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ljpegdec: support non zero MCU for RGB. 2nd try

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Fixes Ticket875
Compared to patch 1 this fixes a bright line at the right side.

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2012-01-06 19:03:21 +01:00
parent 9997d41672
commit bbe25b4f3e
1 changed files with 12 additions and 2 deletions
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14
libavcodec/mjpegdec.c
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@ -684,6 +684,8 @@ static int ljpeg_decode_rgb_scan(MJpegDecodeContext *s, int nb_components, int p
int left[3], top[3], topleft[3];
const int linesize= s->linesize[0];
const int mask= (1<<s->bits)-1;
int resync_mb_y = 0;
int resync_mb_x = 0;
av_fast_malloc(&s->ljpeg_buffer, &s->ljpeg_buffer_size, (unsigned)s->mb_width * 4 * sizeof(s->ljpeg_buffer[0][0]));
buffer= s->ljpeg_buffer;
@ -692,7 +694,6 @@ static int ljpeg_decode_rgb_scan(MJpegDecodeContext *s, int nb_components, int p
buffer[0][i]= 1 << (s->bits - 1);
}
for(mb_y = 0; mb_y < s->mb_height; mb_y++) {
const int modified_predictor= mb_y ? predictor : 1;
uint8_t *ptr = s->picture.data[0] + (linesize * mb_y);
if (s->interlaced && s->bottom_field)
@ -702,8 +703,17 @@ static int ljpeg_decode_rgb_scan(MJpegDecodeContext *s, int nb_components, int p
top[i]= left[i]= topleft[i]= buffer[0][i];
}
for(mb_x = 0; mb_x < s->mb_width; mb_x++) {
if (s->restart_interval && !s->restart_count)
int modified_predictor = predictor;
if (s->restart_interval && !s->restart_count){
s->restart_count = s->restart_interval;
resync_mb_x = mb_x;
resync_mb_y = mb_y;
for(i=0; i<3; i++)
top[i]= left[i]= topleft[i]= 1 << (s->bits - 1);
}
if (mb_y == resync_mb_y || mb_y == resync_mb_y+1 && mb_x < resync_mb_x)
modified_predictor = 1;
for(i=0;i<nb_components;i++) {
int pred, dc;