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

media/audio/audio_io.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_AUDIO_AUDIO_IO_H_
 #define MEDIA_AUDIO_AUDIO_IO_H_
 
 #include "base/basictypes.h"
 #include "media/base/audio_bus.h"
 
@@ skipping 45 matching lines @@
   // itself such as creating Windows or initializing COM.
   class MEDIA_EXPORT AudioSourceCallback {
    public:
     virtual ~AudioSourceCallback() {}
 
     // Provide more data by fully filling |dest|.  The source will return
     // the number of frames it filled.  |total_bytes_delay| contains current
     // number of bytes of delay buffered by the AudioOutputStream.
     virtual int OnMoreData(AudioBus* dest, uint32 total_bytes_delay) = 0;
 
+    // Informs that the consumer has skipped |frames_skipped| frames. The source

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

Why a new method instead of rolling this into OnMoreData() ?

[Henrik Grunell, 2015/12/03 17:01:06]

(See previous comment exchange.) Put this in OnMoreData().

+    // can handle this appropriately depending on the type of source. An
+    // ordinary file playout would ignore this.
+    // TODO BEFORE COMMIT: Pure virtual and update subclasses.
+    virtual void OnSkippedData(uint32_t frames_skipped){};
+
     // There was an error while playing a buffer. Audio source cannot be
     // destroyed yet. No direct action needed by the AudioStream, but it is
     // a good place to stop accumulating sound data since is is likely that
     // playback will not continue.
     virtual void OnError(AudioOutputStream* stream) = 0;
   };
 
   virtual ~AudioOutputStream() {}
 
   // Open the stream. false is returned if the stream cannot be opened.  Open()
@@ skipping 88 matching lines @@
   // Returns the Automatic Gain Control (AGC) state.
   virtual bool GetAutomaticGainControl() = 0;
 
   // Returns the current muting state for the microphone.
   virtual bool IsMuted() = 0;
 };
 
 }  // namespace media
 
 #endif  // MEDIA_AUDIO_AUDIO_IO_H_