Android ICS和MJPEG使用AsyncTask

Question

I modified the MJPEG viewer code from Android and MJPEG to work using an AsyncTask (and thus work on Ice Cream Sandwich (ICS), 4.0.4) and here is my code.

If anyone has any suggestions on how to optimize, cleanup, or do something more proper with the code please let me know. Two issues I'd appreciate help addressing:

• If you have the device on a stream then lock the screen and unlock the screen it does not resume playing until you either kill and resume the app or rotate the screen. All my attempts at using OnResume() to do something or other resulted in app crashes.

• In particular I'd like to get the AsyncTask back in MjpegInputStream.java but was not able to get that to work.

MjpegActivity.java:

package com.demo.mjpeg;

import java.io.IOException;
import java.net.URI;

import org.apache.http.HttpResponse;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.DefaultHttpClient;

import com.demo.mjpeg.MjpegView.MjpegInputStream;
import com.demo.mjpeg.MjpegView.MjpegView;
import android.app.Activity;
import android.os.AsyncTask;
import android.os.Bundle;
import android.util.Log;
import android.view.Window;
import android.view.WindowManager;
import android.widget.Toast;

public class MjpegActivity extends Activity {
    private static final String TAG = "MjpegActivity";

    private MjpegView mv;

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

        //sample public cam
        String URL = "http://trackfield.webcam.oregonstate.edu/axis-cgi/mjpg/video.cgi?resolution=800x600&amp%3bdummy=1333689998337";

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

        mv = new MjpegView(this);
        setContentView(mv);        

        new DoRead().execute(URL);
    }

    public void onPause() {
        super.onPause();
        mv.stopPlayback();
    }

    public class DoRead extends AsyncTask<String, Void, MjpegInputStream> {
        protected MjpegInputStream doInBackground(String... url) {
            //TODO: if camera has authentication deal with it and don't just not work
            HttpResponse res = null;
            DefaultHttpClient httpclient = new DefaultHttpClient();     
            Log.d(TAG, "1. Sending http request");
            try {
                res = httpclient.execute(new HttpGet(URI.create(url[0])));
                Log.d(TAG, "2. Request finished, status = " + res.getStatusLine().getStatusCode());
                if(res.getStatusLine().getStatusCode()==401){
                    //You must turn off camera User Access Control before this will work
                    return null;
                }
                return new MjpegInputStream(res.getEntity().getContent());  
            } catch (ClientProtocolException e) {
                e.printStackTrace();
                Log.d(TAG, "Request failed-ClientProtocolException", e);
                //Error connecting to camera
            } catch (IOException e) {
                e.printStackTrace();
                Log.d(TAG, "Request failed-IOException", e);
                //Error connecting to camera
            }

            return null;
        }

        protected void onPostExecute(MjpegInputStream result) {
            mv.setSource(result);
            mv.setDisplayMode(MjpegView.SIZE_BEST_FIT);
            mv.showFps(true);
        }
    }
}

MjpegInputStream.java:

package com.demo.mjpeg.MjpegView;

import java.io.BufferedInputStream;
import java.io.ByteArrayInputStream;
import java.io.DataInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.Properties;

import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.util.Log;

public class MjpegInputStream extends DataInputStream {
    private static final String TAG = "MjpegInputStream";

    private final byte[] SOI_MARKER = { (byte) 0xFF, (byte) 0xD8 };
    private final byte[] EOF_MARKER = { (byte) 0xFF, (byte) 0xD9 };
    private final String CONTENT_LENGTH = "Content-Length";
    private final static int HEADER_MAX_LENGTH = 100;
    private final static int FRAME_MAX_LENGTH = 40000 + HEADER_MAX_LENGTH;
    private int mContentLength = -1;

    public MjpegInputStream(InputStream in) {
        super(new BufferedInputStream(in, FRAME_MAX_LENGTH));
    }

    private int getEndOfSeqeunce(DataInputStream in, byte[] sequence) throws IOException {
        int seqIndex = 0;
        byte c;
        for(int i=0; i < FRAME_MAX_LENGTH; i++) {
            c = (byte) in.readUnsignedByte();
            if(c == sequence[seqIndex]) {
                seqIndex++;
                if(seqIndex == sequence.length) {
                    return i + 1;
                }
            } else {
                seqIndex = 0;
            }
        }
        return -1;
    }

    private int getStartOfSequence(DataInputStream in, byte[] sequence) throws IOException {
        int end = getEndOfSeqeunce(in, sequence);
        return (end < 0) ? (-1) : (end - sequence.length);
    }

    private int parseContentLength(byte[] headerBytes) throws IOException, NumberFormatException {
        ByteArrayInputStream headerIn = new ByteArrayInputStream(headerBytes);
        Properties props = new Properties();
        props.load(headerIn);
        return Integer.parseInt(props.getProperty(CONTENT_LENGTH));
    }   

    public Bitmap readMjpegFrame() throws IOException {
        mark(FRAME_MAX_LENGTH);
        int headerLen = getStartOfSequence(this, SOI_MARKER);
        reset();
        byte[] header = new byte[headerLen];
        readFully(header);
        try {
            mContentLength = parseContentLength(header);
        } catch (NumberFormatException nfe) { 
            nfe.getStackTrace();
            Log.d(TAG, "catch NumberFormatException hit", nfe);
            mContentLength = getEndOfSeqeunce(this, EOF_MARKER); 
        }
        reset();
        byte[] frameData = new byte[mContentLength];
        skipBytes(headerLen);
        readFully(frameData);
        return BitmapFactory.decodeStream(new ByteArrayInputStream(frameData));
    }
}

MjpegView.java:

package com.demo.mjpeg.MjpegView;

import java.io.IOException;

import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.PorterDuff;
import android.graphics.PorterDuffXfermode;
import android.graphics.Rect;
import android.graphics.Typeface;
import android.util.AttributeSet;
import android.util.Log;
import android.view.SurfaceHolder;
import android.view.SurfaceView;

public class MjpegView extends SurfaceView implements SurfaceHolder.Callback {
    private static final String TAG = "MjpegView";

    public final static int POSITION_UPPER_LEFT  = 9;
    public final static int POSITION_UPPER_RIGHT = 3;
    public final static int POSITION_LOWER_LEFT  = 12;
    public final static int POSITION_LOWER_RIGHT = 6;

    public final static int SIZE_STANDARD   = 1; 
    public final static int SIZE_BEST_FIT   = 4;
    public final static int SIZE_FULLSCREEN = 8;

    private MjpegViewThread thread;
    private MjpegInputStream mIn = null;    
    private boolean showFps = false;
    private boolean mRun = false;
    private boolean surfaceDone = false;    
    private Paint overlayPaint;
    private int overlayTextColor;
    private int overlayBackgroundColor;
    private int ovlPos;
    private int dispWidth;
    private int dispHeight;
    private int displayMode;

    public class MjpegViewThread extends Thread {
        private SurfaceHolder mSurfaceHolder;
        private int frameCounter = 0;
        private long start;
        private Bitmap ovl;

        public MjpegViewThread(SurfaceHolder surfaceHolder, Context context) {
            mSurfaceHolder = surfaceHolder;
        }

        private Rect destRect(int bmw, int bmh) {
            int tempx;
            int tempy;
            if (displayMode == MjpegView.SIZE_STANDARD) {
                tempx = (dispWidth / 2) - (bmw / 2);
                tempy = (dispHeight / 2) - (bmh / 2);
                return new Rect(tempx, tempy, bmw + tempx, bmh + tempy);
            }
            if (displayMode == MjpegView.SIZE_BEST_FIT) {
                float bmasp = (float) bmw / (float) bmh;
                bmw = dispWidth;
                bmh = (int) (dispWidth / bmasp);
                if (bmh > dispHeight) {
                    bmh = dispHeight;
                    bmw = (int) (dispHeight * bmasp);
                }
                tempx = (dispWidth / 2) - (bmw / 2);
                tempy = (dispHeight / 2) - (bmh / 2);
                return new Rect(tempx, tempy, bmw + tempx, bmh + tempy);
            }
            if (displayMode == MjpegView.SIZE_FULLSCREEN){
                return new Rect(0, 0, dispWidth, dispHeight);
            }
            return null;
        }

        public void setSurfaceSize(int width, int height) {
            synchronized(mSurfaceHolder) {
                dispWidth = width;
                dispHeight = height;
            }
        }

        private Bitmap makeFpsOverlay(Paint p, String text) {
            Rect b = new Rect();
            p.getTextBounds(text, 0, text.length(), b);
            int bwidth  = b.width()+2;
            int bheight = b.height()+2;
            Bitmap bm = Bitmap.createBitmap(bwidth, bheight, Bitmap.Config.ARGB_8888);
            Canvas c = new Canvas(bm);
            p.setColor(overlayBackgroundColor);
            c.drawRect(0, 0, bwidth, bheight, p);
            p.setColor(overlayTextColor);
            c.drawText(text, -b.left+1, (bheight/2)-((p.ascent()+p.descent())/2)+1, p);
            return bm;           
        }

        public void run() {
            start = System.currentTimeMillis();
            PorterDuffXfermode mode = new PorterDuffXfermode(PorterDuff.Mode.DST_OVER);
            Bitmap bm;
            int width;
            int height;
            Rect destRect;
            Canvas c = null;
            Paint p = new Paint();
            String fps;
            while (mRun) {
                if(surfaceDone) {
                    try {
                        c = mSurfaceHolder.lockCanvas();
                        synchronized (mSurfaceHolder) {
                            try {
                                bm = mIn.readMjpegFrame();
                                destRect = destRect(bm.getWidth(),bm.getHeight());
                                c.drawColor(Color.BLACK);
                                c.drawBitmap(bm, null, destRect, p);
                                if(showFps) {
                                    p.setXfermode(mode);
                                    if(ovl != null) {
                                        height = ((ovlPos & 1) == 1) ? destRect.top : destRect.bottom-ovl.getHeight();
                                        width  = ((ovlPos & 8) == 8) ? destRect.left : destRect.right -ovl.getWidth();
                                        c.drawBitmap(ovl, width, height, null);
                                    }
                                    p.setXfermode(null);
                                    frameCounter++;
                                    if((System.currentTimeMillis() - start) >= 1000) {
                                        fps = String.valueOf(frameCounter)+" fps";
                                        frameCounter = 0; 
                                        start = System.currentTimeMillis();
                                        ovl = makeFpsOverlay(overlayPaint, fps);
                                    }
                                }
                            } catch (IOException e) {
                                e.getStackTrace();
                                Log.d(TAG, "catch IOException hit in run", e);
                            }
                        }
                    } finally { 
                        if (c != null) {
                            mSurfaceHolder.unlockCanvasAndPost(c); 
                        }
                    }
                }
            }
        }
    }

    private void init(Context context) {
        SurfaceHolder holder = getHolder();
        holder.addCallback(this);
        thread = new MjpegViewThread(holder, context);
        setFocusable(true);
        overlayPaint = new Paint();
        overlayPaint.setTextAlign(Paint.Align.LEFT);
        overlayPaint.setTextSize(12);
        overlayPaint.setTypeface(Typeface.DEFAULT);
        overlayTextColor = Color.WHITE;
        overlayBackgroundColor = Color.BLACK;
        ovlPos = MjpegView.POSITION_LOWER_RIGHT;
        displayMode = MjpegView.SIZE_STANDARD;
        dispWidth = getWidth();
        dispHeight = getHeight();
    }

    public void startPlayback() { 
        if(mIn != null) {
            mRun = true;
            thread.start();         
        }
    }

    public void stopPlayback() { 
        mRun = false;
        boolean retry = true;
        while(retry) {
            try {
                thread.join();
                retry = false;
            } catch (InterruptedException e) {
                e.getStackTrace();
                Log.d(TAG, "catch IOException hit in stopPlayback", e);
            }
        }
    }

    public MjpegView(Context context, AttributeSet attrs) { 
        super(context, attrs); init(context); 
    }

    public void surfaceChanged(SurfaceHolder holder, int f, int w, int h) { 
        thread.setSurfaceSize(w, h); 
    }

    public void surfaceDestroyed(SurfaceHolder holder) { 
        surfaceDone = false; 
        stopPlayback(); 
    }

    public MjpegView(Context context) { 
        super(context);
        init(context); 
    }

    public void surfaceCreated(SurfaceHolder holder) { 
        surfaceDone = true; 
    }

    public void showFps(boolean b) { 
        showFps = b; 
    }

    public void setSource(MjpegInputStream source) { 
        mIn = source;
        startPlayback();
    }

    public void setOverlayPaint(Paint p) { 
        overlayPaint = p; 
    }

    public void setOverlayTextColor(int c) { 
        overlayTextColor = c; 
    }

    public void setOverlayBackgroundColor(int c) { 
        overlayBackgroundColor = c; 
    }

    public void setOverlayPosition(int p) { 
        ovlPos = p; 
    }

    public void setDisplayMode(int s) { 
        displayMode = s; 
    }
}

Answer 1

nice work! For your problem with onResume(), isn't it enough when you move the following code from onCreate() to onResume()?

    //sample public cam 
    String URL = "http://trackfield.webcam.oregonstate.edu/axis-cgi/mjpg/video.cgi?resolution=800x600&amp%3bdummy=1333689998337"; 

    mv = new MjpegView(this); 
    setContentView(mv);         

    new DoRead().execute(URL); 

Then you simply recreate the View and new instance of the AsyncTask... I tried it and it works for me...

Answer 2

It'll be helpful for the newbies that if you want to access your ip camera having a username or password , you might want to add this to your DefaultHttpClient and the above code will work for cameras that require authentication

 CredentialsProvider provider = new BasicCredentialsProvider();
            UsernamePasswordCredentials credentials = new UsernamePasswordCredentials("yourusername", "yourpassword");
            provider.setCredentials(AuthScope.ANY, credentials);
            DefaultHttpClient httpclient = new DefaultHttpClient();
            httpclient.setCredentialsProvider(provider);

Answer 3

thanks for the code, it's very helpful

I want to suggest few optimization tips, which are already used in my code, overall performance can be easily increased by a few times.

1. I removed memory allocations during frame reading, where possible

    private final static int HEADER_MAX_LENGTH = 100; private final static int FRAME_MAX_LENGTH = 200000 + HEADER_MAX_LENGTH; private final String CONTENT_LENGTH = "Content-Length:"; private final String CONTENT_END = "\\r\\n"; private final static byte[] gFrameData = new byte[FRAME_MAX_LENGTH]; private final static byte[] gHeader = new byte[HEADER_MAX_LENGTH]; BitmapFactory.Options bitmapOptions = new BitmapFactory.Options(); public Bitmap readMjpegFrame() throws IOException { mark(FRAME_MAX_LENGTH); int headerLen = getStartOfSequence(SOI_MARKER); if(headerLen < 0) return false; reset(); readFully(gHeader, 0, headerLen); int contentLen; try { contentLen = parseContentLength(gHeader, headerLen); } catch (NumberFormatException nfe) { nfe.getStackTrace(); Log.d(TAG, "catch NumberFormatException hit", nfe); contentLen = getEndOfSequence(EOF_MARKER); } readFully(gFrameData, 0, contentLen); Bitmap bm = BitmapFactory.decodeByteArray(gFrameData, 0, contentLen, bitmapOptions); bitmapOptions.inBitmap = bm; return bm; } 

2. Optimizing parseContentLength, removing String operations as much as possible

    byte[] CONTENT_LENGTH_BYTES; byte[] CONTENT_END_BYTES; public MjpegInputStream(InputStream in) { super(new BufferedInputStream(in, FRAME_MAX_LENGTH)); bitmapOptions.inSampleSize = 1; bitmapOptions.inPreferredConfig = Bitmap.Config.RGB_565; bitmapOptions.inPreferQualityOverSpeed = false; bitmapOptions.inPurgeable = true; try { CONTENT_LENGTH_BYTES = CONTENT_LENGTH.getBytes("UTF-8"); CONTENT_END_BYTES = CONTENT_END.getBytes("UTF-8"); } catch (UnsupportedEncodingException e) { e.printStackTrace(); } } private int findPattern(byte[] buffer, int bufferLen, byte[] pattern, int offset) { int seqIndex = 0; for(int i=offset; i < bufferLen; ++i) { if(buffer[i] == pattern[seqIndex]) { ++seqIndex; if(seqIndex == pattern.length) { return i + 1; } } else { seqIndex = 0; } } return -1; } private int parseContentLength(byte[] headerBytes, int length) throws IOException, NumberFormatException { int begin = findPattern(headerBytes, length, CONTENT_LENGTH_BYTES, 0); int end = findPattern(headerBytes, length, CONTENT_END_BYTES, begin) - CONTENT_END_BYTES.length; // converting string to int int number = 0; int radix = 1; for(int i = end - 1; i >= begin; --i) { if(headerBytes[i] > 47 && headerBytes[i] < 58) { number += (headerBytes[i] - 48) * radix; radix *= 10; } } return number; } 

There could be mistakes in the code since I was rewriting it for stackoverflow, originally I'm using 2 threads, one is reading frames and another is rendering.

I hope it will help for someone.