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avfilter/vf_v360: fix hfov/vfov calculation from dfov for sg projection

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This commit is contained in:
Paul B Mahol 2020-03-25 13:38:01 +01:00
parent e5d25d1147
commit 0b43897530
1 changed files with 9 additions and 0 deletions
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9
libavfilter/vf_v360.c
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@ -3542,6 +3542,15 @@ static int allocate_plane(V360Context *s, int sizeof_uv, int sizeof_ker, int siz
static void fov_from_dfov(int format, float d_fov, float w, float h, float *h_fov, float *v_fov)
{
switch (format) {
case STEREOGRAPHIC:
{
const float d = 0.5f * hypotf(w, h);
const float l = d / (tanf(d_fov * M_PI / 720.f));
*h_fov = 2.f * atan2f(w * 0.5f, l) * 360.f / M_PI;
*v_fov = 2.f * atan2f(h * 0.5f, l) * 360.f / M_PI;
}
break;
case FISHEYE:
{
const float d = 0.5f * hypotf(w, h);