https://github.com/shenjinti/dtmfdecoder

A pure Golang implementation of the DTMF detector
https://github.com/shenjinti/dtmfdecoder

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A pure Golang implementation of the DTMF detector

• Host: GitHub
• URL: https://github.com/shenjinti/dtmfdecoder
• Owner: shenjinti
• Created: 2024-09-25T06:59:01.000Z (4 months ago)
• Default Branch: main
• Last Pushed: 2024-09-25T07:10:18.000Z (4 months ago)
• Last Synced: 2024-11-10T17:11:50.812Z (2 months ago)
• Language: Go
• Size: 241 KB
• Stars: 0
• Watchers: 1
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md

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README

        
# A pure Golang implementation of the DTMF detector

> Ported from https://dtmf.netlify.app

## Usage

```shell

go get github.com/shenjinti/dtmfdecoder

```

## API

```go

type DTMFDecoder struct {

    // The minimum duration of a DTMF tone in seconds

    PressInterval time.Duration // default 200ms

}

func NewDTMFDecoder(pressInterval float64, sampleRate float64) *DTMFDecoder

```

### Example 

```go

decoder := dtmfdecoder.NewDTMFDecoder(0.32, 8000)

f, _ := os.Open("testdata/123456654321_8k_s16le.raw")

decoded := ""

for {

    data := make([]byte, 320) // 320 bytes = 160 samples = 20ms

    n, err := f.Read(data)

    if n == 0 || err != nil {

        break

    }

    samples := make([]float64, 0)

    for i := 0; i < n; i += 2 {

        sample := int16(data[i]) | int16(data[i+1])<<8

        samples = append(samples, float64(sample)/32768.0)

    }

    current, ok := decoder.Decode(samples)

    if ok {

        decoded += current

    }

}

t.Log("[123456654321_8k_s16le] Detected DTMF tone:", decoded)

if decoded != "123456654321" {

    t.Error("Expected 123456654321, got", decoded)

}

```

## Thanks to the original author for the code.

- https://github.com/Ravenstine/goertzeljs

- https://dtmf.netlify.app