Connecting RPi4 to Mobile via Bluetooth for Audio Streaming in PulseAudio

[Dhruv Menon]

Hi PulseAudio team,


Hope you are having a good day.


I’m trying to connect my Raspberry Pi 4 and mobile phone via Bluetooth to
access both media audio and phone call audio (A2DP and HFP), with the goal
of streaming this audio using GStreamer.


I successfully connected my Raspberry Pi to my phone and managed to get
both HFP and A2DP profiles. Running pacmd list-cards gave the following
output:


    index: 5
>         name: <bluez_card.2C_BE_EB_8B_F2_D7>
>         driver: <module-bluez5-device.c>
>         owner module: 39
>         properties:
>                 device.description = "melphone"
>                 device.string = "2C:BE:EB:8B:F2:D7"
>                 device.api = "bluez"
>                 device.class = "sound"
>                 device.bus = "bluetooth"
>                 device.form_factor = "phone"
>                 bluez.path = "/org/bluez/hci1/dev_2C_BE_EB_8B_F2_D7"
>                 bluez.class = "0x5a420c"
>                 bluez.alias = "melphone"
>                 device.icon_name = "audio-card-bluetooth"
>                 bluetooth.codec = "CVSD"
>         profiles:
>                 a2dp_source: High Fidelity Capture (A2DP Source) (priority
> 20, available: unknown)
>                 headset_audio_gateway: Headset Audio Gateway (HSP)
> (priority 10, available: unknown)
>                 off: Off (priority 0, available: yes)
>         active profile: <headset_audio_gateway>
>         sinks:
>                 bluez_sink.2C_BE_EB_8B_F2_D7.headset_audio_gateway/#5:
> melphone
>         sources:
>
> bluez_sink.2C_BE_EB_8B_F2_D7.headset_audio_gateway.monitor/#14: Monitor of
> melphone
>                 bluez_source.2C_BE_EB_8B_F2_D7.headset_audio_gateway/#15:
> melphone
>         ports:
>                 phone-output: Phone (priority 0, latency offset 0 usec,
> available: unknown)
>                 phone-input: Phone (priority 0, latency offset 0 usec,
> available: unknown)


To test audio streaming, I used the following GStreamer command:

> gst-launch-1.0 -v pulsesrc
> device=bluez_source.2C_BE_EB_8B_F2_D7.headset_audio_gateway ! audioconvert
> ! audioresample ! wavenc ! filesink location=output.wav


However, I encountered an issue: the media doesn’t play. The Video is not
paused, but playback doesn’t progress beyond 0:00.


Any guidance on resolving this would be greatly appreciated!

I am happy to provide any more info required.


Best regards,
Dhruv Menon
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