diff options
| author | Jean-Michel Hautbois <jeanmichel.hautbois@ideasonboard.com> | 2021-10-21 18:23:37 +0200 |
|---|---|---|
| committer | Jean-Michel Hautbois <jeanmichel.hautbois@ideasonboard.com> | 2021-10-22 09:29:25 +0200 |
| commit | 43d098ce5f2733dbde249d33d3b418cbeadfaaa5 (patch) | |
| tree | 5b70fbdf8193d9dcb825f5dbfb4a97e18783688e /src/ipa/ipu3/algorithms/agc.cpp | |
| parent | 58486847f09a0ef72f4421135986471457e003cb (diff) | |
ipa: ipu3: Use sensor limits for analogue gain
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>
Diffstat (limited to 'src/ipa/ipu3/algorithms/agc.cpp')
| -rw-r--r-- | src/ipa/ipu3/algorithms/agc.cpp | 19 |
1 files changed, 10 insertions, 9 deletions
diff --git a/src/ipa/ipu3/algorithms/agc.cpp b/src/ipa/ipu3/algorithms/agc.cpp index 74e94544..6c151232 100644 --- a/src/ipa/ipu3/algorithms/agc.cpp +++ b/src/ipa/ipu3/algorithms/agc.cpp @@ -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; |