private FMOD.RESULT DSPCallback(ref FMOD.DSP_STATE dsp_state, IntPtr inbuffer, IntPtr outbuffer, uint length, int inchannels, ref int outchannels)
{
float[] buffer = new float[length * inchannels];
int i = 0;
IntPtr currentPtr;
this.inchannels = inchannels;
for (i = 0; i < length * inchannels; i++)
{
currentPtr = new IntPtr(inbuffer.ToInt32() + (i * sizeof(float)));
float sample = (float)System.Runtime.InteropServices.Marshal.PtrToStructure(currentPtr, typeof(float));
buffer[i] = LowPassFilter(sample, i % inchannels);
sampleNumber++;
if (sampleNumber >= sampleRate)
{
sampleNumber = 0;
}
}
Marshal.Copy(buffer, 0, outbuffer, (int)length * inchannels);
return(FMOD.RESULT.OK);
}
unsafe public static FMOD.RESULT ReadAudioData(ref FMOD.DSP_STATE dspState, IntPtr inbuffer, IntPtr outbuffer, uint length, int inchannels, ref int outchannels)
{
FMOD.DSP dspInstance = new FMOD.DSP(dspState.instance);
float *inb = (float *)inbuffer.ToPointer();
float *outb = (float *)outbuffer.ToPointer();
IntPtr userData;
// NOTE: Without this check, Unity crashes!
if (dspInstance.getUserData(out userData) == FMOD.RESULT.OK)
{
float *userBuffer = (float *)userData.ToPointer();
// TODO: See if there is a better way to do this.
// Just copy back.
for (uint samp = 0; samp < length; samp++)
{
/*
* Feel free to unroll this.
*/
// TODO: There are at least 2 channels, what do we do?
// Do we save the maximum, the average?
userBuffer[samp] = inb[(samp * inchannels)];
for (int chan = 0; chan < outchannels; chan++)
{
long outIdx = (samp * outchannels) + chan;
long inIdx = (samp * inchannels) + chan;
float value = inb[inIdx];
outb[outIdx] = value;
}
}
}
return(FMOD.RESULT.OK);
}
private RESULT ReadCallback(ref DSP_STATE dspState, IntPtr inbuffer, IntPtr outbuffer, uint length, int inchannels, ref int outchannels)
{
st.Stop();
var ticksPerMilisecond = Stopwatch.Frequency / 1000;
var miliseconds = (double)st.ElapsedTicks / ticksPerMilisecond;
//System.Diagnostics.Debug.WriteLine("miliseconds between callbacks: " + miliseconds);
st.Restart();
float[] spectrum;
if (this.ReadSpectrum(out spectrum))
{
var noiseLevel = this.ComputeNoiseLevel(spectrum);
var spectrumWithRemovedNoise = this.DecreaseSpectrumVolume(spectrum, noiseLevel);
//spectrumWithRemovedNoise = spectrum;
var dominant = this.ComputeDominant(spectrumWithRemovedNoise);
//System.Diagnostics.Debug.WriteLine("dominant: " + dominant);
var trimmedSpectrum = this.TrimSpectrumToInstrument(spectrumWithRemovedNoise);
//trimmedSpectrum = spectrumWithRemovedNoise;
this.NotifySoundSpectrumChangedListeners(trimmedSpectrum);
this.NotifyListeners(dominant);
}
st.Stop();
ticksPerMilisecond = Stopwatch.Frequency/1000;
miliseconds = (double) st.ElapsedTicks/ticksPerMilisecond;
//System.Diagnostics.Debug.WriteLine("miliseconds of processing callback: " + miliseconds);
st.Restart();
return RESULT.OK;
}