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LeAudio

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chapter setting up a nd using broadcast audio streams
the final piece of information needed to configure the stream is the value of presentation
delay which is generally determ ined by the qos settings
the controller can now put together its base structure which describes exactly what streams
it will be transmitting and their configuration
we went through the overview of the base in chapter looking at what it contains which
is repeated in figure
figure simplified base structure
the entire base is an ltv structure which is presented as an ad type with the parameters
shown in table
parameter size
octets description
length total length of the ltv
structure
type service data uuid
level big parameters common to all bises
basic audio announcement service uuid x from bluetooth
assigned numbers
presentation delay range from to sec in µs
x to xffff
numsubgroups the number of subgroups used
to group bises with common
features in this big
section starting a broadcast audio stream
parameter size
octets description
level bis subgroup parameters common parameters for subgroups of bises
numbisi the number of bises in this
subgroup
codecidi codec information for this
subgroup typically this will be
lc x
codecspecificconfigurationlengthi the length of the codec
configuration data for the
codecid in this subgroup
codecspecificconfiguration i varies the codec configuration data
for the codecid in this
subgro up
metadatalengthi length of the metadata for this
subgroup
metadata i varies the metadata for this subgroup
cap requires the
streamingaudiocontexts
ltv metadata for every
subgroup and also the
ccidlist ltv structure if
content control is applied
level specific bis parameters if required for individual bises
bisindexik unique index for each bis in
the big
codecspecificconfigurationlengthik the length of the codec
configuration data for a specific
bis ik in this subgroup
codecspecificconfigurationik varies the codec configuration data
for the specific bis ik in this
subgroup
table the parameters of the base
one point of possible confusion to be aware of i s that bisindex start s from but cisids run
from
chapter setting up and using broadcast audio streams
the base allows a lot of flexibility the majority of which will not be needed in most everyday
applications the level parameters must exist and apply to every subgroup most bises
will probably only have a single subgr oup which will typically carry two or three bises one
for left and one for right plus an optional mono or joint stereo stream the reason for
defining more than one subgroup is for occasions when some of the bises have different
metadata such as diff erent languages differences like this can only be expressed in level
parameters at level you can specify different codec configurations for bises within a
subgroup such as having different quality levels for example one stream at khz sampling
and one at khz but that is the only thing which changes at level different languages
different parental ratings etc all need to have their own subgroup defined at level
where there is more than a single bis the level and level parame ter sections should be
repeated for each bis in order of subgroup and bisindex as shown in table
level parameter value
numbis
codecid
codecspecificconfiguration lv
metadata lv numbis
bisindex
codecspecificconfiguration lv x
numbis
codecid
codecspecificconfiguration lv
metadata lv numbis
bisindex
codecspecificconfiguration lv x
numbis
codecid
codecspecificconfiguration lv
metadata lv numbis
bisindex
codecspecificconfiguration lv x
numbis