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# ========================================================================== #
# #
# KVMD - The main PiKVM daemon. #
# #
# Copyright (C) 2018-2022 Maxim Devaev <[email protected]> #
# #
# This program is free software: you can redistribute it and/or modify #
# it under the terms of the GNU General Public License as published by #
# the Free Software Foundation, either version 3 of the License, or #
# (at your option) any later version. #
# #
# This program is distributed in the hope that it will be useful, #
# but WITHOUT ANY WARRANTY; without even the implied warranty of #
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the #
# GNU General Public License for more details. #
# #
# You should have received a copy of the GNU General Public License #
# along with this program. If not, see <https://www.gnu.org/licenses/>. #
# #
# ========================================================================== #
import sys
import re
import argparse
from typing import List
from typing import Optional
from ...validators.basic import valid_bool
from .. import init
# =====
class _Edid:
def __init__(self, path: str) -> None:
with open(path) as file:
self.__load_from_hex(file.read())
def write(self, path: str) -> None:
self.__update_checksums()
text = "\n".join(
"".join(
f"{item:0{2}X}"
for item in self.__data[index:index + 16]
)
for index in range(0, len(self.__data), 16)
)
if path:
with open(path, "w") as file:
file.write(text + "\n")
else:
print(text)
def is_audio_enabled(self) -> bool:
return bool(self.__data[131] & 0b01000000)
def set_audio_enabled(self, enabled: bool) -> None:
if enabled:
self.__data[131] |= 0b01000000
else:
self.__data[131] &= (0xFF - 0b01000000) # ~X
def __load_from_hex(self, text: str) -> None:
text = re.sub(r"\s", "", text)
self.__data = [
int(text[index:index + 2], 16)
for index in range(0, len(text), 2)
]
assert len(self.__data) == 256, f"Invalid EDID length: {len(self.__data)}, should be 256 bytes"
assert self.__data[126] == 1, "Zero extensions number"
assert (self.__data[128], self.__data[129]) == (0x02, 0x03), "Can't find CEA-861"
def __update_checksums(self) -> None:
self.__data[127] = 256 - (sum(self.__data[:127]) % 256)
self.__data[255] = 256 - (sum(self.__data[128:255]) % 256)
# =====
def main(argv: Optional[List[str]]=None) -> None:
(parent_parser, argv, _) = init(
add_help=False,
argv=argv,
)
parser = argparse.ArgumentParser(
prog="kvmd-edidconf",
description="A simple and primitive KVMD EDID editor",
parents=[parent_parser],
)
parser.add_argument("-f", "--edid-file", dest="path", default="/etc/kvmd/tc358743-edid.hex",
help="EDID hex text file path", metavar="<file>")
parser.add_argument("--stdout", action="store_true",
help="Write to stdout instead of the rewriting the source file")
parser.add_argument("--set-audio", type=valid_bool, dest="set_audio", default=None,
help="Enable or disable basic audio", metavar="<yes|no>")
parser.add_argument("--show-info", action="store_true",
help="Write summary info to stderr")
options = parser.parse_args(argv[1:])
edid = _Edid(options.path)
changed = False
if options.set_audio is not None:
edid.set_audio_enabled(options.set_audio)
changed = True
if changed:
edid.write("" if options.stdout else options.path)
if options.show_info:
print(f"Audio: {'yes' if edid.is_audio_enabled() else 'no'}", file=sys.stderr)
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