ReSpeaker 4 Mic Array issue in Pyaudio

[Alex-Beh]

Hi, I am using ReSpeaker 4 Mic Array with Raspberry pi 4. I run the following simple python script but I didn't see the ReSpeaker 4 Mic Array in the list. It works previously but don't know why suddenly it din't work now. It didn't show in pacmd list-sources also.

!/usr/bin/env python3

import pyaudio

fields = ('index', 'name', 'defaultSampleRate', 'maxInputChannels')

pa = pyaudio.PyAudio() print("------------------- show_audio_devices --------------------") for i in range(pa.get_device_count()): info = pa.get_device_info_by_index(i) print(', '.join("'%s': '%s'" % (k, str(info[k])) for k in fields)) pa.terminate()

arecord -L show the same output in the README.md .

[HinTak]

Against the 6-mics, here is the result:

------------------- show_audio_devices --------------------
'index': '0', 'name': 'seeed-8mic-voicecard: bcm2835-i2s-ac10x-codec0 ac10x-codec0-0 (hw:1,0)', 'defaultSampleRate': '44100.0', 'maxInputChannels': '8'
'index': '1', 'name': 'upmix', 'defaultSampleRate': '44100.0', 'maxInputChannels': '0'
'index': '2', 'name': 'vdownmix', 'defaultSampleRate': '44100.0', 'maxInputChannels': '0'
'index': '3', 'name': 'ac108', 'defaultSampleRate': '48000.0', 'maxInputChannels': '128'
'index': '4', 'name': 'dmixer', 'defaultSampleRate': '48000.0', 'maxInputChannels': '0'
'index': '5', 'name': 'ac101', 'defaultSampleRate': '48000.0', 'maxInputChannels': '128'
'index': '6', 'name': 'dmix', 'defaultSampleRate': '48000.0', 'maxInputChannels': '0'
'index': '7', 'name': 'default', 'defaultSampleRate': '48000.0', 'maxInputChannels': '128'

BTW, there are a few indentation errors in your code. It should be:

#!/usr/bin/env python3
import pyaudio

fields = ('index', 'name', 'defaultSampleRate', 'maxInputChannels')

pa = pyaudio.PyAudio()
print("------------------- show_audio_devices --------------------")
for i in range(pa.get_device_count()):
    info = pa.get_device_info_by_index(i)
    print(', '.join("'%s': '%s'" % (k, str(info[k])) for k in fields))
pa.terminate()

also from another thread, it appears that some people have DIY-compiled/installed pyaudio/ portaudio, which can break when system libraries are upgraded, etc. You should be able to get pyaudio and portaudio automatically from raspbian. Here is what sudo apt search pyaudio shows on mine:

python3-pyaudio/stable,now 0.2.11-1+b2 armhf [installed]
  Python3 bindings for PortAudio v19

Note the [installed] at the end.

and running sudo apt search portaudio (the automatic means it was installed as a dependency of another package).

...
libportaudio2/stable,now 19.6.0-1+deb10u1 armhf [installed,automatic]
  Portable audio I/O - shared library
...
python3-pyaudio/stable,now 0.2.11-1+b2 armhf [installed]
  Python3 bindings for PortAudio v19
...

and make sure you are *not using pip or pip3 to install pyaudio!!

[Alex-Beh]

Sorry the few indentation errors happened when I copy and paste the code.

Your output is correct, the seeed-8mic-voicecard should appear inside the list. But it didn't appear for my case. I use the two commands that you shared and the output is the same as you. How do I make sure my pyaudio is not installed from pip3?

[HinTak]

Try running i2cdetect -y -a 1 ; you should see some UU's.

[Alex-Beh]

Hi, this is the output:

     0  1  2  3  4  5  6  7  8  9  a  b  c  d  e  f
00: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
20: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
30: -- -- -- -- -- -- -- -- -- -- -- UU -- -- -- -- 
40: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
50: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
60: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
70: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 

[Alex-Beh]

I managed to see the my microphone in show_audio_devices.

'index': '0', 'name': 'bcm2835 Headphones: - (hw:0,0)', 'defaultSampleRate': '44100.0', 'maxInputChannels': '0'
'index': '1', 'name': 'seeed-4mic-voicecard: bcm2835-i2s-ac10x-codec0 ac10x-codec.1-003b-0 (hw:1,0)', 'defaultSampleRate': '44100.0', 'maxInputChannels': '4'

The issue happened when I start the microphone from a systemctl service. I switch off the service and then everything back to normal. Will update here when I found the solution.

[HinTak]

What do you mean by "start the microphone from a systemctl service"? The audio device needs to be accessed by either root or one of the audio group members (of which the user "pi" is one), and many GUI / console login also set up the interactive users to have the correct access rights. If you are doing recording via a service, etc (e.g. From a web server script), you need to make sure the service either has root or "audio" group permissions. (the latter is better).

Read up about "suid" - basically you want your script to be owned by the "audio" group and also set the set-group-id part of the file permission.

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[ghost]

@Alex-Beh , This action was performed automatically. Please describe the issue according to bug template - if the issue was resolved, ignore this message. The issue will be marked as closed in 7 days if inactive.

Describe the bug A clear and concise description of what the bug is.

To Reproduce Steps to reproduce the behavior:

1. Go to '...'
2. Click on '....'
3. Scroll down to '....'
4. See error

Expected behavior A clear and concise description of what you expected to happen.

Platform What platform are you running the code on.

• Device: [e.g. Raspberry Pi 4]
• OS: [e.g. Raspbian OS 32bit kernel version ...]
• Version/commit number [e.g. d1816f5]

Relevant log output Please copy and paste any relevant log output.

[AIWintermuteAI]

Hello, @Alex-Beh ! I wasn't able to reproduce the bug you're describing.

My setup: reTerminal (Raspberry Pi CM4 based development board) 5.10.17-v7l+ kernel 41a09a3 reSpeaker 4-mic hat for raspberry pi

Experiment: run https://github.com/respeaker/4mics_hat/blob/master/recording_examples/get_device_index.py

Output:

pi@raspberrypi:~/4mics_hat/recording_examples $ python3 get_device_index.py 
ALSA lib pcm_asym.c:106:(_snd_pcm_asym_open) capture slave is not defined
ALSA lib pcm_dmix.c:1108:(snd_pcm_dmix_open) unable to open slave
ALSA lib pcm.c:2565:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.rear
ALSA lib pcm.c:2565:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.center_lfe
ALSA lib pcm.c:2565:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.side
ALSA lib pcm.c:2565:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.surround21
ALSA lib pcm.c:2565:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.surround21
ALSA lib pcm.c:2565:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.surround40
ALSA lib pcm.c:2565:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.surround41
ALSA lib pcm.c:2565:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.surround50
ALSA lib pcm.c:2565:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.surround51
ALSA lib pcm.c:2565:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.surround71
ALSA lib pcm.c:2565:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.hdmi
ALSA lib pcm.c:2565:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.hdmi
ALSA lib pcm.c:2565:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.modem
ALSA lib pcm.c:2565:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.modem
ALSA lib pcm.c:2565:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.phoneline
ALSA lib pcm.c:2565:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.phoneline
ALSA lib pcm_oss.c:377:(_snd_pcm_oss_open) Unknown field port
ALSA lib pcm_oss.c:377:(_snd_pcm_oss_open) Unknown field port
ALSA lib pcm_a52.c:823:(_snd_pcm_a52_open) a52 is only for playback
ALSA lib pcm_usb_stream.c:486:(_snd_pcm_usb_stream_open) Invalid type for card
ALSA lib pcm_usb_stream.c:486:(_snd_pcm_usb_stream_open) Invalid type for card
ALSA lib pcm_hw.c:1822:(_snd_pcm_hw_open) Invalid value for card
ALSA lib pcm_hw.c:1822:(_snd_pcm_hw_open) Invalid value for card
ALSA lib pcm_dmix.c:1108:(snd_pcm_dmix_open) unable to open slave
Input Device id  0  -  seeed-4mic-voicecard: bcm2835-i2s-ac10x-codec0 ac10x-codec0-0 (hw:2,0)
Input Device id  1  -  pulse
Input Device id  2  -  ac108
Input Device id  3  -  default

Experiment: run pacmd list-sources

Output:

pi@raspberrypi:~/4mics_hat/recording_examples $ pacmd list-sources
2 source(s) available.
  * index: 0
        name: <alsa_input.platform-soc_sound.multichannel-input>
        driver: <module-alsa-card.c>
        flags: HARDWARE DECIBEL_VOLUME LATENCY 
        state: SUSPENDED
        suspend cause: IDLE
        priority: 9000
        volume: front-left: 65536 / 100% / 0.00 dB,   front-right: 65536 / 100% / 0.00 dB,   rear-left: 65536 / 100% / 0.00 dB,   rear-right: 65536 / 100% / 0.00 dB
                balance 0.00
        base volume: 65536 / 100% / 0.00 dB
        volume steps: 65537
        muted: no
        current latency: 0.00 ms
        max rewind: 0 KiB
        sample spec: s32le 4ch 48000Hz
        channel map: front-left,front-right,rear-left,rear-right
                     Surround 4.0
        used by: 0
        linked by: 0
        fixed latency: 59.95 ms
        card: 0 <alsa_card.platform-soc_sound>
        module: 8
        properties:
                alsa.resolution_bits = "32"
                device.api = "alsa"
                device.class = "sound"
                alsa.class = "generic"
                alsa.subclass = "generic-mix"
                alsa.name = "bcm2835-i2s-ac10x-codec0 ac10x-codec0-0"
                alsa.id = "bcm2835-i2s-ac10x-codec0 ac10x-codec0-0"
                alsa.subdevice = "0"
                alsa.subdevice_name = "subdevice #0"
                alsa.device = "0"
                alsa.card = "2"
                alsa.card_name = "seeed-4mic-voicecard"
                alsa.long_card_name = "seeed-4mic-voicecard"
                alsa.driver_name = "snd_soc_seeed_voicecard"
                device.bus_path = "platform-soc:sound"
                sysfs.path = "/devices/platform/soc/soc:sound/sound/card2"
                device.form_factor = "internal"
                device.string = "hw:2"
                device.buffering.buffer_size = "42304"
                device.buffering.fragment_size = "10576"
                device.access_mode = "mmap"
                device.profile.name = "multichannel-input"
                device.profile.description = "Multichannel"
                device.description = "Built-in Audio Multichannel"
                module-udev-detect.discovered = "1"
                device.icon_name = "audio-card"
        ports:
                multichannel-input: Multichannel Input (priority 0, latency offset 0 usec, available: unknown)
                        properties:

        active port: <multichannel-input>
    index: 1
        name: <auto_null.monitor>
        driver: <module-null-sink.c>
        flags: DECIBEL_VOLUME LATENCY DYNAMIC_LATENCY
        state: SUSPENDED
        suspend cause: IDLE
        priority: 1000
        volume: front-left: 65536 / 100% / 0.00 dB,   front-right: 65536 / 100% / 0.00 dB
                balance 0.00
        base volume: 65536 / 100% / 0.00 dB
        volume steps: 65537
        muted: no
        current latency: 0.00 ms
        max rewind: 344 KiB
        sample spec: s16le 2ch 44100Hz
        channel map: front-left,front-right
                     Stereo
        used by: 0
        linked by: 0
        configured latency: 0.00 ms; range is 0.50 .. 2000.00 ms
        monitor_of: 0
        module: 16
        properties:
                device.description = "Monitor of Dummy Output"
                device.class = "monitor"
                device.icon_name = "audio-input-microphone"

Conclusion: Cannot reproduce the behavior you described. Perhaps you can share more information about your setup?

[Alex-Beh]

@Alex-Beh Basically the issue happened when I add my python script which using the microphone into systemctl service. I will see what I can share for the systemctl service setup during the weekend.

[AIWintermuteAI]

Hi @Alex-Beh ! May I inquiry, has the issue been resolved?

[AIWintermuteAI]

Closing the issue due to inactivity.