CmaMediaPipelineClient to watch media pipeline status

chromecast/browser/media/cma_media_pipeline_client.cc

+// 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.
+
+#include "chromecast/browser/media/cma_media_pipeline_client.h"
+#include "chromecast/public/cast_media_shlib.h"
+
+namespace chromecast {
+namespace media {
+
+CmaMediaPipelineClient::CmaMediaPipelineClient() : client_(nullptr) {}
+
+CmaMediaPipelineClient::~CmaMediaPipelineClient() {}
+
+scoped_ptr<MediaPipelineBackend>
+CmaMediaPipelineClient::CreateMediaPipelineBackend(
+    const media::MediaPipelineDeviceParams& params) {
+  return make_scoped_ptr(CastMediaShlib::CreateMediaPipelineBackend(params));
+}
+
+void CmaMediaPipelineClient::OnMediaPipelineBackendCreated() {
+  if (client_)
+    client_->OnResourceAcquired(this);
+}
+
+void CmaMediaPipelineClient::OnMediaPipelineBackendDestroyed() {
+  if (client_)
+    client_->OnResourceReleased(this, CastResource::kResourceNone);
+}
+
+void CmaMediaPipelineClient::ReleaseResource(CastResource::Resource resource) {
+  CastResource::Resource audio_video_resource =
+      static_cast<CastResource::Resource>(CastResource::kResourceAudio |
+                                          CastResource::kResourceScreenPrimary);
+
+  // TODO(yucliu): media pipeline need to stop audio video seperately
+  if (!(resource & audio_video_resource)) {
+    if (client_)
+      client_->OnResourceReleased(this, audio_video_resource);
+  }
+}
+
+void CmaMediaPipelineClient::SetCastResourceClient(
+    CastResource::Client* client) {
+  client_ = client;
+}
+
+}  // namespace media
+}  // namespace chromecast