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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.
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@ -144,7 +144,7 @@ int ff_rotate_slice(SwsSlice *s, int lum, int chr)
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return 0;
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}
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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)
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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)
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{
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int i = 0;
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@ -158,30 +158,32 @@ int ff_init_slice_from_src(SwsSlice * s, uint8_t *src[4], int stride[4], int src
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chrY + chrH,
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lumY + lumH};
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const uint8_t *src_[4] = {src[0] + (relative ? 0 : start[0]) * stride[0],
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src[1] + (relative ? 0 : start[1]) * stride[0],
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src[2] + (relative ? 0 : start[2]) * stride[0],
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src[3] + (relative ? 0 : start[3]) * stride[0]};
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s->width = srcW;
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for (i = 0; i < 4; ++i) {
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int j;
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int lines = end[i];
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lines = s->plane[i].available_lines < lines ? s->plane[i].available_lines : lines;
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int first = s->plane[i].sliceY;
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int n = s->plane[i].available_lines;
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int lines = end[i] - start[i];
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int tot_lines = end[i] - first;
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if (end[i] > s->plane[i].sliceY+s->plane[i].sliceH) {
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if (start[i] <= s->plane[i].sliceY+1)
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s->plane[i].sliceY = FFMIN(start[i], s->plane[i].sliceY);
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else
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s->plane[i].sliceY = start[i];
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s->plane[i].sliceH = end[i] - s->plane[i].sliceY;
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if (start[i] >= first && n >= tot_lines) {
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s->plane[i].sliceH = FFMAX(tot_lines, s->plane[i].sliceH);
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for (j = 0; j < lines; j+= 1)
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s->plane[i].line[start[i] - first + j] = src_[i] + j * stride[i];
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} else {
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if (end[i] >= s->plane[i].sliceY)
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s->plane[i].sliceH = s->plane[i].sliceY + s->plane[i].sliceH - start[i];
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else
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s->plane[i].sliceH = end[i] - start[i];
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s->plane[i].sliceY = start[i];
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lines = lines > n ? n : lines;
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s->plane[i].sliceH = lines;
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for (j = 0; j < lines; j+= 1)
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s->plane[i].line[j] = src_[i] + j * stride[i];
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}
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for (j = start[i]; j < lines; j+= 1)
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s->plane[i].line[j] = src[i] + (start[i] + j) * stride[i];
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}
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return 0;
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@ -475,11 +475,11 @@ static int swscale(SwsContext *c, const uint8_t *src[],
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yuv2packed1, yuv2packed2, yuv2packedX, yuv2anyX, c->use_mmx_vfilter);
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ff_init_slice_from_src(src_slice, (uint8_t**)src, srcStride, c->srcW,
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srcSliceY, srcSliceH, chrSrcSliceY, chrSrcSliceH);
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srcSliceY, srcSliceH, chrSrcSliceY, chrSrcSliceH, 1);
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ff_init_slice_from_src(vout_slice, (uint8_t**)dst, dstStride, c->dstW,
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dstY, dstH, dstY >> c->chrDstVSubSample,
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FF_CEIL_RSHIFT(dstH, c->chrDstVSubSample));
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FF_CEIL_RSHIFT(dstH, c->chrDstVSubSample), 0);
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if (srcSliceY == 0) {
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hout_slice->plane[0].sliceY = lastInLumBuf + 1;
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hout_slice->plane[1].sliceY = lastInChrBuf + 1;
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@ -1013,7 +1013,8 @@ typedef struct VScalerContext
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} VScalerContext;
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// warp input lines in the form (src + width*i + j) to slice format (line[i][j])
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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);
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// relative=true means first line src[x][0] otherwise first line is src[x][lum/crh Y]
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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);
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// Initialize scaler filter descriptor chain
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int ff_init_filters(SwsContext *c);
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