如何使用Nancy编写MJPEG服务器
本文关键字:MJPEG 服务器 编写 Nancy 何使用 | 更新日期: 2023-09-27 18:24:07
我有以下内容:
public sealed class ServerModule : NancyModule
{
public ServerModule()
{
Get["/video"] = o =>
{
byte[] img = GetImage("whatever.jpeg");
return new MjpegResponse(firstImg);
};
}
private sealed class MjpegResponse : Response
{
public MjpegResponse(byte[] data)
{
this.Headers.Clear();
this.Headers.Add("Server", "IP Webcam Server 1.5");
this.Headers.Add("Connection", "close");
this.Headers.Add("Cache-Control", "no-store, no-cache, must-revalidate, pre-check=0, post-check=0, max-age=0");
this.Headers.Add("Pragma", "no-cache");
this.Headers.Add("Expires", "-1");
this.Headers.Add("Access-Control-Allow-Origin", "*");
this.ContentType = "multipart/x-mixed-replace;boundary=Ba4oTvQMY8ew04N8dcnM";
var footer = Encoding.ASCII.GetBytes("'r'n");
this.Contents = stream =>
{
using(var writer = new BinaryWriter(stream))
{
writer.Write(data);
writer.Write(footer);
}
};
}
}
}
标题与我从一个内置MJPEG服务器的IPCamera获得的标题相匹配,尽管Fiddler显示了正确的标题:
HTTP/1.1 200 OK
Cache-Control: no-store, no-cache, must-revalidate, pre-check=0, post-check=0, max-age=0
Pragma: no-cache
Transfer-Encoding: chunked
Content-Type: multipart/x-mixed-replace;boundary=Ba4oTvQMY8ew04N8dcnM
Expires: -1
Server: IP Webcam Server 1.5 Microsoft-HTTPAPI/2.0
Access-Control-Allow-Origin: *
Date: Tue, 24 Nov 2015 21:23:29 GMT
Connection: close
在启用MJPEG的浏览器(Firefox)中尝试时,无法流式传输或显示任何内容。我注意到的另一件事是Transfer-Encoding: chunked
,它不应该出现。
有什么想法吗?
我认为这里的问题很容易解决。写入流后,它指向流的末尾。在返回响应之前,您需要将指针倒带到流的开头:
stream.Seek(0, SeekOrigin.Begin);