utils: raspberrypi: Add tuning file conversion script

Add a script to convert the Raspberry Pi camera tuning file format from version
1.0 to 2.0. This script also adds a root level version key set to 2.0 to the
config file, allowing the controller to distinguish between the two formats.

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

utils/raspberrypi/ctt/convert_tuning.py

@@ -0,0 +1,46 @@
+#!/usr/bin/env python3
+#
+# SPDX-License-Identifier: BSD-2-Clause
+#
+# Script to convert version 1.0 Raspberry Pi camera tuning files to version 2.0.
+#
+# Copyright 2022 Raspberry Pi Ltd
+
+import argparse
+import json
+import sys
+
+from ctt_pretty_print_json import pretty_print
+
+
+def convert_v2(in_json: dict) -> str:
+
+    if 'version' in in_json.keys() and in_json['version'] != 1.0:
+        print(f'The JSON config reports version {in_json["version"]} that is incompatible with this tool.')
+        sys.exit(-1)
+
+    converted = {
+        'version': 2.0,
+        'target': 'bcm2835',
+        'algorithms': [{algo: config} for algo, config in in_json.items()]
+    }
+
+    return pretty_print(converted)
+
+
+if __name__ == "__main__":
+    parser = argparse.ArgumentParser(formatter_class=argparse.RawTextHelpFormatter, description=
+                    'Convert the format of the Raspberry Pi camera tuning file from v1.0 to v2.0.\n')
+    parser.add_argument('input', type=str, help='Input tuning file.')
+    parser.add_argument('output', type=str, nargs='?',
+                        help='Output converted tuning file. If not provided, the input file will be updated in-place.',
+                        default=None)
+    args = parser.parse_args()
+
+    with open(args.input, 'r') as f:
+        in_json = json.load(f)
+
+    out_json = convert_v2(in_json)
+
+    with open(args.output if args.output is not None else args.input, 'w') as f:
+        f.write(out_json)