Alltube\VideoDownload::getAudioStream PHP 메소드

    public function getAudioStream($url, $format)
    {
        if (!shell_exec('which ' . $this->config->avconv)) {
            throw new \Exception('Can\'t find avconv or ffmpeg');
        }
        $video = $this->getJSON($url, $format);
        //Vimeo needs a correct user-agent
        ini_set('user_agent', $video->http_headers->{'User-Agent'});
        $avconvProc = ProcessBuilder::create([$this->config->avconv, '-v', 'quiet', '-i', '-', '-f', 'mp3', '-vn', 'pipe:1']);
        if (parse_url($video->url, PHP_URL_SCHEME) == 'rtmp') {
            $process = $this->getRtmpProcess($video);
        } else {
            $process = $this->getCurlProcess($video);
        }
        $chain = new Chain($process);
        $chain->add('|', $avconvProc);
        return popen($chain->getProcess()->getCommandLine(), 'r');
    }

 /**
  * Test getAudioStream function without curl or rtmpdump.
  *
  * @param string $url    URL
  * @param string $format Format
  *
  * @return void
  * @expectedException Exception
  * @dataProvider      urlProvider
  */
 public function testGetAudioStreamCurlError($url, $format)
 {
     $config = \Alltube\Config::getInstance();
     $config->curl = 'foobar';
     $config->rtmpdump = 'foobar';
     $this->download->getAudioStream($url, $format);
 }