Apple

On Fri, Mar 8, 2013 at 11:39 PM, Paul Davis <email@hidden> wrote:

On Fri, Mar 8, 2013 at 10:56 PM, Rob Nikander <email@hidden> wrote:

[...]

a suitable type of AudioUnit has a functioning MIDIEvent() method that can be called just before you call Render, to deliver MIDI Data to the plugin. there are other MIDI-related methods to deliver non-channel MIDI messages.

Ah, thanks. I see the functions like `MusicDeviceMIDIEvent` in MusicDevice.h. I wrote a sample program to try to do this, but I'm doing something wrong. Strangely, if I uncomment the cout output line, it works -- the output AIFF file contains piano notes. But when it's commented out, the file is silent. Is this some kind of threading issue I don't know about? The abbreviated/pseudo code is:

open an ExtAudioFile to write an AIFF file

setup Generic Output and DLSSynth units, synth set to offline render

time = 0.0

while (time < 5.0) {

send 'note on' to synth on half seconds

send 'note off' to synth on full seconds
AudioUnitRender(out, &flags, &timeStamp, numFrames, buffers)
// cout << "weird" << endl;
ExtAudioFileWrite(f, numFrames, buffers) );
time += numFrames * (1.0 / sampleRate);
timeStamp.mSampleTime += numFrames;
}

thanks,

Rob

References:
	>Understanding offline MIDI MusicDevice render (From: Rob Nikander <email@hidden>)
	>Re: Understanding offline MIDI MusicDevice render (From: Paul Davis <email@hidden>)