Continued SCO audio issues...

I posted a while back about having some issues getting SCO audio to work on some Compulab em-x270 boards. Well, we're still not there, but we've tried a lot more things. I'm going to describe the problem in some more detail now in the hopes that somebody here can help point me in a direction to get this working.

Symptoms:

- Everything involved (bt headset, ALSA, aplay/mplayer/pulseaudio,
etc) seems to think everything is working.
- No sound comes out of the headset. We hear a hissing from the
headset during actual audio playback (or when I have pulseaudio talking to it via 'module-alsa-sink' and the sink is not suspended).

Config(s) Tested:

- Kernels: 2.6.23, 2.6.26, 2.6.27
- Bluez: 3.26, 3.36, 4.12, 4.18
- ALSA drivers: as shipped w/ kernels above

We've been through about every possible combination of the above. We've tried hci_usb and btusb. We've tested with 3 models of bt headset and 2 development boards. For some reason, the ONLY place I can make SCO audio work is under a stock Ubuntu 8.10 (which uses Bluez 4.12, kernel 2.6.27, and ALSA 1.0.17 for the record).

I'm stumped. Here is some sample output from various pieces as we try to play a file. Right now we're using Bluez 3.36 (getting 4.x running on this platform was a bit of a PITA and was somewhat unstable so we backed out to what currently ships with openembedded)

We've tried with separate USB dongles (using the same chipset, that works under Ubuntu 8.10) so it's not the onboard BT chipset...

# hciconfig hci0 version
hci0:    Type: USB
    BD Address: 00:02:5B:00:A5:A5 ACL MTU: 310:10 SCO MTU: 64:8
    HCI Ver: 2.0 (0x3) HCI Rev: 0xc5c LMP Ver: 2.0 (0x3) LMP Subver: 0xc5c
    Manufacturer: Cambridge Silicon Radio (10)

# hciconfig hci0 revision
hci0:    Type: USB
    BD Address: 00:02:5B:00:A5:A5 ACL MTU: 310:10 SCO MTU: 64:8
    Unified 21e
    Chip version: BlueCore4-ROM
    Max key size: 128 bit
    SCO mapping:  PCM

~/.asoundrc:

pcm.bt {
        type bluetooth
        device 00:0B:2E:D5:27:DA
        profile voice
}

pcm.rbt {
        type plug
        slave {
                pcm bt
        }
}

/etc/bluetooth/audio.conf:
[General]
SCORouting=PCM

[Headset]
HFP=false

Pertinent output of "hcid -n -d" (this is what happens when I actually try to play audio with "aplay -D bt -f S16_LE test.wav". Yes, the test wavfile is 8Khz S16_LE PCM WAV audio):

hcid[1383]: Accepted new client connection on unix socket (fd=22) hcid[1383]: Audio API: received BT_GETCAPABILITIES_REQ hcid[1383]: Audio API: sending BT_GETCAPABILITIES_RSP hcid[1383]: Audio API: received BT_SETCONFIGURATION_REQ hcid[1383]: config sco - device = 00:0B:2E:D5:27:DA access_mode = 2 hcid[1383]: State changed /org/bluez/audio/device0:
HEADSET_STATE_DISCONNECTED -> HEADSET_STATE_CONNECT_IN_PROGRESS hcid[1383]: /org/bluez/audio/device0: Connecting to 00:0B:2E:D5:27:DA channel 2
hcid[1383]: link_key_request (sba=00:02:5B:00:A5:A5, dba=00:0B:2E:D5:27:DA) hcid[1383]: kernel auth requirements = 0x00
hcid[1383]: stored link key type = 0x00
hcid[1383]: /org/bluez/audio/device0: Connected to 00:0B:2E:D5:27:DA hcid[1383]: State changed /org/bluez/audio/device0:
HEADSET_STATE_CONNECT_IN_PROGRESS -> HEADSET_STATE_CONNECTED hcid[1383]: State changed /org/bluez/audio/device0:
HEADSET_STATE_CONNECTED -> HEADSET_STATE_PLAY_IN_PROGRESS hcid[1383]: SCO socket opened for headset /org/bluez/audio/device0 hcid[1383]: SCO fd=24
hcid[1383]: Audio API: sending BT_SETCONFIGURATION_RSP hcid[1383]: State changed /org/bluez/audio/device0:
HEADSET_STATE_PLAY_IN_PROGRESS -> HEADSET_STATE_PLAYING hcid[1383]: Audio API: received BT_STREAMSTART_REQ
hcid[1383]: Audio API: sending BT_STREAMSTART_RSP
hcid[1383]: Audio API: sending BT_STREAMFD_IND
hcid[1383]: Unix client disconnected (fd=22)
hcid[1383]: State changed /org/bluez/audio/device0:
HEADSET_STATE_PLAYING -> HEADSET_STATE_CONNECTED
hcid[1383]: State changed /org/bluez/audio/device0:
HEADSET_STATE_CONNECTED -> HEADSET_STATE_DISCONNECTED

I'm open to any suggestions. If more info is needed, tell me what you'd like to see and I'll post it up.

Thanks in advance,

-d

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Hi Rob,

you never thought that routing the SCO packets via the chips internal PCM (instead of HCI) might be a problem if you wanna use ALSA?

Regards

Marcel

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Marcel,

I'm not certain I'm understanding you correctly. Are you saying that
audio SHOULD be routed through the HCI? We are currently routing the audio via the PCM via the "SCORouting=PCM"...I may have forgotten to put that into the message, but it is indeed in the config file.

Thanks,

-d

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Hi Rob,

then why are you messing with the ALSA plugin? Just use D-Bus to establish the connection.

Regards

Marcel

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I'd be happy to give it a shot. Could you direct me to some docs as to how do that?

Thanks,

-d

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I've done a little more looking and you are correct that my SCO routing on the embedded devices I'm using (Compulab EM-X270) is incorrect (hciconfig revision reports SCO routing to PCM rather than HCI). Unfortunately, bccmd doesn't seem to work right on this platform (I haven't dug into why yet) so I'm at a loss as to how to change it. Any suggestions are really appreciated.

Thanks,

-d

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Hi Rob,

you confused me now totally. So what do you wanna do actually?

SCO over PCM is for Bluetooth chips that are hardwired to a codec or DSP. These is default for mobile phones and most embedded devices.

SCO over HCI is for desktop/laptop system or for system with external Bluetooth hardware/dongles.

Regards

Marcel

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Ok, sorry for the confusion. :) We're using the Compulab EM-X270 SBC. It has a CSR BT chip on it that's connected to the machine via USB (a diagram of the basic interconnects in the system can be see in the document at http://www.compulab.co.il/x270em/download/x270-em-man.pdf).
So, as far as I know it should be working in a similar fashion to a desktop PC.

-d

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Hi Rob,

this mailing list using bottom-posting so please respect that and stop top-posting.

Regards

Marcel

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