用python处理声音

2018-04-28

最近在用python处理一些音频数据，特此小记。

主要用到了两个库：pydub和librosa：

Pydub

原repo中提及的基本使用：

from pydub import AudioSegment

# 读取音频文件
song = AudioSegment.from_wav("xxx.wav")
song = AudioSegment.from_mp3("xxx.mp3")
song = AudioSegment.from_file("xxx.wav")

# 切分音频
song[:10*1000]  #last ten seconds

# 设置采样率
song.set_frame_rate(16000) # set sample rate as 16000

# 调整音量
song = song + 6 # boost volume by 6dB

# 拼接音频
song = song1 + song2

# 导出音频
song.export('test2.wav', format='wav')

以及在使用过程中和其他处发现的用法：

# 生成

# 会有损失的一种变速方法 
# https://stackoverflow.com/questions/51434897/how-to-change-audio-playback-speed-using-pydub
from pydub import AudioSegment

def speed_change(sound, speed=1.0):
    # Manually override the frame_rate. This tells the computer how many
    # samples to play per second
    sound_with_altered_frame_rate = sound._spawn(sound.raw_data, overrides={
        "frame_rate": int(sound.frame_rate * speed)
    })

    # convert the sound with altered frame rate to a standard frame rate
    # so that regular playback programs will work right. They often only
    # know how to play audio at standard frame rate (like 44.1k)
    return sound_with_altered_frame_rate.set_frame_rate(sound.frame_rate)

sound = AudioSegment.from_file('...')

speed_change(sound, 0.9)

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Pydub

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