From e86aed6166449189eaf1b7e9d734236797e3d0c3 Mon Sep 17 00:00:00 2001
From: David Plowman <david.plowman@raspberrypi.com>
Date: Fri, 10 Dec 2021 14:44:19 +0000
Subject: libcamera: video_device: Convert between ColorSpace class and V4L2
 formats

Add functions to the V4L2Device class to convert to and from
libcamera ColorSpace.

These functions are added to the base V4L2Device class so that they can
be shared both by the video device class and subdevices.

With the ColorSpace class, the color space and related other fields
are stored together, corresponding to a number of fields in the
various different V4L2 format structures. Template functions are
therefore a convenient implementation, and we must explicitly
instantiate the templates that will be needed.

Note that unset color spaces are converted to requests for the
device's "default" color space.

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>
---
 include/libcamera/internal/v4l2_device.h | 8 ++++++++
 1 file changed, 8 insertions(+)

(limited to 'include')

diff --git a/include/libcamera/internal/v4l2_device.h b/include/libcamera/internal/v4l2_device.h
index 8886b750..a52a5f2c 100644
--- a/include/libcamera/internal/v4l2_device.h
+++ b/include/libcamera/internal/v4l2_device.h
@@ -9,6 +9,7 @@
 
 #include <map>
 #include <memory>
+#include <optional>
 #include <vector>
 
 #include <linux/videodev2.h>
@@ -18,6 +19,7 @@
 #include <libcamera/base/span.h>
 #include <libcamera/base/unique_fd.h>
 
+#include <libcamera/color_space.h>
 #include <libcamera/controls.h>
 
 namespace libcamera {
@@ -56,6 +58,12 @@ protected:
 
 	int fd() const { return fd_.get(); }
 
+	template<typename T>
+	static std::optional<ColorSpace> toColorSpace(const T &v4l2Format);
+
+	template<typename T>
+	static int fromColorSpace(const std::optional<ColorSpace> &colorSpace, T &v4l2Format);
+
 private:
 	static ControlType v4l2CtrlType(uint32_t ctrlType);
 	static std::unique_ptr<ControlId> v4l2ControlId(const v4l2_query_ext_ctrl &ctrl);
-- 
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