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avfilter/vf_v360: improve sg output format

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This commit is contained in:
Paul B Mahol 2020-03-26 13:37:13 +01:00
parent b5dd964cdc
commit 7931e766ad
1 changed files with 6 additions and 4 deletions
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10
libavfilter/vf_v360.c
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@ -1696,11 +1696,13 @@ static int stereographic_to_xyz(const V360Context *s,
{
const float x = ((2.f * i + 1.f) / width - 1.f) * s->flat_range[0];
const float y = ((2.f * j + 1.f) / height - 1.f) * s->flat_range[1];
const float xy = x * x + y * y;
const float r = hypotf(x, y);
const float theta = atanf(r) * 2.f;
const float sin_theta = sinf(theta);
vec[0] = 2.f * x / (1.f + xy);
vec[1] = (-1.f + xy) / (1.f + xy);
vec[2] = 2.f * y / (1.f + xy);
vec[0] = x / r * sin_theta;
vec[1] = -y / r * sin_theta;
vec[2] = -cosf(theta);
normalize_vector(vec);