Print an AudioStreamBasicDescription for a given AUGraph node

PrintASBD.m

-(void) printASBDforNode:(AUNode) node scope:(int) scope bus:(int) bus {
    AudioStreamBasicDescription testASBD;
    UInt32 asbdSize = sizeof (AudioStreamBasicDescription);
    AudioUnit nodeUnit;

    AUGraphNodeInfo(_graph, node, NULL, &nodeUnit);
    AudioUnitGetProperty(nodeUnit,
                         kAudioUnitProperty_StreamFormat,
                         scope,
                         bus, // bus
                         &testASBD,
                         &asbdSize);
    NSLog (@"Node: %ld bus %d scope %d. rate: %f, %ld channels, %ld bits per channel", node, bus, scope, testASBD.mSampleRate, testASBD.mChannelsPerFrame, testASBD.mBitsPerChannel);
}