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"
38 #include "dcp_video.h"
44 using std::stringstream;
50 using boost::shared_ptr;
51 using boost::weak_ptr;
52 using boost::optional;
53 using boost::scoped_array;
55 int const Encoder::_history_size = 25;
57 /** @param f Film that we are encoding */
58 Encoder::Encoder (shared_ptr<const Film> f, weak_ptr<Job> j)
61 , _video_frames_out (0)
72 /** Add a worker thread for a each thread on a remote server. Caller must hold
73 * a lock on _mutex, or know that one is not currently required to
74 * safely modify _threads.
77 Encoder::add_worker_threads (ServerDescription d)
79 for (int i = 0; i < d.threads(); ++i) {
80 _threads.push_back (new boost::thread (boost::bind (&Encoder::encoder_thread, this, d)));
85 Encoder::process_begin ()
87 for (int i = 0; i < Config::instance()->num_local_encoding_threads (); ++i) {
88 _threads.push_back (new boost::thread (boost::bind (&Encoder::encoder_thread, this, optional<ServerDescription> ())));
91 _writer.reset (new Writer (_film, _job));
92 ServerFinder::instance()->connect (boost::bind (&Encoder::server_found, this, _1));
96 Encoder::process_end ()
98 boost::mutex::scoped_lock lock (_mutex);
100 _film->log()->log (String::compose (N_("Clearing queue of %1"), _queue.size ()));
102 /* Keep waking workers until the queue is empty */
103 while (!_queue.empty ()) {
104 _film->log()->log (String::compose (N_("Waking with %1"), _queue.size ()), Log::VERBOSE);
105 _condition.notify_all ();
106 _condition.wait (lock);
111 terminate_threads ();
113 _film->log()->log (String::compose (N_("Mopping up %1"), _queue.size()));
115 /* The following sequence of events can occur in the above code:
116 1. a remote worker takes the last image off the queue
117 2. the loop above terminates
118 3. the remote worker fails to encode the image and puts it back on the queue
119 4. the remote worker is then terminated by terminate_threads
121 So just mop up anything left in the queue here.
124 for (list<shared_ptr<DCPVideoFrame> >::iterator i = _queue.begin(); i != _queue.end(); ++i) {
125 _film->log()->log (String::compose (N_("Encode left-over frame %1"), (*i)->frame ()));
127 _writer->write ((*i)->encode_locally(), (*i)->frame (), (*i)->eyes ());
129 } catch (std::exception& e) {
130 _film->log()->log (String::compose (N_("Local encode failed (%1)"), e.what ()));
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<DCPVideo> frame)
184 boost::mutex::scoped_lock lock (_mutex);
186 /* XXX: discard 3D here if required */
188 /* Wait until the queue has gone down a bit */
189 while (_queue.size() >= _threads.size() * 2 && !_terminate) {
190 TIMING ("decoder sleeps with queue of %1", _queue.size());
191 _condition.wait (lock);
192 TIMING ("decoder wakes with queue of %1", _queue.size());
200 /* Re-throw any exception raised by one of our threads. If more
201 than one has thrown an exception, only one will be rethrown, I think;
202 but then, if that happens something has gone badly wrong.
206 if (_writer->can_fake_write (_video_frames_out)) {
207 _writer->fake_write (_video_frames_out, frame->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 frame->image(PIX_FMT_RGB24, false),
218 _film->video_frame_rate(),
219 _film->j2k_bandwidth(),
225 _condition.notify_all ();
228 if (frame->eyes() != EYES_LEFT) {
234 Encoder::process_audio (shared_ptr<const AudioBuffers> data)
236 _writer->write (data);
240 Encoder::terminate_threads ()
243 boost::mutex::scoped_lock lock (_mutex);
245 _condition.notify_all ();
248 for (list<boost::thread *>::iterator i = _threads.begin(); i != _threads.end(); ++i) {
249 if ((*i)->joinable ()) {
259 Encoder::encoder_thread (optional<ServerDescription> server)
262 /* Number of seconds that we currently wait between attempts
263 to connect to the server; not relevant for localhost
266 int remote_backoff = 0;
270 TIMING ("encoder thread %1 sleeps", boost::this_thread::get_id());
271 boost::mutex::scoped_lock lock (_mutex);
272 while (_queue.empty () && !_terminate) {
273 _condition.wait (lock);
280 TIMING ("encoder thread %1 wakes with queue of %2", boost::this_thread::get_id(), _queue.size());
281 shared_ptr<DCPVideoFrame> vf = _queue.front ();
282 TIMING ("encoder thread %1 pops frame %2 (%3) from queue", boost::this_thread::get_id(), vf->frame(), vf->eyes ());
287 shared_ptr<EncodedData> encoded;
291 encoded = vf->encode_remotely (server.get ());
293 if (remote_backoff > 0) {
294 _film->log()->log (String::compose (N_("%1 was lost, but now she is found; removing backoff"), server->host_name ()));
297 /* This job succeeded, so remove any backoff */
300 } catch (std::exception& e) {
301 if (remote_backoff < 60) {
303 remote_backoff += 10;
307 N_("Remote encode of %1 on %2 failed (%3); thread sleeping for %4s"),
308 vf->frame(), server->host_name(), e.what(), remote_backoff)
314 TIMING ("encoder thread %1 begins local encode of %2", boost::this_thread::get_id(), vf->frame());
315 encoded = vf->encode_locally ();
316 TIMING ("encoder thread %1 finishes local encode of %2", boost::this_thread::get_id(), vf->frame());
317 } catch (std::exception& e) {
318 _film->log()->log (String::compose (N_("Local encode failed (%1)"), e.what ()));
323 _writer->write (encoded, vf->frame (), vf->eyes ());
328 String::compose (N_("Encoder thread %1 pushes frame %2 back onto queue after failure"), boost::this_thread::get_id(), vf->frame())
330 _queue.push_front (vf);
334 if (remote_backoff > 0) {
335 dcpomatic_sleep (remote_backoff);
339 _condition.notify_all ();
348 Encoder::server_found (ServerDescription s)
350 add_worker_threads (s);