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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"
  32.  
  33. #undef time
  34.  
  35. static int insert_text(AVBPrint *dst, const char *in, const char *arg)
  36. {
  37.     av_bprintf(dst, "%s", arg);
  38.     return 0;
  39. }
  40.  
  41. static int insert_datetime(AVBPrint *dst, const char *in, const char *arg)
  42. {
  43.     char buf[16] = {0};
  44.     time_t now = time(0);
  45.     struct tm ltime;
  46.  
  47. #if HAVE_LOCALTIME_R
  48.     localtime_r(&now, &ltime);
  49. #else
  50.     ltime = *localtime(&now);
  51. #endif
  52.     strftime(buf, sizeof(buf), arg, &ltime);
  53.     av_bprintf(dst, "%s", buf);
  54.     return 0;
  55. }
  56.  
  57. static int insert_color(AVBPrint *dst, const char *in, const char *arg)
  58. {
  59.     return 1; // skip id
  60. }
  61.  
  62. static int insert_font(AVBPrint *dst, const char *in, const char *arg)
  63. {
  64.     return 1; // skip id
  65. }
  66.  
  67. static const struct {
  68.     const char *from;
  69.     const char *arg;
  70.     int (*func)(AVBPrint *dst, const char *in, const char *arg);
  71. } ass_codes_map[] = {
  72.     {"\\~", "~",        insert_text},       // tilde doesn't need escaping
  73.     {"~",   "{\\h}",    insert_text},       // hard space
  74.     {"\\n", "\\N",      insert_text},       // newline
  75.     {"\\D", "%d %b %Y", insert_datetime},   // current date
  76.     {"\\T", "%H:%M",    insert_datetime},   // current time
  77.     {"\\N", "{\\r}",    insert_text},       // reset to default style
  78.     {"\\I", "{\\i1}",   insert_text},       // italic on
  79.     {"\\i", "{\\i0}",   insert_text},       // italic off
  80.     {"\\B", "{\\b1}",   insert_text},       // bold on
  81.     {"\\b", "{\\b0}",   insert_text},       // bold off
  82.     {"\\U", "{\\u1}",   insert_text},       // underline on
  83.     {"\\u", "{\\u0}",   insert_text},       // underline off
  84.     {"\\C", "",         insert_color},      // TODO: color
  85.     {"\\F", "",         insert_font},       // TODO: font
  86. };
  87.  
  88. enum {
  89.     ALIGN_VB = 1<<0, // vertical bottom, default
  90.     ALIGN_VM = 1<<1, // vertical middle
  91.     ALIGN_VT = 1<<2, // vertical top
  92.     ALIGN_JC = 1<<3, // justify center, default
  93.     ALIGN_JL = 1<<4, // justify left
  94.     ALIGN_JR = 1<<5, // justify right
  95. };
  96.  
  97. static void jacosub_to_ass(AVCodecContext *avctx, AVBPrint *dst, const char *src)
  98. {
  99.     int i, valign = 0, halign = 0;
  100.     char c = av_toupper(*src);
  101.     char directives[128] = {0};
  102.  
  103.     /* extract the optional directives */
  104.     if ((c >= 'A' && c <= 'Z') || c == '[') {
  105.         char *p    = directives;
  106.         char *pend = directives + sizeof(directives) - 1;
  107.  
  108.         do *p++ = av_toupper(*src++);
  109.         while (*src && !jss_whitespace(*src) && p < pend);
  110.         *p = 0;
  111.         src = jss_skip_whitespace(src);
  112.     }
  113.  
  114.     /* handle directives (TODO: handle more of them, and more reliably) */
  115.     if      (strstr(directives, "VB")) valign = ALIGN_VB;
  116.     else if (strstr(directives, "VM")) valign = ALIGN_VM;
  117.     else if (strstr(directives, "VT")) valign = ALIGN_VT;
  118.     if      (strstr(directives, "JC")) halign = ALIGN_JC;
  119.     else if (strstr(directives, "JL")) halign = ALIGN_JL;
  120.     else if (strstr(directives, "JR")) halign = ALIGN_JR;
  121.     if (valign || halign) {
  122.         if (!valign) valign = ALIGN_VB;
  123.         if (!halign) halign = ALIGN_JC;
  124.         switch (valign | halign) {
  125.         case ALIGN_VB | ALIGN_JL: av_bprintf(dst, "{\\an1}"); break; // bottom left
  126.         case ALIGN_VB | ALIGN_JC: av_bprintf(dst, "{\\an2}"); break; // bottom center
  127.         case ALIGN_VB | ALIGN_JR: av_bprintf(dst, "{\\an3}"); break; // bottom right
  128.         case ALIGN_VM | ALIGN_JL: av_bprintf(dst, "{\\an4}"); break; // middle left
  129.         case ALIGN_VM | ALIGN_JC: av_bprintf(dst, "{\\an5}"); break; // middle center
  130.         case ALIGN_VM | ALIGN_JR: av_bprintf(dst, "{\\an6}"); break; // middle right
  131.         case ALIGN_VT | ALIGN_JL: av_bprintf(dst, "{\\an7}"); break; // top left
  132.         case ALIGN_VT | ALIGN_JC: av_bprintf(dst, "{\\an8}"); break; // top center
  133.         case ALIGN_VT | ALIGN_JR: av_bprintf(dst, "{\\an9}"); break; // top right
  134.         }
  135.     }
  136.  
  137.     /* process timed line */
  138.     while (*src && *src != '\n') {
  139.  
  140.         /* text continue on the next line */
  141.         if (src[0] == '\\' && src[1] == '\n') {
  142.             src += 2;
  143.             while (jss_whitespace(*src))
  144.                 src++;
  145.             continue;
  146.         }
  147.  
  148.         /* special character codes */
  149.         for (i = 0; i < FF_ARRAY_ELEMS(ass_codes_map); i++) {
  150.             const char *from = ass_codes_map[i].from;
  151.             const char *arg  = ass_codes_map[i].arg;
  152.             size_t codemap_len = strlen(from);
  153.  
  154.             if (!strncmp(src, from, codemap_len)) {
  155.                 src += codemap_len;
  156.                 src += ass_codes_map[i].func(dst, src, arg);
  157.                 break;
  158.             }
  159.         }
  160.  
  161.         /* simple char copy */
  162.         if (i == FF_ARRAY_ELEMS(ass_codes_map))
  163.             av_bprintf(dst, "%c", *src++);
  164.     }
  165.     av_bprintf(dst, "\r\n");
  166. }
  167.  
  168. static int jacosub_decode_frame(AVCodecContext *avctx,
  169.                                 void *data, int *got_sub_ptr, AVPacket *avpkt)
  170. {
  171.     AVSubtitle *sub = data;
  172.     const char *ptr = avpkt->data;
  173.  
  174.     if (avpkt->size <= 0)
  175.         goto end;
  176.  
  177.     if (*ptr) {
  178.         AVBPrint buffer;
  179.         char *dec_sub;
  180.  
  181.         // skip timers
  182.         ptr = jss_skip_whitespace(ptr);
  183.         ptr = strchr(ptr, ' '); if (!ptr) goto end; ptr++;
  184.         ptr = strchr(ptr, ' '); if (!ptr) goto end; ptr++;
  185.  
  186.         av_bprint_init(&buffer, JSS_MAX_LINESIZE, JSS_MAX_LINESIZE);
  187.         jacosub_to_ass(avctx, &buffer, ptr);
  188.         av_bprint_finalize(&buffer, &dec_sub);
  189.         ff_ass_add_rect(sub, dec_sub, avpkt->pts, avpkt->duration, 0);
  190.         av_free(dec_sub);
  191.     }
  192.  
  193. end:
  194.     *got_sub_ptr = sub->num_rects > 0;
  195.     return avpkt->size;
  196. }
  197.  
  198. AVCodec ff_jacosub_decoder = {
  199.     .name           = "jacosub",
  200.     .long_name      = NULL_IF_CONFIG_SMALL("JACOsub subtitle"),
  201.     .type           = AVMEDIA_TYPE_SUBTITLE,
  202.     .id             = AV_CODEC_ID_JACOSUB,
  203.     .init           = ff_ass_subtitle_header_default,
  204.     .decode         = jacosub_decode_frame,
  205. };
  206.