107 lines
4.6 KiB
C#
107 lines
4.6 KiB
C#
using System.Collections.Generic;
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using System.Dynamic;
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using System.Linq;
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using System.Text.RegularExpressions;
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using CRD.Utils.Parser.Utils;
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namespace CRD.Utils.Parser.Segments;
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public class SegmentTemplate{
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public static List<dynamic> SegmentsFromTemplate(dynamic attributes, List<dynamic> segmentTimeline){
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dynamic templateValues = new ExpandoObject();
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templateValues.RepresentationID = ObjectUtilities.GetMemberValue(attributes,"id");
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templateValues.Bandwidth = ObjectUtilities.GetMemberValue(attributes,"bandwidth") ?? 0;
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dynamic initialization = attributes.initialization ?? new{ sourceURL = string.Empty, range = string.Empty };
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dynamic mapSegment = UrlType.UrlTypeToSegment(new{
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baseUrl = ObjectUtilities.GetMemberValue(attributes,"baseUrl"),
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source = ConstructTemplateUrl(initialization.sourceURL, templateValues),
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range = ObjectUtilities.GetMemberValue(initialization,"range")
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});
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List<dynamic> segments = ParseTemplateInfo(attributes, segmentTimeline);
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return segments.Select(segment => {
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templateValues.Number = ObjectUtilities.GetMemberValue(segment,"number");
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templateValues.Time = ObjectUtilities.GetMemberValue(segment,"time");
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var uri = ConstructTemplateUrl(ObjectUtilities.GetMemberValue(attributes,"media") ?? "", templateValues);
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var timescale = ObjectUtilities.GetMemberValue(attributes,"timescale") ?? 1;
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var presentationTimeOffset = ObjectUtilities.GetMemberValue(attributes,"presentationTimeOffset") ?? 0;
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double presentationTime = ObjectUtilities.GetMemberValue(attributes,"periodStart") + ((ObjectUtilities.GetMemberValue(segment,"time") - presentationTimeOffset) / (double) timescale);
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dynamic map = new ExpandoObject();
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map.uri = uri;
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map.timeline = ObjectUtilities.GetMemberValue(segment,"timeline");
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map.duration = ObjectUtilities.GetMemberValue(segment,"duration");
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map.resolvedUri = UrlUtils.ResolveUrl(ObjectUtilities.GetMemberValue(attributes,"baseUrl") ?? "", uri);
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map.map = mapSegment;
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map.number = ObjectUtilities.GetMemberValue(segment,"number");
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map.presentationTime = presentationTime;
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return map;
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}).ToList();
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}
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private static readonly Regex IdentifierPattern = new Regex(@"\$([A-Za-z]*)(?:(%0)([0-9]+)d)?\$", RegexOptions.Compiled);
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public static string ConstructTemplateUrl(string url, dynamic values){
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// Convert dynamic to IDictionary<string, object> for easier handling
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var valuesDictionary = (IDictionary<string, object>)values;
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return IdentifierPattern.Replace(url, match => IdentifierReplacement(match, valuesDictionary));
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}
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private static string IdentifierReplacement(Match match, IDictionary<string, object> values){
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if (match.Value == "$$"){
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// escape sequence
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return "$";
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}
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var identifier = match.Groups[1].Value;
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var format = match.Groups[2].Value;
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var widthStr = match.Groups[3].Value;
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if (!values.ContainsKey(identifier)){
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return match.Value;
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}
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var value = values[identifier]?.ToString() ?? "";
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if (identifier == "RepresentationID"){
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// Format tag shall not be present with RepresentationID
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return value;
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}
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int width = string.IsNullOrEmpty(format) ? 1 : int.Parse(widthStr);
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if (value.Length >= width){
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return value;
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}
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return value.PadLeft(width, '0');
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}
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public static List<dynamic> ParseTemplateInfo(dynamic attributes, List<dynamic> segmentTimeline){
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// Check if duration and SegmentTimeline are not present
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if (ObjectUtilities.GetMemberValue(attributes,"duration") == null && segmentTimeline == null){
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// Exactly one media segment expected
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return new List<dynamic>{
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new{
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number = ObjectUtilities.GetMemberValue(attributes,"startNumber") ?? 1,
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duration = ObjectUtilities.GetMemberValue(attributes,"sourceDuration"),
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time = 0,
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timeline = ObjectUtilities.GetMemberValue(attributes,"periodStart")
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}
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};
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}
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if (ObjectUtilities.GetMemberValue(attributes,"duration") != null){
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// Parse segments based on duration
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return DurationTimeParser.ParseByDuration(attributes);
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}
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// Parse segments based on SegmentTimeline
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return TimelineTimeParser.ParseByTimeline(attributes, segmentTimeline);
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}
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} |