Finalization of the first version of EchoCanceller 3

webrtc/modules/audio_processing/aec3/aec3_common.h

 /*
  *  Copyright (c) 2016 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.
  */
 
-#ifndef WEBRTC_MODULES_AUDIO_PROCESSING_AEC3_AEC3_CONSTANTS_H_
-#define WEBRTC_MODULES_AUDIO_PROCESSING_AEC3_AEC3_CONSTANTS_H_
+#ifndef WEBRTC_MODULES_AUDIO_PROCESSING_AEC3_AEC3_COMMON_H_
+#define WEBRTC_MODULES_AUDIO_PROCESSING_AEC3_AEC3_COMMON_H_
 
 #include <stddef.h>
+#include "webrtc/typedefs.h"
 
 namespace webrtc {
 
+#ifdef _MSC_VER /* visual c++ */
+#define ALIGN16_BEG __declspec(align(16))
+#define ALIGN16_END
+#else /* gcc or icc */
+#define ALIGN16_BEG
+#define ALIGN16_END __attribute__((aligned(16)))
+#endif
+
+enum class Aec3Optimization { kNone, kSse2 };
+
 constexpr size_t kFftLengthBy2 = 64;
 constexpr size_t kFftLengthBy2Plus1 = kFftLengthBy2 + 1;
+constexpr size_t kFftLengthBy2Minus1 = kFftLengthBy2 - 1;
 constexpr size_t kFftLength = 2 * kFftLengthBy2;
 
 constexpr size_t kMaxNumBands = 3;
 constexpr size_t kSubFrameLength = 80;
 
 constexpr size_t kBlockSize = kFftLengthBy2;
 constexpr size_t kExtendedBlockSize = 2 * kFftLengthBy2;
 constexpr size_t kSubBlockSize = 16;
 
 constexpr size_t NumBandsForRate(int sample_rate_hz) {
   return static_cast<size_t>(sample_rate_hz == 8000 ? 1
                                                     : sample_rate_hz / 16000);
 }
 constexpr int LowestBandRate(int sample_rate_hz) {
   return sample_rate_hz == 8000 ? sample_rate_hz : 16000;
 }
 
 constexpr bool ValidFullBandRate(int sample_rate_hz) {
   return sample_rate_hz == 8000 || sample_rate_hz == 16000 ||
          sample_rate_hz == 32000 || sample_rate_hz == 48000;
 }
 
+// Detects what kind of optimizations to use for the code.
+Aec3Optimization DetectOptimization();
+
 static_assert(1 == NumBandsForRate(8000), "Number of bands for 8 kHz");
 static_assert(1 == NumBandsForRate(16000), "Number of bands for 16 kHz");
 static_assert(2 == NumBandsForRate(32000), "Number of bands for 32 kHz");
 static_assert(3 == NumBandsForRate(48000), "Number of bands for 48 kHz");
 
 static_assert(8000 == LowestBandRate(8000), "Sample rate of band 0 for 8 kHz");
 static_assert(16000 == LowestBandRate(16000),
               "Sample rate of band 0 for 16 kHz");
 static_assert(16000 == LowestBandRate(32000),
               "Sample rate of band 0 for 32 kHz");
 static_assert(16000 == LowestBandRate(48000),
               "Sample rate of band 0 for 48 kHz");
 
 static_assert(ValidFullBandRate(8000),
               "Test that 8 kHz is a valid sample rate");
 static_assert(ValidFullBandRate(16000),
               "Test that 16 kHz is a valid sample rate");
 static_assert(ValidFullBandRate(32000),
               "Test that 32 kHz is a valid sample rate");
 static_assert(ValidFullBandRate(48000),
               "Test that 48 kHz is a valid sample rate");
 static_assert(!ValidFullBandRate(8001),
               "Test that 8001 Hz is not a valid sample rate");
 
 }  // namespace webrtc
 
-#endif  // WEBRTC_MODULES_AUDIO_PROCESSING_AEC3_AEC3_CONSTANTS_H_
+#endif  // WEBRTC_MODULES_AUDIO_PROCESSING_AEC3_AEC3_COMMON_H_