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/*
Copyright 2018 Google Inc. All Rights Reserved.
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 "utils/sum_and_difference_processor.h"
#include "base/constants_and_types.h"
#include "base/logging.h"
namespace vraudio {
SumAndDifferenceProcessor::SumAndDifferenceProcessor(size_t num_frames)
: temp_buffer_(kNumMonoChannels, num_frames) {}
void SumAndDifferenceProcessor::Process(AudioBuffer* stereo_buffer) {
DCHECK_EQ(stereo_buffer->num_channels(), kNumStereoChannels);
AudioBuffer::Channel* temp_channel = &temp_buffer_[0];
// channel_1' = channel_1 + channel_2;
// channel_2' = channel_1 - channel_2;
*temp_channel = (*stereo_buffer)[0];
*temp_channel -= (*stereo_buffer)[1];
(*stereo_buffer)[0] += (*stereo_buffer)[1];
(*stereo_buffer)[1] = *temp_channel;
}
} // namespace vraudio
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