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ipa: ipu3: agc: Rename gains properly

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We have mixed terms between gain, analogue gain and the exposure value
gain.

Make it clear when we are using the analogue gain from the sensor, and
when we are using the calculated gain to be applied to the exposure
value to reach the target.

Signed-off-by: Jean-Michel Hautbois <jeanmichel.hautbois@ideasonboard.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
This commit is contained in:
Jean-Michel Hautbois
2021-10-12 17:01:15 +02:00
parent 17dbae2325
commit fd5a82ea88
1 changed files with 9 additions and 8 deletions
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17
src/ipa/ipu3/algorithms/agc.cpp
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@@ -125,7 +125,7 @@ void Agc::filterExposure()
LOG(IPU3Agc, Debug) << "After filtering, total_exposure " << filteredExposure_;
}
void Agc::lockExposureGain(uint32_t &exposure, double &gain)
void Agc::lockExposureGain(uint32_t &exposure, double &analogueGain)
{
/* Algorithm initialization should wait for first valid frames */
/* \todo - have a number of frames given by DelayedControls ?
@@ -137,16 +137,17 @@ void Agc::lockExposureGain(uint32_t &exposure, double &gain)
if (std::abs(iqMean_ - kEvGainTarget * knumHistogramBins) <= 1) {
LOG(IPU3Agc, Debug) << "!!! Good exposure with iqMean = " << iqMean_;
} else {
double newGain = kEvGainTarget * knumHistogramBins / iqMean_;
double evGain = kEvGainTarget * knumHistogramBins / iqMean_;
/* extracted from Rpi::Agc::computeTargetExposure */
utils::Duration currentShutter = exposure * lineDuration_;
currentExposureNoDg_ = currentShutter * gain;
currentExposureNoDg_ = currentShutter * analogueGain;
LOG(IPU3Agc, Debug) << "Actual total exposure " << currentExposureNoDg_
<< " Shutter speed " << currentShutter
<< " Gain " << gain;
<< " Gain " << analogueGain
<< " Needed ev gain " << evGain;
currentExposure_ = currentExposureNoDg_ * newGain;
currentExposure_ = currentExposureNoDg_ * evGain;
utils::Duration minShutterSpeed = minExposureLines_ * lineDuration_;
utils::Duration maxShutterSpeed = maxExposureLines_ * lineDuration_;
@@ -174,7 +175,7 @@ void Agc::lockExposureGain(uint32_t &exposure, double &gain)
<< stepGain;
exposure = shutterTime / lineDuration_;
gain = stepGain;
analogueGain = stepGain;
}
lastFrame_ = frameCount_;
}
@@ -182,9 +183,9 @@ void Agc::lockExposureGain(uint32_t &exposure, double &gain)
void Agc::process(IPAContext &context, const ipu3_uapi_stats_3a *stats)
{
uint32_t &exposure = context.frameContext.agc.exposure;
double &gain = context.frameContext.agc.gain;
double &analogueGain = context.frameContext.agc.gain;
processBrightness(stats, context.configuration.grid.bdsGrid);
lockExposureGain(exposure, gain);
lockExposureGain(exposure, analogueGain);
frameCount_++;
}