[FFmpeg-cvslog] swscale/swscale_unscaled: fix planarCopyWrapper() for yuv444p => yuva444p

[Ramiro Polla]

ffmpeg | branch: master | Ramiro Polla <ramiro.polla at gmail.com> | Sun May 18 22:52:07 2025 +0200| [a16c053a333b43d547b01834a6c89dde2459c8b5] | committer: Ramiro Polla

swscale/swscale_unscaled: fix planarCopyWrapper() for yuv444p => yuva444p

Currently, planarCopyWrapper() assumes that src[3] must be NULL when
the source format has no alpha plane.

This commit updates the condition for filling the alpha plane based on
the number of components available in the source format as well.

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=a16c053a333b43d547b01834a6c89dde2459c8b5
---

 libswscale/swscale_unscaled.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libswscale/swscale_unscaled.c b/libswscale/swscale_unscaled.c
index b84120549e..307e5471a9 100644
--- a/libswscale/swscale_unscaled.c
+++ b/libswscale/swscale_unscaled.c
@@ -2221,7 +2221,7 @@ static int planarCopyWrapper(SwsInternal *c, const uint8_t *const src[],
 
         // ignore palette for GRAY8
         if (plane == 1 && desc_dst->nb_components < 3) continue;
-        if (!src[plane] || (plane == 1 && desc_src->nb_components < 3)) {
+        if (!src[plane] || (plane == 1 && desc_src->nb_components < 3) || (plane == 3 && desc_src->nb_components <= 3)) {
             if (is16BPS(c->opts.dst_format) || isNBPS(c->opts.dst_format)) {
                 fillPlane16(dst[plane], dstStride[plane], length, height, y,
                         plane == 3, desc_dst->comp[plane].depth,