doc} audio-dsp-src.c title
doc} audio-dsp-src.c doc
#include <stdio.h>
#include <errno.h>
#include <math.h>
#include <signal.h>
#define M_PI_M2 ( M_PI + M_PI )
#define DEFAULT_RATE 44100
#define DEFAULT_FREQ 440
#define DEFAULT_VOLUME 0.7
struct data;
struct port {
struct data *data;
double accumulator;
};
struct data {
struct port *out_port;
};
{
struct data *data = userdata;
float *out;
struct port *out_port = data->out_port;
if (out == NULL)
return;
for (i = 0; i < n_samples; i++) {
out_port->accumulator += M_PI_M2 * DEFAULT_FREQ / DEFAULT_RATE;
if (out_port->accumulator >= M_PI_M2)
out_port->accumulator -= M_PI_M2;
*out++ = sin(out_port->accumulator) * DEFAULT_VOLUME;
}
}
.process = on_process,
};
static void do_quit(void *userdata, int signal_number)
{
struct data *data = userdata;
}
int main(int argc, char *argv[])
{
struct data data = { 0, };
"audio-dsp-src",
NULL),
&filter_events,
&data);
sizeof(struct port),
NULL),
NULL, 0);
NULL, 0) < 0) {
fprintf(stderr, "can't connect\n");
return -1;
}
return 0;
}