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avfilter/vf_v360: improve fisheye input format

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This commit is contained in:
Paul B Mahol 2020-01-22 12:23:58 +01:00
parent 2bae3da79e
commit a00fa73f47
1 changed files with 11 additions and 10 deletions
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21
libavfilter/vf_v360.c
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@ -2379,22 +2379,23 @@ static void 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 h = hypotf(vec[0], vec[1]);
const float lh = h > 0.f ? h : 1.f;
const float theta = acosf(fabsf(vec[2])) / M_PI;
const float phi = -atan2f(hypotf(vec[0], vec[1]), -vec[2]) / M_PI;
const float theta = -atan2f(vec[0], vec[1]);
const float uf = (theta * ( vec[0] / lh) * s->input_mirror_modifier[0] / s->iflat_range[0] + 0.5f) * width;
const float vf = (theta * (-vec[1] / lh) * s->input_mirror_modifier[1] / s->iflat_range[1] + 0.5f) * height;
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];
int visible, ui, vi;
const int visible = hypotf(uf, vf) <= 0.5f;
int ui, vi;
uf = (uf + 0.5f) * width;
vf = (vf + 0.5f) * height;
ui = floorf(uf);
vi = floorf(vf);
visible = vec[2] < 0.f;
*du = uf - ui;
*dv = vf - vi;
*du = visible ? uf - ui : 0.f;
*dv = visible ? vf - vi : 0.f;
for (int i = -1; i < 3; i++) {
for (int j = -1; j < 3; j++) {