ID3v2 popularimeter is not populated

[maneac]

Reproducer

Rust version: v1.63.0 stable

cargo.toml:

[package]
name = "lofty-id3-pop"
version = "0.1.0"
edition = "2021"

[dependencies]
lofty = "0.8.0"

src/main.rs:

fn main() {
    // Contents of the file
    let mut example_bytes = vec![
        // ID3 header - https://id3.org/id3v2.4.0-structure section 3
        b'I', b'D', b'3', 0x04, 0x00, 0b00000000, 0, 0, 0, 118,
        // ID3 POPM frame - https://en.wikipedia.org/wiki/ID3#ID3v2_star_rating_tag_issue
        b'P', b'O', b'P', b'M', 0, 0, 0, 35, 0x00, 0x00, b'W', b'i', b'n', b'd', b'o', b'w', b's',
        b' ', b'M', b'e', b'd', b'i', b'a', b' ', b'P', b'l', b'a', b'y', b'e', b'r', b' ', b'9',
        b' ', b'S', b'e', b'r', b'i', b'e', b's', 0x00, 196, 0x00, 0x00, 0x00, 0x00,
    ];
    // Pad to at least 128 bytes to support the negative seek during ID3v1 header parsing
    // - https://github.com/Serial-ATA/lofty-rs/tree/1b546700d552caeb970a1751862b8b5a2585fe9c/src/mpeg/read.rs#L100
    // - https://github.com/Serial-ATA/lofty-rs/tree/1b546700d552caeb970a1751862b8b5a2585fe9c/src/id3/mod.rs#L54
    example_bytes.append(&mut vec![0u8; 128 - 55]);

    // Write the file to disk
    let path = std::env::temp_dir().join("minimal_example.mp3");
    std::fs::write(&path, example_bytes).unwrap();

    // Parse the file for ID3 tags
    let info = lofty::read_from_path(&path, false).unwrap();
    for tag in info.tags() {
        if let Some(pop) = tag.get_string(&lofty::ItemKey::Popularimeter) {
            println!("Found popularimeter: {pop}");
            return;
        }
    }
    panic!("No popularimeter tag found");
}

Summary

When parsing files with ID3v2 tags, such as MP3s, the Popularimeter tag is never populated.

Expected behavior

Using the supplied example:

Expected:

> cargo run
Found popularimeter: 196

Actual:

> cargo run
thread 'main' panicked at 'No popularimeter tag found', src/main.rs:28:5

Assets

No response