(07-02-2016, 03:38 PM)Jhonn Wrote: You're missing the point. OpenAL backend have an implementation of DPL2 decoder, so, by using it with DSP LLE you should be able to send 5.1 audio to the sound card. All other scenarios will (or at least should) just output the raw 2.0 DPL encoded audio from the game, in those cases you would need to route that analog audio to an external receiver capable of decoding DPL2 to get 5.1 sound...
Have you actually tried it yourself and tested the output?
Load Super Mario Sunshine and go to the options screen before loading a save file. There is a surround sound test there. When surround sound is working properly, you can hear the drumbeats alternating between front and back speakers with left and right side beats.
There are only two ways to get surround sound from Dolphin and one of them is broken:
1. Any backend with LLE, and setting computer to output 2.0 sound: the DSP is emulated more faithfully and a DPLII encoded signal is sent for external decoding by an a/v receiver or similar hardware
2. OpenAL LLE with DPLII decoding in dolphin itself and setting computer to output 5.1 sound: this does send 5.1 channels of audio signals but they are not properly mixed so it doesn't sound right.
No backend options with HLE will send neither 5.1 decoded audio nor 2.0 DPLII encoded audio. Also, as mentioned before, using #1 above degrades performance too much.
The ideal scenario would be to have surround sound decoding working with HLE to avoid the performance penalty, and so that the computer doesn't have to be set to 2.0 channel output just when playing dolphin.
Maybe I'm the only one interested in this but the DPLII decoding feature is certainly not working.
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