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avfilter/vf_v360: add barrel split format output support

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This commit is contained in:
Paul B Mahol 2020-02-26 14:37:39 +01:00
parent 828f7db5d9
commit b0a9960a77
3 changed files with 98 additions and 1 deletions
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3
doc/filters.texi
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@ -18932,7 +18932,8 @@ Default value is @b{@samp{0}}.
@item barrel
@item fb
Facebook's 360 format.
@item barrelsplit
Facebook's 360 formats.
@item sg
Stereographic format.

1
libavfilter/v360.h
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@ -48,6 +48,7 @@ enum Projections {
CYLINDRICAL,
PERSPECTIVE,
TETRAHEDRON,
BARREL_SPLIT,
NB_PROJECTIONS,
};

95
libavfilter/vf_v360.c
View File

@ -99,6 +99,7 @@ static const AVOption v360_options[] = {
{"cylindrical", "cylindrical", 0, AV_OPT_TYPE_CONST, {.i64=CYLINDRICAL}, 0, 0, FLAGS, "out" },
{"perspective", "perspective", 0, AV_OPT_TYPE_CONST, {.i64=PERSPECTIVE}, 0, 0, FLAGS, "out" },
{"tetrahedron", "tetrahedron", 0, AV_OPT_TYPE_CONST, {.i64=TETRAHEDRON}, 0, 0, FLAGS, "out" },
{"barrelsplit", "barrel split facebook's 360 format", 0, AV_OPT_TYPE_CONST, {.i64=BARREL_SPLIT}, 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" },
@ -2997,6 +2998,93 @@ static int xyz_to_barrel(const V360Context *s,
return 1;
}
/**
* Calculate 3D coordinates on sphere for corresponding frame position in barrel split facebook's format.
*
* @param s filter private context
* @param i horizontal position on frame [0, width)
* @param j vertical position on frame [0, height)
* @param width frame width
* @param height frame height
* @param vec coordinates on sphere
*/
static int barrelsplit_to_xyz(const V360Context *s,
int i, int j, int width, int height,
float *vec)
{
const float scale = 1.01f;
const float x = (i + 0.5f) / width;
const float y = (j + 0.5f) / height;
float l_x, l_y, l_z;
if (x <= 2.f / 3.f) {
const float back = floorf(y * 2.f);
const float phi = ((3.f / 2.f * x - 0.5f) * scale - back + 1.f) * M_PI;
const float theta = (y - 0.25f - 0.5f * back) * scale * M_PI;
const float sin_phi = sinf(phi);
const float cos_phi = cosf(phi);
const float sin_theta = sinf(theta);
const float cos_theta = cosf(theta);
l_x = -cos_theta * sin_phi;
l_y = -sin_theta;
l_z = cos_theta * cos_phi;
} else {
const int face = floorf(y * 4.f);
float uf, vf;
uf = x * 3.f - 2.f;
uf = (uf - 0.5f) * scale + 0.5f;
switch (face) {
case 0:
vf = y * 2.f;
uf = 1.f - uf;
vf = (0.5f - vf) * scale;
l_x = 0.5f - uf;
l_y = 0.5f;
l_z = -0.5f + vf;
break;
case 1:
vf = y * 2.f;
uf = 1.f - uf;
vf = 1.f - (vf - 0.5f) * scale;
l_x = 0.5f - uf;
l_y = -0.5f;
l_z = 0.5f - vf;
break;
case 2:
vf = y * 2.f - 0.5f;
vf = 1.f - (1.f - vf) * scale;
l_x = 0.5f - uf;
l_y = 0.5f;
l_z = -0.5f + vf;
break;
case 3:
vf = y * 2.f - 1.5f;
vf = vf * scale;
l_x = 0.5f - uf;
l_y = -0.5f;
l_z = 0.5f - vf;
break;
}
}
vec[0] = l_x;
vec[1] = l_y;
vec[2] = l_z;
normalize_vector(vec);
return 1;
}
static void multiply_matrix(float c[3][3], const float a[3][3], const float b[3][3])
{
for (int i = 0; i < 3; i++) {
@ -3368,6 +3456,7 @@ static int config_output(AVFilterLink *outlink)
wf = w;
hf = h;
break;
case BARREL_SPLIT:
case PERSPECTIVE:
case PANNINI:
av_log(ctx, AV_LOG_ERROR, "Supplied format is not accepted as input.\n");
@ -3550,6 +3639,12 @@ static int config_output(AVFilterLink *outlink)
w = lrintf(wf);
h = lrintf(hf);
break;
case BARREL_SPLIT:
s->out_transform = barrelsplit_to_xyz;
prepare_out = NULL;
w = lrintf(wf / 4.f * 3.f);
h = lrintf(hf);
break;
default:
av_log(ctx, AV_LOG_ERROR, "Specified output format is not handled.\n");
return AVERROR_BUG;