> Date: Sat, 18 May 2013 12:36:57 -0500
> From: Perry Kivolowitz <pe...@kivolowitz.com>
> To: alsa-user@lists.sourceforge.net
>
> Hi All,
>
> I have written an ALSA output program which is producing garbled results.
>
> The results are the same when I wrote an equivalent program using 
> RtAudio / ALSA.
>
> The platform is an RK3066 based stick computer running Picuntu.
>
> The sound file is processed by sndfile. Playing a sin wav at 375 Hz also 
> produces unexpected results.
>
> Playing the sound file with aplay works fine.
>
> ...

On the off chance you haven't already tried this, if it were
my program I would instrument the program to print out buffer
pointers for each packet of samples sent to Alsa (or wherever
you're sending the data).  If it were my program, it would
likely turn out that I had made some errors in pointer
arithmetic or something like that.

HTH

Robert

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