Load CMA backend from shared library

chromecast/media/cma/backend/media_pipeline_device.h

-// 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.
-
-#ifndef CHROMECAST_MEDIA_CMA_BACKEND_MEDIA_PIPELINE_DEVICE_H_
-#define CHROMECAST_MEDIA_CMA_BACKEND_MEDIA_PIPELINE_DEVICE_H_
-
-#include "base/callback.h"
-#include "base/macros.h"
-#include "base/memory/scoped_ptr.h"
-
-namespace chromecast {
-namespace media {
-class AudioPipelineDevice;
-class MediaClockDevice;
-class MediaPipelineDeviceFactory;
-class MediaPipelineDeviceParams;
-class VideoPipelineDevice;
-
-// MediaPipelineDevice is the owner of the underlying audio/video/clock
-// devices.  It ensures that the clock outlives the audio and video devices, so
-// it is safe for them to reference the clock with a raw pointer.
-class MediaPipelineDevice {
- public:
-  // Constructs object using clock, audio, video created by given factory.
-  explicit MediaPipelineDevice(scoped_ptr<MediaPipelineDeviceFactory> factory);
-
-  // Constructs explicitly from separate clock, audio, video elements
-  MediaPipelineDevice(scoped_ptr<MediaClockDevice> media_clock_device,
-                      scoped_ptr<AudioPipelineDevice> audio_pipeline_device,
-                      scoped_ptr<VideoPipelineDevice> video_pipeline_device);
-  ~MediaPipelineDevice();
-
-  AudioPipelineDevice* GetAudioPipelineDevice() const {
-    return audio_pipeline_device_.get();
-  }
-  VideoPipelineDevice* GetVideoPipelineDevice() const {
-    return video_pipeline_device_.get();
-  }
-  MediaClockDevice* GetMediaClockDevice() const {
-    return media_clock_device_.get();
-  }
-
- private:
-  scoped_ptr<MediaClockDevice> media_clock_device_;
-  scoped_ptr<AudioPipelineDevice> audio_pipeline_device_;
-  scoped_ptr<VideoPipelineDevice> video_pipeline_device_;
-
-  DISALLOW_COPY_AND_ASSIGN(MediaPipelineDevice);
-};
-
-// Factory method to create a MediaPipelineDevice.
-typedef base::Callback<scoped_ptr<MediaPipelineDevice>(
-    const MediaPipelineDeviceParams&)> CreatePipelineDeviceCB;
-
-}  // namespace media
-}  // namespace chromecast
-
-#endif  // CHROMECAST_MEDIA_CMA_BACKEND_MEDIA_PIPELINE_DEVICE_H_