html5 Ajax 访问.net WebApi获取视频流

http://localhost//api/Test/GetVideo?filename=/GoodVideo/e36a144b-52cd-4174-93d2-cfc41aea6c1d.mp4 是API地址加上视频路径，此地址一般是动态获取

<video id="video" style="width:100%;" controls="controls" preload="preload" onerror="videoError(this)">
<source src="http://localhost//api/Test/GetVideo?filename=/GoodVideo/e36a144b-52cd-4174-93d2-cfc41aea6c1d.mp4" type="video/mp4">
</video>

src直接写入api地址，filename是对应服务器视频存储的地址。

后台对应代码

 //视频接口
        public HttpResponseMessage GetVideo(string filename)
        {
            var video = new VideoStream(filename);
            Action<Stream, HttpContent, TransportContext> send = video.WriteToStream;
            var response = Request.CreateResponse();
            response.Content = new System.Net.Http.PushStreamContent(send, new System.Net.Http.Headers.MediaTypeHeaderValue("video/mp4"));
            //调用异步数据推送接口
            return response;
        }  

VideoStream 帮助类代码如下

  public class VideoStream
    {
        private readonly string _filename;

        public VideoStream(string filename)
        {
            _filename = HttpContext.Current.Server.MapPath("~" + filename); ;
        }
        public async void WriteToStream(Stream outputStream, HttpContent content, TransportContext context)
        {
            try
            {
                var buffer = new byte[];

                using (var video = File.Open(_filename, FileMode.Open, FileAccess.Read, FileShare.ReadWrite))
                {
                    var length = (int)video.Length;
                    var bytesRead = ;

                    while (length >  && bytesRead > )
                    {
                        bytesRead = video.Read(buffer, , Math.Min(length, buffer.Length));
                        await outputStream.WriteAsync(buffer, , bytesRead);
                        length -= bytesRead;
                    }
                }
            }
            catch (HttpException ex)
            {
                return;
            }
            finally
            {
                outputStream.Close();
            }
        }
    }