Python中修改MP3格式文件的方法

Python中修改MP3格式文件是如何来实现的呢?下面的内容将会通过具体的实例来演示Python中修改MP3格式文件的实现方法及相关技巧:

本文实例讲述了Python修改MP3文件的方法。分享给大家供大家参考。具体如下:

用这个程序修改后的MP3比原来要小一些了,因为一张图片被删除了,起到了给MP3″瘦身”的作用。在一些mp3中,每个都有一张400多K的图片,10几个MP3,就相当一个普通MP3文件的大小了。

# -*- coding: cp936 -*-
“””
将MP3文件中的ID3V2.3部分去掉,以便在MP3机上播放
用法:mp3lcear [源mp3目录] [生成的mp3目录]
“””
import sys
import os
import string
import shutil
import struct
import thread
import threading
import time
mp3suffix = ‘mp3′
class Process(threading.Thread):
“””
简单地在运行的过程中显示进度
“””
def __init__(self,msg,sleepTime):
threading.Thread.__init__(self)
self.msg = msg
self.running = True
self.sleepTime = sleepTime
def setPause(self,pause):
self.pause = pause
def setRunning(self,running):
self.running = running
def run (self):
while(self.running):
self.pause.wait()
print self.msg,
time.sleep(self.sleepTime)
def usage(code, msg=”):
“””
程序的使用方法
“””
print >> sys.stderr, __doc__
if msg:
print >> sys.stderr, msg
sys.exit(code)
def checkDir(argDir,create=False):
“””
检查目录是否存在,如果create为Ture,则新建一个目录
“””
tempDir = None
if(not os.path.isdir(argDir)):
currentDir = os.path.abspath(os.curdir)
tempDir = os.path.join(currentDir,argDir)
if(not os.path.isdir(tempDir) and create):
os.mkdir(tempDir)
else:
usage(1,”目录”+argDir+”不存在”)
else:
tempDir = os.path.abspath(argDir)
return tempDir
def clearMp3(srcFile,destFile):
“””
修改mp3文件,并将其创建到destFile所指定的地址
“””
global process
srcfp = None
filesize = os.path.getsize(srcFile)
try:
srcfp = open(srcFile,’rb’)
head = srcfp.read(3)
if(head==’ID3′):
srcfp.seek(3,1)
size = srcfp.read(4)
if(not len(size)==4):
print srcFile+’文件格式错误’
else:
size0 = struct.unpack(‘b’,size[0])[0]
size1 = struct.unpack(‘b’,size[1])[0]
size2 = struct.unpack(‘b’,size[2])[0]
size3 = struct.unpack(‘b’,size[3])[0]
headSize =(((size0&0x7f)<<21) | ((size1&0x7f)<<14) | ((size2&0x7f)<<7) | (size3&0x7f)) filesize = filesize - headSize destfp = None try: dataLen = 0 destfp = open(destFile,'wb') srcfp.seek(headSize,1) data=srcfp.read(1024) while (data!= ''): destfp.write(data) data=srcfp.read(1024) except Exception,e: print '创建文件'+destFile+'错误',e try: if (destfp != None): destfp.close except Exception,de: print de else: print srcFile+'不需要修改 拷贝', try: shutil.copyfile(srcFile,destFile) except Exception, ce: print ce except Exception,oe: print '修改中出错',oe try: if (srcfp != None): srcfp.close() except Exception,se: print de if __name__ == "__main__": if(len(sys.argv)<3): usage(1) global process sourceDir = checkDir(sys.argv[1]) destDir = checkDir(sys.argv[2],True) print 'Mp3源目录',sourceDir print 'Mp3目的目录',destDir process = Process('...',1) pause = threading.Event() process.setPause(pause) process.start() for filename in os.listdir(sourceDir): srcPath = os.path.join(sourceDir, filename) destPath = os.path.join(destDir, filename) if os.path.isfile(srcPath): print '开始处理 '+filename, tempfilename = filename.lower() if(not tempfilename.endswith(mp3suffix)): print filename+'不是一个mp3文件n' else: pause.set() clearMp3(srcPath,destPath) pause.clear() print '结束 n' pause.set() process.running = False sys.exit(0) [/code]
Python中修改MP3格式文件就是这样,欢迎大家参考。。。。

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