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importable_source.h

/*
    Copyright (C) 2007 Paul Davis 

    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 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., 675 Mass Ave, Cambridge, MA 02139, USA.

*/

#ifndef __ardour_importable_source_h__
#define __ardour_importable_source_h__

#include <sndfile.h>
#include <pbd/failed_constructor.h>
#include <ardour/types.h>

namespace ARDOUR {

class ImportableSource {
public:
      ImportableSource (const std::string& path)
            : in (sf_open (path.c_str(), SFM_READ, &sf_info), sf_close)
      {
            if (!in) throw failed_constructor();
      
      }
      
      virtual ~ImportableSource() {}

      virtual nframes_t read (Sample* buffer, nframes_t nframes) {
            nframes_t per_channel = nframes / sf_info.channels;
            per_channel = sf_readf_float (in.get(), buffer, per_channel);
            return per_channel * sf_info.channels;
      }

      virtual float ratio() const { return 1.0f; }

      uint channels() const { return sf_info.channels; }

      nframes_t length() const { return sf_info.frames; }

      nframes_t samplerate() const { return sf_info.samplerate; }

protected:
      SF_INFO sf_info;
      boost::shared_ptr<SNDFILE> in;
};

}

#endif /* __ardour_importable_source_h__ */

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