android 采集摄像头帧图像数据并显示

来源：互联网发布：手机淘宝在哪里看等级编辑：程序博客网时间：2024/05/16 12:56
package com.example.ict.video_frame;import android.app.Activity;import android.graphics.Bitmap;import android.graphics.Matrix;import android.graphics.PixelFormat;import android.hardware.Camera;import android.media.Image;import android.os.Bundle;import android.util.Log;import android.view.SurfaceHolder;import android.view.SurfaceView;import android.view.View;import android.widget.Button;import android.widget.ImageView;import java.io.FileOutputStream;import java.io.IOException;import java.nio.ByteBuffer;public class MainActivity extends Activity{    private Camera mCamera = null;    private SurfaceHolder holder = null;    int filename = 0;    private Button button1,button2;    private ImageView imageView = null;    private int width = 640;    private int height = 480;    private Bitmap VideoBit = null;    private ByteBuffer byteBuffer = null;    private byte rgb_data[] = new byte[width*height*4];    class Callback implements Camera.PreviewCallback    {        @Override        public void onPreviewFrame(byte[] frame, Camera camera)        {             //   writeFileSDcardFile_byte("/mnt/sdcard/DCIM/"+String.valueOf(filename)+".txt",frame);                decodeYUV420SP(rgb_data,frame,width,height);                VideoBit = Bitmap.createBitmap(width,height,Bitmap.Config.ARGB_8888);                byteBuffer = ByteBuffer.wrap(rgb_data);                byteBuffer.position(0);                VideoBit.copyPixelsFromBuffer(byteBuffer);                Matrix matrix = new Matrix();                matrix.postRotate(90);                imageView.setImageBitmap(Bitmap.createBitmap(VideoBit, 0, 0, width, height, matrix, true));            filename++;        }    }    /** Called when the activity is first created. */    @Override    public void onCreate(Bundle savedInstanceState)    {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        SurfaceView mSurfaceView = (SurfaceView) this.findViewById(R.id.camera_preview);        button1 = (Button) findViewById(R.id.b1);        button2 = (Button) findViewById(R.id.b2);        imageView = (ImageView)findViewById(R.id.imageView);        holder = mSurfaceView.getHolder();        button1.setOnClickListener(new Button.OnClickListener(){            @Override            public void onClick(View v) {                if(mCamera == null)                {                    mCamera = Camera.open();                    Camera.Parameters p = mCamera.getParameters();                    p.setPreviewFormat(PixelFormat.YCbCr_420_SP);                    p.setPreviewSize(width,height);                    p.setPreviewFrameRate(15);    //设置帧率                    mCamera.setParameters(p);                    mCamera.setDisplayOrientation(90);                    try                    {                        mCamera.setPreviewDisplay(holder);                    }                    catch (IOException e)                    {                        e.printStackTrace();                    }                    mCamera.startPreview();                    Callback a = new Callback();                    mCamera.setPreviewCallback(a);                }            }        });        button2.setOnClickListener(new Button.OnClickListener(){            @Override            public void onClick(View v) {                finish();            }        });        holder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);    }    @Override    public void finalize()    {        try        {            super.finalize();        }        catch (Throwable e)        {            e.printStackTrace();        }    }    public void writeFileSDcardFile(String fileName,String write_str) throws IOException{        try{            FileOutputStream fout = new FileOutputStream(fileName);            byte []bytes = write_str.getBytes();            fout.write(bytes);            fout.close();        }catch (Exception e)        {            e.printStackTrace();        }    }    public void writeFileSDcardFile_byte(String fileName,byte bytes[]) throws IOException{        try{            FileOutputStream fout = new FileOutputStream(fileName);            fout.write(bytes);            fout.close();        }catch (Exception e)        {            e.printStackTrace();        }    }    static public void decodeYUV420SP(byte[] rgb, byte[] yuv420sp, int width, int height) {        final int frameSize = width * height;        for (int j = 0, yp = 0; j < height; j++) {            int uvp = frameSize + (j >> 1) * width, u = 0, v = 0;            for (int i = 0; i < width; i++, yp++) {                int y = (0xff & ((int) yuv420sp[yp])) - 16;                if (y < 0) y = 0;                if ((i & 1) == 0) {                    v = (0xff & yuv420sp[uvp++]) - 128;                    u = (0xff & yuv420sp[uvp++]) - 128;                }                int y1192 = 1192 * y;                int r = (y1192 + 1634 * v);                int g = (y1192 - 833 * v - 400 * u);                int b = (y1192 + 2066 * u);                if (r < 0) r = 0; else if (r > 262143) r = 262143;                if (g < 0) g = 0; else if (g > 262143) g = 262143;                if (b < 0) b = 0; else if (b > 262143) b = 262143;                rgb[yp*4] = (byte)(r >>10);                rgb[yp*4+1] = (byte)(g >>10);                rgb[yp*4+2] = (byte)(b >> 10);                rgb[yp*4+3] = (byte)255;            }        }    }}
0 0