Interpolate media time for mojo rendering pipeline.

media/base/time_delta_interpolator.h

 // Copyright 2014 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 MEDIA_BASE_TIME_DELTA_INTERPOLATOR_H_
 #define MEDIA_BASE_TIME_DELTA_INTERPOLATOR_H_
 
 #include "base/macros.h"
 #include "base/time/time.h"
 #include "media/base/media_export.h"
@@ skipping 31 matching lines @@
   // Sets a new rate at which to interpolate.
   //
   // |tick_clock| will be queried for a new reference time value.
   void SetPlaybackRate(double playback_rate);
 
   // Sets the two timestamps to interpolate between at |playback_rate_|.
   // |upper_bound| must be greater or equal to |lower_bound|.
   //
   // |upper_bound| is typically the media timestamp of the last audio frame
   // buffered by the audio hardware.
-  void SetBounds(base::TimeDelta lower_bound, base::TimeDelta upper_bound);
+  void SetBounds(base::TimeDelta lower_bound,
+                 base::TimeDelta upper_bound,
+                 base::TimeTicks capture_time);

[alokp, 2016/09/02 22:51:17]

Added to avoid calling TimeTicks::Now multiple times and introducing
imprecision.

 
   // Sets the upper bound used for interpolation. Note that if |upper_bound| is
   // less than what was previously set via SetTime(), then all future calls
   // to GetInterpolatedTime() will return |upper_bound|.
   void SetUpperBound(base::TimeDelta upper_bound);
 
   // Computes an interpolated time based on SetTime().
   base::TimeDelta GetInterpolatedTime();
 
  private:
@@ skipping 10 matching lines @@
   base::TimeTicks reference_;
 
   double playback_rate_;
 
   DISALLOW_COPY_AND_ASSIGN(TimeDeltaInterpolator);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_BASE_TIME_DELTA_INTERPOLATOR_H_