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Code Issues Releases Activity

j2kdec:merge mct_decode from jpeg2000

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Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2013-05-28 22:49:57 +02:00
parent c37d735c1c
commit a510abd5d1
1 changed files with 41 additions and 7 deletions
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48
libavcodec/j2kdec.c
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@ -831,26 +831,60 @@ static void dequantization_int(int x, int y, Jpeg2000Cblk *cblk,
}
}
/* Inverse ICT parameters in float and integer.
* int value = (float value) * (1<<16) */
static const float f_ict_params[4] = {
1.402f,
0.34413f,
0.71414f,
1.772f
};
static const int i_ict_params[4] = {
91881,
22553,
46802,
116130
};
static void mct_decode(Jpeg2000DecoderContext *s, Jpeg2000Tile *tile)
{
int i, *src[3], i0, i1, i2, csize = 1;
int i, csize = 1;
int32_t *src[3], i0, i1, i2;
float *srcf[3], i0f, i1f, i2f;
for (i = 0; i < 3; i++)
src[i] = tile->comp[i].data;
if (tile->codsty[0].transform == FF_DWT97)
srcf[i] = tile->comp[i].data;
else
src[i] = (int32_t *)tile->comp[i].data;
for (i = 0; i < 2; i++)
csize *= tile->comp[0].coord[i][1] - tile->comp[0].coord[i][0];
if (tile->codsty[0].transform == FF_DWT97) {
switch (tile->codsty[0].transform) {
case FF_DWT97:
for (i = 0; i < csize; i++) {
i0 = *src[0] + (*src[2] * 46802 >> 16);
i1 = *src[0] - (*src[1] * 22553 + *src[2] * 46802 >> 16);
i2 = *src[0] + (116130 * *src[1] >> 16);
i0f = *srcf[0] + (f_ict_params[0] * *srcf[2]);
i1f = *srcf[0] - (f_ict_params[1] * *srcf[1])
- (f_ict_params[2] * *srcf[2]);
i2f = *srcf[0] + (f_ict_params[3] * *srcf[1]);
*srcf[0]++ = i0f;
*srcf[1]++ = i1f;
*srcf[2]++ = i2f;
}
break;
case FF_DWT97_INT:
for (i = 0; i < csize; i++) {
i0 = *src[0] + (((i_ict_params[0] * *src[2]) + (1 << 15)) >> 16);
i1 = *src[0] - (((i_ict_params[1] * *src[1]) + (1 << 15)) >> 16)
- (((i_ict_params[2] * *src[2]) + (1 << 15)) >> 16);
i2 = *src[0] + (((i_ict_params[3] * *src[1]) + (1 << 15)) >> 16);
*src[0]++ = i0;
*src[1]++ = i1;
*src[2]++ = i2;
}
} else{
break;
case FF_DWT53:
for (i = 0; i < csize; i++) {
i1 = *src[0] - (*src[2] + *src[1] >> 2);
i0 = i1 + *src[2];