protected ArrayList findAudioSources(ICaptureGraphBuilder2 graphBuilder, IBaseFilter deviceFilter)
{
ArrayList sources = new ArrayList();
IAMAudioInputMixer audioInputMixer = deviceFilter as IAMAudioInputMixer;
if (audioInputMixer != null)
{
// Get a pin enumerator off the filter
IEnumPins pinEnum;
int hr = deviceFilter.EnumPins(out pinEnum);
pinEnum.Reset();
if ((hr == 0) && (pinEnum != null))
{
// Loop through each pin
IPin[] pins = new IPin[1];
#if VS2003 || DSHOWNET
int f;
#else
IntPtr f = IntPtr.Zero;
#endif
do
{
// Get the next pin
#if VS2003 || DSHOWNET
hr = pinEnum.Next(1, pins, out f);
#else
hr = pinEnum.Next(1, pins, f);
#endif
if ((hr == 0) && (pins[0] != null))
{
// Is this an input pin?
PinDirection dir = PinDirection.Output;
hr = pins[0].QueryDirection(out dir);
if ((hr == 0) && (dir == (PinDirection.Input)))
{
// Add the input pin to the sources list
AudioSource source = new AudioSource(pins[0]);
sources.Add(source);
}
pins[0] = null;
}
}while(hr == 0);
Marshal.ReleaseComObject(pinEnum); pinEnum = null;
}
}
// If there is only one source, don't return it
// because there is nothing for the user to choose.
// (Hopefully that single source is already enabled).
if (sources.Count == 1)
{
sources.Clear();
}
return(sources);
}
public void DoTests()
{
// Get an audio device
m_AudioFilter = GetAudioFilter();
// While some IAMAudioImputMixer methods work on both filters
// and pins, some (like Enable) require a pin. Get the first input pin.
IPin inPin = DsFindPin.ByDirection(m_AudioFilter, PinDirection.Input, 0);
// QI to an IAMAudioInputMixer
m_iaim = inPin as IAMAudioInputMixer;
try
{
TestMixLevel();
TestEnable();
TestMono();
TestLoudness();
TestBass();
TestTreble();
TestPan();
}
finally
{
if (m_AudioFilter != null)
{
Marshal.ReleaseComObject(m_AudioFilter);
m_AudioFilter = null;
}
if (inPin != null)
{
Marshal.ReleaseComObject(inPin);
inPin = null;
}
m_iaim = null;
}
}
