Re: Test device for automated testing

[Uli Franke <uli.franke@weiss.ch>]

On 16.09.2015 16:30, Clemens Ladisch wrote:
> Uli Franke wrote:
>> I tried the "null" but this fails when setting hw parameters with an
>> assertion.
> 
> In theory, the null device does not have any restrictions.  But an
> assertion indicates a programming error (somewhere).  What is the
> message, and what are the hw parameters?

The assertion fails with

pcm_params.c:2360: _snd_pcm_hw_params_internal: Assertion `err >= 0' failed.

There's only a single result on google [1] which discusses this
assertion but the thread doesn't result in any meaningful conclusion.

I assembled a small test program which causes this very assertion to fail.

#include <alsa/asoundlib.h>

int main ()
{
	snd_pcm_hw_params_t *params;
	snd_pcm_t *pcm;

	snd_pcm_open(&pcm, "null", SND_PCM_STREAM_PLAYBACK, 0);
	snd_pcm_hw_params_malloc(&params);
	snd_pcm_hw_params_any(pcm, params);
	snd_pcm_hw_params(pcm, params);

	return 0;
}

I appended some system specs [2] (in case you should need more, just let
me know).

Regards
Uli

____
[1] http://sourceforge.net/p/cmus/mailman/message/32707782/
[2] System specs:

uli@ankerklause:~/.../dlna/wdmr$ uname -a
Linux ankerklause 3.16.0-46-generic #62~14.04.1-Ubuntu SMP Tue Aug 11
16:28:19 UTC 2015 i686 i686 i686 GNU/Linux

uli@ankerklause:~/.../dlna/wdmr$ aptitude show libasound2
Package: libasound2
State: installed
Automatically installed: yes
Multi-Arch: same
Version: 1.0.27.2-3ubuntu7
Priority: optional
Section: libs
Maintainer: Ubuntu Developers <ubuntu-devel-discuss@lists.ubuntu.com>
Architecture: i386
Uncompressed Size: 1'208 k
Depends: libc6 (>= 2.16), libasound2-data (>= 1.0.27.2-3ubuntu7)
PreDepends: multiarch-support
Suggests: libasound2-plugins (>= 1.0.24)
Breaks: bluez-alsa (<= 4.94-2), libasound2-plugin-equal (<= 0.6-1),
libasound2-plugins (< 1.0.24)
Provided by: liboss4-salsa-asound2
Description: shared library for ALSA applications
This package contains the ALSA library and its standard plugins, as well
as the required configuration files.

ALSA is the Advanced Linux Sound Architecture.
Homepage: http://www.alsa-project.org/