27cece6653
This commit implements gstreamer controls for the libcamera element by generating the controls from the control_ids_*.yaml files using a new gen-gst-controls.py script. The appropriate meson files are also changed to automatically run the script when building. The gen-gst-controls.py script works similar to the gen-controls.py script by parsing the control_ids_*.yaml files and generating C++ code for each exposed control. For the controls to be used as gstreamer properties the type for each control needs to be translated to the appropriate glib type and a GEnumValue is generated for each enum control. Then a g_object_install_property(), _get_property() and _set_property() function is generated for each control. The vendor controls get prefixed with "$vendor-" in the final gstreamer property name. The C++ code generated by the gen-gst-controls.py script is written into the template gstlibcamerasrc-controls.cpp.in file. The matching gstlibcamerasrc-controls.h header defines the GstCameraControls class which handles the installation of the gstreamer properties as well as keeping track of the control values and setting and getting the controls. The content of these functions is generated in the Python script. Finally the libcamerasrc element itself is edited to make use of the new GstCameraControls class. The way this works is by defining a PROP_LAST enum variant which is passed to the installProperties() function so the properties are defined with the appropriate offset. When getting or setting a property PROP_LAST is subtracted from the requested property to translate the control back into a libcamera::controls:: enum variant. Signed-off-by: Jaslo Ziska <jaslo@ziska.de> Reviewed-by: Nicolas Dufresne <nicolas.dufresne@collabora.com> Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
70 lines
2.5 KiB
Meson
70 lines
2.5 KiB
Meson
# SPDX-License-Identifier: CC0-1.0
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glib_dep = dependency('glib-2.0', required : get_option('gstreamer'))
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gst_dep_version = '>=1.14.0'
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gstvideo_dep = dependency('gstreamer-video-1.0', version : gst_dep_version,
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required : get_option('gstreamer'))
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gstallocator_dep = dependency('gstreamer-allocators-1.0', version : gst_dep_version,
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required : get_option('gstreamer'))
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if not glib_dep.found() or not gstvideo_dep.found() or not gstallocator_dep.found()
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gst_enabled = false
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subdir_done()
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endif
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gst_enabled = true
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libcamera_gst_sources = [
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'gstlibcamera-utils.cpp',
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'gstlibcamera.cpp',
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'gstlibcameraallocator.cpp',
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'gstlibcamerapad.cpp',
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'gstlibcamerapool.cpp',
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'gstlibcameraprovider.cpp',
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'gstlibcamerasrc.cpp',
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]
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# Generate gstreamer control properties
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gen_gst_controls_template = files('gstlibcamera-controls.cpp.in')
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libcamera_gst_sources += custom_target('gstlibcamera-controls.cpp',
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input : controls_files,
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output : 'gstlibcamera-controls.cpp',
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command : [gen_gst_controls, '-o', '@OUTPUT@',
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'-t', gen_gst_controls_template, '@INPUT@'],
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env : py_build_env)
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libcamera_gst_cpp_args = [
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'-DVERSION="@0@"'.format(libcamera_git_version),
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'-DPACKAGE="@0@"'.format(meson.project_name()),
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'-DGLIB_VERSION_MIN_REQUIRED=GLIB_VERSION_2_40',
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]
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# The G_DECLARE_FINAL_TYPE macro creates static inline functions that were
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# not marked as possibly unused prior to GLib v2.63.0. This causes clang to
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# complain about the ones we are not using. Silence the -Wunused-function
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# warning in that case.
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if cc.get_id() == 'clang' and glib_dep.version().version_compare('<2.63.0')
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libcamera_gst_cpp_args += ['-Wno-unused-function']
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endif
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libcamera_gst = shared_library('gstlibcamera',
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libcamera_gst_sources,
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cpp_args : libcamera_gst_cpp_args,
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dependencies : [libcamera_public, gstvideo_dep, gstallocator_dep],
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install : true,
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install_dir : '@0@/gstreamer-1.0'.format(get_option('libdir')),
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)
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# Make the plugin visible to GStreamer inside meson devenv.
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fs = import('fs')
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gst_plugin_path = fs.parent(libcamera_gst.full_path())
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gst_env = environment()
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gst_env.prepend('GST_PLUGIN_PATH', gst_plugin_path)
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# Avoid polluting the system registry.
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gst_env.set('GST_REGISTRY', gst_plugin_path / 'registry.data')
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meson.add_devenv(gst_env)
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