// Retrieve capabilities of a video device
static internal VideoCapabilities[] FromStreamConfig(IAMStreamConfig videoStreamConfig)
{
if (videoStreamConfig == null)
{
throw new ArgumentNullException("videoStreamConfig");
}
// ensure this device reports capabilities
int count, size;
int hr = videoStreamConfig.GetNumberOfCapabilities(out count, out size);
if (hr != 0)
{
Marshal.ThrowExceptionForHR(hr);
}
if (count <= 0)
{
throw new NotSupportedException("This video device does not report capabilities.");
}
if (size > Marshal.SizeOf(typeof(VideoStreamConfigCaps)))
{
throw new NotSupportedException("Unable to retrieve video device capabilities. This video device requires a larger VideoStreamConfigCaps structure.");
}
// group capabilities with similar parameters
Dictionary <ulong, VideoCapabilities> videocapsList = new Dictionary <ulong, VideoCapabilities>();
for (int i = 0; i < count; i++)
{
try
{
VideoCapabilities vc = new VideoCapabilities(videoStreamConfig, i);
ulong key = (((ulong)vc.FrameSize.Height) << 32) |
(((ulong)vc.FrameSize.Width) << 16) |
((ulong)(uint)vc.FrameRate);
if (!videocapsList.ContainsKey(key))
{
videocapsList.Add(key, vc);
}
}
catch
{
}
}
VideoCapabilities[] videocaps = new VideoCapabilities[videocapsList.Count];
videocapsList.Values.CopyTo(videocaps, 0);
return(videocaps);
}
// Configure specified pin and collect its capabilities if required
private void GetPinCapabilitiesAndConfigureSizeAndRate(ICaptureGraphBuilder2 graphBuilder, IBaseFilter baseFilter,
Guid pinCategory, Size size, int frameRate, ref VideoCapabilities[] capabilities)
{
object streamConfigObject;
graphBuilder.FindInterface(pinCategory, MediaType.Video, baseFilter, typeof(IAMStreamConfig).GUID, out streamConfigObject);
if (streamConfigObject != null)
{
IAMStreamConfig streamConfig = null;
try
{
streamConfig = (IAMStreamConfig)streamConfigObject;
}
catch (InvalidCastException)
{
}
if (streamConfig != null)
{
if (capabilities == null)
{
try
{
// get all video capabilities
capabilities = Gimela.Media.Video.DirectShow.VideoCapabilities.FromStreamConfig(streamConfig);
}
catch
{
}
}
// check if it is required to change capture settings
if ((frameRate != 0) || ((size.Width != 0) && (size.Height != 0)))
{
SetFrameSizeAndRate(streamConfig, size, frameRate);
}
}
}
// if failed resolving capabilities, then just create empty capabilities array,
// so we don't try again
if (capabilities == null)
{
capabilities = new VideoCapabilities[0];
}
}
// Retrieve capabilities of a video device
static internal VideoCapabilities[] FromStreamConfig(IAMStreamConfig videoStreamConfig)
{
if (videoStreamConfig == null)
throw new ArgumentNullException("videoStreamConfig");
// ensure this device reports capabilities
int count, size;
int hr = videoStreamConfig.GetNumberOfCapabilities(out count, out size);
if (hr != 0)
Marshal.ThrowExceptionForHR(hr);
if (count <= 0)
throw new NotSupportedException("This video device does not report capabilities.");
if (size > Marshal.SizeOf(typeof(VideoStreamConfigCaps)))
throw new NotSupportedException("Unable to retrieve video device capabilities. This video device requires a larger VideoStreamConfigCaps structure.");
// group capabilities with similar parameters
Dictionary<ulong, VideoCapabilities> videocapsList = new Dictionary<ulong, VideoCapabilities>();
for (int i = 0; i < count; i++)
{
try
{
VideoCapabilities vc = new VideoCapabilities(videoStreamConfig, i);
ulong key = (((ulong)vc.FrameSize.Height) << 32) |
(((ulong)vc.FrameSize.Width) << 16) |
((ulong)(uint)vc.FrameRate);
if (!videocapsList.ContainsKey(key))
{
videocapsList.Add(key, vc);
}
}
catch
{
}
}
VideoCapabilities[] videocaps = new VideoCapabilities[videocapsList.Count];
videocapsList.Values.CopyTo(videocaps, 0);
return videocaps;
}
// Configure specified pin and collect its capabilities if required
private void GetPinCapabilitiesAndConfigureSizeAndRate(ICaptureGraphBuilder2 graphBuilder, IBaseFilter baseFilter,
Guid pinCategory, Size size, int frameRate, ref VideoCapabilities[] capabilities)
{
object streamConfigObject;
graphBuilder.FindInterface(pinCategory, MediaType.Video, baseFilter, typeof(IAMStreamConfig).GUID, out streamConfigObject);
if (streamConfigObject != null)
{
IAMStreamConfig streamConfig = null;
try
{
streamConfig = (IAMStreamConfig)streamConfigObject;
}
catch (InvalidCastException)
{
}
if (streamConfig != null)
{
if (capabilities == null)
{
try
{
// get all video capabilities
capabilities = Gimela.Media.Video.DirectShow.VideoCapabilities.FromStreamConfig(streamConfig);
}
catch
{
}
}
// check if it is required to change capture settings
if ((frameRate != 0) || ((size.Width != 0) && (size.Height != 0)))
{
SetFrameSizeAndRate(streamConfig, size, frameRate);
}
}
}
// if failed resolving capabilities, then just create empty capabilities array,
// so we don't try again
if (capabilities == null)
{
capabilities = new VideoCapabilities[0];
}
}
