func main() {
sampleRate := 44100
blockSize := 205 * sampleRate / 8000
window := blockSize / 4
dt := dtmf.NewStandard(sampleRate, blockSize)
lastKey := -1
keyCount := 0
samples := make([]float32, blockSize)
if err := portaudio.Initialize(); err != nil {
log.Fatalf("Initialize: %+v", err)
}
defer func() {
if err := portaudio.Terminate(); err != nil {
log.Fatalf("Terminate: %+v", err)
}
}()
inputBuf := make([]float32, window)
stream, err := portaudio.OpenDefaultStream(1, 0, float64(sampleRate), len(inputBuf), inputBuf)
if err != nil {
log.Fatalf("OpenDefaultStream: %+v", err)
}
defer stream.Close()
if err := stream.Start(); err != nil {
log.Fatalf("Start: %+v", err)
}
defer stream.Stop()
fmt.Printf("%+v\n", stream.Info())
sig := make(chan os.Signal, 1)
signal.Notify(sig, os.Interrupt, os.Kill)
for {
if err := stream.Read(); err != nil {
log.Fatalf("Read: %+v", err)
}
copy(samples, samples[window:])
copy(samples[len(samples)-len(inputBuf):], inputBuf)
if k, t := dt.Feed(samples); k == lastKey && t > 0.0 {
keyCount++
if keyCount == 10 {
fmt.Printf("%c", dtmf.Keypad[k])
}
} else {
lastKey = k
keyCount = 0
}
select {
case <-sig:
fmt.Println()
return
default:
}
}
}
func main() {
sampleRate := 8000
blockSize := 205 * sampleRate / 8000
window := blockSize / 4
dt := dtmf.NewStandard(sampleRate, blockSize)
lastKey := -1
keyCount := 0
samples := make([]float32, blockSize)
rd := os.Stdin
if len(os.Args) > 1 && os.Args[1] != "-" {
fi, err := os.Open(os.Args[1])
if err != nil {
log.Fatal(err)
}
defer fi.Close()
rd = fi
}
buf := make([]byte, window*2)
for {
_, err := rd.Read(buf)
if err == io.EOF {
break
} else if err != nil {
log.Fatal(err)
}
copy(samples, samples[window:])
si := len(samples) - window
for i := 0; i < len(buf); i += 2 {
s := float32(int16(buf[i])|(int16(buf[i+1])<<8)) / 32768.0
samples[si] = s
si++
}
if k, t := dt.Feed(samples); k == lastKey && t > 0.0 {
keyCount++
if keyCount == 9 {
fmt.Printf("%c", dtmf.Keypad[k])
}
} else {
lastKey = k
keyCount = 0
}
}
fmt.Println()
}