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 #include "options.h"
  39
  40 #ifdef CONFIG_FONTCONFIG
  41 extern int font_fontconfig;
  42 #else
  43 static int font_fontconfig = -1;
  44 #endif
  45 extern char *font_name;
  46 extern char *sub_font_name;
  47 extern float text_font_scale_factor;
  48 extern int subtitle_autoscale;
  49
  50 #ifdef CONFIG_ICONV
  51 extern char *sub_cp;
  52 #else
  53 static char *sub_cp = 0;
  54 #endif
  55
  56 ASS_Track *mp_ass_default_track(ASS_Library *library, struct MPOpts *opts)
  57 {
  58     ASS_Track *track = ass_new_track(library);
  59
  60     track->track_type = TRACK_TYPE_ASS;
  61     track->Timer = 100.;
  62     track->PlayResY = 288;
  63     track->WrapStyle = 0;
  64
  65     if (opts->ass_styles_file)
  66         ass_read_styles(track, opts->ass_styles_file, sub_cp);
  67
  68     if (track->n_styles == 0) {
  69         track->Kerning = true;
  70         int sid = ass_alloc_style(track);
  71         track->default_style = sid;
  72         ASS_Style *style = track->styles + sid;
  73         style->Name = strdup("Default");
  74         style->FontName = (font_fontconfig >= 0
  75                            && sub_font_name) ? strdup(sub_font_name)
  76             : (font_fontconfig >= 0
  77                && font_name) ? strdup(font_name) : strdup("Sans");
  78         style->treat_fontname_as_pattern = 1;
  79
  80         double fs = track->PlayResY * text_font_scale_factor / 100.;
  81         /* The font size is always proportional to video height only;
  82          * real -subfont-autoscale behavior is not implemented.
  83          * Apply a correction that corresponds to about 4:3 aspect ratio
  84          * video to get a size somewhat closer to what non-libass rendering
  85          * would produce with the same text_font_scale_factor
  86          * and subtitle_autoscale.
  87          */
  88         if (subtitle_autoscale == 2)
  89             fs *= 1.3;
  90         else if (subtitle_autoscale == 3)
  91             fs *= 1.7;
  92
  93         uint32_t c1 = 0xFFFFFF00;
  94         uint32_t c2 = 0x00000000;
  95         if (opts->ass_color)
  96             c1 = strtoll(opts->ass_color, NULL, 16);
  97         if (opts->ass_border_color)
  98             c2 = strtoll(opts->ass_border_color, NULL, 16);
  99
 100         style->FontSize = fs;
 101         style->PrimaryColour = c1;
 102         style->SecondaryColour = c1;
 103         style->OutlineColour = c2;
 104         style->BackColour = 0x00000000;
 105         style->BorderStyle = 1;
 106         style->Alignment = 2;
 107         style->Outline = fs / 16;
 108         style->MarginL = 10;
 109         style->MarginR = 10;
 110         style->MarginV = 5;
 111         style->ScaleX = 1.;
 112         style->ScaleY = 1.;
 113     }
 114
 115     ass_process_force_style(track);
 116     return track;
 117 }
 118
 119 static int check_duplicate_plaintext_event(ASS_Track *track)
 120 {
 121     int i;
 122     ASS_Event *evt = track->events + track->n_events - 1;
 123
 124     for (i = 0; i < track->n_events - 1; ++i)   // ignoring last event, it is the one we are comparing with
 125         if (track->events[i].Start == evt->Start &&
 126             track->events[i].Duration == evt->Duration &&
 127             strcmp(track->events[i].Text, evt->Text) == 0)
 128             return 1;
 129     return 0;
 130 }
 131
 132 /**
 133  * \brief Convert subtitle to ASS_Events for the given track
 134  * \param track track
 135  * \param sub subtitle to convert
 136  * \return event id
 137  * note: assumes that subtitle is _not_ fps-based; caller must manually correct
 138  *   Start and Duration in other case.
 139  **/
 140 static int ass_process_subtitle(ASS_Track *track, subtitle *sub)
 141 {
 142     int eid;
 143     ASS_Event *event;
 144     int len = 0, j;
 145     char *p;
 146     char *end;
 147
 148     eid = ass_alloc_event(track);
 149     event = track->events + eid;
 150
 151     event->Start = sub->start * 10;
 152     event->Duration = (sub->end - sub->start) * 10;
 153     event->Style = track->default_style;
 154
 155     for (j = 0; j < sub->lines; ++j)
 156         len += sub->text[j] ? strlen(sub->text[j]) : 0;
 157
 158     len += 2 * sub->lines;      // '\N', including the one after the last line
 159     len += 6;                   // {\anX}
 160     len += 1;                   // '\0'
 161
 162     event->Text = malloc(len);
 163     end = event->Text + len;
 164     p = event->Text;
 165
 166     if (sub->alignment)
 167         p += snprintf(p, end - p, "{\\an%d}", sub->alignment);
 168
 169     for (j = 0; j < sub->lines; ++j)
 170         p += snprintf(p, end - p, "%s\\N", sub->text[j]);
 171
 172     if (sub->lines > 0)
 173         p -= 2;                 // remove last "\N"
 174     *p = 0;
 175
 176     if (check_duplicate_plaintext_event(track)) {
 177         ass_free_event(track, eid);
 178         track->n_events--;
 179         return -1;
 180     }
 181
 182     mp_msg(MSGT_ASS, MSGL_V,
 183            "plaintext event at %" PRId64 ", +%" PRId64 ": %s  \n",
 184            (int64_t) event->Start, (int64_t) event->Duration, event->Text);
 185
 186     return eid;
 187 }
 188
 189
 190 /**
 191  * \brief Convert subdata to ASS_Track
 192  * \param subdata subtitles struct from subreader
 193  * \param fps video framerate
 194  * \return newly allocated ASS_Track, filled with subtitles from subdata
 195  */
 196 ASS_Track *mp_ass_read_subdata(ASS_Library *library, struct MPOpts *opts,
 197                                sub_data *subdata, double fps)
 198 {
 199     ASS_Track *track;
 200     int i;
 201
 202     track = mp_ass_default_track(library, opts);
 203     track->name = subdata->filename ? strdup(subdata->filename) : 0;
 204
 205     for (i = 0; i < subdata->sub_num; ++i) {
 206         int eid = ass_process_subtitle(track, subdata->subtitles + i);
 207         if (eid < 0)
 208             continue;
 209         if (!subdata->sub_uses_time) {
 210             track->events[eid].Start *= 100. / fps;
 211             track->events[eid].Duration *= 100. / fps;
 212         }
 213     }
 214     return track;
 215 }
 216
 217 ASS_Track *mp_ass_read_stream(ASS_Library *library, const char *fname,
 218                               char *charset)
 219 {
 220     ASS_Track *track;
 221
 222     struct stream *s = open_stream(fname, NULL, NULL);
 223     if (!s)
 224         // Stream code should have printed an error already
 225         return NULL;
 226     struct bstr content = stream_read_complete(s, NULL, 100000000, 1);
 227     if (content.start == NULL)
 228         mp_tmsg(MSGT_ASS, MSGL_ERR, "Refusing to load subtitle file "
 229                 "larger than 100 MB: %s\n", fname);
 230     free_stream(s);
 231     if (content.len == 0) {
 232         talloc_free(content.start);
 233         return NULL;
 234     }
 235     content.start[content.len] = 0;
 236     track = ass_read_memory(library, content.start, content.len, charset);
 237     if (track) {
 238         free(track->name);
 239         track->name = strdup(fname);
 240     }
 241     talloc_free(content.start);
 242     return track;
 243 }
 244
 245 void mp_ass_configure(ASS_Renderer *priv, struct MPOpts *opts, int w, int h,
 246                       bool unscaled)
 247 {
 248     int hinting;
 249     ass_set_frame_size(priv, w, h);
 250     ass_set_margins(priv, opts->ass_top_margin, opts->ass_bottom_margin, 0, 0);
 251     ass_set_use_margins(priv, opts->ass_use_margins);
 252     ass_set_font_scale(priv, opts->ass_font_scale);
 253     if (!unscaled && (opts->ass_hinting & 4))
 254         hinting = 0;
 255     else
 256         hinting = opts->ass_hinting & 3;
 257     ass_set_hinting(priv, hinting);
 258     ass_set_line_spacing(priv, opts->ass_line_spacing);
 259 }
 260
 261 void mp_ass_configure_fonts(ASS_Renderer *priv)
 262 {
 263     char *dir, *path, *family;
 264     dir = get_path("fonts");
 265     if (font_fontconfig < 0 && sub_font_name)
 266         path = strdup(sub_font_name);
 267     else if (font_fontconfig < 0 && font_name)
 268         path = strdup(font_name);
 269     else
 270         path = get_path("subfont.ttf");
 271     if (font_fontconfig >= 0 && sub_font_name)
 272         family = strdup(sub_font_name);
 273     else if (font_fontconfig >= 0 && font_name)
 274         family = strdup(font_name);
 275     else
 276         family = 0;
 277
 278     ass_set_fonts(priv, path, family, font_fontconfig + 1, NULL, 1);
 279
 280     free(dir);
 281     free(path);
 282     free(family);
 283 }
 284
 285 static void message_callback(int level, const char *format, va_list va, void *ctx)
 286 {
 287     mp_msg(MSGT_ASS, level, "[ass] ");
 288     mp_msg_va(MSGT_ASS, level, format, va);
 289     // libass messages lack trailing \n
 290     mp_msg(MSGT_ASS, level, "\n");
 291 }
 292
 293 ASS_Library *mp_ass_init(struct MPOpts *opts)
 294 {
 295     ASS_Library *priv;
 296     char *path = get_path("fonts");
 297     priv = ass_library_init();
 298     ass_set_message_cb(priv, message_callback, NULL);
 299     ass_set_fonts_dir(priv, path);
 300     ass_set_extract_fonts(priv, opts->use_embedded_fonts);
 301     free(path);
 302     return priv;
 303 }
 304
 305 void mp_ass_reload_options(ASS_Renderer *priv, struct MPOpts *opts)
 306 {
 307     /* This could be needed for vf_ass case if the margins were actually
 308      * runtime configurable, but would be wrong with EOSD:
 309      * ass_set_margins(priv, opts->ass_top_margin, opts->ass_bottom_margin,
 310      *                 0, 0);
 311      */
 312     ass_set_use_margins(priv, opts->ass_use_margins);
 313     ass_set_font_scale(priv, opts->ass_font_scale);
 314 }