Load CMA backend from shared library

chromecast/media/cma/base/backend_client_callbacks.cc

Index: chromecast/media/cma/base/backend_client_callbacks.cc
diff --git a/chromecast/media/cma/base/backend_client_callbacks.cc b/chromecast/media/cma/base/backend_client_callbacks.cc
new file mode 100644
index 0000000000000000000000000000000000000000..bb4180e86e432b50052ee875b4db223a2566104a
--- /dev/null
+++ b/chromecast/media/cma/base/backend_client_callbacks.cc
@@ -0,0 +1,62 @@
+// 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/media/cma/base/backend_client_callbacks.h"
+
+#include "base/bind.h"
+#include "base/location.h"
+#include "base/single_thread_task_runner.h"
+#include "base/thread_task_runner_handle.h"
+#include "chromecast/public/graphics_types.h"
+
+namespace chromecast {
+namespace media {
+
+MediaComponentDeviceClientImpl::MediaComponentDeviceClientImpl(
+    const base::Closure& eos_cb)
+    : eos_cb_(eos_cb), task_runner_(base::ThreadTaskRunnerHandle::Get()) {}
+
+MediaComponentDeviceClientImpl::~MediaComponentDeviceClientImpl() {}
+
+void MediaComponentDeviceClientImpl::OnEndOfStream() {
+  if (!eos_cb_.is_null()) {

[servolk, 2015/07/27 21:25:47]

Strictly speaking you shouldn't be accessing eos_cb_ from a different thread. So
the null check has to be done once we are on the right thread, rather than
before that.

[halliwell, 2015/07/28 02:19:35]

Done.

+    if (task_runner_->BelongsToCurrentThread())
+      eos_cb_.Run();
+    else
+      task_runner_->PostTask(FROM_HERE, eos_cb_);
+  }
+}
+
+VideoPipelineDeviceClientImpl::VideoPipelineDeviceClientImpl(
+    const SizeChangeCB& size_change_cb)
+    : size_change_cb_(size_change_cb),
+      task_runner_(base::ThreadTaskRunnerHandle::Get()) {}
+
+VideoPipelineDeviceClientImpl::~VideoPipelineDeviceClientImpl() {}
+
+void VideoPipelineDeviceClientImpl::OnNaturalSizeChanged(const Size& size) {
+  if (!size_change_cb_.is_null()) {

[servolk, 2015/07/27 21:25:47]

ditto

[halliwell, 2015/07/28 02:19:35]

Done.

+    if (task_runner_->BelongsToCurrentThread())
+      size_change_cb_.Run(size);
+    else
+      task_runner_->PostTask(FROM_HERE, base::Bind(size_change_cb_, size));
+  }
+}
+
+FrameStatusCBImpl::FrameStatusCBImpl(const CallbackType& cb)
+    : cb_(cb), task_runner_(base::ThreadTaskRunnerHandle::Get()) {}
+
+FrameStatusCBImpl::~FrameStatusCBImpl() {}
+
+void FrameStatusCBImpl::Run(MediaComponentDevice::FrameStatus status) {
+  if (!cb_.is_null()) {

[servolk, 2015/07/27 21:25:47]

ditto

[halliwell, 2015/07/28 02:19:35]

Done.

+    if (task_runner_->BelongsToCurrentThread())
+      cb_.Run(status);
+    else
+      task_runner_->PostTask(FROM_HERE, base::Bind(cb_, status));
+  }
+}
+
+}  // namespace media
+}  // namespace chromecast