在Python中调用3G调制解调器，使用PyAudio

Question

我有两个Python脚本。第一个脚本是用AT命令进行调用，第二个脚本是接收音频并把它发送到电脑的麦克风。现在的问题是，当我发送音频时，调制解调器要么重启，要么反应很慢，听不清楚。

第一个脚本（docall.py）

import serial

se = serial.Serial()
se.port = 5
se.baudrate = 9600 # may be different
se.timeout = 0.5

a=1
se.open()
cont=0
while (a==1):
 if not se.isOpen():
  se.open()
 if cont == 1:
  se.write('AT+CHUP;\r\n')
  se.write('ATD*264;\r\n')
 if cont == 2:
  se.write('AT^DDSETEX?;\r\n')
 if cont == 3:
  se.write('AT^DDSETEX=2;\r\n')

 line = se.read(1024)
 print (line)
 cont=cont+1

se.close()

---

第二个脚本（audio.py）

import serial
import pyaudio
import wave
import time

CHUNK = 1024
FORMAT = pyaudio.paInt16
CHANNELS = 1
RATE = 8000
RECORD_SECONDS = 10
WIDTH = 2

pe = pyaudio.PyAudio()

stream= pe.open(format=pe.get_format_from_width(WIDTH),
                channels=CHANNELS,
                rate=RATE,
                output=True,
                frames_per_buffer=CHUNK)

mic= pe.open(format=pyaudio.paInt16,
                channels=1,
                rate=8000,
                input=True,
                frames_per_buffer=128)

se = serial.Serial()
se.port = 3
se.baudrate = 9600 # may be different
se.timeout = 0.5
se.open()
se.writeTimeout = 0

streaming = []
frames = []
while True:
 re= se.read(CHUNK)
 stream.write(re)
 se.write(mic.read(612))

Answer 1

你需要把帧缓冲区设置为160，这样才能和设备的速率匹配。我正在使用pa设备的回调函数来进行设备的读写，关键的数字是每个缓冲区320帧。

device = Serial('/dev/tty.HUAWEIMobile-Diag', timeout=None,  writeTimeout=0)

time.sleep(0.1) #this sleep needed for device buffer clean
device.flush()
device.flushInput()
device.flushOutput()

uni_stream = pe.open(format=pyaudio.paInt16,
                     channels=1,
                     rate=8000,
                     input=True,
                     output=True,
                     frames_per_buffer=160, stream_callback=uni_callback)

def uni_callback(in_data, frame_count, time_info, status):
    data = device.read(320)
    device.write(in_data)

    return (data, pyaudio.paContinue)