1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
|
/*
* SSA/ASS common functions
* Copyright (c) 2010 Aurelien Jacobs <aurel@gnuage.org>
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "avcodec.h"
#include "ass.h"
#include "libavutil/avassert.h"
#include "libavutil/avstring.h"
#include "libavutil/bprint.h"
#include "libavutil/common.h"
int ff_ass_subtitle_header(AVCodecContext *avctx,
const char *font, int font_size,
int color, int back_color,
int bold, int italic, int underline,
int alignment)
{
avctx->subtitle_header = av_asprintf(
"[Script Info]\r\n"
"; Script generated by FFmpeg/Lavc%s\r\n"
"ScriptType: v4.00+\r\n"
"PlayResX: 384\r\n"
"PlayResY: 288\r\n"
"\r\n"
"[V4+ Styles]\r\n"
/* ASSv4 header */
"Format: Name, "
"Fontname, Fontsize, "
"PrimaryColour, SecondaryColour, OutlineColour, BackColour, "
"Bold, Italic, Underline, StrikeOut, "
"ScaleX, ScaleY, "
"Spacing, Angle, "
"BorderStyle, Outline, Shadow, "
"Alignment, MarginL, MarginR, MarginV, "
"Encoding\r\n"
"Style: "
"Default," /* Name */
"%s,%d," /* Font{name,size} */
"&H%x,&H%x,&H%x,&H%x," /* {Primary,Secondary,Outline,Back}Colour */
"%d,%d,%d,0," /* Bold, Italic, Underline, StrikeOut */
"100,100," /* Scale{X,Y} */
"0,0," /* Spacing, Angle */
"1,1,0," /* BorderStyle, Outline, Shadow */
"%d,10,10,10," /* Alignment, Margin[LRV] */
"0\r\n" /* Encoding */
"\r\n"
"[Events]\r\n"
"Format: Layer, Start, End, Style, Name, MarginL, MarginR, MarginV, Effect, Text\r\n",
!(avctx->flags & CODEC_FLAG_BITEXACT) ? AV_STRINGIFY(LIBAVCODEC_VERSION) : "",
font, font_size, color, color, back_color, back_color,
-bold, -italic, -underline, alignment);
if (!avctx->subtitle_header)
return AVERROR(ENOMEM);
avctx->subtitle_header_size = strlen(avctx->subtitle_header);
return 0;
}
int ff_ass_subtitle_header_default(AVCodecContext *avctx)
{
return ff_ass_subtitle_header(avctx, ASS_DEFAULT_FONT,
ASS_DEFAULT_FONT_SIZE,
ASS_DEFAULT_COLOR,
ASS_DEFAULT_BACK_COLOR,
ASS_DEFAULT_BOLD,
ASS_DEFAULT_ITALIC,
ASS_DEFAULT_UNDERLINE,
ASS_DEFAULT_ALIGNMENT);
}
static void insert_ts(AVBPrint *buf, int ts)
{
if (ts == -1) {
av_bprintf(buf, "9:59:59.99,");
} else {
int h, m, s;
h = ts/360000; ts -= 360000*h;
m = ts/ 6000; ts -= 6000*m;
s = ts/ 100; ts -= 100*s;
av_bprintf(buf, "%d:%02d:%02d.%02d,", h, m, s, ts);
}
}
int ff_ass_bprint_dialog(AVBPrint *buf, const char *dialog,
int ts_start, int duration, int raw)
{
int dlen;
if (!raw || raw == 2) {
long int layer = 0;
if (raw == 2) {
/* skip ReadOrder */
dialog = strchr(dialog, ',');
if (!dialog)
return AVERROR_INVALIDDATA;
dialog++;
/* extract Layer or Marked */
layer = strtol(dialog, (char**)&dialog, 10);
if (*dialog != ',')
return AVERROR_INVALIDDATA;
dialog++;
}
av_bprintf(buf, "Dialogue: %ld,", layer);
insert_ts(buf, ts_start);
insert_ts(buf, duration == -1 ? -1 : ts_start + duration);
if (raw != 2)
av_bprintf(buf, "Default,,0,0,0,,");
}
dlen = strcspn(dialog, "\n");
dlen += dialog[dlen] == '\n';
av_bprintf(buf, "%.*s", dlen, dialog);
if (raw == 2)
av_bprintf(buf, "\r\n");
return dlen;
}
int ff_ass_add_rect(AVSubtitle *sub, const char *dialog,
int ts_start, int duration, int raw)
{
AVBPrint buf;
int ret, dlen;
AVSubtitleRect **rects;
av_bprint_init(&buf, 0, AV_BPRINT_SIZE_UNLIMITED);
if ((ret = ff_ass_bprint_dialog(&buf, dialog, ts_start, duration, raw)) < 0)
goto err;
dlen = ret;
if (!av_bprint_is_complete(&buf))
goto errnomem;
rects = av_realloc(sub->rects, (sub->num_rects+1) * sizeof(*sub->rects));
if (!rects)
goto errnomem;
sub->rects = rects;
sub->end_display_time = FFMAX(sub->end_display_time, 10 * duration);
rects[sub->num_rects] = av_mallocz(sizeof(*rects[0]));
rects[sub->num_rects]->type = SUBTITLE_ASS;
ret = av_bprint_finalize(&buf, &rects[sub->num_rects]->ass);
if (ret < 0)
goto err;
sub->num_rects++;
return dlen;
errnomem:
ret = AVERROR(ENOMEM);
err:
av_bprint_finalize(&buf, NULL);
return ret;
}
int ff_ass_add_rect_bprint(AVSubtitle *sub, const AVBPrint *buf,
int ts_start, int duration)
{
if (!av_bprint_is_complete(buf))
return AVERROR(ENOMEM);
return ff_ass_add_rect(sub, buf->str, ts_start, duration, 0);
}
void ff_ass_bprint_text_event(AVBPrint *buf, const char *p, int size,
const char *linebreaks, int keep_ass_markup)
{
const char *p_end = p + size;
for (; p < p_end && *p; p++) {
/* forced custom line breaks, not accounted as "normal" EOL */
if (linebreaks && strchr(linebreaks, *p)) {
av_bprintf(buf, "\\N");
/* standard ASS escaping so random characters don't get mis-interpreted
* as ASS */
} else if (!keep_ass_markup && strchr("{}\\", *p)) {
av_bprintf(buf, "\\%c", *p);
/* some packets might end abruptly (no \0 at the end, like for example
* in some cases of demuxing from a classic video container), some
* might be terminated with \n or \r\n which we have to remove (for
* consistency with those who haven't), and we also have to deal with
* evil cases such as \r at the end of the buffer (and no \0 terminated
* character) */
} else if (p[0] == '\n') {
/* some stuff left so we can insert a line break */
if (p < p_end - 1)
av_bprintf(buf, "\\N");
} else if (p[0] == '\r' && p < p_end - 1 && p[1] == '\n') {
/* \r followed by a \n, we can skip it. We don't insert the \N yet
* because we don't know if it is followed by more text */
continue;
/* finally, a sane character */
} else {
av_bprint_chars(buf, *p, 1);
}
}
av_bprintf(buf, "\r\n");
}
|
