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SKP_Silk_MA.go
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SKP_Silk_MA.go
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package silk
func SKP_Silk_MA_Prediction(in []int16, B []int16, S []int32, out []int16, len_ int32, order int32) {
var (
k int32
d int32
in16 int32
out32 int32
)
for k = 0; k < len_; k++ {
in16 = int32(in[k])
out32 = (in16 << 12) - S[0]
out32 = SKP_RSHIFT_ROUND(out32, 12)
for d = 0; d < order-1; d++ {
S[d] = int32(uint32(S[d+1]) + uint32(SKP_SMULBB(in16, int32(B[d]))))
}
S[order-1] = SKP_SMULBB(in16, int32(B[order-1]))
out[k] = SKP_SAT16(out32)
}
}
func SKP_Silk_LPC_analysis_filter(in []int16, B []int16, S []int16, out []int16, len_ int32, Order int32) {
var (
k int32
j int32
idx int32
Order_half = Order >> 1
out32_Q12 int32
out32 int32
SA int16
SB int16
)
for k = 0; k < len_; k++ {
SA = S[0]
out32_Q12 = 0
for j = 0; j < (Order_half - 1); j++ {
idx = SKP_SMULBB(2, j) + 1
SB = S[idx]
S[idx] = SA
out32_Q12 = SKP_SMLABB(out32_Q12, int32(SA), int32(B[idx-1]))
out32_Q12 = SKP_SMLABB(out32_Q12, int32(SB), int32(B[idx]))
SA = S[idx+1]
S[idx+1] = SB
}
SB = S[Order-1]
S[Order-1] = SA
out32_Q12 = SKP_SMLABB(out32_Q12, int32(SA), int32(B[Order-2]))
out32_Q12 = SKP_SMLABB(out32_Q12, int32(SB), int32(B[Order-1]))
out32_Q12 = SKP_SUB_SAT32((int32(in[k]))<<12, out32_Q12)
out32 = SKP_RSHIFT_ROUND(out32_Q12, 12)
out[k] = SKP_SAT16(out32)
S[0] = in[k]
}
}