/*
  * copyright (c) 2001 Fabrice Bellard
  *

  * This file is part of FFmpeg.
  *
  * FFmpeg 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.

  *

  * FFmpeg 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 FFmpeg; 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 libavcodec/avcodec.h

  * external API header

  */
 

 #include <errno.h>

 #include "libavutil/avutil.h"

 #define LIBAVCODEC_VERSION_MAJOR 52

 #define LIBAVCODEC_VERSION_MINOR 20

 #define LIBAVCODEC_VERSION_MICRO  1

 #define LIBAVCODEC_VERSION_INT  AV_VERSION_INT(LIBAVCODEC_VERSION_MAJOR, \
                                                LIBAVCODEC_VERSION_MINOR, \
                                                LIBAVCODEC_VERSION_MICRO)
 #define LIBAVCODEC_VERSION      AV_VERSION(LIBAVCODEC_VERSION_MAJOR,    \
                                            LIBAVCODEC_VERSION_MINOR,    \
                                            LIBAVCODEC_VERSION_MICRO)

 #define LIBAVCODEC_BUILD        LIBAVCODEC_VERSION_INT

 #define LIBAVCODEC_IDENT        "Lavc" AV_STRINGIFY(LIBAVCODEC_VERSION)

 #define AV_NOPTS_VALUE          INT64_C(0x8000000000000000)

 #define AV_TIME_BASE            1000000
 #define AV_TIME_BASE_Q          (AVRational){1, AV_TIME_BASE}

 /**

  * Identifies 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_XVID,
     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,

     CODEC_ID_FFH264,

     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,

     CODEC_ID_8SVX_EXP,
     CODEC_ID_8SVX_FIB,

     CODEC_ID_ESCAPE124,

     CODEC_ID_DIRAC,

     CODEC_ID_BFI,

     CODEC_ID_CMV,

     CODEC_ID_MOTIONPIXELS,

     CODEC_ID_TGV,

     CODEC_ID_TGQ,

     CODEC_ID_TQI,

     /* various PCM "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,

     /* 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,

     /* 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,
     CODEC_ID_SONIC,
     CODEC_ID_SONIC_LS,

     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,

     /* 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,

     /* other specific kind of codecs (generally used for attachments) */

     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) */

 };

 enum CodecType {

     CODEC_TYPE_UNKNOWN = -1,

     CODEC_TYPE_VIDEO,
     CODEC_TYPE_AUDIO,

     CODEC_TYPE_DATA,

     CODEC_TYPE_SUBTITLE,

     CODEC_TYPE_ATTACHMENT,

     CODEC_TYPE_NB

 };
 

 /**
  * all in native-endian format
  */

 enum SampleFormat {

     SAMPLE_FMT_NONE = -1,

     SAMPLE_FMT_U8,              ///< unsigned 8 bits
     SAMPLE_FMT_S16,             ///< signed 16 bits

     SAMPLE_FMT_S32,             ///< signed 32 bits

     SAMPLE_FMT_FLT,             ///< float

     SAMPLE_FMT_DBL,             ///< double

     SAMPLE_FMT_NB               ///< Number of sample formats. DO NOT USE if dynamically linking to libavcodec

 };
 

 /* Audio channel masks */

 #define CH_FRONT_LEFT             0x00000001
 #define CH_FRONT_RIGHT            0x00000002
 #define CH_FRONT_CENTER           0x00000004
 #define CH_LOW_FREQUENCY          0x00000008
 #define CH_BACK_LEFT              0x00000010
 #define CH_BACK_RIGHT             0x00000020
 #define CH_FRONT_LEFT_OF_CENTER   0x00000040
 #define CH_FRONT_RIGHT_OF_CENTER  0x00000080
 #define CH_BACK_CENTER            0x00000100
 #define CH_SIDE_LEFT              0x00000200
 #define CH_SIDE_RIGHT             0x00000400
 #define CH_TOP_CENTER             0x00000800
 #define CH_TOP_FRONT_LEFT         0x00001000
 #define CH_TOP_FRONT_CENTER       0x00002000
 #define CH_TOP_FRONT_RIGHT        0x00004000
 #define CH_TOP_BACK_LEFT          0x00008000
 #define CH_TOP_BACK_CENTER        0x00010000
 #define CH_TOP_BACK_RIGHT         0x00020000
 #define CH_STEREO_LEFT            0x20000000  ///< Stereo downmix.
 #define CH_STEREO_RIGHT           0x40000000  ///< See CH_STEREO_LEFT.

 
 /* Audio channel convenience macros */

 #define CH_LAYOUT_MONO              (CH_FRONT_CENTER)
 #define CH_LAYOUT_STEREO            (CH_FRONT_LEFT|CH_FRONT_RIGHT)
 #define CH_LAYOUT_SURROUND          (CH_LAYOUT_STEREO|CH_FRONT_CENTER)
 #define CH_LAYOUT_QUAD              (CH_LAYOUT_STEREO|CH_BACK_LEFT|CH_BACK_RIGHT)
 #define CH_LAYOUT_5POINT0           (CH_LAYOUT_SURROUND|CH_SIDE_LEFT|CH_SIDE_RIGHT)
 #define CH_LAYOUT_5POINT1           (CH_LAYOUT_5POINT0|CH_LOW_FREQUENCY)
 #define CH_LAYOUT_7POINT1           (CH_LAYOUT_5POINT1|CH_BACK_LEFT|CH_BACK_RIGHT)
 #define CH_LAYOUT_7POINT1_WIDE      (CH_LAYOUT_SURROUND|CH_LOW_FREQUENCY|\
                                           CH_BACK_LEFT|CH_BACK_RIGHT|\
                                           CH_FRONT_LEFT_OF_CENTER|CH_FRONT_RIGHT_OF_CENTER)
 #define CH_LAYOUT_STEREO_DOWNMIX    (CH_STEREO_LEFT|CH_STEREO_RIGHT)

 /* in bytes */

 #define AVCODEC_MAX_AUDIO_FRAME_SIZE 192000 // 1 second of 48khz 32bit audio

 /**

  * 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
 };
 

 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>.
 #define CODEC_FLAG_PART   0x0080  ///< Use data partitioning.

 /**
  * 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_EXTERN_HUFF     0x1000   ///< Use external Huffman table (for MJPEG).
 #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_ALT_SCAN       0x00100000 ///< Use alternate scan.
 #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_H263P_UMV      0x02000000 ///< unlimited motion vector
 #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_H263P_AIV      0x00000008 ///< H.263 alternative inter VLC

 #define CODEC_FLAG_OBMC           0x00000001 ///< OBMC
 #define CODEC_FLAG_LOOP_FILTER    0x00000800 ///< loop filter

 #define CODEC_FLAG_H263P_SLICE_STRUCT 0x10000000
 #define CODEC_FLAG_INTERLACED_ME  0x20000000 ///< interlaced motion estimation

 #define CODEC_FLAG_SVCD_SCAN_OFFSET 0x40000000 ///< Will reserve space for SVCD scan offset user data.

 #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_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_INTRA_VLC     0x00000800 ///< Use MPEG-2 intra VLC table.
 #define CODEC_FLAG2_MEMC_ONLY     0x00001000 ///< Only do ME/MC (I frames -> ref, P frame -> ME+MC).
 #define CODEC_FLAG2_DROP_FRAME_TIMECODE 0x00002000 ///< timecode is in drop frame format.
 #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.
 #define CODEC_FLAG2_NON_LINEAR_QUANT 0x00010000 ///< Use MPEG-2 nonlinear quantizer.

 #define CODEC_FLAG2_BIT_RESERVOIR 0x00020000 ///< Use a bit reservoir when encoding if possible

 #define CODEC_FLAG2_MBTREE        0x00040000 ///< Use macroblock tree ratecontrol (x264 only)

 /* 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.
  * direct rendering method 1
  */
 #define CODEC_CAP_DR1             0x0002

 /* If 'parse_only' field is true, then avcodec_parse_frame() can be used. */

 #define CODEC_CAP_PARSE_ONLY      0x0004

 #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 NULL at the end to get the delayed data.
  * 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

 //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_COMMON_FRAME \

     /**\
      * pointer to the picture planes.\

      * This might be different from the first allocated byte\

      * - encoding: \
      * - decoding: \
      */\

     uint8_t *data[4];\
     int linesize[4];\
     /**\

      * 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[4];\
     /**\
      * 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.\

      */\
     int 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().\

      */\
     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[4];\

 \
     /**\

      * 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 referece frame index\
      * - encoding: Set by user.\
      * - decoding: Set by libavcodec.\

      */\

     int8_t *ref_index[2];\
 \
     /**\
      * reordered opaque 64bit number (generally a PTS) from AVCodecContext.reordered_opaque\
      * output in AVFrame.reordered_opaque\
      * - encoding: unused\
      * - decoding: Read by user.\
      */\
     int64_t reordered_opaque;\
 

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

 
 #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.

 #define FF_I_TYPE  1 ///< Intra
 #define FF_P_TYPE  2 ///< Predicted
 #define FF_B_TYPE  3 ///< Bi-dir predicted
 #define FF_S_TYPE  4 ///< S(GMC)-VOP MPEG4
 #define FF_SI_TYPE 5 ///< Switching Intra
 #define FF_SP_TYPE 6 ///< Switching Predicted

 #define FF_BI_TYPE 7

 #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).

 /**
  * Audio Video Frame.

  * New fields can be added to the end of FF_COMMON_FRAME with minor version
  * bumps.

  * Removal, reordering and changes to existing fields require a major

  * version bump. No fields should be added into AVFrame before or after
  * FF_COMMON_FRAME!

  * sizeof(AVFrame) must not be used outside libav*.

  */

 typedef struct AVFrame {
     FF_COMMON_FRAME
 } AVFrame;

 /**

  * 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_context
      */

     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 recommanded.
      * - 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.
      * - encoding: Set by user.
      * - decoding: Set by libavcodec.

      */

     enum PixelFormat pix_fmt;

     /**

      * Frame rate emulation. If not zero, the lower layer (i.e. format handler)

      * has to read frames at native frame rate.

      * - encoding: Set by user.
      * - decoding: unused

      */
     int rate_emu;

     /**

      * 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.

      * 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[4],

                             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 SampleFormat sample_fmt;  ///< sample format, currently unused

     /* 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

     int real_pict_num;  ///< Returns the real picture number of previous encoded frame.

     /**

      * 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;

     /**

      * hurry up amount

      * - encoding: unused

      * - decoding: Set by user. 1-> Skip B-frames, 2-> Skip IDCT/dequant too, 5-> Skip everything except header

      * @deprecated Deprecated in favor of skip_idct and skip_frame.

      */
     int hurry_up;

     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 CodecType codec_type; /* see CODEC_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 then 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_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. While setting it to inofficial or lower
      * will mean the encoder might use things that are not supported by all
      * spec compliant decoders. Decoders make no difference between normal,
      * inofficial and experimental, that is they always try to decode things
      * when they can unless they are explicitly asked to behave stupid
      * (=strictly conform to the specs)

      */
     int strict_std_compliance;

 #define FF_COMPLIANCE_VERY_STRICT   2 ///< Strictly conform to a 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_INOFFICIAL   -1 ///< Allow inofficial 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;

     /**

      * Error recognization; higher values will detect more errors but may

      * misdetect some more or less valid parts as errors.

      * - encoding: unused

      * - decoding: Set by user.

      */

     int error_recognition;

 #define FF_ER_CAREFUL         1

 #define FF_ER_COMPLIANT       2
 #define FF_ER_AGGRESSIVE      3
 #define FF_ER_VERY_AGGRESSIVE 4

     /**

      * Called at the beginning of each frame to get a buffer for it.
      * If pic.reference is set then the frame will be read later by libavcodec.

      * avcodec_align_dimensions() should be used to find the required width and

      * height, as they normally need to be rounded up to the next multiple of 16.

      * - 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.

      * - 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;

     int parse_only; /* - decoding only: If true, only parsing is done

                        (function avcodec_parse_frame()). The frame
                        data is returned. Only MPEG codecs support this now. */

     /**

      * 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

     /**

      * 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;

 #define FF_MM_FORCE    0x80000000 /* Force usage of selected flags (OR) */

     /* lower 16 bits - CPU features */

 #define FF_MM_MMX      0x0001 ///< standard MMX
 #define FF_MM_3DNOW    0x0004 ///< AMD 3DNOW
 #define FF_MM_MMXEXT   0x0002 ///< SSE integer functions or AMD MMX ext
 #define FF_MM_SSE      0x0008 ///< SSE functions
 #define FF_MM_SSE2     0x0010 ///< PIV SSE2 functions
 #define FF_MM_3DNOWEXT 0x0020 ///< AMD 3DNowExt
 #define FF_MM_SSE3     0x0040 ///< Prescott SSE3 functions
 #define FF_MM_SSSE3    0x0080 ///< Conroe SSSE3 functions
 #define FF_MM_IWMMXT   0x0100 ///< XScale IWMMXT

 #define FF_MM_ALTIVEC  0x0001 ///< standard AltiVec

 
     /**

      * 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

     /**

      * 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[4];

     /**

      * minimum MB quantizer

      * - encoding: unused

      * - decoding: unused

      */
     int mb_qmin;
 
     /**

      * maximum MB quantizer

      * - encoding: unused

      * - decoding: unused

      */
     int mb_qmax;

     /**

      * 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;

     /**

      * internal_buffer count
      * Don't touch, used by libavcodec default_get_buffer().

      */
     int internal_buffer_count;

     /**

      * internal_buffers
      * Don't touch, used by libavcodec default_get_buffer().

      */
     void *internal_buffer;

 
 #define FF_LAMBDA_SHIFT 7
 #define FF_LAMBDA_SCALE (1<<FF_LAMBDA_SHIFT)
 #define FF_QP2LAMBDA 118 ///< factor to convert from H.263 QP to lambda
 #define FF_LAMBDA_MAX (256*128-1)
 
 #define FF_QUALITY_SCALE FF_LAMBDA_SCALE //FIXME maybe remove

     /**

      * 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;

 
     /**

      * palette control structure

      * - encoding: ??? (no palette-enabled encoder yet)

      * - decoding: Set by user.

      */
     struct AVPaletteControl *palctrl;

 
     /**
      * 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().

      * - 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;

     /**
      * MP3 antialias algorithm, see FF_AA_* below.
      * - encoding: unused

      * - decoding: Set by user.

      */
     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

     /**

      * 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_AAC_MAIN 0

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

 
     /**
      * 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
      * or other things are used.

      * - 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;

 
     /**
      * constant rate factor - quality-based VBR - values ~correspond to qps

      * - encoding: Set by user.

      * - decoding: unused
      */

     float crf;

 
     /**
      * constant quantization parameter rate control method

      * - encoding: Set by user.

      * - decoding: unused
      */
     int cqp;
 
     /**

      * 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;
 
     /**

      * Influences how often B-frames are used.
      * - encoding: Set by user.

      * - decoding: unused
      */
     int bframebias;
 
     /**
      * trellis RD quantization

      * - encoding: Set by user.

      * - decoding: unused
      */
     int trellis;
 
     /**

      * Reduce fluctuations in qp (before curve compression).
      * - encoding: Set by user.

      * - decoding: unused
      */
     float complexityblur;
 
     /**
      * in-loop deblocking filter alphac0 parameter
      * alpha is in the range -6...6

      * - encoding: Set by user.

      * - decoding: unused
      */
     int deblockalpha;
 
     /**
      * in-loop deblocking filter beta parameter
      * beta is in the range -6...6

      * - encoding: Set by user.

      * - decoding: unused
      */
     int deblockbeta;
 
     /**
      * macroblock subpartition sizes to consider - p8x8, p4x4, b8x8, i8x8, i4x4

      * - encoding: Set by user.

      * - decoding: unused
      */
     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
      */
     int directpred;

     /**

      * 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;

 
     /**

      * Adjusts 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
 
     /**

      * Sets whether to use LPC mode - used by FLAC encoder.
      * - encoding: Set by user.
      * - decoding: unused

      */
     int use_lpc;
 
     /**
      * LPC coefficient precision - used by FLAC encoder

      * - encoding: Set by user.
      * - decoding: unused

      */
     int lpc_coeff_precision;
 
     /**

      * - encoding: Set by user.
      * - decoding: unused

      */
     int min_prediction_order;
 
     /**

      * - encoding: Set by user.
      * - decoding: unused

      */
     int max_prediction_order;
 
     /**
      * search method for selecting prediction order

      * - encoding: Set by user.
      * - decoding: unused

      */
     int prediction_order_method;
 
     /**

      * - encoding: Set by user.
      * - decoding: unused

      */
     int min_partition_order;
 
     /**

      * - encoding: Set by user.
      * - decoding: unused

      */
     int max_partition_order;

 
     /**
      * GOP timecode frame start number, in non drop frame format

      * - encoding: Set by user.
      * - decoding: unused

      */
     int64_t timecode_frame_start;

 #if LIBAVCODEC_VERSION_MAJOR < 53

     /**
      * 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

 
     /**
      * 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.
      */
     float drc_scale;

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

 
     /**
      * Bits per sample/pixel of internal libavcodec pixel/sample format.
      * This field is applicable only when sample_fmt is SAMPLE_FMT_S32.
      * - encoding: set by user.
      * - decoding: set by libavcodec.
      */
     int bits_per_raw_sample;

 
     /**
      * Audio channel layout.
      * - encoding: set by user.
      * - decoding: set by libavcodec.
      */
     int64_t channel_layout;
 
     /**
      * Request decoder to use this channel layout if it can (0 for default)
      * - encoding: unused
      * - decoding: Set by user.
      */
     int64_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;

 
     /**
      * 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
      */
     int weighted_p_pred;

 } AVCodecContext;
 

 /**
  * 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 CodecType 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,

                   const uint8_t *buf, int buf_size);

     /**
      * 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 \p name.
      * You \e 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 SampleFormat *sample_fmts;   ///< array of supported sample formats, or NULL if unknown, array is terminated by -1

     const int64_t *channel_layouts;         ///< array of support channel layouts, or NULL if unknown. array is terminated by 0

 } 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 CODEC_TYPE_xxx
      */
     enum CodecType 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 \p buf can be NULL along with \p 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);
 } AVHWAccel;
 
 /**

  * four components are given, that's all.
  * the last component is alpha
  */

 typedef struct AVPicture {

     uint8_t *data[4];

     int linesize[4];       ///< number of bytes per line

 } AVPicture;
 

 /**
  * 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.

  */

 #define AVPALETTE_SIZE 1024

 #define AVPALETTE_COUNT 256

 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;

 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;

 } AVSubtitle;
 
 

 /* resample.c */
 
 struct ReSampleContext;

 struct AVResampleContext;

 
 typedef struct ReSampleContext ReSampleContext;
 

 #if LIBAVCODEC_VERSION_MAJOR < 53
 /**
  * @deprecated Use av_audio_resample_init() instead.
  */
 attribute_deprecated ReSampleContext *audio_resample_init(int output_channels, int input_channels,
                                                           int output_rate, int input_rate);
 #endif
 /**
  *  Initializes 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 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
  * @return allocated ReSampleContext, NULL if error occured
  */
 ReSampleContext *av_audio_resample_init(int output_channels, int input_channels,
                                         int output_rate, int input_rate,
                                         enum SampleFormat sample_fmt_out,
                                         enum SampleFormat 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);
 void audio_resample_close(ReSampleContext *s);
 

 
 /**
  * Initializes 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);

 
 /**
  * resamples.
  * @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);

 
 
 /**
  * Compensates 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.
  *

  * @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, int pix_fmt, int width, int height);
 

 /**
  * Free a picture previously allocated by avpicture_alloc().
  *

  * @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.
  *

  * @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,

                    int pix_fmt, int width, int height);

 int avpicture_layout(const AVPicture* src, int 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.
  *

  * @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
  */

 int avpicture_get_size(int pix_fmt, int width, int height);

 void avcodec_get_chroma_sub_sample(int pix_fmt, int *h_shift, int *v_shift);
 const char *avcodec_get_pix_fmt_name(int pix_fmt);

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

 enum PixelFormat avcodec_get_pix_fmt(const char* name);

 unsigned int avcodec_pix_fmt_to_codec_tag(enum PixelFormat p);

 #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) */

 /**

  * Computes 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(int dst_pix_fmt, int src_pix_fmt,
                              int has_alpha);

 
 /**

  * Finds 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

  * \p 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.

  */

 int avcodec_find_best_pix_fmt(int64_t pix_fmt_mask, int src_pix_fmt,

                               int has_alpha, int *loss_ptr);
 

 
 /**
  * Print in buf the string corresponding to the pixel format with
  * number pix_fmt, or an header if pix_fmt is negative.
  *

  * @param[in] buf the buffer where to write the string
  * @param[in] buf_size the size of buf
  * @param[in] pix_fmt the number of the pixel format to print the corresponding info string, or

  * a negative value to print the corresponding header.
  * Meaningful values for obtaining a pixel format info vary from 0 to PIX_FMT_NB -1.
  */
 void avcodec_pix_fmt_string (char *buf, int buf_size, int pix_fmt);
 

 #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
  */

 int img_get_alpha_info(const AVPicture *src,

                        int pix_fmt, int width, int height);

 /* deinterlace a picture */

 /* deinterlace - if not supported return -1 */

 int avpicture_deinterlace(AVPicture *dst, const AVPicture *src,

                           int 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);

 /**
  * Returns the LIBAVCODEC_VERSION_INT constant.
  */

 unsigned avcodec_version(void);

 /**
  * Initializes libavcodec.
  *
  * @warning This function \e must be called before any other libavcodec
  * function.
  */

 void avcodec_init(void);
 

 #if LIBAVCODEC_VERSION_MAJOR < 53

 /**

  * @deprecated Deprecated in favor of avcodec_register().
  */
 attribute_deprecated void register_avcodec(AVCodec *codec);

 #endif

 
 /**

  * Register the codec \p codec and initialize libavcodec.
  *
  * @see avcodec_init()
  */

 void avcodec_register(AVCodec *codec);

 
 /**

  * Finds 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);

 
 /**

  * Finds 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);

 
 /**

  * Finds 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);

 
 /**

  * Finds 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);
 

 /**
  * Sets the fields of the given AVCodecContext to default values.
  *
  * @param s The AVCodecContext of which the fields should be set to default values.
  */

 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! */
 void avcodec_get_context_defaults2(AVCodecContext *s, enum CodecType);
 

 /**
  * Allocates an AVCodecContext and sets 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
  */

 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! */
 AVCodecContext *avcodec_alloc_context2(enum CodecType);
 

 /**
  * Sets 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);

 
 /**
  * Allocates an AVFrame and sets 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);
 void avcodec_align_dimensions(AVCodecContext *s, int *width, int *height);

 
 /**
  * Checks if the given dimension of a picture is valid, meaning that all
  * bytes of the picture can be addressed with a signed int.
  *
  * @param[in] w Width of the picture.
  * @param[in] h Height of the picture.
  * @return Zero if valid, a negative value if invalid.
  */

 int avcodec_check_dimensions(void *av_log_ctx, unsigned int w, unsigned int h);

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

 int avcodec_thread_init(AVCodecContext *s, int thread_count);
 void avcodec_thread_free(AVCodecContext *s);

 int avcodec_thread_execute(AVCodecContext *s, int (*func)(AVCodecContext *c2, void *arg2),void *arg, int *ret, int count, int size);
 int avcodec_default_execute(AVCodecContext *c, int (*func)(AVCodecContext *c2, void *arg2),void *arg, int *ret, int count, int size);

 //FIXME func typedef
 

 /**

  * Initializes 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_context();
  *
  * 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_context, avcodec_find_decoder, avcodec_find_encoder

  */

 int avcodec_open(AVCodecContext *avctx, AVCodec *codec);

 /**
  * Decodes an audio frame from \p buf into \p samples.

  * The avcodec_decode_audio2() function decodes an audio frame from the input

  * buffer \p buf of size \p buf_size. To decode it, it makes use of the