avfilter/vf_v360: improve equirect_to_xyz() quality

5 years ago · ebc8806b9f
parent c48e5431c8
commit ebc8806b9f
1 changed files with 2 additions and 2 deletions
--- 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);