Updating audio codecs
For example, there are Hands-Free Profile (HFP) 1.5 implementations using both Bluetooth 2.0 and Bluetooth 1.2 core specifications.
The way a device uses Bluetooth technology depends on its profile capabilities.
It is closely related to Generic Attribute Profile (GATT).
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The profiles provide standards which manufacturers follow to allow devices to use Bluetooth in the intended manner.
For the Bluetooth low energy stack according to Bluetooth 4.0 a special set of profiles applies.
Each A2DP service, of possibly many, is designed to uni-directionally transfer an audio stream in up to 2 channel stereo, either to or from the Bluetooth host. It includes mandatory support for the low-complexity SBC codec (not to be confused with Bluetooth's voice-signal codecs such as CVSDM), and supports optionally MPEG-1 Part 3/MPEG-2 Part 3 (MP2 and MP3), MPEG-2 Part 7/MPEG-4 Part 3 (AAC and HE-AAC), and ATRAC, and is extensible to support manufacturer-defined codecs, such as apt X.
Some Bluetooth stacks enforce the SCMS-T digital rights management (DRM) scheme.