在 api 中接受音频文件

Question

我正在尝试将我的 API 转换为接受音频文件而不是字符串，但在查看它之后我找不到合适的示例。

目前 Speech-To-Text 服务在本地运行，但我想将其移至服务器。我已经对 wit.ai 服务进行了 API 调用。剩下的就是让 API 接受一个音频文件（音频总是 .wav）

如果有人有一些建议，请告诉我我被困在这个问题上

[Produces("application/json")]
[Route("api")]
public class CommandApiController : Controller
{
    // constructor

    [HttpPost]
    public async Task<IActionResult> ProcessCommandAsync([FromBody]string command)
    {
        // Testing SpeechToText method
        string path = @"C:\Users\rickk\Desktop\SmartSpeaker\agenda.wav";
        // Overridden for now  
        command = await CovnvertSpeechToTextApiCall(new ByteArrayContent(System.IO.File.ReadAllBytes(path)));

        // Logic

    }


    async Task<string> CovnvertSpeechToTextApiCall(ByteArrayContent content)
    {
        var httpClient = new HttpClient();

        content.Headers.ContentType = MediaTypeHeaderValue.Parse("audio/wav");

        // Wit.ai server token
        httpClient.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("Bearer", Token);
        var httpResponseMessage = await httpClient.PostAsync("https://api.wit.ai/speech", content);
        if (httpResponseMessage.IsSuccessStatusCode)
        {
            var response = await httpResponseMessage.Content.ReadAsStringAsync();
            var modeldata = Newtonsoft.Json.JsonConvert.DeserializeObject<Model.DeserializedJsonDataModel>(response);

            return modeldata._text;
        }
        else
        {
            return null;
        }
    }
}

Answer 1

您可以使用 IFormFile 轻松地将文件上传到 Asp.net 核心 web api，如下所示，您在 post 操作中接受上一个类型的参数

    [HttpPost]
    public async Task<IActionResult> UploadAudioFile(IFormFile file)
    {
        /* 
         * the content types of Wav are many
         * audio/wave
         * audio/wav
         * audio/x-wav
         * audio/x-pn-wav
         * see "https://developer.mozilla.org/en-US/docs/Web/HTTP/Basics_of_HTTP/MIME_types"
        */
        if (file.ContentType != "audio/wave")
        {
            return BadRequest("Wrong file type");
        }
        var uploads = Path.Combine(HostingEnvironment.WebRootPath, "uploads");//uploads where you want to save data inside wwwroot
        var filePath = Path.Combine(uploads, file.FileName);
        using (var fileStream = new FileStream(filePath, FileMode.Create))
        {
            await file.CopyToAsync(fileStream);
        }
        return Ok("File uploaded successfully");
    }

您需要使用依赖注入在控制器构造函数中请求 IHostingEnvironment 对象，如下所示：

public FileController(IHostingEnvironment hostingEnvironment)
    {
        HostingEnvironment = hostingEnvironment;
    }

然后将其分配给控制器内的属性。

除此之外，不要忘记将来自客户端的请求以 Multipart 形式发送，如下所示（示例）：

Answer 2

感谢您的评论。

不完全是我想要的，但这是我没有正确解释的错。这是我找到的解决方案。

    [Produces("application/json")]
    [Route("api/audio")]
    [HttpPost]
    public async Task<IActionResult> ProcessCommandAsync([FromForm]IFormFile command)
    {  
        if(command.ContentType != "audio/wav" && command.ContentType != "audio/wave" || command.Length < 1)
        {
            return BadRequest();
        }
        var text = await CovnvertSpeechToTextApiCall(ConvertToByteArrayContent(command));

        return Ok(FormulateResponse(text));
    }


    private ByteArrayContent ConvertToByteArrayContent(IFormFile audofile)
    {
        byte[] data;

        using (var br = new BinaryReader(audofile.OpenReadStream()))
        {
            data = br.ReadBytes((int) audofile.OpenReadStream().Length);
        }

        return new ByteArrayContent(data);
    }