How Python modifies the MP3 file

The example in this article describes how Python modifies MP3 files. Share to everyone for your reference. Specifically as follows:

Use this program to modify the MP3 is smaller than the original, because a picture was deleted, played to MP3 "thin body" role. In some MP3, each has a picture of more than 400 K, 10 a few MP3, is quite a common MP3 file size.

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#-*-coding:cp936-*-"" To remove the id3v2.3 part of the MP3 file for playback on the MP3 machine: mp3lcear [source mp3 directory] [generated MP3 directory] "" Import sys import OS Impor T string import shutil import struct import thread import threading import Time Mp3suffix = ' mp3 ' Class Process (threading. Thread): "" "" "Simply Displays Progress" "" Def __init__ (self,msg,sleeptime): threading in the process of running. 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 S Elf.msg, Time.sleep (self.sleeptime) def usage (code, msg= ' "):" "" "" "" "" "" "" "" Print >> Sys.stderr, __doc__ if MSG:PR int >> Sys.stderr, msg sys.exit (code) def checkdir (argdir,create=false): "" Check if the directory exists, and if Create is ture, create a new directory "" 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, "directory" +argdir+ "does not exist") Else:tempdir = Os.path.abspath (Argdir) return tempdir def clearMp3 (srcfile,destfile): "" Modify the MP3 file and create it to the address specified by DestFile "" "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+ ' file Type error ' 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=src Fp.read (1024) while (data!= '): Destfp.write (data) data=srcfp.read (1024) except ' exception,e:print ' Create file ' +destfile+ ' Error ', e try:if (DESTFP!= None): destfp.close except Exception,de:print de else:print srcfile+ ' do not need to modify copies ', Try:shutIl.copyfile (srcfile,destfile) except Exception, ce:print ce except exception,oe:print ' Error in modification ', OE try:if (SRCFP!= None) : Srcfp.close () except Exception,se:print de if __name__ = = "__main__": if (len (SYS.ARGV) <3): Usage (1) Global process S Ourcedir = Checkdir (sys.argv[1]) Destdir = Checkdir (sys.argv[2],true) print ' Mp3 source directory ', sourcedir print ' Mp3 destination directory ', 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 ' starts processing ' +filename, TempFileName = Filename.lower () if (not Tempfilename.endswith (mp3suffix)): Print filename+ ' is not a MP3 file n ' else:pause.set () clearMp3 ( Srcpath,destpath) pause.clear () print ' End N ' pause.set () process.running = False sys.exit (0)

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