123 lines
4.1 KiB
C#
123 lines
4.1 KiB
C#
using AAXClean;
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using Dinah.Core.IO;
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using Dinah.Core.Net.Http;
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using Dinah.Core.StepRunner;
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using System;
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using System.IO;
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namespace AaxDecrypter
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{
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public class AaxcDownloadConverter : AudiobookDownloadBase
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{
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protected override StepSequence steps { get; }
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private AaxFile aaxFile;
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private OutputFormat OutputFormat { get; }
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public AaxcDownloadConverter(string outFileName, string cacheDirectory, DownloadLicense dlLic, OutputFormat outputFormat)
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:base(outFileName, cacheDirectory, dlLic)
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{
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OutputFormat = outputFormat;
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steps = new StepSequence
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{
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Name = "Download and Convert Aaxc To " + OutputFormat,
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["Step 1: Get Aaxc Metadata"] = Step1_GetMetadata,
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["Step 2: Download Decrypted Audiobook"] = Step2_DownloadAudiobook,
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["Step 3: Create Cue"] = Step3_CreateCue,
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["Step 4: Cleanup"] = Step4_Cleanup,
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};
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}
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/// <summary>
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/// Setting cover art by this method will insert the art into the audiobook metadata
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/// </summary>
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public override void SetCoverArt(byte[] coverArt)
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{
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base.SetCoverArt(coverArt);
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aaxFile?.AppleTags.SetCoverArt(coverArt);
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}
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protected override bool Step1_GetMetadata()
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{
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aaxFile = new AaxFile(InputFileStream);
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OnRetrievedTitle(aaxFile.AppleTags.TitleSansUnabridged);
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OnRetrievedAuthors(aaxFile.AppleTags.FirstAuthor ?? "[unknown]");
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OnRetrievedNarrators(aaxFile.AppleTags.Narrator ?? "[unknown]");
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OnRetrievedCoverArt(aaxFile.AppleTags.Cover);
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return !isCanceled;
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}
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protected override bool Step2_DownloadAudiobook()
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{
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var zeroProgress = new DownloadProgress
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{
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BytesReceived = 0,
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ProgressPercentage = 0,
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TotalBytesToReceive = InputFileStream.Length
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};
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OnDecryptProgressUpdate(zeroProgress);
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aaxFile.SetDecryptionKey(downloadLicense.AudibleKey, downloadLicense.AudibleIV);
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if (File.Exists(outputFileName))
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FileExt.SafeDelete(outputFileName);
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var outputFile = File.Open(outputFileName, FileMode.OpenOrCreate, FileAccess.ReadWrite);
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aaxFile.ConversionProgressUpdate += AaxFile_ConversionProgressUpdate;
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var decryptionResult = OutputFormat == OutputFormat.M4b ? aaxFile.ConvertToMp4a(outputFile, downloadLicense.ChapterInfo) : aaxFile.ConvertToMp3(outputFile);
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aaxFile.ConversionProgressUpdate -= AaxFile_ConversionProgressUpdate;
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aaxFile.Close();
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downloadLicense.ChapterInfo = aaxFile.Chapters;
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CloseInputFileStream();
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OnDecryptProgressUpdate(zeroProgress);
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return decryptionResult == ConversionResult.NoErrorsDetected && !isCanceled;
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}
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private void AaxFile_ConversionProgressUpdate(object sender, ConversionProgressEventArgs e)
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{
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var duration = aaxFile.Duration;
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double remainingSecsToProcess = (duration - e.ProcessPosition).TotalSeconds;
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double estTimeRemaining = remainingSecsToProcess / e.ProcessSpeed;
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if (double.IsNormal(estTimeRemaining))
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OnDecryptTimeRemaining(TimeSpan.FromSeconds(estTimeRemaining));
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double progressPercent = e.ProcessPosition.TotalSeconds / duration.TotalSeconds;
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OnDecryptProgressUpdate(
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new DownloadProgress
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{
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ProgressPercentage = 100 * progressPercent,
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BytesReceived = (long)(InputFileStream.Length * progressPercent),
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TotalBytesToReceive = InputFileStream.Length
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});
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}
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public override void Cancel()
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{
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isCanceled = true;
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aaxFile?.Cancel();
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aaxFile?.Dispose();
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CloseInputFileStream();
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}
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protected override int GetSpeedup(TimeSpan elapsed)
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=> (int)(aaxFile.Duration.TotalSeconds / (long)elapsed.TotalSeconds);
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}
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}
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