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avcodec/ffv1: Store remap flag per slice

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This allows switching it on conditionally and also for non float,
it may improve compression for RGB data that was paletted
or other synthetic images

Sponsored-by: Sovereign Tech Fund
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer
2025-01-18 21:51:27 +01:00
parent 4a0c285dfe
commit 9bad2634ee
5 changed files with 16 additions and 4 deletions
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8
libavcodec/ffv1dec.c
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@@ -220,6 +220,14 @@ static int decode_slice_header(const FFV1Context *f,
return AVERROR_INVALIDDATA;
}
}
if (f->combined_version >= 0x40004) {
sc->remap = ff_ffv1_get_symbol(c, state, 0);
if (sc->remap > 1U ||
sc->remap == 1 && !f->flt) {
av_log(f->avctx, AV_LOG_ERROR, "unsupported remap %d\n", sc->remap);
return AVERROR_INVALIDDATA;
}
}
}
return 0;