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libopenjpegdec.c: Correctly scale gray16 output if precision < 16

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Fixes ticket #2943.

Signed-off-by: Carl Eugen Hoyos <cehoyos@ag.or.at>
This commit is contained in:
Michael Bradshaw
2013-09-12 09:21:51 +02:00
committed by Carl Eugen Hoyos
parent d73565d5dd
commit 7412a4a48f
1 changed files with 5 additions and 1 deletions
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6
libavcodec/libopenjpegdec.c
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@@ -207,12 +207,16 @@ static inline void libopenjpeg_copyto16(AVFrame *picture, opj_image_t *image) {
int *comp_data;
uint16_t *img_ptr;
int index, x, y;
int adjust[4];
for (x = 0; x < image->numcomps; x++)
adjust[x] = FFMAX(FFMIN(16 - image->comps[x].prec, 8), 0);
for (index = 0; index < image->numcomps; index++) {
comp_data = image->comps[index].data;
for (y = 0; y < image->comps[index].h; y++) {
img_ptr = (uint16_t*) (picture->data[index] + y * picture->linesize[index]);
for (x = 0; x < image->comps[index].w; x++) {
*img_ptr = *comp_data;
*img_ptr = *comp_data << adjust[index];
img_ptr++;
comp_data++;
}