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ipa: raspberrypi: Add sensitivity field to camera mode

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We use the CamHelper class to initialise it to the usual value of 1.

The CamHelper's GetModeSensitivity method can be redefined to
implement a different behaviour for sensors that require it.

Signed-off-by: David Plowman <david.plowman@raspberrypi.com>
Reviewed-by: Naushir Patuck <naush@raspberrypi.com>
Acked-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
This commit is contained in:
David Plowman 2021-07-18 19:51:24 +01:00 • committed by Kieran Bingham
parent 2288550f7d
commit d0c429c34c
4 changed files with 22 additions and 0 deletions
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11
src/ipa/raspberrypi/cam_helper.cpp
View file

@ -129,6 +129,17 @@ bool CamHelper::SensorEmbeddedDataPresent() const
return false;
}
double CamHelper::GetModeSensitivity([[maybe_unused]] const CameraMode &mode) const
{
/*
* Most sensors have the same sensitivity in every mode, but this
* method can be overridden for those that do not. Note that it is
* called before mode_ is set, so it must return the sensitivity
* of the mode that is passed in.
*/
return 1.0;
}
unsigned int CamHelper::HideFramesStartup() const
{
/*

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

@ -41,6 +41,8 @@ namespace RPiController {
//
// A method to query if the sensor outputs embedded data that can be parsed.
//
// A method to return the sensitivity of a given camera mode.
//
// A parser to parse the embedded data buffers provided by some sensors (for
// example, the imx219 does; the ov5647 doesn't). This allows us to know for
// sure the exposure and gain of the frame we're looking at. CamHelper
@ -84,6 +86,7 @@ public:
virtual void GetDelays(int &exposure_delay, int &gain_delay,
int &vblank_delay) const;
virtual bool SensorEmbeddedDataPresent() const;
virtual double GetModeSensitivity(const CameraMode &mode) const;
virtual unsigned int HideFramesStartup() const;
virtual unsigned int HideFramesModeSwitch() const;
virtual unsigned int MistrustFramesStartup() const;

2
src/ipa/raspberrypi/controller/camera_mode.h
View file

@ -41,6 +41,8 @@ struct CameraMode {
libcamera::Transform transform;
// minimum and maximum fame lengths in units of lines
uint32_t min_frame_length, max_frame_length;
// sensitivity of this mode
double sensitivity;
};
#ifdef __cplusplus

6
src/ipa/raspberrypi/raspberrypi.cpp
View file

@ -325,6 +325,12 @@ void IPARPi::setMode(const IPACameraSensorInfo &sensorInfo)
*/
mode_.min_frame_length = sensorInfo.minFrameLength;
mode_.max_frame_length = sensorInfo.maxFrameLength;
/*
* Some sensors may have different sensitivities in different modes;
* the CamHelper will know the correct value.
*/
mode_.sensitivity = helper_->GetModeSensitivity(mode_);
}
int IPARPi::configure(const IPACameraSensorInfo &sensorInfo,