Forward the number of skipped frames by the OS in audio playout.

media/base/audio_renderer_sink.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_RENDERER_SINK_H_
 #define MEDIA_BASE_AUDIO_RENDERER_SINK_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 23 matching lines @@
  public:
   class RenderCallback {
    public:
     // Attempts to completely fill all channels of |dest|, returns actual
     // number of frames filled.
     virtual int Render(AudioBus* dest, int audio_delay_milliseconds) = 0;
 
     // Signals an error has occurred.
     virtual void OnRenderError() = 0;
 
+    // Signals that the consumer has skipped frames in playout.

[DaleCurtis, 2015/12/01 18:12:46]

Why a new method instead of rolling this into the Render() call?

[Henrik Grunell, 2015/12/03 17:01:07]

I had some reason that I don't recall or can figure out now. Changed.

+    // TODO BEFORE COMMIT: Pure virtual.
+    virtual void OnFramesSkipped(uint32_t frames_skipped){};
+
    protected:
     virtual ~RenderCallback() {}
   };
 
   // Sets important information about the audio stream format.
   // It must be called before any of the other methods.
   virtual void Initialize(const AudioParameters& params,
                           RenderCallback* callback) = 0;
 
   // Starts audio playback.
@@ skipping 31 matching lines @@
 // this.
 
 class RestartableAudioRendererSink : public AudioRendererSink {
  protected:
   ~RestartableAudioRendererSink() override {}
 };
 
 }  // namespace media
 
 #endif  // MEDIA_BASE_AUDIO_RENDERER_SINK_H_