2 Copyright (C) 2012 Carl Hetherington <cth@carlh.net>
4 This program is free software; you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation; either version 2 of the License, or
7 (at your option) any later version.
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 GNU General Public License for more details.
14 You should have received a copy of the GNU General Public License
15 along with this program; if not, write to the Free Software
16 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
20 #include <libdcp/picture_asset.h>
21 #include <libdcp/sound_asset.h>
22 #include <libdcp/reel.h>
24 #include "compose.hpp"
28 #include "dcp_video_frame.h"
32 using boost::shared_ptr;
34 unsigned int const Writer::_maximum_frames_in_memory = 8;
36 Writer::Writer (shared_ptr<Film> f)
40 , _last_written_frame (-1)
42 _picture_asset.reset (
43 new libdcp::MonoPictureAsset (
44 _film->dir (_film->dcp_name()),
45 _film->video_mxf_path(),
46 DCPFrameRate (_film->frames_per_second()).frames_per_second,
47 _film->format()->dcp_size()
51 _picture_asset_writer = _picture_asset->start_write ();
53 if (_film->audio_channels() > 0) {
55 new libdcp::SoundAsset (
56 _film->dir (_film->dcp_name()),
58 DCPFrameRate (_film->frames_per_second()).frames_per_second,
59 _film->audio_channels(),
60 dcp_audio_sample_rate (_film->audio_stream()->sample_rate())
64 _sound_asset_writer = _sound_asset->start_write ();
67 _thread = new boost::thread (boost::bind (&Writer::thread, this));
71 Writer::write (shared_ptr<const EncodedData> encoded, int frame)
73 boost::mutex::scoped_lock lock (_mutex);
74 _queue.push_back (make_pair (encoded, frame));
75 _condition.notify_all ();
78 /** This method is not thread safe */
80 Writer::write (shared_ptr<const AudioBuffers> audio)
82 _sound_asset_writer->write (audio->data(), audio->frames());
87 bool operator() (pair<shared_ptr<const EncodedData>, int> const & a, pair<shared_ptr<const EncodedData>, int> const & b) {
88 return a.second < b.second;
97 boost::mutex::scoped_lock lock (_mutex);
101 _queue.size() > _maximum_frames_in_memory ||
102 (!_queue.empty() && _queue.front().second == (_last_written_frame + 1))) {
107 TIMING ("writer sleeps with a queue of %1; %2 pending", _queue.size(), _pending.size());
108 _condition.wait (lock);
109 TIMING ("writer wakes with a queue of %1", _queue.size());
111 _queue.sort (QueueSorter ());
114 if (_finish && _queue.empty() && _pending.empty()) {
118 /* Write any frames that we can write; i.e. those that are in sequence */
119 while (!_queue.empty() && _queue.front().second == (_last_written_frame + 1)) {
120 pair<boost::shared_ptr<const EncodedData>, int> encoded = _queue.front ();
124 _film->log()->log (String::compose ("Writer writes %1 to MXF", encoded.second));
126 _picture_asset_writer->write (encoded.first->data(), encoded.first->size());
127 encoded.first->write_hash (_film, encoded.second);
128 _last_written = encoded.first;
130 _picture_asset_writer->write (_last_written->data(), _last_written->size());
131 _last_written->write_hash (_film, encoded.second);
135 ++_last_written_frame;
138 while (_queue.size() > _maximum_frames_in_memory) {
139 /* Too many frames in memory which can't yet be written to the stream.
143 pair<boost::shared_ptr<const EncodedData>, int> encoded = _queue.back ();
145 if (!encoded.first) {
146 /* This is a `repeat-last' frame, so no need to write it to disk */
151 _film->log()->log (String::compose ("Writer full (awaiting %1); pushes %2 to disk", _last_written_frame + 1, encoded.second));
152 encoded.first->write (_film, encoded.second);
155 _pending.push_back (encoded.second);
158 while (_queue.size() < _maximum_frames_in_memory && !_pending.empty()) {
159 /* We have some space in memory. Fetch some frames back off disk. */
162 int const fetch = _pending.front ();
165 _film->log()->log (String::compose ("Writer pulls %1 back from disk", fetch));
166 shared_ptr<const EncodedData> encoded;
167 if (boost::filesystem::exists (_film->j2c_path (fetch, false))) {
168 /* It's an actual frame (not a repeat-last); load it in */
169 encoded.reset (new EncodedData (_film->j2c_path (fetch, false)));
173 _queue.push_back (make_pair (encoded, fetch));
174 _pending.remove (fetch);
187 boost::mutex::scoped_lock lock (_mutex);
189 _condition.notify_all ();
196 _picture_asset_writer->finalize ();
198 if (_sound_asset_writer) {
199 _sound_asset_writer->finalize ();
202 int const frames = _last_written_frame + 1;
203 int const duration = frames - _film->trim_start() - _film->trim_end();
205 _film->set_dcp_intrinsic_duration (frames);
207 _picture_asset->set_entry_point (_film->trim_start ());
208 _picture_asset->set_duration (duration);
211 _sound_asset->set_entry_point (_film->trim_start ());
212 _sound_asset->set_duration (duration);
215 libdcp::DCP dcp (_film->dir (_film->dcp_name()));
216 DCPFrameRate dfr (_film->frames_per_second ());
218 shared_ptr<libdcp::CPL> cpl (
219 new libdcp::CPL (_film->dir (_film->dcp_name()), _film->dcp_name(), _film->dcp_content_type()->libdcp_kind (), frames, dfr.frames_per_second)
224 cpl->add_reel (shared_ptr<libdcp::Reel> (new libdcp::Reel (
227 shared_ptr<libdcp::SubtitleAsset> ()
234 /** Tell the writer that frame `f' should be a repeat of the frame before it */
236 Writer::repeat (int f)
238 boost::mutex::scoped_lock lock (_mutex);
239 _queue.push_back (make_pair (shared_ptr<const EncodedData> (), f));