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avcodec/mpeg4videodec: Don't initialize unused stuff

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Only the intra scantable is used for studio profile.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
This commit is contained in:
Andreas Rheinhardt 2024-06-07 22:43:10 +02:00
parent d197a8d6b6
commit 7bccf63de5
1 changed files with 2 additions and 15 deletions
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17
libavcodec/mpeg4videodec.c
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@ -3430,21 +3430,8 @@ static int decode_studio_vop_header(Mpeg4DecContext *ctx, GetBitContext *gb)
s->q_scale_type = get_bits1(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);
ff_permute_scantable(s->permutated_intra_h_scantable, ff_alternate_vertical_scan,
s->idsp.idct_permutation);
ff_permute_scantable(s->permutated_intra_v_scantable, ff_alternate_vertical_scan,
s->idsp.idct_permutation);
} 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);
ff_permute_scantable(s->permutated_intra_h_scantable, ff_alternate_horizontal_scan,
s->idsp.idct_permutation);
ff_permute_scantable(s->permutated_intra_v_scantable, ff_alternate_vertical_scan,
s->idsp.idct_permutation);
}
ff_init_scantable(s->idsp.idct_permutation, &s->intra_scantable,
s->alternate_scan ? ff_alternate_vertical_scan : ff_zigzag_direct);
mpeg4_load_default_matrices(s);