Clemens Ladisch schrieb: > olig9@xxxxxx wrote: > >>1.) Is it really possible to get inside a plugin the PCM & Master volume >>settings that are set eg. with alsamixer? >>2.) Would it be better to do all this in a new plugin, > > > Yes. Yes. > > In ALSA, everything is a plugin. This is obvious with pcm plugins > like dmix, but "hw" is a plugin, too (that just happens to access the > hardware driver). > > For mixer controls and related stuff, there are ctl plugins. The only > one so far is the "hw" plugin, which provides access to those controls > implemented by the hardware driver. > > A volume scaling plugin would consist of a pcm plugin that would scale > its input data before handing it off to a slave plugin, and of a > related ctl plugin that would provide a virtual volume control and > hand off requests for all other controls to a slave plugin. > > > Regards, > Clemens > > > Thanks for your help so far. I wonder that nobody has written such a plugin yet... Anyway, do you know if there's some documentation about writing an ALSA plugin (apart from the existing sources)? Or is there a "simple plugin" which just passes data along without changing anything (maybe pcm_plugin.c is something like that)? That would be a good base for this. Oh, and are there examples for the ctl plugins? Oliver
