cmdutils.c File Reference

#include <string.h>
#include <stdlib.h>
#include <errno.h>
#include <math.h>
#include "config.h"
#include "libavformat/avformat.h"
#include "libavfilter/avfilter.h"
#include "libavdevice/avdevice.h"
#include "libavresample/avresample.h"
#include "libswscale/swscale.h"
#include "libswresample/swresample.h"
#include "libavutil/avassert.h"
#include "libavutil/avstring.h"
#include "libavutil/mathematics.h"
#include "libavutil/parseutils.h"
#include "libavutil/pixdesc.h"
#include "libavutil/eval.h"
#include "libavutil/dict.h"
#include "libavutil/opt.h"
#include "cmdutils.h"
#include "version.h"

Go to the source code of this file.

Defines

#define FLAGS(o)   ((o)->type == AV_OPT_TYPE_FLAGS) ? AV_DICT_APPEND : 0

#define INDENT   1

#define SHOW_VERSION   2

#define SHOW_CONFIG   4

#define SHOW_COPYRIGHT   8

#define PRINT_LIB_INFO(libname, LIBNAME, flags, level)

#define sws_isSupportedInput(x)   0

#define sws_isSupportedOutput(x)   0

Functions

void init_opts (void)

Initialize the cmdutils option system, in particular allocate the *_opts contexts.

void uninit_opts (void)

Uninitialize the cmdutils option system, in particular free the *_opts contexts and their contents.

void log_callback_help (void *ptr, int level, const char *fmt, va_list vl)

Trivial log callback.

static void log_callback_report (void *ptr, int level, const char *fmt, va_list vl)

double parse_number_or_die (const char *context, const char *numstr, int type, double min, double max)

Parse a string and return its corresponding value as a double.

int64_t parse_time_or_die (const char *context, const char *timestr, int is_duration)

Parse a string specifying a time and return its corresponding value as a number of microseconds.

void show_help_options (const OptionDef *options, const char *msg, int mask, int value)

void show_help_children (const AVClass *class, int flags)

Show help for all options with given flags in class and all its children.

static const OptionDef * find_option (const OptionDef *po, const char *name)

static void prepare_app_arguments (int *argc_ptr, char ***argv_ptr)

int parse_option (void *optctx, const char *opt, const char *arg, const OptionDef *options)

Parse one given option.

void parse_options (void *optctx, int argc, char **argv, const OptionDef *options, void(*parse_arg_function)(void *, const char *))

int locate_option (int argc, char **argv, const OptionDef *options, const char *optname)

Return index of option opt in argv or 0 if not found.

static void dump_argument (const char *a)

void parse_loglevel (int argc, char **argv, const OptionDef *options)

Find the '-loglevel' option in the command line args and apply it.

int opt_default (const char *opt, const char *arg)

Fallback for options that are not explicitly handled, these will be parsed through AVOptions.

int opt_loglevel (const char *opt, const char *arg)

Set the libav* libraries log level.

int opt_report (const char *opt)

int opt_max_alloc (const char *opt, const char *arg)

int opt_cpuflags (const char *opt, const char *arg)

int opt_codec_debug (const char *opt, const char *arg)

int opt_timelimit (const char *opt, const char *arg)

Limit the execution time.

void print_error (const char *filename, int err)

Print an error message to stderr, indicating filename and a human readable description of the error code err.

static void print_all_libs_info (int flags, int level)

static void print_program_info (int flags, int level)

void show_banner (int argc, char **argv, const OptionDef *options)

Print the program banner to stderr.

int opt_version (const char *opt, const char *arg)

Print the version of the program to stdout.

int opt_license (const char *opt, const char *arg)

Print the license of the program to stdout.

int opt_formats (const char *opt, const char *arg)

Print a listing containing all the formats supported by the program.

static char get_media_type_char (enum AVMediaType type)

int opt_codecs (const char *opt, const char *arg)

Print a listing containing all the codecs supported by the program.

int opt_bsfs (const char *opt, const char *arg)

Print a listing containing all the bit stream filters supported by the program.

int opt_protocols (const char *opt, const char *arg)

Print a listing containing all the protocols supported by the program.

int opt_filters (const char *opt, const char *arg)

Print a listing containing all the filters supported by the program.

int opt_pix_fmts (const char *opt, const char *arg)

Print a listing containing all the pixel formats supported by the program.

int show_sample_fmts (const char *opt, const char *arg)

Print a listing containing all the sample formats supported by the program.

int read_yesno (void)

Return a positive value if a line read from standard input starts with [yY], otherwise return 0.

int cmdutils_read_file (const char *filename, char **bufptr, size_t *size)

Read the file with name filename, and put its content in a newly allocated 0-terminated buffer.

FILE * get_preset_file (char *filename, size_t filename_size, const char *preset_name, int is_path, const char *codec_name)

Get a file corresponding to a preset file.

int check_stream_specifier (AVFormatContext *s, AVStream *st, const char *spec)

Check if the given stream matches a stream specifier.

AVDictionary * filter_codec_opts (AVDictionary *opts, AVCodec *codec, AVFormatContext *s, AVStream *st)

Filter out options for given codec.

AVDictionary ** setup_find_stream_info_opts (AVFormatContext *s, AVDictionary *codec_opts)

Setup AVCodecContext options for avformat_find_stream_info().

void * grow_array (void *array, int elem_size, int *size, int new_size)

Realloc array to hold new_size elements of elem_size.

Variables

struct SwsContext * sws_opts

SwrContext * swr_opts

AVDictionary * format_opts

AVDictionary * codec_opts

const int this_year = 2012

this year, defined by the program for show_banner()

static FILE * report_file

static int warned_cfg = 0

Define Documentation

#define FLAGS ( o ) ((o)->type == AV_OPT_TYPE_FLAGS) ? AV_DICT_APPEND : 0

Definition at line 420 of file cmdutils.c.

Referenced by opt_default().

#define INDENT 1

Definition at line 592 of file cmdutils.c.

Referenced by print_program_info(), and show_banner().

#define PRINT_LIB_INFO	(	libname,
		LIBNAME,
		flags,
		level	)

Value:

if (CONFIG_##LIBNAME) {                                             \
        const char *indent = flags & INDENT? "  " : "";                 \
        if (flags & SHOW_VERSION) {                                     \
            unsigned int version = libname##_version();                 \
            av_log(NULL, level,                                         \
                   "%slib%-11s %2d.%3d.%3d / %2d.%3d.%3d\n",            \
                   indent, #libname,                                    \
                   LIB##LIBNAME##_VERSION_MAJOR,                        \
                   LIB##LIBNAME##_VERSION_MINOR,                        \
                   LIB##LIBNAME##_VERSION_MICRO,                        \
                   version >> 16, version >> 8 & 0xff, version & 0xff); \
        }                                                               \
        if (flags & SHOW_CONFIG) {                                      \
            const char *cfg = libname##_configuration();                \
            if (strcmp(FFMPEG_CONFIGURATION, cfg)) {                    \
                if (!warned_cfg) {                                      \
                    av_log(NULL, level,                                 \
                            "%sWARNING: library configuration mismatch\n", \
                            indent);                                    \
                    warned_cfg = 1;                                     \
                }                                                       \
                av_log(NULL, level, "%s%-11s configuration: %s\n",      \
                        indent, #libname, cfg);                         \
            }                                                           \
        }                                                               \
    }                                                                   \

Definition at line 597 of file cmdutils.c.

Referenced by print_all_libs_info().

#define SHOW_CONFIG 4

Definition at line 594 of file cmdutils.c.

Referenced by show_banner().

#define SHOW_COPYRIGHT 8

Definition at line 595 of file cmdutils.c.

Referenced by print_program_info(), and show_banner().

#define SHOW_VERSION 2

Definition at line 593 of file cmdutils.c.

Referenced by opt_version(), and show_banner().

#define sws_isSupportedInput ( x ) 0

Referenced by opt_pix_fmts(), query_formats(), selfTest(), sws_init_context(), and sws_isSupportedInput().

#define sws_isSupportedOutput ( x ) 0

Referenced by opt_pix_fmts(), query_formats(), selfTest(), sws_init_context(), and sws_isSupportedOutput().

Function Documentation

int check_stream_specifier	(	AVFormatContext *	s,
		AVStream *	st,
		const char *	spec
	)

Check if the given stream matches a stream specifier.

Parameters:

	s	Corresponding format context.
	st	Stream from s to be checked.
	spec	A stream specifier of the [v\|a\|s\|d]:[<stream index>] form.

Returns:: 1 if the stream matches, 0 if it doesn't, <0 on error

Definition at line 1065 of file cmdutils.c.

Referenced by copy_metadata(), filter_codec_opts(), init_input_filter(), opt_input_file(), opt_map(), and opt_output_file().

int cmdutils_read_file	(	const char *	filename,
		char **	bufptr,
		size_t *	size
	)

Read the file with name filename, and put its content in a newly allocated 0-terminated buffer.

Parameters:

	bufptr	location where pointer to buffer is returned
	size	location where size of buffer is returned

Returns:: 0 in case of success, a negative value corresponding to an AVERROR error code in case of failure.

Definition at line 978 of file cmdutils.c.

Referenced by transcode_init().

static void dump_argument ( const char * a ) [static]

Definition at line 374 of file cmdutils.c.

Referenced by parse_loglevel().

AVDictionary* filter_codec_opts	(	AVDictionary *	opts,
		AVCodec *	codec,
		AVFormatContext *	s,
		AVStream *	st
	)

Filter out options for given codec.

Create a new options dictionary containing only the options from opts which apply to the codec with ID codec_id.

Parameters:

	s	Corresponding format context.
	st	A stream from s for which the options should be filtered.

Returns:: a pointer to the created dictionary

Definition at line 1125 of file cmdutils.c.

Referenced by add_input_streams(), new_output_stream(), setup_find_stream_info_opts(), and stream_component_open().

static const OptionDef* find_option	(	const OptionDef *	po,
		const char *	name
	)			`[static]`

Definition at line 172 of file cmdutils.c.

Referenced by locate_option(), and parse_option().

static char get_media_type_char ( enum AVMediaType type ) [static]

Definition at line 790 of file cmdutils.c.

Referenced by opt_codecs(), and opt_filters().

FILE* get_preset_file	(	char *	filename,
		size_t	filename_size,
		const char *	preset_name,
		int	is_path,
		const char *	codec_name
	)

Get a file corresponding to a preset file.

If is_path is non-zero, look for the file in the path preset_name. Otherwise search for a file named arg.ffpreset in the directories $FFMPEG_DATADIR (if set), $HOME/.ffmpeg, and in the datadir defined at configuration time or in a "ffpresets" folder along the executable on win32, in that order. If no such file is found and codec_name is defined, then search for a file named codec_name-preset_name.avpreset in the above-mentioned directories.

Parameters:

	filename	buffer where the name of the found filename is written
	filename_size	size in bytes of the filename buffer
	preset_name	name of the preset to search
	is_path	tell if preset_name is a filename path
	codec_name	name of the codec for which to look for the preset, may be NULL

Definition at line 1015 of file cmdutils.c.

Referenced by ffserver_opt_preset(), and opt_preset().

void* grow_array	(	void *	array,
		int	elem_size,
		int *	size,
		int	new_size
	)

Realloc array to hold new_size elements of elem_size.

Calls exit_program() on failure.

Parameters:

	elem_size	size in bytes of each element
	size	new element count will be written here

Returns:: reallocated array

Definition at line 1200 of file cmdutils.c.

Referenced by add_input_streams(), configure_complex_filter(), init_input_filter(), init_simple_filtergraph(), new_output_stream(), opt_attach(), opt_filter_complex(), opt_input_file(), opt_map(), opt_map_channel(), opt_output_file(), opt_streamid(), and parse_option().

void init_opts ( void )

Initialize the cmdutils option system, in particular allocate the *_opts contexts.

Definition at line 66 of file cmdutils.c.

Referenced by main(), and reset_options().

int locate_option	(	int	argc,
		char **	argv,
		const OptionDef *	options,
		const char *	optname
	)

Return index of option opt in argv or 0 if not found.

Definition at line 348 of file cmdutils.c.

Referenced by parse_cpuflags(), parse_loglevel(), and show_banner().

void log_callback_help	(	void *	ptr,
		int	level,
		const char *	fmt,
		va_list	vl
	)

Trivial log callback.

Only suitable for opt_help and similar since it lacks prefix handling.

Definition at line 86 of file cmdutils.c.

Referenced by opt_help(), and opt_version().

static void log_callback_report	(	void *	ptr,
		int	level,
		const char *	fmt,
		va_list	vl
	)			`[static]`

Definition at line 91 of file cmdutils.c.

Referenced by opt_report().

int opt_bsfs	(	const char *	opt,
		const char *	arg
	)

Print a listing containing all the bit stream filters supported by the program.

This option processing function does not utilize the arguments.

Definition at line 865 of file cmdutils.c.

int opt_codec_debug	(	const char *	opt,
		const char *	arg
	)

Definition at line 561 of file cmdutils.c.

int opt_codecs	(	const char *	opt,
		const char *	arg
	)

Print a listing containing all the codecs supported by the program.

This option processing function does not utilize the arguments.

Definition at line 802 of file cmdutils.c.

int opt_cpuflags	(	const char *	opt,
		const char *	arg
	)

Definition at line 549 of file cmdutils.c.

Referenced by parse_cpuflags().

int opt_default	(	const char *	opt,
		const char *	arg
	)

Fallback for options that are not explicitly handled, these will be parsed through AVOptions.

Definition at line 421 of file cmdutils.c.

Referenced by opt_bitrate(), opt_channel_layout(), opt_codec_debug(), opt_frame_pix_fmt(), opt_frame_size(), opt_passlogfile(), opt_preset(), opt_profile(), opt_target(), opt_video_channel(), and opt_video_standard().

int opt_filters	(	const char *	opt,
		const char *	arg
	)

Print a listing containing all the filters supported by the program.

This option processing function does not utilize the arguments.

Definition at line 891 of file cmdutils.c.

int opt_formats	(	const char *	opt,
		const char *	arg
	)

Print a listing containing all the formats supported by the program.

This option processing function does not utilize the arguments.

Definition at line 742 of file cmdutils.c.

int opt_license	(	const char *	opt,
		const char *	arg
	)

Print the license of the program to stdout.

The license depends on the license of the libraries compiled into the program. This option processing function does not utilize the arguments.

Definition at line 672 of file cmdutils.c.

int opt_loglevel	(	const char *	opt,
		const char *	arg
	)

Set the libav* libraries log level.

Definition at line 468 of file cmdutils.c.

Referenced by parse_loglevel().

int opt_max_alloc	(	const char *	opt,
		const char *	arg
	)

Definition at line 535 of file cmdutils.c.

int opt_pix_fmts	(	const char *	opt,
		const char *	arg
	)

Print a listing containing all the pixel formats supported by the program.

This option processing function does not utilize the arguments.

Definition at line 923 of file cmdutils.c.

int opt_protocols	(	const char *	opt,
		const char *	arg
	)

Print a listing containing all the protocols supported by the program.

This option processing function does not utilize the arguments.

Definition at line 876 of file cmdutils.c.

int opt_report ( const char * opt )

Definition at line 503 of file cmdutils.c.

Referenced by parse_loglevel().

int opt_timelimit	(	const char *	opt,
		const char *	arg
	)

Limit the execution time.

Definition at line 567 of file cmdutils.c.

int opt_version	(	const char *	opt,
		const char *	arg
	)

Print the version of the program to stdout.

The version message depends on the current versions of the repository and of the libav* libraries. This option processing function does not utilize the arguments.

Definition at line 665 of file cmdutils.c.

void parse_loglevel	(	int	argc,
		char **	argv,
		const OptionDef *	options
	)

Find the '-loglevel' option in the command line args and apply it.

Definition at line 398 of file cmdutils.c.

Referenced by main().

double parse_number_or_die	(	const char *	context,
		const char *	numstr,
		int	type,
		double	min,
		double	max
	)

Parse a string and return its corresponding value as a double.

Exit from the application if the string cannot be correctly parsed or the corresponding value is invalid.

Parameters:

	context	the context of the value to be set (e.g. the corresponding command line option name)
	numstr	the string to be parsed
	type	the type (OPT_INT64 or OPT_FLOAT) as which the string should be parsed
	min	the minimum valid accepted value
	max	the maximum valid accepted value

Definition at line 105 of file cmdutils.c.

Referenced by opt_height(), opt_pass(), opt_show_mode(), opt_streamid(), opt_timelimit(), opt_vsync(), opt_width(), and parse_option().

int parse_option	(	void *	optctx,
		const char *	opt,
		const char *	arg,
		const OptionDef *	options
	)

Parse one given option.

Returns:: on success 1 if arg was consumed, 0 otherwise; negative number on error

Definition at line 246 of file cmdutils.c.

Referenced by opt_audio_codec(), opt_audio_filters(), opt_audio_frames(), opt_audio_qscale(), opt_bitrate(), opt_channel_layout(), opt_data_codec(), opt_data_frames(), opt_old2new(), opt_profile(), opt_qscale(), opt_recording_timestamp(), opt_subtitle_codec(), opt_target(), opt_video_codec(), opt_video_filters(), opt_video_frames(), and parse_options().

void parse_options	(	void *	optctx,
		int	argc,
		char **	argv,
		const OptionDef *	options,
		void()(void , const char *)	parse_arg_function
	)

Definition at line 317 of file cmdutils.c.

Referenced by main(), and parse_script().

int64_t parse_time_or_die	(	const char *	context,
		const char *	timestr,
		int	is_duration
	)

Parse a string specifying a time and return its corresponding value as a number of microseconds.

Exit from the application if the string cannot be correctly parsed.

Parameters:

	context	the context of the value to be set (e.g. the corresponding command line option name)
	timestr	the string to be parsed
	is_duration	a flag which tells how to interpret timestr, if not zero timestr is interpreted as a duration, otherwise as a date

See also:: parse_date()

Definition at line 126 of file cmdutils.c.

Referenced by opt_duration(), opt_recording_timestamp(), opt_seek(), parse_forced_key_frames(), and parse_option().

static void prepare_app_arguments	(	int *	argc_ptr,
		char ***	argv_ptr
	)			`[inline, static]`

Definition at line 240 of file cmdutils.c.

Referenced by parse_options().

static void print_all_libs_info	(	int	flags,
		int	level
	)			`[static]`

Definition at line 625 of file cmdutils.c.

Referenced by opt_version(), and show_banner().

void print_error	(	const char *	filename,
		int	err
	)

Print an error message to stderr, indicating filename and a human readable description of the error code err.

If strerror_r() is not available the use of this function in a multithreaded application may be unsafe.

See also:: av_strerror()

Definition at line 580 of file cmdutils.c.

Referenced by open_input_file(), opt_input_file(), opt_output_file(), read_thread(), and write_frame().

static void print_program_info	(	int	flags,
		int	level
	)			`[static]`

Definition at line 640 of file cmdutils.c.

Referenced by opt_version(), and show_banner().

int read_yesno ( void )

Return a positive value if a line read from standard input starts with [yY], otherwise return 0.

Definition at line 967 of file cmdutils.c.

Referenced by assert_file_overwrite().

AVDictionary** setup_find_stream_info_opts	(	AVFormatContext *	s,
		AVDictionary *	codec_opts
	)

Setup AVCodecContext options for avformat_find_stream_info().

Create an array of dictionaries, one dictionary for each stream contained in s. Each dictionary will contain the options from codec_opts which can be applied to the corresponding stream codec context.

Returns:: pointer to the created array of dictionaries, NULL if it cannot be created

Definition at line 1180 of file cmdutils.c.

Referenced by opt_input_file(), and read_thread().

void show_banner	(	int	argc,
		char **	argv,
		const OptionDef *	options
	)

Print the program banner to stderr.

The banner contents depend on the current version of the repository and of the libav* libraries used by the program.

Definition at line 654 of file cmdutils.c.

Referenced by main().

void show_help_children	(	const AVClass *	class,
		int	flags
	)

Show help for all options with given flags in class and all its children.

Definition at line 162 of file cmdutils.c.

Referenced by opt_help(), and show_help_children().

void show_help_options	(	const OptionDef *	options,
		const char *	msg,
		int	mask,
		int	value
	)

Definition at line 138 of file cmdutils.c.

Referenced by opt_help().

int show_sample_fmts	(	const char *	opt,
		const char *	arg
	)

Print a listing containing all the sample formats supported by the program.

Definition at line 958 of file cmdutils.c.

void uninit_opts ( void )

Uninitialize the cmdutils option system, in particular free the *_opts contexts and their contents.

Definition at line 75 of file cmdutils.c.

Referenced by do_exit(), exit_program(), main(), and reset_options().

Variable Documentation

AVDictionary * codec_opts

Definition at line 60 of file cmdutils.c.

Referenced by add_input_streams(), new_output_stream(), opt_input_file(), opt_output_file(), read_thread(), and stream_component_open().

AVDictionary* format_opts

Definition at line 60 of file cmdutils.c.

Referenced by main(), open_input_file(), opt_input_file(), opt_output_file(), and read_thread().

FILE* report_file [static]

Definition at line 64 of file cmdutils.c.

Referenced by dump_argument(), log_callback_report(), opt_report(), and parse_loglevel().

SwrContext* swr_opts

Definition at line 59 of file cmdutils.c.

Referenced by new_output_stream().

struct SwsContext* sws_opts

Definition at line 58 of file cmdutils.c.

Referenced by new_output_stream(), and queue_picture().

const int this_year = 2012

this year, defined by the program for show_banner()

Definition at line 62 of file cmdutils.c.

Referenced by ffprobe_show_program_version(), and print_program_info().

int warned_cfg = 0 [static]

Definition at line 590 of file cmdutils.c.


Defines
#define	FLAGS(o) ((o)->type == AV_OPT_TYPE_FLAGS) ? AV_DICT_APPEND : 0
#define	INDENT 1
#define	SHOW_VERSION 2
#define	SHOW_CONFIG 4
#define	SHOW_COPYRIGHT 8
#define	PRINT_LIB_INFO(libname, LIBNAME, flags, level)
#define	sws_isSupportedInput(x) 0
#define	sws_isSupportedOutput(x) 0
Functions
void	init_opts (void)
	Initialize the cmdutils option system, in particular allocate the *_opts contexts.
void	uninit_opts (void)
	Uninitialize the cmdutils option system, in particular free the *_opts contexts and their contents.
void	log_callback_help (void ptr, int level, const char fmt, va_list vl)
	Trivial log callback.
static void	log_callback_report (void ptr, int level, const char fmt, va_list vl)
double	parse_number_or_die (const char context, const char numstr, int type, double min, double max)
	Parse a string and return its corresponding value as a double.
int64_t	parse_time_or_die (const char context, const char timestr, int is_duration)
	Parse a string specifying a time and return its corresponding value as a number of microseconds.
void	show_help_options (const OptionDef options, const char msg, int mask, int value)
void	show_help_children (const AVClass *class, int flags)
	Show help for all options with given flags in class and all its children.
static const OptionDef *	find_option (const OptionDef po, const char name)
static void	prepare_app_arguments (int argc_ptr, char **argv_ptr)
int	parse_option (void optctx, const char opt, const char arg, const OptionDef options)
	Parse one given option.
void	parse_options (void optctx, int argc, char argv, const OptionDef options, void(parse_arg_function)(void , const char *))
int	locate_option (int argc, char *argv, const OptionDef options, const char *optname)
	Return index of option opt in argv or 0 if not found.
static void	dump_argument (const char *a)
void	parse_loglevel (int argc, char *argv, const OptionDef options)
	Find the '-loglevel' option in the command line args and apply it.
int	opt_default (const char opt, const char arg)
	Fallback for options that are not explicitly handled, these will be parsed through AVOptions.
int	opt_loglevel (const char opt, const char arg)
	Set the libav* libraries log level.
int	opt_report (const char *opt)
int	opt_max_alloc (const char opt, const char arg)
int	opt_cpuflags (const char opt, const char arg)
int	opt_codec_debug (const char opt, const char arg)
int	opt_timelimit (const char opt, const char arg)
	Limit the execution time.
void	print_error (const char *filename, int err)
	Print an error message to stderr, indicating filename and a human readable description of the error code err.
static void	print_all_libs_info (int flags, int level)
static void	print_program_info (int flags, int level)
void	show_banner (int argc, char *argv, const OptionDef options)
	Print the program banner to stderr.
int	opt_version (const char opt, const char arg)
	Print the version of the program to stdout.
int	opt_license (const char opt, const char arg)
	Print the license of the program to stdout.
int	opt_formats (const char opt, const char arg)
	Print a listing containing all the formats supported by the program.
static char	get_media_type_char (enum AVMediaType type)
int	opt_codecs (const char opt, const char arg)
	Print a listing containing all the codecs supported by the program.
int	opt_bsfs (const char opt, const char arg)
	Print a listing containing all the bit stream filters supported by the program.
int	opt_protocols (const char opt, const char arg)
	Print a listing containing all the protocols supported by the program.
int	opt_filters (const char opt, const char arg)
	Print a listing containing all the filters supported by the program.
int	opt_pix_fmts (const char opt, const char arg)
	Print a listing containing all the pixel formats supported by the program.
int	show_sample_fmts (const char opt, const char arg)
	Print a listing containing all the sample formats supported by the program.
int	read_yesno (void)
	Return a positive value if a line read from standard input starts with [yY], otherwise return 0.
int	cmdutils_read_file (const char filename, char bufptr, size_t size)
	Read the file with name filename, and put its content in a newly allocated 0-terminated buffer.
FILE *	get_preset_file (char filename, size_t filename_size, const char preset_name, int is_path, const char *codec_name)
	Get a file corresponding to a preset file.
int	check_stream_specifier (AVFormatContext s, AVStream st, const char *spec)
	Check if the given stream matches a stream specifier.
AVDictionary *	filter_codec_opts (AVDictionary opts, AVCodec codec, AVFormatContext s, AVStream st)
	Filter out options for given codec.
AVDictionary **	setup_find_stream_info_opts (AVFormatContext s, AVDictionary codec_opts)
	Setup AVCodecContext options for avformat_find_stream_info().
void *	grow_array (void array, int elem_size, int size, int new_size)
	Realloc array to hold new_size elements of elem_size.
Variables
struct SwsContext *	sws_opts
SwrContext *	swr_opts
AVDictionary *	format_opts
AVDictionary *	codec_opts
const int	this_year = 2012
	this year, defined by the program for show_banner()
static FILE *	report_file
static int	warned_cfg = 0