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swscale/utils: Fix intermediate format for cascaded alpha downscaling

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Fixes Ticket4926

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
(cherry picked from commit b83d8be6bff7d645469a623aee0b380541da15cf)

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2015-12-24 21:46:15 +01:00
parent 2f65366c11
commit 0a6324fe93
1 changed files with 3 additions and 0 deletions
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3
libswscale/utils.c
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@ -1786,6 +1786,9 @@ fail: // FIXME replace things by appropriate error codes
int tmpH = sqrt(srcH * (int64_t)dstH);
enum AVPixelFormat tmpFormat = AV_PIX_FMT_YUV420P;
if (isALPHA(srcFormat))
tmpFormat = AV_PIX_FMT_YUVA420P;
if (srcW*(int64_t)srcH <= 4LL*dstW*dstH)
return AVERROR(EINVAL);