Matt Flax wrote:
Recently I was advised to channel multichannel audio over stereo I2S
Why would you want to do that? Don't you have the appropriate number of I²S lines?
and unpack in user space with plugins.
Why?
Right now, with a hacked machine driver, I get DMA unpacking to multichannel for free.
If I switch to user space ALSA plugin unpacking, as advised, can anyone answer the following questions please :
If I want to handle all word sizes which are currently implemented S16 -> S32, do I need to use different plugins to handle different word sizes ?
Plugins can query what the actual sample format is (and can constrain them to what they support).
Regarding the actual channel unpacking, will it cost a lot more to do this in user space, rather then using the DMA silicon ?
Of course.
Regards, Clemens