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"
45 * @defgroup libavc Encoding/Decoding Library
48 * @defgroup lavc_decoding Decoding
52 * @defgroup lavc_encoding Encoding
56 * @defgroup lavc_codec Codecs
58 * @defgroup lavc_codec_native Native Codecs
61 * @defgroup lavc_codec_wrappers External library wrappers
64 * @defgroup lavc_codec_hwaccel Hardware Accelerators bridge
68 * @defgroup lavc_internal Internal
76 * @defgroup lavc_core Core functions/structures.
79 * Basic definitions, functions for querying libavcodec capabilities,
80 * allocating core structures, etc.
86 * Identify the syntax and semantics of the bitstream.
87 * The principle is roughly:
88 * Two decoders with the same ID can decode the same streams.
89 * Two encoders with the same ID can encode compatible streams.
90 * There may be slight deviations from the principle due to implementation
93 * If you add a codec ID to this list, add it so that
94 * 1. no value of a existing codec ID changes (that would break ABI),
95 * 2. it is as close as possible to similar codecs.
97 * After adding new codec IDs, do not forget to add an entry to the codec
98 * descriptor list and bump libavcodec minor version.
104 AV_CODEC_ID_MPEG1VIDEO,
105 AV_CODEC_ID_MPEG2VIDEO, ///< preferred ID for MPEG-1/2 video decoding
106 AV_CODEC_ID_MPEG2VIDEO_XVMC,
117 AV_CODEC_ID_RAWVIDEO,
118 AV_CODEC_ID_MSMPEG4V1,
119 AV_CODEC_ID_MSMPEG4V2,
120 AV_CODEC_ID_MSMPEG4V3,
143 AV_CODEC_ID_INTERPLAY_VIDEO,
150 AV_CODEC_ID_MSVIDEO1,
155 AV_CODEC_ID_TRUEMOTION1,
156 AV_CODEC_ID_VMDVIDEO,
181 AV_CODEC_ID_TRUEMOTION2,
187 AV_CODEC_ID_SMACKVIDEO,
192 AV_CODEC_ID_JPEG2000,
198 AV_CODEC_ID_DSICINVIDEO,
199 AV_CODEC_ID_TIERTEXSEQVIDEO,
207 AV_CODEC_ID_BETHSOFTVID,
219 AV_CODEC_ID_ESCAPE124,
223 AV_CODEC_ID_MOTIONPIXELS,
235 AV_CODEC_ID_FLASHSV2,
236 AV_CODEC_ID_CDGRAPHICS,
239 AV_CODEC_ID_BINKVIDEO,
240 AV_CODEC_ID_IFF_ILBM,
241 AV_CODEC_ID_IFF_BYTERUN1,
247 AV_CODEC_ID_A64_MULTI,
248 AV_CODEC_ID_A64_MULTI5,
251 AV_CODEC_ID_LAGARITH,
255 AV_CODEC_ID_WMV3IMAGE,
256 AV_CODEC_ID_VC1IMAGE,
258 AV_CODEC_ID_BMV_VIDEO,
265 AV_CODEC_ID_ZEROCODEC,
274 AV_CODEC_ID_ESCAPE130,
278 /* various PCM "codecs" */
279 AV_CODEC_ID_FIRST_AUDIO = 0x10000, ///< A dummy id pointing at the start of audio codecs
280 AV_CODEC_ID_PCM_S16LE = 0x10000,
281 AV_CODEC_ID_PCM_S16BE,
282 AV_CODEC_ID_PCM_U16LE,
283 AV_CODEC_ID_PCM_U16BE,
286 AV_CODEC_ID_PCM_MULAW,
287 AV_CODEC_ID_PCM_ALAW,
288 AV_CODEC_ID_PCM_S32LE,
289 AV_CODEC_ID_PCM_S32BE,
290 AV_CODEC_ID_PCM_U32LE,
291 AV_CODEC_ID_PCM_U32BE,
292 AV_CODEC_ID_PCM_S24LE,
293 AV_CODEC_ID_PCM_S24BE,
294 AV_CODEC_ID_PCM_U24LE,
295 AV_CODEC_ID_PCM_U24BE,
296 AV_CODEC_ID_PCM_S24DAUD,
297 AV_CODEC_ID_PCM_ZORK,
298 AV_CODEC_ID_PCM_S16LE_PLANAR,
300 AV_CODEC_ID_PCM_F32BE,
301 AV_CODEC_ID_PCM_F32LE,
302 AV_CODEC_ID_PCM_F64BE,
303 AV_CODEC_ID_PCM_F64LE,
304 AV_CODEC_ID_PCM_BLURAY,
307 AV_CODEC_ID_PCM_S8_PLANAR,
308 AV_CODEC_ID_PCM_S24LE_PLANAR,
309 AV_CODEC_ID_PCM_S32LE_PLANAR,
311 /* various ADPCM codecs */
312 AV_CODEC_ID_ADPCM_IMA_QT = 0x11000,
313 AV_CODEC_ID_ADPCM_IMA_WAV,
314 AV_CODEC_ID_ADPCM_IMA_DK3,
315 AV_CODEC_ID_ADPCM_IMA_DK4,
316 AV_CODEC_ID_ADPCM_IMA_WS,
317 AV_CODEC_ID_ADPCM_IMA_SMJPEG,
318 AV_CODEC_ID_ADPCM_MS,
319 AV_CODEC_ID_ADPCM_4XM,
320 AV_CODEC_ID_ADPCM_XA,
321 AV_CODEC_ID_ADPCM_ADX,
322 AV_CODEC_ID_ADPCM_EA,
323 AV_CODEC_ID_ADPCM_G726,
324 AV_CODEC_ID_ADPCM_CT,
325 AV_CODEC_ID_ADPCM_SWF,
326 AV_CODEC_ID_ADPCM_YAMAHA,
327 AV_CODEC_ID_ADPCM_SBPRO_4,
328 AV_CODEC_ID_ADPCM_SBPRO_3,
329 AV_CODEC_ID_ADPCM_SBPRO_2,
330 AV_CODEC_ID_ADPCM_THP,
331 AV_CODEC_ID_ADPCM_IMA_AMV,
332 AV_CODEC_ID_ADPCM_EA_R1,
333 AV_CODEC_ID_ADPCM_EA_R3,
334 AV_CODEC_ID_ADPCM_EA_R2,
335 AV_CODEC_ID_ADPCM_IMA_EA_SEAD,
336 AV_CODEC_ID_ADPCM_IMA_EA_EACS,
337 AV_CODEC_ID_ADPCM_EA_XAS,
338 AV_CODEC_ID_ADPCM_EA_MAXIS_XA,
339 AV_CODEC_ID_ADPCM_IMA_ISS,
340 AV_CODEC_ID_ADPCM_G722,
341 AV_CODEC_ID_ADPCM_IMA_APC,
344 AV_CODEC_ID_AMR_NB = 0x12000,
347 /* RealAudio codecs*/
348 AV_CODEC_ID_RA_144 = 0x13000,
351 /* various DPCM codecs */
352 AV_CODEC_ID_ROQ_DPCM = 0x14000,
353 AV_CODEC_ID_INTERPLAY_DPCM,
354 AV_CODEC_ID_XAN_DPCM,
355 AV_CODEC_ID_SOL_DPCM,
358 AV_CODEC_ID_MP2 = 0x15000,
359 AV_CODEC_ID_MP3, ///< preferred ID for decoding MPEG audio layer 1, 2 or 3
369 AV_CODEC_ID_VMDAUDIO,
375 AV_CODEC_ID_WESTWOOD_SND1,
376 AV_CODEC_ID_GSM, ///< as in Berlin toast format
379 AV_CODEC_ID_TRUESPEECH,
381 AV_CODEC_ID_SMACKAUDIO,
384 AV_CODEC_ID_DSICINAUDIO,
386 AV_CODEC_ID_MUSEPACK7,
388 AV_CODEC_ID_GSM_MS, /* as found in WAV */
394 AV_CODEC_ID_NELLYMOSER,
395 AV_CODEC_ID_MUSEPACK8,
397 AV_CODEC_ID_WMAVOICE,
399 AV_CODEC_ID_WMALOSSLESS,
408 AV_CODEC_ID_BINKAUDIO_RDFT,
409 AV_CODEC_ID_BINKAUDIO_DCT,
410 AV_CODEC_ID_AAC_LATM,
415 AV_CODEC_ID_8SVX_EXP,
416 AV_CODEC_ID_8SVX_FIB,
417 AV_CODEC_ID_BMV_AUDIO,
422 AV_CODEC_ID_COMFORT_NOISE,
424 AV_CODEC_ID_METASOUND,
426 /* subtitle codecs */
427 AV_CODEC_ID_FIRST_SUBTITLE = 0x17000, ///< A dummy ID pointing at the start of subtitle codecs.
428 AV_CODEC_ID_DVD_SUBTITLE = 0x17000,
429 AV_CODEC_ID_DVB_SUBTITLE,
430 AV_CODEC_ID_TEXT, ///< raw UTF-8 text
433 AV_CODEC_ID_MOV_TEXT,
434 AV_CODEC_ID_HDMV_PGS_SUBTITLE,
435 AV_CODEC_ID_DVB_TELETEXT,
438 /* other specific kind of codecs (generally used for attachments) */
439 AV_CODEC_ID_FIRST_UNKNOWN = 0x18000, ///< A dummy ID pointing at the start of various fake codecs.
440 AV_CODEC_ID_TTF = 0x18000,
442 AV_CODEC_ID_PROBE = 0x19000, ///< codec_id is not known (like AV_CODEC_ID_NONE) but lavf should attempt to identify it
444 AV_CODEC_ID_MPEG2TS = 0x20000, /**< _FAKE_ codec to indicate a raw MPEG-2 TS
445 * stream (only used by libavformat) */
446 AV_CODEC_ID_MPEG4SYSTEMS = 0x20001, /**< _FAKE_ codec to indicate a MPEG-4 Systems
447 * stream (only used by libavformat) */
448 AV_CODEC_ID_FFMETADATA = 0x21000, ///< Dummy codec for streams containing only metadata information.
452 * This struct describes the properties of a single codec described by an
454 * @see avcodec_get_descriptor()
456 typedef struct AVCodecDescriptor {
458 enum AVMediaType type;
460 * Name of the codec described by this descriptor. It is non-empty and
461 * unique for each codec descriptor. It should contain alphanumeric
462 * characters and '_' only.
466 * A more descriptive name for this codec. May be NULL.
468 const char *long_name;
470 * Codec properties, a combination of AV_CODEC_PROP_* flags.
476 * Codec uses only intra compression.
479 #define AV_CODEC_PROP_INTRA_ONLY (1 << 0)
481 * Codec supports lossy compression. Audio and video codecs only.
482 * @note a codec may support both lossy and lossless
485 #define AV_CODEC_PROP_LOSSY (1 << 1)
487 * Codec supports lossless compression. Audio and video codecs only.
489 #define AV_CODEC_PROP_LOSSLESS (1 << 2)
492 * @ingroup lavc_decoding
493 * Required number of additionally allocated bytes at the end of the input bitstream for decoding.
494 * This is mainly needed because some optimized bitstream readers read
495 * 32 or 64 bit at once and could read over the end.<br>
496 * Note: If the first 23 bits of the additional bytes are not 0, then damaged
497 * MPEG bitstreams could cause overread and segfault.
499 #define FF_INPUT_BUFFER_PADDING_SIZE 8
502 * @ingroup lavc_encoding
503 * minimum encoding buffer size
504 * Used to avoid some checks during header writing.
506 #define FF_MIN_BUFFER_SIZE 16384
510 * @ingroup lavc_encoding
511 * motion estimation type.
514 ME_ZERO = 1, ///< no search, that is use 0,0 vector whenever one is needed
518 ME_EPZS, ///< enhanced predictive zonal search
519 ME_X1, ///< reserved for experiments
520 ME_HEX, ///< hexagon based search
521 ME_UMH, ///< uneven multi-hexagon search
522 ME_TESA, ///< transformed exhaustive search algorithm
526 * @ingroup lavc_decoding
529 /* We leave some space between them for extensions (drop some
530 * keyframes for intra-only or drop just some bidir frames). */
531 AVDISCARD_NONE =-16, ///< discard nothing
532 AVDISCARD_DEFAULT = 0, ///< discard useless packets like 0 size packets in avi
533 AVDISCARD_NONREF = 8, ///< discard all non reference
534 AVDISCARD_BIDIR = 16, ///< discard all bidirectional frames
535 AVDISCARD_NONKEY = 32, ///< discard all frames except keyframes
536 AVDISCARD_ALL = 48, ///< discard all
539 enum AVColorPrimaries{
540 AVCOL_PRI_BT709 = 1, ///< also ITU-R BT1361 / IEC 61966-2-4 / SMPTE RP177 Annex B
541 AVCOL_PRI_UNSPECIFIED = 2,
542 AVCOL_PRI_BT470M = 4,
543 AVCOL_PRI_BT470BG = 5, ///< also ITU-R BT601-6 625 / ITU-R BT1358 625 / ITU-R BT1700 625 PAL & SECAM
544 AVCOL_PRI_SMPTE170M = 6, ///< also ITU-R BT601-6 525 / ITU-R BT1358 525 / ITU-R BT1700 NTSC
545 AVCOL_PRI_SMPTE240M = 7, ///< functionally identical to above
547 AVCOL_PRI_NB , ///< Not part of ABI
550 enum AVColorTransferCharacteristic{
551 AVCOL_TRC_BT709 = 1, ///< also ITU-R BT1361
552 AVCOL_TRC_UNSPECIFIED = 2,
553 AVCOL_TRC_GAMMA22 = 4, ///< also ITU-R BT470M / ITU-R BT1700 625 PAL & SECAM
554 AVCOL_TRC_GAMMA28 = 5, ///< also ITU-R BT470BG
555 AVCOL_TRC_SMPTE240M = 7,
556 AVCOL_TRC_NB , ///< Not part of ABI
561 AVCOL_SPC_BT709 = 1, ///< also ITU-R BT1361 / IEC 61966-2-4 xvYCC709 / SMPTE RP177 Annex B
562 AVCOL_SPC_UNSPECIFIED = 2,
564 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
565 AVCOL_SPC_SMPTE170M = 6, ///< also ITU-R BT601-6 525 / ITU-R BT1358 525 / ITU-R BT1700 NTSC / functionally identical to above
566 AVCOL_SPC_SMPTE240M = 7,
567 AVCOL_SPC_YCOCG = 8, ///< Used by Dirac / VC-2 and H.264 FRext, see ITU-T SG16
568 AVCOL_SPC_NB , ///< Not part of ABI
572 AVCOL_RANGE_UNSPECIFIED = 0,
573 AVCOL_RANGE_MPEG = 1, ///< the normal 219*2^(n-8) "MPEG" YUV ranges
574 AVCOL_RANGE_JPEG = 2, ///< the normal 2^n-1 "JPEG" YUV ranges
575 AVCOL_RANGE_NB , ///< Not part of ABI
579 * X X 3 4 X X are luma samples,
580 * 1 2 1-6 are possible chroma positions
581 * X X 5 6 X 0 is undefined/unknown position
583 enum AVChromaLocation{
584 AVCHROMA_LOC_UNSPECIFIED = 0,
585 AVCHROMA_LOC_LEFT = 1, ///< mpeg2/4, h264 default
586 AVCHROMA_LOC_CENTER = 2, ///< mpeg1, jpeg, h263
587 AVCHROMA_LOC_TOPLEFT = 3, ///< DV
588 AVCHROMA_LOC_TOP = 4,
589 AVCHROMA_LOC_BOTTOMLEFT = 5,
590 AVCHROMA_LOC_BOTTOM = 6,
591 AVCHROMA_LOC_NB , ///< Not part of ABI
594 enum AVAudioServiceType {
595 AV_AUDIO_SERVICE_TYPE_MAIN = 0,
596 AV_AUDIO_SERVICE_TYPE_EFFECTS = 1,
597 AV_AUDIO_SERVICE_TYPE_VISUALLY_IMPAIRED = 2,
598 AV_AUDIO_SERVICE_TYPE_HEARING_IMPAIRED = 3,
599 AV_AUDIO_SERVICE_TYPE_DIALOGUE = 4,
600 AV_AUDIO_SERVICE_TYPE_COMMENTARY = 5,
601 AV_AUDIO_SERVICE_TYPE_EMERGENCY = 6,
602 AV_AUDIO_SERVICE_TYPE_VOICE_OVER = 7,
603 AV_AUDIO_SERVICE_TYPE_KARAOKE = 8,
604 AV_AUDIO_SERVICE_TYPE_NB , ///< Not part of ABI
608 * @ingroup lavc_encoding
610 typedef struct RcOverride{
613 int qscale; // If this is 0 then quality_factor will be used instead.
614 float quality_factor;
617 #define FF_MAX_B_FRAMES 16
620 These flags can be passed in AVCodecContext.flags before initialization.
621 Note: Not everything is supported yet.
625 * Allow decoders to produce frames with data planes that are not aligned
626 * to CPU requirements (e.g. due to cropping).
628 #define CODEC_FLAG_UNALIGNED 0x0001
629 #define CODEC_FLAG_QSCALE 0x0002 ///< Use fixed qscale.
630 #define CODEC_FLAG_4MV 0x0004 ///< 4 MV per MB allowed / advanced prediction for H.263.
631 #define CODEC_FLAG_QPEL 0x0010 ///< Use qpel MC.
632 #define CODEC_FLAG_GMC 0x0020 ///< Use GMC.
633 #define CODEC_FLAG_MV0 0x0040 ///< Always try a MB with MV=<0,0>.
635 * The parent program guarantees that the input for B-frames containing
636 * streams is not written to for at least s->max_b_frames+1 frames, if
637 * this is not set the input will be copied.
639 #define CODEC_FLAG_INPUT_PRESERVED 0x0100
640 #define CODEC_FLAG_PASS1 0x0200 ///< Use internal 2pass ratecontrol in first pass mode.
641 #define CODEC_FLAG_PASS2 0x0400 ///< Use internal 2pass ratecontrol in second pass mode.
642 #define CODEC_FLAG_GRAY 0x2000 ///< Only decode/encode grayscale.
643 #define CODEC_FLAG_EMU_EDGE 0x4000 ///< Don't draw edges.
644 #define CODEC_FLAG_PSNR 0x8000 ///< error[?] variables will be set during encoding.
645 #define CODEC_FLAG_TRUNCATED 0x00010000 /** Input bitstream might be truncated at a random
646 location instead of only at frame boundaries. */
647 #define CODEC_FLAG_NORMALIZE_AQP 0x00020000 ///< Normalize adaptive quantization.
648 #define CODEC_FLAG_INTERLACED_DCT 0x00040000 ///< Use interlaced DCT.
649 #define CODEC_FLAG_LOW_DELAY 0x00080000 ///< Force low delay.
650 #define CODEC_FLAG_GLOBAL_HEADER 0x00400000 ///< Place global headers in extradata instead of every keyframe.
651 #define CODEC_FLAG_BITEXACT 0x00800000 ///< Use only bitexact stuff (except (I)DCT).
652 /* Fx : Flag for h263+ extra options */
653 #define CODEC_FLAG_AC_PRED 0x01000000 ///< H.263 advanced intra coding / MPEG-4 AC prediction
654 #define CODEC_FLAG_LOOP_FILTER 0x00000800 ///< loop filter
655 #define CODEC_FLAG_INTERLACED_ME 0x20000000 ///< interlaced motion estimation
656 #define CODEC_FLAG_CLOSED_GOP 0x80000000
657 #define CODEC_FLAG2_FAST 0x00000001 ///< Allow non spec compliant speedup tricks.
658 #define CODEC_FLAG2_NO_OUTPUT 0x00000004 ///< Skip bitstream encoding.
659 #define CODEC_FLAG2_LOCAL_HEADER 0x00000008 ///< Place global headers at every keyframe instead of in extradata.
660 #define CODEC_FLAG2_IGNORE_CROP 0x00010000 ///< Discard cropping information from SPS.
662 #define CODEC_FLAG2_CHUNKS 0x00008000 ///< Input bitstream might be truncated at a packet boundaries instead of only at frame boundaries.
664 /* Unsupported options :
665 * Syntax Arithmetic coding (SAC)
666 * Reference Picture Selection
667 * Independent Segment Decoding */
669 /* codec capabilities */
671 #define CODEC_CAP_DRAW_HORIZ_BAND 0x0001 ///< Decoder can use draw_horiz_band callback.
673 * Codec uses get_buffer() for allocating buffers and supports custom allocators.
674 * If not set, it might not use get_buffer() at all or use operations that
675 * assume the buffer was allocated by avcodec_default_get_buffer.
677 #define CODEC_CAP_DR1 0x0002
678 #define CODEC_CAP_TRUNCATED 0x0008
679 /* Codec can export data for HW decoding (XvMC). */
680 #define CODEC_CAP_HWACCEL 0x0010
682 * Encoder or decoder requires flushing with NULL input at the end in order to
683 * give the complete and correct output.
685 * NOTE: If this flag is not set, the codec is guaranteed to never be fed with
686 * with NULL data. The user can still send NULL data to the public encode
687 * or decode function, but libavcodec will not pass it along to the codec
688 * unless this flag is set.
691 * The decoder has a non-zero delay and needs to be fed with avpkt->data=NULL,
692 * avpkt->size=0 at the end to get the delayed data until the decoder no longer
696 * The encoder needs to be fed with NULL data at the end of encoding until the
697 * encoder no longer returns data.
699 * NOTE: For encoders implementing the AVCodec.encode2() function, setting this
700 * flag also means that the encoder must set the pts and duration for
701 * each output packet. If this flag is not set, the pts and duration will
702 * be determined by libavcodec from the input frame.
704 #define CODEC_CAP_DELAY 0x0020
706 * Codec can be fed a final frame with a smaller size.
707 * This can be used to prevent truncation of the last audio samples.
709 #define CODEC_CAP_SMALL_LAST_FRAME 0x0040
712 * Codec can export data for HW decoding (VDPAU).
714 #define CODEC_CAP_HWACCEL_VDPAU 0x0080
717 * Codec can output multiple frames per AVPacket
718 * Normally demuxers return one frame at a time, demuxers which do not do
719 * are connected to a parser to split what they return into proper frames.
720 * This flag is reserved to the very rare category of codecs which have a
721 * bitstream that cannot be split into frames without timeconsuming
722 * operations like full decoding. Demuxers carring such bitstreams thus
723 * may return multiple frames in a packet. This has many disadvantages like
724 * prohibiting stream copy in many cases thus it should only be considered
727 #define CODEC_CAP_SUBFRAMES 0x0100
729 * Codec is experimental and is thus avoided in favor of non experimental
732 #define CODEC_CAP_EXPERIMENTAL 0x0200
734 * Codec should fill in channel configuration and samplerate instead of container
736 #define CODEC_CAP_CHANNEL_CONF 0x0400
738 * Codec is able to deal with negative linesizes
740 #define CODEC_CAP_NEG_LINESIZES 0x0800
742 * Codec supports frame-level multithreading.
744 #define CODEC_CAP_FRAME_THREADS 0x1000
746 * Codec supports slice-based (or partition-based) multithreading.
748 #define CODEC_CAP_SLICE_THREADS 0x2000
750 * Codec supports changed parameters at any point.
752 #define CODEC_CAP_PARAM_CHANGE 0x4000
754 * Codec supports avctx->thread_count == 0 (auto).
756 #define CODEC_CAP_AUTO_THREADS 0x8000
758 * Audio encoder supports receiving a different number of samples in each call.
760 #define CODEC_CAP_VARIABLE_FRAME_SIZE 0x10000
762 //The following defines may change, don't expect compatibility if you use them.
763 #define MB_TYPE_INTRA4x4 0x0001
764 #define MB_TYPE_INTRA16x16 0x0002 //FIXME H.264-specific
765 #define MB_TYPE_INTRA_PCM 0x0004 //FIXME H.264-specific
766 #define MB_TYPE_16x16 0x0008
767 #define MB_TYPE_16x8 0x0010
768 #define MB_TYPE_8x16 0x0020
769 #define MB_TYPE_8x8 0x0040
770 #define MB_TYPE_INTERLACED 0x0080
771 #define MB_TYPE_DIRECT2 0x0100 //FIXME
772 #define MB_TYPE_ACPRED 0x0200
773 #define MB_TYPE_GMC 0x0400
774 #define MB_TYPE_SKIP 0x0800
775 #define MB_TYPE_P0L0 0x1000
776 #define MB_TYPE_P1L0 0x2000
777 #define MB_TYPE_P0L1 0x4000
778 #define MB_TYPE_P1L1 0x8000
779 #define MB_TYPE_L0 (MB_TYPE_P0L0 | MB_TYPE_P1L0)
780 #define MB_TYPE_L1 (MB_TYPE_P0L1 | MB_TYPE_P1L1)
781 #define MB_TYPE_L0L1 (MB_TYPE_L0 | MB_TYPE_L1)
782 #define MB_TYPE_QUANT 0x00010000
783 #define MB_TYPE_CBP 0x00020000
784 //Note bits 24-31 are reserved for codec specific use (h264 ref0, mpeg1 0mv, ...)
788 * This specifies the area which should be displayed.
789 * Note there may be multiple such areas for one frame.
791 typedef struct AVPanScan{
794 * - encoding: Set by user.
795 * - decoding: Set by libavcodec.
800 * width and height in 1/16 pel
801 * - encoding: Set by user.
802 * - decoding: Set by libavcodec.
808 * position of the top left corner in 1/16 pel for up to 3 fields/frames
809 * - encoding: Set by user.
810 * - decoding: Set by libavcodec.
812 int16_t position[3][2];
815 #define FF_QSCALE_TYPE_MPEG1 0
816 #define FF_QSCALE_TYPE_MPEG2 1
817 #define FF_QSCALE_TYPE_H264 2
818 #define FF_QSCALE_TYPE_VP56 3
820 #if FF_API_GET_BUFFER
821 #define FF_BUFFER_TYPE_INTERNAL 1
822 #define FF_BUFFER_TYPE_USER 2 ///< direct rendering buffers (image is (de)allocated by user)
823 #define FF_BUFFER_TYPE_SHARED 4 ///< Buffer from somewhere else; don't deallocate image (data/base), all other tables are not shared.
824 #define FF_BUFFER_TYPE_COPY 8 ///< Just a (modified) copy of some other buffer, don't deallocate anything.
826 #define FF_BUFFER_HINTS_VALID 0x01 // Buffer hints value is meaningful (if 0 ignore).
827 #define FF_BUFFER_HINTS_READABLE 0x02 // Codec will read from buffer.
828 #define FF_BUFFER_HINTS_PRESERVE 0x04 // User must not alter buffer content.
829 #define FF_BUFFER_HINTS_REUSABLE 0x08 // Codec will reuse the buffer (update).
833 * The decoder will keep a reference to the frame and may reuse it later.
835 #define AV_GET_BUFFER_FLAG_REF (1 << 0)
838 * @defgroup lavc_packet AVPacket
840 * Types and functions for working with AVPacket.
843 enum AVPacketSideDataType {
845 AV_PKT_DATA_NEW_EXTRADATA,
848 * An AV_PKT_DATA_PARAM_CHANGE side data packet is laid out as follows:
851 * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_COUNT)
852 * s32le channel_count
853 * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_LAYOUT)
854 * u64le channel_layout
855 * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_SAMPLE_RATE)
857 * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_DIMENSIONS)
862 AV_PKT_DATA_PARAM_CHANGE,
865 * An AV_PKT_DATA_H263_MB_INFO side data packet contains a number of
866 * structures with info about macroblocks relevant to splitting the
867 * packet into smaller packets on macroblock edges (e.g. as for RFC 2190).
868 * That is, it does not necessarily contain info about all macroblocks,
869 * as long as the distance between macroblocks in the info is smaller
870 * than the target payload size.
871 * Each MB info structure is 12 bytes, and is laid out as follows:
873 * u32le bit offset from the start of the packet
874 * u8 current quantizer at the start of the macroblock
876 * u16le macroblock address within the GOB
877 * u8 horizontal MV predictor
878 * u8 vertical MV predictor
879 * u8 horizontal MV predictor for block number 3
880 * u8 vertical MV predictor for block number 3
883 AV_PKT_DATA_H263_MB_INFO,
887 * This structure stores compressed data. It is typically exported by demuxers
888 * and then passed as input to decoders, or received as output from encoders and
889 * then passed to muxers.
891 * For video, it should typically contain one compressed frame. For audio it may
892 * contain several compressed frames.
894 * AVPacket is one of the few structs in Libav, whose size is a part of public
895 * ABI. Thus it may be allocated on stack and no new fields can be added to it
896 * without libavcodec and libavformat major bump.
898 * The semantics of data ownership depends on the buf or destruct (deprecated)
899 * fields. If either is set, the packet data is dynamically allocated and is
900 * valid indefinitely until av_free_packet() is called (which in turn calls
901 * av_buffer_unref()/the destruct callback to free the data). If neither is set,
902 * the packet data is typically backed by some static buffer somewhere and is
903 * only valid for a limited time (e.g. until the next read call when demuxing).
905 * The side data is always allocated with av_malloc() and is freed in
908 typedef struct AVPacket {
910 * A reference to the reference-counted buffer where the packet data is
912 * May be NULL, then the packet data is not reference-counted.
916 * Presentation timestamp in AVStream->time_base units; the time at which
917 * the decompressed packet will be presented to the user.
918 * Can be AV_NOPTS_VALUE if it is not stored in the file.
919 * pts MUST be larger or equal to dts as presentation cannot happen before
920 * decompression, unless one wants to view hex dumps. Some formats misuse
921 * the terms dts and pts/cts to mean something different. Such timestamps
922 * must be converted to true pts/dts before they are stored in AVPacket.
926 * Decompression timestamp in AVStream->time_base units; the time at which
927 * the packet is decompressed.
928 * Can be AV_NOPTS_VALUE if it is not stored in the file.
935 * A combination of AV_PKT_FLAG values
939 * Additional packet data that can be provided by the container.
940 * Packet can contain several types of side information.
945 enum AVPacketSideDataType type;
950 * Duration of this packet in AVStream->time_base units, 0 if unknown.
951 * Equals next_pts - this_pts in presentation order.
954 #if FF_API_DESTRUCT_PACKET
956 void (*destruct)(struct AVPacket *);
960 int64_t pos; ///< byte position in stream, -1 if unknown
963 * Time difference in AVStream->time_base units from the pts of this
964 * packet to the point at which the output from the decoder has converged
965 * independent from the availability of previous frames. That is, the
966 * frames are virtually identical no matter if decoding started from
967 * the very first frame or from this keyframe.
968 * Is AV_NOPTS_VALUE if unknown.
969 * This field is not the display duration of the current packet.
970 * This field has no meaning if the packet does not have AV_PKT_FLAG_KEY
973 * The purpose of this field is to allow seeking in streams that have no
974 * keyframes in the conventional sense. It corresponds to the
975 * recovery point SEI in H.264 and match_time_delta in NUT. It is also
976 * essential for some types of subtitle streams to ensure that all
977 * subtitles are correctly displayed after seeking.
979 int64_t convergence_duration;
981 #define AV_PKT_FLAG_KEY 0x0001 ///< The packet contains a keyframe
982 #define AV_PKT_FLAG_CORRUPT 0x0002 ///< The packet content is corrupted
984 enum AVSideDataParamChangeFlags {
985 AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_COUNT = 0x0001,
986 AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_LAYOUT = 0x0002,
987 AV_SIDE_DATA_PARAM_CHANGE_SAMPLE_RATE = 0x0004,
988 AV_SIDE_DATA_PARAM_CHANGE_DIMENSIONS = 0x0008,
994 struct AVCodecInternal;
998 AV_FIELD_PROGRESSIVE,
999 AV_FIELD_TT, //< Top coded_first, top displayed first
1000 AV_FIELD_BB, //< Bottom coded first, bottom displayed first
1001 AV_FIELD_TB, //< Top coded first, bottom displayed first
1002 AV_FIELD_BT, //< Bottom coded first, top displayed first
1006 * main external API structure.
1007 * New fields can be added to the end with minor version bumps.
1008 * Removal, reordering and changes to existing fields require a major
1010 * sizeof(AVCodecContext) must not be used outside libav*.
1012 typedef struct AVCodecContext {
1014 * information on struct for av_log
1015 * - set by avcodec_alloc_context3
1017 const AVClass *av_class;
1018 int log_level_offset;
1020 enum AVMediaType codec_type; /* see AVMEDIA_TYPE_xxx */
1021 const struct AVCodec *codec;
1022 char codec_name[32];
1023 enum AVCodecID codec_id; /* see AV_CODEC_ID_xxx */
1026 * fourcc (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A').
1027 * This is used to work around some encoder bugs.
1028 * A demuxer should set this to what is stored in the field used to identify the codec.
1029 * If there are multiple such fields in a container then the demuxer should choose the one
1030 * which maximizes the information about the used codec.
1031 * If the codec tag field in a container is larger than 32 bits then the demuxer should
1032 * remap the longer ID to 32 bits with a table or other structure. Alternatively a new
1033 * extra_codec_tag + size could be added but for this a clear advantage must be demonstrated
1035 * - encoding: Set by user, if not then the default based on codec_id will be used.
1036 * - decoding: Set by user, will be converted to uppercase by libavcodec during init.
1038 unsigned int codec_tag;
1041 * fourcc from the AVI stream header (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A').
1042 * This is used to work around some encoder bugs.
1043 * - encoding: unused
1044 * - decoding: Set by user, will be converted to uppercase by libavcodec during init.
1046 unsigned int stream_codec_tag;
1051 * Private context used for internal data.
1053 * Unlike priv_data, this is not codec-specific. It is used in general
1054 * libavcodec functions.
1056 struct AVCodecInternal *internal;
1059 * Private data of the user, can be used to carry app specific stuff.
1060 * - encoding: Set by user.
1061 * - decoding: Set by user.
1066 * the average bitrate
1067 * - encoding: Set by user; unused for constant quantizer encoding.
1068 * - decoding: Set by libavcodec. 0 or some bitrate if this info is available in the stream.
1073 * number of bits the bitstream is allowed to diverge from the reference.
1074 * the reference can be CBR (for CBR pass1) or VBR (for pass2)
1075 * - encoding: Set by user; unused for constant quantizer encoding.
1076 * - decoding: unused
1078 int bit_rate_tolerance;
1081 * Global quality for codecs which cannot change it per frame.
1082 * This should be proportional to MPEG-1/2/4 qscale.
1083 * - encoding: Set by user.
1084 * - decoding: unused
1089 * - encoding: Set by user.
1090 * - decoding: unused
1092 int compression_level;
1093 #define FF_COMPRESSION_DEFAULT -1
1097 * - encoding: Set by user.
1098 * - decoding: Set by user.
1104 * - encoding: Set by user.
1105 * - decoding: Set by user.
1110 * some codecs need / can use extradata like Huffman tables.
1111 * mjpeg: Huffman tables
1112 * rv10: additional flags
1113 * mpeg4: global headers (they can be in the bitstream or here)
1114 * The allocated memory should be FF_INPUT_BUFFER_PADDING_SIZE bytes larger
1115 * than extradata_size to avoid prolems if it is read with the bitstream reader.
1116 * The bytewise contents of extradata must not depend on the architecture or CPU endianness.
1117 * - encoding: Set/allocated/freed by libavcodec.
1118 * - decoding: Set/allocated/freed by user.
1124 * This is the fundamental unit of time (in seconds) in terms
1125 * of which frame timestamps are represented. For fixed-fps content,
1126 * timebase should be 1/framerate and timestamp increments should be
1128 * - encoding: MUST be set by user.
1129 * - decoding: Set by libavcodec.
1131 AVRational time_base;
1134 * For some codecs, the time base is closer to the field rate than the frame rate.
1135 * Most notably, H.264 and MPEG-2 specify time_base as half of frame duration
1136 * if no telecine is used ...
1138 * Set to time_base ticks per frame. Default 1, e.g., H.264/MPEG-2 set it to 2.
1140 int ticks_per_frame;
1146 * Number of frames the decoded output will be delayed relative to the
1150 * For encoding, this is the number of "priming" samples added to the
1151 * beginning of the stream. The decoded output will be delayed by this
1152 * many samples relative to the input to the encoder. Note that this
1153 * field is purely informational and does not directly affect the pts
1154 * output by the encoder, which should always be based on the actual
1155 * presentation time, including any delay.
1156 * For decoding, this is the number of samples the decoder needs to
1157 * output before the decoder's output is valid. When seeking, you should
1158 * start decoding this many samples prior to your desired seek point.
1160 * - encoding: Set by libavcodec.
1161 * - decoding: Set by libavcodec.
1168 * picture width / height.
1169 * - encoding: MUST be set by user.
1170 * - decoding: May be set by the user before opening the decoder if known e.g.
1171 * from the container. Some decoders will require the dimensions
1172 * to be set by the caller. During decoding, the decoder may
1173 * overwrite those values as required.
1178 * Bitstream width / height, may be different from width/height e.g. when
1179 * the decoded frame is cropped before being output.
1180 * - encoding: unused
1181 * - decoding: May be set by the user before opening the decoder if known
1182 * e.g. from the container. During decoding, the decoder may
1183 * overwrite those values as required.
1185 int coded_width, coded_height;
1187 #define FF_ASPECT_EXTENDED 15
1190 * the number of pictures in a group of pictures, or 0 for intra_only
1191 * - encoding: Set by user.
1192 * - decoding: unused
1197 * Pixel format, see AV_PIX_FMT_xxx.
1198 * May be set by the demuxer if known from headers.
1199 * May be overriden by the decoder if it knows better.
1200 * - encoding: Set by user.
1201 * - decoding: Set by user if known, overridden by libavcodec if known
1203 enum AVPixelFormat pix_fmt;
1206 * Motion estimation algorithm used for video coding.
1207 * 1 (zero), 2 (full), 3 (log), 4 (phods), 5 (epzs), 6 (x1), 7 (hex),
1208 * 8 (umh), 10 (tesa) [7, 8, 10 are x264 specific]
1209 * - encoding: MUST be set by user.
1210 * - decoding: unused
1215 * If non NULL, 'draw_horiz_band' is called by the libavcodec
1216 * decoder to draw a horizontal band. It improves cache usage. Not
1217 * all codecs can do that. You must check the codec capabilities
1219 * When multithreading is used, it may be called from multiple threads
1220 * at the same time; threads might draw different parts of the same AVFrame,
1221 * or multiple AVFrames, and there is no guarantee that slices will be drawn
1223 * The function is also used by hardware acceleration APIs.
1224 * It is called at least once during frame decoding to pass
1225 * the data needed for hardware render.
1226 * In that mode instead of pixel data, AVFrame points to
1227 * a structure specific to the acceleration API. The application
1228 * reads the structure and can change some fields to indicate progress
1230 * - encoding: unused
1231 * - decoding: Set by user.
1232 * @param height the height of the slice
1233 * @param y the y position of the slice
1234 * @param type 1->top field, 2->bottom field, 3->frame
1235 * @param offset offset into the AVFrame.data from which the slice should be read
1237 void (*draw_horiz_band)(struct AVCodecContext *s,
1238 const AVFrame *src, int offset[AV_NUM_DATA_POINTERS],
1239 int y, int type, int height);
1242 * callback to negotiate the pixelFormat
1243 * @param fmt is the list of formats which are supported by the codec,
1244 * it is terminated by -1 as 0 is a valid format, the formats are ordered by quality.
1245 * The first is always the native one.
1246 * @return the chosen format
1247 * - encoding: unused
1248 * - decoding: Set by user, if not set the native format will be chosen.
1250 enum AVPixelFormat (*get_format)(struct AVCodecContext *s, const enum AVPixelFormat * fmt);
1253 * maximum number of B-frames between non-B-frames
1254 * Note: The output will be delayed by max_b_frames+1 relative to the input.
1255 * - encoding: Set by user.
1256 * - decoding: unused
1261 * qscale factor between IP and B-frames
1262 * If > 0 then the last P-frame quantizer will be used (q= lastp_q*factor+offset).
1263 * If < 0 then normal ratecontrol will be done (q= -normal_q*factor+offset).
1264 * - encoding: Set by user.
1265 * - decoding: unused
1267 float b_quant_factor;
1269 /** obsolete FIXME remove */
1271 #define FF_RC_STRATEGY_XVID 1
1273 int b_frame_strategy;
1276 * qscale offset between IP and B-frames
1277 * - encoding: Set by user.
1278 * - decoding: unused
1280 float b_quant_offset;
1283 * Size of the frame reordering buffer in the decoder.
1284 * For MPEG-2 it is 1 IPB or 0 low delay IP.
1285 * - encoding: Set by libavcodec.
1286 * - decoding: Set by libavcodec.
1291 * 0-> h263 quant 1-> mpeg quant
1292 * - encoding: Set by user.
1293 * - decoding: unused
1298 * qscale factor between P and I-frames
1299 * If > 0 then the last p frame quantizer will be used (q= lastp_q*factor+offset).
1300 * If < 0 then normal ratecontrol will be done (q= -normal_q*factor+offset).
1301 * - encoding: Set by user.
1302 * - decoding: unused
1304 float i_quant_factor;
1307 * qscale offset between P and I-frames
1308 * - encoding: Set by user.
1309 * - decoding: unused
1311 float i_quant_offset;
1314 * luminance masking (0-> disabled)
1315 * - encoding: Set by user.
1316 * - decoding: unused
1321 * temporary complexity masking (0-> disabled)
1322 * - encoding: Set by user.
1323 * - decoding: unused
1325 float temporal_cplx_masking;
1328 * spatial complexity masking (0-> disabled)
1329 * - encoding: Set by user.
1330 * - decoding: unused
1332 float spatial_cplx_masking;
1335 * p block masking (0-> disabled)
1336 * - encoding: Set by user.
1337 * - decoding: unused
1342 * darkness masking (0-> disabled)
1343 * - encoding: Set by user.
1344 * - decoding: unused
1350 * - encoding: Set by libavcodec.
1351 * - decoding: Set by user (or 0).
1355 * prediction method (needed for huffyuv)
1356 * - encoding: Set by user.
1357 * - decoding: unused
1359 int prediction_method;
1360 #define FF_PRED_LEFT 0
1361 #define FF_PRED_PLANE 1
1362 #define FF_PRED_MEDIAN 2
1365 * slice offsets in the frame in bytes
1366 * - encoding: Set/allocated by libavcodec.
1367 * - decoding: Set/allocated by user (or NULL).
1372 * sample aspect ratio (0 if unknown)
1373 * That is the width of a pixel divided by the height of the pixel.
1374 * Numerator and denominator must be relatively prime and smaller than 256 for some video standards.
1375 * - encoding: Set by user.
1376 * - decoding: Set by libavcodec.
1378 AVRational sample_aspect_ratio;
1381 * motion estimation comparison function
1382 * - encoding: Set by user.
1383 * - decoding: unused
1387 * subpixel motion estimation comparison function
1388 * - encoding: Set by user.
1389 * - decoding: unused
1393 * macroblock comparison function (not supported yet)
1394 * - encoding: Set by user.
1395 * - decoding: unused
1399 * interlaced DCT comparison function
1400 * - encoding: Set by user.
1401 * - decoding: unused
1404 #define FF_CMP_SAD 0
1405 #define FF_CMP_SSE 1
1406 #define FF_CMP_SATD 2
1407 #define FF_CMP_DCT 3
1408 #define FF_CMP_PSNR 4
1409 #define FF_CMP_BIT 5
1411 #define FF_CMP_ZERO 7
1412 #define FF_CMP_VSAD 8
1413 #define FF_CMP_VSSE 9
1414 #define FF_CMP_NSSE 10
1415 #define FF_CMP_DCTMAX 13
1416 #define FF_CMP_DCT264 14
1417 #define FF_CMP_CHROMA 256
1420 * ME diamond size & shape
1421 * - encoding: Set by user.
1422 * - decoding: unused
1427 * amount of previous MV predictors (2a+1 x 2a+1 square)
1428 * - encoding: Set by user.
1429 * - decoding: unused
1431 int last_predictor_count;
1434 * prepass for motion estimation
1435 * - encoding: Set by user.
1436 * - decoding: unused
1441 * motion estimation prepass comparison function
1442 * - encoding: Set by user.
1443 * - decoding: unused
1448 * ME prepass diamond size & shape
1449 * - encoding: Set by user.
1450 * - decoding: unused
1456 * - encoding: Set by user.
1457 * - decoding: unused
1459 int me_subpel_quality;
1462 * DTG active format information (additional aspect ratio
1463 * information only used in DVB MPEG-2 transport streams)
1466 * - encoding: unused
1467 * - decoding: Set by decoder.
1469 int dtg_active_format;
1470 #define FF_DTG_AFD_SAME 8
1471 #define FF_DTG_AFD_4_3 9
1472 #define FF_DTG_AFD_16_9 10
1473 #define FF_DTG_AFD_14_9 11
1474 #define FF_DTG_AFD_4_3_SP_14_9 13
1475 #define FF_DTG_AFD_16_9_SP_14_9 14
1476 #define FF_DTG_AFD_SP_4_3 15
1479 * maximum motion estimation search range in subpel units
1480 * If 0 then no limit.
1482 * - encoding: Set by user.
1483 * - decoding: unused
1488 * intra quantizer bias
1489 * - encoding: Set by user.
1490 * - decoding: unused
1492 int intra_quant_bias;
1493 #define FF_DEFAULT_QUANT_BIAS 999999
1496 * inter quantizer bias
1497 * - encoding: Set by user.
1498 * - decoding: unused
1500 int inter_quant_bias;
1504 * - encoding: unused
1505 * - decoding: Set by user.
1508 #define SLICE_FLAG_CODED_ORDER 0x0001 ///< draw_horiz_band() is called in coded order instead of display
1509 #define SLICE_FLAG_ALLOW_FIELD 0x0002 ///< allow draw_horiz_band() with field slices (MPEG2 field pics)
1510 #define SLICE_FLAG_ALLOW_PLANE 0x0004 ///< allow draw_horiz_band() with 1 component at a time (SVQ1)
1513 * XVideo Motion Acceleration
1514 * - encoding: forbidden
1515 * - decoding: set by decoder
1517 int xvmc_acceleration;
1520 * macroblock decision mode
1521 * - encoding: Set by user.
1522 * - decoding: unused
1525 #define FF_MB_DECISION_SIMPLE 0 ///< uses mb_cmp
1526 #define FF_MB_DECISION_BITS 1 ///< chooses the one which needs the fewest bits
1527 #define FF_MB_DECISION_RD 2 ///< rate distortion
1530 * custom intra quantization matrix
1531 * - encoding: Set by user, can be NULL.
1532 * - decoding: Set by libavcodec.
1534 uint16_t *intra_matrix;
1537 * custom inter quantization matrix
1538 * - encoding: Set by user, can be NULL.
1539 * - decoding: Set by libavcodec.
1541 uint16_t *inter_matrix;
1544 * scene change detection threshold
1545 * 0 is default, larger means fewer detected scene changes.
1546 * - encoding: Set by user.
1547 * - decoding: unused
1549 int scenechange_threshold;
1552 * noise reduction strength
1553 * - encoding: Set by user.
1554 * - decoding: unused
1556 int noise_reduction;
1559 * Motion estimation threshold below which no motion estimation is
1560 * performed, but instead the user specified motion vectors are used.
1562 * - encoding: Set by user.
1563 * - decoding: unused
1568 * Macroblock threshold below which the user specified macroblock types will be used.
1569 * - encoding: Set by user.
1570 * - decoding: unused
1575 * precision of the intra DC coefficient - 8
1576 * - encoding: Set by user.
1577 * - decoding: unused
1579 int intra_dc_precision;
1582 * Number of macroblock rows at the top which are skipped.
1583 * - encoding: unused
1584 * - decoding: Set by user.
1589 * Number of macroblock rows at the bottom which are skipped.
1590 * - encoding: unused
1591 * - decoding: Set by user.
1596 * Border processing masking, raises the quantizer for mbs on the borders
1598 * - encoding: Set by user.
1599 * - decoding: unused
1601 float border_masking;
1604 * minimum MB lagrange multipler
1605 * - encoding: Set by user.
1606 * - decoding: unused
1611 * maximum MB lagrange multipler
1612 * - encoding: Set by user.
1613 * - decoding: unused
1619 * - encoding: Set by user.
1620 * - decoding: unused
1622 int me_penalty_compensation;
1626 * - encoding: Set by user.
1627 * - decoding: unused
1633 * - encoding: Set by user.
1634 * - decoding: unused
1640 * - encoding: Set by user.
1641 * - decoding: unused
1646 * number of reference frames
1647 * - encoding: Set by user.
1648 * - decoding: Set by lavc.
1653 * chroma qp offset from luma
1654 * - encoding: Set by user.
1655 * - decoding: unused
1660 * Multiplied by qscale for each frame and added to scene_change_score.
1661 * - encoding: Set by user.
1662 * - decoding: unused
1664 int scenechange_factor;
1668 * Note: Value depends upon the compare function used for fullpel ME.
1669 * - encoding: Set by user.
1670 * - decoding: unused
1675 * Adjust sensitivity of b_frame_strategy 1.
1676 * - encoding: Set by user.
1677 * - decoding: unused
1682 * Chromaticity coordinates of the source primaries.
1683 * - encoding: Set by user
1684 * - decoding: Set by libavcodec
1686 enum AVColorPrimaries color_primaries;
1689 * Color Transfer Characteristic.
1690 * - encoding: Set by user
1691 * - decoding: Set by libavcodec
1693 enum AVColorTransferCharacteristic color_trc;
1696 * YUV colorspace type.
1697 * - encoding: Set by user
1698 * - decoding: Set by libavcodec
1700 enum AVColorSpace colorspace;
1703 * MPEG vs JPEG YUV range.
1704 * - encoding: Set by user
1705 * - decoding: Set by libavcodec
1707 enum AVColorRange color_range;
1710 * This defines the location of chroma samples.
1711 * - encoding: Set by user
1712 * - decoding: Set by libavcodec
1714 enum AVChromaLocation chroma_sample_location;
1718 * Indicates number of picture subdivisions. Used for parallelized
1720 * - encoding: Set by user
1721 * - decoding: unused
1726 * - encoding: set by libavcodec
1727 * - decoding: Set by libavcodec
1729 enum AVFieldOrder field_order;
1732 int sample_rate; ///< samples per second
1733 int channels; ///< number of audio channels
1736 * audio sample format
1737 * - encoding: Set by user.
1738 * - decoding: Set by libavcodec.
1740 enum AVSampleFormat sample_fmt; ///< sample format
1742 /* The following data should not be initialized. */
1744 * Number of samples per channel in an audio frame.
1746 * - encoding: set by libavcodec in avcodec_open2(). Each submitted frame
1747 * except the last must contain exactly frame_size samples per channel.
1748 * May be 0 when the codec has CODEC_CAP_VARIABLE_FRAME_SIZE set, then the
1749 * frame size is not restricted.
1750 * - decoding: may be set by some decoders to indicate constant frame size
1755 * Frame counter, set by libavcodec.
1757 * - decoding: total number of frames returned from the decoder so far.
1758 * - encoding: total number of frames passed to the encoder so far.
1760 * @note the counter is not incremented if encoding/decoding resulted in
1766 * number of bytes per packet if constant and known or 0
1767 * Used by some WAV based audio codecs.
1772 * Audio cutoff bandwidth (0 means "automatic")
1773 * - encoding: Set by user.
1774 * - decoding: unused
1778 #if FF_API_REQUEST_CHANNELS
1780 * Decoder should decode to this many channels if it can (0 for default)
1781 * - encoding: unused
1782 * - decoding: Set by user.
1783 * @deprecated Deprecated in favor of request_channel_layout.
1785 attribute_deprecated int request_channels;
1789 * Audio channel layout.
1790 * - encoding: set by user.
1791 * - decoding: set by libavcodec.
1793 uint64_t channel_layout;
1796 * Request decoder to use this channel layout if it can (0 for default)
1797 * - encoding: unused
1798 * - decoding: Set by user.
1800 uint64_t request_channel_layout;
1803 * Type of service that the audio stream conveys.
1804 * - encoding: Set by user.
1805 * - decoding: Set by libavcodec.
1807 enum AVAudioServiceType audio_service_type;
1810 * Used to request a sample format from the decoder.
1811 * - encoding: unused.
1812 * - decoding: Set by user.
1814 enum AVSampleFormat request_sample_fmt;
1816 #if FF_API_GET_BUFFER
1818 * Called at the beginning of each frame to get a buffer for it.
1820 * The function will set AVFrame.data[], AVFrame.linesize[].
1821 * AVFrame.extended_data[] must also be set, but it should be the same as
1822 * AVFrame.data[] except for planar audio with more channels than can fit
1823 * in AVFrame.data[]. In that case, AVFrame.data[] shall still contain as
1824 * many data pointers as it can hold.
1826 * if CODEC_CAP_DR1 is not set then get_buffer() must call
1827 * avcodec_default_get_buffer() instead of providing buffers allocated by
1830 * AVFrame.data[] should be 32- or 16-byte-aligned unless the CPU doesn't
1831 * need it. avcodec_default_get_buffer() aligns the output buffer properly,
1832 * but if get_buffer() is overridden then alignment considerations should
1833 * be taken into account.
1835 * @see avcodec_default_get_buffer()
1839 * If pic.reference is set then the frame will be read later by libavcodec.
1840 * avcodec_align_dimensions2() should be used to find the required width and
1841 * height, as they normally need to be rounded up to the next multiple of 16.
1843 * If frame multithreading is used and thread_safe_callbacks is set,
1844 * it may be called from a different thread, but not from more than one at
1845 * once. Does not need to be reentrant.
1847 * @see release_buffer(), reget_buffer()
1848 * @see avcodec_align_dimensions2()
1852 * Decoders request a buffer of a particular size by setting
1853 * AVFrame.nb_samples prior to calling get_buffer(). The decoder may,
1854 * however, utilize only part of the buffer by setting AVFrame.nb_samples
1855 * to a smaller value in the output frame.
1857 * Decoders cannot use the buffer after returning from
1858 * avcodec_decode_audio4(), so they will not call release_buffer(), as it
1859 * is assumed to be released immediately upon return. In some rare cases,
1860 * a decoder may need to call get_buffer() more than once in a single
1861 * call to avcodec_decode_audio4(). In that case, when get_buffer() is
1862 * called again after it has already been called once, the previously
1863 * acquired buffer is assumed to be released at that time and may not be
1864 * reused by the decoder.
1866 * As a convenience, av_samples_get_buffer_size() and
1867 * av_samples_fill_arrays() in libavutil may be used by custom get_buffer()
1868 * functions to find the required data size and to fill data pointers and
1869 * linesize. In AVFrame.linesize, only linesize[0] may be set for audio
1870 * since all planes must be the same size.
1872 * @see av_samples_get_buffer_size(), av_samples_fill_arrays()
1874 * - encoding: unused
1875 * - decoding: Set by libavcodec, user can override.
1877 * @deprecated use get_buffer2()
1879 attribute_deprecated
1880 int (*get_buffer)(struct AVCodecContext *c, AVFrame *pic);
1883 * Called to release buffers which were allocated with get_buffer.
1884 * A released buffer can be reused in get_buffer().
1885 * pic.data[*] must be set to NULL.
1886 * May be called from a different thread if frame multithreading is used,
1887 * but not by more than one thread at once, so does not need to be reentrant.
1888 * - encoding: unused
1889 * - decoding: Set by libavcodec, user can override.
1891 * @deprecated custom freeing callbacks should be set from get_buffer2()
1893 attribute_deprecated
1894 void (*release_buffer)(struct AVCodecContext *c, AVFrame *pic);
1897 * Called at the beginning of a frame to get cr buffer for it.
1898 * Buffer type (size, hints) must be the same. libavcodec won't check it.
1899 * libavcodec will pass previous buffer in pic, function should return
1900 * same buffer or new buffer with old frame "painted" into it.
1901 * If pic.data[0] == NULL must behave like get_buffer().
1902 * if CODEC_CAP_DR1 is not set then reget_buffer() must call
1903 * avcodec_default_reget_buffer() instead of providing buffers allocated by
1905 * - encoding: unused
1906 * - decoding: Set by libavcodec, user can override.
1908 attribute_deprecated
1909 int (*reget_buffer)(struct AVCodecContext *c, AVFrame *pic);
1913 * This callback is called at the beginning of each frame to get data
1914 * buffer(s) for it. There may be one contiguous buffer for all the data or
1915 * there may be a buffer per each data plane or anything in between. What
1916 * this means is, you may set however many entries in buf[] you feel necessary.
1917 * Each buffer must be reference-counted using the AVBuffer API (see description
1920 * The following fields will be set in the frame before this callback is
1923 * - width, height (video only)
1924 * - sample_rate, channel_layout, nb_samples (audio only)
1925 * Their values may differ from the corresponding values in
1926 * AVCodecContext. This callback must use the frame values, not the codec
1927 * context values, to calculate the required buffer size.
1929 * This callback must fill the following fields in the frame:
1933 * * if the data is planar audio with more than 8 channels, then this
1934 * callback must allocate and fill extended_data to contain all pointers
1935 * to all data planes. data[] must hold as many pointers as it can.
1936 * extended_data must be allocated with av_malloc() and will be freed in
1938 * * otherwise exended_data must point to data
1939 * - buf[] must contain one or more pointers to AVBufferRef structures. Each of
1940 * the frame's data and extended_data pointers must be contained in these. That
1941 * is, one AVBufferRef for each allocated chunk of memory, not necessarily one
1942 * AVBufferRef per data[] entry. See: av_buffer_create(), av_buffer_alloc(),
1943 * and av_buffer_ref().
1944 * - extended_buf and nb_extended_buf must be allocated with av_malloc() by
1945 * this callback and filled with the extra buffers if there are more
1946 * buffers than buf[] can hold. extended_buf will be freed in
1949 * If CODEC_CAP_DR1 is not set then get_buffer2() must call
1950 * avcodec_default_get_buffer2() instead of providing buffers allocated by
1953 * Each data plane must be aligned to the maximum required by the target
1956 * @see avcodec_default_get_buffer2()
1960 * If AV_GET_BUFFER_FLAG_REF is set in flags then the frame may be reused
1961 * (read and/or written to if it is writable) later by libavcodec.
1963 * If CODEC_FLAG_EMU_EDGE is not set in s->flags, the buffer must contain an
1964 * edge of the size returned by avcodec_get_edge_width() on all sides.
1966 * avcodec_align_dimensions2() should be used to find the required width and
1967 * height, as they normally need to be rounded up to the next multiple of 16.
1969 * If frame multithreading is used and thread_safe_callbacks is set,
1970 * this callback may be called from a different thread, but not from more
1971 * than one at once. Does not need to be reentrant.
1973 * @see avcodec_align_dimensions2()
1977 * Decoders request a buffer of a particular size by setting
1978 * AVFrame.nb_samples prior to calling get_buffer2(). The decoder may,
1979 * however, utilize only part of the buffer by setting AVFrame.nb_samples
1980 * to a smaller value in the output frame.
1982 * As a convenience, av_samples_get_buffer_size() and
1983 * av_samples_fill_arrays() in libavutil may be used by custom get_buffer2()
1984 * functions to find the required data size and to fill data pointers and
1985 * linesize. In AVFrame.linesize, only linesize[0] may be set for audio
1986 * since all planes must be the same size.
1988 * @see av_samples_get_buffer_size(), av_samples_fill_arrays()
1990 * - encoding: unused
1991 * - decoding: Set by libavcodec, user can override.
1993 int (*get_buffer2)(struct AVCodecContext *s, AVFrame *frame, int flags);
1996 * If non-zero, the decoded audio and video frames returned from
1997 * avcodec_decode_video2() and avcodec_decode_audio4() are reference-counted
1998 * and are valid indefinitely. The caller must free them with
1999 * av_frame_unref() when they are not needed anymore.
2000 * Otherwise, the decoded frames must not be freed by the caller and are
2001 * only valid until the next decode call.
2003 * - encoding: unused
2004 * - decoding: set by the caller before avcodec_open2().
2006 int refcounted_frames;
2008 /* - encoding parameters */
2009 float qcompress; ///< amount of qscale change between easy & hard scenes (0.0-1.0)
2010 float qblur; ///< amount of qscale smoothing over time (0.0-1.0)
2014 * - encoding: Set by user.
2015 * - decoding: unused
2021 * - encoding: Set by user.
2022 * - decoding: unused
2027 * maximum quantizer difference between frames
2028 * - encoding: Set by user.
2029 * - decoding: unused
2034 * ratecontrol qmin qmax limiting method
2035 * 0-> clipping, 1-> use a nice continuous function to limit qscale wthin qmin/qmax.
2036 * - encoding: Set by user.
2037 * - decoding: unused
2045 * decoder bitstream buffer size
2046 * - encoding: Set by user.
2047 * - decoding: unused
2052 * ratecontrol override, see RcOverride
2053 * - encoding: Allocated/set/freed by user.
2054 * - decoding: unused
2056 int rc_override_count;
2057 RcOverride *rc_override;
2060 * rate control equation
2061 * - encoding: Set by user
2062 * - decoding: unused
2068 * - encoding: Set by user.
2069 * - decoding: unused
2075 * - encoding: Set by user.
2076 * - decoding: unused
2080 float rc_buffer_aggressivity;
2083 * initial complexity for pass1 ratecontrol
2084 * - encoding: Set by user.
2085 * - decoding: unused
2087 float rc_initial_cplx;
2090 * Ratecontrol attempt to use, at maximum, <value> of what can be used without an underflow.
2091 * - encoding: Set by user.
2092 * - decoding: unused.
2094 float rc_max_available_vbv_use;
2097 * Ratecontrol attempt to use, at least, <value> times the amount needed to prevent a vbv overflow.
2098 * - encoding: Set by user.
2099 * - decoding: unused.
2101 float rc_min_vbv_overflow_use;
2104 * Number of bits which should be loaded into the rc buffer before decoding starts.
2105 * - encoding: Set by user.
2106 * - decoding: unused
2108 int rc_initial_buffer_occupancy;
2110 #define FF_CODER_TYPE_VLC 0
2111 #define FF_CODER_TYPE_AC 1
2112 #define FF_CODER_TYPE_RAW 2
2113 #define FF_CODER_TYPE_RLE 3
2114 #define FF_CODER_TYPE_DEFLATE 4
2117 * - encoding: Set by user.
2118 * - decoding: unused
2124 * - encoding: Set by user.
2125 * - decoding: unused
2130 * minimum Lagrange multipler
2131 * - encoding: Set by user.
2132 * - decoding: unused
2137 * maximum Lagrange multipler
2138 * - encoding: Set by user.
2139 * - decoding: unused
2144 * frame skip threshold
2145 * - encoding: Set by user.
2146 * - decoding: unused
2148 int frame_skip_threshold;
2152 * - encoding: Set by user.
2153 * - decoding: unused
2155 int frame_skip_factor;
2158 * frame skip exponent
2159 * - encoding: Set by user.
2160 * - decoding: unused
2165 * frame skip comparison function
2166 * - encoding: Set by user.
2167 * - decoding: unused
2172 * trellis RD quantization
2173 * - encoding: Set by user.
2174 * - decoding: unused
2179 * - encoding: Set by user.
2180 * - decoding: unused
2182 int min_prediction_order;
2185 * - encoding: Set by user.
2186 * - decoding: unused
2188 int max_prediction_order;
2191 * GOP timecode frame start number, in non drop frame format
2192 * - encoding: Set by user.
2193 * - decoding: unused
2195 int64_t timecode_frame_start;
2197 /* The RTP callback: This function is called */
2198 /* every time the encoder has a packet to send. */
2199 /* It depends on the encoder if the data starts */
2200 /* with a Start Code (it should). H.263 does. */
2201 /* mb_nb contains the number of macroblocks */
2202 /* encoded in the RTP payload. */
2203 void (*rtp_callback)(struct AVCodecContext *avctx, void *data, int size, int mb_nb);
2205 int rtp_payload_size; /* The size of the RTP payload: the coder will */
2206 /* do its best to deliver a chunk with size */
2207 /* below rtp_payload_size, the chunk will start */
2208 /* with a start code on some codecs like H.263. */
2209 /* This doesn't take account of any particular */
2210 /* headers inside the transmitted RTP payload. */
2212 /* statistics, used for 2-pass encoding */
2223 * number of bits used for the previously encoded frame
2224 * - encoding: Set by libavcodec.
2225 * - decoding: unused
2230 * pass1 encoding statistics output buffer
2231 * - encoding: Set by libavcodec.
2232 * - decoding: unused
2237 * pass2 encoding statistics input buffer
2238 * Concatenated stuff from stats_out of pass1 should be placed here.
2239 * - encoding: Allocated/set/freed by user.
2240 * - decoding: unused
2245 * Work around bugs in encoders which sometimes cannot be detected automatically.
2246 * - encoding: Set by user
2247 * - decoding: Set by user
2249 int workaround_bugs;
2250 #define FF_BUG_AUTODETECT 1 ///< autodetection
2251 #define FF_BUG_OLD_MSMPEG4 2
2252 #define FF_BUG_XVID_ILACE 4
2253 #define FF_BUG_UMP4 8
2254 #define FF_BUG_NO_PADDING 16
2255 #define FF_BUG_AMV 32
2256 #define FF_BUG_AC_VLC 0 ///< Will be removed, libavcodec can now handle these non-compliant files by default.
2257 #define FF_BUG_QPEL_CHROMA 64
2258 #define FF_BUG_STD_QPEL 128
2259 #define FF_BUG_QPEL_CHROMA2 256
2260 #define FF_BUG_DIRECT_BLOCKSIZE 512
2261 #define FF_BUG_EDGE 1024
2262 #define FF_BUG_HPEL_CHROMA 2048
2263 #define FF_BUG_DC_CLIP 4096
2264 #define FF_BUG_MS 8192 ///< Work around various bugs in Microsoft's broken decoders.
2265 #define FF_BUG_TRUNCATED 16384
2268 * strictly follow the standard (MPEG4, ...).
2269 * - encoding: Set by user.
2270 * - decoding: Set by user.
2271 * Setting this to STRICT or higher means the encoder and decoder will
2272 * generally do stupid things, whereas setting it to unofficial or lower
2273 * will mean the encoder might produce output that is not supported by all
2274 * spec-compliant decoders. Decoders don't differentiate between normal,
2275 * unofficial and experimental (that is, they always try to decode things
2276 * when they can) unless they are explicitly asked to behave stupidly
2277 * (=strictly conform to the specs)
2279 int strict_std_compliance;
2280 #define FF_COMPLIANCE_VERY_STRICT 2 ///< Strictly conform to an older more strict version of the spec or reference software.
2281 #define FF_COMPLIANCE_STRICT 1 ///< Strictly conform to all the things in the spec no matter what consequences.
2282 #define FF_COMPLIANCE_NORMAL 0
2283 #define FF_COMPLIANCE_UNOFFICIAL -1 ///< Allow unofficial extensions
2284 #define FF_COMPLIANCE_EXPERIMENTAL -2 ///< Allow nonstandardized experimental things.
2287 * error concealment flags
2288 * - encoding: unused
2289 * - decoding: Set by user.
2291 int error_concealment;
2292 #define FF_EC_GUESS_MVS 1
2293 #define FF_EC_DEBLOCK 2
2297 * - encoding: Set by user.
2298 * - decoding: Set by user.
2301 #define FF_DEBUG_PICT_INFO 1
2302 #define FF_DEBUG_RC 2
2303 #define FF_DEBUG_BITSTREAM 4
2304 #define FF_DEBUG_MB_TYPE 8
2305 #define FF_DEBUG_QP 16
2306 #define FF_DEBUG_MV 32
2307 #define FF_DEBUG_DCT_COEFF 0x00000040
2308 #define FF_DEBUG_SKIP 0x00000080
2309 #define FF_DEBUG_STARTCODE 0x00000100
2310 #define FF_DEBUG_PTS 0x00000200
2311 #define FF_DEBUG_ER 0x00000400
2312 #define FF_DEBUG_MMCO 0x00000800
2313 #define FF_DEBUG_BUGS 0x00001000
2314 #define FF_DEBUG_VIS_QP 0x00002000
2315 #define FF_DEBUG_VIS_MB_TYPE 0x00004000
2316 #define FF_DEBUG_BUFFERS 0x00008000
2317 #define FF_DEBUG_THREADS 0x00010000
2321 * - encoding: Set by user.
2322 * - decoding: Set by user.
2325 #define FF_DEBUG_VIS_MV_P_FOR 0x00000001 //visualize forward predicted MVs of P frames
2326 #define FF_DEBUG_VIS_MV_B_FOR 0x00000002 //visualize forward predicted MVs of B frames
2327 #define FF_DEBUG_VIS_MV_B_BACK 0x00000004 //visualize backward predicted MVs of B frames
2330 * Error recognition; may misdetect some more or less valid parts as errors.
2331 * - encoding: unused
2332 * - decoding: Set by user.
2334 int err_recognition;
2337 * Verify checksums embedded in the bitstream (could be of either encoded or
2338 * decoded data, depending on the codec) and print an error message on mismatch.
2339 * If AV_EF_EXPLODE is also set, a mismatching checksum will result in the
2340 * decoder returning an error.
2342 #define AV_EF_CRCCHECK (1<<0)
2343 #define AV_EF_BITSTREAM (1<<1)
2344 #define AV_EF_BUFFER (1<<2)
2345 #define AV_EF_EXPLODE (1<<3)
2348 * opaque 64bit number (generally a PTS) that will be reordered and
2349 * output in AVFrame.reordered_opaque
2350 * @deprecated in favor of pkt_pts
2351 * - encoding: unused
2352 * - decoding: Set by user.
2354 int64_t reordered_opaque;
2357 * Hardware accelerator in use
2358 * - encoding: unused.
2359 * - decoding: Set by libavcodec
2361 struct AVHWAccel *hwaccel;
2364 * Hardware accelerator context.
2365 * For some hardware accelerators, a global context needs to be
2366 * provided by the user. In that case, this holds display-dependent
2367 * data Libav cannot instantiate itself. Please refer to the
2368 * Libav HW accelerator documentation to know how to fill this
2369 * is. e.g. for VA API, this is a struct vaapi_context.
2370 * - encoding: unused
2371 * - decoding: Set by user
2373 void *hwaccel_context;
2377 * - encoding: Set by libavcodec if flags&CODEC_FLAG_PSNR.
2378 * - decoding: unused
2380 uint64_t error[AV_NUM_DATA_POINTERS];
2383 * DCT algorithm, see FF_DCT_* below
2384 * - encoding: Set by user.
2385 * - decoding: unused
2388 #define FF_DCT_AUTO 0
2389 #define FF_DCT_FASTINT 1
2390 #define FF_DCT_INT 2
2391 #define FF_DCT_MMX 3
2392 #define FF_DCT_ALTIVEC 5
2393 #define FF_DCT_FAAN 6
2396 * IDCT algorithm, see FF_IDCT_* below.
2397 * - encoding: Set by user.
2398 * - decoding: Set by user.
2401 #define FF_IDCT_AUTO 0
2402 #define FF_IDCT_INT 1
2403 #define FF_IDCT_SIMPLE 2
2404 #define FF_IDCT_SIMPLEMMX 3
2405 #define FF_IDCT_ARM 7
2406 #define FF_IDCT_ALTIVEC 8
2407 #define FF_IDCT_SH4 9
2408 #define FF_IDCT_SIMPLEARM 10
2409 #define FF_IDCT_IPP 13
2410 #define FF_IDCT_XVIDMMX 14
2411 #define FF_IDCT_SIMPLEARMV5TE 16
2412 #define FF_IDCT_SIMPLEARMV6 17
2413 #define FF_IDCT_SIMPLEVIS 18
2414 #define FF_IDCT_FAAN 20
2415 #define FF_IDCT_SIMPLENEON 22
2416 #define FF_IDCT_SIMPLEALPHA 23
2419 * bits per sample/pixel from the demuxer (needed for huffyuv).
2420 * - encoding: Set by libavcodec.
2421 * - decoding: Set by user.
2423 int bits_per_coded_sample;
2426 * Bits per sample/pixel of internal libavcodec pixel/sample format.
2427 * - encoding: set by user.
2428 * - decoding: set by libavcodec.
2430 int bits_per_raw_sample;
2434 * low resolution decoding, 1-> 1/2 size, 2->1/4 size
2435 * - encoding: unused
2436 * - decoding: Set by user.
2438 * @deprecated use decoder private options instead
2440 attribute_deprecated int lowres;
2444 * the picture in the bitstream
2445 * - encoding: Set by libavcodec.
2446 * - decoding: Set by libavcodec.
2448 AVFrame *coded_frame;
2452 * is used to decide how many independent tasks should be passed to execute()
2453 * - encoding: Set by user.
2454 * - decoding: Set by user.
2459 * Which multithreading methods to use.
2460 * Use of FF_THREAD_FRAME will increase decoding delay by one frame per thread,
2461 * so clients which cannot provide future frames should not use it.
2463 * - encoding: Set by user, otherwise the default is used.
2464 * - decoding: Set by user, otherwise the default is used.
2467 #define FF_THREAD_FRAME 1 ///< Decode more than one frame at once
2468 #define FF_THREAD_SLICE 2 ///< Decode more than one part of a single frame at once
2471 * Which multithreading methods are in use by the codec.
2472 * - encoding: Set by libavcodec.
2473 * - decoding: Set by libavcodec.
2475 int active_thread_type;
2478 * Set by the client if its custom get_buffer() callback can be called
2479 * synchronously from another thread, which allows faster multithreaded decoding.
2480 * draw_horiz_band() will be called from other threads regardless of this setting.
2481 * Ignored if the default get_buffer() is used.
2482 * - encoding: Set by user.
2483 * - decoding: Set by user.
2485 int thread_safe_callbacks;
2488 * The codec may call this to execute several independent things.
2489 * It will return only after finishing all tasks.
2490 * The user may replace this with some multithreaded implementation,
2491 * the default implementation will execute the parts serially.
2492 * @param count the number of things to execute
2493 * - encoding: Set by libavcodec, user can override.
2494 * - decoding: Set by libavcodec, user can override.
2496 int (*execute)(struct AVCodecContext *c, int (*func)(struct AVCodecContext *c2, void *arg), void *arg2, int *ret, int count, int size);
2499 * The codec may call this to execute several independent things.
2500 * It will return only after finishing all tasks.
2501 * The user may replace this with some multithreaded implementation,
2502 * the default implementation will execute the parts serially.
2503 * Also see avcodec_thread_init and e.g. the --enable-pthread configure option.
2504 * @param c context passed also to func
2505 * @param count the number of things to execute
2506 * @param arg2 argument passed unchanged to func
2507 * @param ret return values of executed functions, must have space for "count" values. May be NULL.
2508 * @param func function that will be called count times, with jobnr from 0 to count-1.
2509 * threadnr will be in the range 0 to c->thread_count-1 < MAX_THREADS and so that no
2510 * two instances of func executing at the same time will have the same threadnr.
2511 * @return always 0 currently, but code should handle a future improvement where when any call to func
2512 * returns < 0 no further calls to func may be done and < 0 is returned.
2513 * - encoding: Set by libavcodec, user can override.
2514 * - decoding: Set by libavcodec, user can override.
2516 int (*execute2)(struct AVCodecContext *c, int (*func)(struct AVCodecContext *c2, void *arg, int jobnr, int threadnr), void *arg2, int *ret, int count);
2520 * Can be used by execute() to store some per AVCodecContext stuff.
2521 * - encoding: set by execute()
2522 * - decoding: set by execute()
2524 void *thread_opaque;
2527 * noise vs. sse weight for the nsse comparsion function
2528 * - encoding: Set by user.
2529 * - decoding: unused
2535 * - encoding: Set by user.
2536 * - decoding: Set by libavcodec.
2539 #define FF_PROFILE_UNKNOWN -99
2540 #define FF_PROFILE_RESERVED -100
2542 #define FF_PROFILE_AAC_MAIN 0
2543 #define FF_PROFILE_AAC_LOW 1
2544 #define FF_PROFILE_AAC_SSR 2
2545 #define FF_PROFILE_AAC_LTP 3
2546 #define FF_PROFILE_AAC_HE 4
2547 #define FF_PROFILE_AAC_HE_V2 28
2548 #define FF_PROFILE_AAC_LD 22
2549 #define FF_PROFILE_AAC_ELD 38
2550 #define FF_PROFILE_MPEG2_AAC_LOW 128
2551 #define FF_PROFILE_MPEG2_AAC_HE 131
2553 #define FF_PROFILE_DTS 20
2554 #define FF_PROFILE_DTS_ES 30
2555 #define FF_PROFILE_DTS_96_24 40
2556 #define FF_PROFILE_DTS_HD_HRA 50
2557 #define FF_PROFILE_DTS_HD_MA 60
2559 #define FF_PROFILE_MPEG2_422 0
2560 #define FF_PROFILE_MPEG2_HIGH 1
2561 #define FF_PROFILE_MPEG2_SS 2
2562 #define FF_PROFILE_MPEG2_SNR_SCALABLE 3
2563 #define FF_PROFILE_MPEG2_MAIN 4
2564 #define FF_PROFILE_MPEG2_SIMPLE 5
2566 #define FF_PROFILE_H264_CONSTRAINED (1<<9) // 8+1; constraint_set1_flag
2567 #define FF_PROFILE_H264_INTRA (1<<11) // 8+3; constraint_set3_flag
2569 #define FF_PROFILE_H264_BASELINE 66
2570 #define FF_PROFILE_H264_CONSTRAINED_BASELINE (66|FF_PROFILE_H264_CONSTRAINED)
2571 #define FF_PROFILE_H264_MAIN 77
2572 #define FF_PROFILE_H264_EXTENDED 88
2573 #define FF_PROFILE_H264_HIGH 100
2574 #define FF_PROFILE_H264_HIGH_10 110
2575 #define FF_PROFILE_H264_HIGH_10_INTRA (110|FF_PROFILE_H264_INTRA)
2576 #define FF_PROFILE_H264_HIGH_422 122
2577 #define FF_PROFILE_H264_HIGH_422_INTRA (122|FF_PROFILE_H264_INTRA)
2578 #define FF_PROFILE_H264_HIGH_444 144
2579 #define FF_PROFILE_H264_HIGH_444_PREDICTIVE 244
2580 #define FF_PROFILE_H264_HIGH_444_INTRA (244|FF_PROFILE_H264_INTRA)
2581 #define FF_PROFILE_H264_CAVLC_444 44
2583 #define FF_PROFILE_VC1_SIMPLE 0
2584 #define FF_PROFILE_VC1_MAIN 1
2585 #define FF_PROFILE_VC1_COMPLEX 2
2586 #define FF_PROFILE_VC1_ADVANCED 3
2588 #define FF_PROFILE_MPEG4_SIMPLE 0
2589 #define FF_PROFILE_MPEG4_SIMPLE_SCALABLE 1
2590 #define FF_PROFILE_MPEG4_CORE 2
2591 #define FF_PROFILE_MPEG4_MAIN 3
2592 #define FF_PROFILE_MPEG4_N_BIT 4
2593 #define FF_PROFILE_MPEG4_SCALABLE_TEXTURE 5
2594 #define FF_PROFILE_MPEG4_SIMPLE_FACE_ANIMATION 6
2595 #define FF_PROFILE_MPEG4_BASIC_ANIMATED_TEXTURE 7
2596 #define FF_PROFILE_MPEG4_HYBRID 8
2597 #define FF_PROFILE_MPEG4_ADVANCED_REAL_TIME 9
2598 #define FF_PROFILE_MPEG4_CORE_SCALABLE 10
2599 #define FF_PROFILE_MPEG4_ADVANCED_CODING 11
2600 #define FF_PROFILE_MPEG4_ADVANCED_CORE 12
2601 #define FF_PROFILE_MPEG4_ADVANCED_SCALABLE_TEXTURE 13
2602 #define FF_PROFILE_MPEG4_SIMPLE_STUDIO 14
2603 #define FF_PROFILE_MPEG4_ADVANCED_SIMPLE 15
2605 #define FF_PROFILE_JPEG2000_CSTREAM_RESTRICTION_0 0
2606 #define FF_PROFILE_JPEG2000_CSTREAM_RESTRICTION_1 1
2607 #define FF_PROFILE_JPEG2000_CSTREAM_NO_RESTRICTION 2
2608 #define FF_PROFILE_JPEG2000_DCINEMA_2K 3
2609 #define FF_PROFILE_JPEG2000_DCINEMA_4K 4
2613 * - encoding: Set by user.
2614 * - decoding: Set by libavcodec.
2617 #define FF_LEVEL_UNKNOWN -99
2621 * - encoding: unused
2622 * - decoding: Set by user.
2624 enum AVDiscard skip_loop_filter;
2628 * - encoding: unused
2629 * - decoding: Set by user.
2631 enum AVDiscard skip_idct;
2635 * - encoding: unused
2636 * - decoding: Set by user.
2638 enum AVDiscard skip_frame;
2641 * Header containing style information for text subtitles.
2642 * For SUBTITLE_ASS subtitle type, it should contain the whole ASS
2643 * [Script Info] and [V4+ Styles] section, plus the [Events] line and
2644 * the Format line following. It shouldn't include any Dialogue line.
2645 * - encoding: Set/allocated/freed by user (before avcodec_open2())
2646 * - decoding: Set/allocated/freed by libavcodec (by avcodec_open2())
2648 uint8_t *subtitle_header;
2649 int subtitle_header_size;
2652 * Simulates errors in the bitstream to test error concealment.
2653 * - encoding: Set by user.
2654 * - decoding: unused
2659 * Current packet as passed into the decoder, to avoid having
2660 * to pass the packet into every function. Currently only valid
2661 * inside lavc and get/release_buffer callbacks.
2662 * - decoding: set by avcodec_decode_*, read by get_buffer() for setting pkt_pts
2663 * - encoding: unused
2668 * VBV delay coded in the last frame (in periods of a 27 MHz clock).
2669 * Used for compliant TS muxing.
2670 * - encoding: Set by libavcodec.
2671 * - decoding: unused.
2679 typedef struct AVProfile {
2681 const char *name; ///< short name for the profile
2684 typedef struct AVCodecDefault AVCodecDefault;
2691 typedef struct AVCodec {
2693 * Name of the codec implementation.
2694 * The name is globally unique among encoders and among decoders (but an
2695 * encoder and a decoder can share the same name).
2696 * This is the primary way to find a codec from the user perspective.
2700 * Descriptive name for the codec, meant to be more human readable than name.
2701 * You should use the NULL_IF_CONFIG_SMALL() macro to define it.
2703 const char *long_name;
2704 enum AVMediaType type;
2707 * Codec capabilities.
2711 const AVRational *supported_framerates; ///< array of supported framerates, or NULL if any, array is terminated by {0,0}
2712 const enum AVPixelFormat *pix_fmts; ///< array of supported pixel formats, or NULL if unknown, array is terminated by -1
2713 const int *supported_samplerates; ///< array of supported audio samplerates, or NULL if unknown, array is terminated by 0
2714 const enum AVSampleFormat *sample_fmts; ///< array of supported sample formats, or NULL if unknown, array is terminated by -1
2715 const uint64_t *channel_layouts; ///< array of support channel layouts, or NULL if unknown. array is terminated by 0
2717 attribute_deprecated uint8_t max_lowres; ///< maximum value for lowres supported by the decoder
2719 const AVClass *priv_class; ///< AVClass for the private context
2720 const AVProfile *profiles; ///< array of recognized profiles, or NULL if unknown, array is terminated by {FF_PROFILE_UNKNOWN}
2722 /*****************************************************************
2723 * No fields below this line are part of the public API. They
2724 * may not be used outside of libavcodec and can be changed and
2726 * New public fields should be added right above.
2727 *****************************************************************
2730 struct AVCodec *next;
2732 * @name Frame-level threading support functions
2736 * If defined, called on thread contexts when they are created.
2737 * If the codec allocates writable tables in init(), re-allocate them here.
2738 * priv_data will be set to a copy of the original.
2740 int (*init_thread_copy)(AVCodecContext *);
2742 * Copy necessary context variables from a previous thread context to the current one.
2743 * If not defined, the next thread will start automatically; otherwise, the codec
2744 * must call ff_thread_finish_setup().
2746 * dst and src will (rarely) point to the same context, in which case memcpy should be skipped.
2748 int (*update_thread_context)(AVCodecContext *dst, const AVCodecContext *src);
2752 * Private codec-specific defaults.
2754 const AVCodecDefault *defaults;
2757 * Initialize codec static data, called from avcodec_register().
2759 void (*init_static_data)(struct AVCodec *codec);
2761 int (*init)(AVCodecContext *);
2762 int (*encode_sub)(AVCodecContext *, uint8_t *buf, int buf_size,
2763 const struct AVSubtitle *sub);
2765 * Encode data to an AVPacket.
2767 * @param avctx codec context
2768 * @param avpkt output AVPacket (may contain a user-provided buffer)
2769 * @param[in] frame AVFrame containing the raw data to be encoded
2770 * @param[out] got_packet_ptr encoder sets to 0 or 1 to indicate that a
2771 * non-empty packet was returned in avpkt.
2772 * @return 0 on success, negative error code on failure
2774 int (*encode2)(AVCodecContext *avctx, AVPacket *avpkt, const AVFrame *frame,
2775 int *got_packet_ptr);
2776 int (*decode)(AVCodecContext *, void *outdata, int *outdata_size, AVPacket *avpkt);
2777 int (*close)(AVCodecContext *);
2780 * Will be called when seeking
2782 void (*flush)(AVCodecContext *);
2788 typedef struct AVHWAccel {
2790 * Name of the hardware accelerated codec.
2791 * The name is globally unique among encoders and among decoders (but an
2792 * encoder and a decoder can share the same name).
2797 * Type of codec implemented by the hardware accelerator.
2799 * See AVMEDIA_TYPE_xxx
2801 enum AVMediaType type;
2804 * Codec implemented by the hardware accelerator.
2806 * See AV_CODEC_ID_xxx
2811 * Supported pixel format.
2813 * Only hardware accelerated formats are supported here.
2815 enum AVPixelFormat pix_fmt;
2818 * Hardware accelerated codec capabilities.
2819 * see FF_HWACCEL_CODEC_CAP_*
2823 struct AVHWAccel *next;
2826 * Called at the beginning of each frame or field picture.
2828 * Meaningful frame information (codec specific) is guaranteed to
2829 * be parsed at this point. This function is mandatory.
2831 * Note that buf can be NULL along with buf_size set to 0.
2832 * Otherwise, this means the whole frame is available at this point.
2834 * @param avctx the codec context
2835 * @param buf the frame data buffer base
2836 * @param buf_size the size of the frame in bytes
2837 * @return zero if successful, a negative value otherwise
2839 int (*start_frame)(AVCodecContext *avctx, const uint8_t *buf, uint32_t buf_size);
2842 * Callback for each slice.
2844 * Meaningful slice information (codec specific) is guaranteed to
2845 * be parsed at this point. This function is mandatory.
2847 * @param avctx the codec context
2848 * @param buf the slice data buffer base
2849 * @param buf_size the size of the slice in bytes
2850 * @return zero if successful, a negative value otherwise
2852 int (*decode_slice)(AVCodecContext *avctx, const uint8_t *buf, uint32_t buf_size);
2855 * Called at the end of each frame or field picture.
2857 * The whole picture is parsed at this point and can now be sent
2858 * to the hardware accelerator. This function is mandatory.
2860 * @param avctx the codec context
2861 * @return zero if successful, a negative value otherwise
2863 int (*end_frame)(AVCodecContext *avctx);
2866 * Size of HW accelerator private data.
2868 * Private data is allocated with av_mallocz() before
2869 * AVCodecContext.get_buffer() and deallocated after
2870 * AVCodecContext.release_buffer().
2876 * @defgroup lavc_picture AVPicture
2878 * Functions for working with AVPicture
2883 * four components are given, that's all.
2884 * the last component is alpha
2886 typedef struct AVPicture {
2887 uint8_t *data[AV_NUM_DATA_POINTERS];
2888 int linesize[AV_NUM_DATA_POINTERS]; ///< number of bytes per line
2895 #define AVPALETTE_SIZE 1024
2896 #define AVPALETTE_COUNT 256
2898 enum AVSubtitleType {
2901 SUBTITLE_BITMAP, ///< A bitmap, pict will be set
2904 * Plain text, the text field must be set by the decoder and is
2905 * authoritative. ass and pict fields may contain approximations.
2910 * Formatted text, the ass field must be set by the decoder and is
2911 * authoritative. pict and text fields may contain approximations.
2916 #define AV_SUBTITLE_FLAG_FORCED 0x00000001
2918 typedef struct AVSubtitleRect {
2919 int x; ///< top left corner of pict, undefined when pict is not set
2920 int y; ///< top left corner of pict, undefined when pict is not set
2921 int w; ///< width of pict, undefined when pict is not set
2922 int h; ///< height of pict, undefined when pict is not set
2923 int nb_colors; ///< number of colors in pict, undefined when pict is not set
2926 * data+linesize for the bitmap of this subtitle.
2927 * can be set for text/ass as well once they where rendered
2930 enum AVSubtitleType type;
2932 char *text; ///< 0 terminated plain UTF-8 text
2935 * 0 terminated ASS/SSA compatible event line.
2936 * The pressentation of this is unaffected by the other values in this
2943 typedef struct AVSubtitle {
2944 uint16_t format; /* 0 = graphics */
2945 uint32_t start_display_time; /* relative to packet pts, in ms */
2946 uint32_t end_display_time; /* relative to packet pts, in ms */
2948 AVSubtitleRect **rects;
2949 int64_t pts; ///< Same as packet pts, in AV_TIME_BASE
2953 * If c is NULL, returns the first registered codec,
2954 * if c is non-NULL, returns the next registered codec after c,
2955 * or NULL if c is the last one.
2957 AVCodec *av_codec_next(const AVCodec *c);
2960 * Return the LIBAVCODEC_VERSION_INT constant.
2962 unsigned avcodec_version(void);
2965 * Return the libavcodec build-time configuration.
2967 const char *avcodec_configuration(void);
2970 * Return the libavcodec license.
2972 const char *avcodec_license(void);
2975 * Register the codec codec and initialize libavcodec.
2977 * @warning either this function or avcodec_register_all() must be called
2978 * before any other libavcodec functions.
2980 * @see avcodec_register_all()
2982 void avcodec_register(AVCodec *codec);
2985 * Register all the codecs, parsers and bitstream filters which were enabled at
2986 * configuration time. If you do not call this function you can select exactly
2987 * which formats you want to support, by using the individual registration
2990 * @see avcodec_register
2991 * @see av_register_codec_parser
2992 * @see av_register_bitstream_filter
2994 void avcodec_register_all(void);
2997 * Allocate an AVCodecContext and set its fields to default values. The
2998 * resulting struct can be deallocated by calling avcodec_close() on it followed
3001 * @param codec if non-NULL, allocate private data and initialize defaults
3002 * for the given codec. It is illegal to then call avcodec_open2()
3003 * with a different codec.
3004 * If NULL, then the codec-specific defaults won't be initialized,
3005 * which may result in suboptimal default settings (this is
3006 * important mainly for encoders, e.g. libx264).
3008 * @return An AVCodecContext filled with default values or NULL on failure.
3009 * @see avcodec_get_context_defaults
3011 AVCodecContext *avcodec_alloc_context3(const AVCodec *codec);
3014 * Set the fields of the given AVCodecContext to default values corresponding
3015 * to the given codec (defaults may be codec-dependent).
3017 * Do not call this function if a non-NULL codec has been passed
3018 * to avcodec_alloc_context3() that allocated this AVCodecContext.
3019 * If codec is non-NULL, it is illegal to call avcodec_open2() with a
3020 * different codec on this AVCodecContext.
3022 int avcodec_get_context_defaults3(AVCodecContext *s, const AVCodec *codec);
3025 * Get the AVClass for AVCodecContext. It can be used in combination with
3026 * AV_OPT_SEARCH_FAKE_OBJ for examining options.
3028 * @see av_opt_find().
3030 const AVClass *avcodec_get_class(void);
3033 * Copy the settings of the source AVCodecContext into the destination
3034 * AVCodecContext. The resulting destination codec context will be
3035 * unopened, i.e. you are required to call avcodec_open2() before you
3036 * can use this AVCodecContext to decode/encode video/audio data.
3038 * @param dest target codec context, should be initialized with
3039 * avcodec_alloc_context3(), but otherwise uninitialized
3040 * @param src source codec context
3041 * @return AVERROR() on error (e.g. memory allocation error), 0 on success
3043 int avcodec_copy_context(AVCodecContext *dest, const AVCodecContext *src);
3046 * Allocate an AVFrame and set its fields to default values. The resulting
3047 * struct must be freed using avcodec_free_frame().
3049 * @return An AVFrame filled with default values or NULL on failure.
3050 * @see avcodec_get_frame_defaults
3052 AVFrame *avcodec_alloc_frame(void);
3055 * Set the fields of the given AVFrame to default values.
3057 * @param frame The AVFrame of which the fields should be set to default values.
3059 void avcodec_get_frame_defaults(AVFrame *frame);
3062 * Free the frame and any dynamically allocated objects in it,
3063 * e.g. extended_data.
3065 * @param frame frame to be freed. The pointer will be set to NULL.
3067 * @warning this function does NOT free the data buffers themselves
3068 * (it does not know how, since they might have been allocated with
3069 * a custom get_buffer()).
3071 void avcodec_free_frame(AVFrame **frame);
3074 * Initialize the AVCodecContext to use the given AVCodec. Prior to using this
3075 * function the context has to be allocated with avcodec_alloc_context3().
3077 * The functions avcodec_find_decoder_by_name(), avcodec_find_encoder_by_name(),
3078 * avcodec_find_decoder() and avcodec_find_encoder() provide an easy way for
3079 * retrieving a codec.
3081 * @warning This function is not thread safe!
3084 * avcodec_register_all();
3085 * av_dict_set(&opts, "b", "2.5M", 0);
3086 * codec = avcodec_find_decoder(AV_CODEC_ID_H264);
3090 * context = avcodec_alloc_context3(codec);
3092 * if (avcodec_open2(context, codec, opts) < 0)
3096 * @param avctx The context to initialize.
3097 * @param codec The codec to open this context for. If a non-NULL codec has been
3098 * previously passed to avcodec_alloc_context3() or
3099 * avcodec_get_context_defaults3() for this context, then this
3100 * parameter MUST be either NULL or equal to the previously passed
3102 * @param options A dictionary filled with AVCodecContext and codec-private options.
3103 * On return this object will be filled with options that were not found.
3105 * @return zero on success, a negative value on error
3106 * @see avcodec_alloc_context3(), avcodec_find_decoder(), avcodec_find_encoder(),
3107 * av_dict_set(), av_opt_find().
3109 int avcodec_open2(AVCodecContext *avctx, const AVCodec *codec, AVDictionary **options);
3112 * Close a given AVCodecContext and free all the data associated with it
3113 * (but not the AVCodecContext itself).
3115 * Calling this function on an AVCodecContext that hasn't been opened will free
3116 * the codec-specific data allocated in avcodec_alloc_context3() /
3117 * avcodec_get_context_defaults3() with a non-NULL codec. Subsequent calls will
3120 int avcodec_close(AVCodecContext *avctx);
3123 * Free all allocated data in the given subtitle struct.
3125 * @param sub AVSubtitle to free.
3127 void avsubtitle_free(AVSubtitle *sub);
3134 * @addtogroup lavc_packet
3138 #if FF_API_DESTRUCT_PACKET
3140 * Default packet destructor.
3141 * @deprecated use the AVBuffer API instead
3143 attribute_deprecated
3144 void av_destruct_packet(AVPacket *pkt);
3148 * Initialize optional fields of a packet with default values.
3150 * Note, this does not touch the data and size members, which have to be
3151 * initialized separately.
3155 void av_init_packet(AVPacket *pkt);
3158 * Allocate the payload of a packet and initialize its fields with
3162 * @param size wanted payload size
3163 * @return 0 if OK, AVERROR_xxx otherwise
3165 int av_new_packet(AVPacket *pkt, int size);
3168 * Reduce packet size, correctly zeroing padding
3171 * @param size new size
3173 void av_shrink_packet(AVPacket *pkt, int size);
3176 * Increase packet size, correctly zeroing padding
3179 * @param grow_by number of bytes by which to increase the size of the packet
3181 int av_grow_packet(AVPacket *pkt, int grow_by);
3184 * Initialize a reference-counted packet from av_malloc()ed data.
3186 * @param pkt packet to be initialized. This function will set the data, size,
3187 * buf and destruct fields, all others are left untouched.
3188 * @param data Data allocated by av_malloc() to be used as packet data. If this
3189 * function returns successfully, the data is owned by the underlying AVBuffer.
3190 * The caller may not access the data through other means.
3191 * @param size size of data in bytes, without the padding. I.e. the full buffer
3192 * size is assumed to be size + FF_INPUT_BUFFER_PADDING_SIZE.
3194 * @return 0 on success, a negative AVERROR on error
3196 int av_packet_from_data(AVPacket *pkt, uint8_t *data, int size);
3199 * @warning This is a hack - the packet memory allocation stuff is broken. The
3200 * packet is allocated if it was not really allocated.
3202 int av_dup_packet(AVPacket *pkt);
3207 * @param pkt packet to free
3209 void av_free_packet(AVPacket *pkt);
3212 * Allocate new information of a packet.
3215 * @param type side information type
3216 * @param size side information size
3217 * @return pointer to fresh allocated data or NULL otherwise
3219 uint8_t* av_packet_new_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
3223 * Shrink the already allocated side data buffer
3226 * @param type side information type
3227 * @param size new side information size
3228 * @return 0 on success, < 0 on failure
3230 int av_packet_shrink_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
3234 * Get side information from packet.
3237 * @param type desired side information type
3238 * @param size pointer for side information size to store (optional)
3239 * @return pointer to data if present or NULL otherwise
3241 uint8_t* av_packet_get_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
3245 * Convenience function to free all the side data stored.
3246 * All the other fields stay untouched.
3250 void av_packet_free_side_data(AVPacket *pkt);
3253 * Setup a new reference to the data described by a given packet
3255 * If src is reference-counted, setup dst as a new reference to the
3256 * buffer in src. Otherwise allocate a new buffer in dst and copy the
3257 * data from src into it.
3259 * All the other fields are copied from src.
3261 * @see av_packet_unref
3263 * @param dst Destination packet
3264 * @param src Source packet
3266 * @return 0 on success, a negative AVERROR on error.
3268 int av_packet_ref(AVPacket *dst, AVPacket *src);
3273 * Unreference the buffer referenced by the packet and reset the
3274 * remaining packet fields to their default values.
3276 * @param pkt The packet to be unreferenced.
3278 void av_packet_unref(AVPacket *pkt);
3281 * Move every field in src to dst and reset src.
3283 * @see av_packet_unref
3285 * @param src Source packet, will be reset
3286 * @param dst Destination packet
3288 void av_packet_move_ref(AVPacket *dst, AVPacket *src);
3291 * Copy only "properties" fields from src to dst.
3293 * Properties for the purpose of this function are all the fields
3294 * beside those related to the packet data (buf, data, size)
3296 * @param dst Destination packet
3297 * @param src Source packet
3299 * @return 0 on success AVERROR on failure.
3302 int av_packet_copy_props(AVPacket *dst, const AVPacket *src);
3309 * @addtogroup lavc_decoding
3314 * Find a registered decoder with a matching codec ID.
3316 * @param id AVCodecID of the requested decoder
3317 * @return A decoder if one was found, NULL otherwise.
3319 AVCodec *avcodec_find_decoder(enum AVCodecID id);
3322 * Find a registered decoder with the specified name.
3324 * @param name name of the requested decoder
3325 * @return A decoder if one was found, NULL otherwise.
3327 AVCodec *avcodec_find_decoder_by_name(const char *name);
3329 #if FF_API_GET_BUFFER
3330 attribute_deprecated int avcodec_default_get_buffer(AVCodecContext *s, AVFrame *pic);
3331 attribute_deprecated void avcodec_default_release_buffer(AVCodecContext *s, AVFrame *pic);
3332 attribute_deprecated int avcodec_default_reget_buffer(AVCodecContext *s, AVFrame *pic);
3336 * The default callback for AVCodecContext.get_buffer2(). It is made public so
3337 * it can be called by custom get_buffer2() implementations for decoders without
3338 * CODEC_CAP_DR1 set.
3340 int avcodec_default_get_buffer2(AVCodecContext *s, AVFrame *frame, int flags);
3343 * Return the amount of padding in pixels which the get_buffer callback must
3344 * provide around the edge of the image for codecs which do not have the
3345 * CODEC_FLAG_EMU_EDGE flag.
3347 * @return Required padding in pixels.
3349 unsigned avcodec_get_edge_width(void);
3352 * Modify width and height values so that they will result in a memory
3353 * buffer that is acceptable for the codec if you do not use any horizontal
3356 * May only be used if a codec with CODEC_CAP_DR1 has been opened.
3357 * If CODEC_FLAG_EMU_EDGE is not set, the dimensions must have been increased
3358 * according to avcodec_get_edge_width() before.
3360 void avcodec_align_dimensions(AVCodecContext *s, int *width, int *height);
3363 * Modify width and height values so that they will result in a memory
3364 * buffer that is acceptable for the codec if you also ensure that all
3365 * line sizes are a multiple of the respective linesize_align[i].
3367 * May only be used if a codec with CODEC_CAP_DR1 has been opened.
3368 * If CODEC_FLAG_EMU_EDGE is not set, the dimensions must have been increased
3369 * according to avcodec_get_edge_width() before.
3371 void avcodec_align_dimensions2(AVCodecContext *s, int *width, int *height,
3372 int linesize_align[AV_NUM_DATA_POINTERS]);
3375 * Decode the audio frame of size avpkt->size from avpkt->data into frame.
3377 * Some decoders may support multiple frames in a single AVPacket. Such
3378 * decoders would then just decode the first frame and the return value would be
3379 * less than the packet size. In this case, avcodec_decode_audio4 has to be
3380 * called again with an AVPacket containing the remaining data in order to
3381 * decode the second frame, etc... Even if no frames are returned, the packet
3382 * needs to be fed to the decoder with remaining data until it is completely
3383 * consumed or an error occurs.
3385 * Some decoders (those marked with CODEC_CAP_DELAY) have a delay between input
3386 * and output. This means that for some packets they will not immediately
3387 * produce decoded output and need to be flushed at the end of decoding to get
3388 * all the decoded data. Flushing is done by calling this function with packets
3389 * with avpkt->data set to NULL and avpkt->size set to 0 until it stops
3390 * returning samples. It is safe to flush even those decoders that are not
3391 * marked with CODEC_CAP_DELAY, then no samples will be returned.
3393 * @warning The input buffer, avpkt->data must be FF_INPUT_BUFFER_PADDING_SIZE
3394 * larger than the actual read bytes because some optimized bitstream
3395 * readers read 32 or 64 bits at once and could read over the end.
3397 * @param avctx the codec context
3398 * @param[out] frame The AVFrame in which to store decoded audio samples.
3399 * The decoder will allocate a buffer for the decoded frame by
3400 * calling the AVCodecContext.get_buffer2() callback.
3401 * When AVCodecContext.refcounted_frames is set to 1, the frame is
3402 * reference counted and the returned reference belongs to the
3403 * caller. The caller must release the frame using av_frame_unref()
3404 * when the frame is no longer needed. The caller may safely write
3405 * to the frame if av_frame_is_writable() returns 1.
3406 * When AVCodecContext.refcounted_frames is set to 0, the returned
3407 * reference belongs to the decoder and is valid only until the
3408 * next call to this function or until closing or flushing the
3409 * decoder. The caller may not write to it.
3410 * @param[out] got_frame_ptr Zero if no frame could be decoded, otherwise it is
3411 * non-zero. Note that this field being set to zero
3412 * does not mean that an error has occurred. For
3413 * decoders with CODEC_CAP_DELAY set, no given decode
3414 * call is guaranteed to produce a frame.
3415 * @param[in] avpkt The input AVPacket containing the input buffer.
3416 * At least avpkt->data and avpkt->size should be set. Some
3417 * decoders might also require additional fields to be set.
3418 * @return A negative error code is returned if an error occurred during
3419 * decoding, otherwise the number of bytes consumed from the input
3420 * AVPacket is returned.
3422 int avcodec_decode_audio4(AVCodecContext *avctx, AVFrame *frame,
3423 int *got_frame_ptr, AVPacket *avpkt);
3426 * Decode the video frame of size avpkt->size from avpkt->data into picture.
3427 * Some decoders may support multiple frames in a single AVPacket, such
3428 * decoders would then just decode the first frame.
3430 * @warning The input buffer must be FF_INPUT_BUFFER_PADDING_SIZE larger than
3431 * the actual read bytes because some optimized bitstream readers read 32 or 64
3432 * bits at once and could read over the end.
3434 * @warning The end of the input buffer buf should be set to 0 to ensure that
3435 * no overreading happens for damaged MPEG streams.
3437 * @note Codecs which have the CODEC_CAP_DELAY capability set have a delay
3438 * between input and output, these need to be fed with avpkt->data=NULL,
3439 * avpkt->size=0 at the end to return the remaining frames.
3441 * @param avctx the codec context
3442 * @param[out] picture The AVFrame in which the decoded video frame will be stored.
3443 * Use av_frame_alloc() to get an AVFrame. The codec will
3444 * allocate memory for the actual bitmap by calling the
3445 * AVCodecContext.get_buffer2() callback.
3446 * When AVCodecContext.refcounted_frames is set to 1, the frame is
3447 * reference counted and the returned reference belongs to the
3448 * caller. The caller must release the frame using av_frame_unref()
3449 * when the frame is no longer needed. The caller may safely write
3450 * to the frame if av_frame_is_writable() returns 1.
3451 * When AVCodecContext.refcounted_frames is set to 0, the returned
3452 * reference belongs to the decoder and is valid only until the
3453 * next call to this function or until closing or flushing the
3454 * decoder. The caller may not write to it.
3456 * @param[in] avpkt The input AVpacket containing the input buffer.
3457 * You can create such packet with av_init_packet() and by then setting
3458 * data and size, some decoders might in addition need other fields like
3459 * flags&AV_PKT_FLAG_KEY. All decoders are designed to use the least
3461 * @param[in,out] got_picture_ptr Zero if no frame could be decompressed, otherwise, it is nonzero.
3462 * @return On error a negative value is returned, otherwise the number of bytes
3463 * used or zero if no frame could be decompressed.
3465 int avcodec_decode_video2(AVCodecContext *avctx, AVFrame *picture,
3466 int *got_picture_ptr,
3470 * Decode a subtitle message.
3471 * Return a negative value on error, otherwise return the number of bytes used.
3472 * If no subtitle could be decompressed, got_sub_ptr is zero.
3473 * Otherwise, the subtitle is stored in *sub.
3474 * Note that CODEC_CAP_DR1 is not available for subtitle codecs. This is for
3475 * simplicity, because the performance difference is expect to be negligible
3476 * and reusing a get_buffer written for video codecs would probably perform badly
3477 * due to a potentially very different allocation pattern.
3479 * @param avctx the codec context
3480 * @param[out] sub The AVSubtitle in which the decoded subtitle will be stored, must be
3481 freed with avsubtitle_free if *got_sub_ptr is set.
3482 * @param[in,out] got_sub_ptr Zero if no subtitle could be decompressed, otherwise, it is nonzero.
3483 * @param[in] avpkt The input AVPacket containing the input buffer.
3485 int avcodec_decode_subtitle2(AVCodecContext *avctx, AVSubtitle *sub,
3490 * @defgroup lavc_parsing Frame parsing
3494 enum AVPictureStructure {
3495 AV_PICTURE_STRUCTURE_UNKNOWN, //< unknown
3496 AV_PICTURE_STRUCTURE_TOP_FIELD, //< coded as top field
3497 AV_PICTURE_STRUCTURE_BOTTOM_FIELD, //< coded as bottom field
3498 AV_PICTURE_STRUCTURE_FRAME, //< coded as frame
3501 typedef struct AVCodecParserContext {
3503 struct AVCodecParser *parser;
3504 int64_t frame_offset; /* offset of the current frame */
3505 int64_t cur_offset; /* current offset
3506 (incremented by each av_parser_parse()) */
3507 int64_t next_frame_offset; /* offset of the next frame */
3509 int pict_type; /* XXX: Put it back in AVCodecContext. */
3511 * This field is used for proper frame duration computation in lavf.
3512 * It signals, how much longer the frame duration of the current frame
3513 * is compared to normal frame duration.
3515 * frame_duration = (1 + repeat_pict) * time_base
3517 * It is used by codecs like H.264 to display telecined material.
3519 int repeat_pict; /* XXX: Put it back in AVCodecContext. */
3520 int64_t pts; /* pts of the current frame */
3521 int64_t dts; /* dts of the current frame */
3526 int fetch_timestamp;
3528 #define AV_PARSER_PTS_NB 4
3529 int cur_frame_start_index;
3530 int64_t cur_frame_offset[AV_PARSER_PTS_NB];
3531 int64_t cur_frame_pts[AV_PARSER_PTS_NB];
3532 int64_t cur_frame_dts[AV_PARSER_PTS_NB];
3535 #define PARSER_FLAG_COMPLETE_FRAMES 0x0001
3536 #define PARSER_FLAG_ONCE 0x0002
3537 /// Set if the parser has a valid file offset
3538 #define PARSER_FLAG_FETCHED_OFFSET 0x0004
3540 int64_t offset; ///< byte offset from starting packet start
3541 int64_t cur_frame_end[AV_PARSER_PTS_NB];
3544 * Set by parser to 1 for key frames and 0 for non-key frames.
3545 * It is initialized to -1, so if the parser doesn't set this flag,
3546 * old-style fallback using AV_PICTURE_TYPE_I picture type as key frames
3552 * Time difference in stream time base units from the pts of this
3553 * packet to the point at which the output from the decoder has converged
3554 * independent from the availability of previous frames. That is, the
3555 * frames are virtually identical no matter if decoding started from
3556 * the very first frame or from this keyframe.
3557 * Is AV_NOPTS_VALUE if unknown.
3558 * This field is not the display duration of the current frame.
3559 * This field has no meaning if the packet does not have AV_PKT_FLAG_KEY
3562 * The purpose of this field is to allow seeking in streams that have no
3563 * keyframes in the conventional sense. It corresponds to the
3564 * recovery point SEI in H.264 and match_time_delta in NUT. It is also
3565 * essential for some types of subtitle streams to ensure that all
3566 * subtitles are correctly displayed after seeking.
3568 int64_t convergence_duration;
3570 // Timestamp generation support:
3572 * Synchronization point for start of timestamp generation.
3574 * Set to >0 for sync point, 0 for no sync point and <0 for undefined
3577 * For example, this corresponds to presence of H.264 buffering period
3583 * Offset of the current timestamp against last timestamp sync point in
3584 * units of AVCodecContext.time_base.
3586 * Set to INT_MIN when dts_sync_point unused. Otherwise, it must
3587 * contain a valid timestamp offset.
3589 * Note that the timestamp of sync point has usually a nonzero
3590 * dts_ref_dts_delta, which refers to the previous sync point. Offset of
3591 * the next frame after timestamp sync point will be usually 1.
3593 * For example, this corresponds to H.264 cpb_removal_delay.
3595 int dts_ref_dts_delta;
3598 * Presentation delay of current frame in units of AVCodecContext.time_base.
3600 * Set to INT_MIN when dts_sync_point unused. Otherwise, it must
3601 * contain valid non-negative timestamp delta (presentation time of a frame
3602 * must not lie in the past).
3604 * This delay represents the difference between decoding and presentation
3605 * time of the frame.
3607 * For example, this corresponds to H.264 dpb_output_delay.
3612 * Position of the packet in file.
3614 * Analogous to cur_frame_pts/dts
3616 int64_t cur_frame_pos[AV_PARSER_PTS_NB];
3619 * Byte position of currently parsed frame in stream.
3624 * Previous frame byte position.
3629 * Duration of the current frame.
3630 * For audio, this is in units of 1 / AVCodecContext.sample_rate.
3631 * For all other types, this is in units of AVCodecContext.time_base.
3635 enum AVFieldOrder field_order;
3638 * Indicate whether a picture is coded as a frame, top field or bottom field.
3640 * For example, H.264 field_pic_flag equal to 0 corresponds to
3641 * AV_PICTURE_STRUCTURE_FRAME. An H.264 picture with field_pic_flag
3642 * equal to 1 and bottom_field_flag equal to 0 corresponds to
3643 * AV_PICTURE_STRUCTURE_TOP_FIELD.
3645 enum AVPictureStructure picture_structure;
3648 * Picture number incremented in presentation or output order.
3649 * This field may be reinitialized at the first picture of a new sequence.
3651 * For example, this corresponds to H.264 PicOrderCnt.
3653 int output_picture_number;
3654 } AVCodecParserContext;
3656 typedef struct AVCodecParser {
3657 int codec_ids[5]; /* several codec IDs are permitted */
3659 int (*parser_init)(AVCodecParserContext *s);
3660 int (*parser_parse)(AVCodecParserContext *s,
3661 AVCodecContext *avctx,
3662 const uint8_t **poutbuf, int *poutbuf_size,
3663 const uint8_t *buf, int buf_size);
3664 void (*parser_close)(AVCodecParserContext *s);
3665 int (*split)(AVCodecContext *avctx, const uint8_t *buf, int buf_size);
3666 struct AVCodecParser *next;
3669 AVCodecParser *av_parser_next(AVCodecParser *c);
3671 void av_register_codec_parser(AVCodecParser *parser);
3672 AVCodecParserContext *av_parser_init(int codec_id);
3677 * @param s parser context.
3678 * @param avctx codec context.
3679 * @param poutbuf set to pointer to parsed buffer or NULL if not yet finished.
3680 * @param poutbuf_size set to size of parsed buffer or zero if not yet finished.
3681 * @param buf input buffer.
3682 * @param buf_size input length, to signal EOF, this should be 0 (so that the last frame can be output).
3683 * @param pts input presentation timestamp.
3684 * @param dts input decoding timestamp.
3685 * @param pos input byte position in stream.
3686 * @return the number of bytes of the input bitstream used.
3691 * len = av_parser_parse2(myparser, AVCodecContext, &data, &size,
3698 * decode_frame(data, size);
3702 int av_parser_parse2(AVCodecParserContext *s,
3703 AVCodecContext *avctx,
3704 uint8_t **poutbuf, int *poutbuf_size,
3705 const uint8_t *buf, int buf_size,
3706 int64_t pts, int64_t dts,
3710 * @return 0 if the output buffer is a subset of the input, 1 if it is allocated and must be freed
3711 * @deprecated use AVBitstreamFilter
3713 int av_parser_change(AVCodecParserContext *s,
3714 AVCodecContext *avctx,
3715 uint8_t **poutbuf, int *poutbuf_size,
3716 const uint8_t *buf, int buf_size, int keyframe);
3717 void av_parser_close(AVCodecParserContext *s);
3725 * @addtogroup lavc_encoding
3730 * Find a registered encoder with a matching codec ID.
3732 * @param id AVCodecID of the requested encoder
3733 * @return An encoder if one was found, NULL otherwise.
3735 AVCodec *avcodec_find_encoder(enum AVCodecID id);
3738 * Find a registered encoder with the specified name.
3740 * @param name name of the requested encoder
3741 * @return An encoder if one was found, NULL otherwise.
3743 AVCodec *avcodec_find_encoder_by_name(const char *name);
3746 * Encode a frame of audio.
3748 * Takes input samples from frame and writes the next output packet, if
3749 * available, to avpkt. The output packet does not necessarily contain data for
3750 * the most recent frame, as encoders can delay, split, and combine input frames
3751 * internally as needed.
3753 * @param avctx codec context
3754 * @param avpkt output AVPacket.
3755 * The user can supply an output buffer by setting
3756 * avpkt->data and avpkt->size prior to calling the
3757 * function, but if the size of the user-provided data is not
3758 * large enough, encoding will fail. All other AVPacket fields
3759 * will be reset by the encoder using av_init_packet(). If
3760 * avpkt->data is NULL, the encoder will allocate it.
3761 * The encoder will set avpkt->size to the size of the
3764 * If this function fails or produces no output, avpkt will be
3765 * freed using av_free_packet() (i.e. avpkt->destruct will be
3766 * called to free the user supplied buffer).
3767 * @param[in] frame AVFrame containing the raw audio data to be encoded.
3768 * May be NULL when flushing an encoder that has the
3769 * CODEC_CAP_DELAY capability set.
3770 * If CODEC_CAP_VARIABLE_FRAME_SIZE is set, then each frame
3771 * can have any number of samples.
3772 * If it is not set, frame->nb_samples must be equal to
3773 * avctx->frame_size for all frames except the last.
3774 * The final frame may be smaller than avctx->frame_size.
3775 * @param[out] got_packet_ptr This field is set to 1 by libavcodec if the
3776 * output packet is non-empty, and to 0 if it is
3777 * empty. If the function returns an error, the
3778 * packet can be assumed to be invalid, and the
3779 * value of got_packet_ptr is undefined and should