Attempt to tidy up internal APIs slightly.
[dcpomatic.git] / src / lib / encoder.cc
index 9ec817604a34e09ca98dc0c8dfb24a5f1606a441..f8a2ee3bde878c117f9948015d23951082d82fa5 100644 (file)
@@ -45,6 +45,7 @@
 #define LOG_GENERAL_NC(...) _film->log()->log (__VA_ARGS__, LogEntry::TYPE_GENERAL);
 #define LOG_ERROR(...) _film->log()->log (String::compose (__VA_ARGS__), LogEntry::TYPE_ERROR);
 #define LOG_TIMING(...) _film->log()->log (String::compose (__VA_ARGS__), LogEntry::TYPE_TIMING);
+#define LOG_DEBUG_ENCODE(...) _film->log()->log (String::compose (__VA_ARGS__), LogEntry::TYPE_DEBUG_ENCODE);
 
 using std::list;
 using std::cout;
@@ -53,7 +54,7 @@ using boost::weak_ptr;
 using boost::optional;
 using dcp::Data;
 
-int const Encoder::_history_size = 25;
+int const Encoder::_history_size = 200;
 
 /** @param f Film that we are encoding */
 Encoder::Encoder (shared_ptr<const Film> film, shared_ptr<Writer> writer)
@@ -78,12 +79,10 @@ Encoder::~Encoder ()
 void
 Encoder::begin ()
 {
-       if (!EncodeServerFinder::instance()->disabled ()) {
-               weak_ptr<Encoder> wp = shared_from_this ();
-               _server_found_connection = EncodeServerFinder::instance()->ServersListChanged.connect (
-                       boost::bind (&Encoder::call_servers_list_changed, wp)
-                       );
-       }
+       weak_ptr<Encoder> wp = shared_from_this ();
+       _server_found_connection = EncodeServerFinder::instance()->ServersListChanged.connect (
+               boost::bind (&Encoder::call_servers_list_changed, wp)
+               );
 }
 
 /* We don't want the servers-list-changed callback trying to do things
@@ -166,7 +165,11 @@ Encoder::current_encoding_rate () const
 int
 Encoder::video_frames_enqueued () const
 {
-       return _last_player_video->time().frames_floor (_film->video_frame_rate ());
+       if (!_last_player_video_time) {
+               return 0;
+       }
+
+       return _last_player_video_time->frames_floor (_film->video_frame_rate ());
 }
 
 /** Should be called when a frame has been encoded successfully.
@@ -185,13 +188,13 @@ Encoder::frame_done ()
        }
 }
 
-/** Called to start encoding of the next video frame in the DCP.  This is called in order,
+/** Called to request encoding of the next video frame in the DCP.  This is called in order,
  *  so each time the supplied frame is the one after the previous one.
  *  pv represents one video frame, and could be empty if there is nothing to encode
  *  for this DCP frame.
  */
 void
-Encoder::encode (shared_ptr<PlayerVideo> pv)
+Encoder::encode (shared_ptr<PlayerVideo> pv, DCPTime time)
 {
        _waker.nudge ();
 
@@ -203,11 +206,13 @@ Encoder::encode (shared_ptr<PlayerVideo> pv)
 
        boost::mutex::scoped_lock queue_lock (_queue_mutex);
 
-       /* Wait until the queue has gone down a bit */
-       while (_queue.size() >= threads * 2) {
-               LOG_TIMING ("decoder-sleep queue=%1", _queue.size());
+       /* Wait until the queue has gone down a bit.  Allow one thing in the queue even
+          when there are no threads.
+       */
+       while (_queue.size() >= (threads * 2) + 1) {
+               LOG_TIMING ("decoder-sleep queue=%1 threads=%2", _queue.size(), threads);
                _full_condition.wait (queue_lock);
-               LOG_TIMING ("decoder-wake queue=%1", _queue.size());
+               LOG_TIMING ("decoder-wake queue=%1 threads=%2", _queue.size(), threads);
        }
 
        _writer->rethrow ();
@@ -217,18 +222,22 @@ Encoder::encode (shared_ptr<PlayerVideo> pv)
        */
        rethrow ();
 
-       Frame const position = pv->time().frames_floor(_film->video_frame_rate());
+       Frame const position = time.frames_floor(_film->video_frame_rate());
 
        if (_writer->can_fake_write (position)) {
                /* We can fake-write this frame */
+               LOG_DEBUG_ENCODE("Frame @ %1 FAKE", to_string(pv->time()));
                _writer->fake_write (position, pv->eyes ());
                frame_done ();
        } else if (pv->has_j2k ()) {
+               LOG_DEBUG_ENCODE("Frame @ %1 J2K", to_string(pv->time()));
                /* This frame already has JPEG2000 data, so just write it */
                _writer->write (pv->j2k(), position, pv->eyes ());
        } else if (_last_player_video && _writer->can_repeat(position) && pv->same (_last_player_video)) {
+               LOG_DEBUG_ENCODE("Frame @ %1 REPEAT", to_string(pv->time()));
                _writer->repeat (position, pv->eyes ());
        } else {
+               LOG_DEBUG_ENCODE("Frame @ %1 ENCODE", to_string(pv->time()));
                /* Queue this new frame for encoding */
                LOG_TIMING ("add-frame-to-queue queue=%1", _queue.size ());
                _queue.push_back (shared_ptr<DCPVideo> (
@@ -249,6 +258,7 @@ Encoder::encode (shared_ptr<PlayerVideo> pv)
        }
 
        _last_player_video = pv;
+       _last_player_video_time = time;
 }
 
 void
@@ -279,9 +289,9 @@ Encoder::encoder_thread (optional<EncodeServerDescription> server)
 try
 {
        if (server) {
-               LOG_TIMING ("start-encoder-thread thread=%1 server=%2", boost::this_thread::get_id (), server->host_name ());
+               LOG_TIMING ("start-encoder-thread thread=%1 server=%2", thread_id (), server->host_name ());
        } else {
-               LOG_TIMING ("start-encoder-thread thread=%1 server=localhost", boost::this_thread::get_id ());
+               LOG_TIMING ("start-encoder-thread thread=%1 server=localhost", thread_id ());
        }
 
        /* Number of seconds that we currently wait between attempts
@@ -292,65 +302,75 @@ try
 
        while (true) {
 
-               LOG_TIMING ("encoder-sleep thread=%1", boost::this_thread::get_id());
+               LOG_TIMING ("encoder-sleep thread=%1", thread_id ());
                boost::mutex::scoped_lock lock (_queue_mutex);
                while (_queue.empty ()) {
                        _empty_condition.wait (lock);
                }
 
-               LOG_TIMING ("encoder-wake thread=%1 queue=%2", boost::this_thread::get_id(), _queue.size());
+               LOG_TIMING ("encoder-wake thread=%1 queue=%2", thread_id(), _queue.size());
                shared_ptr<DCPVideo> vf = _queue.front ();
-               LOG_TIMING ("encoder-pop thread=%1 frame=%2 eyes=%3", boost::this_thread::get_id(), vf->index(), vf->eyes ());
-               _queue.pop_front ();
 
-               lock.unlock ();
+               /* We're about to commit to either encoding this frame or putting it back onto the queue,
+                  so we must not be interrupted until one or other of these things have happened.  This
+                  block has thread interruption disabled.
+               */
+               {
+                       boost::this_thread::disable_interruption dis;
 
-               optional<Data> encoded;
+                       LOG_TIMING ("encoder-pop thread=%1 frame=%2 eyes=%3", thread_id(), vf->index(), (int) vf->eyes ());
+                       _queue.pop_front ();
 
-               /* We need to encode this input */
-               if (server) {
-                       try {
-                               encoded = vf->encode_remotely (server.get ());
+                       lock.unlock ();
 
-                               if (remote_backoff > 0) {
-                                       LOG_GENERAL ("%1 was lost, but now she is found; removing backoff", server->host_name ());
+                       optional<Data> encoded;
+
+                       /* We need to encode this input */
+                       if (server) {
+                               try {
+                                       encoded = vf->encode_remotely (server.get ());
+
+                                       if (remote_backoff > 0) {
+                                               LOG_GENERAL ("%1 was lost, but now she is found; removing backoff", server->host_name ());
+                                       }
+
+                                       /* This job succeeded, so remove any backoff */
+                                       remote_backoff = 0;
+
+                               } catch (std::exception& e) {
+                                       if (remote_backoff < 60) {
+                                               /* back off more */
+                                               remote_backoff += 10;
+                                       }
+                                       LOG_ERROR (
+                                               N_("Remote encode of %1 on %2 failed (%3); thread sleeping for %4s"),
+                                               vf->index(), server->host_name(), e.what(), remote_backoff
+                                               );
                                }
 
-                               /* This job succeeded, so remove any backoff */
-                               remote_backoff = 0;
-
-                       } catch (std::exception& e) {
-                               if (remote_backoff < 60) {
-                                       /* back off more */
-                                       remote_backoff += 10;
+                       } else {
+                               try {
+                                       LOG_TIMING ("start-local-encode thread=%1 frame=%2", thread_id(), vf->index());
+                                       encoded = vf->encode_locally (boost::bind (&Log::dcp_log, _film->log().get(), _1, _2));
+                                       LOG_TIMING ("finish-local-encode thread=%1 frame=%2", thread_id(), vf->index());
+                               } catch (std::exception& e) {
+                                       /* This is very bad, so don't cope with it, just pass it on */
+                                       LOG_ERROR (N_("Local encode failed (%1)"), e.what ());
+                                       throw;
                                }
-                               LOG_ERROR (
-                                       N_("Remote encode of %1 on %2 failed (%3); thread sleeping for %4s"),
-                                       vf->index(), server->host_name(), e.what(), remote_backoff
-                                       );
                        }
 
-               } else {
-                       try {
-                               LOG_TIMING ("start-local-encode thread=%1 frame=%2", boost::this_thread::get_id(), vf->index());
-                               encoded = vf->encode_locally (boost::bind (&Log::dcp_log, _film->log().get(), _1, _2));
-                               LOG_TIMING ("finish-local-encode thread=%1 frame=%2", boost::this_thread::get_id(), vf->index());
-                       } catch (std::exception& e) {
-                               LOG_ERROR (N_("Local encode failed (%1)"), e.what ());
-                               throw;
+                       if (encoded) {
+                               _writer->write (encoded.get(), vf->index (), vf->eyes ());
+                               frame_done ();
+                       } else {
+                               lock.lock ();
+                               LOG_GENERAL (N_("[%1] Encoder thread pushes frame %2 back onto queue after failure"), thread_id(), vf->index());
+                               _queue.push_front (vf);
+                               lock.unlock ();
                        }
                }
 
-               if (encoded) {
-                       _writer->write (encoded.get(), vf->index (), vf->eyes ());
-                       frame_done ();
-               } else {
-                       lock.lock ();
-                       LOG_GENERAL (N_("[%1] Encoder thread pushes frame %2 back onto queue after failure"), boost::this_thread::get_id(), vf->index());
-                       _queue.push_front (vf);
-                       lock.unlock ();
-               }
-
                if (remote_backoff > 0) {
                        boost::this_thread::sleep (boost::posix_time::seconds (remote_backoff));
                }
@@ -360,6 +380,10 @@ try
                _full_condition.notify_all ();
        }
 }
+catch (boost::thread_interrupted& e) {
+       /* Ignore these and just stop the thread */
+       _full_condition.notify_all ();
+}
 catch (...)
 {
        store_current ();