unsafe AudioUnitStatus AudioUnit_RenderCallback(AudioUnitRenderActionFlags actionFlags,
AudioTimeStamp timeStamp, uint busNumber, uint numberFrames, AudioBuffers data)
{
_clock.Restart();
AudioUnitStatus err = AudioUnitStatus.OK;
if (_audioInputIsAvailable && _numInputChannels > 0)
{
err = _audioUnit.Render(ref actionFlags, timeStamp, 1, numberFrames, data);
}
var dataPtr = data[0].Data;
if (_callback != null)
{
if (numberFrames > _sampleBuffer.NumSamples)
{
PrepareFloatBuffers((int)numberFrames);
}
if (_audioInputIsAvailable && _numInputChannels > 0)
{
var shortData = (short *)dataPtr.ToPointer();
if (_numInputChannels >= 2)
{
float *leftInput = _inputChannels[0];
float *rightInput = _inputChannels[1];
for (var i = 0; i < numberFrames; ++i)
{
*leftInput++ = *shortData++ *ShortToFloat;
*rightInput++ = *shortData++ *ShortToFloat;
}
}
else
{
float *leftInput = _inputChannels[0];
for (var i = 0; i < numberFrames; ++i)
{
*leftInput++ = *shortData++ *ShortToFloat;
++shortData;
}
}
}
else
{
for (var i = _numInputChannels; --i >= 0;)
{
_sampleBuffer.ClearChannel(i);
}
}
_callback.AudioDeviceIOCallback(
_inputChannels, _numInputChannels,
_outputChannels, _numOutputChannels,
(int)numberFrames
);
if (_out != null)
{
byte *bytes = (byte *)_outputChannels[0];
for (var i = 0; i < numberFrames * sizeof(float); ++i)
{
_out.WriteByte(*bytes++);
}
}
{
var shortData = (short *)dataPtr.ToPointer();
float *leftOutput = _outputChannels[0];
float *rightOutput = _outputChannels[1];
if (_numOutputChannels >= 2)
{
for (var i = 0; i < numberFrames; ++i)
{
*shortData++ = (short)(*leftOutput++ *FloatToShort);
*shortData++ = (short)(*rightOutput++ *FloatToShort);
}
}
else if (_numOutputChannels == 1)
{
float *output = _outputChannels[0];
for (var i = 0; i < numberFrames; ++i)
{
short sample = (short)(*output++ *FloatToShort);
* shortData++ = sample;
* shortData++ = sample;
}
}
else
{
for (var i = 0; i < numberFrames; ++i)
{
*shortData++ = 0;
*shortData++ = 0;
}
}
}
}
else
{
var shortData = (short *)dataPtr.ToPointer();
for (var i = 0; i < numberFrames; ++i)
{
*shortData++ = 0;
*shortData++ = 0;
}
}
_clock.Stop();
return(err);
}
