[Bug 20604] dsound tests fail under pulseaudio

[wine-bugs at winehq.org]

http://bugs.winehq.org/show_bug.cgi?id=20604


Raymond <superquad.vortex2 at gmail.com> changed:

           What    |Removed                     |Added
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                 CC|                            |superquad.vortex2 at gmail.com




--- Comment #5 from Raymond <superquad.vortex2 at gmail.com>  2010-03-14 21:13:38 ---
This is because most sound cards have fixed buffer size ( especially those
hardware mixing sound cards which are designed for dsound )

since wavein.c and waveout.c of winealsa.drv use some magic number for
period_time and buffer_time and snd_pcm_hw_params_set_period_time_near() ,
snd_pcm_hw_params_set_buffer_time_near()

using different rate will assign different buffer size and this is why the test
fail

Nowadays , the most common hda driver also has a constraint of period_size must
be multiple of 128 bytes ( PCIe brust size ) , so you will not get the exact
period time you want

Most application developer prefer to use time instead of bytes for the
application but they seem to neglect the hardware limitation of the drivers 

(e.g. DMA page size of x86 when you use mmap )

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