1 /* 2 * Copyright (C) 2017 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 AAUDIO_AAUDIO_MIXER_H 18 #define AAUDIO_AAUDIO_MIXER_H 19 20 #include <stdint.h> 21 22 #include <aaudio/AAudio.h> 23 #include <fifo/FifoBuffer.h> 24 25 class AAudioMixer { 26 public: AAudioMixer()27 AAudioMixer() {} 28 ~AAudioMixer(); 29 30 void allocate(int32_t samplesPerFrame, int32_t framesPerBurst); 31 32 void clear(); 33 34 /** 35 * Mix from this FIFO 36 * @param fifo 37 * @param volume 38 * @return true if underflowed 39 */ 40 bool mix(android::FifoBuffer *fifo, float volume); 41 42 void mixPart(float *destination, float *source, int32_t numFrames, float volume); 43 44 float *getOutputBuffer(); 45 46 private: 47 float *mOutputBuffer = nullptr; 48 int32_t mSamplesPerFrame = 0; 49 int32_t mFramesPerBurst = 0; 50 int32_t mBufferSizeInBytes = 0; 51 }; 52 53 54 #endif //AAUDIO_AAUDIO_MIXER_H 55