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add clipper

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This commit is contained in:
KubaPro010
2024-12-30 13:05:48 +01:00
parent c42e0fba94
commit b93cc94143
3 changed files with 16 additions and 215 deletions
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18
stereo_coder.c
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@@ -8,6 +8,7 @@
#define INPUT_DEVICE "real_real_tx_audio_input.monitor"
#define OUTPUT_DEVICE "alsa_output.platform-soc_sound.stereo-fallback"
#define BUFFER_SIZE 512
#define CLIPPER_THRESHOLD 0.7
#define MONO_VOLUME 0.5f // L+R Signal
#define PILOT_VOLUME 0.025f // 19 KHz Pilot
@@ -15,6 +16,16 @@
volatile sig_atomic_t to_run = 1;
float clip(float sample) {
if (sample > CLIPPER_THRESHOLD) {
return CLIPPER_THRESHOLD; // Clip to the upper threshold
} else if (sample < -CLIPPER_THRESHOLD) {
return -CLIPPER_THRESHOLD; // Clip to the lower threshold
} else {
return sample; // No clipping
}
}
const float format_scale = 1.0f / 32768.0f;
void stereo_s16le_to_float(const int16_t *input, float *left, float *right, size_t num_samples) {
for (size_t i = 0; i < num_samples/2; i++) {
@@ -144,8 +155,11 @@ int main() {
float pilot = get_next_sample(&pilot_osc);
float stereo_carrier = get_next_sample(&stereo_osc);
float mono = (left[i] + right[i]) / 2.0f;
float stereo = (left[i] - right[i]) / 2.0f;
float current_left = clip(left[i]);
float current_right = clip(right[i]);
float mono = (current_left + current_right) / 2.0f;
float stereo = (current_left - current_right) / 2.0f;
mpx[i] = mono*MONO_VOLUME +
(stereo * stereo_carrier)*STEREO_VOLUME +