text: /*
   * This file is part of FFmpeg.
   *
   * FFmpeg is free software; you can redistribute it and/or
   * modify it under the terms of the GNU Lesser General Public
   * License as published by the Free Software Foundation; either
   * version 2.1 of the License, or (at your option) any later version.
   *
   * FFmpeg is distributed in the hope that it will be useful,
   * but WITHOUT ANY WARRANTY; without even the implied warranty of
   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   * Lesser General Public License for more details.
   *
   * You should have received a copy of the GNU Lesser General Public
   * License along with FFmpeg; if not, write to the Free Software
   * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
   */
  
  #ifndef AVUTIL_PARSEUTILS_H
  #define AVUTIL_PARSEUTILS_H
  
  #include <time.h>
  
  #include "rational.h"
  
  /**
   * @file
   * misc parsing utilities
   */
  
  /**
   * Parse str and put in width_ptr and height_ptr the detected values.
   *
   * @param[in,out] width_ptr pointer to the variable which will contain the detected
   * width value
   * @param[in,out] height_ptr pointer to the variable which will contain the detected
   * height value
   * @param[in] str the string to parse: it has to be a string in the format
   * width x height or a valid video size abbreviation.
   * @return >= 0 on success, a negative error code otherwise
   */
  int av_parse_video_size(int *width_ptr, int *height_ptr, const char *str);
  
  /**
   * Parse str and store the detected values in *rate.
   *
   * @param[in,out] rate pointer to the AVRational which will contain the detected
   * frame rate
   * @param[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
   * @return >= 0 on success, a negative error code otherwise
   */
  int av_parse_video_rate(AVRational *rate, const char *str);
  
  /**
   * Put the RGBA values that correspond to color_string in rgba_color.
   *
   * @param 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.
   * @param 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.
   * @return >= 0 in case of success, a negative value in case of
   * failure (for example if color_string cannot be parsed).
   */
  int av_parse_color(uint8_t *rgba_color, const char *color_string, int slen,
                     void *log_ctx);
  
  /**
   * Parses timestr and returns in *time a corresponding number of
   * microseconds.
   *
   * @param 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.
  
   * @param timestr a string representing a date or a duration.
   * - If a date the syntax is:
   * @code
   * [{YYYY-MM-DD|YYYYMMDD}[T|t| ]]{{HH[:MM[:SS[.m...]]]}|{HH[MM[SS[.m...]]]}}[Z]
   * now
   * @endcode
   * 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:
   * @code
   * [-]HH[:MM[:SS[.m...]]]
   * [-]S+[.m...]
   * @endcode
   * @param duration flag which tells how to interpret timestr, if not
   * zero timestr is interpreted as a duration, otherwise as a date
   * @return 0 in case of success, a negative value corresponding to an
   * AVERROR code otherwise
   */
  int av_parse_time(int64_t *timeval, const char *timestr, int duration);
  
  /**
   * Attempt to find a specific tag in a URL.
   *
   * syntax: '?tag1=val1&tag2=val2...'. Little URL decoding is done.
   * Return 1 if found.
   */
  int av_find_info_tag(char *arg, int arg_size, const char *tag1, const char *info);
  
  /**
   * Convert the decomposed UTC time in tm to a time_t value.
   */
  time_t av_timegm(struct tm *tm);
  
  #endif /* AVUTIL_PARSEUTILS_H */
  