Load CMA backend from shared library

chromecast/media/cma/pipeline/video_pipeline_device_client_impl.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_MEDIA_CMA_PIPELINE_VIDEO_PIPELINE_DEVICE_CLIENT_IMPL_H_
+#define CHROMECAST_MEDIA_CMA_PIPELINE_VIDEO_PIPELINE_DEVICE_CLIENT_IMPL_H_
+
+#include "base/callback.h"
+#include "base/memory/ref_counted.h"
+#include "chromecast/public/media/media_component_device.h"
+#include "chromecast/public/media/video_pipeline_device.h"
+
+namespace base {
+class SingleThreadTaskRunner;
+}
+
+namespace chromecast {
+namespace media {
+
+// Helper for implementing VideoPipelineDevice::VideoClient with
+// a base::Callback.
+class VideoPipelineDeviceClientImpl : public VideoPipelineDevice::VideoClient {
+ public:
+  typedef base::Callback<void(const Size&)> SizeChangeCB;
+
+  VideoPipelineDeviceClientImpl(const SizeChangeCB& size_change_cb);
+  ~VideoPipelineDeviceClientImpl() override;
+
+  void OnNaturalSizeChanged(const Size& size) override;
+
+ private:
+  SizeChangeCB size_change_cb_;
+  scoped_refptr<base::SingleThreadTaskRunner> task_runner_;
+};
+
+}  // namespace media
+}  // namespace chromecast
+
+#endif  // CHROMECAST_MEDIA_CMA_PIPELINE_VIDEO_PIPELINE_DEVICE_CLIENT_IMPL_H_