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avfilter/vf_v360: add support for input fov to input sg format

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This commit is contained in:
Paul B Mahol 2020-01-21 11:23:00 +01:00
parent 003a9c619c
commit fc2523c792
2 changed files with 36 additions and 10 deletions
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11
doc/filters.texi
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@ -18961,7 +18961,14 @@ Format specific options:
@item h_fov
@item v_fov
@item d_fov
Set horizontal/vertical/diagonal field of view. Values in degrees.
Set output horizontal/vertical/diagonal field of view. Values in degrees.
If diagonal field of view is set it overrides horizontal and vertical field of view.
@item ih_fov
@item iv_fov
@item id_fov
Set input horizontal/vertical/diagonal field of view. Values in degrees.
If diagonal field of view is set it overrides horizontal and vertical field of view.
@end table
@ -19008,7 +19015,7 @@ Format specific options:
@item h_fov
@item v_fov
@item d_fov
Set horizontal/vertical/diagonal field of view. Values in degrees.
Set output horizontal/vertical/diagonal field of view. Values in degrees.
If diagonal field of view is set it overrides horizontal and vertical field of view.

35
libavfilter/vf_v360.c
View File

@ -1581,6 +1581,23 @@ static void stereographic_to_xyz(const V360Context *s,
normalize_vector(vec);
}
/**
* Prepare data for processing stereographic input format.
*
* @param ctx filter context
*
* @return error code
*/
static int prepare_stereographic_in(AVFilterContext *ctx)
{
V360Context *s = ctx->priv;
s->iflat_range[0] = tanf(FFMIN(s->ih_fov, 359.f) * M_PI / 720.f);
s->iflat_range[1] = tanf(FFMIN(s->iv_fov, 359.f) * M_PI / 720.f);
return 0;
}
/**
* Calculate frame position in stereographic format for corresponding 3D coordinates on sphere.
*
@ -1597,23 +1614,25 @@ static void 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 = av_clipf(vec[0] / (1.f - vec[1]), -1.f, 1.f) * s->input_mirror_modifier[0];
const float y = av_clipf(vec[2] / (1.f - vec[1]), -1.f, 1.f) * s->input_mirror_modifier[1];
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];
float uf, vf;
int ui, vi;
int visible, ui, vi;
uf = (x + 1.f) * width / 2.f;
vf = (y + 1.f) * height / 2.f;
ui = floorf(uf);
vi = floorf(vf);
*du = uf - ui;
*dv = vf - vi;
visible = isfinite(x) && isfinite(y) && vi >= 0 && vi < height && ui >= 0 && ui < width;
*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++) {
us[i + 1][j + 1] = av_clip(ui + j, 0, width - 1);
vs[i + 1][j + 1] = av_clip(vi + i, 0, height - 1);
us[i + 1][j + 1] = visible ? av_clip(ui + j, 0, width - 1) : 0;
vs[i + 1][j + 1] = visible ? av_clip(vi + i, 0, height - 1) : 0;
}
}
}
@ -3088,7 +3107,7 @@ static int config_output(AVFilterLink *outlink)
break;
case STEREOGRAPHIC:
s->in_transform = xyz_to_stereographic;
err = 0;
err = prepare_stereographic_in(ctx);
wf = w;
hf = h / 2.f;
break;