sum_and_difference_processor.cc

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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