1 package com.google.oboe.samples.hellooboe; 2 /* 3 * Copyright 2017 The Android Open Source Project 4 * 5 * Licensed under the Apache License, Version 2.0 (the "License"); 6 * you may not use this file except in compliance with the License. 7 * You may obtain a copy of the License at 8 * 9 * http://www.apache.org/licenses/LICENSE-2.0 10 * 11 * Unless required by applicable law or agreed to in writing, software 12 * distributed under the License is distributed on an "AS IS" BASIS, 13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 14 * See the License for the specific language governing permissions and 15 * limitations under the License. 16 */ 17 18 import android.content.Context; 19 import android.media.AudioManager; 20 import android.os.Build; 21 22 public class PlaybackEngine { 23 // Load native library 24 static { 25 System.loadLibrary("hello-oboe"); 26 } 27 setDefaultStreamValues(Context context)28 static void setDefaultStreamValues(Context context) { 29 if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN_MR1){ 30 AudioManager myAudioMgr = (AudioManager) context.getSystemService(Context.AUDIO_SERVICE); 31 String sampleRateStr = myAudioMgr.getProperty(AudioManager.PROPERTY_OUTPUT_SAMPLE_RATE); 32 int defaultSampleRate = Integer.parseInt(sampleRateStr); 33 String framesPerBurstStr = myAudioMgr.getProperty(AudioManager.PROPERTY_OUTPUT_FRAMES_PER_BUFFER); 34 int defaultFramesPerBurst = Integer.parseInt(framesPerBurstStr); 35 36 setDefaultStreamValues(defaultSampleRate, defaultFramesPerBurst); 37 } 38 } 39 40 41 // Native methods that require audioserver calls and might take several seconds. startEngine(int audioApi, int deviceId, int channelCount)42 static native int startEngine(int audioApi, int deviceId, int channelCount); stopEngine()43 static native int stopEngine(); 44 45 // Native methods that only talk to the native client code. setToneOn(boolean isToneOn)46 static native void setToneOn(boolean isToneOn); setBufferSizeInBursts(int bufferSizeInBursts)47 static native void setBufferSizeInBursts(int bufferSizeInBursts); getCurrentOutputLatencyMillis()48 static native double getCurrentOutputLatencyMillis(); isLatencyDetectionSupported()49 static native boolean isLatencyDetectionSupported(); isAAudioRecommended()50 static native boolean isAAudioRecommended(); setDefaultStreamValues(int sampleRate, int framesPerBurst)51 static native void setDefaultStreamValues(int sampleRate, int framesPerBurst); 52 } 53