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.h"
  31 #include "ass_utils.h"
  32 #include "ass_mp.h"
  33 #include "ass_library.h"
  34
  35 #ifdef CONFIG_FONTCONFIG
  36 #include <fontconfig/fontconfig.h>
  37 #endif
  38
  39 // libass-related command line options
  40 ass_library_t* ass_library;
  41 int ass_enabled = 0;
  42 float ass_font_scale = 1.;
  43 float ass_line_spacing = 0.;
  44 int ass_top_margin = 0;
  45 int ass_bottom_margin = 0;
  46 #if defined(FC_VERSION) && (FC_VERSION >= 20402)
  47 int extract_embedded_fonts = 1;
  48 #else
  49 int extract_embedded_fonts = 0;
  50 #endif
  51 char **ass_force_style_list = NULL;
  52 int ass_use_margins = 0;
  53 char* ass_color = NULL;
  54 char* ass_border_color = NULL;
  55 char* ass_styles_file = NULL;
  56 int ass_hinting = ASS_HINTING_NATIVE + 4; // native hinting for unscaled osd
  57
  58 #ifdef CONFIG_FONTCONFIG
  59 extern int font_fontconfig;
  60 #else
  61 static int font_fontconfig = -1;
  62 #endif
  63 extern char* font_name;
  64 extern char* sub_font_name;
  65 extern float text_font_scale_factor;
  66 extern int subtitle_autoscale;
  67
  68 #ifdef CONFIG_ICONV
  69 extern char* sub_cp;
  70 #else
  71 static char* sub_cp = 0;
  72 #endif
  73
  74 void process_force_style(ass_track_t* track);
  75
  76 ass_track_t* ass_default_track(ass_library_t* library) {
  77         ass_track_t* track = ass_new_track(library);
  78
  79         track->track_type = TRACK_TYPE_ASS;
  80         track->Timer = 100.;
  81         track->PlayResY = 288;
  82         track->WrapStyle = 0;
  83
  84         if (ass_styles_file)
  85                 ass_read_styles(track, ass_styles_file, sub_cp);
  86
  87         if (track->n_styles == 0) {
  88                 ass_style_t* style;
  89                 int sid;
  90                 double fs;
  91                 uint32_t c1, c2;
  92
  93                 sid = ass_alloc_style(track);
  94                 style = track->styles + sid;
  95                 style->Name = strdup("Default");
  96                 style->FontName = (font_fontconfig >= 0 && sub_font_name) ? strdup(sub_font_name) : (font_fontconfig >= 0 && font_name) ? strdup(font_name) : strdup("Sans");
  97                 style->treat_fontname_as_pattern = 1;
  98
  99                 fs = track->PlayResY * text_font_scale_factor / 100.;
 100                 // approximate autoscale coefficients
 101                 if (subtitle_autoscale == 2)
 102                         fs *= 1.3;
 103                 else if (subtitle_autoscale == 3)
 104                         fs *= 1.4;
 105                 style->FontSize = fs;
 106
 107                 if (ass_color) c1 = strtoll(ass_color, NULL, 16);
 108                 else c1 = 0xFFFF0000;
 109                 if (ass_border_color) c2 = strtoll(ass_border_color, NULL, 16);
 110                 else c2 = 0x00000000;
 111
 112                 style->PrimaryColour = c1;
 113                 style->SecondaryColour = c1;
 114                 style->OutlineColour = c2;
 115                 style->BackColour = 0x00000000;
 116                 style->BorderStyle = 1;
 117                 style->Alignment = 2;
 118                 style->Outline = 2;
 119                 style->MarginL = 10;
 120                 style->MarginR = 10;
 121                 style->MarginV = 5;
 122                 style->ScaleX = 1.;
 123                 style->ScaleY = 1.;
 124         }
 125
 126         process_force_style(track);
 127         return track;
 128 }
 129
 130 static int check_duplicate_plaintext_event(ass_track_t* track)
 131 {
 132         int i;
 133         ass_event_t* evt = track->events + track->n_events - 1;
 134
 135         for (i = 0; i<track->n_events - 1; ++i) // ignoring last event, it is the one we are comparing with
 136                 if (track->events[i].Start == evt->Start &&
 137                     track->events[i].Duration == evt->Duration &&
 138                     strcmp(track->events[i].Text, evt->Text) == 0)
 139                         return 1;
 140         return 0;
 141 }
 142
 143 /**
 144  * \brief Convert subtitle to ass_event_t for the given track
 145  * \param ass_track_t track
 146  * \param sub subtitle to convert
 147  * \return event id
 148  * note: assumes that subtitle is _not_ fps-based; caller must manually correct
 149  *   Start and Duration in other case.
 150  **/
 151 int ass_process_subtitle(ass_track_t* track, subtitle* sub)
 152 {
 153         int eid;
 154         ass_event_t* event;
 155         int len = 0, j;
 156         char* p;
 157         char* end;
 158
 159         eid = ass_alloc_event(track);
 160         event = track->events + eid;
 161
 162         event->Start = sub->start * 10;
 163         event->Duration = (sub->end - sub->start) * 10;
 164         event->Style = 0;
 165
 166         for (j = 0; j < sub->lines; ++j)
 167                 len += sub->text[j] ? strlen(sub->text[j]) : 0;
 168
 169         len += 2 * sub->lines; // '\N', including the one after the last line
 170         len += 6; // {\anX}
 171         len += 1; // '\0'
 172
 173         event->Text = malloc(len);
 174         end = event->Text + len;
 175         p = event->Text;
 176
 177         if (sub->alignment)
 178                 p += snprintf(p, end - p, "{\\an%d}", sub->alignment);
 179
 180         for (j = 0; j < sub->lines; ++j)
 181                 p += snprintf(p, end - p, "%s\\N", sub->text[j]);
 182
 183         if (sub->lines > 0) p-=2; // remove last "\N"
 184         *p = 0;
 185
 186         if (check_duplicate_plaintext_event(track)) {
 187                 ass_free_event(track, eid);
 188                 track->n_events--;
 189                 return -1;
 190         }
 191
 192         mp_msg(MSGT_ASS, MSGL_V, "plaintext event at %" PRId64 ", +%" PRId64 ": %s  \n",
 193                         (int64_t)event->Start, (int64_t)event->Duration, event->Text);
 194
 195         return eid;
 196 }
 197
 198
 199 /**
 200  * \brief Convert subdata to ass_track
 201  * \param subdata subtitles struct from subreader
 202  * \param fps video framerate
 203  * \return newly allocated ass_track, filled with subtitles from subdata
 204  */
 205 ass_track_t* ass_read_subdata(ass_library_t* library, sub_data* subdata, double fps) {
 206         ass_track_t* track;
 207         int i;
 208
 209         track = ass_default_track(library);
 210         track->name = subdata->filename ? strdup(subdata->filename) : 0;
 211
 212         for (i = 0; i < subdata->sub_num; ++i) {
 213                 int eid = ass_process_subtitle(track, subdata->subtitles + i);
 214                 if (eid < 0)
 215                         continue;
 216                 if (!subdata->sub_uses_time) {
 217                         track->events[eid].Start *= 100. / fps;
 218                         track->events[eid].Duration *= 100. / fps;
 219                 }
 220         }
 221         return track;
 222 }
 223
 224 void ass_configure(ass_renderer_t* priv, int w, int h, int unscaled) {
 225         int hinting;
 226         ass_set_frame_size(priv, w, h);
 227         ass_set_margins(priv, ass_top_margin, ass_bottom_margin, 0, 0);
 228         ass_set_use_margins(priv, ass_use_margins);
 229         ass_set_font_scale(priv, ass_font_scale);
 230         if (!unscaled && (ass_hinting & 4))
 231                 hinting = 0;
 232         else
 233                 hinting = ass_hinting & 3;
 234         ass_set_hinting(priv, hinting);
 235         ass_set_line_spacing(priv, ass_line_spacing);
 236 }
 237
 238 void ass_configure_fonts(ass_renderer_t* priv) {
 239         char *dir, *path, *family;
 240         dir = get_path("fonts");
 241         if (font_fontconfig < 0 && sub_font_name) path = strdup(sub_font_name);
 242         else if (font_fontconfig < 0 && font_name) path = strdup(font_name);
 243         else path = get_path("subfont.ttf");
 244         if (font_fontconfig >= 0 && sub_font_name) family = strdup(sub_font_name);
 245         else if (font_fontconfig >= 0 && font_name) family = strdup(font_name);
 246         else family = 0;
 247
 248         if (font_fontconfig >= 0)
 249                 ass_set_fonts(priv, path, family);
 250         else
 251                 ass_set_fonts_nofc(priv, path, family);
 252
 253         free(dir);
 254         free(path);
 255         free(family);
 256 }
 257
 258 ass_library_t* ass_init(void) {
 259         ass_library_t* priv;
 260         char* path = get_path("fonts");
 261         priv = ass_library_init();
 262         ass_set_fonts_dir(priv, path);
 263         ass_set_extract_fonts(priv, extract_embedded_fonts);
 264         ass_set_style_overrides(priv, ass_force_style_list);
 265         free(path);
 266         return priv;
 267 }
 268
 269 int ass_force_reload = 0; // flag set if global ass-related settings were changed
 270
 271 ass_image_t* ass_mp_render_frame(ass_renderer_t *priv, ass_track_t* track, long long now, int* detect_change) {
 272         if (ass_force_reload) {
 273                 ass_set_margins(priv, ass_top_margin, ass_bottom_margin, 0, 0);
 274                 ass_set_use_margins(priv, ass_use_margins);
 275                 ass_set_font_scale(priv, ass_font_scale);
 276                 ass_force_reload = 0;
 277         }
 278         return ass_render_frame(priv, track, now, detect_change);
 279 }