function get_audio_data($track_id)
{
    global $basedir;
    if ($track_id == "current") {
        $track_id = get_current_track_id();
    }
    header('Content-Type: audio/mp3');
    $t_artist = get_db_track_info("artist", $track_id);
    $t_title = get_db_track_info("title", $track_id);
    $filename = $t_artist . " - " . $t_title . ".mp3";
    header("Content-Disposition: attachment; filename=\"" . $filename . "\"");
    // header("Content-Disposition: inline; filename=\"".$filename."\"");
    $ad_link = track_relative_path($track_id);
    $audio_file = $basedir . $ad_link;
    $fp = fopen($audio_file, "r");
    $inhalt = fread($fp, filesize($audio_file));
    fclose($fp);
    echo $inhalt;
}
function get_current_source_id()
{
    // used	// returns the sourceid / cddbid (tracks->sourceid, same as albums->cddbid) of the currently playing (or stopped) track
    // (get linked to the current album)
    $track_id = get_current_track_id();
    $query = "SELECT * FROM tracks WHERE id={$track_id}";
    $result = mysql_query($query) or die('Query failed: ' . mysql_error());
    $row = mysql_fetch_array($result, MYSQL_ASSOC);
    return $row["sourceid"];
}