private ISampleProvider BuildWavePartAudio(UWavePart part, UProject project)
{
AudioFileReader stream;
try { stream = new AudioFileReader(part.FilePath); }
catch { return null; }
return new WaveToSampleProvider(stream);
}
public static float[] BuildPeaks(UWavePart part, System.ComponentModel.BackgroundWorker worker)
{
const double peaksRate = 4000;
System.Diagnostics.Stopwatch sw = new System.Diagnostics.Stopwatch();
sw.Start();
float[] peaks;
using (var stream = new AudioFileReader(part.FilePath))
{
int channels = part.Channels;
double peaksSamples = (int)((double)stream.Length / stream.WaveFormat.BlockAlign / stream.WaveFormat.SampleRate * peaksRate);
peaks = new float[(int)(peaksSamples + 1) * channels];
double blocksPerPixel = stream.Length / stream.WaveFormat.BlockAlign / peaksSamples;
var converted = new WaveToSampleProvider(stream);
float[] buffer = new float[4096];
int readed;
int readPos = 0;
int peaksPos = 0;
double bufferPos = 0;
float lmax = 0, lmin = 0, rmax = 0, rmin = 0;
while ((readed = converted.Read(buffer, 0, 4096)) != 0)
{
readPos += readed;
for (int i = 0; i < readed; i += channels)
{
lmax = Math.Max(lmax, buffer[i]);
lmin = Math.Min(lmin, buffer[i]);
if (channels > 1)
{
rmax = Math.Max(rmax, buffer[i + 1]);
rmin = Math.Min(rmin, buffer[i + 1]);
}
if (i > bufferPos)
{
lmax = -lmax; lmin = -lmin; rmax = -rmax; rmin = -rmin; // negate peaks to fipped waveform
peaks[peaksPos * channels] = lmax == 0 ? lmin : lmin == 0 ? lmax : (lmin + lmax) / 2;
peaks[peaksPos * channels + 1] = rmax == 0 ? rmin : rmin == 0 ? rmax : (rmin + rmax) / 2;
peaksPos++;
lmax = lmin = rmax = rmin = 0;
bufferPos += blocksPerPixel * stream.WaveFormat.Channels;
}
}
bufferPos -= readed;
worker.ReportProgress((int)((double)readPos * sizeof(float) * 100 / stream.Length));
}
}
sw.Stop();
System.Diagnostics.Debug.WriteLine("Build peaks {0} ms", sw.Elapsed.TotalMilliseconds);
return peaks;
}
public static UWavePart CreatePart(string filepath)
{
foreach(var part in DocManager.Inst.Project.Parts)
{
var _part = part as UWavePart;
if (_part != null && _part.FilePath == filepath)
{
return new UWavePart()
{
FilePath = filepath,
FileDurTick = _part.FileDurTick,
DurTick = _part.DurTick,
Channels = _part.Channels,
Peaks = _part.Peaks
};
}
}
WaveStream stream = null;
try
{
stream = new AudioFileReader(filepath);
}
catch
{
return null;
}
int durTick = DocManager.Inst.Project.MillisecondToTick(1000.0 * stream.Length / stream.WaveFormat.AverageBytesPerSecond);
UWavePart uwavepart = new UWavePart()
{
FilePath = filepath,
FileDurTick = durTick,
DurTick = durTick,
Channels = stream.WaveFormat.Channels
};
stream.Close();
return uwavepart;
}
