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Hello,

We are trying to record and playback audio over bluetooth using alsa library and utils on ARM platform.

ALSA seems to be set up fine. Audio Playback over bluetooth is working well, recording does not work. arecord does not record silence but simply blocks after writing the 44 byte wave file header:

$ arecord -f cd test.wav
Recording WAVE 'test.wav' : Signed 16 bit Little Endian, Rate 44100 Hz, Stereo
(CTRL-C after a while)
Aborted by signal break...

$ ls -lh test.wav
-rw-r--r-- 1 user user 44 2011-03-10 16:46 test.wav

We also tried some arecord options (other sample formats or devices) without success.

Any hints what we are missing?

Regards,

Krunal

Hi Krunal,

Please provide us the details of your platform (hardware and software).

Thanks,

Sinoj

Hello Sinoj,

We are using AM3517 EVM from logicPD. We are using AM35x-OMAP35x PSP 03.00.01.06 and following wilink setup guide provided by logicpd to setup wlan and bluetooth. Audio playback steps are mentioned in Wilink setup guide but not for audio record.

Software Specification:

1. AM35x-OMAP35x PSP 03.00.01.06 which has "Linux am3517-evm 2.6.32" along with the wilink patches provided by logicpd
2. bluez-4.59.tar.gz alsa-lib-1.0.23.tar.bz2 alsa-utils-1.0.23.tar.bz2 as recommended in setup guide
   

Audio Playback over bluetooth is working well, recording does not work. arecord does not record silence but simply blocks after writing the 44 byte wave file header:

Is audio recording over bluetooth is tested on AM3517 EVM with AM35x-OMAP35x PSP 03.00.01.06 SDK.

Following is my /etc/asound.conf

pcm.rawbluetooth {
        @args [ ADDRESS ]
        @args.ADDRESS {
                type string
        }
        type bluetooth
        device $ADDRESS
}

pcm.bluetooth {
        @args [ ADDRESS ]
        @args.ADDRESS {
                type string
        }
        type plug
        slave {
                pcm {
                        type bluetooth
                        device $ADDRESS
                }
        }
}

Any hints what we are missing?

Regards,

Krunal

Hi Krunal,

We don't have the AM3517 EVM from Logicpd. We do support OMAP3 EVM from Mistral+WL1271 solution. I hope someone else will respond to help you.

Thanks,

Sinoj

Hello,

Thanks for the reply.

We are using AM3517 with WL1271 only. I guess I am missing some basic configurations. May be some alsa or HCI command configuration. Can you please provide me set of steps where in I can configure WL1271 and record and playback audio over bluetooth.

--

Regards,

Krunal

Dear Sergey

Could you help me and tell - what I have to enable in kernel - that A2DP headset can work with aplay...

now bluetoothhd - still activ... all servicec activate, but aplay - dont work with BT ... 

Hello Nikolay,

1. Kernel bluetooth configuration

The simplest way is to enable all the kernel configuration options under Networking support -> Bluetooth subsystem support.

2. BlueZ (bluetoothd)

You have to pair bluetooth headset with bluetooth service. If you are not using any existing bluetooth GUI (e.g. gnome bluetooth applet), then you will have to use command-line agent to pair with your headset. The simplest agent can be found in bluetoothd source tree: test/simple-agent.This is how to use it:

# test/simple-agent hci0 XX:XX:XX:XX:XX:XX

Now I don't remember exactly, but you might also need the following command after pairing:

#  test/test-audio connect XX:XX:XX:XX:XX:XX

3. Audio: here I consider only alsa configuration

Create or modify existing alsa configuration ~/.asoundrc adding the following lines:

pcm.bt {
    type bluetooth
    device XX:XX:XX:XX:XX:XX
    profile hifi
}

You may play wav file using 'aplay' utility:

# aplay -D bt /path/to/test.wav

or mplayer:

# mplayer -ao alsa:device=bt /path/to/test.mp3

Thanks,

Sergey

3036.BT_Log.txt

Sergey I attach BT_LOG.txt..

I start system..  and make:

hciconfig hci0 piscan
hcitool cmd 0x3f 0x210 0x01 0x30 0xD0 0x02 0x01

rm  /usr/var/run/messagebus.pid
rm  /usr/var/run/dbus/pid
sleep 1
dbus-daemon --system &
sleep 2
bluetoothd -nd &
sleep 5
agent --path /org/bluez/agent 0000 &

and - BT headset - after anable it automatical detected OS and connection...

But - aplay - cant connect to bluetooth $(