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