ipa: Switch to the plain C API

Switch IPA communication to the plain C API. As the IPAInterface class
is easier to use for pipeline handlers than a plain C API, retain it and
add an IPAContextWrapper that translate between the C++ and the C APIs.

On the IPA module side usage of IPAInterface may be desired for IPAs
implemented in C++ that want to link to libcamera. For those IPAs, a new
IPAInterfaceWrapper helper class is introduced to wrap the IPAInterface
implemented internally by the IPA module into an ipa_context,
ipa_context_ops and ipa_callback_ops.

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

1 files changed, 56 insertions, 0 deletions

diff --git a/src/ipa/libipa/ipa_interface_wrapper.h b/src/ipa/libipa/ipa_interface_wrapper.h
new file mode 100644
index 00000000..17be2062
--- /dev/null
+++ b/src/ipa/libipa/ipa_interface_wrapper.h
@@ -0,0 +1,56 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+/*
+ * Copyright (C) 2019, Google Inc.
+ *
+ * ipa_interface_wrapper.h - Image Processing Algorithm interface wrapper
+ */
+#ifndef __LIBCAMERA_IPA_INTERFACE_WRAPPER_H__
+#define __LIBCAMERA_IPA_INTERFACE_WRAPPER_H__
+
+#include <memory>
+
+#include <ipa/ipa_interface.h>
+
+#include "control_serializer.h"
+
+namespace libcamera {
+
+class IPAInterfaceWrapper : public ipa_context
+{
+public:
+	IPAInterfaceWrapper(std::unique_ptr<IPAInterface> interface);
+
+private:
+	static void destroy(struct ipa_context *ctx);
+	static void init(struct ipa_context *ctx);
+	static void register_callbacks(struct ipa_context *ctx,
+				       const struct ipa_callback_ops *callbacks,
+				       void *cb_ctx);
+	static void configure(struct ipa_context *ctx,
+			      const struct ipa_stream *streams,
+			      unsigned int num_streams,
+			      const struct ipa_control_info_map *maps,
+			      unsigned int num_maps);
+	static void map_buffers(struct ipa_context *ctx,
+				const struct ipa_buffer *c_buffers,
+				size_t num_buffers);
+	static void unmap_buffers(struct ipa_context *ctx,
+				  const unsigned int *ids,
+				  size_t num_buffers);
+	static void process_event(struct ipa_context *ctx,
+				  const struct ipa_operation_data *data);
+
+	static const struct ipa_context_ops operations_;
+
+	void queueFrameAction(unsigned int frame, const IPAOperationData &data);
+
+	std::unique_ptr<IPAInterface> ipa_;
+	const struct ipa_callback_ops *callbacks_;
+	void *cb_ctx_;
+
+	ControlSerializer serializer_;
+};
+
+} /* namespace libcamera */
+
+#endif /* __LIBCAMERA_IPA_INTERFACE_WRAPPER_H__ */