def GetChannelData(self, index_list, start, duration):
freq = self.GetSamplingFrequency(index_list)
chunk_start_index, chunk_end_index = utils.GetSampleRange(
freq, duration, start)
channel_dict = {}
for index in index_list:
key = self._lookup.GetKeyFromIndex(index)
if self._feature[key].HasField('float_list'):
channel_data = self._feature[key].float_list.value
else:
raise ValueError('Channel %s is not a float value.' % key)
channel_dict[str(
index)] = channel_data[chunk_start_index:chunk_end_index]
return channel_dict
def testGetSampleRange(self): self.assertEqual((10, 20), utils.GetSampleRange(1, 10, 10))