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avfilter/v360: add support for off-axis projection output

This commit is contained in:
Paul B Mahol 2021-11-15 11:22:53 +01:00
parent db932241ee
commit a7dfa6b446
3 changed files with 24 additions and 38 deletions
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5
doc/filters.texi
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@ -21814,6 +21814,11 @@ Set if input video is transposed. Boolean value, by default disabled.
@item out_trans
Set if output video needs to be transposed. Boolean value, by default disabled.
@item h_offset
@item v_offset
Set output horizontal/vertical off-axis offset. Default is set to 0.
Allowed range is from -1 to 1.
@item alpha_mask
Build mask in alpha plane for all unmapped pixels by marking them fully transparent. Boolean value, by default disabled.

1
libavfilter/v360.h
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@ -142,6 +142,7 @@ typedef struct V360Context {
int fin_pad, fout_pad;
float yaw, pitch, roll;
float h_offset, v_offset;
int ih_flip, iv_flip;
int h_flip, v_flip, d_flip;

56
libavfilter/vf_v360.c
View File

@ -163,6 +163,8 @@ static const AVOption v360_options[] = {
{ "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"},
{ "h_offset", "output horizontal off-axis offset",OFFSET(h_offset), AV_OPT_TYPE_FLOAT,{.dbl=0.f}, -1.f, 1.f,TFLAGS, "h_offset"},
{ "v_offset", "output vertical off-axis offset", OFFSET(v_offset), AV_OPT_TYPE_FLOAT,{.dbl=0.f}, -1.f, 1.f,TFLAGS, "v_offset"},
{"alpha_mask", "build mask in alpha plane", OFFSET(alpha), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, FLAGS, "alpha"},
{ "reset_rot", "reset rotation", OFFSET(reset_rot), AV_OPT_TYPE_BOOL, {.i64=0}, -1, 1,TFLAGS, "reset_rot"},
{ NULL }
@ -1027,6 +1029,17 @@ static inline void rotate_cube_face_inverse(float *uf, float *vf, int rotation)
}
}
/**
* Offset vector.
*
* @param vec vector
*/
static void offset_vector(float *vec, float h_offset, float v_offset)
{
vec[0] += h_offset;
vec[1] += v_offset;
}
/**
* Normalize vector.
*
@ -1103,8 +1116,6 @@ static void cube_to_xyz(const V360Context *s,
vec[0] = l_x;
vec[1] = l_y;
vec[2] = l_z;
normalize_vector(vec);
}
/**
@ -1854,8 +1865,6 @@ static int stereographic_to_xyz(const V360Context *s,
vec[1] = y / r * sin_theta;
vec[2] = cosf(theta);
normalize_vector(vec);
return 1;
}
@ -1960,8 +1969,6 @@ static int equisolid_to_xyz(const V360Context *s,
vec[1] = y / r * sin_theta;
vec[2] = cosf(theta);
normalize_vector(vec);
return 1;
}
@ -2066,12 +2073,11 @@ static int orthographic_to_xyz(const V360Context *s,
vec[0] = x;
vec[1] = y;
normalize_vector(vec);
return 1;
} else {
vec[0] = 0;
vec[1] = 0;
vec[2] = 1;
vec[0] = 0.f;
vec[1] = 0.f;
vec[2] = 1.f;
return 0;
}
@ -2474,8 +2480,6 @@ static int hammer_to_xyz(const V360Context *s,
vec[1] = M_SQRT2 * y * z;
vec[2] = w * (bb - aa) / (aa + bb);
normalize_vector(vec);
return 1;
}
@ -2546,8 +2550,6 @@ static int sinusoidal_to_xyz(const V360Context *s,
vec[1] = sin_theta;
vec[2] = cos_theta * cos_phi;
normalize_vector(vec);
return 1;
}
@ -2743,8 +2745,6 @@ static int eac_to_xyz(const V360Context *s,
vec[1] = l_y;
vec[2] = l_z;
normalize_vector(vec);
return 1;
}
@ -2846,8 +2846,6 @@ static int flat_to_xyz(const V360Context *s,
vec[1] = l_y;
vec[2] = 1.f;
normalize_vector(vec);
return 1;
}
@ -2897,8 +2895,6 @@ static int fisheye_to_xyz(const V360Context *s,
vec[1] = cos_theta * sin_phi;
vec[2] = sin_theta;
normalize_vector(vec);
return 1;
}
@ -2993,8 +2989,6 @@ static int pannini_to_xyz(const V360Context *s,
vec[1] = sinf(lat);
vec[2] = cosf(lon) * cosf(lat);
normalize_vector(vec);
return 1;
}
@ -3090,8 +3084,6 @@ static int cylindrical_to_xyz(const V360Context *s,
vec[1] = sin_theta;
vec[2] = cos_theta * cos_phi;
normalize_vector(vec);
return 1;
}
@ -3217,8 +3209,6 @@ static int cylindricalea_to_xyz(const V360Context *s,
vec[1] = sin_theta;
vec[2] = cos_theta * cos_phi;
normalize_vector(vec);
return 1;
}
@ -3331,8 +3321,6 @@ static int tetrahedron_to_xyz(const V360Context *s,
vec[1] = 1.f - vf * 2.f;
vec[2] = 2.f * fabsf(1.f - fabsf(1.f - uf * 2.f + vf)) - 1.f;
normalize_vector(vec);
return 1;
}
@ -3444,8 +3432,6 @@ static int dfisheye_to_xyz(const V360Context *s,
vec[1] = cos_theta * vf / lh;
vec[2] = sin_theta;
normalize_vector(vec);
return 1;
}
@ -3568,8 +3554,6 @@ static int barrel_to_xyz(const V360Context *s,
vec[1] = l_y;
vec[2] = l_z;
normalize_vector(vec);
return 1;
}
@ -3826,8 +3810,6 @@ static int barrelsplit_to_xyz(const V360Context *s,
vec[1] = l_y;
vec[2] = l_z;
normalize_vector(vec);
return 1;
}
@ -3884,8 +3866,6 @@ static int tspyramid_to_xyz(const V360Context *s,
vec[2] = -2.f * (1.f - y) / 0.375f + 1.f;
}
normalize_vector(vec);
return 1;
}
@ -3987,8 +3967,6 @@ static int octahedron_to_xyz(const V360Context *s,
vec[1] = y;
}
normalize_vector(vec);
return 1;
}
@ -4293,6 +4271,8 @@ static av_always_inline int v360_slice(AVFilterContext *ctx, void *arg, int jobn
out_mask = s->out_transform(s, j, i, height, width, vec);
else
out_mask = s->out_transform(s, i, j, width, height, vec);
offset_vector(vec, s->h_offset, s->v_offset);
normalize_vector(vec);
av_assert1(!isnan(vec[0]) && !isnan(vec[1]) && !isnan(vec[2]));
rotate(s->rot_quaternion, vec);
av_assert1(!isnan(vec[0]) && !isnan(vec[1]) && !isnan(vec[2]));