public static bool LoadSound(Stream s, out Func <Stream> result, out short channels, out int sampleBits, out int sampleRate)
{
result = null;
channels = -1;
sampleBits = -1;
sampleRate = -1;
var type = s.ReadASCII(4);
if (type != "RIFF")
{
return(false);
}
s.ReadInt32(); // File-size
var format = s.ReadASCII(4);
if (format != "WAVE")
{
return(false);
}
WaveType audioType = 0;
var dataOffset = -1L;
var dataSize = -1;
short blockAlign = -1;
int uncompressedSize = -1;
while (s.Position < s.Length)
{
if ((s.Position & 1) == 1)
{
s.ReadByte(); // Alignment
}
if (s.Position == s.Length)
{
break; // Break if we aligned with end of stream
}
var blockType = s.ReadASCII(4);
switch (blockType)
{
case "fmt ":
var fmtChunkSize = s.ReadInt32();
var audioFormat = s.ReadInt16();
audioType = (WaveType)audioFormat;
if (!Enum.IsDefined(typeof(WaveType), audioType))
{
throw new NotSupportedException("Compression type {0} is not supported.".F(audioFormat));
}
channels = s.ReadInt16();
sampleRate = s.ReadInt32();
s.ReadInt32(); // Byte Rate
blockAlign = s.ReadInt16();
sampleBits = s.ReadInt16();
s.ReadBytes(fmtChunkSize - 16);
break;
case "fact":
var chunkSize = s.ReadInt32();
uncompressedSize = s.ReadInt32();
s.ReadBytes(chunkSize - 4);
break;
case "data":
dataSize = s.ReadInt32();
dataOffset = s.Position;
s.Position += dataSize;
break;
case "LIST":
case "cue ":
var listCueChunkSize = s.ReadInt32();
s.ReadBytes(listCueChunkSize);
break;
default:
s.Position = s.Length; // Skip to end of stream
break;
}
}
if (audioType == WaveType.ImaAdpcm)
{
sampleBits = 16;
}
var chan = channels;
result = () =>
{
var audioStream = SegmentStream.CreateWithoutOwningStream(s, dataOffset, dataSize);
if (audioType == WaveType.ImaAdpcm)
{
return(new WavStream(audioStream, dataSize, blockAlign, chan, uncompressedSize));
}
return(audioStream); // Data is already PCM format.
};
return(true);
}
public Stream GetContent(PackageEntry entry)
{
return(SegmentStream.CreateWithoutOwningStream(s, dataStart + entry.Offset, (int)entry.Length));
}
public Stream GetStream(string filename)
{
var entry = index[filename];
return(SegmentStream.CreateWithoutOwningStream(s, entry.Offset, (int)entry.Size));
}