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''''' 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() |
以上这篇python pcm音频添加头转成Wav格式文件的方法就是小编分享给大家的全部内容了,希望能给大家一个参考,也希望大家多多支持服务器之家。
原文链接:https://blog.csdn.net/benhuo931115/article/details/53762556