chromecast/media/cma/base/media_task_runner.h

   1 // Copyright 2014 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef CHROMECAST_MEDIA_CMA_BASE_MEDIA_TASK_RUNNER_H_
   6 #define CHROMECAST_MEDIA_CMA_BASE_MEDIA_TASK_RUNNER_H_
   7
   8 #include "base/callback.h"
   9 #include "base/location.h"
  10 #include "base/macros.h"
  11 #include "base/memory/ref_counted.h"
  12 #include "base/time/time.h"
  13
  14 namespace chromecast {
  15 namespace media {
  16
  17 class MediaTaskRunner
  18     : public base::RefCountedThreadSafe<MediaTaskRunner> {
  19  public:
  20   MediaTaskRunner();
  21
  22   // Post a task with the given media |timestamp|. If |timestamp| is equal to
  23   // |kNoTimestamp()|, the task is scheduled right away.
  24   // How the media timestamp is used to schedule the task is an implementation
  25   // detail of derived classes.
  26   // Returns true if the task may be run at some point in the future, and false
  27   // if the task definitely will not be run.
  28   virtual bool PostMediaTask(
  29       const tracked_objects::Location& from_here,
  30       const base::Closure& task,
  31       base::TimeDelta timestamp) = 0;
  32
  33  protected:
  34   virtual ~MediaTaskRunner();
  35   friend class base::RefCountedThreadSafe<MediaTaskRunner>;
  36
  37  private:
  38   DISALLOW_COPY_AND_ASSIGN(MediaTaskRunner);
  39 };
  40
  41 }  // namespace media
  42 }  // namespace chromecast
  43
  44 #endif  // CHROMECAST_MEDIA_CMA_BASE_MEDIA_TASK_RUNNER_H_