diff --git a/include/libcamera/internal/isp.h b/include/libcamera/internal/isp.h
new file mode 100644
index 00000000..caab7050
--- /dev/null
+++ b/include/libcamera/internal/isp.h
@@ -0,0 +1,67 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+/*
+ * Copyright (C) 2021, Siyuan Fan <siyuan.fan@foxmail.com>
+ *
+ * isp.h - The software ISP abstract base class
+ */
+#ifndef __LIBCAMERA_INTERNAL_ISP_H__
+#define __LIBCAMERA_INTERNAL_ISP_H__
+
+#include <vector>
+#include <memory>
+#include <tuple>
+
+#include <libcamera/formats.h>
+#include <libcamera/framebuffer.h>
+#include <libcamera/geometry.h>
+#include <libcamera/pixel_format.h>
+
+#include "libcamera/base/object.h"
+#include "libcamera/base/signal.h"
+
+namespace libcamera{
+
+class ISP : public Object
+{
+public:
+        ISP() {}
+
+        virtual ~ISP() {}
+
+        template<class F, class...Ts, std::size_t...Is>
+        void for_each_in_tuple(const std::tuple<Ts...> & tuple, F func, std::index_sequence<Is...>) {
+   
+                return (void(func(std::get<Is>(tuple))), ...);
+        }
+
+        template<class F, class...Ts>
+        void for_each_in_tuple(const std::tuple<Ts...> & tuple, F func) {
+                for_each_in_tuple(tuple, func, std::make_index_sequence<sizeof...(Ts)>());
+        }
+
+        template<typename T, typename... Args>
+        void parse(const T &head, const Args &... rest)
+        {
+                for_each_in_tuple(head, [&](const auto &x) {
+                        // parse parameters for diff algorithm
+                });
+        }
+
+        virtual int configure(PixelFormat inputFormat, PixelFormat outputFormat, Size inputSize, Size outputSize) = 0;
+
+        virtual void processing(FrameBuffer *srcBuffer, FrameBuffer *dstBuffer,
+                                int width, int height) = 0;
+
+        virtual int exportBuffers(std::vector<std::unique_ptr<FrameBuffer>> *buffers,
+                                  unsigned int count, int width, int height) = 0;
+
+        virtual void start() = 0;
+
+        virtual void stop() = 0;
+
+        Signal<FrameBuffer *, FrameBuffer *> ispCompleted;
+};
+
+} /* namespace libcamera */
+
+#endif /* __LIBCAMERA_INTERNAL_ISP_H__ */