From 8a02a8031ef4f98faf5647f0e01a8922247bf748 Mon Sep 17 00:00:00 2001
From: Anton Khirnov <anton@khirnov.net>
Date: Sun, 17 Jan 2016 15:02:17 +0100
Subject: lavfi: add an NVIDIA NPP-based scaling filter

---
 doc/filters.texi | 38 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 38 insertions(+)

(limited to 'doc')

diff --git a/doc/filters.texi b/doc/filters.texi
index 722c8b03b6..23e4286da8 100644
--- a/doc/filters.texi
+++ b/doc/filters.texi
@@ -2181,6 +2181,44 @@ scale="trunc(3/2*iw/hsub)*hsub:trunc(3/2*ih/vsub)*vsub"
 scale=w='min(500\, iw*3/2):h=-1'
 @end example
 
+@section scale_npp
+
+Use the NVIDIA Performance Primitives (libnpp) to perform scaling and/or pixel
+format conversion on CUDA video frames. Setting the output width and height
+works in the same way as for the @var{scale} filter.
+
+The following additional options are accepted:
+@table @option
+@item format
+The pixel format of the output CUDA frames. If set to the string "same" (the
+default), the input format will be kept. Note that automatic format negotiation
+and conversion is not yet supported for hardware frames
+
+@item interp_algo
+The interpolation algorithm used for resizing. One of the following:
+@table @option
+@item nn
+Nearest neighbour.
+
+@item linear
+@item cubic
+@item cubic2p_bspline
+2-parameter cubic (B=1, C=0)
+
+@item cubic2p_catmullrom
+2-parameter cubic (B=0, C=1/2)
+
+@item cubic2p_b05c03
+2-parameter cubic (B=1/2, C=3/10)
+
+@item super
+Supersampling
+
+@item lanczos
+@end table
+
+@end table
+
 @section select
 Select frames to pass in output.
 
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