> For the complete documentation index, see [llms.txt](https://theiotlearninginitiative.gitbook.io/embedded-linux/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://theiotlearninginitiative.gitbook.io/embedded-linux/subsystems/bluetooth/advanced-audio-distribution-profile.md). # Advanced Audio Distribution Profile ```bash root@edison:~# rfkill unblock bluetooth root@edison:~# bluetoothctl ``` ```bash [bluetooth]# scan on Discovery started [CHG] Controller 98:4F:EE:04:21:2A Discovering: yes [NEW] Device F1:C1:83:A4:17:0C Evolutel [NEW] Device 58:51:00:00:41:4D BT MINI [CHG] Device F1:C1:83:A4:17:0C RSSI: -83 [CHG] Device F1:C1:83:A4:17:0C RSSI: -73 ``` ```bash [bluetooth]# scan off [CHG] Device 58:51:00:00:41:4D RSSI is nil [CHG] Device F1:C1:83:A4:17:0C TxPower is nil [CHG] Device F1:C1:83:A4:17:0C RSSI is nil [CHG] Controller 98:4F:EE:04:21:2A Discovering: no Discovery stopped ``` ```bash [bluetooth]# pair 58:51:00:00:41:4D Attempting to pair with 58:51:00:00:41:4D [CHG] Device 58:51:00:00:41:4D Connected: yes [CHG] Device 58:51:00:00:41:4D UUIDs: 00001108-0000-1000-8000-00805f9b34fb [CHG] Device 58:51:00:00:41:4D UUIDs: 0000110b-0000-1000-8000-00805f9b34fb [CHG] Device 58:51:00:00:41:4D UUIDs: 0000110e-0000-1000-8000-00805f9b34fb [CHG] Device 58:51:00:00:41:4D UUIDs: 0000111e-0000-1000-8000-00805f9b34fb [CHG] Device 58:51:00:00:41:4D Paired: yes Pairing successful [CHG] Device 58:51:00:00:41:4D Connected: no ``` ```bash [bluetooth]# connect 58:51:00:00:41:4D Attempting to connect to 58:51:00:00:41:4D [CHG] Device 58:51:00:00:41:4D Connected: yes Connection successful [CHG] Device 58:51:00:00:41:4D UUIDs: 00001108-0000-1000-8000-00805f9b34fb [CHG] Device 58:51:00:00:41:4D UUIDs: 0000110b-0000-1000-8000-00805f9b34fb [CHG] Device 58:51:00:00:41:4D UUIDs: 0000110e-0000-1000-8000-00805f9b34fb [CHG] Device 58:51:00:00:41:4D UUIDs: 0000111e-0000-1000-8000-00805f9b34fb [CHG] Device 58:51:00:00:41:4D UUIDs: 0000111f-0000-1000-8000-00805f9b34fb ``` ```bash [bluetooth]# info 58:51:00:00:41:4D Device 58:51:00:00:41:4D Name: BT MINI Alias: BT MINI Class: 0x240404 Icon: audio-card Paired: yes Trusted: no Blocked: no Connected: yes LegacyPairing: no UUID: Headset (00001108-0000-1000-8000-00805f9b34fb) UUID: Audio Sink (0000110b-0000-1000-8000-00805f9b34fb) UUID: A/V Remote Control (0000110e-0000-1000-8000-00805f9b34fb) UUID: Handsfree (0000111e-0000-1000-8000-00805f9b34fb) UUID: Handsfree Audio Gateway (0000111f-0000-1000-8000-00805f9b34fb) [bluetooth]# ``` ```bash [BT MINI]# quit [DEL] Controller 98:4F:EE:04:21:2A edison [default] ``` ```bash root@edison:~# pactl list sinks Sink #0 State: SUSPENDED Name: alsa_output.platform-merr_dpcm_dummy.0.analog-stereo Description: dummy-audio Analog Stereo Driver: module-alsa-card.c Sample Specification: s16le 2ch 48000Hz Channel Map: front-left,front-right Owner Module: 1 Mute: no Volume: front-left: 65536 / 100% / 0.00 dB, front-right: 65536 / 100%$ balance 0.00 Base Volume: 65536 / 100% / 0.00 dB Monitor Source: alsa_output.platform-merr_dpcm_dummy.0.analog-stereo.mo$ Latency: 0 usec, configured 0 usec Flags: HARDWARE DECIBEL_VOLUME LATENCY Properties: alsa.resolution_bits = "16" device.api = "alsa" device.class = "sound" alsa.class = "generic" alsa.subclass = "generic-mix" alsa.name = "" alsa.id = "1" alsa.subdevice = "0" alsa.subdevice_name = "subdevice #0" alsa.device = "0" alsa.card = "1" alsa.card_name = "dummy-audio" alsa.long_card_name = "dummy-audio" device.bus_path = "platform-merr_dpcm_dummy.0" sysfs.path = "/devices/platform/merr_dpcm_dummy.0/sound/card1" device.string = "hw:1" ... ... Sink #1 State: SUSPENDED Name: alsa_output.0.analog-stereo Description: Loopback Analog Stereo Driver: module-alsa-card.c Sample Specification: s16le 2ch 44100Hz Channel Map: front-left,front-right Owner Module: 2 Mute: no Volume: front-left: 65536 / 100% / 0.00 dB, front-right: 65536 / 100%$ Base Volume: 65536 / 100% / 0.00 dB Monitor Source: alsa_output.0.analog-stereo.monitor Latency: 0 usec, configured 0 usec Flags: HARDWARE HW_VOLUME_CTRL DECIBEL_VOLUME LATENCY Properties: alsa.resolution_bits = "16" device.api = "alsa" device.class = "sound" alsa.class = "generic" alsa.subclass = "generic-mix" alsa.name = "Loopback PCM" alsa.id = "Loopback PCM" alsa.subdevice = "0" alsa.subdevice_name = "subdevice #0" alsa.device = "0" alsa.card = "0" alsa.card_name = "Loopback" alsa.long_card_name = "Loopback 1" device.bus_path = "/devices/virtual/sound/card0" ... ... Sink #2 State: SUSPENDED Name: bluez_sink.58_51_00_00_41_4D Description: BT MINI Driver: module-bluez5-device.c Sample Specification: s16le 2ch 44100Hz Channel Map: front-left,front-right Owner Module: 13 Mute: no Volume: front-left: 65536 / 100% / 0.00 dB, front-right: 65536 / 100%$ balance 0.00 Base Volume: 65536 / 100% / 0.00 dB Monitor Source: bluez_sink.58_51_00_00_41_4D.monitor Latency: 0 usec, configured 0 usec Flags: HARDWARE DECIBEL_VOLUME LATENCY Properties: bluetooth.protocol = "a2dp_sink" device.description = "BT MINI" device.string = "58:51:00:00:41:4D" device.api = "bluez" device.class = "sound" device.bus = "bluetooth" device.form_factor = "headset" ``` ```bash root@edison:~# pactl list sinks | grep "Name:" Name: alsa_output.platform-merr_dpcm_dummy.0.analog-stereo Name: alsa_output.0.analog-stereo Name: bluez_sink.58_51_00_00_41_4D root@edison:~# ``` ```bash root@edison:~# pactl set-default-sink bluez_sink.58_51_00_00_41_4D ``` ```bash root@edison:~# gst-launch-1.0 audiotestsrc ! audioconvert ! audioresample ! pulsesink ``` ```bash root@edison:~# wget http://www.wavsource.com/snds_2016-10-09_1797402624934163/animals/bear_growl_y.wav ``` ```bash root@edison:~# gst-launch-1.0 filesrc location=bear_growl_y.wav ! wavparse ! pulsesink Setting pipeline to PAUSED ... Pipeline is PREROLLING ... Pipeline is PREROLLED ... Setting pipeline to PLAYING ... New clock: GstPulseSinkClock Got EOS from element "pipeline0". Execution ended after 0:00:04.593866303 Setting pipeline to PAUSED ... Setting pipeline to READY ... Setting pipeline to NULL ... Freeing pipeline ... root@edison:~# ``` ```bash root@edison:~# gst-launch-1.0 filesrc location=bear_growl_y.wav ! decodebin ! audioconvert ! audioresample ! pulsesink ``` ```bash root@edison:~# gst-launch-1.0 filesrc location=bear_growl_y.wav ! decodebin ! pulsesink ``` ```bash root@edison:~# bluetoothctl [NEW] Controller 98:4F:EE:04:21:2A edison [default] [NEW] Device 58:51:00:00:41:4D BT MINI [bluetooth]# ``` ```bash [bluetooth]# paired-devices Device 58:51:00:00:41:4D BT MINI ``` ```bash [bluetooth]# remove 58:51:00:00:41:4D [bluetooth]# paired-devices Device 58:51:00:00:41:4D BT MINI Device has been removed [CHG] Device 58:51:00:00:41:4D Connected: no [DEL] Device 58:51:00:00:41:4D BT MINI [bluetooth]# paired-devices [bluetooth]# ``` --- # Agent Instructions This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. 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