Method formatIsValid

wav.h:93–100

		PCM=1
	};
	bool formatIsValid(uint16_t format, uint16_t bits) {
		if (format == (uint16_t)Format::PCM) {
			if (bits == 16) {
				return true;
			}
		}
		return false;
	}
	
	Result read(std::string filename) {
		std::ifstream file;