private void TestMinorChannel()
{
int hr = 0;
int minor = 0;
hr = atscChannelTR.put_MinorChannel(20);
DsError.ThrowExceptionForHR(hr);
hr = atscChannelTR.get_MinorChannel(out minor);
DsError.ThrowExceptionForHR(hr);
// I don't know why but this method always return -1 meaning according to the doc
// "that the tuner should tune to the first valid minor channel it finds".
// I suppose that it's a normal behaviour since a complete BDA graph is not built...
// Debug.Assert(minor == 20, "IATSCChannelTuneRequest.get_MinorChannel / put_MinorChannel");
}
protected virtual Channel GetCurrentChannel()
{
if (!channelSet || (this.State != GraphState.Running))
{
return(new Channel());
}
// Debug.WriteLine("null -> get_TuneRequest");
ITuneRequest request;
int hr = tuner.get_TuneRequest(out request);
// Debug.WriteLine(hr.ToString("X8"));
DsError.ThrowExceptionForHR(hr);
// Debug.WriteLine("ITuneRequest -> IATSCChannelTuneRequest");
IATSCChannelTuneRequest atscRequest = (IATSCChannelTuneRequest)request;
ILocator locator;
// Debug.WriteLine("null -> get_Locator");
hr = atscRequest.get_Locator(out locator);
// Debug.WriteLine(hr.ToString("X8"));
DsError.ThrowExceptionForHR(hr);
// Debug.WriteLine("ILocator -> IATSCLocator");
IATSCLocator atscLocator = (IATSCLocator)locator;
int freq, channel, major, minor;
hr = atscLocator.get_CarrierFrequency(out freq);
hr = atscLocator.get_PhysicalChannel(out channel);
hr = atscRequest.get_Channel(out major);
hr = atscRequest.get_MinorChannel(out minor);
Channel known = KnownChannels.FindClosest(new Channel(-1, -1, major, minor));
if (known != null)
{
if ((known.MajorChannel == major) &&
(known.MinorChannel == minor))
{
return(known);
}
}
return(new Channel(freq, channel, major, minor));
}
protected override Channel GetChannel()
{
ITuneRequest request;
int hr = tuner.get_TuneRequest(out request);
DsError.ThrowExceptionForHR(hr);
IATSCChannelTuneRequest atscRequest = (IATSCChannelTuneRequest)request;
ILocator locator;
atscRequest.get_Locator(out locator);
IATSCLocator atscLocator = (IATSCLocator)locator;
int freq, channel, major, minor;
hr = atscLocator.get_CarrierFrequency(out freq);
hr = atscLocator.get_PhysicalChannel(out channel);
hr = atscRequest.get_Channel(out major);
hr = atscRequest.get_MinorChannel(out minor);
return(new Channel(freq, channel, major, minor));
}