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

webrtc/modules/audio_processing/aec/aec_rdft.h

-/*
- *  Copyright (c) 2011 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_AEC_MAIN_SOURCE_AEC_RDFT_H_
-#define WEBRTC_MODULES_AUDIO_PROCESSING_AEC_MAIN_SOURCE_AEC_RDFT_H_
-
-#include "webrtc/modules/audio_processing/aec/aec_common.h"
-
-// These intrinsics were unavailable before VS 2008.
-// TODO(andrew): move to a common file.
-#if defined(_MSC_VER) && _MSC_VER < 1500
-#include <emmintrin.h>
-static __inline __m128 _mm_castsi128_ps(__m128i a) { return *(__m128*)&a; }
-static __inline __m128i _mm_castps_si128(__m128 a) { return *(__m128i*)&a; }
-#endif
-
-// Constants shared by all paths (C, SSE2, NEON).
-extern const float rdft_w[64];
-// Constants used by the C path.
-extern const float rdft_wk3ri_first[16];
-extern const float rdft_wk3ri_second[16];
-// Constants used by SSE2 and NEON but initialized in the C path.
-extern ALIGN16_BEG const float ALIGN16_END rdft_wk1r[32];
-extern ALIGN16_BEG const float ALIGN16_END rdft_wk2r[32];
-extern ALIGN16_BEG const float ALIGN16_END rdft_wk3r[32];
-extern ALIGN16_BEG const float ALIGN16_END rdft_wk1i[32];
-extern ALIGN16_BEG const float ALIGN16_END rdft_wk2i[32];
-extern ALIGN16_BEG const float ALIGN16_END rdft_wk3i[32];
-extern ALIGN16_BEG const float ALIGN16_END cftmdl_wk1r[4];
-
-// code path selection function pointers
-typedef void (*RftSub128)(float* a);
-extern RftSub128 rftfsub_128;
-extern RftSub128 rftbsub_128;
-extern RftSub128 cft1st_128;
-extern RftSub128 cftmdl_128;
-extern RftSub128 cftfsub_128;
-extern RftSub128 cftbsub_128;
-extern RftSub128 bitrv2_128;
-
-// entry points
-void aec_rdft_init(void);
-void aec_rdft_init_sse2(void);
-void aec_rdft_forward_128(float* a);
-void aec_rdft_inverse_128(float* a);
-
-#if defined(MIPS_FPU_LE)
-void aec_rdft_init_mips(void);
-#endif
-#if defined(WEBRTC_HAS_NEON)
-void aec_rdft_init_neon(void);
-#endif
-
-#endif  // WEBRTC_MODULES_AUDIO_PROCESSING_AEC_MAIN_SOURCE_AEC_RDFT_H_