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File: includes/getid3/module.audio-video.nsv.php

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  Classes of Karl Holz  >  WaldScan  >  includes/getid3/module.audio-video.nsv.php  >  Download  
File: includes/getid3/module.audio-video.nsv.php
Role: Auxiliary script
Content type: text/plain
Description: getID3 dependency
Class: WaldScan
Scan directories for files with certain extensions
Author: By
Last change:
Date: 2 years ago
Size: 9,032 bytes
 

Contents

Class file image Download
<?php
/////////////////////////////////////////////////////////////////
/// getID3() by James Heinrich <info@getid3.org> //
// available at http://getid3.sourceforge.net //
// or http://www.getid3.org //
/////////////////////////////////////////////////////////////////
// See readme.txt for more details //
/////////////////////////////////////////////////////////////////
// //
// module.audio.nsv.php //
// module for analyzing Nullsoft NSV files //
// dependencies: NONE //
// ///
/////////////////////////////////////////////////////////////////


class getid3_nsv extends getid3_handler
{

    function
Analyze() {
       
$info = &$this->getid3->info;

       
fseek($this->getid3->fp, $info['avdataoffset'], SEEK_SET);
       
$NSVheader = fread($this->getid3->fp, 4);

        switch (
$NSVheader) {
            case
'NSVs':
                if (
$this->getNSVsHeaderFilepointer(0)) {
                   
$info['fileformat'] = 'nsv';
                   
$info['audio']['dataformat'] = 'nsv';
                   
$info['video']['dataformat'] = 'nsv';
                   
$info['audio']['lossless'] = false;
                   
$info['video']['lossless'] = false;
                }
                break;

            case
'NSVf':
                if (
$this->getNSVfHeaderFilepointer(0)) {
                   
$info['fileformat'] = 'nsv';
                   
$info['audio']['dataformat'] = 'nsv';
                   
$info['video']['dataformat'] = 'nsv';
                   
$info['audio']['lossless'] = false;
                   
$info['video']['lossless'] = false;
                   
$this->getNSVsHeaderFilepointer($info['nsv']['NSVf']['header_length']);
                }
                break;

            default:
               
$info['error'][] = 'Expecting "NSVs" or "NSVf" at offset '.$info['avdataoffset'].', found "'.getid3_lib::PrintHexBytes($NSVheader).'"';
                return
false;
                break;
        }

        if (!isset(
$info['nsv']['NSVf'])) {
           
$info['warning'][] = 'NSVf header not present - cannot calculate playtime or bitrate';
        }

        return
true;
    }

    function
getNSVsHeaderFilepointer($fileoffset) {
       
$info = &$this->getid3->info;
       
fseek($this->getid3->fp, $fileoffset, SEEK_SET);
       
$NSVsheader = fread($this->getid3->fp, 28);
       
$offset = 0;

       
$info['nsv']['NSVs']['identifier'] = substr($NSVsheader, $offset, 4);
       
$offset += 4;

        if (
$info['nsv']['NSVs']['identifier'] != 'NSVs') {
           
$info['error'][] = 'expected "NSVs" at offset ('.$fileoffset.'), found "'.$info['nsv']['NSVs']['identifier'].'" instead';
            unset(
$info['nsv']['NSVs']);
            return
false;
        }

       
$info['nsv']['NSVs']['offset'] = $fileoffset;

       
$info['nsv']['NSVs']['video_codec'] = substr($NSVsheader, $offset, 4);
       
$offset += 4;
       
$info['nsv']['NSVs']['audio_codec'] = substr($NSVsheader, $offset, 4);
       
$offset += 4;
       
$info['nsv']['NSVs']['resolution_x'] = getid3_lib::LittleEndian2Int(substr($NSVsheader, $offset, 2));
       
$offset += 2;
       
$info['nsv']['NSVs']['resolution_y'] = getid3_lib::LittleEndian2Int(substr($NSVsheader, $offset, 2));
       
$offset += 2;

       
$info['nsv']['NSVs']['framerate_index'] = getid3_lib::LittleEndian2Int(substr($NSVsheader, $offset, 1));
       
$offset += 1;
       
//$info['nsv']['NSVs']['unknown1b'] = getid3_lib::LittleEndian2Int(substr($NSVsheader, $offset, 1));
       
$offset += 1;
       
//$info['nsv']['NSVs']['unknown1c'] = getid3_lib::LittleEndian2Int(substr($NSVsheader, $offset, 1));
       
$offset += 1;
       
//$info['nsv']['NSVs']['unknown1d'] = getid3_lib::LittleEndian2Int(substr($NSVsheader, $offset, 1));
       
$offset += 1;
       
//$info['nsv']['NSVs']['unknown2a'] = getid3_lib::LittleEndian2Int(substr($NSVsheader, $offset, 1));
       
$offset += 1;
       
//$info['nsv']['NSVs']['unknown2b'] = getid3_lib::LittleEndian2Int(substr($NSVsheader, $offset, 1));
       
$offset += 1;
       
//$info['nsv']['NSVs']['unknown2c'] = getid3_lib::LittleEndian2Int(substr($NSVsheader, $offset, 1));
       
$offset += 1;
       
//$info['nsv']['NSVs']['unknown2d'] = getid3_lib::LittleEndian2Int(substr($NSVsheader, $offset, 1));
       
$offset += 1;

        switch (
$info['nsv']['NSVs']['audio_codec']) {
            case
'PCM ':
               
$info['nsv']['NSVs']['bits_channel'] = getid3_lib::LittleEndian2Int(substr($NSVsheader, $offset, 1));
               
$offset += 1;
               
$info['nsv']['NSVs']['channels'] = getid3_lib::LittleEndian2Int(substr($NSVsheader, $offset, 1));
               
$offset += 1;
               
$info['nsv']['NSVs']['sample_rate'] = getid3_lib::LittleEndian2Int(substr($NSVsheader, $offset, 2));
               
$offset += 2;

               
$info['audio']['sample_rate'] = $info['nsv']['NSVs']['sample_rate'];
                break;

            case
'MP3 ':
            case
'NONE':
            default:
               
//$info['nsv']['NSVs']['unknown3'] = getid3_lib::LittleEndian2Int(substr($NSVsheader, $offset, 4));
               
$offset += 4;
                break;
        }

       
$info['video']['resolution_x'] = $info['nsv']['NSVs']['resolution_x'];
       
$info['video']['resolution_y'] = $info['nsv']['NSVs']['resolution_y'];
       
$info['nsv']['NSVs']['frame_rate'] = $this->NSVframerateLookup($info['nsv']['NSVs']['framerate_index']);
       
$info['video']['frame_rate'] = $info['nsv']['NSVs']['frame_rate'];
       
$info['video']['bits_per_sample'] = 24;
       
$info['video']['pixel_aspect_ratio'] = (float) 1;

        return
true;
    }

    function
getNSVfHeaderFilepointer($fileoffset, $getTOCoffsets=false) {
       
$info = &$this->getid3->info;
       
fseek($this->getid3->fp, $fileoffset, SEEK_SET);
       
$NSVfheader = fread($this->getid3->fp, 28);
       
$offset = 0;

       
$info['nsv']['NSVf']['identifier'] = substr($NSVfheader, $offset, 4);
       
$offset += 4;

        if (
$info['nsv']['NSVf']['identifier'] != 'NSVf') {
           
$info['error'][] = 'expected "NSVf" at offset ('.$fileoffset.'), found "'.$info['nsv']['NSVf']['identifier'].'" instead';
            unset(
$info['nsv']['NSVf']);
            return
false;
        }

       
$info['nsv']['NSVs']['offset'] = $fileoffset;

       
$info['nsv']['NSVf']['header_length'] = getid3_lib::LittleEndian2Int(substr($NSVfheader, $offset, 4));
       
$offset += 4;
       
$info['nsv']['NSVf']['file_size'] = getid3_lib::LittleEndian2Int(substr($NSVfheader, $offset, 4));
       
$offset += 4;

        if (
$info['nsv']['NSVf']['file_size'] > $info['avdataend']) {
           
$info['warning'][] = 'truncated file - NSVf header indicates '.$info['nsv']['NSVf']['file_size'].' bytes, file actually '.$info['avdataend'].' bytes';
        }

       
$info['nsv']['NSVf']['playtime_ms'] = getid3_lib::LittleEndian2Int(substr($NSVfheader, $offset, 4));
       
$offset += 4;
       
$info['nsv']['NSVf']['meta_size'] = getid3_lib::LittleEndian2Int(substr($NSVfheader, $offset, 4));
       
$offset += 4;
       
$info['nsv']['NSVf']['TOC_entries_1'] = getid3_lib::LittleEndian2Int(substr($NSVfheader, $offset, 4));
       
$offset += 4;
       
$info['nsv']['NSVf']['TOC_entries_2'] = getid3_lib::LittleEndian2Int(substr($NSVfheader, $offset, 4));
       
$offset += 4;

        if (
$info['nsv']['NSVf']['playtime_ms'] == 0) {
           
$info['error'][] = 'Corrupt NSV file: NSVf.playtime_ms == zero';
            return
false;
        }

       
$NSVfheader .= fread($this->getid3->fp, $info['nsv']['NSVf']['meta_size'] + (4 * $info['nsv']['NSVf']['TOC_entries_1']) + (4 * $info['nsv']['NSVf']['TOC_entries_2']));
       
$NSVfheaderlength = strlen($NSVfheader);
       
$info['nsv']['NSVf']['metadata'] = substr($NSVfheader, $offset, $info['nsv']['NSVf']['meta_size']);
       
$offset += $info['nsv']['NSVf']['meta_size'];

        if (
$getTOCoffsets) {
           
$TOCcounter = 0;
            while (
$TOCcounter < $info['nsv']['NSVf']['TOC_entries_1']) {
                if (
$TOCcounter < $info['nsv']['NSVf']['TOC_entries_1']) {
                   
$info['nsv']['NSVf']['TOC_1'][$TOCcounter] = getid3_lib::LittleEndian2Int(substr($NSVfheader, $offset, 4));
                   
$offset += 4;
                   
$TOCcounter++;
                }
            }
        }

        if (
trim($info['nsv']['NSVf']['metadata']) != '') {
           
$info['nsv']['NSVf']['metadata'] = str_replace('`', "\x01", $info['nsv']['NSVf']['metadata']);
           
$CommentPairArray = explode("\x01".' ', $info['nsv']['NSVf']['metadata']);
            foreach (
$CommentPairArray as $CommentPair) {
                if (
strstr($CommentPair, '='."\x01")) {
                    list(
$key, $value) = explode('='."\x01", $CommentPair, 2);
                   
$info['nsv']['comments'][strtolower($key)][] = trim(str_replace("\x01", '', $value));
                }
            }
        }

       
$info['playtime_seconds'] = $info['nsv']['NSVf']['playtime_ms'] / 1000;
       
$info['bitrate'] = ($info['nsv']['NSVf']['file_size'] * 8) / $info['playtime_seconds'];

        return
true;
    }


    static function
NSVframerateLookup($framerateindex) {
        if (
$framerateindex <= 127) {
            return (float)
$framerateindex;
        }
        static
$NSVframerateLookup = array();
        if (empty(
$NSVframerateLookup)) {
           
$NSVframerateLookup[129] = (float) 29.970;
           
$NSVframerateLookup[131] = (float) 23.976;
           
$NSVframerateLookup[133] = (float) 14.985;
           
$NSVframerateLookup[197] = (float) 59.940;
           
$NSVframerateLookup[199] = (float) 47.952;
        }
        return (isset(
$NSVframerateLookup[$framerateindex]) ? $NSVframerateLookup[$framerateindex] : false);
    }

}


?>