2 * SSA/ASS common functions
3 * Copyright (c) 2010 Aurelien Jacobs <aurel@gnuage.org>
5 * This file is part of FFmpeg.
7 * FFmpeg 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 * FFmpeg 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 FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
24 #include "libavutil/avassert.h"
25 #include "libavutil/avstring.h"
26 #include "libavutil/bprint.h"
27 #include "libavutil/common.h"
29 int ff_ass_subtitle_header(AVCodecContext *avctx,
30 const char *font, int font_size,
31 int color, int back_color,
32 int bold, int italic, int underline,
35 avctx->subtitle_header = av_asprintf(
37 "ScriptType: v4.00+\r\n"
42 "Format: Name, Fontname, Fontsize, PrimaryColour, SecondaryColour, OutlineColour, BackColour, Bold, Italic, Underline, BorderStyle, Outline, Shadow, Alignment, MarginL, MarginR, MarginV, AlphaLevel, Encoding\r\n"
43 "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"
46 "Format: Layer, Start, End, Style, Text\r\n",
47 font, font_size, color, color, back_color, back_color,
48 -bold, -italic, -underline, alignment);
50 if (!avctx->subtitle_header)
51 return AVERROR(ENOMEM);
52 avctx->subtitle_header_size = strlen(avctx->subtitle_header);
56 int ff_ass_subtitle_header_default(AVCodecContext *avctx)
58 return ff_ass_subtitle_header(avctx, ASS_DEFAULT_FONT,
59 ASS_DEFAULT_FONT_SIZE,
61 ASS_DEFAULT_BACK_COLOR,
64 ASS_DEFAULT_UNDERLINE,
65 ASS_DEFAULT_ALIGNMENT);
68 static void insert_ts(AVBPrint *buf, int ts)
71 av_bprintf(buf, "9:59:59.99,");
75 h = ts/360000; ts -= 360000*h;
76 m = ts/ 6000; ts -= 6000*m;
77 s = ts/ 100; ts -= 100*s;
78 av_bprintf(buf, "%d:%02d:%02d.%02d,", h, m, s, ts);
82 int ff_ass_bprint_dialog(AVBPrint *buf, const char *dialog,
83 int ts_start, int duration, int raw)
87 if (!raw || raw == 2) {
92 dialog = strchr(dialog, ',');
94 return AVERROR_INVALIDDATA;
97 /* extract Layer or Marked */
98 layer = strtol(dialog, (char**)&dialog, 10);
100 return AVERROR_INVALIDDATA;
103 av_bprintf(buf, "Dialogue: %ld,", layer);
104 insert_ts(buf, ts_start);
105 insert_ts(buf, duration == -1 ? -1 : ts_start + duration);
107 av_bprintf(buf, "Default,");
110 dlen = strcspn(dialog, "\n");
111 dlen += dialog[dlen] == '\n';
113 av_bprintf(buf, "%.*s", dlen, dialog);
115 av_bprintf(buf, "\r\n");
120 int ff_ass_add_rect(AVSubtitle *sub, const char *dialog,
121 int ts_start, int duration, int raw)
125 AVSubtitleRect **rects;
127 av_bprint_init(&buf, 0, AV_BPRINT_SIZE_UNLIMITED);
128 if ((ret = ff_ass_bprint_dialog(&buf, dialog, ts_start, duration, raw)) < 0)
131 if (!av_bprint_is_complete(&buf))
134 rects = av_realloc(sub->rects, (sub->num_rects+1) * sizeof(*sub->rects));
138 sub->end_display_time = FFMAX(sub->end_display_time, 10 * duration);
139 rects[sub->num_rects] = av_mallocz(sizeof(*rects[0]));
140 rects[sub->num_rects]->type = SUBTITLE_ASS;
141 ret = av_bprint_finalize(&buf, &rects[sub->num_rects]->ass);
148 ret = AVERROR(ENOMEM);
150 av_bprint_finalize(&buf, NULL);
154 void ff_ass_bprint_text_event(AVBPrint *buf, const char *p, int size,
155 const char *linebreaks, int keep_ass_markup)
157 const char *p_end = p + size;
159 for (; p < p_end && *p; p++) {
161 /* forced custom line breaks, not accounted as "normal" EOL */
162 if (linebreaks && strchr(linebreaks, *p)) {
163 av_bprintf(buf, "\\N");
165 /* standard ASS escaping so random characters don't get mis-interpreted
167 } else if (!keep_ass_markup && strchr("{}\\", *p)) {
168 av_bprintf(buf, "\\%c", *p);
170 /* some packets might end abruptly (no \0 at the end, like for example
171 * in some cases of demuxing from a classic video container), some
172 * might be terminated with \n or \r\n which we have to remove (for
173 * consistency with those who haven't), and we also have to deal with
174 * evil cases such as \r at the end of the buffer (and no \0 terminated
176 } else if (p[0] == '\n') {
177 /* some stuff left so we can insert a line break */
179 av_bprintf(buf, "\\N");
180 } else if (p[0] == '\r' && p < p_end - 1 && p[1] == '\n') {
181 /* \r followed by a \n, we can skip it. We don't insert the \N yet
182 * because we don't know if it is followed by more text */
185 /* finally, a sane character */
187 av_bprint_chars(buf, *p, 1);
190 av_bprintf(buf, "\r\n");