2 Copyright (C) 2016-2017 Carl Hetherington <cth@carlh.net>
4 This file is part of DCP-o-matic.
6 DCP-o-matic is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2 of the License, or
9 (at your option) any later version.
11 DCP-o-matic is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with DCP-o-matic. If not, see <http://www.gnu.org/licenses/>.
23 #include <boost/weak_ptr.hpp>
24 #include <boost/shared_ptr.hpp>
29 using boost::weak_ptr;
30 using boost::shared_ptr;
32 using boost::optional;
34 /** Video readahead in frames */
35 #define VIDEO_READAHEAD 10
36 /** Audio readahead in frames */
37 #define AUDIO_READAHEAD (48000*5)
39 Butler::Butler (weak_ptr<const Film> film, shared_ptr<Player> player, AudioMapping audio_mapping, int audio_channels)
42 , _pending_seek_accurate (false)
45 , _stop_thread (false)
46 , _audio_mapping (audio_mapping)
47 , _audio_channels (audio_channels)
48 , _disable_audio (false)
50 _player_video_connection = _player->Video.connect (bind (&Butler::video, this, _1, _2));
51 _player_audio_connection = _player->Audio.connect (bind (&Butler::audio, this, _1, _2));
52 _player_changed_connection = _player->Changed.connect (bind (&Butler::player_changed, this));
53 _thread = new boost::thread (bind (&Butler::thread, this));
59 boost::mutex::scoped_lock lm (_mutex);
63 _thread->interrupt ();
66 } catch (boost::thread_interrupted& e) {
72 /** Caller must hold a lock on _mutex */
74 Butler::should_run () const
76 return (_video.size() < VIDEO_READAHEAD || (!_disable_audio && _audio.size() < AUDIO_READAHEAD)) && !_stop_thread && !_finished && !_died;
84 boost::mutex::scoped_lock lm (_mutex);
86 /* Wait until we have something to do */
87 while (!should_run() && !_pending_seek_position) {
91 /* Do any seek that has been requested */
92 if (_pending_seek_position) {
94 _player->seek (*_pending_seek_position, _pending_seek_accurate);
95 _pending_seek_position = optional<DCPTime> ();
98 /* Fill _video and _audio. Don't try to carry on if a pending seek appears
99 while lm is unlocked, as in that state nothing will be added to
102 while (should_run() && !_pending_seek_position) {
104 bool const r = _player->pass ();
108 _arrived.notify_all ();
111 _arrived.notify_all ();
114 } catch (boost::thread_interrupted) {
115 /* The butler thread is being terminated */
116 boost::mutex::scoped_lock lm (_mutex);
118 _arrived.notify_all ();
121 boost::mutex::scoped_lock lm (_mutex);
123 _arrived.notify_all ();
126 pair<shared_ptr<PlayerVideo>, DCPTime>
129 boost::mutex::scoped_lock lm (_mutex);
131 /* Wait for data if we have none */
132 while (_video.empty() && !_finished && !_died) {
136 if (_video.empty()) {
137 return make_pair (shared_ptr<PlayerVideo>(), DCPTime());
140 pair<shared_ptr<PlayerVideo>, DCPTime> const r = _video.get ();
141 _summon.notify_all ();
146 Butler::seek (DCPTime position, bool accurate)
148 boost::mutex::scoped_lock lm (_mutex);
156 _pending_seek_position = position;
157 _pending_seek_accurate = accurate;
158 _summon.notify_all ();
162 Butler::video (shared_ptr<PlayerVideo> video, DCPTime time)
165 boost::mutex::scoped_lock lm (_mutex);
166 if (_pending_seek_position) {
167 /* Don't store any video while a seek is pending */
172 _video.put (video, time);
176 Butler::audio (shared_ptr<AudioBuffers> audio, DCPTime time)
179 boost::mutex::scoped_lock lm (_mutex);
180 if (_pending_seek_position || _disable_audio) {
181 /* Don't store any audio while a seek is pending, or if audio is disabled */
186 _audio.put (audio, time);
190 Butler::player_changed ()
195 boost::mutex::scoped_lock lm (_mutex);
196 t = _video.earliest ();
208 Butler::get_audio (float* out, Frame frames)
210 _audio.get (out, _audio_channels, frames);
211 _summon.notify_all ();
215 Butler::disable_audio ()
217 boost::mutex::scoped_lock lm (_mutex);
218 _disable_audio = true;