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#include <stdio.h>
#include <portaudio.h>
#include "mossrose.h"
PaStream *stream;
struct audio_output_t {
float l;
float r;
};
static int callback(
const void *input,
void *output,
unsigned long frame_count,
const PaStreamCallbackTimeInfo *time_info,
void *userdata)
{
static float left = 0;
static float right = 0;
struct audio_output_t *out = output;
for (int i=0; i<frame_count; i++) {
out[i].l = left;
out[i].r = right;
left += 0.01;
right += 0.03;
if (left > 1) left -= 2;
if (right > 1) right -= 2;
}
return 0;
}
int mr_init(double sample_rate, int n_channels)
{
PaError err;
err = Pa_Initialize();
if (err != paNoError) {
fprintf(stderr, "failed to initialize PortAudio!\n");
return 1;
}
err = Pa_OpenDefaultStream(&stream, 0, 2, paFloat32, sample_rate, 0, callback, NULL);
if (err != paNoError) {
fprintf(stderr, "failed to open audio stream!\n");
return 1;
}
err = Pa_StartStream(stream);
if (err != paNoError) {
fprintf(stderr, "failed to start audio stream!\n");
return 1;
}
return 0;
};
int mr_terminate(double sample_rate, int n_channels)
{
Pa_AbortStream(stream);
Pa_CloseStream(stream);
Pa_Terminate();
return 0;
}
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