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avfilter/vf_v360: refactor rescaling of i/j

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This commit is contained in:
Paul B Mahol 2021-08-22 13:42:08 +02:00
parent 252128561e
commit 1616f7fb28
1 changed files with 57 additions and 52 deletions
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109
libavfilter/vf_v360.c
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@ -1373,6 +1373,11 @@ static void process_cube_coordinates(const V360Context *s,
rotate_cube_face(new_uf, new_vf, s->in_cubemap_face_rotation[*face]);
}
static av_always_inline float rescale(int x, int s)
{
return (2.f * x + 1.f) / s - 1.f;
}
/**
* Calculate 3D coordinates on sphere for corresponding frame position in cubemap3x2 format.
*
@ -1402,8 +1407,8 @@ static int cube3x2_to_xyz(const V360Context *s,
const int ewi = ceilf(ew * (u_face + 1)) - u_shift;
const int ehi = ceilf(eh * (v_face + 1)) - v_shift;
const float uf = 2.f * (i - u_shift + 0.5f) / ewi - 1.f;
const float vf = 2.f * (j - v_shift + 0.5f) / ehi - 1.f;
const float uf = rescale(i - u_shift, ewi);
const float vf = rescale(j - v_shift, ehi);
cube_to_xyz(s, uf, vf, face, vec, scalew, scaleh);
@ -1526,8 +1531,8 @@ static int cube1x6_to_xyz(const V360Context *s,
const int v_shift = ceilf(eh * face);
const int ehi = ceilf(eh * (face + 1)) - v_shift;
const float uf = 2.f * (i + 0.5f) / ew - 1.f;
const float vf = 2.f * (j - v_shift + 0.5f) / ehi - 1.f;
const float uf = rescale(i, ew);
const float vf = rescale(j - v_shift, ehi);
cube_to_xyz(s, uf, vf, face, vec, scalew, scaleh);
@ -1559,8 +1564,8 @@ static int cube6x1_to_xyz(const V360Context *s,
const int u_shift = ceilf(ew * face);
const int ewi = ceilf(ew * (face + 1)) - u_shift;
const float uf = 2.f * (i - u_shift + 0.5f) / ewi - 1.f;
const float vf = 2.f * (j + 0.5f) / eh - 1.f;
const float uf = rescale(i - u_shift, ewi);
const float vf = rescale(j, eh);
cube_to_xyz(s, uf, vf, face, vec, scalew, scaleh);
@ -1758,8 +1763,8 @@ 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) * s->flat_range[0];
const float theta = ((2.f * j + 0.5f) / height - 1.f) * s->flat_range[1];
const float phi = rescale(i, width) * s->flat_range[0];
const float theta = rescale(j, height) * s->flat_range[1];
const float sin_phi = sinf(phi);
const float cos_phi = cosf(phi);
@ -1787,8 +1792,8 @@ static int hequirect_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_2;
const float theta = ((2.f * j + 0.5f) / height - 1.f) * M_PI_2;
const float phi = rescale(i, width) * M_PI_2;
const float theta = rescale(j, height) * M_PI_2;
const float sin_phi = sinf(phi);
const float cos_phi = cosf(phi);
@ -1833,8 +1838,8 @@ static int stereographic_to_xyz(const V360Context *s,
int i, int j, int width, int height,
float *vec)
{
const float x = ((2.f * i + 1.f) / width - 1.f) * s->flat_range[0];
const float y = ((2.f * j + 1.f) / height - 1.f) * s->flat_range[1];
const float x = rescale(i, width) * s->flat_range[0];
const float y = rescale(j, height) * s->flat_range[1];
const float r = hypotf(x, y);
const float theta = atanf(r) * 2.f;
const float sin_theta = sinf(theta);
@ -1939,8 +1944,8 @@ static int equisolid_to_xyz(const V360Context *s,
int i, int j, int width, int height,
float *vec)
{
const float x = ((2.f * i + 1.f) / width - 1.f) * s->flat_range[0];
const float y = ((2.f * j + 1.f) / height - 1.f) * s->flat_range[1];
const float x = rescale(i, width) * s->flat_range[0];
const float y = rescale(j, height) * s->flat_range[1];
const float r = hypotf(x, y);
const float theta = asinf(r) * 2.f;
const float sin_theta = sinf(theta);
@ -2045,8 +2050,8 @@ static int orthographic_to_xyz(const V360Context *s,
int i, int j, int width, int height,
float *vec)
{
const float x = ((2.f * i + 1.f) / width - 1.f) * s->flat_range[0];
const float y = ((2.f * j + 1.f) / height - 1.f) * s->flat_range[1];
const float x = rescale(i, width) * s->flat_range[0];
const float y = rescale(j, height) * s->flat_range[1];
const float r = hypotf(x, y);
const float theta = asinf(r);
@ -2155,8 +2160,8 @@ 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 / s->iflat_range[0] + 1.f) * width / 2.f;
const float vf = (theta / s->iflat_range[1] + 1.f) * height / 2.f;
const float uf = (phi / s->iflat_range[0] + 1.f) * width / 2.f - 0.5f;
const float vf = (theta / s->iflat_range[1] + 1.f) * height / 2.f - 0.5f;
const int ui = floorf(uf);
const int vi = floorf(vf);
@ -2333,8 +2338,8 @@ static int mercator_to_xyz(const V360Context *s,
int i, int j, int width, int height,
float *vec)
{
const float phi = ((2.f * i + 1.f) / width - 1.f) * M_PI + M_PI_2;
const float y = ((2.f * j + 1.f) / height - 1.f) * M_PI;
const float phi = rescale(i, width) * M_PI + M_PI_2;
const float y = rescale(j, height) * M_PI;
const float div = expf(2.f * y) + 1.f;
const float sin_phi = sinf(phi);
@ -2401,8 +2406,8 @@ static int ball_to_xyz(const V360Context *s,
int i, int j, int width, int height,
float *vec)
{
const float x = (2.f * i + 1.f) / width - 1.f;
const float y = (2.f * j + 1.f) / height - 1.f;
const float x = rescale(i, width);
const float y = rescale(j, height);
const float l = hypotf(x, y);
if (l <= 1.f) {
@ -2435,8 +2440,8 @@ static int hammer_to_xyz(const V360Context *s,
int i, int j, int width, int height,
float *vec)
{
const float x = ((2.f * i + 1.f) / width - 1.f);
const float y = ((2.f * j + 1.f) / height - 1.f);
const float x = rescale(i, width);
const float y = rescale(j, height);
const float xx = x * x;
const float yy = y * y;
@ -2515,8 +2520,8 @@ static int sinusoidal_to_xyz(const V360Context *s,
int i, int j, int width, int height,
float *vec)
{
const float theta = ((2.f * j + 1.f) / height - 1.f) * M_PI_2;
const float phi = ((2.f * i + 1.f) / width - 1.f) * M_PI / cosf(theta);
const float theta = rescale(j, height) * M_PI_2;
const float phi = rescale(i, width) * M_PI / cosf(theta);
const float sin_phi = sinf(phi);
const float cos_phi = cosf(phi);
@ -2820,8 +2825,8 @@ static int flat_to_xyz(const V360Context *s,
int i, int j, int width, int height,
float *vec)
{
const float l_x = s->flat_range[0] * ((2.f * i + 0.5f) / width - 1.f);
const float l_y = s->flat_range[1] * ((2.f * j + 0.5f) / height - 1.f);
const float l_x = s->flat_range[0] * rescale(i, width);
const float l_y = s->flat_range[1] * rescale(j, height);
vec[0] = l_x;
vec[1] = l_y;
@ -2863,8 +2868,8 @@ static int fisheye_to_xyz(const V360Context *s,
int i, int j, int width, int height,
float *vec)
{
const float uf = s->flat_range[0] * ((2.f * i) / width - 1.f);
const float vf = s->flat_range[1] * ((2.f * j + 1.f) / height - 1.f);
const float uf = s->flat_range[0] * rescale(i, width);
const float vf = s->flat_range[1] * rescale(j, height);
const float phi = atan2f(vf, uf);
const float theta = M_PI_2 * (1.f - hypotf(uf, vf));
@ -2959,8 +2964,8 @@ static int pannini_to_xyz(const V360Context *s,
int i, int j, int width, int height,
float *vec)
{
const float uf = ((2.f * i + 1.f) / width - 1.f);
const float vf = ((2.f * j + 1.f) / height - 1.f);
const float uf = rescale(i, width);
const float vf = rescale(j, height);
const float d = s->h_fov;
const float k = uf * uf / ((d + 1.f) * (d + 1.f));
@ -3004,8 +3009,8 @@ static int xyz_to_pannini(const V360Context *s,
const float x = S * sinf(phi);
const float y = S * tanf(theta);
const float uf = (x + 1.f) * width / 2.f;
const float vf = (y + 1.f) * height / 2.f;
const float uf = (x + 1.f) * width / 2.f - 0.5f;
const float vf = (y + 1.f) * height / 2.f - 0.5f;
const int ui = floorf(uf);
const int vi = floorf(vf);
@ -3056,8 +3061,8 @@ static int cylindrical_to_xyz(const V360Context *s,
int i, int j, int width, int height,
float *vec)
{
const float uf = s->flat_range[0] * ((2.f * i + 1.f) / width - 1.f);
const float vf = s->flat_range[1] * ((2.f * j + 1.f) / height - 1.f);
const float uf = s->flat_range[0] * rescale(i, width);
const float vf = s->flat_range[1] * rescale(j, height);
const float phi = uf;
const float theta = atanf(vf);
@ -3183,8 +3188,8 @@ static int cylindricalea_to_xyz(const V360Context *s,
int i, int j, int width, int height,
float *vec)
{
const float uf = s->flat_range[0] * ((2.f * i + 1.f) / width - 1.f);
const float vf = s->flat_range[1] * ((2.f * j + 1.f) / height - 1.f);
const float uf = s->flat_range[0] * rescale(i, width);
const float vf = s->flat_range[1] * rescale(j, height);
const float phi = uf;
const float theta = asinf(vf);
@ -3259,8 +3264,8 @@ static int perspective_to_xyz(const V360Context *s,
int i, int j, int width, int height,
float *vec)
{
const float uf = ((2.f * i + 1.f) / width - 1.f);
const float vf = ((2.f * j + 1.f) / height - 1.f);
const float uf = rescale(i, width);
const float vf = rescale(j, height);
const float rh = hypotf(uf, vf);
const float sinzz = 1.f - rh * rh;
const float h = 1.f + s->v_fov;
@ -3305,8 +3310,8 @@ static int tetrahedron_to_xyz(const V360Context *s,
int i, int j, int width, int height,
float *vec)
{
const float uf = (float)i / width;
const float vf = (float)j / height;
const float uf = ((float)i + 0.5f) / width;
const float vf = ((float)j + 0.5f) / height;
vec[0] = uf < 0.5f ? uf * 4.f - 1.f : 3.f - uf * 4.f;
vec[1] = 1.f - vf * 2.f;
@ -3394,8 +3399,8 @@ static int dfisheye_to_xyz(const V360Context *s,
const int ei = i >= ew ? i - ew : i;
const float m = i >= ew ? 1.f : -1.f;
const float uf = s->flat_range[0] * ((2.f * ei) / ew - 1.f);
const float vf = s->flat_range[1] * ((2.f * j + 1.f) / eh - 1.f);
const float uf = s->flat_range[0] * rescale(ei, ew);
const float vf = s->flat_range[1] * rescale(j, eh);
const float h = hypotf(uf, vf);
const float lh = h > 0.f ? h : 1.f;
@ -3488,8 +3493,8 @@ static int barrel_to_xyz(const V360Context *s,
const int ew = 4 * width / 5;
const int eh = height;
const float phi = ((2.f * i) / ew - 1.f) * M_PI / scale;
const float theta = ((2.f * j) / eh - 1.f) * theta_range / scale;
const float phi = rescale(i, ew) * M_PI / scale;
const float theta = rescale(j, eh) * theta_range / scale;
const float sin_phi = sinf(phi);
const float cos_phi = cosf(phi);
@ -3506,8 +3511,8 @@ static int barrel_to_xyz(const V360Context *s,
float uf, vf;
if (j < eh) { // UP
uf = 2.f * (i - 4 * ew) / ew - 1.f;
vf = 2.f * (j ) / eh - 1.f;
uf = rescale(i - 4 * ew, ew);
vf = rescale(j, eh);
uf /= scale;
vf /= scale;
@ -3516,8 +3521,8 @@ static int barrel_to_xyz(const V360Context *s,
l_y = -1.f;
l_z = vf;
} else { // DOWN
uf = 2.f * (i - 4 * ew) / ew - 1.f;
vf = 2.f * (j - eh) / eh - 1.f;
uf = rescale(i - 4 * ew, ew);
vf = rescale(j - eh, eh);
uf /= scale;
vf /= scale;
@ -3937,8 +3942,8 @@ static int octahedron_to_xyz(const V360Context *s,
int i, int j, int width, int height,
float *vec)
{
const float x = ((i + 0.5f) / width) * 2.f - 1.f;
const float y = ((j + 0.5f) / height) * 2.f - 1.f;
const float x = rescale(i, width);
const float y = rescale(j, height);
const float ax = fabsf(x);
const float ay = fabsf(y);