source: python/aubiocut @ a4b089c

#!/usr/bin/python

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

from aubio.aubioclass import *
import sys

bufsize   = 1024
hopsize   = bufsize/2


def cutfile(filein,onsets):
        frameread = 0
        zerothres = 0.002
        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(onsets) and frameread >= onsets[0]:
                    onsets.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

filename  = sys.argv[1]
threshold = sys.argv[2]
onsets    = getonsets(filename,threshold)
cutfile(filename,onsets)