182 lines
7.5 KiB
PHP
182 lines
7.5 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.shorten.php //
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// module for analyzing Shorten Audio files //
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// dependencies: NONE //
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// ///
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/////////////////////////////////////////////////////////////////
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class getid3_shorten extends getid3_handler
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{
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public function Analyze() {
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$info = &$this->getid3->info;
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fseek($this->getid3->fp, $info['avdataoffset'], SEEK_SET);
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$ShortenHeader = fread($this->getid3->fp, 8);
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$magic = 'ajkg';
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if (substr($ShortenHeader, 0, 4) != $magic) {
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$info['error'][] = 'Expecting "'.getid3_lib::PrintHexBytes($magic).'" at offset '.$info['avdataoffset'].', found "'.getid3_lib::PrintHexBytes(substr($ShortenHeader, 0, 4)).'"';
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return false;
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}
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$info['fileformat'] = 'shn';
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$info['audio']['dataformat'] = 'shn';
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$info['audio']['lossless'] = true;
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$info['audio']['bitrate_mode'] = 'vbr';
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$info['shn']['version'] = getid3_lib::LittleEndian2Int(substr($ShortenHeader, 4, 1));
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fseek($this->getid3->fp, $info['avdataend'] - 12, SEEK_SET);
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$SeekTableSignatureTest = fread($this->getid3->fp, 12);
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$info['shn']['seektable']['present'] = (bool) (substr($SeekTableSignatureTest, 4, 8) == 'SHNAMPSK');
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if ($info['shn']['seektable']['present']) {
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$info['shn']['seektable']['length'] = getid3_lib::LittleEndian2Int(substr($SeekTableSignatureTest, 0, 4));
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$info['shn']['seektable']['offset'] = $info['avdataend'] - $info['shn']['seektable']['length'];
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fseek($this->getid3->fp, $info['shn']['seektable']['offset'], SEEK_SET);
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$SeekTableMagic = fread($this->getid3->fp, 4);
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$magic = 'SEEK';
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if ($SeekTableMagic != $magic) {
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$info['error'][] = 'Expecting "'.getid3_lib::PrintHexBytes($magic).'" at offset '.$info['shn']['seektable']['offset'].', found "'.getid3_lib::PrintHexBytes($SeekTableMagic).'"';
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return false;
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} else {
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// typedef struct tag_TSeekEntry
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// {
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// unsigned long SampleNumber;
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// unsigned long SHNFileByteOffset;
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// unsigned long SHNLastBufferReadPosition;
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// unsigned short SHNByteGet;
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// unsigned short SHNBufferOffset;
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// unsigned short SHNFileBitOffset;
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// unsigned long SHNGBuffer;
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// unsigned short SHNBitShift;
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// long CBuf0[3];
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// long CBuf1[3];
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// long Offset0[4];
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// long Offset1[4];
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// }TSeekEntry;
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$SeekTableData = fread($this->getid3->fp, $info['shn']['seektable']['length'] - 16);
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$info['shn']['seektable']['entry_count'] = floor(strlen($SeekTableData) / 80);
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//$info['shn']['seektable']['entries'] = array();
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//$SeekTableOffset = 0;
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//for ($i = 0; $i < $info['shn']['seektable']['entry_count']; $i++) {
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// $SeekTableEntry['sample_number'] = getid3_lib::LittleEndian2Int(substr($SeekTableData, $SeekTableOffset, 4));
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// $SeekTableOffset += 4;
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// $SeekTableEntry['shn_file_byte_offset'] = getid3_lib::LittleEndian2Int(substr($SeekTableData, $SeekTableOffset, 4));
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// $SeekTableOffset += 4;
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// $SeekTableEntry['shn_last_buffer_read_position'] = getid3_lib::LittleEndian2Int(substr($SeekTableData, $SeekTableOffset, 4));
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// $SeekTableOffset += 4;
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// $SeekTableEntry['shn_byte_get'] = getid3_lib::LittleEndian2Int(substr($SeekTableData, $SeekTableOffset, 2));
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// $SeekTableOffset += 2;
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// $SeekTableEntry['shn_buffer_offset'] = getid3_lib::LittleEndian2Int(substr($SeekTableData, $SeekTableOffset, 2));
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// $SeekTableOffset += 2;
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// $SeekTableEntry['shn_file_bit_offset'] = getid3_lib::LittleEndian2Int(substr($SeekTableData, $SeekTableOffset, 2));
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// $SeekTableOffset += 2;
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// $SeekTableEntry['shn_gbuffer'] = getid3_lib::LittleEndian2Int(substr($SeekTableData, $SeekTableOffset, 4));
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// $SeekTableOffset += 4;
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// $SeekTableEntry['shn_bit_shift'] = getid3_lib::LittleEndian2Int(substr($SeekTableData, $SeekTableOffset, 2));
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// $SeekTableOffset += 2;
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// for ($j = 0; $j < 3; $j++) {
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// $SeekTableEntry['cbuf0'][$j] = getid3_lib::LittleEndian2Int(substr($SeekTableData, $SeekTableOffset, 4));
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// $SeekTableOffset += 4;
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// }
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// for ($j = 0; $j < 3; $j++) {
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// $SeekTableEntry['cbuf1'][$j] = getid3_lib::LittleEndian2Int(substr($SeekTableData, $SeekTableOffset, 4));
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// $SeekTableOffset += 4;
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// }
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// for ($j = 0; $j < 4; $j++) {
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// $SeekTableEntry['offset0'][$j] = getid3_lib::LittleEndian2Int(substr($SeekTableData, $SeekTableOffset, 4));
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// $SeekTableOffset += 4;
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// }
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// for ($j = 0; $j < 4; $j++) {
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// $SeekTableEntry['offset1'][$j] = getid3_lib::LittleEndian2Int(substr($SeekTableData, $SeekTableOffset, 4));
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// $SeekTableOffset += 4;
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// }
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//
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// $info['shn']['seektable']['entries'][] = $SeekTableEntry;
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//}
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}
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}
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if (preg_match('#(1|ON)#i', ini_get('safe_mode'))) {
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$info['error'][] = 'PHP running in Safe Mode - backtick operator not available, cannot run shntool to analyze Shorten files';
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return false;
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}
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if (GETID3_OS_ISWINDOWS) {
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$RequiredFiles = array('shorten.exe', 'cygwin1.dll', 'head.exe');
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foreach ($RequiredFiles as $required_file) {
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if (!is_readable(GETID3_HELPERAPPSDIR.$required_file)) {
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$info['error'][] = GETID3_HELPERAPPSDIR.$required_file.' does not exist';
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return false;
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}
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}
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$commandline = GETID3_HELPERAPPSDIR.'shorten.exe -x "'.$info['filenamepath'].'" - | '.GETID3_HELPERAPPSDIR.'head.exe -c 64';
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$commandline = str_replace('/', '\\', $commandline);
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} else {
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static $shorten_present;
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if (!isset($shorten_present)) {
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$shorten_present = file_exists('/usr/local/bin/shorten') || `which shorten`;
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}
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if (!$shorten_present) {
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$info['error'][] = 'shorten binary was not found in path or /usr/local/bin';
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return false;
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}
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$commandline = (file_exists('/usr/local/bin/shorten') ? '/usr/local/bin/' : '' ) . 'shorten -x '.escapeshellarg($info['filenamepath']).' - | head -c 64';
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}
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$output = `$commandline`;
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if (!empty($output) && (substr($output, 12, 4) == 'fmt ')) {
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getid3_lib::IncludeDependency(GETID3_INCLUDEPATH.'module.audio-video.riff.php', __FILE__, true);
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$fmt_size = getid3_lib::LittleEndian2Int(substr($output, 16, 4));
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$DecodedWAVFORMATEX = getid3_riff::parseWAVEFORMATex(substr($output, 20, $fmt_size));
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$info['audio']['channels'] = $DecodedWAVFORMATEX['channels'];
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$info['audio']['bits_per_sample'] = $DecodedWAVFORMATEX['bits_per_sample'];
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$info['audio']['sample_rate'] = $DecodedWAVFORMATEX['sample_rate'];
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if (substr($output, 20 + $fmt_size, 4) == 'data') {
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$info['playtime_seconds'] = getid3_lib::LittleEndian2Int(substr($output, 20 + 4 + $fmt_size, 4)) / $DecodedWAVFORMATEX['raw']['nAvgBytesPerSec'];
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} else {
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$info['error'][] = 'shorten failed to decode DATA chunk to expected location, cannot determine playtime';
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return false;
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}
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$info['audio']['bitrate'] = (($info['avdataend'] - $info['avdataoffset']) / $info['playtime_seconds']) * 8;
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} else {
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$info['error'][] = 'shorten failed to decode file to WAV for parsing';
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return false;
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}
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return true;
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}
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}
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