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Code Issues Releases Activity

avcodec/vc1_block: simplify ac_val computation

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also fixes: runtime error: index 1456 out of bounds for type 'int16_t [16]'

Found-by: durandal_1707
Reviewed-by: Paul B Mahol <onemda@gmail.com>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
(cherry picked from commit d06b01fc2d)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2018-04-23 02:08:10 +02:00
parent bcc47312d4
commit 77121f6bff
1 changed files with 3 additions and 3 deletions
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6
libavcodec/vc1_block.c
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@ -594,7 +594,7 @@ static int vc1_decode_i_block(VC1Context *v, int16_t block[64], int n,
scale = s->c_dc_scale;
block[0] = dcdiff * scale;
ac_val = s->ac_val[0][0] + s->block_index[n] * 16;
ac_val = s->ac_val[0][s->block_index[n]];
ac_val2 = ac_val;
if (dc_pred_dir) // left
ac_val -= 16;
@ -745,7 +745,7 @@ static int vc1_decode_i_block_adv(VC1Context *v, int16_t block[64], int n,
scale = mquant * 2 + ((mquant == v->pq) ? v->halfpq : 0);
ac_val = s->ac_val[0][0] + s->block_index[n] * 16;
ac_val = s->ac_val[0][s->block_index[n]];
ac_val2 = ac_val;
if (dc_pred_dir) // left
ac_val -= 16;
@ -946,7 +946,7 @@ static int vc1_decode_intra_block(VC1Context *v, int16_t block[64], int n,
if (!a_avail) dc_pred_dir = 1;
if (!c_avail) dc_pred_dir = 0;
if (!a_avail && !c_avail) use_pred = 0;
ac_val = s->ac_val[0][0] + s->block_index[n] * 16;
ac_val = s->ac_val[0][s->block_index[n]];
ac_val2 = ac_val;
scale = mquant * 2 + v->halfpq;