[FFmpeg-cvslog] avfilter/vf_v360: improve interpolation for equirect input at poles
Paul B Mahol
git at videolan.org
Sat Feb 29 23:36:05 EET 2020
ffmpeg | branch: master | Paul B Mahol <onemda at 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=8f3df1dd4d0eb8cdc59af9cb77b213630bf6af8b
---
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);
}
}
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