[Bug 42546] DSOUND_PrimaryOpen() incorrect set buf size

https://bugs.winehq.org/show_bug.cgi?id=42546

--- Comment #12 from Huw Davies  ---
(In reply to Ivan_83 from comment #11)
> But mixer module need more checks.
> I m move up check in DSOUND_PerformMix()
>    if (maxq > device->buflen)
>    	maxq = device->buflen;
> and then make a test: set
>             new_buflen = sizeof(float) * (max(aclen, (3 * fraglen)) /
> wfx->nBlockAlign);
> and got small noises and crash on exit.

The problem with this is that maxq corresponds to bytes
in the audio client buffer, while buflen is bytes in the
float buffer, so you're not comparing like with like.

I've sent in four patches which tidy this up by using
frame counts.  The final one of them fixes an issue with
the initial assignment of maxq (now called 'frames').