/*
    Copyright (C) 2012-2019 Carl Hetherington <cth@carlh.net>

    This file is part of DCP-o-matic.

    DCP-o-matic is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    (at your option) any later version.

    DCP-o-matic is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with DCP-o-matic.  If not, see <http://www.gnu.org/licenses/>.

*/

#ifndef DCPOMATIC_J2K_ENCODER_H
#define DCPOMATIC_J2K_ENCODER_H

/** @file  src/j2k_encoder.h
 *  @brief J2KEncoder class.
 */

#include "util.h"
#include "cross.h"
#include "event_history.h"
#include "exception_store.h"
#include <boost/shared_ptr.hpp>
#include <boost/thread/mutex.hpp>
#include <boost/thread/condition.hpp>
#include <boost/thread.hpp>
#include <boost/optional.hpp>
#include <boost/signals2.hpp>
#include <boost/enable_shared_from_this.hpp>
#include <list>
#include <stdint.h>

class Film;
class EncodeServerDescription;
class DCPVideo;
class Writer;
class Job;
class PlayerVideo;
class J2KEncodeWorker;

/** @class J2KEncoder
 *  @brief Class to manage encoding to J2K.
 *
 *  This class keeps a queue of frames to be encoded and distributes
 *  the work around threads and encoding servers.
 */

class J2KEncoder : public boost::noncopyable, public ExceptionStore, public boost::enable_shared_from_this<J2KEncoder>
{
public:
	J2KEncoder (boost::shared_ptr<const Film> film, boost::shared_ptr<Writer> writer);
	~J2KEncoder ();

	/** Called to indicate that a processing run is about to begin */
	void begin ();

	/** Called to pass a bit of video to be encoded as the next DCP frame */
	void encode (boost::shared_ptr<PlayerVideo> pv, dcpomatic::DCPTime time);

	/** Called when a processing run has finished */
	void end ();

	boost::optional<float> current_encoding_rate () const;
	int video_frames_enqueued () const;

	void servers_list_changed ();

private:

	static void call_servers_list_changed (boost::weak_ptr<J2KEncoder> encoder);

	void frame_done ();

	void encoder_thread (boost::weak_ptr<J2KEncodeWorker>);
	void terminate_threads ();

	/** Film that we are encoding */
	boost::shared_ptr<const Film> _film;

	EventHistory _history;

	boost::shared_ptr<boost::thread_group> _threads;

	mutable boost::mutex _queue_mutex;
	std::list<boost::shared_ptr<DCPVideo> > _queue;
	std::list<boost::shared_ptr<J2KEncodeWorker> > _workers;
	/** condition to manage thread wakeups when we have nothing to do */
	boost::condition _empty_condition;
	/** condition to manage thread wakeups when we have too much to do */
	boost::condition _full_condition;

	boost::shared_ptr<Writer> _writer;
	Waker _waker;

	boost::shared_ptr<PlayerVideo> _last_player_video[EYES_COUNT];
	boost::optional<dcpomatic::DCPTime> _last_player_video_time;

	boost::signals2::scoped_connection _server_found_connection;
};

#endif