diff --git a/include/libcamera/internal/mapped_framebuffer.h b/include/libcamera/internal/mapped_framebuffer.h
index 75ac2c8f..9a5355c7 100644
--- a/include/libcamera/internal/mapped_framebuffer.h
+++ b/include/libcamera/internal/mapped_framebuffer.h
@@ -55,6 +55,7 @@ public:
 	using MapFlags = Flags<MapFlag>;
 
 	MappedFrameBuffer(const FrameBuffer *buffer, MapFlags flags);
+	int getPlaneFD(int plane);
 
 private:
 	const FrameBuffer *buffer_;
diff --git a/src/libcamera/mapped_framebuffer.cpp b/src/libcamera/mapped_framebuffer.cpp
index f5ee770c..d5f347d4 100644
--- a/src/libcamera/mapped_framebuffer.cpp
+++ b/src/libcamera/mapped_framebuffer.cpp
@@ -242,4 +242,9 @@ MappedFrameBuffer::MappedFrameBuffer(const FrameBuffer *buffer, MapFlags flags)
 	buffer_ = buffer;
 }
 
+int MappedFrameBuffer::getPlaneFD(int plane)
+{
+	return buffer_->planes()[plane].fd.get();
+}
+
 } /* namespace libcamera */