sub/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 #include <stdbool.h>
  26
  27 #include <ass/ass.h>
  28 #include <ass/ass_types.h>
  29
  30 #include <libavutil/common.h>
  31
  32 #include "config.h"
  33 #include "mp_msg.h"
  34 #include "path.h"
  35 #include "ass_mp.h"
  36 #include "subreader.h"
  37 #include "stream/stream.h"
  38
  39 #ifdef CONFIG_FONTCONFIG
  40 #include <fontconfig/fontconfig.h>
  41 #endif
  42
  43 // libass-related command line options
  44 ASS_Library *ass_library;
  45 float ass_font_scale = 1.;
  46 float ass_line_spacing = 0.;
  47 int ass_top_margin = 0;
  48 int ass_bottom_margin = 0;
  49 int use_embedded_fonts = 1;
  50 char **ass_force_style_list = NULL;
  51 int ass_use_margins = 0;
  52 char *ass_color = NULL;
  53 char *ass_border_color = NULL;
  54 char *ass_styles_file = NULL;
  55 int ass_hinting = ASS_HINTING_LIGHT + 4;       // light hinting for unscaled osd
  56
  57 #ifdef CONFIG_FONTCONFIG
  58 extern int font_fontconfig;
  59 #else
  60 static int font_fontconfig = -1;
  61 #endif
  62 extern char *font_name;
  63 extern char *sub_font_name;
  64 extern float text_font_scale_factor;
  65 extern int subtitle_autoscale;
  66
  67 #ifdef CONFIG_ICONV
  68 extern char *sub_cp;
  69 #else
  70 static char *sub_cp = 0;
  71 #endif
  72
  73 ASS_Track *mp_ass_default_track(ASS_Library *library)
  74 {
  75     ASS_Track *track = ass_new_track(library);
  76
  77     track->track_type = TRACK_TYPE_ASS;
  78     track->Timer = 100.;
  79     track->PlayResY = 288;
  80     track->WrapStyle = 0;
  81
  82     if (ass_styles_file)
  83         ass_read_styles(track, ass_styles_file, sub_cp);
  84
  85     if (track->n_styles == 0) {
  86         track->Kerning = true;
  87         int sid = ass_alloc_style(track);
  88         track->default_style = sid;
  89         ASS_Style *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         double fs = track->PlayResY * text_font_scale_factor / 100.;
  98         /* The font size is always proportional to video height only;
  99          * real -subfont-autoscale behavior is not implemented.
 100          * Apply a correction that corresponds to about 4:3 aspect ratio
 101          * video to get a size somewhat closer to what non-libass rendering
 102          * would produce with the same text_font_scale_factor
 103          * and subtitle_autoscale.
 104          */
 105         if (subtitle_autoscale == 2)
 106             fs *= 1.3;
 107         else if (subtitle_autoscale == 3)
 108             fs *= 1.7;
 109
 110         uint32_t c1 = 0xFFFFFF00;
 111         uint32_t c2 = 0x00000000;
 112         if (ass_color)
 113             c1 = strtoll(ass_color, NULL, 16);
 114         if (ass_border_color)
 115             c2 = strtoll(ass_border_color, NULL, 16);
 116
 117         style->FontSize = fs;
 118         style->PrimaryColour = c1;
 119         style->SecondaryColour = c1;
 120         style->OutlineColour = c2;
 121         style->BackColour = 0x00000000;
 122         style->BorderStyle = 1;
 123         style->Alignment = 2;
 124         style->Outline = fs / 16;
 125         style->MarginL = 10;
 126         style->MarginR = 10;
 127         style->MarginV = 5;
 128         style->ScaleX = 1.;
 129         style->ScaleY = 1.;
 130     }
 131
 132     ass_process_force_style(track);
 133     return track;
 134 }
 135
 136 static int check_duplicate_plaintext_event(ASS_Track *track)
 137 {
 138     int i;
 139     ASS_Event *evt = track->events + track->n_events - 1;
 140
 141     for (i = 0; i < track->n_events - 1; ++i)   // ignoring last event, it is the one we are comparing with
 142         if (track->events[i].Start == evt->Start &&
 143             track->events[i].Duration == evt->Duration &&
 144             strcmp(track->events[i].Text, evt->Text) == 0)
 145             return 1;
 146     return 0;
 147 }
 148
 149 /**
 150  * \brief Convert subtitle to ASS_Events for the given track
 151  * \param track track
 152  * \param sub subtitle to convert
 153  * \return event id
 154  * note: assumes that subtitle is _not_ fps-based; caller must manually correct
 155  *   Start and Duration in other case.
 156  **/
 157 static int ass_process_subtitle(ASS_Track *track, subtitle *sub)
 158 {
 159     int eid;
 160     ASS_Event *event;
 161     int len = 0, j;
 162     char *p;
 163     char *end;
 164
 165     eid = ass_alloc_event(track);
 166     event = track->events + eid;
 167
 168     event->Start = sub->start * 10;
 169     event->Duration = (sub->end - sub->start) * 10;
 170     event->Style = track->default_style;
 171
 172     for (j = 0; j < sub->lines; ++j)
 173         len += sub->text[j] ? strlen(sub->text[j]) : 0;
 174
 175     len += 2 * sub->lines;      // '\N', including the one after the last line
 176     len += 6;                   // {\anX}
 177     len += 1;                   // '\0'
 178
 179     event->Text = malloc(len);
 180     end = event->Text + len;
 181     p = event->Text;
 182
 183     if (sub->alignment)
 184         p += snprintf(p, end - p, "{\\an%d}", sub->alignment);
 185
 186     for (j = 0; j < sub->lines; ++j)
 187         p += snprintf(p, end - p, "%s\\N", sub->text[j]);
 188
 189     if (sub->lines > 0)
 190         p -= 2;                 // remove last "\N"
 191     *p = 0;
 192
 193     if (check_duplicate_plaintext_event(track)) {
 194         ass_free_event(track, eid);
 195         track->n_events--;
 196         return -1;
 197     }
 198
 199     mp_msg(MSGT_ASS, MSGL_V,
 200            "plaintext event at %" PRId64 ", +%" PRId64 ": %s  \n",
 201            (int64_t) event->Start, (int64_t) event->Duration, event->Text);
 202
 203     return eid;
 204 }
 205
 206
 207 /**
 208  * \brief Convert subdata to ASS_Track
 209  * \param subdata subtitles struct from subreader
 210  * \param fps video framerate
 211  * \return newly allocated ASS_Track, filled with subtitles from subdata
 212  */
 213 ASS_Track *mp_ass_read_subdata(ASS_Library *library, sub_data *subdata,
 214                                double fps)
 215 {
 216     ASS_Track *track;
 217     int i;
 218
 219     track = mp_ass_default_track(library);
 220     track->name = subdata->filename ? strdup(subdata->filename) : 0;
 221
 222     for (i = 0; i < subdata->sub_num; ++i) {
 223         int eid = ass_process_subtitle(track, subdata->subtitles + i);
 224         if (eid < 0)
 225             continue;
 226         if (!subdata->sub_uses_time) {
 227             track->events[eid].Start *= 100. / fps;
 228             track->events[eid].Duration *= 100. / fps;
 229         }
 230     }
 231     return track;
 232 }
 233
 234 ASS_Track *mp_ass_read_stream(ASS_Library *library, const char *fname,
 235                               char *charset)
 236 {
 237     ASS_Track *track;
 238
 239     struct stream *s = open_stream(fname, NULL, NULL);
 240     if (!s)
 241         // Stream code should have printed an error already
 242         return NULL;
 243     struct bstr content = stream_read_complete(s, NULL, 100000000, 1);
 244     if (content.start == NULL)
 245         mp_tmsg(MSGT_ASS, MSGL_ERR, "Refusing to load subtitle file "
 246                 "larger than 100 MB: %s\n", fname);
 247     free_stream(s);
 248     if (content.len == 0) {
 249         talloc_free(content.start);
 250         return NULL;
 251     }
 252     content.start[content.len] = 0;
 253     track = ass_read_memory(library, content.start, content.len, charset);
 254     if (track) {
 255         free(track->name);
 256         track->name = strdup(fname);
 257     }
 258     talloc_free(content.start);
 259     return track;
 260 }
 261
 262 void mp_ass_configure(ASS_Renderer *priv, int w, int h, bool unscaled)
 263 {
 264     int hinting;
 265     ass_set_frame_size(priv, w, h);
 266     ass_set_margins(priv, ass_top_margin, ass_bottom_margin, 0, 0);
 267     ass_set_use_margins(priv, ass_use_margins);
 268     ass_set_font_scale(priv, ass_font_scale);
 269     if (!unscaled && (ass_hinting & 4))
 270         hinting = 0;
 271     else
 272         hinting = ass_hinting & 3;
 273     ass_set_hinting(priv, hinting);
 274     ass_set_line_spacing(priv, ass_line_spacing);
 275 }
 276
 277 void mp_ass_configure_fonts(ASS_Renderer *priv)
 278 {
 279     char *dir, *path, *family;
 280     dir = get_path("fonts");
 281     if (font_fontconfig < 0 && sub_font_name)
 282         path = strdup(sub_font_name);
 283     else if (font_fontconfig < 0 && font_name)
 284         path = strdup(font_name);
 285     else
 286         path = get_path("subfont.ttf");
 287     if (font_fontconfig >= 0 && sub_font_name)
 288         family = strdup(sub_font_name);
 289     else if (font_fontconfig >= 0 && font_name)
 290         family = strdup(font_name);
 291     else
 292         family = 0;
 293
 294     ass_set_fonts(priv, path, family, font_fontconfig + 1, NULL, 1);
 295
 296     free(dir);
 297     free(path);
 298     free(family);
 299 }
 300
 301 static void message_callback(int level, const char *format, va_list va, void *ctx)
 302 {
 303     mp_msg(MSGT_ASS, level, "[ass] ");
 304     mp_msg_va(MSGT_ASS, level, format, va);
 305     // libass messages lack trailing \n
 306     mp_msg(MSGT_ASS, level, "\n");
 307 }
 308
 309 ASS_Library *mp_ass_init(void)
 310 {
 311     ASS_Library *priv;
 312     char *path = get_path("fonts");
 313     priv = ass_library_init();
 314     ass_set_message_cb(priv, message_callback, NULL);
 315     ass_set_fonts_dir(priv, path);
 316     ass_set_extract_fonts(priv, use_embedded_fonts);
 317     ass_set_style_overrides(priv, ass_force_style_list);
 318     free(path);
 319     return priv;
 320 }
 321
 322 int ass_force_reload = 0;       // flag set if global ass-related settings were changed
 323
 324 ASS_Image *mp_ass_render_frame(ASS_Renderer *priv, ASS_Track *track,
 325                                long long now, int *detect_change)
 326 {
 327     if (ass_force_reload) {
 328         ass_set_margins(priv, ass_top_margin, ass_bottom_margin, 0, 0);
 329         ass_set_use_margins(priv, ass_use_margins);
 330         ass_set_font_scale(priv, ass_font_scale);
 331         ass_force_reload = 0;
 332     }
 333     return ass_render_frame(priv, track, now, detect_change);
 334 }