Decouple capture timestamp and reference time

media/capture/video/win/video_capture_device_mf_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_mf_win.h"
 
 #include <mfapi.h>
 #include <mferror.h>
 #include <stddef.h>
 
@@ skipping 91 matching lines @@
   STDMETHOD_(ULONG, AddRef)() override {
     base::RefCountedThreadSafe<MFReaderCallback>::AddRef();
     return 1U;
   }
 
   STDMETHOD_(ULONG, Release)() override {
     base::RefCountedThreadSafe<MFReaderCallback>::Release();
     return 1U;
   }
 
-  STDMETHOD(OnReadSample)(HRESULT status,
-                          DWORD stream_index,
-                          DWORD stream_flags,
-                          LONGLONG time_stamp,
-                          IMFSample* sample) override {
-    base::TimeTicks stamp(base::TimeTicks::Now());
+  STDMETHOD(OnReadSample)
+  (HRESULT status,
+   DWORD stream_index,
+   DWORD stream_flags,
+   LONGLONG raw_time_stamp,
+   IMFSample* sample) override {
+    base::TimeTicks reference_time(base::TimeTicks::Now());
+    base::TimeDelta timestamp =
+        base::TimeDelta::FromMicroseconds(raw_time_stamp / 10);
     if (!sample) {
-      observer_->OnIncomingCapturedData(NULL, 0, 0, stamp);
+      observer_->OnIncomingCapturedData(NULL, 0, 0, reference_time, timestamp);
       return S_OK;
     }
 
     DWORD count = 0;
     sample->GetBufferCount(&count);
 
     for (DWORD i = 0; i < count; ++i) {
       ScopedComPtr<IMFMediaBuffer> buffer;
       sample->GetBufferByIndex(i, buffer.Receive());
       if (buffer.get()) {
         DWORD length = 0, max_length = 0;
         BYTE* data = NULL;
         buffer->Lock(&data, &max_length, &length);
-        observer_->OnIncomingCapturedData(data, length, 0, stamp);
+        observer_->OnIncomingCapturedData(data, length, 0, reference_time,
+                                          timestamp);
         buffer->Unlock();
       }
     }
     return S_OK;
   }
 
   STDMETHOD(OnFlush)(DWORD stream_index) override {
     if (wait_event_) {
       wait_event_->Signal();
       wait_event_ = NULL;
@@ skipping 148 matching lines @@
   // do not wait at all after getting MEVideoCaptureDeviceRemoved event.
   // See issue/226396.
   if (wait)
     flushed.TimedWait(base::TimeDelta::FromMilliseconds(kFlushTimeOutInMs));
 }
 
 void VideoCaptureDeviceMFWin::OnIncomingCapturedData(
     const uint8_t* data,
     int length,
     int rotation,
-    const base::TimeTicks& time_stamp) {
+    base::TimeTicks reference_time,
+    base::TimeDelta timestamp) {
   base::AutoLock lock(lock_);
   if (data && client_.get()) {
     client_->OnIncomingCapturedData(data, length, capture_format_, rotation,
-                                    time_stamp);
+                                    reference_time, timestamp);
   }
 
   if (capture_) {
     HRESULT hr =
         reader_->ReadSample(kFirstVideoStream, 0, NULL, NULL, NULL, NULL);
     if (FAILED(hr)) {
       // If running the *VideoCap* unit tests on repeat, this can sometimes
       // fail with HRESULT_FROM_WINHRESULT_FROM_WIN32(ERROR_INVALID_FUNCTION).
       // It's not clear to me why this is, but it is possible that it has
       // something to do with this bug:
       // http://support.microsoft.com/kb/979567
       OnError(FROM_HERE, hr);
     }
   }
 }
 
 void VideoCaptureDeviceMFWin::OnError(
     const tracked_objects::Location& from_here,
     HRESULT hr) {
   if (client_.get()) {
     client_->OnError(
         from_here,
         base::StringPrintf("VideoCaptureDeviceMFWin: %s",
                            logging::SystemErrorCodeToString(hr).c_str()));
   }
 }
 
 }  // namespace media