ref: 016813e9c9025d8fc805a36d24771e3bc586fa05
dir: /python/demos/demo_reading_speed.py/
#! /usr/bin/env python
# -*- coding: utf-8 -*-
"""
Compare the speed of several methods for reading and loading a sound file.
This file depends on audioread and librosa:
https://github.com/beetbox/audioread
https://github.com/bmcfee/librosa
"""
import numpy as np
import aubio
import audioread
import librosa
def read_file_audioread(filename):
# taken from librosa.util.utils
def convert_buffer_to_float(buf, n_bytes = 2, dtype = np.float32):
# Invert the scale of the data
scale = 1./float(1 << ((8 * n_bytes) - 1))
# Construct the format string
fmt = '<i{:d}'.format(n_bytes)
# Rescale and format the data buffer
out = scale * np.frombuffer(buf, fmt).astype(dtype)
out = out.reshape(2, -1)
return out
with audioread.audio_open(filename) as f:
total_frames = 0
for buf in f:
samples = convert_buffer_to_float(buf)
total_frames += samples.shape[1]
return total_frames, f.samplerate
def load_file_librosa(filename):
y, sr = librosa.load(filename, sr = None)
return len(y), sr
def read_file_aubio(filename):
f = aubio.source(filename, hop_size = 1024)
total_frames = 0
while True:
samples, read = f()
total_frames += read
if read < f.hop_size: break
return total_frames, f.samplerate
def load_file_aubio(filename):
f = aubio.source(filename, hop_size = 1024)
y = np.zeros(f.duration, dtype = aubio.float_type)
total_frames = 0
while True:
samples, read = f()
y[total_frames:total_frames + read] = samples[:read]
total_frames += read
if read < f.hop_size: break
assert len(y) == total_frames
return total_frames, f.samplerate
def test_speed(function, filename):
times = []
for i in range(10):
start = time.time()
total_frames, samplerate = function(filename)
elapsed = time.time() - start
#print ("{:5f} ".format(elapsed)),
times.append(elapsed)
#print
times = np.array(times)
duration_min = int(total_frames/float(samplerate) // 60)
str_format = '{:25s} took {:5f} seconds avg (±{:5f}) to run on a ~ {:d} minutes long file'
print (str_format.format(function.__name__, times.mean(), times.std(), duration_min ))
if __name__ == '__main__':
import sys, time
if len(sys.argv) < 2:
print ("not enough arguments")
sys.exit(1)
filename = sys.argv[1]
functions = [read_file_aubio, load_file_aubio, read_file_audioread, load_file_librosa]
for f in functions:
test_speed(f, filename)