[libcamera-devel] [RFC 6/6] libcamera: ipu3: Report pipeline depth

[Jacopo Mondi]

Report for each request the pipeline depth describing the number of
processing steps the frames went into.

This change shows a limitation in the current implementation as the
number of processing steps a frame has been run through is a property
of each Stream. Currently we report the maximum depth among all the
returned frames.

Signed-off-by: Jacopo Mondi <jacopo at jmondi.org>
---
 src/libcamera/pipeline/ipu3/ipu3.cpp | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/src/libcamera/pipeline/ipu3/ipu3.cpp b/src/libcamera/pipeline/ipu3/ipu3.cpp
index 9ce329a83f5d..26ea26430f8e 100644
--- a/src/libcamera/pipeline/ipu3/ipu3.cpp
+++ b/src/libcamera/pipeline/ipu3/ipu3.cpp
@@ -12,6 +12,7 @@
 #include <vector>
 
 #include <libcamera/camera.h>
+#include <libcamera/control_ids.h>
 #include <libcamera/formats.h>
 #include <libcamera/property_ids.h>
 #include <libcamera/request.h>
@@ -41,6 +42,10 @@ static constexpr unsigned int IMGU_OUTPUT_HEIGHT_ALIGN = 4;
 static constexpr unsigned int IMGU_OUTPUT_WIDTH_MARGIN = 64;
 static constexpr unsigned int IMGU_OUTPUT_HEIGHT_MARGIN = 32;
 
+static const ControlInfoMap IPU3Controls = {
+	{ &controls::DraftPipelineDepth, ControlInfo(2, 3) }
+};
+
 class IPU3CameraData : public CameraData
 {
 public:
@@ -786,6 +791,8 @@ int PipelineHandlerIPU3::registerCameras()
 		data->properties_.set(properties::DraftAvailableColorCorrectionAberrationModes,
 				      { static_cast<int32_t>(properties::DRAFT_COLOR_CORRECTION_ABERRATION_OFF) });
 
+		data->controlInfo_ = IPU3Controls;
+
 		/**
 		 * \todo Dynamically assign ImgU and output devices to each
 		 * stream and camera; as of now, limit support to two cameras
@@ -848,6 +855,7 @@ void IPU3CameraData::imguOutputBufferReady(FrameBuffer *buffer)
 		return;
 
 	/* Mark the request as complete. */
+	request->controls().set(controls::DraftPipelineDepth, 3);
 	pipe_->completeRequest(camera_, request);
 }
 
@@ -873,6 +881,7 @@ void IPU3CameraData::cio2BufferReady(FrameBuffer *buffer)
 	if (request->findBuffer(&rawStream_)) {
 		bool isComplete = pipe_->completeBuffer(camera_, request, buffer);
 		if (isComplete) {
+			request->controls().set(controls::DraftPipelineDepth, 2);
 			pipe_->completeRequest(camera_, request);
 			return;
 		}
-- 
2.28.0