2 Copyright (C) 2013-2017 Carl Hetherington <cth@carlh.net>
4 This file is part of DCP-o-matic.
6 DCP-o-matic is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2 of the License, or
9 (at your option) any later version.
11 DCP-o-matic is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with DCP-o-matic. If not, see <http://www.gnu.org/licenses/>.
21 #include "text_decoder.h"
22 #include "text_content.h"
25 #include "compose.hpp"
26 #include <sub/subtitle.h>
27 #include <boost/shared_ptr.hpp>
28 #include <boost/foreach.hpp>
29 #include <boost/algorithm/string.hpp>
37 using boost::shared_ptr;
38 using boost::optional;
39 using boost::function;
40 using namespace dcpomatic;
42 TextDecoder::TextDecoder (
44 shared_ptr<const TextContent> c,
47 : DecoderPart (parent)
54 /** Called by subclasses when an image subtitle is starting.
55 * @param from From time of the subtitle.
56 * @param image Subtitle image.
57 * @param rect Area expressed as a fraction of the video frame that this subtitle
58 * is for (e.g. a width of 0.5 means the width of the subtitle is half the width
62 TextDecoder::emit_bitmap_start (ContentTime from, shared_ptr<Image> image, dcpomatic::Rect<double> rect)
64 BitmapStart (ContentBitmapText (from, image, rect));
69 TextDecoder::emit_plain_start (ContentTime from, list<dcp::SubtitleString> s)
71 BOOST_FOREACH (dcp::SubtitleString& i, s) {
72 /* We must escape < and > in strings, otherwise they might confuse our subtitle
73 renderer (which uses some HTML-esque markup to do bold/italic etc.)
76 boost::algorithm::replace_all (t, "<", "<");
77 boost::algorithm::replace_all (t, ">", ">");
80 /* Set any forced appearance */
81 if (content()->colour()) {
82 i.set_colour (*content()->colour());
84 if (content()->effect_colour()) {
85 i.set_effect_colour (*content()->effect_colour());
87 if (content()->effect()) {
88 i.set_effect (*content()->effect());
90 if (content()->fade_in()) {
91 i.set_fade_up_time (dcp::Time(content()->fade_in()->seconds(), 1000));
93 if (content()->fade_out()) {
94 i.set_fade_down_time (dcp::Time(content()->fade_out()->seconds(), 1000));
98 PlainStart (ContentStringText (from, s));
103 TextDecoder::emit_plain_start (ContentTime from, sub::Subtitle const & subtitle)
105 /* See if our next subtitle needs to be vertically placed on screen by us */
106 bool needs_placement = false;
107 optional<int> bottom_line;
108 BOOST_FOREACH (sub::Line i, subtitle.lines) {
109 if (!i.vertical_position.reference || (i.vertical_position.line && !i.vertical_position.lines) || i.vertical_position.reference.get() == sub::TOP_OF_SUBTITLE) {
110 needs_placement = true;
111 if (!bottom_line || bottom_line.get() < i.vertical_position.line.get()) {
112 bottom_line = i.vertical_position.line.get();
117 /* Find the lowest proportional position */
118 optional<float> lowest_proportional;
119 BOOST_FOREACH (sub::Line i, subtitle.lines) {
120 if (i.vertical_position.proportional) {
121 if (!lowest_proportional) {
122 lowest_proportional = i.vertical_position.proportional;
124 lowest_proportional = min (lowest_proportional.get(), i.vertical_position.proportional.get());
129 list<dcp::SubtitleString> out;
130 BOOST_FOREACH (sub::Line i, subtitle.lines) {
131 BOOST_FOREACH (sub::Block j, i.blocks) {
133 if (!j.font_size.specified()) {
134 /* Fallback default font size if no other has been specified */
135 j.font_size.set_points (48);
140 if (needs_placement) {
141 DCPOMATIC_ASSERT (i.vertical_position.line);
142 /* This 1.015 is an arbitrary value to lift the bottom sub off the bottom
143 of the screen a bit to a pleasing degree.
146 (1 + bottom_line.get() - i.vertical_position.line.get())
147 * 1.2 * content()->line_spacing() * content()->y_scale() * j.font_size.proportional (72 * 11);
149 v_align = dcp::VALIGN_TOP;
151 DCPOMATIC_ASSERT (i.vertical_position.reference);
152 if (i.vertical_position.proportional) {
153 v_position = i.vertical_position.proportional.get();
155 DCPOMATIC_ASSERT (i.vertical_position.line);
156 DCPOMATIC_ASSERT (i.vertical_position.lines);
157 v_position = float(*i.vertical_position.line) / *i.vertical_position.lines;
160 if (lowest_proportional) {
161 /* Adjust line spacing */
162 v_position = ((v_position - lowest_proportional.get()) * content()->line_spacing()) + lowest_proportional.get();
165 switch (i.vertical_position.reference.get()) {
166 case sub::TOP_OF_SCREEN:
167 v_align = dcp::VALIGN_TOP;
169 case sub::VERTICAL_CENTRE_OF_SCREEN:
170 v_align = dcp::VALIGN_CENTER;
172 case sub::BOTTOM_OF_SCREEN:
173 v_align = dcp::VALIGN_BOTTOM;
176 v_align = dcp::VALIGN_TOP;
182 float h_position = i.horizontal_position.proportional;
183 switch (i.horizontal_position.reference) {
184 case sub::LEFT_OF_SCREEN:
185 h_align = dcp::HALIGN_LEFT;
186 h_position = max(h_position, 0.05f);
188 case sub::HORIZONTAL_CENTRE_OF_SCREEN:
189 h_align = dcp::HALIGN_CENTER;
191 case sub::RIGHT_OF_SCREEN:
192 h_align = dcp::HALIGN_RIGHT;
193 h_position = max(h_position, 0.05f);
196 h_align = dcp::HALIGN_CENTER;
200 /* The idea here (rightly or wrongly) is that we set the appearance based on the
201 values in the libsub objects, and these are overridden with values from the
202 content by the other emit_plain_start() above.
206 dcp::SubtitleString (
207 string(TEXT_FONT_ID),
212 j.font_size.points (72 * 11),
214 dcp::Time (from.seconds(), 1000),
215 /* XXX: hmm; this is a bit ugly (we don't know the to time yet) */
224 j.effect_colour.get_value_or(sub::Colour(0, 0, 0)).dcp(),
225 /* Hack: we should use subtitle.fade_up and subtitle.fade_down here
226 but the times of these often don't have a frame rate associated
227 with them so the sub::Time won't convert them to milliseconds without
228 throwing an exception. Since only DCP subs fill those in (and we don't
229 use libsub for DCP subs) we can cheat by just putting 0 in here.
238 emit_plain_start (from, out);
242 TextDecoder::emit_stop (ContentTime to)
248 TextDecoder::emit_plain (ContentTimePeriod period, list<dcp::SubtitleString> s)
250 emit_plain_start (period.from, s);
251 emit_stop (period.to);
255 TextDecoder::emit_plain (ContentTimePeriod period, sub::Subtitle const & s)
257 emit_plain_start (period.from, s);
258 emit_stop (period.to);
261 /* @param rect Area expressed as a fraction of the video frame that this subtitle
262 * is for (e.g. a width of 0.5 means the width of the subtitle is half the width
263 * of the video frame)
266 TextDecoder::emit_bitmap (ContentTimePeriod period, shared_ptr<Image> image, dcpomatic::Rect<double> rect)
268 emit_bitmap_start (period.from, image, rect);
269 emit_stop (period.to);
275 _position = ContentTime ();