Load CMA backend from shared library

chromecast/public/media/media_clock_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_CLOCK_DEVICE_H_
-#define CHROMECAST_MEDIA_CMA_BACKEND_MEDIA_CLOCK_DEVICE_H_
+#ifndef CHROMECAST_PUBLIC_MEDIA_MEDIA_CLOCK_DEVICE_H_
+#define CHROMECAST_PUBLIC_MEDIA_MEDIA_CLOCK_DEVICE_H_
 
 #include <string>
 
-#include "base/basictypes.h"
-#include "base/macros.h"
-#include "base/threading/non_thread_safe.h"
-#include "base/time/time.h"
-
 namespace chromecast {
 namespace media {
 
 // MediaClockDevice -
 //
 // State machine:
 //                      -------------------
 //                      |                 |
 //                      v                 |
 // kUninitialized --> kIdle  --------- kRunning
 //
 // {any state} --> kError
 //
 // Notes:
 // - Hardware resources are acquired when transitioning from the
 //   |kUninitialized| state to the |kIdle| state.
 // - The initial value of the timeline can only be set in the kIdle state.
 //
-class MediaClockDevice
-    : NON_EXPORTED_BASE(public base::NonThreadSafe) {
+class MediaClockDevice {
  public:
   enum State {
     kStateUninitialized,
     kStateIdle,
     kStateRunning,
     kStateError,
   };
 
-  // Return true if transition from |state1| to |state2| is a valid state
-  // transition.
-  static bool IsValidStateTransition(State state1, State state2);
-
-  // Returns string representation of state (for logging)
-  static std::string StateToString(const State& state);
-
-  MediaClockDevice();
-  virtual ~MediaClockDevice();
+  virtual ~MediaClockDevice() {}
 
   // Return the current state of the media clock.
   virtual State GetState() const = 0;
 
   // Changes the state and performs any necessary transitions.
   // Returns true when successful.
   virtual bool SetState(State new_state) = 0;
 
-  // Sets the initial value of the timeline.
+  // Sets the initial value of the timeline in microseconds.
   // Can only be invoked in state kStateIdle.
   // Returns true when successful.
-  virtual bool ResetTimeline(base::TimeDelta time) = 0;
+  virtual bool ResetTimeline(int64_t time_microseconds) = 0;
 
   // Sets the clock rate.
   // Setting it to 0 means the clock is not progressing and that the renderer
   // tied to this media clock should pause rendering.
   // Can only be invoked in states kStateIdle or kStateRunning.
   virtual bool SetRate(float rate) = 0;
 
-  // Retrieves the media clock time.
+  // Retrieves the media clock time in microseconds.
   // Can only be invoked in states kStateIdle or kStateRunning.
-  virtual base::TimeDelta GetTime() = 0;
-
- private:
-  DISALLOW_COPY_AND_ASSIGN(MediaClockDevice);
+  virtual int64_t GetTime() = 0;
 };
 
 }  // namespace media
 }  // namespace chromecast
 
 #endif  // CHROMECAST_MEDIA_CMA_BACKEND_MEDIA_CLOCK_DEVICE_H_