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 "get_path.h"
  29
  30 #include "ass_mp.h"
  31
  32 #ifdef CONFIG_FONTCONFIG
  33 #include <fontconfig/fontconfig.h>
  34 #endif
  35
  36 // libass-related command line options
  37 ass_library_t* ass_library;
  38 int ass_enabled = 0;
  39 float ass_font_scale = 1.;
  40 float ass_line_spacing = 0.;
  41 int ass_top_margin = 0;
  42 int ass_bottom_margin = 0;
  43 #if defined(FC_VERSION) && (FC_VERSION >= 20402)
  44 int extract_embedded_fonts = 1;
  45 #else
  46 int extract_embedded_fonts = 0;
  47 #endif
  48 char **ass_force_style_list = NULL;
  49 int ass_use_margins = 0;
  50 char* ass_color = NULL;
  51 char* ass_border_color = NULL;
  52 char* ass_styles_file = NULL;
  53 int ass_hinting = ASS_HINTING_NATIVE + 4; // native hinting for unscaled osd
  54
  55 #ifdef CONFIG_FONTCONFIG
  56 extern int font_fontconfig;
  57 #else
  58 static int font_fontconfig = -1;
  59 #endif
  60 extern char* font_name;
  61 extern char* sub_font_name;
  62 extern float text_font_scale_factor;
  63 extern int subtitle_autoscale;
  64
  65 #ifdef CONFIG_ICONV
  66 extern char* sub_cp;
  67 #else
  68 static char* sub_cp = 0;
  69 #endif
  70
  71 ass_track_t* ass_default_track(ass_library_t* library) {
  72         ass_track_t* 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_t* 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 && sub_font_name) ? strdup(sub_font_name) : (font_fontconfig >= 0 && font_name) ? strdup(font_name) : strdup("Sans");
  92                 style->treat_fontname_as_pattern = 1;
  93
  94                 fs = track->PlayResY * text_font_scale_factor / 100.;
  95                 // approximate autoscale coefficients
  96                 if (subtitle_autoscale == 2)
  97                         fs *= 1.3;
  98                 else if (subtitle_autoscale == 3)
  99                         fs *= 1.4;
 100                 style->FontSize = fs;
 101
 102                 if (ass_color) c1 = strtoll(ass_color, NULL, 16);
 103                 else c1 = 0xFFFF0000;
 104                 if (ass_border_color) c2 = strtoll(ass_border_color, NULL, 16);
 105                 else c2 = 0x00000000;
 106
 107                 style->PrimaryColour = c1;
 108                 style->SecondaryColour = c1;
 109                 style->OutlineColour = c2;
 110                 style->BackColour = 0x00000000;
 111                 style->BorderStyle = 1;
 112                 style->Alignment = 2;
 113                 style->Outline = 2;
 114                 style->MarginL = 10;
 115                 style->MarginR = 10;
 116                 style->MarginV = 5;
 117                 style->ScaleX = 1.;
 118                 style->ScaleY = 1.;
 119         }
 120
 121         process_force_style(track);
 122         return track;
 123 }
 124
 125 static int check_duplicate_plaintext_event(ass_track_t* track)
 126 {
 127         int i;
 128         ass_event_t* evt = track->events + track->n_events - 1;
 129
 130         for (i = 0; i<track->n_events - 1; ++i) // ignoring last event, it is the one we are comparing with
 131                 if (track->events[i].Start == evt->Start &&
 132                     track->events[i].Duration == evt->Duration &&
 133                     strcmp(track->events[i].Text, evt->Text) == 0)
 134                         return 1;
 135         return 0;
 136 }
 137
 138 /**
 139  * \brief Convert subtitle to ass_event_t for the given track
 140  * \param ass_track_t track
 141  * \param sub subtitle to convert
 142  * \return event id
 143  * note: assumes that subtitle is _not_ fps-based; caller must manually correct
 144  *   Start and Duration in other case.
 145  **/
 146 int ass_process_subtitle(ass_track_t* track, subtitle* sub)
 147 {
 148         int eid;
 149         ass_event_t* event;
 150         int len = 0, j;
 151         char* p;
 152         char* end;
 153
 154         eid = ass_alloc_event(track);
 155         event = track->events + eid;
 156
 157         event->Start = sub->start * 10;
 158         event->Duration = (sub->end - sub->start) * 10;
 159         event->Style = 0;
 160
 161         for (j = 0; j < sub->lines; ++j)
 162                 len += sub->text[j] ? strlen(sub->text[j]) : 0;
 163
 164         len += 2 * sub->lines; // '\N', including the one after the last line
 165         len += 6; // {\anX}
 166         len += 1; // '\0'
 167
 168         event->Text = malloc(len);
 169         end = event->Text + len;
 170         p = event->Text;
 171
 172         if (sub->alignment)
 173                 p += snprintf(p, end - p, "{\\an%d}", sub->alignment);
 174
 175         for (j = 0; j < sub->lines; ++j)
 176                 p += snprintf(p, end - p, "%s\\N", sub->text[j]);
 177
 178         if (sub->lines > 0) p-=2; // remove last "\N"
 179         *p = 0;
 180
 181         if (check_duplicate_plaintext_event(track)) {
 182                 ass_free_event(track, eid);
 183                 track->n_events--;
 184                 return -1;
 185         }
 186
 187         mp_msg(MSGT_ASS, MSGL_V, "plaintext event at %" PRId64 ", +%" PRId64 ": %s  \n",
 188                         (int64_t)event->Start, (int64_t)event->Duration, event->Text);
 189
 190         return eid;
 191 }
 192
 193
 194 /**
 195  * \brief Convert subdata to ass_track
 196  * \param subdata subtitles struct from subreader
 197  * \param fps video framerate
 198  * \return newly allocated ass_track, filled with subtitles from subdata
 199  */
 200 ass_track_t* ass_read_subdata(ass_library_t* library, sub_data* subdata, double fps) {
 201         ass_track_t* track;
 202         int i;
 203
 204         track = ass_default_track(library);
 205         track->name = subdata->filename ? strdup(subdata->filename) : 0;
 206
 207         for (i = 0; i < subdata->sub_num; ++i) {
 208                 int eid = ass_process_subtitle(track, subdata->subtitles + i);
 209                 if (eid < 0)
 210                         continue;
 211                 if (!subdata->sub_uses_time) {
 212                         track->events[eid].Start *= 100. / fps;
 213                         track->events[eid].Duration *= 100. / fps;
 214                 }
 215         }
 216         return track;
 217 }
 218
 219 void ass_configure(ass_renderer_t* priv, int w, int h, int unscaled) {
 220         int hinting;
 221         ass_set_frame_size(priv, w, h);
 222         ass_set_margins(priv, ass_top_margin, ass_bottom_margin, 0, 0);
 223         ass_set_use_margins(priv, ass_use_margins);
 224         ass_set_font_scale(priv, ass_font_scale);
 225         if (!unscaled && (ass_hinting & 4))
 226                 hinting = 0;
 227         else
 228                 hinting = ass_hinting & 3;
 229         ass_set_hinting(priv, hinting);
 230         ass_set_line_spacing(priv, ass_line_spacing);
 231 }
 232
 233 void ass_configure_fonts(ass_renderer_t* priv) {
 234         char *dir, *path, *family;
 235         dir = get_path("fonts");
 236         if (font_fontconfig < 0 && sub_font_name) path = strdup(sub_font_name);
 237         else if (font_fontconfig < 0 && font_name) path = strdup(font_name);
 238         else path = get_path("subfont.ttf");
 239         if (font_fontconfig >= 0 && sub_font_name) family = strdup(sub_font_name);
 240         else if (font_fontconfig >= 0 && font_name) family = strdup(font_name);
 241         else family = 0;
 242
 243 #if defined(LIBASS_VERSION) && LIBASS_VERSION >= 0x00907010
 244         ass_set_fonts(priv, path, family, font_fontconfig, NULL, 1);
 245 #else
 246         if (font_fontconfig >= 0)
 247                 ass_set_fonts(priv, path, family);
 248         else
 249                 ass_set_fonts_nofc(priv, path, family);
 250 #endif
 251
 252         free(dir);
 253         free(path);
 254         free(family);
 255 }
 256
 257 ass_library_t* ass_init(void) {
 258         ass_library_t* priv;
 259         char* path = get_path("fonts");
 260         priv = ass_library_init();
 261         ass_set_fonts_dir(priv, path);
 262         ass_set_extract_fonts(priv, extract_embedded_fonts);
 263         ass_set_style_overrides(priv, ass_force_style_list);
 264         free(path);
 265         return priv;
 266 }
 267
 268 int ass_force_reload = 0; // flag set if global ass-related settings were changed
 269
 270 ass_image_t* ass_mp_render_frame(ass_renderer_t *priv, ass_track_t* track, long long now, int* detect_change) {
 271         if (ass_force_reload) {
 272                 ass_set_margins(priv, ass_top_margin, ass_bottom_margin, 0, 0);
 273                 ass_set_use_margins(priv, ass_use_margins);
 274                 ass_set_font_scale(priv, ass_font_scale);
 275                 ass_force_reload = 0;
 276         }
 277         return ass_render_frame(priv, track, now, detect_change);
 278 }