libass/ass_library.c

   1 /*
   2  * Copyright (C) 2006 Evgeniy Stepanov <eugeni.stepanov@gmail.com>
   3  *
   4  * This file is part of libass.
   5  *
   6  * libass 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  * libass 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 <stdio.h>
  23 #include <stdlib.h>
  24 #include <string.h>
  25 #include <stdarg.h>
  26
  27 #include "ass.h"
  28 #include "ass_library.h"
  29 #include "ass_utils.h"
  30
  31 static void ass_msg_handler(int level, const char *fmt, va_list va, void *data)
  32 {
  33     if (level > MSGL_INFO)
  34         return;
  35     fprintf(stderr, "[ass] ");
  36     vfprintf(stderr, fmt, va);
  37     fprintf(stderr, "\n");
  38 }
  39
  40 ASS_Library *ass_library_init(void)
  41 {
  42     ASS_Library* lib = calloc(1, sizeof(*lib));
  43     lib->msg_callback = ass_msg_handler;
  44
  45     return lib;
  46 }
  47
  48 void ass_library_done(ASS_Library *priv)
  49 {
  50     if (priv) {
  51         ass_set_fonts_dir(priv, NULL);
  52         ass_set_style_overrides(priv, NULL);
  53         ass_clear_fonts(priv);
  54         free(priv);
  55     }
  56 }
  57
  58 void ass_set_fonts_dir(ASS_Library *priv, const char *fonts_dir)
  59 {
  60     if (priv->fonts_dir)
  61         free(priv->fonts_dir);
  62
  63     priv->fonts_dir = fonts_dir ? strdup(fonts_dir) : 0;
  64 }
  65
  66 void ass_set_extract_fonts(ASS_Library *priv, int extract)
  67 {
  68     priv->extract_fonts = !!extract;
  69 }
  70
  71 void ass_set_style_overrides(ASS_Library *priv, char **list)
  72 {
  73     char **p;
  74     char **q;
  75     int cnt;
  76
  77     if (priv->style_overrides) {
  78         for (p = priv->style_overrides; *p; ++p)
  79             free(*p);
  80         free(priv->style_overrides);
  81     }
  82
  83     if (!list)
  84         return;
  85
  86     for (p = list, cnt = 0; *p; ++p, ++cnt) {
  87     }
  88
  89     priv->style_overrides = malloc((cnt + 1) * sizeof(char *));
  90     for (p = list, q = priv->style_overrides; *p; ++p, ++q)
  91         *q = strdup(*p);
  92     priv->style_overrides[cnt] = NULL;
  93 }
  94
  95 static void grow_array(void **array, int nelem, size_t elsize)
  96 {
  97     if (!(nelem & 31))
  98         *array = realloc(*array, (nelem + 32) * elsize);
  99 }
 100
 101 void ass_add_font(ASS_Library *priv, char *name, char *data, int size)
 102 {
 103     int idx = priv->num_fontdata;
 104     if (!name || !data || !size)
 105         return;
 106     grow_array((void **) &priv->fontdata, priv->num_fontdata,
 107                sizeof(*priv->fontdata));
 108
 109     priv->fontdata[idx].name = strdup(name);
 110
 111     priv->fontdata[idx].data = malloc(size);
 112     memcpy(priv->fontdata[idx].data, data, size);
 113
 114     priv->fontdata[idx].size = size;
 115
 116     priv->num_fontdata++;
 117 }
 118
 119 void ass_clear_fonts(ASS_Library *priv)
 120 {
 121     int i;
 122     for (i = 0; i < priv->num_fontdata; ++i) {
 123         free(priv->fontdata[i].name);
 124         free(priv->fontdata[i].data);
 125     }
 126     free(priv->fontdata);
 127     priv->fontdata = NULL;
 128     priv->num_fontdata = 0;
 129 }
 130
 131 /*
 132  * Register a message callback function with libass.  Without setting one,
 133  * a default handler is used which prints everything with MSGL_INFO or
 134  * higher to the standard output.
 135  *
 136  * \param msg_cb the callback function
 137  * \param data additional data that will be passed to the callback
 138  */
 139 void ass_set_message_cb(ASS_Library *priv,
 140                         void (*msg_cb)(int, const char *, va_list, void *),
 141                         void *data)
 142 {
 143     if (msg_cb) {
 144         priv->msg_callback = msg_cb;
 145         priv->msg_callback_data = data;
 146     }
 147 }