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Irreversible decoding: partially revert previous commit, to fix failures in test suite

This commit is contained in:
Even Rouault 2020-05-20 19:24:09 +02:00
parent 3cd1305596
commit adccbc8336
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2 changed files with 15 additions and 3 deletions
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12
src/lib/openjp2/dwt.c
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@ -2608,6 +2608,14 @@ static void opj_v4dwt_decode_step2(opj_v4_t* l, opj_v4_t* w,
static void opj_v4dwt_decode(opj_v4dwt_t* OPJ_RESTRICT dwt)
{
OPJ_INT32 a, b;
/* BUG_WEIRD_TWO_INVK (look for this identifier in tcd.c) */
/* Historic value for 2 / opj_invK */
/* Normally, we should use invK, but if we do so, we have failures in the */
/* conformance test, due to MSE and peak errors significantly higher than */
/* accepted value */
/* Due to using two_invK instead of invK, we have to compensate in tcd.c */
/* the computation of the stepsize for the non LL subbands */
const float two_invK = 1.625732422f;
if (dwt->cas == 0) {
if (!((dwt->dn > 0) || (dwt->sn > 1))) {
return;
@ -2625,7 +2633,7 @@ static void opj_v4dwt_decode(opj_v4dwt_t* OPJ_RESTRICT dwt)
opj_v4dwt_decode_step1_sse(dwt->wavelet + a, dwt->win_l_x0, dwt->win_l_x1,
_mm_set1_ps(opj_K));
opj_v4dwt_decode_step1_sse(dwt->wavelet + b, dwt->win_h_x0, dwt->win_h_x1,
_mm_set1_ps(opj_invK));
_mm_set1_ps(two_invK));
opj_v4dwt_decode_step2_sse(dwt->wavelet + b, dwt->wavelet + a + 1,
dwt->win_l_x0, dwt->win_l_x1,
(OPJ_UINT32)opj_int_min(dwt->sn, dwt->dn - a),
@ -2646,7 +2654,7 @@ static void opj_v4dwt_decode(opj_v4dwt_t* OPJ_RESTRICT dwt)
opj_v4dwt_decode_step1(dwt->wavelet + a, dwt->win_l_x0, dwt->win_l_x1,
opj_K);
opj_v4dwt_decode_step1(dwt->wavelet + b, dwt->win_h_x0, dwt->win_h_x1,
opj_invK);
two_invK);
opj_v4dwt_decode_step2(dwt->wavelet + b, dwt->wavelet + a + 1,
dwt->win_l_x0, dwt->win_l_x1,
(OPJ_UINT32)opj_int_min(dwt->sn, dwt->dn - a),

6
src/lib/openjp2/tcd.c
View File

@ -1000,7 +1000,11 @@ static INLINE OPJ_BOOL opj_tcd_init_tile(opj_tcd_t *p_tcd, OPJ_UINT32 p_tile_no,
{
/* Table E-1 - Sub-band gains */
const OPJ_INT32 log2_gain = (l_band->bandno == 0) ? 0 :
/* BUG_WEIRD_TWO_INVK (look for this identifier in dwt.c): */
/* the test (!isEncoder && l_tccp->qmfbid == 0) is strongly */
/* linked to the use of two_invK instead of invK */
const OPJ_INT32 log2_gain = (!isEncoder &&
l_tccp->qmfbid == 0) ? 0 : (l_band->bandno == 0) ? 0 :
(l_band->bandno == 3) ? 2 : 1;
/* Nominal dynamic range. Equation E-4 */