1 files changed, 102 insertions, 0 deletions
diff --git a/src/py/libcamera/gen-py-controls.py b/src/py/libcamera/gen-py-controls.py
new file mode 100755
index 00000000..4c072e60
--- /dev/null
+++ b/src/py/libcamera/gen-py-controls.py
@@ -0,0 +1,102 @@
+#!/usr/bin/env python3
+# SPDX-License-Identifier: GPL-2.0-or-later
+#
+# Generate Python bindings controls from YAML
+
+import argparse
+import string
+import sys
+import yaml
+
+
+def find_common_prefix(strings):
+    prefix = strings[0]
+
+    for string in strings[1:]:
+        while string[:len(prefix)] != prefix and prefix:
+            prefix = prefix[:len(prefix) - 1]
+        if not prefix:
+            break
+
+    return prefix
+
+
+def generate_py(controls):
+    out = ''
+
+    for ctrl in controls:
+        name, ctrl = ctrl.popitem()
+
+        if ctrl.get('draft'):
+            ns = 'libcamera::controls::draft::'
+            container = 'draft'
+        else:
+            ns = 'libcamera::controls::'
+            container = 'controls'
+
+        out += f'\t{container}.def_readonly_static("{name}", static_cast<const libcamera::ControlId *>(&{ns}{name}));\n\n'
+
+        enum = ctrl.get('enum')
+        if not enum:
+            continue
+
+        cpp_enum = name + 'Enum'
+
+        out += '\tpy::enum_<{}{}>({}, \"{}\")\n'.format(ns, cpp_enum, container, cpp_enum)
+
+        if name == 'LensShadingMapMode':
+            prefix = 'LensShadingMapMode'
+        elif name == 'SceneFlicker':
+            # If we strip the prefix, we would get '50Hz', which is illegal name
+            prefix = ''
+        else:
+            prefix = find_common_prefix([e['name'] for e in enum])
+
+        for entry in enum:
+            cpp_enum = entry['name']
+            py_enum = entry['name'][len(prefix):]
+
+            out += '\t\t.value(\"{}\", {}{})\n'.format(py_enum, ns, cpp_enum)
+
+        out += '\t;\n\n'
+
+    return {'controls': out}
+
+
+def fill_template(template, data):
+    template = open(template, 'rb').read()
+    template = template.decode('utf-8')
+    template = string.Template(template)
+    return template.substitute(data)
+
+
+def main(argv):
+    # Parse command line arguments
+    parser = argparse.ArgumentParser()
+    parser.add_argument('-o', dest='output', metavar='file', type=str,
+                        help='Output file name. Defaults to standard output if not specified.')
+    parser.add_argument('input', type=str,
+                        help='Input file name.')
+    parser.add_argument('template', type=str,
+                        help='Template file name.')
+    args = parser.parse_args(argv[1:])
+
+    data = open(args.input, 'rb').read()
+    controls = yaml.safe_load(data)['controls']
+
+    data = generate_py(controls)
+
+    data = fill_template(args.template, data)
+
+    if args.output:
+        output = open(args.output, 'wb')
+        output.write(data.encode('utf-8'))
+        output.close()
+    else:
+        sys.stdout.write(data)
+
+    return 0
+
+
+if __name__ == '__main__':
+    sys.exit(main(sys.argv))