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Editorial Team
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Asked: 2026-06-10T23:33:49+00:00

I’m porting an audio capture loop from Java (using AudioRecord class) to a native

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I’m porting an audio capture loop from Java (using AudioRecord class) to a native library using OpenSL.

The reason for this is that after profiling, the capture loop is consuming in our test phones around 2% less CPU in OpenSL. That is a significative gain!

The constructor for the Java AudioRecord class receives a source parameter that can be configured to several values (MIC, CAMCORDER, VOICE_DOWNLINK, etc.)

So far, I haven’t been able to find the equivalence (if there exists) for the source parameter in OpenSL.

Does anybody know if there’s a way to specify this Source parameter for the AudioRecorder object?

Cheers!

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  1. Editorial Team

    Check out the functions and constants defined in SLES/OpenSLES_Android.h and SLES/OpenSLES_AndroidConfiguration.h. When you get your recording object from OpenSLES, use GetInterface() to get the interface pointer for SL_IID_ANDROIDCONFIGURATION. From there you can call SetConfiguration() using key SL_ANDROID_KEY_RECORDING_PRESET on the returned SLAndroidConfigurationItf pointer.

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