private WaveChannel32 CreateInputStream(string fileName)
{
WaveChannel32 inputStream;
if (fileName.EndsWith(".wav"))
{
WaveStream readerStream = new WaveFileReader(fileName);
if (readerStream.WaveFormat.Encoding != WaveFormatEncoding.Pcm)
{
readerStream = WaveFormatConversionStream.CreatePcmStream(readerStream);
readerStream = new BlockAlignReductionStream(readerStream);
}
if (readerStream.WaveFormat.BitsPerSample != 16)
{
var format = new WaveFormat(readerStream.WaveFormat.SampleRate, 16, readerStream.WaveFormat.Channels);
readerStream = new WaveFormatConversionStream(format, readerStream);
}
inputStream = new WaveChannel32(readerStream);
}
else if (fileName.EndsWith(".mp3"))
{
WaveStream mp3Reader = new Mp3FileReader(fileName);
WaveStream pcmStream = WaveFormatConversionStream.CreatePcmStream(mp3Reader);
WaveStream blockAlignedStream = new BlockAlignReductionStream(pcmStream);
inputStream = new WaveChannel32(blockAlignedStream);
}
else
{
throw new InvalidOperationException("Unsupported audio extension");
}
return inputStream;
}