解决pyaudio播放声音不清晰的问题

今天在树莓派上使用pyaudio播放pcm文件的时候，发现明显的不清晰，感觉有轻微的断断续续，而使用aplay播放则非常清晰
测试文件：https://sis-sample-audio.obs.cn-north-1.myhuaweicloud.com/16k16bit.pcm

>>> import pyaudio
>>> p = pyaudio.PyAudio()
>>> stream = p.open(format=pyaudio.paInt16, channels=1, output=True)
>>> with open("16k16bit.pcm", "rb") as f:
...     stream.write(f.read())

>>> aplay -f cd -c 1 -r 16000 16k16bit.pcm

最后发现是由于缓冲区的帧数过少导致播放不流畅，默认pyaudio缓冲区的帧数为1024。可以通过提高frames_per_buffer参数值来解决。

>>> import pyaudio
>>> p = pyaudio.PyAudio()
>>> stream = p.open(format=pyaudio.paInt16, channels=1, rate=16000, frames_per_buffer=4096, output=True)
>>> with open("16k16bit.pcm", "rb") as f:
...     stream.write(f.read())

参考：
https://bbs.youkuaiyun.com/topics/330052867
https://people.csail.mit.edu/hubert/pyaudio/docs/#class-stream