ass_mp.c

   1 /*
   2  * Copyright (C) 2006 Evgeniy Stepanov <eugeni.stepanov@gmail.com>
   3  *
   4  * This file is part of MPlayer.
   5  *
   6  * MPlayer 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  * MPlayer 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 along
  17  * with libass; if not, write to the Free Software Foundation, Inc.,
  18  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  19  */
  20
  21 #include <inttypes.h>
  22 #include <string.h>
  23 #include <stdlib.h>
  24 #include <stdarg.h>
  25 #include <stdbool.h>
  26
  27 #include <ass/ass.h>
  28 #include <ass/ass_types.h>
  29
  30 #include <libavutil/common.h>
  31
  32 #include "config.h"
  33 #include "mp_msg.h"
  34 #include "path.h"
  35 #include "ass_mp.h"
  36 #include "subreader.h"
  37 #include "stream/stream.h"
  38
  39 #ifdef CONFIG_FONTCONFIG
  40 #include <fontconfig/fontconfig.h>
  41 #endif
  42
  43 // libass-related command line options
  44 ASS_Library *ass_library;
  45 float ass_font_scale = 1.;
  46 float ass_line_spacing = 0.;
  47 int ass_top_margin = 0;
  48 int ass_bottom_margin = 0;
  49 int use_embedded_fonts = 1;
  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_LIGHT + 4;       // light 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 void process_force_style(ASS_Track *track);
  74
  75 ASS_Track *ass_default_track(ASS_Library *library)
  76 {
  77     ASS_Track *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 *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
  97                            && sub_font_name) ? strdup(sub_font_name)
  98             : (font_fontconfig >= 0
  99                && font_name) ? strdup(font_name) : strdup("Sans");
 100         style->treat_fontname_as_pattern = 1;
 101
 102         fs = track->PlayResY * text_font_scale_factor / 100.;
 103         // approximate autoscale coefficients
 104         if (subtitle_autoscale == 2)
 105             fs *= 1.3;
 106         else if (subtitle_autoscale == 3)
 107             fs *= 1.4;
 108         style->FontSize = fs;
 109
 110         if (ass_color)
 111             c1 = strtoll(ass_color, NULL, 16);
 112         else
 113             c1 = 0xFFFF0000;
 114         if (ass_border_color)
 115             c2 = strtoll(ass_border_color, NULL, 16);
 116         else
 117             c2 = 0x00000000;
 118
 119         style->PrimaryColour = c1;
 120         style->SecondaryColour = c1;
 121         style->OutlineColour = c2;
 122         style->BackColour = 0x00000000;
 123         style->BorderStyle = 1;
 124         style->Alignment = 2;
 125         style->Outline = 2;
 126         style->MarginL = 10;
 127         style->MarginR = 10;
 128         style->MarginV = 5;
 129         style->ScaleX = 1.;
 130         style->ScaleY = 1.;
 131     }
 132
 133     ass_process_force_style(track);
 134     return track;
 135 }
 136
 137 static int check_duplicate_plaintext_event(ASS_Track *track)
 138 {
 139     int i;
 140     ASS_Event *evt = track->events + track->n_events - 1;
 141
 142     for (i = 0; i < track->n_events - 1; ++i)   // ignoring last event, it is the one we are comparing with
 143         if (track->events[i].Start == evt->Start &&
 144             track->events[i].Duration == evt->Duration &&
 145             strcmp(track->events[i].Text, evt->Text) == 0)
 146             return 1;
 147     return 0;
 148 }
 149
 150 /**
 151  * \brief Convert subtitle to ASS_Events for the given track
 152  * \param track track
 153  * \param sub subtitle to convert
 154  * \return event id
 155  * note: assumes that subtitle is _not_ fps-based; caller must manually correct
 156  *   Start and Duration in other case.
 157  **/
 158 static int ass_process_subtitle(ASS_Track *track, subtitle *sub)
 159 {
 160     int eid;
 161     ASS_Event *event;
 162     int len = 0, j;
 163     char *p;
 164     char *end;
 165
 166     eid = ass_alloc_event(track);
 167     event = track->events + eid;
 168
 169     event->Start = sub->start * 10;
 170     event->Duration = (sub->end - sub->start) * 10;
 171     event->Style = 0;
 172
 173     for (j = 0; j < sub->lines; ++j)
 174         len += sub->text[j] ? strlen(sub->text[j]) : 0;
 175
 176     len += 2 * sub->lines;      // '\N', including the one after the last line
 177     len += 6;                   // {\anX}
 178     len += 1;                   // '\0'
 179
 180     event->Text = malloc(len);
 181     end = event->Text + len;
 182     p = event->Text;
 183
 184     if (sub->alignment)
 185         p += snprintf(p, end - p, "{\\an%d}", sub->alignment);
 186
 187     for (j = 0; j < sub->lines; ++j)
 188         p += snprintf(p, end - p, "%s\\N", sub->text[j]);
 189
 190     if (sub->lines > 0)
 191         p -= 2;                 // remove last "\N"
 192     *p = 0;
 193
 194     if (check_duplicate_plaintext_event(track)) {
 195         ass_free_event(track, eid);
 196         track->n_events--;
 197         return -1;
 198     }
 199
 200     mp_msg(MSGT_ASS, MSGL_V,
 201            "plaintext event at %" PRId64 ", +%" PRId64 ": %s  \n",
 202            (int64_t) event->Start, (int64_t) event->Duration, event->Text);
 203
 204     return eid;
 205 }
 206
 207
 208 /**
 209  * \brief Convert subdata to ASS_Track
 210  * \param subdata subtitles struct from subreader
 211  * \param fps video framerate
 212  * \return newly allocated ASS_Track, filled with subtitles from subdata
 213  */
 214 ASS_Track *ass_read_subdata(ASS_Library *library, sub_data *subdata,
 215                             double fps)
 216 {
 217     ASS_Track *track;
 218     int i;
 219
 220     track = ass_default_track(library);
 221     track->name = subdata->filename ? strdup(subdata->filename) : 0;
 222
 223     for (i = 0; i < subdata->sub_num; ++i) {
 224         int eid = ass_process_subtitle(track, subdata->subtitles + i);
 225         if (eid < 0)
 226             continue;
 227         if (!subdata->sub_uses_time) {
 228             track->events[eid].Start *= 100. / fps;
 229             track->events[eid].Duration *= 100. / fps;
 230         }
 231     }
 232     return track;
 233 }
 234
 235 ASS_Track *ass_read_stream(ASS_Library *library, const char *fname, char *charset)
 236 {
 237     int i;
 238     char *buf = NULL;
 239     ASS_Track *track;
 240     size_t sz = 0;
 241     size_t buf_alloc = 0;
 242     stream_t *fd;
 243
 244     fd = open_stream(fname, NULL, NULL);
 245     if (!fd)
 246         // Stream code should have printed an error already
 247         return NULL;
 248     if (fd->end_pos > STREAM_BUFFER_SIZE)
 249         /* read entire file if size is known */
 250         buf_alloc = fd->end_pos;
 251     else
 252         buf_alloc = 1000;
 253     for (;;) {
 254         if (sz > 100000000) {
 255             mp_tmsg(MSGT_ASS, MSGL_ERR, "Refusing to load subtitle file "
 256                     "larger than 100 MB: %s\n", fname);
 257             sz = 0;
 258             break;
 259         }
 260         buf_alloc = FFMAX(buf_alloc, sz + (sz >> 1));
 261         buf_alloc = FFMIN(buf_alloc, 100000001);
 262         buf = realloc(buf, buf_alloc + 1);
 263         i = stream_read(fd, buf + sz, buf_alloc - sz);
 264         if (i <= 0)
 265             break;
 266         sz += i;
 267     }
 268     free_stream(fd);
 269     if (!sz) {
 270         free(buf);
 271         return NULL;
 272     }
 273     buf[sz] = 0;
 274     buf = realloc(buf, sz + 1);
 275     track = ass_read_memory(library, buf, sz, charset);
 276     if (track) {
 277         free(track->name);
 278         track->name = strdup(fname);
 279     }
 280     free(buf);
 281     return track;
 282 }
 283
 284 void ass_configure(ASS_Renderer *priv, int w, int h, bool unscaled)
 285 {
 286     int hinting;
 287     ass_set_frame_size(priv, w, h);
 288     ass_set_margins(priv, ass_top_margin, ass_bottom_margin, 0, 0);
 289     ass_set_use_margins(priv, ass_use_margins);
 290     ass_set_font_scale(priv, ass_font_scale);
 291     if (!unscaled && (ass_hinting & 4))
 292         hinting = 0;
 293     else
 294         hinting = ass_hinting & 3;
 295     ass_set_hinting(priv, hinting);
 296     ass_set_line_spacing(priv, ass_line_spacing);
 297 }
 298
 299 void ass_configure_fonts(ASS_Renderer *priv)
 300 {
 301     char *dir, *path, *family;
 302     dir = get_path("fonts");
 303     if (font_fontconfig < 0 && sub_font_name)
 304         path = strdup(sub_font_name);
 305     else if (font_fontconfig < 0 && font_name)
 306         path = strdup(font_name);
 307     else
 308         path = get_path("subfont.ttf");
 309     if (font_fontconfig >= 0 && sub_font_name)
 310         family = strdup(sub_font_name);
 311     else if (font_fontconfig >= 0 && font_name)
 312         family = strdup(font_name);
 313     else
 314         family = 0;
 315
 316     ass_set_fonts(priv, path, family, font_fontconfig + 1, NULL, 1);
 317
 318     free(dir);
 319     free(path);
 320     free(family);
 321 }
 322
 323 static void message_callback(int level, const char *format, va_list va, void *ctx)
 324 {
 325     mp_msg(MSGT_ASS, level, "[ass] ");
 326     mp_msg_va(MSGT_ASS, level, format, va);
 327     // libass messages lack trailing \n
 328     mp_msg(MSGT_ASS, level, "\n");
 329 }
 330
 331 ASS_Library *ass_init(void)
 332 {
 333     ASS_Library *priv;
 334     char *path = get_path("fonts");
 335     priv = ass_library_init();
 336     ass_set_message_cb(priv, message_callback, NULL);
 337     ass_set_fonts_dir(priv, path);
 338     ass_set_extract_fonts(priv, use_embedded_fonts);
 339     ass_set_style_overrides(priv, ass_force_style_list);
 340     free(path);
 341     return priv;
 342 }
 343
 344 int ass_force_reload = 0;       // flag set if global ass-related settings were changed
 345
 346 ASS_Image *ass_mp_render_frame(ASS_Renderer *priv, ASS_Track *track,
 347                                long long now, int *detect_change)
 348 {
 349     if (ass_force_reload) {
 350         ass_set_margins(priv, ass_top_margin, ass_bottom_margin, 0, 0);
 351         ass_set_use_margins(priv, ass_use_margins);
 352         ass_set_font_scale(priv, ass_font_scale);
 353         ass_force_reload = 0;
 354     }
 355     return ass_render_frame(priv, track, now, detect_change);
 356 }