[libcamera-devel] [PATCH] libcamera: camera_sensor: Use active area size as resolution

[Laurent Pinchart]

Hi Jacopo,

On Mon, Feb 08, 2021 at 09:51:52AM +0100, Jacopo Mondi wrote:
> On Mon, Feb 08, 2021 at 03:38:05AM +0200, Laurent Pinchart wrote:
> > When a sensor can upscale the image, the native sensor resolution isn't
> > equal to the largest size reported by the sensor. Use the active area
> 
> Not sure I got this one. If the sensor can upscale, wouldn't the
> largest produced size be enumerated through the canonical
> ENUM_FRAME_SIZE ioctl from which we build the sizes_ vector anyway ?

It would, that's the issue :-) ENUM_FRAME_SIZE would report the largest
size the scaler can produce, which would be larger than the sensor's
native resolution.

> > size instead, and default it to the largest enumerated size if the crop
> > rectangle targets are not supported.
> >
> > Signed-off-by: Laurent Pinchart <laurent.pinchart at ideasonboard.com>
> > ---
> >  include/libcamera/internal/camera_sensor.h |  3 +--
> >  src/libcamera/camera_sensor.cpp            | 16 ++++++++--------
> >  2 files changed, 9 insertions(+), 10 deletions(-)
> >
> > diff --git a/include/libcamera/internal/camera_sensor.h b/include/libcamera/internal/camera_sensor.h
> > index c8f81882a958..74c35d1c8922 100644
> > --- a/include/libcamera/internal/camera_sensor.h
> > +++ b/include/libcamera/internal/camera_sensor.h
> > @@ -55,7 +55,7 @@ public:
> >  	const MediaEntity *entity() const { return entity_; }
> >  	const std::vector<unsigned int> &mbusCodes() const { return mbusCodes_; }
> >  	const std::vector<Size> &sizes() const { return sizes_; }
> > -	const Size &resolution() const { return resolution_; }
> > +	Size resolution() const { return activeArea_.size(); }
> >
> >  	V4L2SubdeviceFormat getFormat(const std::vector<unsigned int> &mbusCodes,
> >  				      const Size &size) const;
> > @@ -87,7 +87,6 @@ private:
> >  	std::string id_;
> >
> >  	V4L2Subdevice::Formats formats_;
> > -	Size resolution_;
> >  	std::vector<unsigned int> mbusCodes_;
> >  	std::vector<Size> sizes_;
> >
> > diff --git a/src/libcamera/camera_sensor.cpp b/src/libcamera/camera_sensor.cpp
> > index c9e8d49b7935..59834ffcdd94 100644
> > --- a/src/libcamera/camera_sensor.cpp
> > +++ b/src/libcamera/camera_sensor.cpp
> > @@ -234,10 +234,12 @@ int CameraSensor::init()
> >  	sizes_.erase(last, sizes_.end());
> >
> >  	/*
> > -	 * The sizes_ vector is sorted in ascending order, the resolution is
> > -	 * thus the last element of the vector.
> > +	 * Initialize the pixel array size as the largest size supported by the
> > +	 * sensor. It will be overridden later using the crop bounds. The
> > +	 * sizes_ vector is sorted in ascending order, the largest size is thus
> > +	 * the last element of the vector.
> >  	 */
> > -	resolution_ = sizes_.back();
> > +	pixelArraySize_ = sizes_.back();
> >
> >  	/*
> >  	 * VIMC is a bit special, as it does not yet support all the mandatory
> > @@ -307,14 +309,13 @@ int CameraSensor::validateSensorDriver()
> >  	Rectangle rect;
> >  	int ret = subdev_->getSelection(pad_, V4L2_SEL_TGT_CROP_BOUNDS, &rect);
> >  	if (ret) {
> > -		rect = Rectangle(resolution());
> >  		LOG(CameraSensor, Warning)
> >  			<< "The PixelArraySize property has been defaulted to "
> > -			<< rect.toString();
> > +			<< pixelArraySize_.toString();
> >  		err = -EINVAL;
> > +	} else {
> > +		pixelArraySize_ = rect.size();
> >  	}
> > -	pixelArraySize_.width = rect.width;
> > -	pixelArraySize_.height = rect.height;
> >
> >  	ret = subdev_->getSelection(pad_, V4L2_SEL_TGT_CROP_DEFAULT, &activeArea_);
> >  	if (ret) {
> > @@ -380,7 +381,6 @@ int CameraSensor::validateSensorDriver()
> >   */
> >  void CameraSensor::initVimcDefaultProperties()
> >  {
> > -	pixelArraySize_ = resolution();
> >  	activeArea_ = Rectangle(pixelArraySize_);
> >  }
> >

-- 
Regards,

Laurent Pinchart