Файл: my.net.ru/system/libs/getid3/module.audio.dsf.php
Строк: 251
<?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.dsf.php //
// module for analyzing dsf/DSF Audio files //
// dependencies: module.tag.id3v2.php //
// ///
/////////////////////////////////////////////////////////////////
if (!defined('GETID3_INCLUDEPATH')) { // prevent path-exposing attacks that access modules directly on public webservers
exit;
}
getid3_lib::IncludeDependency(GETID3_INCLUDEPATH.'module.tag.id3v2.php', __FILE__, true);
class getid3_dsf extends getid3_handler
{
/**
* @return bool
*/
public function Analyze() {
$info = &$this->getid3->info;
$info['fileformat'] = 'dsf';
$info['audio']['dataformat'] = 'dsf';
$info['audio']['lossless'] = true;
$info['audio']['bitrate_mode'] = 'cbr';
$this->fseek($info['avdataoffset']);
$dsfheader = $this->fread(28 + 12);
$headeroffset = 0;
$info['dsf']['dsd']['magic'] = substr($dsfheader, $headeroffset, 4);
$headeroffset += 4;
$magic = 'DSD ';
if ($info['dsf']['dsd']['magic'] != $magic) {
$this->error('Expecting "'.getid3_lib::PrintHexBytes($magic).'" at offset '.$info['avdataoffset'].', found "'.getid3_lib::PrintHexBytes($info['dsf']['dsd']['magic']).'"');
unset($info['fileformat']);
unset($info['audio']);
unset($info['dsf']);
return false;
}
$info['dsf']['dsd']['dsd_chunk_size'] = getid3_lib::LittleEndian2Int(substr($dsfheader, $headeroffset, 8)); // should be 28
$headeroffset += 8;
$info['dsf']['dsd']['dsf_file_size'] = getid3_lib::LittleEndian2Int(substr($dsfheader, $headeroffset, 8));
$headeroffset += 8;
$info['dsf']['dsd']['meta_chunk_offset'] = getid3_lib::LittleEndian2Int(substr($dsfheader, $headeroffset, 8));
$headeroffset += 8;
$info['dsf']['fmt']['magic'] = substr($dsfheader, $headeroffset, 4);
$headeroffset += 4;
$magic = 'fmt ';
if ($info['dsf']['fmt']['magic'] != $magic) {
$this->error('Expecting "'.getid3_lib::PrintHexBytes($magic).'" at offset '.$headeroffset.', found "'.getid3_lib::PrintHexBytes($info['dsf']['fmt']['magic']).'"');
return false;
}
$info['dsf']['fmt']['fmt_chunk_size'] = getid3_lib::LittleEndian2Int(substr($dsfheader, $headeroffset, 8)); // usually 52 bytes
$headeroffset += 8;
$dsfheader .= $this->fread($info['dsf']['fmt']['fmt_chunk_size'] - 12 + 12); // we have already read the entire DSD chunk, plus 12 bytes of FMT. We now want to read the size of FMT, plus 12 bytes into the next chunk to get magic and size.
if (strlen($dsfheader) != ($info['dsf']['dsd']['dsd_chunk_size'] + $info['dsf']['fmt']['fmt_chunk_size'] + 12)) {
$this->error('Expecting '.($info['dsf']['dsd']['dsd_chunk_size'] + $info['dsf']['fmt']['fmt_chunk_size']).' bytes header, found '.strlen($dsfheader).' bytes');
return false;
}
$info['dsf']['fmt']['format_version'] = getid3_lib::LittleEndian2Int(substr($dsfheader, $headeroffset, 4)); // usually "1"
$headeroffset += 4;
$info['dsf']['fmt']['format_id'] = getid3_lib::LittleEndian2Int(substr($dsfheader, $headeroffset, 4)); // usually "0" = "DSD Raw"
$headeroffset += 4;
$info['dsf']['fmt']['channel_type_id'] = getid3_lib::LittleEndian2Int(substr($dsfheader, $headeroffset, 4));
$headeroffset += 4;
$info['dsf']['fmt']['channels'] = getid3_lib::LittleEndian2Int(substr($dsfheader, $headeroffset, 4));
$headeroffset += 4;
$info['dsf']['fmt']['sample_rate'] = getid3_lib::LittleEndian2Int(substr($dsfheader, $headeroffset, 4));
$headeroffset += 4;
$info['dsf']['fmt']['bits_per_sample'] = getid3_lib::LittleEndian2Int(substr($dsfheader, $headeroffset, 4));
$headeroffset += 4;
$info['dsf']['fmt']['sample_count'] = getid3_lib::LittleEndian2Int(substr($dsfheader, $headeroffset, 8));
$headeroffset += 8;
$info['dsf']['fmt']['channel_block_size'] = getid3_lib::LittleEndian2Int(substr($dsfheader, $headeroffset, 4));
$headeroffset += 4;
$info['dsf']['fmt']['reserved'] = getid3_lib::LittleEndian2Int(substr($dsfheader, $headeroffset, 4)); // zero-filled
$headeroffset += 4;
$info['dsf']['data']['magic'] = substr($dsfheader, $headeroffset, 4);
$headeroffset += 4;
$magic = 'data';
if ($info['dsf']['data']['magic'] != $magic) {
$this->error('Expecting "'.getid3_lib::PrintHexBytes($magic).'" at offset '.$headeroffset.', found "'.getid3_lib::PrintHexBytes($info['dsf']['data']['magic']).'"');
return false;
}
$info['dsf']['data']['data_chunk_size'] = getid3_lib::LittleEndian2Int(substr($dsfheader, $headeroffset, 8));
$headeroffset += 8;
$info['avdataoffset'] = $headeroffset;
$info['avdataend'] = $info['avdataoffset'] + $info['dsf']['data']['data_chunk_size'];
if ($info['dsf']['dsd']['meta_chunk_offset'] > 0) {
$getid3_id3v2 = new getid3_id3v2($this->getid3);
$getid3_id3v2->StartingOffset = $info['dsf']['dsd']['meta_chunk_offset'];
$getid3_id3v2->Analyze();
unset($getid3_id3v2);
}
$info['dsf']['fmt']['channel_type'] = $this->DSFchannelTypeLookup($info['dsf']['fmt']['channel_type_id']);
$info['audio']['channelmode'] = $info['dsf']['fmt']['channel_type'];
$info['audio']['bits_per_sample'] = $info['dsf']['fmt']['bits_per_sample'];
$info['audio']['sample_rate'] = $info['dsf']['fmt']['sample_rate'];
$info['audio']['channels'] = $info['dsf']['fmt']['channels'];
$info['audio']['bitrate'] = $info['audio']['bits_per_sample'] * $info['audio']['sample_rate'] * $info['audio']['channels'];
$info['playtime_seconds'] = ($info['dsf']['data']['data_chunk_size'] * 8) / $info['audio']['bitrate'];
return true;
}
/**
* @param int $channel_type_id
*
* @return string
*/
public static function DSFchannelTypeLookup($channel_type_id) {
static $DSFchannelTypeLookup = array(
// interleaving order:
1 => 'mono', // 1: Mono
2 => 'stereo', // 1: Front-Left; 2: Front-Right
3 => '3-channel', // 1: Front-Left; 2: Front-Right; 3: Center
4 => 'quad', // 1: Front-Left; 2: Front-Right; 3: Back-Left; 4: Back-Right
5 => '4-channel', // 1: Front-Left; 2: Front-Right; 3: Center; 4: Low-Frequency
6 => '5-channel', // 1: Front-Left; 2: Front-Right; 3: Center; 4: Back-Left 5: Back-Right
7 => '5.1', // 1: Front-Left; 2: Front-Right; 3: Center; 4: Low-Frequency; 5: Back-Left; 6: Back-Right
);
return (isset($DSFchannelTypeLookup[$channel_type_id]) ? $DSFchannelTypeLookup[$channel_type_id] : '');
}
}