public void OpenFile(string path)
{
Stop();
if (ActiveStream != null)
{
SelectionBegin = TimeSpan.Zero;
SelectionEnd = TimeSpan.Zero;
ChannelPosition = 0;
}
StopAndCloseStream();
if (System.IO.File.Exists(path))
{
try
{
waveOutDevice = new WaveOut()
{
DesiredLatency = 100
};
waveOutDevice.PlaybackStopped += OnPlaybackStopped;
ActiveStream = new Mp3FileReader(path);
inputStream = new WaveChannel32(ActiveStream);
sampleAggregator = new SampleAggregator(fftDataSize);
inputStream.Sample += inputStream_Sample;
waveOutDevice.Init(inputStream);
ChannelLength = inputStream.TotalTime.TotalSeconds;
FileTag = TagLib.File.Create(path);
GenerateWaveformData(path);
CanPlay = true;
}
catch
{
ActiveStream = null;
CanPlay = false;
throw;
}
}
}
private void waveformGenerateWorker_DoWork(object sender, DoWorkEventArgs e)
{
var waveformParams = (WaveformGenerationParams)e.Argument;
float[] waveformDataFromCache;
if (waveformDataCache.TryGet(waveformParams.Path, out waveformDataFromCache))
{
Application.Current.Dispatcher.Invoke(() => WaveformData = waveformDataFromCache);
return;
}
Mp3FileReader waveformMp3Stream = new Mp3FileReader(waveformParams.Path);
WaveChannel32 waveformInputStream = new WaveChannel32(waveformMp3Stream);
waveformInputStream.Sample += waveStream_Sample;
int frameLength = fftDataSize;
int frameCount = (int)((double)waveformInputStream.Length / (double)frameLength);
int waveformLength = frameCount * 2;
byte[] readBuffer = new byte[frameLength];
waveformAggregator = new SampleAggregator(frameLength);
float maxLeftPointLevel = float.MinValue;
float maxRightPointLevel = float.MinValue;
int currentPointIndex = 0;
float[] waveformCompressedPoints = new float[waveformParams.Points];
List<float> waveformData = new List<float>();
List<int> waveMaxPointIndexes = new List<int>();
for (int i = 1; i <= waveformParams.Points; i++)
{
waveMaxPointIndexes.Add((int)Math.Round(waveformLength * ((double)i / (double)waveformParams.Points), 0));
}
int readCount = 0;
while (currentPointIndex * 2 < waveformParams.Points)
{
waveformInputStream.Read(readBuffer, 0, readBuffer.Length);
waveformData.Add(waveformAggregator.LeftMaxVolume);
waveformData.Add(waveformAggregator.RightMaxVolume);
if (waveformAggregator.LeftMaxVolume > maxLeftPointLevel)
maxLeftPointLevel = waveformAggregator.LeftMaxVolume;
if (waveformAggregator.RightMaxVolume > maxRightPointLevel)
maxRightPointLevel = waveformAggregator.RightMaxVolume;
if (readCount > waveMaxPointIndexes[currentPointIndex])
{
waveformCompressedPoints[(currentPointIndex * 2)] = maxLeftPointLevel;
waveformCompressedPoints[(currentPointIndex * 2) + 1] = maxRightPointLevel;
maxLeftPointLevel = float.MinValue;
maxRightPointLevel = float.MinValue;
currentPointIndex++;
}
if (readCount % 3000 == 0)
{
float[] clonedData = (float[])waveformCompressedPoints.Clone();
try
{
App.Current.Dispatcher.Invoke(new Action(() =>
{
WaveformData = clonedData;
}));
}
catch (TaskCanceledException)
{
e.Cancel = true;
return;
}
}
if (waveformGenerateWorker.CancellationPending)
{
e.Cancel = true;
break;
}
readCount++;
}
float[] finalClonedData = (float[])waveformCompressedPoints.Clone();
// Don't cache half-finished waveforms (my CDJ-1000MK3s do this...)
if (!waveformGenerateWorker.CancellationPending)
waveformDataCache.Add(waveformParams.Path, finalClonedData);
App.Current.Dispatcher.Invoke(new Action(() =>
{
fullLevelData = waveformData.ToArray();
WaveformData = finalClonedData;
}));
waveformInputStream.Close();
waveformInputStream.Dispose();
waveformInputStream = null;
waveformMp3Stream.Close();
waveformMp3Stream.Dispose();
waveformMp3Stream = null;
}