public override void SetRate(double rate)
{
if (IsGraphSeekable)
{
var hr = MediaSeeking.SetRate(rate);
if (hr == DsHlp.S_OK)
{
_rate = rate;
}
}
}
public override long GetCurrentPosition()
{
var result = 0L;
if (IsGraphSeekable)
{
MediaSeeking.GetCurrentPosition(out result);
}
return(result);
}
/// <summary>
/// 停止
/// </summary>
public void Stop()
{
CheckAlive();
Status = GraphState.Stopped;
MediaControl.Stop();
long pos = 0;
MediaSeeking.SetPositions(ref pos, AMSeekingSeekingFlags.AbsolutePositioning, ref pos, AMSeekingSeekingFlags.NoPositioning);
MediaControl.StopWhenReady();
if (MediaStop != null)
{
MediaStop(this, EventArgs.Empty);
}
}
public override void SetCurrentPosition(long time)
{
if (IsGraphSeekable)
{
var state = GraphState;
PauseGraph();
long pStop = 0;
MediaSeeking.SetPositions(ref time, SeekingFlags.AbsolutePositioning, ref pStop, SeekingFlags.NoPositioning);
switch (state)
{
case GraphState.Running:
ResumeGraph();
break;
case GraphState.Stopped:
MediaControl.Stop();
GraphState = GraphState.Stopped;
break;
}
}
}
public override void BuildUp(FilterGraphBuilderParameters parameters)
{
// Create filter graph manager
InitializeGraphBuilder(() =>
{
object comobj = null;
try
{
var type = Type.GetTypeFromCLSID(Clsid.FilterGraph, true);
comobj = Activator.CreateInstance(type);
var graphBuilder = (IGraphBuilder)comobj;
comobj = null; // important! (see the finally block)
return(graphBuilder);
}
catch (Exception e)
{
throw new FilterGraphBuilderException(GraphBuilderError.FilterGraphManager, e);
}
finally
{
if (comobj != null)
{
Marshal.FinalReleaseComObject(comobj);
}
}
});
// Adding a source filter for a specific video file
_sourceFilterHandler = SourceFilterHandlerFactory.AddSourceFilter(GraphBuilder, parameters.Source);
// QUERY the filter graph interfaces
InitializeMediaEventEx(parameters.MediaWindowHandle);
InitializeFilterGraph2();
InitializeMediaControl();
InitializeMediaSeeking();
InitializeBasicAudio();
// create a renderer
ThrowExceptionForHRPointer errorFunc = delegate(int hrCode, GraphBuilderError error)
{
hrCode.ThrowExceptionForHR(error);
};
Renderer = RendererBase.AddRenderer(GraphBuilder, parameters.PreferredVideoRenderer, errorFunc, parameters.MediaWindowHandle);
DoBuildGraph();
SeekingCapabilities caps = SeekingCapabilities.CanGetDuration;
int hr = MediaSeeking.CheckCapabilities(ref caps);
if (hr == DsHlp.S_OK)
{
_isGraphSeekable = true;
long rtDuration;
MediaSeeking.GetDuration(out rtDuration);
_duration = rtDuration;
}
// MEDIA SIZE
int height, arWidth;
int width, arHeight;
Renderer.GetNativeVideoSize(out width, out height, out arWidth, out arHeight);
double w = arWidth;
double h = arHeight;
_aspectRatio = w / h;
_sourceRect = new GDI.RECT {
left = 0, top = 0, right = width, bottom = height
};
// if (FindSplitter(pFilterGraph))
// ReportUnrenderedPins(pFilterGraph); // then we can raise OnFailedStreamsAvailable
GatherMediaInfo(parameters.Source);
}
