libcamera: ipa: Raspberry Pi IPA

Initial implementation of the Raspberry Pi (BCM2835) libcamera IPA and
associated libraries.

All code is licensed under the BSD-2-Clause terms.
Copyright (c) 2019-2020 Raspberry Pi Trading Ltd.

Signed-off-by: Naushir Patuck <naush@raspberrypi.com>
Acked-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

src/ipa/raspberrypi/md_parser_rpi.cpp

@@ -0,0 +1,37 @@
+/* SPDX-License-Identifier: BSD-2-Clause */
+/*
+ * Copyright (C) 2020, Raspberry Pi (Trading) Limited
+ *
+ * md_parser_rpi.cpp - Metadata parser for generic Raspberry Pi metadata
+ */
+
+#include <string.h>
+
+#include "md_parser_rpi.hpp"
+
+using namespace RPi;
+
+MdParserRPi::MdParserRPi()
+{
+}
+
+MdParser::Status MdParserRPi::Parse(void *data)
+{
+	if (buffer_size_bytes_ < sizeof(rpiMetadata))
+		return ERROR;
+
+	memcpy(&metadata, data, sizeof(rpiMetadata));
+	return OK;
+}
+
+MdParser::Status MdParserRPi::GetExposureLines(unsigned int &lines)
+{
+	lines = metadata.exposure;
+	return OK;
+}
+
+MdParser::Status MdParserRPi::GetGainCode(unsigned int &gain_code)
+{
+	gain_code = metadata.gain;
+	return OK;
+}