Multiple simultaneous audio streams?

I am working on a project where it would be desirable to have audio streams going to more than one SCO audio device at a time. My quick test
today of playing a WAV file with mplayer to two different devices didn't
work and bluetoothd was reporting "connection refused" when I tried to get the second stream going. Once the first playback finished, I was able to then play to the second device.

So, I suppose m question is if BlueZ supports audio to multiple SCO devices at the same time? If not, what might be involved in making it work?

Hi,

Quoted 9 lines

I am working on a project where it would be desirable to have audio streams going to more than one SCO audio device at a time. My quick test
today of playing a WAV file with mplayer to two different devices didn't
work and bluetoothd was reporting "connection refused" when I tried to get the second stream going. Once the first playback finished, I was able to then play to the second device.

Quoted 4 lines

So, I suppose m question is if BlueZ supports audio to multiple SCO devices at the same time? If not, what might be involved in making it work?

do you wanna do speech quality or CD quality audio streaming?

And yes, BlueZ does support it, but there are limitations from the Bluetooth radio. So you really need to know what you wanna do.

Regards

Marcel

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I am working on a project where it would be desirable to have audio
streams going to more than one SCO audio device at a time. My quick test today of playing a WAV file with mplayer to two different devices didn't work and bluetoothd was reporting "connection refused" when I tried to get the second stream going. Once the first playback finished, I was able to then play to the second device.

So, I suppose m question is if BlueZ supports audio to multiple SCO devices at the same time? If not, what might be involved in making it work?

Quoted 10 lines · deker

I am working on a project where it would be desirable to have audio
streams going to more than one SCO audio device at a time. My quick test today of playing a WAV file with mplayer to two different devices didn't work and bluetoothd was reporting "connection refused" when I tried to get the second stream going. Once the first playback finished, I was able to then play to the second device.

So, I suppose m question is if BlueZ supports audio to multiple SCO devices at the same time? If not, what might be involved in making it work?

If you're using BlueZ 4.17 or later you'll need to add something like MaxConnections=2
to the [Headset] section in /etc/bluetooth/audio.conf to be able to create a service level connection to more than 1 device.

Johan

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I've changed the MaxConnections setting and now I'm seeing something different (this must mean I'm getting closer :)

I'm using the following config/comandline to play audio:

audio.conf:
[General]
SCORouting=PCM
[Headset]
HFP=False
MaxConnections=2

~/.asoundrc:

pcm.bluetooth {
    type bluetooth
    device 00:0B:2E:D5:27:DA  
    profile auto
}
pcm.bluetooth2 {
    type bluetooth
    device 00:0B:2E:D4:EC:31
    profile auto
}

mplayer command lines:

mplayer -ao alsa:device=bluetooth test.wav
mplayer -ao alsa:device=bluetooth2 test.wav

Either execution of mplayer works properly as long as the other isn't streaming to the device. If one is already running, mplayer reports the following:

[AO_ALSA] alsa-lib: pcm_bluetooth.c:464:(bluetooth_hsp_hw_params) BT_SETCONFIGURATION failed : Input/output error(5) [AO_ALSA] Unable to set hw-parameters: Input/output error Could not open/initialize audio device -> no sound.
Audio: no sound
Video: no video

Exiting... (End of file)

Also, it seems that I'm losing the beginning of the sample in playback. I assume this is due to the delay of setting up the connection to the headset, but I was wondering if there was a way to avoid this.

Thanks,

-d

Quoted 21 lines · Johan Hedberg

Quoted 11 lines · deker

I am working on a project where it would be desirable to have audio
streams going to more than one SCO audio device at a time. My quick test today of playing a WAV file with mplayer to two different devices didn't work and bluetoothd was reporting "connection refused" when I tried to get the second stream going. Once the first playback finished, I was able to then play to the second device.

So, I suppose m question is if BlueZ supports audio to multiple SCO devices at the same time? If not, what might be involved in making it work?

If you're using BlueZ 4.17 or later you'll need to add something like MaxConnections=2
to the [Headset] section in /etc/bluetooth/audio.conf to be able to create a service level connection to more than 1 device.

Johan

Quoted 11 lines

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