Chromecast: adds interfaces for hardware layer of CMA pipeline.

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 media {
+class VideoDecoderConfig;
+}
+
+namespace chromecast {
+namespace media {
+class DecoderBufferBase;
+
+// 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();
+  virtual ~VideoPipelineDevice();
+
+  // 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 ::media::VideoDecoderConfig& config) = 0;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(VideoPipelineDevice);
+};
+
+}  // namespace media
+}  // namespace chromecast
+
+#endif  // CHROMECAST_MEDIA_CMA_BACKEND_VIDEO_PIPELINE_DEVICE_H_