public VorbisCachedSound(Stream sound)
{
using (var audioFileReader = new VorbisWaveReader(sound))
{
// TODO: could add resampling in here if required
WaveFormat = audioFileReader.WaveFormat;
var sp = audioFileReader.ToSampleProvider();
var wholeFile = new List <float>((int)(audioFileReader.Length / 4));
var sourceSamples = (int)(audioFileReader.Length / (audioFileReader.WaveFormat.BitsPerSample / 8));
var sampleData = new float[sourceSamples];
int samplesRead;
while ((samplesRead = sp.Read(sampleData, 0, sourceSamples)) > 0)
{
wholeFile.AddRange(sampleData.Take(samplesRead));
}
AudioData = wholeFile.ToArray();
}
}
public BPMDetector(string audioFile, int start = 0, int length = 0)
{
// Load the file
if (Path.GetExtension(audioFile) == ".ogg" || Path.GetExtension(audioFile) == ".egg")
{
using (VorbisWaveReader reader = new VorbisWaveReader(audioFile))
{
// Originally the sample rate was constant (44100), and the number of channels was 2.
// Let's just in case take them from file's properties
sampleRate = reader.WaveFormat.SampleRate;
channels = reader.WaveFormat.Channels;
int bytesPerSample = reader.WaveFormat.BitsPerSample / 8;
if (bytesPerSample == 0)
{
bytesPerSample = 2; // assume 16 bit
}
int sampleCount = (int)reader.Length / bytesPerSample;
// Read the wave data
start *= channels * sampleRate;
length *= channels * sampleRate;
if (start >= sampleCount)
{
groups = new BPMGroup[0];
return;
}
if (length == 0 || start + length >= sampleCount)
{
length = sampleCount - start;
}
length = (int)(length / channels) * channels;
ISampleProvider sampleReader = reader.ToSampleProvider();
float[] samples = new float[length];
sampleReader.Read(samples, start, length);
// Beats, or kicks, generally occur around the 100 to 150 hz range.
// Below this is often the bassline. So let's focus just on that.
for (int ch = 0; ch < channels; ++ch)
{
// First a lowpass to remove most of the song.
BiQuadFilter lowpass = BiQuadFilter.LowPassFilter(sampleRate, 150.0F, 1.0F);
// Now a highpass to remove the bassline.
BiQuadFilter highpass = BiQuadFilter.HighPassFilter(sampleRate, 100.0F, 1.0F);
for (int i = ch; i < length; i += channels)
{
samples[i] = highpass.Transform(lowpass.Transform(samples[i]));
}
}
Peak[] peaks = getPeaks(samples);
BPMGroup[] allGroups = getIntervals(peaks);
Array.Sort(allGroups, (x, y) => y.Count.CompareTo(x.Count));
if (allGroups.Length > 5)
{
Array.Resize(ref allGroups, 5);
}
this.groups = allGroups;
}
}
else
{
using (MediaFoundationReader reader = new MediaFoundationReader(audioFile))
{
// Originally the sample rate was constant (44100), and the number of channels was 2.
// Let's just in case take them from file's properties
sampleRate = reader.WaveFormat.SampleRate;
channels = reader.WaveFormat.Channels;
int bytesPerSample = reader.WaveFormat.BitsPerSample / 8;
if (bytesPerSample == 0)
{
bytesPerSample = 2; // assume 16 bit
}
int sampleCount = (int)reader.Length / bytesPerSample;
// Read the wave data
start *= channels * sampleRate;
length *= channels * sampleRate;
if (start >= sampleCount)
{
groups = new BPMGroup[0];
return;
}
if (length == 0 || start + length >= sampleCount)
{
length = sampleCount - start;
}
length = (int)(length / channels) * channels;
ISampleProvider sampleReader = reader.ToSampleProvider();
float[] samples = new float[length];
sampleReader.Read(samples, start, length);
// Beats, or kicks, generally occur around the 100 to 150 hz range.
// Below this is often the bassline. So let's focus just on that.
for (int ch = 0; ch < channels; ++ch)
{
// First a lowpass to remove most of the song.
BiQuadFilter lowpass = BiQuadFilter.LowPassFilter(sampleRate, 150.0F, 1.0F);
// Now a highpass to remove the bassline.
BiQuadFilter highpass = BiQuadFilter.HighPassFilter(sampleRate, 100.0F, 1.0F);
for (int i = ch; i < length; i += channels)
{
samples[i] = highpass.Transform(lowpass.Transform(samples[i]));
}
}
Peak[] peaks = getPeaks(samples);
BPMGroup[] allGroups = getIntervals(peaks);
Array.Sort(allGroups, (x, y) => y.Count.CompareTo(x.Count));
if (allGroups.Length > 5)
{
Array.Resize(ref allGroups, 5);
}
this.groups = allGroups;
}
}
}
