+
+void
+Encoder::process_video (shared_ptr<Image> image, bool same, boost::shared_ptr<Subtitle> sub)
+{
+ DCPFrameRate dfr (_film->frames_per_second ());
+
+ if (dfr.skip && (_video_frames_in % 2)) {
+ ++_video_frames_in;
+ return;
+ }
+
+ boost::mutex::scoped_lock lock (_worker_mutex);
+
+ /* Wait until the queue has gone down a bit */
+ while (_encode_queue.size() >= _worker_threads.size() * 2 && !_terminate_encoder) {
+ TIMING ("decoder sleeps with queue of %1", _encode_queue.size());
+ _worker_condition.wait (lock);
+ TIMING ("decoder wakes with queue of %1", _encode_queue.size());
+ }
+
+ if (_terminate_encoder) {
+ return;
+ }
+
+ /* Only do the processing if we don't already have a file for this frame */
+ if (boost::filesystem::exists (_film->frame_out_path (_video_frames_out, false))) {
+ frame_skipped ();
+ return;
+ }
+
+ if (same && _have_a_real_frame) {
+ /* Use the last frame that we encoded. We do this by putting a null encoded
+ frame straight onto the writer's queue. It will know to duplicate the previous frame
+ in this case.
+ */
+ boost::mutex::scoped_lock lock2 (_writer_mutex);
+ _write_queue.push_back (make_pair (shared_ptr<EncodedData> (), _video_frames_out));
+ } else {
+ /* Queue this new frame for encoding */
+ pair<string, string> const s = Filter::ffmpeg_strings (_film->filters());
+ TIMING ("adding to queue of %1", _encode_queue.size ());
+ _encode_queue.push_back (boost::shared_ptr<DCPVideoFrame> (
+ new DCPVideoFrame (
+ image, sub, _film->format()->dcp_size(), _film->format()->dcp_padding (_film),
+ _film->subtitle_offset(), _film->subtitle_scale(),
+ _film->scaler(), _video_frames_out, _film->frames_per_second(), s.second,
+ _film->colour_lut(), _film->j2k_bandwidth(),
+ _film->log()
+ )
+ ));
+
+ _worker_condition.notify_all ();
+ _have_a_real_frame = true;
+ }
+
+ ++_video_frames_in;
+ ++_video_frames_out;
+
+ if (dfr.repeat) {
+ boost::mutex::scoped_lock lock2 (_writer_mutex);
+ _write_queue.push_back (make_pair (shared_ptr<EncodedData> (), _video_frames_out));
+ ++_video_frames_out;
+ }
+}
+
+void
+Encoder::process_audio (shared_ptr<AudioBuffers> data)
+{
+#if HAVE_SWRESAMPLE
+ /* Maybe sample-rate convert */
+ if (_swr_context) {
+
+ /* Compute the resampled frames count and add 32 for luck */
+ int const max_resampled_frames = ceil ((int64_t) data->frames() * _film->target_audio_sample_rate() / _film->audio_stream()->sample_rate()) + 32;
+
+ shared_ptr<AudioBuffers> resampled (new AudioBuffers (_film->audio_stream()->channels(), max_resampled_frames));
+
+ /* Resample audio */
+ int const resampled_frames = swr_convert (
+ _swr_context, (uint8_t **) resampled->data(), max_resampled_frames, (uint8_t const **) data->data(), data->frames()
+ );
+
+ if (resampled_frames < 0) {
+ throw EncodeError ("could not run sample-rate converter");
+ }
+
+ resampled->set_frames (resampled_frames);
+
+ /* And point our variables at the resampled audio */
+ data = resampled;
+ }
+#endif
+
+ if (_film->audio_channels() == 1) {
+ /* We need to switch things around so that the mono channel is on
+ the centre channel of a 5.1 set (with other channels silent).
+ */
+
+ shared_ptr<AudioBuffers> b (new AudioBuffers (6, data->frames ()));
+ b->make_silent (libdcp::LEFT);
+ b->make_silent (libdcp::RIGHT);
+ memcpy (b->data()[libdcp::CENTRE], data->data()[0], data->frames() * sizeof(float));
+ b->make_silent (libdcp::LFE);
+ b->make_silent (libdcp::LS);
+ b->make_silent (libdcp::RS);
+
+ data = b;
+ }
+
+ write_audio (data);
+
+ _audio_frames_in += data->frames ();
+}
+
+void
+Encoder::write_audio (shared_ptr<const AudioBuffers> audio)
+{
+ for (int i = 0; i < audio->channels(); ++i) {
+ sf_write_float (_sound_files[i], audio->data(i), audio->frames());
+ }
+
+ _audio_frames_out += audio->frames ();
+}
+
+void
+Encoder::close_sound_files ()
+{
+ for (vector<SNDFILE*>::iterator i = _sound_files.begin(); i != _sound_files.end(); ++i) {
+ sf_close (*i);
+ }
+
+ _sound_files.clear ();
+}
+
+void
+Encoder::terminate_worker_threads ()
+{
+ boost::mutex::scoped_lock lock (_worker_mutex);
+ _terminate_encoder = true;
+ _worker_condition.notify_all ();
+ lock.unlock ();
+
+ for (list<boost::thread *>::iterator i = _worker_threads.begin(); i != _worker_threads.end(); ++i) {
+ (*i)->join ();
+ delete *i;
+ }
+}
+
+void
+Encoder::finish_writer_thread ()
+{
+ if (!_writer_thread) {
+ return;
+ }
+
+ boost::mutex::scoped_lock lock (_writer_mutex);
+ _finish_writer = true;
+ _writer_condition.notify_all ();
+ lock.unlock ();
+
+ _writer_thread->join ();
+ delete _writer_thread;
+ _writer_thread = 0;
+}
+
+void
+Encoder::encoder_thread (ServerDescription* server)
+{
+ /* Number of seconds that we currently wait between attempts
+ to connect to the server; not relevant for localhost
+ encodings.
+ */
+ int remote_backoff = 0;
+
+ while (1) {
+
+ TIMING ("encoder thread %1 sleeps", boost::this_thread::get_id());
+ boost::mutex::scoped_lock lock (_worker_mutex);
+ while (_encode_queue.empty () && !_terminate_encoder) {
+ _worker_condition.wait (lock);
+ }
+
+ if (_terminate_encoder) {
+ return;
+ }
+
+ TIMING ("encoder thread %1 wakes with queue of %2", boost::this_thread::get_id(), _encode_queue.size());
+ boost::shared_ptr<DCPVideoFrame> vf = _encode_queue.front ();
+ _film->log()->log (String::compose ("Encoder thread %1 pops frame %2 from queue", boost::this_thread::get_id(), vf->frame()), Log::VERBOSE);
+ _encode_queue.pop_front ();
+
+ lock.unlock ();
+
+ shared_ptr<EncodedData> encoded;
+
+ if (server) {
+ try {
+ encoded = vf->encode_remotely (server);
+
+ if (remote_backoff > 0) {
+ _film->log()->log (String::compose ("%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;
+ }
+ _film->log()->log (
+ String::compose (
+ "Remote encode of %1 on %2 failed (%3); thread sleeping for %4s",
+ vf->frame(), server->host_name(), e.what(), remote_backoff)
+ );
+ }
+
+ } else {
+ try {
+ TIMING ("encoder thread %1 begins local encode of %2", boost::this_thread::get_id(), vf->frame());
+ encoded = vf->encode_locally ();
+ TIMING ("encoder thread %1 finishes local encode of %2", boost::this_thread::get_id(), vf->frame());
+ } catch (std::exception& e) {
+ _film->log()->log (String::compose ("Local encode failed (%1)", e.what ()));
+ }
+ }
+
+ if (encoded) {
+ boost::mutex::scoped_lock lock2 (_writer_mutex);
+ _write_queue.push_back (make_pair (encoded, vf->frame ()));
+ _writer_condition.notify_all ();
+ } else {
+ lock.lock ();
+ _film->log()->log (
+ String::compose ("Encoder thread %1 pushes frame %2 back onto queue after failure", boost::this_thread::get_id(), vf->frame())
+ );
+ _encode_queue.push_front (vf);
+ lock.unlock ();
+ }
+
+ if (remote_backoff > 0) {
+ dvdomatic_sleep (remote_backoff);
+ }
+
+ lock.lock ();
+ _worker_condition.notify_all ();
+ }
+}
+
+void
+Encoder::link (string a, string b) const
+{
+#ifdef DVDOMATIC_POSIX
+ int const r = symlink (a.c_str(), b.c_str());
+ if (r) {
+ throw EncodeError (String::compose ("could not create symlink from %1 to %2", a, b));
+ }
+#endif
+
+#ifdef DVDOMATIC_WINDOWS
+ boost::filesystem::copy_file (a, b);
+#endif
+}
+
+struct WriteQueueSorter
+{
+ bool operator() (pair<shared_ptr<EncodedData>, int> const & a, pair<shared_ptr<EncodedData>, int> const & b) {
+ return a.second < b.second;
+ }
+};
+
+void
+Encoder::writer_thread ()
+{
+ while (1)
+ {
+ boost::mutex::scoped_lock lock (_writer_mutex);
+
+ while (1) {
+ if (_finish_writer ||
+ _write_queue.size() > _maximum_frames_in_memory ||
+ (!_write_queue.empty() && _write_queue.front().second == (_last_written_frame + 1))) {
+
+ break;
+ }
+
+ TIMING ("writer sleeps with a queue of %1; %2 pending", _write_queue.size(), _pending.size());
+ _writer_condition.wait (lock);
+ TIMING ("writer wakes with a queue of %1", _write_queue.size());
+
+ _write_queue.sort (WriteQueueSorter ());
+ }
+
+ if (_finish_writer && _write_queue.empty() && _pending.empty()) {
+ return;
+ }
+
+ /* Write any frames that we can write; i.e. those that are in sequence */
+ while (!_write_queue.empty() && _write_queue.front().second == (_last_written_frame + 1)) {
+ pair<boost::shared_ptr<EncodedData>, int> encoded = _write_queue.front ();
+ _write_queue.pop_front ();
+
+ lock.unlock ();
+ /* XXX: write to mxf */
+ _film->log()->log (String::compose ("Writer writes %1 to MXF", encoded.second));
+ if (encoded.first) {
+ _picture_asset_writer->write (encoded.first->data(), encoded.first->size());
+ _last_written = encoded.first;
+ } else {
+ _picture_asset_writer->write (_last_written->data(), _last_written->size());
+ }
+ lock.lock ();
+
+ ++_last_written_frame;
+ }
+
+ while (_write_queue.size() > _maximum_frames_in_memory) {
+ /* Too many frames in memory which can't yet be written to the stream.
+ Put some to disk.
+ */
+
+ pair<boost::shared_ptr<EncodedData>, int> encoded = _write_queue.front ();
+ _write_queue.pop_back ();
+ if (!encoded.first) {
+ /* This is a `repeat-last' frame, so no need to write it to disk */
+ continue;
+ }
+
+ lock.unlock ();
+ _film->log()->log (String::compose ("Writer full; pushes %1 to disk", encoded.second));
+ encoded.first->write (_film, encoded.second);
+ lock.lock ();
+
+ _pending.push_back (encoded.second);
+ }
+
+ while (_write_queue.size() < _maximum_frames_in_memory && !_pending.empty()) {
+ /* We have some space in memory. Fetch some frames back off disk. */
+
+ _pending.sort ();
+ int const fetch = _pending.front ();
+
+ lock.unlock ();
+ _film->log()->log (String::compose ("Writer pulls %1 back from disk", fetch));
+ shared_ptr<EncodedData> encoded;
+ if (boost::filesystem::exists (_film->frame_out_path (fetch, false))) {
+ /* It's an actual frame (not a repeat-last); load it in */
+ encoded.reset (new EncodedData (_film->frame_out_path (fetch, false)));
+ }
+ lock.lock ();
+
+ _write_queue.push_back (make_pair (encoded, fetch));
+ _pending.remove (fetch);
+ }
+ }
+}