Hi Mycrofters,
Got a new boombox prototype (which frickin cranks! … more later) and picked up a new microphone. I set up Mycroft from my docs, and it came up with a pairing code. I paired it and tried a basic command. No dice - Mycroft could not use the new mic. I found this in voice.log:
$ tail -22 voice.log
2022-03-19 08:49:13.974 | INFO | 2123 | mycroft.client.speech.hotword_factory:load_module:500 | Loading "hey mycroft" wake word via precise
2022-03-19 08:49:16.863 | INFO | 2123 | mycroft.client.speech.listener:create_wakeup_recognizer:365 | creating stand up word engine
2022-03-19 08:49:16.868 | INFO | 2123 | mycroft.client.speech.hotword_factory:load_module:500 | Loading "wake up" wake word via pocketsphinx
2022-03-19 08:49:17.129 | INFO | 2123 | __main__:on_ready:179 | Speech client is ready.
Expression 'paInvalidSampleRate' failed in 'src/hostapi/alsa/pa_linux_alsa.c', line: 2048
Expression 'PaAlsaStreamComponent_InitialConfigure( &self->capture, inParams, self->primeBuffers, hwParamsCapture, &realSr )' failed in 'src/hostapi/alsa/pa_linux_alsa.c', line: 2718
Expression 'PaAlsaStream_Configure( stream, inputParameters, outputParameters, sampleRate, framesPerBuffer, &inputLatency, &outputLatency, &hostBufferSizeMode )' failed in 'src/hostapi/alsa/pa_linux_alsa.c', line: 2842
Exception in thread Thread-8:
Traceback (most recent call last):
File "/usr/lib/python3.8/threading.py", line 932, in _bootstrap_inner
self.run()
File "/home/pi/mycroft-core/mycroft/client/speech/listener.py", line 79, in
run
with self.mic as source:
File "/home/pi/mycroft-core/mycroft/client/speech/mic.py", line 140, in __enter__
return self._start()
File "/home/pi/mycroft-core/mycroft/client/speech/mic.py", line 147, in _start
self.stream = MutableStream(self.audio.open(
File "/home/pi/mycroft-core/.venv/lib/python3.8/site-packages/pyaudio.py", line 750, in open
stream = Stream(self, *args, **kwargs)
File "/home/pi/mycroft-core/.venv/lib/python3.8/site-packages/pyaudio.py", line 441, in __init__
self._stream = pa.open(**arguments)
OSError: [Errno -9997] Invalid sample rate
So it seems Mycroft does not like either the sample rate or the fact that the mic has two channels.
I also got an error from the helper script testrecord that I wrote because I can never remember the arecord args to make a sample recording. I tried to fix it by querying the microphone’s attributes as follows:
$ cat /usr/local/sbin/testrecord
#!/bin/bash
#
# test recording with default microphone
#
# get microphone's sample rate, # of channels and format
rate=`grep rate: /proc/asound/card*/pcm0c/sub0/hw_params | awk '{print $2}'` # there could be multiple mic's
if [ ${#rate} = 0 ]; then # no mic found
echo "ERROR: no microphone found with command grep rate: /proc/asound/card*/pcm0c/sub0/hw_params"
exit 4 # cannot perform operation
fi
channels=`grep channels: /proc/asound/card*/pcm0c/sub0/hw_params | awk '{print $2}'`
if [ ${#channels} = 0 ]; then # number of channels not found
echo "WARNING: did not find number of channels - assuming 1"
channels=1 # assume 1 channel
fi
format=`grep ^format: /proc/asound/card*/pcm0c/sub0/hw_params | awk '{print $2}'`
if [ ${#format} = 0 ]; then # format not found
echo "WARNING: did not find number of channels - ignoring" # leave empty
else
format="-f $format" # add -f flag
fi
# put the arecord command together and run it
cmd="arecord $format -c $channels -d 5 -r $rate /tmp/test-mic.wav"
echo "Testing your microphone for 5 seconds - SAY SOMETHING!"
echo "INFO: running command: $cmd"
$cmd # run the command
rc=$?
if [ "$rc" != 0 ]; then # something didn't work
echo "ERROR: command $cmd failed with $rc"
exit $rc # not successful
fi
So maybe some of the code techniques in the bash code to glean the sample rate, channels and format could be used in the Python file pyaudio.py?
Just a thought … hope this helps
-Mike M