194 lines
7.4 KiB
C
194 lines
7.4 KiB
C
/*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef AVUTIL_PARSEUTILS_H
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#define AVUTIL_PARSEUTILS_H
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#include <time.h>
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#include "rational.h"
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/**
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* @file
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* misc parsing utilities
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*/
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/**
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* Parse str and store the parsed ratio in q.
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*
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* Note that a ratio with infinite (1/0) or negative value is
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* considered valid, so you should check on the returned value if you
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* want to exclude those values.
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*
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* The undefined value can be expressed using the "0:0" string.
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*
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* @param[in,out] q pointer to the AVRational which will contain the ratio
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* @param[in] str the string to parse: it has to be a string in the format
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* num:den, a float number or an expression
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* @param[in] max the maximum allowed numerator and denominator
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* @param[in] log_offset log level offset which is applied to the log
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* level of log_ctx
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* @param[in] log_ctx parent logging context
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* @return >= 0 on success, a negative error code otherwise
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*/
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int av_parse_ratio(AVRational *q, const char *str, int max,
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int log_offset, void *log_ctx);
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#define av_parse_ratio_quiet(rate, str, max) \
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av_parse_ratio(rate, str, max, AV_LOG_MAX_OFFSET, NULL)
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/**
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* Parse str and put in width_ptr and height_ptr the detected values.
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*
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* @param[in,out] width_ptr pointer to the variable which will contain the detected
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* width value
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* @param[in,out] height_ptr pointer to the variable which will contain the detected
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* height value
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* @param[in] str the string to parse: it has to be a string in the format
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* width x height or a valid video size abbreviation.
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* @return >= 0 on success, a negative error code otherwise
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*/
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int av_parse_video_size(int *width_ptr, int *height_ptr, const char *str);
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/**
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* Parse str and store the detected values in *rate.
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*
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* @param[in,out] rate pointer to the AVRational which will contain the detected
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* frame rate
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* @param[in] str the string to parse: it has to be a string in the format
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* rate_num / rate_den, a float number or a valid video rate abbreviation
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* @return >= 0 on success, a negative error code otherwise
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*/
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int av_parse_video_rate(AVRational *rate, const char *str);
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/**
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* Put the RGBA values that correspond to color_string in rgba_color.
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*
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* @param color_string a string specifying a color. It can be the name of
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* a color (case insensitive match) or a [0x|#]RRGGBB[AA] sequence,
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* possibly followed by "@" and a string representing the alpha
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* component.
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* The alpha component may be a string composed by "0x" followed by an
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* hexadecimal number or a decimal number between 0.0 and 1.0, which
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* represents the opacity value (0x00/0.0 means completely transparent,
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* 0xff/1.0 completely opaque).
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* If the alpha component is not specified then 0xff is assumed.
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* The string "random" will result in a random color.
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* @param slen length of the initial part of color_string containing the
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* color. It can be set to -1 if color_string is a null terminated string
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* containing nothing else than the color.
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* @return >= 0 in case of success, a negative value in case of
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* failure (for example if color_string cannot be parsed).
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*/
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int av_parse_color(uint8_t *rgba_color, const char *color_string, int slen,
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void *log_ctx);
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/**
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* Get the name of a color from the internal table of hard-coded named
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* colors.
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*
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* This function is meant to enumerate the color names recognized by
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* av_parse_color().
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*
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* @param color_idx index of the requested color, starting from 0
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* @param rgbp if not NULL, will point to a 3-elements array with the color value in RGB
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* @return the color name string or NULL if color_idx is not in the array
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*/
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const char *av_get_known_color_name(int color_idx, const uint8_t **rgb);
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/**
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* Parse timestr and return in *time a corresponding number of
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* microseconds.
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*
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* @param timeval puts here the number of microseconds corresponding
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* to the string in timestr. If the string represents a duration, it
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* is the number of microseconds contained in the time interval. If
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* the string is a date, is the number of microseconds since 1st of
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* January, 1970 up to the time of the parsed date. If timestr cannot
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* be successfully parsed, set *time to INT64_MIN.
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* @param timestr a string representing a date or a duration.
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* - If a date the syntax is:
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* @code
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* [{YYYY-MM-DD|YYYYMMDD}[T|t| ]]{{HH:MM:SS[.m...]]]}|{HHMMSS[.m...]]]}}[Z]
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* now
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* @endcode
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* If the value is "now" it takes the current time.
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* Time is local time unless Z is appended, in which case it is
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* interpreted as UTC.
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* If the year-month-day part is not specified it takes the current
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* year-month-day.
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* - If a duration the syntax is:
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* @code
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* [-][HH:]MM:SS[.m...]
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* [-]S+[.m...]
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* @endcode
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* @param duration flag which tells how to interpret timestr, if not
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* zero timestr is interpreted as a duration, otherwise as a date
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* @return >= 0 in case of success, a negative value corresponding to an
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* AVERROR code otherwise
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*/
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int av_parse_time(int64_t *timeval, const char *timestr, int duration);
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/**
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* Attempt to find a specific tag in a URL.
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*
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* syntax: '?tag1=val1&tag2=val2...'. Little URL decoding is done.
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* Return 1 if found.
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*/
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int av_find_info_tag(char *arg, int arg_size, const char *tag1, const char *info);
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/**
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* Simplified version of strptime
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*
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* Parse the input string p according to the format string fmt and
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* store its results in the structure dt.
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* This implementation supports only a subset of the formats supported
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* by the standard strptime().
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*
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* The supported input field descriptors are listed below.
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* - %H: the hour as a decimal number, using a 24-hour clock, in the
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* range '00' through '23'
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* - %J: hours as a decimal number, in the range '0' through INT_MAX
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* - %M: the minute as a decimal number, using a 24-hour clock, in the
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* range '00' through '59'
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* - %S: the second as a decimal number, using a 24-hour clock, in the
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* range '00' through '59'
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* - %Y: the year as a decimal number, using the Gregorian calendar
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* - %m: the month as a decimal number, in the range '1' through '12'
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* - %d: the day of the month as a decimal number, in the range '1'
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* through '31'
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* - %T: alias for '%H:%M:%S'
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* - %%: a literal '%'
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*
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* @return a pointer to the first character not processed in this function
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* call. In case the input string contains more characters than
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* required by the format string the return value points right after
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* the last consumed input character. In case the whole input string
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* is consumed the return value points to the null byte at the end of
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* the string. On failure NULL is returned.
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*/
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char *av_small_strptime(const char *p, const char *fmt, struct tm *dt);
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/**
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* Convert the decomposed UTC time in tm to a time_t value.
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*/
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time_t av_timegm(struct tm *tm);
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#endif /* AVUTIL_PARSEUTILS_H */
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