使用表面视图android录制视频

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【中文标题】使用表面视图android录制视频【英文标题】:Record Video using surface view android 【发布时间】:2014-07-19 20:35:30 【问题描述】:

我必须创建一个 android 应用程序,我在其中尝试使用表面视图录制视频和捕获图像。 到目前为止,我能够捕获视频,但在录制视频时遇到问题。 我的视频录制代码是 -

onCreate()
      ..
     surfaceHolder = surfaceView.getHolder();
     surfaceHolder.addCallback(this);
     surfaceHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
     startRecording();
     .
     .



protected void startRecording() throws IOException
    
        if(mCamera==null)
            mCamera = Camera.open();

         String filename;
         String path;

         path= Environment.getExternalStorageDirectory().getAbsolutePath().toString();

         Date date=new Date();
         filename="/rec"+date.toString().replace(" ", "_").replace(":", "_")+".mp4";

         File file=new File(path,filename);

        mrec = new MediaRecorder(); 

        mCamera.lock();
        mCamera.unlock();


        mrec.setCamera(mCamera);    
        mrec.setVideoSource(MediaRecorder.VideoSource.CAMERA);
        mrec.setAudiosource(MediaRecorder.AudioSource.MIC);     
        mrec.setOutputFormat(MediaRecorder.OutputFormat.MPEG_4);
        mrec.setVideoEncoder(MediaRecorder.VideoEncoder.MPEG_4_SP);
        mrec.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);
        mrec.setPreviewDisplay(surfaceHolder.getSurface());
        mrec.setOutputFile(path+filename);
        mrec.setMaxDuration(10000); 
  
       @Override
    public void surfaceChanged(SurfaceHolder holder, int format, int width,int                height)       

        Camera.Parameters parameters = mCamera.getParameters();      
        parameters.setPreviewSize(width, height);     
        try 
            mCamera.setPreviewDisplay(surfaceHolder);
         catch (IOException e) 
            // TODO Auto-generated catch block
            e.printStackTrace();
        
        mCamera.setParameters(parameters);       
        mCamera.startPreview(); 

    

但是当在线调用 onSurfaceChange 方法代码时应用程序强制关闭 - mCamera.setPreviewDisplay(surfaceHolder);异常 java.lang.RuntimeException: setParameters failed

那么我该如何管理它,以便我可以开始视频录制。 提前致谢。

【问题讨论】:

它失败了,因为并非所有设备都支持任意预览尺寸。显然有些可以,但你不能依赖它。 那么我该如何处理这个问题。 在下面检查我的答案,它必须在 surfaceChanged 方法中完成。 查看此链接github.com/krazykira/CuXtomCam/blob/master/… 我发布的完整示例对您没有帮助? 【参考方案1】:

检查此代码,希望它有效..

import java.io.IOException;
import android.app.Activity;
import android.content.pm.ActivityInfo;
import android.hardware.Camera;
import android.media.MediaRecorder;
import android.os.Bundle;
import android.view.Surface;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.ToggleButton;

public class MediaRecorderRecipe extends Activity implements SurfaceHolder.Callback 
private final String VIDEO_PATH_NAME = "/mnt/sdcard/VGA_30fps_512vbrate.mp4";

private MediaRecorder mMediaRecorder;
private Camera mCamera;
private SurfaceView mSurfaceView;
private SurfaceHolder mHolder;
private View mToggleButton;
private boolean mInitSuccesful;

@Override
public void onCreate(Bundle savedInstanceState) 
    super.onCreate(savedInstanceState);
    setContentView(R.layout.media_recorder_recipe);

    // we shall take the video in landscape orientation
    setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);

    mSurfaceView = (SurfaceView) findViewById(R.id.surfaceView);
    mHolder = mSurfaceView.getHolder();
    mHolder.addCallback(this);
    mHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);

    mToggleButton = (ToggleButton) findViewById(R.id.toggleRecordingButton);
    mToggleButton.setOnClickListener(new OnClickListener() 
        @Override
        // toggle video recording
        public void onClick(View v) 
            if (((ToggleButton)v).isChecked()) 
                mMediaRecorder.start();
                try 
                    Thread.sleep(10 * 1000); // This will recode for 10 seconds, if you don't want then just remove it.
                 catch (Exception e) 
                    e.printStackTrace();
                
                finish();
            
            else 
                mMediaRecorder.stop();
                mMediaRecorder.reset();
                try 
                    initRecorder(mHolder.getSurface());
                 catch (IOException e) 
                    e.printStackTrace();
                
            
        
    );     


/* Init the MediaRecorder, the order the methods are called is vital to
 * its correct functioning */
private void initRecorder(Surface surface) throws IOException 
    // It is very important to unlock the camera before doing setCamera
    // or it will results in a black preview
    if(mCamera == null) 
        mCamera = Camera.open();
        mCamera.unlock();
    

    if(mMediaRecorder == null)  mMediaRecorder = new MediaRecorder();
    mMediaRecorder.setPreviewDisplay(surface);
    mMediaRecorder.setCamera(mCamera);

    mMediaRecorder.setVideoSource(MediaRecorder.VideoSource.DEFAULT);
   //       mMediaRecorder.setOutputFormat(8);
    mMediaRecorder.setOutputFormat(MediaRecorder.OutputFormat.MPEG_4);
    mMediaRecorder.setVideoEncoder(MediaRecorder.VideoEncoder.H264);
    mMediaRecorder.setVideoEncodingBitRate(512 * 1000);
    mMediaRecorder.setVideoFrameRate(30);
    mMediaRecorder.setVideoSize(640, 480);
    mMediaRecorder.setOutputFile(VIDEO_PATH_NAME);

    try 
        mMediaRecorder.prepare();
     catch (IllegalStateException e) 
        // This is thrown if the previous calls are not called with the 
        // proper order
        e.printStackTrace();
    

    mInitSuccesful = true;


@Override
public void surfaceCreated(SurfaceHolder holder) 
    try 
        if(!mInitSuccesful)
            initRecorder(mHolder.getSurface());
     catch (IOException e) 
        e.printStackTrace();
    


@Override
public void surfaceDestroyed(SurfaceHolder holder) 
    shutdown();


@Override
public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) 

private void shutdown() 
    // Release MediaRecorder and especially the Camera as it's a shared
    // object that can be used by other applications
    mMediaRecorder.reset();
    mMediaRecorder.release();
    mCamera.release();

    // once the objects have been released they can't be reused
    mMediaRecorder = null;
    mCamera = null;

权限

<uses-permission android:name="android.permission.CAMERA"/>
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.RECORD_AUDIO" />
<uses-feature android:name="android.hardware.camera.autofocus" />

XML 文件

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_
android:layout_>
<ToggleButton
 android:id="@+id/toggleRecordingButton"
 android:layout_
 android:textOff="Start Recording" 
 android:textOn="Stop Recording"
 android:layout_
/>
<FrameLayout
 android:layout_
 android:layout_>
 <SurfaceView android:id="@+id/surfaceView" 
    android:layout_ 
    android:layout_></SurfaceView>

</FrameLayout>
</LinearLayout>

创建文件以保存图像或视频

private static File getOutputMediaFile(int type)
    // To be safe, you should check that the SDCard is mounted
    // using Environment.getExternalStorageState() before doing this.

    File mediaStorageDir = new File(Environment.getExternalStoragePublicDirectory(
              Environment.DIRECTORY_PICTURES), "MyCameraApp");
    // This location works best if you want the created images to be shared
    // between applications and persist after your app has been uninstalled.

    // Create the storage directory if it does not exist
    if (! mediaStorageDir.exists())
        if (! mediaStorageDir.mkdirs())
            Log.d("MyCameraApp", "failed to create directory");
            return null;
        
    

    // Create a media file name
    String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss").format(new Date());
    File mediaFile;
    if (type == MEDIA_TYPE_IMAGE)
        mediaFile = new File(mediaStorageDir.getPath() + File.separator +
        "IMG_"+ timeStamp + ".jpg");
     else if(type == MEDIA_TYPE_VIDEO) 
        mediaFile = new File(mediaStorageDir.getPath() + File.separator +
        "VID_"+ timeStamp + ".mp4");
     else 
        return null;
    

    return mediaFile;

【讨论】:

如果我想增加录制时间? 我可以使用您的代码录制视频..现在可以在录制过程中同时捕获图像吗? hii .. @Aniruddha 我可以录制视频,但我的应用会在 10 秒后录制完成后自动销毁。你能告诉我这背后的原因吗?提前谢谢你 @RuchaBhatt:在mToggleButton.setOnClickListener方法里面,catch块后面有finish(),请注释finish(),然后你的应用程序不会关闭。 我只是复制并粘贴您的代码,但它给了我一个错误Attempt to invoke virtual method 'android.view.SurfaceHolder android.view.SurfaceView.getHolder()' on a null object reference【参考方案2】:

您可以通过在 Camera.getParameters 返回的 Camera.Parameters 对象中调用 getSupportedPreviewSizes 来获取可用预览尺寸的列表。 Check here

surfaceChanged方法中添加以下代码

Camera.Parameters parameters = camera.getParameters();  
   List<Camera.Size> sizes = parameters.getSupportedPreviewSizes();  
   Camera.Size cs = sizes.get(0);  // You need to choose the most appropriate previewSize for your app. So select one from the list
   parameters.setPreviewSize(cs.width, cs.height);  
   camera.setParameters(parameters);
   camera.startPreview();

编辑如下更改您的 surfaceChanged 方法并检查

public void surfaceChanged(SurfaceHolder holder, int format, int w, int h) 
        // If your preview can change or rotate, take care of those events here.
        // Make sure to stop the preview before resizing or reformatting it.
        Log.d("Function", "surfaceChanged");
        if (mHolder.getSurface() == null)
          // preview surface does not exist
          return;
        

        // stop preview before making changes
        try 
            mCamera.stopPreview();
         catch (Exception e)
          // ignore: tried to stop a non-existent preview
        

        // set preview size and make any resize, rotate or
        // reformatting changes here


        // start preview with new settings
        try 
            mCamera.setPreviewDisplay(mHolder);
            mCamera.startPreview();

         catch (Exception e)
            Log.d(TAG, "Error starting camera preview: " + e.getMessage());
        
    

【讨论】:

parameters.getSupportedPreviewSizes();在我的三星 s7562 上返回 null getPreviewSize替换getSupportedPreviewSizes并检查。 List sizes = (List) parameters.getPreviewSize();也返回 null 可以换个手机查吗? 医生说This method will always return a list with at least one element.请换手机检查一次。

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