2 * SSA/ASS common funtions
3 * Copyright (c) 2010 Aurelien Jacobs <aurel@gnuage.org>
5 * This file is part of Libav.
7 * Libav is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
12 * Libav is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with Libav; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
24 #include "libavutil/avstring.h"
25 #include "libavutil/common.h"
28 * Generate a suitable AVCodecContext.subtitle_header for SUBTITLE_ASS.
30 * @param avctx pointer to the AVCodecContext
31 * @param font name of the default font face to use
32 * @param font_size default font size to use
33 * @param color default text color to use (ABGR)
34 * @param back_color default background color to use (ABGR)
35 * @param bold 1 for bold text, 0 for normal text
36 * @param italic 1 for italic text, 0 for normal text
37 * @param underline 1 for underline text, 0 for normal text
38 * @param alignment position of the text (left, center, top...), defined after
39 * the layout of the numpad (1-3 sub, 4-6 mid, 7-9 top)
40 * @return >= 0 on success otherwise an error code <0
42 static int ass_subtitle_header(AVCodecContext *avctx,
43 const char *font, int font_size,
44 int color, int back_color,
45 int bold, int italic, int underline,
50 snprintf(header, sizeof(header),
52 "ScriptType: v4.00+\r\n"
55 "Format: Name, Fontname, Fontsize, PrimaryColour, SecondaryColour, OutlineColour, BackColour, Bold, Italic, Underline, BorderStyle, Outline, Shadow, Alignment, MarginL, MarginR, MarginV, AlphaLevel, Encoding\r\n"
56 "Style: Default,%s,%d,&H%x,&H%x,&H%x,&H%x,%d,%d,%d,1,1,0,%d,10,10,10,0,0\r\n"
59 "Format: Layer, Start, End, Text\r\n",
60 font, font_size, color, color, back_color, back_color,
61 -bold, -italic, -underline, alignment);
63 avctx->subtitle_header = av_strdup(header);
64 if (!avctx->subtitle_header)
65 return AVERROR(ENOMEM);
66 avctx->subtitle_header_size = strlen(avctx->subtitle_header);
70 int ff_ass_subtitle_header_default(AVCodecContext *avctx)
72 return ass_subtitle_header(avctx, ASS_DEFAULT_FONT,
73 ASS_DEFAULT_FONT_SIZE,
75 ASS_DEFAULT_BACK_COLOR,
78 ASS_DEFAULT_UNDERLINE,
79 ASS_DEFAULT_ALIGNMENT);
82 void ff_ass_init(AVSubtitle *sub)
84 memset(sub, 0, sizeof(*sub));
87 static int ts_to_string(char *str, int strlen, int ts)
90 h = ts/360000; ts -= 360000*h;
91 m = ts/ 6000; ts -= 6000*m;
92 s = ts/ 100; ts -= 100*s;
93 return snprintf(str, strlen, "%d:%02d:%02d.%02d", h, m, s, ts);
96 int ff_ass_add_rect(AVSubtitle *sub, const char *dialog,
97 int ts_start, int ts_end, int raw)
99 int len = 0, dlen, duration = ts_end - ts_start;
100 char s_start[16], s_end[16], header[48] = {0};
101 AVSubtitleRect **rects;
104 ts_to_string(s_start, sizeof(s_start), ts_start);
105 ts_to_string(s_end, sizeof(s_end), ts_end );
106 len = snprintf(header, sizeof(header), "Dialogue: 0,%s,%s,",
110 dlen = strcspn(dialog, "\n");
111 dlen += dialog[dlen] == '\n';
113 rects = av_realloc(sub->rects, (sub->num_rects+1) * sizeof(*sub->rects));
115 return AVERROR(ENOMEM);
117 sub->end_display_time = FFMAX(sub->end_display_time, 10 * duration);
118 rects[sub->num_rects] = av_mallocz(sizeof(*rects[0]));
119 rects[sub->num_rects]->type = SUBTITLE_ASS;
120 rects[sub->num_rects]->ass = av_malloc(len + dlen + 1);
121 strcpy (rects[sub->num_rects]->ass , header);
122 av_strlcpy(rects[sub->num_rects]->ass + len, dialog, dlen + 1);