c4e9d210b3
DXGI capturer highly depends on video adapter and its driver, as well as Windows itself. I recently found it cannot work on my virtualbox instance any more, which indicates it may not work well on some specific systems. What worse is, the APIs do not return a failure in such case. So this change adds a BlankDetectorDesktopCapturerWrapper, which samples several pixels in the frame returned by a DesktopCapturer implementation. If all the pixels selected are blank, this wrapper returns a failure. A typical usage is to combine BlankDetectorDesktopCapturerWrapper with FallbackDesktopCapturerWrapper, and use GDI capturer in case of failure. Usually less than 500 pixels are checked, so the BlankDetectorDesktopCapturerWrapper should not impact the capturer performance. This change is expected to resolve bug 682112 in another dimension. BUG=682112 Review-Url: https://codereview.webrtc.org/2709523003 Cr-Commit-Position: refs/heads/master@{#16984}
Name: WebRTC URL: http://www.webrtc.org Version: 90 License: BSD License File: LICENSE Description: WebRTC provides real time voice and video processing functionality to enable the implementation of PeerConnection/MediaStream. Third party code used in this project is described in the file LICENSE_THIRD_PARTY.