1 /* 2 * Copyright 2022 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 #ifndef SIMPLE_NOISE_MAKER_H 18 #define SIMPLE_NOISE_MAKER_H 19 20 #include "oboe/Oboe.h" 21 22 /** 23 * Play white noise using Oboe. 24 */ 25 class SimpleNoiseMaker { 26 public: 27 28 /** 29 * Open an Oboe stream. 30 * @return OK or negative error code. 31 */ 32 oboe::Result open(); 33 34 oboe::Result start(); 35 36 oboe::Result stop(); 37 38 oboe::Result close(); 39 40 private: 41 42 class MyDataCallback : public oboe::AudioStreamDataCallback { 43 public: 44 oboe::DataCallbackResult onAudioReady( 45 oboe::AudioStream *audioStream, 46 void *audioData, 47 int32_t numFrames) override; 48 49 }; 50 51 class MyErrorCallback : public oboe::AudioStreamErrorCallback { 52 public: MyErrorCallback(SimpleNoiseMaker * parent)53 MyErrorCallback(SimpleNoiseMaker *parent) : mParent(parent) {} 54 ~MyErrorCallback()55 virtual ~MyErrorCallback() { 56 } 57 58 void onErrorAfterClose(oboe::AudioStream *oboeStream, oboe::Result error) override; 59 60 private: 61 SimpleNoiseMaker *mParent; 62 }; 63 64 std::shared_ptr<oboe::AudioStream> mStream; 65 std::shared_ptr<MyDataCallback> mDataCallback; 66 std::shared_ptr<MyErrorCallback> mErrorCallback; 67 68 static constexpr int kChannelCount = 2; 69 }; 70 71 #endif //SIMPLE_NOISE_MAKER_H 72