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avfilter/vf_v360: add cubemap 1x6 layout

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This commit is contained in:
Paul B Mahol 2019-08-31 14:52:32 +02:00
parent 07b948fe60
commit c79d6728a7
2 changed files with 123 additions and 1 deletions
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3
doc/filters.texi
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@ -17932,7 +17932,8 @@ Equirectangular projection.
@item c3x2
@item c6x1
Cubemap with 3x2/6x1 layout.
@item c1x6
Cubemap with 3x2/6x1/1x6 layout.
Format specific options:

121
libavfilter/vf_v360.c
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@ -49,6 +49,7 @@ enum Projections {
FLAT,
DUAL_FISHEYE,
FACEBOOK,
CUBEMAP_1_6,
NB_PROJECTIONS,
};
@ -139,6 +140,7 @@ static const AVOption v360_options[] = {
{ "eac", "equi-angular", 0, AV_OPT_TYPE_CONST, {.i64=EQUIANGULAR}, 0, 0, FLAGS, "in" },
{ "dfisheye", "dual fisheye", 0, AV_OPT_TYPE_CONST, {.i64=DUAL_FISHEYE}, 0, 0, FLAGS, "in" },
{ "fb", "facebook's 360 format", 0, AV_OPT_TYPE_CONST, {.i64=FACEBOOK}, 0, 0, FLAGS, "in" },
{ "c1x6", "cubemap1x6", 0, AV_OPT_TYPE_CONST, {.i64=CUBEMAP_1_6}, 0, 0, FLAGS, "in" },
{ "output", "set output projection", OFFSET(out), AV_OPT_TYPE_INT, {.i64=CUBEMAP_3_2}, 0, NB_PROJECTIONS-1, FLAGS, "out" },
{ "e", "equirectangular", 0, AV_OPT_TYPE_CONST, {.i64=EQUIRECTANGULAR}, 0, 0, FLAGS, "out" },
{ "c3x2", "cubemap3x2", 0, AV_OPT_TYPE_CONST, {.i64=CUBEMAP_3_2}, 0, 0, FLAGS, "out" },
@ -146,6 +148,7 @@ static const AVOption v360_options[] = {
{ "eac", "equi-angular", 0, AV_OPT_TYPE_CONST, {.i64=EQUIANGULAR}, 0, 0, FLAGS, "out" },
{ "flat", "regular video", 0, AV_OPT_TYPE_CONST, {.i64=FLAT}, 0, 0, FLAGS, "out" },
{ "fb", "facebook's 360 format", 0, AV_OPT_TYPE_CONST, {.i64=FACEBOOK}, 0, 0, FLAGS, "out" },
{ "c1x6", "cubemap1x6", 0, AV_OPT_TYPE_CONST, {.i64=CUBEMAP_1_6}, 0, 0, FLAGS, "out" },
{ "interp", "set interpolation method", OFFSET(interp), AV_OPT_TYPE_INT, {.i64=BILINEAR}, 0, NB_INTERP_METHODS-1, FLAGS, "interp" },
{ "near", "nearest neighbour", 0, AV_OPT_TYPE_CONST, {.i64=NEAREST}, 0, 0, FLAGS, "interp" },
{ "nearest", "nearest neighbour", 0, AV_OPT_TYPE_CONST, {.i64=NEAREST}, 0, 0, FLAGS, "interp" },
@ -1164,6 +1167,34 @@ static void xyz_to_cube3x2(const V360Context *s,
}
}
/**
* Calculate 3D coordinates on sphere for corresponding frame position in cubemap1x6 format.
*
* @param s filter context
* @param i horizontal position on frame [0, height)
* @param j vertical position on frame [0, width)
* @param width frame width
* @param height frame height
* @param vec coordinates on sphere
*/
static void cube1x6_to_xyz(const V360Context *s,
int i, int j, int width, int height,
float *vec)
{
const float ew = width;
const float eh = height / 6.f;
const int face = floorf(j / eh);
const int v_shift = ceilf(eh * face);
const int ehi = ceilf(eh * (face + 1)) - v_shift;
const float uf = 2.f * i / ew - 1.f;
const float vf = 2.f * (j - v_shift) / ehi - 1.f;
cube_to_xyz(s, uf, vf, face, vec);
}
/**
* Calculate 3D coordinates on sphere for corresponding frame position in cubemap6x1 format.
*
@ -1192,6 +1223,84 @@ static void cube6x1_to_xyz(const V360Context *s,
cube_to_xyz(s, uf, vf, face, vec);
}
/**
* Calculate frame position in cubemap1x6 format for corresponding 3D coordinates on sphere.
*
* @param s filter context
* @param vec coordinates on sphere
* @param width frame width
* @param height frame height
* @param us horizontal coordinates for interpolation window
* @param vs vertical coordinates for interpolation window
* @param du horizontal relative coordinate
* @param dv vertical relative coordinate
*/
static void xyz_to_cube1x6(const V360Context *s,
const float *vec, int width, int height,
uint16_t us[4][4], uint16_t vs[4][4], float *du, float *dv)
{
const float eh = height / 6.f;
const int ewi = width;
float uf, vf;
int ui, vi;
int ehi;
int i, j;
int direction, face;
xyz_to_cube(s, vec, &uf, &vf, &direction);
uf *= (1.f - s->in_pad);
vf *= (1.f - s->in_pad);
face = s->in_cubemap_face_order[direction];
ehi = ceilf(eh * (face + 1)) - ceilf(eh * face);
uf = 0.5f * ewi * (uf + 1.f);
vf = 0.5f * ehi * (vf + 1.f);
ui = floorf(uf);
vi = floorf(vf);
*du = uf - ui;
*dv = vf - vi;
for (i = -1; i < 3; i++) {
for (j = -1; j < 3; j++) {
int new_ui = ui + j;
int new_vi = vi + i;
int v_shift;
int new_ehi;
if (new_ui >= 0 && new_ui < ewi && new_vi >= 0 && new_vi < ehi) {
face = s->in_cubemap_face_order[direction];
v_shift = ceilf(eh * face);
} else {
uf = 2.f * new_ui / ewi - 1.f;
vf = 2.f * new_vi / ehi - 1.f;
uf /= (1.f - s->in_pad);
vf /= (1.f - s->in_pad);
process_cube_coordinates(s, uf, vf, direction, &uf, &vf, &face);
uf *= (1.f - s->in_pad);
vf *= (1.f - s->in_pad);
v_shift = ceilf(eh * face);
new_ehi = ceilf(eh * (face + 1)) - v_shift;
new_ui = av_clip(roundf(0.5f * ewi * (uf + 1.f)), 0, ewi - 1);
new_vi = av_clip(roundf(0.5f * new_ehi * (vf + 1.f)), 0, new_ehi - 1);
}
us[i + 1][j + 1] = new_ui;
vs[i + 1][j + 1] = v_shift + new_vi;
}
}
}
/**
* Calculate frame position in cubemap6x1 format for corresponding 3D coordinates on sphere.
*
@ -1918,6 +2027,12 @@ static int config_output(AVFilterLink *outlink)
wf = inlink->w / 3.f * 4.f;
hf = inlink->h;
break;
case CUBEMAP_1_6:
in_transform = xyz_to_cube1x6;
err = prepare_cube_in(ctx);
wf = inlink->w * 4.f;
hf = inlink->h / 3.f;
break;
case CUBEMAP_6_1:
in_transform = xyz_to_cube6x1;
err = prepare_cube_in(ctx);
@ -1967,6 +2082,12 @@ static int config_output(AVFilterLink *outlink)
w = roundf(wf / 4.f * 3.f);
h = roundf(hf);
break;
case CUBEMAP_1_6:
out_transform = cube1x6_to_xyz;
err = prepare_cube_out(ctx);
w = roundf(wf / 4.f);
h = roundf(hf * 3.f);
break;
case CUBEMAP_6_1:
out_transform = cube6x1_to_xyz;
err = prepare_cube_out(ctx);