| /* |
| * Copyright 2018 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 RHYTHMGAME_MIXER_H |
| #define RHYTHMGAME_MIXER_H |
| |
| #include <array> |
| #include "IRenderableAudio.h" |
| |
| constexpr int32_t kBufferSize = 192*10; // Temporary buffer is used for mixing |
| constexpr uint8_t kMaxTracks = 100; |
| |
| class Mixer : public IRenderableAudio { |
| |
| public: |
| void renderAudio(float *audioData, int32_t numFrames) { |
| |
| // Zero out the incoming container array |
| memset(audioData, 0, sizeof(float) * numFrames); |
| |
| for (int i = 0; i < mNextFreeTrackIndex; ++i) { |
| mTracks[i]->renderAudio(mixingBuffer, numFrames); |
| |
| for (int j = 0; j < numFrames; ++j) { |
| audioData[j] += mixingBuffer[j]; |
| } |
| } |
| } |
| |
| void addTrack(std::shared_ptr<IRenderableAudio> renderer){ |
| mTracks[mNextFreeTrackIndex++] = renderer; |
| } |
| |
| private: |
| float mixingBuffer[kBufferSize]; |
| std::array<std::shared_ptr<IRenderableAudio>, kMaxTracks> mTracks; |
| uint8_t mNextFreeTrackIndex = 0; |
| }; |
| |
| |
| #endif //RHYTHMGAME_MIXER_H |