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authorJean-Michel Hautbois <jeanmichel.hautbois@ideasonboard.com>2021-10-21 18:23:37 +0200
committerJean-Michel Hautbois <jeanmichel.hautbois@ideasonboard.com>2021-10-22 09:29:25 +0200
commit43d098ce5f2733dbde249d33d3b418cbeadfaaa5 (patch)
tree5b70fbdf8193d9dcb825f5dbfb4a97e18783688e /src/ipa/ipu3/algorithms/agc.cpp
parent58486847f09a0ef72f4421135986471457e003cb (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.cpp19
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;