first try of avcodec. I am sure it is still buggy.

git-svn-id: svn://svn.code.sf.net/p/ultrastardx/svn/trunk@2843 b956fd51-792f-4845-bead-9b4dfca2ff2c

3 files changed, 5006 insertions, 0 deletions

diff --git a/src/lib/ffmpeg7/audioconvert.pas b/src/lib/ffmpeg7/audioconvert.pas
new file mode 100644
index 00000000..f0c33e06
--- /dev/null
+++ b/src/lib/ffmpeg7/audioconvert.pas
@@ -0,0 +1,100 @@
+(*
+ * 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
+ *
+ * This is a part of the Pascal port of ffmpeg.
+ * - Changes and updates by the UltraStar Deluxe Team
+ *
+ * Conversion of libavutil/audioconvert.h
+ * avutil version 50.43.0
+ *
+ *)
+
+(**
+ * @file
+ * audio conversion routines
+ *)
+
+const
+  {* Audio channel masks *}
+  AV_CH_FRONT_LEFT             = $00000001;
+  AV_CH_FRONT_RIGHT            = $00000002;
+  AV_CH_FRONT_CENTER           = $00000004;
+  AV_CH_LOW_FREQUENCY          = $00000008;
+  AV_CH_BACK_LEFT              = $00000010;
+  AV_CH_BACK_RIGHT             = $00000020;
+  AV_CH_FRONT_LEFT_OF_CENTER   = $00000040;
+  AV_CH_FRONT_RIGHT_OF_CENTER  = $00000080;
+  AV_CH_BACK_CENTER            = $00000100;
+  AV_CH_SIDE_LEFT              = $00000200;
+  AV_CH_SIDE_RIGHT             = $00000400;
+  AV_CH_TOP_CENTER             = $00000800;
+  AV_CH_TOP_FRONT_LEFT         = $00001000;
+  AV_CH_TOP_FRONT_CENTER       = $00002000;
+  AV_CH_TOP_FRONT_RIGHT        = $00004000;
+  AV_CH_TOP_BACK_LEFT          = $00008000;
+  AV_CH_TOP_BACK_CENTER        = $00010000;
+  AV_CH_TOP_BACK_RIGHT         = $00020000;
+  AV_CH_STEREO_LEFT            = $20000000;  ///< Stereo downmix.
+  AV_CH_STEREO_RIGHT           = $40000000;  ///< See AV_CH_STEREO_LEFT.
+
+(** Channel mask value used for AVCodecContext.request_channel_layout
+ *  to indicate that the user requests the channel order of the decoder output
+ *  to be the native codec channel order.
+ *)
+  AV_CH_LAYOUT_NATIVE          = $8000000000000000;
+
+(* Audio channel convenience macros *)
+  AV_CH_LAYOUT_MONO            = (AV_CH_FRONT_CENTER);
+  AV_CH_LAYOUT_STEREO          = (AV_CH_FRONT_LEFT or AV_CH_FRONT_RIGHT);
+  AV_CH_LAYOUT_2_1             = (AV_CH_LAYOUT_STEREO or AV_CH_BACK_CENTER);
+  AV_CH_LAYOUT_SURROUND        = (AV_CH_LAYOUT_STEREO or AV_CH_FRONT_CENTER);
+  AV_CH_LAYOUT_4POINT0         = (AV_CH_LAYOUT_SURROUND or AV_CH_BACK_CENTER);
+  AV_CH_LAYOUT_2_2             = (AV_CH_LAYOUT_STEREO or AV_CH_SIDE_LEFT or AV_CH_SIDE_RIGHT);
+  AV_CH_LAYOUT_QUAD            = (AV_CH_LAYOUT_STEREO or AV_CH_BACK_LEFT or AV_CH_BACK_RIGHT);
+  AV_CH_LAYOUT_5POINT0         = (AV_CH_LAYOUT_SURROUND or AV_CH_SIDE_LEFT or AV_CH_SIDE_RIGHT);
+  AV_CH_LAYOUT_5POINT1         = (AV_CH_LAYOUT_5POINT0 or AV_CH_LOW_FREQUENCY);
+  AV_CH_LAYOUT_5POINT0_BACK    = (AV_CH_LAYOUT_SURROUND or AV_CH_BACK_LEFT or 
+                                  AV_CH_BACK_RIGHT);
+  AV_CH_LAYOUT_5POINT1_BACK    = (AV_CH_LAYOUT_5POINT0_BACK or AV_CH_LOW_FREQUENCY);
+  AV_CH_LAYOUT_7POINT0         = (AV_CH_LAYOUT_5POINT0 or AV_CH_BACK_LEFT or AV_CH_BACK_RIGHT);
+  AV_CH_LAYOUT_7POINT1         = (AV_CH_LAYOUT_5POINT1 or AV_CH_BACK_LEFT or AV_CH_BACK_RIGHT);
+  AV_CH_LAYOUT_7POINT1_WIDE    = (AV_CH_LAYOUT_5POINT1_BACK or 
+                                  AV_CH_FRONT_LEFT_OF_CENTER or
+                                  AV_CH_FRONT_RIGHT_OF_CENTER);
+  AV_CH_LAYOUT_STEREO_DOWNMIX  = (AV_CH_STEREO_LEFT or AV_CH_STEREO_RIGHT);
+
+(**
+ * Return a channel layout id that matches name, 0 if no match.
+ *)
+function av_get_channel_layout(name: {const} PAnsiChar): cint64;
+  cdecl; external av__util;
+
+(**
+ * Return a description of a channel layout.
+ * If nb_channels is <= 0, it is guessed from the channel_layout.
+ *
+ * @param buf put here the string containing the channel layout
+ * @param buf_size size in bytes of the buffer
+ *)
+procedure av_get_channel_layout_string(buf: PAnsiChar; buf_size: cint; nb_channels: cint; channel_layout: cint64);
+  cdecl; external av__util;
+
+(**
+ * Return the number of channels in the channel layout.
+ *)
+function av_get_channel_layout_nb_channels(channel_layout: cint64): cint;
+  cdecl; external av__util;
diff --git a/src/lib/ffmpeg7/avcodec.pas b/src/lib/ffmpeg7/avcodec.pas
new file mode 100644
index 00000000..8c181c33
--- /dev/null
+++ b/src/lib/ffmpeg7/avcodec.pas
@@ -0,0 +1,4748 @@
+(*
+ * 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
+ *
+ * This is a part of Pascal porting of ffmpeg.
+ * - Originally by Victor Zinetz for Delphi and Free Pascal on Windows.
+ * - For Mac OS X, some modifications were made by The Creative CAT, denoted as CAT
+ *   in the source codes.
+ * - Changes and updates by the UltraStar Deluxe Team
+ *
+ * Conversion of libavcodec/avcodec.h
+ * version: 52.122.0
+ *
+ *)
+
+unit avcodec;
+
+{$IFDEF FPC}
+  {$MODE DELPHI }
+  {$PACKENUM 4}    (* use 4-byte enums *)
+  {$PACKRECORDS C} (* C/C++-compatible record packing *)
+{$ELSE}
+  {$MINENUMSIZE 4} (* use 4-byte enums *)
+{$ENDIF}
+
+{$IFDEF DARWIN}
+  {$linklib libavcodec}
+{$ENDIF}
+
+interface
+
+uses
+  ctypes,
+  avutil,
+  rational,
+  opt,
+  samplefmt,
+  SysUtils,
+  {$IFDEF UNIX}
+  BaseUnix,
+  {$ENDIF}
+  UConfig;
+
+const
+  (*
+   * IMPORTANT: The official FFmpeg C headers change very quickly. Often some
+   * of the data structures are changed so that they become incompatible with
+   * older header files. The Pascal headers have to be adjusted to those changes,
+   * otherwise the application might crash randomly or strange bugs (not
+   * necessarily related to video or audio due to buffer overflows etc.) might
+   * occur.
+   *
+   * In the past users reported problems with USDX that took hours to fix and
+   * the problem was an unsupported version of FFmpeg. So we decided to disable
+   * support for future versions of FFmpeg until the headers are revised by us
+   * for that version as they otherwise most probably will break USDX.
+   *
+   * If the headers do not yet support your FFmpeg version you may want to
+   * adjust the max. version numbers manually but please note: it may work but
+   * in many cases it does not. The USDX team does NOT PROVIDE ANY SUPPORT
+   * for the game if the MAX. VERSION WAS CHANGED.
+   *
+   * The only safe way to support new versions of FFmpeg is to add the changes
+   * of the FFmpeg git repository C headers to the Pascal headers.
+   * You can accelerate this process by posting a patch with the git changes
+   * translated to Pascal to our bug tracker (please join our IRC chat before
+   * you start working on it). Simply adjusting the max. versions is NOT a valid
+   * fix. 
+   *)
+  (* Supported version by this header *)
+  LIBAVCODEC_MAX_VERSION_MAJOR   = 52;
+  LIBAVCODEC_MAX_VERSION_MINOR   = 122;
+  LIBAVCODEC_MAX_VERSION_RELEASE = 0;
+  LIBAVCODEC_MAX_VERSION = (LIBAVCODEC_MAX_VERSION_MAJOR * VERSION_MAJOR) +
+                           (LIBAVCODEC_MAX_VERSION_MINOR * VERSION_MINOR) +
+                           (LIBAVCODEC_MAX_VERSION_RELEASE * VERSION_RELEASE);
+
+  (* Min. supported version by this header *)
+  LIBAVCODEC_MIN_VERSION_MAJOR   = 52;
+  LIBAVCODEC_MIN_VERSION_MINOR   = 122;
+  LIBAVCODEC_MIN_VERSION_RELEASE = 0;
+  LIBAVCODEC_MIN_VERSION = (LIBAVCODEC_MIN_VERSION_MAJOR * VERSION_MAJOR) +
+                            (LIBAVCODEC_MIN_VERSION_MINOR * VERSION_MINOR) +
+                            (LIBAVCODEC_MIN_VERSION_RELEASE * VERSION_RELEASE);
+
+(* Check if linked versions are supported *)
+{$IF (LIBAVCODEC_VERSION < LIBAVCODEC_MIN_VERSION)}
+  {$MESSAGE Error 'Linked version of libavcodec is too old!'}
+{$IFEND}
+
+(* Check if linked version is supported *)
+{$IF (LIBAVCODEC_VERSION > LIBAVCODEC_MAX_VERSION)}
+  {$MESSAGE Error 'Linked version of libavcodec is not yet supported!'}
+{$IFEND}
+
+(**
+ * Those FF_API_* defines are not part of public API.
+ * They may change, break or disappear at any time.
+ *)
+const
+{$ifndef FF_API_PALETTE_CONTROL}
+  FF_API_PALETTE_CONTROL = LIBAVCODEC_VERSION_MAJOR < 54;    
+{$endif}
+{$ifndef FF_API_MM_FLAGS}
+  FF_API_MM_FLAGS = LIBAVCODEC_VERSION_MAJOR < 53;    
+{$endif}
+{$ifndef FF_API_OPT_SHOW}
+  FF_API_OPT_SHOW = LIBAVCODEC_VERSION_MAJOR < 53;    
+{$endif}
+{$ifndef FF_API_AUDIO_OLD}
+  FF_API_AUDIO_OLD = LIBAVCODEC_VERSION_MAJOR < 53;    
+{$endif}
+{$ifndef FF_API_VIDEO_OLD}
+  FF_API_VIDEO_OLD = LIBAVCODEC_VERSION_MAJOR < 53;    
+{$endif}
+{$ifndef FF_API_SUBTITLE_OLD}
+  FF_API_SUBTITLE_OLD = LIBAVCODEC_VERSION_MAJOR < 53;    
+{$endif}
+{$ifndef FF_API_USE_LPC}
+  FF_API_USE_LPC = LIBAVCODEC_VERSION_MAJOR < 53;    
+{$endif}
+{$ifndef FF_API_SET_STRING_OLD}
+  FF_API_SET_STRING_OLD = LIBAVCODEC_VERSION_MAJOR < 53;    
+{$endif}
+{$ifndef FF_API_INOFFICIAL}
+  FF_API_INOFFICIAL = LIBAVCODEC_VERSION_MAJOR < 53;    
+{$endif}
+{$ifndef FF_API_OLD_SAMPLE_FMT}
+  FF_API_OLD_SAMPLE_FMT = LIBAVCODEC_VERSION_MAJOR < 54;    
+{$endif}
+{$ifndef FF_API_OLD_AUDIOCONVERT}
+  FF_API_OLD_AUDIOCONVERT = LIBAVCODEC_VERSION_MAJOR < 54;    
+{$endif}
+{$ifndef FF_API_HURRY_UP}
+  FF_API_HURRY_UP = LIBAVCODEC_VERSION_MAJOR < 53;    
+{$endif}
+{$ifndef FF_API_RATE_EMU}
+  FF_API_RATE_EMU = LIBAVCODEC_VERSION_MAJOR < 53;    
+{$endif}
+{$ifndef FF_API_MB_Q}
+  FF_API_MB_Q = LIBAVCODEC_VERSION_MAJOR < 53;    
+{$endif}
+{$ifndef FF_API_ANTIALIAS_ALGO}
+  FF_API_ANTIALIAS_ALGO = LIBAVCODEC_VERSION_MAJOR < 54;    
+{$endif}
+{$ifndef FF_API_REQUEST_CHANNELS}
+  FF_API_REQUEST_CHANNELS = LIBAVCODEC_VERSION_MAJOR < 54;    
+{$endif}
+{$ifndef FF_API_OPT_H}
+  FF_API_OPT_H = LIBAVCODEC_VERSION_MAJOR < 54;    
+{$endif}
+{$ifndef FF_API_THREAD_INIT}
+  FF_API_THREAD_INIT = LIBAVCODEC_VERSION_MAJOR < 54;    
+{$endif}
+{$ifndef FF_API_OLD_FF_PICT_TYPES}
+  FF_API_OLD_FF_PICT_TYPES = LIBAVCODEC_VERSION_MAJOR < 54;    
+{$endif}
+{$ifndef FF_API_FLAC_GLOBAL_OPTS}
+  FF_API_FLAC_GLOBAL_OPTS = LIBAVCODEC_VERSION_MAJOR < 54;    
+{$endif}
+{$ifndef FF_API_GET_PIX_FMT_NAME}
+  FF_API_GET_PIX_FMT_NAME = LIBAVCODEC_VERSION_MAJOR < 54;    
+{$endif}
+
+type
+  FF_INTERNALC_MEM_TYPE = cuint;
+  
+const
+  AV_NOPTS_VALUE: cint64  = $8000000000000000;
+  AV_TIME_BASE            = 1000000;
+  AV_TIME_BASE_Q: TAVRational = (num: 1; den: AV_TIME_BASE);
+
+(**
+ * Identify the syntax and semantics of the bitstream.
+ * The principle is roughly:
+ * Two decoders with the same ID can decode the same streams.
+ * Two encoders with the same ID can encode compatible streams.
+ * There may be slight deviations from the principle due to implementation
+ * details.
+ *
+ * If you add a codec ID to this list, add it so that
+ * 1. no value of a existing codec ID changes (that would break ABI),
+ * 2. it is as close as possible to similar codecs.
+ *)
+type
+  TCodecID = (
+    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,
+{$IF LIBAVCODEC_VERSION_MAJOR < 53}
+    CODEC_ID_XVID,
+{$IFEND}
+    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,
+    CODEC_ID_AURA,
+    CODEC_ID_AURA2,
+    CODEC_ID_V210X,
+    CODEC_ID_TMV,
+    CODEC_ID_V210,
+    CODEC_ID_DPX,
+    CODEC_ID_MAD,
+    CODEC_ID_FRWU,
+    CODEC_ID_FLASHSV2,
+    CODEC_ID_CDGRAPHICS,
+    CODEC_ID_R210,
+    CODEC_ID_ANM,
+    CODEC_ID_BINKVIDEO,
+    CODEC_ID_IFF_ILBM,
+    CODEC_ID_IFF_BYTERUN1,
+    CODEC_ID_KGV1,
+    CODEC_ID_YOP,
+    CODEC_ID_VP8,
+    CODEC_ID_PICTOR,
+    CODEC_ID_ANSI,
+    CODEC_ID_A64_MULTI,
+    CODEC_ID_A64_MULTI5,
+    CODEC_ID_R10K,
+    CODEC_ID_MXPEG,
+    CODEC_ID_LAGARITH,
+    CODEC_ID_PRORES,
+    CODEC_ID_JV,
+    CODEC_ID_DFA,
+    CODEC_ID_8SVX_RAW,
+
+    //* 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,
+    CODEC_ID_PCM_ZORK,
+    CODEC_ID_PCM_S16LE_PLANAR,
+    CODEC_ID_PCM_DVD,
+    CODEC_ID_PCM_F32BE,
+    CODEC_ID_PCM_F32LE,
+    CODEC_ID_PCM_F64BE,
+    CODEC_ID_PCM_F64LE,
+    CODEC_ID_PCM_BLURAY,
+    CODEC_ID_PCM_LXF,
+    CODEC_ID_S302M,
+
+    //* 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,
+    CODEC_ID_ADPCM_THP,
+    CODEC_ID_ADPCM_IMA_AMV,
+    CODEC_ID_ADPCM_EA_R1,
+    CODEC_ID_ADPCM_EA_R3,
+    CODEC_ID_ADPCM_EA_R2,
+    CODEC_ID_ADPCM_IMA_EA_SEAD,
+    CODEC_ID_ADPCM_IMA_EA_EACS,
+    CODEC_ID_ADPCM_EA_XAS,
+    CODEC_ID_ADPCM_EA_MAXIS_XA,
+    CODEC_ID_ADPCM_IMA_ISS,
+    CODEC_ID_ADPCM_G722,
+
+    //* AMR */
+    CODEC_ID_AMR_NB= $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,
+
+    //* audio codecs */
+    CODEC_ID_MP2= $15000,
+    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,
+    CODEC_ID_TWINVQ,
+    CODEC_ID_TRUEHD,
+    CODEC_ID_MP4ALS,
+    CODEC_ID_ATRAC1,
+    CODEC_ID_BINKAUDIO_RDFT,
+    CODEC_ID_BINKAUDIO_DCT,
+    CODEC_ID_AAC_LATM,
+    CODEC_ID_QDMC,
+    CODEC_ID_CELT,
+
+    //* subtitle codecs */
+    CODEC_ID_DVD_SUBTITLE= 0x17000,
+    CODEC_ID_DVB_SUBTITLE,
+    CODEC_ID_TEXT,  ///< raw UTF-8 text
+    CODEC_ID_XSUB,
+    CODEC_ID_SSA,
+    CODEC_ID_MOV_TEXT,
+    CODEC_ID_HDMV_PGS_SUBTITLE,
+    CODEC_ID_DVB_TELETEXT,
+    CODEC_ID_SRT,
+    CODEC_ID_MICRODVD,
+
+    //* other specific kind of codecs (generally used for attachments) */
+    CODEC_ID_TTF= $18000,
+
+    CODEC_ID_PROBE= $19000, ///< codec_id is not known (like CODEC_ID_NONE) but lavf should attempt to identify it
+
+    CODEC_ID_MPEG2TS= $20000, (**< _FAKE_ codec to indicate a raw MPEG-2 TS
+                               * stream (only used by libavformat) *)
+    CODEC_ID_FFMETADATA= $21000   ///< Dummy codec for streams containing only metadata information.
+  );
+
+type
+  TCodecType = TAVMediaType;
+
+const
+  CODEC_TYPE_UNKNOWN    = AVMEDIA_TYPE_UNKNOWN;
+  CODEC_TYPE_VIDEO      = AVMEDIA_TYPE_VIDEO;
+  CODEC_TYPE_AUDIO      = AVMEDIA_TYPE_AUDIO;
+  CODEC_TYPE_DATA       = AVMEDIA_TYPE_DATA;
+  CODEC_TYPE_SUBTITLE   = AVMEDIA_TYPE_SUBTITLE;
+  CODEC_TYPE_ATTACHMENT = AVMEDIA_TYPE_ATTACHMENT;
+  CODEC_TYPE_NB         = AVMEDIA_TYPE_NB;
+  );
+
+{$IFDEF FF_API_OLD_AUDIOCONVERT}
+
+{$I audioconvert.pas}
+
+const
+  {* Audio channel masks *}
+  CH_FRONT_LEFT             = AV_CH_FRONT_LEFT;
+  CH_FRONT_RIGHT            = AV_CH_FRONT_RIGHT;
+  CH_FRONT_CENTER           = AV_CH_FRONT_CENTER;
+  CH_LOW_FREQUENCY          = AV_CH_LOW_FREQUENCY;
+  CH_BACK_LEFT              = AV_CH_BACK_LEFT;
+  CH_BACK_RIGHT             = AV_CH_BACK_RIGHT;
+  CH_FRONT_LEFT_OF_CENTER   = AV_CH_FRONT_LEFT_OF_CENTER;
+  CH_FRONT_RIGHT_OF_CENTER  = AV_CH_FRONT_RIGHT_OF_CENTER;
+  CH_BACK_CENTER            = AV_CH_BACK_CENTER;
+  CH_SIDE_LEFT              = AV_CH_SIDE_LEFT;
+  CH_SIDE_RIGHT             = AV_CH_SIDE_RIGHT;
+  CH_TOP_CENTER             = AV_CH_TOP_CENTER;
+  CH_TOP_FRONT_LEFT         = AV_CH_TOP_FRONT_LEFT;
+  CH_TOP_FRONT_CENTER       = AV_CH_TOP_FRONT_CENTER;
+  CH_TOP_FRONT_RIGHT        = AV_CH_TOP_FRONT_RIGHT;
+  CH_TOP_BACK_LEFT          = AV_CH_TOP_BACK_LEFT;
+  CH_TOP_BACK_CENTER        = AV_CH_TOP_BACK_CENTER;
+  CH_TOP_BACK_RIGHT         = AV_CH_TOP_BACK_RIGHT;
+  CH_STEREO_LEFT            = AV_CH_STEREO_LEFT;
+  CH_STEREO_RIGHT           = AV_CH_STEREO_RIGHT;
+
+{** Channel mask value used for AVCodecContext.request_channel_layout
+ *  to indicate that the user requests the channel order of the decoder output
+ *  to be the native codec channel order.
+ *}
+  CH_LAYOUT_NATIVE          = AV_CH_LAYOUT_NATIVE;
+
+  {* Audio channel convenience macros *}
+  CH_LAYOUT_MONO            = AV_CH_LAYOUT_MONO;
+  CH_LAYOUT_STEREO          = AV_CH_LAYOUT_STEREO;
+  CH_LAYOUT_2_1             = AV_CH_LAYOUT_2_1;
+  CH_LAYOUT_SURROUND        = AV_CH_LAYOUT_SURROUND;
+  CH_LAYOUT_4POINT0         = AV_CH_LAYOUT_4POINT0;
+  CH_LAYOUT_2_2             = AV_CH_LAYOUT_2_2;
+  CH_LAYOUT_QUAD            = AV_CH_LAYOUT_QUAD;
+  CH_LAYOUT_5POINT0         = AV_CH_LAYOUT_5POINT0;
+  CH_LAYOUT_5POINT1         = AV_CH_LAYOUT_5POINT1;
+  CH_LAYOUT_5POINT0_BACK    = AV_CH_LAYOUT_5POINT0_BACK;
+  CH_LAYOUT_5POINT1_BACK    = AV_CH_LAYOUT_5POINT1_BACK;
+  CH_LAYOUT_7POINT0         = AV_CH_LAYOUT_7POINT0;
+  CH_LAYOUT_7POINT1         = AV_CH_LAYOUT_7POINT1;
+  CH_LAYOUT_7POINT1_WIDE    = AV_CH_LAYOUT_7POINT1_WIDE;
+  CH_LAYOUT_STEREO_DOWNMIX  = AV_CH_LAYOUT_STEREO_DOWNMIX;
+{$IFEND}
+
+{* 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.
+ *}
+  TMotion_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
+  );
+
+  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
+  );
+
+  TAVColorPrimaries = (
+    AVCOL_PRI_BT709       = 1, ///< also ITU-R BT1361 / IEC 61966-2-4 / SMPTE RP177 Annex B
+    AVCOL_PRI_UNSPECIFIED = 2,
+    AVCOL_PRI_BT470M      = 4,
+    AVCOL_PRI_BT470BG     = 5, ///< also ITU-R BT601-6 625 / ITU-R BT1358 625 / ITU-R BT1700 625 PAL & SECAM
+    AVCOL_PRI_SMPTE170M   = 6, ///< also ITU-R BT601-6 525 / ITU-R BT1358 525 / ITU-R BT1700 NTSC
+    AVCOL_PRI_SMPTE240M   = 7, ///< functionally identical to above
+    AVCOL_PRI_FILM        = 8,
+    AVCOL_PRI_NB               ///< Not part of ABI
+  );
+
+  TAVColorTransferCharacteristic = (
+    AVCOL_TRC_BT709       = 1, ///< also ITU-R BT1361
+    AVCOL_TRC_UNSPECIFIED = 2,
+    AVCOL_TRC_GAMMA22     = 4, ///< also ITU-R BT470M / ITU-R BT1700 625 PAL & SECAM
+    AVCOL_TRC_GAMMA28     = 5, ///< also ITU-R BT470BG
+    AVCOL_TRC_NB               ///< Not part of ABI
+  );
+
+  TAVColorSpace = (
+    AVCOL_SPC_RGB         = 0,
+    AVCOL_SPC_BT709       = 1, ///< also ITU-R BT1361 / IEC 61966-2-4 xvYCC709 / SMPTE RP177 Annex B
+    AVCOL_SPC_UNSPECIFIED = 2,
+    AVCOL_SPC_FCC         = 4,
+    AVCOL_SPC_BT470BG     = 5, ///< also ITU-R BT601-6 625 / ITU-R BT1358 625 / ITU-R BT1700 625 PAL & SECAM / IEC 61966-2-4 xvYCC601
+    AVCOL_SPC_SMPTE170M   = 6, ///< also ITU-R BT601-6 525 / ITU-R BT1358 525 / ITU-R BT1700 NTSC / functionally identical to above
+    AVCOL_SPC_SMPTE240M   = 7,
+    AVCOL_SPC_NB               ///< Not part of ABI
+  );
+
+  TAVColorRange = (
+    AVCOL_RANGE_UNSPECIFIED = 0,
+    AVCOL_RANGE_MPEG        = 1, ///< the normal 219*2^(n-8) "MPEG" YUV ranges
+    AVCOL_RANGE_JPEG        = 2, ///< the normal     2^n-1   "JPEG" YUV ranges
+    AVCOL_RANGE_NB               ///< Not part of ABI
+  );
+
+(**
+ *  X   X      3 4 X      X are luma samples,
+ *             1 2        1-6 are possible chroma positions
+ *  X   X      5 6 X      0 is undefined/unknown position
+ *)
+  TAVChromaLocation = (
+    AVCHROMA_LOC_UNSPECIFIED = 0,
+    AVCHROMA_LOC_LEFT        = 1, ///< mpeg2/4, h264 default
+    AVCHROMA_LOC_CENTER      = 2, ///< mpeg1, jpeg, h263
+    AVCHROMA_LOC_TOPLEFT     = 3, ///< DV
+    AVCHROMA_LOC_TOP         = 4,
+    AVCHROMA_LOC_BOTTOMLEFT  = 5,
+    AVCHROMA_LOC_BOTTOM      = 6,
+    AVCHROMA_LOC_NB               ///< Not part of ABI
+  );
+
+{$IFDEF FF_API_FLAC_GLOBAL_OPTS}
+(**
+ * LPC analysis type
+ *)
+  TAVLPCType = (
+    AV_LPC_TYPE_DEFAULT     = -1, ///< use the codec default LPC type
+    AV_LPC_TYPE_NONE        =  0, ///< do not use LPC prediction or use all zero coefficients
+    AV_LPC_TYPE_FIXED       =  1, ///< fixed LPC coefficients
+    AV_LPC_TYPE_LEVINSON    =  2, ///< Levinson-Durbin recursion
+    AV_LPC_TYPE_CHOLESKY    =  3, ///< Cholesky factorization
+    AV_LPC_TYPE_NB                ///< Not part of ABI
+  );
+{$IFEND}
+
+  TAVAudioServiceType =(
+    AV_AUDIO_SERVICE_TYPE_MAIN              = 0,
+    AV_AUDIO_SERVICE_TYPE_EFFECTS           = 1,
+    AV_AUDIO_SERVICE_TYPE_VISUALLY_IMPAIRED = 2,
+    AV_AUDIO_SERVICE_TYPE_HEARING_IMPAIRED  = 3,
+    AV_AUDIO_SERVICE_TYPE_DIALOGUE          = 4,
+    AV_AUDIO_SERVICE_TYPE_COMMENTARY        = 5,
+    AV_AUDIO_SERVICE_TYPE_EMERGENCY         = 6,
+    AV_AUDIO_SERVICE_TYPE_VOICE_OVER        = 7,
+    AV_AUDIO_SERVICE_TYPE_KARAOKE           = 8,
+    AV_AUDIO_SERVICE_TYPE_NB                     ///< Not part of ABI
+  );
+
+  PRcOverride = ^TRcOverride;
+  TRcOverride = record {16}
+    start_frame:    cint;
+    end_frame:      cint;
+    qscale:         cint; // if this is 0 then quality_factor will be used instead
+    quality_factor: cfloat;
+  end;
+
+const
+  FF_MAX_B_FRAMES = 16;
+
+{* encoding support
+   These flags can be passed in AVCodecContext.flags before initialization.
+   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.
+  {**
+   * 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.
+   *}
+  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_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_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)
+  CODEC_FLAG2_DROP_FRAME_TIMECODE = $00002000; ///< timecode is in drop frame format.
+  CODEC_FLAG2_SKIP_RD       = $00004000; ///< RD optimal MB level residual skipping
+  CODEC_FLAG2_CHUNKS        = $00008000; ///< Input bitstream might be truncated at a packet boundaries instead of only at frame boundaries.
+  CODEC_FLAG2_NON_LINEAR_QUANT = $00010000; ///< Use MPEG-2 nonlinear quantizer.
+  CODEC_FLAG2_BIT_RESERVOIR = $00020000; ///< Use a bit reservoir when encoding if possible
+  CODEC_FLAG2_MBTREE        = $00040000; ///< Use macroblock tree ratecontrol (x264 only)
+  CODEC_FLAG2_PSY           = $00080000; ///< Use psycho visual optimizations.
+  CODEC_FLAG2_SSIM          = $00100000; ///< Compute SSIM during encoding, error[] values are undefined.
+  CODEC_FLAG2_INTRA_REFRESH = $00200000; ///< Use periodic insertion of intra blocks instead of keyframes.
+
+(* Unsupported options :
+ *              Syntax Arithmetic coding (SAC)
+ *              Reference Picture Selection
+ *              Independant Segment Decoding *)
+(* /Fx *)
+(* codec capabilities *)
+
+  CODEC_CAP_DRAW_HORIZ_BAND = $0001; ///< decoder can use draw_horiz_band callback
+
+  (**
+   * Codec uses get_buffer() for allocating buffers and supports custom allocators.
+   * If not set, it might not use get_buffer() at all or use operations that
+   * assume the buffer was allocated by avcodec_default_get_buffer.
+   *)
+  CODEC_CAP_DR1             = $0002;
+  (* if 'parse_only' field is true, then avcodec_parse_frame() can be used *)
+  CODEC_CAP_PARSE_ONLY      = $0004;
+  CODEC_CAP_TRUNCATED       = $0008;
+
+  (* codec can export data for HW decoding (XvMC) *)
+  CODEC_CAP_HWACCEL         = $0010;
+
+  (**
+   * 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;
+
+  (**
+   * Codec can export data for HW decoding (VDPAU).
+   *)
+  CODEC_CAP_HWACCEL_VDPAU    = $0080;
+
+  (**
+   * Codec can output multiple frames per AVPacket
+   * Normally demuxers return one frame at a time, demuxers which do not do
+   * are connected to a parser to split what they return into proper frames.
+   * This flag is reserved to the very rare category of codecs which have a
+   * bitstream that cannot be split into frames without timeconsuming
+   * operations like full decoding. Demuxers carring such bitstreams thus
+   * may return multiple frames in a packet. This has many disadvantages like
+   * prohibiting stream copy in many cases thus it should only be considered
+   * as a last resort.
+   *)
+  CODEC_CAP_SUBFRAMES        = $0100;
+
+  (**
+   * Codec is experimental and is thus avoided in favor of non experimental
+   * encoders
+   *)
+  CODEC_CAP_EXPERIMENTAL     = $0200;
+
+  (**
+   * Codec should fill in channel configuration and samplerate instead of container
+   *)
+  CODEC_CAP_CHANNEL_CONF     = $0400;
+  
+  (**
+   * Codec is able to deal with negative linesizes
+   *)
+  CODEC_CAP_NEG_LINESIZES    = $0800;
+  
+  (**
+   * Codec supports frame-level multithreading.
+   *)
+  CODEC_CAP_FRAME_THREADS    = $1000;
+
+  (**
+   * Codec supports slice-based (or partition-based) multithreading.
+   *)
+  CODEC_CAP_SLICE_THREADS    = $2000;
+
+  (**
+   * Codec is lossless.
+   *)
+  CODEC_CAP_LOSSLESS         = $80000000;
+
+   //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        = $0020000;
+   //Note bits 24-31 are reserved for codec specific use (h264 ref0, mpeg1 0mv, ...)
+
+type
+(**
+ * Pan Scan area.
+ * This specifies the area which should be displayed.
+ * Note there may be multiple such areas for one frame.
+ *)
+  PAVPanScan = ^TAVPanScan;
+  TAVPanScan = record {24}
+    (*** id.
+     * - encoding: set by user.
+     * - decoding: set by libavcodec. *)
+    id: cint;
+
+    (*** width and height in 1/16 pel
+     * - encoding: set by user.
+     * - decoding: set by libavcodec. *)
+    width: cint;
+    height: cint;
+
+    (*** position of the top left corner in 1/16 pel for up to 3 fields/frames.
+     * - encoding: set by user.
+     * - decoding: set by libavcodec. *)
+    position: array [0..2] of array [0..1] of cint16;
+  end; {TAVPanScan}
+
+const
+  FF_QSCALE_TYPE_MPEG1  = 0;
+  FF_QSCALE_TYPE_MPEG2  = 1;
+  FF_QSCALE_TYPE_H264   = 2;
+  FF_QSCALE_TYPE_VP56   = 3;
+
+  FF_BUFFER_TYPE_INTERNAL = 1;
+  FF_BUFFER_TYPE_USER     = 2; ///< Direct rendering buffers (image is (de)allocated by user)
+  FF_BUFFER_TYPE_SHARED   = 4; ///< buffer from somewhere else, don't dealloc image (data/base), all other tables are not shared
+  FF_BUFFER_TYPE_COPY     = 8; ///< just a (modified) copy of some other buffer, don't dealloc anything.
+
+{$IFDEF FF_API_OLD_FF_PICT_TYPES}
+(* DEPRECATED, directly use the AV_PICTURE_TYPE_* enum values *)
+  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; ///< Switching Intra
+  FF_SP_TYPE = 6; ///< Switching Predicted
+  FF_BI_TYPE = 7;
+{$IFEND}
+
+  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 = $08; // Codec will reuse the buffer (update)
+
+  FF_ASPECT_EXTENDED = 15;
+
+  FF_RC_STRATEGY_XVID = 1;
+
+  FF_BUG_AUTODETECT       = 1;  ///< autodetection
+  FF_BUG_OLD_MSMPEG4      = 2;
+  FF_BUG_XVID_ILACE       = 4;
+  FF_BUG_UMP4             = 8;
+  FF_BUG_NO_PADDING       = 16;
+  FF_BUG_AMV              = 32;
+  FF_BUG_AC_VLC           = 0;  ///< will be removed, libavcodec can now handle these non compliant files by default
+  FF_BUG_QPEL_CHROMA      = 64;
+  FF_BUG_STD_QPEL         = 128;
+  FF_BUG_QPEL_CHROMA2     = 256;
+  FF_BUG_DIRECT_BLOCKSIZE = 512;
+  FF_BUG_EDGE             = 1024;
+  FF_BUG_HPEL_CHROMA      = 2048;
+  FF_BUG_DC_CLIP          = 4096;
+  FF_BUG_MS               = 8192; ///< workaround various bugs in microsofts broken decoders
+  FF_BUG_TRUNCATED        = 16384;
+  //FF_BUG_FAKE_SCALABILITY = 16 //Autodetection should work 100%.
+
+  FF_COMPLIANCE_VERY_STRICT   =  2; ///< strictly conform to an older more strict version of the spec or reference software
+  FF_COMPLIANCE_STRICT        =  1; ///< strictly conform to all the things in the spec no matter what consequences
+  FF_COMPLIANCE_NORMAL        =  0;
+  {$IFDEF FF_API_INOFFICIAL}
+  FF_COMPLIANCE_INOFFICIAL    = -1; ///< Allow inofficial extensions
+  {$IFEND}
+  FF_COMPLIANCE_UNOFFICIAL    = -1; ///< Allow unofficial extensions
+  FF_COMPLIANCE_EXPERIMENTAL  = -2; ///< Allow nonstandardized experimental things.
+
+  FF_ER_CAREFUL         = 1;
+  FF_ER_COMPLIANT       = 2;
+  FF_ER_AGGRESSIVE      = 3;
+  FF_ER_VERY_AGGRESSIVE = 4;
+
+  FF_DCT_AUTO    = 0;
+  FF_DCT_FASTINT = 1;
+  FF_DCT_INT     = 2;
+  FF_DCT_MMX     = 3;
+  FF_DCT_MLIB    = 4;
+  FF_DCT_ALTIVEC = 5;
+  FF_DCT_FAAN    = 6;
+
+  FF_IDCT_AUTO         = 0;
+  FF_IDCT_INT          = 1;
+  FF_IDCT_SIMPLE       = 2;
+  FF_IDCT_SIMPLEMMX    = 3;
+  FF_IDCT_LIBMPEG2MMX  = 4;
+  FF_IDCT_PS2          = 5;
+  FF_IDCT_MLIB         = 6;
+  FF_IDCT_ARM          = 7;
+  FF_IDCT_ALTIVEC      = 8;
+  FF_IDCT_SH4          = 9;
+  FF_IDCT_SIMPLEARM    = 10;
+  FF_IDCT_H264         = 11;
+  FF_IDCT_VP3          = 12;
+  FF_IDCT_IPP          = 13;
+  FF_IDCT_XVIDMMX      = 14;
+  FF_IDCT_CAVS         = 15;
+  FF_IDCT_SIMPLEARMV5TE= 16;
+  FF_IDCT_SIMPLEARMV6  = 17;
+  FF_IDCT_SIMPLEVIS    = 18;
+  FF_IDCT_WMV2         = 19;
+  FF_IDCT_FAAN         = 20;
+  FF_IDCT_EA           = 21;
+  FF_IDCT_SIMPLENEON   = 22;
+  FF_IDCT_SIMPLEALPHA  = 23;
+  FF_IDCT_BINK         = 24;
+
+  FF_EC_GUESS_MVS   = 1;
+  FF_EC_DEBLOCK     = 2;
+
+{$IFDEF FF_API_MM_FLAGS}
+  FF_MM_FORCE       = AV_CPU_FLAG_FORCE;
+  FF_MM_MMX         = AV_CPU_FLAG_MMX;
+  FF_MM_3DNOW       = AV_CPU_FLAG_3DNOW;
+  FF_MM_MMXEXT      = AV_CPU_FLAG_MMX2;
+  FF_MM_MMX2        = AV_CPU_FLAG_MMX2;
+  FF_MM_SSE         = AV_CPU_FLAG_SSE;
+  FF_MM_SSE2        = AV_CPU_FLAG_SSE2;
+  FF_MM_SSE2SLOW    = AV_CPU_FLAG_SSE2SLOW;
+  FF_MM_3DNOWEXT    = AV_CPU_FLAG_3DNOWEXT;
+  FF_MM_SSE3        = AV_CPU_FLAG_SSE3;
+  FF_MM_SSE3SLOW    = AV_CPU_FLAG_SSE3SLOW;
+  FF_MM_SSSE3       = AV_CPU_FLAG_SSSE3;
+  FF_MM_SSE4        = AV_CPU_FLAG_SSE4;
+  FF_MM_SSE42       = AV_CPU_FLAG_SSE42;
+  FF_MM_IWMMXT      = AV_CPU_FLAG_IWMMXT;
+  FF_MM_ALTIVEC     = AV_CPU_FLAG_ALTIVEC;
+{$ENDIF}
+
+  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_BUFFERS      = $00008000;
+
+  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_DCT264 = 14;
+  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_CODER_TYPE_VLC       = 0;
+  FF_CODER_TYPE_AC        = 1;
+  FF_CODER_TYPE_RAW       = 2;
+  FF_CODER_TYPE_RLE       = 3;
+  FF_CODER_TYPE_DEFLATE   = 4;
+
+  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    = $0004; ///< allow draw_horiz_band() with 1 component at a time (SVQ1)
+
+  FF_MB_DECISION_SIMPLE = 0;        ///< uses mb_cmp
+  FF_MB_DECISION_BITS   = 1;        ///< chooses the one which needs the fewest bits
+  FF_MB_DECISION_RD     = 2;        ///< rate distortion
+
+{$IFDEF FF_API_ANTIALIAS_ALGO}
+  FF_AA_AUTO    = 0;
+  FF_AA_FASTINT = 1; //not implemented yet
+  FF_AA_INT     = 2;
+  FF_AA_FLOAT   = 3;
+{$ENDIF}
+
+  FF_PROFILE_UNKNOWN  = -99;
+  FF_PROFILE_RESERVED = -100;
+
+  FF_PROFILE_AAC_MAIN = 0;
+  FF_PROFILE_AAC_LOW  = 1;
+  FF_PROFILE_AAC_SSR  = 2;
+  FF_PROFILE_AAC_LTP  = 3;
+
+  FF_PROFILE_DTS         = 20;
+  FF_PROFILE_DTS_ES      = 30;
+  FF_PROFILE_DTS_96_24   = 40;
+  FF_PROFILE_DTS_HD_HRA  = 50;
+  FF_PROFILE_DTS_HD_MA   = 60;
+  FF_PROFILE_MPEG2_422   =  0;
+  FF_PROFILE_MPEG2_HIGH  =  1;
+  FF_PROFILE_MPEG2_SS    =  2;
+  FF_PROFILE_MPEG2_SNR_SCALABLE = 3;
+  FF_PROFILE_MPEG2_MAIN  =  4;
+  FF_PROFILE_MPEG2_SIMPLE=  5;
+  FF_PROFILE_H264_CONSTRAINED  = (1<<9);  // 8+1; constraint_set1_flag
+  FF_PROFILE_H264_INTRA        = (1<<11); // 8+3; constraint_set3_flag
+  FF_PROFILE_H264_BASELINE             = 66;
+  FF_PROFILE_H264_CONSTRAINED_BASELINE = (66 or FF_PROFILE_H264_CONSTRAINED);
+  FF_PROFILE_H264_MAIN                 = 77;
+  FF_PROFILE_H264_EXTENDED             = 88;
+  FF_PROFILE_H264_HIGH                 = 100;
+  FF_PROFILE_H264_HIGH_10              = 110;
+  FF_PROFILE_H264_HIGH_10_INTRA        = (110 or FF_PROFILE_H264_INTRA);
+  FF_PROFILE_H264_HIGH_422             = 122;
+  FF_PROFILE_H264_HIGH_422_INTRA       = (122 or FF_PROFILE_H264_INTRA);
+  FF_PROFILE_H264_HIGH_444             = 144;
+  FF_PROFILE_H264_HIGH_444_PREDICTIVE  = 244;
+  FF_PROFILE_H264_HIGH_444_INTRA       = (244 or FF_PROFILE_H264_INTRA);
+  FF_PROFILE_H264_CAVLC_444            = 44;
+  FF_PROFILE_VC1_SIMPLE   = 0;
+  FF_PROFILE_VC1_MAIN     = 1;
+  FF_PROFILE_VC1_COMPLEX  = 2;
+  FF_PROFILE_VC1_ADVANCED = 3;
+
+  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 *)
+
+  FF_COMPRESSION_DEFAULT = -1;
+
+  FF_THREAD_FRAME   = 1; //< Decode more than one frame at once
+  FF_THREAD_SLICE   = 2; //< Decode more than one part of a single frame at once
+
+  AVPALETTE_SIZE = 1024;
+  AVPALETTE_COUNT = 256;
+
+type
+  PAVPacket = ^TAVPacket;
+  TAVPacket = record
+(*
+ * Presentation timestamp in AVStream->time_base units; the time at which
+ * the decompressed packet will be presented to the user.
+ * Can be AV_NOPTS_VALUE if it is not stored in the file.
+ * pts MUST be larger or equal to dts as presentation cannot happen before
+ * decompression, unless one wants to view hex dumps. Some formats misuse
+ * the terms dts and pts/cts to mean something different. Such timestamps
+ * must be converted to true pts/dts before they are stored in AVPacket.
+ *)
+    pts:          cint64;
+(*
+ * Decompression timestamp in AVStream->time_base units; the time at which
+ * the packet is decompressed.
+ * Can be AV_NOPTS_VALUE if it is not stored in the file.
+ *)
+    dts:          cint64;
+    data:         PByteArray;
+    size:         cint;
+    stream_index: cint;
+    flags:        cint;
+(*
+ * Duration of this packet in AVStream->time_base units, 0 if unknown.
+ * Equals next_pts - this_pts in presentation order.
+ *)
+    duration:     cint;
+    destruct:     procedure (para1: PAVPacket); cdecl;
+    priv:         pointer;
+    pos:          cint64;       // byte position in stream, -1 if unknown
+
+(*
+ * Time difference in AVStream->time_base units from the pts of this
+ * packet to the point at which the output from the decoder has converged
+ * independent from the availability of previous frames. That is, the
+ * frames are virtually identical no matter if decoding started from
+ * the very first frame or from this keyframe.
+ * Is AV_NOPTS_VALUE if unknown.
+ * This field has no meaning if the packet does not have AV_PKT_FLAG_KEY
+ * set.
+ *
+ * The purpose of this field is to allow seeking in streams that have no
+ * keyframes in the conventional sense. It corresponds to the
+ * recovery point SEI in H.264 and match_time_delta in NUT. It is also
+ * essential for some types of subtitle streams to ensure that all
+ * subtitles are correctly displayed after seeking.
+ *)
+    convergence_duration: cint64;
+  end; {TAVPacket}
+
+const
+  AV_PKT_FLAG_KEY = $0001;
+{$IF LIBAVCODEC_VERSION_MAJOR < 53}
+  PKT_FLAG_KEY = AV_PKT_FLAG_KEY;
+{$IFEND}
+    
+type
+  (**
+   * 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*.
+   *)
+  PAVFrame = ^TAVFrame;
+  TAVFrame = record
+    (**
+     * pointer to the picture planes.
+     * This might be different from the first allocated byte
+     * - encoding:
+     * - decoding:
+     *)
+    data: array [0..3] of pbyte;
+    linesize: array [0..3] of cint;
+    (**
+     * 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:
+     *)
+    base: array [0..3] of pbyte;
+    (**
+     * 1 -> keyframe, 0-> not
+     * - encoding: Set by libavcodec.
+     * - decoding: Set by libavcodec.
+     *)
+    key_frame: cint;
+    (**
+     * 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.
+     *)
+    pict_type: TAVPictureType;
+    (**
+     * 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.
+     *)
+    pts: cint64;
+    (**
+     * picture number in bitstream order
+     * - encoding: set by
+     * - decoding: Set by libavcodec.
+     *)
+    coded_picture_number: cint;
+    (**
+     * picture number in display order
+     * - encoding: set by
+     * - decoding: Set by libavcodec.
+     *)
+    display_picture_number: cint;
+
+    (**
+     * 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.
+     *)
+    quality: cint;
+
+    (**
+     * 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().
+     *)
+    age: cint;
+
+    (**
+     * 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)).
+     *)
+    reference: cint;
+
+    (**
+     * QP table
+     * - encoding: unused
+     * - decoding: Set by libavcodec.
+     *)
+    qscale_table: PShortint;
+
+    (**
+     * QP store stride
+     * - encoding: unused
+     * - decoding: Set by libavcodec.
+     *)
+    qstride: cint;
+
+    (**
+     * mbskip_table[mb]>=1 if MB didn't change
+     * stride= mb_width = (width+15)>>4
+     * - encoding: unused
+     * - decoding: Set by libavcodec.
+     *)
+    mbskip_table: pbyte;
+
+    (**
+     * 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];
+    motion_val: array [0..1] of pointer;
+
+    (**
+     * macroblock type table
+     * mb_type_base + mb_width + 2
+     * - encoding: Set by user.
+     * - decoding: Set by libavcodec.
+     *)
+    mb_type: PCuint;
+
+    (**
+     * 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.
+     *)
+    motion_subsample_log2: byte;
+
+    (**
+     * for some private data of the user
+     * - encoding: unused
+     * - decoding: Set by user.
+     *)
+    opaque: pointer;
+
+    (**
+     * error
+     * - encoding: Set by libavcodec. if flags&CODEC_FLAG_PSNR.
+     * - decoding: unused
+     *)
+    error: array [0..3] of cuint64;
+
+    (**
+     * 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.
+     *)
+    type_: cint;
+
+    (**
+     * When decoding, this signals how much the picture must be delayed.
+     * extra_delay = repeat_pict / (2*fps)
+     * - encoding: unused
+     * - decoding: Set by libavcodec.
+     *)
+    repeat_pict: cint;
+
+    (**
+     *
+     *)
+    qscale_type: cint;
+
+    (**
+     * The content of the picture is interlaced.
+     * - encoding: Set by user.
+     * - decoding: Set by libavcodec. (default 0)
+     *)
+    interlaced_frame: cint;
+
+    (**
+     * If the content is interlaced, is top field displayed first.
+     * - encoding: Set by user.
+     * - decoding: Set by libavcodec.
+     *)
+    top_field_first: cint;
+
+    (**
+     * Pan scan.
+     * - encoding: Set by user.
+     * - decoding: Set by libavcodec.
+     *)
+    pan_scan: PAVPanScan;
+
+    (**
+     * Tell user application that palette has changed from previous frame.
+     * - encoding: ??? (no palette-enabled encoder yet)
+     * - decoding: Set by libavcodec. (default 0).
+     *)
+    palette_has_changed: cint;
+
+    (**
+     * codec suggestion on buffer type if != 0
+     * - encoding: unused
+     * - decoding: Set by libavcodec. (before get_buffer() call)).
+     *)
+    buffer_hints: cint;
+
+    (**
+     * DCT coefficients
+     * - encoding: unused
+     * - decoding: Set by libavcodec.
+     *)
+    dct_coeff: PsmallInt;
+
+    (**
+     * motion reference frame index
+     * the order in which these are stored can depend on the codec.
+     * - encoding: Set by user.
+     * - decoding: Set by libavcodec.
+     *)
+    ref_index: array [0..1] of PShortint;
+
+    (**
+     * reordered opaque 64bit number (generally a PTS) from AVCodecContext.reordered_opaque
+     * PTS but can be anything). 
+     * The user sets AVCodecContext.reordered_opaque to represent the input at
+     * that time,
+     * the decoder reorders values as needed and sets AVFrame.reordered_opaque
+     * to exactly one of the values provided by the user through AVCodecContext.reordered_opaque 
+     * @deprecated in favor of pkt_pts
+     * - encoding: unused
+     * - decoding: Read by user.
+     *)
+    reordered_opaque: cint64;
+    
+    (**
+     * hardware accelerator private data (FFmpeg allocated)
+     * - encoding: unused
+     * - decoding: Set by libavcodec
+     *)
+    hwaccel_picture_private: pointer;
+
+    (**
+     * reordered pts from the last AVPacket that has been input into the decoder
+     * - encoding: unused
+     * - decoding: Read by user.
+     *)
+     pkt_pts: cint64;
+
+    (**
+     * dts from the last AVPacket that has been input into the decoder
+     * - encoding: unused
+     * - decoding: Read by user.
+     *)
+     pkt_dts: cint64;
+
+    (**
+     * the AVCodecContext which ff_thread_get_buffer() was last called on
+     * - encoding: Set by libavcodec.
+     * - decoding: Set by libavcodec.
+     *)
+     owner: PAVCodecContext;
+
+    (**
+     * used by multithreading to store frame-specific info
+     * - encoding: Set by libavcodec.
+     * - decoding: Set by libavcodec.
+     *)
+     thread_opaque: pointer;
+
+    (**
+     * frame timestamp estimated using various heuristics, in stream time base
+     * - encoding: unused
+     * - decoding: set by libavcodec, read by user.
+     *)
+     best_effort_timestamp: cint64;
+
+    (**
+     * reordered pos from the last AVPacket that has been input into the decoder
+     * - encoding: unused
+     * - decoding: Read by user.
+     *)
+     pkt_pos: cint64;
+
+    (**
+     * reordered sample aspect ratio for the video frame, 0/1 if unknown\unspecified
+     * - encoding: unused
+     * - decoding: Read by user.
+     *)
+     sample_aspect_ratio: AVRational;
+
+    (**
+     * width and height of the video frame
+     * - encoding: unused
+     * - decoding: Read by user.
+     *)
+     width, height: cint;
+
+    (**
+     * format of the frame, -1 if unknown or unset
+     * It should be cast to the corresponding enum (enum PixelFormat
+     * for video, enum AVSampleFormat for audio)
+     * - encoding: unused
+     * - decoding: Read by user.
+     *)
+     format: cint;
+  end; {TAVFrame}
+
+  PAVClass = ^TAVClass;
+
+  PAVCodec = ^TAVCodec;
+
+  PAVHWAccel = ^TAVHWAccel;
+
+  // int[4]
+  PQuadIntArray = ^TQuadIntArray;
+  TQuadIntArray = array [0..3] of cint;
+  // int (*func)(struct AVCodecContext *c2, void *arg)
+  TExecuteFunc = function(c2: PAVCodecContext; arg: Pointer): cint; cdecl;
+  // int (*func)(struct AVCodecContext *c2, void *arg, int jobnr, int threadnr)
+  TExecute2Func = function(c2: PAVCodecContext; arg: Pointer; jobnr: cint; threadnr: cint): cint; cdecl;
+  
+  (**
+   * 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*.
+   *)
+  PAVCodecContext = ^TAVCodecContext;
+  TAVCodecContext = record {720}
+    (**
+     * information 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 libavcodec. 0 or some bitrate if this info is available in the stream.
+     *)
+    bit_rate: cint;
+
+    (**
+     * 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: cint;
+
+    (**
+     * CODEC_FLAG_*.
+     * - encoding: Set by user.
+     * - decoding: Set by user.
+     *)
+    flags: cint;
+
+    (**
+     * 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?)
+     *)
+    sub_id: cint;
+
+    (**
+     * 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
+     *)
+    me_method: cint;
+
+    (**
+     * 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.
+     *)
+    extradata: pbyte;
+    extradata_size: cint;
+
+    (**
+     * 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.
+     *)
+    time_base: TAVRational;
+
+    (* 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.
+     *)
+    width, height: cint;
+
+    (**
+     * the number of pictures in a group of pictures, or 0 for intra_only
+     * - encoding: Set by user.
+     * - decoding: unused
+     *)
+    gop_size: cint;
+
+    (**
+     * Pixel format, see PIX_FMT_xxx.
+     * May be set by the demuxer if known from headers.
+     * May be overriden by the decoder if it knows better.
+     * - encoding: Set by user.
+     * - decoding: Set by user if known, overridden by libavcodec if known
+     *)
+    pix_fmt: TAVPixelFormat;
+
+{$IFDEF FF_API_RATE_EMU}
+    (**
+     * 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
+     *)
+    rate_emu: cint;
+{$ENDIF}
+
+    (**
+     * If non NULL, 'draw_horiz_band' is called by the libavcodec
+     * decoder to draw a horizontal band. It improves cache usage. Not
+     * all codecs can do that. You must check the codec capabilities
+     * beforehand.
+     * The function is also used by hardware acceleration APIs.
+     * It is called at least once during frame decoding to pass
+     * the data needed for hardware render.
+     * In that mode instead of pixel data, AVFrame points to
+     * a structure specific to the acceleration API. The application
+     * reads the structure and can change some fields to indicate progress
+     * or mark state.
+     * - encoding: unused
+     * - decoding: Set by user.
+     * @param height the height of the slice
+     * @param y the y position of the slice
+     * @param type 1->top field, 2->bottom field, 3->frame
+     * @param offset offset into the AVFrame.data from which the slice should be read
+     *)
+    draw_horiz_band: procedure (s: PAVCodecContext;
+                                src: {const} PAVFrame; offset: PQuadIntArray;
+                                y: cint; type_: cint; height: cint); cdecl;
+
+    (* audio only *)
+    sample_rate: cint; ///< samples per second
+    channels: cint;    ///< number of audio channels
+    
+    (**
+     * audio sample format
+     * - encoding: Set by user.
+     * - decoding: Set by libavcodec.
+     *)
+    sample_fmt: TAVSampleFormat;  ///< sample format
+
+    (* The following data should not be initialized. *)
+    (**
+     * Samples per packet, initialized when calling 'init'.
+     *)
+    frame_size: cint;
+    frame_number: cint;   ///< audio or video frame number
+{$IF LIBAVCODEC_MAX_VERSION_MAJOR < 53}
+    real_pict_num: cint;  ///< returns the real picture number of previous encoded frame
+{$IFEND}
+
+    (**
+     * Number of frames the decoded output will be delayed relative to
+     * the encoded input.
+     * - encoding: Set by libavcodec.
+     * - decoding: unused
+     *)
+    delay: cint;
+
+    (* - encoding parameters *)
+    qcompress: cfloat;  ///< amount of qscale change between easy & hard scenes (0.0-1.0)
+    qblur: cfloat;      ///< amount of qscale smoothing over time (0.0-1.0)
+
+    (**
+     * minimum quantizer
+     * - encoding: Set by user.
+     * - decoding: unused
+     *)
+    qmin: cint;
+
+   (**
+     * maximum quantizer
+     * - encoding: Set by user.
+     * - decoding: unused
+     *)
+   qmax: cint;
+
+    (**
+     * maximum quantizer difference between frames
+     * - encoding: Set by user.
+     * - decoding: unused
+     *)
+    max_qdiff: cint;
+
+    (**
+     * maximum number of B-frames between non-B-frames
+     * Note: The output will be delayed by max_b_frames+1 relative to the input.
+     * - encoding: Set by user.
+     * - decoding: unused
+     *)
+    max_b_frames: cint;
+
+    (**
+     * qscale factor between IP and B-frames
+     * If > 0 then the last P-frame quantizer will be used (q= lastp_q*factor+offset).
+     * If < 0 then normal ratecontrol will be done (q= -normal_q*factor+offset).
+     * - encoding: Set by user.
+     * - decoding: unused
+     *)
+    b_quant_factor: cfloat;
+
+    (** obsolete FIXME remove *)
+    rc_strategy: cint;
+
+    b_frame_strategy: cint;
+
+{$IFDEF FF_API_HURRY_UP}
+    (**
+     * 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.
+     *)
+    hurry_up: cint;
+{$ENDIF}
+
+    codec: PAVCodec;
+
+    priv_data: pointer;
+
+    rtp_payload_size: cint;     (* 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: cint; mb_nb: cint); cdecl;
+
+    (* statistics, used for 2-pass encoding *)
+    mv_bits: cint;
+    header_bits: cint;
+    i_tex_bits: cint;
+    p_tex_bits: cint;
+    i_count: cint;
+    p_count: cint;
+    skip_count: cint;
+    misc_bits: cint;
+
+    (**
+     * number of bits used for the previously encoded frame
+     * - encoding: Set by libavcodec.
+     * - decoding: unused
+     *)
+    frame_bits: cint;
+
+    (**
+     * 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 AnsiChar;
+    codec_type: TAVMediaType; (* see AVMEDIA_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 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.
+     *)
+    codec_tag: cuint;
+
+    (**
+     * Work around bugs in encoders which sometimes cannot be detected automatically.
+     * - encoding: Set by user
+     * - decoding: Set by user
+     *)
+    workaround_bugs: cint;
+
+    (**
+     * luma single coefficient elimination threshold
+     * - encoding: Set by user.
+     * - decoding: unused
+     *)
+    luma_elim_threshold: cint;
+
+    (**
+     * chroma single coeff elimination threshold
+     * - encoding: Set by user.
+     * - decoding: unused
+     *)
+    chroma_elim_threshold: cint;
+
+    (**
+     * strictly follow the standard (MPEG4, ...).
+     * - encoding: Set by user.
+     * - decoding: Set by user.
+     * Setting this to STRICT or higher means the encoder and decoder will
+     * generally do stupid things, whereas setting it to unofficial or lower
+     * will mean the encoder might produce output that is not supported by all
+     * spec-compliant decoders. Decoders don't differentiate between normal,
+     * unofficial and experimental (that is, they always try to decode things
+     * when they can) unless they are explicitly asked to behave stupidly
+     * (=strictly conform to the specs)
+     *)
+    strict_std_compliance: cint;
+
+    (**
+     * qscale offset between IP and B-frames
+     * - encoding: Set by user.
+     * - decoding: unused
+     *)
+    b_quant_offset: cfloat;
+
+    (**
+     * 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.
+     *)
+    error_recognition: cint;
+
+    (**
+     * 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_dimensions2() should be used to find the required width and
+     * height, as they normally need to be rounded up to the next multiple of 16.
+     * if CODEC_CAP_DR1 is not set then get_buffer() must call
+     * avcodec_default_get_buffer() instead of providing buffers allocated by
+     * some other means.
+     * - encoding: unused
+     * - decoding: Set by libavcodec, user can override.
+     *)
+    get_buffer: function (c: PAVCodecContext; pic: PAVFrame): cint; cdecl;
+
+    (**
+     * 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.
+     *)
+    release_buffer: procedure (c: PAVCodecContext; pic: PAVFrame); cdecl;
+
+    (**
+     * 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.
+     *)
+    has_b_frames: cint;
+
+    (**
+     * number of bytes per packet if constant and known or 0
+     * Used by some WAV based audio codecs.
+     *)
+    block_align: cint;
+
+    parse_only: cint; (* - 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: cint;
+
+    (**
+     * pass1 encoding statistics output buffer
+     * - encoding: Set by libavcodec.
+     * - decoding: unused
+     *)
+    stats_out: PAnsiChar;
+
+    (**
+     * 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: PAnsiChar;
+
+    (**
+     * 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: cfloat;
+
+    rc_qmod_amp: cfloat;
+    rc_qmod_freq: cint;
+
+    (**
+     * ratecontrol override, see RcOverride
+     * - encoding: Allocated/set/freed by user.
+     * - decoding: unused
+     *)
+    rc_override: PRcOverride;
+    rc_override_count: cint;
+
+    (**
+     * rate control equation
+     * - encoding: Set by user
+     * - decoding: unused
+     *)
+    rc_eq: {const} PAnsiChar; 
+
+    (**
+     * maximum bitrate
+     * - encoding: Set by user.
+     * - decoding: unused
+     *)
+    rc_max_rate: cint;
+
+    (**
+     * minimum bitrate
+     * - encoding: Set by user.
+     * - decoding: unused
+     *)
+    rc_min_rate: cint;
+
+    (**
+     * decoder bitstream buffer size
+     * - encoding: Set by user.
+     * - decoding: unused
+     *)
+    rc_buffer_size: cint;
+    rc_buffer_aggressivity: cfloat;
+
+    (**
+     * 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: cfloat;
+
+    (**
+     * qscale offset between P and I-frames
+     * - encoding: Set by user.
+     * - decoding: unused
+     *)
+    i_quant_offset: cfloat;
+
+    (**
+     * initial complexity for pass1 ratecontrol
+     * - encoding: Set by user.
+     * - decoding: unused
+     *)
+    rc_initial_cplx: cfloat;
+
+    (**
+     * DCT algorithm, see FF_DCT_* below
+     * - encoding: Set by user.
+     * - decoding: unused
+     *)
+    dct_algo: cint;
+
+    (**
+     * luminance masking (0-> disabled)
+     * - encoding: Set by user.
+     * - decoding: unused
+     *)
+    lumi_masking: cfloat;
+
+    (**
+     * temporary complexity masking (0-> disabled)
+     * - encoding: Set by user.
+     * - decoding: unused
+     *)
+    temporal_cplx_masking: cfloat;
+
+    (**
+     * spatial complexity masking (0-> disabled)
+     * - encoding: Set by user.
+     * - decoding: unused
+     *)
+    spatial_cplx_masking: cfloat;
+
+    (**
+     * p block masking (0-> disabled)
+     * - encoding: Set by user.
+     * - decoding: unused
+     *)
+    p_masking: cfloat;
+
+    (**
+     * darkness masking (0-> disabled)
+     * - encoding: Set by user.
+     * - decoding: unused
+     *)
+    dark_masking: cfloat;
+
+    (**
+     * IDCT algorithm, see FF_IDCT_* below.
+     * - encoding: Set by user.
+     * - decoding: Set by user.
+     *)
+    idct_algo: cint;
+
+    (**
+     * slice count
+     * - encoding: Set by libavcodec.
+     * - decoding: Set by user (or 0).
+     *)
+    slice_count: cint;
+
+    (**
+     * slice offsets in the frame in bytes
+     * - encoding: Set/allocated by libavcodec.
+     * - decoding: Set/allocated by user (or NULL).
+     *)
+    slice_offset: PCint;
+
+    (**
+     * error concealment flags
+     * - encoding: unused
+     * - decoding: Set by user.
+     *)
+    error_concealment: cint;
+
+    (**
+     * 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.)
+     *)
+    dsp_mask: cuint;
+
+    (**
+     * bits per sample/pixel from the demuxer (needed for huffyuv).
+     * - encoding: Set by libavcodec.
+     * - decoding: Set by user.
+     *)
+     bits_per_coded_sample: cint;
+
+    (**
+     * prediction method (needed for huffyuv)
+     * - encoding: Set by user.
+     * - decoding: unused
+     *)
+     prediction_method: cint;
+
+    (**
+     * 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.
+     *)
+    sample_aspect_ratio: TAVRational;
+
+    (**
+     * the picture in the bitstream
+     * - encoding: Set by libavcodec.
+     * - decoding: Set by libavcodec.
+     *)
+    coded_frame: PAVFrame;
+
+    (**
+     * debug
+     * - encoding: Set by user.
+     * - decoding: Set by user.
+     *)
+    debug: cint;
+
+    (**
+     * debug
+     * - encoding: Set by user.
+     * - decoding: Set by user.
+     *)
+    debug_mv: cint;
+
+    (**
+     * error
+     * - encoding: Set by libavcodec if flags&CODEC_FLAG_PSNR.
+     * - decoding: unused
+     *)
+    error: array [0..3] of cuint64;
+
+{$IFDEF FF_API_MB_Q}
+    (**
+     * minimum MB quantizer
+     * - encoding: unused
+     * - decoding: unused
+     *)
+    mb_qmin: cint; {deprecated}
+
+    (**
+     * maximum MB quantizer
+     * - encoding: unused
+     * - decoding: unused
+     *)
+    mb_qmax: cint; {deprecated}
+{$ENDIF}
+
+    (**
+     * motion estimation comparison function
+     * - encoding: Set by user.
+     * - decoding: unused
+     *)
+    me_cmp: cint;
+
+    (**
+     * subpixel motion estimation comparison function
+     * - encoding: Set by user.
+     * - decoding: unused
+     *)
+    me_sub_cmp: cint;
+    (**
+     * macroblock comparison function (not supported yet)
+     * - encoding: Set by user.
+     * - decoding: unused
+     *)
+    mb_cmp: cint;
+    (**
+     * interlaced DCT comparison function
+     * - encoding: Set by user.
+     * - decoding: unused
+     *)
+    ildct_cmp: cint;
+
+    (**
+     * ME diamond size & shape
+     * - encoding: Set by user.
+     * - decoding: unused
+     *)
+    dia_size: cint;
+
+    (**
+     * amount of previous MV predictors (2a+1 x 2a+1 square)
+     * - encoding: Set by user.
+     * - decoding: unused
+     *)
+    last_predictor_count: cint;
+
+    (**
+     * prepass for motion estimation
+     * - encoding: Set by user.
+     * - decoding: unused
+     *)
+    pre_me: cint;
+
+    (**
+     * motion estimation prepass comparison function
+     * - encoding: Set by user.
+     * - decoding: unused
+     *)
+    me_pre_cmp: cint;
+
+    (**
+     * ME prepass diamond size & shape
+     * - encoding: Set by user.
+     * - decoding: unused
+     *)
+    pre_dia_size: cint;
+
+    (**
+     * subpel ME quality
+     * - encoding: Set by user.
+     * - decoding: unused
+     *)
+    me_subpel_quality: cint;
+
+    (**
+     * 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.
+     *)
+    get_format: function (s: PAVCodecContext; fmt: {const} PAVPixelFormat): TAVPixelFormat; cdecl;
+
+    (**
+     * 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.
+     *)
+    dtg_active_format: cint;
+
+    (**
+     * maximum motion estimation search range in subpel units
+     * If 0 then no limit.
+     *
+     * - encoding: Set by user.
+     * - decoding: unused
+     *)
+    me_range: cint;
+
+    (**
+     * intra quantizer bias
+     * - encoding: Set by user.
+     * - decoding: unused
+     *)
+    intra_quant_bias: cint;
+
+    (**
+     * inter quantizer bias
+     * - encoding: Set by user.
+     * - decoding: unused
+     *)
+    inter_quant_bias: cint;
+
+    (**
+     * color table ID
+     * - encoding: unused
+     * - decoding: Which clrtable should be used for 8bit RGB images.
+     *             Tables have to be stored somewhere. FIXME
+     *)
+    color_table_id: cint;
+
+    (**
+     * internal_buffer count
+     * Don't touch, used by libavcodec default_get_buffer().
+     *)
+    internal_buffer_count: cint;
+
+    (**
+     * internal_buffers
+     * Don't touch, used by libavcodec default_get_buffer().
+     *)
+    internal_buffer: pointer;
+
+    (**
+     * 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
+     *)
+    global_quality: cint;
+
+    (**
+     * coder type
+     * - encoding: Set by user.
+     * - decoding: unused
+     *)
+    coder_type: cint;
+
+    (**
+     * context model
+     * - encoding: Set by user.
+     * - decoding: unused
+     *)
+    context_model: cint;
+
+    {
+    (**
+     *
+     * - encoding: unused
+     * - decoding: Set by user.
+     *)
+    realloc: function (s: PAVCodecContext; buf: Pbyte; buf_size: cint): Pbyte; cdecl;
+    }
+
+    (**
+     * slice flags
+     * - encoding: unused
+     * - decoding: Set by user.
+     *)
+    slice_flags: cint;
+
+    (**
+     * XVideo Motion Acceleration
+     * - encoding: forbidden
+     * - decoding: set by decoder
+     *)
+    xvmc_acceleration: cint;
+
+    (**
+     * macroblock decision mode
+     * - encoding: Set by user.
+     * - decoding: unused
+     *)
+    mb_decision: cint;
+
+    (**
+     * custom intra quantization matrix
+     * - encoding: Set by user, can be NULL.
+     * - decoding: Set by libavcodec.
+     *)
+    intra_matrix: PWord;
+
+    (**
+     * custom inter quantization matrix
+     * - encoding: Set by user, can be NULL.
+     * - decoding: Set by libavcodec.
+     *)
+    inter_matrix: PWord;
+
+    (**
+     * 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.
+     *)
+    stream_codec_tag: array [0..3] of AnsiChar; //cuint;
+
+    (**
+     * scene change detection threshold
+     * 0 is default, larger means fewer detected scene changes.
+     * - encoding: Set by user.
+     * - decoding: unused
+     *)
+    scenechange_threshold: cint;
+
+    (**
+     * minimum Lagrange multipler
+     * - encoding: Set by user.
+     * - decoding: unused
+     *)
+    lmin: cint;
+
+    (**
+     * maximum Lagrange multipler
+     * - encoding: Set by user.
+     * - decoding: unused
+     *)
+    lmax: cint;
+
+{$IFDEF FF_API_PALETTE_CONTROL}
+    (**
+     * palette control structure
+     * - encoding: ??? (no palette-enabled encoder yet)
+     * - decoding: Set by user.
+     *)
+    palctrl: PAVPaletteControl;
+{$ENDIF}
+
+    (**
+     * noise reduction strength
+     * - encoding: Set by user.
+     * - decoding: unused
+     *)
+    noise_reduction: cint;
+
+    (**
+     * Called at the beginning of a frame to get cr buffer for it.
+     * Buffer type (size, hints) must be the same. libavcodec won't check it.
+     * libavcodec will pass previous buffer in pic, function should return
+     * same buffer or new buffer with old frame "painted" into it.
+     * If pic.data[0] == NULL must behave like get_buffer().
+     * if CODEC_CAP_DR1 is not set then reget_buffer() must call
+     * avcodec_default_reget_buffer() instead of providing buffers allocated by
+     * some other means.
+     * - encoding: unused
+     * - decoding: Set by libavcodec, user can override
+     *)
+    reget_buffer: function (c: PAVCodecContext; pic: PAVFrame): cint; cdecl;
+
+    (**
+     * Number of bits which should be loaded into the rc buffer before decoding starts.
+     * - encoding: Set by user.
+     * - decoding: unused
+     *)
+    rc_initial_buffer_occupancy: cint;
+
+    (**
+     *
+     * - encoding: Set by user.
+     * - decoding: unused
+     *)
+    inter_threshold: cint;
+
+    (**
+     * CODEC_FLAG2_*
+     * - encoding: Set by user.
+     * - decoding: Set by user.
+     *)
+    flags2: cint;
+
+    (**
+     * Simulates errors in the bitstream to test error concealment.
+     * - encoding: Set by user.
+     * - decoding: unused
+     *)
+    error_rate: cint;
+
+{$IFDEF FF_API_ANTIALIAS_ALGO}
+    (**
+     * MP3 antialias algorithm, see FF_AA_* below.
+     * - encoding: unused
+     * - decoding: Set by user.
+     *)
+    antialias_algo: cint; {deprecated}
+{$ENDIF}
+
+    (**
+     * quantizer noise shaping
+     * - encoding: Set by user.
+     * - decoding: unused
+     *)
+    quantizer_noise_shaping: cint;
+
+    (**
+     * thread count
+     * is used to decide how many independent tasks should be passed to execute()
+     * - encoding: Set by user.
+     * - decoding: Set by user.
+     *)
+    thread_count: cint;
+
+    (**
+     * 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.
+     *)
+    execute: function (c: PAVCodecContext; func: TExecuteFunc; arg: Pointer; ret: PCint; count: cint; size: cint): cint; 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 below which no motion estimation is
+     * performed, but instead the user specified motion vectors are used.
+     *
+     * - encoding: Set by user.
+     * - decoding: unused
+     *)
+     me_threshold: cint;
+
+    (**
+     * Macroblock threshold below which the user specified macroblock types will be used.
+     * - encoding: Set by user.
+     * - decoding: unused
+     *)
+     mb_threshold: cint;
+
+    (**
+     * precision of the intra DC coefficient - 8
+     * - encoding: Set by user.
+     * - decoding: unused
+     *)
+     intra_dc_precision: cint;
+
+    (**
+     * noise vs. sse weight for the nsse comparsion function
+     * - encoding: Set by user.
+     * - decoding: unused
+     *)
+     nsse_weight: cint;
+
+    (**
+     * Number of macroblock rows at the top which are skipped.
+     * - encoding: unused
+     * - decoding: Set by user.
+     *)
+     skip_top: cint;
+
+    (**
+     * Number of macroblock rows at the bottom which are skipped.
+     * - encoding: unused
+     * - decoding: Set by user.
+     *)
+     skip_bottom: cint;
+
+    (**
+     * profile
+     * - encoding: Set by user.
+     * - decoding: Set by libavcodec.
+     *)
+     profile: cint;
+
+    (**
+     * level
+     * - encoding: Set by user.
+     * - decoding: Set by libavcodec.
+     *)
+     level: cint;
+
+    (**
+     * low resolution decoding, 1-> 1/2 size, 2->1/4 size
+     * - encoding: unused
+     * - decoding: Set by user.
+     *)
+     lowres: cint;
+
+    (**
+     * 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.
+     *)
+    coded_width, coded_height: cint;
+
+    (**
+     * frame skip threshold
+     * - encoding: Set by user.
+     * - decoding: unused
+     *)
+    frame_skip_threshold: cint;
+
+    (**
+     * frame skip factor
+     * - encoding: Set by user.
+     * - decoding: unused
+     *)
+    frame_skip_factor: cint;
+
+    (**
+     * frame skip exponent
+     * - encoding: Set by user.
+     * - decoding: unused
+     *)
+    frame_skip_exp: cint;
+
+    (**
+     * frame skip comparison function
+     * - encoding: Set by user.
+     * - decoding: unused
+     *)
+    frame_skip_cmp: cint;
+
+    (**
+     * Border processing masking, raises the quantizer for mbs on the borders
+     * of the picture.
+     * - encoding: Set by user.
+     * - decoding: unused
+     *)
+    border_masking: cfloat;
+
+    (**
+     * minimum MB lagrange multipler
+     * - encoding: Set by user.
+     * - decoding: unused
+     *)
+    mb_lmin: cint;
+
+    (**
+     * maximum MB lagrange multipler
+     * - encoding: Set by user.
+     * - decoding: unused
+     *)
+    mb_lmax: cint;
+
+    (**
+     *
+     * - encoding: Set by user.
+     * - decoding: unused
+     *)
+    me_penalty_compensation: cint;
+
+    (**
+     *
+     * - 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: cint;
+
+    (**
+     *
+     * - encoding: Set by user.
+     * - decoding: unused
+     *)
+    brd_scale: cint;
+
+    (**
+     * constant rate factor - quality-based VBR - values ~correspond to qps
+     * - encoding: Set by user.
+     * - decoding: unused
+     *)
+    crf: cfloat;
+
+    (**
+     * constant quantization parameter rate control method
+     * - encoding: Set by user.
+     * - decoding: unused
+     *)
+    cqp: cint;
+
+    (**
+     * minimum GOP size
+     * - encoding: Set by user.
+     * - decoding: unused
+     *)
+    keyint_min: cint;
+
+    (**
+     * number of reference frames
+     * - encoding: Set by user.
+     * - decoding: Set by lavc.
+     *)
+    refs: cint;
+
+    (**
+     * chroma qp offset from luma
+     * - encoding: Set by user.
+     * - decoding: unused
+     *)
+    chromaoffset: cint;
+
+    (**
+     * Influences how often B-frames are used.
+     * - encoding: Set by user.
+     * - decoding: unused
+     *)
+    bframebias: cint;
+
+    (**
+     * trellis RD quantization
+     * - encoding: Set by user.
+     * - decoding: unused
+     *)
+    trellis: cint;
+
+    (**
+     * Reduce fluctuations in qp (before curve compression).
+     * - encoding: Set by user.
+     * - decoding: unused
+     *)
+    complexityblur: cfloat;
+
+    (**
+     * in-loop deblocking filter alphac0 parameter
+     * alpha is in the range -6...6
+     * - encoding: Set by user.
+     * - decoding: unused
+     *)
+    deblockalpha: cint;
+
+    (**
+     * in-loop deblocking filter beta parameter
+     * beta is in the range -6...6
+     * - encoding: Set by user.
+     * - decoding: unused
+     *)
+    deblockbeta: cint;
+
+    (**
+     * macroblock subpartition sizes to consider - p8x8, p4x4, b8x8, i8x8, i4x4
+     * - encoding: Set by user.
+     * - decoding: unused
+     *)
+    partitions: cint;
+
+    (**
+     * direct MV prediction mode - 0 (none), 1 (spatial), 2 (temporal), 3 (auto)
+     * - encoding: Set by user.
+     * - decoding: unused
+     *)
+    directpred: cint;
+
+    (**
+     * Audio cutoff bandwidth (0 means "automatic")
+     * - encoding: Set by user.
+     * - decoding: unused
+     *)
+    cutoff: cint;
+
+    (**
+     * Multiplied by qscale for each frame and added to scene_change_score.
+     * - encoding: Set by user.
+     * - decoding: unused
+     *)
+    scenechange_factor: cint;
+
+    (**
+     *
+     * Note: Value depends upon the compare function used for fullpel ME.
+     * - encoding: Set by user.
+     * - decoding: unused
+     *)
+    mv0_threshold: cint;
+
+    (**
+     * Adjusts sensitivity of b_frame_strategy 1.
+     * - encoding: Set by user.
+     * - decoding: unused
+     *)
+    b_sensitivity: cint;
+
+    (**
+     * - encoding: Set by user.
+     * - decoding: unused
+     *)
+    compression_level: cint;
+
+{$IFDEF FF_API_USE_LPC}
+    (**
+     * Sets whether to use LPC mode - used by FLAC encoder.
+     * - encoding: Set by user.
+     * - decoding: unused
+     * @deprecated Deprecated in favor of lpc_type and lpc_passes.
+     *)
+    use_lpc: cint;
+
+    (**
+     * LPC coefficient precision - used by FLAC encoder
+     * - encoding: Set by user.
+     * - decoding: unused
+     *)
+    lpc_coeff_precision: cint;
+{$IFEND}
+
+    (**
+     * - encoding: Set by user.
+     * - decoding: unused
+     *)
+    min_prediction_order: cint;
+
+    (**
+     * - encoding: Set by user.
+     * - decoding: unused
+     *)
+    max_prediction_order: cint;
+
+{$IFDEF FF_API_FLAC_GLOBAL_OPTS}
+    (**
+     * search method for selecting prediction order
+     * - encoding: Set by user.
+     * - decoding: unused
+     *)
+    prediction_order_method: cint; {deprecated}
+
+    (**
+     * - encoding: Set by user.
+     * - decoding: unused
+     *)
+    min_partition_order: cint; {deprecated}
+
+    (**
+     * - encoding: Set by user.
+     * - decoding: unused
+     *)
+    max_partition_order: cint; {deprecated}
+{$IFEND}
+
+    (**
+     * GOP timecode frame start number, in non drop frame format
+     * - encoding: Set by user.
+     * - decoding: unused
+     *)
+    timecode_frame_start: cint64;
+
+{$IFDEF FF_API_REQUEST_CHANNELS}
+    (**
+     * Decoder should decode to this many channels if it can (0 for default)
+     * - encoding: unused
+     * - decoding: Set by user.
+     * @deprecated Deprecated in favor of request_channel_layout.
+     *)
+    request_channels: cint;
+{$IFEND}
+
+    (**
+     * 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.
+     *)
+    drc_scale: cfloat;
+
+    (**
+     * opaque 64bit number (generally a PTS) that will be reordered and
+     * output in AVFrame.reordered_opaque
+     * - encoding: unused
+     * - decoding: Set by user.
+     *)
+    reordered_opaque: cint64;
+    
+    (**
+     * 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.
+     *)
+    bits_per_raw_sample: cint;
+
+    (**
+     * Audio channel layout.
+     * - encoding: set by user.
+     * - decoding: set by libavcodec.
+     *)
+    channel_layout: cint64;
+
+    (**
+     * Request decoder to use this channel layout if it can (0 for default)
+     * - encoding: unused
+     * - decoding: Set by user.
+     *)
+    request_channel_layout: cint64;
+
+    (**
+     * Ratecontrol attempt to use, at maximum, <value> of what can be used without an underflow.
+     * - encoding: Set by user.
+     * - decoding: unused.
+     *)
+    rc_max_available_vbv_use: cfloat;
+
+    (**
+     * Ratecontrol attempt to use, at least, <value> times the amount needed to prevent a vbv overflow.
+     * - encoding: Set by user.
+     * - decoding: unused.
+     *)
+    rc_min_vbv_overflow_use: cfloat;
+
+    (**
+     * Hardware accelerator in use
+     * - encoding: unused.
+     * - decoding: Set by libavcodec
+     *)
+    hwaccel: PAVHWAccel;
+
+    (**
+     * 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.
+     *)
+    ticks_per_frame: cint;
+
+    (**
+     * Hardware accelerator context.
+     * For some hardware accelerators, a global context needs to be
+     * provided by the user. In that case, this holds display-dependent
+     * data FFmpeg cannot instantiate itself. Please refer to the
+     * FFmpeg HW accelerator documentation to know how to fill this
+     * is. e.g. for VA API, this is a struct vaapi_context.
+     * - encoding: unused
+     * - decoding: Set by user
+     *)
+    hwaccel_context: pointer;
+
+    (**
+     * Chromaticity coordinates of the source primaries.
+     * - encoding: Set by user
+     * - decoding: Set by libavcodec
+     *)
+    color_primaries: TAVColorPrimaries;
+
+    (**
+     * Color Transfer Characteristic.
+     * - encoding: Set by user
+     * - decoding: Set by libavcodec
+     *)
+    color_trc: TAVColorTransferCharacteristic;
+
+    (**
+     * YUV colorspace type.
+     * - encoding: Set by user
+     * - decoding: Set by libavcodec
+     *)
+    colorspace: TAVColorSpace;
+
+    (**
+     * MPEG vs JPEG YUV range.
+     * - encoding: Set by user
+     * - decoding: Set by libavcodec
+     *)
+    color_range: TAVColorRange;
+
+    (**
+     * This defines the location of chroma samples.
+     * - encoding: Set by user
+     * - decoding: Set by libavcodec
+     *)
+     chroma_sample_location: TAVChromaLocation;
+
+    (**
+     * The codec may call this to execute several independent things.
+     * It will return only after finishing all tasks.
+     * The user may replace this with some multithreaded implementation,
+     * the default implementation will execute the parts serially.
+     * Also see avcodec_thread_init and e.g. the --enable-pthread configure option.
+     * @param c context passed also to func
+     * @param count the number of things to execute
+     * @param arg2 argument passed unchanged to func
+     * @param ret return values of executed functions, must have space for "count" values. May be NULL.
+     * @param func function that will be called count times, with jobnr from 0 to count-1.
+     *             threadnr will be in the range 0 to c->thread_count-1 < MAX_THREADS and so that no
+     *             two instances of func executing at the same time will have the same threadnr.
+     * @return always 0 currently, but code should handle a future improvement where when any call to func
+     *         returns < 0 no further calls to func may be done and < 0 is returned.
+     * - encoding: Set by libavcodec, user can override.
+     * - decoding: Set by libavcodec, user can override.
+     *)
+      execute2: function (c: PAVCodecContext; func: TExecute2Func; arg2: Pointer; ret: Pcint; count: cint): cint; cdecl;
+
+    (**
+     * 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
+     *)
+    weighted_p_pred: cint;
+
+    (**
+     * AQ mode
+     * 0: Disabled
+     * 1: Variance AQ (complexity mask)
+     * 2: Auto-variance AQ (experimental)
+     * - encoding: Set by user
+     * - decoding: unused
+     *)
+    aq_mode: cint;
+
+    (**
+     * AQ strength
+     * Reduces blocking and blurring in flat and textured areas.
+     * - encoding: Set by user
+     * - decoding: unused
+     *)
+    aq_strength: cfloat;
+
+    (**
+     * PSY RD
+     * Strength of psychovisual optimization
+     * - encoding: Set by user
+     * - decoding: unused
+     *)
+    psy_rd: cfloat;
+
+    (**
+     * PSY trellis
+     * Strength of psychovisual optimization
+     * - encoding: Set by user
+     * - decoding: unused
+     *)
+    psy_trellis: cfloat;
+
+    (**
+     * RC lookahead
+     * Number of frames for frametype and ratecontrol lookahead
+     * - encoding: Set by user
+     * - decoding: unused
+     *)
+    rc_lookahead: cint;
+
+    (**
+     * Constant rate factor maximum
+     * With CRF encoding mode and VBV restrictions enabled, prevents quality from being worse
+     * than crf_max, even if doing so would violate VBV restrictions.
+     * - encoding: Set by user.
+     * - decoding: unused
+     *)
+    crf_max: cfloat;
+
+    log_level_offset: cint;
+
+{$IFDEF FF_API_FLAC_GLOBAL_OPTS}
+    (**
+     * Determines which LPC analysis algorithm to use.
+     * - encoding: Set by user
+     * - decoding: unused
+     *)
+    lpc_type: TAVLPCType; {deprecated}
+
+    (**
+     * Number of passes to use for Cholesky factorization during LPC analysis
+     * - encoding: Set by user
+     * - decoding: unused
+     *)
+    lpc_passes: cint; {deprecated}
+{$ENDIF}
+
+    (**
+     * Number of slices.
+     * Indicates number of picture subdivisions. Used for parallelized
+     * decoding.
+     * - encoding: Set by user
+     * - decoding: unused
+     *)
+    slices: cint;
+
+    (**
+     * Header containing style information for text subtitles.
+     * For SUBTITLE_ASS subtitle type, it should contain the whole ASS
+     * [Script Info] and [V4+ Styles] section, plus the [Events] line and
+     * the Format line following. It shouldn't include any Dialogue line.
+     * - encoding: Set/allocated/freed by user (before avcodec_open())
+     * - decoding: Set/allocated/freed by libavcodec (by avcodec_open())
+     *)
+    subtitle_header: Pcuint8;
+    subtitle_header_size: cint;
+
+    (**
+     * Current packet as passed into the decoder, to avoid having
+     * to pass the packet into every function. Currently only valid
+     * inside lavc and get/release_buffer callbacks.
+     * - decoding: set by avcodec_decode_*, read by get_buffer() for setting pkt_pts
+     * - encoding: unused
+     *)
+    pkt: PAVPacket;
+
+    (**
+     * Whether this is a copy of the context which had init() called on it.
+     * This is used by multithreading - shared tables and picture pointers
+     * should be freed from the original context only.
+     * - encoding: Set by libavcodec.
+     * - decoding: Set by libavcodec.
+     *)
+    is_copy: cint;
+
+    (**
+     * Which multithreading methods to use.
+     * Use of FF_THREAD_FRAME will increase decoding delay by one frame per thread,
+     * so clients which cannot provide future frames should not use it.
+     *
+     * - encoding: Set by user, otherwise the default is used.
+     * - decoding: Set by user, otherwise the default is used.
+     *)
+    thread_type: cint;
+
+    (**
+     * Which multithreading methods are in use by the codec.
+     * - encoding: Set by libavcodec.
+     * - decoding: Set by libavcodec.
+     *)
+    active_thread_type: cint;
+
+    (**
+     * Set by the client if its custom get_buffer() callback can be called
+     * from another thread, which allows faster multithreaded decoding.
+     * draw_horiz_band() will be called from other threads regardless of this setting.
+     * Ignored if the default get_buffer() is used.
+     * - encoding: Set by user.
+     * - decoding: Set by user.
+     *)
+    thread_safe_callbacks: cint;
+
+    (**
+     * VBV delay coded in the last frame (in periods of a 27 MHz clock).
+     * Used for compliant TS muxing.
+     * - encoding: Set by libavcodec.
+     * - decoding: unused.
+     *)
+    vbv_delay: cuint64;
+
+    (**
+     * Type of service that the audio stream conveys.
+     * - encoding: Set by user.
+     * - decoding: Set by libavcodec.
+     *)
+    audio_service_type: TAVAudioServiceType;
+
+    (**
+     * desired sample format
+     * - encoding: Not used.
+     * - decoding: Set by user.
+     * Decoder will decode to this format if it can.
+     *)
+    request_sample_fmt: TAVSampleFormat;
+
+    (**
+     * Current statistics for PTS correction.
+     * - decoding: maintained and used by libavcodec, not intended to be used by user apps
+     * - encoding: unused
+     *)
+    pts_correction_num_faulty_pts: cint64; /// Number of incorrect PTS values so far
+    pts_correction_num_faulty_dts: cint64; /// Number of incorrect DTS values so far
+    pts_correction_last_pts: cint64;       /// PTS of the last frame
+    pts_correction_last_dts: cint64;       /// DTS of the last frame
+
+  end; {TAVCodecContext}
+
+  (**
+   * AVProfile.
+   *)
+  TAVProfile = record
+    profile: cint;
+    name: {const} PAnsiChar; ///< short name for the profile
+  end; {TAVProfile}
+
+(**
+ * AVCodec.
+ *)
+  TAVCodec = record
+    name: PAnsiChar;
+    type_: TAVMediaType;
+    id: TCodecID;
+    priv_data_size: cint;
+    init: function (avctx: PAVCodecContext): cint; cdecl;
+    encode: function (avctx: PAVCodecContext; buf: PByteArray; buf_size: cint; data: pointer): cint; cdecl;
+    close: function (avctx: PAVCodecContext): cint; cdecl;
+    decode: function (avctx: PAVCodecContext; outdata: pointer; var outdata_size: cint; avpkt: PAVPacket): cint; cdecl;
+    (**
+     * Codec capabilities.
+     * see CODEC_CAP_*
+     *)
+    capabilities: cint;
+    next: PAVCodec;
+    (**
+     * Flush buffers.
+     * Will be called when seeking
+     *)
+    flush: procedure (avctx: PAVCodecContext); cdecl;
+    supported_framerates: {const} PAVRational; ///< array of supported framerates, or NULL if any, array is terminated by {0,0}
+    pix_fmts: {const} PAVPixelFormat;       ///< array of supported pixel formats, or NULL if unknown, array is terminated by -1
+    (**
+     * Descriptive name for the codec, meant to be more human readable than name.
+     * You should use the NULL_IF_CONFIG_SMALL() macro to define it.
+     *)
+    long_name: {const} PAnsiChar;
+    supported_samplerates: {const} PCint;      ///< array of supported audio samplerates, or NULL if unknown, array is terminated by 0
+    sample_fmts: {const} PAVSampleFormatArray; ///< array of supported sample formats, or NULL if unknown, array is terminated by -1
+    channel_layouts: {const} PCint64;          ///< array of support channel layouts, or NULL if unknown. array is terminated by 0
+    max_lowres: byte;                          ///< array of support channel layouts, or NULL if unknown. array is terminated by 0
+    priv_class: {const} PAVClass;              ///< AVClass for the private context
+    profiles: {const} PAVProfile;              ///< array of recognized profiles, or NULL if unknown, array is terminated by {FF_PROFILE_UNKNOWN}
+
+    (**
+     * @defgroup framethreading Frame-level threading support functions.
+     * @{
+     *)
+    (**
+     * If defined, called on thread contexts when they are created.
+     * If the codec allocates writable tables in init(), re-allocate them here.
+     * priv_data will be set to a copy of the original.
+     *)
+    init_thread_copy: function (avctx: PAVCodecContext): Pcint;
+    (**
+     * Copy necessary context variables from a previous thread context to the current one.
+     * If not defined, the next thread will start automatically; otherwise, the codec
+     * must call ff_thread_finish_setup().
+     *
+     * dst and src will (rarely) point to the same context, in which case memcpy should be skipped.
+     *)
+    update_thread_context: function (dst: PAVCodecContext; src: {const} PAVCodecContext);
+    (** @} *)
+  end; {TAVCodec}
+
+(**
+ * AVHWAccel.
+ *)
+  TAVHWAccel = record
+    (**
+     * 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).
+     *)
+    name: PAnsiChar;
+
+    (**
+     * Type of codec implemented by the hardware accelerator.
+     *
+     * See AVMediaType_xxx
+     *)
+    type_: TAVMediaType;
+    
+    (**
+     * Codec implemented by the hardware accelerator.
+     *
+     * See CODEC_ID_xxx
+     *)
+    id: TCodecID;
+
+    (**
+     * Supported pixel format.
+     *
+     * Only hardware accelerated formats are supported here.
+     *)
+    pix_fmt: PAVPixelFormat; 
+
+    (**
+     * Hardware accelerated codec capabilities.
+     * see FF_HWACCEL_CODEC_CAP_*
+     *)
+    capabilities: cint;
+
+    next: PAVHWAccel;
+
+    (**
+     * Called at the beginning of each frame or field picture.
+     *
+     * Meaningful frame information (codec specific) is guaranteed to
+     * be parsed at this point. This function is mandatory.
+     *
+     * Note that buf can be NULL along with buf_size set to 0.
+     * Otherwise, this means the whole frame is available at this point.
+     *
+     * @param avctx the codec context
+     * @param buf the frame data buffer base
+     * @param buf_size the size of the frame in bytes
+     * @return zero if successful, a negative value otherwise
+     *)
+    start_frame: function (avctx:       PAVCodecContext; 
+                           buf: {const} PByteArray; 
+                           buf_size:    cuint): cint; cdecl;
+
+    (**
+     * 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
+     *)
+    decode_slice: function (avctx:       PAVCodecContext;
+                            buf: {const} PByteArray; 
+                            buf_size:    cuint): cint; cdecl;
+
+    (**
+     * 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
+     *)
+    end_frame: function (avctx: PAVCodecContext): cint; cdecl;
+        
+    (**
+     * Size of HW accelerator private data.
+     *
+     * Private data is allocated with av_mallocz() before
+     * AVCodecContext.get_buffer() and deallocated after
+     * AVCodecContext.release_buffer().
+     *)
+    priv_data_size: cint;
+  end; {TAVHWAccel}
+
+(**
+ * four components are given, that's all.
+ * the last component is alpha
+ *)
+  PAVPicture = ^TAVPicture;
+  TAVPicture = record
+    data: array [0..3] of PByteArray;
+    linesize: array [0..3] of cint;       ///< number of bytes per line
+  end; {TAVPicture}
+
+{$IFDEF FF_API_PALETTE_CONTROL}
+(**
+ * AVPaletteControl
+ * This structure defines a method for communicating palette changes
+ * between and demuxer and a decoder.
+ *
+ * @deprecated Use AVPacket to send palette changes instead.
+ * This is totally broken.
+ *)
+  PAVPaletteControl = ^TAVPaletteControl;
+  TAVPaletteControl = record
+    (* demuxer sets this to 1 to indicate the palette has changed;
+     * decoder resets to 0 *)
+    palette_changed: cint;
+
+    (* 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 cuint;
+  end; {deprecated;}
+{$ENDIF}
+
+  TAVSubtitleType = (
+    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
+  ); {TAVSubtitleType}
+
+  PPAVSubtitleRect = ^PAVSubtitleRect;
+  PAVSubtitleRect = ^TAVSubtitleRect;
+  TAVSubtitleRect = record
+    x: cint;        ///< top left corner  of pict, undefined when pict is not set
+    y: cint;        ///< top left corner  of pict, undefined when pict is not set
+    w: cint;        ///< width            of pict, undefined when pict is not set
+    h: cint;        ///< height           of pict, undefined when pict is not set
+    nb_colors: cint; ///< 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
+     *)
+    pict: TAVPicture;
+    type_: TAVSubtitleType;
+
+    text: PAnsiChar;                     ///< 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.
+     *)
+    ass: PAnsiChar;
+  end; {TAVSubtitleRect}
+
+  PPAVSubtitle = ^PAVSubtitle;
+  PAVSubtitle = ^TAVSubtitle;
+  TAVSubtitle = record
+    format: cuint16; (* 0 = graphics *)
+    start_display_time: cuint32; (* relative to packet pts, in ms *)
+    end_display_time: cuint32; (* relative to packet pts, in ms *)
+    num_rects: cuint;
+    rects: PPAVSubtitleRect;
+    pts: cint64;     ///< Same as packet pts, in AV_TIME_BASE
+  end; {TAVSubtitle}
+
+(* packet functions *)
+
+(**
+ * @deprecated use NULL instead
+ *)
+procedure av_destruct_packet_nofree(pkt: PAVPacket);
+  cdecl; external av__codec; deprecated;
+
+(*
+ * Default packet destructor.
+ *)
+procedure av_destruct_packet(pkt: PAVPacket);
+  cdecl; external av__codec;
+
+(*
+ * Initialize optional fields of a packet with default values.
+ *
+ * @param pkt packet
+ *)
+procedure av_init_packet(var pkt: TAVPacket);
+  cdecl; external av__codec;
+
+(*
+ * Allocate the payload of a packet and initialize its fields with
+ * default values.
+ *
+ * @param pkt packet
+ * @param size wanted payload size
+ * @return 0 if OK, AVERROR_xxx otherwise
+ *)
+function av_new_packet(pkt: PAVPacket; size: cint): cint;
+  cdecl; external av__codec;
+
+(*
+ * Reduce packet size, correctly zeroing padding
+ *
+ * @param pkt packet
+ * @param size new size
+ *)
+procedure av_shrink_packet(pkt: PAVPacket; size: cint);
+  cdecl; external av__codec;
+
+(*
+ * @warning This is a hack - the packet memory allocation stuff is broken. The
+ * packet is allocated if it was not really allocated.
+ *)
+function av_dup_packet(pkt: PAVPacket): cint;
+  cdecl; external av__codec;
+
+(*
+ * Free a packet.
+ *
+ * @param pkt packet to free
+ *)
+procedure av_free_packet(pkt: PAVPacket);
+  cdecl; external av__codec;
+
+(* resample.c *)
+type
+  PReSampleContext = pointer;
+  PAVResampleContext = pointer;
+  PImgReSampleContext = pointer;
+
+{$IFDEF FF_API_AUDIO_OLD}
+(**
+ * @deprecated Use av_audio_resample_init() instead.
+ *)
+function audio_resample_init (output_channels: cint; input_channels: cint;
+                              output_rate: cint; input_rate: cint): PReSampleContext;
+  cdecl; external av__codec; deprecated;
+{$ENDIF}
+
+(**
+ *  Initialize audio resampling context.
+ *
+ * @param output_channels  number of output channels
+ * @param input_channels   number of input channels
+ * @param output_rate      output sample rate
+ * @param input_rate       input sample rate
+ * @param sample_fmt_out   requested output sample format
+ * @param sample_fmt_in    input sample format
+ * @param filter_length    length of each FIR filter in the filterbank relative to the cutoff frequency
+ * @param log2_phase_count log2 of the number of entries in the polyphase filterbank
+ * @param linear           if 1 then the used FIR filter will be linearly interpolated
+                           between the 2 closest, if 0 the closest will be used
+ * @param cutoff           cutoff frequency, 1.0 corresponds to half the output sampling rate
+ * @return allocated ReSampleContext, NULL if error occured
+ *)
+ function av_audio_resample_init(output_channels: cint; input_channels: cint;
+                                 output_rate: cint; input_rate: cint;
+                                 sample_fmt_out: TAVSampleFormat;
+                                 sample_fmt_in: TAVSampleFormat;
+                                 filter_length: cint; log2_phase_count: cint;
+                                 linear: cint; double cutoff: cdouble): PReSampleContext;
+  cdecl; external av__codec;
+					
+function audio_resample (s: PReSampleContext; output: PSmallint; input: PSmallint; nb_samples: cint): cint;
+  cdecl; external av__codec;
+
+(**
+ * Free resample context.
+ *
+ * @param s a non-NULL pointer to a resample context previously
+ *          created with av_audio_resample_init()
+ *)
+procedure audio_resample_close (s: PReSampleContext);
+  cdecl; external av__codec;
+
+(**
+ * Initialize an audio resampler.
+ * Note, if either rate is not an integer then simply scale both rates up so they are.
+ * @param filter_length length of each FIR filter in the filterbank relative to the cutoff freq
+ * @param log2_phase_count log2 of the number of entries in the polyphase filterbank
+ * @param linear If 1 then the used FIR filter will be linearly interpolated
+                 between the 2 closest, if 0 the closest will be used
+ * @param cutoff cutoff frequency, 1.0 corresponds to half the output sampling rate
+ *)
+function av_resample_init (out_rate: cint; in_rate: cint; filter_length: cint;
+                           log2_phase_count: cint; linear: cint; cutoff: cdouble): PAVResampleContext;
+  cdecl; external av__codec;
+
+(**
+ * Resample an array of samples using a previously configured context.
+ * @param src an array of unconsumed samples
+ * @param consumed the number of samples of src which have been consumed are returned here
+ * @param src_size the number of unconsumed samples available
+ * @param dst_size the amount of space in samples available in dst
+ * @param update_ctx If this is 0 then the context will not be modified, that way several channels can be resampled with the same context.
+ * @return the number of samples written in dst or -1 if an error occurred
+ *)
+function av_resample (c: PAVResampleContext; dst: PSmallint; src: PSmallint; var consumed: cint;
+                      src_size: cint; dst_size: cint; update_ctx: cint): cint;
+  cdecl; external av__codec;
+
+(**
+ * Compensate samplerate/timestamp drift. The compensation is done by changing
+ * the resampler parameters, so no audible clicks or similar distortions occur
+ * @param compensation_distance distance in output samples over which the compensation should be performed
+ * @param sample_delta number of output samples which should be output less
+ *
+ * example: av_resample_compensate(c, 10, 500)
+ * here instead of 510 samples only 500 samples would be output
+ *
+ * note, due to rounding the actual compensation might be slightly different,
+ * especially if the compensation_distance is large and the in_rate used during init is small
+ *)
+procedure av_resample_compensate (c: PAVResampleContext; sample_delta: cint;
+                                  compensation_distance: cint);
+  cdecl; external av__codec;
+
+procedure av_resample_close (c: PAVResampleContext);
+  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 Zero if successful, a negative value if not.
+ *)
+function avpicture_alloc (picture: PAVPicture; pix_fmt: TAVPixelFormat;
+                          width: cint; height: cint): cint;
+  cdecl; external av__codec;
+
+(**
+ * Free a picture previously allocated by avpicture_alloc().
+ *
+ * @param picture the AVPicture to be freed
+ *)
+procedure avpicture_free (picture: PAVPicture);
+  cdecl; external av__codec;
+
+(**
+ * Fill in the AVPicture fields.
+ * The fields of the given AVPicture are filled in by using the 'ptr' address
+ * which points to the image data buffer. Depending on the specified picture
+ * format, one or multiple image data pointers and line sizes will be set.
+ * If a planar format is specified, several pointers will be set pointing to
+ * the different picture planes and the line sizes of the different planes
+ * will be stored in the lines_sizes array.
+ * Call with ptr == NULL to get the required size for the ptr buffer.
+ *
+ * @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
+ *)
+function avpicture_fill (picture: PAVPicture; ptr: pcuint8;
+                 pix_fmt: TAVPixelFormat; width: cint; height: cint): cint;
+  cdecl; external av__codec;
+
+(**
+ * Copy pixel data from an AVPicture into a buffer.
+ * The data is stored compactly, without any gaps for alignment or padding
+ * which may be applied by avpicture_fill().
+ *
+ * \see avpicture_get_size()
+ *
+ * @param[in] src AVPicture containing image data
+ * @param[in] pix_fmt The format in which the picture data is stored.
+ * @param[in] width the width of the image in pixels.
+ * @param[in] height the height of the image in pixels.
+ * @param[out] dest A buffer into which picture data will be copied.
+ * @param[in] dest_size The size of 'dest'.
+ * @return The number of bytes written to dest, or a negative value (error code) on error.
+ *)
+function avpicture_layout (src: {const} PAVPicture; pix_fmt: TAVPixelFormat;
+                   width: cint; height: cint;
+                   dest: PByteArray; dest_size: cint): cint;
+  cdecl; external av__codec;
+
+(**
+ * Calculate the size in bytes that a picture of the given width and height
+ * would occupy if stored in the given picture format.
+ * Note that this returns the size of a compact representation as generated
+ * by avpicture_layout, which can be smaller than the size required for e.g.
+ * avpicture_fill.
+ *
+ * @param pix_fmt the given picture format
+ * @param width the width of the image
+ * @param height the height of the image
+ * @return Image data size in bytes or -1 on error (e.g. too large dimensions).
+ *)
+function avpicture_get_size (pix_fmt: TAVPixelFormat; width: cint; height: cint): cint;
+  cdecl; external av__codec;
+
+procedure avcodec_get_chroma_sub_sample (pix_fmt: TAVPixelFormat; var h_shift: cint; var v_shift: cint);
+  cdecl; external av__codec;
+
+{$IFDEF FF_API_GET_PIX_FMT_NAME}
+(**
+ * Return the short name for a pixel format.
+ *
+ * \see av_get_pix_fmt(), av_get_pix_fmt_string().
+ * @deprecated Deprecated in favor of av_get_pix_fmt_name().
+ *)
+function avcodec_get_pix_fmt_name(pix_fmt: TAVPixelFormat): PAnsiChar;
+  cdecl; external av__codec; deprecated;
+{$ENDIF}
+
+procedure avcodec_set_dimensions(s: PAVCodecContext; width: cint; height: cint);
+  cdecl; external av__codec;
+
+{$IF LIBAVCODEC_MAX_VERSION_MAJOR < 53}
+(**
+ * Return the pixel format corresponding to the name name.
+ *
+ * If there is no pixel format with name name, then looks for a
+ * pixel format with the name corresponding to the native endian
+ * format of name.
+ * For example in a little-endian system, first looks for "gray16",
+ * then for "gray16le".
+ *
+ * Finally if no pixel format has been found, returns PIX_FMT_NONE.*
+ * @deprecated Deprecated in favor of av_get_pix_fmt().
+ *)
+function avcodec_get_pix_fmt(name: {const} PAnsiChar): TAVPixelFormat;
+  cdecl; external av__codec; deprecated;
+{$IFEND}
+
+(**
+ * Return a value representing the fourCC code associated to the
+ * pixel format pix_fmt, or 0 if no associated fourCC code can be
+ * found.
+ *)
+function avcodec_pix_fmt_to_codec_tag(pix_fmt: TAVPixelFormat): cuint;
+  cdecl; external av__codec;
+
+(**
+ * Put a string representing the codec tag codec_tag in buf.
+ *
+ * @param buf_size size in bytes of buf
+ * @return the length of the string that would have been generated if
+ * enough space had been available, excluding the trailing null
+ *)
+function av_get_codec_tag_string(buf: PAnsiChar; buf_size: size_t; codec_tag: cuint): size_t;
+  cdecl; external av__codec;
+
+const
+  FF_LOSS_RESOLUTION  = $0001; {**< loss due to resolution change *}
+  FF_LOSS_DEPTH       = $0002; {**< loss due to color depth change *}
+  FF_LOSS_COLORSPACE  = $0004; {**< loss due to color space conversion *}
+  FF_LOSS_ALPHA       = $0008; {**< loss of alpha bits *}
+  FF_LOSS_COLORQUANT  = $0010; {**< loss due to color quantization *}
+  FF_LOSS_CHROMA      = $0020; {**< loss of chroma (e.g. RGB to gray conversion) *}
+
+(**
+ * Compute what kind of losses will occur when converting from one specific
+ * pixel format to another.
+ * When converting from one pixel format to another, information loss may occur.
+ * For example, when converting from RGB24 to GRAY, the color information will
+ * be lost. Similarly, other losses occur when converting from some formats to
+ * other formats. These losses can involve loss of chroma, but also loss of
+ * resolution, loss of color depth, loss due to the color space conversion, loss
+ * of the alpha bits or loss due to color quantization.
+ * avcodec_get_fix_fmt_loss() informs you about the various types of losses
+ * which will occur when converting from one pixel format to another.
+ *
+ * @param[in] dst_pix_fmt destination pixel format
+ * @param[in] src_pix_fmt source pixel format
+ * @param[in] has_alpha Whether the source pixel format alpha channel is used.
+ * @return Combination of flags informing you what kind of losses will occur.
+ *)
+function avcodec_get_pix_fmt_loss (dst_pix_fmt: TAVPixelFormat; src_pix_fmt: TAVPixelFormat;
+                           has_alpha: cint): cint;
+  cdecl; external av__codec;
+
+(**
+ * Find the best pixel format to convert to given a certain source pixel
+ * format.  When converting from one pixel format to another, information loss
+ * may occur.  For example, when converting from RGB24 to GRAY, the color
+ * information will be lost. Similarly, other losses occur when converting from
+ * some formats to other formats. avcodec_find_best_pix_fmt() searches which of
+ * the given pixel formats should be used to suffer the least amount of loss.
+ * The pixel formats from which it chooses one, are determined by the
+ * pix_fmt_mask parameter.
+ *
+ * @code
+ * src_pix_fmt = PIX_FMT_YUV420P;
+ * pix_fmt_mask = (1 << PIX_FMT_YUV422P) || (1 << PIX_FMT_RGB24);
+ * dst_pix_fmt = avcodec_find_best_pix_fmt(pix_fmt_mask, src_pix_fmt, alpha, &loss);
+ * @endcode
+ *
+ * @param[in] pix_fmt_mask bitmask determining which pixel format to choose from
+ * @param[in] src_pix_fmt source pixel format
+ * @param[in] has_alpha Whether the source pixel format alpha channel is used.
+ * @param[out] loss_ptr Combination of flags informing you what kind of losses will occur.
+ * @return The best pixel format to convert to or -1 if none was found.
+ *)
+function avcodec_find_best_pix_fmt(pix_fmt_mask: cint64; src_pix_fmt: TAVPixelFormat;
+                      has_alpha: cint; loss_ptr: PCint): TAVPixelFormat;
+  cdecl; external av__codec;
+
+{$IFDEF LIBAVCODEC_VERSION_MAJOR < 53}
+(**
+ * @deprecated Use av_get_pix_fmt_string() instead.
+ *)
+procedure avcodec_pix_fmt_string (buf: PAnsiChar; buf_size: cint; pix_fmt: TAVPixelFormat);
+  cdecl; external av__codec; deprecated;
+{$IFEND}
+
+const
+  FF_ALPHA_TRANSP      = $0001; {* image has some totally transparent pixels *}
+  FF_ALPHA_SEMI_TRANSP = $0002; {* image has some transparent pixels *}
+
+(**
+ * Tell if an image really has transparent alpha values.
+ * @return ored mask of FF_ALPHA_xxx constants
+ *)
+function img_get_alpha_info (src: {const} PAVPicture;
+                             pix_fmt: TAVPixelFormat;
+                             width:   cint;
+                             height:  cint): cint;
+  cdecl; external av__codec;
+
+(* deinterlace a picture *)
+(* deinterlace - if not supported return -1 *)
+function avpicture_deinterlace (dst: PAVPicture;
+                        src: {const} PAVPicture;
+                        pix_fmt: TAVPixelFormat;
+                        width:   cint;
+                        height:  cint): cint;
+  cdecl; external av__codec;
+
+(* external high level API *)
+
+(**
+ * If c is NULL, returns the first registered codec,
+ * if c is non-NULL, returns the next registered codec after c,
+ * or NULL if c is the last one.
+ *)
+function av_codec_next(c: PAVCodec): PAVCodec;
+  cdecl; external av__codec;
+
+(**
+ * Return the LIBAVCODEC_VERSION_INT constant.
+ *)
+function avcodec_version(): cuint;
+  cdecl; external av__codec;
+
+(**
+ * Return the libavcodec build-time configuration.
+ *)
+function avcodec_configuration(): PAnsiChar;
+  cdecl; external av__codec;
+
+(**
+ * Return the libavcodec license.
+ *)
+function avcodec_license(): PAnsiChar;
+  cdecl; external av__codec;
+
+(**
+ * Initialize libavcodec.
+ *
+ * @warning This function must be called before any other libavcodec
+ * function.
+ *
+ * @warning This function is not thread-safe.
+ *)
+procedure avcodec_init();
+  cdecl; external av__codec;
+
+{$IF LIBAVCODEC_VERSION_MAJOR < 53}
+(**
+ * @deprecated Deprecated in favor of avcodec_register().
+ *)
+procedure register_avcodec(codec: PAVCodec);
+  cdecl; external av__codec; deprecated;
+{$ENDIF}
+
+(**
+ * Register the codec codec and initialize libavcodec.
+ *
+ * @see avcodec_init(), avcodec_register_all()
+ *)
+procedure register_avcodec(codec: PAVCodec);
+  cdecl; external av__codec;
+
+(**
+ * Find a registered encoder with a matching codec ID.
+ *
+ * @param id CodecID of the requested encoder
+ * @return An encoder if one was found, NULL otherwise.
+ *)
+function avcodec_find_encoder(id: TCodecID): PAVCodec;
+  cdecl; external av__codec;
+
+(**
+ * Find a registered encoder with the specified name.
+ *
+ * @param name name of the requested encoder
+ * @return An encoder if one was found, NULL otherwise.
+ *)
+function avcodec_find_encoder_by_name(name: PAnsiChar): PAVCodec;
+  cdecl; external av__codec;
+
+(**
+ * Find a registered decoder with a matching codec ID.
+ *
+ * @param id CodecID of the requested decoder
+ * @return A decoder if one was found, NULL otherwise.
+ *)
+function avcodec_find_decoder(id: TCodecID): PAVCodec;
+  cdecl; external av__codec;
+
+(**
+ * Find a registered decoder with the specified name.
+ *
+ * @param name name of the requested decoder
+ * @return A decoder if one was found, NULL otherwise.
+ *)
+function avcodec_find_decoder_by_name(name: PAnsiChar): PAVCodec;
+  cdecl; external av__codec;
+procedure avcodec_string(buf: PAnsiChar; buf_size: cint; enc: PAVCodecContext; encode: cint);
+  cdecl; external av__codec;
+
+(**
+ * Return a name for the specified profile, if available.
+ *
+ * @param codec the codec that is searched for the given profile
+ * @param profile the profile value for which a name is requested
+ * @return A name for the profile if found, NULL otherwise.
+ *)
+function av_get_profile_name(codec: {const} PAVCodec; profile: cint): {const} PAnsiChar;
+  cdecl; external av__codec;
+
+(**
+ * Set the fields of the given AVCodecContext to default values.
+ *
+ * @param s The AVCodecContext of which the fields should be set to default values.
+ *)
+procedure avcodec_get_context_defaults(s: PAVCodecContext);
+  cdecl; external av__codec;
+
+(** THIS FUNCTION IS NOT YET PART OF THE PUBLIC API!
+ *  we WILL change its arguments and name a few times! *)
+procedure avcodec_get_context_defaults2(s: PAVCodecContext; ctype: TAVMediaType);
+  cdecl; external av__codec;
+
+(** THIS FUNCTION IS NOT YET PART OF THE PUBLIC API!
+ *  we WILL change its arguments and name a few times! *)
+procedure avcodec_get_context_defaults3(s: PAVCodecContext; codec: PAVCodec);
+  cdecl; external av__codec;
+
+(**
+ * Allocate an AVCodecContext and sets it 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
+ *)
+function avcodec_alloc_context(): PAVCodecContext;
+  cdecl; external av__codec;
+
+(** THIS FUNCTION IS NOT YET PART OF THE PUBLIC API!
+ *  we WILL change its arguments and name a few times! *)
+function avcodec_alloc_context2(ctype: TAVMediaType): PAVCodecContext;
+  cdecl; external av__codec;
+
+(** THIS FUNCTION IS NOT YET PART OF THE PUBLIC API!
+ *  we WILL change its arguments and name a few times! *)
+function avcodec_alloc_context3(codec: PAVCodec): PAVCodecContext;
+  cdecl; external av__codec;
+
+(**
+ * Copy the settings of the source AVCodecContext into the destination
+ * AVCodecContext. The resulting destination codec context will be
+ * unopened, i.e. you are required to call avcodec_open() before you
+ * can use this AVCodecContext to decode/encode video/audio data.
+ *
+ * @param dest target codec context, should be initialized with
+ *             avcodec_alloc_context(), but otherwise uninitialized
+ * @param src source codec context
+ * @return AVERROR() on error (e.g. memory allocation error), 0 on success
+ *)
+function avcodec_copy_context(dest: PAVCodecContext; src: {const} PAVCodecContext): cint;
+  cdecl; external av__codec;
+
+(**
+ * Set the fields of the given AVFrame to default values.
+ *
+ * @param pic The AVFrame of which the fields should be set to default values.
+ *)
+procedure avcodec_get_frame_defaults (pic: PAVFrame);
+  cdecl; external av__codec;
+
+(**
+ * Allocate an AVFrame and set its fields to default values.  The resulting
+ * struct can be deallocated by simply calling av_free().
+ *
+ * @return An AVFrame filled with default values or NULL on failure.
+ * @see avcodec_get_frame_defaults
+ *)
+function avcodec_alloc_frame(): PAVFrame;
+  cdecl; external av__codec;
+
+function avcodec_default_get_buffer (s: PAVCodecContext; pic: PAVFrame): cint;
+  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): cint;
+  cdecl; external av__codec;
+
+(**
+ * Return the amount of padding in pixels which the get_buffer callback must
+ * provide around the edge of the image for codecs which do not have the
+ * CODEC_FLAG_EMU_EDGE flag.
+ *
+ * @return Required padding in pixels.
+ *)
+function avcodec_get_edge_width(): cuint;
+  cdecl; external av__codec;
+
+(**
+ * Modify width and height values so that they will result in a memory
+ * buffer that is acceptable for the codec if you do not use any horizontal
+ * padding.
+ *
+ * May only be used if a codec with CODEC_CAP_DR1 has been opened.
+ * If CODEC_FLAG_EMU_EDGE is not set, the dimensions must have been increased
+ * according to avcodec_get_edge_width() before.
+ *)
+procedure avcodec_align_dimensions(s: PAVCodecContext; width: PCint; height: PCint);
+  cdecl; external av__codec;
+
+(**
+ * Modifiy width and height values so that they will result in a memory
+ * buffer that is acceptable for the codec if you also ensure that all
+ * line sizes are a multiple of the respective linesize_align[i].
+ *
+ * May only be used if a codec with CODEC_CAP_DR1 has been opened.
+ * If CODEC_FLAG_EMU_EDGE is not set, the dimensions must have been increased
+ * according to avcodec_get_edge_width() before.
+ *)
+procedure avcodec_align_dimensions2(s: PAVCodecContext; width: PCint; height: PCint;
+                                    linesize_align: PQuadIntArray);
+  cdecl; external av__codec;
+
+{$IF LIBAVCODEC_VERSION_MAJOR < 53}
+(**
+ * @deprecated Deprecated in favor of av_check_image_size().
+ *)
+function avcodec_check_dimensions(av_log_ctx: pointer; w: cuint; h: cuint): cint;
+  cdecl; external av__codec; deprecated;
+{$IFEND}
+
+function avcodec_default_get_format(s: PAVCodecContext; fmt: {const} PAVPixelFormat): TAVPixelFormat;
+  cdecl; external av__codec;
+
+{$IFDEF FF_API_THREAD_INIT}
+(**
+ * @deprecated Set s->thread_count before calling avcodec_open() instead of calling this.
+ *)
+function avcodec_thread_init(s: PAVCodecContext; thread_count: cint): cint;
+  cdecl; external av__codec; deprecated;
+procedure avcodec_thread_free(s: PAVCodecContext);
+  cdecl; external av__codec; deprecated;
+{$ENDIF}
+
+function avcodec_default_execute(s: PAVCodecContext; func: TExecuteFunc; arg: Pointer; var ret: cint; count: cint; size: cint): cint;
+  cdecl; external av__codec;
+
+function avcodec_default_execute2(s: PAVCodecContext; func: TExecuteFunc; arg: Pointer; var ret: cint; count: cint): cint;
+  cdecl; external av__codec;
+//FIXME func typedef
+
+(**
+ * Initialize the AVCodecContext to use the given AVCodec. Prior to using this
+ * function the context has to be allocated.
+ *
+ * The functions avcodec_find_decoder_by_name(), avcodec_find_encoder_by_name(),
+ * avcodec_find_decoder() and avcodec_find_encoder() provide an easy way for
+ * retrieving a codec.
+ *
+ * @warning This function is not thread safe!
+ *
+ * @code
+ * avcodec_register_all();
+ * codec = avcodec_find_decoder(CODEC_ID_H264);
+ * if (!codec)
+ *     exit(1);
+ *
+ * context = avcodec_alloc_context();
+ *
+ * if (avcodec_open(context, codec) < 0)
+ *     exit(1);
+ * @endcode
+ *
+ * @param avctx The context which will be set up to use the given codec.
+ * @param codec The codec to use within the context.
+ * @return zero on success, a negative value on error
+ * @see avcodec_alloc_context, avcodec_find_decoder, avcodec_find_encoder
+ *)
+function avcodec_open(avctx: PAVCodecContext; codec: PAVCodec): cint;
+  cdecl; external av__codec;
+
+
+{$IFDEF FF_API_AUDIO_OLD}
+(**
+ * Decode an audio frame from buf into samples.
+ * Wrapper function which calls avcodec_decode_audio3.
+ *
+ * @deprecated Use avcodec_decode_audio3 instead.
+ * @param avctx the codec context
+ * @param[out] samples the output buffer, sample type in avctx->sample_fmt
+ * @param[in,out] frame_size_ptr the output buffer size in bytes
+ * @param[in] buf the input buffer
+ * @param[in] buf_size the input buffer size in bytes
+ * @return On error a negative value is returned, otherwise the number of bytes
+ * used or zero if no frame could be decompressed.
+ *)
+function avcodec_decode_audio2(avctx: PAVCodecContext; samples: PSmallint;
+               var frame_size_ptr: cint;
+               buf: {const} PByteArray; buf_size: cint): cint;
+  cdecl; external av__codec; deprecated;
+{$IFEND}
+
+(**
+ * Decode the audio frame of size avpkt->size from avpkt->data into samples.
+ * Some decoders may support multiple frames in a single AVPacket, such
+ * decoders would then just decode the first frame. In this case,
+ * avcodec_decode_audio3 has to be called again with an AVPacket that contains
+ * the remaining data in order to decode the second frame etc.
+ * If no frame
+ * could be outputted, frame_size_ptr is zero. Otherwise, it is the
+ * decompressed frame size in bytes.
+ *
+ * @warning You must set frame_size_ptr to the allocated size of the
+ * output buffer before calling avcodec_decode_audio3().
+ *
+ * @warning The input buffer must be FF_INPUT_BUFFER_PADDING_SIZE larger than
+ * the actual read bytes because some optimized bitstream readers read 32 or 64
+ * bits at once and could read over the end.
+ *
+ * @warning The end of the input buffer avpkt->data should be set to 0 to ensure that
+ * no overreading happens for damaged MPEG streams.
+ *
+ * @note You might have to align the input buffer avpkt->data and output buffer
+ * samples. The alignment requirements depend on the CPU: On some CPUs it isn't
+ * necessary at all, on others it won't work at all if not aligned and on others
+ * * it will work but it will have an impact on performance.
+ *
+ * In practice, avpkt->data should have 4 byte alignment at minimum and
+ * samples should be 16 byte aligned unless the CPU doesn't need it
+ * (AltiVec and SSE do).
+ *
+ * @note Some codecs have a delay between input and output, these need to be
+ * fed with avpkt->data=NULL, avpkt->size=0 at the end to return the remaining frames.
+ *
+ * @param avctx the codec context
+ * @param[out] samples the output buffer
+ * @param[in,out] frame_size_ptr the output buffer size in bytes
+ * @param[in] avpkt The input AVPacket containing the input buffer.
+ *            You can create such packet with av_init_packet() and by then setting
+ *            data and size, some decoders might in addition need other fields.
+ *            All decoders are designed to use the least fields possible though.
+ * @return On error a negative value is returned, otherwise the number of bytes
+ * used or zero if no frame data was decompressed (used) from the input AVPacket.
+ *)
+function avcodec_decode_audio3(avctx: PAVCodecContext; samples: PSmallint;
+               var frame_size_ptr: cint;
+               avpkt: PAVPacket): cint;
+  cdecl; external av__codec;
+
+{$IFDEF FF_API_VIDEO_OLD}
+(**
+ * Decode a video frame from buf into picture.
+ * Wrapper function which calls avcodec_decode_video2.
+ *
+ * @deprecated Use avcodec_decode_video2 instead.
+ * @param avctx the codec context
+ * @param[out] picture The AVFrame in which the decoded video frame will be stored.
+ *             Use avcodec_alloc_frame to get an AVFrame, the codec will
+ *             allocate memory for the actual bitmap.
+ *             with default get/release_buffer(), the decoder frees/reuses the bitmap as it sees fit.
+ *             with overridden get/release_buffer() (needs CODEC_CAP_DR1) the user decides into what buffer the decoder
+ *                   decodes and the decoder tells the user once it does not need the data anymore,
+ *                   the user app can at this point free/reuse/keep the memory as it sees fit.
+ *
+ * @param[in] buf the input buffer
+ * @param[in] buf_size the size of the input buffer in bytes
+ * @param[in,out] got_picture_ptr Zero if no frame could be decompressed, otherwise, it is nonzero.
+ * @return On error a negative value is returned, otherwise the number of bytes
+ * used or zero if no frame could be decompressed.
+ *)
+function avcodec_decode_video(avctx: PAVCodecContext; picture: PAVFrame;
+                       var got_picture_ptr: cint;
+                       buf: {const} PByteArray; buf_size: cint): cint;
+  cdecl; external av__codec; deprecated;
+{$ENDIF}
+
+(**
+ * Decode the video frame of size avpkt->size from avpkt->data into picture.
+ * Some decoders may support multiple frames in a single AVPacket, such
+ * decoders would then just decode the first frame.
+ *
+ * @warning The input buffer must be FF_INPUT_BUFFER_PADDING_SIZE larger than
+ * the actual read bytes because some optimized bitstream readers read 32 or 64
+ * bits at once and could read over the end.
+ *
+ * @warning The end of the input buffer buf should be set to 0 to ensure that
+ * no overreading happens for damaged MPEG streams.
+ *
+ * @note You might have to align the input buffer avpkt->data.
+ * The alignment requirements depend on the CPU: on some CPUs it isn't
+ * necessary at all, on others it won't work at all if not aligned and on others
+ * it will work but it will have an impact on performance.
+ *
+ * In practice, avpkt->data should have 4 byte alignment at minimum.
+ *
+ * @param avctx the codec context
+ * @param[out] picture The AVFrame in which the decoded video frame will be stored.
+ * @param[in] avpkt The input AVpacket containing the input buffer.
+ *            You can create such packet with av_init_packet() and by then setting
+ *            data and size, some decoders might in addition need other fields like
+ *            flags&AV_PKT_FLAG_KEY. All decoders are designed to use the least
+ *            fields possible.
+ * @param[in,out] got_picture_ptr Zero if no frame could be decompressed, otherwise, it is nonzero.
+ * @return On error a negative value is returned, otherwise the number of bytes
+ * used or zero if no frame could be decompressed.
+ *)
+function avcodec_decode_video2(avctx: PAVCodecContext; picture: PAVFrame;
+                       var got_picture_ptr: cint;
+                       avpkt: PAVPacket): cint;
+  cdecl; external av__codec;
+
+{$IFDEF FF_API_SUBTITLE_OLD}
+(* Decode a subtitle message. Return -1 if error, otherwise return the
+ * number of bytes used. If no subtitle could be decompressed,
+ * got_sub_ptr is zero. Otherwise, the subtitle is stored in*sub.
+ *)
+function avcodec_decode_subtitle(avctx: PAVCodecContext; sub: PAVSubtitle;
+                          var got_sub_ptr: cint;
+                          buf: {const} PByteArray; buf_size: cint): cint;
+  cdecl; external av__codec; deprecated;
+{$ENDIF}
+  
+(* Decode a subtitle message.
+ * Return a negative value on error, otherwise return the number of bytes used.
+ * If no subtitle could be decompressed, got_sub_ptr is zero.
+ * Otherwise, the subtitle is stored in *sub.
+ * Note that CODEC_CAP_DR1 is not available for subtitle codecs. This is for
+ * simplicity, because the performance difference is expect to be negligible 
+ * and reusing a get_buffer written for video codecs would probably perform badly
+ * due to a potentially very different allocation pattern.
+ *
+ * @param avctx the codec context
+ * @param[out] sub The AVSubtitle in which the decoded subtitle will be stored, must be
+                   freed with avsubtitle_free if *got_sub_ptr is set.
+ * @param[in,out] got_sub_ptr Zero if no subtitle could be decompressed, otherwise, it is nonzero.
+ * @param[in] avpkt The input AVPacket containing the input buffer.
+ *)
+function avcodec_decode_subtitle2(avctx: PAVCodecContext; sub: PAVSubtitle;
+                          var got_sub_ptr: cint;
+                          avpkt: PAVPacket): cint;
+  cdecl; external av__codec;
+
+(**
+ * Frees all allocated data in the given subtitle struct.
+ *
+ * @param sub AVSubtitle to free.
+ *)
+procedure avsubtitle_free(sub: PAVSubtitle);
+  cdecl; external av__codec;
+
+function avcodec_parse_frame(avctx: PAVCodecContext; pdata: PPointer;
+                      data_size_ptr: PCint;
+                      buf: PByteArray; buf_size: cint): cint;
+  cdecl; external av__codec;
+
+(**
+ * Encode an audio frame from samples into buf.
+ *
+ * @note The output buffer should be at least FF_MIN_BUFFER_SIZE bytes large.
+ * However, for PCM audio the user will know how much space is needed
+ * because it depends on the value passed in buf_size as described
+ * below. In that case a lower value can be used.
+ *
+ * @param avctx the codec context
+ * @param[out] buf the output buffer
+ * @param[in] buf_size the output buffer size
+ * @param[in] samples the input buffer containing the samples
+ * The number of samples read from this buffer is frame_size*channels,
+ * both of which are defined in avctx.
+ * For PCM audio the number of samples read from samples is equal to
+ * buf_size * input_sample_size / output_sample_size.
+ * @return On error a negative value is returned, on success zero or the number
+ * of bytes used to encode the data read from the input buffer.
+ *)
+function avcodec_encode_audio(avctx: PAVCodecContext; buf: PByte;
+                      buf_size: cint; samples: {const} PSmallint): cint;
+  cdecl; external av__codec;
+
+(**
+ * Encode a video frame from pict into buf.
+ * The input picture should be
+ * stored using a specific format, namely avctx.pix_fmt.
+ *
+ * @param avctx the codec context
+ * @param[out] buf the output buffer for the bitstream of encoded frame
+ * @param[in] buf_size the size of the output buffer in bytes
+ * @param[in] pict the input picture to encode
+ * @return On error a negative value is returned, on success zero or the number
+ * of bytes used from the output buffer.
+ *)
+function avcodec_encode_video(avctx: PAVCodecContext; buf: PByte;
+                      buf_size: cint; pict: {const} PAVFrame): cint;
+  cdecl; external av__codec;
+function avcodec_encode_subtitle(avctx: PAVCodecContext; buf: PByteArray;
+                      buf_size: cint; sub: {const} PAVSubtitle): cint;
+  cdecl; external av__codec;
+
+function avcodec_close(avctx: PAVCodecContext): cint;
+  cdecl; external av__codec;
+
+(**
+ * Register all the codecs, parsers and bitstream filters which were enabled at
+ * configuration time. If you do not call this function you can select exactly
+ * which formats you want to support, by using the individual registration
+ * functions.
+ *
+ * @see register_avcodec
+ * @see avcodec_register
+ * @see av_register_codec_parser
+ * @see av_register_bitstream_filter
+ *)
+procedure avcodec_register_all();
+  cdecl; external av__codec;
+
+(**
+ * Flush buffers, should be called when seeking or when switching to a different stream.
+ *)
+procedure avcodec_flush_buffers(avctx: PAVCodecContext);
+  cdecl; external av__codec;
+  
+procedure avcodec_default_free_buffers(s: PAVCodecContext);
+  cdecl; external av__codec;
+
+(* misc useful functions *)
+
+{$IFDEF FF_API_OLD_FF_PICT_TYPES}
+(**
+ * Return a single letter to describe the given picture type pict_type.
+ *
+ * @param[in] pict_type the picture type
+ * @return A single character representing the picture type.
+ * @deprecated Use av_get_picture_type_char() instead.
+ *)
+function av_get_pict_type_char(pict_type: cint): AnsiChar;
+  cdecl; external av__codec; deprecated;
+{$ENDIF}
+
+(**
+ * Return codec bits per sample.
+ *
+ * @param[in] codec_id the codec
+ * @return Number of bits per sample or zero if unknown for the given codec.
+ *)
+function av_get_bits_per_sample(codec_id: TCodecID): cint;
+  cdecl; external av__codec;
+
+{$IFDEF FF_API_OLD_SAMPLE_FMT}
+(**
+ * @deprecated Use av_get_bits_per_sample_fmt() instead.
+ *)
+function av_get_bits_per_sample_format(sample_fmt: TAVSampleFormat): cint;
+  cdecl; external av__codec; deprecated;
+{$ENDIF}
+
+const
+  AV_PARSER_PTS_NB      = 4;
+  PARSER_FLAG_COMPLETE_FRAMES = $0001;
+  PARSER_FLAG_ONCE            = $0002;
+/// Set if the parser has a valid file offset
+  PARSER_FLAG_FETCHED_OFFSET  = $0004;
+
+type
+  (* frame parsing *)
+  PAVCodecParserContext = ^TAVCodecParserContext;
+  PAVCodecParser = ^TAVCodecParser;
+
+  TAVCodecParserContext = record
+    priv_data: pointer;
+    parser: PAVCodecParser;
+    frame_offset: cint64; (* offset of the current frame *)
+    cur_offset: cint64; (* current offset (incremented by each av_parser_parse()) *)
+    next_frame_offset: cint64; (* offset of the next frame *)
+    (* video info *)
+    pict_type: cint; (* XXX: put it back in AVCodecContext *)
+    (**
+     * This field is used for proper frame duration computation in lavf.
+     * It signals, how much longer the frame duration of the current frame
+     * is compared to normal frame duration.
+     *
+     * frame_duration = (1 + repeat_pict) * time_base
+     *
+     * It is used by codecs like H.264 to display telecined material.
+     *)
+    repeat_pict: cint; (* XXX: put it back in AVCodecContext *)
+    pts: cint64;     (* pts of the current frame *)
+    dts: cint64;     (* dts of the current frame *)
+
+    (* private data *)
+    last_pts: cint64;
+    last_dts: cint64;
+    fetch_timestamp: cint;
+
+    cur_frame_start_index: cint;
+    cur_frame_offset: array [0..AV_PARSER_PTS_NB - 1] of cint64;
+    cur_frame_pts: array [0..AV_PARSER_PTS_NB - 1] of cint64;
+    cur_frame_dts: array [0..AV_PARSER_PTS_NB - 1] of cint64;
+
+    flags: cint;
+
+    offset: cint64;      ///< byte offset from starting packet start
+    cur_frame_end: array [0..AV_PARSER_PTS_NB - 1] of cint64;
+
+    (*!
+     * Set by parser to 1 for key frames and 0 for non-key frames.
+     * It is initialized to -1, so if the parser doesn't set this flag,
+     * old-style fallback using FF_I_TYPE picture type as key frames
+     * will be used.
+     *)
+    key_frame: cint;
+
+    (**
+     * Time difference in stream time base units from the pts of this
+     * packet to the point at which the output from the decoder has converged
+     * independent from the availability of previous frames. That is, the
+     * frames are virtually identical no matter if decoding started from
+     * the very first frame or from this keyframe.
+     * Is AV_NOPTS_VALUE if unknown.
+     * This field has no meaning if the packet does not have AV_PKT_FLAG_KEY
+     * set.
+     *
+     * The purpose of this field is to allow seeking in streams that have no
+     * keyframes in the conventional sense. It corresponds to the
+     * recovery point SEI in H.264 and match_time_delta in NUT. It is also
+     * essential for some types of subtitle streams to ensure that all
+     * subtitles are correctly displayed after seeking.
+     *)
+    convergence_duration: cint64;
+
+    // Timestamp generation support:
+    (**
+     * Synchronization point for start of timestamp generation.
+     *
+     * Set to >0 for sync point, 0 for no sync point and <0 for undefined
+     * (default).
+     *
+     * For example, this corresponds to presence of H.264 buffering period
+     * SEI message.
+     *)
+    dts_sync_point: cint;
+
+    (**
+     * Offset of the current timestamp against last timestamp sync point in
+     * units of AVCodecContext.time_base.
+     *
+     * Set to INT_MIN when dts_sync_point unused. Otherwise, it must
+     * contain a valid timestamp offset.
+     *
+     * Note that the timestamp of sync point has usually a nonzero
+     * dts_ref_dts_delta, which refers to the previous sync point. Offset of
+     * the next frame after timestamp sync point will be usually 1.
+     *
+     * For example, this corresponds to H.264 cpb_removal_delay.
+     *)
+    dts_ref_dts_delta: cint;
+
+    (**
+     * Presentation delay of current frame in units of AVCodecContext.time_base.
+     *
+     * Set to INT_MIN when dts_sync_point unused. Otherwise, it must
+     * contain valid non-negative timestamp delta (presentation time of a frame
+     * must not lie in the past).
+     *
+     * This delay represents the difference between decoding and presentation
+     * time of the frame.
+     *
+     * For example, this corresponds to H.264 dpb_output_delay.
+     *)
+    pts_dts_delta: cint;
+
+    (**
+     * Position of the packet in file.
+     *
+     * Analogous to cur_frame_pts/dts
+     *)
+    cur_frame_pos: array [0..AV_PARSER_PTS_NB - 1] of cint64;
+
+    (**
+     * Byte position of currently parsed frame in stream.
+     *)
+    pos: cint64;
+
+    (**
+     * Previous frame byte position.
+     *)
+    last_pos: cint64;
+  end; {AVCodecParserContext}
+
+  TAVCodecParser = record
+    codec_ids: array [0..4] of cint; (* several codec IDs are permitted *)
+    priv_data_size: cint;
+    parser_init: function(s: PAVCodecParserContext): cint; cdecl;
+    parser_parse: function(s: PAVCodecParserContext;
+                           avctx: PAVCodecContext;
+                           poutbuf: {const} PPointer; poutbuf_size: PCint;
+                           buf: {const} PByteArray; buf_size: cint): cint; cdecl;
+    parser_close: procedure(s: PAVCodecParserContext); cdecl;
+    split: function(avctx: PAVCodecContext; buf: {const} PByteArray;
+                    buf_size: cint): cint; cdecl;
+    next: PAVCodecParser;
+  end; {AVCodecParser}
+
+function av_parser_next(c: PAVCodecParser): PAVCodecParser;
+  cdecl; external av__codec;
+
+procedure av_register_codec_parser(parser: PAVCodecParser);
+  cdecl; external av__codec;
+
+function av_parser_init(codec_id: cint): PAVCodecParserContext;
+  cdecl; external av__codec;
+
+{$IF LIBAVCODEC_MAX_VERSION_MAJOR < 53}
+function av_parser_parse(s: PAVCodecParserContext;
+                  avctx: PAVCodecContext;
+                  poutbuf: PPointer;
+                  poutbuf_size: PCint;
+                  buf: {const} PByteArray;
+                  buf_size: cint;
+                  pts: cint64;
+                  dts: cint64): cint;
+  cdecl; external av__codec; deprecated;
+{$IFEND}
+
+(**
+ * Parse a packet.
+ *
+ * @param s             parser context.
+ * @param avctx         codec context.
+ * @param poutbuf       set to pointer to parsed buffer or NULL if not yet finished.
+ * @param poutbuf_size  set to size of parsed buffer or zero if not yet finished.
+ * @param buf           input buffer.
+ * @param buf_size      input length, to signal EOF, this should be 0 (so that the last frame can be output).
+ * @param pts           input presentation timestamp.
+ * @param dts           input decoding timestamp.
+ * @param pos           input byte position in stream.
+ * @return the number of bytes of the input bitstream used.
+ *
+ * Example:
+ * @code
+ *   while (in_len) do
+ *   begin
+ *     len := av_parser_parse2(myparser, AVCodecContext, data, size,
+ *                                       in_data, in_len,
+ *                                       pts, dts, pos);
+ *      in_data := in_data + len;
+ *      in_len  := in_len  - len;
+ *
+ *      if (size) then
+ *        decode_frame(data, size);
+ *   end;
+ * @endcode
+ *)
+function av_parser_parse2(s:    PAVCodecParserContext;
+                  avctx:        PAVCodecContext;
+                  poutbuf:      PPointer;
+                  poutbuf_size: PCint;
+                  buf: {const}  PByteArray;
+                  buf_size:     cint;
+                  pts:          cint64;
+                  dts:          cint64;
+                  pos:          cint64): cint;
+   cdecl; external av__codec;
+
+function av_parser_change(s: PAVCodecParserContext;
+                   avctx: PAVCodecContext;
+                   poutbuf: PPointer; poutbuf_size: PCint;
+                   buf: {const} PByteArray; buf_size: cint; keyframe: cint): cint;
+  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: PAnsiChar;
+    priv_data_size: cint;
+    filter: function(bsfc: PAVBitStreamFilterContext;
+                  avctx: PAVCodecContext; args: {const} PAnsiChar;
+                  poutbuf: PPointer; poutbuf_size: PCint;
+                  buf: {const} PByte; buf_size: cint; keyframe: cint): cint; cdecl;
+    close: procedure(bsfc: PAVBitStreamFilterContext);
+    next: PAVBitStreamFilter;
+  end;
+
+procedure av_register_bitstream_filter(bsf: PAVBitStreamFilter);
+  cdecl; external av__codec;
+
+function av_bitstream_filter_init(name: {const} PAnsiChar): PAVBitStreamFilterContext;
+  cdecl; external av__codec;
+
+function av_bitstream_filter_filter(bsfc: PAVBitStreamFilterContext;
+                               avctx: PAVCodecContext; args: {const} PAnsiChar;
+                               poutbuf: PPointer; poutbuf_size: PCint;
+                               buf: {const} PByte; buf_size: cint; keyframe: cint): cint;
+  cdecl; external av__codec;
+
+procedure av_bitstream_filter_close(bsf: PAVBitStreamFilterContext);
+  cdecl; external av__codec;
+
+function av_bitstream_filter_next(f: PAVBitStreamFilter): PAVBitStreamFilter;
+  cdecl; external av__codec;
+
+(* memory *)
+
+(**
+ * Reallocate the given block if it is not large enough, otherwise do nothing.
+ *
+ * @see av_realloc
+ *)
+procedure av_fast_realloc(ptr: pointer; size: PCuint; min_size: FF_INTERNALC_MEM_TYPE);
+  cdecl; external av__codec;
+
+(**
+ * Allocate a buffer, reusing the given one if large enough.
+ *
+ * Contrary to av_fast_realloc the current buffer contents might not be
+ * preserved and on error the old buffer is freed, thus no special
+ * handling to avoid memleaks is necessary.
+ *
+ * @param ptr pointer to pointer to already allocated buffer, overwritten with pointer to new buffer
+ * @param size size of the buffer *ptr points to
+ * @param min_size minimum size of *ptr buffer after returning, *ptr will be NULL and
+ *                 *size 0 if an error occurred.
+ *)
+procedure av_fast_malloc(ptr: pointer; size: PCuint; min_size: FF_INTERNALC_MEM_TYPE);
+  cdecl; external av__codec;
+
+{$IF LIBAVCODEC_MAX_VERSION_MAJOR < 53}
+(**
+ * @deprecated Deprecated in favor of av_image_copy().
+ *)
+type
+  PQuaduint8Array = ^TQuaduint8Array;
+  TQuaduint8Array = array [0..3] of cuint8;
+
+procedure av_picture_data_copy(dst_data: PQuaduint8Array; dst_linesize: TQuadIntArray;
+                               src_data: PQuaduint8Array; src_linesize: TQuadIntArray;
+                               pix_fmt:  TAVPixelFormat;  width: cint; height: cint);
+  cdecl; external av__codec; deprecated;
+{$IFEND}
+
+(**
+ * Copy image src to dst. Wraps av_picture_data_copy() above.
+ *)
+procedure av_picture_copy(dst: PAVPicture; 
+              src: {const} PAVPicture;
+              pix_fmt: TAVPixelFormat;
+              width:  cint;
+              height: cint);
+  cdecl; external av__codec;
+
+(**
+ * Crop image top and left side.
+ *)
+function av_picture_crop(dst: PAVPicture;
+              src: {const} PAVPicture;
+              pix_fmt: TAVPixelFormat;
+              top_band: cint;
+              left_band: cint): cint;
+  cdecl; external av__codec;
+
+(**
+ * Pad image.
+ *)
+function av_picture_pad(dst: PAVPicture;
+            src: {const} PAVPicture;
+            height: cint;
+            width: cint;
+            pix_fmt: TAVPixelFormat;
+            padtop: cint;
+            padbottom: cint;
+            padleft: cint;
+            padright:
+            cint;
+            color: PCint): cint;
+  cdecl; external av__codec;
+
+(**
+ * Encode extradata length to a buffer. Used by xiph codecs.
+ *
+ * @param s buffer to write to; must be at least (v/255+1) bytes long
+ * @param v size of extradata in bytes
+ * @return number of bytes written to the buffer.
+ *)
+function av_xiphlacing(s: PByte; v: cuint): cuint;
+  cdecl; external av__codec;
+
+{$IF LIBAVCODEC_VERSION_MAJOR < 53}
+(**
+ * Parse str and put in width_ptr and height_ptr the detected values.
+ *
+ * @deprecated Deprecated in favor of av_parse_video_size().
+ *)
+function av_parse_video_frame_size(width_ptr: PCint; height_ptr: PCint; str: {const} PAnsiChar): cint;
+  cdecl; external av__codec; deprecated;
+
+(**
+ * Parse str and store the detected values in *frame_rate.
+ *
+ * @deprecated Deprecated in favor of av_parse_video_rate().
+ *)
+function av_parse_video_frame_rate(frame_rate: PAVRational; str: {const} PAnsiChar): cint;
+  cdecl; external av__codec; deprecated;
+{$IFEND}
+
+(**
+ * Log a generic warning message about a missing feature. This function is
+ * intended to be used internally by FFmpeg (libavcodec, libavformat, etc.)
+ * only, and would normally not be used by applications.
+ * @param[in] avc a pointer to an arbitrary struct of which the first field is
+ * a pointer to an AVClass struct
+ * @param[in] feature string containing the name of the missing feature
+ * @param[in] want_sample indicates if samples are wanted which exhibit this feature.
+ * If want_sample is non-zero, additional verbage will be added to the log
+ * message which tells the user how to report samples to the development
+ * mailing list.
+ *)
+procedure av_log_missing_feature(avc: Pointer; feature: {const} PAnsiChar; want_sample: cint);
+  cdecl; external av__codec;
+
+(**
+ * Log a generic warning message asking for a sample. This function is
+ * intended to be used internally by FFmpeg (libavcodec, libavformat, etc.)
+ * only, and would normally not be used by applications.
+ * @param[in] avc a pointer to an arbitrary struct of which the first field is
+ * a pointer to an AVClass struct
+ * @param[in] msg string containing an optional message, or NULL if no message
+ *)
+procedure av_log_ask_for_sample(avc: Pointer; msg: {const} PAnsiChar);
+  cdecl; external av__codec;
+
+(**
+ * Register the hardware accelerator hwaccel.
+ *)
+procedure av_register_hwaccel (hwaccel: PAVHWAccel)
+  cdecl; external av__codec;
+
+(**
+ * If hwaccel is NULL, returns the first registered hardware accelerator,
+ * if hwaccel is non-NULL, returns the next registered hardware accelerator
+ * after hwaccel, or NULL if hwaccel is the last one.
+ *)
+function av_hwaccel_next (hwaccel: PAVHWAccel): PAVHWAccel;
+  cdecl; external av__codec;
+
+(**
+ * Lock operation used by lockmgr
+ *)
+type
+  TAVLockOp = (
+    AV_LOCK_CREATE,  ///< Create a mutex
+    AV_LOCK_OBTAIN,  ///< Lock the mutex
+    AV_LOCK_RELEASE, ///< Unlock the mutex
+    AV_LOCK_DESTROY  ///< Free mutex resources
+  );
+
+(**
+ * Register a user provided lock manager supporting the operations
+ * specified by AVLockOp. mutex points to a (void) where the
+ * lockmgr should store/get a pointer to a user allocated mutex. It's
+ * NULL upon AV_LOCK_CREATE and != NULL for all other ops.
+ *
+ * @param cb User defined callback. Note: FFmpeg may invoke calls to this
+ *           callback during the call to av_lockmgr_register().
+ *           Thus, the application must be prepared to handle that.
+ *           If cb is set to NULL the lockmgr will be unregistered.
+ *           Also note that during unregistration the previously registered
+ *           lockmgr callback may also be invoked.
+ *)
+// ToDo: Implement and test this
+//function av_lockmgr_register(cb: function (mutex: Ppointer; op: TAVLockOp)): cint;
+//  cdecl; external av__codec;
+
+implementation
+
+end.
diff --git a/src/lib/ffmpeg7/samplefmt.pas b/src/lib/ffmpeg7/samplefmt.pas
new file mode 100644
index 00000000..8b0c7c15
--- /dev/null
+++ b/src/lib/ffmpeg7/samplefmt.pas
@@ -0,0 +1,158 @@
+(*
+ * SampleFormat
+ * copyright (c) 2011 Karl-Michael Schindler <karl-michael.schindler@web.de>
+ *
+ * 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 Street, Fifth Floor, Boston, MA 02110-1301 USA
+ *
+ * This is a part of the Pascal port of ffmpeg.
+ *
+ * Conversion of libavutil/samplefmt.h
+ * avutil version 50.43.0
+ *
+ *)
+
+unit samplefmt;
+
+{$IFDEF FPC}
+  {$MODE DELPHI}
+  {$PACKENUM 4}    (* use 4-byte enums *)
+  {$PACKRECORDS C} (* C/C++-compatible record packing *)
+{$ELSE}
+  {$MINENUMSIZE 4} (* use 4-byte enums *)
+{$ENDIF}
+
+{$IFNDEF AVUTIL_SAMPLEFMT_H}
+  {$DEFINE AVUTIL_SAMPLEFMT_H}
+{$ENDIF}
+
+interface
+
+uses
+  ctypes,
+  UConfig;
+
+type
+(**
+ * all in native-endian format
+ *)
+  TAVSampleFormat = (
+    AV_SAMPLE_FMT_NONE = -1,
+    AV_SAMPLE_FMT_U8,          ///< unsigned 8 bits
+    AV_SAMPLE_FMT_S16,         ///< signed 16 bits
+    AV_SAMPLE_FMT_S32,         ///< signed 32 bits
+    AV_SAMPLE_FMT_FLT,         ///< float
+    AV_SAMPLE_FMT_DBL,         ///< double
+    AV_SAMPLE_FMT_NB           ///< Number of sample formats. DO NOT USE if linking dynamically
+  );
+  TAVSampleFormatArray = array [0 .. MaxInt div SizeOf(TAVSampleFormat) - 1] of TAVSampleFormat;
+  PAVSampleFormatArray = ^TAVSampleFormatArray;
+
+(**
+ * Return the name of sample_fmt, or NULL if sample_fmt is not
+ * recognized.
+ *)
+function av_get_sample_fmt_name(sample_fmt: TAVSampleFormat): {const} PAnsiChar;
+  cdecl; external av__util;
+
+(**
+ * Return a sample format corresponding to name, or AV_SAMPLE_FMT_NONE
+ * on error.
+ *)
+function av_get_sample_fmt(name: {const} PAnsiChar): TAVSampleFormat;
+  cdecl; external av__util;
+
+(**
+ * Generate a string corresponding to the sample format with
+ * sample_fmt, or a header if sample_fmt is negative.
+ *
+ * @param buf the buffer where to write the string
+ * @param buf_size the size of buf
+ * @param sample_fmt the number of the sample format to print the
+ * corresponding info string, or a negative value to print the
+ * corresponding header.
+ * @return the pointer to the filled buffer or NULL if sample_fmt is
+ * unknown or in case of other errors
+ *)
+function av_get_sample_fmt_string(buf: PAnsiChar; buf_size: cint; sample_fmt: TAVSampleFormat): PAnsiChar;
+  cdecl; external av__util;
+
+{$IF FF_API_GET_BITS_PER_SAMPLE_FMT}
+(**
+ * @deprecated Use av_get_bytes_per_sample() instead.
+ *)
+function av_get_bits_per_sample_fmt(sample_fmt: TAVSampleFormat): cint; deprecated;
+  cdecl; external av__util;
+{$ENDIF}
+
+(**
+ * Return number of bytes per sample.
+ *
+ * @param sample_fmt the sample format
+ * @return number of bytes per sample or zero if unknown for the given
+ * sample format
+ *)
+function av_get_bytes_per_sample(sample_fmt: TAVSampleFormat): cint;
+  cdecl; external av__util;
+
+(**
+ * Fill channel data pointers and linesizes for samples with sample
+ * format sample_fmt.
+ *
+ * The pointers array is filled with the pointers to the samples data:
+ * for planar, set the start point of each plane's data within the buffer,
+ * for packed, set the start point of the entire buffer only.
+ *
+ * The linesize array is filled with the aligned size of each samples
+ * plane, that is linesize[i] will contain the linesize of the plane i,
+ * and will be zero for all the unused planes. All linesize values are
+ * equal.
+ *
+ * @param pointers array to be filled with the pointer for each plane, may be NULL
+ * @param linesizes array to be filled with the linesize, may be NULL
+ * @param buf the pointer to a buffer containing the samples
+ * @param nb_samples the number of samples in a single channel
+ * @param planar 1 if the samples layout is planar, 0 if it is packed
+ * @param nb_channels the number of channels
+ * @return the total size of the buffer, a negative
+ * error code in case of failure
+ *)
+function av_samples_fill_arrays(pointers: array[0..7] of Pcuint8; linesizes: array[0..7] of cint;
+                                buf: Pcuint8; nb_channels: cint; nb_samples: cint; 
+                                sample_fmt: TAVSampleFormat; planar: cint; align: cint): cint;
+  cdecl; external av__util;
+
+(**
+ * Allocate a samples buffer for nb_samples samples, and
+ * fill pointers and linesizes accordingly.
+ * The allocated samples buffer has to be freed by using
+ * av_freep(&pointers[0]).
+ *
+ * @param nb_channels number of audio channels
+ * @param nb_samples number of samples per channel
+ * @param planar 1 if the samples layout is planar, 0 if packed,
+ * @param align the value to use for buffer size alignment
+ * @return the size in bytes required for the samples buffer, a negative
+ * error code in case of failure
+ * @see av_samples_fill_arrays()
+ *)
+function av_samples_alloc(pointers: array[0..7] of Pcuint8; linesizes: array[0..7] of cint;
+                          nb_channels: cint; nb_samples: cint;
+			  sample_fmt: TAVSampleFormat; planar: cint;
+			  align: cint): cint;
+  cdecl; external av__util;
+
+implementation
+
+end.