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avcodec/vc2enc_dwt: Fix left shifts of negative numbers 

Fixes the vsynth(1|2|_lena)-vc2-(thaar|t5_3) FATE tests.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
This commit is contained in:
Andreas Rheinhardt 2022-09-27 15:19:53 +02:00
parent 3b09e8f5e9
commit 22e7e4e19d
1 changed files with 3 additions and 4 deletions
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7
libavcodec/vc2enc_dwt.c
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@ -151,7 +151,7 @@ static void vc2_subband_dwt_53(VC2TransformContext *t, dwtcoef *data,
*/
for (y = 0; y < synth_height; y++) {
for (x = 0; x < synth_width; x++)
synthl[x] = datal[x] << 1;
synthl[x] = datal[x] * 2;
synthl += synth_width;
datal += stride;
}
@ -223,9 +223,8 @@ static av_always_inline void dwt_haar(VC2TransformContext *t, dwtcoef *data,
/* Horizontal synthesis. */
for (y = 0; y < synth_height; y++) {
for (x = 0; x < synth_width; x += 2) {
synthl[y*synth_width + x + 1] = (datal[y*stride + x + 1] << s) -
(datal[y*stride + x] << s);
synthl[y*synth_width + x] = (datal[y*stride + x + 0] << s) +
synthl[y*synth_width + x + 1] = (datal[y*stride + x + 1] - datal[y*stride + x]) * (1 << s);
synthl[y*synth_width + x] = datal[y*stride + x + 0] * (1 << s) +
((synthl[y*synth_width + x + 1] + 1) >> 1);
}
}