mirror of
https://github.com/Yetangitu/ampache
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210 lines
No EOL
8.1 KiB
PHP
210 lines
No EOL
8.1 KiB
PHP
<?php
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// +----------------------------------------------------------------------+
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// | PHP version 5 |
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// +----------------------------------------------------------------------+
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// | Copyright (c) 2002-2006 James Heinrich, Allan Hansen |
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// +----------------------------------------------------------------------+
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// | This source file is subject to version 2 of the GPL license, |
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// | that is bundled with this package in the file license.txt and is |
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// | available through the world-wide-web at the following url: |
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// | http://www.gnu.org/copyleft/gpl.html |
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// +----------------------------------------------------------------------+
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// | getID3() - http://getid3.sourceforge.net or http://www.getid3.org |
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// +----------------------------------------------------------------------+
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// | Authors: James Heinrich <infoØgetid3*org> |
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// | Allan Hansen <ahØartemis*dk> |
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// +----------------------------------------------------------------------+
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// | module.audio-video.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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// $Id: module.audio-video.nsv.php,v 1.3 2006/11/02 10:48:00 ah Exp $
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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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$getid3 = $this->getid3;
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$getid3->info['fileformat'] = 'nsv';
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$getid3->info['audio']['dataformat'] = 'nsv';
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$getid3->info['video']['dataformat'] = 'nsv';
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$getid3->info['audio']['lossless'] = false;
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$getid3->info['video']['lossless'] = false;
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fseek($getid3->fp, $getid3->info['avdataoffset'], SEEK_SET);
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$nsv_header = fread($getid3->fp, 4);
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switch ($nsv_header) {
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case 'NSVs':
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$this->getNSVsHeader();
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break;
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case 'NSVf':
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if ($this->getNSVfHeader()) {
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$this->getNSVsHeader($getid3->info['nsv']['NSVf']['header_length']);
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}
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break;
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default:
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throw new getid3_exception('Expecting "NSVs" or "NSVf" at offset '.$getid3->info['avdataoffset'].', found "'.$nsv_header.'"');
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break;
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}
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if (!isset($getid3->info['nsv']['NSVf'])) {
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$getid3->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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private function getNSVsHeader($file_offset = 0) {
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$getid3 = $this->getid3;
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fseek($getid3->fp, $file_offset, SEEK_SET);
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$nsvs_header = fread($getid3->fp, 28);
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$getid3->info['nsv']['NSVs'] = array ();
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$info_nsv_NSVs = &$getid3->info['nsv']['NSVs'];
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$info_nsv_NSVs['identifier'] = substr($nsvs_header, 0, 4);
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if ($info_nsv_NSVs['identifier'] != 'NSVs') {
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throw new getid3_exception('expected "NSVs" at offset ('.$file_offset.'), found "'.$info_nsv_NSVs['identifier'].'" instead');
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}
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$info_nsv_NSVs['offset'] = $file_offset;
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getid3_lib::ReadSequence('LittleEndian2Int', $info_nsv_NSVs, $nsvs_header, 4,
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array (
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'video_codec' => -4, // string
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'audio_codec' => -4, // string
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'resolution_x' => 2,
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'resolution_y' => 2,
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'framerate_index' => 1,
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)
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);
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if ($info_nsv_NSVs['audio_codec'] == 'PCM ') {
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getid3_lib::ReadSequence('LittleEndian2Int', $info_nsv_NSVs, $nsvs_header, 24,
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array (
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'bits_channel' => 1,
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'channels' => 1,
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'sample_rate' => 2
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)
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);
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$getid3->info['audio']['sample_rate'] = $info_nsv_NSVs['sample_rate'];
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}
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$getid3->info['video']['resolution_x'] = $info_nsv_NSVs['resolution_x'];
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$getid3->info['video']['resolution_y'] = $info_nsv_NSVs['resolution_y'];
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$info_nsv_NSVs['frame_rate'] = getid3_nsv::NSVframerateLookup($info_nsv_NSVs['framerate_index']);
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$getid3->info['video']['frame_rate'] = $info_nsv_NSVs['frame_rate'];
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$getid3->info['video']['bits_per_sample'] = 24;
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$getid3->info['video']['pixel_aspect_ratio'] = (float)1;
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return true;
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}
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private function getNSVfHeader($file_offset = 0, $get_toc_offsets=false) {
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$getid3 = $this->getid3;
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fseek($getid3->fp, $file_offset, SEEK_SET);
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$nsvf_header = fread($getid3->fp, 28);
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$getid3->info['nsv']['NSVf'] = array ();
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$info_nsv_NSVf = &$getid3->info['nsv']['NSVf'];
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$info_nsv_NSVf['identifier'] = substr($nsvf_header, 0, 4);
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if ($info_nsv_NSVf['identifier'] != 'NSVf') {
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throw new getid3_exception('expected "NSVf" at offset ('.$file_offset.'), found "'.$info_nsv_NSVf['identifier'].'" instead');
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}
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$getid3->info['nsv']['NSVs']['offset'] = $file_offset;
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getid3_lib::ReadSequence('LittleEndian2Int', $info_nsv_NSVf, $nsvf_header, 4,
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array (
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'header_length' => 4,
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'file_size' => 4,
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'playtime_ms' => 4,
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'meta_size' => 4,
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'TOC_entries_1' => 4,
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'TOC_entries_2' => 4
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)
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);
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if ($info_nsv_NSVf['playtime_ms'] == 0) {
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throw new getid3_exception('Corrupt NSV file: NSVf.playtime_ms == zero');
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}
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if ($info_nsv_NSVf['file_size'] > $getid3->info['avdataend']) {
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$getid3->warning('truncated file - NSVf header indicates '.$info_nsv_NSVf['file_size'].' bytes, file actually '.$getid3->info['avdataend'].' bytes');
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}
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$nsvf_header .= fread($getid3->fp, $info_nsv_NSVf['meta_size'] + (4 * $info_nsv_NSVf['TOC_entries_1']) + (4 * $info_nsv_NSVf['TOC_entries_2']));
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$nsvf_headerlength = strlen($nsvf_header);
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$info_nsv_NSVf['metadata'] = substr($nsvf_header, 28, $info_nsv_NSVf['meta_size']);
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$offset = 28 + $info_nsv_NSVf['meta_size'];
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if ($get_toc_offsets) {
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$toc_counter = 0;
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while ($toc_counter < $info_nsv_NSVf['TOC_entries_1']) {
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if ($toc_counter < $info_nsv_NSVf['TOC_entries_1']) {
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$info_nsv_NSVf['TOC_1'][$toc_counter] = getid3_lib::LittleEndian2Int(substr($nsvf_header, $offset, 4));
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$offset += 4;
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$toc_counter++;
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}
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}
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}
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if (trim($info_nsv_NSVf['metadata']) != '') {
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$info_nsv_NSVf['metadata'] = str_replace('`', "\x01", $info_nsv_NSVf['metadata']);
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$comment_pair_array = explode("\x01".' ', $info_nsv_NSVf['metadata']);
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foreach ($comment_pair_array as $comment_pair) {
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if (strstr($comment_pair, '='."\x01")) {
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list($key, $value) = explode('='."\x01", $comment_pair, 2);
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$getid3->info['nsv']['comments'][strtolower($key)][] = trim(str_replace("\x01", '', $value));
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}
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}
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}
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$getid3->info['playtime_seconds'] = $info_nsv_NSVf['playtime_ms'] / 1000;
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$getid3->info['bitrate'] = ($info_nsv_NSVf['file_size'] * 8) / $getid3->info['playtime_seconds'];
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return true;
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}
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public static function NSVframerateLookup($frame_rate_index) {
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if ($frame_rate_index <= 127) {
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return (float)$frame_rate_index;
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}
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static $lookup = array (
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129 => 29.970,
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131 => 23.976,
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133 => 14.985,
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197 => 59.940,
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199 => 47.952
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);
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return (isset($lookup[$frame_rate_index]) ? $lookup[$frame_rate_index] : false);
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}
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}
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?>
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