Pass delay and timestamp to AudioSourceCallback::OnMoreData.

media/base/audio_timestamp_helper.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 MEDIA_BASE_AUDIO_TIMESTAMP_HELPER_H_
 #define MEDIA_BASE_AUDIO_TIMESTAMP_HELPER_H_
 
 #include <stdint.h>
 
 #include "base/macros.h"
@@ skipping 12 matching lines @@
 // constructed, SetBaseTimestamp() must be called to specify the starting
 // timestamp of the audio sequence. As audio samples are received, their frame
 // counts are added using AddFrames(). These frame counts are accumulated by
 // this class so GetTimestamp() can be used to determine the timestamp for the
 // samples that have been added. GetDuration() calculates the proper duration
 // values for samples added to the current timestamp. GetFramesToTarget()
 // determines the number of frames that need to be added/removed from the
 // accumulated frames to reach a target timestamp.
 class MEDIA_EXPORT AudioTimestampHelper {
  public:
+  // Returns the time duration of the given number of frames of audio with the
+  // given sample rate (in samples per second).
+  static base::TimeDelta FramesToTime(int64_t frames, int samples_per_second);
+
+  // Returns the number of frames in the given duration of audio with the given
+  // sample rate (in samples per second).
+  static int64_t TimeToFrames(base::TimeDelta time, int samples_per_second);
+
   explicit AudioTimestampHelper(int samples_per_second);
 
   // Sets the base timestamp to |base_timestamp| and the sets count to 0.
   void SetBaseTimestamp(base::TimeDelta base_timestamp);
 
   base::TimeDelta base_timestamp() const;
   int64_t frame_count() const { return frame_count_; }
 
   // Adds |frame_count| to the frame counter.
   // Note: SetBaseTimestamp() must be called with a value other than
@@ skipping 23 matching lines @@
 
   // Number of frames accumulated by AddFrames() calls.
   int64_t frame_count_;
 
   DISALLOW_IMPLICIT_CONSTRUCTORS(AudioTimestampHelper);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_BASE_AUDIO_TIMESTAMP_HELPER_H_