index.php

<?php
//set variables
$settings = array(
    'name' => 'ElectroAddict',
    'genre' => 'Electronic',
    'url' => $_SERVER['HTTP_HOST'],
    'bitrate' => 160,
    'music_directory' => 'music/',
    'database_file' => 'music.db',
    'buffer_size' => 16384,
    'max_listen_time' => 14400,
    'randomize_seed' => 31337,
);

set_time_limit(0);
require_once 'getid3/getid3.php';
require_once 'includes/directoryIteratorSubclasses.php';
$getID3 = new getID3();

//load playlist
if (!file_exists($settings['database_file'])) {
    $filenames = array();

    $fileinfos = new RecursiveIteratorIterator(
        new FilesOnlyFilter(
            new VisibleOnlyFilter(
                new RecursiveDirectoryIterator(
                    $settings['music_directory'],
                    FilesystemIterator::SKIP_DOTS
                        | FilesystemIterator::UNIX_PATHS
                )
            )
        ),
        RecursiveIteratorIterator::LEAVES_ONLY,
        RecursiveIteratorIterator::CATCH_GET_CHILD
    );

    foreach ($fileinfos as $pathname => $fileinfo) {
        array_push($filenames, $fileinfos->getSubPathname());
    }

    foreach ($filenames as $filename) {
        $id3 = $getID3->analyze($settings['music_directory'].$filename);
        if ($id3['fileformat'] == 'mp3') {
            $playfile = array(
                'filename' => $filename,
                // 'filename' => $id3['filename'],
                'filesize' => $id3['filesize'],
                'playtime' => $id3['playtime_seconds'],
                'audiostart' => $id3['avdataoffset'],
                'audioend' => $id3['avdataend'],
                'audiolength' => $id3['avdataend'] - $id3['avdataoffset'],
                'artist' => $id3['tags']['id3v2']['artist'][0],
                'title' => $id3['tags']['id3v2']['title'][0],
            );
            if (empty($playfile['artist']) || empty($playfile['title'])) {
                list($playfile['artist'], $playfile['title']) = explode(' - ', substr($playfile['filename'], 0, -4));
            }
            $playfiles[] = $playfile;
        }
    }

    file_put_contents($settings['database_file'], serialize($playfiles));
} else {
    $playfiles = unserialize(file_get_contents($settings['database_file']));
}

//user agents
$icy_data = false;
foreach (array('iTunes', 'VLC', 'Winamp') as $agent) {
    if (substr($_SERVER['HTTP_USER_AGENT'], 0, strlen($agent)) == $agent) {
        $icy_data = true;
    }
}

//set playlist
$start_time = microtime(true);
srand($settings['randomize_seed']);
shuffle($playfiles);

//sum playtime
foreach ($playfiles as $playfile) {
    $total_playtime += $playfile['playtime'];
}

//calculate the current song
$play_pos = $start_time % $total_playtime;
foreach ($playfiles as $i => $playfile) {
    $play_sum += $playfile['playtime'];
    if ($play_sum > $play_pos) {
        break;
    }
}
$track_pos = ($playfiles[$i]['playtime'] - $play_sum + $play_pos) * $playfiles[$i]['audiolength'] / $playfiles[$i]['playtime'];

//output headers
header('Content-type: audio/mpeg');
if ($icy_data) {
    header('icy-name: '.$settings['name']);
    header('icy-genre: '.$settings['genre']);
    header('icy-url: '.$settings['url']);
    header('icy-metaint: '.$settings['buffer_size']);
    header('icy-br: '.$settings['bitrate']);
    header('Content-Length: '.$settings['max_listen_time'] * $settings['bitrate'] * 128); //suppreses chuncked transfer-encoding
}

//play content
$o = $i;
$old_buffer = substr(file_get_contents($settings['music_directory'].$playfiles[$i]['filename']), $playfiles[$i]['audiostart'] + $track_pos, $playfiles[$i]['audiolength'] - $track_pos);
while (time() - $start_time < $settings['max_listen_time']) {
    $i = ++$i % count($playfiles);
    $buffer = $old_buffer.substr(file_get_contents($settings['music_directory'].$playfiles[$i]['filename']), $playfiles[$i]['audiostart'], $playfiles[$i]['audiolength']);

    for ($j = 0; $j < floor(strlen($buffer) / $settings['buffer_size']); ++$j) {
        if ($icy_data) {
            if ($i == $o + 1 && ($j * $settings['buffer_size']) <= strlen($old_buffer)) {
                $payload = "StreamTitle='{$playfiles[$o]['artist']} - {$playfiles[$o]['title']}';".chr(0);
            } else {
                $payload = "StreamTitle='{$playfiles[$i]['artist']} - {$playfiles[$i]['title']}';".chr(0);
            }

            $metadata = chr(ceil(strlen($payload) / 16)).$payload.str_repeat(chr(0), 16 - (strlen($payload) % 16));
        }
        echo substr($buffer, $j * $settings['buffer_size'], $settings['buffer_size']).$metadata;
    }
    $o = $i;
    $old_buffer = substr($buffer, $j * $settings['buffer_size']);
}