224 lines
8.8 KiB
PHP
224 lines
8.8 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 http://getid3.sourceforge.net //
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// or http://www.getid3.org //
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/////////////////////////////////////////////////////////////////
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// See readme.txt for more details //
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/////////////////////////////////////////////////////////////////
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// //
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// module.audio.nsv.php //
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// module for analyzing Nullsoft NSV files //
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// dependencies: NONE //
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// ///
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/////////////////////////////////////////////////////////////////
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class getid3_nsv extends getid3_handler
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{
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public function Analyze() {
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$info = &$this->getid3->info;
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fseek($this->getid3->fp, $info['avdataoffset'], SEEK_SET);
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$NSVheader = fread($this->getid3->fp, 4);
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switch ($NSVheader) {
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case 'NSVs':
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if ($this->getNSVsHeaderFilepointer(0)) {
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$info['fileformat'] = 'nsv';
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$info['audio']['dataformat'] = 'nsv';
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$info['video']['dataformat'] = 'nsv';
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$info['audio']['lossless'] = false;
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$info['video']['lossless'] = false;
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}
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break;
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case 'NSVf':
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if ($this->getNSVfHeaderFilepointer(0)) {
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$info['fileformat'] = 'nsv';
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$info['audio']['dataformat'] = 'nsv';
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$info['video']['dataformat'] = 'nsv';
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$info['audio']['lossless'] = false;
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$info['video']['lossless'] = false;
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$this->getNSVsHeaderFilepointer($info['nsv']['NSVf']['header_length']);
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}
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break;
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default:
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$info['error'][] = 'Expecting "NSVs" or "NSVf" at offset '.$info['avdataoffset'].', found "'.getid3_lib::PrintHexBytes($NSVheader).'"';
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return false;
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break;
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}
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if (!isset($info['nsv']['NSVf'])) {
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$info['warning'][] = 'NSVf header not present - cannot calculate playtime or bitrate';
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}
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return true;
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}
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public function getNSVsHeaderFilepointer($fileoffset) {
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$info = &$this->getid3->info;
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fseek($this->getid3->fp, $fileoffset, SEEK_SET);
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$NSVsheader = fread($this->getid3->fp, 28);
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$offset = 0;
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$info['nsv']['NSVs']['identifier'] = substr($NSVsheader, $offset, 4);
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$offset += 4;
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if ($info['nsv']['NSVs']['identifier'] != 'NSVs') {
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$info['error'][] = 'expected "NSVs" at offset ('.$fileoffset.'), found "'.$info['nsv']['NSVs']['identifier'].'" instead';
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unset($info['nsv']['NSVs']);
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return false;
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}
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$info['nsv']['NSVs']['offset'] = $fileoffset;
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$info['nsv']['NSVs']['video_codec'] = substr($NSVsheader, $offset, 4);
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$offset += 4;
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$info['nsv']['NSVs']['audio_codec'] = substr($NSVsheader, $offset, 4);
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$offset += 4;
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$info['nsv']['NSVs']['resolution_x'] = getid3_lib::LittleEndian2Int(substr($NSVsheader, $offset, 2));
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$offset += 2;
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$info['nsv']['NSVs']['resolution_y'] = getid3_lib::LittleEndian2Int(substr($NSVsheader, $offset, 2));
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$offset += 2;
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$info['nsv']['NSVs']['framerate_index'] = getid3_lib::LittleEndian2Int(substr($NSVsheader, $offset, 1));
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$offset += 1;
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//$info['nsv']['NSVs']['unknown1b'] = getid3_lib::LittleEndian2Int(substr($NSVsheader, $offset, 1));
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$offset += 1;
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//$info['nsv']['NSVs']['unknown1c'] = getid3_lib::LittleEndian2Int(substr($NSVsheader, $offset, 1));
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$offset += 1;
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//$info['nsv']['NSVs']['unknown1d'] = getid3_lib::LittleEndian2Int(substr($NSVsheader, $offset, 1));
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$offset += 1;
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//$info['nsv']['NSVs']['unknown2a'] = getid3_lib::LittleEndian2Int(substr($NSVsheader, $offset, 1));
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$offset += 1;
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//$info['nsv']['NSVs']['unknown2b'] = getid3_lib::LittleEndian2Int(substr($NSVsheader, $offset, 1));
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$offset += 1;
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//$info['nsv']['NSVs']['unknown2c'] = getid3_lib::LittleEndian2Int(substr($NSVsheader, $offset, 1));
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$offset += 1;
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//$info['nsv']['NSVs']['unknown2d'] = getid3_lib::LittleEndian2Int(substr($NSVsheader, $offset, 1));
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$offset += 1;
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switch ($info['nsv']['NSVs']['audio_codec']) {
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case 'PCM ':
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$info['nsv']['NSVs']['bits_channel'] = getid3_lib::LittleEndian2Int(substr($NSVsheader, $offset, 1));
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$offset += 1;
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$info['nsv']['NSVs']['channels'] = getid3_lib::LittleEndian2Int(substr($NSVsheader, $offset, 1));
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$offset += 1;
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$info['nsv']['NSVs']['sample_rate'] = getid3_lib::LittleEndian2Int(substr($NSVsheader, $offset, 2));
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$offset += 2;
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$info['audio']['sample_rate'] = $info['nsv']['NSVs']['sample_rate'];
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break;
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case 'MP3 ':
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case 'NONE':
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default:
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//$info['nsv']['NSVs']['unknown3'] = getid3_lib::LittleEndian2Int(substr($NSVsheader, $offset, 4));
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$offset += 4;
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break;
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}
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$info['video']['resolution_x'] = $info['nsv']['NSVs']['resolution_x'];
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$info['video']['resolution_y'] = $info['nsv']['NSVs']['resolution_y'];
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$info['nsv']['NSVs']['frame_rate'] = $this->NSVframerateLookup($info['nsv']['NSVs']['framerate_index']);
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$info['video']['frame_rate'] = $info['nsv']['NSVs']['frame_rate'];
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$info['video']['bits_per_sample'] = 24;
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$info['video']['pixel_aspect_ratio'] = (float) 1;
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return true;
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}
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public function getNSVfHeaderFilepointer($fileoffset, $getTOCoffsets=false) {
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$info = &$this->getid3->info;
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fseek($this->getid3->fp, $fileoffset, SEEK_SET);
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$NSVfheader = fread($this->getid3->fp, 28);
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$offset = 0;
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$info['nsv']['NSVf']['identifier'] = substr($NSVfheader, $offset, 4);
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$offset += 4;
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if ($info['nsv']['NSVf']['identifier'] != 'NSVf') {
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$info['error'][] = 'expected "NSVf" at offset ('.$fileoffset.'), found "'.$info['nsv']['NSVf']['identifier'].'" instead';
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unset($info['nsv']['NSVf']);
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return false;
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}
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$info['nsv']['NSVs']['offset'] = $fileoffset;
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$info['nsv']['NSVf']['header_length'] = getid3_lib::LittleEndian2Int(substr($NSVfheader, $offset, 4));
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$offset += 4;
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$info['nsv']['NSVf']['file_size'] = getid3_lib::LittleEndian2Int(substr($NSVfheader, $offset, 4));
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$offset += 4;
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if ($info['nsv']['NSVf']['file_size'] > $info['avdataend']) {
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$info['warning'][] = 'truncated file - NSVf header indicates '.$info['nsv']['NSVf']['file_size'].' bytes, file actually '.$info['avdataend'].' bytes';
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}
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$info['nsv']['NSVf']['playtime_ms'] = getid3_lib::LittleEndian2Int(substr($NSVfheader, $offset, 4));
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$offset += 4;
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$info['nsv']['NSVf']['meta_size'] = getid3_lib::LittleEndian2Int(substr($NSVfheader, $offset, 4));
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$offset += 4;
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$info['nsv']['NSVf']['TOC_entries_1'] = getid3_lib::LittleEndian2Int(substr($NSVfheader, $offset, 4));
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$offset += 4;
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$info['nsv']['NSVf']['TOC_entries_2'] = getid3_lib::LittleEndian2Int(substr($NSVfheader, $offset, 4));
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$offset += 4;
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if ($info['nsv']['NSVf']['playtime_ms'] == 0) {
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$info['error'][] = 'Corrupt NSV file: NSVf.playtime_ms == zero';
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return false;
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}
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$NSVfheader .= fread($this->getid3->fp, $info['nsv']['NSVf']['meta_size'] + (4 * $info['nsv']['NSVf']['TOC_entries_1']) + (4 * $info['nsv']['NSVf']['TOC_entries_2']));
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$NSVfheaderlength = strlen($NSVfheader);
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$info['nsv']['NSVf']['metadata'] = substr($NSVfheader, $offset, $info['nsv']['NSVf']['meta_size']);
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$offset += $info['nsv']['NSVf']['meta_size'];
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if ($getTOCoffsets) {
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$TOCcounter = 0;
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while ($TOCcounter < $info['nsv']['NSVf']['TOC_entries_1']) {
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if ($TOCcounter < $info['nsv']['NSVf']['TOC_entries_1']) {
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$info['nsv']['NSVf']['TOC_1'][$TOCcounter] = getid3_lib::LittleEndian2Int(substr($NSVfheader, $offset, 4));
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$offset += 4;
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$TOCcounter++;
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}
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}
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}
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if (trim($info['nsv']['NSVf']['metadata']) != '') {
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$info['nsv']['NSVf']['metadata'] = str_replace('`', "\x01", $info['nsv']['NSVf']['metadata']);
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$CommentPairArray = explode("\x01".' ', $info['nsv']['NSVf']['metadata']);
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foreach ($CommentPairArray as $CommentPair) {
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if (strstr($CommentPair, '='."\x01")) {
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list($key, $value) = explode('='."\x01", $CommentPair, 2);
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$info['nsv']['comments'][strtolower($key)][] = trim(str_replace("\x01", '', $value));
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}
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}
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}
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$info['playtime_seconds'] = $info['nsv']['NSVf']['playtime_ms'] / 1000;
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$info['bitrate'] = ($info['nsv']['NSVf']['file_size'] * 8) / $info['playtime_seconds'];
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return true;
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}
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public static function NSVframerateLookup($framerateindex) {
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if ($framerateindex <= 127) {
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return (float) $framerateindex;
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}
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static $NSVframerateLookup = array();
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if (empty($NSVframerateLookup)) {
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$NSVframerateLookup[129] = (float) 29.970;
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$NSVframerateLookup[131] = (float) 23.976;
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$NSVframerateLookup[133] = (float) 14.985;
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$NSVframerateLookup[197] = (float) 59.940;
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$NSVframerateLookup[199] = (float) 47.952;
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}
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return (isset($NSVframerateLookup[$framerateindex]) ? $NSVframerateLookup[$framerateindex] : false);
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}
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}
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