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authorLaurent Pinchart <laurent.pinchart@ideasonboard.com>2019-09-29 14:24:09 +0300
committerLaurent Pinchart <laurent.pinchart@ideasonboard.com>2019-10-05 20:02:51 +0300
commit8ea6912c9607dab0a30c9bbf518dfc80df68a10c (patch)
treea5a933b6fc28de84c2087563d9791fb872c52fab
parenta8c40942b99e7e50d43a40c4b0a601c7428b30fd (diff)
libcamera: controls: Auto-generate control_ids.h and control_ids.cpp
Bring back auto-generation of control ids. In this version, both the header and the source files are generated from a single YAML file that stores all control definitions. This allows centralising controls in a single file, while the previous version required keeping both declarations (in a header) and documentation (in a the source) in sync manually. Using YAML as a format to store control definitions is a trade-off between ease of use (there are many YAML parsers available) and simplicity (XML was considered, but would have lead to more complex processing). A new build time dependency is added on python3-yaml, which should be available as a package in all distributions and build environments. The YAML format is likely to change over time as we improve documentation of controls, the first version simply copies the information currently available. Future improvements should also include a YAML schema to validate the YAML source file. Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>
-rw-r--r--Documentation/Doxyfile.in4
-rw-r--r--README.rst2
-rw-r--r--include/libcamera/control_ids.h.in (renamed from include/libcamera/control_ids.h)16
-rwxr-xr-xinclude/libcamera/gen-header.sh2
-rw-r--r--include/libcamera/meson.build18
-rw-r--r--package/gentoo/media-libs/libcamera/libcamera-9999.ebuild9
-rw-r--r--src/libcamera/control_ids.cpp52
-rw-r--r--src/libcamera/control_ids.cpp.in25
-rw-r--r--src/libcamera/control_ids.yaml35
-rwxr-xr-xsrc/libcamera/gen-controls.py114
-rw-r--r--src/libcamera/meson.build12
11 files changed, 215 insertions, 74 deletions
diff --git a/Documentation/Doxyfile.in b/Documentation/Doxyfile.in
index 28a9c2da..5237cf60 100644
--- a/Documentation/Doxyfile.in
+++ b/Documentation/Doxyfile.in
@@ -793,7 +793,9 @@ WARN_LOGFILE =
INPUT = "@TOP_SRCDIR@/include/ipa" \
"@TOP_SRCDIR@/include/libcamera" \
- "@TOP_SRCDIR@/src/libcamera"
+ "@TOP_SRCDIR@/src/libcamera" \
+ "@TOP_BUILDDIR@/include/libcamera" \
+ "@TOP_BUILDDIR@/src/libcamera"
# This tag can be used to specify the character encoding of the source files
# that doxygen parses. Internally doxygen uses the UTF-8 encoding. Doxygen uses
diff --git a/README.rst b/README.rst
index 169837e4..2ccf7cbe 100644
--- a/README.rst
+++ b/README.rst
@@ -40,7 +40,7 @@ A C++ toolchain: [required]
Either {g++, clang}
for libcamera: [required]
- meson ninja-build
+ meson ninja-build python3-yaml
for device hotplug enumeration: [optional]
pkg-config libudev-dev
diff --git a/include/libcamera/control_ids.h b/include/libcamera/control_ids.h.in
index 54235f1a..1d0bc791 100644
--- a/include/libcamera/control_ids.h
+++ b/include/libcamera/control_ids.h.in
@@ -3,6 +3,8 @@
* Copyright (C) 2019, Google Inc.
*
* control_ids.h : Control ID list
+ *
+ * This file is auto-generated. Do not edit.
*/
#ifndef __LIBCAMERA_CONTROL_IDS_H__
@@ -17,20 +19,10 @@ namespace libcamera {
namespace controls {
enum {
- AWB_ENABLE = 1,
- BRIGHTNESS = 2,
- CONTRAST = 3,
- SATURATION = 4,
- MANUAL_EXPOSURE = 5,
- MANUAL_GAIN = 6,
+${ids}
};
-extern const Control<bool> AwbEnable;
-extern const Control<int32_t> Brightness;
-extern const Control<int32_t> Contrast;
-extern const Control<int32_t> Saturation;
-extern const Control<int32_t> ManualExposure;
-extern const Control<int32_t> ManualGain;
+${controls}
} /* namespace controls */
diff --git a/include/libcamera/gen-header.sh b/include/libcamera/gen-header.sh
index a69fe8e9..7f7816c9 100755
--- a/include/libcamera/gen-header.sh
+++ b/include/libcamera/gen-header.sh
@@ -19,7 +19,7 @@ EOF
headers=$(for header in "$src_dir"/*.h ; do
header=$(basename "$header")
echo "$header"
-done ; echo "version.h" | sort)
+done ; echo "control_ids.h" ; echo "version.h" | sort)
for header in $headers ; do
echo "#include <libcamera/$header>" >> "$dst_file"
diff --git a/include/libcamera/meson.build b/include/libcamera/meson.build
index 868f1a6b..4ffbdab3 100644
--- a/include/libcamera/meson.build
+++ b/include/libcamera/meson.build
@@ -3,7 +3,6 @@ libcamera_api = files([
'buffer.h',
'camera.h',
'camera_manager.h',
- 'control_ids.h',
'controls.h',
'event_dispatcher.h',
'event_notifier.h',
@@ -18,6 +17,20 @@ libcamera_api = files([
include_dir = join_paths(libcamera_include_dir, 'libcamera')
+install_headers(libcamera_api,
+ subdir : include_dir)
+
+gen_controls = files('../../src/libcamera/gen-controls.py')
+
+control_ids_h = custom_target('control_ids_h',
+ input : files('../../src/libcamera/control_ids.yaml', 'control_ids.h.in'),
+ output : 'control_ids.h',
+ depend_files : gen_controls,
+ command : [gen_controls, '-o', '@OUTPUT@', '@INPUT@'],
+ install_dir : join_paths('include', include_dir))
+
+libcamera_api += control_ids_h
+
gen_header = files('gen-header.sh')
libcamera_h = custom_target('gen-header',
@@ -37,6 +50,3 @@ configure_file(input : 'version.h.in',
output : 'version.h',
configuration : libcamera_version_config,
install_dir : join_paths('include', include_dir))
-
-install_headers(libcamera_api,
- subdir : include_dir)
diff --git a/package/gentoo/media-libs/libcamera/libcamera-9999.ebuild b/package/gentoo/media-libs/libcamera/libcamera-9999.ebuild
index fed2b409..fc241b1f 100644
--- a/package/gentoo/media-libs/libcamera/libcamera-9999.ebuild
+++ b/package/gentoo/media-libs/libcamera/libcamera-9999.ebuild
@@ -2,7 +2,9 @@
# Distributed under the terms of the GNU General Public License v2
EAPI=6
-inherit git-r3 meson
+PYTHON_COMPAT=( python3_{5,6,7} )
+
+inherit git-r3 meson python-any-r1
DESCRIPTION="Camera support library for Linux"
HOMEPAGE="http://libcamera.org"
@@ -15,7 +17,10 @@ KEYWORDS="*"
IUSE="udev"
RDEPEND="udev? ( virtual/libudev )"
-DEPEND="${RDEPEND}"
+DEPEND="
+ ${RDEPEND}
+ $(python_gen_any_dep 'dev-python/pyyaml[${PYTHON_USEDEP}]')
+"
src_configure() {
local emesonargs=(
diff --git a/src/libcamera/control_ids.cpp b/src/libcamera/control_ids.cpp
deleted file mode 100644
index 3af23a45..00000000
--- a/src/libcamera/control_ids.cpp
+++ /dev/null
@@ -1,52 +0,0 @@
-/* SPDX-License-Identifier: LGPL-2.1-or-later */
-/*
- * Copyright (C) 2019, Google Inc.
- *
- * control_ids.cpp : Control ID list
- */
-
-#include <libcamera/control_ids.h>
-
-/**
- * \file control_ids.h
- * \brief Camera control identifiers
- */
-
-namespace libcamera {
-
-namespace controls {
-
-/**
- * \brief Enables or disables the AWB.
- * \sa ManualGain
- */
-extern const Control<bool> AwbEnable(AWB_ENABLE, "AwbEnable");
-
-/**
- * \brief Specify a fixed brightness parameter.
- */
-extern const Control<int32_t> Brightness(BRIGHTNESS, "Brightness");
-
-/**
- * \brief Specify a fixed contrast parameter.
- */
-extern const Control<int32_t> Contrast(CONTRAST, "Contrast");
-
-/**
- * \brief Specify a fixed saturation parameter.
- */
-extern const Control<int32_t> Saturation(SATURATION, "Saturation");
-
-/**
- * \brief Specify a fixed exposure time in milli-seconds
- */
-extern const Control<int32_t> ManualExposure(MANUAL_EXPOSURE, "ManualExposure");
-
-/**
- * \brief Specify a fixed gain parameter
- */
-extern const Control<int32_t> ManualGain(MANUAL_GAIN, "ManualGain");
-
-} /* namespace controls */
-
-} /* namespace libcamera */
diff --git a/src/libcamera/control_ids.cpp.in b/src/libcamera/control_ids.cpp.in
new file mode 100644
index 00000000..f699ac9e
--- /dev/null
+++ b/src/libcamera/control_ids.cpp.in
@@ -0,0 +1,25 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+/*
+ * Copyright (C) 2019, Google Inc.
+ *
+ * control_ids.cpp : Control ID list
+ *
+ * This file is auto-generated. Do not edit.
+ */
+
+#include <libcamera/control_ids.h>
+
+/**
+ * \file control_ids.h
+ * \brief Camera control identifiers
+ */
+
+namespace libcamera {
+
+namespace controls {
+
+${controls}
+
+} /* namespace controls */
+
+} /* namespace libcamera */
diff --git a/src/libcamera/control_ids.yaml b/src/libcamera/control_ids.yaml
new file mode 100644
index 00000000..819a5967
--- /dev/null
+++ b/src/libcamera/control_ids.yaml
@@ -0,0 +1,35 @@
+# SPDX-License-Identifier: LGPL-2.1-or-later
+#
+# Copyright (C) 2019, Google Inc.
+#
+%YAML 1.2
+---
+controls:
+ - AwbEnable:
+ type: bool
+ description: |
+ Enables or disables the AWB.
+
+ \sa ManualGain
+
+ - Brightness:
+ type: int32_t
+ description: Specify a fixed brightness parameter
+
+ - Contrast:
+ type: int32_t
+ description: Specify a fixed contrast parameter
+
+ - Saturation:
+ type: int32_t
+ description: Specify a fixed saturation parameter
+
+ - ManualExposure:
+ type: int32_t
+ description: Specify a fixed exposure time in milli-seconds
+
+ - ManualGain:
+ type: int32_t
+ description: Specify a fixed gain parameter
+
+...
diff --git a/src/libcamera/gen-controls.py b/src/libcamera/gen-controls.py
new file mode 100755
index 00000000..0899e40b
--- /dev/null
+++ b/src/libcamera/gen-controls.py
@@ -0,0 +1,114 @@
+#!/usr/bin/python3
+# SPDX-License-Identifier: GPL-2.0-or-later
+# Copyright (C) 2019, Google Inc.
+#
+# Author: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
+#
+# gen-controls.py - Generate control definitions from YAML
+
+import argparse
+import string
+import sys
+import yaml
+
+
+def snake_case(s):
+ return ''.join([c.isupper() and ('_' + c) or c for c in s]).strip('_')
+
+
+def generate_cpp(controls):
+ template = string.Template('''/**
+${description}
+ */
+extern const Control<${type}> ${name}(${id_name}, "${name}");''')
+
+ ctrls = []
+
+ for ctrl in controls:
+ name, ctrl = ctrl.popitem()
+ id_name = snake_case(name).upper()
+
+ description = ctrl['description'].strip('\n').split('\n')
+ description[0] = '\\brief ' + description[0]
+ description = '\n'.join([(line and ' * ' or ' *') + line for line in description])
+
+ info = {
+ 'name': name,
+ 'type': ctrl['type'],
+ 'description': description,
+ 'id_name': id_name,
+ }
+
+ ctrls.append(template.substitute(info))
+
+ return {'controls': '\n\n'.join(ctrls)}
+
+
+def generate_h(controls):
+ template = string.Template('''extern const Control<${type}> ${name};''')
+
+ ctrls = []
+ ids = []
+ id_value = 1
+
+ for ctrl in controls:
+ name, ctrl = ctrl.popitem()
+ id_name = snake_case(name).upper()
+
+ ids.append('\t' + id_name + ' = ' + str(id_value) + ',')
+
+ info = {
+ 'name': name,
+ 'type': ctrl['type'],
+ }
+
+ ctrls.append(template.substitute(info))
+ id_value += 1
+
+ return {'ids': '\n'.join(ids), 'controls': '\n'.join(ctrls)}
+
+
+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']
+
+ if args.template.endswith('.cpp.in'):
+ data = generate_cpp(controls)
+ elif args.template.endswith('.h.in'):
+ data = generate_h(controls)
+ else:
+ raise RuntimeError('Unknown template type')
+
+ 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))
diff --git a/src/libcamera/meson.build b/src/libcamera/meson.build
index 8123d1d5..f0795bbd 100644
--- a/src/libcamera/meson.build
+++ b/src/libcamera/meson.build
@@ -5,7 +5,6 @@ libcamera_sources = files([
'camera_manager.cpp',
'camera_sensor.cpp',
'controls.cpp',
- 'control_ids.cpp',
'device_enumerator.cpp',
'device_enumerator_sysfs.cpp',
'event_dispatcher.cpp',
@@ -58,6 +57,17 @@ if libudev.found()
])
endif
+gen_controls = files('gen-controls.py')
+
+control_ids_cpp = custom_target('control_ids_cpp',
+ input : files('control_ids.yaml', 'control_ids.cpp.in'),
+ output : 'control_ids.cpp',
+ depend_files : gen_controls,
+ command : [gen_controls, '-o', '@OUTPUT@', '@INPUT@'])
+
+libcamera_sources += control_ids_cpp
+libcamera_sources += control_ids_h
+
gen_version = join_paths(meson.source_root(), 'utils', 'gen-version.sh')
version_cpp = vcs_tag(command : [gen_version, meson.build_root()],