2 * copyright (c) 2001 Fabrice Bellard
4 * This file is part of FFmpeg.
6 * FFmpeg is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
11 * FFmpeg is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with FFmpeg; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21 #ifndef AVCODEC_AVCODEC_H
22 #define AVCODEC_AVCODEC_H
27 * Libavcodec external API header
31 #include "libavutil/samplefmt.h"
32 #include "libavutil/attributes.h"
33 #include "libavutil/avutil.h"
34 #include "libavutil/buffer.h"
35 #include "libavutil/cpu.h"
36 #include "libavutil/channel_layout.h"
37 #include "libavutil/dict.h"
38 #include "libavutil/frame.h"
39 #include "libavutil/log.h"
40 #include "libavutil/pixfmt.h"
41 #include "libavutil/rational.h"
46 * @defgroup libavc Encoding/Decoding Library
49 * @defgroup lavc_decoding Decoding
53 * @defgroup lavc_encoding Encoding
57 * @defgroup lavc_codec Codecs
59 * @defgroup lavc_codec_native Native Codecs
62 * @defgroup lavc_codec_wrappers External library wrappers
65 * @defgroup lavc_codec_hwaccel Hardware Accelerators bridge
69 * @defgroup lavc_internal Internal
77 * @defgroup lavc_core Core functions/structures.
80 * Basic definitions, functions for querying libavcodec capabilities,
81 * allocating core structures, etc.
87 * Identify the syntax and semantics of the bitstream.
88 * The principle is roughly:
89 * Two decoders with the same ID can decode the same streams.
90 * Two encoders with the same ID can encode compatible streams.
91 * There may be slight deviations from the principle due to implementation
94 * If you add a codec ID to this list, add it so that
95 * 1. no value of a existing codec ID changes (that would break ABI),
96 * 2. it is as close as possible to similar codecs
98 * After adding new codec IDs, do not forget to add an entry to the codec
99 * descriptor list and bump libavcodec minor version.
105 AV_CODEC_ID_MPEG1VIDEO,
106 AV_CODEC_ID_MPEG2VIDEO, ///< preferred ID for MPEG-1/2 video decoding
108 AV_CODEC_ID_MPEG2VIDEO_XVMC,
109 #endif /* FF_API_XVMC */
120 AV_CODEC_ID_RAWVIDEO,
121 AV_CODEC_ID_MSMPEG4V1,
122 AV_CODEC_ID_MSMPEG4V2,
123 AV_CODEC_ID_MSMPEG4V3,
146 AV_CODEC_ID_INTERPLAY_VIDEO,
153 AV_CODEC_ID_MSVIDEO1,
158 AV_CODEC_ID_TRUEMOTION1,
159 AV_CODEC_ID_VMDVIDEO,
184 AV_CODEC_ID_TRUEMOTION2,
190 AV_CODEC_ID_SMACKVIDEO,
195 AV_CODEC_ID_JPEG2000,
201 AV_CODEC_ID_DSICINVIDEO,
202 AV_CODEC_ID_TIERTEXSEQVIDEO,
210 AV_CODEC_ID_BETHSOFTVID,
222 AV_CODEC_ID_ESCAPE124,
226 AV_CODEC_ID_MOTIONPIXELS,
238 AV_CODEC_ID_FLASHSV2,
239 AV_CODEC_ID_CDGRAPHICS,
242 AV_CODEC_ID_BINKVIDEO,
243 AV_CODEC_ID_IFF_ILBM,
244 #define AV_CODEC_ID_IFF_BYTERUN1 AV_CODEC_ID_IFF_ILBM
250 AV_CODEC_ID_A64_MULTI,
251 AV_CODEC_ID_A64_MULTI5,
254 AV_CODEC_ID_LAGARITH,
258 AV_CODEC_ID_WMV3IMAGE,
259 AV_CODEC_ID_VC1IMAGE,
261 AV_CODEC_ID_BMV_VIDEO,
268 AV_CODEC_ID_ZEROCODEC,
277 AV_CODEC_ID_ESCAPE130,
280 AV_CODEC_ID_HNM4_VIDEO,
282 #define AV_CODEC_ID_H265 AV_CODEC_ID_HEVC
284 AV_CODEC_ID_ALIAS_PIX,
285 AV_CODEC_ID_BRENDER_PIX,
286 AV_CODEC_ID_PAF_VIDEO,
299 AV_CODEC_ID_SCREENPRESSO,
302 AV_CODEC_ID_Y41P = 0x8000,
307 AV_CODEC_ID_TARGA_Y216,
319 /* various PCM "codecs" */
320 AV_CODEC_ID_FIRST_AUDIO = 0x10000, ///< A dummy id pointing at the start of audio codecs
321 AV_CODEC_ID_PCM_S16LE = 0x10000,
322 AV_CODEC_ID_PCM_S16BE,
323 AV_CODEC_ID_PCM_U16LE,
324 AV_CODEC_ID_PCM_U16BE,
327 AV_CODEC_ID_PCM_MULAW,
328 AV_CODEC_ID_PCM_ALAW,
329 AV_CODEC_ID_PCM_S32LE,
330 AV_CODEC_ID_PCM_S32BE,
331 AV_CODEC_ID_PCM_U32LE,
332 AV_CODEC_ID_PCM_U32BE,
333 AV_CODEC_ID_PCM_S24LE,
334 AV_CODEC_ID_PCM_S24BE,
335 AV_CODEC_ID_PCM_U24LE,
336 AV_CODEC_ID_PCM_U24BE,
337 AV_CODEC_ID_PCM_S24DAUD,
338 AV_CODEC_ID_PCM_ZORK,
339 AV_CODEC_ID_PCM_S16LE_PLANAR,
341 AV_CODEC_ID_PCM_F32BE,
342 AV_CODEC_ID_PCM_F32LE,
343 AV_CODEC_ID_PCM_F64BE,
344 AV_CODEC_ID_PCM_F64LE,
345 AV_CODEC_ID_PCM_BLURAY,
348 AV_CODEC_ID_PCM_S8_PLANAR,
349 AV_CODEC_ID_PCM_S24LE_PLANAR,
350 AV_CODEC_ID_PCM_S32LE_PLANAR,
351 AV_CODEC_ID_PCM_S16BE_PLANAR,
352 /* new PCM "codecs" should be added right below this line starting with
353 * an explicit value of for example 0x10800
356 /* various ADPCM codecs */
357 AV_CODEC_ID_ADPCM_IMA_QT = 0x11000,
358 AV_CODEC_ID_ADPCM_IMA_WAV,
359 AV_CODEC_ID_ADPCM_IMA_DK3,
360 AV_CODEC_ID_ADPCM_IMA_DK4,
361 AV_CODEC_ID_ADPCM_IMA_WS,
362 AV_CODEC_ID_ADPCM_IMA_SMJPEG,
363 AV_CODEC_ID_ADPCM_MS,
364 AV_CODEC_ID_ADPCM_4XM,
365 AV_CODEC_ID_ADPCM_XA,
366 AV_CODEC_ID_ADPCM_ADX,
367 AV_CODEC_ID_ADPCM_EA,
368 AV_CODEC_ID_ADPCM_G726,
369 AV_CODEC_ID_ADPCM_CT,
370 AV_CODEC_ID_ADPCM_SWF,
371 AV_CODEC_ID_ADPCM_YAMAHA,
372 AV_CODEC_ID_ADPCM_SBPRO_4,
373 AV_CODEC_ID_ADPCM_SBPRO_3,
374 AV_CODEC_ID_ADPCM_SBPRO_2,
375 AV_CODEC_ID_ADPCM_THP,
376 AV_CODEC_ID_ADPCM_IMA_AMV,
377 AV_CODEC_ID_ADPCM_EA_R1,
378 AV_CODEC_ID_ADPCM_EA_R3,
379 AV_CODEC_ID_ADPCM_EA_R2,
380 AV_CODEC_ID_ADPCM_IMA_EA_SEAD,
381 AV_CODEC_ID_ADPCM_IMA_EA_EACS,
382 AV_CODEC_ID_ADPCM_EA_XAS,
383 AV_CODEC_ID_ADPCM_EA_MAXIS_XA,
384 AV_CODEC_ID_ADPCM_IMA_ISS,
385 AV_CODEC_ID_ADPCM_G722,
386 AV_CODEC_ID_ADPCM_IMA_APC,
387 AV_CODEC_ID_ADPCM_VIMA,
388 #if FF_API_VIMA_DECODER
389 AV_CODEC_ID_VIMA = AV_CODEC_ID_ADPCM_VIMA,
392 AV_CODEC_ID_ADPCM_AFC = 0x11800,
393 AV_CODEC_ID_ADPCM_IMA_OKI,
394 AV_CODEC_ID_ADPCM_DTK,
395 AV_CODEC_ID_ADPCM_IMA_RAD,
396 AV_CODEC_ID_ADPCM_G726LE,
397 AV_CODEC_ID_ADPCM_THP_LE,
398 AV_CODEC_ID_ADPCM_PSX,
399 AV_CODEC_ID_ADPCM_AICA,
402 AV_CODEC_ID_AMR_NB = 0x12000,
405 /* RealAudio codecs*/
406 AV_CODEC_ID_RA_144 = 0x13000,
409 /* various DPCM codecs */
410 AV_CODEC_ID_ROQ_DPCM = 0x14000,
411 AV_CODEC_ID_INTERPLAY_DPCM,
412 AV_CODEC_ID_XAN_DPCM,
413 AV_CODEC_ID_SOL_DPCM,
415 AV_CODEC_ID_SDX2_DPCM = 0x14800,
418 AV_CODEC_ID_MP2 = 0x15000,
419 AV_CODEC_ID_MP3, ///< preferred ID for decoding MPEG audio layer 1, 2 or 3
429 AV_CODEC_ID_VMDAUDIO,
435 AV_CODEC_ID_WESTWOOD_SND1,
436 AV_CODEC_ID_GSM, ///< as in Berlin toast format
439 AV_CODEC_ID_TRUESPEECH,
441 AV_CODEC_ID_SMACKAUDIO,
444 AV_CODEC_ID_DSICINAUDIO,
446 AV_CODEC_ID_MUSEPACK7,
448 AV_CODEC_ID_GSM_MS, /* as found in WAV */
454 AV_CODEC_ID_NELLYMOSER,
455 AV_CODEC_ID_MUSEPACK8,
457 AV_CODEC_ID_WMAVOICE,
459 AV_CODEC_ID_WMALOSSLESS,
468 AV_CODEC_ID_BINKAUDIO_RDFT,
469 AV_CODEC_ID_BINKAUDIO_DCT,
470 AV_CODEC_ID_AAC_LATM,
475 AV_CODEC_ID_8SVX_EXP,
476 AV_CODEC_ID_8SVX_FIB,
477 AV_CODEC_ID_BMV_AUDIO,
482 AV_CODEC_ID_COMFORT_NOISE,
484 AV_CODEC_ID_METASOUND,
485 AV_CODEC_ID_PAF_AUDIO,
489 AV_CODEC_ID_FFWAVESYNTH = 0x15800,
491 AV_CODEC_ID_SONIC_LS,
494 AV_CODEC_ID_DSD_LSBF,
495 AV_CODEC_ID_DSD_MSBF,
496 AV_CODEC_ID_DSD_LSBF_PLANAR,
497 AV_CODEC_ID_DSD_MSBF_PLANAR,
500 /* subtitle codecs */
501 AV_CODEC_ID_FIRST_SUBTITLE = 0x17000, ///< A dummy ID pointing at the start of subtitle codecs.
502 AV_CODEC_ID_DVD_SUBTITLE = 0x17000,
503 AV_CODEC_ID_DVB_SUBTITLE,
504 AV_CODEC_ID_TEXT, ///< raw UTF-8 text
507 AV_CODEC_ID_MOV_TEXT,
508 AV_CODEC_ID_HDMV_PGS_SUBTITLE,
509 AV_CODEC_ID_DVB_TELETEXT,
512 AV_CODEC_ID_MICRODVD = 0x17800,
516 AV_CODEC_ID_REALTEXT,
518 AV_CODEC_ID_SUBVIEWER1,
519 AV_CODEC_ID_SUBVIEWER,
526 AV_CODEC_ID_HDMV_TEXT_SUBTITLE,
528 /* other specific kind of codecs (generally used for attachments) */
529 AV_CODEC_ID_FIRST_UNKNOWN = 0x18000, ///< A dummy ID pointing at the start of various fake codecs.
530 AV_CODEC_ID_TTF = 0x18000,
532 AV_CODEC_ID_BINTEXT = 0x18800,
536 AV_CODEC_ID_SMPTE_KLV,
538 AV_CODEC_ID_TIMED_ID3,
539 AV_CODEC_ID_BIN_DATA,
542 AV_CODEC_ID_PROBE = 0x19000, ///< codec_id is not known (like AV_CODEC_ID_NONE) but lavf should attempt to identify it
544 AV_CODEC_ID_MPEG2TS = 0x20000, /**< _FAKE_ codec to indicate a raw MPEG-2 TS
545 * stream (only used by libavformat) */
546 AV_CODEC_ID_MPEG4SYSTEMS = 0x20001, /**< _FAKE_ codec to indicate a MPEG-4 Systems
547 * stream (only used by libavformat) */
548 AV_CODEC_ID_FFMETADATA = 0x21000, ///< Dummy codec for streams containing only metadata information.
549 AV_CODEC_ID_WRAPPED_AVFRAME = 0x21001, ///< Passthrough codec, AVFrames wrapped in AVPacket
553 * This struct describes the properties of a single codec described by an
555 * @see avcodec_descriptor_get()
557 typedef struct AVCodecDescriptor {
559 enum AVMediaType type;
561 * Name of the codec described by this descriptor. It is non-empty and
562 * unique for each codec descriptor. It should contain alphanumeric
563 * characters and '_' only.
567 * A more descriptive name for this codec. May be NULL.
569 const char *long_name;
571 * Codec properties, a combination of AV_CODEC_PROP_* flags.
576 * MIME type(s) associated with the codec.
577 * May be NULL; if not, a NULL-terminated array of MIME types.
578 * The first item is always non-NULL and is the preferred MIME type.
580 const char *const *mime_types;
584 * Codec uses only intra compression.
587 #define AV_CODEC_PROP_INTRA_ONLY (1 << 0)
589 * Codec supports lossy compression. Audio and video codecs only.
590 * @note a codec may support both lossy and lossless
593 #define AV_CODEC_PROP_LOSSY (1 << 1)
595 * Codec supports lossless compression. Audio and video codecs only.
597 #define AV_CODEC_PROP_LOSSLESS (1 << 2)
599 * Codec supports frame reordering. That is, the coded order (the order in which
600 * the encoded packets are output by the encoders / stored / input to the
601 * decoders) may be different from the presentation order of the corresponding
604 * For codecs that do not have this property set, PTS and DTS should always be
607 #define AV_CODEC_PROP_REORDER (1 << 3)
609 * Subtitle codec is bitmap based
610 * Decoded AVSubtitle data can be read from the AVSubtitleRect->pict field.
612 #define AV_CODEC_PROP_BITMAP_SUB (1 << 16)
614 * Subtitle codec is text based.
615 * Decoded AVSubtitle data can be read from the AVSubtitleRect->ass field.
617 #define AV_CODEC_PROP_TEXT_SUB (1 << 17)
620 * @ingroup lavc_decoding
621 * Required number of additionally allocated bytes at the end of the input bitstream for decoding.
622 * This is mainly needed because some optimized bitstream readers read
623 * 32 or 64 bit at once and could read over the end.<br>
624 * Note: If the first 23 bits of the additional bytes are not 0, then damaged
625 * MPEG bitstreams could cause overread and segfault.
627 #define AV_INPUT_BUFFER_PADDING_SIZE 32
630 * @ingroup lavc_encoding
631 * minimum encoding buffer size
632 * Used to avoid some checks during header writing.
634 #define AV_INPUT_BUFFER_MIN_SIZE 16384
636 #if FF_API_WITHOUT_PREFIX
638 * @deprecated use AV_INPUT_BUFFER_PADDING_SIZE instead
640 #define FF_INPUT_BUFFER_PADDING_SIZE 32
643 * @deprecated use AV_INPUT_BUFFER_MIN_SIZE instead
645 #define FF_MIN_BUFFER_SIZE 16384
646 #endif /* FF_API_WITHOUT_PREFIX */
649 * @ingroup lavc_encoding
650 * motion estimation type.
651 * @deprecated use codec private option instead
653 #if FF_API_MOTION_EST
655 ME_ZERO = 1, ///< no search, that is use 0,0 vector whenever one is needed
659 ME_EPZS, ///< enhanced predictive zonal search
660 ME_X1, ///< reserved for experiments
661 ME_HEX, ///< hexagon based search
662 ME_UMH, ///< uneven multi-hexagon search
663 ME_TESA, ///< transformed exhaustive search algorithm
664 ME_ITER=50, ///< iterative search
669 * @ingroup lavc_decoding
672 /* We leave some space between them for extensions (drop some
673 * keyframes for intra-only or drop just some bidir frames). */
674 AVDISCARD_NONE =-16, ///< discard nothing
675 AVDISCARD_DEFAULT = 0, ///< discard useless packets like 0 size packets in avi
676 AVDISCARD_NONREF = 8, ///< discard all non reference
677 AVDISCARD_BIDIR = 16, ///< discard all bidirectional frames
678 AVDISCARD_NONINTRA= 24, ///< discard all non intra frames
679 AVDISCARD_NONKEY = 32, ///< discard all frames except keyframes
680 AVDISCARD_ALL = 48, ///< discard all
683 enum AVAudioServiceType {
684 AV_AUDIO_SERVICE_TYPE_MAIN = 0,
685 AV_AUDIO_SERVICE_TYPE_EFFECTS = 1,
686 AV_AUDIO_SERVICE_TYPE_VISUALLY_IMPAIRED = 2,
687 AV_AUDIO_SERVICE_TYPE_HEARING_IMPAIRED = 3,
688 AV_AUDIO_SERVICE_TYPE_DIALOGUE = 4,
689 AV_AUDIO_SERVICE_TYPE_COMMENTARY = 5,
690 AV_AUDIO_SERVICE_TYPE_EMERGENCY = 6,
691 AV_AUDIO_SERVICE_TYPE_VOICE_OVER = 7,
692 AV_AUDIO_SERVICE_TYPE_KARAOKE = 8,
693 AV_AUDIO_SERVICE_TYPE_NB , ///< Not part of ABI
697 * @ingroup lavc_encoding
699 typedef struct RcOverride{
702 int qscale; // If this is 0 then quality_factor will be used instead.
703 float quality_factor;
706 #if FF_API_MAX_BFRAMES
708 * @deprecated there is no libavcodec-wide limit on the number of B-frames
710 #define FF_MAX_B_FRAMES 16
714 These flags can be passed in AVCodecContext.flags before initialization.
715 Note: Not everything is supported yet.
719 * Allow decoders to produce frames with data planes that are not aligned
720 * to CPU requirements (e.g. due to cropping).
722 #define AV_CODEC_FLAG_UNALIGNED (1 << 0)
726 #define AV_CODEC_FLAG_QSCALE (1 << 1)
728 * 4 MV per MB allowed / advanced prediction for H.263.
730 #define AV_CODEC_FLAG_4MV (1 << 2)
732 * Output even those frames that might be corrupted.
734 #define AV_CODEC_FLAG_OUTPUT_CORRUPT (1 << 3)
738 #define AV_CODEC_FLAG_QPEL (1 << 4)
740 * Use internal 2pass ratecontrol in first pass mode.
742 #define AV_CODEC_FLAG_PASS1 (1 << 9)
744 * Use internal 2pass ratecontrol in second pass mode.
746 #define AV_CODEC_FLAG_PASS2 (1 << 10)
750 #define AV_CODEC_FLAG_LOOP_FILTER (1 << 11)
752 * Only decode/encode grayscale.
754 #define AV_CODEC_FLAG_GRAY (1 << 13)
756 * error[?] variables will be set during encoding.
758 #define AV_CODEC_FLAG_PSNR (1 << 15)
760 * Input bitstream might be truncated at a random location
761 * instead of only at frame boundaries.
763 #define AV_CODEC_FLAG_TRUNCATED (1 << 16)
765 * Use interlaced DCT.
767 #define AV_CODEC_FLAG_INTERLACED_DCT (1 << 18)
771 #define AV_CODEC_FLAG_LOW_DELAY (1 << 19)
773 * Place global headers in extradata instead of every keyframe.
775 #define AV_CODEC_FLAG_GLOBAL_HEADER (1 << 22)
777 * Use only bitexact stuff (except (I)DCT).
779 #define AV_CODEC_FLAG_BITEXACT (1 << 23)
780 /* Fx : Flag for h263+ extra options */
782 * H.263 advanced intra coding / MPEG-4 AC prediction
784 #define AV_CODEC_FLAG_AC_PRED (1 << 24)
786 * interlaced motion estimation
788 #define AV_CODEC_FLAG_INTERLACED_ME (1 << 29)
790 * Allow non spec compliant speedup tricks.
792 #define AV_CODEC_FLAG_CLOSED_GOP (1U << 31)
794 #define AV_CODEC_FLAG2_FAST (1 << 0)
796 * Skip bitstream encoding.
798 #define AV_CODEC_FLAG2_NO_OUTPUT (1 << 2)
800 * Place global headers at every keyframe instead of in extradata.
802 #define AV_CODEC_FLAG2_LOCAL_HEADER (1 << 3)
805 * timecode is in drop frame format. DEPRECATED!!!!
807 #define AV_CODEC_FLAG2_DROP_FRAME_TIMECODE (1 << 13)
810 * Input bitstream might be truncated at a packet boundaries
811 * instead of only at frame boundaries.
813 #define AV_CODEC_FLAG2_CHUNKS (1 << 15)
815 * Discard cropping information from SPS.
817 #define AV_CODEC_FLAG2_IGNORE_CROP (1 << 16)
820 * Show all frames before the first keyframe
822 #define AV_CODEC_FLAG2_SHOW_ALL (1 << 22)
824 * Export motion vectors through frame side data
826 #define AV_CODEC_FLAG2_EXPORT_MVS (1 << 28)
828 * Do not skip samples and export skip information as frame side data
830 #define AV_CODEC_FLAG2_SKIP_MANUAL (1 << 29)
832 /* Unsupported options :
833 * Syntax Arithmetic coding (SAC)
834 * Reference Picture Selection
835 * Independent Segment Decoding */
837 /* codec capabilities */
840 * Decoder can use draw_horiz_band callback.
842 #define AV_CODEC_CAP_DRAW_HORIZ_BAND (1 << 0)
844 * Codec uses get_buffer() for allocating buffers and supports custom allocators.
845 * If not set, it might not use get_buffer() at all or use operations that
846 * assume the buffer was allocated by avcodec_default_get_buffer.
848 #define AV_CODEC_CAP_DR1 (1 << 1)
849 #define AV_CODEC_CAP_TRUNCATED (1 << 3)
851 * Encoder or decoder requires flushing with NULL input at the end in order to
852 * give the complete and correct output.
854 * NOTE: If this flag is not set, the codec is guaranteed to never be fed with
855 * with NULL data. The user can still send NULL data to the public encode
856 * or decode function, but libavcodec will not pass it along to the codec
857 * unless this flag is set.
860 * The decoder has a non-zero delay and needs to be fed with avpkt->data=NULL,
861 * avpkt->size=0 at the end to get the delayed data until the decoder no longer
865 * The encoder needs to be fed with NULL data at the end of encoding until the
866 * encoder no longer returns data.
868 * NOTE: For encoders implementing the AVCodec.encode2() function, setting this
869 * flag also means that the encoder must set the pts and duration for
870 * each output packet. If this flag is not set, the pts and duration will
871 * be determined by libavcodec from the input frame.
873 #define AV_CODEC_CAP_DELAY (1 << 5)
875 * Codec can be fed a final frame with a smaller size.
876 * This can be used to prevent truncation of the last audio samples.
878 #define AV_CODEC_CAP_SMALL_LAST_FRAME (1 << 6)
882 * Codec can export data for HW decoding (VDPAU).
884 #define AV_CODEC_CAP_HWACCEL_VDPAU (1 << 7)
888 * Codec can output multiple frames per AVPacket
889 * Normally demuxers return one frame at a time, demuxers which do not do
890 * are connected to a parser to split what they return into proper frames.
891 * This flag is reserved to the very rare category of codecs which have a
892 * bitstream that cannot be split into frames without timeconsuming
893 * operations like full decoding. Demuxers carring such bitstreams thus
894 * may return multiple frames in a packet. This has many disadvantages like
895 * prohibiting stream copy in many cases thus it should only be considered
898 #define AV_CODEC_CAP_SUBFRAMES (1 << 8)
900 * Codec is experimental and is thus avoided in favor of non experimental
903 #define AV_CODEC_CAP_EXPERIMENTAL (1 << 9)
905 * Codec should fill in channel configuration and samplerate instead of container
907 #define AV_CODEC_CAP_CHANNEL_CONF (1 << 10)
909 * Codec supports frame-level multithreading.
911 #define AV_CODEC_CAP_FRAME_THREADS (1 << 12)
913 * Codec supports slice-based (or partition-based) multithreading.
915 #define AV_CODEC_CAP_SLICE_THREADS (1 << 13)
917 * Codec supports changed parameters at any point.
919 #define AV_CODEC_CAP_PARAM_CHANGE (1 << 14)
921 * Codec supports avctx->thread_count == 0 (auto).
923 #define AV_CODEC_CAP_AUTO_THREADS (1 << 15)
925 * Audio encoder supports receiving a different number of samples in each call.
927 #define AV_CODEC_CAP_VARIABLE_FRAME_SIZE (1 << 16)
929 * Codec is intra only.
931 #define AV_CODEC_CAP_INTRA_ONLY 0x40000000
935 #define AV_CODEC_CAP_LOSSLESS 0x80000000
938 #if FF_API_WITHOUT_PREFIX
940 * Allow decoders to produce frames with data planes that are not aligned
941 * to CPU requirements (e.g. due to cropping).
943 #define CODEC_FLAG_UNALIGNED AV_CODEC_FLAG_UNALIGNED
944 #define CODEC_FLAG_QSCALE AV_CODEC_FLAG_QSCALE
945 #define CODEC_FLAG_4MV AV_CODEC_FLAG_4MV
946 #define CODEC_FLAG_OUTPUT_CORRUPT AV_CODEC_FLAG_OUTPUT_CORRUPT
947 #define CODEC_FLAG_QPEL AV_CODEC_FLAG_QPEL
950 * @deprecated use the "gmc" private option of the libxvid encoder
952 #define CODEC_FLAG_GMC 0x0020 ///< Use GMC.
956 * @deprecated use the flag "mv0" in the "mpv_flags" private option of the
959 #define CODEC_FLAG_MV0 0x0040
961 #if FF_API_INPUT_PRESERVED
963 * @deprecated passing reference-counted frames to the encoders replaces this
966 #define CODEC_FLAG_INPUT_PRESERVED 0x0100
968 #define CODEC_FLAG_PASS1 AV_CODEC_FLAG_PASS1
969 #define CODEC_FLAG_PASS2 AV_CODEC_FLAG_PASS2
970 #define CODEC_FLAG_GRAY AV_CODEC_FLAG_GRAY
973 * @deprecated edges are not used/required anymore. I.e. this flag is now always
976 #define CODEC_FLAG_EMU_EDGE 0x4000
978 #define CODEC_FLAG_PSNR AV_CODEC_FLAG_PSNR
979 #define CODEC_FLAG_TRUNCATED AV_CODEC_FLAG_TRUNCATED
981 #if FF_API_NORMALIZE_AQP
983 * @deprecated use the flag "naq" in the "mpv_flags" private option of the
986 #define CODEC_FLAG_NORMALIZE_AQP 0x00020000
988 #define CODEC_FLAG_INTERLACED_DCT AV_CODEC_FLAG_INTERLACED_DCT
989 #define CODEC_FLAG_LOW_DELAY AV_CODEC_FLAG_LOW_DELAY
990 #define CODEC_FLAG_GLOBAL_HEADER AV_CODEC_FLAG_GLOBAL_HEADER
991 #define CODEC_FLAG_BITEXACT AV_CODEC_FLAG_BITEXACT
992 #define CODEC_FLAG_AC_PRED AV_CODEC_FLAG_AC_PRED
993 #define CODEC_FLAG_LOOP_FILTER AV_CODEC_FLAG_LOOP_FILTER
994 #define CODEC_FLAG_INTERLACED_ME AV_CODEC_FLAG_INTERLACED_ME
995 #define CODEC_FLAG_CLOSED_GOP AV_CODEC_FLAG_CLOSED_GOP
996 #define CODEC_FLAG2_FAST AV_CODEC_FLAG2_FAST
997 #define CODEC_FLAG2_NO_OUTPUT AV_CODEC_FLAG2_NO_OUTPUT
998 #define CODEC_FLAG2_LOCAL_HEADER AV_CODEC_FLAG2_LOCAL_HEADER
999 #define CODEC_FLAG2_DROP_FRAME_TIMECODE AV_CODEC_FLAG2_DROP_FRAME_TIMECODE
1000 #define CODEC_FLAG2_IGNORE_CROP AV_CODEC_FLAG2_IGNORE_CROP
1002 #define CODEC_FLAG2_CHUNKS AV_CODEC_FLAG2_CHUNKS
1003 #define CODEC_FLAG2_SHOW_ALL AV_CODEC_FLAG2_SHOW_ALL
1004 #define CODEC_FLAG2_EXPORT_MVS AV_CODEC_FLAG2_EXPORT_MVS
1005 #define CODEC_FLAG2_SKIP_MANUAL AV_CODEC_FLAG2_SKIP_MANUAL
1007 /* Unsupported options :
1008 * Syntax Arithmetic coding (SAC)
1009 * Reference Picture Selection
1010 * Independent Segment Decoding */
1012 /* codec capabilities */
1014 #define CODEC_CAP_DRAW_HORIZ_BAND AV_CODEC_CAP_DRAW_HORIZ_BAND ///< Decoder can use draw_horiz_band callback.
1016 * Codec uses get_buffer() for allocating buffers and supports custom allocators.
1017 * If not set, it might not use get_buffer() at all or use operations that
1018 * assume the buffer was allocated by avcodec_default_get_buffer.
1020 #define CODEC_CAP_DR1 AV_CODEC_CAP_DR1
1021 #define CODEC_CAP_TRUNCATED AV_CODEC_CAP_TRUNCATED
1023 /* Codec can export data for HW decoding. This flag indicates that
1024 * the codec would call get_format() with list that might contain HW accelerated
1025 * pixel formats (XvMC, VDPAU, VAAPI, etc). The application can pick any of them
1026 * including raw image format.
1027 * The application can use the passed context to determine bitstream version,
1028 * chroma format, resolution etc.
1030 #define CODEC_CAP_HWACCEL 0x0010
1031 #endif /* FF_API_XVMC */
1033 * Encoder or decoder requires flushing with NULL input at the end in order to
1034 * give the complete and correct output.
1036 * NOTE: If this flag is not set, the codec is guaranteed to never be fed with
1037 * with NULL data. The user can still send NULL data to the public encode
1038 * or decode function, but libavcodec will not pass it along to the codec
1039 * unless this flag is set.
1042 * The decoder has a non-zero delay and needs to be fed with avpkt->data=NULL,
1043 * avpkt->size=0 at the end to get the delayed data until the decoder no longer
1047 * The encoder needs to be fed with NULL data at the end of encoding until the
1048 * encoder no longer returns data.
1050 * NOTE: For encoders implementing the AVCodec.encode2() function, setting this
1051 * flag also means that the encoder must set the pts and duration for
1052 * each output packet. If this flag is not set, the pts and duration will
1053 * be determined by libavcodec from the input frame.
1055 #define CODEC_CAP_DELAY AV_CODEC_CAP_DELAY
1057 * Codec can be fed a final frame with a smaller size.
1058 * This can be used to prevent truncation of the last audio samples.
1060 #define CODEC_CAP_SMALL_LAST_FRAME AV_CODEC_CAP_SMALL_LAST_FRAME
1061 #if FF_API_CAP_VDPAU
1063 * Codec can export data for HW decoding (VDPAU).
1065 #define CODEC_CAP_HWACCEL_VDPAU AV_CODEC_CAP_HWACCEL_VDPAU
1068 * Codec can output multiple frames per AVPacket
1069 * Normally demuxers return one frame at a time, demuxers which do not do
1070 * are connected to a parser to split what they return into proper frames.
1071 * This flag is reserved to the very rare category of codecs which have a
1072 * bitstream that cannot be split into frames without timeconsuming
1073 * operations like full decoding. Demuxers carring such bitstreams thus
1074 * may return multiple frames in a packet. This has many disadvantages like
1075 * prohibiting stream copy in many cases thus it should only be considered
1078 #define CODEC_CAP_SUBFRAMES AV_CODEC_CAP_SUBFRAMES
1080 * Codec is experimental and is thus avoided in favor of non experimental
1083 #define CODEC_CAP_EXPERIMENTAL AV_CODEC_CAP_EXPERIMENTAL
1085 * Codec should fill in channel configuration and samplerate instead of container
1087 #define CODEC_CAP_CHANNEL_CONF AV_CODEC_CAP_CHANNEL_CONF
1088 #if FF_API_NEG_LINESIZES
1090 * @deprecated no codecs use this capability
1092 #define CODEC_CAP_NEG_LINESIZES 0x0800
1095 * Codec supports frame-level multithreading.
1097 #define CODEC_CAP_FRAME_THREADS AV_CODEC_CAP_FRAME_THREADS
1099 * Codec supports slice-based (or partition-based) multithreading.
1101 #define CODEC_CAP_SLICE_THREADS AV_CODEC_CAP_SLICE_THREADS
1103 * Codec supports changed parameters at any point.
1105 #define CODEC_CAP_PARAM_CHANGE AV_CODEC_CAP_PARAM_CHANGE
1107 * Codec supports avctx->thread_count == 0 (auto).
1109 #define CODEC_CAP_AUTO_THREADS AV_CODEC_CAP_AUTO_THREADS
1111 * Audio encoder supports receiving a different number of samples in each call.
1113 #define CODEC_CAP_VARIABLE_FRAME_SIZE AV_CODEC_CAP_VARIABLE_FRAME_SIZE
1115 * Codec is intra only.
1117 #define CODEC_CAP_INTRA_ONLY AV_CODEC_CAP_INTRA_ONLY
1119 * Codec is lossless.
1121 #define CODEC_CAP_LOSSLESS AV_CODEC_CAP_LOSSLESS
1124 * HWAccel is experimental and is thus avoided in favor of non experimental
1127 #define HWACCEL_CODEC_CAP_EXPERIMENTAL 0x0200
1128 #endif /* FF_API_WITHOUT_PREFIX */
1131 //The following defines may change, don't expect compatibility if you use them.
1132 #define MB_TYPE_INTRA4x4 0x0001
1133 #define MB_TYPE_INTRA16x16 0x0002 //FIXME H.264-specific
1134 #define MB_TYPE_INTRA_PCM 0x0004 //FIXME H.264-specific
1135 #define MB_TYPE_16x16 0x0008
1136 #define MB_TYPE_16x8 0x0010
1137 #define MB_TYPE_8x16 0x0020
1138 #define MB_TYPE_8x8 0x0040
1139 #define MB_TYPE_INTERLACED 0x0080
1140 #define MB_TYPE_DIRECT2 0x0100 //FIXME
1141 #define MB_TYPE_ACPRED 0x0200
1142 #define MB_TYPE_GMC 0x0400
1143 #define MB_TYPE_SKIP 0x0800
1144 #define MB_TYPE_P0L0 0x1000
1145 #define MB_TYPE_P1L0 0x2000
1146 #define MB_TYPE_P0L1 0x4000
1147 #define MB_TYPE_P1L1 0x8000
1148 #define MB_TYPE_L0 (MB_TYPE_P0L0 | MB_TYPE_P1L0)
1149 #define MB_TYPE_L1 (MB_TYPE_P0L1 | MB_TYPE_P1L1)
1150 #define MB_TYPE_L0L1 (MB_TYPE_L0 | MB_TYPE_L1)
1151 #define MB_TYPE_QUANT 0x00010000
1152 #define MB_TYPE_CBP 0x00020000
1153 //Note bits 24-31 are reserved for codec specific use (h264 ref0, mpeg1 0mv, ...)
1158 * This specifies the area which should be displayed.
1159 * Note there may be multiple such areas for one frame.
1161 typedef struct AVPanScan{
1164 * - encoding: Set by user.
1165 * - decoding: Set by libavcodec.
1170 * width and height in 1/16 pel
1171 * - encoding: Set by user.
1172 * - decoding: Set by libavcodec.
1178 * position of the top left corner in 1/16 pel for up to 3 fields/frames
1179 * - encoding: Set by user.
1180 * - decoding: Set by libavcodec.
1182 int16_t position[3][2];
1185 #if FF_API_QSCALE_TYPE
1186 #define FF_QSCALE_TYPE_MPEG1 0
1187 #define FF_QSCALE_TYPE_MPEG2 1
1188 #define FF_QSCALE_TYPE_H264 2
1189 #define FF_QSCALE_TYPE_VP56 3
1193 * The decoder will keep a reference to the frame and may reuse it later.
1195 #define AV_GET_BUFFER_FLAG_REF (1 << 0)
1198 * @defgroup lavc_packet AVPacket
1200 * Types and functions for working with AVPacket.
1203 enum AVPacketSideDataType {
1204 AV_PKT_DATA_PALETTE,
1205 AV_PKT_DATA_NEW_EXTRADATA,
1208 * An AV_PKT_DATA_PARAM_CHANGE side data packet is laid out as follows:
1211 * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_COUNT)
1212 * s32le channel_count
1213 * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_LAYOUT)
1214 * u64le channel_layout
1215 * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_SAMPLE_RATE)
1217 * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_DIMENSIONS)
1222 AV_PKT_DATA_PARAM_CHANGE,
1225 * An AV_PKT_DATA_H263_MB_INFO side data packet contains a number of
1226 * structures with info about macroblocks relevant to splitting the
1227 * packet into smaller packets on macroblock edges (e.g. as for RFC 2190).
1228 * That is, it does not necessarily contain info about all macroblocks,
1229 * as long as the distance between macroblocks in the info is smaller
1230 * than the target payload size.
1231 * Each MB info structure is 12 bytes, and is laid out as follows:
1233 * u32le bit offset from the start of the packet
1234 * u8 current quantizer at the start of the macroblock
1236 * u16le macroblock address within the GOB
1237 * u8 horizontal MV predictor
1238 * u8 vertical MV predictor
1239 * u8 horizontal MV predictor for block number 3
1240 * u8 vertical MV predictor for block number 3
1243 AV_PKT_DATA_H263_MB_INFO,
1246 * This side data should be associated with an audio stream and contains
1247 * ReplayGain information in form of the AVReplayGain struct.
1249 AV_PKT_DATA_REPLAYGAIN,
1252 * This side data contains a 3x3 transformation matrix describing an affine
1253 * transformation that needs to be applied to the decoded video frames for
1254 * correct presentation.
1256 * See libavutil/display.h for a detailed description of the data.
1258 AV_PKT_DATA_DISPLAYMATRIX,
1261 * This side data should be associated with a video stream and contains
1262 * Stereoscopic 3D information in form of the AVStereo3D struct.
1264 AV_PKT_DATA_STEREO3D,
1267 * This side data should be associated with an audio stream and corresponds
1268 * to enum AVAudioServiceType.
1270 AV_PKT_DATA_AUDIO_SERVICE_TYPE,
1273 * This side data contains quality related information from the encoder.
1275 * u32le quality factor of the compressed frame. Allowed range is between 1 (good) and FF_LAMBDA_MAX (bad).
1279 * u64le[error count] sum of squared differences between encoder in and output
1282 AV_PKT_DATA_QUALITY_STATS,
1285 * Recommmends skipping the specified number of samples
1287 * u32le number of samples to skip from start of this packet
1288 * u32le number of samples to skip from end of this packet
1289 * u8 reason for start skip
1290 * u8 reason for end skip (0=padding silence, 1=convergence)
1293 AV_PKT_DATA_SKIP_SAMPLES=70,
1296 * An AV_PKT_DATA_JP_DUALMONO side data packet indicates that
1297 * the packet may contain "dual mono" audio specific to Japanese DTV
1298 * and if it is true, recommends only the selected channel to be used.
1300 * u8 selected channels (0=mail/left, 1=sub/right, 2=both)
1303 AV_PKT_DATA_JP_DUALMONO,
1306 * A list of zero terminated key/value strings. There is no end marker for
1307 * the list, so it is required to rely on the side data size to stop.
1309 AV_PKT_DATA_STRINGS_METADATA,
1312 * Subtitle event position
1320 AV_PKT_DATA_SUBTITLE_POSITION,
1323 * Data found in BlockAdditional element of matroska container. There is
1324 * no end marker for the data, so it is required to rely on the side data
1325 * size to recognize the end. 8 byte id (as found in BlockAddId) followed
1328 AV_PKT_DATA_MATROSKA_BLOCKADDITIONAL,
1331 * The optional first identifier line of a WebVTT cue.
1333 AV_PKT_DATA_WEBVTT_IDENTIFIER,
1336 * The optional settings (rendering instructions) that immediately
1337 * follow the timestamp specifier of a WebVTT cue.
1339 AV_PKT_DATA_WEBVTT_SETTINGS,
1342 * A list of zero terminated key/value strings. There is no end marker for
1343 * the list, so it is required to rely on the side data size to stop. This
1344 * side data includes updated metadata which appeared in the stream.
1346 AV_PKT_DATA_METADATA_UPDATE,
1349 #define AV_PKT_DATA_QUALITY_FACTOR AV_PKT_DATA_QUALITY_STATS //DEPRECATED
1351 typedef struct AVPacketSideData {
1354 enum AVPacketSideDataType type;
1358 * This structure stores compressed data. It is typically exported by demuxers
1359 * and then passed as input to decoders, or received as output from encoders and
1360 * then passed to muxers.
1362 * For video, it should typically contain one compressed frame. For audio it may
1363 * contain several compressed frames. Encoders are allowed to output empty
1364 * packets, with no compressed data, containing only side data
1365 * (e.g. to update some stream parameters at the end of encoding).
1367 * AVPacket is one of the few structs in FFmpeg, whose size is a part of public
1368 * ABI. Thus it may be allocated on stack and no new fields can be added to it
1369 * without libavcodec and libavformat major bump.
1371 * The semantics of data ownership depends on the buf field.
1372 * If it is set, the packet data is dynamically allocated and is
1373 * valid indefinitely until a call to av_packet_unref() reduces the
1374 * reference count to 0.
1376 * If the buf field is not set av_packet_ref() would make a copy instead
1377 * of increasing the reference count.
1379 * The side data is always allocated with av_malloc(), copied by
1380 * av_packet_ref() and freed by av_packet_unref().
1382 * @see av_packet_ref
1383 * @see av_packet_unref
1385 typedef struct AVPacket {
1387 * A reference to the reference-counted buffer where the packet data is
1389 * May be NULL, then the packet data is not reference-counted.
1393 * Presentation timestamp in AVStream->time_base units; the time at which
1394 * the decompressed packet will be presented to the user.
1395 * Can be AV_NOPTS_VALUE if it is not stored in the file.
1396 * pts MUST be larger or equal to dts as presentation cannot happen before
1397 * decompression, unless one wants to view hex dumps. Some formats misuse
1398 * the terms dts and pts/cts to mean something different. Such timestamps
1399 * must be converted to true pts/dts before they are stored in AVPacket.
1403 * Decompression timestamp in AVStream->time_base units; the time at which
1404 * the packet is decompressed.
1405 * Can be AV_NOPTS_VALUE if it is not stored in the file.
1412 * A combination of AV_PKT_FLAG values
1416 * Additional packet data that can be provided by the container.
1417 * Packet can contain several types of side information.
1419 AVPacketSideData *side_data;
1420 int side_data_elems;
1423 * Duration of this packet in AVStream->time_base units, 0 if unknown.
1424 * Equals next_pts - this_pts in presentation order.
1428 int64_t pos; ///< byte position in stream, -1 if unknown
1430 #if FF_API_CONVERGENCE_DURATION
1432 * @deprecated Same as the duration field, but as int64_t. This was required
1433 * for Matroska subtitles, whose duration values could overflow when the
1434 * duration field was still an int.
1436 attribute_deprecated
1437 int64_t convergence_duration;
1440 #define AV_PKT_FLAG_KEY 0x0001 ///< The packet contains a keyframe
1441 #define AV_PKT_FLAG_CORRUPT 0x0002 ///< The packet content is corrupted
1443 enum AVSideDataParamChangeFlags {
1444 AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_COUNT = 0x0001,
1445 AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_LAYOUT = 0x0002,
1446 AV_SIDE_DATA_PARAM_CHANGE_SAMPLE_RATE = 0x0004,
1447 AV_SIDE_DATA_PARAM_CHANGE_DIMENSIONS = 0x0008,
1453 struct AVCodecInternal;
1457 AV_FIELD_PROGRESSIVE,
1458 AV_FIELD_TT, //< Top coded_first, top displayed first
1459 AV_FIELD_BB, //< Bottom coded first, bottom displayed first
1460 AV_FIELD_TB, //< Top coded first, bottom displayed first
1461 AV_FIELD_BT, //< Bottom coded first, top displayed first
1465 * main external API structure.
1466 * New fields can be added to the end with minor version bumps.
1467 * Removal, reordering and changes to existing fields require a major
1469 * Please use AVOptions (av_opt* / av_set/get*()) to access these fields from user
1471 * sizeof(AVCodecContext) must not be used outside libav*.
1473 typedef struct AVCodecContext {
1475 * information on struct for av_log
1476 * - set by avcodec_alloc_context3
1478 const AVClass *av_class;
1479 int log_level_offset;
1481 enum AVMediaType codec_type; /* see AVMEDIA_TYPE_xxx */
1482 const struct AVCodec *codec;
1483 #if FF_API_CODEC_NAME
1485 * @deprecated this field is not used for anything in libavcodec
1487 attribute_deprecated
1488 char codec_name[32];
1490 enum AVCodecID codec_id; /* see AV_CODEC_ID_xxx */
1493 * fourcc (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A').
1494 * This is used to work around some encoder bugs.
1495 * A demuxer should set this to what is stored in the field used to identify the codec.
1496 * If there are multiple such fields in a container then the demuxer should choose the one
1497 * which maximizes the information about the used codec.
1498 * If the codec tag field in a container is larger than 32 bits then the demuxer should
1499 * remap the longer ID to 32 bits with a table or other structure. Alternatively a new
1500 * extra_codec_tag + size could be added but for this a clear advantage must be demonstrated
1502 * - encoding: Set by user, if not then the default based on codec_id will be used.
1503 * - decoding: Set by user, will be converted to uppercase by libavcodec during init.
1505 unsigned int codec_tag;
1507 #if FF_API_STREAM_CODEC_TAG
1509 * @deprecated this field is unused
1511 attribute_deprecated
1512 unsigned int stream_codec_tag;
1518 * Private context used for internal data.
1520 * Unlike priv_data, this is not codec-specific. It is used in general
1521 * libavcodec functions.
1523 struct AVCodecInternal *internal;
1526 * Private data of the user, can be used to carry app specific stuff.
1527 * - encoding: Set by user.
1528 * - decoding: Set by user.
1533 * the average bitrate
1534 * - encoding: Set by user; unused for constant quantizer encoding.
1535 * - decoding: Set by user, may be overwritten by libavcodec
1536 * if this info is available in the stream
1541 * number of bits the bitstream is allowed to diverge from the reference.
1542 * the reference can be CBR (for CBR pass1) or VBR (for pass2)
1543 * - encoding: Set by user; unused for constant quantizer encoding.
1544 * - decoding: unused
1546 int bit_rate_tolerance;
1549 * Global quality for codecs which cannot change it per frame.
1550 * This should be proportional to MPEG-1/2/4 qscale.
1551 * - encoding: Set by user.
1552 * - decoding: unused
1557 * - encoding: Set by user.
1558 * - decoding: unused
1560 int compression_level;
1561 #define FF_COMPRESSION_DEFAULT -1
1565 * - encoding: Set by user.
1566 * - decoding: Set by user.
1572 * - encoding: Set by user.
1573 * - decoding: Set by user.
1578 * some codecs need / can use extradata like Huffman tables.
1579 * mjpeg: Huffman tables
1580 * rv10: additional flags
1581 * mpeg4: global headers (they can be in the bitstream or here)
1582 * The allocated memory should be AV_INPUT_BUFFER_PADDING_SIZE bytes larger
1583 * than extradata_size to avoid problems if it is read with the bitstream reader.
1584 * The bytewise contents of extradata must not depend on the architecture or CPU endianness.
1585 * - encoding: Set/allocated/freed by libavcodec.
1586 * - decoding: Set/allocated/freed by user.
1592 * This is the fundamental unit of time (in seconds) in terms
1593 * of which frame timestamps are represented. For fixed-fps content,
1594 * timebase should be 1/framerate and timestamp increments should be
1596 * This often, but not always is the inverse of the frame rate or field rate
1598 * - encoding: MUST be set by user.
1599 * - decoding: the use of this field for decoding is deprecated.
1600 * Use framerate instead.
1602 AVRational time_base;
1605 * For some codecs, the time base is closer to the field rate than the frame rate.
1606 * Most notably, H.264 and MPEG-2 specify time_base as half of frame duration
1607 * if no telecine is used ...
1609 * Set to time_base ticks per frame. Default 1, e.g., H.264/MPEG-2 set it to 2.
1611 int ticks_per_frame;
1616 * Encoding: Number of frames delay there will be from the encoder input to
1617 * the decoder output. (we assume the decoder matches the spec)
1618 * Decoding: Number of frames delay in addition to what a standard decoder
1619 * as specified in the spec would produce.
1622 * Number of frames the decoded output will be delayed relative to the
1626 * For encoding, this field is unused (see initial_padding).
1628 * For decoding, this is the number of samples the decoder needs to
1629 * output before the decoder's output is valid. When seeking, you should
1630 * start decoding this many samples prior to your desired seek point.
1632 * - encoding: Set by libavcodec.
1633 * - decoding: Set by libavcodec.
1640 * picture width / height.
1642 * @note Those fields may not match the values of the last
1643 * AVFrame outputted by avcodec_decode_video2 due frame
1646 * - encoding: MUST be set by user.
1647 * - decoding: May be set by the user before opening the decoder if known e.g.
1648 * from the container. Some decoders will require the dimensions
1649 * to be set by the caller. During decoding, the decoder may
1650 * overwrite those values as required while parsing the data.
1655 * Bitstream width / height, may be different from width/height e.g. when
1656 * the decoded frame is cropped before being output or lowres is enabled.
1658 * @note Those field may not match the value of the last
1659 * AVFrame outputted by avcodec_decode_video2 due frame
1662 * - encoding: unused
1663 * - decoding: May be set by the user before opening the decoder if known
1664 * e.g. from the container. During decoding, the decoder may
1665 * overwrite those values as required while parsing the data.
1667 int coded_width, coded_height;
1669 #if FF_API_ASPECT_EXTENDED
1670 #define FF_ASPECT_EXTENDED 15
1674 * the number of pictures in a group of pictures, or 0 for intra_only
1675 * - encoding: Set by user.
1676 * - decoding: unused
1681 * Pixel format, see AV_PIX_FMT_xxx.
1682 * May be set by the demuxer if known from headers.
1683 * May be overridden by the decoder if it knows better.
1685 * @note This field may not match the value of the last
1686 * AVFrame outputted by avcodec_decode_video2 due frame
1689 * - encoding: Set by user.
1690 * - decoding: Set by user if known, overridden by libavcodec while
1693 enum AVPixelFormat pix_fmt;
1695 #if FF_API_MOTION_EST
1697 * This option does nothing
1698 * @deprecated use codec private options instead
1700 attribute_deprecated int me_method;
1704 * If non NULL, 'draw_horiz_band' is called by the libavcodec
1705 * decoder to draw a horizontal band. It improves cache usage. Not
1706 * all codecs can do that. You must check the codec capabilities
1708 * When multithreading is used, it may be called from multiple threads
1709 * at the same time; threads might draw different parts of the same AVFrame,
1710 * or multiple AVFrames, and there is no guarantee that slices will be drawn
1712 * The function is also used by hardware acceleration APIs.
1713 * It is called at least once during frame decoding to pass
1714 * the data needed for hardware render.
1715 * In that mode instead of pixel data, AVFrame points to
1716 * a structure specific to the acceleration API. The application
1717 * reads the structure and can change some fields to indicate progress
1719 * - encoding: unused
1720 * - decoding: Set by user.
1721 * @param height the height of the slice
1722 * @param y the y position of the slice
1723 * @param type 1->top field, 2->bottom field, 3->frame
1724 * @param offset offset into the AVFrame.data from which the slice should be read
1726 void (*draw_horiz_band)(struct AVCodecContext *s,
1727 const AVFrame *src, int offset[AV_NUM_DATA_POINTERS],
1728 int y, int type, int height);
1731 * callback to negotiate the pixelFormat
1732 * @param fmt is the list of formats which are supported by the codec,
1733 * it is terminated by -1 as 0 is a valid format, the formats are ordered by quality.
1734 * The first is always the native one.
1735 * @note The callback may be called again immediately if initialization for
1736 * the selected (hardware-accelerated) pixel format failed.
1737 * @warning Behavior is undefined if the callback returns a value not
1738 * in the fmt list of formats.
1739 * @return the chosen format
1740 * - encoding: unused
1741 * - decoding: Set by user, if not set the native format will be chosen.
1743 enum AVPixelFormat (*get_format)(struct AVCodecContext *s, const enum AVPixelFormat * fmt);
1746 * maximum number of B-frames between non-B-frames
1747 * Note: The output will be delayed by max_b_frames+1 relative to the input.
1748 * - encoding: Set by user.
1749 * - decoding: unused
1754 * qscale factor between IP and B-frames
1755 * If > 0 then the last P-frame quantizer will be used (q= lastp_q*factor+offset).
1756 * If < 0 then normal ratecontrol will be done (q= -normal_q*factor+offset).
1757 * - encoding: Set by user.
1758 * - decoding: unused
1760 float b_quant_factor;
1762 #if FF_API_RC_STRATEGY
1763 /** @deprecated use codec private option instead */
1764 attribute_deprecated int rc_strategy;
1765 #define FF_RC_STRATEGY_XVID 1
1768 int b_frame_strategy;
1771 * qscale offset between IP and B-frames
1772 * - encoding: Set by user.
1773 * - decoding: unused
1775 float b_quant_offset;
1778 * Size of the frame reordering buffer in the decoder.
1779 * For MPEG-2 it is 1 IPB or 0 low delay IP.
1780 * - encoding: Set by libavcodec.
1781 * - decoding: Set by libavcodec.
1786 * 0-> h263 quant 1-> mpeg quant
1787 * - encoding: Set by user.
1788 * - decoding: unused
1793 * qscale factor between P and I-frames
1794 * If > 0 then the last p frame quantizer will be used (q= lastp_q*factor+offset).
1795 * If < 0 then normal ratecontrol will be done (q= -normal_q*factor+offset).
1796 * - encoding: Set by user.
1797 * - decoding: unused
1799 float i_quant_factor;
1802 * qscale offset between P and I-frames
1803 * - encoding: Set by user.
1804 * - decoding: unused
1806 float i_quant_offset;
1809 * luminance masking (0-> disabled)
1810 * - encoding: Set by user.
1811 * - decoding: unused
1816 * temporary complexity masking (0-> disabled)
1817 * - encoding: Set by user.
1818 * - decoding: unused
1820 float temporal_cplx_masking;
1823 * spatial complexity masking (0-> disabled)
1824 * - encoding: Set by user.
1825 * - decoding: unused
1827 float spatial_cplx_masking;
1830 * p block masking (0-> disabled)
1831 * - encoding: Set by user.
1832 * - decoding: unused
1837 * darkness masking (0-> disabled)
1838 * - encoding: Set by user.
1839 * - decoding: unused
1845 * - encoding: Set by libavcodec.
1846 * - decoding: Set by user (or 0).
1850 * prediction method (needed for huffyuv)
1851 * - encoding: Set by user.
1852 * - decoding: unused
1854 int prediction_method;
1855 #define FF_PRED_LEFT 0
1856 #define FF_PRED_PLANE 1
1857 #define FF_PRED_MEDIAN 2
1860 * slice offsets in the frame in bytes
1861 * - encoding: Set/allocated by libavcodec.
1862 * - decoding: Set/allocated by user (or NULL).
1867 * sample aspect ratio (0 if unknown)
1868 * That is the width of a pixel divided by the height of the pixel.
1869 * Numerator and denominator must be relatively prime and smaller than 256 for some video standards.
1870 * - encoding: Set by user.
1871 * - decoding: Set by libavcodec.
1873 AVRational sample_aspect_ratio;
1876 * motion estimation comparison function
1877 * - encoding: Set by user.
1878 * - decoding: unused
1882 * subpixel motion estimation comparison function
1883 * - encoding: Set by user.
1884 * - decoding: unused
1888 * macroblock comparison function (not supported yet)
1889 * - encoding: Set by user.
1890 * - decoding: unused
1894 * interlaced DCT comparison function
1895 * - encoding: Set by user.
1896 * - decoding: unused
1899 #define FF_CMP_SAD 0
1900 #define FF_CMP_SSE 1
1901 #define FF_CMP_SATD 2
1902 #define FF_CMP_DCT 3
1903 #define FF_CMP_PSNR 4
1904 #define FF_CMP_BIT 5
1906 #define FF_CMP_ZERO 7
1907 #define FF_CMP_VSAD 8
1908 #define FF_CMP_VSSE 9
1909 #define FF_CMP_NSSE 10
1910 #define FF_CMP_W53 11
1911 #define FF_CMP_W97 12
1912 #define FF_CMP_DCTMAX 13
1913 #define FF_CMP_DCT264 14
1914 #define FF_CMP_CHROMA 256
1917 * ME diamond size & shape
1918 * - encoding: Set by user.
1919 * - decoding: unused
1924 * amount of previous MV predictors (2a+1 x 2a+1 square)
1925 * - encoding: Set by user.
1926 * - decoding: unused
1928 int last_predictor_count;
1931 * prepass for motion estimation
1932 * - encoding: Set by user.
1933 * - decoding: unused
1938 * motion estimation prepass comparison function
1939 * - encoding: Set by user.
1940 * - decoding: unused
1945 * ME prepass diamond size & shape
1946 * - encoding: Set by user.
1947 * - decoding: unused
1953 * - encoding: Set by user.
1954 * - decoding: unused
1956 int me_subpel_quality;
1960 * DTG active format information (additional aspect ratio
1961 * information only used in DVB MPEG-2 transport streams)
1964 * - encoding: unused
1965 * - decoding: Set by decoder.
1966 * @deprecated Deprecated in favor of AVSideData
1968 attribute_deprecated int dtg_active_format;
1969 #define FF_DTG_AFD_SAME 8
1970 #define FF_DTG_AFD_4_3 9
1971 #define FF_DTG_AFD_16_9 10
1972 #define FF_DTG_AFD_14_9 11
1973 #define FF_DTG_AFD_4_3_SP_14_9 13
1974 #define FF_DTG_AFD_16_9_SP_14_9 14
1975 #define FF_DTG_AFD_SP_4_3 15
1976 #endif /* FF_API_AFD */
1979 * maximum motion estimation search range in subpel units
1980 * If 0 then no limit.
1982 * - encoding: Set by user.
1983 * - decoding: unused
1987 #if FF_API_QUANT_BIAS
1989 * @deprecated use encoder private option instead
1991 attribute_deprecated int intra_quant_bias;
1992 #define FF_DEFAULT_QUANT_BIAS 999999
1995 * @deprecated use encoder private option instead
1997 attribute_deprecated int inter_quant_bias;
2002 * - encoding: unused
2003 * - decoding: Set by user.
2006 #define SLICE_FLAG_CODED_ORDER 0x0001 ///< draw_horiz_band() is called in coded order instead of display
2007 #define SLICE_FLAG_ALLOW_FIELD 0x0002 ///< allow draw_horiz_band() with field slices (MPEG2 field pics)
2008 #define SLICE_FLAG_ALLOW_PLANE 0x0004 ///< allow draw_horiz_band() with 1 component at a time (SVQ1)
2012 * XVideo Motion Acceleration
2013 * - encoding: forbidden
2014 * - decoding: set by decoder
2015 * @deprecated XvMC doesn't need it anymore.
2017 attribute_deprecated int xvmc_acceleration;
2018 #endif /* FF_API_XVMC */
2021 * macroblock decision mode
2022 * - encoding: Set by user.
2023 * - decoding: unused
2026 #define FF_MB_DECISION_SIMPLE 0 ///< uses mb_cmp
2027 #define FF_MB_DECISION_BITS 1 ///< chooses the one which needs the fewest bits
2028 #define FF_MB_DECISION_RD 2 ///< rate distortion
2031 * custom intra quantization matrix
2032 * - encoding: Set by user, can be NULL.
2033 * - decoding: Set by libavcodec.
2035 uint16_t *intra_matrix;
2038 * custom inter quantization matrix
2039 * - encoding: Set by user, can be NULL.
2040 * - decoding: Set by libavcodec.
2042 uint16_t *inter_matrix;
2045 * scene change detection threshold
2046 * 0 is default, larger means fewer detected scene changes.
2047 * - encoding: Set by user.
2048 * - decoding: unused
2050 int scenechange_threshold;
2053 * noise reduction strength
2054 * - encoding: Set by user.
2055 * - decoding: unused
2057 int noise_reduction;
2061 * @deprecated this field is unused
2063 attribute_deprecated
2067 * @deprecated this field is unused
2069 attribute_deprecated
2074 * precision of the intra DC coefficient - 8
2075 * - encoding: Set by user.
2076 * - decoding: Set by libavcodec
2078 int intra_dc_precision;
2081 * Number of macroblock rows at the top which are skipped.
2082 * - encoding: unused
2083 * - decoding: Set by user.
2088 * Number of macroblock rows at the bottom which are skipped.
2089 * - encoding: unused
2090 * - decoding: Set by user.
2096 * @deprecated use encoder private options instead
2098 attribute_deprecated
2099 float border_masking;
2103 * minimum MB lagrange multipler
2104 * - encoding: Set by user.
2105 * - decoding: unused
2110 * maximum MB lagrange multipler
2111 * - encoding: Set by user.
2112 * - decoding: unused
2118 * - encoding: Set by user.
2119 * - decoding: unused
2121 int me_penalty_compensation;
2125 * - encoding: Set by user.
2126 * - decoding: unused
2132 * - encoding: Set by user.
2133 * - decoding: unused
2139 * - encoding: Set by user.
2140 * - decoding: unused
2145 * number of reference frames
2146 * - encoding: Set by user.
2147 * - decoding: Set by lavc.
2152 * chroma qp offset from luma
2153 * - encoding: Set by user.
2154 * - decoding: unused
2158 #if FF_API_UNUSED_MEMBERS
2160 * Multiplied by qscale for each frame and added to scene_change_score.
2161 * - encoding: Set by user.
2162 * - decoding: unused
2164 attribute_deprecated int scenechange_factor;
2169 * Note: Value depends upon the compare function used for fullpel ME.
2170 * - encoding: Set by user.
2171 * - decoding: unused
2176 * Adjust sensitivity of b_frame_strategy 1.
2177 * - encoding: Set by user.
2178 * - decoding: unused
2183 * Chromaticity coordinates of the source primaries.
2184 * - encoding: Set by user
2185 * - decoding: Set by libavcodec
2187 enum AVColorPrimaries color_primaries;
2190 * Color Transfer Characteristic.
2191 * - encoding: Set by user
2192 * - decoding: Set by libavcodec
2194 enum AVColorTransferCharacteristic color_trc;
2197 * YUV colorspace type.
2198 * - encoding: Set by user
2199 * - decoding: Set by libavcodec
2201 enum AVColorSpace colorspace;
2204 * MPEG vs JPEG YUV range.
2205 * - encoding: Set by user
2206 * - decoding: Set by libavcodec
2208 enum AVColorRange color_range;
2211 * This defines the location of chroma samples.
2212 * - encoding: Set by user
2213 * - decoding: Set by libavcodec
2215 enum AVChromaLocation chroma_sample_location;
2219 * Indicates number of picture subdivisions. Used for parallelized
2221 * - encoding: Set by user
2222 * - decoding: unused
2227 * - encoding: set by libavcodec
2228 * - decoding: Set by user.
2230 enum AVFieldOrder field_order;
2233 int sample_rate; ///< samples per second
2234 int channels; ///< number of audio channels
2237 * audio sample format
2238 * - encoding: Set by user.
2239 * - decoding: Set by libavcodec.
2241 enum AVSampleFormat sample_fmt; ///< sample format
2243 /* The following data should not be initialized. */
2245 * Number of samples per channel in an audio frame.
2247 * - encoding: set by libavcodec in avcodec_open2(). Each submitted frame
2248 * except the last must contain exactly frame_size samples per channel.
2249 * May be 0 when the codec has AV_CODEC_CAP_VARIABLE_FRAME_SIZE set, then the
2250 * frame size is not restricted.
2251 * - decoding: may be set by some decoders to indicate constant frame size
2256 * Frame counter, set by libavcodec.
2258 * - decoding: total number of frames returned from the decoder so far.
2259 * - encoding: total number of frames passed to the encoder so far.
2261 * @note the counter is not incremented if encoding/decoding resulted in
2267 * number of bytes per packet if constant and known or 0
2268 * Used by some WAV based audio codecs.
2273 * Audio cutoff bandwidth (0 means "automatic")
2274 * - encoding: Set by user.
2275 * - decoding: unused
2280 * Audio channel layout.
2281 * - encoding: set by user.
2282 * - decoding: set by user, may be overwritten by libavcodec.
2284 uint64_t channel_layout;
2287 * Request decoder to use this channel layout if it can (0 for default)
2288 * - encoding: unused
2289 * - decoding: Set by user.
2291 uint64_t request_channel_layout;
2294 * Type of service that the audio stream conveys.
2295 * - encoding: Set by user.
2296 * - decoding: Set by libavcodec.
2298 enum AVAudioServiceType audio_service_type;
2301 * desired sample format
2302 * - encoding: Not used.
2303 * - decoding: Set by user.
2304 * Decoder will decode to this format if it can.
2306 enum AVSampleFormat request_sample_fmt;
2309 * This callback is called at the beginning of each frame to get data
2310 * buffer(s) for it. There may be one contiguous buffer for all the data or
2311 * there may be a buffer per each data plane or anything in between. What
2312 * this means is, you may set however many entries in buf[] you feel necessary.
2313 * Each buffer must be reference-counted using the AVBuffer API (see description
2316 * The following fields will be set in the frame before this callback is
2319 * - width, height (video only)
2320 * - sample_rate, channel_layout, nb_samples (audio only)
2321 * Their values may differ from the corresponding values in
2322 * AVCodecContext. This callback must use the frame values, not the codec
2323 * context values, to calculate the required buffer size.
2325 * This callback must fill the following fields in the frame:
2329 * * if the data is planar audio with more than 8 channels, then this
2330 * callback must allocate and fill extended_data to contain all pointers
2331 * to all data planes. data[] must hold as many pointers as it can.
2332 * extended_data must be allocated with av_malloc() and will be freed in
2334 * * otherwise exended_data must point to data
2335 * - buf[] must contain one or more pointers to AVBufferRef structures. Each of
2336 * the frame's data and extended_data pointers must be contained in these. That
2337 * is, one AVBufferRef for each allocated chunk of memory, not necessarily one
2338 * AVBufferRef per data[] entry. See: av_buffer_create(), av_buffer_alloc(),
2339 * and av_buffer_ref().
2340 * - extended_buf and nb_extended_buf must be allocated with av_malloc() by
2341 * this callback and filled with the extra buffers if there are more
2342 * buffers than buf[] can hold. extended_buf will be freed in
2345 * If AV_CODEC_CAP_DR1 is not set then get_buffer2() must call
2346 * avcodec_default_get_buffer2() instead of providing buffers allocated by
2349 * Each data plane must be aligned to the maximum required by the target
2352 * @see avcodec_default_get_buffer2()
2356 * If AV_GET_BUFFER_FLAG_REF is set in flags then the frame may be reused
2357 * (read and/or written to if it is writable) later by libavcodec.
2359 * avcodec_align_dimensions2() should be used to find the required width and
2360 * height, as they normally need to be rounded up to the next multiple of 16.
2362 * Some decoders do not support linesizes changing between frames.
2364 * If frame multithreading is used and thread_safe_callbacks is set,
2365 * this callback may be called from a different thread, but not from more
2366 * than one at once. Does not need to be reentrant.
2368 * @see avcodec_align_dimensions2()
2372 * Decoders request a buffer of a particular size by setting
2373 * AVFrame.nb_samples prior to calling get_buffer2(). The decoder may,
2374 * however, utilize only part of the buffer by setting AVFrame.nb_samples
2375 * to a smaller value in the output frame.
2377 * As a convenience, av_samples_get_buffer_size() and
2378 * av_samples_fill_arrays() in libavutil may be used by custom get_buffer2()
2379 * functions to find the required data size and to fill data pointers and
2380 * linesize. In AVFrame.linesize, only linesize[0] may be set for audio
2381 * since all planes must be the same size.
2383 * @see av_samples_get_buffer_size(), av_samples_fill_arrays()
2385 * - encoding: unused
2386 * - decoding: Set by libavcodec, user can override.
2388 int (*get_buffer2)(struct AVCodecContext *s, AVFrame *frame, int flags);
2391 * If non-zero, the decoded audio and video frames returned from
2392 * avcodec_decode_video2() and avcodec_decode_audio4() are reference-counted
2393 * and are valid indefinitely. The caller must free them with
2394 * av_frame_unref() when they are not needed anymore.
2395 * Otherwise, the decoded frames must not be freed by the caller and are
2396 * only valid until the next decode call.
2398 * - encoding: unused
2399 * - decoding: set by the caller before avcodec_open2().
2401 int refcounted_frames;
2403 /* - encoding parameters */
2404 float qcompress; ///< amount of qscale change between easy & hard scenes (0.0-1.0)
2405 float qblur; ///< amount of qscale smoothing over time (0.0-1.0)
2409 * - encoding: Set by user.
2410 * - decoding: unused
2416 * - encoding: Set by user.
2417 * - decoding: unused
2422 * maximum quantizer difference between frames
2423 * - encoding: Set by user.
2424 * - decoding: unused
2430 * @deprecated use encoder private options instead
2432 attribute_deprecated
2435 attribute_deprecated
2437 attribute_deprecated
2442 * decoder bitstream buffer size
2443 * - encoding: Set by user.
2444 * - decoding: unused
2449 * ratecontrol override, see RcOverride
2450 * - encoding: Allocated/set/freed by user.
2451 * - decoding: unused
2453 int rc_override_count;
2454 RcOverride *rc_override;
2458 * @deprecated use encoder private options instead
2460 attribute_deprecated
2466 * - encoding: Set by user.
2467 * - decoding: Set by user, may be overwritten by libavcodec.
2469 int64_t rc_max_rate;
2473 * - encoding: Set by user.
2474 * - decoding: unused
2476 int64_t rc_min_rate;
2480 * @deprecated use encoder private options instead
2482 attribute_deprecated
2483 float rc_buffer_aggressivity;
2485 attribute_deprecated
2486 float rc_initial_cplx;
2490 * Ratecontrol attempt to use, at maximum, <value> of what can be used without an underflow.
2491 * - encoding: Set by user.
2492 * - decoding: unused.
2494 float rc_max_available_vbv_use;
2497 * Ratecontrol attempt to use, at least, <value> times the amount needed to prevent a vbv overflow.
2498 * - encoding: Set by user.
2499 * - decoding: unused.
2501 float rc_min_vbv_overflow_use;
2504 * Number of bits which should be loaded into the rc buffer before decoding starts.
2505 * - encoding: Set by user.
2506 * - decoding: unused
2508 int rc_initial_buffer_occupancy;
2510 #define FF_CODER_TYPE_VLC 0
2511 #define FF_CODER_TYPE_AC 1
2512 #define FF_CODER_TYPE_RAW 2
2513 #define FF_CODER_TYPE_RLE 3
2514 #if FF_API_UNUSED_MEMBERS
2515 #define FF_CODER_TYPE_DEFLATE 4
2516 #endif /* FF_API_UNUSED_MEMBERS */
2519 * - encoding: Set by user.
2520 * - decoding: unused
2526 * - encoding: Set by user.
2527 * - decoding: unused
2533 * @deprecated use encoder private options instead
2535 attribute_deprecated
2539 * @deprecated use encoder private options instead
2541 attribute_deprecated
2546 * frame skip threshold
2547 * - encoding: Set by user.
2548 * - decoding: unused
2550 int frame_skip_threshold;
2554 * - encoding: Set by user.
2555 * - decoding: unused
2557 int frame_skip_factor;
2560 * frame skip exponent
2561 * - encoding: Set by user.
2562 * - decoding: unused
2567 * frame skip comparison function
2568 * - encoding: Set by user.
2569 * - decoding: unused
2574 * trellis RD quantization
2575 * - encoding: Set by user.
2576 * - decoding: unused
2581 * - encoding: Set by user.
2582 * - decoding: unused
2584 int min_prediction_order;
2587 * - encoding: Set by user.
2588 * - decoding: unused
2590 int max_prediction_order;
2593 * GOP timecode frame start number
2594 * - encoding: Set by user, in non drop frame format
2595 * - decoding: Set by libavcodec (timecode in the 25 bits format, -1 if unset)
2597 int64_t timecode_frame_start;
2599 /* The RTP callback: This function is called */
2600 /* every time the encoder has a packet to send. */
2601 /* It depends on the encoder if the data starts */
2602 /* with a Start Code (it should). H.263 does. */
2603 /* mb_nb contains the number of macroblocks */
2604 /* encoded in the RTP payload. */
2605 void (*rtp_callback)(struct AVCodecContext *avctx, void *data, int size, int mb_nb);
2607 int rtp_payload_size; /* The size of the RTP payload: the coder will */
2608 /* do its best to deliver a chunk with size */
2609 /* below rtp_payload_size, the chunk will start */
2610 /* with a start code on some codecs like H.263. */
2611 /* This doesn't take account of any particular */
2612 /* headers inside the transmitted RTP payload. */
2614 /* statistics, used for 2-pass encoding */
2625 * number of bits used for the previously encoded frame
2626 * - encoding: Set by libavcodec.
2627 * - decoding: unused
2632 * pass1 encoding statistics output buffer
2633 * - encoding: Set by libavcodec.
2634 * - decoding: unused
2639 * pass2 encoding statistics input buffer
2640 * Concatenated stuff from stats_out of pass1 should be placed here.
2641 * - encoding: Allocated/set/freed by user.
2642 * - decoding: unused
2647 * Work around bugs in encoders which sometimes cannot be detected automatically.
2648 * - encoding: Set by user
2649 * - decoding: Set by user
2651 int workaround_bugs;
2652 #define FF_BUG_AUTODETECT 1 ///< autodetection
2653 #if FF_API_OLD_MSMPEG4
2654 #define FF_BUG_OLD_MSMPEG4 2
2656 #define FF_BUG_XVID_ILACE 4
2657 #define FF_BUG_UMP4 8
2658 #define FF_BUG_NO_PADDING 16
2659 #define FF_BUG_AMV 32
2661 #define FF_BUG_AC_VLC 0 ///< Will be removed, libavcodec can now handle these non-compliant files by default.
2663 #define FF_BUG_QPEL_CHROMA 64
2664 #define FF_BUG_STD_QPEL 128
2665 #define FF_BUG_QPEL_CHROMA2 256
2666 #define FF_BUG_DIRECT_BLOCKSIZE 512
2667 #define FF_BUG_EDGE 1024
2668 #define FF_BUG_HPEL_CHROMA 2048
2669 #define FF_BUG_DC_CLIP 4096
2670 #define FF_BUG_MS 8192 ///< Work around various bugs in Microsoft's broken decoders.
2671 #define FF_BUG_TRUNCATED 16384
2674 * strictly follow the standard (MPEG4, ...).
2675 * - encoding: Set by user.
2676 * - decoding: Set by user.
2677 * Setting this to STRICT or higher means the encoder and decoder will
2678 * generally do stupid things, whereas setting it to unofficial or lower
2679 * will mean the encoder might produce output that is not supported by all
2680 * spec-compliant decoders. Decoders don't differentiate between normal,
2681 * unofficial and experimental (that is, they always try to decode things
2682 * when they can) unless they are explicitly asked to behave stupidly
2683 * (=strictly conform to the specs)
2685 int strict_std_compliance;
2686 #define FF_COMPLIANCE_VERY_STRICT 2 ///< Strictly conform to an older more strict version of the spec or reference software.
2687 #define FF_COMPLIANCE_STRICT 1 ///< Strictly conform to all the things in the spec no matter what consequences.
2688 #define FF_COMPLIANCE_NORMAL 0
2689 #define FF_COMPLIANCE_UNOFFICIAL -1 ///< Allow unofficial extensions
2690 #define FF_COMPLIANCE_EXPERIMENTAL -2 ///< Allow nonstandardized experimental things.
2693 * error concealment flags
2694 * - encoding: unused
2695 * - decoding: Set by user.
2697 int error_concealment;
2698 #define FF_EC_GUESS_MVS 1
2699 #define FF_EC_DEBLOCK 2
2700 #define FF_EC_FAVOR_INTER 256
2704 * - encoding: Set by user.
2705 * - decoding: Set by user.
2708 #define FF_DEBUG_PICT_INFO 1
2709 #define FF_DEBUG_RC 2
2710 #define FF_DEBUG_BITSTREAM 4
2711 #define FF_DEBUG_MB_TYPE 8
2712 #define FF_DEBUG_QP 16
2715 * @deprecated this option does nothing
2717 #define FF_DEBUG_MV 32
2719 #define FF_DEBUG_DCT_COEFF 0x00000040
2720 #define FF_DEBUG_SKIP 0x00000080
2721 #define FF_DEBUG_STARTCODE 0x00000100
2722 #if FF_API_UNUSED_MEMBERS
2723 #define FF_DEBUG_PTS 0x00000200
2724 #endif /* FF_API_UNUSED_MEMBERS */
2725 #define FF_DEBUG_ER 0x00000400
2726 #define FF_DEBUG_MMCO 0x00000800
2727 #define FF_DEBUG_BUGS 0x00001000
2729 #define FF_DEBUG_VIS_QP 0x00002000 ///< only access through AVOptions from outside libavcodec
2730 #define FF_DEBUG_VIS_MB_TYPE 0x00004000 ///< only access through AVOptions from outside libavcodec
2732 #define FF_DEBUG_BUFFERS 0x00008000
2733 #define FF_DEBUG_THREADS 0x00010000
2734 #define FF_DEBUG_GREEN_MD 0x00800000
2735 #define FF_DEBUG_NOMC 0x01000000
2740 * Code outside libavcodec should access this field using AVOptions
2741 * - encoding: Set by user.
2742 * - decoding: Set by user.
2745 #define FF_DEBUG_VIS_MV_P_FOR 0x00000001 //visualize forward predicted MVs of P frames
2746 #define FF_DEBUG_VIS_MV_B_FOR 0x00000002 //visualize forward predicted MVs of B frames
2747 #define FF_DEBUG_VIS_MV_B_BACK 0x00000004 //visualize backward predicted MVs of B frames
2751 * Error recognition; may misdetect some more or less valid parts as errors.
2752 * - encoding: unused
2753 * - decoding: Set by user.
2755 int err_recognition;
2758 * Verify checksums embedded in the bitstream (could be of either encoded or
2759 * decoded data, depending on the codec) and print an error message on mismatch.
2760 * If AV_EF_EXPLODE is also set, a mismatching checksum will result in the
2761 * decoder returning an error.
2763 #define AV_EF_CRCCHECK (1<<0)
2764 #define AV_EF_BITSTREAM (1<<1) ///< detect bitstream specification deviations
2765 #define AV_EF_BUFFER (1<<2) ///< detect improper bitstream length
2766 #define AV_EF_EXPLODE (1<<3) ///< abort decoding on minor error detection
2768 #define AV_EF_IGNORE_ERR (1<<15) ///< ignore errors and continue
2769 #define AV_EF_CAREFUL (1<<16) ///< consider things that violate the spec, are fast to calculate and have not been seen in the wild as errors
2770 #define AV_EF_COMPLIANT (1<<17) ///< consider all spec non compliances as errors
2771 #define AV_EF_AGGRESSIVE (1<<18) ///< consider things that a sane encoder should not do as an error
2775 * opaque 64bit number (generally a PTS) that will be reordered and
2776 * output in AVFrame.reordered_opaque
2777 * - encoding: unused
2778 * - decoding: Set by user.
2780 int64_t reordered_opaque;
2783 * Hardware accelerator in use
2784 * - encoding: unused.
2785 * - decoding: Set by libavcodec
2787 struct AVHWAccel *hwaccel;
2790 * Hardware accelerator context.
2791 * For some hardware accelerators, a global context needs to be
2792 * provided by the user. In that case, this holds display-dependent
2793 * data FFmpeg cannot instantiate itself. Please refer to the
2794 * FFmpeg HW accelerator documentation to know how to fill this
2795 * is. e.g. for VA API, this is a struct vaapi_context.
2796 * - encoding: unused
2797 * - decoding: Set by user
2799 void *hwaccel_context;
2803 * - encoding: Set by libavcodec if flags & AV_CODEC_FLAG_PSNR.
2804 * - decoding: unused
2806 uint64_t error[AV_NUM_DATA_POINTERS];
2809 * DCT algorithm, see FF_DCT_* below
2810 * - encoding: Set by user.
2811 * - decoding: unused
2814 #define FF_DCT_AUTO 0
2815 #define FF_DCT_FASTINT 1
2816 #define FF_DCT_INT 2
2817 #define FF_DCT_MMX 3
2818 #define FF_DCT_ALTIVEC 5
2819 #define FF_DCT_FAAN 6
2822 * IDCT algorithm, see FF_IDCT_* below.
2823 * - encoding: Set by user.
2824 * - decoding: Set by user.
2827 #define FF_IDCT_AUTO 0
2828 #define FF_IDCT_INT 1
2829 #define FF_IDCT_SIMPLE 2
2830 #define FF_IDCT_SIMPLEMMX 3
2831 #define FF_IDCT_ARM 7
2832 #define FF_IDCT_ALTIVEC 8
2834 #define FF_IDCT_SH4 9
2836 #define FF_IDCT_SIMPLEARM 10
2837 #if FF_API_UNUSED_MEMBERS
2838 #define FF_IDCT_IPP 13
2839 #endif /* FF_API_UNUSED_MEMBERS */
2840 #define FF_IDCT_XVID 14
2841 #if FF_API_IDCT_XVIDMMX
2842 #define FF_IDCT_XVIDMMX 14
2843 #endif /* FF_API_IDCT_XVIDMMX */
2844 #define FF_IDCT_SIMPLEARMV5TE 16
2845 #define FF_IDCT_SIMPLEARMV6 17
2846 #if FF_API_ARCH_SPARC
2847 #define FF_IDCT_SIMPLEVIS 18
2849 #define FF_IDCT_FAAN 20
2850 #define FF_IDCT_SIMPLENEON 22
2851 #if FF_API_ARCH_ALPHA
2852 #define FF_IDCT_SIMPLEALPHA 23
2854 #define FF_IDCT_SIMPLEAUTO 128
2857 * bits per sample/pixel from the demuxer (needed for huffyuv).
2858 * - encoding: Set by libavcodec.
2859 * - decoding: Set by user.
2861 int bits_per_coded_sample;
2864 * Bits per sample/pixel of internal libavcodec pixel/sample format.
2865 * - encoding: set by user.
2866 * - decoding: set by libavcodec.
2868 int bits_per_raw_sample;
2872 * low resolution decoding, 1-> 1/2 size, 2->1/4 size
2873 * - encoding: unused
2874 * - decoding: Set by user.
2875 * Code outside libavcodec should access this field using:
2876 * av_codec_{get,set}_lowres(avctx)
2881 #if FF_API_CODED_FRAME
2883 * the picture in the bitstream
2884 * - encoding: Set by libavcodec.
2885 * - decoding: unused
2887 * @deprecated use the quality factor packet side data instead
2889 attribute_deprecated AVFrame *coded_frame;
2894 * is used to decide how many independent tasks should be passed to execute()
2895 * - encoding: Set by user.
2896 * - decoding: Set by user.
2901 * Which multithreading methods to use.
2902 * Use of FF_THREAD_FRAME will increase decoding delay by one frame per thread,
2903 * so clients which cannot provide future frames should not use it.
2905 * - encoding: Set by user, otherwise the default is used.
2906 * - decoding: Set by user, otherwise the default is used.
2909 #define FF_THREAD_FRAME 1 ///< Decode more than one frame at once
2910 #define FF_THREAD_SLICE 2 ///< Decode more than one part of a single frame at once
2913 * Which multithreading methods are in use by the codec.
2914 * - encoding: Set by libavcodec.
2915 * - decoding: Set by libavcodec.
2917 int active_thread_type;
2920 * Set by the client if its custom get_buffer() callback can be called
2921 * synchronously from another thread, which allows faster multithreaded decoding.
2922 * draw_horiz_band() will be called from other threads regardless of this setting.
2923 * Ignored if the default get_buffer() is used.
2924 * - encoding: Set by user.
2925 * - decoding: Set by user.
2927 int thread_safe_callbacks;
2930 * The codec may call this to execute several independent things.
2931 * It will return only after finishing all tasks.
2932 * The user may replace this with some multithreaded implementation,
2933 * the default implementation will execute the parts serially.
2934 * @param count the number of things to execute
2935 * - encoding: Set by libavcodec, user can override.
2936 * - decoding: Set by libavcodec, user can override.
2938 int (*execute)(struct AVCodecContext *c, int (*func)(struct AVCodecContext *c2, void *arg), void *arg2, int *ret, int count, int size);
2941 * The codec may call this to execute several independent things.
2942 * It will return only after finishing all tasks.
2943 * The user may replace this with some multithreaded implementation,
2944 * the default implementation will execute the parts serially.
2945 * Also see avcodec_thread_init and e.g. the --enable-pthread configure option.
2946 * @param c context passed also to func
2947 * @param count the number of things to execute
2948 * @param arg2 argument passed unchanged to func
2949 * @param ret return values of executed functions, must have space for "count" values. May be NULL.
2950 * @param func function that will be called count times, with jobnr from 0 to count-1.
2951 * threadnr will be in the range 0 to c->thread_count-1 < MAX_THREADS and so that no
2952 * two instances of func executing at the same time will have the same threadnr.
2953 * @return always 0 currently, but code should handle a future improvement where when any call to func
2954 * returns < 0 no further calls to func may be done and < 0 is returned.
2955 * - encoding: Set by libavcodec, user can override.
2956 * - decoding: Set by libavcodec, user can override.
2958 int (*execute2)(struct AVCodecContext *c, int (*func)(struct AVCodecContext *c2, void *arg, int jobnr, int threadnr), void *arg2, int *ret, int count);
2961 * noise vs. sse weight for the nsse comparison function
2962 * - encoding: Set by user.
2963 * - decoding: unused
2969 * - encoding: Set by user.
2970 * - decoding: Set by libavcodec.
2973 #define FF_PROFILE_UNKNOWN -99
2974 #define FF_PROFILE_RESERVED -100
2976 #define FF_PROFILE_AAC_MAIN 0
2977 #define FF_PROFILE_AAC_LOW 1
2978 #define FF_PROFILE_AAC_SSR 2
2979 #define FF_PROFILE_AAC_LTP 3
2980 #define FF_PROFILE_AAC_HE 4
2981 #define FF_PROFILE_AAC_HE_V2 28
2982 #define FF_PROFILE_AAC_LD 22
2983 #define FF_PROFILE_AAC_ELD 38
2984 #define FF_PROFILE_MPEG2_AAC_LOW 128
2985 #define FF_PROFILE_MPEG2_AAC_HE 131
2987 #define FF_PROFILE_DTS 20
2988 #define FF_PROFILE_DTS_ES 30
2989 #define FF_PROFILE_DTS_96_24 40
2990 #define FF_PROFILE_DTS_HD_HRA 50
2991 #define FF_PROFILE_DTS_HD_MA 60
2992 #define FF_PROFILE_DTS_EXPRESS 70
2994 #define FF_PROFILE_MPEG2_422 0
2995 #define FF_PROFILE_MPEG2_HIGH 1
2996 #define FF_PROFILE_MPEG2_SS 2
2997 #define FF_PROFILE_MPEG2_SNR_SCALABLE 3
2998 #define FF_PROFILE_MPEG2_MAIN 4
2999 #define FF_PROFILE_MPEG2_SIMPLE 5
3001 #define FF_PROFILE_H264_CONSTRAINED (1<<9) // 8+1; constraint_set1_flag
3002 #define FF_PROFILE_H264_INTRA (1<<11) // 8+3; constraint_set3_flag
3004 #define FF_PROFILE_H264_BASELINE 66
3005 #define FF_PROFILE_H264_CONSTRAINED_BASELINE (66|FF_PROFILE_H264_CONSTRAINED)
3006 #define FF_PROFILE_H264_MAIN 77
3007 #define FF_PROFILE_H264_EXTENDED 88
3008 #define FF_PROFILE_H264_HIGH 100
3009 #define FF_PROFILE_H264_HIGH_10 110
3010 #define FF_PROFILE_H264_HIGH_10_INTRA (110|FF_PROFILE_H264_INTRA)
3011 #define FF_PROFILE_H264_HIGH_422 122
3012 #define FF_PROFILE_H264_HIGH_422_INTRA (122|FF_PROFILE_H264_INTRA)
3013 #define FF_PROFILE_H264_HIGH_444 144
3014 #define FF_PROFILE_H264_HIGH_444_PREDICTIVE 244
3015 #define FF_PROFILE_H264_HIGH_444_INTRA (244|FF_PROFILE_H264_INTRA)
3016 #define FF_PROFILE_H264_CAVLC_444 44
3018 #define FF_PROFILE_VC1_SIMPLE 0
3019 #define FF_PROFILE_VC1_MAIN 1
3020 #define FF_PROFILE_VC1_COMPLEX 2
3021 #define FF_PROFILE_VC1_ADVANCED 3
3023 #define FF_PROFILE_MPEG4_SIMPLE 0
3024 #define FF_PROFILE_MPEG4_SIMPLE_SCALABLE 1
3025 #define FF_PROFILE_MPEG4_CORE 2
3026 #define FF_PROFILE_MPEG4_MAIN 3
3027 #define FF_PROFILE_MPEG4_N_BIT 4
3028 #define FF_PROFILE_MPEG4_SCALABLE_TEXTURE 5
3029 #define FF_PROFILE_MPEG4_SIMPLE_FACE_ANIMATION 6
3030 #define FF_PROFILE_MPEG4_BASIC_ANIMATED_TEXTURE 7
3031 #define FF_PROFILE_MPEG4_HYBRID 8
3032 #define FF_PROFILE_MPEG4_ADVANCED_REAL_TIME 9
3033 #define FF_PROFILE_MPEG4_CORE_SCALABLE 10
3034 #define FF_PROFILE_MPEG4_ADVANCED_CODING 11
3035 #define FF_PROFILE_MPEG4_ADVANCED_CORE 12
3036 #define FF_PROFILE_MPEG4_ADVANCED_SCALABLE_TEXTURE 13
3037 #define FF_PROFILE_MPEG4_SIMPLE_STUDIO 14
3038 #define FF_PROFILE_MPEG4_ADVANCED_SIMPLE 15
3040 #define FF_PROFILE_JPEG2000_CSTREAM_RESTRICTION_0 0
3041 #define FF_PROFILE_JPEG2000_CSTREAM_RESTRICTION_1 1
3042 #define FF_PROFILE_JPEG2000_CSTREAM_NO_RESTRICTION 2
3043 #define FF_PROFILE_JPEG2000_DCINEMA_2K 3
3044 #define FF_PROFILE_JPEG2000_DCINEMA_4K 4
3046 #define FF_PROFILE_VP9_0 0
3047 #define FF_PROFILE_VP9_1 1
3048 #define FF_PROFILE_VP9_2 2
3049 #define FF_PROFILE_VP9_3 3
3051 #define FF_PROFILE_HEVC_MAIN 1
3052 #define FF_PROFILE_HEVC_MAIN_10 2
3053 #define FF_PROFILE_HEVC_MAIN_STILL_PICTURE 3
3054 #define FF_PROFILE_HEVC_REXT 4
3058 * - encoding: Set by user.
3059 * - decoding: Set by libavcodec.
3062 #define FF_LEVEL_UNKNOWN -99
3065 * Skip loop filtering for selected frames.
3066 * - encoding: unused
3067 * - decoding: Set by user.
3069 enum AVDiscard skip_loop_filter;
3072 * Skip IDCT/dequantization for selected frames.
3073 * - encoding: unused
3074 * - decoding: Set by user.
3076 enum AVDiscard skip_idct;
3079 * Skip decoding for selected frames.
3080 * - encoding: unused
3081 * - decoding: Set by user.
3083 enum AVDiscard skip_frame;
3086 * Header containing style information for text subtitles.
3087 * For SUBTITLE_ASS subtitle type, it should contain the whole ASS
3088 * [Script Info] and [V4+ Styles] section, plus the [Events] line and
3089 * the Format line following. It shouldn't include any Dialogue line.
3090 * - encoding: Set/allocated/freed by user (before avcodec_open2())
3091 * - decoding: Set/allocated/freed by libavcodec (by avcodec_open2())
3093 uint8_t *subtitle_header;
3094 int subtitle_header_size;
3096 #if FF_API_ERROR_RATE
3098 * @deprecated use the 'error_rate' private AVOption of the mpegvideo
3101 attribute_deprecated
3106 * VBV delay coded in the last frame (in periods of a 27 MHz clock).
3107 * Used for compliant TS muxing.
3108 * - encoding: Set by libavcodec.
3109 * - decoding: unused.
3113 #if FF_API_SIDEDATA_ONLY_PKT
3115 * Encoding only and set by default. Allow encoders to output packets
3116 * that do not contain any encoded data, only side data.
3118 * Some encoders need to output such packets, e.g. to update some stream
3119 * parameters at the end of encoding.
3121 * @deprecated this field disables the default behaviour and
3122 * it is kept only for compatibility.
3124 attribute_deprecated
3125 int side_data_only_packets;
3129 * Audio only. The number of "priming" samples (padding) inserted by the
3130 * encoder at the beginning of the audio. I.e. this number of leading
3131 * decoded samples must be discarded by the caller to get the original audio
3132 * without leading padding.
3134 * - decoding: unused
3135 * - encoding: Set by libavcodec. The timestamps on the output packets are
3136 * adjusted by the encoder so that they always refer to the
3137 * first sample of the data actually contained in the packet,
3138 * including any added padding. E.g. if the timebase is
3139 * 1/samplerate and the timestamp of the first input sample is
3140 * 0, the timestamp of the first output packet will be
3143 int initial_padding;
3146 * - decoding: For codecs that store a framerate value in the compressed
3147 * bitstream, the decoder may export it here. { 0, 1} when
3149 * - encoding: unused
3151 AVRational framerate;
3154 * Nominal unaccelerated pixel format, see AV_PIX_FMT_xxx.
3155 * - encoding: unused.
3156 * - decoding: Set by libavcodec before calling get_format()
3158 enum AVPixelFormat sw_pix_fmt;
3161 * Timebase in which pkt_dts/pts and AVPacket.dts/pts are.
3162 * Code outside libavcodec should access this field using:
3163 * av_codec_{get,set}_pkt_timebase(avctx)
3164 * - encoding unused.
3165 * - decoding set by user.
3167 AVRational pkt_timebase;
3171 * Code outside libavcodec should access this field using:
3172 * av_codec_{get,set}_codec_descriptor(avctx)
3173 * - encoding: unused.
3174 * - decoding: set by libavcodec.
3176 const AVCodecDescriptor *codec_descriptor;
3180 * low resolution decoding, 1-> 1/2 size, 2->1/4 size
3181 * - encoding: unused
3182 * - decoding: Set by user.
3183 * Code outside libavcodec should access this field using:
3184 * av_codec_{get,set}_lowres(avctx)
3190 * Current statistics for PTS correction.
3191 * - decoding: maintained and used by libavcodec, not intended to be used by user apps
3192 * - encoding: unused
3194 int64_t pts_correction_num_faulty_pts; /// Number of incorrect PTS values so far
3195 int64_t pts_correction_num_faulty_dts; /// Number of incorrect DTS values so far
3196 int64_t pts_correction_last_pts; /// PTS of the last frame
3197 int64_t pts_correction_last_dts; /// DTS of the last frame
3200 * Character encoding of the input subtitles file.
3201 * - decoding: set by user
3202 * - encoding: unused
3207 * Subtitles character encoding mode. Formats or codecs might be adjusting
3208 * this setting (if they are doing the conversion themselves for instance).
3209 * - decoding: set by libavcodec
3210 * - encoding: unused
3212 int sub_charenc_mode;
3213 #define FF_SUB_CHARENC_MODE_DO_NOTHING -1 ///< do nothing (demuxer outputs a stream supposed to be already in UTF-8, or the codec is bitmap for instance)
3214 #define FF_SUB_CHARENC_MODE_AUTOMATIC 0 ///< libavcodec will select the mode itself
3215 #define FF_SUB_CHARENC_MODE_PRE_DECODER 1 ///< the AVPacket data needs to be recoded to UTF-8 before being fed to the decoder, requires iconv
3218 * Skip processing alpha if supported by codec.
3219 * Note that if the format uses pre-multiplied alpha (common with VP6,
3220 * and recommended due to better video quality/compression)
3221 * the image will look as if alpha-blended onto a black background.
3222 * However for formats that do not use pre-multiplied alpha
3223 * there might be serious artefacts (though e.g. libswscale currently
3224 * assumes pre-multiplied alpha anyway).
3225 * Code outside libavcodec should access this field using AVOptions
3227 * - decoding: set by user
3228 * - encoding: unused
3233 * Number of samples to skip after a discontinuity
3234 * - decoding: unused
3235 * - encoding: set by libavcodec
3239 #if !FF_API_DEBUG_MV
3241 * debug motion vectors
3242 * Code outside libavcodec should access this field using AVOptions
3243 * - encoding: Set by user.
3244 * - decoding: Set by user.
3247 #define FF_DEBUG_VIS_MV_P_FOR 0x00000001 //visualize forward predicted MVs of P frames
3248 #define FF_DEBUG_VIS_MV_B_FOR 0x00000002 //visualize forward predicted MVs of B frames
3249 #define FF_DEBUG_VIS_MV_B_BACK 0x00000004 //visualize backward predicted MVs of B frames
3253 * custom intra quantization matrix
3254 * Code outside libavcodec should access this field using av_codec_g/set_chroma_intra_matrix()
3255 * - encoding: Set by user, can be NULL.
3256 * - decoding: unused.
3258 uint16_t *chroma_intra_matrix;
3261 * dump format separator.
3262 * can be ", " or "\n " or anything else
3263 * Code outside libavcodec should access this field using AVOptions
3264 * (NO direct access).
3265 * - encoding: Set by user.
3266 * - decoding: Set by user.
3268 uint8_t *dump_separator;
3271 * ',' separated list of allowed decoders.
3272 * If NULL then all are allowed
3273 * - encoding: unused
3274 * - decoding: set by user through AVOPtions (NO direct access)
3276 char *codec_whitelist;
3279 * Properties of the stream that gets decoded
3280 * To be accessed through av_codec_get_properties() (NO direct access)
3281 * - encoding: unused
3282 * - decoding: set by libavcodec
3284 unsigned properties;
3285 #define FF_CODEC_PROPERTY_LOSSLESS 0x00000001
3286 #define FF_CODEC_PROPERTY_CLOSED_CAPTIONS 0x00000002
3289 AVRational av_codec_get_pkt_timebase (const AVCodecContext *avctx);
3290 void av_codec_set_pkt_timebase (AVCodecContext *avctx, AVRational val);
3292 const AVCodecDescriptor *av_codec_get_codec_descriptor(const AVCodecContext *avctx);
3293 void av_codec_set_codec_descriptor(AVCodecContext *avctx, const AVCodecDescriptor *desc);
3295 unsigned av_codec_get_codec_properties(const AVCodecContext *avctx);
3297 int av_codec_get_lowres(const AVCodecContext *avctx);
3298 void av_codec_set_lowres(AVCodecContext *avctx, int val);
3300 int av_codec_get_seek_preroll(const AVCodecContext *avctx);
3301 void av_codec_set_seek_preroll(AVCodecContext *avctx, int val);
3303 uint16_t *av_codec_get_chroma_intra_matrix(const AVCodecContext *avctx);
3304 void av_codec_set_chroma_intra_matrix(AVCodecContext *avctx, uint16_t *val);
3309 typedef struct AVProfile {
3311 const char *name; ///< short name for the profile
3314 typedef struct AVCodecDefault AVCodecDefault;
3321 typedef struct AVCodec {
3323 * Name of the codec implementation.
3324 * The name is globally unique among encoders and among decoders (but an
3325 * encoder and a decoder can share the same name).
3326 * This is the primary way to find a codec from the user perspective.
3330 * Descriptive name for the codec, meant to be more human readable than name.
3331 * You should use the NULL_IF_CONFIG_SMALL() macro to define it.
3333 const char *long_name;
3334 enum AVMediaType type;
3337 * Codec capabilities.
3338 * see AV_CODEC_CAP_*
3341 const AVRational *supported_framerates; ///< array of supported framerates, or NULL if any, array is terminated by {0,0}
3342 const enum AVPixelFormat *pix_fmts; ///< array of supported pixel formats, or NULL if unknown, array is terminated by -1
3343 const int *supported_samplerates; ///< array of supported audio samplerates, or NULL if unknown, array is terminated by 0
3344 const enum AVSampleFormat *sample_fmts; ///< array of supported sample formats, or NULL if unknown, array is terminated by -1
3345 const uint64_t *channel_layouts; ///< array of support channel layouts, or NULL if unknown. array is terminated by 0
3346 uint8_t max_lowres; ///< maximum value for lowres supported by the decoder, no direct access, use av_codec_get_max_lowres()
3347 const AVClass *priv_class; ///< AVClass for the private context
3348 const AVProfile *profiles; ///< array of recognized profiles, or NULL if unknown, array is terminated by {FF_PROFILE_UNKNOWN}
3350 /*****************************************************************
3351 * No fields below this line are part of the public API. They
3352 * may not be used outside of libavcodec and can be changed and
3354 * New public fields should be added right above.
3355 *****************************************************************
3358 struct AVCodec *next;
3360 * @name Frame-level threading support functions
3364 * If defined, called on thread contexts when they are created.
3365 * If the codec allocates writable tables in init(), re-allocate them here.
3366 * priv_data will be set to a copy of the original.
3368 int (*init_thread_copy)(AVCodecContext *);
3370 * Copy necessary context variables from a previous thread context to the current one.
3371 * If not defined, the next thread will start automatically; otherwise, the codec
3372 * must call ff_thread_finish_setup().
3374 * dst and src will (rarely) point to the same context, in which case memcpy should be skipped.
3376 int (*update_thread_context)(AVCodecContext *dst, const AVCodecContext *src);
3380 * Private codec-specific defaults.
3382 const AVCodecDefault *defaults;
3385 * Initialize codec static data, called from avcodec_register().
3387 void (*init_static_data)(struct AVCodec *codec);
3389 int (*init)(AVCodecContext *);
3390 int (*encode_sub)(AVCodecContext *, uint8_t *buf, int buf_size,
3391 const struct AVSubtitle *sub);
3393 * Encode data to an AVPacket.
3395 * @param avctx codec context
3396 * @param avpkt output AVPacket (may contain a user-provided buffer)
3397 * @param[in] frame AVFrame containing the raw data to be encoded
3398 * @param[out] got_packet_ptr encoder sets to 0 or 1 to indicate that a
3399 * non-empty packet was returned in avpkt.
3400 * @return 0 on success, negative error code on failure
3402 int (*encode2)(AVCodecContext *avctx, AVPacket *avpkt, const AVFrame *frame,
3403 int *got_packet_ptr);
3404 int (*decode)(AVCodecContext *, void *outdata, int *outdata_size, AVPacket *avpkt);
3405 int (*close)(AVCodecContext *);
3408 * Will be called when seeking
3410 void (*flush)(AVCodecContext *);
3412 * Internal codec capabilities.
3413 * See FF_CODEC_CAP_* in internal.h
3418 int av_codec_get_max_lowres(const AVCodec *codec);
3420 struct MpegEncContext;
3423 * @defgroup lavc_hwaccel AVHWAccel
3426 typedef struct AVHWAccel {
3428 * Name of the hardware accelerated codec.
3429 * The name is globally unique among encoders and among decoders (but an
3430 * encoder and a decoder can share the same name).
3435 * Type of codec implemented by the hardware accelerator.
3437 * See AVMEDIA_TYPE_xxx
3439 enum AVMediaType type;
3442 * Codec implemented by the hardware accelerator.
3444 * See AV_CODEC_ID_xxx
3449 * Supported pixel format.
3451 * Only hardware accelerated formats are supported here.
3453 enum AVPixelFormat pix_fmt;
3456 * Hardware accelerated codec capabilities.
3457 * see HWACCEL_CODEC_CAP_*
3461 /*****************************************************************
3462 * No fields below this line are part of the public API. They
3463 * may not be used outside of libavcodec and can be changed and
3465 * New public fields should be added right above.
3466 *****************************************************************
3468 struct AVHWAccel *next;
3471 * Allocate a custom buffer
3473 int (*alloc_frame)(AVCodecContext *avctx, AVFrame *frame);
3476 * Called at the beginning of each frame or field picture.
3478 * Meaningful frame information (codec specific) is guaranteed to
3479 * be parsed at this point. This function is mandatory.
3481 * Note that buf can be NULL along with buf_size set to 0.
3482 * Otherwise, this means the whole frame is available at this point.
3484 * @param avctx the codec context
3485 * @param buf the frame data buffer base
3486 * @param buf_size the size of the frame in bytes
3487 * @return zero if successful, a negative value otherwise
3489 int (*start_frame)(AVCodecContext *avctx, const uint8_t *buf, uint32_t buf_size);
3492 * Callback for each slice.
3494 * Meaningful slice information (codec specific) is guaranteed to
3495 * be parsed at this point. This function is mandatory.
3496 * The only exception is XvMC, that works on MB level.
3498 * @param avctx the codec context
3499 * @param buf the slice data buffer base
3500 * @param buf_size the size of the slice in bytes
3501 * @return zero if successful, a negative value otherwise
3503 int (*decode_slice)(AVCodecContext *avctx, const uint8_t *buf, uint32_t buf_size);
3506 * Called at the end of each frame or field picture.
3508 * The whole picture is parsed at this point and can now be sent
3509 * to the hardware accelerator. This function is mandatory.
3511 * @param avctx the codec context
3512 * @return zero if successful, a negative value otherwise
3514 int (*end_frame)(AVCodecContext *avctx);
3517 * Size of per-frame hardware accelerator private data.
3519 * Private data is allocated with av_mallocz() before
3520 * AVCodecContext.get_buffer() and deallocated after
3521 * AVCodecContext.release_buffer().
3523 int frame_priv_data_size;
3526 * Called for every Macroblock in a slice.
3528 * XvMC uses it to replace the ff_mpv_decode_mb().
3529 * Instead of decoding to raw picture, MB parameters are
3530 * stored in an array provided by the video driver.
3532 * @param s the mpeg context
3534 void (*decode_mb)(struct MpegEncContext *s);
3537 * Initialize the hwaccel private data.
3539 * This will be called from ff_get_format(), after hwaccel and
3540 * hwaccel_context are set and the hwaccel private data in AVCodecInternal
3543 int (*init)(AVCodecContext *avctx);
3546 * Uninitialize the hwaccel private data.
3548 * This will be called from get_format() or avcodec_close(), after hwaccel
3549 * and hwaccel_context are already uninitialized.
3551 int (*uninit)(AVCodecContext *avctx);
3554 * Size of the private data to allocate in
3555 * AVCodecInternal.hwaccel_priv_data.
3561 * Hardware acceleration should be used for decoding even if the codec level
3562 * used is unknown or higher than the maximum supported level reported by the
3565 * It's generally a good idea to pass this flag unless you have a specific
3566 * reason not to, as hardware tends to under-report supported levels.
3568 #define AV_HWACCEL_FLAG_IGNORE_LEVEL (1 << 0)
3571 * Hardware acceleration can output YUV pixel formats with a different chroma
3572 * sampling than 4:2:0 and/or other than 8 bits per component.
3574 #define AV_HWACCEL_FLAG_ALLOW_HIGH_DEPTH (1 << 1)
3580 #if FF_API_AVPICTURE
3582 * @defgroup lavc_picture AVPicture
3584 * Functions for working with AVPicture
3589 * Picture data structure.
3591 * Up to four components can be stored into it, the last component is
3593 * @deprecated use AVFrame or imgutils functions instead
3595 typedef struct AVPicture {
3596 attribute_deprecated
3597 uint8_t *data[AV_NUM_DATA_POINTERS]; ///< pointers to the image data planes
3598 attribute_deprecated
3599 int linesize[AV_NUM_DATA_POINTERS]; ///< number of bytes per line
3607 enum AVSubtitleType {
3610 SUBTITLE_BITMAP, ///< A bitmap, pict will be set
3613 * Plain text, the text field must be set by the decoder and is
3614 * authoritative. ass and pict fields may contain approximations.
3619 * Formatted text, the ass field must be set by the decoder and is
3620 * authoritative. pict and text fields may contain approximations.
3625 #define AV_SUBTITLE_FLAG_FORCED 0x00000001
3627 typedef struct AVSubtitleRect {
3628 int x; ///< top left corner of pict, undefined when pict is not set
3629 int y; ///< top left corner of pict, undefined when pict is not set
3630 int w; ///< width of pict, undefined when pict is not set
3631 int h; ///< height of pict, undefined when pict is not set
3632 int nb_colors; ///< number of colors in pict, undefined when pict is not set
3634 #if FF_API_AVPICTURE
3636 * @deprecated unused
3638 attribute_deprecated
3642 * data+linesize for the bitmap of this subtitle.
3643 * Can be set for text/ass as well once they are rendered.
3648 enum AVSubtitleType type;
3650 char *text; ///< 0 terminated plain UTF-8 text
3653 * 0 terminated ASS/SSA compatible event line.
3654 * The presentation of this is unaffected by the other values in this
3662 typedef struct AVSubtitle {
3663 uint16_t format; /* 0 = graphics */
3664 uint32_t start_display_time; /* relative to packet pts, in ms */
3665 uint32_t end_display_time; /* relative to packet pts, in ms */
3667 AVSubtitleRect **rects;
3668 int64_t pts; ///< Same as packet pts, in AV_TIME_BASE
3672 * If c is NULL, returns the first registered codec,
3673 * if c is non-NULL, returns the next registered codec after c,
3674 * or NULL if c is the last one.
3676 AVCodec *av_codec_next(const AVCodec *c);
3679 * Return the LIBAVCODEC_VERSION_INT constant.
3681 unsigned avcodec_version(void);
3684 * Return the libavcodec build-time configuration.
3686 const char *avcodec_configuration(void);
3689 * Return the libavcodec license.
3691 const char *avcodec_license(void);
3694 * Register the codec codec and initialize libavcodec.
3696 * @warning either this function or avcodec_register_all() must be called
3697 * before any other libavcodec functions.
3699 * @see avcodec_register_all()
3701 void avcodec_register(AVCodec *codec);
3704 * Register all the codecs, parsers and bitstream filters which were enabled at
3705 * configuration time. If you do not call this function you can select exactly
3706 * which formats you want to support, by using the individual registration
3709 * @see avcodec_register
3710 * @see av_register_codec_parser
3711 * @see av_register_bitstream_filter
3713 void avcodec_register_all(void);
3716 * Allocate an AVCodecContext and set its fields to default values. The
3717 * resulting struct should be freed with avcodec_free_context().
3719 * @param codec if non-NULL, allocate private data and initialize defaults
3720 * for the given codec. It is illegal to then call avcodec_open2()
3721 * with a different codec.
3722 * If NULL, then the codec-specific defaults won't be initialized,
3723 * which may result in suboptimal default settings (this is
3724 * important mainly for encoders, e.g. libx264).
3726 * @return An AVCodecContext filled with default values or NULL on failure.
3727 * @see avcodec_get_context_defaults
3729 AVCodecContext *avcodec_alloc_context3(const AVCodec *codec);
3732 * Free the codec context and everything associated with it and write NULL to
3733 * the provided pointer.
3735 void avcodec_free_context(AVCodecContext **avctx);
3738 * Set the fields of the given AVCodecContext to default values corresponding
3739 * to the given codec (defaults may be codec-dependent).
3741 * Do not call this function if a non-NULL codec has been passed
3742 * to avcodec_alloc_context3() that allocated this AVCodecContext.
3743 * If codec is non-NULL, it is illegal to call avcodec_open2() with a
3744 * different codec on this AVCodecContext.
3746 int avcodec_get_context_defaults3(AVCodecContext *s, const AVCodec *codec);
3749 * Get the AVClass for AVCodecContext. It can be used in combination with
3750 * AV_OPT_SEARCH_FAKE_OBJ for examining options.
3752 * @see av_opt_find().
3754 const AVClass *avcodec_get_class(void);
3757 * Get the AVClass for AVFrame. It can be used in combination with
3758 * AV_OPT_SEARCH_FAKE_OBJ for examining options.
3760 * @see av_opt_find().
3762 const AVClass *avcodec_get_frame_class(void);
3765 * Get the AVClass for AVSubtitleRect. It can be used in combination with
3766 * AV_OPT_SEARCH_FAKE_OBJ for examining options.
3768 * @see av_opt_find().
3770 const AVClass *avcodec_get_subtitle_rect_class(void);
3773 * Copy the settings of the source AVCodecContext into the destination
3774 * AVCodecContext. The resulting destination codec context will be
3775 * unopened, i.e. you are required to call avcodec_open2() before you
3776 * can use this AVCodecContext to decode/encode video/audio data.
3778 * @param dest target codec context, should be initialized with
3779 * avcodec_alloc_context3(NULL), but otherwise uninitialized
3780 * @param src source codec context
3781 * @return AVERROR() on error (e.g. memory allocation error), 0 on success
3783 int avcodec_copy_context(AVCodecContext *dest, const AVCodecContext *src);
3786 * Initialize the AVCodecContext to use the given AVCodec. Prior to using this
3787 * function the context has to be allocated with avcodec_alloc_context3().
3789 * The functions avcodec_find_decoder_by_name(), avcodec_find_encoder_by_name(),
3790 * avcodec_find_decoder() and avcodec_find_encoder() provide an easy way for
3791 * retrieving a codec.
3793 * @warning This function is not thread safe!
3795 * @note Always call this function before using decoding routines (such as
3796 * @ref avcodec_decode_video2()).
3799 * avcodec_register_all();
3800 * av_dict_set(&opts, "b", "2.5M", 0);
3801 * codec = avcodec_find_decoder(AV_CODEC_ID_H264);
3805 * context = avcodec_alloc_context3(codec);
3807 * if (avcodec_open2(context, codec, opts) < 0)
3811 * @param avctx The context to initialize.
3812 * @param codec The codec to open this context for. If a non-NULL codec has been
3813 * previously passed to avcodec_alloc_context3() or
3814 * avcodec_get_context_defaults3() for this context, then this
3815 * parameter MUST be either NULL or equal to the previously passed
3817 * @param options A dictionary filled with AVCodecContext and codec-private options.
3818 * On return this object will be filled with options that were not found.
3820 * @return zero on success, a negative value on error
3821 * @see avcodec_alloc_context3(), avcodec_find_decoder(), avcodec_find_encoder(),
3822 * av_dict_set(), av_opt_find().
3824 int avcodec_open2(AVCodecContext *avctx, const AVCodec *codec, AVDictionary **options);
3827 * Close a given AVCodecContext and free all the data associated with it
3828 * (but not the AVCodecContext itself).
3830 * Calling this function on an AVCodecContext that hasn't been opened will free
3831 * the codec-specific data allocated in avcodec_alloc_context3() /
3832 * avcodec_get_context_defaults3() with a non-NULL codec. Subsequent calls will
3835 int avcodec_close(AVCodecContext *avctx);
3838 * Free all allocated data in the given subtitle struct.
3840 * @param sub AVSubtitle to free.
3842 void avsubtitle_free(AVSubtitle *sub);
3849 * @addtogroup lavc_packet
3854 * Allocate an AVPacket and set its fields to default values. The resulting
3855 * struct must be freed using av_packet_free().
3857 * @return An AVPacket filled with default values or NULL on failure.
3859 * @note this only allocates the AVPacket itself, not the data buffers. Those
3860 * must be allocated through other means such as av_new_packet.
3862 * @see av_new_packet
3864 AVPacket *av_packet_alloc(void);
3867 * Create a new packet that references the same data as src.
3869 * This is a shortcut for av_packet_alloc()+av_packet_ref().
3871 * @return newly created AVPacket on success, NULL on error.
3873 * @see av_packet_alloc
3874 * @see av_packet_ref
3876 AVPacket *av_packet_clone(AVPacket *src);
3879 * Free the packet, if the packet is reference counted, it will be
3880 * unreferenced first.
3882 * @param packet packet to be freed. The pointer will be set to NULL.
3883 * @note passing NULL is a no-op.
3885 void av_packet_free(AVPacket **pkt);
3888 * Initialize optional fields of a packet with default values.
3890 * Note, this does not touch the data and size members, which have to be
3891 * initialized separately.
3895 void av_init_packet(AVPacket *pkt);
3898 * Allocate the payload of a packet and initialize its fields with
3902 * @param size wanted payload size
3903 * @return 0 if OK, AVERROR_xxx otherwise
3905 int av_new_packet(AVPacket *pkt, int size);
3908 * Reduce packet size, correctly zeroing padding
3911 * @param size new size
3913 void av_shrink_packet(AVPacket *pkt, int size);
3916 * Increase packet size, correctly zeroing padding
3919 * @param grow_by number of bytes by which to increase the size of the packet
3921 int av_grow_packet(AVPacket *pkt, int grow_by);
3924 * Initialize a reference-counted packet from av_malloc()ed data.
3926 * @param pkt packet to be initialized. This function will set the data, size,
3927 * buf and destruct fields, all others are left untouched.
3928 * @param data Data allocated by av_malloc() to be used as packet data. If this
3929 * function returns successfully, the data is owned by the underlying AVBuffer.
3930 * The caller may not access the data through other means.
3931 * @param size size of data in bytes, without the padding. I.e. the full buffer
3932 * size is assumed to be size + AV_INPUT_BUFFER_PADDING_SIZE.
3934 * @return 0 on success, a negative AVERROR on error
3936 int av_packet_from_data(AVPacket *pkt, uint8_t *data, int size);
3938 #if FF_API_AVPACKET_OLD_API
3940 * @warning This is a hack - the packet memory allocation stuff is broken. The
3941 * packet is allocated if it was not really allocated.
3943 * @deprecated Use av_packet_ref
3945 attribute_deprecated
3946 int av_dup_packet(AVPacket *pkt);
3948 * Copy packet, including contents
3950 * @return 0 on success, negative AVERROR on fail
3952 int av_copy_packet(AVPacket *dst, const AVPacket *src);
3955 * Copy packet side data
3957 * @return 0 on success, negative AVERROR on fail
3959 int av_copy_packet_side_data(AVPacket *dst, const AVPacket *src);
3964 * @deprecated Use av_packet_unref
3966 * @param pkt packet to free
3968 attribute_deprecated
3969 void av_free_packet(AVPacket *pkt);
3972 * Allocate new information of a packet.
3975 * @param type side information type
3976 * @param size side information size
3977 * @return pointer to fresh allocated data or NULL otherwise
3979 uint8_t* av_packet_new_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
3983 * Shrink the already allocated side data buffer
3986 * @param type side information type
3987 * @param size new side information size
3988 * @return 0 on success, < 0 on failure
3990 int av_packet_shrink_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
3994 * Get side information from packet.
3997 * @param type desired side information type
3998 * @param size pointer for side information size to store (optional)
3999 * @return pointer to data if present or NULL otherwise
4001 uint8_t* av_packet_get_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
4004 int av_packet_merge_side_data(AVPacket *pkt);
4006 int av_packet_split_side_data(AVPacket *pkt);
4008 const char *av_packet_side_data_name(enum AVPacketSideDataType type);
4011 * Pack a dictionary for use in side_data.
4013 * @param dict The dictionary to pack.
4014 * @param size pointer to store the size of the returned data
4015 * @return pointer to data if successful, NULL otherwise
4017 uint8_t *av_packet_pack_dictionary(AVDictionary *dict, int *size);
4019 * Unpack a dictionary from side_data.
4021 * @param data data from side_data
4022 * @param size size of the data
4023 * @param dict the metadata storage dictionary
4024 * @return 0 on success, < 0 on failure
4026 int av_packet_unpack_dictionary(const uint8_t *data, int size, AVDictionary **dict);
4030 * Convenience function to free all the side data stored.
4031 * All the other fields stay untouched.
4035 void av_packet_free_side_data(AVPacket *pkt);
4038 * Setup a new reference to the data described by a given packet
4040 * If src is reference-counted, setup dst as a new reference to the
4041 * buffer in src. Otherwise allocate a new buffer in dst and copy the
4042 * data from src into it.
4044 * All the other fields are copied from src.
4046 * @see av_packet_unref
4048 * @param dst Destination packet
4049 * @param src Source packet
4051 * @return 0 on success, a negative AVERROR on error.
4053 int av_packet_ref(AVPacket *dst, const AVPacket *src);
4058 * Unreference the buffer referenced by the packet and reset the
4059 * remaining packet fields to their default values.
4061 * @param pkt The packet to be unreferenced.
4063 void av_packet_unref(AVPacket *pkt);
4066 * Move every field in src to dst and reset src.
4068 * @see av_packet_unref
4070 * @param src Source packet, will be reset
4071 * @param dst Destination packet
4073 void av_packet_move_ref(AVPacket *dst, AVPacket *src);
4076 * Copy only "properties" fields from src to dst.
4078 * Properties for the purpose of this function are all the fields
4079 * beside those related to the packet data (buf, data, size)
4081 * @param dst Destination packet
4082 * @param src Source packet
4084 * @return 0 on success AVERROR on failure.
4087 int av_packet_copy_props(AVPacket *dst, const AVPacket *src);
4090 * Convert valid timing fields (timestamps / durations) in a packet from one
4091 * timebase to another. Timestamps with unknown values (AV_NOPTS_VALUE) will be
4094 * @param pkt packet on which the conversion will be performed
4095 * @param tb_src source timebase, in which the timing fields in pkt are
4097 * @param tb_dst destination timebase, to which the timing fields will be
4100 void av_packet_rescale_ts(AVPacket *pkt, AVRational tb_src, AVRational tb_dst);
4107 * @addtogroup lavc_decoding
4112 * Find a registered decoder with a matching codec ID.
4114 * @param id AVCodecID of the requested decoder
4115 * @return A decoder if one was found, NULL otherwise.
4117 AVCodec *avcodec_find_decoder(enum AVCodecID id);
4120 * Find a registered decoder with the specified name.
4122 * @param name name of the requested decoder
4123 * @return A decoder if one was found, NULL otherwise.
4125 AVCodec *avcodec_find_decoder_by_name(const char *name);
4128 * The default callback for AVCodecContext.get_buffer2(). It is made public so
4129 * it can be called by custom get_buffer2() implementations for decoders without
4130 * AV_CODEC_CAP_DR1 set.
4132 int avcodec_default_get_buffer2(AVCodecContext *s, AVFrame *frame, int flags);
4136 * Return the amount of padding in pixels which the get_buffer callback must
4137 * provide around the edge of the image for codecs which do not have the
4138 * CODEC_FLAG_EMU_EDGE flag.
4140 * @return Required padding in pixels.
4142 * @deprecated CODEC_FLAG_EMU_EDGE is deprecated, so this function is no longer
4145 attribute_deprecated
4146 unsigned avcodec_get_edge_width(void);
4150 * Modify width and height values so that they will result in a memory
4151 * buffer that is acceptable for the codec if you do not use any horizontal
4154 * May only be used if a codec with AV_CODEC_CAP_DR1 has been opened.
4156 void avcodec_align_dimensions(AVCodecContext *s, int *width, int *height);
4159 * Modify width and height values so that they will result in a memory
4160 * buffer that is acceptable for the codec if you also ensure that all
4161 * line sizes are a multiple of the respective linesize_align[i].
4163 * May only be used if a codec with AV_CODEC_CAP_DR1 has been opened.
4165 void avcodec_align_dimensions2(AVCodecContext *s, int *width, int *height,
4166 int linesize_align[AV_NUM_DATA_POINTERS]);
4169 * Converts AVChromaLocation to swscale x/y chroma position.
4171 * The positions represent the chroma (0,0) position in a coordinates system
4172 * with luma (0,0) representing the origin and luma(1,1) representing 256,256
4174 * @param xpos horizontal chroma sample position
4175 * @param ypos vertical chroma sample position
4177 int avcodec_enum_to_chroma_pos(int *xpos, int *ypos, enum AVChromaLocation pos);
4180 * Converts swscale x/y chroma position to AVChromaLocation.
4182 * The positions represent the chroma (0,0) position in a coordinates system
4183 * with luma (0,0) representing the origin and luma(1,1) representing 256,256
4185 * @param xpos horizontal chroma sample position
4186 * @param ypos vertical chroma sample position
4188 enum AVChromaLocation avcodec_chroma_pos_to_enum(int xpos, int ypos);
4191 * Decode the audio frame of size avpkt->size from avpkt->data into frame.
4193 * Some decoders may support multiple frames in a single AVPacket. Such
4194 * decoders would then just decode the first frame and the return value would be
4195 * less than the packet size. In this case, avcodec_decode_audio4 has to be
4196 * called again with an AVPacket containing the remaining data in order to
4197 * decode the second frame, etc... Even if no frames are returned, the packet
4198 * needs to be fed to the decoder with remaining data until it is completely
4199 * consumed or an error occurs.
4201 * Some decoders (those marked with AV_CODEC_CAP_DELAY) have a delay between input
4202 * and output. This means that for some packets they will not immediately
4203 * produce decoded output and need to be flushed at the end of decoding to get
4204 * all the decoded data. Flushing is done by calling this function with packets
4205 * with avpkt->data set to NULL and avpkt->size set to 0 until it stops
4206 * returning samples. It is safe to flush even those decoders that are not
4207 * marked with AV_CODEC_CAP_DELAY, then no samples will be returned.
4209 * @warning The input buffer, avpkt->data must be AV_INPUT_BUFFER_PADDING_SIZE
4210 * larger than the actual read bytes because some optimized bitstream
4211 * readers read 32 or 64 bits at once and could read over the end.
4213 * @note The AVCodecContext MUST have been opened with @ref avcodec_open2()
4214 * before packets may be fed to the decoder.
4216 * @param avctx the codec context
4217 * @param[out] frame The AVFrame in which to store decoded audio samples.
4218 * The decoder will allocate a buffer for the decoded frame by
4219 * calling the AVCodecContext.get_buffer2() callback.
4220 * When AVCodecContext.refcounted_frames is set to 1, the frame is
4221 * reference counted and the returned reference belongs to the
4222 * caller. The caller must release the frame using av_frame_unref()
4223 * when the frame is no longer needed. The caller may safely write
4224 * to the frame if av_frame_is_writable() returns 1.
4225 * When AVCodecContext.refcounted_frames is set to 0, the returned
4226 * reference belongs to the decoder and is valid only until the
4227 * next call to this function or until closing or flushing the
4228 * decoder. The caller may not write to it.
4229 * @param[out] got_frame_ptr Zero if no frame could be decoded, otherwise it is
4230 * non-zero. Note that this field being set to zero
4231 * does not mean that an error has occurred. For
4232 * decoders with AV_CODEC_CAP_DELAY set, no given decode
4233 * call is guaranteed to produce a frame.
4234 * @param[in] avpkt The input AVPacket containing the input buffer.
4235 * At least avpkt->data and avpkt->size should be set. Some
4236 * decoders might also require additional fields to be set.
4237 * @return A negative error code is returned if an error occurred during
4238 * decoding, otherwise the number of bytes consumed from the input
4239 * AVPacket is returned.
4241 int avcodec_decode_audio4(AVCodecContext *avctx, AVFrame *frame,
4242 int *got_frame_ptr, const AVPacket *avpkt);
4245 * Decode the video frame of size avpkt->size from avpkt->data into picture.
4246 * Some decoders may support multiple frames in a single AVPacket, such
4247 * decoders would then just decode the first frame.
4249 * @warning The input buffer must be AV_INPUT_BUFFER_PADDING_SIZE larger than
4250 * the actual read bytes because some optimized bitstream readers read 32 or 64
4251 * bits at once and could read over the end.
4253 * @warning The end of the input buffer buf should be set to 0 to ensure that
4254 * no overreading happens for damaged MPEG streams.
4256 * @note Codecs which have the AV_CODEC_CAP_DELAY capability set have a delay
4257 * between input and output, these need to be fed with avpkt->data=NULL,
4258 * avpkt->size=0 at the end to return the remaining frames.
4260 * @note The AVCodecContext MUST have been opened with @ref avcodec_open2()
4261 * before packets may be fed to the decoder.
4263 * @param avctx the codec context
4264 * @param[out] picture The AVFrame in which the decoded video frame will be stored.
4265 * Use av_frame_alloc() to get an AVFrame. The codec will
4266 * allocate memory for the actual bitmap by calling the
4267 * AVCodecContext.get_buffer2() callback.
4268 * When AVCodecContext.refcounted_frames is set to 1, the frame is
4269 * reference counted and the returned reference belongs to the
4270 * caller. The caller must release the frame using av_frame_unref()
4271 * when the frame is no longer needed. The caller may safely write
4272 * to the frame if av_frame_is_writable() returns 1.
4273 * When AVCodecContext.refcounted_frames is set to 0, the returned
4274 * reference belongs to the decoder and is valid only until the
4275 * next call to this function or until closing or flushing the
4276 * decoder. The caller may not write to it.
4278 * @param[in] avpkt The input AVPacket containing the input buffer.
4279 * You can create such packet with av_init_packet() and by then setting
4280 * data and size, some decoders might in addition need other fields like
4281 * flags&AV_PKT_FLAG_KEY. All decoders are designed to use the least
4283 * @param[in,out] got_picture_ptr Zero if no frame could be decompressed, otherwise, it is nonzero.
4284 * @return On error a negative value is returned, otherwise the number of bytes
4285 * used or zero if no frame could be decompressed.
4287 int avcodec_decode_video2(AVCodecContext *avctx, AVFrame *picture,
4288 int *got_picture_ptr,
4289 const AVPacket *avpkt);
4292 * Decode a subtitle message.
4293 * Return a negative value on error, otherwise return the number of bytes used.
4294 * If no subtitle could be decompressed, got_sub_ptr is zero.
4295 * Otherwise, the subtitle is stored in *sub.
4296 * Note that AV_CODEC_CAP_DR1 is not available for subtitle codecs. This is for
4297 * simplicity, because the performance difference is expect to be negligible
4298 * and reusing a get_buffer written for video codecs would probably perform badly
4299 * due to a potentially very different allocation pattern.
4301 * Some decoders (those marked with CODEC_CAP_DELAY) have a delay between input
4302 * and output. This means that for some packets they will not immediately
4303 * produce decoded output and need to be flushed at the end of decoding to get
4304 * all the decoded data. Flushing is done by calling this function with packets
4305 * with avpkt->data set to NULL and avpkt->size set to 0 until it stops
4306 * returning subtitles. It is safe to flush even those decoders that are not
4307 * marked with CODEC_CAP_DELAY, then no subtitles will be returned.
4309 * @note The AVCodecContext MUST have been opened with @ref avcodec_open2()
4310 * before packets may be fed to the decoder.
4312 * @param avctx the codec context
4313 * @param[out] sub The Preallocated AVSubtitle in which the decoded subtitle will be stored,
4314 * must be freed with avsubtitle_free if *got_sub_ptr is set.
4315 * @param[in,out] got_sub_ptr Zero if no subtitle could be decompressed, otherwise, it is nonzero.
4316 * @param[in] avpkt The input AVPacket containing the input buffer.
4318 int avcodec_decode_subtitle2(AVCodecContext *avctx, AVSubtitle *sub,
4323 * @defgroup lavc_parsing Frame parsing
4327 enum AVPictureStructure {
4328 AV_PICTURE_STRUCTURE_UNKNOWN, //< unknown
4329 AV_PICTURE_STRUCTURE_TOP_FIELD, //< coded as top field
4330 AV_PICTURE_STRUCTURE_BOTTOM_FIELD, //< coded as bottom field
4331 AV_PICTURE_STRUCTURE_FRAME, //< coded as frame
4334 typedef struct AVCodecParserContext {
4336 struct AVCodecParser *parser;
4337 int64_t frame_offset; /* offset of the current frame */
4338 int64_t cur_offset; /* current offset
4339 (incremented by each av_parser_parse()) */
4340 int64_t next_frame_offset; /* offset of the next frame */
4342 int pict_type; /* XXX: Put it back in AVCodecContext. */
4344 * This field is used for proper frame duration computation in lavf.
4345 * It signals, how much longer the frame duration of the current frame
4346 * is compared to normal frame duration.
4348 * frame_duration = (1 + repeat_pict) * time_base
4350 * It is used by codecs like H.264 to display telecined material.
4352 int repeat_pict; /* XXX: Put it back in AVCodecContext. */
4353 int64_t pts; /* pts of the current frame */
4354 int64_t dts; /* dts of the current frame */
4359 int fetch_timestamp;
4361 #define AV_PARSER_PTS_NB 4
4362 int cur_frame_start_index;
4363 int64_t cur_frame_offset[AV_PARSER_PTS_NB];
4364 int64_t cur_frame_pts[AV_PARSER_PTS_NB];
4365 int64_t cur_frame_dts[AV_PARSER_PTS_NB];
4368 #define PARSER_FLAG_COMPLETE_FRAMES 0x0001
4369 #define PARSER_FLAG_ONCE 0x0002
4370 /// Set if the parser has a valid file offset
4371 #define PARSER_FLAG_FETCHED_OFFSET 0x0004
4372 #define PARSER_FLAG_USE_CODEC_TS 0x1000
4374 int64_t offset; ///< byte offset from starting packet start
4375 int64_t cur_frame_end[AV_PARSER_PTS_NB];
4378 * Set by parser to 1 for key frames and 0 for non-key frames.
4379 * It is initialized to -1, so if the parser doesn't set this flag,
4380 * old-style fallback using AV_PICTURE_TYPE_I picture type as key frames
4385 #if FF_API_CONVERGENCE_DURATION
4387 * @deprecated unused
4389 attribute_deprecated
4390 int64_t convergence_duration;
4393 // Timestamp generation support:
4395 * Synchronization point for start of timestamp generation.
4397 * Set to >0 for sync point, 0 for no sync point and <0 for undefined
4400 * For example, this corresponds to presence of H.264 buffering period
4406 * Offset of the current timestamp against last timestamp sync point in
4407 * units of AVCodecContext.time_base.
4409 * Set to INT_MIN when dts_sync_point unused. Otherwise, it must
4410 * contain a valid timestamp offset.
4412 * Note that the timestamp of sync point has usually a nonzero
4413 * dts_ref_dts_delta, which refers to the previous sync point. Offset of
4414 * the next frame after timestamp sync point will be usually 1.
4416 * For example, this corresponds to H.264 cpb_removal_delay.
4418 int dts_ref_dts_delta;
4421 * Presentation delay of current frame in units of AVCodecContext.time_base.
4423 * Set to INT_MIN when dts_sync_point unused. Otherwise, it must
4424 * contain valid non-negative timestamp delta (presentation time of a frame
4425 * must not lie in the past).
4427 * This delay represents the difference between decoding and presentation
4428 * time of the frame.
4430 * For example, this corresponds to H.264 dpb_output_delay.
4435 * Position of the packet in file.
4437 * Analogous to cur_frame_pts/dts
4439 int64_t cur_frame_pos[AV_PARSER_PTS_NB];
4442 * Byte position of currently parsed frame in stream.
4447 * Previous frame byte position.
4452 * Duration of the current frame.
4453 * For audio, this is in units of 1 / AVCodecContext.sample_rate.
4454 * For all other types, this is in units of AVCodecContext.time_base.
4458 enum AVFieldOrder field_order;
4461 * Indicate whether a picture is coded as a frame, top field or bottom field.
4463 * For example, H.264 field_pic_flag equal to 0 corresponds to
4464 * AV_PICTURE_STRUCTURE_FRAME. An H.264 picture with field_pic_flag
4465 * equal to 1 and bottom_field_flag equal to 0 corresponds to
4466 * AV_PICTURE_STRUCTURE_TOP_FIELD.
4468 enum AVPictureStructure picture_structure;
4471 * Picture number incremented in presentation or output order.
4472 * This field may be reinitialized at the first picture of a new sequence.
4474 * For example, this corresponds to H.264 PicOrderCnt.
4476 int output_picture_number;
4479 * Dimensions of the decoded video intended for presentation.
4485 * Dimensions of the coded video.
4491 * The format of the coded data, corresponds to enum AVPixelFormat for video
4492 * and for enum AVSampleFormat for audio.
4494 * Note that a decoder can have considerable freedom in how exactly it
4495 * decodes the data, so the format reported here might be different from the
4496 * one returned by a decoder.
4499 } AVCodecParserContext;
4501 typedef struct AVCodecParser {
4502 int codec_ids[5]; /* several codec IDs are permitted */
4504 int (*parser_init)(AVCodecParserContext *s);
4505 /* This callback never returns an error, a negative value means that
4506 * the frame start was in a previous packet. */
4507 int (*parser_parse)(AVCodecParserContext *s,
4508 AVCodecContext *avctx,
4509 const uint8_t **poutbuf, int *poutbuf_size,
4510 const uint8_t *buf, int buf_size);
4511 void (*parser_close)(AVCodecParserContext *s);
4512 int (*split)(AVCodecContext *avctx, const uint8_t *buf, int buf_size);
4513 struct AVCodecParser *next;
4516 AVCodecParser *av_parser_next(const AVCodecParser *c);
4518 void av_register_codec_parser(AVCodecParser *parser);
4519 AVCodecParserContext *av_parser_init(int codec_id);
4524 * @param s parser context.
4525 * @param avctx codec context.
4526 * @param poutbuf set to pointer to parsed buffer or NULL if not yet finished.
4527 * @param poutbuf_size set to size of parsed buffer or zero if not yet finished.
4528 * @param buf input buffer.
4529 * @param buf_size input length, to signal EOF, this should be 0 (so that the last frame can be output).
4530 * @param pts input presentation timestamp.
4531 * @param dts input decoding timestamp.
4532 * @param pos input byte position in stream.
4533 * @return the number of bytes of the input bitstream used.
4538 * len = av_parser_parse2(myparser, AVCodecContext, &data, &size,
4545 * decode_frame(data, size);
4549 int av_parser_parse2(AVCodecParserContext *s,
4550 AVCodecContext *avctx,
4551 uint8_t **poutbuf, int *poutbuf_size,
4552 const uint8_t *buf, int buf_size,
4553 int64_t pts, int64_t dts,
4557 * @return 0 if the output buffer is a subset of the input, 1 if it is allocated and must be freed
4558 * @deprecated use AVBitStreamFilter
4560 int av_parser_change(AVCodecParserContext *s,
4561 AVCodecContext *avctx,
4562 uint8_t **poutbuf, int *poutbuf_size,
4563 const uint8_t *buf, int buf_size, int keyframe);
4564 void av_parser_close(AVCodecParserContext *s);
4572 * @addtogroup lavc_encoding
4577 * Find a registered encoder with a matching codec ID.
4579 * @param id AVCodecID of the requested encoder
4580 * @return An encoder if one was found, NULL otherwise.
4582 AVCodec *avcodec_find_encoder(enum AVCodecID id);
4585 * Find a registered encoder with the specified name.
4587 * @param name name of the requested encoder
4588 * @return An encoder if one was found, NULL otherwise.
4590 AVCodec *avcodec_find_encoder_by_name(const char *name);
4593 * Encode a frame of audio.
4595 * Takes input samples from frame and writes the next output packet, if
4596 * available, to avpkt. The output packet does not necessarily contain data for
4597 * the most recent frame, as encoders can delay, split, and combine input frames
4598 * internally as needed.
4600 * @param avctx codec context
4601 * @param avpkt output AVPacket.
4602 * The user can supply an output buffer by setting
4603 * avpkt->data and avpkt->size prior to calling the
4604 * function, but if the size of the user-provided data is not
4605 * large enough, encoding will fail. If avpkt->data and
4606 * avpkt->size are set, avpkt->destruct must also be set. All
4607 * other AVPacket fields will be reset by the encoder using
4608 * av_init_packet(). If avpkt->data is NULL, the encoder will
4609 * allocate it. The encoder will set avpkt->size to the size
4610 * of the output packet.
4612 * If this function fails or produces no output, avpkt will be
4613 * freed using av_packet_unref().
4614 * @param[in] frame AVFrame containing the raw audio data to be encoded.
4615 * May be NULL when flushing an encoder that has the
4616 * AV_CODEC_CAP_DELAY capability set.
4617 * If AV_CODEC_CAP_VARIABLE_FRAME_SIZE is set, then each frame
4618 * can have any number of samples.
4619 * If it is not set, frame->nb_samples must be equal to
4620 * avctx->frame_size for all frames except the last.
4621 * The final frame may be smaller than avctx->frame_size.
4622 * @param[out] got_packet_ptr This field is set to 1 by libavcodec if the
4623 * output packet is non-empty, and to 0 if it is
4624 * empty. If the function returns an error, the
4625 * packet can be assumed to be invalid, and the
4626 * value of got_packet_ptr is undefined and should
4628 * @return 0 on success, negative error code on failure
4630 int avcodec_encode_audio2(AVCodecContext *avctx, AVPacket *avpkt,
4631 const AVFrame *frame, int *got_packet_ptr);
4634 * Encode a frame of video.
4636 * Takes input raw video data from frame and writes the next output packet, if
4637 * available, to avpkt. The output packet does not necessarily contain data for
4638 * the most recent frame, as encoders can delay and reorder input frames
4639 * internally as needed.
4641 * @param avctx codec context
4642 * @param avpkt output AVPacket.
4643 * The user can supply an output buffer by setting
4644 * avpkt->data and avpkt->size prior to calling the
4645 * function, but if the size of the user-provided data is not
4646 * large enough, encoding will fail. All other AVPacket fields
4647 * will be reset by the encoder using av_init_packet(). If
4648 * avpkt->data is NULL, the encoder will allocate it.
4649 * The encoder will set avpkt->size to the size of the
4650 * output packet. The returned data (if any) belongs to the
4651 * caller, he is responsible for freeing it.
4653 * If this function fails or produces no output, avpkt will be
4654 * freed using av_packet_unref().
4655 * @param[in] frame AVFrame containing the raw video data to be encoded.
4656 * May be NULL when flushing an encoder that has the
4657 * AV_CODEC_CAP_DELAY capability set.
4658 * @param[out] got_packet_ptr This field is set to 1 by libavcodec if the
4659 * output packet is non-empty, and to 0 if it is
4660 * empty. If the function returns an error, the
4661 * packet can be assumed to be invalid, and the
4662 * value of got_packet_ptr is undefined and should
4664 * @return 0 on success, negative error code on failure
4666 int avcodec_encode_video2(AVCodecContext *avctx, AVPacket *avpkt,
4667 const AVFrame *frame, int *got_packet_ptr);
4669 int avcodec_encode_subtitle(AVCodecContext *avctx, uint8_t *buf, int buf_size,
4670 const AVSubtitle *sub);
4677 #if FF_API_AVCODEC_RESAMPLE
4679 * @defgroup lavc_resample Audio resampling
4681 * @deprecated use libswresample instead
4685 struct ReSampleContext;
4686 struct AVResampleContext;
4688 typedef struct ReSampleContext ReSampleContext;
4691 * Initialize audio resampling context.
4693 * @param output_channels number of output channels
4694 * @param input_channels number of input channels
4695 * @param output_rate output sample rate
4696 * @param input_rate input sample rate
4697 * @param sample_fmt_out requested output sample format
4698 * @param sample_fmt_in input sample format
4699 * @param filter_length length of each FIR filter in the filterbank relative to the cutoff frequency
4700 * @param log2_phase_count log2 of the number of entries in the polyphase filterbank
4701 * @param linear if 1 then the used FIR filter will be linearly interpolated
4702 between the 2 closest, if 0 the closest will be used
4703 * @param cutoff cutoff frequency, 1.0 corresponds to half the output sampling rate
4704 * @return allocated ReSampleContext, NULL if error occurred
4706 attribute_deprecated
4707 ReSampleContext *av_audio_resample_init(int output_channels, int input_channels,
4708 int output_rate, int input_rate,
4709 enum AVSampleFormat sample_fmt_out,
4710 enum AVSampleFormat sample_fmt_in,
4711 int filter_length, int log2_phase_count,
4712 int linear, double cutoff);
4714 attribute_deprecated
4715 int audio_resample(ReSampleContext *s, short *output, short *input, int nb_samples);
4718 * Free resample context.
4720 * @param s a non-NULL pointer to a resample context previously
4721 * created with av_audio_resample_init()
4723 attribute_deprecated
4724 void audio_resample_close(ReSampleContext *s);
4728 * Initialize an audio resampler.
4729 * Note, if either rate is not an integer then simply scale both rates up so they are.
4730 * @param filter_length length of each FIR filter in the filterbank relative to the cutoff freq
4731 * @param log2_phase_count log2 of the number of entries in the polyphase filterbank
4732 * @param linear If 1 then the used FIR filter will be linearly interpolated
4733 between the 2 closest, if 0 the closest will be used
4734 * @param cutoff cutoff frequency, 1.0 corresponds to half the output sampling rate
4736 attribute_deprecated
4737 struct AVResampleContext *av_resample_init(int out_rate, int in_rate, int filter_length, int log2_phase_count, int linear, double cutoff);
4740 * Resample an array of samples using a previously configured context.
4741 * @param src an array of unconsumed samples
4742 * @param consumed the number of samples of src which have been consumed are returned here
4743 * @param src_size the number of unconsumed samples available
4744 * @param dst_size the amount of space in samples available in dst
4745 * @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.
4746 * @return the number of samples written in dst or -1 if an error occurred
4748 attribute_deprecated
4749 int av_resample(struct AVResampleContext *c, short *dst, short *src, int *consumed, int src_size, int dst_size, int update_ctx);
4753 * Compensate samplerate/timestamp drift. The compensation is done by changing
4754 * the resampler parameters, so no audible clicks or similar distortions occur
4755 * @param compensation_distance distance in output samples over which the compensation should be performed
4756 * @param sample_delta number of output samples which should be output less
4758 * example: av_resample_compensate(c, 10, 500)
4759 * here instead of 510 samples only 500 samples would be output
4761 * note, due to rounding the actual compensation might be slightly different,
4762 * especially if the compensation_distance is large and the in_rate used during init is small
4764 attribute_deprecated
4765 void av_resample_compensate(struct AVResampleContext *c, int sample_delta, int compensation_distance);
4766 attribute_deprecated
4767 void av_resample_close(struct AVResampleContext *c);
4774 #if FF_API_AVPICTURE
4776 * @addtogroup lavc_picture
4781 * @deprecated unused
4783 attribute_deprecated
4784 int avpicture_alloc(AVPicture *picture, enum AVPixelFormat pix_fmt, int width, int height);
4787 * @deprecated unused
4789 attribute_deprecated
4790 void avpicture_free(AVPicture *picture);
4793 * @deprecated use av_image_fill_arrays() instead.
4795 attribute_deprecated
4796 int avpicture_fill(AVPicture *picture, const uint8_t *ptr,
4797 enum AVPixelFormat pix_fmt, int width, int height);
4800 * @deprecated use av_image_copy_to_buffer() instead.
4802 attribute_deprecated
4803 int avpicture_layout(const AVPicture *src, enum AVPixelFormat pix_fmt,
4804 int width, int height,
4805 unsigned char *dest, int dest_size);
4808 * @deprecated use av_image_get_buffer_size() instead.
4810 attribute_deprecated
4811 int avpicture_get_size(enum AVPixelFormat pix_fmt, int width, int height);
4814 * @deprecated av_image_copy() instead.
4816 attribute_deprecated
4817 void av_picture_copy(AVPicture *dst, const AVPicture *src,
4818 enum AVPixelFormat pix_fmt, int width, int height);
4821 * @deprecated unused
4823 attribute_deprecated
4824 int av_picture_crop(AVPicture *dst, const AVPicture *src,
4825 enum AVPixelFormat pix_fmt, int top_band, int left_band);
4828 * @deprecated unused
4830 attribute_deprecated
4831 int av_picture_pad(AVPicture *dst, const AVPicture *src, int height, int width, enum AVPixelFormat pix_fmt,
4832 int padtop, int padbottom, int padleft, int padright, int *color);
4840 * @defgroup lavc_misc Utility functions
4843 * Miscellaneous utility functions related to both encoding and decoding
4849 * @defgroup lavc_misc_pixfmt Pixel formats
4851 * Functions for working with pixel formats.
4856 * Utility function to access log2_chroma_w log2_chroma_h from
4857 * the pixel format AVPixFmtDescriptor.
4859 * This function asserts that pix_fmt is valid. See av_pix_fmt_get_chroma_sub_sample
4860 * for one that returns a failure code and continues in case of invalid
4863 * @param[in] pix_fmt the pixel format
4864 * @param[out] h_shift store log2_chroma_w
4865 * @param[out] v_shift store log2_chroma_h
4867 * @see av_pix_fmt_get_chroma_sub_sample
4870 void avcodec_get_chroma_sub_sample(enum AVPixelFormat pix_fmt, int *h_shift, int *v_shift);
4873 * Return a value representing the fourCC code associated to the
4874 * pixel format pix_fmt, or 0 if no associated fourCC code can be
4877 unsigned int avcodec_pix_fmt_to_codec_tag(enum AVPixelFormat pix_fmt);
4880 * @deprecated see av_get_pix_fmt_loss()
4882 int avcodec_get_pix_fmt_loss(enum AVPixelFormat dst_pix_fmt, enum AVPixelFormat src_pix_fmt,
4886 * Find the best pixel format to convert to given a certain source pixel
4887 * format. When converting from one pixel format to another, information loss
4888 * may occur. For example, when converting from RGB24 to GRAY, the color
4889 * information will be lost. Similarly, other losses occur when converting from
4890 * some formats to other formats. avcodec_find_best_pix_fmt_of_2() searches which of
4891 * the given pixel formats should be used to suffer the least amount of loss.
4892 * The pixel formats from which it chooses one, are determined by the
4893 * pix_fmt_list parameter.
4896 * @param[in] pix_fmt_list AV_PIX_FMT_NONE terminated array of pixel formats to choose from
4897 * @param[in] src_pix_fmt source pixel format
4898 * @param[in] has_alpha Whether the source pixel format alpha channel is used.
4899 * @param[out] loss_ptr Combination of flags informing you what kind of losses will occur.
4900 * @return The best pixel format to convert to or -1 if none was found.
4902 enum AVPixelFormat avcodec_find_best_pix_fmt_of_list(const enum AVPixelFormat *pix_fmt_list,
4903 enum AVPixelFormat src_pix_fmt,
4904 int has_alpha, int *loss_ptr);
4907 * @deprecated see av_find_best_pix_fmt_of_2()
4909 enum AVPixelFormat avcodec_find_best_pix_fmt_of_2(enum AVPixelFormat dst_pix_fmt1, enum AVPixelFormat dst_pix_fmt2,
4910 enum AVPixelFormat src_pix_fmt, int has_alpha, int *loss_ptr);
4912 attribute_deprecated
4913 #if AV_HAVE_INCOMPATIBLE_LIBAV_ABI
4914 enum AVPixelFormat avcodec_find_best_pix_fmt2(const enum AVPixelFormat *pix_fmt_list,
4915 enum AVPixelFormat src_pix_fmt,
4916 int has_alpha, int *loss_ptr);
4918 enum AVPixelFormat avcodec_find_best_pix_fmt2(enum AVPixelFormat dst_pix_fmt1, enum AVPixelFormat dst_pix_fmt2,
4919 enum AVPixelFormat src_pix_fmt, int has_alpha, int *loss_ptr);
4923 enum AVPixelFormat avcodec_default_get_format(struct AVCodecContext *s, const enum AVPixelFormat * fmt);
4929 #if FF_API_SET_DIMENSIONS
4931 * @deprecated this function is not supposed to be used from outside of lavc
4933 attribute_deprecated
4934 void avcodec_set_dimensions(AVCodecContext *s, int width, int height);
4938 * Put a string representing the codec tag codec_tag in buf.
4940 * @param buf buffer to place codec tag in
4941 * @param buf_size size in bytes of buf
4942 * @param codec_tag codec tag to assign
4943 * @return the length of the string that would have been generated if
4944 * enough space had been available, excluding the trailing null
4946 size_t av_get_codec_tag_string(char *buf, size_t buf_size, unsigned int codec_tag);
4948 void avcodec_string(char *buf, int buf_size, AVCodecContext *enc, int encode);
4951 * Return a name for the specified profile, if available.
4953 * @param codec the codec that is searched for the given profile
4954 * @param profile the profile value for which a name is requested
4955 * @return A name for the profile if found, NULL otherwise.
4957 const char *av_get_profile_name(const AVCodec *codec, int profile);
4959 int avcodec_default_execute(AVCodecContext *c, int (*func)(AVCodecContext *c2, void *arg2),void *arg, int *ret, int count, int size);
4960 int avcodec_default_execute2(AVCodecContext *c, int (*func)(AVCodecContext *c2, void *arg2, int, int),void *arg, int *ret, int count);
4961 //FIXME func typedef
4964 * Fill AVFrame audio data and linesize pointers.
4966 * The buffer buf must be a preallocated buffer with a size big enough
4967 * to contain the specified samples amount. The filled AVFrame data
4968 * pointers will point to this buffer.
4970 * AVFrame extended_data channel pointers are allocated if necessary for
4973 * @param frame the AVFrame
4974 * frame->nb_samples must be set prior to calling the
4975 * function. This function fills in frame->data,
4976 * frame->extended_data, frame->linesize[0].
4977 * @param nb_channels channel count
4978 * @param sample_fmt sample format
4979 * @param buf buffer to use for frame data
4980 * @param buf_size size of buffer
4981 * @param align plane size sample alignment (0 = default)
4982 * @return >=0 on success, negative error code on failure
4983 * @todo return the size in bytes required to store the samples in
4984 * case of success, at the next libavutil bump
4986 int avcodec_fill_audio_frame(AVFrame *frame, int nb_channels,
4987 enum AVSampleFormat sample_fmt, const uint8_t *buf,
4988 int buf_size, int align);
4991 * Reset the internal decoder state / flush internal buffers. Should be called
4992 * e.g. when seeking or when switching to a different stream.
4994 * @note when refcounted frames are not used (i.e. avctx->refcounted_frames is 0),
4995 * this invalidates the frames previously returned from the decoder. When
4996 * refcounted frames are used, the decoder just releases any references it might
4997 * keep internally, but the caller's reference remains valid.
4999 void avcodec_flush_buffers(AVCodecContext *avctx);
5002 * Return codec bits per sample.
5004 * @param[in] codec_id the codec
5005 * @return Number of bits per sample or zero if unknown for the given codec.
5007 int av_get_bits_per_sample(enum AVCodecID codec_id);
5010 * Return the PCM codec associated with a sample format.
5011 * @param be endianness, 0 for little, 1 for big,
5012 * -1 (or anything else) for native
5013 * @return AV_CODEC_ID_PCM_* or AV_CODEC_ID_NONE
5015 enum AVCodecID av_get_pcm_codec(enum AVSampleFormat fmt, int be);
5018 * Return codec bits per sample.
5019 * Only return non-zero if the bits per sample is exactly correct, not an
5022 * @param[in] codec_id the codec
5023 * @return Number of bits per sample or zero if unknown for the given codec.
5025 int av_get_exact_bits_per_sample(enum AVCodecID codec_id);
5028 * Return audio frame duration.
5030 * @param avctx codec context
5031 * @param frame_bytes size of the frame, or 0 if unknown
5032 * @return frame duration, in samples, if known. 0 if not able to
5035 int av_get_audio_frame_duration(AVCodecContext *avctx, int frame_bytes);
5038 typedef struct AVBitStreamFilterContext {
5040 struct AVBitStreamFilter *filter;
5041 AVCodecParserContext *parser;
5042 struct AVBitStreamFilterContext *next;
5044 * Internal default arguments, used if NULL is passed to av_bitstream_filter_filter().
5045 * Not for access by library users.
5048 } AVBitStreamFilterContext;
5051 typedef struct AVBitStreamFilter {
5054 int (*filter)(AVBitStreamFilterContext *bsfc,
5055 AVCodecContext *avctx, const char *args,
5056 uint8_t **poutbuf, int *poutbuf_size,
5057 const uint8_t *buf, int buf_size, int keyframe);
5058 void (*close)(AVBitStreamFilterContext *bsfc);
5059 struct AVBitStreamFilter *next;
5060 } AVBitStreamFilter;
5063 * Register a bitstream filter.
5065 * The filter will be accessible to the application code through
5066 * av_bitstream_filter_next() or can be directly initialized with
5067 * av_bitstream_filter_init().
5069 * @see avcodec_register_all()
5071 void av_register_bitstream_filter(AVBitStreamFilter *bsf);
5074 * Create and initialize a bitstream filter context given a bitstream
5077 * The returned context must be freed with av_bitstream_filter_close().
5079 * @param name the name of the bitstream filter
5080 * @return a bitstream filter context if a matching filter was found
5081 * and successfully initialized, NULL otherwise
5083 AVBitStreamFilterContext *av_bitstream_filter_init(const char *name);
5088 * This function filters the buffer buf with size buf_size, and places the
5089 * filtered buffer in the buffer pointed to by poutbuf.
5091 * The output buffer must be freed by the caller.
5093 * @param bsfc bitstream filter context created by av_bitstream_filter_init()
5094 * @param avctx AVCodecContext accessed by the filter, may be NULL.
5095 * If specified, this must point to the encoder context of the
5096 * output stream the packet is sent to.
5097 * @param args arguments which specify the filter configuration, may be NULL
5098 * @param poutbuf pointer which is updated to point to the filtered buffer
5099 * @param poutbuf_size pointer which is updated to the filtered buffer size in bytes
5100 * @param buf buffer containing the data to filter
5101 * @param buf_size size in bytes of buf
5102 * @param keyframe set to non-zero if the buffer to filter corresponds to a key-frame packet data
5103 * @return >= 0 in case of success, or a negative error code in case of failure
5105 * If the return value is positive, an output buffer is allocated and
5106 * is available in *poutbuf, and is distinct from the input buffer.
5108 * If the return value is 0, the output buffer is not allocated and
5109 * should be considered identical to the input buffer, or in case
5110 * *poutbuf was set it points to the input buffer (not necessarily to
5111 * its starting address).
5113 int av_bitstream_filter_filter(AVBitStreamFilterContext *bsfc,
5114 AVCodecContext *avctx, const char *args,
5115 uint8_t **poutbuf, int *poutbuf_size,
5116 const uint8_t *buf, int buf_size, int keyframe);
5119 * Release bitstream filter context.
5121 * @param bsf the bitstream filter context created with
5122 * av_bitstream_filter_init(), can be NULL
5124 void av_bitstream_filter_close(AVBitStreamFilterContext *bsf);
5127 * If f is NULL, return the first registered bitstream filter,
5128 * if f is non-NULL, return the next registered bitstream filter
5129 * after f, or NULL if f is the last one.
5131 * This function can be used to iterate over all registered bitstream
5134 AVBitStreamFilter *av_bitstream_filter_next(const AVBitStreamFilter *f);
5139 * Same behaviour av_fast_malloc but the buffer has additional
5140 * AV_INPUT_BUFFER_PADDING_SIZE at the end which will always be 0.
5142 * In addition the whole buffer will initially and after resizes
5143 * be 0-initialized so that no uninitialized data will ever appear.
5145 void av_fast_padded_malloc(void *ptr, unsigned int *size, size_t min_size);
5148 * Same behaviour av_fast_padded_malloc except that buffer will always
5149 * be 0-initialized after call.
5151 void av_fast_padded_mallocz(void *ptr, unsigned int *size, size_t min_size);
5154 * Encode extradata length to a buffer. Used by xiph codecs.
5156 * @param s buffer to write to; must be at least (v/255+1) bytes long
5157 * @param v size of extradata in bytes
5158 * @return number of bytes written to the buffer.
5160 unsigned int av_xiphlacing(unsigned char *s, unsigned int v);
5162 #if FF_API_MISSING_SAMPLE
5164 * Log a generic warning message about a missing feature. This function is
5165 * intended to be used internally by FFmpeg (libavcodec, libavformat, etc.)
5166 * only, and would normally not be used by applications.
5167 * @param[in] avc a pointer to an arbitrary struct of which the first field is
5168 * a pointer to an AVClass struct
5169 * @param[in] feature string containing the name of the missing feature
5170 * @param[in] want_sample indicates if samples are wanted which exhibit this feature.
5171 * If want_sample is non-zero, additional verbage will be added to the log
5172 * message which tells the user how to report samples to the development
5174 * @deprecated Use avpriv_report_missing_feature() instead.
5176 attribute_deprecated
5177 void av_log_missing_feature(void *avc, const char *feature, int want_sample);
5180 * Log a generic warning message asking for a sample. This function is
5181 * intended to be used internally by FFmpeg (libavcodec, libavformat, etc.)
5182 * only, and would normally not be used by applications.
5183 * @param[in] avc a pointer to an arbitrary struct of which the first field is
5184 * a pointer to an AVClass struct
5185 * @param[in] msg string containing an optional message, or NULL if no message
5186 * @deprecated Use avpriv_request_sample() instead.
5188 attribute_deprecated
5189 void av_log_ask_for_sample(void *avc, const char *msg, ...) av_printf_format(2, 3);
5190 #endif /* FF_API_MISSING_SAMPLE */
5193 * Register the hardware accelerator hwaccel.
5195 void av_register_hwaccel(AVHWAccel *hwaccel);
5198 * If hwaccel is NULL, returns the first registered hardware accelerator,
5199 * if hwaccel is non-NULL, returns the next registered hardware accelerator
5200 * after hwaccel, or NULL if hwaccel is the last one.
5202 AVHWAccel *av_hwaccel_next(const AVHWAccel *hwaccel);
5206 * Lock operation used by lockmgr
5209 AV_LOCK_CREATE, ///< Create a mutex
5210 AV_LOCK_OBTAIN, ///< Lock the mutex
5211 AV_LOCK_RELEASE, ///< Unlock the mutex
5212 AV_LOCK_DESTROY, ///< Free mutex resources
5216 * Register a user provided lock manager supporting the operations
5217 * specified by AVLockOp. The "mutex" argument to the function points
5218 * to a (void *) where the lockmgr should store/get a pointer to a user
5219 * allocated mutex. It is NULL upon AV_LOCK_CREATE and equal to the
5220 * value left by the last call for all other ops. If the lock manager is
5221 * unable to perform the op then it should leave the mutex in the same
5222 * state as when it was called and return a non-zero value. However,
5223 * when called with AV_LOCK_DESTROY the mutex will always be assumed to
5224 * have been successfully destroyed. If av_lockmgr_register succeeds
5225 * it will return a non-negative value, if it fails it will return a
5226 * negative value and destroy all mutex and unregister all callbacks.
5227 * av_lockmgr_register is not thread-safe, it must be called from a
5228 * single thread before any calls which make use of locking are used.
5230 * @param cb User defined callback. av_lockmgr_register invokes calls
5231 * to this callback and the previously registered callback.
5232 * The callback will be used to create more than one mutex
5233 * each of which must be backed by its own underlying locking
5234 * mechanism (i.e. do not use a single static object to
5235 * implement your lock manager). If cb is set to NULL the
5236 * lockmgr will be unregistered.
5238 int av_lockmgr_register(int (*cb)(void **mutex, enum AVLockOp op));
5241 * Get the type of the given codec.
5243 enum AVMediaType avcodec_get_type(enum AVCodecID codec_id);
5246 * Get the name of a codec.
5247 * @return a static string identifying the codec; never NULL
5249 const char *avcodec_get_name(enum AVCodecID id);
5252 * @return a positive value if s is open (i.e. avcodec_open2() was called on it
5253 * with no corresponding avcodec_close()), 0 otherwise.
5255 int avcodec_is_open(AVCodecContext *s);
5258 * @return a non-zero number if codec is an encoder, zero otherwise
5260 int av_codec_is_encoder(const AVCodec *codec);
5263 * @return a non-zero number if codec is a decoder, zero otherwise
5265 int av_codec_is_decoder(const AVCodec *codec);
5268 * @return descriptor for given codec ID or NULL if no descriptor exists.
5270 const AVCodecDescriptor *avcodec_descriptor_get(enum AVCodecID id);
5273 * Iterate over all codec descriptors known to libavcodec.
5275 * @param prev previous descriptor. NULL to get the first descriptor.
5277 * @return next descriptor or NULL after the last descriptor
5279 const AVCodecDescriptor *avcodec_descriptor_next(const AVCodecDescriptor *prev);
5282 * @return codec descriptor with the given name or NULL if no such descriptor
5285 const AVCodecDescriptor *avcodec_descriptor_get_by_name(const char *name);
5291 #endif /* AVCODEC_AVCODEC_H */