void audio_callback(void *_beeper, Uint8 *_stream, int _length)
{
Sint16 *stream = (Sint16*) _stream;
int length = _length / 2;
Beeper* beeper = (Beeper*) _beeper;
beeper->generateSamples(stream, length);
}
void * sound_thread( void *ptr ) {
SDL_Init(SDL_INIT_AUDIO);
Beeper b;
while(true){
float vol = error_volume;
printf("vol = %f\n",vol);
b.beep(200,vol);
usleep(100);
}
}
int main(int argc, char* argv[])
{
int i,j;
// Duration and Frequency of Key Press, for debugging
int duration;
int hz;
Beeper b;
short currNote=-1;
SDL_Init(SDL_INIT_AUDIO);
printf("Starting MIDI Reader.....\n");
Song *song = (Song *) malloc(sizeof(Song));
loadMIDI("res/ABCDEFG.mid", song);
for( i = 0; i < song->length; ++i) {
//for( i = 0; i < 1; ++i) {
Bar bar = song->bars[i];
//printf("Bar %03d:\t", i);
//printf("Key: %d\t TimeSig: %d/%d\t Tempo: %d\n\t", bar.key, bar.tsig_numerator, bar.tsig_denominator, (unsigned) bar.tempo);
for( j = 0; j < bar.length; ++j) {
Note note = bar.notes[j];
// Piano Key to Frequency Conversion: https://en.wikipedia.org/wiki/Piano_key_frequencies
// This If statement is a hack for now just for testing
if (currNote != note.time) {
printf(" {%d,%d,%d}", note.time, note.duration, note.value);
hz = (float) pow(2, (float) (note.value-49)/12)*440;
/*printf("hz: %d \n",hz);
printf("note.value-49: %d \n", (note.value-49));
printf("/12: %f \n", (float) (note.value-49)/12);
printf("pow: %f \n", (float) pow(2, (float) (note.value-49)/12));
printf("*400: %f \n", (float) 400*pow(2, (float) (note.value-49)/12));*/
b.beep(hz, 30*1000/bar.tempo*note.duration);
currNote = note.time;
b.wait();
}
//b.wait();
}
currNote = -1;
printf("\n");
}
//b.wait();
free(song);
return 0;
}
