static int renderCallback(IntPtr inRefCon,
ref AudioUnit.AudioUnitRenderActionFlags _ioActionFlags,
ref AudioTimeStamp _inTimeStamp,
uint _inBusNumber,
uint _inNumberFrames,
AudioBufferList _ioData)
{
// getting audiounit instance
var handler = GCHandle.FromIntPtr(inRefCon);
var inst = (AUGraph)handler.Target;
// evoke event handler with an argument
if (inst.RenderCallback != null)
{
var args = new AudioGraphEventArgs(
_ioActionFlags,
_inTimeStamp,
_inBusNumber,
_inNumberFrames,
_ioData);
inst.RenderCallback(inst, args);
}
return(0); // noerror
}
public AudioGraphEventArgs(AudioUnit.AudioUnitRenderActionFlags _ioActionFlags,
MonoTouch.AudioToolbox.AudioTimeStamp _inTimeStamp,
uint _inBusNumber,
uint _inNumberFrames,
AudioBufferList _ioData)
: base(_ioActionFlags, _inTimeStamp, _inBusNumber, _inNumberFrames, _ioData)
{
}
public AudioUnitEventArgs(AudioUnit.AudioUnitRenderActionFlags _ioActionFlags,
MonoTouch.AudioToolbox.AudioTimeStamp _inTimeStamp,
uint _inBusNumber,
uint _inNumberFrames,
AudioBufferList _ioData)
{
ActionFlags = _ioActionFlags;
this.TimeStamp = _inTimeStamp;
BusNumber = _inBusNumber;
NumberFrames = _inNumberFrames;
Data = _ioData;
}
public AudioUnitEventArgs(AudioUnit.AudioUnitRenderActionFlags _ioActionFlags,
MonoTouch.AudioToolbox.AudioTimeStamp _inTimeStamp,
uint _inBusNumber,
uint _inNumberFrames,
AudioBufferList _ioData)
{
ActionFlags = _ioActionFlags;
this.TimeStamp = _inTimeStamp;
BusNumber = _inBusNumber;
NumberFrames = _inNumberFrames;
Data = _ioData;
}
static int device_renderCallback(IntPtr inRefCon,
ref AudioUnit.AudioUnitRenderActionFlags _ioActionFlags,
ref AudioTimeStamp _inTimeStamp,
uint _inBusNumber,
uint _inNumberFrames,
AudioBufferList _ioData)
{
System.Diagnostics.Debug.WriteLine("o");
var handler = GCHandle.FromIntPtr(inRefCon);
var inst = (RemoteOutput)handler.Target;
var waveDef = inst._waveDef[_inBusNumber];
double dphai = 2 * Math.PI * waveDef.frequency / waveDef.sampleRate;
double phase = waveDef.phase;
// Getting a pointer to a buffer to be filled
IntPtr outL = _ioData.mBuffers[0].mData;
IntPtr outR = _ioData.mBuffers[1].mData;
// filling sin waveform.
// AudioUnitSampleType is different between a simulator (float32) and a real device (int32).
unsafe
{
var outLPtr = (int *)outL.ToPointer();
var outRPtr = (int *)outR.ToPointer();
for (int i = 0; i < _inNumberFrames; i++)
{
int sample = (int)(Math.Sin(phase) * int.MaxValue / 128); // signal waveform format is fixed-point (8.24)
* outLPtr++ = sample;
* outRPtr++ = sample;
phase += dphai;
}
}
waveDef.phase = phase % (2 * Math.PI);
return(0);
}
