Question

嗨，所以我的Windows机器上的程序运行良好，但是我在树莓派上遇到了错误，我不确定为什么，因为据我所知，在分配之前没有引用数据。我不确定该如何解决此问题，将不胜感激。这是代码

import pyaudio
import numpy
import math
import matplotlib.pyplot as plt
import matplotlib.animation
from multiprocessing import Process
import time
RATE = 44100
BUFFER = 882

p = pyaudio.PyAudio()

stream = p.open(
    format = pyaudio.paFloat32,
    channels = 1,
    rate = RATE,
    input = True,
    output = False,
    frames_per_buffer = BUFFER
)

fig = plt.figure()
line1 = plt.plot([],[])[0]
line2 = plt.plot([],[])[0]

r = range(0,int(RATE/2+1),int(RATE/BUFFER))
l = len(r)

def init_line():
        line1.set_data(r, [-1000]*l)
        line2.set_data(r, [-1000]*l)
        return (line1,line2,)
# def grab():
#         time.sleep(3)
#         print(line1.get_data())
#         # return (line1,line2,)
def update_line(i):
    try:
        data = numpy.fft.rfft(numpy.fromstring(
            stream.read(BUFFER), dtype=numpy.float32)
        )
    except IOError:
        pass
    data = numpy.log10(numpy.sqrt(
        numpy.real(data)**2+numpy.imag(data)**2) / BUFFER) * 10
    line1.set_data(r, data)
    line2.set_data(numpy.maximum(line1.get_data(), line2.get_data()))
    # print(data[0])
    if data[0] > -30:
        print("red")
    elif data[0] <-30 and data[0]>-50:
        print("amber")
    else: print("green")
    # if linee2[0].any() >2000:
    #     print("red")
    # else: print("green")
    return (line1,line2,)

plt.xlim(0, RATE/2+1)
plt.ylim(-60, 0)
plt.xlabel('Frequency')
plt.ylabel('dB')
plt.title('Spectrometer')
plt.grid()

line_ani = matplotlib.animation.FuncAnimation(
    fig, update_line, init_func=init_line, interval=0, blit=True
)

plt.show()

这是运行时输出的错误

    numpy.real(data)**2+numpy.imag(data)**2) / BUFFER) * 10
UnboundLocalError: local variable 'data' referenced before assignment```

树莓派上的python pyaudio错误

0 个答案: