refactored; added Camera2, notify callbacks, front/back maxCamera sizes; disable…

refactored; added Camera2, notify callbacks, front/back maxCamera sizes; disable new stuff if target API < 21

modules/java/CMakeLists.txt

@@ -181,6 +181,17 @@ else()
   list(REMOVE_ITEM handwrittren_lib_project_files_rel "${ANDROID_MANIFEST_FILE}")
 endif()
 
+#  Calc default SDK Target
+android_get_compatible_target(android_sdk_target ${ANDROID_NATIVE_API_LEVEL} ${ANDROID_SDK_TARGET} 11)
+string(REGEX REPLACE "android-" "" android_sdk_target_num ${android_sdk_target})
+
+if( (ANDROID_SDK_TARGET AND ANDROID_SDK_TARGET LESS 21) OR (android_sdk_target_num LESS 21) )
+  message(STATUS "[OpenCV for Android SDK]: A new OpenGL Camera Bridge (CameraGLSurfaceView, CameraGLRendererBase, CameraRenderer, Camera2Renderer) is disabled, because ANDROID_SDK_TARGET (${android_sdk_target_num}) < 21")
+  ocv_list_filterout(handwritten_java_sources "android\\\\+CameraGL")
+  ocv_list_filterout(handwritten_java_sources "android\\\\+Camera.?Renderer")
+endif()
+
+
 # IMPORTANT: add dependencies to cmake (we should rerun cmake if any of these files is modified)
 add_cmake_dependencies(${scripts_gen_java} ${scripts_hdr_parser} ${opencv_public_headers})
 

modules/java/generator/src/java/android+Camera2Renderer.java

+package org.opencv.android;
+
+import java.util.Arrays;
+import java.util.concurrent.Semaphore;
+import java.util.concurrent.TimeUnit;
+import android.annotation.TargetApi;
+import android.content.Context;
+import android.graphics.SurfaceTexture;
+import android.hardware.camera2.CameraAccessException;
+import android.hardware.camera2.CameraCaptureSession;
+import android.hardware.camera2.CameraCharacteristics;
+import android.hardware.camera2.CameraDevice;
+import android.hardware.camera2.CameraManager;
+import android.hardware.camera2.CaptureRequest;
+import android.hardware.camera2.params.StreamConfigurationMap;
+import android.os.Handler;
+import android.os.HandlerThread;
+import android.util.Log;
+import android.util.Size;
+import android.view.Surface;
+
+@TargetApi(21)
+public class Camera2Renderer extends CameraGLRendererBase {
+
+    protected final String LOGTAG = "Camera2Renderer";
+    private CameraDevice mCameraDevice;
+    private CameraCaptureSession mCaptureSession;
+    private CaptureRequest.Builder mPreviewRequestBuilder;
+    private String mCameraID;
+    private Size mPreviewSize = new Size(-1, -1);
+
+    private HandlerThread mBackgroundThread;
+    private Handler mBackgroundHandler;
+    private Semaphore mCameraOpenCloseLock = new Semaphore(1);
+
+    Camera2Renderer(CameraGLSurfaceView view) {
+        super(view);
+    }
+
+    @Override
+    protected void doStart() {
+        Log.d(LOGTAG, "doStart");
+        startBackgroundThread();
+        super.doStart();
+    }
+
+
+    @Override
+    protected void doStop() {
+        Log.d(LOGTAG, "doStop");
+        super.doStop();
+        stopBackgroundThread();
+    }
+
+    boolean cacPreviewSize(final int width, final int height) {
+        Log.i(LOGTAG, "cacPreviewSize: "+width+"x"+height);
+        if(mCameraID == null) {
+            Log.e(LOGTAG, "Camera isn't initialized!");
+            return false;
+        }
+        CameraManager manager = (CameraManager) mView.getContext()
+                .getSystemService(Context.CAMERA_SERVICE);
+        try {
+            CameraCharacteristics characteristics = manager
+                    .getCameraCharacteristics(mCameraID);
+            StreamConfigurationMap map = characteristics
+                    .get(CameraCharacteristics.SCALER_STREAM_CONFIGURATION_MAP);
+            int bestWidth = 0, bestHeight = 0;
+            float aspect = (float)width / height;
+            for (Size psize : map.getOutputSizes(SurfaceTexture.class)) {
+                int w = psize.getWidth(), h = psize.getHeight();
+                Log.d(LOGTAG, "trying size: "+w+"x"+h);
+                if ( width >= w && height >= h &&
+                     bestWidth <= w && bestHeight <= h &&
+                     Math.abs(aspect - (float)w/h) < 0.2 ) {
+                    bestWidth = w;
+                    bestHeight = h;
+                }
+            }
+            Log.i(LOGTAG, "best size: "+bestWidth+"x"+bestHeight);
+            if( bestWidth == 0 || bestHeight == 0 ||
+                mPreviewSize.getWidth() == bestWidth &&
+                mPreviewSize.getHeight() == bestHeight )
+                return false;
+            else {
+                mPreviewSize = new Size(bestWidth, bestHeight);
+                return true;
+            }
+        } catch (CameraAccessException e) {
+            Log.e(LOGTAG, "cacPreviewSize - Camera Access Exception");
+        } catch (IllegalArgumentException e) {
+            Log.e(LOGTAG, "cacPreviewSize - Illegal Argument Exception");
+        } catch (SecurityException e) {
+            Log.e(LOGTAG, "cacPreviewSize - Security Exception");
+        }
+        return false;
+    }
+
+    @Override
+    protected void openCamera(int id) {
+        Log.i(LOGTAG, "openCamera");
+        CameraManager manager = (CameraManager) mView.getContext().getSystemService(Context.CAMERA_SERVICE);
+        try {
+            String camList[] = manager.getCameraIdList();
+            if(camList.length == 0) {
+                Log.e(LOGTAG, "Error: camera isn't detected.");
+                return;
+            }
+            if(id == CameraBridgeViewBase.CAMERA_ID_ANY) {
+                mCameraID = camList[0];
+            } else {
+                for (String cameraID : camList) {
+                    CameraCharacteristics characteristics = manager.getCameraCharacteristics(cameraID);
+                    if( id == CameraBridgeViewBase.CAMERA_ID_BACK &&
+                        characteristics.get(CameraCharacteristics.LENS_FACING) == CameraCharacteristics.LENS_FACING_BACK ||
+                        id == CameraBridgeViewBase.CAMERA_ID_FRONT &&
+                        characteristics.get(CameraCharacteristics.LENS_FACING) == CameraCharacteristics.LENS_FACING_FRONT) {
+                        mCameraID = cameraID;
+                        break;
+                    }
+                }
+            }
+            if(mCameraID != null) {
+                if (!mCameraOpenCloseLock.tryAcquire(2500, TimeUnit.MILLISECONDS)) {
+                    throw new RuntimeException(
+                            "Time out waiting to lock camera opening.");
+                }
+                Log.i(LOGTAG, "Opening camera: " + mCameraID);
+                manager.openCamera(mCameraID, mStateCallback, mBackgroundHandler);
+            }
+        } catch (CameraAccessException e) {
+            Log.e(LOGTAG, "OpenCamera - Camera Access Exception");
+        } catch (IllegalArgumentException e) {
+            Log.e(LOGTAG, "OpenCamera - Illegal Argument Exception");
+        } catch (SecurityException e) {
+            Log.e(LOGTAG, "OpenCamera - Security Exception");
+        } catch (InterruptedException e) {
+            Log.e(LOGTAG, "OpenCamera - Interrupted Exception");
+        }
+    }
+
+    @Override
+    protected void closeCamera() {
+        Log.i(LOGTAG, "closeCamera");
+        try {
+            mCameraOpenCloseLock.acquire();
+            if (null != mCaptureSession) {
+                mCaptureSession.close();
+                mCaptureSession = null;
+            }
+            if (null != mCameraDevice) {
+                mCameraDevice.close();
+                mCameraDevice = null;
+            }
+        } catch (InterruptedException e) {
+            throw new RuntimeException("Interrupted while trying to lock camera closing.", e);
+        } finally {
+            mCameraOpenCloseLock.release();
+        }
+    }
+
+    private final CameraDevice.StateCallback mStateCallback = new CameraDevice.StateCallback() {
+
+        @Override
+        public void onOpened(CameraDevice cameraDevice) {
+            mCameraDevice = cameraDevice;
+            mCameraOpenCloseLock.release();
+            createCameraPreviewSession();
+        }
+
+        @Override
+        public void onDisconnected(CameraDevice cameraDevice) {
+            cameraDevice.close();
+            mCameraDevice = null;
+            mCameraOpenCloseLock.release();
+        }
+
+        @Override
+        public void onError(CameraDevice cameraDevice, int error) {
+            cameraDevice.close();
+            mCameraDevice = null;
+            mCameraOpenCloseLock.release();
+        }
+
+    };
+
+    private void createCameraPreviewSession() {
+        int w=mPreviewSize.getWidth(), h=mPreviewSize.getHeight();
+        Log.i(LOGTAG, "createCameraPreviewSession("+w+"x"+h+")");
+        if(w<0 || h<0)
+            return;
+        try {
+            mCameraOpenCloseLock.acquire();
+            if (null == mCameraDevice) {
+                mCameraOpenCloseLock.release();
+                Log.e(LOGTAG, "createCameraPreviewSession: camera isn't opened");
+                return;
+            }
+            if (null != mCaptureSession) {
+                mCameraOpenCloseLock.release();
+                Log.e(LOGTAG, "createCameraPreviewSession: mCaptureSession is already started");
+                return;
+            }
+            if(null == mSTexture) {
+                mCameraOpenCloseLock.release();
+                Log.e(LOGTAG, "createCameraPreviewSession: preview SurfaceTexture is null");
+                return;
+            }
+            mSTexture.setDefaultBufferSize(w, h);
+
+            Surface surface = new Surface(mSTexture);
+
+            mPreviewRequestBuilder = mCameraDevice
+                    .createCaptureRequest(CameraDevice.TEMPLATE_PREVIEW);
+            mPreviewRequestBuilder.addTarget(surface);
+
+            mCameraDevice.createCaptureSession(Arrays.asList(surface),
+                    new CameraCaptureSession.StateCallback() {
+                        @Override
+                        public void onConfigured( CameraCaptureSession cameraCaptureSession) {
+                            mCaptureSession = cameraCaptureSession;
+                            try {
+                                mPreviewRequestBuilder.set(CaptureRequest.CONTROL_AF_MODE, CaptureRequest.CONTROL_AF_MODE_CONTINUOUS_PICTURE);
+                                mPreviewRequestBuilder.set(CaptureRequest.CONTROL_AE_MODE, CaptureRequest.CONTROL_AE_MODE_ON_AUTO_FLASH);
+
+                                mCaptureSession.setRepeatingRequest(mPreviewRequestBuilder.build(), null, mBackgroundHandler);
+                                Log.i(LOGTAG, "CameraPreviewSession has been started");
+                            } catch (CameraAccessException e) {
+                                Log.e(LOGTAG, "createCaptureSession failed");
+                            }
+                            mCameraOpenCloseLock.release();
+                        }
+
+                        @Override
+                        public void onConfigureFailed(
+                                CameraCaptureSession cameraCaptureSession) {
+                            Log.e(LOGTAG, "createCameraPreviewSession failed");
+                            mCameraOpenCloseLock.release();
+                        }
+                    }, mBackgroundHandler);
+        } catch (CameraAccessException e) {
+            Log.e(LOGTAG, "createCameraPreviewSession");
+        } catch (InterruptedException e) {
+            throw new RuntimeException(
+                    "Interrupted while createCameraPreviewSession", e);
+        }
+        finally {
+            //mCameraOpenCloseLock.release();
+        }
+    }
+
+    private void startBackgroundThread() {
+        Log.i(LOGTAG, "startBackgroundThread");
+        stopBackgroundThread();
+        mBackgroundThread = new HandlerThread("CameraBackground");
+        mBackgroundThread.start();
+        mBackgroundHandler = new Handler(mBackgroundThread.getLooper());
+    }
+
+    private void stopBackgroundThread() {
+        Log.i(LOGTAG, "stopBackgroundThread");
+        if(mBackgroundThread == null)
+            return;
+        mBackgroundThread.quitSafely();
+        try {
+            mBackgroundThread.join();
+            mBackgroundThread = null;
+            mBackgroundHandler = null;
+        } catch (InterruptedException e) {
+            Log.e(LOGTAG, "stopBackgroundThread");
+        }
+    }
+
+    @Override
+    protected void setCameraPreviewSize(int width, int height) {
+        Log.i(LOGTAG, "setCameraPreviewSize("+width+"x"+height+")");
+        if(mMaxCameraWidth  > 0 && mMaxCameraWidth  < width)  width  = mMaxCameraWidth;
+        if(mMaxCameraHeight > 0 && mMaxCameraHeight < height) height = mMaxCameraHeight;
+        try {
+            mCameraOpenCloseLock.acquire();
+
+            boolean needReconfig = cacPreviewSize(width, height);
+            mCameraWidth  = mPreviewSize.getWidth();
+            mCameraHeight = mPreviewSize.getHeight();
+
+            if( !needReconfig ) {
+                mCameraOpenCloseLock.release();
+                return;
+            }
+            if (null != mCaptureSession) {
+                Log.d(LOGTAG, "closing existing previewSession");
+                mCaptureSession.close();
+                mCaptureSession = null;
+            }
+            mCameraOpenCloseLock.release();
+            createCameraPreviewSession();
+        } catch (InterruptedException e) {
+            mCameraOpenCloseLock.release();
+            throw new RuntimeException("Interrupted while setCameraPreviewSize.", e);
+        }
+    }
+}

modules/java/generator/src/java/android+CameraGLRendererBase.java

+package org.opencv.android;
+
+import java.nio.ByteBuffer;
+import java.nio.ByteOrder;
+import java.nio.FloatBuffer;
+
+import javax.microedition.khronos.egl.EGLConfig;
+import javax.microedition.khronos.opengles.GL10;
+
+import org.opencv.android.CameraGLSurfaceView.CameraTextureListener;
+
+import android.annotation.TargetApi;
+import android.graphics.SurfaceTexture;
+import android.opengl.GLES11Ext;
+import android.opengl.GLES20;
+import android.opengl.GLSurfaceView;
+import android.util.Log;
+import android.view.View;
+
+@TargetApi(15)
+public abstract class CameraGLRendererBase implements GLSurfaceView.Renderer, SurfaceTexture.OnFrameAvailableListener {
+
+    protected final String LOGTAG = "CameraGLRendererBase";
+
+    // shaders
+    private final String vss = ""
+            + "attribute vec2 vPosition;\n"
+            + "attribute vec2 vTexCoord;\n" + "varying vec2 texCoord;\n"
+            + "void main() {\n" + "  texCoord = vTexCoord;\n"
+            + "  gl_Position = vec4 ( vPosition.x, vPosition.y, 0.0, 1.0 );\n"
+            + "}";
+
+    private final String fssOES = ""
+            + "#extension GL_OES_EGL_image_external : require\n"
+            + "precision mediump float;\n"
+            + "uniform samplerExternalOES sTexture;\n"
+            + "varying vec2 texCoord;\n"
+            + "void main() {\n"
+            + "  gl_FragColor = texture2D(sTexture,texCoord);\n" + "}";
+
+    private final String fss2D = ""
+            + "precision mediump float;\n"
+            + "uniform sampler2D sTexture;\n"
+            + "varying vec2 texCoord;\n"
+            + "void main() {\n"
+            + "  gl_FragColor = texture2D(sTexture,texCoord);\n" + "}";
+
+    // coord-s
+    private final float vertices[] = {
+           -1, -1,
+           -1,  1,
+            1, -1,
+            1,  1 };
+    private final float texCoordOES[] = {
+            0,  1,
+            0,  0,
+            1,  1,
+            1,  0 };
+    private final float texCoord2D[] = {
+            0,  0,
+            0,  1,
+            1,  0,
+            1,  1 };
+
+    private int[] texCamera = {0}, texFBO = {0}, texDraw = {0};
+    private int[] FBO = {0};
+    private int progOES = -1, prog2D = -1;
+    private int vPosOES, vTCOES, vPos2D, vTC2D;
+
+    private FloatBuffer vert, texOES, tex2D;
+
+    protected int mCameraWidth = -1, mCameraHeight = -1;
+    protected int mFBOWidth = -1, mFBOHeight = -1;
+    protected int mMaxCameraWidth = -1, mMaxCameraHeight = -1;
+    protected int mCameraIndex = CameraBridgeViewBase.CAMERA_ID_ANY;
+
+    protected SurfaceTexture mSTexture;
+
+    protected boolean mHaveSurface = false;
+    protected boolean mHaveFBO = false;
+    protected boolean mUpdateST = false;
+    protected boolean mEnabled = true;
+    protected boolean mIsStarted = false;
+
+    protected CameraGLSurfaceView mView;
+
+    protected abstract void openCamera(int id);
+    protected abstract void closeCamera();
+    protected abstract void setCameraPreviewSize(int width, int height); // updates mCameraWidth & mCameraHeight
+
+    public CameraGLRendererBase(CameraGLSurfaceView view) {
+        mView = view;
+        int bytes = vertices.length * Float.SIZE / Byte.SIZE;
+        vert   = ByteBuffer.allocateDirect(bytes).order(ByteOrder.nativeOrder()).asFloatBuffer();
+        texOES = ByteBuffer.allocateDirect(bytes).order(ByteOrder.nativeOrder()).asFloatBuffer();
+        tex2D  = ByteBuffer.allocateDirect(bytes).order(ByteOrder.nativeOrder()).asFloatBuffer();
+        vert.put(vertices).position(0);
+        texOES.put(texCoordOES).position(0);
+        tex2D.put(texCoord2D).position(0);
+    }
+
+    @Override
+    public synchronized void onFrameAvailable(SurfaceTexture surfaceTexture) {
+        //Log.i(LOGTAG, "onFrameAvailable");
+        mUpdateST = true;
+        mView.requestRender();
+    }
+
+    @Override
+    public void onDrawFrame(GL10 gl) {
+        //Log.i(LOGTAG, "onDrawFrame start");
+
+        if (!mHaveFBO)
+            return;
+
+        synchronized(this) {
+            if (mUpdateST) {
+                mSTexture.updateTexImage();
+                mUpdateST = false;
+            }
+
+            GLES20.glClear(GLES20.GL_COLOR_BUFFER_BIT);
+
+            CameraTextureListener texListener = mView.getCameraTextureListener();
+            if(texListener != null) {
+                //Log.d(LOGTAG, "haveUserCallback");
+                // texCamera(OES) -> texFBO
+                drawTex(texCamera[0], true, FBO[0]);
+
+                // call user code (texFBO -> texDraw)
+                boolean modified = texListener.onCameraTexture(texFBO[0], texDraw[0], mCameraWidth, mCameraHeight);
+
+                if(modified) {
+                    // texDraw -> screen
+                    drawTex(texDraw[0], false, 0);
+                } else {
+                    // texFBO -> screen
+                    drawTex(texFBO[0], false, 0);
+                }
+            } else {
+                Log.d(LOGTAG, "texCamera(OES) -> screen");
+                // texCamera(OES) -> screen
+                drawTex(texCamera[0], true, 0);
+            }
+            //Log.i(LOGTAG, "onDrawFrame end");
+        }
+    }
+
+    @Override
+    public void onSurfaceChanged(GL10 gl, int surfaceWidth, int surfaceHeight) {
+        Log.i(LOGTAG, "onSurfaceChanged("+surfaceWidth+"x"+surfaceHeight+")");
+        mHaveSurface = true;
+        updateState();
+        setPreviewSize(surfaceWidth, surfaceHeight);
+    }
+
+    @Override
+    public void onSurfaceCreated(GL10 gl, EGLConfig config) {
+        Log.i(LOGTAG, "onSurfaceCreated");
+        initShaders();
+    }
+
+    private void initShaders() {
+        String strGLVersion = GLES20.glGetString(GLES20.GL_VERSION);
+        if (strGLVersion != null)
+            Log.i(LOGTAG, "OpenGL ES version: " + strGLVersion);
+
+        GLES20.glClearColor(1.0f, 1.0f, 1.0f, 1.0f);
+
+        progOES = loadShader(vss, fssOES);
+        vPosOES = GLES20.glGetAttribLocation(progOES, "vPosition");
+        vTCOES  = GLES20.glGetAttribLocation(progOES, "vTexCoord");
+        GLES20.glEnableVertexAttribArray(vPosOES);
+        GLES20.glEnableVertexAttribArray(vTCOES);
+
+        prog2D  = loadShader(vss, fss2D);
+        vPos2D = GLES20.glGetAttribLocation(prog2D, "vPosition");
+        vTC2D  = GLES20.glGetAttribLocation(prog2D, "vTexCoord");
+        GLES20.glEnableVertexAttribArray(vPos2D);
+        GLES20.glEnableVertexAttribArray(vTC2D);
+    }
+
+    private void initSurfaceTexture() {
+        Log.d(LOGTAG, "initSurfaceTexture");
+        deleteSurfaceTexture();
+        initTexOES(texCamera);
+        mSTexture = new SurfaceTexture(texCamera[0]);
+        mSTexture.setOnFrameAvailableListener(this);
+    }
+
+    private void deleteSurfaceTexture() {
+        Log.d(LOGTAG, "deleteSurfaceTexture");
+        if(mSTexture != null) {
+            mSTexture.release();
+            mSTexture = null;
+            deleteTex(texCamera);
+        }
+    }
+
+    private void initTexOES(int[] tex) {
+        if(tex.length == 1) {
+            GLES20.glGenTextures(1, tex, 0);
+            GLES20.glBindTexture(GLES11Ext.GL_TEXTURE_EXTERNAL_OES, tex[0]);
+            GLES20.glTexParameteri(GLES11Ext.GL_TEXTURE_EXTERNAL_OES, GLES20.GL_TEXTURE_WRAP_S, GLES20.GL_CLAMP_TO_EDGE);
+            GLES20.glTexParameteri(GLES11Ext.GL_TEXTURE_EXTERNAL_OES, GLES20.GL_TEXTURE_WRAP_T, GLES20.GL_CLAMP_TO_EDGE);
+            GLES20.glTexParameteri(GLES11Ext.GL_TEXTURE_EXTERNAL_OES, GLES20.GL_TEXTURE_MIN_FILTER, GLES20.GL_NEAREST);
+            GLES20.glTexParameteri(GLES11Ext.GL_TEXTURE_EXTERNAL_OES, GLES20.GL_TEXTURE_MAG_FILTER, GLES20.GL_NEAREST);
+        }
+    }
+
+    private static void deleteTex(int[] tex) {
+        if(tex.length == 1) {
+            GLES20.glDeleteTextures(1, tex, 0);
+        }
+    }
+
+    private static int loadShader(String vss, String fss) {
+        Log.d("CameraGLRendererBase", "loadShader");
+        int vshader = GLES20.glCreateShader(GLES20.GL_VERTEX_SHADER);
+        GLES20.glShaderSource(vshader, vss);
+        GLES20.glCompileShader(vshader);
+        int[] compiled = new int[1];
+        GLES20.glGetShaderiv(vshader, GLES20.GL_COMPILE_STATUS, compiled, 0);
+        if (compiled[0] == 0) {
+            Log.e("CameraGLRendererBase", "Could not compile vertex shader: "+GLES20.glGetShaderInfoLog(vshader));
+            GLES20.glDeleteShader(vshader);
+            vshader = 0;
+            return 0;
+        }
+
+        int fshader = GLES20.glCreateShader(GLES20.GL_FRAGMENT_SHADER);
+        GLES20.glShaderSource(fshader, fss);
+        GLES20.glCompileShader(fshader);
+        GLES20.glGetShaderiv(fshader, GLES20.GL_COMPILE_STATUS, compiled, 0);
+        if (compiled[0] == 0) {
+            Log.e("CameraGLRendererBase", "Could not compile fragment shader:"+GLES20.glGetShaderInfoLog(fshader));
+            GLES20.glDeleteShader(vshader);
+            GLES20.glDeleteShader(fshader);
+            fshader = 0;
+            return 0;
+        }
+
+        int program = GLES20.glCreateProgram();
+        GLES20.glAttachShader(program, vshader);
+        GLES20.glAttachShader(program, fshader);
+        GLES20.glLinkProgram(program);
+        Log.d("CameraGLRendererBase", "shaders were compiled OK");
+        GLES20.glDeleteShader(vshader);
+        GLES20.glDeleteShader(fshader);
+
+        return program;
+    }
+
+    private void deleteFBO()
+    {
+        Log.d(LOGTAG, "deleteFBO("+mFBOWidth+"x"+mFBOHeight+")");
+        GLES20.glBindFramebuffer(GLES20.GL_FRAMEBUFFER, 0);
+        GLES20.glDeleteFramebuffers(1, FBO, 0);
+
+        deleteTex(texFBO);
+        deleteTex(texDraw);
+        mFBOWidth = mFBOHeight = 0;
+    }
+
+    private void initFBO(int width, int height)
+    {
+        Log.d(LOGTAG, "initFBO("+width+"x"+height+")");
+
+        deleteFBO();
+
+        GLES20.glGenTextures(1, texDraw, 0);
+        GLES20.glBindTexture(GLES20.GL_TEXTURE_2D, texDraw[0]);
+        GLES20.glTexImage2D(GLES20.GL_TEXTURE_2D, 0, GLES20.GL_RGBA, width, height, 0, GLES20.GL_RGBA, GLES20.GL_UNSIGNED_BYTE, null);
+        GLES20.glTexParameteri(GLES20.GL_TEXTURE_2D, GLES20.GL_TEXTURE_WRAP_S, GLES20.GL_CLAMP_TO_EDGE);
+        GLES20.glTexParameteri(GLES20.GL_TEXTURE_2D, GLES20.GL_TEXTURE_WRAP_T, GLES20.GL_CLAMP_TO_EDGE);
+        GLES20.glTexParameteri(GLES20.GL_TEXTURE_2D, GLES20.GL_TEXTURE_MIN_FILTER, GLES20.GL_NEAREST);
+        GLES20.glTexParameteri(GLES20.GL_TEXTURE_2D, GLES20.GL_TEXTURE_MAG_FILTER, GLES20.GL_NEAREST);
+
+        GLES20.glGenTextures(1, texFBO, 0);
+        GLES20.glBindTexture(GLES20.GL_TEXTURE_2D, texFBO[0]);
+        GLES20.glTexImage2D(GLES20.GL_TEXTURE_2D, 0, GLES20.GL_RGBA, width, height, 0, GLES20.GL_RGBA, GLES20.GL_UNSIGNED_BYTE, null);
+        GLES20.glTexParameteri(GLES20.GL_TEXTURE_2D, GLES20.GL_TEXTURE_WRAP_S, GLES20.GL_CLAMP_TO_EDGE);
+        GLES20.glTexParameteri(GLES20.GL_TEXTURE_2D, GLES20.GL_TEXTURE_WRAP_T, GLES20.GL_CLAMP_TO_EDGE);
+        GLES20.glTexParameteri(GLES20.GL_TEXTURE_2D, GLES20.GL_TEXTURE_MIN_FILTER, GLES20.GL_NEAREST);
+        GLES20.glTexParameteri(GLES20.GL_TEXTURE_2D, GLES20.GL_TEXTURE_MAG_FILTER, GLES20.GL_NEAREST);
+
+        //int hFBO;
+        GLES20.glGenFramebuffers(1, FBO, 0);
+        GLES20.glBindFramebuffer(GLES20.GL_FRAMEBUFFER, FBO[0]);
+        GLES20.glFramebufferTexture2D(GLES20.GL_FRAMEBUFFER, GLES20.GL_COLOR_ATTACHMENT0, GLES20.GL_TEXTURE_2D, texFBO[0], 0);
+        Log.d(LOGTAG, "initFBO error status: " + GLES20.glGetError());
+
+        int FBOstatus = GLES20.glCheckFramebufferStatus(GLES20.GL_FRAMEBUFFER);
+        if (FBOstatus != GLES20.GL_FRAMEBUFFER_COMPLETE)
+            Log.e(LOGTAG, "initFBO failed, status: " + FBOstatus);
+
+        mFBOWidth  = width;
+        mFBOHeight = height;
+    }
+
+    // draw texture to FBO or to screen if fbo == 0
+    private void drawTex(int tex, boolean isOES, int fbo)
+    {
+        GLES20.glBindFramebuffer(GLES20.GL_FRAMEBUFFER, fbo);
+
+        if(fbo == 0)
+            GLES20.glViewport(0, 0, mView.getWidth(), mView.getHeight());
+        else
+            GLES20.glViewport(0, 0, mFBOWidth, mFBOHeight);
+
+        GLES20.glClear(GLES20.GL_COLOR_BUFFER_BIT);
+
+        if(isOES) {
+            GLES20.glUseProgram(progOES);
+            GLES20.glVertexAttribPointer(vPosOES, 2, GLES20.GL_FLOAT, false, 4*2, vert);
+            GLES20.glVertexAttribPointer(vTCOES,  2, GLES20.GL_FLOAT, false, 4*2, texOES);
+        } else {
+            GLES20.glUseProgram(prog2D);
+            GLES20.glVertexAttribPointer(vPos2D, 2, GLES20.GL_FLOAT, false, 4*2, vert);
+            GLES20.glVertexAttribPointer(vTC2D,  2, GLES20.GL_FLOAT, false, 4*2, tex2D);
+        }
+
+        GLES20.glActiveTexture(GLES20.GL_TEXTURE0);
+
+        if(isOES) {
+            GLES20.glBindTexture(GLES11Ext.GL_TEXTURE_EXTERNAL_OES, tex);
+            GLES20.glUniform1i(GLES20.glGetUniformLocation(progOES, "sTexture"), 0);
+        } else {
+            GLES20.glBindTexture(GLES20.GL_TEXTURE_2D, tex);
+            GLES20.glUniform1i(GLES20.glGetUniformLocation(prog2D, "sTexture"), 0);
+        }
+
+        GLES20.glDrawArrays(GLES20.GL_TRIANGLE_STRIP, 0, 4);
+        GLES20.glFlush();
+    }
+
+    public synchronized void enableView() {
+        Log.d(LOGTAG, "enableView");
+        mEnabled = true;
+        updateState();
+    }
+
+    public synchronized void disableView() {
+        Log.d(LOGTAG, "disableView");
+        mEnabled = false;
+        updateState();
+    }
+
+    protected void updateState() {
+        Log.d(LOGTAG, "updateState");
+        Log.d(LOGTAG, "mEnabled="+mEnabled+", mHaveSurface="+mHaveSurface);
+        boolean willStart = mEnabled && mHaveSurface && mView.getVisibility() == View.VISIBLE;
+        if (willStart != mIsStarted) {
+            if(willStart) doStart();
+            else doStop();
+        } else {
+            Log.d(LOGTAG, "keeping State unchanged");
+        }
+        Log.d(LOGTAG, "updateState end");
+    }
+
+    protected synchronized void doStart() {
+        Log.d(LOGTAG, "doStart");
+        initSurfaceTexture();
+        openCamera(mCameraIndex);
+        mIsStarted = true;
+        if(mCameraWidth>0 && mCameraHeight>0)
+            setPreviewSize(mCameraWidth, mCameraHeight); // start preview and call listener.onCameraViewStarted()
+    }
+
+
+    protected void doStop() {
+        Log.d(LOGTAG, "doStop");
+        synchronized(this) {
+            mUpdateST = false;
+            mIsStarted = false;
+            mHaveFBO = false;
+            closeCamera();
+            deleteSurfaceTexture();
+        }
+        CameraTextureListener listener = mView.getCameraTextureListener();
+        if(listener != null) listener.onCameraViewStopped();
+
+    }
+
+    protected void setPreviewSize(int width, int height) {
+        synchronized(this) {
+            mHaveFBO = false;
+            mCameraWidth  = width;
+            mCameraHeight = height;
+            setCameraPreviewSize(width, height); // can change mCameraWidth & mCameraHeight
+            initFBO(mCameraWidth, mCameraHeight);
+            mHaveFBO = true;
+        }
+
+        CameraTextureListener listener = mView.getCameraTextureListener();
+        if(listener != null) listener.onCameraViewStarted(mCameraWidth, mCameraHeight);
+    }
+
+    public void setCameraIndex(int cameraIndex) {
+        disableView();
+        mCameraIndex = cameraIndex;
+        enableView();
+    }
+
+    public void setMaxCameraPreviewSize(int maxWidth, int maxHeight) {
+        disableView();
+        mMaxCameraWidth  = maxWidth;
+        mMaxCameraHeight = maxHeight;
+        enableView();
+    }
+
+    public void onResume() {
+        Log.i(LOGTAG, "onResume");
+    }
+
+    public void onPause() {
+        Log.i(LOGTAG, "onPause");
+        mHaveSurface = false;
+        updateState();
+        mCameraWidth = mCameraHeight = -1;
+    }
+
+}

modules/java/generator/src/java/android+CameraGLSurfaceView.java

 package org.opencv.android;
 
-import org.opencv.android.CameraBridgeViewBase.CvCameraViewFrame;
-import org.opencv.core.Mat;
+import org.opencv.R;
 
-import android.app.Activity;
 import android.content.Context;
+import android.content.res.TypedArray;
 import android.opengl.GLSurfaceView;
 import android.util.AttributeSet;
-import android.view.MotionEvent;
+import android.util.Log;
 import android.view.SurfaceHolder;
-import android.widget.TextView;
 
 public class CameraGLSurfaceView extends GLSurfaceView {
 
+    private static final String LOGTAG = "CameraGLSurfaceView";
+
     public interface CameraTextureListener {
         /**
          * This method is invoked when camera preview has started. After this method is invoked
@@ -29,24 +29,33 @@ public class CameraGLSurfaceView extends GLSurfaceView {
         public void onCameraViewStopped();
 
         /**
-         * This method is invoked when delivery of the frame needs to be done.
-         * The returned values - is a modified frame which needs to be displayed on the screen.
-         * TODO: pass the parameters specifying the format of the frame (BPP, YUV or RGB and etc)
+         * This method is invoked when a new preview frame from Camera is ready.
+         * @param texIn -  the OpenGL texture ID that contains frame in RGBA format
+         * @param texOut - the OpenGL texture ID that can be used to store modified frame image t display
+         * @param width -  the width of the frame
+         * @param height - the height of the frame
+         * @return `true` if `texOut` should be displayed, `false` - to show `texIn`
          */
-        public boolean onCameraFrame(int texIn, int texOut, int width, int height);
+        public boolean onCameraTexture(int texIn, int texOut, int width, int height);
     };
 
     private CameraTextureListener mTexListener;
-    private CameraRenderer mRenderer;
+    private CameraGLRendererBase mRenderer;
 
     public CameraGLSurfaceView(Context context, AttributeSet attrs) {
         super(context, attrs);
 
-        /*if(android.os.Build.VERSION.SDK_INT >= 21)
+        TypedArray styledAttrs = getContext().obtainStyledAttributes(attrs, R.styleable.CameraBridgeViewBase);
+        int cameraIndex = styledAttrs.getInt(R.styleable.CameraBridgeViewBase_camera_id, -1);
+        styledAttrs.recycle();
+
+        if(android.os.Build.VERSION.SDK_INT >= 21)
             mRenderer = new Camera2Renderer(this);
-        else*/
+        else
             mRenderer = new CameraRenderer(this);
 
+        setCameraIndex(cameraIndex);
+
         setEGLContextClientVersion(2);
         setRenderer(mRenderer);
         setRenderMode(GLSurfaceView.RENDERMODE_WHEN_DIRTY);
@@ -62,6 +71,14 @@ public class CameraGLSurfaceView extends GLSurfaceView {
         return mTexListener;
     }
 
+    public void setCameraIndex(int cameraIndex) {
+        mRenderer.setCameraIndex(cameraIndex);
+    }
+
+    public void setMaxCameraPreviewSize(int maxWidth, int maxHeight) {
+        mRenderer.setMaxCameraPreviewSize(maxWidth, maxHeight);
+    }
+
     @Override
     public void surfaceCreated(SurfaceHolder holder) {
         super.surfaceCreated(holder);
@@ -69,6 +86,7 @@ public class CameraGLSurfaceView extends GLSurfaceView {
 
     @Override
     public void surfaceDestroyed(SurfaceHolder holder) {
+        mRenderer.mHaveSurface = false;
         super.surfaceDestroyed(holder);
     }
 
@@ -79,20 +97,23 @@ public class CameraGLSurfaceView extends GLSurfaceView {
 
     @Override
     public void onResume() {
+        Log.i(LOGTAG, "onResume");
         super.onResume();
         mRenderer.onResume();
     }
 
     @Override
     public void onPause() {
+        Log.i(LOGTAG, "onPause");
         mRenderer.onPause();
         super.onPause();
     }
 
-    @Override
-    public boolean onTouchEvent(MotionEvent e) {
-        if(e.getAction() == MotionEvent.ACTION_DOWN)
-            ((Activity)getContext()).openOptionsMenu();
-        return true;
+    public void enableView() {
+        mRenderer.enableView();
+    }
+
+    public void disableView() {
+        mRenderer.disableView();
     }
 }

modules/java/generator/src/java/android+CameraRenderer.java

 package org.opencv.android;
 
 import java.io.IOException;
-import java.nio.ByteBuffer;
-import java.nio.ByteOrder;
-import java.nio.FloatBuffer;
-import java.nio.IntBuffer;
 import java.util.List;
 
-import javax.microedition.khronos.egl.EGLConfig;
-import javax.microedition.khronos.opengles.GL10;
-
-import org.opencv.android.CameraGLSurfaceView.CameraTextureListener;
-
-import android.opengl.GLES11Ext;
-import android.opengl.GLES20;
-import android.opengl.GLSurfaceView;
-import android.os.Build;
-import android.util.Log;
 import android.annotation.TargetApi;
-import android.graphics.SurfaceTexture;
 import android.hardware.Camera;
 import android.hardware.Camera.Size;
+import android.os.Build;
+import android.util.Log;
 
 @TargetApi(15)
-public class CameraRenderer implements GLSurfaceView.Renderer,
-        SurfaceTexture.OnFrameAvailableListener {
+@SuppressWarnings("deprecation")
+public class CameraRenderer extends CameraGLRendererBase {
 
     public static final String LOGTAG = "CameraRenderer";
 
-    // shaders
-    private final String vss = ""
-            + "attribute vec2 vPosition;\n"
-            + "attribute vec2 vTexCoord;\n" + "varying vec2 texCoord;\n"
-            + "void main() {\n" + "  texCoord = vTexCoord;\n"
-            + "  gl_Position = vec4 ( vPosition.x, vPosition.y, 0.0, 1.0 );\n"
-            + "}";
-
-    private final String fssOES = ""
-            + "#extension GL_OES_EGL_image_external : require\n"
-            + "precision mediump float;\n"
-            + "uniform samplerExternalOES sTexture;\n"
-            + "varying vec2 texCoord;\n"
-            + "void main() {\n"
-            + "  gl_FragColor = texture2D(sTexture,texCoord);\n" + "}";
-
-    private final String fss2D = ""
-            + "precision mediump float;\n"
-            + "uniform sampler2D sTexture;\n"
-            + "varying vec2 texCoord;\n"
-            + "void main() {\n"
-            + "  gl_FragColor = texture2D(sTexture,texCoord);\n" + "}";
-
-    // coord-s
-    private final float vertices[] = {
-           -1, -1,
-           -1,  1,
-            1, -1,
-            1,  1 };
-    private final float texCoordOES[] = {
-            0,  1,
-            0,  0,
-            1,  1,
-            1,  0 };
-    private final float texCoord2D[] = {
-            0,  0,
-            0,  1,
-            1,  0,
-            1,  1 };
-
-    private int[] texCamera = {0}, texFBO = {0}, texDraw = {0};
-    private int[] FBO = {0};
-    private int progOES, prog2D;
-    private int vPosOES, vTCOES, vPos2D, vTC2D;
-
-    private FloatBuffer vert, texOES, tex2D;
-
     private Camera mCamera;
     private boolean mPreviewStarted = false;
-    private int mPreviewWidth, mPreviewHeight;
-
-    private SurfaceTexture mSTexture;
-
-    private boolean mGLInit = false;
-    private boolean mUpdateST = false;
-
-    private CameraGLSurfaceView mView;
 
     CameraRenderer(CameraGLSurfaceView view) {
-        mView = view;
-        int bytes = vertices.length * Float.SIZE / Byte.SIZE;
-        vert   = ByteBuffer.allocateDirect(bytes).order(ByteOrder.nativeOrder()).asFloatBuffer();
-        texOES = ByteBuffer.allocateDirect(bytes).order(ByteOrder.nativeOrder()).asFloatBuffer();
-        tex2D  = ByteBuffer.allocateDirect(bytes).order(ByteOrder.nativeOrder()).asFloatBuffer();
-        vert.put(vertices).position(0);
-        texOES.put(texCoordOES).position(0);
-        tex2D.put(texCoord2D).position(0);
+        super(view);
     }
 
-    public void onResume() {
-        //nothing
-        Log.i(LOGTAG, "onResume");
-    }
-
-    public void onPause() {
-        Log.i(LOGTAG, "onPause");
-        mGLInit = false;
-        mUpdateST = false;
-
+    @Override
+    protected synchronized void closeCamera() {
+        Log.i(LOGTAG, "closeCamera");
         if(mCamera != null) {
             mCamera.stopPreview();
+            mPreviewStarted = false;
             mCamera.release();
             mCamera = null;
         }
-
-        if(mSTexture != null) {
-            mSTexture.release();
-            mSTexture = null;
-            deleteTex(texCamera);
-        }
     }
 
-    public void onSurfaceCreated(GL10 unused, EGLConfig config) {
-        GLES20.glClearColor(1.0f, 1.0f, 1.0f, 1.0f);
-
-        progOES = loadShader(vss, fssOES);
-        vPosOES = GLES20.glGetAttribLocation(progOES, "vPosition");
-        vTCOES  = GLES20.glGetAttribLocation(progOES, "vTexCoord");
-        GLES20.glEnableVertexAttribArray(vPosOES);
-        GLES20.glEnableVertexAttribArray(vTCOES);
-
-        prog2D  = loadShader(vss, fss2D);
-        vPos2D = GLES20.glGetAttribLocation(prog2D, "vPosition");
-        vTC2D  = GLES20.glGetAttribLocation(prog2D, "vTexCoord");
-        GLES20.glEnableVertexAttribArray(vPos2D);
-        GLES20.glEnableVertexAttribArray(vTC2D);
+    @Override
+    protected synchronized void openCamera(int id) {
+        Log.i(LOGTAG, "openCamera");
+        closeCamera();
+        if (id == CameraBridgeViewBase.CAMERA_ID_ANY) {
+            Log.d(LOGTAG, "Trying to open camera with old open()");
+            try {
+                mCamera = Camera.open();
+            }
+            catch (Exception e){
+                Log.e(LOGTAG, "Camera is not available (in use or does not exist): " + e.getLocalizedMessage());
+            }
 
-        initTexOES(texCamera);
-        mSTexture = new SurfaceTexture(texCamera[0]);
-        mSTexture.setOnFrameAvailableListener(this);
+            if(mCamera == null && Build.VERSION.SDK_INT >= Build.VERSION_CODES.GINGERBREAD) {
+                boolean connected = false;
+                for (int camIdx = 0; camIdx < Camera.getNumberOfCameras(); ++camIdx) {
+                    Log.d(LOGTAG, "Trying to open camera with new open(" + camIdx + ")");
+                    try {
+                        mCamera = Camera.open(camIdx);
+                        connected = true;
+                    } catch (RuntimeException e) {
+                        Log.e(LOGTAG, "Camera #" + camIdx + "failed to open: " + e.getLocalizedMessage());
+                    }
+                    if (connected) break;
+                }
+            }
+        } else {
+            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.GINGERBREAD) {
+                int localCameraIndex = mCameraIndex;
+                if (mCameraIndex == CameraBridgeViewBase.CAMERA_ID_BACK) {
+                    Log.i(LOGTAG, "Trying to open BACK camera");
+                    Camera.CameraInfo cameraInfo = new Camera.CameraInfo();
+                    for (int camIdx = 0; camIdx < Camera.getNumberOfCameras(); ++camIdx) {
+                        Camera.getCameraInfo( camIdx, cameraInfo );
+                        if (cameraInfo.facing == Camera.CameraInfo.CAMERA_FACING_BACK) {
+                            localCameraIndex = camIdx;
+                            break;
+                        }
+                    }
+                } else if (mCameraIndex == CameraBridgeViewBase.CAMERA_ID_FRONT) {
+                    Log.i(LOGTAG, "Trying to open FRONT camera");
+                    Camera.CameraInfo cameraInfo = new Camera.CameraInfo();
+                    for (int camIdx = 0; camIdx < Camera.getNumberOfCameras(); ++camIdx) {
+                        Camera.getCameraInfo( camIdx, cameraInfo );
+                        if (cameraInfo.facing == Camera.CameraInfo.CAMERA_FACING_FRONT) {
+                            localCameraIndex = camIdx;
+                            break;
+                        }
+                    }
+                }
+                if (localCameraIndex == CameraBridgeViewBase.CAMERA_ID_BACK) {
+                    Log.e(LOGTAG, "Back camera not found!");
+                } else if (localCameraIndex == CameraBridgeViewBase.CAMERA_ID_FRONT) {
+                    Log.e(LOGTAG, "Front camera not found!");
+                } else {
+                    Log.d(LOGTAG, "Trying to open camera with new open(" + localCameraIndex + ")");
+                    try {
+                        mCamera = Camera.open(localCameraIndex);
+                    } catch (RuntimeException e) {
+                        Log.e(LOGTAG, "Camera #" + localCameraIndex + "failed to open: " + e.getLocalizedMessage());
+                    }
+                }
+            }
+        }
+        if(mCamera == null) {
+            Log.e(LOGTAG, "Error: can't open camera");
+            return;
+        }
+        Camera.Parameters params = mCamera.getParameters();
+        List<String> FocusModes = params.getSupportedFocusModes();
+        if (FocusModes != null && FocusModes.contains(Camera.Parameters.FOCUS_MODE_CONTINUOUS_VIDEO))
+        {
+            params.setFocusMode(Camera.Parameters.FOCUS_MODE_CONTINUOUS_VIDEO);
+        }
+        mCamera.setParameters(params);
 
-        mCamera = Camera.open();
         try {
             mCamera.setPreviewTexture(mSTexture);
         } catch (IOException ioe) {
+            Log.e(LOGTAG, "setPreviewTexture() failed: " + ioe.getMessage());
         }
-
-        mGLInit = true;
     }
 
-    public void onDrawFrame(GL10 unused) {
-        if (!mGLInit)
+    @Override
+    public synchronized void setCameraPreviewSize(int width, int height) {
+        Log.i(LOGTAG, "setCameraPreviewSize: "+width+"x"+height);
+        if(mCamera == null) {
+            Log.e(LOGTAG, "Camera isn't initialized!");
             return;
-        GLES20.glClear(GLES20.GL_COLOR_BUFFER_BIT);
-
-        synchronized (this) {
-            if (mUpdateST) {
-                mSTexture.updateTexImage();
-                mUpdateST = false;
-            }
         }
 
-        CameraTextureListener texListener = mView.getCameraTextureListener();
-        if(texListener != null) {
-            Log.d(LOGTAG, "haveUserCallback");
-            // texCamera(OES) -> texFBO
-            drawTex(texCamera[0], true, FBO[0]);
-
-            // call user code (texFBO -> texDraw)
-            boolean modified = texListener.onCameraFrame(texFBO[0], texDraw[0], mPreviewWidth, mPreviewHeight);
-
-            if(modified) {
-                // texDraw -> screen
-                drawTex(texDraw[0], false, 0);
-            } else {
-                // texFBO -> screen
-                drawTex(texFBO[0], false, 0);
-            }
-        } else {
-            // texCamera(OES) -> screen
-            drawTex(texCamera[0], true, 0);
-        }
-    }
-
-    public void onSurfaceChanged(GL10 unused, int width, int height) {
-        Log.i(LOGTAG, "onSurfaceChanged("+width+"x"+height+")");
-
-        if(mCamera == null)
-            return;
-        if(mPreviewStarted) {
-            mCamera.stopPreview();
-            mPreviewStarted = false;
-        }
+        if(mMaxCameraWidth  > 0 && mMaxCameraWidth  < width)  width  = mMaxCameraWidth;
+        if(mMaxCameraHeight > 0 && mMaxCameraHeight < height) height = mMaxCameraHeight;
 
         Camera.Parameters param = mCamera.getParameters();
         List<Size> psize = param.getSupportedPreviewSizes();
@@ -207,147 +142,25 @@ public class CameraRenderer implements GLSurfaceView.Renderer,
                     bestHeight = h;
                 }
             }
-            if(bestWidth > 0 && bestHeight > 0) {
-                param.setPreviewSize(bestWidth, bestHeight);
-                Log.i(LOGTAG, "selected size: "+bestWidth+" x "+bestHeight);
+            if(bestWidth <= 0 || bestHeight <= 0) {
+                bestWidth  = psize.get(0).width;
+                bestHeight = psize.get(0).height;
+                Log.e(LOGTAG, "Error: best size was not selected, using "+bestWidth+" x "+bestHeight);
+            } else {
+                Log.i(LOGTAG, "Selected best size: "+bestWidth+" x "+bestHeight);
+            }
 
-                GLES20.glViewport(0, 0, bestWidth, bestWidth);
-                initFBO(bestWidth, bestHeight);
-                mPreviewWidth = bestWidth;
-                mPreviewHeight = bestHeight;
+            if(mPreviewStarted) {
+                mCamera.stopPreview();
+                mPreviewStarted = false;
             }
+            mCameraWidth  = bestWidth;
+            mCameraHeight = bestHeight;
+            param.setPreviewSize(bestWidth, bestHeight);
         }
-        //param.set("orientation", "landscape");
+        param.set("orientation", "landscape");
         mCamera.setParameters(param);
         mCamera.startPreview();
         mPreviewStarted = true;
     }
-
-    public synchronized void onFrameAvailable(SurfaceTexture st) {
-        mUpdateST = true;
-        mView.requestRender();
-    }
-
-    private void initTexOES(int[] tex) {
-        if(tex.length == 1) {
-            GLES20.glGenTextures(1, tex, 0);
-            GLES20.glBindTexture(GLES11Ext.GL_TEXTURE_EXTERNAL_OES, tex[0]);
-            GLES20.glTexParameteri(GLES11Ext.GL_TEXTURE_EXTERNAL_OES, GLES20.GL_TEXTURE_WRAP_S, GLES20.GL_CLAMP_TO_EDGE);
-            GLES20.glTexParameteri(GLES11Ext.GL_TEXTURE_EXTERNAL_OES, GLES20.GL_TEXTURE_WRAP_T, GLES20.GL_CLAMP_TO_EDGE);
-            GLES20.glTexParameteri(GLES11Ext.GL_TEXTURE_EXTERNAL_OES, GLES20.GL_TEXTURE_MIN_FILTER, GLES20.GL_NEAREST);
-            GLES20.glTexParameteri(GLES11Ext.GL_TEXTURE_EXTERNAL_OES, GLES20.GL_TEXTURE_MAG_FILTER, GLES20.GL_NEAREST);
-        }
-    }
-
-    private void deleteTex(int[] tex) {
-        if(tex.length == 1) {
-            GLES20.glDeleteTextures(1, tex, 0);
-        }
-    }
-
-    private static int loadShader(String vss, String fss) {
-        int vshader = GLES20.glCreateShader(GLES20.GL_VERTEX_SHADER);
-        GLES20.glShaderSource(vshader, vss);
-        GLES20.glCompileShader(vshader);
-        int[] compiled = new int[1];
-        GLES20.glGetShaderiv(vshader, GLES20.GL_COMPILE_STATUS, compiled, 0);
-        if (compiled[0] == 0) {
-            Log.e(LOGTAG, "Could not compile vertex shader");
-            Log.v(LOGTAG, "Could not compile vertex shader:"+GLES20.glGetShaderInfoLog(vshader));
-            GLES20.glDeleteShader(vshader);
-            vshader = 0;
-        }
-
-        int fshader = GLES20.glCreateShader(GLES20.GL_FRAGMENT_SHADER);
-        GLES20.glShaderSource(fshader, fss);
-        GLES20.glCompileShader(fshader);
-        GLES20.glGetShaderiv(fshader, GLES20.GL_COMPILE_STATUS, compiled, 0);
-        if (compiled[0] == 0) {
-            Log.e("Renderer", "Could not compile fragment shader");
-            Log.v("Renderer", "Could not compile fragment shader:"+GLES20.glGetShaderInfoLog(fshader));
-            GLES20.glDeleteShader(fshader);
-            fshader = 0;
-        }
-
-        int program = GLES20.glCreateProgram();
-        GLES20.glAttachShader(program, vshader);
-        GLES20.glAttachShader(program, fshader);
-        GLES20.glLinkProgram(program);
-
-        return program;
-    }
-
-    private void releaseFBO()
-    {
-
-        GLES20.glBindFramebuffer(GLES20.GL_FRAMEBUFFER, 0);
-        GLES20.glDeleteFramebuffers(1, FBO, 0);
-
-        deleteTex(texFBO);
-        deleteTex(texDraw);
-    }
-
-    private void initFBO(int width, int height)
-    {
-        Log.d(LOGTAG, "initFBO("+width+"x"+height+")");
-        releaseFBO();
-
-        GLES20.glGenTextures(1, texDraw, 0);
-        GLES20.glBindTexture(GLES20.GL_TEXTURE_2D, texDraw[0]);
-        GLES20.glTexImage2D(GLES20.GL_TEXTURE_2D, 0, GLES20.GL_RGBA, width, height, 0, GLES20.GL_RGBA, GLES20.GL_UNSIGNED_BYTE, null);
-        GLES20.glTexParameteri(GLES20.GL_TEXTURE_2D, GLES20.GL_TEXTURE_WRAP_S, GLES20.GL_CLAMP_TO_EDGE);
-        GLES20.glTexParameteri(GLES20.GL_TEXTURE_2D, GLES20.GL_TEXTURE_WRAP_T, GLES20.GL_CLAMP_TO_EDGE);
-        GLES20.glTexParameteri(GLES20.GL_TEXTURE_2D, GLES20.GL_TEXTURE_MIN_FILTER, GLES20.GL_NEAREST);
-        GLES20.glTexParameteri(GLES20.GL_TEXTURE_2D, GLES20.GL_TEXTURE_MAG_FILTER, GLES20.GL_NEAREST);
-
-        GLES20.glGenTextures(1, texFBO, 0);
-        GLES20.glBindTexture(GLES20.GL_TEXTURE_2D, texFBO[0]);
-        GLES20.glTexImage2D(GLES20.GL_TEXTURE_2D, 0, GLES20.GL_RGBA, width, height, 0, GLES20.GL_RGBA, GLES20.GL_UNSIGNED_BYTE, null);
-        GLES20.glTexParameteri(GLES20.GL_TEXTURE_2D, GLES20.GL_TEXTURE_WRAP_S, GLES20.GL_CLAMP_TO_EDGE);
-        GLES20.glTexParameteri(GLES20.GL_TEXTURE_2D, GLES20.GL_TEXTURE_WRAP_T, GLES20.GL_CLAMP_TO_EDGE);
-        GLES20.glTexParameteri(GLES20.GL_TEXTURE_2D, GLES20.GL_TEXTURE_MIN_FILTER, GLES20.GL_NEAREST);
-        GLES20.glTexParameteri(GLES20.GL_TEXTURE_2D, GLES20.GL_TEXTURE_MAG_FILTER, GLES20.GL_NEAREST);
-
-        //int hFBO;
-        GLES20.glGenFramebuffers(1, FBO, 0);
-        GLES20.glBindFramebuffer(GLES20.GL_FRAMEBUFFER, FBO[0]);
-        GLES20.glFramebufferTexture2D(GLES20.GL_FRAMEBUFFER, GLES20.GL_COLOR_ATTACHMENT0, GLES20.GL_TEXTURE_2D, texFBO[0], 0);
-        Log.d(LOGTAG, "initFBO status: " + GLES20.glGetError());
-
-        if (GLES20.glCheckFramebufferStatus(GLES20.GL_FRAMEBUFFER) != GLES20.GL_FRAMEBUFFER_COMPLETE)
-            Log.e(LOGTAG, "initFBO failed: " + GLES20.glCheckFramebufferStatus(GLES20.GL_FRAMEBUFFER));
-
-        //GLES20.glViewport(0, 0, width, height);
-    }
-
-    // draw texture to FBO or to screen if fbo == 0
-    private void drawTex(int tex, boolean isOES, int fbo)
-    {
-        GLES20.glBindFramebuffer(GLES20.GL_FRAMEBUFFER, fbo);
-        GLES20.glViewport(0, 0, mPreviewWidth, mPreviewHeight);
-        GLES20.glClear(GLES20.GL_COLOR_BUFFER_BIT);
-
-        if(isOES) {
-            GLES20.glUseProgram(progOES);
-            GLES20.glVertexAttribPointer(vPosOES, 2, GLES20.GL_FLOAT, false, 4*2, vert);
-            GLES20.glVertexAttribPointer(vTCOES,  2, GLES20.GL_FLOAT, false, 4*2, texOES);
-        } else {
-            GLES20.glUseProgram(prog2D);
-            GLES20.glVertexAttribPointer(vPos2D, 2, GLES20.GL_FLOAT, false, 4*2, vert);
-            GLES20.glVertexAttribPointer(vTC2D,  2, GLES20.GL_FLOAT, false, 4*2, tex2D);
-        }
-
-        GLES20.glActiveTexture(GLES20.GL_TEXTURE0);
-
-        if(isOES) {
-            GLES20.glBindTexture(GLES11Ext.GL_TEXTURE_EXTERNAL_OES, tex);
-            GLES20.glUniform1i(GLES20.glGetUniformLocation(progOES, "sTexture"), 0);
-        } else {
-            GLES20.glBindTexture(GLES20.GL_TEXTURE_2D, tex);
-            GLES20.glUniform1i(GLES20.glGetUniformLocation(prog2D, "sTexture"), 0);
-        }
-
-        GLES20.glDrawArrays(GLES20.GL_TRIANGLE_STRIP, 0, 4);
-        GLES20.glFlush();
-    }
 }
\ No newline at end of file