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avcodec/mpeg12dec: Don't initialize inter_scantable

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MPEG-1/2 only needs one scantable and therefore all code
already uses the intra one. So stop initializing
the inter one altogether.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
Signed-off-by: Paul B Mahol <onemda@gmail.com>
This commit is contained in:
Andreas Rheinhardt 2024-04-28 20:56:45 +02:00 committed by Paul B Mahol
parent e8c47f8427
commit 142988b6fe
1 changed files with 4 additions and 7 deletions
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11
libavcodec/mpeg12dec.c
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@ -1256,13 +1256,10 @@ static int mpeg_decode_picture_coding_extension(Mpeg1Context *s1)
s->chroma_420_type = get_bits1(&s->gb);
s->progressive_frame = get_bits1(&s->gb);
if (s->alternate_scan) {
ff_init_scantable(s->idsp.idct_permutation, &s->inter_scantable, ff_alternate_vertical_scan);
ff_init_scantable(s->idsp.idct_permutation, &s->intra_scantable, ff_alternate_vertical_scan);
} else {
ff_init_scantable(s->idsp.idct_permutation, &s->inter_scantable, ff_zigzag_direct);
ff_init_scantable(s->idsp.idct_permutation, &s->intra_scantable, ff_zigzag_direct);
}
// We only initialize intra_scantable, as both scantables always coincide
// and all code therefore only uses the intra one.
ff_init_scantable(s->idsp.idct_permutation, &s->intra_scantable,
s->alternate_scan ? ff_alternate_vertical_scan : ff_zigzag_direct);
/* composite display not parsed */
ff_dlog(s->avctx, "intra_dc_precision=%d\n", s->intra_dc_precision);