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;
45 using boost::shared_ptr;
46 using boost::optional;
48 int const Encoder::_history_size = 25;
50 /** @param f Film that we are encoding */
51 Encoder::Encoder (shared_ptr<const Film> f, shared_ptr<Job> j)
54 , _video_frames_out (0)
55 , _state (TRANSCODING)
58 _have_a_real_frame[EYES_BOTH] = false;
59 _have_a_real_frame[EYES_LEFT] = false;
60 _have_a_real_frame[EYES_RIGHT] = false;
72 Encoder::process_begin ()
74 for (int i = 0; i < Config::instance()->num_local_encoding_threads (); ++i) {
75 _threads.push_back (new boost::thread (boost::bind (&Encoder::encoder_thread, this, optional<ServerDescription> ())));
78 vector<ServerDescription> servers = Config::instance()->servers ();
80 for (vector<ServerDescription>::iterator i = servers.begin(); i != servers.end(); ++i) {
81 for (int j = 0; j < i->threads (); ++j) {
82 _threads.push_back (new boost::thread (boost::bind (&Encoder::encoder_thread, this, *i)));
86 _writer.reset (new Writer (_film, _job));
91 Encoder::process_end ()
93 boost::mutex::scoped_lock lock (_mutex);
95 _film->log()->log (String::compose (N_("Clearing queue of %1"), _queue.size ()));
97 /* Keep waking workers until the queue is empty */
98 while (!_queue.empty ()) {
99 _film->log()->log (String::compose (N_("Waking with %1"), _queue.size ()), Log::VERBOSE);
100 _condition.notify_all ();
101 _condition.wait (lock);
106 terminate_threads ();
108 _film->log()->log (String::compose (N_("Mopping up %1"), _queue.size()));
110 /* The following sequence of events can occur in the above code:
111 1. a remote worker takes the last image off the queue
112 2. the loop above terminates
113 3. the remote worker fails to encode the image and puts it back on the queue
114 4. the remote worker is then terminated by terminate_threads
116 So just mop up anything left in the queue here.
119 for (list<shared_ptr<DCPVideoFrame> >::iterator i = _queue.begin(); i != _queue.end(); ++i) {
120 _film->log()->log (String::compose (N_("Encode left-over frame %1"), (*i)->frame ()));
122 _writer->write ((*i)->encode_locally(), (*i)->frame (), (*i)->eyes ());
124 } catch (std::exception& e) {
125 _film->log()->log (String::compose (N_("Local encode failed (%1)"), e.what ()));
130 boost::mutex::scoped_lock lm (_state_mutex);
138 /** @return an estimate of the current number of frames we are encoding per second,
142 Encoder::current_encoding_rate () const
144 boost::mutex::scoped_lock lock (_state_mutex);
145 if (int (_time_history.size()) < _history_size) {
150 gettimeofday (&now, 0);
152 return _history_size / (seconds (now) - seconds (_time_history.back ()));
155 /** @return Number of video frames that have been sent out */
157 Encoder::video_frames_out () const
159 boost::mutex::scoped_lock (_state_mutex);
160 return _video_frames_out;
163 /** Should be called when a frame has been encoded successfully.
164 * @param n Source frame index.
167 Encoder::frame_done ()
169 boost::mutex::scoped_lock lock (_state_mutex);
172 gettimeofday (&tv, 0);
173 _time_history.push_front (tv);
174 if (int (_time_history.size()) > _history_size) {
175 _time_history.pop_back ();
180 Encoder::process_video (shared_ptr<const Image> image, Eyes eyes, ColourConversion conversion, bool same)
182 boost::mutex::scoped_lock lock (_mutex);
184 /* XXX: discard 3D here if required */
186 /* Wait until the queue has gone down a bit */
187 while (_queue.size() >= _threads.size() * 2 && !_terminate) {
188 TIMING ("decoder sleeps with queue of %1", _queue.size());
189 _condition.wait (lock);
190 TIMING ("decoder wakes with queue of %1", _queue.size());
197 if (_writer->thrown ()) {
201 if (_writer->can_fake_write (_video_frames_out)) {
202 _writer->fake_write (_video_frames_out, eyes);
203 _have_a_real_frame[eyes] = false;
205 } else if (same && _have_a_real_frame[eyes]) {
206 /* Use the last frame that we encoded. */
207 _writer->repeat (_video_frames_out, eyes);
210 /* Queue this new frame for encoding */
211 TIMING ("adding to queue of %1", _queue.size ());
212 _queue.push_back (shared_ptr<DCPVideoFrame> (
214 image, _video_frames_out, eyes, conversion, _film->video_frame_rate(),
215 _film->j2k_bandwidth(), _film->log()
219 _condition.notify_all ();
220 _have_a_real_frame[eyes] = true;
223 if (eyes != EYES_LEFT) {
229 Encoder::process_audio (shared_ptr<const AudioBuffers> data)
231 _writer->write (data);
235 Encoder::terminate_threads ()
237 boost::mutex::scoped_lock lock (_mutex);
239 _condition.notify_all ();
242 for (list<boost::thread *>::iterator i = _threads.begin(); i != _threads.end(); ++i) {
243 if ((*i)->joinable ()) {
253 Encoder::encoder_thread (optional<ServerDescription> server)
255 /* Number of seconds that we currently wait between attempts
256 to connect to the server; not relevant for localhost
259 int remote_backoff = 0;
263 TIMING ("encoder thread %1 sleeps", boost::this_thread::get_id());
264 boost::mutex::scoped_lock lock (_mutex);
265 while (_queue.empty () && !_terminate) {
266 _condition.wait (lock);
273 TIMING ("encoder thread %1 wakes with queue of %2", boost::this_thread::get_id(), _queue.size());
274 shared_ptr<DCPVideoFrame> vf = _queue.front ();
275 _film->log()->log (String::compose (N_("Encoder thread %1 pops frame %2 (%3) from queue"), boost::this_thread::get_id(), vf->frame(), vf->eyes ()));
280 shared_ptr<EncodedData> encoded;
284 encoded = vf->encode_remotely (server.get ());
286 if (remote_backoff > 0) {
287 _film->log()->log (String::compose (N_("%1 was lost, but now she is found; removing backoff"), server->host_name ()));
290 /* This job succeeded, so remove any backoff */
293 } catch (std::exception& e) {
294 if (remote_backoff < 60) {
296 remote_backoff += 10;
300 N_("Remote encode of %1 on %2 failed (%3); thread sleeping for %4s"),
301 vf->frame(), server->host_name(), e.what(), remote_backoff)
307 TIMING ("encoder thread %1 begins local encode of %2", boost::this_thread::get_id(), vf->frame());
308 encoded = vf->encode_locally ();
309 TIMING ("encoder thread %1 finishes local encode of %2", boost::this_thread::get_id(), vf->frame());
310 } catch (std::exception& e) {
311 _film->log()->log (String::compose (N_("Local encode failed (%1)"), e.what ()));
316 _writer->write (encoded, vf->frame (), vf->eyes ());
321 String::compose (N_("Encoder thread %1 pushes frame %2 back onto queue after failure"), boost::this_thread::get_id(), vf->frame())
323 _queue.push_front (vf);
327 if (remote_backoff > 0) {
328 dcpomatic_sleep (remote_backoff);
332 _condition.notify_all ();