python - 如何在输入流上播放声音

Question

我想知道是否可以将声音直接播放到 python 的输入中。我正在使用 linux，因此我正在使用 OSS、ALSA 和 Pulseaudio

Answer 1

你绝对可以用 python 播放（和生成）声音

这是一个生成正弦波的示例代码，打开默认的 Alsa 播放设备并通过该设备播放正弦波

#!/usr/bin/env python3
import math
import struct
import alsaaudio
from itertools import *

def sine_wave(frequency=440.0, framerate=44100, amplitude=0.5):
    """Stolen from here: http://zacharydenton.com/generate-audio-with-python/"""
    period = int(framerate / frequency)
    if amplitude > 1.0: amplitude = 1.0
    if amplitude < 0.0: amplitude = 0.0
    lookup_table = [float(amplitude) * math.sin(2.0*math.pi*float(frequency)*(float(i%period)/float(framerate))) for i in range(period)]
    return (lookup_table[i%period] for i in count(0))

sound_out = alsaaudio.PCM()  # open default sound output
sound_out.setchannels(1)  # use only one channel of audio (aka mono)
sound_out.setrate(44100)  # how many samples per second
sound_out.setformat(alsaaudio.PCM_FORMAT_FLOAT_LE)  # sample format

for sample in sine_wave():
    # alsa only eats binnary data
    b = struct.pack("<f", sample)  # convert python float to binary float
    sound_out.write(b)

或者您可以将麦克风环回扬声器

#!/usr/bin/env python3
import struct
import alsaaudio

sound_out = alsaaudio.PCM()  # open default sound output
sound_out.setchannels(1)  # use only one channel of audio (aka mono)
sound_out.setperiodsize(5) # buffer size, default is 32

sound_in = alsaaudio.PCM(type=alsaaudio.PCM_CAPTURE)  # default recording device
sound_in.setchannels(1)  # use only one channel of audio (aka mono)
sound_in.setperiodsize(5) # buffer size, default is 32

while True:
    sample_lenght, sample = sound_in.read()
    sound_out.write(sample)

更多示例可以在 python alsaaudio 库http://pyalsaaudio.sourceforge.net/libalsaaudio.html中找到

Answer 2

我想这取决于你在将它“放入”python 后想用它做什么。我肯定会看看 scikits.audiolab 库。如果您想绘制您正在尝试处理的任何声音的频谱图，这就是您可能使用的（我猜这就是您想要做的？）。