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ipa: raspberrypi: Add line length calculations helper functions

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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>
This commit is contained in:
Naushir Patuck 2022-10-06 14:17:41 +01:00 • committed by Laurent Pinchart
parent 5661c934ec
commit 51ac3e2671
2 changed files with 19 additions and 0 deletions
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16
src/ipa/raspberrypi/cam_helper.cpp
View file

@ -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;

3
src/ipa/raspberrypi/cam_helper.h
View file

@ -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,