virtualenv/FFmpeg
1
0
Fork 0
mirror of https://github.com/FFmpeg/FFmpeg.git synced 2024-12-23 12:43:46 +02:00
Code Issues Releases Activity

avfilter/vf_v360: allow user to control fov for equirectagular format

Browse Source 
It may be useful to use different values from typical 360/180 deg.
This commit is contained in:
Paul B Mahol 2021-04-11 00:56:44 +02:00
parent 282682a9fd
commit 1050f94c22
1 changed files with 103 additions and 11 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

114
libavfilter/vf_v360.c
View File

@ -148,8 +148,8 @@ static const AVOption v360_options[] = {
{ "pitch", "pitch rotation", OFFSET(pitch), AV_OPT_TYPE_FLOAT, {.dbl=0.f}, -180.f, 180.f,TFLAGS, "pitch"},
{ "roll", "roll rotation", OFFSET(roll), AV_OPT_TYPE_FLOAT, {.dbl=0.f}, -180.f, 180.f,TFLAGS, "roll"},
{ "rorder", "rotation order", OFFSET(rorder), AV_OPT_TYPE_STRING, {.str="ypr"}, 0, 0,TFLAGS, "rorder"},
{ "h_fov", "output horizontal field of view",OFFSET(h_fov), AV_OPT_TYPE_FLOAT, {.dbl=90.f}, 0.00001f, 360.f,TFLAGS, "h_fov"},
{ "v_fov", "output vertical field of view", OFFSET(v_fov), AV_OPT_TYPE_FLOAT, {.dbl=45.f}, 0.00001f, 360.f,TFLAGS, "v_fov"},
{ "h_fov", "output horizontal field of view",OFFSET(h_fov), AV_OPT_TYPE_FLOAT, {.dbl=0.f}, 0.f, 360.f,TFLAGS, "h_fov"},
{ "v_fov", "output vertical field of view", OFFSET(v_fov), AV_OPT_TYPE_FLOAT, {.dbl=0.f}, 0.f, 360.f,TFLAGS, "v_fov"},
{ "d_fov", "output diagonal field of view", OFFSET(d_fov), AV_OPT_TYPE_FLOAT, {.dbl=0.f}, 0.f, 360.f,TFLAGS, "d_fov"},
{ "h_flip", "flip out video horizontally", OFFSET(h_flip), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1,TFLAGS, "h_flip"},
{ "v_flip", "flip out video vertically", OFFSET(v_flip), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1,TFLAGS, "v_flip"},
@ -158,8 +158,8 @@ static const AVOption v360_options[] = {
{ "iv_flip", "flip in video vertically", OFFSET(iv_flip), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1,TFLAGS, "iv_flip"},
{ "in_trans", "transpose video input", OFFSET(in_transpose), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, FLAGS, "in_transpose"},
{ "out_trans", "transpose video output", OFFSET(out_transpose), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, FLAGS, "out_transpose"},
{ "ih_fov", "input horizontal field of view",OFFSET(ih_fov), AV_OPT_TYPE_FLOAT, {.dbl=90.f}, 0.00001f, 360.f,TFLAGS, "ih_fov"},
{ "iv_fov", "input vertical field of view", OFFSET(iv_fov), AV_OPT_TYPE_FLOAT, {.dbl=45.f}, 0.00001f, 360.f,TFLAGS, "iv_fov"},
{ "ih_fov", "input horizontal field of view",OFFSET(ih_fov), AV_OPT_TYPE_FLOAT, {.dbl=0.f}, 0.f, 360.f,TFLAGS, "ih_fov"},
{ "iv_fov", "input vertical field of view", OFFSET(iv_fov), AV_OPT_TYPE_FLOAT, {.dbl=0.f}, 0.f, 360.f,TFLAGS, "iv_fov"},
{ "id_fov", "input diagonal field of view", OFFSET(id_fov), AV_OPT_TYPE_FLOAT, {.dbl=0.f}, 0.f, 360.f,TFLAGS, "id_fov"},
{"alpha_mask", "build mask in alpha plane", OFFSET(alpha), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, FLAGS, "alpha"},
{ NULL }
@ -1728,6 +1728,23 @@ static int xyz_to_cube6x1(const V360Context *s,
return 1;
}
/**
* Prepare data for processing equirectangular output format.
*
* @param ctx filter context
*
* @return error code
*/
static int prepare_equirect_out(AVFilterContext *ctx)
{
V360Context *s = ctx->priv;
s->flat_range[0] = s->h_fov * M_PI / 360.f;
s->flat_range[1] = s->v_fov * M_PI / 360.f;
return 0;
}
/**
* Calculate 3D coordinates on sphere for corresponding frame position in equirectangular format.
*
@ -1742,8 +1759,8 @@ static int equirect_to_xyz(const V360Context *s,
int i, int j, int width, int height,
float *vec)
{
const float phi = ((2.f * i + 0.5f) / width - 1.f) * M_PI;
const float theta = ((2.f * j + 0.5f) / height - 1.f) * M_PI_2;
const float phi = ((2.f * i + 0.5f) / width - 1.f) * s->flat_range[0];
const float theta = ((2.f * j + 0.5f) / height - 1.f) * s->flat_range[1];
const float sin_phi = sinf(phi);
const float cos_phi = cosf(phi);
@ -2103,6 +2120,23 @@ static int xyz_to_orthographic(const V360Context *s,
return visible;
}
/**
* Prepare data for processing equirectangular input format.
*
* @param ctx filter context
*
* @return error code
*/
static int prepare_equirect_in(AVFilterContext *ctx)
{
V360Context *s = ctx->priv;
s->iflat_range[0] = s->ih_fov * M_PI / 360.f;
s->iflat_range[1] = s->iv_fov * M_PI / 360.f;
return 0;
}
/**
* Calculate frame position in equirectangular format for corresponding 3D coordinates on sphere.
*
@ -2122,15 +2156,18 @@ static int xyz_to_equirect(const V360Context *s,
const float phi = atan2f(vec[0], vec[2]);
const float theta = asinf(vec[1]);
const float uf = (phi / M_PI + 1.f) * width / 2.f;
const float vf = (theta / M_PI_2 + 1.f) * height / 2.f;
const float uf = (phi / s->iflat_range[0] + 1.f) * width / 2.f;
const float vf = (theta / s->iflat_range[1] + 1.f) * height / 2.f;
const int ui = floorf(uf);
const int vi = floorf(vf);
int visible;
*du = uf - ui;
*dv = vf - vi;
visible = vi >= 0 && vi < height && ui >= 0 && ui < width;
for (int i = 0; i < 4; i++) {
for (int j = 0; j < 4; j++) {
us[i][j] = ereflectx(ui + j - 1, vi + i - 1, width, height);
@ -2138,7 +2175,7 @@ static int xyz_to_equirect(const V360Context *s,
}
}
return 1;
return visible;
}
/**
@ -4003,6 +4040,10 @@ static int allocate_plane(V360Context *s, int sizeof_uv, int sizeof_ker, int siz
static void fov_from_dfov(int format, float d_fov, float w, float h, float *h_fov, float *v_fov)
{
switch (format) {
case EQUIRECTANGULAR:
*h_fov = d_fov;
*v_fov = d_fov * 0.5f;
break;
case ORTHOGRAPHIC:
{
const float d = 0.5f * hypotf(w, h);
@ -4145,6 +4186,10 @@ static int config_output(AVFilterLink *outlink)
const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
const int depth = desc->comp[0].depth;
const int sizeof_mask = s->mask_size = (depth + 7) >> 3;
float default_h_fov = 360.f;
float default_v_fov = 180.f;
float default_ih_fov = 360.f;
float default_iv_fov = 180.f;
int sizeof_uv;
int sizeof_ker;
int err;
@ -4274,6 +4319,29 @@ static int config_output(AVFilterLink *outlink)
s->in_width = s->inplanewidth[0];
s->in_height = s->inplaneheight[0];
switch (s->in) {
case CYLINDRICAL:
case FLAT:
default_ih_fov = 90.f;
default_iv_fov = 45.f;
break;
case EQUISOLID:
case ORTHOGRAPHIC:
case STEREOGRAPHIC:
case DUAL_FISHEYE:
case FISHEYE:
default_ih_fov = 180.f;
default_iv_fov = 180.f;
default:
break;
}
if (s->ih_fov == 0.f)
s->ih_fov = default_ih_fov;
if (s->iv_fov == 0.f)
s->iv_fov = default_iv_fov;
if (s->id_fov > 0.f)
fov_from_dfov(s->in, s->id_fov, w, h, &s->ih_fov, &s->iv_fov);
@ -4283,7 +4351,7 @@ static int config_output(AVFilterLink *outlink)
switch (s->in) {
case EQUIRECTANGULAR:
s->in_transform = xyz_to_equirect;
err = 0;
err = prepare_equirect_in(ctx);
wf = w;
hf = h;
break;
@ -4434,7 +4502,7 @@ static int config_output(AVFilterLink *outlink)
switch (s->out) {
case EQUIRECTANGULAR:
s->out_transform = equirect_to_xyz;
prepare_out = NULL;
prepare_out = prepare_equirect_out;
w = lrintf(wf);
h = lrintf(hf);
break;
@ -4607,6 +4675,30 @@ static int config_output(AVFilterLink *outlink)
s->width = w;
s->height = h;
switch (s->out) {
case CYLINDRICAL:
case FLAT:
default_h_fov = 90.f;
default_v_fov = 45.f;
break;
case EQUISOLID:
case ORTHOGRAPHIC:
case STEREOGRAPHIC:
case DUAL_FISHEYE:
case FISHEYE:
default_h_fov = 180.f;
default_v_fov = 180.f;
break;
default:
break;
}
if (s->h_fov == 0.f)
s->h_fov = default_h_fov;
if (s->v_fov == 0.f)
s->v_fov = default_v_fov;
if (s->d_fov > 0.f)
fov_from_dfov(s->out, s->d_fov, w, h, &s->h_fov, &s->v_fov);