到HTTP无响应获取请求的WebAPI在.NET 4.5，而使用语音合成转换文本到语音 [英] No response to a HTTP Get request in WebAPI in .NET 4.5 while using SpeechSynthesis for converting text to speech

问题描述

我试图安装使用的WebAPI一个简单的Web服务。以下是我为code：

I'm trying to setup a simple web service using WebAPI. Here is what I have for code:

public class SpeakController : ApiController
    {
        //
        // api/speak

        public HttpResponseMessage Get(String textToConvert, String outputFile, string gender, string age = "Adult")
        {
            VoiceGender voiceGender = (VoiceGender)Enum.Parse(typeof(VoiceGender), gender);
            VoiceAge voiceAge = (VoiceAge)Enum.Parse(typeof(VoiceAge), age);

            using (SpeechSynthesizer synthesizer = new SpeechSynthesizer())
            {
                synthesizer.SelectVoiceByHints(voiceGender, voiceAge);
                synthesizer.SetOutputToWaveFile(outputFile, new SpeechAudioFormatInfo(8000, AudioBitsPerSample.Sixteen, AudioChannel.Mono));
                synthesizer.Speak(textToConvert);
            }

            return Request.CreateResponse(HttpStatusCode.OK, new Response { HttpStatusCode = (int)HttpStatusCode.OK, Message = "Payload Accepted." });
        }
    }

在code是相当简单的，它绝不是生产做好准备。但在我的测试中，我已经注意到了发生以下情况提出任何要求到控制器：

The code is fairly straight forward and it is by no means production ready. But in my tests I have noticed the following occurs for any request to the controller:

• 的WAV文件被成功生成


• 调试过程中，我可以看到控制敲回车键，退出该方法


• 然而，我的浏览器只是不断旋转，我从来没有从服务器
获得回应

我试图与邮差（REST客户端的浏览器）一样，得到了相同的结果。虽然我不希望这是一个阻塞调用，在尝试其他事情，我修改了兴趣 synthesizer.Speak 到 synthesizer.SpeakAsync 和遇到同样的问题。

I tried the same with Postman (a REST client for Chrome) and got the same result. Though I do want this to be a blocking call, in the interest of trying other things I modified synthesizer.Speak to synthesizer.SpeakAsync and encountered the same issue.

然而，当我单独测试片段如下图所示，在code正常工作。

However when I test the snippets separately as shown below, the code works as expected.

测试的WebAPI的呼叫与语音部注释掉：

public class SpeakController : ApiController
{
    //
    // api/speak

    public HttpResponseMessage Get(String textToConvert, String outputFile, string gender, string age = "Adult")
    {
        VoiceGender voiceGender = (VoiceGender)Enum.Parse(typeof(VoiceGender), gender);
        VoiceAge voiceAge = (VoiceAge)Enum.Parse(typeof(VoiceAge), age);

        //using (SpeechSynthesizer synthesizer = new SpeechSynthesizer())
        //{
        //  synthesizer.SelectVoiceByHints(voiceGender, voiceAge);
        //  synthesizer.SetOutputToWaveFile(outputFile, new SpeechAudioFormatInfo(8000, AudioBitsPerSample.Sixteen, AudioChannel.Mono));
        //  synthesizer.Speak(textToConvert);
        //}

        return Request.CreateResponse(HttpStatusCode.OK, new Response { HttpStatusCode = (int)HttpStatusCode.OK, Message = "Payload Accepted." });
    }
}

单独测试的讲话在控制台应用程序：

static string usageInfo = "Invalid or no input arguments!"
    + "\n\nUsage: initiatives \"text to speak\" c:\\path\\to\\generate.wav gender"
    + "\nGender:\n\tMale or \n\tFemale"
    + "\n";

static void Main(string[] args)
{
    if (args.Length != 3)
    {
        Console.WriteLine(usageInfo);
    }
    else
    {
        ConvertStringToSpeechWav(args[0], args[1], (VoiceGender)Enum.Parse(typeof(VoiceGender), args[2]));
    }

    Console.WriteLine("Press any key to continue...");
    Console.ReadLine();
}

static void ConvertStringToSpeechWav(String textToConvert, String pathToCreateWavFile, VoiceGender gender, VoiceAge age = VoiceAge.Adult)
{
    using (SpeechSynthesizer synthesizer = new SpeechSynthesizer())
    {
        synthesizer.SelectVoiceByHints(gender, age);
        synthesizer.SetOutputToWaveFile(pathToCreateWavFile, new SpeechAudioFormatInfo(8000, AudioBitsPerSample.Sixteen, AudioChannel.Mono));
        synthesizer.Speak(textToConvert);
    }
}

的WebAPI和语音合成似乎并没有发挥得很好。在弄清这一点任何帮助将大大AP preciated。

WebAPI and SpeechSynthesis do not seem to play well together. Any help in figuring this out would be greatly appreciated.

谢谢！

推荐答案

我不知道为什么发生这种情况，但在一个单独的线程中运行你的SpeechSynthesizer似乎这样的伎俩（不兼容的线程模型？）。下面是我如何在过去做到了。

I have no idea why this happens but running your SpeechSynthesizer in a separate thread seems to do the trick (incompatible threading model?). Here's how I've done it in the past.

根据<一个href=\"http://stackoverflow.com/questions/12343249/ultra-fast-text-to-speech-wav-mp3-in-asp-net-mvc\">Ultra快速文本到语音（WAV - ＆GT; MP3）在ASP.NET MVC

public dynamic Post(dynamic req)
{
    try 
    {
        string phrase = req["phrase"].Value;

        var stream = new MemoryStream();
        var t = new System.Threading.Thread(() =>
            {
                using (var synth = new SpeechSynthesizer())
                {
                    synth.SetOutputToWaveStream(stream);
                    synth.Speak(phrase);
                    synth.SetOutputToNull();
                }
            });

        t.Start();
        t.Join();

        stream.Position = 0;

        var resp = new HttpResponseMessage(HttpStatusCode.OK);
        resp.Content = new StreamContent(stream);

        resp.Content.Headers.ContentType = new MediaTypeHeaderValue("application/octet-stream");
        resp.Content.Headers.ContentDisposition = new System.Net.Http.Headers.ContentDispositionHeaderValue("attachment");
        resp.Content.Headers.ContentDisposition.FileName = "phrase.wav";

        return resp;
    }
    catch
    {
        return new HttpResponseMessage(HttpStatusCode.InternalServerError);
    }
}

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