public static RiffWaveChunk FromPcmAudio(PcmAudio pcmAudio)
{
IEnumerable <double>[] blocks = pcmAudio.Blocks.ToArray();
RiffFormatChunk formatChunk = new RiffFormatChunk((ushort)pcmAudio.Channels.Count(), (ushort)(blocks.Length / pcmAudio.Length), 16);
byte[] data = new byte[formatChunk.BlockSize * blocks.Length];
int position = 0;
for (int blockIndex = 0; blockIndex < blocks.Length; blockIndex++)
{
double[] samples = blocks[blockIndex].ToArray();
for (int sampleIndex = 0; sampleIndex < samples.Length; sampleIndex++)
{
if (samples[sampleIndex] < -1 || samples[sampleIndex] >= +1)
{
throw new InvalidDataException(string.Format("Sample at index {0} was out of range ({1}).", sampleIndex, samples[sampleIndex]));
}
foreach (byte part in BitConverter.GetBytes((short)(samples[sampleIndex] * 0x8000)))
{
data[position++] = part;
}
}
}
RiffDataChunk dataChunk = new RiffDataChunk(data);
return(new RiffWaveChunk(formatChunk, dataChunk));
}
public RiffWaveChunk(RiffFormatChunk formatChunk, RiffDataChunk dataChunk)
: base("RIFF", 4 + 8 + formatChunk.Size + 8 + dataChunk.Size + dataChunk.Size % 2)
{
if (formatChunk == null)
{
throw new ArgumentNullException("formatChunk");
}
if (dataChunk == null)
{
throw new ArgumentNullException("dataChunk");
}
this.riffID = "WAVE";
this.formatChunk = formatChunk;
this.dataChunk = dataChunk;
}
public RiffWaveChunk(BinaryReader reader)
: base(reader)
{
if (ID != "RIFF")
{
throw new InvalidDataException(string.Format("Wrong chunk ID '{0}', should be 'RIFF'.", ID));
}
this.riffID = Encoding.ASCII.GetString(reader.ReadBytes(4));
if (riffID != "WAVE")
{
throw new InvalidDataException(string.Format("Wrong RIFF ID '{0}', should be 'WAVE'.", riffID));
}
this.formatChunk = new RiffFormatChunk(reader);
this.dataChunk = new RiffDataChunk(reader);
if (Size != 4 + 8 + formatChunk.Size + 8 + dataChunk.Size + dataChunk.Size % 2)
{
throw new InvalidDataException(string.Format("Incorrect chunk size '{0}', should be '{1}'.", Size, 4 + 8 + formatChunk.Size + 8 + dataChunk.Size + dataChunk.Size % 2));
}
}
