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>
120 lines
3.1 KiB
Python
120 lines
3.1 KiB
Python
#!/usr/bin/env python3
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# SPDX-License-Identifier: GPL-2.0-or-later
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# Copyright (C) 2019, Google Inc.
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#
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# Author: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
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#
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# Helper classes to handle source code generation for libcamera controls
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class ControlEnum(object):
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def __init__(self, data):
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self.__data = data
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@property
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def description(self):
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"""The enum description"""
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return self.__data.get('description')
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@property
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def name(self):
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"""The enum name"""
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return self.__data.get('name')
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@property
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def value(self):
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"""The enum value"""
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return self.__data.get('value')
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class Control(object):
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def __init__(self, name, data, vendor):
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self.__name = name
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self.__data = data
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self.__enum_values = None
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self.__size = None
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self.__vendor = vendor
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enum_values = data.get('enum')
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if enum_values is not None:
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self.__enum_values = [ControlEnum(enum) for enum in enum_values]
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size = self.__data.get('size')
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if size is not None:
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if len(size) == 0:
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raise RuntimeError(f'Control `{self.__name}` size must have at least one dimension')
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# Compute the total number of elements in the array. If any of the
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# array dimension is a string, the array is variable-sized.
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num_elems = 1
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for dim in size:
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if type(dim) is str:
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num_elems = 0
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break
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dim = int(dim)
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if dim <= 0:
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raise RuntimeError(f'Control `{self.__name}` size must have positive values only')
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num_elems *= dim
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self.__size = num_elems
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@property
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def description(self):
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"""The control description"""
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return self.__data.get('description')
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@property
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def enum_values(self):
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"""The enum values, if the control is an enumeration"""
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if self.__enum_values is None:
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return
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for enum in self.__enum_values:
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yield enum
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@property
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def enum_values_count(self):
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"""The number of enum values, if the control is an enumeration"""
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if self.__enum_values is None:
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return 0
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return len(self.__enum_values)
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@property
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def is_enum(self):
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"""Is the control an enumeration"""
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return self.__enum_values is not None
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@property
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def vendor(self):
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"""The vendor string, or None"""
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return self.__vendor
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@property
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def name(self):
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"""The control name (CamelCase)"""
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return self.__name
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@property
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def type(self):
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typ = self.__data.get('type')
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size = self.__data.get('size')
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if typ == 'string':
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return 'std::string'
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if self.__size is None:
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return typ
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if self.__size:
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return f"Span<const {typ}, {self.__size}>"
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else:
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return f"Span<const {typ}>"
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@property
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def element_type(self):
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return self.__data.get('type')
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@property
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def size(self):
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return self.__size
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