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avfilter/vf_v360: speed up fisheye input calculation

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This commit is contained in:
Paul B Mahol 2020-02-29 16:39:35 +01:00
parent 2dfd9445ff
commit 3733a6bc20
1 changed files with 5 additions and 4 deletions
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9
libavfilter/vf_v360.c
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@ -2484,11 +2484,12 @@ static int xyz_to_fisheye(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 phi = -atan2f(hypotf(vec[0], vec[1]), -vec[2]) / M_PI;
const float theta = -atan2f(vec[0], vec[1]);
const float h = hypotf(vec[0], vec[1]);
const float lh = h > 0.f ? h : 1.f;
const float phi = atan2f(h, -vec[2]) / M_PI;
float uf = sinf(theta) * phi * s->input_mirror_modifier[0] / s->iflat_range[0];
float vf = cosf(theta) * phi * s->input_mirror_modifier[1] / s->iflat_range[1];
float uf = vec[0] / lh * phi * s->input_mirror_modifier[0] / s->iflat_range[0];
float vf = -vec[1] / lh * phi * s->input_mirror_modifier[1] / s->iflat_range[1];
const int visible = hypotf(uf, vf) <= 0.5f;
int ui, vi;