Use microsecond timestamp in cricket::VideoFrame.

webrtc/media/base/videocapturer.h

 /*
  *  Copyright (c) 2010 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
@@ skipping 276 matching lines @@
   int ratio_h_;
   bool enable_camera_list_;
   bool square_pixel_aspect_ratio_;  // Enable scaling to square pixels.
   int scaled_width_;  // Current output size from ComputeScale.
   int scaled_height_;
 
   rtc::VideoBroadcaster broadcaster_;
   bool enable_video_adapter_;
   VideoAdapter video_adapter_;
 
+  // Same value as input_size_valid_ below, but different locking.

[perkj_webrtc, 2016/04/08 08:22:49]

?

[nisse-webrtc, 2016/04/08 09:15:43]

Both timestamp_offset_valid and input_size_valid have the same meaning: Have we
seen the first frame yet? But we can't really use a shared flag, because the
timestamp offset logic shouldn't touch the frame_stats_crit_ lock.

Anyway, this is moot if the logic is moved to the frame factory.

+  bool timestamp_offset_valid_ = false;
+  int64_t timestamp_offset_;
+
   rtc::CriticalSection frame_stats_crit_;
   // The captured frame size before potential adapation.
   bool input_size_valid_ GUARDED_BY(frame_stats_crit_) = false;
   int input_width_ GUARDED_BY(frame_stats_crit_);
   int input_height_ GUARDED_BY(frame_stats_crit_);
 
   // Whether capturer should apply rotation to the frame before signaling it.
   bool apply_rotation_;
 
   RTC_DISALLOW_COPY_AND_ASSIGN(VideoCapturer);
 };
 
 }  // namespace cricket
 
 #endif  // WEBRTC_MEDIA_BASE_VIDEOCAPTURER_H_