如何使用 TarsosDSP 从文件中提取 MFCC 数据?

How do you extract MFCC data from file using TarsosDSP?

我基于这个 在 Stack Overflow 上创建了代码的 MFCC 提取部分,它创建了两个 AudioProcessor 实例。但是,使用 Android studio 上的调试器,我发现代码很快进入了 processingFinished 函数,同时跳过了两者的处理函数。在第二个 AudioProcessor 函数的 processingFinished 函数期间,实例中的 mfcc 变量保留为空。为什么数据从不处理?这是获得 MFCC 的正确方法吗?

我的源代码:(我将 AudioDispatcher 更改为从文件进行管道传输)

private void onMFCC() {

    int sampleRate = 44100;
    int bufferSize = 1024;
    int bufferOverlap = 128;
    //final AudioDispatcher dispatcher = AudioDispatcherFactory.fromDefaultMicrophone(22050,1024,512);
    String path = getExternalCacheDir().getAbsolutePath() + "/saytest.mp4";
    new AndroidFFMPEGLocator(this);
    final AudioDispatcher dispatcher = AudioDispatcherFactory.fromPipe(path, sampleRate, bufferSize, bufferOverlap);
    final MFCC mfcc = new MFCC(bufferSize, sampleRate, 40, 50, 300, 3000);

    dispatcher.addAudioProcessor(mfcc);
    dispatcher.addAudioProcessor(new AudioProcessor() {

        @Override
        public void processingFinished() {

            //vvv error b/c mfcc instance variable is null
            //float[] mfccArr = mfcc.getMFCC();  
            System.out.println("DONE");
        }

        @Override
        public boolean process(AudioEvent audioEvent) {
            // breakpoint or logging to console doesn't enter function
            return true;
        }
    });
    dispatcher.run();

}

是否有可能因为管道 AudioDispatcher 的错误与此有关?

Starting piped decoding process for /storage/emulated/0/Android/data/com.example.audiorecorder/cache/saytest.mp4
I/PipeDecoder:  with command: "/data/user/0/com.example.audiorecorder/cache/ffmpeg" -ss 0.0   -i "/storage/emulated/0/Android/data/com.example.audiorecorder/cache/saytest.mp4" -vn -ar 44100 -ac 1 -sample_fmt s16 -f s16le pipe:1
I/PipeDecoder: CANNOT LINK EXECUTABLE "/data/user/0/com.example.audiorecorder/cache/ffmpeg": /data/data/com.example.audiorecorder/cache/ffmpeg: has text relocations
I/PipeDecoder: Aborted 
I/PipeDecoder: Finished piped decoding process

如有任何帮助,我们将不胜感激。非常感谢!

编辑: 我尝试通过将此行添加到方法的末尾来独立调用流程函数:

mfcc.process(new AudioEvent(new TarsosDSPAudioFormat(sampleRate, bufferSize, 1, true, true)));

但是,这给了我一个 NullPointerException。

我解决了这个问题,因为我意识到调度程序 fromPipe 没有工作,所以我更换了调度程序:

InputStream inStream = new FileInputStream(path);
AudioDispatcher dispatcher = new AudioDispatcher(new UniversalAudioInputStream(inStream, new TarsosDSPAudioFormat(sampleRate, bufferSize, 1, true, true)), bufferSize, bufferOverlap);