X-Git-Url: https://main.carlh.net/gitweb/?p=dcpomatic.git;a=blobdiff_plain;f=src%2Flib%2Fvideo_content.cc;h=cef543387dcbb8fda7fcbae9dc201e9794a2cfa1;hp=0a3e378eecb1fda2f05ef3b6894659c6849386fe;hb=3828baf56467224f5d44049bf1e7a7ed11f43a05;hpb=0f60e0f52c986f18764822de78b82b4163909f0c

diff --git a/src/lib/video_content.cc b/src/lib/video_content.cc
index 0a3e378ee..cef543387 100644
--- a/src/lib/video_content.cc
+++ b/src/lib/video_content.cc
@@ -1,27 +1,25 @@
 /*
-    Copyright (C) 2013-2014 Carl Hetherington <cth@carlh.net>
+    Copyright (C) 2013-2016 Carl Hetherington <cth@carlh.net>
 
-    This program is free software; you can redistribute it and/or modify
+    This file is part of DCP-o-matic.
+
+    DCP-o-matic is free software; you can redistribute it and/or modify
     it under the terms of the GNU General Public License as published by
     the Free Software Foundation; either version 2 of the License, or
     (at your option) any later version.
 
-    This program is distributed in the hope that it will be useful,
+    DCP-o-matic is distributed in the hope that it will be useful,
     but WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
     GNU General Public License for more details.
 
     You should have received a copy of the GNU General Public License
-    along with this program; if not, write to the Free Software
-    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+    along with DCP-o-matic.  If not, see <http://www.gnu.org/licenses/>.
 
 */
 
-#include <iomanip>
-#include <libcxml/cxml.h>
-#include <dcp/colour_matrix.h>
-#include <dcp/raw_convert.h>
 #include "video_content.h"
+#include "content.h"
 #include "video_examiner.h"
 #include "compose.hpp"
 #include "ratio.h"
@@ -32,77 +30,77 @@
 #include "exceptions.h"
 #include "frame_rate_change.h"
 #include "log.h"
+#include "safe_stringstream.h"
+#include "raw_convert.h"
+#include <libcxml/cxml.h>
+#include <dcp/colour_matrix.h>
+#include <libxml++/libxml++.h>
+#include <iomanip>
+#include <iostream>
 
 #include "i18n.h"
 
-#define LOG_GENERAL(...) film->log()->log (String::compose (__VA_ARGS__), Log::TYPE_GENERAL);
+#define LOG_GENERAL(...) _parent->film()->log()->log (String::compose (__VA_ARGS__), LogEntry::TYPE_GENERAL);
 
-int const VideoContentProperty::VIDEO_SIZE	  = 0;
-int const VideoContentProperty::VIDEO_FRAME_RATE  = 1;
-int const VideoContentProperty::VIDEO_FRAME_TYPE  = 2;
-int const VideoContentProperty::VIDEO_CROP	  = 3;
-int const VideoContentProperty::VIDEO_SCALE	  = 4;
-int const VideoContentProperty::COLOUR_CONVERSION = 5;
+int const VideoContentProperty::SIZE	  = 0;
+int const VideoContentProperty::FRAME_TYPE  = 1;
+int const VideoContentProperty::CROP	  = 2;
+int const VideoContentProperty::SCALE	  = 3;
+int const VideoContentProperty::COLOUR_CONVERSION = 4;
+int const VideoContentProperty::FADE_IN     = 5;
+int const VideoContentProperty::FADE_OUT    = 6;
 
 using std::string;
-using std::stringstream;
 using std::setprecision;
 using std::cout;
 using std::vector;
 using std::min;
 using std::max;
+using std::fixed;
+using std::setprecision;
+using std::list;
+using std::pair;
 using boost::shared_ptr;
 using boost::optional;
 using boost::dynamic_pointer_cast;
-using dcp::raw_convert;
-
-vector<VideoContentScale> VideoContentScale::_scales;
 
-VideoContent::VideoContent (shared_ptr<const Film> f)
-	: Content (f)
-	, _video_length (0)
-	, _video_frame_rate (0)
-	, _video_frame_type (VIDEO_FRAME_TYPE_2D)
-	, _scale (Config::instance()->default_scale ())
+VideoContent::VideoContent (Content* parent)
+	: ContentPart (parent)
+	, _length (0)
+	, _frame_type (VIDEO_FRAME_TYPE_2D)
+	, _scale (VideoContentScale (Ratio::from_id ("178")))
+	, _yuv (true)
+	, _fade_in (0)
+	, _fade_out (0)
 {
-	setup_default_colour_conversion ();
-}
 
-VideoContent::VideoContent (shared_ptr<const Film> f, DCPTime s, ContentTime len)
-	: Content (f, s)
-	, _video_length (len)
-	, _video_frame_rate (0)
-	, _video_frame_type (VIDEO_FRAME_TYPE_2D)
-	, _scale (Config::instance()->default_scale ())
-{
-	setup_default_colour_conversion ();
 }
 
-VideoContent::VideoContent (shared_ptr<const Film> f, boost::filesystem::path p)
-	: Content (f, p)
-	, _video_length (0)
-	, _video_frame_rate (0)
-	, _video_frame_type (VIDEO_FRAME_TYPE_2D)
-	, _scale (Config::instance()->default_scale ())
+shared_ptr<VideoContent>
+VideoContent::from_xml (Content* parent, cxml::ConstNodePtr node, int version)
 {
-	setup_default_colour_conversion ();
+	if (!node->optional_number_child<int> ("VideoWidth")) {
+		return shared_ptr<VideoContent> ();
+	}
+
+	return shared_ptr<VideoContent> (new VideoContent (parent, node, version));
 }
 
-VideoContent::VideoContent (shared_ptr<const Film> f, cxml::ConstNodePtr node, int version)
-	: Content (f, node)
+VideoContent::VideoContent (Content* parent, cxml::ConstNodePtr node, int version)
+	: ContentPart (parent)
 {
-	_video_size.width = node->number_child<int> ("VideoWidth");
-	_video_size.height = node->number_child<int> ("VideoHeight");
-	_video_frame_rate = node->number_child<float> ("VideoFrameRate");
+	_size.width = node->number_child<int> ("VideoWidth");
+	_size.height = node->number_child<int> ("VideoHeight");
 
-	if (version < 32) {
-		/* DCP-o-matic 1.0 branch */
-		_video_length = ContentTime::from_frames (node->number_child<int64_t> ("VideoLength"), _video_frame_rate);
-	} else {
-		_video_length = ContentTime (node->number_child<ContentTime::Type> ("VideoLength"));
+	/* Backwards compatibility */
+	optional<double> r = node->optional_number_child<double>("VideoFrameRate");
+	if (r) {
+		_parent->set_video_frame_rate (r.get ());
 	}
-	
-	_video_frame_type = static_cast<VideoFrameType> (node->number_child<int> ("VideoFrameType"));
+
+	_length = node->number_child<Frame> ("VideoLength");
+	_frame_type = static_cast<VideoFrameType> (node->number_child<int> ("VideoFrameType"));
+	_sample_aspect_ratio = node->optional_number_child<double> ("SampleAspectRatio");
 	_crop.left = node->number_child<int> ("LeftCrop");
 	_crop.right = node->number_child<int> ("RightCrop");
 	_crop.top = node->number_child<int> ("TopCrop");
@@ -116,239 +114,168 @@ VideoContent::VideoContent (shared_ptr<const Film> f, cxml::ConstNodePtr node, i
 	} else {
 		_scale = VideoContentScale (node->node_child ("Scale"));
 	}
-	
-	_colour_conversion = ColourConversion (node->node_child ("ColourConversion"));
+
+
+	if (node->optional_node_child ("ColourConversion")) {
+		_colour_conversion = ColourConversion (node->node_child ("ColourConversion"), version);
+	}
+
+	_yuv = node->optional_bool_child("YUV").get_value_or (true);
+
+	if (version >= 32) {
+		_fade_in = node->number_child<Frame> ("FadeIn");
+		_fade_out = node->number_child<Frame> ("FadeOut");
+	} else {
+		_fade_in = _fade_out = 0;
+	}
 }
 
-VideoContent::VideoContent (shared_ptr<const Film> f, vector<shared_ptr<Content> > c)
-	: Content (f, c)
-	, _video_length (0)
+VideoContent::VideoContent (Content* parent, vector<shared_ptr<Content> > c)
+	: ContentPart (parent)
+	, _length (0)
+	, _yuv (false)
 {
-	shared_ptr<VideoContent> ref = dynamic_pointer_cast<VideoContent> (c[0]);
-	assert (ref);
+	shared_ptr<VideoContent> ref = c[0]->video;
+	DCPOMATIC_ASSERT (ref);
 
-	for (size_t i = 0; i < c.size(); ++i) {
-		shared_ptr<VideoContent> vc = dynamic_pointer_cast<VideoContent> (c[i]);
+	for (size_t i = 1; i < c.size(); ++i) {
 
-		if (vc->video_size() != ref->video_size()) {
+		if (c[i]->video->size() != ref->size()) {
 			throw JoinError (_("Content to be joined must have the same picture size."));
 		}
 
-		if (vc->video_frame_rate() != ref->video_frame_rate()) {
-			throw JoinError (_("Content to be joined must have the same video frame rate."));
-		}
-
-		if (vc->video_frame_type() != ref->video_frame_type()) {
+		if (c[i]->video->frame_type() != ref->frame_type()) {
 			throw JoinError (_("Content to be joined must have the same video frame type."));
 		}
 
-		if (vc->crop() != ref->crop()) {
+		if (c[i]->video->crop() != ref->crop()) {
 			throw JoinError (_("Content to be joined must have the same crop."));
 		}
 
-		if (vc->scale() != ref->scale()) {
+		if (c[i]->video->scale() != ref->scale()) {
 			throw JoinError (_("Content to be joined must have the same scale setting."));
 		}
 
-		if (vc->colour_conversion() != ref->colour_conversion()) {
+		if (c[i]->video->colour_conversion() != ref->colour_conversion()) {
 			throw JoinError (_("Content to be joined must have the same colour conversion."));
 		}
 
-		_video_length += vc->video_length ();
+		if (c[i]->video->fade_in() != ref->fade_in() || c[i]->video->fade_out() != ref->fade_out()) {
+			throw JoinError (_("Content to be joined must have the same fades."));
+		}
+
+		_length += c[i]->video->length ();
+
+		if (c[i]->video->yuv ()) {
+			_yuv = true;
+		}
 	}
 
-	_video_size = ref->video_size ();
-	_video_frame_rate = ref->video_frame_rate ();
-	_video_frame_type = ref->video_frame_type ();
+	_size = ref->size ();
+	_frame_type = ref->frame_type ();
 	_crop = ref->crop ();
 	_scale = ref->scale ();
 	_colour_conversion = ref->colour_conversion ();
+	_fade_in = ref->fade_in ();
+	_fade_out = ref->fade_out ();
 }
 
 void
 VideoContent::as_xml (xmlpp::Node* node) const
 {
 	boost::mutex::scoped_lock lm (_mutex);
-	node->add_child("VideoLength")->add_child_text (raw_convert<string> (_video_length.get ()));
-	node->add_child("VideoWidth")->add_child_text (raw_convert<string> (_video_size.width));
-	node->add_child("VideoHeight")->add_child_text (raw_convert<string> (_video_size.height));
-	node->add_child("VideoFrameRate")->add_child_text (raw_convert<string> (_video_frame_rate));
-	node->add_child("VideoFrameType")->add_child_text (raw_convert<string> (static_cast<int> (_video_frame_type)));
+	node->add_child("VideoLength")->add_child_text (raw_convert<string> (_length));
+	node->add_child("VideoWidth")->add_child_text (raw_convert<string> (_size.width));
+	node->add_child("VideoHeight")->add_child_text (raw_convert<string> (_size.height));
+	node->add_child("VideoFrameType")->add_child_text (raw_convert<string> (static_cast<int> (_frame_type)));
+	if (_sample_aspect_ratio) {
+		node->add_child("SampleAspectRatio")->add_child_text (raw_convert<string> (_sample_aspect_ratio.get ()));
+	}
 	_crop.as_xml (node);
 	_scale.as_xml (node->add_child("Scale"));
-	_colour_conversion.as_xml (node->add_child("ColourConversion"));
-}
-
-void
-VideoContent::setup_default_colour_conversion ()
-{
-	_colour_conversion = PresetColourConversion (_("sRGB"), 2.4, true, dcp::colour_matrix::srgb_to_xyz, 2.6).conversion;
+	if (_colour_conversion) {
+		_colour_conversion.get().as_xml (node->add_child("ColourConversion"));
+	}
+	node->add_child("YUV")->add_child_text (_yuv ? "1" : "0");
+	node->add_child("FadeIn")->add_child_text (raw_convert<string> (_fade_in));
+	node->add_child("FadeOut")->add_child_text (raw_convert<string> (_fade_out));
 }
 
 void
-VideoContent::take_from_video_examiner (shared_ptr<VideoExaminer> d)
+VideoContent::take_from_examiner (shared_ptr<VideoExaminer> d)
 {
 	/* These examiner calls could call other content methods which take a lock on the mutex */
 	dcp::Size const vs = d->video_size ();
-	float const vfr = d->video_frame_rate ();
-	ContentTime vl = d->video_length ();
-
-	{
-		boost::mutex::scoped_lock lm (_mutex);
-		_video_size = vs;
-		_video_frame_rate = vfr;
-		_video_length = vl;
-	}
-
-	shared_ptr<const Film> film = _film.lock ();
-	assert (film);
-	LOG_GENERAL ("Video length obtained from header as %1 frames", _video_length.frames (_video_frame_rate));
-	
-	signal_changed (VideoContentProperty::VIDEO_SIZE);
-	signal_changed (VideoContentProperty::VIDEO_FRAME_RATE);
-	signal_changed (ContentProperty::LENGTH);
-}
-
-
-string
-VideoContent::information () const
-{
-	if (video_size().width == 0 || video_size().height == 0) {
-		return "";
-	}
-	
-	stringstream s;
-
-	s << String::compose (
-		_("%1x%2 pixels (%3:1)"),
-		video_size().width,
-		video_size().height,
-		setprecision (3), video_size().ratio ()
-		);
-	
-	return s.str ();
-}
-
-void
-VideoContent::set_left_crop (int c)
-{
-	{
-		boost::mutex::scoped_lock lm (_mutex);
-		
-		if (_crop.left == c) {
-			return;
-		}
-		
-		_crop.left = c;
-	}
-	
-	signal_changed (VideoContentProperty::VIDEO_CROP);
-}
-
-void
-VideoContent::set_right_crop (int c)
-{
-	{
-		boost::mutex::scoped_lock lm (_mutex);
-		if (_crop.right == c) {
-			return;
-		}
-		
-		_crop.right = c;
-	}
-	
-	signal_changed (VideoContentProperty::VIDEO_CROP);
-}
-
-void
-VideoContent::set_top_crop (int c)
-{
-	{
-		boost::mutex::scoped_lock lm (_mutex);
-		if (_crop.top == c) {
-			return;
-		}
-		
-		_crop.top = c;
-	}
-	
-	signal_changed (VideoContentProperty::VIDEO_CROP);
-}
+	Frame vl = d->video_length ();
+	optional<double> const ar = d->sample_aspect_ratio ();
+	bool const yuv = d->yuv ();
 
-void
-VideoContent::set_bottom_crop (int c)
-{
 	{
 		boost::mutex::scoped_lock lm (_mutex);
-		if (_crop.bottom == c) {
-			return;
-		}
-		
-		_crop.bottom = c;
+		_size = vs;
+		_length = vl;
+		_sample_aspect_ratio = ar;
+		_yuv = yuv;
+
+		/* Guess correct scale from size and sample aspect ratio */
+		_scale = VideoContentScale (
+			Ratio::nearest_from_ratio (double (_size.width) * ar.get_value_or (1) / _size.height)
+			);
 	}
 
-	signal_changed (VideoContentProperty::VIDEO_CROP);
-}
+	LOG_GENERAL ("Video length obtained from header as %1 frames", _length);
 
-void
-VideoContent::set_scale (VideoContentScale s)
-{
-	{
-		boost::mutex::scoped_lock lm (_mutex);
-		if (_scale == s) {
-			return;
-		}
-
-		_scale = s;
+	if (d->video_frame_rate()) {
+		_parent->set_video_frame_rate (d->video_frame_rate().get());
 	}
 
-	signal_changed (VideoContentProperty::VIDEO_SCALE);
+	_parent->signal_changed (VideoContentProperty::SIZE);
+	_parent->signal_changed (VideoContentProperty::SCALE);
+	_parent->signal_changed (ContentProperty::LENGTH);
 }
 
 /** @return string which includes everything about how this content looks */
 string
 VideoContent::identifier () const
 {
-	stringstream s;
-	s << Content::identifier()
-	  << "_" << crop().left
+	SafeStringStream s;
+	s << crop().left
 	  << "_" << crop().right
 	  << "_" << crop().top
 	  << "_" << crop().bottom
 	  << "_" << scale().id()
-	  << "_" << colour_conversion().identifier ();
+	  << "_" << _fade_in
+	  << "_" << _fade_out;
 
-	return s.str ();
-}
-
-void
-VideoContent::set_video_frame_type (VideoFrameType t)
-{
-	{
-		boost::mutex::scoped_lock lm (_mutex);
-		_video_frame_type = t;
+	if (colour_conversion()) {
+		s << "_" << colour_conversion().get().identifier ();
 	}
 
-	signal_changed (VideoContentProperty::VIDEO_FRAME_TYPE);
+	return s.str ();
 }
 
 string
 VideoContent::technical_summary () const
 {
-	return String::compose (
-		"video: length %1, size %2x%3, rate %4",
-		video_length_after_3d_combine().seconds(),
-		video_size().width,
-		video_size().height,
-		video_frame_rate()
+	string s = String::compose (
+		N_("video: length %1 frames, size %2x%3"),
+		length_after_3d_combine(),
+		size().width,
+		size().height
 		);
+
+	if (sample_aspect_ratio ()) {
+		s += String::compose (N_(", sample aspect ratio %1"), (sample_aspect_ratio().get ()));
+	}
+
+	return s;
 }
 
 dcp::Size
-VideoContent::video_size_after_3d_split () const
+VideoContent::size_after_3d_split () const
 {
-	dcp::Size const s = video_size ();
-	switch (video_frame_type ()) {
+	dcp::Size const s = size ();
+	switch (frame_type ()) {
 	case VIDEO_FRAME_TYPE_2D:
 	case VIDEO_FRAME_TYPE_3D_ALTERNATE:
 	case VIDEO_FRAME_TYPE_3D_LEFT:
@@ -360,47 +287,25 @@ VideoContent::video_size_after_3d_split () const
 		return dcp::Size (s.width, s.height / 2);
 	}
 
-	assert (false);
-}
-
-void
-VideoContent::set_colour_conversion (ColourConversion c)
-{
-	{
-		boost::mutex::scoped_lock lm (_mutex);
-		_colour_conversion = c;
-	}
-
-	signal_changed (VideoContentProperty::COLOUR_CONVERSION);
+	DCPOMATIC_ASSERT (false);
 }
 
 /** @return Video size after 3D split and crop */
 dcp::Size
-VideoContent::video_size_after_crop () const
+VideoContent::size_after_crop () const
 {
-	return crop().apply (video_size_after_3d_split ());
-}
-
-/** @param t A time offset from the start of this piece of content.
- *  @return Corresponding time with respect to the content.
- */
-ContentTime
-VideoContent::dcp_time_to_content_time (DCPTime t) const
-{
-	shared_ptr<const Film> film = _film.lock ();
-	assert (film);
-	return ContentTime (t, FrameRateChange (video_frame_rate(), film->video_frame_rate()));
+	return crop().apply (size_after_3d_split ());
 }
 
 void
 VideoContent::scale_and_crop_to_fit_width ()
 {
-	shared_ptr<const Film> film = _film.lock ();
-	assert (film);
-
+	shared_ptr<const Film> film = _parent->film ();
 	set_scale (VideoContentScale (film->container ()));
 
-	int const crop = max (0, int (video_size().height - double (film->frame_size().height) * video_size().width / film->frame_size().width));
+	int const crop = max (0, int (size().height - double (film->frame_size().height) * size().width / film->frame_size().width));
+	set_left_crop (0);
+	set_right_crop (0);
 	set_top_crop (crop / 2);
 	set_bottom_crop (crop / 2);
 }
@@ -408,148 +313,168 @@ VideoContent::scale_and_crop_to_fit_width ()
 void
 VideoContent::scale_and_crop_to_fit_height ()
 {
-	shared_ptr<const Film> film = _film.lock ();
-	assert (film);
-
+	shared_ptr<const Film> film = _parent->film ();
 	set_scale (VideoContentScale (film->container ()));
 
-	int const crop = max (0, int (video_size().width - double (film->frame_size().width) * video_size().height / film->frame_size().height));
+	int const crop = max (0, int (size().width - double (film->frame_size().width) * size().height / film->frame_size().height));
 	set_left_crop (crop / 2);
 	set_right_crop (crop / 2);
+	set_top_crop (0);
+	set_bottom_crop (0);
 }
 
-void
-VideoContent::set_video_frame_rate (float r)
+/** @param f Frame index within the whole (untrimmed) content */
+optional<double>
+VideoContent::fade (Frame f) const
 {
-	{
-		boost::mutex::scoped_lock lm (_mutex);
-		if (_video_frame_rate == r) {
-			return;
-		}
-		
-		_video_frame_rate = r;
+	DCPOMATIC_ASSERT (f >= 0);
+
+	shared_ptr<const Film> film = _parent->film ();
+
+	double const vfr = _parent->active_video_frame_rate ();
+
+	Frame const ts = _parent->trim_start().frames_round(vfr);
+	if ((f - ts) < fade_in()) {
+		return double (f - ts) / fade_in();
 	}
-	
-	signal_changed (VideoContentProperty::VIDEO_FRAME_RATE);
-}
 
-VideoContentScale::VideoContentScale (Ratio const * r)
-	: _ratio (r)
-	, _scale (true)
-{
+	Frame fade_out_start = length() - _parent->trim_end().frames_round(vfr) - fade_out();
+	if (f >= fade_out_start) {
+		return 1 - double (f - fade_out_start) / fade_out();
+	}
 
+	return optional<double> ();
 }
 
-VideoContentScale::VideoContentScale ()
-	: _ratio (0)
-	, _scale (false)
+string
+VideoContent::processing_description () const
 {
+	/* stringstream is OK here as this string is just for presentation to the user */
+	SafeStringStream d;
 
-}
+	if (size().width && size().height) {
+		d << String::compose (
+			_("Content video is %1x%2"),
+			size_after_3d_split().width,
+			size_after_3d_split().height
+			);
 
-VideoContentScale::VideoContentScale (bool scale)
-	: _ratio (0)
-	, _scale (scale)
-{
 
-}
+		double ratio = size_after_3d_split().ratio ();
 
-VideoContentScale::VideoContentScale (cxml::NodePtr node)
-	: _ratio (0)
-	, _scale (true)
-{
-	optional<string> r = node->optional_string_child ("Ratio");
-	if (r) {
-		_ratio = Ratio::from_id (r.get ());
-	} else {
-		_scale = node->bool_child ("Scale");
+		if (sample_aspect_ratio ()) {
+			d << ", " << _("pixel aspect ratio") << " " << fixed << setprecision(2) << sample_aspect_ratio().get () << ":1";
+			ratio *= sample_aspect_ratio().get ();
+		}
+
+		d << "\n" << _("Display aspect ratio") << " " << fixed << setprecision(2) << ratio << ":1\n";
+	}
+
+	if ((crop().left || crop().right || crop().top || crop().bottom) && size() != dcp::Size (0, 0)) {
+		dcp::Size cropped = size_after_crop ();
+		d << String::compose (
+			_("Cropped to %1x%2"),
+			cropped.width, cropped.height
+			);
+
+		d << " (" << fixed << setprecision(2) << cropped.ratio () << ":1)\n";
+	}
+
+	shared_ptr<const Film> film = _parent->film ();
+	dcp::Size const container_size = film->frame_size ();
+	dcp::Size const scaled = scale().size (shared_from_this(), container_size, container_size);
+
+	if (scaled != size_after_crop ()) {
+		d << String::compose (
+			_("Scaled to %1x%2"),
+			scaled.width, scaled.height
+			);
+
+		d << " (" << fixed << setprecision(2) << scaled.ratio() << ":1)\n";
+	}
+
+	if (scaled != container_size) {
+		d << String::compose (
+			_("Padded with black to fit container %1 (%2x%3)"),
+			film->container()->nickname (),
+			container_size.width, container_size.height
+			);
+
+		d << " (" << fixed << setprecision(2) << container_size.ratio () << ":1)\n";
 	}
+
+	return d.str ();
 }
 
 void
-VideoContentScale::as_xml (xmlpp::Node* node) const
+VideoContent::add_properties (list<UserProperty>& p) const
 {
-	if (_ratio) {
-		node->add_child("Ratio")->add_child_text (_ratio->id ());
-	} else {
-		node->add_child("Scale")->add_child_text (_scale ? "1" : "0");
-	}
+	p.push_back (UserProperty (_("Video"), _("Length"), raw_convert<string> (length ()), _("video frames")));
+	p.push_back (UserProperty (_("Video"), _("Size"), raw_convert<string> (size().width) + "x" + raw_convert<string> (size().height)));
 }
 
-string
-VideoContentScale::id () const
+void
+VideoContent::set_length (Frame len)
 {
-	stringstream s;
-	
-	if (_ratio) {
-		s << _ratio->id () << "_";
-	} else {
-		s << (_scale ? "S1" : "S0");
-	}
-	
-	return s.str ();
+	maybe_set (_length, len, ContentProperty::LENGTH);
 }
 
-string
-VideoContentScale::name () const
+void
+VideoContent::set_left_crop (int c)
 {
-	if (_ratio) {
-		return _ratio->nickname ();
-	}
-
-	if (_scale) {
-		return _("No stretch");
-	}
+	maybe_set (_crop.left, c, VideoContentProperty::CROP);
+}
 
-	return _("No scale");
+void
+VideoContent::set_right_crop (int c)
+{
+	maybe_set (_crop.right, c, VideoContentProperty::CROP);
 }
 
-/** @param display_container Size of the container that we are displaying this content in.
- *  @param film_container The size of the film's image.
- */
-dcp::Size
-VideoContentScale::size (shared_ptr<const VideoContent> c, dcp::Size display_container, dcp::Size film_container, int round) const
+void
+VideoContent::set_top_crop (int c)
 {
-	if (_ratio) {
-		return fit_ratio_within (_ratio->ratio (), display_container, round);
-	}
+	maybe_set (_crop.top, c, VideoContentProperty::CROP);
+}
 
-	dcp::Size const ac = c->video_size_after_crop ();
+void
+VideoContent::set_bottom_crop (int c)
+{
+	maybe_set (_crop.bottom, c, VideoContentProperty::CROP);
+}
 
-	/* Force scale if the film_container is smaller than the content's image */
-	if (_scale || film_container.width < ac.width || film_container.height < ac.height) {
-		return fit_ratio_within (ac.ratio (), display_container, 1);
-	}
+void
+VideoContent::set_scale (VideoContentScale s)
+{
+	maybe_set (_scale, s, VideoContentProperty::SCALE);
+}
 
-	/* Scale the image so that it will be in the right place in film_container, even if display_container is a
-	   different size.
-	*/
-	return dcp::Size (
-		round_to (c->video_size().width  * float(display_container.width)  / film_container.width, round),
-		round_to (c->video_size().height * float(display_container.height) / film_container.height, round)
-		);
+void
+VideoContent::set_frame_type (VideoFrameType t)
+{
+	maybe_set (_frame_type, t, VideoContentProperty::FRAME_TYPE);
 }
 
 void
-VideoContentScale::setup_scales ()
+VideoContent::unset_colour_conversion ()
 {
-	vector<Ratio const *> ratios = Ratio::all ();
-	for (vector<Ratio const *>::const_iterator i = ratios.begin(); i != ratios.end(); ++i) {
-		_scales.push_back (VideoContentScale (*i));
-	}
+	maybe_set (_colour_conversion, boost::optional<ColourConversion> (), VideoContentProperty::COLOUR_CONVERSION);
+}
 
-	_scales.push_back (VideoContentScale (true));
-	_scales.push_back (VideoContentScale (false));
+void
+VideoContent::set_colour_conversion (ColourConversion c)
+{
+	maybe_set (_colour_conversion, c, VideoContentProperty::COLOUR_CONVERSION);
 }
 
-bool
-operator== (VideoContentScale const & a, VideoContentScale const & b)
+void
+VideoContent::set_fade_in (Frame t)
 {
-	return (a.ratio() == b.ratio() && a.scale() == b.scale());
+	maybe_set (_fade_in, t, VideoContentProperty::FADE_IN);
 }
 
-bool
-operator!= (VideoContentScale const & a, VideoContentScale const & b)
+void
+VideoContent::set_fade_out (Frame t)
 {
-	return (a.ratio() != b.ratio() || a.scale() != b.scale());
+	maybe_set (_fade_out, t, VideoContentProperty::FADE_OUT);
 }