/// <summary>
/// Returns a list of the enabled webcam devices of the system. Returns null if no enabled webcam devices are present. See also: Player.Webcam.DeviceCount.
/// </summary>
public WebcamDevice[] GetDevices()
{
WebcamDevice[] devices = null;
HResult result;
MFExtern.MFCreateAttributes(out IMFAttributes attributes, 1);
attributes.SetGUID(MFAttributesClsid.MF_DEVSOURCE_ATTRIBUTE_SOURCE_TYPE, MFAttributesClsid.MF_DEVSOURCE_ATTRIBUTE_SOURCE_TYPE_VIDCAP_GUID);
result = MFExtern.MFEnumDeviceSources(attributes, out IMFActivate[] webcams, out int webcamCount);
if (result == Player.NO_ERROR && webcams != null)
{
devices = new WebcamDevice[webcamCount];
for (int i = 0; i < webcamCount; i++)
{
devices[i] = new WebcamDevice();
#pragma warning disable IDE0059 // Unnecessary assignment of a value
webcams[i].GetString(MFAttributesClsid.MF_DEVSOURCE_ATTRIBUTE_FRIENDLY_NAME, _base._textBuffer1, _base._textBuffer1.Capacity, out int length);
devices[i]._name = _base._textBuffer1.ToString();
webcams[i].GetString(MFAttributesClsid.MF_DEVSOURCE_ATTRIBUTE_SOURCE_TYPE_VIDCAP_SYMBOLIC_LINK, _base._textBuffer1, _base._textBuffer1.Capacity, out length);
#pragma warning restore IDE0059 // Unnecessary assignment of a value
devices[i]._id = _base._textBuffer1.ToString();
Marshal.ReleaseComObject(webcams[i]);
}
}
Marshal.ReleaseComObject(attributes);
_base._lastError = result;
return(devices);
}
internal WebcamFormat GetHighFormat(WebcamDevice webcam, bool photo)
{
WebcamFormat format = null;
WebcamFormat[] formats = GetWebcamFormats(webcam._id, false, false, 0, 0, 0);
if (formats != null)
{
format = formats[0];
int count = formats.Length;
int frameRate = photo ? 1 : 15;
for (int i = 1; i < count; i++)
{
if (formats[i]._width >= format._width &&
formats[i]._height >= format._height &&
formats[i]._frameRate >= format._frameRate)
{
format = formats[i];
}
else if (formats[i]._width > format._width &&
formats[i]._height > format._height &&
formats[i]._frameRate >= frameRate)
{
format = formats[i];
}
}
}
return(format);
}
internal WebcamFormat GetLowFormat(WebcamDevice webcam)
{
WebcamFormat format = null;
WebcamFormat[] formats = GetWebcamFormats(webcam._id, false, false, 0, 0, 0);
if (formats != null)
{
format = formats[0];
int count = formats.Length;
for (int i = 1; i < count; i++)
{
if (formats[i]._width <= format._width &&
formats[i]._height <= format._height &&
formats[i]._height >= 100 &&
formats[i]._frameRate <= format._frameRate &&
formats[i]._frameRate >= 15)
{
format = formats[i];
}
}
}
return(format);
}
/// <summary>
/// Returns the available video output formats (or null) of the specified webcam that match the specified values. The formats can be used with the Player.Play methods for webcams.
/// </summary>
/// <param name="webcam">The webcam whose video output formats are to be obtained.</param>
/// <param name="exact">A value that indicates whether the specified values must exactly match the webcam formats or whether they are minimum values.</param>
/// <param name="width">The (minimum) width of the video frames. Use -1 to ignore this parameter.</param>
/// <param name="height">The (minimum) height of the video frames. Use -1 to ignore this parameter.</param>
/// <param name="frameRate">The (minimum) frame rate of the video output format. Use -1 to ignore this parameter.</param>
public WebcamFormat[] GetFormats(WebcamDevice webcam, bool exact, int width, int height, float frameRate)
{
return(GetWebcamFormats(webcam._id, true, exact, width, height, frameRate));
}
/// <summary>
/// Returns the available video output formats of the specified webcam. The formats can be used with the Player.Play methods for webcams.
/// </summary>
/// <param name="webcam">The webcam whose video output formats are to be obtained.</param>
public WebcamFormat[] GetFormats(WebcamDevice webcam)
{
return(GetWebcamFormats(webcam._id, false, false, 0, 0, 0));
}
