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Features supported in RDK

Bluetooth feature in RDKFeature Descriptions
Audio Output SourcesBluetooth audio may be different than HDMI audio (e.g. secondary audio program, application sourced audio such as Pandora, voice navigation audio, etc).
Audio Output RoutingDetail PCM audio routing to Bluetooth A2DP SRC, It uses H/W accelerations, S/W processing, RMF involvement on streaming audio/video contents.
Audio EncodingDetail SBC (sub-band coding) and aptX encoding (Bluetooth chip, in software, or in SoC hardware).
Audio Output MutingThe Bluetooth audio output may be muted independently of other audio outputs (e.g. HDMI)
Audio Input (Settop as AD2P SNK)Using RDK device speakers over bluetooth i.e transmitting audio input back to a speaker connected with RDK device.
Dual DecodeSupports ability to simultaneously output one audio stream to HDMI and a different audio stream to Bluetooth
Power ControlIn future, the power state of each Bluetooth connected device and the Bluetooth subsystem can be controlled
Audio/Video Remote Control Profile (AVRCP)Controller (Remote Control) sends mute and volume commands to target. AV/C commands are defined by the 1394 trade association

Bluetooth in RDK - Block Diagram

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6. RDK Apps/Diagnostics - HTML-5 based UI applications to make use of Bluetooth service using Service Manager APIs.

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Bluetooth Architecture

Bluetooth Manager and Bluetooth HAL [BTRCore] is that Bluetooth Manager implements the BT HAL [BTRCore] API.  Then BT HAL [BTRCore] integrates and manages the BlueZ stack though the D-BUS interface.


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BlueZ D-Bus Communication

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Bluetooth - Service Manager

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Some Bluetooth supported gstreamer plugins used by BlueZ 5:


Gstreamer Elements

Descriptions

sbcenc

Bluetooth SBC (sub-band coding) encoder

sbcdec

Bluetooth SBC (sub-band coding) decoder

sbcparse

The sbcparse element will parse a Bluetooth SBC audio stream into frames and timestamp them properly

avdtpsink

Bluetooth AVDTP sink

a2dpsink

Bluetooth A2DP sink for streaming audio

rtpsbcpay

RTP packet payload maker

Use Case : Bluetooth Device Discovery

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RDK Bluetooth A2DP Use Case - Audio Streaming

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