fn get_indice_table()

in mp4parse_capi/src/lib.rs [1370:1414]

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

fn get_indice_table(
    context: &MediaContext,
    sample_table_cache: &mut TryHashMap<u32, TryVec<Indice>>,
    track_id: u32,
    indices: &mut Mp4parseByteData,
) -> Result<(), Mp4parseStatus> {
    let tracks = &context.tracks;
    let track = match tracks.iter().find(|track| track.track_id == Some(track_id)) {
        Some(t) => t,
        _ => return Err(Mp4parseStatus::Invalid),
    };

    if let Some(v) = sample_table_cache.get(&track_id) {
        indices.set_indices(v);
        return Ok(());
    }

    let media_time = match &track.media_time {
        &Some(t) => i64::try_from(t.0).ok().map(Into::into),
        _ => None,
    };

    let empty_duration: Option<CheckedInteger<_>> = match &track.empty_duration {
        &Some(e) => i64::try_from(e.0).ok().map(Into::into),
        _ => None,
    };

    // Find the track start offset time from 'elst'.
    // 'media_time' maps start time onward, 'empty_duration' adds time offset
    // before first frame is displayed.
    let offset_time = match (empty_duration, media_time) {
        (Some(e), Some(m)) => (e - m).ok_or(Err(Mp4parseStatus::Invalid))?,
        (Some(e), None) => e,
        (None, Some(m)) => m,
        _ => 0.into(),
    };

    if let Some(v) = create_sample_table(track, offset_time) {
        indices.set_indices(&v);
        sample_table_cache.insert(track_id, v)?;
        return Ok(());
    }

    Err(Mp4parseStatus::Invalid)
}