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session-android/jni/webrtc/common_audio/signal_processing/complex_fft.c
Moxie Marlinspike d83a3d71bc Support for Signal calls. 
Merge in RedPhone

// FREEBIE
2015-09-30 14:30:09 -07:00

307 lines
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/*
* 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.
*/
/*
* This file contains the function WebRtcSpl_ComplexFFT().
* The description header can be found in signal_processing_library.h
*
*/
#include "webrtc/common_audio/signal_processing/complex_fft_tables.h"
#include "webrtc/common_audio/signal_processing/include/signal_processing_library.h"
#define CFFTSFT 14
#define CFFTRND 1
#define CFFTRND2 16384
#define CIFFTSFT 14
#define CIFFTRND 1
int WebRtcSpl_ComplexFFT(int16_t frfi[], int stages, int mode)
{
int i, j, l, k, istep, n, m;
int16_t wr, wi;
int32_t tr32, ti32, qr32, qi32;
/* The 1024-value is a constant given from the size of kSinTable1024[],
* and should not be changed depending on the input parameter 'stages'
*/
n = 1 << stages;
if (n > 1024)
return -1;
l = 1;
k = 10 - 1; /* Constant for given kSinTable1024[]. Do not change
depending on the input parameter 'stages' */
if (mode == 0)
{
// mode==0: Low-complexity and Low-accuracy mode
while (l < n)
{
istep = l << 1;
for (m = 0; m < l; ++m)
{
j = m << k;
/* The 256-value is a constant given as 1/4 of the size of
* kSinTable1024[], and should not be changed depending on the input
* parameter 'stages'. It will result in 0 <= j < N_SINE_WAVE/2
*/
wr = kSinTable1024[j + 256];
wi = -kSinTable1024[j];
for (i = m; i < n; i += istep)
{
j = i + l;
tr32 = WEBRTC_SPL_RSHIFT_W32((WEBRTC_SPL_MUL_16_16(wr, frfi[2 * j])
- WEBRTC_SPL_MUL_16_16(wi, frfi[2 * j + 1])), 15);
ti32 = WEBRTC_SPL_RSHIFT_W32((WEBRTC_SPL_MUL_16_16(wr, frfi[2 * j + 1])
+ WEBRTC_SPL_MUL_16_16(wi, frfi[2 * j])), 15);
qr32 = (int32_t)frfi[2 * i];
qi32 = (int32_t)frfi[2 * i + 1];
frfi[2 * j] = (int16_t)WEBRTC_SPL_RSHIFT_W32(qr32 - tr32, 1);
frfi[2 * j + 1] = (int16_t)WEBRTC_SPL_RSHIFT_W32(qi32 - ti32, 1);
frfi[2 * i] = (int16_t)WEBRTC_SPL_RSHIFT_W32(qr32 + tr32, 1);
frfi[2 * i + 1] = (int16_t)WEBRTC_SPL_RSHIFT_W32(qi32 + ti32, 1);
}
}
--k;
l = istep;
}
} else
{
// mode==1: High-complexity and High-accuracy mode
while (l < n)
{
istep = l << 1;
for (m = 0; m < l; ++m)
{
j = m << k;
/* The 256-value is a constant given as 1/4 of the size of
* kSinTable1024[], and should not be changed depending on the input
* parameter 'stages'. It will result in 0 <= j < N_SINE_WAVE/2
*/
wr = kSinTable1024[j + 256];
wi = -kSinTable1024[j];
#ifdef WEBRTC_ARCH_ARM_V7
int32_t wri = 0;
__asm __volatile("pkhbt %0, %1, %2, lsl #16" : "=r"(wri) :
"r"((int32_t)wr), "r"((int32_t)wi));
#endif
for (i = m; i < n; i += istep)
{
j = i + l;
#ifdef WEBRTC_ARCH_ARM_V7
register int32_t frfi_r;
__asm __volatile(
"pkhbt %[frfi_r], %[frfi_even], %[frfi_odd],"
" lsl #16\n\t"
"smlsd %[tr32], %[wri], %[frfi_r], %[cfftrnd]\n\t"
"smladx %[ti32], %[wri], %[frfi_r], %[cfftrnd]\n\t"
:[frfi_r]"=&r"(frfi_r),
[tr32]"=&r"(tr32),
[ti32]"=r"(ti32)
:[frfi_even]"r"((int32_t)frfi[2*j]),
[frfi_odd]"r"((int32_t)frfi[2*j +1]),
[wri]"r"(wri),
[cfftrnd]"r"(CFFTRND));
#else
tr32 = WEBRTC_SPL_MUL_16_16(wr, frfi[2 * j])
- WEBRTC_SPL_MUL_16_16(wi, frfi[2 * j + 1]) + CFFTRND;
ti32 = WEBRTC_SPL_MUL_16_16(wr, frfi[2 * j + 1])
+ WEBRTC_SPL_MUL_16_16(wi, frfi[2 * j]) + CFFTRND;
#endif
tr32 = WEBRTC_SPL_RSHIFT_W32(tr32, 15 - CFFTSFT);
ti32 = WEBRTC_SPL_RSHIFT_W32(ti32, 15 - CFFTSFT);
qr32 = ((int32_t)frfi[2 * i]) << CFFTSFT;
qi32 = ((int32_t)frfi[2 * i + 1]) << CFFTSFT;
frfi[2 * j] = (int16_t)WEBRTC_SPL_RSHIFT_W32(
(qr32 - tr32 + CFFTRND2), 1 + CFFTSFT);
frfi[2 * j + 1] = (int16_t)WEBRTC_SPL_RSHIFT_W32(
(qi32 - ti32 + CFFTRND2), 1 + CFFTSFT);
frfi[2 * i] = (int16_t)WEBRTC_SPL_RSHIFT_W32(
(qr32 + tr32 + CFFTRND2), 1 + CFFTSFT);
frfi[2 * i + 1] = (int16_t)WEBRTC_SPL_RSHIFT_W32(
(qi32 + ti32 + CFFTRND2), 1 + CFFTSFT);
}
}
--k;
l = istep;
}
}
return 0;
}
int WebRtcSpl_ComplexIFFT(int16_t frfi[], int stages, int mode)
{
int i, j, l, k, istep, n, m, scale, shift;
int16_t wr, wi;
int32_t tr32, ti32, qr32, qi32;
int32_t tmp32, round2;
/* The 1024-value is a constant given from the size of kSinTable1024[],
* and should not be changed depending on the input parameter 'stages'
*/
n = 1 << stages;
if (n > 1024)
return -1;
scale = 0;
l = 1;
k = 10 - 1; /* Constant for given kSinTable1024[]. Do not change
depending on the input parameter 'stages' */
while (l < n)
{
// variable scaling, depending upon data
shift = 0;
round2 = 8192;
tmp32 = (int32_t)WebRtcSpl_MaxAbsValueW16(frfi, 2 * n);
if (tmp32 > 13573)
{
shift++;
scale++;
round2 <<= 1;
}
if (tmp32 > 27146)
{
shift++;
scale++;
round2 <<= 1;
}
istep = l << 1;
if (mode == 0)
{
// mode==0: Low-complexity and Low-accuracy mode
for (m = 0; m < l; ++m)
{
j = m << k;
/* The 256-value is a constant given as 1/4 of the size of
* kSinTable1024[], and should not be changed depending on the input
* parameter 'stages'. It will result in 0 <= j < N_SINE_WAVE/2
*/
wr = kSinTable1024[j + 256];
wi = kSinTable1024[j];
for (i = m; i < n; i += istep)
{
j = i + l;
tr32 = WEBRTC_SPL_RSHIFT_W32((WEBRTC_SPL_MUL_16_16_RSFT(wr, frfi[2 * j], 0)
- WEBRTC_SPL_MUL_16_16_RSFT(wi, frfi[2 * j + 1], 0)), 15);
ti32 = WEBRTC_SPL_RSHIFT_W32(
(WEBRTC_SPL_MUL_16_16_RSFT(wr, frfi[2 * j + 1], 0)
+ WEBRTC_SPL_MUL_16_16_RSFT(wi,frfi[2*j],0)), 15);
qr32 = (int32_t)frfi[2 * i];
qi32 = (int32_t)frfi[2 * i + 1];
frfi[2 * j] = (int16_t)WEBRTC_SPL_RSHIFT_W32(qr32 - tr32, shift);
frfi[2 * j + 1] = (int16_t)WEBRTC_SPL_RSHIFT_W32(qi32 - ti32, shift);
frfi[2 * i] = (int16_t)WEBRTC_SPL_RSHIFT_W32(qr32 + tr32, shift);
frfi[2 * i + 1] = (int16_t)WEBRTC_SPL_RSHIFT_W32(qi32 + ti32, shift);
}
}
} else
{
// mode==1: High-complexity and High-accuracy mode
for (m = 0; m < l; ++m)
{
j = m << k;
/* The 256-value is a constant given as 1/4 of the size of
* kSinTable1024[], and should not be changed depending on the input
* parameter 'stages'. It will result in 0 <= j < N_SINE_WAVE/2
*/
wr = kSinTable1024[j + 256];
wi = kSinTable1024[j];
#ifdef WEBRTC_ARCH_ARM_V7
int32_t wri = 0;
__asm __volatile("pkhbt %0, %1, %2, lsl #16" : "=r"(wri) :
"r"((int32_t)wr), "r"((int32_t)wi));
#endif
for (i = m; i < n; i += istep)
{
j = i + l;
#ifdef WEBRTC_ARCH_ARM_V7
register int32_t frfi_r;
__asm __volatile(
"pkhbt %[frfi_r], %[frfi_even], %[frfi_odd], lsl #16\n\t"
"smlsd %[tr32], %[wri], %[frfi_r], %[cifftrnd]\n\t"
"smladx %[ti32], %[wri], %[frfi_r], %[cifftrnd]\n\t"
:[frfi_r]"=&r"(frfi_r),
[tr32]"=&r"(tr32),
[ti32]"=r"(ti32)
:[frfi_even]"r"((int32_t)frfi[2*j]),
[frfi_odd]"r"((int32_t)frfi[2*j +1]),
[wri]"r"(wri),
[cifftrnd]"r"(CIFFTRND)
);
#else
tr32 = WEBRTC_SPL_MUL_16_16(wr, frfi[2 * j])
- WEBRTC_SPL_MUL_16_16(wi, frfi[2 * j + 1]) + CIFFTRND;
ti32 = WEBRTC_SPL_MUL_16_16(wr, frfi[2 * j + 1])
+ WEBRTC_SPL_MUL_16_16(wi, frfi[2 * j]) + CIFFTRND;
#endif
tr32 = WEBRTC_SPL_RSHIFT_W32(tr32, 15 - CIFFTSFT);
ti32 = WEBRTC_SPL_RSHIFT_W32(ti32, 15 - CIFFTSFT);
qr32 = ((int32_t)frfi[2 * i]) << CIFFTSFT;
qi32 = ((int32_t)frfi[2 * i + 1]) << CIFFTSFT;
frfi[2 * j] = (int16_t)WEBRTC_SPL_RSHIFT_W32((qr32 - tr32+round2),
shift+CIFFTSFT);
frfi[2 * j + 1] = (int16_t)WEBRTC_SPL_RSHIFT_W32(
(qi32 - ti32 + round2), shift + CIFFTSFT);
frfi[2 * i] = (int16_t)WEBRTC_SPL_RSHIFT_W32((qr32 + tr32 + round2),
shift + CIFFTSFT);
frfi[2 * i + 1] = (int16_t)WEBRTC_SPL_RSHIFT_W32(
(qi32 + ti32 + round2), shift + CIFFTSFT);
}
}
}
--k;
l = istep;
}
return scale;
}
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