path: root/Game/Code/lib/ffmpeg/avcodec.pas

                                                                              (*
 * copyright (c) 2001 Fabrice Bellard
 *
 * This library 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 of the License, or (at your option) any later version.
 *
 * This library 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 this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
                                                                              *)
unit avcodec;

interface

uses
  windows, avutil, rational, opt;

const
  av__format = 'avformat-50.dll';

  LIBAVUTIL_VERSION_INT   =  ((51 shl 16) + (16 shl 8) + 0);
  LIBAVUTIL_VERSION       = '51.16.0';
  LIBAVUTIL_BUILD         = LIBAVUTIL_VERSION_INT;

  AV_NOPTS_VALUE: int64   = $8000000000000000;
  AV_TIME_BASE            = 1000000;

type
  TCodecID = (
    CODEC_ID_NONE, CODEC_ID_MPEG1VIDEO,
    CODEC_ID_MPEG2VIDEO, //* prefered ID for MPEG Video 1 or 2 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,

    //* various pcm "codecs" */
    CODEC_ID_PCM_S16LE= $10000,  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,
    //* various adpcm codecs */
    CODEC_ID_ADPCM_IMA_QT= $11000, 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,
    //* AMR */
    CODEC_ID_AMR_NB= $12000, CODEC_ID_AMR_WB,
    //* RealAudio codecs*/
    CODEC_ID_RA_144= $13000, CODEC_ID_RA_288,
    //* various DPCM codecs */
    CODEC_ID_ROQ_DPCM= $14000, CODEC_ID_INTERPLAY_DPCM, CODEC_ID_XAN_DPCM,
    CODEC_ID_SOL_DPCM, CODEC_ID_MP2= $15000,
    CODEC_ID_MP3, //* prefered ID for MPEG Audio layer 1, 2 or3 decoding */
    CODEC_ID_AAC, CODEC_ID_MPEG4AAC, 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, CODEC_ID_QDM2,
    CODEC_ID_COOK, CODEC_ID_TRUESPEECH, CODEC_ID_TTA, CODEC_ID_SMACKAUDIO,
    CODEC_ID_QCELP, CODEC_ID_WAVPACK,
    //* subtitle codecs */
    CODEC_ID_DVD_SUBTITLE= $17000, CODEC_ID_DVB_SUBTITLE,

    CODEC_ID_MPEG2TS= $20000 //* _FAKE_ codec to indicate a raw MPEG2 transport
                              //  stream (only used by libavformat) */
  );

//* CODEC_ID_MP3LAME is absolete */
const
  CODEC_ID_MP3LAME = CODEC_ID_MP3;

  AVPALETTE_SIZE = 1024;
  AVPALETTE_COUNT = 256;

type
  TCodecType = (
    CODEC_TYPE_UNKNOWN = -1,
    CODEC_TYPE_VIDEO,
    CODEC_TYPE_AUDIO,
    CODEC_TYPE_DATA,
    CODEC_TYPE_SUBTITLE
  );

//* currently unused, may be used if 24/32 bits samples ever supported */
//* all in native endian */
  TSampleFormat = (
    SAMPLE_FMT_NONE = -1,
    SAMPLE_FMT_U8,              ///< unsigned 8 bits
    SAMPLE_FMT_S16,             ///< signed 16 bits
    SAMPLE_FMT_S24,             ///< signed 24 bits
    SAMPLE_FMT_S32,             ///< signed 32 bits
    SAMPLE_FMT_FLT             ///< float
  );

const
//* in bytes */
  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
 *)
  FF_INPUT_BUFFER_PADDING_SIZE = 8;

(**
 * minimum encoding buffer size.
 * used to avoid some checks during header writing
 *)
  FF_MIN_BUFFER_SIZE = 16384;

type
//* motion estimation type, EPZS by default */
  TMotion_Est_ID = (
    ME_ZERO = 1,
    ME_FULL,
    ME_LOG,
    ME_PHODS,
    ME_EPZS,
    ME_X1,
    ME_HEX,
    ME_UMH,
    ME_ITER
  );

  TAVDiscard = (
//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
    AVDISCARD_FUCK = $FFFFFF
  );

  PRcOverride = ^TRcOverride;
  TRcOverride = record {16}
    start_frame: integer;
    end_frame: integer;
    qscale: integer; // if this is 0 then quality_factor will be used instead
    quality_factor: single;
  end;

const
  FF_MAX_B_FRAMES = 16;

(* encoding support
   these flags can be passed in AVCodecContext.flags before initing
   Note: not everything is supported yet.
*)

  CODEC_FLAG_QSCALE = $0002;  ///< use fixed qscale
  CODEC_FLAG_4MV    = $0004;  ///< 4 MV per MB allowed / Advanced prediction for H263
  CODEC_FLAG_QPEL   = $0010;  ///< use qpel MC
  CODEC_FLAG_GMC    = $0020;  ///< use GMC
  CODEC_FLAG_MV0    = $0040;  ///< always try a MB with MV=<0,0>
  CODEC_FLAG_PART   = $0080;  ///< use data partitioning
//* parent program gurantees that the input for b-frame containing streams is not written to
//   for at least s->max_b_frames+1 frames, if this is not set than the input will be copied */
  CODEC_FLAG_INPUT_PRESERVED = $0100;
  CODEC_FLAG_PASS1 = $0200;   ///< use internal 2pass ratecontrol in first  pass mode
  CODEC_FLAG_PASS2 = $0400;   ///< use internal 2pass ratecontrol in second pass mode
  CODEC_FLAG_EXTERN_HUFF = $1000; ///< use external huffman table (for mjpeg)
  CODEC_FLAG_GRAY  = $2000;   ///< only decode/encode grayscale
  CODEC_FLAG_EMU_EDGE = $4000; ///< don't draw edges
  CODEC_FLAG_PSNR           = $8000; ///< error[?] variables will be set during encoding
  CODEC_FLAG_TRUNCATED  = $00010000; //** input bitstream might be truncated at a random location instead
                                   //         of only at frame boundaries */
  CODEC_FLAG_NORMALIZE_AQP  = $00020000; ///< normalize adaptive quantization
  CODEC_FLAG_INTERLACED_DCT = $00040000; ///< use interlaced dct
  CODEC_FLAG_LOW_DELAY      = $00080000; ///< force low delay
  CODEC_FLAG_ALT_SCAN       = $00100000; ///< use alternate scan
  CODEC_FLAG_TRELLIS_QUANT  = $00200000; ///< use trellis quantization
  CODEC_FLAG_GLOBAL_HEADER  = $00400000; ///< place global headers in extradata instead of every keyframe
  CODEC_FLAG_BITEXACT       = $00800000; ///< use only bitexact stuff (except (i)dct)
//* Fx : Flag for h263+ extra options */
  CODEC_FLAG_H263P_AIC      = $01000000; ///< H263 Advanced intra coding / MPEG4 AC prediction (remove this)
  CODEC_FLAG_AC_PRED        = $01000000; ///< H263 Advanced intra coding / MPEG4 AC prediction
  CODEC_FLAG_H263P_UMV      = $02000000; ///< Unlimited motion vector
  CODEC_FLAG_CBP_RD         = $04000000; ///< use rate distortion optimization for cbp
  CODEC_FLAG_QP_RD          = $08000000; ///< use rate distortion optimization for qp selectioon
  CODEC_FLAG_H263P_AIV      = $00000008; ///< H263 Alternative inter vlc
  CODEC_FLAG_OBMC           = $00000001; ///< OBMC
  CODEC_FLAG_LOOP_FILTER    = $00000800; ///< loop filter
  CODEC_FLAG_H263P_SLICE_STRUCT = $10000000;
  CODEC_FLAG_INTERLACED_ME  = $20000000; ///< interlaced motion estimation
  CODEC_FLAG_SVCD_SCAN_OFFSET = $40000000; ///< will reserve space for SVCD scan offset user data
  CODEC_FLAG_CLOSED_GOP     = $80000000;
  CODEC_FLAG2_FAST          = $00000001; ///< allow non spec compliant speedup tricks
  CODEC_FLAG2_STRICT_GOP    = $00000002; ///< strictly enforce GOP size
  CODEC_FLAG2_NO_OUTPUT     = $00000004; ///< skip bitstream encoding
  CODEC_FLAG2_LOCAL_HEADER  = $00000008; ///< place global headers at every keyframe instead of in extradata
  CODEC_FLAG2_BPYRAMID      = $00000010; ///< H.264 allow b-frames to be used as references
  CODEC_FLAG2_WPRED         = $00000020; ///< H.264 weighted biprediction for b-frames
  CODEC_FLAG2_MIXED_REFS    = $00000040; ///< H.264 multiple references per partition
  CODEC_FLAG2_8X8DCT        = $00000080; ///< H.264 high profile 8x8 transform
  CODEC_FLAG2_FASTPSKIP     = $00000100; ///< H.264 fast pskip
  CODEC_FLAG2_AUD           = $00000200; ///< H.264 access unit delimiters
  CODEC_FLAG2_BRDO          = $00000400; ///< b-frame rate-distortion optimization
  CODEC_FLAG2_INTRA_VLC     = $00000800; ///< use MPEG-2 intra VLC table
  CODEC_FLAG2_MEMC_ONLY     = $00001000; ///< only do ME/MC (I frames -> ref, P frame -> ME+MC)

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

const
  CODEC_CAP_DRAW_HORIZ_BAND = $001; ///< decoder can use draw_horiz_band callback
(**
 * Codec uses get_buffer() for allocating buffers.
 * direct rendering method 1 *)
  CODEC_CAP_DR1             = $002;
(* if 'parse_only' field is true, then avcodec_parse_frame() can be   used *)
  CODEC_CAP_PARSE_ONLY      = $004;
  CODEC_CAP_TRUNCATED       = $008;
//* codec can export data for HW decoding (XvMC) */
  CODEC_CAP_HWACCEL         = $010;

(**
 * codec has a non zero delay and needs to be feeded with NULL at the end to get the delayed data.
 * if this is not set, the codec is guranteed to never be feeded with NULL data *)
  CODEC_CAP_DELAY           = $0020;
(**
 * Codec can be fed a final frame with a smaller size.
 * This can be used to prevent truncation of the last audio samples. *)
  CODEC_CAP_SMALL_LAST_FRAME = $0040;

//the following defines may change, don't expect compatibility if you use them
   MB_TYPE_INTRA4x4   = $001;
   MB_TYPE_INTRA16x16 = $002; //FIXME h264 specific
   MB_TYPE_INTRA_PCM  = $004; //FIXME h264 specific
   MB_TYPE_16x16      = $008;
   MB_TYPE_16x8       = $010;
   MB_TYPE_8x16       = $020;
   MB_TYPE_8x8        = $040;
   MB_TYPE_INTERLACED = $080;
   MB_TYPE_DIRECT2     = $100; //FIXME
   MB_TYPE_ACPRED     = $200;
   MB_TYPE_GMC        = $400;
   MB_TYPE_SKIP       = $800;
   MB_TYPE_P0L0       = $1000;
   MB_TYPE_P1L0       = $2000;
   MB_TYPE_P0L1       = $4000;
   MB_TYPE_P1L1       = $8000;
   MB_TYPE_L0         = (MB_TYPE_P0L0 or MB_TYPE_P1L0);
   MB_TYPE_L1         = (MB_TYPE_P0L1 or MB_TYPE_P1L1);
   MB_TYPE_L0L1       = (MB_TYPE_L0   or MB_TYPE_L1);
   MB_TYPE_QUANT      = $0010000;
   MB_TYPE_CBP        = $0020000;
//Note bits 24-31 are reserved for codec specific use (h264 ref0, mpeg1 0mv, ...)

type
(**
 * Pan Scan area.
 * this specifies the area which should be displayed. Note there may be multiple such areas for one frame *)
  PAVPanScan = ^TAVPanScan;
  TAVPanScan = record {24}
    (*** id.
     * - encoding: set by user.
     * - decoding: set by lavc     *)
    id: integer;

    (*** width and height in 1/16 pel
     * - encoding: set by user.
     * - decoding: set by lavc     *)
    width: integer;
    height: integer;

    (*** position of the top left corner in 1/16 pel for up to 3 fields/frames.
     * - encoding: set by user.
     * - decoding: set by lavc     *)
    position: array [0..2] of array [0..1] of smallint;
  end;

const
  FF_QSCALE_TYPE_MPEG1	= 0;
  FF_QSCALE_TYPE_MPEG2	= 1;

  FF_BUFFER_TYPE_INTERNAL = 1;
  FF_BUFFER_TYPE_USER     = 2; ///< Direct rendering buffers (image is (de)allocated by user)
  FF_BUFFER_TYPE_SHARED   = 4; ///< buffer from somewhere else, don't dealloc image (data/base), all other tables are not shared
  FF_BUFFER_TYPE_COPY     = 8; ///< just a (modified) copy of some other buffer, don't dealloc anything


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

  FF_BUFFER_HINTS_VALID    = $01; // Buffer hints value is meaningful (if 0 ignore)
  FF_BUFFER_HINTS_READABLE = $02; // Codec will read from buffer
  FF_BUFFER_HINTS_PRESERVE = $04; // User must not alter buffer content
  FF_BUFFER_HINTS_REUSABLE = $08; // Codec will reuse the buffer (update)

type
  (*** Audio Video Frame. *)
  PAVFrame = ^TAVFrame;
  TAVFrame = record {200}
    (*** pointer to the picture planes.
     * this might be different from the first allocated byte *)
    data: array [0..3] of pointer;
    linesize: array [0..3] of integer;
    (*** pointer to the first allocated byte of the picture. can be used in get_buffer/release_buffer
     * this isn't used by lavc unless the default get/release_buffer() is used*)
    base: array [0..3] of pchar;
    (*** 1 -> keyframe, 0-> not *)
    key_frame: integer;
    (*** picture type of the frame, see ?_TYPE below.*)
    pict_type: integer;
    (*** 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*)
    pts: int64;
    (*** picture number in bitstream order.*)
    coded_picture_number: integer;
    (*** picture number in display order.*)
    display_picture_number: integer;
    (*** quality (between 1 (good) and FF_LAMBDA_MAX (bad)) *)
    quality: integer;
    (*** buffer age (1->was last buffer and dint change, 2->..., ...).*)
    age: integer;
    (*** is this picture used as reference*)
    reference: integer;
    (*** QP table*)
    qscale_table: pchar;
    (*** QP store stride*)
    qstride: integer;
    (*** mbskip_table[mb]>=1 if MB didnt change*)
    mbskip_table: pchar;
    (**
     * 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 lavc     *)
    motion_val: array [0..1] of pointer;
    (*** Macroblock type table
     * mb_type_base + mb_width + 2 *)
    mb_type: PCardinal;
    (*** log2 of the size of the block which a single vector in motion_val represents:
     * (4->16x16, 3->8x8, 2-> 4x4, 1-> 2x2)*)
    motion_subsample_log2: byte;
    (*** for some private data of the user*)
    opaque: pointer;
    (*** error*)
    error: array [0..3] of int64;
    (*** type of the buffer (to keep track of who has to dealloc data[*])
     * Note: user allocated (direct rendering) & internal buffers can not coexist currently*)
    _type: integer;
    (*** when decoding, this signal how much the picture must be delayed.
     * extra_delay = repeat_pict / (2*fps)*)
    repeat_pict: integer;
    qscale_type: Integer;
    (*** The content of the picture is interlaced.*)
    interlaced_frame: Integer;
    (*** if the content is interlaced, is top field displayed first.*)
    top_field_first: integer;
    (*** Pan scan.*)
    pan_scan: PAVPanScan;
    (*** tell user application that palette has changed from previous frame.*)
    palette_has_changed: integer;
    (*** Codec suggestion on buffer type if != 0
     * - decoding: set by lavc (before get_buffer() call))*)
    buffer_hints: integer;
    (*** DCT coeffitients*)
    dct_coeff: PSmallInt;
    (*** Motion referece frame index*)
    ref_index: array [0..1] of pchar;
  end;

const
  DEFAULT_FRAME_RATE_BASE = 1001000;

  FF_BUG_AUTODETECT       = 1;  ///< autodetection
  FF_BUG_OLD_MSMPEG4      = 2;
  FF_BUG_XVID_ILACE       = 4;
  FF_BUG_UMP4             = 8;
  FF_BUG_NO_PADDING       = 16;
  FF_BUG_AMV              = 32;
  FF_BUG_AC_VLC           = 0;  ///< will be removed, libavcodec can now handle these non compliant files by default
  FF_BUG_QPEL_CHROMA      = 64;
  FF_BUG_STD_QPEL         = 128;
  FF_BUG_QPEL_CHROMA2     = 256;
  FF_BUG_DIRECT_BLOCKSIZE = 512;
  FF_BUG_EDGE             = 1024;
  FF_BUG_HPEL_CHROMA      = 2048;
  FF_BUG_DC_CLIP          = 4096;
  FF_BUG_MS               = 8192; ///< workaround various bugs in microsofts broken decoders

  FF_COMPLIANCE_VERY_STRICT   = 2; ///< strictly conform to a older more strict version of the spec or reference software
  FF_COMPLIANCE_STRICT        = 1; ///< strictly conform to all the things in the spec no matter what consequences
  FF_COMPLIANCE_NORMAL        = 0;
  FF_COMPLIANCE_INOFFICIAL    = -1; ///< allow inofficial extensions
  FF_COMPLIANCE_EXPERIMENTAL  = -2; ///< allow non standarized experimental things

  FF_ER_CAREFUL         = 1;
  FF_ER_COMPLIANT       = 2;
  FF_ER_AGGRESSIVE      = 3;
  FF_ER_VERY_AGGRESSIVE = 4;

  FF_DCT_AUTO    = 0;
  FF_DCT_FASTINT = 1;
  FF_DCT_INT     = 2;
  FF_DCT_MMX     = 3;
  FF_DCT_MLIB    = 4;
  FF_DCT_ALTIVEC = 5;
  FF_DCT_FAAN    = 6;

  FF_IDCT_AUTO         = 0;
  FF_IDCT_INT          = 1;
  FF_IDCT_SIMPLE       = 2;
  FF_IDCT_SIMPLEMMX    = 3;
  FF_IDCT_LIBMPEG2MMX  = 4;
  FF_IDCT_PS2          = 5;
  FF_IDCT_MLIB         = 6;
  FF_IDCT_ARM          = 7;
  FF_IDCT_ALTIVEC      = 8;
  FF_IDCT_SH4          = 9;
  FF_IDCT_SIMPLEARM    = 10;
  FF_IDCT_H264         = 11;
  FF_IDCT_VP3          = 12;
  FF_IDCT_IPP          = 13;
  FF_IDCT_XVIDMMX      = 14;

  FF_EC_GUESS_MVS   = 1;
  FF_EC_DEBLOCK     = 2;

  FF_MM_FORCE	      = $80000000; (* force usage of selected flags (OR) *)
    (* lower 16 bits - CPU features *)

  FF_MM_MMX	        = $0001; (* standard MMX *)
  FF_MM_3DNOW	      = $0004; (* AMD 3DNOW *)
  FF_MM_MMXEXT	    = $0002; (* SSE integer functions or AMD MMX ext *)
  FF_MM_SSE	        = $0008; (* SSE functions *)
  FF_MM_SSE2	      = $0010; (* PIV SSE2 functions *)
  FF_MM_3DNOWEXT	  = $0020; (* AMD 3DNowExt *)
  FF_MM_IWMMXT	    = $0100; (* XScale IWMMXT *)

  FF_PRED_LEFT   = 0;
  FF_PRED_PLANE  = 1;
  FF_PRED_MEDIAN = 2;

  FF_DEBUG_PICT_INFO    = 1;
  FF_DEBUG_RC           = 2;
  FF_DEBUG_BITSTREAM    = 4;
  FF_DEBUG_MB_TYPE      = 8;
  FF_DEBUG_QP           = 16;
  FF_DEBUG_MV           = 32;
  FF_DEBUG_DCT_COEFF    = $00000040;
  FF_DEBUG_SKIP         = $00000080;
  FF_DEBUG_STARTCODE    = $00000100;
  FF_DEBUG_PTS          = $00000200;
  FF_DEBUG_ER           = $00000400;
  FF_DEBUG_MMCO         = $00000800;
  FF_DEBUG_BUGS         = $00001000;
  FF_DEBUG_VIS_QP       = $00002000;
  FF_DEBUG_VIS_MB_TYPE  = $00004000;

  FF_DEBUG_VIS_MV_P_FOR  = $00000001; //visualize forward predicted MVs of P frames
  FF_DEBUG_VIS_MV_B_FOR  = $00000002; //visualize forward predicted MVs of B frames
  FF_DEBUG_VIS_MV_B_BACK = $00000004; //visualize backward predicted MVs of B frames

  FF_CMP_SAD  = 0;
  FF_CMP_SSE  = 1;
  FF_CMP_SATD = 2;
  FF_CMP_DCT  = 3;
  FF_CMP_PSNR = 4;
  FF_CMP_BIT  = 5;
  FF_CMP_RD   = 6;
  FF_CMP_ZERO = 7;
  FF_CMP_VSAD = 8;
  FF_CMP_VSSE = 9;
  FF_CMP_NSSE = 10;
  FF_CMP_W53  = 11;
  FF_CMP_W97  = 12;
  FF_CMP_DCTMAX = 13;
  FF_CMP_CHROMA = 256;

  FF_DTG_AFD_SAME         = 8;
  FF_DTG_AFD_4_3          = 9;
  FF_DTG_AFD_16_9         = 10;
  FF_DTG_AFD_14_9         = 11;
  FF_DTG_AFD_4_3_SP_14_9  = 13;
  FF_DTG_AFD_16_9_SP_14_9 = 14;
  FF_DTG_AFD_SP_4_3       = 15;

  FF_DEFAULT_QUANT_BIAS   = 999999;

  FF_LAMBDA_SHIFT   = 7;
  FF_LAMBDA_SCALE   = (1 shl FF_LAMBDA_SHIFT);
  FF_QP2LAMBDA      = 118; ///< factor to convert from H.263 QP to lambda
  FF_LAMBDA_MAX     = (256 * 128 - 1);

  FF_QUALITY_SCALE  = FF_LAMBDA_SCALE; //FIXME maybe remove

  FF_CODER_TYPE_VLC   = 0;
  FF_CODER_TYPE_AC    = 1;

  SLICE_FLAG_CODED_ORDER    = $0001; ///< draw_horiz_band() is called in coded order instead of display
  SLICE_FLAG_ALLOW_FIELD    = $0002; ///< allow draw_horiz_band() with field slices (MPEG2 field pics)
  SLICE_FLAG_ALLOW_PLANE    = $0004; ///< allow draw_horiz_band() with 1 component at a time (SVQ1)

  FF_MB_DECISION_SIMPLE = 0;        ///< uses mb_cmp
  FF_MB_DECISION_BITS   = 1;        ///< chooses the one which needs the fewest bits
  FF_MB_DECISION_RD     = 2;        ///< rate distoration

  FF_AA_AUTO    = 0;
  FF_AA_FASTINT = 1; //not implemented yet
  FF_AA_INT     = 2;
  FF_AA_FLOAT   = 3;

  FF_PROFILE_UNKNOWN  = -99;

  FF_LEVEL_UNKNOWN    = -99;

  X264_PART_I4X4 = $001;  (* Analyse i4x4 *)
  X264_PART_I8X8 = $002;  (* Analyse i8x8 (requires 8x8 transform) *)
  X264_PART_P8X8 = $010;  (* Analyse p16x8, p8x16 and p8x8 *)
  X264_PART_P4X4 = $020;  (* Analyse p8x4, p4x8, p4x4 *)
  X264_PART_B8X8 = $100;  (* Analyse b16x8, b8x16 and b8x8 *)

type
  PAVCLASS = ^TAVCLASS;
  PAVCodecContext = ^TAVCodecContext;
  PAVCodec = ^TAVCodec;
  PAVPaletteControl = ^TAVPaletteControl;

  TAVCLASS = record {12}
    class_name: pchar;
    (* actually passing a pointer to an AVCodecContext
					or AVFormatContext, which begin with an AVClass.
					Needed because av_log is in libavcodec and has no visibility
					of AVIn/OutputFormat *)
    item_name: function (): pchar; cdecl;
    option: PAVOption;
  end;

  TAVCodecContext = record {720}
    (*** Info on struct for av_log
     * - set by avcodec_alloc_context     *)
    av_class: PAVClass;
    (*** the average bitrate.
     * - encoding: set by user. unused for constant quantizer encoding
     * - decoding: set by lavc. 0 or some bitrate if this info is available in the stream     *)
    bit_rate: integer;
    (*** 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     *)
    bit_rate_tolerance: integer;
    (*** CODEC_FLAG_*.
     * - encoding: set by user.
     * - decoding: set by user.     *)
    flags: integer;
    (*** some codecs needs additionnal format info. It is stored here
     * - encoding: set by user.
     * - decoding: set by lavc. (FIXME is this ok?)     *)
    sub_id: integer;

    (**
     * 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) [7, 8 are x264 specific, 9 is snow specific]
     * - encoding: MUST be set by user.
     * - decoding: unused     *)
    me_method: integer;

    (**
     * some codecs need / can use extra-data 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
     * then extradata_size to avoid prolems if its read with the bitstream reader
     * the bytewise contents of extradata must not depend on the architecture or cpu endianness
     * - encoding: set/allocated/freed by lavc.
     * - decoding: set/allocated/freed by user.
     *)
    extradata: pointer;
    extradata_size: integer;

    (**
     * 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 lavc.     *)
    time_base: TAVRational;

    (* video only *)
    (*** picture width / height.
     * - encoding: MUST be set by user.
     * - decoding: set by lavc.
     * Note, for compatibility its possible to set this instead of
     * coded_width/height before decoding     *)
    width, height: integer;
    (*** the number of pictures in a group of pitures, or 0 for intra_only.
     * - encoding: set by user.
     * - decoding: unused     *)
    gop_size: integer;
    (*** pixel format, see PIX_FMT_xxx.
     * - encoding: set by user.
     * - decoding: set by lavc.     *)
    pix_fmt: TAVPixelFormat;
    (*** Frame rate emulation. If not zero lower layer (i.e. format handler)
     * has to read frames at native frame rate.
     * - encoding: set by user.
     * - decoding: unused.     *)
    rate_emu: integer;
    (*** if non NULL, 'draw_horiz_band' is called by the libavcodec
     * decoder to draw an horizontal band. It improve cache usage. Not
     * all codecs can do that. You must check the codec capabilities
     * before
     * - 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 *)
    draw_horiz_band: procedure (s: PAVCodecContext;
                                const src: PAVFrame; offset: PInteger;
                                y: integer; _type: integer; height: integer); cdecl;

    (* audio only *)
    sample_rate: integer; ///< samples per sec
    channels: integer;
    (*** audio sample format.
     * - encoding: set by user.
     * - decoding: set by lavc.     *)
    sample_fmt: TSampleFormat;  ///< sample format, currenly unused

    (* the following data should not be initialized *)
    (*** samples per packet. initialized when calling 'init'     *)
    frame_size: integer;
    frame_number: integer;   ///< audio or video frame number
    real_pict_num: integer;  ///< 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 lavc.
     * - decoding: unused     *)
    delay: integer;

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

    (*** minimum quantizer.
     * - encoding: set by user.
     * - decoding: unused     *)
    qmin: integer;

    (*** maximum quantizer.
     * - encoding: set by user.
     * - decoding: unused     *)
    qmax: integer;

    (*** maximum quantizer difference etween frames.
     * - encoding: set by user.
     * - decoding: unused     *)
    max_qdiff: integer;

    (*** 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     *)
    max_b_frames: integer;

    (*** qscale factor between ip and b frames.
     * - encoding: set by user.
     * - decoding: unused     *)
    b_quant_factor: single;

    (** obsolete FIXME remove *)
    rc_strategy: integer;
    b_frame_strategy: integer;

    (*** hurry up amount.
     * deprecated in favor of skip_idct and skip_frame
     * - encoding: unused
     * - decoding: set by user. 1-> skip b frames, 2-> skip idct/dequant too, 5-> skip everything except header     *)
    hurry_up: integer;

    codec: PAVCodec;

    priv_data: pointer;

    (* unused, FIXME remove*)
    rtp_mode: integer;

    rtp_payload_size: integer;  (* The size of the RTP payload: the coder will  *)
                                (* do it's 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 transmited RTP payload    *)


    (* The RTP callback: This function is called   *)
    (* every time the encoder has a packet to send *)
    (* 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                  *)
    rtp_callback: procedure (avctx: PAVCodecContext; data: pointer;
                             size: integer; mb_nb: integer); cdecl;

    (* statistics, used for 2-pass encoding *)
    mv_bits: integer;
    header_bits: integer;
    i_tex_bits: integer;
    p_tex_bits: integer;
    i_count: integer;
    p_count: integer;
    skip_count: integer;
    misc_bits: integer;

    (*** number of bits used for the previously encoded frame.
     * - encoding: set by lavc
     * - decoding: unused     *)
    frame_bits: integer;

    (*** private data of the user, can be used to carry app specific stuff.
     * - encoding: set by user
     * - decoding: set by user     *)
    opaque: pointer;

    codec_name: array [0..31] of char;
    codec_type: TCodecType; (* see CODEC_TYPE_xxx *)
    codec_id: TCodecID; (* see CODEC_ID_xxx *)

    (*** fourcc (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A').
     * this is used to workaround some encoder bugs
     * - encoding: set by user, if not then the default based on codec_id will be used
     * - decoding: set by user, will be converted to upper case by lavc during init     *)
//    codec_tag: cardinal;  // ����� array [0..3] of char - ����� ����� FOURCC
    codec_tag: array [0..3] of char; 

    (*** workaround bugs in encoders which sometimes cannot be detected automatically.
     * - encoding: set by user
     * - decoding: set by user     *)
    workaround_bugs: integer;

    (*** luma single coeff elimination threshold.
     * - encoding: set by user
     * - decoding: unused     *)
    luma_elim_threshold: integer;

    (*** chroma single coeff elimination threshold.
     * - encoding: set by user
     * - decoding: unused     *)
    chroma_elim_threshold: integer;

    (*** strictly follow the std (MPEG4, ...).
     * - encoding: set by user
     * - decoding: unused     *)
    strict_std_compliance: integer;

    (*** qscale offset 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     *)
    b_quant_offset: single;

    (*** error resilience higher values will detect more errors but may missdetect
     * some more or less valid parts as errors.
     * - encoding: unused
     * - decoding: set by user     *)
    error_resilience: integer;

    (*** 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 lavc
     * 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 lavc, user can override     *)
    get_buffer: function (c: PAVCodecContext; pic: PAVFrame): integer; cdecl;

    (*** called to release buffers which where 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 lavc, user can override     *)
    release_buffer: procedure (c: PAVCodecContext; pic: PAVFrame); cdecl;

    (*** if 1 the stream has a 1 frame delay during decoding.
     * - encoding: set by lavc
     * - decoding: set by lavc     *)
    has_b_frames: integer;

    (*** number of bytes per packet if constant and known or 0
     * used by some WAV based audio codecs     *)
    block_align: integer;

    parse_only: integer; (* - 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     *)
    mpeg_quant: integer;

    (*** pass1 encoding statistics output buffer.
     * - encoding: set by lavc
     * - decoding: unused     *)
    stats_out: pchar;

    (*** pass2 encoding statistics input buffer.
     * concatenated stuff from stats_out of pass1 should be placed here
     * - encoding: allocated/set/freed by user
     * - decoding: unused     *)
    stats_in: pchar;

    (*** 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     *)
    rc_qsquish: single;

    rc_qmod_amp: single;
    rc_qmod_freq: integer;

    (*** ratecontrol override, see RcOverride.
     * - encoding: allocated/set/freed by user.
     * - decoding: unused     *)
    rc_override: PRcOverride;
    rc_override_count: integer;

    (*** rate control equation.
     * - encoding: set by user
     * - decoding: unused     *)
    rc_eq: pchar;

    (*** maximum bitrate.
     * - encoding: set by user.
     * - decoding: unused     *)
    rc_max_rate: integer;

    (*** minimum bitrate.
     * - encoding: set by user.
     * - decoding: unused     *)
    rc_min_rate: integer;

    (*** decoder bitstream buffer size.
     * - encoding: set by user.
     * - decoding: unused     *)
    rc_buffer_size: integer;
    rc_buffer_aggressivity: single;

    (*** 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     *)
    i_quant_factor: single;

    (*** qscale offset between p and i frames.
     * - encoding: set by user.
     * - decoding: unused     *)
    i_quant_offset: single;

    (*** initial complexity for pass1 ratecontrol.
     * - encoding: set by user.
     * - decoding: unused     *)
    rc_initial_cplx: single;

    (*** dct algorithm, see FF_DCT_* below.
     * - encoding: set by user
     * - decoding: unused     *)
    dct_algo: integer;

    (*** luminance masking (0-> disabled).
     * - encoding: set by user
     * - decoding: unused     *)
    lumi_masking: single;

    (*** temporary complexity masking (0-> disabled).
     * - encoding: set by user
     * - decoding: unused     *)
    temporal_cplx_masking: single;

    (*** spatial complexity masking (0-> disabled).
     * - encoding: set by user
     * - decoding: unused     *)
    spatial_cplx_masking: single;

    (**     * p block masking (0-> disabled).
     * - encoding: set by user
     * - decoding: unused     *)
    p_masking: single;

    (*** darkness masking (0-> disabled).
     * - encoding: set by user
     * - decoding: unused     *)
    dark_masking: single;

    (* for binary compatibility *)
    unused: integer;

    (*** idct algorithm, see FF_IDCT_* below.
     * - encoding: set by user
     * - decoding: set by user     *)
    idct_algo: integer;

    (*** slice count.
     * - encoding: set by lavc
     * - decoding: set by user (or 0)     *)
    slice_count: integer;

    (*** slice offsets in the frame in bytes.
     * - encoding: set/allocated by lavc
     * - decoding: set/allocated by user (or NULL)     *)
    slice_offset: PInteger;

    (*** error concealment flags.
     * - encoding: unused
     * - decoding: set by user     *)
    error_concealment: integer;

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

    (*** bits per sample/pixel from the demuxer (needed for huffyuv).
     * - encoding: set by lavc
     * - decoding: set by user     *)
     bits_per_sample: integer;

    (*** prediction method (needed for huffyuv).
     * - encoding: set by user
     * - decoding: unused     *)
     prediction_method: integer;

    (*** sample aspect ratio (0 if unknown).
     * numerator and denominator must be relative prime and smaller then 256 for some video standards
     * - encoding: set by user.
     * - decoding: set by lavc.     *)
    sample_aspect_ratio: TAVRational;

    (*** the picture in the bitstream.
     * - encoding: set by lavc
     * - decoding: set by lavc     *)
    coded_frame: PAVFrame;

    (*** debug.
     * - encoding: set by user.
     * - decoding: set by user.     *)
    debug: integer;

    (*** debug.
     * - encoding: set by user.
     * - decoding: set by user.     *)
    debug_mv: integer;

    (** error.
     * - encoding: set by lavc if flags&CODEC_FLAG_PSNR
     * - decoding: unused     *)
    error: array [0..3] of int64;

    (*** minimum MB quantizer.
     * - encoding: unused
     * - decoding: unused     *)
    mb_qmin: integer;

    (*** maximum MB quantizer.
     * - encoding: unused
     * - decoding: unused     *)
    mb_qmax: integer;

    (*** motion estimation compare function.
     * - encoding: set by user.
     * - decoding: unused     *)
    me_cmp: integer;

    (*** subpixel motion estimation compare function.
     * - encoding: set by user.
     * - decoding: unused     *)
    me_sub_cmp: integer;
    (*** macroblock compare function (not supported yet).
     * - encoding: set by user.
     * - decoding: unused     *)
    mb_cmp: integer;
    (*** interlaced dct compare function
     * - encoding: set by user.
     * - decoding: unused     *)
    ildct_cmp: integer;
    (*** ME diamond size & shape.
     * - encoding: set by user.
     * - decoding: unused     *)
    dia_size: integer;

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

    (*** pre pass for motion estimation.
     * - encoding: set by user.
     * - decoding: unused     *)
    pre_me: integer;

    (*** motion estimation pre pass compare function.
     * - encoding: set by user.
     * - decoding: unused     *)
    me_pre_cmp: integer;

    (*** ME pre pass diamond size & shape.
     * - encoding: set by user.
     * - decoding: unused     *)
    pre_dia_size: integer;

    (*** subpel ME quality.
     * - encoding: set by user.
     * - decoding: unused     *)
    me_subpel_quality: integer;

    (*** callback to negotiate the pixelFormat.
     * @param fmt is the list of formats which are supported by the codec,
     * its terminated by -1 as 0 is a valid format, the formats are ordered by quality
     * the first is allways the native one
     * @return the choosen format
     * - encoding: unused
     * - decoding: set by user, if not set then the native format will always be choosen
     *)
    get_format: function (s: PAVCodecContext; const fmt: PAVPixelFormat): TAVPixelFormat; cdecl;

    (*** DTG active format information (additionnal aspect ratio
     * information only used in DVB MPEG2 transport streams). 0 if
     * not set.
     * - encoding: unused.
     * - decoding: set by decoder     *)
    dtg_active_format: integer;

    (*** Maximum motion estimation search range in subpel units.
     * if 0 then no limit
     * - encoding: set by user.
     * - decoding: unused.     *)
    me_range: integer;

    (*** intra quantizer bias.
     * - encoding: set by user.
     * - decoding: unused     *)
    intra_quant_bias: integer;

    (*** inter quantizer bias.
     * - encoding: set by user.
     * - decoding: unused     *)
    inter_quant_bias: integer;

    (*** color table ID.
     * - encoding: unused.
     * - decoding: which clrtable should be used for 8bit RGB images
     *             table have to be stored somewhere FIXME     *)
    color_table_id: integer;

    (*** internal_buffer count.
     * Don't touch, used by lavc default_get_buffer()     *)
    internal_buffer_count: integer;

    (*** internal_buffers.
     * Don't touch, used by lavc default_get_buffer()     *)
    internal_buffer: pointer;

    (*** global quality for codecs which cannot change it per frame.
     * this should be proportional to MPEG1/2/4 qscale.
     * - encoding: set by user.
     * - decoding: unused     *)
    global_quality: integer;

    (*** coder type
     * - encoding: set by user.
     * - decoding: unused     *)
    coder_type: integer;

    (*** context model
     * - encoding: set by user.
     * - decoding: unused     *)
    context_model: integer;

    (*** slice flags
     * - encoding: unused
     * - decoding: set by user.     *)
    slice_flags: integer;

    (*** XVideo Motion Acceleration
     * - encoding: forbidden
     * - decoding: set by decoder     *)
    xvmc_acceleration: integer;

    (*** macroblock decision mode
     * - encoding: set by user.
     * - decoding: unused     *)
    mb_decision: integer;

    (*** custom intra quantization matrix
     * - encoding: set by user, can be NULL
     * - decoding: set by lavc     *)
    intra_matrix: Pword;

    (*** custom inter quantization matrix
     * - encoding: set by user, can be NULL
     * - decoding: set by lavc     *)
    inter_matrix: Pword;

    (*** fourcc from the AVI stream header (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A').
     * this is used to workaround some encoder bugs
     * - encoding: unused
     * - decoding: set by user, will be converted to upper case by lavc during init     *)
    stream_codec_tag: array [0..3] of char; //cardinal;

    (*** scene change detection threshold.
     * 0 is default, larger means fewer detected scene changes
     * - encoding: set by user.
     * - decoding: unused     *)
    scenechange_threshold: integer;

    (*** minimum lagrange multipler
     * - encoding: set by user.
     * - decoding: unused     *)
    lmin: integer;

    (*** maximum lagrange multipler
     * - encoding: set by user.
     * - decoding: unused     *)
    lmax: integer;

    (*** Palette control structure
     * - encoding: ??? (no palette-enabled encoder yet)
     * - decoding: set by user.     *)
    palctrl: PAVPaletteControl;

    (*** noise reduction strength
     * - encoding: set by user.
     * - decoding: unused     *)
    noise_reduction: integer;

    (*** called at the beginning of a frame to get cr buffer for it.
     * buffer type (size, hints) must be the same. lavc won't check it.
     * lavc 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 lavc, user can override     *)
    reget_buffer: function (c: PAVCodecContext; pic: PAVFrame): integer; cdecl;

    (*** number of bits which should be loaded into the rc buffer before decoding starts
     * - encoding: set by user.
     * - decoding: unused     *)
    rc_initial_buffer_occupancy: integer;
    inter_threshold: integer;

    (*** CODEC_FLAG2_*.
     * - encoding: set by user.
     * - decoding: set by user.     *)
    flags2: integer;

    (*** simulates errors in the bitstream to test error concealment.
     * - encoding: set by user.
     * - decoding: unused.     *)
    error_rate: integer;

    (*** MP3 antialias algorithm, see FF_AA_* below.
     * - encoding: unused
     * - decoding: set by user     *)
    antialias_algo: integer;

    (*** Quantizer noise shaping.
     * - encoding: set by user
     * - decoding: unused     *)
    quantizer_noise_shaping: integer;

    (*** Thread count.
     * is used to decide how many independant tasks should be passed to execute()
     * - encoding: set by user
     * - decoding: set by user     *)
    thread_count: integer;

    (*** the codec may call this to execute several independant 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 lavc, user can override
     * - decoding: set by lavc, user can override     *)
    execute: function (c: PAVCodecContext; func: pointer; arg: PPointer; ret: PInteger; count: integer): integer; cdecl;

    (*** Thread opaque.
     * can be used by execute() to store some per AVCodecContext stuff.
     * - encoding: set by execute()
     * - decoding: set by execute()     *)
    thread_opaque: pointer;

    (*** Motion estimation threshold. under which no motion estimation is
     * performed, but instead the user specified motion vectors are used
     * - encoding: set by user
     * - decoding: unused     *)
     me_threshold: integer;

    (*** Macroblock threshold. under which the user specified macroblock types will be used
     * - encoding: set by user
     * - decoding: unused    *)
     mb_threshold: integer;

    (*** precision of the intra dc coefficient - 8.
     * - encoding: set by user
     * - decoding: unused     *)
     intra_dc_precision: integer;

    (*** noise vs. sse weight for the nsse comparsion function.
     * - encoding: set by user
     * - decoding: unused     *)
     nsse_weight: integer;

    (*** number of macroblock rows at the top which are skipped.
     * - encoding: unused
     * - decoding: set by user     *)
     skip_top: integer;

    (*** number of macroblock rows at the bottom which are skipped.
     * - encoding: unused
     * - decoding: set by user     *)
     skip_bottom: integer;

    (*** profile
     * - encoding: set by user
     * - decoding: set by lavc     *)
     profile: integer;

    (*** level
     * - encoding: set by user
     * - decoding: set by lavc     *)
     level: integer;

    (*** low resolution decoding. 1-> 1/2 size, 2->1/4 size
     * - encoding: unused
     * - decoding: set by user     *)
     lowres: integer;

    (*** bitsream 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     *)
    coded_width, coded_height: integer;

    (*** frame skip threshold
     * - encoding: set by user
     * - decoding: unused     *)
    frame_skip_threshold: integer;

    (*** frame skip factor
     * - encoding: set by user
     * - decoding: unused     *)
    frame_skip_factor: integer;

    (*** frame skip exponent
     * - encoding: set by user
     * - decoding: unused     *)
    frame_skip_exp: integer;

    (*** frame skip comparission function
     * - encoding: set by user.
     * - decoding: unused     *)
    frame_skip_cmp: integer;

    (*** border processing masking. raises the quantizer for mbs on the borders
     * of the picture.
     * - encoding: set by user
     * - decoding: unused     *)
    border_masking: single;

    (*** minimum MB lagrange multipler.
     * - encoding: set by user.
     * - decoding: unused     *)
    mb_lmin: integer;

    (*** maximum MB lagrange multipler.
     * - encoding: set by user.
     * - decoding: unused     *)
    mb_lmax: integer;

    (***
     * - encoding: set by user.
     * - decoding: unused     *)
    me_penalty_compensation: integer;

    (***
     * - encoding: unused
     * - decoding: set by user.     *)
    skip_loop_filter: TAVDiscard;

    (**     *
     * - encoding: unused
     * - decoding: set by user.     *)
    skip_idct: TAVDiscard;

    (**     *
     * - encoding: unused
     * - decoding: set by user.     *)
    skip_frame: TAVDiscard;

    (**     *
     * - encoding: set by user.
     * - decoding: unused     *)
    bidir_refine: integer;

    (**     *
     * - encoding: set by user.
     * - decoding: unused     *)
    brd_scale: integer;

    (**
     * constant rate factor - quality-based VBR - values ~correspond to qps
     * - encoding: set by user.
     * - decoding: unused     *)
    crf: integer;

    (**
     * constant quantization parameter rate control method
     * - encoding: set by user.
     * - decoding: unused     *)
    cqp: integer;

    (**
     * minimum gop size
     * - encoding: set by user.
     * - decoding: unused     *)
    keyint_min: integer;

    (**
     * number of reference frames
     * - encoding: set by user.
     * - decoding: unused     *)
    refs: integer;

    (**
     * chroma qp offset from luma
     * - encoding: set by user.
     * - decoding: unused     *)
    chromaoffset: integer;

    (**
     * influences how often b-frames are used
     * - encoding: set by user.
     * - decoding: unused     *)
    bframebias: integer;

    (**
     * trellis RD quantization
     * - encoding: set by user.
     * - decoding: unused     *)
    trellis: integer;

    (**
     * reduce fluctuations in qp (before curve compression)
     * - encoding: set by user.
     * - decoding: unused     *)
    complexityblur: single;

    (**
     * in-loop deblocking filter alphac0 parameter
     * alpha is in the range -6...6
     * - encoding: set by user.
     * - decoding: unused     *)
    deblockalpha: integer;

    (**
     * in-loop deblocking filter beta parameter
     * beta is in the range -6...6
     * - encoding: set by user.
     * - decoding: unused     *)
    deblockbeta: integer;

    (**
     * macroblock subpartition sizes to consider - p8x8, p4x4, b8x8, i8x8, i4x4
     * - encoding: set by user.
     * - decoding: unused     *)
    partitions: integer;

    (**
     * direct mv prediction mode - 0 (none), 1 (spatial), 2 (temporal)
     * - encoding: set by user.
     * - decoding: unused     *)
    directpred: integer;

    (**
     * audio cutoff bandwidth (0 means "automatic") . Currently used only by FAAC
     * - encoding: set by user.
     * - decoding: unused     *)
    cutoff: integer;

    (**
     * multiplied by qscale for each frame and added to scene_change_score
     * - encoding: set by user.
     * - decoding: unused     *)
    scenechange_factor: integer;

    (**     *
     * note: value depends upon the compare functin used for fullpel ME
     * - encoding: set by user.
     * - decoding: unused     *)
    mv0_threshold: integer;

    (**
     * adjusts sensitivity of b_frame_strategy 1
     * - encoding: set by user.
     * - decoding: unused      *)
    b_sensitivity: integer;

    (**
     * - encoding: set by user.
     * - decoding: unused      *)
    compression_level: integer;

    (**
     * sets whether to use LPC mode - used by FLAC encoder
     * - encoding: set by user.
     * - decoding: unused.     *)
    use_lpc: integer;

    (**
     * LPC coefficient precision - used by FLAC encoder
     * - encoding: set by user.
     * - decoding: unused.     *)
    lpc_coeff_precision: integer;

    (**
     * - encoding: set by user.
     * - decoding: unused.           *)
    min_prediction_order: integer;

    (**
     * - encoding: set by user.
     * - decoding: unused.            *)
    max_prediction_order: integer;

    (**
     * search method for selecting prediction order
     * - encoding: set by user.
     * - decoding: unused.            *)
    prediction_order_method: integer;

    (**
     * - encoding: set by user.
     * - decoding: unused.               *)
    min_partition_order: integer;

    (**
     * - encoding: set by user.
     * - decoding: unused.           *)
    max_partition_order: integer;
  end;

(**
 * AVCodec.
 *)
  TAVCodec = record
    name: pchar;
    _type: TCodecType;
    id: TCodecID;
    priv_data_size: integer;
    init: function (avctx: pAVCodecContext): integer; cdecl;
    encode: function (avctx: PAVCodecContext; buf: pchar; buf_size: integer; data: pointer): integer; cdecl;
    close: function (avctx: PAVCodecContext): integer; cdecl;
    decode: function (avctx: PAVCodecContext; outdata: pointer; outdata_size: PInteger;
                  buf: pchar; buf_size: integer): integer; cdecl;
    capabilities: integer;
// todo: check this ->
//    void *dummy; // FIXME remove next time we break binary compatibility
    next: PAVCodec;
    flush: procedure (avctx: PAVCodecContext); cdecl;
    supported_framerates: PAVRational; ///array of supported framerates, or NULL if any, array is terminated by {0,0}
    pix_fmts: PAVPixelFormat;       ///array of supported pixel formats, or NULL if unknown, array is terminanted by -1
  end;

(**
 * four components are given, that's all.
 * the last component is alpha
 *)
  PAVPicture = ^TAVPicture;
  TAVPicture = record
    data: array [0..3] of pchar;
    linesize: array [0..3] of integer;       ///< number of bytes per line
  end;

(**
 * AVPaletteControl
 * This structure defines a method for communicating palette changes
 * between and demuxer and a decoder.
 * this is totally broken, palette changes should be sent as AVPackets
 *)
  TAVPaletteControl = record
    (* demuxer sets this to 1 to indicate the palette has changed;
     * decoder resets to 0 *)
    palette_changed: integer;

    (* 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 a IBM VGA native format, the component
     * data is probably 6 bits in size and needs to be scaled *)
    palette: array [0..AVPALETTE_COUNT - 1] of cardinal;
  end;

  PAVSubtitleRect = ^TAVSubtitleRect;
  TAVSubtitleRect = record
    x: word;
    y: word;
    w: word;
    h: word;
    nb_colors: word;
    linesize: integer;
    rgba_palette: PCardinal;
    bitmap: pchar;
  end;

  PAVSubtitle = ^TAVSubtitle;
  TAVSubtitle = record {20}
    format: word; (* 0 = graphics *)
    start_display_time: cardinal; (* relative to packet pts, in ms *)
    end_display_time: cardinal; (* relative to packet pts, in ms *)
    num_rects: cardinal;
    rects: PAVSubtitleRect;
  end;


(* resample.c *)

  PReSampleContext = pointer;
  PAVResampleContext = pointer;
  PImgReSampleContext = pointer;

function audio_resample_init (output_channels: integer; input_channels: integer;
                              output_rate: integer; input_rate: integer): PReSampleContext;
  cdecl; external av__codec;

function audio_resample (s: PReSampleContext; output: PWord; input: PWord; nb_samples: integer): integer;
  cdecl; external av__codec;

procedure audio_resample_close (s: PReSampleContext);
  cdecl; external av__codec;


function av_resample_init (out_rate: integer; in_rate: integer; filter_length: integer;
                           log2_phase_count: integer; linear: integer; cutoff: double): PAVResampleContext;
  cdecl; external av__codec;

function av_resample (c: PAVResampleContext; dst: PWord; src: PWord; consumed: PInteger;
                      src_size: integer; dst_size: integer; update_ctx: integer): integer;
  cdecl; external av__codec;

procedure av_resample_compensate (c: PAVResampleContext; sample_delta: integer;
                                  compensation_distance: integer);
  cdecl; external av__codec;

procedure av_resample_close (c: PAVResampleContext);
  cdecl; external av__codec;


(* YUV420 format is assumed ! *)

  function img_resample_init (output_width: integer; output_height: integer;
                             input_width: integer; input_height: integer): PImgReSampleContext;
    cdecl; external av__codec;

  function img_resample_full_init (owidth: integer; oheight: integer;
                                      iwidth: integer; iheight: integer;
                                      topBand: integer; bottomBand: integer;
                                      leftBand: integer; rightBand: integer;
                                      padtop: integer; padbottom: integer;
                                      padleft: integer; padright: integer): PImgReSampleContext;
    cdecl; external av__codec;

  procedure img_resample (s: PImgReSampleContext; output: PAVPicture; const input: PAVPicture);
    cdecl; external av__codec;

  procedure img_resample_close (s: PImgReSampleContext);
    cdecl; external av__codec;

(**
 * 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 0 if successful, -1 if not.
 *)
  function avpicture_alloc (picture: PAVPicture; pix_fmt: TAVPixelFormat;
                            width: integer; height: integer): integer;
    cdecl; external av__codec;


(* Free a picture previously allocated by avpicture_alloc. *)
  procedure avpicture_free (picture: PAVPicture);
    cdecl; external av__codec;

  function avpicture_fill (picture: PAVPicture; ptr: pointer;
                   pix_fmt: TAVPixelFormat; width: integer; height: integer): integer;
    cdecl; external av__codec;

  function avpicture_layout (const src: PAVPicture; pix_fmt: TAVPixelFormat;
                     width: integer; height: integer;
                     dest: pchar; dest_size: integer): integer;
    cdecl; external av__codec;

  function avpicture_get_size (pix_fmt: TAVPixelFormat; width: integer; height: integer): integer;
    cdecl; external av__codec;

  procedure avcodec_get_chroma_sub_sample (pix_fmt: TAVPixelFormat; h_shift: Pinteger; v_shift: pinteger);
    cdecl; external av__codec;

  function avcodec_get_pix_fmt_name(pix_fmt: TAVPixelFormat): pchar;
    cdecl; external av__codec;

  procedure avcodec_set_dimensions(s: PAVCodecContext; width: integer; height: integer);
    cdecl; external av__codec;

  function avcodec_get_pix_fmt(const name: pchar): TAVPixelFormat;
    cdecl; external av__codec;

  function avcodec_pix_fmt_to_codec_tag(p: TAVPixelFormat): cardinal;
    cdecl; external av__codec;

  function avcodec_get_pix_fmt_loss (dst_pix_fmt: TAVPixelFormat; src_pix_fmt: TAVPixelFormat;
                             has_alpha: integer): integer;
    cdecl; external av__codec;

  function avcodec_find_best_pix_fmt (pix_fmt_mask: integer; src_pix_fmt: TAVPixelFormat;
                              has_alpha: integer; loss_ptr: pinteger): integer;
    cdecl; external av__codec;

  function img_get_alpha_info (const src: PAVPicture;
		                           pix_fmt: TAVPixelFormat;
                               width: integer; height: integer): integer;
    cdecl; external av__codec;


(* convert among pixel formats *)
  function img_convert (dst: PAVPicture; dst_pix_fmt: TAVPixelFormat;
                const src: PAVPicture; pix_fmt: TAVPixelFormat;
                width: integer; height: integer): integer;
    cdecl; external av__codec;

(* deinterlace a picture *)
  function avpicture_deinterlace (dst: PAVPicture; const src: PAVPicture;
                          pix_fmt: TAVPixelFormat; width: integer; height: integer): integer;
    cdecl; external av__codec;

(* returns LIBAVCODEC_VERSION_INT constant *)
  function avcodec_version (): cardinal;
    cdecl; external av__codec;

(* returns LIBAVCODEC_BUILD constant *)
  function avcodec_build (): cardinal;
    cdecl; external av__codec;

  procedure avcodec_init ();
    cdecl; external av__codec;

  procedure register_avcodec (format: PAVCodec);
    cdecl; external av__codec;

  function avcodec_find_encoder (id: TCodecID): PAVCodec;
    cdecl; external av__codec;
  function avcodec_find_encoder_by_name (name: pchar): PAVCodec;
    cdecl; external av__codec;
  function avcodec_find_decoder(id: TCodecID): PAVCodec;
    cdecl; external av__codec;
  function avcodec_find_decoder_by_name (name: pchar): PAVCodec;
    cdecl; external av__codec;
  procedure avcodec_string(buf: pchar; buf_size: integer; enc: PAVCodecContext; encode: integer);
    cdecl; external av__codec;

  procedure avcodec_get_context_defaults (s: PAVCodecContext);
    cdecl; external av__codec;
  function avcodec_alloc_context (): PAVCodecContext;
    cdecl; external av__codec;
  procedure avcodec_get_frame_defaults (pic: PAVFrame);
    cdecl; external av__codec;
  function avcodec_alloc_frame (): PAVFrame;
    cdecl; external av__codec;

  function avcodec_default_get_buffer (s: PAVCodecContext; pic: PAVFrame): integer;
    cdecl; external av__codec;
  procedure avcodec_default_release_buffer (s: PAVCodecContext; pic: PAVFrame);
    cdecl; external av__codec;
  function avcodec_default_reget_buffer (s: PAVCodecContext; pic: PAVFrame): integer;
    cdecl; external av__codec;
  procedure avcodec_align_dimensions(s: PAVCodecContext; width: Pinteger; height: PInteger);
    cdecl; external av__codec;
  function avcodec_check_dimensions (av_log_ctx: pointer; w: cardinal; h: cardinal): integer;
    cdecl; external av__codec;
  function avcodec_default_get_format(s: PAVCodecContext; const fmt: PAVPixelFormat): TAVPixelFormat;
    cdecl; external av__codec;

  function avcodec_thread_init (s: PAVCodecContext; thread_count: integer): integer;
    cdecl; external av__codec;
  procedure avcodec_thread_free (s: PAVCodecContext);
    cdecl; external av__codec;
  function avcodec_thread_execute (s: PAVCodecContext; func: pointer; arg: PPointer; ret: Pinteger; count: integer): integer;
    cdecl; external av__codec;
  function avcodec_default_execute (s: PAVCodecContext; func: pointer; arg: PPointer; ret: Pinteger; count: integer): integer;
    cdecl; external av__codec;


//FIXME func typedef

(**
 * opens / inits the AVCodecContext.
 * not thread save!
 *)
  function avcodec_open (avctx: PAVCodecContext; codec: PAVCodec): integer;
    cdecl; external av__codec;


(**
 * Decode an audio frame.
 *
 * @param avctx the codec context.
 * @param samples output buffer, 16 byte aligned
 * @param frame_size_ptr the output buffer size in bytes, zero if no frame could be compressed
 * @param buf input buffer, 16 byte aligned
 * @param buf_size the input buffer size
 * @return 0 if successful, -1 if not.
 *)

  function avcodec_decode_audio (avctx: PAVCodecContext; samples: Pword;
                         frame_size_ptr: pinteger;
                         buf: pchar; buf_size: integer): integer;
    cdecl; external av__codec;
(* decode a frame.
 * @param buf bitstream buffer, must be FF_INPUT_BUFFER_PADDING_SIZE larger then the actual read bytes
 * because some optimized bitstream readers read 32 or 64 bit at once and could read over the end
 * @param buf_size the size of the buffer in bytes
 * @param got_picture_ptr zero if no frame could be decompressed, Otherwise, it is non zero
 * @return -1 if error, otherwise return the number of
 * bytes used. *)
  function avcodec_decode_video (avctx: PAVCodecContext; picture: PAVFrame;
                         got_picture_ptr: pinteger;
                         buf: PByte; buf_size: integer): integer;
    cdecl; external av__codec;

  function avcodec_decode_subtitle (avctx: PAVCodecContext; sub: PAVSubtitle;
                            got_sub_ptr: pinteger;
                            const buf: pchar; buf_size: integer): integer;
    cdecl; external av__codec;

  {$IFNDEF FPC}
  function avcodec_parse_frame (avctx: PAVCodecContext; pdata: PPointer;
                        data_size_ptr: pinteger;
                        buf: pchar; buf_size: integer): integer;
    cdecl; external av__codec;
  {$ENDIF}
  function avcodec_encode_audio (avctx: PAVCodecContext; buf: PByte;
                        buf_size: integer; const samples: Pword): integer;
    cdecl; external av__codec;

  (* avcodec_encode_video: -1 if error *)
  function avcodec_encode_video (avctx: PAVCodecContext; buf: pointer;
                        buf_size: integer; pict: PAVFrame): integer;
    cdecl; external av__codec;
  function avcodec_encode_subtitle (avctx: PAVCodecContext; buf: pchar;
                        buf_size: integer; const sub: PAVSubtitle): integer;
    cdecl; external av__codec;
  function avcodec_close (avctx: PAVCodecContext): integer;
    cdecl; external av__codec;

  procedure avcodec_register_all ();
    cdecl; external av__codec;

  procedure avcodec_flush_buffers (avctx: PAVCodecContext);
    cdecl; external av__codec;
  procedure avcodec_default_free_buffers (s: PAVCodecContext);
    cdecl; external av__codec;

(* misc usefull functions *)

(**
 * returns a single letter to describe the picture type
 *)
  function av_get_pict_type_char (pict_type: integer): char;
    cdecl; external av__codec;


(**
 * returns codec bits per sample
 *)
function av_get_bits_per_sample (codec_id: TCodecID): integer;
  cdecl; external av__codec;

const
  AV_PARSER_PTS_NB      = 4;
  PARSER_FLAG_COMPLETE_FRAMES = $0001;

type
  PAVCodecParserContext = ^TAVCodecParserContext;
  PAVCodecParser = ^TAVCodecParser;

  TAVCodecParserContext = record
    priv_data: pointer;
    parser: PAVCodecParser;
    frame_offset: int64; (* offset of the current frame *)
    cur_offset: int64; (* current offset (incremented by each av_parser_parse()) *)
    last_frame_offset: int64; (* offset of the last frame *)
    (* video info *)
    pict_type: integer; (* XXX: put it back in AVCodecContext *)
    repeat_pict: integer; (* XXX: put it back in AVCodecContext *)
    pts: int64;     (* pts of the current frame *)
    dts: int64;     (* dts of the current frame *)

    (* private data *)
    last_pts: int64;
    last_dts: int64;
    fetch_timestamp: integer;

    cur_frame_start_index: integer;
    cur_frame_offset: array [0..AV_PARSER_PTS_NB - 1] of int64;
    cur_frame_pts: array [0..AV_PARSER_PTS_NB - 1] of int64;
    cur_frame_dts: array [0..AV_PARSER_PTS_NB - 1] of int64;

    flags: integer;
  end;

  TAVCodecParser = record
    codec_ids: array [0..4] of integer; (* several codec IDs are permitted *)
    priv_data_size: integer;
    parser_init: function (s: PAVCodecParserContext): integer; cdecl;
    parser_parse: function (s: PAVCodecParserContext; avctx: PAVCodecContext;
                            poutbuf: PPointer; poutbuf_size: PInteger;
                            const buf: pchar; buf_size: integer): integer; cdecl;
    parser_close: procedure (s: PAVCodecParserContext); cdecl;
    split: function (avctx: PAVCodecContext; const buf: pchar;
                     buf_size: integer): integer; cdecl;
    next: PAVCodecParser;
  end;

  procedure av_register_codec_parser (parser: PAVCodecParser); cdecl;
    cdecl; external av__codec;

  function av_parser_init (codec_id: integer): PAVCodecParserContext;
    cdecl; external av__codec;

  function av_parser_parse (s: PAVCodecParserContext;
                    avctx: PAVCodecContext;
                    poutbuf: PPointer; poutbuf_size: pinteger;
                    const buf: pchar; buf_size: integer;
                    pts: int64; dts: int64): integer;
    cdecl; external av__codec;
  function av_parser_change (s: PAVCodecParserContext;
                     avctx: PAVCodecContext;
                     poutbuf: PPointer; poutbuf_size: PInteger;
                     const buf: pchar; buf_size: integer; keyframe: integer): integer;
    cdecl; external av__codec;
  procedure av_parser_close (s: PAVCodecParserContext);
    cdecl; external av__codec;

type
  PAVBitStreamFilterContext = ^TAVBitStreamFilterContext;
  PAVBitStreamFilter = ^TAVBitStreamFilter;

  TAVBitStreamFilterContext = record
    priv_data: pointer;
    filter: PAVBitStreamFilter;
    parser: PAVCodecParserContext;
    next: PAVBitStreamFilterContext;
  end;

  TAVBitStreamFilter = record
    name: pchar;
    priv_data_size: integer;
    filter: function (bsfc: PAVBitStreamFilterContext;
                  avctx: PAVCodecContext; args: pchar;
                  poutbuf: PPointer; poutbuf_size: PInteger;
                  buf: PByte; buf_size: integer; keyframe: integer): integer; cdecl;
    next: PAVBitStreamFilter;
  end;

procedure av_register_bitstream_filter (bsf: PAVBitStreamFilter);
  cdecl; external av__codec;

function av_bitstream_filter_init (name: pchar): PAVBitStreamFilterContext;
  cdecl; external av__codec;

function av_bitstream_filter_filter (bsfc: PAVBitStreamFilterContext;
                               avctx: PAVCodecContext; args: pchar;
                               poutbuf: PPointer; poutbuf_size: PInteger;
                               buf: PByte; buf_size: integer; keyframe: integer): integer;
  cdecl; external av__codec;
procedure av_bitstream_filter_close (bsf: PAVBitStreamFilterContext);
  cdecl; external av__codec;


(* memory *)
  procedure av_fast_realloc (ptr: pointer; size: PCardinal; min_size: Cardinal);
    cdecl; external av__codec;
(* for static data only *)
(* call av_free_static to release all staticaly allocated tables *)
  procedure  av_free_static ();
    cdecl; external av__codec;

  procedure av_mallocz_static(size: cardinal);
    cdecl; external av__codec;

  procedure av_realloc_static(ptr: pointer; size: Cardinal);
    cdecl; external av__codec;

  procedure img_copy (dst: PAVPicture; const src: PAVPicture;
                      pix_fmt: TAVPixelFormat; width: integer; height: integer);
    cdecl; external av__codec;

  function img_crop (dst: PAVPicture; const src: PAVPicture;
             pix_fmt: TAVPixelFormat; top_band, left_band: integer): integer;
    cdecl; external av__codec;

  function img_pad (dst: PAVPicture; const src: PAVPicture; height, width: integer;
                    pix_fmt: TAVPixelFormat; padtop, padbottom, padleft, padright: integer;
                    color: PInteger): integer;
    cdecl; external av__codec;

implementation

end.