public static byte[] Resample(this WaveFormat waveFormat, byte[] data, WaveFormat outputFormat)
{
if (waveFormat.Equals(outputFormat))
{
return(data);
}
if (outputFormat.Encoding != WaveFormatEncoding.IeeeFloat)
{
throw new NotSupportedException("Only float supported.");
}
if (outputFormat.Channels > 1)
{
throw new NotSupportedException("Only mono supported.");
}
var sampleProvider = waveFormat.GetSampleProvider(data);
if (waveFormat.Channels > 1)
{
sampleProvider = new StereoToMonoSampleProvider(sampleProvider);
}
var numSamples = waveFormat.SampleRate;
var buffer = new float[numSamples];
var samples = new List <float>();
var samplesRead = sampleProvider.Read(buffer, 0, buffer.Length);
while (samplesRead > 0)
{
var floats = samplesRead == buffer.Length ? buffer : buffer.Take(samplesRead).ToArray();
samples.AddRange(floats);
samplesRead = sampleProvider.Read(buffer, 0, buffer.Length);
}
buffer = samples.Resampled(waveFormat.SampleRate, outputFormat.SampleRate);
var output = new byte[buffer.Length * sizeof(float)];
var waveBuffer = new WaveBuffer(output);
for (var i = 0; i < buffer.Length; i++)
{
waveBuffer.FloatBuffer[i] = buffer[i];
}
return(output);
}
public PeakInfo[] Sample(WaveFormat waveFormat, byte[] data)
{
var sampleProvider = waveFormat.GetSampleProvider(data);
var numSamples = waveFormat.SampleRate * waveFormat.Channels / PeaksPerSecond;
var samples = new float[numSamples];
var peaks = new List <PeakInfo>();
var samplesRead = sampleProvider.Read(samples, 0, samples.Length);
// only full buffers, so we get "exactly" #PeaksPerSecond peaks
while (samplesRead > 0)
{
var floats = samplesRead == samples.Length ? samples : samples.Take(samplesRead).ToArray();
var peak = GetPeaks(waveFormat, floats);
peaks.Add(peak);
samplesRead = sampleProvider.Read(samples, 0, samples.Length);
}
return(peaks.ToArray());
}
