[FFmpeg-cvslog] swscale/output: Implement Luma computation from yuv2ya16_X_c_template() without 64bit

[Michael Niedermayer]

ffmpeg | branch: master | Michael Niedermayer <michael at niedermayer.cc> | Thu Sep 26 17:10:49 2019 +0200| [4f4ca675e59795c743ab1d0ec9b4f3ece883f650] | committer: Michael Niedermayer

swscale/output: Implement Luma computation from yuv2ya16_X_c_template() without 64bit

This also reverts 21838cad2fc44023ad85e35d5c677e2f8d29a0ef
The revert is in this commit to avoid 2 fate updates

Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=4f4ca675e59795c743ab1d0ec9b4f3ece883f650
---

 libswscale/output.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/libswscale/output.c b/libswscale/output.c
index 0e20a0a6b8..60a9bdfe82 100644
--- a/libswscale/output.c
+++ b/libswscale/output.c
@@ -904,13 +904,14 @@ yuv2ya16_X_c_template(SwsContext *c, const int16_t *lumFilter,
 
     for (i = 0; i < dstW; i++) {
         int j;
-        int64_t Y = 1 << 18;
+        int Y = -0x40000000;
         int64_t A = 0xffff<<14;
 
         for (j = 0; j < lumFilterSize; j++)
             Y += lumSrc[j][i] * lumFilter[j];
 
         Y >>= 15;
+        Y += (1<<3) + 0x8000;
         Y = av_clip_uint16(Y);
 
         if (hasAlpha) {