从 iOS 上传的音频无法在 android 上播放，反之亦然

Question

I am building a chat app in which users can upload audio too on Firebase Storage. But the audios uploaded from android are only playable on android and the audios uploaded from iOS are only playable on iOS. On the Android side, I am getting this exception while playing iOS audio:

java.io.IOException: Prepare failed.: status=0x1

This is the code I am using to upload audio from the android side:

private void startRecording() {
    try {
        String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss").format(new Date());
        String imageFileName = "AroundEU_media_" + timeStamp + "_";
        File storageDir = getExternalFilesDir(Environment.DIRECTORY_PICTURES);
        File image = File.createTempFile(
                imageFileName,
                ".3gp",
                storageDir
        );

        fileName = image.getAbsolutePath();

        recorder = new MediaRecorder();
        recorder.setAudioSource(MediaRecorder.AudioSource.MIC);
        recorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);
        recorder.setOutputFile(fileName);
        recorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);

        try {
            recorder.prepare();
        } catch (IOException e) {
            Log.e("Recording_Tag", "prepare() failed");
        }

        recorder.start();
    }catch (Exception e){
        Toast.makeText(this, ""+e.getMessage(), Toast.LENGTH_SHORT).show();
    }
}

private void stopRecording() {
    try {
        if (recorder!=null){
            recorder.stop();
            recorder.release();
            recorder = null;

            uploadAudio();

        }
    }catch (Exception e){
        Toast.makeText(this, "Tap and hold to record !", Toast.LENGTH_SHORT).show();
    }

}

And the code for playing audio on android side is:

try {
    Uri uri = Uri.parse(messageModelList.get(position).getAudio());
    MediaPlayer player = new MediaPlayer();
    player.setAudioStreamType(AudioManager.STREAM_MUSIC);
    player.setDataSource(context, uri);
    player.prepare();
    player.start();
} catch(Exception e) {
    System.out.println(e.toString());
}

I have searched a lot but could not find a proper solution. So please help me out to solve this problem.

Answer 1

You seem to be playing the audio from a URL. For playing audio from a URL it takes some time to prepare but you playing that immediately that causing the problem. You need to prepare it asynchronously and play it when it's prepared.

Here's an example of how to do it.

MediaPlayer mediaPlayer = new MediaPlayer();

mediaPlayer.setOnPreparedListener(player -> {

    player.start();

});

try {

    mediaPlayer.setDataSource(/*Audio Url*/);
    mediaPlayer.prepareAsync();

} catch (Exception exception) {

    Timber.d("Error -> %s", exception.getMessage());
}