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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 <libdcp/picture_asset.h>
#include "writer.h"
#include "compose.hpp"
#include "film.h"
#include "format.h"
#include "log.h"
#include "dcp_video_frame.h"
using std::make_pair;
using std::pair;
using boost::shared_ptr;
unsigned int const Writer::_maximum_frames_in_memory = 8;
Writer::Writer (shared_ptr<const Film> f)
: _film (f)
, _thread (0)
, _finish (false)
, _last_written_frame (-1)
{
_picture_asset.reset (
new libdcp::MonoPictureAsset (
_film->dir (_film->dcp_name()),
String::compose ("video_%1.mxf", 0),
DCPFrameRate (_film->frames_per_second()).frames_per_second,
_film->format()->dcp_size()
)
);
_picture_asset_writer = _picture_asset->start_write ();
_thread = new boost::thread (boost::bind (&Writer::thread, this));
}
void
Writer::write (shared_ptr<EncodedData> encoded, int frame)
{
boost::mutex::scoped_lock lock (_mutex);
_queue.push_back (make_pair (encoded, frame));
_condition.notify_all ();
}
struct QueueSorter
{
bool operator() (pair<shared_ptr<EncodedData>, int> const & a, pair<shared_ptr<EncodedData>, int> const & b) {
return a.second < b.second;
}
};
void
Writer::thread ()
{
while (1)
{
boost::mutex::scoped_lock lock (_mutex);
while (1) {
if (_finish ||
_queue.size() > _maximum_frames_in_memory ||
(!_queue.empty() && _queue.front().second == (_last_written_frame + 1))) {
break;
}
TIMING ("writer sleeps with a queue of %1; %2 pending", _queue.size(), _pending.size());
_condition.wait (lock);
TIMING ("writer wakes with a queue of %1", _queue.size());
_queue.sort (QueueSorter ());
}
if (_finish && _queue.empty() && _pending.empty()) {
return;
}
/* Write any frames that we can write; i.e. those that are in sequence */
while (!_queue.empty() && _queue.front().second == (_last_written_frame + 1)) {
pair<boost::shared_ptr<EncodedData>, int> encoded = _queue.front ();
_queue.pop_front ();
lock.unlock ();
_film->log()->log (String::compose ("Writer writes %1 to MXF", encoded.second));
if (encoded.first) {
_picture_asset_writer->write (encoded.first->data(), encoded.first->size());
_last_written = encoded.first;
} else {
_picture_asset_writer->write (_last_written->data(), _last_written->size());
}
lock.lock ();
++_last_written_frame;
}
while (_queue.size() > _maximum_frames_in_memory) {
/* Too many frames in memory which can't yet be written to the stream.
Put some to disk.
*/
pair<boost::shared_ptr<EncodedData>, int> encoded = _queue.back ();
_queue.pop_back ();
if (!encoded.first) {
/* This is a `repeat-last' frame, so no need to write it to disk */
continue;
}
lock.unlock ();
_film->log()->log (String::compose ("Writer full (awaiting %1); pushes %2 to disk", _last_written_frame + 1, encoded.second));
encoded.first->write (_film, encoded.second);
lock.lock ();
_pending.push_back (encoded.second);
}
while (_queue.size() < _maximum_frames_in_memory && !_pending.empty()) {
/* We have some space in memory. Fetch some frames back off disk. */
_pending.sort ();
int const fetch = _pending.front ();
lock.unlock ();
_film->log()->log (String::compose ("Writer pulls %1 back from disk", fetch));
shared_ptr<EncodedData> encoded;
if (boost::filesystem::exists (_film->frame_out_path (fetch, false))) {
/* It's an actual frame (not a repeat-last); load it in */
encoded.reset (new EncodedData (_film->frame_out_path (fetch, false)));
}
lock.lock ();
_queue.push_back (make_pair (encoded, fetch));
_pending.remove (fetch);
}
}
}
void
Writer::finish ()
{
if (!_thread) {
return;
}
boost::mutex::scoped_lock lock (_mutex);
_finish = true;
_condition.notify_all ();
lock.unlock ();
_thread->join ();
delete _thread;
_thread = 0;
_picture_asset_writer->finalize ();
}
/** Tell the writer that frame `f' should be a repeat of the frame before it */
void
Writer::repeat (int f)
{
boost::mutex::scoped_lock lock (_mutex);
_queue.push_back (make_pair (shared_ptr<EncodedData> (), f));
}
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