public AmMediaType GetMinimumFreq(IPin OutputPin)
{
AmMediaType[] types = OutputPin.GetAllMediaTypes();
IAMStreamConfig cfg = (IAMStreamConfig)OutputPin;
AmMediaType currentType = cfg.GetFormat();
WaveFormatEx currentWave = currentType.GetStruct<WaveFormatEx>();
ShowMsg(String.Format(
"CurrentOut: bps:{0} bit; ch:{1}, freq:{2} Hz",
currentWave.wBitsPerSample, currentWave.nChannels, currentWave.nSamplesPerSec
));
AmMediaType minimum = currentType;
foreach (AmMediaType type in types)
{
WaveFormatEx wave = type.GetStruct<WaveFormatEx>();
ShowMsg(String.Format(
"bps:{0} bit; ch:{1}, freq:{2} Hz",
wave.wBitsPerSample, wave.nChannels, wave.nSamplesPerSec
));
if (wave.wFormatTag == currentWave.wFormatTag &&
wave.nChannels == currentWave.nChannels &&
wave.wBitsPerSample == currentWave.wBitsPerSample &&
wave.nSamplesPerSec < currentWave.nSamplesPerSec)
{
minimum = type;
currentWave = minimum.GetStruct<WaveFormatEx>();
}
}
ShowMsg(String.Format(
"Selected: bps:{0} bit; ch:{1}, freq:{2} Hz",
currentWave.wBitsPerSample, currentWave.nChannels, currentWave.nSamplesPerSec
));
return minimum;
}