ipa: raspberrypi: Add line length calculations helper functions

Add CamHelper::hblankToLineLength() to calculate the line length
duration from the horizontal blanking (in pixels) value.

Add CamHelper::lineLengthToHblank() to calculate the horizontal blanking
(in pixels) value from the line length duration.

Add CamHelper::lineLengthPckToDuration() to calculate the line length
duration from the line length in pixels.

Signed-off-by: Naushir Patuck <naush@raspberrypi.com>
Tested-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

1 files changed, 16 insertions, 0 deletions

diff --git a/src/ipa/raspberrypi/cam_helper.cpp b/src/ipa/raspberrypi/cam_helper.cpp
index dd7236f1..bc3f66a5 100644
--- a/src/ipa/raspberrypi/cam_helper.cpp
+++ b/src/ipa/raspberrypi/cam_helper.cpp
@@ -18,6 +18,7 @@
 using namespace RPiController;
 using namespace libcamera;
 using libcamera::utils::Duration;
+using namespace std::literals::chrono_literals;
 
 namespace libcamera {
 LOG_DECLARE_CATEGORY(IPARPI)
@@ -96,6 +97,21 @@ uint32_t CamHelper::getVBlanking(Duration &exposure,
 	return vblank;
 }
 
+Duration CamHelper::hblankToLineLength(uint32_t hblank) const
+{
+	return (mode_.width + hblank) * (1.0s / mode_.pixelRate);
+}
+
+uint32_t CamHelper::lineLengthToHblank(const Duration &lineLength) const
+{
+	return (lineLength * mode_.pixelRate / 1.0s) - mode_.width;
+}
+
+Duration CamHelper::lineLengthPckToDuration(uint32_t lineLengthPck) const
+{
+	return lineLengthPck * (1.0s / mode_.pixelRate);
+}
+
 void CamHelper::setCameraMode(const CameraMode &mode)
 {
 	mode_ = mode;