51 lines
1.7 KiB
C#
51 lines
1.7 KiB
C#
using System.Runtime.CompilerServices;
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using Microsoft.Net.Http.Headers;
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namespace Encoder;
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public static class Utils {
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private static readonly Tuple<int, int>[] QPTable = new Tuple<int, int>[] {
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new(1280*720, 64),
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new(1920*1080, 96),
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new(3840*2160, 128),
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new(5760*2880, 96), //VR6K
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new(8128*4096, 120) //VR8K
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}.OrderBy(t => t.Item1).ToArray();
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public static float Lerp(float v0, float v1, float t) {
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return v0 + t * (v1 - v0);
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}
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public static float Remap(float value, float from1, float to1, float from2, float to2) => from2 + (value - from1) * (to2 - from2) / (to1 - from1);
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public static int ToQPValue(int W, int H) {
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int pixels = W * H;
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for (var i = 0; i < QPTable.Length; i++) {
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if (pixels <= QPTable[i].Item1) {
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var minQP = QPTable[i - 1].Item2;
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var maxQP = QPTable[i].Item2;
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var minPixels = QPTable[i - 1].Item1;
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var maxPixels = QPTable[i].Item1;
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var tPixels = Remap(pixels, minPixels, maxPixels, 0, 1);
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return (int)Lerp(minQP, maxQP, tPixels);
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}
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}
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// Return the highest QP for anything higher than 8K VR
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return QPTable.Last().Item2;
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}
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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public static string AbsoluteOrProcessPath(this string path) {
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return Path.GetFullPath(Path.Combine(Path.GetDirectoryName(Environment.ProcessPath)!, path));
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}
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public static string? GetBoundary(string contentType)
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{
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var boundary = HeaderUtilities.RemoveQuotes(
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MediaTypeHeaderValue.Parse(contentType).Boundary
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).Value;
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return boundary;
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}
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} |