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java - AudioTrack 只播放噪音而不是录制的语音

问题描述

我想使用音轨播放录制的语音，但它会发出噪音我尝试了不同的技术但无法解决这个问题。我改变了：频率速率，音频格式通道音频格式编码

  public class PlayAudio extends AsyncTask<Void, Integer, Void> {
   
        PlayAudio playTask;
        String path = Environment.getExternalStorageDirectory().getAbsolutePath() + "/MyFolder/";
        String myfile = path + "filename" + ".wav";
        File recordingFile = new File(myfile);      
        boolean isRecording = false,isPlaying = false;
    
        int frequency = 44100   ,channelConfiguration = AudioFormat.CHANNEL_CONFIGURATION_MONO;
        int audioEncoding = AudioFormat.ENCODING_PCM_16BIT;
            @Override
            protected Void doInBackground(Void... params) {
                isPlaying = true;      
                int bufferSize = AudioTrack.getMinBufferSize(frequency,channelConfiguration,audioEncoding);
                short[] audiodata = new short[bufferSize / 4];        
                try {
                    DataInputStream dis = new DataInputStream(new BufferedInputStream(new FileInputStream(recordingFile)));
                    AudioTrack audioTrack = new AudioTrack(
                            AudioManager.STREAM_MUSIC, frequency,
                            channelConfiguration, audioEncoding, bufferSize,
                            AudioTrack.MODE_STREAM);        
                    audioTrack.play();
                    while (isPlaying && dis.available() > 0) {
                        int i = 0;
                        while (dis.available() > 0 && i < audiodata.length) {
                            audiodata[i] = dis.readShort();
                            i++;
                        }
                        audioTrack.write(audiodata, 0, audiodata.length);
                    }
                    dis.close();
    
               //     startPlaybackButton.setEnabled(false);
              //      stopPlaybackButton.setEnabled(true);
    
                } catch (Throwable t) {
                    Log.e("AudioTrack", "Playback Failed");
                }
                return null;
            }
        }

标签： javaandroidaudiotrack

解决方案

我不知道这是否是全部问题，但您的部分问题是您将 wav 文件视为所有音频数据。事实上，那里有相当数量的元数据。有关详细信息，请参阅http://soundfile.sapp.org/doc/WaveFormat/。

最安全的做法是解析文件直到找到数据块，然后读取数据块，然后停止（因为通常在数据块之后也有元数据。

这里有一些粗略的代码可以给你这个想法。

    try {
        byte[] buffer = new byte[1024];

        // First find the data chunk

        byte[] bytes = new byte[4];

        // Read first 4 bytes.
        // (Should be RIFF descriptor.)
        // Assume it's ok
        is.read(bytes);

        // First subchunk will always be at byte 12.
        // (There is no other dependable constant.)
        is.skip(8);

        for (;;) {
            // Read each chunk descriptor.
            if (is.read(bytes) < 0) {
                break;
            }

            String desc = new String(bytes, "US-ASCII");

            // Read chunk length.
            if (is.read(bytes) < 0) {
                break;
            }

            int dataLength = (
                    (bytes[0] & 0xFF) |
                            ((bytes[1] & 0xFF) << 8) |
                            ((bytes[2] & 0xFF) << 16) |
                            ((bytes[3] & 0xFF) << 24));

            long length = getUnsignedInt(dataLength);

            if (desc.equals("data")){
                // Read 'length' bytes

...

public static long getUnsignedInt(int x) {
        return x & 0x00000000ffffffffL;
}

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