X-Git-Url: http://git.cyclocoop.org/?a=blobdiff_plain;f=www%2Fplugins-dist%2Fmedias%2Flib%2Fgetid3%2Fmodule.audio.dss.php;fp=www%2Fplugins-dist%2Fmedias%2Flib%2Fgetid3%2Fmodule.audio.dss.php;h=6bd96682796c9fbbcdb35b0efcb98201b9b7bb74;hb=4f443dce95ff6f8221c189880a70c74ce1c1f238;hp=0000000000000000000000000000000000000000;hpb=4a628e9b277d3617535f99d663ca79fa2e891177;p=lhc%2Fweb%2Fwww.git diff --git a/www/plugins-dist/medias/lib/getid3/module.audio.dss.php b/www/plugins-dist/medias/lib/getid3/module.audio.dss.php new file mode 100644 index 00000000..6bd96682 --- /dev/null +++ b/www/plugins-dist/medias/lib/getid3/module.audio.dss.php @@ -0,0 +1,99 @@ + // +// 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.dss.php // +// module for analyzing Digital Speech Standard (DSS) files // +// dependencies: NONE // +// /// +///////////////////////////////////////////////////////////////// + + +class getid3_dss extends getid3_handler +{ + + public function Analyze() { + $info = &$this->getid3->info; + + $this->fseek($info['avdataoffset']); + $DSSheader = $this->fread(1540); + + if (!preg_match('#^[\\x02-\\x06]ds[s2]#', $DSSheader)) { + $this->error('Expecting "[02-06] 64 73 [73|32]" at offset '.$info['avdataoffset'].', found "'.getid3_lib::PrintHexBytes(substr($DSSheader, 0, 4)).'"'); + return false; + } + + // some structure information taken from http://cpansearch.perl.org/src/RGIBSON/Audio-DSS-0.02/lib/Audio/DSS.pm + $info['encoding'] = 'ISO-8859-1'; // not certain, but assumed + $info['dss'] = array(); + + $info['fileformat'] = 'dss'; + $info['mime_type'] = 'audio/x-'.substr($DSSheader, 1, 3); // "audio/x-dss" or "audio/x-ds2" + $info['audio']['dataformat'] = substr($DSSheader, 1, 3); // "dss" or "ds2" + $info['audio']['bitrate_mode'] = 'cbr'; + + $info['dss']['version'] = ord(substr($DSSheader, 0, 1)); + $info['dss']['hardware'] = trim(substr($DSSheader, 12, 16)); // identification string for hardware used to create the file, e.g. "DPM 9600", "DS2400" + $info['dss']['unknown1'] = getid3_lib::LittleEndian2Int(substr($DSSheader, 28, 4)); + // 32-37 = "FE FF FE FF F7 FF" in all the sample files I've seen + $info['dss']['date_create_unix'] = $this->DSSdateStringToUnixDate(substr($DSSheader, 38, 12)); + $info['dss']['date_complete_unix'] = $this->DSSdateStringToUnixDate(substr($DSSheader, 50, 12)); + $info['dss']['playtime_sec'] = intval((substr($DSSheader, 62, 2) * 3600) + (substr($DSSheader, 64, 2) * 60) + substr($DSSheader, 66, 2)); // approximate file playtime in HHMMSS + if ($info['dss']['version'] <= 3) { + $info['dss']['playtime_ms'] = getid3_lib::LittleEndian2Int(substr($DSSheader, 512, 4)); // exact file playtime in milliseconds. Has also been observed at offset 530 in one sample file, with something else (unknown) at offset 512 + $info['dss']['priority'] = ord(substr($DSSheader, 793, 1)); + $info['dss']['comments'] = trim(substr($DSSheader, 798, 100)); + $info['dss']['sample_rate_index'] = ord(substr($DSSheader, 1538, 1)); // this isn't certain, this may or may not be where the sample rate info is stored, but it seems consistent on my small selection of sample files + $info['audio']['sample_rate'] = $this->DSSsampleRateLookup($info['dss']['sample_rate_index']); + } else { + $this->getid3->warning('DSS above version 3 not fully supported in this version of getID3. Any additional documentation or format specifications would be welcome. This file is version '.$info['dss']['version']); + } + + $info['audio']['bits_per_sample'] = 16; // maybe, maybe not -- most compressed audio formats don't have a fixed bits-per-sample value, but this is a reasonable approximation + $info['audio']['channels'] = 1; + + if (!empty($info['dss']['playtime_ms']) && (floor($info['dss']['playtime_ms'] / 1000) == $info['dss']['playtime_sec'])) { // *should* just be playtime_ms / 1000 but at least one sample file has playtime_ms at offset 530 instead of offset 512, so safety check + $info['playtime_seconds'] = $info['dss']['playtime_ms'] / 1000; + } else { + $info['playtime_seconds'] = $info['dss']['playtime_sec']; + if (!empty($info['dss']['playtime_ms'])) { + $this->getid3->warning('playtime_ms ('.number_format($info['dss']['playtime_ms'] / 1000, 3).') does not match playtime_sec ('.number_format($info['dss']['playtime_sec']).') - using playtime_sec value'); + } + } + $info['audio']['bitrate'] = ($info['filesize'] * 8) / $info['playtime_seconds']; + + return true; + } + + public function DSSdateStringToUnixDate($datestring) { + $y = substr($datestring, 0, 2); + $m = substr($datestring, 2, 2); + $d = substr($datestring, 4, 2); + $h = substr($datestring, 6, 2); + $i = substr($datestring, 8, 2); + $s = substr($datestring, 10, 2); + $y += (($y < 95) ? 2000 : 1900); + return mktime($h, $i, $s, $m, $d, $y); + } + + public function DSSsampleRateLookup($sample_rate_index) { + static $dssSampleRateLookup = array( + 0x0A => 16000, + 0x0C => 11025, + 0x0D => 12000, + 0x15 => 8000, + ); + if (!array_key_exists($sample_rate_index, $dssSampleRateLookup)) { + $this->getid3->warning('unknown sample_rate_index: 0x'.strtoupper(dechex($sample_rate_index))); + return false; + } + return $dssSampleRateLookup[$sample_rate_index]; + } + +}