[libcamera-devel] [PATCH v1 7/9] ipa: raspberrypi: Add line length calculations helper functions
Naushir Patuck
naush at raspberrypi.com
Mon Oct 3 10:39:33 CEST 2022
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 at raspberrypi.com>
---
src/ipa/raspberrypi/cam_helper.cpp | 16 ++++++++++++++++
src/ipa/raspberrypi/cam_helper.h | 3 +++
2 files changed, 19 insertions(+)
diff --git a/src/ipa/raspberrypi/cam_helper.cpp b/src/ipa/raspberrypi/cam_helper.cpp
index 916632f83037..c255ab0cb53f 100644
--- a/src/ipa/raspberrypi/cam_helper.cpp
+++ b/src/ipa/raspberrypi/cam_helper.cpp
@@ -19,6 +19,7 @@
using namespace RPiController;
using namespace libcamera;
using libcamera::utils::Duration;
+using namespace std::literals::chrono_literals;
namespace libcamera {
LOG_DECLARE_CATEGORY(IPARPI)
@@ -102,6 +103,21 @@ 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 hblankToLineLength(lineLengthPck - mode_.width);
+}
+
void CamHelper::setCameraMode(const CameraMode &mode)
{
mode_ = mode;
diff --git a/src/ipa/raspberrypi/cam_helper.h b/src/ipa/raspberrypi/cam_helper.h
index 1bbdd715d2b1..b5c0726ff00e 100644
--- a/src/ipa/raspberrypi/cam_helper.h
+++ b/src/ipa/raspberrypi/cam_helper.h
@@ -85,6 +85,9 @@ public:
virtual uint32_t getVBlanking(libcamera::utils::Duration &exposure,
libcamera::utils::Duration minFrameDuration,
libcamera::utils::Duration maxFrameDuration) const;
+ libcamera::utils::Duration hblankToLineLength(uint32_t hblank) const;
+ uint32_t lineLengthToHblank(const libcamera::utils::Duration &duration) const;
+ libcamera::utils::Duration lineLengthPckToDuration(uint32_t lineLengthPck) const;
virtual uint32_t gainCode(double gain) const = 0;
virtual double gain(uint32_t gainCode) const = 0;
virtual void getDelays(int &exposureDelay, int &gainDelay,
--
2.25.1
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