__init__.py
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from ctypes import *
import os
# some notes on ctypes:
# first, you have to make an object that talks directly to the compiled C object
# then, for each function in the C API, the user must define the input/return types
# not setting the argtypes means no args, not setting restypes is void
# there are the normal types, like c_int, c_bool, c_float, c_int_p (char*)
# for char** and *char[], we use POINTER(c_char_p)
# and c_void_p for void*
# these helper functions are just for code reuse -
# they generate common arguments for the C API functions
def _string_args(n):
'''
Returns n char*
'''
return [c_char_p]*n
def _var_string_args_func(func, n, *args):
'''
Translates the C functions that are
(int, char**, n char*, and optional extra types in *args)
to a more pythonic version that wraps the char** arg in
the appropriate type.
'''
def call_func(one, two, *rest):
arr_type = c_char_p*len(two)
func.argtypes = [c_int, arr_type] + _string_args(n) + list(args)
arr = arr_type(*map(c_char_p, two))
return func(one, arr, *rest)
return call_func
def _handle_string_func(func, *moretypes):
'''
A helper function to make the C functions
that populate string buffers more pythonic.
The functions in the C API return an int
(the length of the returned string buffer)
and put the return value in a string buffer.
This function replaces the call to the C obj with two calls -
a) one with empty string to get length
b) one with a string of that length to get the actual value
Then it returns the string itself. This way, the user of brpy
doesn't need to do this stupid magic for themselves. Hooray!
'''
func.argtypes = [c_char_p, c_int] + list(moretypes)
def call_func(*args):
howlong = func('', 0, *args)
msg = 'x'*(howlong-1)
func(msg, howlong, *args)
return msg
return call_func
def init_brpy(br_loc='/usr/local/lib'):
"""Initializes all function inputs and outputs for the br ctypes lib object"""
lib_path = os.environ.get('LD_LIBRARY_PATH')
paths = [br_loc]
if lib_path:
paths.extend(lib_path.split(':'))
found = False
for p in paths:
dylib = '%s/%s.%s' % (p, 'libopenbr', 'dylib')
so = '%s/%s.%s' % (p, 'libopenbr', 'so')
if os.path.exists(dylib):
br = cdll.LoadLibrary(dylib)
found = True
break
elif os.path.exists(so):
br = cdll.LoadLibrary(so)
found = True
break
if not found:
raise ValueError('Neither .so nor .dylib libopenbr found in %s' % br_loc)
br.br_about.restype = c_char_p
br.br_cat = _var_string_args_func(br.br_cat, 1)
br.br_cluster = _var_string_args_func(br.br_cluster, 0, c_float, c_char_p)
br.br_combine_masks = _var_string_args_func(br.br_combine_masks, 2)
br.br_compare.argtypes = _string_args(3)
br.br_compare_n = _var_string_args_func(br.br_compare_n, 2)
br.br_pairwise_compare.argtypes = _string_args(3)
br.br_convert.argtypes = _string_args(3)
br.br_enroll.argtypes = _string_args(2)
br.br_enroll_n = _var_string_args_func(br.br_enroll_n, 1)
br.br_eval.argtypes = _string_args(3)
br.br_eval.restype = c_float
br.br_eval_classification.argtypes = _string_args(4)
br.br_eval_clustering.argtypes = _string_args(3)
br.br_eval_detection.argtypes = _string_args(3)
br.br_eval_detection.restype = c_float
br.br_eval_landmarking.argtypes = _string_args(3) + [c_int, c_int]
br.br_eval_landmarking.restype = c_float
br.br_eval_regression.argtypes = _string_args(4)
br.br_fuse = _var_string_args_func(br.br_fuse, 3)
def br_initialize_wrap(func):
def call_func(argc, argv, sdk_path='', use_gui=False):
arr_type = c_char_p*len(argv)
func.argtypes = [POINTER(c_int),arr_type,c_char_p,c_bool]
arr = arr_type(*map(c_char_p, argv))
return func(pointer(c_int(argc)), arr, sdk_path, use_gui)
return call_func
br.br_initialize = br_initialize_wrap(br.br_initialize)
br.br_is_classifier.argtypes = [c_char_p]
br.br_is_classifier.restype = c_bool
br.br_make_mask.argtypes = _string_args(3)
br.br_make_pairwise_mask.argtypes = _string_args(3)
br.br_most_recent_message.restype = c_int
br.br_most_recent_message = _handle_string_func(br.br_most_recent_message)
br.br_objects.restype = c_int
moreargs = _string_args(2) + [c_bool]
br.br_objects = _handle_string_func(br.br_objects, *moreargs)
br.br_plot.restype = c_bool
br.br_plot = _var_string_args_func(br.br_plot, 1, c_bool)
br.br_plot_detection.restype = c_bool
br.br_plot_detection = _var_string_args_func(br.br_plot_detection, 1, c_bool)
br.br_plot_landmarking.restype = c_bool
br.br_plot_landmarking = _var_string_args_func(br.br_plot_landmarking, 1, c_bool)
br.br_plot_metadata.restype = c_bool
br.br_plot_metadata = _var_string_args_func(br.br_plot_metadata, 1, c_bool)
br.br_progress.restype = c_float
# TODO: ??? how do *** ???
br.br_read_pipe.argtypes = [c_char_p, POINTER(c_int), POINTER(POINTER(c_char_p))]
br.br_scratch_path.argtypes = [c_char_p, c_int]
br.br_scratch_path.restype = c_int
br.br_scratch_path = _handle_string_func(br.br_scratch_path)
br.br_sdk_path.restype = c_char_p
def br_get_header_wrap(func):
def call_func(matrix, target_gallery, query_gallery):
arr_type1 = c_char_p*len(target_gallery)
arr_type2 = c_char_p*len(query_gallery)
func.argtypes = [c_char_p,arr_type1,arr_type2]
arr1 = arr_type1(*map(c_char_p, target_gallery))
arr2 = arr_type2(*map(c_char_p, query_gallery))
return func(matrix, arr1, arr2)
return call_func
br.br_get_header.argtypes = [c_char_p, POINTER(c_char_p), POINTER(c_char_p)]
br.br_set_header.argtypes = _string_args(3)
br.br_set_property.argtypes = _string_args(2)
br.br_time_remaining.restype = c_int
br.br_train.argtypes = _string_args(2)
br.br_train_n = _var_string_args_func(br.br_train_n, 1)
br.br_version.restype = c_char_p
br.br_slave_process.argtypes = [c_char_p]
br.br_load_img.argtypes = [c_char_p, c_int]
br.br_load_img.restype = c_void_p
br.br_unload_img.argtypes = [c_void_p]
br.br_unload_img.restype = POINTER(c_ubyte)
br.br_template_list_from_buffer.argtypes = [c_char_p, c_int]
br.br_template_list_from_buffer.restype = c_void_p
br.br_free_template.argtypes = [c_void_p]
br.br_free_template_list.argtypes = [c_void_p]
br.br_free_output.argtypes = [c_void_p]
br.br_img_rows.argtypes = [c_void_p]
br.br_img_rows.restype = c_int
br.br_img_cols.argtypes = [c_void_p]
br.br_img_cols.restype = c_int
br.br_img_channels.argtypes = [c_void_p]
br.br_img_channels.restype = c_int
br.br_img_is_empty.argtypes = [c_void_p]
br.br_img_is_empty.restype = c_bool
br.br_get_filename.argtypes = [c_char_p, c_int, c_void_p]
br.br_get_filename.restype = c_int
br.br_get_filename = _handle_string_func(br.br_get_filename)
br.br_set_filename.argtypes = [c_void_p, c_char_p]
br.br_get_metadata_string.argtypes = [c_char_p, c_int, c_void_p, c_char_p]
br.br_get_metadata_string.restype = c_int
br.br_get_metadata_string = _handle_string_func(br.br_get_metadata_string)
br.br_enroll_template.argtypes = [c_void_p]
br.br_enroll_template.restype = c_void_p
br.br_enroll_template_list.argtypes = [c_void_p]
br.br_enroll_template_list.restype = c_void_p
br.br_compare_template_lists.argtypes = [c_void_p, c_void_p]
br.br_compare_template_lists.restype = c_void_p
br.br_get_matrix_output_at.argtypes = [c_void_p, c_int, c_int]
br.br_get_matrix_output_at.restype = c_float
br.br_get_template.argtypes = [c_void_p, c_int]
br.br_get_template.restype = c_void_p
br.br_num_templates.argtypes = [c_void_p]
br.br_num_templates.restype = c_int
br.br_make_gallery.argtypes = [c_char_p]
br.br_make_gallery.restype = c_void_p
br.br_load_from_gallery.argtypes = [c_void_p]
br.br_load_from_gallery.restype = c_void_p
br.br_add_template_to_gallery.argtypes = [c_void_p, c_void_p]
br.br_add_template_list_to_gallery.argtypes = [c_void_p, c_void_p]
br.br_close_gallery.argtypes = [c_void_p]
return br