//
//Method to start to play a media file
//
private void LoadFile(string fName)
{
try
{
//get the graph filter ready to render
graphBuilder.RenderFile(fName, null);
//set the trackbar
OABool bCsf, bCsb;
mediaPos.CanSeekBackward(out bCsb);
mediaPos.CanSeekForward(out bCsf);
isSeeking = (bCsb == OABool.True) && (bCsf == OABool.True);
if (isSeeking)
{
trackBar1.Enabled = true;
}
else
{
trackBar1.Enabled = false;
}
trackBar1.Minimum = 0;
double duration;
mediaPos.get_Duration(out duration);
trackBar1.Maximum = (int)(duration * 100.0);
Text = fName;
//check for the ability to step
frameStep = graphBuilder as IVideoFrameStep;
if (frameStep.CanStep(1, null) == 0)
{
canStep = true;
buttonFramestep.Enabled = true;
}
//prepare and set the video window
videoWin = graphBuilder as IVideoWindow;
videoWin.put_Owner((IntPtr)panel1.Handle);
videoWin.put_WindowStyle(WindowStyle.Child | WindowStyle.ClipSiblings | WindowStyle.ClipChildren);
Rectangle rc = panel1.ClientRectangle;
videoWin.SetWindowPosition(0, 0, rc.Right, rc.Bottom);
mediaEvt.SetNotifyWindow((IntPtr)this.Handle, WM_GRAPHNOTIFY, (IntPtr)0);
//set the different values for controls
trackBar1.Value = 0;
minutes = (int)duration / 60;
seconds = (int)duration % 60;
statusBar1.Panels[0].Text = "Duration: " + minutes.ToString("D2")
+ ":m" + seconds.ToString("D2") + ":s";
graphState = State.Playing;
this.buttonPlay.Text = "Pause";
//start the playback
mediaCtrl.Run();
}
catch (Exception) { Text = "Error loading file"; }
}
protected override bool IsMediaSeekable()
{
OABool seekFwd = OABool.False, seekBwd = OABool.False;
if (mediaPosition != null)
{
int hr = mediaPosition.CanSeekForward(out seekFwd);
DsError.ThrowExceptionForHR(hr);
hr = mediaPosition.CanSeekBackward(out seekBwd);
DsError.ThrowExceptionForHR(hr);
}
return(seekFwd != OABool.False && seekBwd != OABool.False);
}
void TestCanSeek()
{
int hr;
OABool b, f;
hr = m_mediaPosition.CanSeekBackward(out b);
DsError.ThrowExceptionForHR(hr);
Debug.Assert(b == OABool.True, "CanSeekBackward");
hr = m_mediaPosition.CanSeekForward(out f);
DsError.ThrowExceptionForHR(hr);
Debug.Assert(f == OABool.True, "CanSeekForward");
}