From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from ffbox0-bg.mplayerhq.hu (ffbox0-bg.ffmpeg.org [79.124.17.100]) by master.gitmailbox.com (Postfix) with ESMTP id 5D52948DC6 for ; Tue, 26 Mar 2024 23:08:40 +0000 (UTC) Received: from [127.0.1.1] (localhost [127.0.0.1]) by ffbox0-bg.mplayerhq.hu (Postfix) with ESMTP id 1606F68D6A8; Wed, 27 Mar 2024 01:08:18 +0200 (EET) Received: from mail-yb1-f201.google.com (mail-yb1-f201.google.com [209.85.219.201]) by ffbox0-bg.mplayerhq.hu (Postfix) with ESMTPS id B5C5A68D6A5 for ; Wed, 27 Mar 2024 01:08:09 +0200 (EET) Received: by mail-yb1-f201.google.com with SMTP id 3f1490d57ef6-dccc49ef73eso9031720276.2 for ; Tue, 26 Mar 2024 16:08:09 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1711494488; x=1712099288; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=bXJEewB3fmHVFcWQAcIc27DgSjqSqPL+uAUCWz/71Yg=; b=Hhayq3BypaLkOK9F9wGUKukI+dSg0zxcd27nPElKa0TOhdU7UVdWZ4KlGw9a4H5vJ9 2CNH3TJCbQcCHDYmpMHqHe2syZOi93uHF6+z0or5wGxaglJoDGauG3YxiZBK7KKrP+9a 5FRsM3ju8kgoHYkToLt3PWuRco4R5V9UZ+hhlnjPsip0EkaO12a+BzcYPkDzXtBuWGxu 3EuoLTZPy0CcLO8Yokq+DJHo52EbhM2hSEL6U8ESX8yMFQOFJ1I/TeS87QLZGAP2WvBF 2V1QLv162iqVnlynYYyXhS4jt2adwMqnn68XDb1/Z+FsRejTWtzJU3l86/rFbWiOoyWE cf3w== X-Gm-Message-State: AOJu0YyCFoGVUHEnYQG+ipQZ9O9FC/m8QJmM1eJoybxDETPSfq3P/WA9 VPi4ygCWS1wBjY0ToOiopSn1rE59JMSm/rsNUS4bLGSAl/r5FxBoFF7UVO7nmsnLQq08GFnqxMi VR3ig0cXX775rJe7oHBsbwF3H9QVcq+fnBC/ZJdMRrpGyrg8FOsoGek+OU2+1CXskWyMr7cVhlC EqjNLbB84jAU+Su75Wg5kk+BhaqfpgazZf7Ju9Qz4Vow/i X-Google-Smtp-Source: AGHT+IEQMRFxrrXebYo2iOxW7lAeBRrL33cM6zrLpnL636d2Ju0p152nGtGUAmsdaAl7fHCp/koF7lYBh2v3cQ== X-Received: from asoulier-us.c.googlers.com ([fda3:e722:ac3:cc00:20:ed76:c0a8:f79]) (user=asoulier job=sendgmr) by 2002:a05:6902:1b90:b0:dbe:a0c2:df25 with SMTP id ei16-20020a0569021b9000b00dbea0c2df25mr747415ybb.8.1711494488399; Tue, 26 Mar 2024 16:08:08 -0700 (PDT) Date: Tue, 26 Mar 2024 23:07:56 +0000 In-Reply-To: <20240326230757.282319-1-asoulier@google.com> Mime-Version: 1.0 References: <20240326230757.282319-1-asoulier@google.com> X-Mailer: git-send-email 2.44.0.396.g6e790dbe36-goog Message-ID: <20240326230757.282319-4-asoulier@google.com> To: ffmpeg-devel@ffmpeg.org Subject: [FFmpeg-devel] [PATCH 4/5] doc: Add LC3/LC3plus muxer and encoder parameters documentation X-BeenThere: ffmpeg-devel@ffmpeg.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: FFmpeg development discussions and patches List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , From: Antoine Soulier via ffmpeg-devel Reply-To: FFmpeg development discussions and patches Cc: Antoine Soulier Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: ffmpeg-devel-bounces@ffmpeg.org Sender: "ffmpeg-devel" Archived-At: List-Archive: List-Post: Signed-off-by: Antoine Soulier --- doc/encoders.texi | 57 +++++++++++++++++++++++++++++++++++++++ doc/general_contents.texi | 11 +++++++- doc/muxers.texi | 6 +++++ 3 files changed, 73 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..e7cf4f8239 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 +1308,8 @@ 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 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 a10a8e216f..9687746c30 100644 --- a/doc/muxers.texi +++ b/doc/muxers.texi @@ -2612,6 +2612,12 @@ WebDAV server every second: ffmpeg -f x11grab -framerate 1 -i :0.0 -q:v 6 -update 1 -protocol_opts method=PUT http://example.com/desktop.jpg @end example +@section lc3 +Bluetooth SIG Low Complexity Communication Codec audio (LC3), or +ETSI TS 103 634 Low Complexity Communication Codec plus (LC3plus). + +This muxer accepts a single @code{lc3} audio stream. + @section matroska Matroska container muxer. -- 2.44.0.396.g6e790dbe36-goog _______________________________________________ ffmpeg-devel mailing list ffmpeg-devel@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-devel To unsubscribe, visit link above, or email ffmpeg-devel-request@ffmpeg.org with subject "unsubscribe".