How to modify MP3 files using Python

How to modify MP3 files using Python

This example describes how to modify an MP3 file in Python. Share it with you for your reference. The details are as follows:

The MP3 File Modified by this program is smaller than the original one. Because an image is deleted, it plays a role of "slimming" the MP3 file. In some mp3 files, each of which has an image of more than 400 K and a dozen MP3 files is equivalent to the size of an ordinary MP3 file.

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#-*-Coding: cp936 -*- """ Remove ID3V2.3 from the MP3 file for playing on the MP3 host. Usage: mp3lcear [Source mp3 Directory] [generated mp3 Directory] """ Import sys Import OS Import string Import shutil Import struct Import thread Import threading Import time Mp3suffix = 'mp3' Class Process (threading. Thread ): """ Simply display the progress during running """ 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 = ''): """ Procedure """ Print> sys. stderr, _ doc __ If msg: Print> sys. stderr, msg Sys. exit (code) Def checkDir (argDir, create = False ): """ Check whether the directory exists. If create is true, a new directory is created. """ 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 + "nonexistent ") 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 format 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 = srcfp. read (1, 1024) While (data! = ''): Destfp. write (data) Data = srcfp. read (1, 1024) Except t Exception, e: Print 'create file' + destFile + 'error', e Try: If (destfp! = None ): Destfp. close Except t Exception, de: Print de Else: Print srcFile + 'do not need to modify copy ', Try: Shutil. copyfile (srcFile, destFile) Except t Exception, ce: Print ce Failed t Exception, oe: Print 'modification error ', oe Try: If (srcfp! = None ): Srcfp. close () Failed t 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 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 'start processing '+ filename, Tempfilename = filename. lower () If (not tempfilename. endswith (mp3suffix )): Print filename + 'not an 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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