89 lines
3.6 KiB
C#
89 lines
3.6 KiB
C#
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using System;
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using System.Collections.Generic;
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using System.Linq;
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namespace CRD.Utils.Parser.Segments;
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public class DurationTimeParser{
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public static int? ParseEndNumber(string endNumber){
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if (!int.TryParse(endNumber, out var parsedEndNumber)){
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return null;
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}
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return parsedEndNumber;
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}
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public static dynamic GetSegmentRangeStatic(dynamic attributes){
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int timescale = attributes.timescale ?? 1;
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double segmentDuration = (double)attributes.duration / timescale;
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int? endNumber = ParseEndNumber(attributes.endNumber as string);
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if (endNumber.HasValue){
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return new{ start = 0, end = endNumber.Value };
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}
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if (attributes.periodDuration is double periodDuration){
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return new{ start = 0, end = (int)(periodDuration / segmentDuration) };
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}
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return new{ start = 0, end = (int)(attributes.sourceDuration / segmentDuration) };
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}
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public static dynamic GetSegmentRangeDynamic(dynamic attributes){
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long now = (attributes.NOW + attributes.clientOffset) / 1000;
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long periodStartWC = attributes.availabilityStartTime + attributes.periodStart;
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long periodEndWC = now + attributes.minimumUpdatePeriod;
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long periodDuration = periodEndWC - periodStartWC;
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int timescale = attributes.timescale ?? 1;
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int segmentCount = (int)Math.Ceiling(periodDuration * timescale / (double)attributes.duration);
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int availableStart = (int)Math.Floor((now - periodStartWC - attributes.timeShiftBufferDepth) * timescale / (double)attributes.duration);
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int availableEnd = (int)Math.Floor((now - periodStartWC) * timescale / (double)attributes.duration);
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int? endNumber = ParseEndNumber(attributes.endNumber as string);
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int end = endNumber.HasValue ? endNumber.Value : Math.Min(segmentCount, availableEnd);
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return new{ start = Math.Max(0, availableStart), end = end };
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}
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public static List<dynamic> ToSegments(dynamic attributes, int number){
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int timescale = attributes.timescale ?? 1;
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long periodStart = attributes.periodStart;
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int startNumber = attributes.startNumber ?? 1;
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return new List<dynamic>{
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new{
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number = startNumber + number,
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duration = (double)attributes.duration / timescale,
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timeline = periodStart,
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time = number * attributes.duration
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}
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};
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}
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public static IEnumerable<dynamic> ParseByDuration(dynamic attributes){
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var type = (string)attributes.type;
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var rangeFunction = type == "static" ? (Func<dynamic, dynamic>)GetSegmentRangeStatic : GetSegmentRangeDynamic;
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dynamic times = rangeFunction(attributes);
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List<int> d = Range(times.start, times.end - times.start);
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List<dynamic> segments = d.Select(number => ToSegments(attributes, number)).ToList();
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// Adjust the duration of the last segment for static type
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if (type == "static" && segments.Any()){
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var lastSegmentIndex = segments.Count - 1;
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double sectionDuration = attributes.periodDuration is double periodDuration ? periodDuration : attributes.sourceDuration;
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segments[lastSegmentIndex].duration = sectionDuration - ((double)attributes.duration / (attributes.timescale ?? 1) * lastSegmentIndex);
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}
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return segments;
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}
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public static List<int> Range(int start, int end){
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List<int> res = new List<int>();
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for (int i = start; i < end; i++){
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res.Add(i);
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}
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return res;
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}
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}
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