2 Copyright (C) 2012-2014 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 /** @file src/encoder.h
21 * @brief Parent class for classes which can encode video and audio frames.
25 #include <boost/lambda/lambda.hpp>
26 #include <libcxml/cxml.h>
32 #include "dcp_video.h"
36 #include "server_finder.h"
38 #include "player_video.h"
42 #define LOG_GENERAL(...) _film->log()->log (String::compose (__VA_ARGS__), Log::TYPE_GENERAL);
43 #define LOG_ERROR(...) _film->log()->log (String::compose (__VA_ARGS__), Log::TYPE_ERROR);
44 #define LOG_TIMING(...) _film->log()->microsecond_log (String::compose (__VA_ARGS__), Log::TYPE_TIMING);
48 using std::stringstream;
54 using boost::shared_ptr;
55 using boost::weak_ptr;
56 using boost::optional;
57 using boost::scoped_array;
59 int const Encoder::_history_size = 25;
61 /** @param f Film that we are encoding */
62 Encoder::Encoder (shared_ptr<const Film> f, weak_ptr<Job> j)
65 , _video_frames_out (0)
76 /** Add a worker thread for a each thread on a remote server. Caller must hold
77 * a lock on _mutex, or know that one is not currently required to
78 * safely modify _threads.
81 Encoder::add_worker_threads (ServerDescription d)
83 LOG_GENERAL (N_("Adding %1 worker threads for remote %2"), d.host_name ());
84 for (int i = 0; i < d.threads(); ++i) {
85 _threads.push_back (new boost::thread (boost::bind (&Encoder::encoder_thread, this, d)));
90 Encoder::process_begin ()
92 for (int i = 0; i < Config::instance()->num_local_encoding_threads (); ++i) {
93 _threads.push_back (new boost::thread (boost::bind (&Encoder::encoder_thread, this, optional<ServerDescription> ())));
96 _writer.reset (new Writer (_film, _job));
97 ServerFinder::instance()->connect (boost::bind (&Encoder::server_found, this, _1));
101 Encoder::process_end ()
103 boost::mutex::scoped_lock lock (_mutex);
105 LOG_GENERAL (N_("Clearing queue of %1"), _queue.size ());
107 /* Keep waking workers until the queue is empty */
108 while (!_queue.empty ()) {
109 _empty_condition.notify_all ();
110 _full_condition.wait (lock);
115 terminate_threads ();
117 LOG_GENERAL (N_("Mopping up %1"), _queue.size());
119 /* The following sequence of events can occur in the above code:
120 1. a remote worker takes the last image off the queue
121 2. the loop above terminates
122 3. the remote worker fails to encode the image and puts it back on the queue
123 4. the remote worker is then terminated by terminate_threads
125 So just mop up anything left in the queue here.
128 for (list<shared_ptr<DCPVideo> >::iterator i = _queue.begin(); i != _queue.end(); ++i) {
129 LOG_GENERAL (N_("Encode left-over frame %1"), (*i)->index ());
131 _writer->write ((*i)->encode_locally(), (*i)->index (), (*i)->eyes ());
133 } catch (std::exception& e) {
134 LOG_ERROR (N_("Local encode failed (%1)"), e.what ());
142 /** @return an estimate of the current number of frames we are encoding per second,
146 Encoder::current_encoding_rate () const
148 boost::mutex::scoped_lock lock (_state_mutex);
149 if (int (_time_history.size()) < _history_size) {
154 gettimeofday (&now, 0);
156 return _history_size / (seconds (now) - seconds (_time_history.back ()));
159 /** @return Number of video frames that have been sent out */
161 Encoder::video_frames_out () const
163 boost::mutex::scoped_lock (_state_mutex);
164 return _video_frames_out;
167 /** Should be called when a frame has been encoded successfully.
168 * @param n Source frame index.
171 Encoder::frame_done ()
173 boost::mutex::scoped_lock lock (_state_mutex);
176 gettimeofday (&tv, 0);
177 _time_history.push_front (tv);
178 if (int (_time_history.size()) > _history_size) {
179 _time_history.pop_back ();
184 Encoder::process_video (shared_ptr<PlayerVideo> pvf)
188 boost::mutex::scoped_lock lock (_mutex);
190 /* XXX: discard 3D here if required */
192 /* Wait until the queue has gone down a bit */
193 while (_queue.size() >= _threads.size() * 2 && !_terminate) {
194 LOG_TIMING ("decoder sleeps with queue of %1", _queue.size());
195 _full_condition.wait (lock);
196 LOG_TIMING ("decoder wakes with queue of %1", _queue.size());
204 /* Re-throw any exception raised by one of our threads. If more
205 than one has thrown an exception, only one will be rethrown, I think;
206 but then, if that happens something has gone badly wrong.
210 if (_writer->can_fake_write (_video_frames_out)) {
211 _writer->fake_write (_video_frames_out, pvf->eyes ());
214 /* Queue this new frame for encoding */
215 LOG_TIMING ("adding to queue of %1", _queue.size ());
216 _queue.push_back (shared_ptr<DCPVideo> (
220 _film->video_frame_rate(),
221 _film->j2k_bandwidth(),
223 _film->burn_subtitles(),
228 /* The queue might not be empty any more, so notify anything which is
231 _empty_condition.notify_all ();
234 if (pvf->eyes() != EYES_LEFT) {
240 Encoder::process_audio (shared_ptr<const AudioBuffers> data)
242 _writer->write (data);
246 Encoder::terminate_threads ()
249 boost::mutex::scoped_lock lock (_mutex);
251 _full_condition.notify_all ();
252 _empty_condition.notify_all ();
255 for (list<boost::thread *>::iterator i = _threads.begin(); i != _threads.end(); ++i) {
256 if ((*i)->joinable ()) {
266 Encoder::encoder_thread (optional<ServerDescription> server)
269 /* Number of seconds that we currently wait between attempts
270 to connect to the server; not relevant for localhost
273 int remote_backoff = 0;
277 LOG_TIMING ("[%1] encoder thread sleeps", boost::this_thread::get_id());
278 boost::mutex::scoped_lock lock (_mutex);
279 while (_queue.empty () && !_terminate) {
280 _empty_condition.wait (lock);
287 LOG_TIMING ("[%1] encoder thread wakes with queue of %2", boost::this_thread::get_id(), _queue.size());
288 shared_ptr<DCPVideo> vf = _queue.front ();
289 LOG_TIMING ("[%1] encoder thread pops frame %2 (%3) from queue", boost::this_thread::get_id(), vf->index(), vf->eyes ());
294 shared_ptr<EncodedData> encoded;
298 encoded = vf->encode_remotely (server.get ());
300 if (remote_backoff > 0) {
301 LOG_GENERAL ("%1 was lost, but now she is found; removing backoff", server->host_name ());
304 /* This job succeeded, so remove any backoff */
307 } catch (std::exception& e) {
308 if (remote_backoff < 60) {
310 remote_backoff += 10;
313 N_("Remote encode of %1 on %2 failed (%3); thread sleeping for %4s"),
314 vf->index(), server->host_name(), e.what(), remote_backoff
320 LOG_TIMING ("[%1] encoder thread begins local encode of %2", boost::this_thread::get_id(), vf->index());
321 encoded = vf->encode_locally ();
322 LOG_TIMING ("[%1] encoder thread finishes local encode of %2", boost::this_thread::get_id(), vf->index());
323 } catch (std::exception& e) {
324 LOG_ERROR (N_("Local encode failed (%1)"), e.what ());
329 _writer->write (encoded, vf->index (), vf->eyes ());
333 LOG_GENERAL (N_("[%1] Encoder thread pushes frame %2 back onto queue after failure"), boost::this_thread::get_id(), vf->index());
334 _queue.push_front (vf);
338 if (remote_backoff > 0) {
339 dcpomatic_sleep (remote_backoff);
342 /* The queue might not be full any more, so notify anything that is waiting on that */
344 _full_condition.notify_all ();
353 Encoder::server_found (ServerDescription s)
355 add_worker_threads (s);