Metering improvements (#741)

* Increase metering timeout for touch metering

* Improve DeviceEncoders to respect max block count

* Reorder block

* Update emulator to 29.3.4

* Update emulator to 29.3.4 (2)

* Improve exposure metering for legacy sensors

.github/workflows/build.yml

@@ -72,7 +72,7 @@ jobs:
           disable-animations: true
           profile: Nexus 5X
           emulator-options: -no-snapshot -no-window -no-boot-anim -camera-back emulated -camera-front emulated -gpu swiftshader_indirect
-          emulator-build: 6031357
+          emulator-build: 6110076
           script: ./.github/workflows/emulator_script.sh
       - name: Upload emulator tests artifact
         uses: actions/upload-artifact@v1

cameraview/build.gradle

@@ -145,7 +145,7 @@ bintray {
 
 // From official sample https://github.com/bintray/bintray-examples/blob/master/gradle-aar-example/build.gradle
 task sourcesJar(type: Jar) {
-    classifier = 'sources'
+    archiveClassifier.set('sources')
     from android.sourceSets.main.java.sourceFiles
 }
 
@@ -167,7 +167,7 @@ task javadoc(type: Javadoc) {
 }
 
 task javadocJar(type: Jar, dependsOn: javadoc) {
-    classifier = 'javadoc'
+    archiveClassifier.set('javadoc')
     from javadoc.destinationDir
 }
 

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

@@ -83,7 +83,8 @@ public class Camera2Engine extends CameraBaseEngine implements
         ActionHolder {
 
     private static final int FRAME_PROCESSING_FORMAT = ImageFormat.YUV_420_888;
-    @VisibleForTesting static final long METER_TIMEOUT = 2500;
+    @VisibleForTesting static final long METER_TIMEOUT = 5000;
+    private static final long METER_TIMEOUT_SHORT = 2500;
 
     private final CameraManager mManager;
     private String mCameraId;
@@ -770,7 +771,7 @@ public class Camera2Engine extends CameraBaseEngine implements
                                          boolean doMetering) {
         if (doMetering) {
             LOG.i("onTakePictureSnapshot:", "doMetering is true. Delaying.");
-            Action action = Actions.timeout(METER_TIMEOUT, createMeterAction(null));
+            Action action = Actions.timeout(METER_TIMEOUT_SHORT, createMeterAction(null));
             action.addCallback(new CompletionCallback() {
                 @Override
                 protected void onActionCompleted(@NonNull Action action) {
@@ -803,7 +804,7 @@ public class Camera2Engine extends CameraBaseEngine implements
     protected void onTakePicture(@NonNull final PictureResult.Stub stub, boolean doMetering) {
         if (doMetering) {
             LOG.i("onTakePicture:", "doMetering is true. Delaying.");
-            Action action = Actions.timeout(METER_TIMEOUT, createMeterAction(null));
+            Action action = Actions.timeout(METER_TIMEOUT_SHORT, createMeterAction(null));
             action.addCallback(new CompletionCallback() {
                 @Override
                 protected void onActionCompleted(@NonNull Action action) {

cameraview/src/main/java/com/otaliastudios/cameraview/engine/meter/ExposureMeter.java

@@ -24,6 +24,9 @@ public class ExposureMeter extends BaseMeter {
     private static final int STATE_WAITING_PRECAPTURE = 0;
     private static final int STATE_WAITING_PRECAPTURE_END = 1;
 
+    private boolean mSupportsAreas = false;
+    private boolean mSupportsTrigger = false;
+
     @SuppressWarnings("WeakerAccess")
     public ExposureMeter(@NonNull List<MeteringRectangle> areas, boolean skipIfPossible) {
         super(areas, skipIfPossible);
@@ -32,9 +35,9 @@ public class ExposureMeter extends BaseMeter {
     @Override
     protected boolean checkIsSupported(@NonNull ActionHolder holder) {
         // In our case, this means checking if we support the AE precapture trigger.
-        boolean isNotLegacy = readCharacteristic(
+        boolean isLegacy = readCharacteristic(
                 CameraCharacteristics.INFO_SUPPORTED_HARDWARE_LEVEL, -1)
-                != CameraCharacteristics.INFO_SUPPORTED_HARDWARE_LEVEL_LEGACY;
+                == CameraCharacteristics.INFO_SUPPORTED_HARDWARE_LEVEL_LEGACY;
         Integer aeMode = holder.getBuilder(this).get(CaptureRequest.CONTROL_AE_MODE);
         boolean isAEOn = aeMode != null &&
                 (aeMode == CameraCharacteristics.CONTROL_AE_MODE_ON
@@ -43,8 +46,13 @@ public class ExposureMeter extends BaseMeter {
                         || aeMode == CameraCharacteristics.CONTROL_AE_MODE_ON_AUTO_FLASH_REDEYE
                         || aeMode == 5
                         /* CameraCharacteristics.CONTROL_AE_MODE_ON_EXTERNAL_FLASH, API 28 */);
-        boolean result = isNotLegacy && isAEOn;
-        LOG.i("checkIsSupported:", result);
+        mSupportsTrigger = !isLegacy;
+        mSupportsAreas = readCharacteristic(CameraCharacteristics.CONTROL_MAX_REGIONS_AE,
+                0) > 0;
+        boolean result = isAEOn && (mSupportsTrigger || mSupportsAreas);
+        LOG.i("checkIsSupported:", result,
+                "trigger:", mSupportsTrigger,
+                "areas:", mSupportsAreas);
         return result;
     }
 
@@ -66,22 +74,26 @@ public class ExposureMeter extends BaseMeter {
     protected void onStarted(@NonNull ActionHolder holder, @NonNull List<MeteringRectangle> areas) {
         LOG.i("onStarted:", "with areas:", areas);
 
-        // Launch the precapture trigger.
-        holder.getBuilder(this).set(CaptureRequest.CONTROL_AE_PRECAPTURE_TRIGGER,
-                CaptureRequest.CONTROL_AE_PRECAPTURE_TRIGGER_START);
-
-        // Check the regions.
-        int maxRegions = readCharacteristic(CameraCharacteristics.CONTROL_MAX_REGIONS_AE,
-                0);
-        if (!areas.isEmpty() && maxRegions > 0) {
-            int max = Math.min(maxRegions, areas.size());
+        if (mSupportsAreas && !areas.isEmpty()) {
+            int max = readCharacteristic(CameraCharacteristics.CONTROL_MAX_REGIONS_AE, 0);
+            max = Math.min(max, areas.size());
             holder.getBuilder(this).set(CaptureRequest.CONTROL_AE_REGIONS,
                     areas.subList(0, max).toArray(new MeteringRectangle[]{}));
         }
 
+        if (mSupportsTrigger) {
+            holder.getBuilder(this).set(
+                    CaptureRequest.CONTROL_AE_PRECAPTURE_TRIGGER,
+                    CaptureRequest.CONTROL_AE_PRECAPTURE_TRIGGER_START);
+        }
+
         // Apply
         holder.applyBuilder(this);
+        if (mSupportsTrigger) {
             setState(STATE_WAITING_PRECAPTURE);
+        } else {
+            setState(STATE_WAITING_PRECAPTURE_END);
+        }
     }
 
     @Override

cameraview/src/main/java/com/otaliastudios/cameraview/internal/DeviceEncoders.java

@@ -7,6 +7,7 @@ import android.media.MediaCodecInfo;
 import android.media.MediaCodecList;
 import android.media.MediaFormat;
 import android.os.Build;
+import android.util.Range;
 
 import androidx.annotation.NonNull;
 import androidx.annotation.Nullable;
@@ -196,10 +197,7 @@ public class DeviceEncoders {
                 public int compare(MediaCodecInfo o1, MediaCodecInfo o2) {
                     boolean hw1 = isHardwareEncoder(o1.getName());
                     boolean hw2 = isHardwareEncoder(o2.getName());
-                    if (hw1 && hw2) return 0;
-                    if (hw1) return -1;
-                    if (hw2) return 1;
-                    return 0;
+                    return Boolean.compare(hw2, hw1);
                 }
             });
         }
@@ -260,6 +258,28 @@ public class DeviceEncoders {
                     " Range:" + mVideoCapabilities.getSupportedHeights());
         }
 
+        // We cannot change the aspect ratio, but the max block count might also be the
+        // issue. Try to find a width that contains a height that would accept our AR.
+        try {
+            if (!mVideoCapabilities.getSupportedHeightsFor(width).contains(height)) {
+                int candidateWidth = width;
+                int minWidth = mVideoCapabilities.getSupportedWidths().getLower();
+                int widthAlignment = mVideoCapabilities.getWidthAlignment();
+                while (candidateWidth >= minWidth) {
+                    // Reduce by 32 and realign just in case, then check if our AR is now
+                    // supported. If it is, restart from scratch to go through the other checks.
+                    candidateWidth -= 32;
+                    while (candidateWidth % widthAlignment != 0) candidateWidth--;
+                    int candidateHeight = (int) Math.round(candidateWidth / aspect);
+                    if (mVideoCapabilities.getSupportedHeightsFor(candidateWidth)
+                            .contains(candidateHeight)) {
+                        LOG.w("getSupportedVideoSize - restarting with smaller size.");
+                        return getSupportedVideoSize(new Size(candidateWidth, candidateHeight));
+                    }
+                }
+            }
+        } catch (IllegalArgumentException ignore) {}
+
         // It's still possible that we're unsupported for other reasons.
         if (!mVideoCapabilities.isSizeSupported(width, height)) {
             throw new VideoException("Size not supported for unknown reason." +