android - 以 AMR 文件格式录制音频

Question

我想以 AMR 文件格式录制音频。我目前正在使用波纹管代码来录制音频:

outputFile = Environment.getExternalStorageDirectory().getAbsolutePath() + "Sample.3gp";

myRecorder = new MediaRecorder();
myRecorder.setAudioSource(MediaRecorder.AudioSource.MIC);
myRecorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);
myRecorder.setAudioEncoder(MediaRecorder.OutputFormat.AMR_NB);
myRecorder.setOutputFile(outputFile);

但它会生成 .3gp 文件。如何获取 .amr 文件？将输出文件更改为 Sample.amr 有效。但这是正确的方法吗？请帮助

编辑现在解决了

这是我的愚蠢错误:我使用了 myRecorder.setAudioEncoder(MediaRecorder.OutputFormat.AMR_NB);

应该是——

myRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);

所以下面的代码适用于以 AMR 格式录制:

outputFile = Environment.getExternalStorageDirectory().getAbsolutePath() + "Sample.amr";

    myRecorder = new MediaRecorder();
    myRecorder.setAudioSource(MediaRecorder.AudioSource.MIC);
    myRecorder.setOutputFormat(MediaRecorder.OutputFormat.AMR_NB);
    myRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);
    myRecorder.setOutputFile(outputFile);

Answer 1

引用android OutputFormat document试试下面的代码:

    Log.i(TAG,"Record start");
    String outputFile;
    MediaRecorder myRecorder;
    outputFile = Environment.getExternalStorageDirectory().getAbsolutePath() + "/" + "Sample.amr";
    Log.i(TAG,"file name: " + outputFile);

    myRecorder = new MediaRecorder();
    myRecorder.setAudioSource(MediaRecorder.AudioSource.MIC);
    myRecorder.setOutputFormat(MediaRecorder.OutputFormat.AMR_NB);
    myRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);
    myRecorder.setOutputFile(outputFile);

    try {
        myRecorder.prepare();
        myRecorder.start();
    } catch (IOException e) {
        e.printStackTrace();
    }
    try {
        Thread.sleep(30*1000);
    } catch (InterruptedException e) {
        e.printStackTrace();
    }
    myRecorder.stop();
    myRecorder.release();
    Log.i(TAG,"Record finished");

要点:

1. 输出文件名使用“.amr”后缀。输出格式使用 OutputFormat.AMR_NB 参数。
2. 编码器使用 AudioEncoder.AMR_NB参数。