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/ipu3/algorithms/af.cpp

@@ -409,6 +409,7 @@ bool Af::afIsOutOfFocus(IPAContext &context)
  * \param[in] frame The frame context sequence number
  * \param[in] frameContext The current frame context
  * \param[in] stats The statistics buffer of IPU3
+ * \param[out] metadata Metadata for the frame, to be filled by the algorithm
  *
  * Ideally, a clear image also has a relatively higher contrast. So, every
  * image for each focus step should be tested to find an optimal focus step.
@@ -423,7 +424,8 @@ bool Af::afIsOutOfFocus(IPAContext &context)
  */
 void Af::process(IPAContext &context, [[maybe_unused]] const uint32_t frame,
 		 [[maybe_unused]] IPAFrameContext &frameContext,
-		 const ipu3_uapi_stats_3a *stats)
+		 const ipu3_uapi_stats_3a *stats,
+		 [[maybe_unused]] ControlList &metadata)
 {
 	/* Evaluate the AF buffer length */
 	uint32_t afRawBufferLen = context.configuration.af.afGrid.width *

src/ipa/ipu3/algorithms/af.h

@@ -36,7 +36,8 @@ public:
 		     ipu3_uapi_params *params) override;
 	void process(IPAContext &context, const uint32_t frame,
 		     IPAFrameContext &frameContext,
-		     const ipu3_uapi_stats_3a *stats) override;
+		     const ipu3_uapi_stats_3a *stats,
+		     ControlList &metadata) override;
 
 private:
 	void afCoarseScan(IPAContext &context);

src/ipa/ipu3/algorithms/agc.cpp

@@ -320,13 +320,15 @@ double Agc::estimateLuminance(IPAActiveState &activeState,
  * \param[in] frame The current frame sequence number
  * \param[in] frameContext The current frame context
  * \param[in] stats The IPU3 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 ipu3_uapi_stats_3a *stats)
+		  const ipu3_uapi_stats_3a *stats,
+		  [[maybe_unused]] ControlList &metadata)
 {
 	/*
 	 * Estimate the gain needed to have the proportion of pixels in a given

src/ipa/ipu3/algorithms/agc.h

@@ -30,7 +30,8 @@ public:
 	int configure(IPAContext &context, const IPAConfigInfo &configInfo) override;
 	void process(IPAContext &context, const uint32_t frame,
 		     IPAFrameContext &frameContext,
-		     const ipu3_uapi_stats_3a *stats) override;
+		     const ipu3_uapi_stats_3a *stats,
+		     ControlList &metadata) override;
 
 private:
 	double measureBrightness(const ipu3_uapi_stats_3a *stats,

src/ipa/ipu3/algorithms/awb.cpp

@@ -389,7 +389,8 @@ void Awb::calculateWBGains(const ipu3_uapi_stats_3a *stats)
  */
 void Awb::process(IPAContext &context, [[maybe_unused]] const uint32_t frame,
 		  [[maybe_unused]] IPAFrameContext &frameContext,
-		  const ipu3_uapi_stats_3a *stats)
+		  const ipu3_uapi_stats_3a *stats,
+		  [[maybe_unused]] ControlList &metadata)
 {
 	calculateWBGains(stats);
 

src/ipa/ipu3/algorithms/awb.h

@@ -44,7 +44,8 @@ public:
 		     ipu3_uapi_params *params) override;
 	void process(IPAContext &context, const uint32_t frame,
 		     IPAFrameContext &frameContext,
-		     const ipu3_uapi_stats_3a *stats) override;
+		     const ipu3_uapi_stats_3a *stats,
+		     ControlList &metadata) override;
 
 private:
 	/* \todo Make these structs available to all the ISPs ? */

src/ipa/ipu3/algorithms/tone_mapping.cpp

@@ -79,13 +79,15 @@ void ToneMapping::prepare([[maybe_unused]] IPAContext &context,
  * \param[in] frame The current frame sequence number
  * \param[in] frameContext The current frame context
  * \param[in] stats The IPU3 statistics and ISP results
+ * \param[out] metadata Metadata for the frame, to be filled by the algorithm
  *
  * The tone mapping look up table is generated as an inverse power curve from
  * our gamma setting.
  */
 void ToneMapping::process(IPAContext &context, [[maybe_unused]] const uint32_t frame,
 			  [[maybe_unused]] IPAFrameContext &frameContext,
-			  [[maybe_unused]] const ipu3_uapi_stats_3a *stats)
+			  [[maybe_unused]] const ipu3_uapi_stats_3a *stats,
+			  [[maybe_unused]] ControlList &metadata)
 {
 	/*
 	 * Hardcode gamma to 1.1 as a default for now.

src/ipa/ipu3/algorithms/tone_mapping.h

@@ -23,7 +23,8 @@ public:
 		     IPAFrameContext &frameContext, ipu3_uapi_params *params) override;
 	void process(IPAContext &context, const uint32_t frame,
 		     IPAFrameContext &frameContext,
-		     const ipu3_uapi_stats_3a *stats) override;
+		     const ipu3_uapi_stats_3a *stats,
+		     ControlList &metadata) override;
 
 private:
 	double gamma_;