feat: realtime

(cherry picked from commit d4966246e68dbdcdab45ec5c5141362834d74425)

service/audio.go

@@ -0,0 +1,31 @@
+package service
+
+import (
+	"encoding/base64"
+	"fmt"
+)
+
+func parseAudio(audioBase64 string, format string) (duration float64, err error) {
+	audioData, err := base64.StdEncoding.DecodeString(audioBase64)
+	if err != nil {
+		return 0, fmt.Errorf("base64 decode error: %v", err)
+	}
+
+	var samplesCount int
+	var sampleRate int
+
+	switch format {
+	case "pcm16":
+		samplesCount = len(audioData) / 2 // 16位 = 2字节每样本
+		sampleRate = 24000                // 24kHz
+	case "g711_ulaw", "g711_alaw":
+		samplesCount = len(audioData) // 8位 = 1字节每样本
+		sampleRate = 8000             // 8kHz
+	default:
+		samplesCount = len(audioData) // 8位 = 1字节每样本
+		sampleRate = 8000             // 8kHz
+	}
+
+	duration = float64(samplesCount) / float64(sampleRate)
+	return duration, nil
+}