Initial qiwei secondary development handoff

tools/audio/silkdecode/main.go

@@ -0,0 +1,85 @@
+package main
+
+import (
+	"bytes"
+	"encoding/binary"
+	"flag"
+	"fmt"
+	"io"
+	"os"
+	"path/filepath"
+	"strings"
+
+	silk "github.com/git-jiadong/go-silk"
+)
+
+const sampleRate = 24000
+
+func main() {
+	in := flag.String("in", "", "input .silk file")
+	out := flag.String("out", "", "output .wav file")
+	flag.Parse()
+	if strings.TrimSpace(*in) == "" || strings.TrimSpace(*out) == "" {
+		fatalf("missing -in or -out")
+	}
+	if err := decodeSilkToWav(*in, *out); err != nil {
+		fatalf("%v", err)
+	}
+}
+
+func fatalf(format string, args ...interface{}) {
+	_, _ = fmt.Fprintf(os.Stderr, format+"\n", args...)
+	os.Exit(1)
+}
+
+func decodeSilkToWav(inputPath string, outputPath string) error {
+	input, err := os.Open(inputPath)
+	if err != nil {
+		return fmt.Errorf("open silk failed: %w", err)
+	}
+	defer input.Close()
+	var pcm bytes.Buffer
+	writer := silk.NewWriter(&pcm)
+	writer.Decoder.SetSampleRate(sampleRate)
+	if _, err := io.Copy(writer, input); err != nil {
+		_ = writer.Close()
+		return fmt.Errorf("silk decode failed: %w", err)
+	}
+	if err := writer.Close(); err != nil {
+		return fmt.Errorf("silk decode close failed: %w", err)
+	}
+	if pcm.Len() == 0 {
+		return fmt.Errorf("silk decode returned empty pcm")
+	}
+	return writeWAV(outputPath, pcm.Bytes())
+}
+
+func writeWAV(path string, pcm []byte) error {
+	if err := os.MkdirAll(filepath.Dir(path), 0755); err != nil {
+		return err
+	}
+	file, err := os.Create(path)
+	if err != nil {
+		return fmt.Errorf("create wav failed: %w", err)
+	}
+	defer file.Close()
+	dataSize := uint32(len(pcm))
+	header := &bytes.Buffer{}
+	header.WriteString("RIFF")
+	_ = binary.Write(header, binary.LittleEndian, uint32(36)+dataSize)
+	header.WriteString("WAVEfmt ")
+	_ = binary.Write(header, binary.LittleEndian, uint32(16))
+	_ = binary.Write(header, binary.LittleEndian, uint16(1))
+	_ = binary.Write(header, binary.LittleEndian, uint16(1))
+	_ = binary.Write(header, binary.LittleEndian, uint32(sampleRate))
+	_ = binary.Write(header, binary.LittleEndian, uint32(sampleRate*2))
+	_ = binary.Write(header, binary.LittleEndian, uint16(2))
+	_ = binary.Write(header, binary.LittleEndian, uint16(16))
+	header.WriteString("data")
+	_ = binary.Write(header, binary.LittleEndian, dataSize)
+	if _, err := file.Write(header.Bytes()); err != nil {
+		return err
+	}
+	_, err = file.Write(pcm)
+	return err
+}