aa30bb7ef5
BUG=1662 R=tina.legrand@webrtc.org Review URL: https://webrtc-codereview.appspot.com/1535005 git-svn-id: http://webrtc.googlecode.com/svn/trunk@4107 4adac7df-926f-26a2-2b94-8c16560cd09d
78 lines
2.5 KiB
C++
78 lines
2.5 KiB
C++
/*
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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 "webrtc/common_audio/signal_processing/include/real_fft.h"
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#include "webrtc/common_audio/signal_processing/include/signal_processing_library.h"
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#include "webrtc/typedefs.h"
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#include "testing/gtest/include/gtest/gtest.h"
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namespace webrtc {
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namespace {
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const int kOrder = 4;
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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,
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-26299, 15607, -10791, 11778, -23819, 14498, -25772, 10076,
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1173, 6848, -8688, 31980, -30295, 2522, 27085, 19410,
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-2629, 5607, -3, 1178, -23819, 1498, -25772, 10076
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};
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class RealFFTTest : public ::testing::Test {
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protected:
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RealFFTTest() {
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WebRtcSpl_Init();
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}
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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): 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 real_data_out[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 = WebRtcSpl_CreateRealFFT(kOrder);
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EXPECT_TRUE(fft != NULL);
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EXPECT_EQ(0, WebRtcSpl_RealForwardFFT(fft, real_data, real_data_out));
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WebRtcSpl_ComplexBitReverse(complex_data, kOrder);
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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_out[i], complex_data[i]);
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}
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memcpy(complex_data, kRefData, sizeof(kRefData));
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int real_scale = WebRtcSpl_RealInverseFFT(fft, real_data, real_data_out);
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EXPECT_GE(real_scale, 0);
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WebRtcSpl_ComplexBitReverse(complex_data, kOrder);
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int complex_scale = WebRtcSpl_ComplexIFFT(complex_data, kOrder, 1);
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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_out[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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