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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.              "ScriptType: v4.00+\r\n"
  38.              "\r\n"
  39.              "[V4+ Styles]\r\n"
  40.              "Format: Name, Fontname, Fontsize, PrimaryColour, SecondaryColour, OutlineColour, BackColour, Bold, Italic, Underline, BorderStyle, Outline, Shadow, Alignment, MarginL, MarginR, MarginV, AlphaLevel, Encoding\r\n"
  41.              "Style: Default,%s,%d,&H%x,&H%x,&H%x,&H%x,%d,%d,%d,1,1,0,%d,10,10,10,0,0\r\n"
  42.              "\r\n"
  43.              "[Events]\r\n"
  44.              "Format: Layer, Start, End, Style, Text\r\n",
  45.              font, font_size, color, color, back_color, back_color,
  46.              -bold, -italic, -underline, alignment);
  47.  
  48.     if (!avctx->subtitle_header)
  49.         return AVERROR(ENOMEM);
  50.     avctx->subtitle_header_size = strlen(avctx->subtitle_header);
  51.     return 0;
  52. }
  53.  
  54. int ff_ass_subtitle_header_default(AVCodecContext *avctx)
  55. {
  56.     return ff_ass_subtitle_header(avctx, ASS_DEFAULT_FONT,
  57.                                ASS_DEFAULT_FONT_SIZE,
  58.                                ASS_DEFAULT_COLOR,
  59.                                ASS_DEFAULT_BACK_COLOR,
  60.                                ASS_DEFAULT_BOLD,
  61.                                ASS_DEFAULT_ITALIC,
  62.                                ASS_DEFAULT_UNDERLINE,
  63.                                ASS_DEFAULT_ALIGNMENT);
  64. }
  65.  
  66. static void insert_ts(AVBPrint *buf, int ts)
  67. {
  68.     if (ts == -1) {
  69.         av_bprintf(buf, "9:59:59.99,");
  70.     } else {
  71.         int h, m, s;
  72.  
  73.         h = ts/360000;  ts -= 360000*h;
  74.         m = ts/  6000;  ts -=   6000*m;
  75.         s = ts/   100;  ts -=    100*s;
  76.         av_bprintf(buf, "%d:%02d:%02d.%02d,", h, m, s, ts);
  77.     }
  78. }
  79.  
  80. int ff_ass_add_rect(AVSubtitle *sub, const char *dialog,
  81.                     int ts_start, int duration, int raw)
  82. {
  83.     AVBPrint buf;
  84.     int ret, dlen;
  85.     AVSubtitleRect **rects;
  86.  
  87.     av_bprint_init(&buf, 0, AV_BPRINT_SIZE_UNLIMITED);
  88.     if (!raw || raw == 2) {
  89.         long int layer = 0;
  90.  
  91.         if (raw == 2) {
  92.             /* skip ReadOrder */
  93.             dialog = strchr(dialog, ',');
  94.             if (!dialog)
  95.                 return AVERROR_INVALIDDATA;
  96.             dialog++;
  97.  
  98.             /* extract Layer or Marked */
  99.             layer = strtol(dialog, (char**)&dialog, 10);
  100.             if (*dialog != ',')
  101.                 return AVERROR_INVALIDDATA;
  102.             dialog++;
  103.         }
  104.         av_bprintf(&buf, "Dialogue: %ld,", layer);
  105.         insert_ts(&buf, ts_start);
  106.         insert_ts(&buf, duration == -1 ? -1 : ts_start + duration);
  107.         if (raw != 2)
  108.             av_bprintf(&buf, "Default,");
  109.     }
  110.  
  111.     dlen = strcspn(dialog, "\n");
  112.     dlen += dialog[dlen] == '\n';
  113.  
  114.     av_bprintf(&buf, "%.*s", dlen, dialog);
  115.     if (raw == 2)
  116.         av_bprintf(&buf, "\r\n");
  117.     if (!av_bprint_is_complete(&buf))
  118.         return AVERROR(ENOMEM);
  119.  
  120.     rects = av_realloc(sub->rects, (sub->num_rects+1) * sizeof(*sub->rects));
  121.     if (!rects)
  122.         return AVERROR(ENOMEM);
  123.     sub->rects = rects;
  124.     sub->end_display_time = FFMAX(sub->end_display_time, 10 * duration);
  125.     rects[sub->num_rects]       = av_mallocz(sizeof(*rects[0]));
  126.     rects[sub->num_rects]->type = SUBTITLE_ASS;
  127.     ret = av_bprint_finalize(&buf, &rects[sub->num_rects]->ass);
  128.     if (ret < 0)
  129.         return ret;
  130.     sub->num_rects++;
  131.     return dlen;
  132. }
  133.