[Bug 19901] New: Burg Schreckenstein: OSS HW emulation plays too slow and crashes

[wine-bugs at winehq.org]

http://bugs.winehq.org/show_bug.cgi?id=19901

           Summary: Burg Schreckenstein: OSS HW emulation plays too slow
                    and crashes
           Product: Wine
           Version: 1.1.28
          Platform: PC
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: directx-dsound
        AssignedTo: wine-bugs at winehq.org
        ReportedBy: hoehle at users.sourceforge.net


Often enough, an app works better in HW emulation mode than with acceleration.
With Burg Schreckenstein, the opposite is true: emulation crashes.

OSS HW:    intro music and game play are fine!
OSS emul:  music too slow (125 seconds instead of 63); assertion failure during
game play:
 err:dsound:DSOUND_MixInBuffer length not a multiple of block size, len = 2 or
130, block size = 4
 mixer.c:502: DSOUND_MixInBuffer: Assertion `dsb->buf_mixpos + len <=
dsb->tmp_buffer_len' failed.

ALSA emul: like OSS emul
ALSA HW:   no sound at all, subtitles display too short to be readable, log:
 fixme:dsound:DSOUND_PerformMix Buffering too much! (20480, 0, 0, 4096) [N
times]

Incidentally, the MacOS with its CoreAudio driver behaves like OSS HW emulation
(same 2 symptoms). So fixing this bug might make that app playable on MacOS (as
would implementing HW acceleration for Mac OSX, which is probably harder).

Using Ubuntu Intrepid without PulseAudio, with Intel Corporation
82801FB/FBM/FR/FW/FRW (ICH6 Family) AC'97 Audio Controller (rev 03).

+wave,+dsound,+winmm,+mmaux,+driver,+mixer,+tid logs of both OSS cases are
attached.
Hopefully the comparison side by side will reveal the fault in the logic that
leads to the block size error and subsequent assertion violation.
Indeed, nAvgBytesPerSec and nBlockAlign are different, but why?

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