android.media.MediaRecorder#reset ( )源码实例Demo

private void startAndSaveRecord(File recordFile) {
    stopRecord();
    mMediaRecorder = new MediaRecorder();
    mMediaRecorder.reset();
    // TODO: 16.05.17 not working well
    mMediaRecorder.setAudioSource(mPreferenceHelper.getAudioSource());   //or default voice_communication
    mMediaRecorder.setOutputFormat(mPreferenceHelper.getOutputFormat()); //MP4
    mMediaRecorder.setAudioEncoder(mPreferenceHelper.getAudioEncoder()); //AAC
    mMediaRecorder.getMaxAmplitude();
    try {
        if (!recordFile.createNewFile()) {
            Log.i(TAG, "File name has been already given");
        }
        mMediaRecorder.setOutputFile(recordFile.getAbsolutePath());
        mMediaRecorder.prepare();
        mMediaRecorder.start();
    } catch (IOException e) {
        Log.e(TAG, "Error: Recording could not be starting!", e);
    }
}
 

@Override
public void initRecorder(Camera camera, int cameraId, Surface surface, String filePath)
{
    mMediaRecorder = new MediaRecorder();
    mMediaRecorder.reset();
    if (camera != null)
        mMediaRecorder.setCamera(camera);
    mMediaRecorder.setOnErrorListener(this);
    mMediaRecorder.setPreviewDisplay(surface);
    mMediaRecorder.setVideoSource(MediaRecorder.VideoSource.CAMERA);//视频源
    mMediaRecorder.setAudioSource(MediaRecorder.AudioSource.MIC);//音频源
    mMediaRecorder.setOutputFormat(MediaRecorder.OutputFormat.MPEG_4);//视频输出格式 也可设为3gp等其他格式
    mMediaRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);//音频格式
    mMediaRecorder.setVideoSize(640, 480);//设置分辨率，市面上大多数都支持640*480
    //        mediaRecorder.setVideoFrameRate(25);//设置每秒帧数 这个设置有可能会出问题，有的手机不支持这种帧率就会录制失败，这里使用默认的帧率，当然视频的大小肯定会受影响
    //这里设置可以调整清晰度
    mMediaRecorder.setVideoEncodingBitRate(2 * 1024 * 512);

    if (cameraId == Camera.CameraInfo.CAMERA_FACING_BACK)
        mMediaRecorder.setOrientationHint(90);
    else
        mMediaRecorder.setOrientationHint(270);
    mMediaRecorder.setVideoEncoder(MediaRecorder.VideoEncoder.H264);//视频录制格式
    mMediaRecorder.setOutputFile(filePath);
}
 

static Audio recordAudio(UQI uqi, long duration) throws IOException {
    List<Integer> amplitudes = new ArrayList<>();

    MediaRecorder recorder = new MediaRecorder();
    recorder.setAudioSource(Globals.AudioConfig.audioSource);
    recorder.setOutputFormat(Globals.AudioConfig.outputFormat);
    recorder.setAudioEncoder(Globals.AudioConfig.audioEncoder);

    String audioPath = "temp/audio_" + TimeUtils.getTimeTag() + ".amr";
    File tempAudioFile = StorageUtils.getValidFile(uqi.getContext(), audioPath, false);
    recorder.setOutputFile(tempAudioFile.getAbsolutePath());

    recorder.prepare();
    recorder.start();   // Recording is now started

    long startTime = System.currentTimeMillis();
    while (true) {
        long currentTime = System.currentTimeMillis();
        if (currentTime - startTime > duration) {
            break;
        }
        amplitudes.add(recorder.getMaxAmplitude());
    }

    recorder.stop();
    recorder.reset();   // You can reuse the object by going back to setAudioSource() step
    recorder.release(); // Now the object cannot be reused

    AudioData audioData = AudioData.newTempRecord(tempAudioFile, amplitudes);

    return new Audio(startTime, audioData);
}
 

@Override
public void onError(MediaRecorder mr, int what, int extra) {
    try {
        if (mr != null)
            mr.reset();
    } catch (Exception e) {
        e.printStackTrace();
    }
}
 

private void startRecord() {
    mediaRecorder = new MediaRecorder();
    mediaRecorder.reset();
    mCamera.unlock();
    // 设置录制视频源为Camera(相机)
    mediaRecorder.setCamera(mCamera);
    mediaRecorder.setVideoSource(MediaRecorder.VideoSource.CAMERA);
    mediaRecorder.setAudioSource(MediaRecorder.AudioSource.MIC);
    // 设置录制完成后视频的封装格式THREE_GPP为3gp.MPEG_4为mp4
    mediaRecorder.setOutputFormat(MediaRecorder.OutputFormat.MPEG_4);
    // 设置录制的视频编码h263 h264
    mediaRecorder.setVideoEncoder(MediaRecorder.VideoEncoder.H264);
    mediaRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);
    // 设置视频录制的分辨率。必须放在设置编码和格式的后面，否则报错
    mediaRecorder.setVideoSize(width, height);
    // 设置录制的视频帧率。必须放在设置编码和格式的后面，否则报错
    if (SELECTED_CAMERA == CAMERA_FRONT_POSITION) {
        mediaRecorder.setOrientationHint(270);
    } else {
        mediaRecorder.setOrientationHint(90);
    }
    mediaRecorder.setMaxDuration(10000);
    mediaRecorder.setVideoEncodingBitRate(5 * 1024 * 1024);
    mediaRecorder.setVideoFrameRate(20);
    mediaRecorder.setPreviewDisplay(mHolder.getSurface());
    // 设置视频文件输出的路径
    mediaRecorder.setOutputFile("/sdcard/love.mp4");
    try {
        //准备录制
        mediaRecorder.prepare();
        // 开始录制
        mediaRecorder.start();
    } catch (IOException e) {
        e.printStackTrace();
    }
}
 

/**
 * prepare for a new audio record.
 */
@WorkerThread
public synchronized boolean prepareRecord(int audioSource, int outputFormat, int audioEncoder,
        int sampleRate, int bitRate, File outputFile) {
    stopRecord();

    mRecorder = new MediaRecorder();
    mRecorder.setAudioSource(audioSource);
    mRecorder.setOutputFormat(outputFormat);
    mRecorder.setAudioSamplingRate(sampleRate);
    mRecorder.setAudioEncodingBitRate(bitRate);
    mRecorder.setAudioEncoder(audioEncoder);
    mRecorder.setOutputFile(outputFile.getAbsolutePath());

    // Handle IOException
    try {
        mRecorder.prepare();
    } catch (IOException exception) {
        Log.w(TAG, "startRecord fail, prepare fail: " + exception.getMessage());
        setError(ERROR_INTERNAL);
        mRecorder.reset();
        mRecorder.release();
        mRecorder = null;
        return false;
    }
    mState = STATE_PREPARED;
    return true;
}
 

@Override
public void onError(MediaRecorder mr, int what, int extra)
{
    try
    {
        if (mr != null)
            mr.reset();
    } catch (Exception e)
    {
        mIsRecording = false;
    }
}