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silentfilesource.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_silentfilesource_h__ 
#define __ardour_silentfilesource_h__

#include <ardour/audiofilesource.h>

namespace ARDOUR {

class SilentFileSource : public AudioFileSource {
  public:
      virtual ~SilentFileSource ();

      int update_header (nframes_t when, struct tm&, time_t) { return 0; }
      int flush_header () { return 0; }
      float sample_rate () const { return _sample_rate; }

      void set_length (nframes_t len);
      
      bool destructive() const { return false; }
      bool can_be_analysed() const { return false; } 

  protected:

      float         _sample_rate;

      SilentFileSource (Session&, const XMLNode&, nframes_t nframes, float sample_rate);

      friend class SourceFactory;

      nframes_t read_unlocked (Sample *dst, nframes_t start, nframes_t cnt) const {
            memset (dst, 0, sizeof (Sample) * cnt);
            return cnt;
      }

      nframes_t write_unlocked (Sample *dst, nframes_t cnt) { return 0; }

      void set_header_timeline_position () {}

      int read_peaks_with_fpp (PeakData *peaks, nframes_t npeaks, nframes_t start, nframes_t cnt, double samples_per_unit, nframes_t fpp) const {
            memset (peaks, 0, sizeof (PeakData) * npeaks);
            return 0;
      }

};

} // namespace ARDOUR

#endif /* __ardour_audiofilesource_h__ */


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