From: Kostya Shishkov <kostya.shishkov@gmail.com>
Date: Thu, 13 Jan 2022 17:29:11 +0000 (+0100)
Subject: ignore MusicMatch tag
X-Git-Url: https://git.nihav.org/?a=commitdiff_plain;h=62379cdcd0f60f1f28bb4fb50bd99120db987b3c;p=nihav-tool.git

ignore MusicMatch tag
---

diff --git a/src/demux.rs b/src/demux.rs
index bf8a072..0786275 100644
--- a/src/demux.rs
+++ b/src/demux.rs
@@ -370,6 +370,27 @@ pub fn detect_tags(br: &mut ByteReader) -> (bool, u64, Option<u64>) {
             end = Some(off - size);
         }
     }
+    // check for MusicMatch tag
+    let ret = if let Some(endpos) = end {
+            br.seek(SeekFrom::Start(endpos - 0x30))
+        } else {
+            br.seek(SeekFrom::End(-0x30))
+        };
+    if ret.is_ok() && br.tell() > (0x2000 - 0x30) {
+        let mut buf = [0; 19];
+        br.peek_buf(&mut buf).unwrap();
+        if &buf == b"Brava Software Inc." {
+            br.seek(SeekFrom::Current(-20)).unwrap();
+            let mut mm_start = u64::from(br.read_u32le().unwrap());
+            if mm_start > 4 && mm_start + 0x2000 <= br.tell() {
+                let diff = (br.tell() - mm_start) & 3;
+                if diff != 0 {
+                    mm_start -= 4 - diff;
+                }
+                end = Some(mm_start);
+            }
+        }
+    }
 
     (is_raw, start, end)
 }