Decouple capture timestamp and reference time

content/renderer/media/video_capture_impl.h

 // 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.
 
 #ifndef CONTENT_RENDERER_MEDIA_VIDEO_CAPTURE_IMPL_H_
 #define CONTENT_RENDERER_MEDIA_VIDEO_CAPTURE_IMPL_H_
 
 #include <stdint.h>
 
 #include <list>
@@ skipping 102 matching lines @@
       BufferFinishedCallback;
 
   // VideoCaptureMessageFilter::Delegate interface.
   void OnBufferCreated(base::SharedMemoryHandle handle,
                        int length,
                        int buffer_id) override;
   void OnBufferCreated2(const std::vector<gfx::GpuMemoryBufferHandle>& handles,
                         const gfx::Size& size,
                         int buffer_id) override;
   void OnBufferDestroyed(int buffer_id) override;
-  void OnBufferReceived(
-      int buffer_id,
-      base::TimeTicks timestamp,
-      const base::DictionaryValue& metadata,
-      media::VideoPixelFormat pixel_format,
-      media::VideoFrame::StorageType storage_type,
-      const gfx::Size& coded_size,
-      const gfx::Rect& visible_rect) override;
+  void OnBufferReceived(int buffer_id,
+                        base::TimeDelta timestamp,
+                        const base::DictionaryValue& metadata,
+                        media::VideoPixelFormat pixel_format,
+                        media::VideoFrame::StorageType storage_type,
+                        const gfx::Size& coded_size,
+                        const gfx::Rect& visible_rect) override;
   void OnStateChanged(VideoCaptureState state) override;
   void OnDeviceSupportedFormatsEnumerated(
       const media::VideoCaptureFormats& supported_formats) override;
   void OnDeviceFormatsInUseReceived(
       const media::VideoCaptureFormats& formats_in_use) override;
   void OnDelegateAdded(int32_t device_id) override;
 
   // Sends an IPC message to browser process when all clients are done with the
   // buffer.
   void OnClientBufferFinished(int buffer_id,
@@ skipping 41 matching lines @@
   ClientBuffer2Map client_buffer2s_;
 
   ClientInfoMap clients_;
   ClientInfoMap clients_pending_on_filter_;
   ClientInfoMap clients_pending_on_restart_;
 
   // Member params_ represents the video format requested by the
   // client to this class via StartCapture().
   media::VideoCaptureParams params_;
 
-  // The device's first captured frame timestamp sent from browser process side.
-  base::TimeTicks first_frame_timestamp_;
+  // The device's first captured frame referecne time sent from browser process
+  // side.
+  base::TimeTicks first_frame_ref_time_;
 
   bool suspended_;
   VideoCaptureState state_;
 
   // IO message loop reference for checking correct class operation.
   scoped_refptr<base::SingleThreadTaskRunner> io_task_runner_;
 
   // WeakPtrFactory pointing back to |this| object, for use with
   // media::VideoFrames constructed in OnBufferReceived() from buffers cached
   // in |client_buffers_|.
   // NOTE: Weak pointers must be invalidated before all other member variables.
   base::WeakPtrFactory<VideoCaptureImpl> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(VideoCaptureImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_MEDIA_VIDEO_CAPTURE_IMPL_H_