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/*
Copyright (C) 2012 Carl Hetherington <cth@carlh.net>
This program 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.
This program 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 this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <list>
#include <boost/shared_ptr.hpp>
#include <boost/thread.hpp>
#include <boost/thread/condition.hpp>
#include "exceptions.h"
class Film;
class EncodedData;
class AudioBuffers;
namespace libdcp {
class MonoPictureAsset;
class MonoPictureAssetWriter;
class SoundAsset;
class SoundAssetWriter;
}
struct QueueItem
{
public:
enum Type {
/** a normal frame with some JPEG200 data */
FULL,
/** a frame whose data already exists in the MXF,
and we fake-write it; i.e. we update the writer's
state but we use the data that is already on disk.
*/
FAKE,
/** this is a repeat of the last frame to be written */
REPEAT
} type;
/** encoded data for FULL */
boost::shared_ptr<const EncodedData> encoded;
/** size of data for FAKE */
int size;
/** frame index */
int frame;
};
bool operator< (QueueItem const & a, QueueItem const & b);
bool operator== (QueueItem const & a, QueueItem const & b);
class Writer : public ExceptionStore
{
public:
Writer (boost::shared_ptr<Film>);
bool can_fake_write (int) const;
void write (boost::shared_ptr<const EncodedData>, int);
void fake_write (int);
void write (boost::shared_ptr<const AudioBuffers>);
void repeat (int f);
void finish ();
private:
void thread ();
void check_existing_picture_mxf ();
/** our Film */
boost::shared_ptr<Film> _film;
/** the first frame index that does not already exist in our MXF */
int _first_nonexistant_frame;
/** our thread, or 0 */
boost::thread* _thread;
/** true if our thread should finish */
bool _finish;
/** queue of things to write to disk */
std::list<QueueItem> _queue;
/** number of FULL frames whose JPEG200 data is currently held in RAM */
int _queued_full_in_memory;
/** mutex for thread state */
mutable boost::mutex _mutex;
/** condition to manage thread wakeups */
boost::condition _condition;
/** the data of the last written frame, or 0 if there isn't one */
boost::shared_ptr<const EncodedData> _last_written;
/** the index of the last written frame */
int _last_written_frame;
/** maximum number of frames to hold in memory, for when we are managing
ordering
*/
static const int _maximum_frames_in_memory;
/** number of FULL written frames */
int _full_written;
/** number of FAKE written frames */
int _fake_written;
/** number of REPEAT written frames */
int _repeat_written;
/** number of frames pushed to disk and then recovered
due to the limit of frames to be held in memory.
*/
int _pushed_to_disk;
boost::shared_ptr<libdcp::MonoPictureAsset> _picture_asset;
boost::shared_ptr<libdcp::MonoPictureAssetWriter> _picture_asset_writer;
boost::shared_ptr<libdcp::SoundAsset> _sound_asset;
boost::shared_ptr<libdcp::SoundAssetWriter> _sound_asset_writer;
};
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