{ "fisheye", "fisheye", 0, AV_OPT_TYPE_CONST, {.i64=FISHEYE}, 0, 0, FLAGS, "out" },
{ "pannini", "pannini", 0, AV_OPT_TYPE_CONST, {.i64=PANNINI}, 0, 0, FLAGS, "out" },
{"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" },
{ "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" },
normalize_vector(vec);
}
+/**
+ * Calculate 3D coordinates on sphere for corresponding frame position in perspective 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 void perspective_to_xyz(const V360Context *s,
+ int i, int j, int width, int height,
+ float *vec)
+{
+ const float uf = ((2.f * i) / width - 1.f);
+ const float vf = ((2.f * j) / height - 1.f);
+ const float rh = hypotf(uf, vf);
+ const float sinzz = 1.f - rh * rh;
+ const float h = 1.f + s->v_fov;
+ const float sinz = (h - sqrtf(sinzz)) / (h / rh + rh / h);
+ const float sinz2 = sinz * sinz;
+
+ if (sinz2 <= 1.f) {
+ const float cosz = sqrtf(1.f - sinz2);
+
+ const float theta = asinf(cosz);
+ const float phi = atan2f(uf, vf);
+
+ const float sin_phi = sinf(phi);
+ const float cos_phi = cosf(phi);
+ const float sin_theta = sinf(theta);
+ const float cos_theta = cosf(theta);
+
+ vec[0] = cos_theta * sin_phi;
+ vec[1] = sin_theta;
+ vec[2] = -cos_theta * cos_phi;
+ } else {
+ vec[0] = 0.f;
+ vec[1] = -1.f;
+ vec[2] = 0.f;
+ }
+
+ normalize_vector(vec);
+}
+
/**
* Calculate 3D coordinates on sphere for corresponding frame position in dual fisheye format.
*
wf = w;
hf = h / 9.f * 8.f;
break;
+ case PERSPECTIVE:
case CYLINDRICAL:
case PANNINI:
case FISHEYE:
w = roundf(wf);
h = roundf(hf * 0.5f);
break;
+ case PERSPECTIVE:
+ s->out_transform = perspective_to_xyz;
+ prepare_out = NULL;
+ w = roundf(wf / 2.f);
+ h = roundf(hf);
+ break;
default:
av_log(ctx, AV_LOG_ERROR, "Specified output format is not handled.\n");
return AVERROR_BUG;