221 lines
8.9 KiB
PHP
221 lines
8.9 KiB
PHP
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<?php
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/////////////////////////////////////////////////////////////////
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/// getID3() by James Heinrich <info@getid3.org> //
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// available at http://getid3.sourceforge.net //
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// or http://www.getid3.org //
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/////////////////////////////////////////////////////////////////
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// See readme.txt for more details //
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/////////////////////////////////////////////////////////////////
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// //
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// module.audio.la.php //
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// module for analyzing BONK audio files //
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// dependencies: module.tag.id3v2.php (optional) //
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// ///
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/////////////////////////////////////////////////////////////////
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class getid3_bonk
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{
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function getid3_bonk(&$fd, &$ThisFileInfo) {
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// shortcut
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$ThisFileInfo['bonk'] = array();
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$thisfile_bonk = &$ThisFileInfo['bonk'];
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$thisfile_bonk['dataoffset'] = $ThisFileInfo['avdataoffset'];
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$thisfile_bonk['dataend'] = $ThisFileInfo['avdataend'];
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if ($thisfile_bonk['dataend'] >= pow(2, 31)) {
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$ThisFileInfo['warning'][] = 'Unable to parse BONK file from end (v0.6+ preferred method) because PHP filesystem functions only support up to 2GB';
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} else {
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// scan-from-end method, for v0.6 and higher
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fseek($fd, $thisfile_bonk['dataend'] - 8, SEEK_SET);
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$PossibleBonkTag = fread($fd, 8);
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while ($this->BonkIsValidTagName(substr($PossibleBonkTag, 4, 4), true)) {
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$BonkTagSize = getid3_lib::LittleEndian2Int(substr($PossibleBonkTag, 0, 4));
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fseek($fd, 0 - $BonkTagSize, SEEK_CUR);
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$BonkTagOffset = ftell($fd);
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$TagHeaderTest = fread($fd, 5);
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if (($TagHeaderTest{0} != "\x00") || (substr($PossibleBonkTag, 4, 4) != strtolower(substr($PossibleBonkTag, 4, 4)))) {
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$ThisFileInfo['error'][] = 'Expecting "<22>'.strtoupper(substr($PossibleBonkTag, 4, 4)).'" at offset '.$BonkTagOffset.', found "'.$TagHeaderTest.'"';
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return false;
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}
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$BonkTagName = substr($TagHeaderTest, 1, 4);
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$thisfile_bonk[$BonkTagName]['size'] = $BonkTagSize;
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$thisfile_bonk[$BonkTagName]['offset'] = $BonkTagOffset;
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$this->HandleBonkTags($fd, $BonkTagName, $ThisFileInfo);
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$NextTagEndOffset = $BonkTagOffset - 8;
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if ($NextTagEndOffset < $thisfile_bonk['dataoffset']) {
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if (empty($ThisFileInfo['audio']['encoder'])) {
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$ThisFileInfo['audio']['encoder'] = 'Extended BONK v0.9+';
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}
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return true;
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}
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fseek($fd, $NextTagEndOffset, SEEK_SET);
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$PossibleBonkTag = fread($fd, 8);
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}
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}
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// seek-from-beginning method for v0.4 and v0.5
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if (empty($thisfile_bonk['BONK'])) {
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fseek($fd, $thisfile_bonk['dataoffset'], SEEK_SET);
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do {
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$TagHeaderTest = fread($fd, 5);
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switch ($TagHeaderTest) {
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case "\x00".'BONK':
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if (empty($ThisFileInfo['audio']['encoder'])) {
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$ThisFileInfo['audio']['encoder'] = 'BONK v0.4';
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}
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break;
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case "\x00".'INFO':
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$ThisFileInfo['audio']['encoder'] = 'Extended BONK v0.5';
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break;
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default:
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break 2;
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}
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$BonkTagName = substr($TagHeaderTest, 1, 4);
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$thisfile_bonk[$BonkTagName]['size'] = $thisfile_bonk['dataend'] - $thisfile_bonk['dataoffset'];
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$thisfile_bonk[$BonkTagName]['offset'] = $thisfile_bonk['dataoffset'];
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$this->HandleBonkTags($fd, $BonkTagName, $ThisFileInfo);
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} while (true);
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}
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// parse META block for v0.6 - v0.8
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if (empty($thisfile_bonk['INFO']) && isset($thisfile_bonk['META']['tags']['info'])) {
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fseek($fd, $thisfile_bonk['META']['tags']['info'], SEEK_SET);
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$TagHeaderTest = fread($fd, 5);
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if ($TagHeaderTest == "\x00".'INFO') {
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$ThisFileInfo['audio']['encoder'] = 'Extended BONK v0.6 - v0.8';
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$BonkTagName = substr($TagHeaderTest, 1, 4);
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$thisfile_bonk[$BonkTagName]['size'] = $thisfile_bonk['dataend'] - $thisfile_bonk['dataoffset'];
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$thisfile_bonk[$BonkTagName]['offset'] = $thisfile_bonk['dataoffset'];
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$this->HandleBonkTags($fd, $BonkTagName, $ThisFileInfo);
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}
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}
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if (empty($ThisFileInfo['audio']['encoder'])) {
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$ThisFileInfo['audio']['encoder'] = 'Extended BONK v0.9+';
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}
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if (empty($thisfile_bonk['BONK'])) {
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unset($ThisFileInfo['bonk']);
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}
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return true;
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}
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function HandleBonkTags(&$fd, &$BonkTagName, &$ThisFileInfo) {
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switch ($BonkTagName) {
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case 'BONK':
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// shortcut
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$thisfile_bonk_BONK = &$ThisFileInfo['bonk']['BONK'];
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$BonkData = "\x00".'BONK'.fread($fd, 17);
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$thisfile_bonk_BONK['version'] = getid3_lib::LittleEndian2Int(substr($BonkData, 5, 1));
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$thisfile_bonk_BONK['number_samples'] = getid3_lib::LittleEndian2Int(substr($BonkData, 6, 4));
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$thisfile_bonk_BONK['sample_rate'] = getid3_lib::LittleEndian2Int(substr($BonkData, 10, 4));
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$thisfile_bonk_BONK['channels'] = getid3_lib::LittleEndian2Int(substr($BonkData, 14, 1));
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$thisfile_bonk_BONK['lossless'] = (bool) getid3_lib::LittleEndian2Int(substr($BonkData, 15, 1));
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$thisfile_bonk_BONK['joint_stereo'] = (bool) getid3_lib::LittleEndian2Int(substr($BonkData, 16, 1));
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$thisfile_bonk_BONK['number_taps'] = getid3_lib::LittleEndian2Int(substr($BonkData, 17, 2));
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$thisfile_bonk_BONK['downsampling_ratio'] = getid3_lib::LittleEndian2Int(substr($BonkData, 19, 1));
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$thisfile_bonk_BONK['samples_per_packet'] = getid3_lib::LittleEndian2Int(substr($BonkData, 20, 2));
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$ThisFileInfo['avdataoffset'] = $thisfile_bonk_BONK['offset'] + 5 + 17;
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$ThisFileInfo['avdataend'] = $thisfile_bonk_BONK['offset'] + $thisfile_bonk_BONK['size'];
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$ThisFileInfo['fileformat'] = 'bonk';
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$ThisFileInfo['audio']['dataformat'] = 'bonk';
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$ThisFileInfo['audio']['bitrate_mode'] = 'vbr'; // assumed
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$ThisFileInfo['audio']['channels'] = $thisfile_bonk_BONK['channels'];
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$ThisFileInfo['audio']['sample_rate'] = $thisfile_bonk_BONK['sample_rate'];
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$ThisFileInfo['audio']['channelmode'] = ($thisfile_bonk_BONK['joint_stereo'] ? 'joint stereo' : 'stereo');
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$ThisFileInfo['audio']['lossless'] = $thisfile_bonk_BONK['lossless'];
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$ThisFileInfo['audio']['codec'] = 'bonk';
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$ThisFileInfo['playtime_seconds'] = $thisfile_bonk_BONK['number_samples'] / ($thisfile_bonk_BONK['sample_rate'] * $thisfile_bonk_BONK['channels']);
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if ($ThisFileInfo['playtime_seconds'] > 0) {
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$ThisFileInfo['audio']['bitrate'] = (($ThisFileInfo['bonk']['dataend'] - $ThisFileInfo['bonk']['dataoffset']) * 8) / $ThisFileInfo['playtime_seconds'];
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}
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break;
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case 'INFO':
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// shortcut
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$thisfile_bonk_INFO = &$ThisFileInfo['bonk']['INFO'];
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$thisfile_bonk_INFO['version'] = getid3_lib::LittleEndian2Int(fread($fd, 1));
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$thisfile_bonk_INFO['entries_count'] = 0;
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$NextInfoDataPair = fread($fd, 5);
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if (!$this->BonkIsValidTagName(substr($NextInfoDataPair, 1, 4))) {
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while (!feof($fd)) {
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//$CurrentSeekInfo['offset'] = getid3_lib::LittleEndian2Int(substr($NextInfoDataPair, 0, 4));
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//$CurrentSeekInfo['nextbit'] = getid3_lib::LittleEndian2Int(substr($NextInfoDataPair, 4, 1));
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//$thisfile_bonk_INFO[] = $CurrentSeekInfo;
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$NextInfoDataPair = fread($fd, 5);
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if ($this->BonkIsValidTagName(substr($NextInfoDataPair, 1, 4))) {
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fseek($fd, -5, SEEK_CUR);
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break;
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}
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$thisfile_bonk_INFO['entries_count']++;
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}
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}
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break;
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case 'META':
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$BonkData = "\x00".'META'.fread($fd, $ThisFileInfo['bonk']['META']['size'] - 5);
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$ThisFileInfo['bonk']['META']['version'] = getid3_lib::LittleEndian2Int(substr($BonkData, 5, 1));
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$MetaTagEntries = floor(((strlen($BonkData) - 8) - 6) / 8); // BonkData - xxxxmeta - <20>META
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$offset = 6;
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for ($i = 0; $i < $MetaTagEntries; $i++) {
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$MetaEntryTagName = substr($BonkData, $offset, 4);
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$offset += 4;
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$MetaEntryTagOffset = getid3_lib::LittleEndian2Int(substr($BonkData, $offset, 4));
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$offset += 4;
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$ThisFileInfo['bonk']['META']['tags'][$MetaEntryTagName] = $MetaEntryTagOffset;
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}
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break;
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case ' ID3':
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$ThisFileInfo['audio']['encoder'] = 'Extended BONK v0.9+';
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// ID3v2 checking is optional
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if (class_exists('getid3_id3v2')) {
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$ThisFileInfo['bonk'][' ID3']['valid'] = new getid3_id3v2($fd, $ThisFileInfo, $ThisFileInfo['bonk'][' ID3']['offset'] + 2);
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}
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break;
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default:
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$ThisFileInfo['warning'][] = 'Unexpected Bonk tag "'.$BonkTagName.'" at offset '.$ThisFileInfo['bonk'][$BonkTagName]['offset'];
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break;
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}
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}
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function BonkIsValidTagName($PossibleBonkTag, $ignorecase=false) {
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static $BonkIsValidTagName = array('BONK', 'INFO', ' ID3', 'META');
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foreach ($BonkIsValidTagName as $validtagname) {
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if ($validtagname == $PossibleBonkTag) {
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return true;
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} elseif ($ignorecase && (strtolower($validtagname) == strtolower($PossibleBonkTag))) {
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return true;
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}
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}
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return false;
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}
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}
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?>
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