Audio device unknown errors (PJMEDIA_EAUD_SYSERR status=420002) with I2S / ALSA on Raspberry Pi

Michael Thomson <mike@xxxxxxxxxxxxx> · Fri, 2 Mar 2018 18:29:28 +0000

Hi folks
I have a working Raspberry Pi GPIO connected audio interface that I want to build into a PJSIP-based project.
I am able to record from the MEMS microphone and play back through the amplifier at a variety of sample rates, bit depths and in mono or stereo, using the default capture and playback ALSA devices.

However I’m completely *un*able to figure out why pjsystest can find the devices, but doesn’t seem able to use them.

I’ve searched every combination of I2S, pjsip, pjsua, ALSA, and the error messages and read the PJSIP Audio troubleshooting Wiki page without a lightbulb coming on to illuminate my ignorance.
Any help would be gratefully received, as I suspect I’m missing something very fundamental and therefore so simple it doesn’t end up in a FAQ...

Pastebin contains more gory details, I’ve only included the summary here:

pjsystest audio device failure(https://pastebin.com/52UbvQpz)

17:42:56.473      systest.c  Running Audio Tone Playback Test
17:42:56.474    pjsua_aud.c  Conf connect: 1 --> 0
17:42:56.474    pjsua_aud.c  .Set sound device: capture=-1, playback=-2
17:42:56.474    pjsua_aud.c  ..Opening sound device (speaker + mic) PCM@8000/1/20ms
17:42:56.482     alsa_dev.c  ...ALSA lib pcm_direct.c:931:(snd1_pcm_direct_initialize_slave) snd_pcm_hw_params_any failed
17:42:56.482     alsa_dev.c  ...ALSA lib pcm_dsnoop.c:629:(snd_pcm_dsnoop_open) unable to initialize slave
17:42:56.483    pjsua_aud.c  ..Opening sound device (speaker + mic) PCM@44100/1/20ms
17:42:56.489     alsa_dev.c  ...ALSA lib pcm_direct.c:931:(snd1_pcm_direct_initialize_slave) snd_pcm_hw_params_any failed
17:42:56.489     alsa_dev.c  ...ALSA lib pcm_dsnoop.c:629:(snd_pcm_dsnoop_open) unable to initialize slave
17:42:56.490    pjsua_aud.c  ..Opening sound device (speaker + mic) PCM@48000/1/20ms
17:42:56.495     alsa_dev.c  ...ALSA lib pcm_direct.c:931:(snd1_pcm_direct_initialize_slave) snd_pcm_hw_params_any failed
17:42:56.495     alsa_dev.c  ...ALSA lib pcm_dsnoop.c:629:(snd_pcm_dsnoop_open) unable to initialize slave
17:42:56.497    pjsua_aud.c  ..Opening sound device (speaker + mic) PCM@32000/1/20ms
17:42:56.503     alsa_dev.c  ...ALSA lib pcm_direct.c:931:(snd1_pcm_direct_initialize_slave) snd_pcm_hw_params_any failed
17:42:56.503     alsa_dev.c  ...ALSA lib pcm_dsnoop.c:629:(snd_pcm_dsnoop_open) unable to initialize slave
17:42:56.503    pjsua_aud.c  ..Opening sound device (speaker + mic) PCM@16000/1/20ms
17:42:56.509     alsa_dev.c  ...ALSA lib pcm_direct.c:931:(snd1_pcm_direct_initialize_slave) snd_pcm_hw_params_any failed
17:42:56.509     alsa_dev.c  ...ALSA lib pcm_dsnoop.c:629:(snd_pcm_dsnoop_open) unable to initialize slave
17:42:56.510    pjsua_aud.c  ..Opening sound device (speaker + mic) PCM@8000/1/20ms
17:42:56.516     alsa_dev.c  ...ALSA lib pcm_direct.c:931:(snd1_pcm_direct_initialize_slave) snd_pcm_hw_params_any failed
17:42:56.516     alsa_dev.c  ...ALSA lib pcm_dsnoop.c:629:(snd_pcm_dsnoop_open) unable to initialize slave
17:42:56.517    pjsua_aud.c  ..Unable to open sound device: Unknown error from audio driver (PJMEDIA_EAUD_SYSERR) [status=420002]
17:42:56.517    pjsua_aud.c  .Error opening sound device: Unknown error from audio driver (PJMEDIA_EAUD_SYSERR) [status=420002]

ALSA recording at 8kHz, L16, 1 channel (https://pastebin.com/EPn5a0e0)

pi@pibell:~/pjproject-2.7.2/pjsip-apps/bin $ arecord -r 8000  -fS16_LE -c 1 -v -twav -d5 test.wav
Recording WAVE 'test.wav' : Signed 16 bit Little Endian, Rate 8000 Hz, Mono

ALSA playback (https://pastebin.com/rqD08N8r)

pi@pibell:~/pjproject-2.7.2/pjsip-apps/bin $ aplay -v ./test.wav 
Playing WAVE './test.wav' : Signed 16 bit Little Endian, Rate 8000 Hz, Mono

alsa-info output (https://pastebin.com/pjHcqbWn)

!!ALSA configuration files
!!------------------------

!!System wide config file (/etc/asound.conf)

defaults.pcm.rate_converter "samplerate"  
pcm.pibell_amp {
    type hw
    card "PiBell"
    device 0
    subdevice 0
    channels 2
    rate 48000
    format S16_LE
}
pcm.pibell_mic {
    type hw
    card "PiBell"
    device 1
    subdevice 0
    channels 2
    rate 48000
    format S32_LE
}
pcm.pibell_playmixer {
    type dmix
    slave.pcm "pibell_amp"
    ipc_key 1987234 # Pseudo random, locally unique
    ipc_key_add_uid true
}
pcm.pibell_recmixer {
    type dsnoop
    slave.pcm "pibell_mic"
    slave.channels 2
    bindings.0 0
    bindings.1 0
    ipc_key 3491587 # Pseudo random, locally unique
    ipc_key_add_uid true
}
pcm.pibell_micboost {
    type softvol
    slave.pcm "pibell_recmixer"
    control.name "Boost Capture Volume"
    control.card "PiBell"
    min_dB -3.0
    max_dB 30.0
}
pcm.!default {
    type asym
    playback.pcm "plug:pibell_playmixer"
    capture.pcm "plug:pibell_micboost"
}

!!Aplay/Arecord output
!!--------------------

APLAY

**** List of PLAYBACK Hardware Devices ****
card 0: PiBell [PiBell], device 0: bcm2835-i2s-dit-hifi dit-hifi-0 []
  Subdevices: 1/1
  Subdevice #0: subdevice #0

ARECORD

**** List of CAPTURE Hardware Devices ****
card 0: PiBell [PiBell], device 1: bcm2835-i2s-ics43432-hifi ics43432-hifi-1 []
  Subdevices: 1/1
  Subdevice #0: subdevice #0

Cheers
Mike
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