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separate frequency from accumulator

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Emile Clark-Boman 2025-09-04 11:23:07 +10:00
parent df5b2e9b5c
commit 2711027dcf
1 changed files with 8 additions and 5 deletions
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13
lib/main.c
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@ -11,6 +11,8 @@
#define DEFAULT_VOLUME 0.7
#define DEFAULT_FREQ 200
#define DEFAULT_ACCUMULATOR -1
#define PWSTREAM_NAME "Dorne"
struct data {
@ -43,9 +45,9 @@ 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 * DEFAULT_FREQ / DEFAULT_RATE; // * 440
if (data->accumulator >= M_PI_M2) {
data->accumulator -= M_PI_M2;
// data->accumulator += M_PI_M2 * DEFAULT_FREQ / DEFAULT_RATE; // * 440
if (data->accumulator++ == DEFAULT_RATE) {
data->accumulator = DEFAULT_ACCUMULATOR;
data->cycle++;
}
@ -55,7 +57,7 @@ static void on_process(void *userdata) {
* Another common method to convert a double to
* 16 bits is to multiple by 32768.0 and then clamp to
* [-32768 32767] to get the full 16 bits range. */
val = sin(data->accumulator) * DEFAULT_VOLUME * 32767.0;
val = sin(data->accumulator * M_PI_M2 * DEFAULT_FREQ / DEFAULT_RATE) * DEFAULT_VOLUME * 32767.0;
for (c = 0; c < DEFAULT_CHANNELS; c++)
*dst++ = val;
}
@ -75,7 +77,8 @@ static const struct pw_stream_events stream_events = {
int main(int argc, char *argv[]) {
struct data data = {
0,
.accumulator = DEFAULT_ACCUMULATOR,
.cycle = 0,
};
const struct spa_pod *params[1];
uint8_t buffer[1024];