import numpy as np
import librosa.display
import matplotlib.pyplot as plt


times = librosa.get_duration(filename='aa.wav')
y, sr = librosa.load('aa.wav',sr=8000,offset=0.0,duration=None)
x=np.arange(0,times,1/sr)

plt.plot(x,y)
plt.xlabel('times')
plt.ylabel('amplitude')
plt.title("aa.wav",fontsize=12,color='black')
plt.show()

def frame(x,lframe,mframe):
    signal_length =len(x)
    fn = (signal_length-lframe)/mframe
    fn1 = np.ceil(fn)
    fn1 = int(fn1)

    numfillzero = (fn1*mframe+lframe)-signal_length

    fillzeros = np.zeros(numfillzero)

    fillsignal = np.concatenate((x,fillzeros))

    d = np.tile(np.arange(0,lframe),(fn1,1))+np.tile(np.arange(0,fn1*mframe,mframe),(lframe,1)).T

    d = np.array(d,dtype=np.int32)
    signal = fillsignal[d]
    return(signal,fn1,numfillzero)
lframe = int(sr*0.025)
mframe = int(sr*0.001)

endframe,fn1,numfillzero = frame(y,lframe,mframe)

hanwindow = np.hanning(lframe)
signalwindow=endframe[0]*hanwindow

x1 = np.arange(0,lframe,1)
x2 = np.arange(0,lframe/sr,1/sr)

plt.figure()
plt.plot(x1,signalwindow)
plt.xlabel('points')
plt.ylabel('wave')
plt.title('aa firstframe hanningwindow wave',fontsize=12,color='black')
plt.show()
plt.figure()
plt.plot(x2,endframe[0])
plt.xlabel('times')  #x轴
plt.ylabel('wave')  #y轴
plt.title('aa firstframe hanningwindow wave',fontsize=12,color='black')
plt.show()