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sndfilesource.h

/*
    Copyright (C) 2006 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 __sndfile_source_h__ 
#define __sndfile_source_h__

#include <sndfile.h>

#include <ardour/audiofilesource.h>

namespace ARDOUR {

class SndFileSource : public AudioFileSource {
  public:
      /* constructor to be called for existing external-to-session files */

        SndFileSource (Session&, Glib::ustring path, int chn, Flag flags);

      /* constructor to be called for new in-session files */

      SndFileSource (Session&, Glib::ustring path, SampleFormat samp_format, HeaderFormat hdr_format, nframes_t rate, 
                   Flag flags = SndFileSource::default_writable_flags);
                   
      /* constructor to be called for existing in-session files */
      
      SndFileSource (Session&, const XMLNode&);

      ~SndFileSource ();

      float sample_rate () const;
      int update_header (nframes_t when, struct tm&, time_t);
      int flush_header ();

      nframes_t natural_position () const;

      nframes_t last_capture_start_frame() const;
      void mark_capture_start (nframes_t);
      void mark_capture_end ();
      void clear_capture_marks();

      bool set_destructive (bool yn);

      bool one_of_several_channels () const;

      static void setup_standard_crossfades (nframes_t sample_rate);
      static const AudioFileSource::Flag default_writable_flags;

      static int get_soundfile_info (const Glib::ustring& path, SoundFileInfo& _info, string& error_msg);

  protected:
      void set_header_timeline_position ();

      nframes_t read_unlocked (Sample *dst, nframes_t start, nframes_t cnt) const;
      nframes_t write_unlocked (Sample *dst, nframes_t cnt);

      nframes_t write_float (Sample* data, nframes_t pos, nframes_t cnt);

  private:
      SNDFILE *sf;
      SF_INFO _info;
      SF_BROADCAST_INFO *_broadcast_info;

      void init ();
      int open();
      void close();
      int setup_broadcast_info (nframes_t when, struct tm&, time_t);

      /* destructive */

      static nframes_t xfade_frames;
      static gain_t* out_coefficient;
      static gain_t* in_coefficient;

      bool          _capture_start;
      bool          _capture_end;
      nframes_t      capture_start_frame;
      nframes_t      file_pos; // unit is frames
      nframes_t      xfade_out_count;
      nframes_t      xfade_in_count;
      Sample*        xfade_buf;

      nframes_t crossfade (Sample* data, nframes_t cnt, int dir);
      void set_timeline_position (int64_t);
      nframes_t destructive_write_unlocked (Sample *dst, nframes_t cnt);
      nframes_t nondestructive_write_unlocked (Sample *dst, nframes_t cnt);
      void handle_header_position_change ();

      static int64_t get_timecode_info (SNDFILE* sf, SF_BROADCAST_INFO* binfo, bool& exists);
};

} // namespace ARDOUR

#endif /* __sndfile_source_h__ */


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