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
  27 #include "ass.h"
  28 #include "ass_utils.h"
  29 #include "ass_mp.h"
  30 #include "ass_library.h"
  31
  32 // libass-related command line options
  33 ass_library_t* ass_library;
  34 int ass_enabled = 0;
  35 float ass_font_scale = 1.;
  36 float ass_line_spacing = 0.;
  37 int ass_top_margin = 0;
  38 int ass_bottom_margin = 0;
  39 int extract_embedded_fonts = 0;
  40 char **ass_force_style_list = NULL;
  41 int ass_use_margins = 0;
  42 char* ass_color = NULL;
  43 char* ass_border_color = NULL;
  44 char* ass_styles_file = NULL;
  45
  46 #ifdef HAVE_FONTCONFIG
  47 extern int font_fontconfig;
  48 #else
  49 static int font_fontconfig = 0;
  50 #endif
  51 extern char* font_name;
  52 extern float text_font_scale_factor;
  53 extern int subtitle_autoscale;
  54
  55 #ifdef USE_ICONV
  56 extern char* sub_cp;
  57 #else
  58 static char* sub_cp = 0;
  59 #endif
  60
  61 extern double ass_internal_font_size_coeff;
  62 extern void process_force_style(ass_track_t* track);
  63
  64 ass_track_t* ass_default_track(ass_library_t* library) {
  65         ass_track_t* track = ass_new_track(library);
  66
  67         track->track_type = TRACK_TYPE_ASS;
  68         track->Timer = 100.;
  69         track->PlayResY = 288;
  70         track->WrapStyle = 0;
  71
  72         if (ass_styles_file)
  73                 ass_read_styles(track, ass_styles_file, sub_cp);
  74
  75         if (track->n_styles == 0) {
  76                 ass_style_t* style;
  77                 int sid;
  78                 double fs;
  79                 uint32_t c1, c2;
  80
  81                 sid = ass_alloc_style(track);
  82                 style = track->styles + sid;
  83                 style->Name = strdup("Default");
  84                 style->FontName = (font_fontconfig && font_name) ? strdup(font_name) : strdup("Sans");
  85
  86                 fs = track->PlayResY * text_font_scale_factor / 100. / ass_internal_font_size_coeff;
  87                 // approximate autoscale coefficients
  88                 if (subtitle_autoscale == 2)
  89                         fs *= 1.3;
  90                 else if (subtitle_autoscale == 3)
  91                         fs *= 1.4;
  92                 style->FontSize = fs;
  93
  94                 if (ass_color) c1 = strtoll(ass_color, NULL, 16);
  95                 else c1 = 0xFFFF0000;
  96                 if (ass_border_color) c2 = strtoll(ass_border_color, NULL, 16);
  97                 else c2 = 0x00000000;
  98
  99                 style->PrimaryColour = c1;
 100                 style->SecondaryColour = c1;
 101                 style->OutlineColour = c2;
 102                 style->BackColour = 0x00000000;
 103                 style->BorderStyle = 1;
 104                 style->Alignment = 2;
 105                 style->Outline = 2;
 106                 style->MarginL = 10;
 107                 style->MarginR = 10;
 108                 style->MarginV = 5;
 109                 style->ScaleX = 1.;
 110                 style->ScaleY = 1.;
 111         }
 112
 113         process_force_style(track);
 114         return track;
 115 }
 116
 117 static int check_duplicate_plaintext_event(ass_track_t* track)
 118 {
 119         int i;
 120         ass_event_t* evt = track->events + track->n_events - 1;
 121
 122         for (i = 0; i<track->n_events - 1; ++i) // ignoring last event, it is the one we are comparing with
 123                 if (track->events[i].Start == evt->Start &&
 124                     track->events[i].Duration == evt->Duration &&
 125                     strcmp(track->events[i].Text, evt->Text) == 0)
 126                         return 1;
 127         return 0;
 128 }
 129
 130 /**
 131  * \brief Convert subtitle to ass_event_t for the given track
 132  * \param ass_track_t track
 133  * \param sub subtitle to convert
 134  * \return event id
 135  * note: assumes that subtitle is _not_ fps-based; caller must manually correct
 136  *   Start and Duration in other case.
 137  **/
 138 int ass_process_subtitle(ass_track_t* track, subtitle* sub)
 139 {
 140         int eid;
 141         ass_event_t* event;
 142         int len = 0, j;
 143         char* p;
 144         char* end;
 145
 146         eid = ass_alloc_event(track);
 147         event = track->events + eid;
 148
 149         event->Start = sub->start * 10;
 150         event->Duration = (sub->end - sub->start) * 10;
 151         event->Style = 0;
 152
 153         for (j = 0; j < sub->lines; ++j)
 154                 len += sub->text[j] ? strlen(sub->text[j]) : 0;
 155
 156         len += 2 * sub->lines; // '\N', including the one after the last line
 157         len += 6; // {\anX}
 158         len += 1; // '\0'
 159
 160         event->Text = malloc(len);
 161         end = event->Text + len;
 162         p = event->Text;
 163
 164         if (sub->alignment)
 165                 p += snprintf(p, end - p, "{\\an%d}", sub->alignment);
 166
 167         for (j = 0; j < sub->lines; ++j)
 168                 p += snprintf(p, end - p, "%s\\N", sub->text[j]);
 169
 170         p-=2; // remove last ' '
 171         *p = 0;
 172
 173         if (check_duplicate_plaintext_event(track)) {
 174                 ass_free_event(track, eid);
 175                 track->n_events--;
 176                 return -1;
 177         }
 178
 179         mp_msg(MSGT_ASS, MSGL_V, "plaintext event at %" PRId64 ", +%" PRId64 ": %s  \n",
 180                         (int64_t)event->Start, (int64_t)event->Duration, event->Text);
 181
 182         return eid;
 183 }
 184
 185
 186 /**
 187  * \brief Convert subdata to ass_track
 188  * \param subdata subtitles struct from subreader
 189  * \param fps video framerate
 190  * \return newly allocated ass_track, filled with subtitles from subdata
 191  */
 192 ass_track_t* ass_read_subdata(ass_library_t* library, sub_data* subdata, double fps) {
 193         ass_track_t* track;
 194         int i;
 195
 196         track = ass_default_track(library);
 197         track->name = subdata->filename ? strdup(subdata->filename) : 0;
 198
 199         for (i = 0; i < subdata->sub_num; ++i) {
 200                 int eid = ass_process_subtitle(track, subdata->subtitles + i);
 201                 if (eid < 0)
 202                         continue;
 203                 if (!subdata->sub_uses_time) {
 204                         track->events[eid].Start *= 100. / fps;
 205                         track->events[eid].Duration *= 100. / fps;
 206                 }
 207         }
 208         return track;
 209 }
 210
 211 char *get_path(char *);
 212
 213 void ass_configure(ass_renderer_t* priv, int w, int h) {
 214         ass_set_frame_size(priv, w, h);
 215         ass_set_margins(priv, ass_top_margin, ass_bottom_margin, 0, 0);
 216         ass_set_use_margins(priv, ass_use_margins);
 217         ass_set_font_scale(priv, ass_font_scale);
 218 }
 219
 220 void ass_configure_fonts(ass_renderer_t* priv) {
 221         char *dir, *path, *family;
 222         dir = get_path("fonts");
 223         if (!font_fontconfig && font_name) path = strdup(font_name);
 224         else path = get_path("subfont.ttf");
 225         if (font_fontconfig && font_name) family = strdup(font_name);
 226         else family = 0;
 227
 228         ass_set_fonts(priv, path, family);
 229
 230         free(dir);
 231         free(path);
 232         free(family);
 233 }
 234
 235 ass_library_t* ass_init() {
 236         ass_library_t* priv;
 237         char* path = get_path("fonts");
 238         priv = ass_library_init();
 239         ass_set_fonts_dir(priv, path);
 240         ass_set_extract_fonts(priv, extract_embedded_fonts);
 241         ass_set_style_overrides(priv, ass_force_style_list);
 242         free(path);
 243         return priv;
 244 }