普通浮点数转半精度工具实现

来源：互联网发布：rewear it aac 编辑：程序博客网时间：2024/06/10 22:23

工作中遇到的小工具制作，直接压成exe就可以用了

功能：输入文件，将文件中的一列浮点转为一列半精度浮点(半精度浮点)或者两列浮点转为一列复数型半精度浮点，输出为同级目录源文件名+Out.dat，输入0退出

case1:文件中是一行数据0.5，那么输出就是0x3c00

case2:文件中一行数据是 0.5 0或者0 0.5；输出就是0x3C000000和0x00003C00

#! /usr/bin/env python# encoding:utf-8# ! /usr/bin/env python# encoding:utf-8import mathimport redef Real2HalfFloat(data):MINNUM = -65536MAXNUM = 65535FloatVal = 0if data:if data < MINNUM:data = MINNUMif data > MAXNUM:data = MAXNUMsign = 0if data < 0:sign = 1data = -dataexp = math.floor((math.log2(data)))expout = exp + 16Mantial = round(data / pow(2, exp - 10)) - 1024if expout <= 0:FloatVal = 0else:FloatVal = sign * 32768 + expout * 1024 + Mantialreturn FloatValdef ReadCfloatData(sourcefile):input = []with open(sourcfile, 'r') as f:for line in f.readlines():line = line.strip()line = re.sub('\s+',' ',line) #两个数字间多个空格input.append(line.split(' '))destfile = sourcefile.replace('.dat', '')destfile = destfile.replace('.txt', '')destfile += 'Out.dat'with open(destfile, 'w') as fw:for i in range(len(input)):if len(input[i]) == 2:real = Real2HalfFloat(float(input[i][0]))imag = Real2HalfFloat(float(input[i][1]))result = real * 65536 + imagif imag and not real:fw.write('0x0000' + "%X" % result + '\n')elif not imag and not real:fw.write('0x00000000' + '\n')else:fw.write('0x' + "%X" % result + '\n')elif len(input[i]) == 1:result = Real2HalfFloat(float(input[i][0]))if result:fw.write('0x' + "%X" % result + '\n')else:fw.write('0x0000' + '\n')if __name__ == '__main__':print('Tips: Input number 0 if you want to exit!\n')while True:sourcfile = input("input source file:\n")if sourcfile is '0':breakReadCfloatData(sourcfile)print('Transfer Success!')

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