pyaudio - record a wav file

用pyalsaaudio碰到一些問題，改用pyaudio

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#!/usr/bin/python3

import pyaudio
import wave

FORMAT = pyaudio.paInt16
CHANNELS = 1
RATE = 16000
CHUNK = 512
RECORD_SECONDS = 5
WAVE_OUTPUT_FILENAME = "record.wav"
audio = pyaudio.PyAudio()

print("----------------------record device list---------------------")
info = audio.get_host_api_info_by_index(0)
numdevices = info.get('deviceCount')
for i in range(0, numdevices):
        if (audio.get_device_info_by_host_api_device_index(0, i).get('maxInputChannels')) > 0:
            print ("Input Device id ", i, " - ", audio.get_device_info_by_host_api_device_index(0, i).get('name'))

print("-------------------------------------------------------------")

index = (input())
print("recording via index "+str(index))

stream = audio.open(format=FORMAT, channels=CHANNELS,
                rate=RATE, input=True,input_device_index = int(index),
                frames_per_buffer=CHUNK)

print ("recording started")
Recordframes = []

for i in range(0, int(RATE / CHUNK * RECORD_SECONDS)):
    data = stream.read(CHUNK)
    Recordframes.append(data)
print ("recording stopped")

stream.stop_stream()
stream.close()
audio.terminate()

waveFile = wave.open(WAVE_OUTPUT_FILENAME, 'wb')
waveFile.setnchannels(CHANNELS)
waveFile.setsampwidth(audio.get_sample_size(FORMAT))
waveFile.setframerate(RATE)
waveFile.writeframes(b''.join(Recordframes))
waveFile.close()

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ref: Here