python pcm音频添加头转成Wav格式文件的方法

''''' 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 = '/x52/x49/x46/x46'  fileLength = struct.pack('i',sampleNum + 36)   rHeadInfo += fileLength   rHeadInfo += '/x57/x41/x56/x45/x66/x6D/x74/x20/x10/x00/x00/x00/x01/x00/x01/x00'  rHeadInfo += struct.pack('i',sampleRate)   rHeadInfo += struct.pack('i',sampleRate * bits / 8)   rHeadInfo += '/x02/x00'  rHeadInfo += struct.pack('H',bits)   rHeadInfo += '/x64/x61/x74/x61'  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','/x66/x6D/x74/x20'))  #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('/x3C/x9C/x00/x00/x57')  #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()