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-rw-r--r--src/libcamera/pipeline/raspberrypi/raspberrypi.cpp34
1 files changed, 34 insertions, 0 deletions
diff --git a/src/libcamera/pipeline/raspberrypi/raspberrypi.cpp b/src/libcamera/pipeline/raspberrypi/raspberrypi.cpp
index 168bbcef..49d7ff23 100644
--- a/src/libcamera/pipeline/raspberrypi/raspberrypi.cpp
+++ b/src/libcamera/pipeline/raspberrypi/raspberrypi.cpp
@@ -272,6 +272,12 @@ public:
unsigned int dropFrameCount_;
+ /*
+ * If set, this stores the value that represets a gain of one for
+ * the V4L2_CID_NOTIFY_GAINS control.
+ */
+ std::optional<int32_t> notifyGainsUnity_;
+
private:
void checkRequestCompleted();
void fillRequestMetadata(const ControlList &bufferControls,
@@ -1249,6 +1255,15 @@ int PipelineHandlerRPi::registerCamera(MediaDevice *unicam, MediaDevice *isp, Me
data->properties_ = data->sensor_->properties();
/*
+ * The V4L2_CID_NOTIFY_GAINS control, if present, is used to inform the
+ * sensor of the colour gains. It is defined to be a linear gain where
+ * the default value represents a gain of exactly one.
+ */
+ auto it = data->sensor_->controls().find(V4L2_CID_NOTIFY_GAINS);
+ if (it != data->sensor_->controls().end())
+ data->notifyGainsUnity_ = it->second.def().get<int32_t>();
+
+ /*
* Set a default value for the ScalerCropMaximum property to show
* that we support its use, however, initialise it to zero because
* it's not meaningful until a camera mode has been chosen.
@@ -1644,6 +1659,25 @@ void RPiCameraData::statsMetadataComplete(uint32_t bufferId, const ControlList &
Request *request = requestQueue_.front();
request->metadata().merge(controls);
+ /*
+ * Inform the sensor of the latest colour gains if it has the
+ * V4L2_CID_NOTIFY_GAINS control (which means notifyGainsUnity_ is set).
+ */
+ if (notifyGainsUnity_ && controls.contains(libcamera::controls::ColourGains)) {
+ libcamera::Span<const float> colourGains = controls.get(libcamera::controls::ColourGains);
+ /* The control wants linear gains in the order B, Gb, Gr, R. */
+ ControlList ctrls(sensor_->controls());
+ std::array<int32_t, 4> gains{
+ static_cast<int32_t>(colourGains[1] * *notifyGainsUnity_),
+ *notifyGainsUnity_,
+ *notifyGainsUnity_,
+ static_cast<int32_t>(colourGains[0] * *notifyGainsUnity_)
+ };
+ ctrls.set(V4L2_CID_NOTIFY_GAINS, Span<const int32_t>{ gains });
+
+ sensor_->setControls(&ctrls);
+ }
+
state_ = State::IpaComplete;
handleState();
}