public ChannelStreamer(Protocol protocol, Media.File file, byte[] key, MusicStream output)
{
if (key.Length != (128 / 8))
{
output.AllAvailable = true;
throw new InvalidDataException("Encryption key for channel must be 128-bit.");
}
_cipher.BlockSize = 128;
_cipher.KeySize = 128;
_key = key;
_cipher.Mode = CipherMode.ECB; //CTR not available
_cipher.Padding = PaddingMode.None;
_output = output;
_file = file;
_protocol = protocol;
_channelLength = 160 * 1024 * 5 / 8; /* 160 kbit * 5 seconds. */
/* Send first substream request. */
string hash = this._cache.Hash(this._file, this._channelOffset, this._channelLength);
if (this._cache != null && this._cache.Contains("substream", hash))
{
this._cache.Load("substream", hash, this);
}
else
{
try
{
this._protocol.SendSubstreamRequest(this, this._file, this._channelOffset, this._channelLength);
}
catch (ProtocolException)
{
return;
}
}
}
public string Hash(Media.File file, int offset, int length)
{
return file.Id + "/" + offset + "-" + length;
}
