ipa: Pass metadata to Algorithm::process() function

Extend the Algorithm::process() function with a metadata control list,
to be filled by individual algorithms with frame metadata. Update the
rkisp1 and ipu3 IPA modules accordingly, and drop the dead code in the
IPARkISP1::prepareMetadata() function while at it.

This only creates the infrastructure, filling metadata in individual
algorithms will be handled separately.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Reviewed-by: Jacopo Mondi <jacopo@jmondi.org>

src/ipa/rkisp1/algorithms/agc.cpp

@@ -283,12 +283,14 @@ double Agc::measureBrightness(const rkisp1_cif_isp_hist_stat *hist) const
  * \param[in] frame The frame context sequence number
  * \param[in] frameContext The current frame context
  * \param[in] stats The RKISP1 statistics and ISP results
+ * \param[out] metadata Metadata for the frame, to be filled by the algorithm
  *
  * Identify the current image brightness, and use that to estimate the optimal
  * new exposure and gain for the scene.
  */
 void Agc::process(IPAContext &context, [[maybe_unused]] const uint32_t frame,
-		  IPAFrameContext &frameContext, const rkisp1_stat_buffer *stats)
+		  IPAFrameContext &frameContext, const rkisp1_stat_buffer *stats,
+		  [[maybe_unused]] ControlList &metadata)
 {
 	/*
 	 * \todo Verify that the exposure and gain applied by the sensor for

src/ipa/rkisp1/algorithms/agc.h

@@ -31,7 +31,8 @@ public:
 		     rkisp1_params_cfg *params) override;
 	void process(IPAContext &context, const uint32_t frame,
 		     IPAFrameContext &frameContext,
-		     const rkisp1_stat_buffer *stats) override;
+		     const rkisp1_stat_buffer *stats,
+		     ControlList &metadata) override;
 
 private:
 	void computeExposure(IPAContext &Context, IPAFrameContext &frameContext,

src/ipa/rkisp1/algorithms/awb.cpp

@@ -208,7 +208,8 @@ void Awb::queueRequest(IPAContext &context,
 void Awb::process(IPAContext &context,
 		  [[maybe_unused]] const uint32_t frame,
 		  IPAFrameContext &frameContext,
-		  const rkisp1_stat_buffer *stats)
+		  const rkisp1_stat_buffer *stats,
+		  [[maybe_unused]] ControlList &metadata)
 {
 	const rkisp1_cif_isp_stat *params = &stats->params;
 	const rkisp1_cif_isp_awb_stat *awb = &params->awb;

src/ipa/rkisp1/algorithms/awb.h

@@ -27,8 +27,9 @@ public:
 			  IPAFrameContext &frameContext,
 			  const ControlList &controls) override;
 	void process(IPAContext &context, const uint32_t frame,
-		     IPAFrameContext &frameCtx,
-		     const rkisp1_stat_buffer *stats) override;
+		     IPAFrameContext &frameContext,
+		     const rkisp1_stat_buffer *stats,
+		     ControlList &metadata) override;
 
 private:
 	uint32_t estimateCCT(double red, double green, double blue);