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SKP_Silk_resampler.go
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SKP_Silk_resampler.go
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package silk
import "unsafe"
func gcd(a int32, b int32) int32 {
var tmp int32
for b > 0 {
tmp = a - b*(a/b)
a = b
b = tmp
}
return a
}
func SKP_Silk_resampler_init(S *SKP_Silk_resampler_state_struct, Fs_Hz_in int32, Fs_Hz_out int32) int32 {
var (
cycleLen int32
cyclesPerBatch int32
up2 int32 = 0
down2 int32 = 0
)
memset(unsafe.Pointer(S), 0, size_t(unsafe.Sizeof(SKP_Silk_resampler_state_struct{})))
if Fs_Hz_in < 8000 || Fs_Hz_in > 192000 || Fs_Hz_out < 8000 || Fs_Hz_out > 192000 {
return -1
}
if Fs_Hz_in > 96000 {
S.NPreDownsamplers = 2
S.Down_pre_function = SKP_Silk_resampler_private_down4
} else if Fs_Hz_in > 48000 {
S.NPreDownsamplers = 1
S.Down_pre_function = SKP_Silk_resampler_down2
} else {
S.NPreDownsamplers = 0
S.Down_pre_function = nil
}
if Fs_Hz_out > 96000 {
S.NPostUpsamplers = 2
S.Up_post_function = SKP_Silk_resampler_private_up4
} else if Fs_Hz_out > 48000 {
S.NPostUpsamplers = 1
S.Up_post_function = SKP_Silk_resampler_up2
} else {
S.NPostUpsamplers = 0
S.Up_post_function = nil
}
if S.NPreDownsamplers+S.NPostUpsamplers > 0 {
S.Ratio_Q16 = ((Fs_Hz_out << 13) / Fs_Hz_in) << 3
for SKP_SMULWW(S.Ratio_Q16, Fs_Hz_in) < Fs_Hz_out {
S.Ratio_Q16++
}
S.BatchSizePrePost = Fs_Hz_in / 100
Fs_Hz_in = Fs_Hz_in >> S.NPreDownsamplers
Fs_Hz_out = Fs_Hz_out >> S.NPostUpsamplers
}
S.BatchSize = Fs_Hz_in / 100
if (S.BatchSize*100) != Fs_Hz_in || Fs_Hz_in%100 != 0 {
cycleLen = Fs_Hz_in / gcd(Fs_Hz_in, Fs_Hz_out)
cyclesPerBatch = RESAMPLER_MAX_BATCH_SIZE_IN / cycleLen
if cyclesPerBatch == 0 {
S.BatchSize = RESAMPLER_MAX_BATCH_SIZE_IN
} else {
S.BatchSize = cyclesPerBatch * cycleLen
}
}
if Fs_Hz_out > Fs_Hz_in {
if Fs_Hz_out == (Fs_Hz_in * 2) {
S.Resampler_function = SKP_Silk_resampler_private_up2_HQ_wrapper
} else {
S.Resampler_function = SKP_Silk_resampler_private_IIR_FIR
up2 = 1
if Fs_Hz_in > 24000 {
S.Up2_function = SKP_Silk_resampler_up2
} else {
S.Up2_function = SKP_Silk_resampler_private_up2_HQ
}
}
} else if Fs_Hz_out < Fs_Hz_in {
if (Fs_Hz_out * 4) == (Fs_Hz_in * 3) {
S.FIR_Fracs = 3
S.Coefs = &SKP_Silk_Resampler_3_4_COEFS[0]
S.Resampler_function = SKP_Silk_resampler_private_down_FIR
} else if (Fs_Hz_out * 3) == (Fs_Hz_in * 2) {
S.FIR_Fracs = 2
S.Coefs = &SKP_Silk_Resampler_2_3_COEFS[0]
S.Resampler_function = SKP_Silk_resampler_private_down_FIR
} else if (Fs_Hz_out * 2) == Fs_Hz_in {
S.FIR_Fracs = 1
S.Coefs = &SKP_Silk_Resampler_1_2_COEFS[0]
S.Resampler_function = SKP_Silk_resampler_private_down_FIR
} else if (Fs_Hz_out * 8) == (Fs_Hz_in * 3) {
S.FIR_Fracs = 3
S.Coefs = &SKP_Silk_Resampler_3_8_COEFS[0]
S.Resampler_function = SKP_Silk_resampler_private_down_FIR
} else if (Fs_Hz_out * 3) == Fs_Hz_in {
S.FIR_Fracs = 1
S.Coefs = &SKP_Silk_Resampler_1_3_COEFS[0]
S.Resampler_function = SKP_Silk_resampler_private_down_FIR
} else if (Fs_Hz_out * 4) == Fs_Hz_in {
S.FIR_Fracs = 1
down2 = 1
S.Coefs = &SKP_Silk_Resampler_1_2_COEFS[0]
S.Resampler_function = SKP_Silk_resampler_private_down_FIR
} else if (Fs_Hz_out * 6) == Fs_Hz_in {
S.FIR_Fracs = 1
down2 = 1
S.Coefs = &SKP_Silk_Resampler_1_3_COEFS[0]
S.Resampler_function = SKP_Silk_resampler_private_down_FIR
} else if (Fs_Hz_out * 441) == (Fs_Hz_in * 80) {
S.Coefs = &SKP_Silk_Resampler_80_441_ARMA4_COEFS[0]
S.Resampler_function = SKP_Silk_resampler_private_IIR_FIR
} else if (Fs_Hz_out * 441) == (Fs_Hz_in * 120) {
S.Coefs = &SKP_Silk_Resampler_120_441_ARMA4_COEFS[0]
S.Resampler_function = SKP_Silk_resampler_private_IIR_FIR
} else if (Fs_Hz_out * 441) == (Fs_Hz_in * 160) {
S.Coefs = &SKP_Silk_Resampler_160_441_ARMA4_COEFS[0]
S.Resampler_function = SKP_Silk_resampler_private_IIR_FIR
} else if (Fs_Hz_out * 441) == (Fs_Hz_in * 240) {
S.Coefs = &SKP_Silk_Resampler_240_441_ARMA4_COEFS[0]
S.Resampler_function = SKP_Silk_resampler_private_IIR_FIR
} else if (Fs_Hz_out * 441) == (Fs_Hz_in * 320) {
S.Coefs = &SKP_Silk_Resampler_320_441_ARMA4_COEFS[0]
S.Resampler_function = SKP_Silk_resampler_private_IIR_FIR
} else {
S.Resampler_function = SKP_Silk_resampler_private_IIR_FIR
up2 = 1
if Fs_Hz_in > 24000 {
S.Up2_function = SKP_Silk_resampler_up2
} else {
S.Up2_function = SKP_Silk_resampler_private_up2_HQ
}
}
} else {
S.Resampler_function = SKP_Silk_resampler_private_copy
}
S.Input2x = up2 | down2
S.InvRatio_Q16 = ((Fs_Hz_in << (up2 + 14 - down2)) / Fs_Hz_out) << 2
for SKP_SMULWW(S.InvRatio_Q16, Fs_Hz_out<<down2) < (Fs_Hz_in << up2) {
S.InvRatio_Q16++
}
S.Magic_number = 0x75BCD15
return 0
}
func SKP_Silk_resampler_clear(S *SKP_Silk_resampler_state_struct) int32 {
memset(unsafe.Pointer(&S.SDown2[0]), 0, size_t(unsafe.Sizeof([2]int32{})))
memset(unsafe.Pointer(&S.SIIR[0]), 0, size_t(unsafe.Sizeof([6]int32{})))
memset(unsafe.Pointer(&S.SFIR[0]), 0, size_t(unsafe.Sizeof([16]int32{})))
memset(unsafe.Pointer(&S.SDownPre[0]), 0, size_t(unsafe.Sizeof([2]int32{})))
memset(unsafe.Pointer(&S.SUpPost[0]), 0, size_t(unsafe.Sizeof([2]int32{})))
return 0
}
func SKP_Silk_resampler(S *SKP_Silk_resampler_state_struct, out []int16, in []int16, inLen int) int32 {
if S.Magic_number != 0x75BCD15 {
return -1
}
if S.NPreDownsamplers+S.NPostUpsamplers > 0 {
var (
nSamplesIn int32
nSamplesOut int32
in_buf [480]int16
out_buf [480]int16
)
for inLen > 0 {
if inLen < S.BatchSizePrePost {
nSamplesIn = inLen
} else {
nSamplesIn = S.BatchSizePrePost
}
nSamplesOut = SKP_SMULWB(S.Ratio_Q16, nSamplesIn)
if S.NPreDownsamplers > 0 {
S.Down_pre_function(&S.SDownPre[0], &in_buf[0], &in[0], nSamplesIn)
if S.NPostUpsamplers > 0 {
S.Resampler_function(S, out_buf, in_buf, nSamplesIn>>S.NPreDownsamplers)
S.Up_post_function(&S.SUpPost[0], &out[0], &out_buf[0], nSamplesOut>>S.NPostUpsamplers)
} else {
S.Resampler_function(S, out, in_buf, nSamplesIn>>S.NPreDownsamplers)
}
} else {
S.Resampler_function(S, out_buf, in, nSamplesIn>>S.NPreDownsamplers)
S.Up_post_function(&S.SUpPost[0], out, out_buf, nSamplesOut>>S.NPostUpsamplers)
}
in += ([]int16)(nSamplesIn)
out += ([]int16)(nSamplesOut)
inLen -= nSamplesIn
}
} else {
S.Resampler_function(S, out, in, inLen)
}
return 0
}