Codec type indication for Dolby Atmos content
For HTTP Live Streaming streams containing Dolby Digital
Plus tracks with
Dolby Atmos content, the CODEC
attribute of the
EXT-X-STREAM-INF
parameter contains a value of ec-3
for
indication of the audio codec. In addition, a CHANNELS
attribute is included in
the #EXT-X-MEDIA
parameter.
The value of the CHANNELS
attribute is the number of decodable objects
followed by a slash (/) and then JOC
. JOC
is the audio
coding identifier for a Dolby Digital Plus bitstream with joint object coding data. The number of decodable objects is the decimal representation of the
eight-bit bit field for complexity_index_type_a
in the
EC3SpecificBox
of a Dolby Digital Plus audio track.
For example, for a media presentation containing a Dolby Digital
Plus bitstream
with Dolby Atmos content, the CHANNELS
attribute of the
#EXT-X-MEDIA
parameter is set as follows:
#EXT-X-MEDIA:TYPE=AUDIO,GROUP-ID="ATMOS",LANGUAGE="eng",
NAME="ATMOS Track",AUTOSELECT=YES,DEFAULT=YES,CHANNELS="16/JOC",
URI="../../DDP/ChID_voices_6ch_256kbps_ddp_sub.m3u8"