1 /*
2 * Copyright (c) 2012 Clément Bœsch
3 *
4 * This file is part of FFmpeg.
5 *
6 * FFmpeg is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
10 *
11 * FFmpeg is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
15 *
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with FFmpeg; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19 */
20
21 /**
22 * @file
23 * JACOsub subtitle decoder
24 * @see http://unicorn.us.com/jacosub/jscripts.html
25 */
26
27 #include <time.h>
28 #include "ass.h"
29 #include "jacosub.h"
30 #include "libavutil/avstring.h"
31 #include "libavutil/bprint.h"
32 #include "libavutil/time_internal.h"
33
34 #undef time
35
insert_text(AVBPrint * dst,const char * in,const char * arg)36 static int insert_text(AVBPrint *dst, const char *in, const char *arg)
37 {
38 av_bprintf(dst, "%s", arg);
39 return 0;
40 }
41
insert_datetime(AVBPrint * dst,const char * in,const char * arg)42 static int insert_datetime(AVBPrint *dst, const char *in, const char *arg)
43 {
44 char buf[16] = {0};
45 time_t now = time(0);
46 struct tm ltime;
47
48 localtime_r(&now, <ime);
49 if (strftime(buf, sizeof(buf), arg, <ime))
50 av_bprintf(dst, "%s", buf);
51 return 0;
52 }
53
insert_color(AVBPrint * dst,const char * in,const char * arg)54 static int insert_color(AVBPrint *dst, const char *in, const char *arg)
55 {
56 return 1; // skip id
57 }
58
insert_font(AVBPrint * dst,const char * in,const char * arg)59 static int insert_font(AVBPrint *dst, const char *in, const char *arg)
60 {
61 return 1; // skip id
62 }
63
64 static const struct {
65 const char *from;
66 const char *arg;
67 int (*func)(AVBPrint *dst, const char *in, const char *arg);
68 } ass_codes_map[] = {
69 {"\\~", "~", insert_text}, // tilde doesn't need escaping
70 {"~", "{\\h}", insert_text}, // hard space
71 {"\\n", "\\N", insert_text}, // newline
72 {"\\D", "%d %b %Y", insert_datetime}, // current date
73 {"\\T", "%H:%M", insert_datetime}, // current time
74 {"\\N", "{\\r}", insert_text}, // reset to default style
75 {"\\I", "{\\i1}", insert_text}, // italic on
76 {"\\i", "{\\i0}", insert_text}, // italic off
77 {"\\B", "{\\b1}", insert_text}, // bold on
78 {"\\b", "{\\b0}", insert_text}, // bold off
79 {"\\U", "{\\u1}", insert_text}, // underline on
80 {"\\u", "{\\u0}", insert_text}, // underline off
81 {"\\C", "", insert_color}, // TODO: color
82 {"\\F", "", insert_font}, // TODO: font
83 };
84
85 enum {
86 ALIGN_VB = 1<<0, // vertical bottom, default
87 ALIGN_VM = 1<<1, // vertical middle
88 ALIGN_VT = 1<<2, // vertical top
89 ALIGN_JC = 1<<3, // justify center, default
90 ALIGN_JL = 1<<4, // justify left
91 ALIGN_JR = 1<<5, // justify right
92 };
93
jacosub_to_ass(AVCodecContext * avctx,AVBPrint * dst,const char * src)94 static void jacosub_to_ass(AVCodecContext *avctx, AVBPrint *dst, const char *src)
95 {
96 int i, valign = 0, halign = 0;
97 char c = av_toupper(*src);
98 char directives[128] = {0};
99
100 /* extract the optional directives */
101 if ((c >= 'A' && c <= 'Z') || c == '[') {
102 char *p = directives;
103 char *pend = directives + sizeof(directives) - 1;
104
105 do *p++ = av_toupper(*src++);
106 while (*src && !jss_whitespace(*src) && p < pend);
107 *p = 0;
108 src = jss_skip_whitespace(src);
109 }
110
111 /* handle directives (TODO: handle more of them, and more reliably) */
112 if (strstr(directives, "VB")) valign = ALIGN_VB;
113 else if (strstr(directives, "VM")) valign = ALIGN_VM;
114 else if (strstr(directives, "VT")) valign = ALIGN_VT;
115 if (strstr(directives, "JC")) halign = ALIGN_JC;
116 else if (strstr(directives, "JL")) halign = ALIGN_JL;
117 else if (strstr(directives, "JR")) halign = ALIGN_JR;
118 if (valign || halign) {
119 if (!valign) valign = ALIGN_VB;
120 if (!halign) halign = ALIGN_JC;
121 switch (valign | halign) {
122 case ALIGN_VB | ALIGN_JL: av_bprintf(dst, "{\\an1}"); break; // bottom left
123 case ALIGN_VB | ALIGN_JC: av_bprintf(dst, "{\\an2}"); break; // bottom center
124 case ALIGN_VB | ALIGN_JR: av_bprintf(dst, "{\\an3}"); break; // bottom right
125 case ALIGN_VM | ALIGN_JL: av_bprintf(dst, "{\\an4}"); break; // middle left
126 case ALIGN_VM | ALIGN_JC: av_bprintf(dst, "{\\an5}"); break; // middle center
127 case ALIGN_VM | ALIGN_JR: av_bprintf(dst, "{\\an6}"); break; // middle right
128 case ALIGN_VT | ALIGN_JL: av_bprintf(dst, "{\\an7}"); break; // top left
129 case ALIGN_VT | ALIGN_JC: av_bprintf(dst, "{\\an8}"); break; // top center
130 case ALIGN_VT | ALIGN_JR: av_bprintf(dst, "{\\an9}"); break; // top right
131 }
132 }
133
134 /* process timed line */
135 while (*src && *src != '\n') {
136
137 /* text continue on the next line */
138 if (src[0] == '\\' && src[1] == '\n') {
139 src += 2;
140 while (jss_whitespace(*src))
141 src++;
142 continue;
143 }
144
145 /* special character codes */
146 for (i = 0; i < FF_ARRAY_ELEMS(ass_codes_map); i++) {
147 const char *from = ass_codes_map[i].from;
148 const char *arg = ass_codes_map[i].arg;
149 size_t codemap_len = strlen(from);
150
151 if (!strncmp(src, from, codemap_len)) {
152 src += codemap_len;
153 src += ass_codes_map[i].func(dst, src, arg);
154 break;
155 }
156 }
157
158 /* simple char copy */
159 if (i == FF_ARRAY_ELEMS(ass_codes_map))
160 av_bprintf(dst, "%c", *src++);
161 }
162 }
163
jacosub_decode_frame(AVCodecContext * avctx,void * data,int * got_sub_ptr,AVPacket * avpkt)164 static int jacosub_decode_frame(AVCodecContext *avctx,
165 void *data, int *got_sub_ptr, AVPacket *avpkt)
166 {
167 int ret;
168 AVSubtitle *sub = data;
169 const char *ptr = avpkt->data;
170 FFASSDecoderContext *s = avctx->priv_data;
171
172 if (avpkt->size <= 0)
173 goto end;
174
175 if (*ptr) {
176 AVBPrint buffer;
177
178 // skip timers
179 ptr = jss_skip_whitespace(ptr);
180 ptr = strchr(ptr, ' '); if (!ptr) goto end; ptr++;
181 ptr = strchr(ptr, ' '); if (!ptr) goto end; ptr++;
182
183 av_bprint_init(&buffer, JSS_MAX_LINESIZE, JSS_MAX_LINESIZE);
184 jacosub_to_ass(avctx, &buffer, ptr);
185 ret = ff_ass_add_rect(sub, buffer.str, s->readorder++, 0, NULL, NULL);
186 av_bprint_finalize(&buffer, NULL);
187 if (ret < 0)
188 return ret;
189 }
190
191 end:
192 *got_sub_ptr = sub->num_rects > 0;
193 return avpkt->size;
194 }
195
196 AVCodec ff_jacosub_decoder = {
197 .name = "jacosub",
198 .long_name = NULL_IF_CONFIG_SMALL("JACOsub subtitle"),
199 .type = AVMEDIA_TYPE_SUBTITLE,
200 .id = AV_CODEC_ID_JACOSUB,
201 .init = ff_ass_subtitle_header_default,
202 .decode = jacosub_decode_frame,
203 .flush = ff_ass_decoder_flush,
204 .priv_data_size = sizeof(FFASSDecoderContext),
205 };
206