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46 lines
1.6 KiB
Markdown
46 lines
1.6 KiB
Markdown
Soundboard
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==========
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Do you want to just jam with some digital tunes? Now you can!
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This sample demonstrates how to obtain the lowest latency and optimal computational throughput by:
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1) Leaving Oboe to choose the best default stream properties for the current device
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2) Setting performance mode to LowLatency
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3) Setting sharing mode to Exclusive
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4) Setting the buffer size to 2 bursts
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5) Using the `-Ofast` compiler optimization flag, even when building the `Debug` variant
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The [following article explaining how to debug CPU performance problems](https://medium.com/@donturner/debugging-audio-glitches-on-android-ed10782f9c64) may also be useful when looking at this code.
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Implementation details
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---
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The stream properties are left to Oboe as such the app must output audio data in a format which matches that of the stream.
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Four different formats are supported:
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|Channel count|Format|
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|-------------|------|
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|1 - Mono|16-bit int|
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|2 - Stereo|16-bit int|
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|1 - Mono|Float|
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|2 - Stereo|Float|
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The signal chain for mono streams is:
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SynthSound->Mixer
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For stereo chains a mono to stereo converter is added to the end of the chain:
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SynthSound->Mixer->MonoToStereo
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The compiler optimization flag `-Ofast` can be found in [CMakeLists.txt](CMakeLists.txt).
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Each SynthSound is a series of 5 Oscillators, creating a pleasant sounding note when combined.
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The number of notes depends on the shape of the screen, with G3 being the first note.
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In order to determine whether a note should be played, MusicTileView demonstrates how to keep track of where each finger is.
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Images
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-----------
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