AVAssetTrack.isPortrait

isPortrait.swift

extension CGAffineTransform {
    // Check the video track's preferred transform to determine if it was recorded in portrait mode.
    var isPortrait: Bool {
        if self.a == 0 && self.d == 0 && (self.b == 1.0 || self.b == -1.0) && (self.c == 1.0 || self.c == -1.0) {
            return true
        }
        return false
    }
}