public static void ReadAiffHeader(Stream stream, out WaveFormat format, out long dataChunkPosition, out int dataChunkLength, List<AiffFileReader.AiffChunk> chunks)
{
dataChunkPosition = -1L;
format = null;
BinaryReader binaryReader = new BinaryReader(stream);
if (AiffFileReader.ReadChunkName(binaryReader) != "FORM")
{
throw new FormatException("Not an AIFF file - no FORM header.");
}
AiffFileReader.ConvertInt(binaryReader.ReadBytes(4));
string a = AiffFileReader.ReadChunkName(binaryReader);
if (a != "AIFC" && a != "AIFF")
{
throw new FormatException("Not an AIFF file - no AIFF/AIFC header.");
}
dataChunkLength = 0;
while (binaryReader.BaseStream.Position < binaryReader.BaseStream.Length)
{
AiffFileReader.AiffChunk aiffChunk = AiffFileReader.ReadChunkHeader(binaryReader);
if (aiffChunk.ChunkName == "\0\0\0\0" || binaryReader.BaseStream.Position + (long)((ulong)aiffChunk.ChunkLength) > binaryReader.BaseStream.Length)
{
break;
}
if (aiffChunk.ChunkName == "COMM")
{
short channels = AiffFileReader.ConvertShort(binaryReader.ReadBytes(2));
AiffFileReader.ConvertInt(binaryReader.ReadBytes(4));
short bits = AiffFileReader.ConvertShort(binaryReader.ReadBytes(2));
double num = IEEE.ConvertFromIeeeExtended(binaryReader.ReadBytes(10));
format = new WaveFormat((int)num, (int)bits, (int)channels);
if (aiffChunk.ChunkLength > 18u && a == "AIFC")
{
if (new string(binaryReader.ReadChars(4)).ToLower() != "none")
{
throw new FormatException("Compressed AIFC is not supported.");
}
binaryReader.ReadBytes((int)(aiffChunk.ChunkLength - 22u));
}
else
{
binaryReader.ReadBytes((int)(aiffChunk.ChunkLength - 18u));
}
}
else if (aiffChunk.ChunkName == "SSND")
{
uint num2 = AiffFileReader.ConvertInt(binaryReader.ReadBytes(4));
AiffFileReader.ConvertInt(binaryReader.ReadBytes(4));
dataChunkPosition = (long)((ulong)(aiffChunk.ChunkStart + 16u + num2));
dataChunkLength = (int)(aiffChunk.ChunkLength - 8u);
binaryReader.BaseStream.Position += (long)((ulong)(aiffChunk.ChunkLength - 8u));
}
else
{
if (chunks != null)
{
chunks.Add(aiffChunk);
}
binaryReader.BaseStream.Position += (long)((ulong)aiffChunk.ChunkLength);
}
}
if (format == null)
{
throw new FormatException("Invalid AIFF file - No COMM chunk found.");
}
if (dataChunkPosition == -1L)
{
throw new FormatException("Invalid AIFF file - No SSND chunk found.");
}
}
private static AiffFileReader.AiffChunk ReadChunkHeader(BinaryReader br)
{
return new AiffFileReader.AiffChunk((uint)br.BaseStream.Position, AiffFileReader.ReadChunkName(br), AiffFileReader.ConvertInt(br.ReadBytes(4)));
}