SDL: Default audio output rate to 44kHz.

[lordhoto]

As the title suggests this makes SDL ports use a default of 44kHz instead of 22kHz for the audio output rate. GP2X, Symbian, WinCE still use their old default values. This should increase the sound quality for games. This includes the AdLib emulator, but is probably also beneficial for Wintermute games.

For desktop ports it should be no issue to default to 44kHz. The only issue might be lower end ports derived from SDL. This includes MAEMO, Dingux, GPH (only GP2x Wiz), OpenPandora, WebOS, SamsungTV and LinuxMoto (and PS3, but I guess it should be fine). If you are a porter of any of these ports and have an opinion/objection about this change, please drop a line in here. I will wait for a week and merge this (somewhen next sunday) in case no objections have been raised by porters.

[bluegr]

Looks to be a quite small and self-contained change. If there aren't any regressions (especially with the PS3 port), it looks fine

[bgK]

The PS3 port works fine with this change. I was even wondering whether we could go up to 48KHz, since it is the only frequency accepted by the PS3 API. Currently SDL does the conversion.

[lordhoto]

I was even wondering whether we could go up to 48KHz, since it is the only frequency accepted by the PS3 API.

We could think of that. There's no real particular reason to use 44kHz instead of 48kHz. There is some bits which can be confusing to users (like the OPL emulation being sensitive to the output rate and thus comparing with DOSBox is only possible when using the same rate), but that's really really minor. I don't think that's preventing us from going to 48kHz. If you prefer 48kHz for PS3, I'll change it to that.

[lordhoto]

Since there have been no objections I merge this now.