如何使用wavio将双通道wav文件的每个通道分成两个不同的文件？或另一个图书馆？

Question

以下脚本可以播放原始文件.我尝试以明显的方式分离每个频道,但它不起作用.

import os
import wavio
import numpy
import pyglet

file_name = "guitarup_full.wav"

# I get the file !
File = wavio.read(file_name)
rate = File.rate
# it looks good
print File.data.shape
print rate
# and then the channels:
channel_1 = File.data[:,0]
channel_2 = File.data[:,1]
wavio.write("guitar_channel_1.wav", channel_1, rate )
wavio.write("guitar_channel_2.wav", channel_2, rate )

# now we try to play:
source =  pyglet.resource.media(file_name, streaming=False)
source_ch1 =  pyglet.resource.media("guitar_channel_1.wav", streaming=False)
source_ch2 =  pyglet.resource.media("guitar_channel_2.wav", streaming=False)

#uncomment the one you want to listen.
source.play()
#source_ch1.play()
#source_ch2.play()

pyglet.app.run()

第一个听起来像吉他,第二个和第三个听起来像高斯噪音.有人能告诉我它有什么问题吗？

我使用的音频文件是:https: //www.freesounds.info/global/wav.php？fileid = 11

数据的形状为:(88471,2),速率为:44100

另外,如果我在另一个播放器中播放该文件,我会得到相同的结果:高斯噪声.

注意: pyglet的使用对于这个问题来说是多余的.如果您使用它来调查此问题,请确保文件位于资源文件夹中注册的文件夹中.要做到这一点:

pyglet.resource.path.append("your_sounds_location")
pyglet.resource.reindex()

Answer 1

我认为您正试图让它变得比需要的复杂得多。如果你不介意使用而scipy不是分离通道归结为：

from scipy.io import wavfile

fs, data = wavfile.read('guitarup_full.wav')            # reading the file

wavfile.write('guitar_channel_1.wav', fs, data[:, 0])   # saving first column which corresponds to channel 1
wavfile.write('guitar_channel_2.wav', fs, data[:, 1])   # saving second column which corresponds to channel 2

Answer 2

我不知道wavio代码有什么问题,但是这里是你如何使用标准Python模块wave(也被wavio使用)和numpy 分离WAV通道:

import wave
import numpy as np

def save_wav_channel(fn, wav, channel):
    '''
    Take Wave_read object as an input and save one of its
    channels into a separate .wav file.
    '''
    # Read data
    nch   = wav.getnchannels()
    depth = wav.getsampwidth()
    wav.setpos(0)
    sdata = wav.readframes(wav.getnframes())

    # Extract channel data (24-bit data not supported)
    typ = { 1: np.uint8, 2: np.uint16, 4: np.uint32 }.get(depth)
    if not typ:
        raise ValueError("sample width {} not supported".format(depth))
    if channel >= nch:
        raise ValueError("cannot extract channel {} out of {}".format(channel+1, nch))
    print ("Extracting channel {} out of {} channels, {}-bit depth".format(channel+1, nch, depth*8))
    data = np.fromstring(sdata, dtype=typ)
    ch_data = data[channel::nch]

    # Save channel to a separate file
    outwav = wave.open(fn, 'w')
    outwav.setparams(wav.getparams())
    outwav.setnchannels(1)
    outwav.writeframes(ch_data.tostring())
    outwav.close()

wav = wave.open(WAV_FILENAME)
save_wav_channel('ch1.wav', wav, 0)
save_wav_channel('ch2.wav', wav, 1)

Answer 3

在命令行上尝试ffmpeg：

将立体声输入中的每个声道输出到单独的单声道文件：

ffmpeg -i stereo.wav -map_channel 0.0.0 left.wav -map_channel 0.0.1 right.wav

我在您的文件上尝试了它，它似乎起作用了。

如果您需要将其放入python程序中，请使用os.system（cmd）