ffmpeg | branch: master | Paul B Mahol <onemda@gmail.com> | Sat Feb 29 22:27:11 2020 +0100| [8f3df1dd4d0eb8cdc59af9cb77b213630bf6af8b] | committer: Paul B Mahol avfilter/vf_v360: improve interpolation for equirect input at poles

http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=8f3df1dd4d0eb8cdc5...

libavfilter/vf_v360.c | 20 ++++++++++++++++++-- 1 file changed, 18 insertions(+), 2 deletions(-) diff --git a/libavfilter/vf_v360.c b/libavfilter/vf_v360.c index fc799f18c2..b6195a01f6 100644 --- a/libavfilter/vf_v360.c +++ b/libavfilter/vf_v360.c @@ -639,6 +639,22 @@ static inline int reflecty(int y, int h) return y; } +/** + * Reflect x operation for equirect. + * + * @param x input horizontal position + * @param y input vertical position + * @param w input width + * @param h input height + */ +static inline int ereflectx(int x, int y, int w, int h) +{ + if (y < 0 || y >= h) + x += w / 2; + + return mod(x, w); +} + /** * Reflect x operation. * @@ -1745,8 +1761,8 @@ static int xyz_to_equirect(const V360Context *s, for (int i = 0; i < 4; i++) { for (int j = 0; j < 4; j++) { - us[i][j] = mod(ui + j - 1, width); - vs[i][j] = av_clip(vi + i - 1, 0, height - 1); + us[i][j] = ereflectx(ui + j - 1, vi + i - 1, width, height); + vs[i][j] = reflecty(vi + i - 1, height); } }