getid3_mp3::ClosestStandardMP3Bitrate

					$AudioFrameLengthCache[$bitrate][$version][$layer][$padding][$samplerate] = (int) $NewFramelength;
				}
			}
		}
		return $AudioFrameLengthCache[$bitrate][$version][$layer][$padding][$samplerate];
	}

	/**
	 * @param float|int $bit_rate
	 *
	 * @return int|float|string
	 */
	public static function ClosestStandardMP3Bitrate($bit_rate) {
		static $standard_bit_rates = array (320000, 256000, 224000, 192000, 160000, 128000, 112000, 96000, 80000, 64000, 56000, 48000, 40000, 32000, 24000, 16000, 8000);
		static $bit_rate_table = array (0=>'-');
		$round_bit_rate = intval(round($bit_rate, -3));
		if (!isset($bit_rate_table[$round_bit_rate])) {
			if ($round_bit_rate > max($standard_bit_rates)) {
				$bit_rate_table[$round_bit_rate] = round($bit_rate, 2 - strlen($bit_rate));