audioreadのテスト

audioread_test.py

#!/usr/bin/env python
# vim:fileencoding=utf8

import numpy as np
import matplotlib.pyplot as plt
import audioread as ar

def pcm2float(short_ndary):
    float_ndary = np.array(short_ndary, dtype=np.float64)
    return np.where(float_ndary > 0.0, float_ndary / 32767.0, float_ndary / 32768.0)

plt.close("all")
plt.figure(1)

filename = "/path/to/your/wavfile.wav"

wav_bary = bytearray()

with ar.audio_open(filename) as f:
    print("ch: {0}, fs: {1}, duration [s]: {2}".format(f.channels, f.samplerate, f.duration))
    # "block_samples"で指定されたチャンクサイズずつ処理する(デフォルト1024)
    for buf in f:
        wav_bary.extend(buf)

wav_ary = np.frombuffer(wav_bary, dtype=np.int16)  # 常時16bitで読み込まれる
wav_l = wav_ary[0::2]
wav_r = wav_ary[1::2]
print(wav_l.shape)
print(wav_r.shape)

# shortをfloat64に変換
wav_float_l = pcm2float(wav_l)
wav_float_r = pcm2float(wav_r)

plt.plot(wav_float_l)
plt.show()