
1036 * - decoding: Set by libavcodec.
1041 * motion reference frame index
1042 * the order in which these are stored can depend on the codec.
1043 * - encoding: Set by user.
1044 * - decoding: Set by libavcodec.
1046 int8_t *ref_index[2];
1049 * for some private data of the user
1050 * - encoding: unused
1051 * - decoding: Set by user.
1057 * - encoding: Set by libavcodec. if flags&CODEC_FLAG_PSNR.
1058 * - decoding: unused
1060 uint64_t error[AV_NUM_DATA_POINTERS];
1063 * type of the buffer (to keep track of who has to deallocate data[*])
1064 * - encoding: Set by the one who allocates it.
1065 * - decoding: Set by the one who allocates it.
1066 * Note: User allocated (direct rendering) & internal buffers cannot coexist currently.
1071 * When decoding, this signals how much the picture must be delayed.
1072 * extra_delay = repeat_pict / (2*fps)
1073 * - encoding: unused
1074 * - decoding: Set by libavcodec.
1079 * The content of the picture is interlaced.
1080 * - encoding: Set by user.
1081 * - decoding: Set by libavcodec. (default 0)
1083 int interlaced_frame;
1086 * If the content is interlaced, is top field displayed first.
1087 * - encoding: Set by user.
1088 * - decoding: Set by libavcodec.
1090 int top_field_first;
1093 * Tell user application that palette has changed from previous frame.
1094 * - encoding: ??? (no palette-enabled encoder yet)
1095 * - decoding: Set by libavcodec. (default 0).
1097 int palette_has_changed;
1100 * codec suggestion on buffer type if != 0
1101 * - encoding: unused
1102 * - decoding: Set by libavcodec. (before get_buffer() call)).
1108 * - encoding: Set by user.
1109 * - decoding: Set by libavcodec.
1111 AVPanScan *pan_scan;
1114 * reordered opaque 64bit (generally an integer or a double precision float
1115 * PTS but can be anything).
1116 * The user sets AVCodecContext.reordered_opaque to represent the input at
1118 * the decoder reorders values as needed and sets AVFrame.reordered_opaque
1119 * to exactly one of the values provided by the user through AVCodecContext.reordered_opaque
1120 * @deprecated in favor of pkt_pts
1121 * - encoding: unused
1122 * - decoding: Read by user.
1124 int64_t reordered_opaque;
1127 * hardware accelerator private data (Libav-allocated)
1128 * - encoding: unused
1129 * - decoding: Set by libavcodec
1131 void *hwaccel_picture_private;
1134 * the AVCodecContext which ff_thread_get_buffer() was last called on
1135 * - encoding: Set by libavcodec.
1136 * - decoding: Set by libavcodec.
1138 struct AVCodecContext *owner;
1141 * used by multithreading to store frame-specific info
1142 * - encoding: Set by libavcodec.
1143 * - decoding: Set by libavcodec.
1145 void *thread_opaque;
1148 * log2 of the size of the block which a single vector in motion_val represents:
1149 * (4->16x16, 3->8x8, 2-> 4x4, 1-> 2x2)
1150 * - encoding: unused
1151 * - decoding: Set by libavcodec.
1153 uint8_t motion_subsample_log2;
1156 struct AVCodecInternal;
1160 AV_FIELD_PROGRESSIVE,
1161 AV_FIELD_TT, //< Top coded_first, top displayed first
1162 AV_FIELD_BB, //< Bottom coded first, bottom displayed first
1163 AV_FIELD_TB, //< Top coded first, bottom displayed first
1164 AV_FIELD_BT, //< Bottom coded first, top displayed first
1168 * main external API structure.
1169 * New fields can be added to the end with minor version bumps.
1170 * Removal, reordering and changes to existing fields require a major
1172 * sizeof(AVCodecContext) must not be used outside libav*.
1174 typedef struct AVCodecContext {
1176 * information on struct for av_log
1177 * - set by avcodec_alloc_context3
1179 const AVClass *av_class;
1181 * the average bitrate
1182 * - encoding: Set by user; unused for constant quantizer encoding.
1183 * - decoding: Set by libavcodec. 0 or some bitrate if this info is available in the stream.
1188 * number of bits the bitstream is allowed to diverge from the reference.
1189 * the reference can be CBR (for CBR pass1) or VBR (for pass2)
1190 * - encoding: Set by user; unused for constant quantizer encoding.
1191 * - decoding: unused
1193 int bit_rate_tolerance;
1197 * - encoding: Set by user.
1198 * - decoding: Set by user.
1203 * Some codecs need additional format info. It is stored here.
1204 * If any muxer uses this then ALL demuxers/parsers AND encoders for the
1205 * specific codec MUST set it correctly otherwise stream copy breaks.
1206 * In general use of this field by muxers is not recommended.
1207 * - encoding: Set by libavcodec.
1208 * - decoding: Set by libavcodec. (FIXME: Is this OK?)
1213 * Motion estimation algorithm used for video coding.
1214 * 1 (zero), 2 (full), 3 (log), 4 (phods), 5 (epzs), 6 (x1), 7 (hex),
1215 * 8 (umh), 9 (iter), 10 (tesa) [7, 8, 10 are x264 specific, 9 is snow specific]
1216 * - encoding: MUST be set by user.
1217 * - decoding: unused
1222 * some codecs need / can use extradata like Huffman tables.
1223 * mjpeg: Huffman tables
1224 * rv10: additional flags
1225 * mpeg4: global headers (they can be in the bitstream or here)
1226 * The allocated memory should be FF_INPUT_BUFFER_PADDING_SIZE bytes larger
1227 * than extradata_size to avoid prolems if it is read with the bitstream reader.
1228 * The bytewise contents of extradata must not depend on the architecture or CPU endianness.
1229 * - encoding: Set/allocated/freed by libavcodec.
1230 * - decoding: Set/allocated/freed by user.
1236 * This is the fundamental unit of time (in seconds) in terms
1237 * of which frame timestamps are represented. For fixed-fps content,
1238 * timebase should be 1/framerate and timestamp increments should be
1240 * - encoding: MUST be set by user.
1241 * - decoding: Set by libavcodec.
1243 AVRational time_base;
1247 * picture width / height.
1248 * - encoding: MUST be set by user.
1249 * - decoding: Set by libavcodec.
1250 * Note: For compatibility it is possible to set this instead of
1251 * coded_width/height before decoding.
1255 #define FF_ASPECT_EXTENDED 15
1258 * the number of pictures in a group of pictures, or 0 for intra_only
1259 * - encoding: Set by user.
1260 * - decoding: unused
1265 * Pixel format, see PIX_FMT_xxx.
1266 * May be set by the demuxer if known from headers.
1267 * May be overriden by the decoder if it knows better.
1268 * - encoding: Set by user.
1269 * - decoding: Set by user if known, overridden by libavcodec if known
1271 enum PixelFormat pix_fmt;
1274 * If non NULL, 'draw_horiz_band' is called by the libavcodec
1275 * decoder to draw a horizontal band. It improves cache usage. Not
1276 * all codecs can do that. You must check the codec capabilities
1278 * When multithreading is used, it may be called from multiple threads
1279 * at the same time; threads might draw different parts of the same AVFrame,
1280 * or multiple AVFrames, and there is no guarantee that slices will be drawn
1282 * The function is also used by hardware acceleration APIs.
1283 * It is called at least once during frame decoding to pass
1284 * the data needed for hardware render.
1285 * In that mode instead of pixel data, AVFrame points to
1286 * a structure specific to the acceleration API. The application
1287 * reads the structure and can change some fields to indicate progress
1289 * - encoding: unused
1290 * - decoding: Set by user.
1291 * @param height the height of the slice
1292 * @param y the y position of the slice
1293 * @param type 1->top field, 2->bottom field, 3->frame
1294 * @param offset offset into the AVFrame.data from which the slice should be read
1296 void (*draw_horiz_band)(struct AVCodecContext *s,
1297 const AVFrame *src, int offset[AV_NUM_DATA_POINTERS],
1298 int y, int type, int height);
1301 int sample_rate; ///< samples per second
1302 int channels; ///< number of audio channels
1305 * audio sample format
1306 * - encoding: Set by user.
1307 * - decoding: Set by libavcodec.
1309 enum AVSampleFormat sample_fmt; ///< sample format
1311 /* The following data should not be initialized. */
1313 * Samples per packet, initialized when calling 'init'.
1316 int frame_number; ///< audio or video frame number
1322 * Number of frames the decoded output will be delayed relative to the
1326 * Number of "priming" samples added to the beginning of the stream
1327 * during encoding. The decoded output will be delayed by this many
1328 * samples relative to the input to the encoder. Note that this field is
1329 * purely informational and does not directly affect the pts output by
1330 * the encoder, which should always be based on the actual presentation
1331 * time, including any delay.
1333 * - encoding: Set by libavcodec.
1334 * - decoding: unused
1338 /* - encoding parameters */
1339 float qcompress; ///< amount of qscale change between easy & hard scenes (0.0-1.0)
1340 float qblur; ///< amount of qscale smoothing over time (0.0-1.0)
1344 * - encoding: Set by user.
1345 * - decoding: unused
1351 * - encoding: Set by user.
1352 * - decoding: unused
1357 * maximum quantizer difference between frames
1358 * - encoding: Set by user.
1359 * - decoding: unused
1364 * maximum number of B-frames between non-B-frames
1365 * Note: The output will be delayed by max_b_frames+1 relative to the input.
1366 * - encoding: Set by user.
1367 * - decoding: unused
1372 * qscale factor between IP and B-frames
1373 * If > 0 then the last P-frame quantizer will be used (q= lastp_q*factor+offset).
1374 * If < 0 then normal ratecontrol will be done (q= -normal_q*factor+offset).
1375 * - encoding: Set by user.
1376 * - decoding: unused
1378 float b_quant_factor;
1380 /** obsolete FIXME remove */
1382 #define FF_RC_STRATEGY_XVID 1
1384 int b_frame_strategy;
1386 struct AVCodec *codec;
1390 int rtp_payload_size; /* The size of the RTP payload: the coder will */
1391 /* do its best to deliver a chunk with size */
1392 /* below rtp_payload_size, the chunk will start */
1393 /* with a start code on some codecs like H.263. */
1394 /* This doesn't take account of any particular */
1395 /* headers inside the transmitted RTP payload. */
1398 /* The RTP callback: This function is called */
1399 /* every time the encoder has a packet to send. */
1400 /* It depends on the encoder if the data starts */
1401 /* with a Start Code (it should). H.263 does. */
1402 /* mb_nb contains the number of macroblocks */
1403 /* encoded in the RTP payload. */
1404 void (*rtp_callback)(struct AVCodecContext *avctx, void *data, int size, int mb_nb);
1406 /* statistics, used for 2-pass encoding */
1417 * number of bits used for the previously encoded frame
1418 * - encoding: Set by libavcodec.
1419 * - decoding: unused
1424 * Private data of the user, can be used to carry app specific stuff.
1425 * - encoding: Set by user.
1426 * - decoding: Set by user.
1430 char codec_name[32];
1431 enum AVMediaType codec_type; /* see AVMEDIA_TYPE_xxx */
1432 enum CodecID codec_id; /* see CODEC_ID_xxx */
1435 * fourcc (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A').
1436 * This is used to work around some encoder bugs.
1437 * A demuxer should set this to what is stored in the field used to identify the codec.
1438 * If there are multiple such fields in a container then the demuxer should choose the one
1439 * which maximizes the information about the used codec.
1440 * If the codec tag field in a container is larger than 32 bits then the demuxer should
1441 * remap the longer ID to 32 bits with a table or other structure. Alternatively a new
1442 * extra_codec_tag + size could be added but for this a clear advantage must be demonstrated
1444 * - encoding: Set by user, if not then the default based on codec_id will be used.
1445 * - decoding: Set by user, will be converted to uppercase by libavcodec during init.
1447 unsigned int codec_tag;
1450 * Work around bugs in encoders which sometimes cannot be detected automatically.
1451 * - encoding: Set by user
1452 * - decoding: Set by user
1454 int workaround_bugs;
1455 #define FF_BUG_AUTODETECT 1 ///< autodetection
1456 #define FF_BUG_OLD_MSMPEG4 2
1457 #define FF_BUG_XVID_ILACE 4
1458 #define FF_BUG_UMP4 8
1459 #define FF_BUG_NO_PADDING 16
1460 #define FF_BUG_AMV 32
1461 #define FF_BUG_AC_VLC 0 ///< Will be removed, libavcodec can now handle these non-compliant files by default.
1462 #define FF_BUG_QPEL_CHROMA 64
1463 #define FF_BUG_STD_QPEL 128
1464 #define FF_BUG_QPEL_CHROMA2 256
1465 #define FF_BUG_DIRECT_BLOCKSIZE 512
1466 #define FF_BUG_EDGE 1024
1467 #define FF_BUG_HPEL_CHROMA 2048
1468 #define FF_BUG_DC_CLIP 4096
1469 #define FF_BUG_MS 8192 ///< Work around various bugs in Microsoft's broken decoders.
1470 #define FF_BUG_TRUNCATED 16384
1473 * luma single coefficient elimination threshold
1474 * - encoding: Set by user.
1475 * - decoding: unused
1477 int luma_elim_threshold;
1480 * chroma single coeff elimination threshold
1481 * - encoding: Set by user.
1482 * - decoding: unused
1484 int chroma_elim_threshold;
1487 * strictly follow the standard (MPEG4, ...).
1488 * - encoding: Set by user.
1489 * - decoding: Set by user.
1490 * Setting this to STRICT or higher means the encoder and decoder will
1491 * generally do stupid things, whereas setting it to unofficial or lower
1492 * will mean the encoder might produce output that is not supported by all
1493 * spec-compliant decoders. Decoders don't differentiate between normal,
1494 * unofficial and experimental (that is, they always try to decode things
1495 * when they can) unless they are explicitly asked to behave stupidly
1496 * (=strictly conform to the specs)
1498 int strict_std_compliance;
1499 #define FF_COMPLIANCE_VERY_STRICT 2 ///< Strictly conform to an older more strict version of the spec or reference software.
1500 #define FF_COMPLIANCE_STRICT 1 ///< Strictly conform to all the things in the spec no matter what consequences.
1501 #define FF_COMPLIANCE_NORMAL 0
1502 #define FF_COMPLIANCE_UNOFFICIAL -1 ///< Allow unofficial extensions
1503 #define FF_COMPLIANCE_EXPERIMENTAL -2 ///< Allow nonstandardized experimental things.
1506 * qscale offset between IP and B-frames
1507 * - encoding: Set by user.
1508 * - decoding: unused
1510 float b_quant_offset;
1513 * Called at the beginning of each frame to get a buffer for it.
1515 * The function will set AVFrame.data[], AVFrame.linesize[].
1516 * AVFrame.extended_data[] must also be set, but it should be the same as
1517 * AVFrame.data[] except for planar audio with more channels than can fit
1518 * in AVFrame.data[]. In that case, AVFrame.data[] shall still contain as
1519 * many data pointers as it can hold.
1521 * if CODEC_CAP_DR1 is not set then get_buffer() must call
1522 * avcodec_default_get_buffer() instead of providing buffers allocated by
1525 * AVFrame.data[] should be 32- or 16-byte-aligned unless the CPU doesn't
1526 * need it. avcodec_default_get_buffer() aligns the output buffer properly,
1527 * but if get_buffer() is overridden then alignment considerations should
1528 * be taken into account.
1530 * @see avcodec_default_get_buffer()
1534 * If pic.reference is set then the frame will be read later by libavcodec.
1535 * avcodec_align_dimensions2() should be used to find the required width and
1536 * height, as they normally need to be rounded up to the next multiple of 16.
1538 * If frame multithreading is used and thread_safe_callbacks is set,
1539 * it may be called from a different thread, but not from more than one at
1540 * once. Does not need to be reentrant.
1542 * @see release_buffer(), reget_buffer()
1543 * @see avcodec_align_dimensions2()
1547 * Decoders request a buffer of a particular size by setting
1548 * AVFrame.nb_samples prior to calling get_buffer(). The decoder may,
1549 * however, utilize only part of the buffer by setting AVFrame.nb_samples
1550 * to a smaller value in the output frame.
1552 * Decoders cannot use the buffer after returning from
1553 * avcodec_decode_audio4(), so they will not call release_buffer(), as it
1554 * is assumed to be released immediately upon return.
1556 * As a convenience, av_samples_get_buffer_size() and
1557 * av_samples_fill_arrays() in libavutil may be used by custom get_buffer()
1558 * functions to find the required data size and to fill data pointers and
1559 * linesize. In AVFrame.linesize, only linesize[0] may be set for audio
1560 * since all planes must be the same size.
1562 * @see av_samples_get_buffer_size(), av_samples_fill_arrays()
1564 * - encoding: unused
1565 * - decoding: Set by libavcodec, user can override.
1567 int (*get_buffer)(struct AVCodecContext *c, AVFrame *pic);
1570 * Called to release buffers which were allocated with get_buffer.
1571 * A released buffer can be reused in get_buffer().
1572 * pic.data[*] must be set to NULL.
1573 * May be called from a different thread if frame multithreading is used,
1574 * but not by more than one thread at once, so does not need to be reentrant.
1575 * - encoding: unused
1576 * - decoding: Set by libavcodec, user can override.
1578 void (*release_buffer)(struct AVCodecContext *c, AVFrame *pic);
1581 * Size of the frame reordering buffer in the decoder.
1582 * For MPEG-2 it is 1 IPB or 0 low delay IP.
1583 * - encoding: Set by libavcodec.
1584 * - decoding: Set by libavcodec.
1589 * number of bytes per packet if constant and known or 0
1590 * Used by some WAV based audio codecs.
1595 * 0-> h263 quant 1-> mpeg quant
1596 * - encoding: Set by user.
1597 * - decoding: unused
1602 * pass1 encoding statistics output buffer
1603 * - encoding: Set by libavcodec.
1604 * - decoding: unused
1609 * pass2 encoding statistics input buffer
1610 * Concatenated stuff from stats_out of pass1 should be placed here.
1611 * - encoding: Allocated/set/freed by user.
1612 * - decoding: unused
1617 * ratecontrol qmin qmax limiting method
1618 * 0-> clipping, 1-> use a nice continous function to limit qscale wthin qmin/qmax.
1619 * - encoding: Set by user.
1620 * - decoding: unused
1628 * ratecontrol override, see RcOverride
1629 * - encoding: Allocated/set/freed by user.
1630 * - decoding: unused
1632 RcOverride *rc_override;
1633 int rc_override_count;
1636 * rate control equation
1637 * - encoding: Set by user
1638 * - decoding: unused
1644 * - encoding: Set by user.
1645 * - decoding: unused
1651 * - encoding: Set by user.
1652 * - decoding: unused
1657 * decoder bitstream buffer size
1658 * - encoding: Set by user.
1659 * - decoding: unused
1662 float rc_buffer_aggressivity;
1665 * qscale factor between P and I-frames
1666 * If > 0 then the last p frame quantizer will be used (q= lastp_q*factor+offset).
1667 * If < 0 then normal ratecontrol will be done (q= -normal_q*factor+offset).
1668 * - encoding: Set by user.
1669 * - decoding: unused
1671 float i_quant_factor;
1674 * qscale offset between P and I-frames
1675 * - encoding: Set by user.
1676 * - decoding: unused
1678 float i_quant_offset;
1681 * initial complexity for pass1 ratecontrol
1682 * - encoding: Set by user.
1683 * - decoding: unused
1685 float rc_initial_cplx;
1688 * DCT algorithm, see FF_DCT_* below
1689 * - encoding: Set by user.
1690 * - decoding: unused
1693 #define FF_DCT_AUTO 0
1694 #define FF_DCT_FASTINT 1
1695 #define FF_DCT_INT 2
1696 #define FF_DCT_MMX 3
1697 #define FF_DCT_ALTIVEC 5
1698 #define FF_DCT_FAAN 6
1701 * luminance masking (0-> disabled)
1702 * - encoding: Set by user.
1703 * - decoding: unused
1708 * temporary complexity masking (0-> disabled)
1709 * - encoding: Set by user.
1710 * - decoding: unused
1712 float temporal_cplx_masking;
1715 * spatial complexity masking (0-> disabled)
1716 * - encoding: Set by user.
1717 * - decoding: unused
1719 float spatial_cplx_masking;
1722 * p block masking (0-> disabled)
1723 * - encoding: Set by user.
1724 * - decoding: unused
1729 * darkness masking (0-> disabled)
1730 * - encoding: Set by user.
1731 * - decoding: unused
1736 * IDCT algorithm, see FF_IDCT_* below.
1737 * - encoding: Set by user.
1738 * - decoding: Set by user.
1741 #define FF_IDCT_AUTO 0
1742 #define FF_IDCT_INT 1
1743 #define FF_IDCT_SIMPLE 2
1744 #define FF_IDCT_SIMPLEMMX 3
1745 #define FF_IDCT_LIBMPEG2MMX 4
1746 #define FF_IDCT_MMI 5
1747 #define FF_IDCT_ARM 7
1748 #define FF_IDCT_ALTIVEC 8
1749 #define FF_IDCT_SH4 9
1750 #define FF_IDCT_SIMPLEARM 10
1751 #define FF_IDCT_H264 11
1752 #define FF_IDCT_VP3 12
1753 #define FF_IDCT_IPP 13
1754 #define FF_IDCT_XVIDMMX 14
1755 #define FF_IDCT_CAVS 15
1756 #define FF_IDCT_SIMPLEARMV5TE 16
1757 #define FF_IDCT_SIMPLEARMV6 17
1758 #define FF_IDCT_SIMPLEVIS 18
1759 #define FF_IDCT_WMV2 19
1760 #define FF_IDCT_FAAN 20
1761 #define FF_IDCT_EA 21
1762 #define FF_IDCT_SIMPLENEON 22
1763 #define FF_IDCT_SIMPLEALPHA 23
1764 #define FF_IDCT_BINK 24
1768 * - encoding: Set by libavcodec.
1769 * - decoding: Set by user (or 0).
1773 * slice offsets in the frame in bytes
1774 * - encoding: Set/allocated by libavcodec.
1775 * - decoding: Set/allocated by user (or NULL).
1780 * error concealment flags
1781 * - encoding: unused
1782 * - decoding: Set by user.
1784 int error_concealment;
1785 #define FF_EC_GUESS_MVS 1
1786 #define FF_EC_DEBLOCK 2
1789 * dsp_mask could be add used to disable unwanted CPU features
1790 * CPU features (i.e. MMX, SSE. ...)
1792 * With the FORCE flag you may instead enable given CPU features.
1793 * (Dangerous: Usable in case of misdetection, improper usage however will
1794 * result into program crash.)
1799 * bits per sample/pixel from the demuxer (needed for huffyuv).
1800 * - encoding: Set by libavcodec.
1801 * - decoding: Set by user.
1803 int bits_per_coded_sample;
1806 * prediction method (needed for huffyuv)
1807 * - encoding: Set by user.
1808 * - decoding: unused
1810 int prediction_method;
1811 #define FF_PRED_LEFT 0
1812 #define FF_PRED_PLANE 1
1813 #define FF_PRED_MEDIAN 2
1816 * sample aspect ratio (0 if unknown)
1817 * That is the width of a pixel divided by the height of the pixel.
1818 * Numerator and denominator must be relatively prime and smaller than 256 for some video standards.
1819 * - encoding: Set by user.
1820 * - decoding: Set by libavcodec.
1822 AVRational sample_aspect_ratio;
1825 * the picture in the bitstream
1826 * - encoding: Set by libavcodec.
1827 * - decoding: Set by libavcodec.
1829 AVFrame *coded_frame;
1833 * - encoding: Set by user.
1834 * - decoding: Set by user.
1837 #define FF_DEBUG_PICT_INFO 1
1838 #define FF_DEBUG_RC 2
1839 #define FF_DEBUG_BITSTREAM 4
1840 #define FF_DEBUG_MB_TYPE 8
1841 #define FF_DEBUG_QP 16
1842 #define FF_DEBUG_MV 32
1843 #define FF_DEBUG_DCT_COEFF 0x00000040
1844 #define FF_DEBUG_SKIP 0x00000080
1845 #define FF_DEBUG_STARTCODE 0x00000100
1846 #define FF_DEBUG_PTS 0x00000200
1847 #define FF_DEBUG_ER 0x00000400
1848 #define FF_DEBUG_MMCO 0x00000800
1849 #define FF_DEBUG_BUGS 0x00001000
1850 #define FF_DEBUG_VIS_QP 0x00002000
1851 #define FF_DEBUG_VIS_MB_TYPE 0x00004000
1852 #define FF_DEBUG_BUFFERS 0x00008000
1853 #define FF_DEBUG_THREADS 0x00010000
1857 * - encoding: Set by user.
1858 * - decoding: Set by user.
1861 #define FF_DEBUG_VIS_MV_P_FOR 0x00000001 //visualize forward predicted MVs of P frames
1862 #define FF_DEBUG_VIS_MV_B_FOR 0x00000002 //visualize forward predicted MVs of B frames
1863 #define FF_DEBUG_VIS_MV_B_BACK 0x00000004 //visualize backward predicted MVs of B frames
1867 * - encoding: Set by libavcodec if flags&CODEC_FLAG_PSNR.
1868 * - decoding: unused
1870 uint64_t error[AV_NUM_DATA_POINTERS];
1873 * motion estimation comparison function
1874 * - encoding: Set by user.
1875 * - decoding: unused
1879 * subpixel motion estimation comparison function
1880 * - encoding: Set by user.
1881 * - decoding: unused
1885 * macroblock comparison function (not supported yet)
1886 * - encoding: Set by user.
1887 * - decoding: unused
1891 * interlaced DCT comparison function
1892 * - encoding: Set by user.
1893 * - decoding: unused
1896 #define FF_CMP_SAD 0
1897 #define FF_CMP_SSE 1
1898 #define FF_CMP_SATD 2
1899 #define FF_CMP_DCT 3
1900 #define FF_CMP_PSNR 4
1901 #define FF_CMP_BIT 5
1903 #define FF_CMP_ZERO 7
1904 #define FF_CMP_VSAD 8
1905 #define FF_CMP_VSSE 9
1906 #define FF_CMP_NSSE 10
1907 #define FF_CMP_W53 11
1908 #define FF_CMP_W97 12
1909 #define FF_CMP_DCTMAX 13
1910 #define FF_CMP_DCT264 14
1911 #define FF_CMP_CHROMA 256
1914 * ME diamond size & shape
1915 * - encoding: Set by user.
1916 * - decoding: unused
1921 * amount of previous MV predictors (2a+1 x 2a+1 square)
1922 * - encoding: Set by user.
1923 * - decoding: unused
1925 int last_predictor_count;
1928 * prepass for motion estimation
1929 * - encoding: Set by user.
1930 * - decoding: unused
1935 * motion estimation prepass comparison function
1936 * - encoding: Set by user.
1937 * - decoding: unused
1942 * ME prepass diamond size & shape
1943 * - encoding: Set by user.
1944 * - decoding: unused
1950 * - encoding: Set by user.
1951 * - decoding: unused
1953 int me_subpel_quality;
1956 * callback to negotiate the pixelFormat
1957 * @param fmt is the list of formats which are supported by the codec,
1958 * it is terminated by -1 as 0 is a valid format, the formats are ordered by quality.
1959 * The first is always the native one.
1960 * @return the chosen format
1961 * - encoding: unused
1962 * - decoding: Set by user, if not set the native format will be chosen.
1964 enum PixelFormat (*get_format)(struct AVCodecContext *s, const enum PixelFormat * fmt);
1967 * DTG active format information (additional aspect ratio
1968 * information only used in DVB MPEG-2 transport streams)
1971 * - encoding: unused
1972 * - decoding: Set by decoder.
1974 int dtg_active_format;
1975 #define FF_DTG_AFD_SAME 8
1976 #define FF_DTG_AFD_4_3 9
1977 #define FF_DTG_AFD_16_9 10
1978 #define FF_DTG_AFD_14_9 11
1979 #define FF_DTG_AFD_4_3_SP_14_9 13
1980 #define FF_DTG_AFD_16_9_SP_14_9 14
1981 #define FF_DTG_AFD_SP_4_3 15
1984 * maximum motion estimation search range in subpel units
1985 * If 0 then no limit.
1987 * - encoding: Set by user.
1988 * - decoding: unused
1993 * intra quantizer bias
1994 * - encoding: Set by user.
1995 * - decoding: unused
1997 int intra_quant_bias;
1998 #define FF_DEFAULT_QUANT_BIAS 999999
2001 * inter quantizer bias
2002 * - encoding: Set by user.
2003 * - decoding: unused
2005 int inter_quant_bias;
2009 * - encoding: unused
2010 * - decoding: Which clrtable should be used for 8bit RGB images.
2011 * Tables have to be stored somewhere. FIXME
2016 * Global quality for codecs which cannot change it per frame.
2017 * This should be proportional to MPEG-1/2/4 qscale.
2018 * - encoding: Set by user.
2019 * - decoding: unused
2023 #define FF_CODER_TYPE_VLC 0
2024 #define FF_CODER_TYPE_AC 1
2025 #define FF_CODER_TYPE_RAW 2
2026 #define FF_CODER_TYPE_RLE 3
2027 #define FF_CODER_TYPE_DEFLATE 4
2030 * - encoding: Set by user.
2031 * - decoding: unused
2037 * - encoding: Set by user.
2038 * - decoding: unused
2044 * - encoding: unused
2045 * - decoding: Set by user.
2048 #define SLICE_FLAG_CODED_ORDER 0x0001 ///< draw_horiz_band() is called in coded order instead of display
2049 #define SLICE_FLAG_ALLOW_FIELD 0x0002 ///< allow draw_horiz_band() with field slices (MPEG2 field pics)
2050 #define SLICE_FLAG_ALLOW_PLANE 0x0004 ///< allow draw_horiz_band() with 1 component at a time (SVQ1)
2053 * XVideo Motion Acceleration
2054 * - encoding: forbidden
2055 * - decoding: set by decoder
2057 int xvmc_acceleration;
2060 * macroblock decision mode
2061 * - encoding: Set by user.
2062 * - decoding: unused
2065 #define FF_MB_DECISION_SIMPLE 0 ///< uses mb_cmp
2066 #define FF_MB_DECISION_BITS 1 ///< chooses the one which needs the fewest bits
2067 #define FF_MB_DECISION_RD 2 ///< rate distortion
2070 * custom intra quantization matrix
2071 * - encoding: Set by user, can be NULL.
2072 * - decoding: Set by libavcodec.
2074 uint16_t *intra_matrix;
2077 * custom inter quantization matrix
2078 * - encoding: Set by user, can be NULL.
2079 * - decoding: Set by libavcodec.
2081 uint16_t *inter_matrix;
2084 * fourcc from the AVI stream header (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A').
2085 * This is used to work around some encoder bugs.
2086 * - encoding: unused
2087 * - decoding: Set by user, will be converted to uppercase by libavcodec during init.
2089 unsigned int stream_codec_tag;
2092 * scene change detection threshold
2093 * 0 is default, larger means fewer detected scene changes.
2094 * - encoding: Set by user.
2095 * - decoding: unused
2097 int scenechange_threshold;
2100 * minimum Lagrange multipler
2101 * - encoding: Set by user.
2102 * - decoding: unused
2107 * maximum Lagrange multipler
2108 * - encoding: Set by user.
2109 * - decoding: unused
2114 * noise reduction strength
2115 * - encoding: Set by user.
2116 * - decoding: unused
2118 int noise_reduction;
2121 * Called at the beginning of a frame to get cr buffer for it.
2122 * Buffer type (size, hints) must be the same. libavcodec won't check it.
2123 * libavcodec will pass previous buffer in pic, function should return
2124 * same buffer or new buffer with old frame "painted" into it.
2125 * If pic.data[0] == NULL must behave like get_buffer().
2126 * if CODEC_CAP_DR1 is not set then reget_buffer() must call
2127 * avcodec_default_reget_buffer() instead of providing buffers allocated by
2129 * - encoding: unused
2130 * - decoding: Set by libavcodec, user can override.
2132 int (*reget_buffer)(struct AVCodecContext *c, AVFrame *pic);
2135 * Number of bits which should be loaded into the rc buffer before decoding starts.
2136 * - encoding: Set by user.
2137 * - decoding: unused
2139 int rc_initial_buffer_occupancy;
2143 * - encoding: Set by user.
2144 * - decoding: unused
2146 int inter_threshold;
2150 * - encoding: Set by user.
2151 * - decoding: Set by user.
2156 * Simulates errors in the bitstream to test error concealment.
2157 * - encoding: Set by user.
2158 * - decoding: unused
2163 * quantizer noise shaping
2164 * - encoding: Set by user.
2165 * - decoding: unused
2167 int quantizer_noise_shaping;
2171 * is used to decide how many independent tasks should be passed to execute()
2172 * - encoding: Set by user.
2173 * - decoding: Set by user.
2178 * The codec may call this to execute several independent things.
2179 * It will return only after finishing all tasks.
2180 * The user may replace this with some multithreaded implementation,
2181 * the default implementation will execute the parts serially.
2182 * @param count the number of things to execute
2183 * - encoding: Set by libavcodec, user can override.
2184 * - decoding: Set by libavcodec, user can override.
2186 int (*execute)(struct AVCodecContext *c, int (*func)(struct AVCodecContext *c2, void *arg), void *arg2, int *ret, int count, int size);
2190 * Can be used by execute() to store some per AVCodecContext stuff.
2191 * - encoding: set by execute()
2192 * - decoding: set by execute()
2194 void *thread_opaque;
2197 * Motion estimation threshold below which no motion estimation is
2198 * performed, but instead the user specified motion vectors are used.
2200 * - encoding: Set by user.
2201 * - decoding: unused
2206 * Macroblock threshold below which the user specified macroblock types will be used.
2207 * - encoding: Set by user.
2208 * - decoding: unused
2213 * precision of the intra DC coefficient - 8
2214 * - encoding: Set by user.
2215 * - decoding: unused
2217 int intra_dc_precision;
2220 * noise vs. sse weight for the nsse comparsion function
2221 * - encoding: Set by user.
2222 * - decoding: unused
2227 * Number of macroblock rows at the top which are skipped.
2228 * - encoding: unused
2229 * - decoding: Set by user.
2234 * Number of macroblock rows at the bottom which are skipped.
2235 * - encoding: unused
2236 * - decoding: Set by user.
2242 * - encoding: Set by user.
2243 * - decoding: Set by libavcodec.
2246 #define FF_PROFILE_UNKNOWN -99
2247 #define FF_PROFILE_RESERVED -100
2249 #define FF_PROFILE_AAC_MAIN 0
2250 #define FF_PROFILE_AAC_LOW 1
2251 #define FF_PROFILE_AAC_SSR 2
2252 #define FF_PROFILE_AAC_LTP 3
2254 #define FF_PROFILE_DTS 20
2255 #define FF_PROFILE_DTS_ES 30
2256 #define FF_PROFILE_DTS_96_24 40
2257 #define FF_PROFILE_DTS_HD_HRA 50
2258 #define FF_PROFILE_DTS_HD_MA 60
2260 #define FF_PROFILE_MPEG2_422 0
2261 #define FF_PROFILE_MPEG2_HIGH 1
2262 #define FF_PROFILE_MPEG2_SS 2
2263 #define FF_PROFILE_MPEG2_SNR_SCALABLE 3
2264 #define FF_PROFILE_MPEG2_MAIN 4
2265 #define FF_PROFILE_MPEG2_SIMPLE 5
2267 #define FF_PROFILE_H264_CONSTRAINED (1<<9) // 8+1; constraint_set1_flag
2268 #define FF_PROFILE_H264_INTRA (1<<11) // 8+3; constraint_set3_flag
2270 #define FF_PROFILE_H264_BASELINE 66
2271 #define FF_PROFILE_H264_CONSTRAINED_BASELINE (66|FF_PROFILE_H264_CONSTRAINED)
2272 #define FF_PROFILE_H264_MAIN 77
2273 #define FF_PROFILE_H264_EXTENDED 88
2274 #define FF_PROFILE_H264_HIGH 100
2275 #define FF_PROFILE_H264_HIGH_10 110
2276 #define FF_PROFILE_H264_HIGH_10_INTRA (110|FF_PROFILE_H264_INTRA)
2277 #define FF_PROFILE_H264_HIGH_422 122
2278 #define FF_PROFILE_H264_HIGH_422_INTRA (122|FF_PROFILE_H264_INTRA)
2279 #define FF_PROFILE_H264_HIGH_444 144
2280 #define FF_PROFILE_H264_HIGH_444_PREDICTIVE 244
2281 #define FF_PROFILE_H264_HIGH_444_INTRA (244|FF_PROFILE_H264_INTRA)
2282 #define FF_PROFILE_H264_CAVLC_444 44
2284 #define FF_PROFILE_VC1_SIMPLE 0
2285 #define FF_PROFILE_VC1_MAIN 1
2286 #define FF_PROFILE_VC1_COMPLEX 2
2287 #define FF_PROFILE_VC1_ADVANCED 3
2289 #define FF_PROFILE_MPEG4_SIMPLE 0
2290 #define FF_PROFILE_MPEG4_SIMPLE_SCALABLE 1
2291 #define FF_PROFILE_MPEG4_CORE 2
2292 #define FF_PROFILE_MPEG4_MAIN 3
2293 #define FF_PROFILE_MPEG4_N_BIT 4
2294 #define FF_PROFILE_MPEG4_SCALABLE_TEXTURE 5
2295 #define FF_PROFILE_MPEG4_SIMPLE_FACE_ANIMATION 6
2296 #define FF_PROFILE_MPEG4_BASIC_ANIMATED_TEXTURE 7
2297 #define FF_PROFILE_MPEG4_HYBRID 8
2298 #define FF_PROFILE_MPEG4_ADVANCED_REAL_TIME 9
2299 #define FF_PROFILE_MPEG4_CORE_SCALABLE 10
2300 #define FF_PROFILE_MPEG4_ADVANCED_CODING 11
2301 #define FF_PROFILE_MPEG4_ADVANCED_CORE 12
2302 #define FF_PROFILE_MPEG4_ADVANCED_SCALABLE_TEXTURE 13
2303 #define FF_PROFILE_MPEG4_SIMPLE_STUDIO 14
2304 #define FF_PROFILE_MPEG4_ADVANCED_SIMPLE 15
2308 * - encoding: Set by user.
2309 * - decoding: Set by libavcodec.
2312 #define FF_LEVEL_UNKNOWN -99
2315 * low resolution decoding, 1-> 1/2 size, 2->1/4 size
2316 * - encoding: unused
2317 * - decoding: Set by user.
2322 * Bitstream width / height, may be different from width/height if lowres enabled.
2323 * - encoding: unused
2324 * - decoding: Set by user before init if known. Codec should override / dynamically change if needed.
2326 int coded_width, coded_height;
2329 * frame skip threshold
2330 * - encoding: Set by user.
2331 * - decoding: unused
2333 int frame_skip_threshold;
2337 * - encoding: Set by user.
2338 * - decoding: unused
2340 int frame_skip_factor;
2343 * frame skip exponent
2344 * - encoding: Set by user.
2345 * - decoding: unused
2350 * frame skip comparison function
2351 * - encoding: Set by user.
2352 * - decoding: unused
2357 * Border processing masking, raises the quantizer for mbs on the borders
2359 * - encoding: Set by user.
2360 * - decoding: unused
2362 float border_masking;
2365 * minimum MB lagrange multipler
2366 * - encoding: Set by user.
2367 * - decoding: unused
2372 * maximum MB lagrange multipler
2373 * - encoding: Set by user.
2374 * - decoding: unused
2380 * - encoding: Set by user.
2381 * - decoding: unused
2383 int me_penalty_compensation;
2387 * - encoding: unused
2388 * - decoding: Set by user.
2390 enum AVDiscard skip_loop_filter;
2394 * - encoding: unused
2395 * - decoding: Set by user.
2397 enum AVDiscard skip_idct;
2401 * - encoding: unused
2402 * - decoding: Set by user.
2404 enum AVDiscard skip_frame;
2408 * - encoding: Set by user.
2409 * - decoding: unused
2415 * - encoding: Set by user.
2416 * - decoding: unused
2422 * - encoding: Set by user.
2423 * - decoding: unused
2428 * number of reference frames
2429 * - encoding: Set by user.
2430 * - decoding: Set by lavc.
2435 * chroma qp offset from luma
2436 * - encoding: Set by user.
2437 * - decoding: unused
2442 * trellis RD quantization
2443 * - encoding: Set by user.
2444 * - decoding: unused
2449 * Audio cutoff bandwidth (0 means "automatic")
2450 * - encoding: Set by user.
2451 * - decoding: unused
2456 * Multiplied by qscale for each frame and added to scene_change_score.
2457 * - encoding: Set by user.
2458 * - decoding: unused
2460 int scenechange_factor;
2464 * Note: Value depends upon the compare function used for fullpel ME.
2465 * - encoding: Set by user.
2466 * - decoding: unused
2471 * Adjust sensitivity of b_frame_strategy 1.
2472 * - encoding: Set by user.
2473 * - decoding: unused
2478 * - encoding: Set by user.
2479 * - decoding: unused
2481 int compression_level;
2482 #define FF_COMPRESSION_DEFAULT -1
2485 * - encoding: Set by user.
2486 * - decoding: unused
2488 int min_prediction_order;
2491 * - encoding: Set by user.
2492 * - decoding: unused
2494 int max_prediction_order;
2497 * GOP timecode frame start number, in non drop frame format
2498 * - encoding: Set by user.
2499 * - decoding: unused
2501 int64_t timecode_frame_start;
2503 #if FF_API_REQUEST_CHANNELS
2505 * Decoder should decode to this many channels if it can (0 for default)
2506 * - encoding: unused
2507 * - decoding: Set by user.
2508 * @deprecated Deprecated in favor of request_channel_layout.
2510 int request_channels;
2514 * opaque 64bit number (generally a PTS) that will be reordered and
2515 * output in AVFrame.reordered_opaque
2516 * @deprecated in favor of pkt_pts
2517 * - encoding: unused
2518 * - decoding: Set by user.
2520 int64_t reordered_opaque;
2523 * Bits per sample/pixel of internal libavcodec pixel/sample format.
2524 * - encoding: set by user.
2525 * - decoding: set by libavcodec.
2527 int bits_per_raw_sample;
2530 * Audio channel layout.
2531 * - encoding: set by user.
2532 * - decoding: set by libavcodec.
2534 uint64_t channel_layout;
2537 * Request decoder to use this channel layout if it can (0 for default)
2538 * - encoding: unused
2539 * - decoding: Set by user.
2541 uint64_t request_channel_layout;
2544 * Ratecontrol attempt to use, at maximum, <value> of what can be used without an underflow.
2545 * - encoding: Set by user.
2546 * - decoding: unused.
2548 float rc_max_available_vbv_use;
2551 * Ratecontrol attempt to use, at least, <value> times the amount needed to prevent a vbv overflow.
2552 * - encoding: Set by user.
2553 * - decoding: unused.
2555 float rc_min_vbv_overflow_use;
2558 * Hardware accelerator in use
2559 * - encoding: unused.
2560 * - decoding: Set by libavcodec
2562 struct AVHWAccel *hwaccel;
2565 * For some codecs, the time base is closer to the field rate than the frame rate.
2566 * Most notably, H.264 and MPEG-2 specify time_base as half of frame duration
2567 * if no telecine is used ...
2569 * Set to time_base ticks per frame. Default 1, e.g., H.264/MPEG-2 set it to 2.
2571 int ticks_per_frame;
2574 * Hardware accelerator context.
2575 * For some hardware accelerators, a global context needs to be
2576 * provided by the user. In that case, this holds display-dependent
2577 * data Libav cannot instantiate itself. Please refer to the
2578 * Libav HW accelerator documentation to know how to fill this
2579 * is. e.g. for VA API, this is a struct vaapi_context.
2580 * - encoding: unused
2581 * - decoding: Set by user
2583 void *hwaccel_context;
2586 * Chromaticity coordinates of the source primaries.
2587 * - encoding: Set by user
2588 * - decoding: Set by libavcodec
2590 enum AVColorPrimaries color_primaries;
2593 * Color Transfer Characteristic.
2594 * - encoding: Set by user
2595 * - decoding: Set by libavcodec
2597 enum AVColorTransferCharacteristic color_trc;
2600 * YUV colorspace type.
2601 * - encoding: Set by user
2602 * - decoding: Set by libavcodec
2604 enum AVColorSpace colorspace;
2607 * MPEG vs JPEG YUV range.
2608 * - encoding: Set by user
2609 * - decoding: Set by libavcodec
2611 enum AVColorRange color_range;
2614 * This defines the location of chroma samples.
2615 * - encoding: Set by user
2616 * - decoding: Set by libavcodec
2618 enum AVChromaLocation chroma_sample_location;
2621 * The codec may call this to execute several independent things.
2622 * It will return only after finishing all tasks.
2623 * The user may replace this with some multithreaded implementation,
2624 * the default implementation will execute the parts serially.
2625 * Also see avcodec_thread_init and e.g. the --enable-pthread configure option.
2626 * @param c context passed also to func
2627 * @param count the number of things to execute
2628 * @param arg2 argument passed unchanged to func
2629 * @param ret return values of executed functions, must have space for "count" values. May be NULL.
2630 * @param func function that will be called count times, with jobnr from 0 to count-1.
2631 * threadnr will be in the range 0 to c->thread_count-1 < MAX_THREADS and so that no
2632 * two instances of func executing at the same time will have the same threadnr.
2633 * @return always 0 currently, but code should handle a future improvement where when any call to func
2634 * returns < 0 no further calls to func may be done and < 0 is returned.
2635 * - encoding: Set by libavcodec, user can override.
2636 * - decoding: Set by libavcodec, user can override.
2638 int (*execute2)(struct AVCodecContext *c, int (*func)(struct AVCodecContext *c2, void *arg, int jobnr, int threadnr), void *arg2, int *ret, int count);
2640 int log_level_offset;
2644 * Indicates number of picture subdivisions. Used for parallelized
2646 * - encoding: Set by user
2647 * - decoding: unused
2652 * Header containing style information for text subtitles.
2653 * For SUBTITLE_ASS subtitle type, it should contain the whole ASS
2654 * [Script Info] and [V4+ Styles] section, plus the [Events] line and
2655 * the Format line following. It shouldn't include any Dialogue line.
2656 * - encoding: Set/allocated/freed by user (before avcodec_open2())
2657 * - decoding: Set/allocated/freed by libavcodec (by avcodec_open2())
2659 uint8_t *subtitle_header;
2660 int subtitle_header_size;
2663 * Current packet as passed into the decoder, to avoid having
2664 * to pass the packet into every function. Currently only valid
2665 * inside lavc and get/release_buffer callbacks.
2666 * - decoding: set by avcodec_decode_*, read by get_buffer() for setting pkt_pts
2667 * - encoding: unused
2672 * Which multithreading methods to use.
2673 * Use of FF_THREAD_FRAME will increase decoding delay by one frame per thread,
2674 * so clients which cannot provide future frames should not use it.
2676 * - encoding: Set by user, otherwise the default is used.
2677 * - decoding: Set by user, otherwise the default is used.
2680 #define FF_THREAD_FRAME 1 ///< Decode more than one frame at once
2681 #define FF_THREAD_SLICE 2 ///< Decode more than one part of a single frame at once
2684 * Which multithreading methods are in use by the codec.
2685 * - encoding: Set by libavcodec.
2686 * - decoding: Set by libavcodec.
2688 int active_thread_type;
2691 * Set by the client if its custom get_buffer() callback can be called
2692 * from another thread, which allows faster multithreaded decoding.
2693 * draw_horiz_band() will be called from other threads regardless of this setting.
2694 * Ignored if the default get_buffer() is used.
2695 * - encoding: Set by user.
2696 * - decoding: Set by user.
2698 int thread_safe_callbacks;
2701 * VBV delay coded in the last frame (in periods of a 27 MHz clock).
2702 * Used for compliant TS muxing.
2703 * - encoding: Set by libavcodec.
2704 * - decoding: unused.
2709 * Type of service that the audio stream conveys.
2710 * - encoding: Set by user.
2711 * - decoding: Set by libavcodec.
2713 enum AVAudioServiceType audio_service_type;
2716 * Used to request a sample format from the decoder.
2717 * - encoding: unused.
2718 * - decoding: Set by user.
2720 enum AVSampleFormat request_sample_fmt;
2723 * Error recognition; may misdetect some more or less valid parts as errors.
2724 * - encoding: unused
2725 * - decoding: Set by user.
2727 int err_recognition;
2728 #define AV_EF_CRCCHECK (1<<0)
2729 #define AV_EF_BITSTREAM (1<<1)
2730 #define AV_EF_BUFFER (1<<2)
2731 #define AV_EF_EXPLODE (1<<3)
2734 * Private context used for internal data.
2736 * Unlike priv_data, this is not codec-specific. It is used in general
2737 * libavcodec functions.
2739 struct AVCodecInternal *internal;
2742 * - encoding: set by libavcodec
2743 * - decoding: Set by libavcodec
2745 enum AVFieldOrder field_order;
2751 typedef struct AVProfile {
2753 const char *name; ///< short name for the profile
2756 typedef struct AVCodecDefault AVCodecDefault;
2761 typedef struct AVCodec {
2763 * Name of the codec implementation.
2764 * The name is globally unique among encoders and among decoders (but an
2765 * encoder and a decoder can share the same name).
2766 * This is the primary way to find a codec from the user perspective.
2770 * Descriptive name for the codec, meant to be more human readable than name.
2771 * You should use the NULL_IF_CONFIG_SMALL() macro to define it.
2773 const char *long_name;
2774 enum AVMediaType type;
2777 * Codec capabilities.
2781 const AVRational *supported_framerates; ///< array of supported framerates, or NULL if any, array is terminated by {0,0}
2782 const enum PixelFormat *pix_fmts; ///< array of supported pixel formats, or NULL if unknown, array is terminated by -1
2783 const int *supported_samplerates; ///< array of supported audio samplerates, or NULL if unknown, array is terminated by 0
2784 const enum AVSampleFormat *sample_fmts; ///< array of supported sample formats, or NULL if unknown, array is terminated by -1
2785 const uint64_t *channel_layouts; ///< array of support channel layouts, or NULL if unknown. array is terminated by 0
2786 uint8_t max_lowres; ///< maximum value for lowres supported by the decoder
2787 const AVClass *priv_class; ///< AVClass for the private context
2788 const AVProfile *profiles; ///< array of recognized profiles, or NULL if unknown, array is terminated by {FF_PROFILE_UNKNOWN}
2790 /*****************************************************************
2791 * No fields below this line are part of the public API. They
2792 * may not be used outside of libavcodec and can be changed and
2794 * New public fields should be added right above.
2795 *****************************************************************
2798 struct AVCodec *next;
2800 * @name Frame-level threading support functions
2804 * If defined, called on thread contexts when they are created.
2805 * If the codec allocates writable tables in init(), re-allocate them here.
2806 * priv_data will be set to a copy of the original.
2808 int (*init_thread_copy)(AVCodecContext *);
2810 * Copy necessary context variables from a previous thread context to the current one.
2811 * If not defined, the next thread will start automatically; otherwise, the codec
2812 * must call ff_thread_finish_setup().
2814 * dst and src will (rarely) point to the same context, in which case memcpy should be skipped.
2816 int (*update_thread_context)(AVCodecContext *dst, const AVCodecContext *src);
2820 * Private codec-specific defaults.
2822 const AVCodecDefault *defaults;
2825 * Initialize codec static data, called from avcodec_register().
2827 void (*init_static_data)(struct AVCodec *codec);
2829 int (*init)(AVCodecContext *);
2830 int (*encode)(AVCodecContext *, uint8_t *buf, int buf_size, void *data);
2832 * Encode data to an AVPacket.
2834 * @param avctx codec context
2835 * @param avpkt output AVPacket (may contain a user-provided buffer)
2836 * @param[in] frame AVFrame containing the raw data to be encoded
2837 * @param[out] got_packet_ptr encoder sets to 0 or 1 to indicate that a
2838 * non-empty packet was returned in avpkt.
2839 * @return 0 on success, negative error code on failure
2841 int (*encode2)(AVCodecContext *avctx, AVPacket *avpkt, const AVFrame *frame,
2842 int *got_packet_ptr);
2843 int (*decode)(AVCodecContext *, void *outdata, int *outdata_size, AVPacket *avpkt);
2844 int (*close)(AVCodecContext *);
2847 * Will be called when seeking
2849 void (*flush)(AVCodecContext *);
2855 typedef struct AVHWAccel {
2857 * Name of the hardware accelerated codec.
2858 * The name is globally unique among encoders and among decoders (but an
2859 * encoder and a decoder can share the same name).
2864 * Type of codec implemented by the hardware accelerator.
2866 * See AVMEDIA_TYPE_xxx
2868 enum AVMediaType type;
2871 * Codec implemented by the hardware accelerator.
2878 * Supported pixel format.
2880 * Only hardware accelerated formats are supported here.
2882 enum PixelFormat pix_fmt;
2885 * Hardware accelerated codec capabilities.
2886 * see FF_HWACCEL_CODEC_CAP_*
2890 struct AVHWAccel *next;
2893 * Called at the beginning of each frame or field picture.
2895 * Meaningful frame information (codec specific) is guaranteed to
2896 * be parsed at this point. This function is mandatory.
2898 * Note that buf can be NULL along with buf_size set to 0.
2899 * Otherwise, this means the whole frame is available at this point.
2901 * @param avctx the codec context
2902 * @param buf the frame data buffer base
2903 * @param buf_size the size of the frame in bytes
2904 * @return zero if successful, a negative value otherwise
2906 int (*start_frame)(AVCodecContext *avctx, const uint8_t *buf, uint32_t buf_size);
2909 * Callback for each slice.
2911 * Meaningful slice information (codec specific) is guaranteed to
2912 * be parsed at this point. This function is mandatory.
2914 * @param avctx the codec context
2915 * @param buf the slice data buffer base
2916 * @param buf_size the size of the slice in bytes
2917 * @return zero if successful, a negative value otherwise
2919 int (*decode_slice)(AVCodecContext *avctx, const uint8_t *buf, uint32_t buf_size);
2922 * Called at the end of each frame or field picture.
2924 * The whole picture is parsed at this point and can now be sent
2925 * to the hardware accelerator. This function is mandatory.
2927 * @param avctx the codec context
2928 * @return zero if successful, a negative value otherwise
2930 int (*end_frame)(AVCodecContext *avctx);
2933 * Size of HW accelerator private data.
2935 * Private data is allocated with av_mallocz() before
2936 * AVCodecContext.get_buffer() and deallocated after
2937 * AVCodecContext.release_buffer().
2943 * four components are given, that's all.
2944 * the last component is alpha
2946 typedef struct AVPicture {
2947 uint8_t *data[AV_NUM_DATA_POINTERS];
2948 int linesize[AV_NUM_DATA_POINTERS]; ///< number of bytes per line
2951 #define AVPALETTE_SIZE 1024
2952 #define AVPALETTE_COUNT 256
2954 enum AVSubtitleType {
2957 SUBTITLE_BITMAP, ///< A bitmap, pict will be set
2960 * Plain text, the text field must be set by the decoder and is
2961 * authoritative. ass and pict fields may contain approximations.
2966 * Formatted text, the ass field must be set by the decoder and is
2967 * authoritative. pict and text fields may contain approximations.
2972 typedef struct AVSubtitleRect {
2973 int x; ///< top left corner of pict, undefined when pict is not set
2974 int y; ///< top left corner of pict, undefined when pict is not set
2975 int w; ///< width of pict, undefined when pict is not set
2976 int h; ///< height of pict, undefined when pict is not set
2977 int nb_colors; ///< number of colors in pict, undefined when pict is not set
2980 * data+linesize for the bitmap of this subtitle.
2981 * can be set for text/ass as well once they where rendered
2984 enum AVSubtitleType type;
2986 char *text; ///< 0 terminated plain UTF-8 text
2989 * 0 terminated ASS/SSA compatible event line.
2990 * The pressentation of this is unaffected by the other values in this
2996 typedef struct AVSubtitle {
2997 uint16_t format; /* 0 = graphics */
2998 uint32_t start_display_time; /* relative to packet pts, in ms */
2999 uint32_t end_display_time; /* relative to packet pts, in ms */
3001 AVSubtitleRect **rects;
3002 int64_t pts; ///< Same as packet pts, in AV_TIME_BASE
3005 /* packet functions */
3008 * @deprecated use NULL instead
3010 attribute_deprecated void av_destruct_packet_nofree(AVPacket *pkt);
3013 * Default packet destructor.
3015 void av_destruct_packet(AVPacket *pkt);
3018 * Initialize optional fields of a packet with default values.
3022 void av_init_packet(AVPacket *pkt);
3025 * Allocate the payload of a packet and initialize its fields with
3029 * @param size wanted payload size
3030 * @return 0 if OK, AVERROR_xxx otherwise
3032 int av_new_packet(AVPacket *pkt, int size);
3035 * Reduce packet size, correctly zeroing padding
3038 * @param size new size
3040 void av_shrink_packet(AVPacket *pkt, int size);
3043 * Increase packet size, correctly zeroing padding
3046 * @param grow_by number of bytes by which to increase the size of the packet
3048 int av_grow_packet(AVPacket *pkt, int grow_by);
3051 * @warning This is a hack - the packet memory allocation stuff is broken. The
3052 * packet is allocated if it was not really allocated.
3054 int av_dup_packet(AVPacket *pkt);
3059 * @param pkt packet to free
3061 void av_free_packet(AVPacket *pkt);
3064 * Allocate new information of a packet.
3067 * @param type side information type
3068 * @param size side information size
3069 * @return pointer to fresh allocated data or NULL otherwise
3071 uint8_t* av_packet_new_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
3075 * Get side information from packet.
3078 * @param type desired side information type
3079 * @param size pointer for side information size to store (optional)
3080 * @return pointer to data if present or NULL otherwise
3082 uint8_t* av_packet_get_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
3087 struct ReSampleContext;
3088 struct AVResampleContext;
3090 typedef struct ReSampleContext ReSampleContext;
3093 * Initialize audio resampling context.
3095 * @param output_channels number of output channels
3096 * @param input_channels number of input channels
3097 * @param output_rate output sample rate
3098 * @param input_rate input sample rate
3099 * @param sample_fmt_out requested output sample format
3100 * @param sample_fmt_in input sample format
3101 * @param filter_length length of each FIR filter in the filterbank relative to the cutoff frequency
3102 * @param log2_phase_count log2 of the number of entries in the polyphase filterbank
3103 * @param linear if 1 then the used FIR filter will be linearly interpolated
3104 between the 2 closest, if 0 the closest will be used
3105 * @param cutoff cutoff frequency, 1.0 corresponds to half the output sampling rate
3106 * @return allocated ReSampleContext, NULL if error occurred
3108 ReSampleContext *av_audio_resample_init(int output_channels, int input_channels,
3109 int output_rate, int input_rate,
3110 enum AVSampleFormat sample_fmt_out,
3111 enum AVSampleFormat sample_fmt_in,
3112 int filter_length, int log2_phase_count,
3113 int linear, double cutoff);
3115 int audio_resample(ReSampleContext *s, short *output, short *input, int nb_samples);
3118 * Free resample context.
3120 * @param s a non-NULL pointer to a resample context previously
3121 * created with av_audio_resample_init()
3123 void audio_resample_close(ReSampleContext *s);
3127 * Initialize an audio resampler.
3128 * Note, if either rate is not an integer then simply scale both rates up so they are.
3129 * @param filter_length length of each FIR filter in the filterbank relative to the cutoff freq
3130 * @param log2_phase_count log2 of the number of entries in the polyphase filterbank
3131 * @param linear If 1 then the used FIR filter will be linearly interpolated
3132 between the 2 closest, if 0 the closest will be used
3133 * @param cutoff cutoff frequency, 1.0 corresponds to half the output sampling rate
3135 struct AVResampleContext *av_resample_init(int out_rate, int in_rate, int filter_length, int log2_phase_count, int linear, double cutoff);
3138 * Resample an array of samples using a previously configured context.
3139 * @param src an array of unconsumed samples
3140 * @param consumed the number of samples of src which have been consumed are returned here
3141 * @param src_size the number of unconsumed samples available
3142 * @param dst_size the amount of space in samples available in dst
3143 * @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.
3144 * @return the number of samples written in dst or -1 if an error occurred
3146 int av_resample(struct AVResampleContext *c, short *dst, short *src, int *consumed, int src_size, int dst_size, int update_ctx);
3150 * Compensate samplerate/timestamp drift. The compensation is done by changing
3151 * the resampler parameters, so no audible clicks or similar distortions occur
3152 * @param compensation_distance distance in output samples over which the compensation should be performed
3153 * @param sample_delta number of output samples which should be output less
3155 * example: av_resample_compensate(c, 10, 500)
3156 * here instead of 510 samples only 500 samples would be output
3158 * note, due to rounding the actual compensation might be slightly different,
3159 * especially if the compensation_distance is large and the in_rate used during init is small
3161 void av_resample_compensate(struct AVResampleContext *c, int sample_delta, int compensation_distance);
3162 void av_resample_close(struct AVResampleContext *c);
3165 * Allocate memory for a picture. Call avpicture_free() to free it.
3167 * @see avpicture_fill()
3169 * @param picture the picture to be filled in
3170 * @param pix_fmt the format of the picture
3171 * @param width the width of the picture
3172 * @param height the height of the picture
3173 * @return zero if successful, a negative value if not
3175 int avpicture_alloc(AVPicture *picture, enum PixelFormat pix_fmt, int width, int height);
3178 * Free a picture previously allocated by avpicture_alloc().
3179 * The data buffer used by the AVPicture is freed, but the AVPicture structure
3182 * @param picture the AVPicture to be freed
3184 void avpicture_free(AVPicture *picture);
3187 * Fill in the AVPicture fields.
3188 * The fields of the given AVPicture are filled in by using the 'ptr' address
3189 * which points to the image data buffer. Depending on the specified picture
3190 * format, one or multiple image data pointers and line sizes will be set.
3191 * If a planar format is specified, several pointers will be set pointing to
3192 * the different picture planes and the line sizes of the different planes
3193 * will be stored in the lines_sizes array.
3194 * Call with ptr == NULL to get the required size for the ptr buffer.
3196 * To allocate the buffer and fill in the AVPicture fields in one call,
3197 * use avpicture_alloc().
3199 * @param picture AVPicture whose fields are to be filled in
3200 * @param ptr Buffer which will contain or contains the actual image data
3201 * @param pix_fmt The format in which the picture data is stored.
3202 * @param width the width of the image in pixels
3203 * @param height the height of the image in pixels
3204 * @return size of the image data in bytes
3206 int avpicture_fill(AVPicture *picture, uint8_t *ptr,
3207 enum PixelFormat pix_fmt, int width, int height);
3210 * Copy pixel data from an AVPicture into a buffer.
3211 * The data is stored compactly, without any gaps for alignment or padding
3212 * which may be applied by avpicture_fill().
3214 * @see avpicture_get_size()
3216 * @param[in] src AVPicture containing image data
3217 * @param[in] pix_fmt The format in which the picture data is stored.
3218 * @param[in] width the width of the image in pixels.
3219 * @param[in] height the height of the image in pixels.
3220 * @param[out] dest A buffer into which picture data will be copied.
3221 * @param[in] dest_size The size of 'dest'.
3222 * @return The number of bytes written to dest, or a negative value (error code) on error.
3224 int avpicture_layout(const AVPicture* src, enum PixelFormat pix_fmt, int width, int height,
3225 unsigned char *dest, int dest_size);
3228 * Calculate the size in bytes that a picture of the given width and height
3229 * would occupy if stored in the given picture format.
3230 * Note that this returns the size of a compact representation as generated
3231 * by avpicture_layout(), which can be smaller than the size required for e.g.
3234 * @param pix_fmt the given picture format
3235 * @param width the width of the image
3236 * @param height the height of the image
3237 * @return Image data size in bytes or -1 on error (e.g. too large dimensions).
3239 int avpicture_get_size(enum PixelFormat pix_fmt, int width, int height);
3240 void avcodec_get_chroma_sub_sample(enum PixelFormat pix_fmt, int *h_shift, int *v_shift);
3242 void avcodec_set_dimensions(AVCodecContext *s, int width, int height);
3245 * Return a value representing the fourCC code associated to the
3246 * pixel format pix_fmt, or 0 if no associated fourCC code can be
3249 unsigned int avcodec_pix_fmt_to_codec_tag(enum PixelFormat pix_fmt);
3252 * Put a string representing the codec tag codec_tag in buf.
3254 * @param buf_size size in bytes of buf
3255 * @return the length of the string that would have been generated if
3256 * enough space had been available, excluding the trailing null
3258 size_t av_get_codec_tag_string(char *buf, size_t buf_size, unsigned int codec_tag);
3260 #define FF_LOSS_RESOLUTION 0x0001 /**< loss due to resolution change */
3261 #define FF_LOSS_DEPTH 0x0002 /**< loss due to color depth change */
3262 #define FF_LOSS_COLORSPACE 0x0004 /**< loss due to color space conversion */
3263 #define FF_LOSS_ALPHA 0x0008 /**< loss of alpha bits */
3264 #define FF_LOSS_COLORQUANT 0x0010 /**< loss due to color quantization */
3265 #define FF_LOSS_CHROMA 0x0020 /**< loss of chroma (e.g. RGB to gray conversion) */
3268 * Compute what kind of losses will occur when converting from one specific
3269 * pixel format to another.
3270 * When converting from one pixel format to another, information loss may occur.
3271 * For example, when converting from RGB24 to GRAY, the color information will
3272 * be lost. Similarly, other losses occur when converting from some formats to
3273 * other formats. These losses can involve loss of chroma, but also loss of
3274 * resolution, loss of color depth, loss due to the color space conversion, loss
3275 * of the alpha bits or loss due to color quantization.
3276 * avcodec_get_fix_fmt_loss() informs you about the various types of losses
3277 * which will occur when converting from one pixel format to another.
3279 * @param[in] dst_pix_fmt destination pixel format
3280 * @param[in] src_pix_fmt source pixel format
3281 * @param[in] has_alpha Whether the source pixel format alpha channel is used.
3282 * @return Combination of flags informing you what kind of losses will occur.
3284 int avcodec_get_pix_fmt_loss(enum PixelFormat dst_pix_fmt, enum PixelFormat src_pix_fmt,
3288 * Find the best pixel format to convert to given a certain source pixel
3289 * format. When converting from one pixel format to another, information loss
3290 * may occur. For example, when converting from RGB24 to GRAY, the color
3291 * information will be lost. Similarly, other losses occur when converting from
3292 * some formats to other formats. avcodec_find_best_pix_fmt() searches which of
3293 * the given pixel formats should be used to suffer the least amount of loss.
3294 * The pixel formats from which it chooses one, are determined by the
3295 * pix_fmt_mask parameter.
3298 * src_pix_fmt = PIX_FMT_YUV420P;
3299 * pix_fmt_mask = (1 << PIX_FMT_YUV422P) || (1 << PIX_FMT_RGB24);
3300 * dst_pix_fmt = avcodec_find_best_pix_fmt(pix_fmt_mask, src_pix_fmt, alpha, &loss);
3303 * @param[in] pix_fmt_mask bitmask determining which pixel format to choose from
3304 * @param[in] src_pix_fmt source pixel format
3305 * @param[in] has_alpha Whether the source pixel format alpha channel is used.
3306 * @param[out] loss_ptr Combination of flags informing you what kind of losses will occur.
3307 * @return The best pixel format to convert to or -1 if none was found.
3309 enum PixelFormat avcodec_find_best_pix_fmt(int64_t pix_fmt_mask, enum PixelFormat src_pix_fmt,
3310 int has_alpha, int *loss_ptr);
3312 /* deinterlace a picture */
3313 /* deinterlace - if not supported return -1 */
3314 int avpicture_deinterlace(AVPicture *dst, const AVPicture *src,
3315 enum PixelFormat pix_fmt, int width, int height);
3317 /* external high level API */
3320 * If c is NULL, returns the first registered codec,
3321 * if c is non-NULL, returns the next registered codec after c,
3322 * or NULL if c is the last one.
3324 AVCodec *av_codec_next(AVCodec *c);
3327 * Return the LIBAVCODEC_VERSION_INT constant.
3329 unsigned avcodec_version(void);
3332 * Return the libavcodec build-time configuration.
3334 const char *avcodec_configuration(void);
3337 * Return the libavcodec license.
3339 const char *avcodec_license(void);
3342 * Register the codec codec and initialize libavcodec.
3344 * @warning either this function or avcodec_register_all() must be called
3345 * before any other libavcodec functions.
3347 * @see avcodec_register_all()
3349 void avcodec_register(AVCodec *codec);
3352 * Find a registered encoder with a matching codec ID.
3354 * @param id CodecID of the requested encoder
3355 * @return An encoder if one was found, NULL otherwise.
3357 AVCodec *avcodec_find_encoder(enum CodecID id);
3360 * Find a registered encoder with the specified name.
3362 * @param name name of the requested encoder
3363 * @return An encoder if one was found, NULL otherwise.
3365 AVCodec *avcodec_find_encoder_by_name(const char *name);
3368 * Find a registered decoder with a matching codec ID.
3370 * @param id CodecID of the requested decoder
3371 * @return A decoder if one was found, NULL otherwise.
3373 AVCodec *avcodec_find_decoder(enum CodecID id);
3376 * Find a registered decoder with the specified name.
3378 * @param name name of the requested decoder
3379 * @return A decoder if one was found, NULL otherwise.
3381 AVCodec *avcodec_find_decoder_by_name(const char *name);
3382 void avcodec_string(char *buf, int buf_size, AVCodecContext *enc, int encode);
3385 * Return a name for the specified profile, if available.
3387 * @param codec the codec that is searched for the given profile
3388 * @param profile the profile value for which a name is requested
3389 * @return A name for the profile if found, NULL otherwise.
3391 const char *av_get_profile_name(const AVCodec *codec, int profile);
3394 * Set the fields of the given AVCodecContext to default values corresponding
3395 * to the given codec (defaults may be codec-dependent).
3397 * Do not call this function if a non-NULL codec has been passed
3398 * to avcodec_alloc_context3() that allocated this AVCodecContext.
3399 * If codec is non-NULL, it is illegal to call avcodec_open2() with a
3400 * different codec on this AVCodecContext.
3402 int avcodec_get_context_defaults3(AVCodecContext *s, AVCodec *codec);
3405 * Allocate an AVCodecContext and set its fields to default values. The
3406 * resulting struct can be deallocated by calling avcodec_close() on it followed
3409 * @param codec if non-NULL, allocate private data and initialize defaults
3410 * for the given codec. It is illegal to then call avcodec_open2()
3411 * with a different codec.
3412 * If NULL, then the codec-specific defaults won't be initialized,
3413 * which may result in suboptimal default settings (this is
3414 * important mainly for encoders, e.g. libx264).
3416 * @return An AVCodecContext filled with default values or NULL on failure.
3417 * @see avcodec_get_context_defaults
3419 AVCodecContext *avcodec_alloc_context3(AVCodec *codec);
3422 * Copy the settings of the source AVCodecContext into the destination
3423 * AVCodecContext. The resulting destination codec context will be
3424 * unopened, i.e. you are required to call avcodec_open2() before you
3425 * can use this AVCodecContext to decode/encode video/audio data.
3427 * @param dest target codec context, should be initialized with
3428 * avcodec_alloc_context3(), but otherwise uninitialized
3429 * @param src source codec context
3430 * @return AVERROR() on error (e.g. memory allocation error), 0 on success
3432 int avcodec_copy_context(AVCodecContext *dest, const AVCodecContext *src);
3435 * Set the fields of the given AVFrame to default values.
3437 * @param pic The AVFrame of which the fields should be set to default values.
3439 void avcodec_get_frame_defaults(AVFrame *pic);
3442 * Allocate an AVFrame and set its fields to default values. The resulting
3443 * struct can be deallocated by simply calling av_free().
3445 * @return An AVFrame filled with default values or NULL on failure.
3446 * @see avcodec_get_frame_defaults
3448 AVFrame *avcodec_alloc_frame(void);
3450 int avcodec_default_get_buffer(AVCodecContext *s, AVFrame *pic);
3451 void avcodec_default_release_buffer(AVCodecContext *s, AVFrame *pic);
3452 int avcodec_default_reget_buffer(AVCodecContext *s, AVFrame *pic);
3455 * Return the amount of padding in pixels which the get_buffer callback must
3456 * provide around the edge of the image for codecs which do not have the
3457 * CODEC_FLAG_EMU_EDGE flag.
3459 * @return Required padding in pixels.
3461 unsigned avcodec_get_edge_width(void);
3463 * Modify width and height values so that they will result in a memory
3464 * buffer that is acceptable for the codec if you do not use any horizontal
3467 * May only be used if a codec with CODEC_CAP_DR1 has been opened.
3468 * If CODEC_FLAG_EMU_EDGE is not set, the dimensions must have been increased
3469 * according to avcodec_get_edge_width() before.
3471 void avcodec_align_dimensions(AVCodecContext *s, int *width, int *height);
3473 * Modify width and height values so that they will result in a memory
3474 * buffer that is acceptable for the codec if you also ensure that all
3475 * line sizes are a multiple of the respective linesize_align[i].
3477 * May only be used if a codec with CODEC_CAP_DR1 has been opened.
3478 * If CODEC_FLAG_EMU_EDGE is not set, the dimensions must have been increased
3479 * according to avcodec_get_edge_width() before.
3481 void avcodec_align_dimensions2(AVCodecContext *s, int *width, int *height,
3482 int linesize_align[AV_NUM_DATA_POINTERS]);
3484 enum PixelFormat avcodec_default_get_format(struct AVCodecContext *s, const enum PixelFormat * fmt);
3486 int avcodec_default_execute(AVCodecContext *c, int (*func)(AVCodecContext *c2, void *arg2),void *arg, int *ret, int count, int size);
3487 int avcodec_default_execute2(AVCodecContext *c, int (*func)(AVCodecContext *c2, void *arg2, int, int),void *arg, int *ret, int count);
3488 //FIXME func typedef
3491 * Initialize the AVCodecContext to use the given AVCodec. Prior to using this
3492 * function the context has to be allocated with avcodec_alloc_context3().
3494 * The functions avcodec_find_decoder_by_name(), avcodec_find_encoder_by_name(),
3495 * avcodec_find_decoder() and avcodec_find_encoder() provide an easy way for
3496 * retrieving a codec.
3498 * @warning This function is not thread safe!
3501 * avcodec_register_all();
3502 * av_dict_set(&opts, "b", "2.5M", 0);
3503 * codec = avcodec_find_decoder(CODEC_ID_H264);
3507 * context = avcodec_alloc_context3(codec);
3509 * if (avcodec_open2(context, codec, opts) < 0)
3513 * @param avctx The context to initialize.
3514 * @param codec The codec to open this context for. If a non-NULL codec has been
3515 * previously passed to avcodec_alloc_context3() or
3516 * avcodec_get_context_defaults3() for this context, then this
3517 * parameter MUST be either NULL or equal to the previously passed
3519 * @param options A dictionary filled with AVCodecContext and codec-private options.
3520 * On return this object will be filled with options that were not found.
3522 * @return zero on success, a negative value on error
3523 * @see avcodec_alloc_context3(), avcodec_find_decoder(), avcodec_find_encoder(),
3524 * av_dict_set(), av_opt_find().
3526 int avcodec_open2(AVCodecContext *avctx, AVCodec *codec, AVDictionary **options);
3528 #if FF_API_OLD_DECODE_AUDIO
3530 * Wrapper function which calls avcodec_decode_audio4.
3532 * @deprecated Use avcodec_decode_audio4 instead.
3534 * Decode the audio frame of size avpkt->size from avpkt->data into samples.
3535 * Some decoders may support multiple frames in a single AVPacket, such
3536 * decoders would then just decode the first frame. In this case,
3537 * avcodec_decode_audio3 has to be called again with an AVPacket that contains
3538 * the remaining data in order to decode the second frame etc.
3540 * could be outputted, frame_size_ptr is zero. Otherwise, it is the
3541 * decompressed frame size in bytes.
3543 * @warning You must set frame_size_ptr to the allocated size of the
3544 * output buffer before calling avcodec_decode_audio3().
3546 * @warning The input buffer must be FF_INPUT_BUFFER_PADDING_SIZE larger than
3547 * the actual read bytes because some optimized bitstream readers read 32 or 64
3548 * bits at once and could read over the end.
3550 * @warning The end of the input buffer avpkt->data should be set to 0 to ensure that
3551 * no overreading happens for damaged MPEG streams.
3553 * @warning You must not provide a custom get_buffer() when using
3554 * avcodec_decode_audio3(). Doing so will override it with
3555 * avcodec_default_get_buffer. Use avcodec_decode_audio4() instead,
3556 * which does allow the application to provide a custom get_buffer().
3558 * @note You might have to align the input buffer avpkt->data and output buffer
3559 * samples. The alignment requirements depend on the CPU: On some CPUs it isn't
3560 * necessary at all, on others it won't work at all if not aligned and on others
3561 * it will work but it will have an impact on performance.
3563 * In practice, avpkt->data should have 4 byte alignment at minimum and
3564 * samples should be 16 byte aligned unless the CPU doesn't need it
3565 * (AltiVec and SSE do).
3567 * @note Codecs which have the CODEC_CAP_DELAY capability set have a delay
3568 * between input and output, these need to be fed with avpkt->data=NULL,
3569 * avpkt->size=0 at the end to return the remaining frames.
3571 * @param avctx the codec context
3572 * @param[out] samples the output buffer, sample type in avctx->sample_fmt
3573 * If the sample format is planar, each channel plane will
3574 * be the same size, with no padding between channels.
3575 * @param[in,out] frame_size_ptr the output buffer size in bytes
3576 * @param[in] avpkt The input AVPacket containing the input buffer.
3577 * You can create such packet with av_init_packet() and by then setting
3578 * data and size, some decoders might in addition need other fields.
3579 * All decoders are designed to use the least fields possible though.
3580 * @return On error a negative value is returned, otherwise the number of bytes
3581 * used or zero if no frame data was decompressed (used) from the input AVPacket.
3583 attribute_deprecated int avcodec_decode_audio3(AVCodecContext *avctx, int16_t *samples,
3584 int *frame_size_ptr,
3589 * Decode the audio frame of size avpkt->size from avpkt->data into frame.
3591 * Some decoders may support multiple frames in a single AVPacket. Such
3592 * decoders would then just decode the first frame. In this case,
3593 * avcodec_decode_audio4 has to be called again with an AVPacket containing
3594 * the remaining data in order to decode the second frame, etc...
3595 * Even if no frames are returned, the packet needs to be fed to the decoder
3596 * with remaining data until it is completely consumed or an error occurs.
3598 * @warning The input buffer, avpkt->data must be FF_INPUT_BUFFER_PADDING_SIZE
3599 * larger than the actual read bytes because some optimized bitstream
3600 * readers read 32 or 64 bits at once and could read over the end.
3602 * @note You might have to align the input buffer. The alignment requirements
3603 * depend on the CPU and the decoder.
3605 * @param avctx the codec context
3606 * @param[out] frame The AVFrame in which to store decoded audio samples.
3607 * Decoders request a buffer of a particular size by setting
3608 * AVFrame.nb_samples prior to calling get_buffer(). The
3609 * decoder may, however, only utilize part of the buffer by
3610 * setting AVFrame.nb_samples to a smaller value in the
3612 * @param[out] got_frame_ptr Zero if no frame could be decoded, otherwise it is
3614 * @param[in] avpkt The input AVPacket containing the input buffer.
3615 * At least avpkt->data and avpkt->size should be set. Some
3616 * decoders might also require additional fields to be set.
3617 * @return A negative error code is returned if an error occurred during
3618 * decoding, otherwise the number of bytes consumed from the input
3619 * AVPacket is returned.
3621 int avcodec_decode_audio4(AVCodecContext *avctx, AVFrame *frame,
3622 int *got_frame_ptr, AVPacket *avpkt);
3625 * Decode the video frame of size avpkt->size from avpkt->data into picture.
3626 * Some decoders may support multiple frames in a single AVPacket, such
3627 * decoders would then just decode the first frame.
3629 * @warning The input buffer must be FF_INPUT_BUFFER_PADDING_SIZE larger than
3630 * the actual read bytes because some optimized bitstream readers read 32 or 64
3631 * bits at once and could read over the end.
3633 * @warning The end of the input buffer buf should be set to 0 to ensure that
3634 * no overreading happens for damaged MPEG streams.
3636 * @note You might have to align the input buffer avpkt->data.
3637 * The alignment requirements depend on the CPU: on some CPUs it isn't
3638 * necessary at all, on others it won't work at all if not aligned and on others
3639 * it will work but it will have an impact on performance.
3641 * In practice, avpkt->data should have 4 byte alignment at minimum.
3643 * @note Codecs which have the CODEC_CAP_DELAY capability set have a delay
3644 * between input and output, these need to be fed with avpkt->data=NULL,
3645 * avpkt->size=0 at the end to return the remaining frames.
3647 * @param avctx the codec context
3648 * @param[out] picture The AVFrame in which the decoded video frame will be stored.
3649 * Use avcodec_alloc_frame to get an AVFrame, the codec will
3650 * allocate memory for the actual bitmap.
3651 * with default get/release_buffer(), the decoder frees/reuses the bitmap as it sees fit.
3652 * with overridden get/release_buffer() (needs CODEC_CAP_DR1) the user decides into what buffer the decoder
3653 * decodes and the decoder tells the user once it does not need the data anymore,
3654 * the user app can at this point free/reuse/keep the memory as it sees fit.
3656 * @param[in] avpkt The input AVpacket containing the input buffer.
3657 * You can create such packet with av_init_packet() and by then setting
3658 * data and size, some decoders might in addition need other fields like
3659 * flags&AV_PKT_FLAG_KEY. All decoders are designed to use the least
3661 * @param[in,out] got_picture_ptr Zero if no frame could be decompressed, otherwise, it is nonzero.
3662 * @return On error a negative value is returned, otherwise the number of bytes
3663 * used or zero if no frame could be decompressed.
3665 int avcodec_decode_video2(AVCodecContext *avctx, AVFrame *picture,
3666 int *got_picture_ptr,
3670 * Decode a subtitle message.
3671 * Return a negative value on error, otherwise return the number of bytes used.
3672 * If no subtitle could be decompressed, got_sub_ptr is zero.
3673 * Otherwise, the subtitle is stored in *sub.
3674 * Note that CODEC_CAP_DR1 is not available for subtitle codecs. This is for
3675 * simplicity, because the performance difference is expect to be negligible
3676 * and reusing a get_buffer written for video codecs would probably perform badly
3677 * due to a potentially very different allocation pattern.
3679 * @param avctx the codec context
3680 * @param[out] sub The AVSubtitle in which the decoded subtitle will be stored, must be
3681 freed with avsubtitle_free if *got_sub_ptr is set.
3682 * @param[in,out] got_sub_ptr Zero if no subtitle could be decompressed, otherwise, it is nonzero.
3683 * @param[in] avpkt The input AVPacket containing the input buffer.
3685 int avcodec_decode_subtitle2(AVCodecContext *avctx, AVSubtitle *sub,
3690 * Free all allocated data in the given subtitle struct.
3692 * @param sub AVSubtitle to free.
3694 void avsubtitle_free(AVSubtitle *sub);
3696 #if FF_API_OLD_ENCODE_AUDIO
3698 * Encode an audio frame from samples into buf.
3700 * @deprecated Use avcodec_encode_audio2 instead.
3702 * @note The output buffer should be at least FF_MIN_BUFFER_SIZE bytes large.
3703 * However, for codecs with avctx->frame_size equal to 0 (e.g. PCM) the user
3704 * will know how much space is needed because it depends on the value passed
3705 * in buf_size as described below. In that case a lower value can be used.
3707 * @param avctx the codec context
3708 * @param[out] buf the output buffer
3709 * @param[in] buf_size the output buffer size
3710 * @param[in] samples the input buffer containing the samples
3711 * The number of samples read from this buffer is frame_size*channels,
3712 * both of which are defined in avctx.
3713 * For codecs which have avctx->frame_size equal to 0 (e.g. PCM) the number of
3714 * samples read from samples is equal to:
3715 * buf_size * 8 / (avctx->channels * av_get_bits_per_sample(avctx->codec_id))
3716 * This also implies that av_get_bits_per_sample() must not return 0 for these
3718 * @return On error a negative value is returned, on success zero or the number
3719 * of bytes used to encode the data read from the input buffer.
3721 int attribute_deprecated avcodec_encode_audio(AVCodecContext *avctx,
3722 uint8_t *buf, int buf_size,
3723 const short *samples);
3727 * Encode a frame of audio.
3729 * Takes input samples from frame and writes the next output packet, if
3730 * available, to avpkt. The output packet does not necessarily contain data for
3731 * the most recent frame, as encoders can delay, split, and combine input frames
3732 * internally as needed.
3734 * @param avctx codec context
3735 * @param avpkt output AVPacket.
3736 * The user can supply an output buffer by setting
3737 * avpkt->data and avpkt->size prior to calling the
3738 * function, but if the size of the user-provided data is not
3739 * large enough, encoding will fail. All other AVPacket fields
3740 * will be reset by the encoder using av_init_packet(). If
3741 * avpkt->data is NULL, the encoder will allocate it.
3742 * The encoder will set avpkt->size to the size of the
3744 * @param[in] frame AVFrame containing the raw audio data to be encoded.
3745 * May be NULL when flushing an encoder that has the
3746 * CODEC_CAP_DELAY capability set.
3747 * There are 2 codec capabilities that affect the allowed
3748 * values of frame->nb_samples.
3749 * If CODEC_CAP_SMALL_LAST_FRAME is set, then only the final
3750 * frame may be smaller than avctx->frame_size, and all other
3751 * frames must be equal to avctx->frame_size.
3752 * If CODEC_CAP_VARIABLE_FRAME_SIZE is set, then each frame
3753 * can have any number of samples.
3754 * If neither is set, frame->nb_samples must be equal to
3755 * avctx->frame_size for all frames.
3756 * @param[out] got_packet_ptr This field is set to 1 by libavcodec if the
3757 * output packet is non-empty, and to 0 if it is
3758 * empty. If the function returns an error, the
3759 * packet can be assumed to be invalid, and the
3760 * value of got_packet_ptr is undefined and should
3762 * @return 0 on success, negative error code on failure
3764 int avcodec_encode_audio2(AVCodecContext *avctx, AVPacket *avpkt,
3765 const AVFrame *frame, int *got_packet_ptr);
3768 * Fill audio frame data and linesize.
3769 * AVFrame extended_data channel pointers are allocated if necessary for
3772 * @param frame the AVFrame
3773 * frame->nb_samples must be set prior to calling the
3774 * function. This function fills in frame->data,
3775 * frame->extended_data, frame->linesize[0].
3776 * @param nb_channels channel count
3777 * @param sample_fmt sample format
3778 * @param buf buffer to use for frame data
3779 * @param buf_size size of buffer
3780 * @param align plane size sample alignment
3781 * @return 0 on success, negative error code on failure
3783 int avcodec_fill_audio_frame(AVFrame *frame, int nb_channels,
3784 enum AVSampleFormat sample_fmt, const uint8_t *buf,
3785 int buf_size, int align);
3787 #if FF_API_OLD_ENCODE_VIDEO
3789 * @deprecated use avcodec_encode_video2() instead.
3791 * Encode a video frame from pict into buf.
3792 * The input picture should be
3793 * stored using a specific format, namely avctx.pix_fmt.
3795 * @param avctx the codec context
3796 * @param[out] buf the output buffer for the bitstream of encoded frame
3797 * @param[in] buf_size the size of the output buffer in bytes
3798 * @param[in] pict the input picture to encode
3799 * @return On error a negative value is returned, on success zero or the number
3800 * of bytes used from the output buffer.
3802 attribute_deprecated
3803 int avcodec_encode_video(AVCodecContext *avctx, uint8_t *buf, int buf_size,
3804 const AVFrame *pict);
3808 * Encode a frame of video.
3810 * Takes input raw video data from frame and writes the next output packet, if
3811 * available, to avpkt. The output packet does not necessarily contain data for
3812 * the most recent frame, as encoders can delay and reorder input frames
3813 * internally as needed.
3815 * @param avctx codec context
3816 * @param avpkt output AVPacket.
3817 * The user can supply an output buffer by setting
3818 * avpkt->data and avpkt->size prior to calling the
3819 * function, but if the size of the user-provided data is not
3820 * large enough, encoding will fail. All other AVPacket fields
3821 * will be reset by the encoder using av_init_packet(). If
3822 * avpkt->data is NULL, the encoder will allocate it.
3823 * The encoder will set avpkt->size to the size of the
3824 * output packet. The returned data (if any) belongs to the
3825 * caller, he is responsible for freeing it.
3826 * @param[in] frame AVFrame containing the raw video data to be encoded.
3827 * May be NULL when flushing an encoder that has the
3828 * CODEC_CAP_DELAY capability set.
3829 * @param[out] got_packet_ptr This field is set to 1 by libavcodec if the
3830 * output packet is non-empty, and to 0 if it is
3831 * empty. If the function returns an error, the
3832 * packet can be assumed to be invalid, and the
3833 * value of got_packet_ptr is undefined and should
3835 * @return 0 on success, negative error code on failure
3837 int avcodec_encode_video2(AVCodecContext *avctx, AVPacket *avpkt,
3838 const AVFrame *frame, int *got_packet_ptr);
3840 int avcodec_encode_subtitle(AVCodecContext *avctx, uint8_t *buf, int buf_size,
3841 const AVSubtitle *sub);
3844 * Close a given AVCodecContext and free all the data associated with it
3845 * (but not the AVCodecContext itself).
3847 * Calling this function on an AVCodecContext that hasn't been opened will free
3848 * the codec-specific data allocated in avcodec_alloc_context3() /
3849 * avcodec_get_context_defaults3() with a non-NULL codec. Subsequent calls will
3852 int avcodec_close(AVCodecContext *avctx);
3855 * Register all the codecs, parsers and bitstream filters which were enabled at
3856 * configuration time. If you do not call this function you can select exactly
3857 * which formats you want to support, by using the individual registration
3860 * @see avcodec_register
3861 * @see av_register_codec_parser
3862 * @see av_register_bitstream_filter
3864 void avcodec_register_all(void);
3867 * Flush buffers, should be called when seeking or when switching to a different stream.
3869 void avcodec_flush_buffers(AVCodecContext *avctx);
3871 void avcodec_default_free_buffers(AVCodecContext *s);
3873 /* misc useful functions */
3876 * Return codec bits per sample.
3878 * @param[in] codec_id the codec
3879 * @return Number of bits per sample or zero if unknown for the given codec.
3881 int av_get_bits_per_sample(enum CodecID codec_id);
3884 typedef struct AVCodecParserContext {
3886 struct AVCodecParser *parser;
3887 int64_t frame_offset; /* offset of the current frame */
3888 int64_t cur_offset; /* current offset
3889 (incremented by each av_parser_parse()) */
3890 int64_t next_frame_offset; /* offset of the next frame */
3892 int pict_type; /* XXX: Put it back in AVCodecContext. */
3894 * This field is used for proper frame duration computation in lavf.
3895 * It signals, how much longer the frame duration of the current frame
3896 * is compared to normal frame duration.
3898 * frame_duration = (1 + repeat_pict) * time_base
3900 * It is used by codecs like H.264 to display telecined material.
3902 int repeat_pict; /* XXX: Put it back in AVCodecContext. */
3903 int64_t pts; /* pts of the current frame */
3904 int64_t dts; /* dts of the current frame */
3909 int fetch_timestamp;
3911 #define AV_PARSER_PTS_NB 4
3912 int cur_frame_start_index;
3913 int64_t cur_frame_offset[AV_PARSER_PTS_NB];
3914 int64_t cur_frame_pts[AV_PARSER_PTS_NB];
3915 int64_t cur_frame_dts[AV_PARSER_PTS_NB];
3918 #define PARSER_FLAG_COMPLETE_FRAMES 0x0001
3919 #define PARSER_FLAG_ONCE 0x0002
3920 /// Set if the parser has a valid file offset
3921 #define PARSER_FLAG_FETCHED_OFFSET 0x0004
3923 int64_t offset; ///< byte offset from starting packet start
3924 int64_t cur_frame_end[AV_PARSER_PTS_NB];
3927 * Set by parser to 1 for key frames and 0 for non-key frames.
3928 * It is initialized to -1, so if the parser doesn't set this flag,
3929 * old-style fallback using AV_PICTURE_TYPE_I picture type as key frames
3935 * Time difference in stream time base units from the pts of this
3936 * packet to the point at which the output from the decoder has converged
3937 * independent from the availability of previous frames. That is, the
3938 * frames are virtually identical no matter if decoding started from
3939 * the very first frame or from this keyframe.
3940 * Is AV_NOPTS_VALUE if unknown.
3941 * This field is not the display duration of the current frame.
3942 * This field has no meaning if the packet does not have AV_PKT_FLAG_KEY
3945 * The purpose of this field is to allow seeking in streams that have no
3946 * keyframes in the conventional sense. It corresponds to the
3947 * recovery point SEI in H.264 and match_time_delta in NUT. It is also
3948 * essential for some types of subtitle streams to ensure that all
3949 * subtitles are correctly displayed after seeking.
3951 int64_t convergence_duration;
3953 // Timestamp generation support:
3955 * Synchronization point for start of timestamp generation.
3957 * Set to >0 for sync point, 0 for no sync point and <0 for undefined
3960 * For example, this corresponds to presence of H.264 buffering period
3966 * Offset of the current timestamp against last timestamp sync point in
3967 * units of AVCodecContext.time_base.
3969 * Set to INT_MIN when dts_sync_point unused. Otherwise, it must
3970 * contain a valid timestamp offset.
3972 * Note that the timestamp of sync point has usually a nonzero
3973 * dts_ref_dts_delta, which refers to the previous sync point. Offset of
3974 * the next frame after timestamp sync point will be usually 1.
3976 * For example, this corresponds to H.264 cpb_removal_delay.
3978 int dts_ref_dts_delta;
3981 * Presentation delay of current frame in units of AVCodecContext.time_base.
3983 * Set to INT_MIN when dts_sync_point unused. Otherwise, it must
3984 * contain valid non-negative timestamp delta (presentation time of a frame
3985 * must not lie in the past).
3987 * This delay represents the difference between decoding and presentation
3988 * time of the frame.
3990 * For example, this corresponds to H.264 dpb_output_delay.
3995 * Position of the packet in file.
3997 * Analogous to cur_frame_pts/dts
3999 int64_t cur_frame_pos[AV_PARSER_PTS_NB];
4002 * Byte position of currently parsed frame in stream.
4007 * Previous frame byte position.
4012 * Duration of the current frame.
4013 * For audio, this is in units of 1 / AVCodecContext.sample_rate.
4014 * For all other types, this is in units of AVCodecContext.time_base.
4017 } AVCodecParserContext;
4019 typedef struct AVCodecParser {
4020 int codec_ids[5]; /* several codec IDs are permitted */
4022 int (*parser_init)(AVCodecParserContext *s);
4023 int (*parser_parse)(AVCodecParserContext *s,
4024 AVCodecContext *avctx,
4025 const uint8_t **poutbuf, int *poutbuf_size,
4026 const uint8_t *buf, int buf_size);
4027 void (*parser_close)(AVCodecParserContext *s);
4028 int (*split)(AVCodecContext *avctx, const uint8_t *buf, int buf_size);
4029 struct AVCodecParser *next;
4032 AVCodecParser *av_parser_next(AVCodecParser *c);
4034 void av_register_codec_parser(AVCodecParser *parser);
4035 AVCodecParserContext *av_parser_init(int codec_id);
4040 * @param s parser context.
4041 * @param avctx codec context.
4042 * @param poutbuf set to pointer to parsed buffer or NULL if not yet finished.
4043 * @param poutbuf_size set to size of parsed buffer or zero if not yet finished.
4044 * @param buf input buffer.
4045 * @param buf_size input length, to signal EOF, this should be 0 (so that the last frame can be output).
4046 * @param pts input presentation timestamp.
4047 * @param dts input decoding timestamp.
4048 * @param pos input byte position in stream.
4049 * @return the number of bytes of the input bitstream used.
4054 * len = av_parser_parse2(myparser, AVCodecContext, &data, &size,
4061 * decode_frame(data, size);
4065 int av_parser_parse2(AVCodecParserContext *s,
4066 AVCodecContext *avctx,
4067 uint8_t **poutbuf, int *poutbuf_size,
4068 const uint8_t *buf, int buf_size,
4069 int64_t pts, int64_t dts,
4072 int av_parser_change(AVCodecParserContext *s,
4073 AVCodecContext *avctx,
4074 uint8_t **poutbuf, int *poutbuf_size,
4075 const uint8_t *buf, int buf_size, int keyframe);
4076 void av_parser_close(AVCodecParserContext *s);
4079 typedef struct AVBitStreamFilterContext {
4081 struct AVBitStreamFilter *filter;
4082 AVCodecParserContext *parser;
4083 struct AVBitStreamFilterContext *next;
4084 } AVBitStreamFilterContext;
4087 typedef struct AVBitStreamFilter {
4090 int (*filter)(AVBitStreamFilterContext *bsfc,
4091 AVCodecContext *avctx, const char *args,
4092 uint8_t **poutbuf, int *poutbuf_size,
4093 const uint8_t *buf, int buf_size, int keyframe);
4094 void (*close)(AVBitStreamFilterContext *bsfc);
4095 struct AVBitStreamFilter *next;
4096 } AVBitStreamFilter;
4098 void av_register_bitstream_filter(AVBitStreamFilter *bsf);
4099 AVBitStreamFilterContext *av_bitstream_filter_init(const char *name);
4100 int av_bitstream_filter_filter(AVBitStreamFilterContext *bsfc,
4101 AVCodecContext *avctx, const char *args,
4102 uint8_t **poutbuf, int *poutbuf_size,
4103 const uint8_t *buf, int buf_size, int keyframe);
4104 void av_bitstream_filter_close(AVBitStreamFilterContext *bsf);
4106 AVBitStreamFilter *av_bitstream_filter_next(AVBitStreamFilter *f);
4111 * Reallocate the given block if it is not large enough, otherwise do nothing.
4115 void *av_fast_realloc(void *ptr, unsigned int *size, size_t min_size);
4118 * Allocate a buffer, reusing the given one if large enough.
4120 * Contrary to av_fast_realloc the current buffer contents might not be
4121 * preserved and on error the old buffer is freed, thus no special
4122 * handling to avoid memleaks is necessary.
4124 * @param ptr pointer to pointer to already allocated buffer, overwritten with pointer to new buffer
4125 * @param size size of the buffer *ptr points to
4126 * @param min_size minimum size of *ptr buffer after returning, *ptr will be NULL and
4127 * *size 0 if an error occurred.
4129 void av_fast_malloc(void *ptr, unsigned int *size, size_t min_size);
4132 * Allocate a buffer with padding, reusing the given one if large enough.
4134 * Same behaviour av_fast_malloc but the buffer has additional
4135 * FF_INPUT_PADDING_SIZE at the end which will always memset to 0.
4138 void av_fast_padded_malloc(void *ptr, unsigned int *size, size_t min_size);
4141 * Copy image src to dst. Wraps av_picture_data_copy() above.
4143 void av_picture_copy(AVPicture *dst, const AVPicture *src,
4144 enum PixelFormat pix_fmt, int width, int height);
4147 * Crop image top and left side.
4149 int av_picture_crop(AVPicture *dst, const AVPicture *src,
4150 enum PixelFormat pix_fmt, int top_band, int left_band);
4155 int av_picture_pad(AVPicture *dst, const AVPicture *src, int height, int width, enum PixelFormat pix_fmt,
4156 int padtop, int padbottom, int padleft, int padright, int *color);
4159 * Encode extradata length to a buffer. Used by xiph codecs.
4161 * @param s buffer to write to; must be at least (v/255+1) bytes long
4162 * @param v size of extradata in bytes
4163 * @return number of bytes written to the buffer.
4165 unsigned int av_xiphlacing(unsigned char *s, unsigned int v);
4168 * Log a generic warning message about a missing feature. This function is
4169 * intended to be used internally by Libav (libavcodec, libavformat, etc.)
4170 * only, and would normally not be used by applications.
4171 * @param[in] avc a pointer to an arbitrary struct of which the first field is
4172 * a pointer to an AVClass struct
4173 * @param[in] feature string containing the name of the missing feature
4174 * @param[in] want_sample indicates if samples are wanted which exhibit this feature.
4175 * If want_sample is non-zero, additional verbage will be added to the log
4176 * message which tells the user how to report samples to the development
4179 void av_log_missing_feature(void *avc, const char *feature, int want_sample);
4182 * Log a generic warning message asking for a sample. This function is
4183 * intended to be used internally by Libav (libavcodec, libavformat, etc.)
4184 * only, and would normally not be used by applications.
4185 * @param[in] avc a pointer to an arbitrary struct of which the first field is
4186 * a pointer to an AVClass struct
4187 * @param[in] msg string containing an optional message, or NULL if no message
4189 void av_log_ask_for_sample(void *avc, const char *msg, ...) av_printf_format(2, 3);
4192 * Register the hardware accelerator hwaccel.
4194 void av_register_hwaccel(AVHWAccel *hwaccel);
4197 * If hwaccel is NULL, returns the first registered hardware accelerator,
4198 * if hwaccel is non-NULL, returns the next registered hardware accelerator
4199 * after hwaccel, or NULL if hwaccel is the last one.
4201 AVHWAccel *av_hwaccel_next(AVHWAccel *hwaccel);
4205 * Lock operation used by lockmgr
4208 AV_LOCK_CREATE, ///< Create a mutex
4209 AV_LOCK_OBTAIN, ///< Lock the mutex
4210 AV_LOCK_RELEASE, ///< Unlock the mutex
4211 AV_LOCK_DESTROY, ///< Free mutex resources
4215 * Register a user provided lock manager supporting the operations
4216 * specified by AVLockOp. mutex points to a (void *) where the
4217 * lockmgr should store/get a pointer to a user allocated mutex. It's
4218 * NULL upon AV_LOCK_CREATE and != NULL for all other ops.
4220 * @param cb User defined callback. Note: Libav may invoke calls to this
4221 * callback during the call to av_lockmgr_register().
4222 * Thus, the application must be prepared to handle that.
4223 * If cb is set to NULL the lockmgr will be unregistered.
4224 * Also note that during unregistration the previously registered
4225 * lockmgr callback may also be invoked.
4227 int av_lockmgr_register(int (*cb)(void **mutex, enum AVLockOp op));
4230 * Get the type of the given codec.
4232 enum AVMediaType avcodec_get_type(enum CodecID codec_id);
4235 * Get the AVClass for AVCodecContext. It can be used in combination with
4236 * AV_OPT_SEARCH_FAKE_OBJ for examining options.
4238 * @see av_opt_find().
4240 const AVClass *avcodec_get_class(void);
4243 * @return a positive value if s is open (i.e. avcodec_open2() was called on it
4244 * with no corresponding avcodec_close()), 0 otherwise.
4246 int avcodec_is_open(AVCodecContext *s);
4248 #endif /* AVCODEC_AVCODEC_H */