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ipa: ipu3: Use sensor limits for analogue gain

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Instead of using constants for the analogue gains limits, use the
minimum and maximum from the configured sensor.

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 2021-10-21 18:23:37 +02:00
parent 58486847f0
commit 43d098ce5f
2 changed files with 13 additions and 9 deletions
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19
src/ipa/ipu3/algorithms/agc.cpp
View file

@ -30,10 +30,9 @@ static constexpr uint32_t kInitialFrameMinAECount = 4;
/* Number of frames to wait between new gain/exposure estimations */
static constexpr uint32_t kFrameSkipCount = 6;
/* Maximum analogue gain value
* \todo grab it from a camera helper */
static constexpr double kMinGain = 1.0;
static constexpr double kMaxGain = 8.0;
/* Limits for analogue gain values */
static constexpr double kMinAnalogueGain = 1.0;
static constexpr double kMaxAnalogueGain = 8.0;
/* Histogram constants */
static constexpr uint32_t knumHistogramBins = 256;
@ -57,9 +56,11 @@ int Agc::configure(IPAContext &context, const IPAConfigInfo &configInfo)
minExposureLines_ = context.configuration.agc.minShutterSpeed / lineDuration_;
maxExposureLines_ = context.configuration.agc.maxShutterSpeed / lineDuration_;
minAnalogueGain_ = std::max(context.configuration.agc.minAnalogueGain, kMinAnalogueGain);
maxAnalogueGain_ = std::min(context.configuration.agc.maxAnalogueGain, kMaxAnalogueGain);
/* Configure the default exposure and gain. */
context.frameContext.agc.gain =
context.configuration.agc.minAnalogueGain;
context.frameContext.agc.gain = minAnalogueGain_;
context.frameContext.agc.exposure = minExposureLines_;
prevExposureValue_ = context.frameContext.agc.gain
@ -148,7 +149,7 @@ void Agc::lockExposureGain(uint32_t &exposure, double &analogueGain)
utils::Duration minShutterSpeed = minExposureLines_ * lineDuration_;
utils::Duration maxShutterSpeed = maxExposureLines_ * lineDuration_;
utils::Duration maxTotalExposure = maxShutterSpeed * kMaxGain;
utils::Duration maxTotalExposure = maxShutterSpeed * maxAnalogueGain_;
currentExposure_ = std::min(currentExposure_, maxTotalExposure);
LOG(IPU3Agc, Debug) << "Target total exposure " << currentExposure_
<< ", maximum is " << maxTotalExposure;
@ -163,10 +164,10 @@ void Agc::lockExposureGain(uint32_t &exposure, double &analogueGain)
* Push the shutter time up to the maximum first, and only then
* increase the gain.
*/
shutterTime = std::clamp<utils::Duration>(exposureValue / kMinGain,
shutterTime = std::clamp<utils::Duration>(exposureValue / minAnalogueGain_,
minShutterSpeed, maxShutterSpeed);
double stepGain = std::clamp(exposureValue / shutterTime,
kMinGain, kMaxGain);
minAnalogueGain_, maxAnalogueGain_);
LOG(IPU3Agc, Debug) << "Divided up shutter and gain are "
<< shutterTime << " and "
<< stepGain;

3
src/ipa/ipu3/algorithms/agc.h
View file

@ -45,6 +45,9 @@ private:
uint32_t minExposureLines_;
uint32_t maxExposureLines_;
double minAnalogueGain_;
double maxAnalogueGain_;
utils::Duration filteredExposure_;
utils::Duration currentExposure_;
utils::Duration prevExposureValue_;