Android音频录制乱码

Question

我们有一个长期运行的Android应用程序，可以在按下按钮时录制音频。全新安装后，录音按预期工作。

我让应用程序一夜之间运行，并在今天早上再次尝试录制。音频听起来像这样：

https://soundcloud.com/joe-mccall-7/our-android-app-one-through

我想也许应用程序让声音处理器处于奇怪的状态，所以我从Play商店安装了一个录音应用程序，这就是结果：

https://soundcloud.com/joe-mccall-7/audio-recorder-pro-one-through

切换回我们的应用并以相同的乱码音频录制结果。这是我们实例化录制对象的地方：

// the recording rate in samples per second (hz)
public static final int RECORDING_RATE = 11025;

// we will be recording and playing back as mono with PCM 16 bit encoding.
private static final int RECORDING_CHANNEL = AudioFormat.CHANNEL_IN_MONO;
private static final int ENCODING_FORMAT = AudioFormat.ENCODING_PCM_16BIT;

// the buffer size is determined by the recording rate, channel and format
private static int RECORDING_BUFFER_SIZE = AudioRecord.getMinBufferSize(
        RECORDING_RATE, RECORDING_CHANNEL, ENCODING_FORMAT) * 2;

// the audio recorder instance used for microphone input
private static AudioRecord recorder =
        new AudioRecord(MediaRecorder.AudioSource.MIC,
                RECORDING_RATE, RECORDING_CHANNEL, ENCODING_FORMAT,
                RECORDING_BUFFER_SIZE);

稍后在代码中我们有一个长时间运行的线程，它从记录器实例读取音频并将其写入BufferedOutputStream对象：

BufferedOutputStream bos = new BufferedOutputStream(new FileOutputStream(filename);

// as long as the user has not canceled the streaming...
while (transmitting) {

    // read the data into the buffer
    int read = recorder.read(buffer, 0, buffer.length);

    // write the buffer to the output stream
    bos.write(buffer);
}

// close the buffer and write the wav file

考虑到全新安装的应用程序记录了几个音频文件，我不知道wav文件的编写问题是怎么回事。

当我强制停止应用并再次启动时，录音恢复正常：

https://soundcloud.com/joe-mccall-7/force-stop-and-restart-one-through-ten

那么你的理论是什么会导致wav文件变得像那样乱码？