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

media/capture/video/mac/video_capture_device_qtkit_mac.mm

Index: media/capture/video/mac/video_capture_device_qtkit_mac.mm
diff --git a/media/capture/video/mac/video_capture_device_qtkit_mac.mm b/media/capture/video/mac/video_capture_device_qtkit_mac.mm
index 1ea4c9e44988f8cfb18d5f03ba8f2c13f236d948..484782e88d47e7fe5a082759628c11246e382c49 100644
--- a/media/capture/video/mac/video_capture_device_qtkit_mac.mm
+++ b/media/capture/video/mac/video_capture_device_qtkit_mac.mm
@@ -324,9 +324,16 @@
                        &aspectDenominator);
     }
 
+    QTTime qt_timestamp = [sampleBuffer presentationTime];

[mcasas, 2015/10/31 03:24:25]

const

[qiangchen, 2015/11/02 18:21:21]

Done.

     // Deliver the captured video frame.
+    const int microseconds_per_second = 1000000;
+    const base::TimeTicks timestamp =
+        base::TimeTicks() +
+        base::TimeDelta::FromMicroseconds(qt_timestamp.timeValue *
+                                          microseconds_per_second /
+                                          qt_timestamp.timeScale);
     frameReceiver_->ReceiveFrame(addressToPass, frameSize, captureFormat,
-                                 aspectNumerator, aspectDenominator);
+                                 aspectNumerator, aspectDenominator, timestamp);
 
     CVPixelBufferUnlockBaseAddress(videoFrame, kLockFlags);
   }