[libcamera-devel] [PATCH 2/5] pipeline: raspberrypi: Set the ISP Output1 to 1/4 resolution if unused

[Naushir Patuck]

Hi David,

Thank you for your review feedback.

On Wed, 20 Jan 2021 at 09:53, David Plowman <david.plowman at raspberrypi.com>
wrote:

> Hi Naush
>
> Thanks for this patch. Just one small tidiness thing...
>
> On Wed, 20 Jan 2021 at 08:34, Naushir Patuck <naush at raspberrypi.com>
> wrote:
> >
> > In preparation for fast colour denoise, set the low resolution ISP
> > output stream (Output1) to a 1/4 resolution of the application requested
> > stream (Output0). This only happens if the application has not requested
> > an additional YUV or RGB stream.
> >
> > We also constrain this 1/4 resolution to at most 1200 pixels in the
> > largest dimension to avoid being too taxing on memory usage and system
> > bandwidth.
> >
> > Also switch the default StreamRole::VideoRecording to YUV420 to allow
> > fast colour denoise to run.
> >
> > Signed-off-by: Naushir Patuck <naush at raspberrypi.com>
> > ---
> >  .../pipeline/raspberrypi/raspberrypi.cpp      | 42 ++++++++++++++++++-
> >  1 file changed, 41 insertions(+), 1 deletion(-)
> >
> > diff --git a/src/libcamera/pipeline/raspberrypi/raspberrypi.cpp
> b/src/libcamera/pipeline/raspberrypi/raspberrypi.cpp
> > index e03bcb036f9f..282c4ba75d89 100644
> > --- a/src/libcamera/pipeline/raspberrypi/raspberrypi.cpp
> > +++ b/src/libcamera/pipeline/raspberrypi/raspberrypi.cpp
> > @@ -496,7 +496,7 @@ CameraConfiguration
> *PipelineHandlerRPi::generateConfiguration(Camera *camera,
> >
> >                 case StreamRole::VideoRecording:
> >                         fmts = data->isp_[Isp::Output0].dev()->formats();
> > -                       pixelFormat = formats::NV12;
> > +                       pixelFormat = formats::YUV420;
> >                         size = { 1920, 1080 };
> >                         bufferCount = 4;
> >                         outCount++;
> > @@ -608,6 +608,7 @@ int PipelineHandlerRPi::configure(Camera *camera,
> CameraConfiguration *config)
> >          * StreamConfiguration appropriately.
> >          */
> >         V4L2DeviceFormat format;
> > +       bool output1Set = false;
> >         for (unsigned i = 0; i < config->size(); i++) {
> >                 StreamConfiguration &cfg = config->at(i);
> >
> > @@ -632,6 +633,9 @@ int PipelineHandlerRPi::configure(Camera *camera,
> CameraConfiguration *config)
> >                 format.size = cfg.size;
> >                 format.fourcc = fourcc;
> >
> > +               LOG(RPI, Info) << "Setting " << stream->name() << " to a
> resolution of "
> > +                              << format.toString();
> > +
> >                 ret = stream->dev()->setFormat(&format);
> >                 if (ret)
> >                         return -EINVAL;
> > @@ -645,6 +649,42 @@ int PipelineHandlerRPi::configure(Camera *camera,
> CameraConfiguration *config)
> >
> >                 cfg.setStream(stream);
> >                 stream->setExternal(true);
> > +
> > +               if (i != maxIndex)
> > +                       output1Set = true;
> > +       }
> > +
> > +       /*
> > +        * If ISP::Output1 stream has not been requested by the
> application, we
> > +        * set it up for internal use now. This second stream will be
> used for
> > +        * fast colour denoise, and must be a quarter resolution of the
> ISP::Output0
> > +        * stream. However, also limit the maximum size to 1200 pixels
> in the
> > +        * larger dimension, just to avoid being wasteful with buffer
> allocations
> > +        * and memory bandwidth.
> > +        */
> > +       if (!output1Set) {
> > +               V4L2DeviceFormat output1Format = format;
> > +               constexpr unsigned int maxDimensions = 1200;
> > +
> > +               output1Format.size = format.size / 2;
> > +               if (output1Format.size.width > maxDimensions) {
> > +                       output1Format.size.height = maxDimensions *
> output1Format.size.height /
> > +
>  output1Format.size.width;
> > +                       output1Format.size.height &= ~1;
> > +                       output1Format.size.width = maxDimensions;
> > +               } else if (output1Format.size.height > maxDimensions) {
> > +                       output1Format.size.width = maxDimensions *
> output1Format.size.width /
> > +
> output1Format.size.height;
> > +                       output1Format.size.width &= ~1;
> > +                       output1Format.size.height = maxDimensions;
> > +               }
>
> I wonder if we can tidy this up with those new(ish) Size methods?
> Maybe along the lines of
>
> const Size maxSize = Size(maxDimensions ,
> maxDimensions).boundedToAspectRatio(format.size);
> output1Format.size = (format.size / 2).boundedTo(maxSize).alignedDownTo(2,
> 2);
>

Ooh, that is much nicer!  Have to admit, I didn't much explore the Size
class to see if this could be done.
I will make the suggested change on the next revision.

Regards,
Naush



>
> Thanks!
> David
>
> > +
> > +               LOG(RPI, Info) << "Setting ISP Output 1 (internal) to a
> resolution of "
> > +                              << output1Format.toString();
> > +
> > +               ret =
> data->isp_[Isp::Output1].dev()->setFormat(&output1Format);
> > +               if (ret)
> > +                       return -EINVAL;
> >         }
> >
> >         /* ISP statistics output format. */
> > --
> > 2.25.1
> >
> > _______________________________________________
> > libcamera-devel mailing list
> > libcamera-devel at lists.libcamera.org
> > https://lists.libcamera.org/listinfo/libcamera-devel
>
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