libcamera: rkisp1: Assign sizes to roles

Currently each RkISP1 path (main and self) generate a configuration
by bounding the sensor's resolution to their respective maximum output
aspect ratio and size.

	Size maxResolution = maxResolution_.boundedToAspectRatio(resolution)
					   .boundedTo(resolution);

In the case of self path, whose maximum size is 1920x1920, the generated
configuration could get assigned unusual sizes, as the result of the
above operation.

As an example, with the imx258 sensor whose resolution is 4208x3118, the
resulting size for the Viewfinder use case is an unusual 1920x1423.

Fix this by assigning to each role a desired output size:
- Use the sensor's resolution for StillCapture and Raw
- Use 1080p for Viewfinder and VideoRecording

Signed-off-by: Jacopo Mondi <jacopo.mondi@ideasonboard.com>
Reviewed-by: Paul Elder <paul.elder@ideasonboard.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Reviewed-by: Umang Jain <umang.jain@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

src/libcamera/pipeline/rkisp1/rkisp1.cpp

@@ -162,6 +162,8 @@ public:
 	bool match(DeviceEnumerator *enumerator) override;
 
 private:
+	static constexpr Size kRkISP1PreviewSize = { 1920, 1080 };
+
 	RkISP1CameraData *cameraData(Camera *camera)
 	{
 		return static_cast<RkISP1CameraData *>(camera->_d());
@@ -633,12 +635,15 @@ PipelineHandlerRkISP1::generateConfiguration(Camera *camera,
 	bool mainPathAvailable = true;
 
 	for (const StreamRole role : roles) {
+		Size size;
 
 		switch (role) {
 		case StreamRole::StillCapture:
 			/* JPEG encoders typically expect sYCC. */
 			if (!colorSpace)
 				colorSpace = ColorSpace::Sycc;
+
+			size = data->sensor_->resolution();
 			break;
 
 		case StreamRole::Viewfinder:
@@ -648,12 +653,16 @@ PipelineHandlerRkISP1::generateConfiguration(Camera *camera,
 			 */
 			if (!colorSpace)
 				colorSpace = ColorSpace::Sycc;
+
+			size = kRkISP1PreviewSize;
 			break;
 
 		case StreamRole::VideoRecording:
 			/* Rec. 709 is a good default for HD video recording. */
 			if (!colorSpace)
 				colorSpace = ColorSpace::Rec709;
+
+			size = kRkISP1PreviewSize;
 			break;
 
 		case StreamRole::Raw:
@@ -664,6 +673,7 @@ PipelineHandlerRkISP1::generateConfiguration(Camera *camera,
 			}
 
 			colorSpace = ColorSpace::Raw;
+			size = data->sensor_->resolution();
 			break;
 
 		default:
@@ -690,7 +700,7 @@ PipelineHandlerRkISP1::generateConfiguration(Camera *camera,
 		}
 
 		StreamConfiguration cfg =
-			path->generateConfiguration(data->sensor_.get(), role);
+			path->generateConfiguration(data->sensor_.get(), size, role);
 		if (!cfg.pixelFormat.isValid())
 			return nullptr;
 

src/libcamera/pipeline/rkisp1/rkisp1_path.cpp

@@ -127,15 +127,20 @@ void RkISP1Path::populateFormats()
 }
 
 StreamConfiguration
-RkISP1Path::generateConfiguration(const CameraSensor *sensor, StreamRole role)
+RkISP1Path::generateConfiguration(const CameraSensor *sensor, const Size &size,
+				  StreamRole role)
 {
 	const std::vector<unsigned int> &mbusCodes = sensor->mbusCodes();
 	const Size &resolution = sensor->resolution();
 
+	/* Min and max resolutions to populate the available stream formats. */
 	Size maxResolution = maxResolution_.boundedToAspectRatio(resolution)
 					   .boundedTo(resolution);
 	Size minResolution = minResolution_.expandedToAspectRatio(resolution);
 
+	/* The desired stream size, bound to the max resolution. */
+	Size streamSize = size.boundedTo(maxResolution);
+
 	/* Create the list of supported stream formats. */
 	std::map<PixelFormat, std::vector<SizeRange>> streamFormats;
 	unsigned int rawBitsPerPixel = 0;
@@ -189,7 +194,7 @@ RkISP1Path::generateConfiguration(const CameraSensor *sensor, StreamRole role)
 	StreamFormats formats(streamFormats);
 	StreamConfiguration cfg(formats);
 	cfg.pixelFormat = format;
-	cfg.size = maxResolution;
+	cfg.size = streamSize;
 	cfg.bufferCount = RKISP1_BUFFER_COUNT;
 
 	return cfg;

src/libcamera/pipeline/rkisp1/rkisp1_path.h

@@ -41,6 +41,7 @@ public:
 	bool isEnabled() const { return link_->flags() & MEDIA_LNK_FL_ENABLED; }
 
 	StreamConfiguration generateConfiguration(const CameraSensor *sensor,
+						  const Size &resolution,
 						  StreamRole role);
 	CameraConfiguration::Status validate(const CameraSensor *sensor,
 					     StreamConfiguration *cfg);