Regarding ALSA Library

Regarding ALSA Library

[Sundaranathan S]

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Hi  All,

        Can anyone explain me what is the purpose of snd_pcm_forward in
pcm.c. Also what is the use of __snd_pcm_forward macro and where is it
defined. I am not able to find any definition for this macro
__snd_pcm_forward.

        Can anyone clarify my doubts. Thanks and please forgive me if i
am misusing this list.

thanks,
-Sundaranathan
SIP Technologies & Exports Ltd

--
"Live as if to die tomorrow. Learn as if to live forever."



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Re: Regarding ALSA Library

[Jaroslav Kysela]

On Tue, 10 Jun 2003, Sundaranathan S wrote:

> Hi  All,
> 
>         Can anyone explain me what is the purpose of snd_pcm_forward in
> pcm.c.

The forward means exactly what you expect. You can go ahead in the ring
buffer without filling/reading of any samples. It means that affected
changes are not altered like write or mmap does for playback or you can
skip data for capture. It may be useful for realtime applications where
data might be ready in different times (network transfer etc.).

> Also what is the use of __snd_pcm_forward macro and where is it defined.
> I am not able to find any definition for this macro __snd_pcm_forward.

Look for INTERNAL() macro and read carefully the function declaration.

						Jaroslav

-----
Jaroslav Kysela <perex@suse.cz>
Linux Kernel Sound Maintainer
ALSA Project, SuSE Labs



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