/// <inheritdoc />
/// <summary>
/// Acquires a single frame
/// </summary>
/// <inheritdoc />
/// <summary>
/// Acquires a single frame from this provider
/// </summary>
public override void AcquireFrame()
{
for (int i = 0; i < this.sources.Length; i++)
{
DxgiCaptureSource source = this.sources[i];
try {
OutputDuplicateFrameInformation info;
Resource desktopResource = null;
do
{
// release previous frame if last capture attempt failed
if (desktopResource != null)
{
desktopResource.Dispose();
source.Duplication.ReleaseFrame();
}
// try to capture a frame
source.Duplication.AcquireNextFrame(DuplicationFrameTimeout,
out info,
out desktopResource);
} while (info.TotalMetadataBufferSize == 0);
this.lastPresentTime = info.LastPresentTime;
using (var srcResource = desktopResource.QueryInterface <SharpDX.Direct3D11.Resource>())
using (var destResource = source.Texture.QueryInterface <SharpDX.Direct3D11.Resource>()) {
// copy the entire screen region to the target texture
source.Context.CopySubresourceRegion(
srcResource,
0,
source.Subregion,
destResource,
0);
}
// release resources
desktopResource.Dispose();
source.Duplication.ReleaseFrame();
} catch (SharpDXException exception) when(exception.ResultCode == ResultCode.AccessLost ||
exception.ResultCode == ResultCode.DeviceHung ||
exception.ResultCode == ResultCode.DeviceRemoved)
{
// device has been lost - we can't ignore this and should try to reinitialize the D3D11 device until it's
// available again (...)
// we'll be receiving black/unsynced frames beyond this point - it is OK until we restore the device
while (true)
{
try {
this.sources[i] = DxgiCaptureSource.Recreate(this.virtualRect);
break; // successfully restored capture source
} catch (SharpDXException) {
/* could not restore the capture source - keep trying */
}
}
}
}
}
/// <summary>
/// Creates a capture source with the same properties as this one
/// </summary>
/// <param name="bounds">Target screen bounds</param>
/// <returns>A new <see cref="DxgiCaptureSource"/> instance</returns>
internal static DxgiCaptureSource Recreate(Rectangle bounds)
{
DxgiCaptureSource source = null;
using (var factory = new Factory1()) {
if (factory.GetAdapterCount1() == 0)
{
throw new NotSupportedException("No suitable video adapters found");
}
foreach (Adapter1 adapter in factory.Adapters1)
{
foreach (Output output in adapter.Outputs)
{
var intersection = Rectangle.Intersect(bounds, output.Description.DesktopBounds);
if (intersection.Width > 0 && intersection.Height > 0)
{
source = new DxgiCaptureSource(adapter, output, new Rectangle(intersection.X,
intersection.Y,
intersection.Width,
intersection.Height));
break;
}
output.Dispose();
}
adapter.Dispose();
if (source != null)
{
break;
}
}
}
return(source ?? throw new Exception("No suitable capture sources were found"));
}