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  1. /*
  2.  * SSA/ASS common functions
  3.  * Copyright (c) 2010  Aurelien Jacobs <aurel@gnuage.org>
  4.  *
  5.  * This file is part of FFmpeg.
  6.  *
  7.  * FFmpeg is free software; you can redistribute it and/or
  8.  * modify it under the terms of the GNU Lesser General Public
  9.  * License as published by the Free Software Foundation; either
  10.  * version 2.1 of the License, or (at your option) any later version.
  11.  *
  12.  * FFmpeg is distributed in the hope that it will be useful,
  13.  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15.  * Lesser General Public License for more details.
  16.  *
  17.  * You should have received a copy of the GNU Lesser General Public
  18.  * License along with FFmpeg; if not, write to the Free Software
  19.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  20.  */
  21.  
  22. #include "avcodec.h"
  23. #include "ass.h"
  24. #include "libavutil/avassert.h"
  25. #include "libavutil/avstring.h"
  26. #include "libavutil/bprint.h"
  27. #include "libavutil/common.h"
  28.  
  29. int ff_ass_subtitle_header(AVCodecContext *avctx,
  30.                            const char *font, int font_size,
  31.                            int color, int back_color,
  32.                            int bold, int italic, int underline,
  33.                            int alignment)
  34. {
  35.     avctx->subtitle_header = av_asprintf(
  36.              "[Script Info]\r\n"
  37.              "; Script generated by FFmpeg/Lavc%s\r\n"
  38.              "ScriptType: v4.00+\r\n"
  39.              "PlayResX: %d\r\n"
  40.              "PlayResY: %d\r\n"
  41.              "\r\n"
  42.              "[V4+ Styles]\r\n"
  43.  
  44.              /* ASSv4 header */
  45.              "Format: Name, "
  46.              "Fontname, Fontsize, "
  47.              "PrimaryColour, SecondaryColour, OutlineColour, BackColour, "
  48.              "Bold, Italic, Underline, StrikeOut, "
  49.              "ScaleX, ScaleY, "
  50.              "Spacing, Angle, "
  51.              "BorderStyle, Outline, Shadow, "
  52.              "Alignment, MarginL, MarginR, MarginV, "
  53.              "Encoding\r\n"
  54.  
  55.              "Style: "
  56.              "Default,"             /* Name */
  57.              "%s,%d,"               /* Font{name,size} */
  58.              "&H%x,&H%x,&H%x,&H%x," /* {Primary,Secondary,Outline,Back}Colour */
  59.              "%d,%d,%d,0,"          /* Bold, Italic, Underline, StrikeOut */
  60.              "100,100,"             /* Scale{X,Y} */
  61.              "0,0,"                 /* Spacing, Angle */
  62.              "1,1,0,"               /* BorderStyle, Outline, Shadow */
  63.              "%d,10,10,10,"         /* Alignment, Margin[LRV] */
  64.              "0\r\n"                /* Encoding */
  65.  
  66.              "\r\n"
  67.              "[Events]\r\n"
  68.              "Format: Layer, Start, End, Style, Name, MarginL, MarginR, MarginV, Effect, Text\r\n",
  69.              !(avctx->flags & AV_CODEC_FLAG_BITEXACT) ? AV_STRINGIFY(LIBAVCODEC_VERSION) : "",
  70.              ASS_DEFAULT_PLAYRESX, ASS_DEFAULT_PLAYRESY,
  71.              font, font_size, color, color, back_color, back_color,
  72.              -bold, -italic, -underline, alignment);
  73.  
  74.     if (!avctx->subtitle_header)
  75.         return AVERROR(ENOMEM);
  76.     avctx->subtitle_header_size = strlen(avctx->subtitle_header);
  77.     return 0;
  78. }
  79.  
  80. int ff_ass_subtitle_header_default(AVCodecContext *avctx)
  81. {
  82.     return ff_ass_subtitle_header(avctx, ASS_DEFAULT_FONT,
  83.                                ASS_DEFAULT_FONT_SIZE,
  84.                                ASS_DEFAULT_COLOR,
  85.                                ASS_DEFAULT_BACK_COLOR,
  86.                                ASS_DEFAULT_BOLD,
  87.                                ASS_DEFAULT_ITALIC,
  88.                                ASS_DEFAULT_UNDERLINE,
  89.                                ASS_DEFAULT_ALIGNMENT);
  90. }
  91.  
  92. static void insert_ts(AVBPrint *buf, int ts)
  93. {
  94.     if (ts == -1) {
  95.         av_bprintf(buf, "9:59:59.99,");
  96.     } else {
  97.         int h, m, s;
  98.  
  99.         h = ts/360000;  ts -= 360000*h;
  100.         m = ts/  6000;  ts -=   6000*m;
  101.         s = ts/   100;  ts -=    100*s;
  102.         av_bprintf(buf, "%d:%02d:%02d.%02d,", h, m, s, ts);
  103.     }
  104. }
  105.  
  106. int ff_ass_bprint_dialog(AVBPrint *buf, const char *dialog,
  107.                          int ts_start, int duration, int raw)
  108. {
  109.     int dlen;
  110.  
  111.     if (!raw || raw == 2) {
  112.         long int layer = 0;
  113.  
  114.         if (raw == 2) {
  115.             /* skip ReadOrder */
  116.             dialog = strchr(dialog, ',');
  117.             if (!dialog)
  118.                 return AVERROR_INVALIDDATA;
  119.             dialog++;
  120.  
  121.             /* extract Layer or Marked */
  122.             layer = strtol(dialog, (char**)&dialog, 10);
  123.             if (*dialog != ',')
  124.                 return AVERROR_INVALIDDATA;
  125.             dialog++;
  126.         }
  127.         av_bprintf(buf, "Dialogue: %ld,", layer);
  128.         insert_ts(buf, ts_start);
  129.         insert_ts(buf, duration == -1 ? -1 : ts_start + duration);
  130.         if (raw != 2)
  131.             av_bprintf(buf, "Default,,0,0,0,,");
  132.     }
  133.  
  134.     dlen = strcspn(dialog, "\n");
  135.     dlen += dialog[dlen] == '\n';
  136.  
  137.     av_bprintf(buf, "%.*s", dlen, dialog);
  138.     if (raw == 2)
  139.         av_bprintf(buf, "\r\n");
  140.  
  141.     return dlen;
  142. }
  143.  
  144. int ff_ass_add_rect(AVSubtitle *sub, const char *dialog,
  145.                     int ts_start, int duration, int raw)
  146. {
  147.     AVBPrint buf;
  148.     int ret, dlen;
  149.     AVSubtitleRect **rects;
  150.  
  151.     av_bprint_init(&buf, 0, AV_BPRINT_SIZE_UNLIMITED);
  152.     if ((ret = ff_ass_bprint_dialog(&buf, dialog, ts_start, duration, raw)) < 0)
  153.         goto err;
  154.     dlen = ret;
  155.     if (!av_bprint_is_complete(&buf))
  156.         goto errnomem;
  157.  
  158.     rects = av_realloc_array(sub->rects, (sub->num_rects+1), sizeof(*sub->rects));
  159.     if (!rects)
  160.         goto errnomem;
  161.     sub->rects = rects;
  162.     sub->end_display_time = FFMAX(sub->end_display_time, 10 * duration);
  163.     rects[sub->num_rects]       = av_mallocz(sizeof(*rects[0]));
  164.     rects[sub->num_rects]->type = SUBTITLE_ASS;
  165.     ret = av_bprint_finalize(&buf, &rects[sub->num_rects]->ass);
  166.     if (ret < 0)
  167.         goto err;
  168.     sub->num_rects++;
  169.     return dlen;
  170.  
  171. errnomem:
  172.     ret = AVERROR(ENOMEM);
  173. err:
  174.     av_bprint_finalize(&buf, NULL);
  175.     return ret;
  176. }
  177.  
  178. int ff_ass_add_rect_bprint(AVSubtitle *sub, AVBPrint *buf,
  179.                            int ts_start, int duration)
  180. {
  181.     av_bprintf(buf, "\r\n");
  182.     if (!av_bprint_is_complete(buf))
  183.         return AVERROR(ENOMEM);
  184.     return ff_ass_add_rect(sub, buf->str, ts_start, duration, 0);
  185. }
  186.  
  187. void ff_ass_bprint_text_event(AVBPrint *buf, const char *p, int size,
  188.                              const char *linebreaks, int keep_ass_markup)
  189. {
  190.     const char *p_end = p + size;
  191.  
  192.     for (; p < p_end && *p; p++) {
  193.  
  194.         /* forced custom line breaks, not accounted as "normal" EOL */
  195.         if (linebreaks && strchr(linebreaks, *p)) {
  196.             av_bprintf(buf, "\\N");
  197.  
  198.         /* standard ASS escaping so random characters don't get mis-interpreted
  199.          * as ASS */
  200.         } else if (!keep_ass_markup && strchr("{}\\", *p)) {
  201.             av_bprintf(buf, "\\%c", *p);
  202.  
  203.         /* some packets might end abruptly (no \0 at the end, like for example
  204.          * in some cases of demuxing from a classic video container), some
  205.          * might be terminated with \n or \r\n which we have to remove (for
  206.          * consistency with those who haven't), and we also have to deal with
  207.          * evil cases such as \r at the end of the buffer (and no \0 terminated
  208.          * character) */
  209.         } else if (p[0] == '\n') {
  210.             /* some stuff left so we can insert a line break */
  211.             if (p < p_end - 1)
  212.                 av_bprintf(buf, "\\N");
  213.         } else if (p[0] == '\r' && p < p_end - 1 && p[1] == '\n') {
  214.             /* \r followed by a \n, we can skip it. We don't insert the \N yet
  215.              * because we don't know if it is followed by more text */
  216.             continue;
  217.  
  218.         /* finally, a sane character */
  219.         } else {
  220.             av_bprint_chars(buf, *p, 1);
  221.         }
  222.     }
  223. }
  224.