X-Git-Url: https://git.carlh.net/gitweb/?a=blobdiff_plain;f=src%2Flib%2Fplayer.cc;h=cb6d519842c5c6cfce1ac92d5f1fe83f74a04e0c;hb=d8d7ddd4c39e3ea347afd1fccc037d8b0a31bc87;hp=310e91b6c1fd814b59a3acc0dcfc77cfa4c8d9e9;hpb=5d65df7ebdc96c658a6b7042e639cb395f91bfeb;p=dcpomatic.git

diff --git a/src/lib/player.cc b/src/lib/player.cc
index 310e91b6c..06f9e1365 100644
--- a/src/lib/player.cc
+++ b/src/lib/player.cc
@@ -1,5 +1,5 @@
 /*
-    Copyright (C) 2013 Carl Hetherington <cth@carlh.net>
+    Copyright (C) 2013-2014 Carl Hetherington <cth@carlh.net>
 
     This program is free software; you can redistribute it and/or modify
     it under the terms of the GNU General Public License as published by
@@ -18,625 +18,561 @@
 */
 
 #include <stdint.h>
+#include <algorithm>
 #include "player.h"
 #include "film.h"
 #include "ffmpeg_decoder.h"
+#include "audio_buffers.h"
 #include "ffmpeg_content.h"
-#include "still_image_decoder.h"
-#include "still_image_content.h"
-#include "moving_image_decoder.h"
-#include "moving_image_content.h"
+#include "image_decoder.h"
+#include "image_content.h"
 #include "sndfile_decoder.h"
 #include "sndfile_content.h"
 #include "subtitle_content.h"
+#include "subrip_decoder.h"
+#include "subrip_content.h"
+#include "dcp_content.h"
 #include "playlist.h"
 #include "job.h"
 #include "image.h"
+#include "raw_image_proxy.h"
 #include "ratio.h"
-#include "resampler.h"
 #include "log.h"
 #include "scaler.h"
+#include "render_subtitles.h"
+#include "config.h"
+#include "content_video.h"
+#include "player_video.h"
+#include "frame_rate_change.h"
+#include "dcp_content.h"
+#include "dcp_decoder.h"
+#include "dcp_subtitle_content.h"
+#include "dcp_subtitle_decoder.h"
+
+#define LOG_GENERAL(...) _film->log()->log (String::compose (__VA_ARGS__), Log::TYPE_GENERAL);
 
 using std::list;
 using std::cout;
 using std::min;
 using std::max;
+using std::min;
 using std::vector;
 using std::pair;
 using std::map;
+using std::make_pair;
 using boost::shared_ptr;
 using boost::weak_ptr;
 using boost::dynamic_pointer_cast;
-
-class Piece
-{
-public:
-	Piece (shared_ptr<Content> c)
-		: content (c)
-		, video_position (c->position ())
-		, audio_position (c->position ())
-	{}
-	
-	Piece (shared_ptr<Content> c, shared_ptr<Decoder> d)
-		: content (c)
-		, decoder (d)
-		, video_position (c->position ())
-		, audio_position (c->position ())
-	{}
-	
-	shared_ptr<Content> content;
-	shared_ptr<Decoder> decoder;
-	Time video_position;
-	Time audio_position;
-};
+using boost::optional;
 
 Player::Player (shared_ptr<const Film> f, shared_ptr<const Playlist> p)
 	: _film (f)
 	, _playlist (p)
-	, _video (true)
-	, _audio (true)
 	, _have_valid_pieces (false)
-	, _video_position (0)
-	, _audio_position (0)
-	, _audio_merger (f->audio_channels(), bind (&Film::time_to_audio_frames, f.get(), _1), bind (&Film::audio_frames_to_time, f.get(), _1))
-	, _last_emit_was_black (false)
+	, _approximate_size (false)
 {
 	_playlist_changed_connection = _playlist->Changed.connect (bind (&Player::playlist_changed, this));
 	_playlist_content_changed_connection = _playlist->ContentChanged.connect (bind (&Player::content_changed, this, _1, _2, _3));
 	_film_changed_connection = _film->Changed.connect (bind (&Player::film_changed, this, _1));
-	set_video_container_size (fit_ratio_within (_film->container()->ratio (), _film->full_frame ()));
-}
-
-void
-Player::disable_video ()
-{
-	_video = false;
+	set_video_container_size (_film->frame_size ());
 }
 
 void
-Player::disable_audio ()
+Player::setup_pieces ()
 {
-	_audio = false;
-}
+	list<shared_ptr<Piece> > old_pieces = _pieces;
+	_pieces.clear ();
 
-bool
-Player::pass ()
-{
-	if (!_have_valid_pieces) {
-		setup_pieces ();
-		_have_valid_pieces = true;
-	}
+	ContentList content = _playlist->content ();
 
-	Time earliest_t = TIME_MAX;
-	shared_ptr<Piece> earliest;
-	enum {
-		VIDEO,
-		AUDIO
-	} type = VIDEO;
+	for (ContentList::iterator i = content.begin(); i != content.end(); ++i) {
 
-	for (list<shared_ptr<Piece> >::iterator i = _pieces.begin(); i != _pieces.end(); ++i) {
-		if ((*i)->decoder->done ()) {
+		if (!(*i)->paths_valid ()) {
 			continue;
 		}
-
-		if (_video && dynamic_pointer_cast<VideoDecoder> ((*i)->decoder)) {
-			if ((*i)->video_position < earliest_t) {
-				earliest_t = (*i)->video_position;
-				earliest = *i;
-				type = VIDEO;
+		
+		shared_ptr<Decoder> decoder;
+		optional<FrameRateChange> frc;
+
+		/* Work out a FrameRateChange for the best overlap video for this content, in case we need it below */
+		DCPTime best_overlap_t;
+		shared_ptr<VideoContent> best_overlap;
+		for (ContentList::iterator j = content.begin(); j != content.end(); ++j) {
+			shared_ptr<VideoContent> vc = dynamic_pointer_cast<VideoContent> (*j);
+			if (!vc) {
+				continue;
+			}
+			
+			DCPTime const overlap = max (vc->position(), (*i)->position()) - min (vc->end(), (*i)->end());
+			if (overlap > best_overlap_t) {
+				best_overlap = vc;
+				best_overlap_t = overlap;
 			}
 		}
 
-		if (_audio && dynamic_pointer_cast<AudioDecoder> ((*i)->decoder)) {
-			if ((*i)->audio_position < earliest_t) {
-				earliest_t = (*i)->audio_position;
-				earliest = *i;
-				type = AUDIO;
-			}
+		optional<FrameRateChange> best_overlap_frc;
+		if (best_overlap) {
+			best_overlap_frc = FrameRateChange (best_overlap->video_frame_rate(), _film->video_frame_rate ());
+		} else {
+			/* No video overlap; e.g. if the DCP is just audio */
+			best_overlap_frc = FrameRateChange (_film->video_frame_rate(), _film->video_frame_rate ());
 		}
-	}
 
-	if (!earliest) {
-		flush ();
-		return true;
-	}
+		/* FFmpeg */
+		shared_ptr<const FFmpegContent> fc = dynamic_pointer_cast<const FFmpegContent> (*i);
+		if (fc) {
+			decoder.reset (new FFmpegDecoder (fc, _film->log()));
+			frc = FrameRateChange (fc->video_frame_rate(), _film->video_frame_rate());
+		}
 
-	switch (type) {
-	case VIDEO:
-		if (earliest_t > _video_position) {
-			emit_black ();
-		} else {
-			earliest->decoder->pass ();
+		shared_ptr<const DCPContent> dc = dynamic_pointer_cast<const DCPContent> (*i);
+		if (dc) {
+			decoder.reset (new DCPDecoder (dc, _film->log ()));
+			frc = FrameRateChange (dc->video_frame_rate(), _film->video_frame_rate());
 		}
-		break;
 
-	case AUDIO:
-		if (earliest_t > _audio_position) {
-			emit_silence (_film->time_to_audio_frames (earliest_t - _audio_position));
-		} else {
-			earliest->decoder->pass ();
-
-			if (earliest->decoder->done()) {
-				shared_ptr<AudioContent> ac = dynamic_pointer_cast<AudioContent> (earliest->content);
-				assert (ac);
-				shared_ptr<Resampler> re = resampler (ac, false);
-				if (re) {
-					shared_ptr<const AudioBuffers> b = re->flush ();
-					if (b->frames ()) {
-						process_audio (earliest, b, ac->audio_length ());
-					}
+		/* ImageContent */
+		shared_ptr<const ImageContent> ic = dynamic_pointer_cast<const ImageContent> (*i);
+		if (ic) {
+			/* See if we can re-use an old ImageDecoder */
+			for (list<shared_ptr<Piece> >::const_iterator j = old_pieces.begin(); j != old_pieces.end(); ++j) {
+				shared_ptr<ImageDecoder> imd = dynamic_pointer_cast<ImageDecoder> ((*j)->decoder);
+				if (imd && imd->content() == ic) {
+					decoder = imd;
 				}
 			}
-		}
-		break;
-	}
 
-	if (_audio) {
-		Time audio_done_up_to = TIME_MAX;
-		for (list<shared_ptr<Piece> >::iterator i = _pieces.begin(); i != _pieces.end(); ++i) {
-			if (dynamic_pointer_cast<AudioDecoder> ((*i)->decoder)) {
-				audio_done_up_to = min (audio_done_up_to, (*i)->audio_position);
+			if (!decoder) {
+				decoder.reset (new ImageDecoder (ic));
 			}
-		}
 
-		TimedAudioBuffers<Time> tb = _audio_merger.pull (audio_done_up_to);
-		Audio (tb.audio, tb.time);
-		_audio_position += _film->audio_frames_to_time (tb.audio->frames ());
-	}
-		
-	return false;
-}
+			frc = FrameRateChange (ic->video_frame_rate(), _film->video_frame_rate());
+		}
 
-void
-Player::process_video (weak_ptr<Piece> weak_piece, shared_ptr<const Image> image, Eyes eyes, bool same, VideoContent::Frame frame)
-{
-	/* Keep a note of what came in so that we can repeat it if required */
-	_last_process_video.weak_piece = weak_piece;
-	_last_process_video.image = image;
-	_last_process_video.eyes = eyes;
-	_last_process_video.same = same;
-	_last_process_video.frame = frame;
-	
-	shared_ptr<Piece> piece = weak_piece.lock ();
-	if (!piece) {
-		return;
-	}
+		/* SndfileContent */
+		shared_ptr<const SndfileContent> sc = dynamic_pointer_cast<const SndfileContent> (*i);
+		if (sc) {
+			decoder.reset (new SndfileDecoder (sc));
+			frc = best_overlap_frc;
+		}
 
-	shared_ptr<VideoContent> content = dynamic_pointer_cast<VideoContent> (piece->content);
-	assert (content);
+		/* SubRipContent */
+		shared_ptr<const SubRipContent> rc = dynamic_pointer_cast<const SubRipContent> (*i);
+		if (rc) {
+			decoder.reset (new SubRipDecoder (rc));
+			frc = best_overlap_frc;
+		}
 
-	FrameRateConversion frc (content->video_frame_rate(), _film->video_frame_rate());
-	if (frc.skip && (frame % 2) == 1) {
-		return;
-	}
+		/* DCPSubtitleContent */
+		shared_ptr<const DCPSubtitleContent> dsc = dynamic_pointer_cast<const DCPSubtitleContent> (*i);
+		if (dsc) {
+			decoder.reset (new DCPSubtitleDecoder (dsc));
+			frc = best_overlap_frc;
+		}
 
-	Time const relative_time = (frame * frc.factor() * TIME_HZ / _film->video_frame_rate());
-	if (content->trimmed (relative_time)) {
-		return;
+		_pieces.push_back (shared_ptr<Piece> (new Piece (*i, decoder, frc.get ())));
 	}
 
-	/* Convert to RGB first, as FFmpeg doesn't seem to like handling YUV images with odd widths */
-	shared_ptr<Image> work_image = image->scale (image->size (), _film->scaler(), PIX_FMT_RGB24, true);
-
-	work_image = work_image->crop (content->crop(), true);
-
-	float const ratio = content->ratio() ? content->ratio()->ratio() : content->video_size_after_crop().ratio();
-	libdcp::Size image_size = fit_ratio_within (ratio, _video_container_size);
-	
-	work_image = work_image->scale (image_size, _film->scaler(), PIX_FMT_RGB24, true);
-
-	Time time = content->position() + relative_time - content->trim_start ();
-	    
-	if (_film->with_subtitles () && _out_subtitle.image && time >= _out_subtitle.from && time <= _out_subtitle.to) {
-		work_image->alpha_blend (_out_subtitle.image, _out_subtitle.position);
-	}
+	_have_valid_pieces = true;
+}
 
-	if (image_size != _video_container_size) {
-		assert (image_size.width <= _video_container_size.width);
-		assert (image_size.height <= _video_container_size.height);
-		shared_ptr<Image> im (new Image (PIX_FMT_RGB24, _video_container_size, true));
-		im->make_black ();
-		im->copy (work_image, Position<int> ((_video_container_size.width - image_size.width) / 2, (_video_container_size.height - image_size.height) / 2));
-		work_image = im;
+void
+Player::content_changed (weak_ptr<Content> w, int property, bool frequent)
+{
+	shared_ptr<Content> c = w.lock ();
+	if (!c) {
+		return;
 	}
 
-#ifdef DCPOMATIC_DEBUG
-	_last_video = piece->content;
-#endif
-
-	Video (work_image, eyes, content->colour_conversion(), same, time);
-	time += TIME_HZ / _film->video_frame_rate();
+	if (
+		property == ContentProperty::POSITION ||
+		property == ContentProperty::LENGTH ||
+		property == ContentProperty::TRIM_START ||
+		property == ContentProperty::TRIM_END ||
+		property == ContentProperty::PATH ||
+		property == VideoContentProperty::VIDEO_FRAME_TYPE ||
+		property == DCPContentProperty::CAN_BE_PLAYED
+		) {
+		
+		_have_valid_pieces = false;
+		Changed (frequent);
 
-	if (frc.repeat) {
-		Video (work_image, eyes, content->colour_conversion(), true, time);
-		time += TIME_HZ / _film->video_frame_rate();
+	} else if (
+		property == SubtitleContentProperty::USE_SUBTITLES ||
+		property == SubtitleContentProperty::SUBTITLE_X_OFFSET ||
+		property == SubtitleContentProperty::SUBTITLE_Y_OFFSET ||
+		property == SubtitleContentProperty::SUBTITLE_SCALE ||
+		property == VideoContentProperty::VIDEO_CROP ||
+		property == VideoContentProperty::VIDEO_SCALE ||
+		property == VideoContentProperty::VIDEO_FRAME_RATE
+		) {
+		
+		Changed (frequent);
 	}
-
-	_last_emit_was_black = false;
-
-	_video_position = piece->video_position = time;
 }
 
+/** @param already_resampled true if this data has already been through the chain up to the resampler */
 void
-Player::process_audio (weak_ptr<Piece> weak_piece, shared_ptr<const AudioBuffers> audio, AudioContent::Frame frame)
+Player::playlist_changed ()
 {
-	shared_ptr<Piece> piece = weak_piece.lock ();
-	if (!piece) {
-		return;
-	}
+	_have_valid_pieces = false;
+	Changed (false);
+}
 
-	shared_ptr<AudioContent> content = dynamic_pointer_cast<AudioContent> (piece->content);
-	assert (content);
+void
+Player::set_video_container_size (dcp::Size s)
+{
+	_video_container_size = s;
 
-	/* Gain */
-	if (content->audio_gain() != 0) {
-		shared_ptr<AudioBuffers> gain (new AudioBuffers (audio));
-		gain->apply_gain (content->audio_gain ());
-		audio = gain;
-	}
+	_black_image.reset (new Image (PIX_FMT_RGB24, _video_container_size, true));
+	_black_image->make_black ();
+}
 
-	/* Resample */
-	if (content->content_audio_frame_rate() != content->output_audio_frame_rate()) {
-		shared_ptr<Resampler> r = resampler (content, true);
-		pair<shared_ptr<const AudioBuffers>, AudioContent::Frame> ro = r->run (audio, frame);
-		audio = ro.first;
-		frame = ro.second;
-	}
-	
-	Time const relative_time = _film->audio_frames_to_time (frame);
+void
+Player::film_changed (Film::Property p)
+{
+	/* Here we should notice Film properties that affect our output, and
+	   alert listeners that our output now would be different to how it was
+	   last time we were run.
+	*/
 
-	if (content->trimmed (relative_time)) {
-		return;
+	if (p == Film::SCALER || p == Film::CONTAINER || p == Film::VIDEO_FRAME_RATE) {
+		Changed (false);
 	}
+}
 
-	Time time = content->position() + (content->audio_delay() * TIME_HZ / 1000) + relative_time;
+list<PositionImage>
+Player::transform_image_subtitles (list<ImageSubtitle> subs) const
+{
+	list<PositionImage> all;
 	
-	/* Remap channels */
-	shared_ptr<AudioBuffers> dcp_mapped (new AudioBuffers (_film->audio_channels(), audio->frames()));
-	dcp_mapped->make_silent ();
-	list<pair<int, libdcp::Channel> > map = content->audio_mapping().content_to_dcp ();
-	for (list<pair<int, libdcp::Channel> >::iterator i = map.begin(); i != map.end(); ++i) {
-		if (i->first < audio->channels() && i->second < dcp_mapped->channels()) {
-			dcp_mapped->accumulate_channel (audio.get(), i->first, i->second);
-		}
-	}
-
-	audio = dcp_mapped;
-
-	/* We must cut off anything that comes before the start of all time */
-	if (time < 0) {
-		int const frames = - time * _film->audio_frame_rate() / TIME_HZ;
-		if (frames >= audio->frames ()) {
-			return;
+	for (list<ImageSubtitle>::const_iterator i = subs.begin(); i != subs.end(); ++i) {
+		if (!i->image) {
+			continue;
 		}
 
-		shared_ptr<AudioBuffers> trimmed (new AudioBuffers (audio->channels(), audio->frames() - frames));
-		trimmed->copy_from (audio.get(), audio->frames() - frames, frames, 0);
-
-		audio = trimmed;
-		time = 0;
-	}
-
-	_audio_merger.push (audio, time);
-	piece->audio_position += _film->audio_frames_to_time (audio->frames ());
+		/* We will scale the subtitle up to fit _video_container_size */
+		dcp::Size scaled_size (i->rectangle.width * _video_container_size.width, i->rectangle.height * _video_container_size.height);
+		
+		/* Then we need a corrective translation, consisting of two parts:
+		 *
+		 * 1.  that which is the result of the scaling of the subtitle by _video_container_size; this will be
+		 *     rect.x * _video_container_size.width and rect.y * _video_container_size.height.
+		 *
+		 * 2.  that to shift the origin of the scale by subtitle_scale to the centre of the subtitle; this will be
+		 *     (width_before_subtitle_scale * (1 - subtitle_scale) / 2) and
+		 *     (height_before_subtitle_scale * (1 - subtitle_scale) / 2).
+		 *
+		 * Combining these two translations gives these expressions.
+		 */
+
+		all.push_back (
+			PositionImage (
+				i->image->scale (
+					scaled_size,
+					Scaler::from_id ("bicubic"),
+					i->image->pixel_format (),
+					true
+					),
+				Position<int> (
+					rint (_video_container_size.width * i->rectangle.x),
+					rint (_video_container_size.height * i->rectangle.y)
+					)
+				)
+			);
+	}
+
+	return all;
 }
 
 void
-Player::flush ()
+Player::set_approximate_size ()
 {
-	TimedAudioBuffers<Time> tb = _audio_merger.flush ();
-	if (tb.audio) {
-		Audio (tb.audio, tb.time);
-		_audio_position += _film->audio_frames_to_time (tb.audio->frames ());
-	}
-
-	while (_video_position < _audio_position) {
-		emit_black ();
-	}
+	_approximate_size = true;
+}
 
-	while (_audio_position < _video_position) {
-		emit_silence (_film->time_to_audio_frames (_video_position - _audio_position));
-	}
-	
+shared_ptr<PlayerVideo>
+Player::black_player_video_frame (DCPTime time) const
+{
+	return shared_ptr<PlayerVideo> (
+		new PlayerVideo (
+			shared_ptr<const ImageProxy> (new RawImageProxy (_black_image, _film->log ())),
+			time,
+			Crop (),
+			_video_container_size,
+			_video_container_size,
+			Scaler::from_id ("bicubic"),
+			EYES_BOTH,
+			PART_WHOLE,
+			Config::instance()->colour_conversions().front().conversion
+		)
+	);
 }
 
-/** Seek so that the next pass() will yield (approximately) the requested frame.
- *  Pass accurate = true to try harder to get close to the request.
- *  @return true on error
- */
-void
-Player::seek (Time t, bool accurate)
+/** @return All PlayerVideos at the given time (there may be two frames for 3D) */
+list<shared_ptr<PlayerVideo> >
+Player::get_video (DCPTime time, bool accurate)
 {
 	if (!_have_valid_pieces) {
 		setup_pieces ();
-		_have_valid_pieces = true;
 	}
+	
+	list<shared_ptr<Piece> > ov = overlaps<VideoContent> (
+		time,
+		time + DCPTime::from_frames (1, _film->video_frame_rate ())
+		);
 
-	if (_pieces.empty ()) {
-		return;
-	}
+	list<shared_ptr<PlayerVideo> > pvf;
 
-	for (list<shared_ptr<Piece> >::iterator i = _pieces.begin(); i != _pieces.end(); ++i) {
-		shared_ptr<VideoContent> vc = dynamic_pointer_cast<VideoContent> ((*i)->content);
-		if (!vc) {
-			continue;
+	if (ov.empty ()) {
+		/* No video content at this time */
+		pvf.push_back (black_player_video_frame (time));
+	} else {
+		/* Create a PlayerVideo from the content's video at this time */
+
+		shared_ptr<Piece> piece = ov.back ();
+		shared_ptr<VideoDecoder> decoder = dynamic_pointer_cast<VideoDecoder> (piece->decoder);
+		assert (decoder);
+		shared_ptr<VideoContent> content = dynamic_pointer_cast<VideoContent> (piece->content);
+		assert (content);
+
+		list<ContentVideo> content_video = decoder->get_video (dcp_to_content_video (piece, time), accurate);
+		if (content_video.empty ()) {
+			pvf.push_back (black_player_video_frame (time));
+			return pvf;
+		}
+		
+		dcp::Size image_size = content->scale().size (content, _video_container_size, _film->frame_size ());
+		if (_approximate_size) {
+			image_size.width &= ~3;
+			image_size.height &= ~3;
 		}
 		
-		Time s = t - vc->position ();
-		s = max (static_cast<Time> (0), s);
-		s = min (vc->length_after_trim(), s);
-
-		(*i)->video_position = (*i)->audio_position = vc->position() + s;
-
-		FrameRateConversion frc (vc->video_frame_rate(), _film->video_frame_rate());
-		/* Here we are converting from time (in the DCP) to a frame number in the content.
-		   Hence we need to use the DCP's frame rate and the double/skip correction, not
-		   the source's rate.
-		*/
-		VideoContent::Frame f = (s + vc->trim_start ()) * _film->video_frame_rate() / (frc.factor() * TIME_HZ);
-		dynamic_pointer_cast<VideoDecoder>((*i)->decoder)->seek (f, accurate);
+		for (list<ContentVideo>::const_iterator i = content_video.begin(); i != content_video.end(); ++i) {
+			pvf.push_back (
+				shared_ptr<PlayerVideo> (
+					new PlayerVideo (
+						i->image,
+						content_video_to_dcp (piece, i->frame),
+						content->crop (),
+						image_size,
+						_video_container_size,
+						_film->scaler(),
+						i->eyes,
+						i->part,
+						content->colour_conversion ()
+						)
+					)
+				);
+		}
 	}
 
-	_video_position = _audio_position = t;
+	/* Add subtitles (for possible burn-in) to whatever PlayerVideos we got */
+
+	PlayerSubtitles ps = get_subtitles (time, DCPTime::from_frames (1, _film->video_frame_rate ()), false);
+
+	list<PositionImage> sub_images;
+
+	/* Image subtitles */
+	list<PositionImage> c = transform_image_subtitles (ps.image);
+	copy (c.begin(), c.end(), back_inserter (sub_images));
+
+	/* Text subtitles (rendered to images) */
+	sub_images.push_back (render_subtitles (ps.text, _video_container_size));
 	
-	/* XXX: don't seek audio because we don't need to... */
+	if (!sub_images.empty ()) {
+		for (list<shared_ptr<PlayerVideo> >::const_iterator i = pvf.begin(); i != pvf.end(); ++i) {
+			(*i)->set_subtitle (merge (sub_images));
+		}
+	}	
+		
+	return pvf;
 }
 
-void
-Player::setup_pieces ()
+shared_ptr<AudioBuffers>
+Player::get_audio (DCPTime time, DCPTime length, bool accurate)
 {
-	list<shared_ptr<Piece> > old_pieces = _pieces;
-
-	_pieces.clear ();
-
-	ContentList content = _playlist->content ();
-	sort (content.begin(), content.end(), ContentSorter ());
+	if (!_have_valid_pieces) {
+		setup_pieces ();
+	}
 
-	for (ContentList::iterator i = content.begin(); i != content.end(); ++i) {
+	AudioFrame const length_frames = length.frames (_film->audio_frame_rate ());
 
-		shared_ptr<Piece> piece (new Piece (*i));
+	shared_ptr<AudioBuffers> audio (new AudioBuffers (_film->audio_channels(), length_frames));
+	audio->make_silent ();
+	
+	list<shared_ptr<Piece> > ov = overlaps<AudioContent> (time, time + length);
+	if (ov.empty ()) {
+		return audio;
+	}
 
-		/* XXX: into content? */
+	for (list<shared_ptr<Piece> >::iterator i = ov.begin(); i != ov.end(); ++i) {
 
-		shared_ptr<const FFmpegContent> fc = dynamic_pointer_cast<const FFmpegContent> (*i);
-		if (fc) {
-			shared_ptr<FFmpegDecoder> fd (new FFmpegDecoder (_film, fc, _video, _audio));
-			
-			fd->Video.connect (bind (&Player::process_video, this, piece, _1, _2, _3, _4));
-			fd->Audio.connect (bind (&Player::process_audio, this, piece, _1, _2));
-			fd->Subtitle.connect (bind (&Player::process_subtitle, this, piece, _1, _2, _3, _4));
+		shared_ptr<AudioContent> content = dynamic_pointer_cast<AudioContent> ((*i)->content);
+		assert (content);
+		shared_ptr<AudioDecoder> decoder = dynamic_pointer_cast<AudioDecoder> ((*i)->decoder);
+		assert (decoder);
 
-			piece->decoder = fd;
+		if (content->audio_frame_rate() == 0) {
+			/* This AudioContent has no audio (e.g. if it is an FFmpegContent with no
+			 * audio stream).
+			 */
+			continue;
 		}
-		
-		shared_ptr<const StillImageContent> ic = dynamic_pointer_cast<const StillImageContent> (*i);
-		if (ic) {
-			shared_ptr<StillImageDecoder> id;
-			
-			/* See if we can re-use an old StillImageDecoder */
-			for (list<shared_ptr<Piece> >::const_iterator j = old_pieces.begin(); j != old_pieces.end(); ++j) {
-				shared_ptr<StillImageDecoder> imd = dynamic_pointer_cast<StillImageDecoder> ((*j)->decoder);
-				if (imd && imd->content() == ic) {
-					id = imd;
-				}
-			}
-
-			if (!id) {
-				id.reset (new StillImageDecoder (_film, ic));
-				id->Video.connect (bind (&Player::process_video, this, piece, _1, _2, _3, _4));
-			}
 
-			piece->decoder = id;
+		/* The time that we should request from the content */
+		DCPTime request = time - DCPTime::from_seconds (content->audio_delay() / 1000.0);
+		DCPTime offset;
+		if (request < DCPTime ()) {
+			/* We went off the start of the content, so we will need to offset
+			   the stuff we get back.
+			*/
+			offset = -request;
+			request = DCPTime ();
 		}
 
-		shared_ptr<const MovingImageContent> mc = dynamic_pointer_cast<const MovingImageContent> (*i);
-		if (mc) {
-			shared_ptr<MovingImageDecoder> md;
+		AudioFrame const content_frame = dcp_to_content_audio (*i, request);
 
-			if (!md) {
-				md.reset (new MovingImageDecoder (_film, mc));
-				md->Video.connect (bind (&Player::process_video, this, piece, _1, _2, _3, _4));
-			}
+		/* Audio from this piece's decoder (which might be more or less than what we asked for) */
+		shared_ptr<ContentAudio> all = decoder->get_audio (content_frame, length_frames, accurate);
 
-			piece->decoder = md;
+		/* Gain */
+		if (content->audio_gain() != 0) {
+			shared_ptr<AudioBuffers> gain (new AudioBuffers (all->audio));
+			gain->apply_gain (content->audio_gain ());
+			all->audio = gain;
 		}
 
-		shared_ptr<const SndfileContent> sc = dynamic_pointer_cast<const SndfileContent> (*i);
-		if (sc) {
-			shared_ptr<AudioDecoder> sd (new SndfileDecoder (_film, sc));
-			sd->Audio.connect (bind (&Player::process_audio, this, piece, _1, _2));
-
-			piece->decoder = sd;
+		/* Remap channels */
+		shared_ptr<AudioBuffers> dcp_mapped (new AudioBuffers (_film->audio_channels(), all->audio->frames()));
+		dcp_mapped->make_silent ();
+		AudioMapping map = content->audio_mapping ();
+		for (int i = 0; i < map.content_channels(); ++i) {
+			for (int j = 0; j < _film->audio_channels(); ++j) {
+				if (map.get (i, static_cast<dcp::Channel> (j)) > 0) {
+					dcp_mapped->accumulate_channel (
+						all->audio.get(),
+						i,
+						j,
+						map.get (i, static_cast<dcp::Channel> (j))
+						);
+				}
+			}
 		}
+		
+		all->audio = dcp_mapped;
 
-		_pieces.push_back (piece);
+		audio->accumulate_frames (
+			all->audio.get(),
+			content_frame - all->frame,
+			offset.frames (_film->audio_frame_rate()),
+			min (AudioFrame (all->audio->frames()), length_frames) - offset.frames (_film->audio_frame_rate ())
+			);
 	}
+
+	return audio;
 }
 
-void
-Player::content_changed (weak_ptr<Content> w, int property, bool frequent)
+VideoFrame
+Player::dcp_to_content_video (shared_ptr<const Piece> piece, DCPTime t) const
 {
-	shared_ptr<Content> c = w.lock ();
-	if (!c) {
-		return;
-	}
-
-	if (
-		property == ContentProperty::POSITION || property == ContentProperty::LENGTH ||
-		property == ContentProperty::TRIM_START || property == ContentProperty::TRIM_END
-		) {
-		
-		_have_valid_pieces = false;
-		Changed (frequent);
-
-	} else if (property == SubtitleContentProperty::SUBTITLE_OFFSET || property == SubtitleContentProperty::SUBTITLE_SCALE) {
-
-		update_subtitle ();
-		Changed (frequent);
+	/* s is the offset of t from the start position of this content */
+	DCPTime s = t - piece->content->position ();
+	s = DCPTime (max (DCPTime::Type (0), s.get ()));
+	s = DCPTime (min (piece->content->length_after_trim().get(), s.get()));
 
-	} else if (
-		property == VideoContentProperty::VIDEO_FRAME_TYPE || property == VideoContentProperty::VIDEO_CROP ||
-		property == VideoContentProperty::VIDEO_RATIO
-		) {
-		
-		Changed (frequent);
-
-	} else if (property == ContentProperty::PATH) {
-
-		Changed (frequent);
-	}
+	/* Convert this to the content frame */
+	return DCPTime (s + piece->content->trim_start()).frames (_film->video_frame_rate()) * piece->frc.factor ();
 }
 
-void
-Player::playlist_changed ()
+DCPTime
+Player::content_video_to_dcp (shared_ptr<const Piece> piece, VideoFrame f) const
 {
-	_have_valid_pieces = false;
-	Changed (false);
+	DCPTime t = DCPTime::from_frames (f / piece->frc.factor (), _film->video_frame_rate()) - piece->content->trim_start () + piece->content->position ();
+	if (t < DCPTime ()) {
+		t = DCPTime ();
+	}
+
+	return t;
 }
 
-void
-Player::set_video_container_size (libdcp::Size s)
+AudioFrame
+Player::dcp_to_content_audio (shared_ptr<const Piece> piece, DCPTime t) const
 {
-	_video_container_size = s;
-	_black_frame.reset (new Image (PIX_FMT_RGB24, _video_container_size, true));
-	_black_frame->make_black ();
+	/* s is the offset of t from the start position of this content */
+	DCPTime s = t - piece->content->position ();
+	s = DCPTime (max (DCPTime::Type (0), s.get ()));
+	s = DCPTime (min (piece->content->length_after_trim().get(), s.get()));
+
+	/* Convert this to the content frame */
+	return DCPTime (s + piece->content->trim_start()).frames (_film->audio_frame_rate());
 }
 
-shared_ptr<Resampler>
-Player::resampler (shared_ptr<AudioContent> c, bool create)
+ContentTime
+Player::dcp_to_content_subtitle (shared_ptr<const Piece> piece, DCPTime t) const
 {
-	map<shared_ptr<AudioContent>, shared_ptr<Resampler> >::iterator i = _resamplers.find (c);
-	if (i != _resamplers.end ()) {
-		return i->second;
-	}
+	/* s is the offset of t from the start position of this content */
+	DCPTime s = t - piece->content->position ();
+	s = DCPTime (max (DCPTime::Type (0), s.get ()));
+	s = DCPTime (min (piece->content->length_after_trim().get(), s.get()));
 
-	if (!create) {
-		return shared_ptr<Resampler> ();
-	}
-	
-	shared_ptr<Resampler> r (new Resampler (c->content_audio_frame_rate(), c->output_audio_frame_rate(), c->audio_channels()));
-	_resamplers[c] = r;
-	return r;
+	return ContentTime (s + piece->content->trim_start(), piece->frc);
 }
 
 void
-Player::emit_black ()
+PlayerStatistics::dump (shared_ptr<Log> log) const
 {
-#ifdef DCPOMATIC_DEBUG
-	_last_video.reset ();
-#endif
-	
-	Video (_black_frame, EYES_BOTH, ColourConversion(), _last_emit_was_black, _video_position);
-	_video_position += _film->video_frames_to_time (1);
-	_last_emit_was_black = true;
+	log->log (String::compose ("Video: %1 good %2 skipped %3 black %4 repeat", video.good, video.skip, video.black, video.repeat), Log::TYPE_GENERAL);
+	log->log (String::compose ("Audio: %1 good %2 skipped %3 silence", audio.good, audio.skip, audio.silence.seconds()), Log::TYPE_GENERAL);
 }
 
-void
-Player::emit_silence (OutputAudioFrame most)
+PlayerStatistics const &
+Player::statistics () const
 {
-	if (most == 0) {
-		return;
-	}
-	
-	OutputAudioFrame N = min (most, _film->audio_frame_rate() / 2);
-	shared_ptr<AudioBuffers> silence (new AudioBuffers (_film->audio_channels(), N));
-	silence->make_silent ();
-	Audio (silence, _audio_position);
-	_audio_position += _film->audio_frames_to_time (N);
+	return _statistics;
 }
 
-void
-Player::film_changed (Film::Property p)
+PlayerSubtitles
+Player::get_subtitles (DCPTime time, DCPTime length, bool starting)
 {
-	/* Here we should notice Film properties that affect our output, and
-	   alert listeners that our output now would be different to how it was
-	   last time we were run.
-	*/
+	list<shared_ptr<Piece> > subs = overlaps<SubtitleContent> (time, time + length);
 
-	if (p == Film::SCALER || p == Film::WITH_SUBTITLES || p == Film::CONTAINER) {
-		Changed (false);
-	}
-}
+	PlayerSubtitles ps (time, length);
 
-void
-Player::process_subtitle (weak_ptr<Piece> weak_piece, shared_ptr<Image> image, dcpomatic::Rect<double> rect, Time from, Time to)
-{
-	_in_subtitle.piece = weak_piece;
-	_in_subtitle.image = image;
-	_in_subtitle.rect = rect;
-	_in_subtitle.from = from;
-	_in_subtitle.to = to;
+	for (list<shared_ptr<Piece> >::const_iterator j = subs.begin(); j != subs.end(); ++j) {
+		shared_ptr<SubtitleContent> subtitle_content = dynamic_pointer_cast<SubtitleContent> ((*j)->content);
+		if (!subtitle_content->use_subtitles ()) {
+			continue;
+		}
 
-	update_subtitle ();
-}
+		shared_ptr<SubtitleDecoder> subtitle_decoder = dynamic_pointer_cast<SubtitleDecoder> ((*j)->decoder);
+		ContentTime const from = dcp_to_content_subtitle (*j, time);
+		/* XXX: this video_frame_rate() should be the rate that the subtitle content has been prepared for */
+		ContentTime const to = from + ContentTime::from_frames (1, _film->video_frame_rate ());
 
-void
-Player::update_subtitle ()
-{
-	shared_ptr<Piece> piece = _in_subtitle.piece.lock ();
-	if (!piece) {
-		return;
-	}
+		list<ContentImageSubtitle> image = subtitle_decoder->get_image_subtitles (ContentTimePeriod (from, to), starting);
+		for (list<ContentImageSubtitle>::iterator i = image.begin(); i != image.end(); ++i) {
+			
+			/* Apply content's subtitle offsets */
+			i->sub.rectangle.x += subtitle_content->subtitle_x_offset ();
+			i->sub.rectangle.y += subtitle_content->subtitle_y_offset ();
 
-	if (!_in_subtitle.image) {
-		_out_subtitle.image.reset ();
-		return;
-	}
+			/* Apply content's subtitle scale */
+			i->sub.rectangle.width *= subtitle_content->subtitle_scale ();
+			i->sub.rectangle.height *= subtitle_content->subtitle_scale ();
 
-	shared_ptr<SubtitleContent> sc = dynamic_pointer_cast<SubtitleContent> (piece->content);
-	assert (sc);
-
-	dcpomatic::Rect<double> in_rect = _in_subtitle.rect;
-	libdcp::Size scaled_size;
-
-	in_rect.y += sc->subtitle_offset ();
-
-	/* We will scale the subtitle up to fit _video_container_size, and also by the additional subtitle_scale */
-	scaled_size.width = in_rect.width * _video_container_size.width * sc->subtitle_scale ();
-	scaled_size.height = in_rect.height * _video_container_size.height * sc->subtitle_scale ();
-
-	/* Then we need a corrective translation, consisting of two parts:
-	 *
-	 * 1.  that which is the result of the scaling of the subtitle by _video_container_size; this will be
-	 *     rect.x * _video_container_size.width and rect.y * _video_container_size.height.
-	 *
-	 * 2.  that to shift the origin of the scale by subtitle_scale to the centre of the subtitle; this will be
-	 *     (width_before_subtitle_scale * (1 - subtitle_scale) / 2) and
-	 *     (height_before_subtitle_scale * (1 - subtitle_scale) / 2).
-	 *
-	 * Combining these two translations gives these expressions.
-	 */
-	
-	_out_subtitle.position.x = rint (_video_container_size.width * (in_rect.x + (in_rect.width * (1 - sc->subtitle_scale ()) / 2)));
-	_out_subtitle.position.y = rint (_video_container_size.height * (in_rect.y + (in_rect.height * (1 - sc->subtitle_scale ()) / 2)));
-	
-	_out_subtitle.image = _in_subtitle.image->scale (
-		scaled_size,
-		Scaler::from_id ("bicubic"),
-		_in_subtitle.image->pixel_format (),
-		true
-		);
-	_out_subtitle.from = _in_subtitle.from + piece->content->position ();
-	_out_subtitle.to = _in_subtitle.to + piece->content->position ();
-}
+			/* Apply a corrective translation to keep the subtitle centred after that scale */
+			i->sub.rectangle.x -= i->sub.rectangle.width * (subtitle_content->subtitle_scale() - 1);
+			i->sub.rectangle.y -= i->sub.rectangle.height * (subtitle_content->subtitle_scale() - 1);
+			
+			ps.image.push_back (i->sub);
+		}
 
-/** Re-emit the last frame that was emitted, using current settings for crop, ratio, scaler and subtitles.
- *  @return false if this could not be done.
- */
-bool
-Player::repeat_last_video ()
-{
-	if (!_last_process_video.image) {
-		return false;
+		list<ContentTextSubtitle> text = subtitle_decoder->get_text_subtitles (ContentTimePeriod (from, to), starting);
+		for (list<ContentTextSubtitle>::const_iterator i = text.begin(); i != text.end(); ++i) {
+			copy (i->subs.begin(), i->subs.end(), back_inserter (ps.text));
+		}
 	}
 
-	process_video (
-		_last_process_video.weak_piece,
-		_last_process_video.image,
-		_last_process_video.eyes,
-		_last_process_video.same,
-		_last_process_video.frame
-		);
-
-	return true;
+	return ps;
 }