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avcodec/j2kenc: Fix undefined shifts of negative numbers

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Also add parentheses to some lines to make the operator precedence
clearer.

This affected the FATE-tests vsynth*-jpeg2000 and vsynth*-jpeg2000-97
(where * ranges over { 1, 2, 3, _lena }) as well as ticket #7983.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Andreas Rheinhardt 2020-01-21 01:23:47 +01:00 committed by Michael Niedermayer
parent c07565627b
commit 39b60359db
1 changed files with 5 additions and 5 deletions
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10
libavcodec/j2kenc.c
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@ -521,13 +521,13 @@ static void init_luts(void)
mask = ~((1<<NMSEDEC_FRACBITS)-1);
for (i = 0; i < (1 << NMSEDEC_BITS); i++){
lut_nmsedec_sig[i] = FFMAX(6*i - (9<<NMSEDEC_FRACBITS-1) << 12-NMSEDEC_FRACBITS, 0);
lut_nmsedec_sig[i] = FFMAX((3 * i << (13 - NMSEDEC_FRACBITS)) - (9 << 11), 0);
lut_nmsedec_sig0[i] = FFMAX((i*i + (1<<NMSEDEC_FRACBITS-1) & mask) << 1, 0);
a = (i >> (NMSEDEC_BITS-2)&2) + 1;
lut_nmsedec_ref[i] = FFMAX((-2*i + (1<<NMSEDEC_FRACBITS) + a*i - (a*a<<NMSEDEC_FRACBITS-2))
<< 13-NMSEDEC_FRACBITS, 0);
lut_nmsedec_ref0[i] = FFMAX(((i*i + (1-4*i << NMSEDEC_FRACBITS-1) + (1<<2*NMSEDEC_FRACBITS)) & mask)
lut_nmsedec_ref[i] = FFMAX((a - 2) * (i << (13 - NMSEDEC_FRACBITS)) +
(1 << 13) - (a * a << 11), 0);
lut_nmsedec_ref0[i] = FFMAX(((i * i - (i << NMSEDEC_BITS) + (1 << 2 * NMSEDEC_FRACBITS) + (1 << (NMSEDEC_FRACBITS - 1))) & mask)
<< 1, 0);
}
}
@ -927,7 +927,7 @@ static int encode_tile(Jpeg2000EncoderContext *s, Jpeg2000Tile *tile, int tileno
for (y = yy0; y < yy1; y++){
int *ptr = t1.data + (y-yy0)*t1.stride;
for (x = xx0; x < xx1; x++){
*ptr++ = comp->i_data[(comp->coord[0][1] - comp->coord[0][0]) * y + x] << NMSEDEC_FRACBITS;
*ptr++ = comp->i_data[(comp->coord[0][1] - comp->coord[0][0]) * y + x] * (1 << NMSEDEC_FRACBITS);
}
}
} else{