ref: fce5bcd7e9057da6457f6b99f77f90095e1f6f30
dir: /python/demos/demo_filter.py/
#! /usr/bin/env python
import sys
import os.path
import aubio
def apply_filter(path, target):
# open input file, get its samplerate
s = aubio.source(path)
samplerate = s.samplerate
# create an A-weighting filter
f = aubio.digital_filter(7)
f.set_a_weighting(samplerate)
# create output file
o = aubio.sink(target, samplerate)
total_frames = 0
while True:
# read from source
samples, read = s()
# filter samples
filtered_samples = f(samples)
# write to sink
o(filtered_samples, read)
# count frames read
total_frames += read
# end of file reached
if read < s.hop_size:
break
# print some info
duration = total_frames / float(samplerate)
input_str = "input: {:s} ({:.2f} s, {:d} Hz)"
output_str = "output: {:s}, A-weighting filtered ({:d} frames total)"
print(input_str.format(s.uri, duration, samplerate))
print(output_str.format(o.uri, total_frames))
if __name__ == '__main__':
usage = "{:s} <input_file> [output_file]".format(sys.argv[0])
if not 1 < len(sys.argv) < 4:
print(usage)
sys.exit(1)
if len(sys.argv) < 3:
input_path = sys.argv[1]
basename = os.path.splitext(os.path.basename(input_path))[0] + ".wav"
output_path = "filtered_" + basename
else:
input_path, output_path = sys.argv[1:]
# run function
apply_filter(input_path, output_path)