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

media/midi/midi_manager.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 MEDIA_MIDI_MIDI_MANAGER_H_
+#define MEDIA_MIDI_MIDI_MANAGER_H_
+
+#include "base/basictypes.h"
+#include "base/synchronization/lock.h"
+#include "media/base/media_export.h"
+#include <set>
+
+namespace media {
+
+// Manages access to all MIDI hardware.
+class MEDIA_EXPORT MIDIManager {
+ public:
+  static MIDIManager* Create();
+
+  MIDIManager();
+  virtual ~MIDIManager();
+
+  class Client {
+   public:
+     virtual ~Client() {}
+     virtual void ReceiveMIDIData(
+         int port_index,
+         const uint8* data,
+         size_t length,
+         double time_stamp) = 0;
+  };
+
+  void AddClient(Client* client);
+  void RemoveClient(Client* client);
+
+ protected:
+  // Dispatches to all clients.
+  void ReceiveMIDIData(
+      int port_index,
+      const uint8* data,
+      size_t length,
+      double time_stamp);
+
+  // Keeps track of all clients who wish to receive MIDI data.
+  typedef std::set<Client*> ClientList;
+  ClientList clients_;
+
+  // Protects access to our clients.
+  base::Lock clients_lock_;
+
+  DISALLOW_COPY_AND_ASSIGN(MIDIManager);
+};
+
+}  // namespace media
+
+#endif  // MEDIA_MIDI_MIDI_MANAGER_H_