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##
## This file is part of the libsigrokdecode project.
##
## Copyright (C) 2019 Rene Staffen
##
## 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 2 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 <http://www.gnu.org/licenses/>.
##
'''
Python binding for the IRMP library.
'''
import ctypes
import platform
class IrmpLibrary:
'''
Library instance for an infrared protocol detector.
'''
__usable_instance = None
class ResultData(ctypes.Structure):
_fields_ = [
( 'protocol', ctypes.c_uint32, ),
( 'protocol_name', ctypes.c_char_p, ),
( 'address', ctypes.c_uint32, ),
( 'command', ctypes.c_uint32, ),
( 'flags', ctypes.c_uint32, ),
( 'start_sample', ctypes.c_uint32, ),
( 'end_sample', ctypes.c_uint32, ),
]
FLAG_REPETITION = 1 << 0
FLAG_RELEASE = 1 << 1
def _library_filename(self):
'''
Determine the library filename depending on the platform.
'''
if platform.uname()[0] == 'Linux':
return 'libirmp.so'
if platform.uname()[0] == 'Darwin':
return 'libirmp.dylib'
return 'irmp.dll'
def _library_setup_api(self):
'''
Lookup the C library's API routines. Declare their prototypes.
'''
if not self._lib:
return False
self._lib.irmp_get_sample_rate.restype = ctypes.c_uint32
self._lib.irmp_get_sample_rate.argtypes = []
self._lib.irmp_reset_state.restype = None
self._lib.irmp_reset_state.argtypes = []
self._lib.irmp_add_one_sample.restype = ctypes.c_int
self._lib.irmp_add_one_sample.argtypes = [ ctypes.c_int, ]
if False:
self._lib.irmp_detect_buffer.restype = self.ResultData
self._lib.irmp_detect_buffer.argtypes = [ ctypes.POINTER(ctypes.c_uint8), ctypes.c_size_t, ]
self._lib.irmp_get_result_data.restype = ctypes.c_int
self._lib.irmp_get_result_data.argtypes = [ ctypes.POINTER(self.ResultData), ]
self._lib.irmp_get_protocol_name.restype = ctypes.c_char_p
self._lib.irmp_get_protocol_name.argtypes = [ ctypes.c_uint32, ]
# Create a result buffer that's local to the library instance.
self._data = self.ResultData()
return True
def __init__(self):
'''
Create a library instance.
'''
# Only create a working instance for the first invocation.
# Degrade all other instances, make them fail "late" during
# execution, so that users will see the errors.
self._lib = None
self._data = None
if IrmpLibrary.__usable_instance is None:
filename = self._library_filename()
self._lib = ctypes.cdll.LoadLibrary(filename)
self._library_setup_api()
IrmpLibrary.__usable_instance = self
def get_sample_rate(self):
if not self._lib:
return None
return self._lib.irmp_get_sample_rate()
def reset_state(self):
if not self._lib:
return None
self._lib.irmp_reset_state()
def add_one_sample(self, level):
if not self._lib:
raise Exception("IRMP library limited to a single instance.")
if not self._lib.irmp_add_one_sample(int(level)):
return False
self._lib.irmp_get_result_data(ctypes.byref(self._data))
return True
def get_result_data(self):
if not self._data:
return None
return {
'proto_nr': self._data.protocol,
'proto_name': self._data.protocol_name.decode('UTF-8', 'ignore'),
'address': self._data.address,
'command': self._data.command,
'repeat': bool(self._data.flags & self.FLAG_REPETITION),
'release': bool(self._data.flags & self.FLAG_RELEASE),
'start': self._data.start_sample,
'end': self._data.end_sample,
}
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