On 8/30/17 2:31 PM, Lambdadroid wrote:
On Wed, Aug 30, 2017 at 9:20 PM, Pierre-Louis Bossart
<pierre-louis.bossart@xxxxxxxxxxxxxxx> wrote:
The firmware available upstream does not contain MP3/AAC or proprietary
libraries due to redistribution rights. Some of patents may start to expire
soon but in general we steer clear of such components for freely available
binary firmware. Not my choice btw, this is a minefield that's all too
common for all open-source projects.
The benefits of mp3 offload on Baytrail are quite limited anyway due to
internal SoC design choices, I wouldn't recommend you pursue this work if
power optimization was the goal. Offload was mostly used for Medfield,
Clovertrail, Merrifield and Anniedale platforms.
Alright, thanks a lot for letting me know! I was mostly just curious
if it works when I saw that it's (theoretically) supported on
bytcr-rt5640. Is there any way to check if the firmware supports it
from the kernel side? It would be helpful if either the compressed
ALSA device wasn't even available or if there was at least a readable
error when attempting to use it. It's quite confusing when it appears
to be supported but it isn't working and other people might run into
this issue as well.
Agree, I just don't think the kernel can know what the contents of the
firmware is, it's mostly opaque.
For more recent firmware based on the topology this sort of problems
should go away, the streams exposed to userpace are not hard-coded in
the kernel and if one tried to enable/configure a component that's not
part for the firmware you would get an error.
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