int audioCallback( void *outputBuffer, void *inputBuffer, unsigned int nBufferFrames,
double streamTime, RtAudioStreamStatus status, void *userData )
{
LightFluidSynth *synth = (LightFluidSynth *)userData;
switch (AUDIO_FORMAT) {
case RTAUDIO_FLOAT32:
{
float *buf = (float *)outputBuffer;
synth->writeStereoFloat(buf, nBufferFrames);
}
break;
case RTAUDIO_SINT16:
{
int16_t *buf = (int16_t *)outputBuffer;
synth->writeStereoS16((short *)buf, nBufferFrames);
}
break;
case RTAUDIO_SINT32:
{
int32_t *buf = (int32_t *)outputBuffer;
synth->writeStereoS32((int *)buf, nBufferFrames);
}
break;
}
return 0;
}
int main(int argc, char** argv)
{
if (argc != 2) {
printf("Usage: synth file.sf2\n");
exit(0);
}
LightFluidSynth *usynth;
usynth = new LightFluidSynth();
usynth->loadSF2(argv[1]);
// usynth->loadSF2("tim.sf2");
RtMidiIn *midiIn = new RtMidiIn();
if (midiIn->getPortCount() == 0) {
std::cout << "No MIDI ports available!\n";
}
midiIn->openPort(0);
midiIn->setCallback( &midiCallback, (void *)usynth );
midiIn->ignoreTypes( false, false, false );
// RtAudio dac(RtAudio::LINUX_PULSE);
RtAudio dac;
RtAudio::StreamParameters rtParams;
// Determine the number of devices available
unsigned int devices = dac.getDeviceCount();
// Scan through devices for various capabilities
RtAudio::DeviceInfo info;
for ( unsigned int i = 0; i < devices; i++ ) {
info = dac.getDeviceInfo( i );
if ( info.probed == true ) {
std::cout << "device " << " = " << info.name;
std::cout << ": maximum output channels = " << info.outputChannels << "\n";
}
}
// rtParams.deviceId = 3;
rtParams.deviceId = dac.getDefaultOutputDevice();
rtParams.nChannels = 2;
unsigned int bufferFrames = FRAME_SIZE;
RtAudio::StreamOptions options;
options.flags = RTAUDIO_SCHEDULE_REALTIME;
dac.openStream( &rtParams, NULL, AUDIO_FORMAT, SAMPLE_RATE, &bufferFrames, &audioCallback, (void *)usynth, &options );
dac.startStream();
printf("\n\nPress Enter to stop\n\n");
cin.get();
dac.stopStream();
delete(usynth);
return 0;
}
int audioCallback( void *outputBuffer, void *inputBuffer, unsigned int nBufferFrames,
double streamTime, RtAudioStreamStatus status, void *userData )
{
LightFluidSynth *synth = (LightFluidSynth *)userData;
#if AUDIO_FORMAT==RTAUDIO_FLOAT32
float *buf = (float *)outputBuffer;
synth->writeStereoFloat(buf, nBufferFrames);
#elif AUDIO_FORMAT==RTAUDIO_SINT16
short *buf = (short *)outputBuffer;
synth->writeStereoS16((short *)buf, nBufferFrames);
#elif AUDIO_FORMAT==RTAUDIO_SINT32
int *buf = (int *)outputBuffer;
synth->writeStereoS32((int *)buf, nBufferFrames);
#endif
return 0;
}
void midiCallback(double deltatime, vector<uint8_t>* msg, void* userData)
{
LightFluidSynth *synth = (LightFluidSynth *)userData;
int chan = (*msg)[0] & 0xf;
int msgtype = (*msg)[0] & 0xf0;
int b1 = (*msg)[1];
int b2 = (*msg)[2];
int b = ((b2 & 0x7f) << 7) | (b1 & 0x7f);
// printf("%f ", deltatime);
switch (msgtype) {
case 0x80:
// std::cout << "MIDI Note OFF C: " << chan << " N: " << b1 << std::endl;
synth->noteOff(chan, b1);
break;
case 0x90:
// std::cout << "MIDI Note ON C: " << chan << " N: " << b1 << " V: " << b2 << std::endl;
synth->noteOn(chan, b1, b2);
break;
case 0xB0:
// std::cout << "MIDI Control change C: " << chan << " B1: " << b1 << " B2: " << b2 << std::endl;
synth->controlChange(chan, b1, b2);
break;
case 0xC0:
// std::cout << "MIDI Program change C: " << chan << " P: " << b1 << std::endl;
synth->programChange(chan, b1);
break;
case 0xD0:
// std::cout << "MIDI Channel presure C: " << chan << " P: " << b1 << std::endl;
synth->channelPresure(chan, b1);
break;
case 0xE0:
// std::cout << "MIDI Pitch Bend C: " << chan << " P: " << b << std::endl;
synth->pitchBend(chan, b);
break;
default:
std::cout << "MIDI msg C: " << chan << " B1: " << b1 << " B2: " << b2 << std::endl;
break;
}
}
