[libcamera-devel] [PATCH 2/5] libcamera: ipu3: Register FrameDurations control

[Jacopo Mondi]

Register the FrameDurations control in the IPU3 pipeline handler
computed using the vertical blanking limits and the current
configuration pixel rate as parameters.

The FrameDurations control limits should be updated everytime a new
configuration is applied to the sensor.

Signed-off-by: Jacopo Mondi <jacopo at jmondi.org>
---
 src/libcamera/pipeline/ipu3/ipu3.cpp | 35 +++++++++++++++++++++++++++-
 1 file changed, 34 insertions(+), 1 deletion(-)

diff --git a/src/libcamera/pipeline/ipu3/ipu3.cpp b/src/libcamera/pipeline/ipu3/ipu3.cpp
index 329b9d51cf1b..50b03008c0fb 100644
--- a/src/libcamera/pipeline/ipu3/ipu3.cpp
+++ b/src/libcamera/pipeline/ipu3/ipu3.cpp
@@ -754,6 +754,7 @@ int PipelineHandlerIPU3::initControls(IPU3CameraData *data)
 		return ret;
 
 	ControlInfoMap::Map controls = IPU3Controls;
+	const ControlInfoMap &sensorControls = sensor->controls();
 
 	/*
 	 * Compute exposure time limits.
@@ -766,7 +767,6 @@ int PipelineHandlerIPU3::initControls(IPU3CameraData *data)
 	 */
 	double lineDuration = sensorInfo.lineLength
 			    / (sensorInfo.pixelRate / 1e6f);
-	const ControlInfoMap &sensorControls = sensor->controls();
 	const ControlInfo &v4l2Exposure = sensorControls.find(V4L2_CID_EXPOSURE)->second;
 	int32_t minExposure = v4l2Exposure.min().get<int32_t>() * lineDuration;
 	int32_t maxExposure = v4l2Exposure.max().get<int32_t>() * lineDuration;
@@ -781,6 +781,39 @@ int PipelineHandlerIPU3::initControls(IPU3CameraData *data)
 	controls[&controls::ExposureTime] = ControlInfo(minExposure, maxExposure,
 							defExposure);
 
+	/*
+	 * Compute the frame duration limits.
+	 *
+	 * \todo The frame duration limits depend on the sensor configuration.
+	 * Initialize the control using the frame sizes and pixel rate of the
+	 * current configuration.
+	 *
+	 * The frame length is computed assuming a fixed line length combined
+	 * with the vertical frame sizes.
+	 */
+	const ControlInfo &v4l2HBlank = sensorControls.find(V4L2_CID_HBLANK)->second;
+	uint32_t hblank = v4l2HBlank.def().get<int32_t>();
+	uint32_t lineLength = sensorInfo.outputSize.width + hblank;
+
+	const ControlInfo &v4l2VBlank = sensorControls.find(V4L2_CID_VBLANK)->second;
+	std::array<uint32_t, 3> frameHeights{
+		(v4l2VBlank.min().get<int32_t>() + sensorInfo.outputSize.height),
+		(v4l2VBlank.max().get<int32_t>() + sensorInfo.outputSize.height),
+		(v4l2VBlank.def().get<int32_t>() + sensorInfo.outputSize.height),
+	};
+
+	std::vector<int64_t> frameDurations;
+	frameDurations.reserve(3);
+	std::transform(frameHeights.begin(), frameHeights.end(),
+		       std::back_inserter(frameDurations),
+		       [&](int32_t frameHeight) {
+			       int64_t frameSize = lineLength * frameHeight;
+			       return frameSize / (sensorInfo.pixelRate / 1000000U);
+		       });
+	controls[&controls::FrameDurations] = ControlInfo(frameDurations[0],
+							  frameDurations[1],
+							  frameDurations[2]);
+
 	/*
 	 * Compute the scaler crop limits.
 	 *
-- 
2.29.2