Messages in this thread | | | Subject | Re: How can I link the kernel with libgcc ? | From | Lee Revell <> | Date | Thu, 09 Mar 2006 22:22:41 -0500 |
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(added alsa-devel to cc:)
On Thu, 2006-03-09 at 19:01 -0800, Carlos Munoz wrote: > >Audio drivers should never have to directly manipulate the samples - > >they just manage the DMA buffers and interrupts and wake up the process > >at the right time. Mixing, routing, volume control, DSP go in > >userspace. > > Unfortunately, the driver needs to populate several coefficient tables > for the hardware to perform silence suppression and other advance > features. The values for these tables are calculated using log10 > operations. I don't see a clean way to push these operations to user > space without the need for custom applications that build the tables and > pass them to the driver.
Unless you can do it with fixed point math, or use a static table, you might have to do just that, with a sysfs interface. For example the emu10k1 driver uses an ioctl interface to upload code to the built in (floating point) DSP. But new ioctls are frowned upon...
Lee
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