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
|
/*
* Copyright (c) 2012 Clément Bœsch
*
* 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
*/
/**
* @file
* JACOsub subtitle decoder
* @see http://unicorn.us.com/jacosub/jscripts.html
*/
#include <time.h>
#include "ass.h"
#include "jacosub.h"
#include "libavutil/avstring.h"
#include "libavutil/bprint.h"
#include "libavutil/time_internal.h"
#undef time
static int insert_text(AVBPrint *dst, const char *in, const char *arg)
{
av_bprintf(dst, "%s", arg);
return 0;
}
static int insert_datetime(AVBPrint *dst, const char *in, const char *arg)
{
char buf[16] = {0};
time_t now = time(0);
struct tm ltime;
localtime_r(&now, <ime);
if (strftime(buf, sizeof(buf), arg, <ime))
av_bprintf(dst, "%s", buf);
return 0;
}
static int insert_color(AVBPrint *dst, const char *in, const char *arg)
{
return 1; // skip id
}
static int insert_font(AVBPrint *dst, const char *in, const char *arg)
{
return 1; // skip id
}
static const struct {
const char *from;
const char *arg;
int (*func)(AVBPrint *dst, const char *in, const char *arg);
} ass_codes_map[] = {
{"\\~", "~", insert_text}, // tilde doesn't need escaping
{"~", "{\\h}", insert_text}, // hard space
{"\\n", "\\N", insert_text}, // newline
{"\\D", "%d %b %Y", insert_datetime}, // current date
{"\\T", "%H:%M", insert_datetime}, // current time
{"\\N", "{\\r}", insert_text}, // reset to default style
{"\\I", "{\\i1}", insert_text}, // italic on
{"\\i", "{\\i0}", insert_text}, // italic off
{"\\B", "{\\b1}", insert_text}, // bold on
{"\\b", "{\\b0}", insert_text}, // bold off
{"\\U", "{\\u1}", insert_text}, // underline on
{"\\u", "{\\u0}", insert_text}, // underline off
{"\\C", "", insert_color}, // TODO: color
{"\\F", "", insert_font}, // TODO: font
};
enum {
ALIGN_VB = 1<<0, // vertical bottom, default
ALIGN_VM = 1<<1, // vertical middle
ALIGN_VT = 1<<2, // vertical top
ALIGN_JC = 1<<3, // justify center, default
ALIGN_JL = 1<<4, // justify left
ALIGN_JR = 1<<5, // justify right
};
static void jacosub_to_ass(AVCodecContext *avctx, AVBPrint *dst, const char *src)
{
int i, valign = 0, halign = 0;
char c = av_toupper(*src);
char directives[128] = {0};
/* extract the optional directives */
if ((c >= 'A' && c <= 'Z') || c == '[') {
char *p = directives;
char *pend = directives + sizeof(directives) - 1;
do *p++ = av_toupper(*src++);
while (*src && !jss_whitespace(*src) && p < pend);
*p = 0;
src = jss_skip_whitespace(src);
}
/* handle directives (TODO: handle more of them, and more reliably) */
if (strstr(directives, "VB")) valign = ALIGN_VB;
else if (strstr(directives, "VM")) valign = ALIGN_VM;
else if (strstr(directives, "VT")) valign = ALIGN_VT;
if (strstr(directives, "JC")) halign = ALIGN_JC;
else if (strstr(directives, "JL")) halign = ALIGN_JL;
else if (strstr(directives, "JR")) halign = ALIGN_JR;
if (valign || halign) {
if (!valign) valign = ALIGN_VB;
if (!halign) halign = ALIGN_JC;
switch (valign | halign) {
case ALIGN_VB | ALIGN_JL: av_bprintf(dst, "{\\an1}"); break; // bottom left
case ALIGN_VB | ALIGN_JC: av_bprintf(dst, "{\\an2}"); break; // bottom center
case ALIGN_VB | ALIGN_JR: av_bprintf(dst, "{\\an3}"); break; // bottom right
case ALIGN_VM | ALIGN_JL: av_bprintf(dst, "{\\an4}"); break; // middle left
case ALIGN_VM | ALIGN_JC: av_bprintf(dst, "{\\an5}"); break; // middle center
case ALIGN_VM | ALIGN_JR: av_bprintf(dst, "{\\an6}"); break; // middle right
case ALIGN_VT | ALIGN_JL: av_bprintf(dst, "{\\an7}"); break; // top left
case ALIGN_VT | ALIGN_JC: av_bprintf(dst, "{\\an8}"); break; // top center
case ALIGN_VT | ALIGN_JR: av_bprintf(dst, "{\\an9}"); break; // top right
}
}
/* process timed line */
while (*src && *src != '\n') {
/* text continue on the next line */
if (src[0] == '\\' && src[1] == '\n') {
src += 2;
while (jss_whitespace(*src))
src++;
continue;
}
/* special character codes */
for (i = 0; i < FF_ARRAY_ELEMS(ass_codes_map); i++) {
const char *from = ass_codes_map[i].from;
const char *arg = ass_codes_map[i].arg;
size_t codemap_len = strlen(from);
if (!strncmp(src, from, codemap_len)) {
src += codemap_len;
src += ass_codes_map[i].func(dst, src, arg);
break;
}
}
/* simple char copy */
if (i == FF_ARRAY_ELEMS(ass_codes_map))
av_bprintf(dst, "%c", *src++);
}
}
static int jacosub_decode_frame(AVCodecContext *avctx,
void *data, int *got_sub_ptr, AVPacket *avpkt)
{
int ret;
AVSubtitle *sub = data;
const char *ptr = avpkt->data;
FFASSDecoderContext *s = avctx->priv_data;
if (avpkt->size <= 0)
goto end;
if (*ptr) {
AVBPrint buffer;
// skip timers
ptr = jss_skip_whitespace(ptr);
ptr = strchr(ptr, ' '); if (!ptr) goto end; ptr++;
ptr = strchr(ptr, ' '); if (!ptr) goto end; ptr++;
av_bprint_init(&buffer, JSS_MAX_LINESIZE, JSS_MAX_LINESIZE);
jacosub_to_ass(avctx, &buffer, ptr);
ret = ff_ass_add_rect(sub, buffer.str, s->readorder++, 0, NULL, NULL);
av_bprint_finalize(&buffer, NULL);
if (ret < 0)
return ret;
}
end:
*got_sub_ptr = sub->num_rects > 0;
return avpkt->size;
}
AVCodec ff_jacosub_decoder = {
.name = "jacosub",
.long_name = NULL_IF_CONFIG_SMALL("JACOsub subtitle"),
.type = AVMEDIA_TYPE_SUBTITLE,
.id = AV_CODEC_ID_JACOSUB,
.init = ff_ass_subtitle_header_default,
.decode = jacosub_decode_frame,
.flush = ff_ass_decoder_flush,
.priv_data_size = sizeof(FFASSDecoderContext),
};
|
