[alsa-devel] alsa driver api

[James Courtier-Dutton]

Michel Benoit wrote:
> Hi
> 
> Does anyone have some code examples that show how to send pcm samples
> directly to an alsa driver.  I'm (still) having trouble building/using
> alsa-lib and I want to make sure that my driver works correctly. If I
> understand correctly it is possible to send sound samples using the
> alsa driver api only (no alsa-lib).
> 
> All I want to do for now is send a fixed sine wave to the driver. I
> saw some code snippets that seemed to do just that in a recent email
> on this list but it would help a lot if I could have a look at the
> complete application.
> 
> Thanks,
> 
> Michel

There is an alsa tool already available to do the task.
It is called "speaker-test"
speaker-test -c2 -Dplug:front -twav    (voices)
speaker-test -c2 -Dplug:front -tsine   (sine wave)
speaker-test -c2 -Dplug:front -tpink   (pink noise)

You can then use any device name you wish to test.

James