File: sequencer.php

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File:	`???`
Role:	Example script
Content type:	`text/plain`
Description:	little online sequencer, 4 drum tracks, 4 instrument tracks, 1 bar only
Class:	MIDI Class Read, write and manipulate MIDI files and data
Author:	By Fluxus
Last change:	improved
Date:	21 years ago
Size:	`8,851 bytes`
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<?php


session_start();


$save_dir = 'tmp/sess_'.session_id().'/';





//clean up


$sessions = array();


$handle = opendir (session_save_path());


while (false !== ($file = readdir ($handle)))


    if ($file!='.' && $file!='..') $sessions[] = $file;


closedir($handle);


$handle = opendir('tmp/');


while (false !== ($dir = readdir ($handle)))


    if (is_dir($dir) && $dir!='.' && $dir!='..' && !in_array($dir,$sessions)) rm("tmp/$dir/");


closedir($handle);





// removes non-empty dir


function rm($dir){


    $handle = opendir($dir);


    while (false !== ($file = readdir ($handle)))


        if ($file!='.' && $file!='..') unlink("$dir/$file");


    closedir($handle);


    rmdir($dir);


}





if (!is_dir('tmp')) mkdir('tmp');


if (!is_dir($save_dir)) mkdir($save_dir);    





//---------------------------------------------


require('midi.class.php');





$midi = new Midi();





$instruments = $midi->getInstrumentList();


$drumset     = $midi->getDrumset();


$drumkit     = $midi->getDrumkitList();


$notes       = $midi->getNoteList();


//---------------------------------------------





$p=$_POST;$g=$_GET; //'cause I'm lazy





srand((double)microtime()*1000000);


$rand = rand();


$f = $rand.'.mid';


$file = $save_dir.$f;





if (isset($g['download'])){


    $file = $g['download'];


    $filename  = 'output.mid';


    $midi->downloadMidFile($file,$filename);


}





if (isset($p['publish'])){


    unset($p['plug']);


    if (isset($p['showTxt'])) unset($p['showTxt']);


    if (isset($p['showXml'])) unset($p['showXml']);


    


    $str = serialize($p);


    $m=fopen("mix/$rand.mix","wb");


    fwrite($m, $str);


    @fclose($m);


    echo "your mix has been published as $rand.mix!";


}





if (isset($g['mix'])){


    $mixfile = 'mix/'.$g['mix'];


    $m=fopen($mixfile,"r");


    $str = fread($m, filesize($mixfile));


    @fclose($m);


    $p = unserialize($str);


    $p['play'] = 1;


}





//DEFAULTS


$loop = isset($p['noloop'])?0:1;


$rep = isset($p['rep'])?$p['rep']:4;


$plug = isset($p['plug'])?$p['plug']:(isset($g['plug'])?$g['plug']:'wm');


$play = isset($p['play'])?1:0;


$bpm = isset($p['bpm'])?$p['bpm']:150;





$aktiv=array();


$inst=array();


$note=array();


$vol=array();





for ($k=1;$k<=8;$k++){


    $aktiv[$k] = isset($p["aktiv$k"])?1:0;


    $inst[$k] = isset($p["inst$k"])?$p["inst$k"]:0;


    $note[$k] = isset($p["note$k"])?$p["note$k"]:35;


    $vol[$k] = isset($p["vol$k"])?$p["vol$k"]:127;


}


//if (!isset($p['last'])) $aktiv[1]=1; //first call


?>





<html>


<head>


<meta http-equiv="content-type" content="text/html; charset=iso-8859-1" />


<title>Sequencer</title>


<style>


body {font-family:arial;font-size:11px;margin:5px;}


td {font-family:arial;font-size:11px}


select {font-family:arial;font-size:11px}


option {font-family:arial;font-size:11px}


input {font-family:arial;font-size:11px}


a,a:link,a:visited,a:active    {font-family:arial;font-size:11px;color:#000000;}


a:hover    {font-family:font-family:arial;font-size:11px;color:#666666;}


</style>


</head>


<body>


<form action="sequencer.php" method="POST" onsubmit="b=0;for(i=1;i<9;i++)b|=this['aktiv'+i].checked;if(b==0){alert('You have to activate at least one track!');return false};">


<input type="hidden" name="PHPSESSID" value="<?php echo session_id()?>">


<table border=0 cellpadding=2 cellspacing=0><tr><td>


<table border=0 cellpadding=2 cellspacing=0 bgcolor="#DADADA">





<!-- DRUMS -->


<tr bgcolor="#333333"><td>&nbsp;</td><td colspan=7 style="color:#FFFFFF"><b>Drum tracks</b></td></tr>


<tr bgcolor="#BBBBBB"><td align="center">on</td><td>instrument</td><td>drum kit</td><td>vol</td><td colspan=4>pattern</td></tr>


<?php


for ($k=1;$k<=4;$k++){


?>


<tr>


<td><input type="checkbox" name="aktiv<?php echo $k?>"<?php echo $aktiv[$k]?' checked':''?>></td>


<td>


<select name="note<?php echo $k?>">


<?php


    for ($i=0;$i<128;$i++)


        if (isset($drumset[$i]))


            echo '<OPTION value="'.$i.'"'.($note[$k]==$i?' selected':'').'>0'.$i.'&nbsp;&nbsp;'.$drumset[$i]."</OPTION>\n";


        else{


            $num = ($i<10)?"00$i":($i<100?"0$i":"$i");


            echo '<OPTION value="'.($i).'"'.($note[$k]==$i?' selected':'').'>'.$num."</OPTION>\n";


        };


?>


</select>


</td>


<td>


<select name="inst<?php echo $k?>">


<?php


    foreach ($drumkit as $key=>$val) echo "<option value=$key ".(($inst[$k]==$key)?' selected':'').">$val</option>\n";


?>


</select>


</td>


<td>


<select name="vol<?php echo $k?>">


<?php


    for ($i=127;$i>=0;$i--)


        echo "<OPTION value=\"$i\"".($vol[$k]==$i?' selected':'').">$i</OPTION>\n";


?>


</select>


</td>


<td bgcolor="#DADADA">


<?php


    for ($i=0;$i<16;$i++) {


        echo "<input type=\"checkbox\" name=\"n$k$i\"".(isset($p["n$k$i"])?' checked':'').">\n";


        if ($i<15&&$i%4==3) echo '</td><td'.($i%8==3?' bgcolor="#EEEEEE"':' bgcolor="#DADADA"').'>';


    }


}


?>


</td>


</tr>








<!-- INSTRUMENTS -->


<tr bgcolor="#333333"><td>&nbsp;</td><td colspan=7 style="color:#FFFFFF"><b>Instrument tracks</b></td></tr>


<tr bgcolor="#BBBBBB"><td align="center">on</td><td>instrument</td><td>note</td><td>vol</td><td colspan=4>pattern</td></tr>


<?php


for ($k=5;$k<=8;$k++){


?>


<tr>


<td><input type="checkbox" name="aktiv<?php echo $k?>"<?php echo $aktiv[$k]?' checked':''?>></td>


<td>


<select name="inst<?php echo $k?>">


<?php


    for ($i=0;$i<128;$i++){


        $num = ($i<10)?"00$i":($i<100?"0$i":"$i");


        echo '<OPTION value="'.($i).'"'.($inst[$k]==$i?' selected':'').'>'.$num.'&nbsp;&nbsp;'.$instruments[$i]."</OPTION>\n";


    }


?>


</select>


</td>


<td>


<select name="note<?php echo $k?>">


<?php


    for ($i=0;$i<128;$i++)


        echo '<OPTION value="'.($i).'"'.($note[$k]==$i?' selected':'').'>'.$notes[$i]."</OPTION>\n";


?>


</select>


</td>


<td>


<select name="vol<?php echo $k?>">


<?php


    for ($i=127;$i>=0;$i--)


        echo "<OPTION value=\"$i\"".($vol[$k]==$i?' selected':'').">$i</OPTION>\n";


?>


</select>


</td>


<td>


<?php


    for ($i=0;$i<16;$i++) {


        echo "<input type=\"checkbox\" name=\"n$k$i\"".(isset($p["n$k$i"])?' checked':'').">\n";


        if ($i<15&&$i%4==3) echo '</td><td'.($i%8==3?' bgcolor="#EEEEEE"':'').'>';


    }


}


?>


</td>


</tr>


<tr><td colspan=8 bgcolor="#FFFFFF">





<br><br>





<input type="text" name="bpm" size=3 value="<?php echo $bpm?>"> bpm<br>


<input type="text" name="rep" size=3 value="<?php echo $rep?>"> bar repetitions<br>


<input type="checkbox" name="noloop"<?php echo !$loop?' checked':''?>>don't loop<br>


<input type="radio" name="plug" value="bk"<?php echo $plug=='bk'?' checked':''?>>Beatnik


<input type="radio" name="plug" value="qt"<?php echo $plug=='qt'?' checked':''?>>QuickTime


<input type="radio" name="plug" value="wm"<?php echo $plug=='wm'?' checked':''?>>Windows Media


<input type="radio" name="plug" value="jv"<?php echo $plug=='jv'?' checked':''?>>Java Applet


<input type="radio" name="plug" value=""<?php echo $plug==''?' checked':''?>>other (default Player)


<br>


<input type="checkbox" name="showTxt"<?php echo isset($p['showTxt'])?' checked':''?>>show MIDI result as Text<br>


<input type="checkbox" name="showXml"<?php echo isset($p['showXml'])?' checked':''?>>show MIDI result as XML


<br><br>


<input type="submit" name="play" value=" PLAY! ">&nbsp;&nbsp;


<input type="submit" name="publish" value="Publish">&nbsp;&nbsp;<br><br>


</form>





<?php





if ($play){


    $midi->open(480); //timebase=480, quarter note=120


    $midi->setBpm($bpm);


    


    for ($k=1;$k<=8;$k++) if ($aktiv[$k]){        


        $ch = ($k<5)?10:$k;


        $inst = $p["inst$k"];


        $n = $p["note$k"];


        $v = $p["vol$k"];


        $t = 0;


        $ts = 0;


        $tn = $midi->newTrack() - 1;


        


        $midi->addMsg($tn, "0 PrCh ch=$ch p=$inst");


        for ($r=0;$r<$rep;$r++){


            for ($i=0;$i<16;$i++){


                if ($ts == $t+120) $midi->addMsg($tn, "$ts Off ch=$ch n=$n v=127");


                $midi->addMsg($tn, "$ts Off ch=$ch n=$n v=127");


                if (isset($p["n$k$i"])){


                    $t = $ts;


                    $midi->addMsg($tn, "$t On ch=$ch n=$n v=$v");


                }


                $ts += 120;


            }


            $midi->addMsg($tn, "$ts Off ch=$ch n=$n v=127");


        }


        $midi->addMsg($tn, "$ts Meta TrkEnd");


    }    


    $midi->saveMidFile($file);


    $midi->playMidFile($file,1,1,$loop,$plug);


?>    


    <br><br>


    <input type="button" name="download" value="Save as SMF (*.mid)" onClick="self.location.href='sequencer.php?download=<?php echo urlencode($file)?>'">


<?php


}


?>


</td></tr></table>


</td>


<td width=10>&nbsp;</td>


<td valign="top">





<table width=140 border=0 cellpadding=2 cellspacing=0 bgcolor="#DADADA">


<tr bgcolor="#333333"><td colspan=7 style="color:#FFFFFF"><b>Published Mixes</b></td></tr>


<tr><td>


<?php


$handle=opendir ('mix');


while (false !== ($file = readdir ($handle)))


    if ($file!='.' && $file!='..') echo "<a href=\"sequencer.php?mix=$file&plug=$plug\">$file</a><br>\n";


closedir($handle);


?>


<br>


</td></tr></table>





</td></tr></table>


<?php 


if (isset($p['showTxt'])) echo '<hr><pre>'.$midi->getTxt().'</pre>';


if (isset($p['showXml'])) echo '<hr><pre>'.htmlspecialchars($midi->getXml()).'</pre>';


?>


</body>


</html>
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File: sequencer.php

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