chromium/third_party/webrtc/common_audio/signal_processing/complex_bit_reverse.c

/*
 *  Copyright (c) 2012 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/signal_processing/include/signal_processing_library.h"

/* Tables for data buffer indexes that are bit reversed and thus need to be
 * swapped. Note that, index_7[{0, 2, 4, ...}] are for the left side of the swap
 * operations, while index_7[{1, 3, 5, ...}] are for the right side of the
 * operation. Same for index_8.
 */

/* Indexes for the case of stages == 7. */
static const int16_t index_7[112] = …;

/* Indexes for the case of stages == 8. */
static const int16_t index_8[240] = …;

void WebRtcSpl_ComplexBitReverse(int16_t* __restrict complex_data, int stages) { … }