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swscale: fix ring buffer size when scaling slices of a frame

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The ring buffer size should be able to store input lines
when there is not enough lines to output a single line.
This commit is contained in:
Pedro Arthur 2016-06-08 21:38:49 -03:00
parent b5deacfb1f
commit e616e9a4b8
2 changed files with 51 additions and 6 deletions
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47
libswscale/slice.c
View File

@ -210,6 +210,42 @@ static void fill_ones(SwsSlice *s, int n, int is16bit)
}
}
/*
Calculates the minimum ring buffer size, it should be able to store vFilterSize
more n lines where n is the max difference between each adjacent slice which
outputs a line.
The n lines are needed only when there is not enough src lines to output a single
dst line, then we should buffer these lines to process them on the next call to scale.
*/
static void get_min_buffer_size(SwsContext *c, int *out_lum_size, int *out_chr_size)
{
int lumY;
int dstH = c->dstH;
int chrDstH = c->chrDstH;
int *lumFilterPos = c->vLumFilterPos;
int *chrFilterPos = c->vChrFilterPos;
int lumFilterSize = c->vLumFilterSize;
int chrFilterSize = c->vChrFilterSize;
int chrSubSample = c->chrSrcVSubSample;
*out_lum_size = lumFilterSize;
*out_chr_size = chrFilterSize;
for (lumY = 0; lumY < dstH; lumY++) {
int chrY = (int64_t)lumY * chrDstH / dstH;
int nextSlice = FFMAX(lumFilterPos[lumY] + lumFilterSize - 1,
((chrFilterPos[chrY] + chrFilterSize - 1)
<< chrSubSample));
nextSlice >>= chrSubSample;
nextSlice <<= chrSubSample;
(*out_lum_size) = FFMAX((*out_lum_size), nextSlice - lumFilterPos[lumY]);
(*out_chr_size) = FFMAX((*out_chr_size), (nextSlice >> chrSubSample) - chrFilterPos[chrY]);
}
}
int ff_init_filters(SwsContext * c)
{
int i;
@ -226,6 +262,13 @@ int ff_init_filters(SwsContext * c)
uint32_t * pal = usePal(c->srcFormat) ? c->pal_yuv : (uint32_t*)c->input_rgb2yuv_table;
int res = 0;
int lumBufSize;
int chrBufSize;
get_min_buffer_size(c, &lumBufSize, &chrBufSize);
lumBufSize = FFMAX(lumBufSize, c->vLumFilterSize + MAX_LINES_AHEAD);
chrBufSize = FFMAX(chrBufSize, c->vChrFilterSize + MAX_LINES_AHEAD);
if (c->dstBpc == 16)
dst_stride <<= 1;
@ -248,13 +291,13 @@ int ff_init_filters(SwsContext * c)
res = alloc_slice(&c->slice[0], c->srcFormat, c->srcH, c->chrSrcH, c->chrSrcHSubSample, c->chrSrcVSubSample, 0);
if (res < 0) goto cleanup;
for (i = 1; i < c->numSlice-2; ++i) {
res = alloc_slice(&c->slice[i], c->srcFormat, c->vLumFilterSize + MAX_LINES_AHEAD, c->vChrFilterSize + MAX_LINES_AHEAD, c->chrSrcHSubSample, c->chrSrcVSubSample, 0);
res = alloc_slice(&c->slice[i], c->srcFormat, lumBufSize, chrBufSize, c->chrSrcHSubSample, c->chrSrcVSubSample, 0);
if (res < 0) goto cleanup;
res = alloc_lines(&c->slice[i], FFALIGN(c->srcW*2+78, 16), c->srcW);
if (res < 0) goto cleanup;
}
// horizontal scaler output
res = alloc_slice(&c->slice[i], c->srcFormat, c->vLumFilterSize + MAX_LINES_AHEAD, c->vChrFilterSize + MAX_LINES_AHEAD, c->chrDstHSubSample, c->chrDstVSubSample, 1);
res = alloc_slice(&c->slice[i], c->srcFormat, lumBufSize, chrBufSize, c->chrDstHSubSample, c->chrDstVSubSample, 1);
if (res < 0) goto cleanup;
res = alloc_lines(&c->slice[i], dst_stride, c->dstW);
if (res < 0) goto cleanup;

10
libswscale/swscale.c
View File

@ -413,8 +413,6 @@ static int swscale(SwsContext *c, const uint8_t *src[],
lastInChrBuf = firstChrSrcY - 1;
}
av_assert0(firstLumSrcY >= lastInLumBuf - vLumFilterSize + 1);
av_assert0(firstChrSrcY >= lastInChrBuf - vChrFilterSize + 1);
DEBUG_BUFFERS("dstY: %d\n", dstY);
DEBUG_BUFFERS("\tfirstLumSrcY: %d lastLumSrcY: %d lastInLumBuf: %d\n",
@ -433,10 +431,14 @@ static int swscale(SwsContext *c, const uint8_t *src[],
lastLumSrcY, lastChrSrcY);
}
av_assert0((lastLumSrcY - firstLumSrcY + 1) <= hout_slice->plane[0].available_lines);
av_assert0((lastChrSrcY - firstChrSrcY + 1) <= hout_slice->plane[1].available_lines);
posY = hout_slice->plane[0].sliceY + hout_slice->plane[0].sliceH;
if (posY <= lastLumSrcY && !hasLumHoles) {
firstPosY = FFMAX(firstLumSrcY, posY);
lastPosY = FFMIN(lastLumSrcY + MAX_LINES_AHEAD, srcSliceY + srcSliceH - 1);
lastPosY = FFMIN(firstLumSrcY + hout_slice->plane[0].available_lines - 1, srcSliceY + srcSliceH - 1);
} else {
firstPosY = lastInLumBuf + 1;
lastPosY = lastLumSrcY;
@ -445,7 +447,7 @@ static int swscale(SwsContext *c, const uint8_t *src[],
cPosY = hout_slice->plane[1].sliceY + hout_slice->plane[1].sliceH;
if (cPosY <= lastChrSrcY && !hasChrHoles) {
firstCPosY = FFMAX(firstChrSrcY, cPosY);
lastCPosY = FFMIN(lastChrSrcY + MAX_LINES_AHEAD, AV_CEIL_RSHIFT(srcSliceY + srcSliceH, c->chrSrcVSubSample) - 1);
lastCPosY = FFMIN(firstChrSrcY + hout_slice->plane[1].available_lines - 1, AV_CEIL_RSHIFT(srcSliceY + srcSliceH, c->chrSrcVSubSample) - 1);
} else {
firstCPosY = lastInChrBuf + 1;
lastCPosY = lastChrSrcY;