ipa: Switch to FrameBuffer interface

Switch the IPA interfaces and implementations to use the Framebuffer
interface.

- The IPA interface is switched to use the simpler FrameBuffer::Plane
  container when carrying dmabuf descriptions (fd and length) over the
  pipeline/IPA boundary.

- The RkISP1 IPA implementation takes advantage of the new simpler and
  safer (better control over file descriptors) FrameBuffer interface.

Signed-off-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

src/libcamera/ipa_context_wrapper.cpp

@@ -149,15 +149,15 @@ void IPAContextWrapper::mapBuffers(const std::vector<IPABuffer> &buffers)
 	for (unsigned int i = 0; i < buffers.size(); ++i) {
 		struct ipa_buffer &c_buffer = c_buffers[i];
 		const IPABuffer &buffer = buffers[i];
-		const std::vector<Plane> &planes = buffer.memory.planes();
+		const std::vector<FrameBuffer::Plane> &planes = buffer.planes;
 
 		c_buffer.id = buffer.id;
 		c_buffer.num_planes = planes.size();
 
 		for (unsigned int j = 0; j < planes.size(); ++j) {
-			const Plane &plane = planes[j];
-			c_buffer.planes[j].dmabuf = plane.dmabuf();
-			c_buffer.planes[j].length = plane.length();
+			const FrameBuffer::Plane &plane = planes[j];
+			c_buffer.planes[j].dmabuf = plane.fd.fd();
+			c_buffer.planes[j].length = plane.length;
 		}
 	}
 

src/libcamera/ipa_interface.cpp

@@ -334,11 +334,10 @@ namespace libcamera {
  */
 
 /**
- * \var IPABuffer::memory
- * \brief The buffer memory description
+ * \var IPABuffer::planes
+ * \brief The buffer planes description
  *
- * The memory field stores the dmabuf handle and size for each plane of the
- * buffer.
+ * Stores the dmabuf handle and length for each plane of the buffer.
  */
 
 /**

src/libcamera/pipeline/rkisp1/rkisp1.cpp

@@ -687,14 +687,22 @@ int PipelineHandlerRkISP1::allocateBuffers(Camera *camera,
 	}
 
 	for (unsigned int i = 0; i < stream->configuration().bufferCount + 1; i++) {
+		FrameBuffer::Plane plane;
+		plane.fd = FileDescriptor(paramPool_.buffers()[i].planes()[0].dmabuf());
+		plane.length = paramPool_.buffers()[i].planes()[0].length();
+
 		data->ipaBuffers_.push_back({ .id = RKISP1_PARAM_BASE | i,
-					      .memory = paramPool_.buffers()[i] });
+					      .planes = { plane } });
 		paramBuffers_.push(new Buffer(i));
 	}
 
 	for (unsigned int i = 0; i < stream->configuration().bufferCount + 1; i++) {
+		FrameBuffer::Plane plane;
+		plane.fd = FileDescriptor(statPool_.buffers()[i].planes()[0].dmabuf());
+		plane.length = statPool_.buffers()[i].planes()[0].length();
+
 		data->ipaBuffers_.push_back({ .id = RKISP1_STAT_BASE | i,
-					      .memory = statPool_.buffers()[i] });
+					      .planes = { plane } });
 		statBuffers_.push(new Buffer(i));
 	}