>snd_pcm_new() has two parameters for the number of substreams
>for playback and capture. 

its a language problem. its not the number of substreams as in "the
quantity of substreams". rather, it means "the ID of the substream".

>                          Yes, but what does it mean ? If I
>have N playback substreams, can I service N applications that
>use one stream ? Can channels be allocated on demand, to allow
>the user to use 4 xmms or 1 xmms and a dvd player (5.1) at the
>same time ? :))

this depends on (1) whether the underlying hardware supports it and
(2) whether you use a "dmix" PCM device rather than a "hw" PCM
device. the "hw" PCM device only offers the capabilities of the
hardware, nothing more.



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