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300 lines
9.6 KiB
300 lines
9.6 KiB
/*
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* Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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/*
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* This file contains the function WebRtcSpl_ComplexFFT().
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* The description header can be found in signal_processing_library.h
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*
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*/
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#include "common_audio/signal_processing/complex_fft_tables.h"
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#include "common_audio/signal_processing/include/signal_processing_library.h"
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#include "rtc_base/system/arch.h"
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#define CFFTSFT 14
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#define CFFTRND 1
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#define CFFTRND2 16384
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#define CIFFTSFT 14
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#define CIFFTRND 1
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int WebRtcSpl_ComplexFFT(int16_t frfi[], int stages, int mode)
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{
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int i, j, l, k, istep, n, m;
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int16_t wr, wi;
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int32_t tr32, ti32, qr32, qi32;
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/* The 1024-value is a constant given from the size of kSinTable1024[],
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* and should not be changed depending on the input parameter 'stages'
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*/
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n = 1 << stages;
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if (n > 1024)
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return -1;
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l = 1;
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k = 10 - 1; /* Constant for given kSinTable1024[]. Do not change
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depending on the input parameter 'stages' */
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if (mode == 0)
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{
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// mode==0: Low-complexity and Low-accuracy mode
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while (l < n)
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{
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istep = l << 1;
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for (m = 0; m < l; ++m)
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{
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j = m << k;
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/* The 256-value is a constant given as 1/4 of the size of
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* kSinTable1024[], and should not be changed depending on the input
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* parameter 'stages'. It will result in 0 <= j < N_SINE_WAVE/2
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*/
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wr = kSinTable1024[j + 256];
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wi = -kSinTable1024[j];
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for (i = m; i < n; i += istep)
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{
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j = i + l;
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tr32 = (wr * frfi[2 * j] - wi * frfi[2 * j + 1]) >> 15;
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ti32 = (wr * frfi[2 * j + 1] + wi * frfi[2 * j]) >> 15;
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qr32 = (int32_t)frfi[2 * i];
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qi32 = (int32_t)frfi[2 * i + 1];
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frfi[2 * j] = (int16_t)((qr32 - tr32) >> 1);
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frfi[2 * j + 1] = (int16_t)((qi32 - ti32) >> 1);
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frfi[2 * i] = (int16_t)((qr32 + tr32) >> 1);
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frfi[2 * i + 1] = (int16_t)((qi32 + ti32) >> 1);
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}
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}
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--k;
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l = istep;
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}
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} else
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{
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// mode==1: High-complexity and High-accuracy mode
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while (l < n)
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{
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istep = l << 1;
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for (m = 0; m < l; ++m)
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{
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j = m << k;
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/* The 256-value is a constant given as 1/4 of the size of
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* kSinTable1024[], and should not be changed depending on the input
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* parameter 'stages'. It will result in 0 <= j < N_SINE_WAVE/2
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*/
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wr = kSinTable1024[j + 256];
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wi = -kSinTable1024[j];
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#ifdef WEBRTC_ARCH_ARM_V7
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int32_t wri = 0;
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__asm __volatile("pkhbt %0, %1, %2, lsl #16" : "=r"(wri) :
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"r"((int32_t)wr), "r"((int32_t)wi));
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#endif
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for (i = m; i < n; i += istep)
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{
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j = i + l;
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#ifdef WEBRTC_ARCH_ARM_V7
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register int32_t frfi_r;
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__asm __volatile(
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"pkhbt %[frfi_r], %[frfi_even], %[frfi_odd],"
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" lsl #16\n\t"
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"smlsd %[tr32], %[wri], %[frfi_r], %[cfftrnd]\n\t"
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"smladx %[ti32], %[wri], %[frfi_r], %[cfftrnd]\n\t"
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:[frfi_r]"=&r"(frfi_r),
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[tr32]"=&r"(tr32),
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[ti32]"=r"(ti32)
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:[frfi_even]"r"((int32_t)frfi[2*j]),
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[frfi_odd]"r"((int32_t)frfi[2*j +1]),
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[wri]"r"(wri),
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[cfftrnd]"r"(CFFTRND));
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#else
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tr32 = wr * frfi[2 * j] - wi * frfi[2 * j + 1] + CFFTRND;
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ti32 = wr * frfi[2 * j + 1] + wi * frfi[2 * j] + CFFTRND;
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#endif
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tr32 >>= 15 - CFFTSFT;
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ti32 >>= 15 - CFFTSFT;
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qr32 = ((int32_t)frfi[2 * i]) * (1 << CFFTSFT);
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qi32 = ((int32_t)frfi[2 * i + 1]) * (1 << CFFTSFT);
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frfi[2 * j] = (int16_t)(
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(qr32 - tr32 + CFFTRND2) >> (1 + CFFTSFT));
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frfi[2 * j + 1] = (int16_t)(
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(qi32 - ti32 + CFFTRND2) >> (1 + CFFTSFT));
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frfi[2 * i] = (int16_t)(
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(qr32 + tr32 + CFFTRND2) >> (1 + CFFTSFT));
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frfi[2 * i + 1] = (int16_t)(
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(qi32 + ti32 + CFFTRND2) >> (1 + CFFTSFT));
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}
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}
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--k;
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l = istep;
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}
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}
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return 0;
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}
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int WebRtcSpl_ComplexIFFT(int16_t frfi[], int stages, int mode)
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{
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size_t i, j, l, istep, n, m;
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int k, scale, shift;
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int16_t wr, wi;
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int32_t tr32, ti32, qr32, qi32;
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int32_t tmp32, round2;
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/* The 1024-value is a constant given from the size of kSinTable1024[],
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* and should not be changed depending on the input parameter 'stages'
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*/
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n = ((size_t)1) << stages;
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if (n > 1024)
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return -1;
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scale = 0;
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l = 1;
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k = 10 - 1; /* Constant for given kSinTable1024[]. Do not change
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depending on the input parameter 'stages' */
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while (l < n)
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{
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// variable scaling, depending upon data
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shift = 0;
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round2 = 8192;
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tmp32 = WebRtcSpl_MaxAbsValueW16(frfi, 2 * n);
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if (tmp32 > 13573)
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{
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shift++;
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scale++;
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round2 <<= 1;
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}
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if (tmp32 > 27146)
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{
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shift++;
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scale++;
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round2 <<= 1;
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}
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istep = l << 1;
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if (mode == 0)
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{
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// mode==0: Low-complexity and Low-accuracy mode
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for (m = 0; m < l; ++m)
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{
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j = m << k;
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/* The 256-value is a constant given as 1/4 of the size of
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* kSinTable1024[], and should not be changed depending on the input
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* parameter 'stages'. It will result in 0 <= j < N_SINE_WAVE/2
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*/
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wr = kSinTable1024[j + 256];
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wi = kSinTable1024[j];
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for (i = m; i < n; i += istep)
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{
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j = i + l;
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tr32 = (wr * frfi[2 * j] - wi * frfi[2 * j + 1]) >> 15;
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ti32 = (wr * frfi[2 * j + 1] + wi * frfi[2 * j]) >> 15;
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qr32 = (int32_t)frfi[2 * i];
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qi32 = (int32_t)frfi[2 * i + 1];
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frfi[2 * j] = (int16_t)((qr32 - tr32) >> shift);
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frfi[2 * j + 1] = (int16_t)((qi32 - ti32) >> shift);
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frfi[2 * i] = (int16_t)((qr32 + tr32) >> shift);
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frfi[2 * i + 1] = (int16_t)((qi32 + ti32) >> shift);
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}
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}
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} else
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{
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// mode==1: High-complexity and High-accuracy mode
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for (m = 0; m < l; ++m)
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{
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j = m << k;
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/* The 256-value is a constant given as 1/4 of the size of
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* kSinTable1024[], and should not be changed depending on the input
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* parameter 'stages'. It will result in 0 <= j < N_SINE_WAVE/2
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*/
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wr = kSinTable1024[j + 256];
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wi = kSinTable1024[j];
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#ifdef WEBRTC_ARCH_ARM_V7
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int32_t wri = 0;
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__asm __volatile("pkhbt %0, %1, %2, lsl #16" : "=r"(wri) :
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"r"((int32_t)wr), "r"((int32_t)wi));
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#endif
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for (i = m; i < n; i += istep)
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{
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j = i + l;
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#ifdef WEBRTC_ARCH_ARM_V7
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register int32_t frfi_r;
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__asm __volatile(
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"pkhbt %[frfi_r], %[frfi_even], %[frfi_odd], lsl #16\n\t"
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"smlsd %[tr32], %[wri], %[frfi_r], %[cifftrnd]\n\t"
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"smladx %[ti32], %[wri], %[frfi_r], %[cifftrnd]\n\t"
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:[frfi_r]"=&r"(frfi_r),
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[tr32]"=&r"(tr32),
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[ti32]"=r"(ti32)
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:[frfi_even]"r"((int32_t)frfi[2*j]),
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[frfi_odd]"r"((int32_t)frfi[2*j +1]),
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[wri]"r"(wri),
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[cifftrnd]"r"(CIFFTRND)
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);
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#else
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tr32 = wr * frfi[2 * j] - wi * frfi[2 * j + 1] + CIFFTRND;
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ti32 = wr * frfi[2 * j + 1] + wi * frfi[2 * j] + CIFFTRND;
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#endif
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tr32 >>= 15 - CIFFTSFT;
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ti32 >>= 15 - CIFFTSFT;
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qr32 = ((int32_t)frfi[2 * i]) * (1 << CIFFTSFT);
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qi32 = ((int32_t)frfi[2 * i + 1]) * (1 << CIFFTSFT);
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frfi[2 * j] = (int16_t)(
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(qr32 - tr32 + round2) >> (shift + CIFFTSFT));
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frfi[2 * j + 1] = (int16_t)(
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(qi32 - ti32 + round2) >> (shift + CIFFTSFT));
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frfi[2 * i] = (int16_t)(
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(qr32 + tr32 + round2) >> (shift + CIFFTSFT));
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frfi[2 * i + 1] = (int16_t)(
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(qi32 + ti32 + round2) >> (shift + CIFFTSFT));
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}
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}
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}
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--k;
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l = istep;
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}
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return scale;
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}
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