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BLUETOOTH SCO AUDIO DEVICE BLUETOOTH
BLUETOOTH SCO AUDIO DEVICE PLUS

The headset role of HSP is disabled, because otherwise PulseAudio and oFono would conflict as both would try to listen for new connections from audio gateway devices.

BLUETOOTH SCO AUDIO DEVICE PLUS

If oFono is running, the audio gateway role of HSP is enabled plus both HFP roles. In the default configuration, if oFono isn't running, only HSP is enabled. PulseAudio supports both HSP roles, and with oFono also both HFP roles. With PulseAudio versions older than 12.0 the audio can get badly out of sync when watching videos, however. When PulseAudio acts in the sink role, a source is created where applications can record from.Ī2DP works generally without a hassle. When PulseAudio acts in the source role, a sink is created where applications can play to. PulseAudio supports A2DP in both source and sink roles.

Hands-Free Unit role - the device with the speakers and microphone.

The HFP profile is typically used for cellular phone calls, and this is the device that is connected to the cellular network.

Audio Gateway role - the device that the hands-free device is connected to.

This is where the speakers and microphone are.

Headset role - the headset, obviously.

The HSP profile is typically used in phone calls, and this is the device that is connected to the cellular network (for cellular phone calls) or to the internet (for VoIP calls).

Audio Gateway role - the device that the headset is connected to.

Sink role - the device that receives audio.

Source role - the device that sends audio.

HFP (Hands-Free Profile) - same as HSP, but with additional functionality for managing phone calls.Įach of the profiles are further divided into two roles:.

HSP (HeadSet Profile) - phone-quality audio playback and recording, appropriate for phone calls.

A2DP (Advanced Audio Distribution Profile) - high-quality audio playback, appropriate for e.g.

BLUETOOTH SCO AUDIO DEVICE BLUETOOTH

A bluetooth device shows up in PulseAudio as a card, and the card will have some set of profiles depending on what bluetooth profiles the device supports, but the "bluetooth profile" "card profile" mapping is not one-to-one. Try not to confuse these with the "card profile" concept in PulseAudio. The bluetooth standard specifies three audio profiles. PulseAudio depends on BlueZ for all Bluetooth functionality, and additionally oFono is required for HFP support. HSP problem: the bluetooth sink and source are created, but no audio is being transmitted.

HSP problem: audio is silent or skipping.History of bluetooth features in PulseAudio.Using bluetooth when running PulseAudio in the system mode.