Load CMA backend from shared library

chromecast/media/cma/backend/video_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_VIDEO_PIPELINE_DEVICE_H_
-#define CHROMECAST_MEDIA_CMA_BACKEND_VIDEO_PIPELINE_DEVICE_H_
-
-#include "base/callback.h"
-#include "base/macros.h"
-#include "chromecast/media/cma/backend/media_component_device.h"
-
-namespace gfx {
-class Size;
-}
-
-namespace chromecast {
-namespace media {
-class DecoderBufferBase;
-struct VideoConfig;
-
-// VideoPipelineDevice -
-//
-// Notes:
-// - Like a regular MediaComponentDevice, frames are possibly rendered only
-//   in the kRunning state.
-//   However, the first frame must be rendered regardless of the clock state:
-//   - no synchronization needed to display the first frame,
-//   - the clock rate has no impact on the presentation of the first frame.
-//
-class VideoPipelineDevice : public MediaComponentDevice {
- public:
-  struct VideoClient {
-    VideoClient();
-    ~VideoClient();
-
-    // Invoked each time the natural size is updated.
-    base::Callback<void(const gfx::Size& natural_size)>
-        natural_size_changed_cb;
-  };
-
-  VideoPipelineDevice();
-  ~VideoPipelineDevice() override;
-
-  // Registers |client| as the video specific event handler.
-  virtual void SetVideoClient(const VideoClient& client) = 0;
-
-  // Provide the video configuration.
-  // Must be called before switching from |kStateUninitialized| to |kStateIdle|.
-  // Afterwards, this can be invoked any time the configuration changes.
-  // Returns true if the configuration is a supported configuration.
-  virtual bool SetConfig(const VideoConfig& config) = 0;
-
- private:
-  DISALLOW_COPY_AND_ASSIGN(VideoPipelineDevice);
-};
-
-}  // namespace media
-}  // namespace chromecast
-
-#endif  // CHROMECAST_MEDIA_CMA_BACKEND_VIDEO_PIPELINE_DEVICE_H_