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swscale: fix ticket #4881 

When scaling only a slice of a frame the output was written always
in the first lines leaving the rest of the frame black.
This commit is contained in:
Pedro Arthur 2015-10-13 13:32:07 -03:00
parent de262d018d
commit 5bd62a1b3c
3 changed files with 22 additions and 19 deletions
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34
libswscale/slice.c
View File

@ -144,7 +144,7 @@ int ff_rotate_slice(SwsSlice *s, int lum, int chr)
return 0;
}
int ff_init_slice_from_src(SwsSlice * s, uint8_t *src[4], int stride[4], int srcW, int lumY, int lumH, int chrY, int chrH)
int ff_init_slice_from_src(SwsSlice * s, uint8_t *src[4], int stride[4], int srcW, int lumY, int lumH, int chrY, int chrH, int relative)
{
int i = 0;
@ -158,30 +158,32 @@ int ff_init_slice_from_src(SwsSlice * s, uint8_t *src[4], int stride[4], int src
chrY + chrH,
lumY + lumH};
const uint8_t *src_[4] = {src[0] + (relative ? 0 : start[0]) * stride[0],
src[1] + (relative ? 0 : start[1]) * stride[0],
src[2] + (relative ? 0 : start[2]) * stride[0],
src[3] + (relative ? 0 : start[3]) * stride[0]};
s->width = srcW;
for (i = 0; i < 4; ++i) {
int j;
int lines = end[i];
lines = s->plane[i].available_lines < lines ? s->plane[i].available_lines : lines;
int first = s->plane[i].sliceY;
int n = s->plane[i].available_lines;
int lines = end[i] - start[i];
int tot_lines = end[i] - first;
if (end[i] > s->plane[i].sliceY+s->plane[i].sliceH) {
if (start[i] <= s->plane[i].sliceY+1)
s->plane[i].sliceY = FFMIN(start[i], s->plane[i].sliceY);
else
s->plane[i].sliceY = start[i];
s->plane[i].sliceH = end[i] - s->plane[i].sliceY;
if (start[i] >= first && n >= tot_lines) {
s->plane[i].sliceH = FFMAX(tot_lines, s->plane[i].sliceH);
for (j = 0; j < lines; j+= 1)
s->plane[i].line[start[i] - first + j] = src_[i] + j * stride[i];
} else {
if (end[i] >= s->plane[i].sliceY)
s->plane[i].sliceH = s->plane[i].sliceY + s->plane[i].sliceH - start[i];
else
s->plane[i].sliceH = end[i] - start[i];
s->plane[i].sliceY = start[i];
lines = lines > n ? n : lines;
s->plane[i].sliceH = lines;
for (j = 0; j < lines; j+= 1)
s->plane[i].line[j] = src_[i] + j * stride[i];
}
for (j = start[i]; j < lines; j+= 1)
s->plane[i].line[j] = src[i] + (start[i] + j) * stride[i];
}
return 0;

4
libswscale/swscale.c
View File

@ -475,11 +475,11 @@ static int swscale(SwsContext *c, const uint8_t *src[],
yuv2packed1, yuv2packed2, yuv2packedX, yuv2anyX, c->use_mmx_vfilter);
ff_init_slice_from_src(src_slice, (uint8_t**)src, srcStride, c->srcW,
srcSliceY, srcSliceH, chrSrcSliceY, chrSrcSliceH);
srcSliceY, srcSliceH, chrSrcSliceY, chrSrcSliceH, 1);
ff_init_slice_from_src(vout_slice, (uint8_t**)dst, dstStride, c->dstW,
dstY, dstH, dstY >> c->chrDstVSubSample,
FF_CEIL_RSHIFT(dstH, c->chrDstVSubSample));
FF_CEIL_RSHIFT(dstH, c->chrDstVSubSample), 0);
if (srcSliceY == 0) {
hout_slice->plane[0].sliceY = lastInLumBuf + 1;
hout_slice->plane[1].sliceY = lastInChrBuf + 1;

3
libswscale/swscale_internal.h
View File

@ -1013,7 +1013,8 @@ typedef struct VScalerContext
} VScalerContext;
// warp input lines in the form (src + width*i + j) to slice format (line[i][j])
int ff_init_slice_from_src(SwsSlice * s, uint8_t *src[4], int stride[4], int srcW, int lumY, int lumH, int chrY, int chrH);
// relative=true means first line src[x][0] otherwise first line is src[x][lum/crh Y]
int ff_init_slice_from_src(SwsSlice * s, uint8_t *src[4], int stride[4], int srcW, int lumY, int lumH, int chrY, int chrH, int relative);
// Initialize scaler filter descriptor chain
int ff_init_filters(SwsContext *c);