[Chromecast] Add CmaMediaRendererFactory and IPC proxy components

chromecast/renderer/media/media_channel_proxy.h

+// Copyright 2014 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 CHROMECAST_RENDERER_MEDIA_MEDIA_CHANNEL_PROXY_H_
+#define CHROMECAST_RENDERER_MEDIA_MEDIA_CHANNEL_PROXY_H_
+
+#include "base/macros.h"
+#include "base/memory/ref_counted.h"
+#include "base/memory/scoped_ptr.h"
+#include "chromecast/media/cma/pipeline/load_type.h"
+#include "chromecast/renderer/media/cma_message_filter_proxy.h"
+
+namespace IPC {
+class Message;
+}
+
+namespace chromecast {
+namespace media {
+
+// MediaChannelProxy - Manage the lifetime of a CMA ipc channel.
+// Must be invoked from the IO thread of the renderer process.
+class MediaChannelProxy
+    : public base::RefCountedThreadSafe<MediaChannelProxy> {
+ public:
+  MediaChannelProxy();
+
+  // Opens a CMA ipc channel.
+  void Open(LoadType load_type);
+
+  // Closes the ipc channel.
+  void Close();
+
+  // Returns the ID of the CMA ipc channel.
+  // Returns 0 or negative ID if no channel has been opened.
+  int GetId() { return id_; }
+
+  // Manages delegates.
+  bool SetMediaDelegate(
+      const CmaMessageFilterProxy::MediaDelegate& media_delegate);
+  bool SetAudioDelegate(
+      const CmaMessageFilterProxy::AudioDelegate& audio_delegate);
+  bool SetVideoDelegate(
+      const CmaMessageFilterProxy::VideoDelegate& video_delegate);
+
+  // Sends an IPC message over this CMA ipc channel.
+  bool Send(scoped_ptr<IPC::Message> message);
+
+ private:
+  friend class base::RefCountedThreadSafe<MediaChannelProxy>;
+  virtual ~MediaChannelProxy();
+
+  // Message filter running on the renderer side.
+  scoped_refptr<CmaMessageFilterProxy> filter_;
+
+  // Indicates whether the CMA channel is open.
+  bool is_open_;
+
+  // Unique identifier per media pipeline.
+  int id_;
+
+  DISALLOW_COPY_AND_ASSIGN(MediaChannelProxy);
+};
+
+}  // namespace media
+}  // namespace chromecast
+
+#endif  // CHROMECAST_RENDERER_MEDIA_MEDIA_CHANNEL_PROXY_H_