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: 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 streamIndex for marking stream variables in systrace 37 * @param fifo to read from 38 * @param allowUnderflow if true then allow mixer to advance read index past the write index 39 * @return frames read from this stream 40 */ 41 int32_t mix(int streamIndex, android::FifoBuffer *fifo, bool allowUnderflow); 42 43 float *getOutputBuffer(); 44 45 int32_t getFramesPerBurst() const { return mFramesPerBurst; } 46 47 private: 48 void mixPart(float *destination, float *source, int32_t numFrames); 49 50 float *mOutputBuffer = nullptr; 51 int32_t mSamplesPerFrame = 0; 52 int32_t mFramesPerBurst = 0; 53 int32_t mBufferSizeInBytes = 0; 54 }; 55 56 #endif //AAUDIO_AAUDIO_MIXER_H 57
