James Courtier-Dutton wrote: > I believe it could be extended to support a continuous range. > For example, some hardware uses a 32bit value to control the gain. > The mix operation is simply "the_sample" * "the_control_value". > So in this case the hardware has a linear control that can be > considered continuous for our purposes. Such controls already exist: $ grep -rl DB_LINEAR sound/ sound/i2c/other/ak4xxx-adda.c sound/pci/oxygen/hifier.c sound/pci/oxygen/oxygen.c sound/pci/ymfpci/ymfpci_main.c sound/soc/codecs/stac9766.c sound/soc/codecs/wm8350.c sound/soc/codecs/wm8400.c sound/soc/codecs/wm8990.c > The conversion from the control value to a usable value would have to > include a user land log operation. > It was never implemented due to lack of demand. It is implemented. > For the cards that do have this 32bit linear value, a simple lookup > table is used in the kernel code to convert it to 256 step values. Which driver is this? It should be changed to use the full range. Regards, Clemens _______________________________________________ Alsa-devel mailing list Alsa-devel@xxxxxxxxxxxxxxxx http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
