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fd_midiport.h

/*
    Copyright (C) 1999 Paul Barton-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.

    $Id: fd_midiport.h,v 1.6 2004/06/11 16:08:16 pauld Exp $
*/

#ifndef __fd_midiport_h__
#define __fd_midiport_h__

#include <vector>
#include <string>
#include <cerrno>

#include <cerrno>
#include <fcntl.h>
#include <unistd.h>

#include <midi++/port.h>
#include <midi++/port_request.h>

namespace MIDI {

class FD_MidiPort : public Port

{
  public:
      FD_MidiPort (PortRequest &req, 
                 const std::string &dirpath,
                 const std::string &pattern);

      virtual ~FD_MidiPort () {
            ::close (_fd);
      }

      virtual int selectable() const;
      static std::vector<std::string *> *list_devices ();

  protected:
      int _fd;
      virtual void open (PortRequest &req);

      virtual int write (byte *msg, size_t msglen) {
            int nwritten;
            
            if ((_mode & O_ACCMODE) == O_RDONLY) {
                  return -EACCES;
            }
            
            if (slowdown) {
                  return do_slow_write (msg, msglen);
            }

            if ((nwritten = ::write (_fd, msg, msglen)) > 0) {
                  bytes_written += nwritten;
                  
                  if (output_parser) {
                        output_parser->raw_preparse 
                              (*output_parser, msg, nwritten);
                        for (int i = 0; i < nwritten; i++) {
                              output_parser->scanner (msg[i]);
                        }
                        output_parser->raw_postparse 
                              (*output_parser, msg, nwritten);
                  }
            }
            return nwritten;
      }

      virtual int read (byte *buf, size_t max);

  private:
      static std::string *midi_dirpath;
      static std::string *midi_filename_pattern;

      int do_slow_write (byte *msg, unsigned int msglen);
};

}; /*namespace MIDI */

#endif  // __fd_midiport_h__

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