143 lines
7.0 KiB
PHP
143 lines
7.0 KiB
PHP
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<?php
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/////////////////////////////////////////////////////////////////
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/// getID3() by James Heinrich <info@getid3.org> //
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// available at https://github.com/JamesHeinrich/getID3 //
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// or https://www.getid3.org //
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// or http://getid3.sourceforge.net //
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// see readme.txt for more details //
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/////////////////////////////////////////////////////////////////
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// //
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// module.audio.dsf.php //
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// module for analyzing dsf/DSF Audio files //
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// dependencies: module.tag.id3v2.php //
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// ///
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/////////////////////////////////////////////////////////////////
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if (!defined('GETID3_INCLUDEPATH')) { // prevent path-exposing attacks that access modules directly on public webservers
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exit;
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}
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getid3_lib::IncludeDependency(GETID3_INCLUDEPATH.'module.tag.id3v2.php', __FILE__, true);
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class getid3_dsf extends getid3_handler
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{
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/**
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* @return bool
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*/
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public function Analyze() {
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$info = &$this->getid3->info;
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$info['fileformat'] = 'dsf';
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$info['audio']['dataformat'] = 'dsf';
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$info['audio']['lossless'] = true;
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$info['audio']['bitrate_mode'] = 'cbr';
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$this->fseek($info['avdataoffset']);
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$dsfheader = $this->fread(28 + 12);
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$headeroffset = 0;
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$info['dsf']['dsd']['magic'] = substr($dsfheader, $headeroffset, 4);
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$headeroffset += 4;
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$magic = 'DSD ';
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if ($info['dsf']['dsd']['magic'] != $magic) {
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$this->error('Expecting "'.getid3_lib::PrintHexBytes($magic).'" at offset '.$info['avdataoffset'].', found "'.getid3_lib::PrintHexBytes($info['dsf']['dsd']['magic']).'"');
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unset($info['fileformat']);
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unset($info['audio']);
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unset($info['dsf']);
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return false;
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}
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$info['dsf']['dsd']['dsd_chunk_size'] = getid3_lib::LittleEndian2Int(substr($dsfheader, $headeroffset, 8)); // should be 28
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$headeroffset += 8;
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$info['dsf']['dsd']['dsf_file_size'] = getid3_lib::LittleEndian2Int(substr($dsfheader, $headeroffset, 8));
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$headeroffset += 8;
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$info['dsf']['dsd']['meta_chunk_offset'] = getid3_lib::LittleEndian2Int(substr($dsfheader, $headeroffset, 8));
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$headeroffset += 8;
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$info['dsf']['fmt']['magic'] = substr($dsfheader, $headeroffset, 4);
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$headeroffset += 4;
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$magic = 'fmt ';
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if ($info['dsf']['fmt']['magic'] != $magic) {
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$this->error('Expecting "'.getid3_lib::PrintHexBytes($magic).'" at offset '.$headeroffset.', found "'.getid3_lib::PrintHexBytes($info['dsf']['fmt']['magic']).'"');
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return false;
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}
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$info['dsf']['fmt']['fmt_chunk_size'] = getid3_lib::LittleEndian2Int(substr($dsfheader, $headeroffset, 8)); // usually 52 bytes
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$headeroffset += 8;
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$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.
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if (strlen($dsfheader) != ($info['dsf']['dsd']['dsd_chunk_size'] + $info['dsf']['fmt']['fmt_chunk_size'] + 12)) {
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$this->error('Expecting '.($info['dsf']['dsd']['dsd_chunk_size'] + $info['dsf']['fmt']['fmt_chunk_size']).' bytes header, found '.strlen($dsfheader).' bytes');
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return false;
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}
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$info['dsf']['fmt']['format_version'] = getid3_lib::LittleEndian2Int(substr($dsfheader, $headeroffset, 4)); // usually "1"
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$headeroffset += 4;
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$info['dsf']['fmt']['format_id'] = getid3_lib::LittleEndian2Int(substr($dsfheader, $headeroffset, 4)); // usually "0" = "DSD Raw"
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$headeroffset += 4;
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$info['dsf']['fmt']['channel_type_id'] = getid3_lib::LittleEndian2Int(substr($dsfheader, $headeroffset, 4));
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$headeroffset += 4;
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$info['dsf']['fmt']['channels'] = getid3_lib::LittleEndian2Int(substr($dsfheader, $headeroffset, 4));
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$headeroffset += 4;
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$info['dsf']['fmt']['sample_rate'] = getid3_lib::LittleEndian2Int(substr($dsfheader, $headeroffset, 4));
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$headeroffset += 4;
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$info['dsf']['fmt']['bits_per_sample'] = getid3_lib::LittleEndian2Int(substr($dsfheader, $headeroffset, 4));
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$headeroffset += 4;
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$info['dsf']['fmt']['sample_count'] = getid3_lib::LittleEndian2Int(substr($dsfheader, $headeroffset, 8));
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$headeroffset += 8;
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$info['dsf']['fmt']['channel_block_size'] = getid3_lib::LittleEndian2Int(substr($dsfheader, $headeroffset, 4));
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$headeroffset += 4;
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$info['dsf']['fmt']['reserved'] = getid3_lib::LittleEndian2Int(substr($dsfheader, $headeroffset, 4)); // zero-filled
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$headeroffset += 4;
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$info['dsf']['data']['magic'] = substr($dsfheader, $headeroffset, 4);
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$headeroffset += 4;
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$magic = 'data';
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if ($info['dsf']['data']['magic'] != $magic) {
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$this->error('Expecting "'.getid3_lib::PrintHexBytes($magic).'" at offset '.$headeroffset.', found "'.getid3_lib::PrintHexBytes($info['dsf']['data']['magic']).'"');
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return false;
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}
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$info['dsf']['data']['data_chunk_size'] = getid3_lib::LittleEndian2Int(substr($dsfheader, $headeroffset, 8));
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$headeroffset += 8;
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$info['avdataoffset'] = $headeroffset;
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$info['avdataend'] = $info['avdataoffset'] + $info['dsf']['data']['data_chunk_size'];
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if ($info['dsf']['dsd']['meta_chunk_offset'] > 0) {
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$getid3_id3v2 = new getid3_id3v2($this->getid3);
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$getid3_id3v2->StartingOffset = $info['dsf']['dsd']['meta_chunk_offset'];
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$getid3_id3v2->Analyze();
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unset($getid3_id3v2);
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}
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$info['dsf']['fmt']['channel_type'] = $this->DSFchannelTypeLookup($info['dsf']['fmt']['channel_type_id']);
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$info['audio']['channelmode'] = $info['dsf']['fmt']['channel_type'];
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$info['audio']['bits_per_sample'] = $info['dsf']['fmt']['bits_per_sample'];
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$info['audio']['sample_rate'] = $info['dsf']['fmt']['sample_rate'];
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$info['audio']['channels'] = $info['dsf']['fmt']['channels'];
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$info['audio']['bitrate'] = $info['audio']['bits_per_sample'] * $info['audio']['sample_rate'] * $info['audio']['channels'];
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$info['playtime_seconds'] = getid3_lib::SafeDiv($info['dsf']['data']['data_chunk_size'] * 8, $info['audio']['bitrate']);
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return true;
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}
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/**
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* @param int $channel_type_id
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*
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* @return string
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*/
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public static function DSFchannelTypeLookup($channel_type_id) {
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static $DSFchannelTypeLookup = array(
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// interleaving order:
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1 => 'mono', // 1: Mono
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2 => 'stereo', // 1: Front-Left; 2: Front-Right
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3 => '3-channel', // 1: Front-Left; 2: Front-Right; 3: Center
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4 => 'quad', // 1: Front-Left; 2: Front-Right; 3: Back-Left; 4: Back-Right
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5 => '4-channel', // 1: Front-Left; 2: Front-Right; 3: Center; 4: Low-Frequency
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6 => '5-channel', // 1: Front-Left; 2: Front-Right; 3: Center; 4: Back-Left 5: Back-Right
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7 => '5.1', // 1: Front-Left; 2: Front-Right; 3: Center; 4: Low-Frequency; 5: Back-Left; 6: Back-Right
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);
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return (isset($DSFchannelTypeLookup[$channel_type_id]) ? $DSFchannelTypeLookup[$channel_type_id] : '');
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}
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}
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