2 Copyright (C) 2012 Carl Hetherington <cth@carlh.net>
4 This program is free software; you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation; either version 2 of the License, or
7 (at your option) any later version.
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 GNU General Public License for more details.
14 You should have received a copy of the GNU General Public License
15 along with this program; if not, write to the Free Software
16 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
22 #include "exceptions.h"
25 using namespace boost;
27 Subtitle::Subtitle (AVSubtitle const & sub)
29 /* subtitle PTS in seconds */
30 float const packet_time = (sub.pts / AV_TIME_BASE) + float (sub.pts % AV_TIME_BASE) / 1e6;
32 /* hence start time for this sub */
33 _from = packet_time + (double (sub.start_display_time) / 1e3);
34 _to = packet_time + (double (sub.end_display_time) / 1e3);
36 for (unsigned int i = 0; i < sub.num_rects; ++i) {
37 _images.push_back (shared_ptr<SubtitleImage> (new SubtitleImage (sub.rects[i])));
41 /** @param t Time in seconds from the start of the film */
43 Subtitle::displayed_at (double t)
45 return t >= _from && t <= _to;
48 SubtitleImage::SubtitleImage (AVSubtitleRect const * rect)
49 : _position (rect->x, rect->y)
50 , _image (new SimpleImage (PIX_FMT_RGBA, Size (rect->w, rect->h)))
52 if (rect->type != SUBTITLE_BITMAP) {
53 throw DecodeError ("non-bitmap subtitles not yet supported");
56 /* Start of the first line in the subtitle */
57 uint8_t* sub_p = rect->pict.data[0];
58 /* sub_p looks up into a RGB palette which is here */
59 uint32_t const * palette = (uint32_t *) rect->pict.data[1];
60 /* Start of the output data */
61 uint32_t* out_p = (uint32_t *) _image->data()[0];
63 for (int y = 0; y < rect->h; ++y) {
64 uint8_t* sub_line_p = sub_p;
65 for (int x = 0; x < rect->w; ++x) {
66 *out_p++ = palette[*sub_line_p++];
68 sub_p += rect->pict.linesize[0];