[Bug 14717] resampled sound is horrible

[wine-bugs at winehq.org]

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

--- Comment #80 from Raymond <superquad.vortex2 at gmail.com> 2010-12-27 02:55:56 CST ---
The answer is quite simple , the only wine audio driver which assign non-zero
value to DSACPS is wineoss.drv , 

but ALSA 's kernel OSS emulation does not enable DSP_CAP_MULTI and emu10k1 does
not work with wineoss any more after snd-emu10k1 need to use "front" device for
playback to route the stereo to "front" jack

 845 #ifdef DSP_CAP_MULTI    /* not every oss has this */
 846         /* check for hardware secondary buffer support (multi open) */
 847         if ((arg & DSP_CAP_MULTI) &&
 848             (ossdev->out_caps.dwSupport & WAVECAPS_DIRECTSOUND)) {
 849             TRACE("hardware secondary buffer support available\n");
 850 
 851             ossdev->ds_caps.dwMaxHwMixingAllBuffers = 16;
 852             ossdev->ds_caps.dwMaxHwMixingStaticBuffers = 0;
 853             ossdev->ds_caps.dwMaxHwMixingStreamingBuffers = 16;
 854 
 855             ossdev->ds_caps.dwFreeHwMixingAllBuffers = 16;
 856             ossdev->ds_caps.dwFreeHwMixingStaticBuffers = 0;
 857             ossdev->ds_caps.dwFreeHwMixingStreamingBuffers = 16;
 858         }
 859 #endif 

The value provided by winealsa in DSCAPS is all zero, so dxdiag only play with
software buffers and does not play with hardware buffers.

even when you set hardware accelearion to full ( I am not sure why wine
developer believe that hardware acclearation is related to mmap , may be alsa
's dmix need mmap support )

every sound cards using winealsa/wineoss are still practically remained in
emulated mode  since it just inform all dsound application that there is no
Free HwMixing Streaming Buffers or Hw 3D buffers 

so all dsound application have to use software secondary buffers

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