Stream a WAV File From The Web In Silverlight 3

Question

I've managed to discover Gilles Khouzam's playback implementation for WAV files in Silverlight 3 and while that would be the majority of the battle, I'm stuck on a final detail: how do I pull a wav file from the web some place and then feed it into his WaveMediaStreamSource for playback?

Here's the closest I've come:

    public MainControl()
 {
  // Required to initialize variables
  InitializeComponent();
     PlayButton.Click += PlayButtonClicked;
 }

    private void PlayButtonClicked(object sender, RoutedEventArgs e)
    {
        HttpWebRequest request = (HttpWebRequest) WebRequest.Create(@"soundfile.wav");
        request.BeginGetResponse(ReadCallback, request); 
    }

    private void ReadCallback(IAsyncResult asynchronousResult)
    {
        HttpWebRequest request = (HttpWebRequest)asynchronousResult.AsyncState;
        HttpWebResponse response = (HttpWebResponse)request.EndGetResponse(asynchronousResult);

        WaveMediaStreamSource wavMss = new WaveMediaStreamSource(response.GetResponseStream());
        MediaPlayer.SetSource(wavMss);
    }

Edit: It turns out the problem had to do with HttpWebRequest. Changing the code to:

        public MainPage()
    {
        InitializeComponent();
        WebClient webClient = new WebClient();
        webClient.OpenReadCompleted += new OpenReadCompletedEventHandler(webClient_OpenReadCompleted);
        webClient.OpenReadAsync(new Uri(@"http://www.russellmyers.com/somefile.wav", UriKind.Absolute));
    }

    void webClient_OpenReadCompleted(object sender, OpenReadCompletedEventArgs e)
    {


        WaveMediaStreamSource wavMss = new WaveMediaStreamSource(e.Result);
        Debug.WriteLine("Setting source...");
        Media.SetSource(wavMss);
    }

Works fine. This makes sense too after reading Shawn Wildermuth's article on the differences. I would like to get HttpWebRequest working though because it won't be done on the UI thread.

Answer 1

Are you getting any exception in the MediaStreamSource? Is the data in PCM format for the wave file? Have you tried to see if OpenMediaAsync and GetSampleAsync get called on the MediaStreamSource?