protected void StartPlayback()
{
HResult hr = m_pSession.Start(Guid.Empty, new PropVariant());
if (hr == HResult.S_OK)
{
mPlayPauseBtn.IsEnabled = true;
mImageBtn.Source = new BitmapImage(new Uri("pack://application:,,,/WPFMediaFoundationPlayer;component/Images/pause.png", UriKind.Absolute));
mIsPlaying = true;
mPresentationClock = null;
m_pSession.GetClock(out mPresentationClock);
mTickTimer.Start();
mIsSeek = false;
}
MFError.ThrowExceptionForHR(hr);
//m_pSession.
}
//////////////////////////////////////////////////////////////////////////
// Name: CPlayer::Initialize
// Description:
// Intializes Media Foundation
// Creates a media session
// Creates a sequencer source
// Creates a presentation clock
// Creates an audio renderer
// Starts the event queue
//
/////////////////////////////////////////////////////////////////////////
public HResult Initialize()
{
Debug.WriteLine("\nCPlayer::Initialize");
HResult hr = 0;
try
{
IMFClock pClock;
// Initialize Media Foundation.
hr = MFExtern.MFStartup(0x10070, MFStartup.Full);
MFError.ThrowExceptionForHR(hr);
// Create the media session.
hr = MFExtern.MFCreateMediaSession(null, out m_pMediaSession);
MFError.ThrowExceptionForHR(hr);
// Start the event queue.
hr = m_pMediaSession.BeginGetEvent(this, null);
MFError.ThrowExceptionForHR(hr);
// Create a sequencer Source.
hr = MFExtern.MFCreateSequencerSource(null, out m_pSequencerSource);
MFError.ThrowExceptionForHR(hr);
//setup clock
hr = m_pMediaSession.GetClock(out pClock);
MFError.ThrowExceptionForHR(hr);
m_pPresentationClock = (IMFPresentationClock)pClock;
// Create an IMFActivate object for the audio renderer.
hr = MFExtern.MFCreateAudioRendererActivate(out m_pAudioRendererActivate);
MFError.ThrowExceptionForHR(hr);
//Set the player state to Initialized
m_State = PlayerState.Initialized;
// Notify the app that the player is initialized.
PostMessage(m_hWnd, Form1.WM_NOTIFY_APP, new IntPtr((int)PlayerEvent.Initialized), new IntPtr((int)m_State));
}
catch (Exception e)
{
hr = (HResult)Marshal.GetHRForException(e);
}
//Clean up.
return(hr);
}
/// <summary>
/// Processes the media session event.
/// </summary>
private void ProcessEvent()
{
while (m_Session != null)
{
try {
m_Session.GetEvent(1, out IMFMediaEvent _event);//requests events and returns immediately
_event.GetType(out MediaEventType eventtype);
switch (eventtype)
{
case MediaEventType.MESessionEnded:
PlaybackState = PlaybackState.Stopped;
PlaybackStopped?.Invoke(this, new StoppedEventArgs());
break;
case MediaEventType.MESessionTopologyStatus: //topology loaded
Guid guidManager = typeof(IAudioSessionManager).GUID;
(new MMDeviceEnumeratorComObject() as IMMDeviceEnumerator).
GetDefaultAudioEndpoint(CoreAudioApi.DataFlow.Render, CoreAudioApi.Role.Multimedia, out IMMDevice endoint);
endoint.Activate(ref guidManager, ClsCtx.ALL, IntPtr.Zero, out object _manager);
IAudioSessionManager manager = _manager as IAudioSessionManager;
manager.GetSimpleAudioVolume(Guid.Empty, 0, out m_volume);
m_Session.GetClock(out m_clock);
Guid guid_ratecontrol = typeof(IMFRateControl).GUID;
Guid MF_RATE_CONTROL_SERVICE = Guid.Parse("866fa297-b802-4bf8-9dc9-5e3b6a9f53c9");
MediaFoundationInterop.MFGetService(m_Session, ref MF_RATE_CONTROL_SERVICE, ref guid_ratecontrol, out object _control); //gets rate control
m_rate = _control as IMFRateControl;
Prepared = true;
break;
}
_event = null;
}
catch (COMException e)
{
if (e.HResult == MediaFoundationErrors.MF_E_NO_EVENTS_AVAILABLE)
{
continue;
}
else
{
throw e;
}
}
catch (ThreadAbortException)
{
break;
}
}
}
