avfilter/vf_v360: call tanf() once

6 years ago · f78abca0c2
parent cb8d6a4e3e
commit f78abca0c2
1 changed files with 3 additions and 3 deletions
--- a/libavfilter/vf_v360.c
+++ b/libavfilter/vf_v360.c
@ -2142,11 +2142,11 @@ static int allocate_plane(V360Context *s, int sizeof_uv, int sizeof_ker, int p)

 static void fov_from_dfov(V360Context *s, float w, float h)
 {
-    const float d_angle = 0.5 * FFMIN(s->d_fov, 359.f) * M_PI / 180.f;
+    const float da = tanf(0.5 * FFMIN(s->d_fov, 359.f) * M_PI / 180.f);
    const float d = hypotf(w, h);

-    s->h_fov = atan2f(tanf(d_angle) * w, d) * 360.f / M_PI;
-    s->v_fov = atan2f(tanf(d_angle) * h, d) * 360.f / M_PI;
+    s->h_fov = atan2f(da * w, d) * 360.f / M_PI;
+    s->v_fov = atan2f(da * h, d) * 360.f / M_PI;

    if (s->h_fov < 0.f)
        s->h_fov += 360.f;