[FFmpeg-cvslog] doc/encoders: Add libopencore-amrnb doc

[Timothy Gu]

ffmpeg | branch: release/1.1 | Timothy Gu <timothygu99 at gmail.com> | Mon Jun 17 17:38:38 2013 -0700| [e3e5779a04c1419d02a4811575b771cd2ce92499] | committer: Timothy Gu

doc/encoders: Add libopencore-amrnb doc

Signed-off-by: Michael Niedermayer <michaelni at gmx.at>
(cherry picked from commit 9ead06057acfcc43bcb99a63a7c58543007b2847)

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

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=e3e5779a04c1419d02a4811575b771cd2ce92499
---

 doc/encoders.texi |   37 +++++++++++++++++++++++++++++++++++++
 1 file changed, 37 insertions(+)

diff --git a/doc/encoders.texi b/doc/encoders.texi
index 5d75b8e..9821151 100644
--- a/doc/encoders.texi
+++ b/doc/encoders.texi
@@ -563,6 +563,43 @@ default value is 0 (disabled).
 
 @end table
 
+ at section libopencore-amrnb
+
+OpenCORE Adaptive Multi-Rate Narrowband encoder.
+
+Requires the presence of the libopencore-amrnb headers and library during
+configuration. You need to explicitly configure the build with
+ at code{--enable-libopencore-amrnb --enable-version3}.
+
+This is a mono-only encoder. Officially it only supports 8000Hz sample rate,
+but you can override it by setting @option{strict} to @samp{unofficial} or
+lower.
+
+ at subsection Options
+
+ at table @option
+
+ at item b
+Set bitrate in bits per second. Only the following bitrates are supported,
+otherwise libavcodec will round to the nearest valid bitrate.
+
+ at table @option
+ at item 4750
+ at item 5150
+ at item 5900
+ at item 6700
+ at item 7400
+ at item 7950
+ at item 10200
+ at item 12200
+ at end table
+
+ at item dtx
+Allow discontinuous transmission (generate comfort noise) when set to 1. The
+default value is 0 (disabled).
+
+ at end table
+
 @c man end AUDIO ENCODERS
 
 @chapter Video Encoders