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shinypixel

Is OpenAL still active for the PC?

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Is OpenAL still active for the PC? I read there were some changes over time. It sounds ideal for what I'm doing, but I'm confused on its current state.

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The interesting part of OpenAL is: If you are using OpenAL for Windows, it does use DirectSound.

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The interesting part of OpenAL is: If you are using OpenAL for Windows, it does use DirectSound.

 

Which is however not very "interesting" as of Windows Vista and later, since DirectSound is now a pure software emulation.

 

OpenAL is merely an API that lets you define some parameters (like sound sources and their position in space). The implementation then does some rather involved reverbing calculations, and lastly forwards two completely mixed stereo channels (or 6 or 8 channels in the case of 5.1 or 7.1) to some operating-system API that throws the digital bits to the speaker. The OS doesn't do anything special, and there is no special hardware required or involved.

 

Also, OpenAL does not necessarily use DirectSound, it is not specified what output it must use. OpenAL Soft has for example configurable (both at compile-time and runtime) outputs, including DirectSound and WinMM, and even writing sound output to a WAV file (not very useful, but still pretty cool). This allows you to run programs that use OpenAL even on old computers where DirectSound is not available.

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Out of curiosity, I had a look at OpenAL Soft. Looking at the examples they provide it seems to be quite different than regular OpenAl and I could not find any documentation on the extensions.

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Not sure if you care about these platforms, but OpenAL is still supported on UNIX flavours.

 

- iOS: Works really well, although there's a bug in Apple's implementation that only happens on iOS 7.  Sadly, I haven't been able to track down.

- MacOSX: Supported, however, the default OpenAL framework just wouldn't work in 64-bit mode.  To get around this, I use OpenAL-Soft instead.

- Android: My experience with OpenAL-Soft on Android hasn't been too great so far.  Audio latency and bugs are issues in my game.

- Linux: I honestly don't know enough about OpenAL on Linux, but I assume you might be able to have hardware level support on this OS still.  Don't quote me on that though.

- Blackberry (QNX): No problems yet.

 

I really miss the days where my NV based onboard audio would fully accelerate OpenAL and EAX.  But quite frankly, I'm quite satisfied with OpenAL-Soft.  The ability to write custom reverb effects is really great.  Although I haven't found much in terms of C/C++ tutorials on this, I've only been able to find delphi and C# (easy translation).

 

http://www.noeska.com/doal/lesson17.aspx (Delphi; easily translated).

http://guildofwriters.org/wiki/Adding_echos_to_sounds (audio presets for EFX).

 

I hope this helps.

 

Shogun.

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