Hadn’t heard anything on this
question, just though I’d give it another try. Thanks in advance
for any help you can provide.
-----Original Message-----
From: Shawn Steenhagen
[mailto:email@hidden]
Sent: Thursday,
January 24, 2013 9:57 AM
To: 'email@hidden'
Subject: A2DP with AAC codec:
non-existent document reference in the "Bluetooth Accessory Design
Guidelines for Apple Products"
On page 15 of the “Bluetooth
Accessory Design Guidelines for Apple Products” , Table 1-3 shows the
expected format of the AAC audio payload with further text indicating the
details of the data “…is defined in Section 1.7.3 Table 1.32
in ISO/IEC 13818-3:2005”
There is no version 2005 of ISO/IEC
13818-3, the latest is 1998, so I’m guessing there is some typo.
What is the correct document they are referencing? Is it the 1998 version
of MPEG2 or do they mean a 2005 version of MPEG 4?
I’m trying to make sense of
the following 8 byte header
|FC 00 00 B0 90 80 03 00|
which appears in each packet before
the payloadLengthInfo( ) and MPEG2 data payload itself. The format
doesn’t seem to match an AudioMuxElement as defined by MPEG4 part 3.
Does anyone know the correct
document or can anyone provide the definition of that 8 byte header that I am
seeing?
I am using an IPOD gen 4 with latest
iOS6
Thanks,
Shawn K. Steenhagen
Software Specialist
Applied Signal Processing, Inc.
www.appliedsignalprocessing.com