FileVideoCaptureDevice: If frames are lagging behind, don't try to catch up

media/video/capture/file_video_capture_device.cc

 // Copyright 2013 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/video/capture/file_video_capture_device.h"
 
 
 #include "base/bind.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/string_piece.h"
@@ skipping 231 matching lines @@
                                   capture_format_,
                                   0,
                                   current_time);
   // Reschedule next CaptureTask.
   const base::TimeDelta frame_interval =
       base::TimeDelta::FromMicroseconds(1E6 / capture_format_.frame_rate);
   if (next_frame_time_.is_null()) {
     next_frame_time_ = current_time + frame_interval;
   } else {
     next_frame_time_ += frame_interval;
+    // Don't accumulate any debt if we are lagging behind - just post next frame
+    // immediately and continue as normal.
+    if (next_frame_time_ < current_time)
+      next_frame_time_ = current_time;
   }
   base::MessageLoop::current()->PostDelayedTask(
       FROM_HERE,
       base::Bind(&FileVideoCaptureDevice::OnCaptureTask,
                  base::Unretained(this)),
       next_frame_time_ - current_time);
 }
 
 }  // namespace media