{ "hammer", "hammer", 0, AV_OPT_TYPE_CONST, {.i64=HAMMER}, 0, 0, FLAGS, "out" },
{"sinusoidal", "sinusoidal", 0, AV_OPT_TYPE_CONST, {.i64=SINUSOIDAL}, 0, 0, FLAGS, "out" },
{ "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" },
{ "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 pannini 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 pannini_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 d = s->h_fov;
+ float k = uf * uf / ((d + 1.f) * (d + 1.f));
+ float dscr = k * k * d * d - (k + 1) * (k * d * d - 1.f);
+ float clon = (-k * d + sqrtf(dscr)) / (k + 1.f);
+ float S = (d + 1.f) / (d + clon);
+ float lon = -(M_PI + atan2f(uf, S * clon));
+ float lat = -atan2f(vf, S);
+
+ vec[0] = sinf(lon) * cosf(lat);
+ vec[1] = sinf(lat);
+ vec[2] = cosf(lon) * cosf(lat);
+
+ 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 PANNINI:
case FISHEYE:
case FLAT:
av_log(ctx, AV_LOG_ERROR, "Supplied format is not accepted as input.\n");
w = roundf(wf * 0.5f);
h = roundf(hf);
break;
+ case PANNINI:
+ s->out_transform = pannini_to_xyz;
+ prepare_out = prepare_fisheye_out;
+ w = roundf(wf);
+ h = roundf(hf);
+ break;
default:
av_log(ctx, AV_LOG_ERROR, "Specified output format is not handled.\n");
return AVERROR_BUG;