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