Dominique Larchey-Wendling wrote:
> > It appears this behaviour is by design.
>
> Ok so this is not a bug but a feature ;-)
> However, it is not specified in the doc that alsa-lib makes a semantic
> distinction between the types of objects
If a somewhat complete documentation existed, it would certainly mention
this.
> in the alisp language.
The configuration language is not alisp.
> What is strange is that the same function is called in alsa-lib to
> expand hw:0 whether it is prefixed with "ctl" or "pcm" :
>
> snd_config_search_definition(root, "ctl", name, &ctl_conf);
>
> and
>
> snd_config_search_definition(root, "pcm", name, &pcm_conf);
This function is called with a string like "tata" and returns the string
"hw:0" (it would return the compound node {type hw card 0} when it would
be called with "hw:0").
In the PCM code, it is the following recursive call of
snd_pcm_open_noupdate() that causes the extra lookup to happen.
> but my question was more why is it designed this way ?
Well, "designed" may be too strong a word; it implies that somebody
actually thought about it. :-)
I'd guess that this functionality was never needed for any device type
except PCM because there aren't any plugins that could be used in place
of "hw".
Regards,
Clemens
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