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 /** @file src/encoder.h
21 * @brief Parent class for classes which can encode video and audio frames.
30 #include "dcp_video_frame.h"
39 using std::stringstream;
44 using boost::shared_ptr;
45 using boost::optional;
47 int const Encoder::_history_size = 25;
49 /** @param f Film that we are encoding */
50 Encoder::Encoder (shared_ptr<Film> f, shared_ptr<Job> j)
53 , _video_frames_out (0)
54 , _have_a_real_frame (false)
69 Encoder::process_begin ()
71 for (int i = 0; i < Config::instance()->num_local_encoding_threads (); ++i) {
72 _threads.push_back (new boost::thread (boost::bind (&Encoder::encoder_thread, this, (ServerDescription *) 0)));
75 vector<ServerDescription*> servers = Config::instance()->servers ();
77 for (vector<ServerDescription*>::iterator i = servers.begin(); i != servers.end(); ++i) {
78 for (int j = 0; j < (*i)->threads (); ++j) {
79 _threads.push_back (new boost::thread (boost::bind (&Encoder::encoder_thread, this, *i)));
83 _writer.reset (new Writer (_film, _job));
88 Encoder::process_end ()
90 boost::mutex::scoped_lock lock (_mutex);
92 _film->log()->log (String::compose (N_("Clearing queue of %1"), _queue.size ()));
94 /* Keep waking workers until the queue is empty */
95 while (!_queue.empty ()) {
96 _film->log()->log (String::compose (N_("Waking with %1"), _queue.size ()), Log::VERBOSE);
97 _condition.notify_all ();
98 _condition.wait (lock);
103 terminate_threads ();
105 _film->log()->log (String::compose (N_("Mopping up %1"), _queue.size()));
107 /* The following sequence of events can occur in the above code:
108 1. a remote worker takes the last image off the queue
109 2. the loop above terminates
110 3. the remote worker fails to encode the image and puts it back on the queue
111 4. the remote worker is then terminated by terminate_threads
113 So just mop up anything left in the queue here.
116 for (list<shared_ptr<DCPVideoFrame> >::iterator i = _queue.begin(); i != _queue.end(); ++i) {
117 _film->log()->log (String::compose (N_("Encode left-over frame %1"), (*i)->frame ()));
119 _writer->write ((*i)->encode_locally(), (*i)->frame ());
121 } catch (std::exception& e) {
122 _film->log()->log (String::compose (N_("Local encode failed (%1)"), e.what ()));
130 /** @return an estimate of the current number of frames we are encoding per second,
134 Encoder::current_encoding_rate () const
136 boost::mutex::scoped_lock lock (_history_mutex);
137 if (int (_time_history.size()) < _history_size) {
142 gettimeofday (&now, 0);
144 return _history_size / (seconds (now) - seconds (_time_history.back ()));
147 /** @return Number of video frames that have been sent out */
149 Encoder::video_frames_out () const
151 boost::mutex::scoped_lock (_history_mutex);
152 return _video_frames_out;
155 /** Should be called when a frame has been encoded successfully.
156 * @param n Source frame index.
159 Encoder::frame_done ()
161 boost::mutex::scoped_lock lock (_history_mutex);
164 gettimeofday (&tv, 0);
165 _time_history.push_front (tv);
166 if (int (_time_history.size()) > _history_size) {
167 _time_history.pop_back ();
172 Encoder::process_video (shared_ptr<const Image> image, bool same, Time)
174 boost::mutex::scoped_lock lock (_mutex);
176 /* Wait until the queue has gone down a bit */
177 while (_queue.size() >= _threads.size() * 2 && !_terminate) {
178 TIMING ("decoder sleeps with queue of %1", _queue.size());
179 _condition.wait (lock);
180 TIMING ("decoder wakes with queue of %1", _queue.size());
187 if (_writer->thrown ()) {
191 if (_writer->can_fake_write (_video_frames_out)) {
192 _writer->fake_write (_video_frames_out);
193 _have_a_real_frame = false;
195 } else if (same && _have_a_real_frame) {
196 /* Use the last frame that we encoded. */
197 _writer->repeat (_video_frames_out);
200 /* Queue this new frame for encoding */
201 TIMING ("adding to queue of %1", _queue.size ());
203 _queue.push_back (shared_ptr<DCPVideoFrame> (
205 image, _video_frames_out, _film->dcp_video_frame_rate(),
206 _film->colour_lut(), _film->j2k_bandwidth(), _film->log()
210 _condition.notify_all ();
211 _have_a_real_frame = true;
218 Encoder::process_audio (shared_ptr<const AudioBuffers> data, Time)
220 _writer->write (data);
224 Encoder::terminate_threads ()
226 boost::mutex::scoped_lock lock (_mutex);
228 _condition.notify_all ();
231 for (list<boost::thread *>::iterator i = _threads.begin(); i != _threads.end(); ++i) {
232 if ((*i)->joinable ()) {
240 Encoder::encoder_thread (ServerDescription* server)
242 /* Number of seconds that we currently wait between attempts
243 to connect to the server; not relevant for localhost
246 int remote_backoff = 0;
250 TIMING ("encoder thread %1 sleeps", boost::this_thread::get_id());
251 boost::mutex::scoped_lock lock (_mutex);
252 while (_queue.empty () && !_terminate) {
253 _condition.wait (lock);
260 TIMING ("encoder thread %1 wakes with queue of %2", boost::this_thread::get_id(), _queue.size());
261 shared_ptr<DCPVideoFrame> vf = _queue.front ();
262 _film->log()->log (String::compose (N_("Encoder thread %1 pops frame %2 from queue"), boost::this_thread::get_id(), vf->frame()), Log::VERBOSE);
267 shared_ptr<EncodedData> encoded;
271 encoded = vf->encode_remotely (server);
273 if (remote_backoff > 0) {
274 _film->log()->log (String::compose (N_("%1 was lost, but now she is found; removing backoff"), server->host_name ()));
277 /* This job succeeded, so remove any backoff */
280 } catch (std::exception& e) {
281 if (remote_backoff < 60) {
283 remote_backoff += 10;
287 N_("Remote encode of %1 on %2 failed (%3); thread sleeping for %4s"),
288 vf->frame(), server->host_name(), e.what(), remote_backoff)
294 TIMING ("encoder thread %1 begins local encode of %2", boost::this_thread::get_id(), vf->frame());
295 encoded = vf->encode_locally ();
296 TIMING ("encoder thread %1 finishes local encode of %2", boost::this_thread::get_id(), vf->frame());
297 } catch (std::exception& e) {
298 _film->log()->log (String::compose (N_("Local encode failed (%1)"), e.what ()));
303 _writer->write (encoded, vf->frame ());
308 String::compose (N_("Encoder thread %1 pushes frame %2 back onto queue after failure"), boost::this_thread::get_id(), vf->frame())
310 _queue.push_front (vf);
314 if (remote_backoff > 0) {
315 dcpomatic_sleep (remote_backoff);
319 _condition.notify_all ();