private void GetInterface()
{
IMFMediaSession ms;
int hr = MFExtern.MFCreateMediaSession(null, out ms);
MFError.ThrowExceptionForHR(hr);
m_rc = ms as IMFRateControl;
}
/// <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;
}
}
}
private void GetRateControl()
{
if (RateControl != null)
{
return;
}
if (m_pSession == null)
{
return;
}
object RC = null;
MFExtern.MFGetService(m_pSession, MFServices.MF_RATE_CONTROL_SERVICE, typeof(IMFRateControl).GUID, out RC);
RateControl = RC as IMFRateControl;
if (RateControl == null)
{
throw new Exception("Couldnt get the rate control interface");
}
}
public int InitializeMedia(string MediaFile, int dwrate, float dwvolume, bool IsFullScreen)
{
int hr;
MFStartup(MF_VERSION, MFSTARTUP_FULL);
MFCreateMediaSession(IntPtr.Zero, out mediaSession);
MFCreateTopology(out IMFTopology topo);
MFCreateSourceResolver(out IMFSourceResolver resolver);
IUnknown unknown;
try
{
resolver.CreateObjectFromURL(MediaFile, MF_RESOLUTION_MEDIASOURCE | MF_RESOLUTION_CONTENT_DOES_NOT_HAVE_TO_MATCH_EXTENSION_OR_MIME_TYPE,
null, out uint objtype, out unknown);
}
catch
{
MessageBox.Show("不支持的媒体格式。", "错误", MessageBoxButtons.OK, MessageBoxIcon.Error);
return(0);
}
IMFMediaSource source = unknown as IMFMediaSource;
source.CreatePresentationDescriptor(out IMFPresentationDescriptor descriptor);
if (MFRequireProtectedEnvironment(descriptor) == 0)
{
MessageBox.Show("媒体受保护,无法播放。", "错误", MessageBoxButtons.OK, MessageBoxIcon.Error);
return(0);
}
descriptor.GetStreamDescriptorCount(out uint sdcount);
for (uint i = 0; i < sdcount; i++)
{
descriptor.GetStreamDescriptorByIndex(i, out bool IsSelected, out IMFStreamDescriptor sd);
if (!IsSelected)
{
descriptor.SelectStream(i);
}
sd.GetMediaTypeHandler(out IMFMediaTypeHandler typeHandler);
typeHandler.GetMajorType(out Guid streamtype);
IMFActivate renderer;
if (streamtype == MFMediaType_Audio)
{
hr = MFCreateAudioRendererActivate(out renderer);
}
else if (streamtype == MFMediaType_Video)
{
hr = MFCreateVideoRendererActivate(VideoWnd.Handle, out renderer);
HasVideo = true;
}
else
{
MessageBox.Show("不支持的媒体格式。", "错误", MessageBoxButtons.OK, MessageBoxIcon.Error);
return(0);
}
hr = MFCreateTopologyNode(MF_TOPOLOGY_SOURCESTREAM_NODE, out IMFTopologyNode sourcenode);
sourcenode.SetUnknown(MF_TOPONODE_SOURCE, source as IUnknown);
sourcenode.SetUnknown(MF_TOPONODE_PRESENTATION_DESCRIPTOR, descriptor as IUnknown);
sourcenode.SetUnknown(MF_TOPONODE_STREAM_DESCRIPTOR, sd as IUnknown);
topo.AddNode(sourcenode);
MFCreateTopologyNode(MF_TOPOLOGY_OUTPUT_NODE, out IMFTopologyNode outputnode);
outputnode.SetObject(renderer as IUnknown);
topo.AddNode(outputnode);
outputnode.SetUINT32(MF_TOPONODE_NOSHUTDOWN_ON_REMOVE, 0);
hr = sourcenode.ConnectOutput(0, outputnode, 0);
}
mediaSession.SetTopology(0, topo);
Rate = dwrate;
Volume = dwvolume;
this.IsFullScreen = IsFullScreen;
uint eventtype = 0;
while (eventtype != MESessionTopologyStatus)
{
mediaSession.GetEvent(0, out IMFMediaEvent mediaevent);
mediaevent.GetType(out eventtype);
mediaevent = null;
}
Guid guid_ratecontrol = typeof(IMFRateControl).GUID;
MFGetService(mediaSession as IUnknown, ref MF_RATE_CONTROL_SERVICE, ref guid_ratecontrol, out IUnknown _ratecontrol);
IMFRateControl ratecontrol = _ratecontrol as IMFRateControl;
hr = ratecontrol.SetRate(false, Rate >= 0 ? Rate * 7 / 10 + 1 : 1 / (1 + Rate / -10 * 7));
try
{
Guid guid_volume = typeof(IMFStreamAudioVolume).GUID;
Guid guid_audiopolicy = typeof(IMFAudioPolicy).GUID;
hr = MFGetService(mediaSession as IUnknown, ref MR_STREAM_VOLUME_SERVICE, ref guid_volume, out IUnknown _volume);
hr = MFGetService(mediaSession as IUnknown, ref MR_AUDIO_POLICY_SERVICE, ref guid_audiopolicy, out IUnknown _policy);
IMFStreamAudioVolume volumecontrol = _volume as IMFStreamAudioVolume;
IMFAudioPolicy policy = _policy as IMFAudioPolicy;
volumecontrol.GetChannelCount(out uint channelcount);
for (uint c = 0; c < channelcount; c++)
{
volumecontrol.SetChannelVolume(c, Volume);
}
policy.SetDisplayName(" ");
}
catch
{
}
try
{
Guid guid_videocontrol = typeof(IMFVideoDisplayControl).GUID;
hr = MFGetService(mediaSession as IUnknown, ref MR_VIDEO_RENDER_SERVICE, ref guid_videocontrol, out IUnknown _videocontrol);
IMFVideoDisplayControl videocontrol = _videocontrol as IMFVideoDisplayControl;
VideoWnd.videocontrol = videocontrol;
if (IsFullScreen)
{
VideoWnd.Top = 0;
VideoWnd.Left = 0;
VideoWnd.Width = (int)System.Windows.SystemParameters.PrimaryScreenWidth;
VideoWnd.Height = (int)System.Windows.SystemParameters.PrimaryScreenHeight;
}
Rectangle videopos = new Rectangle(0, 0, VideoWnd.Width, VideoWnd.Height);
videocontrol.SetVideoPosition(null, ref videopos);
}
catch
{
}
hr = mediaSession.BeginGetEvent((IMFAsyncCallback)this, null);
return(1);
}
public void InitializeMedia(string MediaFile, int dwrate, float dwvolume)
{
int hr;
MFStartup(MF_VERSION, MFSTARTUP_FULL);
MFCreateMediaSession(IntPtr.Zero, out IMFMediaSession mediaSession);
MFCreateTopology(out IMFTopology topo);
MFCreateSourceResolver(out IMFSourceResolver resolver);
IUnknown unknown;
try
{
resolver.CreateObjectFromURL(MediaFile, MF_RESOLUTION_MEDIASOURCE | MF_RESOLUTION_CONTENT_DOES_NOT_HAVE_TO_MATCH_EXTENSION_OR_MIME_TYPE,
null, out uint objtype, out unknown);
}
catch
{
MessageBox.Show("不支持的媒体格式。", "错误", MessageBoxButtons.OK, MessageBoxIcon.Error);
return;
}
IMFMediaSource source = unknown as IMFMediaSource;
source.CreatePresentationDescriptor(out IMFPresentationDescriptor descriptor);
if (MFRequireProtectedEnvironment(descriptor) == 0)
{
MessageBox.Show("媒体受保护,无法播放。", "错误", MessageBoxButtons.OK, MessageBoxIcon.Error);
return;
}
descriptor.GetStreamDescriptorCount(out uint sdcount);
for (uint i = 0; i < sdcount; i++)
{
descriptor.GetStreamDescriptorByIndex(i, out bool IsSelected, out IMFStreamDescriptor sd);
if (!IsSelected)
{
descriptor.SelectStream(i);
}
sd.GetMediaTypeHandler(out IMFMediaTypeHandler typeHandler);
typeHandler.GetMajorType(out Guid streamtype);
IMFActivate renderer;
if (streamtype == MFMediaType_Audio)
{
hr = MFCreateAudioRendererActivate(out renderer);
}
else if (streamtype == MFMediaType_Video)
{
hr = MFCreateVideoRendererActivate(host.Handle, out renderer);
hasvideo = true;
}
else
{
continue;
}
hr = MFCreateTopologyNode(MF_TOPOLOGY_SOURCESTREAM_NODE, out IMFTopologyNode sourcenode);
sourcenode.SetUnknown(MF_TOPONODE_SOURCE, source as IUnknown);
sourcenode.SetUnknown(MF_TOPONODE_PRESENTATION_DESCRIPTOR, descriptor as IUnknown);
sourcenode.SetUnknown(MF_TOPONODE_STREAM_DESCRIPTOR, sd as IUnknown);
topo.AddNode(sourcenode);
MFCreateTopologyNode(MF_TOPOLOGY_OUTPUT_NODE, out IMFTopologyNode outputnode);
outputnode.SetObject(renderer as IUnknown);
topo.AddNode(outputnode);
hr = sourcenode.ConnectOutput(0, outputnode, 0);
}
mediaSession.SetTopology(0, topo);
Hide();
uint eventtype = 0;
while (eventtype != MESessionTopologyStatus)
{
mediaSession.GetEvent(0, out IMFMediaEvent mediaevent);
mediaevent.GetType(out eventtype);
mediaevent = null;
}
Guid guid_ratecontrol = typeof(IMFRateControl).GUID;
MFGetService(mediaSession as IUnknown, ref MF_RATE_CONTROL_SERVICE, ref guid_ratecontrol, out IUnknown _ratecontrol);
IMFRateControl ratecontrol = _ratecontrol as IMFRateControl;
hr = ratecontrol.SetRate(false, dwrate >= 0 ? dwrate * 7 / 10 + 1 : 1 / (1 + dwrate / -10 * 7));
try
{
Guid guid_audiopolicy = typeof(IMFAudioPolicy).GUID;
hr = MFGetService(mediaSession as IUnknown, ref MR_AUDIO_POLICY_SERVICE, ref guid_audiopolicy, out IUnknown _policy);
IMFAudioPolicy policy = _policy as IMFAudioPolicy;
policy.SetDisplayName(" ");
playvolume = dwvolume;
}
catch
{
}
try
{
Guid guid_videocontrol = typeof(IMFVideoDisplayControl).GUID;
hr = MFGetService(mediaSession as IUnknown, ref MR_VIDEO_RENDER_SERVICE, ref guid_videocontrol, out IUnknown _videocontrol);
IMFVideoDisplayControl videocontrol = _videocontrol as IMFVideoDisplayControl;
if (FullScreen.Checked)
{
host.Top = 0;
host.Left = 0;
host.Width = (int)System.Windows.SystemParameters.PrimaryScreenWidth;
host.Height = (int)System.Windows.SystemParameters.PrimaryScreenHeight;
}
Rectangle videopos = new Rectangle(0, 0, host.Width, host.Height);
host.videocontrol = videocontrol;
videocontrol.SetVideoPosition(null, ref videopos);
}
catch
{
}
state = "Prepared";
while (true)
{
if (state == "Playing")
{
eventtype = 0;
PropVariant prop = new PropVariant()
{
vt = (ushort)VarEnum.VT_I8,
unionmember = 0,
};
#region mediasession
if (hasvideo)
{
host.Show();
}
preventthread = new Thread(() => {
while (true)
{
if (state == "Playing")
{
while (state == "Playing")
{
if (hasvideo)
{
host.BringToFront();
}
SetAppAndSystemVolume(playvolume, false);
}
}
}
});
preventthread.Start();
hr = mediaSession.Start(Guid.Empty, prop);
while (eventtype != MESessionEnded)
{
hr = mediaSession.GetEvent(1, out IMFMediaEvent mediaevent);
if (hr == 0 && mediaevent != null)
{
mediaevent.GetType(out eventtype);
mediaevent = null;
}
Application.DoEvents();
}
host.Hide();
state = "Ended";
#endregion
}
}
}
