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conversion.go
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conversion.go
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package dsp
// Ui8toi16 converts and scales unsigned 8-bit samples to 16-bit signed samples.
func Ui8toi16(input []byte, output []int16)
func ui8toi16(input []byte, output []int16) {
n := len(output)
if len(input) < n {
n = len(input)
}
for i, v := range input[:n] {
v -= 128
v16 := int16((uint16(v) << 8) | uint16(v))
output[i] = v16
}
}
// Ui8toi16b converts and scales unsigned 8-bit samples to 16-bit signed samples.
func Ui8toi16b(input, output []byte)
func ui8toi16b(input, output []byte) {
n := len(output) / 2
if len(input) < n {
n = len(input)
}
for i, v := range input[:n] {
v -= 128
output[i*2] = v
output[i*2+1] = v
}
}
// Ui8tof32 converts unsigned 8-bit samples to 32-bit float.
// It does not scale the samples.
func Ui8tof32(input []byte, output []float32)
func ui8tof32(input []byte, output []float32) {
n := len(input)
if len(output) < n {
n = len(output)
}
for i, v := range input[:n] {
output[i] = float32(int(v) - 128)
}
}
// I8tof32 converts signed 8-bit samples to 32-bit float.
// It does not scale the samples.
func I8tof32(input []byte, output []float32)
func i8tof32(input []byte, output []float32) {
n := len(input)
if len(output) < n {
n = len(output)
}
for i, v := range input[:n] {
output[i] = float32(int8(v))
}
}
// Ui8toc64 converts unsigned 8-bit interleaved complex samples to 32-bit float.
// It does not scale the samples.
func Ui8toc64(input []byte, output []complex64)
func ui8toc64(input []byte, output []complex64) {
n := len(input) / 2
if len(output) < n {
n = len(output)
}
for i := 0; i < n; i++ {
output[i] = complex(
float32(int(input[i*2])-128),
float32(int(input[i*2+1])-128),
)
}
}
// F32toi16 converts scaled 32-bit floats to 16-bit integers.
func F32toi16(input []float32, output []int16, scale float32)
func f32toi16(input []float32, output []int16, scale float32) {
n := len(output)
if len(input) < n {
n = len(input)
}
for i, v := range input[:n] {
output[i] = int16(v * scale)
}
}
// F32toi16ble converts float32 to int16 stored in a byte slice. The values
// are stored in little-endian.
func F32toi16ble(input []float32, output []byte, scale float32)
func f32toi16ble(input []float32, output []byte, scale float32) {
n := len(output) / 2
if len(input) < n {
n = len(input)
}
for i, v := range input[:n] {
v := uint16(int16(v * scale))
output[i*2] = uint8(v & 0xff)
output[i*2+1] = uint8(v >> 8)
}
}
// I16bleToF64 converts int16 stored in a byte slice as little endian to float64.
func I16bleToF64(input []byte, output []float64, scale float64)
func i16bleToF64(input []byte, output []float64, scale float64) {
n := len(input) / 2
if len(output) < n {
n = len(output)
}
for i := range output[:n] {
output[i] = float64(int16(uint16(input[i*2])|(uint16(input[i*2+1])<<8))) * scale
}
}
// I16bleToF32 converts int16 stored in a byte slice as little endian to float64.
func I16bleToF32(input []byte, output []float32, scale float32)
func i16bleToF32(input []byte, output []float32, scale float32) {
n := len(input) / 2
if len(output) < n {
n = len(output)
}
for i := range output[:n] {
output[i] = float32(int16(uint16(input[i*2])|(uint16(input[i*2+1])<<8))) * scale
}
}