Use device orientation flag (#497)

* Add cameraUseDeviceOrientation flag

* Add tests for useDeviceOrientation

* Improve demo app

* Add docs

* Fix tests

cameraview/src/androidTest/java/com/otaliastudios/cameraview/CameraViewTest.java

@@ -164,6 +164,7 @@ public class CameraViewTest extends BaseTest {
         // Self managed
         GestureParser gestures = new GestureParser(empty);
         assertEquals(cameraView.getPlaySounds(), CameraView.DEFAULT_PLAY_SOUNDS);
+        assertEquals(cameraView.getUseDeviceOrientation(), CameraView.DEFAULT_USE_DEVICE_ORIENTATION);
         assertEquals(cameraView.getGestureAction(Gesture.TAP), gestures.getTapAction());
         assertEquals(cameraView.getGestureAction(Gesture.LONG_TAP), gestures.getLongTapAction());
         assertEquals(cameraView.getGestureAction(Gesture.PINCH), gestures.getPinchAction());
@@ -544,9 +545,17 @@ public class CameraViewTest extends BaseTest {
     @Test
     public void testSetPlaySounds() {
         cameraView.setPlaySounds(true);
-        assertEquals(cameraView.getPlaySounds(), true);
+        assertTrue(cameraView.getPlaySounds());
         cameraView.setPlaySounds(false);
-        assertEquals(cameraView.getPlaySounds(), false);
+        assertFalse(cameraView.getPlaySounds());
+    }
+
+    @Test
+    public void testSetUseDeviceOrientation() {
+        cameraView.setUseDeviceOrientation(true);
+        assertTrue(cameraView.getUseDeviceOrientation());
+        cameraView.setUseDeviceOrientation(false);
+        assertFalse(cameraView.getUseDeviceOrientation());
     }
 
     @Test

cameraview/src/androidTest/java/com/otaliastudios/cameraview/preview/MockCameraPreview.java

@@ -15,6 +15,8 @@ public class MockCameraPreview extends CameraPreview<View, Void> {
         super(context, parent);
     }
 
+    private View rootView;
+
     @Override
     public boolean supportsCropping() {
         return true;
@@ -23,7 +25,8 @@ public class MockCameraPreview extends CameraPreview<View, Void> {
     @NonNull
     @Override
     protected View onCreateView(@NonNull Context context, @NonNull ViewGroup parent) {
-        return new View(context);
+        rootView = new View(context);
+        return rootView;
     }
 
     @NonNull
@@ -42,6 +45,6 @@ public class MockCameraPreview extends CameraPreview<View, Void> {
     @NonNull
     @Override
     public View getRootView() {
-        return null;
+        return rootView;
     }
 }

cameraview/src/main/java/com/otaliastudios/cameraview/CameraOptions.java

@@ -20,6 +20,7 @@ import com.otaliastudios.cameraview.controls.Control;
 import com.otaliastudios.cameraview.controls.Engine;
 import com.otaliastudios.cameraview.controls.Facing;
 import com.otaliastudios.cameraview.controls.Flash;
+import com.otaliastudios.cameraview.controls.Preview;
 import com.otaliastudios.cameraview.engine.Mapper;
 import com.otaliastudios.cameraview.gesture.GestureAction;
 import com.otaliastudios.cameraview.controls.Grid;
@@ -309,6 +310,8 @@ public class CameraOptions {
             return (Collection<T>) getSupportedWhiteBalance();
         } else if (controlClass.equals(Engine.class)) {
             return (Collection<T>) Arrays.asList(Engine.values());
+        } else if (controlClass.equals(Preview.class)) {
+            return (Collection<T>) Arrays.asList(Preview.values());
         }
         // Unrecognized control.
         return Collections.emptyList();

cameraview/src/main/java/com/otaliastudios/cameraview/CameraView.java

@@ -6,6 +6,7 @@ import android.annotation.TargetApi;
 import android.app.Activity;
 
 import androidx.annotation.VisibleForTesting;
+import androidx.core.view.ViewCompat;
 import androidx.lifecycle.Lifecycle;
 import androidx.lifecycle.LifecycleObserver;
 import androidx.lifecycle.LifecycleOwner;
@@ -98,9 +99,11 @@ public class CameraView extends FrameLayout implements LifecycleObserver {
 
     final static long DEFAULT_AUTOFOCUS_RESET_DELAY_MILLIS = 3000;
     final static boolean DEFAULT_PLAY_SOUNDS = true;
+    final static boolean DEFAULT_USE_DEVICE_ORIENTATION = true;
 
     // Self managed parameters
     private boolean mPlaySounds;
+    private boolean mUseDeviceOrientation;
     private HashMap<Gesture, GestureAction> mGestureMap = new HashMap<>(4);
     private Preview mPreview;
     private Engine mEngine;
@@ -152,6 +155,7 @@ public class CameraView extends FrameLayout implements LifecycleObserver {
 
         // Self managed
         boolean playSounds = a.getBoolean(R.styleable.CameraView_cameraPlaySounds, DEFAULT_PLAY_SOUNDS);
+        boolean useDeviceOrientation = a.getBoolean(R.styleable.CameraView_cameraUseDeviceOrientation, DEFAULT_USE_DEVICE_ORIENTATION);
         mExperimental = a.getBoolean(R.styleable.CameraView_cameraExperimental, false);
         mPreview = controls.getPreview();
         mEngine = controls.getEngine();
@@ -192,6 +196,7 @@ public class CameraView extends FrameLayout implements LifecycleObserver {
 
         // Apply self managed
         setPlaySounds(playSounds);
+        setUseDeviceOrientation(useDeviceOrientation);
         setGrid(controls.getGrid());
         setGridColor(gridColor);
 
@@ -640,7 +645,7 @@ public class CameraView extends FrameLayout implements LifecycleObserver {
         if (checkPermissions(getAudio())) {
             // Update display orientation for current CameraEngine
             mOrientationHelper.enable(getContext());
-            mCameraEngine.setDisplayOffset(mOrientationHelper.getDisplayOffset());
+            mCameraEngine.getAngles().setDisplayOffset(mOrientationHelper.getDisplayOffset());
             mCameraEngine.start();
         }
     }
@@ -778,9 +783,26 @@ public class CameraView extends FrameLayout implements LifecycleObserver {
      * @param preview desired preview engine
      */
     public void setPreview(@NonNull Preview preview) {
+        boolean isNew = preview != mPreview;
+        if (!isNew) return;
         mPreview = preview;
+        if (!ViewCompat.isAttachedToWindow(this) && mCameraPreview != null) {
+            // Null the preview: will create another when re-attaching.
+            mCameraPreview.onDestroy();
+            mCameraPreview = null;
+        }
     }
 
+    /**
+     * Returns the current preview control.
+     *
+     * @see #setPreview(Preview)
+     * @return the current preview control
+     */
+    @NonNull
+    public Preview getPreview() {
+        return mPreview;
+    }
 
     /**
      * Controls the core engine. Should only be called
@@ -816,6 +838,16 @@ public class CameraView extends FrameLayout implements LifecycleObserver {
         setAutoFocusResetDelay(oldEngine.getAutoFocusResetDelay());
     }
 
+    /**
+     * Returns the current engine control.
+     *
+     * @see #setEngine(Engine)
+     * @return the current engine control
+     */
+    @NonNull
+    public Engine getEngine() {
+        return mEngine;
+    }
 
     /**
      * Returns a {@link CameraOptions} instance holding supported options for this camera
@@ -1648,6 +1680,27 @@ public class CameraView extends FrameLayout implements LifecycleObserver {
         return mPlaySounds;
     }
 
+    /**
+     * Controls whether picture and video output should consider the current device orientation.
+     * For example, when true, if the user rotates the device before taking a picture, the picture
+     * will be rotated as well.
+     *
+     * @param useDeviceOrientation true to consider device orientation for outputs
+     */
+    public void setUseDeviceOrientation(boolean useDeviceOrientation) {
+        mUseDeviceOrientation = useDeviceOrientation;
+    }
+
+    /**
+     * Gets the current behavior for considering the device orientation when returning picture
+     * or video outputs.
+     *
+     * @see #setUseDeviceOrientation(boolean)
+     * @return whether we are using the device orientation for outputs
+     */
+    public boolean getUseDeviceOrientation() {
+        return mUseDeviceOrientation;
+    }
 
     /**
      * Sets the encoder for video recordings.
@@ -1890,8 +1943,15 @@ public class CameraView extends FrameLayout implements LifecycleObserver {
         @Override
         public void onDeviceOrientationChanged(int deviceOrientation) {
             mLogger.i("onDeviceOrientationChanged", deviceOrientation);
-            mCameraEngine.setDeviceOrientation(deviceOrientation);
             int displayOffset = mOrientationHelper.getDisplayOffset();
+            if (!mUseDeviceOrientation) {
+                // To fool the engine to return outputs in the VIEW reference system,
+                // The device orientation should be set to -displayOffset.
+                int fakeDeviceOrientation = (360 - displayOffset) % 360;
+                mCameraEngine.getAngles().setDeviceOrientation(fakeDeviceOrientation);
+            } else {
+                mCameraEngine.getAngles().setDeviceOrientation(deviceOrientation);
+            }
             final int value = (deviceOrientation + displayOffset) % 360;
             mUiHandler.post(new Runnable() {
                 @Override

cameraview/src/main/java/com/otaliastudios/cameraview/engine/Camera1Engine.java

@@ -123,7 +123,7 @@ public class Camera1Engine extends CameraEngine implements
         for (int i = 0, count = Camera.getNumberOfCameras(); i < count; i++) {
             Camera.getCameraInfo(i, cameraInfo);
             if (cameraInfo.facing == internalFacing) {
-                setSensorOffset(facing, cameraInfo.orientation);
+                getAngles().setSensorOffset(facing, cameraInfo.orientation);
                 mCameraId = i;
                 return true;
             }
@@ -351,13 +351,11 @@ public class Camera1Engine extends CameraEngine implements
             throw new IllegalStateException("Video snapshots are only supported starting from API 18.");
         }
         GlCameraPreview glPreview = (GlCameraPreview) mPreview;
-
-        // Output size is easy:
         Size outputSize = getUncroppedSnapshotSize(Reference.OUTPUT);
         if (outputSize == null) {
             throw new IllegalStateException("outputSize should not be null.");
         }
-        AspectRatio outputRatio = getAngles().flip(Reference.OUTPUT, Reference.VIEW) ? viewAspectRatio.flip() : viewAspectRatio;
+        AspectRatio outputRatio = getAngles().flip(Reference.VIEW, Reference.OUTPUT) ? viewAspectRatio.flip() : viewAspectRatio;
         Rect outputCrop = CropHelper.computeCrop(outputSize, outputRatio);
         outputSize = new Size(outputCrop.width(), outputCrop.height());
         stub.size = outputSize;

cameraview/src/main/java/com/otaliastudios/cameraview/engine/Camera2Engine.java

@@ -19,7 +19,6 @@ import android.hardware.camera2.params.StreamConfigurationMap;
 import android.location.Location;
 import android.media.Image;
 import android.media.ImageReader;
-import android.media.MediaCodec;
 import android.os.Build;
 import android.util.Rational;
 import android.view.Surface;
@@ -96,8 +95,7 @@ public class Camera2Engine extends CameraEngine implements ImageReader.OnImageAv
     private Surface mPreviewStreamSurface;
 
     // Video recording
-    private Surface mFullVideoPersistentSurface; // API 23+. The surface is created before.
+    private VideoResult.Stub mFullVideoPendingStub; // When takeVideo is called, we have to reset the session.
-    private VideoResult.Stub mFullVideoPendingStub; // API 21-22. When takeVideo is called, we have to reset the session.
 
     // Picture capturing
     private ImageReader mPictureReader;
@@ -302,7 +300,7 @@ public class Camera2Engine extends CameraEngine implements ImageReader.OnImageAv
                 if (internalFacing == readCharacteristic(characteristics, CameraCharacteristics.LENS_FACING, -99)) {
                     mCameraId = cameraId;
                     int sensorOffset = readCharacteristic(characteristics, CameraCharacteristics.SENSOR_ORIENTATION, 0);
-                    setSensorOffset(facing, sensorOffset);
+                    getAngles().setSensorOffset(facing, sensorOffset);
                     return true;
                 }
             } catch (CameraAccessException ignore) {
@@ -411,11 +409,8 @@ public class Camera2Engine extends CameraEngine implements ImageReader.OnImageAv
 
         // 2. VIDEO RECORDING
         if (getMode() == Mode.VIDEO) {
-            if (Full2VideoRecorder.SUPPORTS_PERSISTENT_SURFACE) {
+            if (mFullVideoPendingStub != null) {
-                mFullVideoPersistentSurface = MediaCodec.createPersistentInputSurface();
+                Full2VideoRecorder recorder = new Full2VideoRecorder(this, mCameraId);
-                outputSurfaces.add(mFullVideoPersistentSurface);
-            } else if (mFullVideoPendingStub != null) {
-                Full2VideoRecorder recorder = new Full2VideoRecorder(this, mCameraId, null);
                 try {
                     outputSurfaces.add(recorder.createInputSurface(mFullVideoPendingStub));
                 } catch (Full2VideoRecorder.PrepareException e) {
@@ -567,10 +562,6 @@ public class Camera2Engine extends CameraEngine implements ImageReader.OnImageAv
     @Override
     protected Task<Void> onStopBind() {
         LOG.i("onStopBind:", "About to clean up.");
-        if (mFullVideoPersistentSurface != null) {
-            mFullVideoPersistentSurface.release();
-            mFullVideoPersistentSurface = null;
-        }
         mFrameProcessingSurface = null;
         mPreviewStreamSurface = null;
         mPreviewStreamSize = null;
@@ -667,19 +658,17 @@ public class Camera2Engine extends CameraEngine implements ImageReader.OnImageAv
         LOG.i("onTakeVideo", "called.");
         stub.rotation = getAngles().offset(Reference.SENSOR, Reference.OUTPUT, Axis.RELATIVE_TO_SENSOR);
         stub.size = getAngles().flip(Reference.SENSOR, Reference.OUTPUT) ? mCaptureSize.flip() : mCaptureSize;
-        if (!Full2VideoRecorder.SUPPORTS_PERSISTENT_SURFACE) {
+        // We must restart the session at each time.
-            // On API 21 and 22, we must restart the session at each time.
         // Save the pending data and restart the session.
         LOG.w("onTakeVideo", "calling restartBind.");
         mFullVideoPendingStub = stub;
         restartBind();
-        } else {
-            doTakeVideo(stub);
-        }
     }
 
     private void doTakeVideo(@NonNull final VideoResult.Stub stub) {
-        mVideoRecorder = new Full2VideoRecorder(this, mCameraId, mFullVideoPersistentSurface);
+        if (!(mVideoRecorder instanceof Full2VideoRecorder)) {
+            mVideoRecorder = new Full2VideoRecorder(this, mCameraId);
+        }
         Full2VideoRecorder recorder = (Full2VideoRecorder) mVideoRecorder;
         try {
             createRepeatingRequestBuilder(CameraDevice.TEMPLATE_RECORD);
@@ -706,13 +695,11 @@ public class Camera2Engine extends CameraEngine implements ImageReader.OnImageAv
             throw new IllegalStateException("Video snapshots are only supported with GlCameraPreview.");
         }
         GlCameraPreview glPreview = (GlCameraPreview) mPreview;
-
-        // Output size is easy:
         Size outputSize = getUncroppedSnapshotSize(Reference.OUTPUT);
         if (outputSize == null) {
             throw new IllegalStateException("outputSize should not be null.");
         }
-        AspectRatio outputRatio = getAngles().flip(Reference.OUTPUT, Reference.VIEW) ? viewAspectRatio.flip() : viewAspectRatio;
+        AspectRatio outputRatio = getAngles().flip(Reference.VIEW, Reference.OUTPUT) ? viewAspectRatio.flip() : viewAspectRatio;
         Rect outputCrop = CropHelper.computeCrop(outputSize, outputRatio);
         outputSize = new Size(outputCrop.width(), outputCrop.height());
         stub.size = outputSize;

cameraview/src/main/java/com/otaliastudios/cameraview/engine/CameraEngine.java

@@ -70,7 +70,7 @@ import java.util.concurrent.TimeUnit;
  * So at the end of both step 1 and 2, the engine should check if both have
  * been performed and trigger the steps 3 and 4.
  *
- * We use an abstraction for each step called {@link CameraEngineStep} that manages the state of
+ * We use an abstraction for each step called {@link Step} that manages the state of
  * each step and ensures that start and stop operations, for each step, are never called if the
  * previous one has not ended.
  *
@@ -140,11 +140,11 @@ public abstract class CameraEngine implements
     private static final CameraLogger LOG = CameraLogger.create(TAG);
 
     @SuppressWarnings({"WeakerAccess", "unused"})
-    public static final int STATE_STOPPING = CameraEngineStep.STATE_STOPPING;
+    public static final int STATE_STOPPING = Step.STATE_STOPPING;
-    public static final int STATE_STOPPED = CameraEngineStep.STATE_STOPPED;
+    public static final int STATE_STOPPED = Step.STATE_STOPPED;
     @SuppressWarnings({"WeakerAccess", "unused"})
-    public static final int STATE_STARTING = CameraEngineStep.STATE_STARTING;
+    public static final int STATE_STARTING = Step.STATE_STARTING;
-    public static final int STATE_STARTED = CameraEngineStep.STATE_STARTED;
+    public static final int STATE_STARTED = Step.STATE_STARTED;
 
     // Need to be protected
     @SuppressWarnings("WeakerAccess") protected WorkerHandler mHandler;
@@ -185,16 +185,17 @@ public abstract class CameraEngine implements
     private int mSnapshotMaxHeight = Integer.MAX_VALUE; // in REF_VIEW for consistency with SizeSelectors
 
     // Steps
-    private final CameraEngineStep.Callback mStepCallback = new CameraEngineStep.Callback() {
+    private final Step.Callback mStepCallback = new Step.Callback() {
         @Override @NonNull public Executor getExecutor() { return mHandler.getExecutor(); }
         @Override public void handleException(@NonNull Exception exception) {
             CameraEngine.this.handleException(Thread.currentThread(), exception, false);
         }
     };
-    @VisibleForTesting CameraEngineStep mEngineStep = new CameraEngineStep("engine", mStepCallback);
+    @VisibleForTesting
-    private CameraEngineStep mBindStep = new CameraEngineStep("bind", mStepCallback);
+    Step mEngineStep = new Step("engine", mStepCallback);
-    private CameraEngineStep mPreviewStep = new CameraEngineStep("preview", mStepCallback);
+    private Step mBindStep = new Step("bind", mStepCallback);
-    private CameraEngineStep mAllStep = new CameraEngineStep("all", mStepCallback);
+    private Step mPreviewStep = new Step("preview", mStepCallback);
+    private Step mAllStep = new Step("all", mStepCallback);
 
     // Ops used for testing.
     @VisibleForTesting Op<Void> mStartVideoOp = new Op<>();
@@ -785,21 +786,6 @@ public abstract class CameraEngine implements
         return mAngles;
     }
 
-    @SuppressWarnings("WeakerAccess")
-    protected final void setSensorOffset(@NonNull Facing facing, int sensorOffset) {
-        mAngles.setSensorOffset(facing, sensorOffset);
-    }
-
-    // This is called before start() and never again.
-    public final void setDisplayOffset(int displayOffset) {
-        mAngles.setDisplayOffset(displayOffset);
-    }
-
-    // This can be called multiple times.
-    public final void setDeviceOrientation(int deviceOrientation) {
-        mAngles.setDeviceOrientation(deviceOrientation);
-    }
-
     public final void setPreviewStreamSizeSelector(@Nullable SizeSelector selector) {
         mPreviewStreamSizeSelector = selector;
     }
@@ -1018,7 +1004,7 @@ public abstract class CameraEngine implements
      * Camera is about to be opened. Implementors should look into available cameras
      * and see if anyone matches the given {@link Facing value}.
      *
-     * If so, implementors should set {@link #setSensorOffset(Facing, int)} and any other information
+     * If so, implementors should set {@link Angles#setSensorOffset(Facing, int)} and any other information
      * (like camera ID) needed to start the engine.
      *
      * @param facing the facing value

cameraview/src/main/java/com/otaliastudios/cameraview/engine/Step.java

@@ -34,9 +34,9 @@ import androidx.annotation.VisibleForTesting;
  *
  * <strong>This class is NOT thread safe!</string>
  */
-class CameraEngineStep {
+class Step {
 
-    private static final String TAG = CameraEngineStep.class.getSimpleName();
+    private static final String TAG = Step.class.getSimpleName();
     private static final CameraLogger LOG = CameraLogger.create(TAG);
 
     interface Callback {
@@ -59,7 +59,7 @@ class CameraEngineStep {
     private final String name;
     private final Callback callback;
 
-    CameraEngineStep(@NonNull String name, @NonNull Callback callback) {
+    Step(@NonNull String name, @NonNull Callback callback) {
         this.name = name.toUpperCase();
         this.callback = callback;
     }

cameraview/src/main/java/com/otaliastudios/cameraview/picture/SnapshotGlPictureRecorder.java

@@ -114,7 +114,7 @@ public class SnapshotGlPictureRecorder extends PictureRecorder {
                         Matrix.scaleM(mTransform, 0, realScaleX, realScaleY, 1);
 
                         // Fix rotation:
-                        // TODO Not sure why we need the minus here... It makes no sense to me.
+                        // Not sure why we need the minus here... It makes no sense to me.
                         LOG.w("Recording frame. Rotation:", mResult.rotation, "Actual:", -mResult.rotation);
                         int rotation = -mResult.rotation;
                         mResult.rotation = 0;

cameraview/src/main/java/com/otaliastudios/cameraview/preview/CameraPreview.java

@@ -7,6 +7,7 @@ import androidx.annotation.VisibleForTesting;
 
 import android.view.View;
 import android.view.ViewGroup;
+import android.view.ViewParent;
 
 import com.otaliastudios.cameraview.CameraLogger;
 import com.otaliastudios.cameraview.engine.CameraEngine;
@@ -186,8 +187,10 @@ public abstract class CameraPreview<T extends View, Output> {
         if (mOutputSurfaceWidth > 0 && mOutputSurfaceHeight > 0) {
             crop(mCropOp);
         }
+        if (mSurfaceCallback != null) {
             mSurfaceCallback.onSurfaceAvailable();
         }
+    }
 
     /**
      * Subclasses can call this to notify that the surface has changed.
@@ -203,9 +206,11 @@ public abstract class CameraPreview<T extends View, Output> {
             if (width > 0 && height > 0) {
                 crop(mCropOp);
             }
+            if (mSurfaceCallback != null) {
                 mSurfaceCallback.onSurfaceChanged();
             }
         }
+    }
 
     /**
      * Subclasses can call this to notify that the surface has been destroyed.
@@ -214,8 +219,10 @@ public abstract class CameraPreview<T extends View, Output> {
     protected final void dispatchOnSurfaceDestroyed() {
         mOutputSurfaceWidth = 0;
         mOutputSurfaceHeight = 0;
+        if (mSurfaceCallback != null) {
             mSurfaceCallback.onSurfaceDestroyed();
         }
+    }
 
     /**
      * Called by the hosting {@link com.otaliastudios.cameraview.CameraView},
@@ -233,7 +240,13 @@ public abstract class CameraPreview<T extends View, Output> {
      * Called by the hosting {@link com.otaliastudios.cameraview.CameraView},
      * this is a lifecycle event.
      */
-    public void onDestroy() {}
+    public void onDestroy() {
+        View root = getRootView();
+        ViewParent parent = root.getParent();
+        if (parent instanceof ViewGroup) {
+            ((ViewGroup) parent).removeView(root);
+        }
+    }
 
     /**
      * Here we must crop the visible part by applying a scale greater than 1 to one of our

cameraview/src/main/java/com/otaliastudios/cameraview/video/Full2VideoRecorder.java

@@ -1,14 +1,6 @@
 package com.otaliastudios.cameraview.video;
 
 import android.annotation.SuppressLint;
-import android.graphics.SurfaceTexture;
-import android.hardware.camera2.CameraAccessException;
-import android.hardware.camera2.CameraCaptureSession;
-import android.hardware.camera2.CameraDevice;
-import android.hardware.camera2.CaptureFailure;
-import android.hardware.camera2.CaptureRequest;
-import android.media.Image;
-import android.media.MediaActionSound;
 import android.media.MediaRecorder;
 import android.os.Build;
 import android.view.Surface;
@@ -33,21 +25,13 @@ public class Full2VideoRecorder extends FullVideoRecorder {
     private static final String TAG = Full2VideoRecorder.class.getSimpleName();
     private static final CameraLogger LOG = CameraLogger.create(TAG);
 
-    // This actually didn't work as I expected, we're never using this. Should remove.
-    @SuppressWarnings("PointlessBooleanExpression") // TODO
-    public static final boolean SUPPORTS_PERSISTENT_SURFACE = false && Build.VERSION.SDK_INT >= 23;
-
     private final String mCameraId;
     private Surface mInputSurface;
-    private final boolean mUseInputSurface;
 
     public Full2VideoRecorder(@NonNull Camera2Engine engine,
-                              @NonNull String cameraId,
+                              @NonNull String cameraId) {
-                              @Nullable Surface surface) {
         super(engine);
         mCameraId = cameraId;
-        mUseInputSurface = surface != null && SUPPORTS_PERSISTENT_SURFACE;
-        mInputSurface = mUseInputSurface ? surface : null;
     }
 
     @SuppressLint("NewApi")
@@ -56,10 +40,10 @@ public class Full2VideoRecorder extends FullVideoRecorder {
         mediaRecorder.setVideoSource(MediaRecorder.VideoSource.SURFACE);
         Size size = stub.rotation % 180 != 0 ? stub.size.flip() : stub.size;
         mProfile = CamcorderProfiles.get(mCameraId, size);
-        if (mUseInputSurface) {
+        // This was an option: get the surface from outside this class, using MediaCodec.createPersistentInputSurface()
-            //noinspection ConstantConditions
+        // But it doesn't really help since the Camera2 engine refuses a surface that has not been configured,
-            mediaRecorder.setInputSurface(mInputSurface);
+        // so even with that trick we would have to attach the surface to this recorder before creating the CameraSession.
-        }
+        // mediaRecorder.setInputSurface(mInputSurface);
         return super.onPrepareMediaRecorder(stub, mediaRecorder);
     }
 
@@ -72,9 +56,6 @@ public class Full2VideoRecorder extends FullVideoRecorder {
      */
     @NonNull
     public Surface createInputSurface(@NonNull VideoResult.Stub stub) throws PrepareException {
-        if (mUseInputSurface) {
-            throw new IllegalStateException("We are using the input surface (API23+), can't createInputSurface here.");
-        }
         if (!prepareMediaRecorder(stub)) {
             throw new PrepareException(mError);
         }
@@ -87,8 +68,6 @@ public class Full2VideoRecorder extends FullVideoRecorder {
         return mInputSurface;
     }
 
-
-    @SuppressWarnings("WeakerAccess")
     public class PrepareException extends Exception {
         private PrepareException(Throwable cause) {
             super(cause);

cameraview/src/main/res/values/attrs.xml

@@ -131,5 +131,7 @@
 
         <attr name="cameraAutoFocusMarker" format="string|reference"/>
 
+        <attr name="cameraUseDeviceOrientation" format="boolean"/>
+
     </declare-styleable>
 </resources>

demo/src/main/java/com/otaliastudios/cameraview/demo/CameraActivity.java

@@ -21,6 +21,7 @@ import com.otaliastudios.cameraview.CameraView;
 import com.otaliastudios.cameraview.PictureResult;
 import com.otaliastudios.cameraview.controls.Mode;
 import com.otaliastudios.cameraview.VideoResult;
+import com.otaliastudios.cameraview.controls.Preview;
 import com.otaliastudios.cameraview.frame.Frame;
 import com.otaliastudios.cameraview.frame.FrameProcessor;
 import com.otaliastudios.cameraview.size.SizeSelectors;
@@ -173,6 +174,10 @@ public class CameraActivity extends AppCompatActivity implements View.OnClickLis
 
     private void capturePictureSnapshot() {
         if (camera.isTakingPicture()) return;
+        if (camera.getPreview() != Preview.GL_SURFACE) {
+            message("Picture snapshots are only allowed with the GL_SURFACE preview.", true);
+            return;
+        }
         mCaptureTime = System.currentTimeMillis();
         message("Capturing picture snapshot...", false);
         camera.takePictureSnapshot();
@@ -193,6 +198,10 @@ public class CameraActivity extends AppCompatActivity implements View.OnClickLis
             message("Already taking video.", false);
             return;
         }
+        if (camera.getPreview() != Preview.GL_SURFACE) {
+            message("Video snapshots are only allowed with the GL_SURFACE preview.", true);
+            return;
+        }
         message("Recording snapshot for 5 seconds...", true);
         camera.takeVideoSnapshot(new File(getFilesDir(), "video.mp4"), 5000);
     }
@@ -212,10 +221,11 @@ public class CameraActivity extends AppCompatActivity implements View.OnClickLis
 
     @Override
     public boolean onValueChanged(Control control, Object value, String name) {
-        if (!camera.isHardwareAccelerated() && (control == Control.WIDTH || control == Control.HEIGHT)) {
+        if ((control == Control.WIDTH || control == Control.HEIGHT)) {
-            if ((Integer) value > 0) {
+            Preview preview = camera.getPreview();
-                message("This device does not support hardware acceleration. " +
+            boolean wrapContent = (Integer) value == ViewGroup.LayoutParams.WRAP_CONTENT;
-                        "In this case you can not change width or height. " +
+            if (preview == Preview.SURFACE && !wrapContent) {
+                message("The SurfaceView preview does not support width or height changes. " +
                         "The view will act as WRAP_CONTENT by default.", true);
                 return false;
             }

demo/src/main/java/com/otaliastudios/cameraview/demo/Control.java

@@ -5,10 +5,13 @@ import androidx.annotation.NonNull;
 import android.view.View;
 import android.view.ViewGroup;
 
+import com.otaliastudios.cameraview.CameraListener;
 import com.otaliastudios.cameraview.controls.Audio;
 import com.otaliastudios.cameraview.CameraOptions;
 import com.otaliastudios.cameraview.CameraView;
+import com.otaliastudios.cameraview.controls.Engine;
 import com.otaliastudios.cameraview.controls.Flash;
+import com.otaliastudios.cameraview.controls.Preview;
 import com.otaliastudios.cameraview.gesture.Gesture;
 import com.otaliastudios.cameraview.gesture.GestureAction;
 import com.otaliastudios.cameraview.controls.Grid;
@@ -18,6 +21,7 @@ import com.otaliastudios.cameraview.controls.VideoCodec;
 import com.otaliastudios.cameraview.controls.WhiteBalance;
 
 import java.util.ArrayList;
+import java.util.Arrays;
 import java.util.Collection;
 import java.util.List;
 
@@ -26,28 +30,38 @@ import java.util.List;
  */
 public enum Control {
 
+    // Layout
     WIDTH("Width", false),
     HEIGHT("Height", true),
 
+    // Some controls
     MODE("Mode", false),
     FLASH("Flash", false),
     WHITE_BALANCE("White balance", false),
     HDR("Hdr", true),
 
-    GRID("Grid lines", false),
+    // Engine and preview
-    GRID_COLOR("Grid color", true),
+    ENGINE("Engine", false),
+    PREVIEW("Preview Surface", true),
 
-    // TODO audio bitRate
+    // Video recording
-    // TODO video bitRate
-    // THey are a bit annoying because it's not clear what the default should be.
     VIDEO_CODEC("Video codec", false),
     AUDIO("Audio", true),
+    // TODO audio bitRate
+    // TODO video bitRate
+    // They are a bit annoying because it's not clear what the default should be.
 
+    // Gestures
     PINCH("Pinch", false),
     HSCROLL("Horizontal scroll", false),
     VSCROLL("Vertical scroll", false),
     TAP("Single tap", false),
-    LONG_TAP("Long tap", true);
+    LONG_TAP("Long tap", true),
+
+    // Others
+    GRID("Grid lines", false),
+    GRID_COLOR("Grid color", false),
+    USE_DEVICE_ORIENTATION("Use device orientation", true);
 
     private String name;
     private boolean last;
@@ -88,6 +102,8 @@ public enum Control {
             case GRID: return options.getSupportedControls(Grid.class);
             case AUDIO: return options.getSupportedControls(Audio.class);
             case VIDEO_CODEC: return options.getSupportedControls(VideoCodec.class);
+            case ENGINE: return options.getSupportedControls(Engine.class);
+            case PREVIEW: return options.getSupportedControls(Preview.class);
             case PINCH:
             case HSCROLL:
             case VSCROLL:
@@ -110,6 +126,8 @@ public enum Control {
                 list3.add(new GridColor(Color.BLACK, "black"));
                 list3.add(new GridColor(Color.YELLOW, "yellow"));
                 return list3;
+            case USE_DEVICE_ORIENTATION:
+                return Arrays.asList(true, false);
         }
         return null;
     }
@@ -135,11 +153,14 @@ public enum Control {
             case VSCROLL: return view.getGestureAction(Gesture.SCROLL_VERTICAL);
             case TAP: return view.getGestureAction(Gesture.TAP);
             case LONG_TAP: return view.getGestureAction(Gesture.LONG_TAP);
+            case USE_DEVICE_ORIENTATION: return view.getUseDeviceOrientation();
+            case ENGINE: return view.getEngine();
+            case PREVIEW: return view.getPreview();
         }
         return null;
     }
 
-    public void applyValue(CameraView camera, Object value) {
+    public void applyValue(final CameraView camera, final Object value) {
         switch (this) {
             case WIDTH:
                 camera.getLayoutParams().width = (int) value;
@@ -175,9 +196,61 @@ public enum Control {
                 break;
             case GRID_COLOR:
                 camera.setGridColor(((GridColor) value).color);
+                break;
+            case USE_DEVICE_ORIENTATION:
+                camera.setUseDeviceOrientation((Boolean) value);
+                break;
+            case ENGINE:
+                boolean started = camera.isOpened();
+                if (started) {
+                    camera.addCameraListener(new CameraListener() {
+                        @Override
+                        public void onCameraClosed() {
+                            super.onCameraClosed();
+                            camera.removeCameraListener(this);
+                            camera.setEngine((Engine) value);
+                            camera.open();
+                        }
+                    });
+                    camera.close();
+                } else {
+                    camera.setEngine((Engine) value);
+                }
+                break;
+            case PREVIEW:
+                boolean opened = camera.isOpened();
+                if (opened) {
+                    camera.addCameraListener(new CameraListener() {
+                        @Override
+                        public void onCameraClosed() {
+                            super.onCameraClosed();
+                            camera.removeCameraListener(this);
+                            applyPreview(camera, (Preview) value, true);
+                        }
+                    });
+                    camera.close();
+                } else {
+                    applyPreview(camera, (Preview) value, false);
+                }
         }
     }
 
+    // This is really tricky since the preview can only be changed when not attached to window.
+    private void applyPreview(@NonNull CameraView cameraView, @NonNull Preview newPreview, boolean openWhenDone) {
+        ViewGroup.LayoutParams params = cameraView.getLayoutParams();
+        ViewGroup parent = (ViewGroup) cameraView.getParent();
+        int index = 0;
+        for (int i = 0; i < parent.getChildCount(); i++) {
+            if (parent.getChildAt(i) == cameraView) {
+                index = i;
+                break;
+            }
+        }
+        parent.removeView(cameraView);
+        cameraView.setPreview(newPreview);
+        parent.addView(cameraView, index, params);
+        if (openWhenDone) cameraView.open();
+    }
 
     static class GridColor {
         int color;

docs/_posts/2018-12-20-changelog.md

@@ -8,6 +8,10 @@ order: 3
 
 New versions are released through GitHub, so the reference page is the [GitHub Releases](https://github.com/natario1/CameraView/releases) page.
 
+### v2.0.0-*** (to be released)
+
+- New: `cameraUseDeviceOrientation` XML attribute and `setUseDeviceOrientation()` method to disable considering the device orientation for outputs. ([#497][497])
+
 ### v2.0.0-beta06
 
 - New: Full featured Camera2 integration! Use `cameraExperimental="true"` and `cameraEngine="camera2"` to test this out. ([#490][490])
@@ -65,3 +69,4 @@ This is the first beta release. For changes with respect to v1, please take a lo
 [482]: https://github.com/natario1/CameraView/pull/482
 [484]: https://github.com/natario1/CameraView/pull/484
 [490]: https://github.com/natario1/CameraView/pull/490
+[497]: https://github.com/natario1/CameraView/pull/497

docs/_posts/2018-12-20-more-features.md

@@ -16,7 +16,8 @@ disqus: 1
     app:cameraPlaySounds="true|false"
     app:cameraGrid="off|draw3x3|draw4x4|drawPhi"
     app:cameraGridColor="@color/black"
-    app:cameraAutoFocusResetDelay="0"/>
+    app:cameraAutoFocusResetDelay="0"
+    app:cameraUseDeviceOrientation="true"/>
 ```
 
 ##### cameraPlaySounds
@@ -89,6 +90,18 @@ cameraView.setCameraAutoFocusResetDelay(-1);  // NO reset
 cameraView.setCameraAutoFocusResetDelay(Long.MAX_VALUE);  // NO reset
 ```
 
+##### cameraUseDeviceOrientation
+
+Controls whether we should consider the device orientation for picture and video outputs.
+This defaults to true, but can be set to false for specific usages, where you don't want the
+output to be rotated based on the device rotation at the moment of capturing.
+Defaults to true.
+
+```java
+cameraView.setUseDeviceOrientation(true); // rotate media 
+cameraView.setUseDeviceOrientation(false); // don't
+```
+
 ### UI Orientation
 
 Within a Camera app, it's common to rotate buttons and other UI elements as the device is tilted around.

docs/_posts/2018-12-20-previews.md

@@ -64,4 +64,6 @@ The engine method should only be called when the `CameraView` is closed. Otherwi
 |Method|Description|
 |------|-----------|
 |`setPreview(Preview)`|Sets the preview implementation.|
+|`getPreview()`|Gets the current preview implementation.|
 |`setEngine(Engine)`|Sets the engine implementation.|
+|`getEngine()`|Gets the current engine implementation.|