#!python
# -*- mode: python; Encoding: utf-8; coding: utf-8 -*-
# Last updated: <2018/12/05 18:18:26 +0900>
"""
use pydub. divide wav file.

【Python/pydub】mp3、wavファイルから部分抽出（切り分け、分割） | アルゴリズム雑記
https://algorithm.joho.info/programming/python/pydub-split/

【Python/pydub】mp3、wavのデータをNumPy配列に変換 | アルゴリズム雑記
https://algorithm.joho.info/programming/python/pydub-numpy/

Windows10 x64 + Python 2.7.15 32bit
"""

from pydub import AudioSegment
from pydub.playback import play
import numpy as np
import matplotlib.pyplot as plt

infile = "hello.wav"

sound = AudioSegment.from_wav(infile)
# play(sound)

data = np.array(sound.get_array_of_samples())
x = data[::sound.channels]

rate = sound.frame_rate
frm = rate / 60
sample_len = len(x)

print("Input file : %s" % infile)
print("Channel : %d" % sound.channels)
print("Sampling rate : %d Hz" % rate)
print("1 Frame length : %f point" % frm)
print("Duration : %f msec" % len(sound))
print("Sample length : %f point" % sample_len)

dt = []
for i in range(0,sample_len,frm):
    dt.append(x[i:i+frm])

if True:
    # plt.plot(x[::1])
    row = 10
    for i in range(row):
        plt.subplot(row, 1, i + 1)
        plt.plot(dt[i])
        plt.grid()
    plt.show()