Uint16で扱ってるサウンドデータをFloat32に変換

convert_uint16_to_float32.js

var convert_uint16_to_float32 = function(data_view, little_endian) {
	var   byte_length = data_view.byteLength
		, result = new DataView(new ArrayBuffer(byte_length * 2))
		, converter = new  DataView(new ArrayBuffer(2));

	little_endian = !! little_endian;

	for (var i = 0, uint16, int16; i < byte_length; i += 2) {
		uint16 = data_view.getUint16(i, little_endian);
		converter.setInt16(0, (uint16 + 0x8000) * 0xFFFF);
		int16 = converter.getInt16(0);
		result.setFloat32(i * 2, (int16 + 0.5) / (0x7FFF + 0.5));
	}

	return result;
};