ChannelMapperReader.h

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/*******************************************************************************
 * Copyright 2009-2016 Jörg Müller
 *
 * 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.
 ******************************************************************************/
 
#pragma once
 
#include "fx/EffectReader.h"
#include "util/Buffer.h"
 
AUD_NAMESPACE_BEGIN
 
class AUD_API ChannelMapperReader : public EffectReader
{
private:
    Buffer m_buffer;
 
    Channels m_target_channels;
 
    Channels m_source_channels;
 
    float* m_mapping;
 
    int m_map_size;
 
    float m_mono_angle;
 
    static const Channel MONO_MAP[];
    static const Channel STEREO_MAP[];
    static const Channel STEREO_LFE_MAP[];
    static const Channel SURROUND4_MAP[];
    static const Channel SURROUND5_MAP[];
    static const Channel SURROUND51_MAP[];
    static const Channel SURROUND61_MAP[];
    static const Channel SURROUND71_MAP[];
    static const Channel* CHANNEL_MAPS[];
 
    static const float MONO_ANGLES[];
    static const float STEREO_ANGLES[];
    static const float STEREO_LFE_ANGLES[];
    static const float SURROUND4_ANGLES[];
    static const float SURROUND5_ANGLES[];
    static const float SURROUND51_ANGLES[];
    static const float SURROUND61_ANGLES[];
    static const float SURROUND71_ANGLES[];
    static const float* CHANNEL_ANGLES[];
 
    // delete copy constructor and operator=
    ChannelMapperReader(const ChannelMapperReader&) = delete;
    ChannelMapperReader& operator=(const ChannelMapperReader&) = delete;
 
    void AUD_LOCAL calculateMapping();
 
    float AUD_LOCAL angleDistance(float alpha, float beta);
 
public:
    ChannelMapperReader(std::shared_ptr<IReader> reader, Channels channels);
 
    ~ChannelMapperReader();
 
    Channels getSourceChannels() const;
 
    Channels getChannels() const;
 
    void setChannels(Channels channels);
 
    float getMapping(int source, int target);
 
    void setMonoAngle(float angle);
 
    virtual Specs getSpecs() const;
    virtual void read(int& length, bool& eos, sample_t* buffer);
};
 
AUD_NAMESPACE_END