zz:PulseAudio 为什么不能启动

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转发三封邮件，发件人是 Will Woods (redhat)

1. 
   
2. Will Woods
   
3. 
   
4.         主题                Re: how is pulseaudio supposed to work?         
   
5.         邮送域                redhat.com         
   
6. 
   
7. On Thu, 2007-12-13 at 20:54 +0200, Pekka Savola wrote:
   
8. > Hi,
   
9. >
   
10. > Fedora 8 was working fine until I reinstalled it (but keeping my home
    
11. > dir intact).  How sound doesn't work on many applications.  This is
    
12. > likely a pulseaudio issue.
    
13. >
    
14. > Having looked at PulseAudio documentation, I haven't found out "the
    
15. > big picture", i.e., how it is supposed to work.  Should there be a
    
16. > daemon running or something?  Lot of docs also say "pulseaudio is now
    
17. > default" but I haven't found out where this can be configured i.e.
    
18. > where you can turn it off again [1] if you don't like it or check that
    
19. > everything is configured as required.
    
20. 
    
21. The default setup works like this:
    
22. 
    
23. 1) /etc/alsa/pulse-default.conf makes pcm.pulse the default ALSA device.
    
24. - This file is provided by alsa-plugins-pulseaudio.
    
25. 
    
26. 2) When you log in through gdm/kdm, HAL grants you read/write access to
    
27. the ALSA device nodes.
    
28. - This is handled by ConsoleKit, but wdm/xdm don't support it properly.
    
29. - Strictly speaking this has nothing to do with PulseAudio.
    
30. 
    
31. 3) When GNOME/KDE/etc start up, they start pulseaudio.
    
32. - Actually, GNOME starts ESD, but /usr/bin/esd -> esdcompat
    
33. - esdcompat is provided by pulseaudio-esound-compat
    
34. - kde-settings-pulseaudio provides /etc/kde/env/pulseaudio.sh
    
35. 
    
36. 4) Sound-using apps use ALSA/ESD as usual.
    
37. - It's all actually going through pulseaudio, though.
    
38. 
    
39. So - if you're not using GNOME or KDE, or if you're logging in through
    
40. xdm or wdm, or if you're missing some packages, audio might not work
    
41. right.
    
42. 
    
43. If you upgraded your system, the easiest thing to do is:
    
44. # sudo yum groupupdate sound-and-video gnome-desktop kde-desktop
    
45. (you can remove GNOME or KDE at your discretion)
    
46. 
    
47. Oh, and if something else has already claimed the ALSA device,
    
48. pulseaudio won't start properly. So you will want to make sure you get
    
49. the packages set up right and *then* log out and back in, or reboot.
    
50. 
    
51. If you really *must* disable PulseAudio, removing or renaming
    
52. /etc/alsa/pulse-default.conf is the easiest way.
    
53. 
    
54. Hope that helps,
    
55. 
    
56. -w
    
57. 
    
58. --
    
59. fedora-devel-list mailing list
    
60. fedora-devel-list@redhat.com
    
61. https://www.redhat.com/mailman/listinfo/fedora-devel-list
    
62. 
    

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1. 
   
2. On Thu, 2007-12-13 at 21:42 +0200, Pekka Savola wrote:
   
3. > I'm using gdm (default config), but /dev/dsp, /dev/audio and don't
   
4. > give me perms, I guess this is a problem:
   
5. >
   
6. > crw-rw----+ 1 root root 14, 3 2007-12-12 20:14 /dev/dsp
   
7. 
   
8. 1) /dev/dsp is for the deprecated OSS interface. The ALSA stuff lives
   
9. in /dev/snd/.
   
10. 
    
11. 2) the '+' indicates that there are ACLs on the file. Try:
    
12. $ getfacl /dev/dsp
    
13. and you should see something like this:
    
14. getfacl: Removing leading '/' from absolute path names
    
15. # file: dev/dsp
    
16. # owner: root
    
17. # group: root
    
18. user::rw-
    
19. user:gdm:rw-
    
20. user:wwoods:rw-
    
21. group::rw-
    
22. mask::rw-
    
23. other::---
    
24. 
    
25. Notice that my user (wwoods) has rw access, so that's OK.
    
26. 
    
27. > > 3) When GNOME/KDE/etc start up, they start pulseaudio.
    
28. > > - Actually, GNOME starts ESD, but /usr/bin/esd -> esdcompat
    
29. > > - esdcompat is provided by pulseaudio-esound-compat
    
30. > > - kde-settings-pulseaudio provides /etc/kde/env/pulseaudio.sh
    
31. >
    
32. > Right -- I''m using XFCE so I think I'm hosed.
    
33. 
    
34. Not really - you just have to start pulseaudio yourself, in one of the
    
35. various startup scripts.
    
36. 
    
37. > I guess  in the xfce rpms should start up something like this in their
    
38. > init scripts (but don't).
    
39. 
    
40. Yeah - same for fluxbox and other such windowmanagers.
    
41. 
    
42. > I wonder if there could have been some Conflicts: or other magic in
    
43. > the RPMs that would prevent making pulseaudio default if the user has
    
44. > a setup which is known not to work.
    
45. 
    
46. Fixing it in the packaging system seems like the wrong way to approach
    
47. it. It'd be best to fix the ALSA config so pulse is only the default
    
48. *when it's running*.
    
49. 
    
50. -w
    

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1. 
   
2. On Thu, 2007-12-13 at 14:24 -0600, Callum Lerwick wrote:
   
3. > > Richi Plana wrote:
   
4. > > How much extra latency are we getting from this ? I've noticed the extra
   
5. > > lag in some of our games.
   
6. >
   
7. > Probably because SDL is going through ESD? And OpenAL is going to go
   
8. > through SDL? Which is a completely bogus situation IMHO but it works for
   
9. > now.
   
10. 
    
11. Right. If I understand correctly, SDL choked when trying to use
    
12. PulseAudio as its ALSA device, so we used a last-minute workaround of
    
13. forcing it to use ESD. See this thread for details:
    
14. http://article.gmane.org/gmane.linux.redhat.fedora.devel/70224/
    
15. 
    
16. > Pulse's ALSA wrapper needs to be fixed to work with SDL and OpenAL
    
17. > and/or SDL and OpenAL need to get native Pulse support.
    
18. 
    
19. A preliminary driver was written in April:
    
20. http://www.nabble.com/PulseAudio-output-for-SDL-to10047401.html
    
21. I dunno what the status of that is now, but Lennart has said that we'll
    
22. get native support by F9. Let's hope.
    
23. 
    
24. -w
    

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