[libcamera-devel] [PATCH v5 08/19] libcamera: ipu3: Cache the camera sizes

[Jacopo Mondi]

Hi Laurent,

On Tue, Apr 02, 2019 at 10:27:17AM +0300, Laurent Pinchart wrote:
> Hi Jacopo,
>
> Thank you for the patch.
>
> On Tue, Mar 26, 2019 at 09:38:51AM +0100, Jacopo Mondi wrote:
> > When creating a camera, make sure a the image sensor provides images in
> > a format compatible with IPU3 CIO2 unit requirements and cache the
> > minimum and maximum camera sizes.
> >
> > Signed-off-by: Jacopo Mondi <jacopo at jmondi.org>
> > ---
> >  src/libcamera/pipeline/ipu3/ipu3.cpp | 56 +++++++++++++++++++++++++++-
> >  1 file changed, 54 insertions(+), 2 deletions(-)
> >
> > diff --git a/src/libcamera/pipeline/ipu3/ipu3.cpp b/src/libcamera/pipeline/ipu3/ipu3.cpp
> > index 55489c31df2d..d42c81273cc6 100644
> > --- a/src/libcamera/pipeline/ipu3/ipu3.cpp
> > +++ b/src/libcamera/pipeline/ipu3/ipu3.cpp
> > @@ -8,11 +8,14 @@
> >  #include <memory>
> >  #include <vector>
> >
> > +#include <linux/media-bus-format.h>
> > +
> >  #include <libcamera/camera.h>
> >  #include <libcamera/request.h>
> >  #include <libcamera/stream.h>
> >
> >  #include "device_enumerator.h"
> > +#include "geometry.h"
> >  #include "log.h"
> >  #include "media_device.h"
> >  #include "pipeline_handler.h"
> > @@ -24,6 +27,22 @@ namespace libcamera {
> >
> >  LOG_DEFINE_CATEGORY(IPU3)
> >
> > +static int mediaBusToCIO2Format(unsigned int code)
> > +{
> > +	switch (code) {
> > +	case MEDIA_BUS_FMT_SBGGR10_1X10:
> > +		return V4L2_PIX_FMT_IPU3_SBGGR10;
> > +	case MEDIA_BUS_FMT_SGBRG10_1X10:
> > +		return V4L2_PIX_FMT_IPU3_SGBRG10;
> > +	case MEDIA_BUS_FMT_SGRBG10_1X10:
> > +		return V4L2_PIX_FMT_IPU3_SGRBG10;
> > +	case MEDIA_BUS_FMT_SRGGB10_1X10:
> > +		return V4L2_PIX_FMT_IPU3_SRGGB10;
> > +	default:
> > +		return -EINVAL;
> > +	}
> > +}
> > +
> >  class PipelineHandlerIPU3 : public PipelineHandler
> >  {
> >  public:
> > @@ -70,6 +89,9 @@ private:
> >  		V4L2Subdevice *sensor_;
> >
> >  		Stream stream_;
> > +
> > +		/* Maximum sizes and the mbus code used to produce them. */
> > +		std::pair<unsigned int, SizeRange> maxSizes_;
>
> The use of std::pair here makes the code below use .first and .second,
> which are not very readable. I think it would be better to store the
> pixel format and max size in two separate fields, of unsigned int and
> SizeRange types respectively. Or, now that I think about it, as you only
> care about the maximum size, maybe adding a Size structure to geometry.h
> would be a good idea.
>

I see... I'll ponder about it. Adding new stuff it's always a burden
because of documentation and such, but I get your point...

> >  	};
> >
> >  	IPU3CameraData *cameraData(const Camera *camera)
> > @@ -404,18 +426,48 @@ void PipelineHandlerIPU3::registerCameras()
> >  		if (ret)
> >  			continue;
> >
> > -		data->cio2_->bufferReady.connect(data.get(), &IPU3CameraData::bufferReady);
> > -
> > +		/*
> > +		 * Make sure the sensor produces at least one image format
> > +		 * compatible with IPU3 CIO2 requirements and cache the camera
> > +		 * maximum sizes.
> > +		 */
> >  		data->sensor_ = new V4L2Subdevice(sensor);
> >  		ret = data->sensor_->open();
> >  		if (ret)
> >  			continue;
> >
> > +		for (auto it : data->sensor_->formats(0)) {
> > +			int mbusCode = mediaBusToCIO2Format(it.first);
> > +			if (mbusCode < 0)
> > +				continue;
> > +
> > +			for (const SizeRange &size : it.second) {
> > +				SizeRange &maxSize = data->maxSizes_.second;
> > +
> > +				if (maxSize.maxWidth < size.maxWidth &&
> > +				    maxSize.maxHeight < size.maxHeight) {
> > +					maxSize.maxWidth = size.maxWidth;
> > +					maxSize.maxHeight = size.maxHeight;
> > +					data->maxSizes_.first = mbusCode;
> > +				}
> > +			}
> > +		}
>
> One blank line ?

Not sure, as this is an error condition, I like it better without an
empty line.

>
> > +		if (data->maxSizes_.second.maxWidth == 0) {
> > +			LOG(IPU3, Info)
> > +				<< "Sensor '" << data->sensor_->entityName()
> > +				<< "' detected, but no supported image format "
> > +				<< " found: skip camera creation";
> > +			continue;
> > +		}
> > +
> >  		data->csi2_ = new V4L2Subdevice(csi2);
> >  		ret = data->csi2_->open();
> >  		if (ret)
> >  			continue;
> >
> > +		data->cio2_->bufferReady.connect(data.get(),
> > +						 &IPU3CameraData::bufferReady);
> > +
>
> This seems unrelated to this patch, is it needed ?

please see:
 > > -           data->cio2_->bufferReady.connect(data.get(), &IPU3CameraData::bufferReady);

A few lines above here.

Thanks
  j

>
> >  		registerCamera(std::move(camera), std::move(data));
> >
> >  		LOG(IPU3, Info)
>
> --
> Regards,
>
> Laurent Pinchart
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