1 | //========================================================================= |
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2 | // FILENAME : tagutils-aac.c |
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3 | // DESCRIPTION : AAC metadata reader |
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4 | //========================================================================= |
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5 | // Copyright (c) 2008- NETGEAR, Inc. All Rights Reserved. |
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6 | //========================================================================= |
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7 | |
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8 | /* |
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9 | * This program is free software; you can redistribute it and/or modify |
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10 | * it under the terms of the GNU General Public License as published by |
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11 | * the Free Software Foundation; either version 2 of the License, or |
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12 | * (at your option) any later version. |
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13 | * |
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14 | * This program is distributed in the hope that it will be useful, |
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15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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17 | * GNU General Public License for more details. |
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18 | * |
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19 | * You should have received a copy of the GNU General Public License |
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20 | * along with this program. If not, see <http://www.gnu.org/licenses/>. |
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21 | */ |
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22 | |
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23 | /* |
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24 | * This file is derived from mt-daap project. |
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25 | */ |
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26 | |
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27 | // _mac_to_unix_time |
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28 | static time_t |
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29 | _mac_to_unix_time(int t) |
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30 | { |
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31 | struct timeval tv; |
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32 | struct timezone tz; |
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33 | |
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34 | gettimeofday(&tv, &tz); |
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35 | |
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36 | return (t - (365L * 66L * 24L * 60L * 60L + 17L * 60L * 60L * 24L) + |
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37 | (tz.tz_minuteswest * 60)); |
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38 | } |
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39 | |
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40 | |
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41 | |
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42 | // _aac_findatom: |
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43 | static long |
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44 | _aac_findatom(FILE *fin, long max_offset, char *which_atom, int *atom_size) |
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45 | { |
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46 | long current_offset = 0; |
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47 | int size; |
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48 | char atom[4]; |
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49 | |
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50 | while(current_offset < max_offset) |
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51 | { |
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52 | if(fread((void*)&size, 1, sizeof(int), fin) != sizeof(int)) |
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53 | return -1; |
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54 | |
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55 | size = ntohl(size); |
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56 | |
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57 | if(size <= 7) |
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58 | return -1; |
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59 | |
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60 | if(fread(atom, 1, 4, fin) != 4) |
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61 | return -1; |
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62 | |
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63 | if(strncasecmp(atom, which_atom, 4) == 0) |
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64 | { |
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65 | *atom_size = size; |
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66 | return current_offset; |
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67 | } |
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68 | |
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69 | fseek(fin, size - 8, SEEK_CUR); |
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70 | current_offset += size; |
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71 | } |
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72 | |
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73 | return -1; |
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74 | } |
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75 | |
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76 | // _get_aactags |
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77 | static int |
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78 | _get_aactags(char *file, struct song_metadata *psong) |
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79 | { |
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80 | FILE *fin; |
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81 | long atom_offset; |
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82 | unsigned int atom_length; |
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83 | |
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84 | long current_offset = 0; |
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85 | int current_size; |
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86 | char current_atom[4]; |
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87 | char *current_data; |
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88 | int genre; |
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89 | int len; |
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90 | |
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91 | if(!(fin = fopen(file, "rb"))) |
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92 | { |
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93 | DPRINTF(E_ERROR, L_SCANNER, "Cannot open file %s for reading\n", file); |
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94 | return -1; |
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95 | } |
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96 | |
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97 | fseek(fin, 0, SEEK_SET); |
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98 | |
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99 | atom_offset = _aac_lookforatom(fin, "moov:udta:meta:ilst", &atom_length); |
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100 | if(atom_offset != -1) |
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101 | { |
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102 | while(current_offset < atom_length) |
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103 | { |
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104 | if(fread((void*)¤t_size, 1, sizeof(int), fin) != sizeof(int)) |
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105 | break; |
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106 | |
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107 | current_size = ntohl(current_size); |
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108 | |
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109 | if(current_size <= 7 || current_size > 1<<24) // something not right |
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110 | break; |
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111 | |
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112 | if(fread(current_atom, 1, 4, fin) != 4) |
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113 | break; |
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114 | |
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115 | len = current_size - 7; // too short |
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116 | if(len < 22) |
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117 | len = 22; |
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118 | |
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119 | current_data = (char*)malloc(len); // extra byte |
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120 | memset(current_data, 0x00, len); |
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121 | |
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122 | if(fread(current_data, 1, current_size - 8, fin) != current_size - 8) |
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123 | break; |
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124 | |
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125 | if(!memcmp(current_atom, "\xA9" "nam", 4)) |
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126 | psong->title = strdup((char*)¤t_data[16]); |
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127 | else if(!memcmp(current_atom, "\xA9" "ART", 4) || |
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128 | !memcmp(current_atom, "\xA9" "art", 4)) |
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129 | psong->contributor[ROLE_ARTIST] = strdup((char*)¤t_data[16]); |
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130 | else if(!memcmp(current_atom, "\xA9" "alb", 4)) |
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131 | psong->album = strdup((char*)¤t_data[16]); |
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132 | else if(!memcmp(current_atom, "\xA9" "cmt", 4)) |
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133 | psong->comment = strdup((char*)¤t_data[16]); |
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134 | else if(!memcmp(current_atom, "\xA9" "dir", 4)) |
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135 | psong->contributor[ROLE_CONDUCTOR] = strdup((char*)¤t_data[16]); |
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136 | else if(!memcmp(current_atom, "\xA9" "wrt", 4)) |
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137 | psong->contributor[ROLE_COMPOSER] = strdup((char*)¤t_data[16]); |
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138 | else if(!memcmp(current_atom, "\xA9" "grp", 4)) |
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139 | psong->grouping = strdup((char*)¤t_data[16]); |
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140 | else if(!memcmp(current_atom, "\xA9" "gen", 4)) |
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141 | psong->genre = strdup((char*)¤t_data[16]); |
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142 | else if(!memcmp(current_atom, "\xA9" "day", 4)) |
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143 | psong->year = atoi((char*)¤t_data[16]); |
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144 | else if(!memcmp(current_atom, "tmpo", 4)) |
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145 | psong->bpm = (current_data[16] << 8) | current_data[17]; |
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146 | else if(!memcmp(current_atom, "trkn", 4)) |
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147 | { |
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148 | psong->track = (current_data[18] << 8) | current_data[19]; |
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149 | psong->total_tracks = (current_data[20] << 8) | current_data[21]; |
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150 | } |
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151 | else if(!memcmp(current_atom, "disk", 4)) |
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152 | { |
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153 | psong->disc = (current_data[18] << 8) | current_data[19]; |
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154 | psong->total_discs = (current_data[20] << 8) | current_data[21]; |
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155 | } |
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156 | else if(!memcmp(current_atom, "gnre", 4)) |
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157 | { |
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158 | genre = current_data[17] - 1; |
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159 | if((genre < 0) || (genre > WINAMP_GENRE_UNKNOWN)) |
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160 | genre = WINAMP_GENRE_UNKNOWN; |
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161 | psong->genre = strdup(winamp_genre[genre]); |
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162 | } |
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163 | else if(!memcmp(current_atom, "cpil", 4)) |
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164 | { |
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165 | psong->compilation = current_data[16]; |
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166 | } |
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167 | else if(!memcmp(current_atom, "covr", 4)) |
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168 | { |
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169 | psong->image_size = current_size - 8 - 16; |
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170 | if((psong->image = malloc(psong->image_size))) |
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171 | memcpy(psong->image, current_data+16, psong->image_size); |
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172 | else |
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173 | DPRINTF(E_ERROR, L_SCANNER, "Out of memory [%s]\n", file); |
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174 | } |
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175 | |
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176 | free(current_data); |
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177 | current_offset += current_size; |
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178 | } |
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179 | } |
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180 | |
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181 | fclose(fin); |
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182 | |
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183 | if(atom_offset == -1) |
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184 | return -1; |
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185 | |
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186 | return 0; |
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187 | } |
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188 | |
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189 | // aac_lookforatom |
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190 | static off_t |
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191 | _aac_lookforatom(FILE *aac_fp, char *atom_path, unsigned int *atom_length) |
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192 | { |
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193 | long atom_offset; |
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194 | off_t file_size; |
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195 | char *cur_p, *end_p; |
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196 | char atom_name[5]; |
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197 | |
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198 | fseek(aac_fp, 0, SEEK_END); |
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199 | file_size = ftell(aac_fp); |
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200 | rewind(aac_fp); |
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201 | |
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202 | end_p = atom_path; |
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203 | while(*end_p != '\0') |
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204 | { |
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205 | end_p++; |
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206 | } |
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207 | atom_name[4] = '\0'; |
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208 | cur_p = atom_path; |
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209 | |
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210 | while(cur_p) |
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211 | { |
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212 | if((end_p - cur_p) < 4) |
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213 | { |
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214 | return -1; |
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215 | } |
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216 | strncpy(atom_name, cur_p, 4); |
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217 | atom_offset = _aac_findatom(aac_fp, file_size, atom_name, (int*)atom_length); |
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218 | if(atom_offset == -1) |
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219 | { |
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220 | return -1; |
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221 | } |
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222 | cur_p = strchr(cur_p, ':'); |
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223 | if(cur_p != NULL) |
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224 | { |
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225 | cur_p++; |
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226 | |
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227 | if(!strcmp(atom_name, "meta")) |
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228 | { |
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229 | fseek(aac_fp, 4, SEEK_CUR); |
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230 | } |
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231 | else if(!strcmp(atom_name, "stsd")) |
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232 | { |
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233 | fseek(aac_fp, 8, SEEK_CUR); |
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234 | } |
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235 | else if(!strcmp(atom_name, "mp4a")) |
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236 | { |
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237 | fseek(aac_fp, 28, SEEK_CUR); |
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238 | } |
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239 | } |
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240 | } |
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241 | |
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242 | // return position of 'size:atom' |
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243 | return ftell(aac_fp) - 8; |
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244 | } |
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245 | |
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246 | int |
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247 | _aac_check_extended_descriptor(FILE *infile) |
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248 | { |
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249 | short int i; |
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250 | unsigned char buf[3]; |
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251 | |
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252 | if( !fread((void *)&buf, 3, 1, infile) ) |
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253 | return -1; |
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254 | for( i=0; i<3; i++ ) |
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255 | { |
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256 | if( (buf[i] != 0x80) && |
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257 | (buf[i] != 0x81) && |
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258 | (buf[i] != 0xFE) ) |
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259 | { |
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260 | fseek(infile, -3, SEEK_CUR); |
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261 | return 0; |
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262 | } |
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263 | } |
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264 | |
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265 | return 0; |
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266 | } |
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267 | |
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268 | // _get_aacfileinfo |
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269 | int |
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270 | _get_aacfileinfo(char *file, struct song_metadata *psong) |
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271 | { |
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272 | FILE *infile; |
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273 | long atom_offset; |
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274 | int atom_length; |
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275 | int sample_size; |
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276 | int samples; |
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277 | unsigned int bitrate; |
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278 | off_t file_size; |
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279 | int ms; |
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280 | unsigned char buffer[2]; |
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281 | int time = 0; |
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282 | aac_object_type_t profile_id = 0; |
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283 | |
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284 | psong->vbr_scale = -1; |
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285 | psong->channels = 2; // A "normal" default in case we can't find this information |
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286 | |
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287 | if(!(infile = fopen(file, "rb"))) |
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288 | { |
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289 | DPRINTF(E_ERROR, L_SCANNER, "Could not open %s for reading\n", file); |
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290 | return -1; |
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291 | } |
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292 | |
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293 | fseek(infile, 0, SEEK_END); |
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294 | file_size = ftell(infile); |
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295 | fseek(infile, 0, SEEK_SET); |
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296 | |
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297 | // move to 'mvhd' atom |
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298 | atom_offset = _aac_lookforatom(infile, "moov:mvhd", (unsigned int*)&atom_length); |
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299 | if(atom_offset != -1) |
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300 | { |
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301 | fseek(infile, 8, SEEK_CUR); |
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302 | fread((void *)&time, sizeof(int), 1, infile); |
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303 | time = ntohl(time); |
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304 | // slimserver prefer to use filesystem time |
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305 | //psong->time_modified = _mac_to_unix_time(time); |
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306 | fread((void*)&sample_size, 1, sizeof(int), infile); |
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307 | fread((void*)&samples, 1, sizeof(int), infile); |
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308 | |
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309 | sample_size = ntohl(sample_size); |
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310 | samples = ntohl(samples); |
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311 | |
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312 | // avoid overflowing on large sample_sizes (90000) |
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313 | ms = 1000; |
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314 | while((ms > 9) && (!(sample_size % 10))) |
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315 | { |
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316 | sample_size /= 10; |
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317 | ms /= 10; |
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318 | } |
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319 | |
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320 | // unit = ms |
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321 | psong->song_length = (int)((samples * ms) / sample_size); |
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322 | } |
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323 | |
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324 | psong->bitrate = 0; |
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325 | |
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326 | // see if it is aac or alac |
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327 | atom_offset = _aac_lookforatom(infile, "moov:trak:mdia:minf:stbl:stsd:alac", (unsigned int*)&atom_length); |
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328 | if(atom_offset != -1) { |
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329 | fseek(infile, atom_offset + 32, SEEK_SET); |
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330 | fread(buffer, sizeof(unsigned char), 2, infile); |
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331 | |
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332 | psong->samplerate = (buffer[0] << 8) | (buffer[1]); |
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333 | goto bad_esds; |
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334 | } |
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335 | |
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336 | // get samplerate from 'mp4a' (not from 'mdhd') |
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337 | atom_offset = _aac_lookforatom(infile, "moov:trak:mdia:minf:stbl:stsd:mp4a", (unsigned int*)&atom_length); |
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338 | if(atom_offset != -1) |
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339 | { |
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340 | fseek(infile, atom_offset + 32, SEEK_SET); |
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341 | fread(buffer, sizeof(unsigned char), 2, infile); |
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342 | |
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343 | psong->samplerate = (buffer[0] << 8) | (buffer[1]); |
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344 | |
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345 | fseek(infile, 2, SEEK_CUR); |
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346 | |
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347 | // get bitrate from 'esds' |
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348 | atom_offset = _aac_findatom(infile, atom_length - (ftell(infile) - atom_offset), "esds", &atom_length); |
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349 | |
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350 | if(atom_offset != -1) |
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351 | { |
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352 | // skip the version number |
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353 | fseek(infile, atom_offset + 4, SEEK_CUR); |
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354 | // should be 0x03, to signify the descriptor type (section) |
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355 | fread((void *)&buffer, 1, 1, infile); |
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356 | if( (buffer[0] != 0x03) || (_aac_check_extended_descriptor(infile) != 0) ) |
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357 | goto bad_esds; |
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358 | fseek(infile, 4, SEEK_CUR); |
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359 | fread((void *)&buffer, 1, 1, infile); |
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360 | if( (buffer[0] != 0x04) || (_aac_check_extended_descriptor(infile) != 0) ) |
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361 | goto bad_esds; |
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362 | fseek(infile, 10, SEEK_CUR); // 10 bytes into section 4 should be average bitrate. max bitrate is 6 bytes in. |
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363 | fread((void *)&bitrate, sizeof(unsigned int), 1, infile); |
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364 | psong->bitrate = ntohl(bitrate); |
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365 | fread((void *)&buffer, 1, 1, infile); |
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366 | if( (buffer[0] != 0x05) || (_aac_check_extended_descriptor(infile) != 0) ) |
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367 | goto bad_esds; |
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368 | fseek(infile, 1, SEEK_CUR); // 1 bytes into section 5 should be the setup data |
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369 | fread((void *)&buffer, 2, 1, infile); |
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370 | profile_id = (buffer[0] >> 3); // first 5 bits of setup data is the Audo Profile ID |
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371 | /* Frequency index: (((buffer[0] & 0x7) << 1) | (buffer[1] >> 7))) */ |
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372 | samples = ((buffer[1] >> 3) & 0xF); |
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373 | psong->channels = (samples == 7 ? 8 : samples); |
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374 | } |
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375 | } |
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376 | bad_esds: |
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377 | |
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378 | atom_offset = _aac_lookforatom(infile, "mdat", (unsigned int*)&atom_length); |
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379 | psong->audio_size = atom_length - 8; |
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380 | psong->audio_offset = atom_offset; |
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381 | |
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382 | if(!psong->bitrate) |
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383 | { |
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384 | /* Dont' scare people with this for now. Could be Apple Lossless? |
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385 | DPRINTF(E_DEBUG, L_SCANNER, "No 'esds' atom. Guess bitrate. [%s]\n", basename(file)); */ |
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386 | if((atom_offset != -1) && (psong->song_length)) |
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387 | { |
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388 | psong->bitrate = atom_length * 1000 / psong->song_length / 128; |
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389 | } |
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390 | /* If this is an obviously wrong bitrate, try something different */ |
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391 | if((psong->bitrate < 16000) && (psong->song_length > 1000)) |
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392 | { |
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393 | psong->bitrate = (file_size * 8) / (psong->song_length / 1000); |
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394 | } |
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395 | } |
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396 | |
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397 | //DPRINTF(E_DEBUG, L_METADATA, "Profile ID: %u\n", profile_id); |
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398 | switch( profile_id ) |
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399 | { |
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400 | case AAC_LC: |
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401 | case AAC_LC_ER: |
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402 | if( psong->samplerate < 8000 || psong->samplerate > 48000 ) |
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403 | { |
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404 | DPRINTF(E_DEBUG, L_METADATA, "Unsupported AAC: sample rate is not 8000 < %d < 48000\n", |
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405 | psong->samplerate); |
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406 | break; |
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407 | } |
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408 | /* AAC @ Level 1/2 */ |
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409 | if( psong->channels <= 2 && psong->bitrate <= 320000 ) |
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410 | asprintf(&(psong->dlna_pn), "AAC_ISO_320"); |
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411 | else if( psong->channels <= 2 && psong->bitrate <= 576000 ) |
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412 | asprintf(&(psong->dlna_pn), "AAC_ISO"); |
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413 | else if( psong->channels <= 6 && psong->bitrate <= 1440000 ) |
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414 | asprintf(&(psong->dlna_pn), "AAC_MULT5_ISO"); |
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415 | else |
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416 | DPRINTF(E_DEBUG, L_METADATA, "Unhandled AAC: %d channels, %d bitrate\n", |
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417 | psong->channels, psong->bitrate); |
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418 | break; |
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419 | default: |
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420 | DPRINTF(E_DEBUG, L_METADATA, "Unhandled AAC type %d [%s]\n", profile_id, basename(file)); |
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421 | break; |
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422 | } |
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423 | |
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424 | fclose(infile); |
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425 | return 0; |
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426 | } |
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