Traverso/cvs/traverso/src/audiofileio/encode/AbstractAudioWriter.h

/*
Copyright (C) 2007 Ben Levitt 

This file is part of Traverso

Traverso 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.

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, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA.

*/

#ifndef ABSTRACTAUDIOWRITER_H
#define ABSTRACTAUDIOWRITER_H

#include "defines.h"

class QString;

class AbstractAudioWriter
{
        
public:
        AbstractAudioWriter();
        virtual ~AbstractAudioWriter();
        
        virtual const char* get_extension() = 0;
        
        void set_num_channels(int channels);
        void set_bits_per_sample(int bits);
        void set_rate(int rate);
        virtual bool set_format_attribute(const QString& key, const QString& value);
        nframes_t pos();
        
        bool open(const QString& filename);
        nframes_t write(void* buffer, nframes_t frameCount);
        bool close();
        
        static AbstractAudioWriter* create_audio_writer(const QString& type);
        
protected:
        virtual bool open_private() = 0;
        virtual nframes_t write_private(void* buffer, nframes_t frameCount) = 0;
        virtual bool close_private() = 0;
        
        QString         m_fileName;
        bool            m_isOpen;
        int             m_sampleWidth;
        nframes_t       m_writePos;
        int             m_channels;
        int             m_rate;
};

#endif

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