带有Microsoft Cognitive Services的ASP.NET Web API中的文本翻译语音

Question

我正在开发Xamarin Mobile App使用的Web API。 Web API用于使用Microsoft Cognitive Services将语音转换为文本。该方法的输入是字节数组，它是一个简短的语音。我需要将其转换为文本并返回到移动应用

尝试了一些Speech SDK示例，但它们对我的要求没有帮助。

//In API Method
TranslateSpeechFromFileToText(filebytes).Wait();

////    
public static async Task TranslateSpeechFromFileToText(byte[] bytes)
{
    string fromLanguage = "en-US";
    var config = SpeechTranslationConfig.FromSubscription("My Subscriber key", "region");
    config.SpeechRecognitionLanguage = fromLanguage;
    config.AddTargetLanguage("de");
    var stopTranslation = new TaskCompletionSource<int>();
    StringBuilder opt = new StringBuilder();
    using (var audioInput = Helper.getConfigFromBytes(bytes))
    {
        using (var recognizer = new TranslationRecognizer(config, audioInput))
        {
            var result = await recognizer.RecognizeOnceAsync();
        }
    }
}


public class Helper
{
    public static AudioConfig OpenWavFile(string filename)
    {
        BinaryReader reader = new BinaryReader(File.OpenRead(filename));
        return OpenWavFile(reader);
    }

    public static AudioConfig OpenWavFile(BinaryReader reader)
    {
        AudioStreamFormat format = readWaveHeader(reader);
        return AudioConfig.FromStreamInput(new BinaryAudioStreamReader(reader), format);
    }

    public static AudioStreamFormat readWaveHeader(BinaryReader reader)
    {
        // Tag "RIFF"
        char[] data = new char[4];
        reader.Read(data, 0, 4);
        Trace.Assert((data[0] == 'R') && (data[1] == 'I') && (data[2] == 'F') && (data[3] == 'F'), "Wrong wav header");

        // Chunk size
        long fileSize = reader.ReadInt32();

        // Subchunk, Wave Header
        // Subchunk, Format
        // Tag: "WAVE"
        reader.Read(data, 0, 4);
        Trace.Assert((data[0] == 'W') && (data[1] == 'A') && (data[2] == 'V') && (data[3] == 'E'), "Wrong wav tag in wav header");

        // Tag: "fmt"
        reader.Read(data, 0, 4);
        Trace.Assert((data[0] == 'f') && (data[1] == 'm') && (data[2] == 't') && (data[3] == ' '), "Wrong format tag in wav header");

        // chunk format size
        var formatSize = reader.ReadInt32();
        var formatTag = reader.ReadUInt16();
        var channels = reader.ReadUInt16();
        var samplesPerSecond = reader.ReadUInt32();
        var avgBytesPerSec = reader.ReadUInt32();
        var blockAlign = reader.ReadUInt16();
        var bitsPerSample = reader.ReadUInt16();

        // Until now we have read 16 bytes in format, the rest is cbSize and is ignored for now.
        if (formatSize > 16)
            reader.ReadBytes((int)(formatSize - 16));

        // Second Chunk, data
        // tag: data.
        reader.Read(data, 0, 4);
        Trace.Assert((data[0] == 'd') && (data[1] == 'a') && (data[2] == 't') && (data[3] == 'a'), "Wrong data tag in wav");
        // data chunk size
        int dataSize = reader.ReadInt32();

        // now, we have the format in the format parameter and the
        // reader set to the start of the body, i.e., the raw sample data
        return AudioStreamFormat.GetWaveFormatPCM(samplesPerSecond, (byte)bitsPerSample, (byte)channels);
    }

    public static AudioConfig getConfigFromBytes(byte[] bytes)
    {
        using (MemoryStream ms = new MemoryStream(bytes))
        using (BinaryReader binaryReader = new BinaryReader(ms))
            return OpenWavFile(binaryReader);
    }
}

public sealed class BinaryAudioStreamReader : PullAudioInputStreamCallback
{
    private System.IO.BinaryReader _reader;

    /// <summary>
    /// Creates and initializes an instance of BinaryAudioStreamReader.
    /// </summary>
    /// <param name="reader">The underlying stream to read the audio data from. Note: The stream contains the bare sample data, not the container (like wave header data, etc).</param>
    public BinaryAudioStreamReader(System.IO.BinaryReader reader)
    {
        _reader = reader;
    }

    /// <summary>
    /// Creates and initializes an instance of BinaryAudioStreamReader.
    /// </summary>
    /// <param name="stream">The underlying stream to read the audio data from. Note: The stream contains the bare sample data, not the container (like wave header data, etc).</param>
    public BinaryAudioStreamReader(System.IO.Stream stream)
        : this(new System.IO.BinaryReader(stream))
    {
    }

    /// <summary>
    /// Reads binary data from the stream.
    /// </summary>
    /// <param name="dataBuffer">The buffer to fill</param>
    /// <param name="size">The size of data in the buffer.</param>
    /// <returns>The number of bytes filled, or 0 in case the stream hits its end and there is no more data available.
    /// If there is no data immediate available, Read() blocks until the next data becomes available.</returns>
    public override int Read(byte[] dataBuffer, uint size)
    {
        return _reader.Read(dataBuffer, 0, (int)size);
    }

    /// <summary>
    /// This method performs cleanup of resources.
    /// The Boolean parameter <paramref name="disposing"/> indicates whether the method is called from <see cref="IDisposable.Dispose"/> (if <paramref name="disposing"/> is true) or from the finalizer (if <paramref name="disposing"/> is false).
    /// Derived classes should override this method to dispose resource if needed.
    /// </summary>
    /// <param name="disposing">Flag to request disposal.</param>
    protected override void Dispose(bool disposing)
    {
        if (disposed)
        {
            return;
        }

        if (disposing)
        {
            _reader.Dispose();
        }

        disposed = true;
        base.Dispose(disposing);
    }


    private bool disposed = false;
}

我需要文本回复，但我在这里遇到的错误是：

  

System.Objectdisposed异常：无法访问BinaryAudioStreamReader类的Read方法中_Reader.Read（）处的关闭文件。