Question

我正在绘制来自audiojack的实时音频数据，并试图将整个信号放在一个图中（从第0秒到当前）;因此，我将音频信号附加到一个列表中（即“在我的情况下合并”）并一次又一次地绘制更新的列表，但随着数据的增加（即合并中的元素数量），绘图变得越来越慢。任何提高速度的建议，请记住，我需要从头到尾包含所有数据点，以包括情节。

请在下面找到我的代码

import pyaudio
import itertools
import numpy as np
import time
import matplotlib.pyplot as plt
from scipy.signal import butter, lfilter
import matplotlib.animation as animation

RATE = 44100
CHUNK = int(RATE/2) # RATE / number of updates per second

fig = plt.figure()
ax = fig.add_subplot(1,1,1)
ax.set_ylim([-1,1])
line, = ax.plot([], [],'-k',label='red')
ax.legend()


frames = []
# define callback (2)
def callback(in_data, frame_count, time_info, status):
# convert data to array
    data = (np.fromstring(in_data, dtype=np.float32))
    frames.append(data)
    return (in_data, pyaudio.paContinue)
if __name__=="__main__":

    # instantiate PyAudio (1)
    p = pyaudio.PyAudio()
    # open stream using callback (3)
    stream = p.open(format=pyaudio.paFloat32,
                    channels=1,
                    rate=RATE,
                    input=True,
                    frames_per_buffer=CHUNK,
                    stream_callback=callback)
    # start the stream (4)
    stream.start_stream()
    tt = 0
    xar = []
    while stream.is_active():
        if frames:
            t1 = time.time()
            def animate(i):
                #data is appended in the frames (global variable is pulled out every time one cycle of plotting is over
                data_out= frames.pop()
                xar.append(data_out.tolist())
                merged = list(itertools.chain.from_iterable(xar)) #merging of audio data 
                line.set_ydata(merged)
                line.set_xdata(range(len(merged)))
                ax.relim()
                ax.autoscale_view()
                data_filter = []
                data_out = []
                print((time.time() - t1) % 60)
            ani = animation.FuncAnimation(fig, animate, interval=1000)
            plt.show()
  # close stream and connection
   stream.close()
   p.terminate()
  # wait for stream to finish (5)

实时绘制包含图中所有数据点的音频信号

0 个答案: