Sort SYNOPSIS, descriptions, SEE ALSO.
Use more macros. Fix sections. New sentence, new line. Various other improvements.
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.\" $NetBSD: bta2dpd.8,v 1.1 2017/01/28 16:55:54 nat Exp $
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.\" $NetBSD: bta2dpd.8,v 1.2 2017/01/28 23:52:45 wiz Exp $
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.\"
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.\" Copyright (c) 2015 - 2016 Nathanial Sloss <nathanialsloss@yahoo.com.au>
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.\" All rights reserved.
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@ -37,45 +37,44 @@
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.Nd Bluetooth Advanced Audio Distribution Profile daemon
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.Sh SYNOPSIS
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.Nm
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.Op Fl d Ar device
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.Op Fl m Ar mode
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.Op Fl B Ar bitpool
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.Op Fl V Ar volume
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.Op Fl M Ar mtu
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.Op Fl f Ar channel_mode
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.Op Fl r Ar rate
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.Op Fl b Ar blocks
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.Op Fl e Ar encoding_bands
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.Op Fl A Ar bitpool_allocation
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.Op Fl v
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.Op Fl A Ar bitpool_allocation
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.Op Fl B Ar bitpool
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.Op Fl b Ar blocks
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.Op Fl d Ar device
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.Op Fl e Ar encoding_bands
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.Op Fl f Ar channel_mode
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.Op Fl M Ar mtu
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.Op Fl m Ar mode
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.Op Fl r Ar rate
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.Op Fl V Ar volume
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.Fl a Ar address
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.Ar files...
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.Ar files ...
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.Nm
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.Fl K
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.Op Fl I
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.Op Fl Iv
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.Op Fl A Ar bitpool_allocation
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.Op Fl B Ar bitpool
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.Op Fl b Ar blocks
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.Op Fl d Ar device
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.Op Fl e Ar encoding_bands
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.Op Fl f Ar channel_mode
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.Op Fl m Ar mode
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.Op Fl p Ar psm
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.Op Fl B Ar bitpool
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.Op Fl f Ar channel_mode
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.Op Fl r Ar rate
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.Op Fl b Ar blocks
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.Op Fl e Ar encoding_bands
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.Op Fl A Ar bitpool_allocation
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.Op Fl v
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.Op a Ar address
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.Ar file
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.Nm
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.Fl t
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.Op Fl A Ar bitpool_allocation
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.Op Fl B Ar bitpool
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.Op Fl V Ar volume
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.Op Fl M Ar mtu
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.Op Fl f Ar channel_mode
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.Op Fl r Ar rate
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.Op Fl b Ar blocks
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.Op Fl e Ar encoding_bands
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.Op Fl A Ar bitpool_allocation
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.Ar files...
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.Op Fl f Ar channel_mode
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.Op Fl M Ar mtu
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.Op Fl r Ar rate
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.Op Fl V Ar volume
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.Ar files ...
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.Nm
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.Fl t
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.Fl K
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@ -84,12 +83,9 @@
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The
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.Nm
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daemon is used to transmit/receive audio to/from Bluetooth devices such as
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speakers or headphones, using the Advanced Audio Distribution Profile
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(A2DP)
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speakers or headphones, using the Advanced Audio Distribution Profile
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(A2DP).
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.Bl -tag -indent width
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.It Fl d Ar device
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Local device address.
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May be given as BDADDR or device name.
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.It Fl a Ar address
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Remote device address.
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The
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@ -100,83 +96,91 @@ If a name was specified,
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.Nm
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attempts to resolve the name via
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.Xr bt_gethostbyname 3 .
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.It Ar files...
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Files to stream. These can be wav files or CD-Audio Red Book data or output from
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.Xr pad 4
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device.
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If not specified the default is stdin or stdout if -K applied and
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.Nm
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is used as an audio sink.
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.Pp
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When writing to a file or stdout it is raw 16-bit little endian (pulse coded
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modulation) pcm data.
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So a utility must be used to convert the file to add a header or use the
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audioplay command as stated in EXAMPLES.
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.It Fl M Ar mtu
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Allows setting the Maximum Transmission Unit (MTU) for the streaming
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connections.
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.Pp
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For most devices this would be 672 but if audio is broken or has gaps lowering
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this value may help.
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.It Fl I
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Initiate a Discover command. Useful when used as an audio sink as some
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devices need this to pair.
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.It Fl K
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Allows registering as an audio sink receiving an incoming connection.
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.It Fl m Ar mode
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Set L2CAP connection link mode.
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Supported modes are:
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.Pp
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.Bl -tag -compact
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.It auth
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require devices to be paired.
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.It encrypt
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auth, plus enable encryption.
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.It secure
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encryption, plus change of link key.
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.El
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.It Fl p Ar psm
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Allows changing the l2cap psm for an audio sink the default is 25.
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Most all devices will use 25.
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.It Fl t
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Test mode can be used with -K to decode and receive encoded music from
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stdout/stdin to file.
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.It Fl V Ar volume
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Allows shifting the volume of the music by 1 or 2 bits prior to encoding for
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increased volume.
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.Pp
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.Sy USE WITH CARE
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as this may mean the output is quite loud.
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.It Fl B Ar bitpool
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Allows setting the maximum bitpool value for your device.
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This may have to be lowered if audio is distorted.
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.Pp
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Use
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.Nm
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with only the -v option and the maximum bitpool for your device will be printed
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to stdout.
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with only the
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.Fl v
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option and the maximum bitpool for your device will be printed to stdout.
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.It Fl d Ar device
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Local device address.
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May be given as BDADDR or device name.
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.It Fl I
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Initiate a Discover command.
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Useful when used as an audio sink as some devices need this to pair.
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.It Fl K
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Allows registering as an audio sink receiving an incoming connection.
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.It Fl M Ar mtu
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Allows setting the Maximum Transmission Unit (MTU) for the streaming
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connections.
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.Pp
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For most devices this would be 672 but if audio is broken or has gaps lowering
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this value may help.
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.It Fl m Ar mode
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Set L2CAP connection link mode.
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Supported modes are:
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.Pp
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.Bl -tag -compact -width encrypt
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.It auth
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Require devices to be paired.
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.It encrypt
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Auth, plus enable encryption.
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.It secure
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Encryption, plus change of link key.
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.El
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.It Fl p Ar psm
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Allows changing the l2cap psm for an audio sink the default is 25.
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Most all devices will use 25.
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.It Fl t
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Test mode can be used with
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.Fl K
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to decode and receive encoded music from stdout/stdin to file.
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.It Fl V Ar volume
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Allows shifting the volume of the music by 1 or 2 bits prior to encoding for
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increased volume.
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.Pp
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.Sy USE WITH CARE
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as this may mean the output is quite loud.
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.It Fl v
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Be verbose.
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.It Ar files ...
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Files to stream.
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These can be WAV files or CD-Audio Red Book data or output from a
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.Xr pad 4
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device.
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If not specified, the default is stdin or stdout if
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.Fl K
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applied and
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.Nm
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is used as an audio sink.
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.Pp
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When writing to a file or stdout it is raw 16-bit little endian (pulse coded
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modulation) PCM data.
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So a utility must be used to convert the file to add a header or use the
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.Xr audioplay 1
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command as stated in
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.Sx EXAMPLES .
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.El
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.Ss Channel Modes
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.Bl -tag -indent width
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.It Fl f Ar channel_mode
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.Ar 0
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.Bl -tag -width 2n
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.It Ar 0
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This specifies that all possible input formats are accepted and then one is
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chosen starting with joint stereo then stereo then 2 channel then mono.
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.Lp
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.Ar m
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.It Ar m
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This specifies that the input is monophonic.
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.Lp
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.Ar 2
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.It Ar 2
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This specifies that the input is dual-channel.
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.Lp
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.Ar j
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.It Ar j
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This specifies that the input is joint-stereo.
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.Lp
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.Ar s
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.It Ar s
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This specifies that the input is stereo.
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This is the default.
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.El
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.Pp
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Specifying joint stereo as opposed to stereo would allow for a slightly higher
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quality of playback as
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@ -184,95 +188,98 @@ quality of playback as
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will only encode stereo and monophonic streams.
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.It Fl r Ar rate
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The frequency of the input.
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Where rate is one of 0 16000, 32000, 44100, 48000.
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Where rate is one of 0, 16000, 32000, 44100, 48000.
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This defaults to 44.1 kHz.
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.Pp
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A value of 0 will arbitrate from the highest to lowest frequency.
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.El
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.Ss Sub Band Codec (SBC) Encoding Options
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.Bl -tag -indent width
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.It Fl A Ar bitpool_allocation
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.Bl -tag width 2n
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.It Ar 0
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Bit Allocation is negotiated starting with Loudness then SNR.
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.It Ar S
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Audio is encoded with SNR (Signal to Noise Ratio) bit allocation.
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.It Ar L
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Audio is encoded with Loudness bit allocation.
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This is the default.
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.El
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.It Fl b Ar blocks
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Number of blocks to use for encoding.
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Where blocks is one of 0 4, 8, 12, 16.
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Where blocks is one of 0, 4, 8, 12, 16.
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This defaults to 16 blocks.
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.Pp
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In the case of 0 the number of blocks is
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negotiated starting from 16 down to 4.
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.It Fl e Ar bands
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.Ar 0
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.Bl -tag -width 2n
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.It Ar 0
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Number of SBC bands is negotiated 8 then 4.
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.Lp
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.Ar 4
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Audio is endoded with 4 SBC bands.
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.Lp
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.Ar 8
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Audio is endoded with 8 SBC bands.
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This is the default.
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.It Fl A Ar bitpool_allocation
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.Ar 0
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Bit Allocation is negotiated starting with Loudness then SNR.
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.Lp
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.Ar S
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Audio is encoded with SNR (Signal to Noise Ratio) bit allocation.
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.Lp
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.Ar L
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Audio is encoded with Loudness bit allocation.
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.It Ar 4
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Audio is encoded with 4 SBC bands.
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.It Ar 8
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Audio is encoded with 8 SBC bands.
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This is the default.
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.El
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.El
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.Pp
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It may be necessary to use
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.Xr btconfig 1
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to set the class of your bluetooth adapter to that of headphones when
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.Xr btconfig 8
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to set the class of your Bluetooth adapter to that of headphones when
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using
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.Nm
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as an audio sink.
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i.e
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I.e.,
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.Dl btconfig ubt0 class 0x200418
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Then start
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.Nm
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with -K before pairing.
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with
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.Fl K
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before pairing.
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.Pp
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This is necessary as some devices only perform an
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.Xr sdpquery 1
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just after pairing and cache the result.
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.Pp
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It is possible to specify multiples of -r -e -b -f .
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It is possible to specify multiples of
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.Fl r Fl e Fl b Fl f .
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This will mean that the specified combinations are reported as being accepted
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by the source/sink.
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.Pp
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When used as a sink -K all modes, bands, blocks and allocation modes will be
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When used as a sink
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.Fl ( K ) ,
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all modes, bands, blocks and allocation modes will be
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accepted unless specified as options.
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i.e -r 44100 will only accept a connection with a rate of 44.1kHz.
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I.e.,
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.Fl r Ar 44100
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will only accept a connection with a rate of 44.1kHz.
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.Sh EXAMPLES
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.Dl bta2dpd -a spkr my.wav
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.Lp
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Encode and send audio
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.Pa my.wav
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to address
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.Sq spkr .
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.Pp
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.Dl bta2dpd -a spkr /dev/pad
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.Lp
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Encode and send audio from
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.Xr pad 4
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to address
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.Sq spkr .
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.Pp
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.Dl bta2dpd -K out.pcm
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.Lp
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Decode stream from any connected address
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and write it to
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.Pa out.pcm .
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.Pp
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.Dl bta2dpd -K -a phone | audioplay -f -e linear -P 16 -s 44100 -c 2 --
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.Lp
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Decode stream from address
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.Sq phone
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and send to speakers.
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.Sh SEE ALSO
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.Xr pad 4 ,
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.Xr audioplay 1 ,
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.Xr btconfig 1 ,
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.Xr sdpquery 1
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.Xr sdpquery 1 ,
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.Xr pad 4 ,
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.Xr btconfig 8
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.Sh AUTHORS
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.An Nathanial Sloss
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