2 * copyright (c) 2001 Fabrice Bellard
4 * This file is part of FFmpeg.
6 * FFmpeg is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
11 * FFmpeg is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with FFmpeg; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21 #ifndef AVCODEC_AVCODEC_H
22 #define AVCODEC_AVCODEC_H
27 * Libavcodec external API header
31 #include "libavutil/samplefmt.h"
32 #include "libavutil/attributes.h"
33 #include "libavutil/avutil.h"
34 #include "libavutil/buffer.h"
35 #include "libavutil/cpu.h"
36 #include "libavutil/channel_layout.h"
37 #include "libavutil/dict.h"
38 #include "libavutil/frame.h"
39 #include "libavutil/hwcontext.h"
40 #include "libavutil/log.h"
41 #include "libavutil/pixfmt.h"
42 #include "libavutil/rational.h"
47 * @defgroup libavc libavcodec
48 * Encoding/Decoding Library
52 * @defgroup lavc_decoding Decoding
56 * @defgroup lavc_encoding Encoding
60 * @defgroup lavc_codec Codecs
62 * @defgroup lavc_codec_native Native Codecs
65 * @defgroup lavc_codec_wrappers External library wrappers
68 * @defgroup lavc_codec_hwaccel Hardware Accelerators bridge
72 * @defgroup lavc_internal Internal
80 * @defgroup lavc_encdec send/receive encoding and decoding API overview
83 * The avcodec_send_packet()/avcodec_receive_frame()/avcodec_send_frame()/
84 * avcodec_receive_packet() functions provide an encode/decode API, which
85 * decouples input and output.
87 * The API is very similar for encoding/decoding and audio/video, and works as
89 * - Set up and open the AVCodecContext as usual.
91 * - For decoding, call avcodec_send_packet() to give the decoder raw
92 * compressed data in an AVPacket.
93 * - For encoding, call avcodec_send_frame() to give the encoder an AVFrame
94 * containing uncompressed audio or video.
95 * In both cases, it is recommended that AVPackets and AVFrames are
96 * refcounted, or libavcodec might have to copy the input data. (libavformat
97 * always returns refcounted AVPackets, and av_frame_get_buffer() allocates
98 * refcounted AVFrames.)
99 * - Receive output in a loop. Periodically call one of the avcodec_receive_*()
100 * functions and process their output:
101 * - For decoding, call avcodec_receive_frame(). On success, it will return
102 * an AVFrame containing uncompressed audio or video data.
103 * - For encoding, call avcodec_receive_packet(). On success, it will return
104 * an AVPacket with a compressed frame.
105 * Repeat this call until it returns AVERROR(EAGAIN) or an error. The
106 * AVERROR(EAGAIN) return value means that new input data is required to
107 * return new output. In this case, continue with sending input. For each
108 * input frame/packet, the codec will typically return 1 output frame/packet,
109 * but it can also be 0 or more than 1.
111 * At the beginning of decoding or encoding, the codec might accept multiple
112 * input frames/packets without returning a frame, until its internal buffers
113 * are filled. This situation is handled transparently if you follow the steps
116 * In theory, sending input can result in EAGAIN - this should happen only if
117 * not all output was received. You can use this to structure alternative decode
118 * or encode loops other than the one suggested above. For example, you could
119 * try sending new input on each iteration, and try to receive output if that
122 * End of stream situations. These require "flushing" (aka draining) the codec,
123 * as the codec might buffer multiple frames or packets internally for
124 * performance or out of necessity (consider B-frames).
125 * This is handled as follows:
126 * - Instead of valid input, send NULL to the avcodec_send_packet() (decoding)
127 * or avcodec_send_frame() (encoding) functions. This will enter draining
129 * - Call avcodec_receive_frame() (decoding) or avcodec_receive_packet()
130 * (encoding) in a loop until AVERROR_EOF is returned. The functions will
131 * not return AVERROR(EAGAIN), unless you forgot to enter draining mode.
132 * - Before decoding can be resumed again, the codec has to be reset with
133 * avcodec_flush_buffers().
135 * Using the API as outlined above is highly recommended. But it is also
136 * possible to call functions outside of this rigid schema. For example, you can
137 * call avcodec_send_packet() repeatedly without calling
138 * avcodec_receive_frame(). In this case, avcodec_send_packet() will succeed
139 * until the codec's internal buffer has been filled up (which is typically of
140 * size 1 per output frame, after initial input), and then reject input with
141 * AVERROR(EAGAIN). Once it starts rejecting input, you have no choice but to
142 * read at least some output.
144 * Not all codecs will follow a rigid and predictable dataflow; the only
145 * guarantee is that an AVERROR(EAGAIN) return value on a send/receive call on
146 * one end implies that a receive/send call on the other end will succeed, or
147 * at least will not fail with AVERROR(EAGAIN). In general, no codec will
148 * permit unlimited buffering of input or output.
150 * This API replaces the following legacy functions:
151 * - avcodec_decode_video2() and avcodec_decode_audio4():
152 * Use avcodec_send_packet() to feed input to the decoder, then use
153 * avcodec_receive_frame() to receive decoded frames after each packet.
154 * Unlike with the old video decoding API, multiple frames might result from
155 * a packet. For audio, splitting the input packet into frames by partially
156 * decoding packets becomes transparent to the API user. You never need to
157 * feed an AVPacket to the API twice (unless it is rejected with AVERROR(EAGAIN) - then
158 * no data was read from the packet).
159 * Additionally, sending a flush/draining packet is required only once.
160 * - avcodec_encode_video2()/avcodec_encode_audio2():
161 * Use avcodec_send_frame() to feed input to the encoder, then use
162 * avcodec_receive_packet() to receive encoded packets.
163 * Providing user-allocated buffers for avcodec_receive_packet() is not
165 * - The new API does not handle subtitles yet.
167 * Mixing new and old function calls on the same AVCodecContext is not allowed,
168 * and will result in undefined behavior.
170 * Some codecs might require using the new API; using the old API will return
171 * an error when calling it. All codecs support the new API.
173 * A codec is not allowed to return AVERROR(EAGAIN) for both sending and receiving. This
174 * would be an invalid state, which could put the codec user into an endless
175 * loop. The API has no concept of time either: it cannot happen that trying to
176 * do avcodec_send_packet() results in AVERROR(EAGAIN), but a repeated call 1 second
177 * later accepts the packet (with no other receive/flush API calls involved).
178 * The API is a strict state machine, and the passage of time is not supposed
179 * to influence it. Some timing-dependent behavior might still be deemed
180 * acceptable in certain cases. But it must never result in both send/receive
181 * returning EAGAIN at the same time at any point. It must also absolutely be
182 * avoided that the current state is "unstable" and can "flip-flop" between
183 * the send/receive APIs allowing progress. For example, it's not allowed that
184 * the codec randomly decides that it actually wants to consume a packet now
185 * instead of returning a frame, after it just returned AVERROR(EAGAIN) on an
186 * avcodec_send_packet() call.
191 * @defgroup lavc_core Core functions/structures.
194 * Basic definitions, functions for querying libavcodec capabilities,
195 * allocating core structures, etc.
201 * Identify the syntax and semantics of the bitstream.
202 * The principle is roughly:
203 * Two decoders with the same ID can decode the same streams.
204 * Two encoders with the same ID can encode compatible streams.
205 * There may be slight deviations from the principle due to implementation
208 * If you add a codec ID to this list, add it so that
209 * 1. no value of an existing codec ID changes (that would break ABI),
210 * 2. it is as close as possible to similar codecs
212 * After adding new codec IDs, do not forget to add an entry to the codec
213 * descriptor list and bump libavcodec minor version.
219 AV_CODEC_ID_MPEG1VIDEO,
220 AV_CODEC_ID_MPEG2VIDEO, ///< preferred ID for MPEG-1/2 video decoding
231 AV_CODEC_ID_RAWVIDEO,
232 AV_CODEC_ID_MSMPEG4V1,
233 AV_CODEC_ID_MSMPEG4V2,
234 AV_CODEC_ID_MSMPEG4V3,
257 AV_CODEC_ID_INTERPLAY_VIDEO,
264 AV_CODEC_ID_MSVIDEO1,
269 AV_CODEC_ID_TRUEMOTION1,
270 AV_CODEC_ID_VMDVIDEO,
295 AV_CODEC_ID_TRUEMOTION2,
301 AV_CODEC_ID_SMACKVIDEO,
306 AV_CODEC_ID_JPEG2000,
312 AV_CODEC_ID_DSICINVIDEO,
313 AV_CODEC_ID_TIERTEXSEQVIDEO,
321 AV_CODEC_ID_BETHSOFTVID,
333 AV_CODEC_ID_ESCAPE124,
337 AV_CODEC_ID_MOTIONPIXELS,
349 AV_CODEC_ID_FLASHSV2,
350 AV_CODEC_ID_CDGRAPHICS,
353 AV_CODEC_ID_BINKVIDEO,
354 AV_CODEC_ID_IFF_ILBM,
355 #define AV_CODEC_ID_IFF_BYTERUN1 AV_CODEC_ID_IFF_ILBM
361 AV_CODEC_ID_A64_MULTI,
362 AV_CODEC_ID_A64_MULTI5,
365 AV_CODEC_ID_LAGARITH,
369 AV_CODEC_ID_WMV3IMAGE,
370 AV_CODEC_ID_VC1IMAGE,
372 AV_CODEC_ID_BMV_VIDEO,
379 AV_CODEC_ID_ZEROCODEC,
388 AV_CODEC_ID_ESCAPE130,
391 AV_CODEC_ID_HNM4_VIDEO,
393 #define AV_CODEC_ID_H265 AV_CODEC_ID_HEVC
395 AV_CODEC_ID_ALIAS_PIX,
396 AV_CODEC_ID_BRENDER_PIX,
397 AV_CODEC_ID_PAF_VIDEO,
410 AV_CODEC_ID_SCREENPRESSO,
414 AV_CODEC_ID_Y41P = 0x8000,
419 AV_CODEC_ID_TARGA_Y216,
431 AV_CODEC_ID_TRUEMOTION2RT,
433 AV_CODEC_ID_MAGICYUV,
434 AV_CODEC_ID_SHEERVIDEO,
441 AV_CODEC_ID_CLEARVIDEO,
444 AV_CODEC_ID_BITPACKED,
451 AV_CODEC_ID_PROSUMER,
465 /* various PCM "codecs" */
466 AV_CODEC_ID_FIRST_AUDIO = 0x10000, ///< A dummy id pointing at the start of audio codecs
467 AV_CODEC_ID_PCM_S16LE = 0x10000,
468 AV_CODEC_ID_PCM_S16BE,
469 AV_CODEC_ID_PCM_U16LE,
470 AV_CODEC_ID_PCM_U16BE,
473 AV_CODEC_ID_PCM_MULAW,
474 AV_CODEC_ID_PCM_ALAW,
475 AV_CODEC_ID_PCM_S32LE,
476 AV_CODEC_ID_PCM_S32BE,
477 AV_CODEC_ID_PCM_U32LE,
478 AV_CODEC_ID_PCM_U32BE,
479 AV_CODEC_ID_PCM_S24LE,
480 AV_CODEC_ID_PCM_S24BE,
481 AV_CODEC_ID_PCM_U24LE,
482 AV_CODEC_ID_PCM_U24BE,
483 AV_CODEC_ID_PCM_S24DAUD,
484 AV_CODEC_ID_PCM_ZORK,
485 AV_CODEC_ID_PCM_S16LE_PLANAR,
487 AV_CODEC_ID_PCM_F32BE,
488 AV_CODEC_ID_PCM_F32LE,
489 AV_CODEC_ID_PCM_F64BE,
490 AV_CODEC_ID_PCM_F64LE,
491 AV_CODEC_ID_PCM_BLURAY,
494 AV_CODEC_ID_PCM_S8_PLANAR,
495 AV_CODEC_ID_PCM_S24LE_PLANAR,
496 AV_CODEC_ID_PCM_S32LE_PLANAR,
497 AV_CODEC_ID_PCM_S16BE_PLANAR,
499 AV_CODEC_ID_PCM_S64LE = 0x10800,
500 AV_CODEC_ID_PCM_S64BE,
501 AV_CODEC_ID_PCM_F16LE,
502 AV_CODEC_ID_PCM_F24LE,
503 AV_CODEC_ID_PCM_VIDC,
505 /* various ADPCM codecs */
506 AV_CODEC_ID_ADPCM_IMA_QT = 0x11000,
507 AV_CODEC_ID_ADPCM_IMA_WAV,
508 AV_CODEC_ID_ADPCM_IMA_DK3,
509 AV_CODEC_ID_ADPCM_IMA_DK4,
510 AV_CODEC_ID_ADPCM_IMA_WS,
511 AV_CODEC_ID_ADPCM_IMA_SMJPEG,
512 AV_CODEC_ID_ADPCM_MS,
513 AV_CODEC_ID_ADPCM_4XM,
514 AV_CODEC_ID_ADPCM_XA,
515 AV_CODEC_ID_ADPCM_ADX,
516 AV_CODEC_ID_ADPCM_EA,
517 AV_CODEC_ID_ADPCM_G726,
518 AV_CODEC_ID_ADPCM_CT,
519 AV_CODEC_ID_ADPCM_SWF,
520 AV_CODEC_ID_ADPCM_YAMAHA,
521 AV_CODEC_ID_ADPCM_SBPRO_4,
522 AV_CODEC_ID_ADPCM_SBPRO_3,
523 AV_CODEC_ID_ADPCM_SBPRO_2,
524 AV_CODEC_ID_ADPCM_THP,
525 AV_CODEC_ID_ADPCM_IMA_AMV,
526 AV_CODEC_ID_ADPCM_EA_R1,
527 AV_CODEC_ID_ADPCM_EA_R3,
528 AV_CODEC_ID_ADPCM_EA_R2,
529 AV_CODEC_ID_ADPCM_IMA_EA_SEAD,
530 AV_CODEC_ID_ADPCM_IMA_EA_EACS,
531 AV_CODEC_ID_ADPCM_EA_XAS,
532 AV_CODEC_ID_ADPCM_EA_MAXIS_XA,
533 AV_CODEC_ID_ADPCM_IMA_ISS,
534 AV_CODEC_ID_ADPCM_G722,
535 AV_CODEC_ID_ADPCM_IMA_APC,
536 AV_CODEC_ID_ADPCM_VIMA,
538 AV_CODEC_ID_ADPCM_AFC = 0x11800,
539 AV_CODEC_ID_ADPCM_IMA_OKI,
540 AV_CODEC_ID_ADPCM_DTK,
541 AV_CODEC_ID_ADPCM_IMA_RAD,
542 AV_CODEC_ID_ADPCM_G726LE,
543 AV_CODEC_ID_ADPCM_THP_LE,
544 AV_CODEC_ID_ADPCM_PSX,
545 AV_CODEC_ID_ADPCM_AICA,
546 AV_CODEC_ID_ADPCM_IMA_DAT4,
547 AV_CODEC_ID_ADPCM_MTAF,
548 AV_CODEC_ID_ADPCM_AGM,
549 AV_CODEC_ID_ADPCM_ARGO,
550 AV_CODEC_ID_ADPCM_IMA_SSI,
551 AV_CODEC_ID_ADPCM_ZORK,
552 AV_CODEC_ID_ADPCM_IMA_APM,
555 AV_CODEC_ID_AMR_NB = 0x12000,
558 /* RealAudio codecs*/
559 AV_CODEC_ID_RA_144 = 0x13000,
562 /* various DPCM codecs */
563 AV_CODEC_ID_ROQ_DPCM = 0x14000,
564 AV_CODEC_ID_INTERPLAY_DPCM,
565 AV_CODEC_ID_XAN_DPCM,
566 AV_CODEC_ID_SOL_DPCM,
568 AV_CODEC_ID_SDX2_DPCM = 0x14800,
569 AV_CODEC_ID_GREMLIN_DPCM,
572 AV_CODEC_ID_MP2 = 0x15000,
573 AV_CODEC_ID_MP3, ///< preferred ID for decoding MPEG audio layer 1, 2 or 3
583 AV_CODEC_ID_VMDAUDIO,
589 AV_CODEC_ID_WESTWOOD_SND1,
590 AV_CODEC_ID_GSM, ///< as in Berlin toast format
593 AV_CODEC_ID_TRUESPEECH,
595 AV_CODEC_ID_SMACKAUDIO,
598 AV_CODEC_ID_DSICINAUDIO,
600 AV_CODEC_ID_MUSEPACK7,
602 AV_CODEC_ID_GSM_MS, /* as found in WAV */
605 AV_CODEC_ID_NELLYMOSER,
606 AV_CODEC_ID_MUSEPACK8,
608 AV_CODEC_ID_WMAVOICE,
610 AV_CODEC_ID_WMALOSSLESS,
619 AV_CODEC_ID_BINKAUDIO_RDFT,
620 AV_CODEC_ID_BINKAUDIO_DCT,
621 AV_CODEC_ID_AAC_LATM,
626 AV_CODEC_ID_8SVX_EXP,
627 AV_CODEC_ID_8SVX_FIB,
628 AV_CODEC_ID_BMV_AUDIO,
633 AV_CODEC_ID_COMFORT_NOISE,
635 AV_CODEC_ID_METASOUND,
636 AV_CODEC_ID_PAF_AUDIO,
641 AV_CODEC_ID_FFWAVESYNTH = 0x15800,
643 AV_CODEC_ID_SONIC_LS,
646 AV_CODEC_ID_DSD_LSBF,
647 AV_CODEC_ID_DSD_MSBF,
648 AV_CODEC_ID_DSD_LSBF_PLANAR,
649 AV_CODEC_ID_DSD_MSBF_PLANAR,
651 AV_CODEC_ID_INTERPLAY_ACM,
655 AV_CODEC_ID_ATRAC3AL,
656 AV_CODEC_ID_ATRAC3PAL,
663 AV_CODEC_ID_ACELP_KELVIN,
664 AV_CODEC_ID_MPEGH_3D_AUDIO,
667 /* subtitle codecs */
668 AV_CODEC_ID_FIRST_SUBTITLE = 0x17000, ///< A dummy ID pointing at the start of subtitle codecs.
669 AV_CODEC_ID_DVD_SUBTITLE = 0x17000,
670 AV_CODEC_ID_DVB_SUBTITLE,
671 AV_CODEC_ID_TEXT, ///< raw UTF-8 text
674 AV_CODEC_ID_MOV_TEXT,
675 AV_CODEC_ID_HDMV_PGS_SUBTITLE,
676 AV_CODEC_ID_DVB_TELETEXT,
679 AV_CODEC_ID_MICRODVD = 0x17800,
683 AV_CODEC_ID_REALTEXT,
685 AV_CODEC_ID_SUBVIEWER1,
686 AV_CODEC_ID_SUBVIEWER,
693 AV_CODEC_ID_HDMV_TEXT_SUBTITLE,
695 AV_CODEC_ID_ARIB_CAPTION,
697 /* other specific kind of codecs (generally used for attachments) */
698 AV_CODEC_ID_FIRST_UNKNOWN = 0x18000, ///< A dummy ID pointing at the start of various fake codecs.
699 AV_CODEC_ID_TTF = 0x18000,
701 AV_CODEC_ID_SCTE_35, ///< Contain timestamp estimated through PCR of program stream.
703 AV_CODEC_ID_BINTEXT = 0x18800,
707 AV_CODEC_ID_SMPTE_KLV,
709 AV_CODEC_ID_TIMED_ID3,
710 AV_CODEC_ID_BIN_DATA,
713 AV_CODEC_ID_PROBE = 0x19000, ///< codec_id is not known (like AV_CODEC_ID_NONE) but lavf should attempt to identify it
715 AV_CODEC_ID_MPEG2TS = 0x20000, /**< _FAKE_ codec to indicate a raw MPEG-2 TS
716 * stream (only used by libavformat) */
717 AV_CODEC_ID_MPEG4SYSTEMS = 0x20001, /**< _FAKE_ codec to indicate a MPEG-4 Systems
718 * stream (only used by libavformat) */
719 AV_CODEC_ID_FFMETADATA = 0x21000, ///< Dummy codec for streams containing only metadata information.
720 AV_CODEC_ID_WRAPPED_AVFRAME = 0x21001, ///< Passthrough codec, AVFrames wrapped in AVPacket
724 * This struct describes the properties of a single codec described by an
726 * @see avcodec_descriptor_get()
728 typedef struct AVCodecDescriptor {
730 enum AVMediaType type;
732 * Name of the codec described by this descriptor. It is non-empty and
733 * unique for each codec descriptor. It should contain alphanumeric
734 * characters and '_' only.
738 * A more descriptive name for this codec. May be NULL.
740 const char *long_name;
742 * Codec properties, a combination of AV_CODEC_PROP_* flags.
746 * MIME type(s) associated with the codec.
747 * May be NULL; if not, a NULL-terminated array of MIME types.
748 * The first item is always non-NULL and is the preferred MIME type.
750 const char *const *mime_types;
752 * If non-NULL, an array of profiles recognized for this codec.
753 * Terminated with FF_PROFILE_UNKNOWN.
755 const struct AVProfile *profiles;
759 * Codec uses only intra compression.
760 * Video and audio codecs only.
762 #define AV_CODEC_PROP_INTRA_ONLY (1 << 0)
764 * Codec supports lossy compression. Audio and video codecs only.
765 * @note a codec may support both lossy and lossless
768 #define AV_CODEC_PROP_LOSSY (1 << 1)
770 * Codec supports lossless compression. Audio and video codecs only.
772 #define AV_CODEC_PROP_LOSSLESS (1 << 2)
774 * Codec supports frame reordering. That is, the coded order (the order in which
775 * the encoded packets are output by the encoders / stored / input to the
776 * decoders) may be different from the presentation order of the corresponding
779 * For codecs that do not have this property set, PTS and DTS should always be
782 #define AV_CODEC_PROP_REORDER (1 << 3)
784 * Subtitle codec is bitmap based
785 * Decoded AVSubtitle data can be read from the AVSubtitleRect->pict field.
787 #define AV_CODEC_PROP_BITMAP_SUB (1 << 16)
789 * Subtitle codec is text based.
790 * Decoded AVSubtitle data can be read from the AVSubtitleRect->ass field.
792 #define AV_CODEC_PROP_TEXT_SUB (1 << 17)
795 * @ingroup lavc_decoding
796 * Required number of additionally allocated bytes at the end of the input bitstream for decoding.
797 * This is mainly needed because some optimized bitstream readers read
798 * 32 or 64 bit at once and could read over the end.<br>
799 * Note: If the first 23 bits of the additional bytes are not 0, then damaged
800 * MPEG bitstreams could cause overread and segfault.
802 #define AV_INPUT_BUFFER_PADDING_SIZE 64
805 * @ingroup lavc_encoding
806 * minimum encoding buffer size
807 * Used to avoid some checks during header writing.
809 #define AV_INPUT_BUFFER_MIN_SIZE 16384
812 * @ingroup lavc_decoding
815 /* We leave some space between them for extensions (drop some
816 * keyframes for intra-only or drop just some bidir frames). */
817 AVDISCARD_NONE =-16, ///< discard nothing
818 AVDISCARD_DEFAULT = 0, ///< discard useless packets like 0 size packets in avi
819 AVDISCARD_NONREF = 8, ///< discard all non reference
820 AVDISCARD_BIDIR = 16, ///< discard all bidirectional frames
821 AVDISCARD_NONINTRA= 24, ///< discard all non intra frames
822 AVDISCARD_NONKEY = 32, ///< discard all frames except keyframes
823 AVDISCARD_ALL = 48, ///< discard all
826 enum AVAudioServiceType {
827 AV_AUDIO_SERVICE_TYPE_MAIN = 0,
828 AV_AUDIO_SERVICE_TYPE_EFFECTS = 1,
829 AV_AUDIO_SERVICE_TYPE_VISUALLY_IMPAIRED = 2,
830 AV_AUDIO_SERVICE_TYPE_HEARING_IMPAIRED = 3,
831 AV_AUDIO_SERVICE_TYPE_DIALOGUE = 4,
832 AV_AUDIO_SERVICE_TYPE_COMMENTARY = 5,
833 AV_AUDIO_SERVICE_TYPE_EMERGENCY = 6,
834 AV_AUDIO_SERVICE_TYPE_VOICE_OVER = 7,
835 AV_AUDIO_SERVICE_TYPE_KARAOKE = 8,
836 AV_AUDIO_SERVICE_TYPE_NB , ///< Not part of ABI
840 * @ingroup lavc_encoding
842 typedef struct RcOverride{
845 int qscale; // If this is 0 then quality_factor will be used instead.
846 float quality_factor;
850 These flags can be passed in AVCodecContext.flags before initialization.
851 Note: Not everything is supported yet.
855 * Allow decoders to produce frames with data planes that are not aligned
856 * to CPU requirements (e.g. due to cropping).
858 #define AV_CODEC_FLAG_UNALIGNED (1 << 0)
862 #define AV_CODEC_FLAG_QSCALE (1 << 1)
864 * 4 MV per MB allowed / advanced prediction for H.263.
866 #define AV_CODEC_FLAG_4MV (1 << 2)
868 * Output even those frames that might be corrupted.
870 #define AV_CODEC_FLAG_OUTPUT_CORRUPT (1 << 3)
874 #define AV_CODEC_FLAG_QPEL (1 << 4)
876 * Don't output frames whose parameters differ from first
877 * decoded frame in stream.
879 #define AV_CODEC_FLAG_DROPCHANGED (1 << 5)
881 * Use internal 2pass ratecontrol in first pass mode.
883 #define AV_CODEC_FLAG_PASS1 (1 << 9)
885 * Use internal 2pass ratecontrol in second pass mode.
887 #define AV_CODEC_FLAG_PASS2 (1 << 10)
891 #define AV_CODEC_FLAG_LOOP_FILTER (1 << 11)
893 * Only decode/encode grayscale.
895 #define AV_CODEC_FLAG_GRAY (1 << 13)
897 * error[?] variables will be set during encoding.
899 #define AV_CODEC_FLAG_PSNR (1 << 15)
901 * Input bitstream might be truncated at a random location
902 * instead of only at frame boundaries.
904 #define AV_CODEC_FLAG_TRUNCATED (1 << 16)
906 * Use interlaced DCT.
908 #define AV_CODEC_FLAG_INTERLACED_DCT (1 << 18)
912 #define AV_CODEC_FLAG_LOW_DELAY (1 << 19)
914 * Place global headers in extradata instead of every keyframe.
916 #define AV_CODEC_FLAG_GLOBAL_HEADER (1 << 22)
918 * Use only bitexact stuff (except (I)DCT).
920 #define AV_CODEC_FLAG_BITEXACT (1 << 23)
921 /* Fx : Flag for H.263+ extra options */
923 * H.263 advanced intra coding / MPEG-4 AC prediction
925 #define AV_CODEC_FLAG_AC_PRED (1 << 24)
927 * interlaced motion estimation
929 #define AV_CODEC_FLAG_INTERLACED_ME (1 << 29)
930 #define AV_CODEC_FLAG_CLOSED_GOP (1U << 31)
933 * Allow non spec compliant speedup tricks.
935 #define AV_CODEC_FLAG2_FAST (1 << 0)
937 * Skip bitstream encoding.
939 #define AV_CODEC_FLAG2_NO_OUTPUT (1 << 2)
941 * Place global headers at every keyframe instead of in extradata.
943 #define AV_CODEC_FLAG2_LOCAL_HEADER (1 << 3)
946 * timecode is in drop frame format. DEPRECATED!!!!
948 #define AV_CODEC_FLAG2_DROP_FRAME_TIMECODE (1 << 13)
951 * Input bitstream might be truncated at a packet boundaries
952 * instead of only at frame boundaries.
954 #define AV_CODEC_FLAG2_CHUNKS (1 << 15)
956 * Discard cropping information from SPS.
958 #define AV_CODEC_FLAG2_IGNORE_CROP (1 << 16)
961 * Show all frames before the first keyframe
963 #define AV_CODEC_FLAG2_SHOW_ALL (1 << 22)
965 * Export motion vectors through frame side data
967 #define AV_CODEC_FLAG2_EXPORT_MVS (1 << 28)
969 * Do not skip samples and export skip information as frame side data
971 #define AV_CODEC_FLAG2_SKIP_MANUAL (1 << 29)
973 * Do not reset ASS ReadOrder field on flush (subtitles decoding)
975 #define AV_CODEC_FLAG2_RO_FLUSH_NOOP (1 << 30)
977 /* Unsupported options :
978 * Syntax Arithmetic coding (SAC)
979 * Reference Picture Selection
980 * Independent Segment Decoding */
982 /* codec capabilities */
985 * Decoder can use draw_horiz_band callback.
987 #define AV_CODEC_CAP_DRAW_HORIZ_BAND (1 << 0)
989 * Codec uses get_buffer() for allocating buffers and supports custom allocators.
990 * If not set, it might not use get_buffer() at all or use operations that
991 * assume the buffer was allocated by avcodec_default_get_buffer.
993 #define AV_CODEC_CAP_DR1 (1 << 1)
994 #define AV_CODEC_CAP_TRUNCATED (1 << 3)
996 * Encoder or decoder requires flushing with NULL input at the end in order to
997 * give the complete and correct output.
999 * NOTE: If this flag is not set, the codec is guaranteed to never be fed with
1000 * with NULL data. The user can still send NULL data to the public encode
1001 * or decode function, but libavcodec will not pass it along to the codec
1002 * unless this flag is set.
1005 * The decoder has a non-zero delay and needs to be fed with avpkt->data=NULL,
1006 * avpkt->size=0 at the end to get the delayed data until the decoder no longer
1010 * The encoder needs to be fed with NULL data at the end of encoding until the
1011 * encoder no longer returns data.
1013 * NOTE: For encoders implementing the AVCodec.encode2() function, setting this
1014 * flag also means that the encoder must set the pts and duration for
1015 * each output packet. If this flag is not set, the pts and duration will
1016 * be determined by libavcodec from the input frame.
1018 #define AV_CODEC_CAP_DELAY (1 << 5)
1020 * Codec can be fed a final frame with a smaller size.
1021 * This can be used to prevent truncation of the last audio samples.
1023 #define AV_CODEC_CAP_SMALL_LAST_FRAME (1 << 6)
1026 * Codec can output multiple frames per AVPacket
1027 * Normally demuxers return one frame at a time, demuxers which do not do
1028 * are connected to a parser to split what they return into proper frames.
1029 * This flag is reserved to the very rare category of codecs which have a
1030 * bitstream that cannot be split into frames without timeconsuming
1031 * operations like full decoding. Demuxers carrying such bitstreams thus
1032 * may return multiple frames in a packet. This has many disadvantages like
1033 * prohibiting stream copy in many cases thus it should only be considered
1036 #define AV_CODEC_CAP_SUBFRAMES (1 << 8)
1038 * Codec is experimental and is thus avoided in favor of non experimental
1041 #define AV_CODEC_CAP_EXPERIMENTAL (1 << 9)
1043 * Codec should fill in channel configuration and samplerate instead of container
1045 #define AV_CODEC_CAP_CHANNEL_CONF (1 << 10)
1047 * Codec supports frame-level multithreading.
1049 #define AV_CODEC_CAP_FRAME_THREADS (1 << 12)
1051 * Codec supports slice-based (or partition-based) multithreading.
1053 #define AV_CODEC_CAP_SLICE_THREADS (1 << 13)
1055 * Codec supports changed parameters at any point.
1057 #define AV_CODEC_CAP_PARAM_CHANGE (1 << 14)
1059 * Codec supports avctx->thread_count == 0 (auto).
1061 #define AV_CODEC_CAP_AUTO_THREADS (1 << 15)
1063 * Audio encoder supports receiving a different number of samples in each call.
1065 #define AV_CODEC_CAP_VARIABLE_FRAME_SIZE (1 << 16)
1067 * Decoder is not a preferred choice for probing.
1068 * This indicates that the decoder is not a good choice for probing.
1069 * It could for example be an expensive to spin up hardware decoder,
1070 * or it could simply not provide a lot of useful information about
1072 * A decoder marked with this flag should only be used as last resort
1073 * choice for probing.
1075 #define AV_CODEC_CAP_AVOID_PROBING (1 << 17)
1077 * Codec is intra only.
1079 #define AV_CODEC_CAP_INTRA_ONLY 0x40000000
1081 * Codec is lossless.
1083 #define AV_CODEC_CAP_LOSSLESS 0x80000000
1086 * Codec is backed by a hardware implementation. Typically used to
1087 * identify a non-hwaccel hardware decoder. For information about hwaccels, use
1088 * avcodec_get_hw_config() instead.
1090 #define AV_CODEC_CAP_HARDWARE (1 << 18)
1093 * Codec is potentially backed by a hardware implementation, but not
1094 * necessarily. This is used instead of AV_CODEC_CAP_HARDWARE, if the
1095 * implementation provides some sort of internal fallback.
1097 #define AV_CODEC_CAP_HYBRID (1 << 19)
1100 * This codec takes the reordered_opaque field from input AVFrames
1101 * and returns it in the corresponding field in AVCodecContext after
1104 #define AV_CODEC_CAP_ENCODER_REORDERED_OPAQUE (1 << 20)
1106 /* Exported side data.
1107 These flags can be passed in AVCodecContext.export_side_data before initialization.
1110 * Export motion vectors through frame side data
1112 #define AV_CODEC_EXPORT_DATA_MVS (1 << 0)
1114 * Export encoder Producer Reference Time through packet side data
1116 #define AV_CODEC_EXPORT_DATA_PRFT (1 << 1)
1120 * This specifies the area which should be displayed.
1121 * Note there may be multiple such areas for one frame.
1123 typedef struct AVPanScan {
1126 * - encoding: Set by user.
1127 * - decoding: Set by libavcodec.
1132 * width and height in 1/16 pel
1133 * - encoding: Set by user.
1134 * - decoding: Set by libavcodec.
1140 * position of the top left corner in 1/16 pel for up to 3 fields/frames
1141 * - encoding: Set by user.
1142 * - decoding: Set by libavcodec.
1144 int16_t position[3][2];
1148 * This structure describes the bitrate properties of an encoded bitstream. It
1149 * roughly corresponds to a subset the VBV parameters for MPEG-2 or HRD
1150 * parameters for H.264/HEVC.
1152 typedef struct AVCPBProperties {
1154 * Maximum bitrate of the stream, in bits per second.
1155 * Zero if unknown or unspecified.
1157 #if FF_API_UNSANITIZED_BITRATES
1160 int64_t max_bitrate;
1163 * Minimum bitrate of the stream, in bits per second.
1164 * Zero if unknown or unspecified.
1166 #if FF_API_UNSANITIZED_BITRATES
1169 int64_t min_bitrate;
1172 * Average bitrate of the stream, in bits per second.
1173 * Zero if unknown or unspecified.
1175 #if FF_API_UNSANITIZED_BITRATES
1178 int64_t avg_bitrate;
1182 * The size of the buffer to which the ratecontrol is applied, in bits.
1183 * Zero if unknown or unspecified.
1188 * The delay between the time the packet this structure is associated with
1189 * is received and the time when it should be decoded, in periods of a 27MHz
1192 * UINT64_MAX when unknown or unspecified.
1198 * This structure supplies correlation between a packet timestamp and a wall clock
1199 * production time. The definition follows the Producer Reference Time ('prft')
1200 * as defined in ISO/IEC 14496-12
1202 typedef struct AVProducerReferenceTime {
1204 * A UTC timestamp, in microseconds, since Unix epoch (e.g, av_gettime()).
1208 } AVProducerReferenceTime;
1211 * The decoder will keep a reference to the frame and may reuse it later.
1213 #define AV_GET_BUFFER_FLAG_REF (1 << 0)
1216 * @defgroup lavc_packet AVPacket
1218 * Types and functions for working with AVPacket.
1221 enum AVPacketSideDataType {
1223 * An AV_PKT_DATA_PALETTE side data packet contains exactly AVPALETTE_SIZE
1224 * bytes worth of palette. This side data signals that a new palette is
1227 AV_PKT_DATA_PALETTE,
1230 * The AV_PKT_DATA_NEW_EXTRADATA is used to notify the codec or the format
1231 * that the extradata buffer was changed and the receiving side should
1232 * act upon it appropriately. The new extradata is embedded in the side
1233 * data buffer and should be immediately used for processing the current
1236 AV_PKT_DATA_NEW_EXTRADATA,
1239 * An AV_PKT_DATA_PARAM_CHANGE side data packet is laid out as follows:
1242 * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_COUNT)
1243 * s32le channel_count
1244 * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_LAYOUT)
1245 * u64le channel_layout
1246 * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_SAMPLE_RATE)
1248 * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_DIMENSIONS)
1253 AV_PKT_DATA_PARAM_CHANGE,
1256 * An AV_PKT_DATA_H263_MB_INFO side data packet contains a number of
1257 * structures with info about macroblocks relevant to splitting the
1258 * packet into smaller packets on macroblock edges (e.g. as for RFC 2190).
1259 * That is, it does not necessarily contain info about all macroblocks,
1260 * as long as the distance between macroblocks in the info is smaller
1261 * than the target payload size.
1262 * Each MB info structure is 12 bytes, and is laid out as follows:
1264 * u32le bit offset from the start of the packet
1265 * u8 current quantizer at the start of the macroblock
1267 * u16le macroblock address within the GOB
1268 * u8 horizontal MV predictor
1269 * u8 vertical MV predictor
1270 * u8 horizontal MV predictor for block number 3
1271 * u8 vertical MV predictor for block number 3
1274 AV_PKT_DATA_H263_MB_INFO,
1277 * This side data should be associated with an audio stream and contains
1278 * ReplayGain information in form of the AVReplayGain struct.
1280 AV_PKT_DATA_REPLAYGAIN,
1283 * This side data contains a 3x3 transformation matrix describing an affine
1284 * transformation that needs to be applied to the decoded video frames for
1285 * correct presentation.
1287 * See libavutil/display.h for a detailed description of the data.
1289 AV_PKT_DATA_DISPLAYMATRIX,
1292 * This side data should be associated with a video stream and contains
1293 * Stereoscopic 3D information in form of the AVStereo3D struct.
1295 AV_PKT_DATA_STEREO3D,
1298 * This side data should be associated with an audio stream and corresponds
1299 * to enum AVAudioServiceType.
1301 AV_PKT_DATA_AUDIO_SERVICE_TYPE,
1304 * This side data contains quality related information from the encoder.
1306 * u32le quality factor of the compressed frame. Allowed range is between 1 (good) and FF_LAMBDA_MAX (bad).
1310 * u64le[error count] sum of squared differences between encoder in and output
1313 AV_PKT_DATA_QUALITY_STATS,
1316 * This side data contains an integer value representing the stream index
1317 * of a "fallback" track. A fallback track indicates an alternate
1318 * track to use when the current track can not be decoded for some reason.
1319 * e.g. no decoder available for codec.
1321 AV_PKT_DATA_FALLBACK_TRACK,
1324 * This side data corresponds to the AVCPBProperties struct.
1326 AV_PKT_DATA_CPB_PROPERTIES,
1329 * Recommmends skipping the specified number of samples
1331 * u32le number of samples to skip from start of this packet
1332 * u32le number of samples to skip from end of this packet
1333 * u8 reason for start skip
1334 * u8 reason for end skip (0=padding silence, 1=convergence)
1337 AV_PKT_DATA_SKIP_SAMPLES,
1340 * An AV_PKT_DATA_JP_DUALMONO side data packet indicates that
1341 * the packet may contain "dual mono" audio specific to Japanese DTV
1342 * and if it is true, recommends only the selected channel to be used.
1344 * u8 selected channels (0=mail/left, 1=sub/right, 2=both)
1347 AV_PKT_DATA_JP_DUALMONO,
1350 * A list of zero terminated key/value strings. There is no end marker for
1351 * the list, so it is required to rely on the side data size to stop.
1353 AV_PKT_DATA_STRINGS_METADATA,
1356 * Subtitle event position
1364 AV_PKT_DATA_SUBTITLE_POSITION,
1367 * Data found in BlockAdditional element of matroska container. There is
1368 * no end marker for the data, so it is required to rely on the side data
1369 * size to recognize the end. 8 byte id (as found in BlockAddId) followed
1372 AV_PKT_DATA_MATROSKA_BLOCKADDITIONAL,
1375 * The optional first identifier line of a WebVTT cue.
1377 AV_PKT_DATA_WEBVTT_IDENTIFIER,
1380 * The optional settings (rendering instructions) that immediately
1381 * follow the timestamp specifier of a WebVTT cue.
1383 AV_PKT_DATA_WEBVTT_SETTINGS,
1386 * A list of zero terminated key/value strings. There is no end marker for
1387 * the list, so it is required to rely on the side data size to stop. This
1388 * side data includes updated metadata which appeared in the stream.
1390 AV_PKT_DATA_METADATA_UPDATE,
1393 * MPEGTS stream ID as uint8_t, this is required to pass the stream ID
1394 * information from the demuxer to the corresponding muxer.
1396 AV_PKT_DATA_MPEGTS_STREAM_ID,
1399 * Mastering display metadata (based on SMPTE-2086:2014). This metadata
1400 * should be associated with a video stream and contains data in the form
1401 * of the AVMasteringDisplayMetadata struct.
1403 AV_PKT_DATA_MASTERING_DISPLAY_METADATA,
1406 * This side data should be associated with a video stream and corresponds
1407 * to the AVSphericalMapping structure.
1409 AV_PKT_DATA_SPHERICAL,
1412 * Content light level (based on CTA-861.3). This metadata should be
1413 * associated with a video stream and contains data in the form of the
1414 * AVContentLightMetadata struct.
1416 AV_PKT_DATA_CONTENT_LIGHT_LEVEL,
1419 * ATSC A53 Part 4 Closed Captions. This metadata should be associated with
1420 * a video stream. A53 CC bitstream is stored as uint8_t in AVPacketSideData.data.
1421 * The number of bytes of CC data is AVPacketSideData.size.
1426 * This side data is encryption initialization data.
1427 * The format is not part of ABI, use av_encryption_init_info_* methods to
1430 AV_PKT_DATA_ENCRYPTION_INIT_INFO,
1433 * This side data contains encryption info for how to decrypt the packet.
1434 * The format is not part of ABI, use av_encryption_info_* methods to access.
1436 AV_PKT_DATA_ENCRYPTION_INFO,
1439 * Active Format Description data consisting of a single byte as specified
1440 * in ETSI TS 101 154 using AVActiveFormatDescription enum.
1445 * Producer Reference Time data corresponding to the AVProducerReferenceTime struct,
1446 * usually exported by some encoders (on demand through the prft flag set in the
1447 * AVCodecContext export_side_data field).
1452 * The number of side data types.
1453 * This is not part of the public API/ABI in the sense that it may
1454 * change when new side data types are added.
1455 * This must stay the last enum value.
1456 * If its value becomes huge, some code using it
1457 * needs to be updated as it assumes it to be smaller than other limits.
1462 #define AV_PKT_DATA_QUALITY_FACTOR AV_PKT_DATA_QUALITY_STATS //DEPRECATED
1464 typedef struct AVPacketSideData {
1467 enum AVPacketSideDataType type;
1471 * This structure stores compressed data. It is typically exported by demuxers
1472 * and then passed as input to decoders, or received as output from encoders and
1473 * then passed to muxers.
1475 * For video, it should typically contain one compressed frame. For audio it may
1476 * contain several compressed frames. Encoders are allowed to output empty
1477 * packets, with no compressed data, containing only side data
1478 * (e.g. to update some stream parameters at the end of encoding).
1480 * AVPacket is one of the few structs in FFmpeg, whose size is a part of public
1481 * ABI. Thus it may be allocated on stack and no new fields can be added to it
1482 * without libavcodec and libavformat major bump.
1484 * The semantics of data ownership depends on the buf field.
1485 * If it is set, the packet data is dynamically allocated and is
1486 * valid indefinitely until a call to av_packet_unref() reduces the
1487 * reference count to 0.
1489 * If the buf field is not set av_packet_ref() would make a copy instead
1490 * of increasing the reference count.
1492 * The side data is always allocated with av_malloc(), copied by
1493 * av_packet_ref() and freed by av_packet_unref().
1495 * @see av_packet_ref
1496 * @see av_packet_unref
1498 typedef struct AVPacket {
1500 * A reference to the reference-counted buffer where the packet data is
1502 * May be NULL, then the packet data is not reference-counted.
1506 * Presentation timestamp in AVStream->time_base units; the time at which
1507 * the decompressed packet will be presented to the user.
1508 * Can be AV_NOPTS_VALUE if it is not stored in the file.
1509 * pts MUST be larger or equal to dts as presentation cannot happen before
1510 * decompression, unless one wants to view hex dumps. Some formats misuse
1511 * the terms dts and pts/cts to mean something different. Such timestamps
1512 * must be converted to true pts/dts before they are stored in AVPacket.
1516 * Decompression timestamp in AVStream->time_base units; the time at which
1517 * the packet is decompressed.
1518 * Can be AV_NOPTS_VALUE if it is not stored in the file.
1525 * A combination of AV_PKT_FLAG values
1529 * Additional packet data that can be provided by the container.
1530 * Packet can contain several types of side information.
1532 AVPacketSideData *side_data;
1533 int side_data_elems;
1536 * Duration of this packet in AVStream->time_base units, 0 if unknown.
1537 * Equals next_pts - this_pts in presentation order.
1541 int64_t pos; ///< byte position in stream, -1 if unknown
1543 #if FF_API_CONVERGENCE_DURATION
1545 * @deprecated Same as the duration field, but as int64_t. This was required
1546 * for Matroska subtitles, whose duration values could overflow when the
1547 * duration field was still an int.
1549 attribute_deprecated
1550 int64_t convergence_duration;
1553 #define AV_PKT_FLAG_KEY 0x0001 ///< The packet contains a keyframe
1554 #define AV_PKT_FLAG_CORRUPT 0x0002 ///< The packet content is corrupted
1556 * Flag is used to discard packets which are required to maintain valid
1557 * decoder state but are not required for output and should be dropped
1560 #define AV_PKT_FLAG_DISCARD 0x0004
1562 * The packet comes from a trusted source.
1564 * Otherwise-unsafe constructs such as arbitrary pointers to data
1565 * outside the packet may be followed.
1567 #define AV_PKT_FLAG_TRUSTED 0x0008
1569 * Flag is used to indicate packets that contain frames that can
1570 * be discarded by the decoder. I.e. Non-reference frames.
1572 #define AV_PKT_FLAG_DISPOSABLE 0x0010
1575 enum AVSideDataParamChangeFlags {
1576 AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_COUNT = 0x0001,
1577 AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_LAYOUT = 0x0002,
1578 AV_SIDE_DATA_PARAM_CHANGE_SAMPLE_RATE = 0x0004,
1579 AV_SIDE_DATA_PARAM_CHANGE_DIMENSIONS = 0x0008,
1585 struct AVCodecInternal;
1589 AV_FIELD_PROGRESSIVE,
1590 AV_FIELD_TT, //< Top coded_first, top displayed first
1591 AV_FIELD_BB, //< Bottom coded first, bottom displayed first
1592 AV_FIELD_TB, //< Top coded first, bottom displayed first
1593 AV_FIELD_BT, //< Bottom coded first, top displayed first
1597 * main external API structure.
1598 * New fields can be added to the end with minor version bumps.
1599 * Removal, reordering and changes to existing fields require a major
1601 * You can use AVOptions (av_opt* / av_set/get*()) to access these fields from user
1603 * The name string for AVOptions options matches the associated command line
1604 * parameter name and can be found in libavcodec/options_table.h
1605 * The AVOption/command line parameter names differ in some cases from the C
1606 * structure field names for historic reasons or brevity.
1607 * sizeof(AVCodecContext) must not be used outside libav*.
1609 typedef struct AVCodecContext {
1611 * information on struct for av_log
1612 * - set by avcodec_alloc_context3
1614 const AVClass *av_class;
1615 int log_level_offset;
1617 enum AVMediaType codec_type; /* see AVMEDIA_TYPE_xxx */
1618 const struct AVCodec *codec;
1619 enum AVCodecID codec_id; /* see AV_CODEC_ID_xxx */
1622 * fourcc (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A').
1623 * This is used to work around some encoder bugs.
1624 * A demuxer should set this to what is stored in the field used to identify the codec.
1625 * If there are multiple such fields in a container then the demuxer should choose the one
1626 * which maximizes the information about the used codec.
1627 * If the codec tag field in a container is larger than 32 bits then the demuxer should
1628 * remap the longer ID to 32 bits with a table or other structure. Alternatively a new
1629 * extra_codec_tag + size could be added but for this a clear advantage must be demonstrated
1631 * - encoding: Set by user, if not then the default based on codec_id will be used.
1632 * - decoding: Set by user, will be converted to uppercase by libavcodec during init.
1634 unsigned int codec_tag;
1639 * Private context used for internal data.
1641 * Unlike priv_data, this is not codec-specific. It is used in general
1642 * libavcodec functions.
1644 struct AVCodecInternal *internal;
1647 * Private data of the user, can be used to carry app specific stuff.
1648 * - encoding: Set by user.
1649 * - decoding: Set by user.
1654 * the average bitrate
1655 * - encoding: Set by user; unused for constant quantizer encoding.
1656 * - decoding: Set by user, may be overwritten by libavcodec
1657 * if this info is available in the stream
1662 * number of bits the bitstream is allowed to diverge from the reference.
1663 * the reference can be CBR (for CBR pass1) or VBR (for pass2)
1664 * - encoding: Set by user; unused for constant quantizer encoding.
1665 * - decoding: unused
1667 int bit_rate_tolerance;
1670 * Global quality for codecs which cannot change it per frame.
1671 * This should be proportional to MPEG-1/2/4 qscale.
1672 * - encoding: Set by user.
1673 * - decoding: unused
1678 * - encoding: Set by user.
1679 * - decoding: unused
1681 int compression_level;
1682 #define FF_COMPRESSION_DEFAULT -1
1686 * - encoding: Set by user.
1687 * - decoding: Set by user.
1693 * - encoding: Set by user.
1694 * - decoding: Set by user.
1699 * some codecs need / can use extradata like Huffman tables.
1700 * MJPEG: Huffman tables
1701 * rv10: additional flags
1702 * MPEG-4: global headers (they can be in the bitstream or here)
1703 * The allocated memory should be AV_INPUT_BUFFER_PADDING_SIZE bytes larger
1704 * than extradata_size to avoid problems if it is read with the bitstream reader.
1705 * The bytewise contents of extradata must not depend on the architecture or CPU endianness.
1706 * Must be allocated with the av_malloc() family of functions.
1707 * - encoding: Set/allocated/freed by libavcodec.
1708 * - decoding: Set/allocated/freed by user.
1714 * This is the fundamental unit of time (in seconds) in terms
1715 * of which frame timestamps are represented. For fixed-fps content,
1716 * timebase should be 1/framerate and timestamp increments should be
1718 * This often, but not always is the inverse of the frame rate or field rate
1719 * for video. 1/time_base is not the average frame rate if the frame rate is not
1722 * Like containers, elementary streams also can store timestamps, 1/time_base
1723 * is the unit in which these timestamps are specified.
1724 * As example of such codec time base see ISO/IEC 14496-2:2001(E)
1725 * vop_time_increment_resolution and fixed_vop_rate
1726 * (fixed_vop_rate == 0 implies that it is different from the framerate)
1728 * - encoding: MUST be set by user.
1729 * - decoding: the use of this field for decoding is deprecated.
1730 * Use framerate instead.
1732 AVRational time_base;
1735 * For some codecs, the time base is closer to the field rate than the frame rate.
1736 * Most notably, H.264 and MPEG-2 specify time_base as half of frame duration
1737 * if no telecine is used ...
1739 * Set to time_base ticks per frame. Default 1, e.g., H.264/MPEG-2 set it to 2.
1741 int ticks_per_frame;
1746 * Encoding: Number of frames delay there will be from the encoder input to
1747 * the decoder output. (we assume the decoder matches the spec)
1748 * Decoding: Number of frames delay in addition to what a standard decoder
1749 * as specified in the spec would produce.
1752 * Number of frames the decoded output will be delayed relative to the
1756 * For encoding, this field is unused (see initial_padding).
1758 * For decoding, this is the number of samples the decoder needs to
1759 * output before the decoder's output is valid. When seeking, you should
1760 * start decoding this many samples prior to your desired seek point.
1762 * - encoding: Set by libavcodec.
1763 * - decoding: Set by libavcodec.
1770 * picture width / height.
1772 * @note Those fields may not match the values of the last
1773 * AVFrame output by avcodec_decode_video2 due frame
1776 * - encoding: MUST be set by user.
1777 * - decoding: May be set by the user before opening the decoder if known e.g.
1778 * from the container. Some decoders will require the dimensions
1779 * to be set by the caller. During decoding, the decoder may
1780 * overwrite those values as required while parsing the data.
1785 * Bitstream width / height, may be different from width/height e.g. when
1786 * the decoded frame is cropped before being output or lowres is enabled.
1788 * @note Those field may not match the value of the last
1789 * AVFrame output by avcodec_receive_frame() due frame
1792 * - encoding: unused
1793 * - decoding: May be set by the user before opening the decoder if known
1794 * e.g. from the container. During decoding, the decoder may
1795 * overwrite those values as required while parsing the data.
1797 int coded_width, coded_height;
1800 * the number of pictures in a group of pictures, or 0 for intra_only
1801 * - encoding: Set by user.
1802 * - decoding: unused
1807 * Pixel format, see AV_PIX_FMT_xxx.
1808 * May be set by the demuxer if known from headers.
1809 * May be overridden by the decoder if it knows better.
1811 * @note This field may not match the value of the last
1812 * AVFrame output by avcodec_receive_frame() due frame
1815 * - encoding: Set by user.
1816 * - decoding: Set by user if known, overridden by libavcodec while
1819 enum AVPixelFormat pix_fmt;
1822 * If non NULL, 'draw_horiz_band' is called by the libavcodec
1823 * decoder to draw a horizontal band. It improves cache usage. Not
1824 * all codecs can do that. You must check the codec capabilities
1826 * When multithreading is used, it may be called from multiple threads
1827 * at the same time; threads might draw different parts of the same AVFrame,
1828 * or multiple AVFrames, and there is no guarantee that slices will be drawn
1830 * The function is also used by hardware acceleration APIs.
1831 * It is called at least once during frame decoding to pass
1832 * the data needed for hardware render.
1833 * In that mode instead of pixel data, AVFrame points to
1834 * a structure specific to the acceleration API. The application
1835 * reads the structure and can change some fields to indicate progress
1837 * - encoding: unused
1838 * - decoding: Set by user.
1839 * @param height the height of the slice
1840 * @param y the y position of the slice
1841 * @param type 1->top field, 2->bottom field, 3->frame
1842 * @param offset offset into the AVFrame.data from which the slice should be read
1844 void (*draw_horiz_band)(struct AVCodecContext *s,
1845 const AVFrame *src, int offset[AV_NUM_DATA_POINTERS],
1846 int y, int type, int height);
1849 * callback to negotiate the pixelFormat
1850 * @param fmt is the list of formats which are supported by the codec,
1851 * it is terminated by -1 as 0 is a valid format, the formats are ordered by quality.
1852 * The first is always the native one.
1853 * @note The callback may be called again immediately if initialization for
1854 * the selected (hardware-accelerated) pixel format failed.
1855 * @warning Behavior is undefined if the callback returns a value not
1856 * in the fmt list of formats.
1857 * @return the chosen format
1858 * - encoding: unused
1859 * - decoding: Set by user, if not set the native format will be chosen.
1861 enum AVPixelFormat (*get_format)(struct AVCodecContext *s, const enum AVPixelFormat * fmt);
1864 * maximum number of B-frames between non-B-frames
1865 * Note: The output will be delayed by max_b_frames+1 relative to the input.
1866 * - encoding: Set by user.
1867 * - decoding: unused
1872 * qscale factor between IP and B-frames
1873 * If > 0 then the last P-frame quantizer will be used (q= lastp_q*factor+offset).
1874 * If < 0 then normal ratecontrol will be done (q= -normal_q*factor+offset).
1875 * - encoding: Set by user.
1876 * - decoding: unused
1878 float b_quant_factor;
1880 #if FF_API_PRIVATE_OPT
1881 /** @deprecated use encoder private options instead */
1882 attribute_deprecated
1883 int b_frame_strategy;
1887 * qscale offset between IP and B-frames
1888 * - encoding: Set by user.
1889 * - decoding: unused
1891 float b_quant_offset;
1894 * Size of the frame reordering buffer in the decoder.
1895 * For MPEG-2 it is 1 IPB or 0 low delay IP.
1896 * - encoding: Set by libavcodec.
1897 * - decoding: Set by libavcodec.
1901 #if FF_API_PRIVATE_OPT
1902 /** @deprecated use encoder private options instead */
1903 attribute_deprecated
1908 * qscale factor between P- and I-frames
1909 * If > 0 then the last P-frame quantizer will be used (q = lastp_q * factor + offset).
1910 * If < 0 then normal ratecontrol will be done (q= -normal_q*factor+offset).
1911 * - encoding: Set by user.
1912 * - decoding: unused
1914 float i_quant_factor;
1917 * qscale offset between P and I-frames
1918 * - encoding: Set by user.
1919 * - decoding: unused
1921 float i_quant_offset;
1924 * luminance masking (0-> disabled)
1925 * - encoding: Set by user.
1926 * - decoding: unused
1931 * temporary complexity masking (0-> disabled)
1932 * - encoding: Set by user.
1933 * - decoding: unused
1935 float temporal_cplx_masking;
1938 * spatial complexity masking (0-> disabled)
1939 * - encoding: Set by user.
1940 * - decoding: unused
1942 float spatial_cplx_masking;
1945 * p block masking (0-> disabled)
1946 * - encoding: Set by user.
1947 * - decoding: unused
1952 * darkness masking (0-> disabled)
1953 * - encoding: Set by user.
1954 * - decoding: unused
1960 * - encoding: Set by libavcodec.
1961 * - decoding: Set by user (or 0).
1965 #if FF_API_PRIVATE_OPT
1966 /** @deprecated use encoder private options instead */
1967 attribute_deprecated
1968 int prediction_method;
1969 #define FF_PRED_LEFT 0
1970 #define FF_PRED_PLANE 1
1971 #define FF_PRED_MEDIAN 2
1975 * slice offsets in the frame in bytes
1976 * - encoding: Set/allocated by libavcodec.
1977 * - decoding: Set/allocated by user (or NULL).
1982 * sample aspect ratio (0 if unknown)
1983 * That is the width of a pixel divided by the height of the pixel.
1984 * Numerator and denominator must be relatively prime and smaller than 256 for some video standards.
1985 * - encoding: Set by user.
1986 * - decoding: Set by libavcodec.
1988 AVRational sample_aspect_ratio;
1991 * motion estimation comparison function
1992 * - encoding: Set by user.
1993 * - decoding: unused
1997 * subpixel motion estimation comparison function
1998 * - encoding: Set by user.
1999 * - decoding: unused
2003 * macroblock comparison function (not supported yet)
2004 * - encoding: Set by user.
2005 * - decoding: unused
2009 * interlaced DCT comparison function
2010 * - encoding: Set by user.
2011 * - decoding: unused
2014 #define FF_CMP_SAD 0
2015 #define FF_CMP_SSE 1
2016 #define FF_CMP_SATD 2
2017 #define FF_CMP_DCT 3
2018 #define FF_CMP_PSNR 4
2019 #define FF_CMP_BIT 5
2021 #define FF_CMP_ZERO 7
2022 #define FF_CMP_VSAD 8
2023 #define FF_CMP_VSSE 9
2024 #define FF_CMP_NSSE 10
2025 #define FF_CMP_W53 11
2026 #define FF_CMP_W97 12
2027 #define FF_CMP_DCTMAX 13
2028 #define FF_CMP_DCT264 14
2029 #define FF_CMP_MEDIAN_SAD 15
2030 #define FF_CMP_CHROMA 256
2033 * ME diamond size & shape
2034 * - encoding: Set by user.
2035 * - decoding: unused
2040 * amount of previous MV predictors (2a+1 x 2a+1 square)
2041 * - encoding: Set by user.
2042 * - decoding: unused
2044 int last_predictor_count;
2046 #if FF_API_PRIVATE_OPT
2047 /** @deprecated use encoder private options instead */
2048 attribute_deprecated
2053 * motion estimation prepass comparison function
2054 * - encoding: Set by user.
2055 * - decoding: unused
2060 * ME prepass diamond size & shape
2061 * - encoding: Set by user.
2062 * - decoding: unused
2068 * - encoding: Set by user.
2069 * - decoding: unused
2071 int me_subpel_quality;
2074 * maximum motion estimation search range in subpel units
2075 * If 0 then no limit.
2077 * - encoding: Set by user.
2078 * - decoding: unused
2084 * - encoding: unused
2085 * - decoding: Set by user.
2088 #define SLICE_FLAG_CODED_ORDER 0x0001 ///< draw_horiz_band() is called in coded order instead of display
2089 #define SLICE_FLAG_ALLOW_FIELD 0x0002 ///< allow draw_horiz_band() with field slices (MPEG-2 field pics)
2090 #define SLICE_FLAG_ALLOW_PLANE 0x0004 ///< allow draw_horiz_band() with 1 component at a time (SVQ1)
2093 * macroblock decision mode
2094 * - encoding: Set by user.
2095 * - decoding: unused
2098 #define FF_MB_DECISION_SIMPLE 0 ///< uses mb_cmp
2099 #define FF_MB_DECISION_BITS 1 ///< chooses the one which needs the fewest bits
2100 #define FF_MB_DECISION_RD 2 ///< rate distortion
2103 * custom intra quantization matrix
2104 * Must be allocated with the av_malloc() family of functions, and will be freed in
2105 * avcodec_free_context().
2106 * - encoding: Set/allocated by user, freed by libavcodec. Can be NULL.
2107 * - decoding: Set/allocated/freed by libavcodec.
2109 uint16_t *intra_matrix;
2112 * custom inter quantization matrix
2113 * Must be allocated with the av_malloc() family of functions, and will be freed in
2114 * avcodec_free_context().
2115 * - encoding: Set/allocated by user, freed by libavcodec. Can be NULL.
2116 * - decoding: Set/allocated/freed by libavcodec.
2118 uint16_t *inter_matrix;
2120 #if FF_API_PRIVATE_OPT
2121 /** @deprecated use encoder private options instead */
2122 attribute_deprecated
2123 int scenechange_threshold;
2125 /** @deprecated use encoder private options instead */
2126 attribute_deprecated
2127 int noise_reduction;
2131 * precision of the intra DC coefficient - 8
2132 * - encoding: Set by user.
2133 * - decoding: Set by libavcodec
2135 int intra_dc_precision;
2138 * Number of macroblock rows at the top which are skipped.
2139 * - encoding: unused
2140 * - decoding: Set by user.
2145 * Number of macroblock rows at the bottom which are skipped.
2146 * - encoding: unused
2147 * - decoding: Set by user.
2152 * minimum MB Lagrange multiplier
2153 * - encoding: Set by user.
2154 * - decoding: unused
2159 * maximum MB Lagrange multiplier
2160 * - encoding: Set by user.
2161 * - decoding: unused
2165 #if FF_API_PRIVATE_OPT
2167 * @deprecated use encoder private options instead
2169 attribute_deprecated
2170 int me_penalty_compensation;
2174 * - encoding: Set by user.
2175 * - decoding: unused
2179 #if FF_API_PRIVATE_OPT
2180 /** @deprecated use encoder private options instead */
2181 attribute_deprecated
2187 * - encoding: Set by user.
2188 * - decoding: unused
2193 * number of reference frames
2194 * - encoding: Set by user.
2195 * - decoding: Set by lavc.
2199 #if FF_API_PRIVATE_OPT
2200 /** @deprecated use encoder private options instead */
2201 attribute_deprecated
2206 * Note: Value depends upon the compare function used for fullpel ME.
2207 * - encoding: Set by user.
2208 * - decoding: unused
2212 #if FF_API_PRIVATE_OPT
2213 /** @deprecated use encoder private options instead */
2214 attribute_deprecated
2219 * Chromaticity coordinates of the source primaries.
2220 * - encoding: Set by user
2221 * - decoding: Set by libavcodec
2223 enum AVColorPrimaries color_primaries;
2226 * Color Transfer Characteristic.
2227 * - encoding: Set by user
2228 * - decoding: Set by libavcodec
2230 enum AVColorTransferCharacteristic color_trc;
2233 * YUV colorspace type.
2234 * - encoding: Set by user
2235 * - decoding: Set by libavcodec
2237 enum AVColorSpace colorspace;
2240 * MPEG vs JPEG YUV range.
2241 * - encoding: Set by user
2242 * - decoding: Set by libavcodec
2244 enum AVColorRange color_range;
2247 * This defines the location of chroma samples.
2248 * - encoding: Set by user
2249 * - decoding: Set by libavcodec
2251 enum AVChromaLocation chroma_sample_location;
2255 * Indicates number of picture subdivisions. Used for parallelized
2257 * - encoding: Set by user
2258 * - decoding: unused
2263 * - encoding: set by libavcodec
2264 * - decoding: Set by user.
2266 enum AVFieldOrder field_order;
2269 int sample_rate; ///< samples per second
2270 int channels; ///< number of audio channels
2273 * audio sample format
2274 * - encoding: Set by user.
2275 * - decoding: Set by libavcodec.
2277 enum AVSampleFormat sample_fmt; ///< sample format
2279 /* The following data should not be initialized. */
2281 * Number of samples per channel in an audio frame.
2283 * - encoding: set by libavcodec in avcodec_open2(). Each submitted frame
2284 * except the last must contain exactly frame_size samples per channel.
2285 * May be 0 when the codec has AV_CODEC_CAP_VARIABLE_FRAME_SIZE set, then the
2286 * frame size is not restricted.
2287 * - decoding: may be set by some decoders to indicate constant frame size
2292 * Frame counter, set by libavcodec.
2294 * - decoding: total number of frames returned from the decoder so far.
2295 * - encoding: total number of frames passed to the encoder so far.
2297 * @note the counter is not incremented if encoding/decoding resulted in
2303 * number of bytes per packet if constant and known or 0
2304 * Used by some WAV based audio codecs.
2309 * Audio cutoff bandwidth (0 means "automatic")
2310 * - encoding: Set by user.
2311 * - decoding: unused
2316 * Audio channel layout.
2317 * - encoding: set by user.
2318 * - decoding: set by user, may be overwritten by libavcodec.
2320 uint64_t channel_layout;
2323 * Request decoder to use this channel layout if it can (0 for default)
2324 * - encoding: unused
2325 * - decoding: Set by user.
2327 uint64_t request_channel_layout;
2330 * Type of service that the audio stream conveys.
2331 * - encoding: Set by user.
2332 * - decoding: Set by libavcodec.
2334 enum AVAudioServiceType audio_service_type;
2337 * desired sample format
2338 * - encoding: Not used.
2339 * - decoding: Set by user.
2340 * Decoder will decode to this format if it can.
2342 enum AVSampleFormat request_sample_fmt;
2345 * This callback is called at the beginning of each frame to get data
2346 * buffer(s) for it. There may be one contiguous buffer for all the data or
2347 * there may be a buffer per each data plane or anything in between. What
2348 * this means is, you may set however many entries in buf[] you feel necessary.
2349 * Each buffer must be reference-counted using the AVBuffer API (see description
2352 * The following fields will be set in the frame before this callback is
2355 * - width, height (video only)
2356 * - sample_rate, channel_layout, nb_samples (audio only)
2357 * Their values may differ from the corresponding values in
2358 * AVCodecContext. This callback must use the frame values, not the codec
2359 * context values, to calculate the required buffer size.
2361 * This callback must fill the following fields in the frame:
2365 * * if the data is planar audio with more than 8 channels, then this
2366 * callback must allocate and fill extended_data to contain all pointers
2367 * to all data planes. data[] must hold as many pointers as it can.
2368 * extended_data must be allocated with av_malloc() and will be freed in
2370 * * otherwise extended_data must point to data
2371 * - buf[] must contain one or more pointers to AVBufferRef structures. Each of
2372 * the frame's data and extended_data pointers must be contained in these. That
2373 * is, one AVBufferRef for each allocated chunk of memory, not necessarily one
2374 * AVBufferRef per data[] entry. See: av_buffer_create(), av_buffer_alloc(),
2375 * and av_buffer_ref().
2376 * - extended_buf and nb_extended_buf must be allocated with av_malloc() by
2377 * this callback and filled with the extra buffers if there are more
2378 * buffers than buf[] can hold. extended_buf will be freed in
2381 * If AV_CODEC_CAP_DR1 is not set then get_buffer2() must call
2382 * avcodec_default_get_buffer2() instead of providing buffers allocated by
2385 * Each data plane must be aligned to the maximum required by the target
2388 * @see avcodec_default_get_buffer2()
2392 * If AV_GET_BUFFER_FLAG_REF is set in flags then the frame may be reused
2393 * (read and/or written to if it is writable) later by libavcodec.
2395 * avcodec_align_dimensions2() should be used to find the required width and
2396 * height, as they normally need to be rounded up to the next multiple of 16.
2398 * Some decoders do not support linesizes changing between frames.
2400 * If frame multithreading is used and thread_safe_callbacks is set,
2401 * this callback may be called from a different thread, but not from more
2402 * than one at once. Does not need to be reentrant.
2404 * @see avcodec_align_dimensions2()
2408 * Decoders request a buffer of a particular size by setting
2409 * AVFrame.nb_samples prior to calling get_buffer2(). The decoder may,
2410 * however, utilize only part of the buffer by setting AVFrame.nb_samples
2411 * to a smaller value in the output frame.
2413 * As a convenience, av_samples_get_buffer_size() and
2414 * av_samples_fill_arrays() in libavutil may be used by custom get_buffer2()
2415 * functions to find the required data size and to fill data pointers and
2416 * linesize. In AVFrame.linesize, only linesize[0] may be set for audio
2417 * since all planes must be the same size.
2419 * @see av_samples_get_buffer_size(), av_samples_fill_arrays()
2421 * - encoding: unused
2422 * - decoding: Set by libavcodec, user can override.
2424 int (*get_buffer2)(struct AVCodecContext *s, AVFrame *frame, int flags);
2427 * If non-zero, the decoded audio and video frames returned from
2428 * avcodec_decode_video2() and avcodec_decode_audio4() are reference-counted
2429 * and are valid indefinitely. The caller must free them with
2430 * av_frame_unref() when they are not needed anymore.
2431 * Otherwise, the decoded frames must not be freed by the caller and are
2432 * only valid until the next decode call.
2434 * This is always automatically enabled if avcodec_receive_frame() is used.
2436 * - encoding: unused
2437 * - decoding: set by the caller before avcodec_open2().
2439 attribute_deprecated
2440 int refcounted_frames;
2442 /* - encoding parameters */
2443 float qcompress; ///< amount of qscale change between easy & hard scenes (0.0-1.0)
2444 float qblur; ///< amount of qscale smoothing over time (0.0-1.0)
2448 * - encoding: Set by user.
2449 * - decoding: unused
2455 * - encoding: Set by user.
2456 * - decoding: unused
2461 * maximum quantizer difference between frames
2462 * - encoding: Set by user.
2463 * - decoding: unused
2468 * decoder bitstream buffer size
2469 * - encoding: Set by user.
2470 * - decoding: unused
2475 * ratecontrol override, see RcOverride
2476 * - encoding: Allocated/set/freed by user.
2477 * - decoding: unused
2479 int rc_override_count;
2480 RcOverride *rc_override;
2484 * - encoding: Set by user.
2485 * - decoding: Set by user, may be overwritten by libavcodec.
2487 int64_t rc_max_rate;
2491 * - encoding: Set by user.
2492 * - decoding: unused
2494 int64_t rc_min_rate;
2497 * Ratecontrol attempt to use, at maximum, <value> of what can be used without an underflow.
2498 * - encoding: Set by user.
2499 * - decoding: unused.
2501 float rc_max_available_vbv_use;
2504 * Ratecontrol attempt to use, at least, <value> times the amount needed to prevent a vbv overflow.
2505 * - encoding: Set by user.
2506 * - decoding: unused.
2508 float rc_min_vbv_overflow_use;
2511 * Number of bits which should be loaded into the rc buffer before decoding starts.
2512 * - encoding: Set by user.
2513 * - decoding: unused
2515 int rc_initial_buffer_occupancy;
2517 #if FF_API_CODER_TYPE
2518 #define FF_CODER_TYPE_VLC 0
2519 #define FF_CODER_TYPE_AC 1
2520 #define FF_CODER_TYPE_RAW 2
2521 #define FF_CODER_TYPE_RLE 3
2523 * @deprecated use encoder private options instead
2525 attribute_deprecated
2527 #endif /* FF_API_CODER_TYPE */
2529 #if FF_API_PRIVATE_OPT
2530 /** @deprecated use encoder private options instead */
2531 attribute_deprecated
2535 #if FF_API_PRIVATE_OPT
2536 /** @deprecated use encoder private options instead */
2537 attribute_deprecated
2538 int frame_skip_threshold;
2540 /** @deprecated use encoder private options instead */
2541 attribute_deprecated
2542 int frame_skip_factor;
2544 /** @deprecated use encoder private options instead */
2545 attribute_deprecated
2548 /** @deprecated use encoder private options instead */
2549 attribute_deprecated
2551 #endif /* FF_API_PRIVATE_OPT */
2554 * trellis RD quantization
2555 * - encoding: Set by user.
2556 * - decoding: unused
2560 #if FF_API_PRIVATE_OPT
2561 /** @deprecated use encoder private options instead */
2562 attribute_deprecated
2563 int min_prediction_order;
2565 /** @deprecated use encoder private options instead */
2566 attribute_deprecated
2567 int max_prediction_order;
2569 /** @deprecated use encoder private options instead */
2570 attribute_deprecated
2571 int64_t timecode_frame_start;
2574 #if FF_API_RTP_CALLBACK
2576 * @deprecated unused
2578 /* The RTP callback: This function is called */
2579 /* every time the encoder has a packet to send. */
2580 /* It depends on the encoder if the data starts */
2581 /* with a Start Code (it should). H.263 does. */
2582 /* mb_nb contains the number of macroblocks */
2583 /* encoded in the RTP payload. */
2584 attribute_deprecated
2585 void (*rtp_callback)(struct AVCodecContext *avctx, void *data, int size, int mb_nb);
2588 #if FF_API_PRIVATE_OPT
2589 /** @deprecated use encoder private options instead */
2590 attribute_deprecated
2591 int rtp_payload_size; /* The size of the RTP payload: the coder will */
2592 /* do its best to deliver a chunk with size */
2593 /* below rtp_payload_size, the chunk will start */
2594 /* with a start code on some codecs like H.263. */
2595 /* This doesn't take account of any particular */
2596 /* headers inside the transmitted RTP payload. */
2599 #if FF_API_STAT_BITS
2600 /* statistics, used for 2-pass encoding */
2601 attribute_deprecated
2603 attribute_deprecated
2605 attribute_deprecated
2607 attribute_deprecated
2609 attribute_deprecated
2611 attribute_deprecated
2613 attribute_deprecated
2615 attribute_deprecated
2618 /** @deprecated this field is unused */
2619 attribute_deprecated
2624 * pass1 encoding statistics output buffer
2625 * - encoding: Set by libavcodec.
2626 * - decoding: unused
2631 * pass2 encoding statistics input buffer
2632 * Concatenated stuff from stats_out of pass1 should be placed here.
2633 * - encoding: Allocated/set/freed by user.
2634 * - decoding: unused
2639 * Work around bugs in encoders which sometimes cannot be detected automatically.
2640 * - encoding: Set by user
2641 * - decoding: Set by user
2643 int workaround_bugs;
2644 #define FF_BUG_AUTODETECT 1 ///< autodetection
2645 #define FF_BUG_XVID_ILACE 4
2646 #define FF_BUG_UMP4 8
2647 #define FF_BUG_NO_PADDING 16
2648 #define FF_BUG_AMV 32
2649 #define FF_BUG_QPEL_CHROMA 64
2650 #define FF_BUG_STD_QPEL 128
2651 #define FF_BUG_QPEL_CHROMA2 256
2652 #define FF_BUG_DIRECT_BLOCKSIZE 512
2653 #define FF_BUG_EDGE 1024
2654 #define FF_BUG_HPEL_CHROMA 2048
2655 #define FF_BUG_DC_CLIP 4096
2656 #define FF_BUG_MS 8192 ///< Work around various bugs in Microsoft's broken decoders.
2657 #define FF_BUG_TRUNCATED 16384
2658 #define FF_BUG_IEDGE 32768
2661 * strictly follow the standard (MPEG-4, ...).
2662 * - encoding: Set by user.
2663 * - decoding: Set by user.
2664 * Setting this to STRICT or higher means the encoder and decoder will
2665 * generally do stupid things, whereas setting it to unofficial or lower
2666 * will mean the encoder might produce output that is not supported by all
2667 * spec-compliant decoders. Decoders don't differentiate between normal,
2668 * unofficial and experimental (that is, they always try to decode things
2669 * when they can) unless they are explicitly asked to behave stupidly
2670 * (=strictly conform to the specs)
2672 int strict_std_compliance;
2673 #define FF_COMPLIANCE_VERY_STRICT 2 ///< Strictly conform to an older more strict version of the spec or reference software.
2674 #define FF_COMPLIANCE_STRICT 1 ///< Strictly conform to all the things in the spec no matter what consequences.
2675 #define FF_COMPLIANCE_NORMAL 0
2676 #define FF_COMPLIANCE_UNOFFICIAL -1 ///< Allow unofficial extensions
2677 #define FF_COMPLIANCE_EXPERIMENTAL -2 ///< Allow nonstandardized experimental things.
2680 * error concealment flags
2681 * - encoding: unused
2682 * - decoding: Set by user.
2684 int error_concealment;
2685 #define FF_EC_GUESS_MVS 1
2686 #define FF_EC_DEBLOCK 2
2687 #define FF_EC_FAVOR_INTER 256
2691 * - encoding: Set by user.
2692 * - decoding: Set by user.
2695 #define FF_DEBUG_PICT_INFO 1
2696 #define FF_DEBUG_RC 2
2697 #define FF_DEBUG_BITSTREAM 4
2698 #define FF_DEBUG_MB_TYPE 8
2699 #define FF_DEBUG_QP 16
2702 * @deprecated this option does nothing
2704 #define FF_DEBUG_MV 32
2706 #define FF_DEBUG_DCT_COEFF 0x00000040
2707 #define FF_DEBUG_SKIP 0x00000080
2708 #define FF_DEBUG_STARTCODE 0x00000100
2709 #define FF_DEBUG_ER 0x00000400
2710 #define FF_DEBUG_MMCO 0x00000800
2711 #define FF_DEBUG_BUGS 0x00001000
2713 #define FF_DEBUG_VIS_QP 0x00002000
2714 #define FF_DEBUG_VIS_MB_TYPE 0x00004000
2716 #define FF_DEBUG_BUFFERS 0x00008000
2717 #define FF_DEBUG_THREADS 0x00010000
2718 #define FF_DEBUG_GREEN_MD 0x00800000
2719 #define FF_DEBUG_NOMC 0x01000000
2724 * - encoding: Set by user.
2725 * - decoding: Set by user.
2728 #define FF_DEBUG_VIS_MV_P_FOR 0x00000001 // visualize forward predicted MVs of P-frames
2729 #define FF_DEBUG_VIS_MV_B_FOR 0x00000002 // visualize forward predicted MVs of B-frames
2730 #define FF_DEBUG_VIS_MV_B_BACK 0x00000004 // visualize backward predicted MVs of B-frames
2734 * Error recognition; may misdetect some more or less valid parts as errors.
2735 * - encoding: unused
2736 * - decoding: Set by user.
2738 int err_recognition;
2741 * Verify checksums embedded in the bitstream (could be of either encoded or
2742 * decoded data, depending on the codec) and print an error message on mismatch.
2743 * If AV_EF_EXPLODE is also set, a mismatching checksum will result in the
2744 * decoder returning an error.
2746 #define AV_EF_CRCCHECK (1<<0)
2747 #define AV_EF_BITSTREAM (1<<1) ///< detect bitstream specification deviations
2748 #define AV_EF_BUFFER (1<<2) ///< detect improper bitstream length
2749 #define AV_EF_EXPLODE (1<<3) ///< abort decoding on minor error detection
2751 #define AV_EF_IGNORE_ERR (1<<15) ///< ignore errors and continue
2752 #define AV_EF_CAREFUL (1<<16) ///< consider things that violate the spec, are fast to calculate and have not been seen in the wild as errors
2753 #define AV_EF_COMPLIANT (1<<17) ///< consider all spec non compliances as errors
2754 #define AV_EF_AGGRESSIVE (1<<18) ///< consider things that a sane encoder should not do as an error
2758 * opaque 64-bit number (generally a PTS) that will be reordered and
2759 * output in AVFrame.reordered_opaque
2760 * - encoding: Set by libavcodec to the reordered_opaque of the input
2761 * frame corresponding to the last returned packet. Only
2762 * supported by encoders with the
2763 * AV_CODEC_CAP_ENCODER_REORDERED_OPAQUE capability.
2764 * - decoding: Set by user.
2766 int64_t reordered_opaque;
2769 * Hardware accelerator in use
2770 * - encoding: unused.
2771 * - decoding: Set by libavcodec
2773 const struct AVHWAccel *hwaccel;
2776 * Hardware accelerator context.
2777 * For some hardware accelerators, a global context needs to be
2778 * provided by the user. In that case, this holds display-dependent
2779 * data FFmpeg cannot instantiate itself. Please refer to the
2780 * FFmpeg HW accelerator documentation to know how to fill this
2781 * is. e.g. for VA API, this is a struct vaapi_context.
2782 * - encoding: unused
2783 * - decoding: Set by user
2785 void *hwaccel_context;
2789 * - encoding: Set by libavcodec if flags & AV_CODEC_FLAG_PSNR.
2790 * - decoding: unused
2792 uint64_t error[AV_NUM_DATA_POINTERS];
2795 * DCT algorithm, see FF_DCT_* below
2796 * - encoding: Set by user.
2797 * - decoding: unused
2800 #define FF_DCT_AUTO 0
2801 #define FF_DCT_FASTINT 1
2802 #define FF_DCT_INT 2
2803 #define FF_DCT_MMX 3
2804 #define FF_DCT_ALTIVEC 5
2805 #define FF_DCT_FAAN 6
2808 * IDCT algorithm, see FF_IDCT_* below.
2809 * - encoding: Set by user.
2810 * - decoding: Set by user.
2813 #define FF_IDCT_AUTO 0
2814 #define FF_IDCT_INT 1
2815 #define FF_IDCT_SIMPLE 2
2816 #define FF_IDCT_SIMPLEMMX 3
2817 #define FF_IDCT_ARM 7
2818 #define FF_IDCT_ALTIVEC 8
2819 #define FF_IDCT_SIMPLEARM 10
2820 #define FF_IDCT_XVID 14
2821 #define FF_IDCT_SIMPLEARMV5TE 16
2822 #define FF_IDCT_SIMPLEARMV6 17
2823 #define FF_IDCT_FAAN 20
2824 #define FF_IDCT_SIMPLENEON 22
2825 #define FF_IDCT_NONE 24 /* Used by XvMC to extract IDCT coefficients with FF_IDCT_PERM_NONE */
2826 #define FF_IDCT_SIMPLEAUTO 128
2829 * bits per sample/pixel from the demuxer (needed for huffyuv).
2830 * - encoding: Set by libavcodec.
2831 * - decoding: Set by user.
2833 int bits_per_coded_sample;
2836 * Bits per sample/pixel of internal libavcodec pixel/sample format.
2837 * - encoding: set by user.
2838 * - decoding: set by libavcodec.
2840 int bits_per_raw_sample;
2844 * low resolution decoding, 1-> 1/2 size, 2->1/4 size
2845 * - encoding: unused
2846 * - decoding: Set by user.
2851 #if FF_API_CODED_FRAME
2853 * the picture in the bitstream
2854 * - encoding: Set by libavcodec.
2855 * - decoding: unused
2857 * @deprecated use the quality factor packet side data instead
2859 attribute_deprecated AVFrame *coded_frame;
2864 * is used to decide how many independent tasks should be passed to execute()
2865 * - encoding: Set by user.
2866 * - decoding: Set by user.
2871 * Which multithreading methods to use.
2872 * Use of FF_THREAD_FRAME will increase decoding delay by one frame per thread,
2873 * so clients which cannot provide future frames should not use it.
2875 * - encoding: Set by user, otherwise the default is used.
2876 * - decoding: Set by user, otherwise the default is used.
2879 #define FF_THREAD_FRAME 1 ///< Decode more than one frame at once
2880 #define FF_THREAD_SLICE 2 ///< Decode more than one part of a single frame at once
2883 * Which multithreading methods are in use by the codec.
2884 * - encoding: Set by libavcodec.
2885 * - decoding: Set by libavcodec.
2887 int active_thread_type;
2890 * Set by the client if its custom get_buffer() callback can be called
2891 * synchronously from another thread, which allows faster multithreaded decoding.
2892 * draw_horiz_band() will be called from other threads regardless of this setting.
2893 * Ignored if the default get_buffer() is used.
2894 * - encoding: Set by user.
2895 * - decoding: Set by user.
2897 int thread_safe_callbacks;
2900 * The codec may call this to execute several independent things.
2901 * It will return only after finishing all tasks.
2902 * The user may replace this with some multithreaded implementation,
2903 * the default implementation will execute the parts serially.
2904 * @param count the number of things to execute
2905 * - encoding: Set by libavcodec, user can override.
2906 * - decoding: Set by libavcodec, user can override.
2908 int (*execute)(struct AVCodecContext *c, int (*func)(struct AVCodecContext *c2, void *arg), void *arg2, int *ret, int count, int size);
2911 * The codec may call this to execute several independent things.
2912 * It will return only after finishing all tasks.
2913 * The user may replace this with some multithreaded implementation,
2914 * the default implementation will execute the parts serially.
2915 * Also see avcodec_thread_init and e.g. the --enable-pthread configure option.
2916 * @param c context passed also to func
2917 * @param count the number of things to execute
2918 * @param arg2 argument passed unchanged to func
2919 * @param ret return values of executed functions, must have space for "count" values. May be NULL.
2920 * @param func function that will be called count times, with jobnr from 0 to count-1.
2921 * threadnr will be in the range 0 to c->thread_count-1 < MAX_THREADS and so that no
2922 * two instances of func executing at the same time will have the same threadnr.
2923 * @return always 0 currently, but code should handle a future improvement where when any call to func
2924 * returns < 0 no further calls to func may be done and < 0 is returned.
2925 * - encoding: Set by libavcodec, user can override.
2926 * - decoding: Set by libavcodec, user can override.
2928 int (*execute2)(struct AVCodecContext *c, int (*func)(struct AVCodecContext *c2, void *arg, int jobnr, int threadnr), void *arg2, int *ret, int count);
2931 * noise vs. sse weight for the nsse comparison function
2932 * - encoding: Set by user.
2933 * - decoding: unused
2939 * - encoding: Set by user.
2940 * - decoding: Set by libavcodec.
2943 #define FF_PROFILE_UNKNOWN -99
2944 #define FF_PROFILE_RESERVED -100
2946 #define FF_PROFILE_AAC_MAIN 0
2947 #define FF_PROFILE_AAC_LOW 1
2948 #define FF_PROFILE_AAC_SSR 2
2949 #define FF_PROFILE_AAC_LTP 3
2950 #define FF_PROFILE_AAC_HE 4
2951 #define FF_PROFILE_AAC_HE_V2 28
2952 #define FF_PROFILE_AAC_LD 22
2953 #define FF_PROFILE_AAC_ELD 38
2954 #define FF_PROFILE_MPEG2_AAC_LOW 128
2955 #define FF_PROFILE_MPEG2_AAC_HE 131
2957 #define FF_PROFILE_DNXHD 0
2958 #define FF_PROFILE_DNXHR_LB 1
2959 #define FF_PROFILE_DNXHR_SQ 2
2960 #define FF_PROFILE_DNXHR_HQ 3
2961 #define FF_PROFILE_DNXHR_HQX 4
2962 #define FF_PROFILE_DNXHR_444 5
2964 #define FF_PROFILE_DTS 20
2965 #define FF_PROFILE_DTS_ES 30
2966 #define FF_PROFILE_DTS_96_24 40
2967 #define FF_PROFILE_DTS_HD_HRA 50
2968 #define FF_PROFILE_DTS_HD_MA 60
2969 #define FF_PROFILE_DTS_EXPRESS 70
2971 #define FF_PROFILE_MPEG2_422 0
2972 #define FF_PROFILE_MPEG2_HIGH 1
2973 #define FF_PROFILE_MPEG2_SS 2
2974 #define FF_PROFILE_MPEG2_SNR_SCALABLE 3
2975 #define FF_PROFILE_MPEG2_MAIN 4
2976 #define FF_PROFILE_MPEG2_SIMPLE 5
2978 #define FF_PROFILE_H264_CONSTRAINED (1<<9) // 8+1; constraint_set1_flag
2979 #define FF_PROFILE_H264_INTRA (1<<11) // 8+3; constraint_set3_flag
2981 #define FF_PROFILE_H264_BASELINE 66
2982 #define FF_PROFILE_H264_CONSTRAINED_BASELINE (66|FF_PROFILE_H264_CONSTRAINED)
2983 #define FF_PROFILE_H264_MAIN 77
2984 #define FF_PROFILE_H264_EXTENDED 88
2985 #define FF_PROFILE_H264_HIGH 100
2986 #define FF_PROFILE_H264_HIGH_10 110
2987 #define FF_PROFILE_H264_HIGH_10_INTRA (110|FF_PROFILE_H264_INTRA)
2988 #define FF_PROFILE_H264_MULTIVIEW_HIGH 118
2989 #define FF_PROFILE_H264_HIGH_422 122
2990 #define FF_PROFILE_H264_HIGH_422_INTRA (122|FF_PROFILE_H264_INTRA)
2991 #define FF_PROFILE_H264_STEREO_HIGH 128
2992 #define FF_PROFILE_H264_HIGH_444 144
2993 #define FF_PROFILE_H264_HIGH_444_PREDICTIVE 244
2994 #define FF_PROFILE_H264_HIGH_444_INTRA (244|FF_PROFILE_H264_INTRA)
2995 #define FF_PROFILE_H264_CAVLC_444 44
2997 #define FF_PROFILE_VC1_SIMPLE 0
2998 #define FF_PROFILE_VC1_MAIN 1
2999 #define FF_PROFILE_VC1_COMPLEX 2
3000 #define FF_PROFILE_VC1_ADVANCED 3
3002 #define FF_PROFILE_MPEG4_SIMPLE 0
3003 #define FF_PROFILE_MPEG4_SIMPLE_SCALABLE 1
3004 #define FF_PROFILE_MPEG4_CORE 2
3005 #define FF_PROFILE_MPEG4_MAIN 3
3006 #define FF_PROFILE_MPEG4_N_BIT 4
3007 #define FF_PROFILE_MPEG4_SCALABLE_TEXTURE 5
3008 #define FF_PROFILE_MPEG4_SIMPLE_FACE_ANIMATION 6
3009 #define FF_PROFILE_MPEG4_BASIC_ANIMATED_TEXTURE 7
3010 #define FF_PROFILE_MPEG4_HYBRID 8
3011 #define FF_PROFILE_MPEG4_ADVANCED_REAL_TIME 9
3012 #define FF_PROFILE_MPEG4_CORE_SCALABLE 10
3013 #define FF_PROFILE_MPEG4_ADVANCED_CODING 11
3014 #define FF_PROFILE_MPEG4_ADVANCED_CORE 12
3015 #define FF_PROFILE_MPEG4_ADVANCED_SCALABLE_TEXTURE 13
3016 #define FF_PROFILE_MPEG4_SIMPLE_STUDIO 14
3017 #define FF_PROFILE_MPEG4_ADVANCED_SIMPLE 15
3019 #define FF_PROFILE_JPEG2000_CSTREAM_RESTRICTION_0 1
3020 #define FF_PROFILE_JPEG2000_CSTREAM_RESTRICTION_1 2
3021 #define FF_PROFILE_JPEG2000_CSTREAM_NO_RESTRICTION 32768
3022 #define FF_PROFILE_JPEG2000_DCINEMA_2K 3
3023 #define FF_PROFILE_JPEG2000_DCINEMA_4K 4
3025 #define FF_PROFILE_VP9_0 0
3026 #define FF_PROFILE_VP9_1 1
3027 #define FF_PROFILE_VP9_2 2
3028 #define FF_PROFILE_VP9_3 3
3030 #define FF_PROFILE_HEVC_MAIN 1
3031 #define FF_PROFILE_HEVC_MAIN_10 2
3032 #define FF_PROFILE_HEVC_MAIN_STILL_PICTURE 3
3033 #define FF_PROFILE_HEVC_REXT 4
3035 #define FF_PROFILE_AV1_MAIN 0
3036 #define FF_PROFILE_AV1_HIGH 1
3037 #define FF_PROFILE_AV1_PROFESSIONAL 2
3039 #define FF_PROFILE_MJPEG_HUFFMAN_BASELINE_DCT 0xc0
3040 #define FF_PROFILE_MJPEG_HUFFMAN_EXTENDED_SEQUENTIAL_DCT 0xc1
3041 #define FF_PROFILE_MJPEG_HUFFMAN_PROGRESSIVE_DCT 0xc2
3042 #define FF_PROFILE_MJPEG_HUFFMAN_LOSSLESS 0xc3
3043 #define FF_PROFILE_MJPEG_JPEG_LS 0xf7
3045 #define FF_PROFILE_SBC_MSBC 1
3047 #define FF_PROFILE_PRORES_PROXY 0
3048 #define FF_PROFILE_PRORES_LT 1
3049 #define FF_PROFILE_PRORES_STANDARD 2
3050 #define FF_PROFILE_PRORES_HQ 3
3051 #define FF_PROFILE_PRORES_4444 4
3052 #define FF_PROFILE_PRORES_XQ 5
3054 #define FF_PROFILE_ARIB_PROFILE_A 0
3055 #define FF_PROFILE_ARIB_PROFILE_C 1
3059 * - encoding: Set by user.
3060 * - decoding: Set by libavcodec.
3063 #define FF_LEVEL_UNKNOWN -99
3066 * Skip loop filtering for selected frames.
3067 * - encoding: unused
3068 * - decoding: Set by user.
3070 enum AVDiscard skip_loop_filter;
3073 * Skip IDCT/dequantization for selected frames.
3074 * - encoding: unused
3075 * - decoding: Set by user.
3077 enum AVDiscard skip_idct;
3080 * Skip decoding for selected frames.
3081 * - encoding: unused
3082 * - decoding: Set by user.
3084 enum AVDiscard skip_frame;
3087 * Header containing style information for text subtitles.
3088 * For SUBTITLE_ASS subtitle type, it should contain the whole ASS
3089 * [Script Info] and [V4+ Styles] section, plus the [Events] line and
3090 * the Format line following. It shouldn't include any Dialogue line.
3091 * - encoding: Set/allocated/freed by user (before avcodec_open2())
3092 * - decoding: Set/allocated/freed by libavcodec (by avcodec_open2())
3094 uint8_t *subtitle_header;
3095 int subtitle_header_size;
3097 #if FF_API_VBV_DELAY
3099 * VBV delay coded in the last frame (in periods of a 27 MHz clock).
3100 * Used for compliant TS muxing.
3101 * - encoding: Set by libavcodec.
3102 * - decoding: unused.
3103 * @deprecated this value is now exported as a part of
3104 * AV_PKT_DATA_CPB_PROPERTIES packet side data
3106 attribute_deprecated
3110 #if FF_API_SIDEDATA_ONLY_PKT
3112 * Encoding only and set by default. Allow encoders to output packets
3113 * that do not contain any encoded data, only side data.
3115 * Some encoders need to output such packets, e.g. to update some stream
3116 * parameters at the end of encoding.
3118 * @deprecated this field disables the default behaviour and
3119 * it is kept only for compatibility.
3121 attribute_deprecated
3122 int side_data_only_packets;
3126 * Audio only. The number of "priming" samples (padding) inserted by the
3127 * encoder at the beginning of the audio. I.e. this number of leading
3128 * decoded samples must be discarded by the caller to get the original audio
3129 * without leading padding.
3131 * - decoding: unused
3132 * - encoding: Set by libavcodec. The timestamps on the output packets are
3133 * adjusted by the encoder so that they always refer to the
3134 * first sample of the data actually contained in the packet,
3135 * including any added padding. E.g. if the timebase is
3136 * 1/samplerate and the timestamp of the first input sample is
3137 * 0, the timestamp of the first output packet will be
3140 int initial_padding;
3143 * - decoding: For codecs that store a framerate value in the compressed
3144 * bitstream, the decoder may export it here. { 0, 1} when
3146 * - encoding: May be used to signal the framerate of CFR content to an
3149 AVRational framerate;
3152 * Nominal unaccelerated pixel format, see AV_PIX_FMT_xxx.
3153 * - encoding: unused.
3154 * - decoding: Set by libavcodec before calling get_format()
3156 enum AVPixelFormat sw_pix_fmt;
3159 * Timebase in which pkt_dts/pts and AVPacket.dts/pts are.
3160 * - encoding unused.
3161 * - decoding set by user.
3163 AVRational pkt_timebase;
3167 * - encoding: unused.
3168 * - decoding: set by libavcodec.
3170 const AVCodecDescriptor *codec_descriptor;
3174 * low resolution decoding, 1-> 1/2 size, 2->1/4 size
3175 * - encoding: unused
3176 * - decoding: Set by user.
3182 * Current statistics for PTS correction.
3183 * - decoding: maintained and used by libavcodec, not intended to be used by user apps
3184 * - encoding: unused
3186 int64_t pts_correction_num_faulty_pts; /// Number of incorrect PTS values so far
3187 int64_t pts_correction_num_faulty_dts; /// Number of incorrect DTS values so far
3188 int64_t pts_correction_last_pts; /// PTS of the last frame
3189 int64_t pts_correction_last_dts; /// DTS of the last frame
3192 * Character encoding of the input subtitles file.
3193 * - decoding: set by user
3194 * - encoding: unused
3199 * Subtitles character encoding mode. Formats or codecs might be adjusting
3200 * this setting (if they are doing the conversion themselves for instance).
3201 * - decoding: set by libavcodec
3202 * - encoding: unused
3204 int sub_charenc_mode;
3205 #define FF_SUB_CHARENC_MODE_DO_NOTHING -1 ///< do nothing (demuxer outputs a stream supposed to be already in UTF-8, or the codec is bitmap for instance)
3206 #define FF_SUB_CHARENC_MODE_AUTOMATIC 0 ///< libavcodec will select the mode itself
3207 #define FF_SUB_CHARENC_MODE_PRE_DECODER 1 ///< the AVPacket data needs to be recoded to UTF-8 before being fed to the decoder, requires iconv
3208 #define FF_SUB_CHARENC_MODE_IGNORE 2 ///< neither convert the subtitles, nor check them for valid UTF-8
3211 * Skip processing alpha if supported by codec.
3212 * Note that if the format uses pre-multiplied alpha (common with VP6,
3213 * and recommended due to better video quality/compression)
3214 * the image will look as if alpha-blended onto a black background.
3215 * However for formats that do not use pre-multiplied alpha
3216 * there might be serious artefacts (though e.g. libswscale currently
3217 * assumes pre-multiplied alpha anyway).
3219 * - decoding: set by user
3220 * - encoding: unused
3225 * Number of samples to skip after a discontinuity
3226 * - decoding: unused
3227 * - encoding: set by libavcodec
3231 #if !FF_API_DEBUG_MV
3233 * debug motion vectors
3234 * - encoding: Set by user.
3235 * - decoding: Set by user.
3238 #define FF_DEBUG_VIS_MV_P_FOR 0x00000001 //visualize forward predicted MVs of P frames
3239 #define FF_DEBUG_VIS_MV_B_FOR 0x00000002 //visualize forward predicted MVs of B frames
3240 #define FF_DEBUG_VIS_MV_B_BACK 0x00000004 //visualize backward predicted MVs of B frames
3244 * custom intra quantization matrix
3245 * - encoding: Set by user, can be NULL.
3246 * - decoding: unused.
3248 uint16_t *chroma_intra_matrix;
3251 * dump format separator.
3252 * can be ", " or "\n " or anything else
3253 * - encoding: Set by user.
3254 * - decoding: Set by user.
3256 uint8_t *dump_separator;
3259 * ',' separated list of allowed decoders.
3260 * If NULL then all are allowed
3261 * - encoding: unused
3262 * - decoding: set by user
3264 char *codec_whitelist;
3267 * Properties of the stream that gets decoded
3268 * - encoding: unused
3269 * - decoding: set by libavcodec
3271 unsigned properties;
3272 #define FF_CODEC_PROPERTY_LOSSLESS 0x00000001
3273 #define FF_CODEC_PROPERTY_CLOSED_CAPTIONS 0x00000002
3276 * Additional data associated with the entire coded stream.
3278 * - decoding: unused
3279 * - encoding: may be set by libavcodec after avcodec_open2().
3281 AVPacketSideData *coded_side_data;
3282 int nb_coded_side_data;
3285 * A reference to the AVHWFramesContext describing the input (for encoding)
3286 * or output (decoding) frames. The reference is set by the caller and
3287 * afterwards owned (and freed) by libavcodec - it should never be read by
3288 * the caller after being set.
3290 * - decoding: This field should be set by the caller from the get_format()
3291 * callback. The previous reference (if any) will always be
3292 * unreffed by libavcodec before the get_format() call.
3294 * If the default get_buffer2() is used with a hwaccel pixel
3295 * format, then this AVHWFramesContext will be used for
3296 * allocating the frame buffers.
3298 * - encoding: For hardware encoders configured to use a hwaccel pixel
3299 * format, this field should be set by the caller to a reference
3300 * to the AVHWFramesContext describing input frames.
3301 * AVHWFramesContext.format must be equal to
3302 * AVCodecContext.pix_fmt.
3304 * This field should be set before avcodec_open2() is called.
3306 AVBufferRef *hw_frames_ctx;
3309 * Control the form of AVSubtitle.rects[N]->ass
3310 * - decoding: set by user
3311 * - encoding: unused
3313 int sub_text_format;
3314 #define FF_SUB_TEXT_FMT_ASS 0
3315 #if FF_API_ASS_TIMING
3316 #define FF_SUB_TEXT_FMT_ASS_WITH_TIMINGS 1
3320 * Audio only. The amount of padding (in samples) appended by the encoder to
3321 * the end of the audio. I.e. this number of decoded samples must be
3322 * discarded by the caller from the end of the stream to get the original
3323 * audio without any trailing padding.
3325 * - decoding: unused
3326 * - encoding: unused
3328 int trailing_padding;
3331 * The number of pixels per image to maximally accept.
3333 * - decoding: set by user
3334 * - encoding: set by user
3339 * A reference to the AVHWDeviceContext describing the device which will
3340 * be used by a hardware encoder/decoder. The reference is set by the
3341 * caller and afterwards owned (and freed) by libavcodec.
3343 * This should be used if either the codec device does not require
3344 * hardware frames or any that are used are to be allocated internally by
3345 * libavcodec. If the user wishes to supply any of the frames used as
3346 * encoder input or decoder output then hw_frames_ctx should be used
3347 * instead. When hw_frames_ctx is set in get_format() for a decoder, this
3348 * field will be ignored while decoding the associated stream segment, but
3349 * may again be used on a following one after another get_format() call.
3351 * For both encoders and decoders this field should be set before
3352 * avcodec_open2() is called and must not be written to thereafter.
3354 * Note that some decoders may require this field to be set initially in
3355 * order to support hw_frames_ctx at all - in that case, all frames
3356 * contexts used must be created on the same device.
3358 AVBufferRef *hw_device_ctx;
3361 * Bit set of AV_HWACCEL_FLAG_* flags, which affect hardware accelerated
3362 * decoding (if active).
3363 * - encoding: unused
3364 * - decoding: Set by user (either before avcodec_open2(), or in the
3365 * AVCodecContext.get_format callback)
3370 * Video decoding only. Certain video codecs support cropping, meaning that
3371 * only a sub-rectangle of the decoded frame is intended for display. This
3372 * option controls how cropping is handled by libavcodec.
3374 * When set to 1 (the default), libavcodec will apply cropping internally.
3375 * I.e. it will modify the output frame width/height fields and offset the
3376 * data pointers (only by as much as possible while preserving alignment, or
3377 * by the full amount if the AV_CODEC_FLAG_UNALIGNED flag is set) so that
3378 * the frames output by the decoder refer only to the cropped area. The
3379 * crop_* fields of the output frames will be zero.
3381 * When set to 0, the width/height fields of the output frames will be set
3382 * to the coded dimensions and the crop_* fields will describe the cropping
3383 * rectangle. Applying the cropping is left to the caller.
3385 * @warning When hardware acceleration with opaque output frames is used,
3386 * libavcodec is unable to apply cropping from the top/left border.
3388 * @note when this option is set to zero, the width/height fields of the
3389 * AVCodecContext and output AVFrames have different meanings. The codec
3390 * context fields store display dimensions (with the coded dimensions in
3391 * coded_width/height), while the frame fields store the coded dimensions
3392 * (with the display dimensions being determined by the crop_* fields).
3397 * Video decoding only. Sets the number of extra hardware frames which
3398 * the decoder will allocate for use by the caller. This must be set
3399 * before avcodec_open2() is called.
3401 * Some hardware decoders require all frames that they will use for
3402 * output to be defined in advance before decoding starts. For such
3403 * decoders, the hardware frame pool must therefore be of a fixed size.
3404 * The extra frames set here are on top of any number that the decoder
3405 * needs internally in order to operate normally (for example, frames
3406 * used as reference pictures).
3408 int extra_hw_frames;
3411 * The percentage of damaged samples to discard a frame.
3413 * - decoding: set by user
3414 * - encoding: unused
3416 int discard_damaged_percentage;
3419 * The number of samples per frame to maximally accept.
3421 * - decoding: set by user
3422 * - encoding: set by user
3424 int64_t max_samples;
3427 * Bit set of AV_CODEC_EXPORT_DATA_* flags, which affects the kind of
3428 * metadata exported in frame, packet, or coded stream side data by
3429 * decoders and encoders.
3431 * - decoding: set by user
3432 * - encoding: set by user
3434 int export_side_data;
3437 #if FF_API_CODEC_GET_SET
3439 * Accessors for some AVCodecContext fields. These used to be provided for ABI
3440 * compatibility, and do not need to be used anymore.
3442 attribute_deprecated
3443 AVRational av_codec_get_pkt_timebase (const AVCodecContext *avctx);
3444 attribute_deprecated
3445 void av_codec_set_pkt_timebase (AVCodecContext *avctx, AVRational val);
3447 attribute_deprecated
3448 const AVCodecDescriptor *av_codec_get_codec_descriptor(const AVCodecContext *avctx);
3449 attribute_deprecated
3450 void av_codec_set_codec_descriptor(AVCodecContext *avctx, const AVCodecDescriptor *desc);
3452 attribute_deprecated
3453 unsigned av_codec_get_codec_properties(const AVCodecContext *avctx);
3456 attribute_deprecated
3457 int av_codec_get_lowres(const AVCodecContext *avctx);
3458 attribute_deprecated
3459 void av_codec_set_lowres(AVCodecContext *avctx, int val);
3462 attribute_deprecated
3463 int av_codec_get_seek_preroll(const AVCodecContext *avctx);
3464 attribute_deprecated
3465 void av_codec_set_seek_preroll(AVCodecContext *avctx, int val);
3467 attribute_deprecated
3468 uint16_t *av_codec_get_chroma_intra_matrix(const AVCodecContext *avctx);
3469 attribute_deprecated
3470 void av_codec_set_chroma_intra_matrix(AVCodecContext *avctx, uint16_t *val);
3476 typedef struct AVProfile {
3478 const char *name; ///< short name for the profile
3483 * The codec supports this format via the hw_device_ctx interface.
3485 * When selecting this format, AVCodecContext.hw_device_ctx should
3486 * have been set to a device of the specified type before calling
3489 AV_CODEC_HW_CONFIG_METHOD_HW_DEVICE_CTX = 0x01,
3491 * The codec supports this format via the hw_frames_ctx interface.
3493 * When selecting this format for a decoder,
3494 * AVCodecContext.hw_frames_ctx should be set to a suitable frames
3495 * context inside the get_format() callback. The frames context
3496 * must have been created on a device of the specified type.
3498 AV_CODEC_HW_CONFIG_METHOD_HW_FRAMES_CTX = 0x02,
3500 * The codec supports this format by some internal method.
3502 * This format can be selected without any additional configuration -
3503 * no device or frames context is required.
3505 AV_CODEC_HW_CONFIG_METHOD_INTERNAL = 0x04,
3507 * The codec supports this format by some ad-hoc method.
3509 * Additional settings and/or function calls are required. See the
3510 * codec-specific documentation for details. (Methods requiring
3511 * this sort of configuration are deprecated and others should be
3512 * used in preference.)
3514 AV_CODEC_HW_CONFIG_METHOD_AD_HOC = 0x08,
3517 typedef struct AVCodecHWConfig {
3519 * A hardware pixel format which the codec can use.
3521 enum AVPixelFormat pix_fmt;
3523 * Bit set of AV_CODEC_HW_CONFIG_METHOD_* flags, describing the possible
3524 * setup methods which can be used with this configuration.
3528 * The device type associated with the configuration.
3530 * Must be set for AV_CODEC_HW_CONFIG_METHOD_HW_DEVICE_CTX and
3531 * AV_CODEC_HW_CONFIG_METHOD_HW_FRAMES_CTX, otherwise unused.
3533 enum AVHWDeviceType device_type;
3536 typedef struct AVCodecDefault AVCodecDefault;
3543 typedef struct AVCodec {
3545 * Name of the codec implementation.
3546 * The name is globally unique among encoders and among decoders (but an
3547 * encoder and a decoder can share the same name).
3548 * This is the primary way to find a codec from the user perspective.
3552 * Descriptive name for the codec, meant to be more human readable than name.
3553 * You should use the NULL_IF_CONFIG_SMALL() macro to define it.
3555 const char *long_name;
3556 enum AVMediaType type;
3559 * Codec capabilities.
3560 * see AV_CODEC_CAP_*
3563 const AVRational *supported_framerates; ///< array of supported framerates, or NULL if any, array is terminated by {0,0}
3564 const enum AVPixelFormat *pix_fmts; ///< array of supported pixel formats, or NULL if unknown, array is terminated by -1
3565 const int *supported_samplerates; ///< array of supported audio samplerates, or NULL if unknown, array is terminated by 0
3566 const enum AVSampleFormat *sample_fmts; ///< array of supported sample formats, or NULL if unknown, array is terminated by -1
3567 const uint64_t *channel_layouts; ///< array of support channel layouts, or NULL if unknown. array is terminated by 0
3568 uint8_t max_lowres; ///< maximum value for lowres supported by the decoder
3569 const AVClass *priv_class; ///< AVClass for the private context
3570 const AVProfile *profiles; ///< array of recognized profiles, or NULL if unknown, array is terminated by {FF_PROFILE_UNKNOWN}
3573 * Group name of the codec implementation.
3574 * This is a short symbolic name of the wrapper backing this codec. A
3575 * wrapper uses some kind of external implementation for the codec, such
3576 * as an external library, or a codec implementation provided by the OS or
3578 * If this field is NULL, this is a builtin, libavcodec native codec.
3579 * If non-NULL, this will be the suffix in AVCodec.name in most cases
3580 * (usually AVCodec.name will be of the form "<codec_name>_<wrapper_name>").
3582 const char *wrapper_name;
3584 /*****************************************************************
3585 * No fields below this line are part of the public API. They
3586 * may not be used outside of libavcodec and can be changed and
3588 * New public fields should be added right above.
3589 *****************************************************************
3592 struct AVCodec *next;
3594 * @name Frame-level threading support functions
3598 * If defined, called on thread contexts when they are created.
3599 * If the codec allocates writable tables in init(), re-allocate them here.
3600 * priv_data will be set to a copy of the original.
3602 int (*init_thread_copy)(AVCodecContext *);
3604 * Copy necessary context variables from a previous thread context to the current one.
3605 * If not defined, the next thread will start automatically; otherwise, the codec
3606 * must call ff_thread_finish_setup().
3608 * dst and src will (rarely) point to the same context, in which case memcpy should be skipped.
3610 int (*update_thread_context)(AVCodecContext *dst, const AVCodecContext *src);
3614 * Private codec-specific defaults.
3616 const AVCodecDefault *defaults;
3619 * Initialize codec static data, called from avcodec_register().
3621 * This is not intended for time consuming operations as it is
3622 * run for every codec regardless of that codec being used.
3624 void (*init_static_data)(struct AVCodec *codec);
3626 int (*init)(AVCodecContext *);
3627 int (*encode_sub)(AVCodecContext *, uint8_t *buf, int buf_size,
3628 const struct AVSubtitle *sub);
3630 * Encode data to an AVPacket.
3632 * @param avctx codec context
3633 * @param avpkt output AVPacket (may contain a user-provided buffer)
3634 * @param[in] frame AVFrame containing the raw data to be encoded
3635 * @param[out] got_packet_ptr encoder sets to 0 or 1 to indicate that a
3636 * non-empty packet was returned in avpkt.
3637 * @return 0 on success, negative error code on failure
3639 int (*encode2)(AVCodecContext *avctx, AVPacket *avpkt, const AVFrame *frame,
3640 int *got_packet_ptr);
3641 int (*decode)(AVCodecContext *, void *outdata, int *outdata_size, AVPacket *avpkt);
3642 int (*close)(AVCodecContext *);
3644 * Encode API with decoupled packet/frame dataflow. The API is the
3645 * same as the avcodec_ prefixed APIs (avcodec_send_frame() etc.), except
3647 * - never called if the codec is closed or the wrong type,
3648 * - if AV_CODEC_CAP_DELAY is not set, drain frames are never sent,
3649 * - only one drain frame is ever passed down,
3651 int (*send_frame)(AVCodecContext *avctx, const AVFrame *frame);
3652 int (*receive_packet)(AVCodecContext *avctx, AVPacket *avpkt);
3655 * Decode API with decoupled packet/frame dataflow. This function is called
3656 * to get one output frame. It should call ff_decode_get_packet() to obtain
3659 int (*receive_frame)(AVCodecContext *avctx, AVFrame *frame);
3662 * Will be called when seeking
3664 void (*flush)(AVCodecContext *);
3666 * Internal codec capabilities.
3667 * See FF_CODEC_CAP_* in internal.h
3672 * Decoding only, a comma-separated list of bitstream filters to apply to
3673 * packets before decoding.
3678 * Array of pointers to hardware configurations supported by the codec,
3679 * or NULL if no hardware supported. The array is terminated by a NULL
3682 * The user can only access this field via avcodec_get_hw_config().
3684 const struct AVCodecHWConfigInternal **hw_configs;
3687 * List of supported codec_tags, terminated by FF_CODEC_TAGS_END.
3689 const uint32_t *codec_tags;
3692 #if FF_API_CODEC_GET_SET
3693 attribute_deprecated
3694 int av_codec_get_max_lowres(const AVCodec *codec);
3697 struct MpegEncContext;
3700 * Retrieve supported hardware configurations for a codec.
3702 * Values of index from zero to some maximum return the indexed configuration
3703 * descriptor; all other values return NULL. If the codec does not support
3704 * any hardware configurations then it will always return NULL.
3706 const AVCodecHWConfig *avcodec_get_hw_config(const AVCodec *codec, int index);
3709 * @defgroup lavc_hwaccel AVHWAccel
3711 * @note Nothing in this structure should be accessed by the user. At some
3712 * point in future it will not be externally visible at all.
3716 typedef struct AVHWAccel {
3718 * Name of the hardware accelerated codec.
3719 * The name is globally unique among encoders and among decoders (but an
3720 * encoder and a decoder can share the same name).
3725 * Type of codec implemented by the hardware accelerator.
3727 * See AVMEDIA_TYPE_xxx
3729 enum AVMediaType type;
3732 * Codec implemented by the hardware accelerator.
3734 * See AV_CODEC_ID_xxx
3739 * Supported pixel format.
3741 * Only hardware accelerated formats are supported here.
3743 enum AVPixelFormat pix_fmt;
3746 * Hardware accelerated codec capabilities.
3747 * see AV_HWACCEL_CODEC_CAP_*
3751 /*****************************************************************
3752 * No fields below this line are part of the public API. They
3753 * may not be used outside of libavcodec and can be changed and
3755 * New public fields should be added right above.
3756 *****************************************************************
3760 * Allocate a custom buffer
3762 int (*alloc_frame)(AVCodecContext *avctx, AVFrame *frame);
3765 * Called at the beginning of each frame or field picture.
3767 * Meaningful frame information (codec specific) is guaranteed to
3768 * be parsed at this point. This function is mandatory.
3770 * Note that buf can be NULL along with buf_size set to 0.
3771 * Otherwise, this means the whole frame is available at this point.
3773 * @param avctx the codec context
3774 * @param buf the frame data buffer base
3775 * @param buf_size the size of the frame in bytes
3776 * @return zero if successful, a negative value otherwise
3778 int (*start_frame)(AVCodecContext *avctx, const uint8_t *buf, uint32_t buf_size);
3781 * Callback for parameter data (SPS/PPS/VPS etc).
3783 * Useful for hardware decoders which keep persistent state about the
3784 * video parameters, and need to receive any changes to update that state.
3786 * @param avctx the codec context
3787 * @param type the nal unit type
3788 * @param buf the nal unit data buffer
3789 * @param buf_size the size of the nal unit in bytes
3790 * @return zero if successful, a negative value otherwise
3792 int (*decode_params)(AVCodecContext *avctx, int type, const uint8_t *buf, uint32_t buf_size);
3795 * Callback for each slice.
3797 * Meaningful slice information (codec specific) is guaranteed to
3798 * be parsed at this point. This function is mandatory.
3799 * The only exception is XvMC, that works on MB level.
3801 * @param avctx the codec context
3802 * @param buf the slice data buffer base
3803 * @param buf_size the size of the slice in bytes
3804 * @return zero if successful, a negative value otherwise
3806 int (*decode_slice)(AVCodecContext *avctx, const uint8_t *buf, uint32_t buf_size);
3809 * Called at the end of each frame or field picture.
3811 * The whole picture is parsed at this point and can now be sent
3812 * to the hardware accelerator. This function is mandatory.
3814 * @param avctx the codec context
3815 * @return zero if successful, a negative value otherwise
3817 int (*end_frame)(AVCodecContext *avctx);
3820 * Size of per-frame hardware accelerator private data.
3822 * Private data is allocated with av_mallocz() before
3823 * AVCodecContext.get_buffer() and deallocated after
3824 * AVCodecContext.release_buffer().
3826 int frame_priv_data_size;
3829 * Called for every Macroblock in a slice.
3831 * XvMC uses it to replace the ff_mpv_reconstruct_mb().
3832 * Instead of decoding to raw picture, MB parameters are
3833 * stored in an array provided by the video driver.
3835 * @param s the mpeg context
3837 void (*decode_mb)(struct MpegEncContext *s);
3840 * Initialize the hwaccel private data.
3842 * This will be called from ff_get_format(), after hwaccel and
3843 * hwaccel_context are set and the hwaccel private data in AVCodecInternal
3846 int (*init)(AVCodecContext *avctx);
3849 * Uninitialize the hwaccel private data.
3851 * This will be called from get_format() or avcodec_close(), after hwaccel
3852 * and hwaccel_context are already uninitialized.
3854 int (*uninit)(AVCodecContext *avctx);
3857 * Size of the private data to allocate in
3858 * AVCodecInternal.hwaccel_priv_data.
3863 * Internal hwaccel capabilities.
3868 * Fill the given hw_frames context with current codec parameters. Called
3869 * from get_format. Refer to avcodec_get_hw_frames_parameters() for
3872 * This CAN be called before AVHWAccel.init is called, and you must assume
3873 * that avctx->hwaccel_priv_data is invalid.
3875 int (*frame_params)(AVCodecContext *avctx, AVBufferRef *hw_frames_ctx);
3879 * HWAccel is experimental and is thus avoided in favor of non experimental
3882 #define AV_HWACCEL_CODEC_CAP_EXPERIMENTAL 0x0200
3885 * Hardware acceleration should be used for decoding even if the codec level
3886 * used is unknown or higher than the maximum supported level reported by the
3889 * It's generally a good idea to pass this flag unless you have a specific
3890 * reason not to, as hardware tends to under-report supported levels.
3892 #define AV_HWACCEL_FLAG_IGNORE_LEVEL (1 << 0)
3895 * Hardware acceleration can output YUV pixel formats with a different chroma
3896 * sampling than 4:2:0 and/or other than 8 bits per component.
3898 #define AV_HWACCEL_FLAG_ALLOW_HIGH_DEPTH (1 << 1)
3901 * Hardware acceleration should still be attempted for decoding when the
3902 * codec profile does not match the reported capabilities of the hardware.
3904 * For example, this can be used to try to decode baseline profile H.264
3905 * streams in hardware - it will often succeed, because many streams marked
3906 * as baseline profile actually conform to constrained baseline profile.
3908 * @warning If the stream is actually not supported then the behaviour is
3909 * undefined, and may include returning entirely incorrect output
3910 * while indicating success.
3912 #define AV_HWACCEL_FLAG_ALLOW_PROFILE_MISMATCH (1 << 2)
3918 #if FF_API_AVPICTURE
3920 * @defgroup lavc_picture AVPicture
3922 * Functions for working with AVPicture
3927 * Picture data structure.
3929 * Up to four components can be stored into it, the last component is
3931 * @deprecated use AVFrame or imgutils functions instead
3933 typedef struct AVPicture {
3934 attribute_deprecated
3935 uint8_t *data[AV_NUM_DATA_POINTERS]; ///< pointers to the image data planes
3936 attribute_deprecated
3937 int linesize[AV_NUM_DATA_POINTERS]; ///< number of bytes per line
3945 enum AVSubtitleType {
3948 SUBTITLE_BITMAP, ///< A bitmap, pict will be set
3951 * Plain text, the text field must be set by the decoder and is
3952 * authoritative. ass and pict fields may contain approximations.
3957 * Formatted text, the ass field must be set by the decoder and is
3958 * authoritative. pict and text fields may contain approximations.
3963 #define AV_SUBTITLE_FLAG_FORCED 0x00000001
3965 typedef struct AVSubtitleRect {
3966 int x; ///< top left corner of pict, undefined when pict is not set
3967 int y; ///< top left corner of pict, undefined when pict is not set
3968 int w; ///< width of pict, undefined when pict is not set
3969 int h; ///< height of pict, undefined when pict is not set
3970 int nb_colors; ///< number of colors in pict, undefined when pict is not set
3972 #if FF_API_AVPICTURE
3974 * @deprecated unused
3976 attribute_deprecated
3980 * data+linesize for the bitmap of this subtitle.
3981 * Can be set for text/ass as well once they are rendered.
3986 enum AVSubtitleType type;
3988 char *text; ///< 0 terminated plain UTF-8 text
3991 * 0 terminated ASS/SSA compatible event line.
3992 * The presentation of this is unaffected by the other values in this
4000 typedef struct AVSubtitle {
4001 uint16_t format; /* 0 = graphics */
4002 uint32_t start_display_time; /* relative to packet pts, in ms */
4003 uint32_t end_display_time; /* relative to packet pts, in ms */
4005 AVSubtitleRect **rects;
4006 int64_t pts; ///< Same as packet pts, in AV_TIME_BASE
4010 * This struct describes the properties of an encoded stream.
4012 * sizeof(AVCodecParameters) is not a part of the public ABI, this struct must
4013 * be allocated with avcodec_parameters_alloc() and freed with
4014 * avcodec_parameters_free().
4016 typedef struct AVCodecParameters {
4018 * General type of the encoded data.
4020 enum AVMediaType codec_type;
4022 * Specific type of the encoded data (the codec used).
4024 enum AVCodecID codec_id;
4026 * Additional information about the codec (corresponds to the AVI FOURCC).
4031 * Extra binary data needed for initializing the decoder, codec-dependent.
4033 * Must be allocated with av_malloc() and will be freed by
4034 * avcodec_parameters_free(). The allocated size of extradata must be at
4035 * least extradata_size + AV_INPUT_BUFFER_PADDING_SIZE, with the padding
4040 * Size of the extradata content in bytes.
4045 * - video: the pixel format, the value corresponds to enum AVPixelFormat.
4046 * - audio: the sample format, the value corresponds to enum AVSampleFormat.
4051 * The average bitrate of the encoded data (in bits per second).
4056 * The number of bits per sample in the codedwords.
4058 * This is basically the bitrate per sample. It is mandatory for a bunch of
4059 * formats to actually decode them. It's the number of bits for one sample in
4060 * the actual coded bitstream.
4062 * This could be for example 4 for ADPCM
4063 * For PCM formats this matches bits_per_raw_sample
4066 int bits_per_coded_sample;
4069 * This is the number of valid bits in each output sample. If the
4070 * sample format has more bits, the least significant bits are additional
4071 * padding bits, which are always 0. Use right shifts to reduce the sample
4072 * to its actual size. For example, audio formats with 24 bit samples will
4073 * have bits_per_raw_sample set to 24, and format set to AV_SAMPLE_FMT_S32.
4074 * To get the original sample use "(int32_t)sample >> 8"."
4076 * For ADPCM this might be 12 or 16 or similar
4079 int bits_per_raw_sample;
4082 * Codec-specific bitstream restrictions that the stream conforms to.
4088 * Video only. The dimensions of the video frame in pixels.
4094 * Video only. The aspect ratio (width / height) which a single pixel
4095 * should have when displayed.
4097 * When the aspect ratio is unknown / undefined, the numerator should be
4098 * set to 0 (the denominator may have any value).
4100 AVRational sample_aspect_ratio;
4103 * Video only. The order of the fields in interlaced video.
4105 enum AVFieldOrder field_order;
4108 * Video only. Additional colorspace characteristics.
4110 enum AVColorRange color_range;
4111 enum AVColorPrimaries color_primaries;
4112 enum AVColorTransferCharacteristic color_trc;
4113 enum AVColorSpace color_space;
4114 enum AVChromaLocation chroma_location;
4117 * Video only. Number of delayed frames.
4122 * Audio only. The channel layout bitmask. May be 0 if the channel layout is
4123 * unknown or unspecified, otherwise the number of bits set must be equal to
4124 * the channels field.
4126 uint64_t channel_layout;
4128 * Audio only. The number of audio channels.
4132 * Audio only. The number of audio samples per second.
4136 * Audio only. The number of bytes per coded audio frame, required by some
4139 * Corresponds to nBlockAlign in WAVEFORMATEX.
4143 * Audio only. Audio frame size, if known. Required by some formats to be static.
4148 * Audio only. The amount of padding (in samples) inserted by the encoder at
4149 * the beginning of the audio. I.e. this number of leading decoded samples
4150 * must be discarded by the caller to get the original audio without leading
4153 int initial_padding;
4155 * Audio only. The amount of padding (in samples) appended by the encoder to
4156 * the end of the audio. I.e. this number of decoded samples must be
4157 * discarded by the caller from the end of the stream to get the original
4158 * audio without any trailing padding.
4160 int trailing_padding;
4162 * Audio only. Number of samples to skip after a discontinuity.
4165 } AVCodecParameters;
4168 * Iterate over all registered codecs.
4170 * @param opaque a pointer where libavcodec will store the iteration state. Must
4171 * point to NULL to start the iteration.
4173 * @return the next registered codec or NULL when the iteration is
4176 const AVCodec *av_codec_iterate(void **opaque);
4180 * If c is NULL, returns the first registered codec,
4181 * if c is non-NULL, returns the next registered codec after c,
4182 * or NULL if c is the last one.
4184 attribute_deprecated
4185 AVCodec *av_codec_next(const AVCodec *c);
4189 * Return the LIBAVCODEC_VERSION_INT constant.
4191 unsigned avcodec_version(void);
4194 * Return the libavcodec build-time configuration.
4196 const char *avcodec_configuration(void);
4199 * Return the libavcodec license.
4201 const char *avcodec_license(void);
4205 * Register the codec codec and initialize libavcodec.
4207 * @warning either this function or avcodec_register_all() must be called
4208 * before any other libavcodec functions.
4210 * @see avcodec_register_all()
4212 attribute_deprecated
4213 void avcodec_register(AVCodec *codec);
4216 * Register all the codecs, parsers and bitstream filters which were enabled at
4217 * configuration time. If you do not call this function you can select exactly
4218 * which formats you want to support, by using the individual registration
4221 * @see avcodec_register
4222 * @see av_register_codec_parser
4223 * @see av_register_bitstream_filter
4225 attribute_deprecated
4226 void avcodec_register_all(void);
4230 * Allocate an AVCodecContext and set its fields to default values. The
4231 * resulting struct should be freed with avcodec_free_context().
4233 * @param codec if non-NULL, allocate private data and initialize defaults
4234 * for the given codec. It is illegal to then call avcodec_open2()
4235 * with a different codec.
4236 * If NULL, then the codec-specific defaults won't be initialized,
4237 * which may result in suboptimal default settings (this is
4238 * important mainly for encoders, e.g. libx264).
4240 * @return An AVCodecContext filled with default values or NULL on failure.
4242 AVCodecContext *avcodec_alloc_context3(const AVCodec *codec);
4245 * Free the codec context and everything associated with it and write NULL to
4246 * the provided pointer.
4248 void avcodec_free_context(AVCodecContext **avctx);
4250 #if FF_API_GET_CONTEXT_DEFAULTS
4252 * @deprecated This function should not be used, as closing and opening a codec
4253 * context multiple time is not supported. A new codec context should be
4254 * allocated for each new use.
4256 int avcodec_get_context_defaults3(AVCodecContext *s, const AVCodec *codec);
4260 * Get the AVClass for AVCodecContext. It can be used in combination with
4261 * AV_OPT_SEARCH_FAKE_OBJ for examining options.
4263 * @see av_opt_find().
4265 const AVClass *avcodec_get_class(void);
4267 #if FF_API_COPY_CONTEXT
4269 * Get the AVClass for AVFrame. It can be used in combination with
4270 * AV_OPT_SEARCH_FAKE_OBJ for examining options.
4272 * @see av_opt_find().
4274 const AVClass *avcodec_get_frame_class(void);
4277 * Get the AVClass for AVSubtitleRect. It can be used in combination with
4278 * AV_OPT_SEARCH_FAKE_OBJ for examining options.
4280 * @see av_opt_find().
4282 const AVClass *avcodec_get_subtitle_rect_class(void);
4285 * Copy the settings of the source AVCodecContext into the destination
4286 * AVCodecContext. The resulting destination codec context will be
4287 * unopened, i.e. you are required to call avcodec_open2() before you
4288 * can use this AVCodecContext to decode/encode video/audio data.
4290 * @param dest target codec context, should be initialized with
4291 * avcodec_alloc_context3(NULL), but otherwise uninitialized
4292 * @param src source codec context
4293 * @return AVERROR() on error (e.g. memory allocation error), 0 on success
4295 * @deprecated The semantics of this function are ill-defined and it should not
4296 * be used. If you need to transfer the stream parameters from one codec context
4297 * to another, use an intermediate AVCodecParameters instance and the
4298 * avcodec_parameters_from_context() / avcodec_parameters_to_context()
4301 attribute_deprecated
4302 int avcodec_copy_context(AVCodecContext *dest, const AVCodecContext *src);
4306 * Allocate a new AVCodecParameters and set its fields to default values
4307 * (unknown/invalid/0). The returned struct must be freed with
4308 * avcodec_parameters_free().
4310 AVCodecParameters *avcodec_parameters_alloc(void);
4313 * Free an AVCodecParameters instance and everything associated with it and
4314 * write NULL to the supplied pointer.
4316 void avcodec_parameters_free(AVCodecParameters **par);
4319 * Copy the contents of src to dst. Any allocated fields in dst are freed and
4320 * replaced with newly allocated duplicates of the corresponding fields in src.
4322 * @return >= 0 on success, a negative AVERROR code on failure.
4324 int avcodec_parameters_copy(AVCodecParameters *dst, const AVCodecParameters *src);
4327 * Fill the parameters struct based on the values from the supplied codec
4328 * context. Any allocated fields in par are freed and replaced with duplicates
4329 * of the corresponding fields in codec.
4331 * @return >= 0 on success, a negative AVERROR code on failure
4333 int avcodec_parameters_from_context(AVCodecParameters *par,
4334 const AVCodecContext *codec);
4337 * Fill the codec context based on the values from the supplied codec
4338 * parameters. Any allocated fields in codec that have a corresponding field in
4339 * par are freed and replaced with duplicates of the corresponding field in par.
4340 * Fields in codec that do not have a counterpart in par are not touched.
4342 * @return >= 0 on success, a negative AVERROR code on failure.
4344 int avcodec_parameters_to_context(AVCodecContext *codec,
4345 const AVCodecParameters *par);
4348 * Initialize the AVCodecContext to use the given AVCodec. Prior to using this
4349 * function the context has to be allocated with avcodec_alloc_context3().
4351 * The functions avcodec_find_decoder_by_name(), avcodec_find_encoder_by_name(),
4352 * avcodec_find_decoder() and avcodec_find_encoder() provide an easy way for
4353 * retrieving a codec.
4355 * @warning This function is not thread safe!
4357 * @note Always call this function before using decoding routines (such as
4358 * @ref avcodec_receive_frame()).
4361 * avcodec_register_all();
4362 * av_dict_set(&opts, "b", "2.5M", 0);
4363 * codec = avcodec_find_decoder(AV_CODEC_ID_H264);
4367 * context = avcodec_alloc_context3(codec);
4369 * if (avcodec_open2(context, codec, opts) < 0)
4373 * @param avctx The context to initialize.
4374 * @param codec The codec to open this context for. If a non-NULL codec has been
4375 * previously passed to avcodec_alloc_context3() or
4376 * for this context, then this parameter MUST be either NULL or
4377 * equal to the previously passed codec.
4378 * @param options A dictionary filled with AVCodecContext and codec-private options.
4379 * On return this object will be filled with options that were not found.
4381 * @return zero on success, a negative value on error
4382 * @see avcodec_alloc_context3(), avcodec_find_decoder(), avcodec_find_encoder(),
4383 * av_dict_set(), av_opt_find().
4385 int avcodec_open2(AVCodecContext *avctx, const AVCodec *codec, AVDictionary **options);
4388 * Close a given AVCodecContext and free all the data associated with it
4389 * (but not the AVCodecContext itself).
4391 * Calling this function on an AVCodecContext that hasn't been opened will free
4392 * the codec-specific data allocated in avcodec_alloc_context3() with a non-NULL
4393 * codec. Subsequent calls will do nothing.
4395 * @note Do not use this function. Use avcodec_free_context() to destroy a
4396 * codec context (either open or closed). Opening and closing a codec context
4397 * multiple times is not supported anymore -- use multiple codec contexts
4400 int avcodec_close(AVCodecContext *avctx);
4403 * Free all allocated data in the given subtitle struct.
4405 * @param sub AVSubtitle to free.
4407 void avsubtitle_free(AVSubtitle *sub);
4414 * @addtogroup lavc_packet
4419 * Allocate an AVPacket and set its fields to default values. The resulting
4420 * struct must be freed using av_packet_free().
4422 * @return An AVPacket filled with default values or NULL on failure.
4424 * @note this only allocates the AVPacket itself, not the data buffers. Those
4425 * must be allocated through other means such as av_new_packet.
4427 * @see av_new_packet
4429 AVPacket *av_packet_alloc(void);
4432 * Create a new packet that references the same data as src.
4434 * This is a shortcut for av_packet_alloc()+av_packet_ref().
4436 * @return newly created AVPacket on success, NULL on error.
4438 * @see av_packet_alloc
4439 * @see av_packet_ref
4441 AVPacket *av_packet_clone(const AVPacket *src);
4444 * Free the packet, if the packet is reference counted, it will be
4445 * unreferenced first.
4447 * @param pkt packet to be freed. The pointer will be set to NULL.
4448 * @note passing NULL is a no-op.
4450 void av_packet_free(AVPacket **pkt);
4453 * Initialize optional fields of a packet with default values.
4455 * Note, this does not touch the data and size members, which have to be
4456 * initialized separately.
4460 void av_init_packet(AVPacket *pkt);
4463 * Allocate the payload of a packet and initialize its fields with
4467 * @param size wanted payload size
4468 * @return 0 if OK, AVERROR_xxx otherwise
4470 int av_new_packet(AVPacket *pkt, int size);
4473 * Reduce packet size, correctly zeroing padding
4476 * @param size new size
4478 void av_shrink_packet(AVPacket *pkt, int size);
4481 * Increase packet size, correctly zeroing padding
4484 * @param grow_by number of bytes by which to increase the size of the packet
4486 int av_grow_packet(AVPacket *pkt, int grow_by);
4489 * Initialize a reference-counted packet from av_malloc()ed data.
4491 * @param pkt packet to be initialized. This function will set the data, size,
4492 * and buf fields, all others are left untouched.
4493 * @param data Data allocated by av_malloc() to be used as packet data. If this
4494 * function returns successfully, the data is owned by the underlying AVBuffer.
4495 * The caller may not access the data through other means.
4496 * @param size size of data in bytes, without the padding. I.e. the full buffer
4497 * size is assumed to be size + AV_INPUT_BUFFER_PADDING_SIZE.
4499 * @return 0 on success, a negative AVERROR on error
4501 int av_packet_from_data(AVPacket *pkt, uint8_t *data, int size);
4503 #if FF_API_AVPACKET_OLD_API
4505 * @warning This is a hack - the packet memory allocation stuff is broken. The
4506 * packet is allocated if it was not really allocated.
4508 * @deprecated Use av_packet_ref or av_packet_make_refcounted
4510 attribute_deprecated
4511 int av_dup_packet(AVPacket *pkt);
4513 * Copy packet, including contents
4515 * @return 0 on success, negative AVERROR on fail
4517 * @deprecated Use av_packet_ref
4519 attribute_deprecated
4520 int av_copy_packet(AVPacket *dst, const AVPacket *src);
4523 * Copy packet side data
4525 * @return 0 on success, negative AVERROR on fail
4527 * @deprecated Use av_packet_copy_props
4529 attribute_deprecated
4530 int av_copy_packet_side_data(AVPacket *dst, const AVPacket *src);
4535 * @deprecated Use av_packet_unref
4537 * @param pkt packet to free
4539 attribute_deprecated
4540 void av_free_packet(AVPacket *pkt);
4543 * Allocate new information of a packet.
4546 * @param type side information type
4547 * @param size side information size
4548 * @return pointer to fresh allocated data or NULL otherwise
4550 uint8_t* av_packet_new_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
4554 * Wrap an existing array as a packet side data.
4557 * @param type side information type
4558 * @param data the side data array. It must be allocated with the av_malloc()
4559 * family of functions. The ownership of the data is transferred to
4561 * @param size side information size
4562 * @return a non-negative number on success, a negative AVERROR code on
4563 * failure. On failure, the packet is unchanged and the data remains
4564 * owned by the caller.
4566 int av_packet_add_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
4567 uint8_t *data, size_t size);
4570 * Shrink the already allocated side data buffer
4573 * @param type side information type
4574 * @param size new side information size
4575 * @return 0 on success, < 0 on failure
4577 int av_packet_shrink_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
4581 * Get side information from packet.
4584 * @param type desired side information type
4585 * @param size pointer for side information size to store (optional)
4586 * @return pointer to data if present or NULL otherwise
4588 uint8_t* av_packet_get_side_data(const AVPacket *pkt, enum AVPacketSideDataType type,
4591 #if FF_API_MERGE_SD_API
4592 attribute_deprecated
4593 int av_packet_merge_side_data(AVPacket *pkt);
4595 attribute_deprecated
4596 int av_packet_split_side_data(AVPacket *pkt);
4599 const char *av_packet_side_data_name(enum AVPacketSideDataType type);
4602 * Pack a dictionary for use in side_data.
4604 * @param dict The dictionary to pack.
4605 * @param size pointer to store the size of the returned data
4606 * @return pointer to data if successful, NULL otherwise
4608 uint8_t *av_packet_pack_dictionary(AVDictionary *dict, int *size);
4610 * Unpack a dictionary from side_data.
4612 * @param data data from side_data
4613 * @param size size of the data
4614 * @param dict the metadata storage dictionary
4615 * @return 0 on success, < 0 on failure
4617 int av_packet_unpack_dictionary(const uint8_t *data, int size, AVDictionary **dict);
4621 * Convenience function to free all the side data stored.
4622 * All the other fields stay untouched.
4626 void av_packet_free_side_data(AVPacket *pkt);
4629 * Setup a new reference to the data described by a given packet
4631 * If src is reference-counted, setup dst as a new reference to the
4632 * buffer in src. Otherwise allocate a new buffer in dst and copy the
4633 * data from src into it.
4635 * All the other fields are copied from src.
4637 * @see av_packet_unref
4639 * @param dst Destination packet
4640 * @param src Source packet
4642 * @return 0 on success, a negative AVERROR on error.
4644 int av_packet_ref(AVPacket *dst, const AVPacket *src);
4649 * Unreference the buffer referenced by the packet and reset the
4650 * remaining packet fields to their default values.
4652 * @param pkt The packet to be unreferenced.
4654 void av_packet_unref(AVPacket *pkt);
4657 * Move every field in src to dst and reset src.
4659 * @see av_packet_unref
4661 * @param src Source packet, will be reset
4662 * @param dst Destination packet
4664 void av_packet_move_ref(AVPacket *dst, AVPacket *src);
4667 * Copy only "properties" fields from src to dst.
4669 * Properties for the purpose of this function are all the fields
4670 * beside those related to the packet data (buf, data, size)
4672 * @param dst Destination packet
4673 * @param src Source packet
4675 * @return 0 on success AVERROR on failure.
4677 int av_packet_copy_props(AVPacket *dst, const AVPacket *src);
4680 * Ensure the data described by a given packet is reference counted.
4682 * @note This function does not ensure that the reference will be writable.
4683 * Use av_packet_make_writable instead for that purpose.
4685 * @see av_packet_ref
4686 * @see av_packet_make_writable
4688 * @param pkt packet whose data should be made reference counted.
4690 * @return 0 on success, a negative AVERROR on error. On failure, the
4691 * packet is unchanged.
4693 int av_packet_make_refcounted(AVPacket *pkt);
4696 * Create a writable reference for the data described by a given packet,
4697 * avoiding data copy if possible.
4699 * @param pkt Packet whose data should be made writable.
4701 * @return 0 on success, a negative AVERROR on failure. On failure, the
4702 * packet is unchanged.
4704 int av_packet_make_writable(AVPacket *pkt);
4707 * Convert valid timing fields (timestamps / durations) in a packet from one
4708 * timebase to another. Timestamps with unknown values (AV_NOPTS_VALUE) will be
4711 * @param pkt packet on which the conversion will be performed
4712 * @param tb_src source timebase, in which the timing fields in pkt are
4714 * @param tb_dst destination timebase, to which the timing fields will be
4717 void av_packet_rescale_ts(AVPacket *pkt, AVRational tb_src, AVRational tb_dst);
4724 * @addtogroup lavc_decoding
4729 * Find a registered decoder with a matching codec ID.
4731 * @param id AVCodecID of the requested decoder
4732 * @return A decoder if one was found, NULL otherwise.
4734 AVCodec *avcodec_find_decoder(enum AVCodecID id);
4737 * Find a registered decoder with the specified name.
4739 * @param name name of the requested decoder
4740 * @return A decoder if one was found, NULL otherwise.
4742 AVCodec *avcodec_find_decoder_by_name(const char *name);
4745 * The default callback for AVCodecContext.get_buffer2(). It is made public so
4746 * it can be called by custom get_buffer2() implementations for decoders without
4747 * AV_CODEC_CAP_DR1 set.
4749 int avcodec_default_get_buffer2(AVCodecContext *s, AVFrame *frame, int flags);
4752 * Modify width and height values so that they will result in a memory
4753 * buffer that is acceptable for the codec if you do not use any horizontal
4756 * May only be used if a codec with AV_CODEC_CAP_DR1 has been opened.
4758 void avcodec_align_dimensions(AVCodecContext *s, int *width, int *height);
4761 * Modify width and height values so that they will result in a memory
4762 * buffer that is acceptable for the codec if you also ensure that all
4763 * line sizes are a multiple of the respective linesize_align[i].
4765 * May only be used if a codec with AV_CODEC_CAP_DR1 has been opened.
4767 void avcodec_align_dimensions2(AVCodecContext *s, int *width, int *height,
4768 int linesize_align[AV_NUM_DATA_POINTERS]);
4771 * Converts AVChromaLocation to swscale x/y chroma position.
4773 * The positions represent the chroma (0,0) position in a coordinates system
4774 * with luma (0,0) representing the origin and luma(1,1) representing 256,256
4776 * @param xpos horizontal chroma sample position
4777 * @param ypos vertical chroma sample position
4779 int avcodec_enum_to_chroma_pos(int *xpos, int *ypos, enum AVChromaLocation pos);
4782 * Converts swscale x/y chroma position to AVChromaLocation.
4784 * The positions represent the chroma (0,0) position in a coordinates system
4785 * with luma (0,0) representing the origin and luma(1,1) representing 256,256
4787 * @param xpos horizontal chroma sample position
4788 * @param ypos vertical chroma sample position
4790 enum AVChromaLocation avcodec_chroma_pos_to_enum(int xpos, int ypos);
4793 * Decode the audio frame of size avpkt->size from avpkt->data into frame.
4795 * Some decoders may support multiple frames in a single AVPacket. Such
4796 * decoders would then just decode the first frame and the return value would be
4797 * less than the packet size. In this case, avcodec_decode_audio4 has to be
4798 * called again with an AVPacket containing the remaining data in order to
4799 * decode the second frame, etc... Even if no frames are returned, the packet
4800 * needs to be fed to the decoder with remaining data until it is completely
4801 * consumed or an error occurs.
4803 * Some decoders (those marked with AV_CODEC_CAP_DELAY) have a delay between input
4804 * and output. This means that for some packets they will not immediately
4805 * produce decoded output and need to be flushed at the end of decoding to get
4806 * all the decoded data. Flushing is done by calling this function with packets
4807 * with avpkt->data set to NULL and avpkt->size set to 0 until it stops
4808 * returning samples. It is safe to flush even those decoders that are not
4809 * marked with AV_CODEC_CAP_DELAY, then no samples will be returned.
4811 * @warning The input buffer, avpkt->data must be AV_INPUT_BUFFER_PADDING_SIZE
4812 * larger than the actual read bytes because some optimized bitstream
4813 * readers read 32 or 64 bits at once and could read over the end.
4815 * @note The AVCodecContext MUST have been opened with @ref avcodec_open2()
4816 * before packets may be fed to the decoder.
4818 * @param avctx the codec context
4819 * @param[out] frame The AVFrame in which to store decoded audio samples.
4820 * The decoder will allocate a buffer for the decoded frame by
4821 * calling the AVCodecContext.get_buffer2() callback.
4822 * When AVCodecContext.refcounted_frames is set to 1, the frame is
4823 * reference counted and the returned reference belongs to the
4824 * caller. The caller must release the frame using av_frame_unref()
4825 * when the frame is no longer needed. The caller may safely write
4826 * to the frame if av_frame_is_writable() returns 1.
4827 * When AVCodecContext.refcounted_frames is set to 0, the returned
4828 * reference belongs to the decoder and is valid only until the
4829 * next call to this function or until closing or flushing the
4830 * decoder. The caller may not write to it.
4831 * @param[out] got_frame_ptr Zero if no frame could be decoded, otherwise it is
4832 * non-zero. Note that this field being set to zero
4833 * does not mean that an error has occurred. For
4834 * decoders with AV_CODEC_CAP_DELAY set, no given decode
4835 * call is guaranteed to produce a frame.
4836 * @param[in] avpkt The input AVPacket containing the input buffer.
4837 * At least avpkt->data and avpkt->size should be set. Some
4838 * decoders might also require additional fields to be set.
4839 * @return A negative error code is returned if an error occurred during
4840 * decoding, otherwise the number of bytes consumed from the input
4841 * AVPacket is returned.
4843 * @deprecated Use avcodec_send_packet() and avcodec_receive_frame().
4845 attribute_deprecated
4846 int avcodec_decode_audio4(AVCodecContext *avctx, AVFrame *frame,
4847 int *got_frame_ptr, const AVPacket *avpkt);
4850 * Decode the video frame of size avpkt->size from avpkt->data into picture.
4851 * Some decoders may support multiple frames in a single AVPacket, such
4852 * decoders would then just decode the first frame.
4854 * @warning The input buffer must be AV_INPUT_BUFFER_PADDING_SIZE larger than
4855 * the actual read bytes because some optimized bitstream readers read 32 or 64
4856 * bits at once and could read over the end.
4858 * @warning The end of the input buffer buf should be set to 0 to ensure that
4859 * no overreading happens for damaged MPEG streams.
4861 * @note Codecs which have the AV_CODEC_CAP_DELAY capability set have a delay
4862 * between input and output, these need to be fed with avpkt->data=NULL,
4863 * avpkt->size=0 at the end to return the remaining frames.
4865 * @note The AVCodecContext MUST have been opened with @ref avcodec_open2()
4866 * before packets may be fed to the decoder.
4868 * @param avctx the codec context
4869 * @param[out] picture The AVFrame in which the decoded video frame will be stored.
4870 * Use av_frame_alloc() to get an AVFrame. The codec will
4871 * allocate memory for the actual bitmap by calling the
4872 * AVCodecContext.get_buffer2() callback.
4873 * When AVCodecContext.refcounted_frames is set to 1, the frame is
4874 * reference counted and the returned reference belongs to the
4875 * caller. The caller must release the frame using av_frame_unref()
4876 * when the frame is no longer needed. The caller may safely write
4877 * to the frame if av_frame_is_writable() returns 1.
4878 * When AVCodecContext.refcounted_frames is set to 0, the returned
4879 * reference belongs to the decoder and is valid only until the
4880 * next call to this function or until closing or flushing the
4881 * decoder. The caller may not write to it.
4883 * @param[in] avpkt The input AVPacket containing the input buffer.
4884 * You can create such packet with av_init_packet() and by then setting
4885 * data and size, some decoders might in addition need other fields like
4886 * flags&AV_PKT_FLAG_KEY. All decoders are designed to use the least
4888 * @param[in,out] got_picture_ptr Zero if no frame could be decompressed, otherwise, it is nonzero.
4889 * @return On error a negative value is returned, otherwise the number of bytes
4890 * used or zero if no frame could be decompressed.
4892 * @deprecated Use avcodec_send_packet() and avcodec_receive_frame().
4894 attribute_deprecated
4895 int avcodec_decode_video2(AVCodecContext *avctx, AVFrame *picture,
4896 int *got_picture_ptr,
4897 const AVPacket *avpkt);
4900 * Decode a subtitle message.
4901 * Return a negative value on error, otherwise return the number of bytes used.
4902 * If no subtitle could be decompressed, got_sub_ptr is zero.
4903 * Otherwise, the subtitle is stored in *sub.
4904 * Note that AV_CODEC_CAP_DR1 is not available for subtitle codecs. This is for
4905 * simplicity, because the performance difference is expected to be negligible
4906 * and reusing a get_buffer written for video codecs would probably perform badly
4907 * due to a potentially very different allocation pattern.
4909 * Some decoders (those marked with AV_CODEC_CAP_DELAY) have a delay between input
4910 * and output. This means that for some packets they will not immediately
4911 * produce decoded output and need to be flushed at the end of decoding to get
4912 * all the decoded data. Flushing is done by calling this function with packets
4913 * with avpkt->data set to NULL and avpkt->size set to 0 until it stops
4914 * returning subtitles. It is safe to flush even those decoders that are not
4915 * marked with AV_CODEC_CAP_DELAY, then no subtitles will be returned.
4917 * @note The AVCodecContext MUST have been opened with @ref avcodec_open2()
4918 * before packets may be fed to the decoder.
4920 * @param avctx the codec context
4921 * @param[out] sub The preallocated AVSubtitle in which the decoded subtitle will be stored,
4922 * must be freed with avsubtitle_free if *got_sub_ptr is set.
4923 * @param[in,out] got_sub_ptr Zero if no subtitle could be decompressed, otherwise, it is nonzero.
4924 * @param[in] avpkt The input AVPacket containing the input buffer.
4926 int avcodec_decode_subtitle2(AVCodecContext *avctx, AVSubtitle *sub,
4931 * Supply raw packet data as input to a decoder.
4933 * Internally, this call will copy relevant AVCodecContext fields, which can
4934 * influence decoding per-packet, and apply them when the packet is actually
4935 * decoded. (For example AVCodecContext.skip_frame, which might direct the
4936 * decoder to drop the frame contained by the packet sent with this function.)
4938 * @warning The input buffer, avpkt->data must be AV_INPUT_BUFFER_PADDING_SIZE
4939 * larger than the actual read bytes because some optimized bitstream
4940 * readers read 32 or 64 bits at once and could read over the end.
4942 * @warning Do not mix this API with the legacy API (like avcodec_decode_video2())
4943 * on the same AVCodecContext. It will return unexpected results now
4944 * or in future libavcodec versions.
4946 * @note The AVCodecContext MUST have been opened with @ref avcodec_open2()
4947 * before packets may be fed to the decoder.
4949 * @param avctx codec context
4950 * @param[in] avpkt The input AVPacket. Usually, this will be a single video
4951 * frame, or several complete audio frames.
4952 * Ownership of the packet remains with the caller, and the
4953 * decoder will not write to the packet. The decoder may create
4954 * a reference to the packet data (or copy it if the packet is
4955 * not reference-counted).
4956 * Unlike with older APIs, the packet is always fully consumed,
4957 * and if it contains multiple frames (e.g. some audio codecs),
4958 * will require you to call avcodec_receive_frame() multiple
4959 * times afterwards before you can send a new packet.
4960 * It can be NULL (or an AVPacket with data set to NULL and
4961 * size set to 0); in this case, it is considered a flush
4962 * packet, which signals the end of the stream. Sending the
4963 * first flush packet will return success. Subsequent ones are
4964 * unnecessary and will return AVERROR_EOF. If the decoder
4965 * still has frames buffered, it will return them after sending
4968 * @return 0 on success, otherwise negative error code:
4969 * AVERROR(EAGAIN): input is not accepted in the current state - user
4970 * must read output with avcodec_receive_frame() (once
4971 * all output is read, the packet should be resent, and
4972 * the call will not fail with EAGAIN).
4973 * AVERROR_EOF: the decoder has been flushed, and no new packets can
4974 * be sent to it (also returned if more than 1 flush
4976 * AVERROR(EINVAL): codec not opened, it is an encoder, or requires flush
4977 * AVERROR(ENOMEM): failed to add packet to internal queue, or similar
4978 * other errors: legitimate decoding errors
4980 int avcodec_send_packet(AVCodecContext *avctx, const AVPacket *avpkt);
4983 * Return decoded output data from a decoder.
4985 * @param avctx codec context
4986 * @param frame This will be set to a reference-counted video or audio
4987 * frame (depending on the decoder type) allocated by the
4988 * decoder. Note that the function will always call
4989 * av_frame_unref(frame) before doing anything else.
4992 * 0: success, a frame was returned
4993 * AVERROR(EAGAIN): output is not available in this state - user must try
4995 * AVERROR_EOF: the decoder has been fully flushed, and there will be
4996 * no more output frames
4997 * AVERROR(EINVAL): codec not opened, or it is an encoder
4998 * AVERROR_INPUT_CHANGED: current decoded frame has changed parameters
4999 * with respect to first decoded frame. Applicable
5000 * when flag AV_CODEC_FLAG_DROPCHANGED is set.
5001 * other negative values: legitimate decoding errors
5003 int avcodec_receive_frame(AVCodecContext *avctx, AVFrame *frame);
5006 * Supply a raw video or audio frame to the encoder. Use avcodec_receive_packet()
5007 * to retrieve buffered output packets.
5009 * @param avctx codec context
5010 * @param[in] frame AVFrame containing the raw audio or video frame to be encoded.
5011 * Ownership of the frame remains with the caller, and the
5012 * encoder will not write to the frame. The encoder may create
5013 * a reference to the frame data (or copy it if the frame is
5014 * not reference-counted).
5015 * It can be NULL, in which case it is considered a flush
5016 * packet. This signals the end of the stream. If the encoder
5017 * still has packets buffered, it will return them after this
5018 * call. Once flushing mode has been entered, additional flush
5019 * packets are ignored, and sending frames will return
5023 * If AV_CODEC_CAP_VARIABLE_FRAME_SIZE is set, then each frame
5024 * can have any number of samples.
5025 * If it is not set, frame->nb_samples must be equal to
5026 * avctx->frame_size for all frames except the last.
5027 * The final frame may be smaller than avctx->frame_size.
5028 * @return 0 on success, otherwise negative error code:
5029 * AVERROR(EAGAIN): input is not accepted in the current state - user
5030 * must read output with avcodec_receive_packet() (once
5031 * all output is read, the packet should be resent, and
5032 * the call will not fail with EAGAIN).
5033 * AVERROR_EOF: the encoder has been flushed, and no new frames can
5035 * AVERROR(EINVAL): codec not opened, refcounted_frames not set, it is a
5036 * decoder, or requires flush
5037 * AVERROR(ENOMEM): failed to add packet to internal queue, or similar
5038 * other errors: legitimate decoding errors
5040 int avcodec_send_frame(AVCodecContext *avctx, const AVFrame *frame);
5043 * Read encoded data from the encoder.
5045 * @param avctx codec context
5046 * @param avpkt This will be set to a reference-counted packet allocated by the
5047 * encoder. Note that the function will always call
5048 * av_packet_unref(avpkt) before doing anything else.
5049 * @return 0 on success, otherwise negative error code:
5050 * AVERROR(EAGAIN): output is not available in the current state - user
5051 * must try to send input
5052 * AVERROR_EOF: the encoder has been fully flushed, and there will be
5053 * no more output packets
5054 * AVERROR(EINVAL): codec not opened, or it is an encoder
5055 * other errors: legitimate decoding errors
5057 int avcodec_receive_packet(AVCodecContext *avctx, AVPacket *avpkt);
5060 * Create and return a AVHWFramesContext with values adequate for hardware
5061 * decoding. This is meant to get called from the get_format callback, and is
5062 * a helper for preparing a AVHWFramesContext for AVCodecContext.hw_frames_ctx.
5063 * This API is for decoding with certain hardware acceleration modes/APIs only.
5065 * The returned AVHWFramesContext is not initialized. The caller must do this
5066 * with av_hwframe_ctx_init().
5068 * Calling this function is not a requirement, but makes it simpler to avoid
5069 * codec or hardware API specific details when manually allocating frames.
5071 * Alternatively to this, an API user can set AVCodecContext.hw_device_ctx,
5072 * which sets up AVCodecContext.hw_frames_ctx fully automatically, and makes
5073 * it unnecessary to call this function or having to care about
5074 * AVHWFramesContext initialization at all.
5076 * There are a number of requirements for calling this function:
5078 * - It must be called from get_format with the same avctx parameter that was
5079 * passed to get_format. Calling it outside of get_format is not allowed, and
5080 * can trigger undefined behavior.
5081 * - The function is not always supported (see description of return values).
5082 * Even if this function returns successfully, hwaccel initialization could
5083 * fail later. (The degree to which implementations check whether the stream
5084 * is actually supported varies. Some do this check only after the user's
5085 * get_format callback returns.)
5086 * - The hw_pix_fmt must be one of the choices suggested by get_format. If the
5087 * user decides to use a AVHWFramesContext prepared with this API function,
5088 * the user must return the same hw_pix_fmt from get_format.
5089 * - The device_ref passed to this function must support the given hw_pix_fmt.
5090 * - After calling this API function, it is the user's responsibility to
5091 * initialize the AVHWFramesContext (returned by the out_frames_ref parameter),
5092 * and to set AVCodecContext.hw_frames_ctx to it. If done, this must be done
5093 * before returning from get_format (this is implied by the normal
5094 * AVCodecContext.hw_frames_ctx API rules).
5095 * - The AVHWFramesContext parameters may change every time time get_format is
5096 * called. Also, AVCodecContext.hw_frames_ctx is reset before get_format. So
5097 * you are inherently required to go through this process again on every
5099 * - It is perfectly possible to call this function without actually using
5100 * the resulting AVHWFramesContext. One use-case might be trying to reuse a
5101 * previously initialized AVHWFramesContext, and calling this API function
5102 * only to test whether the required frame parameters have changed.
5103 * - Fields that use dynamically allocated values of any kind must not be set
5104 * by the user unless setting them is explicitly allowed by the documentation.
5105 * If the user sets AVHWFramesContext.free and AVHWFramesContext.user_opaque,
5106 * the new free callback must call the potentially set previous free callback.
5107 * This API call may set any dynamically allocated fields, including the free
5110 * The function will set at least the following fields on AVHWFramesContext
5111 * (potentially more, depending on hwaccel API):
5113 * - All fields set by av_hwframe_ctx_alloc().
5114 * - Set the format field to hw_pix_fmt.
5115 * - Set the sw_format field to the most suited and most versatile format. (An
5116 * implication is that this will prefer generic formats over opaque formats
5117 * with arbitrary restrictions, if possible.)
5118 * - Set the width/height fields to the coded frame size, rounded up to the
5119 * API-specific minimum alignment.
5120 * - Only _if_ the hwaccel requires a pre-allocated pool: set the initial_pool_size
5121 * field to the number of maximum reference surfaces possible with the codec,
5122 * plus 1 surface for the user to work (meaning the user can safely reference
5123 * at most 1 decoded surface at a time), plus additional buffering introduced
5124 * by frame threading. If the hwaccel does not require pre-allocation, the
5125 * field is left to 0, and the decoder will allocate new surfaces on demand
5127 * - Possibly AVHWFramesContext.hwctx fields, depending on the underlying
5130 * Essentially, out_frames_ref returns the same as av_hwframe_ctx_alloc(), but
5131 * with basic frame parameters set.
5133 * The function is stateless, and does not change the AVCodecContext or the
5134 * device_ref AVHWDeviceContext.
5136 * @param avctx The context which is currently calling get_format, and which
5137 * implicitly contains all state needed for filling the returned
5138 * AVHWFramesContext properly.
5139 * @param device_ref A reference to the AVHWDeviceContext describing the device
5140 * which will be used by the hardware decoder.
5141 * @param hw_pix_fmt The hwaccel format you are going to return from get_format.
5142 * @param out_frames_ref On success, set to a reference to an _uninitialized_
5143 * AVHWFramesContext, created from the given device_ref.
5144 * Fields will be set to values required for decoding.
5145 * Not changed if an error is returned.
5146 * @return zero on success, a negative value on error. The following error codes
5147 * have special semantics:
5148 * AVERROR(ENOENT): the decoder does not support this functionality. Setup
5149 * is always manual, or it is a decoder which does not
5150 * support setting AVCodecContext.hw_frames_ctx at all,
5151 * or it is a software format.
5152 * AVERROR(EINVAL): it is known that hardware decoding is not supported for
5153 * this configuration, or the device_ref is not supported
5154 * for the hwaccel referenced by hw_pix_fmt.
5156 int avcodec_get_hw_frames_parameters(AVCodecContext *avctx,
5157 AVBufferRef *device_ref,
5158 enum AVPixelFormat hw_pix_fmt,
5159 AVBufferRef **out_frames_ref);
5164 * @defgroup lavc_parsing Frame parsing
5168 enum AVPictureStructure {
5169 AV_PICTURE_STRUCTURE_UNKNOWN, //< unknown
5170 AV_PICTURE_STRUCTURE_TOP_FIELD, //< coded as top field
5171 AV_PICTURE_STRUCTURE_BOTTOM_FIELD, //< coded as bottom field
5172 AV_PICTURE_STRUCTURE_FRAME, //< coded as frame
5175 typedef struct AVCodecParserContext {
5177 struct AVCodecParser *parser;
5178 int64_t frame_offset; /* offset of the current frame */
5179 int64_t cur_offset; /* current offset
5180 (incremented by each av_parser_parse()) */
5181 int64_t next_frame_offset; /* offset of the next frame */
5183 int pict_type; /* XXX: Put it back in AVCodecContext. */
5185 * This field is used for proper frame duration computation in lavf.
5186 * It signals, how much longer the frame duration of the current frame
5187 * is compared to normal frame duration.
5189 * frame_duration = (1 + repeat_pict) * time_base
5191 * It is used by codecs like H.264 to display telecined material.
5193 int repeat_pict; /* XXX: Put it back in AVCodecContext. */
5194 int64_t pts; /* pts of the current frame */
5195 int64_t dts; /* dts of the current frame */
5200 int fetch_timestamp;
5202 #define AV_PARSER_PTS_NB 4
5203 int cur_frame_start_index;
5204 int64_t cur_frame_offset[AV_PARSER_PTS_NB];
5205 int64_t cur_frame_pts[AV_PARSER_PTS_NB];
5206 int64_t cur_frame_dts[AV_PARSER_PTS_NB];
5209 #define PARSER_FLAG_COMPLETE_FRAMES 0x0001
5210 #define PARSER_FLAG_ONCE 0x0002
5211 /// Set if the parser has a valid file offset
5212 #define PARSER_FLAG_FETCHED_OFFSET 0x0004
5213 #define PARSER_FLAG_USE_CODEC_TS 0x1000
5215 int64_t offset; ///< byte offset from starting packet start
5216 int64_t cur_frame_end[AV_PARSER_PTS_NB];
5219 * Set by parser to 1 for key frames and 0 for non-key frames.
5220 * It is initialized to -1, so if the parser doesn't set this flag,
5221 * old-style fallback using AV_PICTURE_TYPE_I picture type as key frames
5226 #if FF_API_CONVERGENCE_DURATION
5228 * @deprecated unused
5230 attribute_deprecated
5231 int64_t convergence_duration;
5234 // Timestamp generation support:
5236 * Synchronization point for start of timestamp generation.
5238 * Set to >0 for sync point, 0 for no sync point and <0 for undefined
5241 * For example, this corresponds to presence of H.264 buffering period
5247 * Offset of the current timestamp against last timestamp sync point in
5248 * units of AVCodecContext.time_base.
5250 * Set to INT_MIN when dts_sync_point unused. Otherwise, it must
5251 * contain a valid timestamp offset.
5253 * Note that the timestamp of sync point has usually a nonzero
5254 * dts_ref_dts_delta, which refers to the previous sync point. Offset of
5255 * the next frame after timestamp sync point will be usually 1.
5257 * For example, this corresponds to H.264 cpb_removal_delay.
5259 int dts_ref_dts_delta;
5262 * Presentation delay of current frame in units of AVCodecContext.time_base.
5264 * Set to INT_MIN when dts_sync_point unused. Otherwise, it must
5265 * contain valid non-negative timestamp delta (presentation time of a frame
5266 * must not lie in the past).
5268 * This delay represents the difference between decoding and presentation
5269 * time of the frame.
5271 * For example, this corresponds to H.264 dpb_output_delay.
5276 * Position of the packet in file.
5278 * Analogous to cur_frame_pts/dts
5280 int64_t cur_frame_pos[AV_PARSER_PTS_NB];
5283 * Byte position of currently parsed frame in stream.
5288 * Previous frame byte position.
5293 * Duration of the current frame.
5294 * For audio, this is in units of 1 / AVCodecContext.sample_rate.
5295 * For all other types, this is in units of AVCodecContext.time_base.
5299 enum AVFieldOrder field_order;
5302 * Indicate whether a picture is coded as a frame, top field or bottom field.
5304 * For example, H.264 field_pic_flag equal to 0 corresponds to
5305 * AV_PICTURE_STRUCTURE_FRAME. An H.264 picture with field_pic_flag
5306 * equal to 1 and bottom_field_flag equal to 0 corresponds to
5307 * AV_PICTURE_STRUCTURE_TOP_FIELD.
5309 enum AVPictureStructure picture_structure;
5312 * Picture number incremented in presentation or output order.
5313 * This field may be reinitialized at the first picture of a new sequence.
5315 * For example, this corresponds to H.264 PicOrderCnt.
5317 int output_picture_number;
5320 * Dimensions of the decoded video intended for presentation.
5326 * Dimensions of the coded video.
5332 * The format of the coded data, corresponds to enum AVPixelFormat for video
5333 * and for enum AVSampleFormat for audio.
5335 * Note that a decoder can have considerable freedom in how exactly it
5336 * decodes the data, so the format reported here might be different from the
5337 * one returned by a decoder.
5340 } AVCodecParserContext;
5342 typedef struct AVCodecParser {
5343 int codec_ids[5]; /* several codec IDs are permitted */
5345 int (*parser_init)(AVCodecParserContext *s);
5346 /* This callback never returns an error, a negative value means that
5347 * the frame start was in a previous packet. */
5348 int (*parser_parse)(AVCodecParserContext *s,
5349 AVCodecContext *avctx,
5350 const uint8_t **poutbuf, int *poutbuf_size,
5351 const uint8_t *buf, int buf_size);
5352 void (*parser_close)(AVCodecParserContext *s);
5353 int (*split)(AVCodecContext *avctx, const uint8_t *buf, int buf_size);
5354 struct AVCodecParser *next;
5358 * Iterate over all registered codec parsers.
5360 * @param opaque a pointer where libavcodec will store the iteration state. Must
5361 * point to NULL to start the iteration.
5363 * @return the next registered codec parser or NULL when the iteration is
5366 const AVCodecParser *av_parser_iterate(void **opaque);
5368 attribute_deprecated
5369 AVCodecParser *av_parser_next(const AVCodecParser *c);
5371 attribute_deprecated
5372 void av_register_codec_parser(AVCodecParser *parser);
5373 AVCodecParserContext *av_parser_init(int codec_id);
5378 * @param s parser context.
5379 * @param avctx codec context.
5380 * @param poutbuf set to pointer to parsed buffer or NULL if not yet finished.
5381 * @param poutbuf_size set to size of parsed buffer or zero if not yet finished.
5382 * @param buf input buffer.
5383 * @param buf_size buffer size in bytes without the padding. I.e. the full buffer
5384 size is assumed to be buf_size + AV_INPUT_BUFFER_PADDING_SIZE.
5385 To signal EOF, this should be 0 (so that the last frame
5387 * @param pts input presentation timestamp.
5388 * @param dts input decoding timestamp.
5389 * @param pos input byte position in stream.
5390 * @return the number of bytes of the input bitstream used.
5395 * len = av_parser_parse2(myparser, AVCodecContext, &data, &size,
5402 * decode_frame(data, size);
5406 int av_parser_parse2(AVCodecParserContext *s,
5407 AVCodecContext *avctx,
5408 uint8_t **poutbuf, int *poutbuf_size,
5409 const uint8_t *buf, int buf_size,
5410 int64_t pts, int64_t dts,
5414 * @return 0 if the output buffer is a subset of the input, 1 if it is allocated and must be freed
5415 * @deprecated use AVBitStreamFilter
5417 int av_parser_change(AVCodecParserContext *s,
5418 AVCodecContext *avctx,
5419 uint8_t **poutbuf, int *poutbuf_size,
5420 const uint8_t *buf, int buf_size, int keyframe);
5421 void av_parser_close(AVCodecParserContext *s);
5429 * @addtogroup lavc_encoding
5434 * Find a registered encoder with a matching codec ID.
5436 * @param id AVCodecID of the requested encoder
5437 * @return An encoder if one was found, NULL otherwise.
5439 AVCodec *avcodec_find_encoder(enum AVCodecID id);
5442 * Find a registered encoder with the specified name.
5444 * @param name name of the requested encoder
5445 * @return An encoder if one was found, NULL otherwise.
5447 AVCodec *avcodec_find_encoder_by_name(const char *name);
5450 * Encode a frame of audio.
5452 * Takes input samples from frame and writes the next output packet, if
5453 * available, to avpkt. The output packet does not necessarily contain data for
5454 * the most recent frame, as encoders can delay, split, and combine input frames
5455 * internally as needed.
5457 * @param avctx codec context
5458 * @param avpkt output AVPacket.
5459 * The user can supply an output buffer by setting
5460 * avpkt->data and avpkt->size prior to calling the
5461 * function, but if the size of the user-provided data is not
5462 * large enough, encoding will fail. If avpkt->data and
5463 * avpkt->size are set, avpkt->destruct must also be set. All
5464 * other AVPacket fields will be reset by the encoder using
5465 * av_init_packet(). If avpkt->data is NULL, the encoder will
5466 * allocate it. The encoder will set avpkt->size to the size
5467 * of the output packet.
5469 * If this function fails or produces no output, avpkt will be
5470 * freed using av_packet_unref().
5471 * @param[in] frame AVFrame containing the raw audio data to be encoded.
5472 * May be NULL when flushing an encoder that has the
5473 * AV_CODEC_CAP_DELAY capability set.
5474 * If AV_CODEC_CAP_VARIABLE_FRAME_SIZE is set, then each frame
5475 * can have any number of samples.
5476 * If it is not set, frame->nb_samples must be equal to
5477 * avctx->frame_size for all frames except the last.
5478 * The final frame may be smaller than avctx->frame_size.
5479 * @param[out] got_packet_ptr This field is set to 1 by libavcodec if the
5480 * output packet is non-empty, and to 0 if it is
5481 * empty. If the function returns an error, the
5482 * packet can be assumed to be invalid, and the
5483 * value of got_packet_ptr is undefined and should
5485 * @return 0 on success, negative error code on failure
5487 * @deprecated use avcodec_send_frame()/avcodec_receive_packet() instead
5489 attribute_deprecated
5490 int avcodec_encode_audio2(AVCodecContext *avctx, AVPacket *avpkt,
5491 const AVFrame *frame, int *got_packet_ptr);
5494 * Encode a frame of video.
5496 * Takes input raw video data from frame and writes the next output packet, if
5497 * available, to avpkt. The output packet does not necessarily contain data for
5498 * the most recent frame, as encoders can delay and reorder input frames
5499 * internally as needed.
5501 * @param avctx codec context
5502 * @param avpkt output AVPacket.
5503 * The user can supply an output buffer by setting
5504 * avpkt->data and avpkt->size prior to calling the
5505 * function, but if the size of the user-provided data is not
5506 * large enough, encoding will fail. All other AVPacket fields
5507 * will be reset by the encoder using av_init_packet(). If
5508 * avpkt->data is NULL, the encoder will allocate it.
5509 * The encoder will set avpkt->size to the size of the
5510 * output packet. The returned data (if any) belongs to the
5511 * caller, he is responsible for freeing it.
5513 * If this function fails or produces no output, avpkt will be
5514 * freed using av_packet_unref().
5515 * @param[in] frame AVFrame containing the raw video data to be encoded.
5516 * May be NULL when flushing an encoder that has the
5517 * AV_CODEC_CAP_DELAY capability set.
5518 * @param[out] got_packet_ptr This field is set to 1 by libavcodec if the
5519 * output packet is non-empty, and to 0 if it is
5520 * empty. If the function returns an error, the
5521 * packet can be assumed to be invalid, and the
5522 * value of got_packet_ptr is undefined and should
5524 * @return 0 on success, negative error code on failure
5526 * @deprecated use avcodec_send_frame()/avcodec_receive_packet() instead
5528 attribute_deprecated
5529 int avcodec_encode_video2(AVCodecContext *avctx, AVPacket *avpkt,
5530 const AVFrame *frame, int *got_packet_ptr);
5532 int avcodec_encode_subtitle(AVCodecContext *avctx, uint8_t *buf, int buf_size,
5533 const AVSubtitle *sub);
5540 #if FF_API_AVPICTURE
5542 * @addtogroup lavc_picture
5547 * @deprecated unused
5549 attribute_deprecated
5550 int avpicture_alloc(AVPicture *picture, enum AVPixelFormat pix_fmt, int width, int height);
5553 * @deprecated unused
5555 attribute_deprecated
5556 void avpicture_free(AVPicture *picture);
5559 * @deprecated use av_image_fill_arrays() instead.
5561 attribute_deprecated
5562 int avpicture_fill(AVPicture *picture, const uint8_t *ptr,
5563 enum AVPixelFormat pix_fmt, int width, int height);
5566 * @deprecated use av_image_copy_to_buffer() instead.
5568 attribute_deprecated
5569 int avpicture_layout(const AVPicture *src, enum AVPixelFormat pix_fmt,
5570 int width, int height,
5571 unsigned char *dest, int dest_size);
5574 * @deprecated use av_image_get_buffer_size() instead.
5576 attribute_deprecated
5577 int avpicture_get_size(enum AVPixelFormat pix_fmt, int width, int height);
5580 * @deprecated av_image_copy() instead.
5582 attribute_deprecated
5583 void av_picture_copy(AVPicture *dst, const AVPicture *src,
5584 enum AVPixelFormat pix_fmt, int width, int height);
5587 * @deprecated unused
5589 attribute_deprecated
5590 int av_picture_crop(AVPicture *dst, const AVPicture *src,
5591 enum AVPixelFormat pix_fmt, int top_band, int left_band);
5594 * @deprecated unused
5596 attribute_deprecated
5597 int av_picture_pad(AVPicture *dst, const AVPicture *src, int height, int width, enum AVPixelFormat pix_fmt,
5598 int padtop, int padbottom, int padleft, int padright, int *color);
5606 * @defgroup lavc_misc Utility functions
5609 * Miscellaneous utility functions related to both encoding and decoding
5615 * @defgroup lavc_misc_pixfmt Pixel formats
5617 * Functions for working with pixel formats.
5621 #if FF_API_GETCHROMA
5623 * @deprecated Use av_pix_fmt_get_chroma_sub_sample
5626 attribute_deprecated
5627 void avcodec_get_chroma_sub_sample(enum AVPixelFormat pix_fmt, int *h_shift, int *v_shift);
5631 * Return a value representing the fourCC code associated to the
5632 * pixel format pix_fmt, or 0 if no associated fourCC code can be
5635 unsigned int avcodec_pix_fmt_to_codec_tag(enum AVPixelFormat pix_fmt);
5638 * @deprecated see av_get_pix_fmt_loss()
5640 int avcodec_get_pix_fmt_loss(enum AVPixelFormat dst_pix_fmt, enum AVPixelFormat src_pix_fmt,
5644 * Find the best pixel format to convert to given a certain source pixel
5645 * format. When converting from one pixel format to another, information loss
5646 * may occur. For example, when converting from RGB24 to GRAY, the color
5647 * information will be lost. Similarly, other losses occur when converting from
5648 * some formats to other formats. avcodec_find_best_pix_fmt_of_2() searches which of
5649 * the given pixel formats should be used to suffer the least amount of loss.
5650 * The pixel formats from which it chooses one, are determined by the
5651 * pix_fmt_list parameter.
5654 * @param[in] pix_fmt_list AV_PIX_FMT_NONE terminated array of pixel formats to choose from
5655 * @param[in] src_pix_fmt source pixel format
5656 * @param[in] has_alpha Whether the source pixel format alpha channel is used.
5657 * @param[out] loss_ptr Combination of flags informing you what kind of losses will occur.
5658 * @return The best pixel format to convert to or -1 if none was found.
5660 enum AVPixelFormat avcodec_find_best_pix_fmt_of_list(const enum AVPixelFormat *pix_fmt_list,
5661 enum AVPixelFormat src_pix_fmt,
5662 int has_alpha, int *loss_ptr);
5665 * @deprecated see av_find_best_pix_fmt_of_2()
5667 enum AVPixelFormat avcodec_find_best_pix_fmt_of_2(enum AVPixelFormat dst_pix_fmt1, enum AVPixelFormat dst_pix_fmt2,
5668 enum AVPixelFormat src_pix_fmt, int has_alpha, int *loss_ptr);
5670 attribute_deprecated
5671 enum AVPixelFormat avcodec_find_best_pix_fmt2(enum AVPixelFormat dst_pix_fmt1, enum AVPixelFormat dst_pix_fmt2,
5672 enum AVPixelFormat src_pix_fmt, int has_alpha, int *loss_ptr);
5674 enum AVPixelFormat avcodec_default_get_format(struct AVCodecContext *s, const enum AVPixelFormat * fmt);
5680 #if FF_API_TAG_STRING
5682 * Put a string representing the codec tag codec_tag in buf.
5684 * @param buf buffer to place codec tag in
5685 * @param buf_size size in bytes of buf
5686 * @param codec_tag codec tag to assign
5687 * @return the length of the string that would have been generated if
5688 * enough space had been available, excluding the trailing null
5690 * @deprecated see av_fourcc_make_string() and av_fourcc2str().
5692 attribute_deprecated
5693 size_t av_get_codec_tag_string(char *buf, size_t buf_size, unsigned int codec_tag);
5696 void avcodec_string(char *buf, int buf_size, AVCodecContext *enc, int encode);
5699 * Return a name for the specified profile, if available.
5701 * @param codec the codec that is searched for the given profile
5702 * @param profile the profile value for which a name is requested
5703 * @return A name for the profile if found, NULL otherwise.
5705 const char *av_get_profile_name(const AVCodec *codec, int profile);
5708 * Return a name for the specified profile, if available.
5710 * @param codec_id the ID of the codec to which the requested profile belongs
5711 * @param profile the profile value for which a name is requested
5712 * @return A name for the profile if found, NULL otherwise.
5714 * @note unlike av_get_profile_name(), which searches a list of profiles
5715 * supported by a specific decoder or encoder implementation, this
5716 * function searches the list of profiles from the AVCodecDescriptor
5718 const char *avcodec_profile_name(enum AVCodecID codec_id, int profile);
5720 int avcodec_default_execute(AVCodecContext *c, int (*func)(AVCodecContext *c2, void *arg2),void *arg, int *ret, int count, int size);
5721 int avcodec_default_execute2(AVCodecContext *c, int (*func)(AVCodecContext *c2, void *arg2, int, int),void *arg, int *ret, int count);
5722 //FIXME func typedef
5725 * Fill AVFrame audio data and linesize pointers.
5727 * The buffer buf must be a preallocated buffer with a size big enough
5728 * to contain the specified samples amount. The filled AVFrame data
5729 * pointers will point to this buffer.
5731 * AVFrame extended_data channel pointers are allocated if necessary for
5734 * @param frame the AVFrame
5735 * frame->nb_samples must be set prior to calling the
5736 * function. This function fills in frame->data,
5737 * frame->extended_data, frame->linesize[0].
5738 * @param nb_channels channel count
5739 * @param sample_fmt sample format
5740 * @param buf buffer to use for frame data
5741 * @param buf_size size of buffer
5742 * @param align plane size sample alignment (0 = default)
5743 * @return >=0 on success, negative error code on failure
5744 * @todo return the size in bytes required to store the samples in
5745 * case of success, at the next libavutil bump
5747 int avcodec_fill_audio_frame(AVFrame *frame, int nb_channels,
5748 enum AVSampleFormat sample_fmt, const uint8_t *buf,
5749 int buf_size, int align);
5752 * Reset the internal decoder state / flush internal buffers. Should be called
5753 * e.g. when seeking or when switching to a different stream.
5755 * @note when refcounted frames are not used (i.e. avctx->refcounted_frames is 0),
5756 * this invalidates the frames previously returned from the decoder. When
5757 * refcounted frames are used, the decoder just releases any references it might
5758 * keep internally, but the caller's reference remains valid.
5760 void avcodec_flush_buffers(AVCodecContext *avctx);
5763 * Return codec bits per sample.
5765 * @param[in] codec_id the codec
5766 * @return Number of bits per sample or zero if unknown for the given codec.
5768 int av_get_bits_per_sample(enum AVCodecID codec_id);
5771 * Return the PCM codec associated with a sample format.
5772 * @param be endianness, 0 for little, 1 for big,
5773 * -1 (or anything else) for native
5774 * @return AV_CODEC_ID_PCM_* or AV_CODEC_ID_NONE
5776 enum AVCodecID av_get_pcm_codec(enum AVSampleFormat fmt, int be);
5779 * Return codec bits per sample.
5780 * Only return non-zero if the bits per sample is exactly correct, not an
5783 * @param[in] codec_id the codec
5784 * @return Number of bits per sample or zero if unknown for the given codec.
5786 int av_get_exact_bits_per_sample(enum AVCodecID codec_id);
5789 * Return audio frame duration.
5791 * @param avctx codec context
5792 * @param frame_bytes size of the frame, or 0 if unknown
5793 * @return frame duration, in samples, if known. 0 if not able to
5796 int av_get_audio_frame_duration(AVCodecContext *avctx, int frame_bytes);
5799 * This function is the same as av_get_audio_frame_duration(), except it works
5800 * with AVCodecParameters instead of an AVCodecContext.
5802 int av_get_audio_frame_duration2(AVCodecParameters *par, int frame_bytes);
5805 typedef struct AVBitStreamFilterContext {
5807 const struct AVBitStreamFilter *filter;
5808 AVCodecParserContext *parser;
5809 struct AVBitStreamFilterContext *next;
5811 * Internal default arguments, used if NULL is passed to av_bitstream_filter_filter().
5812 * Not for access by library users.
5815 } AVBitStreamFilterContext;
5818 typedef struct AVBSFInternal AVBSFInternal;
5821 * The bitstream filter state.
5823 * This struct must be allocated with av_bsf_alloc() and freed with
5826 * The fields in the struct will only be changed (by the caller or by the
5827 * filter) as described in their documentation, and are to be considered
5828 * immutable otherwise.
5830 typedef struct AVBSFContext {
5832 * A class for logging and AVOptions
5834 const AVClass *av_class;
5837 * The bitstream filter this context is an instance of.
5839 const struct AVBitStreamFilter *filter;
5842 * Opaque libavcodec internal data. Must not be touched by the caller in any
5845 AVBSFInternal *internal;
5848 * Opaque filter-specific private data. If filter->priv_class is non-NULL,
5849 * this is an AVOptions-enabled struct.
5854 * Parameters of the input stream. This field is allocated in
5855 * av_bsf_alloc(), it needs to be filled by the caller before
5858 AVCodecParameters *par_in;
5861 * Parameters of the output stream. This field is allocated in
5862 * av_bsf_alloc(), it is set by the filter in av_bsf_init().
5864 AVCodecParameters *par_out;
5867 * The timebase used for the timestamps of the input packets. Set by the
5868 * caller before av_bsf_init().
5870 AVRational time_base_in;
5873 * The timebase used for the timestamps of the output packets. Set by the
5874 * filter in av_bsf_init().
5876 AVRational time_base_out;
5879 typedef struct AVBitStreamFilter {
5883 * A list of codec ids supported by the filter, terminated by
5885 * May be NULL, in that case the bitstream filter works with any codec id.
5887 const enum AVCodecID *codec_ids;
5890 * A class for the private data, used to declare bitstream filter private
5891 * AVOptions. This field is NULL for bitstream filters that do not declare
5894 * If this field is non-NULL, the first member of the filter private data
5895 * must be a pointer to AVClass, which will be set by libavcodec generic
5896 * code to this class.
5898 const AVClass *priv_class;
5900 /*****************************************************************
5901 * No fields below this line are part of the public API. They
5902 * may not be used outside of libavcodec and can be changed and
5904 * New public fields should be added right above.
5905 *****************************************************************
5909 int (*init)(AVBSFContext *ctx);
5910 int (*filter)(AVBSFContext *ctx, AVPacket *pkt);
5911 void (*close)(AVBSFContext *ctx);
5912 void (*flush)(AVBSFContext *ctx);
5913 } AVBitStreamFilter;
5917 * @deprecated the old bitstream filtering API (using AVBitStreamFilterContext)
5918 * is deprecated. Use the new bitstream filtering API (using AVBSFContext).
5920 attribute_deprecated
5921 void av_register_bitstream_filter(AVBitStreamFilter *bsf);
5923 * @deprecated the old bitstream filtering API (using AVBitStreamFilterContext)
5924 * is deprecated. Use av_bsf_get_by_name(), av_bsf_alloc(), and av_bsf_init()
5925 * from the new bitstream filtering API (using AVBSFContext).
5927 attribute_deprecated
5928 AVBitStreamFilterContext *av_bitstream_filter_init(const char *name);
5930 * @deprecated the old bitstream filtering API (using AVBitStreamFilterContext)
5931 * is deprecated. Use av_bsf_send_packet() and av_bsf_receive_packet() from the
5932 * new bitstream filtering API (using AVBSFContext).
5934 attribute_deprecated
5935 int av_bitstream_filter_filter(AVBitStreamFilterContext *bsfc,
5936 AVCodecContext *avctx, const char *args,
5937 uint8_t **poutbuf, int *poutbuf_size,
5938 const uint8_t *buf, int buf_size, int keyframe);
5940 * @deprecated the old bitstream filtering API (using AVBitStreamFilterContext)
5941 * is deprecated. Use av_bsf_free() from the new bitstream filtering API (using
5944 attribute_deprecated
5945 void av_bitstream_filter_close(AVBitStreamFilterContext *bsf);
5947 * @deprecated the old bitstream filtering API (using AVBitStreamFilterContext)
5948 * is deprecated. Use av_bsf_iterate() from the new bitstream filtering API (using
5951 attribute_deprecated
5952 const AVBitStreamFilter *av_bitstream_filter_next(const AVBitStreamFilter *f);
5956 * @return a bitstream filter with the specified name or NULL if no such
5957 * bitstream filter exists.
5959 const AVBitStreamFilter *av_bsf_get_by_name(const char *name);
5962 * Iterate over all registered bitstream filters.
5964 * @param opaque a pointer where libavcodec will store the iteration state. Must
5965 * point to NULL to start the iteration.
5967 * @return the next registered bitstream filter or NULL when the iteration is
5970 const AVBitStreamFilter *av_bsf_iterate(void **opaque);
5972 attribute_deprecated
5973 const AVBitStreamFilter *av_bsf_next(void **opaque);
5977 * Allocate a context for a given bitstream filter. The caller must fill in the
5978 * context parameters as described in the documentation and then call
5979 * av_bsf_init() before sending any data to the filter.
5981 * @param filter the filter for which to allocate an instance.
5982 * @param ctx a pointer into which the pointer to the newly-allocated context
5983 * will be written. It must be freed with av_bsf_free() after the
5984 * filtering is done.
5986 * @return 0 on success, a negative AVERROR code on failure
5988 int av_bsf_alloc(const AVBitStreamFilter *filter, AVBSFContext **ctx);
5991 * Prepare the filter for use, after all the parameters and options have been
5994 int av_bsf_init(AVBSFContext *ctx);
5997 * Submit a packet for filtering.
5999 * After sending each packet, the filter must be completely drained by calling
6000 * av_bsf_receive_packet() repeatedly until it returns AVERROR(EAGAIN) or
6003 * @param pkt the packet to filter. The bitstream filter will take ownership of
6004 * the packet and reset the contents of pkt. pkt is not touched if an error occurs.
6005 * If pkt is empty (i.e. NULL, or pkt->data is NULL and pkt->side_data_elems zero),
6006 * it signals the end of the stream (i.e. no more non-empty packets will be sent;
6007 * sending more empty packets does nothing) and will cause the filter to output
6008 * any packets it may have buffered internally.
6010 * @return 0 on success, a negative AVERROR on error. This function never fails if
6013 int av_bsf_send_packet(AVBSFContext *ctx, AVPacket *pkt);
6016 * Retrieve a filtered packet.
6018 * @param[out] pkt this struct will be filled with the contents of the filtered
6019 * packet. It is owned by the caller and must be freed using
6020 * av_packet_unref() when it is no longer needed.
6021 * This parameter should be "clean" (i.e. freshly allocated
6022 * with av_packet_alloc() or unreffed with av_packet_unref())
6023 * when this function is called. If this function returns
6024 * successfully, the contents of pkt will be completely
6025 * overwritten by the returned data. On failure, pkt is not
6028 * @return 0 on success. AVERROR(EAGAIN) if more packets need to be sent to the
6029 * filter (using av_bsf_send_packet()) to get more output. AVERROR_EOF if there
6030 * will be no further output from the filter. Another negative AVERROR value if
6033 * @note one input packet may result in several output packets, so after sending
6034 * a packet with av_bsf_send_packet(), this function needs to be called
6035 * repeatedly until it stops returning 0. It is also possible for a filter to
6036 * output fewer packets than were sent to it, so this function may return
6037 * AVERROR(EAGAIN) immediately after a successful av_bsf_send_packet() call.
6039 int av_bsf_receive_packet(AVBSFContext *ctx, AVPacket *pkt);
6042 * Reset the internal bitstream filter state / flush internal buffers.
6044 void av_bsf_flush(AVBSFContext *ctx);
6047 * Free a bitstream filter context and everything associated with it; write NULL
6048 * into the supplied pointer.
6050 void av_bsf_free(AVBSFContext **ctx);
6053 * Get the AVClass for AVBSFContext. It can be used in combination with
6054 * AV_OPT_SEARCH_FAKE_OBJ for examining options.
6056 * @see av_opt_find().
6058 const AVClass *av_bsf_get_class(void);
6061 * Structure for chain/list of bitstream filters.
6062 * Empty list can be allocated by av_bsf_list_alloc().
6064 typedef struct AVBSFList AVBSFList;
6067 * Allocate empty list of bitstream filters.
6068 * The list must be later freed by av_bsf_list_free()
6069 * or finalized by av_bsf_list_finalize().
6071 * @return Pointer to @ref AVBSFList on success, NULL in case of failure
6073 AVBSFList *av_bsf_list_alloc(void);
6076 * Free list of bitstream filters.
6078 * @param lst Pointer to pointer returned by av_bsf_list_alloc()
6080 void av_bsf_list_free(AVBSFList **lst);
6083 * Append bitstream filter to the list of bitstream filters.
6085 * @param lst List to append to
6086 * @param bsf Filter context to be appended
6088 * @return >=0 on success, negative AVERROR in case of failure
6090 int av_bsf_list_append(AVBSFList *lst, AVBSFContext *bsf);
6093 * Construct new bitstream filter context given it's name and options
6094 * and append it to the list of bitstream filters.
6096 * @param lst List to append to
6097 * @param bsf_name Name of the bitstream filter
6098 * @param options Options for the bitstream filter, can be set to NULL
6100 * @return >=0 on success, negative AVERROR in case of failure
6102 int av_bsf_list_append2(AVBSFList *lst, const char * bsf_name, AVDictionary **options);
6104 * Finalize list of bitstream filters.
6106 * This function will transform @ref AVBSFList to single @ref AVBSFContext,
6107 * so the whole chain of bitstream filters can be treated as single filter
6108 * freshly allocated by av_bsf_alloc().
6109 * If the call is successful, @ref AVBSFList structure is freed and lst
6110 * will be set to NULL. In case of failure, caller is responsible for
6111 * freeing the structure by av_bsf_list_free()
6113 * @param lst Filter list structure to be transformed
6114 * @param[out] bsf Pointer to be set to newly created @ref AVBSFContext structure
6115 * representing the chain of bitstream filters
6117 * @return >=0 on success, negative AVERROR in case of failure
6119 int av_bsf_list_finalize(AVBSFList **lst, AVBSFContext **bsf);
6122 * Parse string describing list of bitstream filters and create single
6123 * @ref AVBSFContext describing the whole chain of bitstream filters.
6124 * Resulting @ref AVBSFContext can be treated as any other @ref AVBSFContext freshly
6125 * allocated by av_bsf_alloc().
6127 * @param str String describing chain of bitstream filters in format
6128 * `bsf1[=opt1=val1:opt2=val2][,bsf2]`
6129 * @param[out] bsf Pointer to be set to newly created @ref AVBSFContext structure
6130 * representing the chain of bitstream filters
6132 * @return >=0 on success, negative AVERROR in case of failure
6134 int av_bsf_list_parse_str(const char *str, AVBSFContext **bsf);
6137 * Get null/pass-through bitstream filter.
6139 * @param[out] bsf Pointer to be set to new instance of pass-through bitstream filter
6143 int av_bsf_get_null_filter(AVBSFContext **bsf);
6148 * Same behaviour av_fast_malloc but the buffer has additional
6149 * AV_INPUT_BUFFER_PADDING_SIZE at the end which will always be 0.
6151 * In addition the whole buffer will initially and after resizes
6152 * be 0-initialized so that no uninitialized data will ever appear.
6154 void av_fast_padded_malloc(void *ptr, unsigned int *size, size_t min_size);
6157 * Same behaviour av_fast_padded_malloc except that buffer will always
6158 * be 0-initialized after call.
6160 void av_fast_padded_mallocz(void *ptr, unsigned int *size, size_t min_size);
6163 * Encode extradata length to a buffer. Used by xiph codecs.
6165 * @param s buffer to write to; must be at least (v/255+1) bytes long
6166 * @param v size of extradata in bytes
6167 * @return number of bytes written to the buffer.
6169 unsigned int av_xiphlacing(unsigned char *s, unsigned int v);
6171 #if FF_API_USER_VISIBLE_AVHWACCEL
6173 * Register the hardware accelerator hwaccel.
6175 * @deprecated This function doesn't do anything.
6177 attribute_deprecated
6178 void av_register_hwaccel(AVHWAccel *hwaccel);
6181 * If hwaccel is NULL, returns the first registered hardware accelerator,
6182 * if hwaccel is non-NULL, returns the next registered hardware accelerator
6183 * after hwaccel, or NULL if hwaccel is the last one.
6185 * @deprecated AVHWaccel structures contain no user-serviceable parts, so
6186 * this function should not be used.
6188 attribute_deprecated
6189 AVHWAccel *av_hwaccel_next(const AVHWAccel *hwaccel);
6194 * Lock operation used by lockmgr
6196 * @deprecated Deprecated together with av_lockmgr_register().
6199 AV_LOCK_CREATE, ///< Create a mutex
6200 AV_LOCK_OBTAIN, ///< Lock the mutex
6201 AV_LOCK_RELEASE, ///< Unlock the mutex
6202 AV_LOCK_DESTROY, ///< Free mutex resources
6206 * Register a user provided lock manager supporting the operations
6207 * specified by AVLockOp. The "mutex" argument to the function points
6208 * to a (void *) where the lockmgr should store/get a pointer to a user
6209 * allocated mutex. It is NULL upon AV_LOCK_CREATE and equal to the
6210 * value left by the last call for all other ops. If the lock manager is
6211 * unable to perform the op then it should leave the mutex in the same
6212 * state as when it was called and return a non-zero value. However,
6213 * when called with AV_LOCK_DESTROY the mutex will always be assumed to
6214 * have been successfully destroyed. If av_lockmgr_register succeeds
6215 * it will return a non-negative value, if it fails it will return a
6216 * negative value and destroy all mutex and unregister all callbacks.
6217 * av_lockmgr_register is not thread-safe, it must be called from a
6218 * single thread before any calls which make use of locking are used.
6220 * @param cb User defined callback. av_lockmgr_register invokes calls
6221 * to this callback and the previously registered callback.
6222 * The callback will be used to create more than one mutex
6223 * each of which must be backed by its own underlying locking
6224 * mechanism (i.e. do not use a single static object to
6225 * implement your lock manager). If cb is set to NULL the
6226 * lockmgr will be unregistered.
6228 * @deprecated This function does nothing, and always returns 0. Be sure to
6229 * build with thread support to get basic thread safety.
6231 attribute_deprecated
6232 int av_lockmgr_register(int (*cb)(void **mutex, enum AVLockOp op));
6236 * Get the type of the given codec.
6238 enum AVMediaType avcodec_get_type(enum AVCodecID codec_id);
6241 * Get the name of a codec.
6242 * @return a static string identifying the codec; never NULL
6244 const char *avcodec_get_name(enum AVCodecID id);
6247 * @return a positive value if s is open (i.e. avcodec_open2() was called on it
6248 * with no corresponding avcodec_close()), 0 otherwise.
6250 int avcodec_is_open(AVCodecContext *s);
6253 * @return a non-zero number if codec is an encoder, zero otherwise
6255 int av_codec_is_encoder(const AVCodec *codec);
6258 * @return a non-zero number if codec is a decoder, zero otherwise
6260 int av_codec_is_decoder(const AVCodec *codec);
6263 * @return descriptor for given codec ID or NULL if no descriptor exists.
6265 const AVCodecDescriptor *avcodec_descriptor_get(enum AVCodecID id);
6268 * Iterate over all codec descriptors known to libavcodec.
6270 * @param prev previous descriptor. NULL to get the first descriptor.
6272 * @return next descriptor or NULL after the last descriptor
6274 const AVCodecDescriptor *avcodec_descriptor_next(const AVCodecDescriptor *prev);
6277 * @return codec descriptor with the given name or NULL if no such descriptor
6280 const AVCodecDescriptor *avcodec_descriptor_get_by_name(const char *name);
6283 * Allocate a CPB properties structure and initialize its fields to default
6286 * @param size if non-NULL, the size of the allocated struct will be written
6287 * here. This is useful for embedding it in side data.
6289 * @return the newly allocated struct or NULL on failure
6291 AVCPBProperties *av_cpb_properties_alloc(size_t *size);
6297 #endif /* AVCODEC_AVCODEC_H */