Win Video Capture: Sending the timestamps provided by the driver to the capture pipeline

media/capture/video/win/video_capture_device_win.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "media/capture/video/win/video_capture_device_win.h"
 
 #include <ks.h>
 #include <ksmedia.h>
 
 #include <algorithm>
@@ skipping 429 matching lines @@
   }
 
   graph_builder_->Disconnect(output_capture_pin_.get());
   graph_builder_->Disconnect(input_sink_pin_.get());
 
   client_.reset();
   state_ = kIdle;
 }
 
 // Implements SinkFilterObserver::SinkFilterObserver.
-void VideoCaptureDeviceWin::FrameReceived(const uint8* buffer, int length) {
-  client_->OnIncomingCapturedData(buffer, length, capture_format_, 0,
-                                  base::TimeTicks::Now());
+void VideoCaptureDeviceWin::FrameReceived(
+    const uint8* buffer,
+    int length,
+    REFERENCE_TIME raw_timestamp) {
+  client_->OnIncomingCapturedData(
+      buffer,
+      length,
+      capture_format_,
+      0,
+      base::TimeTicks() +

[mcasas, 2015/09/09 23:33:27]

Funny you need to add a dummy ctor to add a TimeDelta. Hmm.

[qiangchen, 2015/09/10 18:03:01]

TimeTicks has only static function FromInternalValue which can return a non-zero
instance. 

In my previous CL, Dale Curtis thought it was unsafe to use that function, in
case that in the future the unit for internal value would change. 

+        base::TimeDelta::FromMicroseconds(raw_timestamp / 10));
 }
 
 bool VideoCaptureDeviceWin::CreateCapabilityMap() {
   DCHECK(thread_checker_.CalledOnValidThread());
   ScopedComPtr<IAMStreamConfig> stream_config;
   HRESULT hr = output_capture_pin_.QueryInterface(stream_config.Receive());
   if (FAILED(hr)) {
     DPLOG(ERROR) << "Failed to get IAMStreamConfig interface from "
                     "capture device: " << logging::SystemErrorCodeToString(hr);
     return false;
@@ skipping 109 matching lines @@
     DVLOG(2) << "Anti-flicker setting not supported.";
   }
 }
 
 void VideoCaptureDeviceWin::SetErrorState(const std::string& reason) {
   DCHECK(thread_checker_.CalledOnValidThread());
   state_ = kError;
   client_->OnError(reason);
 }
 }  // namespace media