Decouple capture timestamp and reference time

media/capture/video/win/sink_input_pin_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/sink_input_pin_win.h"
 
 #include <cstring>
 
 // Avoid including strsafe.h via dshow as it will cause build warnings.
 #define NO_DSHOW_STRSAFE
 #include <dshow.h>
 #include <stdint.h>
 
 #include "base/logging.h"
 #include "base/macros.h"
+#include "media/base/timestamp_constants.h"
 
 namespace media {
 
 const REFERENCE_TIME kSecondsToReferenceTime = 10000000;
 
 static DWORD GetArea(const BITMAPINFOHEADER& info_header) {
   return info_header.biWidth * info_header.biHeight;
 }
 
 SinkInputPin::SinkInputPin(IBaseFilter* filter, SinkFilterObserver* observer)
@@ skipping 168 matching lines @@
 
   if (length <= 0) {
     DLOG(WARNING) << "Media sample length is 0 or less.";
     return S_FALSE;
   }
 
   if (FAILED(sample->GetPointer(&buffer)))
     return S_FALSE;
 
   REFERENCE_TIME start_time, end_time;
-  base::TimeTicks timestamp;
+  base::TimeDelta timestamp = media::kNoTimestamp();
   if (SUCCEEDED(sample->GetTime(&start_time, &end_time))) {
     DCHECK(start_time <= end_time);
-    timestamp += base::TimeDelta::FromMicroseconds(start_time / 10);
-  } else {
-    timestamp = base::TimeTicks::Now();
+    timestamp = base::TimeDelta::FromMicroseconds(start_time / 10);
   }
 
-
   observer_->FrameReceived(buffer, length, timestamp);
   return S_OK;
 }
 
 SinkInputPin::~SinkInputPin() {
 }
 
 }  // namespace media