libavutil/opt.c File Reference

AVOptions. More...

#include "avutil.h"
#include "avstring.h"
#include "opt.h"
#include "eval.h"
#include "dict.h"

Go to the source code of this file.

Functions

const AVOption * av_find_opt (void *v, const char *name, const char *unit, int mask, int flags)

Look for an option in obj.

const AVOption * av_next_option (void *obj, const AVOption *last)

static int av_set_number2 (void *obj, const char *name, double num, int den, int64_t intnum, const AVOption **o_out)

static const AVOption * av_set_number (void *obj, const char *name, double num, int den, int64_t intnum)

static int hexchar2int (char c)

int av_set_string3 (void *obj, const char *name, const char *val, int alloc, const AVOption **o_out)

Set the field of obj with the given name to value.

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)

const char * av_get_string (void *obj, const char *name, const AVOption **o_out, char *buf, int buf_len)

static int av_get_number (void *obj, const char *name, const AVOption **o_out, double *num, int *den, int64_t *intnum)

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)

int av_opt_flag_is_set (void *obj, const char *field_name, const char *flag_name)

Check whether a particular flag is set in a flags field.

static void opt_list (void *obj, void *av_log_obj, const char *unit, int req_flags, int rej_flags)

int av_opt_show2 (void *obj, void *av_log_obj, int req_flags, int rej_flags)

Show the obj options.

void av_opt_set_defaults2 (void *s, int mask, int flags)

Set the values of the AVCodecContext or AVFormatContext structure.

void av_opt_set_defaults (void *s)

static int parse_key_value_pair (void *ctx, const char **buf, const char *key_val_sep, const char *pairs_sep)

Store the value in the field in ctx that is named like key.

int av_set_options_string (void *ctx, const char *opts, const char *key_val_sep, const char *pairs_sep)

Parse the key/value pairs list in opts.

void av_opt_free (void *obj)

Free all string and binary options in obj.

int av_opt_set_dict (void *obj, AVDictionary **options)

const AVOption * av_opt_find (void *obj, const char *name, const char *unit, int opt_flags, int search_flags)

Look for an option in an object.

Variables

static const double const_values []

static const char *const const_names []

Detailed Description

AVOptions.

Author:: Michael Niedermayer <michaelni@gmx.at>

Definition in file opt.c.

Function Documentation

const AVOption* av_find_opt	(	void *	obj,
		const char *	name,
		const char *	unit,
		int	mask,
		int	flags
	)

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).

Parameters:

`[in]`	obj	a pointer to a struct whose first element is a pointer to an AVClass
`[in]`	name	the name of the option to look for
`[in]`	unit	the unit of the option to look for, or any if NULL

Returns:: a pointer to the option found, or NULL if no option has been found

Deprecated:: use av_opt_find.

Definition at line 36 of file opt.c.

Referenced by av_opt_flag_is_set(), ff_rtp_chain_mux_open(), opt_default(), and set_context_opts().

double av_get_double	(	void *	obj,
		const char *	name,
		const AVOption **	o_out
	)

Definition at line 290 of file opt.c.

Referenced by av_set_string3().

int64_t av_get_int	(	void *	obj,
		const char *	name,
		const AVOption **	o_out
	)

Definition at line 315 of file opt.c.

Referenced by av_opt_flag_is_set(), av_set_string3(), ff_rtp_chain_mux_open(), new_output_stream(), opt_bitrate(), and queue_picture().

static int av_get_number	(	void *	obj,
		const char *	name,
		const AVOption **	o_out,
		double *	num,
		int *	den,
		int64_t *	intnum
	)			`[static]`

Definition at line 263 of file opt.c.

Referenced by av_get_double(), av_get_int(), and av_get_q().

AVRational av_get_q	(	void *	obj,
		const char *	name,
		const AVOption **	o_out
	)

Definition at line 301 of file opt.c.

const char* av_get_string	(	void *	obj,
		const char *	name,
		const AVOption **	o_out,
		char *	buf,
		int	buf_len
	)

Parameters:

	buf	a buffer which is used for returning non string values as strings, can be NULL
	buf_len	allocated length in bytes of buf

Definition at line 230 of file opt.c.

Referenced by set_context_opts().

const AVOption* av_next_option	(	void *	obj,
		const AVOption *	last
	)

Definition at line 48 of file opt.c.

Referenced by av_find_opt(), av_opt_find(), av_opt_free(), av_opt_set_defaults2(), and opt_list().

const AVOption* av_opt_find	(	void *	obj,
		const char *	name,
		const char *	unit,
		int	opt_flags,
		int	search_flags
	)

Look for an option in an object.

Consider only options which have all the specified flags set.

Parameters:

`[in]`	obj	A pointer to a struct whose first element is a pointer to an AVClass.
`[in]`	name	The name of the option to look for.
`[in]`	unit	When searching for named constants, name of the unit it belongs to.
	opt_flags	Find only options with all the specified flags set (AV_OPT_FLAG).
	search_flags	A combination of AV_OPT_SEARCH_*.

Returns:: 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.

Definition at line 567 of file opt.c.

Referenced by av_get_number(), av_get_string(), av_set_number2(), av_set_string3(), ffserver_opt_default(), opt_default(), opt_default2(), and opt_find().

int av_opt_flag_is_set	(	void *	obj,
		const char *	field_name,
		const char *	flag_name
	)

Check whether a particular flag is set in a flags field.

Parameters:

	field_name	the name of the flag field option
	flag_name	the name of the flag to check

Returns:: 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.

Definition at line 326 of file opt.c.

void av_opt_free ( void * obj )

Free all string and binary options in obj.

Definition at line 538 of file opt.c.

Referenced by av_write_trailer(), avcodec_close(), and avformat_free_context().

void av_opt_set_defaults ( void * s )

Definition at line 470 of file opt.c.

Referenced by alloc_priv_context(), av_set_parameters(), avcodec_get_context_defaults3(), avcodec_open2(), avformat_alloc_output_context2(), avformat_get_context_defaults(), avformat_open_input(), avformat_write_header(), sws_alloc_context(), and url_alloc_for_protocol().

void av_opt_set_defaults2	(	void *	s,
		int	mask,
		int	flags
	)

Set the values of the AVCodecContext or AVFormatContext structure.

They are set to the defaults specified in the according AVOption options array default_val field.

Parameters:

s

AVCodecContext or AVFormatContext for which the defaults will be set

Definition at line 423 of file opt.c.

Referenced by av_opt_set_defaults(), avcodec_get_context_defaults2(), and init().

int av_opt_set_dict	(	void *	obj,
		AVDictionary **	options
	)

Definition at line 546 of file opt.c.

Referenced by avcodec_open2(), avformat_open_input(), and avformat_write_header().

int av_opt_show2	(	void *	obj,
		void *	av_log_obj,
		int	req_flags,
		int	rej_flags
	)

Show the obj options.

Parameters:

	req_flags	requested flags for the options to show. Show only the options for which it is opt->flags & req_flags.
	rej_flags	rejected flags for the options to show. Show only the options for which it is !(opt->flags & req_flags).
	av_log_obj	log context to use for showing the options

Definition at line 405 of file opt.c.

Referenced by opt_help().

const AVOption* av_set_double	(	void *	obj,
		const char *	name,
		double	n
	)

Definition at line 210 of file opt.c.

Referenced by av_opt_set_defaults2().

const AVOption* av_set_int	(	void *	obj,
		const char *	name,
		int64_t	n
	)

Definition at line 220 of file opt.c.

Referenced by av_opt_set_defaults2(), and ff_rtp_chain_mux_open().

static const AVOption* av_set_number	(	void *	obj,
		const char *	name,
		double	num,
		int	den,
		int64_t	intnum
	)			`[static]`

Definition at line 87 of file opt.c.

Referenced by av_set_double(), av_set_int(), and av_set_q().

static int av_set_number2	(	void *	obj,
		const char *	name,
		double	num,
		int	den,
		int64_t	intnum,
		const AVOption **	o_out
	)			`[static]`

Definition at line 55 of file opt.c.

Referenced by av_set_number(), and av_set_string3().

int av_set_options_string	(	void *	ctx,
		const char *	opts,
		const char *	key_val_sep,
		const char *	pairs_sep
	)

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.

Parameters:

	opts	options string to parse, may be NULL
	key_val_sep	a 0-terminated list of characters used to separate key from value
	pairs_sep	a 0-terminated list of characters used to separate two pairs from each other

Returns:: 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

Definition at line 519 of file opt.c.

Referenced by init().

const AVOption* av_set_q	(	void *	obj,
		const char *	name,
		AVRational	n
	)

Definition at line 215 of file opt.c.

Referenced by av_opt_set_defaults2().

int av_set_string3	(	void *	obj,
		const char *	name,
		const char *	val,
		int	alloc,
		const AVOption **	o_out
	)

Set the field of obj with the given name to value.

Parameters:

`[in]`	obj	A struct whose first element is a pointer to an AVClass.
`[in]`	name	the name of the field to set
`[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.
`[out]`	o_out	if non-NULL put here a pointer to the AVOption found
	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

Returns:: 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

Definition at line 117 of file opt.c.

Referenced by av_opt_set_defaults2(), av_opt_set_dict(), ffserver_opt_default(), open_input(), opt_default(), opt_default2(), parse_key_value_pair(), and set_context_opts().

static int hexchar2int ( char c ) [static]

Definition at line 110 of file opt.c.

Referenced by av_set_string3().

static void opt_list	(	void *	obj,
		void *	av_log_obj,
		const char *	unit,
		int	req_flags,
		int	rej_flags
	)			`[static]`

Definition at line 336 of file opt.c.

Referenced by av_opt_show2().

static int parse_key_value_pair	(	void *	ctx,
		const char **	buf,
		const char *	key_val_sep,
		const char *	pairs_sep
	)			`[static]`

Store the value in the field in ctx that is named like key.

ctx must be an AVClass context, storing is done using AVOptions.

Parameters:

	buf	the string to parse, buf will be updated to point at the separator just after the parsed key/value pair
	key_val_sep	a 0-terminated list of characters used to separate key from value
	pairs_sep	a 0-terminated list of characters used to separate two pairs from each other

Returns:: 0 if the key/value pair has been successfully parsed and set, or a negative value corresponding to an AVERROR code in case of error: AVERROR(EINVAL) if the key/value pair cannot be parsed, the error code issued by av_set_string3() if the key/value pair cannot be set

Definition at line 492 of file opt.c.

Referenced by av_set_options_string().

Variable Documentation

const char* const const_names[] [static]

Initial value:

 {
    "PI",
    "E",
    "QP2LAMBDA",
    0
}

Definition at line 103 of file opt.c.

Referenced by av_set_string3(), config(), ff_rate_control_init(), and vf_open().

const double const_values[] [static]

Initial value:

 {
    M_PI,
    M_E,
    FF_QP2LAMBDA,
    0
}

Definition at line 96 of file opt.c.

Referenced by av_set_string3(), config(), get_qscale(), and put_image().


Functions
const AVOption *	av_find_opt (void v, const char name, const char *unit, int mask, int flags)
	Look for an option in obj.
const AVOption *	av_next_option (void obj, const AVOption last)
static int	av_set_number2 (void obj, const char name, double num, int den, int64_t intnum, const AVOption **o_out)
static const AVOption *	av_set_number (void obj, const char name, double num, int den, int64_t intnum)
static int	hexchar2int (char c)
int	av_set_string3 (void obj, const char name, const char val, int alloc, const AVOption *o_out)
	Set the field of obj with the given name to value.
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)
const char *	av_get_string (void obj, const char name, const AVOption *o_out, char buf, int buf_len)
static int	av_get_number (void obj, const char name, const AVOption *o_out, double num, int den, int64_t intnum)
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)
int	av_opt_flag_is_set (void obj, const char field_name, const char *flag_name)
	Check whether a particular flag is set in a flags field.
static void	opt_list (void obj, void av_log_obj, const char *unit, int req_flags, int rej_flags)
int	av_opt_show2 (void obj, void av_log_obj, int req_flags, int rej_flags)
	Show the obj options.
void	av_opt_set_defaults2 (void *s, int mask, int flags)
	Set the values of the AVCodecContext or AVFormatContext structure.
void	av_opt_set_defaults (void *s)
static int	parse_key_value_pair (void ctx, const char buf, const char key_val_sep, const char *pairs_sep)
	Store the value in the field in ctx that is named like key.
int	av_set_options_string (void ctx, const char opts, const char key_val_sep, const char pairs_sep)
	Parse the key/value pairs list in opts.
void	av_opt_free (void *obj)
	Free all string and binary options in obj.
int	av_opt_set_dict (void obj, AVDictionary *options)
const AVOption *	av_opt_find (void obj, const char name, const char *unit, int opt_flags, int search_flags)
	Look for an option in an object.
Variables
static const double	const_values []
static const char *const	const_names []