Dolby Pro Logic II & Bitstreaming

[Gir]

They are many Gamecube & Wii games that support Dolby Pro Logic II and it does work over HDMI connected to an AV Receiver,   by making sure the audio device is set to Stereo,  the Audio Backend should be WASAPI (Exclusive Mode) and Pro Logic is set on the AV Receiver.  

Star Wars Rogue Squadron II as a Dolby Pro Logic demo for testing. 

I noticed that the Xbox One and PS3 have the ability to bitstream audio to the receiver from games and videos, this is also possible on the PC using the AC3 Filter with video files, is this possible with Dolphin?  

[Gir]

I was wondering, does anyone still use a dedicated Sound Card, I used to purchase them back in the day but now i use HDMI Audio, so does this mean the GPU does the audio processing or is it all on the CPU, thus HDMI Audio uses up CPU Cycle and is this
inferior to dedicated Sound cards?

Does Bitsteaming mean the AV Receiver does all the audio processing freeing up CPU Cycles?

[AnyOldName3]

Basically everything uses CPU audio these days - back when Vista was new, Microsoft realised a huge percentage of random BSODs were caused by badly written sound card drivers, and so made all the Windows sound APIs use a software implementation by default.

[skid]

(10-13-2018, 08:10 AM)Gir Wrote: does this mean the GPU does the audio processing or is it all on the CPU,  thus HDMI Audio uses up CPU Cycle and is this inferior to dedicated Sound cards?

HDMI Audio is bitstreaming, so it is the AV Receiver that is performing the audio processing, not the GPU nor the CPU.

(10-13-2018, 08:10 AM)Gir Wrote: Does Bitsteaming mean the AV Receiver does all the audio processing freeing up CPU Cycles?

Yes. Remember also that the GameCube has a DSP which performs audio processing before the audio passes through HDMI Audio. This is emulated by Dolphin using the CPU and cannot be disabled.

(10-13-2018, 08:10 AM)Gir Wrote: on the PC using the AC3 Filter with video files, is this possible with Dolphin?

The equivalent of the AC3 Filter is always on in Dolphin.

If you enable the "Dolby Pro Logic II" option in Dolphin, this turns off Bitstreaming and performs the audio processing on your CPU. You would not want this option enabled with your set-up.