Avoids invalid copy of audio buffer to task queue

webrtc/modules/audio_device/audio_device_buffer.h

 /*
  *  Copyright (c) 2012 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 68 matching lines @@
   // Called periodically on the internal thread created by the TaskQueue.
   void LogStats();
 
   // Clears all members tracking stats for recording and playout.
   void ResetRecStats();
   void ResetPlayStats();
 
   // Updates counters in each play/record callback but does it on the task
   // queue to ensure that they can be read by LogStats() without any locks since
   // each task is serialized by the task queue.
-  void UpdateRecStats(const void* audio_buffer, size_t num_samples);
-  void UpdatePlayStats(const void* audio_buffer, size_t num_samples);
+  void UpdateRecStats(int16_t max_abs, size_t num_samples);
+  void UpdatePlayStats(int16_t max_abs, size_t num_samples);
 
   // Ensures that methods are called on the same thread as the thread that
   // creates this object.
   rtc::ThreadChecker thread_checker_;
 
   // Raw pointer to AudioTransport instance. Supplied to RegisterAudioCallback()
   // and it must outlive this object.
   AudioTransport* audio_transport_cb_;
 
   // TODO(henrika): given usage of thread checker, it should be possible to
@@ skipping 94 matching lines @@
   // Contains max level of recorded audio packets over the last 10 seconds
   // where a new measurement is done twice per second.
   int16_t max_play_level_;
 
   // Counts number of times we detect "no audio" corresponding to a case where
   // all level measurements since the last log has been exactly zero.
   // In other words: this counter is incremented only if 20 measurements
   // (two per second) in a row equals zero. The member is only incremented on
   // the task queue and max once every 10th second.
   size_t num_rec_level_is_zero_;
+
+  // Counts number of audio callbacks modulo 50 to create a signal when
+  // a new storage of audio stats shall be done.
+  // Only updated on the OS-specific audio thread that drives audio.
+  int16_t rec_stat_count_;
+  int16_t play_stat_count_;
 };
 
 }  // namespace webrtc
 
 #endif  // WEBRTC_MODULES_AUDIO_DEVICE_AUDIO_DEVICE_BUFFER_H_