Android视频采集

TAG:

2010-10-13晚上更新～将之前做过的一个比较实用的在Android实时采集视频，并在PC上显示出采集到的视频的程序，包括PC端和Android端程序，基于Android 1.5 在HTC G3上测试通过。代码在分界线之后。

之前网上找了很多资料，没有找到如何截取Android视频流。后来发现在Android的拍照视频预览时就可以截取视频数据。每获得一帧就调用一下接口函数。

我的开发平台是Android 1.5，这个程序实现视频流的获取，程序简单地在第20帧到来的时候，写入到文件中。这样就可以拿到电脑上进行分析。

具体请大家参考代码

package com.sunshine;

import java.io.File;
import java.io.RandomAccessFile;

import android.app.Activity;
import android.content.res.Configuration;
import android.graphics.PixelFormat;
import android.hardware.Camera;
import android.os.Bundle;
import android.util.Log;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.view.Window;
import android.view.WindowManager;
import android.view.SurfaceHolder.Callback;

public class AndroidVideo extends Activity implements Callback,
Camera.PictureCallback {
private SurfaceView mSurfaceView = null;
private SurfaceHolder mSurfaceHolder = null;
private Camera mCamera = null;
private boolean mPreviewRunning = false;

@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);

getWindow().setFormat(PixelFormat.TRANSLUCENT);
requestWindowFeature(Window.FEATURE_NO_TITLE);
getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
WindowManager.LayoutParams.FLAG_FULLSCREEN);

setContentView(R.layout.main);

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

}

@Override
public void onPictureTaken(byte[] data, Camera camera) {
try {
Log.v("System.out", "get it!");
File file = new File("/sdcard/camera.jpg");
RandomAccessFile raf = new RandomAccessFile(file, "rw");
raf.write(data);
raf.close();
} catch (Exception ex) {
Log.v("System.out", ex.toString());
}
}

@Override
public void surfaceChanged(SurfaceHolder holder, int format, int width,
int height) {
if (mPreviewRunning) {
mCamera.stopPreview();
}
Camera.Parameters p = mCamera.getParameters();
p.setPreviewSize(width, height);
mCamera.setPreviewCallback(new StreamIt());
mCamera.setParameters(p);
try {
mCamera.setPreviewDisplay(holder);
} catch (Exception ex) {
}
mCamera.startPreview();
mPreviewRunning = true;
}

@Override
public void surfaceCreated(SurfaceHolder holder) {
mCamera = Camera.open();
}

@Override
public void surfaceDestroyed(SurfaceHolder holder) {
mCamera.stopPreview();
mPreviewRunning = false;
mCamera.release();
}

@Override
public void onConfigurationChanged(Configuration newConfig) {
try {
super.onConfigurationChanged(newConfig);
if (this.getResources().getConfiguration().orientation == Configuration.ORIENTATION_LANDSCAPE) {
} else if (this.getResources().getConfiguration().orientation == Configuration.ORIENTATION_PORTRAIT) {
}
} catch (Exception ex) {
}
}
}

class StreamIt implements Camera.PreviewCallback {
private int tick = 1;

@Override
public void onPreviewFrame(byte[] data, Camera camera) {
// TODO Auto-generated method stub
if (tick == 20) {
System.out.println("data len: " + data.length);
try {
File file = new File("/sdcard/pal.pal");
if (!file.exists())
file.createNewFile();
RandomAccessFile raf = new RandomAccessFile(file, "rw");
raf.write(data);
raf.close();
tick++;
} catch (Exception ex) {
Log.v("System.out", ex.toString());
}
}
tick++;
}
}

xml 布局文件

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent" android:layout_height="fill_parent"
android:orientation="vertical">
<SurfaceView android:id="@+id/surface_camera"
android:layout_width="fill_parent" android:layout_height="fill_parent">
</SurfaceView>
</LinearLayout>

注意在项目配置文件中还要加上访问权限

<uses-permission android:name="android.permission.CAMERA" />

通过查资料发现，Android每帧的数据流的格式是YUV420

下面附上一个将 YUV420转成RGB的函数，

staticpublicvoiddecodeYUV420SP(byte[] rgbBuf,byte[] yuv420sp,intwidth,intheight) {
finalintframeSize = width * height;
if(rgbBuf ==null)
thrownewNullPointerException("buffer 'rgbBuf' is null");
if(rgbBuf.length < frameSize *3)
thrownewIllegalArgumentException("buffer 'rgbBuf' size "
+ rgbBuf.length +" < minimum "+ frameSize *3);
if(yuv420sp ==null)
thrownewNullPointerException("buffer 'yuv420sp' is null");
if(yuv420sp.length < frameSize *3/2)
thrownewIllegalArgumentException("buffer 'yuv420sp' size "+ yuv420sp.length
+" < minimum "+ frameSize *3/2);
inti =0, y =0;
intuvp =0, u =0, v =0;
inty1192 =0, r =0, g =0, b =0;
for(intj =0, yp =0; j < height; j++) {
uvp = frameSize + (j >>1) * width;
u =0;
v =0;
for(i =0; i < width; i++, yp++) {
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;
}
y1192 =1192* y;
r = (y1192 +1634* v);
g = (y1192 -833* v -400* u);
b = (y1192 +2066* u);
if(r <0) r =0;elseif(r >262143) r =262143;
if(g <0) g =0;elseif(g >262143) g =262143;
if(b <0) b =0;elseif(b >262143) b =262143;
rgbBuf[yp *3] = (byte)(r >>10);
rgbBuf[yp *3+1] = (byte)(g >>10);
rgbBuf[yp *3+2] = (byte)(b >>10);
}
}
}

代码来自http://chenweihuacwh.javaeye.com/blog/571223

感谢cwh643

-----------------------------分界线-------------------------------------------

-----------------------------2010-10-13更新-------------------------------

Android 端

package com.sunshine;

import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.net.Socket;

import android.app.Activity;
import android.content.res.Configuration;
import android.graphics.PixelFormat;
import android.hardware.Camera;
import android.os.Bundle;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.view.View;
import android.view.Window;
import android.view.WindowManager;
import android.view.SurfaceHolder.Callback;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;

public class AndroidVideo extends Activity implements Callback,OnClickListener{
private SurfaceView mSurfaceView = null;
private SurfaceHolder mSurfaceHolder = null;
private Camera mCamera = null;
private boolean mPreviewRunning = false;

//连接相关
private EditText remoteIP=null;
private Button connect=null;
private String remoteIPStr=null;

//视频数据
private StreamIt streamIt=null;
public static Kit kit=null;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);

getWindow().setFormat(PixelFormat.TRANSLUCENT);
requestWindowFeature(Window.FEATURE_NO_TITLE);
getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
WindowManager.LayoutParams.FLAG_FULLSCREEN);

setContentView(R.layout.main);

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

remoteIP=(EditText)this.findViewById(R.id.remoteIP);
connect=(Button)this.findViewById(R.id.connect);
connect.setOnClickListener(this);

}

public void surfaceChanged(SurfaceHolder holder, int format, int width,
int height) {
if (mPreviewRunning) {
mCamera.stopPreview();
}
Camera.Parameters p = mCamera.getParameters();
p.setPreviewSize(width, height);
streamIt=new StreamIt();
kit=new Kit();
mCamera.setPreviewCallback(streamIt);

mCamera.setParameters(p);
try {
mCamera.setPreviewDisplay(holder);
} catch (Exception ex) {
}
mCamera.startPreview();
mPreviewRunning = true;
}

public void surfaceCreated(SurfaceHolder holder) {
mCamera = Camera.open();
}

public void surfaceDestroyed(SurfaceHolder holder) {
mCamera.stopPreview();
mPreviewRunning = false;
mCamera.release();
}

@Override
public void onConfigurationChanged(Configuration newConfig) {
try {
super.onConfigurationChanged(newConfig);
if (this.getResources().getConfiguration().orientation == Configuration.ORIENTATION_LANDSCAPE) {
} else if (this.getResources().getConfiguration().orientation == Configuration.ORIENTATION_PORTRAIT) {
}
} catch (Exception ex) {
}
}

class Kit implements Runnable {
private boolean run=true;
//        private final int dataLen=57600; //307200 OR 230400 76800 OR 57600
private final int tt=28800;

public void run() {
// TODO Auto-generated method stub
try {
Socket socket = new Socket(remoteIPStr, 8899);
DataOutputStream dos = new DataOutputStream(socket
.getOutputStream());
DataInputStream dis = new DataInputStream(socket
.getInputStream());
while (run) {
dos.write(streamIt.yuv420sp, 0, 28800);
dos.write(streamIt.yuv420sp, 28800, 28800);

dis.readBoolean();
Thread.sleep(155);
}
} catch (Exception ex) {
run=false;
ex.printStackTrace();
}
}

}

@Override
public void onClick(View view) {
// TODO Auto-generated method stub
if(view==connect){//连接函数
remoteIPStr=remoteIP.getText().toString();
new Thread(AndroidVideo.kit).start();
}
}
}

class StreamIt implements Camera.PreviewCallback {
public byte[] yuv420sp =null;
private boolean t=true;

public void onPreviewFrame(byte[] data, Camera camera) {
// TODO Auto-generated method stub
//        if(t){
//            t=false;
//            new Thread(AndroidVideo.kit).start();
//        }
yuv420sp=data;
}
}

PC端

import java.awt.Frame;
import java.awt.Graphics;
import java.awt.Point;
import java.awt.Transparency;
import java.awt.color.ColorSpace;
import java.awt.image.BufferedImage;
import java.awt.image.ComponentColorModel;
import java.awt.image.DataBuffer;
import java.awt.image.DataBufferByte;
import java.awt.image.PixelInterleavedSampleModel;
import java.awt.image.Raster;
import java.awt.image.SampleModel;
import java.awt.image.WritableRaster;
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.net.ServerSocket;
import java.net.Socket;

public class FlushMe extends Frame {
private static final long serialVersionUID = 1L;
private BufferedImage im;
// 图像信息
// private final int width = 480;
// private final int height = 320;
private static final int width = 240;
private static final int height = 160;
private static final int numBands = 3;
private static final int dataLen = 57600;//307200 OR 230400//57600 76800
private static final int tt = 28800;//14400;//28800;
// 图像数组
private byte[] byteArray = new byte[width * height * numBands];// 图像RGB数组
private byte[] yuv420sp = new byte[dataLen];// 图像YUV数组

private static final int[] bandOffsets = new int[] { 0, 1, 2 };
private static final SampleModel sampleModel = new PixelInterleavedSampleModel(
DataBuffer.TYPE_BYTE, width, height, 3, width * 3,
bandOffsets);
// ColorModel
private static final ColorSpace cs=ColorSpace.getInstance(ColorSpace.CS_sRGB);
private static final ComponentColorModel cm=new ComponentColorModel(cs, false, false,
Transparency.OPAQUE, DataBuffer.TYPE_BYTE);

public FlushMe() {
super("Flushing");
updateIM();
setSize(480, 320);
// 窗口关闭方法
this.addWindowListener(new java.awt.event.WindowAdapter() {
public void windowClosing(java.awt.event.WindowEvent e) {
System.exit(0);
}
});
// 窗口居中
this.setLocationRelativeTo(null);
this.setResizable(false);
this.setVisible(true);
this.getData();
}

public void update(Graphics g){
paint(g);
}

public void paint(Graphics g) {
g.drawImage(im, 0, 0, 480, 320, this);
}

public void getData() {
try {
ServerSocket server = new ServerSocket(8899);
Socket socket = server.accept();
DataInputStream dis = new DataInputStream(socket.getInputStream());
DataOutputStream dos = new DataOutputStream(socket.getOutputStream());
while (true) {
for (int i = 0; i < dataLen / tt; i++) {
dis.read(yuv420sp, i * tt, tt);
}
// 得到数据之后立即更新显示
updateIM();
im.flush();
repaint();

dos.writeBoolean(true);
}
} catch (Exception ex) {
ex.printStackTrace();
}
}

private void updateIM() {
try {
// 解析YUV成RGB格式
decodeYUV420SP(byteArray, yuv420sp, width, height);
DataBuffer dataBuffer = new DataBufferByte(byteArray, numBands);
WritableRaster wr = Raster.createWritableRaster(sampleModel,
dataBuffer, new Point(0, 0));
im = new BufferedImage(cm, wr, false, null);
} catch (Exception ex) {
ex.printStackTrace();
}
}

private static void decodeYUV420SP(byte[] rgbBuf, byte[] yuv420sp,
int width, int height) {
final int frameSize = width * height;
if (rgbBuf == null)
throw new NullPointerException("buffer 'rgbBuf' is null");
if (rgbBuf.length < frameSize * 3)
throw new IllegalArgumentException("buffer 'rgbBuf' size "
+ rgbBuf.length + " < minimum " + frameSize * 3);

if (yuv420sp == null)
throw new NullPointerException("buffer 'yuv420sp' is null");

if (yuv420sp.length < frameSize * 3 / 2)
throw new IllegalArgumentException("buffer 'yuv420sp' size "
+ yuv420sp.length + " < minimum " + frameSize * 3 / 2);

int i = 0, y = 0;
int uvp = 0, u = 0, v = 0;
int y1192 = 0, r = 0, g = 0, b = 0;

for (int j = 0, yp = 0; j < height; j++) {
uvp = frameSize + (j >> 1) * width;
u = 0;
v = 0;
for (i = 0; i < width; i++, yp++) {
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;
}

y1192 = 1192 * y;
r = (y1192 + 1634 * v);
g = (y1192 - 833 * v - 400 * u);
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;

rgbBuf[yp * 3] = (byte) (r >> 10);
rgbBuf[yp * 3 + 1] = (byte) (g >> 10);
rgbBuf[yp * 3 + 2] = (byte) (b >> 10);
}
}
}

public static void main(String[] args) {
Frame f = new FlushMe();
}
}

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