[alsa-devel] A minimal playback program does't work on my system

[Michael Trimarchi]

Hi

hate gmail

On Sat, Aug 16, 2014 at 1:50 PM, Michael Trimarchi
<michael at amarulasolutions.com> wrote:
> Hi
>
> On Fri, Aug 15, 2014 at 7:31 PM, Michael Trimarchi
> <michael at amarulasolutions.com> wrote:
>> Hi
>>
>> Il 15/ago/2014 19:20 "Carpon frédéric" <frederic.carpon at yahoo.fr> ha
>> scritto:
>>
>>
>>>
>>> Hello,
>>>
>>> Yesterday i have written.
>>> I answer to everybody. I am new and I don't know if there is special rule.
>>> Note : It would be good to have a forum to see the messages and answers in
>>> a pretty form.
>>>
>>> the programme in c comes from
>>>
>>> http://equalarea.com/paul/alsa-audio.html
>>> you can download it at
>>> https://mon-partage.fr/f/uvyw39wo/
>>>
>>> To answer to Michael i have sound in my HDMI with that :
>>> >speaker-test -c2 -D hw:0,0
>>>
>>> so i did that
>>> >gcc -o    minimal_playback     minimal_playback.c     -lasound (warning
>>> > comes)
>>> and
>>> >./minimal_playback "plughw:0,0"
>>> and i have this result :
>>> >Error of segmentation
>>>
>
> if ((err = snd_pcm_hw_params_set_rate_near (playback_handle,
> hw_params, 44100, 0)) < 0) {
> fprintf (stderr, "cannot set sample rate (%s)\n",
> snd_strerror (err));
> exit (1);
> }

The error is how this function is called. Just change from
snd_pcm_hw_params_set_rate_near

to

snd_pcm_hw_params_set_rate

let the example compile without warning

gcc playback.c `pkg-config --cflags --libs alsa` -o playback
./playback plughw:0,0

This example take some byte not initialized on the stack so it's not
what you want. If you increase
the loop from 10 to 1024 you have a nice noise

Michael





>
>
>
>
>
>>> Where i can an exemple with the possibility to do something like that  :
>>> >./minimal_playback  "plughw:0,0"  "mywave.wav"
>>>
>>
>> aplay source code
>>
>> I ask to test your small program on PC. Now I don't know about segmentation
>> fault and I'm answering using mobile now. I will check tomorrow
>>
>> Michael
>>
>>>
>>> Thank you for your help
>>> _______________________________________________
>>> Alsa-devel mailing list
>>> Alsa-devel at alsa-project.org
>>> http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
>
>
>
> --
> | Michael Nazzareno Trimarchi                     Amarula Solutions BV |
> | COO  -  Founder                                      Cruquiuskade 47 |
> | +31(0)851119172                                 Amsterdam 1018 AM NL |
> |                  [`as] http://www.amarulasolutions.com               |



-- 
| Michael Nazzareno Trimarchi                     Amarula Solutions BV |
| COO  -  Founder                                      Cruquiuskade 47 |
| +31(0)851119172                                 Amsterdam 1018 AM NL |
|                  [`as] http://www.amarulasolutions.com               |