Sound reasoning

[Евгений Б. Спамаковский]

On Sun, Feb 8, 2015 at 10:29 PM, Hans Petter Selasky <hps at selasky.org>
wrote:

> On 02/08/15 22:22, Евгений Б. Спамаковский wrote:
>
>> Hi.
>>
>> Is there a point to writing a pcm device to have multiple "channel"s in
>> the
>> same direction?
>> Say, two SND_FORMAT(AFMT_S16_LE, 1, 0) for record and two for playback,
>> vs.
>> just one SND_FORMAT(AFMT_S16_LE, 2, 0) in each direction.
>>
>> pcm_register() has so prominently two arguments 'numrec' and 'numplay' and
>> even if they are ignored, one can do pcm_addchan() any number of times.
>> How is this expressed to the user-land programmer?
>>
>> "Read the code" is a fine answer, but it would be nice if someone can
>> readily explain the idea behind the options.
>>
>
> Hi,
>
>

> Sounds similar to what my "virtual_oss" is doing. See:
>
> svn --username anonsvn --password anonsvn \
>       checkout svn://svn.turbocat.net/i4b/trunk/ports


>From the description it looks like virtual_oss is trying to do what VCHANs
already succeed at doing.
No offense, but this still does not explain what the difference is between
a pcm unit collecting its physical streams in one channel vs. having a
channel for each...

Let's say I'm five years old?


>
> --HPS
>