objective c - iOS Audio Unit, output each stereo channel from stereo source to 3D Mixer -


apple's 3d mixer audio unit guide states:

to use stereo source, may treat left , right channels 2 independent single-channel sources, , feed each side of stereo stream own input bus.

https://developer.apple.com/library/ios/qa/qa1695/_index.html

however, can not figure out how send each channel of stereo audio unit 3d mixer. how 1 this?

bascially, you'll need like

@interface audioengine () {     avaudioengine                       *_engine;     avaudioenvironmentnode              *_environment;     avaudiopcmbuffer                    *_ouputbuffer;     nsmutablearray <avaudioplayernode*> *_playerarray;     avaudioplayernode                   *_soundplayer;     avaudiopcmbuffer                    *_soundbuffer;     bool                                _multichanneloutputenabled

;

load file , grab buffer. split stereo multichannel, need like

outputlayouttag = kaudiochannellayouttag_audiounit_2; _multichanneloutputenabled = true;

this '_multichanneloutputenabled = true;' set false

then setup algorithm channels

avaudio3dmixingrenderingalgorithm renderingthis = _multichanneloutputenabled ?  avaudio3dmixingrenderingalgorithmsoundfield : avaudio3dmixingrenderingalgorithmequalpowerpanning;         newplayer.renderingalgorithm = renderingthis;

somewhere in view controller might have tied object in game

[self.epicaudioengine.updatelistenerorientation:avaudiomake3dangularorientation([ang.x,ang.y,ang.z])  [self updateeuleranglesandlistenerfromdeltax:dx deltay:dy]

look through ffmpeg source code libavformat,libavutil idea of how process audio


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