From 5b88660518c376a1810c7d69eee3cc40ea781799 Mon Sep 17 00:00:00 2001
From: nilaoda <nilaoda@live.com>
Date: Sat, 29 Oct 2022 17:36:17 +0800
Subject: [PATCH] =?UTF-8?q?=E4=BC=98=E5=8C=96`cenc`=E7=9A=84`KID`=E8=AF=BB?=
=?UTF-8?q?=E5=8F=96?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
---
src/N_m3u8DL-RE.Parser/Mp4/MP4InitUtil.cs | 19 ++++++++++++++++++-
1 file changed, 18 insertions(+), 1 deletion(-)
diff --git a/src/N_m3u8DL-RE.Parser/Mp4/MP4InitUtil.cs b/src/N_m3u8DL-RE.Parser/Mp4/MP4InitUtil.cs
index e8dd1d3..148f850 100644
--- a/src/N_m3u8DL-RE.Parser/Mp4/MP4InitUtil.cs
+++ b/src/N_m3u8DL-RE.Parser/Mp4/MP4InitUtil.cs
@@ -50,7 +50,6 @@ namespace Mp4SubtitleParser
private static void ReadBox(byte[] data, ParsedMP4Info info)
{
- info.KID = HexUtil.BytesToHex(data[^16..]).ToLower();
//find schm
var schmBytes = new byte[4] { 0x73, 0x63, 0x68, 0x6d };
var schmIndex = 0;
@@ -66,6 +65,24 @@ namespace Mp4SubtitleParser
{
info.Scheme = System.Text.Encoding.UTF8.GetString(data[schmIndex..][8..12]);
}
+
+ if (info.Scheme != "cenc") return;
+
+ //find KID
+ var tencBytes = new byte[4] { 0x74, 0x65, 0x6E, 0x63 };
+ var tencIndex = 0;
+ for (int i = 0; i < data.Length - 4; i++)
+ {
+ if (new byte[4] { data[i], data[i + 1], data[i + 2], data[i + 3] }.SequenceEqual(tencBytes))
+ {
+ tencIndex = i;
+ break;
+ }
+ }
+ if (tencIndex + 12 < data.Length)
+ {
+ info.KID = HexUtil.BytesToHex(data[tencIndex..][12..28]).ToLower();
+ }
}
}
}