1 files changed, 41 insertions, 0 deletions

diff --git a/xbmc/utils/test/Testrfft.cpp b/xbmc/utils/test/Testrfft.cpp
new file mode 100644
index 0000000..a6c859d
--- /dev/null
+++ b/xbmc/utils/test/Testrfft.cpp
@@ -0,0 +1,41 @@
+/*
+ *  Copyright (C) 2015-2018 Team Kodi
+ *  This file is part of Kodi - https://kodi.tv
+ *
+ *  SPDX-License-Identifier: GPL-2.0-or-later
+ *  See LICENSES/README.md for more information.
+ */
+
+#include "utils/rfft.h"
+
+#include <gtest/gtest.h>
+
+#if defined(TARGET_WINDOWS) && !defined(_USE_MATH_DEFINES)
+#define _USE_MATH_DEFINES
+#endif
+
+#include <math.h>
+
+
+TEST(TestRFFT, SimpleSignal)
+{
+  const int size = 32;
+  const int freq1 = 5;
+  const int freq2[] = {1,7};
+  std::vector<float> input(2*size);
+  std::vector<float> output(size);
+  for (size_t i=0;i<size;++i)
+  {
+    input[2*i] = cos(freq1*2.0*M_PI*i/size);
+    input[2*i+1] = cos(freq2[0]*2.0*M_PI*i/size)+cos(freq2[1]*2.0*M_PI*i/size);
+  }
+  RFFT transform(size, false);
+
+  transform.calc(&input[0], &output[0]);
+
+  for (int i=0;i<size/2;++i)
+  {
+    EXPECT_NEAR(output[2*i],(i==freq1?1.0:0.0), 1e-7);
+    EXPECT_NEAR(output[2*i+1], ((i==freq2[0]||i==freq2[1])?1.0:0.0), 1e-7);
+  }
+}