buffer_crossfader.h

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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_