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N_m3u8DL-RE
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Merge pull request #401 from hyww/feat/webm-decrypt 

try using shaka packager, which can handle WebM, to get KID
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nilaoda 2024-06-22 16:37:50 +08:00 committed by GitHub
parent a29c8b9482 8fe77bd058
commit 54a9eda497
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GPG Key ID: B5690EEEBB952194
2 changed files with 38 additions and 0 deletions
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12
src/N_m3u8DL-RE/DownloadManager/SimpleDownloadManager.cs
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@ -168,6 +168,10 @@ namespace N_m3u8DL_RE.DownloadManager
if (result != null && result.Success)
{
currentKID = MP4DecryptUtil.ReadInit(result.ActualFilePath);
// try shaka packager, which can handle WebM
if (string.IsNullOrEmpty(currentKID) && DownloaderConfig.MyOptions.UseShakaPackager) {
currentKID = MP4DecryptUtil.ReadInitShaka(result.ActualFilePath, mp4decrypt);
}
//从文件读取KEY
await SearchKeyAsync(currentKID);
//实时解密
@ -236,6 +240,10 @@ namespace N_m3u8DL_RE.DownloadManager
{
currentKID = MP4DecryptUtil.ReadInit(result.ActualFilePath);
}
// try shaka packager, which can handle WebM
if (string.IsNullOrEmpty(currentKID) && DownloaderConfig.MyOptions.UseShakaPackager) {
currentKID = MP4DecryptUtil.ReadInitShaka(result.ActualFilePath, mp4decrypt);
}
//从文件读取KEY
await SearchKeyAsync(currentKID);
//实时解密
@ -577,6 +585,10 @@ namespace N_m3u8DL_RE.DownloadManager
if (mergeSuccess && totalCount >= 1 && string.IsNullOrEmpty(currentKID) && streamSpec.Playlist!.MediaParts.First().MediaSegments.First().EncryptInfo.Method != Common.Enum.EncryptMethod.NONE)
{
currentKID = MP4DecryptUtil.ReadInit(output);
// try shaka packager, which can handle WebM
if (string.IsNullOrEmpty(currentKID) && DownloaderConfig.MyOptions.UseShakaPackager) {
currentKID = MP4DecryptUtil.ReadInitShaka(output, mp4decrypt);
}
//从文件读取KEY
await SearchKeyAsync(currentKID);
}

26
src/N_m3u8DL-RE/Util/MP4DecryptUtil.cs
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@ -3,6 +3,7 @@ using N_m3u8DL_RE.Common.Log;
using N_m3u8DL_RE.Common.Resource;
using N_m3u8DL_RE.Config;
using System.Diagnostics;
using System.Text.RegularExpressions;
namespace N_m3u8DL_RE.Util
{
@ -144,5 +145,30 @@ namespace N_m3u8DL_RE.Util
return ReadInit(header);
}
}
public static string? ReadInitShaka(string output, string bin)
{
Regex ShakaKeyIDRegex = new Regex("Key for key_id=([0-9a-f]+) was not found");
// TODO: handle the case that shaka packager actually decrypted (key ID == ZeroKid)
// - stop process
// - remove {output}.tmp.webm
var cmd = $"--quiet --enable_raw_key_decryption input=\"{output}\",stream=0,output=\"{output}.tmp.webm\" " +
$"--keys key_id={ZeroKid}:key={ZeroKid}";
using var p = new Process();
p.StartInfo = new ProcessStartInfo()
{
FileName = bin,
Arguments = cmd,
RedirectStandardOutput = true,
RedirectStandardError = true,
UseShellExecute = false
};
p.Start();
var errorOutput = p.StandardError.ReadToEnd();
p.WaitForExit();
return ShakaKeyIDRegex.Match(errorOutput).Groups[1].Value;
}
}
}