libavutil/parseutils.c

   1 /*
   2  * This file is part of FFmpeg.
   3  *
   4  * FFmpeg is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU Lesser General Public
   6  * License as published by the Free Software Foundation; either
   7  * version 2.1 of the License, or (at your option) any later version.
   8  *
   9  * FFmpeg is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * Lesser General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU Lesser General Public
  15  * License along with FFmpeg; if not, write to the Free Software
  16  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  17  */
  18
  19 /**
  20  * @file
  21  * misc parsing utilities
  22  */
  23
  24 #include <time.h>
  25
  26 #include "avstring.h"
  27 #include "avutil.h"
  28 #include "common.h"
  29 #include "eval.h"
  30 #include "log.h"
  31 #include "random_seed.h"
  32 #include "time_internal.h"
  33 #include "parseutils.h"
  34 #include "time.h"
  35
  36 #ifdef TEST
  37
  38 #define av_get_random_seed av_get_random_seed_deterministic
  39 static uint32_t av_get_random_seed_deterministic(void);
  40
  41 #define av_gettime() 1331972053200000
  42
  43 #endif
  44
  45 int av_parse_ratio(AVRational *q, const char *str, int max,
  46                    int log_offset, void *log_ctx)
  47 {
  48     char c;
  49     int ret;
  50
  51     if (sscanf(str, "%d:%d%c", &q->num, &q->den, &c) != 2) {
  52         double d;
  53         ret = av_expr_parse_and_eval(&d, str, NULL, NULL,
  54                                      NULL, NULL, NULL, NULL,
  55                                      NULL, log_offset, log_ctx);
  56         if (ret < 0)
  57             return ret;
  58         *q = av_d2q(d, max);
  59     } else {
  60         av_reduce(&q->num, &q->den, q->num, q->den, max);
  61     }
  62
  63     return 0;
  64 }
  65
  66 typedef struct VideoSizeAbbr {
  67     const char *abbr;
  68     int width, height;
  69 } VideoSizeAbbr;
  70
  71 typedef struct VideoRateAbbr {
  72     const char *abbr;
  73     AVRational rate;
  74 } VideoRateAbbr;
  75
  76 static const VideoSizeAbbr video_size_abbrs[] = {
  77     { "ntsc",      720, 480 },
  78     { "pal",       720, 576 },
  79     { "qntsc",     352, 240 }, /* VCD compliant NTSC */
  80     { "qpal",      352, 288 }, /* VCD compliant PAL */
  81     { "sntsc",     640, 480 }, /* square pixel NTSC */
  82     { "spal",      768, 576 }, /* square pixel PAL */
  83     { "film",      352, 240 },
  84     { "ntsc-film", 352, 240 },
  85     { "sqcif",     128,  96 },
  86     { "qcif",      176, 144 },
  87     { "cif",       352, 288 },
  88     { "4cif",      704, 576 },
  89     { "16cif",    1408,1152 },
  90     { "qqvga",     160, 120 },
  91     { "qvga",      320, 240 },
  92     { "vga",       640, 480 },
  93     { "svga",      800, 600 },
  94     { "xga",      1024, 768 },
  95     { "uxga",     1600,1200 },
  96     { "qxga",     2048,1536 },
  97     { "sxga",     1280,1024 },
  98     { "qsxga",    2560,2048 },
  99     { "hsxga",    5120,4096 },
 100     { "wvga",      852, 480 },
 101     { "wxga",     1366, 768 },
 102     { "wsxga",    1600,1024 },
 103     { "wuxga",    1920,1200 },
 104     { "woxga",    2560,1600 },
 105     { "wqhd",     2560,1440 },
 106     { "wqsxga",   3200,2048 },
 107     { "wquxga",   3840,2400 },
 108     { "whsxga",   6400,4096 },
 109     { "whuxga",   7680,4800 },
 110     { "cga",       320, 200 },
 111     { "ega",       640, 350 },
 112     { "hd480",     852, 480 },
 113     { "hd720",    1280, 720 },
 114     { "hd1080",   1920,1080 },
 115     { "quadhd",   2560,1440 },
 116     { "2k",       2048,1080 }, /* Digital Cinema System Specification */
 117     { "2kdci",    2048,1080 },
 118     { "2kflat",   1998,1080 },
 119     { "2kscope",  2048, 858 },
 120     { "4k",       4096,2160 }, /* Digital Cinema System Specification */
 121     { "4kdci",    4096,2160 },
 122     { "4kflat",   3996,2160 },
 123     { "4kscope",  4096,1716 },
 124     { "nhd",       640,360  },
 125     { "hqvga",     240,160  },
 126     { "wqvga",     400,240  },
 127     { "fwqvga",    432,240  },
 128     { "hvga",      480,320  },
 129     { "qhd",       960,540  },
 130     { "uhd2160",  3840,2160 },
 131     { "uhd4320",  7680,4320 },
 132 };
 133
 134 static const VideoRateAbbr video_rate_abbrs[]= {
 135     { "ntsc",      { 30000, 1001 } },
 136     { "pal",       {    25,    1 } },
 137     { "qntsc",     { 30000, 1001 } }, /* VCD compliant NTSC */
 138     { "qpal",      {    25,    1 } }, /* VCD compliant PAL */
 139     { "sntsc",     { 30000, 1001 } }, /* square pixel NTSC */
 140     { "spal",      {    25,    1 } }, /* square pixel PAL */
 141     { "film",      {    24,    1 } },
 142     { "ntsc-film", { 24000, 1001 } },
 143 };
 144
 145 static const char *months[12] = {
 146     "january", "february", "march", "april", "may", "june", "july", "august",
 147     "september", "october", "november", "december"
 148 };
 149
 150 int av_parse_video_size(int *width_ptr, int *height_ptr, const char *str)
 151 {
 152     int i;
 153     int n = FF_ARRAY_ELEMS(video_size_abbrs);
 154     const char *p;
 155     int width = 0, height = 0;
 156
 157     for (i = 0; i < n; i++) {
 158         if (!strcmp(video_size_abbrs[i].abbr, str)) {
 159             width  = video_size_abbrs[i].width;
 160             height = video_size_abbrs[i].height;
 161             break;
 162         }
 163     }
 164     if (i == n) {
 165         width = strtol(str, (void*)&p, 10);
 166         if (*p)
 167             p++;
 168         height = strtol(p, (void*)&p, 10);
 169
 170         /* trailing extraneous data detected, like in 123x345foobar */
 171         if (*p)
 172             return AVERROR(EINVAL);
 173     }
 174     if (width <= 0 || height <= 0)
 175         return AVERROR(EINVAL);
 176     *width_ptr  = width;
 177     *height_ptr = height;
 178     return 0;
 179 }
 180
 181 int av_parse_video_rate(AVRational *rate, const char *arg)
 182 {
 183     int i, ret;
 184     int n = FF_ARRAY_ELEMS(video_rate_abbrs);
 185
 186     /* First, we check our abbreviation table */
 187     for (i = 0; i < n; ++i)
 188         if (!strcmp(video_rate_abbrs[i].abbr, arg)) {
 189             *rate = video_rate_abbrs[i].rate;
 190             return 0;
 191         }
 192
 193     /* Then, we try to parse it as fraction */
 194     if ((ret = av_parse_ratio_quiet(rate, arg, 1001000)) < 0)
 195         return ret;
 196     if (!rate->num || !rate->den)
 197         if ((ret = av_parse_ratio_quiet(rate, arg, INT_MAX)) < 0)
 198             return ret;
 199     if (rate->num <= 0 || rate->den <= 0)
 200         return AVERROR(EINVAL);
 201     return 0;
 202 }
 203
 204 typedef struct ColorEntry {
 205     const char *name;            ///< a string representing the name of the color
 206     uint8_t     rgb_color[3];    ///< RGB values for the color
 207 } ColorEntry;
 208
 209 static const ColorEntry color_table[] = {
 210     { "AliceBlue",            { 0xF0, 0xF8, 0xFF } },
 211     { "AntiqueWhite",         { 0xFA, 0xEB, 0xD7 } },
 212     { "Aqua",                 { 0x00, 0xFF, 0xFF } },
 213     { "Aquamarine",           { 0x7F, 0xFF, 0xD4 } },
 214     { "Azure",                { 0xF0, 0xFF, 0xFF } },
 215     { "Beige",                { 0xF5, 0xF5, 0xDC } },
 216     { "Bisque",               { 0xFF, 0xE4, 0xC4 } },
 217     { "Black",                { 0x00, 0x00, 0x00 } },
 218     { "BlanchedAlmond",       { 0xFF, 0xEB, 0xCD } },
 219     { "Blue",                 { 0x00, 0x00, 0xFF } },
 220     { "BlueViolet",           { 0x8A, 0x2B, 0xE2 } },
 221     { "Brown",                { 0xA5, 0x2A, 0x2A } },
 222     { "BurlyWood",            { 0xDE, 0xB8, 0x87 } },
 223     { "CadetBlue",            { 0x5F, 0x9E, 0xA0 } },
 224     { "Chartreuse",           { 0x7F, 0xFF, 0x00 } },
 225     { "Chocolate",            { 0xD2, 0x69, 0x1E } },
 226     { "Coral",                { 0xFF, 0x7F, 0x50 } },
 227     { "CornflowerBlue",       { 0x64, 0x95, 0xED } },
 228     { "Cornsilk",             { 0xFF, 0xF8, 0xDC } },
 229     { "Crimson",              { 0xDC, 0x14, 0x3C } },
 230     { "Cyan",                 { 0x00, 0xFF, 0xFF } },
 231     { "DarkBlue",             { 0x00, 0x00, 0x8B } },
 232     { "DarkCyan",             { 0x00, 0x8B, 0x8B } },
 233     { "DarkGoldenRod",        { 0xB8, 0x86, 0x0B } },
 234     { "DarkGray",             { 0xA9, 0xA9, 0xA9 } },
 235     { "DarkGreen",            { 0x00, 0x64, 0x00 } },
 236     { "DarkKhaki",            { 0xBD, 0xB7, 0x6B } },
 237     { "DarkMagenta",          { 0x8B, 0x00, 0x8B } },
 238     { "DarkOliveGreen",       { 0x55, 0x6B, 0x2F } },
 239     { "Darkorange",           { 0xFF, 0x8C, 0x00 } },
 240     { "DarkOrchid",           { 0x99, 0x32, 0xCC } },
 241     { "DarkRed",              { 0x8B, 0x00, 0x00 } },
 242     { "DarkSalmon",           { 0xE9, 0x96, 0x7A } },
 243     { "DarkSeaGreen",         { 0x8F, 0xBC, 0x8F } },
 244     { "DarkSlateBlue",        { 0x48, 0x3D, 0x8B } },
 245     { "DarkSlateGray",        { 0x2F, 0x4F, 0x4F } },
 246     { "DarkTurquoise",        { 0x00, 0xCE, 0xD1 } },
 247     { "DarkViolet",           { 0x94, 0x00, 0xD3 } },
 248     { "DeepPink",             { 0xFF, 0x14, 0x93 } },
 249     { "DeepSkyBlue",          { 0x00, 0xBF, 0xFF } },
 250     { "DimGray",              { 0x69, 0x69, 0x69 } },
 251     { "DodgerBlue",           { 0x1E, 0x90, 0xFF } },
 252     { "FireBrick",            { 0xB2, 0x22, 0x22 } },
 253     { "FloralWhite",          { 0xFF, 0xFA, 0xF0 } },
 254     { "ForestGreen",          { 0x22, 0x8B, 0x22 } },
 255     { "Fuchsia",              { 0xFF, 0x00, 0xFF } },
 256     { "Gainsboro",            { 0xDC, 0xDC, 0xDC } },
 257     { "GhostWhite",           { 0xF8, 0xF8, 0xFF } },
 258     { "Gold",                 { 0xFF, 0xD7, 0x00 } },
 259     { "GoldenRod",            { 0xDA, 0xA5, 0x20 } },
 260     { "Gray",                 { 0x80, 0x80, 0x80 } },
 261     { "Green",                { 0x00, 0x80, 0x00 } },
 262     { "GreenYellow",          { 0xAD, 0xFF, 0x2F } },
 263     { "HoneyDew",             { 0xF0, 0xFF, 0xF0 } },
 264     { "HotPink",              { 0xFF, 0x69, 0xB4 } },
 265     { "IndianRed",            { 0xCD, 0x5C, 0x5C } },
 266     { "Indigo",               { 0x4B, 0x00, 0x82 } },
 267     { "Ivory",                { 0xFF, 0xFF, 0xF0 } },
 268     { "Khaki",                { 0xF0, 0xE6, 0x8C } },
 269     { "Lavender",             { 0xE6, 0xE6, 0xFA } },
 270     { "LavenderBlush",        { 0xFF, 0xF0, 0xF5 } },
 271     { "LawnGreen",            { 0x7C, 0xFC, 0x00 } },
 272     { "LemonChiffon",         { 0xFF, 0xFA, 0xCD } },
 273     { "LightBlue",            { 0xAD, 0xD8, 0xE6 } },
 274     { "LightCoral",           { 0xF0, 0x80, 0x80 } },
 275     { "LightCyan",            { 0xE0, 0xFF, 0xFF } },
 276     { "LightGoldenRodYellow", { 0xFA, 0xFA, 0xD2 } },
 277     { "LightGreen",           { 0x90, 0xEE, 0x90 } },
 278     { "LightGrey",            { 0xD3, 0xD3, 0xD3 } },
 279     { "LightPink",            { 0xFF, 0xB6, 0xC1 } },
 280     { "LightSalmon",          { 0xFF, 0xA0, 0x7A } },
 281     { "LightSeaGreen",        { 0x20, 0xB2, 0xAA } },
 282     { "LightSkyBlue",         { 0x87, 0xCE, 0xFA } },
 283     { "LightSlateGray",       { 0x77, 0x88, 0x99 } },
 284     { "LightSteelBlue",       { 0xB0, 0xC4, 0xDE } },
 285     { "LightYellow",          { 0xFF, 0xFF, 0xE0 } },
 286     { "Lime",                 { 0x00, 0xFF, 0x00 } },
 287     { "LimeGreen",            { 0x32, 0xCD, 0x32 } },
 288     { "Linen",                { 0xFA, 0xF0, 0xE6 } },
 289     { "Magenta",              { 0xFF, 0x00, 0xFF } },
 290     { "Maroon",               { 0x80, 0x00, 0x00 } },
 291     { "MediumAquaMarine",     { 0x66, 0xCD, 0xAA } },
 292     { "MediumBlue",           { 0x00, 0x00, 0xCD } },
 293     { "MediumOrchid",         { 0xBA, 0x55, 0xD3 } },
 294     { "MediumPurple",         { 0x93, 0x70, 0xD8 } },
 295     { "MediumSeaGreen",       { 0x3C, 0xB3, 0x71 } },
 296     { "MediumSlateBlue",      { 0x7B, 0x68, 0xEE } },
 297     { "MediumSpringGreen",    { 0x00, 0xFA, 0x9A } },
 298     { "MediumTurquoise",      { 0x48, 0xD1, 0xCC } },
 299     { "MediumVioletRed",      { 0xC7, 0x15, 0x85 } },
 300     { "MidnightBlue",         { 0x19, 0x19, 0x70 } },
 301     { "MintCream",            { 0xF5, 0xFF, 0xFA } },
 302     { "MistyRose",            { 0xFF, 0xE4, 0xE1 } },
 303     { "Moccasin",             { 0xFF, 0xE4, 0xB5 } },
 304     { "NavajoWhite",          { 0xFF, 0xDE, 0xAD } },
 305     { "Navy",                 { 0x00, 0x00, 0x80 } },
 306     { "OldLace",              { 0xFD, 0xF5, 0xE6 } },
 307     { "Olive",                { 0x80, 0x80, 0x00 } },
 308     { "OliveDrab",            { 0x6B, 0x8E, 0x23 } },
 309     { "Orange",               { 0xFF, 0xA5, 0x00 } },
 310     { "OrangeRed",            { 0xFF, 0x45, 0x00 } },
 311     { "Orchid",               { 0xDA, 0x70, 0xD6 } },
 312     { "PaleGoldenRod",        { 0xEE, 0xE8, 0xAA } },
 313     { "PaleGreen",            { 0x98, 0xFB, 0x98 } },
 314     { "PaleTurquoise",        { 0xAF, 0xEE, 0xEE } },
 315     { "PaleVioletRed",        { 0xD8, 0x70, 0x93 } },
 316     { "PapayaWhip",           { 0xFF, 0xEF, 0xD5 } },
 317     { "PeachPuff",            { 0xFF, 0xDA, 0xB9 } },
 318     { "Peru",                 { 0xCD, 0x85, 0x3F } },
 319     { "Pink",                 { 0xFF, 0xC0, 0xCB } },
 320     { "Plum",                 { 0xDD, 0xA0, 0xDD } },
 321     { "PowderBlue",           { 0xB0, 0xE0, 0xE6 } },
 322     { "Purple",               { 0x80, 0x00, 0x80 } },
 323     { "Red",                  { 0xFF, 0x00, 0x00 } },
 324     { "RosyBrown",            { 0xBC, 0x8F, 0x8F } },
 325     { "RoyalBlue",            { 0x41, 0x69, 0xE1 } },
 326     { "SaddleBrown",          { 0x8B, 0x45, 0x13 } },
 327     { "Salmon",               { 0xFA, 0x80, 0x72 } },
 328     { "SandyBrown",           { 0xF4, 0xA4, 0x60 } },
 329     { "SeaGreen",             { 0x2E, 0x8B, 0x57 } },
 330     { "SeaShell",             { 0xFF, 0xF5, 0xEE } },
 331     { "Sienna",               { 0xA0, 0x52, 0x2D } },
 332     { "Silver",               { 0xC0, 0xC0, 0xC0 } },
 333     { "SkyBlue",              { 0x87, 0xCE, 0xEB } },
 334     { "SlateBlue",            { 0x6A, 0x5A, 0xCD } },
 335     { "SlateGray",            { 0x70, 0x80, 0x90 } },
 336     { "Snow",                 { 0xFF, 0xFA, 0xFA } },
 337     { "SpringGreen",          { 0x00, 0xFF, 0x7F } },
 338     { "SteelBlue",            { 0x46, 0x82, 0xB4 } },
 339     { "Tan",                  { 0xD2, 0xB4, 0x8C } },
 340     { "Teal",                 { 0x00, 0x80, 0x80 } },
 341     { "Thistle",              { 0xD8, 0xBF, 0xD8 } },
 342     { "Tomato",               { 0xFF, 0x63, 0x47 } },
 343     { "Turquoise",            { 0x40, 0xE0, 0xD0 } },
 344     { "Violet",               { 0xEE, 0x82, 0xEE } },
 345     { "Wheat",                { 0xF5, 0xDE, 0xB3 } },
 346     { "White",                { 0xFF, 0xFF, 0xFF } },
 347     { "WhiteSmoke",           { 0xF5, 0xF5, 0xF5 } },
 348     { "Yellow",               { 0xFF, 0xFF, 0x00 } },
 349     { "YellowGreen",          { 0x9A, 0xCD, 0x32 } },
 350 };
 351
 352 static int color_table_compare(const void *lhs, const void *rhs)
 353 {
 354     return av_strcasecmp(lhs, ((const ColorEntry *)rhs)->name);
 355 }
 356
 357 #define ALPHA_SEP '@'
 358
 359 int av_parse_color(uint8_t *rgba_color, const char *color_string, int slen,
 360                    void *log_ctx)
 361 {
 362     char *tail, color_string2[128];
 363     const ColorEntry *entry;
 364     int len, hex_offset = 0;
 365
 366     if (color_string[0] == '#') {
 367         hex_offset = 1;
 368     } else if (!strncmp(color_string, "0x", 2))
 369         hex_offset = 2;
 370
 371     if (slen < 0)
 372         slen = strlen(color_string);
 373     av_strlcpy(color_string2, color_string + hex_offset,
 374                FFMIN(slen-hex_offset+1, sizeof(color_string2)));
 375     if ((tail = strchr(color_string2, ALPHA_SEP)))
 376         *tail++ = 0;
 377     len = strlen(color_string2);
 378     rgba_color[3] = 255;
 379
 380     if (!av_strcasecmp(color_string2, "random") || !av_strcasecmp(color_string2, "bikeshed")) {
 381         int rgba = av_get_random_seed();
 382         rgba_color[0] = rgba >> 24;
 383         rgba_color[1] = rgba >> 16;
 384         rgba_color[2] = rgba >> 8;
 385         rgba_color[3] = rgba;
 386     } else if (hex_offset ||
 387                strspn(color_string2, "0123456789ABCDEFabcdef") == len) {
 388         char *tail;
 389         unsigned int rgba = strtoul(color_string2, &tail, 16);
 390
 391         if (*tail || (len != 6 && len != 8)) {
 392             av_log(log_ctx, AV_LOG_ERROR, "Invalid 0xRRGGBB[AA] color string: '%s'\n", color_string2);
 393             return AVERROR(EINVAL);
 394         }
 395         if (len == 8) {
 396             rgba_color[3] = rgba;
 397             rgba >>= 8;
 398         }
 399         rgba_color[0] = rgba >> 16;
 400         rgba_color[1] = rgba >> 8;
 401         rgba_color[2] = rgba;
 402     } else {
 403         entry = bsearch(color_string2,
 404                         color_table,
 405                         FF_ARRAY_ELEMS(color_table),
 406                         sizeof(ColorEntry),
 407                         color_table_compare);
 408         if (!entry) {
 409             av_log(log_ctx, AV_LOG_ERROR, "Cannot find color '%s'\n", color_string2);
 410             return AVERROR(EINVAL);
 411         }
 412         memcpy(rgba_color, entry->rgb_color, 3);
 413     }
 414
 415     if (tail) {
 416         double alpha;
 417         const char *alpha_string = tail;
 418         if (!strncmp(alpha_string, "0x", 2)) {
 419             alpha = strtoul(alpha_string, &tail, 16);
 420         } else {
 421             double norm_alpha = strtod(alpha_string, &tail);
 422             if (norm_alpha < 0.0 || norm_alpha > 1.0)
 423                 alpha = 256;
 424             else
 425                 alpha = 255 * norm_alpha;
 426         }
 427
 428         if (tail == alpha_string || *tail || alpha > 255 || alpha < 0) {
 429             av_log(log_ctx, AV_LOG_ERROR, "Invalid alpha value specifier '%s' in '%s'\n",
 430                    alpha_string, color_string);
 431             return AVERROR(EINVAL);
 432         }
 433         rgba_color[3] = alpha;
 434     }
 435
 436     return 0;
 437 }
 438
 439 const char *av_get_known_color_name(int color_idx, const uint8_t **rgbp)
 440 {
 441     const ColorEntry *color;
 442
 443     if ((unsigned)color_idx >= FF_ARRAY_ELEMS(color_table))
 444         return NULL;
 445
 446     color = &color_table[color_idx];
 447     if (rgbp)
 448         *rgbp = color->rgb_color;
 449
 450     return color->name;
 451 }
 452
 453 /* get a positive number between n_min and n_max, for a maximum length
 454    of len_max. Return -1 if error. */
 455 static int date_get_num(const char **pp,
 456                         int n_min, int n_max, int len_max)
 457 {
 458     int i, val, c;
 459     const char *p;
 460
 461     p = *pp;
 462     val = 0;
 463     for(i = 0; i < len_max; i++) {
 464         c = *p;
 465         if (!av_isdigit(c))
 466             break;
 467         val = (val * 10) + c - '0';
 468         p++;
 469     }
 470     /* no number read ? */
 471     if (p == *pp)
 472         return -1;
 473     if (val < n_min || val > n_max)
 474         return -1;
 475     *pp = p;
 476     return val;
 477 }
 478
 479 static int date_get_month(const char **pp) {
 480     int i = 0;
 481     for (; i < 12; i++) {
 482         if (!av_strncasecmp(*pp, months[i], 3)) {
 483             const char *mo_full = months[i] + 3;
 484             int len = strlen(mo_full);
 485             *pp += 3;
 486             if (len > 0 && !av_strncasecmp(*pp, mo_full, len))
 487                 *pp += len;
 488             return i;
 489         }
 490     }
 491     return -1;
 492 }
 493
 494 char *av_small_strptime(const char *p, const char *fmt, struct tm *dt)
 495 {
 496     int c, val;
 497
 498     while((c = *fmt++)) {
 499         if (c != '%') {
 500             if (av_isspace(c))
 501                 for (; *p && av_isspace(*p); p++);
 502             else if (*p != c)
 503                 return NULL;
 504             else p++;
 505             continue;
 506         }
 507
 508         c = *fmt++;
 509         switch(c) {
 510         case 'H':
 511         case 'J':
 512             val = date_get_num(&p, 0, c == 'H' ? 23 : INT_MAX, c == 'H' ? 2 : 4);
 513
 514             if (val == -1)
 515                 return NULL;
 516             dt->tm_hour = val;
 517             break;
 518         case 'M':
 519             val = date_get_num(&p, 0, 59, 2);
 520             if (val == -1)
 521                 return NULL;
 522             dt->tm_min = val;
 523             break;
 524         case 'S':
 525             val = date_get_num(&p, 0, 59, 2);
 526             if (val == -1)
 527                 return NULL;
 528             dt->tm_sec = val;
 529             break;
 530         case 'Y':
 531             val = date_get_num(&p, 0, 9999, 4);
 532             if (val == -1)
 533                 return NULL;
 534             dt->tm_year = val - 1900;
 535             break;
 536         case 'm':
 537             val = date_get_num(&p, 1, 12, 2);
 538             if (val == -1)
 539                 return NULL;
 540             dt->tm_mon = val - 1;
 541             break;
 542         case 'd':
 543             val = date_get_num(&p, 1, 31, 2);
 544             if (val == -1)
 545                 return NULL;
 546             dt->tm_mday = val;
 547             break;
 548         case 'T':
 549             p = av_small_strptime(p, "%H:%M:%S", dt);
 550             if (!p)
 551                 return NULL;
 552             break;
 553         case 'b':
 554         case 'B':
 555         case 'h':
 556             val = date_get_month(&p);
 557             if (val == -1)
 558                 return NULL;
 559             dt->tm_mon = val;
 560             break;
 561         case '%':
 562             if (*p++ != '%')
 563                 return NULL;
 564             break;
 565         default:
 566             return NULL;
 567         }
 568     }
 569
 570     return (char*)p;
 571 }
 572
 573 time_t av_timegm(struct tm *tm)
 574 {
 575     time_t t;
 576
 577     int y = tm->tm_year + 1900, m = tm->tm_mon + 1, d = tm->tm_mday;
 578
 579     if (m < 3) {
 580         m += 12;
 581         y--;
 582     }
 583
 584     t = 86400LL *
 585         (d + (153 * m - 457) / 5 + 365 * y + y / 4 - y / 100 + y / 400 - 719469);
 586
 587     t += 3600 * tm->tm_hour + 60 * tm->tm_min + tm->tm_sec;
 588
 589     return t;
 590 }
 591
 592 int av_parse_time(int64_t *timeval, const char *timestr, int duration)
 593 {
 594     const char *p, *q;
 595     int64_t t, now64;
 596     time_t now;
 597     struct tm dt = { 0 }, tmbuf;
 598     int today = 0, negative = 0, microseconds = 0, suffix = 1000000;
 599     int i;
 600     static const char * const date_fmt[] = {
 601         "%Y - %m - %d",
 602         "%Y%m%d",
 603     };
 604     static const char * const time_fmt[] = {
 605         "%H:%M:%S",
 606         "%H%M%S",
 607     };
 608     static const char * const tz_fmt[] = {
 609         "%H:%M",
 610         "%H%M",
 611         "%H",
 612     };
 613
 614     p = timestr;
 615     q = NULL;
 616     *timeval = INT64_MIN;
 617     if (!duration) {
 618         now64 = av_gettime();
 619         now = now64 / 1000000;
 620
 621         if (!av_strcasecmp(timestr, "now")) {
 622             *timeval = now64;
 623             return 0;
 624         }
 625
 626         /* parse the year-month-day part */
 627         for (i = 0; i < FF_ARRAY_ELEMS(date_fmt); i++) {
 628             q = av_small_strptime(p, date_fmt[i], &dt);
 629             if (q)
 630                 break;
 631         }
 632
 633         /* if the year-month-day part is missing, then take the
 634          * current year-month-day time */
 635         if (!q) {
 636             today = 1;
 637             q = p;
 638         }
 639         p = q;
 640
 641         if (*p == 'T' || *p == 't')
 642             p++;
 643         else
 644             while (av_isspace(*p))
 645                 p++;
 646
 647         /* parse the hour-minute-second part */
 648         for (i = 0; i < FF_ARRAY_ELEMS(time_fmt); i++) {
 649             q = av_small_strptime(p, time_fmt[i], &dt);
 650             if (q)
 651                 break;
 652         }
 653     } else {
 654         /* parse timestr as a duration */
 655         if (p[0] == '-') {
 656             negative = 1;
 657             ++p;
 658         }
 659         /* parse timestr as HH:MM:SS */
 660         q = av_small_strptime(p, "%J:%M:%S", &dt);
 661         if (!q) {
 662             /* parse timestr as MM:SS */
 663             q = av_small_strptime(p, "%M:%S", &dt);
 664             dt.tm_hour = 0;
 665         }
 666         if (!q) {
 667             char *o;
 668             /* parse timestr as S+ */
 669             errno = 0;
 670             t = strtoll(p, &o, 10);
 671             if (o == p) /* the parsing didn't succeed */
 672                 return AVERROR(EINVAL);
 673             if (errno == ERANGE)
 674                 return AVERROR(ERANGE);
 675             q = o;
 676         } else {
 677             t = dt.tm_hour * 3600 + dt.tm_min * 60 + dt.tm_sec;
 678         }
 679     }
 680
 681     /* Now we have all the fields that we can get */
 682     if (!q)
 683         return AVERROR(EINVAL);
 684
 685     /* parse the .m... part */
 686     if (*q == '.') {
 687         int n;
 688         q++;
 689         for (n = 100000; n >= 1; n /= 10, q++) {
 690             if (!av_isdigit(*q))
 691                 break;
 692             microseconds += n * (*q - '0');
 693         }
 694         while (av_isdigit(*q))
 695             q++;
 696     }
 697
 698     if (duration) {
 699         if (q[0] == 'm' && q[1] == 's') {
 700             suffix = 1000;
 701             microseconds /= 1000;
 702             q += 2;
 703         } else if (q[0] == 'u' && q[1] == 's') {
 704             suffix = 1;
 705             microseconds = 0;
 706             q += 2;
 707         } else if (*q == 's')
 708             q++;
 709     } else {
 710         int is_utc = *q == 'Z' || *q == 'z';
 711         int tzoffset = 0;
 712         q += is_utc;
 713         if (!today && !is_utc && (*q == '+' || *q == '-')) {
 714             struct tm tz = { 0 };
 715             int sign = (*q == '+' ? -1 : 1);
 716             q++;
 717             p = q;
 718             for (i = 0; i < FF_ARRAY_ELEMS(tz_fmt); i++) {
 719                 q = av_small_strptime(p, tz_fmt[i], &tz);
 720                 if (q)
 721                     break;
 722             }
 723             if (!q)
 724                 return AVERROR(EINVAL);
 725             tzoffset = sign * (tz.tm_hour * 60 + tz.tm_min) * 60;
 726             is_utc = 1;
 727         }
 728         if (today) { /* fill in today's date */
 729             struct tm dt2 = is_utc ? *gmtime_r(&now, &tmbuf) : *localtime_r(&now, &tmbuf);
 730             dt2.tm_hour = dt.tm_hour;
 731             dt2.tm_min  = dt.tm_min;
 732             dt2.tm_sec  = dt.tm_sec;
 733             dt = dt2;
 734         }
 735         dt.tm_isdst = is_utc ? 0 : -1;
 736         t = is_utc ? av_timegm(&dt) : mktime(&dt);
 737         t += tzoffset;
 738     }
 739
 740     /* Check that we are at the end of the string */
 741     if (*q)
 742         return AVERROR(EINVAL);
 743
 744     if (INT64_MAX / suffix < t || t < INT64_MIN / suffix)
 745         return AVERROR(ERANGE);
 746     t *= suffix;
 747     if (INT64_MAX - microseconds < t)
 748         return AVERROR(ERANGE);
 749     t += microseconds;
 750     if (t == INT64_MIN && negative)
 751         return AVERROR(ERANGE);
 752     *timeval = negative ? -t : t;
 753     return 0;
 754 }
 755
 756 int av_find_info_tag(char *arg, int arg_size, const char *tag1, const char *info)
 757 {
 758     const char *p;
 759     char tag[128], *q;
 760
 761     p = info;
 762     if (*p == '?')
 763         p++;
 764     for(;;) {
 765         q = tag;
 766         while (*p != '\0' && *p != '=' && *p != '&') {
 767             if ((q - tag) < sizeof(tag) - 1)
 768                 *q++ = *p;
 769             p++;
 770         }
 771         *q = '\0';
 772         q = arg;
 773         if (*p == '=') {
 774             p++;
 775             while (*p != '&' && *p != '\0') {
 776                 if ((q - arg) < arg_size - 1) {
 777                     if (*p == '+')
 778                         *q++ = ' ';
 779                     else
 780                         *q++ = *p;
 781                 }
 782                 p++;
 783             }
 784         }
 785         *q = '\0';
 786         if (!strcmp(tag, tag1))
 787             return 1;
 788         if (*p != '&')
 789             break;
 790         p++;
 791     }
 792     return 0;
 793 }