[edit] Last updated: Fri, 23 Mar 2012

SWFMovie::streamMP3

(PHP 4 >= 4.3.3)

SWFMovie::streamMP3 — Streams a MP3 file

Opis

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

Ostrzeżenie

Ta funkcja jest w stadium EKSPERYMENTALNYM. Oznacza to, że zachowanie funkcji, jej nazwa, w zasadzie wszystko udokumentowane tutaj może zostać zmienione w przyszłych wersjach PHP bez wcześniejszego uprzedzenia. Używaj tej funkcji na własne ryzyko.

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.

Parametry

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

Zwracane wartości

Return number of frames.

Rejestr zmian

Wersja	Opis
5.2.0	`skip` added

Przykłady

Przykład #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

[edit] Last updated: Fri, 23 Mar 2012

add a note User Contributed Notes SWFMovie::streamMP3

aaronmason85 at gmail dot com 18-May-2009 09:44


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 09:30


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 07-Mar-2008 03:05


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





<?php


$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 09:54


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 20-Sep-2002 03:02


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





Use 





<?php


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


instead of


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


?>





I hope this is useful for you :)

mued at muetdhiver dot org 17-May-2001 09:39


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

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