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/*
* copyright (c) 2001 Fabrice Bellard
*
* This file is part of Libav.
*
* Libav is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* Libav is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with Libav; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/

#ifndef AVCODEC_AVCODEC_H
#define AVCODEC_AVCODEC_H

/**
* @file
* external API header
*/

#include <errno.h>
#include "libavutil/samplefmt.h"
#include "libavutil/avutil.h"
#include "libavutil/cpu.h"
#include "libavutil/dict.h"
#include "libavutil/log.h"
#include "libavutil/pixfmt.h"
#include "libavutil/rational.h"

#include "libavcodec/version.h"
/**
* @defgroup libavc Encoding/Decoding Library
* @{
*
* @defgroup lavc_decoding Decoding
* @{
* @}
*
* @defgroup lavc_encoding Encoding
* @{
* @}
*
* @defgroup lavc_codec Codecs
* @{
* @defgroup lavc_codec_native Native Codecs
* @{
* @}
* @defgroup lavc_codec_wrappers External library wrappers
* @{
* @}
* @defgroup lavc_codec_hwaccel Hardware Accelerators bridge
* @{
* @}
* @}
* @defgroup lavc_internal Internal
* @{
* @}
* @}
*
*/


/**
* Identify the syntax and semantics of the bitstream.
* The principle is roughly:
* Two decoders with the same ID can decode the same streams.
* Two encoders with the same ID can encode compatible streams.
* There may be slight deviations from the principle due to implementation
* details.
*
* If you add a codec ID to this list, add it so that
* 1. no value of a existing codec ID changes (that would break ABI),
* 2. it is as close as possible to similar codecs.
*/
enum CodecID {
    CODEC_ID_NONE,

    /* video codecs */
    CODEC_ID_MPEG1VIDEO,
    CODEC_ID_MPEG2VIDEO, ///< preferred ID for MPEG-1/2 video decoding
    CODEC_ID_MPEG2VIDEO_XVMC,
    CODEC_ID_H261,
    CODEC_ID_H263,
    CODEC_ID_RV10,
    CODEC_ID_RV20,
    CODEC_ID_MJPEG,
    CODEC_ID_MJPEGB,
    CODEC_ID_LJPEG,
    CODEC_ID_SP5X,
    CODEC_ID_JPEGLS,
    CODEC_ID_MPEG4,
    CODEC_ID_RAWVIDEO,
    CODEC_ID_MSMPEG4V1,
    CODEC_ID_MSMPEG4V2,
    CODEC_ID_MSMPEG4V3,
    CODEC_ID_WMV1,
    CODEC_ID_WMV2,
    CODEC_ID_H263P,
    CODEC_ID_H263I,
    CODEC_ID_FLV1,
    CODEC_ID_SVQ1,
    CODEC_ID_SVQ3,
    CODEC_ID_DVVIDEO,
    CODEC_ID_HUFFYUV,
    CODEC_ID_CYUV,
    CODEC_ID_H264,
    CODEC_ID_INDEO3,
    CODEC_ID_VP3,
    CODEC_ID_THEORA,
    CODEC_ID_ASV1,
    CODEC_ID_ASV2,
    CODEC_ID_FFV1,
    CODEC_ID_4XM,
    CODEC_ID_VCR1,
    CODEC_ID_CLJR,
    CODEC_ID_MDEC,
    CODEC_ID_ROQ,
    CODEC_ID_INTERPLAY_VIDEO,
    CODEC_ID_XAN_WC3,
    CODEC_ID_XAN_WC4,
    CODEC_ID_RPZA,
    CODEC_ID_CINEPAK,
    CODEC_ID_WS_VQA,
    CODEC_ID_MSRLE,
    CODEC_ID_MSVIDEO1,
    CODEC_ID_IDCIN,
    CODEC_ID_8BPS,
    CODEC_ID_SMC,
    CODEC_ID_FLIC,
    CODEC_ID_TRUEMOTION1,
    CODEC_ID_VMDVIDEO,
    CODEC_ID_MSZH,
    CODEC_ID_ZLIB,
    CODEC_ID_QTRLE,
    CODEC_ID_SNOW,
    CODEC_ID_TSCC,
    CODEC_ID_ULTI,
    CODEC_ID_QDRAW,
    CODEC_ID_VIXL,
    CODEC_ID_QPEG,
    CODEC_ID_PNG,
    CODEC_ID_PPM,
    CODEC_ID_PBM,
    CODEC_ID_PGM,
    CODEC_ID_PGMYUV,
    CODEC_ID_PAM,
    CODEC_ID_FFVHUFF,
    CODEC_ID_RV30,
    CODEC_ID_RV40,
    CODEC_ID_VC1,
    CODEC_ID_WMV3,
    CODEC_ID_LOCO,
    CODEC_ID_WNV1,
    CODEC_ID_AASC,
    CODEC_ID_INDEO2,
    CODEC_ID_FRAPS,
    CODEC_ID_TRUEMOTION2,
    CODEC_ID_BMP,
    CODEC_ID_CSCD,
    CODEC_ID_MMVIDEO,
    CODEC_ID_ZMBV,
    CODEC_ID_AVS,
    CODEC_ID_SMACKVIDEO,
    CODEC_ID_NUV,
    CODEC_ID_KMVC,
    CODEC_ID_FLASHSV,
    CODEC_ID_CAVS,
    CODEC_ID_JPEG2000,
    CODEC_ID_VMNC,
    CODEC_ID_VP5,
    CODEC_ID_VP6,
    CODEC_ID_VP6F,
    CODEC_ID_TARGA,
    CODEC_ID_DSICINVIDEO,
    CODEC_ID_TIERTEXSEQVIDEO,
    CODEC_ID_TIFF,
    CODEC_ID_GIF,
#if LIBAVCODEC_VERSION_MAJOR == 53
    CODEC_ID_FFH264,
#endif
    CODEC_ID_DXA,
    CODEC_ID_DNXHD,
    CODEC_ID_THP,
    CODEC_ID_SGI,
    CODEC_ID_C93,
    CODEC_ID_BETHSOFTVID,
    CODEC_ID_PTX,
    CODEC_ID_TXD,
    CODEC_ID_VP6A,
    CODEC_ID_AMV,
    CODEC_ID_VB,
    CODEC_ID_PCX,
    CODEC_ID_SUNRAST,
    CODEC_ID_INDEO4,
    CODEC_ID_INDEO5,
    CODEC_ID_MIMIC,
    CODEC_ID_RL2,
#if LIBAVCODEC_VERSION_MAJOR == 53
    CODEC_ID_8SVX_EXP,
    CODEC_ID_8SVX_FIB,
#endif
    CODEC_ID_ESCAPE124,
    CODEC_ID_DIRAC,
    CODEC_ID_BFI,
    CODEC_ID_CMV,
    CODEC_ID_MOTIONPIXELS,
    CODEC_ID_TGV,
    CODEC_ID_TGQ,
    CODEC_ID_TQI,
    CODEC_ID_AURA,
    CODEC_ID_AURA2,
    CODEC_ID_V210X,
    CODEC_ID_TMV,
    CODEC_ID_V210,
    CODEC_ID_DPX,
    CODEC_ID_MAD,
    CODEC_ID_FRWU,
    CODEC_ID_FLASHSV2,
    CODEC_ID_CDGRAPHICS,
    CODEC_ID_R210,
    CODEC_ID_ANM,
    CODEC_ID_BINKVIDEO,
    CODEC_ID_IFF_ILBM,
    CODEC_ID_IFF_BYTERUN1,
    CODEC_ID_KGV1,
    CODEC_ID_YOP,
    CODEC_ID_VP8,
    CODEC_ID_PICTOR,
    CODEC_ID_ANSI,
    CODEC_ID_A64_MULTI,
    CODEC_ID_A64_MULTI5,
    CODEC_ID_R10K,
    CODEC_ID_MXPEG,
    CODEC_ID_LAGARITH,
    CODEC_ID_PRORES,
    CODEC_ID_JV,
    CODEC_ID_DFA,
    CODEC_ID_WMV3IMAGE,
    CODEC_ID_VC1IMAGE,
#if LIBAVCODEC_VERSION_MAJOR == 53
    CODEC_ID_G723_1,
    CODEC_ID_G729,
#endif
    CODEC_ID_UTVIDEO,
    CODEC_ID_BMV_VIDEO,
    CODEC_ID_VBLE,
    CODEC_ID_DXTORY,

    /* various PCM "codecs" */
    CODEC_ID_FIRST_AUDIO = 0x10000, ///< A dummy id pointing at the start of audio codecs
    CODEC_ID_PCM_S16LE = 0x10000,
    CODEC_ID_PCM_S16BE,
    CODEC_ID_PCM_U16LE,
    CODEC_ID_PCM_U16BE,
    CODEC_ID_PCM_S8,
    CODEC_ID_PCM_U8,
    CODEC_ID_PCM_MULAW,
    CODEC_ID_PCM_ALAW,
    CODEC_ID_PCM_S32LE,
    CODEC_ID_PCM_S32BE,
    CODEC_ID_PCM_U32LE,
    CODEC_ID_PCM_U32BE,
    CODEC_ID_PCM_S24LE,
    CODEC_ID_PCM_S24BE,
    CODEC_ID_PCM_U24LE,
    CODEC_ID_PCM_U24BE,
    CODEC_ID_PCM_S24DAUD,
    CODEC_ID_PCM_ZORK,
    CODEC_ID_PCM_S16LE_PLANAR,
    CODEC_ID_PCM_DVD,
    CODEC_ID_PCM_F32BE,
    CODEC_ID_PCM_F32LE,
    CODEC_ID_PCM_F64BE,
    CODEC_ID_PCM_F64LE,
    CODEC_ID_PCM_BLURAY,
    CODEC_ID_PCM_LXF,
    CODEC_ID_S302M,
    CODEC_ID_PCM_S8_PLANAR,

    /* various ADPCM codecs */
    CODEC_ID_ADPCM_IMA_QT = 0x11000,
    CODEC_ID_ADPCM_IMA_WAV,
    CODEC_ID_ADPCM_IMA_DK3,
    CODEC_ID_ADPCM_IMA_DK4,
    CODEC_ID_ADPCM_IMA_WS,
    CODEC_ID_ADPCM_IMA_SMJPEG,
    CODEC_ID_ADPCM_MS,
    CODEC_ID_ADPCM_4XM,
    CODEC_ID_ADPCM_XA,
    CODEC_ID_ADPCM_ADX,
    CODEC_ID_ADPCM_EA,
    CODEC_ID_ADPCM_G726,
    CODEC_ID_ADPCM_CT,
    CODEC_ID_ADPCM_SWF,
    CODEC_ID_ADPCM_YAMAHA,
    CODEC_ID_ADPCM_SBPRO_4,
    CODEC_ID_ADPCM_SBPRO_3,
    CODEC_ID_ADPCM_SBPRO_2,
    CODEC_ID_ADPCM_THP,
    CODEC_ID_ADPCM_IMA_AMV,
    CODEC_ID_ADPCM_EA_R1,
    CODEC_ID_ADPCM_EA_R3,
    CODEC_ID_ADPCM_EA_R2,
    CODEC_ID_ADPCM_IMA_EA_SEAD,
    CODEC_ID_ADPCM_IMA_EA_EACS,
    CODEC_ID_ADPCM_EA_XAS,
    CODEC_ID_ADPCM_EA_MAXIS_XA,
    CODEC_ID_ADPCM_IMA_ISS,
    CODEC_ID_ADPCM_G722,

    /* AMR */
    CODEC_ID_AMR_NB = 0x12000,
    CODEC_ID_AMR_WB,

    /* RealAudio codecs*/
    CODEC_ID_RA_144 = 0x13000,
    CODEC_ID_RA_288,

    /* various DPCM codecs */
    CODEC_ID_ROQ_DPCM = 0x14000,
    CODEC_ID_INTERPLAY_DPCM,
    CODEC_ID_XAN_DPCM,
    CODEC_ID_SOL_DPCM,

    /* audio codecs */
    CODEC_ID_MP2 = 0x15000,
    CODEC_ID_MP3, ///< preferred ID for decoding MPEG audio layer 1, 2 or 3
    CODEC_ID_AAC,
    CODEC_ID_AC3,
    CODEC_ID_DTS,
    CODEC_ID_VORBIS,
    CODEC_ID_DVAUDIO,
    CODEC_ID_WMAV1,
    CODEC_ID_WMAV2,
    CODEC_ID_MACE3,
    CODEC_ID_MACE6,
    CODEC_ID_VMDAUDIO,
#if LIBAVCODEC_VERSION_MAJOR == 53
    CODEC_ID_SONIC,
    CODEC_ID_SONIC_LS,
#endif
    CODEC_ID_FLAC,
    CODEC_ID_MP3ADU,
    CODEC_ID_MP3ON4,
    CODEC_ID_SHORTEN,
    CODEC_ID_ALAC,
    CODEC_ID_WESTWOOD_SND1,
    CODEC_ID_GSM, ///< as in Berlin toast format
    CODEC_ID_QDM2,
    CODEC_ID_COOK,
    CODEC_ID_TRUESPEECH,
    CODEC_ID_TTA,
    CODEC_ID_SMACKAUDIO,
    CODEC_ID_QCELP,
    CODEC_ID_WAVPACK,
    CODEC_ID_DSICINAUDIO,
    CODEC_ID_IMC,
    CODEC_ID_MUSEPACK7,
    CODEC_ID_MLP,
    CODEC_ID_GSM_MS, /* as found in WAV */
    CODEC_ID_ATRAC3,
    CODEC_ID_VOXWARE,
    CODEC_ID_APE,
    CODEC_ID_NELLYMOSER,
    CODEC_ID_MUSEPACK8,
    CODEC_ID_SPEEX,
    CODEC_ID_WMAVOICE,
    CODEC_ID_WMAPRO,
    CODEC_ID_WMALOSSLESS,
    CODEC_ID_ATRAC3P,
    CODEC_ID_EAC3,
    CODEC_ID_SIPR,
    CODEC_ID_MP1,
    CODEC_ID_TWINVQ,
    CODEC_ID_TRUEHD,
    CODEC_ID_MP4ALS,
    CODEC_ID_ATRAC1,
    CODEC_ID_BINKAUDIO_RDFT,
    CODEC_ID_BINKAUDIO_DCT,
    CODEC_ID_AAC_LATM,
    CODEC_ID_QDMC,
    CODEC_ID_CELT,
#if LIBAVCODEC_VERSION_MAJOR > 53
    CODEC_ID_G723_1,
    CODEC_ID_G729,
    CODEC_ID_8SVX_EXP,
    CODEC_ID_8SVX_FIB,
#endif
    CODEC_ID_BMV_AUDIO,

    /* subtitle codecs */
    CODEC_ID_FIRST_SUBTITLE = 0x17000, ///< A dummy ID pointing at the start of subtitle codecs.
    CODEC_ID_DVD_SUBTITLE = 0x17000,
    CODEC_ID_DVB_SUBTITLE,
    CODEC_ID_TEXT, ///< raw UTF-8 text
    CODEC_ID_XSUB,
    CODEC_ID_SSA,
    CODEC_ID_MOV_TEXT,
    CODEC_ID_HDMV_PGS_SUBTITLE,
    CODEC_ID_DVB_TELETEXT,
    CODEC_ID_SRT,

    /* other specific kind of codecs (generally used for attachments) */
    CODEC_ID_FIRST_UNKNOWN = 0x18000, ///< A dummy ID pointing at the start of various fake codecs.
    CODEC_ID_TTF = 0x18000,

    CODEC_ID_PROBE = 0x19000, ///< codec_id is not known (like CODEC_ID_NONE) but lavf should attempt to identify it

    CODEC_ID_MPEG2TS = 0x20000, /**< _FAKE_ codec to indicate a raw MPEG-2 TS
* stream (only used by libavformat) */
    CODEC_ID_MPEG4SYSTEMS = 0x20001, /**< _FAKE_ codec to indicate a MPEG-4 Systems
* stream (only used by libavformat) */
    CODEC_ID_FFMETADATA = 0x21000, ///< Dummy codec for streams containing only metadata information.
};

#if FF_API_OLD_SAMPLE_FMT
#define SampleFormat AVSampleFormat

#define SAMPLE_FMT_NONE AV_SAMPLE_FMT_NONE
#define SAMPLE_FMT_U8 AV_SAMPLE_FMT_U8
#define SAMPLE_FMT_S16 AV_SAMPLE_FMT_S16
#define SAMPLE_FMT_S32 AV_SAMPLE_FMT_S32
#define SAMPLE_FMT_FLT AV_SAMPLE_FMT_FLT
#define SAMPLE_FMT_DBL AV_SAMPLE_FMT_DBL
#define SAMPLE_FMT_NB AV_SAMPLE_FMT_NB
#endif

#if FF_API_OLD_AUDIOCONVERT
#include "libavutil/audioconvert.h"

/* Audio channel masks */
#define CH_FRONT_LEFT AV_CH_FRONT_LEFT
#define CH_FRONT_RIGHT AV_CH_FRONT_RIGHT
#define CH_FRONT_CENTER AV_CH_FRONT_CENTER
#define CH_LOW_FREQUENCY AV_CH_LOW_FREQUENCY
#define CH_BACK_LEFT AV_CH_BACK_LEFT
#define CH_BACK_RIGHT AV_CH_BACK_RIGHT
#define CH_FRONT_LEFT_OF_CENTER AV_CH_FRONT_LEFT_OF_CENTER
#define CH_FRONT_RIGHT_OF_CENTER AV_CH_FRONT_RIGHT_OF_CENTER
#define CH_BACK_CENTER AV_CH_BACK_CENTER
#define CH_SIDE_LEFT AV_CH_SIDE_LEFT
#define CH_SIDE_RIGHT AV_CH_SIDE_RIGHT
#define CH_TOP_CENTER AV_CH_TOP_CENTER
#define CH_TOP_FRONT_LEFT AV_CH_TOP_FRONT_LEFT
#define CH_TOP_FRONT_CENTER AV_CH_TOP_FRONT_CENTER
#define CH_TOP_FRONT_RIGHT AV_CH_TOP_FRONT_RIGHT
#define CH_TOP_BACK_LEFT AV_CH_TOP_BACK_LEFT
#define CH_TOP_BACK_CENTER AV_CH_TOP_BACK_CENTER
#define CH_TOP_BACK_RIGHT AV_CH_TOP_BACK_RIGHT
#define CH_STEREO_LEFT AV_CH_STEREO_LEFT
#define CH_STEREO_RIGHT AV_CH_STEREO_RIGHT

/** Channel mask value used for AVCodecContext.request_channel_layout
to indicate that the user requests the channel order of the decoder output
to be the native codec channel order. */
#define CH_LAYOUT_NATIVE AV_CH_LAYOUT_NATIVE

/* Audio channel convenience macros */
#define CH_LAYOUT_MONO AV_CH_LAYOUT_MONO
#define CH_LAYOUT_STEREO AV_CH_LAYOUT_STEREO
#define CH_LAYOUT_2_1 AV_CH_LAYOUT_2_1
#define CH_LAYOUT_SURROUND AV_CH_LAYOUT_SURROUND
#define CH_LAYOUT_4POINT0 AV_CH_LAYOUT_4POINT0
#define CH_LAYOUT_2_2 AV_CH_LAYOUT_2_2
#define CH_LAYOUT_QUAD AV_CH_LAYOUT_QUAD
#define CH_LAYOUT_5POINT0 AV_CH_LAYOUT_5POINT0
#define CH_LAYOUT_5POINT1 AV_CH_LAYOUT_5POINT1
#define CH_LAYOUT_5POINT0_BACK AV_CH_LAYOUT_5POINT0_BACK
#define CH_LAYOUT_5POINT1_BACK AV_CH_LAYOUT_5POINT1_BACK
#define CH_LAYOUT_7POINT0 AV_CH_LAYOUT_7POINT0
#define CH_LAYOUT_7POINT1 AV_CH_LAYOUT_7POINT1
#define CH_LAYOUT_7POINT1_WIDE AV_CH_LAYOUT_7POINT1_WIDE
#define CH_LAYOUT_STEREO_DOWNMIX AV_CH_LAYOUT_STEREO_DOWNMIX
#endif

#if FF_API_OLD_DECODE_AUDIO
/* in bytes */
#define AVCODEC_MAX_AUDIO_FRAME_SIZE 192000 // 1 second of 48khz 32bit audio
#endif

/**
* Required number of additionally allocated bytes at the end of the input bitstream for decoding.
* This is mainly needed because some optimized bitstream readers read
* 32 or 64 bit at once and could read over the end.<br>
* Note: If the first 23 bits of the additional bytes are not 0, then damaged
* MPEG bitstreams could cause overread and segfault.
*/
#define FF_INPUT_BUFFER_PADDING_SIZE 8

/**
* minimum encoding buffer size
* Used to avoid some checks during header writing.
*/
#define FF_MIN_BUFFER_SIZE 16384


/**
* motion estimation type.
*/
enum Motion_Est_ID {
    ME_ZERO = 1, ///< no search, that is use 0,0 vector whenever one is needed
    ME_FULL,
    ME_LOG,
    ME_PHODS,
    ME_EPZS, ///< enhanced predictive zonal search
    ME_X1, ///< reserved for experiments
    ME_HEX, ///< hexagon based search
    ME_UMH, ///< uneven multi-hexagon search
    ME_ITER, ///< iterative search
    ME_TESA, ///< transformed exhaustive search algorithm
};

enum AVDiscard{
    /* We leave some space between them for extensions (drop some
* keyframes for intra-only or drop just some bidir frames). */
    AVDISCARD_NONE =-16, ///< discard nothing
    AVDISCARD_DEFAULT= 0, ///< discard useless packets like 0 size packets in avi
    AVDISCARD_NONREF = 8, ///< discard all non reference
    AVDISCARD_BIDIR = 16, ///< discard all bidirectional frames
    AVDISCARD_NONKEY = 32, ///< discard all frames except keyframes
    AVDISCARD_ALL = 48, ///< discard all
};

enum AVColorPrimaries{
    AVCOL_PRI_BT709 =1, ///< also ITU-R BT1361 / IEC 61966-2-4 / SMPTE RP177 Annex B
    AVCOL_PRI_UNSPECIFIED=2,
    AVCOL_PRI_BT470M =4,
    AVCOL_PRI_BT470BG =5, ///< also ITU-R BT601-6 625 / ITU-R BT1358 625 / ITU-R BT1700 625 PAL & SECAM
    AVCOL_PRI_SMPTE170M =6, ///< also ITU-R BT601-6 525 / ITU-R BT1358 525 / ITU-R BT1700 NTSC
    AVCOL_PRI_SMPTE240M =7, ///< functionally identical to above
    AVCOL_PRI_FILM =8,
    AVCOL_PRI_NB , ///< Not part of ABI
};

enum AVColorTransferCharacteristic{
    AVCOL_TRC_BT709 =1, ///< also ITU-R BT1361
    AVCOL_TRC_UNSPECIFIED=2,
    AVCOL_TRC_GAMMA22 =4, ///< also ITU-R BT470M / ITU-R BT1700 625 PAL & SECAM
    AVCOL_TRC_GAMMA28 =5, ///< also ITU-R BT470BG
    AVCOL_TRC_NB , ///< Not part of ABI
};

enum AVColorSpace{
    AVCOL_SPC_RGB =0,
    AVCOL_SPC_BT709 =1, ///< also ITU-R BT1361 / IEC 61966-2-4 xvYCC709 / SMPTE RP177 Annex B
    AVCOL_SPC_UNSPECIFIED=2,
    AVCOL_SPC_FCC =4,
    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
    AVCOL_SPC_SMPTE170M =6, ///< also ITU-R BT601-6 525 / ITU-R BT1358 525 / ITU-R BT1700 NTSC / functionally identical to above
    AVCOL_SPC_SMPTE240M =7,
    AVCOL_SPC_NB , ///< Not part of ABI
};

enum AVColorRange{
    AVCOL_RANGE_UNSPECIFIED=0,
    AVCOL_RANGE_MPEG =1, ///< the normal 219*2^(n-8) "MPEG" YUV ranges
    AVCOL_RANGE_JPEG =2, ///< the normal 2^n-1 "JPEG" YUV ranges
    AVCOL_RANGE_NB , ///< Not part of ABI
};

/**
* X X 3 4 X X are luma samples,
* 1 2 1-6 are possible chroma positions
* X X 5 6 X 0 is undefined/unknown position
*/
enum AVChromaLocation{
    AVCHROMA_LOC_UNSPECIFIED=0,
    AVCHROMA_LOC_LEFT =1, ///< mpeg2/4, h264 default
    AVCHROMA_LOC_CENTER =2, ///< mpeg1, jpeg, h263
    AVCHROMA_LOC_TOPLEFT =3, ///< DV
    AVCHROMA_LOC_TOP =4,
    AVCHROMA_LOC_BOTTOMLEFT =5,
    AVCHROMA_LOC_BOTTOM =6,
    AVCHROMA_LOC_NB , ///< Not part of ABI
};

#if FF_API_FLAC_GLOBAL_OPTS
/**
* LPC analysis type
*/
enum AVLPCType {
    AV_LPC_TYPE_DEFAULT = -1, ///< use the codec default LPC type
    AV_LPC_TYPE_NONE = 0, ///< do not use LPC prediction or use all zero coefficients
    AV_LPC_TYPE_FIXED = 1, ///< fixed LPC coefficients
    AV_LPC_TYPE_LEVINSON = 2, ///< Levinson-Durbin recursion
    AV_LPC_TYPE_CHOLESKY = 3, ///< Cholesky factorization
    AV_LPC_TYPE_NB , ///< Not part of ABI
};
#endif

enum AVAudioServiceType {
    AV_AUDIO_SERVICE_TYPE_MAIN = 0,
    AV_AUDIO_SERVICE_TYPE_EFFECTS = 1,
    AV_AUDIO_SERVICE_TYPE_VISUALLY_IMPAIRED = 2,
    AV_AUDIO_SERVICE_TYPE_HEARING_IMPAIRED = 3,
    AV_AUDIO_SERVICE_TYPE_DIALOGUE = 4,
    AV_AUDIO_SERVICE_TYPE_COMMENTARY = 5,
    AV_AUDIO_SERVICE_TYPE_EMERGENCY = 6,
    AV_AUDIO_SERVICE_TYPE_VOICE_OVER = 7,
    AV_AUDIO_SERVICE_TYPE_KARAOKE = 8,
    AV_AUDIO_SERVICE_TYPE_NB , ///< Not part of ABI
};

typedef struct RcOverride{
    int start_frame;
    int end_frame;
    int qscale; // If this is 0 then quality_factor will be used instead.
    float quality_factor;
} RcOverride;

#define FF_MAX_B_FRAMES 16

/* encoding support
These flags can be passed in AVCodecContext.flags before initialization.
Note: Not everything is supported yet.
*/

#define CODEC_FLAG_QSCALE 0x0002 ///< Use fixed qscale.
#define CODEC_FLAG_4MV 0x0004 ///< 4 MV per MB allowed / advanced prediction for H.263.
#define CODEC_FLAG_QPEL 0x0010 ///< Use qpel MC.
#define CODEC_FLAG_GMC 0x0020 ///< Use GMC.
#define CODEC_FLAG_MV0 0x0040 ///< Always try a MB with MV=<0,0>.
/**
* The parent program guarantees that the input for B-frames containing
* streams is not written to for at least s->max_b_frames+1 frames, if
* this is not set the input will be copied.
*/
#define CODEC_FLAG_INPUT_PRESERVED 0x0100
#define CODEC_FLAG_PASS1 0x0200 ///< Use internal 2pass ratecontrol in first pass mode.
#define CODEC_FLAG_PASS2 0x0400 ///< Use internal 2pass ratecontrol in second pass mode.
#define CODEC_FLAG_GRAY 0x2000 ///< Only decode/encode grayscale.
#define CODEC_FLAG_EMU_EDGE 0x4000 ///< Don't draw edges.
#define CODEC_FLAG_PSNR 0x8000 ///< error[?] variables will be set during encoding.
#define CODEC_FLAG_TRUNCATED 0x00010000 /** Input bitstream might be truncated at a random
location instead of only at frame boundaries. */
#define CODEC_FLAG_NORMALIZE_AQP 0x00020000 ///< Normalize adaptive quantization.
#define CODEC_FLAG_INTERLACED_DCT 0x00040000 ///< Use interlaced DCT.
#define CODEC_FLAG_LOW_DELAY 0x00080000 ///< Force low delay.
#define CODEC_FLAG_GLOBAL_HEADER 0x00400000 ///< Place global headers in extradata instead of every keyframe.
#define CODEC_FLAG_BITEXACT 0x00800000 ///< Use only bitexact stuff (except (I)DCT).
/* Fx : Flag for h263+ extra options */
#define CODEC_FLAG_AC_PRED 0x01000000 ///< H.263 advanced intra coding / MPEG-4 AC prediction
#define CODEC_FLAG_CBP_RD 0x04000000 ///< Use rate distortion optimization for cbp.
#define CODEC_FLAG_QP_RD 0x08000000 ///< Use rate distortion optimization for qp selectioon.
#define CODEC_FLAG_LOOP_FILTER 0x00000800 ///< loop filter
#define CODEC_FLAG_INTERLACED_ME 0x20000000 ///< interlaced motion estimation
#define CODEC_FLAG_CLOSED_GOP 0x80000000
#define CODEC_FLAG2_FAST 0x00000001 ///< Allow non spec compliant speedup tricks.
#define CODEC_FLAG2_STRICT_GOP 0x00000002 ///< Strictly enforce GOP size.
#define CODEC_FLAG2_NO_OUTPUT 0x00000004 ///< Skip bitstream encoding.
#define CODEC_FLAG2_LOCAL_HEADER 0x00000008 ///< Place global headers at every keyframe instead of in extradata.
#define CODEC_FLAG2_SKIP_RD 0x00004000 ///< RD optimal MB level residual skipping
#define CODEC_FLAG2_CHUNKS 0x00008000 ///< Input bitstream might be truncated at a packet boundaries instead of only at frame boundaries.
/**
* @defgroup deprecated_flags Deprecated codec flags
* Use corresponding private codec options instead.
* @{
*/
#if FF_API_MPEGVIDEO_GLOBAL_OPTS
#define CODEC_FLAG_OBMC 0x00000001 ///< OBMC
#define CODEC_FLAG_H263P_AIV 0x00000008 ///< H.263 alternative inter VLC
#define CODEC_FLAG_PART 0x0080 ///< Use data partitioning.
#define CODEC_FLAG_ALT_SCAN 0x00100000 ///< Use alternate scan.
#define CODEC_FLAG_H263P_UMV 0x02000000 ///< unlimited motion vector
#define CODEC_FLAG_H263P_SLICE_STRUCT 0x10000000
#define CODEC_FLAG_SVCD_SCAN_OFFSET 0x40000000 ///< Will reserve space for SVCD scan offset user data.
#define CODEC_FLAG2_INTRA_VLC 0x00000800 ///< Use MPEG-2 intra VLC table.
#define CODEC_FLAG2_DROP_FRAME_TIMECODE 0x00002000 ///< timecode is in drop frame format.
#define CODEC_FLAG2_NON_LINEAR_QUANT 0x00010000 ///< Use MPEG-2 nonlinear quantizer.
#endif
#if FF_API_MJPEG_GLOBAL_OPTS
#define CODEC_FLAG_EXTERN_HUFF 0x1000 ///< Use external Huffman table (for MJPEG).
#endif
#if FF_API_X264_GLOBAL_OPTS
#define CODEC_FLAG2_BPYRAMID 0x00000010 ///< H.264 allow B-frames to be used as references.
#define CODEC_FLAG2_WPRED 0x00000020 ///< H.264 weighted biprediction for B-frames
#define CODEC_FLAG2_MIXED_REFS 0x00000040 ///< H.264 one reference per partition, as opposed to one reference per macroblock
#define CODEC_FLAG2_8X8DCT 0x00000080 ///< H.264 high profile 8x8 transform
#define CODEC_FLAG2_FASTPSKIP 0x00000100 ///< H.264 fast pskip
#define CODEC_FLAG2_AUD 0x00000200 ///< H.264 access unit delimiters
#define CODEC_FLAG2_BRDO 0x00000400 ///< B-frame rate-distortion optimization
#define CODEC_FLAG2_MBTREE 0x00040000 ///< Use macroblock tree ratecontrol (x264 only)
#define CODEC_FLAG2_PSY 0x00080000 ///< Use psycho visual optimizations.
#define CODEC_FLAG2_SSIM 0x00100000 ///< Compute SSIM during encoding, error[] values are undefined.
#define CODEC_FLAG2_INTRA_REFRESH 0x00200000 ///< Use periodic insertion of intra blocks instead of keyframes.
#endif
#if FF_API_SNOW_GLOBAL_OPTS
#define CODEC_FLAG2_MEMC_ONLY 0x00001000 ///< Only do ME/MC (I frames -> ref, P frame -> ME+MC).
#endif
#if FF_API_LAME_GLOBAL_OPTS
#define CODEC_FLAG2_BIT_RESERVOIR 0x00020000 ///< Use a bit reservoir when encoding if possible
#endif
/**
* @}
*/

/* Unsupported options :
* Syntax Arithmetic coding (SAC)
* Reference Picture Selection
* Independent Segment Decoding */
/* /Fx */
/* codec capabilities */

#define CODEC_CAP_DRAW_HORIZ_BAND 0x0001 ///< Decoder can use draw_horiz_band callback.
/**
* Codec uses get_buffer() for allocating buffers and supports custom allocators.
* If not set, it might not use get_buffer() at all or use operations that
* assume the buffer was allocated by avcodec_default_get_buffer.
*/
#define CODEC_CAP_DR1 0x0002
#if FF_API_PARSE_FRAME
/* If 'parse_only' field is true, then avcodec_parse_frame() can be used. */
#define CODEC_CAP_PARSE_ONLY 0x0004
#endif
#define CODEC_CAP_TRUNCATED 0x0008
/* Codec can export data for HW decoding (XvMC). */
#define CODEC_CAP_HWACCEL 0x0010
/**
* Codec has a nonzero delay and needs to be fed with avpkt->data=NULL,
* avpkt->size=0 at the end to get the delayed data until the decoder no longer
* returns frames. If this is not set, the codec is guaranteed to never be fed
* with NULL data.
*/
#define CODEC_CAP_DELAY 0x0020
/**
* Codec can be fed a final frame with a smaller size.
* This can be used to prevent truncation of the last audio samples.
*/
#define CODEC_CAP_SMALL_LAST_FRAME 0x0040
/**
* Codec can export data for HW decoding (VDPAU).
*/
#define CODEC_CAP_HWACCEL_VDPAU 0x0080
/**
* Codec can output multiple frames per AVPacket
* Normally demuxers return one frame at a time, demuxers which do not do
* are connected to a parser to split what they return into proper frames.
* This flag is reserved to the very rare category of codecs which have a
* bitstream that cannot be split into frames without timeconsuming
* operations like full decoding. Demuxers carring such bitstreams thus
* may return multiple frames in a packet. This has many disadvantages like
* prohibiting stream copy in many cases thus it should only be considered
* as a last resort.
*/
#define CODEC_CAP_SUBFRAMES 0x0100
/**
* Codec is experimental and is thus avoided in favor of non experimental
* encoders
*/
#define CODEC_CAP_EXPERIMENTAL 0x0200
/**
* Codec should fill in channel configuration and samplerate instead of container
*/
#define CODEC_CAP_CHANNEL_CONF 0x0400
/**
* Codec is able to deal with negative linesizes
*/
#define CODEC_CAP_NEG_LINESIZES 0x0800
/**
* Codec supports frame-level multithreading.
*/
#define CODEC_CAP_FRAME_THREADS 0x1000
/**
* Codec supports slice-based (or partition-based) multithreading.
*/
#define CODEC_CAP_SLICE_THREADS 0x2000

//The following defines may change, don't expect compatibility if you use them.
#define MB_TYPE_INTRA4x4 0x0001
#define MB_TYPE_INTRA16x16 0x0002 //FIXME H.264-specific
#define MB_TYPE_INTRA_PCM 0x0004 //FIXME H.264-specific
#define MB_TYPE_16x16 0x0008
#define MB_TYPE_16x8 0x0010
#define MB_TYPE_8x16 0x0020
#define MB_TYPE_8x8 0x0040
#define MB_TYPE_INTERLACED 0x0080
#define MB_TYPE_DIRECT2 0x0100 //FIXME
#define MB_TYPE_ACPRED 0x0200
#define MB_TYPE_GMC 0x0400
#define MB_TYPE_SKIP 0x0800
#define MB_TYPE_P0L0 0x1000
#define MB_TYPE_P1L0 0x2000
#define MB_TYPE_P0L1 0x4000
#define MB_TYPE_P1L1 0x8000
#define MB_TYPE_L0 (MB_TYPE_P0L0 | MB_TYPE_P1L0)
#define MB_TYPE_L1 (MB_TYPE_P0L1 | MB_TYPE_P1L1)
#define MB_TYPE_L0L1 (MB_TYPE_L0 | MB_TYPE_L1)
#define MB_TYPE_QUANT 0x00010000
#define MB_TYPE_CBP 0x00020000
//Note bits 24-31 are reserved for codec specific use (h264 ref0, mpeg1 0mv, ...)

/**
* Pan Scan area.
* This specifies the area which should be displayed.
* Note there may be multiple such areas for one frame.
*/
typedef struct AVPanScan{
    /**
* id
* - encoding: Set by user.
* - decoding: Set by libavcodec.
*/
    int id;

    /**
* width and height in 1/16 pel
* - encoding: Set by user.
* - decoding: Set by libavcodec.
*/
    int width;
    int height;

    /**
* position of the top left corner in 1/16 pel for up to 3 fields/frames
* - encoding: Set by user.
* - decoding: Set by libavcodec.
*/
    int16_t position[3][2];
}AVPanScan;

#define FF_QSCALE_TYPE_MPEG1 0
#define FF_QSCALE_TYPE_MPEG2 1
#define FF_QSCALE_TYPE_H264 2
#define FF_QSCALE_TYPE_VP56 3

#define FF_BUFFER_TYPE_INTERNAL 1
#define FF_BUFFER_TYPE_USER 2 ///< direct rendering buffers (image is (de)allocated by user)
#define FF_BUFFER_TYPE_SHARED 4 ///< Buffer from somewhere else; don't deallocate image (data/base), all other tables are not shared.
#define FF_BUFFER_TYPE_COPY 8 ///< Just a (modified) copy of some other buffer, don't deallocate anything.

#if FF_API_OLD_FF_PICT_TYPES
/* DEPRECATED, directly use the AV_PICTURE_TYPE_* enum values */
#define FF_I_TYPE AV_PICTURE_TYPE_I ///< Intra
#define FF_P_TYPE AV_PICTURE_TYPE_P ///< Predicted
#define FF_B_TYPE AV_PICTURE_TYPE_B ///< Bi-dir predicted
#define FF_S_TYPE AV_PICTURE_TYPE_S ///< S(GMC)-VOP MPEG4
#define FF_SI_TYPE AV_PICTURE_TYPE_SI ///< Switching Intra
#define FF_SP_TYPE AV_PICTURE_TYPE_SP ///< Switching Predicted
#define FF_BI_TYPE AV_PICTURE_TYPE_BI
#endif

#define FF_BUFFER_HINTS_VALID 0x01 // Buffer hints value is meaningful (if 0 ignore).
#define FF_BUFFER_HINTS_READABLE 0x02 // Codec will read from buffer.
#define FF_BUFFER_HINTS_PRESERVE 0x04 // User must not alter buffer content.
#define FF_BUFFER_HINTS_REUSABLE 0x08 // Codec will reuse the buffer (update).

enum AVPacketSideDataType {
    AV_PKT_DATA_PALETTE,
};

typedef struct AVPacket {
    /**
* Presentation timestamp in AVStream->time_base units; the time at which
* the decompressed packet will be presented to the user.
* Can be AV_NOPTS_VALUE if it is not stored in the file.
* pts MUST be larger or equal to dts as presentation cannot happen before
* decompression, unless one wants to view hex dumps. Some formats misuse
* the terms dts and pts/cts to mean something different. Such timestamps
* must be converted to true pts/dts before they are stored in AVPacket.
*/
    int64_t pts;
    /**
* Decompression timestamp in AVStream->time_base units; the time at which
* the packet is decompressed.
* Can be AV_NOPTS_VALUE if it is not stored in the file.
*/
    int64_t dts;
    uint8_t *data;
    int size;
    int stream_index;
    /**
* A combination of AV_PKT_FLAG values
*/
    int flags;
    /**
* Additional packet data that can be provided by the container.
* Packet can contain several types of side information.
*/
    struct {
        uint8_t *data;
        int size;
        enum AVPacketSideDataType type;
    } *side_data;
    int side_data_elems;

    /**
* Duration of this packet in AVStream->time_base units, 0 if unknown.
* Equals next_pts - this_pts in presentation order.
*/
    int duration;
    void (*destruct)(struct AVPacket *);
    void *priv;
    int64_t pos; ///< byte position in stream, -1 if unknown

    /**
* Time difference in AVStream->time_base units from the pts of this
* packet to the point at which the output from the decoder has converged
* independent from the availability of previous frames. That is, the
* frames are virtually identical no matter if decoding started from
* the very first frame or from this keyframe.
* Is AV_NOPTS_VALUE if unknown.
* This field is not the display duration of the current packet.
* This field has no meaning if the packet does not have AV_PKT_FLAG_KEY
* set.
*
* The purpose of this field is to allow seeking in streams that have no
* keyframes in the conventional sense. It corresponds to the
* recovery point SEI in H.264 and match_time_delta in NUT. It is also
* essential for some types of subtitle streams to ensure that all
* subtitles are correctly displayed after seeking.
*/
    int64_t convergence_duration;
} AVPacket;
#define AV_PKT_FLAG_KEY 0x0001 ///< The packet contains a keyframe
#define AV_PKT_FLAG_CORRUPT 0x0002 ///< The packet content is corrupted

/**
* Audio Video Frame.
* New fields can be added to the end of AVFRAME with minor version
* bumps. Removal, reordering and changes to existing fields require
* a major version bump.
* sizeof(AVFrame) must not be used outside libav*.
*/
typedef struct AVFrame {
#if FF_API_DATA_POINTERS
#define AV_NUM_DATA_POINTERS 4
#else
#define AV_NUM_DATA_POINTERS 8
#endif
    /**
* pointer to the picture/channel planes.
* This might be different from the first allocated byte
* - encoding: Set by user
* - decoding: set by AVCodecContext.get_buffer()
*/
    uint8_t *data[AV_NUM_DATA_POINTERS];

    /**
* Size, in bytes, of the data for each picture/channel plane.
*
* For audio, only linesize[0] may be set. For planar audio, each channel
* plane must be the same size.
*
* - encoding: Set by user (video only)
* - decoding: set by AVCodecContext.get_buffer()
*/
    int linesize[AV_NUM_DATA_POINTERS];

    /**
* pointer to the first allocated byte of the picture. Can be used in get_buffer/release_buffer.
* This isn't used by libavcodec unless the default get/release_buffer() is used.
* - encoding:
* - decoding:
*/
    uint8_t *base[AV_NUM_DATA_POINTERS];
    /**
* 1 -> keyframe, 0-> not
* - encoding: Set by libavcodec.
* - decoding: Set by libavcodec.
*/
    int key_frame;

    /**
* Picture type of the frame, see ?_TYPE below.
* - encoding: Set by libavcodec. for coded_picture (and set by user for input).
* - decoding: Set by libavcodec.
*/
    enum AVPictureType pict_type;

    /**
* presentation timestamp in time_base units (time when frame should be shown to user)
* If AV_NOPTS_VALUE then frame_rate = 1/time_base will be assumed.
* - encoding: MUST be set by user.
* - decoding: Set by libavcodec.
*/
    int64_t pts;

    /**
* picture number in bitstream order
* - encoding: set by
* - decoding: Set by libavcodec.
*/
    int coded_picture_number;
    /**
* picture number in display order
* - encoding: set by
* - decoding: Set by libavcodec.
*/
    int display_picture_number;

    /**
* quality (between 1 (good) and FF_LAMBDA_MAX (bad))
* - encoding: Set by libavcodec. for coded_picture (and set by user for input).
* - decoding: Set by libavcodec.
*/
    int quality;

    /**
* buffer age (1->was last buffer and dint change, 2->..., ...).
* Set to INT_MAX if the buffer has not been used yet.
* - encoding: unused
* - decoding: MUST be set by get_buffer() for video.
*/
    int age;

    /**
* is this picture used as reference
* The values for this are the same as the MpegEncContext.picture_structure
* variable, that is 1->top field, 2->bottom field, 3->frame/both fields.
* Set to 4 for delayed, non-reference frames.
* - encoding: unused
* - decoding: Set by libavcodec. (before get_buffer() call)).
*/
    int reference;

    /**
* QP table
* - encoding: unused
* - decoding: Set by libavcodec.
*/
    int8_t *qscale_table;
    /**
* QP store stride
* - encoding: unused
* - decoding: Set by libavcodec.
*/
    int qstride;

    /**
* mbskip_table[mb]>=1 if MB didn't change
* stride= mb_width = (width+15)>>4
* - encoding: unused
* - decoding: Set by libavcodec.
*/
    uint8_t *mbskip_table;

    /**
* motion vector table
* @code
* example:
* int mv_sample_log2= 4 - motion_subsample_log2;
* int mb_width= (width+15)>>4;
* int mv_stride= (mb_width << mv_sample_log2) + 1;
* motion_val[direction][x + y*mv_stride][0->mv_x, 1->mv_y];
* @endcode
* - encoding: Set by user.
* - decoding: Set by libavcodec.
*/
    int16_t (*motion_val[2])[2];

    /**
* macroblock type table
* mb_type_base + mb_width + 2
* - encoding: Set by user.
* - decoding: Set by libavcodec.
*/
    uint32_t *mb_type;

    /**
* log2 of the size of the block which a single vector in motion_val represents:
* (4->16x16, 3->8x8, 2-> 4x4, 1-> 2x2)
* - encoding: unused
* - decoding: Set by libavcodec.
*/
    uint8_t motion_subsample_log2;

    /**
* for some private data of the user
* - encoding: unused
* - decoding: Set by user.
*/
    void *opaque;

    /**
* error
* - encoding: Set by libavcodec. if flags&CODEC_FLAG_PSNR.
* - decoding: unused
*/
    uint64_t error[AV_NUM_DATA_POINTERS];

    /**
* type of the buffer (to keep track of who has to deallocate data[*])
* - encoding: Set by the one who allocates it.
* - decoding: Set by the one who allocates it.
* Note: User allocated (direct rendering) & internal buffers cannot coexist currently.
*/
    int type;

    /**
* When decoding, this signals how much the picture must be delayed.
* extra_delay = repeat_pict / (2*fps)
* - encoding: unused
* - decoding: Set by libavcodec.
*/
    int repeat_pict;

    /**
*
*/
    int qscale_type;

    /**
* The content of the picture is interlaced.
* - encoding: Set by user.
* - decoding: Set by libavcodec. (default 0)
*/
    int interlaced_frame;

    /**
* If the content is interlaced, is top field displayed first.
* - encoding: Set by user.
* - decoding: Set by libavcodec.
*/
    int top_field_first;

    /**
* Pan scan.
* - encoding: Set by user.
* - decoding: Set by libavcodec.
*/
    AVPanScan *pan_scan;

    /**
* Tell user application that palette has changed from previous frame.
* - encoding: ??? (no palette-enabled encoder yet)
* - decoding: Set by libavcodec. (default 0).
*/
    int palette_has_changed;

    /**
* codec suggestion on buffer type if != 0
* - encoding: unused
* - decoding: Set by libavcodec. (before get_buffer() call)).
*/
    int buffer_hints;

    /**
* DCT coefficients
* - encoding: unused
* - decoding: Set by libavcodec.
*/
    short *dct_coeff;

    /**
* motion reference frame index
* the order in which these are stored can depend on the codec.
* - encoding: Set by user.
* - decoding: Set by libavcodec.
*/
    int8_t *ref_index[2];

    /**
* reordered opaque 64bit (generally an integer or a double precision float
* PTS but can be anything).
* The user sets AVCodecContext.reordered_opaque to represent the input at
* that time,
* the decoder reorders values as needed and sets AVFrame.reordered_opaque
* to exactly one of the values provided by the user through AVCodecContext.reordered_opaque
* @deprecated in favor of pkt_pts
* - encoding: unused
* - decoding: Read by user.
*/
    int64_t reordered_opaque;

    /**
* hardware accelerator private data (Libav-allocated)
* - encoding: unused
* - decoding: Set by libavcodec
*/
    void *hwaccel_picture_private;

    /**
* reordered pts from the last AVPacket that has been input into the decoder
* - encoding: unused
* - decoding: Read by user.
*/
    int64_t pkt_pts;

    /**
* dts from the last AVPacket that has been input into the decoder
* - encoding: unused
* - decoding: Read by user.
*/
    int64_t pkt_dts;

    /**
* the AVCodecContext which ff_thread_get_buffer() was last called on
* - encoding: Set by libavcodec.
* - decoding: Set by libavcodec.
*/
    struct AVCodecContext *owner;

    /**
* used by multithreading to store frame-specific info
* - encoding: Set by libavcodec.
* - decoding: Set by libavcodec.
*/
    void *thread_opaque;

    /**
* number of audio samples (per channel) described by this frame
* - encoding: unused
* - decoding: Set by libavcodec
*/
    int nb_samples;

    /**
* pointers to the data planes/channels.
*
* For video, this should simply point to data[].
*
* For planar audio, each channel has a separate data pointer, and
* linesize[0] contains the size of each channel buffer.
* For packed audio, there is just one data pointer, and linesize[0]
* contains the total size of the buffer for all channels.
*
* Note: Both data and extended_data will always be set by get_buffer(),
* but for planar audio with more channels that can fit in data,
* extended_data must be used by the decoder in order to access all
* channels.
*
* encoding: unused
* decoding: set by AVCodecContext.get_buffer()
*/
    uint8_t **extended_data;
} AVFrame;

struct AVCodecInternal;

/**
* main external API structure.
* New fields can be added to the end with minor version bumps.
* Removal, reordering and changes to existing fields require a major
* version bump.
* sizeof(AVCodecContext) must not be used outside libav*.
*/
typedef struct AVCodecContext {
    /**
* information on struct for av_log
* - set by avcodec_alloc_context3
*/
    const AVClass *av_class;
    /**
* the average bitrate
* - encoding: Set by user; unused for constant quantizer encoding.
* - decoding: Set by libavcodec. 0 or some bitrate if this info is available in the stream.
*/
    int bit_rate;

    /**
* number of bits the bitstream is allowed to diverge from the reference.
* the reference can be CBR (for CBR pass1) or VBR (for pass2)
* - encoding: Set by user; unused for constant quantizer encoding.
* - decoding: unused
*/
    int bit_rate_tolerance;

    /**
* CODEC_FLAG_*.
* - encoding: Set by user.
* - decoding: Set by user.
*/
    int flags;

    /**
* Some codecs need additional format info. It is stored here.
* If any muxer uses this then ALL demuxers/parsers AND encoders for the
* specific codec MUST set it correctly otherwise stream copy breaks.
* In general use of this field by muxers is not recommended.
* - encoding: Set by libavcodec.
* - decoding: Set by libavcodec. (FIXME: Is this OK?)
*/
    int sub_id;

    /**
* Motion estimation algorithm used for video coding.
* 1 (zero), 2 (full), 3 (log), 4 (phods), 5 (epzs), 6 (x1), 7 (hex),
* 8 (umh), 9 (iter), 10 (tesa) [7, 8, 10 are x264 specific, 9 is snow specific]
* - encoding: MUST be set by user.
* - decoding: unused
*/
    int me_method;

    /**
* some codecs need / can use extradata like Huffman tables.
* mjpeg: Huffman tables
* rv10: additional flags
* mpeg4: global headers (they can be in the bitstream or here)
* The allocated memory should be FF_INPUT_BUFFER_PADDING_SIZE bytes larger
* than extradata_size to avoid prolems if it is read with the bitstream reader.
* The bytewise contents of extradata must not depend on the architecture or CPU endianness.
* - encoding: Set/allocated/freed by libavcodec.
* - decoding: Set/allocated/freed by user.
*/
    uint8_t *extradata;
    int extradata_size;

    /**
* This is the fundamental unit of time (in seconds) in terms
* of which frame timestamps are represented. For fixed-fps content,
* timebase should be 1/framerate and timestamp increments should be
* identically 1.
* - encoding: MUST be set by user.
* - decoding: Set by libavcodec.
*/
    AVRational time_base;

    /* video only */
    /**
* picture width / height.
* - encoding: MUST be set by user.
* - decoding: Set by libavcodec.
* Note: For compatibility it is possible to set this instead of
* coded_width/height before decoding.
*/
    int width, height;

#define FF_ASPECT_EXTENDED 15

    /**
* the number of pictures in a group of pictures, or 0 for intra_only
* - encoding: Set by user.
* - decoding: unused
*/
    int gop_size;

    /**
* Pixel format, see PIX_FMT_xxx.
* May be set by the demuxer if known from headers.
* May be overriden by the decoder if it knows better.
* - encoding: Set by user.
* - decoding: Set by user if known, overridden by libavcodec if known
*/
    enum PixelFormat pix_fmt;

    /**
* If non NULL, 'draw_horiz_band' is called by the libavcodec
* decoder to draw a horizontal band. It improves cache usage. Not
* all codecs can do that. You must check the codec capabilities
* beforehand.
* When multithreading is used, it may be called from multiple threads
* at the same time; threads might draw different parts of the same AVFrame,
* or multiple AVFrames, and there is no guarantee that slices will be drawn
* in order.
* The function is also used by hardware acceleration APIs.
* It is called at least once during frame decoding to pass
* the data needed for hardware render.
* In that mode instead of pixel data, AVFrame points to
* a structure specific to the acceleration API. The application
* reads the structure and can change some fields to indicate progress
* or mark state.
* - encoding: unused
* - decoding: Set by user.
* @param height the height of the slice
* @param y the y position of the slice
* @param type 1->top field, 2->bottom field, 3->frame
* @param offset offset into the AVFrame.data from which the slice should be read
*/
    void (*draw_horiz_band)(struct AVCodecContext *s,
                            const AVFrame *src, int offset[AV_NUM_DATA_POINTERS],
                            int y, int type, int height);

    /* audio only */
    int sample_rate; ///< samples per second
    int channels; ///< number of audio channels

    /**
* audio sample format
* - encoding: Set by user.
* - decoding: Set by libavcodec.
*/
    enum AVSampleFormat sample_fmt; ///< sample format

    /* The following data should not be initialized. */
    /**
* Samples per packet, initialized when calling 'init'.
*/
    int frame_size;
    int frame_number; ///< audio or video frame number

    /**
* Number of frames the decoded output will be delayed relative to
* the encoded input.
* - encoding: Set by libavcodec.
* - decoding: unused
*/
    int delay;

    /* - encoding parameters */
    float qcompress; ///< amount of qscale change between easy & hard scenes (0.0-1.0)
    float qblur; ///< amount of qscale smoothing over time (0.0-1.0)

    /**
* minimum quantizer
* - encoding: Set by user.
* - decoding: unused
*/
    int qmin;

    /**
* maximum quantizer
* - encoding: Set by user.
* - decoding: unused
*/
    int qmax;

    /**
* maximum quantizer difference between frames
* - encoding: Set by user.
* - decoding: unused
*/
    int max_qdiff;

    /**
* maximum number of B-frames between non-B-frames
* Note: The output will be delayed by max_b_frames+1 relative to the input.
* - encoding: Set by user.
* - decoding: unused
*/
    int max_b_frames;

    /**
* qscale factor between IP and B-frames
* If > 0 then the last P-frame quantizer will be used (q= lastp_q*factor+offset).
* If < 0 then normal ratecontrol will be done (q= -normal_q*factor+offset).
* - encoding: Set by user.
* - decoding: unused
*/
    float b_quant_factor;

    /** obsolete FIXME remove */
    int rc_strategy;
#define FF_RC_STRATEGY_XVID 1

    int b_frame_strategy;

    struct AVCodec *codec;

    void *priv_data;

    int rtp_payload_size; /* The size of the RTP payload: the coder will */
                            /* do its best to deliver a chunk with size */
                            /* below rtp_payload_size, the chunk will start */
                            /* with a start code on some codecs like H.263. */
                            /* This doesn't take account of any particular */
                            /* headers inside the transmitted RTP payload. */


    /* The RTP callback: This function is called */
    /* every time the encoder has a packet to send. */
    /* It depends on the encoder if the data starts */
    /* with a Start Code (it should). H.263 does. */
    /* mb_nb contains the number of macroblocks */
    /* encoded in the RTP payload. */
    void (*rtp_callback)(struct AVCodecContext *avctx, void *data, int size, int mb_nb);

    /* statistics, used for 2-pass encoding */
    int mv_bits;
    int header_bits;
    int i_tex_bits;
    int p_tex_bits;
    int i_count;
    int p_count;
    int skip_count;
    int misc_bits;

    /**
* number of bits used for the previously encoded frame
* - encoding: Set by libavcodec.
* - decoding: unused
*/
    int frame_bits;

    /**
* Private data of the user, can be used to carry app specific stuff.
* - encoding: Set by user.
* - decoding: Set by user.
*/
    void *opaque;

    char codec_name[32];
    enum AVMediaType codec_type; /* see AVMEDIA_TYPE_xxx */
    enum CodecID codec_id; /* see CODEC_ID_xxx */

    /**
* fourcc (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A').
* This is used to work around some encoder bugs.
* A demuxer should set this to what is stored in the field used to identify the codec.
* If there are multiple such fields in a container then the demuxer should choose the one
* which maximizes the information about the used codec.
* If the codec tag field in a container is larger than 32 bits then the demuxer should
* remap the longer ID to 32 bits with a table or other structure. Alternatively a new
* extra_codec_tag + size could be added but for this a clear advantage must be demonstrated
* first.
* - encoding: Set by user, if not then the default based on codec_id will be used.
* - decoding: Set by user, will be converted to uppercase by libavcodec during init.
*/
    unsigned int codec_tag;

    /**
* Work around bugs in encoders which sometimes cannot be detected automatically.
* - encoding: Set by user
* - decoding: Set by user
*/
    int workaround_bugs;
#define FF_BUG_AUTODETECT 1 ///< autodetection
#define FF_BUG_OLD_MSMPEG4 2
#define FF_BUG_XVID_ILACE 4
#define FF_BUG_UMP4 8
#define FF_BUG_NO_PADDING 16
#define FF_BUG_AMV 32
#define FF_BUG_AC_VLC 0 ///< Will be removed, libavcodec can now handle these non-compliant files by default.
#define FF_BUG_QPEL_CHROMA 64
#define FF_BUG_STD_QPEL 128
#define FF_BUG_QPEL_CHROMA2 256
#define FF_BUG_DIRECT_BLOCKSIZE 512
#define FF_BUG_EDGE 1024
#define FF_BUG_HPEL_CHROMA 2048
#define FF_BUG_DC_CLIP 4096
#define FF_BUG_MS 8192 ///< Work around various bugs in Microsoft's broken decoders.
#define FF_BUG_TRUNCATED 16384
//#define FF_BUG_FAKE_SCALABILITY 16 //Autodetection should work 100%.

    /**
* luma single coefficient elimination threshold
* - encoding: Set by user.
* - decoding: unused
*/
    int luma_elim_threshold;

    /**
* chroma single coeff elimination threshold
* - encoding: Set by user.
* - decoding: unused
*/
    int chroma_elim_threshold;

    /**
* strictly follow the standard (MPEG4, ...).
* - encoding: Set by user.
* - decoding: Set by user.
* Setting this to STRICT or higher means the encoder and decoder will
* generally do stupid things, whereas setting it to unofficial or lower
* will mean the encoder might produce output that is not supported by all
* spec-compliant decoders. Decoders don't differentiate between normal,
* unofficial and experimental (that is, they always try to decode things
* when they can) unless they are explicitly asked to behave stupidly
* (=strictly conform to the specs)
*/
    int strict_std_compliance;
#define FF_COMPLIANCE_VERY_STRICT 2 ///< Strictly conform to an older more strict version of the spec or reference software.
#define FF_COMPLIANCE_STRICT 1 ///< Strictly conform to all the things in the spec no matter what consequences.
#define FF_COMPLIANCE_NORMAL 0
#define FF_COMPLIANCE_UNOFFICIAL -1 ///< Allow unofficial extensions
#define FF_COMPLIANCE_EXPERIMENTAL -2 ///< Allow nonstandardized experimental things.

    /**
* qscale offset between IP and B-frames
* - encoding: Set by user.
* - decoding: unused
*/
    float b_quant_offset;

#if FF_API_ER
    /**
* Error recognition; higher values will detect more errors but may
* misdetect some more or less valid parts as errors.
* - encoding: unused
* - decoding: Set by user.
*/
    attribute_deprecated int error_recognition;
#define FF_ER_CAREFUL 1
#define FF_ER_COMPLIANT 2
#define FF_ER_AGGRESSIVE 3
#define FF_ER_VERY_AGGRESSIVE 4
#define FF_ER_EXPLODE 5
#endif /* FF_API_ER */

    /**
* Called at the beginning of each frame to get a buffer for it.
*
* The function will set AVFrame.data[], AVFrame.linesize[].
* AVFrame.extended_data[] must also be set, but it should be the same as
* AVFrame.data[] except for planar audio with more channels than can fit
* in AVFrame.data[]. In that case, AVFrame.data[] shall still contain as
* many data pointers as it can hold.
*
* if CODEC_CAP_DR1 is not set then get_buffer() must call
* avcodec_default_get_buffer() instead of providing buffers allocated by
* some other means.
*
* AVFrame.data[] should be 32- or 16-byte-aligned unless the CPU doesn't
* need it. avcodec_default_get_buffer() aligns the output buffer properly,
* but if get_buffer() is overridden then alignment considerations should
* be taken into account.
*
* @see avcodec_default_get_buffer()
*
* Video:
*
* If pic.reference is set then the frame will be read later by libavcodec.
* avcodec_align_dimensions2() should be used to find the required width and
* height, as they normally need to be rounded up to the next multiple of 16.
*
* If frame multithreading is used and thread_safe_callbacks is set,
* it may be called from a different thread, but not from more than one at
* once. Does not need to be reentrant.
*
* @see release_buffer(), reget_buffer()
* @see avcodec_align_dimensions2()
*
* Audio:
*
* Decoders request a buffer of a particular size by setting
* AVFrame.nb_samples prior to calling get_buffer(). The decoder may,
* however, utilize only part of the buffer by setting AVFrame.nb_samples
* to a smaller value in the output frame.
*
* Decoders cannot use the buffer after returning from
* avcodec_decode_audio4(), so they will not call release_buffer(), as it
* is assumed to be released immediately upon return.
*
* As a convenience, av_samples_get_buffer_size() and
* av_samples_fill_arrays() in libavutil may be used by custom get_buffer()
* functions to find the required data size and to fill data pointers and
* linesize. In AVFrame.linesize, only linesize[0] may be set for audio
* since all planes must be the same size.
*
* @see av_samples_get_buffer_size(), av_samples_fill_arrays()
*
* - encoding: unused
* - decoding: Set by libavcodec, user can override.
*/
    int (*get_buffer)(struct AVCodecContext *c, AVFrame *pic);

    /**
* Called to release buffers which were allocated with get_buffer.
* A released buffer can be reused in get_buffer().
* pic.data[*] must be set to NULL.
* May be called from a different thread if frame multithreading is used,
* but not by more than one thread at once, so does not need to be reentrant.
* - encoding: unused
* - decoding: Set by libavcodec, user can override.
*/
    void (*release_buffer)(struct AVCodecContext *c, AVFrame *pic);

    /**
* Size of the frame reordering buffer in the decoder.
* For MPEG-2 it is 1 IPB or 0 low delay IP.
* - encoding: Set by libavcodec.
* - decoding: Set by libavcodec.
*/
    int has_b_frames;

    /**
* number of bytes per packet if constant and known or 0
* Used by some WAV based audio codecs.
*/
    int block_align;

#if FF_API_PARSE_FRAME
    /**
* If true, only parsing is done. The frame data is returned.
* Only MPEG audio decoders support this now.
* - encoding: unused
* - decoding: Set by user
*/
    attribute_deprecated int parse_only;
#endif

    /**
* 0-> h263 quant 1-> mpeg quant
* - encoding: Set by user.
* - decoding: unused
*/
    int mpeg_quant;

    /**
* pass1 encoding statistics output buffer
* - encoding: Set by libavcodec.
* - decoding: unused
*/
    char *stats_out;

    /**
* pass2 encoding statistics input buffer
* Concatenated stuff from stats_out of pass1 should be placed here.
* - encoding: Allocated/set/freed by user.
* - decoding: unused
*/
    char *stats_in;

    /**
* ratecontrol qmin qmax limiting method
* 0-> clipping, 1-> use a nice continous function to limit qscale wthin qmin/qmax.
* - encoding: Set by user.
* - decoding: unused
*/
    float rc_qsquish;

    float rc_qmod_amp;
    int rc_qmod_freq;

    /**
* ratecontrol override, see RcOverride
* - encoding: Allocated/set/freed by user.
* - decoding: unused
*/
    RcOverride *rc_override;
    int rc_override_count;

    /**
* rate control equation
* - encoding: Set by user
* - decoding: unused
*/
    const char *rc_eq;

    /**
* maximum bitrate
* - encoding: Set by user.
* - decoding: unused
*/
    int rc_max_rate;

    /**
* minimum bitrate
* - encoding: Set by user.
* - decoding: unused
*/
    int rc_min_rate;

    /**
* decoder bitstream buffer size
* - encoding: Set by user.
* - decoding: unused
*/
    int rc_buffer_size;
    float rc_buffer_aggressivity;

    /**
* qscale factor between P and I-frames
* If > 0 then the last p frame quantizer will be used (q= lastp_q*factor+offset).
* If < 0 then normal ratecontrol will be done (q= -normal_q*factor+offset).
* - encoding: Set by user.
* - decoding: unused
*/
    float i_quant_factor;

    /**
* qscale offset between P and I-frames
* - encoding: Set by user.
* - decoding: unused
*/
    float i_quant_offset;

    /**
* initial complexity for pass1 ratecontrol
* - encoding: Set by user.
* - decoding: unused
*/
    float rc_initial_cplx;

    /**
* DCT algorithm, see FF_DCT_* below
* - encoding: Set by user.
* - decoding: unused
*/
    int dct_algo;
#define FF_DCT_AUTO 0
#define FF_DCT_FASTINT 1
#define FF_DCT_INT 2
#define FF_DCT_MMX 3
#define FF_DCT_MLIB 4
#define FF_DCT_ALTIVEC 5
#define FF_DCT_FAAN 6

    /**
* luminance masking (0-> disabled)
* - encoding: Set by user.
* - decoding: unused
*/
    float lumi_masking;

    /**
* temporary complexity masking (0-> disabled)
* - encoding: Set by user.
* - decoding: unused
*/
    float temporal_cplx_masking;

    /**
* spatial complexity masking (0-> disabled)
* - encoding: Set by user.
* - decoding: unused
*/
    float spatial_cplx_masking;

    /**
* p block masking (0-> disabled)
* - encoding: Set by user.
* - decoding: unused
*/
    float p_masking;

    /**
* darkness masking (0-> disabled)
* - encoding: Set by user.
* - decoding: unused
*/
    float dark_masking;

    /**
* IDCT algorithm, see FF_IDCT_* below.
* - encoding: Set by user.
* - decoding: Set by user.
*/
    int idct_algo;
#define FF_IDCT_AUTO 0
#define FF_IDCT_INT 1
#define FF_IDCT_SIMPLE 2
#define FF_IDCT_SIMPLEMMX 3
#define FF_IDCT_LIBMPEG2MMX 4
#define FF_IDCT_PS2 5
#define FF_IDCT_MLIB 6
#define FF_IDCT_ARM 7
#define FF_IDCT_ALTIVEC 8
#define FF_IDCT_SH4 9
#define FF_IDCT_SIMPLEARM 10
#define FF_IDCT_H264 11
#define FF_IDCT_VP3 12
#define FF_IDCT_IPP 13
#define FF_IDCT_XVIDMMX 14
#define FF_IDCT_CAVS 15
#define FF_IDCT_SIMPLEARMV5TE 16
#define FF_IDCT_SIMPLEARMV6 17
#define FF_IDCT_SIMPLEVIS 18
#define FF_IDCT_WMV2 19
#define FF_IDCT_FAAN 20
#define FF_IDCT_EA 21
#define FF_IDCT_SIMPLENEON 22
#define FF_IDCT_SIMPLEALPHA 23
#define FF_IDCT_BINK 24

    /**
* slice count
* - encoding: Set by libavcodec.
* - decoding: Set by user (or 0).
*/
    int slice_count;
    /**
* slice offsets in the frame in bytes
* - encoding: Set/allocated by libavcodec.
* - decoding: Set/allocated by user (or NULL).
*/
    int *slice_offset;

    /**
* error concealment flags
* - encoding: unused
* - decoding: Set by user.
*/
    int error_concealment;
#define FF_EC_GUESS_MVS 1
#define FF_EC_DEBLOCK 2

    /**
* dsp_mask could be add used to disable unwanted CPU features
* CPU features (i.e. MMX, SSE. ...)
*
* With the FORCE flag you may instead enable given CPU features.
* (Dangerous: Usable in case of misdetection, improper usage however will
* result into program crash.)
*/
    unsigned dsp_mask;

    /**
* bits per sample/pixel from the demuxer (needed for huffyuv).
* - encoding: Set by libavcodec.
* - decoding: Set by user.
*/
     int bits_per_coded_sample;

    /**
* prediction method (needed for huffyuv)
* - encoding: Set by user.
* - decoding: unused
*/
     int prediction_method;
#define FF_PRED_LEFT 0
#define FF_PRED_PLANE 1
#define FF_PRED_MEDIAN 2

    /**
* sample aspect ratio (0 if unknown)
* That is the width of a pixel divided by the height of the pixel.
* Numerator and denominator must be relatively prime and smaller than 256 for some video standards.
* - encoding: Set by user.
* - decoding: Set by libavcodec.
*/
    AVRational sample_aspect_ratio;

    /**
* the picture in the bitstream
* - encoding: Set by libavcodec.
* - decoding: Set by libavcodec.
*/
    AVFrame *coded_frame;

    /**
* debug
* - encoding: Set by user.
* - decoding: Set by user.
*/
    int debug;
#define FF_DEBUG_PICT_INFO 1
#define FF_DEBUG_RC 2
#define FF_DEBUG_BITSTREAM 4
#define FF_DEBUG_MB_TYPE 8
#define FF_DEBUG_QP 16
#define FF_DEBUG_MV 32
#define FF_DEBUG_DCT_COEFF 0x00000040
#define FF_DEBUG_SKIP 0x00000080
#define FF_DEBUG_STARTCODE 0x00000100
#define FF_DEBUG_PTS 0x00000200
#define FF_DEBUG_ER 0x00000400
#define FF_DEBUG_MMCO 0x00000800
#define FF_DEBUG_BUGS 0x00001000
#define FF_DEBUG_VIS_QP 0x00002000
#define FF_DEBUG_VIS_MB_TYPE 0x00004000
#define FF_DEBUG_BUFFERS 0x00008000
#define FF_DEBUG_THREADS 0x00010000

    /**
* debug
* - encoding: Set by user.
* - decoding: Set by user.
*/
    int debug_mv;
#define FF_DEBUG_VIS_MV_P_FOR 0x00000001 //visualize forward predicted MVs of P frames
#define FF_DEBUG_VIS_MV_B_FOR 0x00000002 //visualize forward predicted MVs of B frames
#define FF_DEBUG_VIS_MV_B_BACK 0x00000004 //visualize backward predicted MVs of B frames

    /**
* error
* - encoding: Set by libavcodec if flags&CODEC_FLAG_PSNR.
* - decoding: unused
*/
    uint64_t error[AV_NUM_DATA_POINTERS];

    /**
* motion estimation comparison function
* - encoding: Set by user.
* - decoding: unused
*/
    int me_cmp;
    /**
* subpixel motion estimation comparison function
* - encoding: Set by user.
* - decoding: unused
*/
    int me_sub_cmp;
    /**
* macroblock comparison function (not supported yet)
* - encoding: Set by user.
* - decoding: unused
*/
    int mb_cmp;
    /**
* interlaced DCT comparison function
* - encoding: Set by user.
* - decoding: unused
*/
    int ildct_cmp;
#define FF_CMP_SAD 0
#define FF_CMP_SSE 1
#define FF_CMP_SATD 2
#define FF_CMP_DCT 3
#define FF_CMP_PSNR 4
#define FF_CMP_BIT 5
#define FF_CMP_RD 6
#define FF_CMP_ZERO 7
#define FF_CMP_VSAD 8
#define FF_CMP_VSSE 9
#define FF_CMP_NSSE 10
#define FF_CMP_W53 11
#define FF_CMP_W97 12
#define FF_CMP_DCTMAX 13
#define FF_CMP_DCT264 14
#define FF_CMP_CHROMA 256

    /**
* ME diamond size & shape
* - encoding: Set by user.
* - decoding: unused
*/
    int dia_size;

    /**
* amount of previous MV predictors (2a+1 x 2a+1 square)
* - encoding: Set by user.
* - decoding: unused
*/
    int last_predictor_count;

    /**
* prepass for motion estimation
* - encoding: Set by user.
* - decoding: unused
*/
    int pre_me;

    /**
* motion estimation prepass comparison function
* - encoding: Set by user.
* - decoding: unused
*/
    int me_pre_cmp;

    /**
* ME prepass diamond size & shape
* - encoding: Set by user.
* - decoding: unused
*/
    int pre_dia_size;

    /**
* subpel ME quality
* - encoding: Set by user.
* - decoding: unused
*/
    int me_subpel_quality;

    /**
* callback to negotiate the pixelFormat
* @param fmt is the list of formats which are supported by the codec,
* it is terminated by -1 as 0 is a valid format, the formats are ordered by quality.
* The first is always the native one.
* @return the chosen format
* - encoding: unused
* - decoding: Set by user, if not set the native format will be chosen.
*/
    enum PixelFormat (*get_format)(struct AVCodecContext *s, const enum PixelFormat * fmt);

    /**
* DTG active format information (additional aspect ratio
* information only used in DVB MPEG-2 transport streams)
* 0 if not set.
*
* - encoding: unused
* - decoding: Set by decoder.
*/
    int dtg_active_format;
#define FF_DTG_AFD_SAME 8
#define FF_DTG_AFD_4_3 9
#define FF_DTG_AFD_16_9 10
#define FF_DTG_AFD_14_9 11
#define FF_DTG_AFD_4_3_SP_14_9 13
#define FF_DTG_AFD_16_9_SP_14_9 14
#define FF_DTG_AFD_SP_4_3 15

    /**
* maximum motion estimation search range in subpel units
* If 0 then no limit.
*
* - encoding: Set by user.
* - decoding: unused
*/
    int me_range;

    /**
* intra quantizer bias
* - encoding: Set by user.
* - decoding: unused
*/
    int intra_quant_bias;
#define FF_DEFAULT_QUANT_BIAS 999999

    /**
* inter quantizer bias
* - encoding: Set by user.
* - decoding: unused
*/
    int inter_quant_bias;

    /**
* color table ID
* - encoding: unused
* - decoding: Which clrtable should be used for 8bit RGB images.
* Tables have to be stored somewhere. FIXME
*/
    int color_table_id;

#if FF_API_INTERNAL_CONTEXT
    /**
* internal_buffer count
* Don't touch, used by libavcodec default_get_buffer().
* @deprecated this field was moved to an internal context
*/
    attribute_deprecated int internal_buffer_count;

    /**
* internal_buffers
* Don't touch, used by libavcodec default_get_buffer().
* @deprecated this field was moved to an internal context
*/
    attribute_deprecated void *internal_buffer;
#endif

    /**
* Global quality for codecs which cannot change it per frame.
* This should be proportional to MPEG-1/2/4 qscale.
* - encoding: Set by user.
* - decoding: unused
*/
    int global_quality;

#define FF_CODER_TYPE_VLC 0
#define FF_CODER_TYPE_AC 1
#define FF_CODER_TYPE_RAW 2
#define FF_CODER_TYPE_RLE 3
#define FF_CODER_TYPE_DEFLATE 4
    /**
* coder type
* - encoding: Set by user.
* - decoding: unused
*/
    int coder_type;

    /**
* context model
* - encoding: Set by user.
* - decoding: unused
*/
    int context_model;
#if 0
/**
*
* - encoding: unused
* - decoding: Set by user.
*/
uint8_t * (*realloc)(struct AVCodecContext *s, uint8_t *buf, int buf_size);
#endif

    /**
* slice flags
* - encoding: unused
* - decoding: Set by user.
*/
    int slice_flags;
#define SLICE_FLAG_CODED_ORDER 0x0001 ///< draw_horiz_band() is called in coded order instead of display
#define SLICE_FLAG_ALLOW_FIELD 0x0002 ///< allow draw_horiz_band() with field slices (MPEG2 field pics)
#define SLICE_FLAG_ALLOW_PLANE 0x0004 ///< allow draw_horiz_band() with 1 component at a time (SVQ1)

    /**
* XVideo Motion Acceleration
* - encoding: forbidden
* - decoding: set by decoder
*/
    int xvmc_acceleration;

    /**
* macroblock decision mode
* - encoding: Set by user.
* - decoding: unused
*/
    int mb_decision;
#define FF_MB_DECISION_SIMPLE 0 ///< uses mb_cmp
#define FF_MB_DECISION_BITS 1 ///< chooses the one which needs the fewest bits
#define FF_MB_DECISION_RD 2 ///< rate distortion

    /**
* custom intra quantization matrix
* - encoding: Set by user, can be NULL.
* - decoding: Set by libavcodec.
*/
    uint16_t *intra_matrix;

    /**
* custom inter quantization matrix
* - encoding: Set by user, can be NULL.
* - decoding: Set by libavcodec.
*/
    uint16_t *inter_matrix;

    /**
* fourcc from the AVI stream header (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A').
* This is used to work around some encoder bugs.
* - encoding: unused
* - decoding: Set by user, will be converted to uppercase by libavcodec during init.
*/
    unsigned int stream_codec_tag;

    /**
* scene change detection threshold
* 0 is default, larger means fewer detected scene changes.
* - encoding: Set by user.
* - decoding: unused
*/
    int scenechange_threshold;

    /**
* minimum Lagrange multipler
* - encoding: Set by user.
* - decoding: unused
*/
    int lmin;

    /**
* maximum Lagrange multipler
* - encoding: Set by user.
* - decoding: unused
*/
    int lmax;

#if FF_API_PALETTE_CONTROL
    /**
* palette control structure
* - encoding: ??? (no palette-enabled encoder yet)
* - decoding: Set by user.
*/
    struct AVPaletteControl *palctrl;
#endif

    /**
* noise reduction strength
* - encoding: Set by user.
* - decoding: unused
*/
    int noise_reduction;

    /**
* Called at the beginning of a frame to get cr buffer for it.
* Buffer type (size, hints) must be the same. libavcodec won't check it.
* libavcodec will pass previous buffer in pic, function should return
* same buffer or new buffer with old frame "painted" into it.
* If pic.data[0] == NULL must behave like get_buffer().
* if CODEC_CAP_DR1 is not set then reget_buffer() must call
* avcodec_default_reget_buffer() instead of providing buffers allocated by
* some other means.
* - encoding: unused
* - decoding: Set by libavcodec, user can override.
*/
    int (*reget_buffer)(struct AVCodecContext *c, AVFrame *pic);

    /**
* Number of bits which should be loaded into the rc buffer before decoding starts.
* - encoding: Set by user.
* - decoding: unused
*/
    int rc_initial_buffer_occupancy;

    /**
*
* - encoding: Set by user.
* - decoding: unused
*/
    int inter_threshold;

    /**
* CODEC_FLAG2_*
* - encoding: Set by user.
* - decoding: Set by user.
*/
    int flags2;

    /**
* Simulates errors in the bitstream to test error concealment.
* - encoding: Set by user.
* - decoding: unused
*/
    int error_rate;

#if FF_API_ANTIALIAS_ALGO
    /**
* MP3 antialias algorithm, see FF_AA_* below.
* - encoding: unused
* - decoding: Set by user.
*/
    attribute_deprecated int antialias_algo;
#define FF_AA_AUTO 0
#define FF_AA_FASTINT 1 //not implemented yet
#define FF_AA_INT 2
#define FF_AA_FLOAT 3
#endif

    /**
* quantizer noise shaping
* - encoding: Set by user.
* - decoding: unused
*/
    int quantizer_noise_shaping;

    /**
* thread count
* is used to decide how many independent tasks should be passed to execute()
* - encoding: Set by user.
* - decoding: Set by user.
*/
    int thread_count;

    /**
* The codec may call this to execute several independent things.
* It will return only after finishing all tasks.
* The user may replace this with some multithreaded implementation,
* the default implementation will execute the parts serially.
* @param count the number of things to execute
* - encoding: Set by libavcodec, user can override.
* - decoding: Set by libavcodec, user can override.
*/
    int (*execute)(struct AVCodecContext *c, int (*func)(struct AVCodecContext *c2, void *arg), void *arg2, int *ret, int count, int size);

    /**
* thread opaque
* Can be used by execute() to store some per AVCodecContext stuff.
* - encoding: set by execute()
* - decoding: set by execute()
*/
    void *thread_opaque;

    /**
* Motion estimation threshold below which no motion estimation is
* performed, but instead the user specified motion vectors are used.
*
* - encoding: Set by user.
* - decoding: unused
*/
     int me_threshold;

    /**
* Macroblock threshold below which the user specified macroblock types will be used.
* - encoding: Set by user.
* - decoding: unused
*/
     int mb_threshold;

    /**
* precision of the intra DC coefficient - 8
* - encoding: Set by user.
* - decoding: unused
*/
     int intra_dc_precision;

    /**
* noise vs. sse weight for the nsse comparsion function
* - encoding: Set by user.
* - decoding: unused
*/
     int nsse_weight;

    /**
* Number of macroblock rows at the top which are skipped.
* - encoding: unused
* - decoding: Set by user.
*/
     int skip_top;

    /**
* Number of macroblock rows at the bottom which are skipped.
* - encoding: unused
* - decoding: Set by user.
*/
     int skip_bottom;

    /**
* profile
* - encoding: Set by user.
* - decoding: Set by libavcodec.
*/
     int profile;
#define FF_PROFILE_UNKNOWN -99
#define FF_PROFILE_RESERVED -100

#define FF_PROFILE_AAC_MAIN 0
#define FF_PROFILE_AAC_LOW 1
#define FF_PROFILE_AAC_SSR 2
#define FF_PROFILE_AAC_LTP 3

#define FF_PROFILE_DTS 20
#define FF_PROFILE_DTS_ES 30
#define FF_PROFILE_DTS_96_24 40
#define FF_PROFILE_DTS_HD_HRA 50
#define FF_PROFILE_DTS_HD_MA 60

#define FF_PROFILE_MPEG2_422 0
#define FF_PROFILE_MPEG2_HIGH 1
#define FF_PROFILE_MPEG2_SS 2
#define FF_PROFILE_MPEG2_SNR_SCALABLE 3
#define FF_PROFILE_MPEG2_MAIN 4
#define FF_PROFILE_MPEG2_SIMPLE 5

#define FF_PROFILE_H264_CONSTRAINED (1<<9) // 8+1; constraint_set1_flag
#define FF_PROFILE_H264_INTRA (1<<11) // 8+3; constraint_set3_flag

#define FF_PROFILE_H264_BASELINE 66
#define FF_PROFILE_H264_CONSTRAINED_BASELINE (66|FF_PROFILE_H264_CONSTRAINED)
#define FF_PROFILE_H264_MAIN 77
#define FF_PROFILE_H264_EXTENDED 88
#define FF_PROFILE_H264_HIGH 100
#define FF_PROFILE_H264_HIGH_10 110
#define FF_PROFILE_H264_HIGH_10_INTRA (110|FF_PROFILE_H264_INTRA)
#define FF_PROFILE_H264_HIGH_422 122
#define FF_PROFILE_H264_HIGH_422_INTRA (122|FF_PROFILE_H264_INTRA)
#define FF_PROFILE_H264_HIGH_444 144
#define FF_PROFILE_H264_HIGH_444_PREDICTIVE 244
#define FF_PROFILE_H264_HIGH_444_INTRA (244|FF_PROFILE_H264_INTRA)
#define FF_PROFILE_H264_CAVLC_444 44

#define FF_PROFILE_VC1_SIMPLE 0
#define FF_PROFILE_VC1_MAIN 1
#define FF_PROFILE_VC1_COMPLEX 2
#define FF_PROFILE_VC1_ADVANCED 3

#define FF_PROFILE_MPEG4_SIMPLE 0
#define FF_PROFILE_MPEG4_SIMPLE_SCALABLE 1
#define FF_PROFILE_MPEG4_CORE 2
#define FF_PROFILE_MPEG4_MAIN 3
#define FF_PROFILE_MPEG4_N_BIT 4
#define FF_PROFILE_MPEG4_SCALABLE_TEXTURE 5
#define FF_PROFILE_MPEG4_SIMPLE_FACE_ANIMATION 6
#define FF_PROFILE_MPEG4_BASIC_ANIMATED_TEXTURE 7
#define FF_PROFILE_MPEG4_HYBRID 8
#define FF_PROFILE_MPEG4_ADVANCED_REAL_TIME 9
#define FF_PROFILE_MPEG4_CORE_SCALABLE 10
#define FF_PROFILE_MPEG4_ADVANCED_CODING 11
#define FF_PROFILE_MPEG4_ADVANCED_CORE 12
#define FF_PROFILE_MPEG4_ADVANCED_SCALABLE_TEXTURE 13
#define FF_PROFILE_MPEG4_SIMPLE_STUDIO 14
#define FF_PROFILE_MPEG4_ADVANCED_SIMPLE 15

    /**
* level
* - encoding: Set by user.
* - decoding: Set by libavcodec.
*/
     int level;
#define FF_LEVEL_UNKNOWN -99

    /**
* low resolution decoding, 1-> 1/2 size, 2->1/4 size
* - encoding: unused
* - decoding: Set by user.
*/
     int lowres;

    /**
* Bitstream width / height, may be different from width/height if lowres enabled.
* - encoding: unused
* - decoding: Set by user before init if known. Codec should override / dynamically change if needed.
*/
    int coded_width, coded_height;

    /**
* frame skip threshold
* - encoding: Set by user.
* - decoding: unused
*/
    int frame_skip_threshold;

    /**
* frame skip factor
* - encoding: Set by user.
* - decoding: unused
*/
    int frame_skip_factor;

    /**
* frame skip exponent
* - encoding: Set by user.
* - decoding: unused
*/
    int frame_skip_exp;

    /**
* frame skip comparison function
* - encoding: Set by user.
* - decoding: unused
*/
    int frame_skip_cmp;

    /**
* Border processing masking, raises the quantizer for mbs on the borders
* of the picture.
* - encoding: Set by user.
* - decoding: unused
*/
    float border_masking;

    /**
* minimum MB lagrange multipler
* - encoding: Set by user.
* - decoding: unused
*/
    int mb_lmin;

    /**
* maximum MB lagrange multipler
* - encoding: Set by user.
* - decoding: unused
*/
    int mb_lmax;

    /**
*
* - encoding: Set by user.
* - decoding: unused
*/
    int me_penalty_compensation;

    /**
*
* - encoding: unused
* - decoding: Set by user.
*/
    enum AVDiscard skip_loop_filter;

    /**
*
* - encoding: unused
* - decoding: Set by user.
*/
    enum AVDiscard skip_idct;

    /**
*
* - encoding: unused
* - decoding: Set by user.
*/
    enum AVDiscard skip_frame;

    /**
*
* - encoding: Set by user.
* - decoding: unused
*/
    int bidir_refine;

    /**
*
* - encoding: Set by user.
* - decoding: unused
*/
    int brd_scale;

#if FF_API_X264_GLOBAL_OPTS
    /**
* constant rate factor - quality-based VBR - values ~correspond to qps
* - encoding: Set by user.
* - decoding: unused
* @deprecated use 'crf' libx264 private option
*/
    attribute_deprecated float crf;

    /**
* constant quantization parameter rate control method
* - encoding: Set by user.
* - decoding: unused
* @deprecated use 'cqp' libx264 private option
*/
    attribute_deprecated int cqp;
#endif

    /**
* minimum GOP size
* - encoding: Set by user.
* - decoding: unused
*/
    int keyint_min;

    /**
* number of reference frames
* - encoding: Set by user.
* - decoding: Set by lavc.
*/
    int refs;

    /**
* chroma qp offset from luma
* - encoding: Set by user.
* - decoding: unused
*/
    int chromaoffset;

#if FF_API_X264_GLOBAL_OPTS
    /**
* Influence how often B-frames are used.
* - encoding: Set by user.
* - decoding: unused
*/
    attribute_deprecated int bframebias;
#endif

    /**
* trellis RD quantization
* - encoding: Set by user.
* - decoding: unused
*/
    int trellis;

#if FF_API_X264_GLOBAL_OPTS
    /**
* Reduce fluctuations in qp (before curve compression).
* - encoding: Set by user.
* - decoding: unused
*/
    attribute_deprecated float complexityblur;

    /**
* in-loop deblocking filter alphac0 parameter
* alpha is in the range -6...6
* - encoding: Set by user.
* - decoding: unused
*/
    attribute_deprecated int deblockalpha;

    /**
* in-loop deblocking filter beta parameter
* beta is in the range -6...6
* - encoding: Set by user.
* - decoding: unused
*/
    attribute_deprecated int deblockbeta;

    /**
* macroblock subpartition sizes to consider - p8x8, p4x4, b8x8, i8x8, i4x4
* - encoding: Set by user.
* - decoding: unused
*/
    attribute_deprecated int partitions;
#define X264_PART_I4X4 0x001 /* Analyze i4x4 */
#define X264_PART_I8X8 0x002 /* Analyze i8x8 (requires 8x8 transform) */
#define X264_PART_P8X8 0x010 /* Analyze p16x8, p8x16 and p8x8 */
#define X264_PART_P4X4 0x020 /* Analyze p8x4, p4x8, p4x4 */
#define X264_PART_B8X8 0x100 /* Analyze b16x8, b8x16 and b8x8 */

    /**
* direct MV prediction mode - 0 (none), 1 (spatial), 2 (temporal), 3 (auto)
* - encoding: Set by user.
* - decoding: unused
*/
    attribute_deprecated int directpred;
#endif

    /**
* Audio cutoff bandwidth (0 means "automatic")
* - encoding: Set by user.
* - decoding: unused
*/
    int cutoff;

    /**
* Multiplied by qscale for each frame and added to scene_change_score.
* - encoding: Set by user.
* - decoding: unused
*/
    int scenechange_factor;

    /**
*
* Note: Value depends upon the compare function used for fullpel ME.
* - encoding: Set by user.
* - decoding: unused
*/
    int mv0_threshold;

    /**
* Adjust sensitivity of b_frame_strategy 1.
* - encoding: Set by user.
* - decoding: unused
*/
    int b_sensitivity;

    /**
* - encoding: Set by user.
* - decoding: unused
*/
    int compression_level;
#define FF_COMPRESSION_DEFAULT -1

    /**
* - encoding: Set by user.
* - decoding: unused
*/
    int min_prediction_order;

    /**
* - encoding: Set by user.
* - decoding: unused
*/
    int max_prediction_order;

#if FF_API_FLAC_GLOBAL_OPTS
    /**
* @name FLAC options
* @deprecated Use FLAC encoder private options instead.
* @{
*/

    /**
* LPC coefficient precision - used by FLAC encoder
* - encoding: Set by user.
* - decoding: unused
*/
    attribute_deprecated int lpc_coeff_precision;

    /**
* search method for selecting prediction order
* - encoding: Set by user.
* - decoding: unused
*/
    attribute_deprecated int prediction_order_method;

    /**
* - encoding: Set by user.
* - decoding: unused
*/
    attribute_deprecated int min_partition_order;

    /**
* - encoding: Set by user.
* - decoding: unused
*/
    attribute_deprecated int max_partition_order;
    /**
* @}
*/
#endif

    /**
* GOP timecode frame start number, in non drop frame format
* - encoding: Set by user.
* - decoding: unused
*/
    int64_t timecode_frame_start;

#if FF_API_REQUEST_CHANNELS
    /**
* Decoder should decode to this many channels if it can (0 for default)
* - encoding: unused
* - decoding: Set by user.
* @deprecated Deprecated in favor of request_channel_layout.
*/
    int request_channels;
#endif

#if FF_API_DRC_SCALE
    /**
* Percentage of dynamic range compression to be applied by the decoder.
* The default value is 1.0, corresponding to full compression.
* - encoding: unused
* - decoding: Set by user.
* @deprecated use AC3 decoder private option instead.
*/
    attribute_deprecated float drc_scale;
#endif

    /**
* opaque 64bit number (generally a PTS) that will be reordered and
* output in AVFrame.reordered_opaque
* @deprecated in favor of pkt_pts
* - encoding: unused
* - decoding: Set by user.
*/
    int64_t reordered_opaque;

    /**
* Bits per sample/pixel of internal libavcodec pixel/sample format.
* - encoding: set by user.
* - decoding: set by libavcodec.
*/
    int bits_per_raw_sample;

    /**
* Audio channel layout.
* - encoding: set by user.
* - decoding: set by libavcodec.
*/
    uint64_t channel_layout;

    /**
* Request decoder to use this channel layout if it can (0 for default)
* - encoding: unused
* - decoding: Set by user.
*/
    uint64_t request_channel_layout;

    /**
* Ratecontrol attempt to use, at maximum, <value> of what can be used without an underflow.
* - encoding: Set by user.
* - decoding: unused.
*/
    float rc_max_available_vbv_use;

    /**
* Ratecontrol attempt to use, at least, <value> times the amount needed to prevent a vbv overflow.
* - encoding: Set by user.
* - decoding: unused.
*/
    float rc_min_vbv_overflow_use;

    /**
* Hardware accelerator in use
* - encoding: unused.
* - decoding: Set by libavcodec
*/
    struct AVHWAccel *hwaccel;

    /**
* For some codecs, the time base is closer to the field rate than the frame rate.
* Most notably, H.264 and MPEG-2 specify time_base as half of frame duration
* if no telecine is used ...
*
* Set to time_base ticks per frame. Default 1, e.g., H.264/MPEG-2 set it to 2.
*/
    int ticks_per_frame;

    /**
* Hardware accelerator context.
* For some hardware accelerators, a global context needs to be
* provided by the user. In that case, this holds display-dependent
* data Libav cannot instantiate itself. Please refer to the
* Libav HW accelerator documentation to know how to fill this
* is. e.g. for VA API, this is a struct vaapi_context.
* - encoding: unused
* - decoding: Set by user
*/
    void *hwaccel_context;

    /**
* Chromaticity coordinates of the source primaries.
* - encoding: Set by user
* - decoding: Set by libavcodec
*/
    enum AVColorPrimaries color_primaries;

    /**
* Color Transfer Characteristic.
* - encoding: Set by user
* - decoding: Set by libavcodec
*/
    enum AVColorTransferCharacteristic color_trc;

    /**
* YUV colorspace type.
* - encoding: Set by user
* - decoding: Set by libavcodec
*/
    enum AVColorSpace colorspace;

    /**
* MPEG vs JPEG YUV range.
* - encoding: Set by user
* - decoding: Set by libavcodec
*/
    enum AVColorRange color_range;

    /**
* This defines the location of chroma samples.
* - encoding: Set by user
* - decoding: Set by libavcodec
*/
    enum AVChromaLocation chroma_sample_location;

    /**
* The codec may call this to execute several independent things.
* It will return only after finishing all tasks.
* The user may replace this with some multithreaded implementation,
* the default implementation will execute the parts serially.
* Also see avcodec_thread_init and e.g. the --enable-pthread configure option.
* @param c context passed also to func
* @param count the number of things to execute
* @param arg2 argument passed unchanged to func
* @param ret return values of executed functions, must have space for "count" values. May be NULL.
* @param func function that will be called count times, with jobnr from 0 to count-1.
* threadnr will be in the range 0 to c->thread_count-1 < MAX_THREADS and so that no
* two instances of func executing at the same time will have the same threadnr.
* @return always 0 currently, but code should handle a future improvement where when any call to func
* returns < 0 no further calls to func may be done and < 0 is returned.
* - encoding: Set by libavcodec, user can override.
* - decoding: Set by libavcodec, user can override.
*/
    int (*execute2)(struct AVCodecContext *c, int (*func)(struct AVCodecContext *c2, void *arg, int jobnr, int threadnr), void *arg2, int *ret, int count);

#if FF_API_X264_GLOBAL_OPTS
    /**
* explicit P-frame weighted prediction analysis method
* 0: off
* 1: fast blind weighting (one reference duplicate with -1 offset)
* 2: smart weighting (full fade detection analysis)
* - encoding: Set by user.
* - decoding: unused
*/
    attribute_deprecated int weighted_p_pred;

    /**
* AQ mode
* 0: Disabled
* 1: Variance AQ (complexity mask)
* 2: Auto-variance AQ (experimental)
* - encoding: Set by user
* - decoding: unused
*/
    attribute_deprecated int aq_mode;

    /**
* AQ strength
* Reduces blocking and blurring in flat and textured areas.
* - encoding: Set by user
* - decoding: unused
*/
    attribute_deprecated float aq_strength;

    /**
* PSY RD
* Strength of psychovisual optimization
* - encoding: Set by user
* - decoding: unused
*/
    attribute_deprecated float psy_rd;

    /**
* PSY trellis
* Strength of psychovisual optimization
* - encoding: Set by user
* - decoding: unused
*/
    attribute_deprecated float psy_trellis;

    /**
* RC lookahead
* Number of frames for frametype and ratecontrol lookahead
* - encoding: Set by user
* - decoding: unused
*/
    attribute_deprecated int rc_lookahead;

    /**
* Constant rate factor maximum
* With CRF encoding mode and VBV restrictions enabled, prevents quality from being worse
* than crf_max, even if doing so would violate VBV restrictions.
* - encoding: Set by user.
* - decoding: unused
*/
    attribute_deprecated float crf_max;
#endif

    int log_level_offset;

#if FF_API_FLAC_GLOBAL_OPTS
    /**
* Determine which LPC analysis algorithm to use.
* - encoding: Set by user
* - decoding: unused
*/
    attribute_deprecated enum AVLPCType lpc_type;

    /**
* Number of passes to use for Cholesky factorization during LPC analysis
* - encoding: Set by user
* - decoding: unused
*/
    attribute_deprecated int lpc_passes;
#endif

    /**
* Number of slices.
* Indicates number of picture subdivisions. Used for parallelized
* decoding.
* - encoding: Set by user
* - decoding: unused
*/
    int slices;

    /**
* Header containing style information for text subtitles.
* For SUBTITLE_ASS subtitle type, it should contain the whole ASS
* [Script Info] and [V4+ Styles] section, plus the [Events] line and
* the Format line following. It shouldn't include any Dialogue line.
* - encoding: Set/allocated/freed by user (before avcodec_open2())
* - decoding: Set/allocated/freed by libavcodec (by avcodec_open2())
*/
    uint8_t *subtitle_header;
    int subtitle_header_size;

    /**
* Current packet as passed into the decoder, to avoid having
* to pass the packet into every function. Currently only valid
* inside lavc and get/release_buffer callbacks.
* - decoding: set by avcodec_decode_*, read by get_buffer() for setting pkt_pts
* - encoding: unused
*/
    AVPacket *pkt;

#if FF_API_INTERNAL_CONTEXT
    /**
* Whether this is a copy of the context which had init() called on it.
* This is used by multithreading - shared tables and picture pointers
* should be freed from the original context only.
* - encoding: Set by libavcodec.
* - decoding: Set by libavcodec.
*
* @deprecated this field has been moved to an internal context
*/
    attribute_deprecated int is_copy;
#endif

    /**
* Which multithreading methods to use.
* Use of FF_THREAD_FRAME will increase decoding delay by one frame per thread,
* so clients which cannot provide future frames should not use it.
*
* - encoding: Set by user, otherwise the default is used.
* - decoding: Set by user, otherwise the default is used.
*/
    int thread_type;
#define FF_THREAD_FRAME 1 ///< Decode more than one frame at once
#define FF_THREAD_SLICE 2 ///< Decode more than one part of a single frame at once

    /**
* Which multithreading methods are in use by the codec.
* - encoding: Set by libavcodec.
* - decoding: Set by libavcodec.
*/
    int active_thread_type;

    /**
* Set by the client if its custom get_buffer() callback can be called
* from another thread, which allows faster multithreaded decoding.
* draw_horiz_band() will be called from other threads regardless of this setting.
* Ignored if the default get_buffer() is used.
* - encoding: Set by user.
* - decoding: Set by user.
*/
    int thread_safe_callbacks;

    /**
* VBV delay coded in the last frame (in periods of a 27 MHz clock).
* Used for compliant TS muxing.
* - encoding: Set by libavcodec.
* - decoding: unused.
*/
    uint64_t vbv_delay;

    /**
* Type of service that the audio stream conveys.
* - encoding: Set by user.
* - decoding: Set by libavcodec.
*/
    enum AVAudioServiceType audio_service_type;

    /**
* Used to request a sample format from the decoder.
* - encoding: unused.
* - decoding: Set by user.
*/
    enum AVSampleFormat request_sample_fmt;

    /**
* Error recognition; may misdetect some more or less valid parts as errors.
* - encoding: unused
* - decoding: Set by user.
*/
    int err_recognition;
#define AV_EF_CRCCHECK (1<<0)
#define AV_EF_BITSTREAM (1<<1)
#define AV_EF_BUFFER (1<<2)
#define AV_EF_EXPLODE (1<<3)

    /**
* Private context used for internal data.
*
* Unlike priv_data, this is not codec-specific. It is used in general
* libavcodec functions.
*/
    struct AVCodecInternal *internal;
} AVCodecContext;

/**
* AVProfile.
*/
typedef struct AVProfile {
    int profile;
    const char *name; ///< short name for the profile
} AVProfile;

typedef struct AVCodecDefault AVCodecDefault;

/**
* AVCodec.
*/
typedef struct AVCodec {
    /**
* Name of the codec implementation.
* The name is globally unique among encoders and among decoders (but an
* encoder and a decoder can share the same name).
* This is the primary way to find a codec from the user perspective.
*/
    const char *name;
    enum AVMediaType type;
    enum CodecID id;
    int priv_data_size;
    int (*init)(AVCodecContext *);
    int (*encode)(AVCodecContext *, uint8_t *buf, int buf_size, void *data);
    int (*close)(AVCodecContext *);
    int (*decode)(AVCodecContext *, void *outdata, int *outdata_size, AVPacket *avpkt);
    /**
* Codec capabilities.
* see CODEC_CAP_*
*/
    int capabilities;
    struct AVCodec *next;
    /**
* Flush buffers.
* Will be called when seeking
*/
    void (*flush)(AVCodecContext *);
    const AVRational *supported_framerates; ///< array of supported framerates, or NULL if any, array is terminated by {0,0}
    const enum PixelFormat *pix_fmts; ///< array of supported pixel formats, or NULL if unknown, array is terminated by -1
    /**
* Descriptive name for the codec, meant to be more human readable than name.
* You should use the NULL_IF_CONFIG_SMALL() macro to define it.
*/
    const char *long_name;
    const int *supported_samplerates; ///< array of supported audio samplerates, or NULL if unknown, array is terminated by 0
    const enum AVSampleFormat *sample_fmts; ///< array of supported sample formats, or NULL if unknown, array is terminated by -1
    const uint64_t *channel_layouts; ///< array of support channel layouts, or NULL if unknown. array is terminated by 0
    uint8_t max_lowres; ///< maximum value for lowres supported by the decoder
    const AVClass *priv_class; ///< AVClass for the private context
    const AVProfile *profiles; ///< array of recognized profiles, or NULL if unknown, array is terminated by {FF_PROFILE_UNKNOWN}

    /**
* @name Frame-level threading support functions
* @{
*/
    /**
* If defined, called on thread contexts when they are created.
* If the codec allocates writable tables in init(), re-allocate them here.
* priv_data will be set to a copy of the original.
*/
    int (*init_thread_copy)(AVCodecContext *);
    /**
* Copy necessary context variables from a previous thread context to the current one.
* If not defined, the next thread will start automatically; otherwise, the codec
* must call ff_thread_finish_setup().
*
* dst and src will (rarely) point to the same context, in which case memcpy should be skipped.
*/
    int (*update_thread_context)(AVCodecContext *dst, const AVCodecContext *src);
    /** @} */

    /**
* Private codec-specific defaults.
*/
    const AVCodecDefault *defaults;

    /**
* Initialize codec static data, called from avcodec_register().
*/
    void (*init_static_data)(struct AVCodec *codec);
} AVCodec;

/**
* AVHWAccel.
*/
typedef struct AVHWAccel {
    /**
* Name of the hardware accelerated codec.
* The name is globally unique among encoders and among decoders (but an
* encoder and a decoder can share the same name).
*/
    const char *name;

    /**
* Type of codec implemented by the hardware accelerator.
*
* See AVMEDIA_TYPE_xxx
*/
    enum AVMediaType type;

    /**
* Codec implemented by the hardware accelerator.
*
* See CODEC_ID_xxx
*/
    enum CodecID id;

    /**
* Supported pixel format.
*
* Only hardware accelerated formats are supported here.
*/
    enum PixelFormat pix_fmt;

    /**
* Hardware accelerated codec capabilities.
* see FF_HWACCEL_CODEC_CAP_*
*/
    int capabilities;

    struct AVHWAccel *next;

    /**
* Called at the beginning of each frame or field picture.
*
* Meaningful frame information (codec specific) is guaranteed to
* be parsed at this point. This function is mandatory.
*
* Note that buf can be NULL along with buf_size set to 0.
* Otherwise, this means the whole frame is available at this point.
*
* @param avctx the codec context
* @param buf the frame data buffer base
* @param buf_size the size of the frame in bytes
* @return zero if successful, a negative value otherwise
*/
    int (*start_frame)(AVCodecContext *avctx, const uint8_t *buf, uint32_t buf_size);

    /**
* Callback for each slice.
*
* Meaningful slice information (codec specific) is guaranteed to
* be parsed at this point. This function is mandatory.
*
* @param avctx the codec context
* @param buf the slice data buffer base
* @param buf_size the size of the slice in bytes
* @return zero if successful, a negative value otherwise
*/
    int (*decode_slice)(AVCodecContext *avctx, const uint8_t *buf, uint32_t buf_size);

    /**
* Called at the end of each frame or field picture.
*
* The whole picture is parsed at this point and can now be sent
* to the hardware accelerator. This function is mandatory.
*
* @param avctx the codec context
* @return zero if successful, a negative value otherwise
*/
    int (*end_frame)(AVCodecContext *avctx);

    /**
* Size of HW accelerator private data.
*
* Private data is allocated with av_mallocz() before
* AVCodecContext.get_buffer() and deallocated after
* AVCodecContext.release_buffer().
*/
    int priv_data_size;
} AVHWAccel;

/**
* four components are given, that's all.
* the last component is alpha
*/
typedef struct AVPicture {
    uint8_t *data[AV_NUM_DATA_POINTERS];
    int linesize[AV_NUM_DATA_POINTERS]; ///< number of bytes per line
} AVPicture;

#define AVPALETTE_SIZE 1024
#define AVPALETTE_COUNT 256
#if FF_API_PALETTE_CONTROL
/**
* AVPaletteControl
* This structure defines a method for communicating palette changes
* between and demuxer and a decoder.
*
* @deprecated Use AVPacket to send palette changes instead.
* This is totally broken.
*/
typedef struct AVPaletteControl {

    /* Demuxer sets this to 1 to indicate the palette has changed;
* decoder resets to 0. */
    int palette_changed;

    /* 4-byte ARGB palette entries, stored in native byte order; note that
* the individual palette components should be on a 8-bit scale; if
* the palette data comes from an IBM VGA native format, the component
* data is probably 6 bits in size and needs to be scaled. */
    unsigned int palette[AVPALETTE_COUNT];

} AVPaletteControl attribute_deprecated;
#endif

enum AVSubtitleType {
    SUBTITLE_NONE,

    SUBTITLE_BITMAP, ///< A bitmap, pict will be set

    /**
* Plain text, the text field must be set by the decoder and is
* authoritative. ass and pict fields may contain approximations.
*/
    SUBTITLE_TEXT,

    /**
* Formatted text, the ass field must be set by the decoder and is
* authoritative. pict and text fields may contain approximations.
*/
    SUBTITLE_ASS,
};

typedef struct AVSubtitleRect {
    int x; ///< top left corner of pict, undefined when pict is not set
    int y; ///< top left corner of pict, undefined when pict is not set
    int w; ///< width of pict, undefined when pict is not set
    int h; ///< height of pict, undefined when pict is not set
    int nb_colors; ///< number of colors in pict, undefined when pict is not set

    /**
* data+linesize for the bitmap of this subtitle.
* can be set for text/ass as well once they where rendered
*/
    AVPicture pict;
    enum AVSubtitleType type;

    char *text; ///< 0 terminated plain UTF-8 text

    /**
* 0 terminated ASS/SSA compatible event line.
* The pressentation of this is unaffected by the other values in this
* struct.
*/
    char *ass;
} AVSubtitleRect;

typedef struct AVSubtitle {
    uint16_t format; /* 0 = graphics */
    uint32_t start_display_time; /* relative to packet pts, in ms */
    uint32_t end_display_time; /* relative to packet pts, in ms */
    unsigned num_rects;
    AVSubtitleRect **rects;
    int64_t pts; ///< Same as packet pts, in AV_TIME_BASE
} AVSubtitle;

/* packet functions */

/**
* @deprecated use NULL instead
*/
attribute_deprecated void av_destruct_packet_nofree(AVPacket *pkt);

/**
* Default packet destructor.
*/
void av_destruct_packet(AVPacket *pkt);

/**
* Initialize optional fields of a packet with default values.
*
* @param pkt packet
*/
void av_init_packet(AVPacket *pkt);

/**
* Allocate the payload of a packet and initialize its fields with
* default values.
*
* @param pkt packet
* @param size wanted payload size
* @return 0 if OK, AVERROR_xxx otherwise
*/
int av_new_packet(AVPacket *pkt, int size);

/**
* Reduce packet size, correctly zeroing padding
*
* @param pkt packet
* @param size new size
*/
void av_shrink_packet(AVPacket *pkt, int size);

/**
* Increase packet size, correctly zeroing padding
*
* @param pkt packet
* @param grow_by number of bytes by which to increase the size of the packet
*/
int av_grow_packet(AVPacket *pkt, int grow_by);

/**
* @warning This is a hack - the packet memory allocation stuff is broken. The
* packet is allocated if it was not really allocated.
*/
int av_dup_packet(AVPacket *pkt);

/**
* Free a packet.
*
* @param pkt packet to free
*/
void av_free_packet(AVPacket *pkt);

/**
* Allocate new information of a packet.
*
* @param pkt packet
* @param type side information type
* @param size side information size
* @return pointer to fresh allocated data or NULL otherwise
*/
uint8_t* av_packet_new_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
                                 int size);

/**
* Get side information from packet.
*
* @param pkt packet
* @param type desired side information type
* @param size pointer for side information size to store (optional)
* @return pointer to data if present or NULL otherwise
*/
uint8_t* av_packet_get_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
                                 int *size);

/* resample.c */

struct ReSampleContext;
struct AVResampleContext;

typedef struct ReSampleContext ReSampleContext;

/**
* Initialize audio resampling context.
*
* @param output_channels number of output channels
* @param input_channels number of input channels
* @param output_rate output sample rate
* @param input_rate input sample rate
* @param sample_fmt_out requested output sample format
* @param sample_fmt_in input sample format
* @param filter_length length of each FIR filter in the filterbank relative to the cutoff frequency
* @param log2_phase_count log2 of the number of entries in the polyphase filterbank
* @param linear if 1 then the used FIR filter will be linearly interpolated
between the 2 closest, if 0 the closest will be used
* @param cutoff cutoff frequency, 1.0 corresponds to half the output sampling rate
* @return allocated ReSampleContext, NULL if error occurred
*/
ReSampleContext *av_audio_resample_init(int output_channels, int input_channels,
                                        int output_rate, int input_rate,
                                        enum AVSampleFormat sample_fmt_out,
                                        enum AVSampleFormat sample_fmt_in,
                                        int filter_length, int log2_phase_count,
                                        int linear, double cutoff);

int audio_resample(ReSampleContext *s, short *output, short *input, int nb_samples);

/**
* Free resample context.
*
* @param s a non-NULL pointer to a resample context previously
* created with av_audio_resample_init()
*/
void audio_resample_close(ReSampleContext *s);


/**
* Initialize an audio resampler.
* Note, if either rate is not an integer then simply scale both rates up so they are.
* @param filter_length length of each FIR filter in the filterbank relative to the cutoff freq
* @param log2_phase_count log2 of the number of entries in the polyphase filterbank
* @param linear If 1 then the used FIR filter will be linearly interpolated
between the 2 closest, if 0 the closest will be used
* @param cutoff cutoff frequency, 1.0 corresponds to half the output sampling rate
*/
struct AVResampleContext *av_resample_init(int out_rate, int in_rate, int filter_length, int log2_phase_count, int linear, double cutoff);

/**
* Resample an array of samples using a previously configured context.
* @param src an array of unconsumed samples
* @param consumed the number of samples of src which have been consumed are returned here
* @param src_size the number of unconsumed samples available
* @param dst_size the amount of space in samples available in dst
* @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.
* @return the number of samples written in dst or -1 if an error occurred
*/
int av_resample(struct AVResampleContext *c, short *dst, short *src, int *consumed, int src_size, int dst_size, int update_ctx);


/**
* Compensate samplerate/timestamp drift. The compensation is done by changing
* the resampler parameters, so no audible clicks or similar distortions occur
* @param compensation_distance distance in output samples over which the compensation should be performed
* @param sample_delta number of output samples which should be output less
*
* example: av_resample_compensate(c, 10, 500)
* here instead of 510 samples only 500 samples would be output
*
* note, due to rounding the actual compensation might be slightly different,
* especially if the compensation_distance is large and the in_rate used during init is small
*/
void av_resample_compensate(struct AVResampleContext *c, int sample_delta, int compensation_distance);
void av_resample_close(struct AVResampleContext *c);

/**
* Allocate memory for a picture. Call avpicture_free() to free it.
*
* @see avpicture_fill()
*
* @param picture the picture to be filled in
* @param pix_fmt the format of the picture
* @param width the width of the picture
* @param height the height of the picture
* @return zero if successful, a negative value if not
*/
int avpicture_alloc(AVPicture *picture, enum PixelFormat pix_fmt, int width, int height);

/**
* Free a picture previously allocated by avpicture_alloc().
* The data buffer used by the AVPicture is freed, but the AVPicture structure
* itself is not.
*
* @param picture the AVPicture to be freed
*/
void avpicture_free(AVPicture *picture);

/**
* Fill in the AVPicture fields.
* The fields of the given AVPicture are filled in by using the 'ptr' address
* which points to the image data buffer. Depending on the specified picture
* format, one or multiple image data pointers and line sizes will be set.
* If a planar format is specified, several pointers will be set pointing to
* the different picture planes and the line sizes of the different planes
* will be stored in the lines_sizes array.
* Call with ptr == NULL to get the required size for the ptr buffer.
*
* To allocate the buffer and fill in the AVPicture fields in one call,
* use avpicture_alloc().
*
* @param picture AVPicture whose fields are to be filled in
* @param ptr Buffer which will contain or contains the actual image data
* @param pix_fmt The format in which the picture data is stored.
* @param width the width of the image in pixels
* @param height the height of the image in pixels
* @return size of the image data in bytes
*/
int avpicture_fill(AVPicture *picture, uint8_t *ptr,
                   enum PixelFormat pix_fmt, int width, int height);

/**
* Copy pixel data from an AVPicture into a buffer.
* The data is stored compactly, without any gaps for alignment or padding
* which may be applied by avpicture_fill().
*
* @see avpicture_get_size()
*
* @param[in] src AVPicture containing image data
* @param[in] pix_fmt The format in which the picture data is stored.
* @param[in] width the width of the image in pixels.
* @param[in] height the height of the image in pixels.
* @param[out] dest A buffer into which picture data will be copied.
* @param[in] dest_size The size of 'dest'.
* @return The number of bytes written to dest, or a negative value (error code) on error.
*/
int avpicture_layout(const AVPicture* src, enum PixelFormat pix_fmt, int width, int height,
                     unsigned char *dest, int dest_size);

/**
* Calculate the size in bytes that a picture of the given width and height
* would occupy if stored in the given picture format.
* Note that this returns the size of a compact representation as generated
* by avpicture_layout(), which can be smaller than the size required for e.g.
* avpicture_fill().
*
* @param pix_fmt the given picture format
* @param width the width of the image
* @param height the height of the image
* @return Image data size in bytes or -1 on error (e.g. too large dimensions).
*/
int avpicture_get_size(enum PixelFormat pix_fmt, int width, int height);
void avcodec_get_chroma_sub_sample(enum PixelFormat pix_fmt, int *h_shift, int *v_shift);

#if FF_API_GET_PIX_FMT_NAME
/**
* @deprecated Deprecated in favor of av_get_pix_fmt_name().
*/
attribute_deprecated
const char *avcodec_get_pix_fmt_name(enum PixelFormat pix_fmt);
#endif

void avcodec_set_dimensions(AVCodecContext *s, int width, int height);

/**
* Return a value representing the fourCC code associated to the
* pixel format pix_fmt, or 0 if no associated fourCC code can be
* found.
*/
unsigned int avcodec_pix_fmt_to_codec_tag(enum PixelFormat pix_fmt);

/**
* Put a string representing the codec tag codec_tag in buf.
*
* @param buf_size size in bytes of buf
* @return the length of the string that would have been generated if
* enough space had been available, excluding the trailing null
*/
size_t av_get_codec_tag_string(char *buf, size_t buf_size, unsigned int codec_tag);

#define FF_LOSS_RESOLUTION 0x0001 /**< loss due to resolution change */
#define FF_LOSS_DEPTH 0x0002 /**< loss due to color depth change */
#define FF_LOSS_COLORSPACE 0x0004 /**< loss due to color space conversion */
#define FF_LOSS_ALPHA 0x0008 /**< loss of alpha bits */
#define FF_LOSS_COLORQUANT 0x0010 /**< loss due to color quantization */
#define FF_LOSS_CHROMA 0x0020 /**< loss of chroma (e.g. RGB to gray conversion) */

/**
* Compute what kind of losses will occur when converting from one specific
* pixel format to another.
* When converting from one pixel format to another, information loss may occur.
* For example, when converting from RGB24 to GRAY, the color information will
* be lost. Similarly, other losses occur when converting from some formats to
* other formats. These losses can involve loss of chroma, but also loss of
* resolution, loss of color depth, loss due to the color space conversion, loss
* of the alpha bits or loss due to color quantization.
* avcodec_get_fix_fmt_loss() informs you about the various types of losses
* which will occur when converting from one pixel format to another.
*
* @param[in] dst_pix_fmt destination pixel format
* @param[in] src_pix_fmt source pixel format
* @param[in] has_alpha Whether the source pixel format alpha channel is used.
* @return Combination of flags informing you what kind of losses will occur.
*/
int avcodec_get_pix_fmt_loss(enum PixelFormat dst_pix_fmt, enum PixelFormat src_pix_fmt,
                             int has_alpha);

/**
* Find the best pixel format to convert to given a certain source pixel
* format. When converting from one pixel format to another, information loss
* may occur. For example, when converting from RGB24 to GRAY, the color
* information will be lost. Similarly, other losses occur when converting from
* some formats to other formats. avcodec_find_best_pix_fmt() searches which of
* the given pixel formats should be used to suffer the least amount of loss.
* The pixel formats from which it chooses one, are determined by the
* pix_fmt_mask parameter.
*
* @code
* src_pix_fmt = PIX_FMT_YUV420P;
* pix_fmt_mask = (1 << PIX_FMT_YUV422P) || (1 << PIX_FMT_RGB24);
* dst_pix_fmt = avcodec_find_best_pix_fmt(pix_fmt_mask, src_pix_fmt, alpha, &loss);
* @endcode
*
* @param[in] pix_fmt_mask bitmask determining which pixel format to choose from
* @param[in] src_pix_fmt source pixel format
* @param[in] has_alpha Whether the source pixel format alpha channel is used.
* @param[out] loss_ptr Combination of flags informing you what kind of losses will occur.
* @return The best pixel format to convert to or -1 if none was found.
*/
enum PixelFormat avcodec_find_best_pix_fmt(int64_t pix_fmt_mask, enum PixelFormat src_pix_fmt,
                              int has_alpha, int *loss_ptr);

#if FF_API_GET_ALPHA_INFO
#define FF_ALPHA_TRANSP 0x0001 /* image has some totally transparent pixels */
#define FF_ALPHA_SEMI_TRANSP 0x0002 /* image has some transparent pixels */

/**
* Tell if an image really has transparent alpha values.
* @return ored mask of FF_ALPHA_xxx constants
*/
attribute_deprecated
int img_get_alpha_info(const AVPicture *src,
                       enum PixelFormat pix_fmt, int width, int height);
#endif

/* deinterlace a picture */
/* deinterlace - if not supported return -1 */
int avpicture_deinterlace(AVPicture *dst, const AVPicture *src,
                          enum PixelFormat pix_fmt, int width, int height);

/* external high level API */

/**
* If c is NULL, returns the first registered codec,
* if c is non-NULL, returns the next registered codec after c,
* or NULL if c is the last one.
*/
AVCodec *av_codec_next(AVCodec *c);

/**
* Return the LIBAVCODEC_VERSION_INT constant.
*/
unsigned avcodec_version(void);

/**
* Return the libavcodec build-time configuration.
*/
const char *avcodec_configuration(void);

/**
* Return the libavcodec license.
*/
const char *avcodec_license(void);

#if FF_API_AVCODEC_INIT
/**
* @deprecated this function is called automatically from avcodec_register()
* and avcodec_register_all(), there is no need to call it manually
*/
attribute_deprecated
void avcodec_init(void);
#endif

/**
* Register the codec codec and initialize libavcodec.
*
* @warning either this function or avcodec_register_all() must be called
* before any other libavcodec functions.
*
* @see avcodec_register_all()
*/
void avcodec_register(AVCodec *codec);

/**
* Find a registered encoder with a matching codec ID.
*
* @param id CodecID of the requested encoder
* @return An encoder if one was found, NULL otherwise.
*/
AVCodec *avcodec_find_encoder(enum CodecID id);

/**
* Find a registered encoder with the specified name.
*
* @param name name of the requested encoder
* @return An encoder if one was found, NULL otherwise.
*/
AVCodec *avcodec_find_encoder_by_name(const char *name);

/**
* Find a registered decoder with a matching codec ID.
*
* @param id CodecID of the requested decoder
* @return A decoder if one was found, NULL otherwise.
*/
AVCodec *avcodec_find_decoder(enum CodecID id);

/**
* Find a registered decoder with the specified name.
*
* @param name name of the requested decoder
* @return A decoder if one was found, NULL otherwise.
*/
AVCodec *avcodec_find_decoder_by_name(const char *name);
void avcodec_string(char *buf, int buf_size, AVCodecContext *enc, int encode);

/**
* Return a name for the specified profile, if available.
*
* @param codec the codec that is searched for the given profile
* @param profile the profile value for which a name is requested
* @return A name for the profile if found, NULL otherwise.
*/
const char *av_get_profile_name(const AVCodec *codec, int profile);

#if FF_API_ALLOC_CONTEXT
/**
* Set the fields of the given AVCodecContext to default values.
*
* @param s The AVCodecContext of which the fields should be set to default values.
* @deprecated use avcodec_get_context_defaults3
*/
attribute_deprecated
void avcodec_get_context_defaults(AVCodecContext *s);

/** THIS FUNCTION IS NOT YET PART OF THE PUBLIC API!
* we WILL change its arguments and name a few times! */
attribute_deprecated
void avcodec_get_context_defaults2(AVCodecContext *s, enum AVMediaType);
#endif

/**
* Set the fields of the given AVCodecContext to default values corresponding
* to the given codec (defaults may be codec-dependent).
*
* Do not call this function if a non-NULL codec has been passed
* to avcodec_alloc_context3() that allocated this AVCodecContext.
* If codec is non-NULL, it is illegal to call avcodec_open2() with a
* different codec on this AVCodecContext.
*/
int avcodec_get_context_defaults3(AVCodecContext *s, AVCodec *codec);

#if FF_API_ALLOC_CONTEXT
/**
* Allocate an AVCodecContext and set its fields to default values. The
* resulting struct can be deallocated by simply calling av_free().
*
* @return An AVCodecContext filled with default values or NULL on failure.
* @see avcodec_get_context_defaults
*
* @deprecated use avcodec_alloc_context3()
*/
attribute_deprecated
AVCodecContext *avcodec_alloc_context(void);

/** THIS FUNCTION IS NOT YET PART OF THE PUBLIC API!
* we WILL change its arguments and name a few times! */
attribute_deprecated
AVCodecContext *avcodec_alloc_context2(enum AVMediaType);
#endif

/**
* Allocate an AVCodecContext and set its fields to default values. The
* resulting struct can be deallocated by simply calling av_free().
*
* @param codec if non-NULL, allocate private data and initialize defaults
* for the given codec. It is illegal to then call avcodec_open2()
* with a different codec.
*
* @return An AVCodecContext filled with default values or NULL on failure.
* @see avcodec_get_context_defaults
*/
AVCodecContext *avcodec_alloc_context3(AVCodec *codec);

/**
* Copy the settings of the source AVCodecContext into the destination
* AVCodecContext. The resulting destination codec context will be
* unopened, i.e. you are required to call avcodec_open2() before you
* can use this AVCodecContext to decode/encode video/audio data.
*
* @param dest target codec context, should be initialized with
* avcodec_alloc_context3(), but otherwise uninitialized
* @param src source codec context
* @return AVERROR() on error (e.g. memory allocation error), 0 on success
*/
int avcodec_copy_context(AVCodecContext *dest, const AVCodecContext *src);

/**
* Set the fields of the given AVFrame to default values.
*
* @param pic The AVFrame of which the fields should be set to default values.
*/
void avcodec_get_frame_defaults(AVFrame *pic);

/**
* Allocate an AVFrame and set its fields to default values. The resulting
* struct can be deallocated by simply calling av_free().
*
* @return An AVFrame filled with default values or NULL on failure.
* @see avcodec_get_frame_defaults
*/
AVFrame *avcodec_alloc_frame(void);

int avcodec_default_get_buffer(AVCodecContext *s, AVFrame *pic);
void avcodec_default_release_buffer(AVCodecContext *s, AVFrame *pic);
int avcodec_default_reget_buffer(AVCodecContext *s, AVFrame *pic);

/**
* Return the amount of padding in pixels which the get_buffer callback must
* provide around the edge of the image for codecs which do not have the
* CODEC_FLAG_EMU_EDGE flag.
*
* @return Required padding in pixels.
*/
unsigned avcodec_get_edge_width(void);
/**
* Modify width and height values so that they will result in a memory
* buffer that is acceptable for the codec if you do not use any horizontal
* padding.
*
* May only be used if a codec with CODEC_CAP_DR1 has been opened.
* If CODEC_FLAG_EMU_EDGE is not set, the dimensions must have been increased
* according to avcodec_get_edge_width() before.
*/
void avcodec_align_dimensions(AVCodecContext *s, int *width, int *height);
/**
* Modify width and height values so that they will result in a memory
* buffer that is acceptable for the codec if you also ensure that all
* line sizes are a multiple of the respective linesize_align[i].
*
* May only be used if a codec with CODEC_CAP_DR1 has been opened.
* If CODEC_FLAG_EMU_EDGE is not set, the dimensions must have been increased
* according to avcodec_get_edge_width() before.
*/
void avcodec_align_dimensions2(AVCodecContext *s, int *width, int *height,
                               int linesize_align[AV_NUM_DATA_POINTERS]);

enum PixelFormat avcodec_default_get_format(struct AVCodecContext *s, const enum PixelFormat * fmt);

#if FF_API_THREAD_INIT
/**
* @deprecated Set s->thread_count before calling avcodec_open2() instead of calling this.
*/
attribute_deprecated
int avcodec_thread_init(AVCodecContext *s, int thread_count);
#endif

int avcodec_default_execute(AVCodecContext *c, int (*func)(AVCodecContext *c2, void *arg2),void *arg, int *ret, int count, int size);
int avcodec_default_execute2(AVCodecContext *c, int (*func)(AVCodecContext *c2, void *arg2, int, int),void *arg, int *ret, int count);
//FIXME func typedef

#if FF_API_AVCODEC_OPEN
/**
* Initialize the AVCodecContext to use the given AVCodec. Prior to using this
* function the context has to be allocated.
*
* The functions avcodec_find_decoder_by_name(), avcodec_find_encoder_by_name(),
* avcodec_find_decoder() and avcodec_find_encoder() provide an easy way for
* retrieving a codec.
*
* @warning This function is not thread safe!
*
* @code
* avcodec_register_all();
* codec = avcodec_find_decoder(CODEC_ID_H264);
* if (!codec)
* exit(1);
*
* context = avcodec_alloc_context3(codec);
*
* if (avcodec_open(context, codec) < 0)
* exit(1);
* @endcode
*
* @param avctx The context which will be set up to use the given codec.
* @param codec The codec to use within the context.
* @return zero on success, a negative value on error
* @see avcodec_alloc_context3, avcodec_find_decoder, avcodec_find_encoder, avcodec_close
*
* @deprecated use avcodec_open2
*/
attribute_deprecated
int avcodec_open(AVCodecContext *avctx, AVCodec *codec);
#endif

/**
* Initialize the AVCodecContext to use the given AVCodec. Prior to using this
* function the context has to be allocated with avcodec_alloc_context3().
*
* The functions avcodec_find_decoder_by_name(), avcodec_find_encoder_by_name(),
* avcodec_find_decoder() and avcodec_find_encoder() provide an easy way for
* retrieving a codec.
*
* @warning This function is not thread safe!
*
* @code
* avcodec_register_all();
* av_dict_set(&opts, "b", "2.5M", 0);
* codec = avcodec_find_decoder(CODEC_ID_H264);
* if (!codec)
* exit(1);
*
* context = avcodec_alloc_context3(codec);
*
* if (avcodec_open2(context, codec, opts) < 0)
* exit(1);
* @endcode
*
* @param avctx The context to initialize.
* @param options A dictionary filled with AVCodecContext and codec-private options.
* On return this object will be filled with options that were not found.
*
* @return zero on success, a negative value on error
* @see avcodec_alloc_context3(), avcodec_find_decoder(), avcodec_find_encoder(),
* av_dict_set(), av_opt_find().
*/
int avcodec_open2(AVCodecContext *avctx, AVCodec *codec, AVDictionary **options);

#if FF_API_OLD_DECODE_AUDIO
/**
* Wrapper function which calls avcodec_decode_audio4.
*
* @deprecated Use avcodec_decode_audio4 instead.
*
* Decode the audio frame of size avpkt->size from avpkt->data into samples.
* Some decoders may support multiple frames in a single AVPacket, such
* decoders would then just decode the first frame. In this case,
* avcodec_decode_audio3 has to be called again with an AVPacket that contains
* the remaining data in order to decode the second frame etc.
* If no frame
* could be outputted, frame_size_ptr is zero. Otherwise, it is the
* decompressed frame size in bytes.
*
* @warning You must set frame_size_ptr to the allocated size of the
* output buffer before calling avcodec_decode_audio3().
*
* @warning The input buffer must be FF_INPUT_BUFFER_PADDING_SIZE larger than
* the actual read bytes because some optimized bitstream readers read 32 or 64
* bits at once and could read over the end.
*
* @warning The end of the input buffer avpkt->data should be set to 0 to ensure that
* no overreading happens for damaged MPEG streams.
*
* @note You might have to align the input buffer avpkt->data and output buffer
* samples. The alignment requirements depend on the CPU: On some CPUs it isn't
* necessary at all, on others it won't work at all if not aligned and on others
* it will work but it will have an impact on performance.
*
* In practice, avpkt->data should have 4 byte alignment at minimum and
* samples should be 16 byte aligned unless the CPU doesn't need it
* (AltiVec and SSE do).
*
* @note Codecs which have the CODEC_CAP_DELAY capability set have a delay
* between input and output, these need to be fed with avpkt->data=NULL,
* avpkt->size=0 at the end to return the remaining frames.
*
* @param avctx the codec context
* @param[out] samples the output buffer, sample type in avctx->sample_fmt
* If the sample format is planar, each channel plane will
* be the same size, with no padding between channels.
* @param[in,out] frame_size_ptr the output buffer size in bytes
* @param[in] avpkt The input AVPacket containing the input buffer.
* You can create such packet with av_init_packet() and by then setting
* data and size, some decoders might in addition need other fields.
* All decoders are designed to use the least fields possible though.
* @return On error a negative value is returned, otherwise the number of bytes
* used or zero if no frame data was decompressed (used) from the input AVPacket.
*/
attribute_deprecated int avcodec_decode_audio3(AVCodecContext *avctx, int16_t *samples,
                         int *frame_size_ptr,
                         AVPacket *avpkt);
#endif

/**
* Decode the audio frame of size avpkt->size from avpkt->data into frame.
*
* Some decoders may support multiple frames in a single AVPacket. Such
* decoders would then just decode the first frame. In this case,
* avcodec_decode_audio4 has to be called again with an AVPacket containing
* the remaining data in order to decode the second frame, etc...
* Even if no frames are returned, the packet needs to be fed to the decoder
* with remaining data until it is completely consumed or an error occurs.
*
* @warning The input buffer, avpkt->data must be FF_INPUT_BUFFER_PADDING_SIZE
* larger than the actual read bytes because some optimized bitstream
* readers read 32 or 64 bits at once and could read over the end.
*
* @note You might have to align the input buffer. The alignment requirements
* depend on the CPU and the decoder.
*
* @param avctx the codec context
* @param[out] frame The AVFrame in which to store decoded audio samples.
* Decoders request a buffer of a particular size by setting
* AVFrame.nb_samples prior to calling get_buffer(). The
* decoder may, however, only utilize part of the buffer by
* setting AVFrame.nb_samples to a smaller value in the
* output frame.
* @param[out] got_frame_ptr Zero if no frame could be decoded, otherwise it is
* non-zero.
* @param[in] avpkt The input AVPacket containing the input buffer.
* At least avpkt->data and avpkt->size should be set. Some
* decoders might also require additional fields to be set.
* @return A negative error code is returned if an error occurred during
* decoding, otherwise the number of bytes consumed from the input
* AVPacket is returned.
*/
int avcodec_decode_audio4(AVCodecContext *avctx, AVFrame *frame,
                          int *got_frame_ptr, AVPacket *avpkt);

/**
* Decode the video frame of size avpkt->size from avpkt->data into picture.
* Some decoders may support multiple frames in a single AVPacket, such
* decoders would then just decode the first frame.
*
* @warning The input buffer must be FF_INPUT_BUFFER_PADDING_SIZE larger than
* the actual read bytes because some optimized bitstream readers read 32 or 64
* bits at once and could read over the end.
*
* @warning The end of the input buffer buf should be set to 0 to ensure that
* no overreading happens for damaged MPEG streams.
*
* @note You might have to align the input buffer avpkt->data.
* The alignment requirements depend on the CPU: on some CPUs it isn't
* necessary at all, on others it won't work at all if not aligned and on others
* it will work but it will have an impact on performance.
*
* In practice, avpkt->data should have 4 byte alignment at minimum.
*
* @note Codecs which have the CODEC_CAP_DELAY capability set have a delay
* between input and output, these need to be fed with avpkt->data=NULL,
* avpkt->size=0 at the end to return the remaining frames.
*
* @param avctx the codec context
* @param[out] picture The AVFrame in which the decoded video frame will be stored.
* Use avcodec_alloc_frame to get an AVFrame, the codec will
* allocate memory for the actual bitmap.
* with default get/release_buffer(), the decoder frees/reuses the bitmap as it sees fit.
* with overridden get/release_buffer() (needs CODEC_CAP_DR1) the user decides into what buffer the decoder
* decodes and the decoder tells the user once it does not need the data anymore,
* the user app can at this point free/reuse/keep the memory as it sees fit.
*
* @param[in] avpkt The input AVpacket containing the input buffer.
* You can create such packet with av_init_packet() and by then setting
* data and size, some decoders might in addition need other fields like
* flags&AV_PKT_FLAG_KEY. All decoders are designed to use the least
* fields possible.
* @param[in,out] got_picture_ptr Zero if no frame could be decompressed, otherwise, it is nonzero.
* @return On error a negative value is returned, otherwise the number of bytes
* used or zero if no frame could be decompressed.
*/
int avcodec_decode_video2(AVCodecContext *avctx, AVFrame *picture,
                         int *got_picture_ptr,
                         AVPacket *avpkt);

/**
* Decode a subtitle message.
* Return a negative value on error, otherwise return the number of bytes used.
* If no subtitle could be decompressed, got_sub_ptr is zero.
* Otherwise, the subtitle is stored in *sub.
* Note that CODEC_CAP_DR1 is not available for subtitle codecs. This is for
* simplicity, because the performance difference is expect to be negligible
* and reusing a get_buffer written for video codecs would probably perform badly
* due to a potentially very different allocation pattern.
*
* @param avctx the codec context
* @param[out] sub The AVSubtitle in which the decoded subtitle will be stored, must be
freed with avsubtitle_free if *got_sub_ptr is set.
* @param[in,out] got_sub_ptr Zero if no subtitle could be decompressed, otherwise, it is nonzero.
* @param[in] avpkt The input AVPacket containing the input buffer.
*/
int avcodec_decode_subtitle2(AVCodecContext *avctx, AVSubtitle *sub,
                            int *got_sub_ptr,
                            AVPacket *avpkt);

/**
* Free all allocated data in the given subtitle struct.
*
* @param sub AVSubtitle to free.
*/
void avsubtitle_free(AVSubtitle *sub);

/**
* Encode an audio frame from samples into buf.
*
* @note The output buffer should be at least FF_MIN_BUFFER_SIZE bytes large.
* However, for PCM audio the user will know how much space is needed
* because it depends on the value passed in buf_size as described
* below. In that case a lower value can be used.
*
* @param avctx the codec context
* @param[out] buf the output buffer
* @param[in] buf_size the output buffer size
* @param[in] samples the input buffer containing the samples
* The number of samples read from this buffer is frame_size*channels,
* both of which are defined in avctx.
* For PCM audio the number of samples read from samples is equal to
* buf_size * input_sample_size / output_sample_size.
* @return On error a negative value is returned, on success zero or the number
* of bytes used to encode the data read from the input buffer.
*/
int avcodec_encode_audio(AVCodecContext *avctx, uint8_t *buf, int buf_size,
                         const short *samples);

/**
* Encode a video frame from pict into buf.
* The input picture should be
* stored using a specific format, namely avctx.pix_fmt.
*
* @param avctx the codec context
* @param[out] buf the output buffer for the bitstream of encoded frame
* @param[in] buf_size the size of the output buffer in bytes
* @param[in] pict the input picture to encode
* @return On error a negative value is returned, on success zero or the number
* of bytes used from the output buffer.
*/
int avcodec_encode_video(AVCodecContext *avctx, uint8_t *buf, int buf_size,
                         const AVFrame *pict);
int avcodec_encode_subtitle(AVCodecContext *avctx, uint8_t *buf, int buf_size,
                            const AVSubtitle *sub);

int avcodec_close(AVCodecContext *avctx);

/**
* Register all the codecs, parsers and bitstream filters which were enabled at
* configuration time. If you do not call this function you can select exactly
* which formats you want to support, by using the individual registration
* functions.
*
* @see avcodec_register
* @see av_register_codec_parser
* @see av_register_bitstream_filter
*/
void avcodec_register_all(void);

/**
* Flush buffers, should be called when seeking or when switching to a different stream.
*/
void avcodec_flush_buffers(AVCodecContext *avctx);

void avcodec_default_free_buffers(AVCodecContext *s);

/* misc useful functions */

#if FF_API_OLD_FF_PICT_TYPES
/**
* Return a single letter to describe the given picture type pict_type.
*
* @param[in] pict_type the picture type
* @return A single character representing the picture type.
* @deprecated Use av_get_picture_type_char() instead.
*/
attribute_deprecated
char av_get_pict_type_char(int pict_type);
#endif

/**
* Return codec bits per sample.
*
* @param[in] codec_id the codec
* @return Number of bits per sample or zero if unknown for the given codec.
*/
int av_get_bits_per_sample(enum CodecID codec_id);

#if FF_API_OLD_SAMPLE_FMT
/**
* @deprecated Use av_get_bytes_per_sample() instead.
*/
attribute_deprecated
int av_get_bits_per_sample_format(enum AVSampleFormat sample_fmt);
#endif

/* frame parsing */
typedef struct AVCodecParserContext {
    void *priv_data;
    struct AVCodecParser *parser;
    int64_t frame_offset; /* offset of the current frame */
    int64_t cur_offset; /* current offset
(incremented by each av_parser_parse()) */
    int64_t next_frame_offset; /* offset of the next frame */
    /* video info */
    int pict_type; /* XXX: Put it back in AVCodecContext. */
    /**
* This field is used for proper frame duration computation in lavf.
* It signals, how much longer the frame duration of the current frame
* is compared to normal frame duration.
*
* frame_duration = (1 + repeat_pict) * time_base
*
* It is used by codecs like H.264 to display telecined material.
*/
    int repeat_pict; /* XXX: Put it back in AVCodecContext. */
    int64_t pts; /* pts of the current frame */
    int64_t dts; /* dts of the current frame */

    /* private data */
    int64_t last_pts;
    int64_t last_dts;
    int fetch_timestamp;

#define AV_PARSER_PTS_NB 4
    int cur_frame_start_index;
    int64_t cur_frame_offset[AV_PARSER_PTS_NB];
    int64_t cur_frame_pts[AV_PARSER_PTS_NB];
    int64_t cur_frame_dts[AV_PARSER_PTS_NB];

    int flags;
#define PARSER_FLAG_COMPLETE_FRAMES 0x0001
#define PARSER_FLAG_ONCE 0x0002
/// Set if the parser has a valid file offset
#define PARSER_FLAG_FETCHED_OFFSET 0x0004

    int64_t offset; ///< byte offset from starting packet start
    int64_t cur_frame_end[AV_PARSER_PTS_NB];

    /**
* Set by parser to 1 for key frames and 0 for non-key frames.
* It is initialized to -1, so if the parser doesn't set this flag,
* old-style fallback using AV_PICTURE_TYPE_I picture type as key frames
* will be used.
*/
    int key_frame;

    /**
* Time difference in stream time base units from the pts of this
* packet to the point at which the output from the decoder has converged
* independent from the availability of previous frames. That is, the
* frames are virtually identical no matter if decoding started from
* the very first frame or from this keyframe.
* Is AV_NOPTS_VALUE if unknown.
* This field is not the display duration of the current frame.
* This field has no meaning if the packet does not have AV_PKT_FLAG_KEY
* set.
*
* The purpose of this field is to allow seeking in streams that have no
* keyframes in the conventional sense. It corresponds to the
* recovery point SEI in H.264 and match_time_delta in NUT. It is also
* essential for some types of subtitle streams to ensure that all
* subtitles are correctly displayed after seeking.
*/
    int64_t convergence_duration;

    // Timestamp generation support:
    /**
* Synchronization point for start of timestamp generation.
*
* Set to >0 for sync point, 0 for no sync point and <0 for undefined
* (default).
*
* For example, this corresponds to presence of H.264 buffering period
* SEI message.
*/
    int dts_sync_point;

    /**
* Offset of the current timestamp against last timestamp sync point in
* units of AVCodecContext.time_base.
*
* Set to INT_MIN when dts_sync_point unused. Otherwise, it must
* contain a valid timestamp offset.
*
* Note that the timestamp of sync point has usually a nonzero
* dts_ref_dts_delta, which refers to the previous sync point. Offset of
* the next frame after timestamp sync point will be usually 1.
*
* For example, this corresponds to H.264 cpb_removal_delay.
*/
    int dts_ref_dts_delta;

    /**
* Presentation delay of current frame in units of AVCodecContext.time_base.
*
* Set to INT_MIN when dts_sync_point unused. Otherwise, it must
* contain valid non-negative timestamp delta (presentation time of a frame
* must not lie in the past).
*
* This delay represents the difference between decoding and presentation
* time of the frame.
*
* For example, this corresponds to H.264 dpb_output_delay.
*/
    int pts_dts_delta;

    /**
* Position of the packet in file.
*
* Analogous to cur_frame_pts/dts
*/
    int64_t cur_frame_pos[AV_PARSER_PTS_NB];

    /**
* Byte position of currently parsed frame in stream.
*/
    int64_t pos;

    /**
* Previous frame byte position.
*/
    int64_t last_pos;
} AVCodecParserContext;

typedef struct AVCodecParser {
    int codec_ids[5]; /* several codec IDs are permitted */
    int priv_data_size;
    int (*parser_init)(AVCodecParserContext *s);
    int (*parser_parse)(AVCodecParserContext *s,
                        AVCodecContext *avctx,
                        const uint8_t **poutbuf, int *poutbuf_size,
                        const uint8_t *buf, int buf_size);
    void (*parser_close)(AVCodecParserContext *s);
    int (*split)(AVCodecContext *avctx, const uint8_t *buf, int buf_size);
    struct AVCodecParser *next;
} AVCodecParser;

AVCodecParser *av_parser_next(AVCodecParser *c);

void av_register_codec_parser(AVCodecParser *parser);
AVCodecParserContext *av_parser_init(int codec_id);

/**
* Parse a packet.
*
* @param s parser context.
* @param avctx codec context.
* @param poutbuf set to pointer to parsed buffer or NULL if not yet finished.
* @param poutbuf_size set to size of parsed buffer or zero if not yet finished.
* @param buf input buffer.
* @param buf_size input length, to signal EOF, this should be 0 (so that the last frame can be output).
* @param pts input presentation timestamp.
* @param dts input decoding timestamp.
* @param pos input byte position in stream.
* @return the number of bytes of the input bitstream used.
*
* Example:
* @code
* while(in_len){
* len = av_parser_parse2(myparser, AVCodecContext, &data, &size,
* in_data, in_len,
* pts, dts, pos);
* in_data += len;
* in_len -= len;
*
* if(size)
* decode_frame(data, size);
* }
* @endcode
*/
int av_parser_parse2(AVCodecParserContext *s,
                     AVCodecContext *avctx,
                     uint8_t **poutbuf, int *poutbuf_size,
                     const uint8_t *buf, int buf_size,
                     int64_t pts, int64_t dts,
                     int64_t pos);

int av_parser_change(AVCodecParserContext *s,
                     AVCodecContext *avctx,
                     uint8_t **poutbuf, int *poutbuf_size,
                     const uint8_t *buf, int buf_size, int keyframe);
void av_parser_close(AVCodecParserContext *s);


typedef struct AVBitStreamFilterContext {
    void *priv_data;
    struct AVBitStreamFilter *filter;
    AVCodecParserContext *parser;
    struct AVBitStreamFilterContext *next;
} AVBitStreamFilterContext;


typedef struct AVBitStreamFilter {
    const char *name;
    int priv_data_size;
    int (*filter)(AVBitStreamFilterContext *bsfc,
                  AVCodecContext *avctx, const char *args,
                  uint8_t **poutbuf, int *poutbuf_size,
                  const uint8_t *buf, int buf_size, int keyframe);
    void (*close)(AVBitStreamFilterContext *bsfc);
    struct AVBitStreamFilter *next;
} AVBitStreamFilter;

void av_register_bitstream_filter(AVBitStreamFilter *bsf);
AVBitStreamFilterContext *av_bitstream_filter_init(const char *name);
int av_bitstream_filter_filter(AVBitStreamFilterContext *bsfc,
                               AVCodecContext *avctx, const char *args,
                               uint8_t **poutbuf, int *poutbuf_size,
                               const uint8_t *buf, int buf_size, int keyframe);
void av_bitstream_filter_close(AVBitStreamFilterContext *bsf);

AVBitStreamFilter *av_bitstream_filter_next(AVBitStreamFilter *f);

/* memory */

/**
* Reallocate the given block if it is not large enough, otherwise do nothing.
*
* @see av_realloc
*/
void *av_fast_realloc(void *ptr, unsigned int *size, size_t min_size);

/**
* Allocate a buffer, reusing the given one if large enough.
*
* Contrary to av_fast_realloc the current buffer contents might not be
* preserved and on error the old buffer is freed, thus no special
* handling to avoid memleaks is necessary.
*
* @param ptr pointer to pointer to already allocated buffer, overwritten with pointer to new buffer
* @param size size of the buffer *ptr points to
* @param min_size minimum size of *ptr buffer after returning, *ptr will be NULL and
* *size 0 if an error occurred.
*/
void av_fast_malloc(void *ptr, unsigned int *size, size_t min_size);

/**
* Copy image src to dst. Wraps av_picture_data_copy() above.
*/
void av_picture_copy(AVPicture *dst, const AVPicture *src,
                     enum PixelFormat pix_fmt, int width, int height);

/**
* Crop image top and left side.
*/
int av_picture_crop(AVPicture *dst, const AVPicture *src,
                    enum PixelFormat pix_fmt, int top_band, int left_band);

/**
* Pad image.
*/
int av_picture_pad(AVPicture *dst, const AVPicture *src, int height, int width, enum PixelFormat pix_fmt,
            int padtop, int padbottom, int padleft, int padright, int *color);

/**
* Encode extradata length to a buffer. Used by xiph codecs.
*
* @param s buffer to write to; must be at least (v/255+1) bytes long
* @param v size of extradata in bytes
* @return number of bytes written to the buffer.
*/
unsigned int av_xiphlacing(unsigned char *s, unsigned int v);

/**
* Log a generic warning message about a missing feature. This function is
* intended to be used internally by Libav (libavcodec, libavformat, etc.)
* only, and would normally not be used by applications.
* @param[in] avc a pointer to an arbitrary struct of which the first field is
* a pointer to an AVClass struct
* @param[in] feature string containing the name of the missing feature
* @param[in] want_sample indicates if samples are wanted which exhibit this feature.
* If want_sample is non-zero, additional verbage will be added to the log
* message which tells the user how to report samples to the development
* mailing list.
*/
void av_log_missing_feature(void *avc, const char *feature, int want_sample);

/**
* Log a generic warning message asking for a sample. This function is
* intended to be used internally by Libav (libavcodec, libavformat, etc.)
* only, and would normally not be used by applications.
* @param[in] avc a pointer to an arbitrary struct of which the first field is
* a pointer to an AVClass struct
* @param[in] msg string containing an optional message, or NULL if no message
*/
void av_log_ask_for_sample(void *avc, const char *msg, ...) av_printf_format(2, 3);

/**
* Register the hardware accelerator hwaccel.
*/
void av_register_hwaccel(AVHWAccel *hwaccel);

/**
* If hwaccel is NULL, returns the first registered hardware accelerator,
* if hwaccel is non-NULL, returns the next registered hardware accelerator
* after hwaccel, or NULL if hwaccel is the last one.
*/
AVHWAccel *av_hwaccel_next(AVHWAccel *hwaccel);


/**
* Lock operation used by lockmgr
*/
enum AVLockOp {
  AV_LOCK_CREATE, ///< Create a mutex
  AV_LOCK_OBTAIN, ///< Lock the mutex
  AV_LOCK_RELEASE, ///< Unlock the mutex
  AV_LOCK_DESTROY, ///< Free mutex resources
};

/**
* Register a user provided lock manager supporting the operations
* specified by AVLockOp. mutex points to a (void *) where the
* lockmgr should store/get a pointer to a user allocated mutex. It's
* NULL upon AV_LOCK_CREATE and != NULL for all other ops.
*
* @param cb User defined callback. Note: Libav may invoke calls to this
* callback during the call to av_lockmgr_register().
* Thus, the application must be prepared to handle that.
* If cb is set to NULL the lockmgr will be unregistered.
* Also note that during unregistration the previously registered
* lockmgr callback may also be invoked.
*/
int av_lockmgr_register(int (*cb)(void **mutex, enum AVLockOp op));

/**
* Get the type of the given codec.
*/
enum AVMediaType avcodec_get_type(enum CodecID codec_id);

/**
* Get the AVClass for AVCodecContext. It can be used in combination with
* AV_OPT_SEARCH_FAKE_OBJ for examining options.
*
* @see av_opt_find().
*/
const AVClass *avcodec_get_class(void);

#endif /* AVCODEC_AVCODEC_H */
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