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DirectSound surround effect ?

Started by Mille Jan 21, 2005 at 3:18 AM 1 replies 950+ views

Original Post

Jan 21, 2005 at 3:18 AM

Hey All I'm in the process of coding an audio system which is able of playing standard *.wav files, which is working fine at the moment. But now I would like to support a surround effects – and I’m not sure how this is done. But I have been thinking of using DirectSound 3D buffers to make a surround alike environment like this: 1: create four Direct Sound 3D buffers. 2: using IDirectSound3DBuffer8 to set properties of each sound source. 3: invoke 'Play' an all the 3D buffers .. 4: ...hhmm... Is this a correct approach, or any other suggestions ? Any help is appreciated .. Thanks!

Nik02

Jan 21, 2005 at 4:10 AM

Your method should work quite well. If you want to extract surround data from a 2-channel stream, you should modulate the original data by special "surround matrices" which separate the channels according to the data phase difference and stereo separation (analog Dolby Surround^TM originally worked in this fashion).

Other approach to driving specific speakers: Multi-channel audio format proposal. I haven't been following this technology - last time I saw the doc before this was in the DirectX 7 SDK, published great many years ago. However, it could be useful.

EDIT: It seems that the new SDK also has info on the second approach. See topic "Multichannel and High-Resolution WAV Formats" [smile]

[Edited by - Nik02 on January 21, 2005 5:10:27 AM]

Mille

Jan 21, 2005 at 6:47 AM

Thanks for your good input !!! -> rate up ..

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