parseutils.c File Reference

#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"

Go to the source code of this file.

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. More...
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. More...
int	av_parse_video_rate (AVRational *rate, const char *arg)
	Parse str and store the detected values in *rate. More...
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. More...
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. More...
static int	date_get_num (const char **pp, int n_min, int n_max, int len_max)
static int	date_get_month (const char **pp)
char *	av_small_strptime (const char *p, const char *fmt, struct tm *dt)
	Simplified version of strptime. More...
time_t	av_timegm (struct tm *tm)
	Convert the decomposed UTC time in tm to a time_t value. More...
int	av_parse_time (int64_t *timeval, const char *timestr, int duration)
	Parse timestr and return in *time a corresponding number of microseconds. More...
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. More...

Variables
static const VideoSizeAbbr	video_size_abbrs []
static const VideoRateAbbr	video_rate_abbrs []
static const char *	months [12]
static const ColorEntry	color_table []

Detailed Description

misc parsing utilities

Definition in file parseutils.c.

Macro Definition Documentation

ALPHA_SEP

#define ALPHA_SEP   '@'

Definition at line 354 of file parseutils.c.

Function Documentation

av_parse_ratio()

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 45 of file parseutils.c.

Referenced by get_aspect_ratio(), new_output_stream(), and new_video_stream().

av_parse_video_size()

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 150 of file parseutils.c.

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

av_parse_video_rate()

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 181 of file parseutils.c.

Referenced by add_input_streams(), av_opt_is_set_to_default(), config_output(), create_stream(), dc1394_read_common(), dshow_read_header(), grab_read_header(), new_video_stream(), parse_manifest_representation(), rfc4175_parse_fmtp(), set_string_video_rate(), test_av_parse_video_rate(), v4l2_set_parameters(), and vfw_read_header().

color_table_compare()

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

static

Definition at line 349 of file parseutils.c.

Referenced by av_parse_color().

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 356 of file parseutils.c.

Referenced by av_opt_is_set_to_default(), config_input(), config_output(), config_video_output(), draw_curves(), draw_text(), html_color_parse(), init(), plot_freqs(), set_param(), set_string_color(), and test_av_parse_color().

av_get_known_color_name()

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 436 of file parseutils.c.

Referenced by show_colors(), and test_av_get_known_color_name().

date_get_num()

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

static

Definition at line 452 of file parseutils.c.

Referenced by av_small_strptime().

date_get_month()

static int date_get_month ( const char **  pp )

static

Definition at line 476 of file parseutils.c.

Referenced by av_small_strptime().

av_small_strptime()

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

Simplified version of strptime.

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().

The supported input field descriptors are listed below.

• 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'
• T: alias for 'H:M:S'
• %%: a literal ''

Returns

a pointer to the first character not processed in this function call. In case the input string contains more characters than required by the format string the return value points right after the last consumed input character. In case the whole input string is consumed the return value points to the null byte at the end of the string. On failure NULL is returned.

Definition at line 491 of file parseutils.c.

Referenced by av_parse_time(), av_small_strptime(), ftp_parse_date(), parse_set_cookie_expiry_time(), and test_av_small_strptime().

av_timegm()

time_t av_timegm

(

struct tm *

tm

)

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

Definition at line 570 of file parseutils.c.

Referenced by av_parse_time(), ftp_parse_date(), get_cookies(), get_duration(), get_pts(), get_utc_date_time_insec(), mxf_timestamp_to_int64(), parse_cookie(), and parse_expires().

av_parse_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 589 of file parseutils.c.

Referenced by av_opt_set(), concat_parse_script(), ff_parse_creation_time_metadata(), func_pts(), get_metadata_duration(), parse_adaptation_sets(), parse_interval(), parse_points(), parse_read_interval(), parse_time_or_die(), parse_times(), rtsp_parse_range_npt(), and test_av_parse_time().

av_find_info_tag()

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 753 of file parseutils.c.

Referenced by ff_rtp_set_remote_url(), ff_tls_open_underlying(), ff_udp_set_remote_url(), libsrt_open(), libsrt_setup(), parse_options(), rtp_open(), sap_write_header(), sctp_open(), set_options(), tcp_open(), test_av_find_info_tag(), and udp_open().

Variable Documentation

video_size_abbrs

const VideoSizeAbbr video_size_abbrs[]

static

Definition at line 76 of file parseutils.c.

Referenced by av_parse_video_size().

video_rate_abbrs

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 134 of file parseutils.c.

Referenced by av_parse_video_rate().

months

const char* months[12]

static

Initial value:

= {
    "january", "february", "march", "april", "may", "june", "july", "august",
    "september", "october", "november", "december"
}

Definition at line 145 of file parseutils.c.

Referenced by date_get_month().

color_table

const ColorEntry color_table[]

static

Definition at line 206 of file parseutils.c.

Referenced by av_get_known_color_name(), av_parse_color(), and test_av_get_known_color_name().