[libcamera-devel] [PATCH] pipeline: rpi: Move flip handling validation code

[Naushir Patuck]

Hi Jacopo,

On Tue, 17 Oct 2023 at 12:54, Jacopo Mondi
<jacopo.mondi at ideasonboard.com> wrote:
>
> Hi Naush
>
> On Fri, Oct 13, 2023 at 10:10:03AM +0100, Naushir Patuck via libcamera-devel wrote:
> > Move the handling of Bayer order changes due to flips to run before
> > platformValidate(). This removes the need for this code to be split
> > between platformValidate() and validate() as it is right now.
> >
> > Also add some validation to ensure the vc4 pipeline handler only
> > supports CSI2 packing or no packing.
> >
> > Signed-off-by: Naushir Patuck <naush at raspberrypi.com>
> > Reviewed-by: David Plowman <david.plowman at raspberrypi.com>
> > ---
> >  .../pipeline/rpi/common/pipeline_base.cpp     | 43 +++++++++++++------
> >  src/libcamera/pipeline/rpi/vc4/vc4.cpp        | 15 ++++---
> >  2 files changed, 38 insertions(+), 20 deletions(-)
> >
> > diff --git a/src/libcamera/pipeline/rpi/common/pipeline_base.cpp b/src/libcamera/pipeline/rpi/common/pipeline_base.cpp
> > index 825eae80d014..7c88b87e0608 100644
> > --- a/src/libcamera/pipeline/rpi/common/pipeline_base.cpp
> > +++ b/src/libcamera/pipeline/rpi/common/pipeline_base.cpp
> > @@ -231,16 +231,12 @@ CameraConfiguration::Status RPiCameraConfiguration::validate()
> >               }
> >       }
> >
> > -     /* Do any platform specific fixups. */
> > -     status = data_->platformValidate(this);
> > -     if (status == Invalid)
> > -             return Invalid;
> > -
> > -     /* Further fixups on the RAW streams. */
> > +     /* Start with some initial generic RAW stream adjustments. */
> >       for (auto &raw : rawStreams_) {
> > -             int ret = raw.dev->tryFormat(&raw.format);
> > -             if (ret)
> > -                     return Invalid;
> > +             StreamConfiguration *rawStream = raw.cfg;
> > +
> > +             /* Adjust the RAW stream to match the computed sensor format. */
> > +             BayerFormat sensorBayer = BayerFormat::fromMbusCode(sensorFormat_.mbus_code);
> >
> >               /*
> >                * Some sensors change their Bayer order when they are h-flipped
> > @@ -249,12 +245,33 @@ CameraConfiguration::Status RPiCameraConfiguration::validate()
> >                * Note how we must fetch the "native" (i.e. untransformed) Bayer
> >                * order, because the sensor may currently be flipped!
> >                */
> > -             BayerFormat bayer = BayerFormat::fromPixelFormat(raw.cfg->pixelFormat);
> >               if (data_->flipsAlterBayerOrder_) {
> > -                     bayer.order = data_->nativeBayerOrder_;
> > -                     bayer = bayer.transform(combinedTransform_);
> > +                     sensorBayer.order = data_->nativeBayerOrder_;
> > +                     sensorBayer = sensorBayer.transform(combinedTransform_);
> > +             }
> > +
> > +             /* Apply the sensor adjusted Bayer order to the user request. */
> > +             BayerFormat cfgBayer = BayerFormat::fromPixelFormat(rawStream->pixelFormat);
> > +             cfgBayer.order = sensorBayer.order;
> > +
> > +             if (rawStream->pixelFormat != cfgBayer.toPixelFormat()) {
> > +                     rawStream->pixelFormat = cfgBayer.toPixelFormat();
> > +                     status = Adjusted;
> >               }
> > -             raw.cfg->pixelFormat = bayer.toPixelFormat();
> > +     }
> > +
> > +     /* Do any platform specific fixups. */
> > +     Status st = data_->platformValidate(this);
> > +     if (st == Invalid)
> > +             return Invalid;
> > +     else if (st == Adjusted)
> > +             status = Adjusted;
> > +
> > +     /* Further fixups on the RAW streams. */
> > +     for (auto &raw : rawStreams_) {
> > +             int ret = raw.dev->tryFormat(&raw.format);
> > +             if (ret)
> > +                     return Invalid;
> >
> >               if (RPi::PipelineHandlerBase::updateStreamConfig(raw.cfg, raw.format))
> >                       status = Adjusted;
> > diff --git a/src/libcamera/pipeline/rpi/vc4/vc4.cpp b/src/libcamera/pipeline/rpi/vc4/vc4.cpp
> > index 233473e2fe2b..425ab9ae6ea5 100644
> > --- a/src/libcamera/pipeline/rpi/vc4/vc4.cpp
> > +++ b/src/libcamera/pipeline/rpi/vc4/vc4.cpp
> > @@ -409,16 +409,17 @@ CameraConfiguration::Status Vc4CameraData::platformValidate(RPi::RPiCameraConfig
> >
> >               /* Adjust the RAW stream to match the computed sensor format. */
> >               StreamConfiguration *rawStream = rawStreams[0].cfg;
> > -             BayerFormat rawBayer = BayerFormat::fromMbusCode(rpiConfig->sensorFormat_.mbus_code);
> > +             BayerFormat rawBayer = BayerFormat::fromPixelFormat(rawStream->pixelFormat);
> >
> > -             /* Handle flips to make sure to match the RAW stream format. */
> > -             if (flipsAlterBayerOrder_)
> > -                     rawBayer = rawBayer.transform(rpiConfig->combinedTransform_);
> > +             /* Apply the sensor bitdepth. */
> > +             rawBayer.bitDepth = BayerFormat::fromMbusCode(rpiConfig->sensorFormat_.mbus_code).bitDepth;
> >
> > -             /* Apply the user requested packing. */
> > -             rawBayer.packing = BayerFormat::fromPixelFormat(rawStream->pixelFormat).packing;
> > -             PixelFormat rawFormat = rawBayer.toPixelFormat();
> > +             /* Default to CSI2 packing if the user request is unsupported. */
> > +             if (rawBayer.packing != BayerFormat::Packing::CSI2 &&
> > +                 rawBayer.packing != BayerFormat::Packing::None)
> > +                     rawBayer.packing = BayerFormat::Packing::CSI2;
>
> Do you need to return Adjusted in this case ?

Yes we do, that (I think!) is handled in the if() clause below where
we convert from Bayer back to PixelFormat and do the comparison with
the config PixelFormat.

Regards,
Naush


>
> Thanks
>   j
>
> >
> > +             PixelFormat rawFormat = rawBayer.toPixelFormat();
> >               if (rawStream->pixelFormat != rawFormat ||
> >                   rawStream->size != rpiConfig->sensorFormat_.size) {
> >                       rawStream->pixelFormat = rawFormat;
> > --
> > 2.34.1
> >