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Try to skip extended header in MetaBox.

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Fixes #102
This commit is contained in:
Florian Will 2023-06-29 16:49:35 +02:00
parent 55875d72de
commit 55ee392b73
1 changed files with 13 additions and 3 deletions
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16
src/mp4box/meta.rs
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@ -84,9 +84,19 @@ impl<R: Read + Seek> ReadBox<&mut R> for MetaBox {
fn read_box(reader: &mut R, size: u64) -> Result<Self> {
let start = box_start(reader)?;
let (version, _) = read_box_header_ext(reader)?;
if version != 0 {
return Err(Error::UnsupportedBoxVersion(BoxType::UdtaBox, version));
let extended_header = reader.read_u32::<BigEndian>()?;
if extended_header != 0 {
// ISO mp4 requires this header (version & flags) to be 0. Some
// files skip the extended header and directly start the hdlr box.
let possible_hdlr = BoxType::from(reader.read_u32::<BigEndian>()?);
if possible_hdlr == BoxType::HdlrBox {
// This file skipped the extended header! Go back to start.
reader.seek(SeekFrom::Current(-8))?;
} else {
// Looks like we actually have a bad version number or flags.
let v = (extended_header >> 24) as u8;
return Err(Error::UnsupportedBoxVersion(BoxType::MetaBox, v));
}
}
let hdlr_header = BoxHeader::read(reader)?;