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- Bluetooth Audio Plugin
- ======================
- The audio plugin happen to be in a different socket but all the rules for
- HAL socket apply here as well, the abstract socket name is
- "\0bluez_audio_socket" (tentative):
- .---Audio---. .--Android--.
- | Plugin | | Daemon |
- | | Command | |
- | | --------------------------> | |
- | | | |
- | | <-------------------------- | |
- | | Response | |
- | | | |
- | | | |
- | | | |
- '-----------' '-----------'
- Audio HAL Daemon
- ----------------------------------------------------
- call dev->open() --> command 0x01
- return dev->open() <-- response 0x01
- call dev->open_output_stream() --> command 0x03
- return dev->open_output_stream() <-- response 0x03
- call stream->write() --> command 0x05
- return stream->write() <-- response 0x05
- call stream->common.standby() --> command 0x06
- return stream->common.standby() <-- response 0x06
- call dev->close_output_stream() --> command 0x04
- return dev->close_output_stream() <-- response 0x04
- call dev->close() --> command 0x02
- return dev->close() <-- response 0x02
- Audio Service (ID 0)
- ====================
- Opcode 0x00 - Error response
- Response parameters: Status (1 octet)
- Opcode 0x01 - Open Audio Endpoint commmand
- Command parameters: Service UUID (16 octets)
- Codec ID (1 octet)
- Number of codec presets (1 octet)
- Codec capabilities length (1 octet)
- Codec capabilities (variable)
- Codec preset # length (1 octet)
- Codec preset # configuration (variable)
- ...
- Response parameters: Endpoint ID (1 octet)
- Opcode 0x02 - Close Audio Endpoint command
- Command parameters: Endpoint ID (1 octet)
- Response parameters: <none>
- Opcode 0x03 - Open Stream command
- Command parameters: Endpoint ID (1 octet)
- Response parameters: Outgoing MTU (2 octets)
- Codec configuration length (1 octet)
- Codec configuration (1 octet)
- File descriptor (inline)
- Opcode 0x04 - Close Stream command
- Command parameters: Endpoint ID (1 octet)
- Response parameters: <none>
- Opcode 0x05 - Resume Stream command
- Command parameters: Endpoint ID (1 octet)
- Response parameters: <none>
- Opcode 0x06 - Suspend Stream command
- Command parameters: Endpoint ID (1 octet)
- Response parameters: <none>
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