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2134
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1 /*
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2 * This file is part of FFmpeg.
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3 *
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4 * FFmpeg is free software; you can redistribute it and/or
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5 * modify it under the terms of the GNU Lesser General Public
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6 * License as published by the Free Software Foundation; either
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7 * version 2.1 of the License, or (at your option) any later version.
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8 *
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9 * FFmpeg is distributed in the hope that it will be useful,
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10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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12 * Lesser General Public License for more details.
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13 *
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14 * You should have received a copy of the GNU Lesser General Public
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15 * License along with FFmpeg; if not, write to the Free Software
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16 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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17 */
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18
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19 #ifndef AVUTIL_PARSEUTILS_H
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20 #define AVUTIL_PARSEUTILS_H
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21
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22 #include <time.h>
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23
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24 #include "rational.h"
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25
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26 /**
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27 * @file
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28 * misc parsing utilities
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29 */
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30
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31 /**
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32 * Parse str and store the parsed ratio in q.
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33 *
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34 * Note that a ratio with infinite (1/0) or negative value is
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35 * considered valid, so you should check on the returned value if you
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36 * want to exclude those values.
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37 *
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38 * The undefined value can be expressed using the "0:0" string.
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39 *
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40 * @param[in,out] q pointer to the AVRational which will contain the ratio
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41 * @param[in] str the string to parse: it has to be a string in the format
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42 * num:den, a float number or an expression
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43 * @param[in] max the maximum allowed numerator and denominator
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44 * @param[in] log_offset log level offset which is applied to the log
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45 * level of log_ctx
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46 * @param[in] log_ctx parent logging context
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47 * @return >= 0 on success, a negative error code otherwise
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48 */
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49 int av_parse_ratio(AVRational *q, const char *str, int max,
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50 int log_offset, void *log_ctx);
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51
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52 #define av_parse_ratio_quiet(rate, str, max) \
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53 av_parse_ratio(rate, str, max, AV_LOG_MAX_OFFSET, NULL)
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54
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55 /**
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56 * Parse str and put in width_ptr and height_ptr the detected values.
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57 *
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58 * @param[in,out] width_ptr pointer to the variable which will contain the detected
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59 * width value
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60 * @param[in,out] height_ptr pointer to the variable which will contain the detected
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61 * height value
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62 * @param[in] str the string to parse: it has to be a string in the format
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63 * width x height or a valid video size abbreviation.
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64 * @return >= 0 on success, a negative error code otherwise
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65 */
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66 int av_parse_video_size(int *width_ptr, int *height_ptr, const char *str);
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67
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68 /**
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69 * Parse str and store the detected values in *rate.
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70 *
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71 * @param[in,out] rate pointer to the AVRational which will contain the detected
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72 * frame rate
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73 * @param[in] str the string to parse: it has to be a string in the format
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74 * rate_num / rate_den, a float number or a valid video rate abbreviation
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75 * @return >= 0 on success, a negative error code otherwise
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76 */
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77 int av_parse_video_rate(AVRational *rate, const char *str);
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78
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79 /**
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80 * Put the RGBA values that correspond to color_string in rgba_color.
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81 *
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82 * @param color_string a string specifying a color. It can be the name of
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83 * a color (case insensitive match) or a [0x|#]RRGGBB[AA] sequence,
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84 * possibly followed by "@" and a string representing the alpha
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85 * component.
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86 * The alpha component may be a string composed by "0x" followed by an
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87 * hexadecimal number or a decimal number between 0.0 and 1.0, which
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88 * represents the opacity value (0x00/0.0 means completely transparent,
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89 * 0xff/1.0 completely opaque).
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90 * If the alpha component is not specified then 0xff is assumed.
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91 * The string "random" will result in a random color.
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92 * @param slen length of the initial part of color_string containing the
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93 * color. It can be set to -1 if color_string is a null terminated string
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94 * containing nothing else than the color.
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95 * @return >= 0 in case of success, a negative value in case of
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96 * failure (for example if color_string cannot be parsed).
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97 */
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98 int av_parse_color(uint8_t *rgba_color, const char *color_string, int slen,
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99 void *log_ctx);
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100
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101 /**
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102 * Parse timestr and return in *time a corresponding number of
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103 * microseconds.
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104 *
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105 * @param timeval puts here the number of microseconds corresponding
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106 * to the string in timestr. If the string represents a duration, it
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107 * is the number of microseconds contained in the time interval. If
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108 * the string is a date, is the number of microseconds since 1st of
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109 * January, 1970 up to the time of the parsed date. If timestr cannot
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110 * be successfully parsed, set *time to INT64_MIN.
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111
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112 * @param timestr a string representing a date or a duration.
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113 * - If a date the syntax is:
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114 * @code
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115 * [{YYYY-MM-DD|YYYYMMDD}[T|t| ]]{{HH:MM:SS[.m...]]]}|{HHMMSS[.m...]]]}}[Z]
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116 * now
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117 * @endcode
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118 * If the value is "now" it takes the current time.
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119 * Time is local time unless Z is appended, in which case it is
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120 * interpreted as UTC.
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121 * If the year-month-day part is not specified it takes the current
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122 * year-month-day.
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123 * - If a duration the syntax is:
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124 * @code
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125 * [-][HH:]MM:SS[.m...]
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126 * [-]S+[.m...]
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127 * @endcode
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128 * @param duration flag which tells how to interpret timestr, if not
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129 * zero timestr is interpreted as a duration, otherwise as a date
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130 * @return 0 in case of success, a negative value corresponding to an
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131 * AVERROR code otherwise
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132 */
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133 int av_parse_time(int64_t *timeval, const char *timestr, int duration);
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134
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135 /**
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136 * Parse the input string p according to the format string fmt and
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137 * store its results in the structure dt.
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138 * This implementation supports only a subset of the formats supported
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139 * by the standard strptime().
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140 *
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141 * In particular it actually supports the parameters:
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142 * - %H: the hour as a decimal number, using a 24-hour clock, in the
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143 * range '00' through '23'
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144 * - %J: hours as a decimal number, in the range '0' through INT_MAX
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145 * - %M: the minute as a decimal number, using a 24-hour clock, in the
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146 * range '00' through '59'
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147 * - %S: the second as a decimal number, using a 24-hour clock, in the
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148 * range '00' through '59'
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149 * - %Y: the year as a decimal number, using the Gregorian calendar
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150 * - %m: the month as a decimal number, in the range '1' through '12'
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151 * - %d: the day of the month as a decimal number, in the range '1'
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152 * through '31'
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153 * - %%: a literal '%'
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154 *
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155 * @return a pointer to the first character not processed in this
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156 * function call, or NULL in case the function fails to match all of
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157 * the fmt string and therefore an error occurred
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158 */
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159 char *av_small_strptime(const char *p, const char *fmt, struct tm *dt);
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160
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161 /**
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162 * Attempt to find a specific tag in a URL.
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163 *
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164 * syntax: '?tag1=val1&tag2=val2...'. Little URL decoding is done.
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165 * Return 1 if found.
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166 */
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167 int av_find_info_tag(char *arg, int arg_size, const char *tag1, const char *info);
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168
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169 /**
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170 * Convert the decomposed UTC time in tm to a time_t value.
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171 */
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172 time_t av_timegm(struct tm *tm);
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173
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174 #endif /* AVUTIL_PARSEUTILS_H */
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