Воспроизведение звука на Intel Edison через Bluetooth с использованием Advanced Audio Distribution Profile (A2DP)

[Nikobraz]

Зачем мне аналог Bluetooth-брелка за 50$?
Другое дело он бы S/PDIF по Bluetooth отдавал.

[lorc]

А принимать его кто там будет? Нет у bluetooth профилей способных передавать losless звук.

[avstepanov]

Есть же aptX (разницу отлично слышно не сильно вооруженным ухом). Только вот вопрос, умеет ли это edison? Надо попробовать.

[avstepanov]

Попробовал описаный пример — все заработало сразу.
Проще всего звуковой файл «затянуть» непосредственно из сети, к примеру, так:

wget http://westportconsulting.com/sounds/bell.wav

Но вот качество воспроизводимого звука — ну очень низкое.

[avstepanov]

Кстати, «глянул» на то, как «выглядит» bluetooth edison:

pi@RPi2 ~ $ sudo hcitool info 98:4F:EE:02:D4:E1
Requesting information ...
	BD Address:  98:4F:EE:02:D4:E1
	Device Name: edison
	LMP Version: 4.0 (0x6) LMP Subversion: 0x410e
	Manufacturer: Broadcom Corporation (15)
	Features page 0: 0xbf 0xfe 0xcf 0xfe 0xdb 0xff 0x7b 0x87
		<3-slot packets> <5-slot packets> <encryption> <slot offset> 
		<timing accuracy> <role switch> <sniff mode> <RSSI> 
		<channel quality> <SCO link> <HV2 packets> <HV3 packets> 
		<u-law log> <A-law log> <CVSD> <paging scheme> <power control> 
		<transparent SCO> <broadcast encrypt> <EDR ACL 2 Mbps> 
		<EDR ACL 3 Mbps> <enhanced iscan> <interlaced iscan> 
		<interlaced pscan> <inquiry with RSSI> <extended SCO> 
		<EV4 packets> <EV5 packets> <AFH cap. slave> 
		<AFH class. slave> <LE support> <3-slot EDR ACL> 
		<5-slot EDR ACL> <sniff subrating> <pause encryption> 
		<AFH cap. master> <AFH class. master> <EDR eSCO 2 Mbps> 
		<EDR eSCO 3 Mbps> <3-slot EDR eSCO> <extended inquiry> 
		<LE and BR/EDR> <simple pairing> <encapsulated PDU> 
		<err. data report> <non-flush flag> <LSTO> <inquiry TX power> 
		<EPC> <extended features> 
	Features page 1: 0x07 0x00 0x00 0x00 0x00 0x00 0x00 0x00
	Features page 2: 0x20 0x08 0x00 0x00 0x00 0x00 0x00 0x00

А вот так - другие устройства

Nokia Lumia 1520:

pi@RPi2 ~ $ sudo hcitool info C0:64:C6:4E:4B:1E
Requesting information ...
	BD Address:  C0:64:C6:4E:4B:1E
	Device Name: Lumia 1520
	LMP Version: 4.0 (0x6) LMP Subversion: 0x7d3
	Manufacturer: Qualcomm (29)
	Features page 0: 0xff 0xfe 0x8f 0xfe 0xd8 0x3f 0x5b 0x87
		<3-slot packets> <5-slot packets> <encryption> <slot offset> 
		<timing accuracy> <role switch> <hold mode> <sniff mode> 
		<RSSI> <channel quality> <SCO link> <HV2 packets> 
		<HV3 packets> <u-law log> <A-law log> <CVSD> <paging scheme> 
		<power control> <transparent SCO> <broadcast encrypt> 
		<EDR ACL 2 Mbps> <EDR ACL 3 Mbps> <enhanced iscan> 
		<interlaced iscan> <interlaced pscan> <inquiry with RSSI> 
		<extended SCO> <AFH cap. slave> <AFH class. slave> 
		<LE support> <3-slot EDR ACL> <5-slot EDR ACL> 
		<sniff subrating> <pause encryption> <AFH cap. master> 
		<AFH class. master> <EDR eSCO 2 Mbps> <extended inquiry> 
		<LE and BR/EDR> <simple pairing> <encapsulated PDU> 
		<non-flush flag> <LSTO> <inquiry TX power> <EPC> 
		<extended features> 
	Features page 1: 0x07 0x00 0x00 0x00 0x00 0x00 0x00 0x00

Китайская блютус-колонка:

pi@RPi2 ~ $ sudo hcitool info 30:22:00:00:2D:BB
Requesting information ...
	BD Address:  30:22:00:00:2D:BB
	Device Name: X3
	LMP Version: 3.0 (0x5) LMP Subversion: 0x1f4
	Manufacturer: CONWISE Technology Corporation Ltd (66)
	Features page 0: 0xbf 0x3a 0x85 0xfa 0x88 0x1d 0x59 0x87
		<3-slot packets> <5-slot packets> <encryption> <slot offset> 
		<timing accuracy> <role switch> <sniff mode> <RSSI> <SCO link> 
		<HV2 packets> <HV3 packets> <CVSD> <power control> 
		<broadcast encrypt> <EDR ACL 2 Mbps> <enhanced iscan> 
		<interlaced iscan> <interlaced pscan> <inquiry with RSSI> 
		<extended SCO> <AFH cap. slave> <3-slot EDR ACL> 
		<5-slot EDR ACL> <pause encryption> <AFH cap. master> 
		<AFH class. master> <extended inquiry> <simple pairing> 
		<encapsulated PDU> <non-flush flag> <LSTO> <inquiry TX power> 
		<EPC> <extended features> 
	Features page 1: 0x01 0x00 0x00 0x00 0x00 0x00 0x00 0x00

Блютус-модуль на базе CSR8645 (поддерживает aptx):

pi@RPi2 ~ $ sudo hcitool info C0:7A:A5:00:9B:4A
Requesting information ...
	BD Address:  C0:7A:A5:00:9B:4A
	Device Name: CSR8645
	LMP Version: 4.0 (0x6) LMP Subversion: 0x21c8
	Manufacturer: Cambridge Silicon Radio (10)
	Features page 0: 0xff 0xff 0x8f 0xfe 0x9b 0xff 0x59 0x87
		<3-slot packets> <5-slot packets> <encryption> <slot offset> 
		<timing accuracy> <role switch> <hold mode> <sniff mode> 
		<park state> <RSSI> <channel quality> <SCO link> <HV2 packets> 
		<HV3 packets> <u-law log> <A-law log> <CVSD> <paging scheme> 
		<power control> <transparent SCO> <broadcast encrypt> 
		<EDR ACL 2 Mbps> <EDR ACL 3 Mbps> <enhanced iscan> 
		<interlaced iscan> <interlaced pscan> <inquiry with RSSI> 
		<extended SCO> <EV4 packets> <EV5 packets> <AFH cap. slave> 
		<AFH class. slave> <3-slot EDR ACL> <5-slot EDR ACL> 
		<sniff subrating> <pause encryption> <AFH cap. master> 
		<AFH class. master> <EDR eSCO 2 Mbps> <EDR eSCO 3 Mbps> 
		<3-slot EDR eSCO> <extended inquiry> <simple pairing> 
		<encapsulated PDU> <non-flush flag> <LSTO> <inquiry TX power> 
		<EPC> <extended features> 
	Features page 1: 0x01 0x00 0x00 0x00 0x00 0x00 0x00 0x00