mirror of
https://github.com/Yetangitu/ampache
synced 2025-10-05 02:39:47 +02:00
196 lines
No EOL
9.1 KiB
PHP
196 lines
No EOL
9.1 KiB
PHP
<?php
|
|
// +----------------------------------------------------------------------+
|
|
// | PHP version 5 |
|
|
// +----------------------------------------------------------------------+
|
|
// | Copyright (c) 2002-2006 James Heinrich, Allan Hansen |
|
|
// +----------------------------------------------------------------------+
|
|
// | This source file is subject to version 2 of the GPL license, |
|
|
// | that is bundled with this package in the file license.txt and is |
|
|
// | available through the world-wide-web at the following url: |
|
|
// | http://www.gnu.org/copyleft/gpl.html |
|
|
// +----------------------------------------------------------------------+
|
|
// | getID3() - http://getid3.sourceforge.net or http://www.getid3.org |
|
|
// +----------------------------------------------------------------------+
|
|
// | Authors: James Heinrich <infoØgetid3*org> |
|
|
// | Allan Hansen <ahØartemis*dk> |
|
|
// +----------------------------------------------------------------------+
|
|
// | module.audio.la.php |
|
|
// | Module for analyzing LA udio files |
|
|
// | dependencies: module.audio-video.riff.php |
|
|
// +----------------------------------------------------------------------+
|
|
//
|
|
// $Id: module.audio.la.php,v 1.2 2006/11/02 10:48:01 ah Exp $
|
|
|
|
|
|
|
|
class getid3_la extends getid3_handler
|
|
{
|
|
|
|
public function Analyze() {
|
|
|
|
$getid3 = $this->getid3;
|
|
|
|
$getid3->include_module('audio-video.riff');
|
|
|
|
fseek($getid3->fp, $getid3->info['avdataoffset'], SEEK_SET);
|
|
$raw_data = fread($getid3->fp, getid3::FREAD_BUFFER_SIZE);
|
|
|
|
$getid3->info['fileformat'] = 'la';
|
|
$getid3->info['audio']['dataformat'] = 'la';
|
|
$getid3->info['audio']['lossless'] = true;
|
|
|
|
$getid3->info['la']['version_major'] = (int)$raw_data{2};
|
|
$getid3->info['la']['version_minor'] = (int)$raw_data{3};
|
|
$getid3->info['la']['version'] = (float)$getid3->info['la']['version_major'] + ($getid3->info['la']['version_minor'] / 10);
|
|
|
|
$getid3->info['la']['uncompressed_size'] = getid3_lib::LittleEndian2Int(substr($raw_data, 4, 4));
|
|
|
|
$wave_chunk = substr($raw_data, 8, 4);
|
|
if ($wave_chunk !== 'WAVE') {
|
|
throw new getid3_exception('Expected "WAVE" ('.getid3_lib::PrintHexBytes('WAVE').') at offset 8, found "'.$wave_chunk.'" ('.getid3_lib::PrintHexBytes($wave_chunk).') instead.');
|
|
}
|
|
|
|
$offset = 12;
|
|
|
|
$getid3->info['la']['fmt_size'] = 24;
|
|
if ($getid3->info['la']['version'] >= 0.3) {
|
|
|
|
$getid3->info['la']['fmt_size'] = getid3_lib::LittleEndian2Int(substr($raw_data, $offset, 4));
|
|
$getid3->info['la']['header_size'] = 49 + $getid3->info['la']['fmt_size'] - 24;
|
|
$offset += 4;
|
|
|
|
} else {
|
|
|
|
// version 0.2 didn't support additional data blocks
|
|
$getid3->info['la']['header_size'] = 41;
|
|
}
|
|
|
|
$fmt_chunk = substr($raw_data, $offset, 4);
|
|
if ($fmt_chunk !== 'fmt ') {
|
|
throw new getid3_exception('Expected "fmt " ('.getid3_lib::PrintHexBytes('fmt ').') at offset '.$offset.', found "'.$fmt_chunk.'" ('.getid3_lib::PrintHexBytes($fmt_chunk).') instead.');
|
|
}
|
|
$offset += 4;
|
|
|
|
$fmt_size = getid3_lib::LittleEndian2Int(substr($raw_data, $offset, 4));
|
|
$offset += 4;
|
|
|
|
$getid3->info['la']['raw']['format'] = getid3_lib::LittleEndian2Int(substr($raw_data, $offset, 2));
|
|
$offset += 2;
|
|
|
|
getid3_lib::ReadSequence('LittleEndian2Int', $getid3->info['la'], $raw_data, $offset,
|
|
array (
|
|
'channels' => 2,
|
|
'sample_rate' => 4,
|
|
'bytes_per_second' => 4,
|
|
'bytes_per_sample' => 2,
|
|
'bits_per_sample' => 2,
|
|
'samples' => 4
|
|
)
|
|
);
|
|
$offset += 18;
|
|
|
|
$getid3->info['la']['raw']['flags'] = getid3_lib::LittleEndian2Int($raw_data{$offset++});
|
|
|
|
$getid3->info['la']['flags']['seekable'] = (bool)($getid3->info['la']['raw']['flags'] & 0x01);
|
|
if ($getid3->info['la']['version'] >= 0.4) {
|
|
$getid3->info['la']['flags']['high_compression'] = (bool)($getid3->info['la']['raw']['flags'] & 0x02);
|
|
}
|
|
|
|
$getid3->info['la']['original_crc'] = getid3_lib::LittleEndian2Int(substr($raw_data, $offset, 4));
|
|
$offset += 4;
|
|
|
|
// mikeØbevin*de
|
|
// Basically, the blocksize/seekevery are 61440/19 in La0.4 and 73728/16
|
|
// in earlier versions. A seekpoint is added every blocksize * seekevery
|
|
// samples, so 4 * int(totalSamples / (blockSize * seekEvery)) should
|
|
// give the number of bytes used for the seekpoints. Of course, if seeking
|
|
// is disabled, there are no seekpoints stored.
|
|
|
|
if ($getid3->info['la']['version'] >= 0.4) {
|
|
$getid3->info['la']['blocksize'] = 61440;
|
|
$getid3->info['la']['seekevery'] = 19;
|
|
} else {
|
|
$getid3->info['la']['blocksize'] = 73728;
|
|
$getid3->info['la']['seekevery'] = 16;
|
|
}
|
|
|
|
$getid3->info['la']['seekpoint_count'] = 0;
|
|
if ($getid3->info['la']['flags']['seekable']) {
|
|
$getid3->info['la']['seekpoint_count'] = floor($getid3->info['la']['samples'] / ($getid3->info['la']['blocksize'] * $getid3->info['la']['seekevery']));
|
|
|
|
for ($i = 0; $i < $getid3->info['la']['seekpoint_count']; $i++) {
|
|
$getid3->info['la']['seekpoints'][] = getid3_lib::LittleEndian2Int(substr($raw_data, $offset, 4));
|
|
$offset += 4;
|
|
}
|
|
}
|
|
|
|
if ($getid3->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.
|
|
|
|
$getid3->info['la']['footerstart'] = getid3_lib::LittleEndian2Int(substr($raw_data, $offset, 4));
|
|
$offset += 4;
|
|
|
|
if ($getid3->info['la']['footerstart'] > $getid3->info['filesize']) {
|
|
$getid3->warning('FooterStart value points to offset '.$getid3->info['la']['footerstart'].' which is beyond end-of-file ('.$getid3->info['filesize'].')');
|
|
$getid3->info['la']['footerstart'] = $getid3->info['filesize'];
|
|
}
|
|
|
|
} else {
|
|
|
|
// La v0.2 didn't have FooterStart value
|
|
$getid3->info['la']['footerstart'] = $getid3->info['avdataend'];
|
|
|
|
}
|
|
|
|
if ($getid3->info['la']['footerstart'] < $getid3->info['avdataend']) {
|
|
|
|
// Create riff header
|
|
$riff_data = 'WAVE';
|
|
if ($getid3->info['la']['version'] == 0.2) {
|
|
$riff_data .= substr($raw_data, 12, 24);
|
|
} else {
|
|
$riff_data .= substr($raw_data, 16, 24);
|
|
}
|
|
if ($getid3->info['la']['footerstart'] < $getid3->info['avdataend']) {
|
|
fseek($getid3->fp, $getid3->info['la']['footerstart'], SEEK_SET);
|
|
$riff_data .= fread($getid3->fp, $getid3->info['avdataend'] - $getid3->info['la']['footerstart']);
|
|
}
|
|
$riff_data = 'RIFF'.getid3_lib::LittleEndian2String(strlen($riff_data), 4, false).$riff_data;
|
|
|
|
// Clone getid3 - messing with offsets - better safe than sorry
|
|
$clone = clone $getid3;
|
|
|
|
// Analyze clone by string
|
|
$riff = new getid3_riff($clone);
|
|
$riff->AnalyzeString($riff_data);
|
|
|
|
// Import from clone and destroy
|
|
$getid3->info['riff'] = $clone->info['riff'];
|
|
$getid3->warnings($clone->warnings());
|
|
unset($clone);
|
|
}
|
|
|
|
// $getid3->info['avdataoffset'] should be zero to begin with, but just in case it's not, include the addition anyway
|
|
$getid3->info['avdataend'] = $getid3->info['avdataoffset'] + $getid3->info['la']['footerstart'];
|
|
$getid3->info['avdataoffset'] = $getid3->info['avdataoffset'] + $offset;
|
|
|
|
$getid3->info['la']['compression_ratio'] = (float)(($getid3->info['avdataend'] - $getid3->info['avdataoffset']) / $getid3->info['la']['uncompressed_size']);
|
|
$getid3->info['playtime_seconds'] = (float)($getid3->info['la']['samples'] / $getid3->info['la']['sample_rate']) / $getid3->info['la']['channels'];
|
|
|
|
$getid3->info['audio']['bitrate'] = ($getid3->info['avdataend'] - $getid3->info['avdataoffset']) * 8 / $getid3->info['playtime_seconds'];
|
|
$getid3->info['audio']['bits_per_sample'] = $getid3->info['la']['bits_per_sample'];
|
|
|
|
$getid3->info['audio']['channels'] = $getid3->info['la']['channels'];
|
|
$getid3->info['audio']['sample_rate'] = (int)$getid3->info['la']['sample_rate'];
|
|
$getid3->info['audio']['encoder'] = 'LA v'.$getid3->info['la']['version'];
|
|
|
|
return true;
|
|
}
|
|
|
|
}
|
|
|
|
|
|
?>
|