| /* |
| * Copyright (C) 2017 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. |
| */ |
| |
| #ifndef AAUDIO_AAUDIO_MIXER_H |
| #define AAUDIO_AAUDIO_MIXER_H |
| |
| #include <stdint.h> |
| |
| #include <aaudio/AAudio.h> |
| #include <fifo/FifoBuffer.h> |
| |
| class AAudioMixer { |
| public: |
| AAudioMixer() {} |
| ~AAudioMixer(); |
| |
| void allocate(int32_t samplesPerFrame, int32_t framesPerBurst); |
| |
| void clear(); |
| |
| /** |
| * Mix from this FIFO |
| * @param streamIndex for marking stream variables in systrace |
| * @param fifo to read from |
| * @param allowUnderflow if true then allow mixer to advance read index past the write index |
| * @return frames read from this stream |
| */ |
| int32_t mix(int streamIndex, android::FifoBuffer *fifo, bool allowUnderflow); |
| |
| float *getOutputBuffer(); |
| |
| int32_t getFramesPerBurst() const { return mFramesPerBurst; } |
| |
| private: |
| void mixPart(float *destination, float *source, int32_t numFrames); |
| |
| float *mOutputBuffer = nullptr; |
| int32_t mSamplesPerFrame = 0; |
| int32_t mFramesPerBurst = 0; |
| int32_t mBufferSizeInBytes = 0; |
| }; |
| |
| #endif //AAUDIO_AAUDIO_MIXER_H |