private void StartListener()
{
try
{
while (State > MediaConnectionState.NotConnected)
{
byte[] received = UdpClient.Receive(ref _localEndpoint);
if (BitConverter.ToInt16(new byte[] { received[1], received[0] }, 0) == 2)
{
string ip = "";
for (int i = 8; i < received.Length; i++)
{
if (received[i] == 0)
{
break;
}
else
{
ip += (char)received[i];
}
}
_localEndpoint = new IPEndPoint(IPAddress.Parse(ip), BitConverter.ToUInt16(new byte[] { received[received.Length - 1], received[received.Length - 2] }, 0));
SelectProtocol(_localEndpoint);
}
else if (received[0] == 0x80 || received[0] == 0x90)
{
while (SecretKey == null)
{
Thread.Sleep(100);
}
//Console.WriteLine($"{received[0]} {received[1]} {received[2]} {received[3]} {received[4]} {received[5]} {received[6]} {received[7]} {received[8]} {received[9]} {received[10]} {received[11]}");
/*
* var ok = RTPPacketHeader.Read(SecretKey, received, out var _);
*
* Console.WriteLine($"{ok.Type} {ok.Flags} {ok.Sequence} {ok.Timestamp} {ok.SSRC} {ok.HasExtensions}");
*/
// not much point in doing this rn since the decryption fails
if (_parentClient.Config.ParseIncomingRTPData)
{
try
{
var header = RTPPacketHeader.Read(SecretKey, received, out byte[] payload);
OnUdpPacket?.Invoke(this, new MediaPacketEventArgs(header, payload));
}
catch (SodiumException) { }
}
}
}
}
catch { }
UdpClient.Close();
}
private void StartListener()
{
int id = WebSocket.Id;
var client = UdpClient;
try
{
while (JustifyThread(id))
{
byte[] received = client.Receive(ref _localEndpoint);
if (BitConverter.ToInt16(new byte[] { received[1], received[0] }, 0) == 2)
{
string ip = "";
for (int i = 8; i < received.Length; i++)
{
if (received[i] == 0)
{
break;
}
else
{
ip += (char)received[i];
}
}
_localEndpoint = new IPEndPoint(IPAddress.Parse(ip), BitConverter.ToUInt16(new byte[] { received[received.Length - 1], received[received.Length - 2] }, 0));
WebSocket.SelectProtocol(_localEndpoint);
}
else if (received[0] == 0x80 || received[0] == 0x90)
{
while (SecretKey == null)
{
Thread.Sleep(100);
}
try
{
var header = RTPPacketHeader.Read(SecretKey, received, out byte[] payload);
HandlePacket(header, payload);
}
catch (SodiumException) { }
}
}
}
catch (Exception ex)
{
Log("Listener err: " + ex);
}
client?.Close();
Log("Killed listener for " + id);
}
public static RTPPacketHeader Read(byte[] secretKey, byte[] packet, out byte[] payload)
{
byte[] rawHeader = new byte[HeaderLength];
Buffer.BlockCopy(packet, 0, rawHeader, 0, rawHeader.Length);
RTPPacketHeader header = new RTPPacketHeader()
{
// Version = packet[0],
Type = packet[1],
Sequence = BitConverter.ToUInt16(new byte[] { rawHeader[3], rawHeader[2] }, 0),
Timestamp = BitConverter.ToUInt32(new byte[] { rawHeader[7], rawHeader[6], rawHeader[5], rawHeader[4] }, 0),
SSRC = BitConverter.ToUInt32(new byte[] { rawHeader[11], rawHeader[10], rawHeader[9], rawHeader[8] }, 0)
};
byte[] decrypted = new byte[packet.Length - HeaderLength - Sodium.LengthDifference];
byte[] nonce = new byte[rawHeader.Length * 2];
Buffer.BlockCopy(rawHeader, 0, nonce, 0, rawHeader.Length);
Sodium.Decrypt(packet, HeaderLength, packet.Length - HeaderLength, decrypted, 0, nonce, secretKey);
if (packet[0] == 0x90) // later on we might wanna check if index 3 (7 - 3 cuz big indian) is 1 to make anarchy's feature here live on for longer
{
header.ExtraExtensionData = new byte[ExtensionLength / 2];
Buffer.BlockCopy(decrypted, 0, header.ExtraExtensionData, 0, header.ExtraExtensionData.Length);
ushort extensionCount = BitConverter.ToUInt16(new byte[] { decrypted[3], decrypted[2] }, 0);
extensionCount++;
for (int i = 1; i < extensionCount; i++)
{
byte[] extension = new byte[ExtensionLength];
Buffer.BlockCopy(decrypted, i * ExtensionLength, extension, 0, ExtensionLength);
header.Extensions.Add(extension);
}
payload = new byte[decrypted.Length - extensionCount * ExtensionLength];
Buffer.BlockCopy(decrypted, extensionCount * ExtensionLength, payload, 0, payload.Length);
}
else
{
payload = decrypted;
}
return(header);
}
public int Write(byte[] buffer, int offset)
{
if (Session.State != MediaSessionState.Authenticated)
{
throw new InvalidOperationException("Connection has been closed.");
}
lock (Session.VoiceLock)
{
if (_nextTick == -1)
{
_nextTick = Environment.TickCount;
}
else
{
long distance = _nextTick - Environment.TickCount;
if (distance > 0)
{
Thread.Sleep((int)distance);
}
}
byte[] opusFrame = new byte[OpusEncoder.FrameBytes];
int frameSize = _encoder.EncodeFrame(buffer, offset, opusFrame, 0);
byte[] packet = new RTPPacketHeader()
{
// Version = 0x80,
Type = DiscordMediaSession.SupportedCodecs["opus"].PayloadType,
Sequence = Session.Sequence,
Timestamp = Session.Timestamp,
SSRC = Session.SSRC.Audio
}.Write(Session.SecretKey, opusFrame, 0, frameSize);
Session.UdpClient.Send(packet, packet.Length);
_nextTick += OpusEncoder.TimeBetweenFrames;
Session.Sequence++;
Session.Timestamp += OpusEncoder.FrameSamplesPerChannel;
}
return(offset + OpusEncoder.FrameBytes);
}
public int Write(byte[] buffer, int offset)
{
if (_client.State < MediaConnectionState.Ready)
{
throw new InvalidOperationException("Client is not currently connected");
}
lock (_voiceLock)
{
if (_nextTick == -1)
{
_nextTick = Environment.TickCount;
}
else
{
long distance = _nextTick - Environment.TickCount;
if (distance > 0)
{
Thread.Sleep((int)distance);
}
}
byte[] opusFrame = new byte[OpusConverter.FrameBytes];
int frameSize = _encoder.EncodeFrame(buffer, offset, opusFrame, 0);
byte[] packet = new RTPPacketHeader()
{
Type = DiscordMediaConnection.SupportedCodecs["opus"].PayloadType,
Sequence = _sequence,
Timestamp = _timestamp,
SSRC = _client.Connection.SSRC.Audio
}.Write(_client.Connection.SecretKey, opusFrame, 0, frameSize);
_client.Connection.UdpClient.Send(packet, packet.Length);
_nextTick += OpusConverter.TimeBetweenFrames;
_sequence++;
_timestamp += OpusConverter.FrameSamplesPerChannel;
}
return(offset + OpusConverter.FrameBytes);
}
protected override void HandlePacket(RTPPacketHeader header, byte[] payload)
{
// for some reason discord sends us voice packets before we get the user's ID. i don't think this impacts the audio tho; it seems like these packets don't have any voice data
if (header.Type == SupportedCodecs["opus"].PayloadType && _ssrcToUserDictionary.TryGetValue(header.SSRC, out ulong userId))
{
if (!_receivers.TryGetValue(userId, out IncomingVoiceStream receiver))
{
receiver = _receivers[userId] = new IncomingVoiceStream(this, userId);
if (OnUserSpeaking != null)
{
Task.Run(() => OnUserSpeaking.Invoke(this, _receivers[userId]));
}
}
if (payload.SequenceEqual(SilenceFrame))
{
receiver.SilenceFramesReceived++;
if (receiver.SilenceFramesReceived >= 10)
{
receiver.Close();
_receivers.Remove(receiver.UserId);
}
}
else
{
try
{
byte[] decoded = new byte[OpusEncoder.FrameBytes];
int length = _decoder.DecodeFrame(payload, 0, payload.Length, decoded, 0, false);
receiver.Enqueue(new DiscordVoicePacket(decoded));
}
catch (OpusException) { }
}
}
}
public MediaPacketEventArgs(RTPPacketHeader header, byte[] payload)
{
Header = header;
Payload = payload;
}
protected virtual void HandlePacket(RTPPacketHeader header, byte[] payload)
{
}