Python修改MP3文件的方法
(编辑:jimmy 日期: 2024/11/29 浏览:3 次 )
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)
希望本文所述对大家的Python程序设计有所帮助。
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