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My preliminary thoughts on OpenJPEG

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This commit is contained in:
Siana Gearz
2013-01-06 02:38:12 +01:00
parent 20ae72e5fa
commit d5892bbb32
3 changed files with 52 additions and 30 deletions
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19
indra/libopenjpeg/t1.c
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@@ -1091,14 +1091,27 @@ static double t1_getwmsedec(
int numcomps,
int mct)
{
double w1, w2, wmsedec;
double w1 = 1, w2, wmsedec;
// Prevent running an MCT on more than 3 components. NB openjpeg v2.0 will support this via
// custom MCT tables that can be passed as encode parameters, 1.3 cannot support this as it
// uses a static table of 3 entries and there for can only cope with 3 components with out an
// array overflow
if(numcomps==3) {
if (qmfbid == 1) {
w1 = (numcomps > 1) ? mct_getnorm(compno) : 1.0;
} else {
w1 = (numcomps > 1) ? mct_getnorm_real(compno) : 1.0;
}
}
if (qmfbid == 1) {
w1 = (mct && numcomps==3) ? mct_getnorm(compno) : 1.0;
w2 = dwt_getnorm(level, orient);
} else { /* if (qmfbid == 0) */
w1 = (mct && numcomps==3) ? mct_getnorm_real(compno) : 1.0;
w2 = dwt_getnorm_real(level, orient);
}
wmsedec = w1 * w2 * stepsize * (1 << bpno);
wmsedec *= wmsedec * nmsedec / 8192.0;