[libcamera-devel] [PATCH v2 4/9] libcamera: camera_sensor: Register ColorFilterArrangement

[Jacopo Mondi]

Inspect the list of media bus codes supported by the camera sensor
in order to deduce the color filter arrangement and register the
ColorFilterArrangement draft property.

Signed-off-by: Jacopo Mondi <jacopo at jmondi.org>
---
 src/libcamera/camera_sensor.cpp | 36 +++++++++++++++++++++++++++++----
 1 file changed, 32 insertions(+), 4 deletions(-)

diff --git a/src/libcamera/camera_sensor.cpp b/src/libcamera/camera_sensor.cpp
index 1628ba9c892b..2b78eb4cb530 100644
--- a/src/libcamera/camera_sensor.cpp
+++ b/src/libcamera/camera_sensor.cpp
@@ -17,6 +17,7 @@
 
 #include <libcamera/property_ids.h>
 
+#include "libcamera/internal/bayer_format.h"
 #include "libcamera/internal/formats.h"
 #include "libcamera/internal/sysfs.h"
 #include "libcamera/internal/utils.h"
@@ -178,10 +179,6 @@ int CameraSensor::init()
 	if (ret < 0)
 		return ret;
 
-	ret = initProperties();
-	if (ret)
-		return ret;
-
 	/* Enumerate, sort and cache media bus codes and sizes. */
 	formats_ = subdev_->formats(pad_);
 	if (formats_.empty()) {
@@ -210,6 +207,10 @@ int CameraSensor::init()
 	 */
 	resolution_ = sizes_.back();
 
+	ret = initProperties();
+	if (ret)
+		return ret;
+
 	return 0;
 }
 
@@ -307,6 +308,33 @@ int CameraSensor::initProperties()
 		properties_.set(properties::PixelArrayActiveAreas, { crop });
 	}
 
+	/* Color filter arrangement, default to the generic 'RGB' */
+	int32_t cfa = properties::draft::RGB;
+	for (const auto &format : formats_) {
+		unsigned int mbusCode = format.first;
+		BayerFormat bayerFormat(mbusCode);
+		if (!bayerFormat.isValid())
+			continue;
+
+		/* Report the CFA ordering of the first valid RAW Bayer format. */
+		switch (bayerFormat.order) {
+		case BayerFormat::BGGR:
+			cfa = properties::draft::BGGR;
+			break;
+		case BayerFormat::GBRG:
+			cfa = properties::draft::GBRG;
+			break;
+		case BayerFormat::GRBG:
+			cfa = properties::draft::GRBG;
+			break;
+		case BayerFormat::RGGB:
+			cfa = properties::draft::RGGB;
+			break;
+		}
+		break;
+	}
+	properties_.set(properties::draft::ColorFilterArrangement, cfa);
+
 	return 0;
 }
 
-- 
2.29.2