internal async Task CreateInputStreamAsync(ulong userId)
{
//Assume Thread-safe
if (!_streams.ContainsKey(userId))
{
var readerStream = new InputStream(); //Consumes header
var opusDecoder = new OpusDecodeStream(readerStream); //Passes header
//var jitterBuffer = new JitterBuffer(opusDecoder, _audioLogger);
var rtpReader = new RTPReadStream(opusDecoder); //Generates header
var decryptStream = new SodiumDecryptStream(rtpReader, this); //No header
_streams.TryAdd(userId, new StreamPair(readerStream, decryptStream));
await _streamCreatedEvent.InvokeAsync(userId, readerStream);
}
}
private async Task ProcessPacketAsync(byte[] packet)
{
try
{
if (_connection.State == ConnectionState.Connecting)
{
if (packet.Length != 70)
{
await _audioLogger.DebugAsync("Malformed Packet").ConfigureAwait(false);
return;
}
string ip;
int port;
try
{
ip = Encoding.UTF8.GetString(packet, 4, 70 - 6).TrimEnd('\0');
port = (packet[69] << 8) | packet[68];
}
catch (Exception ex)
{
await _audioLogger.DebugAsync("Malformed Packet", ex).ConfigureAwait(false);
return;
}
await _audioLogger.DebugAsync("Received Discovery").ConfigureAwait(false);
await ApiClient.SendSelectProtocol(ip, port).ConfigureAwait(false);
}
else if (_connection.State == ConnectionState.Connected)
{
if (packet.Length == 8)
{
await _audioLogger.DebugAsync("Received Keepalive").ConfigureAwait(false);
ulong value =
((ulong)packet[0] >> 0) |
((ulong)packet[1] >> 8) |
((ulong)packet[2] >> 16) |
((ulong)packet[3] >> 24) |
((ulong)packet[4] >> 32) |
((ulong)packet[5] >> 40) |
((ulong)packet[6] >> 48) |
((ulong)packet[7] >> 56);
while (_keepaliveTimes.TryDequeue(out var pair))
{
if (pair.Key == value)
{
int latency = Environment.TickCount - pair.Value;
int before = UdpLatency;
UdpLatency = latency;
await _udpLatencyUpdatedEvent.InvokeAsync(before, latency).ConfigureAwait(false);
break;
}
}
}
else
{
if (!RTPReadStream.TryReadSsrc(packet, 0, out var ssrc))
{
await _audioLogger.DebugAsync("Malformed Frame").ConfigureAwait(false);
return;
}
if (!_ssrcMap.TryGetValue(ssrc, out var userId))
{
await _audioLogger.DebugAsync($"Unknown SSRC {ssrc}").ConfigureAwait(false);
return;
}
if (!_streams.TryGetValue(userId, out var pair))
{
await _audioLogger.DebugAsync($"Unknown User {userId}").ConfigureAwait(false);
return;
}
try
{
await pair.Writer.WriteAsync(packet, 0, packet.Length).ConfigureAwait(false);
}
catch (Exception ex)
{
await _audioLogger.DebugAsync("Malformed Frame", ex).ConfigureAwait(false);
return;
}
//await _audioLogger.DebugAsync($"Received {packet.Length} bytes from user {userId}").ConfigureAwait(false);
}
}
}
catch (Exception ex)
{
await _audioLogger.WarningAsync("Failed to process UDP packet", ex).ConfigureAwait(false);
return;
}
}
