Very early implementation for HTMLMediaElement / Web Audio API integration

content/renderer/renderer_webaudiosourceprovider_impl.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 CONTENT_RENDERER_RENDERER_WEBAUDIOSOURCEPROVIDER_IMPL_H_
+#define CONTENT_RENDERER_RENDERER_WEBAUDIOSOURCEPROVIDER_IMPL_H_
+
+#include <vector>
+
+#include "base/memory/ref_counted.h"
+#include "content/renderer/media/audio_device.h"
+#include "third_party/WebKit/Source/WebKit/chromium/public/WebAudioSourceProvider.h"
+#include "third_party/WebKit/Source/WebKit/chromium/public/WebVector.h"
+
+class RendererWebAudioSourceProviderImpl : public WebKit::WebAudioSourceProvider,

[scherkus (not reviewing), 2011/08/23 15:16:01]

naming nit... similar to how WebViewClient -> RenderView, what about cutting
down on the Webs and Impls and going with RenderAudioSourceProvider?

[scherkus (not reviewing), 2011/08/23 15:16:01]

docs for this class

[Chris Rogers, 2011/08/24 00:41:52]

Ok, sounds good.  I've renamed this class to RenderAudioSourceProvider as you
suggest...

On 2011/08/23 15:16:01, scherkus wrote:

[Chris Rogers, 2011/08/24 00:41:52]

I've added some comments here.  I can add more detail as necessary...

On 2011/08/23 15:16:01, scherkus wrote:

+                                           public AudioSink {
+ public:
+  RendererWebAudioSourceProviderImpl(AudioSink::RenderCallback* callback);
+  virtual ~RendererWebAudioSourceProviderImpl() { }
+
+  // WebKit::WebAudioSourceProvider implementation.
+  // WebKit calls this to get the rendered audio stream.
+  virtual void provideInput(const WebKit::WebVector<float*>& audio_data,
+                            size_t number_of_frames);
+
+  // AudioSink implementation.
+  virtual bool Start();
+  virtual bool Stop();
+  virtual bool SetVolume(double volume);
+
+ private:
+  bool is_running_;
+  double volume_;
+  AudioSink::RenderCallback* callback_;
+  
+  DISALLOW_COPY_AND_ASSIGN(RendererWebAudioSourceProviderImpl);
+};
+
+#endif  // CONTENT_RENDERER_RENDERER_WEBAUDIOSOURCEPROVIDER_IMPL_H_