点对点视频会议程序VideoNet开发例解

　　该程序可以用于两个人在LAN/Intranet(或者Internet)上进行视频会议。现在有许多视频会议程序，每个都有各自的性能提升技术。主要的问题是视频会议视频帧的尺寸对于传输来说太大。因此，性能依赖于对帧的编解码。我使用快速h263编码库来达到更好的压缩率提高速度。该程序做些小改动也可以在Internet上使用。

音频的录制与播放

　　我在以前的语音会议程序中使用了RecordSound和PlaySound类，这里我将提供摘要说明RecordSound和PlaySound类的使用。

// Create and Start Recorder Thread
   record=new RecordSound(this);
   record->CreateThread();

// Create and Start Player Thread
   play=new PlaySound1(this);
   play->CreateThread();

// Start Recording
   record->PostThreadMessage(WM_RECORDSOUND_STARTRECORDING,0,0);

// Start Playing
   play->PostThreadMessage(WM_PLAYSOUND_STARTPLAYING,0,0);

// During audio recording, data will be available in the OnSoundData
// callback function of the RecordSound class. Here, you can place
// your code to send the data to remote host...

// To play the data received from the remote host
   play->PostThreadMessage(WM_PLAYSOUND_PLAYBLOCK,size,(LPARAM)data);

// Stop Recording
   record->PostThreadMessage(WM_RECORDSOUND_STOPRECORDING,0,0);

// Stop Playing
   play->PostThreadMessage(WM_PLAYSOUND_STOPPLAYING,0,0);

// At last, to Stop the Recording Thread
   record->PostThreadMessage(WM_RECORDSOUND_ENDTHREAD,0,0);

// To stop playing thread...
   play->PostThreadMessage(WM_PLAYSOUND_ENDTHREAD,0,0);

视频捕获