src/third_party/webrtc/common_audio/window_generator_unittest.cc

   1 /*
   2  *  Copyright (c) 2014 The WebRTC project authors. All Rights Reserved.
   3  *
   4  *  Use of this source code is governed by a BSD-style license
   5  *  that can be found in the LICENSE file in the root of the source
   6  *  tree. An additional intellectual property rights grant can be found
   7  *  in the file PATENTS.  All contributing project authors may
   8  *  be found in the AUTHORS file in the root of the source tree.
   9  */
  10
  11 #include "webrtc/common_audio/window_generator.h"
  12
  13 #include <cstring>
  14
  15 #include "testing/gtest/include/gtest/gtest.h"
  16
  17 namespace webrtc {
  18
  19 TEST(WindowGeneratorTest, KaiserBesselDerived) {
  20   float window[7];
  21
  22   memset(window, 0, sizeof(window));
  23
  24   WindowGenerator::KaiserBesselDerived(0.397856f, 2, window);
  25   ASSERT_NEAR(window[0], 0.707106f, 1e-6f);
  26   ASSERT_NEAR(window[1], 0.707106f, 1e-6f);
  27   ASSERT_NEAR(window[2], 0.0f, 1e-6f);
  28   ASSERT_NEAR(window[3], 0.0f, 1e-6f);
  29   ASSERT_NEAR(window[4], 0.0f, 1e-6f);
  30   ASSERT_NEAR(window[5], 0.0f, 1e-6f);
  31   ASSERT_NEAR(window[6], 0.0f, 1e-6f);
  32
  33   WindowGenerator::KaiserBesselDerived(0.397856f, 3, window);
  34   ASSERT_NEAR(window[0], 0.598066f, 1e-6f);
  35   ASSERT_NEAR(window[1], 0.922358f, 1e-6f);
  36   ASSERT_NEAR(window[2], 0.598066f, 1e-6f);
  37   ASSERT_NEAR(window[3], 0.0f, 1e-6f);
  38   ASSERT_NEAR(window[4], 0.0f, 1e-6f);
  39   ASSERT_NEAR(window[5], 0.0f, 1e-6f);
  40   ASSERT_NEAR(window[6], 0.0f, 1e-6f);
  41
  42   WindowGenerator::KaiserBesselDerived(0.397856f, 6, window);
  43   ASSERT_NEAR(window[0], 0.458495038865344f, 1e-6f);
  44   ASSERT_NEAR(window[1], 0.707106781186548f, 1e-6f);
  45   ASSERT_NEAR(window[2], 0.888696967101760f, 1e-6f);
  46   ASSERT_NEAR(window[3], 0.888696967101760f, 1e-6f);
  47   ASSERT_NEAR(window[4], 0.707106781186548f, 1e-6f);
  48   ASSERT_NEAR(window[5], 0.458495038865344f, 1e-6f);
  49   ASSERT_NEAR(window[6], 0.0f, 1e-6f);
  50 }
  51
  52 TEST(WindowGeneratorTest, Hanning) {
  53   float window[7];
  54
  55   memset(window, 0, sizeof(window));
  56
  57   window[0] = -1.0f;
  58   window[1] = -1.0f;
  59   WindowGenerator::Hanning(2, window);
  60   ASSERT_NEAR(window[0], 0.0f, 1e-6f);
  61   ASSERT_NEAR(window[1], 0.0f, 1e-6f);
  62   ASSERT_NEAR(window[2], 0.0f, 1e-6f);
  63   ASSERT_NEAR(window[3], 0.0f, 1e-6f);
  64   ASSERT_NEAR(window[4], 0.0f, 1e-6f);
  65   ASSERT_NEAR(window[5], 0.0f, 1e-6f);
  66   ASSERT_NEAR(window[6], 0.0f, 1e-6f);
  67
  68   window[0] = -1.0f;
  69   window[2] = -1.0f;
  70   WindowGenerator::Hanning(3, window);
  71   ASSERT_NEAR(window[0], 0.0f, 1e-6f);
  72   ASSERT_NEAR(window[1], 1.0f, 1e-6f);
  73   ASSERT_NEAR(window[2], 0.0f, 1e-6f);
  74   ASSERT_NEAR(window[3], 0.0f, 1e-6f);
  75   ASSERT_NEAR(window[4], 0.0f, 1e-6f);
  76   ASSERT_NEAR(window[5], 0.0f, 1e-6f);
  77   ASSERT_NEAR(window[6], 0.0f, 1e-6f);
  78
  79   window[0] = -1.0f;
  80   window[5] = -1.0f;
  81   WindowGenerator::Hanning(6, window);
  82   ASSERT_NEAR(window[0], 0.0f, 1e-6f);
  83   ASSERT_NEAR(window[1], 0.345491f, 1e-6f);
  84   ASSERT_NEAR(window[2], 0.904508f, 1e-6f);
  85   ASSERT_NEAR(window[3], 0.904508f, 1e-6f);
  86   ASSERT_NEAR(window[4], 0.345491f, 1e-6f);
  87   ASSERT_NEAR(window[5], 0.0f, 1e-6f);
  88   ASSERT_NEAR(window[6], 0.0f, 1e-6f);
  89 }
  90
  91 }  // namespace webrtc
  92