matrixMixerTest.cpp

#define NUMBER_OF_FILE_PLAYERS 8
#define NUMBER_OF_CHANNELS 8

//--------------------------------------------------------------
void ofApp::setup()
{
    
    // Example of how to set matrix mixer levels
    
    Float32 levels[NUMBER_OF_FILE_PLAYERS * 2 + 1][NUMBER_OF_CHANNELS + 1] = {1.0};
    levels[0][NUMBER_OF_CHANNELS] = 0.8;
    levels[1][NUMBER_OF_CHANNELS] = 0.8;
    
    levels[2][NUMBER_OF_CHANNELS] = 0.8;
    levels[3][NUMBER_OF_CHANNELS] = 0.8;
    
    levels[4][NUMBER_OF_CHANNELS] = 0.8;
    levels[5][NUMBER_OF_CHANNELS] = 0.8;
    
    levels[6][NUMBER_OF_CHANNELS] = 0.8;
    levels[7][NUMBER_OF_CHANNELS] = 0.8;
    
//    levels[0][NUMBER_OF_CHANNELS] =  0.5; // set the input volume of file player 0 to 0.777
//    
//    levels[0][5] = 0.999; // set the level of file player 0 in channel 5 to 0.999
//    levels[NUMBER_OF_FILE_PLAYERS * 2][5] =  0.5; // set the output volume of channel 5 to 0.888
//    
//    levels[0][3] = 0.666; // set the level of file player 0 in channel 3 to 0.666
//    levels[NUMBER_OF_FILE_PLAYERS * 2][3] =  0.5; // set the output volume of channel 3 to 0.555
//    
    levels[NUMBER_OF_FILE_PLAYERS * 2][NUMBER_OF_CHANNELS] = 1.0; // setting the global volume to 1
    
    // Note: I've been trying to get the file player to produce mono audio, to no avail.
    // It seems to refuse any attempt to set the channel count to 1. So, we'll need to keep the "* 2"
    // going on in the levels array. So, setting file player 3's level on channel 8 would be:
    
//    levels[3 * 2][8] = 0.5;
    
    
    mixer.connectTo(output);
    
    // Setting the output unit and the matrix mixer to use the same stream format (in this case, 16 channel audio)
    
    output.setDevice("M-Track Eight"); // <- should set the device before the stream format
    
    AudioStreamBasicDescription ASBD = {
        .mSampleRate       = 44100,
        .mFormatID         = kAudioFormatLinearPCM,
        .mFormatFlags      = kAudioFormatFlagsAudioUnitCanonical,
        
        .mChannelsPerFrame = 8, // <- change this to 24 in your case
        .mFramesPerPacket  = 1,
        
        .mBitsPerChannel   = sizeof(AudioUnitSampleType) * 8,
        .mBytesPerPacket   = sizeof(AudioUnitSampleType),
        .mBytesPerFrame    = sizeof(AudioUnitSampleType)
    };

    // setting mixer to have 960 input busses, 1 output bus and use the
    // 16 channel stream format on its output bus
    mmixer.setChannelLayout(NUMBER_OF_FILE_PLAYERS, 1, NULL, &ASBD);
    
    
    //for(size_t i = 0; i < filePlayers.size(); ++i) {
    for(size_t i = 0; i < 8; ++i) {
        filePlayers[i].setFile(ofToDataPath("entertainer.mp3"));
        filePlayers[i].loop();
        filePlayers[i].connectTo(mixer, i); // connect file player 0 to mixer input bus 0, etc
//        filePlayers[i].play();
    }
    
    // this is 2 values for each filePlayer
    levels[0][NUMBER_OF_CHANNELS] = 0.8;
    levels[1][NUMBER_OF_CHANNELS] = 0.8;
    
    levels[2][NUMBER_OF_CHANNELS] = 0.8;
    levels[3][NUMBER_OF_CHANNELS] = 0.8;
    
    levels[4][NUMBER_OF_CHANNELS] = 0.8;
    levels[5][NUMBER_OF_CHANNELS] = 0.8;
    
    levels[6][NUMBER_OF_CHANNELS] = 0.8;
    levels[7][NUMBER_OF_CHANNELS] = 0.8;
    
    levels[8][NUMBER_OF_CHANNELS] = 0.8;
    levels[9][NUMBER_OF_CHANNELS] = 0.8;
    
    output.start();
    
	ofSetVerticalSync(true);
}