DxgiOutputDuplicator AcquireNextFrame timeout can be 0

webrtc/modules/desktop_capture/win/dxgi_output_duplicator.cc

 /*
  *  Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
@@ skipping 15 matching lines @@
 
 namespace webrtc {
 
 using Microsoft::WRL::ComPtr;
 
 namespace {
 
 // Timeout for AcquireNextFrame() call.
 // DxgiDuplicatorController leverages external components to do the capture
 // scheduling. So here DxgiOutputDuplicator does not need to actively wait for a
-// new frame. 1 millisecond is the minimium value AcquireNextFrame() accepts.
-const int kAcquireTimeoutMs = 1;
+// new frame.
+const int kAcquireTimeoutMs = 0;
 
 DesktopRect RECTToDesktopRect(const RECT& rect) {
   return DesktopRect::MakeLTRB(rect.left, rect.top, rect.right, rect.bottom);
 }
 
 Rotation DxgiRotationToRotation(DXGI_MODE_ROTATION rotation) {
   switch (rotation) {
     case DXGI_MODE_ROTATION_IDENTITY:
     case DXGI_MODE_ROTATION_UNSPECIFIED:
       return Rotation::CLOCK_WISE_0;
@@ skipping 295 matching lines @@
 }
 
 int64_t DxgiOutputDuplicator::num_frames_captured() const {
 #if !defined(NDEBUG)
   RTC_DCHECK_EQ(!!last_frame_, num_frames_captured_ > 0);
 #endif
   return num_frames_captured_;
 }
 
 }  // namespace webrtc