On Wed, Jul 10, 2002 at 10:22:33AM -0700, Joshua Haberman wrote:
> * Philipp Vollmer ([EMAIL PROTECTED]) wrote:
> > Hello list,
> >
> > I'm searching for a exact description of the PCM system.
> > The ALSA examples and HOWTO give a rough description of this system.
> > I actually only want to understand this system and want to create some
> > little application creating sine or other signals. There are some complex
> > signal generator examples online, but no simple description. Are there
> > books, really good examples or tutorials about this?
>
> It's a rough work-in-progress, but I have an overview of ALSA in the
> works:
>
> http://people.debian.org/~joshua/t1.html
>
hi,
as i said above, nice work, and nice that someone does this.
i tried yesterday your mmap implemantation and at least get it to work
somehow, but im right that:
outbuffer = (area->addr + (area->first + area->step * (offset)) / 8);
returns only a pointer to the buffer? i have to do:
memset(outbuffer, 0, frames_transmit);
memcpy(outbuffer, data, frames_transmit);
to really wright data to the buffer. i get also some kind of fragments
staying in buffer if i guess one 'frames_transmit' is smaller than the
written before or/and if its not aligned to fragment_size, a funny
effect, but im currently don't know how to clean it up.
--
regards
____-
joy
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