Drupal Amazon S3 multipart file upload

amazons3_mpfu.php

<?php
function amazons3_upload($file, bucket)
  if(!libraries_load('awssdk')) {
    print t('Unable to load the AWS SDK. Please check you have installed the library correctly and configured your S3 credentials.</br>');
    return;
  }
  else if(!class_exists('AmazonS3')) {
    print t('Cannot load AmazonS3 class. Please check the awssdk is installed correctly.</br>');
    return;
  }

    $s3 = new AmazonS3();
    $filename = basename($file);
    $opt =  array(
      'fileUpload'  => $file,
      'acl'         => AmazonS3::ACL_PRIVATE,
      'storage'     => AmazonS3::STORAGE_STANDARD,
    );
    $response = $s3->create_mpu_object($bucket, $filename, $opt);
    return $response
?>

call:
amazons3_upload('uploadpath/testfile.mp4', 'mytest.bucket')

requires the awssdk module http://drupal.org/project/awssdk

requires the Amazons3 module http://drupal.org/project/amazons3