misc parsing utilities More...

#include <time.h>
#include "avstring.h"
#include "avutil.h"
#include "common.h"
#include "eval.h"
#include "log.h"
#include "random_seed.h"
#include "time_internal.h"
#include "parseutils.h"

Data Structures
struct	VideoSizeAbbr

struct	VideoRateAbbr

struct	ColorEntry

Macros
#define	ALPHA_SEP '@'

Functions
int	av_parse_ratio (AVRational q, const char str, int max, int log_offset, void *log_ctx)
	Parse str and store the parsed ratio in q.

int	av_parse_video_size (int width_ptr, int height_ptr, const char *str)
	Parse str and put in width_ptr and height_ptr the detected values.

int	av_parse_video_rate (AVRational rate, const char arg)
	Parse str and store the detected values in *rate.

static int	color_table_compare (const void lhs, const void rhs)

int	av_parse_color (uint8_t rgba_color, const char color_string, int slen, void *log_ctx)
	Put the RGBA values that correspond to color_string in rgba_color.

const char *	av_get_known_color_name (int color_idx, const uint8_t **rgbp)
	Get the name of a color from the internal table of hard-coded named colors.

static int	date_get_num (const char **pp, int n_min, int n_max, int len_max)

char *	av_small_strptime (const char p, const char fmt, struct tm *dt)
	Parse the input string p according to the format string fmt and store its results in the structure dt.

time_t	av_timegm (struct tm *tm)
	Convert the decomposed UTC time in tm to a time_t value.

int	av_parse_time (int64_t timeval, const char timestr, int duration)
	Parse timestr and return in *time a corresponding number of microseconds.

int	av_find_info_tag (char arg, int arg_size, const char tag1, const char *info)
	Attempt to find a specific tag in a URL.

Variables
static const VideoSizeAbbr	video_size_abbrs []

static const VideoRateAbbr	video_rate_abbrs []

static const ColorEntry	color_table []

Detailed Description

misc parsing utilities

Definition in file parseutils.c.

Macro Definition Documentation

#define ALPHA_SEP '@'

Definition at line 342 of file parseutils.c.

Referenced by av_parse_color().

Function Documentation

int av_parse_ratio	(	AVRational *	q,
		const char *	str,
		int	max,
		int	log_offset,
		void *	log_ctx
	)

Parse str and store the parsed ratio in q.

Note that a ratio with infinite (1/0) or negative value is considered valid, so you should check on the returned value if you want to exclude those values.

The undefined value can be expressed using the "0:0" string.

Parameters

[in,out]	q	pointer to the AVRational which will contain the ratio
[in]	str	the string to parse: it has to be a string in the format num:den, a float number or an expression
[in]	max	the maximum allowed numerator and denominator
[in]	log_offset	log level offset which is applied to the log level of log_ctx
[in]	log_ctx	parent logging context

Returns: >= 0 on success, a negative error code otherwise

Definition at line 44 of file parseutils.c.

Referenced by ff_parse_time_base(), get_aspect_ratio(), new_video_stream(), and vivo_read_header().

int av_parse_video_size	(	int *	width_ptr,
		int *	height_ptr,
		const char *	str
	)

Parse str and put in width_ptr and height_ptr the detected values.

Parameters

[in,out]	width_ptr	pointer to the variable which will contain the detected width value
[in,out]	height_ptr	pointer to the variable which will contain the detected height value
[in]	str	the string to parse: it has to be a string in the format width x height or a valid video size abbreviation.

Returns: >= 0 on success, a negative error code otherwise

Examples:: scaling_video.c.

Definition at line 138 of file parseutils.c.

Referenced by add_input_streams(), av_opt_is_set_to_default(), create_stream(), dc1394_read_common(), ffserver_parse_config_stream(), init_dict(), main(), new_subtitle_stream(), new_video_stream(), set_string_image_size(), and vfw_read_header().

int av_parse_video_rate	(	AVRational *	rate,
		const char *	str
	)

Parse str and store the detected values in *rate.

Parameters

[in,out]	rate	pointer to the AVRational which will contain the detected frame rate
[in]	str	the string to parse: it has to be a string in the format rate_num / rate_den, a float number or a valid video rate abbreviation

Returns: >= 0 on success, a negative error code otherwise

Definition at line 169 of file parseutils.c.

Referenced by add_input_streams(), av_opt_is_set_to_default(), cdxl_read_header(), create_stream(), dc1394_read_common(), dshow_read_header(), grab_read_header(), new_video_stream(), set_string_video_rate(), v4l2_set_parameters(), and vfw_read_header().

static int color_table_compare	(	const void *	lhs,
		const void *	rhs
	)

static

Definition at line 337 of file parseutils.c.

Referenced by av_parse_color().

int av_parse_color	(	uint8_t *	rgba_color,
		const char *	color_string,
		int	slen,
		void *	log_ctx
	)

Put the RGBA values that correspond to color_string in rgba_color.

Parameters

color_string a string specifying a color. It can be the name of a color (case insensitive match) or a [0x|#]RRGGBB[AA] sequence, possibly followed by "@" and a string representing the alpha component. The alpha component may be a string composed by "0x" followed by an hexadecimal number or a decimal number between 0.0 and 1.0, which represents the opacity value (0x00/0.0 means completely transparent, 0xff/1.0 completely opaque). If the alpha component is not specified then 0xff is assumed. The string "random" will result in a random color.

slen length of the initial part of color_string containing the color. It can be set to -1 if color_string is a null terminated string containing nothing else than the color.

Returns: >= 0 in case of success, a negative value in case of failure (for example if color_string cannot be parsed).

Definition at line 344 of file parseutils.c.

Referenced by av_opt_is_set_to_default(), draw_text(), html_color_parse(), init(), set_param(), and set_string_color().

const char* av_get_known_color_name	(	int	color_idx,
		const uint8_t **	rgb
	)

Get the name of a color from the internal table of hard-coded named colors.

This function is meant to enumerate the color names recognized by av_parse_color().

Parameters

color_idx	index of the requested color, starting from 0
rgbp	if not NULL, will point to a 3-elements array with the color value in RGB

Returns: the color name string or NULL if color_idx is not in the array

Definition at line 424 of file parseutils.c.

Referenced by show_colors().

static int date_get_num	(	const char **	pp,
		int	n_min,
		int	n_max,
		int	len_max
	)

static

Definition at line 440 of file parseutils.c.

Referenced by av_small_strptime().

char* av_small_strptime	(	const char *	p,
		const char *	fmt,
		struct tm *	dt
	)

Parse the input string p according to the format string fmt and store its results in the structure dt.

This implementation supports only a subset of the formats supported by the standard strptime().

In particular it actually supports the parameters:

H: the hour as a decimal number, using a 24-hour clock, in the range '00' through '23'
J: hours as a decimal number, in the range '0' through INT_MAX
M: the minute as a decimal number, using a 24-hour clock, in the range '00' through '59'
S: the second as a decimal number, using a 24-hour clock, in the range '00' through '59'
Y: the year as a decimal number, using the Gregorian calendar
m: the month as a decimal number, in the range '1' through '12'
d: the day of the month as a decimal number, in the range '1' through '31'
%%: a literal ''

Returns: a pointer to the first character not processed in this function call, or NULL in case the function fails to match all of the fmt string and therefore an error occurred

Definition at line 464 of file parseutils.c.

Referenced by av_parse_time(), and ff_iso8601_to_unix_time().

time_t av_timegm ( struct tm * tm )

Convert the decomposed UTC time in tm to a time_t value.

Definition at line 532 of file parseutils.c.

Referenced by av_parse_time(), and ff_iso8601_to_unix_time().

int av_parse_time	(	int64_t *	timeval,
		const char *	timestr,
		int	duration
	)

Parse timestr and return in *time a corresponding number of microseconds.

Parameters

timeval	puts here the number of microseconds corresponding to the string in timestr. If the string represents a duration, it is the number of microseconds contained in the time interval. If the string is a date, is the number of microseconds since 1st of January, 1970 up to the time of the parsed date. If timestr cannot be successfully parsed, set *time to INT64_MIN.
timestr	a string representing a date or a duration. If a date the syntax is: [{YYYY-MM-DD\|YYYYMMDD}[T\|t\| ]]{{HH:MM:SS[.m...]]]}\|{HHMMSS[.m...]]]}}[Z] now If the value is "now" it takes the current time. Time is local time unless Z is appended, in which case it is interpreted as UTC. If the year-month-day part is not specified it takes the current year-month-day. If a duration the syntax is: [-][HH:]MM:SS[.m...] [-]S+[.m...]
duration	flag which tells how to interpret timestr, if not zero timestr is interpreted as a duration, otherwise as a date

Returns: >= 0 in case of success, a negative value corresponding to an AVERROR code otherwise

Definition at line 551 of file parseutils.c.

Referenced by av_opt_set(), concat_read_header(), ffm_write_header(), func_pts(), open_input_stream(), parse_interval(), parse_read_interval(), parse_time_or_die(), parse_times(), rtsp_parse_range_npt(), and seg_write_header().

int av_find_info_tag	(	char *	arg,
		int	arg_size,
		const char *	tag1,
		const char *	info
	)

Attempt to find a specific tag in a URL.

syntax: '?tag1=val1&tag2=val2...'. Little URL decoding is done. Return 1 if found.

Definition at line 670 of file parseutils.c.

Referenced by ff_rtp_set_remote_url(), ff_udp_set_remote_url(), open_input_stream(), rtp_open(), sap_write_header(), sctp_open(), set_options(), tcp_open(), tls_open(), and udp_open().

Variable Documentation

const VideoSizeAbbr video_size_abbrs[]

static

Definition at line 75 of file parseutils.c.

const VideoRateAbbr video_rate_abbrs[]

static

Initial value:

= {
    { "ntsc",      { 30000, 1001 } },
    { "pal",       {    25,    1 } },
    { "qntsc",     { 30000, 1001 } }, 
    { "qpal",      {    25,    1 } }, 
    { "sntsc",     { 30000, 1001 } }, 
    { "spal",      {    25,    1 } }, 
    { "film",      {    24,    1 } },
    { "ntsc-film", { 24000, 1001 } },
}

Definition at line 127 of file parseutils.c.

const ColorEntry color_table[]

static

Definition at line 194 of file parseutils.c.

Referenced by mov_parse_stsd_video(), and seq_decode_op1().

Data Structures

Macros

Functions

Variables

Detailed Description

Macro Definition Documentation

Function Documentation

Variable Documentation