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8/14/2019 Your Way Create Your Voice Chat Systems - FADI Abdel-Qader

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Voice ChatBy Using Microsoft Visual C#

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FADI Abdel-qader Dot Net Networks & TCP/IP Programming

Chapter 11Voice Over IP Programming

A.The Concept & Requirements of VoiceCommunication Systems

B.How to Create a Voice Chat Throw DotNet Using Unmanaged APIs Functions

C.Testing UDP Multicasting, TCP andThinking in SCTP to Transfer Voice ThrowNetworks

D. How to Create a Voice ConferenceSystem Using Microsoft Direct Play 9

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:

IP BitsByte Array Datagram

PacketsPacketsByte Array FIFO First In First

Out...

MicrosoftTransport Layer Dot Net

Windows XP UDPTCP Windows XP

...

:of Voice Communication SystemsRequirementsThe

TCP UDP...

:Stream-1Delivered on Sequence2Voice Compression3

31 KB\S.8.000 KHz

- TCP UDP

:TCP TCP

Conference SystemMulticastMulticastingBroadcasting TCPUDP TCP Oriented

ProtocolMulticast ConferenceSystemBroadcasting..

UDP.

:UDP Delivered on Sequence Fragmented PacketsEthernet Encapsulation

1500KB Packet DatagramEncapsulation EthernetFragmented

Fragments

UDP ITU-International Telecommunications UnionH.323

RTP RealIETF Internet Engineering Task Force

Time Transport Protocol UDP StreamTCP UDP

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IPStreamDelivered on Sequence

MulticastingBroadcasting SCTPStream Control Transmission ProtocolWindows

LinuxMicrosoft Windows

.

::The Concept Of Voice Communication

BitsSampling

:

1- Application LayerBits Audio Compression Teachings

.

2- Transport Layer UDP TCP

Stream UDPStream

Delivered on Sequence Fragmentation Buffer Fragments

Ethernet Packet 1500 KB Packet

UDPStreamH.323

Stream TCP IP Multicasting

Broadcasting

3- Network Layer Packets UDPMulticastingBroadcasting

4- Data Link Layer Ethernet Ethernet

Frame 1500 KB

5- Physical Layer Delay Bits

.

Bits Physical Layer Data LinkLayer Network Layer Packets

Unicast

Multicast Broadcast Packets

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Packets Acknowledgment Packets

Transport Layer

TCP UDP

Packets

Packets.

PacketsEthernet Wireless LANIP MulticastingUDP:

:to Create a Voice Chat Throw Dot Net Using UnmanagedHow

APIs Functions:

DLL

winmm.dll Multimedia Methods

Byte Array Buffer Method:

waveInGetNumDevs

Sound Card.waveInAddBuffer BitsByte Array

Buffer Method :

waveInAddBuffer(IntPtr hwi, ref WaveHdr pwh, int cbwh)Reference

Buffer Buffer

waveInClosewaveInOpen.waveInPrepareHeader Buffer

.waveInAddBuffer

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waveInUnprepareHeader Buffer Buffer.waveInReset Pointer BufferwaveInStopwaveInStart

.

DllImport

:

[DllImport(winmm.dll)]publicstaticexternint waveInGetNumDevs();[DllImport(winmm.dll)]publicstaticexternint waveInAddBuffer(IntPtr hwi, refWaveHdr pwh, intcbwh);[DllImport(winmm.dll)]publicstaticexternint waveInClose(IntPtr hwi);[DllImport(winmm.dll)]publicstaticexternint waveInOpen(out IntPtr phwi, int uDeviceID,WaveFormat lpFormat, WaveDelegate dwCallback, int dwInstance, intdwFlags);[DllImport(winmm.dll)]publicstaticexternint waveInPrepareHeader(IntPtr hWaveIn, refWaveHdrlpWaveInHdr, int uSize);[DllImport(winmm.dll)]publicstaticexternint waveInUnprepareHeader(IntPtr hWaveIn, refWaveHdrlpWaveInHdr, int uSize);[DllImport(winmm.dll)]publicstaticexternint waveInReset(IntPtr hwi);

[DllImport(winmm.dll)]publicstaticexternint waveInStart(IntPtr hwi);[DllImport(winmm.dll)]publicstaticexternint waveInStop(IntPtr hwi);

Methods Byte Array Buffer:

[DllImport(winmm.dll)]publicstaticexternint waveOutGetNumDevs();

[DllImport(winmm.dll)]publicstaticexternint waveOutPrepareHeader(IntPtr hWaveOut, refWaveHdrlpWaveOutHdr, int uSize);[DllImport(winmm.dll)]publicstaticexternint waveOutUnprepareHeader(IntPtr hWaveOut, refWaveHdr lpWaveOutHdr, int uSize);[DllImport(winmm.dll)]publicstaticexternint waveOutWrite(IntPtr hWaveOut, refWaveHdrlpWaveOutHdr, int uSize);[DllImport(winmm.dll)]

publicstaticexternint waveOutOpen(out IntPtr hWaveOut, int uDeviceID,WaveFormat lpFormat, WaveDelegate dwCallback, int dwInstance, intdwFlags);

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[DllImport(winmm.dll)]publicstaticexternint waveOutReset(IntPtr hWaveOut);[DllImport(mmdll)]publicstaticexternint waveOutClose(IntPtr hWaveOut);[DllImport(mmdll)]publicstaticexternint waveOutPause(IntPtr hWaveOut);[DllImport(mmdll)]

publicstaticexternint waveOutRestart(IntPtr hWaveOut);[DllImport(mmdll)]publicstaticexternint waveOutGetPosition(IntPtr hWaveOut, outint lpInfo,int uSize);[DllImport(mmdll)]publicstaticexternint waveOutSetVolume(IntPtr hWaveOut, int dwVolume);[DllImport(mmdll)]publicstaticexternint waveOutGetVolume(IntPtr hWaveOut, outintdwVolume);

Buffer:

using System;using System.Runtime.InteropServices;using System.Resources;using System.IO;

publicclass Winmm{

publicconst UInt32 SND_ASYNC = 1;publicconst UInt32 SND_MEMORY = 4;

[DllImport("Winmm.dll")]publicstaticexternbool PlaySound(byte[] data, IntPtr hMod,

UInt32 dwFlags);public Winmm(){}

publicstaticvoid PlayWavResource(byte[] buffer){

PlaySound(buffer, IntPtr.Zero, SND_ASYNC | SND_MEMORY);}

}

PlaySound Method Byte BufferMethod Socket :

void Voice_Receiver(){

UdpClient sock = new UdpClient(5020);sock.JoinMulticastGroup(IPAddress.Parse(multicast_IP.Text));IPEndPoint iep = new IPEndPoint(IPAddress.Any, 0);byte[] voice_Come = sock.Receive(refiep);

Winmm.PlayWavResource(voice_Come);sock.Close();}

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:Voice Chat System

Buffer Classes MicrosoftWindows Sound Recorder Classes

Voice Library Classes Classes :

WaveIn Class MethodsByte Array

WaveOut Clasas BufferWaveStream ClassStreamMemoryStream

FifoStream StreamWaveNative Methods

winmm.dl .

UDPFull Diplex Unicast Voice Chat System

:

:

ClassesVoice.dll References

Using :

using System.Net;

using System.Net.Sockets;using System.Threading;using Voice;

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//for Recorderif(m_RecBuffer == null || m_RecBuffer.Length < size)m_RecBuffer = newbyte[size];System.Runtime.InteropServices.Marshal.Copy(data, m_RecBuffer, 0, size);

//Microphone ==> data ==> m_RecBuffer ==> m_Fifosocket.SendTo(m_RecBuffer, newIPEndPoint(IPAddress.Parse(Peer_IP.Text),5030));

} Full DuplexTow Ports

Port ...Port

:privatevoid Start(){

Stop();try{WaveFormat fmt = new WaveFormat(44100, 16, 2);m_Player = new WaveOutPlayer(-1, fmt, 16384, 3, newBufferFillEventHandler(Filler));m_Recorder = new WaveInRecorder(-1, fmt, 16384, 3, newBufferDoneEventHandler(Voice_Out));}catch{Stop();throw;

}}

:

privatevoid Stop(){if(m_Player != null)

try{m_Player.Dispose();

}finally{m_Player = null;}

if(m_Recorder != null)try{m_Recorder.Dispose();}finally{m_Recorder = null;

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}m_Fifo.Flush();// clear all pending data

} Voice BufferSocket:

privatevoid Filler(IntPtr data, int size){

if(m_PlayBuffer == null || m_PlayBuffer.Length < size)m_PlayBuffer = newbyte[size];if(m_Fifo.Length >= size)m_Fifo.Read(m_PlayBuffer, 0, size);elsefor (int i = 0; i < m_PlayBuffer.Length; i++)m_PlayBuffer[i] = 0;System.Runtime.InteropServices.Marshal.Copy(m_PlayBuffer, 0, data, size);

// m_Fifo ==> m_PlayBuffer==> data ==> Speakers}

:UDP and Thinking in SCTP to Transfer Voice Throw,Testing TCPNetworks:

Multicast Half Duplex Voice Chat System Multicasting

:

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)( IP Multicasting :

privatevoid Voice_Out(IntPtr data, int size)

{//for Recorderif(m_RecBuffer == null || m_RecBuffer.Length < size)

m_RecBuffer = newbyte[size];System.Runtime.InteropServices.Marshal.Copy(data, m_RecBuffer, 0, size);

//Microphone ==> data ==> m_RecBuffer ==> m_Fifosocket.SendTo(m_RecBuffer, new IPEndPoint(IPAddress.Parse("224.0.1.7"),5020));}

IP Multicast Group :

privatevoid Voice_In(){UdpClient sock = new UdpClient(5000);sock.JoinMulticastGroup(IPAddress.Parse("224.0.1.7"));IPEndPoint iep = new IPEndPoint(IPAddress.Any,0);

while (true){m_Fifo.Write(sock.Receive(refiep), 0,sock.Receive(refiep).Length);}

}

...

UDP Multicasting Packets

UDP ...

TCP Oriented Protocol

Stream

Fragmentation

...Delivered Out on Sequence Socket :

socket = new Socket(AddressFamily.InterNetwork, SocketType.Stream ,ProtocolType.Tcp);

Network Stream Class :

privatevoid Voice_Out(IntPtr data, int size){//for Recorder

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if(m_RecBuffer == null || m_RecBuffer.Length < size)m_RecBuffer = newbyte[size];System.Runtime.InteropServices.Marshal.Copy(data, m_RecBuffer, 0, size);

//Microphone ==> data ==> m_RecBuffer ==> m_Fifosock.Connect(new IPEndPoint(IPAddress.Parse("10.0.0.10"),5020));NetworkStream ns = new NetworkStream (socket);ns.Write (m_RecBuffer,0,m_RecBuffer.Length);

} Network Stream :

privatevoid Voice_In(){

Socket sock = new Socket(AddressFamily.InterNetwork,SocketType.Stream , ProtocolType.Tcp);sock.Bind(new IPEndPoint(IPAddress.Parse("10.0.0.10"),5020));NetworkStream ns = new NetworkStream (sock);while (true){byte[] buffer = newbyte [16384];ns.Read (buffer,0,16384);m_Fifo.Write(buffer, 0, buffer.Length); }

}

Multicasting Broadcasting... UDP

TCPLong HornMicrosoft SCTP...

TCP UDP Multicasting Fragmentation

Delivered on Sequence Header :

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:tHow to Create a Voice Conference System Using Microsof9Direct Play:

Direct Play9MicrosoftDirectPlay Transport Protocol DirectX

Network Games

NovelIPXTCP/IP DirectPlay Transport Protocol:

-Reliable delivery of messages-Sequential a delivery of messages-Send prioritization-Streaming SessionStream Data

Microsoft SCTP TCP UDP

Transport Layer Direct Play Classes :

: Connect Classes: Address , Guid , Peer ClassesDirectPlayHash Code

Guid Class Peer Class

Socket TCP/IP :

using Microsoft.DirectX.DirectPlay;

.

.

.Address hostAddress = new Address();hostAddress.ServiceProvider = Address.ServiceProviderTcpIp;

// Select TCP/IP service provider

ApplicationDescription dpApp = new ApplicationDescription();appGuid = Guid.NewGuid(); // Create a GUID for the applicationdpApp.GuidApplication = appGuid; // Set the application GUID

dpApp.SessionName = "My Session"; // Optional Session Name

myPeer.Host(dpApp, hostAddress); // Begin hosting

IPXTCP/IP IP Address :

using Microsoft.DirectX.DirectPlay;ServiceProviderInfo[] mySPInfo;Peer myPeer;

System.Windows.Forms.ListBox listBox1;ApplicationDescription myAppDesc;.

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.myPeer = new Peer();hostAddress = new Address();peerAddress = new Address();

// Set the service provider to TCP/IPpeerAddress.ServiceProvider = Address.ServiceProviderTcpIp;

hostAddress.ServiceProvider = Address.ServiceProviderTcpIp;

// Attach FindHostResponseEventHandler to receiveFindHostResponseMessagesmyPeer.FindHostResponse += newFindHostResponseEventHandler(myEnumeratedHosts);

// Call FindHosts to start the enumerationmyPeer.FindHosts(myAppDesc, hostAddress, peerAddress, null, 10, 0, 0,

FindHostsFlags.OkToQueryForAddressing);

TCP/IP FindHosts Method Peer Class

Connect Method Peer Class:

using Microsoft.DirectX.DirectPlay;// Structure for FindHostResponseMessagespublicstructHostInfo{

public ApplicationDescription appdesc;

public Address deviceAddress;public Address senderAddress;

}...Peer myPeer = new Peer();HostInfo hostinfo = new HostInfo();

// The FindHostResponseEventHandlerpublicvoid myEnumeratedHosts(object o, FindHostResponseEventArgs args){

hostinfo.appdesc = args.Message.ApplicationDescription;hostinfo.deviceAddress = args.Message.AddressDevice;hostinfo.senderAddress = args.Message.AddressSender;

}

// Attach the ConnectCompleteEventHandler to receiveConnectCompleteMessages

myPeer.ConnectComplete += newConnectCompleteEventHandler(OnConnectComplete);

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// Call connect passing the Host information returned in theFindHostResponse eventmyPeer.Connect(hostinfo.appdesc, hostinfo.deviceAddress,hostinfo.senderAddress, null, ConnectFlags.OkToQueryForAddressing);

:Voice.DirectPlay.tXDirec.Microsoft:

:

Classes

1- Classes Server Sessions:Server Class :

Server server = new Voice.Server(peerObject);

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Peer Object Peer Class Server Object Methods

:

StartSession Method SessionDescription:

//set up session description for the voice server

Voice.SessionDescription sessionDesc = new Voice.SessionDescription();sessionDesc.BufferAggressiveness = Voice.BufferAggressiveness.Default;sessionDesc.BufferQuality = Voice.BufferQuality.Default;sessionDesc.Flags = 0;sessionDesc.SessionType = type;sessionDesc.GuidCompressionType = compressionType;

Peer ObjectMethodVoice Session VoiceSession TypeCompression Type :

protectedvoid CreateVoiceSession(Peer dpp, Voice.SessionType type, GuidcompressionType)

{try

{//set up session description for the voice serverVoice.SessionDescription sessionDesc = new Voice.SessionDescription();sessionDesc.BufferAggressiveness = Voice.BufferAggressiveness.Default;sessionDesc.BufferQuality = Voice.BufferQuality.Default;sessionDesc.Flags = 0;sessionDesc.SessionType = type;

sessionDesc.GuidCompressionType = compressionType;

//start the sessiontry

{server.StartSession(sessionDesc);mIsHost = true;mInSession = true;

}catch(DirectXException dxe)

{throw dxe;

}

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int[] xmitTargets = newint[1];xmitTargets[0] = (int) PlayerID.AllPlayers;client.TransmitTargets = xmitTargets;

//get sound device config to check for half-duplexsoundConfig = client.SoundDeviceConfig;mHalfDuplex = ((soundConfig.Flags & Voice.SoundConfigFlags.HalfDuplex)

!= 0);

}catch(Exception e){throw e;}

}}

TCP UDP DirectPlay Direct Play

Direct Play Voice Over IP SCTP

Linux...

Voice ChatTransport Layer

ClassesDirectPlay Transport Protocol.

TCP/IP:

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