source: python/aubiocut @ 296c33a

#!/usr/bin/python

""" this file was written by Paul Brossier 
  it is released under the GNU/GPL license.
"""

from aubio.aubioclass import *

bufsize   = 1024
hopsize   = bufsize/2

def cutfile(filein,slicetimes,zerothres=0.002):
    frameread = 0
    readsize  = hopsize 
    filei     = sndfile(filein)
    framestep = hopsize/(filei.samplerate()+0.)
    channels  = filei.channels()
    newname   = "%s%f%s" % ("/tmp/",0.0000000,filein[-4:])
    fileo     = sndfile(newname,model=filei)
    myvec     = fvec(hopsize,channels)
    mycopy    = fvec(hopsize,channels)
    while(readsize==hopsize):
        readsize = filei.read(hopsize,myvec)
        # write to current file
        if len(slicetimes) and frameread >= slicetimes[0]:
            slicetimes.pop(0)
            # write up to 1st zero crossing
            zerocross = 0
            while ( abs( myvec.get(zerocross,0) ) > zerothres ):
                zerocross += 1
            writesize = fileo.write(zerocross,myvec)
            fromcross = 0
            while (zerocross < readsize):
                for i in range(channels):
                        mycopy.set(myvec.get(zerocross,i),fromcross,i)
                fromcross += 1
                zerocross += 1
            del fileo
            fileo = sndfile("%s%s%f%s%s" % 
                (filein.split(".")[0].split("/")[-1],".",
                frameread*framestep,".",filein.split(".")[-1]),model=filei)
            writesize = fileo.write(fromcross,mycopy)
        else:
            writesize = fileo.write(readsize,myvec)
        frameread += 1
    del fileo

import sys
filename  = sys.argv[1]
threshold = 0.2
if (len(sys.argv) > 2): threshold = sys.argv[2]
onsets    = getonsets(filename,threshold)
cutfile(filename,onsets)