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avfilter/vf_v360: really fix FoV selection 

Big thanks to Michael Koch for providing actual formula.
This commit is contained in:
Paul B Mahol 2019-09-11 15:00:12 +02:00
parent 944d76a3e0
commit cb41c2af92
1 changed files with 5 additions and 2 deletions
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7
libavfilter/vf_v360.c
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@ -1410,8 +1410,11 @@ static void stereographic_to_xyz(const V360Context *s,
int i, int j, int width, int height,
float *vec)
{
const float x = ((2.f * i) / width - 1.f) * (s->h_fov / 180.f);
const float y = ((2.f * j) / height - 1.f) * (s->v_fov / 180.f);
const float h_angle = tan(FFMIN(s->h_fov, 359.f) * M_PI / 720.f);
const float v_angle = tan(FFMIN(s->v_fov, 359.f) * M_PI / 720.f);
const float x = ((2.f * i) / width - 1.f) * h_angle;
const float y = ((2.f * j) / height - 1.f) * v_angle;
const float xy = x * x + y * y;
vec[0] = 2.f * x / (1.f + xy);