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avcodec/jpeg2000dwt: Fix 9/7 IDWT for small sizes 

Fixes Ticket4631

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2015-06-16 20:33:54 +02:00
parent 8294ec67b5
commit 34121ca187
1 changed files with 8 additions and 2 deletions
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10
libavcodec/jpeg2000dwt.c
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@ -357,8 +357,11 @@ static void sr_1d97_float(float *p, int i0, int i1)
{
int i;
if (i1 == i0 + 1)
if (i1 <= i0 + 1) {
if (i0 == 1)
p[1] *= F_LFTG_K/2;
return;
}
extend97_float(p, i0, i1);
@ -429,8 +432,11 @@ static void sr_1d97_int(int32_t *p, int i0, int i1)
{
int i;
if (i1 == i0 + 1)
if (i1 <= i0 + 1) {
if (i0 == 1)
p[1] = (p[1] * I_LFTG_K + (1<<16)) >> 17;
return;
}
extend97_int(p, i0, i1);