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make frequency variable

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Emile Clark-Boman 2025-09-04 11:11:39 +10:00
parent b86ad339d9
commit df5b2e9b5c
1 changed files with 9 additions and 3 deletions
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12
lib/main.c
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@ -9,6 +9,7 @@
#define DEFAULT_RATE 44100
#define DEFAULT_CHANNELS 2
#define DEFAULT_VOLUME 0.7
#define DEFAULT_FREQ 200
#define PWSTREAM_NAME "Dorne"
@ -16,6 +17,7 @@ struct data {
struct pw_main_loop *loop;
struct pw_stream *stream;
double accumulator;
uint32_t cycle;
};
/* [on_process] */
@ -41,9 +43,11 @@ static void on_process(void *userdata) {
n_frames = SPA_MIN(b->requested, n_frames);
for (i = 0; i < n_frames; i++) {
data->accumulator += M_PI_M2 * 440 / DEFAULT_RATE;
if (data->accumulator >= M_PI_M2)
data->accumulator += M_PI_M2 * DEFAULT_FREQ / DEFAULT_RATE; // * 440
if (data->accumulator >= M_PI_M2) {
data->accumulator -= M_PI_M2;
data->cycle++;
}
/* sin() gives a value between -1.0 and 1.0, we first apply
* the volume and then scale with 32767.0 to get a 16 bits value
@ -98,11 +102,13 @@ int main(int argc, char *argv[]) {
PW_STREAM_FLAG_RT_PROCESS,
params, 1);
// TODO: use pw_thread_loop instead of pw_main_loop
pw_main_loop_run(data.loop);
printf("exitting\n");
pw_stream_destroy(data.stream);
pw_main_loop_destroy(data.loop);
return 0;
return EXIT_SUCCESS;
}
/* [code] */