+ if (_playlist->length() == DCPTime()) {
+ /* Special case of an empty Film; just give one black frame */
+ emit_video (black_player_video_frame(EYES_BOTH), DCPTime());
+ return true;
+ }
+
+ /* Find the decoder or empty which is farthest behind where we are and make it emit some data */
+
+ shared_ptr<Piece> earliest_content;
+ optional<DCPTime> earliest_time;
+
+ BOOST_FOREACH (shared_ptr<Piece> i, _pieces) {
+ if (i->done) {
+ continue;
+ }
+
+ DCPTime const t = content_time_to_dcp (i, max(i->decoder->position(), i->content->trim_start()));
+ if (t > i->content->end()) {
+ i->done = true;
+ } else {
+
+ /* Given two choices at the same time, pick the one with texts so we see it before
+ the video.
+ */
+ if (!earliest_time || t < *earliest_time || (t == *earliest_time && !i->decoder->text.empty())) {
+ earliest_time = t;
+ earliest_content = i;
+ }
+ }
+ }
+
+ bool done = false;
+
+ enum {
+ NONE,
+ CONTENT,
+ BLACK,
+ SILENT
+ } which = NONE;
+
+ if (earliest_content) {
+ which = CONTENT;
+ }
+
+ if (!_black.done() && (!earliest_time || _black.position() < *earliest_time)) {
+ earliest_time = _black.position ();
+ which = BLACK;
+ }
+
+ if (!_silent.done() && (!earliest_time || _silent.position() < *earliest_time)) {
+ earliest_time = _silent.position ();
+ which = SILENT;
+ }
+
+ switch (which) {
+ case CONTENT:
+ earliest_content->done = earliest_content->decoder->pass ();
+ break;
+ case BLACK:
+ emit_video (black_player_video_frame(EYES_BOTH), _black.position());
+ _black.set_position (_black.position() + one_video_frame());
+ break;
+ case SILENT:
+ {
+ DCPTimePeriod period (_silent.period_at_position());
+ if (_last_audio_time) {
+ /* Sometimes the thing that happened last finishes fractionally before
+ this silence. Bodge the start time of the silence to fix it. I'm
+ not sure if this is the right solution --- maybe the last thing should
+ be padded `forward' rather than this thing padding `back'.
+ */
+ period.from = min(period.from, *_last_audio_time);
+ }
+ if (period.duration() > one_video_frame()) {
+ period.to = period.from + one_video_frame();
+ }
+ fill_audio (period);
+ _silent.set_position (period.to);
+ break;
+ }
+ case NONE:
+ done = true;
+ break;
+ }
+
+ /* Emit any audio that is ready */
+
+ /* Work out the time before which the audio is definitely all here. This is the earliest last_push_end of one
+ of our streams, or the position of the _silent.
+ */
+ DCPTime pull_to = _film->length ();
+ for (map<AudioStreamPtr, StreamState>::const_iterator i = _stream_states.begin(); i != _stream_states.end(); ++i) {
+ if (!i->second.piece->done && i->second.last_push_end < pull_to) {
+ pull_to = i->second.last_push_end;
+ }
+ }
+ if (!_silent.done() && _silent.position() < pull_to) {
+ pull_to = _silent.position();
+ }
+
+ list<pair<shared_ptr<AudioBuffers>, DCPTime> > audio = _audio_merger.pull (pull_to);
+ for (list<pair<shared_ptr<AudioBuffers>, DCPTime> >::iterator i = audio.begin(); i != audio.end(); ++i) {
+ if (_last_audio_time && i->second < *_last_audio_time) {
+ /* This new data comes before the last we emitted (or the last seek); discard it */
+ pair<shared_ptr<AudioBuffers>, DCPTime> cut = discard_audio (i->first, i->second, *_last_audio_time);
+ if (!cut.first) {
+ continue;
+ }
+ *i = cut;
+ } else if (_last_audio_time && i->second > *_last_audio_time) {
+ /* There's a gap between this data and the last we emitted; fill with silence */
+ fill_audio (DCPTimePeriod (*_last_audio_time, i->second));
+ }
+
+ emit_audio (i->first, i->second);
+ }
+
+ if (done) {
+ _shuffler->flush ();
+ for (list<pair<shared_ptr<PlayerVideo>, DCPTime> >::const_iterator i = _delay.begin(); i != _delay.end(); ++i) {
+ do_emit_video(i->first, i->second);
+ }
+ }
+
+ return done;
+}
+
+list<PlayerText>
+Player::closed_captions_for_frame (DCPTime time) const
+{
+ boost::mutex::scoped_lock _lm (_mutex);
+ return _active_texts[TEXT_CLOSED_CAPTION].get (
+ DCPTimePeriod(time, time + DCPTime::from_frames(1, _film->video_frame_rate()))
+ );
+}
+
+/** @return Open subtitles for the frame at the given time, converted to images */
+optional<PositionImage>
+Player::open_subtitles_for_frame (DCPTime time) const
+{
+ list<PositionImage> captions;
+ int const vfr = _film->video_frame_rate();
+
+ BOOST_FOREACH (
+ PlayerText j,
+ _active_texts[TEXT_OPEN_SUBTITLE].get_burnt(DCPTimePeriod(time, time + DCPTime::from_frames(1, vfr)), _always_burn_open_subtitles)
+ ) {
+
+ /* Image subtitles */
+ list<PositionImage> c = transform_bitmap_texts (j.image);
+ copy (c.begin(), c.end(), back_inserter (captions));
+
+ /* Text subtitles (rendered to an image) */
+ if (!j.text.empty ()) {
+ list<PositionImage> s = render_text (j.text, j.fonts, _video_container_size, time, vfr);
+ copy (s.begin(), s.end(), back_inserter (captions));
+ }
+ }
+
+ if (captions.empty ()) {
+ return optional<PositionImage> ();
+ }
+
+ return merge (captions);
+}
+
+void
+Player::video (weak_ptr<Piece> wp, ContentVideo video)
+{
+ shared_ptr<Piece> piece = wp.lock ();
+ if (!piece) {
+ return;
+ }
+
+ FrameRateChange frc(piece->content->active_video_frame_rate(), _film->video_frame_rate());
+ if (frc.skip && (video.frame % 2) == 1) {
+ return;
+ }
+
+ /* Time of the first frame we will emit */
+ DCPTime const time = content_video_to_dcp (piece, video.frame);
+
+ /* Discard if it's before the content's period or the last accurate seek. We can't discard
+ if it's after the content's period here as in that case we still need to fill any gap between
+ `now' and the end of the content's period.
+ */
+ if (time < piece->content->position() || (_last_video_time && time < *_last_video_time)) {
+ return;
+ }
+
+ /* Fill gaps that we discover now that we have some video which needs to be emitted.
+ This is where we need to fill to.
+ */
+ DCPTime fill_to = min (time, piece->content->end());
+
+ if (_last_video_time) {
+ DCPTime fill_from = max (*_last_video_time, piece->content->position());
+ LastVideoMap::const_iterator last = _last_video.find (wp);
+ if (_film->three_d()) {
+ DCPTime j = fill_from;
+ Eyes eyes = _last_video_eyes.get_value_or(EYES_LEFT);
+ if (eyes == EYES_BOTH) {
+ eyes = EYES_LEFT;
+ }
+ while (j < fill_to || eyes != video.eyes) {
+ if (last != _last_video.end()) {
+ shared_ptr<PlayerVideo> copy = last->second->shallow_copy();
+ copy->set_eyes (eyes);
+ emit_video (copy, j);
+ } else {
+ emit_video (black_player_video_frame(eyes), j);
+ }
+ if (eyes == EYES_RIGHT) {
+ j += one_video_frame();
+ }
+ eyes = increment_eyes (eyes);
+ }
+ } else {
+ for (DCPTime j = fill_from; j < fill_to; j += one_video_frame()) {
+ if (last != _last_video.end()) {
+ emit_video (last->second, j);
+ } else {
+ emit_video (black_player_video_frame(EYES_BOTH), j);
+ }
+ }
+ }
+ }
+
+ _last_video[wp].reset (
+ new PlayerVideo (
+ video.image,
+ piece->content->video->crop (),
+ piece->content->video->fade (video.frame),
+ piece->content->video->scale().size (
+ piece->content->video, _video_container_size, _film->frame_size ()
+ ),
+ _video_container_size,
+ video.eyes,
+ video.part,
+ piece->content->video->colour_conversion(),
+ piece->content,
+ video.frame
+ )
+ );
+
+ DCPTime t = time;
+ for (int i = 0; i < frc.repeat; ++i) {
+ if (t < piece->content->end()) {
+ emit_video (_last_video[wp], t);
+ }
+ t += one_video_frame ();
+ }
+}
+
+void
+Player::audio (weak_ptr<Piece> wp, AudioStreamPtr stream, ContentAudio content_audio)
+{
+ DCPOMATIC_ASSERT (content_audio.audio->frames() > 0);
+
+ shared_ptr<Piece> piece = wp.lock ();
+ if (!piece) {
+ return;
+ }
+
+ shared_ptr<AudioContent> content = piece->content->audio;
+ DCPOMATIC_ASSERT (content);
+
+ /* Compute time in the DCP */
+ DCPTime time = resampled_audio_to_dcp (piece, content_audio.frame);
+ /* And the end of this block in the DCP */
+ DCPTime end = time + DCPTime::from_frames(content_audio.audio->frames(), content->resampled_frame_rate());
+
+ /* Remove anything that comes before the start or after the end of the content */
+ if (time < piece->content->position()) {
+ pair<shared_ptr<AudioBuffers>, DCPTime> cut = discard_audio (content_audio.audio, time, piece->content->position());
+ if (!cut.first) {
+ /* This audio is entirely discarded */
+ return;
+ }
+ content_audio.audio = cut.first;
+ time = cut.second;
+ } else if (time > piece->content->end()) {
+ /* Discard it all */
+ return;
+ } else if (end > piece->content->end()) {
+ Frame const remaining_frames = DCPTime(piece->content->end() - time).frames_round(_film->audio_frame_rate());
+ if (remaining_frames == 0) {
+ return;
+ }
+ shared_ptr<AudioBuffers> cut (new AudioBuffers (content_audio.audio->channels(), remaining_frames));
+ cut->copy_from (content_audio.audio.get(), remaining_frames, 0, 0);
+ content_audio.audio = cut;
+ }
+
+ DCPOMATIC_ASSERT (content_audio.audio->frames() > 0);
+
+ /* Gain */
+
+ if (content->gain() != 0) {
+ shared_ptr<AudioBuffers> gain (new AudioBuffers (content_audio.audio));
+ gain->apply_gain (content->gain ());
+ content_audio.audio = gain;
+ }
+
+ /* Remap */
+
+ content_audio.audio = remap (content_audio.audio, _film->audio_channels(), stream->mapping());
+
+ /* Process */
+
+ if (_audio_processor) {
+ content_audio.audio = _audio_processor->run (content_audio.audio, _film->audio_channels ());
+ }
+
+ /* Push */
+
+ _audio_merger.push (content_audio.audio, time);
+ DCPOMATIC_ASSERT (_stream_states.find (stream) != _stream_states.end ());
+ _stream_states[stream].last_push_end = time + DCPTime::from_frames (content_audio.audio->frames(), _film->audio_frame_rate());
+}
+
+void
+Player::bitmap_text_start (weak_ptr<Piece> wp, weak_ptr<const TextContent> wc, ContentBitmapText subtitle)
+{
+ shared_ptr<Piece> piece = wp.lock ();
+ shared_ptr<const TextContent> text = wc.lock ();
+ if (!piece || !text) {
+ return;
+ }
+
+ /* Apply content's subtitle offsets */
+ subtitle.sub.rectangle.x += text->x_offset ();
+ subtitle.sub.rectangle.y += text->y_offset ();
+
+ /* Apply a corrective translation to keep the subtitle centred after the scale that is coming up */
+ subtitle.sub.rectangle.x -= subtitle.sub.rectangle.width * ((text->x_scale() - 1) / 2);
+ subtitle.sub.rectangle.y -= subtitle.sub.rectangle.height * ((text->y_scale() - 1) / 2);
+
+ /* Apply content's subtitle scale */
+ subtitle.sub.rectangle.width *= text->x_scale ();
+ subtitle.sub.rectangle.height *= text->y_scale ();
+
+ PlayerText ps;
+ ps.image.push_back (subtitle.sub);
+ DCPTime from (content_time_to_dcp (piece, subtitle.from()));
+
+ _active_texts[subtitle.type()].add_from (wc, ps, from);
+}
+
+void
+Player::plain_text_start (weak_ptr<Piece> wp, weak_ptr<const TextContent> wc, ContentStringText subtitle)
+{
+ shared_ptr<Piece> piece = wp.lock ();
+ shared_ptr<const TextContent> text = wc.lock ();
+ if (!piece || !text) {
+ return;
+ }
+
+ PlayerText ps;
+ DCPTime const from (content_time_to_dcp (piece, subtitle.from()));
+
+ if (from > piece->content->end()) {
+ return;
+ }
+
+ BOOST_FOREACH (dcp::SubtitleString s, subtitle.subs) {
+ s.set_h_position (s.h_position() + text->x_offset ());
+ s.set_v_position (s.v_position() + text->y_offset ());
+ float const xs = text->x_scale();
+ float const ys = text->y_scale();
+ float size = s.size();
+
+ /* Adjust size to express the common part of the scaling;
+ e.g. if xs = ys = 0.5 we scale size by 2.
+ */
+ if (xs > 1e-5 && ys > 1e-5) {
+ size *= 1 / min (1 / xs, 1 / ys);
+ }
+ s.set_size (size);
+
+ /* Then express aspect ratio changes */
+ if (fabs (1.0 - xs / ys) > dcp::ASPECT_ADJUST_EPSILON) {
+ s.set_aspect_adjust (xs / ys);
+ }
+
+ s.set_in (dcp::Time(from.seconds(), 1000));
+ ps.text.push_back (StringText (s, text->outline_width()));
+ ps.add_fonts (text->fonts ());
+ }
+
+ _active_texts[subtitle.type()].add_from (wc, ps, from);
+}
+
+void
+Player::subtitle_stop (weak_ptr<Piece> wp, weak_ptr<const TextContent> wc, ContentTime to, TextType type)
+{
+ if (!_active_texts[type].have (wc)) {
+ return;
+ }
+
+ shared_ptr<Piece> piece = wp.lock ();
+ shared_ptr<const TextContent> text = wc.lock ();
+ if (!piece || !text) {
+ return;
+ }
+
+ DCPTime const dcp_to = content_time_to_dcp (piece, to);
+
+ if (dcp_to > piece->content->end()) {
+ return;
+ }
+
+ pair<PlayerText, DCPTime> from = _active_texts[type].add_to (wc, dcp_to);
+
+ bool const always = (type == TEXT_OPEN_SUBTITLE && _always_burn_open_subtitles);
+ if (text->use() && !always && !text->burn()) {
+ Text (from.first, type, DCPTimePeriod (from.second, dcp_to));
+ }
+}
+
+void
+Player::seek (DCPTime time, bool accurate)
+{
+ boost::mutex::scoped_lock lm (_mutex);
+
+ if (!_have_valid_pieces) {
+ setup_pieces ();
+ }
+
+ if (_shuffler) {
+ _shuffler->clear ();
+ }
+
+ _delay.clear ();
+
+ if (_audio_processor) {
+ _audio_processor->flush ();
+ }
+
+ _audio_merger.clear ();
+ for (int i = 0; i < TEXT_COUNT; ++i) {
+ _active_texts[i].clear ();
+ }
+
+ BOOST_FOREACH (shared_ptr<Piece> i, _pieces) {
+ if (time < i->content->position()) {
+ /* Before; seek to the start of the content */
+ i->decoder->seek (dcp_to_content_time (i, i->content->position()), accurate);
+ i->done = false;
+ } else if (i->content->position() <= time && time < i->content->end()) {
+ /* During; seek to position */
+ i->decoder->seek (dcp_to_content_time (i, time), accurate);
+ i->done = false;
+ } else {
+ /* After; this piece is done */
+ i->done = true;
+ }
+ }
+
+ if (accurate) {
+ _last_video_time = time;
+ _last_video_eyes = EYES_LEFT;
+ _last_audio_time = time;
+ } else {
+ _last_video_time = optional<DCPTime>();
+ _last_video_eyes = optional<Eyes>();
+ _last_audio_time = optional<DCPTime>();
+ }
+
+ _black.set_position (time);
+ _silent.set_position (time);
+
+ _last_video.clear ();
+}
+
+void
+Player::emit_video (shared_ptr<PlayerVideo> pv, DCPTime time)
+{
+ /* We need a delay to give a little wiggle room to ensure that relevent subtitles arrive at the
+ player before the video that requires them.
+ */
+ _delay.push_back (make_pair (pv, time));
+
+ if (pv->eyes() == EYES_BOTH || pv->eyes() == EYES_RIGHT) {
+ _last_video_time = time + one_video_frame();
+ }
+ _last_video_eyes = increment_eyes (pv->eyes());
+
+ if (_delay.size() < 3) {
+ return;
+ }
+
+ pair<shared_ptr<PlayerVideo>, DCPTime> to_do = _delay.front();
+ _delay.pop_front();
+ do_emit_video (to_do.first, to_do.second);
+}
+
+void
+Player::do_emit_video (shared_ptr<PlayerVideo> pv, DCPTime time)
+{
+ if (pv->eyes() == EYES_BOTH || pv->eyes() == EYES_RIGHT) {
+ for (int i = 0; i < TEXT_COUNT; ++i) {
+ _active_texts[i].clear_before (time);
+ }
+ }
+
+ optional<PositionImage> subtitles = open_subtitles_for_frame (time);
+ if (subtitles) {
+ pv->set_text (subtitles.get ());
+ }
+
+ Video (pv, time);
+}
+
+void
+Player::emit_audio (shared_ptr<AudioBuffers> data, DCPTime time)
+{
+ /* Log if the assert below is about to fail */
+ if (_last_audio_time && time != *_last_audio_time) {
+ _film->log()->log(String::compose("Out-of-sequence emit %1 vs %2", to_string(time), to_string(*_last_audio_time)), LogEntry::TYPE_WARNING);
+ }
+
+ /* This audio must follow on from the previous */
+ DCPOMATIC_ASSERT (!_last_audio_time || time == *_last_audio_time);
+ Audio (data, time);
+ _last_audio_time = time + DCPTime::from_frames (data->frames(), _film->audio_frame_rate());
+}
+
+void
+Player::fill_audio (DCPTimePeriod period)
+{
+ if (period.from == period.to) {
+ return;
+ }
+
+ DCPOMATIC_ASSERT (period.from < period.to);
+
+ DCPTime t = period.from;
+ while (t < period.to) {
+ DCPTime block = min (DCPTime::from_seconds (0.5), period.to - t);
+ Frame const samples = block.frames_round(_film->audio_frame_rate());
+ if (samples) {
+ shared_ptr<AudioBuffers> silence (new AudioBuffers (_film->audio_channels(), samples));
+ silence->make_silent ();
+ emit_audio (silence, t);
+ }
+ t += block;
+ }
+}
+
+DCPTime
+Player::one_video_frame () const
+{
+ return DCPTime::from_frames (1, _film->video_frame_rate ());
+}
+
+pair<shared_ptr<AudioBuffers>, DCPTime>
+Player::discard_audio (shared_ptr<const AudioBuffers> audio, DCPTime time, DCPTime discard_to) const
+{
+ DCPTime const discard_time = discard_to - time;
+ Frame const discard_frames = discard_time.frames_round(_film->audio_frame_rate());
+ Frame remaining_frames = audio->frames() - discard_frames;
+ if (remaining_frames <= 0) {
+ return make_pair(shared_ptr<AudioBuffers>(), DCPTime());
+ }
+ shared_ptr<AudioBuffers> cut (new AudioBuffers (audio->channels(), remaining_frames));
+ cut->copy_from (audio.get(), remaining_frames, discard_frames, 0);
+ return make_pair(cut, time + discard_time);
+}
+
+void
+Player::set_dcp_decode_reduction (optional<int> reduction)
+{
+ {
+ boost::mutex::scoped_lock lm (_mutex);
+
+ if (reduction == _dcp_decode_reduction) {
+ return;
+ }
+
+ _dcp_decode_reduction = reduction;
+ _have_valid_pieces = false;
+ }
+
+ Changed (PlayerProperty::DCP_DECODE_REDUCTION, false);
+}
+
+DCPTime
+Player::content_time_to_dcp (shared_ptr<Content> content, ContentTime t)
+{
+ boost::mutex::scoped_lock lm (_mutex);
+
+ if (_have_valid_pieces) {
+ setup_pieces ();
+ }
+