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fun findShortLongCameraPair(manager: CameraManager, facing: Int? = null): DualCamera? { | |
return findDualCameras(manager, facing).map { | |
val characteristics1 = manager.getCameraCharacteristics(it.physicalId1) | |
val characteristics2 = manager.getCameraCharacteristics(it.physicalId2) | |
// Query the focal lengths advertised by each physical camera | |
val focalLengths1 = characteristics1.get( | |
CameraCharacteristics.LENS_INFO_AVAILABLE_FOCAL_LENGTHS) ?: floatArrayOf(0F) | |
val focalLengths2 = characteristics2.get( | |
CameraCharacteristics.LENS_INFO_AVAILABLE_FOCAL_LENGTHS) ?: floatArrayOf(0F) | |
// Compute the largest difference between min and max focal lengths between cameras | |
val focalLengthsDiff1 = focalLengths2.max()!! - focalLengths1.min()!! | |
val focalLengthsDiff2 = focalLengths1.max()!! - focalLengths2.min()!! | |
// Return the pair of camera IDs and the difference between min and max focal lengths | |
if (focalLengthsDiff1 < focalLengthsDiff2) { | |
Pair(DualCamera(it.logicalId, it.physicalId1, it.physicalId2), focalLengthsDiff1) | |
} else { | |
Pair(DualCamera(it.logicalId, it.physicalId2, it.physicalId1), focalLengthsDiff2) | |
} | |
// Return only the pair with the largest difference, or null if no pairs are found | |
}.sortedBy { it.second }.reversed().lastOrNull()?.first | |
} |
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