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avfilter/vf_v360: fix xyz_to_mercator()

This commit is contained in:
Paul B Mahol 2019-09-22 22:31:07 +02:00
parent a8925d264a
commit 043038ea56
1 changed files with 4 additions and 4 deletions
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8
libavfilter/vf_v360.c
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@ -1555,12 +1555,12 @@ static void xyz_to_mercator(const V360Context *s,
uint16_t us[4][4], uint16_t vs[4][4], float *du, float *dv)
{
const float phi = atan2f(vec[0], -vec[2]) * s->input_mirror_modifier[0];
const float theta = 0.5f * asinhf(vec[1] / sqrtf(1.f - vec[1] * vec[1])) * s->input_mirror_modifier[1];
const float theta = -vec[1] * s->input_mirror_modifier[1];
float uf, vf;
int ui, vi;
uf = (phi / M_PI + 1.f) * width / 2.f;
vf = (theta / M_PI + 1.f) * height / 2.f;
uf = (phi / M_PI + 1.f) * width / 2.f;
vf = (av_clipf(logf((1.f + theta) / (1.f - theta)) / (2.f * M_PI), -1.f, 1.f) + 1.f) * height / 2.f;
ui = floorf(uf);
vi = floorf(vf);
@ -1569,7 +1569,7 @@ static void xyz_to_mercator(const V360Context *s,
for (int i = -1; i < 3; i++) {
for (int j = -1; j < 3; j++) {
us[i + 1][j + 1] = mod(ui + j, width);
us[i + 1][j + 1] = av_clip(ui + j, 0, width - 1);
vs[i + 1][j + 1] = av_clip(vi + i, 0, height - 1);
}
}