Getting Pulseaudio and alsa to share one sound card

[Georg Chini]

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 at gmail.com>) 
> 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 at gmail.com> 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 at gmail.com>) 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 at gmail.com> 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]
>
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