(*
* 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.
* - Changes and updates by the UltraStar Deluxe Team
*)
(*
* Conversion of libavcodec/opt.h
* revision 16912, Sun Feb 1 02:00:19 2009 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 *)
{$ENDIF}
interface
uses
ctypes,
rational,
UConfig;
type
TAVOptionType = (
FF_OPT_TYPE_FLAGS,
FF_OPT_TYPE_INT,
FF_OPT_TYPE_INT64,
FF_OPT_TYPE_DOUBLE,
FF_OPT_TYPE_FLOAT,
FF_OPT_TYPE_STRING,
FF_OPT_TYPE_RATIONAL,
FF_OPT_TYPE_BINARY, ///< offset must point to a pointer immediately followed by an int for the length
FF_OPT_TYPE_CONST = 128
);
const
AV_OPT_FLAG_ENCODING_PARAM = 1; ///< a generic parameter which can be set by the user for muxing or encoding
AV_OPT_FLAG_DECODING_PARAM = 2; ///< a generic parameter which can be set by the user for demuxing or decoding
AV_OPT_FLAG_METADATA = 4; ///< some data extracted or inserted into the file like title, comment, ...
AV_OPT_FLAG_AUDIO_PARAM = 8;
AV_OPT_FLAG_VIDEO_PARAM = 16;
AV_OPT_FLAG_SUBTITLE_PARAM = 32;
type
(**
* AVOption
*)
PAVOption = ^TAVOption;
TAVOption = record
name: {const} PAnsiChar;
(**
* short English help text
* @todo What about other languages?
*)
help: {const} PAnsiChar;
(**
* The offset relative to the context structure where the option
* value is stored. It should be 0 for named constants.
*)
offset: cint;
type_: TAVOptionType;
(**
* the default value for scalar options
*)
default_val: cdouble;
min: cdouble; ///< minimum valid value for the option
max: cdouble; ///< maximum valid value for the option
flags: cint;
//FIXME think about enc-audio, ... style flags
(**
* The logical unit to which the option belongs. Non-constant
* options and corresponding named constants share the same
* unit. May be NULL.
*)
unit_: {const} PAnsiChar;
end;
{$IF LIBAVCODEC_VERSION >= 51039000} // 51.39.0
(**
* Looks for an option in \p obj. Looks only for the options which
* have the flags set as specified in \p mask and \p flags (that is,
* for which it is the case that opt->flags & mask == flags).
*
* @param[in] obj a pointer to a struct whose first element is a
* pointer to an AVClass
* @param[in] name the name of the option to look for
* @param[in] unit the unit of the option to look for, or any if NULL
* @return a pointer to the option found, or NULL if no option
* has been found
*)
function av_find_opt(obj: Pointer; {const} name: {const} PAnsiChar; {const} unit_: PAnsiChar; mask: cint; flags: cint): {const} PAVOption;
cdecl; external av__codec;
{$IFEND}
{$IF LIBAVCODEC_VERSION_MAJOR < 53}
(**
* @see av_set_string2()
*)
function av_set_string(obj: pointer; name: {const} PAnsiChar; val: {const} PAnsiChar): {const} PAVOption;
cdecl; external av__codec; deprecated;
{$IF LIBAVCODEC_VERSION >= 51059000} // 51.59.0
(**
* @return a pointer to the AVOption corresponding to the field set or
* NULL if no matching AVOption exists, or if the value \p val is not
* valid
* @see av_set_string3()
*)
function av_set_string2(obj: Pointer; name: {const} PAnsiChar; val: {const} PAnsiChar; alloc: cint): {const} PAVOption;
cdecl; external av__codec; deprecated;
{$IFEND}
{$IFEND}
{$IF LIBAVCODEC_VERSION >= 52007000} // 52.7.0
(**
* Sets the field of obj with the given name to value.
*
* @param[in] obj A struct whose first element is a pointer to an
* AVClass.
* @param[in] name the name of the field to set
* @param[in] val The value to set. If the field is not of a string
* type, then the given string is parsed.
* SI postfixes and some named scalars are supported.
* If the field is of a numeric type, it has to be a numeric or named
* scalar. Behavior with more than one scalar and +- infix operators
* is undefined.
* If the field is of a flags type, it has to be a sequence of numeric
* scalars or named flags separated by '+' or '-'. Prefixing a flag
* with '+' causes it to be set without affecting the other flags;
* similarly, '-' unsets a flag.
* @param[out] o_out if non-NULL put here a pointer to the AVOption
* found
* @param alloc when 1 then the old value will be av_freed() and the
* new av_strduped()
* when 0 then no av_free() nor av_strdup() will be used
* @return 0 if the value has been set, an AVERROR* error code if no
* matching option exists, or if the value \p val is not valid
*)
function av_set_string3(obj: Pointer; name: {const} PAnsiChar; val: {const} PAnsiChar; alloc: cint; out o_out: {const} PAVOption): cint;
cdecl; external av__codec;
{$IFEND}
function av_set_double(obj: pointer; name: {const} PAnsiChar; n: cdouble): PAVOption;
cdecl; external av__codec;
function av_set_q(obj: pointer; name: {const} PAnsiChar; n: TAVRational): PAVOption;
cdecl; external av__codec;
function av_set_int(obj: pointer; name: {const} PAnsiChar; n: cint64): PAVOption;
cdecl; external av__codec;
function av_get_double(obj: pointer; name: {const} PAnsiChar; var o_out: PAVOption): cdouble;
cdecl; external av__codec;
function av_get_q(obj: pointer; name: {const} PAnsiChar; var o_out: PAVOption): TAVRational;
cdecl; external av__codec;
function av_get_int(obj: pointer; name: {const} PAnsiChar; var o_out: {const} PAVOption): cint64;
cdecl; external av__codec;
function av_get_string(obj: pointer; name: {const} PAnsiChar; var o_out: {const} PAVOption; buf: PAnsiChar; buf_len: cint): PAnsiChar;
cdecl; external av__codec;
function av_next_option(obj: pointer; last: {const} PAVOption): PAVOption;
cdecl; external av__codec;
function av_opt_show(obj: pointer; av_log_obj: pointer): cint;
cdecl; external av__codec;
procedure av_opt_set_defaults(s: pointer);
cdecl; external av__codec;
{$IF LIBAVCODEC_VERSION >= 51039000} // 51.39.0
procedure av_opt_set_defaults2(s: Pointer; mask: cint; flags: cint);
cdecl; external av__codec;
{$IFEND}
implementation
end.
