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// Copyright 2013 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 MEDIA_CAST_CAST_ENVIRONMENT_H_
#define MEDIA_CAST_CAST_ENVIRONMENT_H_
#include "base/macros.h"
#include "base/memory/ref_counted.h"
#include "base/memory/scoped_ptr.h"
#include "base/single_thread_task_runner.h"
#include "base/time/tick_clock.h"
#include "base/time/time.h"
#include "media/cast/logging/log_event_dispatcher.h"
namespace media {
namespace cast {
class CastEnvironment : public base::RefCountedThreadSafe<CastEnvironment> {
public:
// An enumeration of the cast threads.
enum ThreadId {
// The main thread is where the cast system is configured and where timers
// and network IO is performed.
MAIN,
// The audio thread is where all send side audio processing is done,
// primarily encoding / decoding but also re-sampling.
AUDIO,
// The video encoder thread is where the video processing is done.
VIDEO,
};
CastEnvironment(
scoped_ptr<base::TickClock> clock,
scoped_refptr<base::SingleThreadTaskRunner> main_thread_proxy,
scoped_refptr<base::SingleThreadTaskRunner> audio_thread_proxy,
scoped_refptr<base::SingleThreadTaskRunner> video_thread_proxy);
// These are the same methods in message_loop.h, but are guaranteed to either
// get posted to the MessageLoop if it's still alive, or be deleted otherwise.
// They return true iff the thread existed and the task was posted. Note that
// even if the task is posted, there's no guarantee that it will run, since
// the target thread may already have a Quit message in its queue.
bool PostTask(ThreadId identifier,
const tracked_objects::Location& from_here,
const base::Closure& task);
bool PostDelayedTask(ThreadId identifier,
const tracked_objects::Location& from_here,
const base::Closure& task,
base::TimeDelta delay);
bool CurrentlyOn(ThreadId identifier);
// All of the media::cast implementation must use this TickClock.
base::TickClock* Clock() const { return clock_.get(); }
// Thread-safe log event dispatcher.
LogEventDispatcher* logger() { return &logger_; }
scoped_refptr<base::SingleThreadTaskRunner> GetTaskRunner(
ThreadId identifier) const;
bool HasAudioThread() { return audio_thread_proxy_.get() ? true : false; }
bool HasVideoThread() { return video_thread_proxy_.get() ? true : false; }
protected:
virtual ~CastEnvironment();
// Subclasses may final these.
scoped_refptr<base::SingleThreadTaskRunner> main_thread_proxy_;
scoped_refptr<base::SingleThreadTaskRunner> audio_thread_proxy_;
scoped_refptr<base::SingleThreadTaskRunner> video_thread_proxy_;
scoped_ptr<base::TickClock> clock_;
LogEventDispatcher logger_;
private:
friend class base::RefCountedThreadSafe<CastEnvironment>;
DISALLOW_COPY_AND_ASSIGN(CastEnvironment);
};
} // namespace cast
} // namespace media
#endif // MEDIA_CAST_CAST_ENVIRONMENT_H_
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