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 #if FF_API_FAST_MALLOC
40 // to provide fast_*alloc
41 #include "libavutil/mem.h"
43 #include "libavutil/pixfmt.h"
44 #include "libavutil/rational.h"
49 * @defgroup libavc Encoding/Decoding Library
52 * @defgroup lavc_decoding Decoding
56 * @defgroup lavc_encoding Encoding
60 * @defgroup lavc_codec Codecs
62 * @defgroup lavc_codec_native Native Codecs
65 * @defgroup lavc_codec_wrappers External library wrappers
68 * @defgroup lavc_codec_hwaccel Hardware Accelerators bridge
72 * @defgroup lavc_internal Internal
80 * @defgroup lavc_core Core functions/structures.
83 * Basic definitions, functions for querying libavcodec capabilities,
84 * allocating core structures, etc.
90 * Identify the syntax and semantics of the bitstream.
91 * The principle is roughly:
92 * Two decoders with the same ID can decode the same streams.
93 * Two encoders with the same ID can encode compatible streams.
94 * There may be slight deviations from the principle due to implementation
97 * If you add a codec ID to this list, add it so that
98 * 1. no value of a existing codec ID changes (that would break ABI),
99 * 2. it is as close as possible to similar codecs.
101 * After adding new codec IDs, do not forget to add an entry to the codec
102 * descriptor list and bump libavcodec minor version.
108 AV_CODEC_ID_MPEG1VIDEO,
109 AV_CODEC_ID_MPEG2VIDEO, ///< preferred ID for MPEG-1/2 video decoding
111 AV_CODEC_ID_MPEG2VIDEO_XVMC,
112 #endif /* FF_API_XVMC */
123 AV_CODEC_ID_RAWVIDEO,
124 AV_CODEC_ID_MSMPEG4V1,
125 AV_CODEC_ID_MSMPEG4V2,
126 AV_CODEC_ID_MSMPEG4V3,
149 AV_CODEC_ID_INTERPLAY_VIDEO,
156 AV_CODEC_ID_MSVIDEO1,
161 AV_CODEC_ID_TRUEMOTION1,
162 AV_CODEC_ID_VMDVIDEO,
187 AV_CODEC_ID_TRUEMOTION2,
193 AV_CODEC_ID_SMACKVIDEO,
198 AV_CODEC_ID_JPEG2000,
204 AV_CODEC_ID_DSICINVIDEO,
205 AV_CODEC_ID_TIERTEXSEQVIDEO,
213 AV_CODEC_ID_BETHSOFTVID,
225 AV_CODEC_ID_ESCAPE124,
229 AV_CODEC_ID_MOTIONPIXELS,
241 AV_CODEC_ID_FLASHSV2,
242 AV_CODEC_ID_CDGRAPHICS,
245 AV_CODEC_ID_BINKVIDEO,
246 AV_CODEC_ID_IFF_ILBM,
247 AV_CODEC_ID_IFF_BYTERUN1,
253 AV_CODEC_ID_A64_MULTI,
254 AV_CODEC_ID_A64_MULTI5,
257 AV_CODEC_ID_LAGARITH,
261 AV_CODEC_ID_WMV3IMAGE,
262 AV_CODEC_ID_VC1IMAGE,
264 AV_CODEC_ID_BMV_VIDEO,
271 AV_CODEC_ID_ZEROCODEC,
280 AV_CODEC_ID_ESCAPE130,
283 AV_CODEC_ID_HNM4_VIDEO,
286 /* various PCM "codecs" */
287 AV_CODEC_ID_FIRST_AUDIO = 0x10000, ///< A dummy id pointing at the start of audio codecs
288 AV_CODEC_ID_PCM_S16LE = 0x10000,
289 AV_CODEC_ID_PCM_S16BE,
290 AV_CODEC_ID_PCM_U16LE,
291 AV_CODEC_ID_PCM_U16BE,
294 AV_CODEC_ID_PCM_MULAW,
295 AV_CODEC_ID_PCM_ALAW,
296 AV_CODEC_ID_PCM_S32LE,
297 AV_CODEC_ID_PCM_S32BE,
298 AV_CODEC_ID_PCM_U32LE,
299 AV_CODEC_ID_PCM_U32BE,
300 AV_CODEC_ID_PCM_S24LE,
301 AV_CODEC_ID_PCM_S24BE,
302 AV_CODEC_ID_PCM_U24LE,
303 AV_CODEC_ID_PCM_U24BE,
304 AV_CODEC_ID_PCM_S24DAUD,
305 AV_CODEC_ID_PCM_ZORK,
306 AV_CODEC_ID_PCM_S16LE_PLANAR,
308 AV_CODEC_ID_PCM_F32BE,
309 AV_CODEC_ID_PCM_F32LE,
310 AV_CODEC_ID_PCM_F64BE,
311 AV_CODEC_ID_PCM_F64LE,
312 AV_CODEC_ID_PCM_BLURAY,
315 AV_CODEC_ID_PCM_S8_PLANAR,
316 AV_CODEC_ID_PCM_S24LE_PLANAR,
317 AV_CODEC_ID_PCM_S32LE_PLANAR,
319 /* various ADPCM codecs */
320 AV_CODEC_ID_ADPCM_IMA_QT = 0x11000,
321 AV_CODEC_ID_ADPCM_IMA_WAV,
322 AV_CODEC_ID_ADPCM_IMA_DK3,
323 AV_CODEC_ID_ADPCM_IMA_DK4,
324 AV_CODEC_ID_ADPCM_IMA_WS,
325 AV_CODEC_ID_ADPCM_IMA_SMJPEG,
326 AV_CODEC_ID_ADPCM_MS,
327 AV_CODEC_ID_ADPCM_4XM,
328 AV_CODEC_ID_ADPCM_XA,
329 AV_CODEC_ID_ADPCM_ADX,
330 AV_CODEC_ID_ADPCM_EA,
331 AV_CODEC_ID_ADPCM_G726,
332 AV_CODEC_ID_ADPCM_CT,
333 AV_CODEC_ID_ADPCM_SWF,
334 AV_CODEC_ID_ADPCM_YAMAHA,
335 AV_CODEC_ID_ADPCM_SBPRO_4,
336 AV_CODEC_ID_ADPCM_SBPRO_3,
337 AV_CODEC_ID_ADPCM_SBPRO_2,
338 AV_CODEC_ID_ADPCM_THP,
339 AV_CODEC_ID_ADPCM_IMA_AMV,
340 AV_CODEC_ID_ADPCM_EA_R1,
341 AV_CODEC_ID_ADPCM_EA_R3,
342 AV_CODEC_ID_ADPCM_EA_R2,
343 AV_CODEC_ID_ADPCM_IMA_EA_SEAD,
344 AV_CODEC_ID_ADPCM_IMA_EA_EACS,
345 AV_CODEC_ID_ADPCM_EA_XAS,
346 AV_CODEC_ID_ADPCM_EA_MAXIS_XA,
347 AV_CODEC_ID_ADPCM_IMA_ISS,
348 AV_CODEC_ID_ADPCM_G722,
349 AV_CODEC_ID_ADPCM_IMA_APC,
352 AV_CODEC_ID_AMR_NB = 0x12000,
355 /* RealAudio codecs*/
356 AV_CODEC_ID_RA_144 = 0x13000,
359 /* various DPCM codecs */
360 AV_CODEC_ID_ROQ_DPCM = 0x14000,
361 AV_CODEC_ID_INTERPLAY_DPCM,
362 AV_CODEC_ID_XAN_DPCM,
363 AV_CODEC_ID_SOL_DPCM,
366 AV_CODEC_ID_MP2 = 0x15000,
367 AV_CODEC_ID_MP3, ///< preferred ID for decoding MPEG audio layer 1, 2 or 3
377 AV_CODEC_ID_VMDAUDIO,
383 AV_CODEC_ID_WESTWOOD_SND1,
384 AV_CODEC_ID_GSM, ///< as in Berlin toast format
387 AV_CODEC_ID_TRUESPEECH,
389 AV_CODEC_ID_SMACKAUDIO,
392 AV_CODEC_ID_DSICINAUDIO,
394 AV_CODEC_ID_MUSEPACK7,
396 AV_CODEC_ID_GSM_MS, /* as found in WAV */
402 AV_CODEC_ID_NELLYMOSER,
403 AV_CODEC_ID_MUSEPACK8,
405 AV_CODEC_ID_WMAVOICE,
407 AV_CODEC_ID_WMALOSSLESS,
416 AV_CODEC_ID_BINKAUDIO_RDFT,
417 AV_CODEC_ID_BINKAUDIO_DCT,
418 AV_CODEC_ID_AAC_LATM,
423 AV_CODEC_ID_8SVX_EXP,
424 AV_CODEC_ID_8SVX_FIB,
425 AV_CODEC_ID_BMV_AUDIO,
430 AV_CODEC_ID_COMFORT_NOISE,
432 AV_CODEC_ID_METASOUND,
434 /* subtitle codecs */
435 AV_CODEC_ID_FIRST_SUBTITLE = 0x17000, ///< A dummy ID pointing at the start of subtitle codecs.
436 AV_CODEC_ID_DVD_SUBTITLE = 0x17000,
437 AV_CODEC_ID_DVB_SUBTITLE,
438 AV_CODEC_ID_TEXT, ///< raw UTF-8 text
441 AV_CODEC_ID_MOV_TEXT,
442 AV_CODEC_ID_HDMV_PGS_SUBTITLE,
443 AV_CODEC_ID_DVB_TELETEXT,
446 /* other specific kind of codecs (generally used for attachments) */
447 AV_CODEC_ID_FIRST_UNKNOWN = 0x18000, ///< A dummy ID pointing at the start of various fake codecs.
448 AV_CODEC_ID_TTF = 0x18000,
450 AV_CODEC_ID_PROBE = 0x19000, ///< codec_id is not known (like AV_CODEC_ID_NONE) but lavf should attempt to identify it
452 AV_CODEC_ID_MPEG2TS = 0x20000, /**< _FAKE_ codec to indicate a raw MPEG-2 TS
453 * stream (only used by libavformat) */
454 AV_CODEC_ID_MPEG4SYSTEMS = 0x20001, /**< _FAKE_ codec to indicate a MPEG-4 Systems
455 * stream (only used by libavformat) */
456 AV_CODEC_ID_FFMETADATA = 0x21000, ///< Dummy codec for streams containing only metadata information.
460 * This struct describes the properties of a single codec described by an
462 * @see avcodec_get_descriptor()
464 typedef struct AVCodecDescriptor {
466 enum AVMediaType type;
468 * Name of the codec described by this descriptor. It is non-empty and
469 * unique for each codec descriptor. It should contain alphanumeric
470 * characters and '_' only.
474 * A more descriptive name for this codec. May be NULL.
476 const char *long_name;
478 * Codec properties, a combination of AV_CODEC_PROP_* flags.
484 * Codec uses only intra compression.
487 #define AV_CODEC_PROP_INTRA_ONLY (1 << 0)
489 * Codec supports lossy compression. Audio and video codecs only.
490 * @note a codec may support both lossy and lossless
493 #define AV_CODEC_PROP_LOSSY (1 << 1)
495 * Codec supports lossless compression. Audio and video codecs only.
497 #define AV_CODEC_PROP_LOSSLESS (1 << 2)
500 * @ingroup lavc_decoding
501 * Required number of additionally allocated bytes at the end of the input bitstream for decoding.
502 * This is mainly needed because some optimized bitstream readers read
503 * 32 or 64 bit at once and could read over the end.<br>
504 * Note: If the first 23 bits of the additional bytes are not 0, then damaged
505 * MPEG bitstreams could cause overread and segfault.
507 #define FF_INPUT_BUFFER_PADDING_SIZE 8
510 * @ingroup lavc_encoding
511 * minimum encoding buffer size
512 * Used to avoid some checks during header writing.
514 #define FF_MIN_BUFFER_SIZE 16384
518 * @ingroup lavc_encoding
519 * motion estimation type.
522 ME_ZERO = 1, ///< no search, that is use 0,0 vector whenever one is needed
526 ME_EPZS, ///< enhanced predictive zonal search
527 ME_X1, ///< reserved for experiments
528 ME_HEX, ///< hexagon based search
529 ME_UMH, ///< uneven multi-hexagon search
530 ME_TESA, ///< transformed exhaustive search algorithm
534 * @ingroup lavc_decoding
537 /* We leave some space between them for extensions (drop some
538 * keyframes for intra-only or drop just some bidir frames). */
539 AVDISCARD_NONE =-16, ///< discard nothing
540 AVDISCARD_DEFAULT = 0, ///< discard useless packets like 0 size packets in avi
541 AVDISCARD_NONREF = 8, ///< discard all non reference
542 AVDISCARD_BIDIR = 16, ///< discard all bidirectional frames
543 AVDISCARD_NONKEY = 32, ///< discard all frames except keyframes
544 AVDISCARD_ALL = 48, ///< discard all
547 enum AVColorPrimaries{
548 AVCOL_PRI_BT709 = 1, ///< also ITU-R BT1361 / IEC 61966-2-4 / SMPTE RP177 Annex B
549 AVCOL_PRI_UNSPECIFIED = 2,
550 AVCOL_PRI_BT470M = 4,
551 AVCOL_PRI_BT470BG = 5, ///< also ITU-R BT601-6 625 / ITU-R BT1358 625 / ITU-R BT1700 625 PAL & SECAM
552 AVCOL_PRI_SMPTE170M = 6, ///< also ITU-R BT601-6 525 / ITU-R BT1358 525 / ITU-R BT1700 NTSC
553 AVCOL_PRI_SMPTE240M = 7, ///< functionally identical to above
555 AVCOL_PRI_BT2020 = 9, ///< ITU-R BT2020
556 AVCOL_PRI_NB , ///< Not part of ABI
559 enum AVColorTransferCharacteristic{
560 AVCOL_TRC_BT709 = 1, ///< also ITU-R BT1361
561 AVCOL_TRC_UNSPECIFIED = 2,
562 AVCOL_TRC_GAMMA22 = 4, ///< also ITU-R BT470M / ITU-R BT1700 625 PAL & SECAM
563 AVCOL_TRC_GAMMA28 = 5, ///< also ITU-R BT470BG
564 AVCOL_TRC_SMPTE170M = 6, ///< also ITU-R BT601-6 525 or 625 / ITU-R BT1358 525 or 625 / ITU-R BT1700 NTSC
565 AVCOL_TRC_SMPTE240M = 7,
566 AVCOL_TRC_LINEAR = 8, ///< "Linear transfer characteristics"
567 AVCOL_TRC_LOG = 9, ///< "Logarithmic transfer characteristic (100:1 range)"
568 AVCOL_TRC_LOG_SQRT = 10, ///< "Logarithmic transfer characteristic (100 * Sqrt( 10 ) : 1 range)"
569 AVCOL_TRC_IEC61966_2_4 = 11, ///< IEC 61966-2-4
570 AVCOL_TRC_BT1361_ECG = 12, ///< ITU-R BT1361 Extended Colour Gamut
571 AVCOL_TRC_IEC61966_2_1 = 13, ///< IEC 61966-2-1 (sRGB or sYCC)
572 AVCOL_TRC_BT2020_10 = 14, ///< ITU-R BT2020 for 10 bit system
573 AVCOL_TRC_BT2020_12 = 15, ///< ITU-R BT2020 for 12 bit system
574 AVCOL_TRC_NB , ///< Not part of ABI
579 AVCOL_SPC_BT709 = 1, ///< also ITU-R BT1361 / IEC 61966-2-4 xvYCC709 / SMPTE RP177 Annex B
580 AVCOL_SPC_UNSPECIFIED = 2,
582 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
583 AVCOL_SPC_SMPTE170M = 6, ///< also ITU-R BT601-6 525 / ITU-R BT1358 525 / ITU-R BT1700 NTSC / functionally identical to above
584 AVCOL_SPC_SMPTE240M = 7,
585 AVCOL_SPC_YCOCG = 8, ///< Used by Dirac / VC-2 and H.264 FRext, see ITU-T SG16
586 AVCOL_SPC_BT2020_NCL = 9, ///< ITU-R BT2020 non-constant luminance system
587 AVCOL_SPC_BT2020_CL = 10, ///< ITU-R BT2020 constant luminance system
588 AVCOL_SPC_NB , ///< Not part of ABI
592 AVCOL_RANGE_UNSPECIFIED = 0,
593 AVCOL_RANGE_MPEG = 1, ///< the normal 219*2^(n-8) "MPEG" YUV ranges
594 AVCOL_RANGE_JPEG = 2, ///< the normal 2^n-1 "JPEG" YUV ranges
595 AVCOL_RANGE_NB , ///< Not part of ABI
599 * X X 3 4 X X are luma samples,
600 * 1 2 1-6 are possible chroma positions
601 * X X 5 6 X 0 is undefined/unknown position
603 enum AVChromaLocation{
604 AVCHROMA_LOC_UNSPECIFIED = 0,
605 AVCHROMA_LOC_LEFT = 1, ///< mpeg2/4, h264 default
606 AVCHROMA_LOC_CENTER = 2, ///< mpeg1, jpeg, h263
607 AVCHROMA_LOC_TOPLEFT = 3, ///< DV
608 AVCHROMA_LOC_TOP = 4,
609 AVCHROMA_LOC_BOTTOMLEFT = 5,
610 AVCHROMA_LOC_BOTTOM = 6,
611 AVCHROMA_LOC_NB , ///< Not part of ABI
614 enum AVAudioServiceType {
615 AV_AUDIO_SERVICE_TYPE_MAIN = 0,
616 AV_AUDIO_SERVICE_TYPE_EFFECTS = 1,
617 AV_AUDIO_SERVICE_TYPE_VISUALLY_IMPAIRED = 2,
618 AV_AUDIO_SERVICE_TYPE_HEARING_IMPAIRED = 3,
619 AV_AUDIO_SERVICE_TYPE_DIALOGUE = 4,
620 AV_AUDIO_SERVICE_TYPE_COMMENTARY = 5,
621 AV_AUDIO_SERVICE_TYPE_EMERGENCY = 6,
622 AV_AUDIO_SERVICE_TYPE_VOICE_OVER = 7,
623 AV_AUDIO_SERVICE_TYPE_KARAOKE = 8,
624 AV_AUDIO_SERVICE_TYPE_NB , ///< Not part of ABI
628 * @ingroup lavc_encoding
630 typedef struct RcOverride{
633 int qscale; // If this is 0 then quality_factor will be used instead.
634 float quality_factor;
637 #if FF_API_MAX_BFRAMES
639 * @deprecated there is no libavcodec-wide limit on the number of B-frames
641 #define FF_MAX_B_FRAMES 16
645 These flags can be passed in AVCodecContext.flags before initialization.
646 Note: Not everything is supported yet.
650 * Allow decoders to produce frames with data planes that are not aligned
651 * to CPU requirements (e.g. due to cropping).
653 #define CODEC_FLAG_UNALIGNED 0x0001
654 #define CODEC_FLAG_QSCALE 0x0002 ///< Use fixed qscale.
655 #define CODEC_FLAG_4MV 0x0004 ///< 4 MV per MB allowed / advanced prediction for H.263.
656 #define CODEC_FLAG_OUTPUT_CORRUPT 0x0008 ///< Output even those frames that might be corrupted
657 #define CODEC_FLAG_QPEL 0x0010 ///< Use qpel MC.
658 #define CODEC_FLAG_GMC 0x0020 ///< Use GMC.
659 #define CODEC_FLAG_MV0 0x0040 ///< Always try a MB with MV=<0,0>.
661 * The parent program guarantees that the input for B-frames containing
662 * streams is not written to for at least s->max_b_frames+1 frames, if
663 * this is not set the input will be copied.
665 #define CODEC_FLAG_INPUT_PRESERVED 0x0100
666 #define CODEC_FLAG_PASS1 0x0200 ///< Use internal 2pass ratecontrol in first pass mode.
667 #define CODEC_FLAG_PASS2 0x0400 ///< Use internal 2pass ratecontrol in second pass mode.
668 #define CODEC_FLAG_GRAY 0x2000 ///< Only decode/encode grayscale.
669 #define CODEC_FLAG_EMU_EDGE 0x4000 ///< Don't draw edges.
670 #define CODEC_FLAG_PSNR 0x8000 ///< error[?] variables will be set during encoding.
671 #define CODEC_FLAG_TRUNCATED 0x00010000 /** Input bitstream might be truncated at a random
672 location instead of only at frame boundaries. */
673 #define CODEC_FLAG_NORMALIZE_AQP 0x00020000 ///< Normalize adaptive quantization.
674 #define CODEC_FLAG_INTERLACED_DCT 0x00040000 ///< Use interlaced DCT.
675 #define CODEC_FLAG_LOW_DELAY 0x00080000 ///< Force low delay.
676 #define CODEC_FLAG_GLOBAL_HEADER 0x00400000 ///< Place global headers in extradata instead of every keyframe.
677 #define CODEC_FLAG_BITEXACT 0x00800000 ///< Use only bitexact stuff (except (I)DCT).
678 /* Fx : Flag for h263+ extra options */
679 #define CODEC_FLAG_AC_PRED 0x01000000 ///< H.263 advanced intra coding / MPEG-4 AC prediction
680 #define CODEC_FLAG_LOOP_FILTER 0x00000800 ///< loop filter
681 #define CODEC_FLAG_INTERLACED_ME 0x20000000 ///< interlaced motion estimation
682 #define CODEC_FLAG_CLOSED_GOP 0x80000000
683 #define CODEC_FLAG2_FAST 0x00000001 ///< Allow non spec compliant speedup tricks.
684 #define CODEC_FLAG2_NO_OUTPUT 0x00000004 ///< Skip bitstream encoding.
685 #define CODEC_FLAG2_LOCAL_HEADER 0x00000008 ///< Place global headers at every keyframe instead of in extradata.
686 #define CODEC_FLAG2_IGNORE_CROP 0x00010000 ///< Discard cropping information from SPS.
688 #define CODEC_FLAG2_CHUNKS 0x00008000 ///< Input bitstream might be truncated at a packet boundaries instead of only at frame boundaries.
690 /* Unsupported options :
691 * Syntax Arithmetic coding (SAC)
692 * Reference Picture Selection
693 * Independent Segment Decoding */
695 /* codec capabilities */
697 #define CODEC_CAP_DRAW_HORIZ_BAND 0x0001 ///< Decoder can use draw_horiz_band callback.
699 * Codec uses get_buffer() for allocating buffers and supports custom allocators.
700 * If not set, it might not use get_buffer() at all or use operations that
701 * assume the buffer was allocated by avcodec_default_get_buffer.
703 #define CODEC_CAP_DR1 0x0002
704 #define CODEC_CAP_TRUNCATED 0x0008
706 /* Codec can export data for HW decoding (XvMC). */
707 #define CODEC_CAP_HWACCEL 0x0010
708 #endif /* FF_API_XVMC */
710 * Encoder or decoder requires flushing with NULL input at the end in order to
711 * give the complete and correct output.
713 * NOTE: If this flag is not set, the codec is guaranteed to never be fed with
714 * with NULL data. The user can still send NULL data to the public encode
715 * or decode function, but libavcodec will not pass it along to the codec
716 * unless this flag is set.
719 * The decoder has a non-zero delay and needs to be fed with avpkt->data=NULL,
720 * avpkt->size=0 at the end to get the delayed data until the decoder no longer
724 * The encoder needs to be fed with NULL data at the end of encoding until the
725 * encoder no longer returns data.
727 * NOTE: For encoders implementing the AVCodec.encode2() function, setting this
728 * flag also means that the encoder must set the pts and duration for
729 * each output packet. If this flag is not set, the pts and duration will
730 * be determined by libavcodec from the input frame.
732 #define CODEC_CAP_DELAY 0x0020
734 * Codec can be fed a final frame with a smaller size.
735 * This can be used to prevent truncation of the last audio samples.
737 #define CODEC_CAP_SMALL_LAST_FRAME 0x0040
740 * Codec can export data for HW decoding (VDPAU).
742 #define CODEC_CAP_HWACCEL_VDPAU 0x0080
745 * Codec can output multiple frames per AVPacket
746 * Normally demuxers return one frame at a time, demuxers which do not do
747 * are connected to a parser to split what they return into proper frames.
748 * This flag is reserved to the very rare category of codecs which have a
749 * bitstream that cannot be split into frames without timeconsuming
750 * operations like full decoding. Demuxers carring such bitstreams thus
751 * may return multiple frames in a packet. This has many disadvantages like
752 * prohibiting stream copy in many cases thus it should only be considered
755 #define CODEC_CAP_SUBFRAMES 0x0100
757 * Codec is experimental and is thus avoided in favor of non experimental
760 #define CODEC_CAP_EXPERIMENTAL 0x0200
762 * Codec should fill in channel configuration and samplerate instead of container
764 #define CODEC_CAP_CHANNEL_CONF 0x0400
766 * Codec is able to deal with negative linesizes
768 #define CODEC_CAP_NEG_LINESIZES 0x0800
770 * Codec supports frame-level multithreading.
772 #define CODEC_CAP_FRAME_THREADS 0x1000
774 * Codec supports slice-based (or partition-based) multithreading.
776 #define CODEC_CAP_SLICE_THREADS 0x2000
778 * Codec supports changed parameters at any point.
780 #define CODEC_CAP_PARAM_CHANGE 0x4000
782 * Codec supports avctx->thread_count == 0 (auto).
784 #define CODEC_CAP_AUTO_THREADS 0x8000
786 * Audio encoder supports receiving a different number of samples in each call.
788 #define CODEC_CAP_VARIABLE_FRAME_SIZE 0x10000
791 //The following defines may change, don't expect compatibility if you use them.
792 #define MB_TYPE_INTRA4x4 0x0001
793 #define MB_TYPE_INTRA16x16 0x0002 //FIXME H.264-specific
794 #define MB_TYPE_INTRA_PCM 0x0004 //FIXME H.264-specific
795 #define MB_TYPE_16x16 0x0008
796 #define MB_TYPE_16x8 0x0010
797 #define MB_TYPE_8x16 0x0020
798 #define MB_TYPE_8x8 0x0040
799 #define MB_TYPE_INTERLACED 0x0080
800 #define MB_TYPE_DIRECT2 0x0100 //FIXME
801 #define MB_TYPE_ACPRED 0x0200
802 #define MB_TYPE_GMC 0x0400
803 #define MB_TYPE_SKIP 0x0800
804 #define MB_TYPE_P0L0 0x1000
805 #define MB_TYPE_P1L0 0x2000
806 #define MB_TYPE_P0L1 0x4000
807 #define MB_TYPE_P1L1 0x8000
808 #define MB_TYPE_L0 (MB_TYPE_P0L0 | MB_TYPE_P1L0)
809 #define MB_TYPE_L1 (MB_TYPE_P0L1 | MB_TYPE_P1L1)
810 #define MB_TYPE_L0L1 (MB_TYPE_L0 | MB_TYPE_L1)
811 #define MB_TYPE_QUANT 0x00010000
812 #define MB_TYPE_CBP 0x00020000
813 //Note bits 24-31 are reserved for codec specific use (h264 ref0, mpeg1 0mv, ...)
818 * This specifies the area which should be displayed.
819 * Note there may be multiple such areas for one frame.
821 typedef struct AVPanScan{
824 * - encoding: Set by user.
825 * - decoding: Set by libavcodec.
830 * width and height in 1/16 pel
831 * - encoding: Set by user.
832 * - decoding: Set by libavcodec.
838 * position of the top left corner in 1/16 pel for up to 3 fields/frames
839 * - encoding: Set by user.
840 * - decoding: Set by libavcodec.
842 int16_t position[3][2];
845 #if FF_API_QSCALE_TYPE
846 #define FF_QSCALE_TYPE_MPEG1 0
847 #define FF_QSCALE_TYPE_MPEG2 1
848 #define FF_QSCALE_TYPE_H264 2
849 #define FF_QSCALE_TYPE_VP56 3
852 #if FF_API_GET_BUFFER
853 #define FF_BUFFER_TYPE_INTERNAL 1
854 #define FF_BUFFER_TYPE_USER 2 ///< direct rendering buffers (image is (de)allocated by user)
855 #define FF_BUFFER_TYPE_SHARED 4 ///< Buffer from somewhere else; don't deallocate image (data/base), all other tables are not shared.
856 #define FF_BUFFER_TYPE_COPY 8 ///< Just a (modified) copy of some other buffer, don't deallocate anything.
858 #define FF_BUFFER_HINTS_VALID 0x01 // Buffer hints value is meaningful (if 0 ignore).
859 #define FF_BUFFER_HINTS_READABLE 0x02 // Codec will read from buffer.
860 #define FF_BUFFER_HINTS_PRESERVE 0x04 // User must not alter buffer content.
861 #define FF_BUFFER_HINTS_REUSABLE 0x08 // Codec will reuse the buffer (update).
865 * The decoder will keep a reference to the frame and may reuse it later.
867 #define AV_GET_BUFFER_FLAG_REF (1 << 0)
870 * @defgroup lavc_packet AVPacket
872 * Types and functions for working with AVPacket.
875 enum AVPacketSideDataType {
877 AV_PKT_DATA_NEW_EXTRADATA,
880 * An AV_PKT_DATA_PARAM_CHANGE side data packet is laid out as follows:
883 * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_COUNT)
884 * s32le channel_count
885 * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_LAYOUT)
886 * u64le channel_layout
887 * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_SAMPLE_RATE)
889 * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_DIMENSIONS)
894 AV_PKT_DATA_PARAM_CHANGE,
897 * An AV_PKT_DATA_H263_MB_INFO side data packet contains a number of
898 * structures with info about macroblocks relevant to splitting the
899 * packet into smaller packets on macroblock edges (e.g. as for RFC 2190).
900 * That is, it does not necessarily contain info about all macroblocks,
901 * as long as the distance between macroblocks in the info is smaller
902 * than the target payload size.
903 * Each MB info structure is 12 bytes, and is laid out as follows:
905 * u32le bit offset from the start of the packet
906 * u8 current quantizer at the start of the macroblock
908 * u16le macroblock address within the GOB
909 * u8 horizontal MV predictor
910 * u8 vertical MV predictor
911 * u8 horizontal MV predictor for block number 3
912 * u8 vertical MV predictor for block number 3
915 AV_PKT_DATA_H263_MB_INFO,
919 * This structure stores compressed data. It is typically exported by demuxers
920 * and then passed as input to decoders, or received as output from encoders and
921 * then passed to muxers.
923 * For video, it should typically contain one compressed frame. For audio it may
924 * contain several compressed frames.
926 * AVPacket is one of the few structs in Libav, whose size is a part of public
927 * ABI. Thus it may be allocated on stack and no new fields can be added to it
928 * without libavcodec and libavformat major bump.
930 * The semantics of data ownership depends on the buf or destruct (deprecated)
931 * fields. If either is set, the packet data is dynamically allocated and is
932 * valid indefinitely until av_free_packet() is called (which in turn calls
933 * av_buffer_unref()/the destruct callback to free the data). If neither is set,
934 * the packet data is typically backed by some static buffer somewhere and is
935 * only valid for a limited time (e.g. until the next read call when demuxing).
937 * The side data is always allocated with av_malloc() and is freed in
940 typedef struct AVPacket {
942 * A reference to the reference-counted buffer where the packet data is
944 * May be NULL, then the packet data is not reference-counted.
948 * Presentation timestamp in AVStream->time_base units; the time at which
949 * the decompressed packet will be presented to the user.
950 * Can be AV_NOPTS_VALUE if it is not stored in the file.
951 * pts MUST be larger or equal to dts as presentation cannot happen before
952 * decompression, unless one wants to view hex dumps. Some formats misuse
953 * the terms dts and pts/cts to mean something different. Such timestamps
954 * must be converted to true pts/dts before they are stored in AVPacket.
958 * Decompression timestamp in AVStream->time_base units; the time at which
959 * the packet is decompressed.
960 * Can be AV_NOPTS_VALUE if it is not stored in the file.
967 * A combination of AV_PKT_FLAG values
971 * Additional packet data that can be provided by the container.
972 * Packet can contain several types of side information.
977 enum AVPacketSideDataType type;
982 * Duration of this packet in AVStream->time_base units, 0 if unknown.
983 * Equals next_pts - this_pts in presentation order.
986 #if FF_API_DESTRUCT_PACKET
988 void (*destruct)(struct AVPacket *);
992 int64_t pos; ///< byte position in stream, -1 if unknown
995 * Time difference in AVStream->time_base units from the pts of this
996 * packet to the point at which the output from the decoder has converged
997 * independent from the availability of previous frames. That is, the
998 * frames are virtually identical no matter if decoding started from
999 * the very first frame or from this keyframe.
1000 * Is AV_NOPTS_VALUE if unknown.
1001 * This field is not the display duration of the current packet.
1002 * This field has no meaning if the packet does not have AV_PKT_FLAG_KEY
1005 * The purpose of this field is to allow seeking in streams that have no
1006 * keyframes in the conventional sense. It corresponds to the
1007 * recovery point SEI in H.264 and match_time_delta in NUT. It is also
1008 * essential for some types of subtitle streams to ensure that all
1009 * subtitles are correctly displayed after seeking.
1011 int64_t convergence_duration;
1013 #define AV_PKT_FLAG_KEY 0x0001 ///< The packet contains a keyframe
1014 #define AV_PKT_FLAG_CORRUPT 0x0002 ///< The packet content is corrupted
1016 enum AVSideDataParamChangeFlags {
1017 AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_COUNT = 0x0001,
1018 AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_LAYOUT = 0x0002,
1019 AV_SIDE_DATA_PARAM_CHANGE_SAMPLE_RATE = 0x0004,
1020 AV_SIDE_DATA_PARAM_CHANGE_DIMENSIONS = 0x0008,
1026 struct AVCodecInternal;
1030 AV_FIELD_PROGRESSIVE,
1031 AV_FIELD_TT, //< Top coded_first, top displayed first
1032 AV_FIELD_BB, //< Bottom coded first, bottom displayed first
1033 AV_FIELD_TB, //< Top coded first, bottom displayed first
1034 AV_FIELD_BT, //< Bottom coded first, top displayed first
1038 * main external API structure.
1039 * New fields can be added to the end with minor version bumps.
1040 * Removal, reordering and changes to existing fields require a major
1042 * sizeof(AVCodecContext) must not be used outside libav*.
1044 typedef struct AVCodecContext {
1046 * information on struct for av_log
1047 * - set by avcodec_alloc_context3
1049 const AVClass *av_class;
1050 int log_level_offset;
1052 enum AVMediaType codec_type; /* see AVMEDIA_TYPE_xxx */
1053 const struct AVCodec *codec;
1054 char codec_name[32];
1055 enum AVCodecID codec_id; /* see AV_CODEC_ID_xxx */
1058 * fourcc (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A').
1059 * This is used to work around some encoder bugs.
1060 * A demuxer should set this to what is stored in the field used to identify the codec.
1061 * If there are multiple such fields in a container then the demuxer should choose the one
1062 * which maximizes the information about the used codec.
1063 * If the codec tag field in a container is larger than 32 bits then the demuxer should
1064 * remap the longer ID to 32 bits with a table or other structure. Alternatively a new
1065 * extra_codec_tag + size could be added but for this a clear advantage must be demonstrated
1067 * - encoding: Set by user, if not then the default based on codec_id will be used.
1068 * - decoding: Set by user, will be converted to uppercase by libavcodec during init.
1070 unsigned int codec_tag;
1073 * fourcc from the AVI stream header (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A').
1074 * This is used to work around some encoder bugs.
1075 * - encoding: unused
1076 * - decoding: Set by user, will be converted to uppercase by libavcodec during init.
1078 unsigned int stream_codec_tag;
1083 * Private context used for internal data.
1085 * Unlike priv_data, this is not codec-specific. It is used in general
1086 * libavcodec functions.
1088 struct AVCodecInternal *internal;
1091 * Private data of the user, can be used to carry app specific stuff.
1092 * - encoding: Set by user.
1093 * - decoding: Set by user.
1098 * the average bitrate
1099 * - encoding: Set by user; unused for constant quantizer encoding.
1100 * - decoding: Set by libavcodec. 0 or some bitrate if this info is available in the stream.
1105 * number of bits the bitstream is allowed to diverge from the reference.
1106 * the reference can be CBR (for CBR pass1) or VBR (for pass2)
1107 * - encoding: Set by user; unused for constant quantizer encoding.
1108 * - decoding: unused
1110 int bit_rate_tolerance;
1113 * Global quality for codecs which cannot change it per frame.
1114 * This should be proportional to MPEG-1/2/4 qscale.
1115 * - encoding: Set by user.
1116 * - decoding: unused
1121 * - encoding: Set by user.
1122 * - decoding: unused
1124 int compression_level;
1125 #define FF_COMPRESSION_DEFAULT -1
1129 * - encoding: Set by user.
1130 * - decoding: Set by user.
1136 * - encoding: Set by user.
1137 * - decoding: Set by user.
1142 * some codecs need / can use extradata like Huffman tables.
1143 * mjpeg: Huffman tables
1144 * rv10: additional flags
1145 * mpeg4: global headers (they can be in the bitstream or here)
1146 * The allocated memory should be FF_INPUT_BUFFER_PADDING_SIZE bytes larger
1147 * than extradata_size to avoid prolems if it is read with the bitstream reader.
1148 * The bytewise contents of extradata must not depend on the architecture or CPU endianness.
1149 * - encoding: Set/allocated/freed by libavcodec.
1150 * - decoding: Set/allocated/freed by user.
1156 * This is the fundamental unit of time (in seconds) in terms
1157 * of which frame timestamps are represented. For fixed-fps content,
1158 * timebase should be 1/framerate and timestamp increments should be
1160 * - encoding: MUST be set by user.
1161 * - decoding: Set by libavcodec.
1163 AVRational time_base;
1166 * For some codecs, the time base is closer to the field rate than the frame rate.
1167 * Most notably, H.264 and MPEG-2 specify time_base as half of frame duration
1168 * if no telecine is used ...
1170 * Set to time_base ticks per frame. Default 1, e.g., H.264/MPEG-2 set it to 2.
1172 int ticks_per_frame;
1178 * Number of frames the decoded output will be delayed relative to the
1182 * For encoding, this is the number of "priming" samples added to the
1183 * beginning of the stream. The decoded output will be delayed by this
1184 * many samples relative to the input to the encoder. Note that this
1185 * field is purely informational and does not directly affect the pts
1186 * output by the encoder, which should always be based on the actual
1187 * presentation time, including any delay.
1188 * For decoding, this is the number of samples the decoder needs to
1189 * output before the decoder's output is valid. When seeking, you should
1190 * start decoding this many samples prior to your desired seek point.
1192 * - encoding: Set by libavcodec.
1193 * - decoding: Set by libavcodec.
1200 * picture width / height.
1201 * - encoding: MUST be set by user.
1202 * - decoding: May be set by the user before opening the decoder if known e.g.
1203 * from the container. Some decoders will require the dimensions
1204 * to be set by the caller. During decoding, the decoder may
1205 * overwrite those values as required.
1210 * Bitstream width / height, may be different from width/height e.g. when
1211 * the decoded frame is cropped before being output.
1212 * - encoding: unused
1213 * - decoding: May be set by the user before opening the decoder if known
1214 * e.g. from the container. During decoding, the decoder may
1215 * overwrite those values as required.
1217 int coded_width, coded_height;
1219 #if FF_API_ASPECT_EXTENDED
1220 #define FF_ASPECT_EXTENDED 15
1224 * the number of pictures in a group of pictures, or 0 for intra_only
1225 * - encoding: Set by user.
1226 * - decoding: unused
1231 * Pixel format, see AV_PIX_FMT_xxx.
1232 * May be set by the demuxer if known from headers.
1233 * May be overriden by the decoder if it knows better.
1234 * - encoding: Set by user.
1235 * - decoding: Set by user if known, overridden by libavcodec if known
1237 enum AVPixelFormat pix_fmt;
1240 * Motion estimation algorithm used for video coding.
1241 * 1 (zero), 2 (full), 3 (log), 4 (phods), 5 (epzs), 6 (x1), 7 (hex),
1242 * 8 (umh), 10 (tesa) [7, 8, 10 are x264 specific]
1243 * - encoding: MUST be set by user.
1244 * - decoding: unused
1249 * If non NULL, 'draw_horiz_band' is called by the libavcodec
1250 * decoder to draw a horizontal band. It improves cache usage. Not
1251 * all codecs can do that. You must check the codec capabilities
1253 * When multithreading is used, it may be called from multiple threads
1254 * at the same time; threads might draw different parts of the same AVFrame,
1255 * or multiple AVFrames, and there is no guarantee that slices will be drawn
1257 * The function is also used by hardware acceleration APIs.
1258 * It is called at least once during frame decoding to pass
1259 * the data needed for hardware render.
1260 * In that mode instead of pixel data, AVFrame points to
1261 * a structure specific to the acceleration API. The application
1262 * reads the structure and can change some fields to indicate progress
1264 * - encoding: unused
1265 * - decoding: Set by user.
1266 * @param height the height of the slice
1267 * @param y the y position of the slice
1268 * @param type 1->top field, 2->bottom field, 3->frame
1269 * @param offset offset into the AVFrame.data from which the slice should be read
1271 void (*draw_horiz_band)(struct AVCodecContext *s,
1272 const AVFrame *src, int offset[AV_NUM_DATA_POINTERS],
1273 int y, int type, int height);
1276 * callback to negotiate the pixelFormat
1277 * @param fmt is the list of formats which are supported by the codec,
1278 * it is terminated by -1 as 0 is a valid format, the formats are ordered by quality.
1279 * The first is always the native one.
1280 * @return the chosen format
1281 * - encoding: unused
1282 * - decoding: Set by user, if not set the native format will be chosen.
1284 enum AVPixelFormat (*get_format)(struct AVCodecContext *s, const enum AVPixelFormat * fmt);
1287 * maximum number of B-frames between non-B-frames
1288 * Note: The output will be delayed by max_b_frames+1 relative to the input.
1289 * - encoding: Set by user.
1290 * - decoding: unused
1295 * qscale factor between IP and B-frames
1296 * If > 0 then the last P-frame quantizer will be used (q= lastp_q*factor+offset).
1297 * If < 0 then normal ratecontrol will be done (q= -normal_q*factor+offset).
1298 * - encoding: Set by user.
1299 * - decoding: unused
1301 float b_quant_factor;
1303 /** obsolete FIXME remove */
1305 #define FF_RC_STRATEGY_XVID 1
1307 int b_frame_strategy;
1310 * qscale offset between IP and B-frames
1311 * - encoding: Set by user.
1312 * - decoding: unused
1314 float b_quant_offset;
1317 * Size of the frame reordering buffer in the decoder.
1318 * For MPEG-2 it is 1 IPB or 0 low delay IP.
1319 * - encoding: Set by libavcodec.
1320 * - decoding: Set by libavcodec.
1325 * 0-> h263 quant 1-> mpeg quant
1326 * - encoding: Set by user.
1327 * - decoding: unused
1332 * qscale factor between P and I-frames
1333 * If > 0 then the last p frame quantizer will be used (q= lastp_q*factor+offset).
1334 * If < 0 then normal ratecontrol will be done (q= -normal_q*factor+offset).
1335 * - encoding: Set by user.
1336 * - decoding: unused
1338 float i_quant_factor;
1341 * qscale offset between P and I-frames
1342 * - encoding: Set by user.
1343 * - decoding: unused
1345 float i_quant_offset;
1348 * luminance masking (0-> disabled)
1349 * - encoding: Set by user.
1350 * - decoding: unused
1355 * temporary complexity masking (0-> disabled)
1356 * - encoding: Set by user.
1357 * - decoding: unused
1359 float temporal_cplx_masking;
1362 * spatial complexity masking (0-> disabled)
1363 * - encoding: Set by user.
1364 * - decoding: unused
1366 float spatial_cplx_masking;
1369 * p block masking (0-> disabled)
1370 * - encoding: Set by user.
1371 * - decoding: unused
1376 * darkness masking (0-> disabled)
1377 * - encoding: Set by user.
1378 * - decoding: unused
1384 * - encoding: Set by libavcodec.
1385 * - decoding: Set by user (or 0).
1389 * prediction method (needed for huffyuv)
1390 * - encoding: Set by user.
1391 * - decoding: unused
1393 int prediction_method;
1394 #define FF_PRED_LEFT 0
1395 #define FF_PRED_PLANE 1
1396 #define FF_PRED_MEDIAN 2
1399 * slice offsets in the frame in bytes
1400 * - encoding: Set/allocated by libavcodec.
1401 * - decoding: Set/allocated by user (or NULL).
1406 * sample aspect ratio (0 if unknown)
1407 * That is the width of a pixel divided by the height of the pixel.
1408 * Numerator and denominator must be relatively prime and smaller than 256 for some video standards.
1409 * - encoding: Set by user.
1410 * - decoding: Set by libavcodec.
1412 AVRational sample_aspect_ratio;
1415 * motion estimation comparison function
1416 * - encoding: Set by user.
1417 * - decoding: unused
1421 * subpixel motion estimation comparison function
1422 * - encoding: Set by user.
1423 * - decoding: unused
1427 * macroblock comparison function (not supported yet)
1428 * - encoding: Set by user.
1429 * - decoding: unused
1433 * interlaced DCT comparison function
1434 * - encoding: Set by user.
1435 * - decoding: unused
1438 #define FF_CMP_SAD 0
1439 #define FF_CMP_SSE 1
1440 #define FF_CMP_SATD 2
1441 #define FF_CMP_DCT 3
1442 #define FF_CMP_PSNR 4
1443 #define FF_CMP_BIT 5
1445 #define FF_CMP_ZERO 7
1446 #define FF_CMP_VSAD 8
1447 #define FF_CMP_VSSE 9
1448 #define FF_CMP_NSSE 10
1449 #define FF_CMP_DCTMAX 13
1450 #define FF_CMP_DCT264 14
1451 #define FF_CMP_CHROMA 256
1454 * ME diamond size & shape
1455 * - encoding: Set by user.
1456 * - decoding: unused
1461 * amount of previous MV predictors (2a+1 x 2a+1 square)
1462 * - encoding: Set by user.
1463 * - decoding: unused
1465 int last_predictor_count;
1468 * prepass for motion estimation
1469 * - encoding: Set by user.
1470 * - decoding: unused
1475 * motion estimation prepass comparison function
1476 * - encoding: Set by user.
1477 * - decoding: unused
1482 * ME prepass diamond size & shape
1483 * - encoding: Set by user.
1484 * - decoding: unused
1490 * - encoding: Set by user.
1491 * - decoding: unused
1493 int me_subpel_quality;
1496 * DTG active format information (additional aspect ratio
1497 * information only used in DVB MPEG-2 transport streams)
1500 * - encoding: unused
1501 * - decoding: Set by decoder.
1503 int dtg_active_format;
1504 #define FF_DTG_AFD_SAME 8
1505 #define FF_DTG_AFD_4_3 9
1506 #define FF_DTG_AFD_16_9 10
1507 #define FF_DTG_AFD_14_9 11
1508 #define FF_DTG_AFD_4_3_SP_14_9 13
1509 #define FF_DTG_AFD_16_9_SP_14_9 14
1510 #define FF_DTG_AFD_SP_4_3 15
1513 * maximum motion estimation search range in subpel units
1514 * If 0 then no limit.
1516 * - encoding: Set by user.
1517 * - decoding: unused
1522 * intra quantizer bias
1523 * - encoding: Set by user.
1524 * - decoding: unused
1526 int intra_quant_bias;
1527 #define FF_DEFAULT_QUANT_BIAS 999999
1530 * inter quantizer bias
1531 * - encoding: Set by user.
1532 * - decoding: unused
1534 int inter_quant_bias;
1538 * - encoding: unused
1539 * - decoding: Set by user.
1542 #define SLICE_FLAG_CODED_ORDER 0x0001 ///< draw_horiz_band() is called in coded order instead of display
1543 #define SLICE_FLAG_ALLOW_FIELD 0x0002 ///< allow draw_horiz_band() with field slices (MPEG2 field pics)
1544 #define SLICE_FLAG_ALLOW_PLANE 0x0004 ///< allow draw_horiz_band() with 1 component at a time (SVQ1)
1548 * XVideo Motion Acceleration
1549 * - encoding: forbidden
1550 * - decoding: set by decoder
1551 * @deprecated XvMC support is slated for removal.
1553 attribute_deprecated int xvmc_acceleration;
1554 #endif /* FF_API_XVMC */
1557 * macroblock decision mode
1558 * - encoding: Set by user.
1559 * - decoding: unused
1562 #define FF_MB_DECISION_SIMPLE 0 ///< uses mb_cmp
1563 #define FF_MB_DECISION_BITS 1 ///< chooses the one which needs the fewest bits
1564 #define FF_MB_DECISION_RD 2 ///< rate distortion
1567 * custom intra quantization matrix
1568 * - encoding: Set by user, can be NULL.
1569 * - decoding: Set by libavcodec.
1571 uint16_t *intra_matrix;
1574 * custom inter quantization matrix
1575 * - encoding: Set by user, can be NULL.
1576 * - decoding: Set by libavcodec.
1578 uint16_t *inter_matrix;
1581 * scene change detection threshold
1582 * 0 is default, larger means fewer detected scene changes.
1583 * - encoding: Set by user.
1584 * - decoding: unused
1586 int scenechange_threshold;
1589 * noise reduction strength
1590 * - encoding: Set by user.
1591 * - decoding: unused
1593 int noise_reduction;
1596 * Motion estimation threshold below which no motion estimation is
1597 * performed, but instead the user specified motion vectors are used.
1599 * - encoding: Set by user.
1600 * - decoding: unused
1605 * Macroblock threshold below which the user specified macroblock types will be used.
1606 * - encoding: Set by user.
1607 * - decoding: unused
1612 * precision of the intra DC coefficient - 8
1613 * - encoding: Set by user.
1614 * - decoding: unused
1616 int intra_dc_precision;
1619 * Number of macroblock rows at the top which are skipped.
1620 * - encoding: unused
1621 * - decoding: Set by user.
1626 * Number of macroblock rows at the bottom which are skipped.
1627 * - encoding: unused
1628 * - decoding: Set by user.
1633 * Border processing masking, raises the quantizer for mbs on the borders
1635 * - encoding: Set by user.
1636 * - decoding: unused
1638 float border_masking;
1641 * minimum MB lagrange multipler
1642 * - encoding: Set by user.
1643 * - decoding: unused
1648 * maximum MB lagrange multipler
1649 * - encoding: Set by user.
1650 * - decoding: unused
1656 * - encoding: Set by user.
1657 * - decoding: unused
1659 int me_penalty_compensation;
1663 * - encoding: Set by user.
1664 * - decoding: unused
1670 * - encoding: Set by user.
1671 * - decoding: unused
1677 * - encoding: Set by user.
1678 * - decoding: unused
1683 * number of reference frames
1684 * - encoding: Set by user.
1685 * - decoding: Set by lavc.
1690 * chroma qp offset from luma
1691 * - encoding: Set by user.
1692 * - decoding: unused
1697 * Multiplied by qscale for each frame and added to scene_change_score.
1698 * - encoding: Set by user.
1699 * - decoding: unused
1701 int scenechange_factor;
1705 * Note: Value depends upon the compare function used for fullpel ME.
1706 * - encoding: Set by user.
1707 * - decoding: unused
1712 * Adjust sensitivity of b_frame_strategy 1.
1713 * - encoding: Set by user.
1714 * - decoding: unused
1719 * Chromaticity coordinates of the source primaries.
1720 * - encoding: Set by user
1721 * - decoding: Set by libavcodec
1723 enum AVColorPrimaries color_primaries;
1726 * Color Transfer Characteristic.
1727 * - encoding: Set by user
1728 * - decoding: Set by libavcodec
1730 enum AVColorTransferCharacteristic color_trc;
1733 * YUV colorspace type.
1734 * - encoding: Set by user
1735 * - decoding: Set by libavcodec
1737 enum AVColorSpace colorspace;
1740 * MPEG vs JPEG YUV range.
1741 * - encoding: Set by user
1742 * - decoding: Set by libavcodec
1744 enum AVColorRange color_range;
1747 * This defines the location of chroma samples.
1748 * - encoding: Set by user
1749 * - decoding: Set by libavcodec
1751 enum AVChromaLocation chroma_sample_location;
1755 * Indicates number of picture subdivisions. Used for parallelized
1757 * - encoding: Set by user
1758 * - decoding: unused
1763 * - encoding: set by libavcodec
1764 * - decoding: Set by libavcodec
1766 enum AVFieldOrder field_order;
1769 int sample_rate; ///< samples per second
1770 int channels; ///< number of audio channels
1773 * audio sample format
1774 * - encoding: Set by user.
1775 * - decoding: Set by libavcodec.
1777 enum AVSampleFormat sample_fmt; ///< sample format
1779 /* The following data should not be initialized. */
1781 * Number of samples per channel in an audio frame.
1783 * - encoding: set by libavcodec in avcodec_open2(). Each submitted frame
1784 * except the last must contain exactly frame_size samples per channel.
1785 * May be 0 when the codec has CODEC_CAP_VARIABLE_FRAME_SIZE set, then the
1786 * frame size is not restricted.
1787 * - decoding: may be set by some decoders to indicate constant frame size
1792 * Frame counter, set by libavcodec.
1794 * - decoding: total number of frames returned from the decoder so far.
1795 * - encoding: total number of frames passed to the encoder so far.
1797 * @note the counter is not incremented if encoding/decoding resulted in
1803 * number of bytes per packet if constant and known or 0
1804 * Used by some WAV based audio codecs.
1809 * Audio cutoff bandwidth (0 means "automatic")
1810 * - encoding: Set by user.
1811 * - decoding: unused
1815 #if FF_API_REQUEST_CHANNELS
1817 * Decoder should decode to this many channels if it can (0 for default)
1818 * - encoding: unused
1819 * - decoding: Set by user.
1820 * @deprecated Deprecated in favor of request_channel_layout.
1822 attribute_deprecated int request_channels;
1826 * Audio channel layout.
1827 * - encoding: set by user.
1828 * - decoding: set by libavcodec.
1830 uint64_t channel_layout;
1833 * Request decoder to use this channel layout if it can (0 for default)
1834 * - encoding: unused
1835 * - decoding: Set by user.
1837 uint64_t request_channel_layout;
1840 * Type of service that the audio stream conveys.
1841 * - encoding: Set by user.
1842 * - decoding: Set by libavcodec.
1844 enum AVAudioServiceType audio_service_type;
1847 * Used to request a sample format from the decoder.
1848 * - encoding: unused.
1849 * - decoding: Set by user.
1851 enum AVSampleFormat request_sample_fmt;
1853 #if FF_API_GET_BUFFER
1855 * Called at the beginning of each frame to get a buffer for it.
1857 * The function will set AVFrame.data[], AVFrame.linesize[].
1858 * AVFrame.extended_data[] must also be set, but it should be the same as
1859 * AVFrame.data[] except for planar audio with more channels than can fit
1860 * in AVFrame.data[]. In that case, AVFrame.data[] shall still contain as
1861 * many data pointers as it can hold.
1863 * if CODEC_CAP_DR1 is not set then get_buffer() must call
1864 * avcodec_default_get_buffer() instead of providing buffers allocated by
1867 * AVFrame.data[] should be 32- or 16-byte-aligned unless the CPU doesn't
1868 * need it. avcodec_default_get_buffer() aligns the output buffer properly,
1869 * but if get_buffer() is overridden then alignment considerations should
1870 * be taken into account.
1872 * @see avcodec_default_get_buffer()
1876 * If pic.reference is set then the frame will be read later by libavcodec.
1877 * avcodec_align_dimensions2() should be used to find the required width and
1878 * height, as they normally need to be rounded up to the next multiple of 16.
1880 * If frame multithreading is used and thread_safe_callbacks is set,
1881 * it may be called from a different thread, but not from more than one at
1882 * once. Does not need to be reentrant.
1884 * @see release_buffer(), reget_buffer()
1885 * @see avcodec_align_dimensions2()
1889 * Decoders request a buffer of a particular size by setting
1890 * AVFrame.nb_samples prior to calling get_buffer(). The decoder may,
1891 * however, utilize only part of the buffer by setting AVFrame.nb_samples
1892 * to a smaller value in the output frame.
1894 * Decoders cannot use the buffer after returning from
1895 * avcodec_decode_audio4(), so they will not call release_buffer(), as it
1896 * is assumed to be released immediately upon return. In some rare cases,
1897 * a decoder may need to call get_buffer() more than once in a single
1898 * call to avcodec_decode_audio4(). In that case, when get_buffer() is
1899 * called again after it has already been called once, the previously
1900 * acquired buffer is assumed to be released at that time and may not be
1901 * reused by the decoder.
1903 * As a convenience, av_samples_get_buffer_size() and
1904 * av_samples_fill_arrays() in libavutil may be used by custom get_buffer()
1905 * functions to find the required data size and to fill data pointers and
1906 * linesize. In AVFrame.linesize, only linesize[0] may be set for audio
1907 * since all planes must be the same size.
1909 * @see av_samples_get_buffer_size(), av_samples_fill_arrays()
1911 * - encoding: unused
1912 * - decoding: Set by libavcodec, user can override.
1914 * @deprecated use get_buffer2()
1916 attribute_deprecated
1917 int (*get_buffer)(struct AVCodecContext *c, AVFrame *pic);
1920 * Called to release buffers which were allocated with get_buffer.
1921 * A released buffer can be reused in get_buffer().
1922 * pic.data[*] must be set to NULL.
1923 * May be called from a different thread if frame multithreading is used,
1924 * but not by more than one thread at once, so does not need to be reentrant.
1925 * - encoding: unused
1926 * - decoding: Set by libavcodec, user can override.
1928 * @deprecated custom freeing callbacks should be set from get_buffer2()
1930 attribute_deprecated
1931 void (*release_buffer)(struct AVCodecContext *c, AVFrame *pic);
1934 * Called at the beginning of a frame to get cr buffer for it.
1935 * Buffer type (size, hints) must be the same. libavcodec won't check it.
1936 * libavcodec will pass previous buffer in pic, function should return
1937 * same buffer or new buffer with old frame "painted" into it.
1938 * If pic.data[0] == NULL must behave like get_buffer().
1939 * if CODEC_CAP_DR1 is not set then reget_buffer() must call
1940 * avcodec_default_reget_buffer() instead of providing buffers allocated by
1942 * - encoding: unused
1943 * - decoding: Set by libavcodec, user can override.
1945 attribute_deprecated
1946 int (*reget_buffer)(struct AVCodecContext *c, AVFrame *pic);
1950 * This callback is called at the beginning of each frame to get data
1951 * buffer(s) for it. There may be one contiguous buffer for all the data or
1952 * there may be a buffer per each data plane or anything in between. What
1953 * this means is, you may set however many entries in buf[] you feel necessary.
1954 * Each buffer must be reference-counted using the AVBuffer API (see description
1957 * The following fields will be set in the frame before this callback is
1960 * - width, height (video only)
1961 * - sample_rate, channel_layout, nb_samples (audio only)
1962 * Their values may differ from the corresponding values in
1963 * AVCodecContext. This callback must use the frame values, not the codec
1964 * context values, to calculate the required buffer size.
1966 * This callback must fill the following fields in the frame:
1970 * * if the data is planar audio with more than 8 channels, then this
1971 * callback must allocate and fill extended_data to contain all pointers
1972 * to all data planes. data[] must hold as many pointers as it can.
1973 * extended_data must be allocated with av_malloc() and will be freed in
1975 * * otherwise exended_data must point to data
1976 * - buf[] must contain one or more pointers to AVBufferRef structures. Each of
1977 * the frame's data and extended_data pointers must be contained in these. That
1978 * is, one AVBufferRef for each allocated chunk of memory, not necessarily one
1979 * AVBufferRef per data[] entry. See: av_buffer_create(), av_buffer_alloc(),
1980 * and av_buffer_ref().
1981 * - extended_buf and nb_extended_buf must be allocated with av_malloc() by
1982 * this callback and filled with the extra buffers if there are more
1983 * buffers than buf[] can hold. extended_buf will be freed in
1986 * If CODEC_CAP_DR1 is not set then get_buffer2() must call
1987 * avcodec_default_get_buffer2() instead of providing buffers allocated by
1990 * Each data plane must be aligned to the maximum required by the target
1993 * @see avcodec_default_get_buffer2()
1997 * If AV_GET_BUFFER_FLAG_REF is set in flags then the frame may be reused
1998 * (read and/or written to if it is writable) later by libavcodec.
2000 * If CODEC_FLAG_EMU_EDGE is not set in s->flags, the buffer must contain an
2001 * edge of the size returned by avcodec_get_edge_width() on all sides.
2003 * avcodec_align_dimensions2() should be used to find the required width and
2004 * height, as they normally need to be rounded up to the next multiple of 16.
2006 * If frame multithreading is used and thread_safe_callbacks is set,
2007 * this callback may be called from a different thread, but not from more
2008 * than one at once. Does not need to be reentrant.
2010 * @see avcodec_align_dimensions2()
2014 * Decoders request a buffer of a particular size by setting
2015 * AVFrame.nb_samples prior to calling get_buffer2(). The decoder may,
2016 * however, utilize only part of the buffer by setting AVFrame.nb_samples
2017 * to a smaller value in the output frame.
2019 * As a convenience, av_samples_get_buffer_size() and
2020 * av_samples_fill_arrays() in libavutil may be used by custom get_buffer2()
2021 * functions to find the required data size and to fill data pointers and
2022 * linesize. In AVFrame.linesize, only linesize[0] may be set for audio
2023 * since all planes must be the same size.
2025 * @see av_samples_get_buffer_size(), av_samples_fill_arrays()
2027 * - encoding: unused
2028 * - decoding: Set by libavcodec, user can override.
2030 int (*get_buffer2)(struct AVCodecContext *s, AVFrame *frame, int flags);
2033 * If non-zero, the decoded audio and video frames returned from
2034 * avcodec_decode_video2() and avcodec_decode_audio4() are reference-counted
2035 * and are valid indefinitely. The caller must free them with
2036 * av_frame_unref() when they are not needed anymore.
2037 * Otherwise, the decoded frames must not be freed by the caller and are
2038 * only valid until the next decode call.
2040 * - encoding: unused
2041 * - decoding: set by the caller before avcodec_open2().
2043 int refcounted_frames;
2045 /* - encoding parameters */
2046 float qcompress; ///< amount of qscale change between easy & hard scenes (0.0-1.0)
2047 float qblur; ///< amount of qscale smoothing over time (0.0-1.0)
2051 * - encoding: Set by user.
2052 * - decoding: unused
2058 * - encoding: Set by user.
2059 * - decoding: unused
2064 * maximum quantizer difference between frames
2065 * - encoding: Set by user.
2066 * - decoding: unused
2071 * ratecontrol qmin qmax limiting method
2072 * 0-> clipping, 1-> use a nice continuous function to limit qscale wthin qmin/qmax.
2073 * - encoding: Set by user.
2074 * - decoding: unused
2082 * decoder bitstream buffer size
2083 * - encoding: Set by user.
2084 * - decoding: unused
2089 * ratecontrol override, see RcOverride
2090 * - encoding: Allocated/set/freed by user.
2091 * - decoding: unused
2093 int rc_override_count;
2094 RcOverride *rc_override;
2097 * rate control equation
2098 * - encoding: Set by user
2099 * - decoding: unused
2105 * - encoding: Set by user.
2106 * - decoding: unused
2112 * - encoding: Set by user.
2113 * - decoding: unused
2117 float rc_buffer_aggressivity;
2120 * initial complexity for pass1 ratecontrol
2121 * - encoding: Set by user.
2122 * - decoding: unused
2124 float rc_initial_cplx;
2127 * Ratecontrol attempt to use, at maximum, <value> of what can be used without an underflow.
2128 * - encoding: Set by user.
2129 * - decoding: unused.
2131 float rc_max_available_vbv_use;
2134 * Ratecontrol attempt to use, at least, <value> times the amount needed to prevent a vbv overflow.
2135 * - encoding: Set by user.
2136 * - decoding: unused.
2138 float rc_min_vbv_overflow_use;
2141 * Number of bits which should be loaded into the rc buffer before decoding starts.
2142 * - encoding: Set by user.
2143 * - decoding: unused
2145 int rc_initial_buffer_occupancy;
2147 #define FF_CODER_TYPE_VLC 0
2148 #define FF_CODER_TYPE_AC 1
2149 #define FF_CODER_TYPE_RAW 2
2150 #define FF_CODER_TYPE_RLE 3
2151 #define FF_CODER_TYPE_DEFLATE 4
2154 * - encoding: Set by user.
2155 * - decoding: unused
2161 * - encoding: Set by user.
2162 * - decoding: unused
2167 * minimum Lagrange multipler
2168 * - encoding: Set by user.
2169 * - decoding: unused
2174 * maximum Lagrange multipler
2175 * - encoding: Set by user.
2176 * - decoding: unused
2181 * frame skip threshold
2182 * - encoding: Set by user.
2183 * - decoding: unused
2185 int frame_skip_threshold;
2189 * - encoding: Set by user.
2190 * - decoding: unused
2192 int frame_skip_factor;
2195 * frame skip exponent
2196 * - encoding: Set by user.
2197 * - decoding: unused
2202 * frame skip comparison function
2203 * - encoding: Set by user.
2204 * - decoding: unused
2209 * trellis RD quantization
2210 * - encoding: Set by user.
2211 * - decoding: unused
2216 * - encoding: Set by user.
2217 * - decoding: unused
2219 int min_prediction_order;
2222 * - encoding: Set by user.
2223 * - decoding: unused
2225 int max_prediction_order;
2228 * GOP timecode frame start number, in non drop frame format
2229 * - encoding: Set by user.
2230 * - decoding: unused
2232 int64_t timecode_frame_start;
2234 /* The RTP callback: This function is called */
2235 /* every time the encoder has a packet to send. */
2236 /* It depends on the encoder if the data starts */
2237 /* with a Start Code (it should). H.263 does. */
2238 /* mb_nb contains the number of macroblocks */
2239 /* encoded in the RTP payload. */
2240 void (*rtp_callback)(struct AVCodecContext *avctx, void *data, int size, int mb_nb);
2242 int rtp_payload_size; /* The size of the RTP payload: the coder will */
2243 /* do its best to deliver a chunk with size */
2244 /* below rtp_payload_size, the chunk will start */
2245 /* with a start code on some codecs like H.263. */
2246 /* This doesn't take account of any particular */
2247 /* headers inside the transmitted RTP payload. */
2249 /* statistics, used for 2-pass encoding */
2260 * number of bits used for the previously encoded frame
2261 * - encoding: Set by libavcodec.
2262 * - decoding: unused
2267 * pass1 encoding statistics output buffer
2268 * - encoding: Set by libavcodec.
2269 * - decoding: unused
2274 * pass2 encoding statistics input buffer
2275 * Concatenated stuff from stats_out of pass1 should be placed here.
2276 * - encoding: Allocated/set/freed by user.
2277 * - decoding: unused
2282 * Work around bugs in encoders which sometimes cannot be detected automatically.
2283 * - encoding: Set by user
2284 * - decoding: Set by user
2286 int workaround_bugs;
2287 #define FF_BUG_AUTODETECT 1 ///< autodetection
2288 #if FF_API_OLD_MSMPEG4
2289 #define FF_BUG_OLD_MSMPEG4 2
2291 #define FF_BUG_XVID_ILACE 4
2292 #define FF_BUG_UMP4 8
2293 #define FF_BUG_NO_PADDING 16
2294 #define FF_BUG_AMV 32
2296 #define FF_BUG_AC_VLC 0 ///< Will be removed, libavcodec can now handle these non-compliant files by default.
2298 #define FF_BUG_QPEL_CHROMA 64
2299 #define FF_BUG_STD_QPEL 128
2300 #define FF_BUG_QPEL_CHROMA2 256
2301 #define FF_BUG_DIRECT_BLOCKSIZE 512
2302 #define FF_BUG_EDGE 1024
2303 #define FF_BUG_HPEL_CHROMA 2048
2304 #define FF_BUG_DC_CLIP 4096
2305 #define FF_BUG_MS 8192 ///< Work around various bugs in Microsoft's broken decoders.
2306 #define FF_BUG_TRUNCATED 16384
2309 * strictly follow the standard (MPEG4, ...).
2310 * - encoding: Set by user.
2311 * - decoding: Set by user.
2312 * Setting this to STRICT or higher means the encoder and decoder will
2313 * generally do stupid things, whereas setting it to unofficial or lower
2314 * will mean the encoder might produce output that is not supported by all
2315 * spec-compliant decoders. Decoders don't differentiate between normal,
2316 * unofficial and experimental (that is, they always try to decode things
2317 * when they can) unless they are explicitly asked to behave stupidly
2318 * (=strictly conform to the specs)
2320 int strict_std_compliance;
2321 #define FF_COMPLIANCE_VERY_STRICT 2 ///< Strictly conform to an older more strict version of the spec or reference software.
2322 #define FF_COMPLIANCE_STRICT 1 ///< Strictly conform to all the things in the spec no matter what consequences.
2323 #define FF_COMPLIANCE_NORMAL 0
2324 #define FF_COMPLIANCE_UNOFFICIAL -1 ///< Allow unofficial extensions
2325 #define FF_COMPLIANCE_EXPERIMENTAL -2 ///< Allow nonstandardized experimental things.
2328 * error concealment flags
2329 * - encoding: unused
2330 * - decoding: Set by user.
2332 int error_concealment;
2333 #define FF_EC_GUESS_MVS 1
2334 #define FF_EC_DEBLOCK 2
2338 * - encoding: Set by user.
2339 * - decoding: Set by user.
2342 #define FF_DEBUG_PICT_INFO 1
2343 #define FF_DEBUG_RC 2
2344 #define FF_DEBUG_BITSTREAM 4
2345 #define FF_DEBUG_MB_TYPE 8
2346 #define FF_DEBUG_QP 16
2349 * @deprecated this option does nothing
2351 #define FF_DEBUG_MV 32
2353 #define FF_DEBUG_DCT_COEFF 0x00000040
2354 #define FF_DEBUG_SKIP 0x00000080
2355 #define FF_DEBUG_STARTCODE 0x00000100
2356 #define FF_DEBUG_PTS 0x00000200
2357 #define FF_DEBUG_ER 0x00000400
2358 #define FF_DEBUG_MMCO 0x00000800
2359 #define FF_DEBUG_BUGS 0x00001000
2361 #define FF_DEBUG_VIS_QP 0x00002000
2362 #define FF_DEBUG_VIS_MB_TYPE 0x00004000
2364 #define FF_DEBUG_BUFFERS 0x00008000
2365 #define FF_DEBUG_THREADS 0x00010000
2369 * @deprecated this option does not have any effect
2371 attribute_deprecated
2373 #define FF_DEBUG_VIS_MV_P_FOR 0x00000001 //visualize forward predicted MVs of P frames
2374 #define FF_DEBUG_VIS_MV_B_FOR 0x00000002 //visualize forward predicted MVs of B frames
2375 #define FF_DEBUG_VIS_MV_B_BACK 0x00000004 //visualize backward predicted MVs of B frames
2379 * Error recognition; may misdetect some more or less valid parts as errors.
2380 * - encoding: unused
2381 * - decoding: Set by user.
2383 int err_recognition;
2386 * Verify checksums embedded in the bitstream (could be of either encoded or
2387 * decoded data, depending on the codec) and print an error message on mismatch.
2388 * If AV_EF_EXPLODE is also set, a mismatching checksum will result in the
2389 * decoder returning an error.
2391 #define AV_EF_CRCCHECK (1<<0)
2392 #define AV_EF_BITSTREAM (1<<1)
2393 #define AV_EF_BUFFER (1<<2)
2394 #define AV_EF_EXPLODE (1<<3)
2397 * opaque 64bit number (generally a PTS) that will be reordered and
2398 * output in AVFrame.reordered_opaque
2399 * @deprecated in favor of pkt_pts
2400 * - encoding: unused
2401 * - decoding: Set by user.
2403 int64_t reordered_opaque;
2406 * Hardware accelerator in use
2407 * - encoding: unused.
2408 * - decoding: Set by libavcodec
2410 struct AVHWAccel *hwaccel;
2413 * Hardware accelerator context.
2414 * For some hardware accelerators, a global context needs to be
2415 * provided by the user. In that case, this holds display-dependent
2416 * data Libav cannot instantiate itself. Please refer to the
2417 * Libav HW accelerator documentation to know how to fill this
2418 * is. e.g. for VA API, this is a struct vaapi_context.
2419 * - encoding: unused
2420 * - decoding: Set by user
2422 void *hwaccel_context;
2426 * - encoding: Set by libavcodec if flags&CODEC_FLAG_PSNR.
2427 * - decoding: unused
2429 uint64_t error[AV_NUM_DATA_POINTERS];
2432 * DCT algorithm, see FF_DCT_* below
2433 * - encoding: Set by user.
2434 * - decoding: unused
2437 #define FF_DCT_AUTO 0
2438 #define FF_DCT_FASTINT 1
2439 #define FF_DCT_INT 2
2440 #define FF_DCT_MMX 3
2441 #define FF_DCT_ALTIVEC 5
2442 #define FF_DCT_FAAN 6
2445 * IDCT algorithm, see FF_IDCT_* below.
2446 * - encoding: Set by user.
2447 * - decoding: Set by user.
2450 #define FF_IDCT_AUTO 0
2451 #define FF_IDCT_INT 1
2452 #define FF_IDCT_SIMPLE 2
2453 #define FF_IDCT_SIMPLEMMX 3
2454 #define FF_IDCT_ARM 7
2455 #define FF_IDCT_ALTIVEC 8
2456 #define FF_IDCT_SH4 9
2457 #define FF_IDCT_SIMPLEARM 10
2458 #define FF_IDCT_IPP 13
2459 #define FF_IDCT_XVIDMMX 14
2460 #define FF_IDCT_SIMPLEARMV5TE 16
2461 #define FF_IDCT_SIMPLEARMV6 17
2462 #define FF_IDCT_SIMPLEVIS 18
2463 #define FF_IDCT_FAAN 20
2464 #define FF_IDCT_SIMPLENEON 22
2465 #if FF_API_ARCH_ALPHA
2466 #define FF_IDCT_SIMPLEALPHA 23
2470 * bits per sample/pixel from the demuxer (needed for huffyuv).
2471 * - encoding: Set by libavcodec.
2472 * - decoding: Set by user.
2474 int bits_per_coded_sample;
2477 * Bits per sample/pixel of internal libavcodec pixel/sample format.
2478 * - encoding: set by user.
2479 * - decoding: set by libavcodec.
2481 int bits_per_raw_sample;
2485 * low resolution decoding, 1-> 1/2 size, 2->1/4 size
2486 * - encoding: unused
2487 * - decoding: Set by user.
2489 * @deprecated use decoder private options instead
2491 attribute_deprecated int lowres;
2495 * the picture in the bitstream
2496 * - encoding: Set by libavcodec.
2497 * - decoding: Set by libavcodec.
2499 AVFrame *coded_frame;
2503 * is used to decide how many independent tasks should be passed to execute()
2504 * - encoding: Set by user.
2505 * - decoding: Set by user.
2510 * Which multithreading methods to use.
2511 * Use of FF_THREAD_FRAME will increase decoding delay by one frame per thread,
2512 * so clients which cannot provide future frames should not use it.
2514 * - encoding: Set by user, otherwise the default is used.
2515 * - decoding: Set by user, otherwise the default is used.
2518 #define FF_THREAD_FRAME 1 ///< Decode more than one frame at once
2519 #define FF_THREAD_SLICE 2 ///< Decode more than one part of a single frame at once
2522 * Which multithreading methods are in use by the codec.
2523 * - encoding: Set by libavcodec.
2524 * - decoding: Set by libavcodec.
2526 int active_thread_type;
2529 * Set by the client if its custom get_buffer() callback can be called
2530 * synchronously from another thread, which allows faster multithreaded decoding.
2531 * draw_horiz_band() will be called from other threads regardless of this setting.
2532 * Ignored if the default get_buffer() is used.
2533 * - encoding: Set by user.
2534 * - decoding: Set by user.
2536 int thread_safe_callbacks;
2539 * The codec may call this to execute several independent things.
2540 * It will return only after finishing all tasks.
2541 * The user may replace this with some multithreaded implementation,
2542 * the default implementation will execute the parts serially.
2543 * @param count the number of things to execute
2544 * - encoding: Set by libavcodec, user can override.
2545 * - decoding: Set by libavcodec, user can override.
2547 int (*execute)(struct AVCodecContext *c, int (*func)(struct AVCodecContext *c2, void *arg), void *arg2, int *ret, int count, int size);
2550 * The codec may call this to execute several independent things.
2551 * It will return only after finishing all tasks.
2552 * The user may replace this with some multithreaded implementation,
2553 * the default implementation will execute the parts serially.
2554 * Also see avcodec_thread_init and e.g. the --enable-pthread configure option.
2555 * @param c context passed also to func
2556 * @param count the number of things to execute
2557 * @param arg2 argument passed unchanged to func
2558 * @param ret return values of executed functions, must have space for "count" values. May be NULL.
2559 * @param func function that will be called count times, with jobnr from 0 to count-1.
2560 * threadnr will be in the range 0 to c->thread_count-1 < MAX_THREADS and so that no
2561 * two instances of func executing at the same time will have the same threadnr.
2562 * @return always 0 currently, but code should handle a future improvement where when any call to func
2563 * returns < 0 no further calls to func may be done and < 0 is returned.
2564 * - encoding: Set by libavcodec, user can override.
2565 * - decoding: Set by libavcodec, user can override.
2567 int (*execute2)(struct AVCodecContext *c, int (*func)(struct AVCodecContext *c2, void *arg, int jobnr, int threadnr), void *arg2, int *ret, int count);
2569 #if FF_API_THREAD_OPAQUE
2571 * @deprecated this field should not be used from outside of lavc
2573 attribute_deprecated
2574 void *thread_opaque;
2578 * noise vs. sse weight for the nsse comparsion function
2579 * - encoding: Set by user.
2580 * - decoding: unused
2586 * - encoding: Set by user.
2587 * - decoding: Set by libavcodec.
2590 #define FF_PROFILE_UNKNOWN -99
2591 #define FF_PROFILE_RESERVED -100
2593 #define FF_PROFILE_AAC_MAIN 0
2594 #define FF_PROFILE_AAC_LOW 1
2595 #define FF_PROFILE_AAC_SSR 2
2596 #define FF_PROFILE_AAC_LTP 3
2597 #define FF_PROFILE_AAC_HE 4
2598 #define FF_PROFILE_AAC_HE_V2 28
2599 #define FF_PROFILE_AAC_LD 22
2600 #define FF_PROFILE_AAC_ELD 38
2601 #define FF_PROFILE_MPEG2_AAC_LOW 128
2602 #define FF_PROFILE_MPEG2_AAC_HE 131
2604 #define FF_PROFILE_DTS 20
2605 #define FF_PROFILE_DTS_ES 30
2606 #define FF_PROFILE_DTS_96_24 40
2607 #define FF_PROFILE_DTS_HD_HRA 50
2608 #define FF_PROFILE_DTS_HD_MA 60
2610 #define FF_PROFILE_MPEG2_422 0
2611 #define FF_PROFILE_MPEG2_HIGH 1
2612 #define FF_PROFILE_MPEG2_SS 2
2613 #define FF_PROFILE_MPEG2_SNR_SCALABLE 3
2614 #define FF_PROFILE_MPEG2_MAIN 4
2615 #define FF_PROFILE_MPEG2_SIMPLE 5
2617 #define FF_PROFILE_H264_CONSTRAINED (1<<9) // 8+1; constraint_set1_flag
2618 #define FF_PROFILE_H264_INTRA (1<<11) // 8+3; constraint_set3_flag
2620 #define FF_PROFILE_H264_BASELINE 66
2621 #define FF_PROFILE_H264_CONSTRAINED_BASELINE (66|FF_PROFILE_H264_CONSTRAINED)
2622 #define FF_PROFILE_H264_MAIN 77
2623 #define FF_PROFILE_H264_EXTENDED 88
2624 #define FF_PROFILE_H264_HIGH 100
2625 #define FF_PROFILE_H264_HIGH_10 110
2626 #define FF_PROFILE_H264_HIGH_10_INTRA (110|FF_PROFILE_H264_INTRA)
2627 #define FF_PROFILE_H264_HIGH_422 122
2628 #define FF_PROFILE_H264_HIGH_422_INTRA (122|FF_PROFILE_H264_INTRA)
2629 #define FF_PROFILE_H264_HIGH_444 144
2630 #define FF_PROFILE_H264_HIGH_444_PREDICTIVE 244
2631 #define FF_PROFILE_H264_HIGH_444_INTRA (244|FF_PROFILE_H264_INTRA)
2632 #define FF_PROFILE_H264_CAVLC_444 44
2634 #define FF_PROFILE_VC1_SIMPLE 0
2635 #define FF_PROFILE_VC1_MAIN 1
2636 #define FF_PROFILE_VC1_COMPLEX 2
2637 #define FF_PROFILE_VC1_ADVANCED 3
2639 #define FF_PROFILE_MPEG4_SIMPLE 0
2640 #define FF_PROFILE_MPEG4_SIMPLE_SCALABLE 1
2641 #define FF_PROFILE_MPEG4_CORE 2
2642 #define FF_PROFILE_MPEG4_MAIN 3
2643 #define FF_PROFILE_MPEG4_N_BIT 4
2644 #define FF_PROFILE_MPEG4_SCALABLE_TEXTURE 5
2645 #define FF_PROFILE_MPEG4_SIMPLE_FACE_ANIMATION 6
2646 #define FF_PROFILE_MPEG4_BASIC_ANIMATED_TEXTURE 7
2647 #define FF_PROFILE_MPEG4_HYBRID 8
2648 #define FF_PROFILE_MPEG4_ADVANCED_REAL_TIME 9
2649 #define FF_PROFILE_MPEG4_CORE_SCALABLE 10
2650 #define FF_PROFILE_MPEG4_ADVANCED_CODING 11
2651 #define FF_PROFILE_MPEG4_ADVANCED_CORE 12
2652 #define FF_PROFILE_MPEG4_ADVANCED_SCALABLE_TEXTURE 13
2653 #define FF_PROFILE_MPEG4_SIMPLE_STUDIO 14
2654 #define FF_PROFILE_MPEG4_ADVANCED_SIMPLE 15
2656 #define FF_PROFILE_JPEG2000_CSTREAM_RESTRICTION_0 0
2657 #define FF_PROFILE_JPEG2000_CSTREAM_RESTRICTION_1 1
2658 #define FF_PROFILE_JPEG2000_CSTREAM_NO_RESTRICTION 2
2659 #define FF_PROFILE_JPEG2000_DCINEMA_2K 3
2660 #define FF_PROFILE_JPEG2000_DCINEMA_4K 4
2664 * - encoding: Set by user.
2665 * - decoding: Set by libavcodec.
2668 #define FF_LEVEL_UNKNOWN -99
2672 * - encoding: unused
2673 * - decoding: Set by user.
2675 enum AVDiscard skip_loop_filter;
2679 * - encoding: unused
2680 * - decoding: Set by user.
2682 enum AVDiscard skip_idct;
2686 * - encoding: unused
2687 * - decoding: Set by user.
2689 enum AVDiscard skip_frame;
2692 * Header containing style information for text subtitles.
2693 * For SUBTITLE_ASS subtitle type, it should contain the whole ASS
2694 * [Script Info] and [V4+ Styles] section, plus the [Events] line and
2695 * the Format line following. It shouldn't include any Dialogue line.
2696 * - encoding: Set/allocated/freed by user (before avcodec_open2())
2697 * - decoding: Set/allocated/freed by libavcodec (by avcodec_open2())
2699 uint8_t *subtitle_header;
2700 int subtitle_header_size;
2702 #if FF_API_ERROR_RATE
2704 * @deprecated use the 'error_rate' private AVOption of the mpegvideo
2707 attribute_deprecated
2711 #if FF_API_CODEC_PKT
2713 * @deprecated this field is not supposed to be accessed from outside lavc
2715 attribute_deprecated
2720 * VBV delay coded in the last frame (in periods of a 27 MHz clock).
2721 * Used for compliant TS muxing.
2722 * - encoding: Set by libavcodec.
2723 * - decoding: unused.
2731 typedef struct AVProfile {
2733 const char *name; ///< short name for the profile
2736 typedef struct AVCodecDefault AVCodecDefault;
2743 typedef struct AVCodec {
2745 * Name of the codec implementation.
2746 * The name is globally unique among encoders and among decoders (but an
2747 * encoder and a decoder can share the same name).
2748 * This is the primary way to find a codec from the user perspective.
2752 * Descriptive name for the codec, meant to be more human readable than name.
2753 * You should use the NULL_IF_CONFIG_SMALL() macro to define it.
2755 const char *long_name;
2756 enum AVMediaType type;
2759 * Codec capabilities.
2763 const AVRational *supported_framerates; ///< array of supported framerates, or NULL if any, array is terminated by {0,0}
2764 const enum AVPixelFormat *pix_fmts; ///< array of supported pixel formats, or NULL if unknown, array is terminated by -1
2765 const int *supported_samplerates; ///< array of supported audio samplerates, or NULL if unknown, array is terminated by 0
2766 const enum AVSampleFormat *sample_fmts; ///< array of supported sample formats, or NULL if unknown, array is terminated by -1
2767 const uint64_t *channel_layouts; ///< array of support channel layouts, or NULL if unknown. array is terminated by 0
2769 attribute_deprecated uint8_t max_lowres; ///< maximum value for lowres supported by the decoder
2771 const AVClass *priv_class; ///< AVClass for the private context
2772 const AVProfile *profiles; ///< array of recognized profiles, or NULL if unknown, array is terminated by {FF_PROFILE_UNKNOWN}
2774 /*****************************************************************
2775 * No fields below this line are part of the public API. They
2776 * may not be used outside of libavcodec and can be changed and
2778 * New public fields should be added right above.
2779 *****************************************************************
2782 struct AVCodec *next;
2784 * @name Frame-level threading support functions
2788 * If defined, called on thread contexts when they are created.
2789 * If the codec allocates writable tables in init(), re-allocate them here.
2790 * priv_data will be set to a copy of the original.
2792 int (*init_thread_copy)(AVCodecContext *);
2794 * Copy necessary context variables from a previous thread context to the current one.
2795 * If not defined, the next thread will start automatically; otherwise, the codec
2796 * must call ff_thread_finish_setup().
2798 * dst and src will (rarely) point to the same context, in which case memcpy should be skipped.
2800 int (*update_thread_context)(AVCodecContext *dst, const AVCodecContext *src);
2804 * Private codec-specific defaults.
2806 const AVCodecDefault *defaults;
2809 * Initialize codec static data, called from avcodec_register().
2811 void (*init_static_data)(struct AVCodec *codec);
2813 int (*init)(AVCodecContext *);
2814 int (*encode_sub)(AVCodecContext *, uint8_t *buf, int buf_size,
2815 const struct AVSubtitle *sub);
2817 * Encode data to an AVPacket.
2819 * @param avctx codec context
2820 * @param avpkt output AVPacket (may contain a user-provided buffer)
2821 * @param[in] frame AVFrame containing the raw data to be encoded
2822 * @param[out] got_packet_ptr encoder sets to 0 or 1 to indicate that a
2823 * non-empty packet was returned in avpkt.
2824 * @return 0 on success, negative error code on failure
2826 int (*encode2)(AVCodecContext *avctx, AVPacket *avpkt, const AVFrame *frame,
2827 int *got_packet_ptr);
2828 int (*decode)(AVCodecContext *, void *outdata, int *outdata_size, AVPacket *avpkt);
2829 int (*close)(AVCodecContext *);
2832 * Will be called when seeking
2834 void (*flush)(AVCodecContext *);
2840 typedef struct AVHWAccel {
2842 * Name of the hardware accelerated codec.
2843 * The name is globally unique among encoders and among decoders (but an
2844 * encoder and a decoder can share the same name).
2849 * Type of codec implemented by the hardware accelerator.
2851 * See AVMEDIA_TYPE_xxx
2853 enum AVMediaType type;
2856 * Codec implemented by the hardware accelerator.
2858 * See AV_CODEC_ID_xxx
2863 * Supported pixel format.
2865 * Only hardware accelerated formats are supported here.
2867 enum AVPixelFormat pix_fmt;
2870 * Hardware accelerated codec capabilities.
2871 * see FF_HWACCEL_CODEC_CAP_*
2875 struct AVHWAccel *next;
2878 * Called at the beginning of each frame or field picture.
2880 * Meaningful frame information (codec specific) is guaranteed to
2881 * be parsed at this point. This function is mandatory.
2883 * Note that buf can be NULL along with buf_size set to 0.
2884 * Otherwise, this means the whole frame is available at this point.
2886 * @param avctx the codec context
2887 * @param buf the frame data buffer base
2888 * @param buf_size the size of the frame in bytes
2889 * @return zero if successful, a negative value otherwise
2891 int (*start_frame)(AVCodecContext *avctx, const uint8_t *buf, uint32_t buf_size);
2894 * Callback for each slice.
2896 * Meaningful slice information (codec specific) is guaranteed to
2897 * be parsed at this point. This function is mandatory.
2899 * @param avctx the codec context
2900 * @param buf the slice data buffer base
2901 * @param buf_size the size of the slice in bytes
2902 * @return zero if successful, a negative value otherwise
2904 int (*decode_slice)(AVCodecContext *avctx, const uint8_t *buf, uint32_t buf_size);
2907 * Called at the end of each frame or field picture.
2909 * The whole picture is parsed at this point and can now be sent
2910 * to the hardware accelerator. This function is mandatory.
2912 * @param avctx the codec context
2913 * @return zero if successful, a negative value otherwise
2915 int (*end_frame)(AVCodecContext *avctx);
2918 * Size of HW accelerator private data.
2920 * Private data is allocated with av_mallocz() before
2921 * AVCodecContext.get_buffer() and deallocated after
2922 * AVCodecContext.release_buffer().
2928 * @defgroup lavc_picture AVPicture
2930 * Functions for working with AVPicture
2935 * four components are given, that's all.
2936 * the last component is alpha
2938 typedef struct AVPicture {
2939 uint8_t *data[AV_NUM_DATA_POINTERS];
2940 int linesize[AV_NUM_DATA_POINTERS]; ///< number of bytes per line
2947 #define AVPALETTE_SIZE 1024
2948 #define AVPALETTE_COUNT 256
2950 enum AVSubtitleType {
2953 SUBTITLE_BITMAP, ///< A bitmap, pict will be set
2956 * Plain text, the text field must be set by the decoder and is
2957 * authoritative. ass and pict fields may contain approximations.
2962 * Formatted text, the ass field must be set by the decoder and is
2963 * authoritative. pict and text fields may contain approximations.
2968 #define AV_SUBTITLE_FLAG_FORCED 0x00000001
2970 typedef struct AVSubtitleRect {
2971 int x; ///< top left corner of pict, undefined when pict is not set
2972 int y; ///< top left corner of pict, undefined when pict is not set
2973 int w; ///< width of pict, undefined when pict is not set
2974 int h; ///< height of pict, undefined when pict is not set
2975 int nb_colors; ///< number of colors in pict, undefined when pict is not set
2978 * data+linesize for the bitmap of this subtitle.
2979 * can be set for text/ass as well once they where rendered
2982 enum AVSubtitleType type;
2984 char *text; ///< 0 terminated plain UTF-8 text
2987 * 0 terminated ASS/SSA compatible event line.
2988 * The pressentation of this is unaffected by the other values in this
2995 typedef struct AVSubtitle {
2996 uint16_t format; /* 0 = graphics */
2997 uint32_t start_display_time; /* relative to packet pts, in ms */
2998 uint32_t end_display_time; /* relative to packet pts, in ms */
3000 AVSubtitleRect **rects;
3001 int64_t pts; ///< Same as packet pts, in AV_TIME_BASE
3005 * If c is NULL, returns the first registered codec,
3006 * if c is non-NULL, returns the next registered codec after c,
3007 * or NULL if c is the last one.
3009 AVCodec *av_codec_next(const AVCodec *c);
3012 * Return the LIBAVCODEC_VERSION_INT constant.
3014 unsigned avcodec_version(void);
3017 * Return the libavcodec build-time configuration.
3019 const char *avcodec_configuration(void);
3022 * Return the libavcodec license.
3024 const char *avcodec_license(void);
3027 * Register the codec codec and initialize libavcodec.
3029 * @warning either this function or avcodec_register_all() must be called
3030 * before any other libavcodec functions.
3032 * @see avcodec_register_all()
3034 void avcodec_register(AVCodec *codec);
3037 * Register all the codecs, parsers and bitstream filters which were enabled at
3038 * configuration time. If you do not call this function you can select exactly
3039 * which formats you want to support, by using the individual registration
3042 * @see avcodec_register
3043 * @see av_register_codec_parser
3044 * @see av_register_bitstream_filter
3046 void avcodec_register_all(void);
3049 * Allocate an AVCodecContext and set its fields to default values. The
3050 * resulting struct can be deallocated by calling avcodec_close() on it followed
3053 * @param codec if non-NULL, allocate private data and initialize defaults
3054 * for the given codec. It is illegal to then call avcodec_open2()
3055 * with a different codec.
3056 * If NULL, then the codec-specific defaults won't be initialized,
3057 * which may result in suboptimal default settings (this is
3058 * important mainly for encoders, e.g. libx264).
3060 * @return An AVCodecContext filled with default values or NULL on failure.
3061 * @see avcodec_get_context_defaults
3063 AVCodecContext *avcodec_alloc_context3(const AVCodec *codec);
3066 * Set the fields of the given AVCodecContext to default values corresponding
3067 * to the given codec (defaults may be codec-dependent).
3069 * Do not call this function if a non-NULL codec has been passed
3070 * to avcodec_alloc_context3() that allocated this AVCodecContext.
3071 * If codec is non-NULL, it is illegal to call avcodec_open2() with a
3072 * different codec on this AVCodecContext.
3074 int avcodec_get_context_defaults3(AVCodecContext *s, const AVCodec *codec);
3077 * Get the AVClass for AVCodecContext. It can be used in combination with
3078 * AV_OPT_SEARCH_FAKE_OBJ for examining options.
3080 * @see av_opt_find().
3082 const AVClass *avcodec_get_class(void);
3085 * Copy the settings of the source AVCodecContext into the destination
3086 * AVCodecContext. The resulting destination codec context will be
3087 * unopened, i.e. you are required to call avcodec_open2() before you
3088 * can use this AVCodecContext to decode/encode video/audio data.
3090 * @param dest target codec context, should be initialized with
3091 * avcodec_alloc_context3(), but otherwise uninitialized
3092 * @param src source codec context
3093 * @return AVERROR() on error (e.g. memory allocation error), 0 on success
3095 int avcodec_copy_context(AVCodecContext *dest, const AVCodecContext *src);
3098 * Allocate an AVFrame and set its fields to default values. The resulting
3099 * struct must be freed using avcodec_free_frame().
3101 * @return An AVFrame filled with default values or NULL on failure.
3102 * @see avcodec_get_frame_defaults
3104 AVFrame *avcodec_alloc_frame(void);
3107 * Set the fields of the given AVFrame to default values.
3109 * @param frame The AVFrame of which the fields should be set to default values.
3111 void avcodec_get_frame_defaults(AVFrame *frame);
3114 * Free the frame and any dynamically allocated objects in it,
3115 * e.g. extended_data.
3117 * @param frame frame to be freed. The pointer will be set to NULL.
3119 * @warning this function does NOT free the data buffers themselves
3120 * (it does not know how, since they might have been allocated with
3121 * a custom get_buffer()).
3123 void avcodec_free_frame(AVFrame **frame);
3126 * Initialize the AVCodecContext to use the given AVCodec. Prior to using this
3127 * function the context has to be allocated with avcodec_alloc_context3().
3129 * The functions avcodec_find_decoder_by_name(), avcodec_find_encoder_by_name(),
3130 * avcodec_find_decoder() and avcodec_find_encoder() provide an easy way for
3131 * retrieving a codec.
3133 * @warning This function is not thread safe!
3136 * avcodec_register_all();
3137 * av_dict_set(&opts, "b", "2.5M", 0);
3138 * codec = avcodec_find_decoder(AV_CODEC_ID_H264);
3142 * context = avcodec_alloc_context3(codec);
3144 * if (avcodec_open2(context, codec, opts) < 0)
3148 * @param avctx The context to initialize.
3149 * @param codec The codec to open this context for. If a non-NULL codec has been
3150 * previously passed to avcodec_alloc_context3() or
3151 * avcodec_get_context_defaults3() for this context, then this
3152 * parameter MUST be either NULL or equal to the previously passed
3154 * @param options A dictionary filled with AVCodecContext and codec-private options.
3155 * On return this object will be filled with options that were not found.
3157 * @return zero on success, a negative value on error
3158 * @see avcodec_alloc_context3(), avcodec_find_decoder(), avcodec_find_encoder(),
3159 * av_dict_set(), av_opt_find().
3161 int avcodec_open2(AVCodecContext *avctx, const AVCodec *codec, AVDictionary **options);
3164 * Close a given AVCodecContext and free all the data associated with it
3165 * (but not the AVCodecContext itself).
3167 * Calling this function on an AVCodecContext that hasn't been opened will free
3168 * the codec-specific data allocated in avcodec_alloc_context3() /
3169 * avcodec_get_context_defaults3() with a non-NULL codec. Subsequent calls will
3172 int avcodec_close(AVCodecContext *avctx);
3175 * Free all allocated data in the given subtitle struct.
3177 * @param sub AVSubtitle to free.
3179 void avsubtitle_free(AVSubtitle *sub);
3186 * @addtogroup lavc_packet
3190 #if FF_API_DESTRUCT_PACKET
3192 * Default packet destructor.
3193 * @deprecated use the AVBuffer API instead
3195 attribute_deprecated
3196 void av_destruct_packet(AVPacket *pkt);
3200 * Initialize optional fields of a packet with default values.
3202 * Note, this does not touch the data and size members, which have to be
3203 * initialized separately.
3207 void av_init_packet(AVPacket *pkt);
3210 * Allocate the payload of a packet and initialize its fields with
3214 * @param size wanted payload size
3215 * @return 0 if OK, AVERROR_xxx otherwise
3217 int av_new_packet(AVPacket *pkt, int size);
3220 * Reduce packet size, correctly zeroing padding
3223 * @param size new size
3225 void av_shrink_packet(AVPacket *pkt, int size);
3228 * Increase packet size, correctly zeroing padding
3231 * @param grow_by number of bytes by which to increase the size of the packet
3233 int av_grow_packet(AVPacket *pkt, int grow_by);
3236 * Initialize a reference-counted packet from av_malloc()ed data.
3238 * @param pkt packet to be initialized. This function will set the data, size,
3239 * buf and destruct fields, all others are left untouched.
3240 * @param data Data allocated by av_malloc() to be used as packet data. If this
3241 * function returns successfully, the data is owned by the underlying AVBuffer.
3242 * The caller may not access the data through other means.
3243 * @param size size of data in bytes, without the padding. I.e. the full buffer
3244 * size is assumed to be size + FF_INPUT_BUFFER_PADDING_SIZE.
3246 * @return 0 on success, a negative AVERROR on error
3248 int av_packet_from_data(AVPacket *pkt, uint8_t *data, int size);
3251 * @warning This is a hack - the packet memory allocation stuff is broken. The
3252 * packet is allocated if it was not really allocated.
3254 int av_dup_packet(AVPacket *pkt);
3259 * @param pkt packet to free
3261 void av_free_packet(AVPacket *pkt);
3264 * Allocate new information of a packet.
3267 * @param type side information type
3268 * @param size side information size
3269 * @return pointer to fresh allocated data or NULL otherwise
3271 uint8_t* av_packet_new_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
3275 * Shrink the already allocated side data buffer
3278 * @param type side information type
3279 * @param size new side information size
3280 * @return 0 on success, < 0 on failure
3282 int av_packet_shrink_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
3286 * Get side information from packet.
3289 * @param type desired side information type
3290 * @param size pointer for side information size to store (optional)
3291 * @return pointer to data if present or NULL otherwise
3293 uint8_t* av_packet_get_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
3297 * Convenience function to free all the side data stored.
3298 * All the other fields stay untouched.
3302 void av_packet_free_side_data(AVPacket *pkt);
3305 * Setup a new reference to the data described by a given packet
3307 * If src is reference-counted, setup dst as a new reference to the
3308 * buffer in src. Otherwise allocate a new buffer in dst and copy the
3309 * data from src into it.
3311 * All the other fields are copied from src.
3313 * @see av_packet_unref
3315 * @param dst Destination packet
3316 * @param src Source packet
3318 * @return 0 on success, a negative AVERROR on error.
3320 int av_packet_ref(AVPacket *dst, AVPacket *src);
3325 * Unreference the buffer referenced by the packet and reset the
3326 * remaining packet fields to their default values.
3328 * @param pkt The packet to be unreferenced.
3330 void av_packet_unref(AVPacket *pkt);
3333 * Move every field in src to dst and reset src.
3335 * @see av_packet_unref
3337 * @param src Source packet, will be reset
3338 * @param dst Destination packet
3340 void av_packet_move_ref(AVPacket *dst, AVPacket *src);
3343 * Copy only "properties" fields from src to dst.
3345 * Properties for the purpose of this function are all the fields
3346 * beside those related to the packet data (buf, data, size)
3348 * @param dst Destination packet
3349 * @param src Source packet
3351 * @return 0 on success AVERROR on failure.
3354 int av_packet_copy_props(AVPacket *dst, const AVPacket *src);
3361 * @addtogroup lavc_decoding
3366 * Find a registered decoder with a matching codec ID.
3368 * @param id AVCodecID of the requested decoder
3369 * @return A decoder if one was found, NULL otherwise.
3371 AVCodec *avcodec_find_decoder(enum AVCodecID id);
3374 * Find a registered decoder with the specified name.
3376 * @param name name of the requested decoder
3377 * @return A decoder if one was found, NULL otherwise.
3379 AVCodec *avcodec_find_decoder_by_name(const char *name);
3381 #if FF_API_GET_BUFFER
3382 attribute_deprecated int avcodec_default_get_buffer(AVCodecContext *s, AVFrame *pic);
3383 attribute_deprecated void avcodec_default_release_buffer(AVCodecContext *s, AVFrame *pic);
3384 attribute_deprecated int avcodec_default_reget_buffer(AVCodecContext *s, AVFrame *pic);
3388 * The default callback for AVCodecContext.get_buffer2(). It is made public so
3389 * it can be called by custom get_buffer2() implementations for decoders without
3390 * CODEC_CAP_DR1 set.
3392 int avcodec_default_get_buffer2(AVCodecContext *s, AVFrame *frame, int flags);
3395 * Return the amount of padding in pixels which the get_buffer callback must
3396 * provide around the edge of the image for codecs which do not have the
3397 * CODEC_FLAG_EMU_EDGE flag.
3399 * @return Required padding in pixels.
3401 unsigned avcodec_get_edge_width(void);
3404 * Modify width and height values so that they will result in a memory
3405 * buffer that is acceptable for the codec if you do not use any horizontal
3408 * May only be used if a codec with CODEC_CAP_DR1 has been opened.
3409 * If CODEC_FLAG_EMU_EDGE is not set, the dimensions must have been increased
3410 * according to avcodec_get_edge_width() before.
3412 void avcodec_align_dimensions(AVCodecContext *s, int *width, int *height);
3415 * Modify width and height values so that they will result in a memory
3416 * buffer that is acceptable for the codec if you also ensure that all
3417 * line sizes are a multiple of the respective linesize_align[i].
3419 * May only be used if a codec with CODEC_CAP_DR1 has been opened.
3420 * If CODEC_FLAG_EMU_EDGE is not set, the dimensions must have been increased
3421 * according to avcodec_get_edge_width() before.
3423 void avcodec_align_dimensions2(AVCodecContext *s, int *width, int *height,
3424 int linesize_align[AV_NUM_DATA_POINTERS]);
3427 * Decode the audio frame of size avpkt->size from avpkt->data into frame.
3429 * Some decoders may support multiple frames in a single AVPacket. Such
3430 * decoders would then just decode the first frame and the return value would be
3431 * less than the packet size. In this case, avcodec_decode_audio4 has to be
3432 * called again with an AVPacket containing the remaining data in order to
3433 * decode the second frame, etc... Even if no frames are returned, the packet
3434 * needs to be fed to the decoder with remaining data until it is completely
3435 * consumed or an error occurs.
3437 * Some decoders (those marked with CODEC_CAP_DELAY) have a delay between input
3438 * and output. This means that for some packets they will not immediately
3439 * produce decoded output and need to be flushed at the end of decoding to get
3440 * all the decoded data. Flushing is done by calling this function with packets
3441 * with avpkt->data set to NULL and avpkt->size set to 0 until it stops
3442 * returning samples. It is safe to flush even those decoders that are not
3443 * marked with CODEC_CAP_DELAY, then no samples will be returned.
3445 * @warning The input buffer, avpkt->data must be FF_INPUT_BUFFER_PADDING_SIZE
3446 * larger than the actual read bytes because some optimized bitstream
3447 * readers read 32 or 64 bits at once and could read over the end.
3449 * @param avctx the codec context
3450 * @param[out] frame The AVFrame in which to store decoded audio samples.
3451 * The decoder will allocate a buffer for the decoded frame by
3452 * calling the AVCodecContext.get_buffer2() callback.
3453 * When AVCodecContext.refcounted_frames is set to 1, the frame is
3454 * reference counted and the returned reference belongs to the
3455 * caller. The caller must release the frame using av_frame_unref()
3456 * when the frame is no longer needed. The caller may safely write
3457 * to the frame if av_frame_is_writable() returns 1.
3458 * When AVCodecContext.refcounted_frames is set to 0, the returned
3459 * reference belongs to the decoder and is valid only until the
3460 * next call to this function or until closing or flushing the
3461 * decoder. The caller may not write to it.
3462 * @param[out] got_frame_ptr Zero if no frame could be decoded, otherwise it is
3463 * non-zero. Note that this field being set to zero
3464 * does not mean that an error has occurred. For
3465 * decoders with CODEC_CAP_DELAY set, no given decode
3466 * call is guaranteed to produce a frame.
3467 * @param[in] avpkt The input AVPacket containing the input buffer.
3468 * At least avpkt->data and avpkt->size should be set. Some
3469 * decoders might also require additional fields to be set.
3470 * @return A negative error code is returned if an error occurred during
3471 * decoding, otherwise the number of bytes consumed from the input
3472 * AVPacket is returned.
3474 int avcodec_decode_audio4(AVCodecContext *avctx, AVFrame *frame,
3475 int *got_frame_ptr, AVPacket *avpkt);
3478 * Decode the video frame of size avpkt->size from avpkt->data into picture.
3479 * Some decoders may support multiple frames in a single AVPacket, such
3480 * decoders would then just decode the first frame.
3482 * @warning The input buffer must be FF_INPUT_BUFFER_PADDING_SIZE larger than
3483 * the actual read bytes because some optimized bitstream readers read 32 or 64
3484 * bits at once and could read over the end.
3486 * @warning The end of the input buffer buf should be set to 0 to ensure that
3487 * no overreading happens for damaged MPEG streams.
3489 * @note Codecs which have the CODEC_CAP_DELAY capability set have a delay
3490 * between input and output, these need to be fed with avpkt->data=NULL,
3491 * avpkt->size=0 at the end to return the remaining frames.
3493 * @param avctx the codec context
3494 * @param[out] picture The AVFrame in which the decoded video frame will be stored.
3495 * Use av_frame_alloc() to get an AVFrame. The codec will
3496 * allocate memory for the actual bitmap by calling the
3497 * AVCodecContext.get_buffer2() callback.
3498 * When AVCodecContext.refcounted_frames is set to 1, the frame is
3499 * reference counted and the returned reference belongs to the
3500 * caller. The caller must release the frame using av_frame_unref()
3501 * when the frame is no longer needed. The caller may safely write
3502 * to the frame if av_frame_is_writable() returns 1.
3503 * When AVCodecContext.refcounted_frames is set to 0, the returned
3504 * reference belongs to the decoder and is valid only until the
3505 * next call to this function or until closing or flushing the
3506 * decoder. The caller may not write to it.
3508 * @param[in] avpkt The input AVpacket containing the input buffer.
3509 * You can create such packet with av_init_packet() and by then setting
3510 * data and size, some decoders might in addition need other fields like
3511 * flags&AV_PKT_FLAG_KEY. All decoders are designed to use the least
3513 * @param[in,out] got_picture_ptr Zero if no frame could be decompressed, otherwise, it is nonzero.
3514 * @return On error a negative value is returned, otherwise the number of bytes
3515 * used or zero if no frame could be decompressed.
3517 int avcodec_decode_video2(AVCodecContext *avctx, AVFrame *picture,
3518 int *got_picture_ptr,
3522 * Decode a subtitle message.
3523 * Return a negative value on error, otherwise return the number of bytes used.
3524 * If no subtitle could be decompressed, got_sub_ptr is zero.
3525 * Otherwise, the subtitle is stored in *sub.
3526 * Note that CODEC_CAP_DR1 is not available for subtitle codecs. This is for
3527 * simplicity, because the performance difference is expect to be negligible
3528 * and reusing a get_buffer written for video codecs would probably perform badly
3529 * due to a potentially very different allocation pattern.
3531 * @param avctx the codec context
3532 * @param[out] sub The AVSubtitle in which the decoded subtitle will be stored, must be
3533 freed with avsubtitle_free if *got_sub_ptr is set.
3534 * @param[in,out] got_sub_ptr Zero if no subtitle could be decompressed, otherwise, it is nonzero.
3535 * @param[in] avpkt The input AVPacket containing the input buffer.
3537 int avcodec_decode_subtitle2(AVCodecContext *avctx, AVSubtitle *sub,
3542 * @defgroup lavc_parsing Frame parsing
3546 enum AVPictureStructure {
3547 AV_PICTURE_STRUCTURE_UNKNOWN, //< unknown
3548 AV_PICTURE_STRUCTURE_TOP_FIELD, //< coded as top field
3549 AV_PICTURE_STRUCTURE_BOTTOM_FIELD, //< coded as bottom field
3550 AV_PICTURE_STRUCTURE_FRAME, //< coded as frame
3553 typedef struct AVCodecParserContext {
3555 struct AVCodecParser *parser;
3556 int64_t frame_offset; /* offset of the current frame */
3557 int64_t cur_offset; /* current offset
3558 (incremented by each av_parser_parse()) */
3559 int64_t next_frame_offset; /* offset of the next frame */
3561 int pict_type; /* XXX: Put it back in AVCodecContext. */
3563 * This field is used for proper frame duration computation in lavf.
3564 * It signals, how much longer the frame duration of the current frame
3565 * is compared to normal frame duration.
3567 * frame_duration = (1 + repeat_pict) * time_base
3569 * It is used by codecs like H.264 to display telecined material.
3571 int repeat_pict; /* XXX: Put it back in AVCodecContext. */
3572 int64_t pts; /* pts of the current frame */
3573 int64_t dts; /* dts of the current frame */
3578 int fetch_timestamp;
3580 #define AV_PARSER_PTS_NB 4
3581 int cur_frame_start_index;
3582 int64_t cur_frame_offset[AV_PARSER_PTS_NB];
3583 int64_t cur_frame_pts[AV_PARSER_PTS_NB];
3584 int64_t cur_frame_dts[AV_PARSER_PTS_NB];
3587 #define PARSER_FLAG_COMPLETE_FRAMES 0x0001
3588 #define PARSER_FLAG_ONCE 0x0002
3589 /// Set if the parser has a valid file offset
3590 #define PARSER_FLAG_FETCHED_OFFSET 0x0004
3592 int64_t offset; ///< byte offset from starting packet start
3593 int64_t cur_frame_end[AV_PARSER_PTS_NB];
3596 * Set by parser to 1 for key frames and 0 for non-key frames.
3597 * It is initialized to -1, so if the parser doesn't set this flag,
3598 * old-style fallback using AV_PICTURE_TYPE_I picture type as key frames
3604 * Time difference in stream time base units from the pts of this
3605 * packet to the point at which the output from the decoder has converged
3606 * independent from the availability of previous frames. That is, the
3607 * frames are virtually identical no matter if decoding started from
3608 * the very first frame or from this keyframe.
3609 * Is AV_NOPTS_VALUE if unknown.
3610 * This field is not the display duration of the current frame.
3611 * This field has no meaning if the packet does not have AV_PKT_FLAG_KEY
3614 * The purpose of this field is to allow seeking in streams that have no
3615 * keyframes in the conventional sense. It corresponds to the
3616 * recovery point SEI in H.264 and match_time_delta in NUT. It is also
3617 * essential for some types of subtitle streams to ensure that all
3618 * subtitles are correctly displayed after seeking.
3620 int64_t convergence_duration;
3622 // Timestamp generation support:
3624 * Synchronization point for start of timestamp generation.
3626 * Set to >0 for sync point, 0 for no sync point and <0 for undefined
3629 * For example, this corresponds to presence of H.264 buffering period
3635 * Offset of the current timestamp against last timestamp sync point in
3636 * units of AVCodecContext.time_base.
3638 * Set to INT_MIN when dts_sync_point unused. Otherwise, it must
3639 * contain a valid timestamp offset.
3641 * Note that the timestamp of sync point has usually a nonzero
3642 * dts_ref_dts_delta, which refers to the previous sync point. Offset of
3643 * the next frame after timestamp sync point will be usually 1.
3645 * For example, this corresponds to H.264 cpb_removal_delay.
3647 int dts_ref_dts_delta;
3650 * Presentation delay of current frame in units of AVCodecContext.time_base.
3652 * Set to INT_MIN when dts_sync_point unused. Otherwise, it must
3653 * contain valid non-negative timestamp delta (presentation time of a frame
3654 * must not lie in the past).
3656 * This delay represents the difference between decoding and presentation
3657 * time of the frame.
3659 * For example, this corresponds to H.264 dpb_output_delay.
3664 * Position of the packet in file.
3666 * Analogous to cur_frame_pts/dts
3668 int64_t cur_frame_pos[AV_PARSER_PTS_NB];
3671 * Byte position of currently parsed frame in stream.
3676 * Previous frame byte position.
3681 * Duration of the current frame.
3682 * For audio, this is in units of 1 / AVCodecContext.sample_rate.
3683 * For all other types, this is in units of AVCodecContext.time_base.
3687 enum AVFieldOrder field_order;
3690 * Indicate whether a picture is coded as a frame, top field or bottom field.
3692 * For example, H.264 field_pic_flag equal to 0 corresponds to
3693 * AV_PICTURE_STRUCTURE_FRAME. An H.264 picture with field_pic_flag
3694 * equal to 1 and bottom_field_flag equal to 0 corresponds to
3695 * AV_PICTURE_STRUCTURE_TOP_FIELD.
3697 enum AVPictureStructure picture_structure;
3700 * Picture number incremented in presentation or output order.
3701 * This field may be reinitialized at the first picture of a new sequence.
3703 * For example, this corresponds to H.264 PicOrderCnt.
3705 int output_picture_number;
3706 } AVCodecParserContext;
3708 typedef struct AVCodecParser {
3709 int codec_ids[5]; /* several codec IDs are permitted */
3711 int (*parser_init)(AVCodecParserContext *s);
3712 int (*parser_parse)(AVCodecParserContext *s,
3713 AVCodecContext *avctx,
3714 const uint8_t **poutbuf, int *poutbuf_size,
3715 const uint8_t *buf, int buf_size);
3716 void (*parser_close)(AVCodecParserContext *s);
3717 int (*split)(AVCodecContext *avctx, const uint8_t *buf, int buf_size);
3718 struct AVCodecParser *next;
3721 AVCodecParser *av_parser_next(AVCodecParser *c);
3723 void av_register_codec_parser(AVCodecParser *parser);
3724 AVCodecParserContext *av_parser_init(int codec_id);
3729 * @param s parser context.
3730 * @param avctx codec context.
3731 * @param poutbuf set to pointer to parsed buffer or NULL if not yet finished.
3732 * @param poutbuf_size set to size of parsed buffer or zero if not yet finished.
3733 * @param buf input buffer.
3734 * @param buf_size input length, to signal EOF, this should be 0 (so that the last frame can be output).
3735 * @param pts input presentation timestamp.
3736 * @param dts input decoding timestamp.
3737 * @param pos input byte position in stream.
3738 * @return the number of bytes of the input bitstream used.
3743 * len = av_parser_parse2(myparser, AVCodecContext, &data, &size,
3750 * decode_frame(data, size);
3754 int av_parser_parse2(AVCodecParserContext *s,
3755 AVCodecContext *avctx,
3756 uint8_t **poutbuf, int *poutbuf_size,
3757 const uint8_t *buf, int buf_size,
3758 int64_t pts, int64_t dts,
3762 * @return 0 if the output buffer is a subset of the input, 1 if it is allocated and must be freed
3763 * @deprecated use AVBitstreamFilter
3765 int av_parser_change(AVCodecParserContext *s,
3766 AVCodecContext *avctx,
3767 uint8_t **poutbuf, int *poutbuf_size,
3768 const uint8_t *buf, int buf_size, int keyframe);
3769 void av_parser_close(AVCodecParserContext *s);
3777 * @addtogroup lavc_encoding
3782 * Find a registered encoder with a matching codec ID.
3784 * @param id AVCodecID of the requested encoder
3785 * @return An encoder if one was found, NULL otherwise.
3787 AVCodec *avcodec_find_encoder(enum AVCodecID id);
3790 * Find a registered encoder with the specified name.
3792 * @param name name of the requested encoder
3793 * @return An encoder if one was found, NULL otherwise.
3795 AVCodec *avcodec_find_encoder_by_name(const char *name);
3798 * Encode a frame of audio.
3800 * Takes input samples from frame and writes the next output packet, if
3801 * available, to avpkt. The output packet does not necessarily contain data for
3802 * the most recent frame, as encoders can delay, split, and combine input frames
3803 * internally as needed.
3805 * @param avctx codec context
3806 * @param avpkt output AVPacket.
3807 * The user can supply an output buffer by setting
3808 * avpkt->data and avpkt->size prior to calling the
3809 * function, but if the size of the user-provided data is not
3810 * large enough, encoding will fail. All other AVPacket fields
3811 * will be reset by the encoder using av_init_packet(). If
3812 * avpkt->data is NULL, the encoder will allocate it.
3813 * The encoder will set avpkt->size to the size of the
3816 * If this function fails or produces no output, avpkt will be
3817 * freed using av_free_packet() (i.e. avpkt->destruct will be
3818 * called to free the user supplied buffer).
3819 * @param[in] frame AVFrame containing the raw audio data to be encoded.
3820 * May be NULL when flushing an encoder that has the
3821 * CODEC_CAP_DELAY capability set.
3822 * If CODEC_CAP_VARIABLE_FRAME_SIZE is set, then each frame
3823 * can have any number of samples.
3824 * If it is not set, frame->nb_samples must be equal to
3825 * avctx->frame_size for all frames except the last.
3826 * The final frame may be smaller than avctx->frame_size.
3827 * @param[out] got_packet_ptr This field is set to 1 by libavcodec if the
3828 * output packet is non-empty, and to 0 if it is
3829 * empty. If the function returns an error, the
3830 * packet can be assumed to be invalid, and the
3831 * value of got_packet_ptr is undefined and should
3833 * @return 0 on success, negative error code on failure
3835 int avcodec_encode_audio2(AVCodecContext *avctx, AVPacket *avpkt,
3836 const AVFrame *frame, int *got_packet_ptr);
3839 * Encode a frame of video.
3841 * Takes input raw video data from frame and writes the next output packet, if
3842 * available, to avpkt. The output packet does not necessarily contain data for
3843 * the most recent frame, as encoders can delay and reorder input frames
3844 * internally as needed.
3846 * @param avctx codec context
3847 * @param avpkt output AVPacket.
3848 * The user can supply an output buffer by setting
3849 * avpkt->data and avpkt->size prior to calling the
3850 * function, but if the size of the user-provided data is not
3851 * large enough, encoding will fail. All other AVPacket fields
3852 * will be reset by the encoder using av_init_packet(). If
3853 * avpkt->data is NULL, the encoder will allocate it.
3854 * The encoder will set avpkt->size to the size of the
3855 * output packet. The returned data (if any) belongs to the
3856 * caller, he is responsible for freeing it.
3858 * If this function fails or produces no output, avpkt will be
3859 * freed using av_free_packet() (i.e. avpkt->destruct will be
3860 * called to free the user supplied buffer).
3861 * @param[in] frame AVFrame containing the raw video data to be encoded.
3862 * May be NULL when flushing an encoder that has the
3863 * CODEC_CAP_DELAY capability set.
3864 * @param[out] got_packet_ptr This field is set to 1 by libavcodec if the
3865 * output packet is non-empty, and to 0 if it is
3866 * empty. If the function returns an error, the
3867 * packet can be assumed to be invalid, and the
3868 * value of got_packet_ptr is undefined and should
3870 * @return 0 on success, negative error code on failure
3872 int avcodec_encode_video2(AVCodecContext *avctx, AVPacket *avpkt,
3873 const AVFrame *frame, int *got_packet_ptr);
3875 int avcodec_encode_subtitle(AVCodecContext *avctx, uint8_t *buf, int buf_size,
3876 const AVSubtitle *sub);
3884 * @addtogroup lavc_picture
3889 * Allocate memory for a picture. Call avpicture_free() to free it.
3891 * @see avpicture_fill()
3893 * @param picture the picture to be filled in
3894 * @param pix_fmt the format of the picture
3895 * @param width the width of the picture
3896 * @param height the height of the picture
3897 * @return zero if successful, a negative value if not
3899 int avpicture_alloc(AVPicture *picture, enum AVPixelFormat pix_fmt, int width, int height);
3902 * Free a picture previously allocated by avpicture_alloc().
3903 * The data buffer used by the AVPicture is freed, but the AVPicture structure
3906 * @param picture the AVPicture to be freed
3908 void avpicture_free(AVPicture *picture);
3911 * Fill in the AVPicture fields.
3912 * The fields of the given AVPicture are filled in by using the 'ptr' address
3913 * which points to the image data buffer. Depending on the specified picture
3914 * format, one or multiple image data pointers and line sizes will be set.
3915 * If a planar format is specified, several pointers will be set pointing to
3916 * the different picture planes and the line sizes of the different planes
3917 * will be stored in the lines_sizes array.
3918 * Call with ptr == NULL to get the required size for the ptr buffer.
3920 * To allocate the buffer and fill in the AVPicture fields in one call,
3921 * use avpicture_alloc().
3923 * @param picture AVPicture whose fields are to be filled in
3924 * @param ptr Buffer which will contain or contains the actual image data
3925 * @param pix_fmt The format in which the picture data is stored.
3926 * @param width the width of the image in pixels
3927 * @param height the height of the image in pixels
3928 * @return size of the image data in bytes
3930 int avpicture_fill(AVPicture *picture, uint8_t *ptr,
3931 enum AVPixelFormat pix_fmt, int width, int height);
3934 * Copy pixel data from an AVPicture into a buffer.
3935 * The data is stored compactly, without any gaps for alignment or padding
3936 * which may be applied by avpicture_fill().
3938 * @see avpicture_get_size()
3940 * @param[in] src AVPicture containing image data
3941 * @param[in] pix_fmt The format in which the picture data is stored.
3942 * @param[in] width the width of the image in pixels.
3943 * @param[in] height the height of the image in pixels.
3944 * @param[out] dest A buffer into which picture data will be copied.
3945 * @param[in] dest_size The size of 'dest'.
3946 * @return The number of bytes written to dest, or a negative value (error code) on error.
3948 int avpicture_layout(const AVPicture* src, enum AVPixelFormat pix_fmt,
3949 int width, int height,
3950 unsigned char *dest, int dest_size);
3953 * Calculate the size in bytes that a picture of the given width and height
3954 * would occupy if stored in the given picture format.
3955 * Note that this returns the size of a compact representation as generated
3956 * by avpicture_layout(), which can be smaller than the size required for e.g.
3959 * @param pix_fmt the given picture format
3960 * @param width the width of the image
3961 * @param height the height of the image
3962 * @return Image data size in bytes or -1 on error (e.g. too large dimensions).
3964 int avpicture_get_size(enum AVPixelFormat pix_fmt, int width, int height);
3966 #if FF_API_DEINTERLACE
3968 * deinterlace - if not supported return -1
3970 * @deprecated - use yadif (in libavfilter) instead
3972 attribute_deprecated
3973 int avpicture_deinterlace(AVPicture *dst, const AVPicture *src,
3974 enum AVPixelFormat pix_fmt, int width, int height);
3977 * Copy image src to dst. Wraps av_picture_data_copy() above.
3979 void av_picture_copy(AVPicture *dst, const AVPicture *src,
3980 enum AVPixelFormat pix_fmt, int width, int height);
3983 * Crop image top and left side.
3985 int av_picture_crop(AVPicture *dst, const AVPicture *src,
3986 enum AVPixelFormat pix_fmt, int top_band, int left_band);
3991 int av_picture_pad(AVPicture *dst, const AVPicture *src, int height, int width, enum AVPixelFormat pix_fmt,
3992 int padtop, int padbottom, int padleft, int padright, int *color);
3999 * @defgroup lavc_misc Utility functions
4002 * Miscellaneous utility functions related to both encoding and decoding
4008 * @defgroup lavc_misc_pixfmt Pixel formats
4010 * Functions for working with pixel formats.
4015 * @deprecated Use av_pix_fmt_get_chroma_sub_sample
4018 void attribute_deprecated avcodec_get_chroma_sub_sample(enum AVPixelFormat pix_fmt, int *h_shift, int *v_shift);
4021 * Return a value representing the fourCC code associated to the
4022 * pixel format pix_fmt, or 0 if no associated fourCC code can be
4025 unsigned int avcodec_pix_fmt_to_codec_tag(enum AVPixelFormat pix_fmt);
4027 #define FF_LOSS_RESOLUTION 0x0001 /**< loss due to resolution change */
4028 #define FF_LOSS_DEPTH 0x0002 /**< loss due to color depth change */
4029 #define FF_LOSS_COLORSPACE 0x0004 /**< loss due to color space conversion */
4030 #define FF_LOSS_ALPHA 0x0008 /**< loss of alpha bits */
4031 #define FF_LOSS_COLORQUANT 0x0010 /**< loss due to color quantization */
4032 #define FF_LOSS_CHROMA 0x0020 /**< loss of chroma (e.g. RGB to gray conversion) */
4035 * Compute what kind of losses will occur when converting from one specific
4036 * pixel format to another.
4037 * When converting from one pixel format to another, information loss may occur.
4038 * For example, when converting from RGB24 to GRAY, the color information will
4039 * be lost. Similarly, other losses occur when converting from some formats to
4040 * other formats. These losses can involve loss of chroma, but also loss of
4041 * resolution, loss of color depth, loss due to the color space conversion, loss
4042 * of the alpha bits or loss due to color quantization.
4043 * avcodec_get_fix_fmt_loss() informs you about the various types of losses
4044 * which will occur when converting from one pixel format to another.
4046 * @param[in] dst_pix_fmt destination pixel format
4047 * @param[in] src_pix_fmt source pixel format
4048 * @param[in] has_alpha Whether the source pixel format alpha channel is used.
4049 * @return Combination of flags informing you what kind of losses will occur.
4051 int avcodec_get_pix_fmt_loss(enum AVPixelFormat dst_pix_fmt, enum AVPixelFormat src_pix_fmt,
4055 * Find the best pixel format to convert to given a certain source pixel
4056 * format. When converting from one pixel format to another, information loss
4057 * may occur. For example, when converting from RGB24 to GRAY, the color
4058 * information will be lost. Similarly, other losses occur when converting from
4059 * some formats to other formats. avcodec_find_best_pix_fmt2() searches which of
4060 * the given pixel formats should be used to suffer the least amount of loss.
4061 * The pixel formats from which it chooses one, are determined by the
4062 * pix_fmt_list parameter.
4065 * @param[in] pix_fmt_list AV_PIX_FMT_NONE terminated array of pixel formats to choose from
4066 * @param[in] src_pix_fmt source pixel format
4067 * @param[in] has_alpha Whether the source pixel format alpha channel is used.
4068 * @param[out] loss_ptr Combination of flags informing you what kind of losses will occur.
4069 * @return The best pixel format to convert to or -1 if none was found.
4071 enum AVPixelFormat avcodec_find_best_pix_fmt2(enum AVPixelFormat *pix_fmt_list,
4072 enum AVPixelFormat src_pix_fmt,
4073 int has_alpha, int *loss_ptr);
4075 enum AVPixelFormat avcodec_default_get_format(struct AVCodecContext *s, const enum AVPixelFormat * fmt);
4081 #if FF_API_SET_DIMENSIONS
4083 * @deprecated this function is not supposed to be used from outside of lavc
4085 attribute_deprecated
4086 void avcodec_set_dimensions(AVCodecContext *s, int width, int height);
4090 * Put a string representing the codec tag codec_tag in buf.
4092 * @param buf_size size in bytes of buf
4093 * @return the length of the string that would have been generated if
4094 * enough space had been available, excluding the trailing null
4096 size_t av_get_codec_tag_string(char *buf, size_t buf_size, unsigned int codec_tag);
4098 void avcodec_string(char *buf, int buf_size, AVCodecContext *enc, int encode);
4101 * Return a name for the specified profile, if available.
4103 * @param codec the codec that is searched for the given profile
4104 * @param profile the profile value for which a name is requested
4105 * @return A name for the profile if found, NULL otherwise.
4107 const char *av_get_profile_name(const AVCodec *codec, int profile);
4109 int avcodec_default_execute(AVCodecContext *c, int (*func)(AVCodecContext *c2, void *arg2),void *arg, int *ret, int count, int size);
4110 int avcodec_default_execute2(AVCodecContext *c, int (*func)(AVCodecContext *c2, void *arg2, int, int),void *arg, int *ret, int count);
4111 //FIXME func typedef
4114 * Fill audio frame data and linesize.
4115 * AVFrame extended_data channel pointers are allocated if necessary for
4118 * @param frame the AVFrame
4119 * frame->nb_samples must be set prior to calling the
4120 * function. This function fills in frame->data,
4121 * frame->extended_data, frame->linesize[0].
4122 * @param nb_channels channel count
4123 * @param sample_fmt sample format
4124 * @param buf buffer to use for frame data
4125 * @param buf_size size of buffer
4126 * @param align plane size sample alignment (0 = default)
4127 * @return 0 on success, negative error code on failure
4129 int avcodec_fill_audio_frame(AVFrame *frame, int nb_channels,
4130 enum AVSampleFormat sample_fmt, const uint8_t *buf,
4131 int buf_size, int align);
4134 * Reset the internal decoder state / flush internal buffers. Should be called
4135 * e.g. when seeking or when switching to a different stream.
4137 * @note when refcounted frames are not used (i.e. avctx->refcounted_frames is 0),
4138 * this invalidates the frames previously returned from the decoder. When
4139 * refcounted frames are used, the decoder just releases any references it might
4140 * keep internally, but the caller's reference remains valid.
4142 void avcodec_flush_buffers(AVCodecContext *avctx);
4145 * Return codec bits per sample.
4147 * @param[in] codec_id the codec
4148 * @return Number of bits per sample or zero if unknown for the given codec.
4150 int av_get_bits_per_sample(enum AVCodecID codec_id);
4153 * Return codec bits per sample.
4154 * Only return non-zero if the bits per sample is exactly correct, not an
4157 * @param[in] codec_id the codec
4158 * @return Number of bits per sample or zero if unknown for the given codec.
4160 int av_get_exact_bits_per_sample(enum AVCodecID codec_id);
4163 * Return audio frame duration.
4165 * @param avctx codec context
4166 * @param frame_bytes size of the frame, or 0 if unknown
4167 * @return frame duration, in samples, if known. 0 if not able to
4170 int av_get_audio_frame_duration(AVCodecContext *avctx, int frame_bytes);
4173 typedef struct AVBitStreamFilterContext {
4175 struct AVBitStreamFilter *filter;
4176 AVCodecParserContext *parser;
4177 struct AVBitStreamFilterContext *next;
4178 } AVBitStreamFilterContext;
4181 typedef struct AVBitStreamFilter {
4184 int (*filter)(AVBitStreamFilterContext *bsfc,
4185 AVCodecContext *avctx, const char *args,
4186 uint8_t **poutbuf, int *poutbuf_size,
4187 const uint8_t *buf, int buf_size, int keyframe);
4188 void (*close)(AVBitStreamFilterContext *bsfc);
4189 struct AVBitStreamFilter *next;
4190 } AVBitStreamFilter;
4192 void av_register_bitstream_filter(AVBitStreamFilter *bsf);
4193 AVBitStreamFilterContext *av_bitstream_filter_init(const char *name);
4194 int av_bitstream_filter_filter(AVBitStreamFilterContext *bsfc,
4195 AVCodecContext *avctx, const char *args,
4196 uint8_t **poutbuf, int *poutbuf_size,
4197 const uint8_t *buf, int buf_size, int keyframe);
4198 void av_bitstream_filter_close(AVBitStreamFilterContext *bsf);
4200 AVBitStreamFilter *av_bitstream_filter_next(AVBitStreamFilter *f);
4205 * Allocate a buffer with padding, reusing the given one if large enough.
4207 * Same behaviour av_fast_malloc but the buffer has additional
4208 * FF_INPUT_PADDING_SIZE at the end which will always memset to 0.
4211 void av_fast_padded_malloc(void *ptr, unsigned int *size, size_t min_size);
4214 * Encode extradata length to a buffer. Used by xiph codecs.
4216 * @param s buffer to write to; must be at least (v/255+1) bytes long
4217 * @param v size of extradata in bytes
4218 * @return number of bytes written to the buffer.
4220 unsigned int av_xiphlacing(unsigned char *s, unsigned int v);
4222 #if FF_API_MISSING_SAMPLE
4224 * Log a generic warning message about a missing feature. This function is
4225 * intended to be used internally by Libav (libavcodec, libavformat, etc.)
4226 * only, and would normally not be used by applications.
4227 * @param[in] avc a pointer to an arbitrary struct of which the first field is
4228 * a pointer to an AVClass struct
4229 * @param[in] feature string containing the name of the missing feature
4230 * @param[in] want_sample indicates if samples are wanted which exhibit this feature.
4231 * If want_sample is non-zero, additional verbage will be added to the log
4232 * message which tells the user how to report samples to the development
4234 * @deprecated Use avpriv_report_missing_feature() instead.
4236 attribute_deprecated
4237 void av_log_missing_feature(void *avc, const char *feature, int want_sample);
4240 * Log a generic warning message asking for a sample. This function is
4241 * intended to be used internally by Libav (libavcodec, libavformat, etc.)
4242 * only, and would normally not be used by applications.
4243 * @param[in] avc a pointer to an arbitrary struct of which the first field is
4244 * a pointer to an AVClass struct
4245 * @param[in] msg string containing an optional message, or NULL if no message
4246 * @deprecated Use avpriv_request_sample() instead.
4248 attribute_deprecated
4249 void av_log_ask_for_sample(void *avc, const char *msg, ...) av_printf_format(2, 3);
4250 #endif /* FF_API_MISSING_SAMPLE */
4253 * Register the hardware accelerator hwaccel.
4255 void av_register_hwaccel(AVHWAccel *hwaccel);
4258 * If hwaccel is NULL, returns the first registered hardware accelerator,
4259 * if hwaccel is non-NULL, returns the next registered hardware accelerator
4260 * after hwaccel, or NULL if hwaccel is the last one.
4262 AVHWAccel *av_hwaccel_next(AVHWAccel *hwaccel);
4266 * Lock operation used by lockmgr
4269 AV_LOCK_CREATE, ///< Create a mutex
4270 AV_LOCK_OBTAIN, ///< Lock the mutex
4271 AV_LOCK_RELEASE, ///< Unlock the mutex
4272 AV_LOCK_DESTROY, ///< Free mutex resources
4276 * Register a user provided lock manager supporting the operations
4277 * specified by AVLockOp. mutex points to a (void *) where the
4278 * lockmgr should store/get a pointer to a user allocated mutex. It's
4279 * NULL upon AV_LOCK_CREATE and != NULL for all other ops.
4281 * @param cb User defined callback. Note: Libav may invoke calls to this
4282 * callback during the call to av_lockmgr_register().
4283 * Thus, the application must be prepared to handle that.
4284 * If cb is set to NULL the lockmgr will be unregistered.
4285 * Also note that during unregistration the previously registered
4286 * lockmgr callback may also be invoked.
4288 int av_lockmgr_register(int (*cb)(void **mutex, enum AVLockOp op));
4291 * Get the type of the given codec.
4293 enum AVMediaType avcodec_get_type(enum AVCodecID codec_id);
4296 * @return a positive value if s is open (i.e. avcodec_open2() was called on it
4297 * with no corresponding avcodec_close()), 0 otherwise.
4299 int avcodec_is_open(AVCodecContext *s);
4302 * @return a non-zero number if codec is an encoder, zero otherwise
4304 int av_codec_is_encoder(const AVCodec *codec);
4307 * @return a non-zero number if codec is a decoder, zero otherwise
4309 int av_codec_is_decoder(const AVCodec *codec);
4312 * @return descriptor for given codec ID or NULL if no descriptor exists.
4314 const AVCodecDescriptor *avcodec_descriptor_get(enum AVCodecID id);
4317 * Iterate over all codec descriptors known to libavcodec.
4319 * @param prev previous descriptor. NULL to get the first descriptor.
4321 * @return next descriptor or NULL after the last descriptor
4323 const AVCodecDescriptor *avcodec_descriptor_next(const AVCodecDescriptor *prev);
4326 * @return codec descriptor with the given name or NULL if no such descriptor
4329 const AVCodecDescriptor *avcodec_descriptor_get_by_name(const char *name);
4335 #endif /* AVCODEC_AVCODEC_H */