[3318] | 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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