Web MIDI API back-end (work-in-progress)

content/browser/renderer_host/media/midi_host.h

+// Copyright (c) 2013 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_BROWSER_RENDERER_HOST_MEDIA_MIDI_HOST_H_
+#define CONTENT_BROWSER_RENDERER_HOST_MEDIA_MIDI_HOST_H_
+
+#include "base/memory/ref_counted.h"
+#include "base/memory/scoped_ptr.h"
+#include "content/common/content_export.h"
+#include "content/public/browser/browser_message_filter.h"
+#include "content/public/browser/browser_thread.h"
+#include "media/midi/midi_manager.h"
+
+namespace media {
+class MIDIManager;
+}
+
+namespace content {
+
+class CONTENT_EXPORT MIDIHost : public BrowserMessageFilter,
+    public media::MIDIManager::Client {
+ public:
+  // Called from UI thread from the owner of this object.
+  MIDIHost(media::MIDIManager* midi_manager);
+
+  // BrowserMessageFilter implementation.
+  virtual void OnChannelClosing() OVERRIDE;
+  virtual void OnDestruct() const OVERRIDE;
+  virtual bool OnMessageReceived(const IPC::Message& message,
+                                 bool* message_was_ok) OVERRIDE;
+
+  // MIDIManager::Client
+  virtual void ReceiveMIDIData(

[scherkus (not reviewing), 2013/06/03 22:44:59]

note: called on high-priority audio thread

+      int port_index,
+      const uint8* data,
+      size_t length,
+      double timeStampSeconds) OVERRIDE;
+
+  // Play the audio stream referenced by |stream_id|.
+  void OnRequestAccess();
+
+ private:
+  friend class base::DeleteHelper<MIDIHost>;
+
+  friend class BrowserThread;
+
+  virtual ~MIDIHost();
+
+  // Methods called on IO thread ----------------------------------------------
+
+  // Audio related IPC message handlers.
+
+  media::MIDIManager* const midi_manager_;
+
+  DISALLOW_COPY_AND_ASSIGN(MIDIHost);
+};
+
+}  // namespace content
+
+#endif  // CONTENT_BROWSER_RENDERER_HOST_MEDIA_MIDI_HOST_H_