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avcodec/jpeglsdec: add PAL8 support

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Fixes Ticket3478

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2014-04-01 13:43:44 +02:00
parent 879072018f
commit 254f653b24
3 changed files with 48 additions and 3 deletions
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48
libavcodec/jpeglsdec.c
View File

@ -50,8 +50,9 @@
int ff_jpegls_decode_lse(MJpegDecodeContext *s)
{
int id;
int tid, wt, maxtab, i, j;
skip_bits(&s->gb, 16); /* length: FIXME: verify field validity */
int len = get_bits(&s->gb, 16); /* length: FIXME: verify field validity */
id = get_bits(&s->gb, 8);
switch (id) {
@ -66,9 +67,50 @@ int ff_jpegls_decode_lse(MJpegDecodeContext *s)
//FIXME quant table?
break;
case 2:
s->palette_index = 0;
case 3:
av_log(s->avctx, AV_LOG_ERROR, "palette not supported\n");
return AVERROR(ENOSYS);
tid= get_bits(&s->gb, 8);
wt = get_bits(&s->gb, 8);
if (len < 5)
return AVERROR_INVALIDDATA;
if (wt < 1 || wt > MAX_COMPONENTS) {
avpriv_request_sample(s->avctx, "wt %d", wt);
return AVERROR_PATCHWELCOME;
}
if ((5 + wt*(s->maxval+1)) < 65535)
maxtab = s->maxval;
else
maxtab = 65530/wt - 1;
if(s->avctx->debug & FF_DEBUG_PICT_INFO) {
av_log(s->avctx, AV_LOG_DEBUG, "LSE palette %d tid:%d wt:%d maxtab:%d\n", id, tid, wt, maxtab);
}
if (maxtab >= 256) {
avpriv_request_sample(s->avctx, ">8bit palette");
return AVERROR_PATCHWELCOME;
}
maxtab = FFMIN(maxtab, (len - 5) / wt + s->palette_index);
if (s->palette_index > maxtab)
return AVERROR_INVALIDDATA;
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 = s->picture_ptr->data[1];
s->picture_ptr->format =
s->avctx->pix_fmt = AV_PIX_FMT_PAL8;
for (i=s->palette_index; i<maxtab; i++) {
pal[i] = 0;
for (j=0; j<wt; j++) {
pal[i] |= get_bits(&s->gb, 8) << (8*wt);
}
}
s->palette_index = i;
}
break;
case 4:
av_log(s->avctx, AV_LOG_ERROR, "oversize image not supported\n");
return AVERROR(ENOSYS);

2
libavcodec/mjpegdec.c
View File

@ -517,6 +517,8 @@ unk_pixfmt:
s->upscale_h = s->upscale_v = 0;
if (s->nb_components > 1)
s->avctx->pix_fmt = AV_PIX_FMT_RGB24;
else if (s->palette_index && s->bits <= 8)
s->avctx->pix_fmt = AV_PIX_FMT_PAL8;
else if (s->bits <= 8)
s->avctx->pix_fmt = AV_PIX_FMT_GRAY8;
else

1
libavcodec/mjpegdec.h
View File

@ -102,6 +102,7 @@ typedef struct MJpegDecodeContext {
int16_t (*blocks[MAX_COMPONENTS])[64]; ///< intermediate sums (progressive mode)
uint8_t *last_nnz[MAX_COMPONENTS];
uint64_t coefs_finished[MAX_COMPONENTS]; ///< bitmask of which coefs have been completely decoded (progressive mode)
int palette_index;
ScanTable scantable;
DSPContext dsp;
HpelDSPContext hdsp;