2 * copyright (c) 2001 Fabrice Bellard
4 * This file is part of Libav.
6 * Libav is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
11 * Libav is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with Libav; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21 #ifndef AVCODEC_AVCODEC_H
22 #define AVCODEC_AVCODEC_H
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/dict.h"
37 #include "libavutil/frame.h"
38 #include "libavutil/log.h"
39 #include "libavutil/pixfmt.h"
40 #include "libavutil/rational.h"
44 #if FF_API_FAST_MALLOC
45 // to provide fast_*alloc
46 #include "libavutil/mem.h"
50 * @defgroup libavc Encoding/Decoding Library
53 * @defgroup lavc_decoding Decoding
57 * @defgroup lavc_encoding Encoding
61 * @defgroup lavc_codec Codecs
63 * @defgroup lavc_codec_native Native Codecs
66 * @defgroup lavc_codec_wrappers External library wrappers
69 * @defgroup lavc_codec_hwaccel Hardware Accelerators bridge
73 * @defgroup lavc_internal Internal
81 * @defgroup lavc_core Core functions/structures.
84 * Basic definitions, functions for querying libavcodec capabilities,
85 * allocating core structures, etc.
91 * Identify the syntax and semantics of the bitstream.
92 * The principle is roughly:
93 * Two decoders with the same ID can decode the same streams.
94 * Two encoders with the same ID can encode compatible streams.
95 * There may be slight deviations from the principle due to implementation
98 * If you add a codec ID to this list, add it so that
99 * 1. no value of a existing codec ID changes (that would break ABI),
100 * 2. it is as close as possible to similar codecs.
102 * After adding new codec IDs, do not forget to add an entry to the codec
103 * descriptor list and bump libavcodec minor version.
109 AV_CODEC_ID_MPEG1VIDEO,
110 AV_CODEC_ID_MPEG2VIDEO, ///< preferred ID for MPEG-1/2 video decoding
112 AV_CODEC_ID_MPEG2VIDEO_XVMC,
113 #endif /* FF_API_XVMC */
124 AV_CODEC_ID_RAWVIDEO,
125 AV_CODEC_ID_MSMPEG4V1,
126 AV_CODEC_ID_MSMPEG4V2,
127 AV_CODEC_ID_MSMPEG4V3,
150 AV_CODEC_ID_INTERPLAY_VIDEO,
157 AV_CODEC_ID_MSVIDEO1,
162 AV_CODEC_ID_TRUEMOTION1,
163 AV_CODEC_ID_VMDVIDEO,
188 AV_CODEC_ID_TRUEMOTION2,
194 AV_CODEC_ID_SMACKVIDEO,
199 AV_CODEC_ID_JPEG2000,
205 AV_CODEC_ID_DSICINVIDEO,
206 AV_CODEC_ID_TIERTEXSEQVIDEO,
214 AV_CODEC_ID_BETHSOFTVID,
226 AV_CODEC_ID_ESCAPE124,
230 AV_CODEC_ID_MOTIONPIXELS,
242 AV_CODEC_ID_FLASHSV2,
243 AV_CODEC_ID_CDGRAPHICS,
246 AV_CODEC_ID_BINKVIDEO,
247 AV_CODEC_ID_IFF_ILBM,
248 AV_CODEC_ID_IFF_BYTERUN1,
254 AV_CODEC_ID_A64_MULTI,
255 AV_CODEC_ID_A64_MULTI5,
258 AV_CODEC_ID_LAGARITH,
262 AV_CODEC_ID_WMV3IMAGE,
263 AV_CODEC_ID_VC1IMAGE,
265 AV_CODEC_ID_BMV_VIDEO,
272 AV_CODEC_ID_ZEROCODEC,
281 AV_CODEC_ID_ESCAPE130,
284 AV_CODEC_ID_HNM4_VIDEO,
288 /* various PCM "codecs" */
289 AV_CODEC_ID_FIRST_AUDIO = 0x10000, ///< A dummy id pointing at the start of audio codecs
290 AV_CODEC_ID_PCM_S16LE = 0x10000,
291 AV_CODEC_ID_PCM_S16BE,
292 AV_CODEC_ID_PCM_U16LE,
293 AV_CODEC_ID_PCM_U16BE,
296 AV_CODEC_ID_PCM_MULAW,
297 AV_CODEC_ID_PCM_ALAW,
298 AV_CODEC_ID_PCM_S32LE,
299 AV_CODEC_ID_PCM_S32BE,
300 AV_CODEC_ID_PCM_U32LE,
301 AV_CODEC_ID_PCM_U32BE,
302 AV_CODEC_ID_PCM_S24LE,
303 AV_CODEC_ID_PCM_S24BE,
304 AV_CODEC_ID_PCM_U24LE,
305 AV_CODEC_ID_PCM_U24BE,
306 AV_CODEC_ID_PCM_S24DAUD,
307 AV_CODEC_ID_PCM_ZORK,
308 AV_CODEC_ID_PCM_S16LE_PLANAR,
310 AV_CODEC_ID_PCM_F32BE,
311 AV_CODEC_ID_PCM_F32LE,
312 AV_CODEC_ID_PCM_F64BE,
313 AV_CODEC_ID_PCM_F64LE,
314 AV_CODEC_ID_PCM_BLURAY,
317 AV_CODEC_ID_PCM_S8_PLANAR,
318 AV_CODEC_ID_PCM_S24LE_PLANAR,
319 AV_CODEC_ID_PCM_S32LE_PLANAR,
321 /* various ADPCM codecs */
322 AV_CODEC_ID_ADPCM_IMA_QT = 0x11000,
323 AV_CODEC_ID_ADPCM_IMA_WAV,
324 AV_CODEC_ID_ADPCM_IMA_DK3,
325 AV_CODEC_ID_ADPCM_IMA_DK4,
326 AV_CODEC_ID_ADPCM_IMA_WS,
327 AV_CODEC_ID_ADPCM_IMA_SMJPEG,
328 AV_CODEC_ID_ADPCM_MS,
329 AV_CODEC_ID_ADPCM_4XM,
330 AV_CODEC_ID_ADPCM_XA,
331 AV_CODEC_ID_ADPCM_ADX,
332 AV_CODEC_ID_ADPCM_EA,
333 AV_CODEC_ID_ADPCM_G726,
334 AV_CODEC_ID_ADPCM_CT,
335 AV_CODEC_ID_ADPCM_SWF,
336 AV_CODEC_ID_ADPCM_YAMAHA,
337 AV_CODEC_ID_ADPCM_SBPRO_4,
338 AV_CODEC_ID_ADPCM_SBPRO_3,
339 AV_CODEC_ID_ADPCM_SBPRO_2,
340 AV_CODEC_ID_ADPCM_THP,
341 AV_CODEC_ID_ADPCM_IMA_AMV,
342 AV_CODEC_ID_ADPCM_EA_R1,
343 AV_CODEC_ID_ADPCM_EA_R3,
344 AV_CODEC_ID_ADPCM_EA_R2,
345 AV_CODEC_ID_ADPCM_IMA_EA_SEAD,
346 AV_CODEC_ID_ADPCM_IMA_EA_EACS,
347 AV_CODEC_ID_ADPCM_EA_XAS,
348 AV_CODEC_ID_ADPCM_EA_MAXIS_XA,
349 AV_CODEC_ID_ADPCM_IMA_ISS,
350 AV_CODEC_ID_ADPCM_G722,
351 AV_CODEC_ID_ADPCM_IMA_APC,
354 AV_CODEC_ID_AMR_NB = 0x12000,
357 /* RealAudio codecs*/
358 AV_CODEC_ID_RA_144 = 0x13000,
361 /* various DPCM codecs */
362 AV_CODEC_ID_ROQ_DPCM = 0x14000,
363 AV_CODEC_ID_INTERPLAY_DPCM,
364 AV_CODEC_ID_XAN_DPCM,
365 AV_CODEC_ID_SOL_DPCM,
368 AV_CODEC_ID_MP2 = 0x15000,
369 AV_CODEC_ID_MP3, ///< preferred ID for decoding MPEG audio layer 1, 2 or 3
379 AV_CODEC_ID_VMDAUDIO,
385 AV_CODEC_ID_WESTWOOD_SND1,
386 AV_CODEC_ID_GSM, ///< as in Berlin toast format
389 AV_CODEC_ID_TRUESPEECH,
391 AV_CODEC_ID_SMACKAUDIO,
394 AV_CODEC_ID_DSICINAUDIO,
396 AV_CODEC_ID_MUSEPACK7,
398 AV_CODEC_ID_GSM_MS, /* as found in WAV */
404 AV_CODEC_ID_NELLYMOSER,
405 AV_CODEC_ID_MUSEPACK8,
407 AV_CODEC_ID_WMAVOICE,
409 AV_CODEC_ID_WMALOSSLESS,
418 AV_CODEC_ID_BINKAUDIO_RDFT,
419 AV_CODEC_ID_BINKAUDIO_DCT,
420 AV_CODEC_ID_AAC_LATM,
425 AV_CODEC_ID_8SVX_EXP,
426 AV_CODEC_ID_8SVX_FIB,
427 AV_CODEC_ID_BMV_AUDIO,
432 AV_CODEC_ID_COMFORT_NOISE,
434 AV_CODEC_ID_METASOUND,
436 /* subtitle codecs */
437 AV_CODEC_ID_FIRST_SUBTITLE = 0x17000, ///< A dummy ID pointing at the start of subtitle codecs.
438 AV_CODEC_ID_DVD_SUBTITLE = 0x17000,
439 AV_CODEC_ID_DVB_SUBTITLE,
440 AV_CODEC_ID_TEXT, ///< raw UTF-8 text
443 AV_CODEC_ID_MOV_TEXT,
444 AV_CODEC_ID_HDMV_PGS_SUBTITLE,
445 AV_CODEC_ID_DVB_TELETEXT,
448 /* other specific kind of codecs (generally used for attachments) */
449 AV_CODEC_ID_FIRST_UNKNOWN = 0x18000, ///< A dummy ID pointing at the start of various fake codecs.
450 AV_CODEC_ID_TTF = 0x18000,
452 AV_CODEC_ID_PROBE = 0x19000, ///< codec_id is not known (like AV_CODEC_ID_NONE) but lavf should attempt to identify it
454 AV_CODEC_ID_MPEG2TS = 0x20000, /**< _FAKE_ codec to indicate a raw MPEG-2 TS
455 * stream (only used by libavformat) */
456 AV_CODEC_ID_MPEG4SYSTEMS = 0x20001, /**< _FAKE_ codec to indicate a MPEG-4 Systems
457 * stream (only used by libavformat) */
458 AV_CODEC_ID_FFMETADATA = 0x21000, ///< Dummy codec for streams containing only metadata information.
462 * This struct describes the properties of a single codec described by an
464 * @see avcodec_get_descriptor()
466 typedef struct AVCodecDescriptor {
468 enum AVMediaType type;
470 * Name of the codec described by this descriptor. It is non-empty and
471 * unique for each codec descriptor. It should contain alphanumeric
472 * characters and '_' only.
476 * A more descriptive name for this codec. May be NULL.
478 const char *long_name;
480 * Codec properties, a combination of AV_CODEC_PROP_* flags.
486 * Codec uses only intra compression.
489 #define AV_CODEC_PROP_INTRA_ONLY (1 << 0)
491 * Codec supports lossy compression. Audio and video codecs only.
492 * @note a codec may support both lossy and lossless
495 #define AV_CODEC_PROP_LOSSY (1 << 1)
497 * Codec supports lossless compression. Audio and video codecs only.
499 #define AV_CODEC_PROP_LOSSLESS (1 << 2)
502 * @ingroup lavc_decoding
503 * Required number of additionally allocated bytes at the end of the input bitstream for decoding.
504 * This is mainly needed because some optimized bitstream readers read
505 * 32 or 64 bit at once and could read over the end.<br>
506 * Note: If the first 23 bits of the additional bytes are not 0, then damaged
507 * MPEG bitstreams could cause overread and segfault.
509 #define FF_INPUT_BUFFER_PADDING_SIZE 8
512 * @ingroup lavc_encoding
513 * minimum encoding buffer size
514 * Used to avoid some checks during header writing.
516 #define FF_MIN_BUFFER_SIZE 16384
520 * @ingroup lavc_encoding
521 * motion estimation type.
524 ME_ZERO = 1, ///< no search, that is use 0,0 vector whenever one is needed
528 ME_EPZS, ///< enhanced predictive zonal search
529 ME_X1, ///< reserved for experiments
530 ME_HEX, ///< hexagon based search
531 ME_UMH, ///< uneven multi-hexagon search
532 ME_TESA, ///< transformed exhaustive search algorithm
536 * @ingroup lavc_decoding
539 /* We leave some space between them for extensions (drop some
540 * keyframes for intra-only or drop just some bidir frames). */
541 AVDISCARD_NONE =-16, ///< discard nothing
542 AVDISCARD_DEFAULT = 0, ///< discard useless packets like 0 size packets in avi
543 AVDISCARD_NONREF = 8, ///< discard all non reference
544 AVDISCARD_BIDIR = 16, ///< discard all bidirectional frames
545 AVDISCARD_NONKEY = 32, ///< discard all frames except keyframes
546 AVDISCARD_ALL = 48, ///< discard all
549 enum AVColorPrimaries{
550 AVCOL_PRI_BT709 = 1, ///< also ITU-R BT1361 / IEC 61966-2-4 / SMPTE RP177 Annex B
551 AVCOL_PRI_UNSPECIFIED = 2,
552 AVCOL_PRI_BT470M = 4,
553 AVCOL_PRI_BT470BG = 5, ///< also ITU-R BT601-6 625 / ITU-R BT1358 625 / ITU-R BT1700 625 PAL & SECAM
554 AVCOL_PRI_SMPTE170M = 6, ///< also ITU-R BT601-6 525 / ITU-R BT1358 525 / ITU-R BT1700 NTSC
555 AVCOL_PRI_SMPTE240M = 7, ///< functionally identical to above
557 AVCOL_PRI_BT2020 = 9, ///< ITU-R BT2020
558 AVCOL_PRI_NB , ///< Not part of ABI
561 enum AVColorTransferCharacteristic{
562 AVCOL_TRC_BT709 = 1, ///< also ITU-R BT1361
563 AVCOL_TRC_UNSPECIFIED = 2,
564 AVCOL_TRC_GAMMA22 = 4, ///< also ITU-R BT470M / ITU-R BT1700 625 PAL & SECAM
565 AVCOL_TRC_GAMMA28 = 5, ///< also ITU-R BT470BG
566 AVCOL_TRC_SMPTE170M = 6, ///< also ITU-R BT601-6 525 or 625 / ITU-R BT1358 525 or 625 / ITU-R BT1700 NTSC
567 AVCOL_TRC_SMPTE240M = 7,
568 AVCOL_TRC_LINEAR = 8, ///< "Linear transfer characteristics"
569 AVCOL_TRC_LOG = 9, ///< "Logarithmic transfer characteristic (100:1 range)"
570 AVCOL_TRC_LOG_SQRT = 10, ///< "Logarithmic transfer characteristic (100 * Sqrt( 10 ) : 1 range)"
571 AVCOL_TRC_IEC61966_2_4 = 11, ///< IEC 61966-2-4
572 AVCOL_TRC_BT1361_ECG = 12, ///< ITU-R BT1361 Extended Colour Gamut
573 AVCOL_TRC_IEC61966_2_1 = 13, ///< IEC 61966-2-1 (sRGB or sYCC)
574 AVCOL_TRC_BT2020_10 = 14, ///< ITU-R BT2020 for 10 bit system
575 AVCOL_TRC_BT2020_12 = 15, ///< ITU-R BT2020 for 12 bit system
576 AVCOL_TRC_NB , ///< Not part of ABI
581 AVCOL_SPC_BT709 = 1, ///< also ITU-R BT1361 / IEC 61966-2-4 xvYCC709 / SMPTE RP177 Annex B
582 AVCOL_SPC_UNSPECIFIED = 2,
584 AVCOL_SPC_BT470BG = 5, ///< also ITU-R BT601-6 625 / ITU-R BT1358 625 / ITU-R BT1700 625 PAL & SECAM / IEC 61966-2-4 xvYCC601
585 AVCOL_SPC_SMPTE170M = 6, ///< also ITU-R BT601-6 525 / ITU-R BT1358 525 / ITU-R BT1700 NTSC / functionally identical to above
586 AVCOL_SPC_SMPTE240M = 7,
587 AVCOL_SPC_YCOCG = 8, ///< Used by Dirac / VC-2 and H.264 FRext, see ITU-T SG16
588 AVCOL_SPC_BT2020_NCL = 9, ///< ITU-R BT2020 non-constant luminance system
589 AVCOL_SPC_BT2020_CL = 10, ///< ITU-R BT2020 constant luminance system
590 AVCOL_SPC_NB , ///< Not part of ABI
594 AVCOL_RANGE_UNSPECIFIED = 0,
595 AVCOL_RANGE_MPEG = 1, ///< the normal 219*2^(n-8) "MPEG" YUV ranges
596 AVCOL_RANGE_JPEG = 2, ///< the normal 2^n-1 "JPEG" YUV ranges
597 AVCOL_RANGE_NB , ///< Not part of ABI
601 * X X 3 4 X X are luma samples,
602 * 1 2 1-6 are possible chroma positions
603 * X X 5 6 X 0 is undefined/unknown position
605 enum AVChromaLocation{
606 AVCHROMA_LOC_UNSPECIFIED = 0,
607 AVCHROMA_LOC_LEFT = 1, ///< mpeg2/4, h264 default
608 AVCHROMA_LOC_CENTER = 2, ///< mpeg1, jpeg, h263
609 AVCHROMA_LOC_TOPLEFT = 3, ///< DV
610 AVCHROMA_LOC_TOP = 4,
611 AVCHROMA_LOC_BOTTOMLEFT = 5,
612 AVCHROMA_LOC_BOTTOM = 6,
613 AVCHROMA_LOC_NB , ///< Not part of ABI
616 enum AVAudioServiceType {
617 AV_AUDIO_SERVICE_TYPE_MAIN = 0,
618 AV_AUDIO_SERVICE_TYPE_EFFECTS = 1,
619 AV_AUDIO_SERVICE_TYPE_VISUALLY_IMPAIRED = 2,
620 AV_AUDIO_SERVICE_TYPE_HEARING_IMPAIRED = 3,
621 AV_AUDIO_SERVICE_TYPE_DIALOGUE = 4,
622 AV_AUDIO_SERVICE_TYPE_COMMENTARY = 5,
623 AV_AUDIO_SERVICE_TYPE_EMERGENCY = 6,
624 AV_AUDIO_SERVICE_TYPE_VOICE_OVER = 7,
625 AV_AUDIO_SERVICE_TYPE_KARAOKE = 8,
626 AV_AUDIO_SERVICE_TYPE_NB , ///< Not part of ABI
630 * @ingroup lavc_encoding
632 typedef struct RcOverride{
635 int qscale; // If this is 0 then quality_factor will be used instead.
636 float quality_factor;
639 #if FF_API_MAX_BFRAMES
641 * @deprecated there is no libavcodec-wide limit on the number of B-frames
643 #define FF_MAX_B_FRAMES 16
647 These flags can be passed in AVCodecContext.flags before initialization.
648 Note: Not everything is supported yet.
652 * Allow decoders to produce frames with data planes that are not aligned
653 * to CPU requirements (e.g. due to cropping).
655 #define CODEC_FLAG_UNALIGNED 0x0001
656 #define CODEC_FLAG_QSCALE 0x0002 ///< Use fixed qscale.
657 #define CODEC_FLAG_4MV 0x0004 ///< 4 MV per MB allowed / advanced prediction for H.263.
658 #define CODEC_FLAG_OUTPUT_CORRUPT 0x0008 ///< Output even those frames that might be corrupted
659 #define CODEC_FLAG_QPEL 0x0010 ///< Use qpel MC.
660 #define CODEC_FLAG_GMC 0x0020 ///< Use GMC.
661 #define CODEC_FLAG_MV0 0x0040 ///< Always try a MB with MV=<0,0>.
663 * The parent program guarantees that the input for B-frames containing
664 * streams is not written to for at least s->max_b_frames+1 frames, if
665 * this is not set the input will be copied.
667 #define CODEC_FLAG_INPUT_PRESERVED 0x0100
668 #define CODEC_FLAG_PASS1 0x0200 ///< Use internal 2pass ratecontrol in first pass mode.
669 #define CODEC_FLAG_PASS2 0x0400 ///< Use internal 2pass ratecontrol in second pass mode.
670 #define CODEC_FLAG_GRAY 0x2000 ///< Only decode/encode grayscale.
673 * @deprecated edges are not used/required anymore. I.e. this flag is now always
676 #define CODEC_FLAG_EMU_EDGE 0x4000
678 #define CODEC_FLAG_PSNR 0x8000 ///< error[?] variables will be set during encoding.
679 #define CODEC_FLAG_TRUNCATED 0x00010000 /** Input bitstream might be truncated at a random
680 location instead of only at frame boundaries. */
681 #define CODEC_FLAG_NORMALIZE_AQP 0x00020000 ///< Normalize adaptive quantization.
682 #define CODEC_FLAG_INTERLACED_DCT 0x00040000 ///< Use interlaced DCT.
683 #define CODEC_FLAG_LOW_DELAY 0x00080000 ///< Force low delay.
684 #define CODEC_FLAG_GLOBAL_HEADER 0x00400000 ///< Place global headers in extradata instead of every keyframe.
685 #define CODEC_FLAG_BITEXACT 0x00800000 ///< Use only bitexact stuff (except (I)DCT).
686 /* Fx : Flag for h263+ extra options */
687 #define CODEC_FLAG_AC_PRED 0x01000000 ///< H.263 advanced intra coding / MPEG-4 AC prediction
688 #define CODEC_FLAG_LOOP_FILTER 0x00000800 ///< loop filter
689 #define CODEC_FLAG_INTERLACED_ME 0x20000000 ///< interlaced motion estimation
690 #define CODEC_FLAG_CLOSED_GOP 0x80000000
691 #define CODEC_FLAG2_FAST 0x00000001 ///< Allow non spec compliant speedup tricks.
692 #define CODEC_FLAG2_NO_OUTPUT 0x00000004 ///< Skip bitstream encoding.
693 #define CODEC_FLAG2_LOCAL_HEADER 0x00000008 ///< Place global headers at every keyframe instead of in extradata.
694 #define CODEC_FLAG2_IGNORE_CROP 0x00010000 ///< Discard cropping information from SPS.
696 #define CODEC_FLAG2_CHUNKS 0x00008000 ///< Input bitstream might be truncated at a packet boundaries instead of only at frame boundaries.
698 /* Unsupported options :
699 * Syntax Arithmetic coding (SAC)
700 * Reference Picture Selection
701 * Independent Segment Decoding */
703 /* codec capabilities */
705 #define CODEC_CAP_DRAW_HORIZ_BAND 0x0001 ///< Decoder can use draw_horiz_band callback.
707 * Codec uses get_buffer() for allocating buffers and supports custom allocators.
708 * If not set, it might not use get_buffer() at all or use operations that
709 * assume the buffer was allocated by avcodec_default_get_buffer.
711 #define CODEC_CAP_DR1 0x0002
712 #define CODEC_CAP_TRUNCATED 0x0008
714 /* Codec can export data for HW decoding (XvMC). */
715 #define CODEC_CAP_HWACCEL 0x0010
716 #endif /* FF_API_XVMC */
718 * Encoder or decoder requires flushing with NULL input at the end in order to
719 * give the complete and correct output.
721 * NOTE: If this flag is not set, the codec is guaranteed to never be fed with
722 * with NULL data. The user can still send NULL data to the public encode
723 * or decode function, but libavcodec will not pass it along to the codec
724 * unless this flag is set.
727 * The decoder has a non-zero delay and needs to be fed with avpkt->data=NULL,
728 * avpkt->size=0 at the end to get the delayed data until the decoder no longer
732 * The encoder needs to be fed with NULL data at the end of encoding until the
733 * encoder no longer returns data.
735 * NOTE: For encoders implementing the AVCodec.encode2() function, setting this
736 * flag also means that the encoder must set the pts and duration for
737 * each output packet. If this flag is not set, the pts and duration will
738 * be determined by libavcodec from the input frame.
740 #define CODEC_CAP_DELAY 0x0020
742 * Codec can be fed a final frame with a smaller size.
743 * This can be used to prevent truncation of the last audio samples.
745 #define CODEC_CAP_SMALL_LAST_FRAME 0x0040
748 * Codec can export data for HW decoding (VDPAU).
750 #define CODEC_CAP_HWACCEL_VDPAU 0x0080
753 * Codec can output multiple frames per AVPacket
754 * Normally demuxers return one frame at a time, demuxers which do not do
755 * are connected to a parser to split what they return into proper frames.
756 * This flag is reserved to the very rare category of codecs which have a
757 * bitstream that cannot be split into frames without timeconsuming
758 * operations like full decoding. Demuxers carring such bitstreams thus
759 * may return multiple frames in a packet. This has many disadvantages like
760 * prohibiting stream copy in many cases thus it should only be considered
763 #define CODEC_CAP_SUBFRAMES 0x0100
765 * Codec is experimental and is thus avoided in favor of non experimental
768 #define CODEC_CAP_EXPERIMENTAL 0x0200
770 * Codec should fill in channel configuration and samplerate instead of container
772 #define CODEC_CAP_CHANNEL_CONF 0x0400
773 #if FF_API_NEG_LINESIZES
775 * @deprecated no codecs use this capability
777 #define CODEC_CAP_NEG_LINESIZES 0x0800
780 * Codec supports frame-level multithreading.
782 #define CODEC_CAP_FRAME_THREADS 0x1000
784 * Codec supports slice-based (or partition-based) multithreading.
786 #define CODEC_CAP_SLICE_THREADS 0x2000
788 * Codec supports changed parameters at any point.
790 #define CODEC_CAP_PARAM_CHANGE 0x4000
792 * Codec supports avctx->thread_count == 0 (auto).
794 #define CODEC_CAP_AUTO_THREADS 0x8000
796 * Audio encoder supports receiving a different number of samples in each call.
798 #define CODEC_CAP_VARIABLE_FRAME_SIZE 0x10000
801 //The following defines may change, don't expect compatibility if you use them.
802 #define MB_TYPE_INTRA4x4 0x0001
803 #define MB_TYPE_INTRA16x16 0x0002 //FIXME H.264-specific
804 #define MB_TYPE_INTRA_PCM 0x0004 //FIXME H.264-specific
805 #define MB_TYPE_16x16 0x0008
806 #define MB_TYPE_16x8 0x0010
807 #define MB_TYPE_8x16 0x0020
808 #define MB_TYPE_8x8 0x0040
809 #define MB_TYPE_INTERLACED 0x0080
810 #define MB_TYPE_DIRECT2 0x0100 //FIXME
811 #define MB_TYPE_ACPRED 0x0200
812 #define MB_TYPE_GMC 0x0400
813 #define MB_TYPE_SKIP 0x0800
814 #define MB_TYPE_P0L0 0x1000
815 #define MB_TYPE_P1L0 0x2000
816 #define MB_TYPE_P0L1 0x4000
817 #define MB_TYPE_P1L1 0x8000
818 #define MB_TYPE_L0 (MB_TYPE_P0L0 | MB_TYPE_P1L0)
819 #define MB_TYPE_L1 (MB_TYPE_P0L1 | MB_TYPE_P1L1)
820 #define MB_TYPE_L0L1 (MB_TYPE_L0 | MB_TYPE_L1)
821 #define MB_TYPE_QUANT 0x00010000
822 #define MB_TYPE_CBP 0x00020000
823 //Note bits 24-31 are reserved for codec specific use (h264 ref0, mpeg1 0mv, ...)
828 * This specifies the area which should be displayed.
829 * Note there may be multiple such areas for one frame.
831 typedef struct AVPanScan{
834 * - encoding: Set by user.
835 * - decoding: Set by libavcodec.
840 * width and height in 1/16 pel
841 * - encoding: Set by user.
842 * - decoding: Set by libavcodec.
848 * position of the top left corner in 1/16 pel for up to 3 fields/frames
849 * - encoding: Set by user.
850 * - decoding: Set by libavcodec.
852 int16_t position[3][2];
855 #if FF_API_QSCALE_TYPE
856 #define FF_QSCALE_TYPE_MPEG1 0
857 #define FF_QSCALE_TYPE_MPEG2 1
858 #define FF_QSCALE_TYPE_H264 2
859 #define FF_QSCALE_TYPE_VP56 3
862 #if FF_API_GET_BUFFER
863 #define FF_BUFFER_TYPE_INTERNAL 1
864 #define FF_BUFFER_TYPE_USER 2 ///< direct rendering buffers (image is (de)allocated by user)
865 #define FF_BUFFER_TYPE_SHARED 4 ///< Buffer from somewhere else; don't deallocate image (data/base), all other tables are not shared.
866 #define FF_BUFFER_TYPE_COPY 8 ///< Just a (modified) copy of some other buffer, don't deallocate anything.
868 #define FF_BUFFER_HINTS_VALID 0x01 // Buffer hints value is meaningful (if 0 ignore).
869 #define FF_BUFFER_HINTS_READABLE 0x02 // Codec will read from buffer.
870 #define FF_BUFFER_HINTS_PRESERVE 0x04 // User must not alter buffer content.
871 #define FF_BUFFER_HINTS_REUSABLE 0x08 // Codec will reuse the buffer (update).
875 * The decoder will keep a reference to the frame and may reuse it later.
877 #define AV_GET_BUFFER_FLAG_REF (1 << 0)
880 * @defgroup lavc_packet AVPacket
882 * Types and functions for working with AVPacket.
885 enum AVPacketSideDataType {
887 AV_PKT_DATA_NEW_EXTRADATA,
890 * An AV_PKT_DATA_PARAM_CHANGE side data packet is laid out as follows:
893 * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_COUNT)
894 * s32le channel_count
895 * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_LAYOUT)
896 * u64le channel_layout
897 * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_SAMPLE_RATE)
899 * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_DIMENSIONS)
904 AV_PKT_DATA_PARAM_CHANGE,
907 * An AV_PKT_DATA_H263_MB_INFO side data packet contains a number of
908 * structures with info about macroblocks relevant to splitting the
909 * packet into smaller packets on macroblock edges (e.g. as for RFC 2190).
910 * That is, it does not necessarily contain info about all macroblocks,
911 * as long as the distance between macroblocks in the info is smaller
912 * than the target payload size.
913 * Each MB info structure is 12 bytes, and is laid out as follows:
915 * u32le bit offset from the start of the packet
916 * u8 current quantizer at the start of the macroblock
918 * u16le macroblock address within the GOB
919 * u8 horizontal MV predictor
920 * u8 vertical MV predictor
921 * u8 horizontal MV predictor for block number 3
922 * u8 vertical MV predictor for block number 3
925 AV_PKT_DATA_H263_MB_INFO,
929 * This structure stores compressed data. It is typically exported by demuxers
930 * and then passed as input to decoders, or received as output from encoders and
931 * then passed to muxers.
933 * For video, it should typically contain one compressed frame. For audio it may
934 * contain several compressed frames.
936 * AVPacket is one of the few structs in Libav, whose size is a part of public
937 * ABI. Thus it may be allocated on stack and no new fields can be added to it
938 * without libavcodec and libavformat major bump.
940 * The semantics of data ownership depends on the buf or destruct (deprecated)
941 * fields. If either is set, the packet data is dynamically allocated and is
942 * valid indefinitely until av_free_packet() is called (which in turn calls
943 * av_buffer_unref()/the destruct callback to free the data). If neither is set,
944 * the packet data is typically backed by some static buffer somewhere and is
945 * only valid for a limited time (e.g. until the next read call when demuxing).
947 * The side data is always allocated with av_malloc() and is freed in
950 typedef struct AVPacket {
952 * A reference to the reference-counted buffer where the packet data is
954 * May be NULL, then the packet data is not reference-counted.
958 * Presentation timestamp in AVStream->time_base units; the time at which
959 * the decompressed packet will be presented to the user.
960 * Can be AV_NOPTS_VALUE if it is not stored in the file.
961 * pts MUST be larger or equal to dts as presentation cannot happen before
962 * decompression, unless one wants to view hex dumps. Some formats misuse
963 * the terms dts and pts/cts to mean something different. Such timestamps
964 * must be converted to true pts/dts before they are stored in AVPacket.
968 * Decompression timestamp in AVStream->time_base units; the time at which
969 * the packet is decompressed.
970 * Can be AV_NOPTS_VALUE if it is not stored in the file.
977 * A combination of AV_PKT_FLAG values
981 * Additional packet data that can be provided by the container.
982 * Packet can contain several types of side information.
987 enum AVPacketSideDataType type;
992 * Duration of this packet in AVStream->time_base units, 0 if unknown.
993 * Equals next_pts - this_pts in presentation order.
996 #if FF_API_DESTRUCT_PACKET
998 void (*destruct)(struct AVPacket *);
1002 int64_t pos; ///< byte position in stream, -1 if unknown
1005 * Time difference in AVStream->time_base units from the pts of this
1006 * packet to the point at which the output from the decoder has converged
1007 * independent from the availability of previous frames. That is, the
1008 * frames are virtually identical no matter if decoding started from
1009 * the very first frame or from this keyframe.
1010 * Is AV_NOPTS_VALUE if unknown.
1011 * This field is not the display duration of the current packet.
1012 * This field has no meaning if the packet does not have AV_PKT_FLAG_KEY
1015 * The purpose of this field is to allow seeking in streams that have no
1016 * keyframes in the conventional sense. It corresponds to the
1017 * recovery point SEI in H.264 and match_time_delta in NUT. It is also
1018 * essential for some types of subtitle streams to ensure that all
1019 * subtitles are correctly displayed after seeking.
1021 int64_t convergence_duration;
1023 #define AV_PKT_FLAG_KEY 0x0001 ///< The packet contains a keyframe
1024 #define AV_PKT_FLAG_CORRUPT 0x0002 ///< The packet content is corrupted
1026 enum AVSideDataParamChangeFlags {
1027 AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_COUNT = 0x0001,
1028 AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_LAYOUT = 0x0002,
1029 AV_SIDE_DATA_PARAM_CHANGE_SAMPLE_RATE = 0x0004,
1030 AV_SIDE_DATA_PARAM_CHANGE_DIMENSIONS = 0x0008,
1036 struct AVCodecInternal;
1040 AV_FIELD_PROGRESSIVE,
1041 AV_FIELD_TT, //< Top coded_first, top displayed first
1042 AV_FIELD_BB, //< Bottom coded first, bottom displayed first
1043 AV_FIELD_TB, //< Top coded first, bottom displayed first
1044 AV_FIELD_BT, //< Bottom coded first, top displayed first
1048 * main external API structure.
1049 * New fields can be added to the end with minor version bumps.
1050 * Removal, reordering and changes to existing fields require a major
1052 * sizeof(AVCodecContext) must not be used outside libav*.
1054 typedef struct AVCodecContext {
1056 * information on struct for av_log
1057 * - set by avcodec_alloc_context3
1059 const AVClass *av_class;
1060 int log_level_offset;
1062 enum AVMediaType codec_type; /* see AVMEDIA_TYPE_xxx */
1063 const struct AVCodec *codec;
1064 char codec_name[32];
1065 enum AVCodecID codec_id; /* see AV_CODEC_ID_xxx */
1068 * fourcc (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A').
1069 * This is used to work around some encoder bugs.
1070 * A demuxer should set this to what is stored in the field used to identify the codec.
1071 * If there are multiple such fields in a container then the demuxer should choose the one
1072 * which maximizes the information about the used codec.
1073 * If the codec tag field in a container is larger than 32 bits then the demuxer should
1074 * remap the longer ID to 32 bits with a table or other structure. Alternatively a new
1075 * extra_codec_tag + size could be added but for this a clear advantage must be demonstrated
1077 * - encoding: Set by user, if not then the default based on codec_id will be used.
1078 * - decoding: Set by user, will be converted to uppercase by libavcodec during init.
1080 unsigned int codec_tag;
1083 * fourcc from the AVI stream header (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A').
1084 * This is used to work around some encoder bugs.
1085 * - encoding: unused
1086 * - decoding: Set by user, will be converted to uppercase by libavcodec during init.
1088 unsigned int stream_codec_tag;
1093 * Private context used for internal data.
1095 * Unlike priv_data, this is not codec-specific. It is used in general
1096 * libavcodec functions.
1098 struct AVCodecInternal *internal;
1101 * Private data of the user, can be used to carry app specific stuff.
1102 * - encoding: Set by user.
1103 * - decoding: Set by user.
1108 * the average bitrate
1109 * - encoding: Set by user; unused for constant quantizer encoding.
1110 * - decoding: Set by libavcodec. 0 or some bitrate if this info is available in the stream.
1115 * number of bits the bitstream is allowed to diverge from the reference.
1116 * the reference can be CBR (for CBR pass1) or VBR (for pass2)
1117 * - encoding: Set by user; unused for constant quantizer encoding.
1118 * - decoding: unused
1120 int bit_rate_tolerance;
1123 * Global quality for codecs which cannot change it per frame.
1124 * This should be proportional to MPEG-1/2/4 qscale.
1125 * - encoding: Set by user.
1126 * - decoding: unused
1131 * - encoding: Set by user.
1132 * - decoding: unused
1134 int compression_level;
1135 #define FF_COMPRESSION_DEFAULT -1
1139 * - encoding: Set by user.
1140 * - decoding: Set by user.
1146 * - encoding: Set by user.
1147 * - decoding: Set by user.
1152 * some codecs need / can use extradata like Huffman tables.
1153 * mjpeg: Huffman tables
1154 * rv10: additional flags
1155 * mpeg4: global headers (they can be in the bitstream or here)
1156 * The allocated memory should be FF_INPUT_BUFFER_PADDING_SIZE bytes larger
1157 * than extradata_size to avoid prolems if it is read with the bitstream reader.
1158 * The bytewise contents of extradata must not depend on the architecture or CPU endianness.
1159 * - encoding: Set/allocated/freed by libavcodec.
1160 * - decoding: Set/allocated/freed by user.
1166 * This is the fundamental unit of time (in seconds) in terms
1167 * of which frame timestamps are represented. For fixed-fps content,
1168 * timebase should be 1/framerate and timestamp increments should be
1170 * - encoding: MUST be set by user.
1171 * - decoding: Set by libavcodec.
1173 AVRational time_base;
1176 * For some codecs, the time base is closer to the field rate than the frame rate.
1177 * Most notably, H.264 and MPEG-2 specify time_base as half of frame duration
1178 * if no telecine is used ...
1180 * Set to time_base ticks per frame. Default 1, e.g., H.264/MPEG-2 set it to 2.
1182 int ticks_per_frame;
1188 * Number of frames the decoded output will be delayed relative to the
1192 * For encoding, this is the number of "priming" samples added to the
1193 * beginning of the stream. The decoded output will be delayed by this
1194 * many samples relative to the input to the encoder. Note that this
1195 * field is purely informational and does not directly affect the pts
1196 * output by the encoder, which should always be based on the actual
1197 * presentation time, including any delay.
1198 * For decoding, this is the number of samples the decoder needs to
1199 * output before the decoder's output is valid. When seeking, you should
1200 * start decoding this many samples prior to your desired seek point.
1202 * - encoding: Set by libavcodec.
1203 * - decoding: Set by libavcodec.
1210 * picture width / height.
1211 * - encoding: MUST be set by user.
1212 * - decoding: May be set by the user before opening the decoder if known e.g.
1213 * from the container. Some decoders will require the dimensions
1214 * to be set by the caller. During decoding, the decoder may
1215 * overwrite those values as required.
1220 * Bitstream width / height, may be different from width/height e.g. when
1221 * the decoded frame is cropped before being output.
1222 * - encoding: unused
1223 * - decoding: May be set by the user before opening the decoder if known
1224 * e.g. from the container. During decoding, the decoder may
1225 * overwrite those values as required.
1227 int coded_width, coded_height;
1229 #if FF_API_ASPECT_EXTENDED
1230 #define FF_ASPECT_EXTENDED 15
1234 * the number of pictures in a group of pictures, or 0 for intra_only
1235 * - encoding: Set by user.
1236 * - decoding: unused
1241 * Pixel format, see AV_PIX_FMT_xxx.
1242 * May be set by the demuxer if known from headers.
1243 * May be overriden by the decoder if it knows better.
1244 * - encoding: Set by user.
1245 * - decoding: Set by user if known, overridden by libavcodec if known
1247 enum AVPixelFormat pix_fmt;
1250 * Motion estimation algorithm used for video coding.
1251 * 1 (zero), 2 (full), 3 (log), 4 (phods), 5 (epzs), 6 (x1), 7 (hex),
1252 * 8 (umh), 10 (tesa) [7, 8, 10 are x264 specific]
1253 * - encoding: MUST be set by user.
1254 * - decoding: unused
1259 * If non NULL, 'draw_horiz_band' is called by the libavcodec
1260 * decoder to draw a horizontal band. It improves cache usage. Not
1261 * all codecs can do that. You must check the codec capabilities
1263 * When multithreading is used, it may be called from multiple threads
1264 * at the same time; threads might draw different parts of the same AVFrame,
1265 * or multiple AVFrames, and there is no guarantee that slices will be drawn
1267 * The function is also used by hardware acceleration APIs.
1268 * It is called at least once during frame decoding to pass
1269 * the data needed for hardware render.
1270 * In that mode instead of pixel data, AVFrame points to
1271 * a structure specific to the acceleration API. The application
1272 * reads the structure and can change some fields to indicate progress
1274 * - encoding: unused
1275 * - decoding: Set by user.
1276 * @param height the height of the slice
1277 * @param y the y position of the slice
1278 * @param type 1->top field, 2->bottom field, 3->frame
1279 * @param offset offset into the AVFrame.data from which the slice should be read
1281 void (*draw_horiz_band)(struct AVCodecContext *s,
1282 const AVFrame *src, int offset[AV_NUM_DATA_POINTERS],
1283 int y, int type, int height);
1286 * callback to negotiate the pixelFormat
1287 * @param fmt is the list of formats which are supported by the codec,
1288 * it is terminated by -1 as 0 is a valid format, the formats are ordered by quality.
1289 * The first is always the native one.
1290 * @return the chosen format
1291 * - encoding: unused
1292 * - decoding: Set by user, if not set the native format will be chosen.
1294 enum AVPixelFormat (*get_format)(struct AVCodecContext *s, const enum AVPixelFormat * fmt);
1297 * maximum number of B-frames between non-B-frames
1298 * Note: The output will be delayed by max_b_frames+1 relative to the input.
1299 * - encoding: Set by user.
1300 * - decoding: unused
1305 * qscale factor between IP and B-frames
1306 * If > 0 then the last P-frame quantizer will be used (q= lastp_q*factor+offset).
1307 * If < 0 then normal ratecontrol will be done (q= -normal_q*factor+offset).
1308 * - encoding: Set by user.
1309 * - decoding: unused
1311 float b_quant_factor;
1313 /** obsolete FIXME remove */
1315 #define FF_RC_STRATEGY_XVID 1
1317 int b_frame_strategy;
1320 * qscale offset between IP and B-frames
1321 * - encoding: Set by user.
1322 * - decoding: unused
1324 float b_quant_offset;
1327 * Size of the frame reordering buffer in the decoder.
1328 * For MPEG-2 it is 1 IPB or 0 low delay IP.
1329 * - encoding: Set by libavcodec.
1330 * - decoding: Set by libavcodec.
1335 * 0-> h263 quant 1-> mpeg quant
1336 * - encoding: Set by user.
1337 * - decoding: unused
1342 * qscale factor between P and I-frames
1343 * If > 0 then the last p frame quantizer will be used (q= lastp_q*factor+offset).
1344 * If < 0 then normal ratecontrol will be done (q= -normal_q*factor+offset).
1345 * - encoding: Set by user.
1346 * - decoding: unused
1348 float i_quant_factor;
1351 * qscale offset between P and I-frames
1352 * - encoding: Set by user.
1353 * - decoding: unused
1355 float i_quant_offset;
1358 * luminance masking (0-> disabled)
1359 * - encoding: Set by user.
1360 * - decoding: unused
1365 * temporary complexity masking (0-> disabled)
1366 * - encoding: Set by user.
1367 * - decoding: unused
1369 float temporal_cplx_masking;
1372 * spatial complexity masking (0-> disabled)
1373 * - encoding: Set by user.
1374 * - decoding: unused
1376 float spatial_cplx_masking;
1379 * p block masking (0-> disabled)
1380 * - encoding: Set by user.
1381 * - decoding: unused
1386 * darkness masking (0-> disabled)
1387 * - encoding: Set by user.
1388 * - decoding: unused
1394 * - encoding: Set by libavcodec.
1395 * - decoding: Set by user (or 0).
1399 * prediction method (needed for huffyuv)
1400 * - encoding: Set by user.
1401 * - decoding: unused
1403 int prediction_method;
1404 #define FF_PRED_LEFT 0
1405 #define FF_PRED_PLANE 1
1406 #define FF_PRED_MEDIAN 2
1409 * slice offsets in the frame in bytes
1410 * - encoding: Set/allocated by libavcodec.
1411 * - decoding: Set/allocated by user (or NULL).
1416 * sample aspect ratio (0 if unknown)
1417 * That is the width of a pixel divided by the height of the pixel.
1418 * Numerator and denominator must be relatively prime and smaller than 256 for some video standards.
1419 * - encoding: Set by user.
1420 * - decoding: Set by libavcodec.
1422 AVRational sample_aspect_ratio;
1425 * motion estimation comparison function
1426 * - encoding: Set by user.
1427 * - decoding: unused
1431 * subpixel motion estimation comparison function
1432 * - encoding: Set by user.
1433 * - decoding: unused
1437 * macroblock comparison function (not supported yet)
1438 * - encoding: Set by user.
1439 * - decoding: unused
1443 * interlaced DCT comparison function
1444 * - encoding: Set by user.
1445 * - decoding: unused
1448 #define FF_CMP_SAD 0
1449 #define FF_CMP_SSE 1
1450 #define FF_CMP_SATD 2
1451 #define FF_CMP_DCT 3
1452 #define FF_CMP_PSNR 4
1453 #define FF_CMP_BIT 5
1455 #define FF_CMP_ZERO 7
1456 #define FF_CMP_VSAD 8
1457 #define FF_CMP_VSSE 9
1458 #define FF_CMP_NSSE 10
1459 #define FF_CMP_DCTMAX 13
1460 #define FF_CMP_DCT264 14
1461 #define FF_CMP_CHROMA 256
1464 * ME diamond size & shape
1465 * - encoding: Set by user.
1466 * - decoding: unused
1471 * amount of previous MV predictors (2a+1 x 2a+1 square)
1472 * - encoding: Set by user.
1473 * - decoding: unused
1475 int last_predictor_count;
1478 * prepass for motion estimation
1479 * - encoding: Set by user.
1480 * - decoding: unused
1485 * motion estimation prepass comparison function
1486 * - encoding: Set by user.
1487 * - decoding: unused
1492 * ME prepass diamond size & shape
1493 * - encoding: Set by user.
1494 * - decoding: unused
1500 * - encoding: Set by user.
1501 * - decoding: unused
1503 int me_subpel_quality;
1506 * DTG active format information (additional aspect ratio
1507 * information only used in DVB MPEG-2 transport streams)
1510 * - encoding: unused
1511 * - decoding: Set by decoder.
1513 int dtg_active_format;
1514 #define FF_DTG_AFD_SAME 8
1515 #define FF_DTG_AFD_4_3 9
1516 #define FF_DTG_AFD_16_9 10
1517 #define FF_DTG_AFD_14_9 11
1518 #define FF_DTG_AFD_4_3_SP_14_9 13
1519 #define FF_DTG_AFD_16_9_SP_14_9 14
1520 #define FF_DTG_AFD_SP_4_3 15
1523 * maximum motion estimation search range in subpel units
1524 * If 0 then no limit.
1526 * - encoding: Set by user.
1527 * - decoding: unused
1532 * intra quantizer bias
1533 * - encoding: Set by user.
1534 * - decoding: unused
1536 int intra_quant_bias;
1537 #define FF_DEFAULT_QUANT_BIAS 999999
1540 * inter quantizer bias
1541 * - encoding: Set by user.
1542 * - decoding: unused
1544 int inter_quant_bias;
1548 * - encoding: unused
1549 * - decoding: Set by user.
1552 #define SLICE_FLAG_CODED_ORDER 0x0001 ///< draw_horiz_band() is called in coded order instead of display
1553 #define SLICE_FLAG_ALLOW_FIELD 0x0002 ///< allow draw_horiz_band() with field slices (MPEG2 field pics)
1554 #define SLICE_FLAG_ALLOW_PLANE 0x0004 ///< allow draw_horiz_band() with 1 component at a time (SVQ1)
1558 * XVideo Motion Acceleration
1559 * - encoding: forbidden
1560 * - decoding: set by decoder
1561 * @deprecated XvMC support is slated for removal.
1563 attribute_deprecated int xvmc_acceleration;
1564 #endif /* FF_API_XVMC */
1567 * macroblock decision mode
1568 * - encoding: Set by user.
1569 * - decoding: unused
1572 #define FF_MB_DECISION_SIMPLE 0 ///< uses mb_cmp
1573 #define FF_MB_DECISION_BITS 1 ///< chooses the one which needs the fewest bits
1574 #define FF_MB_DECISION_RD 2 ///< rate distortion
1577 * custom intra quantization matrix
1578 * - encoding: Set by user, can be NULL.
1579 * - decoding: Set by libavcodec.
1581 uint16_t *intra_matrix;
1584 * custom inter quantization matrix
1585 * - encoding: Set by user, can be NULL.
1586 * - decoding: Set by libavcodec.
1588 uint16_t *inter_matrix;
1591 * scene change detection threshold
1592 * 0 is default, larger means fewer detected scene changes.
1593 * - encoding: Set by user.
1594 * - decoding: unused
1596 int scenechange_threshold;
1599 * noise reduction strength
1600 * - encoding: Set by user.
1601 * - decoding: unused
1603 int noise_reduction;
1606 * Motion estimation threshold below which no motion estimation is
1607 * performed, but instead the user specified motion vectors are used.
1609 * - encoding: Set by user.
1610 * - decoding: unused
1615 * Macroblock threshold below which the user specified macroblock types will be used.
1616 * - encoding: Set by user.
1617 * - decoding: unused
1622 * precision of the intra DC coefficient - 8
1623 * - encoding: Set by user.
1624 * - decoding: unused
1626 int intra_dc_precision;
1629 * Number of macroblock rows at the top which are skipped.
1630 * - encoding: unused
1631 * - decoding: Set by user.
1636 * Number of macroblock rows at the bottom which are skipped.
1637 * - encoding: unused
1638 * - decoding: Set by user.
1643 * Border processing masking, raises the quantizer for mbs on the borders
1645 * - encoding: Set by user.
1646 * - decoding: unused
1648 float border_masking;
1651 * minimum MB lagrange multipler
1652 * - encoding: Set by user.
1653 * - decoding: unused
1658 * maximum MB lagrange multipler
1659 * - encoding: Set by user.
1660 * - decoding: unused
1666 * - encoding: Set by user.
1667 * - decoding: unused
1669 int me_penalty_compensation;
1673 * - encoding: Set by user.
1674 * - decoding: unused
1680 * - encoding: Set by user.
1681 * - decoding: unused
1687 * - encoding: Set by user.
1688 * - decoding: unused
1693 * number of reference frames
1694 * - encoding: Set by user.
1695 * - decoding: Set by lavc.
1700 * chroma qp offset from luma
1701 * - encoding: Set by user.
1702 * - decoding: unused
1707 * Multiplied by qscale for each frame and added to scene_change_score.
1708 * - encoding: Set by user.
1709 * - decoding: unused
1711 int scenechange_factor;
1715 * Note: Value depends upon the compare function used for fullpel ME.
1716 * - encoding: Set by user.
1717 * - decoding: unused
1722 * Adjust sensitivity of b_frame_strategy 1.
1723 * - encoding: Set by user.
1724 * - decoding: unused
1729 * Chromaticity coordinates of the source primaries.
1730 * - encoding: Set by user
1731 * - decoding: Set by libavcodec
1733 enum AVColorPrimaries color_primaries;
1736 * Color Transfer Characteristic.
1737 * - encoding: Set by user
1738 * - decoding: Set by libavcodec
1740 enum AVColorTransferCharacteristic color_trc;
1743 * YUV colorspace type.
1744 * - encoding: Set by user
1745 * - decoding: Set by libavcodec
1747 enum AVColorSpace colorspace;
1750 * MPEG vs JPEG YUV range.
1751 * - encoding: Set by user
1752 * - decoding: Set by libavcodec
1754 enum AVColorRange color_range;
1757 * This defines the location of chroma samples.
1758 * - encoding: Set by user
1759 * - decoding: Set by libavcodec
1761 enum AVChromaLocation chroma_sample_location;
1765 * Indicates number of picture subdivisions. Used for parallelized
1767 * - encoding: Set by user
1768 * - decoding: unused
1773 * - encoding: set by libavcodec
1774 * - decoding: Set by libavcodec
1776 enum AVFieldOrder field_order;
1779 int sample_rate; ///< samples per second
1780 int channels; ///< number of audio channels
1783 * audio sample format
1784 * - encoding: Set by user.
1785 * - decoding: Set by libavcodec.
1787 enum AVSampleFormat sample_fmt; ///< sample format
1789 /* The following data should not be initialized. */
1791 * Number of samples per channel in an audio frame.
1793 * - encoding: set by libavcodec in avcodec_open2(). Each submitted frame
1794 * except the last must contain exactly frame_size samples per channel.
1795 * May be 0 when the codec has CODEC_CAP_VARIABLE_FRAME_SIZE set, then the
1796 * frame size is not restricted.
1797 * - decoding: may be set by some decoders to indicate constant frame size
1802 * Frame counter, set by libavcodec.
1804 * - decoding: total number of frames returned from the decoder so far.
1805 * - encoding: total number of frames passed to the encoder so far.
1807 * @note the counter is not incremented if encoding/decoding resulted in
1813 * number of bytes per packet if constant and known or 0
1814 * Used by some WAV based audio codecs.
1819 * Audio cutoff bandwidth (0 means "automatic")
1820 * - encoding: Set by user.
1821 * - decoding: unused
1825 #if FF_API_REQUEST_CHANNELS
1827 * Decoder should decode to this many channels if it can (0 for default)
1828 * - encoding: unused
1829 * - decoding: Set by user.
1830 * @deprecated Deprecated in favor of request_channel_layout.
1832 attribute_deprecated int request_channels;
1836 * Audio channel layout.
1837 * - encoding: set by user.
1838 * - decoding: set by libavcodec.
1840 uint64_t channel_layout;
1843 * Request decoder to use this channel layout if it can (0 for default)
1844 * - encoding: unused
1845 * - decoding: Set by user.
1847 uint64_t request_channel_layout;
1850 * Type of service that the audio stream conveys.
1851 * - encoding: Set by user.
1852 * - decoding: Set by libavcodec.
1854 enum AVAudioServiceType audio_service_type;
1857 * Used to request a sample format from the decoder.
1858 * - encoding: unused.
1859 * - decoding: Set by user.
1861 enum AVSampleFormat request_sample_fmt;
1863 #if FF_API_GET_BUFFER
1865 * Called at the beginning of each frame to get a buffer for it.
1867 * The function will set AVFrame.data[], AVFrame.linesize[].
1868 * AVFrame.extended_data[] must also be set, but it should be the same as
1869 * AVFrame.data[] except for planar audio with more channels than can fit
1870 * in AVFrame.data[]. In that case, AVFrame.data[] shall still contain as
1871 * many data pointers as it can hold.
1873 * if CODEC_CAP_DR1 is not set then get_buffer() must call
1874 * avcodec_default_get_buffer() instead of providing buffers allocated by
1877 * AVFrame.data[] should be 32- or 16-byte-aligned unless the CPU doesn't
1878 * need it. avcodec_default_get_buffer() aligns the output buffer properly,
1879 * but if get_buffer() is overridden then alignment considerations should
1880 * be taken into account.
1882 * @see avcodec_default_get_buffer()
1886 * If pic.reference is set then the frame will be read later by libavcodec.
1887 * avcodec_align_dimensions2() should be used to find the required width and
1888 * height, as they normally need to be rounded up to the next multiple of 16.
1890 * If frame multithreading is used and thread_safe_callbacks is set,
1891 * it may be called from a different thread, but not from more than one at
1892 * once. Does not need to be reentrant.
1894 * @see release_buffer(), reget_buffer()
1895 * @see avcodec_align_dimensions2()
1899 * Decoders request a buffer of a particular size by setting
1900 * AVFrame.nb_samples prior to calling get_buffer(). The decoder may,
1901 * however, utilize only part of the buffer by setting AVFrame.nb_samples
1902 * to a smaller value in the output frame.
1904 * Decoders cannot use the buffer after returning from
1905 * avcodec_decode_audio4(), so they will not call release_buffer(), as it
1906 * is assumed to be released immediately upon return. In some rare cases,
1907 * a decoder may need to call get_buffer() more than once in a single
1908 * call to avcodec_decode_audio4(). In that case, when get_buffer() is
1909 * called again after it has already been called once, the previously
1910 * acquired buffer is assumed to be released at that time and may not be
1911 * reused by the decoder.
1913 * As a convenience, av_samples_get_buffer_size() and
1914 * av_samples_fill_arrays() in libavutil may be used by custom get_buffer()
1915 * functions to find the required data size and to fill data pointers and
1916 * linesize. In AVFrame.linesize, only linesize[0] may be set for audio
1917 * since all planes must be the same size.
1919 * @see av_samples_get_buffer_size(), av_samples_fill_arrays()
1921 * - encoding: unused
1922 * - decoding: Set by libavcodec, user can override.
1924 * @deprecated use get_buffer2()
1926 attribute_deprecated
1927 int (*get_buffer)(struct AVCodecContext *c, AVFrame *pic);
1930 * Called to release buffers which were allocated with get_buffer.
1931 * A released buffer can be reused in get_buffer().
1932 * pic.data[*] must be set to NULL.
1933 * May be called from a different thread if frame multithreading is used,
1934 * but not by more than one thread at once, so does not need to be reentrant.
1935 * - encoding: unused
1936 * - decoding: Set by libavcodec, user can override.
1938 * @deprecated custom freeing callbacks should be set from get_buffer2()
1940 attribute_deprecated
1941 void (*release_buffer)(struct AVCodecContext *c, AVFrame *pic);
1944 * Called at the beginning of a frame to get cr buffer for it.
1945 * Buffer type (size, hints) must be the same. libavcodec won't check it.
1946 * libavcodec will pass previous buffer in pic, function should return
1947 * same buffer or new buffer with old frame "painted" into it.
1948 * If pic.data[0] == NULL must behave like get_buffer().
1949 * if CODEC_CAP_DR1 is not set then reget_buffer() must call
1950 * avcodec_default_reget_buffer() instead of providing buffers allocated by
1952 * - encoding: unused
1953 * - decoding: Set by libavcodec, user can override.
1955 attribute_deprecated
1956 int (*reget_buffer)(struct AVCodecContext *c, AVFrame *pic);
1960 * This callback is called at the beginning of each frame to get data
1961 * buffer(s) for it. There may be one contiguous buffer for all the data or
1962 * there may be a buffer per each data plane or anything in between. What
1963 * this means is, you may set however many entries in buf[] you feel necessary.
1964 * Each buffer must be reference-counted using the AVBuffer API (see description
1967 * The following fields will be set in the frame before this callback is
1970 * - width, height (video only)
1971 * - sample_rate, channel_layout, nb_samples (audio only)
1972 * Their values may differ from the corresponding values in
1973 * AVCodecContext. This callback must use the frame values, not the codec
1974 * context values, to calculate the required buffer size.
1976 * This callback must fill the following fields in the frame:
1980 * * if the data is planar audio with more than 8 channels, then this
1981 * callback must allocate and fill extended_data to contain all pointers
1982 * to all data planes. data[] must hold as many pointers as it can.
1983 * extended_data must be allocated with av_malloc() and will be freed in
1985 * * otherwise exended_data must point to data
1986 * - buf[] must contain one or more pointers to AVBufferRef structures. Each of
1987 * the frame's data and extended_data pointers must be contained in these. That
1988 * is, one AVBufferRef for each allocated chunk of memory, not necessarily one
1989 * AVBufferRef per data[] entry. See: av_buffer_create(), av_buffer_alloc(),
1990 * and av_buffer_ref().
1991 * - extended_buf and nb_extended_buf must be allocated with av_malloc() by
1992 * this callback and filled with the extra buffers if there are more
1993 * buffers than buf[] can hold. extended_buf will be freed in
1996 * If CODEC_CAP_DR1 is not set then get_buffer2() must call
1997 * avcodec_default_get_buffer2() instead of providing buffers allocated by
2000 * Each data plane must be aligned to the maximum required by the target
2003 * @see avcodec_default_get_buffer2()
2007 * If AV_GET_BUFFER_FLAG_REF is set in flags then the frame may be reused
2008 * (read and/or written to if it is writable) later by libavcodec.
2010 * avcodec_align_dimensions2() should be used to find the required width and
2011 * height, as they normally need to be rounded up to the next multiple of 16.
2013 * If frame multithreading is used and thread_safe_callbacks is set,
2014 * this callback may be called from a different thread, but not from more
2015 * than one at once. Does not need to be reentrant.
2017 * @see avcodec_align_dimensions2()
2021 * Decoders request a buffer of a particular size by setting
2022 * AVFrame.nb_samples prior to calling get_buffer2(). The decoder may,
2023 * however, utilize only part of the buffer by setting AVFrame.nb_samples
2024 * to a smaller value in the output frame.
2026 * As a convenience, av_samples_get_buffer_size() and
2027 * av_samples_fill_arrays() in libavutil may be used by custom get_buffer2()
2028 * functions to find the required data size and to fill data pointers and
2029 * linesize. In AVFrame.linesize, only linesize[0] may be set for audio
2030 * since all planes must be the same size.
2032 * @see av_samples_get_buffer_size(), av_samples_fill_arrays()
2034 * - encoding: unused
2035 * - decoding: Set by libavcodec, user can override.
2037 int (*get_buffer2)(struct AVCodecContext *s, AVFrame *frame, int flags);
2040 * If non-zero, the decoded audio and video frames returned from
2041 * avcodec_decode_video2() and avcodec_decode_audio4() are reference-counted
2042 * and are valid indefinitely. The caller must free them with
2043 * av_frame_unref() when they are not needed anymore.
2044 * Otherwise, the decoded frames must not be freed by the caller and are
2045 * only valid until the next decode call.
2047 * - encoding: unused
2048 * - decoding: set by the caller before avcodec_open2().
2050 int refcounted_frames;
2052 /* - encoding parameters */
2053 float qcompress; ///< amount of qscale change between easy & hard scenes (0.0-1.0)
2054 float qblur; ///< amount of qscale smoothing over time (0.0-1.0)
2058 * - encoding: Set by user.
2059 * - decoding: unused
2065 * - encoding: Set by user.
2066 * - decoding: unused
2071 * maximum quantizer difference between frames
2072 * - encoding: Set by user.
2073 * - decoding: unused
2078 * ratecontrol qmin qmax limiting method
2079 * 0-> clipping, 1-> use a nice continuous function to limit qscale wthin qmin/qmax.
2080 * - encoding: Set by user.
2081 * - decoding: unused
2089 * decoder bitstream buffer size
2090 * - encoding: Set by user.
2091 * - decoding: unused
2096 * ratecontrol override, see RcOverride
2097 * - encoding: Allocated/set/freed by user.
2098 * - decoding: unused
2100 int rc_override_count;
2101 RcOverride *rc_override;
2104 * rate control equation
2105 * - encoding: Set by user
2106 * - decoding: unused
2112 * - encoding: Set by user.
2113 * - decoding: unused
2119 * - encoding: Set by user.
2120 * - decoding: unused
2124 float rc_buffer_aggressivity;
2127 * initial complexity for pass1 ratecontrol
2128 * - encoding: Set by user.
2129 * - decoding: unused
2131 float rc_initial_cplx;
2134 * Ratecontrol attempt to use, at maximum, <value> of what can be used without an underflow.
2135 * - encoding: Set by user.
2136 * - decoding: unused.
2138 float rc_max_available_vbv_use;
2141 * Ratecontrol attempt to use, at least, <value> times the amount needed to prevent a vbv overflow.
2142 * - encoding: Set by user.
2143 * - decoding: unused.
2145 float rc_min_vbv_overflow_use;
2148 * Number of bits which should be loaded into the rc buffer before decoding starts.
2149 * - encoding: Set by user.
2150 * - decoding: unused
2152 int rc_initial_buffer_occupancy;
2154 #define FF_CODER_TYPE_VLC 0
2155 #define FF_CODER_TYPE_AC 1
2156 #define FF_CODER_TYPE_RAW 2
2157 #define FF_CODER_TYPE_RLE 3
2158 #define FF_CODER_TYPE_DEFLATE 4
2161 * - encoding: Set by user.
2162 * - decoding: unused
2168 * - encoding: Set by user.
2169 * - decoding: unused
2174 * minimum Lagrange multipler
2175 * - encoding: Set by user.
2176 * - decoding: unused
2181 * maximum Lagrange multipler
2182 * - encoding: Set by user.
2183 * - decoding: unused
2188 * frame skip threshold
2189 * - encoding: Set by user.
2190 * - decoding: unused
2192 int frame_skip_threshold;
2196 * - encoding: Set by user.
2197 * - decoding: unused
2199 int frame_skip_factor;
2202 * frame skip exponent
2203 * - encoding: Set by user.
2204 * - decoding: unused
2209 * frame skip comparison function
2210 * - encoding: Set by user.
2211 * - decoding: unused
2216 * trellis RD quantization
2217 * - encoding: Set by user.
2218 * - decoding: unused
2223 * - encoding: Set by user.
2224 * - decoding: unused
2226 int min_prediction_order;
2229 * - encoding: Set by user.
2230 * - decoding: unused
2232 int max_prediction_order;
2235 * GOP timecode frame start number, in non drop frame format
2236 * - encoding: Set by user.
2237 * - decoding: unused
2239 int64_t timecode_frame_start;
2241 /* The RTP callback: This function is called */
2242 /* every time the encoder has a packet to send. */
2243 /* It depends on the encoder if the data starts */
2244 /* with a Start Code (it should). H.263 does. */
2245 /* mb_nb contains the number of macroblocks */
2246 /* encoded in the RTP payload. */
2247 void (*rtp_callback)(struct AVCodecContext *avctx, void *data, int size, int mb_nb);
2249 int rtp_payload_size; /* The size of the RTP payload: the coder will */
2250 /* do its best to deliver a chunk with size */
2251 /* below rtp_payload_size, the chunk will start */
2252 /* with a start code on some codecs like H.263. */
2253 /* This doesn't take account of any particular */
2254 /* headers inside the transmitted RTP payload. */
2256 /* statistics, used for 2-pass encoding */
2267 * number of bits used for the previously encoded frame
2268 * - encoding: Set by libavcodec.
2269 * - decoding: unused
2274 * pass1 encoding statistics output buffer
2275 * - encoding: Set by libavcodec.
2276 * - decoding: unused
2281 * pass2 encoding statistics input buffer
2282 * Concatenated stuff from stats_out of pass1 should be placed here.
2283 * - encoding: Allocated/set/freed by user.
2284 * - decoding: unused
2289 * Work around bugs in encoders which sometimes cannot be detected automatically.
2290 * - encoding: Set by user
2291 * - decoding: Set by user
2293 int workaround_bugs;
2294 #define FF_BUG_AUTODETECT 1 ///< autodetection
2295 #if FF_API_OLD_MSMPEG4
2296 #define FF_BUG_OLD_MSMPEG4 2
2298 #define FF_BUG_XVID_ILACE 4
2299 #define FF_BUG_UMP4 8
2300 #define FF_BUG_NO_PADDING 16
2301 #define FF_BUG_AMV 32
2303 #define FF_BUG_AC_VLC 0 ///< Will be removed, libavcodec can now handle these non-compliant files by default.
2305 #define FF_BUG_QPEL_CHROMA 64
2306 #define FF_BUG_STD_QPEL 128
2307 #define FF_BUG_QPEL_CHROMA2 256
2308 #define FF_BUG_DIRECT_BLOCKSIZE 512
2309 #define FF_BUG_EDGE 1024
2310 #define FF_BUG_HPEL_CHROMA 2048
2311 #define FF_BUG_DC_CLIP 4096
2312 #define FF_BUG_MS 8192 ///< Work around various bugs in Microsoft's broken decoders.
2313 #define FF_BUG_TRUNCATED 16384
2316 * strictly follow the standard (MPEG4, ...).
2317 * - encoding: Set by user.
2318 * - decoding: Set by user.
2319 * Setting this to STRICT or higher means the encoder and decoder will
2320 * generally do stupid things, whereas setting it to unofficial or lower
2321 * will mean the encoder might produce output that is not supported by all
2322 * spec-compliant decoders. Decoders don't differentiate between normal,
2323 * unofficial and experimental (that is, they always try to decode things
2324 * when they can) unless they are explicitly asked to behave stupidly
2325 * (=strictly conform to the specs)
2327 int strict_std_compliance;
2328 #define FF_COMPLIANCE_VERY_STRICT 2 ///< Strictly conform to an older more strict version of the spec or reference software.
2329 #define FF_COMPLIANCE_STRICT 1 ///< Strictly conform to all the things in the spec no matter what consequences.
2330 #define FF_COMPLIANCE_NORMAL 0
2331 #define FF_COMPLIANCE_UNOFFICIAL -1 ///< Allow unofficial extensions
2332 #define FF_COMPLIANCE_EXPERIMENTAL -2 ///< Allow nonstandardized experimental things.
2335 * error concealment flags
2336 * - encoding: unused
2337 * - decoding: Set by user.
2339 int error_concealment;
2340 #define FF_EC_GUESS_MVS 1
2341 #define FF_EC_DEBLOCK 2
2345 * - encoding: Set by user.
2346 * - decoding: Set by user.
2349 #define FF_DEBUG_PICT_INFO 1
2350 #define FF_DEBUG_RC 2
2351 #define FF_DEBUG_BITSTREAM 4
2352 #define FF_DEBUG_MB_TYPE 8
2353 #define FF_DEBUG_QP 16
2356 * @deprecated this option does nothing
2358 #define FF_DEBUG_MV 32
2360 #define FF_DEBUG_DCT_COEFF 0x00000040
2361 #define FF_DEBUG_SKIP 0x00000080
2362 #define FF_DEBUG_STARTCODE 0x00000100
2363 #define FF_DEBUG_PTS 0x00000200
2364 #define FF_DEBUG_ER 0x00000400
2365 #define FF_DEBUG_MMCO 0x00000800
2366 #define FF_DEBUG_BUGS 0x00001000
2368 #define FF_DEBUG_VIS_QP 0x00002000
2369 #define FF_DEBUG_VIS_MB_TYPE 0x00004000
2371 #define FF_DEBUG_BUFFERS 0x00008000
2372 #define FF_DEBUG_THREADS 0x00010000
2376 * @deprecated this option does not have any effect
2378 attribute_deprecated
2380 #define FF_DEBUG_VIS_MV_P_FOR 0x00000001 //visualize forward predicted MVs of P frames
2381 #define FF_DEBUG_VIS_MV_B_FOR 0x00000002 //visualize forward predicted MVs of B frames
2382 #define FF_DEBUG_VIS_MV_B_BACK 0x00000004 //visualize backward predicted MVs of B frames
2386 * Error recognition; may misdetect some more or less valid parts as errors.
2387 * - encoding: unused
2388 * - decoding: Set by user.
2390 int err_recognition;
2393 * Verify checksums embedded in the bitstream (could be of either encoded or
2394 * decoded data, depending on the codec) and print an error message on mismatch.
2395 * If AV_EF_EXPLODE is also set, a mismatching checksum will result in the
2396 * decoder returning an error.
2398 #define AV_EF_CRCCHECK (1<<0)
2399 #define AV_EF_BITSTREAM (1<<1)
2400 #define AV_EF_BUFFER (1<<2)
2401 #define AV_EF_EXPLODE (1<<3)
2404 * opaque 64bit number (generally a PTS) that will be reordered and
2405 * output in AVFrame.reordered_opaque
2406 * @deprecated in favor of pkt_pts
2407 * - encoding: unused
2408 * - decoding: Set by user.
2410 int64_t reordered_opaque;
2413 * Hardware accelerator in use
2414 * - encoding: unused.
2415 * - decoding: Set by libavcodec
2417 struct AVHWAccel *hwaccel;
2420 * Hardware accelerator context.
2421 * For some hardware accelerators, a global context needs to be
2422 * provided by the user. In that case, this holds display-dependent
2423 * data Libav cannot instantiate itself. Please refer to the
2424 * Libav HW accelerator documentation to know how to fill this
2425 * is. e.g. for VA API, this is a struct vaapi_context.
2426 * - encoding: unused
2427 * - decoding: Set by user
2429 void *hwaccel_context;
2433 * - encoding: Set by libavcodec if flags&CODEC_FLAG_PSNR.
2434 * - decoding: unused
2436 uint64_t error[AV_NUM_DATA_POINTERS];
2439 * DCT algorithm, see FF_DCT_* below
2440 * - encoding: Set by user.
2441 * - decoding: unused
2444 #define FF_DCT_AUTO 0
2445 #define FF_DCT_FASTINT 1
2446 #define FF_DCT_INT 2
2447 #define FF_DCT_MMX 3
2448 #define FF_DCT_ALTIVEC 5
2449 #define FF_DCT_FAAN 6
2452 * IDCT algorithm, see FF_IDCT_* below.
2453 * - encoding: Set by user.
2454 * - decoding: Set by user.
2457 #define FF_IDCT_AUTO 0
2458 #define FF_IDCT_INT 1
2459 #define FF_IDCT_SIMPLE 2
2460 #define FF_IDCT_SIMPLEMMX 3
2461 #define FF_IDCT_ARM 7
2462 #define FF_IDCT_ALTIVEC 8
2464 #define FF_IDCT_SH4 9
2466 #define FF_IDCT_SIMPLEARM 10
2467 #define FF_IDCT_IPP 13
2468 #define FF_IDCT_XVIDMMX 14
2469 #define FF_IDCT_SIMPLEARMV5TE 16
2470 #define FF_IDCT_SIMPLEARMV6 17
2471 #if FF_API_ARCH_SPARC
2472 #define FF_IDCT_SIMPLEVIS 18
2474 #define FF_IDCT_FAAN 20
2475 #define FF_IDCT_SIMPLENEON 22
2476 #if FF_API_ARCH_ALPHA
2477 #define FF_IDCT_SIMPLEALPHA 23
2481 * bits per sample/pixel from the demuxer (needed for huffyuv).
2482 * - encoding: Set by libavcodec.
2483 * - decoding: Set by user.
2485 int bits_per_coded_sample;
2488 * Bits per sample/pixel of internal libavcodec pixel/sample format.
2489 * - encoding: set by user.
2490 * - decoding: set by libavcodec.
2492 int bits_per_raw_sample;
2496 * low resolution decoding, 1-> 1/2 size, 2->1/4 size
2497 * - encoding: unused
2498 * - decoding: Set by user.
2500 * @deprecated use decoder private options instead
2502 attribute_deprecated int lowres;
2506 * the picture in the bitstream
2507 * - encoding: Set by libavcodec.
2508 * - decoding: unused
2510 AVFrame *coded_frame;
2514 * is used to decide how many independent tasks should be passed to execute()
2515 * - encoding: Set by user.
2516 * - decoding: Set by user.
2521 * Which multithreading methods to use.
2522 * Use of FF_THREAD_FRAME will increase decoding delay by one frame per thread,
2523 * so clients which cannot provide future frames should not use it.
2525 * - encoding: Set by user, otherwise the default is used.
2526 * - decoding: Set by user, otherwise the default is used.
2529 #define FF_THREAD_FRAME 1 ///< Decode more than one frame at once
2530 #define FF_THREAD_SLICE 2 ///< Decode more than one part of a single frame at once
2533 * Which multithreading methods are in use by the codec.
2534 * - encoding: Set by libavcodec.
2535 * - decoding: Set by libavcodec.
2537 int active_thread_type;
2540 * Set by the client if its custom get_buffer() callback can be called
2541 * synchronously from another thread, which allows faster multithreaded decoding.
2542 * draw_horiz_band() will be called from other threads regardless of this setting.
2543 * Ignored if the default get_buffer() is used.
2544 * - encoding: Set by user.
2545 * - decoding: Set by user.
2547 int thread_safe_callbacks;
2550 * The codec may call this to execute several independent things.
2551 * It will return only after finishing all tasks.
2552 * The user may replace this with some multithreaded implementation,
2553 * the default implementation will execute the parts serially.
2554 * @param count the number of things to execute
2555 * - encoding: Set by libavcodec, user can override.
2556 * - decoding: Set by libavcodec, user can override.
2558 int (*execute)(struct AVCodecContext *c, int (*func)(struct AVCodecContext *c2, void *arg), void *arg2, int *ret, int count, int size);
2561 * The codec may call this to execute several independent things.
2562 * It will return only after finishing all tasks.
2563 * The user may replace this with some multithreaded implementation,
2564 * the default implementation will execute the parts serially.
2565 * Also see avcodec_thread_init and e.g. the --enable-pthread configure option.
2566 * @param c context passed also to func
2567 * @param count the number of things to execute
2568 * @param arg2 argument passed unchanged to func
2569 * @param ret return values of executed functions, must have space for "count" values. May be NULL.
2570 * @param func function that will be called count times, with jobnr from 0 to count-1.
2571 * threadnr will be in the range 0 to c->thread_count-1 < MAX_THREADS and so that no
2572 * two instances of func executing at the same time will have the same threadnr.
2573 * @return always 0 currently, but code should handle a future improvement where when any call to func
2574 * returns < 0 no further calls to func may be done and < 0 is returned.
2575 * - encoding: Set by libavcodec, user can override.
2576 * - decoding: Set by libavcodec, user can override.
2578 int (*execute2)(struct AVCodecContext *c, int (*func)(struct AVCodecContext *c2, void *arg, int jobnr, int threadnr), void *arg2, int *ret, int count);
2580 #if FF_API_THREAD_OPAQUE
2582 * @deprecated this field should not be used from outside of lavc
2584 attribute_deprecated
2585 void *thread_opaque;
2589 * noise vs. sse weight for the nsse comparsion function
2590 * - encoding: Set by user.
2591 * - decoding: unused
2597 * - encoding: Set by user.
2598 * - decoding: Set by libavcodec.
2601 #define FF_PROFILE_UNKNOWN -99
2602 #define FF_PROFILE_RESERVED -100
2604 #define FF_PROFILE_AAC_MAIN 0
2605 #define FF_PROFILE_AAC_LOW 1
2606 #define FF_PROFILE_AAC_SSR 2
2607 #define FF_PROFILE_AAC_LTP 3
2608 #define FF_PROFILE_AAC_HE 4
2609 #define FF_PROFILE_AAC_HE_V2 28
2610 #define FF_PROFILE_AAC_LD 22
2611 #define FF_PROFILE_AAC_ELD 38
2612 #define FF_PROFILE_MPEG2_AAC_LOW 128
2613 #define FF_PROFILE_MPEG2_AAC_HE 131
2615 #define FF_PROFILE_DTS 20
2616 #define FF_PROFILE_DTS_ES 30
2617 #define FF_PROFILE_DTS_96_24 40
2618 #define FF_PROFILE_DTS_HD_HRA 50
2619 #define FF_PROFILE_DTS_HD_MA 60
2621 #define FF_PROFILE_MPEG2_422 0
2622 #define FF_PROFILE_MPEG2_HIGH 1
2623 #define FF_PROFILE_MPEG2_SS 2
2624 #define FF_PROFILE_MPEG2_SNR_SCALABLE 3
2625 #define FF_PROFILE_MPEG2_MAIN 4
2626 #define FF_PROFILE_MPEG2_SIMPLE 5
2628 #define FF_PROFILE_H264_CONSTRAINED (1<<9) // 8+1; constraint_set1_flag
2629 #define FF_PROFILE_H264_INTRA (1<<11) // 8+3; constraint_set3_flag
2631 #define FF_PROFILE_H264_BASELINE 66
2632 #define FF_PROFILE_H264_CONSTRAINED_BASELINE (66|FF_PROFILE_H264_CONSTRAINED)
2633 #define FF_PROFILE_H264_MAIN 77
2634 #define FF_PROFILE_H264_EXTENDED 88
2635 #define FF_PROFILE_H264_HIGH 100
2636 #define FF_PROFILE_H264_HIGH_10 110
2637 #define FF_PROFILE_H264_HIGH_10_INTRA (110|FF_PROFILE_H264_INTRA)
2638 #define FF_PROFILE_H264_HIGH_422 122
2639 #define FF_PROFILE_H264_HIGH_422_INTRA (122|FF_PROFILE_H264_INTRA)
2640 #define FF_PROFILE_H264_HIGH_444 144
2641 #define FF_PROFILE_H264_HIGH_444_PREDICTIVE 244
2642 #define FF_PROFILE_H264_HIGH_444_INTRA (244|FF_PROFILE_H264_INTRA)
2643 #define FF_PROFILE_H264_CAVLC_444 44
2645 #define FF_PROFILE_VC1_SIMPLE 0
2646 #define FF_PROFILE_VC1_MAIN 1
2647 #define FF_PROFILE_VC1_COMPLEX 2
2648 #define FF_PROFILE_VC1_ADVANCED 3
2650 #define FF_PROFILE_MPEG4_SIMPLE 0
2651 #define FF_PROFILE_MPEG4_SIMPLE_SCALABLE 1
2652 #define FF_PROFILE_MPEG4_CORE 2
2653 #define FF_PROFILE_MPEG4_MAIN 3
2654 #define FF_PROFILE_MPEG4_N_BIT 4
2655 #define FF_PROFILE_MPEG4_SCALABLE_TEXTURE 5
2656 #define FF_PROFILE_MPEG4_SIMPLE_FACE_ANIMATION 6
2657 #define FF_PROFILE_MPEG4_BASIC_ANIMATED_TEXTURE 7
2658 #define FF_PROFILE_MPEG4_HYBRID 8
2659 #define FF_PROFILE_MPEG4_ADVANCED_REAL_TIME 9
2660 #define FF_PROFILE_MPEG4_CORE_SCALABLE 10
2661 #define FF_PROFILE_MPEG4_ADVANCED_CODING 11
2662 #define FF_PROFILE_MPEG4_ADVANCED_CORE 12
2663 #define FF_PROFILE_MPEG4_ADVANCED_SCALABLE_TEXTURE 13
2664 #define FF_PROFILE_MPEG4_SIMPLE_STUDIO 14
2665 #define FF_PROFILE_MPEG4_ADVANCED_SIMPLE 15
2667 #define FF_PROFILE_JPEG2000_CSTREAM_RESTRICTION_0 0
2668 #define FF_PROFILE_JPEG2000_CSTREAM_RESTRICTION_1 1
2669 #define FF_PROFILE_JPEG2000_CSTREAM_NO_RESTRICTION 2
2670 #define FF_PROFILE_JPEG2000_DCINEMA_2K 3
2671 #define FF_PROFILE_JPEG2000_DCINEMA_4K 4
2674 #define FF_PROFILE_HEVC_MAIN 1
2675 #define FF_PROFILE_HEVC_MAIN_10 2
2676 #define FF_PROFILE_HEVC_MAIN_STILL_PICTURE 3
2680 * - encoding: Set by user.
2681 * - decoding: Set by libavcodec.
2684 #define FF_LEVEL_UNKNOWN -99
2688 * - encoding: unused
2689 * - decoding: Set by user.
2691 enum AVDiscard skip_loop_filter;
2695 * - encoding: unused
2696 * - decoding: Set by user.
2698 enum AVDiscard skip_idct;
2702 * - encoding: unused
2703 * - decoding: Set by user.
2705 enum AVDiscard skip_frame;
2708 * Header containing style information for text subtitles.
2709 * For SUBTITLE_ASS subtitle type, it should contain the whole ASS
2710 * [Script Info] and [V4+ Styles] section, plus the [Events] line and
2711 * the Format line following. It shouldn't include any Dialogue line.
2712 * - encoding: Set/allocated/freed by user (before avcodec_open2())
2713 * - decoding: Set/allocated/freed by libavcodec (by avcodec_open2())
2715 uint8_t *subtitle_header;
2716 int subtitle_header_size;
2718 #if FF_API_ERROR_RATE
2720 * @deprecated use the 'error_rate' private AVOption of the mpegvideo
2723 attribute_deprecated
2727 #if FF_API_CODEC_PKT
2729 * @deprecated this field is not supposed to be accessed from outside lavc
2731 attribute_deprecated
2736 * VBV delay coded in the last frame (in periods of a 27 MHz clock).
2737 * Used for compliant TS muxing.
2738 * - encoding: Set by libavcodec.
2739 * - decoding: unused.
2747 typedef struct AVProfile {
2749 const char *name; ///< short name for the profile
2752 typedef struct AVCodecDefault AVCodecDefault;
2759 typedef struct AVCodec {
2761 * Name of the codec implementation.
2762 * The name is globally unique among encoders and among decoders (but an
2763 * encoder and a decoder can share the same name).
2764 * This is the primary way to find a codec from the user perspective.
2768 * Descriptive name for the codec, meant to be more human readable than name.
2769 * You should use the NULL_IF_CONFIG_SMALL() macro to define it.
2771 const char *long_name;
2772 enum AVMediaType type;
2775 * Codec capabilities.
2779 const AVRational *supported_framerates; ///< array of supported framerates, or NULL if any, array is terminated by {0,0}
2780 const enum AVPixelFormat *pix_fmts; ///< array of supported pixel formats, or NULL if unknown, array is terminated by -1
2781 const int *supported_samplerates; ///< array of supported audio samplerates, or NULL if unknown, array is terminated by 0
2782 const enum AVSampleFormat *sample_fmts; ///< array of supported sample formats, or NULL if unknown, array is terminated by -1
2783 const uint64_t *channel_layouts; ///< array of support channel layouts, or NULL if unknown. array is terminated by 0
2785 attribute_deprecated uint8_t max_lowres; ///< maximum value for lowres supported by the decoder
2787 const AVClass *priv_class; ///< AVClass for the private context
2788 const AVProfile *profiles; ///< array of recognized profiles, or NULL if unknown, array is terminated by {FF_PROFILE_UNKNOWN}
2790 /*****************************************************************
2791 * No fields below this line are part of the public API. They
2792 * may not be used outside of libavcodec and can be changed and
2794 * New public fields should be added right above.
2795 *****************************************************************
2798 struct AVCodec *next;
2800 * @name Frame-level threading support functions
2804 * If defined, called on thread contexts when they are created.
2805 * If the codec allocates writable tables in init(), re-allocate them here.
2806 * priv_data will be set to a copy of the original.
2808 int (*init_thread_copy)(AVCodecContext *);
2810 * Copy necessary context variables from a previous thread context to the current one.
2811 * If not defined, the next thread will start automatically; otherwise, the codec
2812 * must call ff_thread_finish_setup().
2814 * dst and src will (rarely) point to the same context, in which case memcpy should be skipped.
2816 int (*update_thread_context)(AVCodecContext *dst, const AVCodecContext *src);
2820 * Private codec-specific defaults.
2822 const AVCodecDefault *defaults;
2825 * Initialize codec static data, called from avcodec_register().
2827 void (*init_static_data)(struct AVCodec *codec);
2829 int (*init)(AVCodecContext *);
2830 int (*encode_sub)(AVCodecContext *, uint8_t *buf, int buf_size,
2831 const struct AVSubtitle *sub);
2833 * Encode data to an AVPacket.
2835 * @param avctx codec context
2836 * @param avpkt output AVPacket (may contain a user-provided buffer)
2837 * @param[in] frame AVFrame containing the raw data to be encoded
2838 * @param[out] got_packet_ptr encoder sets to 0 or 1 to indicate that a
2839 * non-empty packet was returned in avpkt.
2840 * @return 0 on success, negative error code on failure
2842 int (*encode2)(AVCodecContext *avctx, AVPacket *avpkt, const AVFrame *frame,
2843 int *got_packet_ptr);
2844 int (*decode)(AVCodecContext *, void *outdata, int *outdata_size, AVPacket *avpkt);
2845 int (*close)(AVCodecContext *);
2848 * Will be called when seeking
2850 void (*flush)(AVCodecContext *);
2856 typedef struct AVHWAccel {
2858 * Name of the hardware accelerated codec.
2859 * The name is globally unique among encoders and among decoders (but an
2860 * encoder and a decoder can share the same name).
2865 * Type of codec implemented by the hardware accelerator.
2867 * See AVMEDIA_TYPE_xxx
2869 enum AVMediaType type;
2872 * Codec implemented by the hardware accelerator.
2874 * See AV_CODEC_ID_xxx
2879 * Supported pixel format.
2881 * Only hardware accelerated formats are supported here.
2883 enum AVPixelFormat pix_fmt;
2886 * Hardware accelerated codec capabilities.
2887 * see FF_HWACCEL_CODEC_CAP_*
2891 struct AVHWAccel *next;
2894 * Called at the beginning of each frame or field picture.
2896 * Meaningful frame information (codec specific) is guaranteed to
2897 * be parsed at this point. This function is mandatory.
2899 * Note that buf can be NULL along with buf_size set to 0.
2900 * Otherwise, this means the whole frame is available at this point.
2902 * @param avctx the codec context
2903 * @param buf the frame data buffer base
2904 * @param buf_size the size of the frame in bytes
2905 * @return zero if successful, a negative value otherwise
2907 int (*start_frame)(AVCodecContext *avctx, const uint8_t *buf, uint32_t buf_size);
2910 * Callback for each slice.
2912 * Meaningful slice information (codec specific) is guaranteed to
2913 * be parsed at this point. This function is mandatory.
2915 * @param avctx the codec context
2916 * @param buf the slice data buffer base
2917 * @param buf_size the size of the slice in bytes
2918 * @return zero if successful, a negative value otherwise
2920 int (*decode_slice)(AVCodecContext *avctx, const uint8_t *buf, uint32_t buf_size);
2923 * Called at the end of each frame or field picture.
2925 * The whole picture is parsed at this point and can now be sent
2926 * to the hardware accelerator. This function is mandatory.
2928 * @param avctx the codec context
2929 * @return zero if successful, a negative value otherwise
2931 int (*end_frame)(AVCodecContext *avctx);
2934 * Size of HW accelerator private data.
2936 * Private data is allocated with av_mallocz() before
2937 * AVCodecContext.get_buffer() and deallocated after
2938 * AVCodecContext.release_buffer().
2944 * @defgroup lavc_picture AVPicture
2946 * Functions for working with AVPicture
2951 * four components are given, that's all.
2952 * the last component is alpha
2954 typedef struct AVPicture {
2955 uint8_t *data[AV_NUM_DATA_POINTERS];
2956 int linesize[AV_NUM_DATA_POINTERS]; ///< number of bytes per line
2963 #define AVPALETTE_SIZE 1024
2964 #define AVPALETTE_COUNT 256
2966 enum AVSubtitleType {
2969 SUBTITLE_BITMAP, ///< A bitmap, pict will be set
2972 * Plain text, the text field must be set by the decoder and is
2973 * authoritative. ass and pict fields may contain approximations.
2978 * Formatted text, the ass field must be set by the decoder and is
2979 * authoritative. pict and text fields may contain approximations.
2984 #define AV_SUBTITLE_FLAG_FORCED 0x00000001
2986 typedef struct AVSubtitleRect {
2987 int x; ///< top left corner of pict, undefined when pict is not set
2988 int y; ///< top left corner of pict, undefined when pict is not set
2989 int w; ///< width of pict, undefined when pict is not set
2990 int h; ///< height of pict, undefined when pict is not set
2991 int nb_colors; ///< number of colors in pict, undefined when pict is not set
2994 * data+linesize for the bitmap of this subtitle.
2995 * can be set for text/ass as well once they where rendered
2998 enum AVSubtitleType type;
3000 char *text; ///< 0 terminated plain UTF-8 text
3003 * 0 terminated ASS/SSA compatible event line.
3004 * The pressentation of this is unaffected by the other values in this
3011 typedef struct AVSubtitle {
3012 uint16_t format; /* 0 = graphics */
3013 uint32_t start_display_time; /* relative to packet pts, in ms */
3014 uint32_t end_display_time; /* relative to packet pts, in ms */
3016 AVSubtitleRect **rects;
3017 int64_t pts; ///< Same as packet pts, in AV_TIME_BASE
3021 * If c is NULL, returns the first registered codec,
3022 * if c is non-NULL, returns the next registered codec after c,
3023 * or NULL if c is the last one.
3025 AVCodec *av_codec_next(const AVCodec *c);
3028 * Return the LIBAVCODEC_VERSION_INT constant.
3030 unsigned avcodec_version(void);
3033 * Return the libavcodec build-time configuration.
3035 const char *avcodec_configuration(void);
3038 * Return the libavcodec license.
3040 const char *avcodec_license(void);
3043 * Register the codec codec and initialize libavcodec.
3045 * @warning either this function or avcodec_register_all() must be called
3046 * before any other libavcodec functions.
3048 * @see avcodec_register_all()
3050 void avcodec_register(AVCodec *codec);
3053 * Register all the codecs, parsers and bitstream filters which were enabled at
3054 * configuration time. If you do not call this function you can select exactly
3055 * which formats you want to support, by using the individual registration
3058 * @see avcodec_register
3059 * @see av_register_codec_parser
3060 * @see av_register_bitstream_filter
3062 void avcodec_register_all(void);
3065 * Allocate an AVCodecContext and set its fields to default values. The
3066 * resulting struct can be deallocated by calling avcodec_close() on it followed
3069 * @param codec if non-NULL, allocate private data and initialize defaults
3070 * for the given codec. It is illegal to then call avcodec_open2()
3071 * with a different codec.
3072 * If NULL, then the codec-specific defaults won't be initialized,
3073 * which may result in suboptimal default settings (this is
3074 * important mainly for encoders, e.g. libx264).
3076 * @return An AVCodecContext filled with default values or NULL on failure.
3077 * @see avcodec_get_context_defaults
3079 AVCodecContext *avcodec_alloc_context3(const AVCodec *codec);
3082 * Set the fields of the given AVCodecContext to default values corresponding
3083 * to the given codec (defaults may be codec-dependent).
3085 * Do not call this function if a non-NULL codec has been passed
3086 * to avcodec_alloc_context3() that allocated this AVCodecContext.
3087 * If codec is non-NULL, it is illegal to call avcodec_open2() with a
3088 * different codec on this AVCodecContext.
3090 int avcodec_get_context_defaults3(AVCodecContext *s, const AVCodec *codec);
3093 * Get the AVClass for AVCodecContext. It can be used in combination with
3094 * AV_OPT_SEARCH_FAKE_OBJ for examining options.
3096 * @see av_opt_find().
3098 const AVClass *avcodec_get_class(void);
3101 * Copy the settings of the source AVCodecContext into the destination
3102 * AVCodecContext. The resulting destination codec context will be
3103 * unopened, i.e. you are required to call avcodec_open2() before you
3104 * can use this AVCodecContext to decode/encode video/audio data.
3106 * @param dest target codec context, should be initialized with
3107 * avcodec_alloc_context3(), but otherwise uninitialized
3108 * @param src source codec context
3109 * @return AVERROR() on error (e.g. memory allocation error), 0 on success
3111 int avcodec_copy_context(AVCodecContext *dest, const AVCodecContext *src);
3113 #if FF_API_AVFRAME_LAVC
3115 * @deprecated use av_frame_alloc()
3117 attribute_deprecated
3118 AVFrame *avcodec_alloc_frame(void);
3121 * Set the fields of the given AVFrame to default values.
3123 * @param frame The AVFrame of which the fields should be set to default values.
3125 * @deprecated use av_frame_unref()
3127 attribute_deprecated
3128 void avcodec_get_frame_defaults(AVFrame *frame);
3131 * Free the frame and any dynamically allocated objects in it,
3132 * e.g. extended_data.
3134 * @param frame frame to be freed. The pointer will be set to NULL.
3136 * @warning this function does NOT free the data buffers themselves
3137 * (it does not know how, since they might have been allocated with
3138 * a custom get_buffer()).
3140 * @deprecated use av_frame_free()
3142 attribute_deprecated
3143 void avcodec_free_frame(AVFrame **frame);
3147 * Initialize the AVCodecContext to use the given AVCodec. Prior to using this
3148 * function the context has to be allocated with avcodec_alloc_context3().
3150 * The functions avcodec_find_decoder_by_name(), avcodec_find_encoder_by_name(),
3151 * avcodec_find_decoder() and avcodec_find_encoder() provide an easy way for
3152 * retrieving a codec.
3154 * @warning This function is not thread safe!
3157 * avcodec_register_all();
3158 * av_dict_set(&opts, "b", "2.5M", 0);
3159 * codec = avcodec_find_decoder(AV_CODEC_ID_H264);
3163 * context = avcodec_alloc_context3(codec);
3165 * if (avcodec_open2(context, codec, opts) < 0)
3169 * @param avctx The context to initialize.
3170 * @param codec The codec to open this context for. If a non-NULL codec has been
3171 * previously passed to avcodec_alloc_context3() or
3172 * avcodec_get_context_defaults3() for this context, then this
3173 * parameter MUST be either NULL or equal to the previously passed
3175 * @param options A dictionary filled with AVCodecContext and codec-private options.
3176 * On return this object will be filled with options that were not found.
3178 * @return zero on success, a negative value on error
3179 * @see avcodec_alloc_context3(), avcodec_find_decoder(), avcodec_find_encoder(),
3180 * av_dict_set(), av_opt_find().
3182 int avcodec_open2(AVCodecContext *avctx, const AVCodec *codec, AVDictionary **options);
3185 * Close a given AVCodecContext and free all the data associated with it
3186 * (but not the AVCodecContext itself).
3188 * Calling this function on an AVCodecContext that hasn't been opened will free
3189 * the codec-specific data allocated in avcodec_alloc_context3() /
3190 * avcodec_get_context_defaults3() with a non-NULL codec. Subsequent calls will
3193 int avcodec_close(AVCodecContext *avctx);
3196 * Free all allocated data in the given subtitle struct.
3198 * @param sub AVSubtitle to free.
3200 void avsubtitle_free(AVSubtitle *sub);
3207 * @addtogroup lavc_packet
3211 #if FF_API_DESTRUCT_PACKET
3213 * Default packet destructor.
3214 * @deprecated use the AVBuffer API instead
3216 attribute_deprecated
3217 void av_destruct_packet(AVPacket *pkt);
3221 * Initialize optional fields of a packet with default values.
3223 * Note, this does not touch the data and size members, which have to be
3224 * initialized separately.
3228 void av_init_packet(AVPacket *pkt);
3231 * Allocate the payload of a packet and initialize its fields with
3235 * @param size wanted payload size
3236 * @return 0 if OK, AVERROR_xxx otherwise
3238 int av_new_packet(AVPacket *pkt, int size);
3241 * Reduce packet size, correctly zeroing padding
3244 * @param size new size
3246 void av_shrink_packet(AVPacket *pkt, int size);
3249 * Increase packet size, correctly zeroing padding
3252 * @param grow_by number of bytes by which to increase the size of the packet
3254 int av_grow_packet(AVPacket *pkt, int grow_by);
3257 * Initialize a reference-counted packet from av_malloc()ed data.
3259 * @param pkt packet to be initialized. This function will set the data, size,
3260 * buf and destruct fields, all others are left untouched.
3261 * @param data Data allocated by av_malloc() to be used as packet data. If this
3262 * function returns successfully, the data is owned by the underlying AVBuffer.
3263 * The caller may not access the data through other means.
3264 * @param size size of data in bytes, without the padding. I.e. the full buffer
3265 * size is assumed to be size + FF_INPUT_BUFFER_PADDING_SIZE.
3267 * @return 0 on success, a negative AVERROR on error
3269 int av_packet_from_data(AVPacket *pkt, uint8_t *data, int size);
3272 * @warning This is a hack - the packet memory allocation stuff is broken. The
3273 * packet is allocated if it was not really allocated.
3275 int av_dup_packet(AVPacket *pkt);
3280 * @param pkt packet to free
3282 void av_free_packet(AVPacket *pkt);
3285 * Allocate new information of a packet.
3288 * @param type side information type
3289 * @param size side information size
3290 * @return pointer to fresh allocated data or NULL otherwise
3292 uint8_t* av_packet_new_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
3296 * Shrink the already allocated side data buffer
3299 * @param type side information type
3300 * @param size new side information size
3301 * @return 0 on success, < 0 on failure
3303 int av_packet_shrink_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
3307 * Get side information from packet.
3310 * @param type desired side information type
3311 * @param size pointer for side information size to store (optional)
3312 * @return pointer to data if present or NULL otherwise
3314 uint8_t* av_packet_get_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
3318 * Convenience function to free all the side data stored.
3319 * All the other fields stay untouched.
3323 void av_packet_free_side_data(AVPacket *pkt);
3326 * Setup a new reference to the data described by a given packet
3328 * If src is reference-counted, setup dst as a new reference to the
3329 * buffer in src. Otherwise allocate a new buffer in dst and copy the
3330 * data from src into it.
3332 * All the other fields are copied from src.
3334 * @see av_packet_unref
3336 * @param dst Destination packet
3337 * @param src Source packet
3339 * @return 0 on success, a negative AVERROR on error.
3341 int av_packet_ref(AVPacket *dst, AVPacket *src);
3346 * Unreference the buffer referenced by the packet and reset the
3347 * remaining packet fields to their default values.
3349 * @param pkt The packet to be unreferenced.
3351 void av_packet_unref(AVPacket *pkt);
3354 * Move every field in src to dst and reset src.
3356 * @see av_packet_unref
3358 * @param src Source packet, will be reset
3359 * @param dst Destination packet
3361 void av_packet_move_ref(AVPacket *dst, AVPacket *src);
3364 * Copy only "properties" fields from src to dst.
3366 * Properties for the purpose of this function are all the fields
3367 * beside those related to the packet data (buf, data, size)
3369 * @param dst Destination packet
3370 * @param src Source packet
3372 * @return 0 on success AVERROR on failure.
3375 int av_packet_copy_props(AVPacket *dst, const AVPacket *src);
3382 * @addtogroup lavc_decoding
3387 * Find a registered decoder with a matching codec ID.
3389 * @param id AVCodecID of the requested decoder
3390 * @return A decoder if one was found, NULL otherwise.
3392 AVCodec *avcodec_find_decoder(enum AVCodecID id);
3395 * Find a registered decoder with the specified name.
3397 * @param name name of the requested decoder
3398 * @return A decoder if one was found, NULL otherwise.
3400 AVCodec *avcodec_find_decoder_by_name(const char *name);
3402 #if FF_API_GET_BUFFER
3403 attribute_deprecated int avcodec_default_get_buffer(AVCodecContext *s, AVFrame *pic);
3404 attribute_deprecated void avcodec_default_release_buffer(AVCodecContext *s, AVFrame *pic);
3405 attribute_deprecated int avcodec_default_reget_buffer(AVCodecContext *s, AVFrame *pic);
3409 * The default callback for AVCodecContext.get_buffer2(). It is made public so
3410 * it can be called by custom get_buffer2() implementations for decoders without
3411 * CODEC_CAP_DR1 set.
3413 int avcodec_default_get_buffer2(AVCodecContext *s, AVFrame *frame, int flags);
3417 * Return the amount of padding in pixels which the get_buffer callback must
3418 * provide around the edge of the image for codecs which do not have the
3419 * CODEC_FLAG_EMU_EDGE flag.
3421 * @return Required padding in pixels.
3423 * @deprecated CODEC_FLAG_EMU_EDGE is deprecated, so this function is no longer
3426 attribute_deprecated
3427 unsigned avcodec_get_edge_width(void);
3431 * Modify width and height values so that they will result in a memory
3432 * buffer that is acceptable for the codec if you do not use any horizontal
3435 * May only be used if a codec with CODEC_CAP_DR1 has been opened.
3437 void avcodec_align_dimensions(AVCodecContext *s, int *width, int *height);
3440 * Modify width and height values so that they will result in a memory
3441 * buffer that is acceptable for the codec if you also ensure that all
3442 * line sizes are a multiple of the respective linesize_align[i].
3444 * May only be used if a codec with CODEC_CAP_DR1 has been opened.
3446 void avcodec_align_dimensions2(AVCodecContext *s, int *width, int *height,
3447 int linesize_align[AV_NUM_DATA_POINTERS]);
3450 * Decode the audio frame of size avpkt->size from avpkt->data into frame.
3452 * Some decoders may support multiple frames in a single AVPacket. Such
3453 * decoders would then just decode the first frame and the return value would be
3454 * less than the packet size. In this case, avcodec_decode_audio4 has to be
3455 * called again with an AVPacket containing the remaining data in order to
3456 * decode the second frame, etc... Even if no frames are returned, the packet
3457 * needs to be fed to the decoder with remaining data until it is completely
3458 * consumed or an error occurs.
3460 * Some decoders (those marked with CODEC_CAP_DELAY) have a delay between input
3461 * and output. This means that for some packets they will not immediately
3462 * produce decoded output and need to be flushed at the end of decoding to get
3463 * all the decoded data. Flushing is done by calling this function with packets
3464 * with avpkt->data set to NULL and avpkt->size set to 0 until it stops
3465 * returning samples. It is safe to flush even those decoders that are not
3466 * marked with CODEC_CAP_DELAY, then no samples will be returned.
3468 * @warning The input buffer, avpkt->data must be FF_INPUT_BUFFER_PADDING_SIZE
3469 * larger than the actual read bytes because some optimized bitstream
3470 * readers read 32 or 64 bits at once and could read over the end.
3472 * @param avctx the codec context
3473 * @param[out] frame The AVFrame in which to store decoded audio samples.
3474 * The decoder will allocate a buffer for the decoded frame by
3475 * calling the AVCodecContext.get_buffer2() callback.
3476 * When AVCodecContext.refcounted_frames is set to 1, the frame is
3477 * reference counted and the returned reference belongs to the
3478 * caller. The caller must release the frame using av_frame_unref()
3479 * when the frame is no longer needed. The caller may safely write
3480 * to the frame if av_frame_is_writable() returns 1.
3481 * When AVCodecContext.refcounted_frames is set to 0, the returned
3482 * reference belongs to the decoder and is valid only until the
3483 * next call to this function or until closing or flushing the
3484 * decoder. The caller may not write to it.
3485 * @param[out] got_frame_ptr Zero if no frame could be decoded, otherwise it is
3486 * non-zero. Note that this field being set to zero
3487 * does not mean that an error has occurred. For
3488 * decoders with CODEC_CAP_DELAY set, no given decode
3489 * call is guaranteed to produce a frame.
3490 * @param[in] avpkt The input AVPacket containing the input buffer.
3491 * At least avpkt->data and avpkt->size should be set. Some
3492 * decoders might also require additional fields to be set.
3493 * @return A negative error code is returned if an error occurred during
3494 * decoding, otherwise the number of bytes consumed from the input
3495 * AVPacket is returned.
3497 int avcodec_decode_audio4(AVCodecContext *avctx, AVFrame *frame,
3498 int *got_frame_ptr, AVPacket *avpkt);
3501 * Decode the video frame of size avpkt->size from avpkt->data into picture.
3502 * Some decoders may support multiple frames in a single AVPacket, such
3503 * decoders would then just decode the first frame.
3505 * @warning The input buffer must be FF_INPUT_BUFFER_PADDING_SIZE larger than
3506 * the actual read bytes because some optimized bitstream readers read 32 or 64
3507 * bits at once and could read over the end.
3509 * @warning The end of the input buffer buf should be set to 0 to ensure that
3510 * no overreading happens for damaged MPEG streams.
3512 * @note Codecs which have the CODEC_CAP_DELAY capability set have a delay
3513 * between input and output, these need to be fed with avpkt->data=NULL,
3514 * avpkt->size=0 at the end to return the remaining frames.
3516 * @param avctx the codec context
3517 * @param[out] picture The AVFrame in which the decoded video frame will be stored.
3518 * Use av_frame_alloc() to get an AVFrame. The codec will
3519 * allocate memory for the actual bitmap by calling the
3520 * AVCodecContext.get_buffer2() callback.
3521 * When AVCodecContext.refcounted_frames is set to 1, the frame is
3522 * reference counted and the returned reference belongs to the
3523 * caller. The caller must release the frame using av_frame_unref()
3524 * when the frame is no longer needed. The caller may safely write
3525 * to the frame if av_frame_is_writable() returns 1.
3526 * When AVCodecContext.refcounted_frames is set to 0, the returned
3527 * reference belongs to the decoder and is valid only until the
3528 * next call to this function or until closing or flushing the
3529 * decoder. The caller may not write to it.
3531 * @param[in] avpkt The input AVpacket containing the input buffer.
3532 * You can create such packet with av_init_packet() and by then setting
3533 * data and size, some decoders might in addition need other fields like
3534 * flags&AV_PKT_FLAG_KEY. All decoders are designed to use the least
3536 * @param[in,out] got_picture_ptr Zero if no frame could be decompressed, otherwise, it is nonzero.
3537 * @return On error a negative value is returned, otherwise the number of bytes
3538 * used or zero if no frame could be decompressed.
3540 int avcodec_decode_video2(AVCodecContext *avctx, AVFrame *picture,
3541 int *got_picture_ptr,
3545 * Decode a subtitle message.
3546 * Return a negative value on error, otherwise return the number of bytes used.
3547 * If no subtitle could be decompressed, got_sub_ptr is zero.
3548 * Otherwise, the subtitle is stored in *sub.
3549 * Note that CODEC_CAP_DR1 is not available for subtitle codecs. This is for
3550 * simplicity, because the performance difference is expect to be negligible
3551 * and reusing a get_buffer written for video codecs would probably perform badly
3552 * due to a potentially very different allocation pattern.
3554 * @param avctx the codec context
3555 * @param[out] sub The AVSubtitle in which the decoded subtitle will be stored, must be
3556 freed with avsubtitle_free if *got_sub_ptr is set.
3557 * @param[in,out] got_sub_ptr Zero if no subtitle could be decompressed, otherwise, it is nonzero.
3558 * @param[in] avpkt The input AVPacket containing the input buffer.
3560 int avcodec_decode_subtitle2(AVCodecContext *avctx, AVSubtitle *sub,
3565 * @defgroup lavc_parsing Frame parsing
3569 enum AVPictureStructure {
3570 AV_PICTURE_STRUCTURE_UNKNOWN, //< unknown
3571 AV_PICTURE_STRUCTURE_TOP_FIELD, //< coded as top field
3572 AV_PICTURE_STRUCTURE_BOTTOM_FIELD, //< coded as bottom field
3573 AV_PICTURE_STRUCTURE_FRAME, //< coded as frame
3576 typedef struct AVCodecParserContext {
3578 struct AVCodecParser *parser;
3579 int64_t frame_offset; /* offset of the current frame */
3580 int64_t cur_offset; /* current offset
3581 (incremented by each av_parser_parse()) */
3582 int64_t next_frame_offset; /* offset of the next frame */
3584 int pict_type; /* XXX: Put it back in AVCodecContext. */
3586 * This field is used for proper frame duration computation in lavf.
3587 * It signals, how much longer the frame duration of the current frame
3588 * is compared to normal frame duration.
3590 * frame_duration = (1 + repeat_pict) * time_base
3592 * It is used by codecs like H.264 to display telecined material.
3594 int repeat_pict; /* XXX: Put it back in AVCodecContext. */
3595 int64_t pts; /* pts of the current frame */
3596 int64_t dts; /* dts of the current frame */
3601 int fetch_timestamp;
3603 #define AV_PARSER_PTS_NB 4
3604 int cur_frame_start_index;
3605 int64_t cur_frame_offset[AV_PARSER_PTS_NB];
3606 int64_t cur_frame_pts[AV_PARSER_PTS_NB];
3607 int64_t cur_frame_dts[AV_PARSER_PTS_NB];
3610 #define PARSER_FLAG_COMPLETE_FRAMES 0x0001
3611 #define PARSER_FLAG_ONCE 0x0002
3612 /// Set if the parser has a valid file offset
3613 #define PARSER_FLAG_FETCHED_OFFSET 0x0004
3615 int64_t offset; ///< byte offset from starting packet start
3616 int64_t cur_frame_end[AV_PARSER_PTS_NB];
3619 * Set by parser to 1 for key frames and 0 for non-key frames.
3620 * It is initialized to -1, so if the parser doesn't set this flag,
3621 * old-style fallback using AV_PICTURE_TYPE_I picture type as key frames
3627 * Time difference in stream time base units from the pts of this
3628 * packet to the point at which the output from the decoder has converged
3629 * independent from the availability of previous frames. That is, the
3630 * frames are virtually identical no matter if decoding started from
3631 * the very first frame or from this keyframe.
3632 * Is AV_NOPTS_VALUE if unknown.
3633 * This field is not the display duration of the current frame.
3634 * This field has no meaning if the packet does not have AV_PKT_FLAG_KEY
3637 * The purpose of this field is to allow seeking in streams that have no
3638 * keyframes in the conventional sense. It corresponds to the
3639 * recovery point SEI in H.264 and match_time_delta in NUT. It is also
3640 * essential for some types of subtitle streams to ensure that all
3641 * subtitles are correctly displayed after seeking.
3643 int64_t convergence_duration;
3645 // Timestamp generation support:
3647 * Synchronization point for start of timestamp generation.
3649 * Set to >0 for sync point, 0 for no sync point and <0 for undefined
3652 * For example, this corresponds to presence of H.264 buffering period
3658 * Offset of the current timestamp against last timestamp sync point in
3659 * units of AVCodecContext.time_base.
3661 * Set to INT_MIN when dts_sync_point unused. Otherwise, it must
3662 * contain a valid timestamp offset.
3664 * Note that the timestamp of sync point has usually a nonzero
3665 * dts_ref_dts_delta, which refers to the previous sync point. Offset of
3666 * the next frame after timestamp sync point will be usually 1.
3668 * For example, this corresponds to H.264 cpb_removal_delay.
3670 int dts_ref_dts_delta;
3673 * Presentation delay of current frame in units of AVCodecContext.time_base.
3675 * Set to INT_MIN when dts_sync_point unused. Otherwise, it must
3676 * contain valid non-negative timestamp delta (presentation time of a frame
3677 * must not lie in the past).
3679 * This delay represents the difference between decoding and presentation
3680 * time of the frame.
3682 * For example, this corresponds to H.264 dpb_output_delay.
3687 * Position of the packet in file.
3689 * Analogous to cur_frame_pts/dts
3691 int64_t cur_frame_pos[AV_PARSER_PTS_NB];
3694 * Byte position of currently parsed frame in stream.
3699 * Previous frame byte position.
3704 * Duration of the current frame.
3705 * For audio, this is in units of 1 / AVCodecContext.sample_rate.
3706 * For all other types, this is in units of AVCodecContext.time_base.
3710 enum AVFieldOrder field_order;
3713 * Indicate whether a picture is coded as a frame, top field or bottom field.
3715 * For example, H.264 field_pic_flag equal to 0 corresponds to
3716 * AV_PICTURE_STRUCTURE_FRAME. An H.264 picture with field_pic_flag
3717 * equal to 1 and bottom_field_flag equal to 0 corresponds to
3718 * AV_PICTURE_STRUCTURE_TOP_FIELD.
3720 enum AVPictureStructure picture_structure;
3723 * Picture number incremented in presentation or output order.
3724 * This field may be reinitialized at the first picture of a new sequence.
3726 * For example, this corresponds to H.264 PicOrderCnt.
3728 int output_picture_number;
3729 } AVCodecParserContext;
3731 typedef struct AVCodecParser {
3732 int codec_ids[5]; /* several codec IDs are permitted */
3734 int (*parser_init)(AVCodecParserContext *s);
3735 int (*parser_parse)(AVCodecParserContext *s,
3736 AVCodecContext *avctx,
3737 const uint8_t **poutbuf, int *poutbuf_size,
3738 const uint8_t *buf, int buf_size);
3739 void (*parser_close)(AVCodecParserContext *s);
3740 int (*split)(AVCodecContext *avctx, const uint8_t *buf, int buf_size);
3741 struct AVCodecParser *next;
3744 AVCodecParser *av_parser_next(AVCodecParser *c);
3746 void av_register_codec_parser(AVCodecParser *parser);
3747 AVCodecParserContext *av_parser_init(int codec_id);
3752 * @param s parser context.
3753 * @param avctx codec context.
3754 * @param poutbuf set to pointer to parsed buffer or NULL if not yet finished.
3755 * @param poutbuf_size set to size of parsed buffer or zero if not yet finished.
3756 * @param buf input buffer.
3757 * @param buf_size input length, to signal EOF, this should be 0 (so that the last frame can be output).
3758 * @param pts input presentation timestamp.
3759 * @param dts input decoding timestamp.
3760 * @param pos input byte position in stream.
3761 * @return the number of bytes of the input bitstream used.
3766 * len = av_parser_parse2(myparser, AVCodecContext, &data, &size,
3773 * decode_frame(data, size);
3777 int av_parser_parse2(AVCodecParserContext *s,
3778 AVCodecContext *avctx,
3779 uint8_t **poutbuf, int *poutbuf_size,
3780 const uint8_t *buf, int buf_size,
3781 int64_t pts, int64_t dts,
3785 * @return 0 if the output buffer is a subset of the input, 1 if it is allocated and must be freed
3786 * @deprecated use AVBitstreamFilter
3788 int av_parser_change(AVCodecParserContext *s,
3789 AVCodecContext *avctx,
3790 uint8_t **poutbuf, int *poutbuf_size,
3791 const uint8_t *buf, int buf_size, int keyframe);
3792 void av_parser_close(AVCodecParserContext *s);
3800 * @addtogroup lavc_encoding
3805 * Find a registered encoder with a matching codec ID.
3807 * @param id AVCodecID of the requested encoder
3808 * @return An encoder if one was found, NULL otherwise.
3810 AVCodec *avcodec_find_encoder(enum AVCodecID id);
3813 * Find a registered encoder with the specified name.
3815 * @param name name of the requested encoder
3816 * @return An encoder if one was found, NULL otherwise.
3818 AVCodec *avcodec_find_encoder_by_name(const char *name);
3821 * Encode a frame of audio.
3823 * Takes input samples from frame and writes the next output packet, if
3824 * available, to avpkt. The output packet does not necessarily contain data for
3825 * the most recent frame, as encoders can delay, split, and combine input frames
3826 * internally as needed.
3828 * @param avctx codec context
3829 * @param avpkt output AVPacket.
3830 * The user can supply an output buffer by setting
3831 * avpkt->data and avpkt->size prior to calling the
3832 * function, but if the size of the user-provided data is not
3833 * large enough, encoding will fail. All other AVPacket fields
3834 * will be reset by the encoder using av_init_packet(). If
3835 * avpkt->data is NULL, the encoder will allocate it.
3836 * The encoder will set avpkt->size to the size of the
3839 * If this function fails or produces no output, avpkt will be
3840 * freed using av_free_packet() (i.e. avpkt->destruct will be
3841 * called to free the user supplied buffer).
3842 * @param[in] frame AVFrame containing the raw audio data to be encoded.
3843 * May be NULL when flushing an encoder that has the
3844 * CODEC_CAP_DELAY capability set.
3845 * If CODEC_CAP_VARIABLE_FRAME_SIZE is set, then each frame
3846 * can have any number of samples.
3847 * If it is not set, frame->nb_samples must be equal to
3848 * avctx->frame_size for all frames except the last.
3849 * The final frame may be smaller than avctx->frame_size.
3850 * @param[out] got_packet_ptr This field is set to 1 by libavcodec if the
3851 * output packet is non-empty, and to 0 if it is
3852 * empty. If the function returns an error, the
3853 * packet can be assumed to be invalid, and the
3854 * value of got_packet_ptr is undefined and should
3856 * @return 0 on success, negative error code on failure
3858 int avcodec_encode_audio2(AVCodecContext *avctx, AVPacket *avpkt,
3859 const AVFrame *frame, int *got_packet_ptr);
3862 * Encode a frame of video.
3864 * Takes input raw video data from frame and writes the next output packet, if
3865 * available, to avpkt. The output packet does not necessarily contain data for
3866 * the most recent frame, as encoders can delay and reorder input frames
3867 * internally as needed.
3869 * @param avctx codec context
3870 * @param avpkt output AVPacket.
3871 * The user can supply an output buffer by setting
3872 * avpkt->data and avpkt->size prior to calling the
3873 * function, but if the size of the user-provided data is not
3874 * large enough, encoding will fail. All other AVPacket fields
3875 * will be reset by the encoder using av_init_packet(). If
3876 * avpkt->data is NULL, the encoder will allocate it.
3877 * The encoder will set avpkt->size to the size of the
3878 * output packet. The returned data (if any) belongs to the
3879 * caller, he is responsible for freeing it.
3881 * If this function fails or produces no output, avpkt will be
3882 * freed using av_free_packet() (i.e. avpkt->destruct will be
3883 * called to free the user supplied buffer).
3884 * @param[in] frame AVFrame containing the raw video data to be encoded.
3885 * May be NULL when flushing an encoder that has the
3886 * CODEC_CAP_DELAY capability set.
3887 * @param[out] got_packet_ptr This field is set to 1 by libavcodec if the
3888 * output packet is non-empty, and to 0 if it is
3889 * empty. If the function returns an error, the
3890 * packet can be assumed to be invalid, and the
3891 * value of got_packet_ptr is undefined and should
3893 * @return 0 on success, negative error code on failure
3895 int avcodec_encode_video2(AVCodecContext *avctx, AVPacket *avpkt,
3896 const AVFrame *frame, int *got_packet_ptr);
3898 int avcodec_encode_subtitle(AVCodecContext *avctx, uint8_t *buf, int buf_size,
3899 const AVSubtitle *sub);
3907 * @addtogroup lavc_picture
3912 * Allocate memory for a picture. Call avpicture_free() to free it.
3914 * @see avpicture_fill()
3916 * @param picture the picture to be filled in
3917 * @param pix_fmt the format of the picture
3918 * @param width the width of the picture
3919 * @param height the height of the picture
3920 * @return zero if successful, a negative value if not
3922 int avpicture_alloc(AVPicture *picture, enum AVPixelFormat pix_fmt, int width, int height);
3925 * Free a picture previously allocated by avpicture_alloc().
3926 * The data buffer used by the AVPicture is freed, but the AVPicture structure
3929 * @param picture the AVPicture to be freed
3931 void avpicture_free(AVPicture *picture);
3934 * Fill in the AVPicture fields.
3935 * The fields of the given AVPicture are filled in by using the 'ptr' address
3936 * which points to the image data buffer. Depending on the specified picture
3937 * format, one or multiple image data pointers and line sizes will be set.
3938 * If a planar format is specified, several pointers will be set pointing to
3939 * the different picture planes and the line sizes of the different planes
3940 * will be stored in the lines_sizes array.
3941 * Call with ptr == NULL to get the required size for the ptr buffer.
3943 * To allocate the buffer and fill in the AVPicture fields in one call,
3944 * use avpicture_alloc().
3946 * @param picture AVPicture whose fields are to be filled in
3947 * @param ptr Buffer which will contain or contains the actual image data
3948 * @param pix_fmt The format in which the picture data is stored.
3949 * @param width the width of the image in pixels
3950 * @param height the height of the image in pixels
3951 * @return size of the image data in bytes
3953 int avpicture_fill(AVPicture *picture, uint8_t *ptr,
3954 enum AVPixelFormat pix_fmt, int width, int height);
3957 * Copy pixel data from an AVPicture into a buffer.
3958 * The data is stored compactly, without any gaps for alignment or padding
3959 * which may be applied by avpicture_fill().
3961 * @see avpicture_get_size()
3963 * @param[in] src AVPicture containing image data
3964 * @param[in] pix_fmt The format in which the picture data is stored.
3965 * @param[in] width the width of the image in pixels.
3966 * @param[in] height the height of the image in pixels.
3967 * @param[out] dest A buffer into which picture data will be copied.
3968 * @param[in] dest_size The size of 'dest'.
3969 * @return The number of bytes written to dest, or a negative value (error code) on error.
3971 int avpicture_layout(const AVPicture* src, enum AVPixelFormat pix_fmt,
3972 int width, int height,
3973 unsigned char *dest, int dest_size);
3976 * Calculate the size in bytes that a picture of the given width and height
3977 * would occupy if stored in the given picture format.
3978 * Note that this returns the size of a compact representation as generated
3979 * by avpicture_layout(), which can be smaller than the size required for e.g.
3982 * @param pix_fmt the given picture format
3983 * @param width the width of the image
3984 * @param height the height of the image
3985 * @return Image data size in bytes or -1 on error (e.g. too large dimensions).
3987 int avpicture_get_size(enum AVPixelFormat pix_fmt, int width, int height);
3989 #if FF_API_DEINTERLACE
3991 * deinterlace - if not supported return -1
3993 * @deprecated - use yadif (in libavfilter) instead
3995 attribute_deprecated
3996 int avpicture_deinterlace(AVPicture *dst, const AVPicture *src,
3997 enum AVPixelFormat pix_fmt, int width, int height);
4000 * Copy image src to dst. Wraps av_picture_data_copy() above.
4002 void av_picture_copy(AVPicture *dst, const AVPicture *src,
4003 enum AVPixelFormat pix_fmt, int width, int height);
4006 * Crop image top and left side.
4008 int av_picture_crop(AVPicture *dst, const AVPicture *src,
4009 enum AVPixelFormat pix_fmt, int top_band, int left_band);
4014 int av_picture_pad(AVPicture *dst, const AVPicture *src, int height, int width, enum AVPixelFormat pix_fmt,
4015 int padtop, int padbottom, int padleft, int padright, int *color);
4022 * @defgroup lavc_misc Utility functions
4025 * Miscellaneous utility functions related to both encoding and decoding
4031 * @defgroup lavc_misc_pixfmt Pixel formats
4033 * Functions for working with pixel formats.
4038 * @deprecated Use av_pix_fmt_get_chroma_sub_sample
4041 void attribute_deprecated avcodec_get_chroma_sub_sample(enum AVPixelFormat pix_fmt, int *h_shift, int *v_shift);
4044 * Return a value representing the fourCC code associated to the
4045 * pixel format pix_fmt, or 0 if no associated fourCC code can be
4048 unsigned int avcodec_pix_fmt_to_codec_tag(enum AVPixelFormat pix_fmt);
4050 #define FF_LOSS_RESOLUTION 0x0001 /**< loss due to resolution change */
4051 #define FF_LOSS_DEPTH 0x0002 /**< loss due to color depth change */
4052 #define FF_LOSS_COLORSPACE 0x0004 /**< loss due to color space conversion */
4053 #define FF_LOSS_ALPHA 0x0008 /**< loss of alpha bits */
4054 #define FF_LOSS_COLORQUANT 0x0010 /**< loss due to color quantization */
4055 #define FF_LOSS_CHROMA 0x0020 /**< loss of chroma (e.g. RGB to gray conversion) */
4058 * Compute what kind of losses will occur when converting from one specific
4059 * pixel format to another.
4060 * When converting from one pixel format to another, information loss may occur.
4061 * For example, when converting from RGB24 to GRAY, the color information will
4062 * be lost. Similarly, other losses occur when converting from some formats to
4063 * other formats. These losses can involve loss of chroma, but also loss of
4064 * resolution, loss of color depth, loss due to the color space conversion, loss
4065 * of the alpha bits or loss due to color quantization.
4066 * avcodec_get_fix_fmt_loss() informs you about the various types of losses
4067 * which will occur when converting from one pixel format to another.
4069 * @param[in] dst_pix_fmt destination pixel format
4070 * @param[in] src_pix_fmt source pixel format
4071 * @param[in] has_alpha Whether the source pixel format alpha channel is used.
4072 * @return Combination of flags informing you what kind of losses will occur.
4074 int avcodec_get_pix_fmt_loss(enum AVPixelFormat dst_pix_fmt, enum AVPixelFormat src_pix_fmt,
4078 * Find the best pixel format to convert to given a certain source pixel
4079 * format. When converting from one pixel format to another, information loss
4080 * may occur. For example, when converting from RGB24 to GRAY, the color
4081 * information will be lost. Similarly, other losses occur when converting from
4082 * some formats to other formats. avcodec_find_best_pix_fmt2() searches which of
4083 * the given pixel formats should be used to suffer the least amount of loss.
4084 * The pixel formats from which it chooses one, are determined by the
4085 * pix_fmt_list parameter.
4088 * @param[in] pix_fmt_list AV_PIX_FMT_NONE terminated array of pixel formats to choose from
4089 * @param[in] src_pix_fmt source pixel format
4090 * @param[in] has_alpha Whether the source pixel format alpha channel is used.
4091 * @param[out] loss_ptr Combination of flags informing you what kind of losses will occur.
4092 * @return The best pixel format to convert to or -1 if none was found.
4094 enum AVPixelFormat avcodec_find_best_pix_fmt2(enum AVPixelFormat *pix_fmt_list,
4095 enum AVPixelFormat src_pix_fmt,
4096 int has_alpha, int *loss_ptr);
4098 enum AVPixelFormat avcodec_default_get_format(struct AVCodecContext *s, const enum AVPixelFormat * fmt);
4104 #if FF_API_SET_DIMENSIONS
4106 * @deprecated this function is not supposed to be used from outside of lavc
4108 attribute_deprecated
4109 void avcodec_set_dimensions(AVCodecContext *s, int width, int height);
4113 * Put a string representing the codec tag codec_tag in buf.
4115 * @param buf buffer to place codec tag in
4116 * @param buf_size size in bytes of buf
4117 * @param codec_tag codec tag to assign
4118 * @return the length of the string that would have been generated if
4119 * enough space had been available, excluding the trailing null
4121 size_t av_get_codec_tag_string(char *buf, size_t buf_size, unsigned int codec_tag);
4123 void avcodec_string(char *buf, int buf_size, AVCodecContext *enc, int encode);
4126 * Return a name for the specified profile, if available.
4128 * @param codec the codec that is searched for the given profile
4129 * @param profile the profile value for which a name is requested
4130 * @return A name for the profile if found, NULL otherwise.
4132 const char *av_get_profile_name(const AVCodec *codec, int profile);
4134 int avcodec_default_execute(AVCodecContext *c, int (*func)(AVCodecContext *c2, void *arg2),void *arg, int *ret, int count, int size);
4135 int avcodec_default_execute2(AVCodecContext *c, int (*func)(AVCodecContext *c2, void *arg2, int, int),void *arg, int *ret, int count);
4136 //FIXME func typedef
4139 * Fill audio frame data and linesize.
4140 * AVFrame extended_data channel pointers are allocated if necessary for
4143 * @param frame the AVFrame
4144 * frame->nb_samples must be set prior to calling the
4145 * function. This function fills in frame->data,
4146 * frame->extended_data, frame->linesize[0].
4147 * @param nb_channels channel count
4148 * @param sample_fmt sample format
4149 * @param buf buffer to use for frame data
4150 * @param buf_size size of buffer
4151 * @param align plane size sample alignment (0 = default)
4152 * @return 0 on success, negative error code on failure
4154 int avcodec_fill_audio_frame(AVFrame *frame, int nb_channels,
4155 enum AVSampleFormat sample_fmt, const uint8_t *buf,
4156 int buf_size, int align);
4159 * Reset the internal decoder state / flush internal buffers. Should be called
4160 * e.g. when seeking or when switching to a different stream.
4162 * @note when refcounted frames are not used (i.e. avctx->refcounted_frames is 0),
4163 * this invalidates the frames previously returned from the decoder. When
4164 * refcounted frames are used, the decoder just releases any references it might
4165 * keep internally, but the caller's reference remains valid.
4167 void avcodec_flush_buffers(AVCodecContext *avctx);
4170 * Return codec bits per sample.
4172 * @param[in] codec_id the codec
4173 * @return Number of bits per sample or zero if unknown for the given codec.
4175 int av_get_bits_per_sample(enum AVCodecID codec_id);
4178 * Return codec bits per sample.
4179 * Only return non-zero if the bits per sample is exactly correct, not an
4182 * @param[in] codec_id the codec
4183 * @return Number of bits per sample or zero if unknown for the given codec.
4185 int av_get_exact_bits_per_sample(enum AVCodecID codec_id);
4188 * Return audio frame duration.
4190 * @param avctx codec context
4191 * @param frame_bytes size of the frame, or 0 if unknown
4192 * @return frame duration, in samples, if known. 0 if not able to
4195 int av_get_audio_frame_duration(AVCodecContext *avctx, int frame_bytes);
4198 typedef struct AVBitStreamFilterContext {
4200 struct AVBitStreamFilter *filter;
4201 AVCodecParserContext *parser;
4202 struct AVBitStreamFilterContext *next;
4203 } AVBitStreamFilterContext;
4206 typedef struct AVBitStreamFilter {
4209 int (*filter)(AVBitStreamFilterContext *bsfc,
4210 AVCodecContext *avctx, const char *args,
4211 uint8_t **poutbuf, int *poutbuf_size,
4212 const uint8_t *buf, int buf_size, int keyframe);
4213 void (*close)(AVBitStreamFilterContext *bsfc);
4214 struct AVBitStreamFilter *next;
4215 } AVBitStreamFilter;
4217 void av_register_bitstream_filter(AVBitStreamFilter *bsf);
4218 AVBitStreamFilterContext *av_bitstream_filter_init(const char *name);
4219 int av_bitstream_filter_filter(AVBitStreamFilterContext *bsfc,
4220 AVCodecContext *avctx, const char *args,
4221 uint8_t **poutbuf, int *poutbuf_size,
4222 const uint8_t *buf, int buf_size, int keyframe);
4223 void av_bitstream_filter_close(AVBitStreamFilterContext *bsf);
4225 AVBitStreamFilter *av_bitstream_filter_next(AVBitStreamFilter *f);
4230 * Allocate a buffer with padding, reusing the given one if large enough.
4232 * Same behaviour av_fast_malloc but the buffer has additional
4233 * FF_INPUT_PADDING_SIZE at the end which will always memset to 0.
4236 void av_fast_padded_malloc(void *ptr, unsigned int *size, size_t min_size);
4239 * Encode extradata length to a buffer. Used by xiph codecs.
4241 * @param s buffer to write to; must be at least (v/255+1) bytes long
4242 * @param v size of extradata in bytes
4243 * @return number of bytes written to the buffer.
4245 unsigned int av_xiphlacing(unsigned char *s, unsigned int v);
4247 #if FF_API_MISSING_SAMPLE
4249 * Log a generic warning message about a missing feature. This function is
4250 * intended to be used internally by Libav (libavcodec, libavformat, etc.)
4251 * only, and would normally not be used by applications.
4252 * @param[in] avc a pointer to an arbitrary struct of which the first field is
4253 * a pointer to an AVClass struct
4254 * @param[in] feature string containing the name of the missing feature
4255 * @param[in] want_sample indicates if samples are wanted which exhibit this feature.
4256 * If want_sample is non-zero, additional verbage will be added to the log
4257 * message which tells the user how to report samples to the development
4259 * @deprecated Use avpriv_report_missing_feature() instead.
4261 attribute_deprecated
4262 void av_log_missing_feature(void *avc, const char *feature, int want_sample);
4265 * Log a generic warning message asking for a sample. This function is
4266 * intended to be used internally by Libav (libavcodec, libavformat, etc.)
4267 * only, and would normally not be used by applications.
4268 * @param[in] avc a pointer to an arbitrary struct of which the first field is
4269 * a pointer to an AVClass struct
4270 * @param[in] msg string containing an optional message, or NULL if no message
4271 * @deprecated Use avpriv_request_sample() instead.
4273 attribute_deprecated
4274 void av_log_ask_for_sample(void *avc, const char *msg, ...) av_printf_format(2, 3);
4275 #endif /* FF_API_MISSING_SAMPLE */
4278 * Register the hardware accelerator hwaccel.
4280 void av_register_hwaccel(AVHWAccel *hwaccel);
4283 * If hwaccel is NULL, returns the first registered hardware accelerator,
4284 * if hwaccel is non-NULL, returns the next registered hardware accelerator
4285 * after hwaccel, or NULL if hwaccel is the last one.
4287 AVHWAccel *av_hwaccel_next(AVHWAccel *hwaccel);
4291 * Lock operation used by lockmgr
4294 AV_LOCK_CREATE, ///< Create a mutex
4295 AV_LOCK_OBTAIN, ///< Lock the mutex
4296 AV_LOCK_RELEASE, ///< Unlock the mutex
4297 AV_LOCK_DESTROY, ///< Free mutex resources
4301 * Register a user provided lock manager supporting the operations
4302 * specified by AVLockOp. mutex points to a (void *) where the
4303 * lockmgr should store/get a pointer to a user allocated mutex. It's
4304 * NULL upon AV_LOCK_CREATE and != NULL for all other ops.
4306 * @param cb User defined callback. Note: Libav may invoke calls to this
4307 * callback during the call to av_lockmgr_register().
4308 * Thus, the application must be prepared to handle that.
4309 * If cb is set to NULL the lockmgr will be unregistered.
4310 * Also note that during unregistration the previously registered
4311 * lockmgr callback may also be invoked.
4313 int av_lockmgr_register(int (*cb)(void **mutex, enum AVLockOp op));
4316 * Get the type of the given codec.
4318 enum AVMediaType avcodec_get_type(enum AVCodecID codec_id);
4321 * @return a positive value if s is open (i.e. avcodec_open2() was called on it
4322 * with no corresponding avcodec_close()), 0 otherwise.
4324 int avcodec_is_open(AVCodecContext *s);
4327 * @return a non-zero number if codec is an encoder, zero otherwise
4329 int av_codec_is_encoder(const AVCodec *codec);
4332 * @return a non-zero number if codec is a decoder, zero otherwise
4334 int av_codec_is_decoder(const AVCodec *codec);
4337 * @return descriptor for given codec ID or NULL if no descriptor exists.
4339 const AVCodecDescriptor *avcodec_descriptor_get(enum AVCodecID id);
4342 * Iterate over all codec descriptors known to libavcodec.
4344 * @param prev previous descriptor. NULL to get the first descriptor.
4346 * @return next descriptor or NULL after the last descriptor
4348 const AVCodecDescriptor *avcodec_descriptor_next(const AVCodecDescriptor *prev);
4351 * @return codec descriptor with the given name or NULL if no such descriptor
4354 const AVCodecDescriptor *avcodec_descriptor_get_by_name(const char *name);
4360 #endif /* AVCODEC_AVCODEC_H */