[Bluez-users] plugz: snd_pcm_hw_params_set_rate(8287) failed: Invalid argument

[Bluez-users] plugz: snd_pcm_hw_params_set_rate(8287) failed: Invalid argument

[Wolfgang Wershofen]

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Hi,

I'm rather new to using bluetooth devices but I successfully managed to
get my headset running using plugz. I use it for telephony purposes with
twinkle (http://www.twinklephone.com).

I am able to hear people and talk to them during the phone call without
problems, but I can't hear the ringtone created by twinkle on my
headset. In the log files, I find the following error message:

snd_pcm_hw_params_set_rate(8287) failed: Invalid argument

After that message, twinkle stops generation of the ringtone and I am
left in silence until the phone line is established.
In most cases, I will miss the first words from the other side, because
the headset daemon returned to idle state while I was waiting and has to
get back to streaming mode upon call reception.

I'm running on 64-bit OpenSuSE 10.2 with kernel 2.6.18 (SCO-patch
applied). bluez-libs and bluez-utils is at 3.7, alsa at 1.0.13.
I got bluetooth-alsa from CVS on Feb, 6th and installed it as described.
My Dongle is a Level-One MDU-0005 (CSR chipset) and I have to different
headsets, a JABRA BT-200 and a B-Speech Vitac. The Problem occurs with
both of them.

I don't know, if this is a plugz issue or a twinkle issue and I didn't
find anything related on the net.

Any hints on this?

thx
Wolfgang

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Re: [Bluez-users] plugz: snd_pcm_hw_params_set_rate(8287) failed: Invalid argument

[Wolfgang Wershofen]

Am Dienstag, 20. Februar 2007 schrieb Wolfgang Wershofen:
> Hi,
>
> I'm rather new to using bluetooth devices but I successfully managed to
> get my headset running using plugz. I use it for telephony purposes with
> twinkle (http://www.twinklephone.com).
>
> I am able to hear people and talk to them during the phone call without
> problems, but I can't hear the ringtone created by twinkle on my
> headset. In the log files, I find the following error message:
>
> snd_pcm_hw_params_set_rate(8287) failed: Invalid argument
>
(...)
> I don't know, if this is a plugz issue or a twinkle issue and I didn't
> find anything related on the net.

Meanwhile, I got an answer from the author of twinkle as follows:

---- < snip > -----------------------------------------------------------
This error shows that setting the soundcard to an exact sample
rate of 8287 fails (this sample rate comes from ringback.wav).
Twinkle uses this call to set an exact rate:

err =3D snd_pcm_hw_params_set_rate (pcm_ptr, hw_params, sample_rate, 0)

This happens on some soundcard and is not fatal, as Twinkle
next instructs the soundcard to pick a lower sampe rate
that it can suppor with this call:

err =3D snd_pcm_hw_params_set_rate (pcm_ptr, hw_params, sample_rate, -1)

The -1 argument indicates that =A0the soundcard may pick a lower
sample rate. It seems that your alsa does not accept this parameter.
---- < snap > -----------------------------------------------------------

I got around this problem by supplying twinkle with a wav audio file with =

exactly 8000 Hz sample rate and now it works.

But the question still remains: Why is the setting of a sample rate not =

possible with plugz?

cu
Wolfgang

-- =

Geek by nature - Linux by choice

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