public DSVideoPlayer(string filename, GraphicsDevice graphicsDevice)
{
try
{
// Open DirectShow Interfaces
InitInterfaces();
Info = new DSVideoInfo();
// Create a SampleGrabber Filter and add it to the FilterGraph
SampleGrabber sg = new SampleGrabber();
ISampleGrabber sampleGrabber = (ISampleGrabber)sg;
DsError.ThrowExceptionForHR(FG_GraphBuilder.AddFilter((IBaseFilter)sg, "Grabber"));
// Setup Media type info for the SampleGrabber
AMMediaType mt = new AMMediaType();
mt.majorType = DSVideoInfo.MEDIATYPE_Video; // Video
mt.subType = DSVideoInfo.MEDIASUBTYPE_RGB24; // RGB24
mt.formatType = DSVideoInfo.FORMAT_VideoInfo; // VideoInfo
DsError.ThrowExceptionForHR(sampleGrabber.SetMediaType(mt));
//// Construct the rest of the FilterGraph
DsError.ThrowExceptionForHR(FG_GraphBuilder.RenderFile(filename, null));
Info.FileName = filename;
//// Set SampleGrabber Properties
DsError.ThrowExceptionForHR(sampleGrabber.SetBufferSamples(true));
DsError.ThrowExceptionForHR(sampleGrabber.SetOneShot(false));
DsError.ThrowExceptionForHR(sampleGrabber.SetCallback((ISampleGrabberCB)this, 1));
// Hide Default Video Window
IVideoWindow pVideoWindow = (IVideoWindow)FG_GraphBuilder;
DsError.ThrowExceptionForHR(pVideoWindow.put_AutoShow(OABool.False));
//// Create AMMediaType to capture video information
AMMediaType MediaType = new AMMediaType();
DsError.ThrowExceptionForHR(sampleGrabber.GetConnectedMediaType(MediaType));
VideoInfoHeader pVideoHeader = new VideoInfoHeader();
Marshal.PtrToStructure(MediaType.formatPtr, pVideoHeader);
// Store video information
Info.Height = pVideoHeader.BmiHeader.Height;
Info.Width = pVideoHeader.BmiHeader.Width;
Info.AvgTimePerFrame = pVideoHeader.AvgTimePerFrame;
Info.BitRate = pVideoHeader.BitRate;
DsError.ThrowExceptionForHR(FG_MediaSeeking.GetDuration(out Info.Duration));
// Create byte arrays to hold video data
videoFrameBytes = new byte[(Info.Height * Info.Width) * 4]; // RGBA format (4 bytes per pixel)
bgrData = new byte[(Info.Height * Info.Width) * 3]; // BGR24 format (3 bytes per pixel)
// Create Output Frame Texture2D with the height and width of the video
outputFrame = new Texture2D(graphicsDevice, Info.Width, Info.Height, 1, TextureUsage.None, SurfaceFormat.Color);
}
catch (Exception ex)
{
throw new Exception("不能加载或播放该视频: " + ex.Message);
}
}
/// <summary>
/// Stops playing the video
/// </summary>
public void Stop()
{
StoppingEvent.Set();
// Stop the FilterGraph
DsError.ThrowExceptionForHR(FG_MediaControl.Stop());
// Reset the current position
DsError.ThrowExceptionForHR(FG_MediaSeeking.SetPositions(0, AMSeekingSeekingFlags.AbsolutePositioning, 0, AMSeekingSeekingFlags.NoPositioning));
// Update VideoState
currentState = VideoState.Stopped;
}
/// <summary>
/// Updates the Output Frame data using data from the video stream. Call this in Game.Update().
/// </summary>
public void Update()
{
// Remove the OutputFrame from the GraphicsDevice to prevent an InvalidOperationException on the SetData line.
if (outputFrame.GraphicsDevice.Textures[0] == outputFrame)
{
outputFrame.GraphicsDevice.Textures[0] = null;
}
// Set video data into the Output Frame
outputFrame.SetData <byte>(videoFrameBytes);
// Update current position read-out
DsError.ThrowExceptionForHR(FG_MediaSeeking.GetCurrentPosition(out currentPosition));
if (currentPosition >= Duration * 10000000)
{
DsError.ThrowExceptionForHR(FG_MediaSeeking.SetPositions(0, AMSeekingSeekingFlags.AbsolutePositioning, 0, AMSeekingSeekingFlags.NoPositioning));
}
}