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.
25 #include <boost/lambda/lambda.hpp>
26 #include <libcxml/cxml.h>
32 #include "dcp_video_frame.h"
36 #include "server_finder.h"
42 using std::stringstream;
48 using boost::shared_ptr;
49 using boost::optional;
50 using boost::scoped_array;
52 int const Encoder::_history_size = 25;
54 /** @param f Film that we are encoding */
55 Encoder::Encoder (shared_ptr<const Film> f, shared_ptr<Job> j)
58 , _video_frames_out (0)
61 _have_a_real_frame[EYES_BOTH] = false;
62 _have_a_real_frame[EYES_LEFT] = false;
63 _have_a_real_frame[EYES_RIGHT] = false;
74 /** Add a worker thread for a each thread on a remote server. Caller must hold
75 * a lock on _mutex, or know that one is not currently required to
76 * safely modify _threads.
79 Encoder::add_worker_threads (ServerDescription d)
81 for (int i = 0; i < d.threads(); ++i) {
83 make_pair (d, new boost::thread (boost::bind (&Encoder::encoder_thread, this, d)))
89 Encoder::process_begin ()
91 for (int i = 0; i < Config::instance()->num_local_encoding_threads (); ++i) {
94 optional<ServerDescription> (),
95 new boost::thread (boost::bind (&Encoder::encoder_thread, this, optional<ServerDescription> ()))
100 vector<ServerDescription> servers = Config::instance()->servers ();
102 for (vector<ServerDescription>::iterator i = servers.begin(); i != servers.end(); ++i) {
103 add_worker_threads (*i);
106 _writer.reset (new Writer (_film, _job));
107 _server_finder.reset (new ServerFinder ());
108 _server_finder->ServerFound.connect (boost::bind (&Encoder::server_found, this, _1));
113 Encoder::process_end ()
115 boost::mutex::scoped_lock lock (_mutex);
117 _film->log()->log (String::compose (N_("Clearing queue of %1"), _queue.size ()));
119 /* Keep waking workers until the queue is empty */
120 while (!_queue.empty ()) {
121 _film->log()->log (String::compose (N_("Waking with %1"), _queue.size ()), Log::VERBOSE);
122 _condition.notify_all ();
123 _condition.wait (lock);
128 terminate_threads ();
130 _film->log()->log (String::compose (N_("Mopping up %1"), _queue.size()));
132 /* The following sequence of events can occur in the above code:
133 1. a remote worker takes the last image off the queue
134 2. the loop above terminates
135 3. the remote worker fails to encode the image and puts it back on the queue
136 4. the remote worker is then terminated by terminate_threads
138 So just mop up anything left in the queue here.
141 for (list<shared_ptr<DCPVideoFrame> >::iterator i = _queue.begin(); i != _queue.end(); ++i) {
142 _film->log()->log (String::compose (N_("Encode left-over frame %1"), (*i)->frame ()));
144 _writer->write ((*i)->encode_locally(), (*i)->frame (), (*i)->eyes ());
146 } catch (std::exception& e) {
147 _film->log()->log (String::compose (N_("Local encode failed (%1)"), e.what ()));
155 /** @return an estimate of the current number of frames we are encoding per second,
159 Encoder::current_encoding_rate () const
161 boost::mutex::scoped_lock lock (_state_mutex);
162 if (int (_time_history.size()) < _history_size) {
167 gettimeofday (&now, 0);
169 return _history_size / (seconds (now) - seconds (_time_history.back ()));
172 /** @return Number of video frames that have been sent out */
174 Encoder::video_frames_out () const
176 boost::mutex::scoped_lock (_state_mutex);
177 return _video_frames_out;
180 /** Should be called when a frame has been encoded successfully.
181 * @param n Source frame index.
184 Encoder::frame_done ()
186 boost::mutex::scoped_lock lock (_state_mutex);
189 gettimeofday (&tv, 0);
190 _time_history.push_front (tv);
191 if (int (_time_history.size()) > _history_size) {
192 _time_history.pop_back ();
197 Encoder::process_video (shared_ptr<const Image> image, Eyes eyes, ColourConversion conversion, bool same)
199 boost::mutex::scoped_lock lock (_mutex);
201 /* XXX: discard 3D here if required */
203 /* Wait until the queue has gone down a bit */
204 while (_queue.size() >= _threads.size() * 2 && !_terminate) {
205 TIMING ("decoder sleeps with queue of %1", _queue.size());
206 _condition.wait (lock);
207 TIMING ("decoder wakes with queue of %1", _queue.size());
214 if (_writer->thrown ()) {
218 if (_writer->can_fake_write (_video_frames_out)) {
219 _writer->fake_write (_video_frames_out, eyes);
220 _have_a_real_frame[eyes] = false;
222 } else if (same && _have_a_real_frame[eyes]) {
223 /* Use the last frame that we encoded. */
224 _writer->repeat (_video_frames_out, eyes);
227 /* Queue this new frame for encoding */
228 TIMING ("adding to queue of %1", _queue.size ());
229 _queue.push_back (shared_ptr<DCPVideoFrame> (
231 image, _video_frames_out, eyes, conversion, _film->video_frame_rate(),
232 _film->j2k_bandwidth(), _film->log()
236 _condition.notify_all ();
237 _have_a_real_frame[eyes] = true;
240 if (eyes != EYES_LEFT) {
246 Encoder::process_audio (shared_ptr<const AudioBuffers> data)
248 _writer->write (data);
252 Encoder::terminate_threads ()
255 boost::mutex::scoped_lock lock (_mutex);
257 _condition.notify_all ();
260 for (ThreadList::iterator i = _threads.begin(); i != _threads.end(); ++i) {
261 if (i->second->joinable ()) {
271 Encoder::encoder_thread (optional<ServerDescription> server)
273 /* Number of seconds that we currently wait between attempts
274 to connect to the server; not relevant for localhost
277 int remote_backoff = 0;
281 TIMING ("encoder thread %1 sleeps", boost::this_thread::get_id());
282 boost::mutex::scoped_lock lock (_mutex);
283 while (_queue.empty () && !_terminate) {
284 _condition.wait (lock);
291 TIMING ("encoder thread %1 wakes with queue of %2", boost::this_thread::get_id(), _queue.size());
292 shared_ptr<DCPVideoFrame> vf = _queue.front ();
293 _film->log()->log (String::compose (N_("Encoder thread %1 pops frame %2 (%3) from queue"), boost::this_thread::get_id(), vf->frame(), vf->eyes ()));
298 shared_ptr<EncodedData> encoded;
302 encoded = vf->encode_remotely (server.get ());
304 if (remote_backoff > 0) {
305 _film->log()->log (String::compose (N_("%1 was lost, but now she is found; removing backoff"), server->host_name ()));
308 /* This job succeeded, so remove any backoff */
311 } catch (std::exception& e) {
312 if (remote_backoff < 60) {
314 remote_backoff += 10;
318 N_("Remote encode of %1 on %2 failed (%3); thread sleeping for %4s"),
319 vf->frame(), server->host_name(), e.what(), remote_backoff)
325 TIMING ("encoder thread %1 begins local encode of %2", boost::this_thread::get_id(), vf->frame());
326 encoded = vf->encode_locally ();
327 TIMING ("encoder thread %1 finishes local encode of %2", boost::this_thread::get_id(), vf->frame());
328 } catch (std::exception& e) {
329 _film->log()->log (String::compose (N_("Local encode failed (%1)"), e.what ()));
334 _writer->write (encoded, vf->frame (), vf->eyes ());
339 String::compose (N_("Encoder thread %1 pushes frame %2 back onto queue after failure"), boost::this_thread::get_id(), vf->frame())
341 _queue.push_front (vf);
345 if (remote_backoff > 0) {
346 dcpomatic_sleep (remote_backoff);
350 _condition.notify_all ();
355 Encoder::server_found (ServerDescription s)
357 /* See if we already know about this server */
358 boost::mutex::scoped_lock lm (_mutex);
359 ThreadList::iterator i = _threads.begin();
360 while (i != _threads.end() && (!i->first || i->first.get().host_name() != s.host_name())) {
364 if (i == _threads.end ()) {
365 add_worker_threads (s);