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N_m3u8DL-RE
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修复MPD解析过慢问题 (#493)

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nilaoda 2024-11-18 21:20:39 +08:00 committed by GitHub
parent 5a56e34cd5
commit 3cd3bb9516
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1 changed files with 12 additions and 12 deletions
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24
src/N_m3u8DL-RE.Parser/Extractor/DASHExtractor2.cs
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@ -45,7 +45,7 @@ internal class DASHExtractor2 : IExtractor
private string ExtendBaseUrl(XElement element, string oriBaseUrl)
{
var target = element.Elements().Where(e => e.Name.LocalName == "BaseURL").FirstOrDefault();
var target = element.Elements().FirstOrDefault(e => e.Name.LocalName == "BaseURL");
if (target != null)
{
oriBaseUrl = ParserUtil.CombineURL(oriBaseUrl, target.Value);
@ -57,7 +57,7 @@ internal class DASHExtractor2 : IExtractor
private double? GetFrameRate(XElement element)
{
var frameRate = element.Attribute("frameRate")?.Value;
if (frameRate != null && frameRate.Contains("/"))
if (frameRate != null && frameRate.Contains('/'))
{
var d = Convert.ToDouble(frameRate.Split('/')[0]) / Convert.ToDouble(frameRate.Split('/')[1]);
frameRate = d.ToString("0.000");
@ -100,7 +100,7 @@ internal class DASHExtractor2 : IExtractor
var mediaPresentationDuration = mpdElement.Attribute("mediaPresentationDuration")?.Value;
// 读取在MPD开头定义的<BaseURL>，并替换本身的URL
var baseUrlElement = mpdElement.Elements().Where(e => e.Name.LocalName == "BaseURL").FirstOrDefault();
var baseUrlElement = mpdElement.Elements().FirstOrDefault(e => e.Name.LocalName == "BaseURL");
if (baseUrlElement != null)
{
var baseUrl = baseUrlElement.Value;
@ -185,7 +185,7 @@ internal class DASHExtractor2 : IExtractor
streamSpec.MediaType = MediaType.SUBTITLES;
}
// 优化字幕场景识别
var role = representation.Elements().Where(e => e.Name.LocalName == "Role").FirstOrDefault() ?? adaptationSet.Elements().Where(e => e.Name.LocalName == "Role").FirstOrDefault();
var role = representation.Elements().FirstOrDefault(e => e.Name.LocalName == "Role") ?? adaptationSet.Elements().FirstOrDefault(e => e.Name.LocalName == "Role");
if (role != null)
{
var v = role.Attribute("value")?.Value;
@ -209,7 +209,7 @@ internal class DASHExtractor2 : IExtractor
}
// 读取声道数量
var audioChannelConfiguration = adaptationSet.Elements().Concat(representation.Elements()).Where(e => e.Name.LocalName == "AudioChannelConfiguration").FirstOrDefault();
var audioChannelConfiguration = adaptationSet.Elements().Concat(representation.Elements()).FirstOrDefault(e => e.Name.LocalName == "AudioChannelConfiguration");
if (audioChannelConfiguration != null)
{
streamSpec.Channels = audioChannelConfiguration.Attribute("value")?.Value;
@ -223,11 +223,11 @@ internal class DASHExtractor2 : IExtractor
// 第一种形式 SegmentBase
var segmentBaseElement = representation.Elements().Where(e => e.Name.LocalName == "SegmentBase").FirstOrDefault();
var segmentBaseElement = representation.Elements().FirstOrDefault(e => e.Name.LocalName == "SegmentBase");
if (segmentBaseElement != null)
{
// 处理init url
var initialization = segmentBaseElement.Elements().Where(e => e.Name.LocalName == "Initialization").FirstOrDefault();
var initialization = segmentBaseElement.Elements().FirstOrDefault(e => e.Name.LocalName == "Initialization");
if (initialization != null)
{
var sourceURL = initialization.Attribute("sourceURL")?.Value;
@ -261,12 +261,12 @@ internal class DASHExtractor2 : IExtractor
}
// 第二种形式 SegmentList.SegmentList
var segmentList = representation.Elements().Where(e => e.Name.LocalName == "SegmentList").FirstOrDefault();
var segmentList = representation.Elements().FirstOrDefault(e => e.Name.LocalName == "SegmentList");
if (segmentList != null)
{
var durationStr = segmentList.Attribute("duration")?.Value;
// 处理init url
var initialization = segmentList.Elements().Where(e => e.Name.LocalName == "Initialization").FirstOrDefault();
var initialization = segmentList.Elements().FirstOrDefault(e => e.Name.LocalName == "Initialization");
if (initialization != null)
{
var initUrl = ParserUtil.CombineURL(segBaseUrl, initialization.Attribute("sourceURL")?.Value!);
@ -282,9 +282,9 @@ internal class DASHExtractor2 : IExtractor
}
}
// 处理分片
var segmentURLs = segmentList.Elements().Where(e => e.Name.LocalName == "SegmentURL");
var segmentURLs = segmentList.Elements().Where(e => e.Name.LocalName == "SegmentURL").ToList();
var timescaleStr = segmentList.Attribute("timescale")?.Value ?? "1";
for (int segmentIndex = 0; segmentIndex < segmentURLs.Count(); segmentIndex++)
for (int segmentIndex = 0; segmentIndex < segmentURLs.Count; segmentIndex++)
{
var segmentURL = segmentURLs.ElementAt(segmentIndex);
var mediaUrl = ParserUtil.CombineURL(segBaseUrl, segmentURL.Attribute("media")?.Value!);
@ -338,7 +338,7 @@ internal class DASHExtractor2 : IExtractor
}
// 处理分片
var mediaTemplate = segmentTemplate.Attribute("media")?.Value ?? segmentTemplateOuter.Attribute("media")?.Value;
var segmentTimeline = segmentTemplate.Elements().Where(e => e.Name.LocalName == "SegmentTimeline").FirstOrDefault();
var segmentTimeline = segmentTemplate.Elements().FirstOrDefault(e => e.Name.LocalName == "SegmentTimeline");
if (segmentTimeline != null)
{
// 使用了SegmentTimeline 结果精确