49 lines
1.2 KiB
Go
49 lines
1.2 KiB
Go
package service
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import (
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"encoding/base64"
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"fmt"
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"strings"
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)
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func parseAudio(audioBase64 string, format string) (duration float64, err error) {
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audioData, err := base64.StdEncoding.DecodeString(audioBase64)
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if err != nil {
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return 0, fmt.Errorf("base64 decode error: %v", err)
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}
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var samplesCount int
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var sampleRate int
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switch format {
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case "pcm16":
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samplesCount = len(audioData) / 2 // 16位 = 2字节每样本
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sampleRate = 24000 // 24kHz
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case "g711_ulaw", "g711_alaw":
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samplesCount = len(audioData) // 8位 = 1字节每样本
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sampleRate = 8000 // 8kHz
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default:
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samplesCount = len(audioData) // 8位 = 1字节每样本
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sampleRate = 8000 // 8kHz
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}
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duration = float64(samplesCount) / float64(sampleRate)
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return duration, nil
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}
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func DecodeBase64AudioData(audioBase64 string) (string, error) {
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// 检查并移除 data:audio/xxx;base64, 前缀
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idx := strings.Index(audioBase64, ",")
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if idx != -1 {
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audioBase64 = audioBase64[idx+1:]
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}
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// 解码 Base64 数据
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_, err := base64.StdEncoding.DecodeString(audioBase64)
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if err != nil {
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return "", fmt.Errorf("base64 decode error: %v", err)
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}
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return audioBase64, nil
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}
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