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Code Issues Releases Activity

avcodec/mjpegdec: 12bit Grayscale support

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Fixes part of Ticket2812

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2013-09-06 00:57:50 +02:00
parent 1deeb9437c
commit c407c73457
1 changed files with 14 additions and 6 deletions
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20
libavcodec/mjpegdec.c
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@ -232,11 +232,6 @@ int ff_mjpeg_decode_sof(MJpegDecodeContext *s)
if (s->bits == 9 && !s->pegasus_rct)
s->rct = 1; // FIXME ugly
if (s->bits != 8 && !s->lossless) {
av_log(s->avctx, AV_LOG_ERROR, "only 8 bits/component accepted\n");
return -1;
}
if(s->lossless && s->avctx->lowres){
av_log(s->avctx, AV_LOG_ERROR, "lowres is not possible with lossless jpeg\n");
return -1;
@ -270,6 +265,12 @@ int ff_mjpeg_decode_sof(MJpegDecodeContext *s)
"bits/component or 16-bit gray");
return AVERROR_PATCHWELCOME;
}
if (!s->lossless && !(s->bits <= 8 || nb_components == 1)) {
avpriv_report_missing_feature(s->avctx,
"lossy that is not <= 8 "
"bits/component or 16-bit gray");
return AVERROR_PATCHWELCOME;
}
s->nb_components = nb_components;
s->h_max = 1;
s->v_max = 1;
@ -1052,6 +1053,7 @@ static int mjpeg_decode_scan(MJpegDecodeContext *s, int nb_components, int Ah,
const uint8_t *reference_data[MAX_COMPONENTS];
int linesize[MAX_COMPONENTS];
GetBitContext mb_bitmask_gb;
int bytes_per_pixel = 1 + (s->bits > 8);
if (mb_bitmask)
init_get_bits(&mb_bitmask_gb, mb_bitmask, s->mb_width * s->mb_height);
@ -1101,7 +1103,7 @@ static int mjpeg_decode_scan(MJpegDecodeContext *s, int nb_components, int Ah,
y = 0;
for (j = 0; j < n; j++) {
block_offset = (((linesize[c] * (v * mb_y + y) * 8) +
(h * mb_x + x) * 8) >> s->avctx->lowres);
(h * mb_x + x) * 8 * bytes_per_pixel) >> s->avctx->lowres);
if (s->interlaced && s->bottom_field)
block_offset += linesize[c] >> 1;
@ -1123,11 +1125,17 @@ static int mjpeg_decode_scan(MJpegDecodeContext *s, int nb_components, int Ah,
s->dsp.idct_put(ptr, linesize[c], s->block);
if (s->bits & 7) {
int block_x, block_y;
if (s->bits > 8) {
for (block_y=0; block_y<8; block_y++)
for (block_x=0; block_x<8; block_x++)
*(uint16_t*)(ptr + 2*block_x + block_y*linesize[c]) <<= 16 - s->bits;
} else {
for (block_y=0; block_y<8; block_y++)
for (block_x=0; block_x<8; block_x++)
*(ptr + 2*block_x + block_y*linesize[c]) <<= 8 - s->bits;
}
}
}
} else {
int block_idx = s->block_stride[c] * (v * mb_y + y) +
(h * mb_x + x);