Re: Getting Pulseaudio and alsa to share one sound card

Georg Chini <georg@xxxxxxxx> · Tue, 7 May 2024 20:33:18 +0200



    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]