[MinnowBoard] Audio playback through jack line output

[Darren Hart]

Great! Thanks for reporting back on the solution.
-- 
Darren Hart Open Source Technology Center
darren.hart at intel.com             Intel Corporation

From:  Robert <robertdegruijl at hotmail.com>
Reply-To:  MinnowBoard Development and Community Discussion
<elinux-minnowboard at lists.elinux.org>
Date:  Tuesday, May 13, 2014 at 19:07
To:  MinnowBoard Development and Community Discussion
<elinux-minnowboard at lists.elinux.org>
Subject:  Re: [MinnowBoard] Audio playback through jack line output

> Problem solved: I installed alsa-lib-1.0.9 which provided the required
> snd_pcm_* functions. Thanks!
> 
> 
> From: robertdegruijl at hotmail.com
> To: elinux-minnowboard at lists.elinux.org
> Date: Mon, 12 May 2014 22:04:09 -0700
> Subject: Re: [MinnowBoard] Audio playback through jack line output
> 
> Hey Darren, thanks for your swift reply.
> 
> The audio HW on the Minnowboard is working, speaker-test and aplay produce
> audio.
> 
> opkg -list shows that the alsa-utils package is available and installed., no
> other alsa stuff is available in my Angstrom image.
> 
> /usr/libs also shows I have libasound.so
> 
> 
> But, now to write a c-program sending PCM data to the audio device, I think I
> need to use functions like snd_pcm_open (according to for example
> http://equalarea.com/paul/alsa-audio.html) which is defined in
> /usr/include/alsa/asoundlib.h, but this file is not part of the Angstrom image
> I have.
> 
> Do I need to install another alsa related package? Is there an easier way of
> simply sending 8-bit unsigned PCM to the audio device? (It used to be so easy
> with OSS ;-)
> 
> Thanks!
> 
>> > Date: Mon, 12 May 2014 10:25:57 -0700
>> > From: dvhart at linux.intel.com
>> > To: elinux-minnowboard at lists.elinux.org
>> > Subject: Re: [MinnowBoard] Audio playback through jack line output
>> > 
>> > From:  Robert <robertdegruijl at hotmail.com>
>> > Reply-To:  MinnowBoard Development and Community Discussion
>> > <elinux-minnowboard at lists.elinux.org>
>> > Date:  Monday, May 12, 2014 at 10:08
>> > To:  "." <elinux-minnowboard at lists.elinux.org>
>> > Subject:  [MinnowBoard] Audio playback through jack line output
>> > 
>> > 
>>> > >Hi
>>> > >I'm trying to do basic audio playback through the Minnowboard jack line
>>> > >output, using a c-program sending a PCM data to an audio device. Does
>>> > >anyone have documentation or tips on how to do this using the standard
>>> > >Linux Angstrom image from minnowboard.org?
>>> > >
>>> > >The only playback device I see is /dev/snd/pcmC0D0p, but opening and
>>> > >sending PCM data to this fails (write returns -1).
>>> > >
>>> > >I cannot find any linux OSS modules (modprobe snd-pcm-oss) in the
>>> > >Angstrom distribution to create a /dev/dsp or /dev/audio device
>>> > >
>>> > >I don't seem to have a full ALSA support either, I don't have
>>> > >/usr/include/alsa/asoundlib.h. I only have  /usr/include/sound/asound.h
>>> > >which does not have the basic function calls such as snd_pcm_open().
>>> > >
>>> > >Is there a standard way of PCM audio playback on the Angstrom OS image
>>> > >for Minnowboard, or do I need to install additional audio drivers and/or
>>> > >ALSA modules?
>>> > >
>>> > >Thanks!
>>> > >       
>> > 
>> > Hi Robert,
>> > 
>> > I believe your question is fundamentally an Alsa programming / Angstrom
>> > question - more than a minnow question (which is fine), but I did want to
>> > confirm that your device is working physically. Do the speakertest and/or
>> > aplay programs successfully send output to the device?
>> > 
>> > Koen could say for sure, but typically the headers for packages in
>> > Angstrom or in -dev named versions of the base packages.
>> > 
>> > For example, you can use opkg to list the available packages, are there
>> > some alsa -dev package available to install?
>> > 
>> > 
>> > --
>> > Darren Hart Open Source Technology Center
>> > darren.hart at intel.com Intel Corporation
>> > 
>> > 
>> > 
>> > 
>> > _______________________________________________
>> > elinux-MinnowBoard mailing list
>> > elinux-MinnowBoard at lists.elinux.org
>> > http://lists.elinux.org/mailman/listinfo/elinux-minnowboard
>        
> 
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