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jacosubdec.c
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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"
33 
34 #undef time
35 
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 
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, &ltime);
49  strftime(buf, sizeof(buf), arg, &ltime);
50  av_bprintf(dst, "%s", buf);
51  return 0;
52 }
53 
54 static int insert_color(AVBPrint *dst, const char *in, const char *arg)
55 {
56  return 1; // skip id
57 }
58 
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 
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 
165  void *data, int *got_sub_ptr, AVPacket *avpkt)
166 {
167  int ret;
168  AVSubtitle *sub = data;
169  const char *ptr = avpkt->data;
170 
171  if (avpkt->size <= 0)
172  goto end;
173 
174  if (*ptr) {
176 
177  // skip timers
178  ptr = jss_skip_whitespace(ptr);
179  ptr = strchr(ptr, ' '); if (!ptr) goto end; ptr++;
180  ptr = strchr(ptr, ' '); if (!ptr) goto end; ptr++;
181 
183  jacosub_to_ass(avctx, &buffer, ptr);
184  ret = ff_ass_add_rect_bprint(sub, &buffer, avpkt->pts, avpkt->duration);
185  av_bprint_finalize(&buffer, NULL);
186  if (ret < 0)
187  return ret;
188  }
189 
190 end:
191  *got_sub_ptr = sub->num_rects > 0;
192  return avpkt->size;
193 }
194 
196  .name = "jacosub",
197  .long_name = NULL_IF_CONFIG_SMALL("JACOsub subtitle"),
198  .type = AVMEDIA_TYPE_SUBTITLE,
199  .id = AV_CODEC_ID_JACOSUB,
201  .decode = jacosub_decode_frame,
202 };