ass_mp.c

   1 /*
   2  * Copyright (C) 2006 Evgeniy Stepanov <eugeni.stepanov@gmail.com>
   3  *
   4  * This file is part of MPlayer.
   5  *
   6  * MPlayer is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * MPlayer 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
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License along
  17  * with libass; if not, write to the Free Software Foundation, Inc.,
  18  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  19  */
  20
  21 #include <inttypes.h>
  22 #include <string.h>
  23 #include <stdlib.h>
  24 #include <stdarg.h>
  25
  26 #include <ass/ass.h>
  27 #include <ass/ass_types.h>
  28
  29 #include "mp_msg.h"
  30 #include "get_path.h"
  31 #include "ass_mp.h"
  32 #include "subreader.h"
  33
  34 #ifdef CONFIG_FONTCONFIG
  35 #include <fontconfig/fontconfig.h>
  36 #endif
  37
  38 // libass-related command line options
  39 ASS_Library *ass_library;
  40 float ass_font_scale = 1.;
  41 float ass_line_spacing = 0.;
  42 int ass_top_margin = 0;
  43 int ass_bottom_margin = 0;
  44 int use_embedded_fonts = 1;
  45 char **ass_force_style_list = NULL;
  46 int ass_use_margins = 0;
  47 char *ass_color = NULL;
  48 char *ass_border_color = NULL;
  49 char *ass_styles_file = NULL;
  50 int ass_hinting = ASS_HINTING_LIGHT + 4;       // light hinting for unscaled osd
  51
  52 #ifdef CONFIG_FONTCONFIG
  53 extern int font_fontconfig;
  54 #else
  55 static int font_fontconfig = -1;
  56 #endif
  57 extern char *font_name;
  58 extern char *sub_font_name;
  59 extern float text_font_scale_factor;
  60 extern int subtitle_autoscale;
  61
  62 #ifdef CONFIG_ICONV
  63 extern char *sub_cp;
  64 #else
  65 static char *sub_cp = 0;
  66 #endif
  67
  68 void process_force_style(ASS_Track *track);
  69
  70 ASS_Track *ass_default_track(ASS_Library *library)
  71 {
  72     ASS_Track *track = ass_new_track(library);
  73
  74     track->track_type = TRACK_TYPE_ASS;
  75     track->Timer = 100.;
  76     track->PlayResY = 288;
  77     track->WrapStyle = 0;
  78
  79     if (ass_styles_file)
  80         ass_read_styles(track, ass_styles_file, sub_cp);
  81
  82     if (track->n_styles == 0) {
  83         ASS_Style *style;
  84         int sid;
  85         double fs;
  86         uint32_t c1, c2;
  87
  88         sid = ass_alloc_style(track);
  89         style = track->styles + sid;
  90         style->Name = strdup("Default");
  91         style->FontName = (font_fontconfig >= 0
  92                            && sub_font_name) ? strdup(sub_font_name)
  93             : (font_fontconfig >= 0
  94                && font_name) ? strdup(font_name) : strdup("Sans");
  95         style->treat_fontname_as_pattern = 1;
  96
  97         fs = track->PlayResY * text_font_scale_factor / 100.;
  98         // approximate autoscale coefficients
  99         if (subtitle_autoscale == 2)
 100             fs *= 1.3;
 101         else if (subtitle_autoscale == 3)
 102             fs *= 1.4;
 103         style->FontSize = fs;
 104
 105         if (ass_color)
 106             c1 = strtoll(ass_color, NULL, 16);
 107         else
 108             c1 = 0xFFFF0000;
 109         if (ass_border_color)
 110             c2 = strtoll(ass_border_color, NULL, 16);
 111         else
 112             c2 = 0x00000000;
 113
 114         style->PrimaryColour = c1;
 115         style->SecondaryColour = c1;
 116         style->OutlineColour = c2;
 117         style->BackColour = 0x00000000;
 118         style->BorderStyle = 1;
 119         style->Alignment = 2;
 120         style->Outline = 2;
 121         style->MarginL = 10;
 122         style->MarginR = 10;
 123         style->MarginV = 5;
 124         style->ScaleX = 1.;
 125         style->ScaleY = 1.;
 126     }
 127
 128     ass_process_force_style(track);
 129     return track;
 130 }
 131
 132 static int check_duplicate_plaintext_event(ASS_Track *track)
 133 {
 134     int i;
 135     ASS_Event *evt = track->events + track->n_events - 1;
 136
 137     for (i = 0; i < track->n_events - 1; ++i)   // ignoring last event, it is the one we are comparing with
 138         if (track->events[i].Start == evt->Start &&
 139             track->events[i].Duration == evt->Duration &&
 140             strcmp(track->events[i].Text, evt->Text) == 0)
 141             return 1;
 142     return 0;
 143 }
 144
 145 /**
 146  * \brief Convert subtitle to ASS_Events for the given track
 147  * \param track track
 148  * \param sub subtitle to convert
 149  * \return event id
 150  * note: assumes that subtitle is _not_ fps-based; caller must manually correct
 151  *   Start and Duration in other case.
 152  **/
 153 int ass_process_subtitle(ASS_Track *track, subtitle *sub)
 154 {
 155     int eid;
 156     ASS_Event *event;
 157     int len = 0, j;
 158     char *p;
 159     char *end;
 160
 161     eid = ass_alloc_event(track);
 162     event = track->events + eid;
 163
 164     event->Start = sub->start * 10;
 165     event->Duration = (sub->end - sub->start) * 10;
 166     event->Style = 0;
 167
 168     for (j = 0; j < sub->lines; ++j)
 169         len += sub->text[j] ? strlen(sub->text[j]) : 0;
 170
 171     len += 2 * sub->lines;      // '\N', including the one after the last line
 172     len += 6;                   // {\anX}
 173     len += 1;                   // '\0'
 174
 175     event->Text = malloc(len);
 176     end = event->Text + len;
 177     p = event->Text;
 178
 179     if (sub->alignment)
 180         p += snprintf(p, end - p, "{\\an%d}", sub->alignment);
 181
 182     for (j = 0; j < sub->lines; ++j)
 183         p += snprintf(p, end - p, "%s\\N", sub->text[j]);
 184
 185     if (sub->lines > 0)
 186         p -= 2;                 // remove last "\N"
 187     *p = 0;
 188
 189     if (check_duplicate_plaintext_event(track)) {
 190         ass_free_event(track, eid);
 191         track->n_events--;
 192         return -1;
 193     }
 194
 195     mp_msg(MSGT_ASS, MSGL_V,
 196            "plaintext event at %" PRId64 ", +%" PRId64 ": %s  \n",
 197            (int64_t) event->Start, (int64_t) event->Duration, event->Text);
 198
 199     return eid;
 200 }
 201
 202
 203 /**
 204  * \brief Convert subdata to ASS_Track
 205  * \param subdata subtitles struct from subreader
 206  * \param fps video framerate
 207  * \return newly allocated ASS_Track, filled with subtitles from subdata
 208  */
 209 ASS_Track *ass_read_subdata(ASS_Library *library, sub_data *subdata,
 210                             double fps)
 211 {
 212     ASS_Track *track;
 213     int i;
 214
 215     track = ass_default_track(library);
 216     track->name = subdata->filename ? strdup(subdata->filename) : 0;
 217
 218     for (i = 0; i < subdata->sub_num; ++i) {
 219         int eid = ass_process_subtitle(track, subdata->subtitles + i);
 220         if (eid < 0)
 221             continue;
 222         if (!subdata->sub_uses_time) {
 223             track->events[eid].Start *= 100. / fps;
 224             track->events[eid].Duration *= 100. / fps;
 225         }
 226     }
 227     return track;
 228 }
 229
 230 void ass_configure(ASS_Renderer *priv, int w, int h, int unscaled)
 231 {
 232     int hinting;
 233     ass_set_frame_size(priv, w, h);
 234     ass_set_margins(priv, ass_top_margin, ass_bottom_margin, 0, 0);
 235     ass_set_use_margins(priv, ass_use_margins);
 236     ass_set_font_scale(priv, ass_font_scale);
 237     if (!unscaled && (ass_hinting & 4))
 238         hinting = 0;
 239     else
 240         hinting = ass_hinting & 3;
 241     ass_set_hinting(priv, hinting);
 242     ass_set_line_spacing(priv, ass_line_spacing);
 243 }
 244
 245 void ass_configure_fonts(ASS_Renderer *priv)
 246 {
 247     char *dir, *path, *family;
 248     dir = get_path("fonts");
 249     if (font_fontconfig < 0 && sub_font_name)
 250         path = strdup(sub_font_name);
 251     else if (font_fontconfig < 0 && font_name)
 252         path = strdup(font_name);
 253     else
 254         path = get_path("subfont.ttf");
 255     if (font_fontconfig >= 0 && sub_font_name)
 256         family = strdup(sub_font_name);
 257     else if (font_fontconfig >= 0 && font_name)
 258         family = strdup(font_name);
 259     else
 260         family = 0;
 261
 262     ass_set_fonts(priv, path, family, font_fontconfig + 1, NULL, 1);
 263
 264     free(dir);
 265     free(path);
 266     free(family);
 267 }
 268
 269 static void message_callback(int level, const char *format, va_list va, void *ctx)
 270 {
 271     mp_msg(MSGT_ASS, level, "[ass] ");
 272     mp_msg_va(MSGT_ASS, level, format, va);
 273     // libass messages lack trailing \n
 274     mp_msg(MSGT_ASS, level, "\n");
 275 }
 276
 277 ASS_Library *ass_init(void)
 278 {
 279     ASS_Library *priv;
 280     char *path = get_path("fonts");
 281     priv = ass_library_init();
 282     ass_set_message_cb(priv, message_callback, NULL);
 283     ass_set_fonts_dir(priv, path);
 284     ass_set_extract_fonts(priv, use_embedded_fonts);
 285     ass_set_style_overrides(priv, ass_force_style_list);
 286     free(path);
 287     return priv;
 288 }
 289
 290 int ass_force_reload = 0;       // flag set if global ass-related settings were changed
 291
 292 ASS_Image *ass_mp_render_frame(ASS_Renderer *priv, ASS_Track *track,
 293                                long long now, int *detect_change)
 294 {
 295     if (ass_force_reload) {
 296         ass_set_margins(priv, ass_top_margin, ass_bottom_margin, 0, 0);
 297         ass_set_use_margins(priv, ass_use_margins);
 298         ass_set_font_scale(priv, ass_font_scale);
 299         ass_force_reload = 0;
 300     }
 301     return ass_render_frame(priv, track, now, detect_change);
 302 }