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_frame.h"
36 #include "server_finder.h"
38 #include "player_video_frame.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);
53 using boost::shared_ptr;
54 using boost::weak_ptr;
55 using boost::optional;
56 using boost::scoped_array;
58 int const Encoder::_history_size = 25;
60 /** @param f Film that we are encoding */
61 Encoder::Encoder (shared_ptr<const Film> f, weak_ptr<Job> j)
64 , _video_frames_out (0)
67 _have_a_real_frame[EYES_BOTH] = false;
68 _have_a_real_frame[EYES_LEFT] = false;
69 _have_a_real_frame[EYES_RIGHT] = false;
77 /** Add a worker thread for a each thread on a remote server. Caller must hold
78 * a lock on _mutex, or know that one is not currently required to
79 * safely modify _threads.
82 Encoder::add_worker_threads (ServerDescription d)
84 LOG_GENERAL (N_("Adding %1 worker threads for remote %2"), d.host_name ());
85 for (int i = 0; i < d.threads(); ++i) {
86 _threads.push_back (new boost::thread (boost::bind (&Encoder::encoder_thread, this, d)));
91 Encoder::process_begin ()
93 for (int i = 0; i < Config::instance()->num_local_encoding_threads (); ++i) {
94 _threads.push_back (new boost::thread (boost::bind (&Encoder::encoder_thread, this, optional<ServerDescription> ())));
97 _writer.reset (new Writer (_film, _job));
98 ServerFinder::instance()->connect (boost::bind (&Encoder::server_found, this, _1));
102 Encoder::process_end ()
104 boost::mutex::scoped_lock lock (_mutex);
106 LOG_GENERAL (N_("Clearing queue of %1"), _queue.size ());
108 /* Keep waking workers until the queue is empty */
109 while (!_queue.empty ()) {
110 _empty_condition.notify_all ();
111 _full_condition.wait (lock);
116 terminate_threads ();
118 LOG_GENERAL (N_("Mopping up %1"), _queue.size());
120 /* The following sequence of events can occur in the above code:
121 1. a remote worker takes the last image off the queue
122 2. the loop above terminates
123 3. the remote worker fails to encode the image and puts it back on the queue
124 4. the remote worker is then terminated by terminate_threads
126 So just mop up anything left in the queue here.
129 for (list<shared_ptr<DCPVideoFrame> >::iterator i = _queue.begin(); i != _queue.end(); ++i) {
130 LOG_GENERAL (N_("Encode left-over frame %1"), (*i)->index ());
132 _writer->write ((*i)->encode_locally(), (*i)->index (), (*i)->eyes ());
134 } catch (std::exception& e) {
135 LOG_ERROR (N_("Local encode failed (%1)"), e.what ());
143 /** @return an estimate of the current number of frames we are encoding per second,
147 Encoder::current_encoding_rate () const
149 boost::mutex::scoped_lock lock (_state_mutex);
150 if (int (_time_history.size()) < _history_size) {
155 gettimeofday (&now, 0);
157 return _history_size / (seconds (now) - seconds (_time_history.back ()));
160 /** @return Number of video frames that have been sent out */
162 Encoder::video_frames_out () const
164 boost::mutex::scoped_lock (_state_mutex);
165 return _video_frames_out;
168 /** Should be called when a frame has been encoded successfully.
169 * @param n Source frame index.
172 Encoder::frame_done ()
174 boost::mutex::scoped_lock lock (_state_mutex);
177 gettimeofday (&tv, 0);
178 _time_history.push_front (tv);
179 if (int (_time_history.size()) > _history_size) {
180 _time_history.pop_back ();
185 Encoder::process_video (shared_ptr<PlayerVideoFrame> pvf, bool same)
189 boost::mutex::scoped_lock lock (_mutex);
191 /* XXX: discard 3D here if required */
193 /* Wait until the queue has gone down a bit */
194 while (_queue.size() >= _threads.size() * 2 && !_terminate) {
195 LOG_TIMING ("decoder sleeps with queue of %1", _queue.size());
196 _full_condition.wait (lock);
197 LOG_TIMING ("decoder wakes with queue of %1", _queue.size());
205 /* Re-throw any exception raised by one of our threads. If more
206 than one has thrown an exception, only one will be rethrown, I think;
207 but then, if that happens something has gone badly wrong.
211 if (_writer->can_fake_write (_video_frames_out)) {
212 _writer->fake_write (_video_frames_out, pvf->eyes ());
213 _have_a_real_frame[pvf->eyes()] = false;
215 } else if (same && _have_a_real_frame[pvf->eyes()]) {
216 /* Use the last frame that we encoded. */
217 _writer->repeat (_video_frames_out, pvf->eyes());
220 /* Queue this new frame for encoding */
221 LOG_TIMING ("adding to queue of %1", _queue.size ());
222 _queue.push_back (shared_ptr<DCPVideoFrame> (
224 pvf, _video_frames_out, _film->video_frame_rate(),
225 _film->j2k_bandwidth(), _film->resolution(), _film->log()
229 /* The queue might not be empty any more, so notify anything which is
232 _empty_condition.notify_all ();
233 _have_a_real_frame[pvf->eyes()] = true;
236 if (pvf->eyes() != EYES_LEFT) {
242 Encoder::process_audio (shared_ptr<const AudioBuffers> data)
244 _writer->write (data);
248 Encoder::terminate_threads ()
251 boost::mutex::scoped_lock lock (_mutex);
253 _full_condition.notify_all ();
254 _empty_condition.notify_all ();
257 for (list<boost::thread *>::iterator i = _threads.begin(); i != _threads.end(); ++i) {
258 if ((*i)->joinable ()) {
268 Encoder::encoder_thread (optional<ServerDescription> server)
271 /* Number of seconds that we currently wait between attempts
272 to connect to the server; not relevant for localhost
275 int remote_backoff = 0;
279 LOG_TIMING ("[%1] encoder thread sleeps", boost::this_thread::get_id());
280 boost::mutex::scoped_lock lock (_mutex);
281 while (_queue.empty () && !_terminate) {
282 _empty_condition.wait (lock);
289 LOG_TIMING ("[%1] encoder thread wakes with queue of %2", boost::this_thread::get_id(), _queue.size());
290 shared_ptr<DCPVideoFrame> vf = _queue.front ();
291 LOG_TIMING ("[%1] encoder thread pops frame %2 (%3) from queue", boost::this_thread::get_id(), vf->index(), vf->eyes ());
296 shared_ptr<EncodedData> encoded;
300 encoded = vf->encode_remotely (server.get ());
302 if (remote_backoff > 0) {
303 LOG_GENERAL ("%1 was lost, but now she is found; removing backoff", server->host_name ());
306 /* This job succeeded, so remove any backoff */
309 } catch (std::exception& e) {
310 if (remote_backoff < 60) {
312 remote_backoff += 10;
315 N_("Remote encode of %1 on %2 failed (%3); thread sleeping for %4s"),
316 vf->index(), server->host_name(), e.what(), remote_backoff
322 LOG_TIMING ("[%1] encoder thread begins local encode of %2", boost::this_thread::get_id(), vf->index());
323 encoded = vf->encode_locally ();
324 LOG_TIMING ("[%1] encoder thread finishes local encode of %2", boost::this_thread::get_id(), vf->index());
325 } catch (std::exception& e) {
326 LOG_ERROR (N_("Local encode failed (%1)"), e.what ());
331 _writer->write (encoded, vf->index (), vf->eyes ());
335 LOG_GENERAL (N_("[%1] Encoder thread pushes frame %2 back onto queue after failure"), boost::this_thread::get_id(), vf->index());
336 _queue.push_front (vf);
340 if (remote_backoff > 0) {
341 dcpomatic_sleep (remote_backoff);
344 /* The queue might not be full any more, so notify anything that is waiting on that */
346 _full_condition.notify_all ();
355 Encoder::server_found (ServerDescription s)
357 add_worker_threads (s);