html - Make mp3 seekable PHP

Question

I did this PHP script

    $file_name = 'sample.mp3';

    header('Content-Type: audio/mpeg');

    $opts     = array('http' =>
                      array(
                          'method'           => 'GET',
                          'protocol_version' => 1.1,
                      )
    );
    $context  = stream_context_create($opts);
    $stream   = fopen($file_name, 'rb', FALSE, $context);
    $metadata = stream_get_meta_data($stream);
    $data     = stream_get_contents($stream);
    print($data);
    fclose($stream);

It could stream mp3 media successfully but I'm not able to seek the mp3 file that get played also in html5 video tags are not able to extract metadata from it, please tell me where I'm doing wrong and how to make this process work, thanks

Answer 1

Here try this, supports partial downloads and seeking for any filesize, also now correctly works in chrome:

<?php 
$file_name = './sample.mp3';
stream($file_name, 'audio/mpeg');

/**
 * Stream-able file handler
 *
 * @param String $file_location
 * @param Header|String $content_type
 * @return content
 */
function stream($file, $content_type = 'application/octet-stream') {
    @error_reporting(0);

    // Make sure the files exists, otherwise we are wasting our time
    if (!file_exists($file)) {
        header("HTTP/1.1 404 Not Found");
        exit;
    }

    // Get file size
    $filesize = sprintf("%u", filesize($file));

    // Handle 'Range' header
    if(isset($_SERVER['HTTP_RANGE'])){
        $range = $_SERVER['HTTP_RANGE'];
    }elseif($apache = apache_request_headers()){
        $headers = array();
        foreach ($apache as $header => $val){
            $headers[strtolower($header)] = $val;
        }
        if(isset($headers['range'])){
            $range = $headers['range'];
        }
        else $range = FALSE;
    } else $range = FALSE;

    //Is range
    if($range){
        $partial = true;
        list($param, $range) = explode('=',$range);
        // Bad request - range unit is not 'bytes'
        if(strtolower(trim($param)) != 'bytes'){ 
            header("HTTP/1.1 400 Invalid Request");
            exit;
        }
        // Get range values
        $range = explode(',',$range);
        $range = explode('-',$range[0]); 
        // Deal with range values
        if ($range[0] === ''){
            $end = $filesize - 1;
            $start = $end - intval($range[0]);
        } else if ($range[1] === '') {
            $start = intval($range[0]);
            $end = $filesize - 1;
        }else{ 
            // Both numbers present, return specific range
            $start = intval($range[0]);
            $end = intval($range[1]);
            if ($end >= $filesize || (!$start && (!$end || $end == ($filesize - 1)))) $partial = false; // Invalid range/whole file specified, return whole file
        }
        $length = $end - $start + 1;
    }
    // No range requested
    else $partial = false; 

    // Send standard headers
    header("Content-Type: $content_type");
    header("Content-Length: " . ($partial ? $length : $filesize));
    header('Accept-Ranges: bytes');

    // send extra headers for range handling...
    if ($partial) {
        header('HTTP/1.1 206 Partial Content');
        header("Content-Range: bytes $start-$end/$filesize");
        if (!$fp = fopen($file, 'rb')) {
            header("HTTP/1.1 500 Internal Server Error");
            exit;
        }
        if ($start) fseek($fp,$start);
        while($length){
            set_time_limit(0);
            $read = ($length > 8192) ? 8192 : $length;
            $length -= $read;
            print(fread($fp,$read));
        }
        fclose($fp);
    }
    //just send the whole file
    else readfile($file);
    exit;
}
?>