libass/ass_mp.c

   1 // -*- c-basic-offset: 8; indent-tabs-mode: t -*-
   2 // vim:ts=8:sw=8:noet:ai:
   3 /*
   4  * Copyright (C) 2006 Evgeniy Stepanov <eugeni.stepanov@gmail.com>
   5  *
   6  * This file is part of libass.
   7  *
   8  * libass is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2 of the License, or
  11  * (at your option) any later version.
  12  *
  13  * libass is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License along
  19  * with libass; if not, write to the Free Software Foundation, Inc.,
  20  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  21  */
  22
  23 #include <inttypes.h>
  24 #include <string.h>
  25 #include <stdlib.h>
  26
  27 #include "mp_msg.h"
  28 #include "path.h"
  29
  30 #include "ass_mp.h"
  31 #include "help_mp.h"
  32 #include "stream/stream.h"
  33
  34 #ifdef CONFIG_FONTCONFIG
  35 #include <fontconfig/fontconfig.h>
  36 #endif
  37
  38 // libass-related command line options
  39 ass_library_t* ass_library;
  40 int ass_enabled = 0;
  41 float ass_font_scale = 1.;
  42 float ass_line_spacing = 0.;
  43 int ass_top_margin = 0;
  44 int ass_bottom_margin = 0;
  45 #if defined(FC_VERSION) && (FC_VERSION >= 20402)
  46 int extract_embedded_fonts = 1;
  47 #else
  48 int extract_embedded_fonts = 0;
  49 #endif
  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_NATIVE + 4; // native 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_t* ass_default_track(ass_library_t* library) {
  74         ass_track_t* track = ass_new_track(library);
  75
  76         track->track_type = TRACK_TYPE_ASS;
  77         track->Timer = 100.;
  78         track->PlayResY = 288;
  79         track->WrapStyle = 0;
  80
  81         if (ass_styles_file)
  82                 ass_read_styles(track, ass_styles_file, sub_cp);
  83
  84         if (track->n_styles == 0) {
  85                 ass_style_t* style;
  86                 int sid;
  87                 double fs;
  88                 uint32_t c1, c2;
  89
  90                 sid = ass_alloc_style(track);
  91                 style = track->styles + sid;
  92                 style->Name = strdup("Default");
  93                 style->FontName = (font_fontconfig >= 0 && sub_font_name) ? strdup(sub_font_name) : (font_fontconfig >= 0 && font_name) ? strdup(font_name) : strdup("Sans");
  94                 style->treat_fontname_as_pattern = 1;
  95
  96                 fs = track->PlayResY * text_font_scale_factor / 100.;
  97                 // approximate autoscale coefficients
  98                 if (subtitle_autoscale == 2)
  99                         fs *= 1.3;
 100                 else if (subtitle_autoscale == 3)
 101                         fs *= 1.4;
 102                 style->FontSize = fs;
 103
 104                 if (ass_color) c1 = strtoll(ass_color, NULL, 16);
 105                 else c1 = 0xFFFF0000;
 106                 if (ass_border_color) c2 = strtoll(ass_border_color, NULL, 16);
 107                 else c2 = 0x00000000;
 108
 109                 style->PrimaryColour = c1;
 110                 style->SecondaryColour = c1;
 111                 style->OutlineColour = c2;
 112                 style->BackColour = 0x00000000;
 113                 style->BorderStyle = 1;
 114                 style->Alignment = 2;
 115                 style->Outline = 2;
 116                 style->MarginL = 10;
 117                 style->MarginR = 10;
 118                 style->MarginV = 5;
 119                 style->ScaleX = 1.;
 120                 style->ScaleY = 1.;
 121         }
 122
 123         process_force_style(track);
 124         return track;
 125 }
 126
 127 static int check_duplicate_plaintext_event(ass_track_t* track)
 128 {
 129         int i;
 130         ass_event_t* evt = track->events + track->n_events - 1;
 131
 132         for (i = 0; i<track->n_events - 1; ++i) // ignoring last event, it is the one we are comparing with
 133                 if (track->events[i].Start == evt->Start &&
 134                     track->events[i].Duration == evt->Duration &&
 135                     strcmp(track->events[i].Text, evt->Text) == 0)
 136                         return 1;
 137         return 0;
 138 }
 139
 140 /**
 141  * \brief Convert subtitle to ass_event_t for the given track
 142  * \param ass_track_t track
 143  * \param sub subtitle to convert
 144  * \return event id
 145  * note: assumes that subtitle is _not_ fps-based; caller must manually correct
 146  *   Start and Duration in other case.
 147  **/
 148 int ass_process_subtitle(ass_track_t* track, subtitle* sub)
 149 {
 150         int eid;
 151         ass_event_t* event;
 152         int len = 0, j;
 153         char* p;
 154         char* end;
 155
 156         eid = ass_alloc_event(track);
 157         event = track->events + eid;
 158
 159         event->Start = sub->start * 10;
 160         event->Duration = (sub->end - sub->start) * 10;
 161         event->Style = 0;
 162
 163         for (j = 0; j < sub->lines; ++j)
 164                 len += sub->text[j] ? strlen(sub->text[j]) : 0;
 165
 166         len += 2 * sub->lines; // '\N', including the one after the last line
 167         len += 6; // {\anX}
 168         len += 1; // '\0'
 169
 170         event->Text = malloc(len);
 171         end = event->Text + len;
 172         p = event->Text;
 173
 174         if (sub->alignment)
 175                 p += snprintf(p, end - p, "{\\an%d}", sub->alignment);
 176
 177         for (j = 0; j < sub->lines; ++j)
 178                 p += snprintf(p, end - p, "%s\\N", sub->text[j]);
 179
 180         if (sub->lines > 0) p-=2; // remove last "\N"
 181         *p = 0;
 182
 183         if (check_duplicate_plaintext_event(track)) {
 184                 ass_free_event(track, eid);
 185                 track->n_events--;
 186                 return -1;
 187         }
 188
 189         mp_msg(MSGT_ASS, MSGL_V, "plaintext event at %" PRId64 ", +%" PRId64 ": %s  \n",
 190                         (int64_t)event->Start, (int64_t)event->Duration, event->Text);
 191
 192         return eid;
 193 }
 194
 195
 196 /**
 197  * \brief Convert subdata to ass_track
 198  * \param subdata subtitles struct from subreader
 199  * \param fps video framerate
 200  * \return newly allocated ass_track, filled with subtitles from subdata
 201  */
 202 ass_track_t* ass_read_subdata(ass_library_t* library, sub_data* subdata, double fps) {
 203         ass_track_t* track;
 204         int i;
 205
 206         track = ass_default_track(library);
 207         track->name = subdata->filename ? strdup(subdata->filename) : 0;
 208
 209         for (i = 0; i < subdata->sub_num; ++i) {
 210                 int eid = ass_process_subtitle(track, subdata->subtitles + i);
 211                 if (eid < 0)
 212                         continue;
 213                 if (!subdata->sub_uses_time) {
 214                         track->events[eid].Start *= 100. / fps;
 215                         track->events[eid].Duration *= 100. / fps;
 216                 }
 217         }
 218         return track;
 219 }
 220
 221 ass_track_t* ass_read_stream(ass_library_t* library, const char *fname, char *charset) {
 222         int i;
 223         char *buf = NULL;
 224         ass_track_t *track;
 225         size_t sz = 0;
 226         size_t buf_alloc = 0;
 227         stream_t *fd;
 228
 229         fd = open_stream(fname, NULL, &i);
 230         if (!fd) {
 231                 mp_msg(MSGT_ASS, MSGL_WARN, MSGTR_LIBASS_FopenFailed, fname);
 232                 return NULL;
 233         }
 234         if (fd->end_pos > STREAM_BUFFER_SIZE)
 235                 /* read entire file if size is known */
 236                 buf_alloc = fd->end_pos;
 237         for (;;) {
 238                 if (buf_alloc >= 100*1024*1024) {
 239                         mp_msg(MSGT_ASS, MSGL_INFO, MSGTR_LIBASS_RefusingToLoadSubtitlesLargerThan100M, fname);
 240                         sz = 0;
 241                         break;
 242                 }
 243                 if (buf_alloc < sz + STREAM_BUFFER_SIZE)
 244                         buf_alloc += STREAM_BUFFER_SIZE;
 245                 buf = realloc(buf, buf_alloc + 1);
 246                 i = stream_read(fd, buf + sz, buf_alloc - sz);
 247                 if (i <= 0) break;
 248                 sz += i;
 249         }
 250         free_stream(fd);
 251         if (!sz) {
 252                 free(buf);
 253                 return NULL;
 254         }
 255         buf[sz] = 0;
 256         buf = realloc(buf, sz + 1);
 257         track = ass_read_memory(library, buf, sz, charset);
 258         if (track) {
 259                 free(track->name);
 260                 track->name = strdup(fname);
 261         }
 262         free(buf);
 263         return track;
 264 }
 265
 266 void ass_configure(ass_renderer_t* priv, int w, int h, int unscaled) {
 267         int hinting;
 268         ass_set_frame_size(priv, w, h);
 269         ass_set_margins(priv, ass_top_margin, ass_bottom_margin, 0, 0);
 270         ass_set_use_margins(priv, ass_use_margins);
 271         ass_set_font_scale(priv, ass_font_scale);
 272         if (!unscaled && (ass_hinting & 4))
 273                 hinting = 0;
 274         else
 275                 hinting = ass_hinting & 3;
 276         ass_set_hinting(priv, hinting);
 277         ass_set_line_spacing(priv, ass_line_spacing);
 278 }
 279
 280 void ass_configure_fonts(ass_renderer_t* priv) {
 281         char *dir, *path, *family;
 282         dir = get_path("fonts");
 283         if (font_fontconfig < 0 && sub_font_name) path = strdup(sub_font_name);
 284         else if (font_fontconfig < 0 && font_name) path = strdup(font_name);
 285         else path = get_path("subfont.ttf");
 286         if (font_fontconfig >= 0 && sub_font_name) family = strdup(sub_font_name);
 287         else if (font_fontconfig >= 0 && font_name) family = strdup(font_name);
 288         else family = 0;
 289
 290 #if defined(LIBASS_VERSION) && LIBASS_VERSION >= 0x00907010
 291         ass_set_fonts(priv, path, family, font_fontconfig, NULL, 1);
 292 #else
 293         if (font_fontconfig >= 0)
 294                 ass_set_fonts(priv, path, family);
 295         else
 296                 ass_set_fonts_nofc(priv, path, family);
 297 #endif
 298
 299         free(dir);
 300         free(path);
 301         free(family);
 302 }
 303
 304 ass_library_t* ass_init(void) {
 305         ass_library_t* priv;
 306         char* path = get_path("fonts");
 307         priv = ass_library_init();
 308         ass_set_fonts_dir(priv, path);
 309         ass_set_extract_fonts(priv, extract_embedded_fonts);
 310         ass_set_style_overrides(priv, ass_force_style_list);
 311         free(path);
 312         return priv;
 313 }
 314
 315 int ass_force_reload = 0; // flag set if global ass-related settings were changed
 316
 317 ass_image_t* ass_mp_render_frame(ass_renderer_t *priv, ass_track_t* track, long long now, int* detect_change) {
 318         if (ass_force_reload) {
 319                 ass_set_margins(priv, ass_top_margin, ass_bottom_margin, 0, 0);
 320                 ass_set_use_margins(priv, ass_use_margins);
 321                 ass_set_font_scale(priv, ass_font_scale);
 322                 ass_force_reload = 0;
 323         }
 324         return ass_render_frame(priv, track, now, detect_change);
 325 }