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avfilter/vf_v360: add initial barrel split format input support

This commit is contained in:
Paul B Mahol 2020-02-26 21:23:59 +01:00
parent a2c97a8342
commit 9b22254331
1 changed files with 128 additions and 20 deletions
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148
libavfilter/vf_v360.c
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@ -76,6 +76,7 @@ static const AVOption v360_options[] = {
{ "fisheye", "fisheye", 0, AV_OPT_TYPE_CONST, {.i64=FISHEYE}, 0, 0, FLAGS, "in" },
{"cylindrical", "cylindrical", 0, AV_OPT_TYPE_CONST, {.i64=CYLINDRICAL}, 0, 0, FLAGS, "in" },
{"tetrahedron", "tetrahedron", 0, AV_OPT_TYPE_CONST, {.i64=TETRAHEDRON}, 0, 0, FLAGS, "in" },
{"barrelsplit", "barrel split facebook's 360 format", 0, AV_OPT_TYPE_CONST, {.i64=BARREL_SPLIT}, 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" },
{ "equirect", "equirectangular", 0, AV_OPT_TYPE_CONST, {.i64=EQUIRECTANGULAR}, 0, 0, FLAGS, "out" },
@ -2892,7 +2893,7 @@ static int barrel_to_xyz(const V360Context *s,
float uf, vf;
if (j < eh) { // UP
uf = 2.f * (i - 4 * ew) / ew - 1.f;
uf = 2.f * (i - 4 * ew) / ew - 1.f;
vf = 2.f * (j ) / eh - 1.f;
uf /= scale;
@ -2998,6 +2999,105 @@ static int xyz_to_barrel(const V360Context *s,
return 1;
}
/**
* Calculate frame position in barrel split facebook's format for corresponding 3D coordinates on sphere.
*
* @param s filter private 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 int xyz_to_barrelsplit(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 phi = atan2f(vec[0], -vec[2]) * s->input_mirror_modifier[0];
const float theta = asinf(-vec[1]) * s->input_mirror_modifier[1];
const float theta_range = M_PI_4;
int ew, eh;
int u_shift, v_shift;
float uf, vf;
int ui, vi;
if (theta >= -theta_range && theta <= theta_range) {
const float scalew = s->fin_pad > 0 ? 1.f - s->fin_pad / (width * 2.f / 3.f) : 1.f - s->in_pad;
const float scaleh = s->fin_pad > 0 ? 1.f - s->fin_pad / (height / 2.f) : 1.f - s->in_pad;
ew = width / 3 * 2;
eh = height / 2;
u_shift = s->ih_flip ? width / 3 : 0;
v_shift = phi >= M_PI_2 || phi < -M_PI_2 ? eh : 0;
uf = fmodf(phi, M_PI_2) / M_PI_2;
vf = theta / M_PI_4;
if (v_shift)
uf = uf >= 0.f ? fmodf(uf - 1.f, 1.f) : fmodf(uf + 1.f, 1.f);
uf = (uf * scalew + 1.f) * width / 3.f;
vf = (vf * scaleh + 1.f) * height / 4.f;
} else {
const float scalew = s->fin_pad > 0 ? 1.f - s->fin_pad / (width / 3.f) : 1.f - s->in_pad;
const float scaleh = s->fin_pad > 0 ? 1.f - s->fin_pad / (height / 4.f) : 1.f - s->in_pad;
int v_offset = 0;
ew = width / 3;
eh = height / 4;
u_shift = s->ih_flip ? 0 : 2 * ew;
if (theta <= 0.f && theta >= -M_PI_2 &&
phi <= M_PI_2 && phi >= -M_PI_2) {
uf = vec[0] / vec[1];
vf = -vec[2] / vec[1];
v_shift = 0;
v_offset = -eh;
} else if (theta >= 0.f && theta <= M_PI_2 &&
phi <= M_PI_2 && phi >= -M_PI_2) {
uf = -vec[0] / vec[1];
vf = -vec[2] / vec[1];
v_shift = height * 0.25f;
} else if (theta <= 0.f && theta >= -M_PI_2) {
uf = -vec[0] / vec[1];
vf = vec[2] / vec[1];
v_shift = height * 0.5f;
v_offset = -eh;
} else {
uf = vec[0] / vec[1];
vf = vec[2] / vec[1];
v_shift = height * 0.75f;
}
uf *= s->input_mirror_modifier[0] * s->input_mirror_modifier[1];
vf *= s->input_mirror_modifier[1];
uf = 0.5f * width / 3.f * (uf * scalew + 1.f);
vf = height * 0.25f * (vf * scaleh + 1.f) + v_offset;
}
ui = floorf(uf);
vi = floorf(vf);
*du = uf - ui;
*dv = vf - vi;
for (int i = -1; i < 3; i++) {
for (int j = -1; j < 3; j++) {
us[i + 1][j + 1] = u_shift + av_clip(ui + j, 0, ew - 1);
vs[i + 1][j + 1] = v_shift + av_clip(vi + i, 0, eh - 1);
}
}
return 1;
}
/**
* Calculate 3D coordinates on sphere for corresponding frame position in barrel split facebook's format.
*
@ -3012,16 +3112,18 @@ 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) {
if (x < 2.f / 3.f) {
const float scalew = s->fout_pad > 0 ? 1.f - s->fout_pad / (width * 2.f / 3.f) : 1.f - s->out_pad;
const float scaleh = s->fout_pad > 0 ? 1.f - s->fout_pad / (height / 2.f) : 1.f - s->out_pad;
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 phi = ((3.f / 2.f * x - 0.5f) / scalew - back + 1.f) * M_PI;
const float theta = (y - 0.25f - 0.5f * back) / scaleh * M_PI;
const float sin_phi = sinf(phi);
const float cos_phi = cosf(phi);
@ -3032,46 +3134,47 @@ static int barrelsplit_to_xyz(const V360Context *s,
l_y = -sin_theta;
l_z = cos_theta * cos_phi;
} else {
const float scalew = s->fout_pad > 0 ? 1.f - s->fout_pad / (width / 3.f) : 1.f - s->out_pad;
const float scaleh = s->fout_pad > 0 ? 1.f - s->fout_pad / (height / 4.f) : 1.f - s->out_pad;
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;
vf = 0.5f - vf;
l_x = 0.5f - uf;
l_x = (0.5f - uf) / scalew;
l_y = 0.5f;
l_z = -0.5f + vf;
l_z = (-0.5f + vf) / scaleh;
break;
case 1:
vf = y * 2.f;
uf = 1.f - uf;
vf = 1.f - (vf - 0.5f) * scale;
vf = 1.f - (vf - 0.5f);
l_x = 0.5f - uf;
l_x = (0.5f - uf) / scalew;
l_y = -0.5f;
l_z = 0.5f - vf;
l_z = (0.5f - vf) / scaleh;
break;
case 2:
vf = y * 2.f - 0.5f;
vf = 1.f - (1.f - vf) * scale;
vf = 1.f - (1.f - vf);
l_x = 0.5f - uf;
l_y = 0.5f;
l_z = -0.5f + vf;
l_x = (0.5f - uf) / scalew;
l_y = 0.5f;
l_z = (-0.5f + vf) / scaleh;
break;
case 3:
vf = y * 2.f - 1.5f;
vf = vf * scale;
l_x = 0.5f - uf;
l_x = (0.5f - uf) / scalew;
l_y = -0.5f;
l_z = 0.5f - vf;
l_z = (0.5f - vf) / scaleh;
break;
}
}
@ -3456,7 +3559,6 @@ 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");
@ -3521,6 +3623,12 @@ static int config_output(AVFilterLink *outlink)
wf = w;
hf = h;
break;
case BARREL_SPLIT:
s->in_transform = xyz_to_barrelsplit;
err = 0;
wf = w * 4.f / 3.f;
hf = h;
break;
default:
av_log(ctx, AV_LOG_ERROR, "Specified input format is not handled.\n");
return AVERROR_BUG;