/
fdaf.go
211 lines (175 loc) · 4.75 KB
/
fdaf.go
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package main
import (
"encoding/binary"
"flag"
"fmt"
"github.com/mjibson/go-dsp/fft"
"github.com/takuyaohashi/go-wav"
"github.com/tetsuzawa/converter"
utils2 "github.com/tetsuzawa/go-3daudio/web-app/utils"
"log"
"math/cmplx"
"os"
"path/filepath"
"reflect"
"strconv"
)
func ExtractFileName(path string) string {
return filepath.Base(path[:len(path)-len(filepath.Ext(path))])
}
func unset(s []float64, i int) []float64 {
if i >= len(s) {
return s
}
return append(s[:i], s[i+1:]...)
}
func fdaf(data []float64, mu float64, L int) []float64 {
// 1 w(o). random value. use as vector.
var w = make([]float64, 2*L)
// output buffer
var err_buf = make([]float64, 0)
var u = make([]float64, 2*L)
var zeros = make([]float64, L)
var idx int
Y := make([]complex128, 2*L)
y := make([]float64, L)
e := make([]float64, L)
EU := make([]complex128, 2*L)
FDAF:
for {
fmt.Printf("Filter adapting... %d%% \r", (idx+1)*100/len(data))
// 2.0 Initialize phi = 0s
// 2.1 Iterate for i = 0, 1, 2, 3, ..., L-1 (k is the block index)
for j := 0; j < L; j++ {
// 2.1.0 Read/generate a new data pair
in := data[idx]
if idx == len(data)-1 {
//fmt.Println(w[:L])
fmt.Printf("\nAdaptation completed!!\n")
break FDAF
}
u = unset(u, 0)
u = append(u, in)
j++
idx++
}
// 1 compute the output of the filter for the block kM, ..., KM + M -1
W := fft.FFT(converter.Float64sToComplex128s(append(w[:L], zeros...)))
U := fft.FFT(converter.Float64sToComplex128s(u))
for i := 0; i < 2*L; i++ {
Y[i] = W[i] * U[i]
}
y_raw := fft.IFFT(Y)[L:]
for i := 0; i < L; i++ {
y[i] = real(y_raw[i])
e[i] = u[i] - y[i]
}
// 2 compute the correlation vector
aux1 := fft.FFT(converter.Float64sToComplex128s(append(zeros, e...)))
aux2 := fft.FFT(converter.Float64sToComplex128s(u))
for i := 0; i < 2*L; i++ {
EU[i] = aux1[i] * cmplx.Conj(aux2[i])
}
phi := fft.IFFT(EU)[:L]
// 3 update the parameters of the filter
aux1 = fft.FFT(converter.Float64sToComplex128s(append(w[:L], zeros...)))
aux2 = fft.FFT(append(phi, converter.Float64sToComplex128s(zeros)...))
for i := 0; i < 2*L; i++ {
W[i] = aux1[i] + complex(mu, 0)*aux2[i]
}
aux3 := fft.IFFT(W)
for i := 0; i < 2*L; i++ {
w[i] = real(aux3[i])
}
// Judge divergence
if e[0] > 100000 {
log.Fatalln("ERROR: filter divergence occur. \nPlease reconsider stepsize:mu and filter length:L.")
}
err_buf = append(err_buf, e...)
}
return err_buf
}
func main() {
utils2.LoggingSettings("fdaf.log")
flag.Parse()
fileName := flag.Arg(0)
f, err := os.Open(fileName)
if err != nil {
log.Fatalln(err)
}
defer f.Close()
// ADF Parameter
var mu float64
var L int
mu, err = strconv.ParseFloat(flag.Arg(1), 64)
if err != nil {
log.Fatalln(err)
}
L, err = strconv.Atoi(flag.Arg(2))
if err != nil {
log.Fatalln(err)
}
fmt.Printf("Filter stepsize mu: %v, Filter length L: %v\n", mu, L)
w, err := wav.NewReader(f)
if err != nil {
log.Fatalln(err)
}
fmt.Println("Analize following file:", fileName)
fmt.Println("Channels:", w.GetNumChannels())
fmt.Println("Bits per samples:", w.GetBitsPerSample())
fmt.Println("Block align:", w.GetBlockAlign())
fmt.Println("Data chunk size:", w.GetSubChunkSize())
fmt.Println("Audio format:", w.GetAudioFormat().String())
fmt.Println("Byte rate:", w.GetByteRate())
fmt.Println("Sample rate:", w.GetSampleRate())
var data interface{}
data, err = w.ReadSamples(int(w.GetSubChunkSize()) / int(w.GetNumChannels()) / int(w.GetBlockAlign()))
if err != nil {
log.Fatalln(err)
}
if reflect.TypeOf(data) != reflect.TypeOf([]int16{0,}) {
log.Fatalln(err)
}
value, ok := data.([]int16)
fmt.Println("len", len(value))
if !ok {
log.Fatalln("Data type is not valid")
}
estErr := fdaf(converter.Int16sToFloat64s(value), mu, L)
inFileName := ExtractFileName(fileName)
wav_out_dir := "/Users/tetsu/personal_files/Research/filters/test/FDAF_wav/"
wav_out_name := fmt.Sprintf("%s_mu-%f_L-%d.wav", inFileName, mu, L)
fw, err := os.Create(wav_out_dir + wav_out_name)
if err != nil {
log.Fatalln(err)
}
defer fw.Close()
p := wav.WriterParam{
SampleRate: 48000,
BitsPerSample: 16,
NumChannels: 1,
AudioFormat: 1,
}
ww, err := wav.NewWriter(fw, p)
if err != nil {
log.Fatalln(err)
}
defer ww.Close()
ww.WriteSamples(converter.Float64sToInt16s(estErr))
b := make([]byte, 2)
buf := make([]byte, 0)
for i, v := range value {
fmt.Printf("Writing data to buffer... %d%%\r", (i+1)*100/len(value))
ui := converter.Int16ToUint16(v)
binary.LittleEndian.PutUint16(b, ui)
buf = append(buf, b...)
}
fmt.Printf("\nWriting completed!!\n")
_, err = fw.Write(buf)
if err != nil {
log.Fatalln(err)
}
fmt.Printf("\n")
fmt.Println("Filtered data is saved at:", wav_out_dir+wav_out_name)
fmt.Println("end!!")
}