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Fixed compiler warning

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Fixed compiler warnings

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I guess I don't have to mention that, but ALSA_WaitAudio() is
pure evil, and just broken. getpid() returns pids, not tids. You get
those via gettid(). But I'd recommend dropping that entirely. It's
just broken.

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In ALSA_PlayAudio() it is a good idea to use snd_pcm_recover() instead
of checking for the error codes yourself.

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In ALSA_OpenAudio(): instead of setting period_size+n_periods OR
buffer_size I'd recommend copying the hwparams stuff before you do
this, then first try period_size+n_periods, and then apply it with
snd_pcm_hw_params() and check if that works. If it didn't you should
take the copy of hwparams and try setting buffer_size and apply that
via snd_pcm_hw_params() and check if that worked. And if that failed
too, then take the copy and don't apply neither period nor buffer
settings and see if that works.

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There's a bug with gcc 4.4.1 and -O2 where srcp doesn't get the correct value after the first scanline.  Ugh.

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 Ludwig Nussel      2009-10-18 06:31:52 PDT

an mprotect call was added to fix bug 528. However that results in a buffer
that allows writing and code execution. Ie the no-execute security features of
modern operating systems are defeated this way. Two mprotect calls are needed.
One to make the buffer executable but not writeable when done and another one
to make the buffer writeable again if the content needs to be changed.

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 Ludwig Nussel      2009-10-18 05:34:18 PDT

src/joystick/linux/SDL_sysjoystick.c has some problems:

- test_bit() might break with strict aliasing
- test_bit() assumes array is Uint32 but its actually "unsigned long"
  on 64bit systems sizeof(long) != sizeof(Uint32).
- the keybit array is too small
- the arrays are unitialized so the number of
  detected buttons is quite random

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This was a silly bug. :)

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For some people setting the period size works better (and is what SDL 1.2.13 did), but for most people it's the same or worse.  You can use an environment variable to pick which one you want.

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actually, please don't apply this upstream.  i need to think about
a better solution..

thanks.

.mrg.

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Fix assertion triggered in pulsaudio by returning "unknown" instead
of NULL pointer when guessing application name.

- Use getprogname on NetBSD as it wont return NULL

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Look for libGL.so, not any particular libGL.so.<X>, on NetBSD.
(the comment inline explains why)

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Apply patch to first unlock the CD before trying to eject it. Since
SDL doesn't seem to have lock/unlock primitives, this looks like the
right thing to do.

Fixes audio/tcd's eject function too.

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I am using a headset on my monitor as primary sound output device. From time to
time it happens that I switch off my monitor when I leave my computer and
switch it on when I come back.
When doing so while wesnoth is running I get no sound back when I switch on my
monitor. There is probably good reason for that. Therefore I wanted to exit and
restart wesnoth. Unfortunately, wesnoth always hangs in this situation. It
looks like wesnoth can not be exited when the primary sound device vanished.
I created a backtrace of this situation (please see attachment).

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Use the plug: ALSA devices for surround sound formats, which have automatic sample format/rate conversion.
Based on feedback from the ALSA development mailing list:
http://mailman.alsa-project.org/pipermail/alsa-devel/2009-October/022267.html

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Switched from setting the period size and count to setting the buffer size directly, based on feedback from the ALSA development list:
http://mailman.alsa-project.org/pipermail/alsa-devel/2009-October/022267.html

This has the nice side effect of reducing latency on my SBLive! card.

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ALSA's idea of a "frame" is the same as SDL's idea of a "sample".  The frame is a single sample on a single channel, and we've defined the frames for each channel as being interleaved.

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Passed a meaningful value to snd_pcm_sw_params_set_start_threshold()

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On recent distributions ALSA pipes streams through PulseAudio anyway, so using PulseAudio first when it's available will improve latency and reduce ALSA configuration quirks.

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Apparently ALSA says "frames" but it means samples...you don't split this into
 groups by number of channels.

The adventure continues.

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