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
25class AAudioMixer {
26public:
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
46private:
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