1 | <?php |
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2 | ///////////////////////////////////////////////////////////////// |
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3 | /// getID3() by James Heinrich <info@getid3.org> // |
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4 | // available at http://getid3.sourceforge.net // |
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5 | // or http://www.getid3.org // |
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6 | ///////////////////////////////////////////////////////////////// |
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7 | // See readme.txt for more details // |
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8 | ///////////////////////////////////////////////////////////////// |
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9 | // // |
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10 | // module.audio.voc.php // |
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11 | // module for analyzing Creative VOC Audio files // |
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12 | // dependencies: NONE // |
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13 | // /// |
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14 | ///////////////////////////////////////////////////////////////// |
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15 | |
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16 | |
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17 | class getid3_voc |
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18 | { |
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19 | |
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20 | function getid3_voc(&$fd, &$ThisFileInfo) { |
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21 | |
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22 | $OriginalAVdataOffset = $ThisFileInfo['avdataoffset']; |
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23 | fseek($fd, $ThisFileInfo['avdataoffset'], SEEK_SET); |
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24 | $VOCheader = fread($fd, 26); |
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25 | |
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26 | if (substr($VOCheader, 0, 19) != 'Creative Voice File') { |
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27 | $ThisFileInfo['error'][] = 'Expecting "Creative Voice File" at offset '.$ThisFileInfo['avdataoffset'].', found "'.substr($VOCheader, 0, 19).'"'; |
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28 | return false; |
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29 | } |
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30 | |
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31 | // shortcuts |
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32 | $thisfile_audio = &$ThisFileInfo['audio']; |
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33 | $ThisFileInfo['voc'] = array(); |
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34 | $thisfile_voc = &$ThisFileInfo['voc']; |
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35 | |
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36 | $ThisFileInfo['fileformat'] = 'voc'; |
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37 | $thisfile_audio['dataformat'] = 'voc'; |
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38 | $thisfile_audio['bitrate_mode'] = 'cbr'; |
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39 | $thisfile_audio['lossless'] = true; |
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40 | $thisfile_audio['channels'] = 1; // might be overriden below |
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41 | $thisfile_audio['bits_per_sample'] = 8; // might be overriden below |
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42 | |
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43 | // byte # Description |
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44 | // ------ ------------------------------------------ |
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45 | // 00-12 'Creative Voice File' |
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46 | // 13 1A (eof to abort printing of file) |
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47 | // 14-15 Offset of first datablock in .voc file (std 1A 00 in Intel Notation) |
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48 | // 16-17 Version number (minor,major) (VOC-HDR puts 0A 01) |
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49 | // 18-19 2's Comp of Ver. # + 1234h (VOC-HDR puts 29 11) |
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50 | |
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51 | $thisfile_voc['header']['datablock_offset'] = getid3_lib::LittleEndian2Int(substr($VOCheader, 20, 2)); |
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52 | $thisfile_voc['header']['minor_version'] = getid3_lib::LittleEndian2Int(substr($VOCheader, 22, 1)); |
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53 | $thisfile_voc['header']['major_version'] = getid3_lib::LittleEndian2Int(substr($VOCheader, 23, 1)); |
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54 | |
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55 | do { |
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56 | |
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57 | $BlockOffset = ftell($fd); |
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58 | $BlockData = fread($fd, 4); |
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59 | $BlockType = ord($BlockData{0}); |
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60 | $BlockSize = getid3_lib::LittleEndian2Int(substr($BlockData, 1, 3)); |
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61 | $ThisBlock = array(); |
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62 | |
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63 | @$thisfile_voc['blocktypes'][$BlockType]++; |
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64 | switch ($BlockType) { |
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65 | case 0: // Terminator |
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66 | // do nothing, we'll break out of the loop down below |
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67 | break; |
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68 | |
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69 | case 1: // Sound data |
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70 | $BlockData .= fread($fd, 2); |
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71 | if ($ThisFileInfo['avdataoffset'] <= $OriginalAVdataOffset) { |
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72 | $ThisFileInfo['avdataoffset'] = ftell($fd); |
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73 | } |
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74 | fseek($fd, $BlockSize - 2, SEEK_CUR); |
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75 | |
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76 | $ThisBlock['sample_rate_id'] = getid3_lib::LittleEndian2Int(substr($BlockData, 4, 1)); |
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77 | $ThisBlock['compression_type'] = getid3_lib::LittleEndian2Int(substr($BlockData, 5, 1)); |
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78 | |
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79 | $ThisBlock['compression_name'] = $this->VOCcompressionTypeLookup($ThisBlock['compression_type']); |
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80 | if ($ThisBlock['compression_type'] <= 3) { |
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81 | $thisfile_voc['compressed_bits_per_sample'] = getid3_lib::CastAsInt(str_replace('-bit', '', $ThisBlock['compression_name'])); |
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82 | } |
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83 | |
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84 | // Less accurate sample_rate calculation than the Extended block (#8) data (but better than nothing if Extended Block is not available) |
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85 | if (empty($thisfile_audio['sample_rate'])) { |
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86 | // SR byte = 256 - (1000000 / sample_rate) |
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87 | $thisfile_audio['sample_rate'] = getid3_lib::trunc((1000000 / (256 - $ThisBlock['sample_rate_id'])) / $thisfile_audio['channels']); |
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88 | } |
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89 | break; |
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90 | |
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91 | case 2: // Sound continue |
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92 | case 3: // Silence |
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93 | case 4: // Marker |
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94 | case 6: // Repeat |
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95 | case 7: // End repeat |
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96 | // nothing useful, just skip |
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97 | fseek($fd, $BlockSize, SEEK_CUR); |
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98 | break; |
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99 | |
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100 | case 8: // Extended |
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101 | $BlockData .= fread($fd, 4); |
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102 | |
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103 | //00-01 Time Constant: |
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104 | // Mono: 65536 - (256000000 / sample_rate) |
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105 | // Stereo: 65536 - (256000000 / (sample_rate * 2)) |
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106 | $ThisBlock['time_constant'] = getid3_lib::LittleEndian2Int(substr($BlockData, 4, 2)); |
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107 | $ThisBlock['pack_method'] = getid3_lib::LittleEndian2Int(substr($BlockData, 6, 1)); |
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108 | $ThisBlock['stereo'] = (bool) getid3_lib::LittleEndian2Int(substr($BlockData, 7, 1)); |
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109 | |
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110 | $thisfile_audio['channels'] = ($ThisBlock['stereo'] ? 2 : 1); |
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111 | $thisfile_audio['sample_rate'] = getid3_lib::trunc((256000000 / (65536 - $ThisBlock['time_constant'])) / $thisfile_audio['channels']); |
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112 | break; |
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113 | |
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114 | case 9: // data block that supersedes blocks 1 and 8. Used for stereo, 16 bit |
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115 | $BlockData .= fread($fd, 12); |
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116 | if ($ThisFileInfo['avdataoffset'] <= $OriginalAVdataOffset) { |
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117 | $ThisFileInfo['avdataoffset'] = ftell($fd); |
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118 | } |
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119 | fseek($fd, $BlockSize - 12, SEEK_CUR); |
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120 | |
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121 | $ThisBlock['sample_rate'] = getid3_lib::LittleEndian2Int(substr($BlockData, 4, 4)); |
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122 | $ThisBlock['bits_per_sample'] = getid3_lib::LittleEndian2Int(substr($BlockData, 8, 1)); |
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123 | $ThisBlock['channels'] = getid3_lib::LittleEndian2Int(substr($BlockData, 9, 1)); |
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124 | $ThisBlock['wFormat'] = getid3_lib::LittleEndian2Int(substr($BlockData, 10, 2)); |
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125 | |
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126 | $ThisBlock['compression_name'] = $this->VOCwFormatLookup($ThisBlock['wFormat']); |
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127 | if ($this->VOCwFormatActualBitsPerSampleLookup($ThisBlock['wFormat'])) { |
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128 | $thisfile_voc['compressed_bits_per_sample'] = $this->VOCwFormatActualBitsPerSampleLookup($ThisBlock['wFormat']); |
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129 | } |
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130 | |
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131 | $thisfile_audio['sample_rate'] = $ThisBlock['sample_rate']; |
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132 | $thisfile_audio['bits_per_sample'] = $ThisBlock['bits_per_sample']; |
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133 | $thisfile_audio['channels'] = $ThisBlock['channels']; |
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134 | break; |
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135 | |
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136 | default: |
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137 | $ThisFileInfo['warning'][] = 'Unhandled block type "'.$BlockType.'" at offset '.$BlockOffset; |
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138 | fseek($fd, $BlockSize, SEEK_CUR); |
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139 | break; |
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140 | } |
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141 | |
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142 | if (!empty($ThisBlock)) { |
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143 | $ThisBlock['block_offset'] = $BlockOffset; |
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144 | $ThisBlock['block_size'] = $BlockSize; |
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145 | $ThisBlock['block_type_id'] = $BlockType; |
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146 | $thisfile_voc['blocks'][] = $ThisBlock; |
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147 | } |
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148 | |
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149 | } while (!feof($fd) && ($BlockType != 0)); |
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150 | |
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151 | // Terminator block doesn't have size field, so seek back 3 spaces |
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152 | fseek($fd, -3, SEEK_CUR); |
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153 | |
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154 | ksort($thisfile_voc['blocktypes']); |
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155 | |
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156 | if (!empty($thisfile_voc['compressed_bits_per_sample'])) { |
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157 | $ThisFileInfo['playtime_seconds'] = (($ThisFileInfo['avdataend'] - $ThisFileInfo['avdataoffset']) * 8) / ($thisfile_voc['compressed_bits_per_sample'] * $thisfile_audio['channels'] * $thisfile_audio['sample_rate']); |
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158 | $thisfile_audio['bitrate'] = (($ThisFileInfo['avdataend'] - $ThisFileInfo['avdataoffset']) * 8) / $ThisFileInfo['playtime_seconds']; |
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159 | } |
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160 | |
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161 | return true; |
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162 | } |
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163 | |
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164 | function VOCcompressionTypeLookup($index) { |
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165 | static $VOCcompressionTypeLookup = array( |
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166 | 0 => '8-bit', |
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167 | 1 => '4-bit', |
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168 | 2 => '2.6-bit', |
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169 | 3 => '2-bit' |
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170 | ); |
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171 | return (isset($VOCcompressionTypeLookup[$index]) ? $VOCcompressionTypeLookup[$index] : 'Multi DAC ('.($index - 3).') channels'); |
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172 | } |
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173 | |
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174 | function VOCwFormatLookup($index) { |
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175 | static $VOCwFormatLookup = array( |
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176 | 0x0000 => '8-bit unsigned PCM', |
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177 | 0x0001 => 'Creative 8-bit to 4-bit ADPCM', |
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178 | 0x0002 => 'Creative 8-bit to 3-bit ADPCM', |
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179 | 0x0003 => 'Creative 8-bit to 2-bit ADPCM', |
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180 | 0x0004 => '16-bit signed PCM', |
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181 | 0x0006 => 'CCITT a-Law', |
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182 | 0x0007 => 'CCITT u-Law', |
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183 | 0x2000 => 'Creative 16-bit to 4-bit ADPCM' |
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184 | ); |
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185 | return (isset($VOCwFormatLookup[$index]) ? $VOCwFormatLookup[$index] : false); |
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186 | } |
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187 | |
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188 | function VOCwFormatActualBitsPerSampleLookup($index) { |
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189 | static $VOCwFormatLookup = array( |
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190 | 0x0000 => 8, |
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191 | 0x0001 => 4, |
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192 | 0x0002 => 3, |
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193 | 0x0003 => 2, |
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194 | 0x0004 => 16, |
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195 | 0x0006 => 8, |
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196 | 0x0007 => 8, |
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197 | 0x2000 => 4 |
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198 | ); |
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199 | return (isset($VOCwFormatLookup[$index]) ? $VOCwFormatLookup[$index] : false); |
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200 | } |
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201 | |
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202 | } |
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203 | |
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204 | |
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205 | ?> |
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