[FFmpeg-devel] [PATCH 4/6] doc: Add LC3/LC3plus muxer and encoder parameters documentation

[Antoine Soulier via ffmpeg-devel <ffmpeg-devel@ffmpeg.org>]

Signed-off-by: Antoine Soulier <asoulier@google.com>
Signed-off-by: Antoine SOULIER <asoulier@google.com>
---
 doc/encoders.texi         | 57 +++++++++++++++++++++++++++++++++++++++
 doc/general_contents.texi | 12 ++++++++-
 doc/muxers.texi           |  4 +++
 3 files changed, 72 insertions(+), 1 deletion(-)

diff --git a/doc/encoders.texi b/doc/encoders.texi
index 7c223ed74c..0719ba13cc 100644
--- a/doc/encoders.texi
+++ b/doc/encoders.texi
@@ -814,6 +814,63 @@ ffmpeg -i input.wav -c:a libfdk_aac -profile:a aac_he -b:a 64k output.m4a
 @end example
 @end itemize
 
+@anchor{liblc3-enc}
+@section liblc3
+
+liblc3 LC3 (Low Complexity Communication Codec) encoder wrapper.
+
+Requires the presence of the liblc3 headers and library during configuration.
+You need to explicitly configure the build with @code{--enable-liblc3}.
+
+This encoder has support for the Bluetooth SIG LC3 codec for the LE Audio
+protocol, and the following features of LC3plus:
+@itemize @minus
+@item
+Frame duration of 2.5 and 5ms.
+@item
+High-Resolution mode, 48 KHz, and 96 kHz sampling rates.
+@end itemize
+
+For more information see the liblc3 project at
+@url{https://github.com/google/liblc3}.
+
+@subsection Options
+
+The following options are mapped on the shared FFmpeg codec options.
+
+@table @option
+@item b
+Set the bit rate in bits/s. This will determine the fixed size of the encoded
+frames, for a selected frame duration.
+
+@item ar
+Set the audio sampling rate (in Hz).
+
+@item channels
+Set the number of audio channels.
+
+@item frame_duration
+Set the audio frame duration in milliseconds. Default value is 10ms.
+Allowed frame durations are 2.5ms, 5ms, 7.5ms and 10ms.
+LC3 (Bluetooth LE Audio), allows 7.5ms and 10ms; and LC3plus 2.5ms, 5ms
+and 10ms.
+
+The 10ms frame duration is available in LC3 and LC3 plus standard.
+In this mode, the produced bitstream can be referenced either as LC3 or LC3plus.
+
+@item high_resolution
+Enable the high-resolution mode if set to 1. The high-resolution mode is
+available with all LC3plus frame durations and for a sampling rate 48 KHz,
+and 96 KHz.
+
+The encoder automatically turns off this mode at lower sampling rates and
+activates it at 96 KHz.
+
+This mode should be preferred at high bitrates. In this mode, the audio
+bandwidth is always up to the Nyquist frequency, compared to LC3 at 48 KHz,
+which limits the bandwidth to 20 KHz.
+@end table
+
 @anchor{libmp3lame}
 @section libmp3lame
 
diff --git a/doc/general_contents.texi b/doc/general_contents.texi
index f269cbd1a9..9e340fce7b 100644
--- a/doc/general_contents.texi
+++ b/doc/general_contents.texi
@@ -237,6 +237,14 @@ Go to @url{http://sourceforge.net/projects/opencore-amr/} and follow the
 instructions for installing the library.
 Then pass @code{--enable-libfdk-aac} to configure to enable it.
 
+@subsection LC3 library
+
+FFmpeg can make use of the Google LC3 library for LC3 decoding & encoding.
+
+Go to @url{https://github.com/google/liblc3/} and follow the instructions for
+installing the library.
+Then pass @code{--enable-liblc3} to configure to enable it.
+
 @section OpenH264
 
 FFmpeg can make use of the OpenH264 library for H.264 decoding and encoding.
@@ -1300,7 +1308,9 @@ following image formats are supported:
     @tab encoding and decoding supported through external library libilbc
 @item IMC (Intel Music Coder)  @tab     @tab  X
 @item Interplay ACM            @tab     @tab  X
-@item MACE (Macintosh Audio Compression/Expansion) 3:1  @tab     @tab  X
+@item LC3                    @tab E  @tab  E
+    @tab supported through external library liblc3
+@item LC3plus                @tab  E  @tab  E
 @item MACE (Macintosh Audio Compression/Expansion) 6:1  @tab     @tab  X
 @item Marian's A-pac audio     @tab     @tab  X
 @item MI-SC4 (Micronas SC-4 Audio)  @tab     @tab  X
diff --git a/doc/muxers.texi b/doc/muxers.texi
index d9dd72e613..43dabe4499 100644
--- a/doc/muxers.texi
+++ b/doc/muxers.texi
@@ -132,6 +132,10 @@ to Annex B syntax if it's in length-prefixed mode.
 ITU-T H.265 / MPEG-H Part 2 HEVC video. Bitstream shall be converted
 to Annex B syntax if it's in length-prefixed mode.
 
+@item lc3 @emph{audio} (lc3)
+Bluetooth SIG Low Complexity Communication Codec audio.
+ETSI TS 103 634 Low Complexity Communication Codec plus (LC3plus).
+
 @item m4v @emph{video}
 MPEG-4 Part 2 video
 
-- 
2.44.0.396.g6e790dbe36-goog

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