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-(*
- * 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 50.43.0
- *
- *)
-
-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 *)
-{$ENDIF}
-
-interface
-
-uses
- ctypes,
- dict,
- rational,
- UConfig;
-
-type
- TAVOptionType = (
- FF_OPT_TYPE_FLAGS,
- FF_OPT_TYPE_INT,
- FF_OPT_TYPE_INT64,
- FF_OPT_TYPE_DOUBLE,
- FF_OPT_TYPE_FLOAT,
- FF_OPT_TYPE_STRING,
- FF_OPT_TYPE_RATIONAL,
- FF_OPT_TYPE_BINARY, ///< offset must point to a pointer immediately followed by an int for the length
- FF_OPT_TYPE_CONST = 128
- );
-
-const
- AV_OPT_FLAG_ENCODING_PARAM = 1; ///< a generic parameter which can be set by the user for muxing or encoding
- AV_OPT_FLAG_DECODING_PARAM = 2; ///< a generic parameter which can be set by the user for demuxing or decoding
- AV_OPT_FLAG_METADATA = 4; ///< some data extracted or inserted into the file like title, comment, ...
- AV_OPT_FLAG_AUDIO_PARAM = 8;
- AV_OPT_FLAG_VIDEO_PARAM = 16;
- AV_OPT_FLAG_SUBTITLE_PARAM = 32;
-
-type
- (**
- * AVOption
- *)
- PAVOption = ^TAVOption;
- TAVOption = record
- name: {const} PAnsiChar;
-
- (**
- * short English help text
- * @todo What about other languages?
- *)
- help: {const} PAnsiChar;
-
- (**
- * The offset relative to the context structure where the option
- * value is stored. It should be 0 for named constants.
- *)
- offset: cint;
- type_: TAVOptionType;
-
- (**
- * the default value for scalar options
- *)
- default_val: record
- case cint of
- 0: (dbl: cdouble);
- 1: (str: PAnsiChar);
- (* TODO those are unused now *)
- 2: (i64: cint64);
- 3: (q: TAVRational);
- end;
- min: cdouble; ///< minimum valid value for the option
- max: cdouble; ///< maximum valid value for the option
-
- flags: cint;
-//FIXME think about enc-audio, ... style flags
-
- (**
- * The logical unit to which the option belongs. Non-constant
- * options and corresponding named constants share the same
- * unit. May be NULL.
- *)
- unit_: {const} PAnsiChar;
- end;
-
-{$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;
-
-function av_set_double(obj: pointer; name: {const} PAnsiChar; n: cdouble): PAVOption;
- cdecl; external av__util;
-function av_set_q(obj: pointer; name: {const} PAnsiChar; n: TAVRational): PAVOption;
- cdecl; external av__util;
-function av_set_int(obj: pointer; name: {const} PAnsiChar; n: cint64): PAVOption;
- cdecl; external av__util;
-function av_get_double(obj: pointer; name: {const} PAnsiChar; var o_out: {const} PAVOption): cdouble;
- cdecl; external av__util;
-function av_get_q(obj: pointer; name: {const} PAnsiChar; var o_out: {const} PAVOption): TAVRational;
- cdecl; external av__util;
-function av_get_int(obj: pointer; name: {const} PAnsiChar; var o_out: {const} PAVOption): cint64;
- cdecl; external av__util;
-function av_get_string(obj: pointer; name: {const} PAnsiChar; var o_out: {const} PAVOption; buf: PAnsiChar; buf_len: cint): PAnsiChar;
- cdecl; external av__util;
-function av_next_option(obj: pointer; last: {const} PAVOption): PAVOption;
- cdecl; external av__util;
-
-(**
- * 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;
-
-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;
-
-(**
- * 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;
-
-const
- AV_OPT_SEARCH_CHILDREN = 0001; (**< Search in possible children of the
- given object first.*)
-
-(**
- * 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;
-
-implementation
-
-end.