The question is related to this discussion ([link][1]).
@chris,
Your answer helps a lot. Thanks. My use case is the following: Upon an event on my Python script running on my PC, I need to send a command to the RPi to record 5 seconds from a USB microphone plugged to my RPi.
The Python script (I lost credit to ; sorry about that) runs well on RPi when I run it manually from PuTTY windows.
import pyaudio
import wave
form_1 = pyaudio.paInt16 # 16-bit resolution
chans = 1 # 1 channel
#samp_rate = 44100 # 44.1kHz sampling rate
samp_rate = 16000 # 16kHz sampling rate
chunk = 4096 # 2^12 samples for buffer
record_secs = 3 # seconds to record
dev_index = 2 # device index found by p.get_device_info_by_index(ii)
wav_output_filename = 'test1.wav' # name of .wav file
audio = pyaudio.PyAudio() # create pyaudio instantiation
# create pyaudio stream
stream = audio.open(format = form_1,rate = samp_rate,channels = chans, \
input_device_index = dev_index,input = True, \
frames_per_buffer=chunk)
print("recording")
frames = []
# loop through stream and append audio chunks to frame array
for ii in range(0,int((samp_rate/chunk)*record_secs)):
data = stream.read(chunk)
frames.append(data)
print("finished recording")
# stop the stream, close it, and terminate the pyaudio instantiation
stream.stop_stream()
stream.close()
audio.terminate()
# save the audio frames as .wav file
wavefile = wave.open(wav_output_filename,'wb')
wavefile.setnchannels(chans)
wavefile.setsampwidth(audio.get_sample_size(form_1))
wavefile.setframerate(samp_rate)
wavefile.writeframes(b''.join(frames))
wavefile.close()
On my PC I have the following script thanks to you @chris :
from paramiko import SSHClient, AutoAddPolicy
def Connect(ip, username='pi', pw='raspberry'):
'''ssh into the pi'''
print('connecting to {}@{}...'.format(username, ip))
ssh = SSHClient()
ssh.set_missing_host_key_policy(AutoAddPolicy())
ssh.connect(ip, username=username, password=pw)
print('connection status =', ssh.get_transport().is_active())
return ssh
def SendCommand(ssh, command, pw='password'):
'''send a terminal/bash command to the ssh'ed-into machine '''
print('sending a command... ', command)
stdin, stdout, stderr = ssh.exec_command( command )
if "sudo" in command:
stdin.write(pw+'\n')
stdin.flush()
out = stdout.read()
print(f'stout = {out}')
print(f'sterr = {stderr.read()}')
myssh = Connect(ip='192.168.x.y') #replace x and y by right value
SendCommand(myssh, command='sudo python ~/TestDirectory/TestAudio1.py')
But when I run it on my PC from Spyder I have the following output:
connecting to [email protected]... connection status = True sending a command... sudo python ~/TestDirectory/TestAudio1.py stout = b'recording\nfinished recording\n' sterr = b"ALSA lib confmisc.c:1281:(snd_func_refer) Unable to find definition 'cards.bcm2835.pcm.front.0:CARD=0'\n [etc etc] No such file or directory\nALSA lib pcm.c:2495:(snd_pcm_open_noupdate) Unknown PCM bluealsa\nconnect(2) call to /tmp/jack-0/default/jack_0 failed (err=No such file or directory)\nattempt to connect to server failed\n"
So the script starts well since I see "stout = b'recording\nfinished recording\n'" but then I have the sterr. Any clue where this issue is coming from? Thanks in advance for your help
EDIT April 16th 2019 Eventually I found out that, despite the big error message, the audio file was actually correctly created. So no worries anymore
