/* audio/OutputMixer.h
 *
 * This file is part of AFV-Native.
 *
 * Copyright (c) 2019 Christopher Collins
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice,
 *    this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright notice,
 *    this list of conditions and the following disclaimer in the documentation
 *    and/or other materials provided with the distribution.
 *
 * 3. Neither the name of the copyright holder nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
*/

#ifndef AFV_NATIVE_OUTPUTMIXER_H
#define AFV_NATIVE_OUTPUTMIXER_H

#include <forward_list>
#include <memory>

#include "afv-native/utility.h"
#include "afv-native/audio/ISampleSource.h"
#include "afv-native/audio/SourceStatus.h"

namespace afv_native {
    namespace audio {
        struct MixerSource {
            std::shared_ptr<ISampleSource> src;
            float gain;
        };

        class OutputMixer: public ISampleSource {
        protected:
            std::forward_list<MixerSource> mSources;
            float mGain;
        public:
            OutputMixer();
            virtual ~OutputMixer();

            void setSource(const std::shared_ptr<ISampleSource> &src, float gain);
            void removeSource(const std::shared_ptr<ISampleSource> &src);

            void setGain(float newGain);

            SourceStatus getAudioFrame(SampleType * RESTRICT bufferOut) override;
        };
    }
}

#endif //AFV_NATIVE_OUTPUTMIXER_H
