Hi, Thanks. A quick follow up question. In the trigger function - I see that from substream->runtime->private_data, voice specific parameters are extracted. How and can somehow user space fill in some private data to the driver so that driver can process voice in a different way and music in a different way? Thanks, Harsha -----Original Message----- From: rlrevell@xxxxxxxxx [mailto:rlrevell@xxxxxxxxx] On Behalf Of Lee Revell Sent: Saturday, December 06, 2008 10:29 AM To: Harsha, Priya Cc: alsa-devel@xxxxxxxxxxxxxxxx Subject: Re: question on hardware mixing On Fri, Dec 5, 2008 at 12:03 PM, Harsha, Priya <priya.harsha@xxxxxxxxx> wrote: > Hi, > > If my sound card supports hardware mixing, how do I need to code my sound card driver such that I can send multiple streams through ALSA to the sound card driver at the same time? > Check out the emu10k1 driver. You need something like the voice allocator in that driver that assigns a hardware mixing channel or channels when ALSA asks the driver for a new PCM stream. User space would open the same device multiple times (up to the hardware voice limit) and the driver manages the allocations. From userspace POV a hardware mixing device looks just like a single stream device, but it doesn't return -EBUSY when you open it multiple times. Lee _______________________________________________ Alsa-devel mailing list Alsa-devel@xxxxxxxxxxxxxxxx http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
