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LeAudio

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the lock as it can prevent other commanders or initiators accessing the acceptors when a
a firmware update is considered to be the start of a new life
section cap the common audio profile
client no longer needs exclusive access it should release the lock
the rank is a value that is normally assigned at manufacture to provide a unique number to
each m ember of the coordinated set it doesnt imply any priority but is a unique positive
integer within the coordinated set which is used to ensure that all client s apply their
operations to the members of the set in the same order rank is used in the ord ered access
procedure in csip this states that when applying a lock for any reason clients should start
with the set member that it knows to have the lowest rank and then work up through the other
members of the coordinated set in ascending numeric orde r of rank that prevents a race
condition where two different client s apply a lock to different set members at the same time
the rank values are normally set during manufacture
the ordered access procedure is also used by cap as a precursor to runnin g any cap
procedure it checks whether any acceptor is locked and only continues with the cap
procedure once it has determined that none of the set members have a lock set it then
applies the cap procedure to each acceptor in order of increasing rank
cap the common audio profile
as i said above cap can be considered as the recipe book for all of bluetooth le audio
bringing together all of the other specifications into five main sets of procedures which defin e
the way that everything works top level profiles like hap tmap and pbp then refer to
these cap procedures adding additional requirements for their specific use cases
cap is where the initiator acceptor and comman der roles that im using throughout this
book are defined whilst only the initiator and acceptor can be involved in audio streams
cap describes how all three of these roles can include a range of components from the other
generic audio framework specifications these are listed in the matrix of table which
shows mandatory optional conditional and excluded requirements conditional features
are normally mandated for specific combinations of other features and require that a role
supports at least one of a number of optional components excluded combinations are not
allowed the full details of all of the se combinations can be found in table of cap
boxes with a dash are features which could be implemented in a device but are outside the
scope of the cap procedures
role
component acceptor initiator commander
bap broadcast assistant x o c
bap scan delegator c x c
vcp volume controller x c
vcp volume renderer o x x
chapter cap and csips
role
component acceptor initiator commander
micp microphone controller x c
micp microphone device o x x
ccp call control server x o x
ccp call control client o x
mcp media control server x o x
csip set coordinator x c m
csip set member c x x
m mandatory o optional c conditional x excluded not
relevant to this profile
table component support requirements for cap roles see table of cap for individual conditions
cap procedures for unicast stream management
the cap procedures for managing streams can be grouped into three categories the first is
a set of three procedures for unicast streams which are largely self explanatory
unicast audio start procedure
unicast audio update procedure
unicast a udio stop procedure
these procedures involve both the initiator and the acceptor as setting up each unicast
stream uses command and response sequences
cap procedures for broadcast stream transmission
the second set o f three procedures is for broadcast streams
broadcast audio start procedure
broadcast audio update procedure
broadcast audio stop procedure
the broadcast audio start stop and update procedures are only used by the initiator as that
is set up unilaterally with no knowledge of whether any acceptors are present
section cap the common audio pro file
cap procedures for broadcast stream reception
to complement the broadcast procedures for the initiator the third set of stream management
procedures is for acceptors that want to acquire the broadcast audio streams giving us two
procedures
broadcast audio reception start procedure
broadcast audio reception ending procedure
there is no broadcast audio update procedure for the acceptor as an acceptor is a passive
entity in broadcast which only consumes the audio stream it cannot do anything to update
the content of the broadcast streams hence there is no update procedure for broadcast audio
reception
cap procedures for stream handover
cap includes two procedures specifically for a stream handover where an initiator wants to
transition between transmitting unicast and broadcast audio streams and vice versa these
are the
unicast to broadcast audio handover procedure and the
broadcast to unicast audio handover procedure
these are very important as they describe the audio sharing use case where a user can
transition from liste ning to a private stream from their phone or music source to sharing it
with friends by converting it to broadcast although the transmission topology changes
between cig to big the original initiator retains control of the audio s tream and the user s
acceptors
the reason for the importance of the handover procedures is that most initiators and
acceptors do not have the resources to handle concurrent unicast and broadcast streams for
the h igh reliability qos settings there simply isnt enough airtime to do both that means
that an initiator usually needs to stop its unicast stream before staring the broadcast stream
even for a khz sampling rate to ensure continuity for the primary user ie the one who
is sharing their audio with their friends the initiator has to apply the same context type s to
the new stream in most cases the primary user with the audio source will want to continue
to control the stream so although the audio stream is now broadcast they will keep their
acl link up and a ssociate the new broadcast audio stream with the same content control