138 lines
5.5 KiB
PHP
138 lines
5.5 KiB
PHP
<?php
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/////////////////////////////////////////////////////////////////
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/// getID3() by James Heinrich <info@getid3.org> //
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// available at https://github.com/JamesHeinrich/getID3 //
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// or https://www.getid3.org //
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// or http://getid3.sourceforge.net //
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// //
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// /demo/demo.joinmp3.php - part of getID3() //
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// Sample script for splicing two or more MP3s together into //
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// one file. Does not attempt to fix VBR header frames. //
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// Can also be used to extract portion from single file. //
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// Note: all joined MP3s need to be the same sample rate. //
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// see readme.txt for more details //
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// ///
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/////////////////////////////////////////////////////////////////
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die('For security reasons, this demo has been disabled. It can be enabled by removing line '.__LINE__.' in demos/'.basename(__FILE__));
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// sample usage:
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// $FilenameOut = 'combined.mp3';
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// $FilenamesIn[] = 'first.mp3'; // filename with no start/length parameters
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// $FilenamesIn[] = array('second.mp3', 0, 0); // filename with zero for start/length is the same as not specified (start = beginning, length = full duration)
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// $FilenamesIn[] = array('third.mp3', 0, 10); // extract first 10 seconds of audio
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// $FilenamesIn[] = array('fourth.mp3', -10, 0); // extract last 10 seconds of audio
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// $FilenamesIn[] = array('fifth.mp3', 10, 0); // extract everything except first 10 seconds of audio
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// $FilenamesIn[] = array('sixth.mp3', 0, -10); // extract everything except last 10 seconds of audio
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// if (CombineMultipleMP3sTo($FilenameOut, $FilenamesIn)) {
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// echo 'Successfully copied '.implode(' + ', $FilenamesIn).' to '.$FilenameOut;
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// } else {
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// echo 'Failed to copy '.implode(' + ', $FilenamesIn).' to '.$FilenameOut;
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// }
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//
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// Could also be called like this to extract portion from single file:
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// CombineMultipleMP3sTo('sample.mp3', array(array('input.mp3', 0, 30))); // extract first 30 seconds of audio
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function CombineMultipleMP3sTo($FilenameOut, $FilenamesIn) {
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foreach ($FilenamesIn as $nextinputfilename) {
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if (is_array($nextinputfilename)) {
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$nextinputfilename = $nextinputfilename[0];
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}
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if (!is_readable($nextinputfilename)) {
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echo 'Cannot read "'.$nextinputfilename.'"<BR>';
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return false;
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}
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}
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if ((file_exists($FilenameOut) && !is_writeable($FilenameOut)) || (!file_exists($FilenameOut) && !is_writeable(dirname($FilenameOut)))) {
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echo 'Cannot write "'.$FilenameOut.'"<BR>';
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return false;
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}
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require_once(dirname(__FILE__).'/../getid3/getid3.php');
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ob_start();
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if ($fp_output = fopen($FilenameOut, 'wb')) {
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ob_end_clean();
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// Initialize getID3 engine
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$getID3 = new getID3;
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foreach ($FilenamesIn as $nextinputfilename) {
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$startoffset = 0;
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$length_seconds = 0;
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if (is_array($nextinputfilename)) {
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@list($nextinputfilename, $startoffset, $length_seconds) = $nextinputfilename;
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}
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$CurrentFileInfo = $getID3->analyze($nextinputfilename);
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if ($CurrentFileInfo['fileformat'] == 'mp3') {
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ob_start();
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if ($fp_source = fopen($nextinputfilename, 'rb')) {
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ob_end_clean();
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$CurrentOutputPosition = ftell($fp_output);
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// copy audio data from first file
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$start_offset_bytes = $CurrentFileInfo['avdataoffset'];
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if ($startoffset > 0) { // start X seconds from start of audio
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$start_offset_bytes = $CurrentFileInfo['avdataoffset'] + round(($CurrentFileInfo['bitrate'] / 8) * $startoffset);
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} elseif ($startoffset < 0) { // start X seconds from end of audio
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$start_offset_bytes = $CurrentFileInfo['avdataend'] + round(($CurrentFileInfo['bitrate'] / 8) * $startoffset);
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}
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$start_offset_bytes = max($CurrentFileInfo['avdataoffset'], min($CurrentFileInfo['avdataend'], $start_offset_bytes));
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$end_offset_bytes = $CurrentFileInfo['avdataend'];
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if ($length_seconds > 0) { // set end offset to X seconds from start of audio
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$end_offset_bytes = $start_offset_bytes + round(($CurrentFileInfo['bitrate'] / 8) * $length_seconds);
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} elseif ($length_seconds < 0) { // set end offset to X seconds from end of audio
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$end_offset_bytes = $CurrentFileInfo['avdataend'] + round(($CurrentFileInfo['bitrate'] / 8) * $length_seconds);
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}
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$end_offset_bytes = max($CurrentFileInfo['avdataoffset'], min($CurrentFileInfo['avdataend'], $end_offset_bytes));
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if ($end_offset_bytes <= $start_offset_bytes) {
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echo 'failed to copy '.$nextinputfilename.' from '.$startoffset.'-seconds start for '.$length_seconds.'-seconds length (not enough data)';
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fclose($fp_source);
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fclose($fp_output);
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return false;
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}
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fseek($fp_source, $start_offset_bytes, SEEK_SET);
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while (!feof($fp_source) && (ftell($fp_source) < $end_offset_bytes)) {
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fwrite($fp_output, fread($fp_source, min(32768, $end_offset_bytes - ftell($fp_source))));
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}
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fclose($fp_source);
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} else {
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$errormessage = ob_get_contents();
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ob_end_clean();
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echo 'failed to open '.$nextinputfilename.' for reading';
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fclose($fp_output);
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return false;
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}
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} else {
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echo $nextinputfilename.' is not MP3 format';
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fclose($fp_output);
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return false;
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}
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}
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} else {
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$errormessage = ob_get_contents();
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ob_end_clean();
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echo 'failed to open '.$FilenameOut.' for writing';
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return false;
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}
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fclose($fp_output);
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return true;
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}
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