samples/LiveEffect/src/main/java/com/google/oboe/samples/liveEffect/LiveEffectEngine.java

package com.google.oboe.samples.liveEffect;
/*
 * Copyright 2018 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

import android.content.Context;
import android.media.AudioManager;
import android.os.Build;

public enum LiveEffectEngine {

    INSTANCE;

    // Load native library
    static {
        System.loadLibrary("liveEffect");
    }

    // Native methods
    static native boolean create();
    static native boolean isAAudioRecommended();
    static native boolean setAPI(int apiType);
    static native boolean setEffectOn(boolean isEffectOn);
    static native void setRecordingDeviceId(int deviceId);
    static native void setPlaybackDeviceId(int deviceId);
    static native void delete();
    static native void native_setDefaultStreamValues(int defaultSampleRate, int defaultFramesPerBurst);

    static void setDefaultStreamValues(Context context) {
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN_MR1){
            AudioManager myAudioMgr = (AudioManager) context.getSystemService(Context.AUDIO_SERVICE);
            String sampleRateStr = myAudioMgr.getProperty(AudioManager.PROPERTY_OUTPUT_SAMPLE_RATE);
            int defaultSampleRate = Integer.parseInt(sampleRateStr);
            String framesPerBurstStr = myAudioMgr.getProperty(AudioManager.PROPERTY_OUTPUT_FRAMES_PER_BUFFER);
            int defaultFramesPerBurst = Integer.parseInt(framesPerBurstStr);

            native_setDefaultStreamValues(defaultSampleRate, defaultFramesPerBurst);
        }
    }
}