ipa: rkisp1: Introduce AGC

Now that we have IPAContext and Algorithm, we can implement a simple AGC
based on the IPU3 one. It is very similar, except that there is no
histogram used for an inter quantile mean. The RkISP1 is returning a 5x5
array (for V10) of luminance means. Estimating the relative luminance is
thus a simple mean of all the blocks already calculated by the ISP.

Signed-off-by: Jean-Michel Hautbois <jeanmichel.hautbois@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>

1 files changed, 22 insertions, 0 deletions

diff --git a/src/ipa/rkisp1/ipa_context.h b/src/ipa/rkisp1/ipa_context.h
index 9342025b..b94ade0c 100644
--- a/src/ipa/rkisp1/ipa_context.h
+++ b/src/ipa/rkisp1/ipa_context.h
@@ -10,17 +10,39 @@
 
 #include <linux/rkisp1-config.h>
 
+#include <libcamera/base/utils.h>
+
 namespace libcamera {
 
 namespace ipa::rkisp1 {
 
 struct IPASessionConfiguration {
 	struct {
+		utils::Duration minShutterSpeed;
+		utils::Duration maxShutterSpeed;
+		double minAnalogueGain;
+		double maxAnalogueGain;
+	} agc;
+
+	struct {
+		utils::Duration lineDuration;
+	} sensor;
+
+	struct {
 		rkisp1_cif_isp_version revision;
 	} hw;
 };
 
 struct IPAFrameContext {
+	struct {
+		uint32_t exposure;
+		double gain;
+	} agc;
+
+	struct {
+		uint32_t exposure;
+		double gain;
+	} sensor;
 };
 
 struct IPAContext {