Re: User land drivers.

[James Courtier-Dutton <James@superbug.demon.co.uk>]

Jaroslav Kysela wrote:
> On Fri, 3 Sep 2004, Takashi Iwai wrote:
> 
> 
>>Also, we may provide a more easy-to-use interface for additional ALSA
>>pcm plugins.  The current design of plugin is bound too tightly to the
>>ALSA lowlevel structure, and it's a pain to implement all on that at
>>each time.
> 
> 
> I think that we should follow the kernel space here - create only helper 
> functions which might be used in the user space driver design.
> 
> 						Jaroslav
> 

Currently, to support a new sound card in ALSA, we just write a small 
bit of code to talk to the hardware, and other alsa kernel modules 
provide all the helper functions(period_elapsed etc.), so for a user 
land driver(bluetooth), these helper functions should be in alsa-lib.

You mention the PCM plugin. I did not know there was already a PCM 
plugin api that could be used to talk to some other user land program. I 
just thought the PCM plugins were for sample rate conversion and simple 
stuff like that.

I might have to look at the docs again.

James


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