(* * AVOptions * copyright (c) 2005 Michael Niedermayer * * 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, AV_OPT_TYPE_IMAGE_SIZE = $53495A45 ///< MKBETAG('S','I','Z','E'), offset must point to two consecutive integers {$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; (** * @} *)