Re: Getting Pulseaudio and alsa to share one sound card

[Richard Reina <gatorreina@xxxxxxxxx>]

$ aplay -L
null
    Discard all samples (playback) or generate zero samples (capture)
default
    Playback/recording through the PulseAudio sound server
lavrate
    Rate Converter Plugin Using Libav/FFmpeg Library
samplerate
    Rate Converter Plugin Using Samplerate Library
speexrate
    Rate Converter Plugin Using Speex Resampler
jack
    JACK Audio Connection Kit
oss
    Open Sound System
pulse
    PulseAudio Sound Server
upmix
    Plugin for channel upmix (4,6,8)
vdownmix
    Plugin for channel downmix (stereo) with a simple spacialization
_audioout
_audioout__
alsaequal
plug_alsaequal
btstream
camilladsp
crossfeed
plug_bs2b
eqfa12p
plug_eqfa12p
invpolarity
trx_send
hw:CARD=sndrpihifiberry,DEV=0
    snd_rpi_hifiberry_dacplus, HiFiBerry DAC+ HiFi pcm512x-hifi-0
    Direct hardware device without any conversions
plughw:CARD=sndrpihifiberry,DEV=0
    snd_rpi_hifiberry_dacplus, HiFiBerry DAC+ HiFi pcm512x-hifi-0
    Hardware device with all software conversions
sysdefault:CARD=sndrpihifiberry
    snd_rpi_hifiberry_dacplus, HiFiBerry DAC+ HiFi pcm512x-hifi-0
    Default Audio Device
dmix:CARD=sndrpihifiberry,DEV=0
    snd_rpi_hifiberry_dacplus, HiFiBerry DAC+ HiFi pcm512x-hifi-0
    Direct sample mixing device
usbstream:CARD=sndrpihifiberry
    snd_rpi_hifiberry_dacplus
    USB Stream Output

El mar, 7 may 2024 a las 14:44, Georg Chini (<georg@xxxxxxxx>) escribió:

Hi,

so what's the output of aplay -L?

Regards
               Georg

On 07.05.24 21:12, Richard Reina wrote:

Hello Georg, Thank you for the reply. Yes Moode accesses alsa directly and unfortunately there is no option for making it use pulse.

El mar, 7 may 2024 a las 13:33, Georg Chini (<georg@xxxxxxxx>) escribió:

Hello,

maybe you don't have the alsa config for pulseaudio. Normally aplay -L
shows that the default device points to pulse:

null
    Discard all samples (playback) or generate zero samples (capture)
default
    Playback/recording through the PulseAudio sound server

...

pulse
    PulseAudio Sound Server

...

I guess the Moode audio player tries to access the ALSA device directly
and fails because the device is already in use by pulseaudio. There might
also be a configuration option in the player to make it use pulse.

Regards
              Georg

On 07.05.24 18:34, Richard Reina wrote:

Yes it's a requirement. Setting the audio device to pulse in Ledfx is the only way it will work. 

El mar, 7 may 2024 a las 11:21, Mark Gaiser (<markg85@xxxxxxxxx>) escribió:

Have you tried changing your device in ledfx to pulse?

https://ledfx.readthedocs.io/en/latest/directing_audio.html

Again no idea if this works, I don't know nor use ledfx :) Just trying to help out.

On Tue, May 7, 2024 at 6:14 PM Richard Reina <gatorreina@xxxxxxxxx> wrote:

Hi Mark,

Thank you for the reply.  paplay also works but there's no change. It's not the playing of the song that locks up the device and causes Moode audio not to be able to use it, it's the starting of ledfx. Once I do systemctl start ledfx the moode audio player can no longer use the output device regardless if I play a sound file with aplay, paplay or don't play a sound file at all. Moode audio can't use the device until I do systemctl stop ledfx.

El mar, 7 may 2024 a las 10:48, Mark Gaiser (<markg85@xxxxxxxxx>) escribió:

Can you use paplay instead?

That is the pulseaudio aplay drop-in replacement.

I'm guessing you won't have "device or resource busy" errors when using paplay.

I did not test this! But do let us know if it works for you :)

On Tue, May 7, 2024 at 3:24 PM Richard Reina <gatorreina@xxxxxxxxx> wrote:

I have a Raspberry Pi 3b with a Hifiberry Amp4/DAC hat runs Moode Audio OS.

If I pick Pulse as they audio device in LedFx and play a sound file with aplay sound_file.wav my leds react to the music.

The problem is that after aplay has finished playing the sound file if I then go try to use Moode audio player Moode audio won't play music and gives me the following error:

MPD error Failed to open "ALSA Default" (alsa); Failed to open ALSA device "_audioout": Device or resource busy

This persists until I stop Ledfx. Is there a way I can switch back and forth between aplay and Moode Audio player without having to stop and start Ledfx? I am not looking to get LedFx working with Moode I only want reactive lights when I play a song with aplay.

$ aplay -l

**** List of PLAYBACK Hardware Devices ****

card 0: sndrpihifiberry [snd_rpi_hifiberry_dacplus], device 0: HiFiBerry DAC+ HiFi pcm512x-hifi-0 [HiFiBerry DAC+ HiFi pcm512x-hifi-0]

Subdevices: 0/1

Subdevice #0: subdevice #0

$ amixer
Simple mixer control 'Master',0
  Capabilities: pvolume pswitch pswitch-joined
  Playback channels: Front Left - Front Right
  Limits: Playback 0 - 65536
  Mono:
  Front Left: Playback 65536 [100%] [on]
  Front Right: Playback 65536 [100%] [on]
Simple mixer control 'Capture',0
  Capabilities: cvolume cswitch cswitch-joined
  Capture channels: Front Left - Front Right
  Limits: Capture 0 - 65536
  Front Left: Capture 65536 [100%] [on]
  Front Right: Capture 65536 [100%] [on]