forked from cellular-infrastructure/osmocom-analog
TV: Minor code cleanup
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83449726f8
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7c4cfd5567
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@ -69,13 +69,15 @@ static struct tv_channels {
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{ 0, 0, 0, }
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};
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double get_tv_video_frequency(int channel)
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double get_tv_frequency(int channel, double *audio_offset)
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{
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int i;
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for (i = 0; tv_channels[i].channel; i++) {
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if (tv_channels[i].channel == channel)
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if (tv_channels[i].channel == channel) {
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*audio_offset = (tv_channels[i].audio_mhz - tv_channels[i].video_mhz) * 1e6;
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return tv_channels[i].video_mhz * 1e6;
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}
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}
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return 0.0;
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@ -1,4 +1,4 @@
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double get_tv_video_frequency(int channel);
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double get_tv_frequency(int channel, double *audio_offset);
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void list_tv_channels(void);
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@ -53,7 +53,7 @@ int rt_prio = 1;
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void *get_sender_by_empfangsfrequenz() { return NULL; }
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static double __attribute__((__unused__)) modulation = 0.7; /* level of modulation for I/Q amplitudes */
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static double frequency = 0.0;
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static double frequency = 0.0, audio_offset;
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static int fbas = 1;
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static int tone = 1;
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static double circle_radius = 6.7;
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@ -161,7 +161,7 @@ static int handle_options(int short_option, int argi, char **argv)
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list_tv_channels();
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return 0;
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}
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frequency = get_tv_video_frequency(atoi(argv[argi]));
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frequency = get_tv_frequency(atoi(argv[argi]), &audio_offset);
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if (frequency == 0.0) {
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fprintf(stderr, "Given channel number unknown, use \"-c list\" to get a list.\n");
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return -EINVAL;
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@ -275,7 +275,7 @@ static void tx_bas(sample_t *sample_bas, __attribute__((__unused__)) sample_t *s
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if (sample_tone) {
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/* bandwidth is 2*(deviation + 2*f(sig)) = 2 * (50 + 2*15) = 160khz */
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fm_mod_t mod;
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fm_mod_init(&mod, samplerate, 5500000.0, modulation * 0.1);
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fm_mod_init(&mod, samplerate, audio_offset, modulation * 0.1);
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mod.state = MOD_STATE_ON; /* do not ramp up */
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fm_modulate_complex(&mod, sample_tone, power_tone, samples, buff);
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}
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