libcamera: ipa_module: add IPA shared library module

Implement a class to wrap around an IPA module shared object.

For now, just load a struct IPAModuleInfo with symbol name
ipaModuleInfo from an IPA module .so shared object.

Also provide a public header file including the struct IPAModuleInfo,
structured such that both C and C++ IPA modules are supported.

Signed-off-by: Paul Elder <paul.elder@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

src/libcamera/include/ipa_module.h

@@ -0,0 +1,36 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+/*
+ * Copyright (C) 2019, Google Inc.
+ *
+ * ipa_module.h - Image Processing Algorithm module
+ */
+#ifndef __LIBCAMERA_IPA_MODULE_H__
+#define __LIBCAMERA_IPA_MODULE_H__
+
+#include <string>
+
+#include <libcamera/ipa/ipa_module_info.h>
+
+namespace libcamera {
+
+class IPAModule
+{
+public:
+	explicit IPAModule(const std::string &libPath);
+
+	bool isValid() const;
+
+	const struct IPAModuleInfo &info() const;
+
+private:
+	struct IPAModuleInfo info_;
+
+	std::string libPath_;
+	bool valid_;
+
+	int loadIPAModuleInfo();
+};
+
+} /* namespace libcamera */
+
+#endif /* __LIBCAMERA_IPA_MODULE_H__ */