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"
23 #include "film_state.h"
26 using namespace boost;
28 Subtitle::Subtitle (AVSubtitle const & sub)
30 /* subtitle PTS in seconds */
31 float const packet_time = (sub.pts / AV_TIME_BASE) + float (sub.pts % AV_TIME_BASE) / 1e6;
33 /* hence start time for this sub */
34 _from = packet_time + (double (sub.start_display_time) / 1e3);
35 _to = packet_time + (double (sub.end_display_time) / 1e3);
37 for (unsigned int i = 0; i < sub.num_rects; ++i) {
38 _images.push_back (shared_ptr<SubtitleImage> (new SubtitleImage (sub.rects[i])));
42 /** @param t Time in seconds from the start of the film */
44 Subtitle::displayed_at (double t)
46 return t >= _from && t <= _to;
49 SubtitleImage::SubtitleImage (AVSubtitleRect const * rect)
50 : _position (rect->x, rect->y)
51 , _image (new SimpleImage (PIX_FMT_RGBA, Size (rect->w, rect->h)))
53 if (rect->type != SUBTITLE_BITMAP) {
54 throw DecodeError ("non-bitmap subtitles not yet supported");
57 /* Start of the first line in the subtitle */
58 uint8_t* sub_p = rect->pict.data[0];
59 /* sub_p looks up into a RGB palette which is here */
60 uint32_t const * palette = (uint32_t *) rect->pict.data[1];
61 /* Start of the output data */
62 uint32_t* out_p = (uint32_t *) _image->data()[0];
64 for (int y = 0; y < rect->h; ++y) {
65 uint8_t* sub_line_p = sub_p;
66 for (int x = 0; x < rect->w; ++x) {
67 *out_p++ = palette[*sub_line_p++];
69 sub_p += rect->pict.linesize[0];
75 int target_base_width, int target_base_height,
76 float target_x_scale, float target_y_scale,
77 Position sub_pos, int sub_width, int sub_height,
78 shared_ptr<FilmState> fs
83 Rectangle sub_area (sub_pos.x, sub_pos.y + fs->subtitle_offset, sub_width, sub_height);
85 Rectangle cropped_target_area (
88 target_base_width - (fs->crop.left + fs->crop.right),
89 target_base_height - (fs->crop.top + fs->crop.bottom)
92 Rectangle cropped_sub_area = sub_area.intersection (cropped_target_area);
94 tx.crop.x = cropped_sub_area.x - sub_area.x;
95 tx.crop.y = cropped_sub_area.y - sub_area.y;
96 tx.crop.w = cropped_sub_area.w;
97 tx.crop.h = cropped_sub_area.h;
99 tx.transformed.w = cropped_sub_area.w * target_x_scale * fs->subtitle_scale;
100 tx.transformed.h = cropped_sub_area.h * target_y_scale * fs->subtitle_scale;
102 tx.transformed.x = target_x_scale * ((sub_area.x - fs->crop.left) + (cropped_sub_area.w * (1 - fs->subtitle_scale) / 2));
103 tx.transformed.y = target_y_scale * ((sub_area.y - fs->crop.top) + (cropped_sub_area.h * (1 - fs->subtitle_scale) / 2));