/// <summary>
/// Creates a new WEMDataChunk from a binary reader.<para/>
/// ENSURE YOU'RE CALLING IN THE RIGHT ORDER: WEMHeader => WEMFormatChunk => WEMDataChunk.
/// </summary>
/// <param name="reader">The <see cref="BinaryReader"/> to take the data from.</param>
/// <returns></returns>
public static WEMDataChunk CreateFromStream(BinaryReader reader, WEMFormatChunk fmtChunk)
{
WEMDataChunk data = new WEMDataChunk(fmtChunk);
// Make sure we're in the right place.
char[] id = reader.ReadChars(4);
string idAsString = string.Concat(id);
while (idAsString != ID)
{
Console.WriteLine("Unexpected ID when trying to create format chunk (got [" + idAsString + "], expecting [" + ID + "] || CURRENT POS: " + reader.BaseStream.Position + ")");
int size = reader.ReadInt32();
reader.BaseStream.Seek(size, SeekOrigin.Current);
id = reader.ReadChars(4);
idAsString = string.Concat(id);
}
uint length = reader.ReadUInt32();
data.Data = new short[length / 2];
byte[] raw = new byte[length];
reader.Read(raw, 0, raw.Length);
for (int i = 0; i < raw.Length; i += 2)
{
byte b0 = raw[i];
byte b1 = raw[i + 1];
short val = (short)((b1 << 8) + b0);
data.Data[i / 2] = val;
}
return(data);
}
/// <summary>
/// Creates a new WEMFormatChunk from a binary reader.<para/>
/// ENSURE YOU'RE CALLING IN THE RIGHT ORDER: WEMHeader => WEMFormatChunk => WEMDataChunk.
/// </summary>
/// <param name="reader">The <see cref="BinaryReader"/> to take the data from.</param>
/// <returns></returns>
public static WEMFormatChunk CreateFromStream(BinaryReader reader)
{
WEMFormatChunk fmtChunk = new WEMFormatChunk();
// Make sure we're in the right place.
char[] id = reader.ReadChars(4);
string idAsString = string.Concat(id);
//Console.WriteLine(idAsString);
while (idAsString != ID)
{
Console.WriteLine("Unexpected ID when trying to create format chunk (got [" + idAsString + "], expecting [" + ID + "] || CURRENT POS: " + reader.BaseStream.Position + ")");
int size = reader.ReadInt32();
reader.BaseStream.Seek(size, SeekOrigin.Current);
id = reader.ReadChars(4);
idAsString = string.Concat(id);
}
int objSize = reader.ReadInt32();
// Now here is where things get important. Size *is* variable, contrary to what I thought. It just has a default value that may be overwritten.
long currentPos = reader.BaseStream.Position;
reader.ReadUInt16(); // Skip format tag. This is so that casting works fine.
fmtChunk.Channels = reader.ReadUInt16();
fmtChunk.SampleRate = reader.ReadUInt32();
reader.ReadUInt32(); // Skip avg bytes / sec
reader.ReadUInt16(); // Skip frame size
reader.ReadUInt16(); //fmtChunk.BitsPerSample = reader.ReadUInt16();
// And skip the necessary amount of bytes
reader.BaseStream.Seek(currentPos + objSize, SeekOrigin.Begin);
return(fmtChunk);
}
/// <summary>
/// Construct a new WEM Data chunk. Requires a pre-existing Format Chunk
/// </summary>
/// <param name="formatInfo"></param>
public WEMDataChunk(WEMFormatChunk formatInfo)
{
FormatChunk = formatInfo;
}