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Code Issues Releases Activity

jpegdec: 9-16 bit yuv/gray ljpeg support.

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Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2012-01-02 17:03:24 +01:00
parent 24964f21e4
commit 465eb0eb48
1 changed files with 50 additions and 9 deletions
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59
libavcodec/mjpegdec.c
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@ -343,7 +343,10 @@ int ff_mjpeg_decode_sof(MJpegDecodeContext *s)
s->yuv442 = 1;
break;
case 0x11000000:
s->avctx->pix_fmt = PIX_FMT_GRAY8;
if(s->bits <= 8)
s->avctx->pix_fmt = PIX_FMT_GRAY8;
else
s->avctx->pix_fmt = PIX_FMT_GRAY16;
break;
case 0x12111100:
case 0x22211100:
@ -723,7 +726,12 @@ static int ljpeg_decode_rgb_scan(MJpegDecodeContext *s, int predictor, int point
static int ljpeg_decode_yuv_scan(MJpegDecodeContext *s, int predictor, int point_transform){
int i, mb_x, mb_y;
const int nb_components=3;
const int nb_components=s->nb_components;
int bits= (s->bits+7)&~7;
point_transform += bits - s->bits;
av_assert0(nb_components==1 || nb_components==3);
for(mb_y = 0; mb_y < s->mb_height; mb_y++) {
for(mb_x = 0; mb_x < s->mb_width; mb_x++) {
@ -733,6 +741,7 @@ static int ljpeg_decode_yuv_scan(MJpegDecodeContext *s, int predictor, int point
if(mb_x==0 || mb_y==0 || s->interlaced){
for(i=0;i<nb_components;i++) {
uint8_t *ptr;
uint16_t *ptr16;
int n, h, v, x, y, c, j, linesize;
n = s->nb_blocks[i];
c = s->comp_index[i];
@ -742,13 +751,19 @@ static int ljpeg_decode_yuv_scan(MJpegDecodeContext *s, int predictor, int point
y = 0;
linesize= s->linesize[c];
if(bits>8) linesize /= 2;
for(j=0; j<n; j++) {
int pred, dc;
dc = mjpeg_decode_dc(s, s->dc_index[i]);
if(dc == 0xFFFF)
return -1;
if(bits<=8){
ptr = s->picture.data[c] + (linesize * (v * mb_y + y)) + (h * mb_x + x); //FIXME optimize this crap
if(y==0 && mb_y==0){
if(x==0 && mb_x==0){
pred= 128 << point_transform;
pred= 1 << (bits - 1);
}else{
pred= ptr[-1];
}
@ -762,11 +777,27 @@ static int ljpeg_decode_yuv_scan(MJpegDecodeContext *s, int predictor, int point
if (s->interlaced && s->bottom_field)
ptr += linesize >> 1;
dc = mjpeg_decode_dc(s, s->dc_index[i]);
if(dc == 0xFFFF)
return -1;
*ptr= pred + (dc << point_transform);
}else{
ptr16 = s->picture.data[c] + 2*(linesize * (v * mb_y + y)) + 2*(h * mb_x + x); //FIXME optimize this crap
if(y==0 && mb_y==0){
if(x==0 && mb_x==0){
pred= 1 << (bits - 1);
}else{
pred= ptr16[-1];
}
}else{
if(x==0 && mb_x==0){
pred= ptr16[-linesize];
}else{
PREDICT(pred, ptr16[-linesize-1], ptr16[-linesize], ptr16[-1], predictor);
}
}
if (s->interlaced && s->bottom_field)
ptr16 += linesize >> 1;
*ptr16= pred + (dc << point_transform);
}
if (++x == h) {
x = 0;
y++;
@ -776,6 +807,7 @@ static int ljpeg_decode_yuv_scan(MJpegDecodeContext *s, int predictor, int point
}else{
for(i=0;i<nb_components;i++) {
uint8_t *ptr;
uint16_t *ptr16;
int n, h, v, x, y, c, j, linesize, dc;
n = s->nb_blocks[i];
c = s->comp_index[i];
@ -785,16 +817,25 @@ static int ljpeg_decode_yuv_scan(MJpegDecodeContext *s, int predictor, int point
y = 0;
linesize= s->linesize[c];
if(bits>8) linesize /= 2;
for(j=0; j<n; j++) {
int pred;
ptr = s->picture.data[c] + (linesize * (v * mb_y + y)) + (h * mb_x + x); //FIXME optimize this crap
PREDICT(pred, ptr[-linesize-1], ptr[-linesize], ptr[-1], predictor);
dc = mjpeg_decode_dc(s, s->dc_index[i]);
if(dc == 0xFFFF)
return -1;
if(bits<=8){
ptr = s->picture.data[c] + (linesize * (v * mb_y + y)) + (h * mb_x + x); //FIXME optimize this crap
PREDICT(pred, ptr[-linesize-1], ptr[-linesize], ptr[-1], predictor);
*ptr= pred + (dc << point_transform);
}else{
ptr16 = s->picture.data[c] + 2*(linesize * (v * mb_y + y)) + 2*(h * mb_x + x); //FIXME optimize this crap
PREDICT(pred, ptr16[-linesize-1], ptr16[-linesize], ptr16[-1], predictor);
*ptr16= pred + (dc << point_transform);
}
if (++x == h) {
x = 0;
y++;