1 files changed, 51 insertions, 0 deletions
diff --git a/third_party/libwebrtc/common_audio/real_fourier.cc b/third_party/libwebrtc/common_audio/real_fourier.cc
new file mode 100644
index 0000000000..7365844e8d
--- /dev/null
+++ b/third_party/libwebrtc/common_audio/real_fourier.cc
@@ -0,0 +1,51 @@
+/*
+ *  Copyright (c) 2014 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#include "common_audio/real_fourier.h"
+
+#include "common_audio/real_fourier_ooura.h"
+#include "common_audio/signal_processing/include/signal_processing_library.h"
+#include "rtc_base/checks.h"
+
+namespace webrtc {
+
+using std::complex;
+
+const size_t RealFourier::kFftBufferAlignment = 32;
+
+std::unique_ptr<RealFourier> RealFourier::Create(int fft_order) {
+  return std::unique_ptr<RealFourier>(new RealFourierOoura(fft_order));
+}
+
+int RealFourier::FftOrder(size_t length) {
+  RTC_CHECK_GT(length, 0U);
+  return WebRtcSpl_GetSizeInBits(static_cast<uint32_t>(length - 1));
+}
+
+size_t RealFourier::FftLength(int order) {
+  RTC_CHECK_GE(order, 0);
+  return size_t{1} << order;
+}
+
+size_t RealFourier::ComplexLength(int order) {
+  return FftLength(order) / 2 + 1;
+}
+
+RealFourier::fft_real_scoper RealFourier::AllocRealBuffer(int count) {
+  return fft_real_scoper(static_cast<float*>(
+      AlignedMalloc(sizeof(float) * count, kFftBufferAlignment)));
+}
+
+RealFourier::fft_cplx_scoper RealFourier::AllocCplxBuffer(int count) {
+  return fft_cplx_scoper(static_cast<complex<float>*>(
+      AlignedMalloc(sizeof(complex<float>) * count, kFftBufferAlignment)));
+}
+
+}  // namespace webrtc