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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.
*/
#ifndef RESONANCE_AUDIO_UTILS_BUFFER_CROSSFADER_H_
#define RESONANCE_AUDIO_UTILS_BUFFER_CROSSFADER_H_
#include "base/audio_buffer.h"
namespace vraudio {
// Class that takes two input buffers and produces an output buffer by applying
// linear crossfade between the inputs.
class BufferCrossfader {
public:
explicit BufferCrossfader(size_t num_frames);
// Applies linear crossfade for given input buffers and stores the result in
// |output| buffer. Note that, in-place processing is *not* supported by this
// method, the output buffer must be different than the input buffers.
//
// @param input_fade_in Input buffer to fade-in to.
// @param input_fade_out Input buffer to fade-out from.
// @param output Output buffer to store the crossfaded result.
void ApplyLinearCrossfade(const AudioBuffer& input_fade_in,
const AudioBuffer& input_fade_out,
AudioBuffer* output) const;
private:
// Stereo audio buffer to store crossfade decay and growth multipliers.
AudioBuffer crossfade_buffer_;
};
} // namespace vraudio
#endif // RESONANCE_AUDIO_UTILS_BUFFER_CROSSFADER_H_
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