Question

Has anybody successfully implemented an Instrument using MoMu STK on iOS? I am bit stacked with initialization of a stream for Instrument.
I am using tutorial code and looks like something missing

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;

        dac.openStream( & parameters, NULL, format, (unsigned int)Stk::sampleRate(), &bufferFrames, &tick, (void *)&data );

Error description says that output parameters for output device are invalid, but when I skip to assign device id then it’s not working as well.
Any idea would be great.

Answer 1

RtAudio is only for desktop apps and there is no need to open stream when implementing on iOS.

example:

Header file:

#import "Simple.h"

// make struct to hold 

struct TickData {

    Simple *synth;    

};

// Make instance of the struct in @interface= 
TickData data;

Implementation file:

// init the synth:
data.synth = new Simple();
data.synth->keyOff();

// to trigger note on/off:
data.synth->noteOn(frequency, velocity);
data.synth->noteOff(velocity);

// audio callback method:
for (int i=0; i < FRAMESIZE; i++) {
    buffer[i] = data.synth -> tick();
}