samsung gear live音频编码

Question

我目前正在开发一款Android Wear应用程序，我希望能进行音频录制。我已经在Android开发者网站上学习了教程，它在我的Nexus 7上运行得很好，但在我测试的三星Gear Live上就不行了。应用程序总是崩溃。

深入研究一下这个问题，我可能会发现这是记录器工作所需的两个参数的问题:要么是OutputFormat，要么是AudioEncoder。我试着配对并尝试所有可用的OutputFormat和AudioEncoder，但一无所获。

所以我的问题是:是不是有人遇到了同样的问题？如果是这样，您是否找到了正确的Format/Encoder组合？

我不粘贴我的代码，因为它与文档中的代码完全相同。如果你想看一下，这里有个链接：http://developer.android.com/guide/topics/media/audio-capture.html

提前感谢您的回答和您的时间:)

Answer 1

根本问题是您不能使用MediaRecorder，即使是Android audio capture example does，但您需要使用AudioRecord类。

此外，我建议将原始数据传输回手机，以便将其组装成音频文件，因为这在可穿戴设备上是非常棘手的。

有关更多信息，请参阅this answer。

我已经包括了下面的一个样本，我得到了工作。

import android.app.Activity;
import android.content.Intent;
import android.media.AudioFormat;
import android.media.AudioRecord;
import android.media.MediaRecorder;
import android.os.Bundle;
import android.speech.RecognizerIntent;
import android.support.wearable.view.WatchViewStub;
import android.util.Log;
import android.widget.TextView;
import android.view.View;

import java.util.List;

public class MainActivity extends Activity {
    private static final String TAG = MainActivity.class.getName();
    private static final int SPEECH_REQUEST_CODE = 1;

    private static final int RECORDER_SAMPLERATE = 44100;
    private static final int RECORDER_CHANNELS = AudioFormat.CHANNEL_IN_STEREO;
    private static final int RECORDER_AUDIO_ENCODING = AudioFormat.ENCODING_PCM_16BIT;

    private TextView mTextView;
    private AudioRecord recorder;
    private int bufferSize = 0;
    private Thread recordingThread = null;
    private volatile boolean isRecording;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        Log.v(TAG, "Creating MainActivity");
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        final WatchViewStub stub = (WatchViewStub) findViewById(R.id.watch_view_stub);
        stub.setOnLayoutInflatedListener(new WatchViewStub.OnLayoutInflatedListener() {
            @Override
            public void onLayoutInflated(WatchViewStub stub) {
                mTextView = (TextView) stub.findViewById(R.id.text);
            }
        });

        bufferSize =
                AudioRecord.getMinBufferSize(RECORDER_SAMPLERATE,
                        RECORDER_CHANNELS, RECORDER_AUDIO_ENCODING);
    }

    public void handleRecordButtonClick(View view) {
        startAudioCapture();
    }

    public void handleStopButtonClick(View view) {
        stopAudioCapture();
    }

    private void startAudioCapture() {
        Log.v(TAG, "Starting audio capture");
        recorder = new AudioRecord(MediaRecorder.AudioSource.MIC,
                RECORDER_SAMPLERATE, RECORDER_CHANNELS, RECORDER_AUDIO_ENCODING,     bufferSize);
        if (recorder.getState() == AudioRecord.STATE_INITIALIZED) {
            recorder.startRecording();
            isRecording = true;
            Log.v(TAG, "Successfully started recording");

            recordingThread = new Thread(new Runnable() {

                @Override
                public void run() {
                    processRawAudioData();
                }
            }, "AudioRecorder Thread");

            recordingThread.start();
        } else {
            Log.v(TAG, "Failed to started recording");
        }
    }

    private void stopAudioCapture() {
        Log.v(TAG, "Stop audio capture");
        recorder.stop();
        isRecording = false;
        recorder.release();
    }

    private void processRawAudioData() {
        byte data[] = new byte[bufferSize];
        int read = 0;
        while(isRecording) {
            read = recorder.read(data, 0, bufferSize);

            if(AudioRecord.ERROR_INVALID_OPERATION != read) {
                Log.v(TAG, "Successfully read " + data.length + " bytes of audio");
            }
        }
    }
}