[转]将Android变成一个网络摄像机：spydroid-ipcamera；能实时传输，几乎没有延迟

spydroid-ipcamera这个项目能够将Android设备变成一个漂亮的网络摄像机 ip camera。Spydroid是一个很小的app，能够将手机的摄像头和麦克风streams至你的浏览器或VLC。它是市场上最强大的工具，一种方法用来从智能手机传输音频/视频到您的电脑。H.264支持分辨率高达1080p和在手机上运行ICS或JB就能够支持AAC格式。

需要注意的是，此解决方案仅限于局域网，要想在公网环境下实现视频监控，则需要STUN协议的支持。

源码片段

public class SpydroidActivity extends FragmentActivity {
 
    static final public String TAG = "SpydroidActivity";
 
    public final int HANDSET = 0x01;
    public final int TABLET = 0x02;
 
    // We assume that the device is a phone
    public int device = HANDSET;
 
    private ViewPager mViewPager;
    private PowerManager.WakeLock mWakeLock;
    private SectionsPagerAdapter mAdapter;
    private SurfaceView mSurfaceView;
    private SpydroidApplication mApplication;
    private CustomHttpServer mHttpServer;
    private RtspServer mRtspServer;
 
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
 
        mApplication = (SpydroidApplication) getApplication();
 
        setContentView(R.layout.spydroid);
 
        if (findViewById(R.id.handset_pager) != null) {
 
            // Handset detected !
            mAdapter = new SectionsPagerAdapter(getSupportFragmentManager());
            mViewPager = (ViewPager) findViewById(R.id.handset_pager);
            setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);
            mSurfaceView = (SurfaceView)findViewById(R.id.handset_camera_view);
            SessionBuilder.getInstance().setSurfaceView(mSurfaceView);
            SessionBuilder.getInstance().setPreviewOrientation(90);
             
        } else {
 
            // Tablet detected !
            device = TABLET;
            mAdapter = new SectionsPagerAdapter(getSupportFragmentManager());
            mViewPager = (ViewPager) findViewById(R.id.tablet_pager);
            setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);
            SessionBuilder.getInstance().setPreviewOrientation(0);
             
        }
 
        mViewPager.setAdapter(mAdapter);
 
        // Remove the ads if this is the donate version of the app.
        if (mApplication.DONATE_VERSION) {
            ((LinearLayout)findViewById(R.id.adcontainer)).removeAllViews();
        }
 
        // Prevents the phone from going to sleep mode
        PowerManager pm = (PowerManager) getSystemService(Context.POWER_SERVICE);
        mWakeLock = pm.newWakeLock(PowerManager.FULL_WAKE_LOCK, "net.majorkernelpanic.spydroid.wakelock");
 
        // Starts the service of the HTTP server
        this.startService(new Intent(this,CustomHttpServer.class));
 
        // Starts the service of the RTSP server
        this.startService(new Intent(this,CustomRtspServer.class));
 
    }
 
    public void onStart() {
        super.onStart();
 
        // Lock screen
        mWakeLock.acquire();
 
        // Did the user disabled the notification ?
        if (mApplication.notificationEnabled) {
            Intent notificationIntent = new Intent(this, SpydroidActivity.class);
            PendingIntent pendingIntent = PendingIntent.getActivity(this, 0, notificationIntent, PendingIntent.FLAG_CANCEL_CURRENT);
 
            NotificationCompat.Builder builder = new NotificationCompat.Builder(this);
            Notification notification = builder.setContentIntent(pendingIntent)
                    .setWhen(System.currentTimeMillis())
                    .setTicker(getText(R.string.notification_title))
                    .setSmallIcon(R.drawable.icon)
                    .setContentTitle(getText(R.string.notification_title))
                    .setContentText(getText(R.string.notification_content)).build();
            notification.flags |= Notification.FLAG_ONGOING_EVENT;
            ((NotificationManager)getSystemService(Context.NOTIFICATION_SERVICE)).notify(0,notification);
        } else {
            removeNotification();
        }
 
        bindService(new Intent(this,CustomHttpServer.class), mHttpServiceConnection, Context.BIND_AUTO_CREATE);
        bindService(new Intent(this,CustomRtspServer.class), mRtspServiceConnection, Context.BIND_AUTO_CREATE);
 
    }
 
    @Override
    public void onStop() {
        super.onStop();
        // A WakeLock should only be released when isHeld() is true !
        if (mWakeLock.isHeld()) mWakeLock.release();
        if (mHttpServer != null) mHttpServer.removeCallbackListener(mHttpCallbackListener);
        unbindService(mHttpServiceConnection);
        if (mRtspServer != null) mRtspServer.removeCallbackListener(mRtspCallbackListener);
        unbindService(mRtspServiceConnection);
    }
 
    @Override
    public void onResume() {
        super.onResume();
        mApplication.applicationForeground = true;
    }
 
    @Override
    public void onPause() {
        super.onPause();
        mApplication.applicationForeground = false;
    }
 
    @Override
    public void onDestroy() {
        Log.d(TAG,"SpydroidActivity destroyed");
        super.onDestroy();
    }
 
    @Override   
    public void onBackPressed() {
        Intent setIntent = new Intent(Intent.ACTION_MAIN);
        setIntent.addCategory(Intent.CATEGORY_HOME);
        setIntent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
        startActivity(setIntent);
    }
 
    @Override   
    public boolean onCreateOptionsMenu(Menu menu) {
        MenuInflater inflater = getMenuInflater();
        inflater.inflate(R.menu.menu, menu);
        MenuItemCompat.setShowAsAction(menu.findItem(R.id.quit), 1);
        MenuItemCompat.setShowAsAction(menu.findItem(R.id.options), 1);
        return true;
    }
 
    @Override   
    public boolean onOptionsItemSelected(MenuItem item) {
        Intent intent;
 
        switch (item.getItemId()) {
        case R.id.options:
            // Starts QualityListActivity where user can change the streaming quality
            intent = new Intent(this.getBaseContext(),OptionsActivity.class);
            startActivityForResult(intent, 0);
            return true;
        case R.id.quit:
            quitSpydroid();
            return true;
        default:
            return super.onOptionsItemSelected(item);
        }
    }
 
    private void quitSpydroid() {
        // Removes notification
        if (mApplication.notificationEnabled) removeNotification();       
        // Kills HTTP server
        this.stopService(new Intent(this,CustomHttpServer.class));
        // Kills RTSP server
        this.stopService(new Intent(this,CustomRtspServer.class));
        // Returns to home menu
        finish();
    }
     
    private ServiceConnection mRtspServiceConnection = new ServiceConnection() {
 
        @Override
        public void onServiceConnected(ComponentName name, IBinder service) {
            mRtspServer = (CustomRtspServer) ((RtspServer.LocalBinder)service).getService();
            mRtspServer.addCallbackListener(mRtspCallbackListener);
            mRtspServer.start();
        }
 
        @Override
        public void onServiceDisconnected(ComponentName name) {}
 
    };
 
    private RtspServer.CallbackListener mRtspCallbackListener = new RtspServer.CallbackListener() {
 
        @Override
        public void onError(RtspServer server, Exception e, int error) {
            // We alert the user that the port is already used by another app.
            if (error == RtspServer.ERROR_BIND_FAILED) {
                new AlertDialog.Builder(SpydroidActivity.this)
                .setTitle(R.string.port_used)
                .setMessage(getString(R.string.bind_failed, "RTSP"))
                .setPositiveButton("OK", new DialogInterface.OnClickListener() {
                    public void onClick(final DialogInterface dialog, final int id) {
                        startActivityForResult(new Intent(SpydroidActivity.this, OptionsActivity.class),0);
                    }
                })
                .show();
            }
        }
 
        @Override
        public void onMessage(RtspServer server, int message) {
            if (message==RtspServer.MESSAGE_STREAMING_STARTED) {
                if (mAdapter != null && mAdapter.getHandsetFragment() != null) 
                    mAdapter.getHandsetFragment().update();
            } else if (message==RtspServer.MESSAGE_STREAMING_STOPPED) {
                if (mAdapter != null && mAdapter.getHandsetFragment() != null) 
                    mAdapter.getHandsetFragment().update();
            }
        }
 
    };  
 
    private ServiceConnection mHttpServiceConnection = new ServiceConnection() {
 
        @Override
        public void onServiceConnected(ComponentName name, IBinder service) {
            mHttpServer = (CustomHttpServer) ((TinyHttpServer.LocalBinder)service).getService();
            mHttpServer.addCallbackListener(mHttpCallbackListener);
            mHttpServer.start();
        }
 
        @Override
        public void onServiceDisconnected(ComponentName name) {}
 
    };
 
    private TinyHttpServer.CallbackListener mHttpCallbackListener = new TinyHttpServer.CallbackListener() {
 
        @Override
        public void onError(TinyHttpServer server, Exception e, int error) {
            // We alert the user that the port is already used by another app.
            if (error == TinyHttpServer.ERROR_HTTP_BIND_FAILED ||
                    error == TinyHttpServer.ERROR_HTTPS_BIND_FAILED) {
                String str = error==TinyHttpServer.ERROR_HTTP_BIND_FAILED?"HTTP":"HTTPS";
                new AlertDialog.Builder(SpydroidActivity.this)
                .setTitle(R.string.port_used)
                .setMessage(getString(R.string.bind_failed, str))
                .setPositiveButton("OK", new DialogInterface.OnClickListener() {
                    public void onClick(final DialogInterface dialog, final int id) {
                        startActivityForResult(new Intent(SpydroidActivity.this, OptionsActivity.class),0);
                    }
                })
                .show();
            }
        }
 
        @Override
        public void onMessage(TinyHttpServer server, int message) {
            if (message==CustomHttpServer.MESSAGE_STREAMING_STARTED) {
                if (mAdapter != null && mAdapter.getHandsetFragment() != null) 
                    mAdapter.getHandsetFragment().update();
                if (mAdapter != null && mAdapter.getPreviewFragment() != null)  
                    mAdapter.getPreviewFragment().update();
            } else if (message==CustomHttpServer.MESSAGE_STREAMING_STOPPED) {
                if (mAdapter != null && mAdapter.getHandsetFragment() != null) 
                    mAdapter.getHandsetFragment().update();
                if (mAdapter != null && mAdapter.getPreviewFragment() != null)  
                    mAdapter.getPreviewFragment().update();
            }
        }
 
    };
 
    private void removeNotification() {
        ((NotificationManager)getSystemService(Context.NOTIFICATION_SERVICE)).cancel(0);
    }
 
    public void log(String s) {
        Toast.makeText(getApplicationContext(), s, Toast.LENGTH_SHORT).show();
    }
 
    class SectionsPagerAdapter extends FragmentPagerAdapter {
 
        public SectionsPagerAdapter(FragmentManager fm) {
            super(fm);
        }
 
        @Override
        public Fragment getItem(int i) {
            if (device == HANDSET) {
                switch (i) {
                case 0: return new HandsetFragment();
                case 1: return new PreviewFragment();
                case 2: return new AboutFragment();
                }
            } else {
                switch (i) {
                case 0: return new TabletFragment();
                case 1: return new AboutFragment();
                }               
            }
            return null;
        }
 
        @Override
        public int getCount() {
            return device==HANDSET ? 3 : 2;
        }
 
        public HandsetFragment getHandsetFragment() {
            if (device == HANDSET) {
                return (HandsetFragment) getSupportFragmentManager().findFragmentByTag("android:switcher:"+R.id.handset_pager+":0");
            } else {
                return (HandsetFragment) getSupportFragmentManager().findFragmentById(R.id.handset);
            }
        }
 
        public PreviewFragment getPreviewFragment() {
            if (device == HANDSET) {
                return (PreviewFragment) getSupportFragmentManager().findFragmentByTag("android:switcher:"+R.id.handset_pager+":1");
            } else {
                return (PreviewFragment) getSupportFragmentManager().findFragmentById(R.id.preview);
            }
        }
 
        @Override
        public CharSequence getPageTitle(int position) {
            if (device == HANDSET) {
                switch (position) {
                case 0: return getString(R.string.page0);
                case 1: return getString(R.string.page1);
                case 2: return getString(R.string.page2);
                }               
            } else {
                switch (position) {
                case 0: return getString(R.string.page0);
                case 1: return getString(R.string.page2);
                }
            }
            return null;
        }
 
    }