App_V2.3/SourceCode/TextToSpeechService/GoogleSTTHubClient.cs

using System.Net;
using System.Net.Http.Headers;
using System.Text;

namespace TextToSpeechService;

public class GoogleSTTHubClient
{
    public HttpClient Client { get; private set; }

    public async Task Demo()
    {
        string inFile =AppDomain.CurrentDomain.BaseDirectory+ "/test/demo.wav";
        FileStream fs = new FileStream(inFile, FileMode.Open);
        byte[] voice = new byte[fs.Length];
        fs.Read(voice, 0, voice.Length);
        fs.Close();
        await Speech(voice);
    }
    public GoogleSTTHubClient(HttpClient httpClient)
    {
        httpClient.BaseAddress = new Uri("http://www.google.com/speech-api/v1/recognize?xjerr=1&client=chromium&lang=zh-CN&maxresults=1");
        //httpClient.DefaultRequestHeaders.Add("Accept", "application/vnd.github.v3+json");
        //httpClient.DefaultRequestHeaders.Add("User-Agent", "HttpClientFactory-Sample");
        //httpClient.DefaultRequestHeaders.Add("content-type", "audio/x-flac; rate=16000");
        Client = httpClient;
    }

    /// <summary>
    /// api调不通
    /// 新版本的API: api:地址： https://www.google.com/speech-api/v2/recognize?output=json&lang=en-us&key=yourkey
    /// URL路径： 之前的V1变成V2
    /// 参数： 新增output：输出类型，我们一般用json 新增KEY：需要去google注册帐号，申请apikey  其他的参数都能够继续使用
    /// 开源代码：http://src.chromium.org/viewvc/chrome/trunk/src/content/browser/speech/
    /// </summary>
    /// <param name="voice"></param>
    /// <returns></returns>
    public async Task<string> Speech(byte[] voice)
    {
        HttpContent content = new StreamContent(new MemoryStream(voice));
        content.Headers.ContentType = new MediaTypeHeaderValue("audio/x-flac; rate=8000");
        var result= await Client.PostAsync("",content);
        await using Stream responseStream = await result.Content.ReadAsStreamAsync();
        using StreamReader readStream = new StreamReader(responseStream, Encoding.UTF8);
        var text = await readStream.ReadToEndAsync();
        return text;
    }

    /// <summary>
    /// 调用google语音识别引擎
    /// </summary>
    /// <returns></returns>
    private string GoogleSTT(byte[] voice)
    {
        string result = string.Empty;
        try
        {
            //string inFile = "audio.wav";
            //FileStream fs = new FileStream(inFile, FileMode.Open);
            //byte[] voice = new byte[fs.Length];
            //fs.Read(voice, 0, voice.Length);
            //fs.Close();
            string url = "http://www.google.com/speech-api/v1/recognize?xjerr=1&client=chromium&lang=zh-CN";
            Uri uri = new Uri(url);
#pragma warning disable CS0618
            HttpWebRequest request = (HttpWebRequest)WebRequest.Create(uri);
#pragma warning restore CS0618
            request.Method = "POST";
            request.ContentType = "audio/x-flac; rate=16000";
            request.ContentLength = voice.Length;
            using (Stream writeStream = request.GetRequestStream())
            {
                writeStream.Write(voice, 0, voice.Length);
            }

            using (HttpWebResponse response = (HttpWebResponse)request.GetResponse())
            {
                using (Stream responseStream = response.GetResponseStream())
                {
                    using (StreamReader readStream = new StreamReader(responseStream, Encoding.UTF8))
                    {
                        result = readStream.ReadToEnd();
                    }
                }
            }
        }
        catch (Exception ex)
        {
            Console.WriteLine(ex.StackTrace);
        }
        return result;
    }

    
}