volume PCM plugin

[Petr Gladkikh <batyi@mail.ru>]

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Hello.

Here is the patch (for alsa-lib-1.0.7) which is another attempt 
(compare to coftvol plugin) to emulate volume control in alsa-lib (see 
my previous post). The volume plugin is based on copy PCM plugin.

IMO the approach which is used here would allow more flexible 
configurations than softvol. E.g. it allows bind to master volume 
control in addition to emulated volume control. If necessary the 
volume plugin allows to easily extend number of hooks which can be 
attached to it (for now only one is supported).

Sample configuration
pcm.vol {
     type volume
     slave {
	pcm some_plug
     }
     coeff 1.0
     hook {
         card default
         control Master
         index 0
     }
}

Note that
	1. 'hook' is optional.
	2. volume plugin does not convert PCM formats thus it is best used 
with 'plug' PCM plugin for example.

/Petr.

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