audiofile.hpp

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/*****************************************************************************
    NumeRe: Framework fuer Numerische Rechnungen
    Copyright (C) 2021  Erik Haenel et al.
 
    This program 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 3 of the License, or
    (at your option) any later version.
 
    This program 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 this program.  If not, see <http://www.gnu.org/licenses/>.
******************************************************************************/
 
#ifndef AUDIOFILE_HPP
#define AUDIOFILE_HPP
 
#include <vector>
#include <string>
#include <cmath>
 
namespace Audio
{
    struct Sample
    {
        double leftOrMono;
        double right;
 
        Sample(double _mono) : leftOrMono(_mono), right(NAN) {}
        Sample(double _left, double _right) : leftOrMono(_left), right(_right) {}
    };
 
 
    class File
    {
        public:
            File() {}
            virtual ~File() {}
 
            virtual bool isValid() const = 0;
 
            virtual void newFile() = 0;
            virtual void setChannels(size_t channels) = 0;
            virtual void setSampleRate(size_t freq) = 0;
            virtual void write(const Sample& frame) = 0;
 
            virtual size_t getChannels() const = 0;
            virtual size_t getSampleRate() const = 0;
            virtual size_t getLength() const = 0;
            virtual Sample read() const = 0;
 
            virtual bool isSeekable() const
            {
                return false;
            }
    };
 
 
    class SeekableFile : public File
    {
        public:
            SeekableFile() {}
 
            virtual bool isSeekable() const override
            {
                return true;
            }
 
            virtual size_t getPosition() const = 0;
            virtual void setPosition(size_t pos) = 0;
 
            virtual std::vector<Sample> readSome(size_t len) const = 0;
            virtual void writeSome(const std::vector<Sample> vFrames) = 0;
    };
 
 
    File* getAudioFileByType(const std::string& sFileName);
}
 
#endif // AUDIOFILE_HPP