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POWhy is the MediaElement not playing a MediaStreamSource (in SilverLight)?
 

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  1. POWhy is the MediaElement not playing a MediaStreamSource (in SilverLight)?
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    <p>When I try to stream sound from my microphone, I need to get it through a <code>MediaStreamSource</code>. Therefore I first need to implement a <code>MediaStreamSource</code> for the pcm waveformat I get from my Microphone. There are at least two methods I think I need to implement. At first</p> <pre><code>protected override void OpenMediaAsync() { // Create description Dictionary&lt;MediaStreamAttributeKeys, string&gt; streamAttributes = new Dictionary&lt;MediaStreamAttributeKeys, string&gt;(); streamAttributes[MediaStreamAttributeKeys.CodecPrivateData] = output.CodecPrivateData; audioDesc = new MediaStreamDescription(MediaStreamType.Audio, streamAttributes); // register stream Dictionary&lt;MediaSourceAttributesKeys, string&gt; sourceAttributes = new Dictionary&lt;MediaSourceAttributesKeys, string&gt;(); List&lt;MediaStreamDescription&gt; availableStreams = new List&lt;MediaStreamDescription&gt;(); availableStreams.Add(audioDesc); sourceAttributes[MediaSourceAttributesKeys.Duration] = TimeSpan.FromMinutes(0).Ticks.ToString(); // whatever I put here I get the same result. sourceAttributes[MediaSourceAttributesKeys.CanSeek] = false.ToString(); ReportOpenMediaCompleted(sourceAttributes, availableStreams); } </code></pre> <p>This works very well. My CodecPrivateData is '01000100401F0000803E0000020010000000' (PCM 1ch 16Bits 8kHz). This method gets called by setting the source as here:</p> <pre><code>WaveMediaStreamSource WaveStream = new WaveMediaStreamSource(output); mediaElement.SetSource(WaveStream); mediaElement.Play(); </code></pre> <p>After <code>Play()</code> absoultely nothing happens. I would suggest the mediaElement should call at least once the method <code>GetSampleAsync()</code> of the <code>MediaStreamSource</code>. But it doesn't. I've noticed that the <code>MediaElement</code> doesn't make any call to the <code>MediaStreamSource</code> anymore.</p> <p>While <code>OpenMediaAsync</code> the <code>mediaElement.CurrentState</code> is <code>Opening</code>. After that it turns to <code>Playing</code> but it doesn't play. And then it do not change anymore and remains <code>Playing</code>.</p> <p>Any Ideas?</p>
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    1. USChristoph Meißner
    1. USChristoph Meißner
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      1. POWhy is the MediaElement not playing a MediaStreamSource (in SilverLight)?
      1. USXaenec Levre
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    1. COI have also looked at [this example](http://silverlightvideochat.codeplex.com/releases/view/43242). It is implemented very similar, and for this part above nearly the same. (except the duration part) The only thing that is different, that it seems to switch the `MediaStreamSource` every few milliseconds. But this should not influence that `GetSampleAsync()` is never called. The rest I've traced produces exact the same data.
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      1. POWhy is the MediaElement not playing a MediaStreamSource (in SilverLight)?
      1. USChristoph Meißner
    2. COFor this example I am also able to reproduce this behaviour, when I only assign one `MediaStreamSource` and block all following, it also never touches the `GetSampleAsync()`-Method of the stream. This smells like buffering or something like that, 'until' a specific count of `MediaStreamSource`-objects have been assigned. But this makes absolutely no sense to me - or I don't understand it. Anyone an idea?
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      1. POWhy is the MediaElement not playing a MediaStreamSource (in SilverLight)?
      1. USChristoph Meißner
 

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