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avfilter/vf_v360: improve sg input format 

Specifically unbreak yaw functionality.
This commit is contained in:
Paul B Mahol 2020-03-26 13:53:22 +01:00
parent 7931e766ad
commit 840e92da17
1 changed files with 5 additions and 2 deletions
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7
libavfilter/vf_v360.c
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@ -1742,8 +1742,11 @@ static int xyz_to_stereographic(const V360Context *s,
const float *vec, int width, int height,
int16_t us[4][4], int16_t vs[4][4], float *du, float *dv)
{
const float x = vec[0] / (1.f - vec[1]) / s->iflat_range[0] * s->input_mirror_modifier[0];
const float y = vec[2] / (1.f - vec[1]) / s->iflat_range[1] * s->input_mirror_modifier[1];
const float theta = acosf(-vec[2]);
const float r = tanf(theta * 0.5f);
const float c = r / hypotf(vec[0], vec[1]);
const float x = vec[0] * c / s->iflat_range[0] * s->input_mirror_modifier[0];
const float y = -vec[1] * c / s->iflat_range[1] * s->input_mirror_modifier[1];
const float uf = (x + 1.f) * width / 2.f;
const float vf = (y + 1.f) * height / 2.f;