| public WaveReader ( Stream stream ) : System | ||
| stream | Stream | Input WAVE file stream |
| return | System | |
public WaveReader(Stream stream)
{
BinaryReader br = new BinaryReader(stream);
try
{
if (new string(br.ReadChars(4)).ToUpper() == "RIFF")
{
int length = br.ReadInt32();
if (new string(br.ReadChars(4)).ToUpper() == "WAVE")
{
string chunkName = new string(br.ReadChars(4)); //"fmt "
int chunkLength = br.ReadInt32();
this.CompressionCode = br.ReadInt16(); //1 for PCM/uncompressed
this.NumberOfChannels = br.ReadInt16();
this.SampleRate = br.ReadInt32();
this.AverageBytesPerSecond = br.ReadInt32();
this.BlockAlign = br.ReadInt16();
this.SignificantBitsPerSample = br.ReadInt16();
if (this.SignificantBitsPerSample == 0)
throw new Exception("The input stream uses an unhandled SignificantBitsPerSample parameter");
if (chunkLength > 16)
{
br.ReadChars(chunkLength - 16);
}
chunkName = new string(br.ReadChars(4));
try
{
while (chunkName.ToLower() != "data")
{
br.ReadChars(br.ReadInt32());
chunkName = new string(br.ReadChars(4));
}
}
catch
{
throw new Exception("Input stream misses the data chunk");
}
chunkLength = br.ReadInt32();
try
{
this.Frames = 8 * (chunkLength / this.SignificantBitsPerSample) / this.NumberOfChannels;
}
catch
{
throw new Exception("The input stream has zero channels");
}
this.TimeLength = ((double)this.Frames) / ((double)this.SampleRate);
this.Data = new Int32[this.NumberOfChannels][];
for (int j = 0; j < this.NumberOfChannels; j++)
{
this.Data[j] = new Int32[this.Frames];
}
switch (SignificantBitsPerSample)
{
case 4:
Byte b = new Byte();
bool IsEven = true;
for (int i = 0; i < this.Frames; i++)
{
for (int j = 0; j < this.NumberOfChannels; j++)
{
if (IsEven)
{
b = br.ReadByte();
Data[j][i] = Convert.ToInt32((b >> 4) & 0x0F);
}
else
{
Data[j][i] = Convert.ToInt32(b & 0x0F);
}
IsEven = !IsEven;
}
}
break;
case 8:
for (int i = 0; i < this.Frames; i++)
{
for (int j = 0; j < this.NumberOfChannels; j++)
{
Data[j][i] = Convert.ToInt32(br.ReadByte());
}
}
break;
case 16:
for (int i = 0; i < this.Frames; i++)
{
for (int j = 0; j < this.NumberOfChannels; j++)
{
Data[j][i] = br.ReadInt16();
}
}
break;
case 24:
for (int i = 0; i < this.Frames; i++)
{
for (int j = 0; j < this.NumberOfChannels; j++)
{
Byte[] int24 = br.ReadBytes(3);
Data[j][i] = Convert.ToInt32(int24[0]) + (Convert.ToInt32(int24[1]) << 8) + (Convert.ToInt32(int24[3]) << 16);
}
}
break;
case 32:
for (int i = 0; i < Frames; i++)
{
for (int j = 0; j < this.NumberOfChannels; j++)
{
Data[j][i] = br.ReadInt32();
}
}
break;
default:
throw new Exception("The input stream uses an unhandled SignificantBitsPerSample parameter");
}
}
else
{
throw new Exception("Input stream doesn't comply with the WAVE specification");
}
}
else
{
throw new Exception("Input stream doesn't comply with the RIFF specification");
}
}
finally
{
br.Close();
}
}