DxPackNet 5.视频高质量的压缩和传输

DxPackNet 对视频的压缩和解压也提供了很好的支持，且系统不需要装第三方解码器哦~

主要用到了 IxVideoEncoder 视频编码器 和 IxVideoDecoder 两个接口

这里只做简单的组件功能使用介绍，实际应用中可能涉及到 UDP分包，包顺序控制，

音视频传输协议制定， P2P，这就不在本文的讨论范围

private void Form1_Load(object sender, EventArgs e)
{

server = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);
server.Bind(new IPEndPoint(IPAddress.Parse("127.0.0.1"), 38000));//绑定端口号
threadRecv = new Thread(new ThreadStart(ReviceMsg));
threadRecv.Start();

client = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);
svpoint = new IPEndPoint(IPAddress.Parse("127.0.0.1"), 38000);

//初始化视频编码环境
IxVideoCoderEnv Env = DxFactory.CreateDxCompent<IxVideoCoderEnv>();
Env.Init();
//创建编码器
encoder = DxFactory.CreateDxCompent<IxVideoEncoder>();
encoder.Quant = 30;//视频质量 0~31 之间的数字 越小画质越好， 越大越流畅
//创建解码器
decoder = DxFactory.CreateDxCompent<IxVideoDecoder>();

cameras = DxFactory.CreateDxCompent<DxDeviceCollection>(DxDeviceCollection.ENVIRONMENT_CAMERAS);
camCapture = DxFactory.CreateDxCompent<IDxCameraCapture>(this, panel1);
camCapture.FrameCb = camerasFrameCb;
camCapture.Init(cameras[0]);

}
byte[] outBuffer = new byte[1024 * 1024 * 2];//2M
byte[] imgBuffer = new byte[1024 * 1024 * 2];//2M
private void camerasFrameCb(byte[] buffer, int size)
{
Array.Clear(outBuffer, 0, outBuffer.Length);
//压缩视频流
int outSz = encoder.Encode(buffer, size, outBuffer);
client.SendTo(outBuffer,outSz,SocketFlags.None,svpoint);//客户端发送压缩后的视频流
}
private void ReviceMsg() //服务端接收视频流后解压显示
{
byte[] bufferRecv=new byte[1024 * 1024 * 2];////2M
while (!bExit)
{
if (server.Poll(0, SelectMode.SelectRead))
{
EndPoint clpoint1 = new IPEndPoint(IPAddress.Parse("127.0.0.1"), 38000);
//接收压缩流
int revLen = server.ReceiveFrom(bufferRecv, SocketFlags.None, ref clpoint1);
reviceSize += revLen;
Array.Clear(imgBuffer, 0, imgBuffer.Length);
//解压缩视频流
int outSz = decoder.Decode(bufferRecv, revLen, imgBuffer);
this.BeginInvoke(new camerasFrameCbHandler(_camerasFrameCb), imgBuffer, 640 * 480 * 3);
}
}
}

delegate void camerasFrameCbHandler(byte[] buffer, int size);
public void _camerasFrameCb(byte[] buffer, int size)
{
//将视频流转换为帧图片
Bitmap bmp = camCapture.BmpFromBuffer(buffer, size);
if (bmp != null)
{
Image oimg = pictureBox1.Image;
pictureBox1.Image = bmp;
if (oimg != null) oimg.Dispose();
}
}

效果图:



最后附上demo VideoTransferDemo.zip