[FFmpeg-cvslog] avfilter/vf_v360: improve equirect_to_xyz() quality

[Paul B Mahol]

ffmpeg | branch: master | Paul B Mahol <onemda at gmail.com> | Sun Feb 23 18:15:06 2020 +0100| [ebc8806b9fcc8a2130773ddfd2f1678f78c24200] | committer: Paul B Mahol

avfilter/vf_v360: improve equirect_to_xyz() quality

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=ebc8806b9fcc8a2130773ddfd2f1678f78c24200
---

 libavfilter/vf_v360.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/libavfilter/vf_v360.c b/libavfilter/vf_v360.c
index de79fcdcf2..dee632c258 100644
--- a/libavfilter/vf_v360.c
+++ b/libavfilter/vf_v360.c
@@ -1561,8 +1561,8 @@ static int equirect_to_xyz(const V360Context *s,
                            int i, int j, int width, int height,
                            float *vec)
 {
-    const float phi   = ((2.f * i) / width  - 1.f) * M_PI;
-    const float theta = ((2.f * j) / height - 1.f) * M_PI_2;
+    const float phi   = ((2.f * i + 0.5f) / width  - 1.f) * M_PI;
+    const float theta = ((2.f * j + 0.5f) / height - 1.f) * M_PI_2;
 
     const float sin_phi   = sinf(phi);
     const float cos_phi   = cosf(phi);