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(**
* 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; outval: Pcuint8): cint;
cdecl; external av__util;
function av_opt_get_int (obj: pointer; name: {const} PAnsiChar; search_flags: cint; outval: Pcint64): cint;
cdecl; external av__util;
function av_opt_get_double(obj: pointer; name: {const} PAnsiChar; search_flags: cint; outval: Pcdouble): cint;
cdecl; external av__util;
function av_opt_get_q (obj: pointer; name: {const} PAnsiChar; search_flags: cint; outval: 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;
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