name : module.audio.la.php <?php ///////////////////////////////////////////////////////////////// /// getID3() by James Heinrich <info@getid3.org> // // available at https://github.com/JamesHeinrich/getID3 // // or https://www.getid3.org // // or http://getid3.sourceforge.net // // see readme.txt for more details // ///////////////////////////////////////////////////////////////// // // // module.audio.la.php // // module for analyzing LA (LosslessAudio) audio files // // dependencies: module.audio.riff.php // // /// ///////////////////////////////////////////////////////////////// if (!defined('GETID3_INCLUDEPATH')) { // prevent path-exposing attacks that access modules directly on public webservers exit; } getid3_lib::IncludeDependency(GETID3_INCLUDEPATH.'module.audio-video.riff.php', __FILE__, true); class getid3_la extends getid3_handler { /** * @return bool */ public function Analyze() { $info = &$this->getid3->info; $offset = 0; $this->fseek($info['avdataoffset']); $rawdata = $this->fread($this->getid3->fread_buffer_size()); switch (substr($rawdata, $offset, 4)) { case 'LA02': case 'LA03': case 'LA04': $info['fileformat'] = 'la'; $info['audio']['dataformat'] = 'la'; $info['audio']['lossless'] = true; $info['la']['version_major'] = (int) substr($rawdata, $offset + 2, 1); $info['la']['version_minor'] = (int) substr($rawdata, $offset + 3, 1); $info['la']['version'] = (float) $info['la']['version_major'] + ($info['la']['version_minor'] / 10); $offset += 4; $info['la']['uncompressed_size'] = getid3_lib::LittleEndian2Int(substr($rawdata, $offset, 4)); $offset += 4; if ($info['la']['uncompressed_size'] == 0) { $this->error('Corrupt LA file: uncompressed_size == zero'); return false; } $WAVEchunk = substr($rawdata, $offset, 4); if ($WAVEchunk !== 'WAVE') { $this->error('Expected "WAVE" ('.getid3_lib::PrintHexBytes('WAVE').') at offset '.$offset.', found "'.$WAVEchunk.'" ('.getid3_lib::PrintHexBytes($WAVEchunk).') instead.'); return false; } $offset += 4; $info['la']['fmt_size'] = 24; if ($info['la']['version'] >= 0.3) { $info['la']['fmt_size'] = getid3_lib::LittleEndian2Int(substr($rawdata, $offset, 4)); $info['la']['header_size'] = 49 + $info['la']['fmt_size'] - 24; $offset += 4; } else { // version 0.2 didn't support additional data blocks $info['la']['header_size'] = 41; } $fmt_chunk = substr($rawdata, $offset, 4); if ($fmt_chunk !== 'fmt ') { $this->error('Expected "fmt " ('.getid3_lib::PrintHexBytes('fmt ').') at offset '.$offset.', found "'.$fmt_chunk.'" ('.getid3_lib::PrintHexBytes($fmt_chunk).') instead.'); return false; } $offset += 4; $fmt_size = getid3_lib::LittleEndian2Int(substr($rawdata, $offset, 4)); $offset += 4; $info['la']['raw']['format'] = getid3_lib::LittleEndian2Int(substr($rawdata, $offset, 2)); $offset += 2; $info['la']['channels'] = getid3_lib::LittleEndian2Int(substr($rawdata, $offset, 2)); $offset += 2; if ($info['la']['channels'] == 0) { $this->error('Corrupt LA file: channels == zero'); return false; } $info['la']['sample_rate'] = getid3_lib::LittleEndian2Int(substr($rawdata, $offset, 4)); $offset += 4; if ($info['la']['sample_rate'] == 0) { $this->error('Corrupt LA file: sample_rate == zero'); return false; } $info['la']['bytes_per_second'] = getid3_lib::LittleEndian2Int(substr($rawdata, $offset, 4)); $offset += 4; $info['la']['bytes_per_sample'] = getid3_lib::LittleEndian2Int(substr($rawdata, $offset, 2)); $offset += 2; $info['la']['bits_per_sample'] = getid3_lib::LittleEndian2Int(substr($rawdata, $offset, 2)); $offset += 2; $info['la']['samples'] = getid3_lib::LittleEndian2Int(substr($rawdata, $offset, 4)); $offset += 4; $info['la']['raw']['flags'] = getid3_lib::LittleEndian2Int(substr($rawdata, $offset, 1)); $offset += 1; $info['la']['flags']['seekable'] = (bool) ($info['la']['raw']['flags'] & 0x01); if ($info['la']['version'] >= 0.4) { $info['la']['flags']['high_compression'] = (bool) ($info['la']['raw']['flags'] & 0x02); } $info['la']['original_crc'] = getid3_lib::LittleEndian2Int(substr($rawdata, $offset, 4)); $offset += 4; // mikeØbevin*de // Basically, the blocksize/seekevery are 61440/19 in La0.4 and 73728/16 // in earlier versions. A seekpoint is added every blocksize * seekevery // samples, so 4 * int(totalSamples / (blockSize * seekEvery)) should // give the number of bytes used for the seekpoints. Of course, if seeking // is disabled, there are no seekpoints stored. if ($info['la']['version'] >= 0.4) { $info['la']['blocksize'] = 61440; $info['la']['seekevery'] = 19; } else { $info['la']['blocksize'] = 73728; $info['la']['seekevery'] = 16; } $info['la']['seekpoint_count'] = 0; if ($info['la']['flags']['seekable']) { $info['la']['seekpoint_count'] = floor($info['la']['samples'] / ($info['la']['blocksize'] * $info['la']['seekevery'])); for ($i = 0; $i < $info['la']['seekpoint_count']; $i++) { $info['la']['seekpoints'][] = getid3_lib::LittleEndian2Int(substr($rawdata, $offset, 4)); $offset += 4; } } if ($info['la']['version'] >= 0.3) { // Following the main header information, the program outputs all of the // seekpoints. Following these is what I called the 'footer start', // i.e. the position immediately after the La audio data is finished. $info['la']['footerstart'] = getid3_lib::LittleEndian2Int(substr($rawdata, $offset, 4)); $offset += 4; if ($info['la']['footerstart'] > $info['filesize']) { $this->warning('FooterStart value points to offset '.$info['la']['footerstart'].' which is beyond end-of-file ('.$info['filesize'].')'); $info['la']['footerstart'] = $info['filesize']; } } else { // La v0.2 didn't have FooterStart value $info['la']['footerstart'] = $info['avdataend']; } if ($info['la']['footerstart'] < $info['avdataend']) { if ($RIFFtempfilename = tempnam(GETID3_TEMP_DIR, 'id3')) { if ($RIFF_fp = fopen($RIFFtempfilename, 'w+b')) { $RIFFdata = 'WAVE'; if ($info['la']['version'] == 0.2) { $RIFFdata .= substr($rawdata, 12, 24); } else { $RIFFdata .= substr($rawdata, 16, 24); } if ($info['la']['footerstart'] < $info['avdataend']) { $this->fseek($info['la']['footerstart']); $RIFFdata .= $this->fread($info['avdataend'] - $info['la']['footerstart']); } $RIFFdata = 'RIFF'.getid3_lib::LittleEndian2String(strlen($RIFFdata), 4, false).$RIFFdata; fwrite($RIFF_fp, $RIFFdata, strlen($RIFFdata)); fclose($RIFF_fp); $getid3_temp = new getID3(); $getid3_temp->openfile($RIFFtempfilename); $getid3_riff = new getid3_riff($getid3_temp); $getid3_riff->Analyze(); if (empty($getid3_temp->info['error'])) { $info['riff'] = $getid3_temp->info['riff']; } else { $this->warning('Error parsing RIFF portion of La file: '.implode($getid3_temp->info['error'])); } unset($getid3_temp, $getid3_riff); } unlink($RIFFtempfilename); } } // $info['avdataoffset'] should be zero to begin with, but just in case it's not, include the addition anyway $info['avdataend'] = $info['avdataoffset'] + $info['la']['footerstart']; $info['avdataoffset'] = $info['avdataoffset'] + $offset; $info['la']['compression_ratio'] = (float) (($info['avdataend'] - $info['avdataoffset']) / $info['la']['uncompressed_size']); $info['playtime_seconds'] = (float) ($info['la']['samples'] / $info['la']['sample_rate']) / $info['la']['channels']; if ($info['playtime_seconds'] == 0) { $this->error('Corrupt LA file: playtime_seconds == zero'); return false; } $info['audio']['bitrate'] = ($info['avdataend'] - $info['avdataoffset']) * 8 / $info['playtime_seconds']; //$info['audio']['codec'] = $info['la']['codec']; $info['audio']['bits_per_sample'] = $info['la']['bits_per_sample']; break; default: if (substr($rawdata, $offset, 2) == 'LA') { $this->error('This version of getID3() ['.$this->getid3->version().'] does not support LA version '.substr($rawdata, $offset + 2, 1).'.'.substr($rawdata, $offset + 3, 1).' which this appears to be - check http://getid3.sourceforge.net for updates.'); } else { $this->error('Not a LA (Lossless-Audio) file'); } return false; } $info['audio']['channels'] = $info['la']['channels']; $info['audio']['sample_rate'] = (int) $info['la']['sample_rate']; $info['audio']['encoder'] = 'LA v'.$info['la']['version']; return true; } }