VideoEncodingPropertiesExtensions.cs

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using System;
using PhotoSharingApp.Universal.Camera;
using Windows.Media.MediaProperties;

namespace PhotoSharingApp.Universal.Extensions
{
    /// <summary>
    /// Provides extension methods for the <see cref="VideoEncodingProperties" /> class.
    /// </summary>
    public static class VideoEncodingPropertiesExtensions
    {
        /// <summary>
        /// The 16/9 aspect ratio
        /// </summary>
        public const double AspectRatio16To9 = 16.0 / 9.0;

        /// <summary>
        /// The 4/3 aspect ratio
        /// </summary>
        public const double AspectRatio4To3 = 4.0 / 3.0;

        /// <summary>
        /// Gets the aspect ratio for the given <see cref="IVideoEncodingProperties" /> instance.
        /// </summary>
        /// <param name="encodingProperties">The encoding properties.</param>
        /// <returns>The Aspect ratio.</returns>
        public static AspectRatio GetAspectRatio(this VideoEncodingProperties encodingProperties)
        {
            return GetAspectRatio(encodingProperties.Width, encodingProperties.Height);
        }

        /// <summary>
        /// Gets the aspect ratio.
        /// </summary>
        /// <param name="width">The width.</param>
        /// <param name="height">The height.</param>
        /// <returns>The Aspect ratio.</returns>
        public static AspectRatio GetAspectRatio(double width, double height)
        {
            var ratio = width / height;

            if (Math.Abs(ratio - AspectRatio16To9) <= 0.1)
            {
                return AspectRatio.Ratio16To9;
            }

            if (Math.Abs(ratio - AspectRatio4To3) <= 0.1)
            {
                return AspectRatio.Ratio4To3;
            }

            return AspectRatio.Unknown;
        }
    }
}