Place it right after the input parameter validation. There is no point
in performing any setup if the sws_scale() call won't do anything.
---
libswscale/swscale.c | 8 ++++----
1 file changed, 4 insertions(+), 4 deletions(-)
diff --git a/libswscale/swscale.c b/libswscale/swscale.c
index 270adcc072..2d6ed95cfb 100644
--- a/libswscale/swscale.c
+++ b/libswscale/swscale.c
@@ -897,6 +897,10 @@ int attribute_align_arg sws_scale(struct SwsContext *c,
return AVERROR(EINVAL);
}
+ // do not mess up sliceDir if we have a "trailing" 0-size slice
+ if (srcSliceH == 0)
+ return 0;
+
if (c->gamma_flag && c->cascaded_context[0])
return scale_gamma(c, srcSlice, srcStride, srcSliceY, srcSliceH, dst,
dstStride);
@@ -908,10 +912,6 @@ int attribute_align_arg sws_scale(struct SwsContext *c,
memcpy(srcStride2, srcStride, sizeof(srcStride2));
memcpy(dstStride2, dstStride, sizeof(dstStride2));
- // do not mess up sliceDir if we have a "trailing" 0-size slice
- if (srcSliceH == 0)
- return 0;
-
if (frame_start) {
if (srcSliceY != 0 && srcSliceY + srcSliceH != c->srcH) {
av_log(c, AV_LOG_ERROR, "Slices start in the middle!\n");
--
2.30.2
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