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session_click.cc

/*
    Copyright (C) 20002 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.

*/

#include <list>
#include <cerrno>

#include <ardour/ardour.h>
#include <ardour/session.h>
#include <ardour/tempo.h>
#include <ardour/io.h>

#include <sndfile.h>

#include "i18n.h"

using namespace std;
using namespace ARDOUR;
using namespace PBD;

Pool Session::Click::pool ("click", sizeof (Click), 128);

void
Session::click (nframes_t start, nframes_t nframes)
{
      TempoMap::BBTPointList *points;
      nframes_t end;
      Sample *buf;
      vector<Sample*> bufs;

      if (_click_io == 0) {
            return;
      }

      Glib::RWLock::WriterLock clickm (click_lock, Glib::TRY_LOCK);
      
      if (!clickm.locked() || _transport_speed != 1.0 || !_clicking || click_data == 0) {
            _click_io->silence (nframes);
            return;
      } 

      end = start + nframes;

      buf = _passthru_buffers[0];
      points = _tempo_map->get_points (start, end);

      if (points == 0) {
            goto run_clicks;
      }

      if (!points->empty()) {

            for (TempoMap::BBTPointList::iterator i = points->begin(); i != points->end(); ++i) {
                  switch ((*i).type) {
                  case TempoMap::Beat:
                        if (click_emphasis_data == 0 || (click_emphasis_data && (*i).beat != 1)) {
                              clicks.push_back (new Click ((*i).frame, click_length, click_data));
                        }
                        break;
                        
                  case TempoMap::Bar:
                        if (click_emphasis_data) {
                              clicks.push_back (new Click ((*i).frame, click_emphasis_length, click_emphasis_data));
                        } 
                        break;
                  }
            }
      }
      
      delete points;
      
  run_clicks:
      
      memset (buf, 0, sizeof (Sample) * nframes);

      for (list<Click*>::iterator i = clicks.begin(); i != clicks.end(); ) {

            nframes_t copy;
            nframes_t internal_offset;
            Click *clk;
            list<Click*>::iterator next;

            clk = *i;
            next = i;
            ++next;
      
            if (clk->start < start) {
                  internal_offset = 0;
            } else {
                  internal_offset = clk->start - start;
            }

            if (nframes < internal_offset) {
                     /* we've just located or something.. 
                      effectively going backwards.
                      lets get the flock out of here */
                    break;
            }

            copy = min (clk->duration - clk->offset, nframes - internal_offset);

            memcpy (buf + internal_offset, &clk->data[clk->offset], copy * sizeof (Sample));

            clk->offset += copy;

            if (clk->offset >= clk->duration) {
                  delete clk;
                  clicks.erase (i);
            }


            i = next;
      }

      _click_io->deliver_output (_passthru_buffers, 1, nframes);
}

void
Session::setup_click_sounds (int which)
{
      SNDFILE *sndfile;
      SF_INFO info;

      clear_clicks();

      if ((which == 0 || which == 1)) {
            
            if (click_data && click_data != default_click) {
                  delete [] click_data;
                  click_data = 0;
            }

            string path = Config->get_click_sound();

            if (path.empty()) {

                  click_data = const_cast<Sample*> (default_click);
                  click_length = default_click_length;

            } else {

                  if ((sndfile = sf_open (path.c_str(), SFM_READ, &info)) == 0) {
                        char errbuf[256];
                        sf_error_str (0, errbuf, sizeof (errbuf) - 1);
                        warning << string_compose (_("cannot open click soundfile %1 (%2)"), path, errbuf) << endmsg;
                        _clicking = false;
                        return;
                  }
                  
                  click_data = new Sample[info.frames];
                  click_length = info.frames;
                  
                  if (sf_read_float (sndfile, click_data, info.frames) != info.frames) {
                        warning << _("cannot read data from click soundfile") << endmsg;              
                        delete click_data;
                        click_data = 0;
                        _clicking = false;
                  }
                  
                  sf_close (sndfile);

            }
      }
            
      if ((which == 0 || which == -1)) {

            if (click_emphasis_data && click_emphasis_data != default_click_emphasis) {
                  delete [] click_emphasis_data;
                  click_emphasis_data = 0;
            }

            string path = Config->get_click_emphasis_sound();

            if (path.empty()) {
                  click_emphasis_data = const_cast<Sample*> (default_click_emphasis);
                  click_emphasis_length = default_click_emphasis_length;
            } else {
                  if ((sndfile = sf_open (path.c_str(), SFM_READ, &info)) == 0) {
                        char errbuf[256];
                        sf_error_str (0, errbuf, sizeof (errbuf) - 1);
                        warning << string_compose (_("cannot open click emphasis soundfile %1 (%2)"), path, errbuf) << endmsg;
                        return;
                  }
                  
                  click_emphasis_data = new Sample[info.frames];
                  click_emphasis_length = info.frames;
                  
                  if (sf_read_float (sndfile, click_emphasis_data, info.frames) != info.frames) {
                        warning << _("cannot read data from click emphasis soundfile") << endmsg;                 
                        delete click_emphasis_data;
                        click_emphasis_data = 0;
                  }
                  
                  sf_close (sndfile);
            }
      }
}           

void
Session::clear_clicks ()
{
      Glib::RWLock::WriterLock lm (click_lock);

      for (Clicks::iterator i = clicks.begin(); i != clicks.end(); ++i) {
            delete *i;
      }

      clicks.clear ();
}

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