Detect errors in audio output and report them upstream.

media/base/audio_renderer_sink.h

 // Copyright (c) 2011 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 <vector>
 #include "base/basictypes.h"
 #include "base/memory/ref_counted.h"
@@ skipping 14 matching lines @@
    public:
     // Fills entire buffer of length |number_of_frames| but returns actual
     // number of frames it got from its source (|number_of_frames| in case of
     // continuous stream). That actual number of frames is passed to host
     // together with PCM audio data and host is free to use or ignore it.
     // TODO(crogers): use base:Callback instead.
     virtual size_t Render(const std::vector<float*>& audio_data,
                           size_t number_of_frames,
                           size_t audio_delay_milliseconds) = 0;
 
+    // Signals an error has occurred.
+    virtual void OnError() = 0;
+
    protected:
     virtual ~RenderCallback() {}
   };
 
   virtual ~AudioRendererSink() {}
 
   // Sets important information about the audio stream format.
   // It must be called before any of the other methods.
   virtual void Initialize(size_t buffer_size,
                           int channels,
@@ skipping 17 matching lines @@
   // Returns |true| on success.
   virtual bool SetVolume(double volume) = 0;
 
   // Gets the playback volume, with range [0.0, 1.0] inclusive.
   virtual void GetVolume(double* volume) = 0;
 };
 
 }  // namespace media
 
 #endif  // MEDIA_BASE_AUDIO_RENDERER_SINK_H_