Use microsecond timestamp in cricket::VideoFrame.

webrtc/media/engine/webrtcvideoframe.h

 /*
  *  Copyright (c) 2011 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.
  */
 
 #ifndef WEBRTC_MEDIA_ENGINE_WEBRTCVIDEOFRAME_H_
 #define WEBRTC_MEDIA_ENGINE_WEBRTCVIDEOFRAME_H_
 
 #include <memory>
 
 #include "webrtc/base/buffer.h"
 #include "webrtc/base/refcount.h"
 #include "webrtc/base/scoped_ref_ptr.h"
 #include "webrtc/common_types.h"
 #include "webrtc/common_video/include/video_frame_buffer.h"
 #include "webrtc/media/base/videoframe.h"
 
 namespace cricket {
 
 struct CapturedFrame;
 
 class WebRtcVideoFrame : public VideoFrame {
  public:
   WebRtcVideoFrame();
+
+  // Preferred construction, with microsecond timestamp.
+  WebRtcVideoFrame(const rtc::scoped_refptr<webrtc::VideoFrameBuffer>& buffer,
+                   webrtc::VideoRotation rotation,
+                   int64_t timestamp_us);
+
+  // TODO(nisse): Deprecate/delete.
   WebRtcVideoFrame(const rtc::scoped_refptr<webrtc::VideoFrameBuffer>& buffer,
                    int64_t time_stamp_ns,
                    webrtc::VideoRotation rotation);
 
   ~WebRtcVideoFrame();
 
   // Creates a frame from a raw sample with FourCC "format" and size "w" x "h".
   // "h" can be negative indicating a vertically flipped image.
   // "dh" is destination height if cropping is desired and is always positive.
   // Returns "true" if successful.
   bool Init(uint32_t format,
             int w,
             int h,
             int dw,
             int dh,
             uint8_t* sample,
             size_t sample_size,
             int64_t time_stamp_ns,
             webrtc::VideoRotation rotation);
 
+  // The timestamp of the captured frame is expected to use the same
+  // timescale and epoch as rtc::Time.
+  // TODO(nisse): Consider adding a warning message, or even an RTC_DCHECK, if
+  // the time is too far off.
   bool Init(const CapturedFrame* frame, int dw, int dh, bool apply_rotation);
 
+  void InitToEmptyBuffer(int w, int h);
   void InitToEmptyBuffer(int w, int h, int64_t time_stamp_ns);
 
   bool InitToBlack(int w, int h, int64_t time_stamp_ns);
 
   int width() const override;
   int height() const override;
 
   const uint8_t* GetYPlane() const override;
   const uint8_t* GetUPlane() const override;
   const uint8_t* GetVPlane() const override;
   uint8_t* GetYPlane() override;
   uint8_t* GetUPlane() override;
   uint8_t* GetVPlane() override;
   int32_t GetYPitch() const override;
   int32_t GetUPitch() const override;
   int32_t GetVPitch() const override;
   void* GetNativeHandle() const override;
   rtc::scoped_refptr<webrtc::VideoFrameBuffer> video_frame_buffer()
       const override;
 
-  int64_t GetTimeStamp() const override { return time_stamp_ns_; }
-  void SetTimeStamp(int64_t time_stamp_ns) override {
-    time_stamp_ns_ = time_stamp_ns;
-  }
+  /* System monotonic clock */
+  int64_t timestamp_us() const override { return timestamp_us_; }
+  void set_timestamp_us(int64_t time_us) override { timestamp_us_ = time_us; };
 
   webrtc::VideoRotation rotation() const override { return rotation_; }
 
   VideoFrame* Copy() const override;
   bool IsExclusive() const override;
   size_t ConvertToRgbBuffer(uint32_t to_fourcc,
                             uint8_t* buffer,
                             size_t size,
                             int stride_rgb) const override;
 
   const VideoFrame* GetCopyWithRotationApplied() const override;
 
  protected:
   void set_rotation(webrtc::VideoRotation rotation) override {
     rotation_ = rotation;
   }
   // Creates a frame from a raw sample with FourCC |format| and size |w| x |h|.
   // |h| can be negative indicating a vertically flipped image.
   // |dw| is destination width; can be less than |w| if cropping is desired.
   // |dh| is destination height, like |dw|, but must be a positive number.
   // Returns whether the function succeeded or failed.
   bool Reset(uint32_t format,
-                     int w,
-                     int h,
-                     int dw,
-                     int dh,
-                     uint8_t* sample,
-                     size_t sample_size,
-                     int64_t time_stamp_ns,
-                     webrtc::VideoRotation rotation,
-                     bool apply_rotation);
+             int w,
+             int h,
+             int dw,
+             int dh,
+             uint8_t* sample,
+             size_t sample_size,
+             int64_t timestamp_us,
+             webrtc::VideoRotation rotation,
+             bool apply_rotation);
 
  private:
   VideoFrame* CreateEmptyFrame(int w, int h,
                                int64_t time_stamp_ns) const override;
 
   // An opaque reference counted handle that stores the pixel data.
   rtc::scoped_refptr<webrtc::VideoFrameBuffer> video_frame_buffer_;
-  int64_t time_stamp_ns_;
+  int64_t timestamp_us_;
   webrtc::VideoRotation rotation_;
 
   // This is mutable as the calculation is expensive but once calculated, it
   // remains const.
   mutable std::unique_ptr<VideoFrame> rotated_frame_;
 };
 
 }  // namespace cricket
 
 #endif  // WEBRTC_MEDIA_ENGINE_WEBRTCVIDEOFRAME_H_