接上一个问题，出不来图像

Question

import struct
import numpy as np
import matplotlib.pyplot as plt
CHUNK = 1024 * 4
FORMAT = pyaudio.paInt16
CHANNELS = 1
RATE = 44100
p = pyaudio.PyAudio()
stream = p.open(
    format=FORMAT,
    channels=CHANNELS,
    rate=RATE,
    input=True,
    output=True,
    frames_per_buffer=CHUNK
)

fig, ax = plt.subplots()


x = np.arange(0, 2 * CHUNK, 2)
line, = ax.plot(x, np.random.rand(CHUNK))
ax.set_ylim(0, 255)
ax.set_xlim(0, CHUNK)

while True:
    data = stream.read(CHUNK)
    data_int = np.array(struct.unpack(str(2 * CHUNK) + 'B', data), dtype='b')[::2] + 127
    line.set_ydata(data_int)
    fig.canvas.draw()
    fig.canvas.flush_events()

Answer 1

试试这样写：

import numpy as np
import matplotlib.pyplot as plt
from matplotlib.animation import FuncAnimation
import pyaudio

CHUNK = 1024
FORMAT = pyaudio.paInt16
CHANNELS = 1
RATE = 44100

p = pyaudio.PyAudio()
stream = p.open(
    format=FORMAT,
    channels=CHANNELS,
    rate=RATE,
    input=True,
    output=True,
    frames_per_buffer=CHUNK
)

fig, ax = plt.subplots()
 
x = np.arange(CHUNK)
line, = ax.plot(x, np.random.rand(CHUNK), lw=1, animated=True)
ax.set_ylim(0, 255)
ax.set_xlim(0, CHUNK)

def update_data(i):
    data = stream.read(CHUNK)
    data = np.frombuffer(data, dtype=np.int16)
    plt.setp(line, 'ydata', data[:CHUNK])
    return [line]

ani = FuncAnimation(fig, update_data, blit=True, interval=25, frames=1000)
plt.show()