source: python/demos/aubiocut @ a4cc8e5

#! /usr/bin/env python

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

import sys
#from aubio.task import *

usage = "usage: %s [options] -i soundfile" % sys.argv[0]

def parse_args():
    from optparse import OptionParser
    parser = OptionParser(usage=usage)
    parser.add_option("-i", "--input", action = "store", dest = "source_file",
            help="input sound file to analyse", metavar = "<source_file>")
    parser.add_option("-m","--method",
            action="store", dest="onset_method", default='default',
            metavar = "<onset_method>",
            help="onset detection method [default=default] \
                    complexdomain|hfc|phase|specdiff|energy|kl|mkl")
    # cutting methods
    """
    parser.add_option("-b","--beat",
            action="store_true", dest="beat", default=False,
            help="use beat locations")
    parser.add_option("-S","--silencecut",
            action="store_true", dest="silencecut", default=False,
            help="use silence locations")
    parser.add_option("-s","--silence",
            metavar = "<value>",
            action="store", dest="silence", default=-70,
            help="silence threshold [default=-70]")
            """
    # algorithm parameters
    parser.add_option("--samplerate",
            metavar = "<freq>", type='int',
            action="store", dest="samplerate", default=0,
            help="samplerate at which the file should be represented")
    parser.add_option("-B","--bufsize",
            action="store", dest="bufsize", default=512,
            metavar = "<size>",
            help="buffer size [default=512]")
    parser.add_option("-H","--hopsize",
            metavar = "<size>",
            action="store", dest="hopsize", default=256,
            help="overlap size [default=256]")
    parser.add_option("-t","--threshold",
            metavar = "<value>", type="float",
            action="store", dest="threshold", default=0.3,
            help="onset peak picking threshold [default=0.3]")
    """
    parser.add_option("-c","--cut",
            action="store_true", dest="cut", default=False,
            help="cut input sound file at detected labels \
                    best used with option -L")
    parser.add_option("-D","--delay",
            action = "store", dest = "delay", type = "float",
            metavar = "<seconds>", default=0,
            help="number of seconds to take back [default=system]\
                    default system delay is 3*hopsize/samplerate")
    parser.add_option("-C","--dcthreshold",
            metavar = "<value>",
            action="store", dest="dcthreshold", default=1.,
            help="onset peak picking DC component [default=1.]")
    parser.add_option("-M","--mintol",
            metavar = "<value>",
            action="store", dest="mintol", default=0.048,
            help="minimum inter onset interval [default=0.048]")
    parser.add_option("-L","--localmin",
            action="store_true", dest="localmin", default=False,
            help="use local minima after peak detection")
    parser.add_option("-d","--derivate",
            action="store_true", dest="derivate", default=False,
            help="derivate onset detection function")
    parser.add_option("-z","--zerocross",
            metavar = "<value>",
            action="store", dest="zerothres", default=0.008,
            help="zero-crossing threshold for slicing [default=0.00008]")
            """
    # plotting functions
    """
    parser.add_option("-p","--plot",
            action="store_true", dest="plot", default=False,
            help="draw plot")
    parser.add_option("-x","--xsize",
            metavar = "<size>",
            action="store", dest="xsize", default=1.,
            type='float', help="define xsize for plot")
    parser.add_option("-y","--ysize",
            metavar = "<size>",
            action="store", dest="ysize", default=1.,
            type='float', help="define ysize for plot")
    parser.add_option("-f","--function",
            action="store_true", dest="func", default=False,
            help="print detection function")
    parser.add_option("-n","--no-onsets",
            action="store_true", dest="nplot", default=False,
            help="do not plot detected onsets")
    parser.add_option("-O","--outplot",
            metavar = "<output_image>",
            action="store", dest="outplot", default=None,
            help="save plot to output.{ps,png}")
    parser.add_option("-F","--spectrogram",
            action="store_true", dest="spectro", default=False,
            help="add spectrogram to the plot")
    """
    parser.add_option("-v","--verbose",
            action="store_true", dest="verbose", default=True,
            help="make lots of noise [default]")
    parser.add_option("-q","--quiet",
            action="store_false", dest="verbose", default=True,
            help="be quiet")
    (options, args) = parser.parse_args()
    if not options.source_file:
        print "no file name given\n", usage
        sys.exit(1)
    return options, args

if __name__ == '__main__':
    options, args = parse_args()

    hopsize = options.hopsize
    bufsize = options.bufsize
    samplerate = options.samplerate
    source_file = options.source_file

    from aubio import onset, source

    s = source(source_file, samplerate, hopsize)
    if samplerate == 0: samplerate = s.get_samplerate()

    o = onset(options.onset_method, bufsize, hopsize)
    o.set_threshold(options.threshold)


    timestamps = []
    block_read = 0
    while True:
        samples, read = s()
        is_onset = o(samples)
        if is_onset:
            this_onset = (block_read * hopsize - is_onset[0]) 
            if options.verbose:
                print "%.4f" % ( this_onset / samplerate )
            timestamps.append (this_onset)
        block_read += 1
        if read < hopsize: break

    # print some info
    duration = float ( block_read * hopsize + read ) / samplerate
    nstamps = len(timestamps)
    info = 'found %(nstamps)d timestamps in %(source_file)s' % locals()
    info += ' (read %(duration).2fs at %(samplerate)dHz)\n' % locals()
    sys.stderr.write(info)