blob: 97ba349d86ebd3c787ad68d15b4bd13e9e4e4761 [file] [log] [blame]
/*
* 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 SHARED_MONOTOSTEREO_H
#define SHARED_MONOTOSTEREO_H
#include "IRenderableAudio.h"
class MonoToStereo : public IRenderableAudio {
public:
MonoToStereo(IRenderableAudio *input) : mInput(input){};
void renderAudio(float *audioData, int32_t numFrames) override {
constexpr int kChannelCountStereo = 2;
mInput->renderAudio(audioData, numFrames);
// We assume that audioData has sufficient frames to hold the stereo output, so copy each
// frame in the input to the output twice, working our way backwards through the input array
// e.g. 123 => 112233
for (int i = numFrames - 1; i >= 0; --i) {
audioData[i * kChannelCountStereo] = audioData[i];
audioData[i * kChannelCountStereo + 1] = audioData[i];
}
}
IRenderableAudio *mInput;
};
#endif //SHARED_MONOTOSTEREO_H