100 lines
3.1 KiB
C#
100 lines
3.1 KiB
C#
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using System;
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using System.Collections.Generic;
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using MediaBrowser.Model.Extensions;
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namespace MediaBrowser.Model.Dlna
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{
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public class ResolutionNormalizer
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{
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private static readonly ResolutionConfiguration[] Configurations =
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new []
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{
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new ResolutionConfiguration(426, 320000),
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new ResolutionConfiguration(640, 400000),
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new ResolutionConfiguration(720, 950000),
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new ResolutionConfiguration(1280, 2500000),
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new ResolutionConfiguration(1920, 4000000),
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new ResolutionConfiguration(3840, 35000000)
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};
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public static ResolutionOptions Normalize(int? inputBitrate,
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int? unused1,
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int? unused2,
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int outputBitrate,
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string inputCodec,
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string outputCodec,
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int? maxWidth,
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int? maxHeight)
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{
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// If the bitrate isn't changing, then don't downlscale the resolution
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if (inputBitrate.HasValue && outputBitrate >= inputBitrate.Value)
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{
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if (maxWidth.HasValue || maxHeight.HasValue)
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{
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return new ResolutionOptions
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{
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MaxWidth = maxWidth,
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MaxHeight = maxHeight
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};
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}
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}
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var resolutionConfig = GetResolutionConfiguration(outputBitrate);
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if (resolutionConfig != null)
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{
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var originvalValue = maxWidth;
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maxWidth = Math.Min(resolutionConfig.MaxWidth, maxWidth ?? resolutionConfig.MaxWidth);
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if (!originvalValue.HasValue || originvalValue.Value != maxWidth.Value)
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{
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maxHeight = null;
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}
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}
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return new ResolutionOptions
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{
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MaxWidth = maxWidth,
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MaxHeight = maxHeight
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};
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}
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private static ResolutionConfiguration GetResolutionConfiguration(int outputBitrate)
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{
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ResolutionConfiguration previousOption = null;
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foreach (var config in Configurations)
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{
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if (outputBitrate <= config.MaxBitrate)
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{
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return previousOption ?? config;
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}
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previousOption = config;
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}
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return null;
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}
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private static double GetVideoBitrateScaleFactor(string codec)
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{
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if (StringHelper.EqualsIgnoreCase(codec, "h265") ||
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StringHelper.EqualsIgnoreCase(codec, "hevc") ||
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StringHelper.EqualsIgnoreCase(codec, "vp9"))
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{
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return .5;
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}
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return 1;
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}
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public static int ScaleBitrate(int bitrate, string inputVideoCodec, string outputVideoCodec)
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{
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var inputScaleFactor = GetVideoBitrateScaleFactor(inputVideoCodec);
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var outputScaleFactor = GetVideoBitrateScaleFactor(outputVideoCodec);
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var scaleFactor = outputScaleFactor/inputScaleFactor;
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var newBitrate = scaleFactor*bitrate;
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return Convert.ToInt32(newBitrate);
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}
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}
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}
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