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ipa: ipu3: agc: Remove unused variables

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We currently control the exposure value by the shutter speed and the
analogue gain. We can't use the digital gain to have more than the
maximum exposure value calculated because we are not controlling it.

Remove unused code associated with this digital gain.

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>
This commit is contained in:
Jean-Michel Hautbois
2021-10-12 20:58:17 +02:00
parent cbf2c9a612
commit 58486847f0
2 changed files with 3 additions and 18 deletions
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19
src/ipa/ipu3/algorithms/agc.cpp
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@@ -42,8 +42,7 @@ static constexpr double kEvGainTarget = 0.5;
Agc::Agc()
: frameCount_(0), lastFrame_(0), iqMean_(0.0), lineDuration_(0s),
minExposureLines_(0), maxExposureLines_(0), filteredExposure_(0s),
filteredExposureNoDg_(0s), currentExposure_(0s),
currentExposureNoDg_(0s), prevExposureValue_(0s)
currentExposure_(0s), prevExposureValue_(0s)
{
}
@@ -102,7 +101,6 @@ void Agc::filterExposure()
if (filteredExposure_ == 0s) {
/* DG stands for digital gain.*/
filteredExposure_ = currentExposure_;
filteredExposureNoDg_ = currentExposureNoDg_;
} else {
/*
* If we are close to the desired result, go faster to avoid making
@@ -115,18 +113,8 @@ void Agc::filterExposure()
filteredExposure_ = speed * currentExposure_ +
filteredExposure_ * (1.0 - speed);
filteredExposureNoDg_ = speed * currentExposureNoDg_ +
filteredExposureNoDg_ * (1.0 - speed);
}
/*
* We can't let the no_dg exposure deviate too far below the
* total exposure, as there might not be enough digital gain available
* in the ISP to hide it (which will cause nasty oscillation).
*/
double fastReduceThreshold = 0.4;
if (filteredExposureNoDg_ <
filteredExposure_ * fastReduceThreshold)
filteredExposureNoDg_ = filteredExposure_ * fastReduceThreshold;
LOG(IPU3Agc, Debug) << "After filtering, total_exposure " << filteredExposure_;
}
@@ -151,8 +139,7 @@ void Agc::lockExposureGain(uint32_t &exposure, double &analogueGain)
/* extracted from Rpi::Agc::computeTargetExposure */
utils::Duration currentShutter = exposure * lineDuration_;
currentExposureNoDg_ = currentShutter * analogueGain;
LOG(IPU3Agc, Debug) << "Actual total exposure " << currentExposureNoDg_
LOG(IPU3Agc, Debug) << "Actual total exposure " << currentShutter * analogueGain
<< " Shutter speed " << currentShutter
<< " Gain " << analogueGain
<< " Needed ev gain " << evGain;

2
src/ipa/ipu3/algorithms/agc.h
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@@ -46,9 +46,7 @@ private:
uint32_t maxExposureLines_;
utils::Duration filteredExposure_;
utils::Duration filteredExposureNoDg_;
utils::Duration currentExposure_;
utils::Duration currentExposureNoDg_;
utils::Duration prevExposureValue_;
uint32_t stride_;