如何将STT文件流式传输到IBM Watson(Unity)?

IBM Watson Unity SDK

web上有一些关于如何将文件发送到IBM Watson的示例。

但是没有确切的例子来说明如何将一个长文件分割成多个部分。所以我想做的是: 我有一个日志音频文件(约1-3分钟),并想把它发送给沃森,以识别语音。

IBM Watson只接受<5mb文件,但我的文件更大,所以我需要将其拆分并作为部分发送。

private void OnAudioLoaded (AudioClip clip)
{
    Debug.Log ("Audio was loaded and starting to stream...");
    _chunksCount = 0;

    float[] clipData = new float[(int)(clip.length * CHUNK_SIZE)];
    clip.GetData (clipData, 1);

    try {
        _speechToText.StartListening (OnRecognize);

        for (int i = 0; i < Math.Ceiling (clip.length / SECONDS_TO_SPLIT); i++) {
            Debug.Log ("Iteration of recognition #" + i);
            _chunksCount++;

            // creating array of floats from clip array
            float[] chunkData = new float[SECONDS_TO_SPLIT * (int)CHUNK_SIZE];
            Array.Copy (clipData, i * SECONDS_TO_SPLIT * (int)CHUNK_SIZE, chunkData, 0, clipData.Length - i * SECONDS_TO_SPLIT * CHUNK_SIZE < SECONDS_TO_SPLIT * CHUNK_SIZE ? (int)(clipData.Length - i * SECONDS_TO_SPLIT * CHUNK_SIZE) : SECONDS_TO_SPLIT * (int)CHUNK_SIZE);

            // creating audioclip from floats array
            AudioClip chunk = AudioClip.Create ("ch", clip.frequency * SECONDS_TO_SPLIT, clip.channels, clip.frequency, false);
            chunk.SetData (chunkData, 0);
            AudioData audioData = new AudioData (chunk, chunk.samples);

            // sending recognition request
            _speechToText.OnListen (audioData);
        }
    } catch (OutOfMemoryException e) {
        DialogBoxes.CallErrorBox ("Audio Recognition Error", e.Message);
    }
}

问题是:

_speechToText.StartListening (OnRecognize); 我在OnRecognize上分配了一个回调函数,该函数应该在识别出某个对象时调用,但从未调用过。

有什么建议吗?