[Bug 14717] resampled sound is horrible

[wine-bugs at winehq.org]

http://bugs.winehq.org/show_bug.cgi?id=14717

--- Comment #230 from Alexander E. Patrakov <patrakov at gmail.com> 2011-11-11 02:52:02 CST ---
(In reply to comment #228)
> CPU usage is quite high (over 20%) for vlc  especially when user mis-configure
> default sample rate to 96000Hz when the sound card only support 48000Hz 
> 
> when normal usage is only 1% for vlc for playing 16bit 44100Hz

Yes, this is expected, and, I as already told, this is a necessary consequence
of matching the default Windows resampling quality without MMX/SSE acceleration
which I cannot implement anyway. That's why I still insist that, in the ideal
world, resampling and mixing the sound should be left to the underlying
platform libraries. If they are not good enough (as evidenced e.g. with the
"ton of sliders" UI issue), we should talk to the authors of these libraries to
make the API suitable for wine needs, not reinvent the wheel as I have done
with my patch. However, that's a long-term plan.

You can tweak the constants in firgen.c to lower the CPU usage, but, of course,
the resulting sound will be worse than in Windows. Try e.g. these values:

exp_width = 15.0

lobes_per_wing = 11

approx_bandwidth = 0.85

fir_step = 120  // does not affect CPU usage

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