2 * copyright (c) 2001 Fabrice Bellard
4 * This file is part of Libav.
6 * Libav is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
11 * Libav is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with Libav; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21 #ifndef AVCODEC_AVCODEC_H
22 #define AVCODEC_AVCODEC_H
27 * Libavcodec external API header
31 #include "libavutil/samplefmt.h"
32 #include "libavutil/attributes.h"
33 #include "libavutil/avutil.h"
34 #include "libavutil/buffer.h"
35 #include "libavutil/cpu.h"
36 #include "libavutil/dict.h"
37 #include "libavutil/frame.h"
38 #include "libavutil/log.h"
39 #include "libavutil/pixfmt.h"
40 #include "libavutil/rational.h"
44 #if FF_API_FAST_MALLOC
45 // to provide fast_*alloc
46 #include "libavutil/mem.h"
50 * @defgroup libavc Encoding/Decoding Library
53 * @defgroup lavc_decoding Decoding
57 * @defgroup lavc_encoding Encoding
61 * @defgroup lavc_codec Codecs
63 * @defgroup lavc_codec_native Native Codecs
66 * @defgroup lavc_codec_wrappers External library wrappers
69 * @defgroup lavc_codec_hwaccel Hardware Accelerators bridge
73 * @defgroup lavc_internal Internal
81 * @defgroup lavc_core Core functions/structures.
84 * Basic definitions, functions for querying libavcodec capabilities,
85 * allocating core structures, etc.
91 * Identify the syntax and semantics of the bitstream.
92 * The principle is roughly:
93 * Two decoders with the same ID can decode the same streams.
94 * Two encoders with the same ID can encode compatible streams.
95 * There may be slight deviations from the principle due to implementation
98 * If you add a codec ID to this list, add it so that
99 * 1. no value of a existing codec ID changes (that would break ABI),
100 * 2. it is as close as possible to similar codecs.
102 * After adding new codec IDs, do not forget to add an entry to the codec
103 * descriptor list and bump libavcodec minor version.
109 AV_CODEC_ID_MPEG1VIDEO,
110 AV_CODEC_ID_MPEG2VIDEO, ///< preferred ID for MPEG-1/2 video decoding
112 AV_CODEC_ID_MPEG2VIDEO_XVMC,
113 #endif /* FF_API_XVMC */
124 AV_CODEC_ID_RAWVIDEO,
125 AV_CODEC_ID_MSMPEG4V1,
126 AV_CODEC_ID_MSMPEG4V2,
127 AV_CODEC_ID_MSMPEG4V3,
150 AV_CODEC_ID_INTERPLAY_VIDEO,
157 AV_CODEC_ID_MSVIDEO1,
162 AV_CODEC_ID_TRUEMOTION1,
163 AV_CODEC_ID_VMDVIDEO,
188 AV_CODEC_ID_TRUEMOTION2,
194 AV_CODEC_ID_SMACKVIDEO,
199 AV_CODEC_ID_JPEG2000,
205 AV_CODEC_ID_DSICINVIDEO,
206 AV_CODEC_ID_TIERTEXSEQVIDEO,
214 AV_CODEC_ID_BETHSOFTVID,
226 AV_CODEC_ID_ESCAPE124,
230 AV_CODEC_ID_MOTIONPIXELS,
242 AV_CODEC_ID_FLASHSV2,
243 AV_CODEC_ID_CDGRAPHICS,
246 AV_CODEC_ID_BINKVIDEO,
247 AV_CODEC_ID_IFF_ILBM,
248 AV_CODEC_ID_IFF_BYTERUN1,
254 AV_CODEC_ID_A64_MULTI,
255 AV_CODEC_ID_A64_MULTI5,
258 AV_CODEC_ID_LAGARITH,
262 AV_CODEC_ID_WMV3IMAGE,
263 AV_CODEC_ID_VC1IMAGE,
265 AV_CODEC_ID_BMV_VIDEO,
272 AV_CODEC_ID_ZEROCODEC,
281 AV_CODEC_ID_ESCAPE130,
284 AV_CODEC_ID_HNM4_VIDEO,
287 AV_CODEC_ID_ALIAS_PIX,
288 AV_CODEC_ID_BRENDER_PIX,
289 AV_CODEC_ID_PAF_VIDEO,
297 /* various PCM "codecs" */
298 AV_CODEC_ID_FIRST_AUDIO = 0x10000, ///< A dummy id pointing at the start of audio codecs
299 AV_CODEC_ID_PCM_S16LE = 0x10000,
300 AV_CODEC_ID_PCM_S16BE,
301 AV_CODEC_ID_PCM_U16LE,
302 AV_CODEC_ID_PCM_U16BE,
305 AV_CODEC_ID_PCM_MULAW,
306 AV_CODEC_ID_PCM_ALAW,
307 AV_CODEC_ID_PCM_S32LE,
308 AV_CODEC_ID_PCM_S32BE,
309 AV_CODEC_ID_PCM_U32LE,
310 AV_CODEC_ID_PCM_U32BE,
311 AV_CODEC_ID_PCM_S24LE,
312 AV_CODEC_ID_PCM_S24BE,
313 AV_CODEC_ID_PCM_U24LE,
314 AV_CODEC_ID_PCM_U24BE,
315 AV_CODEC_ID_PCM_S24DAUD,
316 AV_CODEC_ID_PCM_ZORK,
317 AV_CODEC_ID_PCM_S16LE_PLANAR,
319 AV_CODEC_ID_PCM_F32BE,
320 AV_CODEC_ID_PCM_F32LE,
321 AV_CODEC_ID_PCM_F64BE,
322 AV_CODEC_ID_PCM_F64LE,
323 AV_CODEC_ID_PCM_BLURAY,
326 AV_CODEC_ID_PCM_S8_PLANAR,
327 AV_CODEC_ID_PCM_S24LE_PLANAR,
328 AV_CODEC_ID_PCM_S32LE_PLANAR,
330 /* various ADPCM codecs */
331 AV_CODEC_ID_ADPCM_IMA_QT = 0x11000,
332 AV_CODEC_ID_ADPCM_IMA_WAV,
333 AV_CODEC_ID_ADPCM_IMA_DK3,
334 AV_CODEC_ID_ADPCM_IMA_DK4,
335 AV_CODEC_ID_ADPCM_IMA_WS,
336 AV_CODEC_ID_ADPCM_IMA_SMJPEG,
337 AV_CODEC_ID_ADPCM_MS,
338 AV_CODEC_ID_ADPCM_4XM,
339 AV_CODEC_ID_ADPCM_XA,
340 AV_CODEC_ID_ADPCM_ADX,
341 AV_CODEC_ID_ADPCM_EA,
342 AV_CODEC_ID_ADPCM_G726,
343 AV_CODEC_ID_ADPCM_CT,
344 AV_CODEC_ID_ADPCM_SWF,
345 AV_CODEC_ID_ADPCM_YAMAHA,
346 AV_CODEC_ID_ADPCM_SBPRO_4,
347 AV_CODEC_ID_ADPCM_SBPRO_3,
348 AV_CODEC_ID_ADPCM_SBPRO_2,
349 AV_CODEC_ID_ADPCM_THP,
350 AV_CODEC_ID_ADPCM_IMA_AMV,
351 AV_CODEC_ID_ADPCM_EA_R1,
352 AV_CODEC_ID_ADPCM_EA_R3,
353 AV_CODEC_ID_ADPCM_EA_R2,
354 AV_CODEC_ID_ADPCM_IMA_EA_SEAD,
355 AV_CODEC_ID_ADPCM_IMA_EA_EACS,
356 AV_CODEC_ID_ADPCM_EA_XAS,
357 AV_CODEC_ID_ADPCM_EA_MAXIS_XA,
358 AV_CODEC_ID_ADPCM_IMA_ISS,
359 AV_CODEC_ID_ADPCM_G722,
360 AV_CODEC_ID_ADPCM_IMA_APC,
361 AV_CODEC_ID_ADPCM_VIMA,
364 AV_CODEC_ID_AMR_NB = 0x12000,
367 /* RealAudio codecs*/
368 AV_CODEC_ID_RA_144 = 0x13000,
371 /* various DPCM codecs */
372 AV_CODEC_ID_ROQ_DPCM = 0x14000,
373 AV_CODEC_ID_INTERPLAY_DPCM,
374 AV_CODEC_ID_XAN_DPCM,
375 AV_CODEC_ID_SOL_DPCM,
378 AV_CODEC_ID_MP2 = 0x15000,
379 AV_CODEC_ID_MP3, ///< preferred ID for decoding MPEG audio layer 1, 2 or 3
389 AV_CODEC_ID_VMDAUDIO,
395 AV_CODEC_ID_WESTWOOD_SND1,
396 AV_CODEC_ID_GSM, ///< as in Berlin toast format
399 AV_CODEC_ID_TRUESPEECH,
401 AV_CODEC_ID_SMACKAUDIO,
404 AV_CODEC_ID_DSICINAUDIO,
406 AV_CODEC_ID_MUSEPACK7,
408 AV_CODEC_ID_GSM_MS, /* as found in WAV */
414 AV_CODEC_ID_NELLYMOSER,
415 AV_CODEC_ID_MUSEPACK8,
417 AV_CODEC_ID_WMAVOICE,
419 AV_CODEC_ID_WMALOSSLESS,
428 AV_CODEC_ID_BINKAUDIO_RDFT,
429 AV_CODEC_ID_BINKAUDIO_DCT,
430 AV_CODEC_ID_AAC_LATM,
435 AV_CODEC_ID_8SVX_EXP,
436 AV_CODEC_ID_8SVX_FIB,
437 AV_CODEC_ID_BMV_AUDIO,
442 AV_CODEC_ID_COMFORT_NOISE,
444 AV_CODEC_ID_METASOUND,
445 AV_CODEC_ID_PAF_AUDIO,
448 /* subtitle codecs */
449 AV_CODEC_ID_FIRST_SUBTITLE = 0x17000, ///< A dummy ID pointing at the start of subtitle codecs.
450 AV_CODEC_ID_DVD_SUBTITLE = 0x17000,
451 AV_CODEC_ID_DVB_SUBTITLE,
452 AV_CODEC_ID_TEXT, ///< raw UTF-8 text
455 AV_CODEC_ID_MOV_TEXT,
456 AV_CODEC_ID_HDMV_PGS_SUBTITLE,
457 AV_CODEC_ID_DVB_TELETEXT,
460 /* other specific kind of codecs (generally used for attachments) */
461 AV_CODEC_ID_FIRST_UNKNOWN = 0x18000, ///< A dummy ID pointing at the start of various fake codecs.
462 AV_CODEC_ID_TTF = 0x18000,
464 AV_CODEC_ID_PROBE = 0x19000, ///< codec_id is not known (like AV_CODEC_ID_NONE) but lavf should attempt to identify it
466 AV_CODEC_ID_MPEG2TS = 0x20000, /**< _FAKE_ codec to indicate a raw MPEG-2 TS
467 * stream (only used by libavformat) */
468 AV_CODEC_ID_MPEG4SYSTEMS = 0x20001, /**< _FAKE_ codec to indicate a MPEG-4 Systems
469 * stream (only used by libavformat) */
470 AV_CODEC_ID_FFMETADATA = 0x21000, ///< Dummy codec for streams containing only metadata information.
474 * This struct describes the properties of a single codec described by an
476 * @see avcodec_get_descriptor()
478 typedef struct AVCodecDescriptor {
480 enum AVMediaType type;
482 * Name of the codec described by this descriptor. It is non-empty and
483 * unique for each codec descriptor. It should contain alphanumeric
484 * characters and '_' only.
488 * A more descriptive name for this codec. May be NULL.
490 const char *long_name;
492 * Codec properties, a combination of AV_CODEC_PROP_* flags.
498 * Codec uses only intra compression.
501 #define AV_CODEC_PROP_INTRA_ONLY (1 << 0)
503 * Codec supports lossy compression. Audio and video codecs only.
504 * @note a codec may support both lossy and lossless
507 #define AV_CODEC_PROP_LOSSY (1 << 1)
509 * Codec supports lossless compression. Audio and video codecs only.
511 #define AV_CODEC_PROP_LOSSLESS (1 << 2)
514 * @ingroup lavc_decoding
515 * Required number of additionally allocated bytes at the end of the input bitstream for decoding.
516 * This is mainly needed because some optimized bitstream readers read
517 * 32 or 64 bit at once and could read over the end.<br>
518 * Note: If the first 23 bits of the additional bytes are not 0, then damaged
519 * MPEG bitstreams could cause overread and segfault.
521 #define FF_INPUT_BUFFER_PADDING_SIZE 8
524 * @ingroup lavc_encoding
525 * minimum encoding buffer size
526 * Used to avoid some checks during header writing.
528 #define FF_MIN_BUFFER_SIZE 16384
532 * @ingroup lavc_encoding
533 * motion estimation type.
536 ME_ZERO = 1, ///< no search, that is use 0,0 vector whenever one is needed
540 ME_EPZS, ///< enhanced predictive zonal search
541 ME_X1, ///< reserved for experiments
542 ME_HEX, ///< hexagon based search
543 ME_UMH, ///< uneven multi-hexagon search
544 ME_TESA, ///< transformed exhaustive search algorithm
548 * @ingroup lavc_decoding
551 /* We leave some space between them for extensions (drop some
552 * keyframes for intra-only or drop just some bidir frames). */
553 AVDISCARD_NONE =-16, ///< discard nothing
554 AVDISCARD_DEFAULT = 0, ///< discard useless packets like 0 size packets in avi
555 AVDISCARD_NONREF = 8, ///< discard all non reference
556 AVDISCARD_BIDIR = 16, ///< discard all bidirectional frames
557 AVDISCARD_NONKEY = 32, ///< discard all frames except keyframes
558 AVDISCARD_ALL = 48, ///< discard all
561 enum AVColorPrimaries{
562 AVCOL_PRI_BT709 = 1, ///< also ITU-R BT1361 / IEC 61966-2-4 / SMPTE RP177 Annex B
563 AVCOL_PRI_UNSPECIFIED = 2,
564 AVCOL_PRI_BT470M = 4,
565 AVCOL_PRI_BT470BG = 5, ///< also ITU-R BT601-6 625 / ITU-R BT1358 625 / ITU-R BT1700 625 PAL & SECAM
566 AVCOL_PRI_SMPTE170M = 6, ///< also ITU-R BT601-6 525 / ITU-R BT1358 525 / ITU-R BT1700 NTSC
567 AVCOL_PRI_SMPTE240M = 7, ///< functionally identical to above
569 AVCOL_PRI_BT2020 = 9, ///< ITU-R BT2020
570 AVCOL_PRI_NB , ///< Not part of ABI
573 enum AVColorTransferCharacteristic{
574 AVCOL_TRC_BT709 = 1, ///< also ITU-R BT1361
575 AVCOL_TRC_UNSPECIFIED = 2,
576 AVCOL_TRC_GAMMA22 = 4, ///< also ITU-R BT470M / ITU-R BT1700 625 PAL & SECAM
577 AVCOL_TRC_GAMMA28 = 5, ///< also ITU-R BT470BG
578 AVCOL_TRC_SMPTE170M = 6, ///< also ITU-R BT601-6 525 or 625 / ITU-R BT1358 525 or 625 / ITU-R BT1700 NTSC
579 AVCOL_TRC_SMPTE240M = 7,
580 AVCOL_TRC_LINEAR = 8, ///< "Linear transfer characteristics"
581 AVCOL_TRC_LOG = 9, ///< "Logarithmic transfer characteristic (100:1 range)"
582 AVCOL_TRC_LOG_SQRT = 10, ///< "Logarithmic transfer characteristic (100 * Sqrt( 10 ) : 1 range)"
583 AVCOL_TRC_IEC61966_2_4 = 11, ///< IEC 61966-2-4
584 AVCOL_TRC_BT1361_ECG = 12, ///< ITU-R BT1361 Extended Colour Gamut
585 AVCOL_TRC_IEC61966_2_1 = 13, ///< IEC 61966-2-1 (sRGB or sYCC)
586 AVCOL_TRC_BT2020_10 = 14, ///< ITU-R BT2020 for 10 bit system
587 AVCOL_TRC_BT2020_12 = 15, ///< ITU-R BT2020 for 12 bit system
588 AVCOL_TRC_NB , ///< Not part of ABI
593 AVCOL_SPC_BT709 = 1, ///< also ITU-R BT1361 / IEC 61966-2-4 xvYCC709 / SMPTE RP177 Annex B
594 AVCOL_SPC_UNSPECIFIED = 2,
596 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
597 AVCOL_SPC_SMPTE170M = 6, ///< also ITU-R BT601-6 525 / ITU-R BT1358 525 / ITU-R BT1700 NTSC / functionally identical to above
598 AVCOL_SPC_SMPTE240M = 7,
599 AVCOL_SPC_YCOCG = 8, ///< Used by Dirac / VC-2 and H.264 FRext, see ITU-T SG16
600 AVCOL_SPC_BT2020_NCL = 9, ///< ITU-R BT2020 non-constant luminance system
601 AVCOL_SPC_BT2020_CL = 10, ///< ITU-R BT2020 constant luminance system
602 AVCOL_SPC_NB , ///< Not part of ABI
606 AVCOL_RANGE_UNSPECIFIED = 0,
607 AVCOL_RANGE_MPEG = 1, ///< the normal 219*2^(n-8) "MPEG" YUV ranges
608 AVCOL_RANGE_JPEG = 2, ///< the normal 2^n-1 "JPEG" YUV ranges
609 AVCOL_RANGE_NB , ///< Not part of ABI
613 * X X 3 4 X X are luma samples,
614 * 1 2 1-6 are possible chroma positions
615 * X X 5 6 X 0 is undefined/unknown position
617 enum AVChromaLocation{
618 AVCHROMA_LOC_UNSPECIFIED = 0,
619 AVCHROMA_LOC_LEFT = 1, ///< mpeg2/4, h264 default
620 AVCHROMA_LOC_CENTER = 2, ///< mpeg1, jpeg, h263
621 AVCHROMA_LOC_TOPLEFT = 3, ///< DV
622 AVCHROMA_LOC_TOP = 4,
623 AVCHROMA_LOC_BOTTOMLEFT = 5,
624 AVCHROMA_LOC_BOTTOM = 6,
625 AVCHROMA_LOC_NB , ///< Not part of ABI
628 enum AVAudioServiceType {
629 AV_AUDIO_SERVICE_TYPE_MAIN = 0,
630 AV_AUDIO_SERVICE_TYPE_EFFECTS = 1,
631 AV_AUDIO_SERVICE_TYPE_VISUALLY_IMPAIRED = 2,
632 AV_AUDIO_SERVICE_TYPE_HEARING_IMPAIRED = 3,
633 AV_AUDIO_SERVICE_TYPE_DIALOGUE = 4,
634 AV_AUDIO_SERVICE_TYPE_COMMENTARY = 5,
635 AV_AUDIO_SERVICE_TYPE_EMERGENCY = 6,
636 AV_AUDIO_SERVICE_TYPE_VOICE_OVER = 7,
637 AV_AUDIO_SERVICE_TYPE_KARAOKE = 8,
638 AV_AUDIO_SERVICE_TYPE_NB , ///< Not part of ABI
642 * @ingroup lavc_encoding
644 typedef struct RcOverride{
647 int qscale; // If this is 0 then quality_factor will be used instead.
648 float quality_factor;
651 #if FF_API_MAX_BFRAMES
653 * @deprecated there is no libavcodec-wide limit on the number of B-frames
655 #define FF_MAX_B_FRAMES 16
659 These flags can be passed in AVCodecContext.flags before initialization.
660 Note: Not everything is supported yet.
664 * Allow decoders to produce frames with data planes that are not aligned
665 * to CPU requirements (e.g. due to cropping).
667 #define CODEC_FLAG_UNALIGNED 0x0001
668 #define CODEC_FLAG_QSCALE 0x0002 ///< Use fixed qscale.
669 #define CODEC_FLAG_4MV 0x0004 ///< 4 MV per MB allowed / advanced prediction for H.263.
670 #define CODEC_FLAG_OUTPUT_CORRUPT 0x0008 ///< Output even those frames that might be corrupted
671 #define CODEC_FLAG_QPEL 0x0010 ///< Use qpel MC.
672 #define CODEC_FLAG_GMC 0x0020 ///< Use GMC.
673 #define CODEC_FLAG_MV0 0x0040 ///< Always try a MB with MV=<0,0>.
674 #if FF_API_INPUT_PRESERVED
676 * @deprecated passing reference-counted frames to the encoders replaces this
679 #define CODEC_FLAG_INPUT_PRESERVED 0x0100
681 #define CODEC_FLAG_PASS1 0x0200 ///< Use internal 2pass ratecontrol in first pass mode.
682 #define CODEC_FLAG_PASS2 0x0400 ///< Use internal 2pass ratecontrol in second pass mode.
683 #define CODEC_FLAG_GRAY 0x2000 ///< Only decode/encode grayscale.
686 * @deprecated edges are not used/required anymore. I.e. this flag is now always
689 #define CODEC_FLAG_EMU_EDGE 0x4000
691 #define CODEC_FLAG_PSNR 0x8000 ///< error[?] variables will be set during encoding.
692 #define CODEC_FLAG_TRUNCATED 0x00010000 /** Input bitstream might be truncated at a random
693 location instead of only at frame boundaries. */
694 #if FF_API_NORMALIZE_AQP
696 * @deprecated use the flag "naq" in the "mpv_flags" private option of the
699 #define CODEC_FLAG_NORMALIZE_AQP 0x00020000
701 #define CODEC_FLAG_INTERLACED_DCT 0x00040000 ///< Use interlaced DCT.
702 #define CODEC_FLAG_LOW_DELAY 0x00080000 ///< Force low delay.
703 #define CODEC_FLAG_GLOBAL_HEADER 0x00400000 ///< Place global headers in extradata instead of every keyframe.
704 #define CODEC_FLAG_BITEXACT 0x00800000 ///< Use only bitexact stuff (except (I)DCT).
705 /* Fx : Flag for h263+ extra options */
706 #define CODEC_FLAG_AC_PRED 0x01000000 ///< H.263 advanced intra coding / MPEG-4 AC prediction
707 #define CODEC_FLAG_LOOP_FILTER 0x00000800 ///< loop filter
708 #define CODEC_FLAG_INTERLACED_ME 0x20000000 ///< interlaced motion estimation
709 #define CODEC_FLAG_CLOSED_GOP 0x80000000
710 #define CODEC_FLAG2_FAST 0x00000001 ///< Allow non spec compliant speedup tricks.
711 #define CODEC_FLAG2_NO_OUTPUT 0x00000004 ///< Skip bitstream encoding.
712 #define CODEC_FLAG2_LOCAL_HEADER 0x00000008 ///< Place global headers at every keyframe instead of in extradata.
713 #define CODEC_FLAG2_IGNORE_CROP 0x00010000 ///< Discard cropping information from SPS.
715 #define CODEC_FLAG2_CHUNKS 0x00008000 ///< Input bitstream might be truncated at a packet boundaries instead of only at frame boundaries.
717 /* Unsupported options :
718 * Syntax Arithmetic coding (SAC)
719 * Reference Picture Selection
720 * Independent Segment Decoding */
722 /* codec capabilities */
724 #define CODEC_CAP_DRAW_HORIZ_BAND 0x0001 ///< Decoder can use draw_horiz_band callback.
726 * Codec uses get_buffer() for allocating buffers and supports custom allocators.
727 * If not set, it might not use get_buffer() at all or use operations that
728 * assume the buffer was allocated by avcodec_default_get_buffer.
730 #define CODEC_CAP_DR1 0x0002
731 #define CODEC_CAP_TRUNCATED 0x0008
733 /* Codec can export data for HW decoding (XvMC). */
734 #define CODEC_CAP_HWACCEL 0x0010
735 #endif /* FF_API_XVMC */
737 * Encoder or decoder requires flushing with NULL input at the end in order to
738 * give the complete and correct output.
740 * NOTE: If this flag is not set, the codec is guaranteed to never be fed with
741 * with NULL data. The user can still send NULL data to the public encode
742 * or decode function, but libavcodec will not pass it along to the codec
743 * unless this flag is set.
746 * The decoder has a non-zero delay and needs to be fed with avpkt->data=NULL,
747 * avpkt->size=0 at the end to get the delayed data until the decoder no longer
751 * The encoder needs to be fed with NULL data at the end of encoding until the
752 * encoder no longer returns data.
754 * NOTE: For encoders implementing the AVCodec.encode2() function, setting this
755 * flag also means that the encoder must set the pts and duration for
756 * each output packet. If this flag is not set, the pts and duration will
757 * be determined by libavcodec from the input frame.
759 #define CODEC_CAP_DELAY 0x0020
761 * Codec can be fed a final frame with a smaller size.
762 * This can be used to prevent truncation of the last audio samples.
764 #define CODEC_CAP_SMALL_LAST_FRAME 0x0040
767 * Codec can export data for HW decoding (VDPAU).
769 #define CODEC_CAP_HWACCEL_VDPAU 0x0080
772 * Codec can output multiple frames per AVPacket
773 * Normally demuxers return one frame at a time, demuxers which do not do
774 * are connected to a parser to split what they return into proper frames.
775 * This flag is reserved to the very rare category of codecs which have a
776 * bitstream that cannot be split into frames without timeconsuming
777 * operations like full decoding. Demuxers carring such bitstreams thus
778 * may return multiple frames in a packet. This has many disadvantages like
779 * prohibiting stream copy in many cases thus it should only be considered
782 #define CODEC_CAP_SUBFRAMES 0x0100
784 * Codec is experimental and is thus avoided in favor of non experimental
787 #define CODEC_CAP_EXPERIMENTAL 0x0200
789 * Codec should fill in channel configuration and samplerate instead of container
791 #define CODEC_CAP_CHANNEL_CONF 0x0400
792 #if FF_API_NEG_LINESIZES
794 * @deprecated no codecs use this capability
796 #define CODEC_CAP_NEG_LINESIZES 0x0800
799 * Codec supports frame-level multithreading.
801 #define CODEC_CAP_FRAME_THREADS 0x1000
803 * Codec supports slice-based (or partition-based) multithreading.
805 #define CODEC_CAP_SLICE_THREADS 0x2000
807 * Codec supports changed parameters at any point.
809 #define CODEC_CAP_PARAM_CHANGE 0x4000
811 * Codec supports avctx->thread_count == 0 (auto).
813 #define CODEC_CAP_AUTO_THREADS 0x8000
815 * Audio encoder supports receiving a different number of samples in each call.
817 #define CODEC_CAP_VARIABLE_FRAME_SIZE 0x10000
820 //The following defines may change, don't expect compatibility if you use them.
821 #define MB_TYPE_INTRA4x4 0x0001
822 #define MB_TYPE_INTRA16x16 0x0002 //FIXME H.264-specific
823 #define MB_TYPE_INTRA_PCM 0x0004 //FIXME H.264-specific
824 #define MB_TYPE_16x16 0x0008
825 #define MB_TYPE_16x8 0x0010
826 #define MB_TYPE_8x16 0x0020
827 #define MB_TYPE_8x8 0x0040
828 #define MB_TYPE_INTERLACED 0x0080
829 #define MB_TYPE_DIRECT2 0x0100 //FIXME
830 #define MB_TYPE_ACPRED 0x0200
831 #define MB_TYPE_GMC 0x0400
832 #define MB_TYPE_SKIP 0x0800
833 #define MB_TYPE_P0L0 0x1000
834 #define MB_TYPE_P1L0 0x2000
835 #define MB_TYPE_P0L1 0x4000
836 #define MB_TYPE_P1L1 0x8000
837 #define MB_TYPE_L0 (MB_TYPE_P0L0 | MB_TYPE_P1L0)
838 #define MB_TYPE_L1 (MB_TYPE_P0L1 | MB_TYPE_P1L1)
839 #define MB_TYPE_L0L1 (MB_TYPE_L0 | MB_TYPE_L1)
840 #define MB_TYPE_QUANT 0x00010000
841 #define MB_TYPE_CBP 0x00020000
842 //Note bits 24-31 are reserved for codec specific use (h264 ref0, mpeg1 0mv, ...)
847 * This specifies the area which should be displayed.
848 * Note there may be multiple such areas for one frame.
850 typedef struct AVPanScan{
853 * - encoding: Set by user.
854 * - decoding: Set by libavcodec.
859 * width and height in 1/16 pel
860 * - encoding: Set by user.
861 * - decoding: Set by libavcodec.
867 * position of the top left corner in 1/16 pel for up to 3 fields/frames
868 * - encoding: Set by user.
869 * - decoding: Set by libavcodec.
871 int16_t position[3][2];
874 #if FF_API_QSCALE_TYPE
875 #define FF_QSCALE_TYPE_MPEG1 0
876 #define FF_QSCALE_TYPE_MPEG2 1
877 #define FF_QSCALE_TYPE_H264 2
878 #define FF_QSCALE_TYPE_VP56 3
881 #if FF_API_GET_BUFFER
882 #define FF_BUFFER_TYPE_INTERNAL 1
883 #define FF_BUFFER_TYPE_USER 2 ///< direct rendering buffers (image is (de)allocated by user)
884 #define FF_BUFFER_TYPE_SHARED 4 ///< Buffer from somewhere else; don't deallocate image (data/base), all other tables are not shared.
885 #define FF_BUFFER_TYPE_COPY 8 ///< Just a (modified) copy of some other buffer, don't deallocate anything.
887 #define FF_BUFFER_HINTS_VALID 0x01 // Buffer hints value is meaningful (if 0 ignore).
888 #define FF_BUFFER_HINTS_READABLE 0x02 // Codec will read from buffer.
889 #define FF_BUFFER_HINTS_PRESERVE 0x04 // User must not alter buffer content.
890 #define FF_BUFFER_HINTS_REUSABLE 0x08 // Codec will reuse the buffer (update).
894 * The decoder will keep a reference to the frame and may reuse it later.
896 #define AV_GET_BUFFER_FLAG_REF (1 << 0)
899 * @defgroup lavc_packet AVPacket
901 * Types and functions for working with AVPacket.
904 enum AVPacketSideDataType {
906 AV_PKT_DATA_NEW_EXTRADATA,
909 * An AV_PKT_DATA_PARAM_CHANGE side data packet is laid out as follows:
912 * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_COUNT)
913 * s32le channel_count
914 * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_LAYOUT)
915 * u64le channel_layout
916 * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_SAMPLE_RATE)
918 * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_DIMENSIONS)
923 AV_PKT_DATA_PARAM_CHANGE,
926 * An AV_PKT_DATA_H263_MB_INFO side data packet contains a number of
927 * structures with info about macroblocks relevant to splitting the
928 * packet into smaller packets on macroblock edges (e.g. as for RFC 2190).
929 * That is, it does not necessarily contain info about all macroblocks,
930 * as long as the distance between macroblocks in the info is smaller
931 * than the target payload size.
932 * Each MB info structure is 12 bytes, and is laid out as follows:
934 * u32le bit offset from the start of the packet
935 * u8 current quantizer at the start of the macroblock
937 * u16le macroblock address within the GOB
938 * u8 horizontal MV predictor
939 * u8 vertical MV predictor
940 * u8 horizontal MV predictor for block number 3
941 * u8 vertical MV predictor for block number 3
944 AV_PKT_DATA_H263_MB_INFO,
947 * This side data should be associated with an audio stream and contains
948 * ReplayGain information in form of the AVReplayGain struct.
950 AV_PKT_DATA_REPLAYGAIN,
953 typedef struct AVPacketSideData {
956 enum AVPacketSideDataType type;
960 * This structure stores compressed data. It is typically exported by demuxers
961 * and then passed as input to decoders, or received as output from encoders and
962 * then passed to muxers.
964 * For video, it should typically contain one compressed frame. For audio it may
965 * contain several compressed frames.
967 * AVPacket is one of the few structs in Libav, whose size is a part of public
968 * ABI. Thus it may be allocated on stack and no new fields can be added to it
969 * without libavcodec and libavformat major bump.
971 * The semantics of data ownership depends on the buf or destruct (deprecated)
972 * fields. If either is set, the packet data is dynamically allocated and is
973 * valid indefinitely until av_free_packet() is called (which in turn calls
974 * av_buffer_unref()/the destruct callback to free the data). If neither is set,
975 * the packet data is typically backed by some static buffer somewhere and is
976 * only valid for a limited time (e.g. until the next read call when demuxing).
978 * The side data is always allocated with av_malloc() and is freed in
981 typedef struct AVPacket {
983 * A reference to the reference-counted buffer where the packet data is
985 * May be NULL, then the packet data is not reference-counted.
989 * Presentation timestamp in AVStream->time_base units; the time at which
990 * the decompressed packet will be presented to the user.
991 * Can be AV_NOPTS_VALUE if it is not stored in the file.
992 * pts MUST be larger or equal to dts as presentation cannot happen before
993 * decompression, unless one wants to view hex dumps. Some formats misuse
994 * the terms dts and pts/cts to mean something different. Such timestamps
995 * must be converted to true pts/dts before they are stored in AVPacket.
999 * Decompression timestamp in AVStream->time_base units; the time at which
1000 * the packet is decompressed.
1001 * Can be AV_NOPTS_VALUE if it is not stored in the file.
1008 * A combination of AV_PKT_FLAG values
1012 * Additional packet data that can be provided by the container.
1013 * Packet can contain several types of side information.
1015 AVPacketSideData *side_data;
1016 int side_data_elems;
1019 * Duration of this packet in AVStream->time_base units, 0 if unknown.
1020 * Equals next_pts - this_pts in presentation order.
1023 #if FF_API_DESTRUCT_PACKET
1024 attribute_deprecated
1025 void (*destruct)(struct AVPacket *);
1026 attribute_deprecated
1029 int64_t pos; ///< byte position in stream, -1 if unknown
1032 * Time difference in AVStream->time_base units from the pts of this
1033 * packet to the point at which the output from the decoder has converged
1034 * independent from the availability of previous frames. That is, the
1035 * frames are virtually identical no matter if decoding started from
1036 * the very first frame or from this keyframe.
1037 * Is AV_NOPTS_VALUE if unknown.
1038 * This field is not the display duration of the current packet.
1039 * This field has no meaning if the packet does not have AV_PKT_FLAG_KEY
1042 * The purpose of this field is to allow seeking in streams that have no
1043 * keyframes in the conventional sense. It corresponds to the
1044 * recovery point SEI in H.264 and match_time_delta in NUT. It is also
1045 * essential for some types of subtitle streams to ensure that all
1046 * subtitles are correctly displayed after seeking.
1048 int64_t convergence_duration;
1050 #define AV_PKT_FLAG_KEY 0x0001 ///< The packet contains a keyframe
1051 #define AV_PKT_FLAG_CORRUPT 0x0002 ///< The packet content is corrupted
1053 enum AVSideDataParamChangeFlags {
1054 AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_COUNT = 0x0001,
1055 AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_LAYOUT = 0x0002,
1056 AV_SIDE_DATA_PARAM_CHANGE_SAMPLE_RATE = 0x0004,
1057 AV_SIDE_DATA_PARAM_CHANGE_DIMENSIONS = 0x0008,
1063 struct AVCodecInternal;
1067 AV_FIELD_PROGRESSIVE,
1068 AV_FIELD_TT, //< Top coded_first, top displayed first
1069 AV_FIELD_BB, //< Bottom coded first, bottom displayed first
1070 AV_FIELD_TB, //< Top coded first, bottom displayed first
1071 AV_FIELD_BT, //< Bottom coded first, top displayed first
1075 * main external API structure.
1076 * New fields can be added to the end with minor version bumps.
1077 * Removal, reordering and changes to existing fields require a major
1079 * sizeof(AVCodecContext) must not be used outside libav*.
1081 typedef struct AVCodecContext {
1083 * information on struct for av_log
1084 * - set by avcodec_alloc_context3
1086 const AVClass *av_class;
1087 int log_level_offset;
1089 enum AVMediaType codec_type; /* see AVMEDIA_TYPE_xxx */
1090 const struct AVCodec *codec;
1091 char codec_name[32];
1092 enum AVCodecID codec_id; /* see AV_CODEC_ID_xxx */
1095 * fourcc (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A').
1096 * This is used to work around some encoder bugs.
1097 * A demuxer should set this to what is stored in the field used to identify the codec.
1098 * If there are multiple such fields in a container then the demuxer should choose the one
1099 * which maximizes the information about the used codec.
1100 * If the codec tag field in a container is larger than 32 bits then the demuxer should
1101 * remap the longer ID to 32 bits with a table or other structure. Alternatively a new
1102 * extra_codec_tag + size could be added but for this a clear advantage must be demonstrated
1104 * - encoding: Set by user, if not then the default based on codec_id will be used.
1105 * - decoding: Set by user, will be converted to uppercase by libavcodec during init.
1107 unsigned int codec_tag;
1110 * fourcc from the AVI stream header (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A').
1111 * This is used to work around some encoder bugs.
1112 * - encoding: unused
1113 * - decoding: Set by user, will be converted to uppercase by libavcodec during init.
1115 unsigned int stream_codec_tag;
1120 * Private context used for internal data.
1122 * Unlike priv_data, this is not codec-specific. It is used in general
1123 * libavcodec functions.
1125 struct AVCodecInternal *internal;
1128 * Private data of the user, can be used to carry app specific stuff.
1129 * - encoding: Set by user.
1130 * - decoding: Set by user.
1135 * the average bitrate
1136 * - encoding: Set by user; unused for constant quantizer encoding.
1137 * - decoding: Set by libavcodec. 0 or some bitrate if this info is available in the stream.
1142 * number of bits the bitstream is allowed to diverge from the reference.
1143 * the reference can be CBR (for CBR pass1) or VBR (for pass2)
1144 * - encoding: Set by user; unused for constant quantizer encoding.
1145 * - decoding: unused
1147 int bit_rate_tolerance;
1150 * Global quality for codecs which cannot change it per frame.
1151 * This should be proportional to MPEG-1/2/4 qscale.
1152 * - encoding: Set by user.
1153 * - decoding: unused
1158 * - encoding: Set by user.
1159 * - decoding: unused
1161 int compression_level;
1162 #define FF_COMPRESSION_DEFAULT -1
1166 * - encoding: Set by user.
1167 * - decoding: Set by user.
1173 * - encoding: Set by user.
1174 * - decoding: Set by user.
1179 * some codecs need / can use extradata like Huffman tables.
1180 * mjpeg: Huffman tables
1181 * rv10: additional flags
1182 * mpeg4: global headers (they can be in the bitstream or here)
1183 * The allocated memory should be FF_INPUT_BUFFER_PADDING_SIZE bytes larger
1184 * than extradata_size to avoid prolems if it is read with the bitstream reader.
1185 * The bytewise contents of extradata must not depend on the architecture or CPU endianness.
1186 * - encoding: Set/allocated/freed by libavcodec.
1187 * - decoding: Set/allocated/freed by user.
1193 * This is the fundamental unit of time (in seconds) in terms
1194 * of which frame timestamps are represented. For fixed-fps content,
1195 * timebase should be 1/framerate and timestamp increments should be
1197 * - encoding: MUST be set by user.
1198 * - decoding: Set by libavcodec.
1200 AVRational time_base;
1203 * For some codecs, the time base is closer to the field rate than the frame rate.
1204 * Most notably, H.264 and MPEG-2 specify time_base as half of frame duration
1205 * if no telecine is used ...
1207 * Set to time_base ticks per frame. Default 1, e.g., H.264/MPEG-2 set it to 2.
1209 int ticks_per_frame;
1215 * Number of frames the decoded output will be delayed relative to the
1219 * For encoding, this is the number of "priming" samples added by the
1220 * encoder to the beginning of the stream. The decoded output will be
1221 * delayed by this many samples relative to the input to the encoder (or
1222 * more, if the decoder adds its own padding).
1223 * The timestamps on the output packets are adjusted by the encoder so
1224 * that they always refer to the first sample of the data actually
1225 * contained in the packet, including any added padding.
1226 * E.g. if the timebase is 1/samplerate and the timestamp of the first
1227 * input sample is 0, the timestamp of the first output packet will be
1230 * For decoding, this is the number of samples the decoder needs to
1231 * output before the decoder's output is valid. When seeking, you should
1232 * start decoding this many samples prior to your desired seek point.
1234 * - encoding: Set by libavcodec.
1235 * - decoding: Set by libavcodec.
1242 * picture width / height.
1243 * - encoding: MUST be set by user.
1244 * - decoding: May be set by the user before opening the decoder if known e.g.
1245 * from the container. Some decoders will require the dimensions
1246 * to be set by the caller. During decoding, the decoder may
1247 * overwrite those values as required.
1252 * Bitstream width / height, may be different from width/height e.g. when
1253 * the decoded frame is cropped before being output.
1254 * - encoding: unused
1255 * - decoding: May be set by the user before opening the decoder if known
1256 * e.g. from the container. During decoding, the decoder may
1257 * overwrite those values as required.
1259 int coded_width, coded_height;
1261 #if FF_API_ASPECT_EXTENDED
1262 #define FF_ASPECT_EXTENDED 15
1266 * the number of pictures in a group of pictures, or 0 for intra_only
1267 * - encoding: Set by user.
1268 * - decoding: unused
1273 * Pixel format, see AV_PIX_FMT_xxx.
1274 * May be set by the demuxer if known from headers.
1275 * May be overriden by the decoder if it knows better.
1276 * - encoding: Set by user.
1277 * - decoding: Set by user if known, overridden by libavcodec if known
1279 enum AVPixelFormat pix_fmt;
1282 * Motion estimation algorithm used for video coding.
1283 * 1 (zero), 2 (full), 3 (log), 4 (phods), 5 (epzs), 6 (x1), 7 (hex),
1284 * 8 (umh), 10 (tesa) [7, 8, 10 are x264 specific]
1285 * - encoding: MUST be set by user.
1286 * - decoding: unused
1291 * If non NULL, 'draw_horiz_band' is called by the libavcodec
1292 * decoder to draw a horizontal band. It improves cache usage. Not
1293 * all codecs can do that. You must check the codec capabilities
1295 * When multithreading is used, it may be called from multiple threads
1296 * at the same time; threads might draw different parts of the same AVFrame,
1297 * or multiple AVFrames, and there is no guarantee that slices will be drawn
1299 * The function is also used by hardware acceleration APIs.
1300 * It is called at least once during frame decoding to pass
1301 * the data needed for hardware render.
1302 * In that mode instead of pixel data, AVFrame points to
1303 * a structure specific to the acceleration API. The application
1304 * reads the structure and can change some fields to indicate progress
1306 * - encoding: unused
1307 * - decoding: Set by user.
1308 * @param height the height of the slice
1309 * @param y the y position of the slice
1310 * @param type 1->top field, 2->bottom field, 3->frame
1311 * @param offset offset into the AVFrame.data from which the slice should be read
1313 void (*draw_horiz_band)(struct AVCodecContext *s,
1314 const AVFrame *src, int offset[AV_NUM_DATA_POINTERS],
1315 int y, int type, int height);
1318 * callback to negotiate the pixelFormat
1319 * @param fmt is the list of formats which are supported by the codec,
1320 * it is terminated by -1 as 0 is a valid format, the formats are ordered by quality.
1321 * The first is always the native one.
1322 * @return the chosen format
1323 * - encoding: unused
1324 * - decoding: Set by user, if not set the native format will be chosen.
1326 enum AVPixelFormat (*get_format)(struct AVCodecContext *s, const enum AVPixelFormat * fmt);
1329 * maximum number of B-frames between non-B-frames
1330 * Note: The output will be delayed by max_b_frames+1 relative to the input.
1331 * - encoding: Set by user.
1332 * - decoding: unused
1337 * qscale factor between IP and B-frames
1338 * If > 0 then the last P-frame quantizer will be used (q= lastp_q*factor+offset).
1339 * If < 0 then normal ratecontrol will be done (q= -normal_q*factor+offset).
1340 * - encoding: Set by user.
1341 * - decoding: unused
1343 float b_quant_factor;
1345 /** obsolete FIXME remove */
1347 #define FF_RC_STRATEGY_XVID 1
1349 int b_frame_strategy;
1352 * qscale offset between IP and B-frames
1353 * - encoding: Set by user.
1354 * - decoding: unused
1356 float b_quant_offset;
1359 * Size of the frame reordering buffer in the decoder.
1360 * For MPEG-2 it is 1 IPB or 0 low delay IP.
1361 * - encoding: Set by libavcodec.
1362 * - decoding: Set by libavcodec.
1367 * 0-> h263 quant 1-> mpeg quant
1368 * - encoding: Set by user.
1369 * - decoding: unused
1374 * qscale factor between P and I-frames
1375 * If > 0 then the last p frame quantizer will be used (q= lastp_q*factor+offset).
1376 * If < 0 then normal ratecontrol will be done (q= -normal_q*factor+offset).
1377 * - encoding: Set by user.
1378 * - decoding: unused
1380 float i_quant_factor;
1383 * qscale offset between P and I-frames
1384 * - encoding: Set by user.
1385 * - decoding: unused
1387 float i_quant_offset;
1390 * luminance masking (0-> disabled)
1391 * - encoding: Set by user.
1392 * - decoding: unused
1397 * temporary complexity masking (0-> disabled)
1398 * - encoding: Set by user.
1399 * - decoding: unused
1401 float temporal_cplx_masking;
1404 * spatial complexity masking (0-> disabled)
1405 * - encoding: Set by user.
1406 * - decoding: unused
1408 float spatial_cplx_masking;
1411 * p block masking (0-> disabled)
1412 * - encoding: Set by user.
1413 * - decoding: unused
1418 * darkness masking (0-> disabled)
1419 * - encoding: Set by user.
1420 * - decoding: unused
1426 * - encoding: Set by libavcodec.
1427 * - decoding: Set by user (or 0).
1431 * prediction method (needed for huffyuv)
1432 * - encoding: Set by user.
1433 * - decoding: unused
1435 int prediction_method;
1436 #define FF_PRED_LEFT 0
1437 #define FF_PRED_PLANE 1
1438 #define FF_PRED_MEDIAN 2
1441 * slice offsets in the frame in bytes
1442 * - encoding: Set/allocated by libavcodec.
1443 * - decoding: Set/allocated by user (or NULL).
1448 * sample aspect ratio (0 if unknown)
1449 * That is the width of a pixel divided by the height of the pixel.
1450 * Numerator and denominator must be relatively prime and smaller than 256 for some video standards.
1451 * - encoding: Set by user.
1452 * - decoding: Set by libavcodec.
1454 AVRational sample_aspect_ratio;
1457 * motion estimation comparison function
1458 * - encoding: Set by user.
1459 * - decoding: unused
1463 * subpixel motion estimation comparison function
1464 * - encoding: Set by user.
1465 * - decoding: unused
1469 * macroblock comparison function (not supported yet)
1470 * - encoding: Set by user.
1471 * - decoding: unused
1475 * interlaced DCT comparison function
1476 * - encoding: Set by user.
1477 * - decoding: unused
1480 #define FF_CMP_SAD 0
1481 #define FF_CMP_SSE 1
1482 #define FF_CMP_SATD 2
1483 #define FF_CMP_DCT 3
1484 #define FF_CMP_PSNR 4
1485 #define FF_CMP_BIT 5
1487 #define FF_CMP_ZERO 7
1488 #define FF_CMP_VSAD 8
1489 #define FF_CMP_VSSE 9
1490 #define FF_CMP_NSSE 10
1491 #define FF_CMP_DCTMAX 13
1492 #define FF_CMP_DCT264 14
1493 #define FF_CMP_CHROMA 256
1496 * ME diamond size & shape
1497 * - encoding: Set by user.
1498 * - decoding: unused
1503 * amount of previous MV predictors (2a+1 x 2a+1 square)
1504 * - encoding: Set by user.
1505 * - decoding: unused
1507 int last_predictor_count;
1510 * prepass for motion estimation
1511 * - encoding: Set by user.
1512 * - decoding: unused
1517 * motion estimation prepass comparison function
1518 * - encoding: Set by user.
1519 * - decoding: unused
1524 * ME prepass diamond size & shape
1525 * - encoding: Set by user.
1526 * - decoding: unused
1532 * - encoding: Set by user.
1533 * - decoding: unused
1535 int me_subpel_quality;
1538 * DTG active format information (additional aspect ratio
1539 * information only used in DVB MPEG-2 transport streams)
1542 * - encoding: unused
1543 * - decoding: Set by decoder.
1545 int dtg_active_format;
1546 #define FF_DTG_AFD_SAME 8
1547 #define FF_DTG_AFD_4_3 9
1548 #define FF_DTG_AFD_16_9 10
1549 #define FF_DTG_AFD_14_9 11
1550 #define FF_DTG_AFD_4_3_SP_14_9 13
1551 #define FF_DTG_AFD_16_9_SP_14_9 14
1552 #define FF_DTG_AFD_SP_4_3 15
1555 * maximum motion estimation search range in subpel units
1556 * If 0 then no limit.
1558 * - encoding: Set by user.
1559 * - decoding: unused
1564 * intra quantizer bias
1565 * - encoding: Set by user.
1566 * - decoding: unused
1568 int intra_quant_bias;
1569 #define FF_DEFAULT_QUANT_BIAS 999999
1572 * inter quantizer bias
1573 * - encoding: Set by user.
1574 * - decoding: unused
1576 int inter_quant_bias;
1580 * - encoding: unused
1581 * - decoding: Set by user.
1584 #define SLICE_FLAG_CODED_ORDER 0x0001 ///< draw_horiz_band() is called in coded order instead of display
1585 #define SLICE_FLAG_ALLOW_FIELD 0x0002 ///< allow draw_horiz_band() with field slices (MPEG2 field pics)
1586 #define SLICE_FLAG_ALLOW_PLANE 0x0004 ///< allow draw_horiz_band() with 1 component at a time (SVQ1)
1590 * XVideo Motion Acceleration
1591 * - encoding: forbidden
1592 * - decoding: set by decoder
1593 * @deprecated XvMC support is slated for removal.
1595 attribute_deprecated int xvmc_acceleration;
1596 #endif /* FF_API_XVMC */
1599 * macroblock decision mode
1600 * - encoding: Set by user.
1601 * - decoding: unused
1604 #define FF_MB_DECISION_SIMPLE 0 ///< uses mb_cmp
1605 #define FF_MB_DECISION_BITS 1 ///< chooses the one which needs the fewest bits
1606 #define FF_MB_DECISION_RD 2 ///< rate distortion
1609 * custom intra quantization matrix
1610 * - encoding: Set by user, can be NULL.
1611 * - decoding: Set by libavcodec.
1613 uint16_t *intra_matrix;
1616 * custom inter quantization matrix
1617 * - encoding: Set by user, can be NULL.
1618 * - decoding: Set by libavcodec.
1620 uint16_t *inter_matrix;
1623 * scene change detection threshold
1624 * 0 is default, larger means fewer detected scene changes.
1625 * - encoding: Set by user.
1626 * - decoding: unused
1628 int scenechange_threshold;
1631 * noise reduction strength
1632 * - encoding: Set by user.
1633 * - decoding: unused
1635 int noise_reduction;
1638 * Motion estimation threshold below which no motion estimation is
1639 * performed, but instead the user specified motion vectors are used.
1641 * - encoding: Set by user.
1642 * - decoding: unused
1647 * Macroblock threshold below which the user specified macroblock types will be used.
1648 * - encoding: Set by user.
1649 * - decoding: unused
1654 * precision of the intra DC coefficient - 8
1655 * - encoding: Set by user.
1656 * - decoding: unused
1658 int intra_dc_precision;
1661 * Number of macroblock rows at the top which are skipped.
1662 * - encoding: unused
1663 * - decoding: Set by user.
1668 * Number of macroblock rows at the bottom which are skipped.
1669 * - encoding: unused
1670 * - decoding: Set by user.
1675 * Border processing masking, raises the quantizer for mbs on the borders
1677 * - encoding: Set by user.
1678 * - decoding: unused
1680 float border_masking;
1683 * minimum MB lagrange multipler
1684 * - encoding: Set by user.
1685 * - decoding: unused
1690 * maximum MB lagrange multipler
1691 * - encoding: Set by user.
1692 * - decoding: unused
1698 * - encoding: Set by user.
1699 * - decoding: unused
1701 int me_penalty_compensation;
1705 * - encoding: Set by user.
1706 * - decoding: unused
1712 * - encoding: Set by user.
1713 * - decoding: unused
1719 * - encoding: Set by user.
1720 * - decoding: unused
1725 * number of reference frames
1726 * - encoding: Set by user.
1727 * - decoding: Set by lavc.
1732 * chroma qp offset from luma
1733 * - encoding: Set by user.
1734 * - decoding: unused
1739 * Multiplied by qscale for each frame and added to scene_change_score.
1740 * - encoding: Set by user.
1741 * - decoding: unused
1743 int scenechange_factor;
1747 * Note: Value depends upon the compare function used for fullpel ME.
1748 * - encoding: Set by user.
1749 * - decoding: unused
1754 * Adjust sensitivity of b_frame_strategy 1.
1755 * - encoding: Set by user.
1756 * - decoding: unused
1761 * Chromaticity coordinates of the source primaries.
1762 * - encoding: Set by user
1763 * - decoding: Set by libavcodec
1765 enum AVColorPrimaries color_primaries;
1768 * Color Transfer Characteristic.
1769 * - encoding: Set by user
1770 * - decoding: Set by libavcodec
1772 enum AVColorTransferCharacteristic color_trc;
1775 * YUV colorspace type.
1776 * - encoding: Set by user
1777 * - decoding: Set by libavcodec
1779 enum AVColorSpace colorspace;
1782 * MPEG vs JPEG YUV range.
1783 * - encoding: Set by user
1784 * - decoding: Set by libavcodec
1786 enum AVColorRange color_range;
1789 * This defines the location of chroma samples.
1790 * - encoding: Set by user
1791 * - decoding: Set by libavcodec
1793 enum AVChromaLocation chroma_sample_location;
1797 * Indicates number of picture subdivisions. Used for parallelized
1799 * - encoding: Set by user
1800 * - decoding: unused
1805 * - encoding: set by libavcodec
1806 * - decoding: Set by libavcodec
1808 enum AVFieldOrder field_order;
1811 int sample_rate; ///< samples per second
1812 int channels; ///< number of audio channels
1815 * audio sample format
1816 * - encoding: Set by user.
1817 * - decoding: Set by libavcodec.
1819 enum AVSampleFormat sample_fmt; ///< sample format
1821 /* The following data should not be initialized. */
1823 * Number of samples per channel in an audio frame.
1825 * - encoding: set by libavcodec in avcodec_open2(). Each submitted frame
1826 * except the last must contain exactly frame_size samples per channel.
1827 * May be 0 when the codec has CODEC_CAP_VARIABLE_FRAME_SIZE set, then the
1828 * frame size is not restricted.
1829 * - decoding: may be set by some decoders to indicate constant frame size
1834 * Frame counter, set by libavcodec.
1836 * - decoding: total number of frames returned from the decoder so far.
1837 * - encoding: total number of frames passed to the encoder so far.
1839 * @note the counter is not incremented if encoding/decoding resulted in
1845 * number of bytes per packet if constant and known or 0
1846 * Used by some WAV based audio codecs.
1851 * Audio cutoff bandwidth (0 means "automatic")
1852 * - encoding: Set by user.
1853 * - decoding: unused
1857 #if FF_API_REQUEST_CHANNELS
1859 * Decoder should decode to this many channels if it can (0 for default)
1860 * - encoding: unused
1861 * - decoding: Set by user.
1862 * @deprecated Deprecated in favor of request_channel_layout.
1864 attribute_deprecated int request_channels;
1868 * Audio channel layout.
1869 * - encoding: set by user.
1870 * - decoding: set by libavcodec.
1872 uint64_t channel_layout;
1875 * Request decoder to use this channel layout if it can (0 for default)
1876 * - encoding: unused
1877 * - decoding: Set by user.
1879 uint64_t request_channel_layout;
1882 * Type of service that the audio stream conveys.
1883 * - encoding: Set by user.
1884 * - decoding: Set by libavcodec.
1886 enum AVAudioServiceType audio_service_type;
1889 * Used to request a sample format from the decoder.
1890 * - encoding: unused.
1891 * - decoding: Set by user.
1893 enum AVSampleFormat request_sample_fmt;
1895 #if FF_API_GET_BUFFER
1897 * Called at the beginning of each frame to get a buffer for it.
1899 * The function will set AVFrame.data[], AVFrame.linesize[].
1900 * AVFrame.extended_data[] must also be set, but it should be the same as
1901 * AVFrame.data[] except for planar audio with more channels than can fit
1902 * in AVFrame.data[]. In that case, AVFrame.data[] shall still contain as
1903 * many data pointers as it can hold.
1905 * if CODEC_CAP_DR1 is not set then get_buffer() must call
1906 * avcodec_default_get_buffer() instead of providing buffers allocated by
1909 * AVFrame.data[] should be 32- or 16-byte-aligned unless the CPU doesn't
1910 * need it. avcodec_default_get_buffer() aligns the output buffer properly,
1911 * but if get_buffer() is overridden then alignment considerations should
1912 * be taken into account.
1914 * @see avcodec_default_get_buffer()
1918 * If pic.reference is set then the frame will be read later by libavcodec.
1919 * avcodec_align_dimensions2() should be used to find the required width and
1920 * height, as they normally need to be rounded up to the next multiple of 16.
1922 * If frame multithreading is used and thread_safe_callbacks is set,
1923 * it may be called from a different thread, but not from more than one at
1924 * once. Does not need to be reentrant.
1926 * @see release_buffer(), reget_buffer()
1927 * @see avcodec_align_dimensions2()
1931 * Decoders request a buffer of a particular size by setting
1932 * AVFrame.nb_samples prior to calling get_buffer(). The decoder may,
1933 * however, utilize only part of the buffer by setting AVFrame.nb_samples
1934 * to a smaller value in the output frame.
1936 * Decoders cannot use the buffer after returning from
1937 * avcodec_decode_audio4(), so they will not call release_buffer(), as it
1938 * is assumed to be released immediately upon return. In some rare cases,
1939 * a decoder may need to call get_buffer() more than once in a single
1940 * call to avcodec_decode_audio4(). In that case, when get_buffer() is
1941 * called again after it has already been called once, the previously
1942 * acquired buffer is assumed to be released at that time and may not be
1943 * reused by the decoder.
1945 * As a convenience, av_samples_get_buffer_size() and
1946 * av_samples_fill_arrays() in libavutil may be used by custom get_buffer()
1947 * functions to find the required data size and to fill data pointers and
1948 * linesize. In AVFrame.linesize, only linesize[0] may be set for audio
1949 * since all planes must be the same size.
1951 * @see av_samples_get_buffer_size(), av_samples_fill_arrays()
1953 * - encoding: unused
1954 * - decoding: Set by libavcodec, user can override.
1956 * @deprecated use get_buffer2()
1958 attribute_deprecated
1959 int (*get_buffer)(struct AVCodecContext *c, AVFrame *pic);
1962 * Called to release buffers which were allocated with get_buffer.
1963 * A released buffer can be reused in get_buffer().
1964 * pic.data[*] must be set to NULL.
1965 * May be called from a different thread if frame multithreading is used,
1966 * but not by more than one thread at once, so does not need to be reentrant.
1967 * - encoding: unused
1968 * - decoding: Set by libavcodec, user can override.
1970 * @deprecated custom freeing callbacks should be set from get_buffer2()
1972 attribute_deprecated
1973 void (*release_buffer)(struct AVCodecContext *c, AVFrame *pic);
1976 * Called at the beginning of a frame to get cr buffer for it.
1977 * Buffer type (size, hints) must be the same. libavcodec won't check it.
1978 * libavcodec will pass previous buffer in pic, function should return
1979 * same buffer or new buffer with old frame "painted" into it.
1980 * If pic.data[0] == NULL must behave like get_buffer().
1981 * if CODEC_CAP_DR1 is not set then reget_buffer() must call
1982 * avcodec_default_reget_buffer() instead of providing buffers allocated by
1984 * - encoding: unused
1985 * - decoding: Set by libavcodec, user can override.
1987 attribute_deprecated
1988 int (*reget_buffer)(struct AVCodecContext *c, AVFrame *pic);
1992 * This callback is called at the beginning of each frame to get data
1993 * buffer(s) for it. There may be one contiguous buffer for all the data or
1994 * there may be a buffer per each data plane or anything in between. What
1995 * this means is, you may set however many entries in buf[] you feel necessary.
1996 * Each buffer must be reference-counted using the AVBuffer API (see description
1999 * The following fields will be set in the frame before this callback is
2002 * - width, height (video only)
2003 * - sample_rate, channel_layout, nb_samples (audio only)
2004 * Their values may differ from the corresponding values in
2005 * AVCodecContext. This callback must use the frame values, not the codec
2006 * context values, to calculate the required buffer size.
2008 * This callback must fill the following fields in the frame:
2012 * * if the data is planar audio with more than 8 channels, then this
2013 * callback must allocate and fill extended_data to contain all pointers
2014 * to all data planes. data[] must hold as many pointers as it can.
2015 * extended_data must be allocated with av_malloc() and will be freed in
2017 * * otherwise exended_data must point to data
2018 * - buf[] must contain one or more pointers to AVBufferRef structures. Each of
2019 * the frame's data and extended_data pointers must be contained in these. That
2020 * is, one AVBufferRef for each allocated chunk of memory, not necessarily one
2021 * AVBufferRef per data[] entry. See: av_buffer_create(), av_buffer_alloc(),
2022 * and av_buffer_ref().
2023 * - extended_buf and nb_extended_buf must be allocated with av_malloc() by
2024 * this callback and filled with the extra buffers if there are more
2025 * buffers than buf[] can hold. extended_buf will be freed in
2028 * If CODEC_CAP_DR1 is not set then get_buffer2() must call
2029 * avcodec_default_get_buffer2() instead of providing buffers allocated by
2032 * Each data plane must be aligned to the maximum required by the target
2035 * @see avcodec_default_get_buffer2()
2039 * If AV_GET_BUFFER_FLAG_REF is set in flags then the frame may be reused
2040 * (read and/or written to if it is writable) later by libavcodec.
2042 * avcodec_align_dimensions2() should be used to find the required width and
2043 * height, as they normally need to be rounded up to the next multiple of 16.
2045 * If frame multithreading is used and thread_safe_callbacks is set,
2046 * this callback may be called from a different thread, but not from more
2047 * than one at once. Does not need to be reentrant.
2049 * @see avcodec_align_dimensions2()
2053 * Decoders request a buffer of a particular size by setting
2054 * AVFrame.nb_samples prior to calling get_buffer2(). The decoder may,
2055 * however, utilize only part of the buffer by setting AVFrame.nb_samples
2056 * to a smaller value in the output frame.
2058 * As a convenience, av_samples_get_buffer_size() and
2059 * av_samples_fill_arrays() in libavutil may be used by custom get_buffer2()
2060 * functions to find the required data size and to fill data pointers and
2061 * linesize. In AVFrame.linesize, only linesize[0] may be set for audio
2062 * since all planes must be the same size.
2064 * @see av_samples_get_buffer_size(), av_samples_fill_arrays()
2066 * - encoding: unused
2067 * - decoding: Set by libavcodec, user can override.
2069 int (*get_buffer2)(struct AVCodecContext *s, AVFrame *frame, int flags);
2072 * If non-zero, the decoded audio and video frames returned from
2073 * avcodec_decode_video2() and avcodec_decode_audio4() are reference-counted
2074 * and are valid indefinitely. The caller must free them with
2075 * av_frame_unref() when they are not needed anymore.
2076 * Otherwise, the decoded frames must not be freed by the caller and are
2077 * only valid until the next decode call.
2079 * - encoding: unused
2080 * - decoding: set by the caller before avcodec_open2().
2082 int refcounted_frames;
2084 /* - encoding parameters */
2085 float qcompress; ///< amount of qscale change between easy & hard scenes (0.0-1.0)
2086 float qblur; ///< amount of qscale smoothing over time (0.0-1.0)
2090 * - encoding: Set by user.
2091 * - decoding: unused
2097 * - encoding: Set by user.
2098 * - decoding: unused
2103 * maximum quantizer difference between frames
2104 * - encoding: Set by user.
2105 * - decoding: unused
2110 * ratecontrol qmin qmax limiting method
2111 * 0-> clipping, 1-> use a nice continuous function to limit qscale wthin qmin/qmax.
2112 * - encoding: Set by user.
2113 * - decoding: unused
2121 * decoder bitstream buffer size
2122 * - encoding: Set by user.
2123 * - decoding: unused
2128 * ratecontrol override, see RcOverride
2129 * - encoding: Allocated/set/freed by user.
2130 * - decoding: unused
2132 int rc_override_count;
2133 RcOverride *rc_override;
2136 * rate control equation
2137 * - encoding: Set by user
2138 * - decoding: unused
2144 * - encoding: Set by user.
2145 * - decoding: unused
2151 * - encoding: Set by user.
2152 * - decoding: unused
2156 float rc_buffer_aggressivity;
2159 * initial complexity for pass1 ratecontrol
2160 * - encoding: Set by user.
2161 * - decoding: unused
2163 float rc_initial_cplx;
2166 * Ratecontrol attempt to use, at maximum, <value> of what can be used without an underflow.
2167 * - encoding: Set by user.
2168 * - decoding: unused.
2170 float rc_max_available_vbv_use;
2173 * Ratecontrol attempt to use, at least, <value> times the amount needed to prevent a vbv overflow.
2174 * - encoding: Set by user.
2175 * - decoding: unused.
2177 float rc_min_vbv_overflow_use;
2180 * Number of bits which should be loaded into the rc buffer before decoding starts.
2181 * - encoding: Set by user.
2182 * - decoding: unused
2184 int rc_initial_buffer_occupancy;
2186 #define FF_CODER_TYPE_VLC 0
2187 #define FF_CODER_TYPE_AC 1
2188 #define FF_CODER_TYPE_RAW 2
2189 #define FF_CODER_TYPE_RLE 3
2190 #define FF_CODER_TYPE_DEFLATE 4
2193 * - encoding: Set by user.
2194 * - decoding: unused
2200 * - encoding: Set by user.
2201 * - decoding: unused
2206 * minimum Lagrange multipler
2207 * - encoding: Set by user.
2208 * - decoding: unused
2213 * maximum Lagrange multipler
2214 * - encoding: Set by user.
2215 * - decoding: unused
2220 * frame skip threshold
2221 * - encoding: Set by user.
2222 * - decoding: unused
2224 int frame_skip_threshold;
2228 * - encoding: Set by user.
2229 * - decoding: unused
2231 int frame_skip_factor;
2234 * frame skip exponent
2235 * - encoding: Set by user.
2236 * - decoding: unused
2241 * frame skip comparison function
2242 * - encoding: Set by user.
2243 * - decoding: unused
2248 * trellis RD quantization
2249 * - encoding: Set by user.
2250 * - decoding: unused
2255 * - encoding: Set by user.
2256 * - decoding: unused
2258 int min_prediction_order;
2261 * - encoding: Set by user.
2262 * - decoding: unused
2264 int max_prediction_order;
2267 * GOP timecode frame start number, in non drop frame format
2268 * - encoding: Set by user.
2269 * - decoding: unused
2271 int64_t timecode_frame_start;
2273 /* The RTP callback: This function is called */
2274 /* every time the encoder has a packet to send. */
2275 /* It depends on the encoder if the data starts */
2276 /* with a Start Code (it should). H.263 does. */
2277 /* mb_nb contains the number of macroblocks */
2278 /* encoded in the RTP payload. */
2279 void (*rtp_callback)(struct AVCodecContext *avctx, void *data, int size, int mb_nb);
2281 int rtp_payload_size; /* The size of the RTP payload: the coder will */
2282 /* do its best to deliver a chunk with size */
2283 /* below rtp_payload_size, the chunk will start */
2284 /* with a start code on some codecs like H.263. */
2285 /* This doesn't take account of any particular */
2286 /* headers inside the transmitted RTP payload. */
2288 /* statistics, used for 2-pass encoding */
2299 * number of bits used for the previously encoded frame
2300 * - encoding: Set by libavcodec.
2301 * - decoding: unused
2306 * pass1 encoding statistics output buffer
2307 * - encoding: Set by libavcodec.
2308 * - decoding: unused
2313 * pass2 encoding statistics input buffer
2314 * Concatenated stuff from stats_out of pass1 should be placed here.
2315 * - encoding: Allocated/set/freed by user.
2316 * - decoding: unused
2321 * Work around bugs in encoders which sometimes cannot be detected automatically.
2322 * - encoding: Set by user
2323 * - decoding: Set by user
2325 int workaround_bugs;
2326 #define FF_BUG_AUTODETECT 1 ///< autodetection
2327 #if FF_API_OLD_MSMPEG4
2328 #define FF_BUG_OLD_MSMPEG4 2
2330 #define FF_BUG_XVID_ILACE 4
2331 #define FF_BUG_UMP4 8
2332 #define FF_BUG_NO_PADDING 16
2333 #define FF_BUG_AMV 32
2335 #define FF_BUG_AC_VLC 0 ///< Will be removed, libavcodec can now handle these non-compliant files by default.
2337 #define FF_BUG_QPEL_CHROMA 64
2338 #define FF_BUG_STD_QPEL 128
2339 #define FF_BUG_QPEL_CHROMA2 256
2340 #define FF_BUG_DIRECT_BLOCKSIZE 512
2341 #define FF_BUG_EDGE 1024
2342 #define FF_BUG_HPEL_CHROMA 2048
2343 #define FF_BUG_DC_CLIP 4096
2344 #define FF_BUG_MS 8192 ///< Work around various bugs in Microsoft's broken decoders.
2345 #define FF_BUG_TRUNCATED 16384
2348 * strictly follow the standard (MPEG4, ...).
2349 * - encoding: Set by user.
2350 * - decoding: Set by user.
2351 * Setting this to STRICT or higher means the encoder and decoder will
2352 * generally do stupid things, whereas setting it to unofficial or lower
2353 * will mean the encoder might produce output that is not supported by all
2354 * spec-compliant decoders. Decoders don't differentiate between normal,
2355 * unofficial and experimental (that is, they always try to decode things
2356 * when they can) unless they are explicitly asked to behave stupidly
2357 * (=strictly conform to the specs)
2359 int strict_std_compliance;
2360 #define FF_COMPLIANCE_VERY_STRICT 2 ///< Strictly conform to an older more strict version of the spec or reference software.
2361 #define FF_COMPLIANCE_STRICT 1 ///< Strictly conform to all the things in the spec no matter what consequences.
2362 #define FF_COMPLIANCE_NORMAL 0
2363 #define FF_COMPLIANCE_UNOFFICIAL -1 ///< Allow unofficial extensions
2364 #define FF_COMPLIANCE_EXPERIMENTAL -2 ///< Allow nonstandardized experimental things.
2367 * error concealment flags
2368 * - encoding: unused
2369 * - decoding: Set by user.
2371 int error_concealment;
2372 #define FF_EC_GUESS_MVS 1
2373 #define FF_EC_DEBLOCK 2
2377 * - encoding: Set by user.
2378 * - decoding: Set by user.
2381 #define FF_DEBUG_PICT_INFO 1
2382 #define FF_DEBUG_RC 2
2383 #define FF_DEBUG_BITSTREAM 4
2384 #define FF_DEBUG_MB_TYPE 8
2385 #define FF_DEBUG_QP 16
2388 * @deprecated this option does nothing
2390 #define FF_DEBUG_MV 32
2392 #define FF_DEBUG_DCT_COEFF 0x00000040
2393 #define FF_DEBUG_SKIP 0x00000080
2394 #define FF_DEBUG_STARTCODE 0x00000100
2395 #define FF_DEBUG_PTS 0x00000200
2396 #define FF_DEBUG_ER 0x00000400
2397 #define FF_DEBUG_MMCO 0x00000800
2398 #define FF_DEBUG_BUGS 0x00001000
2400 #define FF_DEBUG_VIS_QP 0x00002000
2401 #define FF_DEBUG_VIS_MB_TYPE 0x00004000
2403 #define FF_DEBUG_BUFFERS 0x00008000
2404 #define FF_DEBUG_THREADS 0x00010000
2408 * @deprecated this option does not have any effect
2410 attribute_deprecated
2412 #define FF_DEBUG_VIS_MV_P_FOR 0x00000001 //visualize forward predicted MVs of P frames
2413 #define FF_DEBUG_VIS_MV_B_FOR 0x00000002 //visualize forward predicted MVs of B frames
2414 #define FF_DEBUG_VIS_MV_B_BACK 0x00000004 //visualize backward predicted MVs of B frames
2418 * Error recognition; may misdetect some more or less valid parts as errors.
2419 * - encoding: unused
2420 * - decoding: Set by user.
2422 int err_recognition;
2425 * Verify checksums embedded in the bitstream (could be of either encoded or
2426 * decoded data, depending on the codec) and print an error message on mismatch.
2427 * If AV_EF_EXPLODE is also set, a mismatching checksum will result in the
2428 * decoder returning an error.
2430 #define AV_EF_CRCCHECK (1<<0)
2431 #define AV_EF_BITSTREAM (1<<1)
2432 #define AV_EF_BUFFER (1<<2)
2433 #define AV_EF_EXPLODE (1<<3)
2436 * opaque 64bit number (generally a PTS) that will be reordered and
2437 * output in AVFrame.reordered_opaque
2438 * @deprecated in favor of pkt_pts
2439 * - encoding: unused
2440 * - decoding: Set by user.
2442 int64_t reordered_opaque;
2445 * Hardware accelerator in use
2446 * - encoding: unused.
2447 * - decoding: Set by libavcodec
2449 struct AVHWAccel *hwaccel;
2452 * Hardware accelerator context.
2453 * For some hardware accelerators, a global context needs to be
2454 * provided by the user. In that case, this holds display-dependent
2455 * data Libav cannot instantiate itself. Please refer to the
2456 * Libav HW accelerator documentation to know how to fill this
2457 * is. e.g. for VA API, this is a struct vaapi_context.
2458 * - encoding: unused
2459 * - decoding: Set by user
2461 void *hwaccel_context;
2465 * - encoding: Set by libavcodec if flags&CODEC_FLAG_PSNR.
2466 * - decoding: unused
2468 uint64_t error[AV_NUM_DATA_POINTERS];
2471 * DCT algorithm, see FF_DCT_* below
2472 * - encoding: Set by user.
2473 * - decoding: unused
2476 #define FF_DCT_AUTO 0
2477 #define FF_DCT_FASTINT 1
2478 #define FF_DCT_INT 2
2479 #define FF_DCT_MMX 3
2480 #define FF_DCT_ALTIVEC 5
2481 #define FF_DCT_FAAN 6
2484 * IDCT algorithm, see FF_IDCT_* below.
2485 * - encoding: Set by user.
2486 * - decoding: Set by user.
2489 #define FF_IDCT_AUTO 0
2490 #define FF_IDCT_INT 1
2491 #define FF_IDCT_SIMPLE 2
2492 #define FF_IDCT_SIMPLEMMX 3
2493 #define FF_IDCT_ARM 7
2494 #define FF_IDCT_ALTIVEC 8
2496 #define FF_IDCT_SH4 9
2498 #define FF_IDCT_SIMPLEARM 10
2499 #define FF_IDCT_IPP 13
2500 #define FF_IDCT_XVIDMMX 14
2501 #define FF_IDCT_SIMPLEARMV5TE 16
2502 #define FF_IDCT_SIMPLEARMV6 17
2503 #if FF_API_ARCH_SPARC
2504 #define FF_IDCT_SIMPLEVIS 18
2506 #define FF_IDCT_FAAN 20
2507 #define FF_IDCT_SIMPLENEON 22
2508 #if FF_API_ARCH_ALPHA
2509 #define FF_IDCT_SIMPLEALPHA 23
2513 * bits per sample/pixel from the demuxer (needed for huffyuv).
2514 * - encoding: Set by libavcodec.
2515 * - decoding: Set by user.
2517 int bits_per_coded_sample;
2520 * Bits per sample/pixel of internal libavcodec pixel/sample format.
2521 * - encoding: set by user.
2522 * - decoding: set by libavcodec.
2524 int bits_per_raw_sample;
2528 * low resolution decoding, 1-> 1/2 size, 2->1/4 size
2529 * - encoding: unused
2530 * - decoding: Set by user.
2532 * @deprecated use decoder private options instead
2534 attribute_deprecated int lowres;
2538 * the picture in the bitstream
2539 * - encoding: Set by libavcodec.
2540 * - decoding: unused
2542 AVFrame *coded_frame;
2546 * is used to decide how many independent tasks should be passed to execute()
2547 * - encoding: Set by user.
2548 * - decoding: Set by user.
2553 * Which multithreading methods to use.
2554 * Use of FF_THREAD_FRAME will increase decoding delay by one frame per thread,
2555 * so clients which cannot provide future frames should not use it.
2557 * - encoding: Set by user, otherwise the default is used.
2558 * - decoding: Set by user, otherwise the default is used.
2561 #define FF_THREAD_FRAME 1 ///< Decode more than one frame at once
2562 #define FF_THREAD_SLICE 2 ///< Decode more than one part of a single frame at once
2565 * Which multithreading methods are in use by the codec.
2566 * - encoding: Set by libavcodec.
2567 * - decoding: Set by libavcodec.
2569 int active_thread_type;
2572 * Set by the client if its custom get_buffer() callback can be called
2573 * synchronously from another thread, which allows faster multithreaded decoding.
2574 * draw_horiz_band() will be called from other threads regardless of this setting.
2575 * Ignored if the default get_buffer() is used.
2576 * - encoding: Set by user.
2577 * - decoding: Set by user.
2579 int thread_safe_callbacks;
2582 * The codec may call this to execute several independent things.
2583 * It will return only after finishing all tasks.
2584 * The user may replace this with some multithreaded implementation,
2585 * the default implementation will execute the parts serially.
2586 * @param count the number of things to execute
2587 * - encoding: Set by libavcodec, user can override.
2588 * - decoding: Set by libavcodec, user can override.
2590 int (*execute)(struct AVCodecContext *c, int (*func)(struct AVCodecContext *c2, void *arg), void *arg2, int *ret, int count, int size);
2593 * The codec may call this to execute several independent things.
2594 * It will return only after finishing all tasks.
2595 * The user may replace this with some multithreaded implementation,
2596 * the default implementation will execute the parts serially.
2597 * Also see avcodec_thread_init and e.g. the --enable-pthread configure option.
2598 * @param c context passed also to func
2599 * @param count the number of things to execute
2600 * @param arg2 argument passed unchanged to func
2601 * @param ret return values of executed functions, must have space for "count" values. May be NULL.
2602 * @param func function that will be called count times, with jobnr from 0 to count-1.
2603 * threadnr will be in the range 0 to c->thread_count-1 < MAX_THREADS and so that no
2604 * two instances of func executing at the same time will have the same threadnr.
2605 * @return always 0 currently, but code should handle a future improvement where when any call to func
2606 * returns < 0 no further calls to func may be done and < 0 is returned.
2607 * - encoding: Set by libavcodec, user can override.
2608 * - decoding: Set by libavcodec, user can override.
2610 int (*execute2)(struct AVCodecContext *c, int (*func)(struct AVCodecContext *c2, void *arg, int jobnr, int threadnr), void *arg2, int *ret, int count);
2612 #if FF_API_THREAD_OPAQUE
2614 * @deprecated this field should not be used from outside of lavc
2616 attribute_deprecated
2617 void *thread_opaque;
2621 * noise vs. sse weight for the nsse comparsion function
2622 * - encoding: Set by user.
2623 * - decoding: unused
2629 * - encoding: Set by user.
2630 * - decoding: Set by libavcodec.
2633 #define FF_PROFILE_UNKNOWN -99
2634 #define FF_PROFILE_RESERVED -100
2636 #define FF_PROFILE_AAC_MAIN 0
2637 #define FF_PROFILE_AAC_LOW 1
2638 #define FF_PROFILE_AAC_SSR 2
2639 #define FF_PROFILE_AAC_LTP 3
2640 #define FF_PROFILE_AAC_HE 4
2641 #define FF_PROFILE_AAC_HE_V2 28
2642 #define FF_PROFILE_AAC_LD 22
2643 #define FF_PROFILE_AAC_ELD 38
2644 #define FF_PROFILE_MPEG2_AAC_LOW 128
2645 #define FF_PROFILE_MPEG2_AAC_HE 131
2647 #define FF_PROFILE_DTS 20
2648 #define FF_PROFILE_DTS_ES 30
2649 #define FF_PROFILE_DTS_96_24 40
2650 #define FF_PROFILE_DTS_HD_HRA 50
2651 #define FF_PROFILE_DTS_HD_MA 60
2653 #define FF_PROFILE_MPEG2_422 0
2654 #define FF_PROFILE_MPEG2_HIGH 1
2655 #define FF_PROFILE_MPEG2_SS 2
2656 #define FF_PROFILE_MPEG2_SNR_SCALABLE 3
2657 #define FF_PROFILE_MPEG2_MAIN 4
2658 #define FF_PROFILE_MPEG2_SIMPLE 5
2660 #define FF_PROFILE_H264_CONSTRAINED (1<<9) // 8+1; constraint_set1_flag
2661 #define FF_PROFILE_H264_INTRA (1<<11) // 8+3; constraint_set3_flag
2663 #define FF_PROFILE_H264_BASELINE 66
2664 #define FF_PROFILE_H264_CONSTRAINED_BASELINE (66|FF_PROFILE_H264_CONSTRAINED)
2665 #define FF_PROFILE_H264_MAIN 77
2666 #define FF_PROFILE_H264_EXTENDED 88
2667 #define FF_PROFILE_H264_HIGH 100
2668 #define FF_PROFILE_H264_HIGH_10 110
2669 #define FF_PROFILE_H264_HIGH_10_INTRA (110|FF_PROFILE_H264_INTRA)
2670 #define FF_PROFILE_H264_HIGH_422 122
2671 #define FF_PROFILE_H264_HIGH_422_INTRA (122|FF_PROFILE_H264_INTRA)
2672 #define FF_PROFILE_H264_HIGH_444 144
2673 #define FF_PROFILE_H264_HIGH_444_PREDICTIVE 244
2674 #define FF_PROFILE_H264_HIGH_444_INTRA (244|FF_PROFILE_H264_INTRA)
2675 #define FF_PROFILE_H264_CAVLC_444 44
2677 #define FF_PROFILE_VC1_SIMPLE 0
2678 #define FF_PROFILE_VC1_MAIN 1
2679 #define FF_PROFILE_VC1_COMPLEX 2
2680 #define FF_PROFILE_VC1_ADVANCED 3
2682 #define FF_PROFILE_MPEG4_SIMPLE 0
2683 #define FF_PROFILE_MPEG4_SIMPLE_SCALABLE 1
2684 #define FF_PROFILE_MPEG4_CORE 2
2685 #define FF_PROFILE_MPEG4_MAIN 3
2686 #define FF_PROFILE_MPEG4_N_BIT 4
2687 #define FF_PROFILE_MPEG4_SCALABLE_TEXTURE 5
2688 #define FF_PROFILE_MPEG4_SIMPLE_FACE_ANIMATION 6
2689 #define FF_PROFILE_MPEG4_BASIC_ANIMATED_TEXTURE 7
2690 #define FF_PROFILE_MPEG4_HYBRID 8
2691 #define FF_PROFILE_MPEG4_ADVANCED_REAL_TIME 9
2692 #define FF_PROFILE_MPEG4_CORE_SCALABLE 10
2693 #define FF_PROFILE_MPEG4_ADVANCED_CODING 11
2694 #define FF_PROFILE_MPEG4_ADVANCED_CORE 12
2695 #define FF_PROFILE_MPEG4_ADVANCED_SCALABLE_TEXTURE 13
2696 #define FF_PROFILE_MPEG4_SIMPLE_STUDIO 14
2697 #define FF_PROFILE_MPEG4_ADVANCED_SIMPLE 15
2699 #define FF_PROFILE_JPEG2000_CSTREAM_RESTRICTION_0 0
2700 #define FF_PROFILE_JPEG2000_CSTREAM_RESTRICTION_1 1
2701 #define FF_PROFILE_JPEG2000_CSTREAM_NO_RESTRICTION 2
2702 #define FF_PROFILE_JPEG2000_DCINEMA_2K 3
2703 #define FF_PROFILE_JPEG2000_DCINEMA_4K 4
2706 #define FF_PROFILE_HEVC_MAIN 1
2707 #define FF_PROFILE_HEVC_MAIN_10 2
2708 #define FF_PROFILE_HEVC_MAIN_STILL_PICTURE 3
2712 * - encoding: Set by user.
2713 * - decoding: Set by libavcodec.
2716 #define FF_LEVEL_UNKNOWN -99
2720 * - encoding: unused
2721 * - decoding: Set by user.
2723 enum AVDiscard skip_loop_filter;
2727 * - encoding: unused
2728 * - decoding: Set by user.
2730 enum AVDiscard skip_idct;
2734 * - encoding: unused
2735 * - decoding: Set by user.
2737 enum AVDiscard skip_frame;
2740 * Header containing style information for text subtitles.
2741 * For SUBTITLE_ASS subtitle type, it should contain the whole ASS
2742 * [Script Info] and [V4+ Styles] section, plus the [Events] line and
2743 * the Format line following. It shouldn't include any Dialogue line.
2744 * - encoding: Set/allocated/freed by user (before avcodec_open2())
2745 * - decoding: Set/allocated/freed by libavcodec (by avcodec_open2())
2747 uint8_t *subtitle_header;
2748 int subtitle_header_size;
2750 #if FF_API_ERROR_RATE
2752 * @deprecated use the 'error_rate' private AVOption of the mpegvideo
2755 attribute_deprecated
2759 #if FF_API_CODEC_PKT
2761 * @deprecated this field is not supposed to be accessed from outside lavc
2763 attribute_deprecated
2768 * VBV delay coded in the last frame (in periods of a 27 MHz clock).
2769 * Used for compliant TS muxing.
2770 * - encoding: Set by libavcodec.
2771 * - decoding: unused.
2779 typedef struct AVProfile {
2781 const char *name; ///< short name for the profile
2784 typedef struct AVCodecDefault AVCodecDefault;
2791 typedef struct AVCodec {
2793 * Name of the codec implementation.
2794 * The name is globally unique among encoders and among decoders (but an
2795 * encoder and a decoder can share the same name).
2796 * This is the primary way to find a codec from the user perspective.
2800 * Descriptive name for the codec, meant to be more human readable than name.
2801 * You should use the NULL_IF_CONFIG_SMALL() macro to define it.
2803 const char *long_name;
2804 enum AVMediaType type;
2807 * Codec capabilities.
2811 const AVRational *supported_framerates; ///< array of supported framerates, or NULL if any, array is terminated by {0,0}
2812 const enum AVPixelFormat *pix_fmts; ///< array of supported pixel formats, or NULL if unknown, array is terminated by -1
2813 const int *supported_samplerates; ///< array of supported audio samplerates, or NULL if unknown, array is terminated by 0
2814 const enum AVSampleFormat *sample_fmts; ///< array of supported sample formats, or NULL if unknown, array is terminated by -1
2815 const uint64_t *channel_layouts; ///< array of support channel layouts, or NULL if unknown. array is terminated by 0
2817 attribute_deprecated uint8_t max_lowres; ///< maximum value for lowres supported by the decoder
2819 const AVClass *priv_class; ///< AVClass for the private context
2820 const AVProfile *profiles; ///< array of recognized profiles, or NULL if unknown, array is terminated by {FF_PROFILE_UNKNOWN}
2822 /*****************************************************************
2823 * No fields below this line are part of the public API. They
2824 * may not be used outside of libavcodec and can be changed and
2826 * New public fields should be added right above.
2827 *****************************************************************
2830 struct AVCodec *next;
2832 * @name Frame-level threading support functions
2836 * If defined, called on thread contexts when they are created.
2837 * If the codec allocates writable tables in init(), re-allocate them here.
2838 * priv_data will be set to a copy of the original.
2840 int (*init_thread_copy)(AVCodecContext *);
2842 * Copy necessary context variables from a previous thread context to the current one.
2843 * If not defined, the next thread will start automatically; otherwise, the codec
2844 * must call ff_thread_finish_setup().
2846 * dst and src will (rarely) point to the same context, in which case memcpy should be skipped.
2848 int (*update_thread_context)(AVCodecContext *dst, const AVCodecContext *src);
2852 * Private codec-specific defaults.
2854 const AVCodecDefault *defaults;
2857 * Initialize codec static data, called from avcodec_register().
2859 void (*init_static_data)(struct AVCodec *codec);
2861 int (*init)(AVCodecContext *);
2862 int (*encode_sub)(AVCodecContext *, uint8_t *buf, int buf_size,
2863 const struct AVSubtitle *sub);
2865 * Encode data to an AVPacket.
2867 * @param avctx codec context
2868 * @param avpkt output AVPacket (may contain a user-provided buffer)
2869 * @param[in] frame AVFrame containing the raw data to be encoded
2870 * @param[out] got_packet_ptr encoder sets to 0 or 1 to indicate that a
2871 * non-empty packet was returned in avpkt.
2872 * @return 0 on success, negative error code on failure
2874 int (*encode2)(AVCodecContext *avctx, AVPacket *avpkt, const AVFrame *frame,
2875 int *got_packet_ptr);
2876 int (*decode)(AVCodecContext *, void *outdata, int *outdata_size, AVPacket *avpkt);
2877 int (*close)(AVCodecContext *);
2880 * Will be called when seeking
2882 void (*flush)(AVCodecContext *);
2888 typedef struct AVHWAccel {
2890 * Name of the hardware accelerated codec.
2891 * The name is globally unique among encoders and among decoders (but an
2892 * encoder and a decoder can share the same name).
2897 * Type of codec implemented by the hardware accelerator.
2899 * See AVMEDIA_TYPE_xxx
2901 enum AVMediaType type;
2904 * Codec implemented by the hardware accelerator.
2906 * See AV_CODEC_ID_xxx
2911 * Supported pixel format.
2913 * Only hardware accelerated formats are supported here.
2915 enum AVPixelFormat pix_fmt;
2918 * Hardware accelerated codec capabilities.
2919 * see FF_HWACCEL_CODEC_CAP_*
2923 struct AVHWAccel *next;
2926 * Called at the beginning of each frame or field picture.
2928 * Meaningful frame information (codec specific) is guaranteed to
2929 * be parsed at this point. This function is mandatory.
2931 * Note that buf can be NULL along with buf_size set to 0.
2932 * Otherwise, this means the whole frame is available at this point.
2934 * @param avctx the codec context
2935 * @param buf the frame data buffer base
2936 * @param buf_size the size of the frame in bytes
2937 * @return zero if successful, a negative value otherwise
2939 int (*start_frame)(AVCodecContext *avctx, const uint8_t *buf, uint32_t buf_size);
2942 * Callback for each slice.
2944 * Meaningful slice information (codec specific) is guaranteed to
2945 * be parsed at this point. This function is mandatory.
2947 * @param avctx the codec context
2948 * @param buf the slice data buffer base
2949 * @param buf_size the size of the slice in bytes
2950 * @return zero if successful, a negative value otherwise
2952 int (*decode_slice)(AVCodecContext *avctx, const uint8_t *buf, uint32_t buf_size);
2955 * Called at the end of each frame or field picture.
2957 * The whole picture is parsed at this point and can now be sent
2958 * to the hardware accelerator. This function is mandatory.
2960 * @param avctx the codec context
2961 * @return zero if successful, a negative value otherwise
2963 int (*end_frame)(AVCodecContext *avctx);
2966 * Size of HW accelerator private data.
2968 * Private data is allocated with av_mallocz() before
2969 * AVCodecContext.get_buffer() and deallocated after
2970 * AVCodecContext.release_buffer().
2976 * @defgroup lavc_picture AVPicture
2978 * Functions for working with AVPicture
2983 * four components are given, that's all.
2984 * the last component is alpha
2986 typedef struct AVPicture {
2987 uint8_t *data[AV_NUM_DATA_POINTERS];
2988 int linesize[AV_NUM_DATA_POINTERS]; ///< number of bytes per line
2995 #define AVPALETTE_SIZE 1024
2996 #define AVPALETTE_COUNT 256
2998 enum AVSubtitleType {
3001 SUBTITLE_BITMAP, ///< A bitmap, pict will be set
3004 * Plain text, the text field must be set by the decoder and is
3005 * authoritative. ass and pict fields may contain approximations.
3010 * Formatted text, the ass field must be set by the decoder and is
3011 * authoritative. pict and text fields may contain approximations.
3016 #define AV_SUBTITLE_FLAG_FORCED 0x00000001
3018 typedef struct AVSubtitleRect {
3019 int x; ///< top left corner of pict, undefined when pict is not set
3020 int y; ///< top left corner of pict, undefined when pict is not set
3021 int w; ///< width of pict, undefined when pict is not set
3022 int h; ///< height of pict, undefined when pict is not set
3023 int nb_colors; ///< number of colors in pict, undefined when pict is not set
3026 * data+linesize for the bitmap of this subtitle.
3027 * can be set for text/ass as well once they where rendered
3030 enum AVSubtitleType type;
3032 char *text; ///< 0 terminated plain UTF-8 text
3035 * 0 terminated ASS/SSA compatible event line.
3036 * The pressentation of this is unaffected by the other values in this
3043 typedef struct AVSubtitle {
3044 uint16_t format; /* 0 = graphics */
3045 uint32_t start_display_time; /* relative to packet pts, in ms */
3046 uint32_t end_display_time; /* relative to packet pts, in ms */
3048 AVSubtitleRect **rects;
3049 int64_t pts; ///< Same as packet pts, in AV_TIME_BASE
3053 * If c is NULL, returns the first registered codec,
3054 * if c is non-NULL, returns the next registered codec after c,
3055 * or NULL if c is the last one.
3057 AVCodec *av_codec_next(const AVCodec *c);
3060 * Return the LIBAVCODEC_VERSION_INT constant.
3062 unsigned avcodec_version(void);
3065 * Return the libavcodec build-time configuration.
3067 const char *avcodec_configuration(void);
3070 * Return the libavcodec license.
3072 const char *avcodec_license(void);
3075 * Register the codec codec and initialize libavcodec.
3077 * @warning either this function or avcodec_register_all() must be called
3078 * before any other libavcodec functions.
3080 * @see avcodec_register_all()
3082 void avcodec_register(AVCodec *codec);
3085 * Register all the codecs, parsers and bitstream filters which were enabled at
3086 * configuration time. If you do not call this function you can select exactly
3087 * which formats you want to support, by using the individual registration
3090 * @see avcodec_register
3091 * @see av_register_codec_parser
3092 * @see av_register_bitstream_filter
3094 void avcodec_register_all(void);
3097 * Allocate an AVCodecContext and set its fields to default values. The
3098 * resulting struct can be deallocated by calling avcodec_close() on it followed
3101 * @param codec if non-NULL, allocate private data and initialize defaults
3102 * for the given codec. It is illegal to then call avcodec_open2()
3103 * with a different codec.
3104 * If NULL, then the codec-specific defaults won't be initialized,
3105 * which may result in suboptimal default settings (this is
3106 * important mainly for encoders, e.g. libx264).
3108 * @return An AVCodecContext filled with default values or NULL on failure.
3109 * @see avcodec_get_context_defaults
3111 AVCodecContext *avcodec_alloc_context3(const AVCodec *codec);
3114 * Set the fields of the given AVCodecContext to default values corresponding
3115 * to the given codec (defaults may be codec-dependent).
3117 * Do not call this function if a non-NULL codec has been passed
3118 * to avcodec_alloc_context3() that allocated this AVCodecContext.
3119 * If codec is non-NULL, it is illegal to call avcodec_open2() with a
3120 * different codec on this AVCodecContext.
3122 int avcodec_get_context_defaults3(AVCodecContext *s, const AVCodec *codec);
3125 * Get the AVClass for AVCodecContext. It can be used in combination with
3126 * AV_OPT_SEARCH_FAKE_OBJ for examining options.
3128 * @see av_opt_find().
3130 const AVClass *avcodec_get_class(void);
3133 * Copy the settings of the source AVCodecContext into the destination
3134 * AVCodecContext. The resulting destination codec context will be
3135 * unopened, i.e. you are required to call avcodec_open2() before you
3136 * can use this AVCodecContext to decode/encode video/audio data.
3138 * @param dest target codec context, should be initialized with
3139 * avcodec_alloc_context3(), but otherwise uninitialized
3140 * @param src source codec context
3141 * @return AVERROR() on error (e.g. memory allocation error), 0 on success
3143 int avcodec_copy_context(AVCodecContext *dest, const AVCodecContext *src);
3145 #if FF_API_AVFRAME_LAVC
3147 * @deprecated use av_frame_alloc()
3149 attribute_deprecated
3150 AVFrame *avcodec_alloc_frame(void);
3153 * Set the fields of the given AVFrame to default values.
3155 * @param frame The AVFrame of which the fields should be set to default values.
3157 * @deprecated use av_frame_unref()
3159 attribute_deprecated
3160 void avcodec_get_frame_defaults(AVFrame *frame);
3163 * Free the frame and any dynamically allocated objects in it,
3164 * e.g. extended_data.
3166 * @param frame frame to be freed. The pointer will be set to NULL.
3168 * @warning this function does NOT free the data buffers themselves
3169 * (it does not know how, since they might have been allocated with
3170 * a custom get_buffer()).
3172 * @deprecated use av_frame_free()
3174 attribute_deprecated
3175 void avcodec_free_frame(AVFrame **frame);
3179 * Initialize the AVCodecContext to use the given AVCodec. Prior to using this
3180 * function the context has to be allocated with avcodec_alloc_context3().
3182 * The functions avcodec_find_decoder_by_name(), avcodec_find_encoder_by_name(),
3183 * avcodec_find_decoder() and avcodec_find_encoder() provide an easy way for
3184 * retrieving a codec.
3186 * @warning This function is not thread safe!
3189 * avcodec_register_all();
3190 * av_dict_set(&opts, "b", "2.5M", 0);
3191 * codec = avcodec_find_decoder(AV_CODEC_ID_H264);
3195 * context = avcodec_alloc_context3(codec);
3197 * if (avcodec_open2(context, codec, opts) < 0)
3201 * @param avctx The context to initialize.
3202 * @param codec The codec to open this context for. If a non-NULL codec has been
3203 * previously passed to avcodec_alloc_context3() or
3204 * avcodec_get_context_defaults3() for this context, then this
3205 * parameter MUST be either NULL or equal to the previously passed
3207 * @param options A dictionary filled with AVCodecContext and codec-private options.
3208 * On return this object will be filled with options that were not found.
3210 * @return zero on success, a negative value on error
3211 * @see avcodec_alloc_context3(), avcodec_find_decoder(), avcodec_find_encoder(),
3212 * av_dict_set(), av_opt_find().
3214 int avcodec_open2(AVCodecContext *avctx, const AVCodec *codec, AVDictionary **options);
3217 * Close a given AVCodecContext and free all the data associated with it
3218 * (but not the AVCodecContext itself).
3220 * Calling this function on an AVCodecContext that hasn't been opened will free
3221 * the codec-specific data allocated in avcodec_alloc_context3() /
3222 * avcodec_get_context_defaults3() with a non-NULL codec. Subsequent calls will
3225 int avcodec_close(AVCodecContext *avctx);
3228 * Free all allocated data in the given subtitle struct.
3230 * @param sub AVSubtitle to free.
3232 void avsubtitle_free(AVSubtitle *sub);
3239 * @addtogroup lavc_packet
3243 #if FF_API_DESTRUCT_PACKET
3245 * Default packet destructor.
3246 * @deprecated use the AVBuffer API instead
3248 attribute_deprecated
3249 void av_destruct_packet(AVPacket *pkt);
3253 * Initialize optional fields of a packet with default values.
3255 * Note, this does not touch the data and size members, which have to be
3256 * initialized separately.
3260 void av_init_packet(AVPacket *pkt);
3263 * Allocate the payload of a packet and initialize its fields with
3267 * @param size wanted payload size
3268 * @return 0 if OK, AVERROR_xxx otherwise
3270 int av_new_packet(AVPacket *pkt, int size);
3273 * Reduce packet size, correctly zeroing padding
3276 * @param size new size
3278 void av_shrink_packet(AVPacket *pkt, int size);
3281 * Increase packet size, correctly zeroing padding
3284 * @param grow_by number of bytes by which to increase the size of the packet
3286 int av_grow_packet(AVPacket *pkt, int grow_by);
3289 * Initialize a reference-counted packet from av_malloc()ed data.
3291 * @param pkt packet to be initialized. This function will set the data, size,
3292 * buf and destruct fields, all others are left untouched.
3293 * @param data Data allocated by av_malloc() to be used as packet data. If this
3294 * function returns successfully, the data is owned by the underlying AVBuffer.
3295 * The caller may not access the data through other means.
3296 * @param size size of data in bytes, without the padding. I.e. the full buffer
3297 * size is assumed to be size + FF_INPUT_BUFFER_PADDING_SIZE.
3299 * @return 0 on success, a negative AVERROR on error
3301 int av_packet_from_data(AVPacket *pkt, uint8_t *data, int size);
3304 * @warning This is a hack - the packet memory allocation stuff is broken. The
3305 * packet is allocated if it was not really allocated.
3307 int av_dup_packet(AVPacket *pkt);
3312 * @param pkt packet to free
3314 void av_free_packet(AVPacket *pkt);
3317 * Allocate new information of a packet.
3320 * @param type side information type
3321 * @param size side information size
3322 * @return pointer to fresh allocated data or NULL otherwise
3324 uint8_t* av_packet_new_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
3328 * Shrink the already allocated side data buffer
3331 * @param type side information type
3332 * @param size new side information size
3333 * @return 0 on success, < 0 on failure
3335 int av_packet_shrink_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
3339 * Get side information from packet.
3342 * @param type desired side information type
3343 * @param size pointer for side information size to store (optional)
3344 * @return pointer to data if present or NULL otherwise
3346 uint8_t* av_packet_get_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
3350 * Convenience function to free all the side data stored.
3351 * All the other fields stay untouched.
3355 void av_packet_free_side_data(AVPacket *pkt);
3358 * Setup a new reference to the data described by a given packet
3360 * If src is reference-counted, setup dst as a new reference to the
3361 * buffer in src. Otherwise allocate a new buffer in dst and copy the
3362 * data from src into it.
3364 * All the other fields are copied from src.
3366 * @see av_packet_unref
3368 * @param dst Destination packet
3369 * @param src Source packet
3371 * @return 0 on success, a negative AVERROR on error.
3373 int av_packet_ref(AVPacket *dst, AVPacket *src);
3378 * Unreference the buffer referenced by the packet and reset the
3379 * remaining packet fields to their default values.
3381 * @param pkt The packet to be unreferenced.
3383 void av_packet_unref(AVPacket *pkt);
3386 * Move every field in src to dst and reset src.
3388 * @see av_packet_unref
3390 * @param src Source packet, will be reset
3391 * @param dst Destination packet
3393 void av_packet_move_ref(AVPacket *dst, AVPacket *src);
3396 * Copy only "properties" fields from src to dst.
3398 * Properties for the purpose of this function are all the fields
3399 * beside those related to the packet data (buf, data, size)
3401 * @param dst Destination packet
3402 * @param src Source packet
3404 * @return 0 on success AVERROR on failure.
3407 int av_packet_copy_props(AVPacket *dst, const AVPacket *src);
3414 * @addtogroup lavc_decoding
3419 * Find a registered decoder with a matching codec ID.
3421 * @param id AVCodecID of the requested decoder
3422 * @return A decoder if one was found, NULL otherwise.
3424 AVCodec *avcodec_find_decoder(enum AVCodecID id);
3427 * Find a registered decoder with the specified name.
3429 * @param name name of the requested decoder
3430 * @return A decoder if one was found, NULL otherwise.
3432 AVCodec *avcodec_find_decoder_by_name(const char *name);
3434 #if FF_API_GET_BUFFER
3435 attribute_deprecated int avcodec_default_get_buffer(AVCodecContext *s, AVFrame *pic);
3436 attribute_deprecated void avcodec_default_release_buffer(AVCodecContext *s, AVFrame *pic);
3437 attribute_deprecated int avcodec_default_reget_buffer(AVCodecContext *s, AVFrame *pic);
3441 * The default callback for AVCodecContext.get_buffer2(). It is made public so
3442 * it can be called by custom get_buffer2() implementations for decoders without
3443 * CODEC_CAP_DR1 set.
3445 int avcodec_default_get_buffer2(AVCodecContext *s, AVFrame *frame, int flags);
3449 * Return the amount of padding in pixels which the get_buffer callback must
3450 * provide around the edge of the image for codecs which do not have the
3451 * CODEC_FLAG_EMU_EDGE flag.
3453 * @return Required padding in pixels.
3455 * @deprecated CODEC_FLAG_EMU_EDGE is deprecated, so this function is no longer
3458 attribute_deprecated
3459 unsigned avcodec_get_edge_width(void);
3463 * Modify width and height values so that they will result in a memory
3464 * buffer that is acceptable for the codec if you do not use any horizontal
3467 * May only be used if a codec with CODEC_CAP_DR1 has been opened.
3469 void avcodec_align_dimensions(AVCodecContext *s, int *width, int *height);
3472 * Modify width and height values so that they will result in a memory
3473 * buffer that is acceptable for the codec if you also ensure that all
3474 * line sizes are a multiple of the respective linesize_align[i].
3476 * May only be used if a codec with CODEC_CAP_DR1 has been opened.
3478 void avcodec_align_dimensions2(AVCodecContext *s, int *width, int *height,
3479 int linesize_align[AV_NUM_DATA_POINTERS]);
3482 * Decode the audio frame of size avpkt->size from avpkt->data into frame.
3484 * Some decoders may support multiple frames in a single AVPacket. Such
3485 * decoders would then just decode the first frame and the return value would be
3486 * less than the packet size. In this case, avcodec_decode_audio4 has to be
3487 * called again with an AVPacket containing the remaining data in order to
3488 * decode the second frame, etc... Even if no frames are returned, the packet
3489 * needs to be fed to the decoder with remaining data until it is completely
3490 * consumed or an error occurs.
3492 * Some decoders (those marked with CODEC_CAP_DELAY) have a delay between input
3493 * and output. This means that for some packets they will not immediately
3494 * produce decoded output and need to be flushed at the end of decoding to get
3495 * all the decoded data. Flushing is done by calling this function with packets
3496 * with avpkt->data set to NULL and avpkt->size set to 0 until it stops
3497 * returning samples. It is safe to flush even those decoders that are not
3498 * marked with CODEC_CAP_DELAY, then no samples will be returned.
3500 * @warning The input buffer, avpkt->data must be FF_INPUT_BUFFER_PADDING_SIZE
3501 * larger than the actual read bytes because some optimized bitstream
3502 * readers read 32 or 64 bits at once and could read over the end.
3504 * @param avctx the codec context
3505 * @param[out] frame The AVFrame in which to store decoded audio samples.
3506 * The decoder will allocate a buffer for the decoded frame by
3507 * calling the AVCodecContext.get_buffer2() callback.
3508 * When AVCodecContext.refcounted_frames is set to 1, the frame is
3509 * reference counted and the returned reference belongs to the
3510 * caller. The caller must release the frame using av_frame_unref()
3511 * when the frame is no longer needed. The caller may safely write
3512 * to the frame if av_frame_is_writable() returns 1.
3513 * When AVCodecContext.refcounted_frames is set to 0, the returned
3514 * reference belongs to the decoder and is valid only until the
3515 * next call to this function or until closing or flushing the
3516 * decoder. The caller may not write to it.
3517 * @param[out] got_frame_ptr Zero if no frame could be decoded, otherwise it is
3518 * non-zero. Note that this field being set to zero
3519 * does not mean that an error has occurred. For
3520 * decoders with CODEC_CAP_DELAY set, no given decode
3521 * call is guaranteed to produce a frame.
3522 * @param[in] avpkt The input AVPacket containing the input buffer.
3523 * At least avpkt->data and avpkt->size should be set. Some
3524 * decoders might also require additional fields to be set.
3525 * @return A negative error code is returned if an error occurred during
3526 * decoding, otherwise the number of bytes consumed from the input
3527 * AVPacket is returned.
3529 int avcodec_decode_audio4(AVCodecContext *avctx, AVFrame *frame,
3530 int *got_frame_ptr, AVPacket *avpkt);
3533 * Decode the video frame of size avpkt->size from avpkt->data into picture.
3534 * Some decoders may support multiple frames in a single AVPacket, such
3535 * decoders would then just decode the first frame.
3537 * @warning The input buffer must be FF_INPUT_BUFFER_PADDING_SIZE larger than
3538 * the actual read bytes because some optimized bitstream readers read 32 or 64
3539 * bits at once and could read over the end.
3541 * @warning The end of the input buffer buf should be set to 0 to ensure that
3542 * no overreading happens for damaged MPEG streams.
3544 * @note Codecs which have the CODEC_CAP_DELAY capability set have a delay
3545 * between input and output, these need to be fed with avpkt->data=NULL,
3546 * avpkt->size=0 at the end to return the remaining frames.
3548 * @param avctx the codec context
3549 * @param[out] picture The AVFrame in which the decoded video frame will be stored.
3550 * Use av_frame_alloc() to get an AVFrame. The codec will
3551 * allocate memory for the actual bitmap by calling the
3552 * AVCodecContext.get_buffer2() callback.
3553 * When AVCodecContext.refcounted_frames is set to 1, the frame is
3554 * reference counted and the returned reference belongs to the
3555 * caller. The caller must release the frame using av_frame_unref()
3556 * when the frame is no longer needed. The caller may safely write
3557 * to the frame if av_frame_is_writable() returns 1.
3558 * When AVCodecContext.refcounted_frames is set to 0, the returned
3559 * reference belongs to the decoder and is valid only until the
3560 * next call to this function or until closing or flushing the
3561 * decoder. The caller may not write to it.
3563 * @param[in] avpkt The input AVpacket containing the input buffer.
3564 * You can create such packet with av_init_packet() and by then setting
3565 * data and size, some decoders might in addition need other fields like
3566 * flags&AV_PKT_FLAG_KEY. All decoders are designed to use the least
3568 * @param[in,out] got_picture_ptr Zero if no frame could be decompressed, otherwise, it is nonzero.
3569 * @return On error a negative value is returned, otherwise the number of bytes
3570 * used or zero if no frame could be decompressed.
3572 int avcodec_decode_video2(AVCodecContext *avctx, AVFrame *picture,
3573 int *got_picture_ptr,
3577 * Decode a subtitle message.
3578 * Return a negative value on error, otherwise return the number of bytes used.
3579 * If no subtitle could be decompressed, got_sub_ptr is zero.
3580 * Otherwise, the subtitle is stored in *sub.
3581 * Note that CODEC_CAP_DR1 is not available for subtitle codecs. This is for
3582 * simplicity, because the performance difference is expect to be negligible
3583 * and reusing a get_buffer written for video codecs would probably perform badly
3584 * due to a potentially very different allocation pattern.
3586 * @param avctx the codec context
3587 * @param[out] sub The AVSubtitle in which the decoded subtitle will be stored, must be
3588 freed with avsubtitle_free if *got_sub_ptr is set.
3589 * @param[in,out] got_sub_ptr Zero if no subtitle could be decompressed, otherwise, it is nonzero.
3590 * @param[in] avpkt The input AVPacket containing the input buffer.
3592 int avcodec_decode_subtitle2(AVCodecContext *avctx, AVSubtitle *sub,
3597 * @defgroup lavc_parsing Frame parsing
3601 enum AVPictureStructure {
3602 AV_PICTURE_STRUCTURE_UNKNOWN, //< unknown
3603 AV_PICTURE_STRUCTURE_TOP_FIELD, //< coded as top field
3604 AV_PICTURE_STRUCTURE_BOTTOM_FIELD, //< coded as bottom field
3605 AV_PICTURE_STRUCTURE_FRAME, //< coded as frame
3608 typedef struct AVCodecParserContext {
3610 struct AVCodecParser *parser;
3611 int64_t frame_offset; /* offset of the current frame */
3612 int64_t cur_offset; /* current offset
3613 (incremented by each av_parser_parse()) */
3614 int64_t next_frame_offset; /* offset of the next frame */
3616 int pict_type; /* XXX: Put it back in AVCodecContext. */
3618 * This field is used for proper frame duration computation in lavf.
3619 * It signals, how much longer the frame duration of the current frame
3620 * is compared to normal frame duration.
3622 * frame_duration = (1 + repeat_pict) * time_base
3624 * It is used by codecs like H.264 to display telecined material.
3626 int repeat_pict; /* XXX: Put it back in AVCodecContext. */
3627 int64_t pts; /* pts of the current frame */
3628 int64_t dts; /* dts of the current frame */
3633 int fetch_timestamp;
3635 #define AV_PARSER_PTS_NB 4
3636 int cur_frame_start_index;
3637 int64_t cur_frame_offset[AV_PARSER_PTS_NB];
3638 int64_t cur_frame_pts[AV_PARSER_PTS_NB];
3639 int64_t cur_frame_dts[AV_PARSER_PTS_NB];
3642 #define PARSER_FLAG_COMPLETE_FRAMES 0x0001
3643 #define PARSER_FLAG_ONCE 0x0002
3644 /// Set if the parser has a valid file offset
3645 #define PARSER_FLAG_FETCHED_OFFSET 0x0004
3647 int64_t offset; ///< byte offset from starting packet start
3648 int64_t cur_frame_end[AV_PARSER_PTS_NB];
3651 * Set by parser to 1 for key frames and 0 for non-key frames.
3652 * It is initialized to -1, so if the parser doesn't set this flag,
3653 * old-style fallback using AV_PICTURE_TYPE_I picture type as key frames
3659 * Time difference in stream time base units from the pts of this
3660 * packet to the point at which the output from the decoder has converged
3661 * independent from the availability of previous frames. That is, the
3662 * frames are virtually identical no matter if decoding started from
3663 * the very first frame or from this keyframe.
3664 * Is AV_NOPTS_VALUE if unknown.
3665 * This field is not the display duration of the current frame.
3666 * This field has no meaning if the packet does not have AV_PKT_FLAG_KEY
3669 * The purpose of this field is to allow seeking in streams that have no
3670 * keyframes in the conventional sense. It corresponds to the
3671 * recovery point SEI in H.264 and match_time_delta in NUT. It is also
3672 * essential for some types of subtitle streams to ensure that all
3673 * subtitles are correctly displayed after seeking.
3675 int64_t convergence_duration;
3677 // Timestamp generation support:
3679 * Synchronization point for start of timestamp generation.
3681 * Set to >0 for sync point, 0 for no sync point and <0 for undefined
3684 * For example, this corresponds to presence of H.264 buffering period
3690 * Offset of the current timestamp against last timestamp sync point in
3691 * units of AVCodecContext.time_base.
3693 * Set to INT_MIN when dts_sync_point unused. Otherwise, it must
3694 * contain a valid timestamp offset.
3696 * Note that the timestamp of sync point has usually a nonzero
3697 * dts_ref_dts_delta, which refers to the previous sync point. Offset of
3698 * the next frame after timestamp sync point will be usually 1.
3700 * For example, this corresponds to H.264 cpb_removal_delay.
3702 int dts_ref_dts_delta;
3705 * Presentation delay of current frame in units of AVCodecContext.time_base.
3707 * Set to INT_MIN when dts_sync_point unused. Otherwise, it must
3708 * contain valid non-negative timestamp delta (presentation time of a frame
3709 * must not lie in the past).
3711 * This delay represents the difference between decoding and presentation
3712 * time of the frame.
3714 * For example, this corresponds to H.264 dpb_output_delay.
3719 * Position of the packet in file.
3721 * Analogous to cur_frame_pts/dts
3723 int64_t cur_frame_pos[AV_PARSER_PTS_NB];
3726 * Byte position of currently parsed frame in stream.
3731 * Previous frame byte position.
3736 * Duration of the current frame.
3737 * For audio, this is in units of 1 / AVCodecContext.sample_rate.
3738 * For all other types, this is in units of AVCodecContext.time_base.
3742 enum AVFieldOrder field_order;
3745 * Indicate whether a picture is coded as a frame, top field or bottom field.
3747 * For example, H.264 field_pic_flag equal to 0 corresponds to
3748 * AV_PICTURE_STRUCTURE_FRAME. An H.264 picture with field_pic_flag
3749 * equal to 1 and bottom_field_flag equal to 0 corresponds to
3750 * AV_PICTURE_STRUCTURE_TOP_FIELD.
3752 enum AVPictureStructure picture_structure;
3755 * Picture number incremented in presentation or output order.
3756 * This field may be reinitialized at the first picture of a new sequence.
3758 * For example, this corresponds to H.264 PicOrderCnt.
3760 int output_picture_number;
3761 } AVCodecParserContext;
3763 typedef struct AVCodecParser {
3764 int codec_ids[5]; /* several codec IDs are permitted */
3766 int (*parser_init)(AVCodecParserContext *s);
3767 int (*parser_parse)(AVCodecParserContext *s,
3768 AVCodecContext *avctx,
3769 const uint8_t **poutbuf, int *poutbuf_size,
3770 const uint8_t *buf, int buf_size);
3771 void (*parser_close)(AVCodecParserContext *s);
3772 int (*split)(AVCodecContext *avctx, const uint8_t *buf, int buf_size);
3773 struct AVCodecParser *next;
3776 AVCodecParser *av_parser_next(AVCodecParser *c);
3778 void av_register_codec_parser(AVCodecParser *parser);
3779 AVCodecParserContext *av_parser_init(int codec_id);
3784 * @param s parser context.
3785 * @param avctx codec context.
3786 * @param poutbuf set to pointer to parsed buffer or NULL if not yet finished.
3787 * @param poutbuf_size set to size of parsed buffer or zero if not yet finished.
3788 * @param buf input buffer.
3789 * @param buf_size input length, to signal EOF, this should be 0 (so that the last frame can be output).
3790 * @param pts input presentation timestamp.
3791 * @param dts input decoding timestamp.
3792 * @param pos input byte position in stream.
3793 * @return the number of bytes of the input bitstream used.
3798 * len = av_parser_parse2(myparser, AVCodecContext, &data, &size,
3805 * decode_frame(data, size);
3809 int av_parser_parse2(AVCodecParserContext *s,
3810 AVCodecContext *avctx,
3811 uint8_t **poutbuf, int *poutbuf_size,
3812 const uint8_t *buf, int buf_size,
3813 int64_t pts, int64_t dts,
3817 * @return 0 if the output buffer is a subset of the input, 1 if it is allocated and must be freed
3818 * @deprecated use AVBitstreamFilter
3820 int av_parser_change(AVCodecParserContext *s,
3821 AVCodecContext *avctx,
3822 uint8_t **poutbuf, int *poutbuf_size,
3823 const uint8_t *buf, int buf_size, int keyframe);
3824 void av_parser_close(AVCodecParserContext *s);
3832 * @addtogroup lavc_encoding
3837 * Find a registered encoder with a matching codec ID.
3839 * @param id AVCodecID of the requested encoder
3840 * @return An encoder if one was found, NULL otherwise.
3842 AVCodec *avcodec_find_encoder(enum AVCodecID id);
3845 * Find a registered encoder with the specified name.
3847 * @param name name of the requested encoder
3848 * @return An encoder if one was found, NULL otherwise.
3850 AVCodec *avcodec_find_encoder_by_name(const char *name);
3853 * Encode a frame of audio.
3855 * Takes input samples from frame and writes the next output packet, if
3856 * available, to avpkt. The output packet does not necessarily contain data for
3857 * the most recent frame, as encoders can delay, split, and combine input frames
3858 * internally as needed.
3860 * @param avctx codec context
3861 * @param avpkt output AVPacket.
3862 * The user can supply an output buffer by setting
3863 * avpkt->data and avpkt->size prior to calling the
3864 * function, but if the size of the user-provided data is not
3865 * large enough, encoding will fail. All other AVPacket fields
3866 * will be reset by the encoder using av_init_packet(). If
3867 * avpkt->data is NULL, the encoder will allocate it.
3868 * The encoder will set avpkt->size to the size of the
3871 * If this function fails or produces no output, avpkt will be
3872 * freed using av_free_packet() (i.e. avpkt->destruct will be
3873 * called to free the user supplied buffer).
3874 * @param[in] frame AVFrame containing the raw audio data to be encoded.
3875 * May be NULL when flushing an encoder that has the
3876 * CODEC_CAP_DELAY capability set.
3877 * If CODEC_CAP_VARIABLE_FRAME_SIZE is set, then each frame
3878 * can have any number of samples.
3879 * If it is not set, frame->nb_samples must be equal to
3880 * avctx->frame_size for all frames except the last.
3881 * The final frame may be smaller than avctx->frame_size.
3882 * @param[out] got_packet_ptr This field is set to 1 by libavcodec if the
3883 * output packet is non-empty, and to 0 if it is
3884 * empty. If the function returns an error, the
3885 * packet can be assumed to be invalid, and the
3886 * value of got_packet_ptr is undefined and should
3888 * @return 0 on success, negative error code on failure
3890 int avcodec_encode_audio2(AVCodecContext *avctx, AVPacket *avpkt,
3891 const AVFrame *frame, int *got_packet_ptr);
3894 * Encode a frame of video.
3896 * Takes input raw video data from frame and writes the next output packet, if
3897 * available, to avpkt. The output packet does not necessarily contain data for
3898 * the most recent frame, as encoders can delay and reorder input frames
3899 * internally as needed.
3901 * @param avctx codec context
3902 * @param avpkt output AVPacket.
3903 * The user can supply an output buffer by setting
3904 * avpkt->data and avpkt->size prior to calling the
3905 * function, but if the size of the user-provided data is not
3906 * large enough, encoding will fail. All other AVPacket fields
3907 * will be reset by the encoder using av_init_packet(). If
3908 * avpkt->data is NULL, the encoder will allocate it.
3909 * The encoder will set avpkt->size to the size of the
3910 * output packet. The returned data (if any) belongs to the
3911 * caller, he is responsible for freeing it.
3913 * If this function fails or produces no output, avpkt will be
3914 * freed using av_free_packet() (i.e. avpkt->destruct will be
3915 * called to free the user supplied buffer).
3916 * @param[in] frame AVFrame containing the raw video data to be encoded.
3917 * May be NULL when flushing an encoder that has the
3918 * CODEC_CAP_DELAY capability set.
3919 * @param[out] got_packet_ptr This field is set to 1 by libavcodec if the
3920 * output packet is non-empty, and to 0 if it is
3921 * empty. If the function returns an error, the
3922 * packet can be assumed to be invalid, and the
3923 * value of got_packet_ptr is undefined and should
3925 * @return 0 on success, negative error code on failure
3927 int avcodec_encode_video2(AVCodecContext *avctx, AVPacket *avpkt,
3928 const AVFrame *frame, int *got_packet_ptr);
3930 int avcodec_encode_subtitle(AVCodecContext *avctx, uint8_t *buf, int buf_size,
3931 const AVSubtitle *sub);
3939 * @addtogroup lavc_picture
3944 * Allocate memory for a picture. Call avpicture_free() to free it.
3946 * @see avpicture_fill()
3948 * @param picture the picture to be filled in
3949 * @param pix_fmt the format of the picture
3950 * @param width the width of the picture
3951 * @param height the height of the picture
3952 * @return zero if successful, a negative value if not
3954 int avpicture_alloc(AVPicture *picture, enum AVPixelFormat pix_fmt, int width, int height);
3957 * Free a picture previously allocated by avpicture_alloc().
3958 * The data buffer used by the AVPicture is freed, but the AVPicture structure
3961 * @param picture the AVPicture to be freed
3963 void avpicture_free(AVPicture *picture);
3966 * Fill in the AVPicture fields.
3967 * The fields of the given AVPicture are filled in by using the 'ptr' address
3968 * which points to the image data buffer. Depending on the specified picture
3969 * format, one or multiple image data pointers and line sizes will be set.
3970 * If a planar format is specified, several pointers will be set pointing to
3971 * the different picture planes and the line sizes of the different planes
3972 * will be stored in the lines_sizes array.
3973 * Call with ptr == NULL to get the required size for the ptr buffer.
3975 * To allocate the buffer and fill in the AVPicture fields in one call,
3976 * use avpicture_alloc().
3978 * @param picture AVPicture whose fields are to be filled in
3979 * @param ptr Buffer which will contain or contains the actual image data
3980 * @param pix_fmt The format in which the picture data is stored.
3981 * @param width the width of the image in pixels
3982 * @param height the height of the image in pixels
3983 * @return size of the image data in bytes
3985 int avpicture_fill(AVPicture *picture, uint8_t *ptr,
3986 enum AVPixelFormat pix_fmt, int width, int height);
3989 * Copy pixel data from an AVPicture into a buffer.
3990 * The data is stored compactly, without any gaps for alignment or padding
3991 * which may be applied by avpicture_fill().
3993 * @see avpicture_get_size()
3995 * @param[in] src AVPicture containing image data
3996 * @param[in] pix_fmt The format in which the picture data is stored.
3997 * @param[in] width the width of the image in pixels.
3998 * @param[in] height the height of the image in pixels.
3999 * @param[out] dest A buffer into which picture data will be copied.
4000 * @param[in] dest_size The size of 'dest'.
4001 * @return The number of bytes written to dest, or a negative value (error code) on error.
4003 int avpicture_layout(const AVPicture* src, enum AVPixelFormat pix_fmt,
4004 int width, int height,
4005 unsigned char *dest, int dest_size);
4008 * Calculate the size in bytes that a picture of the given width and height
4009 * would occupy if stored in the given picture format.
4010 * Note that this returns the size of a compact representation as generated
4011 * by avpicture_layout(), which can be smaller than the size required for e.g.
4014 * @param pix_fmt the given picture format
4015 * @param width the width of the image
4016 * @param height the height of the image
4017 * @return Image data size in bytes or -1 on error (e.g. too large dimensions).
4019 int avpicture_get_size(enum AVPixelFormat pix_fmt, int width, int height);
4021 #if FF_API_DEINTERLACE
4023 * deinterlace - if not supported return -1
4025 * @deprecated - use yadif (in libavfilter) instead
4027 attribute_deprecated
4028 int avpicture_deinterlace(AVPicture *dst, const AVPicture *src,
4029 enum AVPixelFormat pix_fmt, int width, int height);
4032 * Copy image src to dst. Wraps av_picture_data_copy() above.
4034 void av_picture_copy(AVPicture *dst, const AVPicture *src,
4035 enum AVPixelFormat pix_fmt, int width, int height);
4038 * Crop image top and left side.
4040 int av_picture_crop(AVPicture *dst, const AVPicture *src,
4041 enum AVPixelFormat pix_fmt, int top_band, int left_band);
4046 int av_picture_pad(AVPicture *dst, const AVPicture *src, int height, int width, enum AVPixelFormat pix_fmt,
4047 int padtop, int padbottom, int padleft, int padright, int *color);
4054 * @defgroup lavc_misc Utility functions
4057 * Miscellaneous utility functions related to both encoding and decoding
4063 * @defgroup lavc_misc_pixfmt Pixel formats
4065 * Functions for working with pixel formats.
4070 * @deprecated Use av_pix_fmt_get_chroma_sub_sample
4073 void attribute_deprecated avcodec_get_chroma_sub_sample(enum AVPixelFormat pix_fmt, int *h_shift, int *v_shift);
4076 * Return a value representing the fourCC code associated to the
4077 * pixel format pix_fmt, or 0 if no associated fourCC code can be
4080 unsigned int avcodec_pix_fmt_to_codec_tag(enum AVPixelFormat pix_fmt);
4082 #define FF_LOSS_RESOLUTION 0x0001 /**< loss due to resolution change */
4083 #define FF_LOSS_DEPTH 0x0002 /**< loss due to color depth change */
4084 #define FF_LOSS_COLORSPACE 0x0004 /**< loss due to color space conversion */
4085 #define FF_LOSS_ALPHA 0x0008 /**< loss of alpha bits */
4086 #define FF_LOSS_COLORQUANT 0x0010 /**< loss due to color quantization */
4087 #define FF_LOSS_CHROMA 0x0020 /**< loss of chroma (e.g. RGB to gray conversion) */
4090 * Compute what kind of losses will occur when converting from one specific
4091 * pixel format to another.
4092 * When converting from one pixel format to another, information loss may occur.
4093 * For example, when converting from RGB24 to GRAY, the color information will
4094 * be lost. Similarly, other losses occur when converting from some formats to
4095 * other formats. These losses can involve loss of chroma, but also loss of
4096 * resolution, loss of color depth, loss due to the color space conversion, loss
4097 * of the alpha bits or loss due to color quantization.
4098 * avcodec_get_fix_fmt_loss() informs you about the various types of losses
4099 * which will occur when converting from one pixel format to another.
4101 * @param[in] dst_pix_fmt destination pixel format
4102 * @param[in] src_pix_fmt source pixel format
4103 * @param[in] has_alpha Whether the source pixel format alpha channel is used.
4104 * @return Combination of flags informing you what kind of losses will occur.
4106 int avcodec_get_pix_fmt_loss(enum AVPixelFormat dst_pix_fmt, enum AVPixelFormat src_pix_fmt,
4110 * Find the best pixel format to convert to given a certain source pixel
4111 * format. When converting from one pixel format to another, information loss
4112 * may occur. For example, when converting from RGB24 to GRAY, the color
4113 * information will be lost. Similarly, other losses occur when converting from
4114 * some formats to other formats. avcodec_find_best_pix_fmt2() searches which of
4115 * the given pixel formats should be used to suffer the least amount of loss.
4116 * The pixel formats from which it chooses one, are determined by the
4117 * pix_fmt_list parameter.
4120 * @param[in] pix_fmt_list AV_PIX_FMT_NONE terminated array of pixel formats to choose from
4121 * @param[in] src_pix_fmt source pixel format
4122 * @param[in] has_alpha Whether the source pixel format alpha channel is used.
4123 * @param[out] loss_ptr Combination of flags informing you what kind of losses will occur.
4124 * @return The best pixel format to convert to or -1 if none was found.
4126 enum AVPixelFormat avcodec_find_best_pix_fmt2(enum AVPixelFormat *pix_fmt_list,
4127 enum AVPixelFormat src_pix_fmt,
4128 int has_alpha, int *loss_ptr);
4130 enum AVPixelFormat avcodec_default_get_format(struct AVCodecContext *s, const enum AVPixelFormat * fmt);
4136 #if FF_API_SET_DIMENSIONS
4138 * @deprecated this function is not supposed to be used from outside of lavc
4140 attribute_deprecated
4141 void avcodec_set_dimensions(AVCodecContext *s, int width, int height);
4145 * Put a string representing the codec tag codec_tag in buf.
4147 * @param buf buffer to place codec tag in
4148 * @param buf_size size in bytes of buf
4149 * @param codec_tag codec tag to assign
4150 * @return the length of the string that would have been generated if
4151 * enough space had been available, excluding the trailing null
4153 size_t av_get_codec_tag_string(char *buf, size_t buf_size, unsigned int codec_tag);
4155 void avcodec_string(char *buf, int buf_size, AVCodecContext *enc, int encode);
4158 * Return a name for the specified profile, if available.
4160 * @param codec the codec that is searched for the given profile
4161 * @param profile the profile value for which a name is requested
4162 * @return A name for the profile if found, NULL otherwise.
4164 const char *av_get_profile_name(const AVCodec *codec, int profile);
4166 int avcodec_default_execute(AVCodecContext *c, int (*func)(AVCodecContext *c2, void *arg2),void *arg, int *ret, int count, int size);
4167 int avcodec_default_execute2(AVCodecContext *c, int (*func)(AVCodecContext *c2, void *arg2, int, int),void *arg, int *ret, int count);
4168 //FIXME func typedef
4171 * Fill audio frame data and linesize.
4172 * AVFrame extended_data channel pointers are allocated if necessary for
4175 * @param frame the AVFrame
4176 * frame->nb_samples must be set prior to calling the
4177 * function. This function fills in frame->data,
4178 * frame->extended_data, frame->linesize[0].
4179 * @param nb_channels channel count
4180 * @param sample_fmt sample format
4181 * @param buf buffer to use for frame data
4182 * @param buf_size size of buffer
4183 * @param align plane size sample alignment (0 = default)
4184 * @return 0 on success, negative error code on failure
4186 int avcodec_fill_audio_frame(AVFrame *frame, int nb_channels,
4187 enum AVSampleFormat sample_fmt, const uint8_t *buf,
4188 int buf_size, int align);
4191 * Reset the internal decoder state / flush internal buffers. Should be called
4192 * e.g. when seeking or when switching to a different stream.
4194 * @note when refcounted frames are not used (i.e. avctx->refcounted_frames is 0),
4195 * this invalidates the frames previously returned from the decoder. When
4196 * refcounted frames are used, the decoder just releases any references it might
4197 * keep internally, but the caller's reference remains valid.
4199 void avcodec_flush_buffers(AVCodecContext *avctx);
4202 * Return codec bits per sample.
4204 * @param[in] codec_id the codec
4205 * @return Number of bits per sample or zero if unknown for the given codec.
4207 int av_get_bits_per_sample(enum AVCodecID codec_id);
4210 * Return codec bits per sample.
4211 * Only return non-zero if the bits per sample is exactly correct, not an
4214 * @param[in] codec_id the codec
4215 * @return Number of bits per sample or zero if unknown for the given codec.
4217 int av_get_exact_bits_per_sample(enum AVCodecID codec_id);
4220 * Return audio frame duration.
4222 * @param avctx codec context
4223 * @param frame_bytes size of the frame, or 0 if unknown
4224 * @return frame duration, in samples, if known. 0 if not able to
4227 int av_get_audio_frame_duration(AVCodecContext *avctx, int frame_bytes);
4230 typedef struct AVBitStreamFilterContext {
4232 struct AVBitStreamFilter *filter;
4233 AVCodecParserContext *parser;
4234 struct AVBitStreamFilterContext *next;
4235 } AVBitStreamFilterContext;
4238 typedef struct AVBitStreamFilter {
4241 int (*filter)(AVBitStreamFilterContext *bsfc,
4242 AVCodecContext *avctx, const char *args,
4243 uint8_t **poutbuf, int *poutbuf_size,
4244 const uint8_t *buf, int buf_size, int keyframe);
4245 void (*close)(AVBitStreamFilterContext *bsfc);
4246 struct AVBitStreamFilter *next;
4247 } AVBitStreamFilter;
4249 void av_register_bitstream_filter(AVBitStreamFilter *bsf);
4250 AVBitStreamFilterContext *av_bitstream_filter_init(const char *name);
4251 int av_bitstream_filter_filter(AVBitStreamFilterContext *bsfc,
4252 AVCodecContext *avctx, const char *args,
4253 uint8_t **poutbuf, int *poutbuf_size,
4254 const uint8_t *buf, int buf_size, int keyframe);
4255 void av_bitstream_filter_close(AVBitStreamFilterContext *bsf);
4257 AVBitStreamFilter *av_bitstream_filter_next(AVBitStreamFilter *f);
4262 * Allocate a buffer with padding, reusing the given one if large enough.
4264 * Same behaviour av_fast_malloc but the buffer has additional
4265 * FF_INPUT_PADDING_SIZE at the end which will always memset to 0.
4268 void av_fast_padded_malloc(void *ptr, unsigned int *size, size_t min_size);
4271 * Encode extradata length to a buffer. Used by xiph codecs.
4273 * @param s buffer to write to; must be at least (v/255+1) bytes long
4274 * @param v size of extradata in bytes
4275 * @return number of bytes written to the buffer.
4277 unsigned int av_xiphlacing(unsigned char *s, unsigned int v);
4279 #if FF_API_MISSING_SAMPLE
4281 * Log a generic warning message about a missing feature. This function is
4282 * intended to be used internally by Libav (libavcodec, libavformat, etc.)
4283 * only, and would normally not be used by applications.
4284 * @param[in] avc a pointer to an arbitrary struct of which the first field is
4285 * a pointer to an AVClass struct
4286 * @param[in] feature string containing the name of the missing feature
4287 * @param[in] want_sample indicates if samples are wanted which exhibit this feature.
4288 * If want_sample is non-zero, additional verbage will be added to the log
4289 * message which tells the user how to report samples to the development
4291 * @deprecated Use avpriv_report_missing_feature() instead.
4293 attribute_deprecated
4294 void av_log_missing_feature(void *avc, const char *feature, int want_sample);
4297 * Log a generic warning message asking for a sample. This function is
4298 * intended to be used internally by Libav (libavcodec, libavformat, etc.)
4299 * only, and would normally not be used by applications.
4300 * @param[in] avc a pointer to an arbitrary struct of which the first field is
4301 * a pointer to an AVClass struct
4302 * @param[in] msg string containing an optional message, or NULL if no message
4303 * @deprecated Use avpriv_request_sample() instead.
4305 attribute_deprecated
4306 void av_log_ask_for_sample(void *avc, const char *msg, ...) av_printf_format(2, 3);
4307 #endif /* FF_API_MISSING_SAMPLE */
4310 * Register the hardware accelerator hwaccel.
4312 void av_register_hwaccel(AVHWAccel *hwaccel);
4315 * If hwaccel is NULL, returns the first registered hardware accelerator,
4316 * if hwaccel is non-NULL, returns the next registered hardware accelerator
4317 * after hwaccel, or NULL if hwaccel is the last one.
4319 AVHWAccel *av_hwaccel_next(AVHWAccel *hwaccel);
4323 * Lock operation used by lockmgr
4326 AV_LOCK_CREATE, ///< Create a mutex
4327 AV_LOCK_OBTAIN, ///< Lock the mutex
4328 AV_LOCK_RELEASE, ///< Unlock the mutex
4329 AV_LOCK_DESTROY, ///< Free mutex resources
4333 * Register a user provided lock manager supporting the operations
4334 * specified by AVLockOp. mutex points to a (void *) where the
4335 * lockmgr should store/get a pointer to a user allocated mutex. It's
4336 * NULL upon AV_LOCK_CREATE and != NULL for all other ops.
4338 * @param cb User defined callback. Note: Libav may invoke calls to this
4339 * callback during the call to av_lockmgr_register().
4340 * Thus, the application must be prepared to handle that.
4341 * If cb is set to NULL the lockmgr will be unregistered.
4342 * Also note that during unregistration the previously registered
4343 * lockmgr callback may also be invoked.
4345 int av_lockmgr_register(int (*cb)(void **mutex, enum AVLockOp op));
4348 * Get the type of the given codec.
4350 enum AVMediaType avcodec_get_type(enum AVCodecID codec_id);
4353 * @return a positive value if s is open (i.e. avcodec_open2() was called on it
4354 * with no corresponding avcodec_close()), 0 otherwise.
4356 int avcodec_is_open(AVCodecContext *s);
4359 * @return a non-zero number if codec is an encoder, zero otherwise
4361 int av_codec_is_encoder(const AVCodec *codec);
4364 * @return a non-zero number if codec is a decoder, zero otherwise
4366 int av_codec_is_decoder(const AVCodec *codec);
4369 * @return descriptor for given codec ID or NULL if no descriptor exists.
4371 const AVCodecDescriptor *avcodec_descriptor_get(enum AVCodecID id);
4374 * Iterate over all codec descriptors known to libavcodec.
4376 * @param prev previous descriptor. NULL to get the first descriptor.
4378 * @return next descriptor or NULL after the last descriptor
4380 const AVCodecDescriptor *avcodec_descriptor_next(const AVCodecDescriptor *prev);
4383 * @return codec descriptor with the given name or NULL if no such descriptor
4386 const AVCodecDescriptor *avcodec_descriptor_get_by_name(const char *name);
4392 #endif /* AVCODEC_AVCODEC_H */