How to playback H.264 raw stream using MediaStreamSource in WindowsPhone

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C#

WinMobile

Help! I'm trying to playback H.264 raw stream using MediaStreamSource in the WindowsPhone emulator.My 264 stream file is encoded by JM10.1 encoder on level 3.0 baseline profile.But now the emulator can only display the first frame of the stream. How can I get the other frames rendered and displayed?
Here are my GetSampleAsync function codes.I guess something is wrong in this functon.But I can't find it out.

protected override void GetSampleAsync(MediaStreamType mediaStreamType)
                {
                    MediaStreamDescription mediaStreamDescription = new MediaStreamDescription(MediaStreamType.Video, mediaStreamAttributes);
                    Dictionary<MediaSampleAttributeKeys, string> mediaSampleAttributes = new Dictionary<MediaSampleAttributeKeys, string>();
                   
                    MediaStreamSample mediaStreamSample = new MediaStreamSample(mediaStreamDescription, mediaStream, 0, mediaStream.Length, 0, mediaSampleAttributes);
                    this.ReportGetSampleCompleted(mediaStreamSample);
                }