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SKP_Silk_burg_modified.go
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SKP_Silk_burg_modified.go
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package silk
import "unsafe"
const MAX_FRAME_SIZE = 544
const MAX_NB_SUBFR = 4
const N_BITS_HEAD_ROOM = 2
const MIN_RSHIFTS = -16
const MAX_RSHIFTS = 7
func SKP_Silk_burg_modified(res_nrg *int32, res_nrg_Q *int32, A_Q16 []int32, x []int16, subfr_length int32, nb_subfr int32, WhiteNoiseFrac_Q32 int32, D int32) {
var (
k int32
n int32
s int32
lz int32
rshifts int32
rshifts_extra int32
C0 int32
num int32
nrg int32
rc_Q31 int32
Atmp_25 int32
Atmp1 int32
tmp1 int32
tmp2 int32
x1 int32
x2 int32
x_ptr []int16
C_first_row [16]int32
C_last_row [16]int32
Af_25 [16]int32
CAf [17]int32
CAb [17]int32
)
SKP_assert(subfr_length*nb_subfr <= MAX_FRAME_SIZE)
SKP_assert(nb_subfr <= MAX_NB_SUBFR)
SKP_Silk_sum_sqr_shift(&C0, &rshifts, x, nb_subfr*subfr_length)
if rshifts > (32 - 25) {
C0 = C0 << (rshifts - (32 - 25))
SKP_assert(C0 > 0)
rshifts = 32 - 25
} else {
lz = SKP_Silk_CLZ32(C0) - 1
rshifts_extra = N_BITS_HEAD_ROOM - lz
if rshifts_extra > 0 {
if rshifts_extra < ((32 - 25) - rshifts) {
rshifts_extra = rshifts_extra
} else {
rshifts_extra = (32 - 25) - rshifts
}
C0 = C0 >> rshifts_extra
} else {
if int64(rshifts_extra) > (int64(-16 - int64(rshifts))) {
rshifts_extra = rshifts_extra
} else {
rshifts_extra = int32(-16 - int64(rshifts))
}
C0 = C0 << (-rshifts_extra)
}
rshifts += rshifts_extra
}
memset(unsafe.Pointer(&C_first_row[0]), 0, size_t(SKP_Silk_MAX_ORDER_LPC*unsafe.Sizeof(int32(0))))
if rshifts > 0 {
for s = 0; s < nb_subfr; s++ {
x_ptr = ([]int16)(&x[s*subfr_length])
for n = 1; n < D+1; n++ {
C_first_row[n-1] += int32(SKP_Silk_inner_prod16_aligned_64(x_ptr, ([]int16)(&x_ptr[n]), subfr_length-n) >> int64(rshifts))
}
}
} else {
for s = 0; s < nb_subfr; s++ {
x_ptr = ([]int16)(&x[s*subfr_length])
for n = 1; n < D+1; n++ {
C_first_row[n-1] += SKP_Silk_inner_prod_aligned(x_ptr, ([]int16)(&x_ptr[n]), subfr_length-n) << (-rshifts)
}
}
}
memcpy(unsafe.Pointer(&C_last_row[0]), unsafe.Pointer(&C_first_row[0]), size_t(SKP_Silk_MAX_ORDER_LPC*unsafe.Sizeof(int32(0))))
CAb[0] = func() int32 {
p := &CAf[0]
CAf[0] = C0 + SKP_SMMUL(WhiteNoiseFrac_Q32, C0) + 1
return *p
}()
for n = 0; n < D; n++ {
if int64(rshifts) > -2 {
for s = 0; s < nb_subfr; s++ {
x_ptr = ([]int16)(&x[s*subfr_length])
x1 = -((int32(x_ptr[n])) << (16 - rshifts))
x2 = -((int32(x_ptr[subfr_length-n-1])) << (16 - rshifts))
tmp1 = (int32(x_ptr[n])) << (25 - 16)
tmp2 = (int32(x_ptr[subfr_length-n-1])) << (25 - 16)
for k = 0; k < n; k++ {
C_first_row[k] = SKP_SMLAWB(C_first_row[k], x1, int32(x_ptr[n-k-1]))
C_last_row[k] = SKP_SMLAWB(C_last_row[k], x2, int32(x_ptr[subfr_length-n+k]))
Atmp_25 = Af_25[k]
tmp1 = SKP_SMLAWB(tmp1, Atmp_25, int32(x_ptr[n-k-1]))
tmp2 = SKP_SMLAWB(tmp2, Atmp_25, int32(x_ptr[subfr_length-n+k]))
}
tmp1 = (-tmp1) << (32 - 25 - rshifts)
tmp2 = (-tmp2) << (32 - 25 - rshifts)
for k = 0; k <= n; k++ {
CAf[k] = SKP_SMLAWB(CAf[k], tmp1, int32(x_ptr[n-k]))
CAb[k] = SKP_SMLAWB(CAb[k], tmp2, int32(x_ptr[subfr_length-n+k-1]))
}
}
} else {
for s = 0; s < nb_subfr; s++ {
x_ptr = ([]int16)(&x[s*subfr_length])
x1 = -((int32(x_ptr[n])) << (-rshifts))
x2 = -((int32(x_ptr[subfr_length-n-1])) << (-rshifts))
tmp1 = (int32(x_ptr[n])) << 17
tmp2 = (int32(x_ptr[subfr_length-n-1])) << 17
for k = 0; k < n; k++ {
C_first_row[k] = int32(int64(C_first_row[k]) + int64(x1)*int64(x_ptr[n-k-1]))
C_last_row[k] = int32(int64(C_last_row[k]) + int64(x2)*int64(x_ptr[subfr_length-n+k]))
Atmp1 = SKP_RSHIFT_ROUND(Af_25[k], 25-17)
tmp1 = int32(int64(tmp1) + int64(x_ptr[n-k-1])*int64(Atmp1))
tmp2 = int32(int64(tmp2) + int64(x_ptr[subfr_length-n+k])*int64(Atmp1))
}
tmp1 = -tmp1
tmp2 = -tmp2
for k = 0; k <= n; k++ {
CAf[k] = SKP_SMLAWW(CAf[k], tmp1, (int32(x_ptr[n-k]))<<(-rshifts-1))
CAb[k] = SKP_SMLAWW(CAb[k], tmp2, (int32(x_ptr[subfr_length-n+k-1]))<<(-rshifts-1))
}
}
}
tmp1 = C_first_row[n]
tmp2 = C_last_row[n]
num = 0
nrg = (CAb[0]) + (CAf[0])
for k = 0; k < n; k++ {
Atmp_25 = Af_25[k]
lz = SKP_Silk_CLZ32(int32(SKP_abs(int64(Atmp_25)))) - 1
if (32 - 25) < lz {
lz = 32 - 25
} else {
lz = lz
}
Atmp1 = Atmp_25 << lz
tmp1 = tmp1 + (SKP_SMMUL(C_last_row[n-k-1], Atmp1) << (32 - 25 - lz))
tmp2 = tmp2 + (SKP_SMMUL(C_first_row[n-k-1], Atmp1) << (32 - 25 - lz))
num = num + (SKP_SMMUL(CAb[n-k], Atmp1) << (32 - 25 - lz))
nrg = nrg + (SKP_SMMUL((CAb[k+1])+(CAf[k+1]), Atmp1) << (32 - 25 - lz))
}
CAf[n+1] = tmp1
CAb[n+1] = tmp2
num = num + tmp2
num = (-num) << 1
if SKP_abs(int64(num)) < int64(nrg) {
rc_Q31 = SKP_DIV32_varQ(num, nrg, 31)
} else {
memset(unsafe.Pointer(&Af_25[n]), 0, size_t(uintptr(D-n)*unsafe.Sizeof(int32(0))))
SKP_assert(0)
break
}
for k = 0; k < (n+1)>>1; k++ {
tmp1 = Af_25[k]
tmp2 = Af_25[n-k-1]
Af_25[k] = tmp1 + (SKP_SMMUL(tmp2, rc_Q31) << 1)
Af_25[n-k-1] = tmp2 + (SKP_SMMUL(tmp1, rc_Q31) << 1)
}
Af_25[n] = rc_Q31 >> (31 - 25)
for k = 0; k <= n+1; k++ {
tmp1 = CAf[k]
tmp2 = CAb[n-k+1]
CAf[k] = tmp1 + (SKP_SMMUL(tmp2, rc_Q31) << 1)
CAb[n-k+1] = tmp2 + (SKP_SMMUL(tmp1, rc_Q31) << 1)
}
}
nrg = CAf[0]
tmp1 = 1 << 16
for k = 0; k < D; k++ {
Atmp1 = SKP_RSHIFT_ROUND(Af_25[k], 25-16)
nrg = SKP_SMLAWW(nrg, CAf[k+1], Atmp1)
tmp1 = SKP_SMLAWW(tmp1, Atmp1, Atmp1)
A_Q16[k] = -Atmp1
}
*res_nrg = SKP_SMLAWW(nrg, SKP_SMMUL(WhiteNoiseFrac_Q32, C0), -tmp1)
*res_nrg_Q = -rshifts
}