main.go
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package main
import (
"bytes"
"encoding/binary"
sherpa "github.com/k2-fsa/sherpa-onnx-go/sherpa_onnx"
"github.com/youpy/go-wav"
"log"
"os"
"strings"
)
func main() {
log.SetFlags(log.LstdFlags | log.Lmicroseconds)
config := sherpa.OnlineRecognizerConfig{}
config.FeatConfig = sherpa.FeatureConfig{SampleRate: 16000, FeatureDim: 80}
// please download model files from
// https://github.com/k2-fsa/sherpa-onnx/releases/download/asr-models/sherpa-onnx-streaming-zipformer-ctc-small-2024-03-18.tar.bz2
config.ModelConfig.Zipformer2Ctc.Model = "./sherpa-onnx-streaming-zipformer-ctc-small-2024-03-18/ctc-epoch-30-avg-3-chunk-16-left-128.int8.onnx"
config.ModelConfig.Tokens = "./sherpa-onnx-streaming-zipformer-ctc-small-2024-03-18/tokens.txt"
config.ModelConfig.NumThreads = 1
config.ModelConfig.Debug = 0
config.ModelConfig.Provider = "cpu"
config.CtcFstDecoderConfig.Graph = "./sherpa-onnx-streaming-zipformer-ctc-small-2024-03-18/HLG.fst"
wav_filename := "./sherpa-onnx-streaming-zipformer-ctc-small-2024-03-18/test_wavs/8k.wav"
samples, sampleRate := readWave(wav_filename)
log.Println("Initializing recognizer (may take several seconds)")
recognizer := sherpa.NewOnlineRecognizer(&config)
log.Println("Recognizer created!")
defer sherpa.DeleteOnlineRecognizer(recognizer)
log.Println("Start decoding!")
stream := sherpa.NewOnlineStream(recognizer)
defer sherpa.DeleteOnlineStream(stream)
stream.AcceptWaveform(sampleRate, samples)
tailPadding := make([]float32, int(float32(sampleRate)*0.3))
stream.AcceptWaveform(sampleRate, tailPadding)
for recognizer.IsReady(stream) {
recognizer.Decode(stream)
}
log.Println("Decoding done!")
result := recognizer.GetResult(stream)
log.Println(strings.ToLower(result.Text))
log.Printf("Wave duration: %v seconds", float32(len(samples))/float32(sampleRate))
}
func readWave(filename string) (samples []float32, sampleRate int) {
file, _ := os.Open(filename)
defer file.Close()
reader := wav.NewReader(file)
format, err := reader.Format()
if err != nil {
log.Fatalf("Failed to read wave format")
}
if format.AudioFormat != 1 {
log.Fatalf("Support only PCM format. Given: %v\n", format.AudioFormat)
}
if format.NumChannels != 1 {
log.Fatalf("Support only 1 channel wave file. Given: %v\n", format.NumChannels)
}
if format.BitsPerSample != 16 {
log.Fatalf("Support only 16-bit per sample. Given: %v\n", format.BitsPerSample)
}
reader.Duration() // so that it initializes reader.Size
buf := make([]byte, reader.Size)
n, err := reader.Read(buf)
if n != int(reader.Size) {
log.Fatalf("Failed to read %v bytes. Returned %v bytes\n", reader.Size, n)
}
samples = samplesInt16ToFloat(buf)
sampleRate = int(format.SampleRate)
return
}
func samplesInt16ToFloat(inSamples []byte) []float32 {
numSamples := len(inSamples) / 2
outSamples := make([]float32, numSamples)
for i := 0; i != numSamples; i++ {
s := inSamples[i*2 : (i+1)*2]
var s16 int16
buf := bytes.NewReader(s)
err := binary.Read(buf, binary.LittleEndian, &s16)
if err != nil {
log.Fatal("Failed to parse 16-bit sample")
}
outSamples[i] = float32(s16) / 32768
}
return outSamples
}