Last updated: Fri, 20 Nov 2009

SWFMovie->streamMP3

(PHP 4 >= 4.3.3)

SWFMovie->streamMP3 — Streams a MP3 file

Description

SWFMovie

int streamMP3 ( mixed $mp3file [, float $skip = 0 ] )

Warning

This function is EXPERIMENTAL. The behaviour of this function, its name, and surrounding documentation may change without notice in a future release of PHP. This function should be used at your own risk.

Streams the given MP3 file mp3file .

This method is not very robust in dealing with oddities (can skip over an initial ID3 tag, but that's about it).

Note that the movie isn't smart enough to put enough frames in to contain the entire mp3 stream- you'll have to add (length of song * frames per second) frames to get the entire stream in.

Parameters

mp3file: Can be a file pointer returned by fopen() or the MP3 data, as a binary string.
skip: Number of seconds to skip.

Return Values

Return number of frames.

Changelog

Version	Description
5.2.0	`skip` added

Examples

Example #1 Streaming example


<?php
$m = new SWFMovie();
$m->setRate(12.0);
$m->streamMp3(file_get_contents("distortobass.mp3"));
// use your own MP3

// The file is 11.85 seconds at 12.0 fps = 142 frames
$m->setFrames(142);

header('Content-type: application/x-shockwave-flash');
$m->output();
?>

SWFMovie->writeExports

SWFMovie->stopSound

Last updated: Fri, 20 Nov 2009

add a note User Contributed Notes
SWFMovie->streamMP3

aaronmason85 at gmail dot com
19-May-2009 06:44


Hey all,





For those using Ming 0.3 (like me), there is a way to calculate the length of the MP3 you are using.  It might be a bit iffy for VBR files, but it seems to work well for the files I've tested thus far.  The process of calculating the frame length (and size) is detailed at http://www.mpgedit.org/mpgedit/mpeg_format/mpeghdr.htm





<?php





function get_mp3_len ($file) {





        $rate1=array(0, 32, 64, 96, 128, 160, 192, 224, 256, 288, 320, 352, 384, 416, 448, "bad");


        $rate2=array(0, 32, 48, 56, 64, 80, 96, 112, 128, 160, 192, 224, 256, 320, 384, "bad");


        $rate3=array(0, 32, 40, 48, 56, 64, 80, 96, 112, 128, 160, 192, 224, 256, 320, "bad");


        $rate4=array(0, 32, 48, 56, 64, 80, 96, 112, 128, 144, 160, 176, 192, 224, 256, "bad");


        $rate5=array(0, 8, 16, 24, 32, 40, 48, 56, 64, 80, 96, 112, 128, 144, 160, "bad");





        $bitrate=array(


                '1'  => $rate5,


                '2'  => $rate5,


                '3'  => $rate4,


                '9'  => $rate5,


                '10' => $rate5,


                '11' => $rate4,


                '13' => $rate3,


                '14' => $rate2,


                '15' => $rate1


        );





        $sample=array(


                '0'  => 11025,


                '1'  => 12000,


                '2'  => 8000,


                '8'  => 22050,


                '9'  => 24000,


                '10' => 16000,


                '12' => 44100,


                '13' => 48000,


                '14' => 32000


        );





        $fd=fopen($file, 'rb');


        $header=fgets($fd, 5);


        fclose($fd);





        $bits="";


        while (strlen($header) > 0) {





                //var_dump($header);


                $bits.=str_pad(base_convert(ord($header{0}), 10, 2), 8, '0', STR_PAD_LEFT);


                $header=substr($header, 1);


        }





        $bits=substr($bits, 11); // lets strip the frame sync bits first.





        $version=substr($bits, 0, 2); // this gives us the version


        $layer=base_convert(substr($bits, 2, 2), 2, 10); // this gives us the layer


        $verlay=base_convert(substr($bits, 0, 4), 2, 10); // this gives us both





        $rateidx=base_convert(substr($bits, 5, 4), 2, 10); // this gives us the bitrate index


        $sampidx=base_convert($version.substr($bits, 9, 2), 2, 10); // this gives the sample index


        $padding=substr($bits, 11, 1); // are we padding frames?





        $rate=$bitrate[$verlay][$rateidx];


        $samp=$sample[$sampidx];





        $framelen=0;


        $framesize=384; // Size of the frame in samples


        if ($layer == 3) { // layer 1?


                $framelen=(12 * ($rate * 1000) / $samp + $padding) * 4;


        } else { // Layer 2 and 3


                $framelen=144 * ($rate * 1000) / $samp + $padding;


                $framesize=1152;


        }





        $headerlen=4 + ($bits{4} == 0 ? '2' : '0');





        return (filesize($file) - $headerlen) / $framelen / ($samp / $framesize);


}





?>

Richard Trigaux
25-Feb-2009 06:30


Seems that this function only handles some MP3 files with specified sample rates and not others. 44100 and 21050 work. With the lame MP3 converter, this is obtained with setting the "bit rate" at 112 (average compression/quality), mono or stereo. Other values may work, probably multiples, I did not tried all.

diana
08-Mar-2008 12:05


If you need to play an mp3 fully you need to do something like:

$len = $m->streamMp3(fopen("sound.mp3", "r"));

$m->setFrames($len);



This works only in Ming 0.4. I'm not 100% sure but it doesn't sound to work on Ming 0.3

boreckiwebs at gmail dot com
24-Aug-2006 06:54


if you want to control the sound use these functions like this:



<?php



$m -> add(new SWFAction('

 stop(); // pauses the song

 goToAndStop(1); // stops the song, and goes back to the beginning

 play(); // plays the song from current position

'));



?>



i hope this is helpful

boo at php dot net
21-Sep-2002 12:02


Don't forget to use fopen function in example above !



Use 

$m->streamMp3(fopen("distortobass.mp3", "rb"));

instead of

$m->streamMp3("distortobass.mp3");



I hope this is useful for you :)

mued at muetdhiver dot org
18-May-2001 06:39


a nice feature to handle Id3tag is to get support from Unix mp3info command into a returning exec parsing

add a note

SWFMovie->writeExports

SWFMovie->stopSound

Last updated: Fri, 20 Nov 2009