66 lines
2.2 KiB
C#
66 lines
2.2 KiB
C#
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using System;
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using System.Collections.Generic;
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using CRD.Utils.Parser.Utils;
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namespace CRD.Utils.Parser.Segments;
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public class TimelineTimeParser{
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public static int GetLiveRValue(dynamic attributes, long time, long duration){
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long now = (attributes.NOW + attributes.clientOffset) / 1000;
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long periodStartWC = attributes.availabilityStartTime + (attributes.periodStart ?? 0);
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long periodEndWC = now + (attributes.minimumUpdatePeriod ?? 0);
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long periodDuration = periodEndWC - periodStartWC;
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long timescale = attributes.timescale ?? 1;
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return (int)Math.Ceiling(((periodDuration * timescale) - time) / (double)duration);
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}
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public static List<dynamic> ParseByTimeline(dynamic attributes, IEnumerable<dynamic> segmentTimeline){
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var segments = new List<dynamic>();
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long time = -1;
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long timescale = attributes.timescale ?? 1;
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int startNumber = attributes.startNumber ?? 1;
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double timeline = attributes.periodStart;
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int sIndex = 0;
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foreach (var S in segmentTimeline){
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long duration = ObjectUtilities.GetMemberValue(S,"d");
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int repeat = ObjectUtilities.GetMemberValue(S,"r") ?? 0;
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long segmentTime = ObjectUtilities.GetMemberValue(S,"t") ?? 0;
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if (time < 0){
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// first segment
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time = segmentTime;
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}
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if (segmentTime > time){
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// discontinuity
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time = segmentTime;
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}
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int count;
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if (repeat < 0){
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count = GetLiveRValue(attributes, time, duration);
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} else{
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count = repeat + 1;
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}
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int end = startNumber + segments.Count + count;
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for (int number = startNumber + segments.Count; number < end; number++){
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segments.Add(new {
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number = number,
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duration = duration / (double)timescale,
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time = time,
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timeline = timeline
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});
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time += duration;
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}
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sIndex++;
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}
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return segments;
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}
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}
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