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ass.c
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1 /*
2  * SSA/ASS common functions
3  * Copyright (c) 2010 Aurelien Jacobs <aurel@gnuage.org>
4  *
5  * This file is part of FFmpeg.
6  *
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.
11  *
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.
16  *
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
20  */
21 
22 #include "avcodec.h"
23 #include "ass.h"
24 #include "libavutil/avassert.h"
25 #include "libavutil/avstring.h"
26 #include "libavutil/bprint.h"
27 #include "libavutil/common.h"
28 
30  const char *font, int font_size,
31  int color, int back_color,
32  int bold, int italic, int underline,
33  int alignment)
34 {
36  "[Script Info]\r\n"
37  "ScriptType: v4.00+\r\n"
38  "\r\n"
39  "[V4+ Styles]\r\n"
40  "Format: Name, Fontname, Fontsize, PrimaryColour, SecondaryColour, OutlineColour, BackColour, Bold, Italic, Underline, BorderStyle, Outline, Shadow, Alignment, MarginL, MarginR, MarginV, AlphaLevel, Encoding\r\n"
41  "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"
42  "\r\n"
43  "[Events]\r\n"
44  "Format: Layer, Start, End, Style, Text\r\n",
45  font, font_size, color, color, back_color, back_color,
46  -bold, -italic, -underline, alignment);
47 
48  if (!avctx->subtitle_header)
49  return AVERROR(ENOMEM);
50  avctx->subtitle_header_size = strlen(avctx->subtitle_header);
51  return 0;
52 }
53 
55 {
64 }
65 
66 static void insert_ts(AVBPrint *buf, int ts)
67 {
68  if (ts == -1) {
69  av_bprintf(buf, "9:59:59.99,");
70  } else {
71  int h, m, s;
72 
73  h = ts/360000; ts -= 360000*h;
74  m = ts/ 6000; ts -= 6000*m;
75  s = ts/ 100; ts -= 100*s;
76  av_bprintf(buf, "%d:%02d:%02d.%02d,", h, m, s, ts);
77  }
78 }
79 
80 int ff_ass_add_rect(AVSubtitle *sub, const char *dialog,
81  int ts_start, int duration, int raw)
82 {
83  AVBPrint buf;
84  int ret, dlen;
85  AVSubtitleRect **rects;
86 
88  if (!raw || raw == 2) {
89  long int layer = 0;
90 
91  if (raw == 2) {
92  /* skip ReadOrder */
93  dialog = strchr(dialog, ',');
94  if (!dialog)
95  return AVERROR_INVALIDDATA;
96  dialog++;
97 
98  /* extract Layer or Marked */
99  layer = strtol(dialog, (char**)&dialog, 10);
100  if (*dialog != ',')
101  return AVERROR_INVALIDDATA;
102  dialog++;
103  }
104  av_bprintf(&buf, "Dialogue: %ld,", layer);
105  insert_ts(&buf, ts_start);
106  insert_ts(&buf, duration == -1 ? -1 : ts_start + duration);
107  if (raw != 2)
108  av_bprintf(&buf, "Default,");
109  }
110 
111  dlen = strcspn(dialog, "\n");
112  dlen += dialog[dlen] == '\n';
113 
114  av_bprintf(&buf, "%.*s", dlen, dialog);
115  if (raw == 2)
116  av_bprintf(&buf, "\r\n");
117  if (!av_bprint_is_complete(&buf))
118  return AVERROR(ENOMEM);
119 
120  rects = av_realloc(sub->rects, (sub->num_rects+1) * sizeof(*sub->rects));
121  if (!rects)
122  return AVERROR(ENOMEM);
123  sub->rects = rects;
124  sub->end_display_time = FFMAX(sub->end_display_time, 10 * duration);
125  rects[sub->num_rects] = av_mallocz(sizeof(*rects[0]));
126  rects[sub->num_rects]->type = SUBTITLE_ASS;
127  ret = av_bprint_finalize(&buf, &rects[sub->num_rects]->ass);
128  if (ret < 0)
129  return ret;
130  sub->num_rects++;
131  return dlen;
132 }