AUD_ChannelMapperReader.h

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/*
 * ***** BEGIN GPL LICENSE BLOCK *****
 *
 * Copyright 2009-2011 Jörg Hermann Müller
 *
 * This file is part of AudaSpace.
 *
 * Audaspace is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * AudaSpace is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Audaspace; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 *
 * ***** END GPL LICENSE BLOCK *****
 */

#ifndef AUD_CHANNELMAPPERREADER
#define AUD_CHANNELMAPPERREADER

#include "AUD_EffectReader.h"
#include "AUD_Buffer.h"

class AUD_ChannelMapperReader : public AUD_EffectReader
{
private:
    AUD_Buffer m_buffer;

    AUD_Channels m_target_channels;

    AUD_Channels m_source_channels;

    float* m_mapping;

    int m_map_size;

    float m_mono_angle;

    static const AUD_Channel MONO_MAP[];
    static const AUD_Channel STEREO_MAP[];
    static const AUD_Channel STEREO_LFE_MAP[];
    static const AUD_Channel SURROUND4_MAP[];
    static const AUD_Channel SURROUND5_MAP[];
    static const AUD_Channel SURROUND51_MAP[];
    static const AUD_Channel SURROUND61_MAP[];
    static const AUD_Channel SURROUND71_MAP[];
    static const AUD_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[];

    // hide copy constructor and operator=
    AUD_ChannelMapperReader(const AUD_ChannelMapperReader&);
    AUD_ChannelMapperReader& operator=(const AUD_ChannelMapperReader&);

    void calculateMapping();

    float angleDistance(float alpha, float beta);

public:
    AUD_ChannelMapperReader(AUD_Reference<AUD_IReader> reader, AUD_Channels channels);

    ~AUD_ChannelMapperReader();

    void setChannels(AUD_Channels channels);

    void setMonoAngle(float angle);

    virtual AUD_Specs getSpecs() const;
    virtual void read(int& length, bool& eos, sample_t* buffer);
};

#endif //AUD_CHANNELMAPPERREADER