Move the aec_rdft* files to a more proper place beneath APM and make them thread-safe.

webrtc/modules/audio_processing/aec/aec_core.h

 /*
  *  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.
  */
 
 /*
  * Specifies the interface for the AEC core.
  */
 
 #ifndef WEBRTC_MODULES_AUDIO_PROCESSING_AEC_AEC_CORE_H_
 #define WEBRTC_MODULES_AUDIO_PROCESSING_AEC_AEC_CORE_H_
 
 #include <stddef.h>
 
 #include <memory>
 
 extern "C" {
 #include "webrtc/common_audio/ring_buffer.h"
 }
 #include "webrtc/base/constructormagic.h"
 #include "webrtc/common_audio/wav_file.h"
 #include "webrtc/modules/audio_processing/aec/aec_common.h"
 #include "webrtc/modules/audio_processing/utility/block_mean_calculator.h"
+#include "webrtc/modules/audio_processing/utility/ooura_fft.h"
 #include "webrtc/typedefs.h"
 
 namespace webrtc {
 
 #define FRAME_LEN 80
 #define PART_LEN 64               // Length of partition
 #define PART_LEN1 (PART_LEN + 1)  // Unique fft coefficients
 #define PART_LEN2 (PART_LEN * 2)  // Length of partition * 2
 #define NUM_HIGH_BANDS_MAX 2      // Max number of high bands
 
@@ skipping 88 matching lines @@
   complex_t sde[PART_LEN1];  // cross-psd of nearend and error
   complex_t sxd[PART_LEN1];  // cross-psd of farend and nearend
   float sx[PART_LEN1], sd[PART_LEN1], se[PART_LEN1];  // far, near, error psd
 } CoherenceState;
 
 struct AecCore {
   explicit AecCore(int instance_index);
   ~AecCore();
 
   std::unique_ptr<ApmDataDumper> data_dumper;
+  const OouraFft ooura_fft;
 
   CoherenceState coherence_state;
 
   int farBufWritePos, farBufReadPos;
 
   int knownDelay;
   int inSamples, outSamples;
   int delayEstCtr;
 
   // Nearend buffer used for changing from FRAME_LEN to PART_LEN sample block
@@ skipping 184 matching lines @@
 int WebRtcAec_system_delay(AecCore* self);
 
 // Sets the |system_delay| to |value|.  Note that if the value is changed
 // improperly, there can be a performance regression.  So it should be used with
 // care.
 void WebRtcAec_SetSystemDelay(AecCore* self, int delay);
 
 }  // namespace webrtc
 
 #endif  // WEBRTC_MODULES_AUDIO_PROCESSING_AEC_AEC_CORE_H_