Hi, Just wanted to give you some input from a user of the more advanced features of alsa volume controls. I am running an acoustic lab at the University of Western Australia. I have previously helped out in alsa to reverse engineer a sound card and fix some minor bugs. We use alsa/jack to do sound recordings and to implement realtime audio processing algorithms where the absolute relationship between the volume level and the voltage level at the sound card output must be known. Currently I have had to reverse engineer the A/D - D/A and driver to work out this relationship and write card specific functions to set the volume levels for the soundcard output. If you are making changes to the volume controls, the most valuable feature to the kind of work I am doing would be the ability to set the volume level in volts individually for each channel. Whatever you do please don't hide the actual analog gain settings behind software gain settings, it would make my work very difficult. Cheers, //Anders > On Mon, Oct 09, 2006 at 09:55:23AM -0400, Lee Revell wrote: > > On Mon, 2006-10-09 at 09:45 -0400, Daniel Jacobowitz wrote: > > > > alsactl save & restore should work for softvol. > > > > The softvol mixer element doesn't exist only at the very fresh state. > > > > > > I see, I just tried it and alsactl will create a user control just > > > fine. That's great. > > > > > > I will give the softvol solution a try, and post the patches if it > > > works. > > > > > > > Isn't it inefficient to force all audio to go through a software volume > > control just to have a master volume? Wouldn't it be better to make a > > ganged control in the driver (until the alsa-lib abstract mixer layer is > > ready)? > > I did consider doing it this way over the weekend. However, being able > to adjust the relative volumes of the different channels still seems > useful to me. If you have a single unified control, then you mess up > trying to move the others. > > What do you think? Should I just slave them all together and remove > the other volume controls? It's probably easier; it just seems somehow > lacking. ------------------------------------------------------------------------- Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT & business topics through brief surveys -- and earn cash http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV _______________________________________________ Alsa-devel mailing list Alsa-devel@xxxxxxxxxxxxxxxxxxxxx https://lists.sourceforge.net/lists/listinfo/alsa-devel
