mirror of https://git.ffmpeg.org/ffmpeg.git
244 lines
8.8 KiB
C
244 lines
8.8 KiB
C
/*
|
|
* AVOptions
|
|
* copyright (c) 2005 Michael Niedermayer <michaelni@gmx.at>
|
|
*
|
|
* This file is part of FFmpeg.
|
|
*
|
|
* FFmpeg 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 2.1 of the License, or (at your option) any later version.
|
|
*
|
|
* FFmpeg 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 FFmpeg; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*/
|
|
|
|
#ifndef AVUTIL_OPT_H
|
|
#define AVUTIL_OPT_H
|
|
|
|
/**
|
|
* @file
|
|
* AVOptions
|
|
*/
|
|
|
|
#include "rational.h"
|
|
#include "avutil.h"
|
|
#include "dict.h"
|
|
|
|
enum AVOptionType{
|
|
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,
|
|
};
|
|
|
|
/**
|
|
* AVOption
|
|
*/
|
|
typedef struct AVOption {
|
|
const char *name;
|
|
|
|
/**
|
|
* short English help text
|
|
* @todo What about other languages?
|
|
*/
|
|
const char *help;
|
|
|
|
/**
|
|
* The offset relative to the context structure where the option
|
|
* value is stored. It should be 0 for named constants.
|
|
*/
|
|
int offset;
|
|
enum AVOptionType type;
|
|
|
|
/**
|
|
* the default value for scalar options
|
|
*/
|
|
union {
|
|
double dbl;
|
|
const char *str;
|
|
/* TODO those are unused now */
|
|
int64_t i64;
|
|
AVRational q;
|
|
} default_val;
|
|
double min; ///< minimum valid value for the option
|
|
double max; ///< maximum valid value for the option
|
|
|
|
int flags;
|
|
#define AV_OPT_FLAG_ENCODING_PARAM 1 ///< a generic parameter which can be set by the user for muxing or encoding
|
|
#define AV_OPT_FLAG_DECODING_PARAM 2 ///< a generic parameter which can be set by the user for demuxing or decoding
|
|
#define AV_OPT_FLAG_METADATA 4 ///< some data extracted or inserted into the file like title, comment, ...
|
|
#define AV_OPT_FLAG_AUDIO_PARAM 8
|
|
#define AV_OPT_FLAG_VIDEO_PARAM 16
|
|
#define AV_OPT_FLAG_SUBTITLE_PARAM 32
|
|
//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.
|
|
*/
|
|
const char *unit;
|
|
} AVOption;
|
|
|
|
#if 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
|
|
*
|
|
* @deprecated use av_opt_find.
|
|
*/
|
|
attribute_deprecated
|
|
const AVOption *av_find_opt(void *obj, const char *name, const char *unit, int mask, int flags);
|
|
#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
|
|
*/
|
|
int av_set_string3(void *obj, const char *name, const char *val, int alloc, const AVOption **o_out);
|
|
|
|
const AVOption *av_set_double(void *obj, const char *name, double n);
|
|
const AVOption *av_set_q(void *obj, const char *name, AVRational n);
|
|
const AVOption *av_set_int(void *obj, const char *name, int64_t n);
|
|
double av_get_double(void *obj, const char *name, const AVOption **o_out);
|
|
AVRational av_get_q(void *obj, const char *name, const AVOption **o_out);
|
|
int64_t av_get_int(void *obj, const char *name, const AVOption **o_out);
|
|
const char *av_get_string(void *obj, const char *name, const AVOption **o_out, char *buf, int buf_len);
|
|
const AVOption *av_next_option(void *obj, const AVOption *last);
|
|
|
|
/**
|
|
* 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
|
|
*/
|
|
int av_opt_show2(void *obj, void *av_log_obj, int req_flags, int rej_flags);
|
|
|
|
void av_opt_set_defaults(void *s);
|
|
void av_opt_set_defaults2(void *s, int mask, int flags);
|
|
|
|
/**
|
|
* 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
|
|
*/
|
|
int av_set_options_string(void *ctx, const char *opts,
|
|
const char *key_val_sep, const char *pairs_sep);
|
|
|
|
/**
|
|
* Free all string and binary options in obj.
|
|
*/
|
|
void av_opt_free(void *obj);
|
|
|
|
/**
|
|
* 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.
|
|
*/
|
|
int av_opt_flag_is_set(void *obj, const char *field_name, const char *flag_name);
|
|
|
|
/*
|
|
* 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()
|
|
*/
|
|
int av_opt_set_dict(void *obj, struct AVDictionary **options);
|
|
|
|
#define AV_OPT_SEARCH_CHILDREN 0x0001 /**< 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.
|
|
*/
|
|
const AVOption *av_opt_find(void *obj, const char *name, const char *unit,
|
|
int opt_flags, int search_flags);
|
|
|
|
#endif /* AVUTIL_OPT_H */
|