getID3::CalculateCompressionRatioVideo(): bool

1965	public function CalculateCompressionRatioVideo() {1966		if (empty($this->info['video'])) {1967			return false;1968		}1969		if (empty($this->info['video']['resolution_x']) || empty($this->info['video']['resolution_y'])) {1970			return false;1971		}1972		if (empty($this->info['video']['bits_per_sample'])) {1973			return false;1974		}1975 1976		switch ($this->info['video']['dataformat']) {1977			case 'bmp':1978			case 'gif':1979			case 'jpeg':1980			case 'jpg':1981			case 'png':1982			case 'tiff':1983				$FrameRate = 1;1984				$PlaytimeSeconds = 1;1985				$BitrateCompressed = $this->info['filesize'] * 8;1986				break;1987 1988			default:1989				if (!empty($this->info['video']['frame_rate'])) {1990					$FrameRate = $this->info['video']['frame_rate'];1991				} else {1992					return false;1993				}1994				if (!empty($this->info['playtime_seconds'])) {1995					$PlaytimeSeconds = $this->info['playtime_seconds'];1996				} else {1997					return false;1998				}1999				if (!empty($this->info['video']['bitrate'])) {2000					$BitrateCompressed = $this->info['video']['bitrate'];2001				} else {2002					return false;2003				}2004				break;2005		}2006		$BitrateUncompressed = $this->info['video']['resolution_x'] * $this->info['video']['resolution_y'] * $this->info['video']['bits_per_sample'] * $FrameRate;2007 2008		$this->info['video']['compression_ratio'] = getid3_lib::SafeDiv($BitrateCompressed, $BitrateUncompressed, 1);2009		return true;2010	}