Python 实时混音

Question

每次发送或接收数据包时，我都使用 scapy 和 pyaudio 播放一小段正弦波，声音的频率指示发件人地址。

sniff(prn = makeSound)

在此代码中，makeSound 函数获取一个数据包，对其进行分解，并根据发件人地址播放声音。

据我所知，pyaudio有阻塞模式和回调模式。在这两种模式下我都不能同时播放多个声音。

我需要一种方法来开始一个音符，并立即开始将其混合到音频流中，而不管正在播放的过程中已经有多少正弦波。

Answer 1

您需要自己进行混音。请参阅以下示例程序，了解如何将多种声音混合到一个单通道输出中。

 import struct
 import math
 import pyaudio
 from itertools import count

 pa = pyaudio.PyAudio()

 FORMAT = pyaudio.paFloat32
 CHANNELS = 1
 RATE = 44100

 OUTPUT_BLOCK_TIME = 0.05
 OUTPUT_FRAMES_PER_BLOCK = int(RATE*OUTPUT_BLOCK_TIME)


 def sine_gen():
     time = 0
     format = "%df" % OUTPUT_FRAMES_PER_BLOCK
     voices = []
     voices.append(lambda sampletime: math.sin(sampletime * math.pi * 2 * 440.0))

     for frame in count():
         block = []
         for i in xrange(OUTPUT_FRAMES_PER_BLOCK):
             sampletime = time + (float(i) / OUTPUT_FRAMES_PER_BLOCK) * OUTPUT_BLOCK_TIME
             sample = sum(voice(sampletime) for voice in voices) / len(voices)
             block.append(sample)
         yield struct.pack(format, *block)
         time += OUTPUT_BLOCK_TIME
         if frame == 20:
             voices.append(
                 lambda sampletime: math.sin(sampletime * math.pi * 2 * 880.0)
             )

 stream = pa.open(format=FORMAT,
     channels=CHANNELS, rate=RATE, output=1)

 for i, block in enumerate(sine_gen()):
     stream.write(block)

Python 实时混音

Python real time audio mixing

python

scapy

pyaudio