1*05767d91SRobert WuLiveEffect Sample 2*05767d91SRobert Wu============ 3*05767d91SRobert Wu 4*05767d91SRobert WuThis sample simply loops audio from input stream to output stream to demonstrate 5*05767d91SRobert Wuthe usage of the 2 stream interfaces. 6*05767d91SRobert Wu 7*05767d91SRobert WuScreenshots 8*05767d91SRobert Wu----------- 9*05767d91SRobert Wu 10*05767d91SRobert Wu 11*05767d91SRobert Wu 12*05767d91SRobert Wu 13*05767d91SRobert Wu### Stream Configurations 14*05767d91SRobert Wu- 48kHz 15*05767d91SRobert Wu- oboe::I16 16*05767d91SRobert Wu- stereo or mono 17*05767d91SRobert Wu 18*05767d91SRobert Wu### Customizing the App 19*05767d91SRobert Wu 20*05767d91SRobert WuIf you want to customize the effects processing then modify the 21*05767d91SRobert WuonBothStreamsReady() method in "src/main/cpp/FullDuplexPass.h" 22*05767d91SRobert Wu 23*05767d91SRobert Wu### Caveats 24*05767d91SRobert WuOpenES SL does not allow setting the recording or playback device. 25*05767d91SRobert Wu 26*05767d91SRobert WuSynchronizing input and output streams for full-duplex operation is tricky. 27*05767d91SRobert Wu 28*05767d91SRobert WuInput and output have different startup times. The input side may have to charge up the microphone circuit. 29*05767d91SRobert WuAlso the initial timing for the output callback may be bursty as it fills the buffer up. 30*05767d91SRobert WuSo when the output stream makes its first callback, the input buffer may be overflowing or empty or partially full. 31*05767d91SRobert Wu 32*05767d91SRobert WuIn order to get into sync we go through a few phases. 33*05767d91SRobert Wu 34*05767d91SRobert Wu* In Phase 1 we always drain the input buffer as much as possible, more than the output callback asks for. When we have done this for a while, we move to phase 2. 35*05767d91SRobert Wu* In Phase 2 we optionally skip reading the input once to allow it to fill up with one burst. This makes it less likely to underflow on future reads. 36*05767d91SRobert Wu* In Phase 3 we should be in a stable situation where the output is nearly full and the input is nearly empty. You should be able to run for hours like this with no glitches. 37
