(*
* 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 libavutil/opt.h
* avutil version 51.54.100
*
*)
type
TAVOptionType = (
{$IFDEF FF_API_OLD_AVOPTIONS}
FF_OPT_TYPE_FLAGS = 0,
FF_OPT_TYPE_INT,
FF_OPT_TYPE_INT64,
FF_OPT_TYPE_DOUBLE,
FF_OPT_TYPE_FLOAT,
FF_OPT_TYPE_STRING,
FF_OPT_TYPE_RATIONAL,
FF_OPT_TYPE_BINARY, ///< offset must point to a pointer immediately followed by an int for the length
FF_OPT_TYPE_CONST = 128
{$ELSE}
AV_OPT_TYPE_FLAGS,
AV_OPT_TYPE_INT,
AV_OPT_TYPE_INT64,
AV_OPT_TYPE_DOUBLE,
AV_OPT_TYPE_FLOAT,
AV_OPT_TYPE_STRING,
AV_OPT_TYPE_RATIONAL,
AV_OPT_TYPE_BINARY, ///< offset must point to a pointer immediately followed by an int for the length
AV_OPT_TYPE_CONST = 128
{$ENDIF}
);
const
AV_OPT_FLAG_ENCODING_PARAM = 1; ///< a generic parameter which can be set by the user for muxing or encoding
AV_OPT_FLAG_DECODING_PARAM = 2; ///< a generic parameter which can be set by the user for demuxing or decoding
AV_OPT_FLAG_METADATA = 4; ///< some data extracted or inserted into the file like title, comment, ...
AV_OPT_FLAG_AUDIO_PARAM = 8;
AV_OPT_FLAG_VIDEO_PARAM = 16;
AV_OPT_FLAG_SUBTITLE_PARAM = 32;
type
(**
* AVOption
*)
PAVOption = ^TAVOption;
TAVOption = record
name: {const} PAnsiChar;
(**
* short English help text
* @todo What about other languages?
*)
help: {const} PAnsiChar;
(**
* The offset relative to the context structure where the option
* value is stored. It should be 0 for named constants.
*)
offset: cint;
type_: TAVOptionType;
(**
* the default value for scalar options
*)
default_val: record
case cint of
0: (dbl: cdouble);
1: (str: PAnsiChar);
(* TODO those are unused now *)
2: (i64: cint64);
3: (q: TAVRational);
end;
min: cdouble; ///< minimum valid value for the option
max: cdouble; ///< maximum valid value for the option
flags: cint;
//FIXME think about enc-audio, ... style flags
(**
* The logical unit to which the option belongs. Non-constant
* options and corresponding named constants share the same
* unit. May be NULL.
*)
unit_: {const} PAnsiChar;
end;
{$IFDEF FF_API_FIND_OPT}
(**
* Look for an option in obj. Look only for the options which
* have the flags set as specified in mask and 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__util; deprecated;
{$ENDIF}
(**
* Set 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, or an AVERROR code in case of
* error:
* AVERROR(ENOENT) if no matching option exists
* AVERROR(ERANGE) if the value is out of range
* AVERROR(EINVAL) if the value 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__util; deprecated;
function av_set_double(obj: pointer; name: {const} PAnsiChar; n: cdouble): PAVOption;
cdecl; external av__util; deprecated;
function av_set_q (obj: pointer; name: {const} PAnsiChar; n: TAVRational): PAVOption;
cdecl; external av__util; deprecated;
function av_set_int (obj: pointer; name: {const} PAnsiChar; n: cint64): PAVOption;
cdecl; external av__util; deprecated;
function av_get_double(obj: pointer; name: {const} PAnsiChar; out o_out: {const} PAVOption): cdouble;
cdecl; external av__util;
function av_get_q (obj: pointer; name: {const} PAnsiChar; out o_out: {const} PAVOption): TAVRational;
cdecl; external av__util;
function av_get_int (obj: pointer; name: {const} PAnsiChar; out o_out: {const} PAVOption): cint64;
cdecl; external av__util;
function av_get_string(obj: pointer; name: {const} PAnsiChar; out o_out: {const} PAVOption; buf: PAnsiChar; buf_len: cint): PAnsiChar;
cdecl; external av__util; deprecated;
function av_next_option(obj: pointer; last: {const} PAVOption): PAVOption;
cdecl; external av__util; deprecated;
(**
* Show the obj options.
*
* @param req_flags requested flags for the options to show. Show only the
* options for which it is opt->flags & req_flags.
* @param rej_flags rejected flags for the options to show. Show only the
* options for which it is !(opt->flags & req_flags).
* @param av_log_obj log context to use for showing the options
*)
function av_opt_show2(obj: pointer; av_log_obj: pointer; req_flags: cint; rej_flags: cint): cint;
cdecl; external av__util;
(**
* Set the values of all AVOption fields to their default values.
*
* @param s an AVOption-enabled struct (its first member must be a pointer to AVClass)
*)
procedure av_opt_set_defaults(s: pointer);
cdecl; external av__util;
procedure av_opt_set_defaults2(s: Pointer; mask: cint; flags: cint);
cdecl; external av__util; deprecated;
(**
* Parse the key/value pairs list in opts. For each key/value pair
* found, stores the value in the field in ctx that is named like the
* key. ctx must be an AVClass context, storing is done using
* AVOptions.
*
* @param opts options string to parse, may be NULL
* @param key_val_sep a 0-terminated list of characters used to
* separate key from value
* @param pairs_sep a 0-terminated list of characters used to separate
* two pairs from each other
* @return the number of successfully set key/value pairs, or a negative
* value corresponding to an AVERROR code in case of error:
* AVERROR(EINVAL) if opts cannot be parsed,
* the error code issued by av_set_string3() if a key/value pair
* cannot be set
*)
function av_set_options_string(ctx: pointer; opts: {const} PAnsiChar;
key_val_sep: {const} PAnsiChar; pairs_sep: {const} PAnsiChar): cint;
cdecl; external av__util;
(**
* Free all string and binary options in obj.
*)
procedure av_opt_free(obj: pointer);
cdecl; external av__util;
(**
* Check whether a particular flag is set in a flags field.
*
* @param field_name the name of the flag field option
* @param flag_name the name of the flag to check
* @return non-zero if the flag is set, zero if the flag isn't set,
* isn't of the right type, or the flags field doesn't exist.
*)
function av_opt_flag_is_set(obj: pointer; field_name: {const} PAnsiChar; flag_name: {const} PAnsiChar): cint;
cdecl; external av__util;
(**
* Set all the options from a given dictionary on an object.
*
* @param obj a struct whose first element is a pointer to AVClass
* @param options options to process. This dictionary will be freed and replaced
* by a new one containing all options not found in obj.
* Of course this new dictionary needs to be freed by caller
* with av_dict_free().
*
* @return 0 on success, a negative AVERROR if some option was found in obj,
* but could not be set.
*
* @see av_dict_copy()
*)
function av_opt_set_dict(obj: pointer; var options: PAVDictionary): cint;
cdecl; external av__util;
(**
* @defgroup opt_eval_funcs Evaluating option strings
* @{
* This group of functions can be used to evaluate option strings
* and get numbers out of them. They do the same thing as av_opt_set(),
* except the result is written into the caller-supplied pointer.
*
* @param obj a struct whose first element is a pointer to AVClass.
* @param o an option for which the string is to be evaluated.
* @param val string to be evaluated.
* @param *_out value of the string will be written here.
*
* @return 0 on success, a negative number on failure.
*)
function av_opt_eval_flags (obj: pointer; o: {const} PAVOption; val: {const} PAnsiChar; flags_out: Pcint): cint;
function av_opt_eval_int (obj: pointer; o: {const} PAVOption; val: {const} PAnsiChar; int_out: Pcint): cint;
function av_opt_eval_int64 (obj: pointer; o: {const} PAVOption; val: {const} PAnsiChar; int64_out: Pcint64): cint;
function av_opt_eval_float (obj: pointer; o: {const} PAVOption; val: {const} PAnsiChar; float_out: Pcfloat): cint;
function av_opt_eval_double(obj: pointer; o: {const} PAVOption; val: {const} PAnsiChar; double_out: Pcdouble): cint;
function av_opt_eval_q (obj: pointer; o: {const} PAVOption; val: {const} PAnsiChar; q_out: PAVRational): cint;
(**
* @}
*)
const
AV_OPT_SEARCH_CHILDREN = 0001; (**< Search in possible children of the
given object first.*)
(**
* The obj passed to av_opt_find() is fake -- only a double pointer to AVClass
* instead of a required pointer to a struct containing AVClass. This is
* useful for searching for options without needing to allocate the corresponding
* object.
*)
AV_OPT_SEARCH_FAKE_OBJ = 0002;
(**
* Look for an option in an object. Consider only options which
* have all the specified flags set.
*
* @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 When searching for named constants, name of the unit
* it belongs to.
* @param opt_flags Find only options with all the specified flags set (AV_OPT_FLAG).
* @param search_flags A combination of AV_OPT_SEARCH_*.
*
* @return A pointer to the option found, or NULL if no option
* was found.
*
* @note Options found with AV_OPT_SEARCH_CHILDREN flag may not be settable
* directly with av_set_string3(). Use special calls which take an options
* AVDictionary (e.g. avformat_open_input()) to set options found with this
* flag.
*)
function av_opt_find(obj: pointer; name: {const} PAnsiChar; unit_: {const} PAnsiChar;
opt_flags: cint; search_flags: cint): PAVOption;
cdecl; external av__util;
(**
* Look for an option in an object. Consider only options which
* have all the specified flags set.
*
* @param[in] obj A pointer to a struct whose first element is a
* pointer to an AVClass.
* Alternatively a double pointer to an AVClass, if
* AV_OPT_SEARCH_FAKE_OBJ search flag is set.
* @param[in] name The name of the option to look for.
* @param[in] unit When searching for named constants, name of the unit
* it belongs to.
* @param opt_flags Find only options with all the specified flags set (AV_OPT_FLAG).
* @param search_flags A combination of AV_OPT_SEARCH_*.
* @param[out] target_obj if non-NULL, an object to which the option belongs will be
* written here. It may be different from obj if AV_OPT_SEARCH_CHILDREN is present
* in search_flags. This parameter is ignored if search_flags contain
* AV_OPT_SEARCH_FAKE_OBJ.
*
* @return A pointer to the option found, or NULL if no option
* was found.
*)
function av_opt_find2(obj: pointer; name: {const} PAnsiChar; unit_: {const} PAnsiChar;
opt_flags: cint; search_flags: cint; out target_obj: pointer): {const} PAVOption;
cdecl; external av__util;
(**
* Iterate over all AVOptions belonging to obj.
*
* @param obj an AVOptions-enabled struct or a double pointer to an
* AVClass describing it.
* @param prev result of the previous call to av_opt_next() on this object
* or NULL
* @return next AVOption or NULL
*)
function av_opt_next(obj: pointer; prev: {const} PAVOption): {const} PAVOption;
cdecl; external av__util;
(**
* Iterate over AVOptions-enabled children of obj.
*
* @param prev result of a previous call to this function or NULL
* @return next AVOptions-enabled child or NULL
*)
function av_opt_child_next(obj: pointer; prev: pointer): pointer;
cdecl; external av__util;
(**
* Iterate over potential AVOptions-enabled children of parent.
*
* @param prev result of a previous call to this function or NULL
* @return AVClass corresponding to next potential child or NULL
*)
function av_opt_child_class_next(parent: {const} PAVClass; prev: {const} PAVClass): {const} PAVClass;
cdecl; external av__util;
(**
* @defgroup opt_set_funcs Option setting functions
* @{
* Those functions set 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. In case of av_opt_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 search_flags flags passed to av_opt_find2. I.e. if AV_OPT_SEARCH_CHILDREN
* is passed here, then the option may be set on a child of obj.
*
* @return 0 if the value has been set, or an AVERROR code in case of
* error:
* AVERROR_OPTION_NOT_FOUND if no matching option exists
* AVERROR(ERANGE) if the value is out of range
* AVERROR(EINVAL) if the value is not valid
*)
function av_opt_set (obj: pointer; name: {const} PAnsiChar; val: {const} PAnsiChar; search_flags: cint): cint;
cdecl; external av__util;
function av_opt_set_int (obj: pointer; name: {const} PAnsiChar; val: cint64; search_flags: cint): cint;
cdecl; external av__util;
function av_opt_set_double(obj: pointer; name: {const} PAnsiChar; val: cdouble; search_flags: cint): cint;
cdecl; external av__util;
function av_opt_set_q (obj: pointer; name: {const} PAnsiChar; val: TAVRational; search_flags: cint): cint;
cdecl; external av__util;
(**
* @}
*)
(**
* @defgroup opt_get_funcs Option getting functions
* @{
* Those functions get a value of the option with the given name from an object.
*
* @param[in] obj a struct whose first element is a pointer to an AVClass.
* @param[in] name name of the option to get.
* @param[in] search_flags flags passed to av_opt_find2. I.e. if AV_OPT_SEARCH_CHILDREN
* is passed here, then the option may be found in a child of obj.
* @param[out] out_val value of the option will be written here
* @return 0 on success, a negative error code otherwise
*)
(**
* @note the returned string will av_malloc()ed and must be av_free()ed by the caller
*)
function av_opt_get (obj: pointer; name: {const} PAnsiChar; search_flags: cint; out out_val: Pcuint8): cint;
cdecl; external av__util;
function av_opt_get_int (obj: pointer; name: {const} PAnsiChar; search_flags: cint; out_val: Pcint64): cint;
cdecl; external av__util;
function av_opt_get_double(obj: pointer; name: {const} PAnsiChar; search_flags: cint; out_val: Pcdouble): cint;
cdecl; external av__util;
function av_opt_get_q (obj: pointer; name: {const} PAnsiChar; search_flags: cint; out_val: PAVRational): cint;
cdecl; external av__util;
(**
* @}
*)
(**
* Gets a pointer to the requested field in a struct.
* This function allows accessing a struct even when its fields are moved or
* renamed since the application making the access has been compiled,
*
* @returns a pointer to the field, it can be cast to the correct type and read
* or written to.
*)
function av_opt_ptr(avclass: {const} PAVClass; obj: pointer; name: {const} PAnsiChar): pointer;
cdecl; external av__util;
(**
* @}
*)
