一、创建自己的语音识别应用
百度智能云控制台网址：https://console.bce.baidu.com/
1、创建应用
2、获取APIKey和SecretKey
3、Api调试
二、在Unity中进行调用
1、短语音识别标准版相关参数
2、完整代码
csharp
using System;
using System.Collections;
using System.Collections.Generic;
using System.Text;
using UnityEngine;
using UnityEngine.Networking;
using Newtonsoft.Json;
using UnityEngine.UI;
public class ASR : MonoBehaviour
{
[Header("百度语音识别配置")]
[SerializeField] private string apiKey = "LFfK6DTaswy6LLtBqvHO86w0";
[SerializeField] private string secretKey = "vj6JmKd7zBylDVGW2WmTNPWl9eKxxZEL";
[SerializeField] private string accessToken;
[Space]
[Header("短语音识别标准版参数设置")]
[SerializeField] private string format = "pcm";
[SerializeField] private int rate = 16000;
[SerializeField] private int channel = 1;
[SerializeField] private string cuid = "240a906f2b88794fd0426442c4136a5a57bf5c01";
[SerializeField] private int dev_pid = 1537;
[Space]
[Header("测试使用")]
public AudioSource audioSource;
[Space]
[Header("UI相关")]
public Button buttonStartASR;
public Button buttonRecord;
public Text textResult;
// Start is called before the first frame update
void Start()
{
//一开始就进行鉴权
StartCoroutine(GetAccessToken());
//开始识别
buttonStartASR.onClick.AddListener(() =>
{
print("开始识别");
StartCoroutine(RecognizeFromClip(audioSource.clip,
onSuccess => { textResult.text = onSuccess; },
onError => { Debug.Log(onError); }));
});
}
#region 短语音识别相关
/// <summary>
/// 短语音识别方法
/// </summary>
/// <param name="clip">待识别语音</param>
/// <param name="onSuccess">识别成功返回结果（文本）</param>
/// <param name="onError">识别成功返回问题</param>
/// <returns></returns>
public IEnumerator RecognizeFromClip(AudioClip clip, Action<string> onSuccess, Action<string> onError)
{
if (accessToken == null)
{
onError?.Invoke("accessToken未获取");
yield break;
}
// 转换 clip 为 PCM 数据（16bit）
byte[] pcmData = ConvertClipToPCM16(clip);
if (pcmData == null)
{
onError?.Invoke("音频格式错误或转换失败");
yield break;
}
string base64Audio = Convert.ToBase64String(pcmData);
var requestData = new
{
format = format,
rate = rate,
channel = channel,
cuid = cuid,
token = accessToken,
dev_pid = dev_pid,// 普通话输入法模型
speech = base64Audio,
len = pcmData.Length
};
string jsonBody = JsonConvert.SerializeObject(requestData);
using (UnityWebRequest request = new UnityWebRequest("https://vop.baidu.com/server_api", "POST"))
{
byte[] bodyRaw = Encoding.UTF8.GetBytes(jsonBody);
request.uploadHandler = new UploadHandlerRaw(bodyRaw);
request.downloadHandler = new DownloadHandlerBuffer();
request.SetRequestHeader("Content-Type", "application/json");
request.SetRequestHeader("Accept", "application/json");
yield return request.SendWebRequest();
if (request.result != UnityWebRequest.Result.Success)
{
onError?.Invoke("网络错误: " + request.error);
}
else
{
string responseText = request.downloadHandler.text;
Debug.Log("🎤 识别结果: " + responseText);
var result = JsonConvert.DeserializeObject<ASRResponse>(responseText);
if (result.err_no == 0)
onSuccess?.Invoke(string.Join("", result.result));
else
onError?.Invoke($"识别失败（错误码{result.err_no}）：{result.err_msg}");
}
}
}
/// <summary>
/// 语音格式转换方法，转为 PCM16 格式
/// </summary>
/// <param name="clip">需要转换的音频</param>
/// <returns>返回转换后的音频结果</returns>
// 将 AudioClip 转为 PCM16 格式
private byte[] ConvertClipToPCM16(AudioClip clip)
{
if (clip.channels != 1 || clip.frequency != 16000)
{
Debug.LogError("❌ 仅支持 16kHz 单通道音频");
return null;
}
float[] samples = new float[clip.samples];
clip.GetData(samples, 0);
byte[] pcm = new byte[samples.Length * 2]; // 16-bit = 2 bytes
for (int i = 0; i < samples.Length; i++)
{
short value = (short)(samples[i] * short.MaxValue);
byte[] bytes = BitConverter.GetBytes(value);
pcm[i * 2] = bytes[0];
pcm[i * 2 + 1] = bytes[1];
}
return pcm;
}
[Serializable]
public class ASRResponse
{
/// <summary>
/// 短文本语音识别返回结构
/// </summary>
public int err_no;
public string err_msg;
public string sn;
public string[] result;
}
#endregion
#region 鉴权相关
/// <summary>
/// 鉴权方法
/// </summary>
/// <returns></returns>
/// <summary>
/// 获取百度 AccessToken（已使用 using 自动释放资源）
/// </summary>
public IEnumerator GetAccessToken()
{
string url = "https://aip.baidubce.com/oauth/2.0/token";
WWWForm form = new WWWForm();
form.AddField("grant_type", "client_credentials");
form.AddField("client_id", apiKey);
form.AddField("client_secret", secretKey);
using (UnityWebRequest request = UnityWebRequest.Post(url, form))
{
yield return request.SendWebRequest();
if (request.result == UnityWebRequest.Result.Success)
{
try
{
var tokenResponse = JsonConvert.DeserializeObject<TokenResponse>(request.downloadHandler.text);
accessToken = tokenResponse.access_token;
Debug.Log("✅ 短语音识别获取 AccessToken 成功: " + accessToken);
}
catch (Exception ex)
{
Debug.LogError("❌ 短语音识别AccessToken 解析失败: " + ex.Message);
}
}
else
{
Debug.LogError("❌ 短语音识别获取 AccessToken 失败: " + request.error);
}
}
}
[Serializable]
public class TokenResponse
{
/// <summary>
/// 鉴权返回结构
/// </summary>
public string access_token;
}
#endregion
}3、实现效果
