A Minimal Playback Program does't work on my system

A Minimal Playback Program does't work on my system

[Carpon frédéric]

Hello,

I am new 

System : Raspberry
Linux: ArchLinuxArm

I would like to run this exemple of A Minimal Playback Program from here : Howto use the ALSA API
from the page Tutorials for application developers but there is a bug :
i have done
> pacman -sy
> pacman -s alsa-utils
 to install the last alas-utils
done gcc exemple.c -lasound (warning comes)
and ./a.out my_file.wav 
and the result is :
"AlSA lib pcm.2239:(and_pcm_open_noupdate) Unknown PCM my_file.wav "
cannot open audio device my_file.wav (No such file or directory)


Can you help me please ?

Re: A Minimal Playback Program does't work on my system

[Michael Trimarchi]

Hi

On Thu, Aug 14, 2014 at 6:42 PM, Carpon frédéric
<frederic.carpon@yahoo.fr> wrote:
> Hello,
>
> I am new
>
> System : Raspberry
> Linux: ArchLinuxArm
>
> I would like to run this exemple of A Minimal Playback Program from here : Howto use the ALSA API
> from the page Tutorials for application developers but there is a bug :
> i have done
>> pacman -sy
>> pacman -s alsa-utils
>  to install the last alas-utils
> done gcc exemple.c -lasound (warning comes)
> and ./a.out my_file.wav
> and the result is :
> "AlSA lib pcm.2239:(and_pcm_open_noupdate) Unknown PCM my_file.wav "
> cannot open audio device my_file.wav (No such file or directory)
>

I don't see the code, btw. Have you tested on a desktop?

Michael

>
> Can you help me please ?
> _______________________________________________
> Alsa-devel mailing list
> Alsa-devel@alsa-project.org
> http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
_______________________________________________
Alsa-devel mailing list
Alsa-devel@alsa-project.org
http://mailman.alsa-project.org/mailman/listinfo/alsa-devel

Re: A Minimal Playback Program does't work on my system

[Clemens Ladisch]

Carpon frédéric wrote:
> ./a.out my_file.wav
> "AlSA lib pcm.2239:(and_pcm_open_noupdate) Unknown PCM my_file.wav "

The parameter must be a sound device name (like "default").


Regards,
Clemens
_______________________________________________
Alsa-devel mailing list
Alsa-devel@alsa-project.org
http://mailman.alsa-project.org/mailman/listinfo/alsa-devel

A minimal playback program does't work on my system

[Carpon frédéric]

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

Where i can an exemple with the possibility to do something like that  :
>./minimal_playback  "plughw:0,0"  "mywave.wav"


Thank you for your help

Re: A minimal playback program does't work on my system

[Michael Trimarchi]

Hi

Il 15/ago/2014 19:20 "Carpon frédéric" <frederic.carpon@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
>
> 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@alsa-project.org
> http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
_______________________________________________
Alsa-devel mailing list
Alsa-devel@alsa-project.org
http://mailman.alsa-project.org/mailman/listinfo/alsa-devel

Re: A minimal playback program does't work on my system

[Michael Trimarchi]

Hi

On Fri, Aug 15, 2014 at 7:31 PM, Michael Trimarchi
<michael@amarulasolutions.com> wrote:
> Hi
>
> Il 15/ago/2014 19:20 "Carpon frédéric" <frederic.carpon@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);
}





>> 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@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               |
_______________________________________________
Alsa-devel mailing list
Alsa-devel@alsa-project.org
http://mailman.alsa-project.org/mailman/listinfo/alsa-devel

Re: 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@amarulasolutions.com> wrote:
> Hi
>
> On Fri, Aug 15, 2014 at 7:31 PM, Michael Trimarchi
> <michael@amarulasolutions.com> wrote:
>> Hi
>>
>> Il 15/ago/2014 19:20 "Carpon frédéric" <frederic.carpon@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@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               |
_______________________________________________
Alsa-devel mailing list
Alsa-devel@alsa-project.org
http://mailman.alsa-project.org/mailman/listinfo/alsa-devel

Re: A minimal playback program does't work on my system

[Joël Krähemann]

On Fri, 2014-08-15 at 18:19 +0100, Carpon frédéric wrote:
> 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
> 
> Where i can an exemple with the possibility to do something like that  :
> >./minimal_playback  "plughw:0,0"  "mywave.wav"
> 
> 
> Thank you for your help
> _______________________________________________
> Alsa-devel mailing list
> Alsa-devel@alsa-project.org
> http://mailman.alsa-project.org/mailman/listinfo/alsa-devel

Probably you want to use a library that does type and endianes
conversion like:

http://www.mega-nerd.com/libsndfile/