--- /dev/null
+<?php
+/////////////////////////////////////////////////////////////////
+/// getID3() by James Heinrich <info@getid3.org> //
+// available at http://getid3.sourceforge.net //
+// or http://www.getid3.org //
+// also https://github.com/JamesHeinrich/getID3 //
+/////////////////////////////////////////////////////////////////
+// See readme.txt for more details //
+/////////////////////////////////////////////////////////////////
+// //
+// module.audio.la.php //
+// module for analyzing LA (LosslessAudio) audio files //
+// dependencies: module.audio.riff.php //
+// ///
+/////////////////////////////////////////////////////////////////
+
+getid3_lib::IncludeDependency(GETID3_INCLUDEPATH.'module.audio-video.riff.php', __FILE__, true);
+
+class getid3_la extends getid3_handler
+{
+
+ 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;
+ break;
+ }
+
+ $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;
+ }
+
+}
scripts.mit.edu / autoinstallsdev / mediawiki.git / blobdiff