/// <summary>
/// Split multi-channel WAV file into single channel WAV files.
/// </summary>
/// <param name="fileName">Input WAV file name.</param>
/// <param name="outputPath">Output WAV files path.</param>
/// <param name="ct">Cancellation token.</param>
/// <returns>The total processed bytes.</returns>
public long SplitWavFile(string fileName, string outputPath, CancellationToken ct)
{
long countBytesTotal = 0;
long countBytes = 0;
var fs = new FileStream(fileName, FileMode.Open, FileAccess.Read);
var header = WavFileInfo.ReadFileHeader(fs);
Progress(0.0);
countBytes += header.HeaderSize;
countBytesTotal += header.HeaderSize;
string fileNameOnly = Path.GetFileNameWithoutExtension(fileName);
string[] outputFileNames = new string[header.NumChannels];
WavChannel[] channels = new WavChannel[header.NumChannels];
int countChannels = 0;
if (header.IsExtensible == false)
{
for (int c = 0; c < header.NumChannels; c++)
{
string numnber = (c + 1).ToString("D2");
var ch = new WavChannel("Channel" + numnber, "CH" + numnber, 0);
channels[c] = ch;
}
}
else
{
foreach (WavChannel ch in WavFileHeader.WavMultiChannelTypes)
{
if (((uint)ch.Mask & header.ChannelMask) != 0)
{
channels[countChannels++] = ch;
}
}
}
for (int p = 0; p < channels.Count(); p++)
{
outputFileNames[p] = outputPath + fileNameOnly + "." + channels[p].ShortName + ".wav";
}
long dataSize = header.Subchunk2Size;
int bufferSize = (int)header.ByteRate;
int channelBufferSize = (int)(header.ByteRate / header.NumChannels);
byte[] buffer = new byte[bufferSize];
byte[][] channelBuffer = new byte[header.NumChannels][];
int copySize = header.BlockAlign / header.NumChannels;
var outputFiles = new FileStream[header.NumChannels];
var mh = WavFileInfo.GetMonoWavFileHeader(header);
for (int c = 0; c < header.NumChannels; c++)
{
channelBuffer[c] = new byte[channelBufferSize];
outputFiles[c] = new FileStream(outputFileNames[c], FileMode.Create, FileAccess.ReadWrite);
WavFileInfo.WriteFileHeader(outputFiles[c], mh);
}
var cleanUp = new Action(() =>
{
fs.Dispose();
for (int c = 0; c < header.NumChannels; c++)
{
outputFiles[c].Dispose();
}
});
for (long i = 0; i < dataSize; i += bufferSize)
{
int n = fs.Read(buffer, 0, bufferSize);
if (n > 0)
{
int[] count = new int[header.NumChannels];
for (int j = 0; j < n; j += header.BlockAlign)
{
for (int c = 0; c < header.NumChannels; c++)
{
for (int k = 0; k < copySize; k++)
{
channelBuffer[c][count[c]++] = buffer[j + (c * copySize) + k];
}
}
}
for (int c = 0; c < header.NumChannels; c++)
{
outputFiles[c].Write(channelBuffer[c], 0, count[c]);
}
if (ct.IsCancellationRequested)
{
cleanUp();
ct.ThrowIfCancellationRequested();
}
countBytes += n;
countBytesTotal += n;
Progress((countBytes / fs.Length) * 100.0);
}
}
cleanUp();
return(countBytesTotal);
}
/// <summary>
/// Split multi-channel WAV file into single channel WAV files.
/// </summary>
/// <param name="fileName">Input WAV file name.</param>
/// <param name="outputPath">Output WAV files path.</param>
/// <param name="ct">Cancellation token.</param>
/// <returns>The total processed bytes.</returns>
public long SplitWavFile(string fileName, string outputPath, CancellationToken ct)
{
long countBytesTotal = 0;
long countBytes = 0;
var fs = new FileStream(fileName, FileMode.Open, FileAccess.Read);
var header = WavFileInfo.ReadFileHeader(fs);
Progress(0.0);
countBytes += header.HeaderSize;
countBytesTotal += header.HeaderSize;
string fileNameOnly = Path.GetFileNameWithoutExtension(fileName);
string[] outputFileNames = new string[header.NumChannels];
WavChannel[] channels = new WavChannel[header.NumChannels];
int countChannels = 0;
if (header.IsExtensible == false)
{
for (int c = 0; c < header.NumChannels; c++)
{
string chNum = (c + 1).ToString("D2");
var ch = new WavChannel("Channel" + chNum, "CH" + chNum, 0);
channels[c] = ch;
}
}
else
{
foreach (WavChannel ch in WavFileHeader.WavMultiChannelTypes)
{
if (((uint)ch.Mask & header.ChannelMask) != 0)
{
channels[countChannels++] = ch;
}
}
}
for (int p = 0; p < channels.Count(); p++)
{
outputFileNames[p] = outputPath + fileNameOnly + "." + channels[p].ShortName + ".wav";
}
long dataSize = header.Subchunk2Size;
int bufferSize = (int)header.ByteRate;
int channelBufferSize = (int)(header.ByteRate / header.NumChannels);
byte[] buffer = new byte[bufferSize];
byte[][] channelBuffer = new byte[header.NumChannels][];
int copySize = header.BlockAlign / header.NumChannels;
var outputFiles = new FileStream[header.NumChannels];
var mh = WavFileInfo.GetMonoWavFileHeader(header);
for (int c = 0; c < header.NumChannels; c++)
{
channelBuffer[c] = new byte[channelBufferSize];
outputFiles[c] = new FileStream(outputFileNames[c], FileMode.Create, FileAccess.ReadWrite);
WavFileInfo.WriteFileHeader(outputFiles[c], mh);
}
var cleanUp = new Action(() =>
{
fs.Close();
fs.Dispose();
for (int c = 0; c < header.NumChannels; c++)
{
outputFiles[c].Close();
outputFiles[c].Dispose();
}
});
for (long i = 0; i < dataSize; i += bufferSize)
{
int n = fs.Read(buffer, 0, bufferSize);
if (n > 0)
{
int[] count = new int[header.NumChannels];
for (int j = 0; j < n; j += header.BlockAlign)
{
for (int c = 0; c < header.NumChannels; c++)
{
for (int k = 0; k < copySize; k++)
{
channelBuffer[c][count[c]++] = buffer[j + (c * copySize) + k];
}
}
}
for (int c = 0; c < header.NumChannels; c++)
{
outputFiles[c].Write(channelBuffer[c], 0, count[c]);
}
if (ct.IsCancellationRequested)
{
cleanUp();
ct.ThrowIfCancellationRequested();
}
countBytes += n;
countBytesTotal += n;
Progress((countBytes / fs.Length) * 100.0);
}
}
cleanUp();
return countBytesTotal;
}