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4349 | Serge | 1 | /* |
2 | * Copyright (c) 2012 Clément Bœsch |
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3 | * |
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4 | * This file is part of FFmpeg. |
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5 | * |
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6 | * FFmpeg is free software; you can redistribute it and/or |
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7 | * modify it under the terms of the GNU Lesser General Public |
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8 | * License as published by the Free Software Foundation; either |
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9 | * version 2.1 of the License, or (at your option) any later version. |
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10 | * |
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11 | * FFmpeg is distributed in the hope that it will be useful, |
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12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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14 | * Lesser General Public License for more details. |
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15 | * |
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16 | * You should have received a copy of the GNU Lesser General Public |
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17 | * License along with FFmpeg; if not, write to the Free Software |
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18 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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19 | */ |
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20 | |||
21 | /** |
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22 | * @file |
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23 | * JACOsub subtitle decoder |
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24 | * @see http://unicorn.us.com/jacosub/jscripts.html |
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25 | */ |
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26 | |||
27 | #include |
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28 | #include "ass.h" |
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29 | #include "jacosub.h" |
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30 | #include "libavutil/avstring.h" |
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31 | #include "libavutil/bprint.h" |
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32 | |||
33 | #undef time |
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34 | |||
35 | static int insert_text(AVBPrint *dst, const char *in, const char *arg) |
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36 | { |
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37 | av_bprintf(dst, "%s", arg); |
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38 | return 0; |
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39 | } |
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40 | |||
41 | static int insert_datetime(AVBPrint *dst, const char *in, const char *arg) |
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42 | { |
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43 | char buf[16] = {0}; |
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44 | time_t now = time(0); |
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45 | struct tm ltime; |
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46 | |||
47 | #if HAVE_LOCALTIME_R |
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48 | localtime_r(&now, <ime); |
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49 | #else |
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50 | ltime = *localtime(&now); |
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51 | #endif |
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52 | strftime(buf, sizeof(buf), arg, <ime); |
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53 | av_bprintf(dst, "%s", buf); |
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54 | return 0; |
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55 | } |
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56 | |||
57 | static int insert_color(AVBPrint *dst, const char *in, const char *arg) |
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58 | { |
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59 | return 1; // skip id |
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60 | } |
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61 | |||
62 | static int insert_font(AVBPrint *dst, const char *in, const char *arg) |
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63 | { |
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64 | return 1; // skip id |
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65 | } |
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66 | |||
67 | static const struct { |
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68 | const char *from; |
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69 | const char *arg; |
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70 | int (*func)(AVBPrint *dst, const char *in, const char *arg); |
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71 | } ass_codes_map[] = { |
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72 | {"\\~", "~", insert_text}, // tilde doesn't need escaping |
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73 | {"~", "{\\h}", insert_text}, // hard space |
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74 | {"\\n", "\\N", insert_text}, // newline |
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75 | {"\\D", "%d %b %Y", insert_datetime}, // current date |
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76 | {"\\T", "%H:%M", insert_datetime}, // current time |
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77 | {"\\N", "{\\r}", insert_text}, // reset to default style |
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78 | {"\\I", "{\\i1}", insert_text}, // italic on |
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79 | {"\\i", "{\\i0}", insert_text}, // italic off |
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80 | {"\\B", "{\\b1}", insert_text}, // bold on |
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81 | {"\\b", "{\\b0}", insert_text}, // bold off |
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82 | {"\\U", "{\\u1}", insert_text}, // underline on |
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83 | {"\\u", "{\\u0}", insert_text}, // underline off |
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84 | {"\\C", "", insert_color}, // TODO: color |
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85 | {"\\F", "", insert_font}, // TODO: font |
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86 | }; |
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87 | |||
88 | enum { |
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89 | ALIGN_VB = 1<<0, // vertical bottom, default |
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90 | ALIGN_VM = 1<<1, // vertical middle |
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91 | ALIGN_VT = 1<<2, // vertical top |
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92 | ALIGN_JC = 1<<3, // justify center, default |
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93 | ALIGN_JL = 1<<4, // justify left |
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94 | ALIGN_JR = 1<<5, // justify right |
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95 | }; |
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96 | |||
97 | static void jacosub_to_ass(AVCodecContext *avctx, AVBPrint *dst, const char *src) |
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98 | { |
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99 | int i, valign = 0, halign = 0; |
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100 | char c = av_toupper(*src); |
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101 | char directives[128] = {0}; |
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102 | |||
103 | /* extract the optional directives */ |
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104 | if ((c >= 'A' && c <= 'Z') || c == '[') { |
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105 | char *p = directives; |
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106 | char *pend = directives + sizeof(directives) - 1; |
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107 | |||
108 | do *p++ = av_toupper(*src++); |
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109 | while (*src && !jss_whitespace(*src) && p < pend); |
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110 | *p = 0; |
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111 | src = jss_skip_whitespace(src); |
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112 | } |
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113 | |||
114 | /* handle directives (TODO: handle more of them, and more reliably) */ |
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115 | if (strstr(directives, "VB")) valign = ALIGN_VB; |
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116 | else if (strstr(directives, "VM")) valign = ALIGN_VM; |
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117 | else if (strstr(directives, "VT")) valign = ALIGN_VT; |
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118 | if (strstr(directives, "JC")) halign = ALIGN_JC; |
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119 | else if (strstr(directives, "JL")) halign = ALIGN_JL; |
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120 | else if (strstr(directives, "JR")) halign = ALIGN_JR; |
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121 | if (valign || halign) { |
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122 | if (!valign) valign = ALIGN_VB; |
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123 | if (!halign) halign = ALIGN_JC; |
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124 | switch (valign | halign) { |
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125 | case ALIGN_VB | ALIGN_JL: av_bprintf(dst, "{\\an1}"); break; // bottom left |
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126 | case ALIGN_VB | ALIGN_JC: av_bprintf(dst, "{\\an2}"); break; // bottom center |
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127 | case ALIGN_VB | ALIGN_JR: av_bprintf(dst, "{\\an3}"); break; // bottom right |
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128 | case ALIGN_VM | ALIGN_JL: av_bprintf(dst, "{\\an4}"); break; // middle left |
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129 | case ALIGN_VM | ALIGN_JC: av_bprintf(dst, "{\\an5}"); break; // middle center |
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130 | case ALIGN_VM | ALIGN_JR: av_bprintf(dst, "{\\an6}"); break; // middle right |
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131 | case ALIGN_VT | ALIGN_JL: av_bprintf(dst, "{\\an7}"); break; // top left |
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132 | case ALIGN_VT | ALIGN_JC: av_bprintf(dst, "{\\an8}"); break; // top center |
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133 | case ALIGN_VT | ALIGN_JR: av_bprintf(dst, "{\\an9}"); break; // top right |
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134 | } |
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135 | } |
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136 | |||
137 | /* process timed line */ |
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138 | while (*src && *src != '\n') { |
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139 | |||
140 | /* text continue on the next line */ |
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141 | if (src[0] == '\\' && src[1] == '\n') { |
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142 | src += 2; |
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143 | while (jss_whitespace(*src)) |
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144 | src++; |
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145 | continue; |
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146 | } |
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147 | |||
148 | /* special character codes */ |
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149 | for (i = 0; i < FF_ARRAY_ELEMS(ass_codes_map); i++) { |
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150 | const char *from = ass_codes_map[i].from; |
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151 | const char *arg = ass_codes_map[i].arg; |
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152 | size_t codemap_len = strlen(from); |
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153 | |||
154 | if (!strncmp(src, from, codemap_len)) { |
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155 | src += codemap_len; |
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156 | src += ass_codes_map[i].func(dst, src, arg); |
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157 | break; |
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158 | } |
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159 | } |
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160 | |||
161 | /* simple char copy */ |
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162 | if (i == FF_ARRAY_ELEMS(ass_codes_map)) |
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163 | av_bprintf(dst, "%c", *src++); |
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164 | } |
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165 | av_bprintf(dst, "\r\n"); |
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166 | } |
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167 | |||
168 | static int jacosub_decode_frame(AVCodecContext *avctx, |
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169 | void *data, int *got_sub_ptr, AVPacket *avpkt) |
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170 | { |
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171 | AVSubtitle *sub = data; |
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172 | const char *ptr = avpkt->data; |
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173 | |||
174 | if (avpkt->size <= 0) |
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175 | goto end; |
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176 | |||
177 | if (*ptr) { |
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178 | AVBPrint buffer; |
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179 | char *dec_sub; |
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180 | |||
181 | // skip timers |
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182 | ptr = jss_skip_whitespace(ptr); |
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183 | ptr = strchr(ptr, ' '); if (!ptr) goto end; ptr++; |
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184 | ptr = strchr(ptr, ' '); if (!ptr) goto end; ptr++; |
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185 | |||
186 | av_bprint_init(&buffer, JSS_MAX_LINESIZE, JSS_MAX_LINESIZE); |
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187 | jacosub_to_ass(avctx, &buffer, ptr); |
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188 | av_bprint_finalize(&buffer, &dec_sub); |
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189 | ff_ass_add_rect(sub, dec_sub, avpkt->pts, avpkt->duration, 0); |
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190 | av_free(dec_sub); |
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191 | } |
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192 | |||
193 | end: |
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194 | *got_sub_ptr = sub->num_rects > 0; |
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195 | return avpkt->size; |
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196 | } |
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197 | |||
198 | AVCodec ff_jacosub_decoder = { |
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199 | .name = "jacosub", |
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200 | .long_name = NULL_IF_CONFIG_SMALL("JACOsub subtitle"), |
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201 | .type = AVMEDIA_TYPE_SUBTITLE, |
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202 | .id = AV_CODEC_ID_JACOSUB, |
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203 | .init = ff_ass_subtitle_header_default, |
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204 | .decode = jacosub_decode_frame, |
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205 | };=>>>=>5,><5,>4,><4,>3,><3,>2,><2,>1,><1,>0,><0,> |