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avcodec/jpeglsdec: support PAL1-PAL7 

Fixes Ticket3933

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2015-03-22 20:31:03 +01:00
parent 74097e0902
commit a089d567f1
1 changed files with 10 additions and 2 deletions
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12
libavcodec/jpeglsdec.c
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@ -111,12 +111,20 @@ int ff_jpegls_decode_lse(MJpegDecodeContext *s)
if ((s->avctx->pix_fmt == AV_PIX_FMT_GRAY8 || s->avctx->pix_fmt == AV_PIX_FMT_PAL8) &&
(s->picture_ptr->format == AV_PIX_FMT_GRAY8 || s->picture_ptr->format == AV_PIX_FMT_PAL8)) {
uint32_t *pal = (uint32_t *)s->picture_ptr->data[1];
int shift = 0;
if (s->avctx->bits_per_raw_sample > 0 && s->avctx->bits_per_raw_sample < 8) {
maxtab = FFMIN(maxtab, (1<<s->avctx->bits_per_raw_sample)-1);
shift = 8 - s->avctx->bits_per_raw_sample;
}
s->picture_ptr->format =
s->avctx->pix_fmt = AV_PIX_FMT_PAL8;
for (i=s->palette_index; i<=maxtab; i++) {
pal[i] = 0;
uint8_t k = i << shift;
pal[k] = 0;
for (j=0; j<wt; j++) {
pal[i] |= get_bits(&s->gb, 8) << (8*(wt-j-1));
pal[k] |= get_bits(&s->gb, 8) << (8*(wt-j-1));
}
}
s->palette_index = i;