The c function has a signature as follows:
int cfun(int len_data, float* data, int* a, int num_a,
int flag1, int flag2, int flag3, float* param,
float* out1, float* out2, float* out3)
and in python:
import numpy as np
import ctypes as ct
data = np.atleast_2d(np.float32(data))
a = np.atleast_2d(np.int32(a)) if a else np.zeros((2, 1), dtype=np.int32)
param = np.atleast_2d(np.float32(param))
num_a = activity.shape[1]
len_data = data.shape[1]
num_inc = len_data//256
cf = ct.POINTER(ct.c_float)
hr = np.zeros((2, num_inc), dtype=np.float32)
of = np.zeros((num_inc, 207), dtype=np.float32)
gait = np.zeros((num_inc, 14), dtype=np.float32)
pt_of = of.ctypes.data_as(cf) if do_of else None
pt_gait = gait.ctypes.data_as(cf) if do_gait else None
pt_param = param.ctypes.data_as(cf) if param else None
dl.run_plt_hrm(len_data, data.ctypes.data_as(cf),
activity.ctypes.data_as(ct.POINTER(ct.c_int)),
num_act, do_long_fft+0, do_cls_mitigate+0, do_weighted_average+0,
pt_param, hr.ctypes.data_as(cf), pt_of, pt_gait)
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