Re: Volume mismatch between pulseaudio and alsa

Georg Chini <georg@xxxxxxxx> · Sat, 9 May 2020 11:18:59 +0200



    On 09.05.20 06:08, limh@xxxxxxxxx
      wrote:

    
      Hi 
      

      I so sorry that I sent a lot of mails these days. Now I
        summarize all the problems in this mail.
      

      Device: IMX6DL 
      Kernel: 4.1.15
      Environment: pulseaudio 8.0, alsa( alsactl -v : 1.1.0)
      

      Reason: 
          I
        used "mplayer" to play audio file in "system()" before (didn't
        open pulseaudio). 
          I
        want to optimized that so I use Qt function(based on
        pulseaudio).
          After
        I changed configuration to let the pulseaudio start when the
        system startup and I play audio with Qt, I found the volume was
        mismatch when I changed it in Qt function
          (*QSoundEffect::setVolume(), range:0.0 ~ 1.0,
          if volume is bigger than 0.1, the voice would be biggest)
          So I used "mplayer -af volume=[-20, -10, 0, 10]
          XXX.wav" to test again, then I found if the volume is bigger
          than -10, the voice would be biggest.
      

          I can attach the output of
          "paplay -v test.wav",but "aplay
          -Dplughw:0,0 test.wav"  just has a short
          "bit" voice either pulseaudio is opened or not.
      

      I hope you can give me a hand again
      PS: I also send a mail to alsa-user, you can follow
          it : https://sourceforge.net/p/alsa/mailman/message/37005410/
      

            Best Regards
            Mihan
          
        
    You should upgrade your software stack. Pulseaudio 8 is already 4
      years old and the kernel is even older.
    Regards

                    Georg

    
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