Android 實時視頻采集—Cameara預覽采集

// 定義對象
 private SurfaceView mSurfaceview = null;  // SurfaceView對象：(視圖組件)視頻顯示 
 private SurfaceHolder mSurfaceHolder = null;  // SurfaceHolder對象：(抽象接口)SurfaceView支持類 
 private Camera mCamera =null;     // Camera對象，相機預覽

 // InitSurfaceView
 private void initSurfaceView()
 {
  mSurfaceview = (SurfaceView) this.findViewById(R.id.Surfaceview);
  mSurfaceHolder = mSurfaceview.getHolder(); // 綁定SurfaceView，取得SurfaceHolder對象
  mSurfaceHolder.addCallback(mainActivity.this); // SurfaceHolder加入回調接口
// mSurfaceHolder.setFixedSize(176, 144); // 預覽大小設置
  mSurfaceHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);// 設置顯示器類型，setType必須設置
 }

/*【SurfaceHolder.Callback 回調函數】*/
public void surfaceCreated(SurfaceHolder holder)
// SurfaceView啟動時/初次實例化，預覽界麵被創建時，該方法被調用。
 {
// TODO Auto-generated method stub  
  mCamera = Camera.open();// 開啟攝像頭（2.3版本後支持多攝像頭,需傳入參數） 
  try
  {   
   Log.i(TAG, "SurfaceHolder.Callback：surface Created");
   mCamera.setPreviewDisplay(mSurfaceHolder);//set the surface to be used for live preview

  } catch (Exception ex)
  {
if(null != mCamera)
   {
    mCamera.release();
    mCamera = null;     
   }
   Log.i(TAG+"initCamera", ex.getMessage());
  }
 }
public void surfaceChanged(SurfaceHolder holder, int format, int width, int height)
// 當SurfaceView/預覽界麵的格式和大小發生改變時，該方法被調用
 {
// TODO Auto-generated method stub  
  Log.i(TAG, "SurfaceHolder.Callback：Surface Changed");
//mPreviewHeight = height;
//mPreviewWidth = width;
  initCamera();  
 }
public void surfaceDestroyed(SurfaceHolder holder) 
// SurfaceView銷毀時，該方法被調用
 {
// TODO Auto-generated method stub
  Log.i(TAG, "SurfaceHolder.Callback：Surface Destroyed");
if(null != mCamera)
  {
   mCamera.setPreviewCallback(null); //！！這個必須在前，不然退出出錯
   mCamera.stopPreview(); 
   bIfPreview = false; 
   mCamera.release();
   mCamera = null;     
  }
 }

 1 /*【2】【相機預覽】*/
 2  private void initCamera()//surfaceChanged中調用
 3  {
 4   Log.i(TAG, "going into initCamera");
 5   if (bIfPreview)
 6   {
 7    mCamera.stopPreview();//stopCamera();
 8   }
 9   if(null != mCamera)
10   {
11    try
12    {
13     /* Camera Service settings*/    
14     Camera.Parameters parameters = mCamera.getParameters();
15     // parameters.setFlashMode("off"); // 無閃光燈
16     parameters.setPictureFormat(PixelFormat.JPEG); //Sets the image format for picture 設定相片格式為JPEG，默認為NV21    
17     parameters.setPreviewFormat(PixelFormat.YCbCr_420_SP); //Sets the image format for preview picture，默認為NV21
18     /*【ImageFormat】JPEG/NV16(YCrCb format，used for Video)/NV21(YCrCb format，used for Image)/RGB_565/YUY2/YU12*/
19     
20     // 【調試】獲取caera支持的PictrueSize，看看能否設置？？
21     List<Size> pictureSizes = mCamera.getParameters().getSupportedPictureSizes();
22     List<Size> previewSizes = mCamera.getParameters().getSupportedPreviewSizes();
23     List<Integer> previewFormats = mCamera.getParameters().getSupportedPreviewFormats();
24     List<Integer> previewFrameRates = mCamera.getParameters().getSupportedPreviewFrameRates();
25     Log.i(TAG+"initCamera", "cyy support parameters is ");
26     Size psize = null;
27     for (int i = 0; i < pictureSizes.size(); i++)
28     {
29      psize = pictureSizes.get(i);
30      Log.i(TAG+"initCamera", "PictrueSize,width: " + psize.width + " height" + psize.height);
31     }
32     for (int i = 0; i < previewSizes.size(); i++)
33     {
34      psize = previewSizes.get(i);
35      Log.i(TAG+"initCamera", "PreviewSize,width: " + psize.width + " height" + psize.height);
36     }
37     Integer pf = null;
38     for (int i = 0; i < previewFormats.size(); i++)
39     {
40      pf = previewFormats.get(i);
41      Log.i(TAG+"initCamera", "previewformates:" + pf);
42     }
43     
44     // 設置拍照和預覽圖片大小
45     parameters.setPictureSize(640, 480); //指定拍照圖片的大小
46     parameters.setPreviewSize(mPreviewWidth, mPreviewHeight); // 指定preview的大小 
47 //這兩個屬性 如果這兩個屬性設置的和真實手機的不一樣時，就會報錯
48     
49 // 橫豎屏鏡頭自動調整
50     if (this.getResources().getConfiguration().orientation != Configuration.ORIENTATION_LANDSCAPE) 
51     {
52      parameters.set("orientation", "portrait"); //
53      parameters.set("rotation", 90); // 鏡頭角度轉90度（默認攝像頭是橫拍） 
54      mCamera.setDisplayOrientation(90); // 在2.2以上可以使用
55     } else// 如果是橫屏
56     {
57      parameters.set("orientation", "landscape"); //
58      mCamera.setDisplayOrientation(0); // 在2.2以上可以使用
59     } 
60     
61     /* 視頻流編碼處理 */ 
62     //添加對視頻流處理函數
63     
64     
65 // 設定配置參數並開啟預覽
66     mCamera.setParameters(parameters); // 將Camera.Parameters設定予Camera    
67     mCamera.startPreview(); // 打開預覽畫麵
68     bIfPreview = true;
69     
70     // 【調試】設置後的圖片大小和預覽大小以及幀率
71     Camera.Size csize = mCamera.getParameters().getPreviewSize();
72     mPreviewHeight = csize.height; //
73     mPreviewWidth = csize.width;
74     Log.i(TAG+"initCamera", "after setting, previewSize:width: " + csize.width + " height: " + csize.height);
75     csize = mCamera.getParameters().getPictureSize();
76     Log.i(TAG+"initCamera", "after setting, pictruesize:width: " + csize.width + " height: " + csize.height);
77     Log.i(TAG+"initCamera", "after setting, previewformate is " + mCamera.getParameters().getPreviewFormat());
78     Log.i(TAG+"initCamera", "after setting, previewframetate is " + mCamera.getParameters().getPreviewFrameRate());
79    } catch (Exception e)
80    { 
81     e.printStackTrace();
82    }
83   }
84  }

 1  // 【獲取視頻預覽幀的接口】
 2   mJpegPreviewCallback = new Camera.PreviewCallback()
 3   {
 4    @Override
 5    public void onPreviewFrame(byte[] data, Camera camera) 
 6    {
 7     //傳遞進來的data,默認是YUV420SP的
 8 // TODO Auto-generated method stub    
 9     try
10     {
11      Log.i(TAG, "going into onPreviewFrame");
12      //mYUV420sp = data;   // 獲取原生的YUV420SP數據
13      YUVIMGLEN = data.length;
14      
15      // 拷貝原生yuv420sp數據
16      mYuvBufferlock.acquire();
17      System.arraycopy(data, 0, mYUV420SPSendBuffer, 0, data.length);
18      //System.arraycopy(data, 0, mWrtieBuffer, 0, data.length);
19      mYuvBufferlock.release();
20      
21      // 開啟編碼線程，如開啟PEG編碼方式線程
22      mSendThread1.start();
23      
24     } catch (Exception e)
25     {
26      Log.v("System.out", e.toString());
27     }// endtry    
28    }// endonPriview  
29   };