Load CMA backend from shared library

chromecast/browser/media/media_pipeline_host.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_BROWSER_MEDIA_MEDIA_PIPELINE_HOST_H_
 #define CHROMECAST_BROWSER_MEDIA_MEDIA_PIPELINE_HOST_H_
 
 #include <map>
 
 #include "base/callback.h"
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/threading/thread_checker.h"
 #include "base/time/time.h"
 #include "chromecast/common/media/cma_ipc_common.h"
-#include "chromecast/media/cma/backend/media_pipeline_device.h"
 #include "chromecast/media/cma/pipeline/load_type.h"
 #include "media/base/pipeline_status.h"
 
 namespace base {
 class SharedMemory;
-class SingleThreadTaskRunner;
 }
 
 namespace media {
 class AudioDecoderConfig;
 class VideoDecoderConfig;
 }
 
 namespace chromecast {
+class TaskRunnerImpl;
+
 namespace media {
 struct AvPipelineClient;
 class BrowserCdmCast;
+class MediaPipelineBackend;
 struct MediaPipelineClient;
+struct MediaPipelineDeviceParams;
 class MediaPipelineImpl;
 struct VideoPipelineClient;
 
 class MediaPipelineHost {
  public:
+  // Factory method to create a MediaPipelineBackend
+  typedef base::Callback<scoped_ptr<media::MediaPipelineBackend>(
+      const MediaPipelineDeviceParams&)> CreateDeviceComponentsCB;
+
   MediaPipelineHost();
   ~MediaPipelineHost();
 
-  void Initialize(
-      LoadType load_type,
-      const MediaPipelineClient& client,
-      const media::CreatePipelineDeviceCB& create_pipeline_device_cb);
+  void Initialize(LoadType load_type,
+                  const MediaPipelineClient& client,
+                  const CreateDeviceComponentsCB& create_device_components_cb);
 
   void SetAvPipe(TrackId track_id,
                  scoped_ptr<base::SharedMemory> shared_mem,
                  const base::Closure& pipe_read_activity_cb,
                  const base::Closure& av_pipe_set_cb);
   void AudioInitialize(TrackId track_id,
                        const AvPipelineClient& client,
                        const ::media::AudioDecoderConfig& config,
                        const ::media::PipelineStatusCB& status_cb);
   void VideoInitialize(TrackId track_id,
                        const VideoPipelineClient& client,
                        const std::vector<::media::VideoDecoderConfig>& configs,
                        const ::media::PipelineStatusCB& status_cb);
   void StartPlayingFrom(base::TimeDelta time);
   void Flush(const ::media::PipelineStatusCB& status_cb);
   void Stop();
 
   void SetPlaybackRate(double playback_rate);
   void SetVolume(TrackId track_id, float playback_rate);
   void SetCdm(BrowserCdmCast* cdm);
 
   void NotifyPipeWrite(TrackId track_id);
 
  private:
   base::ThreadChecker thread_checker_;
 
+  scoped_ptr<TaskRunnerImpl> task_runner_;
   scoped_ptr<MediaPipelineImpl> media_pipeline_;
 
   // The shared memory for a track id must be valid until Stop is invoked on
   // that track id.
   struct MediaTrackHost;
   typedef std::map<TrackId, MediaTrackHost*> MediaTrackMap;
   MediaTrackMap media_track_map_;
 
   DISALLOW_COPY_AND_ASSIGN(MediaPipelineHost);
 };
 
 }  // namespace media
 }  // namespace chromecast
 
 #endif  // CHROMECAST_BROWSER_MEDIA_MEDIA_PIPELINE_HOST_H_