public List<Onset> Detect(ISampleSource audio)
{
_onsets.Clear();
_completed = 0;
_sliceCount = 0;
_onsets = new List<float>();
_amplitudes = new List<float>();
var onsets = new List<Onset>();
//init detection specific variables
int sliceSampleSize = (int)Math.Ceiling(_options.SliceLength * audio.WaveFormat.SampleRate); //the size of each slice's sample
int slicePaddingSize = (int)Math.Ceiling(_options.SlicePaddingLength * audio.WaveFormat.SampleRate);
_sliceCount = (int)Math.Ceiling((float)audio.Length/audio.WaveFormat.Channels / sliceSampleSize); //the number of slices needed
var samples = (int)audio.Length / audio.WaveFormat.Channels;
//init parallel specific variables
var pOptions = new ParallelOptions();
if (_options.MaxDegreeOfParallelism != -1) pOptions.MaxDegreeOfParallelism = _options.MaxDegreeOfParallelism;
ParallelLoopState loopState;
List<Wav> wavSlices = new List<Wav>();
for (int i = 0; i < _sliceCount; i++)
{
int baseStart = i * sliceSampleSize;
int adjustedStart = (baseStart - sliceSampleSize > 0) ? baseStart - slicePaddingSize : 0;
int count = (sliceSampleSize + slicePaddingSize + baseStart > samples) ? samples - adjustedStart : sliceSampleSize + (baseStart - adjustedStart) + slicePaddingSize;
float delay = (float)adjustedStart / audio.WaveFormat.SampleRate;
float[] buffer = new float[count * audio.WaveFormat.Channels];
audio.SetPosition(TimeConverter.SampleSourceTimeConverter.ToTimeSpan(audio.WaveFormat, adjustedStart * audio.WaveFormat.Channels));
audio.Read(buffer, 0, count * audio.WaveFormat.Channels);
wavSlices.Add(new Wav(buffer, audio.WaveFormat.SampleRate, count, audio.WaveFormat.Channels) {
Delay = delay,
Padding = ((delay > 0) ? slicePaddingSize : 0) / audio.WaveFormat.SampleRate
});
}
int bucketSize = 5;
int bucketcount = (int)Math.Ceiling((double)wavSlices.Count / bucketSize);
MemoryAllocator _allocator = new MemoryAllocator();
for (int i = 0; i < bucketcount; i++)
{
_allocator.Reset();
int count = bucketSize;
if ((i + 1) * bucketSize > wavSlices.Count) count = wavSlices.Count - i * bucketSize;
if (count < 0) continue;
List<Wav> parallel = wavSlices.GetRange(i * bucketSize, count);
var ploopResult = Parallel.ForEach(parallel, pOptions, (w, state) => GetOnsets(w, _allocator));
if (!ploopResult.IsCompleted) throw new Exception();
}
onsets = _onsets.Zip(_amplitudes, (onset, amplitude) => new Onset { OnsetTime = onset, OnsetAmplitude = amplitude }).ToList();
onsets = onsets.OrderBy(f => f.OnsetTime).ToList();
float prev = 0;
float combine = 0.03f;
var ret = new List<Onset>();
for (int i = 0; i < onsets.Count; i++)
{
if (onsets[i].OnsetTime - prev < _options.MinimumTimeDelta / 1000.0f)
continue;
prev = onsets[i].OnsetTime;
ret.Add(onsets[i]);
}
return ret;
}
public List <Onset> Detect(ISampleSource audio)
{
_onsets.Clear();
_completed = 0;
_sliceCount = 0;
_onsets = new List <float>();
_amplitudes = new List <float>();
var onsets = new List <Onset>();
//init detection specific variables
int sliceSampleSize = (int)Math.Ceiling(_options.SliceLength * audio.WaveFormat.SampleRate); //the size of each slice's sample
int slicePaddingSize = (int)Math.Ceiling(_options.SlicePaddingLength * audio.WaveFormat.SampleRate);
_sliceCount = (int)Math.Ceiling((float)audio.Length / audio.WaveFormat.Channels / sliceSampleSize); //the number of slices needed
var samples = (int)audio.Length / audio.WaveFormat.Channels;
//init parallel specific variables
var pOptions = new ParallelOptions();
if (_options.MaxDegreeOfParallelism != -1)
{
pOptions.MaxDegreeOfParallelism = _options.MaxDegreeOfParallelism;
}
ParallelLoopState loopState;
List <Wav> wavSlices = new List <Wav>();
for (int i = 0; i < _sliceCount; i++)
{
int baseStart = i * sliceSampleSize;
int adjustedStart = (baseStart - sliceSampleSize > 0) ? baseStart - slicePaddingSize : 0;
int count = (sliceSampleSize + slicePaddingSize + baseStart > samples) ? samples - adjustedStart : sliceSampleSize + (baseStart - adjustedStart) + slicePaddingSize;
float delay = (float)adjustedStart / audio.WaveFormat.SampleRate;
float[] buffer = new float[count * audio.WaveFormat.Channels];
audio.SetPosition(TimeConverter.SampleSourceTimeConverter.ToTimeSpan(audio.WaveFormat, adjustedStart * audio.WaveFormat.Channels));
audio.Read(buffer, 0, count * audio.WaveFormat.Channels);
wavSlices.Add(new Wav(buffer, audio.WaveFormat.SampleRate, count, audio.WaveFormat.Channels)
{
Delay = delay,
Padding = ((delay > 0) ? slicePaddingSize : 0) / audio.WaveFormat.SampleRate
});
}
int bucketSize = 5;
int bucketcount = (int)Math.Ceiling((double)wavSlices.Count / bucketSize);
MemoryAllocator _allocator = new MemoryAllocator();
for (int i = 0; i < bucketcount; i++)
{
_allocator.Reset();
int count = bucketSize;
if ((i + 1) * bucketSize > wavSlices.Count)
{
count = wavSlices.Count - i * bucketSize;
}
if (count < 0)
{
continue;
}
List <Wav> parallel = wavSlices.GetRange(i * bucketSize, count);
var ploopResult = Parallel.ForEach(parallel, pOptions, (w, state) => GetOnsets(w, _allocator));
if (!ploopResult.IsCompleted)
{
throw new Exception();
}
}
onsets = _onsets.Zip(_amplitudes, (onset, amplitude) => new Onset {
OnsetTime = onset, OnsetAmplitude = amplitude
}).ToList();
onsets = onsets.OrderBy(f => f.OnsetTime).ToList();
float prev = 0;
float combine = 0.03f;
var ret = new List <Onset>();
for (int i = 0; i < onsets.Count; i++)
{
if (onsets[i].OnsetTime - prev < _options.MinimumTimeDelta / 1000.0f)
{
continue;
}
prev = onsets[i].OnsetTime;
ret.Add(onsets[i]);
}
return(ret);
}
