602 lines
24 KiB
C#
602 lines
24 KiB
C#
using System;
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using System.Collections.Generic;
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using System.IO;
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using System.Net.Http;
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using System.Security.Cryptography;
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using System.Text.RegularExpressions;
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using System.Threading.Tasks;
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using CRD.Downloader;
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using CRD.Utils.Parser.Utils;
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using CRD.Utils.Structs;
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using Newtonsoft.Json;
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namespace CRD.Utils.HLS;
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public class HlsDownloader{
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private Data _data = new();
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private CrunchyEpMeta _currentEpMeta;
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private bool _isVideo;
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private bool _isAudio;
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public HlsDownloader(HlsOptions options, CrunchyEpMeta meta, bool isVideo, bool isAudio){
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if (options == null || options.M3U8Json == null || options.M3U8Json.Segments == null){
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throw new Exception("Playlist is empty");
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}
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_currentEpMeta = meta;
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_isVideo = isVideo;
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_isAudio = isAudio;
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if (options?.M3U8Json != null)
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_data = new Data{
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Parts = new PartsData{
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First = options.M3U8Json.MediaSequence ?? 0,
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Total = options.M3U8Json.Segments?.Count,
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Completed = 0,
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},
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M3U8Json = options.M3U8Json,
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OutputFile = options.Output ?? "stream.ts",
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Threads = options.Threads ?? 5,
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Retries = options.Retries ?? 4,
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Offset = options.Offset ?? 0,
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BaseUrl = options.BaseUrl,
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SkipInit = options.SkipInit ?? false,
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Timeout = options.Timeout ?? 60 * 1000,
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CheckPartLength = true,
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IsResume = options.Offset.HasValue && options.Offset.Value > 0,
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BytesDownloaded = 0,
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WaitTime = options.FsRetryTime ?? 1000 * 5,
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Override = options.Override,
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DateStart = 0
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};
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}
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public async Task<(bool Ok, PartsData Parts)> Download(){
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string fn = _data.OutputFile ?? string.Empty;
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if (File.Exists(fn) && File.Exists($"{fn}.resume") && _data.Offset < 1){
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try{
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Console.WriteLine("Resume data found! Trying to resume...");
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string resumeFileContent = File.ReadAllText($"{fn}.resume");
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var resumeData = JsonConvert.DeserializeObject<ResumeData>(resumeFileContent);
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if (resumeData != null){
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if (resumeData.Total == _data.M3U8Json?.Segments.Count &&
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resumeData.Completed != resumeData.Total &&
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!double.IsNaN(resumeData.Completed)){
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Console.WriteLine("Resume data is ok!");
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_data.Offset = resumeData.Completed;
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_data.IsResume = true;
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} else{
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if (resumeData.Total == _data.M3U8Json?.Segments.Count &&
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resumeData.Completed == resumeData.Total &&
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!double.IsNaN(resumeData.Completed)){
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Console.WriteLine("Already finished");
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return (Ok: true, _data.Parts);
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}
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Console.WriteLine("Resume data is wrong!");
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Console.WriteLine($"Resume: {{ total: {resumeData.Total}, dled: {resumeData.Completed} }}, " +
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$"Current: {{ total: {_data.M3U8Json?.Segments.Count} }}");
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}
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} else{
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Console.WriteLine("Resume data is wrong!");
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Console.WriteLine($"Resume: {{ total: {resumeData?.Total}, dled: {resumeData?.Completed} }}, " +
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$"Current: {{ total: {_data.M3U8Json?.Segments.Count} }}");
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}
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} catch (Exception e){
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Console.Error.WriteLine("Resume failed, downloading will not be resumed!");
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Console.Error.WriteLine(e.Message);
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}
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}
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// Check if the file exists and it is not a resume download
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if (File.Exists(fn) && !_data.IsResume){
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string rwts = _data.Override ?? "Y";
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rwts = rwts.ToUpper(); // ?? "N"
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if (rwts.StartsWith("Y")){
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Console.WriteLine($"Deleting «{fn}»...");
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File.Delete(fn);
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} else if (rwts.StartsWith("C")){
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return (Ok: true, _data.Parts);
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} else{
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return (Ok: false, _data.Parts);
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}
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}
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// Show output filename based on whether it's a resume
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if (File.Exists(fn) && _data.IsResume){
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Console.WriteLine($"Adding content to «{fn}»...");
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} else{
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Console.WriteLine($"Saving stream to «{fn}»...");
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}
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// Start time
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_data.DateStart = DateTimeOffset.Now.ToUnixTimeMilliseconds();
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if (_data.M3U8Json != null){
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List<dynamic> segments = _data.M3U8Json.Segments;
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// map has init uri outside is none init uri
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// Download init part
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if (segments[0].map != null && _data.Offset == 0 && !_data.SkipInit){
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Console.WriteLine("Download and save init part...");
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Segment initSeg = new Segment();
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initSeg.Uri = ObjectUtilities.GetMemberValue(segments[0].map, "uri");
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initSeg.Key = ObjectUtilities.GetMemberValue(segments[0].map, "key");
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initSeg.ByteRange = ObjectUtilities.GetMemberValue(segments[0].map, "byteRange");
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if (ObjectUtilities.GetMemberValue(segments[0], "key") != null){
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initSeg.Key = segments[0].Key;
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}
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try{
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var initDl = await DownloadPart(initSeg, 0, 0);
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await File.WriteAllBytesAsync(fn, initDl);
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await File.WriteAllTextAsync($"{fn}.resume", JsonConvert.SerializeObject(new{ completed = 0, total = segments.Count }));
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Console.WriteLine("Init part downloaded.");
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} catch (Exception e){
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Console.Error.WriteLine($"Part init download error:\n\t{e.Message}");
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return (false, this._data.Parts);
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}
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} else if (segments[0].map != null && this._data.Offset == 0 && this._data.SkipInit){
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Console.WriteLine("Skipping init part can lead to broken video!");
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}
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// Resuming ...
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if (_data.Offset > 0){
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segments = segments.GetRange(_data.Offset, segments.Count - _data.Offset);
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Console.WriteLine($"Resuming download from part {_data.Offset + 1}...");
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_data.Parts.Completed = _data.Offset;
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}
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for (int p = 0; p < Math.Ceiling((double)segments.Count / _data.Threads); p++){
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int offset = p * _data.Threads;
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int dlOffset = Math.Min(offset + _data.Threads, segments.Count);
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int errorCount = 0;
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Dictionary<string, Task> keyTasks = new Dictionary<string, Task>();
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Dictionary<int, Task<byte[]>> partTasks = new Dictionary<int, Task<byte[]>>();
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List<byte[]> results = new List<byte[]>(new byte[dlOffset - offset][]);
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// Download keys
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for (int px = offset; px < dlOffset; px++){
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var curSegment = segments[px];
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var key = ObjectUtilities.GetMemberValue(curSegment, "key");
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if (key != null && !keyTasks.ContainsKey(key?.Uri) && !_data.Keys.ContainsKey(key?.Uri)){
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keyTasks[curSegment.Key.Uri] = DownloadKey(curSegment.Key, px, _data.Offset);
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}
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}
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try{
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await Task.WhenAll(keyTasks.Values);
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} catch (Exception ex){
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Console.Error.WriteLine($"Error downloading keys: {ex.Message}");
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throw;
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}
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for (int px = offset; px < dlOffset && px < segments.Count; px++){
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var segment = new Segment();
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segment.Uri = ObjectUtilities.GetMemberValue(segments[px], "uri");
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segment.Key = ObjectUtilities.GetMemberValue(segments[px], "key");
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segment.ByteRange = ObjectUtilities.GetMemberValue(segments[px], "byteRange");
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partTasks[px] = DownloadPart(segment, px, _data.Offset);
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}
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while (partTasks.Count > 0){
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Task<byte[]> completedTask = await Task.WhenAny(partTasks.Values);
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int completedIndex = -1;
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foreach (var task in partTasks){
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if (task.Value == completedTask){
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completedIndex = task.Key;
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break;
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}
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}
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if (completedIndex != -1){
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try{
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byte[] result = await completedTask;
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results[completedIndex - offset] = result;
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partTasks.Remove(completedIndex);
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} catch (Exception ex){
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Console.Error.WriteLine($"Part {completedIndex + 1 + _data.Offset} download error:\n\t{ex.Message}");
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partTasks.Remove(completedIndex);
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errorCount++;
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}
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}
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}
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if (errorCount > 0){
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Console.Error.WriteLine($"{errorCount} parts not downloaded");
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return (false, _data.Parts);
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}
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foreach (var part in results){
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int attempt = 0;
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bool writeSuccess = false;
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while (attempt < 3 && !writeSuccess){
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try{
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using (var stream = new FileStream(fn, FileMode.Append, FileAccess.Write, FileShare.None)){
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await stream.WriteAsync(part, 0, part.Length);
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}
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writeSuccess = true;
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} catch (Exception ex){
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Console.Error.WriteLine(ex);
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Console.Error.WriteLine($"Unable to write to file '{fn}' (Attempt {attempt + 1}/3)");
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Console.WriteLine($"Waiting {Math.Round(_data.WaitTime / 1000.0)}s before retrying");
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await Task.Delay(_data.WaitTime);
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attempt++;
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}
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}
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if (!writeSuccess){
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Console.Error.WriteLine($"Unable to write content to '{fn}'.");
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return (Ok: false, _data.Parts);
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}
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}
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int totalSeg = _data.Parts.Total; // + _data.Offset
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int downloadedSeg = Math.Min(dlOffset, totalSeg);
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_data.Parts.Completed = downloadedSeg + _data.Offset; //
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var dataLog = GetDownloadInfo(_data.DateStart, _data.Parts.Completed, totalSeg, _data.BytesDownloaded);
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// Save resume data to file
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string resumeDataJson = JsonConvert.SerializeObject(new{ _data.Parts.Completed, Total = totalSeg });
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File.WriteAllText($"{fn}.resume", resumeDataJson);
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// Log progress
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Console.WriteLine($"{_data.Parts.Completed} of {totalSeg} parts downloaded [{dataLog.Percent}%] ({FormatTime(dataLog.Time / 1000)} | {dataLog.DownloadSpeed / 1000000.0:F2}Mb/s)");
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_currentEpMeta.DownloadProgress = new DownloadProgress(){
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IsDownloading = true,
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Percent = dataLog.Percent,
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Time = dataLog.Time,
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DownloadSpeed = dataLog.DownloadSpeed,
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Doing = _isAudio ? "Downloading Audio" : (_isVideo ? "Downloading Video" : "")
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};
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if (!Crunchyroll.Instance.Queue.Contains(_currentEpMeta)){
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return (Ok: false, _data.Parts);
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}
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Crunchyroll.Instance.Queue.Refresh();
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while (_currentEpMeta.Paused){
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await Task.Delay(500);
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if (!Crunchyroll.Instance.Queue.Contains(_currentEpMeta)){
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return (Ok: false, _data.Parts);
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}
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}
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}
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}
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return (Ok: true, _data.Parts);
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}
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public static Info GetDownloadInfo(long dateStartUnix, int partsDownloaded, int partsTotal, long downloadedBytes){
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// Convert Unix timestamp to DateTime
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DateTime dateStart = DateTimeOffset.FromUnixTimeMilliseconds(dateStartUnix).UtcDateTime;
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double dateElapsed = (DateTime.UtcNow - dateStart).TotalMilliseconds;
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// Calculate percentage
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int percentFixed = (int)((double)partsDownloaded / partsTotal * 100);
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int percent = percentFixed < 100 ? percentFixed : (partsTotal == partsDownloaded ? 100 : 99);
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// Calculate remaining time estimate
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double remainingTime = dateElapsed * (partsTotal / (double)partsDownloaded - 1);
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// Calculate download speed (bytes per second)
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double downloadSpeed = downloadedBytes / (dateElapsed / 1000);
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return new Info{
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Percent = percent,
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Time = remainingTime,
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DownloadSpeed = downloadSpeed
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};
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}
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private string FormatTime(double seconds){
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TimeSpan timeSpan = TimeSpan.FromSeconds(seconds);
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return timeSpan.ToString(@"hh\:mm\:ss");
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}
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public async Task<byte[]> DownloadPart(Segment seg, int segIndex, int segOffset){
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string sUri = GetUri(seg.Uri ?? "", _data.BaseUrl);
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byte[]? dec = null;
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int p = segIndex;
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try{
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byte[]? part;
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if (seg.Key != null){
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var decipher = await GetKey(seg.Key, p, segOffset);
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part = await GetData(p, sUri, seg.ByteRange != null ? seg.ByteRange.ToDictionary() : new Dictionary<string, string>(), segOffset, false, _data.Timeout, _data.Retries);
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var partContent = part;
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using (decipher){
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if (partContent != null) dec = decipher.TransformFinalBlock(partContent, 0, partContent.Length);
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}
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if (dec != null) _data.BytesDownloaded += dec.Length;
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} else{
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part = await GetData(p, sUri, seg.ByteRange != null ? seg.ByteRange.ToDictionary() : new Dictionary<string, string>(), segOffset, false, _data.Timeout, _data.Retries);
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dec = part;
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if (dec != null) _data.BytesDownloaded += dec.Length;
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}
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} catch (Exception ex){
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throw new Exception($"Error at segment {p}: {ex.Message}", ex);
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}
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return dec ?? Array.Empty<byte>();
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}
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private async Task<ICryptoTransform> GetKey(Key key, int segIndex, int segOffset){
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string kUri = GetUri(key.Uri ?? "", _data.BaseUrl);
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int p = segIndex;
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if (!_data.Keys.ContainsKey(kUri)){
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try{
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var rkey = await DownloadKey(key, segIndex, segOffset);
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if (rkey == null)
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throw new Exception("Failed to download key");
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_data.Keys[kUri] = rkey;
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} catch (Exception ex){
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throw new Exception($"Error at segment {p}: {ex.Message}", ex);
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}
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}
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byte[] iv = new byte[16];
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var ivs = key.Iv; //?? new List<int>{ 0, 0, 0, p + 1 }
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for (int i = 0; i < ivs.Count; i++){
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byte[] bytes = BitConverter.GetBytes(ivs[i]);
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// Ensure the bytes are in big-endian order
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if (BitConverter.IsLittleEndian){
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Array.Reverse(bytes);
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}
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bytes.CopyTo(iv, i * 4);
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}
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ICryptoTransform decryptor;
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using (Aes aes = Aes.Create()){
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aes.Key = _data.Keys[kUri];
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aes.IV = iv;
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aes.Mode = CipherMode.CBC;
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aes.Padding = PaddingMode.PKCS7;
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decryptor = aes.CreateDecryptor();
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}
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// var decryptor = new AesCryptoServiceProvider{
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// Key = _data.Keys[kUri],
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// IV = iv,
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// Mode = CipherMode.CBC,
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// Padding = PaddingMode.PKCS7
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// }.CreateDecryptor();
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return decryptor;
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}
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public async Task<byte[]> DownloadKey(Key key, int segIndex, int segOffset){
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string kUri = GetUri(key.Uri ?? "", _data.BaseUrl);
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if (!_data.Keys.ContainsKey(kUri)){
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try{
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var rkey = await GetData(segIndex, kUri, new Dictionary<string, string>(), segOffset, true, _data.Timeout, _data.Retries);
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if (rkey == null || rkey.Length != 16){
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throw new Exception("Key not fully downloaded or is incorrect.");
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}
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_data.Keys[kUri] = rkey;
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return rkey;
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} catch (Exception ex){
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ex.Data["SegmentIndex"] = segIndex; // Adding custom data to the exception
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throw;
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}
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}
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return _data.Keys[kUri];
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}
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public async Task<byte[]?> GetData(int partIndex, string uri, IDictionary<string, string> headers, int segOffset, bool isKey, int timeout, int retryCount){
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// Handle local file URI
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if (uri.StartsWith("file://")){
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string path = new Uri(uri).LocalPath;
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return File.ReadAllBytes(path);
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}
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// Setup request headers
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HttpRequestMessage request = new HttpRequestMessage(HttpMethod.Get, uri);
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foreach (var header in headers){
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request.Headers.TryAddWithoutValidation(header.Key, header.Value);
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}
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// Set default user-agent if not provided
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if (!request.Headers.Contains("User-Agent")){
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request.Headers.Add("User-Agent", "Mozilla/5.0 (Windows NT 10.0; WOW64; rv:70.0) Gecko/20100101 Firefox/70.0");
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}
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return await SendRequestWithRetry(request, partIndex, segOffset, isKey, retryCount);
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}
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private async Task<byte[]?> SendRequestWithRetry(HttpRequestMessage requestPara, int partIndex, int segOffset, bool isKey, int retryCount){
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HttpResponseMessage response;
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for (int attempt = 0; attempt < retryCount + 1; attempt++){
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using (var request = CloneHttpRequestMessage(requestPara)){
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try{
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response = await HttpClientReq.Instance.GetHttpClient().SendAsync(request, HttpCompletionOption.ResponseContentRead);
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response.EnsureSuccessStatusCode();
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return await ReadContentAsByteArrayAsync(response.Content);
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} catch (HttpRequestException ex){
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// Log retry attempts
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string partType = isKey ? "Key" : "Part";
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int partIndx = partIndex + 1 + segOffset;
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Console.WriteLine($"{partType} {partIndx}: Attempt {attempt + 1} to retrieve data failed.");
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Console.WriteLine($"\tError: {ex.Message}");
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if (attempt == retryCount)
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throw; // rethrow after last retry
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}
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}
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}
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return null; // Should not reach here
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}
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private async Task<byte[]> ReadContentAsByteArrayAsync(HttpContent content){
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using (var memoryStream = new MemoryStream())
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using (var contentStream = await content.ReadAsStreamAsync()){
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await contentStream.CopyToAsync(memoryStream, 81920);
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return memoryStream.ToArray();
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}
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}
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private HttpRequestMessage CloneHttpRequestMessage(HttpRequestMessage originalRequest){
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var clone = new HttpRequestMessage(originalRequest.Method, originalRequest.RequestUri){
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Content = originalRequest.Content?.Clone(),
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Version = originalRequest.Version
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};
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foreach (var header in originalRequest.Headers){
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clone.Headers.TryAddWithoutValidation(header.Key, header.Value);
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}
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foreach (var property in originalRequest.Properties){
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clone.Properties.Add(property);
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}
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return clone;
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}
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private static string GetUri(string uri, string? baseUrl = null){
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bool httpUri = Regex.IsMatch(uri, @"^https?:", RegexOptions.IgnoreCase);
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if (string.IsNullOrEmpty(baseUrl) && !httpUri){
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throw new ArgumentException("No base and not http(s) uri");
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} else if (httpUri){
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return uri;
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}
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return baseUrl + uri;
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}
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}
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public static class HttpContentExtensions{
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public static HttpContent Clone(this HttpContent content){
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if (content == null) return null;
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var memStream = new MemoryStream();
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content.CopyToAsync(memStream).Wait();
|
|
memStream.Position = 0;
|
|
var newContent = new StreamContent(memStream);
|
|
foreach (var header in content.Headers){
|
|
newContent.Headers.Add(header.Key, header.Value);
|
|
}
|
|
|
|
return newContent;
|
|
}
|
|
}
|
|
|
|
public class Info{
|
|
public int Percent{ get; set; }
|
|
public double Time{ get; set; } // Remaining time estimate
|
|
public double DownloadSpeed{ get; set; } // Bytes per second
|
|
}
|
|
|
|
public class ResumeData{
|
|
public int Total{ get; set; }
|
|
public int Completed{ get; set; }
|
|
}
|
|
|
|
public class M3U8Json{
|
|
public dynamic Segments{ get; set; } = new List<dynamic>();
|
|
public int? MediaSequence{ get; set; }
|
|
}
|
|
|
|
public class Segment{
|
|
public string? Uri{ get; set; }
|
|
public Key? Key{ get; set; }
|
|
public ByteRange? ByteRange{ get; set; }
|
|
}
|
|
|
|
public class Key{
|
|
public string? Uri{ get; set; }
|
|
public List<int> Iv{ get; set; } = new List<int>();
|
|
}
|
|
|
|
public class ByteRange{
|
|
public long Offset{ get; set; }
|
|
public long Length{ get; set; }
|
|
|
|
public IDictionary<string, string> ToDictionary(){
|
|
return new Dictionary<string, string>{
|
|
{ "Offset", Offset.ToString() },
|
|
{ "Length", Length.ToString() }
|
|
};
|
|
}
|
|
}
|
|
|
|
public class HlsOptions{
|
|
public M3U8Json? M3U8Json{ get; set; }
|
|
public string? Output{ get; set; }
|
|
public int? Threads{ get; set; }
|
|
public int? Retries{ get; set; }
|
|
public int? Offset{ get; set; }
|
|
public string? BaseUrl{ get; set; }
|
|
public bool? SkipInit{ get; set; }
|
|
public int? Timeout{ get; set; }
|
|
public int? FsRetryTime{ get; set; }
|
|
public string? Override{ get; set; }
|
|
}
|
|
|
|
public class Data{
|
|
public PartsData Parts{ get; set; } = new PartsData();
|
|
public M3U8Json? M3U8Json{ get; set; }
|
|
public string? OutputFile{ get; set; }
|
|
public int Threads{ get; set; }
|
|
public int Retries{ get; set; }
|
|
public int Offset{ get; set; }
|
|
public string? BaseUrl{ get; set; }
|
|
public bool SkipInit{ get; set; }
|
|
public Dictionary<string, byte[]> Keys{ get; set; } = new Dictionary<string, byte[]>(); // Object can be Buffer or string
|
|
public int Timeout{ get; set; }
|
|
public bool CheckPartLength{ get; set; }
|
|
public bool IsResume{ get; set; }
|
|
public long BytesDownloaded{ get; set; }
|
|
public int WaitTime{ get; set; }
|
|
public string? Override{ get; set; }
|
|
public long DateStart{ get; set; }
|
|
}
|
|
|
|
public class ProgressData{
|
|
public int Total{ get; set; }
|
|
|
|
public int Cur{ get; set; }
|
|
|
|
// Considering the dual type in TypeScript (number|string), you might opt for string in C# to accommodate both numeric and text representations.
|
|
// Alternatively, you could use a custom setter to handle numeric inputs as strings, or define two separate properties if the usage context is clear.
|
|
public string? Percent{ get; set; }
|
|
public double Time{ get; set; } // Assuming this represents a duration or timestamp, you might consider TimeSpan or DateTime based on context.
|
|
public double DownloadSpeed{ get; set; }
|
|
public long Bytes{ get; set; }
|
|
}
|
|
|
|
public class DownloadInfo{
|
|
public string? Image{ get; set; }
|
|
|
|
public Parent? Parent{ get; set; }
|
|
public string? Title{ get; set; }
|
|
public LanguageItem? Language{ get; set; }
|
|
public string? FileName{ get; set; }
|
|
}
|
|
|
|
public class Parent{
|
|
public string? Title{ get; set; }
|
|
}
|
|
|
|
public class PartsData{
|
|
public int First{ get; set; }
|
|
public int Total{ get; set; }
|
|
public int Completed{ get; set; }
|
|
} |