Support `lsel` for decoding progressive image
Nobody has claimed this yet.
Assessment
- Difficulty
- 3/5
- Estimated time
- 1-2 days
- Newbie friendliness
- 45/100
Research direction
Start by locating mp4parse's handling of mandatory boxes and AVIF progressive-image decoding; the issue does not name a source file or test. Check the referenced layer-selector specification and updated test images, then verify that images containing an lsel box with layer_id 0xFFFF can at least be decoded non-progressively.
Written by the indexing model from the issue text.
Description
https://github.com/AOMediaCodec/av1-avif/issues/180 changed standard(https://aomediacodec.github.io/av1-avif/#layer-selector-property) to require a lsel box with layer_id set to 0xFFFF in an avif image to allow progressive decoding. Updated test images are yet to be merged: https://github.com/AOMediaCodec/av1-avif/pull/191.
With this change, mp4parse will reject any progressive image due to lsel being a mandatory unsupported box. We should at least be able to decode these images non-progressively.
I hope this can get into Firefox 102 ESR release, or we have to wait very long before being able to safely serve progressive AVIF images.
- Dominant language
- Rust
- Stars
- 448
- Forks
- 72
- Avg merge
- 20d 3h
- Merged PRs (30d)
- 1
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