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File: getID3/demos/demo.joinmp3.php

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File: getID3/demos/demo.joinmp3.php
Role: Example script
Content type: text/plain
Description: Example script
Class: PHP Media File Info Library
Retrieve the details from a video or audio file
Author: By
Last change:
Date: 7 months ago
Size: 5,658 bytes
 

Contents

Class file image Download
<?php
/////////////////////////////////////////////////////////////////
/// getID3() by James Heinrich <info@getid3.org> //
// available at https://github.com/JamesHeinrich/getID3 //
// or https://www.getid3.org //
// or http://getid3.sourceforge.net //
// //
// /demo/demo.joinmp3.php - part of getID3() //
// Sample script for splicing two or more MP3s together into //
// one file. Does not attempt to fix VBR header frames. //
// Can also be used to extract portion from single file. //
// Note: all joined MP3s need to be the same sample rate. //
// see readme.txt for more details //
// ///
/////////////////////////////////////////////////////////////////

die('For security reasons, this demo has been disabled. It can be enabled by removing line '.__LINE__.' in demos/'.basename(__FILE__));


// sample usage:
// $FilenameOut = 'combined.mp3';
// $FilenamesIn[] = 'first.mp3'; // filename with no start/length parameters
// $FilenamesIn[] = array('second.mp3', 0, 0); // filename with zero for start/length is the same as not specified (start = beginning, length = full duration)
// $FilenamesIn[] = array('third.mp3', 0, 10); // extract first 10 seconds of audio
// $FilenamesIn[] = array('fourth.mp3', -10, 0); // extract last 10 seconds of audio
// $FilenamesIn[] = array('fifth.mp3', 10, 0); // extract everything except first 10 seconds of audio
// $FilenamesIn[] = array('sixth.mp3', 0, -10); // extract everything except last 10 seconds of audio
// if (CombineMultipleMP3sTo($FilenameOut, $FilenamesIn)) {
// echo 'Successfully copied '.implode(' + ', $FilenamesIn).' to '.$FilenameOut;
// } else {
// echo 'Failed to copy '.implode(' + ', $FilenamesIn).' to '.$FilenameOut;
// }
//
// Could also be called like this to extract portion from single file:
// CombineMultipleMP3sTo('sample.mp3', array(array('input.mp3', 0, 30))); // extract first 30 seconds of audio


function CombineMultipleMP3sTo($FilenameOut, $FilenamesIn) {

    foreach (
$FilenamesIn as $nextinputfilename) {
        if (
is_array($nextinputfilename)) {
           
$nextinputfilename = $nextinputfilename[0];
        }
        if (!
is_readable($nextinputfilename)) {
            echo
'Cannot read "'.$nextinputfilename.'"<BR>';
            return
false;
        }
    }
    if ((
file_exists($FilenameOut) && !is_writeable($FilenameOut)) || (!file_exists($FilenameOut) && !is_writeable(dirname($FilenameOut)))) {
        echo
'Cannot write "'.$FilenameOut.'"<BR>';
        return
false;
    }

    require_once(
dirname(__FILE__).'/../getid3/getid3.php');
   
ob_start();
    if (
$fp_output = fopen($FilenameOut, 'wb')) {

       
ob_end_clean();
       
// Initialize getID3 engine
       
$getID3 = new getID3;
        foreach (
$FilenamesIn as $nextinputfilename) {
           
$startoffset = 0;
           
$length_seconds = 0;
            if (
is_array($nextinputfilename)) {
                @list(
$nextinputfilename, $startoffset, $length_seconds) = $nextinputfilename;
            }
           
$CurrentFileInfo = $getID3->analyze($nextinputfilename);
            if (
$CurrentFileInfo['fileformat'] == 'mp3') {

               
ob_start();
                if (
$fp_source = fopen($nextinputfilename, 'rb')) {

                   
ob_end_clean();
                   
$CurrentOutputPosition = ftell($fp_output);

                   
// copy audio data from first file
                   
$start_offset_bytes = $CurrentFileInfo['avdataoffset'];
                    if (
$startoffset > 0) { // start X seconds from start of audio
                       
$start_offset_bytes = $CurrentFileInfo['avdataoffset'] + round(($CurrentFileInfo['bitrate'] / 8) * $startoffset);
                    } elseif (
$startoffset < 0) { // start X seconds from end of audio
                       
$start_offset_bytes = $CurrentFileInfo['avdataend'] + round(($CurrentFileInfo['bitrate'] / 8) * $startoffset);
                    }
                   
$start_offset_bytes = max($CurrentFileInfo['avdataoffset'], min($CurrentFileInfo['avdataend'], $start_offset_bytes));

                   
$end_offset_bytes = $CurrentFileInfo['avdataend'];
                    if (
$length_seconds > 0) { // set end offset to X seconds from start of audio
                       
$end_offset_bytes = $start_offset_bytes + round(($CurrentFileInfo['bitrate'] / 8) * $length_seconds);
                    } elseif (
$length_seconds < 0) { // set end offset to X seconds from end of audio
                       
$end_offset_bytes = $CurrentFileInfo['avdataend'] + round(($CurrentFileInfo['bitrate'] / 8) * $length_seconds);
                    }
                   
$end_offset_bytes = max($CurrentFileInfo['avdataoffset'], min($CurrentFileInfo['avdataend'], $end_offset_bytes));

                    if (
$end_offset_bytes <= $start_offset_bytes) {
                        echo
'failed to copy '.$nextinputfilename.' from '.$startoffset.'-seconds start for '.$length_seconds.'-seconds length (not enough data)';
                       
fclose($fp_source);
                       
fclose($fp_output);
                        return
false;
                    }

                   
fseek($fp_source, $start_offset_bytes, SEEK_SET);
                    while (!
feof($fp_source) && (ftell($fp_source) < $end_offset_bytes)) {
                       
fwrite($fp_output, fread($fp_source, min(32768, $end_offset_bytes - ftell($fp_source))));
                    }
                   
fclose($fp_source);

                } else {

                   
$errormessage = ob_get_contents();
                   
ob_end_clean();
                    echo
'failed to open '.$nextinputfilename.' for reading';
                   
fclose($fp_output);
                    return
false;

                }

            } else {

                echo
$nextinputfilename.' is not MP3 format';
               
fclose($fp_output);
                return
false;

            }

        }

    } else {

       
$errormessage = ob_get_contents();
       
ob_end_clean();
        echo
'failed to open '.$FilenameOut.' for writing';
        return
false;

    }

   
fclose($fp_output);
    return
true;
}

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