[RFC PATCH 0/1] Enable raw streams with software ISP

[Laurent Pinchart]

On Fri, Nov 22, 2024 at 09:13:03PM +0100, Milan Zamazal wrote:
> This makes raw streams working again in ‘simple’ pipeline when software
> ISP is enabled for the given device.  For now, only a single raw stream
> is supported and there are no immediate plans to change that unless
> there is a request for more.

Cameras don't support multiple raw streams in general. By "only a single
raw stream is supported", do you mean you can't capture raw + processed
? I think that should be fixed, otherwise this sounds too much of a
hack.

> An example ‘cam’ invocation requesting a raw stream rather than a debayered stream:
> 
>   cam -c1 -C8 -s role=raw,width=1920,height=1080 -Ffile#.raw
> 
> See the commit message for more information about the patch.
> 
> The patch is RFC because I’m not sure where it is placed on the scale
> between a hack/PoC and a proper solution and because it’s not that
> useful until a control for exposure/gain adjustments is implemented.
> 
> In the meantime, fixed exposure+gain can be hardwired in
> src/ipa/simple/soft_simple.cpp by changing the lines
> 
>   ctrls.set(V4L2_CID_EXPOSURE, …);
>   ctrls.set(V4L2_CID_ANALOGUE_GAIN, …);
> 
> to set the desired values (values used under the given conditions can be
> obtained from normal software ISP debayered output debug log).
> 
> Milan Zamazal (1):
>   libcamera: simple: Fix raw output
> 
>  src/libcamera/pipeline/simple/simple.cpp | 66 +++++++++++++++++++-----
>  1 file changed, 54 insertions(+), 12 deletions(-)

-- 
Regards,

Laurent Pinchart