doc/encoders: Add libvo-amrwbenc doc

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
(cherry picked from commit 0ec65aa1046a4417d5c7dfcf8faeecde60e3fe00)

Signed-off-by: Timothy Gu <timothygu99@gmail.com>

Conflicts:
	doc/encoders.texi

1 files changed, 38 insertions, 0 deletions

diff --git a/doc/encoders.texi b/doc/encoders.texi
index 6cc447603f..fac470a7fe 100644
--- a/doc/encoders.texi
+++ b/doc/encoders.texi
@@ -462,6 +462,44 @@ Bitrate.
 
 @end table
 
+@section libvo-amrwbenc
+
+VisualOn Adaptive Multi-Rate Wideband encoder
+
+Requires the presence of the libvo-amrwbenc headers and library during
+configuration. You need to explicitly configure the build with
+@code{--enable-libvo-amrwbenc --enable-version3}.
+
+This is a mono-only encoder. Officially it only supports 16000Hz sample
+rate, but you can override it by setting @option{strict} to
+@samp{unofficial} or lower.
+
+@subsection Options
+
+@table @option
+
+@item b
+Set bitrate in bits/s. Only the following bitrates are supported, otherwise
+libavcodec will round to the nearest valid bitrate.
+
+@table @samp
+@item 6600
+@item 8850
+@item 12650
+@item 14250
+@item 15850
+@item 18250
+@item 19850
+@item 23050
+@item 23850
+@end table
+
+@item dtx
+Allow discontinuous transmission (generate comfort noise) when set to 1. The
+default value is 0 (disabled).
+
+@end table
+
 @c man end AUDIO ENCODERS
 
 @chapter Video Encoders