86 lines
2.6 KiB
C++
86 lines
2.6 KiB
C++
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/*
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* Copyright (c) 2012 The WebRTC project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#include "common_audio/signal_processing/include/real_fft.h"
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#include "common_audio/signal_processing/include/signal_processing_library.h"
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#include "typedefs.h"
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#include "gtest/gtest.h"
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namespace webrtc {
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namespace {
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const int kOrder = 3;
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const int kLength = 1 << (kOrder + 1); // +1 to hold complex data.
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const int16_t kRefData[kLength] = {
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11739, -6848, -8688, 31980, -30295, 25242, 27085, 19410, -26299, -15607,
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-10791, 11778, -23819, 14498, -25772, 10076
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};
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class RealFFTTest : public ::testing::Test {
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};
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TEST_F(RealFFTTest, CreateFailsOnBadInput) {
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RealFFT* fft = WebRtcSpl_CreateRealFFT(11);
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EXPECT_TRUE(fft == NULL);
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fft = WebRtcSpl_CreateRealFFT(-1);
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EXPECT_TRUE(fft == NULL);
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}
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// TODO(andrew): Look more into why this was failing.
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TEST_F(RealFFTTest, DISABLED_TransformIsInvertible) {
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int16_t data[kLength] = {0};
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memcpy(data, kRefData, sizeof(kRefData));
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RealFFT* fft = NULL;
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fft = WebRtcSpl_CreateRealFFT(kOrder);
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EXPECT_TRUE(fft != NULL);
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EXPECT_EQ(0, WebRtcSpl_RealForwardFFT(fft, data));
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int scale = WebRtcSpl_RealInverseFFT(fft, data);
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EXPECT_GE(scale, 0);
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for (int i = 0; i < kLength; i++) {
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EXPECT_EQ(data[i] << scale, kRefData[i]);
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}
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WebRtcSpl_FreeRealFFT(fft);
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}
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// TODO(andrew): This won't always be the case, but verifies the current code
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// at least.
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TEST_F(RealFFTTest, RealAndComplexAreIdentical) {
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int16_t real_data[kLength] = {0};
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int16_t complex_data[kLength] = {0};
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memcpy(real_data, kRefData, sizeof(kRefData));
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memcpy(complex_data, kRefData, sizeof(kRefData));
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RealFFT* fft = NULL;
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fft = WebRtcSpl_CreateRealFFT(kOrder);
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EXPECT_TRUE(fft != NULL);
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EXPECT_EQ(0, WebRtcSpl_RealForwardFFT(fft, real_data));
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EXPECT_EQ(0, WebRtcSpl_ComplexFFT(complex_data, kOrder, 1));
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for (int i = 0; i < kLength; i++) {
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EXPECT_EQ(real_data[i], complex_data[i]);
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}
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int real_scale = WebRtcSpl_RealInverseFFT(fft, real_data);
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int complex_scale = WebRtcSpl_ComplexIFFT(complex_data, kOrder, 1);
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EXPECT_GE(real_scale, 0);
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EXPECT_EQ(real_scale, complex_scale);
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for (int i = 0; i < kLength; i++) {
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EXPECT_EQ(real_data[i], complex_data[i]);
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}
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WebRtcSpl_FreeRealFFT(fft);
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}
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} // namespace
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} // namespace webrtc
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