alltube/classes/streams/YoutubeChunkStream.php

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<?php
/**
* YoutubeChunkStream class.
*/
namespace Alltube\Stream;
use GuzzleHttp\Psr7\Response;
use Psr\Http\Message\StreamInterface;
/**
* This is a wrapper around GuzzleHttp\Psr7\Stream.
* It is required because Youtube HTTP responses are buggy if we try to read further than the end of the response.
*/
class YoutubeChunkStream implements StreamInterface
{
/**
* HTTP response containing the video chunk.
*
* @var Response
*/
private $response;
/**
* YoutubeChunkStream constructor.
*
* @param Response $response HTTP response containing the video chunk
*/
public function __construct(Response $response)
{
$this->response = $response;
}
/**
* Read data from the stream.
*
* @param int $length Read up to $length bytes from the object and return
*
* @return string
*/
public function read($length)
{
$size = $this->response->getHeader('Content-Length')[0];
if ($size - $this->tell() < $length) {
// Don't try to read further than the end of the stream.
$length = $size - $this->tell();
}
return $this->response->getBody()->read($length);
}
/**
* Reads all data from the stream into a string, from the beginning to end.
*/
public function __toString()
{
return (string) $this->response->getBody();
}
/**
* Closes the stream and any underlying resources.
*
* @return void
*/
public function close()
{
$this->response->getBody()->close();
}
/**
* Separates any underlying resources from the stream.
*
* @return resource|null
*/
public function detach()
{
return $this->response->getBody()->detach();
}
/**
* Get the size of the stream if known.
*
* @return int|null
*/
public function getSize()
{
return $this->response->getBody()->getSize();
}
/**
* Returns the current position of the file read/write pointer.
*
* @return int
*/
public function tell()
{
return $this->response->getBody()->tell();
}
/**
* Returns true if the stream is at the end of the stream.
*
* @return bool
*/
public function eof()
{
return $this->response->getBody()->eof();
}
/**
* Returns whether or not the stream is seekable.
*
* @return bool
*/
public function isSeekable()
{
return $this->response->getBody()->isSeekable();
}
/**
* Seek to a position in the stream.
*
* @param int $offset Stream offset
* @param int $whence Specifies how the cursor position will be calculated
*
* @return mixed
*/
public function seek($offset, $whence = SEEK_SET)
{
return $this->response->getBody()->seek($offset, $whence);
}
/**
* Seek to the beginning of the stream.
*
* @return mixed
*/
public function rewind()
{
return $this->response->getBody()->rewind();
}
/**
* Returns whether or not the stream is writable.
*
* @return bool
*/
public function isWritable()
{
return $this->response->getBody()->isWritable();
}
/**
* Write data to the stream.
*
* @param string $string The string that is to be written
*
* @return mixed
*/
public function write($string)
{
return $this->response->getBody()->write($string);
}
/**
* Returns whether or not the stream is readable.
*
* @return bool
*/
public function isReadable()
{
return $this->response->getBody()->isReadable();
}
/**
* Returns the remaining contents in a string.
*
* @return string
*/
public function getContents()
{
return $this->response->getBody()->getContents();
}
/**
* Get stream metadata as an associative array or retrieve a specific key.
*
* @param string $key Specific metadata to retrieve.
*
* @return array|mixed|null
*/
public function getMetadata($key = null)
{
return $this->response->getBody()->getMetadata($key);
}
}