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Code Issues Releases Activity

avcodec/vc1_block: Stop setting write-only block_last_index

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It is only used by the mpegvideo unquantize functions which
this decoder does not use at all.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
This commit is contained in:
Andreas Rheinhardt
2025-03-07 02:06:40 +01:00
parent 594b97e433
commit 1a564c1aff
1 changed files with 9 additions and 23 deletions
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32
libavcodec/vc1_block.c
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@ -585,7 +585,6 @@ static int vc1_decode_i_block(VC1Context *v, int16_t block[64], int n,
GetBitContext *gb = &v->s.gb;
MpegEncContext *s = &v->s;
int dc_pred_dir = 0; /* Direction of the DC prediction used */
int i;
int16_t *dc_val;
int16_t *ac_val, *ac_val2;
int dcdiff, scale;
@ -622,7 +621,6 @@ static int vc1_decode_i_block(VC1Context *v, int16_t block[64], int n,
scale = v->pq * 2 + v->halfpq;
//AC Decoding
i = !!coded;
if (coded) {
int last = 0, skip, value;
@ -637,14 +635,14 @@ static int vc1_decode_i_block(VC1Context *v, int16_t block[64], int n,
} else
zz_table = v->zz_8x8[1];
while (!last) {
for (int i = 1; !last; ++i) {
int ret = vc1_decode_ac_coeff(v, &last, &skip, &value, codingset);
if (ret < 0)
return ret;
i += skip;
if (i > 63)
break;
block[zz_table[i++]] = value;
block[zz_table[i]] = value;
}
/* apply AC prediction if needed */
@ -696,8 +694,6 @@ static int vc1_decode_i_block(VC1Context *v, int16_t block[64], int n,
}
}
}
if (s->ac_pred) i = 63;
s->block_last_index[n] = i;
return 0;
}
@ -716,7 +712,6 @@ static int vc1_decode_i_block_adv(VC1Context *v, int16_t block[64], int n,
GetBitContext *gb = &v->s.gb;
MpegEncContext *s = &v->s;
int dc_pred_dir = 0; /* Direction of the DC prediction used */
int i;
int16_t *dc_val = NULL;
int16_t *ac_val, *ac_val2;
int dcdiff;
@ -778,7 +773,6 @@ static int vc1_decode_i_block_adv(VC1Context *v, int16_t block[64], int n,
}
//AC Decoding
i = 1;
if (coded) {
int last = 0, skip, value;
@ -801,14 +795,14 @@ static int vc1_decode_i_block_adv(VC1Context *v, int16_t block[64], int n,
zz_table = v->zzi_8x8;
}
while (!last) {
for (int i = 1; !last; ++i) {
int ret = vc1_decode_ac_coeff(v, &last, &skip, &value, codingset);
if (ret < 0)
return ret;
i += skip;
if (i > 63)
break;
block[zz_table[i++]] = value;
block[zz_table[i]] = value;
}
/* apply AC prediction if needed */
@ -880,8 +874,6 @@ static int vc1_decode_i_block_adv(VC1Context *v, int16_t block[64], int n,
}
}
}
if (use_pred) i = 63;
s->block_last_index[n] = i;
return 0;
}
@ -900,7 +892,6 @@ static int vc1_decode_intra_block(VC1Context *v, int16_t block[64], int n,
GetBitContext *gb = &v->s.gb;
MpegEncContext *s = &v->s;
int dc_pred_dir = 0; /* Direction of the DC prediction used */
int i;
int16_t *dc_val = NULL;
int16_t *ac_val, *ac_val2;
int dcdiff;
@ -942,7 +933,6 @@ static int vc1_decode_intra_block(VC1Context *v, int16_t block[64], int n,
block[0] = dcdiff * s->y_dc_scale;
//AC Decoding
i = 1;
/* check if AC is needed at all and adjust direction if needed */
if (!a_avail) dc_pred_dir = 1;
@ -973,7 +963,7 @@ static int vc1_decode_intra_block(VC1Context *v, int16_t block[64], int n,
int last = 0, skip, value;
int k;
while (!last) {
for (int i = 1; !last; ++i) {
int ret = vc1_decode_ac_coeff(v, &last, &skip, &value, codingset);
if (ret < 0)
return ret;
@ -981,15 +971,15 @@ static int vc1_decode_intra_block(VC1Context *v, int16_t block[64], int n,
if (i > 63)
break;
if (v->fcm == PROGRESSIVE)
block[v->zz_8x8[0][i++]] = value;
block[v->zz_8x8[0][i]] = value;
else {
if (use_pred && (v->fcm == ILACE_FRAME)) {
if (!dc_pred_dir) // top
block[v->zz_8x8[2][i++]] = value;
block[v->zz_8x8[2][i]] = value;
else // left
block[v->zz_8x8[3][i++]] = value;
block[v->zz_8x8[3][i]] = value;
} else {
block[v->zzi_8x8[i++]] = value;
block[v->zzi_8x8[i]] = value;
}
}
}
@ -1033,8 +1023,6 @@ static int vc1_decode_intra_block(VC1Context *v, int16_t block[64], int n,
if (!v->pquantizer)
block[k] += (block[k] < 0) ? -quant : quant;
}
if (use_pred) i = 63;
} else { // no AC coeffs
int k;
@ -1082,10 +1070,8 @@ static int vc1_decode_intra_block(VC1Context *v, int16_t block[64], int n,
block[k << v->top_blk_sh] += (block[k << v->top_blk_sh] < 0) ? -quant : quant;
}
}
i = 63;
}
}
s->block_last_index[n] = i;
return 0;
}