ResolutionUtils.java
/*
* Copyright 2023 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package androidx.camera.core.streamsharing;
import static androidx.camera.core.impl.ImageFormatConstants.INTERNAL_DEFINED_IMAGE_FORMAT_PRIVATE;
import static androidx.camera.core.impl.ImageOutputConfig.OPTION_CUSTOM_ORDERED_RESOLUTIONS;
import static androidx.camera.core.impl.ImageOutputConfig.OPTION_SUPPORTED_RESOLUTIONS;
import android.os.Build;
import android.util.Pair;
import android.util.Size;
import android.view.Surface;
import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.annotation.RequiresApi;
import androidx.camera.core.impl.MutableConfig;
import androidx.camera.core.impl.UseCaseConfig;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
/**
* Utility methods for calculating resolutions.
*/
@RequiresApi(api = Build.VERSION_CODES.LOLLIPOP)
class ResolutionUtils {
private ResolutionUtils() {
}
/**
* Returns a list of {@link Surface} resolution sorted by priority.
*
* <p> This method calculates the resolution for the parent {@link StreamSharing} based on 1)
* the supported PRIV resolutions, 2) the sensor size and 3) the children's configs.
*/
static List<Size> getMergedResolutions(
@NonNull List<Size> cameraSupportedResolutions,
@NonNull Size sensorSize,
@NonNull MutableConfig parentConfig,
@NonNull Set<UseCaseConfig<?>> childrenConfigs) {
List<Size> result = mergeChildrenResolutions(childrenConfigs);
if (result == null) {
// Use camera supported resolutions if there is no requirement from children config.
result = cameraSupportedResolutions;
}
// Filter out resolutions that are not supported by the parent config (e.g. Extensions
// may have additional limitations on resolutions).
List<Pair<Integer, Size[]>> parentSupportedResolutions =
parentConfig.retrieveOption(OPTION_SUPPORTED_RESOLUTIONS, null);
if (parentSupportedResolutions != null) {
result = filterOutUnsupportedResolutions(result, parentSupportedResolutions,
INTERNAL_DEFINED_IMAGE_FORMAT_PRIVATE);
}
return result;
}
@Nullable
private static List<Size> mergeChildrenResolutions(
@NonNull Set<UseCaseConfig<?>> childrenConfigs) {
// TODO(b/264936115): This is a temporary placeholder solution that returns the config of
// VideoCapture if it exists. Later we will update it to actually merge the children's
// configs.
for (UseCaseConfig<?> childConfig : childrenConfigs) {
List<Size> customOrderedResolutions =
childConfig.retrieveOption(OPTION_CUSTOM_ORDERED_RESOLUTIONS, null);
if (customOrderedResolutions != null) {
return customOrderedResolutions;
}
}
return null;
}
/**
* Returns a list of resolution that all resolutions are supported.
*
* <p> The order of the {@code resolutionsToFilter} will be preserved in the resulting list.
*/
@NonNull
private static List<Size> filterOutUnsupportedResolutions(
@NonNull List<Size> resolutionsToFilter,
@NonNull List<Pair<Integer, Size[]>> supportedResolutions, int format) {
// Get resolutions to keep.
Set<Size> resolutionsToKeep = new HashSet<>();
for (Pair<Integer, Size[]> pair : supportedResolutions) {
if (pair.first.equals(format)) {
resolutionsToKeep = new HashSet<>(Arrays.asList(pair.second));
break;
}
}
// Filter out unsupported resolutions.
List<Size> result = new ArrayList<>();
for (Size resolution : resolutionsToFilter) {
if (resolutionsToKeep.contains(resolution)) {
result.add(resolution);
}
}
return result;
}
}