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* copyright (c) 2001 Fabrice Bellard
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* This file is part of Libav.
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* Libav is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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* Libav is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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* You should have received a copy of the GNU Lesser General Public
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* License along with Libav; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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#ifndef AVCODEC_AVCODEC_H
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#define AVCODEC_AVCODEC_H
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#include "libavutil/samplefmt.h"
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#include "libavutil/avutil.h"
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#include "libavutil/cpu.h"
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#include "libavcodec/version.h"
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* Identify the syntax and semantics of the bitstream.
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* The principle is roughly:
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* Two decoders with the same ID can decode the same streams.
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* Two encoders with the same ID can encode compatible streams.
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* There may be slight deviations from the principle due to implementation
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* If you add a codec ID to this list, add it so that
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* 1. no value of a existing codec ID changes (that would break ABI),
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* 2. it is as close as possible to similar codecs.
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CODEC_ID_MPEG2VIDEO, ///< preferred ID for MPEG-1/2 video decoding
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CODEC_ID_MPEG2VIDEO_XVMC,
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CODEC_ID_INTERPLAY_VIDEO,
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CODEC_ID_TRUEMOTION1,
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CODEC_ID_TRUEMOTION2,
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CODEC_ID_DSICINVIDEO,
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CODEC_ID_TIERTEXSEQVIDEO,
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CODEC_ID_BETHSOFTVID,
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CODEC_ID_MOTIONPIXELS,
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CODEC_ID_IFF_BYTERUN1,
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/* various PCM "codecs" */
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CODEC_ID_PCM_S16LE= 0x10000,
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CODEC_ID_PCM_S24DAUD,
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CODEC_ID_PCM_S16LE_PLANAR,
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/* various ADPCM codecs */
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CODEC_ID_ADPCM_IMA_QT= 0x11000,
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CODEC_ID_ADPCM_IMA_WAV,
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CODEC_ID_ADPCM_IMA_DK3,
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CODEC_ID_ADPCM_IMA_DK4,
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CODEC_ID_ADPCM_IMA_WS,
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CODEC_ID_ADPCM_IMA_SMJPEG,
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CODEC_ID_ADPCM_YAMAHA,
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CODEC_ID_ADPCM_SBPRO_4,
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CODEC_ID_ADPCM_SBPRO_3,
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CODEC_ID_ADPCM_SBPRO_2,
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CODEC_ID_ADPCM_IMA_AMV,
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CODEC_ID_ADPCM_EA_R1,
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CODEC_ID_ADPCM_EA_R3,
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CODEC_ID_ADPCM_EA_R2,
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CODEC_ID_ADPCM_IMA_EA_SEAD,
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CODEC_ID_ADPCM_IMA_EA_EACS,
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CODEC_ID_ADPCM_EA_XAS,
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CODEC_ID_ADPCM_EA_MAXIS_XA,
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CODEC_ID_ADPCM_IMA_ISS,
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CODEC_ID_AMR_NB= 0x12000,
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/* RealAudio codecs*/
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CODEC_ID_RA_144= 0x13000,
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/* various DPCM codecs */
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CODEC_ID_ROQ_DPCM= 0x14000,
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CODEC_ID_INTERPLAY_DPCM,
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CODEC_ID_MP2= 0x15000,
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CODEC_ID_MP3, ///< preferred ID for decoding MPEG audio layer 1, 2 or 3
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CODEC_ID_WESTWOOD_SND1,
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CODEC_ID_GSM, ///< as in Berlin toast format
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CODEC_ID_DSICINAUDIO,
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CODEC_ID_GSM_MS, /* as found in WAV */
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CODEC_ID_WMALOSSLESS,
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CODEC_ID_BINKAUDIO_RDFT,
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CODEC_ID_BINKAUDIO_DCT,
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/* subtitle codecs */
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CODEC_ID_DVD_SUBTITLE= 0x17000,
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CODEC_ID_DVB_SUBTITLE,
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CODEC_ID_TEXT, ///< raw UTF-8 text
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CODEC_ID_HDMV_PGS_SUBTITLE,
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CODEC_ID_DVB_TELETEXT,
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/* other specific kind of codecs (generally used for attachments) */
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CODEC_ID_TTF= 0x18000,
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CODEC_ID_PROBE= 0x19000, ///< codec_id is not known (like CODEC_ID_NONE) but lavf should attempt to identify it
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CODEC_ID_MPEG2TS= 0x20000, /**< _FAKE_ codec to indicate a raw MPEG-2 TS
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* stream (only used by libavformat) */
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CODEC_ID_FFMETADATA=0x21000, ///< Dummy codec for streams containing only metadata information.
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#if FF_API_OLD_SAMPLE_FMT
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#define SampleFormat AVSampleFormat
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#define SAMPLE_FMT_NONE AV_SAMPLE_FMT_NONE
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#define SAMPLE_FMT_U8 AV_SAMPLE_FMT_U8
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#define SAMPLE_FMT_S16 AV_SAMPLE_FMT_S16
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#define SAMPLE_FMT_S32 AV_SAMPLE_FMT_S32
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#define SAMPLE_FMT_FLT AV_SAMPLE_FMT_FLT
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#define SAMPLE_FMT_DBL AV_SAMPLE_FMT_DBL
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#define SAMPLE_FMT_NB AV_SAMPLE_FMT_NB
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#if FF_API_OLD_AUDIOCONVERT
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#include "libavutil/audioconvert.h"
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/* Audio channel masks */
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#define CH_FRONT_LEFT AV_CH_FRONT_LEFT
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#define CH_FRONT_RIGHT AV_CH_FRONT_RIGHT
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#define CH_FRONT_CENTER AV_CH_FRONT_CENTER
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#define CH_LOW_FREQUENCY AV_CH_LOW_FREQUENCY
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#define CH_BACK_LEFT AV_CH_BACK_LEFT
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#define CH_BACK_RIGHT AV_CH_BACK_RIGHT
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#define CH_FRONT_LEFT_OF_CENTER AV_CH_FRONT_LEFT_OF_CENTER
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#define CH_FRONT_RIGHT_OF_CENTER AV_CH_FRONT_RIGHT_OF_CENTER
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#define CH_BACK_CENTER AV_CH_BACK_CENTER
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#define CH_SIDE_LEFT AV_CH_SIDE_LEFT
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#define CH_SIDE_RIGHT AV_CH_SIDE_RIGHT
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#define CH_TOP_CENTER AV_CH_TOP_CENTER
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#define CH_TOP_FRONT_LEFT AV_CH_TOP_FRONT_LEFT
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#define CH_TOP_FRONT_CENTER AV_CH_TOP_FRONT_CENTER
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#define CH_TOP_FRONT_RIGHT AV_CH_TOP_FRONT_RIGHT
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#define CH_TOP_BACK_LEFT AV_CH_TOP_BACK_LEFT
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#define CH_TOP_BACK_CENTER AV_CH_TOP_BACK_CENTER
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#define CH_TOP_BACK_RIGHT AV_CH_TOP_BACK_RIGHT
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#define CH_STEREO_LEFT AV_CH_STEREO_LEFT
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#define CH_STEREO_RIGHT AV_CH_STEREO_RIGHT
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/** Channel mask value used for AVCodecContext.request_channel_layout
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to indicate that the user requests the channel order of the decoder output
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to be the native codec channel order. */
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#define CH_LAYOUT_NATIVE AV_CH_LAYOUT_NATIVE
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/* Audio channel convenience macros */
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#define CH_LAYOUT_MONO AV_CH_LAYOUT_MONO
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#define CH_LAYOUT_STEREO AV_CH_LAYOUT_STEREO
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#define CH_LAYOUT_2_1 AV_CH_LAYOUT_2_1
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#define CH_LAYOUT_SURROUND AV_CH_LAYOUT_SURROUND
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#define CH_LAYOUT_4POINT0 AV_CH_LAYOUT_4POINT0
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#define CH_LAYOUT_2_2 AV_CH_LAYOUT_2_2
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#define CH_LAYOUT_QUAD AV_CH_LAYOUT_QUAD
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#define CH_LAYOUT_5POINT0 AV_CH_LAYOUT_5POINT0
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#define CH_LAYOUT_5POINT1 AV_CH_LAYOUT_5POINT1
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#define CH_LAYOUT_5POINT0_BACK AV_CH_LAYOUT_5POINT0_BACK
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#define CH_LAYOUT_5POINT1_BACK AV_CH_LAYOUT_5POINT1_BACK
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#define CH_LAYOUT_7POINT0 AV_CH_LAYOUT_7POINT0
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#define CH_LAYOUT_7POINT1 AV_CH_LAYOUT_7POINT1
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#define CH_LAYOUT_7POINT1_WIDE AV_CH_LAYOUT_7POINT1_WIDE
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#define CH_LAYOUT_STEREO_DOWNMIX AV_CH_LAYOUT_STEREO_DOWNMIX
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#define AVCODEC_MAX_AUDIO_FRAME_SIZE 192000 // 1 second of 48khz 32bit audio
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* Required number of additionally allocated bytes at the end of the input bitstream for decoding.
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* This is mainly needed because some optimized bitstream readers read
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* 32 or 64 bit at once and could read over the end.<br>
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* Note: If the first 23 bits of the additional bytes are not 0, then damaged
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* MPEG bitstreams could cause overread and segfault.
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#define FF_INPUT_BUFFER_PADDING_SIZE 8
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* minimum encoding buffer size
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* Used to avoid some checks during header writing.
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#define FF_MIN_BUFFER_SIZE 16384
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* motion estimation type.
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ME_ZERO = 1, ///< no search, that is use 0,0 vector whenever one is needed
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ME_EPZS, ///< enhanced predictive zonal search
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ME_X1, ///< reserved for experiments
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ME_HEX, ///< hexagon based search
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ME_UMH, ///< uneven multi-hexagon search
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ME_ITER, ///< iterative search
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ME_TESA, ///< transformed exhaustive search algorithm
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/* We leave some space between them for extensions (drop some
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* keyframes for intra-only or drop just some bidir frames). */
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AVDISCARD_NONE =-16, ///< discard nothing
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AVDISCARD_DEFAULT= 0, ///< discard useless packets like 0 size packets in avi
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AVDISCARD_NONREF = 8, ///< discard all non reference
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AVDISCARD_BIDIR = 16, ///< discard all bidirectional frames
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AVDISCARD_NONKEY = 32, ///< discard all frames except keyframes
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AVDISCARD_ALL = 48, ///< discard all
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enum AVColorPrimaries{
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AVCOL_PRI_BT709 =1, ///< also ITU-R BT1361 / IEC 61966-2-4 / SMPTE RP177 Annex B
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AVCOL_PRI_UNSPECIFIED=2,
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AVCOL_PRI_BT470BG =5, ///< also ITU-R BT601-6 625 / ITU-R BT1358 625 / ITU-R BT1700 625 PAL & SECAM
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AVCOL_PRI_SMPTE170M =6, ///< also ITU-R BT601-6 525 / ITU-R BT1358 525 / ITU-R BT1700 NTSC
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AVCOL_PRI_SMPTE240M =7, ///< functionally identical to above
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AVCOL_PRI_NB , ///< Not part of ABI
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enum AVColorTransferCharacteristic{
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AVCOL_TRC_BT709 =1, ///< also ITU-R BT1361
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AVCOL_TRC_UNSPECIFIED=2,
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AVCOL_TRC_GAMMA22 =4, ///< also ITU-R BT470M / ITU-R BT1700 625 PAL & SECAM
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AVCOL_TRC_GAMMA28 =5, ///< also ITU-R BT470BG
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AVCOL_TRC_NB , ///< Not part of ABI
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AVCOL_SPC_BT709 =1, ///< also ITU-R BT1361 / IEC 61966-2-4 xvYCC709 / SMPTE RP177 Annex B
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AVCOL_SPC_UNSPECIFIED=2,
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AVCOL_SPC_BT470BG =5, ///< also ITU-R BT601-6 625 / ITU-R BT1358 625 / ITU-R BT1700 625 PAL & SECAM / IEC 61966-2-4 xvYCC601
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AVCOL_SPC_SMPTE170M =6, ///< also ITU-R BT601-6 525 / ITU-R BT1358 525 / ITU-R BT1700 NTSC / functionally identical to above
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AVCOL_SPC_SMPTE240M =7,
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AVCOL_SPC_NB , ///< Not part of ABI
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AVCOL_RANGE_UNSPECIFIED=0,
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AVCOL_RANGE_MPEG =1, ///< the normal 219*2^(n-8) "MPEG" YUV ranges
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AVCOL_RANGE_JPEG =2, ///< the normal 2^n-1 "JPEG" YUV ranges
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AVCOL_RANGE_NB , ///< Not part of ABI
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* X X 3 4 X X are luma samples,
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* 1 2 1-6 are possible chroma positions
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* X X 5 6 X 0 is undefined/unknown position
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enum AVChromaLocation{
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AVCHROMA_LOC_UNSPECIFIED=0,
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AVCHROMA_LOC_LEFT =1, ///< mpeg2/4, h264 default
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AVCHROMA_LOC_CENTER =2, ///< mpeg1, jpeg, h263
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AVCHROMA_LOC_TOPLEFT =3, ///< DV
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AVCHROMA_LOC_BOTTOMLEFT =5,
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AVCHROMA_LOC_BOTTOM =6,
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AVCHROMA_LOC_NB , ///< Not part of ABI
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#if FF_API_FLAC_GLOBAL_OPTS
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attribute_deprecated enum AVLPCType {
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AV_LPC_TYPE_DEFAULT = -1, ///< use the codec default LPC type
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AV_LPC_TYPE_NONE = 0, ///< do not use LPC prediction or use all zero coefficients
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AV_LPC_TYPE_FIXED = 1, ///< fixed LPC coefficients
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AV_LPC_TYPE_LEVINSON = 2, ///< Levinson-Durbin recursion
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AV_LPC_TYPE_CHOLESKY = 3, ///< Cholesky factorization
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AV_LPC_TYPE_NB , ///< Not part of ABI
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enum AVAudioServiceType {
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AV_AUDIO_SERVICE_TYPE_MAIN = 0,
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AV_AUDIO_SERVICE_TYPE_EFFECTS = 1,
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AV_AUDIO_SERVICE_TYPE_VISUALLY_IMPAIRED = 2,
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AV_AUDIO_SERVICE_TYPE_HEARING_IMPAIRED = 3,
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AV_AUDIO_SERVICE_TYPE_DIALOGUE = 4,
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AV_AUDIO_SERVICE_TYPE_COMMENTARY = 5,
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AV_AUDIO_SERVICE_TYPE_EMERGENCY = 6,
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AV_AUDIO_SERVICE_TYPE_VOICE_OVER = 7,
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AV_AUDIO_SERVICE_TYPE_KARAOKE = 8,
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AV_AUDIO_SERVICE_TYPE_NB , ///< Not part of ABI
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typedef struct RcOverride{
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int qscale; // If this is 0 then quality_factor will be used instead.
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float quality_factor;
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#define FF_MAX_B_FRAMES 16
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These flags can be passed in AVCodecContext.flags before initialization.
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Note: Not everything is supported yet.
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#define CODEC_FLAG_QSCALE 0x0002 ///< Use fixed qscale.
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#define CODEC_FLAG_4MV 0x0004 ///< 4 MV per MB allowed / advanced prediction for H.263.
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#define CODEC_FLAG_QPEL 0x0010 ///< Use qpel MC.
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#define CODEC_FLAG_GMC 0x0020 ///< Use GMC.
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#define CODEC_FLAG_MV0 0x0040 ///< Always try a MB with MV=<0,0>.
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#define CODEC_FLAG_PART 0x0080 ///< Use data partitioning.
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* The parent program guarantees that the input for B-frames containing
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* streams is not written to for at least s->max_b_frames+1 frames, if
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* this is not set the input will be copied.
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#define CODEC_FLAG_INPUT_PRESERVED 0x0100
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#define CODEC_FLAG_PASS1 0x0200 ///< Use internal 2pass ratecontrol in first pass mode.
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#define CODEC_FLAG_PASS2 0x0400 ///< Use internal 2pass ratecontrol in second pass mode.
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#define CODEC_FLAG_EXTERN_HUFF 0x1000 ///< Use external Huffman table (for MJPEG).
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#define CODEC_FLAG_GRAY 0x2000 ///< Only decode/encode grayscale.
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#define CODEC_FLAG_EMU_EDGE 0x4000 ///< Don't draw edges.
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#define CODEC_FLAG_PSNR 0x8000 ///< error[?] variables will be set during encoding.
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#define CODEC_FLAG_TRUNCATED 0x00010000 /** Input bitstream might be truncated at a random
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location instead of only at frame boundaries. */
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#define CODEC_FLAG_NORMALIZE_AQP 0x00020000 ///< Normalize adaptive quantization.
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#define CODEC_FLAG_INTERLACED_DCT 0x00040000 ///< Use interlaced DCT.
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#define CODEC_FLAG_LOW_DELAY 0x00080000 ///< Force low delay.
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#define CODEC_FLAG_ALT_SCAN 0x00100000 ///< Use alternate scan.
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#define CODEC_FLAG_GLOBAL_HEADER 0x00400000 ///< Place global headers in extradata instead of every keyframe.
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#define CODEC_FLAG_BITEXACT 0x00800000 ///< Use only bitexact stuff (except (I)DCT).
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/* Fx : Flag for h263+ extra options */
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#define CODEC_FLAG_AC_PRED 0x01000000 ///< H.263 advanced intra coding / MPEG-4 AC prediction
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#define CODEC_FLAG_H263P_UMV 0x02000000 ///< unlimited motion vector
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#define CODEC_FLAG_CBP_RD 0x04000000 ///< Use rate distortion optimization for cbp.
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#define CODEC_FLAG_QP_RD 0x08000000 ///< Use rate distortion optimization for qp selectioon.
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#define CODEC_FLAG_H263P_AIV 0x00000008 ///< H.263 alternative inter VLC
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#define CODEC_FLAG_OBMC 0x00000001 ///< OBMC
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#define CODEC_FLAG_LOOP_FILTER 0x00000800 ///< loop filter
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#define CODEC_FLAG_H263P_SLICE_STRUCT 0x10000000
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#define CODEC_FLAG_INTERLACED_ME 0x20000000 ///< interlaced motion estimation
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#define CODEC_FLAG_SVCD_SCAN_OFFSET 0x40000000 ///< Will reserve space for SVCD scan offset user data.
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#define CODEC_FLAG_CLOSED_GOP 0x80000000
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#define CODEC_FLAG2_FAST 0x00000001 ///< Allow non spec compliant speedup tricks.
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#define CODEC_FLAG2_STRICT_GOP 0x00000002 ///< Strictly enforce GOP size.
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#define CODEC_FLAG2_NO_OUTPUT 0x00000004 ///< Skip bitstream encoding.
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#define CODEC_FLAG2_LOCAL_HEADER 0x00000008 ///< Place global headers at every keyframe instead of in extradata.
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#define CODEC_FLAG2_BPYRAMID 0x00000010 ///< H.264 allow B-frames to be used as references.
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#define CODEC_FLAG2_WPRED 0x00000020 ///< H.264 weighted biprediction for B-frames
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#define CODEC_FLAG2_MIXED_REFS 0x00000040 ///< H.264 one reference per partition, as opposed to one reference per macroblock
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#define CODEC_FLAG2_8X8DCT 0x00000080 ///< H.264 high profile 8x8 transform
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#define CODEC_FLAG2_FASTPSKIP 0x00000100 ///< H.264 fast pskip
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#define CODEC_FLAG2_AUD 0x00000200 ///< H.264 access unit delimiters
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#define CODEC_FLAG2_BRDO 0x00000400 ///< B-frame rate-distortion optimization
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#define CODEC_FLAG2_INTRA_VLC 0x00000800 ///< Use MPEG-2 intra VLC table.
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#define CODEC_FLAG2_MEMC_ONLY 0x00001000 ///< Only do ME/MC (I frames -> ref, P frame -> ME+MC).
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#define CODEC_FLAG2_DROP_FRAME_TIMECODE 0x00002000 ///< timecode is in drop frame format.
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#define CODEC_FLAG2_SKIP_RD 0x00004000 ///< RD optimal MB level residual skipping
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#define CODEC_FLAG2_CHUNKS 0x00008000 ///< Input bitstream might be truncated at a packet boundaries instead of only at frame boundaries.
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#define CODEC_FLAG2_NON_LINEAR_QUANT 0x00010000 ///< Use MPEG-2 nonlinear quantizer.
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#define CODEC_FLAG2_BIT_RESERVOIR 0x00020000 ///< Use a bit reservoir when encoding if possible
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#define CODEC_FLAG2_MBTREE 0x00040000 ///< Use macroblock tree ratecontrol (x264 only)
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#define CODEC_FLAG2_PSY 0x00080000 ///< Use psycho visual optimizations.
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#define CODEC_FLAG2_SSIM 0x00100000 ///< Compute SSIM during encoding, error[] values are undefined.
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#define CODEC_FLAG2_INTRA_REFRESH 0x00200000 ///< Use periodic insertion of intra blocks instead of keyframes.
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/* Unsupported options :
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* Syntax Arithmetic coding (SAC)
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* Reference Picture Selection
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* Independent Segment Decoding */
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/* codec capabilities */
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#define CODEC_CAP_DRAW_HORIZ_BAND 0x0001 ///< Decoder can use draw_horiz_band callback.
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* Codec uses get_buffer() for allocating buffers and supports custom allocators.
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* If not set, it might not use get_buffer() at all or use operations that
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* assume the buffer was allocated by avcodec_default_get_buffer.
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#define CODEC_CAP_DR1 0x0002
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/* If 'parse_only' field is true, then avcodec_parse_frame() can be used. */
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#define CODEC_CAP_PARSE_ONLY 0x0004
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#define CODEC_CAP_TRUNCATED 0x0008
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/* Codec can export data for HW decoding (XvMC). */
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#define CODEC_CAP_HWACCEL 0x0010
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* Codec has a nonzero delay and needs to be fed with NULL at the end to get the delayed data.
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* If this is not set, the codec is guaranteed to never be fed with NULL data.
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#define CODEC_CAP_DELAY 0x0020
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* Codec can be fed a final frame with a smaller size.
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* This can be used to prevent truncation of the last audio samples.
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#define CODEC_CAP_SMALL_LAST_FRAME 0x0040
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* Codec can export data for HW decoding (VDPAU).
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#define CODEC_CAP_HWACCEL_VDPAU 0x0080
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* Codec can output multiple frames per AVPacket
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* Normally demuxers return one frame at a time, demuxers which do not do
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* are connected to a parser to split what they return into proper frames.
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* This flag is reserved to the very rare category of codecs which have a
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* bitstream that cannot be split into frames without timeconsuming
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* operations like full decoding. Demuxers carring such bitstreams thus
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* may return multiple frames in a packet. This has many disadvantages like
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* prohibiting stream copy in many cases thus it should only be considered
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#define CODEC_CAP_SUBFRAMES 0x0100
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* Codec is experimental and is thus avoided in favor of non experimental
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#define CODEC_CAP_EXPERIMENTAL 0x0200
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* Codec should fill in channel configuration and samplerate instead of container
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#define CODEC_CAP_CHANNEL_CONF 0x0400
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* Codec is able to deal with negative linesizes
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#define CODEC_CAP_NEG_LINESIZES 0x0800
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* Codec supports frame-level multithreading.
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#define CODEC_CAP_FRAME_THREADS 0x1000
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* Codec supports slice-based (or partition-based) multithreading.
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#define CODEC_CAP_SLICE_THREADS 0x2000
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//The following defines may change, don't expect compatibility if you use them.
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#define MB_TYPE_INTRA4x4 0x0001
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#define MB_TYPE_INTRA16x16 0x0002 //FIXME H.264-specific
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#define MB_TYPE_INTRA_PCM 0x0004 //FIXME H.264-specific
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#define MB_TYPE_16x16 0x0008
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#define MB_TYPE_16x8 0x0010
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#define MB_TYPE_8x16 0x0020
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#define MB_TYPE_8x8 0x0040
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#define MB_TYPE_INTERLACED 0x0080
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#define MB_TYPE_DIRECT2 0x0100 //FIXME
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#define MB_TYPE_ACPRED 0x0200
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#define MB_TYPE_GMC 0x0400
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#define MB_TYPE_SKIP 0x0800
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#define MB_TYPE_P0L0 0x1000
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#define MB_TYPE_P1L0 0x2000
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#define MB_TYPE_P0L1 0x4000
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#define MB_TYPE_P1L1 0x8000
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#define MB_TYPE_L0 (MB_TYPE_P0L0 | MB_TYPE_P1L0)
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#define MB_TYPE_L1 (MB_TYPE_P0L1 | MB_TYPE_P1L1)
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#define MB_TYPE_L0L1 (MB_TYPE_L0 | MB_TYPE_L1)
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#define MB_TYPE_QUANT 0x00010000
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#define MB_TYPE_CBP 0x00020000
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//Note bits 24-31 are reserved for codec specific use (h264 ref0, mpeg1 0mv, ...)
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* This specifies the area which should be displayed.
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* Note there may be multiple such areas for one frame.
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typedef struct AVPanScan{
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* - encoding: Set by user.
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* - decoding: Set by libavcodec.
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* width and height in 1/16 pel
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* - encoding: Set by user.
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* - decoding: Set by libavcodec.
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* position of the top left corner in 1/16 pel for up to 3 fields/frames
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* - encoding: Set by user.
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* - decoding: Set by libavcodec.
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int16_t position[3][2];
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#define FF_COMMON_FRAME \
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* pointer to the picture planes.\
743
* This might be different from the first allocated byte\
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* pointer to the first allocated byte of the picture. Can be used in get_buffer/release_buffer.\
751
* This isn't used by libavcodec unless the default get/release_buffer() is used.\
757
* 1 -> keyframe, 0-> not\
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* - encoding: Set by libavcodec.\
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* - decoding: Set by libavcodec.\
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* Picture type of the frame, see ?_TYPE below.\
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* - encoding: Set by libavcodec. for coded_picture (and set by user for input).\
766
* - decoding: Set by libavcodec.\
768
enum AVPictureType pict_type;\
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* presentation timestamp in time_base units (time when frame should be shown to user)\
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* If AV_NOPTS_VALUE then frame_rate = 1/time_base will be assumed.\
773
* - encoding: MUST be set by user.\
774
* - decoding: Set by libavcodec.\
779
* picture number in bitstream order\
780
* - encoding: set by\
781
* - decoding: Set by libavcodec.\
783
int coded_picture_number;\
785
* picture number in display order\
786
* - encoding: set by\
787
* - decoding: Set by libavcodec.\
789
int display_picture_number;\
792
* quality (between 1 (good) and FF_LAMBDA_MAX (bad)) \
793
* - encoding: Set by libavcodec. for coded_picture (and set by user for input).\
794
* - decoding: Set by libavcodec.\
799
* buffer age (1->was last buffer and dint change, 2->..., ...).\
800
* Set to INT_MAX if the buffer has not been used yet.\
801
* - encoding: unused\
802
* - decoding: MUST be set by get_buffer().\
807
* is this picture used as reference\
808
* The values for this are the same as the MpegEncContext.picture_structure\
809
* variable, that is 1->top field, 2->bottom field, 3->frame/both fields.\
810
* Set to 4 for delayed, non-reference frames.\
811
* - encoding: unused\
812
* - decoding: Set by libavcodec. (before get_buffer() call)).\
818
* - encoding: unused\
819
* - decoding: Set by libavcodec.\
821
int8_t *qscale_table;\
824
* - encoding: unused\
825
* - decoding: Set by libavcodec.\
830
* mbskip_table[mb]>=1 if MB didn't change\
831
* stride= mb_width = (width+15)>>4\
832
* - encoding: unused\
833
* - decoding: Set by libavcodec.\
835
uint8_t *mbskip_table;\
838
* motion vector table\
841
* int mv_sample_log2= 4 - motion_subsample_log2;\
842
* int mb_width= (width+15)>>4;\
843
* int mv_stride= (mb_width << mv_sample_log2) + 1;\
844
* motion_val[direction][x + y*mv_stride][0->mv_x, 1->mv_y];\
846
* - encoding: Set by user.\
847
* - decoding: Set by libavcodec.\
849
int16_t (*motion_val[2])[2];\
852
* macroblock type table\
853
* mb_type_base + mb_width + 2\
854
* - encoding: Set by user.\
855
* - decoding: Set by libavcodec.\
860
* log2 of the size of the block which a single vector in motion_val represents: \
861
* (4->16x16, 3->8x8, 2-> 4x4, 1-> 2x2)\
862
* - encoding: unused\
863
* - decoding: Set by libavcodec.\
865
uint8_t motion_subsample_log2;\
868
* for some private data of the user\
869
* - encoding: unused\
870
* - decoding: Set by user.\
876
* - encoding: Set by libavcodec. if flags&CODEC_FLAG_PSNR.\
877
* - decoding: unused\
882
* type of the buffer (to keep track of who has to deallocate data[*])\
883
* - encoding: Set by the one who allocates it.\
884
* - decoding: Set by the one who allocates it.\
885
* Note: User allocated (direct rendering) & internal buffers cannot coexist currently.\
890
* When decoding, this signals how much the picture must be delayed.\
891
* extra_delay = repeat_pict / (2*fps)\
892
* - encoding: unused\
893
* - decoding: Set by libavcodec.\
903
* The content of the picture is interlaced.\
904
* - encoding: Set by user.\
905
* - decoding: Set by libavcodec. (default 0)\
907
int interlaced_frame;\
910
* If the content is interlaced, is top field displayed first.\
911
* - encoding: Set by user.\
912
* - decoding: Set by libavcodec.\
914
int top_field_first;\
918
* - encoding: Set by user.\
919
* - decoding: Set by libavcodec.\
921
AVPanScan *pan_scan;\
924
* Tell user application that palette has changed from previous frame.\
925
* - encoding: ??? (no palette-enabled encoder yet)\
926
* - decoding: Set by libavcodec. (default 0).\
928
int palette_has_changed;\
931
* codec suggestion on buffer type if != 0\
932
* - encoding: unused\
933
* - decoding: Set by libavcodec. (before get_buffer() call)).\
939
* - encoding: unused\
940
* - decoding: Set by libavcodec.\
945
* motion reference frame index\
946
* the order in which these are stored can depend on the codec.\
947
* - encoding: Set by user.\
948
* - decoding: Set by libavcodec.\
950
int8_t *ref_index[2];\
953
* reordered opaque 64bit (generally an integer or a double precision float\
954
* PTS but can be anything). \
955
* The user sets AVCodecContext.reordered_opaque to represent the input at\
957
* the decoder reorders values as needed and sets AVFrame.reordered_opaque\
958
* to exactly one of the values provided by the user through AVCodecContext.reordered_opaque \
959
* @deprecated in favor of pkt_pts\
960
* - encoding: unused\
961
* - decoding: Read by user.\
963
int64_t reordered_opaque;\
966
* hardware accelerator private data (Libav-allocated)\
967
* - encoding: unused\
968
* - decoding: Set by libavcodec\
970
void *hwaccel_picture_private;\
973
* reordered pts from the last AVPacket that has been input into the decoder\
974
* - encoding: unused\
975
* - decoding: Read by user.\
980
* dts from the last AVPacket that has been input into the decoder\
981
* - encoding: unused\
982
* - decoding: Read by user.\
987
* the AVCodecContext which ff_thread_get_buffer() was last called on\
988
* - encoding: Set by libavcodec.\
989
* - decoding: Set by libavcodec.\
991
struct AVCodecContext *owner;\
994
* used by multithreading to store frame-specific info\
995
* - encoding: Set by libavcodec.\
996
* - decoding: Set by libavcodec.\
998
void *thread_opaque;\
1000
#define FF_QSCALE_TYPE_MPEG1 0
1001
#define FF_QSCALE_TYPE_MPEG2 1
1002
#define FF_QSCALE_TYPE_H264 2
1003
#define FF_QSCALE_TYPE_VP56 3
1005
#define FF_BUFFER_TYPE_INTERNAL 1
1006
#define FF_BUFFER_TYPE_USER 2 ///< direct rendering buffers (image is (de)allocated by user)
1007
#define FF_BUFFER_TYPE_SHARED 4 ///< Buffer from somewhere else; don't deallocate image (data/base), all other tables are not shared.
1008
#define FF_BUFFER_TYPE_COPY 8 ///< Just a (modified) copy of some other buffer, don't deallocate anything.
1010
#if FF_API_OLD_FF_PICT_TYPES
1011
/* DEPRECATED, directly use the AV_PICTURE_TYPE_* enum values */
1012
#define FF_I_TYPE AV_PICTURE_TYPE_I ///< Intra
1013
#define FF_P_TYPE AV_PICTURE_TYPE_P ///< Predicted
1014
#define FF_B_TYPE AV_PICTURE_TYPE_B ///< Bi-dir predicted
1015
#define FF_S_TYPE AV_PICTURE_TYPE_S ///< S(GMC)-VOP MPEG4
1016
#define FF_SI_TYPE AV_PICTURE_TYPE_SI ///< Switching Intra
1017
#define FF_SP_TYPE AV_PICTURE_TYPE_SP ///< Switching Predicted
1018
#define FF_BI_TYPE AV_PICTURE_TYPE_BI
1021
#define FF_BUFFER_HINTS_VALID 0x01 // Buffer hints value is meaningful (if 0 ignore).
1022
#define FF_BUFFER_HINTS_READABLE 0x02 // Codec will read from buffer.
1023
#define FF_BUFFER_HINTS_PRESERVE 0x04 // User must not alter buffer content.
1024
#define FF_BUFFER_HINTS_REUSABLE 0x08 // Codec will reuse the buffer (update).
1026
enum AVPacketSideDataType {
1027
AV_PKT_DATA_PALETTE,
1030
typedef struct AVPacket {
1032
* Presentation timestamp in AVStream->time_base units; the time at which
1033
* the decompressed packet will be presented to the user.
1034
* Can be AV_NOPTS_VALUE if it is not stored in the file.
1035
* pts MUST be larger or equal to dts as presentation cannot happen before
1036
* decompression, unless one wants to view hex dumps. Some formats misuse
1037
* the terms dts and pts/cts to mean something different. Such timestamps
1038
* must be converted to true pts/dts before they are stored in AVPacket.
1042
* Decompression timestamp in AVStream->time_base units; the time at which
1043
* the packet is decompressed.
1044
* Can be AV_NOPTS_VALUE if it is not stored in the file.
1052
* Additional packet data that can be provided by the container.
1053
* Packet can contain several types of side information.
1058
enum AVPacketSideDataType type;
1060
int side_data_elems;
1063
* Duration of this packet in AVStream->time_base units, 0 if unknown.
1064
* Equals next_pts - this_pts in presentation order.
1067
void (*destruct)(struct AVPacket *);
1069
int64_t pos; ///< byte position in stream, -1 if unknown
1072
* Time difference in AVStream->time_base units from the pts of this
1073
* packet to the point at which the output from the decoder has converged
1074
* independent from the availability of previous frames. That is, the
1075
* frames are virtually identical no matter if decoding started from
1076
* the very first frame or from this keyframe.
1077
* Is AV_NOPTS_VALUE if unknown.
1078
* This field is not the display duration of the current packet.
1079
* This field has no meaning if the packet does not have AV_PKT_FLAG_KEY
1082
* The purpose of this field is to allow seeking in streams that have no
1083
* keyframes in the conventional sense. It corresponds to the
1084
* recovery point SEI in H.264 and match_time_delta in NUT. It is also
1085
* essential for some types of subtitle streams to ensure that all
1086
* subtitles are correctly displayed after seeking.
1088
int64_t convergence_duration;
1090
#define AV_PKT_FLAG_KEY 0x0001
1093
* Audio Video Frame.
1094
* New fields can be added to the end of FF_COMMON_FRAME with minor version
1096
* Removal, reordering and changes to existing fields require a major
1097
* version bump. No fields should be added into AVFrame before or after
1099
* sizeof(AVFrame) must not be used outside libav*.
1101
typedef struct AVFrame {
1106
* main external API structure.
1107
* New fields can be added to the end with minor version bumps.
1108
* Removal, reordering and changes to existing fields require a major
1110
* sizeof(AVCodecContext) must not be used outside libav*.
1112
typedef struct AVCodecContext {
1114
* information on struct for av_log
1115
* - set by avcodec_alloc_context
1117
const AVClass *av_class;
1119
* the average bitrate
1120
* - encoding: Set by user; unused for constant quantizer encoding.
1121
* - decoding: Set by libavcodec. 0 or some bitrate if this info is available in the stream.
1126
* number of bits the bitstream is allowed to diverge from the reference.
1127
* the reference can be CBR (for CBR pass1) or VBR (for pass2)
1128
* - encoding: Set by user; unused for constant quantizer encoding.
1129
* - decoding: unused
1131
int bit_rate_tolerance;
1135
* - encoding: Set by user.
1136
* - decoding: Set by user.
1141
* Some codecs need additional format info. It is stored here.
1142
* If any muxer uses this then ALL demuxers/parsers AND encoders for the
1143
* specific codec MUST set it correctly otherwise stream copy breaks.
1144
* In general use of this field by muxers is not recommanded.
1145
* - encoding: Set by libavcodec.
1146
* - decoding: Set by libavcodec. (FIXME: Is this OK?)
1151
* Motion estimation algorithm used for video coding.
1152
* 1 (zero), 2 (full), 3 (log), 4 (phods), 5 (epzs), 6 (x1), 7 (hex),
1153
* 8 (umh), 9 (iter), 10 (tesa) [7, 8, 10 are x264 specific, 9 is snow specific]
1154
* - encoding: MUST be set by user.
1155
* - decoding: unused
1160
* some codecs need / can use extradata like Huffman tables.
1161
* mjpeg: Huffman tables
1162
* rv10: additional flags
1163
* mpeg4: global headers (they can be in the bitstream or here)
1164
* The allocated memory should be FF_INPUT_BUFFER_PADDING_SIZE bytes larger
1165
* than extradata_size to avoid prolems if it is read with the bitstream reader.
1166
* The bytewise contents of extradata must not depend on the architecture or CPU endianness.
1167
* - encoding: Set/allocated/freed by libavcodec.
1168
* - decoding: Set/allocated/freed by user.
1174
* This is the fundamental unit of time (in seconds) in terms
1175
* of which frame timestamps are represented. For fixed-fps content,
1176
* timebase should be 1/framerate and timestamp increments should be
1178
* - encoding: MUST be set by user.
1179
* - decoding: Set by libavcodec.
1181
AVRational time_base;
1185
* picture width / height.
1186
* - encoding: MUST be set by user.
1187
* - decoding: Set by libavcodec.
1188
* Note: For compatibility it is possible to set this instead of
1189
* coded_width/height before decoding.
1193
#define FF_ASPECT_EXTENDED 15
1196
* the number of pictures in a group of pictures, or 0 for intra_only
1197
* - encoding: Set by user.
1198
* - decoding: unused
1203
* Pixel format, see PIX_FMT_xxx.
1204
* May be set by the demuxer if known from headers.
1205
* May be overriden by the decoder if it knows better.
1206
* - encoding: Set by user.
1207
* - decoding: Set by user if known, overridden by libavcodec if known
1209
enum PixelFormat pix_fmt;
1212
* If non NULL, 'draw_horiz_band' is called by the libavcodec
1213
* decoder to draw a horizontal band. It improves cache usage. Not
1214
* all codecs can do that. You must check the codec capabilities
1216
* When multithreading is used, it may be called from multiple threads
1217
* at the same time; threads might draw different parts of the same AVFrame,
1218
* or multiple AVFrames, and there is no guarantee that slices will be drawn
1220
* The function is also used by hardware acceleration APIs.
1221
* It is called at least once during frame decoding to pass
1222
* the data needed for hardware render.
1223
* In that mode instead of pixel data, AVFrame points to
1224
* a structure specific to the acceleration API. The application
1225
* reads the structure and can change some fields to indicate progress
1227
* - encoding: unused
1228
* - decoding: Set by user.
1229
* @param height the height of the slice
1230
* @param y the y position of the slice
1231
* @param type 1->top field, 2->bottom field, 3->frame
1232
* @param offset offset into the AVFrame.data from which the slice should be read
1234
void (*draw_horiz_band)(struct AVCodecContext *s,
1235
const AVFrame *src, int offset[4],
1236
int y, int type, int height);
1239
int sample_rate; ///< samples per second
1240
int channels; ///< number of audio channels
1243
* audio sample format
1244
* - encoding: Set by user.
1245
* - decoding: Set by libavcodec.
1247
enum AVSampleFormat sample_fmt; ///< sample format
1249
/* The following data should not be initialized. */
1251
* Samples per packet, initialized when calling 'init'.
1254
int frame_number; ///< audio or video frame number
1257
* Number of frames the decoded output will be delayed relative to
1258
* the encoded input.
1259
* - encoding: Set by libavcodec.
1260
* - decoding: unused
1264
/* - encoding parameters */
1265
float qcompress; ///< amount of qscale change between easy & hard scenes (0.0-1.0)
1266
float qblur; ///< amount of qscale smoothing over time (0.0-1.0)
1270
* - encoding: Set by user.
1271
* - decoding: unused
1277
* - encoding: Set by user.
1278
* - decoding: unused
1283
* maximum quantizer difference between frames
1284
* - encoding: Set by user.
1285
* - decoding: unused
1290
* maximum number of B-frames between non-B-frames
1291
* Note: The output will be delayed by max_b_frames+1 relative to the input.
1292
* - encoding: Set by user.
1293
* - decoding: unused
1298
* qscale factor between IP and B-frames
1299
* If > 0 then the last P-frame quantizer will be used (q= lastp_q*factor+offset).
1300
* If < 0 then normal ratecontrol will be done (q= -normal_q*factor+offset).
1301
* - encoding: Set by user.
1302
* - decoding: unused
1304
float b_quant_factor;
1306
/** obsolete FIXME remove */
1308
#define FF_RC_STRATEGY_XVID 1
1310
int b_frame_strategy;
1312
struct AVCodec *codec;
1316
int rtp_payload_size; /* The size of the RTP payload: the coder will */
1317
/* do its best to deliver a chunk with size */
1318
/* below rtp_payload_size, the chunk will start */
1319
/* with a start code on some codecs like H.263. */
1320
/* This doesn't take account of any particular */
1321
/* headers inside the transmitted RTP payload. */
1324
/* The RTP callback: This function is called */
1325
/* every time the encoder has a packet to send. */
1326
/* It depends on the encoder if the data starts */
1327
/* with a Start Code (it should). H.263 does. */
1328
/* mb_nb contains the number of macroblocks */
1329
/* encoded in the RTP payload. */
1330
void (*rtp_callback)(struct AVCodecContext *avctx, void *data, int size, int mb_nb);
1332
/* statistics, used for 2-pass encoding */
1343
* number of bits used for the previously encoded frame
1344
* - encoding: Set by libavcodec.
1345
* - decoding: unused
1350
* Private data of the user, can be used to carry app specific stuff.
1351
* - encoding: Set by user.
1352
* - decoding: Set by user.
1356
char codec_name[32];
1357
enum AVMediaType codec_type; /* see AVMEDIA_TYPE_xxx */
1358
enum CodecID codec_id; /* see CODEC_ID_xxx */
1361
* fourcc (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A').
1362
* This is used to work around some encoder bugs.
1363
* A demuxer should set this to what is stored in the field used to identify the codec.
1364
* If there are multiple such fields in a container then the demuxer should choose the one
1365
* which maximizes the information about the used codec.
1366
* If the codec tag field in a container is larger then 32 bits then the demuxer should
1367
* remap the longer ID to 32 bits with a table or other structure. Alternatively a new
1368
* extra_codec_tag + size could be added but for this a clear advantage must be demonstrated
1370
* - encoding: Set by user, if not then the default based on codec_id will be used.
1371
* - decoding: Set by user, will be converted to uppercase by libavcodec during init.
1373
unsigned int codec_tag;
1376
* Work around bugs in encoders which sometimes cannot be detected automatically.
1377
* - encoding: Set by user
1378
* - decoding: Set by user
1380
int workaround_bugs;
1381
#define FF_BUG_AUTODETECT 1 ///< autodetection
1382
#define FF_BUG_OLD_MSMPEG4 2
1383
#define FF_BUG_XVID_ILACE 4
1384
#define FF_BUG_UMP4 8
1385
#define FF_BUG_NO_PADDING 16
1386
#define FF_BUG_AMV 32
1387
#define FF_BUG_AC_VLC 0 ///< Will be removed, libavcodec can now handle these non-compliant files by default.
1388
#define FF_BUG_QPEL_CHROMA 64
1389
#define FF_BUG_STD_QPEL 128
1390
#define FF_BUG_QPEL_CHROMA2 256
1391
#define FF_BUG_DIRECT_BLOCKSIZE 512
1392
#define FF_BUG_EDGE 1024
1393
#define FF_BUG_HPEL_CHROMA 2048
1394
#define FF_BUG_DC_CLIP 4096
1395
#define FF_BUG_MS 8192 ///< Work around various bugs in Microsoft's broken decoders.
1396
#define FF_BUG_TRUNCATED 16384
1397
//#define FF_BUG_FAKE_SCALABILITY 16 //Autodetection should work 100%.
1400
* luma single coefficient elimination threshold
1401
* - encoding: Set by user.
1402
* - decoding: unused
1404
int luma_elim_threshold;
1407
* chroma single coeff elimination threshold
1408
* - encoding: Set by user.
1409
* - decoding: unused
1411
int chroma_elim_threshold;
1414
* strictly follow the standard (MPEG4, ...).
1415
* - encoding: Set by user.
1416
* - decoding: Set by user.
1417
* Setting this to STRICT or higher means the encoder and decoder will
1418
* generally do stupid things, whereas setting it to unofficial or lower
1419
* will mean the encoder might produce output that is not supported by all
1420
* spec-compliant decoders. Decoders don't differentiate between normal,
1421
* unofficial and experimental (that is, they always try to decode things
1422
* when they can) unless they are explicitly asked to behave stupidly
1423
* (=strictly conform to the specs)
1425
int strict_std_compliance;
1426
#define FF_COMPLIANCE_VERY_STRICT 2 ///< Strictly conform to an older more strict version of the spec or reference software.
1427
#define FF_COMPLIANCE_STRICT 1 ///< Strictly conform to all the things in the spec no matter what consequences.
1428
#define FF_COMPLIANCE_NORMAL 0
1429
#define FF_COMPLIANCE_UNOFFICIAL -1 ///< Allow unofficial extensions
1430
#define FF_COMPLIANCE_EXPERIMENTAL -2 ///< Allow nonstandardized experimental things.
1433
* qscale offset between IP and B-frames
1434
* - encoding: Set by user.
1435
* - decoding: unused
1437
float b_quant_offset;
1440
* Error recognization; higher values will detect more errors but may
1441
* misdetect some more or less valid parts as errors.
1442
* - encoding: unused
1443
* - decoding: Set by user.
1445
int error_recognition;
1446
#define FF_ER_CAREFUL 1
1447
#define FF_ER_COMPLIANT 2
1448
#define FF_ER_AGGRESSIVE 3
1449
#define FF_ER_VERY_AGGRESSIVE 4
1452
* Called at the beginning of each frame to get a buffer for it.
1453
* If pic.reference is set then the frame will be read later by libavcodec.
1454
* avcodec_align_dimensions2() should be used to find the required width and
1455
* height, as they normally need to be rounded up to the next multiple of 16.
1456
* if CODEC_CAP_DR1 is not set then get_buffer() must call
1457
* avcodec_default_get_buffer() instead of providing buffers allocated by
1459
* If frame multithreading is used and thread_safe_callbacks is set,
1460
* it may be called from a different thread, but not from more than one at once.
1461
* Does not need to be reentrant.
1462
* - encoding: unused
1463
* - decoding: Set by libavcodec, user can override.
1465
int (*get_buffer)(struct AVCodecContext *c, AVFrame *pic);
1468
* Called to release buffers which were allocated with get_buffer.
1469
* A released buffer can be reused in get_buffer().
1470
* pic.data[*] must be set to NULL.
1471
* May be called from a different thread if frame multithreading is used,
1472
* but not by more than one thread at once, so does not need to be reentrant.
1473
* - encoding: unused
1474
* - decoding: Set by libavcodec, user can override.
1476
void (*release_buffer)(struct AVCodecContext *c, AVFrame *pic);
1479
* Size of the frame reordering buffer in the decoder.
1480
* For MPEG-2 it is 1 IPB or 0 low delay IP.
1481
* - encoding: Set by libavcodec.
1482
* - decoding: Set by libavcodec.
1487
* number of bytes per packet if constant and known or 0
1488
* Used by some WAV based audio codecs.
1492
int parse_only; /* - decoding only: If true, only parsing is done
1493
(function avcodec_parse_frame()). The frame
1494
data is returned. Only MPEG codecs support this now. */
1497
* 0-> h263 quant 1-> mpeg quant
1498
* - encoding: Set by user.
1499
* - decoding: unused
1504
* pass1 encoding statistics output buffer
1505
* - encoding: Set by libavcodec.
1506
* - decoding: unused
1511
* pass2 encoding statistics input buffer
1512
* Concatenated stuff from stats_out of pass1 should be placed here.
1513
* - encoding: Allocated/set/freed by user.
1514
* - decoding: unused
1519
* ratecontrol qmin qmax limiting method
1520
* 0-> clipping, 1-> use a nice continous function to limit qscale wthin qmin/qmax.
1521
* - encoding: Set by user.
1522
* - decoding: unused
1530
* ratecontrol override, see RcOverride
1531
* - encoding: Allocated/set/freed by user.
1532
* - decoding: unused
1534
RcOverride *rc_override;
1535
int rc_override_count;
1538
* rate control equation
1539
* - encoding: Set by user
1540
* - decoding: unused
1546
* - encoding: Set by user.
1547
* - decoding: unused
1553
* - encoding: Set by user.
1554
* - decoding: unused
1559
* decoder bitstream buffer size
1560
* - encoding: Set by user.
1561
* - decoding: unused
1564
float rc_buffer_aggressivity;
1567
* qscale factor between P and I-frames
1568
* If > 0 then the last p frame quantizer will be used (q= lastp_q*factor+offset).
1569
* If < 0 then normal ratecontrol will be done (q= -normal_q*factor+offset).
1570
* - encoding: Set by user.
1571
* - decoding: unused
1573
float i_quant_factor;
1576
* qscale offset between P and I-frames
1577
* - encoding: Set by user.
1578
* - decoding: unused
1580
float i_quant_offset;
1583
* initial complexity for pass1 ratecontrol
1584
* - encoding: Set by user.
1585
* - decoding: unused
1587
float rc_initial_cplx;
1590
* DCT algorithm, see FF_DCT_* below
1591
* - encoding: Set by user.
1592
* - decoding: unused
1595
#define FF_DCT_AUTO 0
1596
#define FF_DCT_FASTINT 1
1597
#define FF_DCT_INT 2
1598
#define FF_DCT_MMX 3
1599
#define FF_DCT_MLIB 4
1600
#define FF_DCT_ALTIVEC 5
1601
#define FF_DCT_FAAN 6
1604
* luminance masking (0-> disabled)
1605
* - encoding: Set by user.
1606
* - decoding: unused
1611
* temporary complexity masking (0-> disabled)
1612
* - encoding: Set by user.
1613
* - decoding: unused
1615
float temporal_cplx_masking;
1618
* spatial complexity masking (0-> disabled)
1619
* - encoding: Set by user.
1620
* - decoding: unused
1622
float spatial_cplx_masking;
1625
* p block masking (0-> disabled)
1626
* - encoding: Set by user.
1627
* - decoding: unused
1632
* darkness masking (0-> disabled)
1633
* - encoding: Set by user.
1634
* - decoding: unused
1639
* IDCT algorithm, see FF_IDCT_* below.
1640
* - encoding: Set by user.
1641
* - decoding: Set by user.
1644
#define FF_IDCT_AUTO 0
1645
#define FF_IDCT_INT 1
1646
#define FF_IDCT_SIMPLE 2
1647
#define FF_IDCT_SIMPLEMMX 3
1648
#define FF_IDCT_LIBMPEG2MMX 4
1649
#define FF_IDCT_PS2 5
1650
#define FF_IDCT_MLIB 6
1651
#define FF_IDCT_ARM 7
1652
#define FF_IDCT_ALTIVEC 8
1653
#define FF_IDCT_SH4 9
1654
#define FF_IDCT_SIMPLEARM 10
1655
#define FF_IDCT_H264 11
1656
#define FF_IDCT_VP3 12
1657
#define FF_IDCT_IPP 13
1658
#define FF_IDCT_XVIDMMX 14
1659
#define FF_IDCT_CAVS 15
1660
#define FF_IDCT_SIMPLEARMV5TE 16
1661
#define FF_IDCT_SIMPLEARMV6 17
1662
#define FF_IDCT_SIMPLEVIS 18
1663
#define FF_IDCT_WMV2 19
1664
#define FF_IDCT_FAAN 20
1665
#define FF_IDCT_EA 21
1666
#define FF_IDCT_SIMPLENEON 22
1667
#define FF_IDCT_SIMPLEALPHA 23
1668
#define FF_IDCT_BINK 24
1672
* - encoding: Set by libavcodec.
1673
* - decoding: Set by user (or 0).
1677
* slice offsets in the frame in bytes
1678
* - encoding: Set/allocated by libavcodec.
1679
* - decoding: Set/allocated by user (or NULL).
1684
* error concealment flags
1685
* - encoding: unused
1686
* - decoding: Set by user.
1688
int error_concealment;
1689
#define FF_EC_GUESS_MVS 1
1690
#define FF_EC_DEBLOCK 2
1693
* dsp_mask could be add used to disable unwanted CPU features
1694
* CPU features (i.e. MMX, SSE. ...)
1696
* With the FORCE flag you may instead enable given CPU features.
1697
* (Dangerous: Usable in case of misdetection, improper usage however will
1698
* result into program crash.)
1703
* bits per sample/pixel from the demuxer (needed for huffyuv).
1704
* - encoding: Set by libavcodec.
1705
* - decoding: Set by user.
1707
int bits_per_coded_sample;
1710
* prediction method (needed for huffyuv)
1711
* - encoding: Set by user.
1712
* - decoding: unused
1714
int prediction_method;
1715
#define FF_PRED_LEFT 0
1716
#define FF_PRED_PLANE 1
1717
#define FF_PRED_MEDIAN 2
1720
* sample aspect ratio (0 if unknown)
1721
* That is the width of a pixel divided by the height of the pixel.
1722
* Numerator and denominator must be relatively prime and smaller than 256 for some video standards.
1723
* - encoding: Set by user.
1724
* - decoding: Set by libavcodec.
1726
AVRational sample_aspect_ratio;
1729
* the picture in the bitstream
1730
* - encoding: Set by libavcodec.
1731
* - decoding: Set by libavcodec.
1733
AVFrame *coded_frame;
1737
* - encoding: Set by user.
1738
* - decoding: Set by user.
1741
#define FF_DEBUG_PICT_INFO 1
1742
#define FF_DEBUG_RC 2
1743
#define FF_DEBUG_BITSTREAM 4
1744
#define FF_DEBUG_MB_TYPE 8
1745
#define FF_DEBUG_QP 16
1746
#define FF_DEBUG_MV 32
1747
#define FF_DEBUG_DCT_COEFF 0x00000040
1748
#define FF_DEBUG_SKIP 0x00000080
1749
#define FF_DEBUG_STARTCODE 0x00000100
1750
#define FF_DEBUG_PTS 0x00000200
1751
#define FF_DEBUG_ER 0x00000400
1752
#define FF_DEBUG_MMCO 0x00000800
1753
#define FF_DEBUG_BUGS 0x00001000
1754
#define FF_DEBUG_VIS_QP 0x00002000
1755
#define FF_DEBUG_VIS_MB_TYPE 0x00004000
1756
#define FF_DEBUG_BUFFERS 0x00008000
1757
#define FF_DEBUG_THREADS 0x00010000
1761
* - encoding: Set by user.
1762
* - decoding: Set by user.
1765
#define FF_DEBUG_VIS_MV_P_FOR 0x00000001 //visualize forward predicted MVs of P frames
1766
#define FF_DEBUG_VIS_MV_B_FOR 0x00000002 //visualize forward predicted MVs of B frames
1767
#define FF_DEBUG_VIS_MV_B_BACK 0x00000004 //visualize backward predicted MVs of B frames
1771
* - encoding: Set by libavcodec if flags&CODEC_FLAG_PSNR.
1772
* - decoding: unused
1777
* motion estimation comparison function
1778
* - encoding: Set by user.
1779
* - decoding: unused
1783
* subpixel motion estimation comparison function
1784
* - encoding: Set by user.
1785
* - decoding: unused
1789
* macroblock comparison function (not supported yet)
1790
* - encoding: Set by user.
1791
* - decoding: unused
1795
* interlaced DCT comparison function
1796
* - encoding: Set by user.
1797
* - decoding: unused
1800
#define FF_CMP_SAD 0
1801
#define FF_CMP_SSE 1
1802
#define FF_CMP_SATD 2
1803
#define FF_CMP_DCT 3
1804
#define FF_CMP_PSNR 4
1805
#define FF_CMP_BIT 5
1807
#define FF_CMP_ZERO 7
1808
#define FF_CMP_VSAD 8
1809
#define FF_CMP_VSSE 9
1810
#define FF_CMP_NSSE 10
1811
#define FF_CMP_W53 11
1812
#define FF_CMP_W97 12
1813
#define FF_CMP_DCTMAX 13
1814
#define FF_CMP_DCT264 14
1815
#define FF_CMP_CHROMA 256
1818
* ME diamond size & shape
1819
* - encoding: Set by user.
1820
* - decoding: unused
1825
* amount of previous MV predictors (2a+1 x 2a+1 square)
1826
* - encoding: Set by user.
1827
* - decoding: unused
1829
int last_predictor_count;
1832
* prepass for motion estimation
1833
* - encoding: Set by user.
1834
* - decoding: unused
1839
* motion estimation prepass comparison function
1840
* - encoding: Set by user.
1841
* - decoding: unused
1846
* ME prepass diamond size & shape
1847
* - encoding: Set by user.
1848
* - decoding: unused
1854
* - encoding: Set by user.
1855
* - decoding: unused
1857
int me_subpel_quality;
1860
* callback to negotiate the pixelFormat
1861
* @param fmt is the list of formats which are supported by the codec,
1862
* it is terminated by -1 as 0 is a valid format, the formats are ordered by quality.
1863
* The first is always the native one.
1864
* @return the chosen format
1865
* - encoding: unused
1866
* - decoding: Set by user, if not set the native format will be chosen.
1868
enum PixelFormat (*get_format)(struct AVCodecContext *s, const enum PixelFormat * fmt);
1871
* DTG active format information (additional aspect ratio
1872
* information only used in DVB MPEG-2 transport streams)
1875
* - encoding: unused
1876
* - decoding: Set by decoder.
1878
int dtg_active_format;
1879
#define FF_DTG_AFD_SAME 8
1880
#define FF_DTG_AFD_4_3 9
1881
#define FF_DTG_AFD_16_9 10
1882
#define FF_DTG_AFD_14_9 11
1883
#define FF_DTG_AFD_4_3_SP_14_9 13
1884
#define FF_DTG_AFD_16_9_SP_14_9 14
1885
#define FF_DTG_AFD_SP_4_3 15
1888
* maximum motion estimation search range in subpel units
1889
* If 0 then no limit.
1891
* - encoding: Set by user.
1892
* - decoding: unused
1897
* intra quantizer bias
1898
* - encoding: Set by user.
1899
* - decoding: unused
1901
int intra_quant_bias;
1902
#define FF_DEFAULT_QUANT_BIAS 999999
1905
* inter quantizer bias
1906
* - encoding: Set by user.
1907
* - decoding: unused
1909
int inter_quant_bias;
1913
* - encoding: unused
1914
* - decoding: Which clrtable should be used for 8bit RGB images.
1915
* Tables have to be stored somewhere. FIXME
1920
* internal_buffer count
1921
* Don't touch, used by libavcodec default_get_buffer().
1923
int internal_buffer_count;
1927
* Don't touch, used by libavcodec default_get_buffer().
1929
void *internal_buffer;
1932
* Global quality for codecs which cannot change it per frame.
1933
* This should be proportional to MPEG-1/2/4 qscale.
1934
* - encoding: Set by user.
1935
* - decoding: unused
1939
#define FF_CODER_TYPE_VLC 0
1940
#define FF_CODER_TYPE_AC 1
1941
#define FF_CODER_TYPE_RAW 2
1942
#define FF_CODER_TYPE_RLE 3
1943
#define FF_CODER_TYPE_DEFLATE 4
1946
* - encoding: Set by user.
1947
* - decoding: unused
1953
* - encoding: Set by user.
1954
* - decoding: unused
1960
* - encoding: unused
1961
* - decoding: Set by user.
1963
uint8_t * (*realloc)(struct AVCodecContext *s, uint8_t *buf, int buf_size);
1968
* - encoding: unused
1969
* - decoding: Set by user.
1972
#define SLICE_FLAG_CODED_ORDER 0x0001 ///< draw_horiz_band() is called in coded order instead of display
1973
#define SLICE_FLAG_ALLOW_FIELD 0x0002 ///< allow draw_horiz_band() with field slices (MPEG2 field pics)
1974
#define SLICE_FLAG_ALLOW_PLANE 0x0004 ///< allow draw_horiz_band() with 1 component at a time (SVQ1)
1977
* XVideo Motion Acceleration
1978
* - encoding: forbidden
1979
* - decoding: set by decoder
1981
int xvmc_acceleration;
1984
* macroblock decision mode
1985
* - encoding: Set by user.
1986
* - decoding: unused
1989
#define FF_MB_DECISION_SIMPLE 0 ///< uses mb_cmp
1990
#define FF_MB_DECISION_BITS 1 ///< chooses the one which needs the fewest bits
1991
#define FF_MB_DECISION_RD 2 ///< rate distortion
1994
* custom intra quantization matrix
1995
* - encoding: Set by user, can be NULL.
1996
* - decoding: Set by libavcodec.
1998
uint16_t *intra_matrix;
2001
* custom inter quantization matrix
2002
* - encoding: Set by user, can be NULL.
2003
* - decoding: Set by libavcodec.
2005
uint16_t *inter_matrix;
2008
* fourcc from the AVI stream header (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A').
2009
* This is used to work around some encoder bugs.
2010
* - encoding: unused
2011
* - decoding: Set by user, will be converted to uppercase by libavcodec during init.
2013
unsigned int stream_codec_tag;
2016
* scene change detection threshold
2017
* 0 is default, larger means fewer detected scene changes.
2018
* - encoding: Set by user.
2019
* - decoding: unused
2021
int scenechange_threshold;
2024
* minimum Lagrange multipler
2025
* - encoding: Set by user.
2026
* - decoding: unused
2031
* maximum Lagrange multipler
2032
* - encoding: Set by user.
2033
* - decoding: unused
2037
#if FF_API_PALETTE_CONTROL
2039
* palette control structure
2040
* - encoding: ??? (no palette-enabled encoder yet)
2041
* - decoding: Set by user.
2043
struct AVPaletteControl *palctrl;
2047
* noise reduction strength
2048
* - encoding: Set by user.
2049
* - decoding: unused
2051
int noise_reduction;
2054
* Called at the beginning of a frame to get cr buffer for it.
2055
* Buffer type (size, hints) must be the same. libavcodec won't check it.
2056
* libavcodec will pass previous buffer in pic, function should return
2057
* same buffer or new buffer with old frame "painted" into it.
2058
* If pic.data[0] == NULL must behave like get_buffer().
2059
* if CODEC_CAP_DR1 is not set then reget_buffer() must call
2060
* avcodec_default_reget_buffer() instead of providing buffers allocated by
2062
* - encoding: unused
2063
* - decoding: Set by libavcodec, user can override.
2065
int (*reget_buffer)(struct AVCodecContext *c, AVFrame *pic);
2068
* Number of bits which should be loaded into the rc buffer before decoding starts.
2069
* - encoding: Set by user.
2070
* - decoding: unused
2072
int rc_initial_buffer_occupancy;
2076
* - encoding: Set by user.
2077
* - decoding: unused
2079
int inter_threshold;
2083
* - encoding: Set by user.
2084
* - decoding: Set by user.
2089
* Simulates errors in the bitstream to test error concealment.
2090
* - encoding: Set by user.
2091
* - decoding: unused
2095
#if FF_API_ANTIALIAS_ALGO
2097
* MP3 antialias algorithm, see FF_AA_* below.
2098
* - encoding: unused
2099
* - decoding: Set by user.
2101
attribute_deprecated int antialias_algo;
2102
#define FF_AA_AUTO 0
2103
#define FF_AA_FASTINT 1 //not implemented yet
2105
#define FF_AA_FLOAT 3
2109
* quantizer noise shaping
2110
* - encoding: Set by user.
2111
* - decoding: unused
2113
int quantizer_noise_shaping;
2117
* is used to decide how many independent tasks should be passed to execute()
2118
* - encoding: Set by user.
2119
* - decoding: Set by user.
2124
* The codec may call this to execute several independent things.
2125
* It will return only after finishing all tasks.
2126
* The user may replace this with some multithreaded implementation,
2127
* the default implementation will execute the parts serially.
2128
* @param count the number of things to execute
2129
* - encoding: Set by libavcodec, user can override.
2130
* - decoding: Set by libavcodec, user can override.
2132
int (*execute)(struct AVCodecContext *c, int (*func)(struct AVCodecContext *c2, void *arg), void *arg2, int *ret, int count, int size);
2136
* Can be used by execute() to store some per AVCodecContext stuff.
2137
* - encoding: set by execute()
2138
* - decoding: set by execute()
2140
void *thread_opaque;
2143
* Motion estimation threshold below which no motion estimation is
2144
* performed, but instead the user specified motion vectors are used.
2146
* - encoding: Set by user.
2147
* - decoding: unused
2152
* Macroblock threshold below which the user specified macroblock types will be used.
2153
* - encoding: Set by user.
2154
* - decoding: unused
2159
* precision of the intra DC coefficient - 8
2160
* - encoding: Set by user.
2161
* - decoding: unused
2163
int intra_dc_precision;
2166
* noise vs. sse weight for the nsse comparsion function
2167
* - encoding: Set by user.
2168
* - decoding: unused
2173
* Number of macroblock rows at the top which are skipped.
2174
* - encoding: unused
2175
* - decoding: Set by user.
2180
* Number of macroblock rows at the bottom which are skipped.
2181
* - encoding: unused
2182
* - decoding: Set by user.
2188
* - encoding: Set by user.
2189
* - decoding: Set by libavcodec.
2192
#define FF_PROFILE_UNKNOWN -99
2193
#define FF_PROFILE_RESERVED -100
2195
#define FF_PROFILE_AAC_MAIN 0
2196
#define FF_PROFILE_AAC_LOW 1
2197
#define FF_PROFILE_AAC_SSR 2
2198
#define FF_PROFILE_AAC_LTP 3
2200
#define FF_PROFILE_DTS 20
2201
#define FF_PROFILE_DTS_ES 30
2202
#define FF_PROFILE_DTS_96_24 40
2203
#define FF_PROFILE_DTS_HD_HRA 50
2204
#define FF_PROFILE_DTS_HD_MA 60
2206
#define FF_PROFILE_MPEG2_422 0
2207
#define FF_PROFILE_MPEG2_HIGH 1
2208
#define FF_PROFILE_MPEG2_SS 2
2209
#define FF_PROFILE_MPEG2_SNR_SCALABLE 3
2210
#define FF_PROFILE_MPEG2_MAIN 4
2211
#define FF_PROFILE_MPEG2_SIMPLE 5
2213
#define FF_PROFILE_H264_CONSTRAINED (1<<9) // 8+1; constraint_set1_flag
2214
#define FF_PROFILE_H264_INTRA (1<<11) // 8+3; constraint_set3_flag
2216
#define FF_PROFILE_H264_BASELINE 66
2217
#define FF_PROFILE_H264_CONSTRAINED_BASELINE (66|FF_PROFILE_H264_CONSTRAINED)
2218
#define FF_PROFILE_H264_MAIN 77
2219
#define FF_PROFILE_H264_EXTENDED 88
2220
#define FF_PROFILE_H264_HIGH 100
2221
#define FF_PROFILE_H264_HIGH_10 110
2222
#define FF_PROFILE_H264_HIGH_10_INTRA (110|FF_PROFILE_H264_INTRA)
2223
#define FF_PROFILE_H264_HIGH_422 122
2224
#define FF_PROFILE_H264_HIGH_422_INTRA (122|FF_PROFILE_H264_INTRA)
2225
#define FF_PROFILE_H264_HIGH_444 144
2226
#define FF_PROFILE_H264_HIGH_444_PREDICTIVE 244
2227
#define FF_PROFILE_H264_HIGH_444_INTRA (244|FF_PROFILE_H264_INTRA)
2228
#define FF_PROFILE_H264_CAVLC_444 44
2230
#define FF_PROFILE_VC1_SIMPLE 0
2231
#define FF_PROFILE_VC1_MAIN 1
2232
#define FF_PROFILE_VC1_COMPLEX 2
2233
#define FF_PROFILE_VC1_ADVANCED 3
2237
* - encoding: Set by user.
2238
* - decoding: Set by libavcodec.
2241
#define FF_LEVEL_UNKNOWN -99
2244
* low resolution decoding, 1-> 1/2 size, 2->1/4 size
2245
* - encoding: unused
2246
* - decoding: Set by user.
2251
* Bitstream width / height, may be different from width/height if lowres
2252
* or other things are used.
2253
* - encoding: unused
2254
* - decoding: Set by user before init if known. Codec should override / dynamically change if needed.
2256
int coded_width, coded_height;
2259
* frame skip threshold
2260
* - encoding: Set by user.
2261
* - decoding: unused
2263
int frame_skip_threshold;
2267
* - encoding: Set by user.
2268
* - decoding: unused
2270
int frame_skip_factor;
2273
* frame skip exponent
2274
* - encoding: Set by user.
2275
* - decoding: unused
2280
* frame skip comparison function
2281
* - encoding: Set by user.
2282
* - decoding: unused
2287
* Border processing masking, raises the quantizer for mbs on the borders
2289
* - encoding: Set by user.
2290
* - decoding: unused
2292
float border_masking;
2295
* minimum MB lagrange multipler
2296
* - encoding: Set by user.
2297
* - decoding: unused
2302
* maximum MB lagrange multipler
2303
* - encoding: Set by user.
2304
* - decoding: unused
2310
* - encoding: Set by user.
2311
* - decoding: unused
2313
int me_penalty_compensation;
2317
* - encoding: unused
2318
* - decoding: Set by user.
2320
enum AVDiscard skip_loop_filter;
2324
* - encoding: unused
2325
* - decoding: Set by user.
2327
enum AVDiscard skip_idct;
2331
* - encoding: unused
2332
* - decoding: Set by user.
2334
enum AVDiscard skip_frame;
2338
* - encoding: Set by user.
2339
* - decoding: unused
2345
* - encoding: Set by user.
2346
* - decoding: unused
2351
* constant rate factor - quality-based VBR - values ~correspond to qps
2352
* - encoding: Set by user.
2353
* - decoding: unused
2358
* constant quantization parameter rate control method
2359
* - encoding: Set by user.
2360
* - decoding: unused
2366
* - encoding: Set by user.
2367
* - decoding: unused
2372
* number of reference frames
2373
* - encoding: Set by user.
2374
* - decoding: Set by lavc.
2379
* chroma qp offset from luma
2380
* - encoding: Set by user.
2381
* - decoding: unused
2386
* Influences how often B-frames are used.
2387
* - encoding: Set by user.
2388
* - decoding: unused
2393
* trellis RD quantization
2394
* - encoding: Set by user.
2395
* - decoding: unused
2400
* Reduce fluctuations in qp (before curve compression).
2401
* - encoding: Set by user.
2402
* - decoding: unused
2404
float complexityblur;
2407
* in-loop deblocking filter alphac0 parameter
2408
* alpha is in the range -6...6
2409
* - encoding: Set by user.
2410
* - decoding: unused
2415
* in-loop deblocking filter beta parameter
2416
* beta is in the range -6...6
2417
* - encoding: Set by user.
2418
* - decoding: unused
2423
* macroblock subpartition sizes to consider - p8x8, p4x4, b8x8, i8x8, i4x4
2424
* - encoding: Set by user.
2425
* - decoding: unused
2428
#define X264_PART_I4X4 0x001 /* Analyze i4x4 */
2429
#define X264_PART_I8X8 0x002 /* Analyze i8x8 (requires 8x8 transform) */
2430
#define X264_PART_P8X8 0x010 /* Analyze p16x8, p8x16 and p8x8 */
2431
#define X264_PART_P4X4 0x020 /* Analyze p8x4, p4x8, p4x4 */
2432
#define X264_PART_B8X8 0x100 /* Analyze b16x8, b8x16 and b8x8 */
2435
* direct MV prediction mode - 0 (none), 1 (spatial), 2 (temporal), 3 (auto)
2436
* - encoding: Set by user.
2437
* - decoding: unused
2442
* Audio cutoff bandwidth (0 means "automatic")
2443
* - encoding: Set by user.
2444
* - decoding: unused
2449
* Multiplied by qscale for each frame and added to scene_change_score.
2450
* - encoding: Set by user.
2451
* - decoding: unused
2453
int scenechange_factor;
2457
* Note: Value depends upon the compare function used for fullpel ME.
2458
* - encoding: Set by user.
2459
* - decoding: unused
2464
* Adjusts sensitivity of b_frame_strategy 1.
2465
* - encoding: Set by user.
2466
* - decoding: unused
2471
* - encoding: Set by user.
2472
* - decoding: unused
2474
int compression_level;
2475
#define FF_COMPRESSION_DEFAULT -1
2478
* - encoding: Set by user.
2479
* - decoding: unused
2481
int min_prediction_order;
2484
* - encoding: Set by user.
2485
* - decoding: unused
2487
int max_prediction_order;
2489
#if FF_API_FLAC_GLOBAL_OPTS
2491
* @name FLAC options
2492
* @deprecated Use FLAC encoder private options instead.
2497
* LPC coefficient precision - used by FLAC encoder
2498
* - encoding: Set by user.
2499
* - decoding: unused
2501
attribute_deprecated int lpc_coeff_precision;
2504
* search method for selecting prediction order
2505
* - encoding: Set by user.
2506
* - decoding: unused
2508
attribute_deprecated int prediction_order_method;
2511
* - encoding: Set by user.
2512
* - decoding: unused
2514
attribute_deprecated int min_partition_order;
2517
* - encoding: Set by user.
2518
* - decoding: unused
2520
attribute_deprecated int max_partition_order;
2527
* GOP timecode frame start number, in non drop frame format
2528
* - encoding: Set by user.
2529
* - decoding: unused
2531
int64_t timecode_frame_start;
2533
#if FF_API_REQUEST_CHANNELS
2535
* Decoder should decode to this many channels if it can (0 for default)
2536
* - encoding: unused
2537
* - decoding: Set by user.
2538
* @deprecated Deprecated in favor of request_channel_layout.
2540
int request_channels;
2544
* Percentage of dynamic range compression to be applied by the decoder.
2545
* The default value is 1.0, corresponding to full compression.
2546
* - encoding: unused
2547
* - decoding: Set by user.
2552
* opaque 64bit number (generally a PTS) that will be reordered and
2553
* output in AVFrame.reordered_opaque
2554
* @deprecated in favor of pkt_pts
2555
* - encoding: unused
2556
* - decoding: Set by user.
2558
int64_t reordered_opaque;
2561
* Bits per sample/pixel of internal libavcodec pixel/sample format.
2562
* This field is applicable only when sample_fmt is AV_SAMPLE_FMT_S32.
2563
* - encoding: set by user.
2564
* - decoding: set by libavcodec.
2566
int bits_per_raw_sample;
2569
* Audio channel layout.
2570
* - encoding: set by user.
2571
* - decoding: set by libavcodec.
2573
int64_t channel_layout;
2576
* Request decoder to use this channel layout if it can (0 for default)
2577
* - encoding: unused
2578
* - decoding: Set by user.
2580
int64_t request_channel_layout;
2583
* Ratecontrol attempt to use, at maximum, <value> of what can be used without an underflow.
2584
* - encoding: Set by user.
2585
* - decoding: unused.
2587
float rc_max_available_vbv_use;
2590
* Ratecontrol attempt to use, at least, <value> times the amount needed to prevent a vbv overflow.
2591
* - encoding: Set by user.
2592
* - decoding: unused.
2594
float rc_min_vbv_overflow_use;
2597
* Hardware accelerator in use
2598
* - encoding: unused.
2599
* - decoding: Set by libavcodec
2601
struct AVHWAccel *hwaccel;
2604
* For some codecs, the time base is closer to the field rate than the frame rate.
2605
* Most notably, H.264 and MPEG-2 specify time_base as half of frame duration
2606
* if no telecine is used ...
2608
* Set to time_base ticks per frame. Default 1, e.g., H.264/MPEG-2 set it to 2.
2610
int ticks_per_frame;
2613
* Hardware accelerator context.
2614
* For some hardware accelerators, a global context needs to be
2615
* provided by the user. In that case, this holds display-dependent
2616
* data Libav cannot instantiate itself. Please refer to the
2617
* Libav HW accelerator documentation to know how to fill this
2618
* is. e.g. for VA API, this is a struct vaapi_context.
2619
* - encoding: unused
2620
* - decoding: Set by user
2622
void *hwaccel_context;
2625
* Chromaticity coordinates of the source primaries.
2626
* - encoding: Set by user
2627
* - decoding: Set by libavcodec
2629
enum AVColorPrimaries color_primaries;
2632
* Color Transfer Characteristic.
2633
* - encoding: Set by user
2634
* - decoding: Set by libavcodec
2636
enum AVColorTransferCharacteristic color_trc;
2639
* YUV colorspace type.
2640
* - encoding: Set by user
2641
* - decoding: Set by libavcodec
2643
enum AVColorSpace colorspace;
2646
* MPEG vs JPEG YUV range.
2647
* - encoding: Set by user
2648
* - decoding: Set by libavcodec
2650
enum AVColorRange color_range;
2653
* This defines the location of chroma samples.
2654
* - encoding: Set by user
2655
* - decoding: Set by libavcodec
2657
enum AVChromaLocation chroma_sample_location;
2660
* The codec may call this to execute several independent things.
2661
* It will return only after finishing all tasks.
2662
* The user may replace this with some multithreaded implementation,
2663
* the default implementation will execute the parts serially.
2664
* Also see avcodec_thread_init and e.g. the --enable-pthread configure option.
2665
* @param c context passed also to func
2666
* @param count the number of things to execute
2667
* @param arg2 argument passed unchanged to func
2668
* @param ret return values of executed functions, must have space for "count" values. May be NULL.
2669
* @param func function that will be called count times, with jobnr from 0 to count-1.
2670
* threadnr will be in the range 0 to c->thread_count-1 < MAX_THREADS and so that no
2671
* two instances of func executing at the same time will have the same threadnr.
2672
* @return always 0 currently, but code should handle a future improvement where when any call to func
2673
* returns < 0 no further calls to func may be done and < 0 is returned.
2674
* - encoding: Set by libavcodec, user can override.
2675
* - decoding: Set by libavcodec, user can override.
2677
int (*execute2)(struct AVCodecContext *c, int (*func)(struct AVCodecContext *c2, void *arg, int jobnr, int threadnr), void *arg2, int *ret, int count);
2680
* explicit P-frame weighted prediction analysis method
2682
* 1: fast blind weighting (one reference duplicate with -1 offset)
2683
* 2: smart weighting (full fade detection analysis)
2684
* - encoding: Set by user.
2685
* - decoding: unused
2687
int weighted_p_pred;
2692
* 1: Variance AQ (complexity mask)
2693
* 2: Auto-variance AQ (experimental)
2694
* - encoding: Set by user
2695
* - decoding: unused
2701
* Reduces blocking and blurring in flat and textured areas.
2702
* - encoding: Set by user
2703
* - decoding: unused
2709
* Strength of psychovisual optimization
2710
* - encoding: Set by user
2711
* - decoding: unused
2717
* Strength of psychovisual optimization
2718
* - encoding: Set by user
2719
* - decoding: unused
2725
* Number of frames for frametype and ratecontrol lookahead
2726
* - encoding: Set by user
2727
* - decoding: unused
2732
* Constant rate factor maximum
2733
* With CRF encoding mode and VBV restrictions enabled, prevents quality from being worse
2734
* than crf_max, even if doing so would violate VBV restrictions.
2735
* - encoding: Set by user.
2736
* - decoding: unused
2740
int log_level_offset;
2742
#if FF_API_FLAC_GLOBAL_OPTS
2744
* Determines which LPC analysis algorithm to use.
2745
* - encoding: Set by user
2746
* - decoding: unused
2748
attribute_deprecated enum AVLPCType lpc_type;
2751
* Number of passes to use for Cholesky factorization during LPC analysis
2752
* - encoding: Set by user
2753
* - decoding: unused
2755
attribute_deprecated int lpc_passes;
2760
* Indicates number of picture subdivisions. Used for parallelized
2762
* - encoding: Set by user
2763
* - decoding: unused
2768
* Header containing style information for text subtitles.
2769
* For SUBTITLE_ASS subtitle type, it should contain the whole ASS
2770
* [Script Info] and [V4+ Styles] section, plus the [Events] line and
2771
* the Format line following. It shouldn't include any Dialogue line.
2772
* - encoding: Set/allocated/freed by user (before avcodec_open())
2773
* - decoding: Set/allocated/freed by libavcodec (by avcodec_open())
2775
uint8_t *subtitle_header;
2776
int subtitle_header_size;
2779
* Current packet as passed into the decoder, to avoid having
2780
* to pass the packet into every function. Currently only valid
2781
* inside lavc and get/release_buffer callbacks.
2782
* - decoding: set by avcodec_decode_*, read by get_buffer() for setting pkt_pts
2783
* - encoding: unused
2788
* Whether this is a copy of the context which had init() called on it.
2789
* This is used by multithreading - shared tables and picture pointers
2790
* should be freed from the original context only.
2791
* - encoding: Set by libavcodec.
2792
* - decoding: Set by libavcodec.
2797
* Which multithreading methods to use.
2798
* Use of FF_THREAD_FRAME will increase decoding delay by one frame per thread,
2799
* so clients which cannot provide future frames should not use it.
2801
* - encoding: Set by user, otherwise the default is used.
2802
* - decoding: Set by user, otherwise the default is used.
2805
#define FF_THREAD_FRAME 1 //< Decode more than one frame at once
2806
#define FF_THREAD_SLICE 2 //< Decode more than one part of a single frame at once
2809
* Which multithreading methods are in use by the codec.
2810
* - encoding: Set by libavcodec.
2811
* - decoding: Set by libavcodec.
2813
int active_thread_type;
2816
* Set by the client if its custom get_buffer() callback can be called
2817
* from another thread, which allows faster multithreaded decoding.
2818
* draw_horiz_band() will be called from other threads regardless of this setting.
2819
* Ignored if the default get_buffer() is used.
2820
* - encoding: Set by user.
2821
* - decoding: Set by user.
2823
int thread_safe_callbacks;
2826
* VBV delay coded in the last frame (in periods of a 27 MHz clock).
2827
* Used for compliant TS muxing.
2828
* - encoding: Set by libavcodec.
2829
* - decoding: unused.
2834
* Type of service that the audio stream conveys.
2835
* - encoding: Set by user.
2836
* - decoding: Set by libavcodec.
2838
enum AVAudioServiceType audio_service_type;
2841
* Used to request a sample format from the decoder.
2842
* - encoding: unused.
2843
* - decoding: Set by user.
2845
enum AVSampleFormat request_sample_fmt;
2851
typedef struct AVProfile {
2853
const char *name; ///< short name for the profile
2859
typedef struct AVCodec {
2861
* Name of the codec implementation.
2862
* The name is globally unique among encoders and among decoders (but an
2863
* encoder and a decoder can share the same name).
2864
* This is the primary way to find a codec from the user perspective.
2867
enum AVMediaType type;
2870
int (*init)(AVCodecContext *);
2871
int (*encode)(AVCodecContext *, uint8_t *buf, int buf_size, void *data);
2872
int (*close)(AVCodecContext *);
2873
int (*decode)(AVCodecContext *, void *outdata, int *outdata_size, AVPacket *avpkt);
2875
* Codec capabilities.
2879
struct AVCodec *next;
2882
* Will be called when seeking
2884
void (*flush)(AVCodecContext *);
2885
const AVRational *supported_framerates; ///< array of supported framerates, or NULL if any, array is terminated by {0,0}
2886
const enum PixelFormat *pix_fmts; ///< array of supported pixel formats, or NULL if unknown, array is terminated by -1
2888
* Descriptive name for the codec, meant to be more human readable than name.
2889
* You should use the NULL_IF_CONFIG_SMALL() macro to define it.
2891
const char *long_name;
2892
const int *supported_samplerates; ///< array of supported audio samplerates, or NULL if unknown, array is terminated by 0
2893
const enum AVSampleFormat *sample_fmts; ///< array of supported sample formats, or NULL if unknown, array is terminated by -1
2894
const int64_t *channel_layouts; ///< array of support channel layouts, or NULL if unknown. array is terminated by 0
2895
uint8_t max_lowres; ///< maximum value for lowres supported by the decoder
2896
const AVClass *priv_class; ///< AVClass for the private context
2897
const AVProfile *profiles; ///< array of recognized profiles, or NULL if unknown, array is terminated by {FF_PROFILE_UNKNOWN}
2900
* @name Frame-level threading support functions
2904
* If defined, called on thread contexts when they are created.
2905
* If the codec allocates writable tables in init(), re-allocate them here.
2906
* priv_data will be set to a copy of the original.
2908
int (*init_thread_copy)(AVCodecContext *);
2910
* Copy necessary context variables from a previous thread context to the current one.
2911
* If not defined, the next thread will start automatically; otherwise, the codec
2912
* must call ff_thread_finish_setup().
2914
* dst and src will (rarely) point to the same context, in which case memcpy should be skipped.
2916
int (*update_thread_context)(AVCodecContext *dst, const AVCodecContext *src);
2923
typedef struct AVHWAccel {
2925
* Name of the hardware accelerated codec.
2926
* The name is globally unique among encoders and among decoders (but an
2927
* encoder and a decoder can share the same name).
2932
* Type of codec implemented by the hardware accelerator.
2934
* See AVMEDIA_TYPE_xxx
2936
enum AVMediaType type;
2939
* Codec implemented by the hardware accelerator.
2946
* Supported pixel format.
2948
* Only hardware accelerated formats are supported here.
2950
enum PixelFormat pix_fmt;
2953
* Hardware accelerated codec capabilities.
2954
* see FF_HWACCEL_CODEC_CAP_*
2958
struct AVHWAccel *next;
2961
* Called at the beginning of each frame or field picture.
2963
* Meaningful frame information (codec specific) is guaranteed to
2964
* be parsed at this point. This function is mandatory.
2966
* Note that buf can be NULL along with buf_size set to 0.
2967
* Otherwise, this means the whole frame is available at this point.
2969
* @param avctx the codec context
2970
* @param buf the frame data buffer base
2971
* @param buf_size the size of the frame in bytes
2972
* @return zero if successful, a negative value otherwise
2974
int (*start_frame)(AVCodecContext *avctx, const uint8_t *buf, uint32_t buf_size);
2977
* Callback for each slice.
2979
* Meaningful slice information (codec specific) is guaranteed to
2980
* be parsed at this point. This function is mandatory.
2982
* @param avctx the codec context
2983
* @param buf the slice data buffer base
2984
* @param buf_size the size of the slice in bytes
2985
* @return zero if successful, a negative value otherwise
2987
int (*decode_slice)(AVCodecContext *avctx, const uint8_t *buf, uint32_t buf_size);
2990
* Called at the end of each frame or field picture.
2992
* The whole picture is parsed at this point and can now be sent
2993
* to the hardware accelerator. This function is mandatory.
2995
* @param avctx the codec context
2996
* @return zero if successful, a negative value otherwise
2998
int (*end_frame)(AVCodecContext *avctx);
3001
* Size of HW accelerator private data.
3003
* Private data is allocated with av_mallocz() before
3004
* AVCodecContext.get_buffer() and deallocated after
3005
* AVCodecContext.release_buffer().
3011
* four components are given, that's all.
3012
* the last component is alpha
3014
typedef struct AVPicture {
3016
int linesize[4]; ///< number of bytes per line
3019
#if FF_API_PALETTE_CONTROL
3022
* This structure defines a method for communicating palette changes
3023
* between and demuxer and a decoder.
3025
* @deprecated Use AVPacket to send palette changes instead.
3026
* This is totally broken.
3028
#define AVPALETTE_SIZE 1024
3029
#define AVPALETTE_COUNT 256
3030
typedef struct AVPaletteControl {
3032
/* Demuxer sets this to 1 to indicate the palette has changed;
3033
* decoder resets to 0. */
3034
int palette_changed;
3036
/* 4-byte ARGB palette entries, stored in native byte order; note that
3037
* the individual palette components should be on a 8-bit scale; if
3038
* the palette data comes from an IBM VGA native format, the component
3039
* data is probably 6 bits in size and needs to be scaled. */
3040
unsigned int palette[AVPALETTE_COUNT];
3042
} AVPaletteControl attribute_deprecated;
3045
enum AVSubtitleType {
3048
SUBTITLE_BITMAP, ///< A bitmap, pict will be set
3051
* Plain text, the text field must be set by the decoder and is
3052
* authoritative. ass and pict fields may contain approximations.
3057
* Formatted text, the ass field must be set by the decoder and is
3058
* authoritative. pict and text fields may contain approximations.
3063
typedef struct AVSubtitleRect {
3064
int x; ///< top left corner of pict, undefined when pict is not set
3065
int y; ///< top left corner of pict, undefined when pict is not set
3066
int w; ///< width of pict, undefined when pict is not set
3067
int h; ///< height of pict, undefined when pict is not set
3068
int nb_colors; ///< number of colors in pict, undefined when pict is not set
3071
* data+linesize for the bitmap of this subtitle.
3072
* can be set for text/ass as well once they where rendered
3075
enum AVSubtitleType type;
3077
char *text; ///< 0 terminated plain UTF-8 text
3080
* 0 terminated ASS/SSA compatible event line.
3081
* The pressentation of this is unaffected by the other values in this
3087
typedef struct AVSubtitle {
3088
uint16_t format; /* 0 = graphics */
3089
uint32_t start_display_time; /* relative to packet pts, in ms */
3090
uint32_t end_display_time; /* relative to packet pts, in ms */
3092
AVSubtitleRect **rects;
3093
int64_t pts; ///< Same as packet pts, in AV_TIME_BASE
3096
/* packet functions */
3099
* @deprecated use NULL instead
3101
attribute_deprecated void av_destruct_packet_nofree(AVPacket *pkt);
3104
* Default packet destructor.
3106
void av_destruct_packet(AVPacket *pkt);
3109
* Initialize optional fields of a packet with default values.
3113
void av_init_packet(AVPacket *pkt);
3116
* Allocate the payload of a packet and initialize its fields with
3120
* @param size wanted payload size
3121
* @return 0 if OK, AVERROR_xxx otherwise
3123
int av_new_packet(AVPacket *pkt, int size);
3126
* Reduce packet size, correctly zeroing padding
3129
* @param size new size
3131
void av_shrink_packet(AVPacket *pkt, int size);
3134
* Increase packet size, correctly zeroing padding
3137
* @param grow_by number of bytes by which to increase the size of the packet
3139
int av_grow_packet(AVPacket *pkt, int grow_by);
3142
* @warning This is a hack - the packet memory allocation stuff is broken. The
3143
* packet is allocated if it was not really allocated.
3145
int av_dup_packet(AVPacket *pkt);
3150
* @param pkt packet to free
3152
void av_free_packet(AVPacket *pkt);
3155
* Allocate new information of a packet.
3158
* @param type side information type
3159
* @param size side information size
3160
* @return pointer to fresh allocated data or NULL otherwise
3162
uint8_t* av_packet_new_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
3166
* Get side information from packet.
3169
* @param type desired side information type
3170
* @param size pointer for side information size to store (optional)
3171
* @return pointer to data if present or NULL otherwise
3173
uint8_t* av_packet_get_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
3178
struct ReSampleContext;
3179
struct AVResampleContext;
3181
typedef struct ReSampleContext ReSampleContext;
3184
* Initialize audio resampling context.
3186
* @param output_channels number of output channels
3187
* @param input_channels number of input channels
3188
* @param output_rate output sample rate
3189
* @param input_rate input sample rate
3190
* @param sample_fmt_out requested output sample format
3191
* @param sample_fmt_in input sample format
3192
* @param filter_length length of each FIR filter in the filterbank relative to the cutoff frequency
3193
* @param log2_phase_count log2 of the number of entries in the polyphase filterbank
3194
* @param linear if 1 then the used FIR filter will be linearly interpolated
3195
between the 2 closest, if 0 the closest will be used
3196
* @param cutoff cutoff frequency, 1.0 corresponds to half the output sampling rate
3197
* @return allocated ReSampleContext, NULL if error occured
3199
ReSampleContext *av_audio_resample_init(int output_channels, int input_channels,
3200
int output_rate, int input_rate,
3201
enum AVSampleFormat sample_fmt_out,
3202
enum AVSampleFormat sample_fmt_in,
3203
int filter_length, int log2_phase_count,
3204
int linear, double cutoff);
3206
int audio_resample(ReSampleContext *s, short *output, short *input, int nb_samples);
3209
* Free resample context.
3211
* @param s a non-NULL pointer to a resample context previously
3212
* created with av_audio_resample_init()
3214
void audio_resample_close(ReSampleContext *s);
3218
* Initialize an audio resampler.
3219
* Note, if either rate is not an integer then simply scale both rates up so they are.
3220
* @param filter_length length of each FIR filter in the filterbank relative to the cutoff freq
3221
* @param log2_phase_count log2 of the number of entries in the polyphase filterbank
3222
* @param linear If 1 then the used FIR filter will be linearly interpolated
3223
between the 2 closest, if 0 the closest will be used
3224
* @param cutoff cutoff frequency, 1.0 corresponds to half the output sampling rate
3226
struct AVResampleContext *av_resample_init(int out_rate, int in_rate, int filter_length, int log2_phase_count, int linear, double cutoff);
3229
* Resample an array of samples using a previously configured context.
3230
* @param src an array of unconsumed samples
3231
* @param consumed the number of samples of src which have been consumed are returned here
3232
* @param src_size the number of unconsumed samples available
3233
* @param dst_size the amount of space in samples available in dst
3234
* @param update_ctx If this is 0 then the context will not be modified, that way several channels can be resampled with the same context.
3235
* @return the number of samples written in dst or -1 if an error occurred
3237
int av_resample(struct AVResampleContext *c, short *dst, short *src, int *consumed, int src_size, int dst_size, int update_ctx);
3241
* Compensate samplerate/timestamp drift. The compensation is done by changing
3242
* the resampler parameters, so no audible clicks or similar distortions occur
3243
* @param compensation_distance distance in output samples over which the compensation should be performed
3244
* @param sample_delta number of output samples which should be output less
3246
* example: av_resample_compensate(c, 10, 500)
3247
* here instead of 510 samples only 500 samples would be output
3249
* note, due to rounding the actual compensation might be slightly different,
3250
* especially if the compensation_distance is large and the in_rate used during init is small
3252
void av_resample_compensate(struct AVResampleContext *c, int sample_delta, int compensation_distance);
3253
void av_resample_close(struct AVResampleContext *c);
3256
* Allocate memory for a picture. Call avpicture_free() to free it.
3258
* \see avpicture_fill()
3260
* @param picture the picture to be filled in
3261
* @param pix_fmt the format of the picture
3262
* @param width the width of the picture
3263
* @param height the height of the picture
3264
* @return zero if successful, a negative value if not
3266
int avpicture_alloc(AVPicture *picture, enum PixelFormat pix_fmt, int width, int height);
3269
* Free a picture previously allocated by avpicture_alloc().
3270
* The data buffer used by the AVPicture is freed, but the AVPicture structure
3273
* @param picture the AVPicture to be freed
3275
void avpicture_free(AVPicture *picture);
3278
* Fill in the AVPicture fields.
3279
* The fields of the given AVPicture are filled in by using the 'ptr' address
3280
* which points to the image data buffer. Depending on the specified picture
3281
* format, one or multiple image data pointers and line sizes will be set.
3282
* If a planar format is specified, several pointers will be set pointing to
3283
* the different picture planes and the line sizes of the different planes
3284
* will be stored in the lines_sizes array.
3285
* Call with ptr == NULL to get the required size for the ptr buffer.
3287
* To allocate the buffer and fill in the AVPicture fields in one call,
3288
* use avpicture_alloc().
3290
* @param picture AVPicture whose fields are to be filled in
3291
* @param ptr Buffer which will contain or contains the actual image data
3292
* @param pix_fmt The format in which the picture data is stored.
3293
* @param width the width of the image in pixels
3294
* @param height the height of the image in pixels
3295
* @return size of the image data in bytes
3297
int avpicture_fill(AVPicture *picture, uint8_t *ptr,
3298
enum PixelFormat pix_fmt, int width, int height);
3301
* Copy pixel data from an AVPicture into a buffer.
3302
* The data is stored compactly, without any gaps for alignment or padding
3303
* which may be applied by avpicture_fill().
3305
* \see avpicture_get_size()
3307
* @param[in] src AVPicture containing image data
3308
* @param[in] pix_fmt The format in which the picture data is stored.
3309
* @param[in] width the width of the image in pixels.
3310
* @param[in] height the height of the image in pixels.
3311
* @param[out] dest A buffer into which picture data will be copied.
3312
* @param[in] dest_size The size of 'dest'.
3313
* @return The number of bytes written to dest, or a negative value (error code) on error.
3315
int avpicture_layout(const AVPicture* src, enum PixelFormat pix_fmt, int width, int height,
3316
unsigned char *dest, int dest_size);
3319
* Calculate the size in bytes that a picture of the given width and height
3320
* would occupy if stored in the given picture format.
3321
* Note that this returns the size of a compact representation as generated
3322
* by avpicture_layout(), which can be smaller than the size required for e.g.
3325
* @param pix_fmt the given picture format
3326
* @param width the width of the image
3327
* @param height the height of the image
3328
* @return Image data size in bytes or -1 on error (e.g. too large dimensions).
3330
int avpicture_get_size(enum PixelFormat pix_fmt, int width, int height);
3331
void avcodec_get_chroma_sub_sample(enum PixelFormat pix_fmt, int *h_shift, int *v_shift);
3333
#if FF_API_GET_PIX_FMT_NAME
3335
* @deprecated Deprecated in favor of av_get_pix_fmt_name().
3337
attribute_deprecated
3338
const char *avcodec_get_pix_fmt_name(enum PixelFormat pix_fmt);
3341
void avcodec_set_dimensions(AVCodecContext *s, int width, int height);
3344
* Return a value representing the fourCC code associated to the
3345
* pixel format pix_fmt, or 0 if no associated fourCC code can be
3348
unsigned int avcodec_pix_fmt_to_codec_tag(enum PixelFormat pix_fmt);
3351
* Put a string representing the codec tag codec_tag in buf.
3353
* @param buf_size size in bytes of buf
3354
* @return the length of the string that would have been generated if
3355
* enough space had been available, excluding the trailing null
3357
size_t av_get_codec_tag_string(char *buf, size_t buf_size, unsigned int codec_tag);
3359
#define FF_LOSS_RESOLUTION 0x0001 /**< loss due to resolution change */
3360
#define FF_LOSS_DEPTH 0x0002 /**< loss due to color depth change */
3361
#define FF_LOSS_COLORSPACE 0x0004 /**< loss due to color space conversion */
3362
#define FF_LOSS_ALPHA 0x0008 /**< loss of alpha bits */
3363
#define FF_LOSS_COLORQUANT 0x0010 /**< loss due to color quantization */
3364
#define FF_LOSS_CHROMA 0x0020 /**< loss of chroma (e.g. RGB to gray conversion) */
3367
* Compute what kind of losses will occur when converting from one specific
3368
* pixel format to another.
3369
* When converting from one pixel format to another, information loss may occur.
3370
* For example, when converting from RGB24 to GRAY, the color information will
3371
* be lost. Similarly, other losses occur when converting from some formats to
3372
* other formats. These losses can involve loss of chroma, but also loss of
3373
* resolution, loss of color depth, loss due to the color space conversion, loss
3374
* of the alpha bits or loss due to color quantization.
3375
* avcodec_get_fix_fmt_loss() informs you about the various types of losses
3376
* which will occur when converting from one pixel format to another.
3378
* @param[in] dst_pix_fmt destination pixel format
3379
* @param[in] src_pix_fmt source pixel format
3380
* @param[in] has_alpha Whether the source pixel format alpha channel is used.
3381
* @return Combination of flags informing you what kind of losses will occur.
3383
int avcodec_get_pix_fmt_loss(enum PixelFormat dst_pix_fmt, enum PixelFormat src_pix_fmt,
3387
* Find the best pixel format to convert to given a certain source pixel
3388
* format. When converting from one pixel format to another, information loss
3389
* may occur. For example, when converting from RGB24 to GRAY, the color
3390
* information will be lost. Similarly, other losses occur when converting from
3391
* some formats to other formats. avcodec_find_best_pix_fmt() searches which of
3392
* the given pixel formats should be used to suffer the least amount of loss.
3393
* The pixel formats from which it chooses one, are determined by the
3394
* pix_fmt_mask parameter.
3397
* src_pix_fmt = PIX_FMT_YUV420P;
3398
* pix_fmt_mask = (1 << PIX_FMT_YUV422P) || (1 << PIX_FMT_RGB24);
3399
* dst_pix_fmt = avcodec_find_best_pix_fmt(pix_fmt_mask, src_pix_fmt, alpha, &loss);
3402
* @param[in] pix_fmt_mask bitmask determining which pixel format to choose from
3403
* @param[in] src_pix_fmt source pixel format
3404
* @param[in] has_alpha Whether the source pixel format alpha channel is used.
3405
* @param[out] loss_ptr Combination of flags informing you what kind of losses will occur.
3406
* @return The best pixel format to convert to or -1 if none was found.
3408
enum PixelFormat avcodec_find_best_pix_fmt(int64_t pix_fmt_mask, enum PixelFormat src_pix_fmt,
3409
int has_alpha, int *loss_ptr);
3411
#define FF_ALPHA_TRANSP 0x0001 /* image has some totally transparent pixels */
3412
#define FF_ALPHA_SEMI_TRANSP 0x0002 /* image has some transparent pixels */
3415
* Tell if an image really has transparent alpha values.
3416
* @return ored mask of FF_ALPHA_xxx constants
3418
int img_get_alpha_info(const AVPicture *src,
3419
enum PixelFormat pix_fmt, int width, int height);
3421
/* deinterlace a picture */
3422
/* deinterlace - if not supported return -1 */
3423
int avpicture_deinterlace(AVPicture *dst, const AVPicture *src,
3424
enum PixelFormat pix_fmt, int width, int height);
3426
/* external high level API */
3429
* If c is NULL, returns the first registered codec,
3430
* if c is non-NULL, returns the next registered codec after c,
3431
* or NULL if c is the last one.
3433
AVCodec *av_codec_next(AVCodec *c);
3436
* Return the LIBAVCODEC_VERSION_INT constant.
3438
unsigned avcodec_version(void);
3441
* Return the libavcodec build-time configuration.
3443
const char *avcodec_configuration(void);
3446
* Return the libavcodec license.
3448
const char *avcodec_license(void);
3451
* Initialize libavcodec.
3452
* If called more than once, does nothing.
3454
* @warning This function must be called before any other libavcodec
3457
* @warning This function is not thread-safe.
3459
void avcodec_init(void);
3462
* Register the codec codec and initialize libavcodec.
3464
* @see avcodec_init(), avcodec_register_all()
3466
void avcodec_register(AVCodec *codec);
3469
* Find a registered encoder with a matching codec ID.
3471
* @param id CodecID of the requested encoder
3472
* @return An encoder if one was found, NULL otherwise.
3474
AVCodec *avcodec_find_encoder(enum CodecID id);
3477
* Find a registered encoder with the specified name.
3479
* @param name name of the requested encoder
3480
* @return An encoder if one was found, NULL otherwise.
3482
AVCodec *avcodec_find_encoder_by_name(const char *name);
3485
* Find a registered decoder with a matching codec ID.
3487
* @param id CodecID of the requested decoder
3488
* @return A decoder if one was found, NULL otherwise.
3490
AVCodec *avcodec_find_decoder(enum CodecID id);
3493
* Find a registered decoder with the specified name.
3495
* @param name name of the requested decoder
3496
* @return A decoder if one was found, NULL otherwise.
3498
AVCodec *avcodec_find_decoder_by_name(const char *name);
3499
void avcodec_string(char *buf, int buf_size, AVCodecContext *enc, int encode);
3502
* Return a name for the specified profile, if available.
3504
* @param codec the codec that is searched for the given profile
3505
* @param profile the profile value for which a name is requested
3506
* @return A name for the profile if found, NULL otherwise.
3508
const char *av_get_profile_name(const AVCodec *codec, int profile);
3511
* Set the fields of the given AVCodecContext to default values.
3513
* @param s The AVCodecContext of which the fields should be set to default values.
3515
void avcodec_get_context_defaults(AVCodecContext *s);
3517
/** THIS FUNCTION IS NOT YET PART OF THE PUBLIC API!
3518
* we WILL change its arguments and name a few times! */
3519
void avcodec_get_context_defaults2(AVCodecContext *s, enum AVMediaType);
3521
/** THIS FUNCTION IS NOT YET PART OF THE PUBLIC API!
3522
* we WILL change its arguments and name a few times! */
3523
int avcodec_get_context_defaults3(AVCodecContext *s, AVCodec *codec);
3526
* Allocate an AVCodecContext and set its fields to default values. The
3527
* resulting struct can be deallocated by simply calling av_free().
3529
* @return An AVCodecContext filled with default values or NULL on failure.
3530
* @see avcodec_get_context_defaults
3532
AVCodecContext *avcodec_alloc_context(void);
3534
/** THIS FUNCTION IS NOT YET PART OF THE PUBLIC API!
3535
* we WILL change its arguments and name a few times! */
3536
AVCodecContext *avcodec_alloc_context2(enum AVMediaType);
3538
/** THIS FUNCTION IS NOT YET PART OF THE PUBLIC API!
3539
* we WILL change its arguments and name a few times! */
3540
AVCodecContext *avcodec_alloc_context3(AVCodec *codec);
3543
* Copy the settings of the source AVCodecContext into the destination
3544
* AVCodecContext. The resulting destination codec context will be
3545
* unopened, i.e. you are required to call avcodec_open() before you
3546
* can use this AVCodecContext to decode/encode video/audio data.
3548
* @param dest target codec context, should be initialized with
3549
* avcodec_alloc_context(), but otherwise uninitialized
3550
* @param src source codec context
3551
* @return AVERROR() on error (e.g. memory allocation error), 0 on success
3553
int avcodec_copy_context(AVCodecContext *dest, const AVCodecContext *src);
3556
* Set the fields of the given AVFrame to default values.
3558
* @param pic The AVFrame of which the fields should be set to default values.
3560
void avcodec_get_frame_defaults(AVFrame *pic);
3563
* Allocate an AVFrame and set its fields to default values. The resulting
3564
* struct can be deallocated by simply calling av_free().
3566
* @return An AVFrame filled with default values or NULL on failure.
3567
* @see avcodec_get_frame_defaults
3569
AVFrame *avcodec_alloc_frame(void);
3571
int avcodec_default_get_buffer(AVCodecContext *s, AVFrame *pic);
3572
void avcodec_default_release_buffer(AVCodecContext *s, AVFrame *pic);
3573
int avcodec_default_reget_buffer(AVCodecContext *s, AVFrame *pic);
3576
* Return the amount of padding in pixels which the get_buffer callback must
3577
* provide around the edge of the image for codecs which do not have the
3578
* CODEC_FLAG_EMU_EDGE flag.
3580
* @return Required padding in pixels.
3582
unsigned avcodec_get_edge_width(void);
3584
* Modify width and height values so that they will result in a memory
3585
* buffer that is acceptable for the codec if you do not use any horizontal
3588
* May only be used if a codec with CODEC_CAP_DR1 has been opened.
3589
* If CODEC_FLAG_EMU_EDGE is not set, the dimensions must have been increased
3590
* according to avcodec_get_edge_width() before.
3592
void avcodec_align_dimensions(AVCodecContext *s, int *width, int *height);
3594
* Modify width and height values so that they will result in a memory
3595
* buffer that is acceptable for the codec if you also ensure that all
3596
* line sizes are a multiple of the respective linesize_align[i].
3598
* May only be used if a codec with CODEC_CAP_DR1 has been opened.
3599
* If CODEC_FLAG_EMU_EDGE is not set, the dimensions must have been increased
3600
* according to avcodec_get_edge_width() before.
3602
void avcodec_align_dimensions2(AVCodecContext *s, int *width, int *height,
3603
int linesize_align[4]);
3605
enum PixelFormat avcodec_default_get_format(struct AVCodecContext *s, const enum PixelFormat * fmt);
3607
#if FF_API_THREAD_INIT
3609
* @deprecated Set s->thread_count before calling avcodec_open() instead of calling this.
3611
attribute_deprecated
3612
int avcodec_thread_init(AVCodecContext *s, int thread_count);
3615
int avcodec_default_execute(AVCodecContext *c, int (*func)(AVCodecContext *c2, void *arg2),void *arg, int *ret, int count, int size);
3616
int avcodec_default_execute2(AVCodecContext *c, int (*func)(AVCodecContext *c2, void *arg2, int, int),void *arg, int *ret, int count);
3617
//FIXME func typedef
3620
* Initialize the AVCodecContext to use the given AVCodec. Prior to using this
3621
* function the context has to be allocated.
3623
* The functions avcodec_find_decoder_by_name(), avcodec_find_encoder_by_name(),
3624
* avcodec_find_decoder() and avcodec_find_encoder() provide an easy way for
3625
* retrieving a codec.
3627
* @warning This function is not thread safe!
3630
* avcodec_register_all();
3631
* codec = avcodec_find_decoder(CODEC_ID_H264);
3635
* context = avcodec_alloc_context();
3637
* if (avcodec_open(context, codec) < 0)
3641
* @param avctx The context which will be set up to use the given codec.
3642
* @param codec The codec to use within the context.
3643
* @return zero on success, a negative value on error
3644
* @see avcodec_alloc_context, avcodec_find_decoder, avcodec_find_encoder, avcodec_close
3646
int avcodec_open(AVCodecContext *avctx, AVCodec *codec);
3649
* Decode the audio frame of size avpkt->size from avpkt->data into samples.
3650
* Some decoders may support multiple frames in a single AVPacket, such
3651
* decoders would then just decode the first frame. In this case,
3652
* avcodec_decode_audio3 has to be called again with an AVPacket that contains
3653
* the remaining data in order to decode the second frame etc.
3655
* could be outputted, frame_size_ptr is zero. Otherwise, it is the
3656
* decompressed frame size in bytes.
3658
* @warning You must set frame_size_ptr to the allocated size of the
3659
* output buffer before calling avcodec_decode_audio3().
3661
* @warning The input buffer must be FF_INPUT_BUFFER_PADDING_SIZE larger than
3662
* the actual read bytes because some optimized bitstream readers read 32 or 64
3663
* bits at once and could read over the end.
3665
* @warning The end of the input buffer avpkt->data should be set to 0 to ensure that
3666
* no overreading happens for damaged MPEG streams.
3668
* @note You might have to align the input buffer avpkt->data and output buffer
3669
* samples. The alignment requirements depend on the CPU: On some CPUs it isn't
3670
* necessary at all, on others it won't work at all if not aligned and on others
3671
* it will work but it will have an impact on performance.
3673
* In practice, avpkt->data should have 4 byte alignment at minimum and
3674
* samples should be 16 byte aligned unless the CPU doesn't need it
3675
* (AltiVec and SSE do).
3677
* @param avctx the codec context
3678
* @param[out] samples the output buffer, sample type in avctx->sample_fmt
3679
* @param[in,out] frame_size_ptr the output buffer size in bytes
3680
* @param[in] avpkt The input AVPacket containing the input buffer.
3681
* You can create such packet with av_init_packet() and by then setting
3682
* data and size, some decoders might in addition need other fields.
3683
* All decoders are designed to use the least fields possible though.
3684
* @return On error a negative value is returned, otherwise the number of bytes
3685
* used or zero if no frame data was decompressed (used) from the input AVPacket.
3687
int avcodec_decode_audio3(AVCodecContext *avctx, int16_t *samples,
3688
int *frame_size_ptr,
3692
* Decode the video frame of size avpkt->size from avpkt->data into picture.
3693
* Some decoders may support multiple frames in a single AVPacket, such
3694
* decoders would then just decode the first frame.
3696
* @warning The input buffer must be FF_INPUT_BUFFER_PADDING_SIZE larger than
3697
* the actual read bytes because some optimized bitstream readers read 32 or 64
3698
* bits at once and could read over the end.
3700
* @warning The end of the input buffer buf should be set to 0 to ensure that
3701
* no overreading happens for damaged MPEG streams.
3703
* @note You might have to align the input buffer avpkt->data.
3704
* The alignment requirements depend on the CPU: on some CPUs it isn't
3705
* necessary at all, on others it won't work at all if not aligned and on others
3706
* it will work but it will have an impact on performance.
3708
* In practice, avpkt->data should have 4 byte alignment at minimum.
3710
* @note Some codecs have a delay between input and output, these need to be
3711
* fed with avpkt->data=NULL, avpkt->size=0 at the end to return the remaining frames.
3713
* @param avctx the codec context
3714
* @param[out] picture The AVFrame in which the decoded video frame will be stored.
3715
* Use avcodec_alloc_frame to get an AVFrame, the codec will
3716
* allocate memory for the actual bitmap.
3717
* with default get/release_buffer(), the decoder frees/reuses the bitmap as it sees fit.
3718
* with overridden get/release_buffer() (needs CODEC_CAP_DR1) the user decides into what buffer the decoder
3719
* decodes and the decoder tells the user once it does not need the data anymore,
3720
* the user app can at this point free/reuse/keep the memory as it sees fit.
3722
* @param[in] avpkt The input AVpacket containing the input buffer.
3723
* You can create such packet with av_init_packet() and by then setting
3724
* data and size, some decoders might in addition need other fields like
3725
* flags&AV_PKT_FLAG_KEY. All decoders are designed to use the least
3727
* @param[in,out] got_picture_ptr Zero if no frame could be decompressed, otherwise, it is nonzero.
3728
* @return On error a negative value is returned, otherwise the number of bytes
3729
* used or zero if no frame could be decompressed.
3731
int avcodec_decode_video2(AVCodecContext *avctx, AVFrame *picture,
3732
int *got_picture_ptr,
3736
* Decode a subtitle message.
3737
* Return a negative value on error, otherwise return the number of bytes used.
3738
* If no subtitle could be decompressed, got_sub_ptr is zero.
3739
* Otherwise, the subtitle is stored in *sub.
3740
* Note that CODEC_CAP_DR1 is not available for subtitle codecs. This is for
3741
* simplicity, because the performance difference is expect to be negligible
3742
* and reusing a get_buffer written for video codecs would probably perform badly
3743
* due to a potentially very different allocation pattern.
3745
* @param avctx the codec context
3746
* @param[out] sub The AVSubtitle in which the decoded subtitle will be stored, must be
3747
freed with avsubtitle_free if *got_sub_ptr is set.
3748
* @param[in,out] got_sub_ptr Zero if no subtitle could be decompressed, otherwise, it is nonzero.
3749
* @param[in] avpkt The input AVPacket containing the input buffer.
3751
int avcodec_decode_subtitle2(AVCodecContext *avctx, AVSubtitle *sub,
3756
* Frees all allocated data in the given subtitle struct.
3758
* @param sub AVSubtitle to free.
3760
void avsubtitle_free(AVSubtitle *sub);
3762
int avcodec_parse_frame(AVCodecContext *avctx, uint8_t **pdata,
3764
uint8_t *buf, int buf_size);
3767
* Encode an audio frame from samples into buf.
3769
* @note The output buffer should be at least FF_MIN_BUFFER_SIZE bytes large.
3770
* However, for PCM audio the user will know how much space is needed
3771
* because it depends on the value passed in buf_size as described
3772
* below. In that case a lower value can be used.
3774
* @param avctx the codec context
3775
* @param[out] buf the output buffer
3776
* @param[in] buf_size the output buffer size
3777
* @param[in] samples the input buffer containing the samples
3778
* The number of samples read from this buffer is frame_size*channels,
3779
* both of which are defined in avctx.
3780
* For PCM audio the number of samples read from samples is equal to
3781
* buf_size * input_sample_size / output_sample_size.
3782
* @return On error a negative value is returned, on success zero or the number
3783
* of bytes used to encode the data read from the input buffer.
3785
int avcodec_encode_audio(AVCodecContext *avctx, uint8_t *buf, int buf_size,
3786
const short *samples);
3789
* Encode a video frame from pict into buf.
3790
* The input picture should be
3791
* stored using a specific format, namely avctx.pix_fmt.
3793
* @param avctx the codec context
3794
* @param[out] buf the output buffer for the bitstream of encoded frame
3795
* @param[in] buf_size the size of the output buffer in bytes
3796
* @param[in] pict the input picture to encode
3797
* @return On error a negative value is returned, on success zero or the number
3798
* of bytes used from the output buffer.
3800
int avcodec_encode_video(AVCodecContext *avctx, uint8_t *buf, int buf_size,
3801
const AVFrame *pict);
3802
int avcodec_encode_subtitle(AVCodecContext *avctx, uint8_t *buf, int buf_size,
3803
const AVSubtitle *sub);
3805
int avcodec_close(AVCodecContext *avctx);
3808
* Register all the codecs, parsers and bitstream filters which were enabled at
3809
* configuration time. If you do not call this function you can select exactly
3810
* which formats you want to support, by using the individual registration
3813
* @see avcodec_register
3814
* @see av_register_codec_parser
3815
* @see av_register_bitstream_filter
3817
void avcodec_register_all(void);
3820
* Flush buffers, should be called when seeking or when switching to a different stream.
3822
void avcodec_flush_buffers(AVCodecContext *avctx);
3824
void avcodec_default_free_buffers(AVCodecContext *s);
3826
/* misc useful functions */
3828
#if FF_API_OLD_FF_PICT_TYPES
3830
* Return a single letter to describe the given picture type pict_type.
3832
* @param[in] pict_type the picture type
3833
* @return A single character representing the picture type.
3834
* @deprecated Use av_get_picture_type_char() instead.
3836
attribute_deprecated
3837
char av_get_pict_type_char(int pict_type);
3841
* Return codec bits per sample.
3843
* @param[in] codec_id the codec
3844
* @return Number of bits per sample or zero if unknown for the given codec.
3846
int av_get_bits_per_sample(enum CodecID codec_id);
3848
#if FF_API_OLD_SAMPLE_FMT
3850
* @deprecated Use av_get_bytes_per_sample() instead.
3852
attribute_deprecated
3853
int av_get_bits_per_sample_format(enum AVSampleFormat sample_fmt);
3857
typedef struct AVCodecParserContext {
3859
struct AVCodecParser *parser;
3860
int64_t frame_offset; /* offset of the current frame */
3861
int64_t cur_offset; /* current offset
3862
(incremented by each av_parser_parse()) */
3863
int64_t next_frame_offset; /* offset of the next frame */
3865
int pict_type; /* XXX: Put it back in AVCodecContext. */
3867
* This field is used for proper frame duration computation in lavf.
3868
* It signals, how much longer the frame duration of the current frame
3869
* is compared to normal frame duration.
3871
* frame_duration = (1 + repeat_pict) * time_base
3873
* It is used by codecs like H.264 to display telecined material.
3875
int repeat_pict; /* XXX: Put it back in AVCodecContext. */
3876
int64_t pts; /* pts of the current frame */
3877
int64_t dts; /* dts of the current frame */
3882
int fetch_timestamp;
3884
#define AV_PARSER_PTS_NB 4
3885
int cur_frame_start_index;
3886
int64_t cur_frame_offset[AV_PARSER_PTS_NB];
3887
int64_t cur_frame_pts[AV_PARSER_PTS_NB];
3888
int64_t cur_frame_dts[AV_PARSER_PTS_NB];
3891
#define PARSER_FLAG_COMPLETE_FRAMES 0x0001
3892
#define PARSER_FLAG_ONCE 0x0002
3893
/// Set if the parser has a valid file offset
3894
#define PARSER_FLAG_FETCHED_OFFSET 0x0004
3896
int64_t offset; ///< byte offset from starting packet start
3897
int64_t cur_frame_end[AV_PARSER_PTS_NB];
3900
* Set by parser to 1 for key frames and 0 for non-key frames.
3901
* It is initialized to -1, so if the parser doesn't set this flag,
3902
* old-style fallback using AV_PICTURE_TYPE_I picture type as key frames
3908
* Time difference in stream time base units from the pts of this
3909
* packet to the point at which the output from the decoder has converged
3910
* independent from the availability of previous frames. That is, the
3911
* frames are virtually identical no matter if decoding started from
3912
* the very first frame or from this keyframe.
3913
* Is AV_NOPTS_VALUE if unknown.
3914
* This field is not the display duration of the current frame.
3915
* This field has no meaning if the packet does not have AV_PKT_FLAG_KEY
3918
* The purpose of this field is to allow seeking in streams that have no
3919
* keyframes in the conventional sense. It corresponds to the
3920
* recovery point SEI in H.264 and match_time_delta in NUT. It is also
3921
* essential for some types of subtitle streams to ensure that all
3922
* subtitles are correctly displayed after seeking.
3924
int64_t convergence_duration;
3926
// Timestamp generation support:
3928
* Synchronization point for start of timestamp generation.
3930
* Set to >0 for sync point, 0 for no sync point and <0 for undefined
3933
* For example, this corresponds to presence of H.264 buffering period
3939
* Offset of the current timestamp against last timestamp sync point in
3940
* units of AVCodecContext.time_base.
3942
* Set to INT_MIN when dts_sync_point unused. Otherwise, it must
3943
* contain a valid timestamp offset.
3945
* Note that the timestamp of sync point has usually a nonzero
3946
* dts_ref_dts_delta, which refers to the previous sync point. Offset of
3947
* the next frame after timestamp sync point will be usually 1.
3949
* For example, this corresponds to H.264 cpb_removal_delay.
3951
int dts_ref_dts_delta;
3954
* Presentation delay of current frame in units of AVCodecContext.time_base.
3956
* Set to INT_MIN when dts_sync_point unused. Otherwise, it must
3957
* contain valid non-negative timestamp delta (presentation time of a frame
3958
* must not lie in the past).
3960
* This delay represents the difference between decoding and presentation
3961
* time of the frame.
3963
* For example, this corresponds to H.264 dpb_output_delay.
3968
* Position of the packet in file.
3970
* Analogous to cur_frame_pts/dts
3972
int64_t cur_frame_pos[AV_PARSER_PTS_NB];
3975
* Byte position of currently parsed frame in stream.
3980
* Previous frame byte position.
3983
} AVCodecParserContext;
3985
typedef struct AVCodecParser {
3986
int codec_ids[5]; /* several codec IDs are permitted */
3988
int (*parser_init)(AVCodecParserContext *s);
3989
int (*parser_parse)(AVCodecParserContext *s,
3990
AVCodecContext *avctx,
3991
const uint8_t **poutbuf, int *poutbuf_size,
3992
const uint8_t *buf, int buf_size);
3993
void (*parser_close)(AVCodecParserContext *s);
3994
int (*split)(AVCodecContext *avctx, const uint8_t *buf, int buf_size);
3995
struct AVCodecParser *next;
3998
AVCodecParser *av_parser_next(AVCodecParser *c);
4000
void av_register_codec_parser(AVCodecParser *parser);
4001
AVCodecParserContext *av_parser_init(int codec_id);
4006
* @param s parser context.
4007
* @param avctx codec context.
4008
* @param poutbuf set to pointer to parsed buffer or NULL if not yet finished.
4009
* @param poutbuf_size set to size of parsed buffer or zero if not yet finished.
4010
* @param buf input buffer.
4011
* @param buf_size input length, to signal EOF, this should be 0 (so that the last frame can be output).
4012
* @param pts input presentation timestamp.
4013
* @param dts input decoding timestamp.
4014
* @param pos input byte position in stream.
4015
* @return the number of bytes of the input bitstream used.
4020
* len = av_parser_parse2(myparser, AVCodecContext, &data, &size,
4027
* decode_frame(data, size);
4031
int av_parser_parse2(AVCodecParserContext *s,
4032
AVCodecContext *avctx,
4033
uint8_t **poutbuf, int *poutbuf_size,
4034
const uint8_t *buf, int buf_size,
4035
int64_t pts, int64_t dts,
4038
int av_parser_change(AVCodecParserContext *s,
4039
AVCodecContext *avctx,
4040
uint8_t **poutbuf, int *poutbuf_size,
4041
const uint8_t *buf, int buf_size, int keyframe);
4042
void av_parser_close(AVCodecParserContext *s);
4045
typedef struct AVBitStreamFilterContext {
4047
struct AVBitStreamFilter *filter;
4048
AVCodecParserContext *parser;
4049
struct AVBitStreamFilterContext *next;
4050
} AVBitStreamFilterContext;
4053
typedef struct AVBitStreamFilter {
4056
int (*filter)(AVBitStreamFilterContext *bsfc,
4057
AVCodecContext *avctx, const char *args,
4058
uint8_t **poutbuf, int *poutbuf_size,
4059
const uint8_t *buf, int buf_size, int keyframe);
4060
void (*close)(AVBitStreamFilterContext *bsfc);
4061
struct AVBitStreamFilter *next;
4062
} AVBitStreamFilter;
4064
void av_register_bitstream_filter(AVBitStreamFilter *bsf);
4065
AVBitStreamFilterContext *av_bitstream_filter_init(const char *name);
4066
int av_bitstream_filter_filter(AVBitStreamFilterContext *bsfc,
4067
AVCodecContext *avctx, const char *args,
4068
uint8_t **poutbuf, int *poutbuf_size,
4069
const uint8_t *buf, int buf_size, int keyframe);
4070
void av_bitstream_filter_close(AVBitStreamFilterContext *bsf);
4072
AVBitStreamFilter *av_bitstream_filter_next(AVBitStreamFilter *f);
4077
* Reallocate the given block if it is not large enough, otherwise do nothing.
4081
void *av_fast_realloc(void *ptr, unsigned int *size, size_t min_size);
4084
* Allocate a buffer, reusing the given one if large enough.
4086
* Contrary to av_fast_realloc the current buffer contents might not be
4087
* preserved and on error the old buffer is freed, thus no special
4088
* handling to avoid memleaks is necessary.
4090
* @param ptr pointer to pointer to already allocated buffer, overwritten with pointer to new buffer
4091
* @param size size of the buffer *ptr points to
4092
* @param min_size minimum size of *ptr buffer after returning, *ptr will be NULL and
4093
* *size 0 if an error occurred.
4095
void av_fast_malloc(void *ptr, unsigned int *size, size_t min_size);
4098
* Copy image src to dst. Wraps av_picture_data_copy() above.
4100
void av_picture_copy(AVPicture *dst, const AVPicture *src,
4101
enum PixelFormat pix_fmt, int width, int height);
4104
* Crop image top and left side.
4106
int av_picture_crop(AVPicture *dst, const AVPicture *src,
4107
enum PixelFormat pix_fmt, int top_band, int left_band);
4112
int av_picture_pad(AVPicture *dst, const AVPicture *src, int height, int width, enum PixelFormat pix_fmt,
4113
int padtop, int padbottom, int padleft, int padright, int *color);
4116
* Encode extradata length to a buffer. Used by xiph codecs.
4118
* @param s buffer to write to; must be at least (v/255+1) bytes long
4119
* @param v size of extradata in bytes
4120
* @return number of bytes written to the buffer.
4122
unsigned int av_xiphlacing(unsigned char *s, unsigned int v);
4125
* Logs a generic warning message about a missing feature. This function is
4126
* intended to be used internally by Libav (libavcodec, libavformat, etc.)
4127
* only, and would normally not be used by applications.
4128
* @param[in] avc a pointer to an arbitrary struct of which the first field is
4129
* a pointer to an AVClass struct
4130
* @param[in] feature string containing the name of the missing feature
4131
* @param[in] want_sample indicates if samples are wanted which exhibit this feature.
4132
* If want_sample is non-zero, additional verbage will be added to the log
4133
* message which tells the user how to report samples to the development
4136
void av_log_missing_feature(void *avc, const char *feature, int want_sample);
4139
* Log a generic warning message asking for a sample. This function is
4140
* intended to be used internally by Libav (libavcodec, libavformat, etc.)
4141
* only, and would normally not be used by applications.
4142
* @param[in] avc a pointer to an arbitrary struct of which the first field is
4143
* a pointer to an AVClass struct
4144
* @param[in] msg string containing an optional message, or NULL if no message
4146
void av_log_ask_for_sample(void *avc, const char *msg, ...);
4149
* Register the hardware accelerator hwaccel.
4151
void av_register_hwaccel(AVHWAccel *hwaccel);
4154
* If hwaccel is NULL, returns the first registered hardware accelerator,
4155
* if hwaccel is non-NULL, returns the next registered hardware accelerator
4156
* after hwaccel, or NULL if hwaccel is the last one.
4158
AVHWAccel *av_hwaccel_next(AVHWAccel *hwaccel);
4162
* Lock operation used by lockmgr
4165
AV_LOCK_CREATE, ///< Create a mutex
4166
AV_LOCK_OBTAIN, ///< Lock the mutex
4167
AV_LOCK_RELEASE, ///< Unlock the mutex
4168
AV_LOCK_DESTROY, ///< Free mutex resources
4172
* Register a user provided lock manager supporting the operations
4173
* specified by AVLockOp. mutex points to a (void *) where the
4174
* lockmgr should store/get a pointer to a user allocated mutex. It's
4175
* NULL upon AV_LOCK_CREATE and != NULL for all other ops.
4177
* @param cb User defined callback. Note: Libav may invoke calls to this
4178
* callback during the call to av_lockmgr_register().
4179
* Thus, the application must be prepared to handle that.
4180
* If cb is set to NULL the lockmgr will be unregistered.
4181
* Also note that during unregistration the previously registered
4182
* lockmgr callback may also be invoked.
4184
int av_lockmgr_register(int (*cb)(void **mutex, enum AVLockOp op));
4186
#endif /* AVCODEC_AVCODEC_H */