(*
 * AVOptions
 * copyright (c) 2005 Michael Niedermayer <michaelni@gmx.at>
 *
 * 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 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 *)

(*
 * Revision: 11250, Mon Dec 17 17:41:24 2007 UTC
 *)

unit opt;

{$IFDEF FPC}
  {$MODE DELPHI}
  {$PACKENUM 4}    (* use 4-byte enums *)
  {$PACKRECORDS C} (* C/C++-compatible record packing *)
{$ELSE}
  {$MINENUMSIZE 4} (* use 4-byte enums *)
{$ENDIF}

interface

uses
  rational,
  UConfig;

type
  TAVOptionType = (
    FF_OPT_TYPE_FLAGS,
    FF_OPT_TYPE_INT,
    FF_OPT_TYPE_INT64,
    FF_OPT_TYPE_DOUBLE,
    FF_OPT_TYPE_FLOAT,
    FF_OPT_TYPE_STRING,
    FF_OPT_TYPE_RATIONAL,
    FF_OPT_TYPE_BINARY,  ///< offset must point to a pointer immediately followed by an int for the length
    FF_OPT_TYPE_CONST = 128
  );

const
  AV_OPT_FLAG_ENCODING_PARAM  = 1;   ///< a generic parameter which can be set by the user for muxing or encoding
  AV_OPT_FLAG_DECODING_PARAM  = 2;   ///< a generic parameter which can be set by the user for demuxing or decoding
  AV_OPT_FLAG_METADATA        = 4;   ///< some data extracted or inserted into the file like title, comment, ...
  AV_OPT_FLAG_AUDIO_PARAM     = 8;
  AV_OPT_FLAG_VIDEO_PARAM     = 16;
  AV_OPT_FLAG_SUBTITLE_PARAM  = 32;

type
  (**
   * AVOption.
   *)
  PAVOption = ^TAVOption;
  TAVOption = record
    name: pchar;
    
    (**
     * short English text help.
     * @todo what about other languages
     *)
    help: pchar;
    offset: integer;             ///< offset to context structure where the parsed value should be stored
    type_: TAVOptionType;

    default_val: double;
    min: double;
    max: double;

    flags: integer;
//FIXME think about enc-audio, ... style flags
    unit_: pchar;
  end;

{$IF LIBAVCODEC_VERSION >= 51039000} // 51.39.0
function av_find_opt (obj: Pointer; {const} name: PChar; {const} unit_: PChar; mask: integer; flags: integer): {const} PAVOption;
  cdecl; external av__codec;
{$IFEND}

function av_set_string (obj: pointer; name: pchar; val: pchar): PAVOption;
  cdecl; external av__codec;

function av_set_double (obj: pointer; name: pchar; n: double): PAVOption;
  cdecl; external av__codec;

function av_set_q (obj: pointer; name: pchar; n: TAVRational): PAVOption;
  cdecl; external av__codec;

function av_set_int (obj: pointer; name: pchar; n: int64): PAVOption;
  cdecl; external av__codec;

function av_get_double (obj: pointer; name: pchar; o_out: PPointer): double;
  cdecl; external av__codec;

function av_get_q (obj: pointer; name: pchar; o_out: PPointer): TAVRational;
  cdecl; external av__codec;

function av_get_int (obj: pointer; name: pchar; o_out: PPointer): int64;
  cdecl; external av__codec;

function av_get_string (obj: pointer; name: pchar; o_out: PPOinter; buf: pchar; buf_len: integer): pchar;
  cdecl; external av__codec;

function av_next_option (obj: pointer; last: PAVOption): PAVOption;
  cdecl; external av__codec;

function av_opt_show (obj: pointer; av_log_obj: pointer): integer;
  cdecl; external av__codec;

procedure av_opt_set_defaults (s: pointer);
  cdecl; external av__codec;

{$IF LIBAVCODEC_VERSION >= 51039000} // 51.39.0
procedure av_opt_set_defaults2 (s: Pointer; mask: integer; flags: integer);
  cdecl; external av__codec;
{$IFEND}

implementation

end.