public static WavData ReadData(string fileName)
{
using (var fs = File.Open(fileName, FileMode.Open))
using (var reader = new BinaryReader(fs))
{
var descriptorChunk = new WavData.Descriptor
{
ChunkId = reader.ReadInt32(),
ChunkSize = reader.ReadInt32(),
Format = reader.ReadInt32()
};
var formatChunk = new WavData.Format
{
ChunkId = reader.ReadInt32(),
ChunkSize = reader.ReadInt32(),
AudioFormat = reader.ReadInt16(),
NumChannels = reader.ReadInt16(),
SampleRate = reader.ReadInt32(),
ByteRate = reader.ReadInt32(),
BlockAlign = reader.ReadInt16(),
BitsPerSample = reader.ReadInt16()
};
if (formatChunk.ChunkSize == 18)
{
var extraDataSize = reader.ReadInt16();
formatChunk.ExtraData = reader.ReadBytes(extraDataSize);
}
var dataChunk = new WavData.Data
{
ChunkId = reader.ReadInt32(),
ChunkSize = reader.ReadInt32(),
};
dataChunk.RawData = reader.ReadBytes(dataChunk.ChunkSize);
var samplesSize = dataChunk.ChunkSize / formatChunk.BytesPerSample;
var samples = new double[samplesSize];
switch (formatChunk.BitsPerSample)
{
case 64:
var samples64 = new long[samplesSize];
Buffer.BlockCopy(dataChunk.RawData, 0, samples64, 0, dataChunk.ChunkSize);
samples = Array.ConvertAll(samples64, e => (double)e);
break;
case 32:
var samples32 = new int[samplesSize];
Buffer.BlockCopy(dataChunk.RawData, 0, samples32, 0, dataChunk.ChunkSize);
samples = Array.ConvertAll(samples32, e => (double)e);
break;
case 16:
var samples16 = new short[samplesSize];
Buffer.BlockCopy(dataChunk.RawData, 0, samples16, 0, dataChunk.ChunkSize);
samples = Array.ConvertAll(samples16, e => (double)e);
break;
}
var numberOfChunks = samplesSize / SoundHelper.GetWindowSize(formatChunk.SampleRate);
var chunkedSamples = new double[numberOfChunks][];
for (int i = 0; i < numberOfChunks; i++)
{
chunkedSamples[i] = new double[SoundHelper.GetWindowSize(formatChunk.SampleRate)];
for (int j = 0; j < SoundHelper.GetWindowSize(formatChunk.SampleRate); j++)
{
chunkedSamples[i][j] = samples[SoundHelper.GetWindowSize(formatChunk.SampleRate) * i + j];
}
}
return(new WavData
{
DescriptorChunk = descriptorChunk,
FormatChunk = formatChunk,
DataChunk = dataChunk,
NumberOfChunks = numberOfChunks,
ChunkedSamples = chunkedSamples,
Samples = samples
});
}
}
