Android ICS und MJPEG mit AsyncTask
Ich habe den MJPEG-Viewer-Code von geändertAndroid und MJPEG mit einer AsyncTask arbeiten (und damit Ice Cream Sandwich (ICS), 4.0.4) und hier ist mein Code.
Wenn jemand Vorschläge zur Optimierung, Bereinigung oder Verbesserung des Codes hat, lass es mich bitte wissen. Zwei Punkte, die ich gerne ansprechen möchte:
Wenn Sie das Gerät in einem Stream haben, sperren Sie den Bildschirm und entsperren Sie ihn. Die Wiedergabe wird erst fortgesetzt, wenn Sie die App beenden und wieder aufnehmen oder den Bildschirm drehen. Alle meine Versuche, OnResume () zu verwenden, um etwas zu tun, führten zu Abstürzen der App.
Insbesondere würde ich die AsyncTask gerne in MjpegInputStream.java zurückbekommen, konnte dies aber nicht zum Laufen bringen.
MjpegActivity.java:
<code>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&%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);
}
}
}
</code>MjpegInputStream.java:
<code>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));
}
}
</code>MjpegView.java:
<code>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;
}
}
</code>