AudioConvert(2f)Code

#!python

#!/usr/bin/python
# I convert to and from various audio file formats depending on extension of
# file names specified on command line
# TODO: support giving just ext as second arg, without file name. In that
# case, convert to file of same name.


import sys, os

usage = "%s [src.ext1] [dst.ext2]" %sys.argv[0] 

############
# DECODERS ###################################
# convert format specified in key to raw wav #
##############################################
decoders = {}
decoders['wav'] = "cp %s %s"
decoders['ogg'] = "oggdec %s -o %s"
decoders['mpc'] = "mppdec %s %s"
decoders['wma'] = "mplayer %s -ao pcm:file=%s"
decoders['mp3'] = "mplayer %s -ao pcm:file=%s"

############
# ENCODERS ###################################
# convert raw wav to format specified in key #
##############################################
encoders = {}
encoders['wav'] = "cp %s %s"
encoders['mp3'] = "lame %s %s"
encoders['ogg'] = "oggenc %s -o %s"
encoders['mpc'] = "mppenc %s %s"

tmp = "temp.wav"

def parse_args():
    if len(sys.argv) != 3:
    print usage
    sys.exit(1)

    src = sys.argv[1]
    dst = sys.argv[2]

    if not get_ext(src) in decoders:
    error("I don't know how to convert from %s extensions" %src)
    sys.exit(1)

    if not get_ext(dst) in encoders:
    error("I don't know how to convert to %s extensions" %dst_ext)
    sys.exit(1)

    if only_ext_specified(dst):
    info("You didn't specify a name for extension %s" %
        get_ext(dst))
    dst = "%s.%s" %(get_name(src), get_ext(dst))
    info("Using name %s" %dst)

    return src, dst

def get_ext(filename):
    return filename.split('.')[-1]

def get_name(filename):
    s = filename.split('.')
    s.pop()
    return ".".join(s)

def only_ext_specified(filename):
    return len(filename.split(".")) <= 1

def error(string):
    print "[E] %s." %(string)

def info(string):
    print "[I] %s." %(string)

def decode(src):
    "decodes src to dst"
    info("Decoding %s to %s" %(src, tmp))
    call = decoders[get_ext(src)] % (`src`, tmp)
    os.system(call)

def encode(dst):
    "encodes tmp to dst"
    info("Encoding %s to %s" %(tmp, dst))
    call = encoders[get_ext(dst)] % (tmp, '"`basename %s`"' % `dst`)
    os.system(call)

def delete_tmp():
    "deletes temp wav file"
    info ("Deleting temporary %s file" % tmp)
    os.system("rm %s" % tmp)

if __name__ == '__main__': 
    (src, dst) = parse_args()
    decode(src)
    encode(dst)
    delete_tmp()