[linux-audio-user] FC5 and Flash Audio

[Thomas Ilnseher]

Brad Fuller wrote:
> Thomas Ilnseher wrote:
>   
>> Brad Fuller wrote:
>>     
>>> Bert Visser wrote:
>>>  
>>>       
>>>>> I've upgraded to FC5, and I'm slowly inching my way up to get audio
>>>>> working (PlanetCCRMA). I have a particular problem in that Flash video
>>>>> works fine, but I have no audio (occurs in Firefox, Opera and
>>>>> Konqueror.) I've searched for a solution and really haven't found
>>>>> anything that works. Some reports have said that a chmod to
>>>>> /dev/dsp of
>>>>> 0666 will help. Others say that changing the permissions on the
>>>>> "plugins" directory will do the trick. Nope, not for me.
>>>>>
>>>>> I noticed that I had no /dev/dsp. So, I kinda figured that maybe the
>>>>> Flash plugin hard defaults to writing to /dev/dsp. So I made one with
>>>>> ./MAKEDEV audio... and sure enough, a dsp1 was made. However, I still
>>>>> have no audio when playing flash in a browser.
>>>>>       
>>>>>           
>> /dev/dsp* are oss audio devices.
>>
>> oss drivers are marked as depreciated in the kernel, and are replaced
>> with alsa drivers.
>>
>> thus i am sure, FC5 will use ALSA instead of oss.
>>
>> there are oss compatibility modules for alsa, they are named:
>> snd_pcm_oss
>> snd_mixer_oss
>> snd_seq_oss
>>     
> as I mentioned, these do exist. So it's looking more and more like a
> udev problem.
>
>   
ok, /dev/dsp1 does exist and is usable (the modules are loaded)

you could try to make a symlink from /dev/dsp1 to /dev/dsp
ln -s /dev/dps1 /dev/dsp
and see if things work.

i noticed that for my installation (which is gentoo!), legacy oss 
devices are created in
/dev/sound/ .

maybe that is true for FC5 also.

on my sys there are symlinks created from /dev/dsp to /dev/sound/dsp and 
so on.

the udev rules look like this:

# sound devices
KERNEL=="adsp",                 NAME="sound/%k", SYMLINK+="%k", 
GROUP="audio"
KERNEL=="adsp[0-9]*",           NAME="sound/%k", SYMLINK+="%k", 
GROUP="audio"
KERNEL=="audio",                NAME="sound/%k", SYMLINK+="%k", 
GROUP="audio"
KERNEL=="audio[0-9]*",          NAME="sound/%k", SYMLINK+="%k", 
GROUP="audio"
KERNEL=="dsp",                  NAME="sound/%k", SYMLINK+="%k", 
GROUP="audio"
KERNEL=="dsp[0-9]*",            NAME="sound/%k", SYMLINK+="%k", 
GROUP="audio"
KERNEL=="mixer",                NAME="sound/%k", SYMLINK+="%k", 
GROUP="audio"
KERNEL=="mixer[0-9]*",          NAME="sound/%k", SYMLINK+="%k", 
GROUP="audio"
KERNEL=="sequencer",            NAME="sound/%k", SYMLINK+="%k", 
GROUP="audio"
KERNEL=="sequencer[0-9]*",      NAME="sound/%k", SYMLINK+="%k", 
GROUP="audio"

they are located under /etc/udev/rules.d/50-udev.rules (here in gentoo).


>> do 'lsmod | grep oss' and see if these modules are loaded.
>> if yes, there is something foobared with your udev setup -
>> if no (thats what i expect) load these modules:
>>
>> modprobe snd_pcm_oss
>> modprobe snd_mixer_oss
>> modprobe snd_seq_oss
>>
>> note, for sound playback (flash), only the first module is required.
>>
>> once you load the snd_pcm_oss module, udev should create /dev/dsp* as
>> required automatically.
>>
>> if sound playback still doesn't work, this might be because your
>> soundcard has no built in mixing capabilities,
>> and some other application is using your audio device.
>> 'other application' might include arts, which is started together with
>> KDE check with 'ps aux  | grep artsd' and kill with 'killall artsd'.
>> the later command will disable sound in all kde apps.
>>     
> nope, don't have artsd running. I only use alsa.
>
>   
>> if you are running KDE (and arts), you might also try running firefox as
>> 'artsdsp firefox' from the konsole. this doesn't need the
>> aforementioned kernel modules.
>>     
> I've also tried 'aoss firefox' but that didn't work either.
>
> Thanks for the detailed and clear msg!
>
> brad
>
>
>