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#include <stdio.h>
#include <string.h>
static struct tv_channels {
const char *channel;
double video_mhz;
double audio_mhz;
} tv_channels[] = {
{ "1", 41.25, 46.75 },
{ "2", 48.25, 53.75 },
{ "3", 55.25, 60.75 },
{ "4", 62.25, 67.75 },
{ "S1", 105.25, 110.75 },
{ "S2", 112.25, 117.75 },
{ "S3", 118.25, 123.75 },
{ "S4", 126.25, 131.75 },
{ "S5", 133.25, 138.75 },
{ "S6", 140.25, 148.75 },
{ "S7", 147.25, 152.75 },
{ "S8", 154.25, 159.75 },
{ "S9", 161.25, 166.75 },
{ "S10", 168.25, 173.75 },
{ "5", 175.25, 180.75 },
{ "6", 182.25, 187.75 },
{ "7", 189.25, 194.75 },
{ "8", 196.25, 201.75 },
{ "9", 203.25, 208.75 },
{ "10", 210.25, 215.75 },
{ "11", 217.25, 222.75 },
{ "12", 224.25, 229.75 },
{ "S11", 231.25, 236.75 },
{ "S12", 238.25, 243.75 },
{ "S13", 245.25, 250.75 },
{ "S14", 252.25, 257.75 },
{ "S15", 259.25, 264.75 },
{ "S16", 266.25, 271.75 },
{ "S17", 273.25, 278.75 },
{ "S18", 280.25, 285.75 },
{ "S19", 287.25, 292.75 },
{ "S20", 294.25, 299.75 },
{ "S21", 303.25, 308.75 },
{ "S22", 311.25, 316.75 },
{ "S23", 319.25, 324.75 },
{ "S24", 327.25, 332.75 },
{ "S25", 335.25, 340.75 },
{ "S26", 343.25, 348.75 },
{ "S27", 351.25, 356.75 },
{ "S28", 359.25, 364.75 },
{ "S29", 367.25, 372.75 },
{ "S30", 375.25, 380.75 },
{ "S31", 383.25, 388.75 },
{ "S32", 391.25, 396.75 },
{ "S33", 399.25, 404.75 },
{ "S34", 407.25, 412.75 },
{ "S35", 415.25, 420.75 },
{ "S36", 423.25, 428.75 },
{ "S37", 431.25, 436.75 },
{ "S38", 439.25, 444.75 },
{ "S39", 447.25, 452.75 },
{ "S40", 455.25, 460.75 },
{ "S41", 463.25, 468.75 },
{ "21", 471.25, 476.75 },
{ "22", 479.25, 484.75 },
{ "23", 487.25, 492.75 },
{ "24", 495.25, 500.75 },
{ "25", 503.25, 508.75 },
{ "26", 511.25, 516.75 },
{ "27", 519.25, 524.75 },
{ "28", 527.25, 532.75 },
{ "29", 535.25, 540.75 },
{ "30", 543.25, 548.75 },
{ "31", 551.25, 556.75 },
{ "32", 559.25, 564.75 },
{ "33", 567.25, 572.75 },
{ "34", 575.25, 580.75 },
{ "35", 583.25, 588.75 },
{ "36", 591.25, 596.75 },
{ "37", 599.25, 604.75 },
{ "38", 607.25, 612.75 },
{ "39", 615.25, 620.75 },
{ "40", 623.25, 628.75 },
{ "41", 631.25, 636.75 },
{ "42", 639.25, 644.75 },
{ "43", 647.25, 652.75 },
{ "44", 655.25, 660.75 },
{ "45", 663.25, 668.75 },
{ "46", 671.25, 676.75 },
{ "47", 679.25, 684.75 },
{ "48", 687.25, 692.75 },
{ "49", 695.25, 700.75 },
{ "50", 703.25, 708.75 },
{ "51", 711.25, 716.75 },
{ "52", 719.25, 724.75 },
{ "53", 727.25, 732.75 },
{ "54", 735.25, 740.75 },
{ "55", 743.25, 748.75 },
{ "56", 751.25, 756.75 },
{ "57", 759.25, 764.75 },
{ "58", 767.25, 772.75 },
{ "59", 775.25, 780.75 },
{ "60", 783.25, 788.75 },
{ "61", 791.25, 796.75 },
{ "62", 799.25, 804.75 },
{ "63", 807.25, 812.75 },
{ "64", 815.25, 820.75 },
{ "65", 823.25, 828.75 },
{ "66", 831.25, 836.75 },
{ "67", 839.25, 844.75 },
{ "68", 847.25, 852.75 },
{ "69", 855.25, 860.75 },
{ 0, 0, 0, }
};
double get_tv_frequency(const char *channel, double *audio_offset)
{
int i;
for (i = 0; tv_channels[i].channel; i++) {
if (!strcasecmp(tv_channels[i].channel, channel)) {
*audio_offset = (tv_channels[i].audio_mhz - tv_channels[i].video_mhz) * 1e6;
return tv_channels[i].video_mhz * 1e6;
}
}
return 0.0;
}
void list_tv_channels(void)
{
int i;
printf("List of TV channels in MHz:\n\n");
printf("Channel Video Audio\n");
printf("------------------------\n");
for (i = 0; tv_channels[i].channel; i++) {
printf("%s\t%.2f\t%.2f\n", tv_channels[i].channel, tv_channels[i].video_mhz, tv_channels[i].audio_mhz);
}
}
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