1/*
2 * SSA/ASS common funtions
3 * Copyright (c) 2010  Aurelien Jacobs <aurel@gnuage.org>
4 *
5 * This file is part of Libav.
6 *
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.
11 *
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.
16 *
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
20 */
21
22#include "avcodec.h"
23#include "ass.h"
24#include "libavutil/avstring.h"
25
26/**
27 * Generate a suitable AVCodecContext.subtitle_header for SUBTITLE_ASS.
28 *
29 * @param avctx pointer to the AVCodecContext
30 * @param font name of the default font face to use
31 * @param font_size default font size to use
32 * @param color default text color to use (ABGR)
33 * @param back_color default background color to use (ABGR)
34 * @param bold 1 for bold text, 0 for normal text
35 * @param italic 1 for italic text, 0 for normal text
36 * @param underline 1 for underline text, 0 for normal text
37 * @param alignment position of the text (left, center, top...), defined after
38 *                  the layout of the numpad (1-3 sub, 4-6 mid, 7-9 top)
39 * @return >= 0 on success otherwise an error code <0
40 */
41static int ff_ass_subtitle_header(AVCodecContext *avctx,
42                                  const char *font, int font_size,
43                                  int color, int back_color,
44                                  int bold, int italic, int underline,
45                                  int alignment)
46{
47    char header[512];
48
49    snprintf(header, sizeof(header),
50             "[Script Info]\r\n"
51             "ScriptType: v4.00+\r\n"
52             "\r\n"
53             "[V4+ Styles]\r\n"
54             "Format: Name, Fontname, Fontsize, PrimaryColour, SecondaryColour, OutlineColour, BackColour, Bold, Italic, Underline, BorderStyle, Outline, Shadow, Alignment, MarginL, MarginR, MarginV, AlphaLevel, Encoding\r\n"
55             "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"
56             "\r\n"
57             "[Events]\r\n"
58             "Format: Layer, Start, End, Text\r\n",
59             font, font_size, color, color, back_color, back_color,
60             -bold, -italic, -underline, alignment);
61
62    avctx->subtitle_header = av_strdup(header);
63    if (!avctx->subtitle_header)
64        return AVERROR(ENOMEM);
65    avctx->subtitle_header_size = strlen(avctx->subtitle_header);
66    return 0;
67}
68
69int ff_ass_subtitle_header_default(AVCodecContext *avctx)
70{
71    return ff_ass_subtitle_header(avctx, ASS_DEFAULT_FONT,
72                                         ASS_DEFAULT_FONT_SIZE,
73                                         ASS_DEFAULT_COLOR,
74                                         ASS_DEFAULT_BACK_COLOR,
75                                         ASS_DEFAULT_BOLD,
76                                         ASS_DEFAULT_ITALIC,
77                                         ASS_DEFAULT_UNDERLINE,
78                                         ASS_DEFAULT_ALIGNMENT);
79}
80
81void ff_ass_init(AVSubtitle *sub)
82{
83    memset(sub, 0, sizeof(*sub));
84}
85
86static int ts_to_string(char *str, int strlen, int ts)
87{
88    int h, m, s;
89    h = ts/360000;  ts -= 360000*h;
90    m = ts/  6000;  ts -=   6000*m;
91    s = ts/   100;  ts -=    100*s;
92    return snprintf(str, strlen, "%d:%02d:%02d.%02d", h, m, s, ts);
93}
94
95int ff_ass_add_rect(AVSubtitle *sub, const char *dialog,
96                    int ts_start, int ts_end, int raw)
97{
98    int len = 0, dlen, duration = ts_end - ts_start;
99    char s_start[16], s_end[16], header[48] = {0};
100    AVSubtitleRect **rects;
101
102    if (!raw) {
103        ts_to_string(s_start, sizeof(s_start), ts_start);
104        ts_to_string(s_end,   sizeof(s_end),   ts_end  );
105        len = snprintf(header, sizeof(header), "Dialogue: 0,%s,%s,",
106                       s_start, s_end);
107    }
108
109    dlen = strcspn(dialog, "\n");
110    dlen += dialog[dlen] == '\n';
111
112    rects = av_realloc(sub->rects, (sub->num_rects+1) * sizeof(*sub->rects));
113    if (!rects)
114        return AVERROR(ENOMEM);
115    sub->rects = rects;
116    sub->end_display_time = FFMAX(sub->end_display_time, 10 * duration);
117    rects[sub->num_rects]       = av_mallocz(sizeof(*rects[0]));
118    rects[sub->num_rects]->type = SUBTITLE_ASS;
119    rects[sub->num_rects]->ass  = av_malloc(len + dlen + 1);
120    strcpy (rects[sub->num_rects]->ass      , header);
121    av_strlcpy(rects[sub->num_rects]->ass + len, dialog, dlen + 1);
122    sub->num_rects++;
123    return dlen;
124}
125