Re: [Alsa-user] playing / recording mono on a stereo-only hardware

[Jaroslav K. <pe...@pe...>]

On Sat, 30 Jan 2010, Guennadi Liakhovetski wrote:

> On Sat, 30 Jan 2010, Giuliano Pochini wrote:
>
>> On Sat, 30 Jan 2010 16:59:48 +0100 (CET)
>> Guennadi Liakhovetski <g.l...@gm...> wrote:
>>
>>> On Sat, 30 Jan 2010, Giuliano Pochini wrote:
>>>
>>>> On Fri, 29 Jan 2010 11:44:43 +0100 (CET)
>>>> Guennadi Liakhovetski <g.l...@gm...> wrote:
>>>>
>>>>>> Try something simpler:
>>>>>>
>>>>>> arecord -v -Dplughw:0 -c1 -r44100 -fS16_LE out.wav
>>>>>>
>>>>>> It prints the given parameters and, if the format is not supported by the
>>>>>> card, it also prints the choosen settings. In that case audio data is
>>>>>> transparently converted to the format you requested.
>>>>>> You shouldn't have to specify plughw: because it's the default.
>>>>>
>>>>> Unfortunately, didn't work:
>>>>
>>>> Did you try with "-Dplughw:0" ?
>>>
>>> Yes, I did, doesn't help.
>>
>> Does the driver uses rules to set hw params constraints ?  If so, there may
>> be an error there. If -for example- rule_format_given_channels() and
>> rule_channels_given_format() are not perfectly symmetrical then the plughw
>> plugin does not work.
>
> This is an ASoC driver (sound/soc), here's the code:

I don't see any issues here. Post 'aplay -v -Dplughw:0' log.

 					Jaroslav

-----
Jaroslav Kysela <pe...@pe...>
Linux Kernel Sound Maintainer
ALSA Project, Red Hat, Inc.