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, cast::CastResource::kResourceNone);
+}
+
+void CmaMediaPipelineClient::ReleaseResource(
+    cast::CastResource::Resource resource) {
+  if (!(resource & cast::CastResource::kResourceScreenPrimary)) {

[gunsch, 2015/09/01 22:56:08]

What threads are these called on?

Should OnResourceReleased be callable from any thread?

[yucliu1, 2015/09/01 23:42:13]

Yes, OnResourceReleased can be called from any thread.

+    if (client_)
+      client_->OnResourceReleased(this,
+                                  cast::CastResource::kResourceScreenPrimary);

[halliwell, 2015/09/01 19:42:23]

I actually think this is incorrect and we need to change the set of resource
types?  We already use kResourceScreenPrimary for the GPU relinquish flow.  I
think we need a different type for CMA backend ... MediaDecoder?  Or Media if we
want something more generic?

+  }
+}
+
+void CmaMediaPipelineClient::SetCastResourceClient(
+    cast::CastResource::Client* client) {
+  client_ = client;
+}
+
+}  // namespace media
+}  // namespace chromecast