1 | <?php |
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2 | // +----------------------------------------------------------------------+ |
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3 | // | PHP version 5 | |
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4 | // +----------------------------------------------------------------------+ |
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5 | // | Copyright (c) 2002-2006 James Heinrich, Allan Hansen | |
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6 | // +----------------------------------------------------------------------+ |
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7 | // | This source file is subject to version 2 of the GPL license, | |
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8 | // | that is bundled with this package in the file license.txt and is | |
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9 | // | available through the world-wide-web at the following url: | |
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10 | // | http://www.gnu.org/copyleft/gpl.html | |
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11 | // +----------------------------------------------------------------------+ |
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12 | // | getID3() - http://getid3.sourceforge.net or http://www.getid3.org | |
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13 | // +----------------------------------------------------------------------+ |
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14 | // | Authors: James Heinrich <infoØgetid3*org> | |
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15 | // | Allan Hansen <ahØartemis*dk> | |
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16 | // +----------------------------------------------------------------------+ |
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17 | // | module.audio.voc.php | |
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18 | // | Module for analyzing Creative VOC Audio files. | |
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19 | // | dependencies: NONE | |
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20 | // +----------------------------------------------------------------------+ |
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21 | // |
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22 | // $Id: module.audio.voc.php 3318 2009-05-20 21:54:10Z vdigital $ |
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23 | |
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24 | |
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25 | |
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26 | class getid3_voc extends getid3_handler |
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27 | { |
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28 | |
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29 | public function Analyze() { |
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30 | |
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31 | $getid3 = $this->getid3; |
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32 | |
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33 | $original_av_data_offset = $getid3->info['avdataoffset']; |
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34 | |
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35 | fseek($getid3->fp, $getid3->info['avdataoffset'], SEEK_SET); |
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36 | $voc_header= fread($getid3->fp, 26); |
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37 | |
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38 | // Magic bytes: 'Creative Voice File' |
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39 | |
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40 | $info_audio = &$getid3->info['audio']; |
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41 | $getid3->info['voc'] = array (); |
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42 | $info_voc = &$getid3->info['voc']; |
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43 | |
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44 | $getid3->info['fileformat'] = 'voc'; |
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45 | $info_audio['dataformat'] = 'voc'; |
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46 | $info_audio['bitrate_mode'] = 'cbr'; |
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47 | $info_audio['lossless'] = true; |
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48 | $info_audio['channels'] = 1; // might be overriden below |
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49 | $info_audio['bits_per_sample'] = 8; // might be overriden below |
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50 | |
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51 | // byte # Description |
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52 | // ------ ------------------------------------------ |
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53 | // 00-12 'Creative Voice File' |
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54 | // 13 1A (eof to abort printing of file) |
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55 | // 14-15 Offset of first datablock in .voc file (std 1A 00 in Intel Notation) |
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56 | // 16-17 Version number (minor,major) (VOC-HDR puts 0A 01) |
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57 | // 18-19 2's Comp of Ver. # + 1234h (VOC-HDR puts 29 11) |
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58 | |
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59 | getid3_lib::ReadSequence('LittleEndian2Int', $info_voc['header'], $voc_header, 20, |
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60 | array ( |
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61 | 'datablock_offset' => 2, |
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62 | 'minor_version' => 1, |
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63 | 'major_version' => 1 |
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64 | ) |
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65 | ); |
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66 | |
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67 | do { |
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68 | $block_offset = ftell($getid3->fp); |
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69 | $block_data = fread($getid3->fp, 4); |
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70 | $block_type = ord($block_data{0}); |
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71 | $block_size = getid3_lib::LittleEndian2Int(substr($block_data, 1, 3)); |
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72 | $this_block = array (); |
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73 | |
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74 | @$info_voc['blocktypes'][$block_type]++; |
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75 | |
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76 | switch ($block_type) { |
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77 | |
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78 | case 0: // Terminator |
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79 | // do nothing, we'll break out of the loop down below |
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80 | break; |
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81 | |
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82 | case 1: // Sound data |
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83 | $block_data .= fread($getid3->fp, 2); |
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84 | if ($getid3->info['avdataoffset'] <= $original_av_data_offset) { |
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85 | $getid3->info['avdataoffset'] = ftell($getid3->fp); |
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86 | } |
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87 | fseek($getid3->fp, $block_size - 2, SEEK_CUR); |
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88 | |
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89 | getid3_lib::ReadSequence('LittleEndian2Int', $this_block, $block_data, 4, |
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90 | array ( |
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91 | 'sample_rate_id' => 1, |
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92 | 'compression_type' => 1 |
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93 | ) |
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94 | ); |
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95 | |
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96 | $this_block['compression_name'] = getid3_voc::VOCcompressionTypeLookup($this_block['compression_type']); |
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97 | if ($this_block['compression_type'] <= 3) { |
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98 | $info_voc['compressed_bits_per_sample'] = (int)(str_replace('-bit', '', $this_block['compression_name'])); |
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99 | } |
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100 | |
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101 | // Less accurate sample_rate calculation than the Extended block (#8) data (but better than nothing if Extended Block is not available) |
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102 | if (empty($info_audio['sample_rate'])) { |
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103 | // SR byte = 256 - (1000000 / sample_rate) |
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104 | $info_audio['sample_rate'] = (int)floor((1000000 / (256 - $this_block['sample_rate_id'])) / $info_audio['channels']); |
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105 | } |
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106 | break; |
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107 | |
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108 | case 2: // Sound continue |
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109 | case 3: // Silence |
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110 | case 4: // Marker |
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111 | case 6: // Repeat |
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112 | case 7: // End repeat |
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113 | // nothing useful, just skip |
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114 | fseek($getid3->fp, $block_size, SEEK_CUR); |
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115 | break; |
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116 | |
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117 | case 8: // Extended |
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118 | $block_data .= fread($getid3->fp, 4); |
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119 | |
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120 | //00-01 Time Constant: |
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121 | // Mono: 65536 - (256000000 / sample_rate) |
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122 | // Stereo: 65536 - (256000000 / (sample_rate * 2)) |
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123 | getid3_lib::ReadSequence('LittleEndian2Int', $this_block, $block_data, 4, |
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124 | array ( |
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125 | 'time_constant' => 2, |
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126 | 'pack_method' => 1, |
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127 | 'stereo' => 1 |
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128 | ) |
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129 | ); |
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130 | $this_block['stereo'] = (bool)$this_block['stereo']; |
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131 | |
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132 | $info_audio['channels'] = ($this_block['stereo'] ? 2 : 1); |
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133 | $info_audio['sample_rate'] = (int)floor((256000000 / (65536 - $this_block['time_constant'])) / $info_audio['channels']); |
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134 | break; |
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135 | |
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136 | case 9: // data block that supersedes blocks 1 and 8. Used for stereo, 16 bit |
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137 | $block_data .= fread($getid3->fp, 12); |
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138 | if ($getid3->info['avdataoffset'] <= $original_av_data_offset) { |
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139 | $getid3->info['avdataoffset'] = ftell($getid3->fp); |
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140 | } |
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141 | fseek($getid3->fp, $block_size - 12, SEEK_CUR); |
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142 | |
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143 | getid3_lib::ReadSequence('LittleEndian2Int', $this_block, $block_data, 4, |
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144 | array ( |
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145 | 'sample_rate' => 4, |
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146 | 'bits_per_sample' => 1, |
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147 | 'channels' => 1, |
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148 | 'wFormat' => 2 |
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149 | ) |
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150 | ); |
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151 | |
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152 | $this_block['compression_name'] = getid3_voc::VOCwFormatLookup($this_block['wFormat']); |
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153 | if (getid3_voc::VOCwFormatActualBitsPerSampleLookup($this_block['wFormat'])) { |
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154 | $info_voc['compressed_bits_per_sample'] = getid3_voc::VOCwFormatActualBitsPerSampleLookup($this_block['wFormat']); |
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155 | } |
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156 | |
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157 | $info_audio['sample_rate'] = $this_block['sample_rate']; |
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158 | $info_audio['bits_per_sample'] = $this_block['bits_per_sample']; |
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159 | $info_audio['channels'] = $this_block['channels']; |
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160 | break; |
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161 | |
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162 | default: |
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163 | $getid3->warning('Unhandled block type "'.$block_type.'" at offset '.$block_offset); |
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164 | fseek($getid3->fp, $block_size, SEEK_CUR); |
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165 | break; |
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166 | } |
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167 | |
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168 | if (!empty($this_block)) { |
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169 | $this_block['block_offset'] = $block_offset; |
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170 | $this_block['block_size'] = $block_size; |
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171 | $this_block['block_type_id'] = $block_type; |
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172 | $info_voc['blocks'][] = $this_block; |
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173 | } |
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174 | |
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175 | } while (!feof($getid3->fp) && ($block_type != 0)); |
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176 | |
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177 | // Terminator block doesn't have size field, so seek back 3 spaces |
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178 | fseek($getid3->fp, -3, SEEK_CUR); |
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179 | |
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180 | ksort($info_voc['blocktypes']); |
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181 | |
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182 | if (!empty($info_voc['compressed_bits_per_sample'])) { |
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183 | $getid3->info['playtime_seconds'] = (($getid3->info['avdataend'] - $getid3->info['avdataoffset']) * 8) / ($info_voc['compressed_bits_per_sample'] * $info_audio['channels'] * $info_audio['sample_rate']); |
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184 | $info_audio['bitrate'] = (($getid3->info['avdataend'] - $getid3->info['avdataoffset']) * 8) / $getid3->info['playtime_seconds']; |
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185 | } |
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186 | |
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187 | return true; |
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188 | } |
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189 | |
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190 | |
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191 | |
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192 | public static function VOCcompressionTypeLookup($index) { |
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193 | |
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194 | static $lookup = array ( |
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195 | 0 => '8-bit', |
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196 | 1 => '4-bit', |
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197 | 2 => '2.6-bit', |
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198 | 3 => '2-bit' |
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199 | ); |
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200 | return (isset($lookup[$index]) ? $lookup[$index] : 'Multi DAC ('.($index - 3).') channels'); |
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201 | } |
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202 | |
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203 | |
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204 | |
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205 | public static function VOCwFormatLookup($index) { |
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206 | |
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207 | static $lookup = array ( |
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208 | 0x0000 => '8-bit unsigned PCM', |
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209 | 0x0001 => 'Creative 8-bit to 4-bit ADPCM', |
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210 | 0x0002 => 'Creative 8-bit to 3-bit ADPCM', |
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211 | 0x0003 => 'Creative 8-bit to 2-bit ADPCM', |
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212 | 0x0004 => '16-bit signed PCM', |
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213 | 0x0006 => 'CCITT a-Law', |
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214 | 0x0007 => 'CCITT u-Law', |
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215 | 0x2000 => 'Creative 16-bit to 4-bit ADPCM' |
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216 | ); |
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217 | return (isset($lookup[$index]) ? $lookup[$index] : false); |
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218 | } |
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219 | |
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220 | |
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221 | |
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222 | public static function VOCwFormatActualBitsPerSampleLookup($index) { |
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223 | |
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224 | static $lookup = array ( |
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225 | 0x0000 => 8, |
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226 | 0x0001 => 4, |
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227 | 0x0002 => 3, |
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228 | 0x0003 => 2, |
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229 | 0x0004 => 16, |
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230 | 0x0006 => 8, |
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231 | 0x0007 => 8, |
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232 | 0x2000 => 4 |
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233 | ); |
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234 | return (isset($lookup[$index]) ? $lookup[$index] : false); |
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235 | } |
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236 | |
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237 | } |
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238 | |
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239 | |
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240 | ?> |
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