Hi!
I did further testing, also with another headset (Nokia BH-208) where I could
get sound working with still some errors.
It only possible to play correct sampled date with a rate of 8000, all other
sample rates fail. If i test with another sampe-rate there is no correct
output. I thought alsa does the correct resampling, but it does not
In my ~/.asoundrc I have included a plug device:
pcm.btheadset {
type plug
slave {
pcm btheadsetraw
}
}
pcm.btheadsetraw {
type bluetooth
device xx:xx:xx:xx:xx:xx
profile "auto"
}
1)
Play a file with 8000 samples/s, sound output is fine:
aplay -v -B 100000 -Dplug:btheadset Front_Right_resampled8000.wav
Playing WAVE 'Front_Right_resampled8000.wav' : Signed 16 bit Little Endian,
Rate 8000 Hz, Mono
Plug PCM: Plug PCM: Bluetooth Audio Device
Its setup is:
stream : PLAYBACK
access : RW_INTERLEAVED
format : S16_LE
subformat : STD
channels : 1
rate : 8000
exact rate : 8000 (8000/1)
msbits : 16
buffer_size : 800
period_size : 200
period_time : 25000
tstamp_mode : NONE
period_step : 1
avail_min : 200
start_threshold : 800
stop_threshold : 800
silence_threshold: 0
silence_size : 0
boundary : 1677721600
-------------------------------------------------------------------------------------
2)
Play a file with 48000 samples/s, sound output is NOT ok:
aplay -v -B 100000 -Dplug:btheadset Front_Righ.wav
Playing WAVE 'Front_Right.wav' : Signed 16 bit Little Endian, Rate 48000 Hz,
Mono
Plug PCM: Plug PCM: Rate conversion PCM (8000, sformat=S16_LE)
Its setup is:
stream : PLAYBACK
access : RW_INTERLEAVED
format : S16_LE
subformat : STD
channels : 1
rate : 48000
exact rate : 48000 (48000/1)
msbits : 16
buffer_size : 4800
period_size : 1200
period_time : 25000
tstamp_mode : NONE
period_step : 1
avail_min : 1200
start_threshold : 4800
stop_threshold : 4800
silence_threshold: 0
silence_size : 0
boundary : 1258291200
Slave: Bluetooth Audio Device
Its setup is:
stream : PLAYBACK
access : MMAP_INTERLEAVED
format : S16_LE
subformat : STD
channels : 1
rate : 8000
exact rate : 8000 (8000/1)
msbits : 16
buffer_size : 800
period_size : 200
period_time : 25000
tstamp_mode : NONE
period_step : 1
avail_min : 200
start_threshold : 800
stop_threshold : 800
silence_threshold: 0
silence_size : 0
boundary : 1677721600
------------------------------------------------------------------------------
Why does alsa not sample correct? Do you need still more information to help
me solve the Problem?
thanks,
Stefan
> Hi!
>
> I am configuring a Bluetooth Headset (Nokia BH-101) with alsa. Pairing with
> the device seems to be ok, but the sound-output and input is not.
>
> Playing a sound with
> aplay -D btheadset -B 100000 /usr/share/sounds/alsa/Front_Right.wav
> produces a loud noise in the headset, only a recongnizeable distored sound
> is played in the background. It seems to me being a sampling-rate problem.
>
> A similar problem exists when i try to record a sound with arecord, a
> sample file is here: http://members.aon.at/astronom/files/test_bt_rec.wav
> It is an 16bit, mono PCM file with 8000Hz.
> Can anybody speziefie the problem when litening to this file. (it is a
> count-up until 10 - in german)
>
> My ~/.asoundrc:
> pcm.btheadset {
> type bluetooth
> device 00:xx:xx:xx:xx:xx
> profile "voice"
> }
>
> aplay --version
> aplay: version 1.0.16 by Jaroslav Kysela <perex@xxxxxxxx>
> (it is from Debian lenny)
>
> thanks,
> Steve
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