Chromecast: adds interfaces for hardware layer of CMA pipeline.

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/macros.h"
+#include "base/memory/scoped_ptr.h"
+
+namespace chromecast {
+namespace media {
+class AudioPipelineDevice;
+class MediaClockDevice;
+class VideoPipelineDevice;
+
+// MediaPipelineDevice is the owner of the underlying audio/video/clock
+// devices.
+class MediaPipelineDevice {
+ public:
+  struct CreateParameters {

[damienv1, 2014/10/03 22:19:42]

I would rather have sth like: MediaPipelineDeviceParams (a bit in the same way
there is a WebMediaPlayerParams) and move it outside of the MediaPipelineDevice
class so forward declaration can be possible.

[gunsch, 2014/10/03 23:08:44]

Done.

+    CreateParameters();
+    ~CreateParameters();
+
+    // When set to true, synchronization is disabled and audio/video frames are
+    // rendered "right away":
+    // - for audio, frames are still rendered based on the sampling frequency
+    // - for video, frames are rendered as soon as available at the output of
+    //   the video decoder.
+    //   The assumption is that no B frames are used when synchronization is
+    //   disabled, otherwise B frames would always be skipped.
+    bool disable_synchronization;
+  };
+
+  MediaPipelineDevice();
+  virtual ~MediaPipelineDevice();
+
+  virtual AudioPipelineDevice* GetAudioPipelineDevice() const = 0;
+
+  virtual VideoPipelineDevice* GetVideoPipelineDevice() const = 0;
+
+  virtual MediaClockDevice* GetMediaClockDevice() const = 0;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(MediaPipelineDevice);
+};
+
+// Factory to create a MediaPipelineDevice.
+scoped_ptr<MediaPipelineDevice> CreateMediaPipelineDevice(
+    const MediaPipelineDevice::CreateParameters& params);
+
+}  // namespace media
+}  // namespace chromecast
+
+#endif  // CHROMECAST_MEDIA_CMA_BACKEND_MEDIA_PIPELINE_DEVICE_H_