def get_record_time_info(h, record_id, tick_dt):
trig_time = ffi.new("time_t *")
frac_secs = ffi.new("double *")
trigger_minus_rec_start = ffi.new("long *")
result = lib.ADI_GetRecordTime(h[0], record_id - 1, trig_time,
frac_secs, trigger_minus_rec_start)
if result == 0:
return RecordTime(tick_dt, trig_time[0], frac_secs[0],
trigger_minus_rec_start[0])
else:
#TODO: Improve message
raise Exception('Error getting # of ticks in record')
def get_n_channels(h):
n_channels = ffi.new("long *")
result = lib.ADI_GetNumberOfChannels(h[0], n_channels)
if result == 0:
return n_channels[0]
else:
raise Exception('Error getting # of channels')
def get_n_records(h):
n_records = ffi.new("long *")
result = lib.ADI_GetNumberOfRecords(h[0], n_records)
if result == 0:
return n_records[0]
else:
raise Exception('Error getting # of records')
def get_channel_name(h, channel_id):
#TODO: Make length a variable
text = ffi.new("wchar_t[1000]")
max_chars = 999 #needs null termination???
text_length = ffi.new("long *")
result = lib.ADI_GetChannelName(h[0], channel_id - 1, text, max_chars,
text_length)
if not (result == 0 or result == 1):
print(result)
raise Exception('Error retrieving channel name')
#I think the length includes null terminaton so we substract 1
final_text = ffi.unpack(text, text_length[0] - 1)
return final_text
def get_comment(h2):
tick_pos = ffi.new("long *")
channel = ffi.new("long *")
comment_id = ffi.new("long *")
#TODO: Make length a variable
text = ffi.new("wchar_t[1000]")
max_chars = 999 #needs null termination????
text_length = ffi.new("long *")
result = lib.ADI_GetCommentInfo(h2[0], tick_pos, channel, comment_id,
text, max_chars, text_length)
if result != 0:
raise Exception('Error retrieving comment')
#I think the length includes null terminaton so we substract 1
final_text = ffi.unpack(text, text_length[0] - 1)
return Comment(final_text, tick_pos[0], channel[0], comment_id[0])
def get_sample_period(h, record_id, channel_id):
sample_period = ffi.new("double *")
result = lib.ADI_GetRecordSamplePeriod(h[0], channel_id - 1,
record_id - 1, sample_period)
if result == 0 or result == 1:
return sample_period[0]
else:
raise Exception('Error getting sample period')
def get_tick_period(h, record_id, channel_id):
tick_period = ffi.new("double *")
result = lib.ADI_GetRecordTickPeriod(h[0], channel_id - 1,
record_id - 1, tick_period)
if result == 0:
return tick_period[0]
else:
raise Exception('Error getting tick period')
def get_n_ticks_in_record(h, record_id):
n_ticks = ffi.new("long *")
result = lib.ADI_GetNumTicksInRecord(h[0], record_id - 1, n_ticks)
if result == 0:
return n_ticks[0]
else:
#TODO: Improve message
raise Exception('Error getting # of ticks in record')
def get_n_samples_in_record(h, record_id, channel_id):
n_samples = ffi.new("long *")
result = lib.ADI_GetNumSamplesInRecord(h[0], channel_id - 1,
record_id - 1, n_samples)
if result == 0 or result == 1:
return n_samples[0]
else:
raise Exception('Error getting # of samples in record')
def open_read_file(file_path):
h = ffi.new("ADI_FileHandle *")
result = lib.ADI_OpenFile(file_path, h, lib.kOpenFileForReadOnly)
if result == 0:
return h
else:
#TODO: Add more
raise Exception('Error opening file for reading')
def get_units_name(h, record_id, channel_id):
#TODO: Make length a variable
#Different interfae ...
# N = 10
#ptr = ffi.new( "float[]", N )
text = ffi.new("wchar_t[1000]")
max_chars = 999 #needs null termination???
text_length = ffi.new("long *")
result = lib.ADI_GetUnitsName(h[0], channel_id - 1, record_id - 1,
text, max_chars, text_length)
if not (result == 0 or result == 1):
print(result)
raise Exception('Error retrieving units')
#I think the length includes null terminaton so we substract 1
final_text = ffi.unpack(text, text_length[0] - 1)
return final_text
def get_comment_accessor(h, record_id):
"""
0 indicates no comments
"""
h2 = ffi.new("ADI_CommentsHandle *")
result = lib.ADI_CreateCommentsAccessor(h[0], record_id - 1, h2)
#No comments - not sure why we don't have a flag for this ...
if result == -1610313723:
return 0
elif result == 0:
return h2
else:
raise Exception('Error opening comments accessor')
def get_channel_data(h, record_id, channel_id, start_sample, stop_sample):
n_elements = stop_sample - start_sample + 1
np_arr = np.empty(n_elements, dtype=np.float32)
#Note, we might just be able to case to numpy after running
#=> numpy.frombuffer => 0 copy?
#https://ammous88.wordpress.com/2014/12/30/numpy-array-with-cffi-c-function/
cffi_arr = ffi.cast('float*', np_arr.ctypes.data)
returned = ffi.new("long *")
result = lib.ADI_GetSamples(h[0], channel_id - 1, record_id - 1,
start_sample - 1,
lib.kADICDataAtSampleRate, n_elements,
cffi_arr, returned)
if result == 0:
return np_arr
else:
raise Exception('Unable to retrieve requested data')