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,
186 #if LIBAVCODEC_VERSION_MAJOR == 53
194 CODEC_ID_BETHSOFTVID,
206 #if LIBAVCODEC_VERSION_MAJOR == 53
214 CODEC_ID_MOTIONPIXELS,
232 CODEC_ID_IFF_BYTERUN1,
248 #if LIBAVCODEC_VERSION_MAJOR == 53
259 /* various PCM "codecs" */
260 CODEC_ID_FIRST_AUDIO = 0x10000, ///< A dummy id pointing at the start of audio codecs
261 CODEC_ID_PCM_S16LE = 0x10000,
277 CODEC_ID_PCM_S24DAUD,
279 CODEC_ID_PCM_S16LE_PLANAR,
288 CODEC_ID_PCM_S8_PLANAR,
290 /* various ADPCM codecs */
291 CODEC_ID_ADPCM_IMA_QT = 0x11000,
292 CODEC_ID_ADPCM_IMA_WAV,
293 CODEC_ID_ADPCM_IMA_DK3,
294 CODEC_ID_ADPCM_IMA_DK4,
295 CODEC_ID_ADPCM_IMA_WS,
296 CODEC_ID_ADPCM_IMA_SMJPEG,
305 CODEC_ID_ADPCM_YAMAHA,
306 CODEC_ID_ADPCM_SBPRO_4,
307 CODEC_ID_ADPCM_SBPRO_3,
308 CODEC_ID_ADPCM_SBPRO_2,
310 CODEC_ID_ADPCM_IMA_AMV,
311 CODEC_ID_ADPCM_EA_R1,
312 CODEC_ID_ADPCM_EA_R3,
313 CODEC_ID_ADPCM_EA_R2,
314 CODEC_ID_ADPCM_IMA_EA_SEAD,
315 CODEC_ID_ADPCM_IMA_EA_EACS,
316 CODEC_ID_ADPCM_EA_XAS,
317 CODEC_ID_ADPCM_EA_MAXIS_XA,
318 CODEC_ID_ADPCM_IMA_ISS,
320 CODEC_ID_ADPCM_IMA_APC,
323 CODEC_ID_AMR_NB = 0x12000,
326 /* RealAudio codecs*/
327 CODEC_ID_RA_144 = 0x13000,
330 /* various DPCM codecs */
331 CODEC_ID_ROQ_DPCM = 0x14000,
332 CODEC_ID_INTERPLAY_DPCM,
337 CODEC_ID_MP2 = 0x15000,
338 CODEC_ID_MP3, ///< preferred ID for decoding MPEG audio layer 1, 2 or 3
349 #if LIBAVCODEC_VERSION_MAJOR == 53
358 CODEC_ID_WESTWOOD_SND1,
359 CODEC_ID_GSM, ///< as in Berlin toast format
367 CODEC_ID_DSICINAUDIO,
371 CODEC_ID_GSM_MS, /* as found in WAV */
380 CODEC_ID_WMALOSSLESS,
389 CODEC_ID_BINKAUDIO_RDFT,
390 CODEC_ID_BINKAUDIO_DCT,
394 #if LIBAVCODEC_VERSION_MAJOR > 53
402 /* subtitle codecs */
403 CODEC_ID_FIRST_SUBTITLE = 0x17000, ///< A dummy ID pointing at the start of subtitle codecs.
404 CODEC_ID_DVD_SUBTITLE = 0x17000,
405 CODEC_ID_DVB_SUBTITLE,
406 CODEC_ID_TEXT, ///< raw UTF-8 text
410 CODEC_ID_HDMV_PGS_SUBTITLE,
411 CODEC_ID_DVB_TELETEXT,
414 /* other specific kind of codecs (generally used for attachments) */
415 CODEC_ID_FIRST_UNKNOWN = 0x18000, ///< A dummy ID pointing at the start of various fake codecs.
416 CODEC_ID_TTF = 0x18000,
418 CODEC_ID_PROBE = 0x19000, ///< codec_id is not known (like CODEC_ID_NONE) but lavf should attempt to identify it
420 CODEC_ID_MPEG2TS = 0x20000, /**< _FAKE_ codec to indicate a raw MPEG-2 TS
421 * stream (only used by libavformat) */
422 CODEC_ID_MPEG4SYSTEMS = 0x20001, /**< _FAKE_ codec to indicate a MPEG-4 Systems
423 * stream (only used by libavformat) */
424 CODEC_ID_FFMETADATA = 0x21000, ///< Dummy codec for streams containing only metadata information.
427 #if FF_API_OLD_DECODE_AUDIO
429 #define AVCODEC_MAX_AUDIO_FRAME_SIZE 192000 // 1 second of 48khz 32bit audio
433 * Required number of additionally allocated bytes at the end of the input bitstream for decoding.
434 * This is mainly needed because some optimized bitstream readers read
435 * 32 or 64 bit at once and could read over the end.<br>
436 * Note: If the first 23 bits of the additional bytes are not 0, then damaged
437 * MPEG bitstreams could cause overread and segfault.
439 #define FF_INPUT_BUFFER_PADDING_SIZE 8
442 * minimum encoding buffer size
443 * Used to avoid some checks during header writing.
445 #define FF_MIN_BUFFER_SIZE 16384
449 * motion estimation type.
452 ME_ZERO = 1, ///< no search, that is use 0,0 vector whenever one is needed
456 ME_EPZS, ///< enhanced predictive zonal search
457 ME_X1, ///< reserved for experiments
458 ME_HEX, ///< hexagon based search
459 ME_UMH, ///< uneven multi-hexagon search
460 ME_ITER, ///< iterative search
461 ME_TESA, ///< transformed exhaustive search algorithm
465 /* We leave some space between them for extensions (drop some
466 * keyframes for intra-only or drop just some bidir frames). */
467 AVDISCARD_NONE =-16, ///< discard nothing
468 AVDISCARD_DEFAULT= 0, ///< discard useless packets like 0 size packets in avi
469 AVDISCARD_NONREF = 8, ///< discard all non reference
470 AVDISCARD_BIDIR = 16, ///< discard all bidirectional frames
471 AVDISCARD_NONKEY = 32, ///< discard all frames except keyframes
472 AVDISCARD_ALL = 48, ///< discard all
475 enum AVColorPrimaries{
476 AVCOL_PRI_BT709 =1, ///< also ITU-R BT1361 / IEC 61966-2-4 / SMPTE RP177 Annex B
477 AVCOL_PRI_UNSPECIFIED=2,
479 AVCOL_PRI_BT470BG =5, ///< also ITU-R BT601-6 625 / ITU-R BT1358 625 / ITU-R BT1700 625 PAL & SECAM
480 AVCOL_PRI_SMPTE170M =6, ///< also ITU-R BT601-6 525 / ITU-R BT1358 525 / ITU-R BT1700 NTSC
481 AVCOL_PRI_SMPTE240M =7, ///< functionally identical to above
483 AVCOL_PRI_NB , ///< Not part of ABI
486 enum AVColorTransferCharacteristic{
487 AVCOL_TRC_BT709 =1, ///< also ITU-R BT1361
488 AVCOL_TRC_UNSPECIFIED=2,
489 AVCOL_TRC_GAMMA22 =4, ///< also ITU-R BT470M / ITU-R BT1700 625 PAL & SECAM
490 AVCOL_TRC_GAMMA28 =5, ///< also ITU-R BT470BG
491 AVCOL_TRC_NB , ///< Not part of ABI
496 AVCOL_SPC_BT709 =1, ///< also ITU-R BT1361 / IEC 61966-2-4 xvYCC709 / SMPTE RP177 Annex B
497 AVCOL_SPC_UNSPECIFIED=2,
499 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
500 AVCOL_SPC_SMPTE170M =6, ///< also ITU-R BT601-6 525 / ITU-R BT1358 525 / ITU-R BT1700 NTSC / functionally identical to above
501 AVCOL_SPC_SMPTE240M =7,
502 AVCOL_SPC_NB , ///< Not part of ABI
506 AVCOL_RANGE_UNSPECIFIED=0,
507 AVCOL_RANGE_MPEG =1, ///< the normal 219*2^(n-8) "MPEG" YUV ranges
508 AVCOL_RANGE_JPEG =2, ///< the normal 2^n-1 "JPEG" YUV ranges
509 AVCOL_RANGE_NB , ///< Not part of ABI
513 * X X 3 4 X X are luma samples,
514 * 1 2 1-6 are possible chroma positions
515 * X X 5 6 X 0 is undefined/unknown position
517 enum AVChromaLocation{
518 AVCHROMA_LOC_UNSPECIFIED=0,
519 AVCHROMA_LOC_LEFT =1, ///< mpeg2/4, h264 default
520 AVCHROMA_LOC_CENTER =2, ///< mpeg1, jpeg, h263
521 AVCHROMA_LOC_TOPLEFT =3, ///< DV
523 AVCHROMA_LOC_BOTTOMLEFT =5,
524 AVCHROMA_LOC_BOTTOM =6,
525 AVCHROMA_LOC_NB , ///< Not part of ABI
528 enum AVAudioServiceType {
529 AV_AUDIO_SERVICE_TYPE_MAIN = 0,
530 AV_AUDIO_SERVICE_TYPE_EFFECTS = 1,
531 AV_AUDIO_SERVICE_TYPE_VISUALLY_IMPAIRED = 2,
532 AV_AUDIO_SERVICE_TYPE_HEARING_IMPAIRED = 3,
533 AV_AUDIO_SERVICE_TYPE_DIALOGUE = 4,
534 AV_AUDIO_SERVICE_TYPE_COMMENTARY = 5,
535 AV_AUDIO_SERVICE_TYPE_EMERGENCY = 6,
536 AV_AUDIO_SERVICE_TYPE_VOICE_OVER = 7,
537 AV_AUDIO_SERVICE_TYPE_KARAOKE = 8,
538 AV_AUDIO_SERVICE_TYPE_NB , ///< Not part of ABI
541 typedef struct RcOverride{
544 int qscale; // If this is 0 then quality_factor will be used instead.
545 float quality_factor;
548 #define FF_MAX_B_FRAMES 16
551 These flags can be passed in AVCodecContext.flags before initialization.
552 Note: Not everything is supported yet.
555 #define CODEC_FLAG_QSCALE 0x0002 ///< Use fixed qscale.
556 #define CODEC_FLAG_4MV 0x0004 ///< 4 MV per MB allowed / advanced prediction for H.263.
557 #define CODEC_FLAG_QPEL 0x0010 ///< Use qpel MC.
558 #define CODEC_FLAG_GMC 0x0020 ///< Use GMC.
559 #define CODEC_FLAG_MV0 0x0040 ///< Always try a MB with MV=<0,0>.
561 * The parent program guarantees that the input for B-frames containing
562 * streams is not written to for at least s->max_b_frames+1 frames, if
563 * this is not set the input will be copied.
565 #define CODEC_FLAG_INPUT_PRESERVED 0x0100
566 #define CODEC_FLAG_PASS1 0x0200 ///< Use internal 2pass ratecontrol in first pass mode.
567 #define CODEC_FLAG_PASS2 0x0400 ///< Use internal 2pass ratecontrol in second pass mode.
568 #define CODEC_FLAG_GRAY 0x2000 ///< Only decode/encode grayscale.
569 #define CODEC_FLAG_EMU_EDGE 0x4000 ///< Don't draw edges.
570 #define CODEC_FLAG_PSNR 0x8000 ///< error[?] variables will be set during encoding.
571 #define CODEC_FLAG_TRUNCATED 0x00010000 /** Input bitstream might be truncated at a random
572 location instead of only at frame boundaries. */
573 #define CODEC_FLAG_NORMALIZE_AQP 0x00020000 ///< Normalize adaptive quantization.
574 #define CODEC_FLAG_INTERLACED_DCT 0x00040000 ///< Use interlaced DCT.
575 #define CODEC_FLAG_LOW_DELAY 0x00080000 ///< Force low delay.
576 #define CODEC_FLAG_GLOBAL_HEADER 0x00400000 ///< Place global headers in extradata instead of every keyframe.
577 #define CODEC_FLAG_BITEXACT 0x00800000 ///< Use only bitexact stuff (except (I)DCT).
578 /* Fx : Flag for h263+ extra options */
579 #define CODEC_FLAG_AC_PRED 0x01000000 ///< H.263 advanced intra coding / MPEG-4 AC prediction
580 #define CODEC_FLAG_CBP_RD 0x04000000 ///< Use rate distortion optimization for cbp.
581 #define CODEC_FLAG_QP_RD 0x08000000 ///< Use rate distortion optimization for qp selectioon.
582 #define CODEC_FLAG_LOOP_FILTER 0x00000800 ///< loop filter
583 #define CODEC_FLAG_INTERLACED_ME 0x20000000 ///< interlaced motion estimation
584 #define CODEC_FLAG_CLOSED_GOP 0x80000000
585 #define CODEC_FLAG2_FAST 0x00000001 ///< Allow non spec compliant speedup tricks.
586 #define CODEC_FLAG2_STRICT_GOP 0x00000002 ///< Strictly enforce GOP size.
587 #define CODEC_FLAG2_NO_OUTPUT 0x00000004 ///< Skip bitstream encoding.
588 #define CODEC_FLAG2_LOCAL_HEADER 0x00000008 ///< Place global headers at every keyframe instead of in extradata.
589 #define CODEC_FLAG2_SKIP_RD 0x00004000 ///< RD optimal MB level residual skipping
590 #define CODEC_FLAG2_CHUNKS 0x00008000 ///< Input bitstream might be truncated at a packet boundaries instead of only at frame boundaries.
592 /* Unsupported options :
593 * Syntax Arithmetic coding (SAC)
594 * Reference Picture Selection
595 * Independent Segment Decoding */
597 /* codec capabilities */
599 #define CODEC_CAP_DRAW_HORIZ_BAND 0x0001 ///< Decoder can use draw_horiz_band callback.
601 * Codec uses get_buffer() for allocating buffers and supports custom allocators.
602 * If not set, it might not use get_buffer() at all or use operations that
603 * assume the buffer was allocated by avcodec_default_get_buffer.
605 #define CODEC_CAP_DR1 0x0002
606 #define CODEC_CAP_TRUNCATED 0x0008
607 /* Codec can export data for HW decoding (XvMC). */
608 #define CODEC_CAP_HWACCEL 0x0010
610 * Encoder or decoder requires flushing with NULL input at the end in order to
611 * give the complete and correct output.
613 * NOTE: If this flag is not set, the codec is guaranteed to never be fed with
614 * with NULL data. The user can still send NULL data to the public encode
615 * or decode function, but libavcodec will not pass it along to the codec
616 * unless this flag is set.
619 * The decoder has a non-zero delay and needs to be fed with avpkt->data=NULL,
620 * avpkt->size=0 at the end to get the delayed data until the decoder no longer
624 * The encoder needs to be fed with NULL data at the end of encoding until the
625 * encoder no longer returns data.
627 * NOTE: For encoders implementing the AVCodec.encode2() function, setting this
628 * flag also means that the encoder must set the pts and duration for
629 * each output packet. If this flag is not set, the pts and duration will
630 * be determined by libavcodec from the input frame.
632 #define CODEC_CAP_DELAY 0x0020
634 * Codec can be fed a final frame with a smaller size.
635 * This can be used to prevent truncation of the last audio samples.
637 #define CODEC_CAP_SMALL_LAST_FRAME 0x0040
639 * Codec can export data for HW decoding (VDPAU).
641 #define CODEC_CAP_HWACCEL_VDPAU 0x0080
643 * Codec can output multiple frames per AVPacket
644 * Normally demuxers return one frame at a time, demuxers which do not do
645 * are connected to a parser to split what they return into proper frames.
646 * This flag is reserved to the very rare category of codecs which have a
647 * bitstream that cannot be split into frames without timeconsuming
648 * operations like full decoding. Demuxers carring such bitstreams thus
649 * may return multiple frames in a packet. This has many disadvantages like
650 * prohibiting stream copy in many cases thus it should only be considered
653 #define CODEC_CAP_SUBFRAMES 0x0100
655 * Codec is experimental and is thus avoided in favor of non experimental
658 #define CODEC_CAP_EXPERIMENTAL 0x0200
660 * Codec should fill in channel configuration and samplerate instead of container
662 #define CODEC_CAP_CHANNEL_CONF 0x0400
664 * Codec is able to deal with negative linesizes
666 #define CODEC_CAP_NEG_LINESIZES 0x0800
668 * Codec supports frame-level multithreading.
670 #define CODEC_CAP_FRAME_THREADS 0x1000
672 * Codec supports slice-based (or partition-based) multithreading.
674 #define CODEC_CAP_SLICE_THREADS 0x2000
676 * Codec supports changed parameters at any point.
678 #define CODEC_CAP_PARAM_CHANGE 0x4000
680 * Codec supports avctx->thread_count == 0 (auto).
682 #define CODEC_CAP_AUTO_THREADS 0x8000
684 * Audio encoder supports receiving a different number of samples in each call.
686 #define CODEC_CAP_VARIABLE_FRAME_SIZE 0x10000
688 //The following defines may change, don't expect compatibility if you use them.
689 #define MB_TYPE_INTRA4x4 0x0001
690 #define MB_TYPE_INTRA16x16 0x0002 //FIXME H.264-specific
691 #define MB_TYPE_INTRA_PCM 0x0004 //FIXME H.264-specific
692 #define MB_TYPE_16x16 0x0008
693 #define MB_TYPE_16x8 0x0010
694 #define MB_TYPE_8x16 0x0020
695 #define MB_TYPE_8x8 0x0040
696 #define MB_TYPE_INTERLACED 0x0080
697 #define MB_TYPE_DIRECT2 0x0100 //FIXME
698 #define MB_TYPE_ACPRED 0x0200
699 #define MB_TYPE_GMC 0x0400
700 #define MB_TYPE_SKIP 0x0800
701 #define MB_TYPE_P0L0 0x1000
702 #define MB_TYPE_P1L0 0x2000
703 #define MB_TYPE_P0L1 0x4000
704 #define MB_TYPE_P1L1 0x8000
705 #define MB_TYPE_L0 (MB_TYPE_P0L0 | MB_TYPE_P1L0)
706 #define MB_TYPE_L1 (MB_TYPE_P0L1 | MB_TYPE_P1L1)
707 #define MB_TYPE_L0L1 (MB_TYPE_L0 | MB_TYPE_L1)
708 #define MB_TYPE_QUANT 0x00010000
709 #define MB_TYPE_CBP 0x00020000
710 //Note bits 24-31 are reserved for codec specific use (h264 ref0, mpeg1 0mv, ...)
714 * This specifies the area which should be displayed.
715 * Note there may be multiple such areas for one frame.
717 typedef struct AVPanScan{
720 * - encoding: Set by user.
721 * - decoding: Set by libavcodec.
726 * width and height in 1/16 pel
727 * - encoding: Set by user.
728 * - decoding: Set by libavcodec.
734 * position of the top left corner in 1/16 pel for up to 3 fields/frames
735 * - encoding: Set by user.
736 * - decoding: Set by libavcodec.
738 int16_t position[3][2];
741 #define FF_QSCALE_TYPE_MPEG1 0
742 #define FF_QSCALE_TYPE_MPEG2 1
743 #define FF_QSCALE_TYPE_H264 2
744 #define FF_QSCALE_TYPE_VP56 3
746 #define FF_BUFFER_TYPE_INTERNAL 1
747 #define FF_BUFFER_TYPE_USER 2 ///< direct rendering buffers (image is (de)allocated by user)
748 #define FF_BUFFER_TYPE_SHARED 4 ///< Buffer from somewhere else; don't deallocate image (data/base), all other tables are not shared.
749 #define FF_BUFFER_TYPE_COPY 8 ///< Just a (modified) copy of some other buffer, don't deallocate anything.
751 #define FF_BUFFER_HINTS_VALID 0x01 // Buffer hints value is meaningful (if 0 ignore).
752 #define FF_BUFFER_HINTS_READABLE 0x02 // Codec will read from buffer.
753 #define FF_BUFFER_HINTS_PRESERVE 0x04 // User must not alter buffer content.
754 #define FF_BUFFER_HINTS_REUSABLE 0x08 // Codec will reuse the buffer (update).
756 enum AVPacketSideDataType {
758 AV_PKT_DATA_NEW_EXTRADATA,
759 AV_PKT_DATA_PARAM_CHANGE,
762 typedef struct AVPacket {
764 * Presentation timestamp in AVStream->time_base units; the time at which
765 * the decompressed packet will be presented to the user.
766 * Can be AV_NOPTS_VALUE if it is not stored in the file.
767 * pts MUST be larger or equal to dts as presentation cannot happen before
768 * decompression, unless one wants to view hex dumps. Some formats misuse
769 * the terms dts and pts/cts to mean something different. Such timestamps
770 * must be converted to true pts/dts before they are stored in AVPacket.
774 * Decompression timestamp in AVStream->time_base units; the time at which
775 * the packet is decompressed.
776 * Can be AV_NOPTS_VALUE if it is not stored in the file.
783 * A combination of AV_PKT_FLAG values
787 * Additional packet data that can be provided by the container.
788 * Packet can contain several types of side information.
793 enum AVPacketSideDataType type;
798 * Duration of this packet in AVStream->time_base units, 0 if unknown.
799 * Equals next_pts - this_pts in presentation order.
802 void (*destruct)(struct AVPacket *);
804 int64_t pos; ///< byte position in stream, -1 if unknown
807 * Time difference in AVStream->time_base units from the pts of this
808 * packet to the point at which the output from the decoder has converged
809 * independent from the availability of previous frames. That is, the
810 * frames are virtually identical no matter if decoding started from
811 * the very first frame or from this keyframe.
812 * Is AV_NOPTS_VALUE if unknown.
813 * This field is not the display duration of the current packet.
814 * This field has no meaning if the packet does not have AV_PKT_FLAG_KEY
817 * The purpose of this field is to allow seeking in streams that have no
818 * keyframes in the conventional sense. It corresponds to the
819 * recovery point SEI in H.264 and match_time_delta in NUT. It is also
820 * essential for some types of subtitle streams to ensure that all
821 * subtitles are correctly displayed after seeking.
823 int64_t convergence_duration;
825 #define AV_PKT_FLAG_KEY 0x0001 ///< The packet contains a keyframe
826 #define AV_PKT_FLAG_CORRUPT 0x0002 ///< The packet content is corrupted
829 * An AV_PKT_DATA_PARAM_CHANGE side data packet is laid out as follows:
831 * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_COUNT)
832 * s32le channel_count
833 * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_LAYOUT)
834 * u64le channel_layout
835 * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_SAMPLE_RATE)
837 * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_DIMENSIONS)
842 enum AVSideDataParamChangeFlags {
843 AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_COUNT = 0x0001,
844 AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_LAYOUT = 0x0002,
845 AV_SIDE_DATA_PARAM_CHANGE_SAMPLE_RATE = 0x0004,
846 AV_SIDE_DATA_PARAM_CHANGE_DIMENSIONS = 0x0008,
851 * New fields can be added to the end of AVFRAME with minor version
852 * bumps. Removal, reordering and changes to existing fields require
853 * a major version bump.
854 * sizeof(AVFrame) must not be used outside libav*.
856 typedef struct AVFrame {
857 #define AV_NUM_DATA_POINTERS 8
859 * pointer to the picture/channel planes.
860 * This might be different from the first allocated byte
861 * - encoding: Set by user
862 * - decoding: set by AVCodecContext.get_buffer()
864 uint8_t *data[AV_NUM_DATA_POINTERS];
867 * Size, in bytes, of the data for each picture/channel plane.
869 * For audio, only linesize[0] may be set. For planar audio, each channel
870 * plane must be the same size.
872 * - encoding: Set by user (video only)
873 * - decoding: set by AVCodecContext.get_buffer()
875 int linesize[AV_NUM_DATA_POINTERS];
878 * pointer to the first allocated byte of the picture. Can be used in get_buffer/release_buffer.
879 * This isn't used by libavcodec unless the default get/release_buffer() is used.
883 uint8_t *base[AV_NUM_DATA_POINTERS];
885 * 1 -> keyframe, 0-> not
886 * - encoding: Set by libavcodec.
887 * - decoding: Set by libavcodec.
892 * Picture type of the frame, see ?_TYPE below.
893 * - encoding: Set by libavcodec. for coded_picture (and set by user for input).
894 * - decoding: Set by libavcodec.
896 enum AVPictureType pict_type;
899 * presentation timestamp in time_base units (time when frame should be shown to user)
900 * If AV_NOPTS_VALUE then frame_rate = 1/time_base will be assumed.
901 * - encoding: MUST be set by user.
902 * - decoding: Set by libavcodec.
907 * picture number in bitstream order
909 * - decoding: Set by libavcodec.
911 int coded_picture_number;
913 * picture number in display order
915 * - decoding: Set by libavcodec.
917 int display_picture_number;
920 * quality (between 1 (good) and FF_LAMBDA_MAX (bad))
921 * - encoding: Set by libavcodec. for coded_picture (and set by user for input).
922 * - decoding: Set by libavcodec.
926 #if FF_API_AVFRAME_AGE
930 attribute_deprecated int age;
934 * is this picture used as reference
935 * The values for this are the same as the MpegEncContext.picture_structure
936 * variable, that is 1->top field, 2->bottom field, 3->frame/both fields.
937 * Set to 4 for delayed, non-reference frames.
939 * - decoding: Set by libavcodec. (before get_buffer() call)).
946 * - decoding: Set by libavcodec.
948 int8_t *qscale_table;
952 * - decoding: Set by libavcodec.
957 * mbskip_table[mb]>=1 if MB didn't change
958 * stride= mb_width = (width+15)>>4
960 * - decoding: Set by libavcodec.
962 uint8_t *mbskip_table;
965 * motion vector table
968 * int mv_sample_log2= 4 - motion_subsample_log2;
969 * int mb_width= (width+15)>>4;
970 * int mv_stride= (mb_width << mv_sample_log2) + 1;
971 * motion_val[direction][x + y*mv_stride][0->mv_x, 1->mv_y];
973 * - encoding: Set by user.
974 * - decoding: Set by libavcodec.
976 int16_t (*motion_val[2])[2];
979 * macroblock type table
980 * mb_type_base + mb_width + 2
981 * - encoding: Set by user.
982 * - decoding: Set by libavcodec.
987 * log2 of the size of the block which a single vector in motion_val represents:
988 * (4->16x16, 3->8x8, 2-> 4x4, 1-> 2x2)
990 * - decoding: Set by libavcodec.
992 uint8_t motion_subsample_log2;
995 * for some private data of the user
997 * - decoding: Set by user.
1003 * - encoding: Set by libavcodec. if flags&CODEC_FLAG_PSNR.
1004 * - decoding: unused
1006 uint64_t error[AV_NUM_DATA_POINTERS];
1009 * type of the buffer (to keep track of who has to deallocate data[*])
1010 * - encoding: Set by the one who allocates it.
1011 * - decoding: Set by the one who allocates it.
1012 * Note: User allocated (direct rendering) & internal buffers cannot coexist currently.
1017 * When decoding, this signals how much the picture must be delayed.
1018 * extra_delay = repeat_pict / (2*fps)
1019 * - encoding: unused
1020 * - decoding: Set by libavcodec.
1030 * The content of the picture is interlaced.
1031 * - encoding: Set by user.
1032 * - decoding: Set by libavcodec. (default 0)
1034 int interlaced_frame;
1037 * If the content is interlaced, is top field displayed first.
1038 * - encoding: Set by user.
1039 * - decoding: Set by libavcodec.
1041 int top_field_first;
1045 * - encoding: Set by user.
1046 * - decoding: Set by libavcodec.
1048 AVPanScan *pan_scan;
1051 * Tell user application that palette has changed from previous frame.
1052 * - encoding: ??? (no palette-enabled encoder yet)
1053 * - decoding: Set by libavcodec. (default 0).
1055 int palette_has_changed;
1058 * codec suggestion on buffer type if != 0
1059 * - encoding: unused
1060 * - decoding: Set by libavcodec. (before get_buffer() call)).
1066 * - encoding: unused
1067 * - decoding: Set by libavcodec.
1072 * motion reference frame index
1073 * the order in which these are stored can depend on the codec.
1074 * - encoding: Set by user.
1075 * - decoding: Set by libavcodec.
1077 int8_t *ref_index[2];
1080 * reordered opaque 64bit (generally an integer or a double precision float
1081 * PTS but can be anything).
1082 * The user sets AVCodecContext.reordered_opaque to represent the input at
1084 * the decoder reorders values as needed and sets AVFrame.reordered_opaque
1085 * to exactly one of the values provided by the user through AVCodecContext.reordered_opaque
1086 * @deprecated in favor of pkt_pts
1087 * - encoding: unused
1088 * - decoding: Read by user.
1090 int64_t reordered_opaque;
1093 * hardware accelerator private data (Libav-allocated)
1094 * - encoding: unused
1095 * - decoding: Set by libavcodec
1097 void *hwaccel_picture_private;
1100 * reordered pts from the last AVPacket that has been input into the decoder
1101 * - encoding: unused
1102 * - decoding: Read by user.
1107 * dts from the last AVPacket that has been input into the decoder
1108 * - encoding: unused
1109 * - decoding: Read by user.
1114 * the AVCodecContext which ff_thread_get_buffer() was last called on
1115 * - encoding: Set by libavcodec.
1116 * - decoding: Set by libavcodec.
1118 struct AVCodecContext *owner;
1121 * used by multithreading to store frame-specific info
1122 * - encoding: Set by libavcodec.
1123 * - decoding: Set by libavcodec.
1125 void *thread_opaque;
1128 * number of audio samples (per channel) described by this frame
1129 * - encoding: unused
1130 * - decoding: Set by libavcodec
1135 * pointers to the data planes/channels.
1137 * For video, this should simply point to data[].
1139 * For planar audio, each channel has a separate data pointer, and
1140 * linesize[0] contains the size of each channel buffer.
1141 * For packed audio, there is just one data pointer, and linesize[0]
1142 * contains the total size of the buffer for all channels.
1144 * Note: Both data and extended_data will always be set by get_buffer(),
1145 * but for planar audio with more channels that can fit in data,
1146 * extended_data must be used by the decoder in order to access all
1150 * decoding: set by AVCodecContext.get_buffer()
1152 uint8_t **extended_data;
1155 * sample aspect ratio for the video frame, 0/1 if unknown\unspecified
1156 * - encoding: unused
1157 * - decoding: Read by user.
1159 AVRational sample_aspect_ratio;
1162 * width and height of the video frame
1163 * - encoding: unused
1164 * - decoding: Read by user.
1169 * format of the frame, -1 if unknown or unset
1170 * Values correspond to enum PixelFormat for video frames,
1171 * enum AVSampleFormat for audio)
1172 * - encoding: unused
1173 * - decoding: Read by user.
1178 struct AVCodecInternal;
1182 AV_FIELD_PROGRESSIVE,
1183 AV_FIELD_TT, //< Top coded_first, top displayed first
1184 AV_FIELD_BB, //< Bottom coded first, bottom displayed first
1185 AV_FIELD_TB, //< Top coded first, bottom displayed first
1186 AV_FIELD_BT, //< Bottom coded first, top displayed first
1190 * main external API structure.
1191 * New fields can be added to the end with minor version bumps.
1192 * Removal, reordering and changes to existing fields require a major
1194 * sizeof(AVCodecContext) must not be used outside libav*.
1196 typedef struct AVCodecContext {
1198 * information on struct for av_log
1199 * - set by avcodec_alloc_context3
1201 const AVClass *av_class;
1203 * the average bitrate
1204 * - encoding: Set by user; unused for constant quantizer encoding.
1205 * - decoding: Set by libavcodec. 0 or some bitrate if this info is available in the stream.
1210 * number of bits the bitstream is allowed to diverge from the reference.
1211 * the reference can be CBR (for CBR pass1) or VBR (for pass2)
1212 * - encoding: Set by user; unused for constant quantizer encoding.
1213 * - decoding: unused
1215 int bit_rate_tolerance;
1219 * - encoding: Set by user.
1220 * - decoding: Set by user.
1225 * Some codecs need additional format info. It is stored here.
1226 * If any muxer uses this then ALL demuxers/parsers AND encoders for the
1227 * specific codec MUST set it correctly otherwise stream copy breaks.
1228 * In general use of this field by muxers is not recommended.
1229 * - encoding: Set by libavcodec.
1230 * - decoding: Set by libavcodec. (FIXME: Is this OK?)
1235 * Motion estimation algorithm used for video coding.
1236 * 1 (zero), 2 (full), 3 (log), 4 (phods), 5 (epzs), 6 (x1), 7 (hex),
1237 * 8 (umh), 9 (iter), 10 (tesa) [7, 8, 10 are x264 specific, 9 is snow specific]
1238 * - encoding: MUST be set by user.
1239 * - decoding: unused
1244 * some codecs need / can use extradata like Huffman tables.
1245 * mjpeg: Huffman tables
1246 * rv10: additional flags
1247 * mpeg4: global headers (they can be in the bitstream or here)
1248 * The allocated memory should be FF_INPUT_BUFFER_PADDING_SIZE bytes larger
1249 * than extradata_size to avoid prolems if it is read with the bitstream reader.
1250 * The bytewise contents of extradata must not depend on the architecture or CPU endianness.
1251 * - encoding: Set/allocated/freed by libavcodec.
1252 * - decoding: Set/allocated/freed by user.
1258 * This is the fundamental unit of time (in seconds) in terms
1259 * of which frame timestamps are represented. For fixed-fps content,
1260 * timebase should be 1/framerate and timestamp increments should be
1262 * - encoding: MUST be set by user.
1263 * - decoding: Set by libavcodec.
1265 AVRational time_base;
1269 * picture width / height.
1270 * - encoding: MUST be set by user.
1271 * - decoding: Set by libavcodec.
1272 * Note: For compatibility it is possible to set this instead of
1273 * coded_width/height before decoding.
1277 #define FF_ASPECT_EXTENDED 15
1280 * the number of pictures in a group of pictures, or 0 for intra_only
1281 * - encoding: Set by user.
1282 * - decoding: unused
1287 * Pixel format, see PIX_FMT_xxx.
1288 * May be set by the demuxer if known from headers.
1289 * May be overriden by the decoder if it knows better.
1290 * - encoding: Set by user.
1291 * - decoding: Set by user if known, overridden by libavcodec if known
1293 enum PixelFormat pix_fmt;
1296 * If non NULL, 'draw_horiz_band' is called by the libavcodec
1297 * decoder to draw a horizontal band. It improves cache usage. Not
1298 * all codecs can do that. You must check the codec capabilities
1300 * When multithreading is used, it may be called from multiple threads
1301 * at the same time; threads might draw different parts of the same AVFrame,
1302 * or multiple AVFrames, and there is no guarantee that slices will be drawn
1304 * The function is also used by hardware acceleration APIs.
1305 * It is called at least once during frame decoding to pass
1306 * the data needed for hardware render.
1307 * In that mode instead of pixel data, AVFrame points to
1308 * a structure specific to the acceleration API. The application
1309 * reads the structure and can change some fields to indicate progress
1311 * - encoding: unused
1312 * - decoding: Set by user.
1313 * @param height the height of the slice
1314 * @param y the y position of the slice
1315 * @param type 1->top field, 2->bottom field, 3->frame
1316 * @param offset offset into the AVFrame.data from which the slice should be read
1318 void (*draw_horiz_band)(struct AVCodecContext *s,
1319 const AVFrame *src, int offset[AV_NUM_DATA_POINTERS],
1320 int y, int type, int height);
1323 int sample_rate; ///< samples per second
1324 int channels; ///< number of audio channels
1327 * audio sample format
1328 * - encoding: Set by user.
1329 * - decoding: Set by libavcodec.
1331 enum AVSampleFormat sample_fmt; ///< sample format
1333 /* The following data should not be initialized. */
1335 * Samples per packet, initialized when calling 'init'.
1338 int frame_number; ///< audio or video frame number
1341 * Number of frames the decoded output will be delayed relative to
1342 * the encoded input.
1343 * - encoding: Set by libavcodec.
1344 * - decoding: unused
1348 /* - encoding parameters */
1349 float qcompress; ///< amount of qscale change between easy & hard scenes (0.0-1.0)
1350 float qblur; ///< amount of qscale smoothing over time (0.0-1.0)
1354 * - encoding: Set by user.
1355 * - decoding: unused
1361 * - encoding: Set by user.
1362 * - decoding: unused
1367 * maximum quantizer difference between frames
1368 * - encoding: Set by user.
1369 * - decoding: unused
1374 * maximum number of B-frames between non-B-frames
1375 * Note: The output will be delayed by max_b_frames+1 relative to the input.
1376 * - encoding: Set by user.
1377 * - decoding: unused
1382 * qscale factor between IP and B-frames
1383 * If > 0 then the last P-frame quantizer will be used (q= lastp_q*factor+offset).
1384 * If < 0 then normal ratecontrol will be done (q= -normal_q*factor+offset).
1385 * - encoding: Set by user.
1386 * - decoding: unused
1388 float b_quant_factor;
1390 /** obsolete FIXME remove */
1392 #define FF_RC_STRATEGY_XVID 1
1394 int b_frame_strategy;
1396 struct AVCodec *codec;
1400 int rtp_payload_size; /* The size of the RTP payload: the coder will */
1401 /* do its best to deliver a chunk with size */
1402 /* below rtp_payload_size, the chunk will start */
1403 /* with a start code on some codecs like H.263. */
1404 /* This doesn't take account of any particular */
1405 /* headers inside the transmitted RTP payload. */
1408 /* The RTP callback: This function is called */
1409 /* every time the encoder has a packet to send. */
1410 /* It depends on the encoder if the data starts */
1411 /* with a Start Code (it should). H.263 does. */
1412 /* mb_nb contains the number of macroblocks */
1413 /* encoded in the RTP payload. */
1414 void (*rtp_callback)(struct AVCodecContext *avctx, void *data, int size, int mb_nb);
1416 /* statistics, used for 2-pass encoding */
1427 * number of bits used for the previously encoded frame
1428 * - encoding: Set by libavcodec.
1429 * - decoding: unused
1434 * Private data of the user, can be used to carry app specific stuff.
1435 * - encoding: Set by user.
1436 * - decoding: Set by user.
1440 char codec_name[32];
1441 enum AVMediaType codec_type; /* see AVMEDIA_TYPE_xxx */
1442 enum CodecID codec_id; /* see CODEC_ID_xxx */
1445 * fourcc (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A').
1446 * This is used to work around some encoder bugs.
1447 * A demuxer should set this to what is stored in the field used to identify the codec.
1448 * If there are multiple such fields in a container then the demuxer should choose the one
1449 * which maximizes the information about the used codec.
1450 * If the codec tag field in a container is larger than 32 bits then the demuxer should
1451 * remap the longer ID to 32 bits with a table or other structure. Alternatively a new
1452 * extra_codec_tag + size could be added but for this a clear advantage must be demonstrated
1454 * - encoding: Set by user, if not then the default based on codec_id will be used.
1455 * - decoding: Set by user, will be converted to uppercase by libavcodec during init.
1457 unsigned int codec_tag;
1460 * Work around bugs in encoders which sometimes cannot be detected automatically.
1461 * - encoding: Set by user
1462 * - decoding: Set by user
1464 int workaround_bugs;
1465 #define FF_BUG_AUTODETECT 1 ///< autodetection
1466 #define FF_BUG_OLD_MSMPEG4 2
1467 #define FF_BUG_XVID_ILACE 4
1468 #define FF_BUG_UMP4 8
1469 #define FF_BUG_NO_PADDING 16
1470 #define FF_BUG_AMV 32
1471 #define FF_BUG_AC_VLC 0 ///< Will be removed, libavcodec can now handle these non-compliant files by default.
1472 #define FF_BUG_QPEL_CHROMA 64
1473 #define FF_BUG_STD_QPEL 128
1474 #define FF_BUG_QPEL_CHROMA2 256
1475 #define FF_BUG_DIRECT_BLOCKSIZE 512
1476 #define FF_BUG_EDGE 1024
1477 #define FF_BUG_HPEL_CHROMA 2048
1478 #define FF_BUG_DC_CLIP 4096
1479 #define FF_BUG_MS 8192 ///< Work around various bugs in Microsoft's broken decoders.
1480 #define FF_BUG_TRUNCATED 16384
1481 //#define FF_BUG_FAKE_SCALABILITY 16 //Autodetection should work 100%.
1484 * luma single coefficient elimination threshold
1485 * - encoding: Set by user.
1486 * - decoding: unused
1488 int luma_elim_threshold;
1491 * chroma single coeff elimination threshold
1492 * - encoding: Set by user.
1493 * - decoding: unused
1495 int chroma_elim_threshold;
1498 * strictly follow the standard (MPEG4, ...).
1499 * - encoding: Set by user.
1500 * - decoding: Set by user.
1501 * Setting this to STRICT or higher means the encoder and decoder will
1502 * generally do stupid things, whereas setting it to unofficial or lower
1503 * will mean the encoder might produce output that is not supported by all
1504 * spec-compliant decoders. Decoders don't differentiate between normal,
1505 * unofficial and experimental (that is, they always try to decode things
1506 * when they can) unless they are explicitly asked to behave stupidly
1507 * (=strictly conform to the specs)
1509 int strict_std_compliance;
1510 #define FF_COMPLIANCE_VERY_STRICT 2 ///< Strictly conform to an older more strict version of the spec or reference software.
1511 #define FF_COMPLIANCE_STRICT 1 ///< Strictly conform to all the things in the spec no matter what consequences.
1512 #define FF_COMPLIANCE_NORMAL 0
1513 #define FF_COMPLIANCE_UNOFFICIAL -1 ///< Allow unofficial extensions
1514 #define FF_COMPLIANCE_EXPERIMENTAL -2 ///< Allow nonstandardized experimental things.
1517 * qscale offset between IP and B-frames
1518 * - encoding: Set by user.
1519 * - decoding: unused
1521 float b_quant_offset;
1524 * Called at the beginning of each frame to get a buffer for it.
1526 * The function will set AVFrame.data[], AVFrame.linesize[].
1527 * AVFrame.extended_data[] must also be set, but it should be the same as
1528 * AVFrame.data[] except for planar audio with more channels than can fit
1529 * in AVFrame.data[]. In that case, AVFrame.data[] shall still contain as
1530 * many data pointers as it can hold.
1532 * if CODEC_CAP_DR1 is not set then get_buffer() must call
1533 * avcodec_default_get_buffer() instead of providing buffers allocated by
1536 * AVFrame.data[] should be 32- or 16-byte-aligned unless the CPU doesn't
1537 * need it. avcodec_default_get_buffer() aligns the output buffer properly,
1538 * but if get_buffer() is overridden then alignment considerations should
1539 * be taken into account.
1541 * @see avcodec_default_get_buffer()
1545 * If pic.reference is set then the frame will be read later by libavcodec.
1546 * avcodec_align_dimensions2() should be used to find the required width and
1547 * height, as they normally need to be rounded up to the next multiple of 16.
1549 * If frame multithreading is used and thread_safe_callbacks is set,
1550 * it may be called from a different thread, but not from more than one at
1551 * once. Does not need to be reentrant.
1553 * @see release_buffer(), reget_buffer()
1554 * @see avcodec_align_dimensions2()
1558 * Decoders request a buffer of a particular size by setting
1559 * AVFrame.nb_samples prior to calling get_buffer(). The decoder may,
1560 * however, utilize only part of the buffer by setting AVFrame.nb_samples
1561 * to a smaller value in the output frame.
1563 * Decoders cannot use the buffer after returning from
1564 * avcodec_decode_audio4(), so they will not call release_buffer(), as it
1565 * is assumed to be released immediately upon return.
1567 * As a convenience, av_samples_get_buffer_size() and
1568 * av_samples_fill_arrays() in libavutil may be used by custom get_buffer()
1569 * functions to find the required data size and to fill data pointers and
1570 * linesize. In AVFrame.linesize, only linesize[0] may be set for audio
1571 * since all planes must be the same size.
1573 * @see av_samples_get_buffer_size(), av_samples_fill_arrays()
1575 * - encoding: unused
1576 * - decoding: Set by libavcodec, user can override.
1578 int (*get_buffer)(struct AVCodecContext *c, AVFrame *pic);
1581 * Called to release buffers which were allocated with get_buffer.
1582 * A released buffer can be reused in get_buffer().
1583 * pic.data[*] must be set to NULL.
1584 * May be called from a different thread if frame multithreading is used,
1585 * but not by more than one thread at once, so does not need to be reentrant.
1586 * - encoding: unused
1587 * - decoding: Set by libavcodec, user can override.
1589 void (*release_buffer)(struct AVCodecContext *c, AVFrame *pic);
1592 * Size of the frame reordering buffer in the decoder.
1593 * For MPEG-2 it is 1 IPB or 0 low delay IP.
1594 * - encoding: Set by libavcodec.
1595 * - decoding: Set by libavcodec.
1600 * number of bytes per packet if constant and known or 0
1601 * Used by some WAV based audio codecs.
1606 * 0-> h263 quant 1-> mpeg quant
1607 * - encoding: Set by user.
1608 * - decoding: unused
1613 * pass1 encoding statistics output buffer
1614 * - encoding: Set by libavcodec.
1615 * - decoding: unused
1620 * pass2 encoding statistics input buffer
1621 * Concatenated stuff from stats_out of pass1 should be placed here.
1622 * - encoding: Allocated/set/freed by user.
1623 * - decoding: unused
1628 * ratecontrol qmin qmax limiting method
1629 * 0-> clipping, 1-> use a nice continous function to limit qscale wthin qmin/qmax.
1630 * - encoding: Set by user.
1631 * - decoding: unused
1639 * ratecontrol override, see RcOverride
1640 * - encoding: Allocated/set/freed by user.
1641 * - decoding: unused
1643 RcOverride *rc_override;
1644 int rc_override_count;
1647 * rate control equation
1648 * - encoding: Set by user
1649 * - decoding: unused
1655 * - encoding: Set by user.
1656 * - decoding: unused
1662 * - encoding: Set by user.
1663 * - decoding: unused
1668 * decoder bitstream buffer size
1669 * - encoding: Set by user.
1670 * - decoding: unused
1673 float rc_buffer_aggressivity;
1676 * qscale factor between P and I-frames
1677 * If > 0 then the last p frame quantizer will be used (q= lastp_q*factor+offset).
1678 * If < 0 then normal ratecontrol will be done (q= -normal_q*factor+offset).
1679 * - encoding: Set by user.
1680 * - decoding: unused
1682 float i_quant_factor;
1685 * qscale offset between P and I-frames
1686 * - encoding: Set by user.
1687 * - decoding: unused
1689 float i_quant_offset;
1692 * initial complexity for pass1 ratecontrol
1693 * - encoding: Set by user.
1694 * - decoding: unused
1696 float rc_initial_cplx;
1699 * DCT algorithm, see FF_DCT_* below
1700 * - encoding: Set by user.
1701 * - decoding: unused
1704 #define FF_DCT_AUTO 0
1705 #define FF_DCT_FASTINT 1
1706 #define FF_DCT_INT 2
1707 #define FF_DCT_MMX 3
1708 #define FF_DCT_MLIB 4
1709 #define FF_DCT_ALTIVEC 5
1710 #define FF_DCT_FAAN 6
1713 * luminance masking (0-> disabled)
1714 * - encoding: Set by user.
1715 * - decoding: unused
1720 * temporary complexity masking (0-> disabled)
1721 * - encoding: Set by user.
1722 * - decoding: unused
1724 float temporal_cplx_masking;
1727 * spatial complexity masking (0-> disabled)
1728 * - encoding: Set by user.
1729 * - decoding: unused
1731 float spatial_cplx_masking;
1734 * p block masking (0-> disabled)
1735 * - encoding: Set by user.
1736 * - decoding: unused
1741 * darkness masking (0-> disabled)
1742 * - encoding: Set by user.
1743 * - decoding: unused
1748 * IDCT algorithm, see FF_IDCT_* below.
1749 * - encoding: Set by user.
1750 * - decoding: Set by user.
1753 #define FF_IDCT_AUTO 0
1754 #define FF_IDCT_INT 1
1755 #define FF_IDCT_SIMPLE 2
1756 #define FF_IDCT_SIMPLEMMX 3
1757 #define FF_IDCT_LIBMPEG2MMX 4
1758 #define FF_IDCT_PS2 5
1759 #define FF_IDCT_MLIB 6
1760 #define FF_IDCT_ARM 7
1761 #define FF_IDCT_ALTIVEC 8
1762 #define FF_IDCT_SH4 9
1763 #define FF_IDCT_SIMPLEARM 10
1764 #define FF_IDCT_H264 11
1765 #define FF_IDCT_VP3 12
1766 #define FF_IDCT_IPP 13
1767 #define FF_IDCT_XVIDMMX 14
1768 #define FF_IDCT_CAVS 15
1769 #define FF_IDCT_SIMPLEARMV5TE 16
1770 #define FF_IDCT_SIMPLEARMV6 17
1771 #define FF_IDCT_SIMPLEVIS 18
1772 #define FF_IDCT_WMV2 19
1773 #define FF_IDCT_FAAN 20
1774 #define FF_IDCT_EA 21
1775 #define FF_IDCT_SIMPLENEON 22
1776 #define FF_IDCT_SIMPLEALPHA 23
1777 #define FF_IDCT_BINK 24
1781 * - encoding: Set by libavcodec.
1782 * - decoding: Set by user (or 0).
1786 * slice offsets in the frame in bytes
1787 * - encoding: Set/allocated by libavcodec.
1788 * - decoding: Set/allocated by user (or NULL).
1793 * error concealment flags
1794 * - encoding: unused
1795 * - decoding: Set by user.
1797 int error_concealment;
1798 #define FF_EC_GUESS_MVS 1
1799 #define FF_EC_DEBLOCK 2
1802 * dsp_mask could be add used to disable unwanted CPU features
1803 * CPU features (i.e. MMX, SSE. ...)
1805 * With the FORCE flag you may instead enable given CPU features.
1806 * (Dangerous: Usable in case of misdetection, improper usage however will
1807 * result into program crash.)
1812 * bits per sample/pixel from the demuxer (needed for huffyuv).
1813 * - encoding: Set by libavcodec.
1814 * - decoding: Set by user.
1816 int bits_per_coded_sample;
1819 * prediction method (needed for huffyuv)
1820 * - encoding: Set by user.
1821 * - decoding: unused
1823 int prediction_method;
1824 #define FF_PRED_LEFT 0
1825 #define FF_PRED_PLANE 1
1826 #define FF_PRED_MEDIAN 2
1829 * sample aspect ratio (0 if unknown)
1830 * That is the width of a pixel divided by the height of the pixel.
1831 * Numerator and denominator must be relatively prime and smaller than 256 for some video standards.
1832 * - encoding: Set by user.
1833 * - decoding: Set by libavcodec.
1835 AVRational sample_aspect_ratio;
1838 * the picture in the bitstream
1839 * - encoding: Set by libavcodec.
1840 * - decoding: Set by libavcodec.
1842 AVFrame *coded_frame;
1846 * - encoding: Set by user.
1847 * - decoding: Set by user.
1850 #define FF_DEBUG_PICT_INFO 1
1851 #define FF_DEBUG_RC 2
1852 #define FF_DEBUG_BITSTREAM 4
1853 #define FF_DEBUG_MB_TYPE 8
1854 #define FF_DEBUG_QP 16
1855 #define FF_DEBUG_MV 32
1856 #define FF_DEBUG_DCT_COEFF 0x00000040
1857 #define FF_DEBUG_SKIP 0x00000080
1858 #define FF_DEBUG_STARTCODE 0x00000100
1859 #define FF_DEBUG_PTS 0x00000200
1860 #define FF_DEBUG_ER 0x00000400
1861 #define FF_DEBUG_MMCO 0x00000800
1862 #define FF_DEBUG_BUGS 0x00001000
1863 #define FF_DEBUG_VIS_QP 0x00002000
1864 #define FF_DEBUG_VIS_MB_TYPE 0x00004000
1865 #define FF_DEBUG_BUFFERS 0x00008000
1866 #define FF_DEBUG_THREADS 0x00010000
1870 * - encoding: Set by user.
1871 * - decoding: Set by user.
1874 #define FF_DEBUG_VIS_MV_P_FOR 0x00000001 //visualize forward predicted MVs of P frames
1875 #define FF_DEBUG_VIS_MV_B_FOR 0x00000002 //visualize forward predicted MVs of B frames
1876 #define FF_DEBUG_VIS_MV_B_BACK 0x00000004 //visualize backward predicted MVs of B frames
1880 * - encoding: Set by libavcodec if flags&CODEC_FLAG_PSNR.
1881 * - decoding: unused
1883 uint64_t error[AV_NUM_DATA_POINTERS];
1886 * motion estimation comparison function
1887 * - encoding: Set by user.
1888 * - decoding: unused
1892 * subpixel motion estimation comparison function
1893 * - encoding: Set by user.
1894 * - decoding: unused
1898 * macroblock comparison function (not supported yet)
1899 * - encoding: Set by user.
1900 * - decoding: unused
1904 * interlaced DCT comparison function
1905 * - encoding: Set by user.
1906 * - decoding: unused
1909 #define FF_CMP_SAD 0
1910 #define FF_CMP_SSE 1
1911 #define FF_CMP_SATD 2
1912 #define FF_CMP_DCT 3
1913 #define FF_CMP_PSNR 4
1914 #define FF_CMP_BIT 5
1916 #define FF_CMP_ZERO 7
1917 #define FF_CMP_VSAD 8
1918 #define FF_CMP_VSSE 9
1919 #define FF_CMP_NSSE 10
1920 #define FF_CMP_W53 11
1921 #define FF_CMP_W97 12
1922 #define FF_CMP_DCTMAX 13
1923 #define FF_CMP_DCT264 14
1924 #define FF_CMP_CHROMA 256
1927 * ME diamond size & shape
1928 * - encoding: Set by user.
1929 * - decoding: unused
1934 * amount of previous MV predictors (2a+1 x 2a+1 square)
1935 * - encoding: Set by user.
1936 * - decoding: unused
1938 int last_predictor_count;
1941 * prepass for motion estimation
1942 * - encoding: Set by user.
1943 * - decoding: unused
1948 * motion estimation prepass comparison function
1949 * - encoding: Set by user.
1950 * - decoding: unused
1955 * ME prepass diamond size & shape
1956 * - encoding: Set by user.
1957 * - decoding: unused
1963 * - encoding: Set by user.
1964 * - decoding: unused
1966 int me_subpel_quality;
1969 * callback to negotiate the pixelFormat
1970 * @param fmt is the list of formats which are supported by the codec,
1971 * it is terminated by -1 as 0 is a valid format, the formats are ordered by quality.
1972 * The first is always the native one.
1973 * @return the chosen format
1974 * - encoding: unused
1975 * - decoding: Set by user, if not set the native format will be chosen.
1977 enum PixelFormat (*get_format)(struct AVCodecContext *s, const enum PixelFormat * fmt);
1980 * DTG active format information (additional aspect ratio
1981 * information only used in DVB MPEG-2 transport streams)
1984 * - encoding: unused
1985 * - decoding: Set by decoder.
1987 int dtg_active_format;
1988 #define FF_DTG_AFD_SAME 8
1989 #define FF_DTG_AFD_4_3 9
1990 #define FF_DTG_AFD_16_9 10
1991 #define FF_DTG_AFD_14_9 11
1992 #define FF_DTG_AFD_4_3_SP_14_9 13
1993 #define FF_DTG_AFD_16_9_SP_14_9 14
1994 #define FF_DTG_AFD_SP_4_3 15
1997 * maximum motion estimation search range in subpel units
1998 * If 0 then no limit.
2000 * - encoding: Set by user.
2001 * - decoding: unused
2006 * intra quantizer bias
2007 * - encoding: Set by user.
2008 * - decoding: unused
2010 int intra_quant_bias;
2011 #define FF_DEFAULT_QUANT_BIAS 999999
2014 * inter quantizer bias
2015 * - encoding: Set by user.
2016 * - decoding: unused
2018 int inter_quant_bias;
2022 * - encoding: unused
2023 * - decoding: Which clrtable should be used for 8bit RGB images.
2024 * Tables have to be stored somewhere. FIXME
2029 * Global quality for codecs which cannot change it per frame.
2030 * This should be proportional to MPEG-1/2/4 qscale.
2031 * - encoding: Set by user.
2032 * - decoding: unused
2036 #define FF_CODER_TYPE_VLC 0
2037 #define FF_CODER_TYPE_AC 1
2038 #define FF_CODER_TYPE_RAW 2
2039 #define FF_CODER_TYPE_RLE 3
2040 #define FF_CODER_TYPE_DEFLATE 4
2043 * - encoding: Set by user.
2044 * - decoding: unused
2050 * - encoding: Set by user.
2051 * - decoding: unused
2057 * - encoding: unused
2058 * - decoding: Set by user.
2060 uint8_t * (*realloc)(struct AVCodecContext *s, uint8_t *buf, int buf_size);
2065 * - encoding: unused
2066 * - decoding: Set by user.
2069 #define SLICE_FLAG_CODED_ORDER 0x0001 ///< draw_horiz_band() is called in coded order instead of display
2070 #define SLICE_FLAG_ALLOW_FIELD 0x0002 ///< allow draw_horiz_band() with field slices (MPEG2 field pics)
2071 #define SLICE_FLAG_ALLOW_PLANE 0x0004 ///< allow draw_horiz_band() with 1 component at a time (SVQ1)
2074 * XVideo Motion Acceleration
2075 * - encoding: forbidden
2076 * - decoding: set by decoder
2078 int xvmc_acceleration;
2081 * macroblock decision mode
2082 * - encoding: Set by user.
2083 * - decoding: unused
2086 #define FF_MB_DECISION_SIMPLE 0 ///< uses mb_cmp
2087 #define FF_MB_DECISION_BITS 1 ///< chooses the one which needs the fewest bits
2088 #define FF_MB_DECISION_RD 2 ///< rate distortion
2091 * custom intra quantization matrix
2092 * - encoding: Set by user, can be NULL.
2093 * - decoding: Set by libavcodec.
2095 uint16_t *intra_matrix;
2098 * custom inter quantization matrix
2099 * - encoding: Set by user, can be NULL.
2100 * - decoding: Set by libavcodec.
2102 uint16_t *inter_matrix;
2105 * fourcc from the AVI stream header (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A').
2106 * This is used to work around some encoder bugs.
2107 * - encoding: unused
2108 * - decoding: Set by user, will be converted to uppercase by libavcodec during init.
2110 unsigned int stream_codec_tag;
2113 * scene change detection threshold
2114 * 0 is default, larger means fewer detected scene changes.
2115 * - encoding: Set by user.
2116 * - decoding: unused
2118 int scenechange_threshold;
2121 * minimum Lagrange multipler
2122 * - encoding: Set by user.
2123 * - decoding: unused
2128 * maximum Lagrange multipler
2129 * - encoding: Set by user.
2130 * - decoding: unused
2135 * noise reduction strength
2136 * - encoding: Set by user.
2137 * - decoding: unused
2139 int noise_reduction;
2142 * Called at the beginning of a frame to get cr buffer for it.
2143 * Buffer type (size, hints) must be the same. libavcodec won't check it.
2144 * libavcodec will pass previous buffer in pic, function should return
2145 * same buffer or new buffer with old frame "painted" into it.
2146 * If pic.data[0] == NULL must behave like get_buffer().
2147 * if CODEC_CAP_DR1 is not set then reget_buffer() must call
2148 * avcodec_default_reget_buffer() instead of providing buffers allocated by
2150 * - encoding: unused
2151 * - decoding: Set by libavcodec, user can override.
2153 int (*reget_buffer)(struct AVCodecContext *c, AVFrame *pic);
2156 * Number of bits which should be loaded into the rc buffer before decoding starts.
2157 * - encoding: Set by user.
2158 * - decoding: unused
2160 int rc_initial_buffer_occupancy;
2164 * - encoding: Set by user.
2165 * - decoding: unused
2167 int inter_threshold;
2171 * - encoding: Set by user.
2172 * - decoding: Set by user.
2177 * Simulates errors in the bitstream to test error concealment.
2178 * - encoding: Set by user.
2179 * - decoding: unused
2184 * quantizer noise shaping
2185 * - encoding: Set by user.
2186 * - decoding: unused
2188 int quantizer_noise_shaping;
2192 * is used to decide how many independent tasks should be passed to execute()
2193 * - encoding: Set by user.
2194 * - decoding: Set by user.
2199 * The codec may call this to execute several independent things.
2200 * It will return only after finishing all tasks.
2201 * The user may replace this with some multithreaded implementation,
2202 * the default implementation will execute the parts serially.
2203 * @param count the number of things to execute
2204 * - encoding: Set by libavcodec, user can override.
2205 * - decoding: Set by libavcodec, user can override.
2207 int (*execute)(struct AVCodecContext *c, int (*func)(struct AVCodecContext *c2, void *arg), void *arg2, int *ret, int count, int size);
2211 * Can be used by execute() to store some per AVCodecContext stuff.
2212 * - encoding: set by execute()
2213 * - decoding: set by execute()
2215 void *thread_opaque;
2218 * Motion estimation threshold below which no motion estimation is
2219 * performed, but instead the user specified motion vectors are used.
2221 * - encoding: Set by user.
2222 * - decoding: unused
2227 * Macroblock threshold below which the user specified macroblock types will be used.
2228 * - encoding: Set by user.
2229 * - decoding: unused
2234 * precision of the intra DC coefficient - 8
2235 * - encoding: Set by user.
2236 * - decoding: unused
2238 int intra_dc_precision;
2241 * noise vs. sse weight for the nsse comparsion function
2242 * - encoding: Set by user.
2243 * - decoding: unused
2248 * Number of macroblock rows at the top which are skipped.
2249 * - encoding: unused
2250 * - decoding: Set by user.
2255 * Number of macroblock rows at the bottom which are skipped.
2256 * - encoding: unused
2257 * - decoding: Set by user.
2263 * - encoding: Set by user.
2264 * - decoding: Set by libavcodec.
2267 #define FF_PROFILE_UNKNOWN -99
2268 #define FF_PROFILE_RESERVED -100
2270 #define FF_PROFILE_AAC_MAIN 0
2271 #define FF_PROFILE_AAC_LOW 1
2272 #define FF_PROFILE_AAC_SSR 2
2273 #define FF_PROFILE_AAC_LTP 3
2275 #define FF_PROFILE_DTS 20
2276 #define FF_PROFILE_DTS_ES 30
2277 #define FF_PROFILE_DTS_96_24 40
2278 #define FF_PROFILE_DTS_HD_HRA 50
2279 #define FF_PROFILE_DTS_HD_MA 60
2281 #define FF_PROFILE_MPEG2_422 0
2282 #define FF_PROFILE_MPEG2_HIGH 1
2283 #define FF_PROFILE_MPEG2_SS 2
2284 #define FF_PROFILE_MPEG2_SNR_SCALABLE 3
2285 #define FF_PROFILE_MPEG2_MAIN 4
2286 #define FF_PROFILE_MPEG2_SIMPLE 5
2288 #define FF_PROFILE_H264_CONSTRAINED (1<<9) // 8+1; constraint_set1_flag
2289 #define FF_PROFILE_H264_INTRA (1<<11) // 8+3; constraint_set3_flag
2291 #define FF_PROFILE_H264_BASELINE 66
2292 #define FF_PROFILE_H264_CONSTRAINED_BASELINE (66|FF_PROFILE_H264_CONSTRAINED)
2293 #define FF_PROFILE_H264_MAIN 77
2294 #define FF_PROFILE_H264_EXTENDED 88
2295 #define FF_PROFILE_H264_HIGH 100
2296 #define FF_PROFILE_H264_HIGH_10 110
2297 #define FF_PROFILE_H264_HIGH_10_INTRA (110|FF_PROFILE_H264_INTRA)
2298 #define FF_PROFILE_H264_HIGH_422 122
2299 #define FF_PROFILE_H264_HIGH_422_INTRA (122|FF_PROFILE_H264_INTRA)
2300 #define FF_PROFILE_H264_HIGH_444 144
2301 #define FF_PROFILE_H264_HIGH_444_PREDICTIVE 244
2302 #define FF_PROFILE_H264_HIGH_444_INTRA (244|FF_PROFILE_H264_INTRA)
2303 #define FF_PROFILE_H264_CAVLC_444 44
2305 #define FF_PROFILE_VC1_SIMPLE 0
2306 #define FF_PROFILE_VC1_MAIN 1
2307 #define FF_PROFILE_VC1_COMPLEX 2
2308 #define FF_PROFILE_VC1_ADVANCED 3
2310 #define FF_PROFILE_MPEG4_SIMPLE 0
2311 #define FF_PROFILE_MPEG4_SIMPLE_SCALABLE 1
2312 #define FF_PROFILE_MPEG4_CORE 2
2313 #define FF_PROFILE_MPEG4_MAIN 3
2314 #define FF_PROFILE_MPEG4_N_BIT 4
2315 #define FF_PROFILE_MPEG4_SCALABLE_TEXTURE 5
2316 #define FF_PROFILE_MPEG4_SIMPLE_FACE_ANIMATION 6
2317 #define FF_PROFILE_MPEG4_BASIC_ANIMATED_TEXTURE 7
2318 #define FF_PROFILE_MPEG4_HYBRID 8
2319 #define FF_PROFILE_MPEG4_ADVANCED_REAL_TIME 9
2320 #define FF_PROFILE_MPEG4_CORE_SCALABLE 10
2321 #define FF_PROFILE_MPEG4_ADVANCED_CODING 11
2322 #define FF_PROFILE_MPEG4_ADVANCED_CORE 12
2323 #define FF_PROFILE_MPEG4_ADVANCED_SCALABLE_TEXTURE 13
2324 #define FF_PROFILE_MPEG4_SIMPLE_STUDIO 14
2325 #define FF_PROFILE_MPEG4_ADVANCED_SIMPLE 15
2329 * - encoding: Set by user.
2330 * - decoding: Set by libavcodec.
2333 #define FF_LEVEL_UNKNOWN -99
2336 * low resolution decoding, 1-> 1/2 size, 2->1/4 size
2337 * - encoding: unused
2338 * - decoding: Set by user.
2343 * Bitstream width / height, may be different from width/height if lowres enabled.
2344 * - encoding: unused
2345 * - decoding: Set by user before init if known. Codec should override / dynamically change if needed.
2347 int coded_width, coded_height;
2350 * frame skip threshold
2351 * - encoding: Set by user.
2352 * - decoding: unused
2354 int frame_skip_threshold;
2358 * - encoding: Set by user.
2359 * - decoding: unused
2361 int frame_skip_factor;
2364 * frame skip exponent
2365 * - encoding: Set by user.
2366 * - decoding: unused
2371 * frame skip comparison function
2372 * - encoding: Set by user.
2373 * - decoding: unused
2378 * Border processing masking, raises the quantizer for mbs on the borders
2380 * - encoding: Set by user.
2381 * - decoding: unused
2383 float border_masking;
2386 * minimum MB lagrange multipler
2387 * - encoding: Set by user.
2388 * - decoding: unused
2393 * maximum MB lagrange multipler
2394 * - encoding: Set by user.
2395 * - decoding: unused
2401 * - encoding: Set by user.
2402 * - decoding: unused
2404 int me_penalty_compensation;
2408 * - encoding: unused
2409 * - decoding: Set by user.
2411 enum AVDiscard skip_loop_filter;
2415 * - encoding: unused
2416 * - decoding: Set by user.
2418 enum AVDiscard skip_idct;
2422 * - encoding: unused
2423 * - decoding: Set by user.
2425 enum AVDiscard skip_frame;
2429 * - encoding: Set by user.
2430 * - decoding: unused
2436 * - encoding: Set by user.
2437 * - decoding: unused
2443 * - encoding: Set by user.
2444 * - decoding: unused
2449 * number of reference frames
2450 * - encoding: Set by user.
2451 * - decoding: Set by lavc.
2456 * chroma qp offset from luma
2457 * - encoding: Set by user.
2458 * - decoding: unused
2463 * trellis RD quantization
2464 * - encoding: Set by user.
2465 * - decoding: unused
2470 * Audio cutoff bandwidth (0 means "automatic")
2471 * - encoding: Set by user.
2472 * - decoding: unused
2477 * Multiplied by qscale for each frame and added to scene_change_score.
2478 * - encoding: Set by user.
2479 * - decoding: unused
2481 int scenechange_factor;
2485 * Note: Value depends upon the compare function used for fullpel ME.
2486 * - encoding: Set by user.
2487 * - decoding: unused
2492 * Adjust sensitivity of b_frame_strategy 1.
2493 * - encoding: Set by user.
2494 * - decoding: unused
2499 * - encoding: Set by user.
2500 * - decoding: unused
2502 int compression_level;
2503 #define FF_COMPRESSION_DEFAULT -1
2506 * - encoding: Set by user.
2507 * - decoding: unused
2509 int min_prediction_order;
2512 * - encoding: Set by user.
2513 * - decoding: unused
2515 int max_prediction_order;
2518 * GOP timecode frame start number, in non drop frame format
2519 * - encoding: Set by user.
2520 * - decoding: unused
2522 int64_t timecode_frame_start;
2524 #if FF_API_REQUEST_CHANNELS
2526 * Decoder should decode to this many channels if it can (0 for default)
2527 * - encoding: unused
2528 * - decoding: Set by user.
2529 * @deprecated Deprecated in favor of request_channel_layout.
2531 int request_channels;
2535 * opaque 64bit number (generally a PTS) that will be reordered and
2536 * output in AVFrame.reordered_opaque
2537 * @deprecated in favor of pkt_pts
2538 * - encoding: unused
2539 * - decoding: Set by user.
2541 int64_t reordered_opaque;
2544 * Bits per sample/pixel of internal libavcodec pixel/sample format.
2545 * - encoding: set by user.
2546 * - decoding: set by libavcodec.
2548 int bits_per_raw_sample;
2551 * Audio channel layout.
2552 * - encoding: set by user.
2553 * - decoding: set by libavcodec.
2555 uint64_t channel_layout;
2558 * Request decoder to use this channel layout if it can (0 for default)
2559 * - encoding: unused
2560 * - decoding: Set by user.
2562 uint64_t request_channel_layout;
2565 * Ratecontrol attempt to use, at maximum, <value> of what can be used without an underflow.
2566 * - encoding: Set by user.
2567 * - decoding: unused.
2569 float rc_max_available_vbv_use;
2572 * Ratecontrol attempt to use, at least, <value> times the amount needed to prevent a vbv overflow.
2573 * - encoding: Set by user.
2574 * - decoding: unused.
2576 float rc_min_vbv_overflow_use;
2579 * Hardware accelerator in use
2580 * - encoding: unused.
2581 * - decoding: Set by libavcodec
2583 struct AVHWAccel *hwaccel;
2586 * For some codecs, the time base is closer to the field rate than the frame rate.
2587 * Most notably, H.264 and MPEG-2 specify time_base as half of frame duration
2588 * if no telecine is used ...
2590 * Set to time_base ticks per frame. Default 1, e.g., H.264/MPEG-2 set it to 2.
2592 int ticks_per_frame;
2595 * Hardware accelerator context.
2596 * For some hardware accelerators, a global context needs to be
2597 * provided by the user. In that case, this holds display-dependent
2598 * data Libav cannot instantiate itself. Please refer to the
2599 * Libav HW accelerator documentation to know how to fill this
2600 * is. e.g. for VA API, this is a struct vaapi_context.
2601 * - encoding: unused
2602 * - decoding: Set by user
2604 void *hwaccel_context;
2607 * Chromaticity coordinates of the source primaries.
2608 * - encoding: Set by user
2609 * - decoding: Set by libavcodec
2611 enum AVColorPrimaries color_primaries;
2614 * Color Transfer Characteristic.
2615 * - encoding: Set by user
2616 * - decoding: Set by libavcodec
2618 enum AVColorTransferCharacteristic color_trc;
2621 * YUV colorspace type.
2622 * - encoding: Set by user
2623 * - decoding: Set by libavcodec
2625 enum AVColorSpace colorspace;
2628 * MPEG vs JPEG YUV range.
2629 * - encoding: Set by user
2630 * - decoding: Set by libavcodec
2632 enum AVColorRange color_range;
2635 * This defines the location of chroma samples.
2636 * - encoding: Set by user
2637 * - decoding: Set by libavcodec
2639 enum AVChromaLocation chroma_sample_location;
2642 * The codec may call this to execute several independent things.
2643 * It will return only after finishing all tasks.
2644 * The user may replace this with some multithreaded implementation,
2645 * the default implementation will execute the parts serially.
2646 * Also see avcodec_thread_init and e.g. the --enable-pthread configure option.
2647 * @param c context passed also to func
2648 * @param count the number of things to execute
2649 * @param arg2 argument passed unchanged to func
2650 * @param ret return values of executed functions, must have space for "count" values. May be NULL.
2651 * @param func function that will be called count times, with jobnr from 0 to count-1.
2652 * threadnr will be in the range 0 to c->thread_count-1 < MAX_THREADS and so that no
2653 * two instances of func executing at the same time will have the same threadnr.
2654 * @return always 0 currently, but code should handle a future improvement where when any call to func
2655 * returns < 0 no further calls to func may be done and < 0 is returned.
2656 * - encoding: Set by libavcodec, user can override.
2657 * - decoding: Set by libavcodec, user can override.
2659 int (*execute2)(struct AVCodecContext *c, int (*func)(struct AVCodecContext *c2, void *arg, int jobnr, int threadnr), void *arg2, int *ret, int count);
2661 int log_level_offset;
2665 * Indicates number of picture subdivisions. Used for parallelized
2667 * - encoding: Set by user
2668 * - decoding: unused
2673 * Header containing style information for text subtitles.
2674 * For SUBTITLE_ASS subtitle type, it should contain the whole ASS
2675 * [Script Info] and [V4+ Styles] section, plus the [Events] line and
2676 * the Format line following. It shouldn't include any Dialogue line.
2677 * - encoding: Set/allocated/freed by user (before avcodec_open2())
2678 * - decoding: Set/allocated/freed by libavcodec (by avcodec_open2())
2680 uint8_t *subtitle_header;
2681 int subtitle_header_size;
2684 * Current packet as passed into the decoder, to avoid having
2685 * to pass the packet into every function. Currently only valid
2686 * inside lavc and get/release_buffer callbacks.
2687 * - decoding: set by avcodec_decode_*, read by get_buffer() for setting pkt_pts
2688 * - encoding: unused
2693 * Which multithreading methods to use.
2694 * Use of FF_THREAD_FRAME will increase decoding delay by one frame per thread,
2695 * so clients which cannot provide future frames should not use it.
2697 * - encoding: Set by user, otherwise the default is used.
2698 * - decoding: Set by user, otherwise the default is used.
2701 #define FF_THREAD_FRAME 1 ///< Decode more than one frame at once
2702 #define FF_THREAD_SLICE 2 ///< Decode more than one part of a single frame at once
2705 * Which multithreading methods are in use by the codec.
2706 * - encoding: Set by libavcodec.
2707 * - decoding: Set by libavcodec.
2709 int active_thread_type;
2712 * Set by the client if its custom get_buffer() callback can be called
2713 * from another thread, which allows faster multithreaded decoding.
2714 * draw_horiz_band() will be called from other threads regardless of this setting.
2715 * Ignored if the default get_buffer() is used.
2716 * - encoding: Set by user.
2717 * - decoding: Set by user.
2719 int thread_safe_callbacks;
2722 * VBV delay coded in the last frame (in periods of a 27 MHz clock).
2723 * Used for compliant TS muxing.
2724 * - encoding: Set by libavcodec.
2725 * - decoding: unused.
2730 * Type of service that the audio stream conveys.
2731 * - encoding: Set by user.
2732 * - decoding: Set by libavcodec.
2734 enum AVAudioServiceType audio_service_type;
2737 * Used to request a sample format from the decoder.
2738 * - encoding: unused.
2739 * - decoding: Set by user.
2741 enum AVSampleFormat request_sample_fmt;
2744 * Error recognition; may misdetect some more or less valid parts as errors.
2745 * - encoding: unused
2746 * - decoding: Set by user.
2748 int err_recognition;
2749 #define AV_EF_CRCCHECK (1<<0)
2750 #define AV_EF_BITSTREAM (1<<1)
2751 #define AV_EF_BUFFER (1<<2)
2752 #define AV_EF_EXPLODE (1<<3)
2755 * Private context used for internal data.
2757 * Unlike priv_data, this is not codec-specific. It is used in general
2758 * libavcodec functions.
2760 struct AVCodecInternal *internal;
2763 * - encoding: set by libavcodec
2764 * - decoding: Set by libavcodec
2766 enum AVFieldOrder field_order;
2772 typedef struct AVProfile {
2774 const char *name; ///< short name for the profile
2777 typedef struct AVCodecDefault AVCodecDefault;
2782 typedef struct AVCodec {
2784 * Name of the codec implementation.
2785 * The name is globally unique among encoders and among decoders (but an
2786 * encoder and a decoder can share the same name).
2787 * This is the primary way to find a codec from the user perspective.
2790 enum AVMediaType type;
2793 int (*init)(AVCodecContext *);
2794 int (*encode)(AVCodecContext *, uint8_t *buf, int buf_size, void *data);
2795 int (*close)(AVCodecContext *);
2796 int (*decode)(AVCodecContext *, void *outdata, int *outdata_size, AVPacket *avpkt);
2798 * Codec capabilities.
2802 struct AVCodec *next;
2805 * Will be called when seeking
2807 void (*flush)(AVCodecContext *);
2808 const AVRational *supported_framerates; ///< array of supported framerates, or NULL if any, array is terminated by {0,0}
2809 const enum PixelFormat *pix_fmts; ///< array of supported pixel formats, or NULL if unknown, array is terminated by -1
2811 * Descriptive name for the codec, meant to be more human readable than name.
2812 * You should use the NULL_IF_CONFIG_SMALL() macro to define it.
2814 const char *long_name;
2815 const int *supported_samplerates; ///< array of supported audio samplerates, or NULL if unknown, array is terminated by 0
2816 const enum AVSampleFormat *sample_fmts; ///< array of supported sample formats, or NULL if unknown, array is terminated by -1
2817 const uint64_t *channel_layouts; ///< array of support channel layouts, or NULL if unknown. array is terminated by 0
2818 uint8_t max_lowres; ///< maximum value for lowres supported by the decoder
2819 const AVClass *priv_class; ///< AVClass for the private context
2820 const AVProfile *profiles; ///< array of recognized profiles, or NULL if unknown, array is terminated by {FF_PROFILE_UNKNOWN}
2823 * @name Frame-level threading support functions
2827 * If defined, called on thread contexts when they are created.
2828 * If the codec allocates writable tables in init(), re-allocate them here.
2829 * priv_data will be set to a copy of the original.
2831 int (*init_thread_copy)(AVCodecContext *);
2833 * Copy necessary context variables from a previous thread context to the current one.
2834 * If not defined, the next thread will start automatically; otherwise, the codec
2835 * must call ff_thread_finish_setup().
2837 * dst and src will (rarely) point to the same context, in which case memcpy should be skipped.
2839 int (*update_thread_context)(AVCodecContext *dst, const AVCodecContext *src);
2843 * Private codec-specific defaults.
2845 const AVCodecDefault *defaults;
2848 * Initialize codec static data, called from avcodec_register().
2850 void (*init_static_data)(struct AVCodec *codec);
2853 * Encode data to an AVPacket.
2855 * @param avctx codec context
2856 * @param avpkt output AVPacket (may contain a user-provided buffer)
2857 * @param[in] frame AVFrame containing the raw data to be encoded
2858 * @param[out] got_packet_ptr encoder sets to 0 or 1 to indicate that a
2859 * non-empty packet was returned in avpkt.
2860 * @return 0 on success, negative error code on failure
2862 int (*encode2)(AVCodecContext *avctx, AVPacket *avpkt, const AVFrame *frame,
2863 int *got_packet_ptr);
2869 typedef struct AVHWAccel {
2871 * Name of the hardware accelerated codec.
2872 * The name is globally unique among encoders and among decoders (but an
2873 * encoder and a decoder can share the same name).
2878 * Type of codec implemented by the hardware accelerator.
2880 * See AVMEDIA_TYPE_xxx
2882 enum AVMediaType type;
2885 * Codec implemented by the hardware accelerator.
2892 * Supported pixel format.
2894 * Only hardware accelerated formats are supported here.
2896 enum PixelFormat pix_fmt;
2899 * Hardware accelerated codec capabilities.
2900 * see FF_HWACCEL_CODEC_CAP_*
2904 struct AVHWAccel *next;
2907 * Called at the beginning of each frame or field picture.
2909 * Meaningful frame information (codec specific) is guaranteed to
2910 * be parsed at this point. This function is mandatory.
2912 * Note that buf can be NULL along with buf_size set to 0.
2913 * Otherwise, this means the whole frame is available at this point.
2915 * @param avctx the codec context
2916 * @param buf the frame data buffer base
2917 * @param buf_size the size of the frame in bytes
2918 * @return zero if successful, a negative value otherwise
2920 int (*start_frame)(AVCodecContext *avctx, const uint8_t *buf, uint32_t buf_size);
2923 * Callback for each slice.
2925 * Meaningful slice information (codec specific) is guaranteed to
2926 * be parsed at this point. This function is mandatory.
2928 * @param avctx the codec context
2929 * @param buf the slice data buffer base
2930 * @param buf_size the size of the slice in bytes
2931 * @return zero if successful, a negative value otherwise
2933 int (*decode_slice)(AVCodecContext *avctx, const uint8_t *buf, uint32_t buf_size);
2936 * Called at the end of each frame or field picture.
2938 * The whole picture is parsed at this point and can now be sent
2939 * to the hardware accelerator. This function is mandatory.
2941 * @param avctx the codec context
2942 * @return zero if successful, a negative value otherwise
2944 int (*end_frame)(AVCodecContext *avctx);
2947 * Size of HW accelerator private data.
2949 * Private data is allocated with av_mallocz() before
2950 * AVCodecContext.get_buffer() and deallocated after
2951 * AVCodecContext.release_buffer().
2957 * four components are given, that's all.
2958 * the last component is alpha
2960 typedef struct AVPicture {
2961 uint8_t *data[AV_NUM_DATA_POINTERS];
2962 int linesize[AV_NUM_DATA_POINTERS]; ///< number of bytes per line
2965 #define AVPALETTE_SIZE 1024
2966 #define AVPALETTE_COUNT 256
2968 enum AVSubtitleType {
2971 SUBTITLE_BITMAP, ///< A bitmap, pict will be set
2974 * Plain text, the text field must be set by the decoder and is
2975 * authoritative. ass and pict fields may contain approximations.
2980 * Formatted text, the ass field must be set by the decoder and is
2981 * authoritative. pict and text fields may contain approximations.
2986 typedef struct AVSubtitleRect {
2987 int x; ///< top left corner of pict, undefined when pict is not set
2988 int y; ///< top left corner of pict, undefined when pict is not set
2989 int w; ///< width of pict, undefined when pict is not set
2990 int h; ///< height of pict, undefined when pict is not set
2991 int nb_colors; ///< number of colors in pict, undefined when pict is not set
2994 * data+linesize for the bitmap of this subtitle.
2995 * can be set for text/ass as well once they where rendered
2998 enum AVSubtitleType type;
3000 char *text; ///< 0 terminated plain UTF-8 text
3003 * 0 terminated ASS/SSA compatible event line.
3004 * The pressentation of this is unaffected by the other values in this
3010 typedef struct AVSubtitle {
3011 uint16_t format; /* 0 = graphics */
3012 uint32_t start_display_time; /* relative to packet pts, in ms */
3013 uint32_t end_display_time; /* relative to packet pts, in ms */
3015 AVSubtitleRect **rects;
3016 int64_t pts; ///< Same as packet pts, in AV_TIME_BASE
3019 /* packet functions */
3022 * @deprecated use NULL instead
3024 attribute_deprecated void av_destruct_packet_nofree(AVPacket *pkt);
3027 * Default packet destructor.
3029 void av_destruct_packet(AVPacket *pkt);
3032 * Initialize optional fields of a packet with default values.
3036 void av_init_packet(AVPacket *pkt);
3039 * Allocate the payload of a packet and initialize its fields with
3043 * @param size wanted payload size
3044 * @return 0 if OK, AVERROR_xxx otherwise
3046 int av_new_packet(AVPacket *pkt, int size);
3049 * Reduce packet size, correctly zeroing padding
3052 * @param size new size
3054 void av_shrink_packet(AVPacket *pkt, int size);
3057 * Increase packet size, correctly zeroing padding
3060 * @param grow_by number of bytes by which to increase the size of the packet
3062 int av_grow_packet(AVPacket *pkt, int grow_by);
3065 * @warning This is a hack - the packet memory allocation stuff is broken. The
3066 * packet is allocated if it was not really allocated.
3068 int av_dup_packet(AVPacket *pkt);
3073 * @param pkt packet to free
3075 void av_free_packet(AVPacket *pkt);
3078 * Allocate new information of a packet.
3081 * @param type side information type
3082 * @param size side information size
3083 * @return pointer to fresh allocated data or NULL otherwise
3085 uint8_t* av_packet_new_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
3089 * Get side information from packet.
3092 * @param type desired side information type
3093 * @param size pointer for side information size to store (optional)
3094 * @return pointer to data if present or NULL otherwise
3096 uint8_t* av_packet_get_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
3101 struct ReSampleContext;
3102 struct AVResampleContext;
3104 typedef struct ReSampleContext ReSampleContext;
3107 * Initialize audio resampling context.
3109 * @param output_channels number of output channels
3110 * @param input_channels number of input channels
3111 * @param output_rate output sample rate
3112 * @param input_rate input sample rate
3113 * @param sample_fmt_out requested output sample format
3114 * @param sample_fmt_in input sample format
3115 * @param filter_length length of each FIR filter in the filterbank relative to the cutoff frequency
3116 * @param log2_phase_count log2 of the number of entries in the polyphase filterbank
3117 * @param linear if 1 then the used FIR filter will be linearly interpolated
3118 between the 2 closest, if 0 the closest will be used
3119 * @param cutoff cutoff frequency, 1.0 corresponds to half the output sampling rate
3120 * @return allocated ReSampleContext, NULL if error occurred
3122 ReSampleContext *av_audio_resample_init(int output_channels, int input_channels,
3123 int output_rate, int input_rate,
3124 enum AVSampleFormat sample_fmt_out,
3125 enum AVSampleFormat sample_fmt_in,
3126 int filter_length, int log2_phase_count,
3127 int linear, double cutoff);
3129 int audio_resample(ReSampleContext *s, short *output, short *input, int nb_samples);
3132 * Free resample context.
3134 * @param s a non-NULL pointer to a resample context previously
3135 * created with av_audio_resample_init()
3137 void audio_resample_close(ReSampleContext *s);
3141 * Initialize an audio resampler.
3142 * Note, if either rate is not an integer then simply scale both rates up so they are.
3143 * @param filter_length length of each FIR filter in the filterbank relative to the cutoff freq
3144 * @param log2_phase_count log2 of the number of entries in the polyphase filterbank
3145 * @param linear If 1 then the used FIR filter will be linearly interpolated
3146 between the 2 closest, if 0 the closest will be used
3147 * @param cutoff cutoff frequency, 1.0 corresponds to half the output sampling rate
3149 struct AVResampleContext *av_resample_init(int out_rate, int in_rate, int filter_length, int log2_phase_count, int linear, double cutoff);
3152 * Resample an array of samples using a previously configured context.
3153 * @param src an array of unconsumed samples
3154 * @param consumed the number of samples of src which have been consumed are returned here
3155 * @param src_size the number of unconsumed samples available
3156 * @param dst_size the amount of space in samples available in dst
3157 * @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.
3158 * @return the number of samples written in dst or -1 if an error occurred
3160 int av_resample(struct AVResampleContext *c, short *dst, short *src, int *consumed, int src_size, int dst_size, int update_ctx);
3164 * Compensate samplerate/timestamp drift. The compensation is done by changing
3165 * the resampler parameters, so no audible clicks or similar distortions occur
3166 * @param compensation_distance distance in output samples over which the compensation should be performed
3167 * @param sample_delta number of output samples which should be output less
3169 * example: av_resample_compensate(c, 10, 500)
3170 * here instead of 510 samples only 500 samples would be output
3172 * note, due to rounding the actual compensation might be slightly different,
3173 * especially if the compensation_distance is large and the in_rate used during init is small
3175 void av_resample_compensate(struct AVResampleContext *c, int sample_delta, int compensation_distance);
3176 void av_resample_close(struct AVResampleContext *c);
3179 * Allocate memory for a picture. Call avpicture_free() to free it.
3181 * @see avpicture_fill()
3183 * @param picture the picture to be filled in
3184 * @param pix_fmt the format of the picture
3185 * @param width the width of the picture
3186 * @param height the height of the picture
3187 * @return zero if successful, a negative value if not
3189 int avpicture_alloc(AVPicture *picture, enum PixelFormat pix_fmt, int width, int height);
3192 * Free a picture previously allocated by avpicture_alloc().
3193 * The data buffer used by the AVPicture is freed, but the AVPicture structure
3196 * @param picture the AVPicture to be freed
3198 void avpicture_free(AVPicture *picture);
3201 * Fill in the AVPicture fields.
3202 * The fields of the given AVPicture are filled in by using the 'ptr' address
3203 * which points to the image data buffer. Depending on the specified picture
3204 * format, one or multiple image data pointers and line sizes will be set.
3205 * If a planar format is specified, several pointers will be set pointing to
3206 * the different picture planes and the line sizes of the different planes
3207 * will be stored in the lines_sizes array.
3208 * Call with ptr == NULL to get the required size for the ptr buffer.
3210 * To allocate the buffer and fill in the AVPicture fields in one call,
3211 * use avpicture_alloc().
3213 * @param picture AVPicture whose fields are to be filled in
3214 * @param ptr Buffer which will contain or contains the actual image data
3215 * @param pix_fmt The format in which the picture data is stored.
3216 * @param width the width of the image in pixels
3217 * @param height the height of the image in pixels
3218 * @return size of the image data in bytes
3220 int avpicture_fill(AVPicture *picture, uint8_t *ptr,
3221 enum PixelFormat pix_fmt, int width, int height);
3224 * Copy pixel data from an AVPicture into a buffer.
3225 * The data is stored compactly, without any gaps for alignment or padding
3226 * which may be applied by avpicture_fill().
3228 * @see avpicture_get_size()
3230 * @param[in] src AVPicture containing image data
3231 * @param[in] pix_fmt The format in which the picture data is stored.
3232 * @param[in] width the width of the image in pixels.
3233 * @param[in] height the height of the image in pixels.
3234 * @param[out] dest A buffer into which picture data will be copied.
3235 * @param[in] dest_size The size of 'dest'.
3236 * @return The number of bytes written to dest, or a negative value (error code) on error.
3238 int avpicture_layout(const AVPicture* src, enum PixelFormat pix_fmt, int width, int height,
3239 unsigned char *dest, int dest_size);
3242 * Calculate the size in bytes that a picture of the given width and height
3243 * would occupy if stored in the given picture format.
3244 * Note that this returns the size of a compact representation as generated
3245 * by avpicture_layout(), which can be smaller than the size required for e.g.
3248 * @param pix_fmt the given picture format
3249 * @param width the width of the image
3250 * @param height the height of the image
3251 * @return Image data size in bytes or -1 on error (e.g. too large dimensions).
3253 int avpicture_get_size(enum PixelFormat pix_fmt, int width, int height);
3254 void avcodec_get_chroma_sub_sample(enum PixelFormat pix_fmt, int *h_shift, int *v_shift);
3256 void avcodec_set_dimensions(AVCodecContext *s, int width, int height);
3259 * Return a value representing the fourCC code associated to the
3260 * pixel format pix_fmt, or 0 if no associated fourCC code can be
3263 unsigned int avcodec_pix_fmt_to_codec_tag(enum PixelFormat pix_fmt);
3266 * Put a string representing the codec tag codec_tag in buf.
3268 * @param buf_size size in bytes of buf
3269 * @return the length of the string that would have been generated if
3270 * enough space had been available, excluding the trailing null
3272 size_t av_get_codec_tag_string(char *buf, size_t buf_size, unsigned int codec_tag);
3274 #define FF_LOSS_RESOLUTION 0x0001 /**< loss due to resolution change */
3275 #define FF_LOSS_DEPTH 0x0002 /**< loss due to color depth change */
3276 #define FF_LOSS_COLORSPACE 0x0004 /**< loss due to color space conversion */
3277 #define FF_LOSS_ALPHA 0x0008 /**< loss of alpha bits */
3278 #define FF_LOSS_COLORQUANT 0x0010 /**< loss due to color quantization */
3279 #define FF_LOSS_CHROMA 0x0020 /**< loss of chroma (e.g. RGB to gray conversion) */
3282 * Compute what kind of losses will occur when converting from one specific
3283 * pixel format to another.
3284 * When converting from one pixel format to another, information loss may occur.
3285 * For example, when converting from RGB24 to GRAY, the color information will
3286 * be lost. Similarly, other losses occur when converting from some formats to
3287 * other formats. These losses can involve loss of chroma, but also loss of
3288 * resolution, loss of color depth, loss due to the color space conversion, loss
3289 * of the alpha bits or loss due to color quantization.
3290 * avcodec_get_fix_fmt_loss() informs you about the various types of losses
3291 * which will occur when converting from one pixel format to another.
3293 * @param[in] dst_pix_fmt destination pixel format
3294 * @param[in] src_pix_fmt source pixel format
3295 * @param[in] has_alpha Whether the source pixel format alpha channel is used.
3296 * @return Combination of flags informing you what kind of losses will occur.
3298 int avcodec_get_pix_fmt_loss(enum PixelFormat dst_pix_fmt, enum PixelFormat src_pix_fmt,
3302 * Find the best pixel format to convert to given a certain source pixel
3303 * format. When converting from one pixel format to another, information loss
3304 * may occur. For example, when converting from RGB24 to GRAY, the color
3305 * information will be lost. Similarly, other losses occur when converting from
3306 * some formats to other formats. avcodec_find_best_pix_fmt() searches which of
3307 * the given pixel formats should be used to suffer the least amount of loss.
3308 * The pixel formats from which it chooses one, are determined by the
3309 * pix_fmt_mask parameter.
3312 * src_pix_fmt = PIX_FMT_YUV420P;
3313 * pix_fmt_mask = (1 << PIX_FMT_YUV422P) || (1 << PIX_FMT_RGB24);
3314 * dst_pix_fmt = avcodec_find_best_pix_fmt(pix_fmt_mask, src_pix_fmt, alpha, &loss);
3317 * @param[in] pix_fmt_mask bitmask determining which pixel format to choose from
3318 * @param[in] src_pix_fmt source pixel format
3319 * @param[in] has_alpha Whether the source pixel format alpha channel is used.
3320 * @param[out] loss_ptr Combination of flags informing you what kind of losses will occur.
3321 * @return The best pixel format to convert to or -1 if none was found.
3323 enum PixelFormat avcodec_find_best_pix_fmt(int64_t pix_fmt_mask, enum PixelFormat src_pix_fmt,
3324 int has_alpha, int *loss_ptr);
3326 /* deinterlace a picture */
3327 /* deinterlace - if not supported return -1 */
3328 int avpicture_deinterlace(AVPicture *dst, const AVPicture *src,
3329 enum PixelFormat pix_fmt, int width, int height);
3331 /* external high level API */
3334 * If c is NULL, returns the first registered codec,
3335 * if c is non-NULL, returns the next registered codec after c,
3336 * or NULL if c is the last one.
3338 AVCodec *av_codec_next(AVCodec *c);
3341 * Return the LIBAVCODEC_VERSION_INT constant.
3343 unsigned avcodec_version(void);
3346 * Return the libavcodec build-time configuration.
3348 const char *avcodec_configuration(void);
3351 * Return the libavcodec license.
3353 const char *avcodec_license(void);
3356 * Register the codec codec and initialize libavcodec.
3358 * @warning either this function or avcodec_register_all() must be called
3359 * before any other libavcodec functions.
3361 * @see avcodec_register_all()
3363 void avcodec_register(AVCodec *codec);
3366 * Find a registered encoder with a matching codec ID.
3368 * @param id CodecID of the requested encoder
3369 * @return An encoder if one was found, NULL otherwise.
3371 AVCodec *avcodec_find_encoder(enum CodecID id);
3374 * Find a registered encoder with the specified name.
3376 * @param name name of the requested encoder
3377 * @return An encoder if one was found, NULL otherwise.
3379 AVCodec *avcodec_find_encoder_by_name(const char *name);
3382 * Find a registered decoder with a matching codec ID.
3384 * @param id CodecID of the requested decoder
3385 * @return A decoder if one was found, NULL otherwise.
3387 AVCodec *avcodec_find_decoder(enum CodecID id);
3390 * Find a registered decoder with the specified name.
3392 * @param name name of the requested decoder
3393 * @return A decoder if one was found, NULL otherwise.
3395 AVCodec *avcodec_find_decoder_by_name(const char *name);
3396 void avcodec_string(char *buf, int buf_size, AVCodecContext *enc, int encode);
3399 * Return a name for the specified profile, if available.
3401 * @param codec the codec that is searched for the given profile
3402 * @param profile the profile value for which a name is requested
3403 * @return A name for the profile if found, NULL otherwise.
3405 const char *av_get_profile_name(const AVCodec *codec, int profile);
3408 * Set the fields of the given AVCodecContext to default values corresponding
3409 * to the given codec (defaults may be codec-dependent).
3411 * Do not call this function if a non-NULL codec has been passed
3412 * to avcodec_alloc_context3() that allocated this AVCodecContext.
3413 * If codec is non-NULL, it is illegal to call avcodec_open2() with a
3414 * different codec on this AVCodecContext.
3416 int avcodec_get_context_defaults3(AVCodecContext *s, AVCodec *codec);
3419 * Allocate an AVCodecContext and set its fields to default values. The
3420 * resulting struct can be deallocated by simply calling av_free().
3422 * @param codec if non-NULL, allocate private data and initialize defaults
3423 * for the given codec. It is illegal to then call avcodec_open2()
3424 * with a different codec.
3426 * @return An AVCodecContext filled with default values or NULL on failure.
3427 * @see avcodec_get_context_defaults
3429 AVCodecContext *avcodec_alloc_context3(AVCodec *codec);
3432 * Copy the settings of the source AVCodecContext into the destination
3433 * AVCodecContext. The resulting destination codec context will be
3434 * unopened, i.e. you are required to call avcodec_open2() before you
3435 * can use this AVCodecContext to decode/encode video/audio data.
3437 * @param dest target codec context, should be initialized with
3438 * avcodec_alloc_context3(), but otherwise uninitialized
3439 * @param src source codec context
3440 * @return AVERROR() on error (e.g. memory allocation error), 0 on success
3442 int avcodec_copy_context(AVCodecContext *dest, const AVCodecContext *src);
3445 * Set the fields of the given AVFrame to default values.
3447 * @param pic The AVFrame of which the fields should be set to default values.
3449 void avcodec_get_frame_defaults(AVFrame *pic);
3452 * Allocate an AVFrame and set its fields to default values. The resulting
3453 * struct can be deallocated by simply calling av_free().
3455 * @return An AVFrame filled with default values or NULL on failure.
3456 * @see avcodec_get_frame_defaults
3458 AVFrame *avcodec_alloc_frame(void);
3460 int avcodec_default_get_buffer(AVCodecContext *s, AVFrame *pic);
3461 void avcodec_default_release_buffer(AVCodecContext *s, AVFrame *pic);
3462 int avcodec_default_reget_buffer(AVCodecContext *s, AVFrame *pic);
3465 * Return the amount of padding in pixels which the get_buffer callback must
3466 * provide around the edge of the image for codecs which do not have the
3467 * CODEC_FLAG_EMU_EDGE flag.
3469 * @return Required padding in pixels.
3471 unsigned avcodec_get_edge_width(void);
3473 * Modify width and height values so that they will result in a memory
3474 * buffer that is acceptable for the codec if you do not use any horizontal
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_dimensions(AVCodecContext *s, int *width, int *height);
3483 * Modify width and height values so that they will result in a memory
3484 * buffer that is acceptable for the codec if you also ensure that all
3485 * line sizes are a multiple of the respective linesize_align[i].
3487 * May only be used if a codec with CODEC_CAP_DR1 has been opened.
3488 * If CODEC_FLAG_EMU_EDGE is not set, the dimensions must have been increased
3489 * according to avcodec_get_edge_width() before.
3491 void avcodec_align_dimensions2(AVCodecContext *s, int *width, int *height,
3492 int linesize_align[AV_NUM_DATA_POINTERS]);
3494 enum PixelFormat avcodec_default_get_format(struct AVCodecContext *s, const enum PixelFormat * fmt);
3496 int avcodec_default_execute(AVCodecContext *c, int (*func)(AVCodecContext *c2, void *arg2),void *arg, int *ret, int count, int size);
3497 int avcodec_default_execute2(AVCodecContext *c, int (*func)(AVCodecContext *c2, void *arg2, int, int),void *arg, int *ret, int count);
3498 //FIXME func typedef
3501 * Initialize the AVCodecContext to use the given AVCodec. Prior to using this
3502 * function the context has to be allocated with avcodec_alloc_context3().
3504 * The functions avcodec_find_decoder_by_name(), avcodec_find_encoder_by_name(),
3505 * avcodec_find_decoder() and avcodec_find_encoder() provide an easy way for
3506 * retrieving a codec.
3508 * @warning This function is not thread safe!
3511 * avcodec_register_all();
3512 * av_dict_set(&opts, "b", "2.5M", 0);
3513 * codec = avcodec_find_decoder(CODEC_ID_H264);
3517 * context = avcodec_alloc_context3(codec);
3519 * if (avcodec_open2(context, codec, opts) < 0)
3523 * @param avctx The context to initialize.
3524 * @param options A dictionary filled with AVCodecContext and codec-private options.
3525 * On return this object will be filled with options that were not found.
3527 * @return zero on success, a negative value on error
3528 * @see avcodec_alloc_context3(), avcodec_find_decoder(), avcodec_find_encoder(),
3529 * av_dict_set(), av_opt_find().
3531 int avcodec_open2(AVCodecContext *avctx, AVCodec *codec, AVDictionary **options);
3533 #if FF_API_OLD_DECODE_AUDIO
3535 * Wrapper function which calls avcodec_decode_audio4.
3537 * @deprecated Use avcodec_decode_audio4 instead.
3539 * Decode the audio frame of size avpkt->size from avpkt->data into samples.
3540 * Some decoders may support multiple frames in a single AVPacket, such
3541 * decoders would then just decode the first frame. In this case,
3542 * avcodec_decode_audio3 has to be called again with an AVPacket that contains
3543 * the remaining data in order to decode the second frame etc.
3545 * could be outputted, frame_size_ptr is zero. Otherwise, it is the
3546 * decompressed frame size in bytes.
3548 * @warning You must set frame_size_ptr to the allocated size of the
3549 * output buffer before calling avcodec_decode_audio3().
3551 * @warning The input buffer must be FF_INPUT_BUFFER_PADDING_SIZE larger than
3552 * the actual read bytes because some optimized bitstream readers read 32 or 64
3553 * bits at once and could read over the end.
3555 * @warning The end of the input buffer avpkt->data should be set to 0 to ensure that
3556 * no overreading happens for damaged MPEG streams.
3558 * @warning You must not provide a custom get_buffer() when using
3559 * avcodec_decode_audio3(). Doing so will override it with
3560 * avcodec_default_get_buffer. Use avcodec_decode_audio4() instead,
3561 * which does allow the application to provide a custom get_buffer().
3563 * @note You might have to align the input buffer avpkt->data and output buffer
3564 * samples. The alignment requirements depend on the CPU: On some CPUs it isn't
3565 * necessary at all, on others it won't work at all if not aligned and on others
3566 * it will work but it will have an impact on performance.
3568 * In practice, avpkt->data should have 4 byte alignment at minimum and
3569 * samples should be 16 byte aligned unless the CPU doesn't need it
3570 * (AltiVec and SSE do).
3572 * @note Codecs which have the CODEC_CAP_DELAY capability set have a delay
3573 * between input and output, these need to be fed with avpkt->data=NULL,
3574 * avpkt->size=0 at the end to return the remaining frames.
3576 * @param avctx the codec context
3577 * @param[out] samples the output buffer, sample type in avctx->sample_fmt
3578 * If the sample format is planar, each channel plane will
3579 * be the same size, with no padding between channels.
3580 * @param[in,out] frame_size_ptr the output buffer size in bytes
3581 * @param[in] avpkt The input AVPacket containing the input buffer.
3582 * You can create such packet with av_init_packet() and by then setting
3583 * data and size, some decoders might in addition need other fields.
3584 * All decoders are designed to use the least fields possible though.
3585 * @return On error a negative value is returned, otherwise the number of bytes
3586 * used or zero if no frame data was decompressed (used) from the input AVPacket.
3588 attribute_deprecated int avcodec_decode_audio3(AVCodecContext *avctx, int16_t *samples,
3589 int *frame_size_ptr,
3594 * Decode the audio frame of size avpkt->size from avpkt->data into frame.
3596 * Some decoders may support multiple frames in a single AVPacket. Such
3597 * decoders would then just decode the first frame. In this case,
3598 * avcodec_decode_audio4 has to be called again with an AVPacket containing
3599 * the remaining data in order to decode the second frame, etc...
3600 * Even if no frames are returned, the packet needs to be fed to the decoder
3601 * with remaining data until it is completely consumed or an error occurs.
3603 * @warning The input buffer, avpkt->data must be FF_INPUT_BUFFER_PADDING_SIZE
3604 * larger than the actual read bytes because some optimized bitstream
3605 * readers read 32 or 64 bits at once and could read over the end.
3607 * @note You might have to align the input buffer. The alignment requirements
3608 * depend on the CPU and the decoder.
3610 * @param avctx the codec context
3611 * @param[out] frame The AVFrame in which to store decoded audio samples.
3612 * Decoders request a buffer of a particular size by setting
3613 * AVFrame.nb_samples prior to calling get_buffer(). The
3614 * decoder may, however, only utilize part of the buffer by
3615 * setting AVFrame.nb_samples to a smaller value in the
3617 * @param[out] got_frame_ptr Zero if no frame could be decoded, otherwise it is
3619 * @param[in] avpkt The input AVPacket containing the input buffer.
3620 * At least avpkt->data and avpkt->size should be set. Some
3621 * decoders might also require additional fields to be set.
3622 * @return A negative error code is returned if an error occurred during
3623 * decoding, otherwise the number of bytes consumed from the input
3624 * AVPacket is returned.
3626 int avcodec_decode_audio4(AVCodecContext *avctx, AVFrame *frame,
3627 int *got_frame_ptr, AVPacket *avpkt);
3630 * Decode the video frame of size avpkt->size from avpkt->data into picture.
3631 * Some decoders may support multiple frames in a single AVPacket, such
3632 * decoders would then just decode the first frame.
3634 * @warning The input buffer must be FF_INPUT_BUFFER_PADDING_SIZE larger than
3635 * the actual read bytes because some optimized bitstream readers read 32 or 64
3636 * bits at once and could read over the end.
3638 * @warning The end of the input buffer buf should be set to 0 to ensure that
3639 * no overreading happens for damaged MPEG streams.
3641 * @note You might have to align the input buffer avpkt->data.
3642 * The alignment requirements depend on the CPU: on some CPUs it isn't
3643 * necessary at all, on others it won't work at all if not aligned and on others
3644 * it will work but it will have an impact on performance.
3646 * In practice, avpkt->data should have 4 byte alignment at minimum.
3648 * @note Codecs which have the CODEC_CAP_DELAY capability set have a delay
3649 * between input and output, these need to be fed with avpkt->data=NULL,
3650 * avpkt->size=0 at the end to return the remaining frames.
3652 * @param avctx the codec context
3653 * @param[out] picture The AVFrame in which the decoded video frame will be stored.
3654 * Use avcodec_alloc_frame to get an AVFrame, the codec will
3655 * allocate memory for the actual bitmap.
3656 * with default get/release_buffer(), the decoder frees/reuses the bitmap as it sees fit.
3657 * with overridden get/release_buffer() (needs CODEC_CAP_DR1) the user decides into what buffer the decoder
3658 * decodes and the decoder tells the user once it does not need the data anymore,
3659 * the user app can at this point free/reuse/keep the memory as it sees fit.
3661 * @param[in] avpkt The input AVpacket containing the input buffer.
3662 * You can create such packet with av_init_packet() and by then setting
3663 * data and size, some decoders might in addition need other fields like
3664 * flags&AV_PKT_FLAG_KEY. All decoders are designed to use the least
3666 * @param[in,out] got_picture_ptr Zero if no frame could be decompressed, otherwise, it is nonzero.
3667 * @return On error a negative value is returned, otherwise the number of bytes
3668 * used or zero if no frame could be decompressed.
3670 int avcodec_decode_video2(AVCodecContext *avctx, AVFrame *picture,
3671 int *got_picture_ptr,
3675 * Decode a subtitle message.
3676 * Return a negative value on error, otherwise return the number of bytes used.
3677 * If no subtitle could be decompressed, got_sub_ptr is zero.
3678 * Otherwise, the subtitle is stored in *sub.
3679 * Note that CODEC_CAP_DR1 is not available for subtitle codecs. This is for
3680 * simplicity, because the performance difference is expect to be negligible
3681 * and reusing a get_buffer written for video codecs would probably perform badly
3682 * due to a potentially very different allocation pattern.
3684 * @param avctx the codec context
3685 * @param[out] sub The AVSubtitle in which the decoded subtitle will be stored, must be
3686 freed with avsubtitle_free if *got_sub_ptr is set.
3687 * @param[in,out] got_sub_ptr Zero if no subtitle could be decompressed, otherwise, it is nonzero.
3688 * @param[in] avpkt The input AVPacket containing the input buffer.
3690 int avcodec_decode_subtitle2(AVCodecContext *avctx, AVSubtitle *sub,
3695 * Free all allocated data in the given subtitle struct.
3697 * @param sub AVSubtitle to free.
3699 void avsubtitle_free(AVSubtitle *sub);
3701 #if FF_API_OLD_ENCODE_AUDIO
3703 * Encode an audio frame from samples into buf.
3705 * @deprecated Use avcodec_encode_audio2 instead.
3707 * @note The output buffer should be at least FF_MIN_BUFFER_SIZE bytes large.
3708 * However, for codecs with avctx->frame_size equal to 0 (e.g. PCM) the user
3709 * will know how much space is needed because it depends on the value passed
3710 * in buf_size as described below. In that case a lower value can be used.
3712 * @param avctx the codec context
3713 * @param[out] buf the output buffer
3714 * @param[in] buf_size the output buffer size
3715 * @param[in] samples the input buffer containing the samples
3716 * The number of samples read from this buffer is frame_size*channels,
3717 * both of which are defined in avctx.
3718 * For codecs which have avctx->frame_size equal to 0 (e.g. PCM) the number of
3719 * samples read from samples is equal to:
3720 * buf_size * 8 / (avctx->channels * av_get_bits_per_sample(avctx->codec_id))
3721 * This also implies that av_get_bits_per_sample() must not return 0 for these
3723 * @return On error a negative value is returned, on success zero or the number
3724 * of bytes used to encode the data read from the input buffer.
3726 int attribute_deprecated avcodec_encode_audio(AVCodecContext *avctx,
3727 uint8_t *buf, int buf_size,
3728 const short *samples);
3732 * Encode a frame of audio.
3734 * Takes input samples from frame and writes the next output packet, if
3735 * available, to avpkt. The output packet does not necessarily contain data for
3736 * the most recent frame, as encoders can delay, split, and combine input frames
3737 * internally as needed.
3739 * @param avctx codec context
3740 * @param avpkt output AVPacket.
3741 * The user can supply an output buffer by setting
3742 * avpkt->data and avpkt->size prior to calling the
3743 * function, but if the size of the user-provided data is not
3744 * large enough, encoding will fail. All other AVPacket fields
3745 * will be reset by the encoder using av_init_packet(). If
3746 * avpkt->data is NULL, the encoder will allocate it.
3747 * The encoder will set avpkt->size to the size of the
3749 * @param[in] frame AVFrame containing the raw audio data to be encoded.
3750 * May be NULL when flushing an encoder that has the
3751 * CODEC_CAP_DELAY capability set.
3752 * There are 2 codec capabilities that affect the allowed
3753 * values of frame->nb_samples.
3754 * If CODEC_CAP_SMALL_LAST_FRAME is set, then only the final
3755 * frame may be smaller than avctx->frame_size, and all other
3756 * frames must be equal to avctx->frame_size.
3757 * If CODEC_CAP_VARIABLE_FRAME_SIZE is set, then each frame
3758 * can have any number of samples.
3759 * If neither is set, frame->nb_samples must be equal to
3760 * avctx->frame_size for all frames.
3761 * @param[out] got_packet_ptr This field is set to 1 by libavcodec if the
3762 * output packet is non-empty, and to 0 if it is
3763 * empty. If the function returns an error, the
3764 * packet can be assumed to be invalid, and the
3765 * value of got_packet_ptr is undefined and should
3767 * @return 0 on success, negative error code on failure
3769 int avcodec_encode_audio2(AVCodecContext *avctx, AVPacket *avpkt,
3770 const AVFrame *frame, int *got_packet_ptr);
3773 * Fill audio frame data and linesize.
3774 * AVFrame extended_data channel pointers are allocated if necessary for
3777 * @param frame the AVFrame
3778 * frame->nb_samples must be set prior to calling the
3779 * function. This function fills in frame->data,
3780 * frame->extended_data, frame->linesize[0].
3781 * @param nb_channels channel count
3782 * @param sample_fmt sample format
3783 * @param buf buffer to use for frame data
3784 * @param buf_size size of buffer
3785 * @param align plane size sample alignment
3786 * @return 0 on success, negative error code on failure
3788 int avcodec_fill_audio_frame(AVFrame *frame, int nb_channels,
3789 enum AVSampleFormat sample_fmt, const uint8_t *buf,
3790 int buf_size, int align);
3793 * Encode a video frame from pict into buf.
3794 * The input picture should be
3795 * stored using a specific format, namely avctx.pix_fmt.
3797 * @param avctx the codec context
3798 * @param[out] buf the output buffer for the bitstream of encoded frame
3799 * @param[in] buf_size the size of the output buffer in bytes
3800 * @param[in] pict the input picture to encode
3801 * @return On error a negative value is returned, on success zero or the number
3802 * of bytes used from the output buffer.
3804 int avcodec_encode_video(AVCodecContext *avctx, uint8_t *buf, int buf_size,
3805 const AVFrame *pict);
3806 int avcodec_encode_subtitle(AVCodecContext *avctx, uint8_t *buf, int buf_size,
3807 const AVSubtitle *sub);
3809 int avcodec_close(AVCodecContext *avctx);
3812 * Register all the codecs, parsers and bitstream filters which were enabled at
3813 * configuration time. If you do not call this function you can select exactly
3814 * which formats you want to support, by using the individual registration
3817 * @see avcodec_register
3818 * @see av_register_codec_parser
3819 * @see av_register_bitstream_filter
3821 void avcodec_register_all(void);
3824 * Flush buffers, should be called when seeking or when switching to a different stream.
3826 void avcodec_flush_buffers(AVCodecContext *avctx);
3828 void avcodec_default_free_buffers(AVCodecContext *s);
3830 /* misc useful functions */
3833 * Return codec bits per sample.
3835 * @param[in] codec_id the codec
3836 * @return Number of bits per sample or zero if unknown for the given codec.
3838 int av_get_bits_per_sample(enum CodecID codec_id);
3841 typedef struct AVCodecParserContext {
3843 struct AVCodecParser *parser;
3844 int64_t frame_offset; /* offset of the current frame */
3845 int64_t cur_offset; /* current offset
3846 (incremented by each av_parser_parse()) */
3847 int64_t next_frame_offset; /* offset of the next frame */
3849 int pict_type; /* XXX: Put it back in AVCodecContext. */
3851 * This field is used for proper frame duration computation in lavf.
3852 * It signals, how much longer the frame duration of the current frame
3853 * is compared to normal frame duration.
3855 * frame_duration = (1 + repeat_pict) * time_base
3857 * It is used by codecs like H.264 to display telecined material.
3859 int repeat_pict; /* XXX: Put it back in AVCodecContext. */
3860 int64_t pts; /* pts of the current frame */
3861 int64_t dts; /* dts of the current frame */
3866 int fetch_timestamp;
3868 #define AV_PARSER_PTS_NB 4
3869 int cur_frame_start_index;
3870 int64_t cur_frame_offset[AV_PARSER_PTS_NB];
3871 int64_t cur_frame_pts[AV_PARSER_PTS_NB];
3872 int64_t cur_frame_dts[AV_PARSER_PTS_NB];
3875 #define PARSER_FLAG_COMPLETE_FRAMES 0x0001
3876 #define PARSER_FLAG_ONCE 0x0002
3877 /// Set if the parser has a valid file offset
3878 #define PARSER_FLAG_FETCHED_OFFSET 0x0004
3880 int64_t offset; ///< byte offset from starting packet start
3881 int64_t cur_frame_end[AV_PARSER_PTS_NB];
3884 * Set by parser to 1 for key frames and 0 for non-key frames.
3885 * It is initialized to -1, so if the parser doesn't set this flag,
3886 * old-style fallback using AV_PICTURE_TYPE_I picture type as key frames
3892 * Time difference in stream time base units from the pts of this
3893 * packet to the point at which the output from the decoder has converged
3894 * independent from the availability of previous frames. That is, the
3895 * frames are virtually identical no matter if decoding started from
3896 * the very first frame or from this keyframe.
3897 * Is AV_NOPTS_VALUE if unknown.
3898 * This field is not the display duration of the current frame.
3899 * This field has no meaning if the packet does not have AV_PKT_FLAG_KEY
3902 * The purpose of this field is to allow seeking in streams that have no
3903 * keyframes in the conventional sense. It corresponds to the
3904 * recovery point SEI in H.264 and match_time_delta in NUT. It is also
3905 * essential for some types of subtitle streams to ensure that all
3906 * subtitles are correctly displayed after seeking.
3908 int64_t convergence_duration;
3910 // Timestamp generation support:
3912 * Synchronization point for start of timestamp generation.
3914 * Set to >0 for sync point, 0 for no sync point and <0 for undefined
3917 * For example, this corresponds to presence of H.264 buffering period
3923 * Offset of the current timestamp against last timestamp sync point in
3924 * units of AVCodecContext.time_base.
3926 * Set to INT_MIN when dts_sync_point unused. Otherwise, it must
3927 * contain a valid timestamp offset.
3929 * Note that the timestamp of sync point has usually a nonzero
3930 * dts_ref_dts_delta, which refers to the previous sync point. Offset of
3931 * the next frame after timestamp sync point will be usually 1.
3933 * For example, this corresponds to H.264 cpb_removal_delay.
3935 int dts_ref_dts_delta;
3938 * Presentation delay of current frame in units of AVCodecContext.time_base.
3940 * Set to INT_MIN when dts_sync_point unused. Otherwise, it must
3941 * contain valid non-negative timestamp delta (presentation time of a frame
3942 * must not lie in the past).
3944 * This delay represents the difference between decoding and presentation
3945 * time of the frame.
3947 * For example, this corresponds to H.264 dpb_output_delay.
3952 * Position of the packet in file.
3954 * Analogous to cur_frame_pts/dts
3956 int64_t cur_frame_pos[AV_PARSER_PTS_NB];
3959 * Byte position of currently parsed frame in stream.
3964 * Previous frame byte position.
3967 } AVCodecParserContext;
3969 typedef struct AVCodecParser {
3970 int codec_ids[5]; /* several codec IDs are permitted */
3972 int (*parser_init)(AVCodecParserContext *s);
3973 int (*parser_parse)(AVCodecParserContext *s,
3974 AVCodecContext *avctx,
3975 const uint8_t **poutbuf, int *poutbuf_size,
3976 const uint8_t *buf, int buf_size);
3977 void (*parser_close)(AVCodecParserContext *s);
3978 int (*split)(AVCodecContext *avctx, const uint8_t *buf, int buf_size);
3979 struct AVCodecParser *next;
3982 AVCodecParser *av_parser_next(AVCodecParser *c);
3984 void av_register_codec_parser(AVCodecParser *parser);
3985 AVCodecParserContext *av_parser_init(int codec_id);
3990 * @param s parser context.
3991 * @param avctx codec context.
3992 * @param poutbuf set to pointer to parsed buffer or NULL if not yet finished.
3993 * @param poutbuf_size set to size of parsed buffer or zero if not yet finished.
3994 * @param buf input buffer.
3995 * @param buf_size input length, to signal EOF, this should be 0 (so that the last frame can be output).
3996 * @param pts input presentation timestamp.
3997 * @param dts input decoding timestamp.
3998 * @param pos input byte position in stream.
3999 * @return the number of bytes of the input bitstream used.
4004 * len = av_parser_parse2(myparser, AVCodecContext, &data, &size,
4011 * decode_frame(data, size);
4015 int av_parser_parse2(AVCodecParserContext *s,
4016 AVCodecContext *avctx,
4017 uint8_t **poutbuf, int *poutbuf_size,
4018 const uint8_t *buf, int buf_size,
4019 int64_t pts, int64_t dts,
4022 int av_parser_change(AVCodecParserContext *s,
4023 AVCodecContext *avctx,
4024 uint8_t **poutbuf, int *poutbuf_size,
4025 const uint8_t *buf, int buf_size, int keyframe);
4026 void av_parser_close(AVCodecParserContext *s);
4029 typedef struct AVBitStreamFilterContext {
4031 struct AVBitStreamFilter *filter;
4032 AVCodecParserContext *parser;
4033 struct AVBitStreamFilterContext *next;
4034 } AVBitStreamFilterContext;
4037 typedef struct AVBitStreamFilter {
4040 int (*filter)(AVBitStreamFilterContext *bsfc,
4041 AVCodecContext *avctx, const char *args,
4042 uint8_t **poutbuf, int *poutbuf_size,
4043 const uint8_t *buf, int buf_size, int keyframe);
4044 void (*close)(AVBitStreamFilterContext *bsfc);
4045 struct AVBitStreamFilter *next;
4046 } AVBitStreamFilter;
4048 void av_register_bitstream_filter(AVBitStreamFilter *bsf);
4049 AVBitStreamFilterContext *av_bitstream_filter_init(const char *name);
4050 int av_bitstream_filter_filter(AVBitStreamFilterContext *bsfc,
4051 AVCodecContext *avctx, const char *args,
4052 uint8_t **poutbuf, int *poutbuf_size,
4053 const uint8_t *buf, int buf_size, int keyframe);
4054 void av_bitstream_filter_close(AVBitStreamFilterContext *bsf);
4056 AVBitStreamFilter *av_bitstream_filter_next(AVBitStreamFilter *f);
4061 * Reallocate the given block if it is not large enough, otherwise do nothing.
4065 void *av_fast_realloc(void *ptr, unsigned int *size, size_t min_size);
4068 * Allocate a buffer, reusing the given one if large enough.
4070 * Contrary to av_fast_realloc the current buffer contents might not be
4071 * preserved and on error the old buffer is freed, thus no special
4072 * handling to avoid memleaks is necessary.
4074 * @param ptr pointer to pointer to already allocated buffer, overwritten with pointer to new buffer
4075 * @param size size of the buffer *ptr points to
4076 * @param min_size minimum size of *ptr buffer after returning, *ptr will be NULL and
4077 * *size 0 if an error occurred.
4079 void av_fast_malloc(void *ptr, unsigned int *size, size_t min_size);
4082 * Copy image src to dst. Wraps av_picture_data_copy() above.
4084 void av_picture_copy(AVPicture *dst, const AVPicture *src,
4085 enum PixelFormat pix_fmt, int width, int height);
4088 * Crop image top and left side.
4090 int av_picture_crop(AVPicture *dst, const AVPicture *src,
4091 enum PixelFormat pix_fmt, int top_band, int left_band);
4096 int av_picture_pad(AVPicture *dst, const AVPicture *src, int height, int width, enum PixelFormat pix_fmt,
4097 int padtop, int padbottom, int padleft, int padright, int *color);
4100 * Encode extradata length to a buffer. Used by xiph codecs.
4102 * @param s buffer to write to; must be at least (v/255+1) bytes long
4103 * @param v size of extradata in bytes
4104 * @return number of bytes written to the buffer.
4106 unsigned int av_xiphlacing(unsigned char *s, unsigned int v);
4109 * Log a generic warning message about a missing feature. This function is
4110 * intended to be used internally by Libav (libavcodec, libavformat, etc.)
4111 * only, and would normally not be used by applications.
4112 * @param[in] avc a pointer to an arbitrary struct of which the first field is
4113 * a pointer to an AVClass struct
4114 * @param[in] feature string containing the name of the missing feature
4115 * @param[in] want_sample indicates if samples are wanted which exhibit this feature.
4116 * If want_sample is non-zero, additional verbage will be added to the log
4117 * message which tells the user how to report samples to the development
4120 void av_log_missing_feature(void *avc, const char *feature, int want_sample);
4123 * Log a generic warning message asking for a sample. This function is
4124 * intended to be used internally by Libav (libavcodec, libavformat, etc.)
4125 * only, and would normally not be used by applications.
4126 * @param[in] avc a pointer to an arbitrary struct of which the first field is
4127 * a pointer to an AVClass struct
4128 * @param[in] msg string containing an optional message, or NULL if no message
4130 void av_log_ask_for_sample(void *avc, const char *msg, ...) av_printf_format(2, 3);
4133 * Register the hardware accelerator hwaccel.
4135 void av_register_hwaccel(AVHWAccel *hwaccel);
4138 * If hwaccel is NULL, returns the first registered hardware accelerator,
4139 * if hwaccel is non-NULL, returns the next registered hardware accelerator
4140 * after hwaccel, or NULL if hwaccel is the last one.
4142 AVHWAccel *av_hwaccel_next(AVHWAccel *hwaccel);
4146 * Lock operation used by lockmgr
4149 AV_LOCK_CREATE, ///< Create a mutex
4150 AV_LOCK_OBTAIN, ///< Lock the mutex
4151 AV_LOCK_RELEASE, ///< Unlock the mutex
4152 AV_LOCK_DESTROY, ///< Free mutex resources
4156 * Register a user provided lock manager supporting the operations
4157 * specified by AVLockOp. mutex points to a (void *) where the
4158 * lockmgr should store/get a pointer to a user allocated mutex. It's
4159 * NULL upon AV_LOCK_CREATE and != NULL for all other ops.
4161 * @param cb User defined callback. Note: Libav may invoke calls to this
4162 * callback during the call to av_lockmgr_register().
4163 * Thus, the application must be prepared to handle that.
4164 * If cb is set to NULL the lockmgr will be unregistered.
4165 * Also note that during unregistration the previously registered
4166 * lockmgr callback may also be invoked.
4168 int av_lockmgr_register(int (*cb)(void **mutex, enum AVLockOp op));
4171 * Get the type of the given codec.
4173 enum AVMediaType avcodec_get_type(enum CodecID codec_id);
4176 * Get the AVClass for AVCodecContext. It can be used in combination with
4177 * AV_OPT_SEARCH_FAKE_OBJ for examining options.
4179 * @see av_opt_find().
4181 const AVClass *avcodec_get_class(void);
4183 #endif /* AVCODEC_AVCODEC_H */