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jellyfin/MediaBrowser.Model/Dlna/ResolutionNormalizer.cs

100 lines
3.2 KiB

#nullable disable
#pragma warning disable CS1591
using System;
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namespace MediaBrowser.Model.Dlna
{
public static class ResolutionNormalizer
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{
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private static readonly ResolutionConfiguration[] Configurations =
new[]
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{
new ResolutionConfiguration(426, 320000),
new ResolutionConfiguration(640, 400000),
new ResolutionConfiguration(720, 950000),
new ResolutionConfiguration(1280, 2500000),
new ResolutionConfiguration(1920, 4000000),
new ResolutionConfiguration(2560, 20000000),
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new ResolutionConfiguration(3840, 35000000)
};
public static ResolutionOptions Normalize(
int? inputBitrate,
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int outputBitrate,
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int? maxWidth,
int? maxHeight)
{
// If the bitrate isn't changing, then don't downscale the resolution
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if (inputBitrate.HasValue && outputBitrate >= inputBitrate.Value)
{
if (maxWidth.HasValue || maxHeight.HasValue)
{
return new ResolutionOptions
{
MaxWidth = maxWidth,
MaxHeight = maxHeight
};
}
}
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var resolutionConfig = GetResolutionConfiguration(outputBitrate);
if (resolutionConfig != null)
{
var originvalValue = maxWidth;
maxWidth = Math.Min(resolutionConfig.MaxWidth, maxWidth ?? resolutionConfig.MaxWidth);
if (!originvalValue.HasValue || originvalValue.Value != maxWidth.Value)
{
maxHeight = null;
}
}
return new ResolutionOptions
{
MaxWidth = maxWidth,
MaxHeight = maxHeight
};
}
private static ResolutionConfiguration GetResolutionConfiguration(int outputBitrate)
{
ResolutionConfiguration previousOption = null;
foreach (var config in Configurations)
{
if (outputBitrate <= config.MaxBitrate)
{
return previousOption ?? config;
}
previousOption = config;
}
return null;
}
private static double GetVideoBitrateScaleFactor(string codec)
{
if (string.Equals(codec, "h265", StringComparison.OrdinalIgnoreCase)
|| string.Equals(codec, "hevc", StringComparison.OrdinalIgnoreCase)
|| string.Equals(codec, "vp9", StringComparison.OrdinalIgnoreCase))
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{
return .6;
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}
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return 1;
}
public static int ScaleBitrate(int bitrate, string inputVideoCodec, string outputVideoCodec)
{
var inputScaleFactor = GetVideoBitrateScaleFactor(inputVideoCodec);
var outputScaleFactor = GetVideoBitrateScaleFactor(outputVideoCodec);
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var scaleFactor = outputScaleFactor / inputScaleFactor;
var newBitrate = scaleFactor * bitrate;
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return Convert.ToInt32(newBitrate);
}
}
}