Chromecast: wires up renderer-side CMA message filter.

chromecast/renderer/cast_render_process_observer.cc

+// 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.
+
+#include "chromecast/renderer/cast_render_process_observer.h"
+
+#include "chromecast/renderer/media/cma_message_filter_proxy.h"
+#include "content/public/renderer/render_thread.h"
+
+namespace chromecast {
+namespace shell {
+
+CastRenderProcessObserver::CastRenderProcessObserver() {
+  content::RenderThread* thread = content::RenderThread::Get();
+  thread->AddObserver(this);
+  CreateCustomFilters();
+}
+
+CastRenderProcessObserver::~CastRenderProcessObserver() {
+  // CastRenderProcessObserver outlives content::RenderThread.
+  // No need to explicitly call RemoveObserver in teardown.
+}
+
+void CastRenderProcessObserver::CreateCustomFilters() {
+#if !defined(OS_ANDROID)
+  content::RenderThread* thread = content::RenderThread::Get();
+  cma_message_filter_proxy_ =
+      new media::CmaMessageFilterProxy(thread->GetIOMessageLoopProxy());
+  thread->AddFilter(cma_message_filter_proxy_.get());
+#endif  // !defined(OS_ANDROID)
+}
+
+void CastRenderProcessObserver::OnRenderProcessShutdown() {
+#if !defined(OS_ANDROID)
+  content::RenderThread* thread = content::RenderThread::Get();
+  if (cma_message_filter_proxy_.get()) {
+    thread->RemoveFilter(cma_message_filter_proxy_.get());
+    cma_message_filter_proxy_ = NULL;
+  }
+#endif  // !defined(OS_ANDROID)
+}
+
+}  // namespace shell
+}  // namespace chromecast