fn read_infe()

in mp4parse/src/lib.rs [2884:2922]

• 33 lines of code
• 3 McCabe index (conditional complexity)

fn read_infe<T: Read>(
    src: &mut BMFFBox<T>,
    strictness: ParseStrictness,
    unsupported_features: &mut UnsupportedFeatures,
) -> Result<Option<ItemInfoEntry>> {
    let (version, flags) = read_fullbox_extra(src)?;

    // According to the standard, it seems the flags field shall be 0, but at
    // least one sample AVIF image has a nonzero value.
    // See https://github.com/AOMediaCodec/av1-avif/issues/146
    if flags != 0 {
        fail_with_status_if(
            strictness == ParseStrictness::Strict,
            Status::InfeFlagsNonzero,
        )?;
    }

    // mif1 brand (see HEIF (ISO 23008-12:2017) § 10.2.1) only requires v2 and 3
    let item_id = ItemId(match version {
        2 => be_u16(src)?.into(),
        3 => be_u32(src)?,
        _ => return Err(Error::Unsupported("unsupported version in 'infe' box")),
    });

    let item_protection_index = be_u16(src)?;

    let item_type = be_u32(src)?;
    debug!("infe {:?} item_type: {}", item_id, U32BE(item_type));

    // There are some additional fields here, but they're not of interest to us
    skip_box_remain(src)?;

    if item_protection_index != 0 {
        unsupported_features.insert(Feature::Ipro);
        Ok(None)
    } else {
        Ok(Some(ItemInfoEntry { item_id, item_type }))
    }
}