Android Studio中如何配置MediaRecorder以48KHz的WAV格式录制音频？

Question

So far I have this: With this code I can configure Media Recorder to record in 3gp, but i need to record in WAV for a later process.

private void setupMediaRecorder() {
    mediaRecorder = new MediaRecorder();
    mediaRecorder.setAudioSource(MediaRecorder.AudioSource.MIC);
    mediaRecorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);
    mediaRecorder.setAudioEncoder(MediaRecorder.OutputFormat.AMR_NB);
    mediaRecorder.setOutputFile(MainActivity.PATH_TEMP_RECORDING);
}

Answer 1

Found it. This configuration works:

    mediaRecorder = new MediaRecorder();
    mediaRecorder.setAudioSource(MediaRecorder.AudioSource.MIC);
    mediaRecorder.setOutputFormat(AudioFormat.ENCODING_PCM_16BIT);
    mediaRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.AAC);
    mediaRecorder.setAudioChannels(1);
    mediaRecorder.setAudioEncodingBitRate(128000);
    mediaRecorder.setAudioSamplingRate(48000);
    mediaRecorder.setOutputFile(MainActivity.PATH_TEMP_RECORDING);

Answer 2

The MediaRecorder do not let you record in the lossless format. Instead, AudioRecord is more low-level API for audio recording, while you need to write buffer code and filewriting code yourself. Here is a example of using AudioRecord to write into.pcm file. WAV is basically a container of PCM 2 . If you want to write into.wav, you need to write the header yourself, and here is an example of using AudioRecord to write into.wav.