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) {
82 _threads.push_back (new boost::thread (boost::bind (&Encoder::encoder_thread, this, d)));
87 Encoder::process_begin ()
89 for (int i = 0; i < Config::instance()->num_local_encoding_threads (); ++i) {
90 _threads.push_back (new boost::thread (boost::bind (&Encoder::encoder_thread, this, optional<ServerDescription> ())));
93 vector<ServerDescription> servers = Config::instance()->servers ();
95 for (vector<ServerDescription>::iterator i = servers.begin(); i != servers.end(); ++i) {
96 add_worker_threads (*i);
99 _writer.reset (new Writer (_film, _job));
100 ServerFinder::instance()->connect (boost::bind (&Encoder::server_found, this, _1));
105 Encoder::process_end ()
107 boost::mutex::scoped_lock lock (_mutex);
109 _film->log()->log (String::compose (N_("Clearing queue of %1"), _queue.size ()));
111 /* Keep waking workers until the queue is empty */
112 while (!_queue.empty ()) {
113 _film->log()->log (String::compose (N_("Waking with %1"), _queue.size ()), Log::VERBOSE);
114 _condition.notify_all ();
115 _condition.wait (lock);
120 terminate_threads ();
122 _film->log()->log (String::compose (N_("Mopping up %1"), _queue.size()));
124 /* The following sequence of events can occur in the above code:
125 1. a remote worker takes the last image off the queue
126 2. the loop above terminates
127 3. the remote worker fails to encode the image and puts it back on the queue
128 4. the remote worker is then terminated by terminate_threads
130 So just mop up anything left in the queue here.
133 for (list<shared_ptr<DCPVideoFrame> >::iterator i = _queue.begin(); i != _queue.end(); ++i) {
134 _film->log()->log (String::compose (N_("Encode left-over frame %1"), (*i)->frame ()));
136 _writer->write ((*i)->encode_locally(), (*i)->frame (), (*i)->eyes ());
138 } catch (std::exception& e) {
139 _film->log()->log (String::compose (N_("Local encode failed (%1)"), e.what ()));
147 /** @return an estimate of the current number of frames we are encoding per second,
151 Encoder::current_encoding_rate () const
153 boost::mutex::scoped_lock lock (_state_mutex);
154 if (int (_time_history.size()) < _history_size) {
159 gettimeofday (&now, 0);
161 return _history_size / (seconds (now) - seconds (_time_history.back ()));
164 /** @return Number of video frames that have been sent out */
166 Encoder::video_frames_out () const
168 boost::mutex::scoped_lock (_state_mutex);
169 return _video_frames_out;
172 /** Should be called when a frame has been encoded successfully.
173 * @param n Source frame index.
176 Encoder::frame_done ()
178 boost::mutex::scoped_lock lock (_state_mutex);
181 gettimeofday (&tv, 0);
182 _time_history.push_front (tv);
183 if (int (_time_history.size()) > _history_size) {
184 _time_history.pop_back ();
189 Encoder::process_video (shared_ptr<const Image> image, Eyes eyes, ColourConversion conversion, bool same)
191 boost::mutex::scoped_lock lock (_mutex);
193 /* XXX: discard 3D here if required */
195 /* Wait until the queue has gone down a bit */
196 while (_queue.size() >= _threads.size() * 2 && !_terminate) {
197 TIMING ("decoder sleeps with queue of %1", _queue.size());
198 _condition.wait (lock);
199 TIMING ("decoder wakes with queue of %1", _queue.size());
206 if (_writer->thrown ()) {
210 if (_writer->can_fake_write (_video_frames_out)) {
211 _writer->fake_write (_video_frames_out, eyes);
212 _have_a_real_frame[eyes] = false;
214 } else if (same && _have_a_real_frame[eyes]) {
215 /* Use the last frame that we encoded. */
216 _writer->repeat (_video_frames_out, eyes);
219 /* Queue this new frame for encoding */
220 TIMING ("adding to queue of %1", _queue.size ());
221 _queue.push_back (shared_ptr<DCPVideoFrame> (
223 image, _video_frames_out, eyes, conversion, _film->video_frame_rate(),
224 _film->j2k_bandwidth(), _film->log()
228 _condition.notify_all ();
229 _have_a_real_frame[eyes] = true;
232 if (eyes != EYES_LEFT) {
238 Encoder::process_audio (shared_ptr<const AudioBuffers> data)
240 _writer->write (data);
244 Encoder::terminate_threads ()
247 boost::mutex::scoped_lock lock (_mutex);
249 _condition.notify_all ();
252 for (list<boost::thread *>::iterator i = _threads.begin(); i != _threads.end(); ++i) {
253 if ((*i)->joinable ()) {
263 Encoder::encoder_thread (optional<ServerDescription> server)
265 /* Number of seconds that we currently wait between attempts
266 to connect to the server; not relevant for localhost
269 int remote_backoff = 0;
273 TIMING ("encoder thread %1 sleeps", boost::this_thread::get_id());
274 boost::mutex::scoped_lock lock (_mutex);
275 while (_queue.empty () && !_terminate) {
276 _condition.wait (lock);
283 TIMING ("encoder thread %1 wakes with queue of %2", boost::this_thread::get_id(), _queue.size());
284 shared_ptr<DCPVideoFrame> vf = _queue.front ();
285 _film->log()->log (String::compose (N_("Encoder thread %1 pops frame %2 (%3) from queue"), boost::this_thread::get_id(), vf->frame(), vf->eyes ()));
290 shared_ptr<EncodedData> encoded;
294 encoded = vf->encode_remotely (server.get ());
296 if (remote_backoff > 0) {
297 _film->log()->log (String::compose (N_("%1 was lost, but now she is found; removing backoff"), server->host_name ()));
300 /* This job succeeded, so remove any backoff */
303 } catch (std::exception& e) {
304 if (remote_backoff < 60) {
306 remote_backoff += 10;
310 N_("Remote encode of %1 on %2 failed (%3); thread sleeping for %4s"),
311 vf->frame(), server->host_name(), e.what(), remote_backoff)
317 TIMING ("encoder thread %1 begins local encode of %2", boost::this_thread::get_id(), vf->frame());
318 encoded = vf->encode_locally ();
319 TIMING ("encoder thread %1 finishes local encode of %2", boost::this_thread::get_id(), vf->frame());
320 } catch (std::exception& e) {
321 _film->log()->log (String::compose (N_("Local encode failed (%1)"), e.what ()));
326 _writer->write (encoded, vf->frame (), vf->eyes ());
331 String::compose (N_("Encoder thread %1 pushes frame %2 back onto queue after failure"), boost::this_thread::get_id(), vf->frame())
333 _queue.push_front (vf);
337 if (remote_backoff > 0) {
338 dcpomatic_sleep (remote_backoff);
342 _condition.notify_all ();
347 Encoder::server_found (ServerDescription s)
349 add_worker_threads (s);