Constraints on Dolby Digital Plus bitstreams in online containers

Dolby Digital Plus bitstreams that are delivered in any of the supported online containers meet these conditions.

• The maximum data rate is 3,024 kbps.
• The sample rate is 48 kHz for all substreams present in the bitstream. (The value of the fscod parameter must be set to 0.)
• The number of blocks per frame is constant for all substreams in the bitstream. (The value of the numblkscod parameter must be the same for all substreams.)
• The number of independent substreams is constant.
• Within each independent substream, these bitstream parameters remain constant:
  • bsid
  • bsmod
  • acmod
  • lfeon
  • fscod
• The number of dependent substreams is constant.
• Within each dependent substream, these bitstream parameters remain constant:
  • bsid
  • acmod
  • lfeon
  • fscod
  • chanmap
• The strmtyp value is 0 or 1. strmtyp values of 2 (transcoded) or 3 (reserved) are not supported.
• The acmod value is 1 or more. An acmod value of 0 (1+1) is not allowed.
• Encoded in big-endian format.
  library_booksNote: Dolby Digital Plus decoders must handle both little- and big-endian formats.