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/>.
26 #include "compose.hpp"
27 #include "exceptions.h"
28 #include <boost/weak_ptr.hpp>
29 #include <boost/shared_ptr.hpp>
31 #define LOG_TIMING(...) _log->log (String::compose(__VA_ARGS__), LogEntry::TYPE_TIMING);
32 #define LOG_WARNING(...) _log->log (String::compose(__VA_ARGS__), LogEntry::TYPE_WARNING);
38 using boost::weak_ptr;
39 using boost::shared_ptr;
41 using boost::optional;
43 /** Minimum video readahead in frames */
44 #define MINIMUM_VIDEO_READAHEAD 10
45 /** Maximum video readahead in frames; should never be reached unless there are bugs in Player */
46 #define MAXIMUM_VIDEO_READAHEAD 24
47 /** Minimum audio readahead in frames */
48 #define MINIMUM_AUDIO_READAHEAD (48000 * MINIMUM_VIDEO_READAHEAD / 24)
49 /** Minimum audio readahead in frames; should never be reached unless there are bugs in Player */
50 #define MAXIMUM_AUDIO_READAHEAD (48000 * MAXIMUM_VIDEO_READAHEAD / 24)
52 Butler::Butler (shared_ptr<Player> player, shared_ptr<Log> log, AudioMapping audio_mapping, int audio_channels)
55 , _prepare_work (new boost::asio::io_service::work (_prepare_service))
56 , _pending_seek_accurate (false)
60 , _stop_thread (false)
61 , _audio_mapping (audio_mapping)
62 , _audio_channels (audio_channels)
63 , _disable_audio (false)
65 _player_video_connection = _player->Video.connect (bind (&Butler::video, this, _1, _2));
66 _player_audio_connection = _player->Audio.connect (bind (&Butler::audio, this, _1, _2));
67 _player_text_connection = _player->Text.connect (bind (&Butler::text, this, _1, _2, _3, _4));
68 /* The butler must here about things first, otherwise it might not sort out suspensions in time for
69 get_video() to be called in response to this signal.
71 _player_change_connection = _player->Change.connect (bind (&Butler::player_change, this, _1, _3), boost::signals2::at_front);
72 _thread = new boost::thread (bind (&Butler::thread, this));
73 #ifdef DCPOMATIC_LINUX
74 pthread_setname_np (_thread->native_handle(), "butler");
77 /* Create some threads to do work on the PlayerVideos we are creating; at present this is used to
78 multi-thread JPEG2000 decoding.
81 LOG_TIMING("start-prepare-threads %1", boost::thread::hardware_concurrency());
82 for (size_t i = 0; i < boost::thread::hardware_concurrency(); ++i) {
83 _prepare_pool.create_thread (bind (&boost::asio::io_service::run, &_prepare_service));
90 boost::mutex::scoped_lock lm (_mutex);
94 _prepare_work.reset ();
95 _prepare_pool.join_all ();
96 _prepare_service.stop ();
98 _thread->interrupt ();
101 } catch (boost::thread_interrupted& e) {
107 /** Caller must hold a lock on _mutex */
109 Butler::should_run () const
111 if (_video.size() >= MAXIMUM_VIDEO_READAHEAD * 10) {
112 /* This is way too big */
113 throw ProgrammingError
114 (__FILE__, __LINE__, String::compose ("Butler video buffers reached %1 frames (audio is %2)", _video.size(), _audio.size()));
117 if (_audio.size() >= MAXIMUM_AUDIO_READAHEAD * 10) {
118 /* This is way too big */
119 throw ProgrammingError
120 (__FILE__, __LINE__, String::compose ("Butler audio buffers reached %1 frames (video is %2)", _audio.size(), _video.size()));
123 if (_video.size() >= MAXIMUM_VIDEO_READAHEAD * 2) {
124 LOG_WARNING ("Butler video buffers reached %1 frames (audio is %2)", _video.size(), _audio.size());
127 if (_audio.size() >= MAXIMUM_AUDIO_READAHEAD * 2) {
128 LOG_WARNING ("Butler audio buffers reached %1 frames (video is %2)", _audio.size(), _video.size());
131 if (_stop_thread || _finished || _died || _suspended) {
132 /* Definitely do not run */
136 if (_video.size() < MINIMUM_VIDEO_READAHEAD || (!_disable_audio && _audio.size() < MINIMUM_AUDIO_READAHEAD)) {
137 /* Definitely do run: we need data */
141 /* Run if we aren't full of video or audio */
142 return (_video.size() < MAXIMUM_VIDEO_READAHEAD) && (_audio.size() < MAXIMUM_AUDIO_READAHEAD);
150 boost::mutex::scoped_lock lm (_mutex);
152 /* Wait until we have something to do */
153 while (!should_run() && !_pending_seek_position) {
157 /* Do any seek that has been requested */
158 if (_pending_seek_position) {
160 _player->seek (*_pending_seek_position, _pending_seek_accurate);
161 _pending_seek_position = optional<DCPTime> ();
164 /* Fill _video and _audio. Don't try to carry on if a pending seek appears
165 while lm is unlocked, as in that state nothing will be added to
168 while (should_run() && !_pending_seek_position) {
170 bool const r = _player->pass ();
174 _arrived.notify_all ();
177 _arrived.notify_all ();
180 } catch (boost::thread_interrupted) {
181 /* The butler thread is being terminated */
182 boost::mutex::scoped_lock lm (_mutex);
184 _arrived.notify_all ();
187 boost::mutex::scoped_lock lm (_mutex);
189 _arrived.notify_all ();
192 pair<shared_ptr<PlayerVideo>, DCPTime>
193 Butler::get_video (Error* e)
195 boost::mutex::scoped_lock lm (_mutex);
201 return make_pair(shared_ptr<PlayerVideo>(), DCPTime());
204 /* Wait for data if we have none */
205 while (_video.empty() && !_finished && !_died) {
209 if (_video.empty()) {
213 return make_pair(shared_ptr<PlayerVideo>(), DCPTime());
216 pair<shared_ptr<PlayerVideo>, DCPTime> const r = _video.get ();
217 _summon.notify_all ();
221 optional<TextRingBuffers::Data>
222 Butler::get_closed_caption ()
224 boost::mutex::scoped_lock lm (_mutex);
225 return _closed_caption.get ();
229 Butler::seek (DCPTime position, bool accurate)
231 boost::mutex::scoped_lock lm (_mutex);
232 seek_unlocked (position, accurate);
236 Butler::seek_unlocked (DCPTime position, bool accurate)
243 _pending_seek_position = position;
244 _pending_seek_accurate = accurate;
247 boost::mutex::scoped_lock lm (_buffers_mutex);
250 _closed_caption.clear ();
253 _summon.notify_all ();
257 Butler::prepare (weak_ptr<PlayerVideo> weak_video) const
259 shared_ptr<PlayerVideo> video = weak_video.lock ();
260 /* If the weak_ptr cannot be locked the video obviously no longer requires any work */
262 LOG_TIMING("start-prepare in %1", thread_id());
264 LOG_TIMING("finish-prepare in %1", thread_id());
269 Butler::video (shared_ptr<PlayerVideo> video, DCPTime time)
271 boost::mutex::scoped_lock lm (_mutex);
273 if (_pending_seek_position) {
274 /* Don't store any video in this case */
278 _prepare_service.post (bind (&Butler::prepare, this, weak_ptr<PlayerVideo>(video)));
280 boost::mutex::scoped_lock lm2 (_buffers_mutex);
281 _video.put (video, time);
285 Butler::audio (shared_ptr<AudioBuffers> audio, DCPTime time)
288 boost::mutex::scoped_lock lm (_mutex);
289 if (_pending_seek_position || _disable_audio) {
290 /* Don't store any audio in these cases */
295 boost::mutex::scoped_lock lm2 (_buffers_mutex);
296 _audio.put (remap (audio, _audio_channels, _audio_mapping), time);
299 /** Try to get `frames' frames of audio and copy it into `out'. Silence
300 * will be filled if no audio is available.
301 * @return time of this audio, or unset if there was a buffer underrun.
304 Butler::get_audio (float* out, Frame frames)
306 optional<DCPTime> t = _audio.get (out, _audio_channels, frames);
307 _summon.notify_all ();
312 Butler::disable_audio ()
314 boost::mutex::scoped_lock lm (_mutex);
315 _disable_audio = true;
319 Butler::memory_used () const
321 /* XXX: should also look at _audio.memory_used() */
322 return _video.memory_used();
326 Butler::player_change (ChangeType type, bool frequent)
328 boost::mutex::scoped_lock lm (_mutex);
330 if (type == CHANGE_TYPE_PENDING) {
332 } else if (type == CHANGE_TYPE_DONE) {
334 if (_died || _pending_seek_position || frequent) {
336 _summon.notify_all ();
341 DCPTime next = _video.get().second;
342 if (_awaiting && _awaiting > next) {
343 /* We have recently done a player_changed seek and our buffers haven't been refilled yet,
344 so assume that we're seeking to the same place as last time.
346 seek_to = *_awaiting;
351 seek_unlocked (seek_to, true);
353 } else if (type == CHANGE_TYPE_CANCELLED) {
358 _summon.notify_all ();
362 Butler::text (PlayerText pt, TextType type, optional<DCPTextTrack> track, DCPTimePeriod period)
364 if (type != TEXT_CLOSED_CAPTION) {
368 DCPOMATIC_ASSERT (track);
370 boost::mutex::scoped_lock lm2 (_buffers_mutex);
371 _closed_caption.put (pt, *track, period);