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-rw-r--r--src/ipa/ipu3/algorithms/agc.cpp19
-rw-r--r--src/ipa/ipu3/algorithms/agc.h1
2 files changed, 18 insertions, 2 deletions
diff --git a/src/ipa/ipu3/algorithms/agc.cpp b/src/ipa/ipu3/algorithms/agc.cpp
index e7c59f3d..43ef89df 100644
--- a/src/ipa/ipu3/algorithms/agc.cpp
+++ b/src/ipa/ipu3/algorithms/agc.cpp
@@ -42,7 +42,8 @@ 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)
+ filteredExposureNoDg_(0s), currentExposure_(0s),
+ currentExposureNoDg_(0s), prevExposureValue_(0s)
{
}
@@ -62,6 +63,10 @@ int Agc::configure(IPAContext &context, const IPAConfigInfo &configInfo)
context.configuration.agc.minAnalogueGain;
context.frameContext.agc.exposure = minExposureLines_;
+ prevExposureValue_ = context.frameContext.agc.gain
+ * context.frameContext.agc.exposure
+ * lineDuration_;
+
return 0;
}
@@ -147,7 +152,7 @@ void Agc::lockExposureGain(uint32_t &exposure, double &analogueGain)
<< " Gain " << analogueGain
<< " Needed ev gain " << evGain;
- currentExposure_ = currentExposureNoDg_ * evGain;
+ currentExposure_ = prevExposureValue_ * evGain;
utils::Duration minShutterSpeed = minExposureLines_ * lineDuration_;
utils::Duration maxShutterSpeed = maxExposureLines_ * lineDuration_;
@@ -176,6 +181,16 @@ void Agc::lockExposureGain(uint32_t &exposure, double &analogueGain)
exposure = shutterTime / lineDuration_;
analogueGain = stepGain;
+
+ /*
+ * Update the exposure value for the next process call.
+ *
+ * \todo Obtain the values of the exposure time and analog gain
+ * that were actually used by the sensor, either from embedded
+ * data when available, or from the delayed controls
+ * infrastructure in case a slow down caused a mismatch.
+ */
+ prevExposureValue_ = shutterTime * analogueGain;
}
lastFrame_ = frameCount_;
}
diff --git a/src/ipa/ipu3/algorithms/agc.h b/src/ipa/ipu3/algorithms/agc.h
index cd26d08c..2ae88e9f 100644
--- a/src/ipa/ipu3/algorithms/agc.h
+++ b/src/ipa/ipu3/algorithms/agc.h
@@ -49,6 +49,7 @@ private:
utils::Duration filteredExposureNoDg_;
utils::Duration currentExposure_;
utils::Duration currentExposureNoDg_;
+ utils::Duration prevExposureValue_;
uint32_t stride_;
};