Differences

This shows you the differences between two versions of the page.

Link to this comparison view

Both sides previous revision Previous revision
Next revision
Previous revision
wiki:raspberrypi [2017/05/18 22:59]
colinsullivan [Running JACK] - more specifics to help newbies
wiki:raspberrypi [2020/03/15 17:50] (current)
autostatic [On-board audio]
Line 97: Line 97:
 ===== On-board audio ===== ===== On-board audio =====
  
-The on-board chipset of the RPi has quite some limitations unfortunately. It only does playback and because of it'​s ​design it is not really suited for real-time, low-latency audio processing. It does work with JACK now that it has MMAP support but don't expect it to run without glitches at lower latencies.+The on-board chipset of the RPi has quite some limitations unfortunately. It only does playback and because of its PWM (Pulse Wide Modulation) based design it is not really suited for real-time, low-latency audio processing. It does work with JACK now that it has MMAP support but don't expect it to run without glitches at lower latencies.
  
 Other drawbacks of the analog audio output: Other drawbacks of the analog audio output:
Line 169: Line 169:
 Another option is to comment or remove the kernel module for the onboard soundcard (snd-bcm2835) from ''/​etc/​modules''​. Keep in mind this will disable the onboard sound altogether. This might save you some precious CPU cycles too but don't expect too much of it. Another option is to comment or remove the kernel module for the onboard soundcard (snd-bcm2835) from ''/​etc/​modules''​. Keep in mind this will disable the onboard sound altogether. This might save you some precious CPU cycles too but don't expect too much of it.
  
-===== Audio software repository ===== 
  
-There'​s a [[http://​rpi.autostatic.com/​|repository]] available with packages of Jack1, Jack2 (both patched for use on ARM) and a small collection of software that is either not available or not up to date in the standard Raspbian repositories. 
- 
-==== Adding the repository ==== 
- 
-  wget -O - http://​rpi.autostatic.com/​autostatic.gpg.key| sudo apt-key add - 
-  sudo wget -O /​etc/​apt/​sources.list.d/​autostatic-audio-raspbian.list http://​rpi.autostatic.com/​autostatic-audio-raspbian.list 
-  sudo apt-get update 
  
 ===== Using JACK ===== ===== Using JACK =====
Line 226: Line 218:
           <allow own="​org.freedesktop.ReserveDevice1.Audio1"/>​           <allow own="​org.freedesktop.ReserveDevice1.Audio1"/>​
     </​policy>​     </​policy>​
 +    ​
 +WARNING: In Raspbian Stretch I had to do the following instead of modifying ''​system.conf'':​
 +
 +Create a new file ''/​etc/​dbus-1/​system-local.conf''​ with the following contents:
 +
 +    <?xml version="​1.0"?>​ <​!--*-nxml-*-->​
 +    <​!DOCTYPE busconfig PUBLIC "​-//​freedesktop//​DTD D-BUS Bus Configuration 1.0//​EN"​
 +            "​http://​www.freedesktop.org/​standards/​dbus/​1.0/​busconfig.dtd">​
 +    ​
 +    <​busconfig>​
 +    ​
 +            <policy context="​default">​
 +                    <allow own="​org.freedesktop.ReserveDevice1.Audio0"/>​
 +                    <allow own="​org.freedesktop.ReserveDevice1.Audio1"/>​
 +            </​policy>​
 +    ​
 +    </​busconfig>​
 +
 +
  
 === Using an external USB audio interface === === Using an external USB audio interface ===
wiki/raspberrypi.1495141155.txt.gz ยท Last modified: 2017/05/18 22:59 by colinsullivan