libcamera: v4l2_subdevice: Add colorSpace field to V4L2SubdeviceFormat

This adds a ColorSpace field to the V4L2SubdeviceFormat so that we can
set and request particular color spaces from V4L2.

This commit simply adds the field and fixes some occurrences of brace
initializers that would otherwise be broken. A subsequent commit will
pass and retrieve the value correctly to/from V4l2 itself.

Signed-off-by: David Plowman <david.plowman@raspberrypi.com>
Reviewed-by: Jacopo Mondi <jacopo@jmondi.org>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

5 files changed, 28 insertions, 6 deletions

diff --git a/include/libcamera/internal/v4l2_subdevice.h b/include/libcamera/internal/v4l2_subdevice.h
index a6873b67..58d1e511 100644
--- a/include/libcamera/internal/v4l2_subdevice.h
+++ b/include/libcamera/internal/v4l2_subdevice.h
@@ -8,12 +8,14 @@
 #pragma once
 
 #include <memory>
+#include <optional>
 #include <string>
 #include <vector>
 
 #include <libcamera/base/class.h>
 #include <libcamera/base/log.h>
 
+#include <libcamera/color_space.h>
 #include <libcamera/geometry.h>
 
 #include "libcamera/internal/formats.h"
@@ -27,6 +29,7 @@ class MediaDevice;
 struct V4L2SubdeviceFormat {
 	uint32_t mbus_code;
 	Size size;
+	std::optional<ColorSpace> colorSpace;
 
 	const std::string toString() const;
 	uint8_t bitsPerPixel() const;
diff --git a/src/libcamera/camera_sensor.cpp b/src/libcamera/camera_sensor.cpp
index 7bb39b1e..c3999d35 100644
--- a/src/libcamera/camera_sensor.cpp
+++ b/src/libcamera/camera_sensor.cpp
@@ -642,6 +642,7 @@ V4L2SubdeviceFormat CameraSensor::getFormat(const std::vector<unsigned int> &mbu
 	V4L2SubdeviceFormat format{
 		.mbus_code = bestCode,
 		.size = *bestSize,
+		.colorSpace = ColorSpace::Raw,
 	};
 
 	return format;
diff --git a/src/libcamera/pipeline/ipu3/cio2.cpp b/src/libcamera/pipeline/ipu3/cio2.cpp
index 59dda56b..f4e8c663 100644
--- a/src/libcamera/pipeline/ipu3/cio2.cpp
+++ b/src/libcamera/pipeline/ipu3/cio2.cpp
@@ -322,10 +322,9 @@ V4L2SubdeviceFormat CIO2Device::getSensorFormat(const std::vector<unsigned int>
 		return {};
 	}
 
-	V4L2SubdeviceFormat format{
-		.mbus_code = bestCode,
-		.size = bestSize,
-	};
+	V4L2SubdeviceFormat format{};
+	format.mbus_code = bestCode;
+	format.size = bestSize;
 
 	return format;
 }
diff --git a/src/libcamera/pipeline/simple/simple.cpp b/src/libcamera/pipeline/simple/simple.cpp
index fdff4ebd..8aa36306 100644
--- a/src/libcamera/pipeline/simple/simple.cpp
+++ b/src/libcamera/pipeline/simple/simple.cpp
@@ -457,7 +457,9 @@ int SimpleCameraData::init()
 	 * formats on the video node.
 	 */
 	for (unsigned int code : sensor_->mbusCodes()) {
-		V4L2SubdeviceFormat format{ code, sensor_->resolution() };
+		V4L2SubdeviceFormat format{};
+		format.mbus_code = code;
+		format.size = sensor_->resolution();
 
 		ret = setupFormats(&format, V4L2Subdevice::TryFormat);
 		if (ret < 0) {
@@ -908,7 +910,9 @@ int SimplePipelineHandler::configure(Camera *camera, CameraConfiguration *c)
 		return ret;
 
 	const SimpleCameraData::Configuration *pipeConfig = config->pipeConfig();
-	V4L2SubdeviceFormat format{ pipeConfig->code, data->sensor_->resolution() };
+	V4L2SubdeviceFormat format{};
+	format.mbus_code = pipeConfig->code;
+	format.size = data->sensor_->resolution();
 
 	ret = data->setupFormats(&format, V4L2Subdevice::ActiveFormat);
 	if (ret < 0)
diff --git a/src/libcamera/v4l2_subdevice.cpp b/src/libcamera/v4l2_subdevice.cpp
index 61e15b69..b782325a 100644
--- a/src/libcamera/v4l2_subdevice.cpp
+++ b/src/libcamera/v4l2_subdevice.cpp
@@ -170,6 +170,21 @@ const std::map<uint32_t, V4L2SubdeviceFormatInfo> formatInfoMap = {
  */
 
 /**
+ * \var V4L2SubdeviceFormat::colorSpace
+ * \brief The color space of the pixels
+ *
+ * The color space of the image. When setting the format this may be
+ * unset, in which case the driver gets to use its default color space.
+ * After being set, this value should contain the color space that
+ * was actually used. If this value is unset, then the color space chosen
+ * by the driver could not be represented by the ColorSpace class (and
+ * should probably be added).
+ *
+ * It is up to the pipeline handler or application to check if the
+ * resulting color space is acceptable.
+ */
+
+/**
  * \brief Assemble and return a string describing the format
  * \return A string describing the V4L2SubdeviceFormat
  */