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utvideo: account for coupled lines in YUV420 format

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Luma slices in YUV420 colourspace should have height in multiple of two since
they have the same line of chrominance data corresponding to pair of them.

Signed-off-by: Ronald S. Bultje <rsbultje@gmail.com>
This commit is contained in:
Kostya Shishkov 2011-10-28 20:40:23 +02:00 committed by Ronald S. Bultje
parent 8370e426e4
commit 9a173575fd
1 changed files with 9 additions and 7 deletions
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16
libavcodec/utvideo.c
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@ -113,6 +113,7 @@ static int decode_plane(UtvideoContext *c, int plane_no,
VLC vlc;
GetBitContext gb;
int prev;
const int cmask = ~(!plane_no && c->avctx->pix_fmt == PIX_FMT_YUV420P);
if (build_huff(src, &vlc)) {
av_log(c->avctx, AV_LOG_ERROR, "Cannot build Huffman codes\n");
@ -128,7 +129,7 @@ static int decode_plane(UtvideoContext *c, int plane_no,
int slice_data_start, slice_data_end, slice_size;
sstart = send;
send = height * (slice + 1) / c->slices;
send = (height * (slice + 1) / c->slices) & cmask;
dest = dst + sstart * stride;
// slice offset and size validation was done earlier
@ -204,16 +205,17 @@ static void restore_rgb_planes(uint8_t *src, int step, int stride, int width, in
}
static void restore_median(uint8_t *src, int step, int stride,
int width, int height, int slices)
int width, int height, int slices, int rmode)
{
int i, j, slice;
int A, B, C;
uint8_t *bsrc;
int slice_start, slice_height;
const int cmask = ~rmode;
for (slice = 0; slice < slices; slice++) {
slice_start = (slice * height) / slices;
slice_height = ((slice + 1) * height) / slices - slice_start;
slice_start = ((slice * height) / slices) & cmask;
slice_height = ((((slice + 1) * height) / slices) & cmask) - slice_start;
bsrc = src + slice_start * stride;
@ -337,7 +339,7 @@ static int decode_frame(AVCodecContext *avctx, void *data, int *data_size, AVPac
if (c->frame_pred == PRED_MEDIAN)
restore_median(c->pic.data[0] + rgb_order[i], c->planes,
c->pic.linesize[0], avctx->width, avctx->height,
c->slices);
c->slices, 0);
}
restore_rgb_planes(c->pic.data[0], c->planes, c->pic.linesize[0],
avctx->width, avctx->height);
@ -353,7 +355,7 @@ static int decode_frame(AVCodecContext *avctx, void *data, int *data_size, AVPac
if (c->frame_pred == PRED_MEDIAN)
restore_median(c->pic.data[i], 1, c->pic.linesize[i],
avctx->width >> !!i, avctx->height >> !!i,
c->slices);
c->slices, !i);
}
break;
case PIX_FMT_YUV422P:
@ -366,7 +368,7 @@ static int decode_frame(AVCodecContext *avctx, void *data, int *data_size, AVPac
return ret;
if (c->frame_pred == PRED_MEDIAN)
restore_median(c->pic.data[i], 1, c->pic.linesize[i],
avctx->width >> !!i, avctx->height, c->slices);
avctx->width >> !!i, avctx->height, c->slices, 0);
}
break;
}