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<?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. //
// see readme.txt for more details //
// ///
/////////////////////////////////////////////////////////////////
// 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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