#!/usr/bin/env python
# vim: set fileencoding=utf-8 :
# @author: Elie Khoury <Elie.Khoury@idiap.ch>
# @date: Tue  9 Jun 23:10:43 CEST 2015
#
# Copyright (C) 2012-2015 Idiap Research Institute, Martigny, Switzerland
#
# 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, version 3 of the License.
#
# 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/>.


import unittest
import os
import numpy
from nose.plugins.skip import SkipTest

import pkg_resources

regenerate_refs = False

import bob.bio.base
import bob.bio.spear
import bob.db.verification.utils


def _compare(data, reference, write_function = bob.bio.base.save, read_function = bob.bio.base.load):
  # write reference?
  if regenerate_refs:
    write_function(data, reference)

  # compare reference
  reference = read_function(reference)
  assert numpy.allclose(data, reference, atol=1e-5)


def _wav():
  base_preprocessor = bob.bio.spear.preprocessor.Base()
  return base_preprocessor.read_original_data(pkg_resources.resource_filename('bob.bio.spear.test', 'data/sample.wav'))


def test_mfcc():
  # read input wave file
  wav = _wav()

  extractor = bob.bio.base.load_resource('mfcc_60', 'extractor')
  assert isinstance(extractor, bob.bio.spear.extractor.Cepstral)

  # test the Cepstral extractor
  extractor = bob.bio.spear.extractor.Cepstral()
  # but we need to apply VAD first
  preprocessor = bob.bio.spear.preprocessor.Energy_2Gauss()
  preprocessed_data = preprocessor(wav)
  _compare(extractor(preprocessed_data), pkg_resources.resource_filename('bob.bio.spear.test', 'data/mfcc_60.hdf5'), extractor.write_feature, extractor.read_feature)


def test_lfcc():
  # read input wave file
  wav = _wav()

  extractor = bob.bio.base.load_resource('lfcc_60', 'extractor')
  assert isinstance(extractor, bob.bio.spear.extractor.Cepstral)

  # test the Cepstral extractor
  extractor = bob.bio.spear.extractor.Cepstral(mel_scale=False)
  # but we need to apply VAD first
  preprocessor = bob.bio.spear.preprocessor.Energy_2Gauss()
  preprocessed_data = preprocessor(wav)
  _compare(extractor(preprocessed_data), pkg_resources.resource_filename('bob.bio.spear.test', 'data/lfcc_60.hdf5'), extractor.write_feature, extractor.read_feature)
