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// bethree.cpp STK tutorial program
#include "BeeThree.h"
#include "RtAudio.h"
using namespace stk;
// The TickData structure holds all the class instances and data that
// are shared by the various processing functions.
struct TickData {
Instrmnt *instrument;
StkFloat frequency;
StkFloat scaler;
long counter;
bool done;
// Default constructor.
TickData()
: instrument(0), scaler(1.0), counter(0), done( false ) {}
};
// This tick() function handles sample computation only. It will be
// called automatically when the system needs a new buffer of audio
// samples.
int tick( void *outputBuffer, void *inputBuffer, unsigned int nBufferFrames,
double streamTime, RtAudioStreamStatus status, void *userData )
{
TickData *data = (TickData *) userData;
StkFloat *samples = (StkFloat *) outputBuffer;
for ( unsigned int i=0; i<nBufferFrames; i++ ) {
*samples++ = data->instrument->tick();
if ( ++data->counter % 2000 == 0 ) {
data->scaler += 0.025;
data->instrument->setFrequency( data->frequency * data->scaler );
}
}
if ( data->counter > 80000 )
data->done = true;
return 0;
}
int main()
{
// Set the global sample rate and rawwave path before creating class instances.
Stk::setSampleRate( 44100.0 );
Stk::setRawwavePath( "../../rawwaves/" );
TickData data;
RtAudio dac;
// Figure out how many bytes in an StkFloat and setup the RtAudio stream.
RtAudio::StreamParameters parameters;
parameters.deviceId = dac.getDefaultOutputDevice();
parameters.nChannels = 1;
RtAudioFormat format = ( sizeof(StkFloat) == 8 ) ? RTAUDIO_FLOAT64 : RTAUDIO_FLOAT32;
unsigned int bufferFrames = RT_BUFFER_SIZE;
if ( dac.openStream( ¶meters, NULL, format, (unsigned int)Stk::sampleRate(), &bufferFrames, &tick, (void *)&data ) ) {
std::cout << dac.getErrorText() << std::endl;
goto cleanup;
}
try {
// Define and load the BeeThree instrument
data.instrument = new BeeThree();
}
catch ( StkError & ) {
goto cleanup;
}
data.frequency = 220.0;
data.instrument->noteOn( data.frequency, 0.5 );
if ( dac.startStream() ) {
std::cout << dac.getErrorText() << std::endl;
goto cleanup;
}
// Block waiting until callback signals done.
while ( !data.done )
Stk::sleep( 100 );
// Shut down the callback and output stream.
dac.closeStream();
cleanup:
delete data.instrument;
return 0;
}
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