private void button2_Click(object sender, EventArgs e)
{
bool normalized = false;
Crossover crossover = Crossover.createThreeWayCrossover(Int32.Parse(txtLowerFreq.Text),
Int32.Parse(txtUpperFreq.Text), Int32.Parse(txtLowerTrans.Text), Int32.Parse(txtUpperTrans.Text),
44100, normalized, false, 10.0);
RawFileReader rdr = new RawFileReader(lblFileName.Text, 16, 44100, 2);
ConvertBitsPerSample bps = new ConvertBitsPerSample(rdr, 24);
CrossoverThreeWayFilter filter = new CrossoverThreeWayFilter(bps, crossover);
measureErrorDB(filter, crossover.wooferFilterKernel.Length);
}
/// <summary>
/// An attempt at a quick method to display the distortion introduced by running
/// the input file through the digital crossover. Prints results in the debug
/// console. Ideally we want any numerical errors to be less than 120dB, a
/// level that will be inaudible.
/// </summary>
private void measureErrorDB(CrossoverThreeWayFilter filter, int kernelLength)
{
double[] filterData = new double[1024 * 10 * 6];
double[] fileData = new double[1024 * 10 * 2];
double[] filterSum = new double[1024 * 10 * 2];
Dictionary <Int32, Int32> dict = new Dictionary <Int32, Int32>();
RawFileReader rdr2 = new RawFileReader(lblFileName.Text, 16, 44100, 2);
ConvertBitsPerSample bps2 = new ConvertBitsPerSample(rdr2, 24);
filter.read(filterData, 0, (kernelLength / 2) * 6);
while (true)
{
int nReadFilter = filter.read(filterData, 0, filterData.Length);
if (nReadFilter == 0)
{
break;
}
int nReadFile = bps2.read(fileData, 0, fileData.Length);
if (nReadFile * 3 != nReadFilter)
{
break;
}
//throw new Exception("" + (nReadFile * 3) + "!=" + nReadFilter);
for (int i = 0; i < nReadFilter; i += 6)
{
filterSum[i / 3] = filterData[i] + filterData[i + 2] + filterData[i + 4];
filterSum[i / 3 + 1] = filterData[i + 1] + filterData[i + 3] + filterData[i + 5];
}
for (int i = 0; i < fileData.Length; i++)
{
int error = (int)Math.Round(Math.Log10(Math.Abs(filterSum[i] - fileData[i]) / fileData[i]) * 20.0);
if (dict.ContainsKey(error))
{
dict[error]++;
}
else
{
dict.Add(error, 1);
}
}
}
Console.Out.WriteLine("Max noise: " + dict.Keys.Max() + " dB");
List <Int32> keys = new List <int>(dict.Keys);
keys.Sort();
foreach (int k in keys)
{
Console.Out.WriteLine("" + k + " dB: " + dict[k]);
}
}
private void btnPlay_Click(object sender, EventArgs e)
{
IAudioFilter waveRdr;
// For the purposes of testing we process .raw files as
// containing 16-bit stereo PCM data at 44.1KHz. This is much
// like a .wav file but without the header.
if (lblFileName.Text.EndsWith(".raw"))
{
waveRdr = new RawFileReader(lblFileName.Text, 16, 44100, 2);
}
else
{
IWaveSource inputFile = CodecFactory.Instance.GetCodec(lblFileName.Text);
waveRdr = new WaveSourceReader(inputFile);
}
// Convert to 24 bit samples (if needed)
ConvertBitsPerSample bpsConvert = new ConvertBitsPerSample(waveRdr, 24);
// Create a crossover and catch any errors in case the frequency parameters
// are not valid
Crossover crossover;
try
{
crossover = Crossover.createThreeWayCrossover(Int32.Parse(txtLowerFreq.Text),
Int32.Parse(txtUpperFreq.Text), Int32.Parse(txtLowerTrans.Text), Int32.Parse(txtUpperTrans.Text),
waveRdr.SampleRate, true, false, 10.0);
}
catch (Exception ex)
{
MessageBox.Show(this, "Error building crossover: " + ex.Message);
return;
}
// Start creating filters...
CrossoverThreeWayFilter filter = new CrossoverThreeWayFilter(bpsConvert, crossover);
sampleTap = new SampleTap(filter, SAMPLE_LEN);
int crossoverIdx = 1;
if (rdoPlayWoofer.Checked)
{
crossoverIdx = 0;
}
else if (rdoPlayMidrange.Checked)
{
crossoverIdx = 1;
}
else if (rdoPlayTweeter.Checked)
{
crossoverIdx = 2;
}
channelSelectFilter = new SelectCrossover(sampleTap, crossoverIdx);
volumeControlFilter = new VolumeControl(channelSelectFilter);
// Only needed for playback through Windows
lastFilterStep = new ConvertBitsPerSample(volumeControlFilter, 16);
// Done creating filters...
tbarFilePosition.Value = 0;
// Max in seconds
tbarFilePosition.Maximum = (int)(lastFilterStep.Length / lastFilterStep.SampleRate / lastFilterStep.NumberOfChannels);
tbarFilePosition.Enabled = true;
// Playback through Windows
IWaveSource finalWaveSource = new FilterToWaveSource(lastFilterStep);
//_soundOut = new WasapiOut();
soundOutDevice = new WaveOut();
soundOutDevice.Initialize(finalWaveSource);
soundOutDevice.Play();
tmrUpdateViz.Start();
}
