@@ -101,7 +101,8 @@ int Agc::configure(IPAContext &context,
/* Configure the default exposure and gain. */
activeState.agc.gain = std::max(minAnalogueGain_, kMinAnalogueGain);
- activeState.agc.exposure = 10ms / configuration.sensor.lineDuration;
+ activeState.agc.exposure = 10ms /
+ std::chrono::duration(configuration.sensor.lineDuration);
frameCount_ = 0;
return 0;
@@ -241,17 +242,20 @@ void Agc::computeExposure(IPAContext &context, IPAFrameContext &frameContext,
* increase the gain.
*/
utils::Duration shutterTime =
- std::clamp<utils::Duration>(exposureValue / minAnalogueGain_,
- minShutterSpeed_, maxShutterSpeed_);
- double stepGain = std::clamp(exposureValue / shutterTime,
- minAnalogueGain_, maxAnalogueGain_);
+ std::clamp<utils::Duration>(std::chrono::duration(exposureValue) /
+ minAnalogueGain_,
+ minShutterSpeed_, maxShutterSpeed_);
+ double stepGain = std::clamp(std::chrono::duration(exposureValue) /
+ std::chrono::duration(shutterTime),
+ minAnalogueGain_, maxAnalogueGain_);
LOG(IPU3Agc, Debug) << "Divided up shutter and gain are "
<< shutterTime << " and "
<< stepGain;
IPAActiveState &activeState = context.activeState;
/* Update the estimated exposure and gain. */
- activeState.agc.exposure = shutterTime / configuration.sensor.lineDuration;
+ activeState.agc.exposure = std::chrono::duration(shutterTime) /
+ std::chrono::duration(configuration.sensor.lineDuration);
activeState.agc.gain = stepGain;
}
@@ -63,7 +63,7 @@ void CamHelper::process([[maybe_unused]] StatisticsPtr &stats,
uint32_t CamHelper::exposureLines(const Duration exposure, const Duration lineLength) const
{
- return exposure / lineLength;
+ return std::chrono::duration(exposure) / std::chrono::duration(lineLength);
}
Duration CamHelper::exposure(uint32_t exposureLines, const Duration lineLength) const
@@ -85,8 +85,8 @@ std::pair<uint32_t, uint32_t> CamHelper::getBlanking(Duration &exposure,
* frameLengthMax gets calculated on the smallest line length as we do
* not want to extend that unless absolutely necessary.
*/
- frameLengthMin = minFrameDuration / mode_.minLineLength;
- frameLengthMax = maxFrameDuration / mode_.minLineLength;
+ frameLengthMin = std::chrono::duration(minFrameDuration) / std::chrono::duration(mode_.minLineLength);
+ frameLengthMax = std::chrono::duration(maxFrameDuration) / std::chrono::duration(mode_.minLineLength);
/*
* Watch out for (exposureLines + frameIntegrationDiff_) overflowing a
@@ -57,7 +57,8 @@ double CamHelperImx296::gain(uint32_t gainCode) const
uint32_t CamHelperImx296::exposureLines(const Duration exposure,
[[maybe_unused]] const Duration lineLength) const
{
- return std::max<uint32_t>(minExposureLines, (exposure - 14.26us) / timePerLine);
+ return std::max<uint32_t>(minExposureLines, std::chrono::duration(exposure - 14.26us) /
+ std::chrono::duration(timePerLine));
}
Duration CamHelperImx296::exposure(uint32_t exposureLines,
@@ -418,7 +418,8 @@ void Agc::prepare(Metadata *imageMetadata)
Duration actualExposure = deviceStatus.shutterSpeed *
deviceStatus.analogueGain;
if (actualExposure) {
- status_.digitalGain = status_.totalExposureValue / actualExposure;
+ status_.digitalGain = std::chrono::duration(status_.totalExposureValue) /
+ std::chrono::duration(actualExposure);
LOG(RPiAgc, Debug) << "Want total exposure " << status_.totalExposureValue;
/*
* Never ask for a gain < 1.0, and also impose
@@ -823,7 +824,8 @@ void Agc::divideUpExposure()
}
if (status_.fixedAnalogueGain == 0.0) {
if (exposureMode_->gain[stage] * shutterTime >= exposureValue) {
- analogueGain = exposureValue / shutterTime;
+ analogueGain = std::chrono::duration(exposureValue) /
+ std::chrono::duration(shutterTime);
break;
}
analogueGain = exposureMode_->gain[stage];
@@ -838,10 +840,12 @@ void Agc::divideUpExposure()
*/
if (!status_.fixedShutter && !status_.fixedAnalogueGain &&
status_.flickerPeriod) {
- int flickerPeriods = shutterTime / status_.flickerPeriod;
+ int flickerPeriods = std::chrono::duration(shutterTime) /
+ std::chrono::duration(status_.flickerPeriod);
if (flickerPeriods) {
Duration newShutterTime = flickerPeriods * status_.flickerPeriod;
- analogueGain *= shutterTime / newShutterTime;
+ analogueGain *= std::chrono::duration(shutterTime) /
+ std::chrono::duration(newShutterTime);
/*
* We should still not allow the ag to go over the
* largest value in the exposure mode. Note that this
@@ -94,7 +94,8 @@ void Lux::process(StatisticsPtr &stats, Metadata *imageMetadata)
double currentY = sum / (double)num + .5;
double gainRatio = referenceGain_ / currentGain;
double shutterSpeedRatio =
- referenceShutterSpeed_ / deviceStatus.shutterSpeed;
+ std::chrono::duration(referenceShutterSpeed_) /
+ std::chrono::duration(deviceStatus.shutterSpeed);
double apertureRatio = referenceAperture_ / currentAperture;
double yRatio = currentY * (65536 / numBins) / referenceY_;
double estimatedLux = shutterSpeedRatio * gainRatio *
@@ -75,7 +75,8 @@ int Agc::configure(IPAContext &context, const IPACameraSensorInfo &configInfo)
{
/* Configure the default exposure and gain. */
context.activeState.agc.gain = std::max(context.configuration.agc.minAnalogueGain, kMinAnalogueGain);
- context.activeState.agc.exposure = 10ms / context.configuration.sensor.lineDuration;
+ context.activeState.agc.exposure = 10ms /
+ std::chrono::duration(context.configuration.sensor.lineDuration);
/*
* According to the RkISP1 documentation:
@@ -213,16 +214,19 @@ void Agc::computeExposure(IPAContext &context, IPAFrameContext &frameContext,
* Push the shutter time up to the maximum first, and only then
* increase the gain.
*/
- utils::Duration shutterTime = std::clamp<utils::Duration>(exposureValue / minAnalogueGain,
+ utils::Duration shutterTime = std::clamp<utils::Duration>(std::chrono::duration(exposureValue) /
+ minAnalogueGain,
minShutterSpeed, maxShutterSpeed);
- double stepGain = std::clamp(exposureValue / shutterTime,
+ double stepGain = std::clamp(std::chrono::duration(exposureValue) /
+ std::chrono::duration(shutterTime),
minAnalogueGain, maxAnalogueGain);
LOG(RkISP1Agc, Debug) << "Divided up shutter and gain are "
<< shutterTime << " and "
<< stepGain;
/* Update the estimated exposure and gain. */
- activeState.agc.exposure = shutterTime / configuration.sensor.lineDuration;
+ activeState.agc.exposure = std::chrono::duration(shutterTime) /
+ std::chrono::duration(configuration.sensor.lineDuration);
activeState.agc.gain = stepGain;
}
A bug in libcxx [0] used by clang version 11.0.2 is prevalent when building libcamera for Android SDK30. This has been fixed and integrated upstream with [1]. As a workaround, directly cast libcamera::utils::Duration objects to std::chrono::duration when dividing. Alternatives evaluated: Considered: Enable public inheritance of std::chrono::duration and override operator/ in the class. Outcome: Does not fix the original compiler error. Considered: Enable public inheritance of std::chrono::duration and override operator/ in the libcamera namespace. Outcome: new compiler error: ld.lld: error: duplicate symbol: libcamera::operator/ (libcamera::utils::Duration const&, libcamera::utils::Duration const&) Considered: Use private inheritance of std::chrono::duration and re-implement a pass-through version of each std::chrono::duration operator within libcamera::utils::Duration and use template metaprogramming to fix the division operator. Outcome: Testing shows that this would introduce substantial limitations, i.e. requring the Duration object to be on the LHS of any arithmetic operation with other numeric types. This also substantially increases implementation complexity. Considered: Extract double values from libcamera::utils::Duration objects and use those to divide. Outcome: This creates substantial readability and unit-safety issues. [0] https://github.com/llvm/llvm-project/issues/40475 [1] https://github.com/llvm/llvm-project/commit/efa6d803c624f9251d0ab7881122501bb9d27368 Bug: https://bugs.libcamera.org/show_bug.cgi?id=156 Signed-off-by: Nicholas Roth <nicholas@rothemail.net> --- src/ipa/ipu3/algorithms/agc.cpp | 16 ++++++++++------ src/ipa/raspberrypi/cam_helper.cpp | 6 +++--- src/ipa/raspberrypi/cam_helper_imx296.cpp | 3 ++- src/ipa/raspberrypi/controller/rpi/agc.cpp | 12 ++++++++---- src/ipa/raspberrypi/controller/rpi/lux.cpp | 3 ++- src/ipa/rkisp1/algorithms/agc.cpp | 12 ++++++++---- 6 files changed, 33 insertions(+), 19 deletions(-)