Re: Getting Pulseaudio and alsa to share one sound card

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when you are changing anyway, you can comment out the lines
loading module-udev-detect and module-detect near the top of the file. Usually,
module-detect is not loaded anyway. Also, you can load module-alsa-sink and
module-alsa-source at the same place. If you take a look at, there are
some examples.


On 08.05.24 19:02, Richard Reina wrote:

Thanks for the idea George. I tried using dmix with the instructions in the link that you provided above but it instructs to create a .pa file in the directory: /etc/pulse/ but this is a directory that does not exist on the RPI. I have tried appending the lines:

unload-module module-udev-detect
unload-module module-detect
load-module module-alsa-sink device=dmix
load-module module-alsa-source device=dsnoop

to my /etc/pulse/ but that causes aplay to give a busy error: aplay: main:830: audio open error: Device or resource busy and Moode to also still give one as well.

El mar, 7 may 2024 a las 14:59, Georg Chini (<georg@xxxxxxxx>) escribió:


mh, looks like you have a problem then. Pulseaudio exclusively opens the sound devices, so
if the player cannot be configured to use the alsa default device, it will not work. You could
try using dmix ( chapter 5.1.3, just used Google,
did not check the content)

The only other option left is to start the player with pasuspender, but then again ledfx won't
work while the player is active.


On 07.05.24 21:50, Richard Reina wrote:
$ aplay -L
    Discard all samples (playback) or generate zero samples (capture)
    Playback/recording through the PulseAudio sound server
    Rate Converter Plugin Using Libav/FFmpeg Library
    Rate Converter Plugin Using Samplerate Library
    Rate Converter Plugin Using Speex Resampler
    JACK Audio Connection Kit
    Open Sound System
    PulseAudio Sound Server
    Plugin for channel upmix (4,6,8)
    Plugin for channel downmix (stereo) with a simple spacialization
    snd_rpi_hifiberry_dacplus, HiFiBerry DAC+ HiFi pcm512x-hifi-0
    Direct hardware device without any conversions
    snd_rpi_hifiberry_dacplus, HiFiBerry DAC+ HiFi pcm512x-hifi-0
    Hardware device with all software conversions
    snd_rpi_hifiberry_dacplus, HiFiBerry DAC+ HiFi pcm512x-hifi-0
    Default Audio Device
    snd_rpi_hifiberry_dacplus, HiFiBerry DAC+ HiFi pcm512x-hifi-0
    Direct sample mixing device
    USB Stream Output

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


so what's the output of aplay -L?


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:


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

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


    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.


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?

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
  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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