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 program 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   This program 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
  17   along with this program; if not, write to the Free Software
  18   Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  19 */
  20
  21 #include <inttypes.h>
  22 #include <string.h>
  23 #include <stdlib.h>
  24
  25 #include "mp_msg.h"
  26 #include "get_path.h"
  27
  28 #include "ass.h"
  29 #include "ass_utils.h"
  30 #include "ass_mp.h"
  31 #include "ass_library.h"
  32
  33 #ifdef HAVE_FONTCONFIG
  34 #include <fontconfig/fontconfig.h>
  35 #endif
  36
  37 // libass-related command line options
  38 ass_library_t* ass_library;
  39 int ass_enabled = 0;
  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 #if defined(FC_VERSION) && (FC_VERSION >= 20402)
  45 int extract_embedded_fonts = 1;
  46 #else
  47 int extract_embedded_fonts = 0;
  48 #endif
  49 char **ass_force_style_list = NULL;
  50 int ass_use_margins = 0;
  51 char* ass_color = NULL;
  52 char* ass_border_color = NULL;
  53 char* ass_styles_file = NULL;
  54 int ass_hinting = ASS_HINTING_NATIVE + 4; // native hinting for unscaled osd
  55
  56 #ifdef HAVE_FONTCONFIG
  57 extern int font_fontconfig;
  58 #else
  59 static int font_fontconfig = -1;
  60 #endif
  61 extern char* font_name;
  62 extern char* sub_font_name;
  63 extern float text_font_scale_factor;
  64 extern int subtitle_autoscale;
  65
  66 #ifdef USE_ICONV
  67 extern char* sub_cp;
  68 #else
  69 static char* sub_cp = 0;
  70 #endif
  71
  72 extern void process_force_style(ass_track_t* track);
  73
  74 ass_track_t* ass_default_track(ass_library_t* library) {
  75         ass_track_t* 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                 ass_style_t* style;
  87                 int sid;
  88                 double fs;
  89                 uint32_t c1, c2;
  90
  91                 sid = ass_alloc_style(track);
  92                 style = track->styles + sid;
  93                 style->Name = strdup("Default");
  94                 style->FontName = (font_fontconfig >= 0 && sub_font_name) ? strdup(sub_font_name) : (font_fontconfig >= 0 && font_name) ? strdup(font_name) : strdup("Sans");
  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 void ass_configure(ass_renderer_t* priv, int w, int h, int unscaled) {
 222         int hinting;
 223         ass_set_frame_size(priv, w, h);
 224         ass_set_margins(priv, ass_top_margin, ass_bottom_margin, 0, 0);
 225         ass_set_use_margins(priv, ass_use_margins);
 226         ass_set_font_scale(priv, ass_font_scale);
 227         if (!unscaled && (ass_hinting & 4))
 228                 hinting = 0;
 229         else
 230                 hinting = ass_hinting & 3;
 231         ass_set_hinting(priv, hinting);
 232         ass_set_line_spacing(priv, ass_line_spacing);
 233 }
 234
 235 void ass_configure_fonts(ass_renderer_t* priv) {
 236         char *dir, *path, *family;
 237         dir = get_path("fonts");
 238         if (font_fontconfig < 0 && sub_font_name) path = strdup(sub_font_name);
 239         else if (font_fontconfig < 0 && font_name) path = strdup(font_name);
 240         else path = get_path("subfont.ttf");
 241         if (font_fontconfig >= 0 && sub_font_name) family = strdup(sub_font_name);
 242         else if (font_fontconfig >= 0 && font_name) family = strdup(font_name);
 243         else family = 0;
 244
 245         ass_set_fonts(priv, path, family);
 246
 247         free(dir);
 248         free(path);
 249         free(family);
 250 }
 251
 252 ass_library_t* ass_init(void) {
 253         ass_library_t* priv;
 254         char* path = get_path("fonts");
 255         priv = ass_library_init();
 256         ass_set_fonts_dir(priv, path);
 257         ass_set_extract_fonts(priv, extract_embedded_fonts);
 258         ass_set_style_overrides(priv, ass_force_style_list);
 259         free(path);
 260         return priv;
 261 }