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add alsa output to pstcode, scamod

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This commit is contained in:
kuba
2025-01-25 19:58:14 +01:00
parent efd83adf39
commit 634ba05d61
7 changed files with 89 additions and 448 deletions
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src/polar_stereo_coder.c
+39
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@@ -17,6 +17,7 @@
#define INPUT_DEVICE "real_real_tx_audio_input.monitor"
#define OUTPUT_DEVICE "alsa_output.platform-soc_sound.stereo-fallback"
// #define ALSA_OUTPUT // Output, not input or both
#define BUFFER_SIZE 512
#define CLIPPER_THRESHOLD 0.525 // Adjust this as needed
@@ -75,11 +76,13 @@ int main() {
.maxlength = buffer_maxlength,
.fragsize = buffer_tlength_fragsize
};
#ifndef ALSA_OUTPUT
pa_buffer_attr output_buffer_atr = {
.maxlength = buffer_maxlength,
.tlength = buffer_tlength_fragsize,
.prebuf = buffer_prebuf
};
#endif
printf("Connecting to input device... (%s)\n", INPUT_DEVICE);
@@ -101,6 +104,7 @@ int main() {
printf("Connecting to output device... (%s)\n", OUTPUT_DEVICE);
#ifndef ALSA_OUTPUT
pa_simple *output_device = pa_simple_new(
NULL,
"PolarStereoEncoder",
@@ -117,6 +121,33 @@ int main() {
pa_simple_free(input_device);
return 1;
}
#else
snd_pcm_hw_params_t *output_params;
snd_pcm_t *output_handle;
int output_error = snd_pcm_open(&output_handle, OUTPUT_DEVICE, SND_PCM_STREAM_PLAYBACK, 0);
if(output_error < 0) {
fprintf(stderr, "Error: cannot open output device: %s\n", snd_strerror(output_error));
pa_simple_free(input_device);
return 1;
}
snd_pcm_hw_params_malloc(&output_params);
snd_pcm_hw_params_any(output_handle, output_params);
snd_pcm_hw_params_set_access(output_handle, output_params, SND_PCM_ACCESS_RW_INTERLEAVED);
snd_pcm_hw_params_set_format(output_handle, output_params, SND_PCM_FORMAT_FLOAT); // Same as pulse's Float32NE
snd_pcm_hw_params_set_channels(output_handle, output_params, 1);
unsigned int rate = SAMPLE_RATE;
int dir;
snd_pcm_hw_params_set_rate_near(output_handle, output_params, &rate, &dir);
snd_pcm_uframes_t frames = BUFFER_SIZE;
snd_pcm_hw_params_set_period_size_near(output_handle, output_params, &frames, &dir); // i don't have a clue why like this
output_error = snd_pcm_hw_params(output_handle, output_params);
if(output_error < 0) {
fprintf(stderr, "Error: cannot open output device: %s\n", snd_strerror(output_error));
snd_pcm_close(output_handle);
pa_simple_free(input_device);
return 1;
}
#endif
Oscillator stereo_osc;
init_oscillator(&stereo_osc, 31250.0, SAMPLE_RATE);
@@ -186,14 +217,22 @@ int main() {
((stereo+0.2) * stereo_carrier)*STEREO_VOLUME; // the 0.2 add DC, you know what happens then? Carrier wave
}
#ifndef ALSA_OUTPUT
if (pa_simple_write(output_device, mpx, sizeof(mpx), &pulse_error) < 0) {
fprintf(stderr, "Error writing to output device: %s\n", pa_strerror(pulse_error));
to_run = 0;
break;
}
#else
snd_pcm_writei(output_handle, mpx, sizeof(mpx));
#endif
}
printf("Cleaning up...\n");
pa_simple_free(input_device);
#ifndef ALSA_OUTPUT
pa_simple_free(output_device);
#else
snd_pcm_drain(output_handle);
snd_pcm_free(output_handle);
return 0;
}