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