Skip to content Skip to main navigation Skip to footer

python处理二进制数据的方法介绍

python处理二进制数据的方法是如何来实现的呢?下面的内容将会通过具体的实例来演示python处理二进制数据的方法的实现方法及相关技巧:

本文实例讲述了python处理二进制数据的方法。分享给大家供大家参考。具体如下:

#!/usr/env/env python
#-*- coding: cp936 -*-
'''''
add Head Infomation for pcm file
'''
import sys
import struct
import os
__author__ = 'bob_hu, hewitt924@gmail.com'
__date__ = 'Dec 19,2011'
__update__ = 'Dec 19,2011'
def geneHeadInfo(sampleRate,bits,sampleNum):
  '''''
  生成头信息,需要采样率,每个采样的位数,和整个wav的采样的字节数
  '''
  rHeadInfo = 'x52x49x46x46'
  fileLength = struct.pack('i',sampleNum + 36)
  rHeadInfo += fileLength
  rHeadInfo += 'x57x41x56x45x66x6Dx74x20x10x00x00x00x01x00x01x00'
  rHeadInfo += struct.pack('i',sampleRate)
  rHeadInfo += struct.pack('i',sampleRate * bits / 8)
  rHeadInfo += 'x02x00'
  rHeadInfo += struct.pack('H',bits)
  rHeadInfo += 'x64x61x74x61'
  rHeadInfo += struct.pack('i',sampleNum)
  return rHeadInfo
if __name__ == '__main__':
  if len(sys.argv) != 5:
    print "usage: python %s inFile sampleRate bits outFile" % sys.argv[0]
    sys.exit(1)
  fout = open(sys.argv[4],'wb') #用二进制的写入模式
  #fout.write(struct.pack('4s','x66x6Dx74x20'))
  #写入一个长度为4的串,这个串的二进制内容为 66 6D 74 20
  #Riff_flag,afd,fad,afdd, = struct.unpack('4c',fin.read(4))
  #读入四个字节,每一个都解析成一个字母
  #open(sys.argv[4],'wb').write(struct.pack('4s','fmt '))
  #将字符串解析成二进制后再写入
  #open(sys.argv[4],'wb').write('x3Cx9Cx00x00x57')
  #直接写入二进制内容:3C 9C 00 00 57
  #fout.write(struct.pack('i',6000)) #写入6000的二进制形式
  #check whether inFile has head-Info
  fin = open(sys.argv[1],'rb')
  Riff_flag, = struct.unpack('4s',fin.read(4))
  if Riff_flag == 'RIFF':
    print "%s 有头信息" % sys.argv[1]
    fin.close()
    sys.exit(0)
  else:
    print "%s 没有头信息" % sys.argv[1]
    fin.close()
    #采样率
    sampleRate = int(sys.argv[2])
    #bit位
    bits = int(sys.argv[3])
    fin = open(sys.argv[1],'rb')
    startPos = fin.tell()
    fin.seek(0,os.SEEK_END)
    endPos = fin.tell()
    sampleNum = (endPos - startPos)
    print sampleNum
    headInfo = geneHeadInfo(sampleRate,bits,sampleNum)
    fout.write(headInfo)
    fin.seek(os.SEEK_SET)
    fout.write(fin.read())
    fin.close()
    fout.close()
 


python处理二进制数据的方法就是这样,欢迎大家参考。。。。

0 Comments

There are no comments yet

Leave a comment

Your email address will not be published.