CmaMediaPipelineClient to watch media pipeline status

chromecast/base/cast_resource.h

+// Copyright 2015 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_BASE_CAST_RESOURCE_H_
+#define CHROMECAST_BASE_CAST_RESOURCE_H_
+
+namespace chromecast {
+
+// Interface for resources needed to run application.
+class CastResource {
+ public:
+  // Resources necessary to run cast apps.
+  enum Resource {
+    kResourceNone = 0,
+    // All resources necessary to render sounds, for example, audio pipeline,
+    // speaker, etc.
+    kResourceAudio = 1 << 0,
+    // All resources necessary to render videos or images, for example, video
+    // pipeline, primary graphics plane, display, etc.
+    kResourceScreenPrimary = 1 << 1,
+    // All resources necessary to render overlaid images, for example, secondary
+    // graphics plane, LCD, etc.
+    kResourceScreenSecondary = 1 << 2,
+    // Collection of resources used for display only combined with bitwise or.
+    kResourceDisplayOnly = (kResourceScreenPrimary | kResourceScreenSecondary),
+    // Collection of all resources combined with bitwise or.
+    kResourceAll = (kResourceAudio | kResourceScreenPrimary
+                    | kResourceScreenSecondary),
+  };
+
+  class Client {
+   public:
+    virtual void OnResourceAcquired(CastResource* cast_resource) = 0;
+    virtual void OnResourceReleased(CastResource* cast_resource) = 0;

[halliwell, 2015/09/01 15:24:05]

add virtual dtor, hide dtor as well?

[yucliu1, 2015/09/01 18:41:33]

Done.

+  };
+
+  virtual ~CastResource() {}
+
+  // Called to release resources. Implementation should call
+  // Client::OnResourceReleased when resource is released on its side.
+  virtual void ReleaseResource(Resource resource) = 0;
+  virtual void SetCastResourceClient(Client* client) = 0;
+};
+
+} // namespace chromecast
+
+#endif