pipeline: rpi: Avoid duplicating size range for the same pixel format

Some V4L2 formats translate to the same pixel format, e.g. YU12 and
YM12 both produce YUV420. In this case our ISP driver advertises the
same size range for both, but we must not record the same thing twice
for the same pixel format (which will cause a failure later on).

Instead, ignore the V4l2 format if the pixel format has already been
seen.

Signed-off-by: David Plowman <david.plowman@raspberrypi.com>
Reviewed-by: Naushir Patuck <naush@raspberrypi.com>
Reviewed-by: Jacopo Mondi <jacopo.mondi@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com>

src/libcamera/pipeline/rpi/common/pipeline_base.cpp

@@ -474,7 +474,11 @@ PipelineHandlerBase::generateConfiguration(Camera *camera, Span<const StreamRole
 			 */
 			for (const auto &format : fmts) {
 				PixelFormat pf = format.first.toPixelFormat();
-				if (pf.isValid()) {
+				/*
+				 * Some V4L2 formats translate to the same pixel format (e.g. YU12, YM12
+				 * both give YUV420). We must avoid duplicating the range in this case.
+				 */
+				if (pf.isValid() && deviceFormats.find(pf) == deviceFormats.end()) {
 					const SizeRange &ispSizes = format.second[0];
 					deviceFormats[pf].emplace_back(ispSizes.min, sensorSize,
 								       ispSizes.hStep, ispSizes.vStep);