我需要任何python库来改变我的wav文件的音高,而不需要任何原始的音频数据处理。我花了几个小时才找到它,但只发现了一些奇怪的原始数据处理代码片段和视频,它显示了实时音高变化,但没有源代码。
由于wav
文件基本上是原始音频数据,因此如果没有“原始音频处理”,您将无法更改音高。
这是你能做的。您将需要wave
(标准库)和numpy
模块。
import wave
import numpy as np
打开文件。
wr = wave.open('input.wav', 'r')
# Set the parameters for the output file.
par = list(wr.getparams())
par[3] = 0 # The number of samples will be set by writeframes.
par = tuple(par)
ww = wave.open('pitch1.wav', 'w')
ww.setparams(par)
声音应该在很短的时间内处理。这减少了混响。尝试将fr
设置为1;你会听到恼人的回声。
fr = 20
sz = wr.getframerate()//fr # Read and process 1/fr second at a time.
# A larger number for fr means less reverb.
c = int(wr.getnframes()/sz) # count of the whole file
shift = 100//fr # shifting 100 Hz
for num in range(c):
读取数据,将其分为左右声道(假设为立体声WAV文件)。
da = np.fromstring(wr.readframes(sz), dtype=np.int16)
left, right = da[0::2], da[1::2] # left and right channel
使用内置于numpy中的快速傅里叶变换提取频率。
lf, rf = np.fft.rfft(left), np.fft.rfft(right)
滚动阵列以增加音高。
lf, rf = np.roll(lf, shift), np.roll(rf, shift)
最高频率翻到最低频率。那不是我们想要的,所以把它们归零。
lf[0:shift], rf[0:shift] = 0, 0
现在使用逆傅立叶变换将信号转换回幅度。
nl, nr = np.fft.irfft(lf), np.fft.irfft(rf)
结合两个渠道。
ns = np.column_stack((nl, nr)).ravel().astype(np.int16)
写输出数据。
ww.writeframes(ns.tostring())
处理完所有帧后关闭文件。
wr.close()
ww.close()
您可以尝试使用pydub在整个音频文件和不同格式(wav,mp3等)上快速轻松地改变音高。
这是一个有效的代码。来自here的灵感,并参考here更多关于球场变化的细节。
from pydub import AudioSegment
from pydub.playback import play
sound = AudioSegment.from_file('in.wav', format="wav")
# shift the pitch up by half an octave (speed will increase proportionally)
octaves = 0.5
new_sample_rate = int(sound.frame_rate * (2.0 ** octaves))
# keep the same samples but tell the computer they ought to be played at the
# new, higher sample rate. This file sounds like a chipmunk but has a weird sample rate.
hipitch_sound = sound._spawn(sound.raw_data, overrides={'frame_rate': new_sample_rate})
# now we just convert it to a common sample rate (44.1k - standard audio CD) to
# make sure it works in regular audio players. Other than potentially losing audio quality (if
# you set it too low - 44.1k is plenty) this should now noticeable change how the audio sounds.
hipitch_sound = hipitch_sound.set_frame_rate(44100)
#Play pitch changed sound
play(hipitch_sound)
#export / save pitch changed sound
hipitch_sound.export("out.wav", format="wav")
我建议尝试使用Librosa的音高变换功能:https://librosa.github.io/librosa/generated/librosa.effects.pitch_shift.html
import librosa
y, sr = librosa.load('your_file.wav', sr=16000) # y is a numpy array of the wav file, sr = sample rate
y_shifted = librosa.effects.pitch_shift(y, sr, n_steps=4) # shifted by 4 half steps