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Try to skip extended header in MetaBox. #111

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Merged
alfg merged 2 commits into from
Jul 29, 2023
Merged

Try to skip extended header in MetaBox. #111

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55ee392
Try to skip extended header in MetaBox.
w-flo Jun 29, 2023
21c92ee
Merge branch 'master' into skip_extended_meta_header
alfg Jul 29, 2023
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16 changes: 13 additions & 3 deletions src/mp4box/meta.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -90,9 +90,19 @@ 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 mut current = reader.stream_position()?;
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