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/*
* Copyright (C) 2019 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.
*/
#include <string.h>
#include "wav/WavStreamReader.h"
#include "OneShotSampleSource.h"
namespace iolib {
void OneShotSampleSource::mixAudio(float* outBuff, int numChannels, int32_t numFrames) {
int32_t numSamples = mSampleBuffer->getNumSamples();
int32_t sampleChannels = mSampleBuffer->getProperties().channelCount;
int32_t totalSamplesNeeded = numFrames * numChannels; // Total samples to fill the output buffer
int32_t samplesProcessed = 0;
bool isLoopMode = mIsLoopMode;
while (samplesProcessed < totalSamplesNeeded && mIsPlaying) {
int32_t samplesLeft = numSamples - mCurSampleIndex;
int32_t framesLeft = (totalSamplesNeeded - samplesProcessed) / numChannels;
int32_t numWriteFrames = std::min(framesLeft, samplesLeft / sampleChannels);
if (numWriteFrames > 0) {
const float* data = mSampleBuffer->getSampleData();
if ((sampleChannels == 1) && (numChannels == 1)) {
// MONO output from MONO samples
for (int32_t frameIndex = 0; frameIndex < numWriteFrames; frameIndex++) {
outBuff[samplesProcessed + frameIndex] += data[mCurSampleIndex++] * mGain;
}
} else if ((sampleChannels == 1) && (numChannels == 2)) {
// STEREO output from MONO samples
int dstSampleIndex = samplesProcessed;
for (int32_t frameIndex = 0; frameIndex < numWriteFrames; frameIndex++) {
outBuff[dstSampleIndex++] += data[mCurSampleIndex] * mLeftGain;
outBuff[dstSampleIndex++] += data[mCurSampleIndex++] * mRightGain;
}
} else if ((sampleChannels == 2) && (numChannels == 1)) {
// MONO output from STEREO samples
int dstSampleIndex = samplesProcessed;
for (int32_t frameIndex = 0; frameIndex < numWriteFrames; frameIndex++) {
outBuff[dstSampleIndex++] += data[mCurSampleIndex++] * mLeftGain +
data[mCurSampleIndex++] * mRightGain;
}
} else if ((sampleChannels == 2) && (numChannels == 2)) {
// STEREO output from STEREO samples
int dstSampleIndex = samplesProcessed;
for (int32_t frameIndex = 0; frameIndex < numWriteFrames; frameIndex++) {
outBuff[dstSampleIndex++] += data[mCurSampleIndex++] * mLeftGain;
outBuff[dstSampleIndex++] += data[mCurSampleIndex++] * mRightGain;
}
}
samplesProcessed += numWriteFrames * numChannels;
if (mCurSampleIndex >= numSamples) {
if (isLoopMode) {
mCurSampleIndex = 0;
} else {
mIsPlaying = false;
}
}
} else {
break; // No more samples to write in the current chunk
}
}
}
} // namespace wavlib
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