/lib/getid3/module.audio-video.nsv.php
PHP | 210 lines | 138 code | 51 blank | 21 comment | 19 complexity | 92d2deeeb14bf80976aaac9fec9eaa08 MD5 | raw file
Possible License(s): LGPL-2.1
- <?php
- // +----------------------------------------------------------------------+
- // | PHP version 5 |
- // +----------------------------------------------------------------------+
- // | Copyright (c) 2002-2006 James Heinrich, Allan Hansen |
- // +----------------------------------------------------------------------+
- // | This source file is subject to version 2 of the GPL license, |
- // | that is bundled with this package in the file license.txt and is |
- // | available through the world-wide-web at the following url: |
- // | http://www.gnu.org/copyleft/gpl.html |
- // +----------------------------------------------------------------------+
- // | getID3() - http://getid3.sourceforge.net or http://www.getid3.org |
- // +----------------------------------------------------------------------+
- // | Authors: James Heinrich <info?getid3*org> |
- // | Allan Hansen <ah?artemis*dk> |
- // +----------------------------------------------------------------------+
- // | module.audio-video.nsv.php |
- // | module for analyzing Nullsoft NSV files |
- // | dependencies: NONE |
- // +----------------------------------------------------------------------+
- //
- // $Id: module.audio-video.nsv.php,v 1.3 2006/11/02 10:48:00 ah Exp $
-
-
- class getid3_nsv extends getid3_handler
- {
- public function Analyze() {
- $getid3 = $this->getid3;
- $getid3->info['fileformat'] = 'nsv';
- $getid3->info['audio']['dataformat'] = 'nsv';
- $getid3->info['video']['dataformat'] = 'nsv';
- $getid3->info['audio']['lossless'] = false;
- $getid3->info['video']['lossless'] = false;
- fseek($getid3->fp, $getid3->info['avdataoffset'], SEEK_SET);
- $nsv_header = fread($getid3->fp, 4);
- switch ($nsv_header) {
-
- case 'NSVs':
- $this->getNSVsHeader();
- break;
- case 'NSVf':
- if ($this->getNSVfHeader()) {
- $this->getNSVsHeader($getid3->info['nsv']['NSVf']['header_length']);
- }
- break;
- default:
- throw new getid3_exception('Expecting "NSVs" or "NSVf" at offset '.$getid3->info['avdataoffset'].', found "'.$nsv_header.'"');
- break;
- }
- if (!isset($getid3->info['nsv']['NSVf'])) {
- $getid3->warning('NSVf header not present - cannot calculate playtime or bitrate');
- }
- return true;
- }
- private function getNSVsHeader($file_offset = 0) {
-
- $getid3 = $this->getid3;
-
- fseek($getid3->fp, $file_offset, SEEK_SET);
- $nsvs_header = fread($getid3->fp, 28);
-
- $getid3->info['nsv']['NSVs'] = array ();
- $info_nsv_NSVs = &$getid3->info['nsv']['NSVs'];
- $info_nsv_NSVs['identifier'] = substr($nsvs_header, 0, 4);
- if ($info_nsv_NSVs['identifier'] != 'NSVs') {
- throw new getid3_exception('expected "NSVs" at offset ('.$file_offset.'), found "'.$info_nsv_NSVs['identifier'].'" instead');
- }
-
- $info_nsv_NSVs['offset'] = $file_offset;
-
- getid3_lib::ReadSequence('LittleEndian2Int', $info_nsv_NSVs, $nsvs_header, 4,
- array (
- 'video_codec' => -4, // string
- 'audio_codec' => -4, // string
- 'resolution_x' => 2,
- 'resolution_y' => 2,
- 'framerate_index' => 1,
- )
- );
- if ($info_nsv_NSVs['audio_codec'] == 'PCM ') {
-
- getid3_lib::ReadSequence('LittleEndian2Int', $info_nsv_NSVs, $nsvs_header, 24,
- array (
- 'bits_channel' => 1,
- 'channels' => 1,
- 'sample_rate' => 2
- )
- );
- $getid3->info['audio']['sample_rate'] = $info_nsv_NSVs['sample_rate'];
-
- }
- $getid3->info['video']['resolution_x'] = $info_nsv_NSVs['resolution_x'];
- $getid3->info['video']['resolution_y'] = $info_nsv_NSVs['resolution_y'];
- $info_nsv_NSVs['frame_rate'] = getid3_nsv::NSVframerateLookup($info_nsv_NSVs['framerate_index']);
- $getid3->info['video']['frame_rate'] = $info_nsv_NSVs['frame_rate'];
- $getid3->info['video']['bits_per_sample'] = 24;
- $getid3->info['video']['pixel_aspect_ratio'] = (float)1;
- return true;
- }
- private function getNSVfHeader($file_offset = 0, $get_toc_offsets=false) {
-
- $getid3 = $this->getid3;
-
- fseek($getid3->fp, $file_offset, SEEK_SET);
- $nsvf_header = fread($getid3->fp, 28);
-
- $getid3->info['nsv']['NSVf'] = array ();
- $info_nsv_NSVf = &$getid3->info['nsv']['NSVf'];
-
- $info_nsv_NSVf['identifier'] = substr($nsvf_header, 0, 4);
- if ($info_nsv_NSVf['identifier'] != 'NSVf') {
- throw new getid3_exception('expected "NSVf" at offset ('.$file_offset.'), found "'.$info_nsv_NSVf['identifier'].'" instead');
- }
- $getid3->info['nsv']['NSVs']['offset'] = $file_offset;
- getid3_lib::ReadSequence('LittleEndian2Int', $info_nsv_NSVf, $nsvf_header, 4,
- array (
- 'header_length' => 4,
- 'file_size' => 4,
- 'playtime_ms' => 4,
- 'meta_size' => 4,
- 'TOC_entries_1' => 4,
- 'TOC_entries_2' => 4
- )
- );
-
- if ($info_nsv_NSVf['playtime_ms'] == 0) {
- throw new getid3_exception('Corrupt NSV file: NSVf.playtime_ms == zero');
- }
-
- if ($info_nsv_NSVf['file_size'] > $getid3->info['avdataend']) {
- $getid3->warning('truncated file - NSVf header indicates '.$info_nsv_NSVf['file_size'].' bytes, file actually '.$getid3->info['avdataend'].' bytes');
- }
- $nsvf_header .= fread($getid3->fp, $info_nsv_NSVf['meta_size'] + (4 * $info_nsv_NSVf['TOC_entries_1']) + (4 * $info_nsv_NSVf['TOC_entries_2']));
- $nsvf_headerlength = strlen($nsvf_header);
- $info_nsv_NSVf['metadata'] = substr($nsvf_header, 28, $info_nsv_NSVf['meta_size']);
- $offset = 28 + $info_nsv_NSVf['meta_size'];
- if ($get_toc_offsets) {
- $toc_counter = 0;
- while ($toc_counter < $info_nsv_NSVf['TOC_entries_1']) {
- if ($toc_counter < $info_nsv_NSVf['TOC_entries_1']) {
- $info_nsv_NSVf['TOC_1'][$toc_counter] = getid3_lib::LittleEndian2Int(substr($nsvf_header, $offset, 4));
- $offset += 4;
- $toc_counter++;
- }
- }
- }
- if (trim($info_nsv_NSVf['metadata']) != '') {
- $info_nsv_NSVf['metadata'] = str_replace('`', "\x01", $info_nsv_NSVf['metadata']);
- $comment_pair_array = explode("\x01".' ', $info_nsv_NSVf['metadata']);
- foreach ($comment_pair_array as $comment_pair) {
- if (strstr($comment_pair, '='."\x01")) {
- list($key, $value) = explode('='."\x01", $comment_pair, 2);
- $getid3->info['nsv']['comments'][strtolower($key)][] = trim(str_replace("\x01", '', $value));
- }
- }
- }
- $getid3->info['playtime_seconds'] = $info_nsv_NSVf['playtime_ms'] / 1000;
- $getid3->info['bitrate'] = ($info_nsv_NSVf['file_size'] * 8) / $getid3->info['playtime_seconds'];
- return true;
- }
- public static function NSVframerateLookup($frame_rate_index) {
-
- if ($frame_rate_index <= 127) {
- return (float)$frame_rate_index;
- }
- static $lookup = array (
- 129 => 29.970,
- 131 => 23.976,
- 133 => 14.985,
- 197 => 59.940,
- 199 => 47.952
- );
- return (isset($lookup[$frame_rate_index]) ? $lookup[$frame_rate_index] : false);
- }
- }
- ?>