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<?php
include_once 'Downloader.php';
class YouTubeDownloader extends Downloader {
public function __construc(){
parent::__construct();
}
/*
* Get the video information
* return string
*/
private function getVideoInfo() {
return file_get_contents("https://www.youtube.com/get_video_info?video_id=".$this->extractVideoId($this->video_url)."&cpn=CouQulsSRICzWn5E&eurl&el=adunit");
}
/*
* Get video Id
* @param string
* return string
*/
private function extractVideoId($video_url)
{
//parse the url
$parsed_url = parse_url($video_url);
if($parsed_url["path"] == "youtube.com/watch")
{
$this->video_url = "https://www.".$video_url;
}
else if($parsed_url["path"] == "www.youtube.com/watch")
{
$this->video_url = "https://".$video_url;
}
if(isset($parsed_url["query"]))
{
$query_string = $parsed_url["query"];
//parse the string separated by '&' to array
parse_str($query_string, $query_arr);
if(isset($query_arr["v"]))
{
return $query_arr["v"];
}
}
}
/*
* Get the video download link
* return array
*/
public function getVideoDownloadLink() {
//parse the string separated by '&' to array
parse_str($this->getVideoInfo(), $data);
//set video title
$this->video_title = $data["title"];
//Get the youtube root link that contains video information
$stream_map_arr = $this->getStreamArray();
$final_stream_map_arr = array();
//Create array containing the detail of video
foreach($stream_map_arr as $stream)
{
parse_str($stream, $stream_data);
$stream_data["title"] = $this->video_title;
$stream_data["mime"] = $stream_data["type"];
$mime_type = explode(";", $stream_data["mime"]);
$stream_data["mime"] = $mime_type[0];
$start = stripos($mime_type[0], "/");
$format = ltrim(substr($mime_type[0], $start), "/");
$stream_data["format"] = $format;
unset($stream_data["type"]);
$final_stream_map_arr [] = $stream_data;
}
return $final_stream_map_arr;
}
/*
* Get the youtube root data that contains the video information
* return array
*/
private function getStreamArray()
{
parse_str($this->getVideoInfo(), $data);
$stream_link = $data["url_encoded_fmt_stream_map"];
return explode(",", $stream_link);
}
/*
* Validate the given video url
* return bool
*/
public function hasVideo()
{
$valid = true;
parse_str($this->getVideoInfo(), $data);
if($data["status"] == "fail")
{
$valid = false;
}
return $valid;
}
}