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36 lines
1.4 KiB
Markdown
36 lines
1.4 KiB
Markdown
LiveEffect Sample
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============
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This sample simply loops audio from input stream to output stream to demonstrate
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the usage of the 2 stream interfaces.
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Screenshots
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-----------
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### Stream Configurations
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- 48kHz
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- oboe::I16
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- stereo or mono
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### Customizing the App
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If you want to customize the effects processing then modify the
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onBothStreamsReady() method in "src/main/cpp/FullDuplexPass.h"
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### Caveats
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OpenES SL does not allow setting the recording or playback device.
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Synchronizing input and output streams for full-duplex operation is tricky.
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Input and output have different startup times. The input side may have to charge up the microphone circuit.
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Also the initial timing for the output callback may be bursty as it fills the buffer up.
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So when the output stream makes its first callback, the input buffer may be overflowing or empty or partially full.
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In order to get into sync we go through a few phases.
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* 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.
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* 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.
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* 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.
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